]> git.openstreetmap.org Git - rails.git/blobdiff - vendor/assets/iD/iD.js
Update to iD v2.19.3
[rails.git] / vendor / assets / iD / iD.js
index 72e021e610db566a7dff62349e2a07971bac14a3..4d89db7c5aaced0e7ca6315120fc94acb2724ea5 100644 (file)
 (function () {
+
        var commonjsGlobal = typeof globalThis !== 'undefined' ? globalThis : typeof window !== 'undefined' ? window : typeof global !== 'undefined' ? global : typeof self !== 'undefined' ? self : {};
 
+       function getDefaultExportFromCjs (x) {
+               return x && x.__esModule && Object.prototype.hasOwnProperty.call(x, 'default') ? x['default'] : x;
+       }
+
        function createCommonjsModule(fn, basedir, module) {
                return module = {
-                 path: basedir,
-                 exports: {},
-                 require: function (path, base) {
-             return commonjsRequire(path, (base === undefined || base === null) ? module.path : base);
-           }
+                       path: basedir,
+                       exports: {},
+                       require: function (path, base) {
+                               return commonjsRequire(path, (base === undefined || base === null) ? module.path : base);
+                       }
                }, fn(module, module.exports), module.exports;
        }
 
-       function getCjsExportFromNamespace (n) {
-               return n && n['default'] || n;
-       }
-
        function commonjsRequire () {
                throw new Error('Dynamic requires are not currently supported by @rollup/plugin-commonjs');
        }
 
-       var isImplemented = function () {
-               var set, iterator, result;
-               if (typeof Set !== 'function') return false;
-               set = new Set(['raz', 'dwa', 'trzy']);
-               if (String(set) !== '[object Set]') return false;
-               if (set.size !== 3) return false;
-               if (typeof set.add !== 'function') return false;
-               if (typeof set.clear !== 'function') return false;
-               if (typeof set.delete !== 'function') return false;
-               if (typeof set.entries !== 'function') return false;
-               if (typeof set.forEach !== 'function') return false;
-               if (typeof set.has !== 'function') return false;
-               if (typeof set.keys !== 'function') return false;
-               if (typeof set.values !== 'function') return false;
-
-               iterator = set.values();
-               result = iterator.next();
-               if (result.done !== false) return false;
-               if (result.value !== 'raz') return false;
-
-               return true;
+       var check = function (it) {
+         return it && it.Math == Math && it;
        };
 
-       // eslint-disable-next-line no-empty-function
-       var noop = function () {};
-
-       var _undefined = noop(); // Support ES3 engines
+       // https://github.com/zloirock/core-js/issues/86#issuecomment-115759028
+       var global_1 =
+         // eslint-disable-next-line no-undef
+         check(typeof globalThis == 'object' && globalThis) ||
+         check(typeof window == 'object' && window) ||
+         check(typeof self == 'object' && self) ||
+         check(typeof commonjsGlobal == 'object' && commonjsGlobal) ||
+         // eslint-disable-next-line no-new-func
+         Function('return this')();
 
-       var isValue = function (val) { return val !== _undefined && val !== null; };
-
-       var validValue = function (value) {
-               if (!isValue(value)) throw new TypeError("Cannot use null or undefined");
-               return value;
+       var fails = function (exec) {
+         try {
+           return !!exec();
+         } catch (error) {
+           return true;
+         }
        };
 
-       var clear = function () {
-               validValue(this).length = 0;
-               return this;
-       };
+       // Thank's IE8 for his funny defineProperty
+       var descriptors = !fails(function () {
+         return Object.defineProperty({}, 1, { get: function () { return 7; } })[1] != 7;
+       });
 
-       var isImplemented$1 = function () {
-               var numberIsNaN = Number.isNaN;
-               if (typeof numberIsNaN !== "function") return false;
-               return !numberIsNaN({}) && numberIsNaN(NaN) && !numberIsNaN(34);
-       };
+       var nativePropertyIsEnumerable = {}.propertyIsEnumerable;
+       var getOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
 
-       var shim = function (value) {
-               // eslint-disable-next-line no-self-compare
-               return value !== value;
-       };
+       // Nashorn ~ JDK8 bug
+       var NASHORN_BUG = getOwnPropertyDescriptor && !nativePropertyIsEnumerable.call({ 1: 2 }, 1);
 
-       var isNan = isImplemented$1() ? Number.isNaN : shim;
+       // `Object.prototype.propertyIsEnumerable` method implementation
+       // https://tc39.github.io/ecma262/#sec-object.prototype.propertyisenumerable
+       var f = NASHORN_BUG ? function propertyIsEnumerable(V) {
+         var descriptor = getOwnPropertyDescriptor(this, V);
+         return !!descriptor && descriptor.enumerable;
+       } : nativePropertyIsEnumerable;
 
-       var isImplemented$2 = function () {
-               var sign = Math.sign;
-               if (typeof sign !== "function") return false;
-               return sign(10) === 1 && sign(-20) === -1;
+       var objectPropertyIsEnumerable = {
+               f: f
        };
 
-       var shim$1 = function (value) {
-               value = Number(value);
-               if (isNaN(value) || value === 0) return value;
-               return value > 0 ? 1 : -1;
+       var createPropertyDescriptor = function (bitmap, value) {
+         return {
+           enumerable: !(bitmap & 1),
+           configurable: !(bitmap & 2),
+           writable: !(bitmap & 4),
+           value: value
+         };
        };
 
-       var sign = isImplemented$2() ? Math.sign : shim$1;
-
-       var abs   = Math.abs
-         , floor = Math.floor;
+       var toString = {}.toString;
 
-       var toInteger = function (value) {
-               if (isNaN(value)) return 0;
-               value = Number(value);
-               if (value === 0 || !isFinite(value)) return value;
-               return sign(value) * floor(abs(value));
+       var classofRaw = function (it) {
+         return toString.call(it).slice(8, -1);
        };
 
-       var max       = Math.max;
-
-       var toPosInteger = function (value) { return max(0, toInteger(value)); };
-
-       var indexOf           = Array.prototype.indexOf
-         , objHasOwnProperty = Object.prototype.hasOwnProperty
-         , abs$1               = Math.abs
-         , floor$1             = Math.floor;
-
-       var eIndexOf = function (searchElement/*, fromIndex*/) {
-               var i, length, fromIndex, val;
-               if (!isNan(searchElement)) return indexOf.apply(this, arguments);
-
-               length = toPosInteger(validValue(this).length);
-               fromIndex = arguments[1];
-               if (isNaN(fromIndex)) fromIndex = 0;
-               else if (fromIndex >= 0) fromIndex = floor$1(fromIndex);
-               else fromIndex = toPosInteger(this.length) - floor$1(abs$1(fromIndex));
+       var split = ''.split;
 
-               for (i = fromIndex; i < length; ++i) {
-                       if (objHasOwnProperty.call(this, i)) {
-                               val = this[i];
-                               if (isNan(val)) return i; // Jslint: ignore
-                       }
-               }
-               return -1;
-       };
+       // fallback for non-array-like ES3 and non-enumerable old V8 strings
+       var indexedObject = fails(function () {
+         // throws an error in rhino, see https://github.com/mozilla/rhino/issues/346
+         // eslint-disable-next-line no-prototype-builtins
+         return !Object('z').propertyIsEnumerable(0);
+       }) ? function (it) {
+         return classofRaw(it) == 'String' ? split.call(it, '') : Object(it);
+       } : Object;
 
-       var create = Object.create, getPrototypeOf = Object.getPrototypeOf, plainObject = {};
-
-       var isImplemented$3 = function (/* CustomCreate*/) {
-               var setPrototypeOf = Object.setPrototypeOf, customCreate = arguments[0] || create;
-               if (typeof setPrototypeOf !== "function") return false;
-               return getPrototypeOf(setPrototypeOf(customCreate(null), plainObject)) === plainObject;
+       // `RequireObjectCoercible` abstract operation
+       // https://tc39.github.io/ecma262/#sec-requireobjectcoercible
+       var requireObjectCoercible = function (it) {
+         if (it == undefined) throw TypeError("Can't call method on " + it);
+         return it;
        };
 
-       var map = { function: true, object: true };
-
-       var isObject = function (value) { return (isValue(value) && map[typeof value]) || false; };
-
-       var create$1 = Object.create, shim$2;
-
-       if (!isImplemented$3()) {
-               shim$2 = shim$3;
-       }
-
-       var create_1 = (function () {
-               var nullObject, polyProps, desc;
-               if (!shim$2) return create$1;
-               if (shim$2.level !== 1) return create$1;
+       // toObject with fallback for non-array-like ES3 strings
 
-               nullObject = {};
-               polyProps = {};
-               desc = { configurable: false, enumerable: false, writable: true, value: undefined };
-               Object.getOwnPropertyNames(Object.prototype).forEach(function (name) {
-                       if (name === "__proto__") {
-                               polyProps[name] = {
-                                       configurable: true,
-                                       enumerable: false,
-                                       writable: true,
-                                       value: undefined
-                               };
-                               return;
-                       }
-                       polyProps[name] = desc;
-               });
-               Object.defineProperties(nullObject, polyProps);
-
-               Object.defineProperty(shim$2, "nullPolyfill", {
-                       configurable: false,
-                       enumerable: false,
-                       writable: false,
-                       value: nullObject
-               });
-
-               return function (prototype, props) {
-                       return create$1(prototype === null ? nullObject : prototype, props);
-               };
-       })();
 
-       var objIsPrototypeOf = Object.prototype.isPrototypeOf
-         , defineProperty   = Object.defineProperty
-         , nullDesc         = { configurable: true, enumerable: false, writable: true, value: undefined }
-         , validate;
 
-       validate = function (obj, prototype) {
-               validValue(obj);
-               if (prototype === null || isObject(prototype)) return obj;
-               throw new TypeError("Prototype must be null or an object");
+       var toIndexedObject = function (it) {
+         return indexedObject(requireObjectCoercible(it));
        };
 
-       var shim$3 = (function (status) {
-               var fn, set;
-               if (!status) return null;
-               if (status.level === 2) {
-                       if (status.set) {
-                               set = status.set;
-                               fn = function (obj, prototype) {
-                                       set.call(validate(obj, prototype), prototype);
-                                       return obj;
-                               };
-                       } else {
-                               fn = function (obj, prototype) {
-                                       validate(obj, prototype).__proto__ = prototype;
-                                       return obj;
-                               };
-                       }
-               } else {
-                       fn = function self(obj, prototype) {
-                               var isNullBase;
-                               validate(obj, prototype);
-                               isNullBase = objIsPrototypeOf.call(self.nullPolyfill, obj);
-                               if (isNullBase) delete self.nullPolyfill.__proto__;
-                               if (prototype === null) prototype = self.nullPolyfill;
-                               obj.__proto__ = prototype;
-                               if (isNullBase) defineProperty(self.nullPolyfill, "__proto__", nullDesc);
-                               return obj;
-                       };
-               }
-               return Object.defineProperty(fn, "level", {
-                       configurable: false,
-                       enumerable: false,
-                       writable: false,
-                       value: status.level
-               });
-       })(
-               (function () {
-                       var tmpObj1 = Object.create(null)
-                         , tmpObj2 = {}
-                         , set
-                         , desc = Object.getOwnPropertyDescriptor(Object.prototype, "__proto__");
-
-                       if (desc) {
-                               try {
-                                       set = desc.set; // Opera crashes at this point
-                                       set.call(tmpObj1, tmpObj2);
-                               } catch (ignore) {}
-                               if (Object.getPrototypeOf(tmpObj1) === tmpObj2) return { set: set, level: 2 };
-                       }
+       var isObject = function (it) {
+         return typeof it === 'object' ? it !== null : typeof it === 'function';
+       };
 
-                       tmpObj1.__proto__ = tmpObj2;
-                       if (Object.getPrototypeOf(tmpObj1) === tmpObj2) return { level: 2 };
+       // `ToPrimitive` abstract operation
+       // https://tc39.github.io/ecma262/#sec-toprimitive
+       // instead of the ES6 spec version, we didn't implement @@toPrimitive case
+       // and the second argument - flag - preferred type is a string
+       var toPrimitive = function (input, PREFERRED_STRING) {
+         if (!isObject(input)) return input;
+         var fn, val;
+         if (PREFERRED_STRING && typeof (fn = input.toString) == 'function' && !isObject(val = fn.call(input))) return val;
+         if (typeof (fn = input.valueOf) == 'function' && !isObject(val = fn.call(input))) return val;
+         if (!PREFERRED_STRING && typeof (fn = input.toString) == 'function' && !isObject(val = fn.call(input))) return val;
+         throw TypeError("Can't convert object to primitive value");
+       };
 
-                       tmpObj1 = {};
-                       tmpObj1.__proto__ = tmpObj2;
-                       if (Object.getPrototypeOf(tmpObj1) === tmpObj2) return { level: 1 };
+       var hasOwnProperty = {}.hasOwnProperty;
 
-                       return false;
-               })()
-       );
+       var has = function (it, key) {
+         return hasOwnProperty.call(it, key);
+       };
 
-       var setPrototypeOf = isImplemented$3() ? Object.setPrototypeOf : shim$3;
+       var document$1 = global_1.document;
+       // typeof document.createElement is 'object' in old IE
+       var EXISTS = isObject(document$1) && isObject(document$1.createElement);
 
-       var validCallable = function (fn) {
-               if (typeof fn !== "function") throw new TypeError(fn + " is not a function");
-               return fn;
+       var documentCreateElement = function (it) {
+         return EXISTS ? document$1.createElement(it) : {};
        };
 
-       // ES3 safe
-       var _undefined$1 = void 0;
-
-       var is = function (value) { return value !== _undefined$1 && value !== null; };
+       // Thank's IE8 for his funny defineProperty
+       var ie8DomDefine = !descriptors && !fails(function () {
+         return Object.defineProperty(documentCreateElement('div'), 'a', {
+           get: function () { return 7; }
+         }).a != 7;
+       });
 
-       // prettier-ignore
-       var possibleTypes = { "object": true, "function": true, "undefined": true /* document.all */ };
+       var nativeGetOwnPropertyDescriptor = Object.getOwnPropertyDescriptor;
 
-       var is$1 = function (value) {
-               if (!is(value)) return false;
-               return hasOwnProperty.call(possibleTypes, typeof value);
+       // `Object.getOwnPropertyDescriptor` method
+       // https://tc39.github.io/ecma262/#sec-object.getownpropertydescriptor
+       var f$1 = descriptors ? nativeGetOwnPropertyDescriptor : function getOwnPropertyDescriptor(O, P) {
+         O = toIndexedObject(O);
+         P = toPrimitive(P, true);
+         if (ie8DomDefine) try {
+           return nativeGetOwnPropertyDescriptor(O, P);
+         } catch (error) { /* empty */ }
+         if (has(O, P)) return createPropertyDescriptor(!objectPropertyIsEnumerable.f.call(O, P), O[P]);
        };
 
-       var is$2 = function (value) {
-               if (!is$1(value)) return false;
-               try {
-                       if (!value.constructor) return false;
-                       return value.constructor.prototype === value;
-               } catch (error) {
-                       return false;
-               }
+       var objectGetOwnPropertyDescriptor = {
+               f: f$1
        };
 
-       var is$3 = function (value) {
-               if (typeof value !== "function") return false;
-
-               if (!hasOwnProperty.call(value, "length")) return false;
+       var anObject = function (it) {
+         if (!isObject(it)) {
+           throw TypeError(String(it) + ' is not an object');
+         } return it;
+       };
 
-               try {
-                       if (typeof value.length !== "number") return false;
-                       if (typeof value.call !== "function") return false;
-                       if (typeof value.apply !== "function") return false;
-               } catch (error) {
-                       return false;
-               }
+       var nativeDefineProperty = Object.defineProperty;
 
-               return !is$2(value);
+       // `Object.defineProperty` method
+       // https://tc39.github.io/ecma262/#sec-object.defineproperty
+       var f$2 = descriptors ? nativeDefineProperty : function defineProperty(O, P, Attributes) {
+         anObject(O);
+         P = toPrimitive(P, true);
+         anObject(Attributes);
+         if (ie8DomDefine) try {
+           return nativeDefineProperty(O, P, Attributes);
+         } catch (error) { /* empty */ }
+         if ('get' in Attributes || 'set' in Attributes) throw TypeError('Accessors not supported');
+         if ('value' in Attributes) O[P] = Attributes.value;
+         return O;
        };
 
-       var classRe = /^\s*class[\s{/}]/, functionToString = Function.prototype.toString;
-
-       var is$4 = function (value) {
-               if (!is$3(value)) return false;
-               if (classRe.test(functionToString.call(value))) return false;
-               return true;
+       var objectDefineProperty = {
+               f: f$2
        };
 
-       var isImplemented$4 = function () {
-               var assign = Object.assign, obj;
-               if (typeof assign !== "function") return false;
-               obj = { foo: "raz" };
-               assign(obj, { bar: "dwa" }, { trzy: "trzy" });
-               return obj.foo + obj.bar + obj.trzy === "razdwatrzy";
+       var createNonEnumerableProperty = descriptors ? function (object, key, value) {
+         return objectDefineProperty.f(object, key, createPropertyDescriptor(1, value));
+       } : function (object, key, value) {
+         object[key] = value;
+         return object;
        };
 
-       var isImplemented$5 = function () {
-               try {
-                       Object.keys("primitive");
-                       return true;
-               } catch (e) {
-                       return false;
-               }
+       var setGlobal = function (key, value) {
+         try {
+           createNonEnumerableProperty(global_1, key, value);
+         } catch (error) {
+           global_1[key] = value;
+         } return value;
        };
 
-       var keys = Object.keys;
+       var SHARED = '__core-js_shared__';
+       var store = global_1[SHARED] || setGlobal(SHARED, {});
 
-       var shim$4 = function (object) { return keys(isValue(object) ? Object(object) : object); };
+       var sharedStore = store;
 
-       var keys$1 = isImplemented$5() ? Object.keys : shim$4;
+       var functionToString = Function.toString;
 
-       var max$1   = Math.max;
+       // this helper broken in `3.4.1-3.4.4`, so we can't use `shared` helper
+       if (typeof sharedStore.inspectSource != 'function') {
+         sharedStore.inspectSource = function (it) {
+           return functionToString.call(it);
+         };
+       }
 
-       var shim$5 = function (dest, src/*, …srcn*/) {
-               var error, i, length = max$1(arguments.length, 2), assign;
-               dest = Object(validValue(dest));
-               assign = function (key) {
-                       try {
-                               dest[key] = src[key];
-                       } catch (e) {
-                               if (!error) error = e;
-                       }
-               };
-               for (i = 1; i < length; ++i) {
-                       src = arguments[i];
-                       keys$1(src).forEach(assign);
-               }
-               if (error !== undefined) throw error;
-               return dest;
-       };
+       var inspectSource = sharedStore.inspectSource;
 
-       var assign = isImplemented$4() ? Object.assign : shim$5;
+       var WeakMap = global_1.WeakMap;
 
-       var forEach = Array.prototype.forEach, create$2 = Object.create;
+       var nativeWeakMap = typeof WeakMap === 'function' && /native code/.test(inspectSource(WeakMap));
 
-       var process$1 = function (src, obj) {
-               var key;
-               for (key in src) obj[key] = src[key];
-       };
+       var isPure = false;
 
-       // eslint-disable-next-line no-unused-vars
-       var normalizeOptions = function (opts1/*, …options*/) {
-               var result = create$2(null);
-               forEach.call(arguments, function (options) {
-                       if (!isValue(options)) return;
-                       process$1(Object(options), result);
-               });
-               return result;
-       };
+       var shared = createCommonjsModule(function (module) {
+       (module.exports = function (key, value) {
+         return sharedStore[key] || (sharedStore[key] = value !== undefined ? value : {});
+       })('versions', []).push({
+         version: '3.6.5',
+         mode:  'global',
+         copyright: '© 2020 Denis Pushkarev (zloirock.ru)'
+       });
+       });
 
-       var str = "razdwatrzy";
+       var id = 0;
+       var postfix = Math.random();
 
-       var isImplemented$6 = function () {
-               if (typeof str.contains !== "function") return false;
-               return str.contains("dwa") === true && str.contains("foo") === false;
+       var uid = function (key) {
+         return 'Symbol(' + String(key === undefined ? '' : key) + ')_' + (++id + postfix).toString(36);
        };
 
-       var indexOf$1 = String.prototype.indexOf;
+       var keys = shared('keys');
 
-       var shim$6 = function (searchString/*, position*/) {
-               return indexOf$1.call(this, searchString, arguments[1]) > -1;
+       var sharedKey = function (key) {
+         return keys[key] || (keys[key] = uid(key));
        };
 
-       var contains = isImplemented$6() ? String.prototype.contains : shim$6;
-
-       var d_1 = createCommonjsModule(function (module) {
-
+       var hiddenKeys = {};
 
+       var WeakMap$1 = global_1.WeakMap;
+       var set, get, has$1;
 
-       var d = (module.exports = function (dscr, value/*, options*/) {
-               var c, e, w, options, desc;
-               if (arguments.length < 2 || typeof dscr !== "string") {
-                       options = value;
-                       value = dscr;
-                       dscr = null;
-               } else {
-                       options = arguments[2];
-               }
-               if (is(dscr)) {
-                       c = contains.call(dscr, "c");
-                       e = contains.call(dscr, "e");
-                       w = contains.call(dscr, "w");
-               } else {
-                       c = w = true;
-                       e = false;
-               }
-
-               desc = { value: value, configurable: c, enumerable: e, writable: w };
-               return !options ? desc : assign(normalizeOptions(options), desc);
-       });
-
-       d.gs = function (dscr, get, set/*, options*/) {
-               var c, e, options, desc;
-               if (typeof dscr !== "string") {
-                       options = set;
-                       set = get;
-                       get = dscr;
-                       dscr = null;
-               } else {
-                       options = arguments[3];
-               }
-               if (!is(get)) {
-                       get = undefined;
-               } else if (!is$4(get)) {
-                       options = get;
-                       get = set = undefined;
-               } else if (!is(set)) {
-                       set = undefined;
-               } else if (!is$4(set)) {
-                       options = set;
-                       set = undefined;
-               }
-               if (is(dscr)) {
-                       c = contains.call(dscr, "c");
-                       e = contains.call(dscr, "e");
-               } else {
-                       c = true;
-                       e = false;
-               }
-
-               desc = { get: get, set: set, configurable: c, enumerable: e };
-               return !options ? desc : assign(normalizeOptions(options), desc);
+       var enforce = function (it) {
+         return has$1(it) ? get(it) : set(it, {});
        };
-       });
 
-       var eventEmitter = createCommonjsModule(function (module, exports) {
+       var getterFor = function (TYPE) {
+         return function (it) {
+           var state;
+           if (!isObject(it) || (state = get(it)).type !== TYPE) {
+             throw TypeError('Incompatible receiver, ' + TYPE + ' required');
+           } return state;
+         };
+       };
 
-       var apply = Function.prototype.apply, call = Function.prototype.call
-         , create = Object.create, defineProperty = Object.defineProperty
-         , defineProperties = Object.defineProperties
-         , hasOwnProperty = Object.prototype.hasOwnProperty
-         , descriptor = { configurable: true, enumerable: false, writable: true }
+       if (nativeWeakMap) {
+         var store$1 = new WeakMap$1();
+         var wmget = store$1.get;
+         var wmhas = store$1.has;
+         var wmset = store$1.set;
+         set = function (it, metadata) {
+           wmset.call(store$1, it, metadata);
+           return metadata;
+         };
+         get = function (it) {
+           return wmget.call(store$1, it) || {};
+         };
+         has$1 = function (it) {
+           return wmhas.call(store$1, it);
+         };
+       } else {
+         var STATE = sharedKey('state');
+         hiddenKeys[STATE] = true;
+         set = function (it, metadata) {
+           createNonEnumerableProperty(it, STATE, metadata);
+           return metadata;
+         };
+         get = function (it) {
+           return has(it, STATE) ? it[STATE] : {};
+         };
+         has$1 = function (it) {
+           return has(it, STATE);
+         };
+       }
 
-         , on, once, off, emit, methods, descriptors, base;
+       var internalState = {
+         set: set,
+         get: get,
+         has: has$1,
+         enforce: enforce,
+         getterFor: getterFor
+       };
 
-       on = function (type, listener) {
-               var data;
+       var redefine = createCommonjsModule(function (module) {
+       var getInternalState = internalState.get;
+       var enforceInternalState = internalState.enforce;
+       var TEMPLATE = String(String).split('String');
 
-               validCallable(listener);
+       (module.exports = function (O, key, value, options) {
+         var unsafe = options ? !!options.unsafe : false;
+         var simple = options ? !!options.enumerable : false;
+         var noTargetGet = options ? !!options.noTargetGet : false;
+         if (typeof value == 'function') {
+           if (typeof key == 'string' && !has(value, 'name')) createNonEnumerableProperty(value, 'name', key);
+           enforceInternalState(value).source = TEMPLATE.join(typeof key == 'string' ? key : '');
+         }
+         if (O === global_1) {
+           if (simple) O[key] = value;
+           else setGlobal(key, value);
+           return;
+         } else if (!unsafe) {
+           delete O[key];
+         } else if (!noTargetGet && O[key]) {
+           simple = true;
+         }
+         if (simple) O[key] = value;
+         else createNonEnumerableProperty(O, key, value);
+       // add fake Function#toString for correct work wrapped methods / constructors with methods like LoDash isNative
+       })(Function.prototype, 'toString', function toString() {
+         return typeof this == 'function' && getInternalState(this).source || inspectSource(this);
+       });
+       });
 
-               if (!hasOwnProperty.call(this, '__ee__')) {
-                       data = descriptor.value = create(null);
-                       defineProperty(this, '__ee__', descriptor);
-                       descriptor.value = null;
-               } else {
-                       data = this.__ee__;
-               }
-               if (!data[type]) data[type] = listener;
-               else if (typeof data[type] === 'object') data[type].push(listener);
-               else data[type] = [data[type], listener];
+       var path = global_1;
 
-               return this;
+       var aFunction = function (variable) {
+         return typeof variable == 'function' ? variable : undefined;
        };
 
-       once = function (type, listener) {
-               var once, self;
-
-               validCallable(listener);
-               self = this;
-               on.call(this, type, once = function () {
-                       off.call(self, type, once);
-                       apply.call(listener, this, arguments);
-               });
-
-               once.__eeOnceListener__ = listener;
-               return this;
+       var getBuiltIn = function (namespace, method) {
+         return arguments.length < 2 ? aFunction(path[namespace]) || aFunction(global_1[namespace])
+           : path[namespace] && path[namespace][method] || global_1[namespace] && global_1[namespace][method];
        };
 
-       off = function (type, listener) {
-               var data, listeners, candidate, i;
-
-               validCallable(listener);
-
-               if (!hasOwnProperty.call(this, '__ee__')) return this;
-               data = this.__ee__;
-               if (!data[type]) return this;
-               listeners = data[type];
-
-               if (typeof listeners === 'object') {
-                       for (i = 0; (candidate = listeners[i]); ++i) {
-                               if ((candidate === listener) ||
-                                               (candidate.__eeOnceListener__ === listener)) {
-                                       if (listeners.length === 2) data[type] = listeners[i ? 0 : 1];
-                                       else listeners.splice(i, 1);
-                               }
-                       }
-               } else {
-                       if ((listeners === listener) ||
-                                       (listeners.__eeOnceListener__ === listener)) {
-                               delete data[type];
-                       }
-               }
+       var ceil = Math.ceil;
+       var floor = Math.floor;
 
-               return this;
+       // `ToInteger` abstract operation
+       // https://tc39.github.io/ecma262/#sec-tointeger
+       var toInteger = function (argument) {
+         return isNaN(argument = +argument) ? 0 : (argument > 0 ? floor : ceil)(argument);
        };
 
-       emit = function (type) {
-               var i, l, listener, listeners, args;
+       var min = Math.min;
 
-               if (!hasOwnProperty.call(this, '__ee__')) return;
-               listeners = this.__ee__[type];
-               if (!listeners) return;
+       // `ToLength` abstract operation
+       // https://tc39.github.io/ecma262/#sec-tolength
+       var toLength = function (argument) {
+         return argument > 0 ? min(toInteger(argument), 0x1FFFFFFFFFFFFF) : 0; // 2 ** 53 - 1 == 9007199254740991
+       };
 
-               if (typeof listeners === 'object') {
-                       l = arguments.length;
-                       args = new Array(l - 1);
-                       for (i = 1; i < l; ++i) args[i - 1] = arguments[i];
+       var max = Math.max;
+       var min$1 = Math.min;
 
-                       listeners = listeners.slice();
-                       for (i = 0; (listener = listeners[i]); ++i) {
-                               apply.call(listener, this, args);
-                       }
-               } else {
-                       switch (arguments.length) {
-                       case 1:
-                               call.call(listeners, this);
-                               break;
-                       case 2:
-                               call.call(listeners, this, arguments[1]);
-                               break;
-                       case 3:
-                               call.call(listeners, this, arguments[1], arguments[2]);
-                               break;
-                       default:
-                               l = arguments.length;
-                               args = new Array(l - 1);
-                               for (i = 1; i < l; ++i) {
-                                       args[i - 1] = arguments[i];
-                               }
-                               apply.call(listeners, this, args);
-                       }
-               }
+       // Helper for a popular repeating case of the spec:
+       // Let integer be ? ToInteger(index).
+       // If integer < 0, let result be max((length + integer), 0); else let result be min(integer, length).
+       var toAbsoluteIndex = function (index, length) {
+         var integer = toInteger(index);
+         return integer < 0 ? max(integer + length, 0) : min$1(integer, length);
        };
 
-       methods = {
-               on: on,
-               once: once,
-               off: off,
-               emit: emit
+       // `Array.prototype.{ indexOf, includes }` methods implementation
+       var createMethod = function (IS_INCLUDES) {
+         return function ($this, el, fromIndex) {
+           var O = toIndexedObject($this);
+           var length = toLength(O.length);
+           var index = toAbsoluteIndex(fromIndex, length);
+           var value;
+           // Array#includes uses SameValueZero equality algorithm
+           // eslint-disable-next-line no-self-compare
+           if (IS_INCLUDES && el != el) while (length > index) {
+             value = O[index++];
+             // eslint-disable-next-line no-self-compare
+             if (value != value) return true;
+           // Array#indexOf ignores holes, Array#includes - not
+           } else for (;length > index; index++) {
+             if ((IS_INCLUDES || index in O) && O[index] === el) return IS_INCLUDES || index || 0;
+           } return !IS_INCLUDES && -1;
+         };
        };
 
-       descriptors = {
-               on: d_1(on),
-               once: d_1(once),
-               off: d_1(off),
-               emit: d_1(emit)
+       var arrayIncludes = {
+         // `Array.prototype.includes` method
+         // https://tc39.github.io/ecma262/#sec-array.prototype.includes
+         includes: createMethod(true),
+         // `Array.prototype.indexOf` method
+         // https://tc39.github.io/ecma262/#sec-array.prototype.indexof
+         indexOf: createMethod(false)
        };
 
-       base = defineProperties({}, descriptors);
+       var indexOf = arrayIncludes.indexOf;
 
-       module.exports = exports = function (o) {
-               return (o == null) ? create(base) : defineProperties(Object(o), descriptors);
-       };
-       exports.methods = methods;
-       });
 
-       var validTypes = { object: true, symbol: true };
+       var objectKeysInternal = function (object, names) {
+         var O = toIndexedObject(object);
+         var i = 0;
+         var result = [];
+         var key;
+         for (key in O) !has(hiddenKeys, key) && has(O, key) && result.push(key);
+         // Don't enum bug & hidden keys
+         while (names.length > i) if (has(O, key = names[i++])) {
+           ~indexOf(result, key) || result.push(key);
+         }
+         return result;
+       };
 
-       var isImplemented$7 = function () {
-               var symbol;
-               if (typeof Symbol !== 'function') return false;
-               symbol = Symbol('test symbol');
-               try { String(symbol); } catch (e) { return false; }
+       // IE8- don't enum bug keys
+       var enumBugKeys = [
+         'constructor',
+         'hasOwnProperty',
+         'isPrototypeOf',
+         'propertyIsEnumerable',
+         'toLocaleString',
+         'toString',
+         'valueOf'
+       ];
 
-               // Return 'true' also for polyfills
-               if (!validTypes[typeof Symbol.iterator]) return false;
-               if (!validTypes[typeof Symbol.toPrimitive]) return false;
-               if (!validTypes[typeof Symbol.toStringTag]) return false;
+       var hiddenKeys$1 = enumBugKeys.concat('length', 'prototype');
 
-               return true;
+       // `Object.getOwnPropertyNames` method
+       // https://tc39.github.io/ecma262/#sec-object.getownpropertynames
+       var f$3 = Object.getOwnPropertyNames || function getOwnPropertyNames(O) {
+         return objectKeysInternal(O, hiddenKeys$1);
        };
 
-       var isSymbol = function (x) {
-               if (!x) return false;
-               if (typeof x === 'symbol') return true;
-               if (!x.constructor) return false;
-               if (x.constructor.name !== 'Symbol') return false;
-               return (x[x.constructor.toStringTag] === 'Symbol');
+       var objectGetOwnPropertyNames = {
+               f: f$3
        };
 
-       var validateSymbol = function (value) {
-               if (!isSymbol(value)) throw new TypeError(value + " is not a symbol");
-               return value;
+       var f$4 = Object.getOwnPropertySymbols;
+
+       var objectGetOwnPropertySymbols = {
+               f: f$4
        };
 
-       var create$3 = Object.create, defineProperties = Object.defineProperties
-         , defineProperty$1 = Object.defineProperty, objPrototype = Object.prototype
-         , NativeSymbol, SymbolPolyfill, HiddenSymbol, globalSymbols = create$3(null)
-         , isNativeSafe;
-
-       if (typeof Symbol === 'function') {
-               NativeSymbol = Symbol;
-               try {
-                       String(NativeSymbol());
-                       isNativeSafe = true;
-               } catch (ignore) {}
-       }
-
-       var generateName = (function () {
-               var created = create$3(null);
-               return function (desc) {
-                       var postfix = 0, name, ie11BugWorkaround;
-                       while (created[desc + (postfix || '')]) ++postfix;
-                       desc += (postfix || '');
-                       created[desc] = true;
-                       name = '@@' + desc;
-                       defineProperty$1(objPrototype, name, d_1.gs(null, function (value) {
-                               // For IE11 issue see:
-                               // https://connect.microsoft.com/IE/feedbackdetail/view/1928508/
-                               //    ie11-broken-getters-on-dom-objects
-                               // https://github.com/medikoo/es6-symbol/issues/12
-                               if (ie11BugWorkaround) return;
-                               ie11BugWorkaround = true;
-                               defineProperty$1(this, name, d_1(value));
-                               ie11BugWorkaround = false;
-                       }));
-                       return name;
-               };
-       }());
-
-       // Internal constructor (not one exposed) for creating Symbol instances.
-       // This one is used to ensure that `someSymbol instanceof Symbol` always return false
-       HiddenSymbol = function Symbol(description) {
-               if (this instanceof HiddenSymbol) throw new TypeError('Symbol is not a constructor');
-               return SymbolPolyfill(description);
+       // all object keys, includes non-enumerable and symbols
+       var ownKeys = getBuiltIn('Reflect', 'ownKeys') || function ownKeys(it) {
+         var keys = objectGetOwnPropertyNames.f(anObject(it));
+         var getOwnPropertySymbols = objectGetOwnPropertySymbols.f;
+         return getOwnPropertySymbols ? keys.concat(getOwnPropertySymbols(it)) : keys;
        };
 
-       // Exposed `Symbol` constructor
-       // (returns instances of HiddenSymbol)
-       var polyfill = SymbolPolyfill = function Symbol(description) {
-               var symbol;
-               if (this instanceof Symbol) throw new TypeError('Symbol is not a constructor');
-               if (isNativeSafe) return NativeSymbol(description);
-               symbol = create$3(HiddenSymbol.prototype);
-               description = (description === undefined ? '' : String(description));
-               return defineProperties(symbol, {
-                       __description__: d_1('', description),
-                       __name__: d_1('', generateName(description))
-               });
+       var copyConstructorProperties = function (target, source) {
+         var keys = ownKeys(source);
+         var defineProperty = objectDefineProperty.f;
+         var getOwnPropertyDescriptor = objectGetOwnPropertyDescriptor.f;
+         for (var i = 0; i < keys.length; i++) {
+           var key = keys[i];
+           if (!has(target, key)) defineProperty(target, key, getOwnPropertyDescriptor(source, key));
+         }
        };
-       defineProperties(SymbolPolyfill, {
-               for: d_1(function (key) {
-                       if (globalSymbols[key]) return globalSymbols[key];
-                       return (globalSymbols[key] = SymbolPolyfill(String(key)));
-               }),
-               keyFor: d_1(function (s) {
-                       var key;
-                       validateSymbol(s);
-                       for (key in globalSymbols) if (globalSymbols[key] === s) return key;
-               }),
-
-               // To ensure proper interoperability with other native functions (e.g. Array.from)
-               // fallback to eventual native implementation of given symbol
-               hasInstance: d_1('', (NativeSymbol && NativeSymbol.hasInstance) || SymbolPolyfill('hasInstance')),
-               isConcatSpreadable: d_1('', (NativeSymbol && NativeSymbol.isConcatSpreadable) ||
-                       SymbolPolyfill('isConcatSpreadable')),
-               iterator: d_1('', (NativeSymbol && NativeSymbol.iterator) || SymbolPolyfill('iterator')),
-               match: d_1('', (NativeSymbol && NativeSymbol.match) || SymbolPolyfill('match')),
-               replace: d_1('', (NativeSymbol && NativeSymbol.replace) || SymbolPolyfill('replace')),
-               search: d_1('', (NativeSymbol && NativeSymbol.search) || SymbolPolyfill('search')),
-               species: d_1('', (NativeSymbol && NativeSymbol.species) || SymbolPolyfill('species')),
-               split: d_1('', (NativeSymbol && NativeSymbol.split) || SymbolPolyfill('split')),
-               toPrimitive: d_1('', (NativeSymbol && NativeSymbol.toPrimitive) || SymbolPolyfill('toPrimitive')),
-               toStringTag: d_1('', (NativeSymbol && NativeSymbol.toStringTag) || SymbolPolyfill('toStringTag')),
-               unscopables: d_1('', (NativeSymbol && NativeSymbol.unscopables) || SymbolPolyfill('unscopables'))
-       });
 
-       // Internal tweaks for real symbol producer
-       defineProperties(HiddenSymbol.prototype, {
-               constructor: d_1(SymbolPolyfill),
-               toString: d_1('', function () { return this.__name__; })
-       });
+       var replacement = /#|\.prototype\./;
 
-       // Proper implementation of methods exposed on Symbol.prototype
-       // They won't be accessible on produced symbol instances as they derive from HiddenSymbol.prototype
-       defineProperties(SymbolPolyfill.prototype, {
-               toString: d_1(function () { return 'Symbol (' + validateSymbol(this).__description__ + ')'; }),
-               valueOf: d_1(function () { return validateSymbol(this); })
-       });
-       defineProperty$1(SymbolPolyfill.prototype, SymbolPolyfill.toPrimitive, d_1('', function () {
-               var symbol = validateSymbol(this);
-               if (typeof symbol === 'symbol') return symbol;
-               return symbol.toString();
-       }));
-       defineProperty$1(SymbolPolyfill.prototype, SymbolPolyfill.toStringTag, d_1('c', 'Symbol'));
+       var isForced = function (feature, detection) {
+         var value = data[normalize(feature)];
+         return value == POLYFILL ? true
+           : value == NATIVE ? false
+           : typeof detection == 'function' ? fails(detection)
+           : !!detection;
+       };
 
-       // Proper implementaton of toPrimitive and toStringTag for returned symbol instances
-       defineProperty$1(HiddenSymbol.prototype, SymbolPolyfill.toStringTag,
-               d_1('c', SymbolPolyfill.prototype[SymbolPolyfill.toStringTag]));
+       var normalize = isForced.normalize = function (string) {
+         return String(string).replace(replacement, '.').toLowerCase();
+       };
 
-       // Note: It's important to define `toPrimitive` as last one, as some implementations
-       // implement `toPrimitive` natively without implementing `toStringTag` (or other specified symbols)
-       // And that may invoke error in definition flow:
-       // See: https://github.com/medikoo/es6-symbol/issues/13#issuecomment-164146149
-       defineProperty$1(HiddenSymbol.prototype, SymbolPolyfill.toPrimitive,
-               d_1('c', SymbolPolyfill.prototype[SymbolPolyfill.toPrimitive]));
+       var data = isForced.data = {};
+       var NATIVE = isForced.NATIVE = 'N';
+       var POLYFILL = isForced.POLYFILL = 'P';
 
-       var es6Symbol = isImplemented$7() ? Symbol : polyfill;
+       var isForced_1 = isForced;
 
-       var objToString = Object.prototype.toString
-         , id = objToString.call((function () { return arguments; })());
+       var getOwnPropertyDescriptor$1 = objectGetOwnPropertyDescriptor.f;
 
-       var isArguments = function (value) { return objToString.call(value) === id; };
 
-       var objToString$1 = Object.prototype.toString, id$1 = objToString$1.call("");
 
-       var isString = function (value) {
-               return (
-                       typeof value === "string" ||
-                       (value &&
-                               typeof value === "object" &&
-                               (value instanceof String || objToString$1.call(value) === id$1)) ||
-                       false
-               );
-       };
 
-       var isImplemented$8 = function () {
-               if (typeof globalThis !== "object") return false;
-               if (!globalThis) return false;
-               return globalThis.Array === Array;
-       };
 
-       var naiveFallback = function () {
-               if (typeof self === "object" && self) return self;
-               if (typeof window === "object" && window) return window;
-               throw new Error("Unable to resolve global `this`");
-       };
 
-       var implementation = (function () {
-               if (this) return this;
-
-               // Unexpected strict mode (may happen if e.g. bundled into ESM module)
-
-               // Thanks @mathiasbynens -> https://mathiasbynens.be/notes/globalthis
-               // In all ES5+ engines global object inherits from Object.prototype
-               // (if you approached one that doesn't please report)
-               try {
-                       Object.defineProperty(Object.prototype, "__global__", {
-                               get: function () { return this; },
-                               configurable: true
-                       });
-               } catch (error) {
-                       // Unfortunate case of Object.prototype being sealed (via preventExtensions, seal or freeze)
-                       return naiveFallback();
-               }
-               try {
-                       // Safari case (window.__global__ is resolved with global context, but __global__ does not)
-                       if (!__global__) return naiveFallback();
-                       return __global__;
-               } finally {
-                       delete Object.prototype.__global__;
-               }
-       })();
+       /*
+         options.target      - name of the target object
+         options.global      - target is the global object
+         options.stat        - export as static methods of target
+         options.proto       - export as prototype methods of target
+         options.real        - real prototype method for the `pure` version
+         options.forced      - export even if the native feature is available
+         options.bind        - bind methods to the target, required for the `pure` version
+         options.wrap        - wrap constructors to preventing global pollution, required for the `pure` version
+         options.unsafe      - use the simple assignment of property instead of delete + defineProperty
+         options.sham        - add a flag to not completely full polyfills
+         options.enumerable  - export as enumerable property
+         options.noTargetGet - prevent calling a getter on target
+       */
+       var _export = function (options, source) {
+         var TARGET = options.target;
+         var GLOBAL = options.global;
+         var STATIC = options.stat;
+         var FORCED, target, key, targetProperty, sourceProperty, descriptor;
+         if (GLOBAL) {
+           target = global_1;
+         } else if (STATIC) {
+           target = global_1[TARGET] || setGlobal(TARGET, {});
+         } else {
+           target = (global_1[TARGET] || {}).prototype;
+         }
+         if (target) for (key in source) {
+           sourceProperty = source[key];
+           if (options.noTargetGet) {
+             descriptor = getOwnPropertyDescriptor$1(target, key);
+             targetProperty = descriptor && descriptor.value;
+           } else targetProperty = target[key];
+           FORCED = isForced_1(GLOBAL ? key : TARGET + (STATIC ? '.' : '#') + key, options.forced);
+           // contained in target
+           if (!FORCED && targetProperty !== undefined) {
+             if (typeof sourceProperty === typeof targetProperty) continue;
+             copyConstructorProperties(sourceProperty, targetProperty);
+           }
+           // add a flag to not completely full polyfills
+           if (options.sham || (targetProperty && targetProperty.sham)) {
+             createNonEnumerableProperty(sourceProperty, 'sham', true);
+           }
+           // extend global
+           redefine(target, key, sourceProperty, options);
+         }
+       };
 
-       var globalThis_1 = isImplemented$8() ? globalThis : implementation;
+       // `Date.now` method
+       // https://tc39.github.io/ecma262/#sec-date.now
+       _export({ target: 'Date', stat: true }, {
+         now: function now() {
+           return new Date().getTime();
+         }
+       });
 
-       var validTypes$1 = { object: true, symbol: true };
+       var DatePrototype = Date.prototype;
+       var INVALID_DATE = 'Invalid Date';
+       var TO_STRING = 'toString';
+       var nativeDateToString = DatePrototype[TO_STRING];
+       var getTime = DatePrototype.getTime;
+
+       // `Date.prototype.toString` method
+       // https://tc39.github.io/ecma262/#sec-date.prototype.tostring
+       if (new Date(NaN) + '' != INVALID_DATE) {
+         redefine(DatePrototype, TO_STRING, function toString() {
+           var value = getTime.call(this);
+           // eslint-disable-next-line no-self-compare
+           return value === value ? nativeDateToString.call(this) : INVALID_DATE;
+         });
+       }
 
-       var isImplemented$9 = function () {
-               var Symbol = globalThis_1.Symbol;
-               var symbol;
-               if (typeof Symbol !== "function") return false;
-               symbol = Symbol("test symbol");
-               try { String(symbol); }
-               catch (e) { return false; }
+       var nativeSymbol = !!Object.getOwnPropertySymbols && !fails(function () {
+         // Chrome 38 Symbol has incorrect toString conversion
+         // eslint-disable-next-line no-undef
+         return !String(Symbol());
+       });
 
-               // Return 'true' also for polyfills
-               if (!validTypes$1[typeof Symbol.iterator]) return false;
-               if (!validTypes$1[typeof Symbol.toPrimitive]) return false;
-               if (!validTypes$1[typeof Symbol.toStringTag]) return false;
+       var useSymbolAsUid = nativeSymbol
+         // eslint-disable-next-line no-undef
+         && !Symbol.sham
+         // eslint-disable-next-line no-undef
+         && typeof Symbol.iterator == 'symbol';
 
-               return true;
+       // `IsArray` abstract operation
+       // https://tc39.github.io/ecma262/#sec-isarray
+       var isArray = Array.isArray || function isArray(arg) {
+         return classofRaw(arg) == 'Array';
        };
 
-       var isSymbol$1 = function (value) {
-               if (!value) return false;
-               if (typeof value === "symbol") return true;
-               if (!value.constructor) return false;
-               if (value.constructor.name !== "Symbol") return false;
-               return value[value.constructor.toStringTag] === "Symbol";
+       // `ToObject` abstract operation
+       // https://tc39.github.io/ecma262/#sec-toobject
+       var toObject = function (argument) {
+         return Object(requireObjectCoercible(argument));
        };
 
-       var validateSymbol$1 = function (value) {
-               if (!isSymbol$1(value)) throw new TypeError(value + " is not a symbol");
-               return value;
+       // `Object.keys` method
+       // https://tc39.github.io/ecma262/#sec-object.keys
+       var objectKeys = Object.keys || function keys(O) {
+         return objectKeysInternal(O, enumBugKeys);
        };
 
-       var create$4 = Object.create, defineProperty$2 = Object.defineProperty, objPrototype$1 = Object.prototype;
-
-       var created = create$4(null);
-       var generateName$1 = function (desc) {
-               var postfix = 0, name, ie11BugWorkaround;
-               while (created[desc + (postfix || "")]) ++postfix;
-               desc += postfix || "";
-               created[desc] = true;
-               name = "@@" + desc;
-               defineProperty$2(
-                       objPrototype$1,
-                       name,
-                       d_1.gs(null, function (value) {
-                               // For IE11 issue see:
-                               // https://connect.microsoft.com/IE/feedbackdetail/view/1928508/
-                               //    ie11-broken-getters-on-dom-objects
-                               // https://github.com/medikoo/es6-symbol/issues/12
-                               if (ie11BugWorkaround) return;
-                               ie11BugWorkaround = true;
-                               defineProperty$2(this, name, d_1(value));
-                               ie11BugWorkaround = false;
-                       })
-               );
-               return name;
+       // `Object.defineProperties` method
+       // https://tc39.github.io/ecma262/#sec-object.defineproperties
+       var objectDefineProperties = descriptors ? Object.defineProperties : function defineProperties(O, Properties) {
+         anObject(O);
+         var keys = objectKeys(Properties);
+         var length = keys.length;
+         var index = 0;
+         var key;
+         while (length > index) objectDefineProperty.f(O, key = keys[index++], Properties[key]);
+         return O;
+       };
+
+       var html = getBuiltIn('document', 'documentElement');
+
+       var GT = '>';
+       var LT = '<';
+       var PROTOTYPE = 'prototype';
+       var SCRIPT = 'script';
+       var IE_PROTO = sharedKey('IE_PROTO');
+
+       var EmptyConstructor = function () { /* empty */ };
+
+       var scriptTag = function (content) {
+         return LT + SCRIPT + GT + content + LT + '/' + SCRIPT + GT;
+       };
+
+       // Create object with fake `null` prototype: use ActiveX Object with cleared prototype
+       var NullProtoObjectViaActiveX = function (activeXDocument) {
+         activeXDocument.write(scriptTag(''));
+         activeXDocument.close();
+         var temp = activeXDocument.parentWindow.Object;
+         activeXDocument = null; // avoid memory leak
+         return temp;
+       };
+
+       // Create object with fake `null` prototype: use iframe Object with cleared prototype
+       var NullProtoObjectViaIFrame = function () {
+         // Thrash, waste and sodomy: IE GC bug
+         var iframe = documentCreateElement('iframe');
+         var JS = 'java' + SCRIPT + ':';
+         var iframeDocument;
+         iframe.style.display = 'none';
+         html.appendChild(iframe);
+         // https://github.com/zloirock/core-js/issues/475
+         iframe.src = String(JS);
+         iframeDocument = iframe.contentWindow.document;
+         iframeDocument.open();
+         iframeDocument.write(scriptTag('document.F=Object'));
+         iframeDocument.close();
+         return iframeDocument.F;
+       };
+
+       // Check for document.domain and active x support
+       // No need to use active x approach when document.domain is not set
+       // see https://github.com/es-shims/es5-shim/issues/150
+       // variation of https://github.com/kitcambridge/es5-shim/commit/4f738ac066346
+       // avoid IE GC bug
+       var activeXDocument;
+       var NullProtoObject = function () {
+         try {
+           /* global ActiveXObject */
+           activeXDocument = document.domain && new ActiveXObject('htmlfile');
+         } catch (error) { /* ignore */ }
+         NullProtoObject = activeXDocument ? NullProtoObjectViaActiveX(activeXDocument) : NullProtoObjectViaIFrame();
+         var length = enumBugKeys.length;
+         while (length--) delete NullProtoObject[PROTOTYPE][enumBugKeys[length]];
+         return NullProtoObject();
        };
 
-       var NativeSymbol$1 = globalThis_1.Symbol;
-
-       var standardSymbols = function (SymbolPolyfill) {
-               return Object.defineProperties(SymbolPolyfill, {
-                       // To ensure proper interoperability with other native functions (e.g. Array.from)
-                       // fallback to eventual native implementation of given symbol
-                       hasInstance: d_1(
-                               "", (NativeSymbol$1 && NativeSymbol$1.hasInstance) || SymbolPolyfill("hasInstance")
-                       ),
-                       isConcatSpreadable: d_1(
-                               "",
-                               (NativeSymbol$1 && NativeSymbol$1.isConcatSpreadable) ||
-                                       SymbolPolyfill("isConcatSpreadable")
-                       ),
-                       iterator: d_1("", (NativeSymbol$1 && NativeSymbol$1.iterator) || SymbolPolyfill("iterator")),
-                       match: d_1("", (NativeSymbol$1 && NativeSymbol$1.match) || SymbolPolyfill("match")),
-                       replace: d_1("", (NativeSymbol$1 && NativeSymbol$1.replace) || SymbolPolyfill("replace")),
-                       search: d_1("", (NativeSymbol$1 && NativeSymbol$1.search) || SymbolPolyfill("search")),
-                       species: d_1("", (NativeSymbol$1 && NativeSymbol$1.species) || SymbolPolyfill("species")),
-                       split: d_1("", (NativeSymbol$1 && NativeSymbol$1.split) || SymbolPolyfill("split")),
-                       toPrimitive: d_1(
-                               "", (NativeSymbol$1 && NativeSymbol$1.toPrimitive) || SymbolPolyfill("toPrimitive")
-                       ),
-                       toStringTag: d_1(
-                               "", (NativeSymbol$1 && NativeSymbol$1.toStringTag) || SymbolPolyfill("toStringTag")
-                       ),
-                       unscopables: d_1(
-                               "", (NativeSymbol$1 && NativeSymbol$1.unscopables) || SymbolPolyfill("unscopables")
-                       )
-               });
-       };
+       hiddenKeys[IE_PROTO] = true;
 
-       var registry = Object.create(null);
-
-       var symbolRegistry = function (SymbolPolyfill) {
-               return Object.defineProperties(SymbolPolyfill, {
-                       for: d_1(function (key) {
-                               if (registry[key]) return registry[key];
-                               return (registry[key] = SymbolPolyfill(String(key)));
-                       }),
-                       keyFor: d_1(function (symbol) {
-                               var key;
-                               validateSymbol$1(symbol);
-                               for (key in registry) {
-                                       if (registry[key] === symbol) return key;
-                               }
-                               return undefined;
-                       })
-               });
+       // `Object.create` method
+       // https://tc39.github.io/ecma262/#sec-object.create
+       var objectCreate = Object.create || function create(O, Properties) {
+         var result;
+         if (O !== null) {
+           EmptyConstructor[PROTOTYPE] = anObject(O);
+           result = new EmptyConstructor();
+           EmptyConstructor[PROTOTYPE] = null;
+           // add "__proto__" for Object.getPrototypeOf polyfill
+           result[IE_PROTO] = O;
+         } else result = NullProtoObject();
+         return Properties === undefined ? result : objectDefineProperties(result, Properties);
        };
 
-       var NativeSymbol$2         = globalThis_1.Symbol;
-
-       var create$5 = Object.create
-         , defineProperties$1 = Object.defineProperties
-         , defineProperty$3 = Object.defineProperty;
+       var nativeGetOwnPropertyNames = objectGetOwnPropertyNames.f;
 
-       var SymbolPolyfill$1, HiddenSymbol$1, isNativeSafe$1;
+       var toString$1 = {}.toString;
 
-       if (typeof NativeSymbol$2 === "function") {
-               try {
-                       String(NativeSymbol$2());
-                       isNativeSafe$1 = true;
-               } catch (ignore) {}
-       } else {
-               NativeSymbol$2 = null;
-       }
+       var windowNames = typeof window == 'object' && window && Object.getOwnPropertyNames
+         ? Object.getOwnPropertyNames(window) : [];
 
-       // Internal constructor (not one exposed) for creating Symbol instances.
-       // This one is used to ensure that `someSymbol instanceof Symbol` always return false
-       HiddenSymbol$1 = function Symbol(description) {
-               if (this instanceof HiddenSymbol$1) throw new TypeError("Symbol is not a constructor");
-               return SymbolPolyfill$1(description);
+       var getWindowNames = function (it) {
+         try {
+           return nativeGetOwnPropertyNames(it);
+         } catch (error) {
+           return windowNames.slice();
+         }
        };
 
-       // Exposed `Symbol` constructor
-       // (returns instances of HiddenSymbol)
-       var polyfill$1 = SymbolPolyfill$1 = function Symbol(description) {
-               var symbol;
-               if (this instanceof Symbol) throw new TypeError("Symbol is not a constructor");
-               if (isNativeSafe$1) return NativeSymbol$2(description);
-               symbol = create$5(HiddenSymbol$1.prototype);
-               description = description === undefined ? "" : String(description);
-               return defineProperties$1(symbol, {
-                       __description__: d_1("", description),
-                       __name__: d_1("", generateName$1(description))
-               });
+       // fallback for IE11 buggy Object.getOwnPropertyNames with iframe and window
+       var f$5 = function getOwnPropertyNames(it) {
+         return windowNames && toString$1.call(it) == '[object Window]'
+           ? getWindowNames(it)
+           : nativeGetOwnPropertyNames(toIndexedObject(it));
        };
 
-       standardSymbols(SymbolPolyfill$1);
-       symbolRegistry(SymbolPolyfill$1);
-
-       // Internal tweaks for real symbol producer
-       defineProperties$1(HiddenSymbol$1.prototype, {
-               constructor: d_1(SymbolPolyfill$1),
-               toString: d_1("", function () { return this.__name__; })
-       });
-
-       // Proper implementation of methods exposed on Symbol.prototype
-       // They won't be accessible on produced symbol instances as they derive from HiddenSymbol.prototype
-       defineProperties$1(SymbolPolyfill$1.prototype, {
-               toString: d_1(function () { return "Symbol (" + validateSymbol$1(this).__description__ + ")"; }),
-               valueOf: d_1(function () { return validateSymbol$1(this); })
-       });
-       defineProperty$3(
-               SymbolPolyfill$1.prototype,
-               SymbolPolyfill$1.toPrimitive,
-               d_1("", function () {
-                       var symbol = validateSymbol$1(this);
-                       if (typeof symbol === "symbol") return symbol;
-                       return symbol.toString();
-               })
-       );
-       defineProperty$3(SymbolPolyfill$1.prototype, SymbolPolyfill$1.toStringTag, d_1("c", "Symbol"));
-
-       // Proper implementaton of toPrimitive and toStringTag for returned symbol instances
-       defineProperty$3(
-               HiddenSymbol$1.prototype, SymbolPolyfill$1.toStringTag,
-               d_1("c", SymbolPolyfill$1.prototype[SymbolPolyfill$1.toStringTag])
-       );
-
-       // Note: It's important to define `toPrimitive` as last one, as some implementations
-       // implement `toPrimitive` natively without implementing `toStringTag` (or other specified symbols)
-       // And that may invoke error in definition flow:
-       // See: https://github.com/medikoo/es6-symbol/issues/13#issuecomment-164146149
-       defineProperty$3(
-               HiddenSymbol$1.prototype, SymbolPolyfill$1.toPrimitive,
-               d_1("c", SymbolPolyfill$1.prototype[SymbolPolyfill$1.toPrimitive])
-       );
-
-       var es6Symbol$1 = isImplemented$9()
-               ? globalThis_1.Symbol
-               : polyfill$1;
-
-       var iteratorSymbol = es6Symbol$1.iterator
-         , isArray        = Array.isArray;
-
-       var isIterable = function (value) {
-               if (!isValue(value)) return false;
-               if (isArray(value)) return true;
-               if (isString(value)) return true;
-               if (isArguments(value)) return true;
-               return typeof value[iteratorSymbol] === "function";
+       var objectGetOwnPropertyNamesExternal = {
+               f: f$5
        };
 
-       var validIterable = function (value) {
-               if (!isIterable(value)) throw new TypeError(value + " is not iterable");
-               return value;
-       };
+       var WellKnownSymbolsStore = shared('wks');
+       var Symbol$1 = global_1.Symbol;
+       var createWellKnownSymbol = useSymbolAsUid ? Symbol$1 : Symbol$1 && Symbol$1.withoutSetter || uid;
 
-       var objectToString = Object.prototype.toString;
-
-       var coerce = function (value) {
-               if (!is(value)) return null;
-               if (is$1(value)) {
-                       // Reject Object.prototype.toString coercion
-                       var valueToString = value.toString;
-                       if (typeof valueToString !== "function") return null;
-                       if (valueToString === objectToString) return null;
-                       // Note: It can be object coming from other realm, still as there's no ES3 and CSP compliant
-                       // way to resolve its realm's Object.prototype.toString it's left as not addressed edge case
-               }
-               try {
-                       return "" + value; // Ensure implicit coercion
-               } catch (error) {
-                       return null;
-               }
+       var wellKnownSymbol = function (name) {
+         if (!has(WellKnownSymbolsStore, name)) {
+           if (nativeSymbol && has(Symbol$1, name)) WellKnownSymbolsStore[name] = Symbol$1[name];
+           else WellKnownSymbolsStore[name] = createWellKnownSymbol('Symbol.' + name);
+         } return WellKnownSymbolsStore[name];
        };
 
-       var safeToString = function (value) {
-               try {
-                       return value.toString();
-               } catch (error) {
-                       try { return String(value); }
-                       catch (error2) { return null; }
-               }
-       };
+       var f$6 = wellKnownSymbol;
 
-       var reNewLine = /[\n\r\u2028\u2029]/g;
-
-       var toShortString = function (value) {
-               var string = safeToString(value);
-               if (string === null) return "<Non-coercible to string value>";
-               // Trim if too long
-               if (string.length > 100) string = string.slice(0, 99) + "…";
-               // Replace eventual new lines
-               string = string.replace(reNewLine, function (char) {
-                       switch (char) {
-                               case "\n":
-                                       return "\\n";
-                               case "\r":
-                                       return "\\r";
-                               case "\u2028":
-                                       return "\\u2028";
-                               case "\u2029":
-                                       return "\\u2029";
-                               /* istanbul ignore next */
-                               default:
-                                       throw new Error("Unexpected character");
-                       }
-               });
-               return string;
+       var wellKnownSymbolWrapped = {
+               f: f$6
        };
 
-       var resolveMessage = function (message, value) {
-               return message.replace("%v", toShortString(value));
-       };
+       var defineProperty = objectDefineProperty.f;
 
-       var resolveException = function (value, defaultMessage, inputOptions) {
-               if (!is$1(inputOptions)) throw new TypeError(resolveMessage(defaultMessage, value));
-               if (!is(value)) {
-                       if ("default" in inputOptions) return inputOptions["default"];
-                       if (inputOptions.isOptional) return null;
-               }
-               var errorMessage = coerce(inputOptions.errorMessage);
-               if (!is(errorMessage)) errorMessage = defaultMessage;
-               throw new TypeError(resolveMessage(errorMessage, value));
+       var defineWellKnownSymbol = function (NAME) {
+         var Symbol = path.Symbol || (path.Symbol = {});
+         if (!has(Symbol, NAME)) defineProperty(Symbol, NAME, {
+           value: wellKnownSymbolWrapped.f(NAME)
+         });
        };
 
-       var ensure = function (value/*, options*/) {
-               if (is(value)) return value;
-               return resolveException(value, "Cannot use %v", arguments[1]);
-       };
+       var defineProperty$1 = objectDefineProperty.f;
 
-       var ensure$1 = function (value/*, options*/) {
-               if (is$4(value)) return value;
-               return resolveException(value, "%v is not a plain function", arguments[1]);
-       };
 
-       var isImplemented$a = function () {
-               var from = Array.from, arr, result;
-               if (typeof from !== "function") return false;
-               arr = ["raz", "dwa"];
-               result = from(arr);
-               return Boolean(result && result !== arr && result[1] === "dwa");
-       };
 
-       var objToString$2 = Object.prototype.toString
-         , isFunctionStringTag = RegExp.prototype.test.bind(/^[object [A-Za-z0-9]*Function]$/);
+       var TO_STRING_TAG = wellKnownSymbol('toStringTag');
 
-       var isFunction = function (value) {
-               return typeof value === "function" && isFunctionStringTag(objToString$2.call(value));
+       var setToStringTag = function (it, TAG, STATIC) {
+         if (it && !has(it = STATIC ? it : it.prototype, TO_STRING_TAG)) {
+           defineProperty$1(it, TO_STRING_TAG, { configurable: true, value: TAG });
+         }
        };
 
-       var iteratorSymbol$1 = es6Symbol$1.iterator
-         , isArray$1        = Array.isArray
-         , call           = Function.prototype.call
-         , desc           = { configurable: true, enumerable: true, writable: true, value: null }
-         , defineProperty$4 = Object.defineProperty;
-
-       // eslint-disable-next-line complexity, max-lines-per-function
-       var shim$7 = function (arrayLike/*, mapFn, thisArg*/) {
-               var mapFn = arguments[1]
-                 , thisArg = arguments[2]
-                 , Context
-                 , i
-                 , j
-                 , arr
-                 , length
-                 , code
-                 , iterator
-                 , result
-                 , getIterator
-                 , value;
-
-               arrayLike = Object(validValue(arrayLike));
-
-               if (isValue(mapFn)) validCallable(mapFn);
-               if (!this || this === Array || !isFunction(this)) {
-                       // Result: Plain array
-                       if (!mapFn) {
-                               if (isArguments(arrayLike)) {
-                                       // Source: Arguments
-                                       length = arrayLike.length;
-                                       if (length !== 1) return Array.apply(null, arrayLike);
-                                       arr = new Array(1);
-                                       arr[0] = arrayLike[0];
-                                       return arr;
-                               }
-                               if (isArray$1(arrayLike)) {
-                                       // Source: Array
-                                       arr = new Array((length = arrayLike.length));
-                                       for (i = 0; i < length; ++i) arr[i] = arrayLike[i];
-                                       return arr;
-                               }
-                       }
-                       arr = [];
-               } else {
-                       // Result: Non plain array
-                       Context = this;
-               }
-
-               if (!isArray$1(arrayLike)) {
-                       if ((getIterator = arrayLike[iteratorSymbol$1]) !== undefined) {
-                               // Source: Iterator
-                               iterator = validCallable(getIterator).call(arrayLike);
-                               if (Context) arr = new Context();
-                               result = iterator.next();
-                               i = 0;
-                               while (!result.done) {
-                                       value = mapFn ? call.call(mapFn, thisArg, result.value, i) : result.value;
-                                       if (Context) {
-                                               desc.value = value;
-                                               defineProperty$4(arr, i, desc);
-                                       } else {
-                                               arr[i] = value;
-                                       }
-                                       result = iterator.next();
-                                       ++i;
-                               }
-                               length = i;
-                       } else if (isString(arrayLike)) {
-                               // Source: String
-                               length = arrayLike.length;
-                               if (Context) arr = new Context();
-                               for (i = 0, j = 0; i < length; ++i) {
-                                       value = arrayLike[i];
-                                       if (i + 1 < length) {
-                                               code = value.charCodeAt(0);
-                                               // eslint-disable-next-line max-depth
-                                               if (code >= 0xd800 && code <= 0xdbff) value += arrayLike[++i];
-                                       }
-                                       value = mapFn ? call.call(mapFn, thisArg, value, j) : value;
-                                       if (Context) {
-                                               desc.value = value;
-                                               defineProperty$4(arr, j, desc);
-                                       } else {
-                                               arr[j] = value;
-                                       }
-                                       ++j;
-                               }
-                               length = j;
-                       }
-               }
-               if (length === undefined) {
-                       // Source: array or array-like
-                       length = toPosInteger(arrayLike.length);
-                       if (Context) arr = new Context(length);
-                       for (i = 0; i < length; ++i) {
-                               value = mapFn ? call.call(mapFn, thisArg, arrayLike[i], i) : arrayLike[i];
-                               if (Context) {
-                                       desc.value = value;
-                                       defineProperty$4(arr, i, desc);
-                               } else {
-                                       arr[i] = value;
-                               }
-                       }
-               }
-               if (Context) {
-                       desc.value = null;
-                       arr.length = length;
-               }
-               return arr;
+       var aFunction$1 = function (it) {
+         if (typeof it != 'function') {
+           throw TypeError(String(it) + ' is not a function');
+         } return it;
        };
 
-       var from_1 = isImplemented$a() ? Array.from : shim$7;
-
-       var copy = function (obj/*, propertyNames, options*/) {
-               var copy = Object(validValue(obj)), propertyNames = arguments[1], options = Object(arguments[2]);
-               if (copy !== obj && !propertyNames) return copy;
-               var result = {};
-               if (propertyNames) {
-                       from_1(propertyNames, function (propertyName) {
-                               if (options.ensure || propertyName in obj) result[propertyName] = obj[propertyName];
-                       });
-               } else {
-                       assign(result, obj);
-               }
-               return result;
+       // optional / simple context binding
+       var functionBindContext = function (fn, that, length) {
+         aFunction$1(fn);
+         if (that === undefined) return fn;
+         switch (length) {
+           case 0: return function () {
+             return fn.call(that);
+           };
+           case 1: return function (a) {
+             return fn.call(that, a);
+           };
+           case 2: return function (a, b) {
+             return fn.call(that, a, b);
+           };
+           case 3: return function (a, b, c) {
+             return fn.call(that, a, b, c);
+           };
+         }
+         return function (/* ...args */) {
+           return fn.apply(that, arguments);
+         };
+       };
+
+       var SPECIES = wellKnownSymbol('species');
+
+       // `ArraySpeciesCreate` abstract operation
+       // https://tc39.github.io/ecma262/#sec-arrayspeciescreate
+       var arraySpeciesCreate = function (originalArray, length) {
+         var C;
+         if (isArray(originalArray)) {
+           C = originalArray.constructor;
+           // cross-realm fallback
+           if (typeof C == 'function' && (C === Array || isArray(C.prototype))) C = undefined;
+           else if (isObject(C)) {
+             C = C[SPECIES];
+             if (C === null) C = undefined;
+           }
+         } return new (C === undefined ? Array : C)(length === 0 ? 0 : length);
+       };
+
+       var push = [].push;
+
+       // `Array.prototype.{ forEach, map, filter, some, every, find, findIndex }` methods implementation
+       var createMethod$1 = function (TYPE) {
+         var IS_MAP = TYPE == 1;
+         var IS_FILTER = TYPE == 2;
+         var IS_SOME = TYPE == 3;
+         var IS_EVERY = TYPE == 4;
+         var IS_FIND_INDEX = TYPE == 6;
+         var NO_HOLES = TYPE == 5 || IS_FIND_INDEX;
+         return function ($this, callbackfn, that, specificCreate) {
+           var O = toObject($this);
+           var self = indexedObject(O);
+           var boundFunction = functionBindContext(callbackfn, that, 3);
+           var length = toLength(self.length);
+           var index = 0;
+           var create = specificCreate || arraySpeciesCreate;
+           var target = IS_MAP ? create($this, length) : IS_FILTER ? create($this, 0) : undefined;
+           var value, result;
+           for (;length > index; index++) if (NO_HOLES || index in self) {
+             value = self[index];
+             result = boundFunction(value, index, O);
+             if (TYPE) {
+               if (IS_MAP) target[index] = result; // map
+               else if (result) switch (TYPE) {
+                 case 3: return true;              // some
+                 case 5: return value;             // find
+                 case 6: return index;             // findIndex
+                 case 2: push.call(target, value); // filter
+               } else if (IS_EVERY) return false;  // every
+             }
+           }
+           return IS_FIND_INDEX ? -1 : IS_SOME || IS_EVERY ? IS_EVERY : target;
+         };
+       };
+
+       var arrayIteration = {
+         // `Array.prototype.forEach` method
+         // https://tc39.github.io/ecma262/#sec-array.prototype.foreach
+         forEach: createMethod$1(0),
+         // `Array.prototype.map` method
+         // https://tc39.github.io/ecma262/#sec-array.prototype.map
+         map: createMethod$1(1),
+         // `Array.prototype.filter` method
+         // https://tc39.github.io/ecma262/#sec-array.prototype.filter
+         filter: createMethod$1(2),
+         // `Array.prototype.some` method
+         // https://tc39.github.io/ecma262/#sec-array.prototype.some
+         some: createMethod$1(3),
+         // `Array.prototype.every` method
+         // https://tc39.github.io/ecma262/#sec-array.prototype.every
+         every: createMethod$1(4),
+         // `Array.prototype.find` method
+         // https://tc39.github.io/ecma262/#sec-array.prototype.find
+         find: createMethod$1(5),
+         // `Array.prototype.findIndex` method
+         // https://tc39.github.io/ecma262/#sec-array.prototype.findIndex
+         findIndex: createMethod$1(6)
+       };
+
+       var $forEach = arrayIteration.forEach;
+
+       var HIDDEN = sharedKey('hidden');
+       var SYMBOL = 'Symbol';
+       var PROTOTYPE$1 = 'prototype';
+       var TO_PRIMITIVE = wellKnownSymbol('toPrimitive');
+       var setInternalState = internalState.set;
+       var getInternalState = internalState.getterFor(SYMBOL);
+       var ObjectPrototype = Object[PROTOTYPE$1];
+       var $Symbol = global_1.Symbol;
+       var $stringify = getBuiltIn('JSON', 'stringify');
+       var nativeGetOwnPropertyDescriptor$1 = objectGetOwnPropertyDescriptor.f;
+       var nativeDefineProperty$1 = objectDefineProperty.f;
+       var nativeGetOwnPropertyNames$1 = objectGetOwnPropertyNamesExternal.f;
+       var nativePropertyIsEnumerable$1 = objectPropertyIsEnumerable.f;
+       var AllSymbols = shared('symbols');
+       var ObjectPrototypeSymbols = shared('op-symbols');
+       var StringToSymbolRegistry = shared('string-to-symbol-registry');
+       var SymbolToStringRegistry = shared('symbol-to-string-registry');
+       var WellKnownSymbolsStore$1 = shared('wks');
+       var QObject = global_1.QObject;
+       // Don't use setters in Qt Script, https://github.com/zloirock/core-js/issues/173
+       var USE_SETTER = !QObject || !QObject[PROTOTYPE$1] || !QObject[PROTOTYPE$1].findChild;
+
+       // fallback for old Android, https://code.google.com/p/v8/issues/detail?id=687
+       var setSymbolDescriptor = descriptors && fails(function () {
+         return objectCreate(nativeDefineProperty$1({}, 'a', {
+           get: function () { return nativeDefineProperty$1(this, 'a', { value: 7 }).a; }
+         })).a != 7;
+       }) ? function (O, P, Attributes) {
+         var ObjectPrototypeDescriptor = nativeGetOwnPropertyDescriptor$1(ObjectPrototype, P);
+         if (ObjectPrototypeDescriptor) delete ObjectPrototype[P];
+         nativeDefineProperty$1(O, P, Attributes);
+         if (ObjectPrototypeDescriptor && O !== ObjectPrototype) {
+           nativeDefineProperty$1(ObjectPrototype, P, ObjectPrototypeDescriptor);
+         }
+       } : nativeDefineProperty$1;
+
+       var wrap = function (tag, description) {
+         var symbol = AllSymbols[tag] = objectCreate($Symbol[PROTOTYPE$1]);
+         setInternalState(symbol, {
+           type: SYMBOL,
+           tag: tag,
+           description: description
+         });
+         if (!descriptors) symbol.description = description;
+         return symbol;
        };
 
-       var bind                    = Function.prototype.bind
-         , call$1                    = Function.prototype.call
-         , keys$2                    = Object.keys
-         , objPropertyIsEnumerable = Object.prototype.propertyIsEnumerable;
-
-       var _iterate = function (method, defVal) {
-               return function (obj, cb/*, thisArg, compareFn*/) {
-                       var list, thisArg = arguments[2], compareFn = arguments[3];
-                       obj = Object(validValue(obj));
-                       validCallable(cb);
-
-                       list = keys$2(obj);
-                       if (compareFn) {
-                               list.sort(typeof compareFn === "function" ? bind.call(compareFn, obj) : undefined);
-                       }
-                       if (typeof method !== "function") method = list[method];
-                       return call$1.call(method, list, function (key, index) {
-                               if (!objPropertyIsEnumerable.call(obj, key)) return defVal;
-                               return call$1.call(cb, thisArg, obj[key], key, obj, index);
-                       });
-               };
+       var isSymbol = useSymbolAsUid ? function (it) {
+         return typeof it == 'symbol';
+       } : function (it) {
+         return Object(it) instanceof $Symbol;
        };
 
-       var forEach$1 = _iterate("forEach");
-
-       var call$2     = Function.prototype.call;
+       var $defineProperty = function defineProperty(O, P, Attributes) {
+         if (O === ObjectPrototype) $defineProperty(ObjectPrototypeSymbols, P, Attributes);
+         anObject(O);
+         var key = toPrimitive(P, true);
+         anObject(Attributes);
+         if (has(AllSymbols, key)) {
+           if (!Attributes.enumerable) {
+             if (!has(O, HIDDEN)) nativeDefineProperty$1(O, HIDDEN, createPropertyDescriptor(1, {}));
+             O[HIDDEN][key] = true;
+           } else {
+             if (has(O, HIDDEN) && O[HIDDEN][key]) O[HIDDEN][key] = false;
+             Attributes = objectCreate(Attributes, { enumerable: createPropertyDescriptor(0, false) });
+           } return setSymbolDescriptor(O, key, Attributes);
+         } return nativeDefineProperty$1(O, key, Attributes);
+       };
+
+       var $defineProperties = function defineProperties(O, Properties) {
+         anObject(O);
+         var properties = toIndexedObject(Properties);
+         var keys = objectKeys(properties).concat($getOwnPropertySymbols(properties));
+         $forEach(keys, function (key) {
+           if (!descriptors || $propertyIsEnumerable.call(properties, key)) $defineProperty(O, key, properties[key]);
+         });
+         return O;
+       };
 
-       var map$1 = function (obj, cb/*, thisArg*/) {
-               var result = {}, thisArg = arguments[2];
-               validCallable(cb);
-               forEach$1(obj, function (value, key, targetObj, index) {
-                       result[key] = call$2.call(cb, thisArg, value, key, targetObj, index);
-               });
-               return result;
+       var $create = function create(O, Properties) {
+         return Properties === undefined ? objectCreate(O) : $defineProperties(objectCreate(O), Properties);
        };
 
-       var bind$1 = Function.prototype.bind
-         , defineProperty$5 = Object.defineProperty
-         , hasOwnProperty$1 = Object.prototype.hasOwnProperty
-         , define;
-
-       define = function (name, desc, options) {
-               var value = ensure(desc) && ensure$1(desc.value), dgs;
-               dgs = copy(desc);
-               delete dgs.writable;
-               delete dgs.value;
-               dgs.get = function () {
-                       if (!options.overwriteDefinition && hasOwnProperty$1.call(this, name)) return value;
-                       desc.value = bind$1.call(value, options.resolveContext ? options.resolveContext(this) : this);
-                       defineProperty$5(this, name, desc);
-                       return this[name];
-               };
-               return dgs;
+       var $propertyIsEnumerable = function propertyIsEnumerable(V) {
+         var P = toPrimitive(V, true);
+         var enumerable = nativePropertyIsEnumerable$1.call(this, P);
+         if (this === ObjectPrototype && has(AllSymbols, P) && !has(ObjectPrototypeSymbols, P)) return false;
+         return enumerable || !has(this, P) || !has(AllSymbols, P) || has(this, HIDDEN) && this[HIDDEN][P] ? enumerable : true;
        };
 
-       var autoBind = function (props/*, options*/) {
-               var options = normalizeOptions(arguments[1]);
-               if (is(options.resolveContext)) ensure$1(options.resolveContext);
-               return map$1(props, function (desc, name) { return define(name, desc, options); });
+       var $getOwnPropertyDescriptor = function getOwnPropertyDescriptor(O, P) {
+         var it = toIndexedObject(O);
+         var key = toPrimitive(P, true);
+         if (it === ObjectPrototype && has(AllSymbols, key) && !has(ObjectPrototypeSymbols, key)) return;
+         var descriptor = nativeGetOwnPropertyDescriptor$1(it, key);
+         if (descriptor && has(AllSymbols, key) && !(has(it, HIDDEN) && it[HIDDEN][key])) {
+           descriptor.enumerable = true;
+         }
+         return descriptor;
        };
 
-       var defineProperty$6 = Object.defineProperty, defineProperties$2 = Object.defineProperties, Iterator;
-
-       var es6Iterator = Iterator = function (list, context) {
-               if (!(this instanceof Iterator)) throw new TypeError("Constructor requires 'new'");
-               defineProperties$2(this, {
-                       __list__: d_1("w", validValue(list)),
-                       __context__: d_1("w", context),
-                       __nextIndex__: d_1("w", 0)
-               });
-               if (!context) return;
-               validCallable(context.on);
-               context.on("_add", this._onAdd);
-               context.on("_delete", this._onDelete);
-               context.on("_clear", this._onClear);
+       var $getOwnPropertyNames = function getOwnPropertyNames(O) {
+         var names = nativeGetOwnPropertyNames$1(toIndexedObject(O));
+         var result = [];
+         $forEach(names, function (key) {
+           if (!has(AllSymbols, key) && !has(hiddenKeys, key)) result.push(key);
+         });
+         return result;
        };
 
-       // Internal %IteratorPrototype% doesn't expose its constructor
-       delete Iterator.prototype.constructor;
-
-       defineProperties$2(
-               Iterator.prototype,
-               assign(
-                       {
-                               _next: d_1(function () {
-                                       var i;
-                                       if (!this.__list__) return undefined;
-                                       if (this.__redo__) {
-                                               i = this.__redo__.shift();
-                                               if (i !== undefined) return i;
-                                       }
-                                       if (this.__nextIndex__ < this.__list__.length) return this.__nextIndex__++;
-                                       this._unBind();
-                                       return undefined;
-                               }),
-                               next: d_1(function () {
-                                       return this._createResult(this._next());
-                               }),
-                               _createResult: d_1(function (i) {
-                                       if (i === undefined) return { done: true, value: undefined };
-                                       return { done: false, value: this._resolve(i) };
-                               }),
-                               _resolve: d_1(function (i) {
-                                       return this.__list__[i];
-                               }),
-                               _unBind: d_1(function () {
-                                       this.__list__ = null;
-                                       delete this.__redo__;
-                                       if (!this.__context__) return;
-                                       this.__context__.off("_add", this._onAdd);
-                                       this.__context__.off("_delete", this._onDelete);
-                                       this.__context__.off("_clear", this._onClear);
-                                       this.__context__ = null;
-                               }),
-                               toString: d_1(function () {
-                                       return "[object " + (this[es6Symbol$1.toStringTag] || "Object") + "]";
-                               })
-                       },
-                       autoBind({
-                               _onAdd: d_1(function (index) {
-                                       if (index >= this.__nextIndex__) return;
-                                       ++this.__nextIndex__;
-                                       if (!this.__redo__) {
-                                               defineProperty$6(this, "__redo__", d_1("c", [index]));
-                                               return;
-                                       }
-                                       this.__redo__.forEach(function (redo, i) {
-                                               if (redo >= index) this.__redo__[i] = ++redo;
-                                       }, this);
-                                       this.__redo__.push(index);
-                               }),
-                               _onDelete: d_1(function (index) {
-                                       var i;
-                                       if (index >= this.__nextIndex__) return;
-                                       --this.__nextIndex__;
-                                       if (!this.__redo__) return;
-                                       i = this.__redo__.indexOf(index);
-                                       if (i !== -1) this.__redo__.splice(i, 1);
-                                       this.__redo__.forEach(function (redo, j) {
-                                               if (redo > index) this.__redo__[j] = --redo;
-                                       }, this);
-                               }),
-                               _onClear: d_1(function () {
-                                       if (this.__redo__) clear.call(this.__redo__);
-                                       this.__nextIndex__ = 0;
-                               })
-                       })
-               )
-       );
-
-       defineProperty$6(
-               Iterator.prototype,
-               es6Symbol$1.iterator,
-               d_1(function () {
-                       return this;
-               })
-       );
-
-       var array = createCommonjsModule(function (module) {
-
-
-
-       var defineProperty = Object.defineProperty, ArrayIterator;
-
-       ArrayIterator = module.exports = function (arr, kind) {
-               if (!(this instanceof ArrayIterator)) throw new TypeError("Constructor requires 'new'");
-               es6Iterator.call(this, arr);
-               if (!kind) kind = "value";
-               else if (contains.call(kind, "key+value")) kind = "key+value";
-               else if (contains.call(kind, "key")) kind = "key";
-               else kind = "value";
-               defineProperty(this, "__kind__", d_1("", kind));
+       var $getOwnPropertySymbols = function getOwnPropertySymbols(O) {
+         var IS_OBJECT_PROTOTYPE = O === ObjectPrototype;
+         var names = nativeGetOwnPropertyNames$1(IS_OBJECT_PROTOTYPE ? ObjectPrototypeSymbols : toIndexedObject(O));
+         var result = [];
+         $forEach(names, function (key) {
+           if (has(AllSymbols, key) && (!IS_OBJECT_PROTOTYPE || has(ObjectPrototype, key))) {
+             result.push(AllSymbols[key]);
+           }
+         });
+         return result;
        };
-       if (setPrototypeOf) setPrototypeOf(ArrayIterator, es6Iterator);
 
-       // Internal %ArrayIteratorPrototype% doesn't expose its constructor
-       delete ArrayIterator.prototype.constructor;
+       // `Symbol` constructor
+       // https://tc39.github.io/ecma262/#sec-symbol-constructor
+       if (!nativeSymbol) {
+         $Symbol = function Symbol() {
+           if (this instanceof $Symbol) throw TypeError('Symbol is not a constructor');
+           var description = !arguments.length || arguments[0] === undefined ? undefined : String(arguments[0]);
+           var tag = uid(description);
+           var setter = function (value) {
+             if (this === ObjectPrototype) setter.call(ObjectPrototypeSymbols, value);
+             if (has(this, HIDDEN) && has(this[HIDDEN], tag)) this[HIDDEN][tag] = false;
+             setSymbolDescriptor(this, tag, createPropertyDescriptor(1, value));
+           };
+           if (descriptors && USE_SETTER) setSymbolDescriptor(ObjectPrototype, tag, { configurable: true, set: setter });
+           return wrap(tag, description);
+         };
 
-       ArrayIterator.prototype = Object.create(es6Iterator.prototype, {
-               _resolve: d_1(function (i) {
-                       if (this.__kind__ === "value") return this.__list__[i];
-                       if (this.__kind__ === "key+value") return [i, this.__list__[i]];
-                       return i;
-               })
-       });
-       defineProperty(ArrayIterator.prototype, es6Symbol$1.toStringTag, d_1("c", "Array Iterator"));
-       });
+         redefine($Symbol[PROTOTYPE$1], 'toString', function toString() {
+           return getInternalState(this).tag;
+         });
 
-       var string = createCommonjsModule(function (module) {
+         redefine($Symbol, 'withoutSetter', function (description) {
+           return wrap(uid(description), description);
+         });
 
+         objectPropertyIsEnumerable.f = $propertyIsEnumerable;
+         objectDefineProperty.f = $defineProperty;
+         objectGetOwnPropertyDescriptor.f = $getOwnPropertyDescriptor;
+         objectGetOwnPropertyNames.f = objectGetOwnPropertyNamesExternal.f = $getOwnPropertyNames;
+         objectGetOwnPropertySymbols.f = $getOwnPropertySymbols;
 
+         wellKnownSymbolWrapped.f = function (name) {
+           return wrap(wellKnownSymbol(name), name);
+         };
 
-       var defineProperty = Object.defineProperty, StringIterator;
+         if (descriptors) {
+           // https://github.com/tc39/proposal-Symbol-description
+           nativeDefineProperty$1($Symbol[PROTOTYPE$1], 'description', {
+             configurable: true,
+             get: function description() {
+               return getInternalState(this).description;
+             }
+           });
+           {
+             redefine(ObjectPrototype, 'propertyIsEnumerable', $propertyIsEnumerable, { unsafe: true });
+           }
+         }
+       }
 
-       StringIterator = module.exports = function (str) {
-               if (!(this instanceof StringIterator)) throw new TypeError("Constructor requires 'new'");
-               str = String(str);
-               es6Iterator.call(this, str);
-               defineProperty(this, "__length__", d_1("", str.length));
-       };
-       if (setPrototypeOf) setPrototypeOf(StringIterator, es6Iterator);
-
-       // Internal %ArrayIteratorPrototype% doesn't expose its constructor
-       delete StringIterator.prototype.constructor;
-
-       StringIterator.prototype = Object.create(es6Iterator.prototype, {
-               _next: d_1(function () {
-                       if (!this.__list__) return undefined;
-                       if (this.__nextIndex__ < this.__length__) return this.__nextIndex__++;
-                       this._unBind();
-                       return undefined;
-               }),
-               _resolve: d_1(function (i) {
-                       var char = this.__list__[i], code;
-                       if (this.__nextIndex__ === this.__length__) return char;
-                       code = char.charCodeAt(0);
-                       if (code >= 0xd800 && code <= 0xdbff) return char + this.__list__[this.__nextIndex__++];
-                       return char;
-               })
+       _export({ global: true, wrap: true, forced: !nativeSymbol, sham: !nativeSymbol }, {
+         Symbol: $Symbol
        });
-       defineProperty(StringIterator.prototype, es6Symbol$1.toStringTag, d_1("c", "String Iterator"));
+
+       $forEach(objectKeys(WellKnownSymbolsStore$1), function (name) {
+         defineWellKnownSymbol(name);
        });
 
-       var iteratorSymbol$2 = es6Symbol$1.iterator;
+       _export({ target: SYMBOL, stat: true, forced: !nativeSymbol }, {
+         // `Symbol.for` method
+         // https://tc39.github.io/ecma262/#sec-symbol.for
+         'for': function (key) {
+           var string = String(key);
+           if (has(StringToSymbolRegistry, string)) return StringToSymbolRegistry[string];
+           var symbol = $Symbol(string);
+           StringToSymbolRegistry[string] = symbol;
+           SymbolToStringRegistry[symbol] = string;
+           return symbol;
+         },
+         // `Symbol.keyFor` method
+         // https://tc39.github.io/ecma262/#sec-symbol.keyfor
+         keyFor: function keyFor(sym) {
+           if (!isSymbol(sym)) throw TypeError(sym + ' is not a symbol');
+           if (has(SymbolToStringRegistry, sym)) return SymbolToStringRegistry[sym];
+         },
+         useSetter: function () { USE_SETTER = true; },
+         useSimple: function () { USE_SETTER = false; }
+       });
 
-       var get = function (obj) {
-               if (typeof validIterable(obj)[iteratorSymbol$2] === "function") return obj[iteratorSymbol$2]();
-               if (isArguments(obj)) return new array(obj);
-               if (isString(obj)) return new string(obj);
-               return new array(obj);
-       };
+       _export({ target: 'Object', stat: true, forced: !nativeSymbol, sham: !descriptors }, {
+         // `Object.create` method
+         // https://tc39.github.io/ecma262/#sec-object.create
+         create: $create,
+         // `Object.defineProperty` method
+         // https://tc39.github.io/ecma262/#sec-object.defineproperty
+         defineProperty: $defineProperty,
+         // `Object.defineProperties` method
+         // https://tc39.github.io/ecma262/#sec-object.defineproperties
+         defineProperties: $defineProperties,
+         // `Object.getOwnPropertyDescriptor` method
+         // https://tc39.github.io/ecma262/#sec-object.getownpropertydescriptors
+         getOwnPropertyDescriptor: $getOwnPropertyDescriptor
+       });
 
-       var isArray$2 = Array.isArray, call$3 = Function.prototype.call, some = Array.prototype.some;
-
-       var forOf = function (iterable, cb /*, thisArg*/) {
-               var mode, thisArg = arguments[2], result, doBreak, broken, i, length, char, code;
-               if (isArray$2(iterable) || isArguments(iterable)) mode = "array";
-               else if (isString(iterable)) mode = "string";
-               else iterable = get(iterable);
-
-               validCallable(cb);
-               doBreak = function () {
-                       broken = true;
-               };
-               if (mode === "array") {
-                       some.call(iterable, function (value) {
-                               call$3.call(cb, thisArg, value, doBreak);
-                               return broken;
-                       });
-                       return;
-               }
-               if (mode === "string") {
-                       length = iterable.length;
-                       for (i = 0; i < length; ++i) {
-                               char = iterable[i];
-                               if (i + 1 < length) {
-                                       code = char.charCodeAt(0);
-                                       if (code >= 0xd800 && code <= 0xdbff) char += iterable[++i];
-                               }
-                               call$3.call(cb, thisArg, char, doBreak);
-                               if (broken) break;
-                       }
-                       return;
-               }
-               result = iterable.next();
-
-               while (!result.done) {
-                       call$3.call(cb, thisArg, result.value, doBreak);
-                       if (broken) return;
-                       result = iterable.next();
-               }
-       };
+       _export({ target: 'Object', stat: true, forced: !nativeSymbol }, {
+         // `Object.getOwnPropertyNames` method
+         // https://tc39.github.io/ecma262/#sec-object.getownpropertynames
+         getOwnPropertyNames: $getOwnPropertyNames,
+         // `Object.getOwnPropertySymbols` method
+         // https://tc39.github.io/ecma262/#sec-object.getownpropertysymbols
+         getOwnPropertySymbols: $getOwnPropertySymbols
+       });
 
-       var iterator = createCommonjsModule(function (module) {
+       // Chrome 38 and 39 `Object.getOwnPropertySymbols` fails on primitives
+       // https://bugs.chromium.org/p/v8/issues/detail?id=3443
+       _export({ target: 'Object', stat: true, forced: fails(function () { objectGetOwnPropertySymbols.f(1); }) }, {
+         getOwnPropertySymbols: function getOwnPropertySymbols(it) {
+           return objectGetOwnPropertySymbols.f(toObject(it));
+         }
+       });
 
-       var toStringTagSymbol = es6Symbol.toStringTag
+       // `JSON.stringify` method behavior with symbols
+       // https://tc39.github.io/ecma262/#sec-json.stringify
+       if ($stringify) {
+         var FORCED_JSON_STRINGIFY = !nativeSymbol || fails(function () {
+           var symbol = $Symbol();
+           // MS Edge converts symbol values to JSON as {}
+           return $stringify([symbol]) != '[null]'
+             // WebKit converts symbol values to JSON as null
+             || $stringify({ a: symbol }) != '{}'
+             // V8 throws on boxed symbols
+             || $stringify(Object(symbol)) != '{}';
+         });
 
-         , defineProperty = Object.defineProperty
-         , SetIterator;
+         _export({ target: 'JSON', stat: true, forced: FORCED_JSON_STRINGIFY }, {
+           // eslint-disable-next-line no-unused-vars
+           stringify: function stringify(it, replacer, space) {
+             var args = [it];
+             var index = 1;
+             var $replacer;
+             while (arguments.length > index) args.push(arguments[index++]);
+             $replacer = replacer;
+             if (!isObject(replacer) && it === undefined || isSymbol(it)) return; // IE8 returns string on undefined
+             if (!isArray(replacer)) replacer = function (key, value) {
+               if (typeof $replacer == 'function') value = $replacer.call(this, key, value);
+               if (!isSymbol(value)) return value;
+             };
+             args[1] = replacer;
+             return $stringify.apply(null, args);
+           }
+         });
+       }
 
-       SetIterator = module.exports = function (set, kind) {
-               if (!(this instanceof SetIterator)) return new SetIterator(set, kind);
-               es6Iterator.call(this, set.__setData__, set);
-               if (!kind) kind = 'value';
-               else if (contains.call(kind, 'key+value')) kind = 'key+value';
-               else kind = 'value';
-               defineProperty(this, '__kind__', d_1('', kind));
-       };
-       if (setPrototypeOf) setPrototypeOf(SetIterator, es6Iterator);
-
-       SetIterator.prototype = Object.create(es6Iterator.prototype, {
-               constructor: d_1(SetIterator),
-               _resolve: d_1(function (i) {
-                       if (this.__kind__ === 'value') return this.__list__[i];
-                       return [this.__list__[i], this.__list__[i]];
-               }),
-               toString: d_1(function () { return '[object Set Iterator]'; })
-       });
-       defineProperty(SetIterator.prototype, toStringTagSymbol, d_1('c', 'Set Iterator'));
-       });
+       // `Symbol.prototype[@@toPrimitive]` method
+       // https://tc39.github.io/ecma262/#sec-symbol.prototype-@@toprimitive
+       if (!$Symbol[PROTOTYPE$1][TO_PRIMITIVE]) {
+         createNonEnumerableProperty($Symbol[PROTOTYPE$1], TO_PRIMITIVE, $Symbol[PROTOTYPE$1].valueOf);
+       }
+       // `Symbol.prototype[@@toStringTag]` property
+       // https://tc39.github.io/ecma262/#sec-symbol.prototype-@@tostringtag
+       setToStringTag($Symbol, SYMBOL);
 
-       // Exports true if environment provides native `Set` implementation,
-
-       var isNativeImplemented = (function () {
-               if (typeof Set === 'undefined') return false;
-               return (Object.prototype.toString.call(Set.prototype) === '[object Set]');
-       }());
-
-       var iterator$1       = validIterable
-
-         , call$4 = Function.prototype.call
-         , defineProperty$7 = Object.defineProperty, getPrototypeOf$1 = Object.getPrototypeOf
-         , SetPoly, getValues, NativeSet;
-
-       if (isNativeImplemented) NativeSet = Set;
-
-       var polyfill$2 = SetPoly = function Set(/*iterable*/) {
-               var iterable = arguments[0], self;
-               if (!(this instanceof SetPoly)) throw new TypeError('Constructor requires \'new\'');
-               if (isNativeImplemented && setPrototypeOf) self = setPrototypeOf(new NativeSet(), getPrototypeOf$1(this));
-               else self = this;
-               if (iterable != null) iterator$1(iterable);
-               defineProperty$7(self, '__setData__', d_1('c', []));
-               if (!iterable) return self;
-               forOf(iterable, function (value) {
-                       if (eIndexOf.call(this, value) !== -1) return;
-                       this.push(value);
-               }, self.__setData__);
-               return self;
-       };
+       hiddenKeys[HIDDEN] = true;
 
-       if (isNativeImplemented) {
-               if (setPrototypeOf) setPrototypeOf(SetPoly, NativeSet);
-               SetPoly.prototype = Object.create(NativeSet.prototype, { constructor: d_1(SetPoly) });
-       }
-
-       eventEmitter(Object.defineProperties(SetPoly.prototype, {
-               add: d_1(function (value) {
-                       if (this.has(value)) return this;
-                       this.emit('_add', this.__setData__.push(value) - 1, value);
-                       return this;
-               }),
-               clear: d_1(function () {
-                       if (!this.__setData__.length) return;
-                       clear.call(this.__setData__);
-                       this.emit('_clear');
-               }),
-               delete: d_1(function (value) {
-                       var index = eIndexOf.call(this.__setData__, value);
-                       if (index === -1) return false;
-                       this.__setData__.splice(index, 1);
-                       this.emit('_delete', index, value);
-                       return true;
-               }),
-               entries: d_1(function () { return new iterator(this, 'key+value'); }),
-               forEach: d_1(function (cb/*, thisArg*/) {
-                       var thisArg = arguments[1], iterator, result, value;
-                       validCallable(cb);
-                       iterator = this.values();
-                       result = iterator._next();
-                       while (result !== undefined) {
-                               value = iterator._resolve(result);
-                               call$4.call(cb, thisArg, value, value, this);
-                               result = iterator._next();
-                       }
-               }),
-               has: d_1(function (value) {
-                       return (eIndexOf.call(this.__setData__, value) !== -1);
-               }),
-               keys: d_1(getValues = function () { return this.values(); }),
-               size: d_1.gs(function () { return this.__setData__.length; }),
-               values: d_1(function () { return new iterator(this); }),
-               toString: d_1(function () { return '[object Set]'; })
-       }));
-       defineProperty$7(SetPoly.prototype, es6Symbol.iterator, d_1(getValues));
-       defineProperty$7(SetPoly.prototype, es6Symbol.toStringTag, d_1('c', 'Set'));
-
-       var es6Set = isImplemented() ? Set : polyfill$2;
-
-       var isImplemented$b = function () {
-               var map, iterator, result;
-               if (typeof Map !== 'function') return false;
-               try {
-                       // WebKit doesn't support arguments and crashes
-                       map = new Map([['raz', 'one'], ['dwa', 'two'], ['trzy', 'three']]);
-               } catch (e) {
-                       return false;
-               }
-               if (String(map) !== '[object Map]') return false;
-               if (map.size !== 3) return false;
-               if (typeof map.clear !== 'function') return false;
-               if (typeof map.delete !== 'function') return false;
-               if (typeof map.entries !== 'function') return false;
-               if (typeof map.forEach !== 'function') return false;
-               if (typeof map.get !== 'function') return false;
-               if (typeof map.has !== 'function') return false;
-               if (typeof map.keys !== 'function') return false;
-               if (typeof map.set !== 'function') return false;
-               if (typeof map.values !== 'function') return false;
-
-               iterator = map.entries();
-               result = iterator.next();
-               if (result.done !== false) return false;
-               if (!result.value) return false;
-               if (result.value[0] !== 'raz') return false;
-               if (result.value[1] !== 'one') return false;
-
-               return true;
-       };
+       var defineProperty$2 = objectDefineProperty.f;
 
-       var forEach$2 = Array.prototype.forEach, create$6 = Object.create;
 
-       // eslint-disable-next-line no-unused-vars
-       var primitiveSet = function (arg/*, …args*/) {
-               var set = create$6(null);
-               forEach$2.call(arguments, function (name) { set[name] = true; });
-               return set;
-       };
+       var NativeSymbol = global_1.Symbol;
 
-       var iteratorKinds = primitiveSet('key',
-               'value', 'key+value');
+       if (descriptors && typeof NativeSymbol == 'function' && (!('description' in NativeSymbol.prototype) ||
+         // Safari 12 bug
+         NativeSymbol().description !== undefined
+       )) {
+         var EmptyStringDescriptionStore = {};
+         // wrap Symbol constructor for correct work with undefined description
+         var SymbolWrapper = function Symbol() {
+           var description = arguments.length < 1 || arguments[0] === undefined ? undefined : String(arguments[0]);
+           var result = this instanceof SymbolWrapper
+             ? new NativeSymbol(description)
+             // in Edge 13, String(Symbol(undefined)) === 'Symbol(undefined)'
+             : description === undefined ? NativeSymbol() : NativeSymbol(description);
+           if (description === '') EmptyStringDescriptionStore[result] = true;
+           return result;
+         };
+         copyConstructorProperties(SymbolWrapper, NativeSymbol);
+         var symbolPrototype = SymbolWrapper.prototype = NativeSymbol.prototype;
+         symbolPrototype.constructor = SymbolWrapper;
 
-       var iterator$2 = createCommonjsModule(function (module) {
+         var symbolToString = symbolPrototype.toString;
+         var native = String(NativeSymbol('test')) == 'Symbol(test)';
+         var regexp = /^Symbol\((.*)\)[^)]+$/;
+         defineProperty$2(symbolPrototype, 'description', {
+           configurable: true,
+           get: function description() {
+             var symbol = isObject(this) ? this.valueOf() : this;
+             var string = symbolToString.call(symbol);
+             if (has(EmptyStringDescriptionStore, symbol)) return '';
+             var desc = native ? string.slice(7, -1) : string.replace(regexp, '$1');
+             return desc === '' ? undefined : desc;
+           }
+         });
 
-       var toStringTagSymbol = es6Symbol$1.toStringTag
+         _export({ global: true, forced: true }, {
+           Symbol: SymbolWrapper
+         });
+       }
 
-         , defineProperties = Object.defineProperties
-         , unBind = es6Iterator.prototype._unBind
-         , MapIterator;
+       // `Symbol.iterator` well-known symbol
+       // https://tc39.github.io/ecma262/#sec-symbol.iterator
+       defineWellKnownSymbol('iterator');
 
-       MapIterator = module.exports = function (map, kind) {
-               if (!(this instanceof MapIterator)) return new MapIterator(map, kind);
-               es6Iterator.call(this, map.__mapKeysData__, map);
-               if (!kind || !iteratorKinds[kind]) kind = 'key+value';
-               defineProperties(this, {
-                       __kind__: d_1('', kind),
-                       __values__: d_1('w', map.__mapValuesData__)
-               });
+       var arrayMethodIsStrict = function (METHOD_NAME, argument) {
+         var method = [][METHOD_NAME];
+         return !!method && fails(function () {
+           // eslint-disable-next-line no-useless-call,no-throw-literal
+           method.call(null, argument || function () { throw 1; }, 1);
+         });
        };
-       if (setPrototypeOf) setPrototypeOf(MapIterator, es6Iterator);
-
-       MapIterator.prototype = Object.create(es6Iterator.prototype, {
-               constructor: d_1(MapIterator),
-               _resolve: d_1(function (i) {
-                       if (this.__kind__ === 'value') return this.__values__[i];
-                       if (this.__kind__ === 'key') return this.__list__[i];
-                       return [this.__list__[i], this.__values__[i]];
-               }),
-               _unBind: d_1(function () {
-                       this.__values__ = null;
-                       unBind.call(this);
-               }),
-               toString: d_1(function () { return '[object Map Iterator]'; })
-       });
-       Object.defineProperty(MapIterator.prototype, toStringTagSymbol,
-               d_1('c', 'Map Iterator'));
-       });
 
-       // Exports true if environment provides native `Map` implementation,
-
-       var isNativeImplemented$1 = (function () {
-               if (typeof Map === 'undefined') return false;
-               return (Object.prototype.toString.call(new Map()) === '[object Map]');
-       }());
-
-       var iterator$3       = validIterable
-
-         , call$5 = Function.prototype.call
-         , defineProperties$3 = Object.defineProperties, getPrototypeOf$2 = Object.getPrototypeOf
-         , MapPoly;
-
-       var polyfill$3 = MapPoly = function (/*iterable*/) {
-               var iterable = arguments[0], keys, values, self;
-               if (!(this instanceof MapPoly)) throw new TypeError('Constructor requires \'new\'');
-               if (isNativeImplemented$1 && setPrototypeOf && (Map !== MapPoly)) {
-                       self = setPrototypeOf(new Map(), getPrototypeOf$2(this));
-               } else {
-                       self = this;
-               }
-               if (iterable != null) iterator$3(iterable);
-               defineProperties$3(self, {
-                       __mapKeysData__: d_1('c', keys = []),
-                       __mapValuesData__: d_1('c', values = [])
-               });
-               if (!iterable) return self;
-               forOf(iterable, function (value) {
-                       var key = validValue(value)[0];
-                       value = value[1];
-                       if (eIndexOf.call(keys, key) !== -1) return;
-                       keys.push(key);
-                       values.push(value);
-               }, self);
-               return self;
-       };
+       var defineProperty$3 = Object.defineProperty;
+       var cache = {};
 
-       if (isNativeImplemented$1) {
-               if (setPrototypeOf) setPrototypeOf(MapPoly, Map);
-               MapPoly.prototype = Object.create(Map.prototype, {
-                       constructor: d_1(MapPoly)
-               });
-       }
-
-       eventEmitter(defineProperties$3(MapPoly.prototype, {
-               clear: d_1(function () {
-                       if (!this.__mapKeysData__.length) return;
-                       clear.call(this.__mapKeysData__);
-                       clear.call(this.__mapValuesData__);
-                       this.emit('_clear');
-               }),
-               delete: d_1(function (key) {
-                       var index = eIndexOf.call(this.__mapKeysData__, key);
-                       if (index === -1) return false;
-                       this.__mapKeysData__.splice(index, 1);
-                       this.__mapValuesData__.splice(index, 1);
-                       this.emit('_delete', index, key);
-                       return true;
-               }),
-               entries: d_1(function () { return new iterator$2(this, 'key+value'); }),
-               forEach: d_1(function (cb/*, thisArg*/) {
-                       var thisArg = arguments[1], iterator, result;
-                       validCallable(cb);
-                       iterator = this.entries();
-                       result = iterator._next();
-                       while (result !== undefined) {
-                               call$5.call(cb, thisArg, this.__mapValuesData__[result],
-                                       this.__mapKeysData__[result], this);
-                               result = iterator._next();
-                       }
-               }),
-               get: d_1(function (key) {
-                       var index = eIndexOf.call(this.__mapKeysData__, key);
-                       if (index === -1) return;
-                       return this.__mapValuesData__[index];
-               }),
-               has: d_1(function (key) {
-                       return (eIndexOf.call(this.__mapKeysData__, key) !== -1);
-               }),
-               keys: d_1(function () { return new iterator$2(this, 'key'); }),
-               set: d_1(function (key, value) {
-                       var index = eIndexOf.call(this.__mapKeysData__, key), emit;
-                       if (index === -1) {
-                               index = this.__mapKeysData__.push(key) - 1;
-                               emit = true;
-                       }
-                       this.__mapValuesData__[index] = value;
-                       if (emit) this.emit('_add', index, key);
-                       return this;
-               }),
-               size: d_1.gs(function () { return this.__mapKeysData__.length; }),
-               values: d_1(function () { return new iterator$2(this, 'value'); }),
-               toString: d_1(function () { return '[object Map]'; })
-       }));
-       Object.defineProperty(MapPoly.prototype, es6Symbol$1.iterator, d_1(function () {
-               return this.entries();
-       }));
-       Object.defineProperty(MapPoly.prototype, es6Symbol$1.toStringTag, d_1('c', 'Map'));
-
-       var es6Map = isImplemented$b() ? Map : polyfill$3;
-
-       var toStr = Object.prototype.toString;
-
-       var isArguments$1 = function isArguments(value) {
-               var str = toStr.call(value);
-               var isArgs = str === '[object Arguments]';
-               if (!isArgs) {
-                       isArgs = str !== '[object Array]' &&
-                               value !== null &&
-                               typeof value === 'object' &&
-                               typeof value.length === 'number' &&
-                               value.length >= 0 &&
-                               toStr.call(value.callee) === '[object Function]';
-               }
-               return isArgs;
-       };
+       var thrower = function (it) { throw it; };
 
-       var keysShim;
-       if (!Object.keys) {
-               // modified from https://github.com/es-shims/es5-shim
-               var has = Object.prototype.hasOwnProperty;
-               var toStr$1 = Object.prototype.toString;
-               var isArgs = isArguments$1; // eslint-disable-line global-require
-               var isEnumerable = Object.prototype.propertyIsEnumerable;
-               var hasDontEnumBug = !isEnumerable.call({ toString: null }, 'toString');
-               var hasProtoEnumBug = isEnumerable.call(function () {}, 'prototype');
-               var dontEnums = [
-                       'toString',
-                       'toLocaleString',
-                       'valueOf',
-                       'hasOwnProperty',
-                       'isPrototypeOf',
-                       'propertyIsEnumerable',
-                       'constructor'
-               ];
-               var equalsConstructorPrototype = function (o) {
-                       var ctor = o.constructor;
-                       return ctor && ctor.prototype === o;
-               };
-               var excludedKeys = {
-                       $applicationCache: true,
-                       $console: true,
-                       $external: true,
-                       $frame: true,
-                       $frameElement: true,
-                       $frames: true,
-                       $innerHeight: true,
-                       $innerWidth: true,
-                       $onmozfullscreenchange: true,
-                       $onmozfullscreenerror: true,
-                       $outerHeight: true,
-                       $outerWidth: true,
-                       $pageXOffset: true,
-                       $pageYOffset: true,
-                       $parent: true,
-                       $scrollLeft: true,
-                       $scrollTop: true,
-                       $scrollX: true,
-                       $scrollY: true,
-                       $self: true,
-                       $webkitIndexedDB: true,
-                       $webkitStorageInfo: true,
-                       $window: true
-               };
-               var hasAutomationEqualityBug = (function () {
-                       /* global window */
-                       if (typeof window === 'undefined') { return false; }
-                       for (var k in window) {
-                               try {
-                                       if (!excludedKeys['$' + k] && has.call(window, k) && window[k] !== null && typeof window[k] === 'object') {
-                                               try {
-                                                       equalsConstructorPrototype(window[k]);
-                                               } catch (e) {
-                                                       return true;
-                                               }
-                                       }
-                               } catch (e) {
-                                       return true;
-                               }
-                       }
-                       return false;
-               }());
-               var equalsConstructorPrototypeIfNotBuggy = function (o) {
-                       /* global window */
-                       if (typeof window === 'undefined' || !hasAutomationEqualityBug) {
-                               return equalsConstructorPrototype(o);
-                       }
-                       try {
-                               return equalsConstructorPrototype(o);
-                       } catch (e) {
-                               return false;
-                       }
-               };
+       var arrayMethodUsesToLength = function (METHOD_NAME, options) {
+         if (has(cache, METHOD_NAME)) return cache[METHOD_NAME];
+         if (!options) options = {};
+         var method = [][METHOD_NAME];
+         var ACCESSORS = has(options, 'ACCESSORS') ? options.ACCESSORS : false;
+         var argument0 = has(options, 0) ? options[0] : thrower;
+         var argument1 = has(options, 1) ? options[1] : undefined;
 
-               keysShim = function keys(object) {
-                       var isObject = object !== null && typeof object === 'object';
-                       var isFunction = toStr$1.call(object) === '[object Function]';
-                       var isArguments = isArgs(object);
-                       var isString = isObject && toStr$1.call(object) === '[object String]';
-                       var theKeys = [];
+         return cache[METHOD_NAME] = !!method && !fails(function () {
+           if (ACCESSORS && !descriptors) return true;
+           var O = { length: -1 };
 
-                       if (!isObject && !isFunction && !isArguments) {
-                               throw new TypeError('Object.keys called on a non-object');
-                       }
+           if (ACCESSORS) defineProperty$3(O, 1, { enumerable: true, get: thrower });
+           else O[1] = 1;
 
-                       var skipProto = hasProtoEnumBug && isFunction;
-                       if (isString && object.length > 0 && !has.call(object, 0)) {
-                               for (var i = 0; i < object.length; ++i) {
-                                       theKeys.push(String(i));
-                               }
-                       }
+           method.call(O, argument0, argument1);
+         });
+       };
 
-                       if (isArguments && object.length > 0) {
-                               for (var j = 0; j < object.length; ++j) {
-                                       theKeys.push(String(j));
-                               }
-                       } else {
-                               for (var name in object) {
-                                       if (!(skipProto && name === 'prototype') && has.call(object, name)) {
-                                               theKeys.push(String(name));
-                                       }
-                               }
-                       }
+       var $forEach$1 = arrayIteration.forEach;
 
-                       if (hasDontEnumBug) {
-                               var skipConstructor = equalsConstructorPrototypeIfNotBuggy(object);
 
-                               for (var k = 0; k < dontEnums.length; ++k) {
-                                       if (!(skipConstructor && dontEnums[k] === 'constructor') && has.call(object, dontEnums[k])) {
-                                               theKeys.push(dontEnums[k]);
-                                       }
-                               }
-                       }
-                       return theKeys;
-               };
-       }
-       var implementation$1 = keysShim;
 
-       var slice = Array.prototype.slice;
+       var STRICT_METHOD = arrayMethodIsStrict('forEach');
+       var USES_TO_LENGTH = arrayMethodUsesToLength('forEach');
 
+       // `Array.prototype.forEach` method implementation
+       // https://tc39.github.io/ecma262/#sec-array.prototype.foreach
+       var arrayForEach = (!STRICT_METHOD || !USES_TO_LENGTH) ? function forEach(callbackfn /* , thisArg */) {
+         return $forEach$1(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
+       } : [].forEach;
 
-       var origKeys = Object.keys;
-       var keysShim$1 = origKeys ? function keys(o) { return origKeys(o); } : implementation$1;
+       // `Array.prototype.forEach` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.foreach
+       _export({ target: 'Array', proto: true, forced: [].forEach != arrayForEach }, {
+         forEach: arrayForEach
+       });
 
-       var originalKeys = Object.keys;
+       var $indexOf = arrayIncludes.indexOf;
 
-       keysShim$1.shim = function shimObjectKeys() {
-               if (Object.keys) {
-                       var keysWorksWithArguments = (function () {
-                               // Safari 5.0 bug
-                               var args = Object.keys(arguments);
-                               return args && args.length === arguments.length;
-                       }(1, 2));
-                       if (!keysWorksWithArguments) {
-                               Object.keys = function keys(object) { // eslint-disable-line func-name-matching
-                                       if (isArguments$1(object)) {
-                                               return originalKeys(slice.call(object));
-                                       }
-                                       return originalKeys(object);
-                               };
-                       }
-               } else {
-                       Object.keys = keysShim$1;
-               }
-               return Object.keys || keysShim$1;
-       };
 
-       var objectKeys = keysShim$1;
 
-       var hasSymbols = typeof Symbol === 'function' && typeof Symbol('foo') === 'symbol';
+       var nativeIndexOf = [].indexOf;
 
-       var toStr$2 = Object.prototype.toString;
-       var concat = Array.prototype.concat;
-       var origDefineProperty = Object.defineProperty;
+       var NEGATIVE_ZERO = !!nativeIndexOf && 1 / [1].indexOf(1, -0) < 0;
+       var STRICT_METHOD$1 = arrayMethodIsStrict('indexOf');
+       var USES_TO_LENGTH$1 = arrayMethodUsesToLength('indexOf', { ACCESSORS: true, 1: 0 });
 
-       var isFunction$1 = function (fn) {
-               return typeof fn === 'function' && toStr$2.call(fn) === '[object Function]';
-       };
+       // `Array.prototype.indexOf` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.indexof
+       _export({ target: 'Array', proto: true, forced: NEGATIVE_ZERO || !STRICT_METHOD$1 || !USES_TO_LENGTH$1 }, {
+         indexOf: function indexOf(searchElement /* , fromIndex = 0 */) {
+           return NEGATIVE_ZERO
+             // convert -0 to +0
+             ? nativeIndexOf.apply(this, arguments) || 0
+             : $indexOf(this, searchElement, arguments.length > 1 ? arguments[1] : undefined);
+         }
+       });
 
-       var arePropertyDescriptorsSupported = function () {
-               var obj = {};
-               try {
-                       origDefineProperty(obj, 'x', { enumerable: false, value: obj });
-                       // eslint-disable-next-line no-unused-vars, no-restricted-syntax
-                       for (var _ in obj) { // jscs:ignore disallowUnusedVariables
-                               return false;
-                       }
-                       return obj.x === obj;
-               } catch (e) { /* this is IE 8. */
-                       return false;
-               }
-       };
-       var supportsDescriptors = origDefineProperty && arePropertyDescriptorsSupported();
-
-       var defineProperty$8 = function (object, name, value, predicate) {
-               if (name in object && (!isFunction$1(predicate) || !predicate())) {
-                       return;
-               }
-               if (supportsDescriptors) {
-                       origDefineProperty(object, name, {
-                               configurable: true,
-                               enumerable: false,
-                               value: value,
-                               writable: true
-                       });
-               } else {
-                       object[name] = value;
-               }
-       };
+       // `Array.isArray` method
+       // https://tc39.github.io/ecma262/#sec-array.isarray
+       _export({ target: 'Array', stat: true }, {
+         isArray: isArray
+       });
 
-       var defineProperties$4 = function (object, map) {
-               var predicates = arguments.length > 2 ? arguments[2] : {};
-               var props = objectKeys(map);
-               if (hasSymbols) {
-                       props = concat.call(props, Object.getOwnPropertySymbols(map));
-               }
-               for (var i = 0; i < props.length; i += 1) {
-                       defineProperty$8(object, props[i], map[props[i]], predicates[props[i]]);
-               }
-       };
+       var UNSCOPABLES = wellKnownSymbol('unscopables');
+       var ArrayPrototype = Array.prototype;
 
-       defineProperties$4.supportsDescriptors = !!supportsDescriptors;
+       // Array.prototype[@@unscopables]
+       // https://tc39.github.io/ecma262/#sec-array.prototype-@@unscopables
+       if (ArrayPrototype[UNSCOPABLES] == undefined) {
+         objectDefineProperty.f(ArrayPrototype, UNSCOPABLES, {
+           configurable: true,
+           value: objectCreate(null)
+         });
+       }
 
-       var defineProperties_1 = defineProperties$4;
+       // add a key to Array.prototype[@@unscopables]
+       var addToUnscopables = function (key) {
+         ArrayPrototype[UNSCOPABLES][key] = true;
+       };
 
-       /* eslint complexity: [2, 18], max-statements: [2, 33] */
-       var shams = function hasSymbols() {
-               if (typeof Symbol !== 'function' || typeof Object.getOwnPropertySymbols !== 'function') { return false; }
-               if (typeof Symbol.iterator === 'symbol') { return true; }
+       var iterators = {};
 
-               var obj = {};
-               var sym = Symbol('test');
-               var symObj = Object(sym);
-               if (typeof sym === 'string') { return false; }
+       var correctPrototypeGetter = !fails(function () {
+         function F() { /* empty */ }
+         F.prototype.constructor = null;
+         return Object.getPrototypeOf(new F()) !== F.prototype;
+       });
 
-               if (Object.prototype.toString.call(sym) !== '[object Symbol]') { return false; }
-               if (Object.prototype.toString.call(symObj) !== '[object Symbol]') { return false; }
+       var IE_PROTO$1 = sharedKey('IE_PROTO');
+       var ObjectPrototype$1 = Object.prototype;
 
-               // temp disabled per https://github.com/ljharb/object.assign/issues/17
-               // if (sym instanceof Symbol) { return false; }
-               // temp disabled per https://github.com/WebReflection/get-own-property-symbols/issues/4
-               // if (!(symObj instanceof Symbol)) { return false; }
+       // `Object.getPrototypeOf` method
+       // https://tc39.github.io/ecma262/#sec-object.getprototypeof
+       var objectGetPrototypeOf = correctPrototypeGetter ? Object.getPrototypeOf : function (O) {
+         O = toObject(O);
+         if (has(O, IE_PROTO$1)) return O[IE_PROTO$1];
+         if (typeof O.constructor == 'function' && O instanceof O.constructor) {
+           return O.constructor.prototype;
+         } return O instanceof Object ? ObjectPrototype$1 : null;
+       };
 
-               // if (typeof Symbol.prototype.toString !== 'function') { return false; }
-               // if (String(sym) !== Symbol.prototype.toString.call(sym)) { return false; }
+       var ITERATOR = wellKnownSymbol('iterator');
+       var BUGGY_SAFARI_ITERATORS = false;
 
-               var symVal = 42;
-               obj[sym] = symVal;
-               for (sym in obj) { return false; } // eslint-disable-line no-restricted-syntax
-               if (typeof Object.keys === 'function' && Object.keys(obj).length !== 0) { return false; }
+       var returnThis = function () { return this; };
 
-               if (typeof Object.getOwnPropertyNames === 'function' && Object.getOwnPropertyNames(obj).length !== 0) { return false; }
+       // `%IteratorPrototype%` object
+       // https://tc39.github.io/ecma262/#sec-%iteratorprototype%-object
+       var IteratorPrototype, PrototypeOfArrayIteratorPrototype, arrayIterator;
 
-               var syms = Object.getOwnPropertySymbols(obj);
-               if (syms.length !== 1 || syms[0] !== sym) { return false; }
+       if ([].keys) {
+         arrayIterator = [].keys();
+         // Safari 8 has buggy iterators w/o `next`
+         if (!('next' in arrayIterator)) BUGGY_SAFARI_ITERATORS = true;
+         else {
+           PrototypeOfArrayIteratorPrototype = objectGetPrototypeOf(objectGetPrototypeOf(arrayIterator));
+           if (PrototypeOfArrayIteratorPrototype !== Object.prototype) IteratorPrototype = PrototypeOfArrayIteratorPrototype;
+         }
+       }
 
-               if (!Object.prototype.propertyIsEnumerable.call(obj, sym)) { return false; }
+       if (IteratorPrototype == undefined) IteratorPrototype = {};
 
-               if (typeof Object.getOwnPropertyDescriptor === 'function') {
-                       var descriptor = Object.getOwnPropertyDescriptor(obj, sym);
-                       if (descriptor.value !== symVal || descriptor.enumerable !== true) { return false; }
-               }
+       // 25.1.2.1.1 %IteratorPrototype%[@@iterator]()
+       if ( !has(IteratorPrototype, ITERATOR)) {
+         createNonEnumerableProperty(IteratorPrototype, ITERATOR, returnThis);
+       }
 
-               return true;
+       var iteratorsCore = {
+         IteratorPrototype: IteratorPrototype,
+         BUGGY_SAFARI_ITERATORS: BUGGY_SAFARI_ITERATORS
        };
 
-       var origSymbol = commonjsGlobal.Symbol;
-
-
-       var hasSymbols$1 = function hasNativeSymbols() {
-               if (typeof origSymbol !== 'function') { return false; }
-               if (typeof Symbol !== 'function') { return false; }
-               if (typeof origSymbol('foo') !== 'symbol') { return false; }
-               if (typeof Symbol('bar') !== 'symbol') { return false; }
+       var IteratorPrototype$1 = iteratorsCore.IteratorPrototype;
 
-               return shams();
-       };
 
-       /* eslint no-invalid-this: 1 */
-
-       var ERROR_MESSAGE = 'Function.prototype.bind called on incompatible ';
-       var slice$1 = Array.prototype.slice;
-       var toStr$3 = Object.prototype.toString;
-       var funcType = '[object Function]';
-
-       var implementation$2 = function bind(that) {
-           var target = this;
-           if (typeof target !== 'function' || toStr$3.call(target) !== funcType) {
-               throw new TypeError(ERROR_MESSAGE + target);
-           }
-           var args = slice$1.call(arguments, 1);
-
-           var bound;
-           var binder = function () {
-               if (this instanceof bound) {
-                   var result = target.apply(
-                       this,
-                       args.concat(slice$1.call(arguments))
-                   );
-                   if (Object(result) === result) {
-                       return result;
-                   }
-                   return this;
-               } else {
-                   return target.apply(
-                       that,
-                       args.concat(slice$1.call(arguments))
-                   );
-               }
-           };
 
-           var boundLength = Math.max(0, target.length - args.length);
-           var boundArgs = [];
-           for (var i = 0; i < boundLength; i++) {
-               boundArgs.push('$' + i);
-           }
 
-           bound = Function('binder', 'return function (' + boundArgs.join(',') + '){ return binder.apply(this,arguments); }')(binder);
 
-           if (target.prototype) {
-               var Empty = function Empty() {};
-               Empty.prototype = target.prototype;
-               bound.prototype = new Empty();
-               Empty.prototype = null;
-           }
+       var returnThis$1 = function () { return this; };
 
-           return bound;
+       var createIteratorConstructor = function (IteratorConstructor, NAME, next) {
+         var TO_STRING_TAG = NAME + ' Iterator';
+         IteratorConstructor.prototype = objectCreate(IteratorPrototype$1, { next: createPropertyDescriptor(1, next) });
+         setToStringTag(IteratorConstructor, TO_STRING_TAG, false);
+         iterators[TO_STRING_TAG] = returnThis$1;
+         return IteratorConstructor;
        };
 
-       var functionBind = Function.prototype.bind || implementation$2;
-
-       /* globals
-               Atomics,
-               SharedArrayBuffer,
-       */
-
-       var undefined$1;
-
-       var $TypeError = TypeError;
-
-       var $gOPD = Object.getOwnPropertyDescriptor;
-       if ($gOPD) {
-               try {
-                       $gOPD({}, '');
-               } catch (e) {
-                       $gOPD = null; // this is IE 8, which has a broken gOPD
-               }
-       }
-
-       var throwTypeError = function () { throw new $TypeError(); };
-       var ThrowTypeError = $gOPD
-               ? (function () {
-                       try {
-                               // eslint-disable-next-line no-unused-expressions, no-caller, no-restricted-properties
-                               arguments.callee; // IE 8 does not throw here
-                               return throwTypeError;
-                       } catch (calleeThrows) {
-                               try {
-                                       // IE 8 throws on Object.getOwnPropertyDescriptor(arguments, '')
-                                       return $gOPD(arguments, 'callee').get;
-                               } catch (gOPDthrows) {
-                                       return throwTypeError;
-                               }
-                       }
-               }())
-               : throwTypeError;
-
-       var hasSymbols$2 = hasSymbols$1();
-
-       var getProto = Object.getPrototypeOf || function (x) { return x.__proto__; }; // eslint-disable-line no-proto
-       var generatorFunction =  undefined$1;
-       var asyncFunction =  undefined$1;
-       var asyncGenFunction =  undefined$1;
-
-       var TypedArray = typeof Uint8Array === 'undefined' ? undefined$1 : getProto(Uint8Array);
-
-       var INTRINSICS = {
-               '%Array%': Array,
-               '%ArrayBuffer%': typeof ArrayBuffer === 'undefined' ? undefined$1 : ArrayBuffer,
-               '%ArrayBufferPrototype%': typeof ArrayBuffer === 'undefined' ? undefined$1 : ArrayBuffer.prototype,
-               '%ArrayIteratorPrototype%': hasSymbols$2 ? getProto([][Symbol.iterator]()) : undefined$1,
-               '%ArrayPrototype%': Array.prototype,
-               '%ArrayProto_entries%': Array.prototype.entries,
-               '%ArrayProto_forEach%': Array.prototype.forEach,
-               '%ArrayProto_keys%': Array.prototype.keys,
-               '%ArrayProto_values%': Array.prototype.values,
-               '%AsyncFromSyncIteratorPrototype%': undefined$1,
-               '%AsyncFunction%': asyncFunction,
-               '%AsyncFunctionPrototype%':  undefined$1,
-               '%AsyncGenerator%':  undefined$1,
-               '%AsyncGeneratorFunction%': asyncGenFunction,
-               '%AsyncGeneratorPrototype%':  undefined$1,
-               '%AsyncIteratorPrototype%':  undefined$1,
-               '%Atomics%': typeof Atomics === 'undefined' ? undefined$1 : Atomics,
-               '%Boolean%': Boolean,
-               '%BooleanPrototype%': Boolean.prototype,
-               '%DataView%': typeof DataView === 'undefined' ? undefined$1 : DataView,
-               '%DataViewPrototype%': typeof DataView === 'undefined' ? undefined$1 : DataView.prototype,
-               '%Date%': Date,
-               '%DatePrototype%': Date.prototype,
-               '%decodeURI%': decodeURI,
-               '%decodeURIComponent%': decodeURIComponent,
-               '%encodeURI%': encodeURI,
-               '%encodeURIComponent%': encodeURIComponent,
-               '%Error%': Error,
-               '%ErrorPrototype%': Error.prototype,
-               '%eval%': eval, // eslint-disable-line no-eval
-               '%EvalError%': EvalError,
-               '%EvalErrorPrototype%': EvalError.prototype,
-               '%Float32Array%': typeof Float32Array === 'undefined' ? undefined$1 : Float32Array,
-               '%Float32ArrayPrototype%': typeof Float32Array === 'undefined' ? undefined$1 : Float32Array.prototype,
-               '%Float64Array%': typeof Float64Array === 'undefined' ? undefined$1 : Float64Array,
-               '%Float64ArrayPrototype%': typeof Float64Array === 'undefined' ? undefined$1 : Float64Array.prototype,
-               '%Function%': Function,
-               '%FunctionPrototype%': Function.prototype,
-               '%Generator%':  undefined$1,
-               '%GeneratorFunction%': generatorFunction,
-               '%GeneratorPrototype%':  undefined$1,
-               '%Int8Array%': typeof Int8Array === 'undefined' ? undefined$1 : Int8Array,
-               '%Int8ArrayPrototype%': typeof Int8Array === 'undefined' ? undefined$1 : Int8Array.prototype,
-               '%Int16Array%': typeof Int16Array === 'undefined' ? undefined$1 : Int16Array,
-               '%Int16ArrayPrototype%': typeof Int16Array === 'undefined' ? undefined$1 : Int8Array.prototype,
-               '%Int32Array%': typeof Int32Array === 'undefined' ? undefined$1 : Int32Array,
-               '%Int32ArrayPrototype%': typeof Int32Array === 'undefined' ? undefined$1 : Int32Array.prototype,
-               '%isFinite%': isFinite,
-               '%isNaN%': isNaN,
-               '%IteratorPrototype%': hasSymbols$2 ? getProto(getProto([][Symbol.iterator]())) : undefined$1,
-               '%JSON%': typeof JSON === 'object' ? JSON : undefined$1,
-               '%JSONParse%': typeof JSON === 'object' ? JSON.parse : undefined$1,
-               '%Map%': typeof Map === 'undefined' ? undefined$1 : Map,
-               '%MapIteratorPrototype%': typeof Map === 'undefined' || !hasSymbols$2 ? undefined$1 : getProto(new Map()[Symbol.iterator]()),
-               '%MapPrototype%': typeof Map === 'undefined' ? undefined$1 : Map.prototype,
-               '%Math%': Math,
-               '%Number%': Number,
-               '%NumberPrototype%': Number.prototype,
-               '%Object%': Object,
-               '%ObjectPrototype%': Object.prototype,
-               '%ObjProto_toString%': Object.prototype.toString,
-               '%ObjProto_valueOf%': Object.prototype.valueOf,
-               '%parseFloat%': parseFloat,
-               '%parseInt%': parseInt,
-               '%Promise%': typeof Promise === 'undefined' ? undefined$1 : Promise,
-               '%PromisePrototype%': typeof Promise === 'undefined' ? undefined$1 : Promise.prototype,
-               '%PromiseProto_then%': typeof Promise === 'undefined' ? undefined$1 : Promise.prototype.then,
-               '%Promise_all%': typeof Promise === 'undefined' ? undefined$1 : Promise.all,
-               '%Promise_reject%': typeof Promise === 'undefined' ? undefined$1 : Promise.reject,
-               '%Promise_resolve%': typeof Promise === 'undefined' ? undefined$1 : Promise.resolve,
-               '%Proxy%': typeof Proxy === 'undefined' ? undefined$1 : Proxy,
-               '%RangeError%': RangeError,
-               '%RangeErrorPrototype%': RangeError.prototype,
-               '%ReferenceError%': ReferenceError,
-               '%ReferenceErrorPrototype%': ReferenceError.prototype,
-               '%Reflect%': typeof Reflect === 'undefined' ? undefined$1 : Reflect,
-               '%RegExp%': RegExp,
-               '%RegExpPrototype%': RegExp.prototype,
-               '%Set%': typeof Set === 'undefined' ? undefined$1 : Set,
-               '%SetIteratorPrototype%': typeof Set === 'undefined' || !hasSymbols$2 ? undefined$1 : getProto(new Set()[Symbol.iterator]()),
-               '%SetPrototype%': typeof Set === 'undefined' ? undefined$1 : Set.prototype,
-               '%SharedArrayBuffer%': typeof SharedArrayBuffer === 'undefined' ? undefined$1 : SharedArrayBuffer,
-               '%SharedArrayBufferPrototype%': typeof SharedArrayBuffer === 'undefined' ? undefined$1 : SharedArrayBuffer.prototype,
-               '%String%': String,
-               '%StringIteratorPrototype%': hasSymbols$2 ? getProto(''[Symbol.iterator]()) : undefined$1,
-               '%StringPrototype%': String.prototype,
-               '%Symbol%': hasSymbols$2 ? Symbol : undefined$1,
-               '%SymbolPrototype%': hasSymbols$2 ? Symbol.prototype : undefined$1,
-               '%SyntaxError%': SyntaxError,
-               '%SyntaxErrorPrototype%': SyntaxError.prototype,
-               '%ThrowTypeError%': ThrowTypeError,
-               '%TypedArray%': TypedArray,
-               '%TypedArrayPrototype%': TypedArray ? TypedArray.prototype : undefined$1,
-               '%TypeError%': $TypeError,
-               '%TypeErrorPrototype%': $TypeError.prototype,
-               '%Uint8Array%': typeof Uint8Array === 'undefined' ? undefined$1 : Uint8Array,
-               '%Uint8ArrayPrototype%': typeof Uint8Array === 'undefined' ? undefined$1 : Uint8Array.prototype,
-               '%Uint8ClampedArray%': typeof Uint8ClampedArray === 'undefined' ? undefined$1 : Uint8ClampedArray,
-               '%Uint8ClampedArrayPrototype%': typeof Uint8ClampedArray === 'undefined' ? undefined$1 : Uint8ClampedArray.prototype,
-               '%Uint16Array%': typeof Uint16Array === 'undefined' ? undefined$1 : Uint16Array,
-               '%Uint16ArrayPrototype%': typeof Uint16Array === 'undefined' ? undefined$1 : Uint16Array.prototype,
-               '%Uint32Array%': typeof Uint32Array === 'undefined' ? undefined$1 : Uint32Array,
-               '%Uint32ArrayPrototype%': typeof Uint32Array === 'undefined' ? undefined$1 : Uint32Array.prototype,
-               '%URIError%': URIError,
-               '%URIErrorPrototype%': URIError.prototype,
-               '%WeakMap%': typeof WeakMap === 'undefined' ? undefined$1 : WeakMap,
-               '%WeakMapPrototype%': typeof WeakMap === 'undefined' ? undefined$1 : WeakMap.prototype,
-               '%WeakSet%': typeof WeakSet === 'undefined' ? undefined$1 : WeakSet,
-               '%WeakSetPrototype%': typeof WeakSet === 'undefined' ? undefined$1 : WeakSet.prototype
+       var aPossiblePrototype = function (it) {
+         if (!isObject(it) && it !== null) {
+           throw TypeError("Can't set " + String(it) + ' as a prototype');
+         } return it;
        };
 
+       // `Object.setPrototypeOf` method
+       // https://tc39.github.io/ecma262/#sec-object.setprototypeof
+       // Works with __proto__ only. Old v8 can't work with null proto objects.
+       /* eslint-disable no-proto */
+       var objectSetPrototypeOf = Object.setPrototypeOf || ('__proto__' in {} ? function () {
+         var CORRECT_SETTER = false;
+         var test = {};
+         var setter;
+         try {
+           setter = Object.getOwnPropertyDescriptor(Object.prototype, '__proto__').set;
+           setter.call(test, []);
+           CORRECT_SETTER = test instanceof Array;
+         } catch (error) { /* empty */ }
+         return function setPrototypeOf(O, proto) {
+           anObject(O);
+           aPossiblePrototype(proto);
+           if (CORRECT_SETTER) setter.call(O, proto);
+           else O.__proto__ = proto;
+           return O;
+         };
+       }() : undefined);
+
+       var IteratorPrototype$2 = iteratorsCore.IteratorPrototype;
+       var BUGGY_SAFARI_ITERATORS$1 = iteratorsCore.BUGGY_SAFARI_ITERATORS;
+       var ITERATOR$1 = wellKnownSymbol('iterator');
+       var KEYS = 'keys';
+       var VALUES = 'values';
+       var ENTRIES = 'entries';
+
+       var returnThis$2 = function () { return this; };
+
+       var defineIterator = function (Iterable, NAME, IteratorConstructor, next, DEFAULT, IS_SET, FORCED) {
+         createIteratorConstructor(IteratorConstructor, NAME, next);
+
+         var getIterationMethod = function (KIND) {
+           if (KIND === DEFAULT && defaultIterator) return defaultIterator;
+           if (!BUGGY_SAFARI_ITERATORS$1 && KIND in IterablePrototype) return IterablePrototype[KIND];
+           switch (KIND) {
+             case KEYS: return function keys() { return new IteratorConstructor(this, KIND); };
+             case VALUES: return function values() { return new IteratorConstructor(this, KIND); };
+             case ENTRIES: return function entries() { return new IteratorConstructor(this, KIND); };
+           } return function () { return new IteratorConstructor(this); };
+         };
+
+         var TO_STRING_TAG = NAME + ' Iterator';
+         var INCORRECT_VALUES_NAME = false;
+         var IterablePrototype = Iterable.prototype;
+         var nativeIterator = IterablePrototype[ITERATOR$1]
+           || IterablePrototype['@@iterator']
+           || DEFAULT && IterablePrototype[DEFAULT];
+         var defaultIterator = !BUGGY_SAFARI_ITERATORS$1 && nativeIterator || getIterationMethod(DEFAULT);
+         var anyNativeIterator = NAME == 'Array' ? IterablePrototype.entries || nativeIterator : nativeIterator;
+         var CurrentIteratorPrototype, methods, KEY;
+
+         // fix native
+         if (anyNativeIterator) {
+           CurrentIteratorPrototype = objectGetPrototypeOf(anyNativeIterator.call(new Iterable()));
+           if (IteratorPrototype$2 !== Object.prototype && CurrentIteratorPrototype.next) {
+             if ( objectGetPrototypeOf(CurrentIteratorPrototype) !== IteratorPrototype$2) {
+               if (objectSetPrototypeOf) {
+                 objectSetPrototypeOf(CurrentIteratorPrototype, IteratorPrototype$2);
+               } else if (typeof CurrentIteratorPrototype[ITERATOR$1] != 'function') {
+                 createNonEnumerableProperty(CurrentIteratorPrototype, ITERATOR$1, returnThis$2);
+               }
+             }
+             // Set @@toStringTag to native iterators
+             setToStringTag(CurrentIteratorPrototype, TO_STRING_TAG, true);
+           }
+         }
+
+         // fix Array#{values, @@iterator}.name in V8 / FF
+         if (DEFAULT == VALUES && nativeIterator && nativeIterator.name !== VALUES) {
+           INCORRECT_VALUES_NAME = true;
+           defaultIterator = function values() { return nativeIterator.call(this); };
+         }
+
+         // define iterator
+         if ( IterablePrototype[ITERATOR$1] !== defaultIterator) {
+           createNonEnumerableProperty(IterablePrototype, ITERATOR$1, defaultIterator);
+         }
+         iterators[NAME] = defaultIterator;
+
+         // export additional methods
+         if (DEFAULT) {
+           methods = {
+             values: getIterationMethod(VALUES),
+             keys: IS_SET ? defaultIterator : getIterationMethod(KEYS),
+             entries: getIterationMethod(ENTRIES)
+           };
+           if (FORCED) for (KEY in methods) {
+             if (BUGGY_SAFARI_ITERATORS$1 || INCORRECT_VALUES_NAME || !(KEY in IterablePrototype)) {
+               redefine(IterablePrototype, KEY, methods[KEY]);
+             }
+           } else _export({ target: NAME, proto: true, forced: BUGGY_SAFARI_ITERATORS$1 || INCORRECT_VALUES_NAME }, methods);
+         }
+
+         return methods;
+       };
+
+       var ARRAY_ITERATOR = 'Array Iterator';
+       var setInternalState$1 = internalState.set;
+       var getInternalState$1 = internalState.getterFor(ARRAY_ITERATOR);
+
+       // `Array.prototype.entries` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.entries
+       // `Array.prototype.keys` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.keys
+       // `Array.prototype.values` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.values
+       // `Array.prototype[@@iterator]` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype-@@iterator
+       // `CreateArrayIterator` internal method
+       // https://tc39.github.io/ecma262/#sec-createarrayiterator
+       var es_array_iterator = defineIterator(Array, 'Array', function (iterated, kind) {
+         setInternalState$1(this, {
+           type: ARRAY_ITERATOR,
+           target: toIndexedObject(iterated), // target
+           index: 0,                          // next index
+           kind: kind                         // kind
+         });
+       // `%ArrayIteratorPrototype%.next` method
+       // https://tc39.github.io/ecma262/#sec-%arrayiteratorprototype%.next
+       }, function () {
+         var state = getInternalState$1(this);
+         var target = state.target;
+         var kind = state.kind;
+         var index = state.index++;
+         if (!target || index >= target.length) {
+           state.target = undefined;
+           return { value: undefined, done: true };
+         }
+         if (kind == 'keys') return { value: index, done: false };
+         if (kind == 'values') return { value: target[index], done: false };
+         return { value: [index, target[index]], done: false };
+       }, 'values');
+
+       // argumentsList[@@iterator] is %ArrayProto_values%
+       // https://tc39.github.io/ecma262/#sec-createunmappedargumentsobject
+       // https://tc39.github.io/ecma262/#sec-createmappedargumentsobject
+       iterators.Arguments = iterators.Array;
+
+       // https://tc39.github.io/ecma262/#sec-array.prototype-@@unscopables
+       addToUnscopables('keys');
+       addToUnscopables('values');
+       addToUnscopables('entries');
+
+       var nativeJoin = [].join;
+
+       var ES3_STRINGS = indexedObject != Object;
+       var STRICT_METHOD$2 = arrayMethodIsStrict('join', ',');
+
+       // `Array.prototype.join` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.join
+       _export({ target: 'Array', proto: true, forced: ES3_STRINGS || !STRICT_METHOD$2 }, {
+         join: function join(separator) {
+           return nativeJoin.call(toIndexedObject(this), separator === undefined ? ',' : separator);
+         }
+       });
 
-       var $replace = functionBind.call(Function.call, String.prototype.replace);
+       var engineUserAgent = getBuiltIn('navigator', 'userAgent') || '';
 
-       /* adapted from https://github.com/lodash/lodash/blob/4.17.15/dist/lodash.js#L6735-L6744 */
-       var rePropName = /[^%.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]|(?=(?:\.|\[\])(?:\.|\[\]|%$))/g;
-       var reEscapeChar = /\\(\\)?/g; /** Used to match backslashes in property paths. */
-       var stringToPath = function stringToPath(string) {
-               var result = [];
-               $replace(string, rePropName, function (match, number, quote, subString) {
-                       result[result.length] = quote ? $replace(subString, reEscapeChar, '$1') : (number || match);
-               });
-               return result;
-       };
-       /* end adaptation */
+       var process$1 = global_1.process;
+       var versions = process$1 && process$1.versions;
+       var v8 = versions && versions.v8;
+       var match, version;
 
-       var getBaseIntrinsic = function getBaseIntrinsic(name, allowMissing) {
-               if (!(name in INTRINSICS)) {
-                       throw new SyntaxError('intrinsic ' + name + ' does not exist!');
-               }
+       if (v8) {
+         match = v8.split('.');
+         version = match[0] + match[1];
+       } else if (engineUserAgent) {
+         match = engineUserAgent.match(/Edge\/(\d+)/);
+         if (!match || match[1] >= 74) {
+           match = engineUserAgent.match(/Chrome\/(\d+)/);
+           if (match) version = match[1];
+         }
+       }
 
-               // istanbul ignore if // hopefully this is impossible to test :-)
-               if (typeof INTRINSICS[name] === 'undefined' && !allowMissing) {
-                       throw new $TypeError('intrinsic ' + name + ' exists, but is not available. Please file an issue!');
-               }
+       var engineV8Version = version && +version;
 
-               return INTRINSICS[name];
-       };
+       var SPECIES$1 = wellKnownSymbol('species');
 
-       var GetIntrinsic = function GetIntrinsic(name, allowMissing) {
-               if (typeof name !== 'string' || name.length === 0) {
-                       throw new TypeError('intrinsic name must be a non-empty string');
-               }
-               if (arguments.length > 1 && typeof allowMissing !== 'boolean') {
-                       throw new TypeError('"allowMissing" argument must be a boolean');
-               }
-
-               var parts = stringToPath(name);
-
-               var value = getBaseIntrinsic('%' + (parts.length > 0 ? parts[0] : '') + '%', allowMissing);
-               for (var i = 1; i < parts.length; i += 1) {
-                       if (value != null) {
-                               if ($gOPD && (i + 1) >= parts.length) {
-                                       var desc = $gOPD(value, parts[i]);
-                                       if (!allowMissing && !(parts[i] in value)) {
-                                               throw new $TypeError('base intrinsic for ' + name + ' exists, but the property is not available.');
-                                       }
-                                       value = desc ? (desc.get || desc.value) : value[parts[i]];
-                               } else {
-                                       value = value[parts[i]];
-                               }
-                       }
-               }
-               return value;
+       var arrayMethodHasSpeciesSupport = function (METHOD_NAME) {
+         // We can't use this feature detection in V8 since it causes
+         // deoptimization and serious performance degradation
+         // https://github.com/zloirock/core-js/issues/677
+         return engineV8Version >= 51 || !fails(function () {
+           var array = [];
+           var constructor = array.constructor = {};
+           constructor[SPECIES$1] = function () {
+             return { foo: 1 };
+           };
+           return array[METHOD_NAME](Boolean).foo !== 1;
+         });
        };
 
-       var $TypeError$1 = GetIntrinsic('%TypeError%');
+       var $map = arrayIteration.map;
 
-       // http://www.ecma-international.org/ecma-262/5.1/#sec-9.10
 
-       var CheckObjectCoercible = function CheckObjectCoercible(value, optMessage) {
-               if (value == null) {
-                       throw new $TypeError$1(optMessage || ('Cannot call method on ' + value));
-               }
-               return value;
-       };
-
-       var RequireObjectCoercible = CheckObjectCoercible;
 
-       var $Object = GetIntrinsic('%Object%');
+       var HAS_SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('map');
+       // FF49- issue
+       var USES_TO_LENGTH$2 = arrayMethodUsesToLength('map');
 
+       // `Array.prototype.map` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.map
+       // with adding support of @@species
+       _export({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT || !USES_TO_LENGTH$2 }, {
+         map: function map(callbackfn /* , thisArg */) {
+           return $map(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
+         }
+       });
 
+       var createProperty = function (object, key, value) {
+         var propertyKey = toPrimitive(key);
+         if (propertyKey in object) objectDefineProperty.f(object, propertyKey, createPropertyDescriptor(0, value));
+         else object[propertyKey] = value;
+       };
+
+       var HAS_SPECIES_SUPPORT$1 = arrayMethodHasSpeciesSupport('slice');
+       var USES_TO_LENGTH$3 = arrayMethodUsesToLength('slice', { ACCESSORS: true, 0: 0, 1: 2 });
+
+       var SPECIES$2 = wellKnownSymbol('species');
+       var nativeSlice = [].slice;
+       var max$1 = Math.max;
+
+       // `Array.prototype.slice` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.slice
+       // fallback for not array-like ES3 strings and DOM objects
+       _export({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT$1 || !USES_TO_LENGTH$3 }, {
+         slice: function slice(start, end) {
+           var O = toIndexedObject(this);
+           var length = toLength(O.length);
+           var k = toAbsoluteIndex(start, length);
+           var fin = toAbsoluteIndex(end === undefined ? length : end, length);
+           // inline `ArraySpeciesCreate` for usage native `Array#slice` where it's possible
+           var Constructor, result, n;
+           if (isArray(O)) {
+             Constructor = O.constructor;
+             // cross-realm fallback
+             if (typeof Constructor == 'function' && (Constructor === Array || isArray(Constructor.prototype))) {
+               Constructor = undefined;
+             } else if (isObject(Constructor)) {
+               Constructor = Constructor[SPECIES$2];
+               if (Constructor === null) Constructor = undefined;
+             }
+             if (Constructor === Array || Constructor === undefined) {
+               return nativeSlice.call(O, k, fin);
+             }
+           }
+           result = new (Constructor === undefined ? Array : Constructor)(max$1(fin - k, 0));
+           for (n = 0; k < fin; k++, n++) if (k in O) createProperty(result, n, O[k]);
+           result.length = n;
+           return result;
+         }
+       });
 
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-toobject
+       var arrayBufferNative = typeof ArrayBuffer !== 'undefined' && typeof DataView !== 'undefined';
 
-       var ToObject = function ToObject(value) {
-               RequireObjectCoercible(value);
-               return $Object(value);
+       var redefineAll = function (target, src, options) {
+         for (var key in src) redefine(target, key, src[key], options);
+         return target;
        };
 
-       var $Math = GetIntrinsic('%Math%');
-       var $Number = GetIntrinsic('%Number%');
-
-       var maxSafeInteger = $Number.MAX_SAFE_INTEGER || $Math.pow(2, 53) - 1;
-
-       // http://www.ecma-international.org/ecma-262/5.1/#sec-9.3
-
-       var ToNumber = function ToNumber(value) {
-               return +value; // eslint-disable-line no-implicit-coercion
+       var anInstance = function (it, Constructor, name) {
+         if (!(it instanceof Constructor)) {
+           throw TypeError('Incorrect ' + (name ? name + ' ' : '') + 'invocation');
+         } return it;
        };
 
-       var _isNaN = Number.isNaN || function isNaN(a) {
-               return a !== a;
+       // `ToIndex` abstract operation
+       // https://tc39.github.io/ecma262/#sec-toindex
+       var toIndex = function (it) {
+         if (it === undefined) return 0;
+         var number = toInteger(it);
+         var length = toLength(number);
+         if (number !== length) throw RangeError('Wrong length or index');
+         return length;
        };
 
-       var $isNaN = Number.isNaN || function (a) { return a !== a; };
+       // IEEE754 conversions based on https://github.com/feross/ieee754
+       // eslint-disable-next-line no-shadow-restricted-names
+       var Infinity$1 = 1 / 0;
+       var abs = Math.abs;
+       var pow = Math.pow;
+       var floor$1 = Math.floor;
+       var log = Math.log;
+       var LN2 = Math.LN2;
 
-       var _isFinite = Number.isFinite || function (x) { return typeof x === 'number' && !$isNaN(x) && x !== Infinity && x !== -Infinity; };
+       var pack = function (number, mantissaLength, bytes) {
+         var buffer = new Array(bytes);
+         var exponentLength = bytes * 8 - mantissaLength - 1;
+         var eMax = (1 << exponentLength) - 1;
+         var eBias = eMax >> 1;
+         var rt = mantissaLength === 23 ? pow(2, -24) - pow(2, -77) : 0;
+         var sign = number < 0 || number === 0 && 1 / number < 0 ? 1 : 0;
+         var index = 0;
+         var exponent, mantissa, c;
+         number = abs(number);
+         // eslint-disable-next-line no-self-compare
+         if (number != number || number === Infinity$1) {
+           // eslint-disable-next-line no-self-compare
+           mantissa = number != number ? 1 : 0;
+           exponent = eMax;
+         } else {
+           exponent = floor$1(log(number) / LN2);
+           if (number * (c = pow(2, -exponent)) < 1) {
+             exponent--;
+             c *= 2;
+           }
+           if (exponent + eBias >= 1) {
+             number += rt / c;
+           } else {
+             number += rt * pow(2, 1 - eBias);
+           }
+           if (number * c >= 2) {
+             exponent++;
+             c /= 2;
+           }
+           if (exponent + eBias >= eMax) {
+             mantissa = 0;
+             exponent = eMax;
+           } else if (exponent + eBias >= 1) {
+             mantissa = (number * c - 1) * pow(2, mantissaLength);
+             exponent = exponent + eBias;
+           } else {
+             mantissa = number * pow(2, eBias - 1) * pow(2, mantissaLength);
+             exponent = 0;
+           }
+         }
+         for (; mantissaLength >= 8; buffer[index++] = mantissa & 255, mantissa /= 256, mantissaLength -= 8);
+         exponent = exponent << mantissaLength | mantissa;
+         exponentLength += mantissaLength;
+         for (; exponentLength > 0; buffer[index++] = exponent & 255, exponent /= 256, exponentLength -= 8);
+         buffer[--index] |= sign * 128;
+         return buffer;
+       };
 
-       var sign$1 = function sign(number) {
-               return number >= 0 ? 1 : -1;
+       var unpack = function (buffer, mantissaLength) {
+         var bytes = buffer.length;
+         var exponentLength = bytes * 8 - mantissaLength - 1;
+         var eMax = (1 << exponentLength) - 1;
+         var eBias = eMax >> 1;
+         var nBits = exponentLength - 7;
+         var index = bytes - 1;
+         var sign = buffer[index--];
+         var exponent = sign & 127;
+         var mantissa;
+         sign >>= 7;
+         for (; nBits > 0; exponent = exponent * 256 + buffer[index], index--, nBits -= 8);
+         mantissa = exponent & (1 << -nBits) - 1;
+         exponent >>= -nBits;
+         nBits += mantissaLength;
+         for (; nBits > 0; mantissa = mantissa * 256 + buffer[index], index--, nBits -= 8);
+         if (exponent === 0) {
+           exponent = 1 - eBias;
+         } else if (exponent === eMax) {
+           return mantissa ? NaN : sign ? -Infinity$1 : Infinity$1;
+         } else {
+           mantissa = mantissa + pow(2, mantissaLength);
+           exponent = exponent - eBias;
+         } return (sign ? -1 : 1) * mantissa * pow(2, exponent - mantissaLength);
        };
 
-       var $Math$1 = GetIntrinsic('%Math%');
+       var ieee754 = {
+         pack: pack,
+         unpack: unpack
+       };
 
+       // `Array.prototype.fill` method implementation
+       // https://tc39.github.io/ecma262/#sec-array.prototype.fill
+       var arrayFill = function fill(value /* , start = 0, end = @length */) {
+         var O = toObject(this);
+         var length = toLength(O.length);
+         var argumentsLength = arguments.length;
+         var index = toAbsoluteIndex(argumentsLength > 1 ? arguments[1] : undefined, length);
+         var end = argumentsLength > 2 ? arguments[2] : undefined;
+         var endPos = end === undefined ? length : toAbsoluteIndex(end, length);
+         while (endPos > index) O[index++] = value;
+         return O;
+       };
 
+       var getOwnPropertyNames = objectGetOwnPropertyNames.f;
+       var defineProperty$4 = objectDefineProperty.f;
 
 
 
 
-       var $floor = $Math$1.floor;
-       var $abs = $Math$1.abs;
+       var getInternalState$2 = internalState.get;
+       var setInternalState$2 = internalState.set;
+       var ARRAY_BUFFER = 'ArrayBuffer';
+       var DATA_VIEW = 'DataView';
+       var PROTOTYPE$2 = 'prototype';
+       var WRONG_LENGTH = 'Wrong length';
+       var WRONG_INDEX = 'Wrong index';
+       var NativeArrayBuffer = global_1[ARRAY_BUFFER];
+       var $ArrayBuffer = NativeArrayBuffer;
+       var $DataView = global_1[DATA_VIEW];
+       var $DataViewPrototype = $DataView && $DataView[PROTOTYPE$2];
+       var ObjectPrototype$2 = Object.prototype;
+       var RangeError$1 = global_1.RangeError;
 
-       // http://www.ecma-international.org/ecma-262/5.1/#sec-9.4
+       var packIEEE754 = ieee754.pack;
+       var unpackIEEE754 = ieee754.unpack;
 
-       var ToInteger = function ToInteger(value) {
-               var number = ToNumber(value);
-               if (_isNaN(number)) { return 0; }
-               if (number === 0 || !_isFinite(number)) { return number; }
-               return sign$1(number) * $floor($abs(number));
+       var packInt8 = function (number) {
+         return [number & 0xFF];
        };
 
-       var $apply = GetIntrinsic('%Function.prototype.apply%');
-       var $call = GetIntrinsic('%Function.prototype.call%');
-       var $reflectApply = GetIntrinsic('%Reflect.apply%', true) || functionBind.call($call, $apply);
-
-       var callBind = function callBind() {
-               return $reflectApply(functionBind, $call, arguments);
+       var packInt16 = function (number) {
+         return [number & 0xFF, number >> 8 & 0xFF];
        };
 
-       var apply = function applyBind() {
-               return $reflectApply(functionBind, $apply, arguments);
+       var packInt32 = function (number) {
+         return [number & 0xFF, number >> 8 & 0xFF, number >> 16 & 0xFF, number >> 24 & 0xFF];
        };
-       callBind.apply = apply;
 
-       var $indexOf = callBind(GetIntrinsic('String.prototype.indexOf'));
-
-       var callBound = function callBoundIntrinsic(name, allowMissing) {
-               var intrinsic = GetIntrinsic(name, !!allowMissing);
-               if (typeof intrinsic === 'function' && $indexOf(name, '.prototype.')) {
-                       return callBind(intrinsic);
-               }
-               return intrinsic;
+       var unpackInt32 = function (buffer) {
+         return buffer[3] << 24 | buffer[2] << 16 | buffer[1] << 8 | buffer[0];
        };
 
-       var $test = GetIntrinsic('RegExp.prototype.test');
-
+       var packFloat32 = function (number) {
+         return packIEEE754(number, 23, 4);
+       };
 
+       var packFloat64 = function (number) {
+         return packIEEE754(number, 52, 8);
+       };
 
-       var regexTester = function regexTester(regex) {
-               return callBind($test, regex);
+       var addGetter = function (Constructor, key) {
+         defineProperty$4(Constructor[PROTOTYPE$2], key, { get: function () { return getInternalState$2(this)[key]; } });
        };
 
-       var isPrimitive = function isPrimitive(value) {
-               return value === null || (typeof value !== 'function' && typeof value !== 'object');
+       var get$1 = function (view, count, index, isLittleEndian) {
+         var intIndex = toIndex(index);
+         var store = getInternalState$2(view);
+         if (intIndex + count > store.byteLength) throw RangeError$1(WRONG_INDEX);
+         var bytes = getInternalState$2(store.buffer).bytes;
+         var start = intIndex + store.byteOffset;
+         var pack = bytes.slice(start, start + count);
+         return isLittleEndian ? pack : pack.reverse();
        };
 
-       var isPrimitive$1 = function isPrimitive(value) {
-               return value === null || (typeof value !== 'function' && typeof value !== 'object');
+       var set$1 = function (view, count, index, conversion, value, isLittleEndian) {
+         var intIndex = toIndex(index);
+         var store = getInternalState$2(view);
+         if (intIndex + count > store.byteLength) throw RangeError$1(WRONG_INDEX);
+         var bytes = getInternalState$2(store.buffer).bytes;
+         var start = intIndex + store.byteOffset;
+         var pack = conversion(+value);
+         for (var i = 0; i < count; i++) bytes[start + i] = pack[isLittleEndian ? i : count - i - 1];
        };
 
-       var fnToStr = Function.prototype.toString;
-       var reflectApply = typeof Reflect === 'object' && Reflect !== null && Reflect.apply;
-       var badArrayLike;
-       var isCallableMarker;
-       if (typeof reflectApply === 'function' && typeof Object.defineProperty === 'function') {
-               try {
-                       badArrayLike = Object.defineProperty({}, 'length', {
-                               get: function () {
-                                       throw isCallableMarker;
-                               }
-                       });
-                       isCallableMarker = {};
-               } catch (_) {
-                       reflectApply = null;
-               }
+       if (!arrayBufferNative) {
+         $ArrayBuffer = function ArrayBuffer(length) {
+           anInstance(this, $ArrayBuffer, ARRAY_BUFFER);
+           var byteLength = toIndex(length);
+           setInternalState$2(this, {
+             bytes: arrayFill.call(new Array(byteLength), 0),
+             byteLength: byteLength
+           });
+           if (!descriptors) this.byteLength = byteLength;
+         };
+
+         $DataView = function DataView(buffer, byteOffset, byteLength) {
+           anInstance(this, $DataView, DATA_VIEW);
+           anInstance(buffer, $ArrayBuffer, DATA_VIEW);
+           var bufferLength = getInternalState$2(buffer).byteLength;
+           var offset = toInteger(byteOffset);
+           if (offset < 0 || offset > bufferLength) throw RangeError$1('Wrong offset');
+           byteLength = byteLength === undefined ? bufferLength - offset : toLength(byteLength);
+           if (offset + byteLength > bufferLength) throw RangeError$1(WRONG_LENGTH);
+           setInternalState$2(this, {
+             buffer: buffer,
+             byteLength: byteLength,
+             byteOffset: offset
+           });
+           if (!descriptors) {
+             this.buffer = buffer;
+             this.byteLength = byteLength;
+             this.byteOffset = offset;
+           }
+         };
+
+         if (descriptors) {
+           addGetter($ArrayBuffer, 'byteLength');
+           addGetter($DataView, 'buffer');
+           addGetter($DataView, 'byteLength');
+           addGetter($DataView, 'byteOffset');
+         }
+
+         redefineAll($DataView[PROTOTYPE$2], {
+           getInt8: function getInt8(byteOffset) {
+             return get$1(this, 1, byteOffset)[0] << 24 >> 24;
+           },
+           getUint8: function getUint8(byteOffset) {
+             return get$1(this, 1, byteOffset)[0];
+           },
+           getInt16: function getInt16(byteOffset /* , littleEndian */) {
+             var bytes = get$1(this, 2, byteOffset, arguments.length > 1 ? arguments[1] : undefined);
+             return (bytes[1] << 8 | bytes[0]) << 16 >> 16;
+           },
+           getUint16: function getUint16(byteOffset /* , littleEndian */) {
+             var bytes = get$1(this, 2, byteOffset, arguments.length > 1 ? arguments[1] : undefined);
+             return bytes[1] << 8 | bytes[0];
+           },
+           getInt32: function getInt32(byteOffset /* , littleEndian */) {
+             return unpackInt32(get$1(this, 4, byteOffset, arguments.length > 1 ? arguments[1] : undefined));
+           },
+           getUint32: function getUint32(byteOffset /* , littleEndian */) {
+             return unpackInt32(get$1(this, 4, byteOffset, arguments.length > 1 ? arguments[1] : undefined)) >>> 0;
+           },
+           getFloat32: function getFloat32(byteOffset /* , littleEndian */) {
+             return unpackIEEE754(get$1(this, 4, byteOffset, arguments.length > 1 ? arguments[1] : undefined), 23);
+           },
+           getFloat64: function getFloat64(byteOffset /* , littleEndian */) {
+             return unpackIEEE754(get$1(this, 8, byteOffset, arguments.length > 1 ? arguments[1] : undefined), 52);
+           },
+           setInt8: function setInt8(byteOffset, value) {
+             set$1(this, 1, byteOffset, packInt8, value);
+           },
+           setUint8: function setUint8(byteOffset, value) {
+             set$1(this, 1, byteOffset, packInt8, value);
+           },
+           setInt16: function setInt16(byteOffset, value /* , littleEndian */) {
+             set$1(this, 2, byteOffset, packInt16, value, arguments.length > 2 ? arguments[2] : undefined);
+           },
+           setUint16: function setUint16(byteOffset, value /* , littleEndian */) {
+             set$1(this, 2, byteOffset, packInt16, value, arguments.length > 2 ? arguments[2] : undefined);
+           },
+           setInt32: function setInt32(byteOffset, value /* , littleEndian */) {
+             set$1(this, 4, byteOffset, packInt32, value, arguments.length > 2 ? arguments[2] : undefined);
+           },
+           setUint32: function setUint32(byteOffset, value /* , littleEndian */) {
+             set$1(this, 4, byteOffset, packInt32, value, arguments.length > 2 ? arguments[2] : undefined);
+           },
+           setFloat32: function setFloat32(byteOffset, value /* , littleEndian */) {
+             set$1(this, 4, byteOffset, packFloat32, value, arguments.length > 2 ? arguments[2] : undefined);
+           },
+           setFloat64: function setFloat64(byteOffset, value /* , littleEndian */) {
+             set$1(this, 8, byteOffset, packFloat64, value, arguments.length > 2 ? arguments[2] : undefined);
+           }
+         });
        } else {
-               reflectApply = null;
-       }
+         if (!fails(function () {
+           NativeArrayBuffer(1);
+         }) || !fails(function () {
+           new NativeArrayBuffer(-1); // eslint-disable-line no-new
+         }) || fails(function () {
+           new NativeArrayBuffer(); // eslint-disable-line no-new
+           new NativeArrayBuffer(1.5); // eslint-disable-line no-new
+           new NativeArrayBuffer(NaN); // eslint-disable-line no-new
+           return NativeArrayBuffer.name != ARRAY_BUFFER;
+         })) {
+           $ArrayBuffer = function ArrayBuffer(length) {
+             anInstance(this, $ArrayBuffer);
+             return new NativeArrayBuffer(toIndex(length));
+           };
+           var ArrayBufferPrototype = $ArrayBuffer[PROTOTYPE$2] = NativeArrayBuffer[PROTOTYPE$2];
+           for (var keys$1 = getOwnPropertyNames(NativeArrayBuffer), j = 0, key; keys$1.length > j;) {
+             if (!((key = keys$1[j++]) in $ArrayBuffer)) {
+               createNonEnumerableProperty($ArrayBuffer, key, NativeArrayBuffer[key]);
+             }
+           }
+           ArrayBufferPrototype.constructor = $ArrayBuffer;
+         }
 
-       var constructorRegex = /^\s*class\b/;
-       var isES6ClassFn = function isES6ClassFunction(value) {
-               try {
-                       var fnStr = fnToStr.call(value);
-                       return constructorRegex.test(fnStr);
-               } catch (e) {
-                       return false; // not a function
-               }
-       };
+         // WebKit bug - the same parent prototype for typed arrays and data view
+         if (objectSetPrototypeOf && objectGetPrototypeOf($DataViewPrototype) !== ObjectPrototype$2) {
+           objectSetPrototypeOf($DataViewPrototype, ObjectPrototype$2);
+         }
 
-       var tryFunctionObject = function tryFunctionToStr(value) {
-               try {
-                       if (isES6ClassFn(value)) { return false; }
-                       fnToStr.call(value);
-                       return true;
-               } catch (e) {
-                       return false;
-               }
-       };
-       var toStr$4 = Object.prototype.toString;
-       var fnClass = '[object Function]';
-       var genClass = '[object GeneratorFunction]';
-       var hasToStringTag = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
-
-       var isCallable = reflectApply
-               ? function isCallable(value) {
-                       if (!value) { return false; }
-                       if (typeof value !== 'function' && typeof value !== 'object') { return false; }
-                       if (typeof value === 'function' && !value.prototype) { return true; }
-                       try {
-                               reflectApply(value, null, badArrayLike);
-                       } catch (e) {
-                               if (e !== isCallableMarker) { return false; }
-                       }
-                       return !isES6ClassFn(value);
-               }
-               : function isCallable(value) {
-                       if (!value) { return false; }
-                       if (typeof value !== 'function' && typeof value !== 'object') { return false; }
-                       if (typeof value === 'function' && !value.prototype) { return true; }
-                       if (hasToStringTag) { return tryFunctionObject(value); }
-                       if (isES6ClassFn(value)) { return false; }
-                       var strClass = toStr$4.call(value);
-                       return strClass === fnClass || strClass === genClass;
-               };
-
-       var getDay = Date.prototype.getDay;
-       var tryDateObject = function tryDateGetDayCall(value) {
-               try {
-                       getDay.call(value);
-                       return true;
-               } catch (e) {
-                       return false;
-               }
-       };
+         // iOS Safari 7.x bug
+         var testView = new $DataView(new $ArrayBuffer(2));
+         var nativeSetInt8 = $DataViewPrototype.setInt8;
+         testView.setInt8(0, 2147483648);
+         testView.setInt8(1, 2147483649);
+         if (testView.getInt8(0) || !testView.getInt8(1)) redefineAll($DataViewPrototype, {
+           setInt8: function setInt8(byteOffset, value) {
+             nativeSetInt8.call(this, byteOffset, value << 24 >> 24);
+           },
+           setUint8: function setUint8(byteOffset, value) {
+             nativeSetInt8.call(this, byteOffset, value << 24 >> 24);
+           }
+         }, { unsafe: true });
+       }
 
-       var toStr$5 = Object.prototype.toString;
-       var dateClass = '[object Date]';
-       var hasToStringTag$1 = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
+       setToStringTag($ArrayBuffer, ARRAY_BUFFER);
+       setToStringTag($DataView, DATA_VIEW);
 
-       var isDateObject = function isDateObject(value) {
-               if (typeof value !== 'object' || value === null) {
-                       return false;
-               }
-               return hasToStringTag$1 ? tryDateObject(value) : toStr$5.call(value) === dateClass;
+       var arrayBuffer = {
+         ArrayBuffer: $ArrayBuffer,
+         DataView: $DataView
        };
 
-       var isSymbol$2 = createCommonjsModule(function (module) {
+       var SPECIES$3 = wellKnownSymbol('species');
 
-       var toStr = Object.prototype.toString;
-       var hasSymbols = hasSymbols$1();
+       var setSpecies = function (CONSTRUCTOR_NAME) {
+         var Constructor = getBuiltIn(CONSTRUCTOR_NAME);
+         var defineProperty = objectDefineProperty.f;
 
-       if (hasSymbols) {
-               var symToStr = Symbol.prototype.toString;
-               var symStringRegex = /^Symbol\(.*\)$/;
-               var isSymbolObject = function isRealSymbolObject(value) {
-                       if (typeof value.valueOf() !== 'symbol') {
-                               return false;
-                       }
-                       return symStringRegex.test(symToStr.call(value));
-               };
+         if (descriptors && Constructor && !Constructor[SPECIES$3]) {
+           defineProperty(Constructor, SPECIES$3, {
+             configurable: true,
+             get: function () { return this; }
+           });
+         }
+       };
 
-               module.exports = function isSymbol(value) {
-                       if (typeof value === 'symbol') {
-                               return true;
-                       }
-                       if (toStr.call(value) !== '[object Symbol]') {
-                               return false;
-                       }
-                       try {
-                               return isSymbolObject(value);
-                       } catch (e) {
-                               return false;
-                       }
-               };
-       } else {
+       var ARRAY_BUFFER$1 = 'ArrayBuffer';
+       var ArrayBuffer$1 = arrayBuffer[ARRAY_BUFFER$1];
+       var NativeArrayBuffer$1 = global_1[ARRAY_BUFFER$1];
 
-               module.exports = function isSymbol(value) {
-                       // this environment does not support Symbols.
-                       return false ;
-               };
-       }
+       // `ArrayBuffer` constructor
+       // https://tc39.github.io/ecma262/#sec-arraybuffer-constructor
+       _export({ global: true, forced: NativeArrayBuffer$1 !== ArrayBuffer$1 }, {
+         ArrayBuffer: ArrayBuffer$1
        });
 
-       var hasSymbols$3 = typeof Symbol === 'function' && typeof Symbol.iterator === 'symbol';
-
+       setSpecies(ARRAY_BUFFER$1);
 
+       var TO_STRING_TAG$1 = wellKnownSymbol('toStringTag');
+       var test = {};
 
+       test[TO_STRING_TAG$1] = 'z';
 
+       var toStringTagSupport = String(test) === '[object z]';
 
+       var TO_STRING_TAG$2 = wellKnownSymbol('toStringTag');
+       // ES3 wrong here
+       var CORRECT_ARGUMENTS = classofRaw(function () { return arguments; }()) == 'Arguments';
 
-       var ordinaryToPrimitive = function OrdinaryToPrimitive(O, hint) {
-               if (typeof O === 'undefined' || O === null) {
-                       throw new TypeError('Cannot call method on ' + O);
-               }
-               if (typeof hint !== 'string' || (hint !== 'number' && hint !== 'string')) {
-                       throw new TypeError('hint must be "string" or "number"');
-               }
-               var methodNames = hint === 'string' ? ['toString', 'valueOf'] : ['valueOf', 'toString'];
-               var method, result, i;
-               for (i = 0; i < methodNames.length; ++i) {
-                       method = O[methodNames[i]];
-                       if (isCallable(method)) {
-                               result = method.call(O);
-                               if (isPrimitive$1(result)) {
-                                       return result;
-                               }
-                       }
-               }
-               throw new TypeError('No default value');
-       };
-
-       var GetMethod = function GetMethod(O, P) {
-               var func = O[P];
-               if (func !== null && typeof func !== 'undefined') {
-                       if (!isCallable(func)) {
-                               throw new TypeError(func + ' returned for property ' + P + ' of object ' + O + ' is not a function');
-                       }
-                       return func;
-               }
-               return void 0;
+       // fallback for IE11 Script Access Denied error
+       var tryGet = function (it, key) {
+         try {
+           return it[key];
+         } catch (error) { /* empty */ }
        };
 
-       // http://www.ecma-international.org/ecma-262/6.0/#sec-toprimitive
-       var es2015 = function ToPrimitive(input) {
-               if (isPrimitive$1(input)) {
-                       return input;
-               }
-               var hint = 'default';
-               if (arguments.length > 1) {
-                       if (arguments[1] === String) {
-                               hint = 'string';
-                       } else if (arguments[1] === Number) {
-                               hint = 'number';
-                       }
-               }
-
-               var exoticToPrim;
-               if (hasSymbols$3) {
-                       if (Symbol.toPrimitive) {
-                               exoticToPrim = GetMethod(input, Symbol.toPrimitive);
-                       } else if (isSymbol$2(input)) {
-                               exoticToPrim = Symbol.prototype.valueOf;
-                       }
-               }
-               if (typeof exoticToPrim !== 'undefined') {
-                       var result = exoticToPrim.call(input, hint);
-                       if (isPrimitive$1(result)) {
-                               return result;
-                       }
-                       throw new TypeError('unable to convert exotic object to primitive');
-               }
-               if (hint === 'default' && (isDateObject(input) || isSymbol$2(input))) {
-                       hint = 'string';
-               }
-               return ordinaryToPrimitive(input, hint === 'default' ? 'number' : hint);
+       // getting tag from ES6+ `Object.prototype.toString`
+       var classof = toStringTagSupport ? classofRaw : function (it) {
+         var O, tag, result;
+         return it === undefined ? 'Undefined' : it === null ? 'Null'
+           // @@toStringTag case
+           : typeof (tag = tryGet(O = Object(it), TO_STRING_TAG$2)) == 'string' ? tag
+           // builtinTag case
+           : CORRECT_ARGUMENTS ? classofRaw(O)
+           // ES3 arguments fallback
+           : (result = classofRaw(O)) == 'Object' && typeof O.callee == 'function' ? 'Arguments' : result;
        };
 
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-toprimitive
-
-       var ToPrimitive = function ToPrimitive(input) {
-               if (arguments.length > 1) {
-                       return es2015(input, arguments[1]);
-               }
-               return es2015(input);
-       };
+       var defineProperty$5 = objectDefineProperty.f;
 
-       var $TypeError$2 = GetIntrinsic('%TypeError%');
-       var $Number$1 = GetIntrinsic('%Number%');
-       var $RegExp = GetIntrinsic('%RegExp%');
-       var $parseInteger = GetIntrinsic('%parseInt%');
 
 
 
 
+       var Int8Array$1 = global_1.Int8Array;
+       var Int8ArrayPrototype = Int8Array$1 && Int8Array$1.prototype;
+       var Uint8ClampedArray = global_1.Uint8ClampedArray;
+       var Uint8ClampedArrayPrototype = Uint8ClampedArray && Uint8ClampedArray.prototype;
+       var TypedArray = Int8Array$1 && objectGetPrototypeOf(Int8Array$1);
+       var TypedArrayPrototype = Int8ArrayPrototype && objectGetPrototypeOf(Int8ArrayPrototype);
+       var ObjectPrototype$3 = Object.prototype;
+       var isPrototypeOf = ObjectPrototype$3.isPrototypeOf;
 
-       var $strSlice = callBound('String.prototype.slice');
-       var isBinary = regexTester(/^0b[01]+$/i);
-       var isOctal = regexTester(/^0o[0-7]+$/i);
-       var isInvalidHexLiteral = regexTester(/^[-+]0x[0-9a-f]+$/i);
-       var nonWS = ['\u0085', '\u200b', '\ufffe'].join('');
-       var nonWSregex = new $RegExp('[' + nonWS + ']', 'g');
-       var hasNonWS = regexTester(nonWSregex);
+       var TO_STRING_TAG$3 = wellKnownSymbol('toStringTag');
+       var TYPED_ARRAY_TAG = uid('TYPED_ARRAY_TAG');
+       // Fixing native typed arrays in Opera Presto crashes the browser, see #595
+       var NATIVE_ARRAY_BUFFER_VIEWS = arrayBufferNative && !!objectSetPrototypeOf && classof(global_1.opera) !== 'Opera';
+       var TYPED_ARRAY_TAG_REQIRED = false;
+       var NAME;
 
-       // whitespace from: https://es5.github.io/#x15.5.4.20
-       // implementation from https://github.com/es-shims/es5-shim/blob/v3.4.0/es5-shim.js#L1304-L1324
-       var ws = [
-               '\x09\x0A\x0B\x0C\x0D\x20\xA0\u1680\u180E\u2000\u2001\u2002\u2003',
-               '\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028',
-               '\u2029\uFEFF'
-       ].join('');
-       var trimRegex = new RegExp('(^[' + ws + ']+)|([' + ws + ']+$)', 'g');
-       var $replace$1 = callBound('String.prototype.replace');
-       var $trim = function (value) {
-               return $replace$1(value, trimRegex, '');
+       var TypedArrayConstructorsList = {
+         Int8Array: 1,
+         Uint8Array: 1,
+         Uint8ClampedArray: 1,
+         Int16Array: 2,
+         Uint16Array: 2,
+         Int32Array: 4,
+         Uint32Array: 4,
+         Float32Array: 4,
+         Float64Array: 8
        };
 
-
-
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-tonumber
-
-       var ToNumber$1 = function ToNumber(argument) {
-               var value = isPrimitive(argument) ? argument : ToPrimitive(argument, $Number$1);
-               if (typeof value === 'symbol') {
-                       throw new $TypeError$2('Cannot convert a Symbol value to a number');
-               }
-               if (typeof value === 'string') {
-                       if (isBinary(value)) {
-                               return ToNumber($parseInteger($strSlice(value, 2), 2));
-                       } else if (isOctal(value)) {
-                               return ToNumber($parseInteger($strSlice(value, 2), 8));
-                       } else if (hasNonWS(value) || isInvalidHexLiteral(value)) {
-                               return NaN;
-                       } else {
-                               var trimmed = $trim(value);
-                               if (trimmed !== value) {
-                                       return ToNumber(trimmed);
-                               }
-                       }
-               }
-               return $Number$1(value);
+       var isView = function isView(it) {
+         var klass = classof(it);
+         return klass === 'DataView' || has(TypedArrayConstructorsList, klass);
        };
 
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-tointeger
-
-       var ToInteger$1 = function ToInteger$1(value) {
-               var number = ToNumber$1(value);
-               return ToInteger(number);
+       var isTypedArray = function (it) {
+         return isObject(it) && has(TypedArrayConstructorsList, classof(it));
        };
 
-       var ToLength = function ToLength(argument) {
-               var len = ToInteger$1(argument);
-               if (len <= 0) { return 0; } // includes converting -0 to +0
-               if (len > maxSafeInteger) { return maxSafeInteger; }
-               return len;
+       var aTypedArray = function (it) {
+         if (isTypedArray(it)) return it;
+         throw TypeError('Target is not a typed array');
        };
 
-       // http://www.ecma-international.org/ecma-262/5.1/#sec-9.11
-
-       var IsCallable = isCallable;
-
-       var implementation$3 = function find(predicate) {
-               var list = ToObject(this);
-               var length = ToLength(list.length);
-               if (!IsCallable(predicate)) {
-                       throw new TypeError('Array#find: predicate must be a function');
-               }
-               if (length === 0) {
-                       return void 0;
-               }
-               var thisArg;
-               if (arguments.length > 0) {
-                       thisArg = arguments[1];
-               }
-
-               for (var i = 0, value; i < length; i++) {
-                       value = list[i];
-                       // inlined for performance: if (Call(predicate, thisArg, [value, i, list])) {
-                       if (predicate.apply(thisArg, [value, i, list])) {
-                               return value;
-                       }
-               }
-               return void 0;
+       var aTypedArrayConstructor = function (C) {
+         if (objectSetPrototypeOf) {
+           if (isPrototypeOf.call(TypedArray, C)) return C;
+         } else for (var ARRAY in TypedArrayConstructorsList) if (has(TypedArrayConstructorsList, NAME)) {
+           var TypedArrayConstructor = global_1[ARRAY];
+           if (TypedArrayConstructor && (C === TypedArrayConstructor || isPrototypeOf.call(TypedArrayConstructor, C))) {
+             return C;
+           }
+         } throw TypeError('Target is not a typed array constructor');
        };
 
-       var polyfill$4 = function getPolyfill() {
-               // Detect if an implementation exists
-               // Detect early implementations which skipped holes in sparse arrays
-               // eslint-disable-next-line no-sparse-arrays
-               var implemented = Array.prototype.find && [, 1].find(function () {
-                       return true;
-               }) !== 1;
+       var exportTypedArrayMethod = function (KEY, property, forced) {
+         if (!descriptors) return;
+         if (forced) for (var ARRAY in TypedArrayConstructorsList) {
+           var TypedArrayConstructor = global_1[ARRAY];
+           if (TypedArrayConstructor && has(TypedArrayConstructor.prototype, KEY)) {
+             delete TypedArrayConstructor.prototype[KEY];
+           }
+         }
+         if (!TypedArrayPrototype[KEY] || forced) {
+           redefine(TypedArrayPrototype, KEY, forced ? property
+             : NATIVE_ARRAY_BUFFER_VIEWS && Int8ArrayPrototype[KEY] || property);
+         }
+       };
 
-               // eslint-disable-next-line global-require
-               return implemented ? Array.prototype.find : implementation$3;
+       var exportTypedArrayStaticMethod = function (KEY, property, forced) {
+         var ARRAY, TypedArrayConstructor;
+         if (!descriptors) return;
+         if (objectSetPrototypeOf) {
+           if (forced) for (ARRAY in TypedArrayConstructorsList) {
+             TypedArrayConstructor = global_1[ARRAY];
+             if (TypedArrayConstructor && has(TypedArrayConstructor, KEY)) {
+               delete TypedArrayConstructor[KEY];
+             }
+           }
+           if (!TypedArray[KEY] || forced) {
+             // V8 ~ Chrome 49-50 `%TypedArray%` methods are non-writable non-configurable
+             try {
+               return redefine(TypedArray, KEY, forced ? property : NATIVE_ARRAY_BUFFER_VIEWS && Int8Array$1[KEY] || property);
+             } catch (error) { /* empty */ }
+           } else return;
+         }
+         for (ARRAY in TypedArrayConstructorsList) {
+           TypedArrayConstructor = global_1[ARRAY];
+           if (TypedArrayConstructor && (!TypedArrayConstructor[KEY] || forced)) {
+             redefine(TypedArrayConstructor, KEY, property);
+           }
+         }
        };
 
-       var shim$8 = function shimArrayPrototypeFind() {
-               var polyfill = polyfill$4();
+       for (NAME in TypedArrayConstructorsList) {
+         if (!global_1[NAME]) NATIVE_ARRAY_BUFFER_VIEWS = false;
+       }
 
-               defineProperties_1(Array.prototype, { find: polyfill }, {
-                       find: function () {
-                               return Array.prototype.find !== polyfill;
-                       }
-               });
+       // WebKit bug - typed arrays constructors prototype is Object.prototype
+       if (!NATIVE_ARRAY_BUFFER_VIEWS || typeof TypedArray != 'function' || TypedArray === Function.prototype) {
+         // eslint-disable-next-line no-shadow
+         TypedArray = function TypedArray() {
+           throw TypeError('Incorrect invocation');
+         };
+         if (NATIVE_ARRAY_BUFFER_VIEWS) for (NAME in TypedArrayConstructorsList) {
+           if (global_1[NAME]) objectSetPrototypeOf(global_1[NAME], TypedArray);
+         }
+       }
 
-               return polyfill;
-       };
+       if (!NATIVE_ARRAY_BUFFER_VIEWS || !TypedArrayPrototype || TypedArrayPrototype === ObjectPrototype$3) {
+         TypedArrayPrototype = TypedArray.prototype;
+         if (NATIVE_ARRAY_BUFFER_VIEWS) for (NAME in TypedArrayConstructorsList) {
+           if (global_1[NAME]) objectSetPrototypeOf(global_1[NAME].prototype, TypedArrayPrototype);
+         }
+       }
 
-       var slice$2 = Array.prototype.slice;
+       // WebKit bug - one more object in Uint8ClampedArray prototype chain
+       if (NATIVE_ARRAY_BUFFER_VIEWS && objectGetPrototypeOf(Uint8ClampedArrayPrototype) !== TypedArrayPrototype) {
+         objectSetPrototypeOf(Uint8ClampedArrayPrototype, TypedArrayPrototype);
+       }
 
-       var polyfill$5 = polyfill$4();
+       if (descriptors && !has(TypedArrayPrototype, TO_STRING_TAG$3)) {
+         TYPED_ARRAY_TAG_REQIRED = true;
+         defineProperty$5(TypedArrayPrototype, TO_STRING_TAG$3, { get: function () {
+           return isObject(this) ? this[TYPED_ARRAY_TAG] : undefined;
+         } });
+         for (NAME in TypedArrayConstructorsList) if (global_1[NAME]) {
+           createNonEnumerableProperty(global_1[NAME], TYPED_ARRAY_TAG, NAME);
+         }
+       }
 
-       var boundFindShim = function find(array, predicate) { // eslint-disable-line no-unused-vars
-               RequireObjectCoercible(array);
-               var args = slice$2.call(arguments, 1);
-               return polyfill$5.apply(array, args);
+       var arrayBufferViewCore = {
+         NATIVE_ARRAY_BUFFER_VIEWS: NATIVE_ARRAY_BUFFER_VIEWS,
+         TYPED_ARRAY_TAG: TYPED_ARRAY_TAG_REQIRED && TYPED_ARRAY_TAG,
+         aTypedArray: aTypedArray,
+         aTypedArrayConstructor: aTypedArrayConstructor,
+         exportTypedArrayMethod: exportTypedArrayMethod,
+         exportTypedArrayStaticMethod: exportTypedArrayStaticMethod,
+         isView: isView,
+         isTypedArray: isTypedArray,
+         TypedArray: TypedArray,
+         TypedArrayPrototype: TypedArrayPrototype
        };
 
-       defineProperties_1(boundFindShim, {
-               getPolyfill: polyfill$4,
-               implementation: implementation$3,
-               shim: shim$8
+       var NATIVE_ARRAY_BUFFER_VIEWS$1 = arrayBufferViewCore.NATIVE_ARRAY_BUFFER_VIEWS;
+
+       // `ArrayBuffer.isView` method
+       // https://tc39.github.io/ecma262/#sec-arraybuffer.isview
+       _export({ target: 'ArrayBuffer', stat: true, forced: !NATIVE_ARRAY_BUFFER_VIEWS$1 }, {
+         isView: arrayBufferViewCore.isView
        });
 
-       var array_prototype_find = boundFindShim;
-
-       var implementation$4 = function findIndex(predicate) {
-               var list = ToObject(this);
-               var length = ToLength(list.length);
-               if (!IsCallable(predicate)) {
-                       throw new TypeError('Array#findIndex: predicate must be a function');
-               }
-
-               if (length === 0) {
-                       return -1;
-               }
-
-               var thisArg;
-               if (arguments.length > 0) {
-                       thisArg = arguments[1];
-               }
-
-               for (var i = 0, value; i < length; i++) {
-                       value = list[i];
-                       // inlined for performance: if (Call(predicate, thisArg, [value, i, list])) return i;
-                       if (predicate.apply(thisArg, [value, i, list])) {
-                               return i;
-                       }
-               }
+       var SPECIES$4 = wellKnownSymbol('species');
 
-               return -1;
+       // `SpeciesConstructor` abstract operation
+       // https://tc39.github.io/ecma262/#sec-speciesconstructor
+       var speciesConstructor = function (O, defaultConstructor) {
+         var C = anObject(O).constructor;
+         var S;
+         return C === undefined || (S = anObject(C)[SPECIES$4]) == undefined ? defaultConstructor : aFunction$1(S);
        };
 
-       var polyfill$6 = function getPolyfill() {
-               // Detect if an implementation exists
-               // Detect early implementations which skipped holes in sparse arrays
-               // eslint-disable-next-line no-sparse-arrays
-               var implemented = Array.prototype.findIndex && ([, 1].findIndex(function (item, idx) {
-                       return idx === 0;
-               }) === 0);
-
-               return implemented ? Array.prototype.findIndex : implementation$4;
-       };
+       var ArrayBuffer$2 = arrayBuffer.ArrayBuffer;
+       var DataView$1 = arrayBuffer.DataView;
+       var nativeArrayBufferSlice = ArrayBuffer$2.prototype.slice;
 
-       var shim$9 = function shimFindIndex() {
-               var polyfill = polyfill$6();
+       var INCORRECT_SLICE = fails(function () {
+         return !new ArrayBuffer$2(2).slice(1, undefined).byteLength;
+       });
 
-               defineProperties_1(Array.prototype, { findIndex: polyfill }, {
-                       findIndex: function () {
-                               return Array.prototype.findIndex !== polyfill;
-                       }
-               });
+       // `ArrayBuffer.prototype.slice` method
+       // https://tc39.github.io/ecma262/#sec-arraybuffer.prototype.slice
+       _export({ target: 'ArrayBuffer', proto: true, unsafe: true, forced: INCORRECT_SLICE }, {
+         slice: function slice(start, end) {
+           if (nativeArrayBufferSlice !== undefined && end === undefined) {
+             return nativeArrayBufferSlice.call(anObject(this), start); // FF fix
+           }
+           var length = anObject(this).byteLength;
+           var first = toAbsoluteIndex(start, length);
+           var fin = toAbsoluteIndex(end === undefined ? length : end, length);
+           var result = new (speciesConstructor(this, ArrayBuffer$2))(toLength(fin - first));
+           var viewSource = new DataView$1(this);
+           var viewTarget = new DataView$1(result);
+           var index = 0;
+           while (first < fin) {
+             viewTarget.setUint8(index++, viewSource.getUint8(first++));
+           } return result;
+         }
+       });
 
-               return polyfill;
-       };
+       // `DataView` constructor
+       // https://tc39.github.io/ecma262/#sec-dataview-constructor
+       _export({ global: true, forced: !arrayBufferNative }, {
+         DataView: arrayBuffer.DataView
+       });
 
-       var slice$3 = Array.prototype.slice;
+       var defineProperty$6 = objectDefineProperty.f;
 
-       var polyfill$7 = polyfill$6();
+       var FunctionPrototype = Function.prototype;
+       var FunctionPrototypeToString = FunctionPrototype.toString;
+       var nameRE = /^\s*function ([^ (]*)/;
+       var NAME$1 = 'name';
 
-       var boundShim = function findIndex(array, predicate) { // eslint-disable-line no-unused-vars
-               RequireObjectCoercible(array);
-               var args = slice$3.call(arguments, 1);
-               return polyfill$7.apply(array, args);
-       };
+       // Function instances `.name` property
+       // https://tc39.github.io/ecma262/#sec-function-instances-name
+       if (descriptors && !(NAME$1 in FunctionPrototype)) {
+         defineProperty$6(FunctionPrototype, NAME$1, {
+           configurable: true,
+           get: function () {
+             try {
+               return FunctionPrototypeToString.call(this).match(nameRE)[1];
+             } catch (error) {
+               return '';
+             }
+           }
+         });
+       }
 
-       defineProperties_1(boundShim, {
-               getPolyfill: polyfill$6,
-               implementation: implementation$4,
-               shim: shim$9
+       // `Object.create` method
+       // https://tc39.github.io/ecma262/#sec-object.create
+       _export({ target: 'Object', stat: true, sham: !descriptors }, {
+         create: objectCreate
        });
 
-       var array_prototype_findindex = boundShim;
+       var nativeGetOwnPropertyNames$2 = objectGetOwnPropertyNamesExternal.f;
 
-       var $apply$1 = GetIntrinsic('%Reflect.apply%', true) || callBound('%Function.prototype.apply%');
+       var FAILS_ON_PRIMITIVES = fails(function () { return !Object.getOwnPropertyNames(1); });
 
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-call
+       // `Object.getOwnPropertyNames` method
+       // https://tc39.github.io/ecma262/#sec-object.getownpropertynames
+       _export({ target: 'Object', stat: true, forced: FAILS_ON_PRIMITIVES }, {
+         getOwnPropertyNames: nativeGetOwnPropertyNames$2
+       });
 
-       var Call = function Call(F, V) {
-               var args = arguments.length > 2 ? arguments[2] : [];
-               return $apply$1(F, V, args);
+       // `Object.prototype.toString` method implementation
+       // https://tc39.github.io/ecma262/#sec-object.prototype.tostring
+       var objectToString = toStringTagSupport ? {}.toString : function toString() {
+         return '[object ' + classof(this) + ']';
        };
 
-       var $defineProperty = GetIntrinsic('%Object.defineProperty%', true);
-
-       if ($defineProperty) {
-               try {
-                       $defineProperty({}, 'a', { value: 1 });
-               } catch (e) {
-                       // IE 8 has a broken defineProperty
-                       $defineProperty = null;
-               }
+       // `Object.prototype.toString` method
+       // https://tc39.github.io/ecma262/#sec-object.prototype.tostring
+       if (!toStringTagSupport) {
+         redefine(Object.prototype, 'toString', objectToString, { unsafe: true });
        }
 
+       var nativePromiseConstructor = global_1.Promise;
 
+       var ITERATOR$2 = wellKnownSymbol('iterator');
+       var ArrayPrototype$1 = Array.prototype;
 
-       var $isEnumerable = callBound('Object.prototype.propertyIsEnumerable');
-
-       // eslint-disable-next-line max-params
-       var DefineOwnProperty = function DefineOwnProperty(IsDataDescriptor, SameValue, FromPropertyDescriptor, O, P, desc) {
-               if (!$defineProperty) {
-                       if (!IsDataDescriptor(desc)) {
-                               // ES3 does not support getters/setters
-                               return false;
-                       }
-                       if (!desc['[[Configurable]]'] || !desc['[[Writable]]']) {
-                               return false;
-                       }
+       // check on default Array iterator
+       var isArrayIteratorMethod = function (it) {
+         return it !== undefined && (iterators.Array === it || ArrayPrototype$1[ITERATOR$2] === it);
+       };
 
-                       // fallback for ES3
-                       if (P in O && $isEnumerable(O, P) !== !!desc['[[Enumerable]]']) {
-                               // a non-enumerable existing property
-                               return false;
-                       }
+       var ITERATOR$3 = wellKnownSymbol('iterator');
 
-                       // property does not exist at all, or exists but is enumerable
-                       var V = desc['[[Value]]'];
-                       // eslint-disable-next-line no-param-reassign
-                       O[P] = V; // will use [[Define]]
-                       return SameValue(O[P], V);
-               }
-               $defineProperty(O, P, FromPropertyDescriptor(desc));
-               return true;
+       var getIteratorMethod = function (it) {
+         if (it != undefined) return it[ITERATOR$3]
+           || it['@@iterator']
+           || iterators[classof(it)];
        };
 
-       var src = functionBind.call(Function.call, Object.prototype.hasOwnProperty);
-
-       var $TypeError$3 = GetIntrinsic('%TypeError%');
-       var $SyntaxError = GetIntrinsic('%SyntaxError%');
+       // call something on iterator step with safe closing on error
+       var callWithSafeIterationClosing = function (iterator, fn, value, ENTRIES) {
+         try {
+           return ENTRIES ? fn(anObject(value)[0], value[1]) : fn(value);
+         // 7.4.6 IteratorClose(iterator, completion)
+         } catch (error) {
+           var returnMethod = iterator['return'];
+           if (returnMethod !== undefined) anObject(returnMethod.call(iterator));
+           throw error;
+         }
+       };
 
+       var iterate_1 = createCommonjsModule(function (module) {
+       var Result = function (stopped, result) {
+         this.stopped = stopped;
+         this.result = result;
+       };
 
+       var iterate = module.exports = function (iterable, fn, that, AS_ENTRIES, IS_ITERATOR) {
+         var boundFunction = functionBindContext(fn, that, AS_ENTRIES ? 2 : 1);
+         var iterator, iterFn, index, length, result, next, step;
 
-       var predicates = {
-               // https://ecma-international.org/ecma-262/6.0/#sec-property-descriptor-specification-type
-               'Property Descriptor': function isPropertyDescriptor(Type, Desc) {
-                       if (Type(Desc) !== 'Object') {
-                               return false;
-                       }
-                       var allowed = {
-                               '[[Configurable]]': true,
-                               '[[Enumerable]]': true,
-                               '[[Get]]': true,
-                               '[[Set]]': true,
-                               '[[Value]]': true,
-                               '[[Writable]]': true
-                       };
-
-                       for (var key in Desc) { // eslint-disable-line
-                               if (src(Desc, key) && !allowed[key]) {
-                                       return false;
-                               }
-                       }
+         if (IS_ITERATOR) {
+           iterator = iterable;
+         } else {
+           iterFn = getIteratorMethod(iterable);
+           if (typeof iterFn != 'function') throw TypeError('Target is not iterable');
+           // optimisation for array iterators
+           if (isArrayIteratorMethod(iterFn)) {
+             for (index = 0, length = toLength(iterable.length); length > index; index++) {
+               result = AS_ENTRIES
+                 ? boundFunction(anObject(step = iterable[index])[0], step[1])
+                 : boundFunction(iterable[index]);
+               if (result && result instanceof Result) return result;
+             } return new Result(false);
+           }
+           iterator = iterFn.call(iterable);
+         }
 
-                       var isData = src(Desc, '[[Value]]');
-                       var IsAccessor = src(Desc, '[[Get]]') || src(Desc, '[[Set]]');
-                       if (isData && IsAccessor) {
-                               throw new $TypeError$3('Property Descriptors may not be both accessor and data descriptors');
-                       }
-                       return true;
-               }
+         next = iterator.next;
+         while (!(step = next.call(iterator)).done) {
+           result = callWithSafeIterationClosing(iterator, boundFunction, step.value, AS_ENTRIES);
+           if (typeof result == 'object' && result && result instanceof Result) return result;
+         } return new Result(false);
        };
 
-       var assertRecord = function assertRecord(Type, recordType, argumentName, value) {
-               var predicate = predicates[recordType];
-               if (typeof predicate !== 'function') {
-                       throw new $SyntaxError('unknown record type: ' + recordType);
-               }
-               if (!predicate(Type, value)) {
-                       throw new $TypeError$3(argumentName + ' must be a ' + recordType);
-               }
+       iterate.stop = function (result) {
+         return new Result(true, result);
        };
+       });
 
-       // https://www.ecma-international.org/ecma-262/5.1/#sec-8
-
-       var Type = function Type(x) {
-               if (x === null) {
-                       return 'Null';
-               }
-               if (typeof x === 'undefined') {
-                       return 'Undefined';
-               }
-               if (typeof x === 'function' || typeof x === 'object') {
-                       return 'Object';
-               }
-               if (typeof x === 'number') {
-                       return 'Number';
-               }
-               if (typeof x === 'boolean') {
-                       return 'Boolean';
-               }
-               if (typeof x === 'string') {
-                       return 'String';
-               }
-       };
+       var ITERATOR$4 = wellKnownSymbol('iterator');
+       var SAFE_CLOSING = false;
 
-       // https://ecma-international.org/ecma-262/6.0/#sec-ecmascript-data-types-and-values
+       try {
+         var called = 0;
+         var iteratorWithReturn = {
+           next: function () {
+             return { done: !!called++ };
+           },
+           'return': function () {
+             SAFE_CLOSING = true;
+           }
+         };
+         iteratorWithReturn[ITERATOR$4] = function () {
+           return this;
+         };
+         // eslint-disable-next-line no-throw-literal
+         Array.from(iteratorWithReturn, function () { throw 2; });
+       } catch (error) { /* empty */ }
 
-       var Type$1 = function Type$1(x) {
-               if (typeof x === 'symbol') {
-                       return 'Symbol';
-               }
-               return Type(x);
-       };
+       var checkCorrectnessOfIteration = function (exec, SKIP_CLOSING) {
+         if (!SKIP_CLOSING && !SAFE_CLOSING) return false;
+         var ITERATION_SUPPORT = false;
+         try {
+           var object = {};
+           object[ITERATOR$4] = function () {
+             return {
+               next: function () {
+                 return { done: ITERATION_SUPPORT = true };
+               }
+             };
+           };
+           exec(object);
+         } catch (error) { /* empty */ }
+         return ITERATION_SUPPORT;
+       };
+
+       var engineIsIos = /(iphone|ipod|ipad).*applewebkit/i.test(engineUserAgent);
+
+       var location$1 = global_1.location;
+       var set$2 = global_1.setImmediate;
+       var clear = global_1.clearImmediate;
+       var process$2 = global_1.process;
+       var MessageChannel = global_1.MessageChannel;
+       var Dispatch = global_1.Dispatch;
+       var counter = 0;
+       var queue = {};
+       var ONREADYSTATECHANGE = 'onreadystatechange';
+       var defer, channel, port;
+
+       var run = function (id) {
+         // eslint-disable-next-line no-prototype-builtins
+         if (queue.hasOwnProperty(id)) {
+           var fn = queue[id];
+           delete queue[id];
+           fn();
+         }
+       };
+
+       var runner = function (id) {
+         return function () {
+           run(id);
+         };
+       };
+
+       var listener = function (event) {
+         run(event.data);
+       };
+
+       var post = function (id) {
+         // old engines have not location.origin
+         global_1.postMessage(id + '', location$1.protocol + '//' + location$1.host);
+       };
+
+       // Node.js 0.9+ & IE10+ has setImmediate, otherwise:
+       if (!set$2 || !clear) {
+         set$2 = function setImmediate(fn) {
+           var args = [];
+           var i = 1;
+           while (arguments.length > i) args.push(arguments[i++]);
+           queue[++counter] = function () {
+             // eslint-disable-next-line no-new-func
+             (typeof fn == 'function' ? fn : Function(fn)).apply(undefined, args);
+           };
+           defer(counter);
+           return counter;
+         };
+         clear = function clearImmediate(id) {
+           delete queue[id];
+         };
+         // Node.js 0.8-
+         if (classofRaw(process$2) == 'process') {
+           defer = function (id) {
+             process$2.nextTick(runner(id));
+           };
+         // Sphere (JS game engine) Dispatch API
+         } else if (Dispatch && Dispatch.now) {
+           defer = function (id) {
+             Dispatch.now(runner(id));
+           };
+         // Browsers with MessageChannel, includes WebWorkers
+         // except iOS - https://github.com/zloirock/core-js/issues/624
+         } else if (MessageChannel && !engineIsIos) {
+           channel = new MessageChannel();
+           port = channel.port2;
+           channel.port1.onmessage = listener;
+           defer = functionBindContext(port.postMessage, port, 1);
+         // Browsers with postMessage, skip WebWorkers
+         // IE8 has postMessage, but it's sync & typeof its postMessage is 'object'
+         } else if (
+           global_1.addEventListener &&
+           typeof postMessage == 'function' &&
+           !global_1.importScripts &&
+           !fails(post) &&
+           location$1.protocol !== 'file:'
+         ) {
+           defer = post;
+           global_1.addEventListener('message', listener, false);
+         // IE8-
+         } else if (ONREADYSTATECHANGE in documentCreateElement('script')) {
+           defer = function (id) {
+             html.appendChild(documentCreateElement('script'))[ONREADYSTATECHANGE] = function () {
+               html.removeChild(this);
+               run(id);
+             };
+           };
+         // Rest old browsers
+         } else {
+           defer = function (id) {
+             setTimeout(runner(id), 0);
+           };
+         }
+       }
 
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-frompropertydescriptor
-
-       var FromPropertyDescriptor = function FromPropertyDescriptor(Desc) {
-               if (typeof Desc === 'undefined') {
-                       return Desc;
-               }
-
-               assertRecord(Type$1, 'Property Descriptor', 'Desc', Desc);
-
-               var obj = {};
-               if ('[[Value]]' in Desc) {
-                       obj.value = Desc['[[Value]]'];
-               }
-               if ('[[Writable]]' in Desc) {
-                       obj.writable = Desc['[[Writable]]'];
-               }
-               if ('[[Get]]' in Desc) {
-                       obj.get = Desc['[[Get]]'];
-               }
-               if ('[[Set]]' in Desc) {
-                       obj.set = Desc['[[Set]]'];
-               }
-               if ('[[Enumerable]]' in Desc) {
-                       obj.enumerable = Desc['[[Enumerable]]'];
-               }
-               if ('[[Configurable]]' in Desc) {
-                       obj.configurable = Desc['[[Configurable]]'];
-               }
-               return obj;
+       var task = {
+         set: set$2,
+         clear: clear
        };
 
-       var $gOPD$1 = GetIntrinsic('%Object.getOwnPropertyDescriptor%');
-       if ($gOPD$1) {
-               try {
-                       $gOPD$1([], 'length');
-               } catch (e) {
-                       // IE 8 has a broken gOPD
-                       $gOPD$1 = null;
-               }
-       }
+       var getOwnPropertyDescriptor$2 = objectGetOwnPropertyDescriptor.f;
 
-       var getOwnPropertyDescriptor = $gOPD$1;
+       var macrotask = task.set;
 
-       var $Array = GetIntrinsic('%Array%');
 
-       // eslint-disable-next-line global-require
-       var toStr$6 = !$Array.isArray && callBound('Object.prototype.toString');
+       var MutationObserver = global_1.MutationObserver || global_1.WebKitMutationObserver;
+       var process$3 = global_1.process;
+       var Promise$1 = global_1.Promise;
+       var IS_NODE = classofRaw(process$3) == 'process';
+       // Node.js 11 shows ExperimentalWarning on getting `queueMicrotask`
+       var queueMicrotaskDescriptor = getOwnPropertyDescriptor$2(global_1, 'queueMicrotask');
+       var queueMicrotask = queueMicrotaskDescriptor && queueMicrotaskDescriptor.value;
 
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-isarray
+       var flush, head, last, notify, toggle, node, promise, then;
 
-       var IsArray = $Array.isArray || function IsArray(argument) {
-               return toStr$6(argument) === '[object Array]';
+       // modern engines have queueMicrotask method
+       if (!queueMicrotask) {
+         flush = function () {
+           var parent, fn;
+           if (IS_NODE && (parent = process$3.domain)) parent.exit();
+           while (head) {
+             fn = head.fn;
+             head = head.next;
+             try {
+               fn();
+             } catch (error) {
+               if (head) notify();
+               else last = undefined;
+               throw error;
+             }
+           } last = undefined;
+           if (parent) parent.enter();
+         };
+
+         // Node.js
+         if (IS_NODE) {
+           notify = function () {
+             process$3.nextTick(flush);
+           };
+         // browsers with MutationObserver, except iOS - https://github.com/zloirock/core-js/issues/339
+         } else if (MutationObserver && !engineIsIos) {
+           toggle = true;
+           node = document.createTextNode('');
+           new MutationObserver(flush).observe(node, { characterData: true });
+           notify = function () {
+             node.data = toggle = !toggle;
+           };
+         // environments with maybe non-completely correct, but existent Promise
+         } else if (Promise$1 && Promise$1.resolve) {
+           // Promise.resolve without an argument throws an error in LG WebOS 2
+           promise = Promise$1.resolve(undefined);
+           then = promise.then;
+           notify = function () {
+             then.call(promise, flush);
+           };
+         // for other environments - macrotask based on:
+         // - setImmediate
+         // - MessageChannel
+         // - window.postMessag
+         // - onreadystatechange
+         // - setTimeout
+         } else {
+           notify = function () {
+             // strange IE + webpack dev server bug - use .call(global)
+             macrotask.call(global_1, flush);
+           };
+         }
+       }
+
+       var microtask = queueMicrotask || function (fn) {
+         var task = { fn: fn, next: undefined };
+         if (last) last.next = task;
+         if (!head) {
+           head = task;
+           notify();
+         } last = task;
        };
 
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-ispropertykey
+       var PromiseCapability = function (C) {
+         var resolve, reject;
+         this.promise = new C(function ($$resolve, $$reject) {
+           if (resolve !== undefined || reject !== undefined) throw TypeError('Bad Promise constructor');
+           resolve = $$resolve;
+           reject = $$reject;
+         });
+         this.resolve = aFunction$1(resolve);
+         this.reject = aFunction$1(reject);
+       };
 
-       var IsPropertyKey = function IsPropertyKey(argument) {
-               return typeof argument === 'string' || typeof argument === 'symbol';
+       // 25.4.1.5 NewPromiseCapability(C)
+       var f$7 = function (C) {
+         return new PromiseCapability(C);
        };
 
-       var hasSymbols$4 = hasSymbols$1();
-       var hasToStringTag$2 = hasSymbols$4 && typeof Symbol.toStringTag === 'symbol';
-       var regexExec;
-       var isRegexMarker;
-       var badStringifier;
-
-       if (hasToStringTag$2) {
-               regexExec = Function.call.bind(RegExp.prototype.exec);
-               isRegexMarker = {};
-
-               var throwRegexMarker = function () {
-                       throw isRegexMarker;
-               };
-               badStringifier = {
-                       toString: throwRegexMarker,
-                       valueOf: throwRegexMarker
-               };
-
-               if (typeof Symbol.toPrimitive === 'symbol') {
-                       badStringifier[Symbol.toPrimitive] = throwRegexMarker;
-               }
-       }
-
-       var toStr$7 = Object.prototype.toString;
-       var regexClass = '[object RegExp]';
-
-       var isRegex = hasToStringTag$2
-               // eslint-disable-next-line consistent-return
-               ? function isRegex(value) {
-                       if (!value || typeof value !== 'object') {
-                               return false;
-                       }
+       var newPromiseCapability = {
+               f: f$7
+       };
 
-                       try {
-                               regexExec(value, badStringifier);
-                       } catch (e) {
-                               return e === isRegexMarker;
-                       }
-               }
-               : function isRegex(value) {
-                       // In older browsers, typeof regex incorrectly returns 'function'
-                       if (!value || (typeof value !== 'object' && typeof value !== 'function')) {
-                               return false;
-                       }
+       var promiseResolve = function (C, x) {
+         anObject(C);
+         if (isObject(x) && x.constructor === C) return x;
+         var promiseCapability = newPromiseCapability.f(C);
+         var resolve = promiseCapability.resolve;
+         resolve(x);
+         return promiseCapability.promise;
+       };
 
-                       return toStr$7.call(value) === regexClass;
-               };
+       var hostReportErrors = function (a, b) {
+         var console = global_1.console;
+         if (console && console.error) {
+           arguments.length === 1 ? console.error(a) : console.error(a, b);
+         }
+       };
 
-       // http://www.ecma-international.org/ecma-262/5.1/#sec-9.2
+       var perform = function (exec) {
+         try {
+           return { error: false, value: exec() };
+         } catch (error) {
+           return { error: true, value: error };
+         }
+       };
 
-       var ToBoolean = function ToBoolean(value) { return !!value; };
+       var task$1 = task.set;
 
-       var $match = GetIntrinsic('%Symbol.match%', true);
 
 
 
 
 
-       // https://ecma-international.org/ecma-262/6.0/#sec-isregexp
 
-       var IsRegExp = function IsRegExp(argument) {
-               if (!argument || typeof argument !== 'object') {
-                       return false;
-               }
-               if ($match) {
-                       var isRegExp = argument[$match];
-                       if (typeof isRegExp !== 'undefined') {
-                               return ToBoolean(isRegExp);
-                       }
-               }
-               return isRegex(argument);
-       };
 
-       var $TypeError$4 = GetIntrinsic('%TypeError%');
 
 
+       var SPECIES$5 = wellKnownSymbol('species');
+       var PROMISE = 'Promise';
+       var getInternalState$3 = internalState.get;
+       var setInternalState$3 = internalState.set;
+       var getInternalPromiseState = internalState.getterFor(PROMISE);
+       var PromiseConstructor = nativePromiseConstructor;
+       var TypeError$1 = global_1.TypeError;
+       var document$2 = global_1.document;
+       var process$4 = global_1.process;
+       var $fetch = getBuiltIn('fetch');
+       var newPromiseCapability$1 = newPromiseCapability.f;
+       var newGenericPromiseCapability = newPromiseCapability$1;
+       var IS_NODE$1 = classofRaw(process$4) == 'process';
+       var DISPATCH_EVENT = !!(document$2 && document$2.createEvent && global_1.dispatchEvent);
+       var UNHANDLED_REJECTION = 'unhandledrejection';
+       var REJECTION_HANDLED = 'rejectionhandled';
+       var PENDING = 0;
+       var FULFILLED = 1;
+       var REJECTED = 2;
+       var HANDLED = 1;
+       var UNHANDLED = 2;
+       var Internal, OwnPromiseCapability, PromiseWrapper, nativeThen;
 
+       var FORCED = isForced_1(PROMISE, function () {
+         var GLOBAL_CORE_JS_PROMISE = inspectSource(PromiseConstructor) !== String(PromiseConstructor);
+         if (!GLOBAL_CORE_JS_PROMISE) {
+           // V8 6.6 (Node 10 and Chrome 66) have a bug with resolving custom thenables
+           // https://bugs.chromium.org/p/chromium/issues/detail?id=830565
+           // We can't detect it synchronously, so just check versions
+           if (engineV8Version === 66) return true;
+           // Unhandled rejections tracking support, NodeJS Promise without it fails @@species test
+           if (!IS_NODE$1 && typeof PromiseRejectionEvent != 'function') return true;
+         }
+         // We can't use @@species feature detection in V8 since it causes
+         // deoptimization and performance degradation
+         // https://github.com/zloirock/core-js/issues/679
+         if (engineV8Version >= 51 && /native code/.test(PromiseConstructor)) return false;
+         // Detect correctness of subclassing with @@species support
+         var promise = PromiseConstructor.resolve(1);
+         var FakePromise = function (exec) {
+           exec(function () { /* empty */ }, function () { /* empty */ });
+         };
+         var constructor = promise.constructor = {};
+         constructor[SPECIES$5] = FakePromise;
+         return !(promise.then(function () { /* empty */ }) instanceof FakePromise);
+       });
 
+       var INCORRECT_ITERATION = FORCED || !checkCorrectnessOfIteration(function (iterable) {
+         PromiseConstructor.all(iterable)['catch'](function () { /* empty */ });
+       });
 
-       // https://ecma-international.org/ecma-262/5.1/#sec-8.10.5
+       // helpers
+       var isThenable = function (it) {
+         var then;
+         return isObject(it) && typeof (then = it.then) == 'function' ? then : false;
+       };
+
+       var notify$1 = function (promise, state, isReject) {
+         if (state.notified) return;
+         state.notified = true;
+         var chain = state.reactions;
+         microtask(function () {
+           var value = state.value;
+           var ok = state.state == FULFILLED;
+           var index = 0;
+           // variable length - can't use forEach
+           while (chain.length > index) {
+             var reaction = chain[index++];
+             var handler = ok ? reaction.ok : reaction.fail;
+             var resolve = reaction.resolve;
+             var reject = reaction.reject;
+             var domain = reaction.domain;
+             var result, then, exited;
+             try {
+               if (handler) {
+                 if (!ok) {
+                   if (state.rejection === UNHANDLED) onHandleUnhandled(promise, state);
+                   state.rejection = HANDLED;
+                 }
+                 if (handler === true) result = value;
+                 else {
+                   if (domain) domain.enter();
+                   result = handler(value); // can throw
+                   if (domain) {
+                     domain.exit();
+                     exited = true;
+                   }
+                 }
+                 if (result === reaction.promise) {
+                   reject(TypeError$1('Promise-chain cycle'));
+                 } else if (then = isThenable(result)) {
+                   then.call(result, resolve, reject);
+                 } else resolve(result);
+               } else reject(value);
+             } catch (error) {
+               if (domain && !exited) domain.exit();
+               reject(error);
+             }
+           }
+           state.reactions = [];
+           state.notified = false;
+           if (isReject && !state.rejection) onUnhandled(promise, state);
+         });
+       };
 
-       var ToPropertyDescriptor = function ToPropertyDescriptor(Obj) {
-               if (Type$1(Obj) !== 'Object') {
-                       throw new $TypeError$4('ToPropertyDescriptor requires an object');
-               }
+       var dispatchEvent = function (name, promise, reason) {
+         var event, handler;
+         if (DISPATCH_EVENT) {
+           event = document$2.createEvent('Event');
+           event.promise = promise;
+           event.reason = reason;
+           event.initEvent(name, false, true);
+           global_1.dispatchEvent(event);
+         } else event = { promise: promise, reason: reason };
+         if (handler = global_1['on' + name]) handler(event);
+         else if (name === UNHANDLED_REJECTION) hostReportErrors('Unhandled promise rejection', reason);
+       };
+
+       var onUnhandled = function (promise, state) {
+         task$1.call(global_1, function () {
+           var value = state.value;
+           var IS_UNHANDLED = isUnhandled(state);
+           var result;
+           if (IS_UNHANDLED) {
+             result = perform(function () {
+               if (IS_NODE$1) {
+                 process$4.emit('unhandledRejection', value, promise);
+               } else dispatchEvent(UNHANDLED_REJECTION, promise, value);
+             });
+             // Browsers should not trigger `rejectionHandled` event if it was handled here, NodeJS - should
+             state.rejection = IS_NODE$1 || isUnhandled(state) ? UNHANDLED : HANDLED;
+             if (result.error) throw result.value;
+           }
+         });
+       };
 
-               var desc = {};
-               if (src(Obj, 'enumerable')) {
-                       desc['[[Enumerable]]'] = ToBoolean(Obj.enumerable);
-               }
-               if (src(Obj, 'configurable')) {
-                       desc['[[Configurable]]'] = ToBoolean(Obj.configurable);
-               }
-               if (src(Obj, 'value')) {
-                       desc['[[Value]]'] = Obj.value;
-               }
-               if (src(Obj, 'writable')) {
-                       desc['[[Writable]]'] = ToBoolean(Obj.writable);
-               }
-               if (src(Obj, 'get')) {
-                       var getter = Obj.get;
-                       if (typeof getter !== 'undefined' && !IsCallable(getter)) {
-                               throw new TypeError('getter must be a function');
-                       }
-                       desc['[[Get]]'] = getter;
-               }
-               if (src(Obj, 'set')) {
-                       var setter = Obj.set;
-                       if (typeof setter !== 'undefined' && !IsCallable(setter)) {
-                               throw new $TypeError$4('setter must be a function');
-                       }
-                       desc['[[Set]]'] = setter;
-               }
+       var isUnhandled = function (state) {
+         return state.rejection !== HANDLED && !state.parent;
+       };
 
-               if ((src(desc, '[[Get]]') || src(desc, '[[Set]]')) && (src(desc, '[[Value]]') || src(desc, '[[Writable]]'))) {
-                       throw new $TypeError$4('Invalid property descriptor. Cannot both specify accessors and a value or writable attribute');
-               }
-               return desc;
+       var onHandleUnhandled = function (promise, state) {
+         task$1.call(global_1, function () {
+           if (IS_NODE$1) {
+             process$4.emit('rejectionHandled', promise);
+           } else dispatchEvent(REJECTION_HANDLED, promise, state.value);
+         });
        };
 
-       var $TypeError$5 = GetIntrinsic('%TypeError%');
+       var bind = function (fn, promise, state, unwrap) {
+         return function (value) {
+           fn(promise, state, value, unwrap);
+         };
+       };
 
+       var internalReject = function (promise, state, value, unwrap) {
+         if (state.done) return;
+         state.done = true;
+         if (unwrap) state = unwrap;
+         state.value = value;
+         state.state = REJECTED;
+         notify$1(promise, state, true);
+       };
 
+       var internalResolve = function (promise, state, value, unwrap) {
+         if (state.done) return;
+         state.done = true;
+         if (unwrap) state = unwrap;
+         try {
+           if (promise === value) throw TypeError$1("Promise can't be resolved itself");
+           var then = isThenable(value);
+           if (then) {
+             microtask(function () {
+               var wrapper = { done: false };
+               try {
+                 then.call(value,
+                   bind(internalResolve, promise, wrapper, state),
+                   bind(internalReject, promise, wrapper, state)
+                 );
+               } catch (error) {
+                 internalReject(promise, wrapper, error, state);
+               }
+             });
+           } else {
+             state.value = value;
+             state.state = FULFILLED;
+             notify$1(promise, state, false);
+           }
+         } catch (error) {
+           internalReject(promise, { done: false }, error, state);
+         }
+       };
 
-       var $isEnumerable$1 = callBound('Object.prototype.propertyIsEnumerable');
+       // constructor polyfill
+       if (FORCED) {
+         // 25.4.3.1 Promise(executor)
+         PromiseConstructor = function Promise(executor) {
+           anInstance(this, PromiseConstructor, PROMISE);
+           aFunction$1(executor);
+           Internal.call(this);
+           var state = getInternalState$3(this);
+           try {
+             executor(bind(internalResolve, this, state), bind(internalReject, this, state));
+           } catch (error) {
+             internalReject(this, state, error);
+           }
+         };
+         // eslint-disable-next-line no-unused-vars
+         Internal = function Promise(executor) {
+           setInternalState$3(this, {
+             type: PROMISE,
+             done: false,
+             notified: false,
+             parent: false,
+             reactions: [],
+             rejection: false,
+             state: PENDING,
+             value: undefined
+           });
+         };
+         Internal.prototype = redefineAll(PromiseConstructor.prototype, {
+           // `Promise.prototype.then` method
+           // https://tc39.github.io/ecma262/#sec-promise.prototype.then
+           then: function then(onFulfilled, onRejected) {
+             var state = getInternalPromiseState(this);
+             var reaction = newPromiseCapability$1(speciesConstructor(this, PromiseConstructor));
+             reaction.ok = typeof onFulfilled == 'function' ? onFulfilled : true;
+             reaction.fail = typeof onRejected == 'function' && onRejected;
+             reaction.domain = IS_NODE$1 ? process$4.domain : undefined;
+             state.parent = true;
+             state.reactions.push(reaction);
+             if (state.state != PENDING) notify$1(this, state, false);
+             return reaction.promise;
+           },
+           // `Promise.prototype.catch` method
+           // https://tc39.github.io/ecma262/#sec-promise.prototype.catch
+           'catch': function (onRejected) {
+             return this.then(undefined, onRejected);
+           }
+         });
+         OwnPromiseCapability = function () {
+           var promise = new Internal();
+           var state = getInternalState$3(promise);
+           this.promise = promise;
+           this.resolve = bind(internalResolve, promise, state);
+           this.reject = bind(internalReject, promise, state);
+         };
+         newPromiseCapability.f = newPromiseCapability$1 = function (C) {
+           return C === PromiseConstructor || C === PromiseWrapper
+             ? new OwnPromiseCapability(C)
+             : newGenericPromiseCapability(C);
+         };
+
+         if ( typeof nativePromiseConstructor == 'function') {
+           nativeThen = nativePromiseConstructor.prototype.then;
+
+           // wrap native Promise#then for native async functions
+           redefine(nativePromiseConstructor.prototype, 'then', function then(onFulfilled, onRejected) {
+             var that = this;
+             return new PromiseConstructor(function (resolve, reject) {
+               nativeThen.call(that, resolve, reject);
+             }).then(onFulfilled, onRejected);
+           // https://github.com/zloirock/core-js/issues/640
+           }, { unsafe: true });
+
+           // wrap fetch result
+           if (typeof $fetch == 'function') _export({ global: true, enumerable: true, forced: true }, {
+             // eslint-disable-next-line no-unused-vars
+             fetch: function fetch(input /* , init */) {
+               return promiseResolve(PromiseConstructor, $fetch.apply(global_1, arguments));
+             }
+           });
+         }
+       }
 
+       _export({ global: true, wrap: true, forced: FORCED }, {
+         Promise: PromiseConstructor
+       });
 
+       setToStringTag(PromiseConstructor, PROMISE, false);
+       setSpecies(PROMISE);
 
+       PromiseWrapper = getBuiltIn(PROMISE);
 
+       // statics
+       _export({ target: PROMISE, stat: true, forced: FORCED }, {
+         // `Promise.reject` method
+         // https://tc39.github.io/ecma262/#sec-promise.reject
+         reject: function reject(r) {
+           var capability = newPromiseCapability$1(this);
+           capability.reject.call(undefined, r);
+           return capability.promise;
+         }
+       });
 
+       _export({ target: PROMISE, stat: true, forced:  FORCED }, {
+         // `Promise.resolve` method
+         // https://tc39.github.io/ecma262/#sec-promise.resolve
+         resolve: function resolve(x) {
+           return promiseResolve( this, x);
+         }
+       });
 
+       _export({ target: PROMISE, stat: true, forced: INCORRECT_ITERATION }, {
+         // `Promise.all` method
+         // https://tc39.github.io/ecma262/#sec-promise.all
+         all: function all(iterable) {
+           var C = this;
+           var capability = newPromiseCapability$1(C);
+           var resolve = capability.resolve;
+           var reject = capability.reject;
+           var result = perform(function () {
+             var $promiseResolve = aFunction$1(C.resolve);
+             var values = [];
+             var counter = 0;
+             var remaining = 1;
+             iterate_1(iterable, function (promise) {
+               var index = counter++;
+               var alreadyCalled = false;
+               values.push(undefined);
+               remaining++;
+               $promiseResolve.call(C, promise).then(function (value) {
+                 if (alreadyCalled) return;
+                 alreadyCalled = true;
+                 values[index] = value;
+                 --remaining || resolve(values);
+               }, reject);
+             });
+             --remaining || resolve(values);
+           });
+           if (result.error) reject(result.value);
+           return capability.promise;
+         },
+         // `Promise.race` method
+         // https://tc39.github.io/ecma262/#sec-promise.race
+         race: function race(iterable) {
+           var C = this;
+           var capability = newPromiseCapability$1(C);
+           var reject = capability.reject;
+           var result = perform(function () {
+             var $promiseResolve = aFunction$1(C.resolve);
+             iterate_1(iterable, function (promise) {
+               $promiseResolve.call(C, promise).then(capability.resolve, reject);
+             });
+           });
+           if (result.error) reject(result.value);
+           return capability.promise;
+         }
+       });
+
+       // `RegExp.prototype.flags` getter implementation
+       // https://tc39.github.io/ecma262/#sec-get-regexp.prototype.flags
+       var regexpFlags = function () {
+         var that = anObject(this);
+         var result = '';
+         if (that.global) result += 'g';
+         if (that.ignoreCase) result += 'i';
+         if (that.multiline) result += 'm';
+         if (that.dotAll) result += 's';
+         if (that.unicode) result += 'u';
+         if (that.sticky) result += 'y';
+         return result;
+       };
 
+       // babel-minify transpiles RegExp('a', 'y') -> /a/y and it causes SyntaxError,
+       // so we use an intermediate function.
+       function RE(s, f) {
+         return RegExp(s, f);
+       }
 
+       var UNSUPPORTED_Y = fails(function () {
+         // babel-minify transpiles RegExp('a', 'y') -> /a/y and it causes SyntaxError
+         var re = RE('a', 'y');
+         re.lastIndex = 2;
+         return re.exec('abcd') != null;
+       });
 
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-ordinarygetownproperty
+       var BROKEN_CARET = fails(function () {
+         // https://bugzilla.mozilla.org/show_bug.cgi?id=773687
+         var re = RE('^r', 'gy');
+         re.lastIndex = 2;
+         return re.exec('str') != null;
+       });
 
-       var OrdinaryGetOwnProperty = function OrdinaryGetOwnProperty(O, P) {
-               if (Type$1(O) !== 'Object') {
-                       throw new $TypeError$5('Assertion failed: O must be an Object');
-               }
-               if (!IsPropertyKey(P)) {
-                       throw new $TypeError$5('Assertion failed: P must be a Property Key');
-               }
-               if (!src(O, P)) {
-                       return void 0;
-               }
-               if (!getOwnPropertyDescriptor) {
-                       // ES3 / IE 8 fallback
-                       var arrayLength = IsArray(O) && P === 'length';
-                       var regexLastIndex = IsRegExp(O) && P === 'lastIndex';
-                       return {
-                               '[[Configurable]]': !(arrayLength || regexLastIndex),
-                               '[[Enumerable]]': $isEnumerable$1(O, P),
-                               '[[Value]]': O[P],
-                               '[[Writable]]': true
-                       };
-               }
-               return ToPropertyDescriptor(getOwnPropertyDescriptor(O, P));
+       var regexpStickyHelpers = {
+               UNSUPPORTED_Y: UNSUPPORTED_Y,
+               BROKEN_CARET: BROKEN_CARET
        };
 
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-isdatadescriptor
+       var nativeExec = RegExp.prototype.exec;
+       // This always refers to the native implementation, because the
+       // String#replace polyfill uses ./fix-regexp-well-known-symbol-logic.js,
+       // which loads this file before patching the method.
+       var nativeReplace = String.prototype.replace;
+
+       var patchedExec = nativeExec;
 
-       var IsDataDescriptor = function IsDataDescriptor(Desc) {
-               if (typeof Desc === 'undefined') {
-                       return false;
-               }
+       var UPDATES_LAST_INDEX_WRONG = (function () {
+         var re1 = /a/;
+         var re2 = /b*/g;
+         nativeExec.call(re1, 'a');
+         nativeExec.call(re2, 'a');
+         return re1.lastIndex !== 0 || re2.lastIndex !== 0;
+       })();
 
-               assertRecord(Type$1, 'Property Descriptor', 'Desc', Desc);
+       var UNSUPPORTED_Y$1 = regexpStickyHelpers.UNSUPPORTED_Y || regexpStickyHelpers.BROKEN_CARET;
 
-               if (!src(Desc, '[[Value]]') && !src(Desc, '[[Writable]]')) {
-                       return false;
-               }
+       // nonparticipating capturing group, copied from es5-shim's String#split patch.
+       var NPCG_INCLUDED = /()??/.exec('')[1] !== undefined;
 
-               return true;
-       };
+       var PATCH = UPDATES_LAST_INDEX_WRONG || NPCG_INCLUDED || UNSUPPORTED_Y$1;
 
-       var $Object$1 = GetIntrinsic('%Object%');
+       if (PATCH) {
+         patchedExec = function exec(str) {
+           var re = this;
+           var lastIndex, reCopy, match, i;
+           var sticky = UNSUPPORTED_Y$1 && re.sticky;
+           var flags = regexpFlags.call(re);
+           var source = re.source;
+           var charsAdded = 0;
+           var strCopy = str;
 
+           if (sticky) {
+             flags = flags.replace('y', '');
+             if (flags.indexOf('g') === -1) {
+               flags += 'g';
+             }
+
+             strCopy = String(str).slice(re.lastIndex);
+             // Support anchored sticky behavior.
+             if (re.lastIndex > 0 && (!re.multiline || re.multiline && str[re.lastIndex - 1] !== '\n')) {
+               source = '(?: ' + source + ')';
+               strCopy = ' ' + strCopy;
+               charsAdded++;
+             }
+             // ^(? + rx + ) is needed, in combination with some str slicing, to
+             // simulate the 'y' flag.
+             reCopy = new RegExp('^(?:' + source + ')', flags);
+           }
 
+           if (NPCG_INCLUDED) {
+             reCopy = new RegExp('^' + source + '$(?!\\s)', flags);
+           }
+           if (UPDATES_LAST_INDEX_WRONG) lastIndex = re.lastIndex;
+
+           match = nativeExec.call(sticky ? reCopy : re, strCopy);
 
-       var $preventExtensions = $Object$1.preventExtensions;
-       var $isExtensible = $Object$1.isExtensible;
+           if (sticky) {
+             if (match) {
+               match.input = match.input.slice(charsAdded);
+               match[0] = match[0].slice(charsAdded);
+               match.index = re.lastIndex;
+               re.lastIndex += match[0].length;
+             } else re.lastIndex = 0;
+           } else if (UPDATES_LAST_INDEX_WRONG && match) {
+             re.lastIndex = re.global ? match.index + match[0].length : lastIndex;
+           }
+           if (NPCG_INCLUDED && match && match.length > 1) {
+             // Fix browsers whose `exec` methods don't consistently return `undefined`
+             // for NPCG, like IE8. NOTE: This doesn' work for /(.?)?/
+             nativeReplace.call(match[0], reCopy, function () {
+               for (i = 1; i < arguments.length - 2; i++) {
+                 if (arguments[i] === undefined) match[i] = undefined;
+               }
+             });
+           }
 
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-isextensible-o
+           return match;
+         };
+       }
 
-       var IsExtensible = $preventExtensions
-               ? function IsExtensible(obj) {
-                       return !isPrimitive(obj) && $isExtensible(obj);
-               }
-               : function IsExtensible(obj) {
-                       return !isPrimitive(obj);
-               };
+       var regexpExec = patchedExec;
 
-       // http://www.ecma-international.org/ecma-262/5.1/#sec-9.12
+       _export({ target: 'RegExp', proto: true, forced: /./.exec !== regexpExec }, {
+         exec: regexpExec
+       });
 
-       var SameValue = function SameValue(x, y) {
-               if (x === y) { // 0 === -0, but they are not identical.
-                       if (x === 0) { return 1 / x === 1 / y; }
-                       return true;
-               }
-               return _isNaN(x) && _isNaN(y);
-       };
+       var TO_STRING$1 = 'toString';
+       var RegExpPrototype = RegExp.prototype;
+       var nativeToString = RegExpPrototype[TO_STRING$1];
+
+       var NOT_GENERIC = fails(function () { return nativeToString.call({ source: 'a', flags: 'b' }) != '/a/b'; });
+       // FF44- RegExp#toString has a wrong name
+       var INCORRECT_NAME = nativeToString.name != TO_STRING$1;
+
+       // `RegExp.prototype.toString` method
+       // https://tc39.github.io/ecma262/#sec-regexp.prototype.tostring
+       if (NOT_GENERIC || INCORRECT_NAME) {
+         redefine(RegExp.prototype, TO_STRING$1, function toString() {
+           var R = anObject(this);
+           var p = String(R.source);
+           var rf = R.flags;
+           var f = String(rf === undefined && R instanceof RegExp && !('flags' in RegExpPrototype) ? regexpFlags.call(R) : rf);
+           return '/' + p + '/' + f;
+         }, { unsafe: true });
+       }
+
+       // `String.prototype.{ codePointAt, at }` methods implementation
+       var createMethod$2 = function (CONVERT_TO_STRING) {
+         return function ($this, pos) {
+           var S = String(requireObjectCoercible($this));
+           var position = toInteger(pos);
+           var size = S.length;
+           var first, second;
+           if (position < 0 || position >= size) return CONVERT_TO_STRING ? '' : undefined;
+           first = S.charCodeAt(position);
+           return first < 0xD800 || first > 0xDBFF || position + 1 === size
+             || (second = S.charCodeAt(position + 1)) < 0xDC00 || second > 0xDFFF
+               ? CONVERT_TO_STRING ? S.charAt(position) : first
+               : CONVERT_TO_STRING ? S.slice(position, position + 2) : (first - 0xD800 << 10) + (second - 0xDC00) + 0x10000;
+         };
+       };
+
+       var stringMultibyte = {
+         // `String.prototype.codePointAt` method
+         // https://tc39.github.io/ecma262/#sec-string.prototype.codepointat
+         codeAt: createMethod$2(false),
+         // `String.prototype.at` method
+         // https://github.com/mathiasbynens/String.prototype.at
+         charAt: createMethod$2(true)
+       };
+
+       var charAt = stringMultibyte.charAt;
+
+
+
+       var STRING_ITERATOR = 'String Iterator';
+       var setInternalState$4 = internalState.set;
+       var getInternalState$4 = internalState.getterFor(STRING_ITERATOR);
+
+       // `String.prototype[@@iterator]` method
+       // https://tc39.github.io/ecma262/#sec-string.prototype-@@iterator
+       defineIterator(String, 'String', function (iterated) {
+         setInternalState$4(this, {
+           type: STRING_ITERATOR,
+           string: String(iterated),
+           index: 0
+         });
+       // `%StringIteratorPrototype%.next` method
+       // https://tc39.github.io/ecma262/#sec-%stringiteratorprototype%.next
+       }, function next() {
+         var state = getInternalState$4(this);
+         var string = state.string;
+         var index = state.index;
+         var point;
+         if (index >= string.length) return { value: undefined, done: true };
+         point = charAt(string, index);
+         state.index += point.length;
+         return { value: point, done: false };
+       });
 
-       var $TypeError$6 = GetIntrinsic('%TypeError%');
+       // TODO: Remove from `core-js@4` since it's moved to entry points
 
 
 
 
 
 
+       var SPECIES$6 = wellKnownSymbol('species');
 
+       var REPLACE_SUPPORTS_NAMED_GROUPS = !fails(function () {
+         // #replace needs built-in support for named groups.
+         // #match works fine because it just return the exec results, even if it has
+         // a "grops" property.
+         var re = /./;
+         re.exec = function () {
+           var result = [];
+           result.groups = { a: '7' };
+           return result;
+         };
+         return ''.replace(re, '$<a>') !== '7';
+       });
 
+       // IE <= 11 replaces $0 with the whole match, as if it was $&
+       // https://stackoverflow.com/questions/6024666/getting-ie-to-replace-a-regex-with-the-literal-string-0
+       var REPLACE_KEEPS_$0 = (function () {
+         return 'a'.replace(/./, '$0') === '$0';
+       })();
 
+       var REPLACE = wellKnownSymbol('replace');
+       // Safari <= 13.0.3(?) substitutes nth capture where n>m with an empty string
+       var REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE = (function () {
+         if (/./[REPLACE]) {
+           return /./[REPLACE]('a', '$0') === '';
+         }
+         return false;
+       })();
 
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-createdataproperty
+       // Chrome 51 has a buggy "split" implementation when RegExp#exec !== nativeExec
+       // Weex JS has frozen built-in prototypes, so use try / catch wrapper
+       var SPLIT_WORKS_WITH_OVERWRITTEN_EXEC = !fails(function () {
+         var re = /(?:)/;
+         var originalExec = re.exec;
+         re.exec = function () { return originalExec.apply(this, arguments); };
+         var result = 'ab'.split(re);
+         return result.length !== 2 || result[0] !== 'a' || result[1] !== 'b';
+       });
 
-       var CreateDataProperty = function CreateDataProperty(O, P, V) {
-               if (Type$1(O) !== 'Object') {
-                       throw new $TypeError$6('Assertion failed: Type(O) is not Object');
-               }
-               if (!IsPropertyKey(P)) {
-                       throw new $TypeError$6('Assertion failed: IsPropertyKey(P) is not true');
-               }
-               var oldDesc = OrdinaryGetOwnProperty(O, P);
-               var extensible = !oldDesc || IsExtensible(O);
-               var immutable = oldDesc && (!oldDesc['[[Writable]]'] || !oldDesc['[[Configurable]]']);
-               if (immutable || !extensible) {
-                       return false;
-               }
-               return DefineOwnProperty(
-                       IsDataDescriptor,
-                       SameValue,
-                       FromPropertyDescriptor,
-                       O,
-                       P,
-                       {
-                               '[[Configurable]]': true,
-                               '[[Enumerable]]': true,
-                               '[[Value]]': V,
-                               '[[Writable]]': true
-                       }
-               );
-       };
+       var fixRegexpWellKnownSymbolLogic = function (KEY, length, exec, sham) {
+         var SYMBOL = wellKnownSymbol(KEY);
 
-       var $TypeError$7 = GetIntrinsic('%TypeError%');
+         var DELEGATES_TO_SYMBOL = !fails(function () {
+           // String methods call symbol-named RegEp methods
+           var O = {};
+           O[SYMBOL] = function () { return 7; };
+           return ''[KEY](O) != 7;
+         });
 
+         var DELEGATES_TO_EXEC = DELEGATES_TO_SYMBOL && !fails(function () {
+           // Symbol-named RegExp methods call .exec
+           var execCalled = false;
+           var re = /a/;
 
+           if (KEY === 'split') {
+             // We can't use real regex here since it causes deoptimization
+             // and serious performance degradation in V8
+             // https://github.com/zloirock/core-js/issues/306
+             re = {};
+             // RegExp[@@split] doesn't call the regex's exec method, but first creates
+             // a new one. We need to return the patched regex when creating the new one.
+             re.constructor = {};
+             re.constructor[SPECIES$6] = function () { return re; };
+             re.flags = '';
+             re[SYMBOL] = /./[SYMBOL];
+           }
 
+           re.exec = function () { execCalled = true; return null; };
 
+           re[SYMBOL]('');
+           return !execCalled;
+         });
 
-       // // https://ecma-international.org/ecma-262/6.0/#sec-createdatapropertyorthrow
+         if (
+           !DELEGATES_TO_SYMBOL ||
+           !DELEGATES_TO_EXEC ||
+           (KEY === 'replace' && !(
+             REPLACE_SUPPORTS_NAMED_GROUPS &&
+             REPLACE_KEEPS_$0 &&
+             !REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE
+           )) ||
+           (KEY === 'split' && !SPLIT_WORKS_WITH_OVERWRITTEN_EXEC)
+         ) {
+           var nativeRegExpMethod = /./[SYMBOL];
+           var methods = exec(SYMBOL, ''[KEY], function (nativeMethod, regexp, str, arg2, forceStringMethod) {
+             if (regexp.exec === regexpExec) {
+               if (DELEGATES_TO_SYMBOL && !forceStringMethod) {
+                 // The native String method already delegates to @@method (this
+                 // polyfilled function), leasing to infinite recursion.
+                 // We avoid it by directly calling the native @@method method.
+                 return { done: true, value: nativeRegExpMethod.call(regexp, str, arg2) };
+               }
+               return { done: true, value: nativeMethod.call(str, regexp, arg2) };
+             }
+             return { done: false };
+           }, {
+             REPLACE_KEEPS_$0: REPLACE_KEEPS_$0,
+             REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE: REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE
+           });
+           var stringMethod = methods[0];
+           var regexMethod = methods[1];
+
+           redefine(String.prototype, KEY, stringMethod);
+           redefine(RegExp.prototype, SYMBOL, length == 2
+             // 21.2.5.8 RegExp.prototype[@@replace](string, replaceValue)
+             // 21.2.5.11 RegExp.prototype[@@split](string, limit)
+             ? function (string, arg) { return regexMethod.call(string, this, arg); }
+             // 21.2.5.6 RegExp.prototype[@@match](string)
+             // 21.2.5.9 RegExp.prototype[@@search](string)
+             : function (string) { return regexMethod.call(string, this); }
+           );
+         }
 
-       var CreateDataPropertyOrThrow = function CreateDataPropertyOrThrow(O, P, V) {
-               if (Type$1(O) !== 'Object') {
-                       throw new $TypeError$7('Assertion failed: Type(O) is not Object');
-               }
-               if (!IsPropertyKey(P)) {
-                       throw new $TypeError$7('Assertion failed: IsPropertyKey(P) is not true');
-               }
-               var success = CreateDataProperty(O, P, V);
-               if (!success) {
-                       throw new $TypeError$7('unable to create data property');
-               }
-               return success;
+         if (sham) createNonEnumerableProperty(RegExp.prototype[SYMBOL], 'sham', true);
        };
 
-       var hasMap = typeof Map === 'function' && Map.prototype;
-       var mapSizeDescriptor = Object.getOwnPropertyDescriptor && hasMap ? Object.getOwnPropertyDescriptor(Map.prototype, 'size') : null;
-       var mapSize = hasMap && mapSizeDescriptor && typeof mapSizeDescriptor.get === 'function' ? mapSizeDescriptor.get : null;
-       var mapForEach = hasMap && Map.prototype.forEach;
-       var hasSet = typeof Set === 'function' && Set.prototype;
-       var setSizeDescriptor = Object.getOwnPropertyDescriptor && hasSet ? Object.getOwnPropertyDescriptor(Set.prototype, 'size') : null;
-       var setSize = hasSet && setSizeDescriptor && typeof setSizeDescriptor.get === 'function' ? setSizeDescriptor.get : null;
-       var setForEach = hasSet && Set.prototype.forEach;
-       var booleanValueOf = Boolean.prototype.valueOf;
-       var objectToString$1 = Object.prototype.toString;
+       var charAt$1 = stringMultibyte.charAt;
 
-       var objectInspect = function inspect_ (obj, opts, depth, seen) {
-           if (typeof obj === 'undefined') {
-               return 'undefined';
-           }
-           if (obj === null) {
-               return 'null';
-           }
-           if (typeof obj === 'boolean') {
-               return obj ? 'true' : 'false';
-           }
-           if (typeof obj === 'string') {
-               return inspectString(obj);
-           }
-           if (typeof obj === 'number') {
-             if (obj === 0) {
-               return Infinity / obj > 0 ? '0' : '-0';
-             }
-             return String(obj);
+       // `AdvanceStringIndex` abstract operation
+       // https://tc39.github.io/ecma262/#sec-advancestringindex
+       var advanceStringIndex = function (S, index, unicode) {
+         return index + (unicode ? charAt$1(S, index).length : 1);
+       };
+
+       // `RegExpExec` abstract operation
+       // https://tc39.github.io/ecma262/#sec-regexpexec
+       var regexpExecAbstract = function (R, S) {
+         var exec = R.exec;
+         if (typeof exec === 'function') {
+           var result = exec.call(R, S);
+           if (typeof result !== 'object') {
+             throw TypeError('RegExp exec method returned something other than an Object or null');
            }
+           return result;
+         }
 
-           if (!opts) opts = {};
+         if (classofRaw(R) !== 'RegExp') {
+           throw TypeError('RegExp#exec called on incompatible receiver');
+         }
 
-           var maxDepth = typeof opts.depth === 'undefined' ? 5 : opts.depth;
-           if (typeof depth === 'undefined') depth = 0;
-           if (depth >= maxDepth && maxDepth > 0 && typeof obj === 'object') {
-               return '[Object]';
-           }
+         return regexpExec.call(R, S);
+       };
 
-           if (typeof seen === 'undefined') seen = [];
-           else if (indexOf$2(seen, obj) >= 0) {
-               return '[Circular]';
-           }
+       var max$2 = Math.max;
+       var min$2 = Math.min;
+       var floor$2 = Math.floor;
+       var SUBSTITUTION_SYMBOLS = /\$([$&'`]|\d\d?|<[^>]*>)/g;
+       var SUBSTITUTION_SYMBOLS_NO_NAMED = /\$([$&'`]|\d\d?)/g;
+
+       var maybeToString = function (it) {
+         return it === undefined ? it : String(it);
+       };
 
-           function inspect (value, from) {
-               if (from) {
-                   seen = seen.slice();
-                   seen.push(from);
+       // @@replace logic
+       fixRegexpWellKnownSymbolLogic('replace', 2, function (REPLACE, nativeReplace, maybeCallNative, reason) {
+         var REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE = reason.REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE;
+         var REPLACE_KEEPS_$0 = reason.REPLACE_KEEPS_$0;
+         var UNSAFE_SUBSTITUTE = REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE ? '$' : '$0';
+
+         return [
+           // `String.prototype.replace` method
+           // https://tc39.github.io/ecma262/#sec-string.prototype.replace
+           function replace(searchValue, replaceValue) {
+             var O = requireObjectCoercible(this);
+             var replacer = searchValue == undefined ? undefined : searchValue[REPLACE];
+             return replacer !== undefined
+               ? replacer.call(searchValue, O, replaceValue)
+               : nativeReplace.call(String(O), searchValue, replaceValue);
+           },
+           // `RegExp.prototype[@@replace]` method
+           // https://tc39.github.io/ecma262/#sec-regexp.prototype-@@replace
+           function (regexp, replaceValue) {
+             if (
+               (!REGEXP_REPLACE_SUBSTITUTES_UNDEFINED_CAPTURE && REPLACE_KEEPS_$0) ||
+               (typeof replaceValue === 'string' && replaceValue.indexOf(UNSAFE_SUBSTITUTE) === -1)
+             ) {
+               var res = maybeCallNative(nativeReplace, regexp, this, replaceValue);
+               if (res.done) return res.value;
+             }
+
+             var rx = anObject(regexp);
+             var S = String(this);
+
+             var functionalReplace = typeof replaceValue === 'function';
+             if (!functionalReplace) replaceValue = String(replaceValue);
+
+             var global = rx.global;
+             if (global) {
+               var fullUnicode = rx.unicode;
+               rx.lastIndex = 0;
+             }
+             var results = [];
+             while (true) {
+               var result = regexpExecAbstract(rx, S);
+               if (result === null) break;
+
+               results.push(result);
+               if (!global) break;
+
+               var matchStr = String(result[0]);
+               if (matchStr === '') rx.lastIndex = advanceStringIndex(S, toLength(rx.lastIndex), fullUnicode);
+             }
+
+             var accumulatedResult = '';
+             var nextSourcePosition = 0;
+             for (var i = 0; i < results.length; i++) {
+               result = results[i];
+
+               var matched = String(result[0]);
+               var position = max$2(min$2(toInteger(result.index), S.length), 0);
+               var captures = [];
+               // NOTE: This is equivalent to
+               //   captures = result.slice(1).map(maybeToString)
+               // but for some reason `nativeSlice.call(result, 1, result.length)` (called in
+               // the slice polyfill when slicing native arrays) "doesn't work" in safari 9 and
+               // causes a crash (https://pastebin.com/N21QzeQA) when trying to debug it.
+               for (var j = 1; j < result.length; j++) captures.push(maybeToString(result[j]));
+               var namedCaptures = result.groups;
+               if (functionalReplace) {
+                 var replacerArgs = [matched].concat(captures, position, S);
+                 if (namedCaptures !== undefined) replacerArgs.push(namedCaptures);
+                 var replacement = String(replaceValue.apply(undefined, replacerArgs));
+               } else {
+                 replacement = getSubstitution(matched, S, position, captures, namedCaptures, replaceValue);
+               }
+               if (position >= nextSourcePosition) {
+                 accumulatedResult += S.slice(nextSourcePosition, position) + replacement;
+                 nextSourcePosition = position + matched.length;
                }
-               return inspect_(value, opts, depth + 1, seen);
+             }
+             return accumulatedResult + S.slice(nextSourcePosition);
            }
+         ];
 
-           if (typeof obj === 'function') {
-               var name = nameOf(obj);
-               return '[Function' + (name ? ': ' + name : '') + ']';
-           }
-           if (isSymbol$3(obj)) {
-               var symString = Symbol.prototype.toString.call(obj);
-               return typeof obj === 'object' ? markBoxed(symString) : symString;
-           }
-           if (isElement(obj)) {
-               var s = '<' + String(obj.nodeName).toLowerCase();
-               var attrs = obj.attributes || [];
-               for (var i = 0; i < attrs.length; i++) {
-                   s += ' ' + attrs[i].name + '="' + quote(attrs[i].value) + '"';
+         // https://tc39.github.io/ecma262/#sec-getsubstitution
+         function getSubstitution(matched, str, position, captures, namedCaptures, replacement) {
+           var tailPos = position + matched.length;
+           var m = captures.length;
+           var symbols = SUBSTITUTION_SYMBOLS_NO_NAMED;
+           if (namedCaptures !== undefined) {
+             namedCaptures = toObject(namedCaptures);
+             symbols = SUBSTITUTION_SYMBOLS;
+           }
+           return nativeReplace.call(replacement, symbols, function (match, ch) {
+             var capture;
+             switch (ch.charAt(0)) {
+               case '$': return '$';
+               case '&': return matched;
+               case '`': return str.slice(0, position);
+               case "'": return str.slice(tailPos);
+               case '<':
+                 capture = namedCaptures[ch.slice(1, -1)];
+                 break;
+               default: // \d\d?
+                 var n = +ch;
+                 if (n === 0) return match;
+                 if (n > m) {
+                   var f = floor$2(n / 10);
+                   if (f === 0) return match;
+                   if (f <= m) return captures[f - 1] === undefined ? ch.charAt(1) : captures[f - 1] + ch.charAt(1);
+                   return match;
+                 }
+                 capture = captures[n - 1];
+             }
+             return capture === undefined ? '' : capture;
+           });
+         }
+       });
+
+       var MATCH = wellKnownSymbol('match');
+
+       // `IsRegExp` abstract operation
+       // https://tc39.github.io/ecma262/#sec-isregexp
+       var isRegexp = function (it) {
+         var isRegExp;
+         return isObject(it) && ((isRegExp = it[MATCH]) !== undefined ? !!isRegExp : classofRaw(it) == 'RegExp');
+       };
+
+       var arrayPush = [].push;
+       var min$3 = Math.min;
+       var MAX_UINT32 = 0xFFFFFFFF;
+
+       // babel-minify transpiles RegExp('x', 'y') -> /x/y and it causes SyntaxError
+       var SUPPORTS_Y = !fails(function () { return !RegExp(MAX_UINT32, 'y'); });
+
+       // @@split logic
+       fixRegexpWellKnownSymbolLogic('split', 2, function (SPLIT, nativeSplit, maybeCallNative) {
+         var internalSplit;
+         if (
+           'abbc'.split(/(b)*/)[1] == 'c' ||
+           'test'.split(/(?:)/, -1).length != 4 ||
+           'ab'.split(/(?:ab)*/).length != 2 ||
+           '.'.split(/(.?)(.?)/).length != 4 ||
+           '.'.split(/()()/).length > 1 ||
+           ''.split(/.?/).length
+         ) {
+           // based on es5-shim implementation, need to rework it
+           internalSplit = function (separator, limit) {
+             var string = String(requireObjectCoercible(this));
+             var lim = limit === undefined ? MAX_UINT32 : limit >>> 0;
+             if (lim === 0) return [];
+             if (separator === undefined) return [string];
+             // If `separator` is not a regex, use native split
+             if (!isRegexp(separator)) {
+               return nativeSplit.call(string, separator, lim);
+             }
+             var output = [];
+             var flags = (separator.ignoreCase ? 'i' : '') +
+                         (separator.multiline ? 'm' : '') +
+                         (separator.unicode ? 'u' : '') +
+                         (separator.sticky ? 'y' : '');
+             var lastLastIndex = 0;
+             // Make `global` and avoid `lastIndex` issues by working with a copy
+             var separatorCopy = new RegExp(separator.source, flags + 'g');
+             var match, lastIndex, lastLength;
+             while (match = regexpExec.call(separatorCopy, string)) {
+               lastIndex = separatorCopy.lastIndex;
+               if (lastIndex > lastLastIndex) {
+                 output.push(string.slice(lastLastIndex, match.index));
+                 if (match.length > 1 && match.index < string.length) arrayPush.apply(output, match.slice(1));
+                 lastLength = match[0].length;
+                 lastLastIndex = lastIndex;
+                 if (output.length >= lim) break;
+               }
+               if (separatorCopy.lastIndex === match.index) separatorCopy.lastIndex++; // Avoid an infinite loop
+             }
+             if (lastLastIndex === string.length) {
+               if (lastLength || !separatorCopy.test('')) output.push('');
+             } else output.push(string.slice(lastLastIndex));
+             return output.length > lim ? output.slice(0, lim) : output;
+           };
+         // Chakra, V8
+         } else if ('0'.split(undefined, 0).length) {
+           internalSplit = function (separator, limit) {
+             return separator === undefined && limit === 0 ? [] : nativeSplit.call(this, separator, limit);
+           };
+         } else internalSplit = nativeSplit;
+
+         return [
+           // `String.prototype.split` method
+           // https://tc39.github.io/ecma262/#sec-string.prototype.split
+           function split(separator, limit) {
+             var O = requireObjectCoercible(this);
+             var splitter = separator == undefined ? undefined : separator[SPLIT];
+             return splitter !== undefined
+               ? splitter.call(separator, O, limit)
+               : internalSplit.call(String(O), separator, limit);
+           },
+           // `RegExp.prototype[@@split]` method
+           // https://tc39.github.io/ecma262/#sec-regexp.prototype-@@split
+           //
+           // NOTE: This cannot be properly polyfilled in engines that don't support
+           // the 'y' flag.
+           function (regexp, limit) {
+             var res = maybeCallNative(internalSplit, regexp, this, limit, internalSplit !== nativeSplit);
+             if (res.done) return res.value;
+
+             var rx = anObject(regexp);
+             var S = String(this);
+             var C = speciesConstructor(rx, RegExp);
+
+             var unicodeMatching = rx.unicode;
+             var flags = (rx.ignoreCase ? 'i' : '') +
+                         (rx.multiline ? 'm' : '') +
+                         (rx.unicode ? 'u' : '') +
+                         (SUPPORTS_Y ? 'y' : 'g');
+
+             // ^(? + rx + ) is needed, in combination with some S slicing, to
+             // simulate the 'y' flag.
+             var splitter = new C(SUPPORTS_Y ? rx : '^(?:' + rx.source + ')', flags);
+             var lim = limit === undefined ? MAX_UINT32 : limit >>> 0;
+             if (lim === 0) return [];
+             if (S.length === 0) return regexpExecAbstract(splitter, S) === null ? [S] : [];
+             var p = 0;
+             var q = 0;
+             var A = [];
+             while (q < S.length) {
+               splitter.lastIndex = SUPPORTS_Y ? q : 0;
+               var z = regexpExecAbstract(splitter, SUPPORTS_Y ? S : S.slice(q));
+               var e;
+               if (
+                 z === null ||
+                 (e = min$3(toLength(splitter.lastIndex + (SUPPORTS_Y ? 0 : q)), S.length)) === p
+               ) {
+                 q = advanceStringIndex(S, q, unicodeMatching);
+               } else {
+                 A.push(S.slice(p, q));
+                 if (A.length === lim) return A;
+                 for (var i = 1; i <= z.length - 1; i++) {
+                   A.push(z[i]);
+                   if (A.length === lim) return A;
+                 }
+                 q = p = e;
                }
-               s += '>';
-               if (obj.childNodes && obj.childNodes.length) s += '...';
-               s += '</' + String(obj.nodeName).toLowerCase() + '>';
-               return s;
-           }
-           if (isArray$3(obj)) {
-               if (obj.length === 0) return '[]';
-               return '[ ' + arrObjKeys(obj, inspect).join(', ') + ' ]';
-           }
-           if (isError(obj)) {
-               var parts = arrObjKeys(obj, inspect);
-               if (parts.length === 0) return '[' + String(obj) + ']';
-               return '{ [' + String(obj) + '] ' + parts.join(', ') + ' }';
-           }
-           if (typeof obj === 'object' && typeof obj.inspect === 'function') {
-               return obj.inspect();
-           }
-           if (isMap(obj)) {
-               var parts = [];
-               mapForEach.call(obj, function (value, key) {
-                   parts.push(inspect(key, obj) + ' => ' + inspect(value, obj));
-               });
-               return collectionOf('Map', mapSize.call(obj), parts);
-           }
-           if (isSet(obj)) {
-               var parts = [];
-               setForEach.call(obj, function (value ) {
-                   parts.push(inspect(value, obj));
-               });
-               return collectionOf('Set', setSize.call(obj), parts);
-           }
-           if (isNumber(obj)) {
-               return markBoxed(Number(obj));
-           }
-           if (isBoolean(obj)) {
-               return markBoxed(booleanValueOf.call(obj));
-           }
-           if (isString$1(obj)) {
-               return markBoxed(inspect(String(obj)));
-           }
-           if (!isDate(obj) && !isRegExp(obj)) {
-               var xs = arrObjKeys(obj, inspect);
-               if (xs.length === 0) return '{}';
-               return '{ ' + xs.join(', ') + ' }';
+             }
+             A.push(S.slice(p));
+             return A;
            }
-           return String(obj);
+         ];
+       }, !SUPPORTS_Y);
+
+       // a string of all valid unicode whitespaces
+       // eslint-disable-next-line max-len
+       var whitespaces = '\u0009\u000A\u000B\u000C\u000D\u0020\u00A0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF';
+
+       var whitespace = '[' + whitespaces + ']';
+       var ltrim = RegExp('^' + whitespace + whitespace + '*');
+       var rtrim = RegExp(whitespace + whitespace + '*$');
+
+       // `String.prototype.{ trim, trimStart, trimEnd, trimLeft, trimRight }` methods implementation
+       var createMethod$3 = function (TYPE) {
+         return function ($this) {
+           var string = String(requireObjectCoercible($this));
+           if (TYPE & 1) string = string.replace(ltrim, '');
+           if (TYPE & 2) string = string.replace(rtrim, '');
+           return string;
+         };
        };
 
-       function quote (s) {
-           return String(s).replace(/"/g, '&quot;');
-       }
+       var stringTrim = {
+         // `String.prototype.{ trimLeft, trimStart }` methods
+         // https://tc39.github.io/ecma262/#sec-string.prototype.trimstart
+         start: createMethod$3(1),
+         // `String.prototype.{ trimRight, trimEnd }` methods
+         // https://tc39.github.io/ecma262/#sec-string.prototype.trimend
+         end: createMethod$3(2),
+         // `String.prototype.trim` method
+         // https://tc39.github.io/ecma262/#sec-string.prototype.trim
+         trim: createMethod$3(3)
+       };
 
-       function isArray$3 (obj) { return toStr$8(obj) === '[object Array]' }
-       function isDate (obj) { return toStr$8(obj) === '[object Date]' }
-       function isRegExp (obj) { return toStr$8(obj) === '[object RegExp]' }
-       function isError (obj) { return toStr$8(obj) === '[object Error]' }
-       function isSymbol$3 (obj) { return toStr$8(obj) === '[object Symbol]' }
-       function isString$1 (obj) { return toStr$8(obj) === '[object String]' }
-       function isNumber (obj) { return toStr$8(obj) === '[object Number]' }
-       function isBoolean (obj) { return toStr$8(obj) === '[object Boolean]' }
+       var non = '\u200B\u0085\u180E';
 
-       var hasOwn = Object.prototype.hasOwnProperty || function (key) { return key in this; };
-       function has$1 (obj, key) {
-           return hasOwn.call(obj, key);
-       }
+       // check that a method works with the correct list
+       // of whitespaces and has a correct name
+       var stringTrimForced = function (METHOD_NAME) {
+         return fails(function () {
+           return !!whitespaces[METHOD_NAME]() || non[METHOD_NAME]() != non || whitespaces[METHOD_NAME].name !== METHOD_NAME;
+         });
+       };
 
-       function toStr$8 (obj) {
-           return objectToString$1.call(obj);
-       }
+       var $trim = stringTrim.trim;
 
-       function nameOf (f) {
-           if (f.name) return f.name;
-           var m = String(f).match(/^function\s*([\w$]+)/);
-           if (m) return m[1];
-       }
 
-       function indexOf$2 (xs, x) {
-           if (xs.indexOf) return xs.indexOf(x);
-           for (var i = 0, l = xs.length; i < l; i++) {
-               if (xs[i] === x) return i;
-           }
-           return -1;
-       }
+       // `String.prototype.trim` method
+       // https://tc39.github.io/ecma262/#sec-string.prototype.trim
+       _export({ target: 'String', proto: true, forced: stringTrimForced('trim') }, {
+         trim: function trim() {
+           return $trim(this);
+         }
+       });
 
-       function isMap (x) {
-           if (!mapSize) {
-               return false;
-           }
-           try {
-               mapSize.call(x);
-               try {
-                   setSize.call(x);
-               } catch (s) {
-                   return true;
-               }
-               return x instanceof Map; // core-js workaround, pre-v2.5.0
-           } catch (e) {}
-           return false;
-       }
+       /* eslint-disable no-new */
 
-       function isSet (x) {
-           if (!setSize) {
-               return false;
-           }
-           try {
-               setSize.call(x);
-               try {
-                   mapSize.call(x);
-               } catch (m) {
-                   return true;
-               }
-               return x instanceof Set; // core-js workaround, pre-v2.5.0
-           } catch (e) {}
-           return false;
-       }
 
-       function isElement (x) {
-           if (!x || typeof x !== 'object') return false;
-           if (typeof HTMLElement !== 'undefined' && x instanceof HTMLElement) {
-               return true;
-           }
-           return typeof x.nodeName === 'string'
-               && typeof x.getAttribute === 'function'
-           ;
-       }
 
-       function inspectString (str) {
-           var s = str.replace(/(['\\])/g, '\\$1').replace(/[\x00-\x1f]/g, lowbyte);
-           return "'" + s + "'";
-       }
+       var NATIVE_ARRAY_BUFFER_VIEWS$2 = arrayBufferViewCore.NATIVE_ARRAY_BUFFER_VIEWS;
 
-       function lowbyte (c) {
-           var n = c.charCodeAt(0);
-           var x = { 8: 'b', 9: 't', 10: 'n', 12: 'f', 13: 'r' }[n];
-           if (x) return '\\' + x;
-           return '\\x' + (n < 0x10 ? '0' : '') + n.toString(16);
-       }
+       var ArrayBuffer$3 = global_1.ArrayBuffer;
+       var Int8Array$2 = global_1.Int8Array;
 
-       function markBoxed (str) {
-           return 'Object(' + str + ')';
-       }
+       var typedArrayConstructorsRequireWrappers = !NATIVE_ARRAY_BUFFER_VIEWS$2 || !fails(function () {
+         Int8Array$2(1);
+       }) || !fails(function () {
+         new Int8Array$2(-1);
+       }) || !checkCorrectnessOfIteration(function (iterable) {
+         new Int8Array$2();
+         new Int8Array$2(null);
+         new Int8Array$2(1.5);
+         new Int8Array$2(iterable);
+       }, true) || fails(function () {
+         // Safari (11+) bug - a reason why even Safari 13 should load a typed array polyfill
+         return new Int8Array$2(new ArrayBuffer$3(2), 1, undefined).length !== 1;
+       });
 
-       function collectionOf (type, size, entries) {
-           return type + ' (' + size + ') {' + entries.join(', ') + '}';
-       }
+       var toPositiveInteger = function (it) {
+         var result = toInteger(it);
+         if (result < 0) throw RangeError("The argument can't be less than 0");
+         return result;
+       };
 
-       function arrObjKeys (obj, inspect) {
-           var isArr = isArray$3(obj);
-           var xs = [];
-           if (isArr) {
-               xs.length = obj.length;
-               for (var i = 0; i < obj.length; i++) {
-                   xs[i] = has$1(obj, i) ? inspect(obj[i], obj) : '';
-               }
-           }
-           for (var key in obj) {
-               if (!has$1(obj, key)) continue;
-               if (isArr && String(Number(key)) === key && key < obj.length) continue;
-               if (/[^\w$]/.test(key)) {
-                   xs.push(inspect(key, obj) + ': ' + inspect(obj[key], obj));
-               } else {
-                   xs.push(key + ': ' + inspect(obj[key], obj));
-               }
+       var toOffset = function (it, BYTES) {
+         var offset = toPositiveInteger(it);
+         if (offset % BYTES) throw RangeError('Wrong offset');
+         return offset;
+       };
+
+       var aTypedArrayConstructor$1 = arrayBufferViewCore.aTypedArrayConstructor;
+
+       var typedArrayFrom = function from(source /* , mapfn, thisArg */) {
+         var O = toObject(source);
+         var argumentsLength = arguments.length;
+         var mapfn = argumentsLength > 1 ? arguments[1] : undefined;
+         var mapping = mapfn !== undefined;
+         var iteratorMethod = getIteratorMethod(O);
+         var i, length, result, step, iterator, next;
+         if (iteratorMethod != undefined && !isArrayIteratorMethod(iteratorMethod)) {
+           iterator = iteratorMethod.call(O);
+           next = iterator.next;
+           O = [];
+           while (!(step = next.call(iterator)).done) {
+             O.push(step.value);
            }
-           return xs;
-       }
+         }
+         if (mapping && argumentsLength > 2) {
+           mapfn = functionBindContext(mapfn, arguments[2], 2);
+         }
+         length = toLength(O.length);
+         result = new (aTypedArrayConstructor$1(this))(length);
+         for (i = 0; length > i; i++) {
+           result[i] = mapping ? mapfn(O[i], i) : O[i];
+         }
+         return result;
+       };
 
-       var $TypeError$8 = GetIntrinsic('%TypeError%');
+       // makes subclassing work correct for wrapped built-ins
+       var inheritIfRequired = function ($this, dummy, Wrapper) {
+         var NewTarget, NewTargetPrototype;
+         if (
+           // it can work only with native `setPrototypeOf`
+           objectSetPrototypeOf &&
+           // we haven't completely correct pre-ES6 way for getting `new.target`, so use this
+           typeof (NewTarget = dummy.constructor) == 'function' &&
+           NewTarget !== Wrapper &&
+           isObject(NewTargetPrototype = NewTarget.prototype) &&
+           NewTargetPrototype !== Wrapper.prototype
+         ) objectSetPrototypeOf($this, NewTargetPrototype);
+         return $this;
+       };
 
+       var typedArrayConstructor = createCommonjsModule(function (module) {
 
 
 
 
 
-       /**
-        * 7.3.1 Get (O, P) - https://ecma-international.org/ecma-262/6.0/#sec-get-o-p
-        * 1. Assert: Type(O) is Object.
-        * 2. Assert: IsPropertyKey(P) is true.
-        * 3. Return O.[[Get]](P, O).
-        */
 
-       var Get = function Get(O, P) {
-               // 7.3.1.1
-               if (Type$1(O) !== 'Object') {
-                       throw new $TypeError$8('Assertion failed: Type(O) is not Object');
-               }
-               // 7.3.1.2
-               if (!IsPropertyKey(P)) {
-                       throw new $TypeError$8('Assertion failed: IsPropertyKey(P) is not true, got ' + objectInspect(P));
-               }
-               // 7.3.1.3
-               return O[P];
-       };
 
-       var $TypeError$9 = GetIntrinsic('%TypeError%');
-
-       var isPropertyDescriptor = function IsPropertyDescriptor(ES, Desc) {
-               if (ES.Type(Desc) !== 'Object') {
-                       return false;
-               }
-               var allowed = {
-                       '[[Configurable]]': true,
-                       '[[Enumerable]]': true,
-                       '[[Get]]': true,
-                       '[[Set]]': true,
-                       '[[Value]]': true,
-                       '[[Writable]]': true
-               };
-
-               for (var key in Desc) { // eslint-disable-line no-restricted-syntax
-                       if (src(Desc, key) && !allowed[key]) {
-                               return false;
-                       }
-               }
 
-               if (ES.IsDataDescriptor(Desc) && ES.IsAccessorDescriptor(Desc)) {
-                       throw new $TypeError$9('Property Descriptors may not be both accessor and data descriptors');
-               }
-               return true;
-       };
 
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-isaccessordescriptor
 
-       var IsAccessorDescriptor = function IsAccessorDescriptor(Desc) {
-               if (typeof Desc === 'undefined') {
-                       return false;
-               }
 
-               assertRecord(Type$1, 'Property Descriptor', 'Desc', Desc);
 
-               if (!src(Desc, '[[Get]]') && !src(Desc, '[[Set]]')) {
-                       return false;
-               }
 
-               return true;
-       };
 
-       var $TypeError$a = GetIntrinsic('%TypeError%');
 
 
 
 
+       var getOwnPropertyNames = objectGetOwnPropertyNames.f;
 
+       var forEach = arrayIteration.forEach;
 
 
 
 
 
 
+       var getInternalState = internalState.get;
+       var setInternalState = internalState.set;
+       var nativeDefineProperty = objectDefineProperty.f;
+       var nativeGetOwnPropertyDescriptor = objectGetOwnPropertyDescriptor.f;
+       var round = Math.round;
+       var RangeError = global_1.RangeError;
+       var ArrayBuffer = arrayBuffer.ArrayBuffer;
+       var DataView = arrayBuffer.DataView;
+       var NATIVE_ARRAY_BUFFER_VIEWS = arrayBufferViewCore.NATIVE_ARRAY_BUFFER_VIEWS;
+       var TYPED_ARRAY_TAG = arrayBufferViewCore.TYPED_ARRAY_TAG;
+       var TypedArray = arrayBufferViewCore.TypedArray;
+       var TypedArrayPrototype = arrayBufferViewCore.TypedArrayPrototype;
+       var aTypedArrayConstructor = arrayBufferViewCore.aTypedArrayConstructor;
+       var isTypedArray = arrayBufferViewCore.isTypedArray;
+       var BYTES_PER_ELEMENT = 'BYTES_PER_ELEMENT';
+       var WRONG_LENGTH = 'Wrong length';
 
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-definepropertyorthrow
+       var fromList = function (C, list) {
+         var index = 0;
+         var length = list.length;
+         var result = new (aTypedArrayConstructor(C))(length);
+         while (length > index) result[index] = list[index++];
+         return result;
+       };
 
-       var DefinePropertyOrThrow = function DefinePropertyOrThrow(O, P, desc) {
-               if (Type$1(O) !== 'Object') {
-                       throw new $TypeError$a('Assertion failed: Type(O) is not Object');
-               }
+       var addGetter = function (it, key) {
+         nativeDefineProperty(it, key, { get: function () {
+           return getInternalState(this)[key];
+         } });
+       };
 
-               if (!IsPropertyKey(P)) {
-                       throw new $TypeError$a('Assertion failed: IsPropertyKey(P) is not true');
-               }
+       var isArrayBuffer = function (it) {
+         var klass;
+         return it instanceof ArrayBuffer || (klass = classof(it)) == 'ArrayBuffer' || klass == 'SharedArrayBuffer';
+       };
 
-               var Desc = isPropertyDescriptor({
-                       Type: Type$1,
-                       IsDataDescriptor: IsDataDescriptor,
-                       IsAccessorDescriptor: IsAccessorDescriptor
-               }, desc) ? desc : ToPropertyDescriptor(desc);
-               if (!isPropertyDescriptor({
-                       Type: Type$1,
-                       IsDataDescriptor: IsDataDescriptor,
-                       IsAccessorDescriptor: IsAccessorDescriptor
-               }, Desc)) {
-                       throw new $TypeError$a('Assertion failed: Desc is not a valid Property Descriptor');
-               }
+       var isTypedArrayIndex = function (target, key) {
+         return isTypedArray(target)
+           && typeof key != 'symbol'
+           && key in target
+           && String(+key) == String(key);
+       };
 
-               return DefineOwnProperty(
-                       IsDataDescriptor,
-                       SameValue,
-                       FromPropertyDescriptor,
-                       O,
-                       P,
-                       Desc
-               );
+       var wrappedGetOwnPropertyDescriptor = function getOwnPropertyDescriptor(target, key) {
+         return isTypedArrayIndex(target, key = toPrimitive(key, true))
+           ? createPropertyDescriptor(2, target[key])
+           : nativeGetOwnPropertyDescriptor(target, key);
        };
 
-       var IsConstructor = createCommonjsModule(function (module) {
+       var wrappedDefineProperty = function defineProperty(target, key, descriptor) {
+         if (isTypedArrayIndex(target, key = toPrimitive(key, true))
+           && isObject(descriptor)
+           && has(descriptor, 'value')
+           && !has(descriptor, 'get')
+           && !has(descriptor, 'set')
+           // TODO: add validation descriptor w/o calling accessors
+           && !descriptor.configurable
+           && (!has(descriptor, 'writable') || descriptor.writable)
+           && (!has(descriptor, 'enumerable') || descriptor.enumerable)
+         ) {
+           target[key] = descriptor.value;
+           return target;
+         } return nativeDefineProperty(target, key, descriptor);
+       };
 
+       if (descriptors) {
+         if (!NATIVE_ARRAY_BUFFER_VIEWS) {
+           objectGetOwnPropertyDescriptor.f = wrappedGetOwnPropertyDescriptor;
+           objectDefineProperty.f = wrappedDefineProperty;
+           addGetter(TypedArrayPrototype, 'buffer');
+           addGetter(TypedArrayPrototype, 'byteOffset');
+           addGetter(TypedArrayPrototype, 'byteLength');
+           addGetter(TypedArrayPrototype, 'length');
+         }
 
+         _export({ target: 'Object', stat: true, forced: !NATIVE_ARRAY_BUFFER_VIEWS }, {
+           getOwnPropertyDescriptor: wrappedGetOwnPropertyDescriptor,
+           defineProperty: wrappedDefineProperty
+         });
 
-       var $construct = GetIntrinsic('%Reflect.construct%', true);
+         module.exports = function (TYPE, wrapper, CLAMPED) {
+           var BYTES = TYPE.match(/\d+$/)[0] / 8;
+           var CONSTRUCTOR_NAME = TYPE + (CLAMPED ? 'Clamped' : '') + 'Array';
+           var GETTER = 'get' + TYPE;
+           var SETTER = 'set' + TYPE;
+           var NativeTypedArrayConstructor = global_1[CONSTRUCTOR_NAME];
+           var TypedArrayConstructor = NativeTypedArrayConstructor;
+           var TypedArrayConstructorPrototype = TypedArrayConstructor && TypedArrayConstructor.prototype;
+           var exported = {};
 
-       var DefinePropertyOrThrow$1 = DefinePropertyOrThrow;
-       try {
-               DefinePropertyOrThrow$1({}, '', { '[[Get]]': function () {} });
-       } catch (e) {
-               // Accessor properties aren't supported
-               DefinePropertyOrThrow$1 = null;
-       }
-
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-isconstructor
-
-       if (DefinePropertyOrThrow$1 && $construct) {
-               var isConstructorMarker = {};
-               var badArrayLike = {};
-               DefinePropertyOrThrow$1(badArrayLike, 'length', {
-                       '[[Get]]': function () {
-                               throw isConstructorMarker;
-                       },
-                       '[[Enumerable]]': true
-               });
-
-               module.exports = function IsConstructor(argument) {
-                       try {
-                               // `Reflect.construct` invokes `IsConstructor(target)` before `Get(args, 'length')`:
-                               $construct(argument, badArrayLike);
-                       } catch (err) {
-                               return err === isConstructorMarker;
-                       }
-               };
-       } else {
-               module.exports = function IsConstructor(argument) {
-                       // unfortunately there's no way to truly check this without try/catch `new argument` in old environments
-                       return typeof argument === 'function' && !!argument.prototype;
-               };
-       }
-       });
+           var getter = function (that, index) {
+             var data = getInternalState(that);
+             return data.view[GETTER](index * BYTES + data.byteOffset, true);
+           };
 
-       var $String = GetIntrinsic('%String%');
-       var $TypeError$b = GetIntrinsic('%TypeError%');
+           var setter = function (that, index, value) {
+             var data = getInternalState(that);
+             if (CLAMPED) value = (value = round(value)) < 0 ? 0 : value > 0xFF ? 0xFF : value & 0xFF;
+             data.view[SETTER](index * BYTES + data.byteOffset, value, true);
+           };
 
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-tostring
+           var addElement = function (that, index) {
+             nativeDefineProperty(that, index, {
+               get: function () {
+                 return getter(this, index);
+               },
+               set: function (value) {
+                 return setter(this, index, value);
+               },
+               enumerable: true
+             });
+           };
 
-       var ToString = function ToString(argument) {
-               if (typeof argument === 'symbol') {
-                       throw new $TypeError$b('Cannot convert a Symbol value to a string');
-               }
-               return $String(argument);
-       };
+           if (!NATIVE_ARRAY_BUFFER_VIEWS) {
+             TypedArrayConstructor = wrapper(function (that, data, offset, $length) {
+               anInstance(that, TypedArrayConstructor, CONSTRUCTOR_NAME);
+               var index = 0;
+               var byteOffset = 0;
+               var buffer, byteLength, length;
+               if (!isObject(data)) {
+                 length = toIndex(data);
+                 byteLength = length * BYTES;
+                 buffer = new ArrayBuffer(byteLength);
+               } else if (isArrayBuffer(data)) {
+                 buffer = data;
+                 byteOffset = toOffset(offset, BYTES);
+                 var $len = data.byteLength;
+                 if ($length === undefined) {
+                   if ($len % BYTES) throw RangeError(WRONG_LENGTH);
+                   byteLength = $len - byteOffset;
+                   if (byteLength < 0) throw RangeError(WRONG_LENGTH);
+                 } else {
+                   byteLength = toLength($length) * BYTES;
+                   if (byteLength + byteOffset > $len) throw RangeError(WRONG_LENGTH);
+                 }
+                 length = byteLength / BYTES;
+               } else if (isTypedArray(data)) {
+                 return fromList(TypedArrayConstructor, data);
+               } else {
+                 return typedArrayFrom.call(TypedArrayConstructor, data);
+               }
+               setInternalState(that, {
+                 buffer: buffer,
+                 byteOffset: byteOffset,
+                 byteLength: byteLength,
+                 length: length,
+                 view: new DataView(buffer)
+               });
+               while (index < length) addElement(that, index++);
+             });
 
-       var hasToStringTag$3 = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
-       var toStr$9 = Object.prototype.toString;
+             if (objectSetPrototypeOf) objectSetPrototypeOf(TypedArrayConstructor, TypedArray);
+             TypedArrayConstructorPrototype = TypedArrayConstructor.prototype = objectCreate(TypedArrayPrototype);
+           } else if (typedArrayConstructorsRequireWrappers) {
+             TypedArrayConstructor = wrapper(function (dummy, data, typedArrayOffset, $length) {
+               anInstance(dummy, TypedArrayConstructor, CONSTRUCTOR_NAME);
+               return inheritIfRequired(function () {
+                 if (!isObject(data)) return new NativeTypedArrayConstructor(toIndex(data));
+                 if (isArrayBuffer(data)) return $length !== undefined
+                   ? new NativeTypedArrayConstructor(data, toOffset(typedArrayOffset, BYTES), $length)
+                   : typedArrayOffset !== undefined
+                     ? new NativeTypedArrayConstructor(data, toOffset(typedArrayOffset, BYTES))
+                     : new NativeTypedArrayConstructor(data);
+                 if (isTypedArray(data)) return fromList(TypedArrayConstructor, data);
+                 return typedArrayFrom.call(TypedArrayConstructor, data);
+               }(), dummy, TypedArrayConstructor);
+             });
 
-       var isStandardArguments = function isArguments(value) {
-               if (hasToStringTag$3 && value && typeof value === 'object' && Symbol.toStringTag in value) {
-                       return false;
-               }
-               return toStr$9.call(value) === '[object Arguments]';
-       };
+             if (objectSetPrototypeOf) objectSetPrototypeOf(TypedArrayConstructor, TypedArray);
+             forEach(getOwnPropertyNames(NativeTypedArrayConstructor), function (key) {
+               if (!(key in TypedArrayConstructor)) {
+                 createNonEnumerableProperty(TypedArrayConstructor, key, NativeTypedArrayConstructor[key]);
+               }
+             });
+             TypedArrayConstructor.prototype = TypedArrayConstructorPrototype;
+           }
 
-       var isLegacyArguments = function isArguments(value) {
-               if (isStandardArguments(value)) {
-                       return true;
-               }
-               return value !== null &&
-                       typeof value === 'object' &&
-                       typeof value.length === 'number' &&
-                       value.length >= 0 &&
-                       toStr$9.call(value) !== '[object Array]' &&
-                       toStr$9.call(value.callee) === '[object Function]';
-       };
+           if (TypedArrayConstructorPrototype.constructor !== TypedArrayConstructor) {
+             createNonEnumerableProperty(TypedArrayConstructorPrototype, 'constructor', TypedArrayConstructor);
+           }
 
-       var supportsStandardArguments = (function () {
-               return isStandardArguments(arguments);
-       }());
+           if (TYPED_ARRAY_TAG) {
+             createNonEnumerableProperty(TypedArrayConstructorPrototype, TYPED_ARRAY_TAG, CONSTRUCTOR_NAME);
+           }
 
-       isStandardArguments.isLegacyArguments = isLegacyArguments; // for tests
+           exported[CONSTRUCTOR_NAME] = TypedArrayConstructor;
 
-       var isArguments$2 = supportsStandardArguments ? isStandardArguments : isLegacyArguments;
+           _export({
+             global: true, forced: TypedArrayConstructor != NativeTypedArrayConstructor, sham: !NATIVE_ARRAY_BUFFER_VIEWS
+           }, exported);
 
-       var toString = {}.toString;
+           if (!(BYTES_PER_ELEMENT in TypedArrayConstructor)) {
+             createNonEnumerableProperty(TypedArrayConstructor, BYTES_PER_ELEMENT, BYTES);
+           }
 
-       var isarray = Array.isArray || function (arr) {
-         return toString.call(arr) == '[object Array]';
-       };
+           if (!(BYTES_PER_ELEMENT in TypedArrayConstructorPrototype)) {
+             createNonEnumerableProperty(TypedArrayConstructorPrototype, BYTES_PER_ELEMENT, BYTES);
+           }
 
-       var strValue = String.prototype.valueOf;
-       var tryStringObject = function tryStringObject(value) {
-               try {
-                       strValue.call(value);
-                       return true;
-               } catch (e) {
-                       return false;
-               }
-       };
-       var toStr$a = Object.prototype.toString;
-       var strClass = '[object String]';
-       var hasToStringTag$4 = typeof Symbol === 'function' && typeof Symbol.toStringTag === 'symbol';
-
-       var isString$2 = function isString(value) {
-               if (typeof value === 'string') {
-                       return true;
-               }
-               if (typeof value !== 'object') {
-                       return false;
-               }
-               return hasToStringTag$4 ? tryStringObject(value) : toStr$a.call(value) === strClass;
-       };
+           setSpecies(CONSTRUCTOR_NAME);
+         };
+       } else module.exports = function () { /* empty */ };
+       });
 
-       var $Map = typeof Map === 'function' && Map.prototype ? Map : null;
-       var $Set = typeof Set === 'function' && Set.prototype ? Set : null;
-
-       var exported;
-
-       if (!$Map) {
-               // eslint-disable-next-line no-unused-vars
-               exported = function isMap(x) {
-                       // `Map` is not present in this environment.
-                       return false;
-               };
-       }
-
-       var $mapHas = $Map ? Map.prototype.has : null;
-       var $setHas = $Set ? Set.prototype.has : null;
-       if (!exported && !$mapHas) {
-               // eslint-disable-next-line no-unused-vars
-               exported = function isMap(x) {
-                       // `Map` does not have a `has` method
-                       return false;
-               };
-       }
-
-       var isMap$1 = exported || function isMap(x) {
-               if (!x || typeof x !== 'object') {
-                       return false;
-               }
-               try {
-                       $mapHas.call(x);
-                       if ($setHas) {
-                               try {
-                                       $setHas.call(x);
-                               } catch (e) {
-                                       return true;
-                               }
-                       }
-                       return x instanceof $Map; // core-js workaround, pre-v2.5.0
-               } catch (e) {}
-               return false;
-       };
+       // `Uint8Array` constructor
+       // https://tc39.github.io/ecma262/#sec-typedarray-objects
+       typedArrayConstructor('Uint8', function (init) {
+         return function Uint8Array(data, byteOffset, length) {
+           return init(this, data, byteOffset, length);
+         };
+       });
 
-       var $Map$1 = typeof Map === 'function' && Map.prototype ? Map : null;
-       var $Set$1 = typeof Set === 'function' && Set.prototype ? Set : null;
-
-       var exported$1;
-
-       if (!$Set$1) {
-               // eslint-disable-next-line no-unused-vars
-               exported$1 = function isSet(x) {
-                       // `Set` is not present in this environment.
-                       return false;
-               };
-       }
-
-       var $mapHas$1 = $Map$1 ? Map.prototype.has : null;
-       var $setHas$1 = $Set$1 ? Set.prototype.has : null;
-       if (!exported$1 && !$setHas$1) {
-               // eslint-disable-next-line no-unused-vars
-               exported$1 = function isSet(x) {
-                       // `Set` does not have a `has` method
-                       return false;
-               };
-       }
-
-       var isSet$1 = exported$1 || function isSet(x) {
-               if (!x || typeof x !== 'object') {
-                       return false;
-               }
-               try {
-                       $setHas$1.call(x);
-                       if ($mapHas$1) {
-                               try {
-                                       $mapHas$1.call(x);
-                               } catch (e) {
-                                       return true;
-                               }
-                       }
-                       return x instanceof $Set$1; // core-js workaround, pre-v2.5.0
-               } catch (e) {}
-               return false;
-       };
+       var min$4 = Math.min;
+
+       // `Array.prototype.copyWithin` method implementation
+       // https://tc39.github.io/ecma262/#sec-array.prototype.copywithin
+       var arrayCopyWithin = [].copyWithin || function copyWithin(target /* = 0 */, start /* = 0, end = @length */) {
+         var O = toObject(this);
+         var len = toLength(O.length);
+         var to = toAbsoluteIndex(target, len);
+         var from = toAbsoluteIndex(start, len);
+         var end = arguments.length > 2 ? arguments[2] : undefined;
+         var count = min$4((end === undefined ? len : toAbsoluteIndex(end, len)) - from, len - to);
+         var inc = 1;
+         if (from < to && to < from + count) {
+           inc = -1;
+           from += count - 1;
+           to += count - 1;
+         }
+         while (count-- > 0) {
+           if (from in O) O[to] = O[from];
+           else delete O[to];
+           to += inc;
+           from += inc;
+         } return O;
+       };
+
+       var aTypedArray$1 = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$1 = arrayBufferViewCore.exportTypedArrayMethod;
+
+       // `%TypedArray%.prototype.copyWithin` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.copywithin
+       exportTypedArrayMethod$1('copyWithin', function copyWithin(target, start /* , end */) {
+         return arrayCopyWithin.call(aTypedArray$1(this), target, start, arguments.length > 2 ? arguments[2] : undefined);
+       });
 
-       var esGetIterator = createCommonjsModule(function (module) {
+       var $every = arrayIteration.every;
 
-       /* eslint global-require: 0 */
-       // the code is structured this way so that bundlers can
-       // alias out `has-symbols` to `() => true` or `() => false` if your target
-       // environments' Symbol capabilities are known, and then use
-       // dead code elimination on the rest of this module.
-       //
-       // Similarly, `isarray` can be aliased to `Array.isArray` if
-       // available in all target environments.
-
-
-
-       if (hasSymbols$1() || shams()) {
-               var $iterator = Symbol.iterator;
-               // Symbol is available natively or shammed
-               // natively:
-               //  - Chrome >= 38
-               //  - Edge 12-14?, Edge >= 15 for sure
-               //  - FF >= 36
-               //  - Safari >= 9
-               //  - node >= 0.12
-               module.exports = function getIterator(iterable) {
-                       // alternatively, `iterable[$iterator]?.()`
-                       if (iterable != null && typeof iterable[$iterator] !== 'undefined') {
-                               return iterable[$iterator]();
-                       }
-                       if (isArguments$2(iterable)) {
-                               // arguments objects lack Symbol.iterator
-                               // - node 0.12
-                               return Array.prototype[$iterator].call(iterable);
-                       }
-               };
-       } else {
-               // Symbol is not available, native or shammed
-               var isArray = isarray;
-               var isString = isString$2;
-               var GetIntrinsic$1 = GetIntrinsic;
-               var $Map = GetIntrinsic$1('%Map%', true);
-               var $Set = GetIntrinsic$1('%Set%', true);
-               var callBound$1 = callBound;
-               var $arrayPush = callBound$1('Array.prototype.push');
-               var $charCodeAt = callBound$1('String.prototype.charCodeAt');
-               var $stringSlice = callBound$1('String.prototype.slice');
-
-               var advanceStringIndex = function advanceStringIndex(S, index) {
-                       var length = S.length;
-                       if ((index + 1) >= length) {
-                               return index + 1;
-                       }
+       var aTypedArray$2 = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$2 = arrayBufferViewCore.exportTypedArrayMethod;
 
-                       var first = $charCodeAt(S, index);
-                       if (first < 0xD800 || first > 0xDBFF) {
-                               return index + 1;
-                       }
+       // `%TypedArray%.prototype.every` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.every
+       exportTypedArrayMethod$2('every', function every(callbackfn /* , thisArg */) {
+         return $every(aTypedArray$2(this), callbackfn, arguments.length > 1 ? arguments[1] : undefined);
+       });
 
-                       var second = $charCodeAt(S, index + 1);
-                       if (second < 0xDC00 || second > 0xDFFF) {
-                               return index + 1;
-                       }
+       var aTypedArray$3 = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$3 = arrayBufferViewCore.exportTypedArrayMethod;
 
-                       return index + 2;
-               };
-
-               var getArrayIterator = function getArrayIterator(arraylike) {
-                       var i = 0;
-                       return {
-                               next: function next() {
-                                       var done = i >= arraylike.length;
-                                       var value;
-                                       if (!done) {
-                                               value = arraylike[i];
-                                               i += 1;
-                                       }
-                                       return {
-                                               done: done,
-                                               value: value
-                                       };
-                               }
-                       };
-               };
-
-               var getNonCollectionIterator = function getNonCollectionIterator(iterable) {
-                       if (isArray(iterable) || isArguments$2(iterable)) {
-                               return getArrayIterator(iterable);
-                       }
-                       if (isString(iterable)) {
-                               var i = 0;
-                               return {
-                                       next: function next() {
-                                               var nextIndex = advanceStringIndex(iterable, i);
-                                               var value = $stringSlice(iterable, i, nextIndex);
-                                               i = nextIndex;
-                                               return {
-                                                       done: nextIndex > iterable.length,
-                                                       value: value
-                                               };
-                                       }
-                               };
-                       }
-               };
-
-               if (!$Map && !$Set) {
-                       // the only language iterables are Array, String, arguments
-                       // - Safari <= 6.0
-                       // - Chrome < 38
-                       // - node < 0.12
-                       // - FF < 13
-                       // - IE < 11
-                       // - Edge < 11
-
-                       module.exports = getNonCollectionIterator;
-               } else {
-                       // either Map or Set are available, but Symbol is not
-                       // - es6-shim on an ES5 browser
-                       // - Safari 6.2 (maybe 6.1?)
-                       // - FF v[13, 36)
-                       // - IE 11
-                       // - Edge 11
-                       // - Safari v[6, 9)
-
-                       var isMap = isMap$1;
-                       var isSet = isSet$1;
-
-                       // Firefox >= 27, IE 11, Safari 6.2 - 9, Edge 11, es6-shim in older envs, all have forEach
-                       var $mapForEach = callBound$1('Map.prototype.forEach', true);
-                       var $setForEach = callBound$1('Set.prototype.forEach', true);
-                       if (typeof process === 'undefined' || !process.versions || !process.versions.node) { // "if is not node"
-
-                               // Firefox 17 - 26 has `.iterator()`, whose iterator `.next()` either
-                               // returns a value, or throws a StopIteration object. These browsers
-                               // do not have any other mechanism for iteration.
-                               var $mapIterator = callBound$1('Map.prototype.iterator', true);
-                               var $setIterator = callBound$1('Set.prototype.iterator', true);
-                               var getStopIterationIterator = function (iterator) {
-                                       var done = false;
-                                       return {
-                                               next: function next() {
-                                                       try {
-                                                               return {
-                                                                       done: done,
-                                                                       value: done ? undefined : iterator.next()
-                                                               };
-                                                       } catch (e) {
-                                                               done = true;
-                                                               return {
-                                                                       done: true,
-                                                                       value: undefined
-                                                               };
-                                                       }
-                                               }
-                                       };
-                               };
-                       }
-                       // Firefox 27-35, and some older es6-shim versions, use a string "@@iterator" property
-                       // this returns a proper iterator object, so we should use it instead of forEach.
-                       // newer es6-shim versions use a string "_es6-shim iterator_" property.
-                       var $mapAtAtIterator = callBound$1('Map.prototype.@@iterator', true) || callBound$1('Map.prototype._es6-shim iterator_', true);
-                       var $setAtAtIterator = callBound$1('Set.prototype.@@iterator', true) || callBound$1('Set.prototype._es6-shim iterator_', true);
-
-                       var getCollectionIterator = function getCollectionIterator(iterable) {
-                               if (isMap(iterable)) {
-                                       if ($mapIterator) {
-                                               return getStopIterationIterator($mapIterator(iterable));
-                                       }
-                                       if ($mapAtAtIterator) {
-                                               return $mapAtAtIterator(iterable);
-                                       }
-                                       if ($mapForEach) {
-                                               var entries = [];
-                                               $mapForEach(iterable, function (v, k) {
-                                                       $arrayPush(entries, [k, v]);
-                                               });
-                                               return getArrayIterator(entries);
-                                       }
-                               }
-                               if (isSet(iterable)) {
-                                       if ($setIterator) {
-                                               return getStopIterationIterator($setIterator(iterable));
-                                       }
-                                       if ($setAtAtIterator) {
-                                               return $setAtAtIterator(iterable);
-                                       }
-                                       if ($setForEach) {
-                                               var values = [];
-                                               $setForEach(iterable, function (v) {
-                                                       $arrayPush(values, v);
-                                               });
-                                               return getArrayIterator(values);
-                                       }
-                               }
-                       };
-
-                       module.exports = function getIterator(iterable) {
-                               return getCollectionIterator(iterable) || getNonCollectionIterator(iterable);
-                       };
-               }
-       }
+       // `%TypedArray%.prototype.fill` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.fill
+       // eslint-disable-next-line no-unused-vars
+       exportTypedArrayMethod$3('fill', function fill(value /* , start, end */) {
+         return arrayFill.apply(aTypedArray$3(this), arguments);
        });
 
-       var $TypeError$c = TypeError;
-
-       // eslint-disable-next-line consistent-return
-       var iterateIterator = function iterateIterator(iterator) {
-               if (!iterator || typeof iterator.next !== 'function') {
-                       throw new $TypeError$c('iterator must be an object with a `next` method');
-               }
-               if (arguments.length > 1) {
-                       var callback = arguments[1];
-                       if (typeof callback !== 'function') {
-                               throw new $TypeError$c('`callback`, if provided, must be a function');
-                       }
-               }
-               var values = callback || [];
-               var result;
-               while ((result = iterator.next()) && !result.done) {
-                       if (callback) {
-                               callback(result.value); // eslint-disable-line callback-return
-                       } else {
-                               values.push(result.value);
-                       }
-               }
-               if (!callback) {
-                       return values;
-               }
-       };
+       var $filter = arrayIteration.filter;
 
-       var $TypeError$d = TypeError;
 
+       var aTypedArray$4 = arrayBufferViewCore.aTypedArray;
+       var aTypedArrayConstructor$2 = arrayBufferViewCore.aTypedArrayConstructor;
+       var exportTypedArrayMethod$4 = arrayBufferViewCore.exportTypedArrayMethod;
 
-       var iterateValue = function iterateValue(iterable) {
-               var iterator = esGetIterator(iterable);
-               if (!iterator) {
-                       throw new $TypeError$d('non-iterable value provided');
-               }
-               if (arguments.length > 1) {
-                       return iterateIterator(iterator, arguments[1]);
-               }
-               return iterateIterator(iterator);
-       };
+       // `%TypedArray%.prototype.filter` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.filter
+       exportTypedArrayMethod$4('filter', function filter(callbackfn /* , thisArg */) {
+         var list = $filter(aTypedArray$4(this), callbackfn, arguments.length > 1 ? arguments[1] : undefined);
+         var C = speciesConstructor(this, this.constructor);
+         var index = 0;
+         var length = list.length;
+         var result = new (aTypedArrayConstructor$2(C))(length);
+         while (length > index) result[index] = list[index++];
+         return result;
+       });
 
-       var implementation$5 = function from(items) {
-               var C = this;
-               if (items === null || typeof items === 'undefined') {
-                       throw new TypeError('`Array.from` requires an array-like object, not `null` or `undefined`');
-               }
-               var mapFn, T;
-               if (typeof arguments[1] !== 'undefined') {
-                       mapFn = arguments[1];
-                       if (!IsCallable(mapFn)) {
-                               throw new TypeError('When provided, the second argument to `Array.from` must be a function');
-                       }
-                       if (arguments.length > 2) {
-                               T = arguments[2];
-                       }
-               }
-
-               var values;
-               try {
-                       values = iterateValue(items);
-               } catch (e) {
-                       values = items;
-               }
-
-               var arrayLike = ToObject(values);
-               var len = ToLength(arrayLike.length);
-               var A = IsConstructor(C) ? ToObject(new C(len)) : new Array(len);
-               var k = 0;
-               var kValue, mappedValue;
-
-               while (k < len) {
-                       var Pk = ToString(k);
-                       kValue = Get(arrayLike, Pk);
-                       if (mapFn) {
-                               mappedValue = typeof T === 'undefined' ? mapFn(kValue, k) : Call(mapFn, T, [kValue, k]);
-                       } else {
-                               mappedValue = kValue;
-                       }
-                       CreateDataPropertyOrThrow(A, Pk, mappedValue);
-                       k += 1;
-               }
-               A.length = len;
-               return A;
-       };
+       var $find = arrayIteration.find;
 
-       var tryCall = function (fn) {
-               try {
-                       return fn();
-               } catch (e) {
-                       return false;
-               }
-       };
+       var aTypedArray$5 = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$5 = arrayBufferViewCore.exportTypedArrayMethod;
 
-       var polyfill$8 = function getPolyfill() {
-               if (IsCallable(Array.from)) {
-                       var handlesUndefMapper = tryCall(function () {
-                               // Microsoft Edge v0.11 throws if the mapFn argument is *provided* but undefined,
-                               // but the spec doesn't care if it's provided or not - undefined doesn't throw.
-                               return Array.from([0], undefined);
-                       });
-                       if (!handlesUndefMapper) {
-                               var origArrayFrom = Array.from;
-                               return function from(items) {
-                                       /* eslint no-invalid-this: 0 */
-                                       if (arguments.length > 1 && typeof arguments[1] !== 'undefined') {
-                                               return Call(origArrayFrom, this, arguments);
-                                       } else {
-                                               return Call(origArrayFrom, this, [items]);
-                                       }
-                               };
-                       }
-                       var implemented = tryCall(function () {
-                               // Detects a Firefox bug in v32
-                               // https://bugzilla.mozilla.org/show_bug.cgi?id=1063993
-                               return Array.from({ 'length': -1 }) === 0;
-                       })
-                       && tryCall(function () {
-                               // Detects a bug in Webkit nightly r181886
-                               var arr = Array.from([0].entries());
-                               return arr.length === 1 && IsArray(arr[0]) && arr[0][0] === 0 && arr[0][1] === 0;
-                       })
-                       && tryCall(function () {
-                               return Array.from({ 'length': -Infinity });
-                       });
-                       if (implemented) {
-                               return Array.from;
-                       }
-               }
+       // `%TypedArray%.prototype.find` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.find
+       exportTypedArrayMethod$5('find', function find(predicate /* , thisArg */) {
+         return $find(aTypedArray$5(this), predicate, arguments.length > 1 ? arguments[1] : undefined);
+       });
 
-               return implementation$5;
-       };
+       var $findIndex = arrayIteration.findIndex;
 
-       var shim$a = function shimArrayFrom() {
-               var polyfill = polyfill$8();
+       var aTypedArray$6 = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$6 = arrayBufferViewCore.exportTypedArrayMethod;
 
-               defineProperties_1(Array, { 'from': polyfill }, {
-                       'from': function () {
-                               return Array.from !== polyfill;
-                       }
-               });
+       // `%TypedArray%.prototype.findIndex` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.findindex
+       exportTypedArrayMethod$6('findIndex', function findIndex(predicate /* , thisArg */) {
+         return $findIndex(aTypedArray$6(this), predicate, arguments.length > 1 ? arguments[1] : undefined);
+       });
 
-               return polyfill;
-       };
+       var $forEach$2 = arrayIteration.forEach;
 
-       var polyfill$9 = polyfill$8();
+       var aTypedArray$7 = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$7 = arrayBufferViewCore.exportTypedArrayMethod;
 
-       // eslint-disable-next-line no-unused-vars
-       var boundFromShim = function from(items) {
-               // eslint-disable-next-line no-invalid-this
-               return polyfill$9.apply(this || Array, arguments);
-       };
+       // `%TypedArray%.prototype.forEach` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.foreach
+       exportTypedArrayMethod$7('forEach', function forEach(callbackfn /* , thisArg */) {
+         $forEach$2(aTypedArray$7(this), callbackfn, arguments.length > 1 ? arguments[1] : undefined);
+       });
+
+       var $includes = arrayIncludes.includes;
 
-       defineProperties_1(boundFromShim, {
-               'getPolyfill': polyfill$8,
-               'implementation': implementation$5,
-               'shim': shim$a
+       var aTypedArray$8 = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$8 = arrayBufferViewCore.exportTypedArrayMethod;
+
+       // `%TypedArray%.prototype.includes` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.includes
+       exportTypedArrayMethod$8('includes', function includes(searchElement /* , fromIndex */) {
+         return $includes(aTypedArray$8(this), searchElement, arguments.length > 1 ? arguments[1] : undefined);
        });
 
-       var array_from = boundFromShim;
+       var $indexOf$1 = arrayIncludes.indexOf;
 
-       var $isEnumerable$2 = callBound('Object.prototype.propertyIsEnumerable');
+       var aTypedArray$9 = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$9 = arrayBufferViewCore.exportTypedArrayMethod;
 
-       var implementation$6 = function values(O) {
-               var obj = RequireObjectCoercible(O);
-               var vals = [];
-               for (var key in obj) {
-                       if (src(obj, key) && $isEnumerable$2(obj, key)) {
-                               vals.push(obj[key]);
-                       }
-               }
-               return vals;
-       };
+       // `%TypedArray%.prototype.indexOf` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.indexof
+       exportTypedArrayMethod$9('indexOf', function indexOf(searchElement /* , fromIndex */) {
+         return $indexOf$1(aTypedArray$9(this), searchElement, arguments.length > 1 ? arguments[1] : undefined);
+       });
 
-       var polyfill$a = function getPolyfill() {
-               return typeof Object.values === 'function' ? Object.values : implementation$6;
-       };
+       var ITERATOR$5 = wellKnownSymbol('iterator');
+       var Uint8Array$1 = global_1.Uint8Array;
+       var arrayValues = es_array_iterator.values;
+       var arrayKeys = es_array_iterator.keys;
+       var arrayEntries = es_array_iterator.entries;
+       var aTypedArray$a = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$a = arrayBufferViewCore.exportTypedArrayMethod;
+       var nativeTypedArrayIterator = Uint8Array$1 && Uint8Array$1.prototype[ITERATOR$5];
 
-       var shim$b = function shimValues() {
-               var polyfill = polyfill$a();
-               defineProperties_1(Object, { values: polyfill }, {
-                       values: function testValues() {
-                               return Object.values !== polyfill;
-                       }
-               });
-               return polyfill;
+       var CORRECT_ITER_NAME = !!nativeTypedArrayIterator
+         && (nativeTypedArrayIterator.name == 'values' || nativeTypedArrayIterator.name == undefined);
+
+       var typedArrayValues = function values() {
+         return arrayValues.call(aTypedArray$a(this));
        };
 
-       var polyfill$b = polyfill$a();
+       // `%TypedArray%.prototype.entries` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.entries
+       exportTypedArrayMethod$a('entries', function entries() {
+         return arrayEntries.call(aTypedArray$a(this));
+       });
+       // `%TypedArray%.prototype.keys` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.keys
+       exportTypedArrayMethod$a('keys', function keys() {
+         return arrayKeys.call(aTypedArray$a(this));
+       });
+       // `%TypedArray%.prototype.values` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.values
+       exportTypedArrayMethod$a('values', typedArrayValues, !CORRECT_ITER_NAME);
+       // `%TypedArray%.prototype[@@iterator]` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype-@@iterator
+       exportTypedArrayMethod$a(ITERATOR$5, typedArrayValues, !CORRECT_ITER_NAME);
+
+       var aTypedArray$b = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$b = arrayBufferViewCore.exportTypedArrayMethod;
+       var $join = [].join;
+
+       // `%TypedArray%.prototype.join` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.join
+       // eslint-disable-next-line no-unused-vars
+       exportTypedArrayMethod$b('join', function join(separator) {
+         return $join.apply(aTypedArray$b(this), arguments);
+       });
+
+       var min$5 = Math.min;
+       var nativeLastIndexOf = [].lastIndexOf;
+       var NEGATIVE_ZERO$1 = !!nativeLastIndexOf && 1 / [1].lastIndexOf(1, -0) < 0;
+       var STRICT_METHOD$3 = arrayMethodIsStrict('lastIndexOf');
+       // For preventing possible almost infinite loop in non-standard implementations, test the forward version of the method
+       var USES_TO_LENGTH$4 = arrayMethodUsesToLength('indexOf', { ACCESSORS: true, 1: 0 });
+       var FORCED$1 = NEGATIVE_ZERO$1 || !STRICT_METHOD$3 || !USES_TO_LENGTH$4;
+
+       // `Array.prototype.lastIndexOf` method implementation
+       // https://tc39.github.io/ecma262/#sec-array.prototype.lastindexof
+       var arrayLastIndexOf = FORCED$1 ? function lastIndexOf(searchElement /* , fromIndex = @[*-1] */) {
+         // convert -0 to +0
+         if (NEGATIVE_ZERO$1) return nativeLastIndexOf.apply(this, arguments) || 0;
+         var O = toIndexedObject(this);
+         var length = toLength(O.length);
+         var index = length - 1;
+         if (arguments.length > 1) index = min$5(index, toInteger(arguments[1]));
+         if (index < 0) index = length + index;
+         for (;index >= 0; index--) if (index in O && O[index] === searchElement) return index || 0;
+         return -1;
+       } : nativeLastIndexOf;
+
+       var aTypedArray$c = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$c = arrayBufferViewCore.exportTypedArrayMethod;
 
-       defineProperties_1(polyfill$b, {
-               getPolyfill: polyfill$a,
-               implementation: implementation$6,
-               shim: shim$b
+       // `%TypedArray%.prototype.lastIndexOf` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.lastindexof
+       // eslint-disable-next-line no-unused-vars
+       exportTypedArrayMethod$c('lastIndexOf', function lastIndexOf(searchElement /* , fromIndex */) {
+         return arrayLastIndexOf.apply(aTypedArray$c(this), arguments);
        });
 
-       var object_values = polyfill$b;
+       var $map$1 = arrayIteration.map;
 
-       // modified from https://github.com/es-shims/es6-shim
 
+       var aTypedArray$d = arrayBufferViewCore.aTypedArray;
+       var aTypedArrayConstructor$3 = arrayBufferViewCore.aTypedArrayConstructor;
+       var exportTypedArrayMethod$d = arrayBufferViewCore.exportTypedArrayMethod;
 
-       var canBeObject = function (obj) {
-               return typeof obj !== 'undefined' && obj !== null;
-       };
-       var hasSymbols$5 = shams();
-       var toObject = Object;
-       var push = functionBind.call(Function.call, Array.prototype.push);
-       var propIsEnumerable = functionBind.call(Function.call, Object.prototype.propertyIsEnumerable);
-       var originalGetSymbols = hasSymbols$5 ? Object.getOwnPropertySymbols : null;
-
-       var implementation$7 = function assign(target, source1) {
-               if (!canBeObject(target)) { throw new TypeError('target must be an object'); }
-               var objTarget = toObject(target);
-               var s, source, i, props, syms, value, key;
-               for (s = 1; s < arguments.length; ++s) {
-                       source = toObject(arguments[s]);
-                       props = objectKeys(source);
-                       var getSymbols = hasSymbols$5 && (Object.getOwnPropertySymbols || originalGetSymbols);
-                       if (getSymbols) {
-                               syms = getSymbols(source);
-                               for (i = 0; i < syms.length; ++i) {
-                                       key = syms[i];
-                                       if (propIsEnumerable(source, key)) {
-                                               push(props, key);
-                                       }
-                               }
-                       }
-                       for (i = 0; i < props.length; ++i) {
-                               key = props[i];
-                               value = source[key];
-                               if (propIsEnumerable(source, key)) {
-                                       objTarget[key] = value;
-                               }
-                       }
-               }
-               return objTarget;
-       };
+       // `%TypedArray%.prototype.map` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.map
+       exportTypedArrayMethod$d('map', function map(mapfn /* , thisArg */) {
+         return $map$1(aTypedArray$d(this), mapfn, arguments.length > 1 ? arguments[1] : undefined, function (O, length) {
+           return new (aTypedArrayConstructor$3(speciesConstructor(O, O.constructor)))(length);
+         });
+       });
 
-       var lacksProperEnumerationOrder = function () {
-               if (!Object.assign) {
-                       return false;
-               }
-               // v8, specifically in node 4.x, has a bug with incorrect property enumeration order
-               // note: this does not detect the bug unless there's 20 characters
-               var str = 'abcdefghijklmnopqrst';
-               var letters = str.split('');
-               var map = {};
-               for (var i = 0; i < letters.length; ++i) {
-                       map[letters[i]] = letters[i];
-               }
-               var obj = Object.assign({}, map);
-               var actual = '';
-               for (var k in obj) {
-                       actual += k;
-               }
-               return str !== actual;
+       // `Array.prototype.{ reduce, reduceRight }` methods implementation
+       var createMethod$4 = function (IS_RIGHT) {
+         return function (that, callbackfn, argumentsLength, memo) {
+           aFunction$1(callbackfn);
+           var O = toObject(that);
+           var self = indexedObject(O);
+           var length = toLength(O.length);
+           var index = IS_RIGHT ? length - 1 : 0;
+           var i = IS_RIGHT ? -1 : 1;
+           if (argumentsLength < 2) while (true) {
+             if (index in self) {
+               memo = self[index];
+               index += i;
+               break;
+             }
+             index += i;
+             if (IS_RIGHT ? index < 0 : length <= index) {
+               throw TypeError('Reduce of empty array with no initial value');
+             }
+           }
+           for (;IS_RIGHT ? index >= 0 : length > index; index += i) if (index in self) {
+             memo = callbackfn(memo, self[index], index, O);
+           }
+           return memo;
+         };
        };
 
-       var assignHasPendingExceptions = function () {
-               if (!Object.assign || !Object.preventExtensions) {
-                       return false;
-               }
-               // Firefox 37 still has "pending exception" logic in its Object.assign implementation,
-               // which is 72% slower than our shim, and Firefox 40's native implementation.
-               var thrower = Object.preventExtensions({ 1: 2 });
-               try {
-                       Object.assign(thrower, 'xy');
-               } catch (e) {
-                       return thrower[1] === 'y';
-               }
-               return false;
+       var arrayReduce = {
+         // `Array.prototype.reduce` method
+         // https://tc39.github.io/ecma262/#sec-array.prototype.reduce
+         left: createMethod$4(false),
+         // `Array.prototype.reduceRight` method
+         // https://tc39.github.io/ecma262/#sec-array.prototype.reduceright
+         right: createMethod$4(true)
        };
 
-       var polyfill$c = function getPolyfill() {
-               if (!Object.assign) {
-                       return implementation$7;
-               }
-               if (lacksProperEnumerationOrder()) {
-                       return implementation$7;
-               }
-               if (assignHasPendingExceptions()) {
-                       return implementation$7;
-               }
-               return Object.assign;
-       };
+       var $reduce = arrayReduce.left;
 
-       var shim$c = function shimAssign() {
-               var polyfill = polyfill$c();
-               defineProperties_1(
-                       Object,
-                       { assign: polyfill },
-                       { assign: function () { return Object.assign !== polyfill; } }
-               );
-               return polyfill;
-       };
+       var aTypedArray$e = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$e = arrayBufferViewCore.exportTypedArrayMethod;
+
+       // `%TypedArray%.prototype.reduce` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.reduce
+       exportTypedArrayMethod$e('reduce', function reduce(callbackfn /* , initialValue */) {
+         return $reduce(aTypedArray$e(this), callbackfn, arguments.length, arguments.length > 1 ? arguments[1] : undefined);
+       });
+
+       var $reduceRight = arrayReduce.right;
 
-       var polyfill$d = polyfill$c();
+       var aTypedArray$f = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$f = arrayBufferViewCore.exportTypedArrayMethod;
 
-       defineProperties_1(polyfill$d, {
-               getPolyfill: polyfill$c,
-               implementation: implementation$7,
-               shim: shim$c
+       // `%TypedArray%.prototype.reduceRicht` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.reduceright
+       exportTypedArrayMethod$f('reduceRight', function reduceRight(callbackfn /* , initialValue */) {
+         return $reduceRight(aTypedArray$f(this), callbackfn, arguments.length, arguments.length > 1 ? arguments[1] : undefined);
        });
 
-       var object_assign = polyfill$d;
+       var aTypedArray$g = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$g = arrayBufferViewCore.exportTypedArrayMethod;
+       var floor$3 = Math.floor;
 
-       /**
-        * @this {Promise}
-        */
-       function finallyConstructor(callback) {
-         var constructor = this.constructor;
-         return this.then(
-           function(value) {
-             // @ts-ignore
-             return constructor.resolve(callback()).then(function() {
-               return value;
-             });
-           },
-           function(reason) {
-             // @ts-ignore
-             return constructor.resolve(callback()).then(function() {
-               // @ts-ignore
-               return constructor.reject(reason);
-             });
-           }
+       // `%TypedArray%.prototype.reverse` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.reverse
+       exportTypedArrayMethod$g('reverse', function reverse() {
+         var that = this;
+         var length = aTypedArray$g(that).length;
+         var middle = floor$3(length / 2);
+         var index = 0;
+         var value;
+         while (index < middle) {
+           value = that[index];
+           that[index++] = that[--length];
+           that[length] = value;
+         } return that;
+       });
+
+       var aTypedArray$h = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$h = arrayBufferViewCore.exportTypedArrayMethod;
+
+       var FORCED$2 = fails(function () {
+         // eslint-disable-next-line no-undef
+         new Int8Array(1).set({});
+       });
+
+       // `%TypedArray%.prototype.set` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.set
+       exportTypedArrayMethod$h('set', function set(arrayLike /* , offset */) {
+         aTypedArray$h(this);
+         var offset = toOffset(arguments.length > 1 ? arguments[1] : undefined, 1);
+         var length = this.length;
+         var src = toObject(arrayLike);
+         var len = toLength(src.length);
+         var index = 0;
+         if (len + offset > length) throw RangeError('Wrong length');
+         while (index < len) this[offset + index] = src[index++];
+       }, FORCED$2);
+
+       var aTypedArray$i = arrayBufferViewCore.aTypedArray;
+       var aTypedArrayConstructor$4 = arrayBufferViewCore.aTypedArrayConstructor;
+       var exportTypedArrayMethod$i = arrayBufferViewCore.exportTypedArrayMethod;
+       var $slice = [].slice;
+
+       var FORCED$3 = fails(function () {
+         // eslint-disable-next-line no-undef
+         new Int8Array(1).slice();
+       });
+
+       // `%TypedArray%.prototype.slice` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.slice
+       exportTypedArrayMethod$i('slice', function slice(start, end) {
+         var list = $slice.call(aTypedArray$i(this), start, end);
+         var C = speciesConstructor(this, this.constructor);
+         var index = 0;
+         var length = list.length;
+         var result = new (aTypedArrayConstructor$4(C))(length);
+         while (length > index) result[index] = list[index++];
+         return result;
+       }, FORCED$3);
+
+       var $some = arrayIteration.some;
+
+       var aTypedArray$j = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$j = arrayBufferViewCore.exportTypedArrayMethod;
+
+       // `%TypedArray%.prototype.some` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.some
+       exportTypedArrayMethod$j('some', function some(callbackfn /* , thisArg */) {
+         return $some(aTypedArray$j(this), callbackfn, arguments.length > 1 ? arguments[1] : undefined);
+       });
+
+       var aTypedArray$k = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$k = arrayBufferViewCore.exportTypedArrayMethod;
+       var $sort = [].sort;
+
+       // `%TypedArray%.prototype.sort` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.sort
+       exportTypedArrayMethod$k('sort', function sort(comparefn) {
+         return $sort.call(aTypedArray$k(this), comparefn);
+       });
+
+       var aTypedArray$l = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$l = arrayBufferViewCore.exportTypedArrayMethod;
+
+       // `%TypedArray%.prototype.subarray` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.subarray
+       exportTypedArrayMethod$l('subarray', function subarray(begin, end) {
+         var O = aTypedArray$l(this);
+         var length = O.length;
+         var beginIndex = toAbsoluteIndex(begin, length);
+         return new (speciesConstructor(O, O.constructor))(
+           O.buffer,
+           O.byteOffset + beginIndex * O.BYTES_PER_ELEMENT,
+           toLength((end === undefined ? length : toAbsoluteIndex(end, length)) - beginIndex)
          );
-       }
+       });
 
-       // Store setTimeout reference so promise-polyfill will be unaffected by
-       // other code modifying setTimeout (like sinon.useFakeTimers())
-       var setTimeoutFunc = setTimeout;
+       var Int8Array$3 = global_1.Int8Array;
+       var aTypedArray$m = arrayBufferViewCore.aTypedArray;
+       var exportTypedArrayMethod$m = arrayBufferViewCore.exportTypedArrayMethod;
+       var $toLocaleString = [].toLocaleString;
+       var $slice$1 = [].slice;
 
-       function isArray$4(x) {
-         return Boolean(x && typeof x.length !== 'undefined');
-       }
+       // iOS Safari 6.x fails here
+       var TO_LOCALE_STRING_BUG = !!Int8Array$3 && fails(function () {
+         $toLocaleString.call(new Int8Array$3(1));
+       });
 
-       function noop$1() {}
+       var FORCED$4 = fails(function () {
+         return [1, 2].toLocaleString() != new Int8Array$3([1, 2]).toLocaleString();
+       }) || !fails(function () {
+         Int8Array$3.prototype.toLocaleString.call([1, 2]);
+       });
 
-       // Polyfill for Function.prototype.bind
-       function bind$2(fn, thisArg) {
-         return function() {
-           fn.apply(thisArg, arguments);
-         };
-       }
+       // `%TypedArray%.prototype.toLocaleString` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.tolocalestring
+       exportTypedArrayMethod$m('toLocaleString', function toLocaleString() {
+         return $toLocaleString.apply(TO_LOCALE_STRING_BUG ? $slice$1.call(aTypedArray$m(this)) : aTypedArray$m(this), arguments);
+       }, FORCED$4);
+
+       var exportTypedArrayMethod$n = arrayBufferViewCore.exportTypedArrayMethod;
+
+
+
+       var Uint8Array$2 = global_1.Uint8Array;
+       var Uint8ArrayPrototype = Uint8Array$2 && Uint8Array$2.prototype || {};
+       var arrayToString = [].toString;
+       var arrayJoin = [].join;
+
+       if (fails(function () { arrayToString.call({}); })) {
+         arrayToString = function toString() {
+           return arrayJoin.call(this);
+         };
+       }
+
+       var IS_NOT_ARRAY_METHOD = Uint8ArrayPrototype.toString != arrayToString;
+
+       // `%TypedArray%.prototype.toString` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.tostring
+       exportTypedArrayMethod$n('toString', arrayToString, IS_NOT_ARRAY_METHOD);
+
+       // iterable DOM collections
+       // flag - `iterable` interface - 'entries', 'keys', 'values', 'forEach' methods
+       var domIterables = {
+         CSSRuleList: 0,
+         CSSStyleDeclaration: 0,
+         CSSValueList: 0,
+         ClientRectList: 0,
+         DOMRectList: 0,
+         DOMStringList: 0,
+         DOMTokenList: 1,
+         DataTransferItemList: 0,
+         FileList: 0,
+         HTMLAllCollection: 0,
+         HTMLCollection: 0,
+         HTMLFormElement: 0,
+         HTMLSelectElement: 0,
+         MediaList: 0,
+         MimeTypeArray: 0,
+         NamedNodeMap: 0,
+         NodeList: 1,
+         PaintRequestList: 0,
+         Plugin: 0,
+         PluginArray: 0,
+         SVGLengthList: 0,
+         SVGNumberList: 0,
+         SVGPathSegList: 0,
+         SVGPointList: 0,
+         SVGStringList: 0,
+         SVGTransformList: 0,
+         SourceBufferList: 0,
+         StyleSheetList: 0,
+         TextTrackCueList: 0,
+         TextTrackList: 0,
+         TouchList: 0
+       };
+
+       for (var COLLECTION_NAME in domIterables) {
+         var Collection = global_1[COLLECTION_NAME];
+         var CollectionPrototype = Collection && Collection.prototype;
+         // some Chrome versions have non-configurable methods on DOMTokenList
+         if (CollectionPrototype && CollectionPrototype.forEach !== arrayForEach) try {
+           createNonEnumerableProperty(CollectionPrototype, 'forEach', arrayForEach);
+         } catch (error) {
+           CollectionPrototype.forEach = arrayForEach;
+         }
+       }
+
+       var ITERATOR$6 = wellKnownSymbol('iterator');
+       var TO_STRING_TAG$4 = wellKnownSymbol('toStringTag');
+       var ArrayValues = es_array_iterator.values;
+
+       for (var COLLECTION_NAME$1 in domIterables) {
+         var Collection$1 = global_1[COLLECTION_NAME$1];
+         var CollectionPrototype$1 = Collection$1 && Collection$1.prototype;
+         if (CollectionPrototype$1) {
+           // some Chrome versions have non-configurable methods on DOMTokenList
+           if (CollectionPrototype$1[ITERATOR$6] !== ArrayValues) try {
+             createNonEnumerableProperty(CollectionPrototype$1, ITERATOR$6, ArrayValues);
+           } catch (error) {
+             CollectionPrototype$1[ITERATOR$6] = ArrayValues;
+           }
+           if (!CollectionPrototype$1[TO_STRING_TAG$4]) {
+             createNonEnumerableProperty(CollectionPrototype$1, TO_STRING_TAG$4, COLLECTION_NAME$1);
+           }
+           if (domIterables[COLLECTION_NAME$1]) for (var METHOD_NAME in es_array_iterator) {
+             // some Chrome versions have non-configurable methods on DOMTokenList
+             if (CollectionPrototype$1[METHOD_NAME] !== es_array_iterator[METHOD_NAME]) try {
+               createNonEnumerableProperty(CollectionPrototype$1, METHOD_NAME, es_array_iterator[METHOD_NAME]);
+             } catch (error) {
+               CollectionPrototype$1[METHOD_NAME] = es_array_iterator[METHOD_NAME];
+             }
+           }
+         }
+       }
+
+       var slice = [].slice;
+       var MSIE = /MSIE .\./.test(engineUserAgent); // <- dirty ie9- check
+
+       var wrap$1 = function (scheduler) {
+         return function (handler, timeout /* , ...arguments */) {
+           var boundArgs = arguments.length > 2;
+           var args = boundArgs ? slice.call(arguments, 2) : undefined;
+           return scheduler(boundArgs ? function () {
+             // eslint-disable-next-line no-new-func
+             (typeof handler == 'function' ? handler : Function(handler)).apply(this, args);
+           } : handler, timeout);
+         };
+       };
+
+       // ie9- setTimeout & setInterval additional parameters fix
+       // https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#timers
+       _export({ global: true, bind: true, forced: MSIE }, {
+         // `setTimeout` method
+         // https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#dom-settimeout
+         setTimeout: wrap$1(global_1.setTimeout),
+         // `setInterval` method
+         // https://html.spec.whatwg.org/multipage/timers-and-user-prompts.html#dom-setinterval
+         setInterval: wrap$1(global_1.setInterval)
+       });
 
-       /**
-        * @constructor
-        * @param {Function} fn
-        */
-       function Promise$1(fn) {
-         if (!(this instanceof Promise$1))
-           throw new TypeError('Promises must be constructed via new');
-         if (typeof fn !== 'function') throw new TypeError('not a function');
-         /** @type {!number} */
-         this._state = 0;
-         /** @type {!boolean} */
-         this._handled = false;
-         /** @type {Promise|undefined} */
-         this._value = undefined;
-         /** @type {!Array<!Function>} */
-         this._deferreds = [];
-
-         doResolve(fn, this);
-       }
-
-       function handle(self, deferred) {
-         while (self._state === 3) {
-           self = self._value;
-         }
-         if (self._state === 0) {
-           self._deferreds.push(deferred);
-           return;
-         }
-         self._handled = true;
-         Promise$1._immediateFn(function() {
-           var cb = self._state === 1 ? deferred.onFulfilled : deferred.onRejected;
-           if (cb === null) {
-             (self._state === 1 ? resolve : reject)(deferred.promise, self._value);
-             return;
-           }
-           var ret;
-           try {
-             ret = cb(self._value);
-           } catch (e) {
-             reject(deferred.promise, e);
-             return;
-           }
-           resolve(deferred.promise, ret);
+       var ITERATOR$7 = wellKnownSymbol('iterator');
+
+       var nativeUrl = !fails(function () {
+         var url = new URL('b?a=1&b=2&c=3', 'http://a');
+         var searchParams = url.searchParams;
+         var result = '';
+         url.pathname = 'c%20d';
+         searchParams.forEach(function (value, key) {
+           searchParams['delete']('b');
+           result += key + value;
          });
-       }
+         return (isPure && !url.toJSON)
+           || !searchParams.sort
+           || url.href !== 'http://a/c%20d?a=1&c=3'
+           || searchParams.get('c') !== '3'
+           || String(new URLSearchParams('?a=1')) !== 'a=1'
+           || !searchParams[ITERATOR$7]
+           // throws in Edge
+           || new URL('https://a@b').username !== 'a'
+           || new URLSearchParams(new URLSearchParams('a=b')).get('a') !== 'b'
+           // not punycoded in Edge
+           || new URL('http://тест').host !== 'xn--e1aybc'
+           // not escaped in Chrome 62-
+           || new URL('http://a#б').hash !== '#%D0%B1'
+           // fails in Chrome 66-
+           || result !== 'a1c3'
+           // throws in Safari
+           || new URL('http://x', undefined).host !== 'x';
+       });
 
-       function resolve(self, newValue) {
-         try {
-           // Promise Resolution Procedure: https://github.com/promises-aplus/promises-spec#the-promise-resolution-procedure
-           if (newValue === self)
-             throw new TypeError('A promise cannot be resolved with itself.');
-           if (
-             newValue &&
-             (typeof newValue === 'object' || typeof newValue === 'function')
-           ) {
-             var then = newValue.then;
-             if (newValue instanceof Promise$1) {
-               self._state = 3;
-               self._value = newValue;
-               finale(self);
-               return;
-             } else if (typeof then === 'function') {
-               doResolve(bind$2(then, newValue), self);
-               return;
-             }
+       var nativeAssign = Object.assign;
+       var defineProperty$7 = Object.defineProperty;
+
+       // `Object.assign` method
+       // https://tc39.github.io/ecma262/#sec-object.assign
+       var objectAssign = !nativeAssign || fails(function () {
+         // should have correct order of operations (Edge bug)
+         if (descriptors && nativeAssign({ b: 1 }, nativeAssign(defineProperty$7({}, 'a', {
+           enumerable: true,
+           get: function () {
+             defineProperty$7(this, 'b', {
+               value: 3,
+               enumerable: false
+             });
+           }
+         }), { b: 2 })).b !== 1) return true;
+         // should work with symbols and should have deterministic property order (V8 bug)
+         var A = {};
+         var B = {};
+         // eslint-disable-next-line no-undef
+         var symbol = Symbol();
+         var alphabet = 'abcdefghijklmnopqrst';
+         A[symbol] = 7;
+         alphabet.split('').forEach(function (chr) { B[chr] = chr; });
+         return nativeAssign({}, A)[symbol] != 7 || objectKeys(nativeAssign({}, B)).join('') != alphabet;
+       }) ? function assign(target, source) { // eslint-disable-line no-unused-vars
+         var T = toObject(target);
+         var argumentsLength = arguments.length;
+         var index = 1;
+         var getOwnPropertySymbols = objectGetOwnPropertySymbols.f;
+         var propertyIsEnumerable = objectPropertyIsEnumerable.f;
+         while (argumentsLength > index) {
+           var S = indexedObject(arguments[index++]);
+           var keys = getOwnPropertySymbols ? objectKeys(S).concat(getOwnPropertySymbols(S)) : objectKeys(S);
+           var length = keys.length;
+           var j = 0;
+           var key;
+           while (length > j) {
+             key = keys[j++];
+             if (!descriptors || propertyIsEnumerable.call(S, key)) T[key] = S[key];
+           }
+         } return T;
+       } : nativeAssign;
+
+       // `Array.from` method implementation
+       // https://tc39.github.io/ecma262/#sec-array.from
+       var arrayFrom = function from(arrayLike /* , mapfn = undefined, thisArg = undefined */) {
+         var O = toObject(arrayLike);
+         var C = typeof this == 'function' ? this : Array;
+         var argumentsLength = arguments.length;
+         var mapfn = argumentsLength > 1 ? arguments[1] : undefined;
+         var mapping = mapfn !== undefined;
+         var iteratorMethod = getIteratorMethod(O);
+         var index = 0;
+         var length, result, step, iterator, next, value;
+         if (mapping) mapfn = functionBindContext(mapfn, argumentsLength > 2 ? arguments[2] : undefined, 2);
+         // if the target is not iterable or it's an array with the default iterator - use a simple case
+         if (iteratorMethod != undefined && !(C == Array && isArrayIteratorMethod(iteratorMethod))) {
+           iterator = iteratorMethod.call(O);
+           next = iterator.next;
+           result = new C();
+           for (;!(step = next.call(iterator)).done; index++) {
+             value = mapping ? callWithSafeIterationClosing(iterator, mapfn, [step.value, index], true) : step.value;
+             createProperty(result, index, value);
+           }
+         } else {
+           length = toLength(O.length);
+           result = new C(length);
+           for (;length > index; index++) {
+             value = mapping ? mapfn(O[index], index) : O[index];
+             createProperty(result, index, value);
            }
-           self._state = 1;
-           self._value = newValue;
-           finale(self);
-         } catch (e) {
-           reject(self, e);
          }
-       }
+         result.length = index;
+         return result;
+       };
 
-       function reject(self, newValue) {
-         self._state = 2;
-         self._value = newValue;
-         finale(self);
-       }
+       // based on https://github.com/bestiejs/punycode.js/blob/master/punycode.js
+       var maxInt = 2147483647; // aka. 0x7FFFFFFF or 2^31-1
+       var base = 36;
+       var tMin = 1;
+       var tMax = 26;
+       var skew = 38;
+       var damp = 700;
+       var initialBias = 72;
+       var initialN = 128; // 0x80
+       var delimiter = '-'; // '\x2D'
+       var regexNonASCII = /[^\0-\u007E]/; // non-ASCII chars
+       var regexSeparators = /[.\u3002\uFF0E\uFF61]/g; // RFC 3490 separators
+       var OVERFLOW_ERROR = 'Overflow: input needs wider integers to process';
+       var baseMinusTMin = base - tMin;
+       var floor$4 = Math.floor;
+       var stringFromCharCode = String.fromCharCode;
 
-       function finale(self) {
-         if (self._state === 2 && self._deferreds.length === 0) {
-           Promise$1._immediateFn(function() {
-             if (!self._handled) {
-               Promise$1._unhandledRejectionFn(self._value);
+       /**
+        * Creates an array containing the numeric code points of each Unicode
+        * character in the string. While JavaScript uses UCS-2 internally,
+        * this function will convert a pair of surrogate halves (each of which
+        * UCS-2 exposes as separate characters) into a single code point,
+        * matching UTF-16.
+        */
+       var ucs2decode = function (string) {
+         var output = [];
+         var counter = 0;
+         var length = string.length;
+         while (counter < length) {
+           var value = string.charCodeAt(counter++);
+           if (value >= 0xD800 && value <= 0xDBFF && counter < length) {
+             // It's a high surrogate, and there is a next character.
+             var extra = string.charCodeAt(counter++);
+             if ((extra & 0xFC00) == 0xDC00) { // Low surrogate.
+               output.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);
+             } else {
+               // It's an unmatched surrogate; only append this code unit, in case the
+               // next code unit is the high surrogate of a surrogate pair.
+               output.push(value);
+               counter--;
              }
-           });
-         }
-
-         for (var i = 0, len = self._deferreds.length; i < len; i++) {
-           handle(self, self._deferreds[i]);
+           } else {
+             output.push(value);
+           }
          }
-         self._deferreds = null;
-       }
+         return output;
+       };
 
        /**
-        * @constructor
+        * Converts a digit/integer into a basic code point.
         */
-       function Handler(onFulfilled, onRejected, promise) {
-         this.onFulfilled = typeof onFulfilled === 'function' ? onFulfilled : null;
-         this.onRejected = typeof onRejected === 'function' ? onRejected : null;
-         this.promise = promise;
-       }
+       var digitToBasic = function (digit) {
+         //  0..25 map to ASCII a..z or A..Z
+         // 26..35 map to ASCII 0..9
+         return digit + 22 + 75 * (digit < 26);
+       };
 
        /**
-        * Take a potentially misbehaving resolver function and make sure
-        * onFulfilled and onRejected are only called once.
-        *
-        * Makes no guarantees about asynchrony.
+        * Bias adaptation function as per section 3.4 of RFC 3492.
+        * https://tools.ietf.org/html/rfc3492#section-3.4
         */
-       function doResolve(fn, self) {
-         var done = false;
-         try {
-           fn(
-             function(value) {
-               if (done) return;
-               done = true;
-               resolve(self, value);
-             },
-             function(reason) {
-               if (done) return;
-               done = true;
-               reject(self, reason);
-             }
-           );
-         } catch (ex) {
-           if (done) return;
-           done = true;
-           reject(self, ex);
+       var adapt = function (delta, numPoints, firstTime) {
+         var k = 0;
+         delta = firstTime ? floor$4(delta / damp) : delta >> 1;
+         delta += floor$4(delta / numPoints);
+         for (; delta > baseMinusTMin * tMax >> 1; k += base) {
+           delta = floor$4(delta / baseMinusTMin);
          }
-       }
-
-       Promise$1.prototype['catch'] = function(onRejected) {
-         return this.then(null, onRejected);
+         return floor$4(k + (baseMinusTMin + 1) * delta / (delta + skew));
        };
 
-       Promise$1.prototype.then = function(onFulfilled, onRejected) {
-         // @ts-ignore
-         var prom = new this.constructor(noop$1);
+       /**
+        * Converts a string of Unicode symbols (e.g. a domain name label) to a
+        * Punycode string of ASCII-only symbols.
+        */
+       // eslint-disable-next-line  max-statements
+       var encode = function (input) {
+         var output = [];
 
-         handle(this, new Handler(onFulfilled, onRejected, prom));
-         return prom;
-       };
+         // Convert the input in UCS-2 to an array of Unicode code points.
+         input = ucs2decode(input);
 
-       Promise$1.prototype['finally'] = finallyConstructor;
+         // Cache the length.
+         var inputLength = input.length;
 
-       Promise$1.all = function(arr) {
-         return new Promise$1(function(resolve, reject) {
-           if (!isArray$4(arr)) {
-             return reject(new TypeError('Promise.all accepts an array'));
+         // Initialize the state.
+         var n = initialN;
+         var delta = 0;
+         var bias = initialBias;
+         var i, currentValue;
+
+         // Handle the basic code points.
+         for (i = 0; i < input.length; i++) {
+           currentValue = input[i];
+           if (currentValue < 0x80) {
+             output.push(stringFromCharCode(currentValue));
            }
+         }
 
-           var args = Array.prototype.slice.call(arr);
-           if (args.length === 0) return resolve([]);
-           var remaining = args.length;
+         var basicLength = output.length; // number of basic code points.
+         var handledCPCount = basicLength; // number of code points that have been handled;
 
-           function res(i, val) {
-             try {
-               if (val && (typeof val === 'object' || typeof val === 'function')) {
-                 var then = val.then;
-                 if (typeof then === 'function') {
-                   then.call(
-                     val,
-                     function(val) {
-                       res(i, val);
-                     },
-                     reject
-                   );
-                   return;
-                 }
-               }
-               args[i] = val;
-               if (--remaining === 0) {
-                 resolve(args);
-               }
-             } catch (ex) {
-               reject(ex);
+         // Finish the basic string with a delimiter unless it's empty.
+         if (basicLength) {
+           output.push(delimiter);
+         }
+
+         // Main encoding loop:
+         while (handledCPCount < inputLength) {
+           // All non-basic code points < n have been handled already. Find the next larger one:
+           var m = maxInt;
+           for (i = 0; i < input.length; i++) {
+             currentValue = input[i];
+             if (currentValue >= n && currentValue < m) {
+               m = currentValue;
              }
            }
 
-           for (var i = 0; i < args.length; i++) {
-             res(i, args[i]);
+           // Increase `delta` enough to advance the decoder's <n,i> state to <m,0>, but guard against overflow.
+           var handledCPCountPlusOne = handledCPCount + 1;
+           if (m - n > floor$4((maxInt - delta) / handledCPCountPlusOne)) {
+             throw RangeError(OVERFLOW_ERROR);
            }
-         });
-       };
-
-       Promise$1.resolve = function(value) {
-         if (value && typeof value === 'object' && value.constructor === Promise$1) {
-           return value;
-         }
 
-         return new Promise$1(function(resolve) {
-           resolve(value);
-         });
-       };
+           delta += (m - n) * handledCPCountPlusOne;
+           n = m;
 
-       Promise$1.reject = function(value) {
-         return new Promise$1(function(resolve, reject) {
-           reject(value);
-         });
-       };
+           for (i = 0; i < input.length; i++) {
+             currentValue = input[i];
+             if (currentValue < n && ++delta > maxInt) {
+               throw RangeError(OVERFLOW_ERROR);
+             }
+             if (currentValue == n) {
+               // Represent delta as a generalized variable-length integer.
+               var q = delta;
+               for (var k = base; /* no condition */; k += base) {
+                 var t = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);
+                 if (q < t) break;
+                 var qMinusT = q - t;
+                 var baseMinusT = base - t;
+                 output.push(stringFromCharCode(digitToBasic(t + qMinusT % baseMinusT)));
+                 q = floor$4(qMinusT / baseMinusT);
+               }
 
-       Promise$1.race = function(arr) {
-         return new Promise$1(function(resolve, reject) {
-           if (!isArray$4(arr)) {
-             return reject(new TypeError('Promise.race accepts an array'));
+               output.push(stringFromCharCode(digitToBasic(q)));
+               bias = adapt(delta, handledCPCountPlusOne, handledCPCount == basicLength);
+               delta = 0;
+               ++handledCPCount;
+             }
            }
 
-           for (var i = 0, len = arr.length; i < len; i++) {
-             Promise$1.resolve(arr[i]).then(resolve, reject);
-           }
-         });
+           ++delta;
+           ++n;
+         }
+         return output.join('');
        };
 
-       // Use polyfill for setImmediate for performance gains
-       Promise$1._immediateFn =
-         // @ts-ignore
-         (typeof setImmediate === 'function' &&
-           function(fn) {
-             // @ts-ignore
-             setImmediate(fn);
-           }) ||
-         function(fn) {
-           setTimeoutFunc(fn, 0);
-         };
-
-       Promise$1._unhandledRejectionFn = function _unhandledRejectionFn(err) {
-         if (typeof console !== 'undefined' && console) {
-           console.warn('Possible Unhandled Promise Rejection:', err); // eslint-disable-line no-console
+       var stringPunycodeToAscii = function (input) {
+         var encoded = [];
+         var labels = input.toLowerCase().replace(regexSeparators, '\u002E').split('.');
+         var i, label;
+         for (i = 0; i < labels.length; i++) {
+           label = labels[i];
+           encoded.push(regexNonASCII.test(label) ? 'xn--' + encode(label) : label);
          }
+         return encoded.join('.');
        };
 
-       /** @suppress {undefinedVars} */
-       var globalNS = (function() {
-         // the only reliable means to get the global object is
-         // `Function('return this')()`
-         // However, this causes CSP violations in Chrome apps.
-         if (typeof self !== 'undefined') {
-           return self;
-         }
-         if (typeof window !== 'undefined') {
-           return window;
-         }
-         if (typeof global !== 'undefined') {
-           return global;
-         }
-         throw new Error('unable to locate global object');
-       })();
+       var getIterator = function (it) {
+         var iteratorMethod = getIteratorMethod(it);
+         if (typeof iteratorMethod != 'function') {
+           throw TypeError(String(it) + ' is not iterable');
+         } return anObject(iteratorMethod.call(it));
+       };
 
-       if (!('Promise' in globalNS)) {
-         globalNS['Promise'] = Promise$1;
-       } else if (!globalNS.Promise.prototype['finally']) {
-         globalNS.Promise.prototype['finally'] = finallyConstructor;
-       }
+       // TODO: in core-js@4, move /modules/ dependencies to public entries for better optimization by tools like `preset-env`
 
-       var polyfill$e = /*#__PURE__*/Object.freeze({
-               __proto__: null
-       });
 
-       var setAsap = createCommonjsModule(function (module) {
-       (function (thisVar, undefined$1) {
-               var main = (typeof window === 'object' && window) || (typeof commonjsGlobal === 'object' && commonjsGlobal) ||
-                       typeof self === 'object' && self || thisVar;
 
-               var hasSetImmediate = typeof setImmediate === 'function';
-               var hasNextTick = typeof process === 'object' && !!process && typeof process.nextTick === 'function';
-               var index = 0;
 
-               function getNewIndex() {
-                       if (index === 9007199254740991) {
-                               return 0;
-                       }
-                       return ++index;
-               }
-
-               var setAsap = (function () {
-                       var hiddenDiv, scriptEl, timeoutFn, callbacks;
-
-                       // Modern browsers, fastest async
-                       if (main.MutationObserver) {
-                               return function setAsap(callback) {
-                                       hiddenDiv = document.createElement("div");
-                                       (new MutationObserver(function() {
-                                               callback();
-                                               hiddenDiv = null;
-                                       })).observe(hiddenDiv, { attributes: true });
-                                       hiddenDiv.setAttribute('i', '1');
-                               };
-
-                       // Browsers that support postMessage
-                       } else if (!hasSetImmediate && main.postMessage && !main.importScripts && main.addEventListener) {
-
-                               var MESSAGE_PREFIX = "com.setImmediate" + Math.random();
-                               callbacks = {};
-
-                               var onGlobalMessage = function (event) {
-                                       if (event.source === main && event.data.indexOf(MESSAGE_PREFIX) === 0) {
-                                               var i = +event.data.split(':')[1];
-                                               callbacks[i]();
-                                               delete callbacks[i];
-                                       }
-                               };
-
-                               main.addEventListener("message", onGlobalMessage, false);
-
-                               return function setAsap(callback) {
-                                       var i = getNewIndex();
-                                       callbacks[i] = callback;
-                                       main.postMessage(MESSAGE_PREFIX + ':' + i, "*");
-                               };
-
-                               // IE browsers without postMessage
-                       } else if (!hasSetImmediate && main.document && 'onreadystatechange' in document.createElement('script')) {
-
-                               return function setAsap(callback) {
-                                       scriptEl = document.createElement("script");
-                                       scriptEl.onreadystatechange = function onreadystatechange() {
-                                               scriptEl.onreadystatechange = null;
-                                               scriptEl.parentNode.removeChild(scriptEl);
-                                               scriptEl = null;
-                                               callback();
-                                       };
-                                       document.body.appendChild(scriptEl);
-                               };
-
-                       // All other browsers and node
-                       } else {
-
-                               timeoutFn = (hasSetImmediate && setImmediate) || (hasNextTick && process.nextTick) || setTimeout;
-                               return function setAsap(callback) {
-                                       timeoutFn(callback);
-                               };
-                       }
 
-               })();
-
-               if ( module.exports) {
-                       module.exports = setAsap;
-               } else if (typeof commonjsRequire !== 'undefined' && commonjsRequire.amd) {
-                       undefined$1(function () {
-                               return setAsap;
-                       });
-               } else {
-                       main.setAsap = setAsap;
-               }
-       })(commonjsGlobal);
-       });
 
-       var performanceNow = createCommonjsModule(function (module) {
-       // Generated by CoffeeScript 1.12.2
-       (function() {
-         var getNanoSeconds, hrtime, loadTime, moduleLoadTime, nodeLoadTime, upTime;
 
-         if ((typeof performance !== "undefined" && performance !== null) && performance.now) {
-           module.exports = function() {
-             return performance.now();
-           };
-         } else if ((typeof process !== "undefined" && process !== null) && process.hrtime) {
-           module.exports = function() {
-             return (getNanoSeconds() - nodeLoadTime) / 1e6;
-           };
-           hrtime = process.hrtime;
-           getNanoSeconds = function() {
-             var hr;
-             hr = hrtime();
-             return hr[0] * 1e9 + hr[1];
-           };
-           moduleLoadTime = getNanoSeconds();
-           upTime = process.uptime() * 1e9;
-           nodeLoadTime = moduleLoadTime - upTime;
-         } else if (Date.now) {
-           module.exports = function() {
-             return Date.now() - loadTime;
-           };
-           loadTime = Date.now();
-         } else {
-           module.exports = function() {
-             return new Date().getTime() - loadTime;
-           };
-           loadTime = new Date().getTime();
-         }
 
-       }).call(commonjsGlobal);
 
 
-       });
 
-       var root = typeof window === 'undefined' ? commonjsGlobal : window
-         , vendors = ['moz', 'webkit']
-         , suffix = 'AnimationFrame'
-         , raf = root['request' + suffix]
-         , caf = root['cancel' + suffix] || root['cancelRequest' + suffix];
-
-       for(var i = 0; !raf && i < vendors.length; i++) {
-         raf = root[vendors[i] + 'Request' + suffix];
-         caf = root[vendors[i] + 'Cancel' + suffix]
-             || root[vendors[i] + 'CancelRequest' + suffix];
-       }
-
-       // Some versions of FF have rAF but not cAF
-       if(!raf || !caf) {
-         var last = 0
-           , id$2 = 0
-           , queue = []
-           , frameDuration = 1000 / 60;
-
-         raf = function(callback) {
-           if(queue.length === 0) {
-             var _now = performanceNow()
-               , next = Math.max(0, frameDuration - (_now - last));
-             last = next + _now;
-             setTimeout(function() {
-               var cp = queue.slice(0);
-               // Clear queue here to prevent
-               // callbacks from appending listeners
-               // to the current frame's queue
-               queue.length = 0;
-               for(var i = 0; i < cp.length; i++) {
-                 if(!cp[i].cancelled) {
-                   try{
-                     cp[i].callback(last);
-                   } catch(e) {
-                     setTimeout(function() { throw e }, 0);
-                   }
-                 }
-               }
-             }, Math.round(next));
-           }
-           queue.push({
-             handle: ++id$2,
-             callback: callback,
-             cancelled: false
-           });
-           return id$2
-         };
 
-         caf = function(handle) {
-           for(var i = 0; i < queue.length; i++) {
-             if(queue[i].handle === handle) {
-               queue[i].cancelled = true;
-             }
-           }
-         };
-       }
 
-       var raf_1 = function(fn) {
-         // Wrap in a new function to prevent
-         // `cancel` potentially being assigned
-         // to the native rAF function
-         return raf.call(root, fn)
-       };
-       var cancel = function() {
-         caf.apply(root, arguments);
-       };
-       var polyfill$f = function(object) {
-         if (!object) {
-           object = root;
-         }
-         object.requestAnimationFrame = raf;
-         object.cancelAnimationFrame = caf;
-       };
-       raf_1.cancel = cancel;
-       raf_1.polyfill = polyfill$f;
 
-       var global$1 = (function(self) {
-         return self
-         // eslint-disable-next-line no-invalid-this
-       })(typeof self !== 'undefined' ? self : undefined);
-       var support = {
-         searchParams: 'URLSearchParams' in global$1,
-         iterable: 'Symbol' in global$1 && 'iterator' in Symbol,
-         blob:
-           'FileReader' in global$1 &&
-           'Blob' in global$1 &&
-           (function() {
-             try {
-               new Blob();
-               return true
-             } catch (e) {
-               return false
-             }
-           })(),
-         formData: 'FormData' in global$1,
-         arrayBuffer: 'ArrayBuffer' in global$1
-       };
 
-       function isDataView(obj) {
-         return obj && DataView.prototype.isPrototypeOf(obj)
-       }
 
-       if (support.arrayBuffer) {
-         var viewClasses = [
-           '[object Int8Array]',
-           '[object Uint8Array]',
-           '[object Uint8ClampedArray]',
-           '[object Int16Array]',
-           '[object Uint16Array]',
-           '[object Int32Array]',
-           '[object Uint32Array]',
-           '[object Float32Array]',
-           '[object Float64Array]'
-         ];
 
-         var isArrayBufferView =
-           ArrayBuffer.isView ||
-           function(obj) {
-             return obj && viewClasses.indexOf(Object.prototype.toString.call(obj)) > -1
-           };
-       }
 
-       function normalizeName(name) {
-         if (typeof name !== 'string') {
-           name = String(name);
-         }
-         if (/[^a-z0-9\-#$%&'*+.^_`|~!]/i.test(name) || name === '') {
-           throw new TypeError('Invalid character in header field name')
-         }
-         return name.toLowerCase()
-       }
 
-       function normalizeValue(value) {
-         if (typeof value !== 'string') {
-           value = String(value);
-         }
-         return value
-       }
 
-       // Build a destructive iterator for the value list
-       function iteratorFor(items) {
-         var iterator = {
-           next: function() {
-             var value = items.shift();
-             return {done: value === undefined, value: value}
-           }
-         };
 
-         if (support.iterable) {
-           iterator[Symbol.iterator] = function() {
-             return iterator
-           };
-         }
+       var $fetch$1 = getBuiltIn('fetch');
+       var Headers = getBuiltIn('Headers');
+       var ITERATOR$8 = wellKnownSymbol('iterator');
+       var URL_SEARCH_PARAMS = 'URLSearchParams';
+       var URL_SEARCH_PARAMS_ITERATOR = URL_SEARCH_PARAMS + 'Iterator';
+       var setInternalState$5 = internalState.set;
+       var getInternalParamsState = internalState.getterFor(URL_SEARCH_PARAMS);
+       var getInternalIteratorState = internalState.getterFor(URL_SEARCH_PARAMS_ITERATOR);
 
-         return iterator
-       }
+       var plus = /\+/g;
+       var sequences = Array(4);
 
-       function Headers(headers) {
-         this.map = {};
+       var percentSequence = function (bytes) {
+         return sequences[bytes - 1] || (sequences[bytes - 1] = RegExp('((?:%[\\da-f]{2}){' + bytes + '})', 'gi'));
+       };
 
-         if (headers instanceof Headers) {
-           headers.forEach(function(value, name) {
-             this.append(name, value);
-           }, this);
-         } else if (Array.isArray(headers)) {
-           headers.forEach(function(header) {
-             this.append(header[0], header[1]);
-           }, this);
-         } else if (headers) {
-           Object.getOwnPropertyNames(headers).forEach(function(name) {
-             this.append(name, headers[name]);
-           }, this);
+       var percentDecode = function (sequence) {
+         try {
+           return decodeURIComponent(sequence);
+         } catch (error) {
+           return sequence;
          }
-       }
-
-       Headers.prototype.append = function(name, value) {
-         name = normalizeName(name);
-         value = normalizeValue(value);
-         var oldValue = this.map[name];
-         this.map[name] = oldValue ? oldValue + ', ' + value : value;
        };
 
-       Headers.prototype['delete'] = function(name) {
-         delete this.map[normalizeName(name)];
+       var deserialize = function (it) {
+         var result = it.replace(plus, ' ');
+         var bytes = 4;
+         try {
+           return decodeURIComponent(result);
+         } catch (error) {
+           while (bytes) {
+             result = result.replace(percentSequence(bytes--), percentDecode);
+           }
+           return result;
+         }
        };
 
-       Headers.prototype.get = function(name) {
-         name = normalizeName(name);
-         return this.has(name) ? this.map[name] : null
+       var find = /[!'()~]|%20/g;
+
+       var replace = {
+         '!': '%21',
+         "'": '%27',
+         '(': '%28',
+         ')': '%29',
+         '~': '%7E',
+         '%20': '+'
        };
 
-       Headers.prototype.has = function(name) {
-         return this.map.hasOwnProperty(normalizeName(name))
+       var replacer = function (match) {
+         return replace[match];
        };
 
-       Headers.prototype.set = function(name, value) {
-         this.map[normalizeName(name)] = normalizeValue(value);
+       var serialize = function (it) {
+         return encodeURIComponent(it).replace(find, replacer);
        };
 
-       Headers.prototype.forEach = function(callback, thisArg) {
-         for (var name in this.map) {
-           if (this.map.hasOwnProperty(name)) {
-             callback.call(thisArg, this.map[name], name, this);
+       var parseSearchParams = function (result, query) {
+         if (query) {
+           var attributes = query.split('&');
+           var index = 0;
+           var attribute, entry;
+           while (index < attributes.length) {
+             attribute = attributes[index++];
+             if (attribute.length) {
+               entry = attribute.split('=');
+               result.push({
+                 key: deserialize(entry.shift()),
+                 value: deserialize(entry.join('='))
+               });
+             }
            }
          }
        };
 
-       Headers.prototype.keys = function() {
-         var items = [];
-         this.forEach(function(value, name) {
-           items.push(name);
-         });
-         return iteratorFor(items)
+       var updateSearchParams = function (query) {
+         this.entries.length = 0;
+         parseSearchParams(this.entries, query);
        };
 
-       Headers.prototype.values = function() {
-         var items = [];
-         this.forEach(function(value) {
-           items.push(value);
-         });
-         return iteratorFor(items)
+       var validateArgumentsLength = function (passed, required) {
+         if (passed < required) throw TypeError('Not enough arguments');
        };
 
-       Headers.prototype.entries = function() {
-         var items = [];
-         this.forEach(function(value, name) {
-           items.push([name, value]);
+       var URLSearchParamsIterator = createIteratorConstructor(function Iterator(params, kind) {
+         setInternalState$5(this, {
+           type: URL_SEARCH_PARAMS_ITERATOR,
+           iterator: getIterator(getInternalParamsState(params).entries),
+           kind: kind
          });
-         return iteratorFor(items)
-       };
+       }, 'Iterator', function next() {
+         var state = getInternalIteratorState(this);
+         var kind = state.kind;
+         var step = state.iterator.next();
+         var entry = step.value;
+         if (!step.done) {
+           step.value = kind === 'keys' ? entry.key : kind === 'values' ? entry.value : [entry.key, entry.value];
+         } return step;
+       });
 
-       if (support.iterable) {
-         Headers.prototype[Symbol.iterator] = Headers.prototype.entries;
-       }
+       // `URLSearchParams` constructor
+       // https://url.spec.whatwg.org/#interface-urlsearchparams
+       var URLSearchParamsConstructor = function URLSearchParams(/* init */) {
+         anInstance(this, URLSearchParamsConstructor, URL_SEARCH_PARAMS);
+         var init = arguments.length > 0 ? arguments[0] : undefined;
+         var that = this;
+         var entries = [];
+         var iteratorMethod, iterator, next, step, entryIterator, entryNext, first, second, key;
+
+         setInternalState$5(that, {
+           type: URL_SEARCH_PARAMS,
+           entries: entries,
+           updateURL: function () { /* empty */ },
+           updateSearchParams: updateSearchParams
+         });
 
-       function consumed(body) {
-         if (body.bodyUsed) {
-           return Promise.reject(new TypeError('Already read'))
+         if (init !== undefined) {
+           if (isObject(init)) {
+             iteratorMethod = getIteratorMethod(init);
+             if (typeof iteratorMethod === 'function') {
+               iterator = iteratorMethod.call(init);
+               next = iterator.next;
+               while (!(step = next.call(iterator)).done) {
+                 entryIterator = getIterator(anObject(step.value));
+                 entryNext = entryIterator.next;
+                 if (
+                   (first = entryNext.call(entryIterator)).done ||
+                   (second = entryNext.call(entryIterator)).done ||
+                   !entryNext.call(entryIterator).done
+                 ) throw TypeError('Expected sequence with length 2');
+                 entries.push({ key: first.value + '', value: second.value + '' });
+               }
+             } else for (key in init) if (has(init, key)) entries.push({ key: key, value: init[key] + '' });
+           } else {
+             parseSearchParams(entries, typeof init === 'string' ? init.charAt(0) === '?' ? init.slice(1) : init : init + '');
+           }
          }
-         body.bodyUsed = true;
+       };
+
+       var URLSearchParamsPrototype = URLSearchParamsConstructor.prototype;
+
+       redefineAll(URLSearchParamsPrototype, {
+         // `URLSearchParams.prototype.appent` method
+         // https://url.spec.whatwg.org/#dom-urlsearchparams-append
+         append: function append(name, value) {
+           validateArgumentsLength(arguments.length, 2);
+           var state = getInternalParamsState(this);
+           state.entries.push({ key: name + '', value: value + '' });
+           state.updateURL();
+         },
+         // `URLSearchParams.prototype.delete` method
+         // https://url.spec.whatwg.org/#dom-urlsearchparams-delete
+         'delete': function (name) {
+           validateArgumentsLength(arguments.length, 1);
+           var state = getInternalParamsState(this);
+           var entries = state.entries;
+           var key = name + '';
+           var index = 0;
+           while (index < entries.length) {
+             if (entries[index].key === key) entries.splice(index, 1);
+             else index++;
+           }
+           state.updateURL();
+         },
+         // `URLSearchParams.prototype.get` method
+         // https://url.spec.whatwg.org/#dom-urlsearchparams-get
+         get: function get(name) {
+           validateArgumentsLength(arguments.length, 1);
+           var entries = getInternalParamsState(this).entries;
+           var key = name + '';
+           var index = 0;
+           for (; index < entries.length; index++) {
+             if (entries[index].key === key) return entries[index].value;
+           }
+           return null;
+         },
+         // `URLSearchParams.prototype.getAll` method
+         // https://url.spec.whatwg.org/#dom-urlsearchparams-getall
+         getAll: function getAll(name) {
+           validateArgumentsLength(arguments.length, 1);
+           var entries = getInternalParamsState(this).entries;
+           var key = name + '';
+           var result = [];
+           var index = 0;
+           for (; index < entries.length; index++) {
+             if (entries[index].key === key) result.push(entries[index].value);
+           }
+           return result;
+         },
+         // `URLSearchParams.prototype.has` method
+         // https://url.spec.whatwg.org/#dom-urlsearchparams-has
+         has: function has(name) {
+           validateArgumentsLength(arguments.length, 1);
+           var entries = getInternalParamsState(this).entries;
+           var key = name + '';
+           var index = 0;
+           while (index < entries.length) {
+             if (entries[index++].key === key) return true;
+           }
+           return false;
+         },
+         // `URLSearchParams.prototype.set` method
+         // https://url.spec.whatwg.org/#dom-urlsearchparams-set
+         set: function set(name, value) {
+           validateArgumentsLength(arguments.length, 1);
+           var state = getInternalParamsState(this);
+           var entries = state.entries;
+           var found = false;
+           var key = name + '';
+           var val = value + '';
+           var index = 0;
+           var entry;
+           for (; index < entries.length; index++) {
+             entry = entries[index];
+             if (entry.key === key) {
+               if (found) entries.splice(index--, 1);
+               else {
+                 found = true;
+                 entry.value = val;
+               }
+             }
+           }
+           if (!found) entries.push({ key: key, value: val });
+           state.updateURL();
+         },
+         // `URLSearchParams.prototype.sort` method
+         // https://url.spec.whatwg.org/#dom-urlsearchparams-sort
+         sort: function sort() {
+           var state = getInternalParamsState(this);
+           var entries = state.entries;
+           // Array#sort is not stable in some engines
+           var slice = entries.slice();
+           var entry, entriesIndex, sliceIndex;
+           entries.length = 0;
+           for (sliceIndex = 0; sliceIndex < slice.length; sliceIndex++) {
+             entry = slice[sliceIndex];
+             for (entriesIndex = 0; entriesIndex < sliceIndex; entriesIndex++) {
+               if (entries[entriesIndex].key > entry.key) {
+                 entries.splice(entriesIndex, 0, entry);
+                 break;
+               }
+             }
+             if (entriesIndex === sliceIndex) entries.push(entry);
+           }
+           state.updateURL();
+         },
+         // `URLSearchParams.prototype.forEach` method
+         forEach: function forEach(callback /* , thisArg */) {
+           var entries = getInternalParamsState(this).entries;
+           var boundFunction = functionBindContext(callback, arguments.length > 1 ? arguments[1] : undefined, 3);
+           var index = 0;
+           var entry;
+           while (index < entries.length) {
+             entry = entries[index++];
+             boundFunction(entry.value, entry.key, this);
+           }
+         },
+         // `URLSearchParams.prototype.keys` method
+         keys: function keys() {
+           return new URLSearchParamsIterator(this, 'keys');
+         },
+         // `URLSearchParams.prototype.values` method
+         values: function values() {
+           return new URLSearchParamsIterator(this, 'values');
+         },
+         // `URLSearchParams.prototype.entries` method
+         entries: function entries() {
+           return new URLSearchParamsIterator(this, 'entries');
+         }
+       }, { enumerable: true });
+
+       // `URLSearchParams.prototype[@@iterator]` method
+       redefine(URLSearchParamsPrototype, ITERATOR$8, URLSearchParamsPrototype.entries);
+
+       // `URLSearchParams.prototype.toString` method
+       // https://url.spec.whatwg.org/#urlsearchparams-stringification-behavior
+       redefine(URLSearchParamsPrototype, 'toString', function toString() {
+         var entries = getInternalParamsState(this).entries;
+         var result = [];
+         var index = 0;
+         var entry;
+         while (index < entries.length) {
+           entry = entries[index++];
+           result.push(serialize(entry.key) + '=' + serialize(entry.value));
+         } return result.join('&');
+       }, { enumerable: true });
+
+       setToStringTag(URLSearchParamsConstructor, URL_SEARCH_PARAMS);
+
+       _export({ global: true, forced: !nativeUrl }, {
+         URLSearchParams: URLSearchParamsConstructor
+       });
+
+       // Wrap `fetch` for correct work with polyfilled `URLSearchParams`
+       // https://github.com/zloirock/core-js/issues/674
+       if (!nativeUrl && typeof $fetch$1 == 'function' && typeof Headers == 'function') {
+         _export({ global: true, enumerable: true, forced: true }, {
+           fetch: function fetch(input /* , init */) {
+             var args = [input];
+             var init, body, headers;
+             if (arguments.length > 1) {
+               init = arguments[1];
+               if (isObject(init)) {
+                 body = init.body;
+                 if (classof(body) === URL_SEARCH_PARAMS) {
+                   headers = init.headers ? new Headers(init.headers) : new Headers();
+                   if (!headers.has('content-type')) {
+                     headers.set('content-type', 'application/x-www-form-urlencoded;charset=UTF-8');
+                   }
+                   init = objectCreate(init, {
+                     body: createPropertyDescriptor(0, String(body)),
+                     headers: createPropertyDescriptor(0, headers)
+                   });
+                 }
+               }
+               args.push(init);
+             } return $fetch$1.apply(this, args);
+           }
+         });
+       }
+
+       var web_urlSearchParams = {
+         URLSearchParams: URLSearchParamsConstructor,
+         getState: getInternalParamsState
+       };
+
+       // TODO: in core-js@4, move /modules/ dependencies to public entries for better optimization by tools like `preset-env`
+
+
+
+
+
+
+
+
+
+
+
+       var codeAt = stringMultibyte.codeAt;
+
+
+
+
+
+       var NativeURL = global_1.URL;
+       var URLSearchParams$1 = web_urlSearchParams.URLSearchParams;
+       var getInternalSearchParamsState = web_urlSearchParams.getState;
+       var setInternalState$6 = internalState.set;
+       var getInternalURLState = internalState.getterFor('URL');
+       var floor$5 = Math.floor;
+       var pow$1 = Math.pow;
+
+       var INVALID_AUTHORITY = 'Invalid authority';
+       var INVALID_SCHEME = 'Invalid scheme';
+       var INVALID_HOST = 'Invalid host';
+       var INVALID_PORT = 'Invalid port';
+
+       var ALPHA = /[A-Za-z]/;
+       var ALPHANUMERIC = /[\d+-.A-Za-z]/;
+       var DIGIT = /\d/;
+       var HEX_START = /^(0x|0X)/;
+       var OCT = /^[0-7]+$/;
+       var DEC = /^\d+$/;
+       var HEX = /^[\dA-Fa-f]+$/;
+       // eslint-disable-next-line no-control-regex
+       var FORBIDDEN_HOST_CODE_POINT = /[\u0000\u0009\u000A\u000D #%/:?@[\\]]/;
+       // eslint-disable-next-line no-control-regex
+       var FORBIDDEN_HOST_CODE_POINT_EXCLUDING_PERCENT = /[\u0000\u0009\u000A\u000D #/:?@[\\]]/;
+       // eslint-disable-next-line no-control-regex
+       var LEADING_AND_TRAILING_C0_CONTROL_OR_SPACE = /^[\u0000-\u001F ]+|[\u0000-\u001F ]+$/g;
+       // eslint-disable-next-line no-control-regex
+       var TAB_AND_NEW_LINE = /[\u0009\u000A\u000D]/g;
+       var EOF;
+
+       var parseHost = function (url, input) {
+         var result, codePoints, index;
+         if (input.charAt(0) == '[') {
+           if (input.charAt(input.length - 1) != ']') return INVALID_HOST;
+           result = parseIPv6(input.slice(1, -1));
+           if (!result) return INVALID_HOST;
+           url.host = result;
+         // opaque host
+         } else if (!isSpecial(url)) {
+           if (FORBIDDEN_HOST_CODE_POINT_EXCLUDING_PERCENT.test(input)) return INVALID_HOST;
+           result = '';
+           codePoints = arrayFrom(input);
+           for (index = 0; index < codePoints.length; index++) {
+             result += percentEncode(codePoints[index], C0ControlPercentEncodeSet);
+           }
+           url.host = result;
+         } else {
+           input = stringPunycodeToAscii(input);
+           if (FORBIDDEN_HOST_CODE_POINT.test(input)) return INVALID_HOST;
+           result = parseIPv4(input);
+           if (result === null) return INVALID_HOST;
+           url.host = result;
+         }
+       };
+
+       var parseIPv4 = function (input) {
+         var parts = input.split('.');
+         var partsLength, numbers, index, part, radix, number, ipv4;
+         if (parts.length && parts[parts.length - 1] == '') {
+           parts.pop();
+         }
+         partsLength = parts.length;
+         if (partsLength > 4) return input;
+         numbers = [];
+         for (index = 0; index < partsLength; index++) {
+           part = parts[index];
+           if (part == '') return input;
+           radix = 10;
+           if (part.length > 1 && part.charAt(0) == '0') {
+             radix = HEX_START.test(part) ? 16 : 8;
+             part = part.slice(radix == 8 ? 1 : 2);
+           }
+           if (part === '') {
+             number = 0;
+           } else {
+             if (!(radix == 10 ? DEC : radix == 8 ? OCT : HEX).test(part)) return input;
+             number = parseInt(part, radix);
+           }
+           numbers.push(number);
+         }
+         for (index = 0; index < partsLength; index++) {
+           number = numbers[index];
+           if (index == partsLength - 1) {
+             if (number >= pow$1(256, 5 - partsLength)) return null;
+           } else if (number > 255) return null;
+         }
+         ipv4 = numbers.pop();
+         for (index = 0; index < numbers.length; index++) {
+           ipv4 += numbers[index] * pow$1(256, 3 - index);
+         }
+         return ipv4;
+       };
+
+       // eslint-disable-next-line max-statements
+       var parseIPv6 = function (input) {
+         var address = [0, 0, 0, 0, 0, 0, 0, 0];
+         var pieceIndex = 0;
+         var compress = null;
+         var pointer = 0;
+         var value, length, numbersSeen, ipv4Piece, number, swaps, swap;
+
+         var char = function () {
+           return input.charAt(pointer);
+         };
+
+         if (char() == ':') {
+           if (input.charAt(1) != ':') return;
+           pointer += 2;
+           pieceIndex++;
+           compress = pieceIndex;
+         }
+         while (char()) {
+           if (pieceIndex == 8) return;
+           if (char() == ':') {
+             if (compress !== null) return;
+             pointer++;
+             pieceIndex++;
+             compress = pieceIndex;
+             continue;
+           }
+           value = length = 0;
+           while (length < 4 && HEX.test(char())) {
+             value = value * 16 + parseInt(char(), 16);
+             pointer++;
+             length++;
+           }
+           if (char() == '.') {
+             if (length == 0) return;
+             pointer -= length;
+             if (pieceIndex > 6) return;
+             numbersSeen = 0;
+             while (char()) {
+               ipv4Piece = null;
+               if (numbersSeen > 0) {
+                 if (char() == '.' && numbersSeen < 4) pointer++;
+                 else return;
+               }
+               if (!DIGIT.test(char())) return;
+               while (DIGIT.test(char())) {
+                 number = parseInt(char(), 10);
+                 if (ipv4Piece === null) ipv4Piece = number;
+                 else if (ipv4Piece == 0) return;
+                 else ipv4Piece = ipv4Piece * 10 + number;
+                 if (ipv4Piece > 255) return;
+                 pointer++;
+               }
+               address[pieceIndex] = address[pieceIndex] * 256 + ipv4Piece;
+               numbersSeen++;
+               if (numbersSeen == 2 || numbersSeen == 4) pieceIndex++;
+             }
+             if (numbersSeen != 4) return;
+             break;
+           } else if (char() == ':') {
+             pointer++;
+             if (!char()) return;
+           } else if (char()) return;
+           address[pieceIndex++] = value;
+         }
+         if (compress !== null) {
+           swaps = pieceIndex - compress;
+           pieceIndex = 7;
+           while (pieceIndex != 0 && swaps > 0) {
+             swap = address[pieceIndex];
+             address[pieceIndex--] = address[compress + swaps - 1];
+             address[compress + --swaps] = swap;
+           }
+         } else if (pieceIndex != 8) return;
+         return address;
+       };
+
+       var findLongestZeroSequence = function (ipv6) {
+         var maxIndex = null;
+         var maxLength = 1;
+         var currStart = null;
+         var currLength = 0;
+         var index = 0;
+         for (; index < 8; index++) {
+           if (ipv6[index] !== 0) {
+             if (currLength > maxLength) {
+               maxIndex = currStart;
+               maxLength = currLength;
+             }
+             currStart = null;
+             currLength = 0;
+           } else {
+             if (currStart === null) currStart = index;
+             ++currLength;
+           }
+         }
+         if (currLength > maxLength) {
+           maxIndex = currStart;
+           maxLength = currLength;
+         }
+         return maxIndex;
+       };
+
+       var serializeHost = function (host) {
+         var result, index, compress, ignore0;
+         // ipv4
+         if (typeof host == 'number') {
+           result = [];
+           for (index = 0; index < 4; index++) {
+             result.unshift(host % 256);
+             host = floor$5(host / 256);
+           } return result.join('.');
+         // ipv6
+         } else if (typeof host == 'object') {
+           result = '';
+           compress = findLongestZeroSequence(host);
+           for (index = 0; index < 8; index++) {
+             if (ignore0 && host[index] === 0) continue;
+             if (ignore0) ignore0 = false;
+             if (compress === index) {
+               result += index ? ':' : '::';
+               ignore0 = true;
+             } else {
+               result += host[index].toString(16);
+               if (index < 7) result += ':';
+             }
+           }
+           return '[' + result + ']';
+         } return host;
+       };
+
+       var C0ControlPercentEncodeSet = {};
+       var fragmentPercentEncodeSet = objectAssign({}, C0ControlPercentEncodeSet, {
+         ' ': 1, '"': 1, '<': 1, '>': 1, '`': 1
+       });
+       var pathPercentEncodeSet = objectAssign({}, fragmentPercentEncodeSet, {
+         '#': 1, '?': 1, '{': 1, '}': 1
+       });
+       var userinfoPercentEncodeSet = objectAssign({}, pathPercentEncodeSet, {
+         '/': 1, ':': 1, ';': 1, '=': 1, '@': 1, '[': 1, '\\': 1, ']': 1, '^': 1, '|': 1
+       });
+
+       var percentEncode = function (char, set) {
+         var code = codeAt(char, 0);
+         return code > 0x20 && code < 0x7F && !has(set, char) ? char : encodeURIComponent(char);
+       };
+
+       var specialSchemes = {
+         ftp: 21,
+         file: null,
+         http: 80,
+         https: 443,
+         ws: 80,
+         wss: 443
+       };
+
+       var isSpecial = function (url) {
+         return has(specialSchemes, url.scheme);
+       };
+
+       var includesCredentials = function (url) {
+         return url.username != '' || url.password != '';
+       };
+
+       var cannotHaveUsernamePasswordPort = function (url) {
+         return !url.host || url.cannotBeABaseURL || url.scheme == 'file';
+       };
+
+       var isWindowsDriveLetter = function (string, normalized) {
+         var second;
+         return string.length == 2 && ALPHA.test(string.charAt(0))
+           && ((second = string.charAt(1)) == ':' || (!normalized && second == '|'));
+       };
+
+       var startsWithWindowsDriveLetter = function (string) {
+         var third;
+         return string.length > 1 && isWindowsDriveLetter(string.slice(0, 2)) && (
+           string.length == 2 ||
+           ((third = string.charAt(2)) === '/' || third === '\\' || third === '?' || third === '#')
+         );
+       };
+
+       var shortenURLsPath = function (url) {
+         var path = url.path;
+         var pathSize = path.length;
+         if (pathSize && (url.scheme != 'file' || pathSize != 1 || !isWindowsDriveLetter(path[0], true))) {
+           path.pop();
+         }
+       };
+
+       var isSingleDot = function (segment) {
+         return segment === '.' || segment.toLowerCase() === '%2e';
+       };
+
+       var isDoubleDot = function (segment) {
+         segment = segment.toLowerCase();
+         return segment === '..' || segment === '%2e.' || segment === '.%2e' || segment === '%2e%2e';
+       };
+
+       // States:
+       var SCHEME_START = {};
+       var SCHEME = {};
+       var NO_SCHEME = {};
+       var SPECIAL_RELATIVE_OR_AUTHORITY = {};
+       var PATH_OR_AUTHORITY = {};
+       var RELATIVE = {};
+       var RELATIVE_SLASH = {};
+       var SPECIAL_AUTHORITY_SLASHES = {};
+       var SPECIAL_AUTHORITY_IGNORE_SLASHES = {};
+       var AUTHORITY = {};
+       var HOST = {};
+       var HOSTNAME = {};
+       var PORT = {};
+       var FILE = {};
+       var FILE_SLASH = {};
+       var FILE_HOST = {};
+       var PATH_START = {};
+       var PATH = {};
+       var CANNOT_BE_A_BASE_URL_PATH = {};
+       var QUERY = {};
+       var FRAGMENT = {};
+
+       // eslint-disable-next-line max-statements
+       var parseURL = function (url, input, stateOverride, base) {
+         var state = stateOverride || SCHEME_START;
+         var pointer = 0;
+         var buffer = '';
+         var seenAt = false;
+         var seenBracket = false;
+         var seenPasswordToken = false;
+         var codePoints, char, bufferCodePoints, failure;
+
+         if (!stateOverride) {
+           url.scheme = '';
+           url.username = '';
+           url.password = '';
+           url.host = null;
+           url.port = null;
+           url.path = [];
+           url.query = null;
+           url.fragment = null;
+           url.cannotBeABaseURL = false;
+           input = input.replace(LEADING_AND_TRAILING_C0_CONTROL_OR_SPACE, '');
+         }
+
+         input = input.replace(TAB_AND_NEW_LINE, '');
+
+         codePoints = arrayFrom(input);
+
+         while (pointer <= codePoints.length) {
+           char = codePoints[pointer];
+           switch (state) {
+             case SCHEME_START:
+               if (char && ALPHA.test(char)) {
+                 buffer += char.toLowerCase();
+                 state = SCHEME;
+               } else if (!stateOverride) {
+                 state = NO_SCHEME;
+                 continue;
+               } else return INVALID_SCHEME;
+               break;
+
+             case SCHEME:
+               if (char && (ALPHANUMERIC.test(char) || char == '+' || char == '-' || char == '.')) {
+                 buffer += char.toLowerCase();
+               } else if (char == ':') {
+                 if (stateOverride && (
+                   (isSpecial(url) != has(specialSchemes, buffer)) ||
+                   (buffer == 'file' && (includesCredentials(url) || url.port !== null)) ||
+                   (url.scheme == 'file' && !url.host)
+                 )) return;
+                 url.scheme = buffer;
+                 if (stateOverride) {
+                   if (isSpecial(url) && specialSchemes[url.scheme] == url.port) url.port = null;
+                   return;
+                 }
+                 buffer = '';
+                 if (url.scheme == 'file') {
+                   state = FILE;
+                 } else if (isSpecial(url) && base && base.scheme == url.scheme) {
+                   state = SPECIAL_RELATIVE_OR_AUTHORITY;
+                 } else if (isSpecial(url)) {
+                   state = SPECIAL_AUTHORITY_SLASHES;
+                 } else if (codePoints[pointer + 1] == '/') {
+                   state = PATH_OR_AUTHORITY;
+                   pointer++;
+                 } else {
+                   url.cannotBeABaseURL = true;
+                   url.path.push('');
+                   state = CANNOT_BE_A_BASE_URL_PATH;
+                 }
+               } else if (!stateOverride) {
+                 buffer = '';
+                 state = NO_SCHEME;
+                 pointer = 0;
+                 continue;
+               } else return INVALID_SCHEME;
+               break;
+
+             case NO_SCHEME:
+               if (!base || (base.cannotBeABaseURL && char != '#')) return INVALID_SCHEME;
+               if (base.cannotBeABaseURL && char == '#') {
+                 url.scheme = base.scheme;
+                 url.path = base.path.slice();
+                 url.query = base.query;
+                 url.fragment = '';
+                 url.cannotBeABaseURL = true;
+                 state = FRAGMENT;
+                 break;
+               }
+               state = base.scheme == 'file' ? FILE : RELATIVE;
+               continue;
+
+             case SPECIAL_RELATIVE_OR_AUTHORITY:
+               if (char == '/' && codePoints[pointer + 1] == '/') {
+                 state = SPECIAL_AUTHORITY_IGNORE_SLASHES;
+                 pointer++;
+               } else {
+                 state = RELATIVE;
+                 continue;
+               } break;
+
+             case PATH_OR_AUTHORITY:
+               if (char == '/') {
+                 state = AUTHORITY;
+                 break;
+               } else {
+                 state = PATH;
+                 continue;
+               }
+
+             case RELATIVE:
+               url.scheme = base.scheme;
+               if (char == EOF) {
+                 url.username = base.username;
+                 url.password = base.password;
+                 url.host = base.host;
+                 url.port = base.port;
+                 url.path = base.path.slice();
+                 url.query = base.query;
+               } else if (char == '/' || (char == '\\' && isSpecial(url))) {
+                 state = RELATIVE_SLASH;
+               } else if (char == '?') {
+                 url.username = base.username;
+                 url.password = base.password;
+                 url.host = base.host;
+                 url.port = base.port;
+                 url.path = base.path.slice();
+                 url.query = '';
+                 state = QUERY;
+               } else if (char == '#') {
+                 url.username = base.username;
+                 url.password = base.password;
+                 url.host = base.host;
+                 url.port = base.port;
+                 url.path = base.path.slice();
+                 url.query = base.query;
+                 url.fragment = '';
+                 state = FRAGMENT;
+               } else {
+                 url.username = base.username;
+                 url.password = base.password;
+                 url.host = base.host;
+                 url.port = base.port;
+                 url.path = base.path.slice();
+                 url.path.pop();
+                 state = PATH;
+                 continue;
+               } break;
+
+             case RELATIVE_SLASH:
+               if (isSpecial(url) && (char == '/' || char == '\\')) {
+                 state = SPECIAL_AUTHORITY_IGNORE_SLASHES;
+               } else if (char == '/') {
+                 state = AUTHORITY;
+               } else {
+                 url.username = base.username;
+                 url.password = base.password;
+                 url.host = base.host;
+                 url.port = base.port;
+                 state = PATH;
+                 continue;
+               } break;
+
+             case SPECIAL_AUTHORITY_SLASHES:
+               state = SPECIAL_AUTHORITY_IGNORE_SLASHES;
+               if (char != '/' || buffer.charAt(pointer + 1) != '/') continue;
+               pointer++;
+               break;
+
+             case SPECIAL_AUTHORITY_IGNORE_SLASHES:
+               if (char != '/' && char != '\\') {
+                 state = AUTHORITY;
+                 continue;
+               } break;
+
+             case AUTHORITY:
+               if (char == '@') {
+                 if (seenAt) buffer = '%40' + buffer;
+                 seenAt = true;
+                 bufferCodePoints = arrayFrom(buffer);
+                 for (var i = 0; i < bufferCodePoints.length; i++) {
+                   var codePoint = bufferCodePoints[i];
+                   if (codePoint == ':' && !seenPasswordToken) {
+                     seenPasswordToken = true;
+                     continue;
+                   }
+                   var encodedCodePoints = percentEncode(codePoint, userinfoPercentEncodeSet);
+                   if (seenPasswordToken) url.password += encodedCodePoints;
+                   else url.username += encodedCodePoints;
+                 }
+                 buffer = '';
+               } else if (
+                 char == EOF || char == '/' || char == '?' || char == '#' ||
+                 (char == '\\' && isSpecial(url))
+               ) {
+                 if (seenAt && buffer == '') return INVALID_AUTHORITY;
+                 pointer -= arrayFrom(buffer).length + 1;
+                 buffer = '';
+                 state = HOST;
+               } else buffer += char;
+               break;
+
+             case HOST:
+             case HOSTNAME:
+               if (stateOverride && url.scheme == 'file') {
+                 state = FILE_HOST;
+                 continue;
+               } else if (char == ':' && !seenBracket) {
+                 if (buffer == '') return INVALID_HOST;
+                 failure = parseHost(url, buffer);
+                 if (failure) return failure;
+                 buffer = '';
+                 state = PORT;
+                 if (stateOverride == HOSTNAME) return;
+               } else if (
+                 char == EOF || char == '/' || char == '?' || char == '#' ||
+                 (char == '\\' && isSpecial(url))
+               ) {
+                 if (isSpecial(url) && buffer == '') return INVALID_HOST;
+                 if (stateOverride && buffer == '' && (includesCredentials(url) || url.port !== null)) return;
+                 failure = parseHost(url, buffer);
+                 if (failure) return failure;
+                 buffer = '';
+                 state = PATH_START;
+                 if (stateOverride) return;
+                 continue;
+               } else {
+                 if (char == '[') seenBracket = true;
+                 else if (char == ']') seenBracket = false;
+                 buffer += char;
+               } break;
+
+             case PORT:
+               if (DIGIT.test(char)) {
+                 buffer += char;
+               } else if (
+                 char == EOF || char == '/' || char == '?' || char == '#' ||
+                 (char == '\\' && isSpecial(url)) ||
+                 stateOverride
+               ) {
+                 if (buffer != '') {
+                   var port = parseInt(buffer, 10);
+                   if (port > 0xFFFF) return INVALID_PORT;
+                   url.port = (isSpecial(url) && port === specialSchemes[url.scheme]) ? null : port;
+                   buffer = '';
+                 }
+                 if (stateOverride) return;
+                 state = PATH_START;
+                 continue;
+               } else return INVALID_PORT;
+               break;
+
+             case FILE:
+               url.scheme = 'file';
+               if (char == '/' || char == '\\') state = FILE_SLASH;
+               else if (base && base.scheme == 'file') {
+                 if (char == EOF) {
+                   url.host = base.host;
+                   url.path = base.path.slice();
+                   url.query = base.query;
+                 } else if (char == '?') {
+                   url.host = base.host;
+                   url.path = base.path.slice();
+                   url.query = '';
+                   state = QUERY;
+                 } else if (char == '#') {
+                   url.host = base.host;
+                   url.path = base.path.slice();
+                   url.query = base.query;
+                   url.fragment = '';
+                   state = FRAGMENT;
+                 } else {
+                   if (!startsWithWindowsDriveLetter(codePoints.slice(pointer).join(''))) {
+                     url.host = base.host;
+                     url.path = base.path.slice();
+                     shortenURLsPath(url);
+                   }
+                   state = PATH;
+                   continue;
+                 }
+               } else {
+                 state = PATH;
+                 continue;
+               } break;
+
+             case FILE_SLASH:
+               if (char == '/' || char == '\\') {
+                 state = FILE_HOST;
+                 break;
+               }
+               if (base && base.scheme == 'file' && !startsWithWindowsDriveLetter(codePoints.slice(pointer).join(''))) {
+                 if (isWindowsDriveLetter(base.path[0], true)) url.path.push(base.path[0]);
+                 else url.host = base.host;
+               }
+               state = PATH;
+               continue;
+
+             case FILE_HOST:
+               if (char == EOF || char == '/' || char == '\\' || char == '?' || char == '#') {
+                 if (!stateOverride && isWindowsDriveLetter(buffer)) {
+                   state = PATH;
+                 } else if (buffer == '') {
+                   url.host = '';
+                   if (stateOverride) return;
+                   state = PATH_START;
+                 } else {
+                   failure = parseHost(url, buffer);
+                   if (failure) return failure;
+                   if (url.host == 'localhost') url.host = '';
+                   if (stateOverride) return;
+                   buffer = '';
+                   state = PATH_START;
+                 } continue;
+               } else buffer += char;
+               break;
+
+             case PATH_START:
+               if (isSpecial(url)) {
+                 state = PATH;
+                 if (char != '/' && char != '\\') continue;
+               } else if (!stateOverride && char == '?') {
+                 url.query = '';
+                 state = QUERY;
+               } else if (!stateOverride && char == '#') {
+                 url.fragment = '';
+                 state = FRAGMENT;
+               } else if (char != EOF) {
+                 state = PATH;
+                 if (char != '/') continue;
+               } break;
+
+             case PATH:
+               if (
+                 char == EOF || char == '/' ||
+                 (char == '\\' && isSpecial(url)) ||
+                 (!stateOverride && (char == '?' || char == '#'))
+               ) {
+                 if (isDoubleDot(buffer)) {
+                   shortenURLsPath(url);
+                   if (char != '/' && !(char == '\\' && isSpecial(url))) {
+                     url.path.push('');
+                   }
+                 } else if (isSingleDot(buffer)) {
+                   if (char != '/' && !(char == '\\' && isSpecial(url))) {
+                     url.path.push('');
+                   }
+                 } else {
+                   if (url.scheme == 'file' && !url.path.length && isWindowsDriveLetter(buffer)) {
+                     if (url.host) url.host = '';
+                     buffer = buffer.charAt(0) + ':'; // normalize windows drive letter
+                   }
+                   url.path.push(buffer);
+                 }
+                 buffer = '';
+                 if (url.scheme == 'file' && (char == EOF || char == '?' || char == '#')) {
+                   while (url.path.length > 1 && url.path[0] === '') {
+                     url.path.shift();
+                   }
+                 }
+                 if (char == '?') {
+                   url.query = '';
+                   state = QUERY;
+                 } else if (char == '#') {
+                   url.fragment = '';
+                   state = FRAGMENT;
+                 }
+               } else {
+                 buffer += percentEncode(char, pathPercentEncodeSet);
+               } break;
+
+             case CANNOT_BE_A_BASE_URL_PATH:
+               if (char == '?') {
+                 url.query = '';
+                 state = QUERY;
+               } else if (char == '#') {
+                 url.fragment = '';
+                 state = FRAGMENT;
+               } else if (char != EOF) {
+                 url.path[0] += percentEncode(char, C0ControlPercentEncodeSet);
+               } break;
+
+             case QUERY:
+               if (!stateOverride && char == '#') {
+                 url.fragment = '';
+                 state = FRAGMENT;
+               } else if (char != EOF) {
+                 if (char == "'" && isSpecial(url)) url.query += '%27';
+                 else if (char == '#') url.query += '%23';
+                 else url.query += percentEncode(char, C0ControlPercentEncodeSet);
+               } break;
+
+             case FRAGMENT:
+               if (char != EOF) url.fragment += percentEncode(char, fragmentPercentEncodeSet);
+               break;
+           }
+
+           pointer++;
+         }
+       };
+
+       // `URL` constructor
+       // https://url.spec.whatwg.org/#url-class
+       var URLConstructor = function URL(url /* , base */) {
+         var that = anInstance(this, URLConstructor, 'URL');
+         var base = arguments.length > 1 ? arguments[1] : undefined;
+         var urlString = String(url);
+         var state = setInternalState$6(that, { type: 'URL' });
+         var baseState, failure;
+         if (base !== undefined) {
+           if (base instanceof URLConstructor) baseState = getInternalURLState(base);
+           else {
+             failure = parseURL(baseState = {}, String(base));
+             if (failure) throw TypeError(failure);
+           }
+         }
+         failure = parseURL(state, urlString, null, baseState);
+         if (failure) throw TypeError(failure);
+         var searchParams = state.searchParams = new URLSearchParams$1();
+         var searchParamsState = getInternalSearchParamsState(searchParams);
+         searchParamsState.updateSearchParams(state.query);
+         searchParamsState.updateURL = function () {
+           state.query = String(searchParams) || null;
+         };
+         if (!descriptors) {
+           that.href = serializeURL.call(that);
+           that.origin = getOrigin.call(that);
+           that.protocol = getProtocol.call(that);
+           that.username = getUsername.call(that);
+           that.password = getPassword.call(that);
+           that.host = getHost.call(that);
+           that.hostname = getHostname.call(that);
+           that.port = getPort.call(that);
+           that.pathname = getPathname.call(that);
+           that.search = getSearch.call(that);
+           that.searchParams = getSearchParams.call(that);
+           that.hash = getHash.call(that);
+         }
+       };
+
+       var URLPrototype = URLConstructor.prototype;
+
+       var serializeURL = function () {
+         var url = getInternalURLState(this);
+         var scheme = url.scheme;
+         var username = url.username;
+         var password = url.password;
+         var host = url.host;
+         var port = url.port;
+         var path = url.path;
+         var query = url.query;
+         var fragment = url.fragment;
+         var output = scheme + ':';
+         if (host !== null) {
+           output += '//';
+           if (includesCredentials(url)) {
+             output += username + (password ? ':' + password : '') + '@';
+           }
+           output += serializeHost(host);
+           if (port !== null) output += ':' + port;
+         } else if (scheme == 'file') output += '//';
+         output += url.cannotBeABaseURL ? path[0] : path.length ? '/' + path.join('/') : '';
+         if (query !== null) output += '?' + query;
+         if (fragment !== null) output += '#' + fragment;
+         return output;
+       };
+
+       var getOrigin = function () {
+         var url = getInternalURLState(this);
+         var scheme = url.scheme;
+         var port = url.port;
+         if (scheme == 'blob') try {
+           return new URL(scheme.path[0]).origin;
+         } catch (error) {
+           return 'null';
+         }
+         if (scheme == 'file' || !isSpecial(url)) return 'null';
+         return scheme + '://' + serializeHost(url.host) + (port !== null ? ':' + port : '');
+       };
+
+       var getProtocol = function () {
+         return getInternalURLState(this).scheme + ':';
+       };
+
+       var getUsername = function () {
+         return getInternalURLState(this).username;
+       };
+
+       var getPassword = function () {
+         return getInternalURLState(this).password;
+       };
+
+       var getHost = function () {
+         var url = getInternalURLState(this);
+         var host = url.host;
+         var port = url.port;
+         return host === null ? ''
+           : port === null ? serializeHost(host)
+           : serializeHost(host) + ':' + port;
+       };
+
+       var getHostname = function () {
+         var host = getInternalURLState(this).host;
+         return host === null ? '' : serializeHost(host);
+       };
+
+       var getPort = function () {
+         var port = getInternalURLState(this).port;
+         return port === null ? '' : String(port);
+       };
+
+       var getPathname = function () {
+         var url = getInternalURLState(this);
+         var path = url.path;
+         return url.cannotBeABaseURL ? path[0] : path.length ? '/' + path.join('/') : '';
+       };
+
+       var getSearch = function () {
+         var query = getInternalURLState(this).query;
+         return query ? '?' + query : '';
+       };
+
+       var getSearchParams = function () {
+         return getInternalURLState(this).searchParams;
+       };
+
+       var getHash = function () {
+         var fragment = getInternalURLState(this).fragment;
+         return fragment ? '#' + fragment : '';
+       };
+
+       var accessorDescriptor = function (getter, setter) {
+         return { get: getter, set: setter, configurable: true, enumerable: true };
+       };
+
+       if (descriptors) {
+         objectDefineProperties(URLPrototype, {
+           // `URL.prototype.href` accessors pair
+           // https://url.spec.whatwg.org/#dom-url-href
+           href: accessorDescriptor(serializeURL, function (href) {
+             var url = getInternalURLState(this);
+             var urlString = String(href);
+             var failure = parseURL(url, urlString);
+             if (failure) throw TypeError(failure);
+             getInternalSearchParamsState(url.searchParams).updateSearchParams(url.query);
+           }),
+           // `URL.prototype.origin` getter
+           // https://url.spec.whatwg.org/#dom-url-origin
+           origin: accessorDescriptor(getOrigin),
+           // `URL.prototype.protocol` accessors pair
+           // https://url.spec.whatwg.org/#dom-url-protocol
+           protocol: accessorDescriptor(getProtocol, function (protocol) {
+             var url = getInternalURLState(this);
+             parseURL(url, String(protocol) + ':', SCHEME_START);
+           }),
+           // `URL.prototype.username` accessors pair
+           // https://url.spec.whatwg.org/#dom-url-username
+           username: accessorDescriptor(getUsername, function (username) {
+             var url = getInternalURLState(this);
+             var codePoints = arrayFrom(String(username));
+             if (cannotHaveUsernamePasswordPort(url)) return;
+             url.username = '';
+             for (var i = 0; i < codePoints.length; i++) {
+               url.username += percentEncode(codePoints[i], userinfoPercentEncodeSet);
+             }
+           }),
+           // `URL.prototype.password` accessors pair
+           // https://url.spec.whatwg.org/#dom-url-password
+           password: accessorDescriptor(getPassword, function (password) {
+             var url = getInternalURLState(this);
+             var codePoints = arrayFrom(String(password));
+             if (cannotHaveUsernamePasswordPort(url)) return;
+             url.password = '';
+             for (var i = 0; i < codePoints.length; i++) {
+               url.password += percentEncode(codePoints[i], userinfoPercentEncodeSet);
+             }
+           }),
+           // `URL.prototype.host` accessors pair
+           // https://url.spec.whatwg.org/#dom-url-host
+           host: accessorDescriptor(getHost, function (host) {
+             var url = getInternalURLState(this);
+             if (url.cannotBeABaseURL) return;
+             parseURL(url, String(host), HOST);
+           }),
+           // `URL.prototype.hostname` accessors pair
+           // https://url.spec.whatwg.org/#dom-url-hostname
+           hostname: accessorDescriptor(getHostname, function (hostname) {
+             var url = getInternalURLState(this);
+             if (url.cannotBeABaseURL) return;
+             parseURL(url, String(hostname), HOSTNAME);
+           }),
+           // `URL.prototype.port` accessors pair
+           // https://url.spec.whatwg.org/#dom-url-port
+           port: accessorDescriptor(getPort, function (port) {
+             var url = getInternalURLState(this);
+             if (cannotHaveUsernamePasswordPort(url)) return;
+             port = String(port);
+             if (port == '') url.port = null;
+             else parseURL(url, port, PORT);
+           }),
+           // `URL.prototype.pathname` accessors pair
+           // https://url.spec.whatwg.org/#dom-url-pathname
+           pathname: accessorDescriptor(getPathname, function (pathname) {
+             var url = getInternalURLState(this);
+             if (url.cannotBeABaseURL) return;
+             url.path = [];
+             parseURL(url, pathname + '', PATH_START);
+           }),
+           // `URL.prototype.search` accessors pair
+           // https://url.spec.whatwg.org/#dom-url-search
+           search: accessorDescriptor(getSearch, function (search) {
+             var url = getInternalURLState(this);
+             search = String(search);
+             if (search == '') {
+               url.query = null;
+             } else {
+               if ('?' == search.charAt(0)) search = search.slice(1);
+               url.query = '';
+               parseURL(url, search, QUERY);
+             }
+             getInternalSearchParamsState(url.searchParams).updateSearchParams(url.query);
+           }),
+           // `URL.prototype.searchParams` getter
+           // https://url.spec.whatwg.org/#dom-url-searchparams
+           searchParams: accessorDescriptor(getSearchParams),
+           // `URL.prototype.hash` accessors pair
+           // https://url.spec.whatwg.org/#dom-url-hash
+           hash: accessorDescriptor(getHash, function (hash) {
+             var url = getInternalURLState(this);
+             hash = String(hash);
+             if (hash == '') {
+               url.fragment = null;
+               return;
+             }
+             if ('#' == hash.charAt(0)) hash = hash.slice(1);
+             url.fragment = '';
+             parseURL(url, hash, FRAGMENT);
+           })
+         });
+       }
+
+       // `URL.prototype.toJSON` method
+       // https://url.spec.whatwg.org/#dom-url-tojson
+       redefine(URLPrototype, 'toJSON', function toJSON() {
+         return serializeURL.call(this);
+       }, { enumerable: true });
+
+       // `URL.prototype.toString` method
+       // https://url.spec.whatwg.org/#URL-stringification-behavior
+       redefine(URLPrototype, 'toString', function toString() {
+         return serializeURL.call(this);
+       }, { enumerable: true });
+
+       if (NativeURL) {
+         var nativeCreateObjectURL = NativeURL.createObjectURL;
+         var nativeRevokeObjectURL = NativeURL.revokeObjectURL;
+         // `URL.createObjectURL` method
+         // https://developer.mozilla.org/en-US/docs/Web/API/URL/createObjectURL
+         // eslint-disable-next-line no-unused-vars
+         if (nativeCreateObjectURL) redefine(URLConstructor, 'createObjectURL', function createObjectURL(blob) {
+           return nativeCreateObjectURL.apply(NativeURL, arguments);
+         });
+         // `URL.revokeObjectURL` method
+         // https://developer.mozilla.org/en-US/docs/Web/API/URL/revokeObjectURL
+         // eslint-disable-next-line no-unused-vars
+         if (nativeRevokeObjectURL) redefine(URLConstructor, 'revokeObjectURL', function revokeObjectURL(url) {
+           return nativeRevokeObjectURL.apply(NativeURL, arguments);
+         });
+       }
+
+       setToStringTag(URLConstructor, 'URL');
+
+       _export({ global: true, forced: !nativeUrl, sham: !descriptors }, {
+         URL: URLConstructor
+       });
+
+       function _typeof(obj) {
+         "@babel/helpers - typeof";
+
+         if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") {
+           _typeof = function (obj) {
+             return typeof obj;
+           };
+         } else {
+           _typeof = function (obj) {
+             return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
+           };
+         }
+
+         return _typeof(obj);
+       }
+
+       function _classCallCheck(instance, Constructor) {
+         if (!(instance instanceof Constructor)) {
+           throw new TypeError("Cannot call a class as a function");
+         }
+       }
+
+       function _defineProperties(target, props) {
+         for (var i = 0; i < props.length; i++) {
+           var descriptor = props[i];
+           descriptor.enumerable = descriptor.enumerable || false;
+           descriptor.configurable = true;
+           if ("value" in descriptor) descriptor.writable = true;
+           Object.defineProperty(target, descriptor.key, descriptor);
+         }
+       }
+
+       function _createClass(Constructor, protoProps, staticProps) {
+         if (protoProps) _defineProperties(Constructor.prototype, protoProps);
+         if (staticProps) _defineProperties(Constructor, staticProps);
+         return Constructor;
+       }
+
+       function _defineProperty(obj, key, value) {
+         if (key in obj) {
+           Object.defineProperty(obj, key, {
+             value: value,
+             enumerable: true,
+             configurable: true,
+             writable: true
+           });
+         } else {
+           obj[key] = value;
+         }
+
+         return obj;
+       }
+
+       function _slicedToArray(arr, i) {
+         return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest();
+       }
+
+       function _toConsumableArray(arr) {
+         return _arrayWithoutHoles(arr) || _iterableToArray(arr) || _unsupportedIterableToArray(arr) || _nonIterableSpread();
+       }
+
+       function _arrayWithoutHoles(arr) {
+         if (Array.isArray(arr)) return _arrayLikeToArray(arr);
+       }
+
+       function _arrayWithHoles(arr) {
+         if (Array.isArray(arr)) return arr;
+       }
+
+       function _iterableToArray(iter) {
+         if (typeof Symbol !== "undefined" && Symbol.iterator in Object(iter)) return Array.from(iter);
+       }
+
+       function _iterableToArrayLimit(arr, i) {
+         if (typeof Symbol === "undefined" || !(Symbol.iterator in Object(arr))) return;
+         var _arr = [];
+         var _n = true;
+         var _d = false;
+         var _e = undefined;
+
+         try {
+           for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {
+             _arr.push(_s.value);
+
+             if (i && _arr.length === i) break;
+           }
+         } catch (err) {
+           _d = true;
+           _e = err;
+         } finally {
+           try {
+             if (!_n && _i["return"] != null) _i["return"]();
+           } finally {
+             if (_d) throw _e;
+           }
+         }
+
+         return _arr;
+       }
+
+       function _unsupportedIterableToArray(o, minLen) {
+         if (!o) return;
+         if (typeof o === "string") return _arrayLikeToArray(o, minLen);
+         var n = Object.prototype.toString.call(o).slice(8, -1);
+         if (n === "Object" && o.constructor) n = o.constructor.name;
+         if (n === "Map" || n === "Set") return Array.from(o);
+         if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen);
+       }
+
+       function _arrayLikeToArray(arr, len) {
+         if (len == null || len > arr.length) len = arr.length;
+
+         for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i];
+
+         return arr2;
+       }
+
+       function _nonIterableSpread() {
+         throw new TypeError("Invalid attempt to spread non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
+       }
+
+       function _nonIterableRest() {
+         throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
+       }
+
+       function _createForOfIteratorHelper(o, allowArrayLike) {
+         var it;
+
+         if (typeof Symbol === "undefined" || o[Symbol.iterator] == null) {
+           if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") {
+             if (it) o = it;
+             var i = 0;
+
+             var F = function () {};
+
+             return {
+               s: F,
+               n: function () {
+                 if (i >= o.length) return {
+                   done: true
+                 };
+                 return {
+                   done: false,
+                   value: o[i++]
+                 };
+               },
+               e: function (e) {
+                 throw e;
+               },
+               f: F
+             };
+           }
+
+           throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.");
+         }
+
+         var normalCompletion = true,
+             didErr = false,
+             err;
+         return {
+           s: function () {
+             it = o[Symbol.iterator]();
+           },
+           n: function () {
+             var step = it.next();
+             normalCompletion = step.done;
+             return step;
+           },
+           e: function (e) {
+             didErr = true;
+             err = e;
+           },
+           f: function () {
+             try {
+               if (!normalCompletion && it.return != null) it.return();
+             } finally {
+               if (didErr) throw err;
+             }
+           }
+         };
+       }
+
+       var global$1 = typeof globalThis !== 'undefined' && globalThis || typeof self !== 'undefined' && self || typeof global$1 !== 'undefined' && global$1;
+       var support = {
+         searchParams: 'URLSearchParams' in global$1,
+         iterable: 'Symbol' in global$1 && 'iterator' in Symbol,
+         blob: 'FileReader' in global$1 && 'Blob' in global$1 && function () {
+           try {
+             new Blob();
+             return true;
+           } catch (e) {
+             return false;
+           }
+         }(),
+         formData: 'FormData' in global$1,
+         arrayBuffer: 'ArrayBuffer' in global$1
+       };
+
+       function isDataView(obj) {
+         return obj && DataView.prototype.isPrototypeOf(obj);
+       }
+
+       if (support.arrayBuffer) {
+         var viewClasses = ['[object Int8Array]', '[object Uint8Array]', '[object Uint8ClampedArray]', '[object Int16Array]', '[object Uint16Array]', '[object Int32Array]', '[object Uint32Array]', '[object Float32Array]', '[object Float64Array]'];
+
+         var isArrayBufferView = ArrayBuffer.isView || function (obj) {
+           return obj && viewClasses.indexOf(Object.prototype.toString.call(obj)) > -1;
+         };
+       }
+
+       function normalizeName(name) {
+         if (typeof name !== 'string') {
+           name = String(name);
+         }
+
+         if (/[^a-z0-9\-#$%&'*+.^_`|~!]/i.test(name) || name === '') {
+           throw new TypeError('Invalid character in header field name');
+         }
+
+         return name.toLowerCase();
+       }
+
+       function normalizeValue(value) {
+         if (typeof value !== 'string') {
+           value = String(value);
+         }
+
+         return value;
+       } // Build a destructive iterator for the value list
+
+
+       function iteratorFor(items) {
+         var iterator = {
+           next: function next() {
+             var value = items.shift();
+             return {
+               done: value === undefined,
+               value: value
+             };
+           }
+         };
+
+         if (support.iterable) {
+           iterator[Symbol.iterator] = function () {
+             return iterator;
+           };
+         }
+
+         return iterator;
+       }
+
+       function Headers$1(headers) {
+         this.map = {};
+
+         if (headers instanceof Headers$1) {
+           headers.forEach(function (value, name) {
+             this.append(name, value);
+           }, this);
+         } else if (Array.isArray(headers)) {
+           headers.forEach(function (header) {
+             this.append(header[0], header[1]);
+           }, this);
+         } else if (headers) {
+           Object.getOwnPropertyNames(headers).forEach(function (name) {
+             this.append(name, headers[name]);
+           }, this);
+         }
+       }
+
+       Headers$1.prototype.append = function (name, value) {
+         name = normalizeName(name);
+         value = normalizeValue(value);
+         var oldValue = this.map[name];
+         this.map[name] = oldValue ? oldValue + ', ' + value : value;
+       };
+
+       Headers$1.prototype['delete'] = function (name) {
+         delete this.map[normalizeName(name)];
+       };
+
+       Headers$1.prototype.get = function (name) {
+         name = normalizeName(name);
+         return this.has(name) ? this.map[name] : null;
+       };
+
+       Headers$1.prototype.has = function (name) {
+         return this.map.hasOwnProperty(normalizeName(name));
+       };
+
+       Headers$1.prototype.set = function (name, value) {
+         this.map[normalizeName(name)] = normalizeValue(value);
+       };
+
+       Headers$1.prototype.forEach = function (callback, thisArg) {
+         for (var name in this.map) {
+           if (this.map.hasOwnProperty(name)) {
+             callback.call(thisArg, this.map[name], name, this);
+           }
+         }
+       };
+
+       Headers$1.prototype.keys = function () {
+         var items = [];
+         this.forEach(function (value, name) {
+           items.push(name);
+         });
+         return iteratorFor(items);
+       };
+
+       Headers$1.prototype.values = function () {
+         var items = [];
+         this.forEach(function (value) {
+           items.push(value);
+         });
+         return iteratorFor(items);
+       };
+
+       Headers$1.prototype.entries = function () {
+         var items = [];
+         this.forEach(function (value, name) {
+           items.push([name, value]);
+         });
+         return iteratorFor(items);
+       };
+
+       if (support.iterable) {
+         Headers$1.prototype[Symbol.iterator] = Headers$1.prototype.entries;
+       }
+
+       function consumed(body) {
+         if (body.bodyUsed) {
+           return Promise.reject(new TypeError('Already read'));
+         }
+
+         body.bodyUsed = true;
        }
 
        function fileReaderReady(reader) {
-         return new Promise(function(resolve, reject) {
-           reader.onload = function() {
+         return new Promise(function (resolve, reject) {
+           reader.onload = function () {
              resolve(reader.result);
            };
-           reader.onerror = function() {
+
+           reader.onerror = function () {
              reject(reader.error);
            };
-         })
+         });
        }
 
        function readBlobAsArrayBuffer(blob) {
          var reader = new FileReader();
          var promise = fileReaderReady(reader);
          reader.readAsArrayBuffer(blob);
-         return promise
+         return promise;
        }
 
        function readBlobAsText(blob) {
          var reader = new FileReader();
          var promise = fileReaderReady(reader);
          reader.readAsText(blob);
-         return promise
+         return promise;
        }
 
        function readArrayBufferAsText(buf) {
          for (var i = 0; i < view.length; i++) {
            chars[i] = String.fromCharCode(view[i]);
          }
-         return chars.join('')
+
+         return chars.join('');
        }
 
        function bufferClone(buf) {
          if (buf.slice) {
-           return buf.slice(0)
+           return buf.slice(0);
          } else {
            var view = new Uint8Array(buf.byteLength);
            view.set(new Uint8Array(buf));
-           return view.buffer
+           return view.buffer;
          }
        }
 
        function Body() {
          this.bodyUsed = false;
 
-         this._initBody = function(body) {
+         this._initBody = function (body) {
            /*
              fetch-mock wraps the Response object in an ES6 Proxy to
              provide useful test harness features such as flush. However, on
            */
            this.bodyUsed = this.bodyUsed;
            this._bodyInit = body;
+
            if (!body) {
              this._bodyText = '';
            } else if (typeof body === 'string') {
            } else if (support.searchParams && URLSearchParams.prototype.isPrototypeOf(body)) {
              this._bodyText = body.toString();
            } else if (support.arrayBuffer && support.blob && isDataView(body)) {
-             this._bodyArrayBuffer = bufferClone(body.buffer);
-             // IE 10-11 can't handle a DataView body.
+             this._bodyArrayBuffer = bufferClone(body.buffer); // IE 10-11 can't handle a DataView body.
+
              this._bodyInit = new Blob([this._bodyArrayBuffer]);
            } else if (support.arrayBuffer && (ArrayBuffer.prototype.isPrototypeOf(body) || isArrayBufferView(body))) {
              this._bodyArrayBuffer = bufferClone(body);
          };
 
          if (support.blob) {
-           this.blob = function() {
+           this.blob = function () {
              var rejected = consumed(this);
+
              if (rejected) {
-               return rejected
+               return rejected;
              }
 
              if (this._bodyBlob) {
-               return Promise.resolve(this._bodyBlob)
+               return Promise.resolve(this._bodyBlob);
              } else if (this._bodyArrayBuffer) {
-               return Promise.resolve(new Blob([this._bodyArrayBuffer]))
+               return Promise.resolve(new Blob([this._bodyArrayBuffer]));
              } else if (this._bodyFormData) {
-               throw new Error('could not read FormData body as blob')
+               throw new Error('could not read FormData body as blob');
              } else {
-               return Promise.resolve(new Blob([this._bodyText]))
+               return Promise.resolve(new Blob([this._bodyText]));
              }
            };
 
-           this.arrayBuffer = function() {
+           this.arrayBuffer = function () {
              if (this._bodyArrayBuffer) {
-               return consumed(this) || Promise.resolve(this._bodyArrayBuffer)
+               var isConsumed = consumed(this);
+
+               if (isConsumed) {
+                 return isConsumed;
+               }
+
+               if (ArrayBuffer.isView(this._bodyArrayBuffer)) {
+                 return Promise.resolve(this._bodyArrayBuffer.buffer.slice(this._bodyArrayBuffer.byteOffset, this._bodyArrayBuffer.byteOffset + this._bodyArrayBuffer.byteLength));
+               } else {
+                 return Promise.resolve(this._bodyArrayBuffer);
+               }
              } else {
-               return this.blob().then(readBlobAsArrayBuffer)
+               return this.blob().then(readBlobAsArrayBuffer);
              }
            };
          }
 
-         this.text = function() {
+         this.text = function () {
            var rejected = consumed(this);
+
            if (rejected) {
-             return rejected
+             return rejected;
            }
 
            if (this._bodyBlob) {
-             return readBlobAsText(this._bodyBlob)
+             return readBlobAsText(this._bodyBlob);
            } else if (this._bodyArrayBuffer) {
-             return Promise.resolve(readArrayBufferAsText(this._bodyArrayBuffer))
+             return Promise.resolve(readArrayBufferAsText(this._bodyArrayBuffer));
            } else if (this._bodyFormData) {
-             throw new Error('could not read FormData body as text')
+             throw new Error('could not read FormData body as text');
            } else {
-             return Promise.resolve(this._bodyText)
+             return Promise.resolve(this._bodyText);
            }
          };
 
          if (support.formData) {
-           this.formData = function() {
-             return this.text().then(decode)
+           this.formData = function () {
+             return this.text().then(decode);
            };
          }
 
-         this.json = function() {
-           return this.text().then(JSON.parse)
+         this.json = function () {
+           return this.text().then(JSON.parse);
          };
 
-         return this
-       }
+         return this;
+       } // HTTP methods whose capitalization should be normalized
+
 
-       // HTTP methods whose capitalization should be normalized
        var methods = ['DELETE', 'GET', 'HEAD', 'OPTIONS', 'POST', 'PUT'];
 
        function normalizeMethod(method) {
          var upcased = method.toUpperCase();
-         return methods.indexOf(upcased) > -1 ? upcased : method
+         return methods.indexOf(upcased) > -1 ? upcased : method;
        }
 
        function Request(input, options) {
+         if (!(this instanceof Request)) {
+           throw new TypeError('Please use the "new" operator, this DOM object constructor cannot be called as a function.');
+         }
+
          options = options || {};
          var body = options.body;
 
          if (input instanceof Request) {
            if (input.bodyUsed) {
-             throw new TypeError('Already read')
+             throw new TypeError('Already read');
            }
+
            this.url = input.url;
            this.credentials = input.credentials;
+
            if (!options.headers) {
-             this.headers = new Headers(input.headers);
+             this.headers = new Headers$1(input.headers);
            }
+
            this.method = input.method;
            this.mode = input.mode;
            this.signal = input.signal;
+
            if (!body && input._bodyInit != null) {
              body = input._bodyInit;
              input.bodyUsed = true;
          }
 
          this.credentials = options.credentials || this.credentials || 'same-origin';
+
          if (options.headers || !this.headers) {
-           this.headers = new Headers(options.headers);
+           this.headers = new Headers$1(options.headers);
          }
+
          this.method = normalizeMethod(options.method || this.method || 'GET');
          this.mode = options.mode || this.mode || null;
          this.signal = options.signal || this.signal;
          this.referrer = null;
 
          if ((this.method === 'GET' || this.method === 'HEAD') && body) {
-           throw new TypeError('Body not allowed for GET or HEAD requests')
+           throw new TypeError('Body not allowed for GET or HEAD requests');
          }
+
          this._initBody(body);
 
          if (this.method === 'GET' || this.method === 'HEAD') {
            if (options.cache === 'no-store' || options.cache === 'no-cache') {
              // Search for a '_' parameter in the query string
              var reParamSearch = /([?&])_=[^&]*/;
+
              if (reParamSearch.test(this.url)) {
                // If it already exists then set the value with the current time
                this.url = this.url.replace(reParamSearch, '$1_=' + new Date().getTime());
          }
        }
 
-       Request.prototype.clone = function() {
-         return new Request(this, {body: this._bodyInit})
+       Request.prototype.clone = function () {
+         return new Request(this, {
+           body: this._bodyInit
+         });
        };
 
        function decode(body) {
          var form = new FormData();
-         body
-           .trim()
-           .split('&')
-           .forEach(function(bytes) {
-             if (bytes) {
-               var split = bytes.split('=');
-               var name = split.shift().replace(/\+/g, ' ');
-               var value = split.join('=').replace(/\+/g, ' ');
-               form.append(decodeURIComponent(name), decodeURIComponent(value));
-             }
-           });
-         return form
+         body.trim().split('&').forEach(function (bytes) {
+           if (bytes) {
+             var split = bytes.split('=');
+             var name = split.shift().replace(/\+/g, ' ');
+             var value = split.join('=').replace(/\+/g, ' ');
+             form.append(decodeURIComponent(name), decodeURIComponent(value));
+           }
+         });
+         return form;
        }
 
        function parseHeaders(rawHeaders) {
-         var headers = new Headers();
-         // Replace instances of \r\n and \n followed by at least one space or horizontal tab with a space
+         var headers = new Headers$1(); // Replace instances of \r\n and \n followed by at least one space or horizontal tab with a space
          // https://tools.ietf.org/html/rfc7230#section-3.2
+
          var preProcessedHeaders = rawHeaders.replace(/\r?\n[\t ]+/g, ' ');
-         preProcessedHeaders.split(/\r?\n/).forEach(function(line) {
+         preProcessedHeaders.split(/\r?\n/).forEach(function (line) {
            var parts = line.split(':');
            var key = parts.shift().trim();
+
            if (key) {
              var value = parts.join(':').trim();
              headers.append(key, value);
            }
          });
-         return headers
+         return headers;
        }
 
        Body.call(Request.prototype);
-
        function Response(bodyInit, options) {
+         if (!(this instanceof Response)) {
+           throw new TypeError('Please use the "new" operator, this DOM object constructor cannot be called as a function.');
+         }
+
          if (!options) {
            options = {};
          }
          this.status = options.status === undefined ? 200 : options.status;
          this.ok = this.status >= 200 && this.status < 300;
          this.statusText = 'statusText' in options ? options.statusText : '';
-         this.headers = new Headers(options.headers);
+         this.headers = new Headers$1(options.headers);
          this.url = options.url || '';
+
          this._initBody(bodyInit);
        }
-
        Body.call(Response.prototype);
 
-       Response.prototype.clone = function() {
+       Response.prototype.clone = function () {
          return new Response(this._bodyInit, {
            status: this.status,
            statusText: this.statusText,
-           headers: new Headers(this.headers),
+           headers: new Headers$1(this.headers),
            url: this.url
-         })
+         });
        };
 
-       Response.error = function() {
-         var response = new Response(null, {status: 0, statusText: ''});
+       Response.error = function () {
+         var response = new Response(null, {
+           status: 0,
+           statusText: ''
+         });
          response.type = 'error';
-         return response
+         return response;
        };
 
        var redirectStatuses = [301, 302, 303, 307, 308];
 
-       Response.redirect = function(url, status) {
+       Response.redirect = function (url, status) {
          if (redirectStatuses.indexOf(status) === -1) {
-           throw new RangeError('Invalid status code')
+           throw new RangeError('Invalid status code');
          }
 
-         return new Response(null, {status: status, headers: {location: url}})
+         return new Response(null, {
+           status: status,
+           headers: {
+             location: url
+           }
+         });
        };
 
        var DOMException$1 = global$1.DOMException;
 
-       if (typeof DOMException$1 !== 'function') {
-         DOMException$1 = function(message, name) {
+       try {
+         new DOMException$1();
+       } catch (err) {
+         DOMException$1 = function DOMException(message, name) {
            this.message = message;
            this.name = name;
            var error = Error(message);
            this.stack = error.stack;
          };
+
          DOMException$1.prototype = Object.create(Error.prototype);
          DOMException$1.prototype.constructor = DOMException$1;
        }
 
        function fetch$1(input, init) {
-         return new Promise(function(resolve, reject) {
+         return new Promise(function (resolve, reject) {
            var request = new Request(input, init);
 
            if (request.signal && request.signal.aborted) {
-             return reject(new DOMException$1('Aborted', 'AbortError'))
+             return reject(new DOMException$1('Aborted', 'AbortError'));
            }
 
            var xhr = new XMLHttpRequest();
              xhr.abort();
            }
 
-           xhr.onload = function() {
+           xhr.onload = function () {
              var options = {
                status: xhr.status,
                statusText: xhr.statusText,
              };
              options.url = 'responseURL' in xhr ? xhr.responseURL : options.headers.get('X-Request-URL');
              var body = 'response' in xhr ? xhr.response : xhr.responseText;
-             setTimeout(function() {
+             setTimeout(function () {
                resolve(new Response(body, options));
              }, 0);
            };
 
-           xhr.onerror = function() {
-             setTimeout(function() {
+           xhr.onerror = function () {
+             setTimeout(function () {
                reject(new TypeError('Network request failed'));
              }, 0);
            };
 
-           xhr.ontimeout = function() {
-             setTimeout(function() {
+           xhr.ontimeout = function () {
+             setTimeout(function () {
                reject(new TypeError('Network request failed'));
              }, 0);
            };
 
-           xhr.onabort = function() {
-             setTimeout(function() {
+           xhr.onabort = function () {
+             setTimeout(function () {
                reject(new DOMException$1('Aborted', 'AbortError'));
              }, 0);
            };
 
            function fixUrl(url) {
              try {
-               return url === '' && global$1.location.href ? global$1.location.href : url
+               return url === '' && global$1.location.href ? global$1.location.href : url;
              } catch (e) {
-               return url
+               return url;
              }
            }
 
            if ('responseType' in xhr) {
              if (support.blob) {
                xhr.responseType = 'blob';
-             } else if (
-               support.arrayBuffer &&
-               request.headers.get('Content-Type') &&
-               request.headers.get('Content-Type').indexOf('application/octet-stream') !== -1
-             ) {
+             } else if (support.arrayBuffer && request.headers.get('Content-Type') && request.headers.get('Content-Type').indexOf('application/octet-stream') !== -1) {
                xhr.responseType = 'arraybuffer';
              }
            }
 
-           request.headers.forEach(function(value, name) {
-             xhr.setRequestHeader(name, value);
-           });
+           if (init && _typeof(init.headers) === 'object' && !(init.headers instanceof Headers$1)) {
+             Object.getOwnPropertyNames(init.headers).forEach(function (name) {
+               xhr.setRequestHeader(name, normalizeValue(init.headers[name]));
+             });
+           } else {
+             request.headers.forEach(function (value, name) {
+               xhr.setRequestHeader(name, value);
+             });
+           }
 
            if (request.signal) {
              request.signal.addEventListener('abort', abortXhr);
 
-             xhr.onreadystatechange = function() {
+             xhr.onreadystatechange = function () {
                // DONE (success or failure)
                if (xhr.readyState === 4) {
                  request.signal.removeEventListener('abort', abortXhr);
            }
 
            xhr.send(typeof request._bodyInit === 'undefined' ? null : request._bodyInit);
-         })
+         });
        }
-
        fetch$1.polyfill = true;
 
        if (!global$1.fetch) {
          global$1.fetch = fetch$1;
-         global$1.Headers = Headers;
+         global$1.Headers = Headers$1;
          global$1.Request = Request;
          global$1.Response = Response;
        }
 
-       var lib = createCommonjsModule(function (module, exports) {
-       Object.defineProperty(exports, "__esModule", { value: true });
+       // `Symbol.toStringTag` well-known symbol
+       // https://tc39.github.io/ecma262/#sec-symbol.tostringtag
+       defineWellKnownSymbol('toStringTag');
+
+       var HAS_SPECIES_SUPPORT$2 = arrayMethodHasSpeciesSupport('splice');
+       var USES_TO_LENGTH$5 = arrayMethodUsesToLength('splice', { ACCESSORS: true, 0: 0, 1: 2 });
+
+       var max$3 = Math.max;
+       var min$6 = Math.min;
+       var MAX_SAFE_INTEGER = 0x1FFFFFFFFFFFFF;
+       var MAXIMUM_ALLOWED_LENGTH_EXCEEDED = 'Maximum allowed length exceeded';
+
+       // `Array.prototype.splice` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.splice
+       // with adding support of @@species
+       _export({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT$2 || !USES_TO_LENGTH$5 }, {
+         splice: function splice(start, deleteCount /* , ...items */) {
+           var O = toObject(this);
+           var len = toLength(O.length);
+           var actualStart = toAbsoluteIndex(start, len);
+           var argumentsLength = arguments.length;
+           var insertCount, actualDeleteCount, A, k, from, to;
+           if (argumentsLength === 0) {
+             insertCount = actualDeleteCount = 0;
+           } else if (argumentsLength === 1) {
+             insertCount = 0;
+             actualDeleteCount = len - actualStart;
+           } else {
+             insertCount = argumentsLength - 2;
+             actualDeleteCount = min$6(max$3(toInteger(deleteCount), 0), len - actualStart);
+           }
+           if (len + insertCount - actualDeleteCount > MAX_SAFE_INTEGER) {
+             throw TypeError(MAXIMUM_ALLOWED_LENGTH_EXCEEDED);
+           }
+           A = arraySpeciesCreate(O, actualDeleteCount);
+           for (k = 0; k < actualDeleteCount; k++) {
+             from = actualStart + k;
+             if (from in O) createProperty(A, k, O[from]);
+           }
+           A.length = actualDeleteCount;
+           if (insertCount < actualDeleteCount) {
+             for (k = actualStart; k < len - actualDeleteCount; k++) {
+               from = k + actualDeleteCount;
+               to = k + insertCount;
+               if (from in O) O[to] = O[from];
+               else delete O[to];
+             }
+             for (k = len; k > len - actualDeleteCount + insertCount; k--) delete O[k - 1];
+           } else if (insertCount > actualDeleteCount) {
+             for (k = len - actualDeleteCount; k > actualStart; k--) {
+               from = k + actualDeleteCount - 1;
+               to = k + insertCount - 1;
+               if (from in O) O[to] = O[from];
+               else delete O[to];
+             }
+           }
+           for (k = 0; k < insertCount; k++) {
+             O[k + actualStart] = arguments[k + 2];
+           }
+           O.length = len - actualDeleteCount + insertCount;
+           return A;
+         }
+       });
 
+       // JSON[@@toStringTag] property
+       // https://tc39.github.io/ecma262/#sec-json-@@tostringtag
+       setToStringTag(global_1.JSON, 'JSON', true);
 
+       // Math[@@toStringTag] property
+       // https://tc39.github.io/ecma262/#sec-math-@@tostringtag
+       setToStringTag(Math, 'Math', true);
 
+       // `Object.defineProperty` method
+       // https://tc39.github.io/ecma262/#sec-object.defineproperty
+       _export({ target: 'Object', stat: true, forced: !descriptors, sham: !descriptors }, {
+         defineProperty: objectDefineProperty.f
+       });
 
+       var nativeGetOwnPropertyDescriptor$2 = objectGetOwnPropertyDescriptor.f;
 
 
+       var FAILS_ON_PRIMITIVES$1 = fails(function () { nativeGetOwnPropertyDescriptor$2(1); });
+       var FORCED$5 = !descriptors || FAILS_ON_PRIMITIVES$1;
 
+       // `Object.getOwnPropertyDescriptor` method
+       // https://tc39.github.io/ecma262/#sec-object.getownpropertydescriptor
+       _export({ target: 'Object', stat: true, forced: FORCED$5, sham: !descriptors }, {
+         getOwnPropertyDescriptor: function getOwnPropertyDescriptor(it, key) {
+           return nativeGetOwnPropertyDescriptor$2(toIndexedObject(it), key);
+         }
+       });
 
+       var FAILS_ON_PRIMITIVES$2 = fails(function () { objectGetPrototypeOf(1); });
 
+       // `Object.getPrototypeOf` method
+       // https://tc39.github.io/ecma262/#sec-object.getprototypeof
+       _export({ target: 'Object', stat: true, forced: FAILS_ON_PRIMITIVES$2, sham: !correctPrototypeGetter }, {
+         getPrototypeOf: function getPrototypeOf(it) {
+           return objectGetPrototypeOf(toObject(it));
+         }
+       });
 
-       if (!window.Set) {
-           window.Set = es6Set;
-       }
-       if (!window.Map) {
-           window.Map = es6Map;
-       }
-       if (!window.Promise) {
-           window.Promise = polyfill$e;
-           window.Promise._immediateFn = setAsap;
-       }
-       if (!Array.prototype.find) {
-           array_prototype_find.shim();
-       }
-       if (!Array.prototype.findIndex) {
-           array_prototype_findindex.shim();
-       }
-       if (!Array.from) {
-           array_from.shim();
-       }
-       if (!Object.values) {
-           object_values.shim();
-       }
-       if (!Object.assign) {
-           object_assign.shim();
-       }
-       if (!window.requestAnimationFrame || !window.cancelAnimationFrame) {
-           window.requestAnimationFrame = raf_1;
-           window.cancelAnimationFrame = raf_1.cancel;
-       }
-
-       var finalFetch = window.fetch;
-       var finalPromise = window.Promise;
-       window.fetch = function (input, init) {
-           try {
-               return finalFetch(input, init);
-           }
-           catch (error) {
-               return new finalPromise(function (_, reject) { return reject(error); });
-           }
-       };
+       // `Object.setPrototypeOf` method
+       // https://tc39.github.io/ecma262/#sec-object.setprototypeof
+       _export({ target: 'Object', stat: true }, {
+         setPrototypeOf: objectSetPrototypeOf
        });
 
-       var $Math$2 = GetIntrinsic('%Math%');
-
-       var $floor$1 = $Math$2.floor;
-       var $abs$1 = $Math$2.abs;
+       var slice$1 = [].slice;
+       var factories = {};
 
-
-
-
-       // https://www.ecma-international.org/ecma-262/6.0/#sec-isinteger
-
-       var IsInteger = function IsInteger(argument) {
-               if (typeof argument !== 'number' || _isNaN(argument) || !_isFinite(argument)) {
-                       return false;
-               }
-               var abs = $abs$1(argument);
-               return $floor$1(abs) === abs;
-       };
-
-       var ArrayPush = callBound('Array.prototype.push');
-       var StringFromCharCodeSpread = callBind.apply(String.fromCharCode, null);
-
-       var implementation$8 = function fromCodePoint(_ /* fromCodePoint.length is 1 */) {
-               var MAX_SIZE = 0x4000;
-               var codeUnits = [];
-               var highSurrogate;
-               var lowSurrogate;
-               var index = -1;
-               var length = arguments.length;
-               if (!length) {
-                       return '';
-               }
-               var result = '';
-               while (++index < length) {
-                       var codePoint = ToNumber$1(arguments[index]);
-                       if (
-                               !IsInteger(codePoint) ||
-                               codePoint < 0 || codePoint > 0x10FFFF // not a valid Unicode code point
-                       ) {
-                               throw RangeError('Invalid code point: ' + codePoint);
-                       }
-                       if (codePoint <= 0xFFFF) { // BMP code point
-                               ArrayPush(codeUnits, codePoint);
-                       } else { // Astral code point; split in surrogate halves
-                               // https://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
-                               codePoint -= 0x10000;
-                               highSurrogate = (codePoint >> 10) + 0xD800;
-                               lowSurrogate = (codePoint % 0x400) + 0xDC00;
-                               ArrayPush(codeUnits, highSurrogate, lowSurrogate);
-                       }
-                       if (index + 1 == length || codeUnits.length > MAX_SIZE) {
-                               result += StringFromCharCodeSpread(codeUnits);
-                               codeUnits.length = 0;
-                       }
-               }
-               return result;
+       var construct = function (C, argsLength, args) {
+         if (!(argsLength in factories)) {
+           for (var list = [], i = 0; i < argsLength; i++) list[i] = 'a[' + i + ']';
+           // eslint-disable-next-line no-new-func
+           factories[argsLength] = Function('C,a', 'return new C(' + list.join(',') + ')');
+         } return factories[argsLength](C, args);
        };
 
-       var polyfill$g = function getPolyfill() {
-               return String.fromCodePoint || implementation$8;
+       // `Function.prototype.bind` method implementation
+       // https://tc39.github.io/ecma262/#sec-function.prototype.bind
+       var functionBind = Function.bind || function bind(that /* , ...args */) {
+         var fn = aFunction$1(this);
+         var partArgs = slice$1.call(arguments, 1);
+         var boundFunction = function bound(/* args... */) {
+           var args = partArgs.concat(slice$1.call(arguments));
+           return this instanceof boundFunction ? construct(fn, args.length, args) : fn.apply(that, args);
+         };
+         if (isObject(fn.prototype)) boundFunction.prototype = fn.prototype;
+         return boundFunction;
        };
 
-       var shim$d = function shimFromCodePoint() {
-               var polyfill = polyfill$g();
-
-               if (String.fromCodePoint !== polyfill) {
-                       defineProperties_1(String, { fromCodePoint: polyfill });
-               }
-
-               return polyfill;
-       };
+       var nativeConstruct = getBuiltIn('Reflect', 'construct');
 
-       /*! https://mths.be/fromcodepoint v1.0.0 by @mathias */
+       // `Reflect.construct` method
+       // https://tc39.github.io/ecma262/#sec-reflect.construct
+       // MS Edge supports only 2 arguments and argumentsList argument is optional
+       // FF Nightly sets third argument as `new.target`, but does not create `this` from it
+       var NEW_TARGET_BUG = fails(function () {
+         function F() { /* empty */ }
+         return !(nativeConstruct(function () { /* empty */ }, [], F) instanceof F);
+       });
+       var ARGS_BUG = !fails(function () {
+         nativeConstruct(function () { /* empty */ });
+       });
+       var FORCED$6 = NEW_TARGET_BUG || ARGS_BUG;
+
+       _export({ target: 'Reflect', stat: true, forced: FORCED$6, sham: FORCED$6 }, {
+         construct: function construct(Target, args /* , newTarget */) {
+           aFunction$1(Target);
+           anObject(args);
+           var newTarget = arguments.length < 3 ? Target : aFunction$1(arguments[2]);
+           if (ARGS_BUG && !NEW_TARGET_BUG) return nativeConstruct(Target, args, newTarget);
+           if (Target == newTarget) {
+             // w/o altered newTarget, optimization for 0-4 arguments
+             switch (args.length) {
+               case 0: return new Target();
+               case 1: return new Target(args[0]);
+               case 2: return new Target(args[0], args[1]);
+               case 3: return new Target(args[0], args[1], args[2]);
+               case 4: return new Target(args[0], args[1], args[2], args[3]);
+             }
+             // w/o altered newTarget, lot of arguments case
+             var $args = [null];
+             $args.push.apply($args, args);
+             return new (functionBind.apply(Target, $args))();
+           }
+           // with altered newTarget, not support built-in constructors
+           var proto = newTarget.prototype;
+           var instance = objectCreate(isObject(proto) ? proto : Object.prototype);
+           var result = Function.apply.call(Target, instance, args);
+           return isObject(result) ? result : instance;
+         }
+       });
 
-       shim$d();
+       // `Reflect.get` method
+       // https://tc39.github.io/ecma262/#sec-reflect.get
+       function get$2(target, propertyKey /* , receiver */) {
+         var receiver = arguments.length < 3 ? target : arguments[2];
+         var descriptor, prototype;
+         if (anObject(target) === receiver) return target[propertyKey];
+         if (descriptor = objectGetOwnPropertyDescriptor.f(target, propertyKey)) return has(descriptor, 'value')
+           ? descriptor.value
+           : descriptor.get === undefined
+             ? undefined
+             : descriptor.get.call(receiver);
+         if (isObject(prototype = objectGetPrototypeOf(target))) return get$2(prototype, propertyKey, receiver);
+       }
+
+       _export({ target: 'Reflect', stat: true }, {
+         get: get$2
+       });
 
        (function (factory) {
-         
-         factory();
-       }((function () {
+          factory();
+       })(function () {
+
          function _classCallCheck(instance, Constructor) {
            if (!(instance instanceof Constructor)) {
              throw new TypeError("Cannot call a class as a function");
            return _setPrototypeOf(o, p);
          }
 
+         function _isNativeReflectConstruct() {
+           if (typeof Reflect === "undefined" || !Reflect.construct) return false;
+           if (Reflect.construct.sham) return false;
+           if (typeof Proxy === "function") return true;
+
+           try {
+             Date.prototype.toString.call(Reflect.construct(Date, [], function () {}));
+             return true;
+           } catch (e) {
+             return false;
+           }
+         }
+
          function _assertThisInitialized(self) {
            if (self === void 0) {
              throw new ReferenceError("this hasn't been initialised - super() hasn't been called");
          }
 
          function _possibleConstructorReturn(self, call) {
-           if (call && (typeof call === "object" || typeof call === "function")) {
+           if (call && (_typeof(call) === "object" || typeof call === "function")) {
              return call;
            }
 
            return _assertThisInitialized(self);
          }
 
+         function _createSuper(Derived) {
+           var hasNativeReflectConstruct = _isNativeReflectConstruct();
+
+           return function _createSuperInternal() {
+             var Super = _getPrototypeOf(Derived),
+                 result;
+
+             if (hasNativeReflectConstruct) {
+               var NewTarget = _getPrototypeOf(this).constructor;
+
+               result = Reflect.construct(Super, arguments, NewTarget);
+             } else {
+               result = Super.apply(this, arguments);
+             }
+
+             return _possibleConstructorReturn(this, result);
+           };
+         }
+
          function _superPropBase(object, property) {
            while (!Object.prototype.hasOwnProperty.call(object, property)) {
              object = _getPrototypeOf(object);
            return _get(target, property, receiver || target);
          }
 
-         var Emitter =
-         /*#__PURE__*/
-         function () {
+         var Emitter = /*#__PURE__*/function () {
            function Emitter() {
              _classCallCheck(this, Emitter);
 
            return Emitter;
          }();
 
-         var AbortSignal =
-         /*#__PURE__*/
-         function (_Emitter) {
+         var AbortSignal = /*#__PURE__*/function (_Emitter) {
            _inherits(AbortSignal, _Emitter);
 
+           var _super = _createSuper(AbortSignal);
+
            function AbortSignal() {
              var _this2;
 
              _classCallCheck(this, AbortSignal);
 
-             _this2 = _possibleConstructorReturn(this, _getPrototypeOf(AbortSignal).call(this)); // Some versions of babel does not transpile super() correctly for IE <= 10, if the parent
+             _this2 = _super.call(this); // Some versions of babel does not transpile super() correctly for IE <= 10, if the parent
              // constructor has failed to run, then "this.listeners" will still be undefined and then we call
              // the parent constructor directly instead as a workaround. For general details, see babel bug:
              // https://github.com/babel/babel/issues/3041
 
            return AbortSignal;
          }(Emitter);
-         var AbortController =
-         /*#__PURE__*/
-         function () {
-           function AbortController() {
-             _classCallCheck(this, AbortController);
 
-             // Compared to assignment, Object.defineProperty makes properties non-enumerable by default and
+         var AbortController = /*#__PURE__*/function () {
+           function AbortController() {
+             _classCallCheck(this, AbortController); // Compared to assignment, Object.defineProperty makes properties non-enumerable by default and
              // we want Object.keys(new AbortController()) to be [] for compat with the native impl
+
+
              Object.defineProperty(this, 'signal', {
                value: new AbortSignal(),
                writable: true,
 
            return typeof self.Request === 'function' && !self.Request.prototype.hasOwnProperty('signal') || !self.AbortController;
          }
-
          /**
           * Note: the "fetch.Request" default value is available for fetch imported from
           * the "node-fetch" package and not in browsers. This is OK since browsers
           * @returns {fetch: abortableFetch, Request: AbortableRequest}
           */
 
+
          function abortableFetchDecorator(patchTargets) {
            if ('function' === typeof patchTargets) {
              patchTargets = {
          }
 
          (function (self) {
-
            if (!polyfillNeeded(self)) {
              return;
            }
              value: AbortSignal
            });
          })(typeof self !== 'undefined' ? self : commonjsGlobal);
-
-       })));
+       });
 
        function actionAddEntity(way) {
-           return function(graph) {
-               return graph.replace(way);
-           };
+         return function (graph) {
+           return graph.replace(way);
+         };
        }
 
+       var IS_CONCAT_SPREADABLE = wellKnownSymbol('isConcatSpreadable');
+       var MAX_SAFE_INTEGER$1 = 0x1FFFFFFFFFFFFF;
+       var MAXIMUM_ALLOWED_INDEX_EXCEEDED = 'Maximum allowed index exceeded';
+
+       // We can't use this feature detection in V8 since it causes
+       // deoptimization and serious performance degradation
+       // https://github.com/zloirock/core-js/issues/679
+       var IS_CONCAT_SPREADABLE_SUPPORT = engineV8Version >= 51 || !fails(function () {
+         var array = [];
+         array[IS_CONCAT_SPREADABLE] = false;
+         return array.concat()[0] !== array;
+       });
+
+       var SPECIES_SUPPORT = arrayMethodHasSpeciesSupport('concat');
+
+       var isConcatSpreadable = function (O) {
+         if (!isObject(O)) return false;
+         var spreadable = O[IS_CONCAT_SPREADABLE];
+         return spreadable !== undefined ? !!spreadable : isArray(O);
+       };
+
+       var FORCED$7 = !IS_CONCAT_SPREADABLE_SUPPORT || !SPECIES_SUPPORT;
+
+       // `Array.prototype.concat` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.concat
+       // with adding support of @@isConcatSpreadable and @@species
+       _export({ target: 'Array', proto: true, forced: FORCED$7 }, {
+         concat: function concat(arg) { // eslint-disable-line no-unused-vars
+           var O = toObject(this);
+           var A = arraySpeciesCreate(O, 0);
+           var n = 0;
+           var i, k, length, len, E;
+           for (i = -1, length = arguments.length; i < length; i++) {
+             E = i === -1 ? O : arguments[i];
+             if (isConcatSpreadable(E)) {
+               len = toLength(E.length);
+               if (n + len > MAX_SAFE_INTEGER$1) throw TypeError(MAXIMUM_ALLOWED_INDEX_EXCEEDED);
+               for (k = 0; k < len; k++, n++) if (k in E) createProperty(A, n, E[k]);
+             } else {
+               if (n >= MAX_SAFE_INTEGER$1) throw TypeError(MAXIMUM_ALLOWED_INDEX_EXCEEDED);
+               createProperty(A, n++, E);
+             }
+           }
+           A.length = n;
+           return A;
+         }
+       });
+
+       // `Object.assign` method
+       // https://tc39.github.io/ecma262/#sec-object.assign
+       _export({ target: 'Object', stat: true, forced: Object.assign !== objectAssign }, {
+         assign: objectAssign
+       });
+
+       var $filter$1 = arrayIteration.filter;
+
+
+
+       var HAS_SPECIES_SUPPORT$3 = arrayMethodHasSpeciesSupport('filter');
+       // Edge 14- issue
+       var USES_TO_LENGTH$6 = arrayMethodUsesToLength('filter');
+
+       // `Array.prototype.filter` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.filter
+       // with adding support of @@species
+       _export({ target: 'Array', proto: true, forced: !HAS_SPECIES_SUPPORT$3 || !USES_TO_LENGTH$6 }, {
+         filter: function filter(callbackfn /* , thisArg */) {
+           return $filter$1(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
+         }
+       });
+
+       var nativeReverse = [].reverse;
+       var test$1 = [1, 2];
+
+       // `Array.prototype.reverse` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.reverse
+       // fix for Safari 12.0 bug
+       // https://bugs.webkit.org/show_bug.cgi?id=188794
+       _export({ target: 'Array', proto: true, forced: String(test$1) === String(test$1.reverse()) }, {
+         reverse: function reverse() {
+           // eslint-disable-next-line no-self-assign
+           if (isArray(this)) this.length = this.length;
+           return nativeReverse.call(this);
+         }
+       });
+
+       var FAILS_ON_PRIMITIVES$3 = fails(function () { objectKeys(1); });
+
+       // `Object.keys` method
+       // https://tc39.github.io/ecma262/#sec-object.keys
+       _export({ target: 'Object', stat: true, forced: FAILS_ON_PRIMITIVES$3 }, {
+         keys: function keys(it) {
+           return objectKeys(toObject(it));
+         }
+       });
+
+       var trim = stringTrim.trim;
+
+
+       var $parseFloat = global_1.parseFloat;
+       var FORCED$8 = 1 / $parseFloat(whitespaces + '-0') !== -Infinity;
+
+       // `parseFloat` method
+       // https://tc39.github.io/ecma262/#sec-parsefloat-string
+       var numberParseFloat = FORCED$8 ? function parseFloat(string) {
+         var trimmedString = trim(String(string));
+         var result = $parseFloat(trimmedString);
+         return result === 0 && trimmedString.charAt(0) == '-' ? -0 : result;
+       } : $parseFloat;
+
+       // `parseFloat` method
+       // https://tc39.github.io/ecma262/#sec-parsefloat-string
+       _export({ global: true, forced: parseFloat != numberParseFloat }, {
+         parseFloat: numberParseFloat
+       });
+
        /*
        Order the nodes of a way in reverse order and reverse any direction dependent tags
        other than `oneway`. (We assume that correcting a backwards oneway is the primary
            http://wiki.openstreetmap.org/wiki/Key:traffic_sign#On_a_way_or_area
        */
        function actionReverse(entityID, options) {
-           var ignoreKey = /^.*(_|:)?(description|name|note|website|ref|source|comment|watch|attribution)(_|:)?/;
-           var numeric = /^([+\-]?)(?=[\d.])/;
-           var directionKey = /direction$/;
-           var turn_lanes = /^turn:lanes:?/;
-           var keyReplacements = [
-               [/:right$/, ':left'],
-               [/:left$/, ':right'],
-               [/:forward$/, ':backward'],
-               [/:backward$/, ':forward'],
-               [/:right:/, ':left:'],
-               [/:left:/, ':right:'],
-               [/:forward:/, ':backward:'],
-               [/:backward:/, ':forward:']
-           ];
-           var valueReplacements = {
-               left: 'right',
-               right: 'left',
-               up: 'down',
-               down: 'up',
-               forward: 'backward',
-               backward: 'forward',
-               forwards: 'backward',
-               backwards: 'forward',
-           };
-           var roleReplacements = {
-               forward: 'backward',
-               backward: 'forward',
-               forwards: 'backward',
-               backwards: 'forward'
-           };
-           var onewayReplacements = {
-               yes: '-1',
-               '1': '-1',
-               '-1': 'yes'
-           };
-
-           var compassReplacements = {
-               N: 'S',
-               NNE: 'SSW',
-               NE: 'SW',
-               ENE: 'WSW',
-               E: 'W',
-               ESE: 'WNW',
-               SE: 'NW',
-               SSE: 'NNW',
-               S: 'N',
-               SSW: 'NNE',
-               SW: 'NE',
-               WSW: 'ENE',
-               W: 'E',
-               WNW: 'ESE',
-               NW: 'SE',
-               NNW: 'SSE'
-           };
-
-
-           function reverseKey(key) {
-               for (var i = 0; i < keyReplacements.length; ++i) {
-                   var replacement = keyReplacements[i];
-                   if (replacement[0].test(key)) {
-                       return key.replace(replacement[0], replacement[1]);
-                   }
+         var ignoreKey = /^.*(_|:)?(description|name|note|website|ref|source|comment|watch|attribution)(_|:)?/;
+         var numeric = /^([+\-]?)(?=[\d.])/;
+         var directionKey = /direction$/;
+         var turn_lanes = /^turn:lanes:?/;
+         var keyReplacements = [[/:right$/, ':left'], [/:left$/, ':right'], [/:forward$/, ':backward'], [/:backward$/, ':forward'], [/:right:/, ':left:'], [/:left:/, ':right:'], [/:forward:/, ':backward:'], [/:backward:/, ':forward:']];
+         var valueReplacements = {
+           left: 'right',
+           right: 'left',
+           up: 'down',
+           down: 'up',
+           forward: 'backward',
+           backward: 'forward',
+           forwards: 'backward',
+           backwards: 'forward'
+         };
+         var roleReplacements = {
+           forward: 'backward',
+           backward: 'forward',
+           forwards: 'backward',
+           backwards: 'forward'
+         };
+         var onewayReplacements = {
+           yes: '-1',
+           '1': '-1',
+           '-1': 'yes'
+         };
+         var compassReplacements = {
+           N: 'S',
+           NNE: 'SSW',
+           NE: 'SW',
+           ENE: 'WSW',
+           E: 'W',
+           ESE: 'WNW',
+           SE: 'NW',
+           SSE: 'NNW',
+           S: 'N',
+           SSW: 'NNE',
+           SW: 'NE',
+           WSW: 'ENE',
+           W: 'E',
+           WNW: 'ESE',
+           NW: 'SE',
+           NNW: 'SSE'
+         };
+
+         function reverseKey(key) {
+           for (var i = 0; i < keyReplacements.length; ++i) {
+             var replacement = keyReplacements[i];
+
+             if (replacement[0].test(key)) {
+               return key.replace(replacement[0], replacement[1]);
+             }
+           }
+
+           return key;
+         }
+
+         function reverseValue(key, value, includeAbsolute) {
+           if (ignoreKey.test(key)) return value; // Turn lanes are left/right to key (not way) direction - #5674
+
+           if (turn_lanes.test(key)) {
+             return value;
+           } else if (key === 'incline' && numeric.test(value)) {
+             return value.replace(numeric, function (_, sign) {
+               return sign === '-' ? '' : '-';
+             });
+           } else if (options && options.reverseOneway && key === 'oneway') {
+             return onewayReplacements[value] || value;
+           } else if (includeAbsolute && directionKey.test(key)) {
+             if (compassReplacements[value]) return compassReplacements[value];
+             var degrees = parseFloat(value);
+
+             if (typeof degrees === 'number' && !isNaN(degrees)) {
+               if (degrees < 180) {
+                 degrees += 180;
+               } else {
+                 degrees -= 180;
                }
-               return key;
-           }
-
 
-           function reverseValue(key, value, includeAbsolute) {
-               if (ignoreKey.test(key)) return value;
-
-               // Turn lanes are left/right to key (not way) direction - #5674
-               if (turn_lanes.test(key)) {
-                   return value;
+               return degrees.toString();
+             }
+           }
 
-               } else if (key === 'incline' && numeric.test(value)) {
-                   return value.replace(numeric, function(_, sign) { return sign === '-' ? '' : '-'; });
+           return valueReplacements[value] || value;
+         } // Reverse the direction of tags attached to the nodes - #3076
 
-               } else if (options && options.reverseOneway && key === 'oneway') {
-                   return onewayReplacements[value] || value;
 
-               } else if (includeAbsolute && directionKey.test(key)) {
-                   if (compassReplacements[value]) return compassReplacements[value];
+         function reverseNodeTags(graph, nodeIDs) {
+           for (var i = 0; i < nodeIDs.length; i++) {
+             var node = graph.hasEntity(nodeIDs[i]);
+             if (!node || !Object.keys(node.tags).length) continue;
+             var tags = {};
 
-                   var degrees = parseFloat(value);
-                   if (typeof degrees === 'number' && !isNaN(degrees)) {
-                       if (degrees < 180) {
-                           degrees += 180;
-                       } else {
-                           degrees -= 180;
-                       }
-                       return degrees.toString();
-                   }
-               }
+             for (var key in node.tags) {
+               tags[reverseKey(key)] = reverseValue(key, node.tags[key], node.id === entityID);
+             }
 
-               return valueReplacements[value] || value;
+             graph = graph.replace(node.update({
+               tags: tags
+             }));
            }
 
+           return graph;
+         }
 
-           // Reverse the direction of tags attached to the nodes - #3076
-           function reverseNodeTags(graph, nodeIDs) {
-               for (var i = 0; i < nodeIDs.length; i++) {
-                   var node = graph.hasEntity(nodeIDs[i]);
-                   if (!node || !Object.keys(node.tags).length) continue;
+         function reverseWay(graph, way) {
+           var nodes = way.nodes.slice().reverse();
+           var tags = {};
+           var role;
 
-                   var tags = {};
-                   for (var key in node.tags) {
-                       tags[reverseKey(key)] = reverseValue(key, node.tags[key], node.id === entityID);
-                   }
-                   graph = graph.replace(node.update({tags: tags}));
-               }
-               return graph;
+           for (var key in way.tags) {
+             tags[reverseKey(key)] = reverseValue(key, way.tags[key]);
            }
 
-
-           function reverseWay(graph, way) {
-               var nodes = way.nodes.slice().reverse();
-               var tags = {};
-               var role;
-
-               for (var key in way.tags) {
-                   tags[reverseKey(key)] = reverseValue(key, way.tags[key]);
+           graph.parentRelations(way).forEach(function (relation) {
+             relation.members.forEach(function (member, index) {
+               if (member.id === way.id && (role = roleReplacements[member.role])) {
+                 relation = relation.updateMember({
+                   role: role
+                 }, index);
+                 graph = graph.replace(relation);
                }
+             });
+           }); // Reverse any associated directions on nodes on the way and then replace
+           // the way itself with the reversed node ids and updated way tags
 
-               graph.parentRelations(way).forEach(function(relation) {
-                   relation.members.forEach(function(member, index) {
-                       if (member.id === way.id && (role = roleReplacements[member.role])) {
-                           relation = relation.updateMember({role: role}, index);
-                           graph = graph.replace(relation);
-                       }
-                   });
-               });
+           return reverseNodeTags(graph, nodes).replace(way.update({
+             nodes: nodes,
+             tags: tags
+           }));
+         }
+
+         var action = function action(graph) {
+           var entity = graph.entity(entityID);
 
-               // Reverse any associated directions on nodes on the way and then replace
-               // the way itself with the reversed node ids and updated way tags
-               return reverseNodeTags(graph, nodes)
-                   .replace(way.update({nodes: nodes, tags: tags}));
+           if (entity.type === 'way') {
+             return reverseWay(graph, entity);
            }
 
+           return reverseNodeTags(graph, [entityID]);
+         };
 
-           var action = function(graph) {
-               var entity = graph.entity(entityID);
-               if (entity.type === 'way') {
-                   return reverseWay(graph, entity);
-               }
-               return reverseNodeTags(graph, [entityID]);
-           };
+         action.disabled = function (graph) {
+           var entity = graph.hasEntity(entityID);
+           if (!entity || entity.type === 'way') return false;
 
-           action.disabled = function(graph) {
-               var entity = graph.hasEntity(entityID);
-               if (!entity || entity.type === 'way') return false;
+           for (var key in entity.tags) {
+             var value = entity.tags[key];
 
-               for (var key in entity.tags) {
-                   var value = entity.tags[key];
-                   if (reverseKey(key) !== key || reverseValue(key, value, true) !== value) {
-                       return false;
-                   }
-               }
-               return 'nondirectional_node';
-           };
+             if (reverseKey(key) !== key || reverseValue(key, value, true) !== value) {
+               return false;
+             }
+           }
 
-           action.entityID = function() {
-               return entityID;
-           };
+           return 'nondirectional_node';
+         };
 
-           return action;
+         action.entityID = function () {
+           return entityID;
+         };
+
+         return action;
        }
 
        function osmIsInterestingTag(key) {
-           return key !== 'attribution' &&
-               key !== 'created_by' &&
-               key !== 'source' &&
-               key !== 'odbl' &&
-               key.indexOf('source:') !== 0 &&
-               key.indexOf('source_ref') !== 0 && // purposely exclude colon
-               key.indexOf('tiger:') !== 0;
+         return key !== 'attribution' && key !== 'created_by' && key !== 'source' && key !== 'odbl' && key.indexOf('source:') !== 0 && key.indexOf('source_ref') !== 0 && // purposely exclude colon
+         key.indexOf('tiger:') !== 0;
        }
-
        var osmAreaKeys = {};
        function osmSetAreaKeys(value) {
-           osmAreaKeys = value;
-       }
+         osmAreaKeys = value;
+       } // returns an object with the tag from `tags` that implies an area geometry, if any
 
-       // returns an object with the tag from `tags` that implies an area geometry, if any
        function osmTagSuggestingArea(tags) {
-           if (tags.area === 'yes') return { area: 'yes' };
-           if (tags.area === 'no') return null;
-
-           // `highway` and `railway` are typically linear features, but there
-           // are a few exceptions that should be treated as areas, even in the
-           // absence of a proper `area=yes` or `areaKeys` tag.. see #4194
-           var lineKeys = {
-               highway: {
-                   rest_area: true,
-                   services: true
-               },
-               railway: {
-                   roundhouse: true,
-                   station: true,
-                   traverser: true,
-                   turntable: true,
-                   wash: true
-               }
-           };
-           var returnTags = {};
-           for (var key in tags) {
-               if (key in osmAreaKeys && !(tags[key] in osmAreaKeys[key])) {
-                   returnTags[key] = tags[key];
-                   return returnTags;
-               }
-               if (key in lineKeys && tags[key] in lineKeys[key]) {
-                   returnTags[key] = tags[key];
-                   return returnTags;
-               }
+         if (tags.area === 'yes') return {
+           area: 'yes'
+         };
+         if (tags.area === 'no') return null; // `highway` and `railway` are typically linear features, but there
+         // are a few exceptions that should be treated as areas, even in the
+         // absence of a proper `area=yes` or `areaKeys` tag.. see #4194
+
+         var lineKeys = {
+           highway: {
+             rest_area: true,
+             services: true
+           },
+           railway: {
+             roundhouse: true,
+             station: true,
+             traverser: true,
+             turntable: true,
+             wash: true
            }
-           return null;
-       }
+         };
+         var returnTags = {};
+
+         for (var key in tags) {
+           if (key in osmAreaKeys && !(tags[key] in osmAreaKeys[key])) {
+             returnTags[key] = tags[key];
+             return returnTags;
+           }
+
+           if (key in lineKeys && tags[key] in lineKeys[key]) {
+             returnTags[key] = tags[key];
+             return returnTags;
+           }
+         }
 
-       // Tags that indicate a node can be a standalone point
+         return null;
+       } // Tags that indicate a node can be a standalone point
        // e.g. { amenity: { bar: true, parking: true, ... } ... }
+
        var osmPointTags = {};
        function osmSetPointTags(value) {
-           osmPointTags = value;
-       }
-       // Tags that indicate a node can be part of a way
+         osmPointTags = value;
+       } // Tags that indicate a node can be part of a way
        // e.g. { amenity: { parking: true, ... }, highway: { stop: true ... } ... }
+
        var osmVertexTags = {};
        function osmSetVertexTags(value) {
-           osmVertexTags = value;
+         osmVertexTags = value;
        }
-
        function osmNodeGeometriesForTags(nodeTags) {
-           var geometries = {};
-           for (var key in nodeTags) {
-               if (osmPointTags[key] &&
-                   (osmPointTags[key]['*'] || osmPointTags[key][nodeTags[key]])) {
-                   geometries.point = true;
-               }
-               if (osmVertexTags[key] &&
-                   (osmVertexTags[key]['*'] || osmVertexTags[key][nodeTags[key]])) {
-                   geometries.vertex = true;
-               }
-               // break early if both are already supported
-               if (geometries.point && geometries.vertex) break;
+         var geometries = {};
+
+         for (var key in nodeTags) {
+           if (osmPointTags[key] && (osmPointTags[key]['*'] || osmPointTags[key][nodeTags[key]])) {
+             geometries.point = true;
            }
-           return geometries;
-       }
 
+           if (osmVertexTags[key] && (osmVertexTags[key]['*'] || osmVertexTags[key][nodeTags[key]])) {
+             geometries.vertex = true;
+           } // break early if both are already supported
+
+
+           if (geometries.point && geometries.vertex) break;
+         }
+
+         return geometries;
+       }
        var osmOneWayTags = {
-           'aerialway': {
-               'chair_lift': true,
-               'drag_lift': true,
-               'j-bar': true,
-               'magic_carpet': true,
-               'mixed_lift': true,
-               'platter': true,
-               'rope_tow': true,
-               't-bar': true,
-               'zip_line': true
-           },
-           'highway': {
-               'motorway': true
-           },
-           'junction': {
-               'circular': true,
-               'roundabout': true
-           },
-           'man_made': {
-               'goods_conveyor': true,
-               'piste:halfpipe': true
-           },
-           'piste:type': {
-               'downhill': true,
-               'sled': true,
-               'yes': true
-           },
-           'waterway': {
-               'canal': true,
-               'ditch': true,
-               'drain': true,
-               'fish_pass': true,
-               'river': true,
-               'stream': true,
-               'tidal_channel': true
-           }
-       };
+         'aerialway': {
+           'chair_lift': true,
+           'drag_lift': true,
+           'j-bar': true,
+           'magic_carpet': true,
+           'mixed_lift': true,
+           'platter': true,
+           'rope_tow': true,
+           't-bar': true,
+           'zip_line': true
+         },
+         'highway': {
+           'motorway': true
+         },
+         'junction': {
+           'circular': true,
+           'roundabout': true
+         },
+         'man_made': {
+           'goods_conveyor': true,
+           'piste:halfpipe': true
+         },
+         'piste:type': {
+           'downhill': true,
+           'sled': true,
+           'yes': true
+         },
+         'waterway': {
+           'canal': true,
+           'ditch': true,
+           'drain': true,
+           'fish_pass': true,
+           'river': true,
+           'stream': true,
+           'tidal_channel': true
+         }
+       }; // solid and smooth surfaces akin to the assumed default road surface in OSM
 
-       // solid and smooth surfaces akin to the assumed default road surface in OSM
        var osmPavedTags = {
-           'surface': {
-               'paved': true,
-               'asphalt': true,
-               'concrete': true,
-               'concrete:lanes': true,
-               'concrete:plates': true
-           },
-           'tracktype': {
-               'grade1': true
-           }
-       };
+         'surface': {
+           'paved': true,
+           'asphalt': true,
+           'concrete': true,
+           'concrete:lanes': true,
+           'concrete:plates': true
+         },
+         'tracktype': {
+           'grade1': true
+         }
+       }; // solid, if somewhat uncommon surfaces with a high range of smoothness
 
-       // solid, if somewhat uncommon surfaces with a high range of smoothness
        var osmSemipavedTags = {
-           'surface': {
-               'cobblestone': true,
-               'cobblestone:flattened': true,
-               'unhewn_cobblestone': true,
-               'sett': true,
-               'paving_stones': true,
-               'metal': true,
-               'wood': true
-           }
+         'surface': {
+           'cobblestone': true,
+           'cobblestone:flattened': true,
+           'unhewn_cobblestone': true,
+           'sett': true,
+           'paving_stones': true,
+           'metal': true,
+           'wood': true
+         }
        };
-
        var osmRightSideIsInsideTags = {
-           'natural': {
-               'cliff': true,
-               'coastline': 'coastline',
-           },
-           'barrier': {
-               'retaining_wall': true,
-               'kerb': true,
-               'guard_rail': true,
-               'city_wall': true,
-           },
-           'man_made': {
-               'embankment': true
-           },
-           'waterway': {
-               'weir': true
-           }
-       };
-
-       // "highway" tag values for pedestrian or vehicle right-of-ways that make up the routable network
+         'natural': {
+           'cliff': true,
+           'coastline': 'coastline'
+         },
+         'barrier': {
+           'retaining_wall': true,
+           'kerb': true,
+           'guard_rail': true,
+           'city_wall': true
+         },
+         'man_made': {
+           'embankment': true
+         },
+         'waterway': {
+           'weir': true
+         }
+       }; // "highway" tag values for pedestrian or vehicle right-of-ways that make up the routable network
        // (does not include `raceway`)
+
        var osmRoutableHighwayTagValues = {
-           motorway: true, trunk: true, primary: true, secondary: true, tertiary: true, residential: true,
-           motorway_link: true, trunk_link: true, primary_link: true, secondary_link: true, tertiary_link: true,
-           unclassified: true, road: true, service: true, track: true, living_street: true, bus_guideway: true,
-           path: true, footway: true, cycleway: true, bridleway: true, pedestrian: true, corridor: true, steps: true
-       };
-       // "highway" tag values that generally do not allow motor vehicles
+         motorway: true,
+         trunk: true,
+         primary: true,
+         secondary: true,
+         tertiary: true,
+         residential: true,
+         motorway_link: true,
+         trunk_link: true,
+         primary_link: true,
+         secondary_link: true,
+         tertiary_link: true,
+         unclassified: true,
+         road: true,
+         service: true,
+         track: true,
+         living_street: true,
+         bus_guideway: true,
+         path: true,
+         footway: true,
+         cycleway: true,
+         bridleway: true,
+         pedestrian: true,
+         corridor: true,
+         steps: true
+       }; // "highway" tag values that generally do not allow motor vehicles
+
        var osmPathHighwayTagValues = {
-           path: true, footway: true, cycleway: true, bridleway: true, pedestrian: true, corridor: true, steps: true
-       };
+         path: true,
+         footway: true,
+         cycleway: true,
+         bridleway: true,
+         pedestrian: true,
+         corridor: true,
+         steps: true
+       }; // "railway" tag values representing existing railroad tracks (purposely does not include 'abandoned')
 
-       // "railway" tag values representing existing railroad tracks (purposely does not include 'abandoned')
        var osmRailwayTrackTagValues = {
-           rail: true, light_rail: true, tram: true, subway: true,
-           monorail: true, funicular: true, miniature: true, narrow_gauge: true,
-           disused: true, preserved: true
-       };
+         rail: true,
+         light_rail: true,
+         tram: true,
+         subway: true,
+         monorail: true,
+         funicular: true,
+         miniature: true,
+         narrow_gauge: true,
+         disused: true,
+         preserved: true
+       }; // "waterway" tag values for line features representing water flow
 
-       // "waterway" tag values for line features representing water flow
        var osmFlowingWaterwayTagValues = {
-           canal: true, ditch: true, drain: true, fish_pass: true, river: true, stream: true, tidal_channel: true
+         canal: true,
+         ditch: true,
+         drain: true,
+         fish_pass: true,
+         river: true,
+         stream: true,
+         tidal_channel: true
        };
 
-       // Adds floating point numbers with twice the normal precision.
-       // Reference: J. R. Shewchuk, Adaptive Precision Floating-Point Arithmetic and
-       // Fast Robust Geometric Predicates, Discrete & Computational Geometry 18(3)
-       // 305–363 (1997).
-       // Code adapted from GeographicLib by Charles F. F. Karney,
-       // http://geographiclib.sourceforge.net/
+       var trim$1 = stringTrim.trim;
 
-       function adder() {
-         return new Adder;
-       }
 
-       function Adder() {
-         this.reset();
-       }
+       var $parseInt = global_1.parseInt;
+       var hex$1 = /^[+-]?0[Xx]/;
+       var FORCED$9 = $parseInt(whitespaces + '08') !== 8 || $parseInt(whitespaces + '0x16') !== 22;
 
-       Adder.prototype = {
-         constructor: Adder,
-         reset: function() {
-           this.s = // rounded value
-           this.t = 0; // exact error
-         },
-         add: function(y) {
-           add(temp, y, this.t);
-           add(this, temp.s, this.s);
-           if (this.s) this.t += temp.t;
-           else this.s = temp.t;
-         },
-         valueOf: function() {
-           return this.s;
-         }
-       };
+       // `parseInt` method
+       // https://tc39.github.io/ecma262/#sec-parseint-string-radix
+       var numberParseInt = FORCED$9 ? function parseInt(string, radix) {
+         var S = trim$1(String(string));
+         return $parseInt(S, (radix >>> 0) || (hex$1.test(S) ? 16 : 10));
+       } : $parseInt;
 
-       var temp = new Adder;
+       // `parseInt` method
+       // https://tc39.github.io/ecma262/#sec-parseint-string-radix
+       _export({ global: true, forced: parseInt != numberParseInt }, {
+         parseInt: numberParseInt
+       });
 
-       function add(adder, a, b) {
-         var x = adder.s = a + b,
-             bv = x - a,
-             av = x - bv;
-         adder.t = (a - av) + (b - bv);
-       }
+       var freezing = !fails(function () {
+         return Object.isExtensible(Object.preventExtensions({}));
+       });
 
-       var epsilon = 1e-6;
-       var epsilon2 = 1e-12;
-       var pi = Math.PI;
-       var halfPi = pi / 2;
-       var quarterPi = pi / 4;
-       var tau = pi * 2;
+       var internalMetadata = createCommonjsModule(function (module) {
+       var defineProperty = objectDefineProperty.f;
 
-       var degrees = 180 / pi;
-       var radians = pi / 180;
 
-       var abs$2 = Math.abs;
-       var atan = Math.atan;
-       var atan2 = Math.atan2;
-       var cos = Math.cos;
-       var exp = Math.exp;
-       var log = Math.log;
-       var sin = Math.sin;
-       var sign$2 = Math.sign || function(x) { return x > 0 ? 1 : x < 0 ? -1 : 0; };
-       var sqrt = Math.sqrt;
-       var tan = Math.tan;
 
-       function acos(x) {
-         return x > 1 ? 0 : x < -1 ? pi : Math.acos(x);
-       }
+       var METADATA = uid('meta');
+       var id = 0;
 
-       function asin(x) {
-         return x > 1 ? halfPi : x < -1 ? -halfPi : Math.asin(x);
-       }
+       var isExtensible = Object.isExtensible || function () {
+         return true;
+       };
 
-       function noop$2() {}
+       var setMetadata = function (it) {
+         defineProperty(it, METADATA, { value: {
+           objectID: 'O' + ++id, // object ID
+           weakData: {}          // weak collections IDs
+         } });
+       };
 
-       function streamGeometry(geometry, stream) {
-         if (geometry && streamGeometryType.hasOwnProperty(geometry.type)) {
-           streamGeometryType[geometry.type](geometry, stream);
-         }
-       }
+       var fastKey = function (it, create) {
+         // return a primitive with prefix
+         if (!isObject(it)) return typeof it == 'symbol' ? it : (typeof it == 'string' ? 'S' : 'P') + it;
+         if (!has(it, METADATA)) {
+           // can't set metadata to uncaught frozen object
+           if (!isExtensible(it)) return 'F';
+           // not necessary to add metadata
+           if (!create) return 'E';
+           // add missing metadata
+           setMetadata(it);
+         // return object ID
+         } return it[METADATA].objectID;
+       };
 
-       var streamObjectType = {
-         Feature: function(object, stream) {
-           streamGeometry(object.geometry, stream);
-         },
-         FeatureCollection: function(object, stream) {
-           var features = object.features, i = -1, n = features.length;
-           while (++i < n) streamGeometry(features[i].geometry, stream);
-         }
+       var getWeakData = function (it, create) {
+         if (!has(it, METADATA)) {
+           // can't set metadata to uncaught frozen object
+           if (!isExtensible(it)) return true;
+           // not necessary to add metadata
+           if (!create) return false;
+           // add missing metadata
+           setMetadata(it);
+         // return the store of weak collections IDs
+         } return it[METADATA].weakData;
        };
 
-       var streamGeometryType = {
-         Sphere: function(object, stream) {
-           stream.sphere();
-         },
-         Point: function(object, stream) {
-           object = object.coordinates;
-           stream.point(object[0], object[1], object[2]);
-         },
-         MultiPoint: function(object, stream) {
-           var coordinates = object.coordinates, i = -1, n = coordinates.length;
-           while (++i < n) object = coordinates[i], stream.point(object[0], object[1], object[2]);
-         },
-         LineString: function(object, stream) {
-           streamLine(object.coordinates, stream, 0);
-         },
-         MultiLineString: function(object, stream) {
-           var coordinates = object.coordinates, i = -1, n = coordinates.length;
-           while (++i < n) streamLine(coordinates[i], stream, 0);
-         },
-         Polygon: function(object, stream) {
-           streamPolygon(object.coordinates, stream);
-         },
-         MultiPolygon: function(object, stream) {
-           var coordinates = object.coordinates, i = -1, n = coordinates.length;
-           while (++i < n) streamPolygon(coordinates[i], stream);
-         },
-         GeometryCollection: function(object, stream) {
-           var geometries = object.geometries, i = -1, n = geometries.length;
-           while (++i < n) streamGeometry(geometries[i], stream);
-         }
+       // add metadata on freeze-family methods calling
+       var onFreeze = function (it) {
+         if (freezing && meta.REQUIRED && isExtensible(it) && !has(it, METADATA)) setMetadata(it);
+         return it;
        };
 
-       function streamLine(coordinates, stream, closed) {
-         var i = -1, n = coordinates.length - closed, coordinate;
-         stream.lineStart();
-         while (++i < n) coordinate = coordinates[i], stream.point(coordinate[0], coordinate[1], coordinate[2]);
-         stream.lineEnd();
-       }
+       var meta = module.exports = {
+         REQUIRED: false,
+         fastKey: fastKey,
+         getWeakData: getWeakData,
+         onFreeze: onFreeze
+       };
 
-       function streamPolygon(coordinates, stream) {
-         var i = -1, n = coordinates.length;
-         stream.polygonStart();
-         while (++i < n) streamLine(coordinates[i], stream, 1);
-         stream.polygonEnd();
-       }
+       hiddenKeys[METADATA] = true;
+       });
 
-       function d3_geoStream(object, stream) {
-         if (object && streamObjectType.hasOwnProperty(object.type)) {
-           streamObjectType[object.type](object, stream);
-         } else {
-           streamGeometry(object, stream);
-         }
-       }
+       var collection = function (CONSTRUCTOR_NAME, wrapper, common) {
+         var IS_MAP = CONSTRUCTOR_NAME.indexOf('Map') !== -1;
+         var IS_WEAK = CONSTRUCTOR_NAME.indexOf('Weak') !== -1;
+         var ADDER = IS_MAP ? 'set' : 'add';
+         var NativeConstructor = global_1[CONSTRUCTOR_NAME];
+         var NativePrototype = NativeConstructor && NativeConstructor.prototype;
+         var Constructor = NativeConstructor;
+         var exported = {};
+
+         var fixMethod = function (KEY) {
+           var nativeMethod = NativePrototype[KEY];
+           redefine(NativePrototype, KEY,
+             KEY == 'add' ? function add(value) {
+               nativeMethod.call(this, value === 0 ? 0 : value);
+               return this;
+             } : KEY == 'delete' ? function (key) {
+               return IS_WEAK && !isObject(key) ? false : nativeMethod.call(this, key === 0 ? 0 : key);
+             } : KEY == 'get' ? function get(key) {
+               return IS_WEAK && !isObject(key) ? undefined : nativeMethod.call(this, key === 0 ? 0 : key);
+             } : KEY == 'has' ? function has(key) {
+               return IS_WEAK && !isObject(key) ? false : nativeMethod.call(this, key === 0 ? 0 : key);
+             } : function set(key, value) {
+               nativeMethod.call(this, key === 0 ? 0 : key, value);
+               return this;
+             }
+           );
+         };
 
-       var areaRingSum = adder();
+         // eslint-disable-next-line max-len
+         if (isForced_1(CONSTRUCTOR_NAME, typeof NativeConstructor != 'function' || !(IS_WEAK || NativePrototype.forEach && !fails(function () {
+           new NativeConstructor().entries().next();
+         })))) {
+           // create collection constructor
+           Constructor = common.getConstructor(wrapper, CONSTRUCTOR_NAME, IS_MAP, ADDER);
+           internalMetadata.REQUIRED = true;
+         } else if (isForced_1(CONSTRUCTOR_NAME, true)) {
+           var instance = new Constructor();
+           // early implementations not supports chaining
+           var HASNT_CHAINING = instance[ADDER](IS_WEAK ? {} : -0, 1) != instance;
+           // V8 ~ Chromium 40- weak-collections throws on primitives, but should return false
+           var THROWS_ON_PRIMITIVES = fails(function () { instance.has(1); });
+           // most early implementations doesn't supports iterables, most modern - not close it correctly
+           // eslint-disable-next-line no-new
+           var ACCEPT_ITERABLES = checkCorrectnessOfIteration(function (iterable) { new NativeConstructor(iterable); });
+           // for early implementations -0 and +0 not the same
+           var BUGGY_ZERO = !IS_WEAK && fails(function () {
+             // V8 ~ Chromium 42- fails only with 5+ elements
+             var $instance = new NativeConstructor();
+             var index = 5;
+             while (index--) $instance[ADDER](index, index);
+             return !$instance.has(-0);
+           });
 
-       var areaSum = adder(),
-           lambda00,
-           phi00,
-           lambda0,
-           cosPhi0,
-           sinPhi0;
+           if (!ACCEPT_ITERABLES) {
+             Constructor = wrapper(function (dummy, iterable) {
+               anInstance(dummy, Constructor, CONSTRUCTOR_NAME);
+               var that = inheritIfRequired(new NativeConstructor(), dummy, Constructor);
+               if (iterable != undefined) iterate_1(iterable, that[ADDER], that, IS_MAP);
+               return that;
+             });
+             Constructor.prototype = NativePrototype;
+             NativePrototype.constructor = Constructor;
+           }
 
-       var areaStream = {
-         point: noop$2,
-         lineStart: noop$2,
-         lineEnd: noop$2,
-         polygonStart: function() {
-           areaRingSum.reset();
-           areaStream.lineStart = areaRingStart;
-           areaStream.lineEnd = areaRingEnd;
-         },
-         polygonEnd: function() {
-           var areaRing = +areaRingSum;
-           areaSum.add(areaRing < 0 ? tau + areaRing : areaRing);
-           this.lineStart = this.lineEnd = this.point = noop$2;
-         },
-         sphere: function() {
-           areaSum.add(tau);
+           if (THROWS_ON_PRIMITIVES || BUGGY_ZERO) {
+             fixMethod('delete');
+             fixMethod('has');
+             IS_MAP && fixMethod('get');
+           }
+
+           if (BUGGY_ZERO || HASNT_CHAINING) fixMethod(ADDER);
+
+           // weak collections should not contains .clear method
+           if (IS_WEAK && NativePrototype.clear) delete NativePrototype.clear;
          }
-       };
 
-       function areaRingStart() {
-         areaStream.point = areaPointFirst;
-       }
+         exported[CONSTRUCTOR_NAME] = Constructor;
+         _export({ global: true, forced: Constructor != NativeConstructor }, exported);
 
-       function areaRingEnd() {
-         areaPoint(lambda00, phi00);
-       }
+         setToStringTag(Constructor, CONSTRUCTOR_NAME);
 
-       function areaPointFirst(lambda, phi) {
-         areaStream.point = areaPoint;
-         lambda00 = lambda, phi00 = phi;
-         lambda *= radians, phi *= radians;
-         lambda0 = lambda, cosPhi0 = cos(phi = phi / 2 + quarterPi), sinPhi0 = sin(phi);
-       }
+         if (!IS_WEAK) common.setStrong(Constructor, CONSTRUCTOR_NAME, IS_MAP);
 
-       function areaPoint(lambda, phi) {
-         lambda *= radians, phi *= radians;
-         phi = phi / 2 + quarterPi; // half the angular distance from south pole
+         return Constructor;
+       };
 
-         // Spherical excess E for a spherical triangle with vertices: south pole,
-         // previous point, current point.  Uses a formula derived from Cagnoli’s
-         // theorem.  See Todhunter, Spherical Trig. (1871), Sec. 103, Eq. (2).
-         var dLambda = lambda - lambda0,
-             sdLambda = dLambda >= 0 ? 1 : -1,
-             adLambda = sdLambda * dLambda,
-             cosPhi = cos(phi),
-             sinPhi = sin(phi),
-             k = sinPhi0 * sinPhi,
-             u = cosPhi0 * cosPhi + k * cos(adLambda),
-             v = k * sdLambda * sin(adLambda);
-         areaRingSum.add(atan2(v, u));
+       var defineProperty$8 = objectDefineProperty.f;
 
-         // Advance the previous points.
-         lambda0 = lambda, cosPhi0 = cosPhi, sinPhi0 = sinPhi;
-       }
 
-       function d3_geoArea(object) {
-         areaSum.reset();
-         d3_geoStream(object, areaStream);
-         return areaSum * 2;
-       }
 
-       function spherical(cartesian) {
-         return [atan2(cartesian[1], cartesian[0]), asin(cartesian[2])];
-       }
 
-       function cartesian(spherical) {
-         var lambda = spherical[0], phi = spherical[1], cosPhi = cos(phi);
-         return [cosPhi * cos(lambda), cosPhi * sin(lambda), sin(phi)];
-       }
 
-       function cartesianDot(a, b) {
-         return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
-       }
 
-       function cartesianCross(a, b) {
-         return [a[1] * b[2] - a[2] * b[1], a[2] * b[0] - a[0] * b[2], a[0] * b[1] - a[1] * b[0]];
-       }
 
-       // TODO return a
-       function cartesianAddInPlace(a, b) {
-         a[0] += b[0], a[1] += b[1], a[2] += b[2];
-       }
 
-       function cartesianScale(vector, k) {
-         return [vector[0] * k, vector[1] * k, vector[2] * k];
-       }
+       var fastKey = internalMetadata.fastKey;
 
-       // TODO return d
-       function cartesianNormalizeInPlace(d) {
-         var l = sqrt(d[0] * d[0] + d[1] * d[1] + d[2] * d[2]);
-         d[0] /= l, d[1] /= l, d[2] /= l;
-       }
 
-       var lambda0$1, phi0, lambda1, phi1, // bounds
-           lambda2, // previous lambda-coordinate
-           lambda00$1, phi00$1, // first point
-           p0, // previous 3D point
-           deltaSum = adder(),
-           ranges,
-           range;
+       var setInternalState$7 = internalState.set;
+       var internalStateGetterFor = internalState.getterFor;
 
-       var boundsStream = {
-         point: boundsPoint,
-         lineStart: boundsLineStart,
-         lineEnd: boundsLineEnd,
-         polygonStart: function() {
-           boundsStream.point = boundsRingPoint;
-           boundsStream.lineStart = boundsRingStart;
-           boundsStream.lineEnd = boundsRingEnd;
-           deltaSum.reset();
-           areaStream.polygonStart();
-         },
-         polygonEnd: function() {
-           areaStream.polygonEnd();
-           boundsStream.point = boundsPoint;
-           boundsStream.lineStart = boundsLineStart;
-           boundsStream.lineEnd = boundsLineEnd;
-           if (areaRingSum < 0) lambda0$1 = -(lambda1 = 180), phi0 = -(phi1 = 90);
-           else if (deltaSum > epsilon) phi1 = 90;
-           else if (deltaSum < -epsilon) phi0 = -90;
-           range[0] = lambda0$1, range[1] = lambda1;
-         },
-         sphere: function() {
-           lambda0$1 = -(lambda1 = 180), phi0 = -(phi1 = 90);
-         }
-       };
+       var collectionStrong = {
+         getConstructor: function (wrapper, CONSTRUCTOR_NAME, IS_MAP, ADDER) {
+           var C = wrapper(function (that, iterable) {
+             anInstance(that, C, CONSTRUCTOR_NAME);
+             setInternalState$7(that, {
+               type: CONSTRUCTOR_NAME,
+               index: objectCreate(null),
+               first: undefined,
+               last: undefined,
+               size: 0
+             });
+             if (!descriptors) that.size = 0;
+             if (iterable != undefined) iterate_1(iterable, that[ADDER], that, IS_MAP);
+           });
 
-       function boundsPoint(lambda, phi) {
-         ranges.push(range = [lambda0$1 = lambda, lambda1 = lambda]);
-         if (phi < phi0) phi0 = phi;
-         if (phi > phi1) phi1 = phi;
-       }
+           var getInternalState = internalStateGetterFor(CONSTRUCTOR_NAME);
 
-       function linePoint(lambda, phi) {
-         var p = cartesian([lambda * radians, phi * radians]);
-         if (p0) {
-           var normal = cartesianCross(p0, p),
-               equatorial = [normal[1], -normal[0], 0],
-               inflection = cartesianCross(equatorial, normal);
-           cartesianNormalizeInPlace(inflection);
-           inflection = spherical(inflection);
-           var delta = lambda - lambda2,
-               sign = delta > 0 ? 1 : -1,
-               lambdai = inflection[0] * degrees * sign,
-               phii,
-               antimeridian = abs$2(delta) > 180;
-           if (antimeridian ^ (sign * lambda2 < lambdai && lambdai < sign * lambda)) {
-             phii = inflection[1] * degrees;
-             if (phii > phi1) phi1 = phii;
-           } else if (lambdai = (lambdai + 360) % 360 - 180, antimeridian ^ (sign * lambda2 < lambdai && lambdai < sign * lambda)) {
-             phii = -inflection[1] * degrees;
-             if (phii < phi0) phi0 = phii;
-           } else {
-             if (phi < phi0) phi0 = phi;
-             if (phi > phi1) phi1 = phi;
-           }
-           if (antimeridian) {
-             if (lambda < lambda2) {
-               if (angle(lambda0$1, lambda) > angle(lambda0$1, lambda1)) lambda1 = lambda;
-             } else {
-               if (angle(lambda, lambda1) > angle(lambda0$1, lambda1)) lambda0$1 = lambda;
-             }
-           } else {
-             if (lambda1 >= lambda0$1) {
-               if (lambda < lambda0$1) lambda0$1 = lambda;
-               if (lambda > lambda1) lambda1 = lambda;
+           var define = function (that, key, value) {
+             var state = getInternalState(that);
+             var entry = getEntry(that, key);
+             var previous, index;
+             // change existing entry
+             if (entry) {
+               entry.value = value;
+             // create new entry
              } else {
-               if (lambda > lambda2) {
-                 if (angle(lambda0$1, lambda) > angle(lambda0$1, lambda1)) lambda1 = lambda;
-               } else {
-                 if (angle(lambda, lambda1) > angle(lambda0$1, lambda1)) lambda0$1 = lambda;
+               state.last = entry = {
+                 index: index = fastKey(key, true),
+                 key: key,
+                 value: value,
+                 previous: previous = state.last,
+                 next: undefined,
+                 removed: false
+               };
+               if (!state.first) state.first = entry;
+               if (previous) previous.next = entry;
+               if (descriptors) state.size++;
+               else that.size++;
+               // add to index
+               if (index !== 'F') state.index[index] = entry;
+             } return that;
+           };
+
+           var getEntry = function (that, key) {
+             var state = getInternalState(that);
+             // fast case
+             var index = fastKey(key);
+             var entry;
+             if (index !== 'F') return state.index[index];
+             // frozen object case
+             for (entry = state.first; entry; entry = entry.next) {
+               if (entry.key == key) return entry;
+             }
+           };
+
+           redefineAll(C.prototype, {
+             // 23.1.3.1 Map.prototype.clear()
+             // 23.2.3.2 Set.prototype.clear()
+             clear: function clear() {
+               var that = this;
+               var state = getInternalState(that);
+               var data = state.index;
+               var entry = state.first;
+               while (entry) {
+                 entry.removed = true;
+                 if (entry.previous) entry.previous = entry.previous.next = undefined;
+                 delete data[entry.index];
+                 entry = entry.next;
+               }
+               state.first = state.last = undefined;
+               if (descriptors) state.size = 0;
+               else that.size = 0;
+             },
+             // 23.1.3.3 Map.prototype.delete(key)
+             // 23.2.3.4 Set.prototype.delete(value)
+             'delete': function (key) {
+               var that = this;
+               var state = getInternalState(that);
+               var entry = getEntry(that, key);
+               if (entry) {
+                 var next = entry.next;
+                 var prev = entry.previous;
+                 delete state.index[entry.index];
+                 entry.removed = true;
+                 if (prev) prev.next = next;
+                 if (next) next.previous = prev;
+                 if (state.first == entry) state.first = next;
+                 if (state.last == entry) state.last = prev;
+                 if (descriptors) state.size--;
+                 else that.size--;
+               } return !!entry;
+             },
+             // 23.2.3.6 Set.prototype.forEach(callbackfn, thisArg = undefined)
+             // 23.1.3.5 Map.prototype.forEach(callbackfn, thisArg = undefined)
+             forEach: function forEach(callbackfn /* , that = undefined */) {
+               var state = getInternalState(this);
+               var boundFunction = functionBindContext(callbackfn, arguments.length > 1 ? arguments[1] : undefined, 3);
+               var entry;
+               while (entry = entry ? entry.next : state.first) {
+                 boundFunction(entry.value, entry.key, this);
+                 // revert to the last existing entry
+                 while (entry && entry.removed) entry = entry.previous;
                }
+             },
+             // 23.1.3.7 Map.prototype.has(key)
+             // 23.2.3.7 Set.prototype.has(value)
+             has: function has(key) {
+               return !!getEntry(this, key);
              }
-           }
-         } else {
-           ranges.push(range = [lambda0$1 = lambda, lambda1 = lambda]);
-         }
-         if (phi < phi0) phi0 = phi;
-         if (phi > phi1) phi1 = phi;
-         p0 = p, lambda2 = lambda;
-       }
-
-       function boundsLineStart() {
-         boundsStream.point = linePoint;
-       }
-
-       function boundsLineEnd() {
-         range[0] = lambda0$1, range[1] = lambda1;
-         boundsStream.point = boundsPoint;
-         p0 = null;
-       }
-
-       function boundsRingPoint(lambda, phi) {
-         if (p0) {
-           var delta = lambda - lambda2;
-           deltaSum.add(abs$2(delta) > 180 ? delta + (delta > 0 ? 360 : -360) : delta);
-         } else {
-           lambda00$1 = lambda, phi00$1 = phi;
-         }
-         areaStream.point(lambda, phi);
-         linePoint(lambda, phi);
-       }
+           });
 
-       function boundsRingStart() {
-         areaStream.lineStart();
+           redefineAll(C.prototype, IS_MAP ? {
+             // 23.1.3.6 Map.prototype.get(key)
+             get: function get(key) {
+               var entry = getEntry(this, key);
+               return entry && entry.value;
+             },
+             // 23.1.3.9 Map.prototype.set(key, value)
+             set: function set(key, value) {
+               return define(this, key === 0 ? 0 : key, value);
+             }
+           } : {
+             // 23.2.3.1 Set.prototype.add(value)
+             add: function add(value) {
+               return define(this, value = value === 0 ? 0 : value, value);
+             }
+           });
+           if (descriptors) defineProperty$8(C.prototype, 'size', {
+             get: function () {
+               return getInternalState(this).size;
+             }
+           });
+           return C;
+         },
+         setStrong: function (C, CONSTRUCTOR_NAME, IS_MAP) {
+           var ITERATOR_NAME = CONSTRUCTOR_NAME + ' Iterator';
+           var getInternalCollectionState = internalStateGetterFor(CONSTRUCTOR_NAME);
+           var getInternalIteratorState = internalStateGetterFor(ITERATOR_NAME);
+           // add .keys, .values, .entries, [@@iterator]
+           // 23.1.3.4, 23.1.3.8, 23.1.3.11, 23.1.3.12, 23.2.3.5, 23.2.3.8, 23.2.3.10, 23.2.3.11
+           defineIterator(C, CONSTRUCTOR_NAME, function (iterated, kind) {
+             setInternalState$7(this, {
+               type: ITERATOR_NAME,
+               target: iterated,
+               state: getInternalCollectionState(iterated),
+               kind: kind,
+               last: undefined
+             });
+           }, function () {
+             var state = getInternalIteratorState(this);
+             var kind = state.kind;
+             var entry = state.last;
+             // revert to the last existing entry
+             while (entry && entry.removed) entry = entry.previous;
+             // get next entry
+             if (!state.target || !(state.last = entry = entry ? entry.next : state.state.first)) {
+               // or finish the iteration
+               state.target = undefined;
+               return { value: undefined, done: true };
+             }
+             // return step by kind
+             if (kind == 'keys') return { value: entry.key, done: false };
+             if (kind == 'values') return { value: entry.value, done: false };
+             return { value: [entry.key, entry.value], done: false };
+           }, IS_MAP ? 'entries' : 'values', !IS_MAP, true);
+
+           // add [@@species], 23.1.2.2, 23.2.2.2
+           setSpecies(CONSTRUCTOR_NAME);
+         }
+       };
+
+       // `Set` constructor
+       // https://tc39.github.io/ecma262/#sec-set-objects
+       var es_set = collection('Set', function (init) {
+         return function Set() { return init(this, arguments.length ? arguments[0] : undefined); };
+       }, collectionStrong);
+
+       function d3_ascending (a, b) {
+         return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
        }
 
-       function boundsRingEnd() {
-         boundsRingPoint(lambda00$1, phi00$1);
-         areaStream.lineEnd();
-         if (abs$2(deltaSum) > epsilon) lambda0$1 = -(lambda1 = 180);
-         range[0] = lambda0$1, range[1] = lambda1;
-         p0 = null;
-       }
+       function d3_bisector (f) {
+         var delta = f;
+         var compare = f;
 
-       // Finds the left-right distance between two longitudes.
-       // This is almost the same as (lambda1 - lambda0 + 360°) % 360°, except that we want
-       // the distance between ±180° to be 360°.
-       function angle(lambda0, lambda1) {
-         return (lambda1 -= lambda0) < 0 ? lambda1 + 360 : lambda1;
-       }
+         if (f.length === 1) {
+           delta = function delta(d, x) {
+             return f(d) - x;
+           };
 
-       function rangeCompare(a, b) {
-         return a[0] - b[0];
-       }
+           compare = ascendingComparator(f);
+         }
 
-       function rangeContains(range, x) {
-         return range[0] <= range[1] ? range[0] <= x && x <= range[1] : x < range[0] || range[1] < x;
-       }
+         function left(a, x, lo, hi) {
+           if (lo == null) lo = 0;
+           if (hi == null) hi = a.length;
 
-       function d3_geoBounds(feature) {
-         var i, n, a, b, merged, deltaMax, delta;
+           while (lo < hi) {
+             var mid = lo + hi >>> 1;
+             if (compare(a[mid], x) < 0) lo = mid + 1;else hi = mid;
+           }
 
-         phi1 = lambda1 = -(lambda0$1 = phi0 = Infinity);
-         ranges = [];
-         d3_geoStream(feature, boundsStream);
+           return lo;
+         }
 
-         // First, sort ranges by their minimum longitudes.
-         if (n = ranges.length) {
-           ranges.sort(rangeCompare);
+         function right(a, x, lo, hi) {
+           if (lo == null) lo = 0;
+           if (hi == null) hi = a.length;
 
-           // Then, merge any ranges that overlap.
-           for (i = 1, a = ranges[0], merged = [a]; i < n; ++i) {
-             b = ranges[i];
-             if (rangeContains(a, b[0]) || rangeContains(a, b[1])) {
-               if (angle(a[0], b[1]) > angle(a[0], a[1])) a[1] = b[1];
-               if (angle(b[0], a[1]) > angle(a[0], a[1])) a[0] = b[0];
-             } else {
-               merged.push(a = b);
-             }
+           while (lo < hi) {
+             var mid = lo + hi >>> 1;
+             if (compare(a[mid], x) > 0) hi = mid;else lo = mid + 1;
            }
 
-           // Finally, find the largest gap between the merged ranges.
-           // The final bounding box will be the inverse of this gap.
-           for (deltaMax = -Infinity, n = merged.length - 1, i = 0, a = merged[n]; i <= n; a = b, ++i) {
-             b = merged[i];
-             if ((delta = angle(a[1], b[0])) > deltaMax) deltaMax = delta, lambda0$1 = b[0], lambda1 = a[1];
-           }
+           return lo;
          }
 
-         ranges = range = null;
+         function center(a, x, lo, hi) {
+           if (lo == null) lo = 0;
+           if (hi == null) hi = a.length;
+           var i = left(a, x, lo, hi - 1);
+           return i > lo && delta(a[i - 1], x) > -delta(a[i], x) ? i - 1 : i;
+         }
 
-         return lambda0$1 === Infinity || phi0 === Infinity
-             ? [[NaN, NaN], [NaN, NaN]]
-             : [[lambda0$1, phi0], [lambda1, phi1]];
+         return {
+           left: left,
+           center: center,
+           right: right
+         };
        }
 
-       var W0, W1,
-           X0, Y0, Z0,
-           X1, Y1, Z1,
-           X2, Y2, Z2,
-           lambda00$2, phi00$2, // first point
-           x0, y0, z0; // previous point
-
-       var centroidStream = {
-         sphere: noop$2,
-         point: centroidPoint,
-         lineStart: centroidLineStart,
-         lineEnd: centroidLineEnd,
-         polygonStart: function() {
-           centroidStream.lineStart = centroidRingStart;
-           centroidStream.lineEnd = centroidRingEnd;
-         },
-         polygonEnd: function() {
-           centroidStream.lineStart = centroidLineStart;
-           centroidStream.lineEnd = centroidLineEnd;
-         }
-       };
-
-       // Arithmetic mean of Cartesian vectors.
-       function centroidPoint(lambda, phi) {
-         lambda *= radians, phi *= radians;
-         var cosPhi = cos(phi);
-         centroidPointCartesian(cosPhi * cos(lambda), cosPhi * sin(lambda), sin(phi));
-       }
-
-       function centroidPointCartesian(x, y, z) {
-         ++W0;
-         X0 += (x - X0) / W0;
-         Y0 += (y - Y0) / W0;
-         Z0 += (z - Z0) / W0;
+       function ascendingComparator(f) {
+         return function (d, x) {
+           return d3_ascending(f(d), x);
+         };
        }
 
-       function centroidLineStart() {
-         centroidStream.point = centroidLinePointFirst;
-       }
+       // `Symbol.asyncIterator` well-known symbol
+       // https://tc39.github.io/ecma262/#sec-symbol.asynciterator
+       defineWellKnownSymbol('asyncIterator');
 
-       function centroidLinePointFirst(lambda, phi) {
-         lambda *= radians, phi *= radians;
-         var cosPhi = cos(phi);
-         x0 = cosPhi * cos(lambda);
-         y0 = cosPhi * sin(lambda);
-         z0 = sin(phi);
-         centroidStream.point = centroidLinePoint;
-         centroidPointCartesian(x0, y0, z0);
-       }
+       var runtime_1 = createCommonjsModule(function (module) {
+         /**
+          * Copyright (c) 2014-present, Facebook, Inc.
+          *
+          * This source code is licensed under the MIT license found in the
+          * LICENSE file in the root directory of this source tree.
+          */
+         var runtime = function (exports) {
+
+           var Op = Object.prototype;
+           var hasOwn = Op.hasOwnProperty;
+           var undefined$1; // More compressible than void 0.
+
+           var $Symbol = typeof Symbol === "function" ? Symbol : {};
+           var iteratorSymbol = $Symbol.iterator || "@@iterator";
+           var asyncIteratorSymbol = $Symbol.asyncIterator || "@@asyncIterator";
+           var toStringTagSymbol = $Symbol.toStringTag || "@@toStringTag";
+
+           function define(obj, key, value) {
+             Object.defineProperty(obj, key, {
+               value: value,
+               enumerable: true,
+               configurable: true,
+               writable: true
+             });
+             return obj[key];
+           }
 
-       function centroidLinePoint(lambda, phi) {
-         lambda *= radians, phi *= radians;
-         var cosPhi = cos(phi),
-             x = cosPhi * cos(lambda),
-             y = cosPhi * sin(lambda),
-             z = sin(phi),
-             w = atan2(sqrt((w = y0 * z - z0 * y) * w + (w = z0 * x - x0 * z) * w + (w = x0 * y - y0 * x) * w), x0 * x + y0 * y + z0 * z);
-         W1 += w;
-         X1 += w * (x0 + (x0 = x));
-         Y1 += w * (y0 + (y0 = y));
-         Z1 += w * (z0 + (z0 = z));
-         centroidPointCartesian(x0, y0, z0);
-       }
+           try {
+             // IE 8 has a broken Object.defineProperty that only works on DOM objects.
+             define({}, "");
+           } catch (err) {
+             define = function define(obj, key, value) {
+               return obj[key] = value;
+             };
+           }
 
-       function centroidLineEnd() {
-         centroidStream.point = centroidPoint;
-       }
+           function wrap(innerFn, outerFn, self, tryLocsList) {
+             // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.
+             var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;
+             var generator = Object.create(protoGenerator.prototype);
+             var context = new Context(tryLocsList || []); // The ._invoke method unifies the implementations of the .next,
+             // .throw, and .return methods.
 
-       // See J. E. Brock, The Inertia Tensor for a Spherical Triangle,
-       // J. Applied Mechanics 42, 239 (1975).
-       function centroidRingStart() {
-         centroidStream.point = centroidRingPointFirst;
-       }
+             generator._invoke = makeInvokeMethod(innerFn, self, context);
+             return generator;
+           }
 
-       function centroidRingEnd() {
-         centroidRingPoint(lambda00$2, phi00$2);
-         centroidStream.point = centroidPoint;
-       }
+           exports.wrap = wrap; // Try/catch helper to minimize deoptimizations. Returns a completion
+           // record like context.tryEntries[i].completion. This interface could
+           // have been (and was previously) designed to take a closure to be
+           // invoked without arguments, but in all the cases we care about we
+           // already have an existing method we want to call, so there's no need
+           // to create a new function object. We can even get away with assuming
+           // the method takes exactly one argument, since that happens to be true
+           // in every case, so we don't have to touch the arguments object. The
+           // only additional allocation required is the completion record, which
+           // has a stable shape and so hopefully should be cheap to allocate.
 
-       function centroidRingPointFirst(lambda, phi) {
-         lambda00$2 = lambda, phi00$2 = phi;
-         lambda *= radians, phi *= radians;
-         centroidStream.point = centroidRingPoint;
-         var cosPhi = cos(phi);
-         x0 = cosPhi * cos(lambda);
-         y0 = cosPhi * sin(lambda);
-         z0 = sin(phi);
-         centroidPointCartesian(x0, y0, z0);
-       }
+           function tryCatch(fn, obj, arg) {
+             try {
+               return {
+                 type: "normal",
+                 arg: fn.call(obj, arg)
+               };
+             } catch (err) {
+               return {
+                 type: "throw",
+                 arg: err
+               };
+             }
+           }
 
-       function centroidRingPoint(lambda, phi) {
-         lambda *= radians, phi *= radians;
-         var cosPhi = cos(phi),
-             x = cosPhi * cos(lambda),
-             y = cosPhi * sin(lambda),
-             z = sin(phi),
-             cx = y0 * z - z0 * y,
-             cy = z0 * x - x0 * z,
-             cz = x0 * y - y0 * x,
-             m = sqrt(cx * cx + cy * cy + cz * cz),
-             w = asin(m), // line weight = angle
-             v = m && -w / m; // area weight multiplier
-         X2 += v * cx;
-         Y2 += v * cy;
-         Z2 += v * cz;
-         W1 += w;
-         X1 += w * (x0 + (x0 = x));
-         Y1 += w * (y0 + (y0 = y));
-         Z1 += w * (z0 + (z0 = z));
-         centroidPointCartesian(x0, y0, z0);
-       }
+           var GenStateSuspendedStart = "suspendedStart";
+           var GenStateSuspendedYield = "suspendedYield";
+           var GenStateExecuting = "executing";
+           var GenStateCompleted = "completed"; // Returning this object from the innerFn has the same effect as
+           // breaking out of the dispatch switch statement.
 
-       function d3_geoCentroid(object) {
-         W0 = W1 =
-         X0 = Y0 = Z0 =
-         X1 = Y1 = Z1 =
-         X2 = Y2 = Z2 = 0;
-         d3_geoStream(object, centroidStream);
+           var ContinueSentinel = {}; // Dummy constructor functions that we use as the .constructor and
+           // .constructor.prototype properties for functions that return Generator
+           // objects. For full spec compliance, you may wish to configure your
+           // minifier not to mangle the names of these two functions.
 
-         var x = X2,
-             y = Y2,
-             z = Z2,
-             m = x * x + y * y + z * z;
+           function Generator() {}
 
-         // If the area-weighted ccentroid is undefined, fall back to length-weighted ccentroid.
-         if (m < epsilon2) {
-           x = X1, y = Y1, z = Z1;
-           // If the feature has zero length, fall back to arithmetic mean of point vectors.
-           if (W1 < epsilon) x = X0, y = Y0, z = Z0;
-           m = x * x + y * y + z * z;
-           // If the feature still has an undefined ccentroid, then return.
-           if (m < epsilon2) return [NaN, NaN];
-         }
+           function GeneratorFunction() {}
 
-         return [atan2(y, x) * degrees, asin(z / sqrt(m)) * degrees];
-       }
+           function GeneratorFunctionPrototype() {} // This is a polyfill for %IteratorPrototype% for environments that
+           // don't natively support it.
 
-       function compose(a, b) {
 
-         function compose(x, y) {
-           return x = a(x, y), b(x[0], x[1]);
-         }
+           var IteratorPrototype = {};
 
-         if (a.invert && b.invert) compose.invert = function(x, y) {
-           return x = b.invert(x, y), x && a.invert(x[0], x[1]);
-         };
+           IteratorPrototype[iteratorSymbol] = function () {
+             return this;
+           };
 
-         return compose;
-       }
+           var getProto = Object.getPrototypeOf;
+           var NativeIteratorPrototype = getProto && getProto(getProto(values([])));
 
-       function rotationIdentity(lambda, phi) {
-         return [abs$2(lambda) > pi ? lambda + Math.round(-lambda / tau) * tau : lambda, phi];
-       }
+           if (NativeIteratorPrototype && NativeIteratorPrototype !== Op && hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {
+             // This environment has a native %IteratorPrototype%; use it instead
+             // of the polyfill.
+             IteratorPrototype = NativeIteratorPrototype;
+           }
 
-       rotationIdentity.invert = rotationIdentity;
+           var Gp = GeneratorFunctionPrototype.prototype = Generator.prototype = Object.create(IteratorPrototype);
+           GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;
+           GeneratorFunctionPrototype.constructor = GeneratorFunction;
+           GeneratorFunction.displayName = define(GeneratorFunctionPrototype, toStringTagSymbol, "GeneratorFunction"); // Helper for defining the .next, .throw, and .return methods of the
+           // Iterator interface in terms of a single ._invoke method.
 
-       function rotateRadians(deltaLambda, deltaPhi, deltaGamma) {
-         return (deltaLambda %= tau) ? (deltaPhi || deltaGamma ? compose(rotationLambda(deltaLambda), rotationPhiGamma(deltaPhi, deltaGamma))
-           : rotationLambda(deltaLambda))
-           : (deltaPhi || deltaGamma ? rotationPhiGamma(deltaPhi, deltaGamma)
-           : rotationIdentity);
-       }
+           function defineIteratorMethods(prototype) {
+             ["next", "throw", "return"].forEach(function (method) {
+               define(prototype, method, function (arg) {
+                 return this._invoke(method, arg);
+               });
+             });
+           }
 
-       function forwardRotationLambda(deltaLambda) {
-         return function(lambda, phi) {
-           return lambda += deltaLambda, [lambda > pi ? lambda - tau : lambda < -pi ? lambda + tau : lambda, phi];
-         };
-       }
+           exports.isGeneratorFunction = function (genFun) {
+             var ctor = typeof genFun === "function" && genFun.constructor;
+             return ctor ? ctor === GeneratorFunction || // For the native GeneratorFunction constructor, the best we can
+             // do is to check its .name property.
+             (ctor.displayName || ctor.name) === "GeneratorFunction" : false;
+           };
 
-       function rotationLambda(deltaLambda) {
-         var rotation = forwardRotationLambda(deltaLambda);
-         rotation.invert = forwardRotationLambda(-deltaLambda);
-         return rotation;
-       }
+           exports.mark = function (genFun) {
+             if (Object.setPrototypeOf) {
+               Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);
+             } else {
+               genFun.__proto__ = GeneratorFunctionPrototype;
+               define(genFun, toStringTagSymbol, "GeneratorFunction");
+             }
 
-       function rotationPhiGamma(deltaPhi, deltaGamma) {
-         var cosDeltaPhi = cos(deltaPhi),
-             sinDeltaPhi = sin(deltaPhi),
-             cosDeltaGamma = cos(deltaGamma),
-             sinDeltaGamma = sin(deltaGamma);
+             genFun.prototype = Object.create(Gp);
+             return genFun;
+           }; // Within the body of any async function, `await x` is transformed to
+           // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test
+           // `hasOwn.call(value, "__await")` to determine if the yielded value is
+           // meant to be awaited.
 
-         function rotation(lambda, phi) {
-           var cosPhi = cos(phi),
-               x = cos(lambda) * cosPhi,
-               y = sin(lambda) * cosPhi,
-               z = sin(phi),
-               k = z * cosDeltaPhi + x * sinDeltaPhi;
-           return [
-             atan2(y * cosDeltaGamma - k * sinDeltaGamma, x * cosDeltaPhi - z * sinDeltaPhi),
-             asin(k * cosDeltaGamma + y * sinDeltaGamma)
-           ];
-         }
 
-         rotation.invert = function(lambda, phi) {
-           var cosPhi = cos(phi),
-               x = cos(lambda) * cosPhi,
-               y = sin(lambda) * cosPhi,
-               z = sin(phi),
-               k = z * cosDeltaGamma - y * sinDeltaGamma;
-           return [
-             atan2(y * cosDeltaGamma + z * sinDeltaGamma, x * cosDeltaPhi + k * sinDeltaPhi),
-             asin(k * cosDeltaPhi - x * sinDeltaPhi)
-           ];
-         };
+           exports.awrap = function (arg) {
+             return {
+               __await: arg
+             };
+           };
 
-         return rotation;
-       }
+           function AsyncIterator(generator, PromiseImpl) {
+             function invoke(method, arg, resolve, reject) {
+               var record = tryCatch(generator[method], generator, arg);
 
-       function rotation(rotate) {
-         rotate = rotateRadians(rotate[0] * radians, rotate[1] * radians, rotate.length > 2 ? rotate[2] * radians : 0);
+               if (record.type === "throw") {
+                 reject(record.arg);
+               } else {
+                 var result = record.arg;
+                 var value = result.value;
+
+                 if (value && _typeof(value) === "object" && hasOwn.call(value, "__await")) {
+                   return PromiseImpl.resolve(value.__await).then(function (value) {
+                     invoke("next", value, resolve, reject);
+                   }, function (err) {
+                     invoke("throw", err, resolve, reject);
+                   });
+                 }
 
-         function forward(coordinates) {
-           coordinates = rotate(coordinates[0] * radians, coordinates[1] * radians);
-           return coordinates[0] *= degrees, coordinates[1] *= degrees, coordinates;
-         }
+                 return PromiseImpl.resolve(value).then(function (unwrapped) {
+                   // When a yielded Promise is resolved, its final value becomes
+                   // the .value of the Promise<{value,done}> result for the
+                   // current iteration.
+                   result.value = unwrapped;
+                   resolve(result);
+                 }, function (error) {
+                   // If a rejected Promise was yielded, throw the rejection back
+                   // into the async generator function so it can be handled there.
+                   return invoke("throw", error, resolve, reject);
+                 });
+               }
+             }
 
-         forward.invert = function(coordinates) {
-           coordinates = rotate.invert(coordinates[0] * radians, coordinates[1] * radians);
-           return coordinates[0] *= degrees, coordinates[1] *= degrees, coordinates;
-         };
+             var previousPromise;
 
-         return forward;
-       }
+             function enqueue(method, arg) {
+               function callInvokeWithMethodAndArg() {
+                 return new PromiseImpl(function (resolve, reject) {
+                   invoke(method, arg, resolve, reject);
+                 });
+               }
 
-       // Generates a circle centered at [0°, 0°], with a given radius and precision.
-       function circleStream(stream, radius, delta, direction, t0, t1) {
-         if (!delta) return;
-         var cosRadius = cos(radius),
-             sinRadius = sin(radius),
-             step = direction * delta;
-         if (t0 == null) {
-           t0 = radius + direction * tau;
-           t1 = radius - step / 2;
-         } else {
-           t0 = circleRadius(cosRadius, t0);
-           t1 = circleRadius(cosRadius, t1);
-           if (direction > 0 ? t0 < t1 : t0 > t1) t0 += direction * tau;
-         }
-         for (var point, t = t0; direction > 0 ? t > t1 : t < t1; t -= step) {
-           point = spherical([cosRadius, -sinRadius * cos(t), -sinRadius * sin(t)]);
-           stream.point(point[0], point[1]);
-         }
-       }
+               return previousPromise = // If enqueue has been called before, then we want to wait until
+               // all previous Promises have been resolved before calling invoke,
+               // so that results are always delivered in the correct order. If
+               // enqueue has not been called before, then it is important to
+               // call invoke immediately, without waiting on a callback to fire,
+               // so that the async generator function has the opportunity to do
+               // any necessary setup in a predictable way. This predictability
+               // is why the Promise constructor synchronously invokes its
+               // executor callback, and why async functions synchronously
+               // execute code before the first await. Since we implement simple
+               // async functions in terms of async generators, it is especially
+               // important to get this right, even though it requires care.
+               previousPromise ? previousPromise.then(callInvokeWithMethodAndArg, // Avoid propagating failures to Promises returned by later
+               // invocations of the iterator.
+               callInvokeWithMethodAndArg) : callInvokeWithMethodAndArg();
+             } // Define the unified helper method that is used to implement .next,
+             // .throw, and .return (see defineIteratorMethods).
 
-       // Returns the signed angle of a cartesian point relative to [cosRadius, 0, 0].
-       function circleRadius(cosRadius, point) {
-         point = cartesian(point), point[0] -= cosRadius;
-         cartesianNormalizeInPlace(point);
-         var radius = acos(-point[1]);
-         return ((-point[2] < 0 ? -radius : radius) + tau - epsilon) % tau;
-       }
 
-       function clipBuffer() {
-         var lines = [],
-             line;
-         return {
-           point: function(x, y, m) {
-             line.push([x, y, m]);
-           },
-           lineStart: function() {
-             lines.push(line = []);
-           },
-           lineEnd: noop$2,
-           rejoin: function() {
-             if (lines.length > 1) lines.push(lines.pop().concat(lines.shift()));
-           },
-           result: function() {
-             var result = lines;
-             lines = [];
-             line = null;
-             return result;
+             this._invoke = enqueue;
            }
-         };
-       }
 
-       function pointEqual(a, b) {
-         return abs$2(a[0] - b[0]) < epsilon && abs$2(a[1] - b[1]) < epsilon;
-       }
+           defineIteratorMethods(AsyncIterator.prototype);
 
-       function Intersection(point, points, other, entry) {
-         this.x = point;
-         this.z = points;
-         this.o = other; // another intersection
-         this.e = entry; // is an entry?
-         this.v = false; // visited
-         this.n = this.p = null; // next & previous
-       }
+           AsyncIterator.prototype[asyncIteratorSymbol] = function () {
+             return this;
+           };
 
-       // A generalized polygon clipping algorithm: given a polygon that has been cut
-       // into its visible line segments, and rejoins the segments by interpolating
-       // along the clip edge.
-       function clipRejoin(segments, compareIntersection, startInside, interpolate, stream) {
-         var subject = [],
-             clip = [],
-             i,
-             n;
+           exports.AsyncIterator = AsyncIterator; // Note that simple async functions are implemented on top of
+           // AsyncIterator objects; they just return a Promise for the value of
+           // the final result produced by the iterator.
 
-         segments.forEach(function(segment) {
-           if ((n = segment.length - 1) <= 0) return;
-           var n, p0 = segment[0], p1 = segment[n], x;
+           exports.async = function (innerFn, outerFn, self, tryLocsList, PromiseImpl) {
+             if (PromiseImpl === void 0) PromiseImpl = Promise;
+             var iter = new AsyncIterator(wrap(innerFn, outerFn, self, tryLocsList), PromiseImpl);
+             return exports.isGeneratorFunction(outerFn) ? iter // If outerFn is a generator, return the full iterator.
+             : iter.next().then(function (result) {
+               return result.done ? result.value : iter.next();
+             });
+           };
 
-           if (pointEqual(p0, p1)) {
-             if (!p0[2] && !p1[2]) {
-               stream.lineStart();
-               for (i = 0; i < n; ++i) stream.point((p0 = segment[i])[0], p0[1]);
-               stream.lineEnd();
-               return;
-             }
-             // handle degenerate cases by moving the point
-             p1[0] += 2 * epsilon;
-           }
+           function makeInvokeMethod(innerFn, self, context) {
+             var state = GenStateSuspendedStart;
+             return function invoke(method, arg) {
+               if (state === GenStateExecuting) {
+                 throw new Error("Generator is already running");
+               }
 
-           subject.push(x = new Intersection(p0, segment, null, true));
-           clip.push(x.o = new Intersection(p0, null, x, false));
-           subject.push(x = new Intersection(p1, segment, null, false));
-           clip.push(x.o = new Intersection(p1, null, x, true));
-         });
+               if (state === GenStateCompleted) {
+                 if (method === "throw") {
+                   throw arg;
+                 } // Be forgiving, per 25.3.3.3.3 of the spec:
+                 // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume
 
-         if (!subject.length) return;
 
-         clip.sort(compareIntersection);
-         link(subject);
-         link(clip);
+                 return doneResult();
+               }
 
-         for (i = 0, n = clip.length; i < n; ++i) {
-           clip[i].e = startInside = !startInside;
-         }
+               context.method = method;
+               context.arg = arg;
 
-         var start = subject[0],
-             points,
-             point;
+               while (true) {
+                 var delegate = context.delegate;
 
-         while (1) {
-           // Find first unvisited intersection.
-           var current = start,
-               isSubject = true;
-           while (current.v) if ((current = current.n) === start) return;
-           points = current.z;
-           stream.lineStart();
-           do {
-             current.v = current.o.v = true;
-             if (current.e) {
-               if (isSubject) {
-                 for (i = 0, n = points.length; i < n; ++i) stream.point((point = points[i])[0], point[1]);
-               } else {
-                 interpolate(current.x, current.n.x, 1, stream);
+                 if (delegate) {
+                   var delegateResult = maybeInvokeDelegate(delegate, context);
+
+                   if (delegateResult) {
+                     if (delegateResult === ContinueSentinel) continue;
+                     return delegateResult;
+                   }
+                 }
+
+                 if (context.method === "next") {
+                   // Setting context._sent for legacy support of Babel's
+                   // function.sent implementation.
+                   context.sent = context._sent = context.arg;
+                 } else if (context.method === "throw") {
+                   if (state === GenStateSuspendedStart) {
+                     state = GenStateCompleted;
+                     throw context.arg;
+                   }
+
+                   context.dispatchException(context.arg);
+                 } else if (context.method === "return") {
+                   context.abrupt("return", context.arg);
+                 }
+
+                 state = GenStateExecuting;
+                 var record = tryCatch(innerFn, self, context);
+
+                 if (record.type === "normal") {
+                   // If an exception is thrown from innerFn, we leave state ===
+                   // GenStateExecuting and loop back for another invocation.
+                   state = context.done ? GenStateCompleted : GenStateSuspendedYield;
+
+                   if (record.arg === ContinueSentinel) {
+                     continue;
+                   }
+
+                   return {
+                     value: record.arg,
+                     done: context.done
+                   };
+                 } else if (record.type === "throw") {
+                   state = GenStateCompleted; // Dispatch the exception by looping back around to the
+                   // context.dispatchException(context.arg) call above.
+
+                   context.method = "throw";
+                   context.arg = record.arg;
+                 }
                }
-               current = current.n;
-             } else {
-               if (isSubject) {
-                 points = current.p.z;
-                 for (i = points.length - 1; i >= 0; --i) stream.point((point = points[i])[0], point[1]);
-               } else {
-                 interpolate(current.x, current.p.x, -1, stream);
+             };
+           } // Call delegate.iterator[context.method](context.arg) and handle the
+           // result, either by returning a { value, done } result from the
+           // delegate iterator, or by modifying context.method and context.arg,
+           // setting context.delegate to null, and returning the ContinueSentinel.
+
+
+           function maybeInvokeDelegate(delegate, context) {
+             var method = delegate.iterator[context.method];
+
+             if (method === undefined$1) {
+               // A .throw or .return when the delegate iterator has no .throw
+               // method always terminates the yield* loop.
+               context.delegate = null;
+
+               if (context.method === "throw") {
+                 // Note: ["return"] must be used for ES3 parsing compatibility.
+                 if (delegate.iterator["return"]) {
+                   // If the delegate iterator has a return method, give it a
+                   // chance to clean up.
+                   context.method = "return";
+                   context.arg = undefined$1;
+                   maybeInvokeDelegate(delegate, context);
+
+                   if (context.method === "throw") {
+                     // If maybeInvokeDelegate(context) changed context.method from
+                     // "return" to "throw", let that override the TypeError below.
+                     return ContinueSentinel;
+                   }
+                 }
+
+                 context.method = "throw";
+                 context.arg = new TypeError("The iterator does not provide a 'throw' method");
                }
-               current = current.p;
+
+               return ContinueSentinel;
              }
-             current = current.o;
-             points = current.z;
-             isSubject = !isSubject;
-           } while (!current.v);
-           stream.lineEnd();
-         }
-       }
 
-       function link(array) {
-         if (!(n = array.length)) return;
-         var n,
-             i = 0,
-             a = array[0],
-             b;
-         while (++i < n) {
-           a.n = b = array[i];
-           b.p = a;
-           a = b;
-         }
-         a.n = b = array[0];
-         b.p = a;
-       }
+             var record = tryCatch(method, delegate.iterator, context.arg);
 
-       var sum = adder();
+             if (record.type === "throw") {
+               context.method = "throw";
+               context.arg = record.arg;
+               context.delegate = null;
+               return ContinueSentinel;
+             }
 
-       function longitude(point) {
-         if (abs$2(point[0]) <= pi)
-           return point[0];
-         else
-           return sign$2(point[0]) * ((abs$2(point[0]) + pi) % tau - pi);
-       }
+             var info = record.arg;
 
-       function polygonContains(polygon, point) {
-         var lambda = longitude(point),
-             phi = point[1],
-             sinPhi = sin(phi),
-             normal = [sin(lambda), -cos(lambda), 0],
-             angle = 0,
-             winding = 0;
+             if (!info) {
+               context.method = "throw";
+               context.arg = new TypeError("iterator result is not an object");
+               context.delegate = null;
+               return ContinueSentinel;
+             }
 
-         sum.reset();
+             if (info.done) {
+               // Assign the result of the finished delegate to the temporary
+               // variable specified by delegate.resultName (see delegateYield).
+               context[delegate.resultName] = info.value; // Resume execution at the desired location (see delegateYield).
 
-         if (sinPhi === 1) phi = halfPi + epsilon;
-         else if (sinPhi === -1) phi = -halfPi - epsilon;
+               context.next = delegate.nextLoc; // If context.method was "throw" but the delegate handled the
+               // exception, let the outer generator proceed normally. If
+               // context.method was "next", forget context.arg since it has been
+               // "consumed" by the delegate iterator. If context.method was
+               // "return", allow the original .return call to continue in the
+               // outer generator.
 
-         for (var i = 0, n = polygon.length; i < n; ++i) {
-           if (!(m = (ring = polygon[i]).length)) continue;
-           var ring,
-               m,
-               point0 = ring[m - 1],
-               lambda0 = longitude(point0),
-               phi0 = point0[1] / 2 + quarterPi,
-               sinPhi0 = sin(phi0),
-               cosPhi0 = cos(phi0);
+               if (context.method !== "return") {
+                 context.method = "next";
+                 context.arg = undefined$1;
+               }
+             } else {
+               // Re-yield the result returned by the delegate method.
+               return info;
+             } // The delegate iterator is finished, so forget it and continue with
+             // the outer generator.
 
-           for (var j = 0; j < m; ++j, lambda0 = lambda1, sinPhi0 = sinPhi1, cosPhi0 = cosPhi1, point0 = point1) {
-             var point1 = ring[j],
-                 lambda1 = longitude(point1),
-                 phi1 = point1[1] / 2 + quarterPi,
-                 sinPhi1 = sin(phi1),
-                 cosPhi1 = cos(phi1),
-                 delta = lambda1 - lambda0,
-                 sign = delta >= 0 ? 1 : -1,
-                 absDelta = sign * delta,
-                 antimeridian = absDelta > pi,
-                 k = sinPhi0 * sinPhi1;
 
-             sum.add(atan2(k * sign * sin(absDelta), cosPhi0 * cosPhi1 + k * cos(absDelta)));
-             angle += antimeridian ? delta + sign * tau : delta;
+             context.delegate = null;
+             return ContinueSentinel;
+           } // Define Generator.prototype.{next,throw,return} in terms of the
+           // unified ._invoke helper method.
 
-             // Are the longitudes either side of the point’s meridian (lambda),
-             // and are the latitudes smaller than the parallel (phi)?
-             if (antimeridian ^ lambda0 >= lambda ^ lambda1 >= lambda) {
-               var arc = cartesianCross(cartesian(point0), cartesian(point1));
-               cartesianNormalizeInPlace(arc);
-               var intersection = cartesianCross(normal, arc);
-               cartesianNormalizeInPlace(intersection);
-               var phiArc = (antimeridian ^ delta >= 0 ? -1 : 1) * asin(intersection[2]);
-               if (phi > phiArc || phi === phiArc && (arc[0] || arc[1])) {
-                 winding += antimeridian ^ delta >= 0 ? 1 : -1;
-               }
-             }
-           }
-         }
 
-         // First, determine whether the South pole is inside or outside:
-         //
-         // It is inside if:
-         // * the polygon winds around it in a clockwise direction.
-         // * the polygon does not (cumulatively) wind around it, but has a negative
-         //   (counter-clockwise) area.
-         //
-         // Second, count the (signed) number of times a segment crosses a lambda
-         // from the point to the South pole.  If it is zero, then the point is the
-         // same side as the South pole.
+           defineIteratorMethods(Gp);
+           define(Gp, toStringTagSymbol, "Generator"); // A Generator should always return itself as the iterator object when the
+           // @@iterator function is called on it. Some browsers' implementations of the
+           // iterator prototype chain incorrectly implement this, causing the Generator
+           // object to not be returned from this call. This ensures that doesn't happen.
+           // See https://github.com/facebook/regenerator/issues/274 for more details.
 
-         return (angle < -epsilon || angle < epsilon && sum < -epsilon) ^ (winding & 1);
-       }
+           Gp[iteratorSymbol] = function () {
+             return this;
+           };
 
-       function d3_ascending(a, b) {
-         return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
-       }
+           Gp.toString = function () {
+             return "[object Generator]";
+           };
 
-       function d3_bisector(compare) {
-         if (compare.length === 1) compare = ascendingComparator(compare);
-         return {
-           left: function(a, x, lo, hi) {
-             if (lo == null) lo = 0;
-             if (hi == null) hi = a.length;
-             while (lo < hi) {
-               var mid = lo + hi >>> 1;
-               if (compare(a[mid], x) < 0) lo = mid + 1;
-               else hi = mid;
-             }
-             return lo;
-           },
-           right: function(a, x, lo, hi) {
-             if (lo == null) lo = 0;
-             if (hi == null) hi = a.length;
-             while (lo < hi) {
-               var mid = lo + hi >>> 1;
-               if (compare(a[mid], x) > 0) hi = mid;
-               else lo = mid + 1;
+           function pushTryEntry(locs) {
+             var entry = {
+               tryLoc: locs[0]
+             };
+
+             if (1 in locs) {
+               entry.catchLoc = locs[1];
              }
-             return lo;
-           }
-         };
-       }
 
-       function ascendingComparator(f) {
-         return function(d, x) {
-           return d3_ascending(f(d), x);
-         };
-       }
+             if (2 in locs) {
+               entry.finallyLoc = locs[2];
+               entry.afterLoc = locs[3];
+             }
 
-       var ascendingBisect = d3_bisector(d3_ascending);
-       var bisectRight = ascendingBisect.right;
+             this.tryEntries.push(entry);
+           }
 
-       function d3_descending(a, b) {
-         return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
-       }
+           function resetTryEntry(entry) {
+             var record = entry.completion || {};
+             record.type = "normal";
+             delete record.arg;
+             entry.completion = record;
+           }
 
-       function number(x) {
-         return x === null ? NaN : +x;
-       }
+           function Context(tryLocsList) {
+             // The root entry object (effectively a try statement without a catch
+             // or a finally block) gives us a place to store values thrown from
+             // locations where there is no enclosing try statement.
+             this.tryEntries = [{
+               tryLoc: "root"
+             }];
+             tryLocsList.forEach(pushTryEntry, this);
+             this.reset(true);
+           }
 
-       function range$1(start, stop, step) {
-         start = +start, stop = +stop, step = (n = arguments.length) < 2 ? (stop = start, start = 0, 1) : n < 3 ? 1 : +step;
+           exports.keys = function (object) {
+             var keys = [];
 
-         var i = -1,
-             n = Math.max(0, Math.ceil((stop - start) / step)) | 0,
-             range = new Array(n);
+             for (var key in object) {
+               keys.push(key);
+             }
 
-         while (++i < n) {
-           range[i] = start + i * step;
-         }
+             keys.reverse(); // Rather than returning an object with a next method, we keep
+             // things simple and return the next function itself.
 
-         return range;
-       }
+             return function next() {
+               while (keys.length) {
+                 var key = keys.pop();
 
-       var e10 = Math.sqrt(50),
-           e5 = Math.sqrt(10),
-           e2 = Math.sqrt(2);
+                 if (key in object) {
+                   next.value = key;
+                   next.done = false;
+                   return next;
+                 }
+               } // To avoid creating an additional object, we just hang the .value
+               // and .done properties off the next function object itself. This
+               // also ensures that the minifier will not anonymize the function.
 
-       function ticks(start, stop, count) {
-         var reverse,
-             i = -1,
-             n,
-             ticks,
-             step;
 
-         stop = +stop, start = +start, count = +count;
-         if (start === stop && count > 0) return [start];
-         if (reverse = stop < start) n = start, start = stop, stop = n;
-         if ((step = tickIncrement(start, stop, count)) === 0 || !isFinite(step)) return [];
+               next.done = true;
+               return next;
+             };
+           };
 
-         if (step > 0) {
-           start = Math.ceil(start / step);
-           stop = Math.floor(stop / step);
-           ticks = new Array(n = Math.ceil(stop - start + 1));
-           while (++i < n) ticks[i] = (start + i) * step;
-         } else {
-           start = Math.floor(start * step);
-           stop = Math.ceil(stop * step);
-           ticks = new Array(n = Math.ceil(start - stop + 1));
-           while (++i < n) ticks[i] = (start - i) / step;
-         }
+           function values(iterable) {
+             if (iterable) {
+               var iteratorMethod = iterable[iteratorSymbol];
 
-         if (reverse) ticks.reverse();
+               if (iteratorMethod) {
+                 return iteratorMethod.call(iterable);
+               }
 
-         return ticks;
-       }
+               if (typeof iterable.next === "function") {
+                 return iterable;
+               }
 
-       function tickIncrement(start, stop, count) {
-         var step = (stop - start) / Math.max(0, count),
-             power = Math.floor(Math.log(step) / Math.LN10),
-             error = step / Math.pow(10, power);
-         return power >= 0
-             ? (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1) * Math.pow(10, power)
-             : -Math.pow(10, -power) / (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1);
-       }
+               if (!isNaN(iterable.length)) {
+                 var i = -1,
+                     next = function next() {
+                   while (++i < iterable.length) {
+                     if (hasOwn.call(iterable, i)) {
+                       next.value = iterable[i];
+                       next.done = false;
+                       return next;
+                     }
+                   }
 
-       function tickStep(start, stop, count) {
-         var step0 = Math.abs(stop - start) / Math.max(0, count),
-             step1 = Math.pow(10, Math.floor(Math.log(step0) / Math.LN10)),
-             error = step0 / step1;
-         if (error >= e10) step1 *= 10;
-         else if (error >= e5) step1 *= 5;
-         else if (error >= e2) step1 *= 2;
-         return stop < start ? -step1 : step1;
-       }
+                   next.value = undefined$1;
+                   next.done = true;
+                   return next;
+                 };
 
-       function threshold(values, p, valueof) {
-         if (valueof == null) valueof = number;
-         if (!(n = values.length)) return;
-         if ((p = +p) <= 0 || n < 2) return +valueof(values[0], 0, values);
-         if (p >= 1) return +valueof(values[n - 1], n - 1, values);
-         var n,
-             i = (n - 1) * p,
-             i0 = Math.floor(i),
-             value0 = +valueof(values[i0], i0, values),
-             value1 = +valueof(values[i0 + 1], i0 + 1, values);
-         return value0 + (value1 - value0) * (i - i0);
-       }
+                 return next.next = next;
+               }
+             } // Return an iterator with no values.
 
-       function d3_median(values, valueof) {
-         var n = values.length,
-             i = -1,
-             value,
-             numbers = [];
 
-         if (valueof == null) {
-           while (++i < n) {
-             if (!isNaN(value = number(values[i]))) {
-               numbers.push(value);
-             }
+             return {
+               next: doneResult
+             };
            }
-         }
 
-         else {
-           while (++i < n) {
-             if (!isNaN(value = number(valueof(values[i], i, values)))) {
-               numbers.push(value);
-             }
+           exports.values = values;
+
+           function doneResult() {
+             return {
+               value: undefined$1,
+               done: true
+             };
            }
-         }
 
-         return threshold(numbers.sort(d3_ascending), 0.5);
-       }
+           Context.prototype = {
+             constructor: Context,
+             reset: function reset(skipTempReset) {
+               this.prev = 0;
+               this.next = 0; // Resetting context._sent for legacy support of Babel's
+               // function.sent implementation.
 
-       function merge(arrays) {
-         var n = arrays.length,
-             m,
-             i = -1,
-             j = 0,
-             merged,
-             array;
+               this.sent = this._sent = undefined$1;
+               this.done = false;
+               this.delegate = null;
+               this.method = "next";
+               this.arg = undefined$1;
+               this.tryEntries.forEach(resetTryEntry);
 
-         while (++i < n) j += arrays[i].length;
-         merged = new Array(j);
+               if (!skipTempReset) {
+                 for (var name in this) {
+                   // Not sure about the optimal order of these conditions:
+                   if (name.charAt(0) === "t" && hasOwn.call(this, name) && !isNaN(+name.slice(1))) {
+                     this[name] = undefined$1;
+                   }
+                 }
+               }
+             },
+             stop: function stop() {
+               this.done = true;
+               var rootEntry = this.tryEntries[0];
+               var rootRecord = rootEntry.completion;
 
-         while (--n >= 0) {
-           array = arrays[n];
-           m = array.length;
-           while (--m >= 0) {
-             merged[--j] = array[m];
-           }
-         }
+               if (rootRecord.type === "throw") {
+                 throw rootRecord.arg;
+               }
 
-         return merged;
-       }
+               return this.rval;
+             },
+             dispatchException: function dispatchException(exception) {
+               if (this.done) {
+                 throw exception;
+               }
 
-       function clip(pointVisible, clipLine, interpolate, start) {
-         return function(sink) {
-           var line = clipLine(sink),
-               ringBuffer = clipBuffer(),
-               ringSink = clipLine(ringBuffer),
-               polygonStarted = false,
-               polygon,
-               segments,
-               ring;
+               var context = this;
 
-           var clip = {
-             point: point,
-             lineStart: lineStart,
-             lineEnd: lineEnd,
-             polygonStart: function() {
-               clip.point = pointRing;
-               clip.lineStart = ringStart;
-               clip.lineEnd = ringEnd;
-               segments = [];
-               polygon = [];
-             },
-             polygonEnd: function() {
-               clip.point = point;
-               clip.lineStart = lineStart;
-               clip.lineEnd = lineEnd;
-               segments = merge(segments);
-               var startInside = polygonContains(polygon, start);
-               if (segments.length) {
-                 if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
-                 clipRejoin(segments, compareIntersection, startInside, interpolate, sink);
-               } else if (startInside) {
-                 if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
-                 sink.lineStart();
-                 interpolate(null, null, 1, sink);
-                 sink.lineEnd();
-               }
-               if (polygonStarted) sink.polygonEnd(), polygonStarted = false;
-               segments = polygon = null;
-             },
-             sphere: function() {
-               sink.polygonStart();
-               sink.lineStart();
-               interpolate(null, null, 1, sink);
-               sink.lineEnd();
-               sink.polygonEnd();
-             }
-           };
+               function handle(loc, caught) {
+                 record.type = "throw";
+                 record.arg = exception;
+                 context.next = loc;
 
-           function point(lambda, phi) {
-             if (pointVisible(lambda, phi)) sink.point(lambda, phi);
-           }
+                 if (caught) {
+                   // If the dispatched exception was caught by a catch block,
+                   // then let that catch block handle the exception normally.
+                   context.method = "next";
+                   context.arg = undefined$1;
+                 }
 
-           function pointLine(lambda, phi) {
-             line.point(lambda, phi);
-           }
+                 return !!caught;
+               }
 
-           function lineStart() {
-             clip.point = pointLine;
-             line.lineStart();
-           }
+               for (var i = this.tryEntries.length - 1; i >= 0; --i) {
+                 var entry = this.tryEntries[i];
+                 var record = entry.completion;
 
-           function lineEnd() {
-             clip.point = point;
-             line.lineEnd();
-           }
+                 if (entry.tryLoc === "root") {
+                   // Exception thrown outside of any try block that could handle
+                   // it, so set the completion value of the entire function to
+                   // throw the exception.
+                   return handle("end");
+                 }
 
-           function pointRing(lambda, phi) {
-             ring.push([lambda, phi]);
-             ringSink.point(lambda, phi);
-           }
+                 if (entry.tryLoc <= this.prev) {
+                   var hasCatch = hasOwn.call(entry, "catchLoc");
+                   var hasFinally = hasOwn.call(entry, "finallyLoc");
 
-           function ringStart() {
-             ringSink.lineStart();
-             ring = [];
-           }
+                   if (hasCatch && hasFinally) {
+                     if (this.prev < entry.catchLoc) {
+                       return handle(entry.catchLoc, true);
+                     } else if (this.prev < entry.finallyLoc) {
+                       return handle(entry.finallyLoc);
+                     }
+                   } else if (hasCatch) {
+                     if (this.prev < entry.catchLoc) {
+                       return handle(entry.catchLoc, true);
+                     }
+                   } else if (hasFinally) {
+                     if (this.prev < entry.finallyLoc) {
+                       return handle(entry.finallyLoc);
+                     }
+                   } else {
+                     throw new Error("try statement without catch or finally");
+                   }
+                 }
+               }
+             },
+             abrupt: function abrupt(type, arg) {
+               for (var i = this.tryEntries.length - 1; i >= 0; --i) {
+                 var entry = this.tryEntries[i];
 
-           function ringEnd() {
-             pointRing(ring[0][0], ring[0][1]);
-             ringSink.lineEnd();
+                 if (entry.tryLoc <= this.prev && hasOwn.call(entry, "finallyLoc") && this.prev < entry.finallyLoc) {
+                   var finallyEntry = entry;
+                   break;
+                 }
+               }
 
-             var clean = ringSink.clean(),
-                 ringSegments = ringBuffer.result(),
-                 i, n = ringSegments.length, m,
-                 segment,
-                 point;
+               if (finallyEntry && (type === "break" || type === "continue") && finallyEntry.tryLoc <= arg && arg <= finallyEntry.finallyLoc) {
+                 // Ignore the finally entry if control is not jumping to a
+                 // location outside the try/catch block.
+                 finallyEntry = null;
+               }
 
-             ring.pop();
-             polygon.push(ring);
-             ring = null;
+               var record = finallyEntry ? finallyEntry.completion : {};
+               record.type = type;
+               record.arg = arg;
 
-             if (!n) return;
+               if (finallyEntry) {
+                 this.method = "next";
+                 this.next = finallyEntry.finallyLoc;
+                 return ContinueSentinel;
+               }
 
-             // No intersections.
-             if (clean & 1) {
-               segment = ringSegments[0];
-               if ((m = segment.length - 1) > 0) {
-                 if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
-                 sink.lineStart();
-                 for (i = 0; i < m; ++i) sink.point((point = segment[i])[0], point[1]);
-                 sink.lineEnd();
+               return this.complete(record);
+             },
+             complete: function complete(record, afterLoc) {
+               if (record.type === "throw") {
+                 throw record.arg;
                }
-               return;
-             }
 
-             // Rejoin connected segments.
-             // TODO reuse ringBuffer.rejoin()?
-             if (n > 1 && clean & 2) ringSegments.push(ringSegments.pop().concat(ringSegments.shift()));
+               if (record.type === "break" || record.type === "continue") {
+                 this.next = record.arg;
+               } else if (record.type === "return") {
+                 this.rval = this.arg = record.arg;
+                 this.method = "return";
+                 this.next = "end";
+               } else if (record.type === "normal" && afterLoc) {
+                 this.next = afterLoc;
+               }
 
-             segments.push(ringSegments.filter(validSegment));
-           }
+               return ContinueSentinel;
+             },
+             finish: function finish(finallyLoc) {
+               for (var i = this.tryEntries.length - 1; i >= 0; --i) {
+                 var entry = this.tryEntries[i];
+
+                 if (entry.finallyLoc === finallyLoc) {
+                   this.complete(entry.completion, entry.afterLoc);
+                   resetTryEntry(entry);
+                   return ContinueSentinel;
+                 }
+               }
+             },
+             "catch": function _catch(tryLoc) {
+               for (var i = this.tryEntries.length - 1; i >= 0; --i) {
+                 var entry = this.tryEntries[i];
 
-           return clip;
-         };
-       }
+                 if (entry.tryLoc === tryLoc) {
+                   var record = entry.completion;
 
-       function validSegment(segment) {
-         return segment.length > 1;
-       }
+                   if (record.type === "throw") {
+                     var thrown = record.arg;
+                     resetTryEntry(entry);
+                   }
 
-       // Intersections are sorted along the clip edge. For both antimeridian cutting
-       // and circle clipping, the same comparison is used.
-       function compareIntersection(a, b) {
-         return ((a = a.x)[0] < 0 ? a[1] - halfPi - epsilon : halfPi - a[1])
-              - ((b = b.x)[0] < 0 ? b[1] - halfPi - epsilon : halfPi - b[1]);
-       }
+                   return thrown;
+                 }
+               } // The context.catch method must only be called with a location
+               // argument that corresponds to a known catch block.
 
-       var clipAntimeridian = clip(
-         function() { return true; },
-         clipAntimeridianLine,
-         clipAntimeridianInterpolate,
-         [-pi, -halfPi]
-       );
 
-       // Takes a line and cuts into visible segments. Return values: 0 - there were
-       // intersections or the line was empty; 1 - no intersections; 2 - there were
-       // intersections, and the first and last segments should be rejoined.
-       function clipAntimeridianLine(stream) {
-         var lambda0 = NaN,
-             phi0 = NaN,
-             sign0 = NaN,
-             clean; // no intersections
+               throw new Error("illegal catch attempt");
+             },
+             delegateYield: function delegateYield(iterable, resultName, nextLoc) {
+               this.delegate = {
+                 iterator: values(iterable),
+                 resultName: resultName,
+                 nextLoc: nextLoc
+               };
 
-         return {
-           lineStart: function() {
-             stream.lineStart();
-             clean = 1;
-           },
-           point: function(lambda1, phi1) {
-             var sign1 = lambda1 > 0 ? pi : -pi,
-                 delta = abs$2(lambda1 - lambda0);
-             if (abs$2(delta - pi) < epsilon) { // line crosses a pole
-               stream.point(lambda0, phi0 = (phi0 + phi1) / 2 > 0 ? halfPi : -halfPi);
-               stream.point(sign0, phi0);
-               stream.lineEnd();
-               stream.lineStart();
-               stream.point(sign1, phi0);
-               stream.point(lambda1, phi0);
-               clean = 0;
-             } else if (sign0 !== sign1 && delta >= pi) { // line crosses antimeridian
-               if (abs$2(lambda0 - sign0) < epsilon) lambda0 -= sign0 * epsilon; // handle degeneracies
-               if (abs$2(lambda1 - sign1) < epsilon) lambda1 -= sign1 * epsilon;
-               phi0 = clipAntimeridianIntersect(lambda0, phi0, lambda1, phi1);
-               stream.point(sign0, phi0);
-               stream.lineEnd();
-               stream.lineStart();
-               stream.point(sign1, phi0);
-               clean = 0;
+               if (this.method === "next") {
+                 // Deliberately forget the last sent value so that we don't
+                 // accidentally pass it on to the delegate.
+                 this.arg = undefined$1;
+               }
+
+               return ContinueSentinel;
              }
-             stream.point(lambda0 = lambda1, phi0 = phi1);
-             sign0 = sign1;
-           },
-           lineEnd: function() {
-             stream.lineEnd();
-             lambda0 = phi0 = NaN;
-           },
-           clean: function() {
-             return 2 - clean; // if intersections, rejoin first and last segments
-           }
-         };
-       }
+           }; // Regardless of whether this script is executing as a CommonJS module
+           // or not, return the runtime object so that we can declare the variable
+           // regeneratorRuntime in the outer scope, which allows this module to be
+           // injected easily by `bin/regenerator --include-runtime script.js`.
 
-       function clipAntimeridianIntersect(lambda0, phi0, lambda1, phi1) {
-         var cosPhi0,
-             cosPhi1,
-             sinLambda0Lambda1 = sin(lambda0 - lambda1);
-         return abs$2(sinLambda0Lambda1) > epsilon
-             ? atan((sin(phi0) * (cosPhi1 = cos(phi1)) * sin(lambda1)
-                 - sin(phi1) * (cosPhi0 = cos(phi0)) * sin(lambda0))
-                 / (cosPhi0 * cosPhi1 * sinLambda0Lambda1))
-             : (phi0 + phi1) / 2;
-       }
+           return exports;
+         }( // If this script is executing as a CommonJS module, use module.exports
+         // as the regeneratorRuntime namespace. Otherwise create a new empty
+         // object. Either way, the resulting object will be used to initialize
+         // the regeneratorRuntime variable at the top of this file.
+          module.exports );
 
-       function clipAntimeridianInterpolate(from, to, direction, stream) {
-         var phi;
-         if (from == null) {
-           phi = direction * halfPi;
-           stream.point(-pi, phi);
-           stream.point(0, phi);
-           stream.point(pi, phi);
-           stream.point(pi, 0);
-           stream.point(pi, -phi);
-           stream.point(0, -phi);
-           stream.point(-pi, -phi);
-           stream.point(-pi, 0);
-           stream.point(-pi, phi);
-         } else if (abs$2(from[0] - to[0]) > epsilon) {
-           var lambda = from[0] < to[0] ? pi : -pi;
-           phi = direction * lambda / 2;
-           stream.point(-lambda, phi);
-           stream.point(0, phi);
-           stream.point(lambda, phi);
-         } else {
-           stream.point(to[0], to[1]);
+         try {
+           regeneratorRuntime = runtime;
+         } catch (accidentalStrictMode) {
+           // This module should not be running in strict mode, so the above
+           // assignment should always work unless something is misconfigured. Just
+           // in case runtime.js accidentally runs in strict mode, we can escape
+           // strict mode using a global Function call. This could conceivably fail
+           // if a Content Security Policy forbids using Function, but in that case
+           // the proper solution is to fix the accidental strict mode problem. If
+           // you've misconfigured your bundler to force strict mode and applied a
+           // CSP to forbid Function, and you're not willing to fix either of those
+           // problems, please detail your unique predicament in a GitHub issue.
+           Function("r", "regeneratorRuntime = r")(runtime);
          }
+       });
+
+       var _marked = /*#__PURE__*/regeneratorRuntime.mark(numbers);
+
+       function number (x) {
+         return x === null ? NaN : +x;
        }
+       function numbers(values, valueof) {
+         var _iterator, _step, value, index, _iterator2, _step2, _value;
 
-       function clipCircle(radius) {
-         var cr = cos(radius),
-             delta = 6 * radians,
-             smallRadius = cr > 0,
-             notHemisphere = abs$2(cr) > epsilon; // TODO optimise for this common case
+         return regeneratorRuntime.wrap(function numbers$(_context) {
+           while (1) {
+             switch (_context.prev = _context.next) {
+               case 0:
+                 if (!(valueof === undefined)) {
+                   _context.next = 21;
+                   break;
+                 }
 
-         function interpolate(from, to, direction, stream) {
-           circleStream(stream, radius, delta, direction, from, to);
-         }
+                 _iterator = _createForOfIteratorHelper(values);
+                 _context.prev = 2;
 
-         function visible(lambda, phi) {
-           return cos(lambda) * cos(phi) > cr;
-         }
+                 _iterator.s();
 
-         // Takes a line and cuts into visible segments. Return values used for polygon
-         // clipping: 0 - there were intersections or the line was empty; 1 - no
-         // intersections 2 - there were intersections, and the first and last segments
-         // should be rejoined.
-         function clipLine(stream) {
-           var point0, // previous point
-               c0, // code for previous point
-               v0, // visibility of previous point
-               v00, // visibility of first point
-               clean; // no intersections
-           return {
-             lineStart: function() {
-               v00 = v0 = false;
-               clean = 1;
-             },
-             point: function(lambda, phi) {
-               var point1 = [lambda, phi],
-                   point2,
-                   v = visible(lambda, phi),
-                   c = smallRadius
-                     ? v ? 0 : code(lambda, phi)
-                     : v ? code(lambda + (lambda < 0 ? pi : -pi), phi) : 0;
-               if (!point0 && (v00 = v0 = v)) stream.lineStart();
-               if (v !== v0) {
-                 point2 = intersect(point0, point1);
-                 if (!point2 || pointEqual(point0, point2) || pointEqual(point1, point2))
-                   point1[2] = 1;
-               }
-               if (v !== v0) {
-                 clean = 0;
-                 if (v) {
-                   // outside going in
-                   stream.lineStart();
-                   point2 = intersect(point1, point0);
-                   stream.point(point2[0], point2[1]);
-                 } else {
-                   // inside going out
-                   point2 = intersect(point0, point1);
-                   stream.point(point2[0], point2[1], 2);
-                   stream.lineEnd();
+               case 4:
+                 if ((_step = _iterator.n()).done) {
+                   _context.next = 11;
+                   break;
                  }
-                 point0 = point2;
-               } else if (notHemisphere && point0 && smallRadius ^ v) {
-                 var t;
-                 // If the codes for two points are different, or are both zero,
-                 // and there this segment intersects with the small circle.
-                 if (!(c & c0) && (t = intersect(point1, point0, true))) {
-                   clean = 0;
-                   if (smallRadius) {
-                     stream.lineStart();
-                     stream.point(t[0][0], t[0][1]);
-                     stream.point(t[1][0], t[1][1]);
-                     stream.lineEnd();
-                   } else {
-                     stream.point(t[1][0], t[1][1]);
-                     stream.lineEnd();
-                     stream.lineStart();
-                     stream.point(t[0][0], t[0][1], 3);
-                   }
+
+                 value = _step.value;
+
+                 if (!(value != null && (value = +value) >= value)) {
+                   _context.next = 9;
+                   break;
                  }
-               }
-               if (v && (!point0 || !pointEqual(point0, point1))) {
-                 stream.point(point1[0], point1[1]);
-               }
-               point0 = point1, v0 = v, c0 = c;
-             },
-             lineEnd: function() {
-               if (v0) stream.lineEnd();
-               point0 = null;
-             },
-             // Rejoin first and last segments if there were intersections and the first
-             // and last points were visible.
-             clean: function() {
-               return clean | ((v00 && v0) << 1);
-             }
-           };
-         }
 
-         // Intersects the great circle between a and b with the clip circle.
-         function intersect(a, b, two) {
-           var pa = cartesian(a),
-               pb = cartesian(b);
+                 _context.next = 9;
+                 return value;
 
-           // We have two planes, n1.p = d1 and n2.p = d2.
-           // Find intersection line p(t) = c1 n1 + c2 n2 + t (n1 ⨯ n2).
-           var n1 = [1, 0, 0], // normal
-               n2 = cartesianCross(pa, pb),
-               n2n2 = cartesianDot(n2, n2),
-               n1n2 = n2[0], // cartesianDot(n1, n2),
-               determinant = n2n2 - n1n2 * n1n2;
+               case 9:
+                 _context.next = 4;
+                 break;
 
-           // Two polar points.
-           if (!determinant) return !two && a;
+               case 11:
+                 _context.next = 16;
+                 break;
 
-           var c1 =  cr * n2n2 / determinant,
-               c2 = -cr * n1n2 / determinant,
-               n1xn2 = cartesianCross(n1, n2),
-               A = cartesianScale(n1, c1),
-               B = cartesianScale(n2, c2);
-           cartesianAddInPlace(A, B);
+               case 13:
+                 _context.prev = 13;
+                 _context.t0 = _context["catch"](2);
 
-           // Solve |p(t)|^2 = 1.
-           var u = n1xn2,
-               w = cartesianDot(A, u),
-               uu = cartesianDot(u, u),
-               t2 = w * w - uu * (cartesianDot(A, A) - 1);
+                 _iterator.e(_context.t0);
 
-           if (t2 < 0) return;
+               case 16:
+                 _context.prev = 16;
 
-           var t = sqrt(t2),
-               q = cartesianScale(u, (-w - t) / uu);
-           cartesianAddInPlace(q, A);
-           q = spherical(q);
+                 _iterator.f();
 
-           if (!two) return q;
+                 return _context.finish(16);
 
-           // Two intersection points.
-           var lambda0 = a[0],
-               lambda1 = b[0],
-               phi0 = a[1],
-               phi1 = b[1],
-               z;
+               case 19:
+                 _context.next = 40;
+                 break;
 
-           if (lambda1 < lambda0) z = lambda0, lambda0 = lambda1, lambda1 = z;
+               case 21:
+                 index = -1;
+                 _iterator2 = _createForOfIteratorHelper(values);
+                 _context.prev = 23;
 
-           var delta = lambda1 - lambda0,
-               polar = abs$2(delta - pi) < epsilon,
-               meridian = polar || delta < epsilon;
+                 _iterator2.s();
 
-           if (!polar && phi1 < phi0) z = phi0, phi0 = phi1, phi1 = z;
+               case 25:
+                 if ((_step2 = _iterator2.n()).done) {
+                   _context.next = 32;
+                   break;
+                 }
 
-           // Check that the first point is between a and b.
-           if (meridian
-               ? polar
-                 ? phi0 + phi1 > 0 ^ q[1] < (abs$2(q[0] - lambda0) < epsilon ? phi0 : phi1)
-                 : phi0 <= q[1] && q[1] <= phi1
-               : delta > pi ^ (lambda0 <= q[0] && q[0] <= lambda1)) {
-             var q1 = cartesianScale(u, (-w + t) / uu);
-             cartesianAddInPlace(q1, A);
-             return [q, spherical(q1)];
-           }
-         }
+                 _value = _step2.value;
 
-         // Generates a 4-bit vector representing the location of a point relative to
-         // the small circle's bounding box.
-         function code(lambda, phi) {
-           var r = smallRadius ? radius : pi - radius,
-               code = 0;
-           if (lambda < -r) code |= 1; // left
-           else if (lambda > r) code |= 2; // right
-           if (phi < -r) code |= 4; // below
-           else if (phi > r) code |= 8; // above
-           return code;
-         }
+                 if (!((_value = valueof(_value, ++index, values)) != null && (_value = +_value) >= _value)) {
+                   _context.next = 30;
+                   break;
+                 }
 
-         return clip(visible, clipLine, interpolate, smallRadius ? [0, -radius] : [-pi, radius - pi]);
-       }
+                 _context.next = 30;
+                 return _value;
 
-       function clipLine(a, b, x0, y0, x1, y1) {
-         var ax = a[0],
-             ay = a[1],
-             bx = b[0],
-             by = b[1],
-             t0 = 0,
-             t1 = 1,
-             dx = bx - ax,
-             dy = by - ay,
-             r;
+               case 30:
+                 _context.next = 25;
+                 break;
 
-         r = x0 - ax;
-         if (!dx && r > 0) return;
-         r /= dx;
-         if (dx < 0) {
-           if (r < t0) return;
-           if (r < t1) t1 = r;
-         } else if (dx > 0) {
-           if (r > t1) return;
-           if (r > t0) t0 = r;
-         }
+               case 32:
+                 _context.next = 37;
+                 break;
 
-         r = x1 - ax;
-         if (!dx && r < 0) return;
-         r /= dx;
-         if (dx < 0) {
-           if (r > t1) return;
-           if (r > t0) t0 = r;
-         } else if (dx > 0) {
-           if (r < t0) return;
-           if (r < t1) t1 = r;
-         }
+               case 34:
+                 _context.prev = 34;
+                 _context.t1 = _context["catch"](23);
 
-         r = y0 - ay;
-         if (!dy && r > 0) return;
-         r /= dy;
-         if (dy < 0) {
-           if (r < t0) return;
-           if (r < t1) t1 = r;
-         } else if (dy > 0) {
-           if (r > t1) return;
-           if (r > t0) t0 = r;
-         }
+                 _iterator2.e(_context.t1);
 
-         r = y1 - ay;
-         if (!dy && r < 0) return;
-         r /= dy;
-         if (dy < 0) {
-           if (r > t1) return;
-           if (r > t0) t0 = r;
-         } else if (dy > 0) {
-           if (r < t0) return;
-           if (r < t1) t1 = r;
-         }
+               case 37:
+                 _context.prev = 37;
 
-         if (t0 > 0) a[0] = ax + t0 * dx, a[1] = ay + t0 * dy;
-         if (t1 < 1) b[0] = ax + t1 * dx, b[1] = ay + t1 * dy;
-         return true;
+                 _iterator2.f();
+
+                 return _context.finish(37);
+
+               case 40:
+               case "end":
+                 return _context.stop();
+             }
+           }
+         }, _marked, null, [[2, 13, 16, 19], [23, 34, 37, 40]]);
        }
 
-       var clipMax = 1e9, clipMin = -clipMax;
+       var ascendingBisect = d3_bisector(d3_ascending);
+       var bisectRight = ascendingBisect.right;
+       var bisectCenter = d3_bisector(number).center;
 
-       // TODO Use d3-polygon’s polygonContains here for the ring check?
-       // TODO Eliminate duplicate buffering in clipBuffer and polygon.push?
+       // `Array.prototype.fill` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.fill
+       _export({ target: 'Array', proto: true }, {
+         fill: arrayFill
+       });
 
-       function clipRectangle(x0, y0, x1, y1) {
+       // https://tc39.github.io/ecma262/#sec-array.prototype-@@unscopables
+       addToUnscopables('fill');
 
-         function visible(x, y) {
-           return x0 <= x && x <= x1 && y0 <= y && y <= y1;
-         }
+       var INCORRECT_ITERATION$1 = !checkCorrectnessOfIteration(function (iterable) {
+         Array.from(iterable);
+       });
 
-         function interpolate(from, to, direction, stream) {
-           var a = 0, a1 = 0;
-           if (from == null
-               || (a = corner(from, direction)) !== (a1 = corner(to, direction))
-               || comparePoint(from, to) < 0 ^ direction > 0) {
-             do stream.point(a === 0 || a === 3 ? x0 : x1, a > 1 ? y1 : y0);
-             while ((a = (a + direction + 4) % 4) !== a1);
-           } else {
-             stream.point(to[0], to[1]);
-           }
-         }
+       // `Array.from` method
+       // https://tc39.github.io/ecma262/#sec-array.from
+       _export({ target: 'Array', stat: true, forced: INCORRECT_ITERATION$1 }, {
+         from: arrayFrom
+       });
 
-         function corner(p, direction) {
-           return abs$2(p[0] - x0) < epsilon ? direction > 0 ? 0 : 3
-               : abs$2(p[0] - x1) < epsilon ? direction > 0 ? 2 : 1
-               : abs$2(p[1] - y0) < epsilon ? direction > 0 ? 1 : 0
-               : direction > 0 ? 3 : 2; // abs(p[1] - y1) < epsilon
-         }
+       var $some$1 = arrayIteration.some;
 
-         function compareIntersection(a, b) {
-           return comparePoint(a.x, b.x);
-         }
 
-         function comparePoint(a, b) {
-           var ca = corner(a, 1),
-               cb = corner(b, 1);
-           return ca !== cb ? ca - cb
-               : ca === 0 ? b[1] - a[1]
-               : ca === 1 ? a[0] - b[0]
-               : ca === 2 ? a[1] - b[1]
-               : b[0] - a[0];
+
+       var STRICT_METHOD$4 = arrayMethodIsStrict('some');
+       var USES_TO_LENGTH$7 = arrayMethodUsesToLength('some');
+
+       // `Array.prototype.some` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.some
+       _export({ target: 'Array', proto: true, forced: !STRICT_METHOD$4 || !USES_TO_LENGTH$7 }, {
+         some: function some(callbackfn /* , thisArg */) {
+           return $some$1(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
          }
+       });
 
-         return function(stream) {
-           var activeStream = stream,
-               bufferStream = clipBuffer(),
-               segments,
-               polygon,
-               ring,
-               x__, y__, v__, // first point
-               x_, y_, v_, // previous point
-               first,
-               clean;
+       // `Float64Array` constructor
+       // https://tc39.github.io/ecma262/#sec-typedarray-objects
+       typedArrayConstructor('Float64', function (init) {
+         return function Float64Array(data, byteOffset, length) {
+           return init(this, data, byteOffset, length);
+         };
+       });
 
-           var clipStream = {
-             point: point,
-             lineStart: lineStart,
-             lineEnd: lineEnd,
-             polygonStart: polygonStart,
-             polygonEnd: polygonEnd
-           };
+       var exportTypedArrayStaticMethod$1 = arrayBufferViewCore.exportTypedArrayStaticMethod;
 
-           function point(x, y) {
-             if (visible(x, y)) activeStream.point(x, y);
-           }
 
-           function polygonInside() {
-             var winding = 0;
+       // `%TypedArray%.from` method
+       // https://tc39.github.io/ecma262/#sec-%typedarray%.from
+       exportTypedArrayStaticMethod$1('from', typedArrayFrom, typedArrayConstructorsRequireWrappers);
 
-             for (var i = 0, n = polygon.length; i < n; ++i) {
-               for (var ring = polygon[i], j = 1, m = ring.length, point = ring[0], a0, a1, b0 = point[0], b1 = point[1]; j < m; ++j) {
-                 a0 = b0, a1 = b1, point = ring[j], b0 = point[0], b1 = point[1];
-                 if (a1 <= y1) { if (b1 > y1 && (b0 - a0) * (y1 - a1) > (b1 - a1) * (x0 - a0)) ++winding; }
-                 else { if (b1 <= y1 && (b0 - a0) * (y1 - a1) < (b1 - a1) * (x0 - a0)) --winding; }
-               }
-             }
+       function d3_descending (a, b) {
+         return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
+       }
 
-             return winding;
-           }
+       // https://github.com/python/cpython/blob/a74eea238f5baba15797e2e8b570d153bc8690a7/Modules/mathmodule.c#L1423
+       var Adder = /*#__PURE__*/function () {
+         function Adder() {
+           _classCallCheck(this, Adder);
 
-           // Buffer geometry within a polygon and then clip it en masse.
-           function polygonStart() {
-             activeStream = bufferStream, segments = [], polygon = [], clean = true;
-           }
+           this._partials = new Float64Array(32);
+           this._n = 0;
+         }
 
-           function polygonEnd() {
-             var startInside = polygonInside(),
-                 cleanInside = clean && startInside,
-                 visible = (segments = merge(segments)).length;
-             if (cleanInside || visible) {
-               stream.polygonStart();
-               if (cleanInside) {
-                 stream.lineStart();
-                 interpolate(null, null, 1, stream);
-                 stream.lineEnd();
-               }
-               if (visible) {
-                 clipRejoin(segments, compareIntersection, startInside, interpolate, stream);
-               }
-               stream.polygonEnd();
+         _createClass(Adder, [{
+           key: "add",
+           value: function add(x) {
+             var p = this._partials;
+             var i = 0;
+
+             for (var j = 0; j < this._n && j < 32; j++) {
+               var y = p[j],
+                   hi = x + y,
+                   lo = Math.abs(x) < Math.abs(y) ? x - (hi - y) : y - (hi - x);
+               if (lo) p[i++] = lo;
+               x = hi;
              }
-             activeStream = stream, segments = polygon = ring = null;
-           }
 
-           function lineStart() {
-             clipStream.point = linePoint;
-             if (polygon) polygon.push(ring = []);
-             first = true;
-             v_ = false;
-             x_ = y_ = NaN;
+             p[i] = x;
+             this._n = i + 1;
+             return this;
            }
+         }, {
+           key: "valueOf",
+           value: function valueOf() {
+             var p = this._partials;
+             var n = this._n,
+                 x,
+                 y,
+                 lo,
+                 hi = 0;
 
-           // TODO rather than special-case polygons, simply handle them separately.
-           // Ideally, coincident intersection points should be jittered to avoid
-           // clipping issues.
-           function lineEnd() {
-             if (segments) {
-               linePoint(x__, y__);
-               if (v__ && v_) bufferStream.rejoin();
-               segments.push(bufferStream.result());
-             }
-             clipStream.point = point;
-             if (v_) activeStream.lineEnd();
-           }
+             if (n > 0) {
+               hi = p[--n];
 
-           function linePoint(x, y) {
-             var v = visible(x, y);
-             if (polygon) ring.push([x, y]);
-             if (first) {
-               x__ = x, y__ = y, v__ = v;
-               first = false;
-               if (v) {
-                 activeStream.lineStart();
-                 activeStream.point(x, y);
+               while (n > 0) {
+                 x = hi;
+                 y = p[--n];
+                 hi = x + y;
+                 lo = y - (hi - x);
+                 if (lo) break;
                }
-             } else {
-               if (v && v_) activeStream.point(x, y);
-               else {
-                 var a = [x_ = Math.max(clipMin, Math.min(clipMax, x_)), y_ = Math.max(clipMin, Math.min(clipMax, y_))],
-                     b = [x = Math.max(clipMin, Math.min(clipMax, x)), y = Math.max(clipMin, Math.min(clipMax, y))];
-                 if (clipLine(a, b, x0, y0, x1, y1)) {
-                   if (!v_) {
-                     activeStream.lineStart();
-                     activeStream.point(a[0], a[1]);
-                   }
-                   activeStream.point(b[0], b[1]);
-                   if (!v) activeStream.lineEnd();
-                   clean = false;
-                 } else if (v) {
-                   activeStream.lineStart();
-                   activeStream.point(x, y);
-                   clean = false;
-                 }
+
+               if (n > 0 && (lo < 0 && p[n - 1] < 0 || lo > 0 && p[n - 1] > 0)) {
+                 y = lo * 2;
+                 x = hi + y;
+                 if (y == x - hi) hi = x;
                }
              }
-             x_ = x, y_ = y, v_ = v;
+
+             return hi;
            }
+         }]);
 
-           return clipStream;
-         };
-       }
+         return Adder;
+       }();
 
-       var lengthSum = adder(),
-           lambda0$2,
-           sinPhi0$1,
-           cosPhi0$1;
+       // `Map` constructor
+       // https://tc39.github.io/ecma262/#sec-map-objects
+       var es_map = collection('Map', function (init) {
+         return function Map() { return init(this, arguments.length ? arguments[0] : undefined); };
+       }, collectionStrong);
 
-       var lengthStream = {
-         sphere: noop$2,
-         point: noop$2,
-         lineStart: lengthLineStart,
-         lineEnd: noop$2,
-         polygonStart: noop$2,
-         polygonEnd: noop$2
-       };
+       var e10 = Math.sqrt(50),
+           e5 = Math.sqrt(10),
+           e2 = Math.sqrt(2);
+       function ticks (start, stop, count) {
+         var reverse,
+             i = -1,
+             n,
+             ticks,
+             step;
+         stop = +stop, start = +start, count = +count;
+         if (start === stop && count > 0) return [start];
+         if (reverse = stop < start) n = start, start = stop, stop = n;
+         if ((step = tickIncrement(start, stop, count)) === 0 || !isFinite(step)) return [];
 
-       function lengthLineStart() {
-         lengthStream.point = lengthPointFirst;
-         lengthStream.lineEnd = lengthLineEnd;
-       }
+         if (step > 0) {
+           start = Math.ceil(start / step);
+           stop = Math.floor(stop / step);
+           ticks = new Array(n = Math.ceil(stop - start + 1));
 
-       function lengthLineEnd() {
-         lengthStream.point = lengthStream.lineEnd = noop$2;
-       }
+           while (++i < n) {
+             ticks[i] = (start + i) * step;
+           }
+         } else {
+           step = -step;
+           start = Math.ceil(start * step);
+           stop = Math.floor(stop * step);
+           ticks = new Array(n = Math.ceil(stop - start + 1));
 
-       function lengthPointFirst(lambda, phi) {
-         lambda *= radians, phi *= radians;
-         lambda0$2 = lambda, sinPhi0$1 = sin(phi), cosPhi0$1 = cos(phi);
-         lengthStream.point = lengthPoint;
-       }
+           while (++i < n) {
+             ticks[i] = (start + i) / step;
+           }
+         }
 
-       function lengthPoint(lambda, phi) {
-         lambda *= radians, phi *= radians;
-         var sinPhi = sin(phi),
-             cosPhi = cos(phi),
-             delta = abs$2(lambda - lambda0$2),
-             cosDelta = cos(delta),
-             sinDelta = sin(delta),
-             x = cosPhi * sinDelta,
-             y = cosPhi0$1 * sinPhi - sinPhi0$1 * cosPhi * cosDelta,
-             z = sinPhi0$1 * sinPhi + cosPhi0$1 * cosPhi * cosDelta;
-         lengthSum.add(atan2(sqrt(x * x + y * y), z));
-         lambda0$2 = lambda, sinPhi0$1 = sinPhi, cosPhi0$1 = cosPhi;
+         if (reverse) ticks.reverse();
+         return ticks;
        }
-
-       function d3_geoLength(object) {
-         lengthSum.reset();
-         d3_geoStream(object, lengthStream);
-         return +lengthSum;
+       function tickIncrement(start, stop, count) {
+         var step = (stop - start) / Math.max(0, count),
+             power = Math.floor(Math.log(step) / Math.LN10),
+             error = step / Math.pow(10, power);
+         return power >= 0 ? (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1) * Math.pow(10, power) : -Math.pow(10, -power) / (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1);
        }
-
-       function identity(x) {
-         return x;
+       function tickStep(start, stop, count) {
+         var step0 = Math.abs(stop - start) / Math.max(0, count),
+             step1 = Math.pow(10, Math.floor(Math.log(step0) / Math.LN10)),
+             error = step0 / step1;
+         if (error >= e10) step1 *= 10;else if (error >= e5) step1 *= 5;else if (error >= e2) step1 *= 2;
+         return stop < start ? -step1 : step1;
        }
 
-       var areaSum$1 = adder(),
-           areaRingSum$1 = adder(),
-           x00,
-           y00,
-           x0$1,
-           y0$1;
+       function max$4(values, valueof) {
+         var max;
 
-       var areaStream$1 = {
-         point: noop$2,
-         lineStart: noop$2,
-         lineEnd: noop$2,
-         polygonStart: function() {
-           areaStream$1.lineStart = areaRingStart$1;
-           areaStream$1.lineEnd = areaRingEnd$1;
-         },
-         polygonEnd: function() {
-           areaStream$1.lineStart = areaStream$1.lineEnd = areaStream$1.point = noop$2;
-           areaSum$1.add(abs$2(areaRingSum$1));
-           areaRingSum$1.reset();
-         },
-         result: function() {
-           var area = areaSum$1 / 2;
-           areaSum$1.reset();
-           return area;
+         if (valueof === undefined) {
+           var _iterator = _createForOfIteratorHelper(values),
+               _step;
+
+           try {
+             for (_iterator.s(); !(_step = _iterator.n()).done;) {
+               var value = _step.value;
+
+               if (value != null && (max < value || max === undefined && value >= value)) {
+                 max = value;
+               }
+             }
+           } catch (err) {
+             _iterator.e(err);
+           } finally {
+             _iterator.f();
+           }
+         } else {
+           var index = -1;
+
+           var _iterator2 = _createForOfIteratorHelper(values),
+               _step2;
+
+           try {
+             for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
+               var _value = _step2.value;
+
+               if ((_value = valueof(_value, ++index, values)) != null && (max < _value || max === undefined && _value >= _value)) {
+                 max = _value;
+               }
+             }
+           } catch (err) {
+             _iterator2.e(err);
+           } finally {
+             _iterator2.f();
+           }
          }
-       };
 
-       function areaRingStart$1() {
-         areaStream$1.point = areaPointFirst$1;
+         return max;
        }
 
-       function areaPointFirst$1(x, y) {
-         areaStream$1.point = areaPoint$1;
-         x00 = x0$1 = x, y00 = y0$1 = y;
-       }
+       function min$7(values, valueof) {
+         var min;
 
-       function areaPoint$1(x, y) {
-         areaRingSum$1.add(y0$1 * x - x0$1 * y);
-         x0$1 = x, y0$1 = y;
-       }
+         if (valueof === undefined) {
+           var _iterator = _createForOfIteratorHelper(values),
+               _step;
 
-       function areaRingEnd$1() {
-         areaPoint$1(x00, y00);
-       }
+           try {
+             for (_iterator.s(); !(_step = _iterator.n()).done;) {
+               var value = _step.value;
 
-       var x0$2 = Infinity,
-           y0$2 = x0$2,
-           x1 = -x0$2,
-           y1 = x1;
+               if (value != null && (min > value || min === undefined && value >= value)) {
+                 min = value;
+               }
+             }
+           } catch (err) {
+             _iterator.e(err);
+           } finally {
+             _iterator.f();
+           }
+         } else {
+           var index = -1;
 
-       var boundsStream$1 = {
-         point: boundsPoint$1,
-         lineStart: noop$2,
-         lineEnd: noop$2,
-         polygonStart: noop$2,
-         polygonEnd: noop$2,
-         result: function() {
-           var bounds = [[x0$2, y0$2], [x1, y1]];
-           x1 = y1 = -(y0$2 = x0$2 = Infinity);
-           return bounds;
+           var _iterator2 = _createForOfIteratorHelper(values),
+               _step2;
+
+           try {
+             for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
+               var _value = _step2.value;
+
+               if ((_value = valueof(_value, ++index, values)) != null && (min > _value || min === undefined && _value >= _value)) {
+                 min = _value;
+               }
+             }
+           } catch (err) {
+             _iterator2.e(err);
+           } finally {
+             _iterator2.f();
+           }
          }
-       };
 
-       function boundsPoint$1(x, y) {
-         if (x < x0$2) x0$2 = x;
-         if (x > x1) x1 = x;
-         if (y < y0$2) y0$2 = y;
-         if (y > y1) y1 = y;
+         return min;
        }
 
-       // TODO Enforce positive area for exterior, negative area for interior?
+       // ISC license, Copyright 2018 Vladimir Agafonkin.
 
-       var X0$1 = 0,
-           Y0$1 = 0,
-           Z0$1 = 0,
-           X1$1 = 0,
-           Y1$1 = 0,
-           Z1$1 = 0,
-           X2$1 = 0,
-           Y2$1 = 0,
-           Z2$1 = 0,
-           x00$1,
-           y00$1,
-           x0$3,
-           y0$3;
+       function quickselect(array, k) {
+         var left = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : 0;
+         var right = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : array.length - 1;
+         var compare = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : d3_ascending;
 
-       var centroidStream$1 = {
-         point: centroidPoint$1,
-         lineStart: centroidLineStart$1,
-         lineEnd: centroidLineEnd$1,
-         polygonStart: function() {
-           centroidStream$1.lineStart = centroidRingStart$1;
-           centroidStream$1.lineEnd = centroidRingEnd$1;
-         },
-         polygonEnd: function() {
-           centroidStream$1.point = centroidPoint$1;
-           centroidStream$1.lineStart = centroidLineStart$1;
-           centroidStream$1.lineEnd = centroidLineEnd$1;
-         },
-         result: function() {
-           var centroid = Z2$1 ? [X2$1 / Z2$1, Y2$1 / Z2$1]
-               : Z1$1 ? [X1$1 / Z1$1, Y1$1 / Z1$1]
-               : Z0$1 ? [X0$1 / Z0$1, Y0$1 / Z0$1]
-               : [NaN, NaN];
-           X0$1 = Y0$1 = Z0$1 =
-           X1$1 = Y1$1 = Z1$1 =
-           X2$1 = Y2$1 = Z2$1 = 0;
-           return centroid;
+         while (right > left) {
+           if (right - left > 600) {
+             var n = right - left + 1;
+             var m = k - left + 1;
+             var z = Math.log(n);
+             var s = 0.5 * Math.exp(2 * z / 3);
+             var sd = 0.5 * Math.sqrt(z * s * (n - s) / n) * (m - n / 2 < 0 ? -1 : 1);
+             var newLeft = Math.max(left, Math.floor(k - m * s / n + sd));
+             var newRight = Math.min(right, Math.floor(k + (n - m) * s / n + sd));
+             quickselect(array, k, newLeft, newRight, compare);
+           }
+
+           var t = array[k];
+           var i = left;
+           var j = right;
+           swap(array, left, k);
+           if (compare(array[right], t) > 0) swap(array, left, right);
+
+           while (i < j) {
+             swap(array, i, j), ++i, --j;
+
+             while (compare(array[i], t) < 0) {
+               ++i;
+             }
+
+             while (compare(array[j], t) > 0) {
+               --j;
+             }
+           }
+
+           if (compare(array[left], t) === 0) swap(array, left, j);else ++j, swap(array, j, right);
+           if (j <= k) left = j + 1;
+           if (k <= j) right = j - 1;
          }
-       };
 
-       function centroidPoint$1(x, y) {
-         X0$1 += x;
-         Y0$1 += y;
-         ++Z0$1;
+         return array;
        }
 
-       function centroidLineStart$1() {
-         centroidStream$1.point = centroidPointFirstLine;
+       function swap(array, i, j) {
+         var t = array[i];
+         array[i] = array[j];
+         array[j] = t;
        }
 
-       function centroidPointFirstLine(x, y) {
-         centroidStream$1.point = centroidPointLine;
-         centroidPoint$1(x0$3 = x, y0$3 = y);
+       function quantile(values, p, valueof) {
+         values = Float64Array.from(numbers(values, valueof));
+         if (!(n = values.length)) return;
+         if ((p = +p) <= 0 || n < 2) return min$7(values);
+         if (p >= 1) return max$4(values);
+         var n,
+             i = (n - 1) * p,
+             i0 = Math.floor(i),
+             value0 = max$4(quickselect(values, i0).subarray(0, i0 + 1)),
+             value1 = min$7(values.subarray(i0 + 1));
+         return value0 + (value1 - value0) * (i - i0);
        }
 
-       function centroidPointLine(x, y) {
-         var dx = x - x0$3, dy = y - y0$3, z = sqrt(dx * dx + dy * dy);
-         X1$1 += z * (x0$3 + x) / 2;
-         Y1$1 += z * (y0$3 + y) / 2;
-         Z1$1 += z;
-         centroidPoint$1(x0$3 = x, y0$3 = y);
+       function d3_median (values, valueof) {
+         return quantile(values, 0.5, valueof);
        }
 
-       function centroidLineEnd$1() {
-         centroidStream$1.point = centroidPoint$1;
-       }
+       var _marked$1 = /*#__PURE__*/regeneratorRuntime.mark(flatten);
 
-       function centroidRingStart$1() {
-         centroidStream$1.point = centroidPointFirstRing;
-       }
+       function flatten(arrays) {
+         var _iterator, _step, array;
 
-       function centroidRingEnd$1() {
-         centroidPointRing(x00$1, y00$1);
+         return regeneratorRuntime.wrap(function flatten$(_context) {
+           while (1) {
+             switch (_context.prev = _context.next) {
+               case 0:
+                 _iterator = _createForOfIteratorHelper(arrays);
+                 _context.prev = 1;
+
+                 _iterator.s();
+
+               case 3:
+                 if ((_step = _iterator.n()).done) {
+                   _context.next = 8;
+                   break;
+                 }
+
+                 array = _step.value;
+                 return _context.delegateYield(array, "t0", 6);
+
+               case 6:
+                 _context.next = 3;
+                 break;
+
+               case 8:
+                 _context.next = 13;
+                 break;
+
+               case 10:
+                 _context.prev = 10;
+                 _context.t1 = _context["catch"](1);
+
+                 _iterator.e(_context.t1);
+
+               case 13:
+                 _context.prev = 13;
+
+                 _iterator.f();
+
+                 return _context.finish(13);
+
+               case 16:
+               case "end":
+                 return _context.stop();
+             }
+           }
+         }, _marked$1, null, [[1, 10, 13, 16]]);
        }
 
-       function centroidPointFirstRing(x, y) {
-         centroidStream$1.point = centroidPointRing;
-         centroidPoint$1(x00$1 = x0$3 = x, y00$1 = y0$3 = y);
+       function merge(arrays) {
+         return Array.from(flatten(arrays));
        }
 
-       function centroidPointRing(x, y) {
-         var dx = x - x0$3,
-             dy = y - y0$3,
-             z = sqrt(dx * dx + dy * dy);
+       function range (start, stop, step) {
+         start = +start, stop = +stop, step = (n = arguments.length) < 2 ? (stop = start, start = 0, 1) : n < 3 ? 1 : +step;
+         var i = -1,
+             n = Math.max(0, Math.ceil((stop - start) / step)) | 0,
+             range = new Array(n);
 
-         X1$1 += z * (x0$3 + x) / 2;
-         Y1$1 += z * (y0$3 + y) / 2;
-         Z1$1 += z;
+         while (++i < n) {
+           range[i] = start + i * step;
+         }
 
-         z = y0$3 * x - x0$3 * y;
-         X2$1 += z * (x0$3 + x);
-         Y2$1 += z * (y0$3 + y);
-         Z2$1 += z * 3;
-         centroidPoint$1(x0$3 = x, y0$3 = y);
+         return range;
        }
 
-       function PathContext(context) {
-         this._context = context;
-       }
+       var test$2 = [];
+       var nativeSort = test$2.sort;
 
-       PathContext.prototype = {
-         _radius: 4.5,
-         pointRadius: function(_) {
-           return this._radius = _, this;
-         },
-         polygonStart: function() {
-           this._line = 0;
-         },
-         polygonEnd: function() {
-           this._line = NaN;
-         },
-         lineStart: function() {
-           this._point = 0;
-         },
-         lineEnd: function() {
-           if (this._line === 0) this._context.closePath();
-           this._point = NaN;
-         },
-         point: function(x, y) {
-           switch (this._point) {
-             case 0: {
-               this._context.moveTo(x, y);
-               this._point = 1;
-               break;
-             }
-             case 1: {
-               this._context.lineTo(x, y);
-               break;
-             }
-             default: {
-               this._context.moveTo(x + this._radius, y);
-               this._context.arc(x, y, this._radius, 0, tau);
-               break;
-             }
-           }
-         },
-         result: noop$2
+       // IE8-
+       var FAILS_ON_UNDEFINED = fails(function () {
+         test$2.sort(undefined);
+       });
+       // V8 bug
+       var FAILS_ON_NULL = fails(function () {
+         test$2.sort(null);
+       });
+       // Old WebKit
+       var STRICT_METHOD$5 = arrayMethodIsStrict('sort');
+
+       var FORCED$a = FAILS_ON_UNDEFINED || !FAILS_ON_NULL || !STRICT_METHOD$5;
+
+       // `Array.prototype.sort` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.sort
+       _export({ target: 'Array', proto: true, forced: FORCED$a }, {
+         sort: function sort(comparefn) {
+           return comparefn === undefined
+             ? nativeSort.call(toObject(this))
+             : nativeSort.call(toObject(this), aFunction$1(comparefn));
+         }
+       });
+
+       // `SameValue` abstract operation
+       // https://tc39.github.io/ecma262/#sec-samevalue
+       var sameValue = Object.is || function is(x, y) {
+         // eslint-disable-next-line no-self-compare
+         return x === y ? x !== 0 || 1 / x === 1 / y : x != x && y != y;
        };
 
-       var lengthSum$1 = adder(),
-           lengthRing,
-           x00$2,
-           y00$2,
-           x0$4,
-           y0$4;
+       var $hypot = Math.hypot;
+       var abs$1 = Math.abs;
+       var sqrt = Math.sqrt;
 
-       var lengthStream$1 = {
-         point: noop$2,
-         lineStart: function() {
-           lengthStream$1.point = lengthPointFirst$1;
-         },
-         lineEnd: function() {
-           if (lengthRing) lengthPoint$1(x00$2, y00$2);
-           lengthStream$1.point = noop$2;
-         },
-         polygonStart: function() {
-           lengthRing = true;
-         },
-         polygonEnd: function() {
-           lengthRing = null;
-         },
-         result: function() {
-           var length = +lengthSum$1;
-           lengthSum$1.reset();
-           return length;
+       // Chrome 77 bug
+       // https://bugs.chromium.org/p/v8/issues/detail?id=9546
+       var BUGGY = !!$hypot && $hypot(Infinity, NaN) !== Infinity;
+
+       // `Math.hypot` method
+       // https://tc39.github.io/ecma262/#sec-math.hypot
+       _export({ target: 'Math', stat: true, forced: BUGGY }, {
+         hypot: function hypot(value1, value2) { // eslint-disable-line no-unused-vars
+           var sum = 0;
+           var i = 0;
+           var aLen = arguments.length;
+           var larg = 0;
+           var arg, div;
+           while (i < aLen) {
+             arg = abs$1(arguments[i++]);
+             if (larg < arg) {
+               div = larg / arg;
+               sum = sum * div * div + 1;
+               larg = arg;
+             } else if (arg > 0) {
+               div = arg / larg;
+               sum += div * div;
+             } else sum += arg;
+           }
+           return larg === Infinity ? Infinity : larg * sqrt(sum);
          }
+       });
+
+       // `Math.sign` method implementation
+       // https://tc39.github.io/ecma262/#sec-math.sign
+       var mathSign = Math.sign || function sign(x) {
+         // eslint-disable-next-line no-self-compare
+         return (x = +x) == 0 || x != x ? x : x < 0 ? -1 : 1;
        };
 
-       function lengthPointFirst$1(x, y) {
-         lengthStream$1.point = lengthPoint$1;
-         x00$2 = x0$4 = x, y00$2 = y0$4 = y;
-       }
+       // `Math.sign` method
+       // https://tc39.github.io/ecma262/#sec-math.sign
+       _export({ target: 'Math', stat: true }, {
+         sign: mathSign
+       });
 
-       function lengthPoint$1(x, y) {
-         x0$4 -= x, y0$4 -= y;
-         lengthSum$1.add(sqrt(x0$4 * x0$4 + y0$4 * y0$4));
-         x0$4 = x, y0$4 = y;
+       var epsilon = 1e-6;
+       var epsilon2 = 1e-12;
+       var pi = Math.PI;
+       var halfPi = pi / 2;
+       var quarterPi = pi / 4;
+       var tau = pi * 2;
+       var degrees = 180 / pi;
+       var radians = pi / 180;
+       var abs$2 = Math.abs;
+       var atan = Math.atan;
+       var atan2 = Math.atan2;
+       var cos = Math.cos;
+       var exp = Math.exp;
+       var hypot = Math.hypot;
+       var log$1 = Math.log;
+       var sin = Math.sin;
+       var sign = Math.sign || function (x) {
+         return x > 0 ? 1 : x < 0 ? -1 : 0;
+       };
+       var sqrt$1 = Math.sqrt;
+       var tan = Math.tan;
+       function acos(x) {
+         return x > 1 ? 0 : x < -1 ? pi : Math.acos(x);
+       }
+       function asin(x) {
+         return x > 1 ? halfPi : x < -1 ? -halfPi : Math.asin(x);
        }
 
-       function PathString() {
-         this._string = [];
+       function noop() {}
+
+       function streamGeometry(geometry, stream) {
+         if (geometry && streamGeometryType.hasOwnProperty(geometry.type)) {
+           streamGeometryType[geometry.type](geometry, stream);
+         }
        }
 
-       PathString.prototype = {
-         _radius: 4.5,
-         _circle: circle(4.5),
-         pointRadius: function(_) {
-           if ((_ = +_) !== this._radius) this._radius = _, this._circle = null;
-           return this;
+       var streamObjectType = {
+         Feature: function Feature(object, stream) {
+           streamGeometry(object.geometry, stream);
          },
-         polygonStart: function() {
-           this._line = 0;
+         FeatureCollection: function FeatureCollection(object, stream) {
+           var features = object.features,
+               i = -1,
+               n = features.length;
+
+           while (++i < n) {
+             streamGeometry(features[i].geometry, stream);
+           }
+         }
+       };
+       var streamGeometryType = {
+         Sphere: function Sphere(object, stream) {
+           stream.sphere();
          },
-         polygonEnd: function() {
-           this._line = NaN;
+         Point: function Point(object, stream) {
+           object = object.coordinates;
+           stream.point(object[0], object[1], object[2]);
          },
-         lineStart: function() {
-           this._point = 0;
+         MultiPoint: function MultiPoint(object, stream) {
+           var coordinates = object.coordinates,
+               i = -1,
+               n = coordinates.length;
+
+           while (++i < n) {
+             object = coordinates[i], stream.point(object[0], object[1], object[2]);
+           }
          },
-         lineEnd: function() {
-           if (this._line === 0) this._string.push("Z");
-           this._point = NaN;
+         LineString: function LineString(object, stream) {
+           streamLine(object.coordinates, stream, 0);
          },
-         point: function(x, y) {
-           switch (this._point) {
-             case 0: {
-               this._string.push("M", x, ",", y);
-               this._point = 1;
-               break;
-             }
-             case 1: {
-               this._string.push("L", x, ",", y);
-               break;
-             }
-             default: {
-               if (this._circle == null) this._circle = circle(this._radius);
-               this._string.push("M", x, ",", y, this._circle);
-               break;
-             }
+         MultiLineString: function MultiLineString(object, stream) {
+           var coordinates = object.coordinates,
+               i = -1,
+               n = coordinates.length;
+
+           while (++i < n) {
+             streamLine(coordinates[i], stream, 0);
            }
          },
-         result: function() {
-           if (this._string.length) {
-             var result = this._string.join("");
-             this._string = [];
-             return result;
-           } else {
-             return null;
+         Polygon: function Polygon(object, stream) {
+           streamPolygon(object.coordinates, stream);
+         },
+         MultiPolygon: function MultiPolygon(object, stream) {
+           var coordinates = object.coordinates,
+               i = -1,
+               n = coordinates.length;
+
+           while (++i < n) {
+             streamPolygon(coordinates[i], stream);
+           }
+         },
+         GeometryCollection: function GeometryCollection(object, stream) {
+           var geometries = object.geometries,
+               i = -1,
+               n = geometries.length;
+
+           while (++i < n) {
+             streamGeometry(geometries[i], stream);
            }
          }
        };
 
-       function circle(radius) {
-         return "m0," + radius
-             + "a" + radius + "," + radius + " 0 1,1 0," + -2 * radius
-             + "a" + radius + "," + radius + " 0 1,1 0," + 2 * radius
-             + "z";
-       }
-
-       function d3_geoPath(projection, context) {
-         var pointRadius = 4.5,
-             projectionStream,
-             contextStream;
+       function streamLine(coordinates, stream, closed) {
+         var i = -1,
+             n = coordinates.length - closed,
+             coordinate;
+         stream.lineStart();
 
-         function path(object) {
-           if (object) {
-             if (typeof pointRadius === "function") contextStream.pointRadius(+pointRadius.apply(this, arguments));
-             d3_geoStream(object, projectionStream(contextStream));
-           }
-           return contextStream.result();
+         while (++i < n) {
+           coordinate = coordinates[i], stream.point(coordinate[0], coordinate[1], coordinate[2]);
          }
 
-         path.area = function(object) {
-           d3_geoStream(object, projectionStream(areaStream$1));
-           return areaStream$1.result();
-         };
+         stream.lineEnd();
+       }
 
-         path.measure = function(object) {
-           d3_geoStream(object, projectionStream(lengthStream$1));
-           return lengthStream$1.result();
-         };
+       function streamPolygon(coordinates, stream) {
+         var i = -1,
+             n = coordinates.length;
+         stream.polygonStart();
 
-         path.bounds = function(object) {
-           d3_geoStream(object, projectionStream(boundsStream$1));
-           return boundsStream$1.result();
-         };
+         while (++i < n) {
+           streamLine(coordinates[i], stream, 1);
+         }
 
-         path.centroid = function(object) {
-           d3_geoStream(object, projectionStream(centroidStream$1));
-           return centroidStream$1.result();
-         };
+         stream.polygonEnd();
+       }
 
-         path.projection = function(_) {
-           return arguments.length ? (projectionStream = _ == null ? (projection = null, identity) : (projection = _).stream, path) : projection;
-         };
+       function d3_geoStream (object, stream) {
+         if (object && streamObjectType.hasOwnProperty(object.type)) {
+           streamObjectType[object.type](object, stream);
+         } else {
+           streamGeometry(object, stream);
+         }
+       }
 
-         path.context = function(_) {
-           if (!arguments.length) return context;
-           contextStream = _ == null ? (context = null, new PathString) : new PathContext(context = _);
-           if (typeof pointRadius !== "function") contextStream.pointRadius(pointRadius);
-           return path;
-         };
+       var areaRingSum = new Adder(); // hello?
 
-         path.pointRadius = function(_) {
-           if (!arguments.length) return pointRadius;
-           pointRadius = typeof _ === "function" ? _ : (contextStream.pointRadius(+_), +_);
-           return path;
-         };
+       var areaSum = new Adder(),
+           lambda00,
+           phi00,
+           lambda0,
+           cosPhi0,
+           sinPhi0;
+       var areaStream = {
+         point: noop,
+         lineStart: noop,
+         lineEnd: noop,
+         polygonStart: function polygonStart() {
+           areaRingSum = new Adder();
+           areaStream.lineStart = areaRingStart;
+           areaStream.lineEnd = areaRingEnd;
+         },
+         polygonEnd: function polygonEnd() {
+           var areaRing = +areaRingSum;
+           areaSum.add(areaRing < 0 ? tau + areaRing : areaRing);
+           this.lineStart = this.lineEnd = this.point = noop;
+         },
+         sphere: function sphere() {
+           areaSum.add(tau);
+         }
+       };
 
-         return path.projection(projection).context(context);
+       function areaRingStart() {
+         areaStream.point = areaPointFirst;
        }
 
-       function d3_geoTransform(methods) {
-         return {
-           stream: transformer(methods)
-         };
+       function areaRingEnd() {
+         areaPoint(lambda00, phi00);
        }
 
-       function transformer(methods) {
-         return function(stream) {
-           var s = new TransformStream;
-           for (var key in methods) s[key] = methods[key];
-           s.stream = stream;
-           return s;
-         };
+       function areaPointFirst(lambda, phi) {
+         areaStream.point = areaPoint;
+         lambda00 = lambda, phi00 = phi;
+         lambda *= radians, phi *= radians;
+         lambda0 = lambda, cosPhi0 = cos(phi = phi / 2 + quarterPi), sinPhi0 = sin(phi);
        }
 
-       function TransformStream() {}
+       function areaPoint(lambda, phi) {
+         lambda *= radians, phi *= radians;
+         phi = phi / 2 + quarterPi; // half the angular distance from south pole
+         // Spherical excess E for a spherical triangle with vertices: south pole,
+         // previous point, current point.  Uses a formula derived from Cagnoli’s
+         // theorem.  See Todhunter, Spherical Trig. (1871), Sec. 103, Eq. (2).
 
-       TransformStream.prototype = {
-         constructor: TransformStream,
-         point: function(x, y) { this.stream.point(x, y); },
-         sphere: function() { this.stream.sphere(); },
-         lineStart: function() { this.stream.lineStart(); },
-         lineEnd: function() { this.stream.lineEnd(); },
-         polygonStart: function() { this.stream.polygonStart(); },
-         polygonEnd: function() { this.stream.polygonEnd(); }
-       };
+         var dLambda = lambda - lambda0,
+             sdLambda = dLambda >= 0 ? 1 : -1,
+             adLambda = sdLambda * dLambda,
+             cosPhi = cos(phi),
+             sinPhi = sin(phi),
+             k = sinPhi0 * sinPhi,
+             u = cosPhi0 * cosPhi + k * cos(adLambda),
+             v = k * sdLambda * sin(adLambda);
+         areaRingSum.add(atan2(v, u)); // Advance the previous points.
 
-       function fit(projection, fitBounds, object) {
-         var clip = projection.clipExtent && projection.clipExtent();
-         projection.scale(150).translate([0, 0]);
-         if (clip != null) projection.clipExtent(null);
-         d3_geoStream(object, projection.stream(boundsStream$1));
-         fitBounds(boundsStream$1.result());
-         if (clip != null) projection.clipExtent(clip);
-         return projection;
+         lambda0 = lambda, cosPhi0 = cosPhi, sinPhi0 = sinPhi;
        }
 
-       function fitExtent(projection, extent, object) {
-         return fit(projection, function(b) {
-           var w = extent[1][0] - extent[0][0],
-               h = extent[1][1] - extent[0][1],
-               k = Math.min(w / (b[1][0] - b[0][0]), h / (b[1][1] - b[0][1])),
-               x = +extent[0][0] + (w - k * (b[1][0] + b[0][0])) / 2,
-               y = +extent[0][1] + (h - k * (b[1][1] + b[0][1])) / 2;
-           projection.scale(150 * k).translate([x, y]);
-         }, object);
+       function d3_geoArea (object) {
+         areaSum = new Adder();
+         d3_geoStream(object, areaStream);
+         return areaSum * 2;
        }
 
-       function fitSize(projection, size, object) {
-         return fitExtent(projection, [[0, 0], size], object);
+       function spherical(cartesian) {
+         return [atan2(cartesian[1], cartesian[0]), asin(cartesian[2])];
        }
-
-       function fitWidth(projection, width, object) {
-         return fit(projection, function(b) {
-           var w = +width,
-               k = w / (b[1][0] - b[0][0]),
-               x = (w - k * (b[1][0] + b[0][0])) / 2,
-               y = -k * b[0][1];
-           projection.scale(150 * k).translate([x, y]);
-         }, object);
+       function cartesian(spherical) {
+         var lambda = spherical[0],
+             phi = spherical[1],
+             cosPhi = cos(phi);
+         return [cosPhi * cos(lambda), cosPhi * sin(lambda), sin(phi)];
        }
-
-       function fitHeight(projection, height, object) {
-         return fit(projection, function(b) {
-           var h = +height,
-               k = h / (b[1][1] - b[0][1]),
-               x = -k * b[0][0],
-               y = (h - k * (b[1][1] + b[0][1])) / 2;
-           projection.scale(150 * k).translate([x, y]);
-         }, object);
+       function cartesianDot(a, b) {
+         return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
        }
+       function cartesianCross(a, b) {
+         return [a[1] * b[2] - a[2] * b[1], a[2] * b[0] - a[0] * b[2], a[0] * b[1] - a[1] * b[0]];
+       } // TODO return a
 
-       var maxDepth = 16, // maximum depth of subdivision
-           cosMinDistance = cos(30 * radians); // cos(minimum angular distance)
-
-       function resample(project, delta2) {
-         return +delta2 ? resample$1(project, delta2) : resampleNone(project);
+       function cartesianAddInPlace(a, b) {
+         a[0] += b[0], a[1] += b[1], a[2] += b[2];
        }
+       function cartesianScale(vector, k) {
+         return [vector[0] * k, vector[1] * k, vector[2] * k];
+       } // TODO return d
 
-       function resampleNone(project) {
-         return transformer({
-           point: function(x, y) {
-             x = project(x, y);
-             this.stream.point(x[0], x[1]);
-           }
-         });
+       function cartesianNormalizeInPlace(d) {
+         var l = sqrt$1(d[0] * d[0] + d[1] * d[1] + d[2] * d[2]);
+         d[0] /= l, d[1] /= l, d[2] /= l;
        }
 
-       function resample$1(project, delta2) {
-
-         function resampleLineTo(x0, y0, lambda0, a0, b0, c0, x1, y1, lambda1, a1, b1, c1, depth, stream) {
-           var dx = x1 - x0,
-               dy = y1 - y0,
-               d2 = dx * dx + dy * dy;
-           if (d2 > 4 * delta2 && depth--) {
-             var a = a0 + a1,
-                 b = b0 + b1,
-                 c = c0 + c1,
-                 m = sqrt(a * a + b * b + c * c),
-                 phi2 = asin(c /= m),
-                 lambda2 = abs$2(abs$2(c) - 1) < epsilon || abs$2(lambda0 - lambda1) < epsilon ? (lambda0 + lambda1) / 2 : atan2(b, a),
-                 p = project(lambda2, phi2),
-                 x2 = p[0],
-                 y2 = p[1],
-                 dx2 = x2 - x0,
-                 dy2 = y2 - y0,
-                 dz = dy * dx2 - dx * dy2;
-             if (dz * dz / d2 > delta2 // perpendicular projected distance
-                 || abs$2((dx * dx2 + dy * dy2) / d2 - 0.5) > 0.3 // midpoint close to an end
-                 || a0 * a1 + b0 * b1 + c0 * c1 < cosMinDistance) { // angular distance
-               resampleLineTo(x0, y0, lambda0, a0, b0, c0, x2, y2, lambda2, a /= m, b /= m, c, depth, stream);
-               stream.point(x2, y2);
-               resampleLineTo(x2, y2, lambda2, a, b, c, x1, y1, lambda1, a1, b1, c1, depth, stream);
-             }
-           }
+       var lambda0$1, phi0, lambda1, phi1, // bounds
+       lambda2, // previous lambda-coordinate
+       lambda00$1, phi00$1, // first point
+       p0, // previous 3D point
+       deltaSum, ranges, range$1;
+       var boundsStream = {
+         point: boundsPoint,
+         lineStart: boundsLineStart,
+         lineEnd: boundsLineEnd,
+         polygonStart: function polygonStart() {
+           boundsStream.point = boundsRingPoint;
+           boundsStream.lineStart = boundsRingStart;
+           boundsStream.lineEnd = boundsRingEnd;
+           deltaSum = new Adder();
+           areaStream.polygonStart();
+         },
+         polygonEnd: function polygonEnd() {
+           areaStream.polygonEnd();
+           boundsStream.point = boundsPoint;
+           boundsStream.lineStart = boundsLineStart;
+           boundsStream.lineEnd = boundsLineEnd;
+           if (areaRingSum < 0) lambda0$1 = -(lambda1 = 180), phi0 = -(phi1 = 90);else if (deltaSum > epsilon) phi1 = 90;else if (deltaSum < -epsilon) phi0 = -90;
+           range$1[0] = lambda0$1, range$1[1] = lambda1;
+         },
+         sphere: function sphere() {
+           lambda0$1 = -(lambda1 = 180), phi0 = -(phi1 = 90);
          }
-         return function(stream) {
-           var lambda00, x00, y00, a00, b00, c00, // first point
-               lambda0, x0, y0, a0, b0, c0; // previous point
-
-           var resampleStream = {
-             point: point,
-             lineStart: lineStart,
-             lineEnd: lineEnd,
-             polygonStart: function() { stream.polygonStart(); resampleStream.lineStart = ringStart; },
-             polygonEnd: function() { stream.polygonEnd(); resampleStream.lineStart = lineStart; }
-           };
-
-           function point(x, y) {
-             x = project(x, y);
-             stream.point(x[0], x[1]);
-           }
-
-           function lineStart() {
-             x0 = NaN;
-             resampleStream.point = linePoint;
-             stream.lineStart();
-           }
+       };
 
-           function linePoint(lambda, phi) {
-             var c = cartesian([lambda, phi]), p = project(lambda, phi);
-             resampleLineTo(x0, y0, lambda0, a0, b0, c0, x0 = p[0], y0 = p[1], lambda0 = lambda, a0 = c[0], b0 = c[1], c0 = c[2], maxDepth, stream);
-             stream.point(x0, y0);
-           }
+       function boundsPoint(lambda, phi) {
+         ranges.push(range$1 = [lambda0$1 = lambda, lambda1 = lambda]);
+         if (phi < phi0) phi0 = phi;
+         if (phi > phi1) phi1 = phi;
+       }
 
-           function lineEnd() {
-             resampleStream.point = point;
-             stream.lineEnd();
-           }
+       function linePoint(lambda, phi) {
+         var p = cartesian([lambda * radians, phi * radians]);
 
-           function ringStart() {
-             lineStart();
-             resampleStream.point = ringPoint;
-             resampleStream.lineEnd = ringEnd;
-           }
+         if (p0) {
+           var normal = cartesianCross(p0, p),
+               equatorial = [normal[1], -normal[0], 0],
+               inflection = cartesianCross(equatorial, normal);
+           cartesianNormalizeInPlace(inflection);
+           inflection = spherical(inflection);
+           var delta = lambda - lambda2,
+               sign = delta > 0 ? 1 : -1,
+               lambdai = inflection[0] * degrees * sign,
+               phii,
+               antimeridian = abs$2(delta) > 180;
 
-           function ringPoint(lambda, phi) {
-             linePoint(lambda00 = lambda, phi), x00 = x0, y00 = y0, a00 = a0, b00 = b0, c00 = c0;
-             resampleStream.point = linePoint;
+           if (antimeridian ^ (sign * lambda2 < lambdai && lambdai < sign * lambda)) {
+             phii = inflection[1] * degrees;
+             if (phii > phi1) phi1 = phii;
+           } else if (lambdai = (lambdai + 360) % 360 - 180, antimeridian ^ (sign * lambda2 < lambdai && lambdai < sign * lambda)) {
+             phii = -inflection[1] * degrees;
+             if (phii < phi0) phi0 = phii;
+           } else {
+             if (phi < phi0) phi0 = phi;
+             if (phi > phi1) phi1 = phi;
            }
 
-           function ringEnd() {
-             resampleLineTo(x0, y0, lambda0, a0, b0, c0, x00, y00, lambda00, a00, b00, c00, maxDepth, stream);
-             resampleStream.lineEnd = lineEnd;
-             lineEnd();
+           if (antimeridian) {
+             if (lambda < lambda2) {
+               if (angle(lambda0$1, lambda) > angle(lambda0$1, lambda1)) lambda1 = lambda;
+             } else {
+               if (angle(lambda, lambda1) > angle(lambda0$1, lambda1)) lambda0$1 = lambda;
+             }
+           } else {
+             if (lambda1 >= lambda0$1) {
+               if (lambda < lambda0$1) lambda0$1 = lambda;
+               if (lambda > lambda1) lambda1 = lambda;
+             } else {
+               if (lambda > lambda2) {
+                 if (angle(lambda0$1, lambda) > angle(lambda0$1, lambda1)) lambda1 = lambda;
+               } else {
+                 if (angle(lambda, lambda1) > angle(lambda0$1, lambda1)) lambda0$1 = lambda;
+               }
+             }
            }
+         } else {
+           ranges.push(range$1 = [lambda0$1 = lambda, lambda1 = lambda]);
+         }
 
-           return resampleStream;
-         };
+         if (phi < phi0) phi0 = phi;
+         if (phi > phi1) phi1 = phi;
+         p0 = p, lambda2 = lambda;
        }
 
-       var transformRadians = transformer({
-         point: function(x, y) {
-           this.stream.point(x * radians, y * radians);
-         }
-       });
-
-       function transformRotate(rotate) {
-         return transformer({
-           point: function(x, y) {
-             var r = rotate(x, y);
-             return this.stream.point(r[0], r[1]);
-           }
-         });
+       function boundsLineStart() {
+         boundsStream.point = linePoint;
        }
 
-       function scaleTranslate(k, dx, dy, sx, sy) {
-         function transform(x, y) {
-           x *= sx; y *= sy;
-           return [dx + k * x, dy - k * y];
-         }
-         transform.invert = function(x, y) {
-           return [(x - dx) / k * sx, (dy - y) / k * sy];
-         };
-         return transform;
+       function boundsLineEnd() {
+         range$1[0] = lambda0$1, range$1[1] = lambda1;
+         boundsStream.point = boundsPoint;
+         p0 = null;
        }
 
-       function scaleTranslateRotate(k, dx, dy, sx, sy, alpha) {
-         var cosAlpha = cos(alpha),
-             sinAlpha = sin(alpha),
-             a = cosAlpha * k,
-             b = sinAlpha * k,
-             ai = cosAlpha / k,
-             bi = sinAlpha / k,
-             ci = (sinAlpha * dy - cosAlpha * dx) / k,
-             fi = (sinAlpha * dx + cosAlpha * dy) / k;
-         function transform(x, y) {
-           x *= sx; y *= sy;
-           return [a * x - b * y + dx, dy - b * x - a * y];
+       function boundsRingPoint(lambda, phi) {
+         if (p0) {
+           var delta = lambda - lambda2;
+           deltaSum.add(abs$2(delta) > 180 ? delta + (delta > 0 ? 360 : -360) : delta);
+         } else {
+           lambda00$1 = lambda, phi00$1 = phi;
          }
-         transform.invert = function(x, y) {
-           return [sx * (ai * x - bi * y + ci), sy * (fi - bi * x - ai * y)];
-         };
-         return transform;
-       }
 
-       function projection(project) {
-         return projectionMutator(function() { return project; })();
+         areaStream.point(lambda, phi);
+         linePoint(lambda, phi);
        }
 
-       function projectionMutator(projectAt) {
-         var project,
-             k = 150, // scale
-             x = 480, y = 250, // translate
-             lambda = 0, phi = 0, // center
-             deltaLambda = 0, deltaPhi = 0, deltaGamma = 0, rotate, // pre-rotate
-             alpha = 0, // post-rotate angle
-             sx = 1, // reflectX
-             sy = 1, // reflectX
-             theta = null, preclip = clipAntimeridian, // pre-clip angle
-             x0 = null, y0, x1, y1, postclip = identity, // post-clip extent
-             delta2 = 0.5, // precision
-             projectResample,
-             projectTransform,
-             projectRotateTransform,
-             cache,
-             cacheStream;
+       function boundsRingStart() {
+         areaStream.lineStart();
+       }
 
-         function projection(point) {
-           return projectRotateTransform(point[0] * radians, point[1] * radians);
-         }
+       function boundsRingEnd() {
+         boundsRingPoint(lambda00$1, phi00$1);
+         areaStream.lineEnd();
+         if (abs$2(deltaSum) > epsilon) lambda0$1 = -(lambda1 = 180);
+         range$1[0] = lambda0$1, range$1[1] = lambda1;
+         p0 = null;
+       } // Finds the left-right distance between two longitudes.
+       // This is almost the same as (lambda1 - lambda0 + 360°) % 360°, except that we want
+       // the distance between ±180° to be 360°.
 
-         function invert(point) {
-           point = projectRotateTransform.invert(point[0], point[1]);
-           return point && [point[0] * degrees, point[1] * degrees];
-         }
 
-         projection.stream = function(stream) {
-           return cache && cacheStream === stream ? cache : cache = transformRadians(transformRotate(rotate)(preclip(projectResample(postclip(cacheStream = stream)))));
-         };
+       function angle(lambda0, lambda1) {
+         return (lambda1 -= lambda0) < 0 ? lambda1 + 360 : lambda1;
+       }
 
-         projection.preclip = function(_) {
-           return arguments.length ? (preclip = _, theta = undefined, reset()) : preclip;
-         };
+       function rangeCompare(a, b) {
+         return a[0] - b[0];
+       }
 
-         projection.postclip = function(_) {
-           return arguments.length ? (postclip = _, x0 = y0 = x1 = y1 = null, reset()) : postclip;
-         };
+       function rangeContains(range, x) {
+         return range[0] <= range[1] ? range[0] <= x && x <= range[1] : x < range[0] || range[1] < x;
+       }
 
-         projection.clipAngle = function(_) {
-           return arguments.length ? (preclip = +_ ? clipCircle(theta = _ * radians) : (theta = null, clipAntimeridian), reset()) : theta * degrees;
-         };
+       function d3_geoBounds (feature) {
+         var i, n, a, b, merged, deltaMax, delta;
+         phi1 = lambda1 = -(lambda0$1 = phi0 = Infinity);
+         ranges = [];
+         d3_geoStream(feature, boundsStream); // First, sort ranges by their minimum longitudes.
 
-         projection.clipExtent = function(_) {
-           return arguments.length ? (postclip = _ == null ? (x0 = y0 = x1 = y1 = null, identity) : clipRectangle(x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reset()) : x0 == null ? null : [[x0, y0], [x1, y1]];
-         };
+         if (n = ranges.length) {
+           ranges.sort(rangeCompare); // Then, merge any ranges that overlap.
 
-         projection.scale = function(_) {
-           return arguments.length ? (k = +_, recenter()) : k;
-         };
+           for (i = 1, a = ranges[0], merged = [a]; i < n; ++i) {
+             b = ranges[i];
 
-         projection.translate = function(_) {
-           return arguments.length ? (x = +_[0], y = +_[1], recenter()) : [x, y];
-         };
+             if (rangeContains(a, b[0]) || rangeContains(a, b[1])) {
+               if (angle(a[0], b[1]) > angle(a[0], a[1])) a[1] = b[1];
+               if (angle(b[0], a[1]) > angle(a[0], a[1])) a[0] = b[0];
+             } else {
+               merged.push(a = b);
+             }
+           } // Finally, find the largest gap between the merged ranges.
+           // The final bounding box will be the inverse of this gap.
 
-         projection.center = function(_) {
-           return arguments.length ? (lambda = _[0] % 360 * radians, phi = _[1] % 360 * radians, recenter()) : [lambda * degrees, phi * degrees];
-         };
 
-         projection.rotate = function(_) {
-           return arguments.length ? (deltaLambda = _[0] % 360 * radians, deltaPhi = _[1] % 360 * radians, deltaGamma = _.length > 2 ? _[2] % 360 * radians : 0, recenter()) : [deltaLambda * degrees, deltaPhi * degrees, deltaGamma * degrees];
-         };
+           for (deltaMax = -Infinity, n = merged.length - 1, i = 0, a = merged[n]; i <= n; a = b, ++i) {
+             b = merged[i];
+             if ((delta = angle(a[1], b[0])) > deltaMax) deltaMax = delta, lambda0$1 = b[0], lambda1 = a[1];
+           }
+         }
 
-         projection.angle = function(_) {
-           return arguments.length ? (alpha = _ % 360 * radians, recenter()) : alpha * degrees;
-         };
+         ranges = range$1 = null;
+         return lambda0$1 === Infinity || phi0 === Infinity ? [[NaN, NaN], [NaN, NaN]] : [[lambda0$1, phi0], [lambda1, phi1]];
+       }
 
-         projection.reflectX = function(_) {
-           return arguments.length ? (sx = _ ? -1 : 1, recenter()) : sx < 0;
-         };
+       var W0, W1, X0, Y0, Z0, X1, Y1, Z1, X2, Y2, Z2, lambda00$2, phi00$2, // first point
+       x0, y0, z0; // previous point
 
-         projection.reflectY = function(_) {
-           return arguments.length ? (sy = _ ? -1 : 1, recenter()) : sy < 0;
-         };
+       var centroidStream = {
+         sphere: noop,
+         point: centroidPoint,
+         lineStart: centroidLineStart,
+         lineEnd: centroidLineEnd,
+         polygonStart: function polygonStart() {
+           centroidStream.lineStart = centroidRingStart;
+           centroidStream.lineEnd = centroidRingEnd;
+         },
+         polygonEnd: function polygonEnd() {
+           centroidStream.lineStart = centroidLineStart;
+           centroidStream.lineEnd = centroidLineEnd;
+         }
+       }; // Arithmetic mean of Cartesian vectors.
 
-         projection.precision = function(_) {
-           return arguments.length ? (projectResample = resample(projectTransform, delta2 = _ * _), reset()) : sqrt(delta2);
-         };
+       function centroidPoint(lambda, phi) {
+         lambda *= radians, phi *= radians;
+         var cosPhi = cos(phi);
+         centroidPointCartesian(cosPhi * cos(lambda), cosPhi * sin(lambda), sin(phi));
+       }
 
-         projection.fitExtent = function(extent, object) {
-           return fitExtent(projection, extent, object);
-         };
+       function centroidPointCartesian(x, y, z) {
+         ++W0;
+         X0 += (x - X0) / W0;
+         Y0 += (y - Y0) / W0;
+         Z0 += (z - Z0) / W0;
+       }
 
-         projection.fitSize = function(size, object) {
-           return fitSize(projection, size, object);
-         };
+       function centroidLineStart() {
+         centroidStream.point = centroidLinePointFirst;
+       }
 
-         projection.fitWidth = function(width, object) {
-           return fitWidth(projection, width, object);
-         };
+       function centroidLinePointFirst(lambda, phi) {
+         lambda *= radians, phi *= radians;
+         var cosPhi = cos(phi);
+         x0 = cosPhi * cos(lambda);
+         y0 = cosPhi * sin(lambda);
+         z0 = sin(phi);
+         centroidStream.point = centroidLinePoint;
+         centroidPointCartesian(x0, y0, z0);
+       }
 
-         projection.fitHeight = function(height, object) {
-           return fitHeight(projection, height, object);
-         };
+       function centroidLinePoint(lambda, phi) {
+         lambda *= radians, phi *= radians;
+         var cosPhi = cos(phi),
+             x = cosPhi * cos(lambda),
+             y = cosPhi * sin(lambda),
+             z = sin(phi),
+             w = atan2(sqrt$1((w = y0 * z - z0 * y) * w + (w = z0 * x - x0 * z) * w + (w = x0 * y - y0 * x) * w), x0 * x + y0 * y + z0 * z);
+         W1 += w;
+         X1 += w * (x0 + (x0 = x));
+         Y1 += w * (y0 + (y0 = y));
+         Z1 += w * (z0 + (z0 = z));
+         centroidPointCartesian(x0, y0, z0);
+       }
 
-         function recenter() {
-           var center = scaleTranslateRotate(k, 0, 0, sx, sy, alpha).apply(null, project(lambda, phi)),
-               transform = (alpha ? scaleTranslateRotate : scaleTranslate)(k, x - center[0], y - center[1], sx, sy, alpha);
-           rotate = rotateRadians(deltaLambda, deltaPhi, deltaGamma);
-           projectTransform = compose(project, transform);
-           projectRotateTransform = compose(rotate, projectTransform);
-           projectResample = resample(projectTransform, delta2);
-           return reset();
-         }
+       function centroidLineEnd() {
+         centroidStream.point = centroidPoint;
+       } // See J. E. Brock, The Inertia Tensor for a Spherical Triangle,
+       // J. Applied Mechanics 42, 239 (1975).
 
-         function reset() {
-           cache = cacheStream = null;
-           return projection;
-         }
 
-         return function() {
-           project = projectAt.apply(this, arguments);
-           projection.invert = project.invert && invert;
-           return recenter();
-         };
+       function centroidRingStart() {
+         centroidStream.point = centroidRingPointFirst;
        }
 
-       function mercatorRaw(lambda, phi) {
-         return [lambda, log(tan((halfPi + phi) / 2))];
+       function centroidRingEnd() {
+         centroidRingPoint(lambda00$2, phi00$2);
+         centroidStream.point = centroidPoint;
        }
 
-       mercatorRaw.invert = function(x, y) {
-         return [x, 2 * atan(exp(y)) - halfPi];
-       };
-
-       function mercator() {
-         return mercatorProjection(mercatorRaw)
-             .scale(961 / tau);
+       function centroidRingPointFirst(lambda, phi) {
+         lambda00$2 = lambda, phi00$2 = phi;
+         lambda *= radians, phi *= radians;
+         centroidStream.point = centroidRingPoint;
+         var cosPhi = cos(phi);
+         x0 = cosPhi * cos(lambda);
+         y0 = cosPhi * sin(lambda);
+         z0 = sin(phi);
+         centroidPointCartesian(x0, y0, z0);
        }
 
-       function mercatorProjection(project) {
-         var m = projection(project),
-             center = m.center,
-             scale = m.scale,
-             translate = m.translate,
-             clipExtent = m.clipExtent,
-             x0 = null, y0, x1, y1; // clip extent
-
-         m.scale = function(_) {
-           return arguments.length ? (scale(_), reclip()) : scale();
-         };
+       function centroidRingPoint(lambda, phi) {
+         lambda *= radians, phi *= radians;
+         var cosPhi = cos(phi),
+             x = cosPhi * cos(lambda),
+             y = cosPhi * sin(lambda),
+             z = sin(phi),
+             cx = y0 * z - z0 * y,
+             cy = z0 * x - x0 * z,
+             cz = x0 * y - y0 * x,
+             m = hypot(cx, cy, cz),
+             w = asin(m),
+             // line weight = angle
+         v = m && -w / m; // area weight multiplier
+
+         X2.add(v * cx);
+         Y2.add(v * cy);
+         Z2.add(v * cz);
+         W1 += w;
+         X1 += w * (x0 + (x0 = x));
+         Y1 += w * (y0 + (y0 = y));
+         Z1 += w * (z0 + (z0 = z));
+         centroidPointCartesian(x0, y0, z0);
+       }
 
-         m.translate = function(_) {
-           return arguments.length ? (translate(_), reclip()) : translate();
-         };
+       function d3_geoCentroid (object) {
+         W0 = W1 = X0 = Y0 = Z0 = X1 = Y1 = Z1 = 0;
+         X2 = new Adder();
+         Y2 = new Adder();
+         Z2 = new Adder();
+         d3_geoStream(object, centroidStream);
+         var x = +X2,
+             y = +Y2,
+             z = +Z2,
+             m = hypot(x, y, z); // If the area-weighted ccentroid is undefined, fall back to length-weighted ccentroid.
 
-         m.center = function(_) {
-           return arguments.length ? (center(_), reclip()) : center();
-         };
+         if (m < epsilon2) {
+           x = X1, y = Y1, z = Z1; // If the feature has zero length, fall back to arithmetic mean of point vectors.
 
-         m.clipExtent = function(_) {
-           return arguments.length ? ((_ == null ? x0 = y0 = x1 = y1 = null : (x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1])), reclip()) : x0 == null ? null : [[x0, y0], [x1, y1]];
-         };
+           if (W1 < epsilon) x = X0, y = Y0, z = Z0;
+           m = hypot(x, y, z); // If the feature still has an undefined ccentroid, then return.
 
-         function reclip() {
-           var k = pi * scale(),
-               t = m(rotation(m.rotate()).invert([0, 0]));
-           return clipExtent(x0 == null
-               ? [[t[0] - k, t[1] - k], [t[0] + k, t[1] + k]] : project === mercatorRaw
-               ? [[Math.max(t[0] - k, x0), y0], [Math.min(t[0] + k, x1), y1]]
-               : [[x0, Math.max(t[1] - k, y0)], [x1, Math.min(t[1] + k, y1)]]);
+           if (m < epsilon2) return [NaN, NaN];
          }
 
-         return reclip();
+         return [atan2(y, x) * degrees, asin(z / m) * degrees];
        }
 
-       function d3_geoIdentity() {
-         var k = 1, tx = 0, ty = 0, sx = 1, sy = 1, // scale, translate and reflect
-             alpha = 0, ca, sa, // angle
-             x0 = null, y0, x1, y1, // clip extent
-             kx = 1, ky = 1,
-             transform = transformer({
-               point: function(x, y) {
-                 var p = projection([x, y]);
-                 this.stream.point(p[0], p[1]);
-               }
-             }),
-             postclip = identity,
-             cache,
-             cacheStream;
-
-         function reset() {
-           kx = k * sx;
-           ky = k * sy;
-           cache = cacheStream = null;
-           return projection;
+       function compose (a, b) {
+         function compose(x, y) {
+           return x = a(x, y), b(x[0], x[1]);
          }
 
-         function projection (p) {
-           var x = p[0] * kx, y = p[1] * ky;
-           if (alpha) {
-             var t = y * ca - x * sa;
-             x = x * ca + y * sa;
-             y = t;
-           }    
-           return [x + tx, y + ty];
-         }
-         projection.invert = function(p) {
-           var x = p[0] - tx, y = p[1] - ty;
-           if (alpha) {
-             var t = y * ca + x * sa;
-             x = x * ca - y * sa;
-             y = t;
-           }
-           return [x / kx, y / ky];
-         };
-         projection.stream = function(stream) {
-           return cache && cacheStream === stream ? cache : cache = transform(postclip(cacheStream = stream));
-         };
-         projection.postclip = function(_) {
-           return arguments.length ? (postclip = _, x0 = y0 = x1 = y1 = null, reset()) : postclip;
-         };
-         projection.clipExtent = function(_) {
-           return arguments.length ? (postclip = _ == null ? (x0 = y0 = x1 = y1 = null, identity) : clipRectangle(x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reset()) : x0 == null ? null : [[x0, y0], [x1, y1]];
-         };
-         projection.scale = function(_) {
-           return arguments.length ? (k = +_, reset()) : k;
-         };
-         projection.translate = function(_) {
-           return arguments.length ? (tx = +_[0], ty = +_[1], reset()) : [tx, ty];
-         };
-         projection.angle = function(_) {
-           return arguments.length ? (alpha = _ % 360 * radians, sa = sin(alpha), ca = cos(alpha), reset()) : alpha * degrees;
-         };
-         projection.reflectX = function(_) {
-           return arguments.length ? (sx = _ ? -1 : 1, reset()) : sx < 0;
-         };
-         projection.reflectY = function(_) {
-           return arguments.length ? (sy = _ ? -1 : 1, reset()) : sy < 0;
-         };
-         projection.fitExtent = function(extent, object) {
-           return fitExtent(projection, extent, object);
-         };
-         projection.fitSize = function(size, object) {
-           return fitSize(projection, size, object);
-         };
-         projection.fitWidth = function(width, object) {
-           return fitWidth(projection, width, object);
-         };
-         projection.fitHeight = function(height, object) {
-           return fitHeight(projection, height, object);
+         if (a.invert && b.invert) compose.invert = function (x, y) {
+           return x = b.invert(x, y), x && a.invert(x[0], x[1]);
          };
-
-         return projection;
+         return compose;
        }
 
-       // constants
-       var TAU = 2 * Math.PI;
-       var EQUATORIAL_RADIUS = 6356752.314245179;
-       var POLAR_RADIUS = 6378137.0;
-
-
-       function geoLatToMeters(dLat) {
-           return dLat * (TAU * POLAR_RADIUS / 360);
+       function rotationIdentity(lambda, phi) {
+         return [abs$2(lambda) > pi ? lambda + Math.round(-lambda / tau) * tau : lambda, phi];
        }
 
-
-       function geoLonToMeters(dLon, atLat) {
-           return Math.abs(atLat) >= 90 ? 0 :
-               dLon * (TAU * EQUATORIAL_RADIUS / 360) * Math.abs(Math.cos(atLat * (Math.PI / 180)));
+       rotationIdentity.invert = rotationIdentity;
+       function rotateRadians(deltaLambda, deltaPhi, deltaGamma) {
+         return (deltaLambda %= tau) ? deltaPhi || deltaGamma ? compose(rotationLambda(deltaLambda), rotationPhiGamma(deltaPhi, deltaGamma)) : rotationLambda(deltaLambda) : deltaPhi || deltaGamma ? rotationPhiGamma(deltaPhi, deltaGamma) : rotationIdentity;
        }
 
-
-       function geoMetersToLat(m) {
-           return m / (TAU * POLAR_RADIUS / 360);
+       function forwardRotationLambda(deltaLambda) {
+         return function (lambda, phi) {
+           return lambda += deltaLambda, [lambda > pi ? lambda - tau : lambda < -pi ? lambda + tau : lambda, phi];
+         };
        }
 
-
-       function geoMetersToLon(m, atLat) {
-           return Math.abs(atLat) >= 90 ? 0 :
-               m / (TAU * EQUATORIAL_RADIUS / 360) / Math.abs(Math.cos(atLat * (Math.PI / 180)));
+       function rotationLambda(deltaLambda) {
+         var rotation = forwardRotationLambda(deltaLambda);
+         rotation.invert = forwardRotationLambda(-deltaLambda);
+         return rotation;
        }
 
+       function rotationPhiGamma(deltaPhi, deltaGamma) {
+         var cosDeltaPhi = cos(deltaPhi),
+             sinDeltaPhi = sin(deltaPhi),
+             cosDeltaGamma = cos(deltaGamma),
+             sinDeltaGamma = sin(deltaGamma);
 
-       function geoMetersToOffset(meters, tileSize) {
-           tileSize = tileSize || 256;
-           return [
-               meters[0] * tileSize / (TAU * EQUATORIAL_RADIUS),
-               -meters[1] * tileSize / (TAU * POLAR_RADIUS)
-           ];
-       }
+         function rotation(lambda, phi) {
+           var cosPhi = cos(phi),
+               x = cos(lambda) * cosPhi,
+               y = sin(lambda) * cosPhi,
+               z = sin(phi),
+               k = z * cosDeltaPhi + x * sinDeltaPhi;
+           return [atan2(y * cosDeltaGamma - k * sinDeltaGamma, x * cosDeltaPhi - z * sinDeltaPhi), asin(k * cosDeltaGamma + y * sinDeltaGamma)];
+         }
 
+         rotation.invert = function (lambda, phi) {
+           var cosPhi = cos(phi),
+               x = cos(lambda) * cosPhi,
+               y = sin(lambda) * cosPhi,
+               z = sin(phi),
+               k = z * cosDeltaGamma - y * sinDeltaGamma;
+           return [atan2(y * cosDeltaGamma + z * sinDeltaGamma, x * cosDeltaPhi + k * sinDeltaPhi), asin(k * cosDeltaPhi - x * sinDeltaPhi)];
+         };
 
-       function geoOffsetToMeters(offset, tileSize) {
-           tileSize = tileSize || 256;
-           return [
-               offset[0] * TAU * EQUATORIAL_RADIUS / tileSize,
-               -offset[1] * TAU * POLAR_RADIUS / tileSize
-           ];
+         return rotation;
        }
 
+       function rotation (rotate) {
+         rotate = rotateRadians(rotate[0] * radians, rotate[1] * radians, rotate.length > 2 ? rotate[2] * radians : 0);
 
-       // Equirectangular approximation of spherical distances on Earth
-       function geoSphericalDistance(a, b) {
-           var x = geoLonToMeters(a[0] - b[0], (a[1] + b[1]) / 2);
-           var y = geoLatToMeters(a[1] - b[1]);
-           return Math.sqrt((x * x) + (y * y));
-       }
+         function forward(coordinates) {
+           coordinates = rotate(coordinates[0] * radians, coordinates[1] * radians);
+           return coordinates[0] *= degrees, coordinates[1] *= degrees, coordinates;
+         }
 
+         forward.invert = function (coordinates) {
+           coordinates = rotate.invert(coordinates[0] * radians, coordinates[1] * radians);
+           return coordinates[0] *= degrees, coordinates[1] *= degrees, coordinates;
+         };
 
-       // scale to zoom
-       function geoScaleToZoom(k, tileSize) {
-           tileSize = tileSize || 256;
-           var log2ts = Math.log(tileSize) * Math.LOG2E;
-           return Math.log(k * TAU) / Math.LN2 - log2ts;
+         return forward;
        }
 
+       function circleStream(stream, radius, delta, direction, t0, t1) {
+         if (!delta) return;
+         var cosRadius = cos(radius),
+             sinRadius = sin(radius),
+             step = direction * delta;
 
-       // zoom to scale
-       function geoZoomToScale(z, tileSize) {
-           tileSize = tileSize || 256;
-           return tileSize * Math.pow(2, z) / TAU;
-       }
-
+         if (t0 == null) {
+           t0 = radius + direction * tau;
+           t1 = radius - step / 2;
+         } else {
+           t0 = circleRadius(cosRadius, t0);
+           t1 = circleRadius(cosRadius, t1);
+           if (direction > 0 ? t0 < t1 : t0 > t1) t0 += direction * tau;
+         }
 
-       // returns info about the node from `nodes` closest to the given `point`
-       function geoSphericalClosestNode(nodes, point) {
-           var minDistance = Infinity, distance;
-           var indexOfMin;
+         for (var point, t = t0; direction > 0 ? t > t1 : t < t1; t -= step) {
+           point = spherical([cosRadius, -sinRadius * cos(t), -sinRadius * sin(t)]);
+           stream.point(point[0], point[1]);
+         }
+       } // Returns the signed angle of a cartesian point relative to [cosRadius, 0, 0].
 
-           for (var i in nodes) {
-               distance = geoSphericalDistance(nodes[i].loc, point);
-               if (distance < minDistance) {
-                   minDistance = distance;
-                   indexOfMin = i;
-               }
-           }
+       function circleRadius(cosRadius, point) {
+         point = cartesian(point), point[0] -= cosRadius;
+         cartesianNormalizeInPlace(point);
+         var radius = acos(-point[1]);
+         return ((-point[2] < 0 ? -radius : radius) + tau - epsilon) % tau;
+       }
 
-           if (indexOfMin !== undefined) {
-               return { index: indexOfMin, distance: minDistance, node: nodes[indexOfMin] };
-           } else {
-               return null;
+       function clipBuffer () {
+         var lines = [],
+             line;
+         return {
+           point: function point(x, y, m) {
+             line.push([x, y, m]);
+           },
+           lineStart: function lineStart() {
+             lines.push(line = []);
+           },
+           lineEnd: noop,
+           rejoin: function rejoin() {
+             if (lines.length > 1) lines.push(lines.pop().concat(lines.shift()));
+           },
+           result: function result() {
+             var result = lines;
+             lines = [];
+             line = null;
+             return result;
            }
+         };
        }
 
-       function geoExtent(min, max) {
-           if (!(this instanceof geoExtent)) {
-               return new geoExtent(min, max);
-           } else if (min instanceof geoExtent) {
-               return min;
-           } else if (min && min.length === 2 && min[0].length === 2 && min[1].length === 2) {
-               this[0] = min[0];
-               this[1] = min[1];
-           } else {
-               this[0] = min        || [ Infinity,  Infinity];
-               this[1] = max || min || [-Infinity, -Infinity];
-           }
+       function pointEqual (a, b) {
+         return abs$2(a[0] - b[0]) < epsilon && abs$2(a[1] - b[1]) < epsilon;
        }
 
-       geoExtent.prototype = new Array(2);
-
-       Object.assign(geoExtent.prototype, {
-
-           equals: function (obj) {
-               return this[0][0] === obj[0][0] &&
-                   this[0][1] === obj[0][1] &&
-                   this[1][0] === obj[1][0] &&
-                   this[1][1] === obj[1][1];
-           },
-
-
-           extend: function(obj) {
-               if (!(obj instanceof geoExtent)) obj = new geoExtent(obj);
-               return geoExtent(
-                   [Math.min(obj[0][0], this[0][0]), Math.min(obj[0][1], this[0][1])],
-                   [Math.max(obj[1][0], this[1][0]), Math.max(obj[1][1], this[1][1])]
-               );
-           },
-
-
-           _extend: function(extent) {
-               this[0][0] = Math.min(extent[0][0], this[0][0]);
-               this[0][1] = Math.min(extent[0][1], this[0][1]);
-               this[1][0] = Math.max(extent[1][0], this[1][0]);
-               this[1][1] = Math.max(extent[1][1], this[1][1]);
-           },
-
+       function Intersection(point, points, other, entry) {
+         this.x = point;
+         this.z = points;
+         this.o = other; // another intersection
 
-           area: function() {
-               return Math.abs((this[1][0] - this[0][0]) * (this[1][1] - this[0][1]));
-           },
+         this.e = entry; // is an entry?
 
+         this.v = false; // visited
 
-           center: function() {
-               return [(this[0][0] + this[1][0]) / 2, (this[0][1] + this[1][1]) / 2];
-           },
+         this.n = this.p = null; // next & previous
+       } // A generalized polygon clipping algorithm: given a polygon that has been cut
+       // into its visible line segments, and rejoins the segments by interpolating
+       // along the clip edge.
 
 
-           rectangle: function() {
-               return [this[0][0], this[0][1], this[1][0], this[1][1]];
-           },
+       function clipRejoin (segments, compareIntersection, startInside, interpolate, stream) {
+         var subject = [],
+             clip = [],
+             i,
+             n;
+         segments.forEach(function (segment) {
+           if ((n = segment.length - 1) <= 0) return;
+           var n,
+               p0 = segment[0],
+               p1 = segment[n],
+               x;
 
+           if (pointEqual(p0, p1)) {
+             if (!p0[2] && !p1[2]) {
+               stream.lineStart();
 
-           bbox: function() {
-               return { minX: this[0][0], minY: this[0][1], maxX: this[1][0], maxY: this[1][1] };
-           },
+               for (i = 0; i < n; ++i) {
+                 stream.point((p0 = segment[i])[0], p0[1]);
+               }
 
+               stream.lineEnd();
+               return;
+             } // handle degenerate cases by moving the point
 
-           polygon: function() {
-               return [
-                   [this[0][0], this[0][1]],
-                   [this[0][0], this[1][1]],
-                   [this[1][0], this[1][1]],
-                   [this[1][0], this[0][1]],
-                   [this[0][0], this[0][1]]
-               ];
-           },
 
+             p1[0] += 2 * epsilon;
+           }
 
-           contains: function(obj) {
-               if (!(obj instanceof geoExtent)) obj = new geoExtent(obj);
-               return obj[0][0] >= this[0][0] &&
-                      obj[0][1] >= this[0][1] &&
-                      obj[1][0] <= this[1][0] &&
-                      obj[1][1] <= this[1][1];
-           },
+           subject.push(x = new Intersection(p0, segment, null, true));
+           clip.push(x.o = new Intersection(p0, null, x, false));
+           subject.push(x = new Intersection(p1, segment, null, false));
+           clip.push(x.o = new Intersection(p1, null, x, true));
+         });
+         if (!subject.length) return;
+         clip.sort(compareIntersection);
+         link(subject);
+         link(clip);
 
+         for (i = 0, n = clip.length; i < n; ++i) {
+           clip[i].e = startInside = !startInside;
+         }
 
-           intersects: function(obj) {
-               if (!(obj instanceof geoExtent)) obj = new geoExtent(obj);
-               return obj[0][0] <= this[1][0] &&
-                      obj[0][1] <= this[1][1] &&
-                      obj[1][0] >= this[0][0] &&
-                      obj[1][1] >= this[0][1];
-           },
+         var start = subject[0],
+             points,
+             point;
 
+         while (1) {
+           // Find first unvisited intersection.
+           var current = start,
+               isSubject = true;
 
-           intersection: function(obj) {
-               if (!this.intersects(obj)) return new geoExtent();
-               return new geoExtent(
-                   [Math.max(obj[0][0], this[0][0]), Math.max(obj[0][1], this[0][1])],
-                   [Math.min(obj[1][0], this[1][0]), Math.min(obj[1][1], this[1][1])]
-               );
-           },
+           while (current.v) {
+             if ((current = current.n) === start) return;
+           }
 
+           points = current.z;
+           stream.lineStart();
 
-           percentContainedIn: function(obj) {
-               if (!(obj instanceof geoExtent)) obj = new geoExtent(obj);
-               var a1 = this.intersection(obj).area();
-               var a2 = this.area();
+           do {
+             current.v = current.o.v = true;
 
-               if (a1 === Infinity || a2 === Infinity) {
-                   return 0;
-               } else if (a1 === 0 || a2 === 0) {
-                   if (obj.contains(this)) {
-                       return 1;
-                   }
-                   return 0;
+             if (current.e) {
+               if (isSubject) {
+                 for (i = 0, n = points.length; i < n; ++i) {
+                   stream.point((point = points[i])[0], point[1]);
+                 }
                } else {
-                   return a1 / a2;
+                 interpolate(current.x, current.n.x, 1, stream);
                }
-           },
-
-
-           padByMeters: function(meters) {
-               var dLat = geoMetersToLat(meters);
-               var dLon = geoMetersToLon(meters, this.center()[1]);
-               return geoExtent(
-                   [this[0][0] - dLon, this[0][1] - dLat],
-                   [this[1][0] + dLon, this[1][1] + dLat]
-               );
-           },
 
+               current = current.n;
+             } else {
+               if (isSubject) {
+                 points = current.p.z;
 
-           toParam: function() {
-               return this.rectangle().join(',');
-           }
+                 for (i = points.length - 1; i >= 0; --i) {
+                   stream.point((point = points[i])[0], point[1]);
+                 }
+               } else {
+                 interpolate(current.x, current.p.x, -1, stream);
+               }
 
-       });
+               current = current.p;
+             }
 
-       function d3_polygonArea(polygon) {
-         var i = -1,
-             n = polygon.length,
-             a,
-             b = polygon[n - 1],
-             area = 0;
+             current = current.o;
+             points = current.z;
+             isSubject = !isSubject;
+           } while (!current.v);
 
-         while (++i < n) {
-           a = b;
-           b = polygon[i];
-           area += a[1] * b[0] - a[0] * b[1];
+           stream.lineEnd();
          }
-
-         return area / 2;
        }
 
-       function d3_polygonCentroid(polygon) {
-         var i = -1,
-             n = polygon.length,
-             x = 0,
-             y = 0,
-             a,
-             b = polygon[n - 1],
-             c,
-             k = 0;
+       function link(array) {
+         if (!(n = array.length)) return;
+         var n,
+             i = 0,
+             a = array[0],
+             b;
 
          while (++i < n) {
+           a.n = b = array[i];
+           b.p = a;
            a = b;
-           b = polygon[i];
-           k += c = a[0] * b[1] - b[0] * a[1];
-           x += (a[0] + b[0]) * c;
-           y += (a[1] + b[1]) * c;
          }
 
-         return k *= 3, [x / k, y / k];
+         a.n = b = array[0];
+         b.p = a;
        }
 
-       // Returns the 2D cross product of AB and AC vectors, i.e., the z-component of
-       // the 3D cross product in a quadrant I Cartesian coordinate system (+x is
-       // right, +y is up). Returns a positive value if ABC is counter-clockwise,
-       // negative if clockwise, and zero if the points are collinear.
-       function cross(a, b, c) {
-         return (b[0] - a[0]) * (c[1] - a[1]) - (b[1] - a[1]) * (c[0] - a[0]);
+       function longitude(point) {
+         if (abs$2(point[0]) <= pi) return point[0];else return sign(point[0]) * ((abs$2(point[0]) + pi) % tau - pi);
        }
 
-       function lexicographicOrder(a, b) {
-         return a[0] - b[0] || a[1] - b[1];
-       }
+       function polygonContains (polygon, point) {
+         var lambda = longitude(point),
+             phi = point[1],
+             sinPhi = sin(phi),
+             normal = [sin(lambda), -cos(lambda), 0],
+             angle = 0,
+             winding = 0;
+         var sum = new Adder();
+         if (sinPhi === 1) phi = halfPi + epsilon;else if (sinPhi === -1) phi = -halfPi - epsilon;
 
-       // Computes the upper convex hull per the monotone chain algorithm.
-       // Assumes points.length >= 3, is sorted by x, unique in y.
-       // Returns an array of indices into points in left-to-right order.
-       function computeUpperHullIndexes(points) {
-         var n = points.length,
-             indexes = [0, 1],
-             size = 2;
+         for (var i = 0, n = polygon.length; i < n; ++i) {
+           if (!(m = (ring = polygon[i]).length)) continue;
+           var ring,
+               m,
+               point0 = ring[m - 1],
+               lambda0 = longitude(point0),
+               phi0 = point0[1] / 2 + quarterPi,
+               sinPhi0 = sin(phi0),
+               cosPhi0 = cos(phi0);
 
-         for (var i = 2; i < n; ++i) {
-           while (size > 1 && cross(points[indexes[size - 2]], points[indexes[size - 1]], points[i]) <= 0) --size;
-           indexes[size++] = i;
-         }
+           for (var j = 0; j < m; ++j, lambda0 = lambda1, sinPhi0 = sinPhi1, cosPhi0 = cosPhi1, point0 = point1) {
+             var point1 = ring[j],
+                 lambda1 = longitude(point1),
+                 phi1 = point1[1] / 2 + quarterPi,
+                 sinPhi1 = sin(phi1),
+                 cosPhi1 = cos(phi1),
+                 delta = lambda1 - lambda0,
+                 sign = delta >= 0 ? 1 : -1,
+                 absDelta = sign * delta,
+                 antimeridian = absDelta > pi,
+                 k = sinPhi0 * sinPhi1;
+             sum.add(atan2(k * sign * sin(absDelta), cosPhi0 * cosPhi1 + k * cos(absDelta)));
+             angle += antimeridian ? delta + sign * tau : delta; // Are the longitudes either side of the point’s meridian (lambda),
+             // and are the latitudes smaller than the parallel (phi)?
 
-         return indexes.slice(0, size); // remove popped points
+             if (antimeridian ^ lambda0 >= lambda ^ lambda1 >= lambda) {
+               var arc = cartesianCross(cartesian(point0), cartesian(point1));
+               cartesianNormalizeInPlace(arc);
+               var intersection = cartesianCross(normal, arc);
+               cartesianNormalizeInPlace(intersection);
+               var phiArc = (antimeridian ^ delta >= 0 ? -1 : 1) * asin(intersection[2]);
+
+               if (phi > phiArc || phi === phiArc && (arc[0] || arc[1])) {
+                 winding += antimeridian ^ delta >= 0 ? 1 : -1;
+               }
+             }
+           }
+         } // First, determine whether the South pole is inside or outside:
+         //
+         // It is inside if:
+         // * the polygon winds around it in a clockwise direction.
+         // * the polygon does not (cumulatively) wind around it, but has a negative
+         //   (counter-clockwise) area.
+         //
+         // Second, count the (signed) number of times a segment crosses a lambda
+         // from the point to the South pole.  If it is zero, then the point is the
+         // same side as the South pole.
+
+
+         return (angle < -epsilon || angle < epsilon && sum < -epsilon2) ^ winding & 1;
        }
 
-       function d3_polygonHull(points) {
-         if ((n = points.length) < 3) return null;
+       function clip (pointVisible, clipLine, interpolate, start) {
+         return function (sink) {
+           var line = clipLine(sink),
+               ringBuffer = clipBuffer(),
+               ringSink = clipLine(ringBuffer),
+               polygonStarted = false,
+               polygon,
+               segments,
+               ring;
+           var clip = {
+             point: point,
+             lineStart: lineStart,
+             lineEnd: lineEnd,
+             polygonStart: function polygonStart() {
+               clip.point = pointRing;
+               clip.lineStart = ringStart;
+               clip.lineEnd = ringEnd;
+               segments = [];
+               polygon = [];
+             },
+             polygonEnd: function polygonEnd() {
+               clip.point = point;
+               clip.lineStart = lineStart;
+               clip.lineEnd = lineEnd;
+               segments = merge(segments);
+               var startInside = polygonContains(polygon, start);
 
-         var i,
-             n,
-             sortedPoints = new Array(n),
-             flippedPoints = new Array(n);
+               if (segments.length) {
+                 if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
+                 clipRejoin(segments, compareIntersection, startInside, interpolate, sink);
+               } else if (startInside) {
+                 if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
+                 sink.lineStart();
+                 interpolate(null, null, 1, sink);
+                 sink.lineEnd();
+               }
 
-         for (i = 0; i < n; ++i) sortedPoints[i] = [+points[i][0], +points[i][1], i];
-         sortedPoints.sort(lexicographicOrder);
-         for (i = 0; i < n; ++i) flippedPoints[i] = [sortedPoints[i][0], -sortedPoints[i][1]];
+               if (polygonStarted) sink.polygonEnd(), polygonStarted = false;
+               segments = polygon = null;
+             },
+             sphere: function sphere() {
+               sink.polygonStart();
+               sink.lineStart();
+               interpolate(null, null, 1, sink);
+               sink.lineEnd();
+               sink.polygonEnd();
+             }
+           };
 
-         var upperIndexes = computeUpperHullIndexes(sortedPoints),
-             lowerIndexes = computeUpperHullIndexes(flippedPoints);
+           function point(lambda, phi) {
+             if (pointVisible(lambda, phi)) sink.point(lambda, phi);
+           }
 
-         // Construct the hull polygon, removing possible duplicate endpoints.
-         var skipLeft = lowerIndexes[0] === upperIndexes[0],
-             skipRight = lowerIndexes[lowerIndexes.length - 1] === upperIndexes[upperIndexes.length - 1],
-             hull = [];
+           function pointLine(lambda, phi) {
+             line.point(lambda, phi);
+           }
 
-         // Add upper hull in right-to-l order.
-         // Then add lower hull in left-to-right order.
-         for (i = upperIndexes.length - 1; i >= 0; --i) hull.push(points[sortedPoints[upperIndexes[i]][2]]);
-         for (i = +skipLeft; i < lowerIndexes.length - skipRight; ++i) hull.push(points[sortedPoints[lowerIndexes[i]][2]]);
+           function lineStart() {
+             clip.point = pointLine;
+             line.lineStart();
+           }
 
-         return hull;
-       }
+           function lineEnd() {
+             clip.point = point;
+             line.lineEnd();
+           }
 
-       // vector equals
-       function geoVecEqual(a, b, epsilon) {
-           if (epsilon) {
-               return (Math.abs(a[0] - b[0]) <= epsilon) && (Math.abs(a[1] - b[1]) <= epsilon);
-           } else {
-               return (a[0] === b[0]) && (a[1] === b[1]);
+           function pointRing(lambda, phi) {
+             ring.push([lambda, phi]);
+             ringSink.point(lambda, phi);
            }
-       }
 
-       // vector addition
-       function geoVecAdd(a, b) {
-           return [ a[0] + b[0], a[1] + b[1] ];
-       }
+           function ringStart() {
+             ringSink.lineStart();
+             ring = [];
+           }
 
-       // vector subtraction
-       function geoVecSubtract(a, b) {
-           return [ a[0] - b[0], a[1] - b[1] ];
-       }
+           function ringEnd() {
+             pointRing(ring[0][0], ring[0][1]);
+             ringSink.lineEnd();
+             var clean = ringSink.clean(),
+                 ringSegments = ringBuffer.result(),
+                 i,
+                 n = ringSegments.length,
+                 m,
+                 segment,
+                 point;
+             ring.pop();
+             polygon.push(ring);
+             ring = null;
+             if (!n) return; // No intersections.
 
-       // vector scaling
-       function geoVecScale(a, mag) {
-           return [ a[0] * mag, a[1] * mag ];
-       }
+             if (clean & 1) {
+               segment = ringSegments[0];
 
-       // vector rounding (was: geoRoundCoordinates)
-       function geoVecFloor(a) {
-           return [ Math.floor(a[0]), Math.floor(a[1]) ];
-       }
+               if ((m = segment.length - 1) > 0) {
+                 if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
+                 sink.lineStart();
 
-       // linear interpolation
-       function geoVecInterp(a, b, t) {
-           return [
-               a[0] + (b[0] - a[0]) * t,
-               a[1] + (b[1] - a[1]) * t
-           ];
-       }
+                 for (i = 0; i < m; ++i) {
+                   sink.point((point = segment[i])[0], point[1]);
+                 }
 
-       // http://jsperf.com/id-dist-optimization
-       function geoVecLength(a, b) {
-           return Math.sqrt(geoVecLengthSquare(a,b));
-       }
+                 sink.lineEnd();
+               }
 
-       // length of vector raised to the power two
-       function geoVecLengthSquare(a, b) {
-           b = b || [0, 0];
-           var x = a[0] - b[0];
-           var y = a[1] - b[1];
-           return (x * x) + (y * y);
-       }
+               return;
+             } // Rejoin connected segments.
+             // TODO reuse ringBuffer.rejoin()?
 
-       // get a unit vector
-       function geoVecNormalize(a) {
-           var length = Math.sqrt((a[0] * a[0]) + (a[1] * a[1]));
-           if (length !== 0) {
-               return geoVecScale(a, 1 / length);
+
+             if (n > 1 && clean & 2) ringSegments.push(ringSegments.pop().concat(ringSegments.shift()));
+             segments.push(ringSegments.filter(validSegment));
            }
-           return [0, 0];
-       }
 
-       // Return the counterclockwise angle in the range (-pi, pi)
-       // between the positive X axis and the line intersecting a and b.
-       function geoVecAngle(a, b) {
-           return Math.atan2(b[1] - a[1], b[0] - a[0]);
+           return clip;
+         };
        }
 
-       // dot product
-       function geoVecDot(a, b, origin) {
-           origin = origin || [0, 0];
-           var p = geoVecSubtract(a, origin);
-           var q = geoVecSubtract(b, origin);
-           return (p[0]) * (q[0]) + (p[1]) * (q[1]);
-       }
+       function validSegment(segment) {
+         return segment.length > 1;
+       } // Intersections are sorted along the clip edge. For both antimeridian cutting
+       // and circle clipping, the same comparison is used.
 
-       // normalized dot product
-       function geoVecNormalizedDot(a, b, origin) {
-           origin = origin || [0, 0];
-           var p = geoVecNormalize(geoVecSubtract(a, origin));
-           var q = geoVecNormalize(geoVecSubtract(b, origin));
-           return geoVecDot(p, q);
-       }
 
-       // 2D cross product of OA and OB vectors, returns magnitude of Z vector
-       // Returns a positive value, if OAB makes a counter-clockwise turn,
-       // negative for clockwise turn, and zero if the points are collinear.
-       function geoVecCross(a, b, origin) {
-           origin = origin || [0, 0];
-           var p = geoVecSubtract(a, origin);
-           var q = geoVecSubtract(b, origin);
-           return (p[0]) * (q[1]) - (p[1]) * (q[0]);
+       function compareIntersection(a, b) {
+         return ((a = a.x)[0] < 0 ? a[1] - halfPi - epsilon : halfPi - a[1]) - ((b = b.x)[0] < 0 ? b[1] - halfPi - epsilon : halfPi - b[1]);
        }
 
+       var clipAntimeridian = clip(function () {
+         return true;
+       }, clipAntimeridianLine, clipAntimeridianInterpolate, [-pi, -halfPi]); // Takes a line and cuts into visible segments. Return values: 0 - there were
+       // intersections or the line was empty; 1 - no intersections; 2 - there were
+       // intersections, and the first and last segments should be rejoined.
 
-       // find closest orthogonal projection of point onto points array
-       function geoVecProject(a, points) {
-           var min = Infinity;
-           var idx;
-           var target;
-
-           for (var i = 0; i < points.length - 1; i++) {
-               var o = points[i];
-               var s = geoVecSubtract(points[i + 1], o);
-               var v = geoVecSubtract(a, o);
-               var proj = geoVecDot(v, s) / geoVecDot(s, s);
-               var p;
-
-               if (proj < 0) {
-                   p = o;
-               } else if (proj > 1) {
-                   p = points[i + 1];
-               } else {
-                   p = [o[0] + proj * s[0], o[1] + proj * s[1]];
-               }
+       function clipAntimeridianLine(stream) {
+         var lambda0 = NaN,
+             phi0 = NaN,
+             sign0 = NaN,
+             _clean; // no intersections
 
-               var dist = geoVecLength(p, a);
-               if (dist < min) {
-                   min = dist;
-                   idx = i + 1;
-                   target = p;
-               }
-           }
 
-           if (idx !== undefined) {
-               return { index: idx, distance: min, target: target };
-           } else {
-               return null;
+         return {
+           lineStart: function lineStart() {
+             stream.lineStart();
+             _clean = 1;
+           },
+           point: function point(lambda1, phi1) {
+             var sign1 = lambda1 > 0 ? pi : -pi,
+                 delta = abs$2(lambda1 - lambda0);
+
+             if (abs$2(delta - pi) < epsilon) {
+               // line crosses a pole
+               stream.point(lambda0, phi0 = (phi0 + phi1) / 2 > 0 ? halfPi : -halfPi);
+               stream.point(sign0, phi0);
+               stream.lineEnd();
+               stream.lineStart();
+               stream.point(sign1, phi0);
+               stream.point(lambda1, phi0);
+               _clean = 0;
+             } else if (sign0 !== sign1 && delta >= pi) {
+               // line crosses antimeridian
+               if (abs$2(lambda0 - sign0) < epsilon) lambda0 -= sign0 * epsilon; // handle degeneracies
+
+               if (abs$2(lambda1 - sign1) < epsilon) lambda1 -= sign1 * epsilon;
+               phi0 = clipAntimeridianIntersect(lambda0, phi0, lambda1, phi1);
+               stream.point(sign0, phi0);
+               stream.lineEnd();
+               stream.lineStart();
+               stream.point(sign1, phi0);
+               _clean = 0;
+             }
+
+             stream.point(lambda0 = lambda1, phi0 = phi1);
+             sign0 = sign1;
+           },
+           lineEnd: function lineEnd() {
+             stream.lineEnd();
+             lambda0 = phi0 = NaN;
+           },
+           clean: function clean() {
+             return 2 - _clean; // if intersections, rejoin first and last segments
            }
+         };
        }
 
-       // Return the counterclockwise angle in the range (-pi, pi)
-       // between the positive X axis and the line intersecting a and b.
-       function geoAngle(a, b, projection) {
-           return geoVecAngle(projection(a.loc), projection(b.loc));
+       function clipAntimeridianIntersect(lambda0, phi0, lambda1, phi1) {
+         var cosPhi0,
+             cosPhi1,
+             sinLambda0Lambda1 = sin(lambda0 - lambda1);
+         return abs$2(sinLambda0Lambda1) > epsilon ? atan((sin(phi0) * (cosPhi1 = cos(phi1)) * sin(lambda1) - sin(phi1) * (cosPhi0 = cos(phi0)) * sin(lambda0)) / (cosPhi0 * cosPhi1 * sinLambda0Lambda1)) : (phi0 + phi1) / 2;
        }
 
+       function clipAntimeridianInterpolate(from, to, direction, stream) {
+         var phi;
 
-       function geoEdgeEqual(a, b) {
-           return (a[0] === b[0] && a[1] === b[1]) ||
-               (a[0] === b[1] && a[1] === b[0]);
+         if (from == null) {
+           phi = direction * halfPi;
+           stream.point(-pi, phi);
+           stream.point(0, phi);
+           stream.point(pi, phi);
+           stream.point(pi, 0);
+           stream.point(pi, -phi);
+           stream.point(0, -phi);
+           stream.point(-pi, -phi);
+           stream.point(-pi, 0);
+           stream.point(-pi, phi);
+         } else if (abs$2(from[0] - to[0]) > epsilon) {
+           var lambda = from[0] < to[0] ? pi : -pi;
+           phi = direction * lambda / 2;
+           stream.point(-lambda, phi);
+           stream.point(0, phi);
+           stream.point(lambda, phi);
+         } else {
+           stream.point(to[0], to[1]);
+         }
        }
 
+       function clipCircle (radius) {
+         var cr = cos(radius),
+             delta = 6 * radians,
+             smallRadius = cr > 0,
+             notHemisphere = abs$2(cr) > epsilon; // TODO optimise for this common case
 
-       // Rotate all points counterclockwise around a pivot point by given angle
-       function geoRotate(points, angle, around) {
-           return points.map(function(point) {
-               var radial = geoVecSubtract(point, around);
-               return [
-                   radial[0] * Math.cos(angle) - radial[1] * Math.sin(angle) + around[0],
-                   radial[0] * Math.sin(angle) + radial[1] * Math.cos(angle) + around[1]
-               ];
-           });
-       }
+         function interpolate(from, to, direction, stream) {
+           circleStream(stream, radius, delta, direction, from, to);
+         }
 
+         function visible(lambda, phi) {
+           return cos(lambda) * cos(phi) > cr;
+         } // Takes a line and cuts into visible segments. Return values used for polygon
+         // clipping: 0 - there were intersections or the line was empty; 1 - no
+         // intersections 2 - there were intersections, and the first and last segments
+         // should be rejoined.
 
-       // Choose the edge with the minimal distance from `point` to its orthogonal
-       // projection onto that edge, if such a projection exists, or the distance to
-       // the closest vertex on that edge. Returns an object with the `index` of the
-       // chosen edge, the chosen `loc` on that edge, and the `distance` to to it.
-       function geoChooseEdge(nodes, point, projection, activeID) {
-           var dist = geoVecLength;
-           var points = nodes.map(function(n) { return projection(n.loc); });
-           var ids = nodes.map(function(n) { return n.id; });
-           var min = Infinity;
-           var idx;
-           var loc;
-
-           for (var i = 0; i < points.length - 1; i++) {
-               if (ids[i] === activeID || ids[i + 1] === activeID) continue;
-
-               var o = points[i];
-               var s = geoVecSubtract(points[i + 1], o);
-               var v = geoVecSubtract(point, o);
-               var proj = geoVecDot(v, s) / geoVecDot(s, s);
-               var p;
-
-               if (proj < 0) {
-                   p = o;
-               } else if (proj > 1) {
-                   p = points[i + 1];
-               } else {
-                   p = [o[0] + proj * s[0], o[1] + proj * s[1]];
-               }
 
-               var d = dist(p, point);
-               if (d < min) {
-                   min = d;
-                   idx = i + 1;
-                   loc = projection.invert(p);
-               }
-           }
+         function clipLine(stream) {
+           var point0, // previous point
+           c0, // code for previous point
+           v0, // visibility of previous point
+           v00, // visibility of first point
+           _clean; // no intersections
 
-           if (idx !== undefined) {
-               return { index: idx, distance: min, loc: loc };
-           } else {
-               return null;
-           }
-       }
 
+           return {
+             lineStart: function lineStart() {
+               v00 = v0 = false;
+               _clean = 1;
+             },
+             point: function point(lambda, phi) {
+               var point1 = [lambda, phi],
+                   point2,
+                   v = visible(lambda, phi),
+                   c = smallRadius ? v ? 0 : code(lambda, phi) : v ? code(lambda + (lambda < 0 ? pi : -pi), phi) : 0;
+               if (!point0 && (v00 = v0 = v)) stream.lineStart();
 
-       // Test active (dragged or drawing) segments against inactive segments
-       // This is used to test e.g. multipolygon rings that cross
-       // `activeNodes` is the ring containing the activeID being dragged.
-       // `inactiveNodes` is the other ring to test against
-       function geoHasLineIntersections(activeNodes, inactiveNodes, activeID) {
-           var actives = [];
-           var inactives = [];
-           var j, k, n1, n2, segment;
-
-           // gather active segments (only segments in activeNodes that contain the activeID)
-           for (j = 0; j < activeNodes.length - 1; j++) {
-               n1 = activeNodes[j];
-               n2 = activeNodes[j+1];
-               segment = [n1.loc, n2.loc];
-               if (n1.id === activeID || n2.id === activeID) {
-                   actives.push(segment);
-               }
-           }
-
-           // gather inactive segments
-           for (j = 0; j < inactiveNodes.length - 1; j++) {
-               n1 = inactiveNodes[j];
-               n2 = inactiveNodes[j+1];
-               segment = [n1.loc, n2.loc];
-               inactives.push(segment);
-           }
-
-           // test
-           for (j = 0; j < actives.length; j++) {
-               for (k = 0; k < inactives.length; k++) {
-                   var p = actives[j];
-                   var q = inactives[k];
-                   var hit = geoLineIntersection(p, q);
-                   if (hit) {
-                       return true;
-                   }
+               if (v !== v0) {
+                 point2 = intersect(point0, point1);
+                 if (!point2 || pointEqual(point0, point2) || pointEqual(point1, point2)) point1[2] = 1;
                }
-           }
 
-           return false;
-       }
+               if (v !== v0) {
+                 _clean = 0;
 
+                 if (v) {
+                   // outside going in
+                   stream.lineStart();
+                   point2 = intersect(point1, point0);
+                   stream.point(point2[0], point2[1]);
+                 } else {
+                   // inside going out
+                   point2 = intersect(point0, point1);
+                   stream.point(point2[0], point2[1], 2);
+                   stream.lineEnd();
+                 }
 
-       // Test active (dragged or drawing) segments against inactive segments
-       // This is used to test whether a way intersects with itself.
-       function geoHasSelfIntersections(nodes, activeID) {
-           var actives = [];
-           var inactives = [];
-           var j, k;
-
-           // group active and passive segments along the nodes
-           for (j = 0; j < nodes.length - 1; j++) {
-               var n1 = nodes[j];
-               var n2 = nodes[j+1];
-               var segment = [n1.loc, n2.loc];
-               if (n1.id === activeID || n2.id === activeID) {
-                   actives.push(segment);
-               } else {
-                   inactives.push(segment);
-               }
-           }
+                 point0 = point2;
+               } else if (notHemisphere && point0 && smallRadius ^ v) {
+                 var t; // If the codes for two points are different, or are both zero,
+                 // and there this segment intersects with the small circle.
 
-           // test
-           for (j = 0; j < actives.length; j++) {
-               for (k = 0; k < inactives.length; k++) {
-                   var p = actives[j];
-                   var q = inactives[k];
-                   // skip if segments share an endpoint
-                   if (geoVecEqual(p[1], q[0]) || geoVecEqual(p[0], q[1]) ||
-                       geoVecEqual(p[0], q[0]) || geoVecEqual(p[1], q[1]) ) {
-                       continue;
-                   }
+                 if (!(c & c0) && (t = intersect(point1, point0, true))) {
+                   _clean = 0;
 
-                   var hit = geoLineIntersection(p, q);
-                   if (hit) {
-                       var epsilon = 1e-8;
-                       // skip if the hit is at the segment's endpoint
-                       if (geoVecEqual(p[1], hit, epsilon) || geoVecEqual(p[0], hit, epsilon) ||
-                           geoVecEqual(q[1], hit, epsilon) || geoVecEqual(q[0], hit, epsilon) ) {
-                           continue;
-                       } else {
-                           return true;
-                       }
+                   if (smallRadius) {
+                     stream.lineStart();
+                     stream.point(t[0][0], t[0][1]);
+                     stream.point(t[1][0], t[1][1]);
+                     stream.lineEnd();
+                   } else {
+                     stream.point(t[1][0], t[1][1]);
+                     stream.lineEnd();
+                     stream.lineStart();
+                     stream.point(t[0][0], t[0][1], 3);
                    }
+                 }
                }
-           }
-
-           return false;
-       }
 
+               if (v && (!point0 || !pointEqual(point0, point1))) {
+                 stream.point(point1[0], point1[1]);
+               }
 
-       // Return the intersection point of 2 line segments.
-       // From https://github.com/pgkelley4/line-segments-intersect
-       // This uses the vector cross product approach described below:
-       //  http://stackoverflow.com/a/565282/786339
-       function geoLineIntersection(a, b) {
-           var p = [a[0][0], a[0][1]];
-           var p2 = [a[1][0], a[1][1]];
-           var q = [b[0][0], b[0][1]];
-           var q2 = [b[1][0], b[1][1]];
-           var r = geoVecSubtract(p2, p);
-           var s = geoVecSubtract(q2, q);
-           var uNumerator = geoVecCross(geoVecSubtract(q, p), r);
-           var denominator = geoVecCross(r, s);
+               point0 = point1, v0 = v, c0 = c;
+             },
+             lineEnd: function lineEnd() {
+               if (v0) stream.lineEnd();
+               point0 = null;
+             },
+             // Rejoin first and last segments if there were intersections and the first
+             // and last points were visible.
+             clean: function clean() {
+               return _clean | (v00 && v0) << 1;
+             }
+           };
+         } // Intersects the great circle between a and b with the clip circle.
 
-           if (uNumerator && denominator) {
-               var u = uNumerator / denominator;
-               var t = geoVecCross(geoVecSubtract(q, p), s) / denominator;
 
-               if ((t >= 0) && (t <= 1) && (u >= 0) && (u <= 1)) {
-                   return geoVecInterp(p, p2, t);
-               }
-           }
+         function intersect(a, b, two) {
+           var pa = cartesian(a),
+               pb = cartesian(b); // We have two planes, n1.p = d1 and n2.p = d2.
+           // Find intersection line p(t) = c1 n1 + c2 n2 + t (n1 ⨯ n2).
 
-           return null;
-       }
+           var n1 = [1, 0, 0],
+               // normal
+           n2 = cartesianCross(pa, pb),
+               n2n2 = cartesianDot(n2, n2),
+               n1n2 = n2[0],
+               // cartesianDot(n1, n2),
+           determinant = n2n2 - n1n2 * n1n2; // Two polar points.
 
+           if (!determinant) return !two && a;
+           var c1 = cr * n2n2 / determinant,
+               c2 = -cr * n1n2 / determinant,
+               n1xn2 = cartesianCross(n1, n2),
+               A = cartesianScale(n1, c1),
+               B = cartesianScale(n2, c2);
+           cartesianAddInPlace(A, B); // Solve |p(t)|^2 = 1.
 
-       function geoPathIntersections(path1, path2) {
-           var intersections = [];
-           for (var i = 0; i < path1.length - 1; i++) {
-               for (var j = 0; j < path2.length - 1; j++) {
-                   var a = [ path1[i], path1[i+1] ];
-                   var b = [ path2[j], path2[j+1] ];
-                   var hit = geoLineIntersection(a, b);
-                   if (hit) {
-                       intersections.push(hit);
-                   }
-               }
-           }
-           return intersections;
-       }
+           var u = n1xn2,
+               w = cartesianDot(A, u),
+               uu = cartesianDot(u, u),
+               t2 = w * w - uu * (cartesianDot(A, A) - 1);
+           if (t2 < 0) return;
+           var t = sqrt$1(t2),
+               q = cartesianScale(u, (-w - t) / uu);
+           cartesianAddInPlace(q, A);
+           q = spherical(q);
+           if (!two) return q; // Two intersection points.
 
-       function geoPathHasIntersections(path1, path2) {
-           for (var i = 0; i < path1.length - 1; i++) {
-               for (var j = 0; j < path2.length - 1; j++) {
-                   var a = [ path1[i], path1[i+1] ];
-                   var b = [ path2[j], path2[j+1] ];
-                   var hit = geoLineIntersection(a, b);
-                   if (hit) {
-                       return true;
-                   }
-               }
+           var lambda0 = a[0],
+               lambda1 = b[0],
+               phi0 = a[1],
+               phi1 = b[1],
+               z;
+           if (lambda1 < lambda0) z = lambda0, lambda0 = lambda1, lambda1 = z;
+           var delta = lambda1 - lambda0,
+               polar = abs$2(delta - pi) < epsilon,
+               meridian = polar || delta < epsilon;
+           if (!polar && phi1 < phi0) z = phi0, phi0 = phi1, phi1 = z; // Check that the first point is between a and b.
+
+           if (meridian ? polar ? phi0 + phi1 > 0 ^ q[1] < (abs$2(q[0] - lambda0) < epsilon ? phi0 : phi1) : phi0 <= q[1] && q[1] <= phi1 : delta > pi ^ (lambda0 <= q[0] && q[0] <= lambda1)) {
+             var q1 = cartesianScale(u, (-w + t) / uu);
+             cartesianAddInPlace(q1, A);
+             return [q, spherical(q1)];
            }
-           return false;
-       }
+         } // Generates a 4-bit vector representing the location of a point relative to
+         // the small circle's bounding box.
 
 
-       // Return whether point is contained in polygon.
-       //
-       // `point` should be a 2-item array of coordinates.
-       // `polygon` should be an array of 2-item arrays of coordinates.
-       //
-       // From https://github.com/substack/point-in-polygon.
-       // ray-casting algorithm based on
-       // http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html
-       //
-       function geoPointInPolygon(point, polygon) {
-           var x = point[0];
-           var y = point[1];
-           var inside = false;
+         function code(lambda, phi) {
+           var r = smallRadius ? radius : pi - radius,
+               code = 0;
+           if (lambda < -r) code |= 1; // left
+           else if (lambda > r) code |= 2; // right
 
-           for (var i = 0, j = polygon.length - 1; i < polygon.length; j = i++) {
-               var xi = polygon[i][0];
-               var yi = polygon[i][1];
-               var xj = polygon[j][0];
-               var yj = polygon[j][1];
+           if (phi < -r) code |= 4; // below
+           else if (phi > r) code |= 8; // above
 
-               var intersect = ((yi > y) !== (yj > y)) &&
-                   (x < (xj - xi) * (y - yi) / (yj - yi) + xi);
-               if (intersect) inside = !inside;
-           }
+           return code;
+         }
 
-           return inside;
+         return clip(visible, clipLine, interpolate, smallRadius ? [0, -radius] : [-pi, radius - pi]);
        }
 
+       function clipLine (a, b, x0, y0, x1, y1) {
+         var ax = a[0],
+             ay = a[1],
+             bx = b[0],
+             by = b[1],
+             t0 = 0,
+             t1 = 1,
+             dx = bx - ax,
+             dy = by - ay,
+             r;
+         r = x0 - ax;
+         if (!dx && r > 0) return;
+         r /= dx;
 
-       function geoPolygonContainsPolygon(outer, inner) {
-           return inner.every(function(point) {
-               return geoPointInPolygon(point, outer);
-           });
-       }
+         if (dx < 0) {
+           if (r < t0) return;
+           if (r < t1) t1 = r;
+         } else if (dx > 0) {
+           if (r > t1) return;
+           if (r > t0) t0 = r;
+         }
 
+         r = x1 - ax;
+         if (!dx && r < 0) return;
+         r /= dx;
 
-       function geoPolygonIntersectsPolygon(outer, inner, checkSegments) {
-           function testPoints(outer, inner) {
-               return inner.some(function(point) {
-                   return geoPointInPolygon(point, outer);
-               });
-           }
+         if (dx < 0) {
+           if (r > t1) return;
+           if (r > t0) t0 = r;
+         } else if (dx > 0) {
+           if (r < t0) return;
+           if (r < t1) t1 = r;
+         }
 
-          return testPoints(outer, inner) || (!!checkSegments && geoPathHasIntersections(outer, inner));
-       }
+         r = y0 - ay;
+         if (!dy && r > 0) return;
+         r /= dy;
 
+         if (dy < 0) {
+           if (r < t0) return;
+           if (r < t1) t1 = r;
+         } else if (dy > 0) {
+           if (r > t1) return;
+           if (r > t0) t0 = r;
+         }
 
-       // http://gis.stackexchange.com/questions/22895/finding-minimum-area-rectangle-for-given-points
-       // http://gis.stackexchange.com/questions/3739/generalisation-strategies-for-building-outlines/3756#3756
-       function geoGetSmallestSurroundingRectangle(points) {
-           var hull = d3_polygonHull(points);
-           var centroid = d3_polygonCentroid(hull);
-           var minArea = Infinity;
-           var ssrExtent = [];
-           var ssrAngle = 0;
-           var c1 = hull[0];
-
-           for (var i = 0; i <= hull.length - 1; i++) {
-               var c2 = (i === hull.length - 1) ? hull[0] : hull[i + 1];
-               var angle = Math.atan2(c2[1] - c1[1], c2[0] - c1[0]);
-               var poly = geoRotate(hull, -angle, centroid);
-               var extent = poly.reduce(function(extent, point) {
-                   return extent.extend(geoExtent(point));
-               }, geoExtent());
-
-               var area = extent.area();
-               if (area < minArea) {
-                   minArea = area;
-                   ssrExtent = extent;
-                   ssrAngle = angle;
-               }
-               c1 = c2;
-           }
+         r = y1 - ay;
+         if (!dy && r < 0) return;
+         r /= dy;
 
-           return {
-               poly: geoRotate(ssrExtent.polygon(), ssrAngle, centroid),
-               angle: ssrAngle
-           };
+         if (dy < 0) {
+           if (r > t1) return;
+           if (r > t0) t0 = r;
+         } else if (dy > 0) {
+           if (r < t0) return;
+           if (r < t1) t1 = r;
+         }
+
+         if (t0 > 0) a[0] = ax + t0 * dx, a[1] = ay + t0 * dy;
+         if (t1 < 1) b[0] = ax + t1 * dx, b[1] = ay + t1 * dy;
+         return true;
        }
 
+       var clipMax = 1e9,
+           clipMin = -clipMax; // TODO Use d3-polygon’s polygonContains here for the ring check?
+       // TODO Eliminate duplicate buffering in clipBuffer and polygon.push?
 
-       function geoPathLength(path) {
-           var length = 0;
-           for (var i = 0; i < path.length - 1; i++) {
-               length += geoVecLength(path[i], path[i + 1]);
-           }
-           return length;
-       }
+       function clipRectangle(x0, y0, x1, y1) {
+         function visible(x, y) {
+           return x0 <= x && x <= x1 && y0 <= y && y <= y1;
+         }
 
+         function interpolate(from, to, direction, stream) {
+           var a = 0,
+               a1 = 0;
 
-       // If the given point is at the edge of the padded viewport,
-       // return a vector that will nudge the viewport in that direction
-       function geoViewportEdge(point, dimensions) {
-           var pad = [80, 20, 50, 20];   // top, right, bottom, left
-           var x = 0;
-           var y = 0;
-
-           if (point[0] > dimensions[0] - pad[1])
-               x = -10;
-           if (point[0] < pad[3])
-               x = 10;
-           if (point[1] > dimensions[1] - pad[2])
-               y = -10;
-           if (point[1] < pad[0])
-               y = 10;
-
-           if (x || y) {
-               return [x, y];
+           if (from == null || (a = corner(from, direction)) !== (a1 = corner(to, direction)) || comparePoint(from, to) < 0 ^ direction > 0) {
+             do {
+               stream.point(a === 0 || a === 3 ? x0 : x1, a > 1 ? y1 : y0);
+             } while ((a = (a + direction + 4) % 4) !== a1);
            } else {
-               return null;
+             stream.point(to[0], to[1]);
            }
-       }
+         }
 
-       var noop$3 = {value: function() {}};
+         function corner(p, direction) {
+           return abs$2(p[0] - x0) < epsilon ? direction > 0 ? 0 : 3 : abs$2(p[0] - x1) < epsilon ? direction > 0 ? 2 : 1 : abs$2(p[1] - y0) < epsilon ? direction > 0 ? 1 : 0 : direction > 0 ? 3 : 2; // abs(p[1] - y1) < epsilon
+         }
 
-       function dispatch() {
-         for (var i = 0, n = arguments.length, _ = {}, t; i < n; ++i) {
-           if (!(t = arguments[i] + "") || (t in _) || /[\s.]/.test(t)) throw new Error("illegal type: " + t);
-           _[t] = [];
+         function compareIntersection(a, b) {
+           return comparePoint(a.x, b.x);
          }
-         return new Dispatch(_);
-       }
 
-       function Dispatch(_) {
-         this._ = _;
-       }
+         function comparePoint(a, b) {
+           var ca = corner(a, 1),
+               cb = corner(b, 1);
+           return ca !== cb ? ca - cb : ca === 0 ? b[1] - a[1] : ca === 1 ? a[0] - b[0] : ca === 2 ? a[1] - b[1] : b[0] - a[0];
+         }
 
-       function parseTypenames(typenames, types) {
-         return typenames.trim().split(/^|\s+/).map(function(t) {
-           var name = "", i = t.indexOf(".");
-           if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);
-           if (t && !types.hasOwnProperty(t)) throw new Error("unknown type: " + t);
-           return {type: t, name: name};
-         });
-       }
+         return function (stream) {
+           var activeStream = stream,
+               bufferStream = clipBuffer(),
+               segments,
+               polygon,
+               ring,
+               x__,
+               y__,
+               v__,
+               // first point
+           x_,
+               y_,
+               v_,
+               // previous point
+           first,
+               clean;
+           var clipStream = {
+             point: point,
+             lineStart: lineStart,
+             lineEnd: lineEnd,
+             polygonStart: polygonStart,
+             polygonEnd: polygonEnd
+           };
 
-       Dispatch.prototype = dispatch.prototype = {
-         constructor: Dispatch,
-         on: function(typename, callback) {
-           var _ = this._,
-               T = parseTypenames(typename + "", _),
-               t,
-               i = -1,
-               n = T.length;
+           function point(x, y) {
+             if (visible(x, y)) activeStream.point(x, y);
+           }
 
-           // If no callback was specified, return the callback of the given type and name.
-           if (arguments.length < 2) {
-             while (++i < n) if ((t = (typename = T[i]).type) && (t = get$1(_[t], typename.name))) return t;
-             return;
+           function polygonInside() {
+             var winding = 0;
+
+             for (var i = 0, n = polygon.length; i < n; ++i) {
+               for (var ring = polygon[i], j = 1, m = ring.length, point = ring[0], a0, a1, b0 = point[0], b1 = point[1]; j < m; ++j) {
+                 a0 = b0, a1 = b1, point = ring[j], b0 = point[0], b1 = point[1];
+
+                 if (a1 <= y1) {
+                   if (b1 > y1 && (b0 - a0) * (y1 - a1) > (b1 - a1) * (x0 - a0)) ++winding;
+                 } else {
+                   if (b1 <= y1 && (b0 - a0) * (y1 - a1) < (b1 - a1) * (x0 - a0)) --winding;
+                 }
+               }
+             }
+
+             return winding;
+           } // Buffer geometry within a polygon and then clip it en masse.
+
+
+           function polygonStart() {
+             activeStream = bufferStream, segments = [], polygon = [], clean = true;
            }
 
-           // If a type was specified, set the callback for the given type and name.
-           // Otherwise, if a null callback was specified, remove callbacks of the given name.
-           if (callback != null && typeof callback !== "function") throw new Error("invalid callback: " + callback);
-           while (++i < n) {
-             if (t = (typename = T[i]).type) _[t] = set(_[t], typename.name, callback);
-             else if (callback == null) for (t in _) _[t] = set(_[t], typename.name, null);
+           function polygonEnd() {
+             var startInside = polygonInside(),
+                 cleanInside = clean && startInside,
+                 visible = (segments = merge(segments)).length;
+
+             if (cleanInside || visible) {
+               stream.polygonStart();
+
+               if (cleanInside) {
+                 stream.lineStart();
+                 interpolate(null, null, 1, stream);
+                 stream.lineEnd();
+               }
+
+               if (visible) {
+                 clipRejoin(segments, compareIntersection, startInside, interpolate, stream);
+               }
+
+               stream.polygonEnd();
+             }
+
+             activeStream = stream, segments = polygon = ring = null;
            }
 
-           return this;
-         },
-         copy: function() {
-           var copy = {}, _ = this._;
-           for (var t in _) copy[t] = _[t].slice();
-           return new Dispatch(copy);
-         },
-         call: function(type, that) {
-           if ((n = arguments.length - 2) > 0) for (var args = new Array(n), i = 0, n, t; i < n; ++i) args[i] = arguments[i + 2];
-           if (!this._.hasOwnProperty(type)) throw new Error("unknown type: " + type);
-           for (t = this._[type], i = 0, n = t.length; i < n; ++i) t[i].value.apply(that, args);
-         },
-         apply: function(type, that, args) {
-           if (!this._.hasOwnProperty(type)) throw new Error("unknown type: " + type);
-           for (var t = this._[type], i = 0, n = t.length; i < n; ++i) t[i].value.apply(that, args);
-         }
-       };
+           function lineStart() {
+             clipStream.point = linePoint;
+             if (polygon) polygon.push(ring = []);
+             first = true;
+             v_ = false;
+             x_ = y_ = NaN;
+           } // TODO rather than special-case polygons, simply handle them separately.
+           // Ideally, coincident intersection points should be jittered to avoid
+           // clipping issues.
 
-       function get$1(type, name) {
-         for (var i = 0, n = type.length, c; i < n; ++i) {
-           if ((c = type[i]).name === name) {
-             return c.value;
+
+           function lineEnd() {
+             if (segments) {
+               linePoint(x__, y__);
+               if (v__ && v_) bufferStream.rejoin();
+               segments.push(bufferStream.result());
+             }
+
+             clipStream.point = point;
+             if (v_) activeStream.lineEnd();
            }
-         }
-       }
 
-       function set(type, name, callback) {
-         for (var i = 0, n = type.length; i < n; ++i) {
-           if (type[i].name === name) {
-             type[i] = noop$3, type = type.slice(0, i).concat(type.slice(i + 1));
-             break;
+           function linePoint(x, y) {
+             var v = visible(x, y);
+             if (polygon) ring.push([x, y]);
+
+             if (first) {
+               x__ = x, y__ = y, v__ = v;
+               first = false;
+
+               if (v) {
+                 activeStream.lineStart();
+                 activeStream.point(x, y);
+               }
+             } else {
+               if (v && v_) activeStream.point(x, y);else {
+                 var a = [x_ = Math.max(clipMin, Math.min(clipMax, x_)), y_ = Math.max(clipMin, Math.min(clipMax, y_))],
+                     b = [x = Math.max(clipMin, Math.min(clipMax, x)), y = Math.max(clipMin, Math.min(clipMax, y))];
+
+                 if (clipLine(a, b, x0, y0, x1, y1)) {
+                   if (!v_) {
+                     activeStream.lineStart();
+                     activeStream.point(a[0], a[1]);
+                   }
+
+                   activeStream.point(b[0], b[1]);
+                   if (!v) activeStream.lineEnd();
+                   clean = false;
+                 } else if (v) {
+                   activeStream.lineStart();
+                   activeStream.point(x, y);
+                   clean = false;
+                 }
+               }
+             }
+
+             x_ = x, y_ = y, v_ = v;
            }
-         }
-         if (callback != null) type.push({name: name, value: callback});
-         return type;
-       }
 
-       var xhtml = "http://www.w3.org/1999/xhtml";
+           return clipStream;
+         };
+       }
 
-       var namespaces = {
-         svg: "http://www.w3.org/2000/svg",
-         xhtml: xhtml,
-         xlink: "http://www.w3.org/1999/xlink",
-         xml: "http://www.w3.org/XML/1998/namespace",
-         xmlns: "http://www.w3.org/2000/xmlns/"
+       var lengthSum, lambda0$2, sinPhi0$1, cosPhi0$1;
+       var lengthStream = {
+         sphere: noop,
+         point: noop,
+         lineStart: lengthLineStart,
+         lineEnd: noop,
+         polygonStart: noop,
+         polygonEnd: noop
        };
 
-       function namespace(name) {
-         var prefix = name += "", i = prefix.indexOf(":");
-         if (i >= 0 && (prefix = name.slice(0, i)) !== "xmlns") name = name.slice(i + 1);
-         return namespaces.hasOwnProperty(prefix) ? {space: namespaces[prefix], local: name} : name;
+       function lengthLineStart() {
+         lengthStream.point = lengthPointFirst;
+         lengthStream.lineEnd = lengthLineEnd;
        }
 
-       function creatorInherit(name) {
-         return function() {
-           var document = this.ownerDocument,
-               uri = this.namespaceURI;
-           return uri === xhtml && document.documentElement.namespaceURI === xhtml
-               ? document.createElement(name)
-               : document.createElementNS(uri, name);
-         };
+       function lengthLineEnd() {
+         lengthStream.point = lengthStream.lineEnd = noop;
        }
 
-       function creatorFixed(fullname) {
-         return function() {
-           return this.ownerDocument.createElementNS(fullname.space, fullname.local);
-         };
+       function lengthPointFirst(lambda, phi) {
+         lambda *= radians, phi *= radians;
+         lambda0$2 = lambda, sinPhi0$1 = sin(phi), cosPhi0$1 = cos(phi);
+         lengthStream.point = lengthPoint;
        }
 
-       function creator(name) {
-         var fullname = namespace(name);
-         return (fullname.local
-             ? creatorFixed
-             : creatorInherit)(fullname);
+       function lengthPoint(lambda, phi) {
+         lambda *= radians, phi *= radians;
+         var sinPhi = sin(phi),
+             cosPhi = cos(phi),
+             delta = abs$2(lambda - lambda0$2),
+             cosDelta = cos(delta),
+             sinDelta = sin(delta),
+             x = cosPhi * sinDelta,
+             y = cosPhi0$1 * sinPhi - sinPhi0$1 * cosPhi * cosDelta,
+             z = sinPhi0$1 * sinPhi + cosPhi0$1 * cosPhi * cosDelta;
+         lengthSum.add(atan2(sqrt$1(x * x + y * y), z));
+         lambda0$2 = lambda, sinPhi0$1 = sinPhi, cosPhi0$1 = cosPhi;
        }
 
-       function none() {}
-
-       function selector(selector) {
-         return selector == null ? none : function() {
-           return this.querySelector(selector);
-         };
+       function d3_geoLength (object) {
+         lengthSum = new Adder();
+         d3_geoStream(object, lengthStream);
+         return +lengthSum;
        }
 
-       function selection_select(select) {
-         if (typeof select !== "function") select = selector(select);
+       var identity = (function (x) {
+         return x;
+       });
 
-         for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
-           for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
-             if ((node = group[i]) && (subnode = select.call(node, node.__data__, i, group))) {
-               if ("__data__" in node) subnode.__data__ = node.__data__;
-               subgroup[i] = subnode;
-             }
-           }
+       var areaSum$1 = new Adder(),
+           areaRingSum$1 = new Adder(),
+           x00,
+           y00,
+           x0$1,
+           y0$1;
+       var areaStream$1 = {
+         point: noop,
+         lineStart: noop,
+         lineEnd: noop,
+         polygonStart: function polygonStart() {
+           areaStream$1.lineStart = areaRingStart$1;
+           areaStream$1.lineEnd = areaRingEnd$1;
+         },
+         polygonEnd: function polygonEnd() {
+           areaStream$1.lineStart = areaStream$1.lineEnd = areaStream$1.point = noop;
+           areaSum$1.add(abs$2(areaRingSum$1));
+           areaRingSum$1 = new Adder();
+         },
+         result: function result() {
+           var area = areaSum$1 / 2;
+           areaSum$1 = new Adder();
+           return area;
          }
+       };
 
-         return new Selection(subgroups, this._parents);
+       function areaRingStart$1() {
+         areaStream$1.point = areaPointFirst$1;
        }
 
-       function empty() {
-         return [];
+       function areaPointFirst$1(x, y) {
+         areaStream$1.point = areaPoint$1;
+         x00 = x0$1 = x, y00 = y0$1 = y;
        }
 
-       function selectorAll(selector) {
-         return selector == null ? empty : function() {
-           return this.querySelectorAll(selector);
-         };
+       function areaPoint$1(x, y) {
+         areaRingSum$1.add(y0$1 * x - x0$1 * y);
+         x0$1 = x, y0$1 = y;
        }
 
-       function selection_selectAll(select) {
-         if (typeof select !== "function") select = selectorAll(select);
+       function areaRingEnd$1() {
+         areaPoint$1(x00, y00);
+       }
 
-         for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {
-           for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
-             if (node = group[i]) {
-               subgroups.push(select.call(node, node.__data__, i, group));
-               parents.push(node);
-             }
-           }
+       var x0$2 = Infinity,
+           y0$2 = x0$2,
+           x1 = -x0$2,
+           y1 = x1;
+       var boundsStream$1 = {
+         point: boundsPoint$1,
+         lineStart: noop,
+         lineEnd: noop,
+         polygonStart: noop,
+         polygonEnd: noop,
+         result: function result() {
+           var bounds = [[x0$2, y0$2], [x1, y1]];
+           x1 = y1 = -(y0$2 = x0$2 = Infinity);
+           return bounds;
          }
+       };
 
-         return new Selection(subgroups, parents);
-       }
-
-       function matcher(selector) {
-         return function() {
-           return this.matches(selector);
-         };
+       function boundsPoint$1(x, y) {
+         if (x < x0$2) x0$2 = x;
+         if (x > x1) x1 = x;
+         if (y < y0$2) y0$2 = y;
+         if (y > y1) y1 = y;
        }
 
-       function selection_filter(match) {
-         if (typeof match !== "function") match = matcher(match);
-
-         for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
-           for (var group = groups[j], n = group.length, subgroup = subgroups[j] = [], node, i = 0; i < n; ++i) {
-             if ((node = group[i]) && match.call(node, node.__data__, i, group)) {
-               subgroup.push(node);
-             }
-           }
+       var X0$1 = 0,
+           Y0$1 = 0,
+           Z0$1 = 0,
+           X1$1 = 0,
+           Y1$1 = 0,
+           Z1$1 = 0,
+           X2$1 = 0,
+           Y2$1 = 0,
+           Z2$1 = 0,
+           x00$1,
+           y00$1,
+           x0$3,
+           y0$3;
+       var centroidStream$1 = {
+         point: centroidPoint$1,
+         lineStart: centroidLineStart$1,
+         lineEnd: centroidLineEnd$1,
+         polygonStart: function polygonStart() {
+           centroidStream$1.lineStart = centroidRingStart$1;
+           centroidStream$1.lineEnd = centroidRingEnd$1;
+         },
+         polygonEnd: function polygonEnd() {
+           centroidStream$1.point = centroidPoint$1;
+           centroidStream$1.lineStart = centroidLineStart$1;
+           centroidStream$1.lineEnd = centroidLineEnd$1;
+         },
+         result: function result() {
+           var centroid = Z2$1 ? [X2$1 / Z2$1, Y2$1 / Z2$1] : Z1$1 ? [X1$1 / Z1$1, Y1$1 / Z1$1] : Z0$1 ? [X0$1 / Z0$1, Y0$1 / Z0$1] : [NaN, NaN];
+           X0$1 = Y0$1 = Z0$1 = X1$1 = Y1$1 = Z1$1 = X2$1 = Y2$1 = Z2$1 = 0;
+           return centroid;
          }
+       };
 
-         return new Selection(subgroups, this._parents);
+       function centroidPoint$1(x, y) {
+         X0$1 += x;
+         Y0$1 += y;
+         ++Z0$1;
        }
 
-       function sparse(update) {
-         return new Array(update.length);
+       function centroidLineStart$1() {
+         centroidStream$1.point = centroidPointFirstLine;
        }
 
-       function selection_enter() {
-         return new Selection(this._enter || this._groups.map(sparse), this._parents);
+       function centroidPointFirstLine(x, y) {
+         centroidStream$1.point = centroidPointLine;
+         centroidPoint$1(x0$3 = x, y0$3 = y);
        }
 
-       function EnterNode(parent, datum) {
-         this.ownerDocument = parent.ownerDocument;
-         this.namespaceURI = parent.namespaceURI;
-         this._next = null;
-         this._parent = parent;
-         this.__data__ = datum;
+       function centroidPointLine(x, y) {
+         var dx = x - x0$3,
+             dy = y - y0$3,
+             z = sqrt$1(dx * dx + dy * dy);
+         X1$1 += z * (x0$3 + x) / 2;
+         Y1$1 += z * (y0$3 + y) / 2;
+         Z1$1 += z;
+         centroidPoint$1(x0$3 = x, y0$3 = y);
        }
 
-       EnterNode.prototype = {
-         constructor: EnterNode,
-         appendChild: function(child) { return this._parent.insertBefore(child, this._next); },
-         insertBefore: function(child, next) { return this._parent.insertBefore(child, next); },
-         querySelector: function(selector) { return this._parent.querySelector(selector); },
-         querySelectorAll: function(selector) { return this._parent.querySelectorAll(selector); }
-       };
+       function centroidLineEnd$1() {
+         centroidStream$1.point = centroidPoint$1;
+       }
 
-       function constant(x) {
-         return function() {
-           return x;
-         };
+       function centroidRingStart$1() {
+         centroidStream$1.point = centroidPointFirstRing;
        }
 
-       var keyPrefix = "$"; // Protect against keys like “__proto__”.
+       function centroidRingEnd$1() {
+         centroidPointRing(x00$1, y00$1);
+       }
 
-       function bindIndex(parent, group, enter, update, exit, data) {
-         var i = 0,
-             node,
-             groupLength = group.length,
-             dataLength = data.length;
+       function centroidPointFirstRing(x, y) {
+         centroidStream$1.point = centroidPointRing;
+         centroidPoint$1(x00$1 = x0$3 = x, y00$1 = y0$3 = y);
+       }
 
-         // Put any non-null nodes that fit into update.
-         // Put any null nodes into enter.
-         // Put any remaining data into enter.
-         for (; i < dataLength; ++i) {
-           if (node = group[i]) {
-             node.__data__ = data[i];
-             update[i] = node;
-           } else {
-             enter[i] = new EnterNode(parent, data[i]);
-           }
-         }
-
-         // Put any non-null nodes that don’t fit into exit.
-         for (; i < groupLength; ++i) {
-           if (node = group[i]) {
-             exit[i] = node;
-           }
-         }
+       function centroidPointRing(x, y) {
+         var dx = x - x0$3,
+             dy = y - y0$3,
+             z = sqrt$1(dx * dx + dy * dy);
+         X1$1 += z * (x0$3 + x) / 2;
+         Y1$1 += z * (y0$3 + y) / 2;
+         Z1$1 += z;
+         z = y0$3 * x - x0$3 * y;
+         X2$1 += z * (x0$3 + x);
+         Y2$1 += z * (y0$3 + y);
+         Z2$1 += z * 3;
+         centroidPoint$1(x0$3 = x, y0$3 = y);
        }
 
-       function bindKey(parent, group, enter, update, exit, data, key) {
-         var i,
-             node,
-             nodeByKeyValue = {},
-             groupLength = group.length,
-             dataLength = data.length,
-             keyValues = new Array(groupLength),
-             keyValue;
-
-         // Compute the key for each node.
-         // If multiple nodes have the same key, the duplicates are added to exit.
-         for (i = 0; i < groupLength; ++i) {
-           if (node = group[i]) {
-             keyValues[i] = keyValue = keyPrefix + key.call(node, node.__data__, i, group);
-             if (keyValue in nodeByKeyValue) {
-               exit[i] = node;
-             } else {
-               nodeByKeyValue[keyValue] = node;
-             }
-           }
-         }
-
-         // Compute the key for each datum.
-         // If there a node associated with this key, join and add it to update.
-         // If there is not (or the key is a duplicate), add it to enter.
-         for (i = 0; i < dataLength; ++i) {
-           keyValue = keyPrefix + key.call(parent, data[i], i, data);
-           if (node = nodeByKeyValue[keyValue]) {
-             update[i] = node;
-             node.__data__ = data[i];
-             nodeByKeyValue[keyValue] = null;
-           } else {
-             enter[i] = new EnterNode(parent, data[i]);
-           }
-         }
-
-         // Add any remaining nodes that were not bound to data to exit.
-         for (i = 0; i < groupLength; ++i) {
-           if ((node = group[i]) && (nodeByKeyValue[keyValues[i]] === node)) {
-             exit[i] = node;
-           }
-         }
+       function PathContext(context) {
+         this._context = context;
        }
+       PathContext.prototype = {
+         _radius: 4.5,
+         pointRadius: function pointRadius(_) {
+           return this._radius = _, this;
+         },
+         polygonStart: function polygonStart() {
+           this._line = 0;
+         },
+         polygonEnd: function polygonEnd() {
+           this._line = NaN;
+         },
+         lineStart: function lineStart() {
+           this._point = 0;
+         },
+         lineEnd: function lineEnd() {
+           if (this._line === 0) this._context.closePath();
+           this._point = NaN;
+         },
+         point: function point(x, y) {
+           switch (this._point) {
+             case 0:
+               {
+                 this._context.moveTo(x, y);
 
-       function selection_data(value, key) {
-         if (!value) {
-           data = new Array(this.size()), j = -1;
-           this.each(function(d) { data[++j] = d; });
-           return data;
-         }
+                 this._point = 1;
+                 break;
+               }
 
-         var bind = key ? bindKey : bindIndex,
-             parents = this._parents,
-             groups = this._groups;
+             case 1:
+               {
+                 this._context.lineTo(x, y);
 
-         if (typeof value !== "function") value = constant(value);
+                 break;
+               }
 
-         for (var m = groups.length, update = new Array(m), enter = new Array(m), exit = new Array(m), j = 0; j < m; ++j) {
-           var parent = parents[j],
-               group = groups[j],
-               groupLength = group.length,
-               data = value.call(parent, parent && parent.__data__, j, parents),
-               dataLength = data.length,
-               enterGroup = enter[j] = new Array(dataLength),
-               updateGroup = update[j] = new Array(dataLength),
-               exitGroup = exit[j] = new Array(groupLength);
+             default:
+               {
+                 this._context.moveTo(x + this._radius, y);
 
-           bind(parent, group, enterGroup, updateGroup, exitGroup, data, key);
+                 this._context.arc(x, y, this._radius, 0, tau);
 
-           // Now connect the enter nodes to their following update node, such that
-           // appendChild can insert the materialized enter node before this node,
-           // rather than at the end of the parent node.
-           for (var i0 = 0, i1 = 0, previous, next; i0 < dataLength; ++i0) {
-             if (previous = enterGroup[i0]) {
-               if (i0 >= i1) i1 = i0 + 1;
-               while (!(next = updateGroup[i1]) && ++i1 < dataLength);
-               previous._next = next || null;
-             }
+                 break;
+               }
            }
+         },
+         result: noop
+       };
+
+       var lengthSum$1 = new Adder(),
+           lengthRing,
+           x00$2,
+           y00$2,
+           x0$4,
+           y0$4;
+       var lengthStream$1 = {
+         point: noop,
+         lineStart: function lineStart() {
+           lengthStream$1.point = lengthPointFirst$1;
+         },
+         lineEnd: function lineEnd() {
+           if (lengthRing) lengthPoint$1(x00$2, y00$2);
+           lengthStream$1.point = noop;
+         },
+         polygonStart: function polygonStart() {
+           lengthRing = true;
+         },
+         polygonEnd: function polygonEnd() {
+           lengthRing = null;
+         },
+         result: function result() {
+           var length = +lengthSum$1;
+           lengthSum$1 = new Adder();
+           return length;
          }
+       };
 
-         update = new Selection(update, parents);
-         update._enter = enter;
-         update._exit = exit;
-         return update;
+       function lengthPointFirst$1(x, y) {
+         lengthStream$1.point = lengthPoint$1;
+         x00$2 = x0$4 = x, y00$2 = y0$4 = y;
        }
 
-       function selection_exit() {
-         return new Selection(this._exit || this._groups.map(sparse), this._parents);
+       function lengthPoint$1(x, y) {
+         x0$4 -= x, y0$4 -= y;
+         lengthSum$1.add(sqrt$1(x0$4 * x0$4 + y0$4 * y0$4));
+         x0$4 = x, y0$4 = y;
        }
 
-       function selection_join(onenter, onupdate, onexit) {
-         var enter = this.enter(), update = this, exit = this.exit();
-         enter = typeof onenter === "function" ? onenter(enter) : enter.append(onenter + "");
-         if (onupdate != null) update = onupdate(update);
-         if (onexit == null) exit.remove(); else onexit(exit);
-         return enter && update ? enter.merge(update).order() : update;
+       function PathString() {
+         this._string = [];
        }
+       PathString.prototype = {
+         _radius: 4.5,
+         _circle: circle(4.5),
+         pointRadius: function pointRadius(_) {
+           if ((_ = +_) !== this._radius) this._radius = _, this._circle = null;
+           return this;
+         },
+         polygonStart: function polygonStart() {
+           this._line = 0;
+         },
+         polygonEnd: function polygonEnd() {
+           this._line = NaN;
+         },
+         lineStart: function lineStart() {
+           this._point = 0;
+         },
+         lineEnd: function lineEnd() {
+           if (this._line === 0) this._string.push("Z");
+           this._point = NaN;
+         },
+         point: function point(x, y) {
+           switch (this._point) {
+             case 0:
+               {
+                 this._string.push("M", x, ",", y);
 
-       function selection_merge(selection) {
+                 this._point = 1;
+                 break;
+               }
 
-         for (var groups0 = this._groups, groups1 = selection._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
-           for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
-             if (node = group0[i] || group1[i]) {
-               merge[i] = node;
-             }
-           }
-         }
+             case 1:
+               {
+                 this._string.push("L", x, ",", y);
 
-         for (; j < m0; ++j) {
-           merges[j] = groups0[j];
-         }
+                 break;
+               }
 
-         return new Selection(merges, this._parents);
-       }
+             default:
+               {
+                 if (this._circle == null) this._circle = circle(this._radius);
 
-       function selection_order() {
+                 this._string.push("M", x, ",", y, this._circle);
 
-         for (var groups = this._groups, j = -1, m = groups.length; ++j < m;) {
-           for (var group = groups[j], i = group.length - 1, next = group[i], node; --i >= 0;) {
-             if (node = group[i]) {
-               if (next && node.compareDocumentPosition(next) ^ 4) next.parentNode.insertBefore(node, next);
-               next = node;
-             }
+                 break;
+               }
            }
-         }
-
-         return this;
-       }
-
-       function selection_sort(compare) {
-         if (!compare) compare = ascending;
-
-         function compareNode(a, b) {
-           return a && b ? compare(a.__data__, b.__data__) : !a - !b;
-         }
+         },
+         result: function result() {
+           if (this._string.length) {
+             var result = this._string.join("");
 
-         for (var groups = this._groups, m = groups.length, sortgroups = new Array(m), j = 0; j < m; ++j) {
-           for (var group = groups[j], n = group.length, sortgroup = sortgroups[j] = new Array(n), node, i = 0; i < n; ++i) {
-             if (node = group[i]) {
-               sortgroup[i] = node;
-             }
+             this._string = [];
+             return result;
+           } else {
+             return null;
            }
-           sortgroup.sort(compareNode);
          }
+       };
 
-         return new Selection(sortgroups, this._parents).order();
-       }
-
-       function ascending(a, b) {
-         return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
-       }
-
-       function selection_call() {
-         var callback = arguments[0];
-         arguments[0] = this;
-         callback.apply(null, arguments);
-         return this;
-       }
-
-       function selection_nodes() {
-         var nodes = new Array(this.size()), i = -1;
-         this.each(function() { nodes[++i] = this; });
-         return nodes;
+       function circle(radius) {
+         return "m0," + radius + "a" + radius + "," + radius + " 0 1,1 0," + -2 * radius + "a" + radius + "," + radius + " 0 1,1 0," + 2 * radius + "z";
        }
 
-       function selection_node() {
+       function d3_geoPath (projection, context) {
+         var pointRadius = 4.5,
+             projectionStream,
+             contextStream;
 
-         for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {
-           for (var group = groups[j], i = 0, n = group.length; i < n; ++i) {
-             var node = group[i];
-             if (node) return node;
+         function path(object) {
+           if (object) {
+             if (typeof pointRadius === "function") contextStream.pointRadius(+pointRadius.apply(this, arguments));
+             d3_geoStream(object, projectionStream(contextStream));
            }
-         }
-
-         return null;
-       }
-
-       function selection_size() {
-         var size = 0;
-         this.each(function() { ++size; });
-         return size;
-       }
 
-       function selection_empty() {
-         return !this.node();
-       }
+           return contextStream.result();
+         }
 
-       function selection_each(callback) {
+         path.area = function (object) {
+           d3_geoStream(object, projectionStream(areaStream$1));
+           return areaStream$1.result();
+         };
 
-         for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {
-           for (var group = groups[j], i = 0, n = group.length, node; i < n; ++i) {
-             if (node = group[i]) callback.call(node, node.__data__, i, group);
-           }
-         }
+         path.measure = function (object) {
+           d3_geoStream(object, projectionStream(lengthStream$1));
+           return lengthStream$1.result();
+         };
 
-         return this;
-       }
+         path.bounds = function (object) {
+           d3_geoStream(object, projectionStream(boundsStream$1));
+           return boundsStream$1.result();
+         };
 
-       function attrRemove(name) {
-         return function() {
-           this.removeAttribute(name);
+         path.centroid = function (object) {
+           d3_geoStream(object, projectionStream(centroidStream$1));
+           return centroidStream$1.result();
          };
-       }
 
-       function attrRemoveNS(fullname) {
-         return function() {
-           this.removeAttributeNS(fullname.space, fullname.local);
+         path.projection = function (_) {
+           return arguments.length ? (projectionStream = _ == null ? (projection = null, identity) : (projection = _).stream, path) : projection;
          };
-       }
 
-       function attrConstant(name, value) {
-         return function() {
-           this.setAttribute(name, value);
+         path.context = function (_) {
+           if (!arguments.length) return context;
+           contextStream = _ == null ? (context = null, new PathString()) : new PathContext(context = _);
+           if (typeof pointRadius !== "function") contextStream.pointRadius(pointRadius);
+           return path;
          };
-       }
 
-       function attrConstantNS(fullname, value) {
-         return function() {
-           this.setAttributeNS(fullname.space, fullname.local, value);
+         path.pointRadius = function (_) {
+           if (!arguments.length) return pointRadius;
+           pointRadius = typeof _ === "function" ? _ : (contextStream.pointRadius(+_), +_);
+           return path;
          };
+
+         return path.projection(projection).context(context);
        }
 
-       function attrFunction(name, value) {
-         return function() {
-           var v = value.apply(this, arguments);
-           if (v == null) this.removeAttribute(name);
-           else this.setAttribute(name, v);
+       function d3_geoTransform (methods) {
+         return {
+           stream: transformer(methods)
          };
        }
+       function transformer(methods) {
+         return function (stream) {
+           var s = new TransformStream();
 
-       function attrFunctionNS(fullname, value) {
-         return function() {
-           var v = value.apply(this, arguments);
-           if (v == null) this.removeAttributeNS(fullname.space, fullname.local);
-           else this.setAttributeNS(fullname.space, fullname.local, v);
+           for (var key in methods) {
+             s[key] = methods[key];
+           }
+
+           s.stream = stream;
+           return s;
          };
        }
 
-       function selection_attr(name, value) {
-         var fullname = namespace(name);
+       function TransformStream() {}
 
-         if (arguments.length < 2) {
-           var node = this.node();
-           return fullname.local
-               ? node.getAttributeNS(fullname.space, fullname.local)
-               : node.getAttribute(fullname);
+       TransformStream.prototype = {
+         constructor: TransformStream,
+         point: function point(x, y) {
+           this.stream.point(x, y);
+         },
+         sphere: function sphere() {
+           this.stream.sphere();
+         },
+         lineStart: function lineStart() {
+           this.stream.lineStart();
+         },
+         lineEnd: function lineEnd() {
+           this.stream.lineEnd();
+         },
+         polygonStart: function polygonStart() {
+           this.stream.polygonStart();
+         },
+         polygonEnd: function polygonEnd() {
+           this.stream.polygonEnd();
          }
+       };
 
-         return this.each((value == null
-             ? (fullname.local ? attrRemoveNS : attrRemove) : (typeof value === "function"
-             ? (fullname.local ? attrFunctionNS : attrFunction)
-             : (fullname.local ? attrConstantNS : attrConstant)))(fullname, value));
+       function fit(projection, fitBounds, object) {
+         var clip = projection.clipExtent && projection.clipExtent();
+         projection.scale(150).translate([0, 0]);
+         if (clip != null) projection.clipExtent(null);
+         d3_geoStream(object, projection.stream(boundsStream$1));
+         fitBounds(boundsStream$1.result());
+         if (clip != null) projection.clipExtent(clip);
+         return projection;
        }
 
-       function defaultView(node) {
-         return (node.ownerDocument && node.ownerDocument.defaultView) // node is a Node
-             || (node.document && node) // node is a Window
-             || node.defaultView; // node is a Document
+       function fitExtent(projection, extent, object) {
+         return fit(projection, function (b) {
+           var w = extent[1][0] - extent[0][0],
+               h = extent[1][1] - extent[0][1],
+               k = Math.min(w / (b[1][0] - b[0][0]), h / (b[1][1] - b[0][1])),
+               x = +extent[0][0] + (w - k * (b[1][0] + b[0][0])) / 2,
+               y = +extent[0][1] + (h - k * (b[1][1] + b[0][1])) / 2;
+           projection.scale(150 * k).translate([x, y]);
+         }, object);
        }
-
-       function styleRemove(name) {
-         return function() {
-           this.style.removeProperty(name);
-         };
+       function fitSize(projection, size, object) {
+         return fitExtent(projection, [[0, 0], size], object);
        }
-
-       function styleConstant(name, value, priority) {
-         return function() {
-           this.style.setProperty(name, value, priority);
-         };
+       function fitWidth(projection, width, object) {
+         return fit(projection, function (b) {
+           var w = +width,
+               k = w / (b[1][0] - b[0][0]),
+               x = (w - k * (b[1][0] + b[0][0])) / 2,
+               y = -k * b[0][1];
+           projection.scale(150 * k).translate([x, y]);
+         }, object);
        }
-
-       function styleFunction(name, value, priority) {
-         return function() {
-           var v = value.apply(this, arguments);
-           if (v == null) this.style.removeProperty(name);
-           else this.style.setProperty(name, v, priority);
-         };
+       function fitHeight(projection, height, object) {
+         return fit(projection, function (b) {
+           var h = +height,
+               k = h / (b[1][1] - b[0][1]),
+               x = -k * b[0][0],
+               y = (h - k * (b[1][1] + b[0][1])) / 2;
+           projection.scale(150 * k).translate([x, y]);
+         }, object);
        }
 
-       function selection_style(name, value, priority) {
-         return arguments.length > 1
-             ? this.each((value == null
-                   ? styleRemove : typeof value === "function"
-                   ? styleFunction
-                   : styleConstant)(name, value, priority == null ? "" : priority))
-             : styleValue(this.node(), name);
-       }
+       var maxDepth = 16,
+           // maximum depth of subdivision
+       cosMinDistance = cos(30 * radians); // cos(minimum angular distance)
 
-       function styleValue(node, name) {
-         return node.style.getPropertyValue(name)
-             || defaultView(node).getComputedStyle(node, null).getPropertyValue(name);
+       function resample (project, delta2) {
+         return +delta2 ? resample$1(project, delta2) : resampleNone(project);
        }
 
-       function propertyRemove(name) {
-         return function() {
-           delete this[name];
-         };
+       function resampleNone(project) {
+         return transformer({
+           point: function point(x, y) {
+             x = project(x, y);
+             this.stream.point(x[0], x[1]);
+           }
+         });
        }
 
-       function propertyConstant(name, value) {
-         return function() {
-           this[name] = value;
-         };
-       }
+       function resample$1(project, delta2) {
+         function resampleLineTo(x0, y0, lambda0, a0, b0, c0, x1, y1, lambda1, a1, b1, c1, depth, stream) {
+           var dx = x1 - x0,
+               dy = y1 - y0,
+               d2 = dx * dx + dy * dy;
 
-       function propertyFunction(name, value) {
-         return function() {
-           var v = value.apply(this, arguments);
-           if (v == null) delete this[name];
-           else this[name] = v;
-         };
-       }
+           if (d2 > 4 * delta2 && depth--) {
+             var a = a0 + a1,
+                 b = b0 + b1,
+                 c = c0 + c1,
+                 m = sqrt$1(a * a + b * b + c * c),
+                 phi2 = asin(c /= m),
+                 lambda2 = abs$2(abs$2(c) - 1) < epsilon || abs$2(lambda0 - lambda1) < epsilon ? (lambda0 + lambda1) / 2 : atan2(b, a),
+                 p = project(lambda2, phi2),
+                 x2 = p[0],
+                 y2 = p[1],
+                 dx2 = x2 - x0,
+                 dy2 = y2 - y0,
+                 dz = dy * dx2 - dx * dy2;
 
-       function selection_property(name, value) {
-         return arguments.length > 1
-             ? this.each((value == null
-                 ? propertyRemove : typeof value === "function"
-                 ? propertyFunction
-                 : propertyConstant)(name, value))
-             : this.node()[name];
-       }
+             if (dz * dz / d2 > delta2 // perpendicular projected distance
+             || abs$2((dx * dx2 + dy * dy2) / d2 - 0.5) > 0.3 // midpoint close to an end
+             || a0 * a1 + b0 * b1 + c0 * c1 < cosMinDistance) {
+               // angular distance
+               resampleLineTo(x0, y0, lambda0, a0, b0, c0, x2, y2, lambda2, a /= m, b /= m, c, depth, stream);
+               stream.point(x2, y2);
+               resampleLineTo(x2, y2, lambda2, a, b, c, x1, y1, lambda1, a1, b1, c1, depth, stream);
+             }
+           }
+         }
 
-       function classArray(string) {
-         return string.trim().split(/^|\s+/);
-       }
+         return function (stream) {
+           var lambda00, x00, y00, a00, b00, c00, // first point
+           lambda0, x0, y0, a0, b0, c0; // previous point
 
-       function classList(node) {
-         return node.classList || new ClassList(node);
-       }
+           var resampleStream = {
+             point: point,
+             lineStart: lineStart,
+             lineEnd: lineEnd,
+             polygonStart: function polygonStart() {
+               stream.polygonStart();
+               resampleStream.lineStart = ringStart;
+             },
+             polygonEnd: function polygonEnd() {
+               stream.polygonEnd();
+               resampleStream.lineStart = lineStart;
+             }
+           };
 
-       function ClassList(node) {
-         this._node = node;
-         this._names = classArray(node.getAttribute("class") || "");
-       }
+           function point(x, y) {
+             x = project(x, y);
+             stream.point(x[0], x[1]);
+           }
 
-       ClassList.prototype = {
-         add: function(name) {
-           var i = this._names.indexOf(name);
-           if (i < 0) {
-             this._names.push(name);
-             this._node.setAttribute("class", this._names.join(" "));
+           function lineStart() {
+             x0 = NaN;
+             resampleStream.point = linePoint;
+             stream.lineStart();
            }
-         },
-         remove: function(name) {
-           var i = this._names.indexOf(name);
-           if (i >= 0) {
-             this._names.splice(i, 1);
-             this._node.setAttribute("class", this._names.join(" "));
+
+           function linePoint(lambda, phi) {
+             var c = cartesian([lambda, phi]),
+                 p = project(lambda, phi);
+             resampleLineTo(x0, y0, lambda0, a0, b0, c0, x0 = p[0], y0 = p[1], lambda0 = lambda, a0 = c[0], b0 = c[1], c0 = c[2], maxDepth, stream);
+             stream.point(x0, y0);
            }
-         },
-         contains: function(name) {
-           return this._names.indexOf(name) >= 0;
-         }
-       };
 
-       function classedAdd(node, names) {
-         var list = classList(node), i = -1, n = names.length;
-         while (++i < n) list.add(names[i]);
-       }
+           function lineEnd() {
+             resampleStream.point = point;
+             stream.lineEnd();
+           }
 
-       function classedRemove(node, names) {
-         var list = classList(node), i = -1, n = names.length;
-         while (++i < n) list.remove(names[i]);
-       }
+           function ringStart() {
+             lineStart();
+             resampleStream.point = ringPoint;
+             resampleStream.lineEnd = ringEnd;
+           }
 
-       function classedTrue(names) {
-         return function() {
-           classedAdd(this, names);
-         };
-       }
+           function ringPoint(lambda, phi) {
+             linePoint(lambda00 = lambda, phi), x00 = x0, y00 = y0, a00 = a0, b00 = b0, c00 = c0;
+             resampleStream.point = linePoint;
+           }
 
-       function classedFalse(names) {
-         return function() {
-           classedRemove(this, names);
-         };
-       }
+           function ringEnd() {
+             resampleLineTo(x0, y0, lambda0, a0, b0, c0, x00, y00, lambda00, a00, b00, c00, maxDepth, stream);
+             resampleStream.lineEnd = lineEnd;
+             lineEnd();
+           }
 
-       function classedFunction(names, value) {
-         return function() {
-           (value.apply(this, arguments) ? classedAdd : classedRemove)(this, names);
+           return resampleStream;
          };
        }
 
-       function selection_classed(name, value) {
-         var names = classArray(name + "");
-
-         if (arguments.length < 2) {
-           var list = classList(this.node()), i = -1, n = names.length;
-           while (++i < n) if (!list.contains(names[i])) return false;
-           return true;
+       var transformRadians = transformer({
+         point: function point(x, y) {
+           this.stream.point(x * radians, y * radians);
          }
+       });
 
-         return this.each((typeof value === "function"
-             ? classedFunction : value
-             ? classedTrue
-             : classedFalse)(names, value));
+       function transformRotate(rotate) {
+         return transformer({
+           point: function point(x, y) {
+             var r = rotate(x, y);
+             return this.stream.point(r[0], r[1]);
+           }
+         });
        }
 
-       function textRemove() {
-         this.textContent = "";
-       }
+       function scaleTranslate(k, dx, dy, sx, sy) {
+         function transform(x, y) {
+           x *= sx;
+           y *= sy;
+           return [dx + k * x, dy - k * y];
+         }
 
-       function textConstant(value) {
-         return function() {
-           this.textContent = value;
+         transform.invert = function (x, y) {
+           return [(x - dx) / k * sx, (dy - y) / k * sy];
          };
-       }
 
-       function textFunction(value) {
-         return function() {
-           var v = value.apply(this, arguments);
-           this.textContent = v == null ? "" : v;
-         };
+         return transform;
        }
 
-       function selection_text(value) {
-         return arguments.length
-             ? this.each(value == null
-                 ? textRemove : (typeof value === "function"
-                 ? textFunction
-                 : textConstant)(value))
-             : this.node().textContent;
-       }
+       function scaleTranslateRotate(k, dx, dy, sx, sy, alpha) {
+         if (!alpha) return scaleTranslate(k, dx, dy, sx, sy);
+         var cosAlpha = cos(alpha),
+             sinAlpha = sin(alpha),
+             a = cosAlpha * k,
+             b = sinAlpha * k,
+             ai = cosAlpha / k,
+             bi = sinAlpha / k,
+             ci = (sinAlpha * dy - cosAlpha * dx) / k,
+             fi = (sinAlpha * dx + cosAlpha * dy) / k;
 
-       function htmlRemove() {
-         this.innerHTML = "";
-       }
+         function transform(x, y) {
+           x *= sx;
+           y *= sy;
+           return [a * x - b * y + dx, dy - b * x - a * y];
+         }
 
-       function htmlConstant(value) {
-         return function() {
-           this.innerHTML = value;
+         transform.invert = function (x, y) {
+           return [sx * (ai * x - bi * y + ci), sy * (fi - bi * x - ai * y)];
          };
-       }
 
-       function htmlFunction(value) {
-         return function() {
-           var v = value.apply(this, arguments);
-           this.innerHTML = v == null ? "" : v;
-         };
+         return transform;
        }
 
-       function selection_html(value) {
-         return arguments.length
-             ? this.each(value == null
-                 ? htmlRemove : (typeof value === "function"
-                 ? htmlFunction
-                 : htmlConstant)(value))
-             : this.node().innerHTML;
+       function projection(project) {
+         return projectionMutator(function () {
+           return project;
+         })();
        }
+       function projectionMutator(projectAt) {
+         var project,
+             k = 150,
+             // scale
+         x = 480,
+             y = 250,
+             // translate
+         lambda = 0,
+             phi = 0,
+             // center
+         deltaLambda = 0,
+             deltaPhi = 0,
+             deltaGamma = 0,
+             rotate,
+             // pre-rotate
+         alpha = 0,
+             // post-rotate angle
+         sx = 1,
+             // reflectX
+         sy = 1,
+             // reflectX
+         theta = null,
+             preclip = clipAntimeridian,
+             // pre-clip angle
+         x0 = null,
+             y0,
+             x1,
+             y1,
+             postclip = identity,
+             // post-clip extent
+         delta2 = 0.5,
+             // precision
+         projectResample,
+             projectTransform,
+             projectRotateTransform,
+             cache,
+             cacheStream;
 
-       function raise() {
-         if (this.nextSibling) this.parentNode.appendChild(this);
-       }
+         function projection(point) {
+           return projectRotateTransform(point[0] * radians, point[1] * radians);
+         }
 
-       function selection_raise() {
-         return this.each(raise);
-       }
+         function invert(point) {
+           point = projectRotateTransform.invert(point[0], point[1]);
+           return point && [point[0] * degrees, point[1] * degrees];
+         }
 
-       function lower() {
-         if (this.previousSibling) this.parentNode.insertBefore(this, this.parentNode.firstChild);
-       }
+         projection.stream = function (stream) {
+           return cache && cacheStream === stream ? cache : cache = transformRadians(transformRotate(rotate)(preclip(projectResample(postclip(cacheStream = stream)))));
+         };
 
-       function selection_lower() {
-         return this.each(lower);
-       }
+         projection.preclip = function (_) {
+           return arguments.length ? (preclip = _, theta = undefined, reset()) : preclip;
+         };
 
-       function selection_append(name) {
-         var create = typeof name === "function" ? name : creator(name);
-         return this.select(function() {
-           return this.appendChild(create.apply(this, arguments));
-         });
-       }
+         projection.postclip = function (_) {
+           return arguments.length ? (postclip = _, x0 = y0 = x1 = y1 = null, reset()) : postclip;
+         };
 
-       function constantNull() {
-         return null;
-       }
+         projection.clipAngle = function (_) {
+           return arguments.length ? (preclip = +_ ? clipCircle(theta = _ * radians) : (theta = null, clipAntimeridian), reset()) : theta * degrees;
+         };
 
-       function selection_insert(name, before) {
-         var create = typeof name === "function" ? name : creator(name),
-             select = before == null ? constantNull : typeof before === "function" ? before : selector(before);
-         return this.select(function() {
-           return this.insertBefore(create.apply(this, arguments), select.apply(this, arguments) || null);
-         });
-       }
+         projection.clipExtent = function (_) {
+           return arguments.length ? (postclip = _ == null ? (x0 = y0 = x1 = y1 = null, identity) : clipRectangle(x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reset()) : x0 == null ? null : [[x0, y0], [x1, y1]];
+         };
 
-       function remove() {
-         var parent = this.parentNode;
-         if (parent) parent.removeChild(this);
-       }
+         projection.scale = function (_) {
+           return arguments.length ? (k = +_, recenter()) : k;
+         };
 
-       function selection_remove() {
-         return this.each(remove);
-       }
+         projection.translate = function (_) {
+           return arguments.length ? (x = +_[0], y = +_[1], recenter()) : [x, y];
+         };
 
-       function selection_cloneShallow() {
-         var clone = this.cloneNode(false), parent = this.parentNode;
-         return parent ? parent.insertBefore(clone, this.nextSibling) : clone;
-       }
+         projection.center = function (_) {
+           return arguments.length ? (lambda = _[0] % 360 * radians, phi = _[1] % 360 * radians, recenter()) : [lambda * degrees, phi * degrees];
+         };
 
-       function selection_cloneDeep() {
-         var clone = this.cloneNode(true), parent = this.parentNode;
-         return parent ? parent.insertBefore(clone, this.nextSibling) : clone;
-       }
+         projection.rotate = function (_) {
+           return arguments.length ? (deltaLambda = _[0] % 360 * radians, deltaPhi = _[1] % 360 * radians, deltaGamma = _.length > 2 ? _[2] % 360 * radians : 0, recenter()) : [deltaLambda * degrees, deltaPhi * degrees, deltaGamma * degrees];
+         };
 
-       function selection_clone(deep) {
-         return this.select(deep ? selection_cloneDeep : selection_cloneShallow);
-       }
+         projection.angle = function (_) {
+           return arguments.length ? (alpha = _ % 360 * radians, recenter()) : alpha * degrees;
+         };
 
-       function selection_datum(value) {
-         return arguments.length
-             ? this.property("__data__", value)
-             : this.node().__data__;
-       }
+         projection.reflectX = function (_) {
+           return arguments.length ? (sx = _ ? -1 : 1, recenter()) : sx < 0;
+         };
+
+         projection.reflectY = function (_) {
+           return arguments.length ? (sy = _ ? -1 : 1, recenter()) : sy < 0;
+         };
+
+         projection.precision = function (_) {
+           return arguments.length ? (projectResample = resample(projectTransform, delta2 = _ * _), reset()) : sqrt$1(delta2);
+         };
+
+         projection.fitExtent = function (extent, object) {
+           return fitExtent(projection, extent, object);
+         };
+
+         projection.fitSize = function (size, object) {
+           return fitSize(projection, size, object);
+         };
 
-       var filterEvents = {};
+         projection.fitWidth = function (width, object) {
+           return fitWidth(projection, width, object);
+         };
 
-       var event = null;
+         projection.fitHeight = function (height, object) {
+           return fitHeight(projection, height, object);
+         };
 
-       if (typeof document !== "undefined") {
-         var element = document.documentElement;
-         if (!("onmouseenter" in element)) {
-           filterEvents = {mouseenter: "mouseover", mouseleave: "mouseout"};
+         function recenter() {
+           var center = scaleTranslateRotate(k, 0, 0, sx, sy, alpha).apply(null, project(lambda, phi)),
+               transform = scaleTranslateRotate(k, x - center[0], y - center[1], sx, sy, alpha);
+           rotate = rotateRadians(deltaLambda, deltaPhi, deltaGamma);
+           projectTransform = compose(project, transform);
+           projectRotateTransform = compose(rotate, projectTransform);
+           projectResample = resample(projectTransform, delta2);
+           return reset();
          }
-       }
 
-       function filterContextListener(listener, index, group) {
-         listener = contextListener(listener, index, group);
-         return function(event) {
-           var related = event.relatedTarget;
-           if (!related || (related !== this && !(related.compareDocumentPosition(this) & 8))) {
-             listener.call(this, event);
-           }
+         function reset() {
+           cache = cacheStream = null;
+           return projection;
+         }
+
+         return function () {
+           project = projectAt.apply(this, arguments);
+           projection.invert = project.invert && invert;
+           return recenter();
          };
        }
 
-       function contextListener(listener, index, group) {
-         return function(event1) {
-           var event0 = event; // Events can be reentrant (e.g., focus).
-           event = event1;
-           try {
-             listener.call(this, this.__data__, index, group);
-           } finally {
-             event = event0;
-           }
-         };
+       function mercatorRaw(lambda, phi) {
+         return [lambda, log$1(tan((halfPi + phi) / 2))];
        }
 
-       function parseTypenames$1(typenames) {
-         return typenames.trim().split(/^|\s+/).map(function(t) {
-           var name = "", i = t.indexOf(".");
-           if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);
-           return {type: t, name: name};
-         });
+       mercatorRaw.invert = function (x, y) {
+         return [x, 2 * atan(exp(y)) - halfPi];
+       };
+
+       function mercator () {
+         return mercatorProjection(mercatorRaw).scale(961 / tau);
        }
+       function mercatorProjection(project) {
+         var m = projection(project),
+             center = m.center,
+             scale = m.scale,
+             translate = m.translate,
+             clipExtent = m.clipExtent,
+             x0 = null,
+             y0,
+             x1,
+             y1; // clip extent
 
-       function onRemove(typename) {
-         return function() {
-           var on = this.__on;
-           if (!on) return;
-           for (var j = 0, i = -1, m = on.length, o; j < m; ++j) {
-             if (o = on[j], (!typename.type || o.type === typename.type) && o.name === typename.name) {
-               this.removeEventListener(o.type, o.listener, o.capture);
-             } else {
-               on[++i] = o;
-             }
-           }
-           if (++i) on.length = i;
-           else delete this.__on;
+         m.scale = function (_) {
+           return arguments.length ? (scale(_), reclip()) : scale();
          };
-       }
 
-       function onAdd(typename, value, capture) {
-         var wrap = filterEvents.hasOwnProperty(typename.type) ? filterContextListener : contextListener;
-         return function(d, i, group) {
-           var on = this.__on, o, listener = wrap(value, i, group);
-           if (on) for (var j = 0, m = on.length; j < m; ++j) {
-             if ((o = on[j]).type === typename.type && o.name === typename.name) {
-               this.removeEventListener(o.type, o.listener, o.capture);
-               this.addEventListener(o.type, o.listener = listener, o.capture = capture);
-               o.value = value;
-               return;
-             }
-           }
-           this.addEventListener(typename.type, listener, capture);
-           o = {type: typename.type, name: typename.name, value: value, listener: listener, capture: capture};
-           if (!on) this.__on = [o];
-           else on.push(o);
+         m.translate = function (_) {
+           return arguments.length ? (translate(_), reclip()) : translate();
          };
-       }
 
-       function selection_on(typename, value, capture) {
-         var typenames = parseTypenames$1(typename + ""), i, n = typenames.length, t;
+         m.center = function (_) {
+           return arguments.length ? (center(_), reclip()) : center();
+         };
 
-         if (arguments.length < 2) {
-           var on = this.node().__on;
-           if (on) for (var j = 0, m = on.length, o; j < m; ++j) {
-             for (i = 0, o = on[j]; i < n; ++i) {
-               if ((t = typenames[i]).type === o.type && t.name === o.name) {
-                 return o.value;
-               }
-             }
-           }
-           return;
+         m.clipExtent = function (_) {
+           return arguments.length ? (_ == null ? x0 = y0 = x1 = y1 = null : (x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reclip()) : x0 == null ? null : [[x0, y0], [x1, y1]];
+         };
+
+         function reclip() {
+           var k = pi * scale(),
+               t = m(rotation(m.rotate()).invert([0, 0]));
+           return clipExtent(x0 == null ? [[t[0] - k, t[1] - k], [t[0] + k, t[1] + k]] : project === mercatorRaw ? [[Math.max(t[0] - k, x0), y0], [Math.min(t[0] + k, x1), y1]] : [[x0, Math.max(t[1] - k, y0)], [x1, Math.min(t[1] + k, y1)]]);
          }
 
-         on = value ? onAdd : onRemove;
-         if (capture == null) capture = false;
-         for (i = 0; i < n; ++i) this.each(on(typenames[i], value, capture));
-         return this;
+         return reclip();
        }
 
-       function customEvent(event1, listener, that, args) {
-         var event0 = event;
-         event1.sourceEvent = event;
-         event = event1;
-         try {
-           return listener.apply(that, args);
-         } finally {
-           event = event0;
+       function d3_geoIdentity () {
+         var k = 1,
+             tx = 0,
+             ty = 0,
+             sx = 1,
+             sy = 1,
+             // scale, translate and reflect
+         alpha = 0,
+             ca,
+             sa,
+             // angle
+         x0 = null,
+             y0,
+             x1,
+             y1,
+             // clip extent
+         kx = 1,
+             ky = 1,
+             transform = transformer({
+           point: function point(x, y) {
+             var p = projection([x, y]);
+             this.stream.point(p[0], p[1]);
+           }
+         }),
+             postclip = identity,
+             cache,
+             cacheStream;
+
+         function reset() {
+           kx = k * sx;
+           ky = k * sy;
+           cache = cacheStream = null;
+           return projection;
          }
-       }
 
-       function dispatchEvent(node, type, params) {
-         var window = defaultView(node),
-             event = window.CustomEvent;
+         function projection(p) {
+           var x = p[0] * kx,
+               y = p[1] * ky;
 
-         if (typeof event === "function") {
-           event = new event(type, params);
-         } else {
-           event = window.document.createEvent("Event");
-           if (params) event.initEvent(type, params.bubbles, params.cancelable), event.detail = params.detail;
-           else event.initEvent(type, false, false);
+           if (alpha) {
+             var t = y * ca - x * sa;
+             x = x * ca + y * sa;
+             y = t;
+           }
+
+           return [x + tx, y + ty];
          }
 
-         node.dispatchEvent(event);
-       }
+         projection.invert = function (p) {
+           var x = p[0] - tx,
+               y = p[1] - ty;
 
-       function dispatchConstant(type, params) {
-         return function() {
-           return dispatchEvent(this, type, params);
+           if (alpha) {
+             var t = y * ca + x * sa;
+             x = x * ca - y * sa;
+             y = t;
+           }
+
+           return [x / kx, y / ky];
          };
-       }
 
-       function dispatchFunction(type, params) {
-         return function() {
-           return dispatchEvent(this, type, params.apply(this, arguments));
+         projection.stream = function (stream) {
+           return cache && cacheStream === stream ? cache : cache = transform(postclip(cacheStream = stream));
          };
-       }
 
-       function selection_dispatch(type, params) {
-         return this.each((typeof params === "function"
-             ? dispatchFunction
-             : dispatchConstant)(type, params));
-       }
+         projection.postclip = function (_) {
+           return arguments.length ? (postclip = _, x0 = y0 = x1 = y1 = null, reset()) : postclip;
+         };
 
-       var root$1 = [null];
+         projection.clipExtent = function (_) {
+           return arguments.length ? (postclip = _ == null ? (x0 = y0 = x1 = y1 = null, identity) : clipRectangle(x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reset()) : x0 == null ? null : [[x0, y0], [x1, y1]];
+         };
 
-       function Selection(groups, parents) {
-         this._groups = groups;
-         this._parents = parents;
-       }
+         projection.scale = function (_) {
+           return arguments.length ? (k = +_, reset()) : k;
+         };
 
-       function selection() {
-         return new Selection([[document.documentElement]], root$1);
-       }
+         projection.translate = function (_) {
+           return arguments.length ? (tx = +_[0], ty = +_[1], reset()) : [tx, ty];
+         };
 
-       Selection.prototype = selection.prototype = {
-         constructor: Selection,
-         select: selection_select,
-         selectAll: selection_selectAll,
-         filter: selection_filter,
-         data: selection_data,
-         enter: selection_enter,
-         exit: selection_exit,
-         join: selection_join,
-         merge: selection_merge,
-         order: selection_order,
-         sort: selection_sort,
-         call: selection_call,
-         nodes: selection_nodes,
-         node: selection_node,
-         size: selection_size,
-         empty: selection_empty,
-         each: selection_each,
-         attr: selection_attr,
-         style: selection_style,
-         property: selection_property,
-         classed: selection_classed,
-         text: selection_text,
-         html: selection_html,
-         raise: selection_raise,
-         lower: selection_lower,
-         append: selection_append,
-         insert: selection_insert,
-         remove: selection_remove,
-         clone: selection_clone,
-         datum: selection_datum,
-         on: selection_on,
-         dispatch: selection_dispatch
-       };
+         projection.angle = function (_) {
+           return arguments.length ? (alpha = _ % 360 * radians, sa = sin(alpha), ca = cos(alpha), reset()) : alpha * degrees;
+         };
 
-       function select(selector) {
-         return typeof selector === "string"
-             ? new Selection([[document.querySelector(selector)]], [document.documentElement])
-             : new Selection([[selector]], root$1);
-       }
+         projection.reflectX = function (_) {
+           return arguments.length ? (sx = _ ? -1 : 1, reset()) : sx < 0;
+         };
 
-       function sourceEvent() {
-         var current = event, source;
-         while (source = current.sourceEvent) current = source;
-         return current;
-       }
+         projection.reflectY = function (_) {
+           return arguments.length ? (sy = _ ? -1 : 1, reset()) : sy < 0;
+         };
 
-       function point(node, event) {
-         var svg = node.ownerSVGElement || node;
+         projection.fitExtent = function (extent, object) {
+           return fitExtent(projection, extent, object);
+         };
 
-         if (svg.createSVGPoint) {
-           var point = svg.createSVGPoint();
-           point.x = event.clientX, point.y = event.clientY;
-           point = point.matrixTransform(node.getScreenCTM().inverse());
-           return [point.x, point.y];
-         }
+         projection.fitSize = function (size, object) {
+           return fitSize(projection, size, object);
+         };
 
-         var rect = node.getBoundingClientRect();
-         return [event.clientX - rect.left - node.clientLeft, event.clientY - rect.top - node.clientTop];
-       }
+         projection.fitWidth = function (width, object) {
+           return fitWidth(projection, width, object);
+         };
+
+         projection.fitHeight = function (height, object) {
+           return fitHeight(projection, height, object);
+         };
 
-       function mouse(node) {
-         var event = sourceEvent();
-         if (event.changedTouches) event = event.changedTouches[0];
-         return point(node, event);
+         return projection;
        }
 
-       function selectAll(selector) {
-         return typeof selector === "string"
-             ? new Selection([document.querySelectorAll(selector)], [document.documentElement])
-             : new Selection([selector == null ? [] : selector], root$1);
+       // constants
+       var TAU = 2 * Math.PI;
+       var EQUATORIAL_RADIUS = 6356752.314245179;
+       var POLAR_RADIUS = 6378137.0;
+       function geoLatToMeters(dLat) {
+         return dLat * (TAU * POLAR_RADIUS / 360);
+       }
+       function geoLonToMeters(dLon, atLat) {
+         return Math.abs(atLat) >= 90 ? 0 : dLon * (TAU * EQUATORIAL_RADIUS / 360) * Math.abs(Math.cos(atLat * (Math.PI / 180)));
+       }
+       function geoMetersToLat(m) {
+         return m / (TAU * POLAR_RADIUS / 360);
+       }
+       function geoMetersToLon(m, atLat) {
+         return Math.abs(atLat) >= 90 ? 0 : m / (TAU * EQUATORIAL_RADIUS / 360) / Math.abs(Math.cos(atLat * (Math.PI / 180)));
+       }
+       function geoMetersToOffset(meters, tileSize) {
+         tileSize = tileSize || 256;
+         return [meters[0] * tileSize / (TAU * EQUATORIAL_RADIUS), -meters[1] * tileSize / (TAU * POLAR_RADIUS)];
        }
+       function geoOffsetToMeters(offset, tileSize) {
+         tileSize = tileSize || 256;
+         return [offset[0] * TAU * EQUATORIAL_RADIUS / tileSize, -offset[1] * TAU * POLAR_RADIUS / tileSize];
+       } // Equirectangular approximation of spherical distances on Earth
 
-       function touch(node, touches, identifier) {
-         if (arguments.length < 3) identifier = touches, touches = sourceEvent().changedTouches;
+       function geoSphericalDistance(a, b) {
+         var x = geoLonToMeters(a[0] - b[0], (a[1] + b[1]) / 2);
+         var y = geoLatToMeters(a[1] - b[1]);
+         return Math.sqrt(x * x + y * y);
+       } // scale to zoom
 
-         for (var i = 0, n = touches ? touches.length : 0, touch; i < n; ++i) {
-           if ((touch = touches[i]).identifier === identifier) {
-             return point(node, touch);
-           }
-         }
+       function geoScaleToZoom(k, tileSize) {
+         tileSize = tileSize || 256;
+         var log2ts = Math.log(tileSize) * Math.LOG2E;
+         return Math.log(k * TAU) / Math.LN2 - log2ts;
+       } // zoom to scale
 
-         return null;
-       }
+       function geoZoomToScale(z, tileSize) {
+         tileSize = tileSize || 256;
+         return tileSize * Math.pow(2, z) / TAU;
+       } // returns info about the node from `nodes` closest to the given `point`
 
-       function nopropagation() {
-         event.stopImmediatePropagation();
-       }
+       function geoSphericalClosestNode(nodes, point) {
+         var minDistance = Infinity,
+             distance;
+         var indexOfMin;
 
-       function noevent() {
-         event.preventDefault();
-         event.stopImmediatePropagation();
-       }
+         for (var i in nodes) {
+           distance = geoSphericalDistance(nodes[i].loc, point);
 
-       function dragDisable(view) {
-         var root = view.document.documentElement,
-             selection = select(view).on("dragstart.drag", noevent, true);
-         if ("onselectstart" in root) {
-           selection.on("selectstart.drag", noevent, true);
+           if (distance < minDistance) {
+             minDistance = distance;
+             indexOfMin = i;
+           }
+         }
+
+         if (indexOfMin !== undefined) {
+           return {
+             index: indexOfMin,
+             distance: minDistance,
+             node: nodes[indexOfMin]
+           };
          } else {
-           root.__noselect = root.style.MozUserSelect;
-           root.style.MozUserSelect = "none";
+           return null;
          }
        }
 
-       function yesdrag(view, noclick) {
-         var root = view.document.documentElement,
-             selection = select(view).on("dragstart.drag", null);
-         if (noclick) {
-           selection.on("click.drag", noevent, true);
-           setTimeout(function() { selection.on("click.drag", null); }, 0);
-         }
-         if ("onselectstart" in root) {
-           selection.on("selectstart.drag", null);
+       function geoExtent(min, max) {
+         if (!(this instanceof geoExtent)) {
+           return new geoExtent(min, max);
+         } else if (min instanceof geoExtent) {
+           return min;
+         } else if (min && min.length === 2 && min[0].length === 2 && min[1].length === 2) {
+           this[0] = min[0];
+           this[1] = min[1];
          } else {
-           root.style.MozUserSelect = root.__noselect;
-           delete root.__noselect;
+           this[0] = min || [Infinity, Infinity];
+           this[1] = max || min || [-Infinity, -Infinity];
          }
        }
+       geoExtent.prototype = new Array(2);
+       Object.assign(geoExtent.prototype, {
+         equals: function equals(obj) {
+           return this[0][0] === obj[0][0] && this[0][1] === obj[0][1] && this[1][0] === obj[1][0] && this[1][1] === obj[1][1];
+         },
+         extend: function extend(obj) {
+           if (!(obj instanceof geoExtent)) obj = new geoExtent(obj);
+           return geoExtent([Math.min(obj[0][0], this[0][0]), Math.min(obj[0][1], this[0][1])], [Math.max(obj[1][0], this[1][0]), Math.max(obj[1][1], this[1][1])]);
+         },
+         _extend: function _extend(extent) {
+           this[0][0] = Math.min(extent[0][0], this[0][0]);
+           this[0][1] = Math.min(extent[0][1], this[0][1]);
+           this[1][0] = Math.max(extent[1][0], this[1][0]);
+           this[1][1] = Math.max(extent[1][1], this[1][1]);
+         },
+         area: function area() {
+           return Math.abs((this[1][0] - this[0][0]) * (this[1][1] - this[0][1]));
+         },
+         center: function center() {
+           return [(this[0][0] + this[1][0]) / 2, (this[0][1] + this[1][1]) / 2];
+         },
+         rectangle: function rectangle() {
+           return [this[0][0], this[0][1], this[1][0], this[1][1]];
+         },
+         bbox: function bbox() {
+           return {
+             minX: this[0][0],
+             minY: this[0][1],
+             maxX: this[1][0],
+             maxY: this[1][1]
+           };
+         },
+         polygon: function polygon() {
+           return [[this[0][0], this[0][1]], [this[0][0], this[1][1]], [this[1][0], this[1][1]], [this[1][0], this[0][1]], [this[0][0], this[0][1]]];
+         },
+         contains: function contains(obj) {
+           if (!(obj instanceof geoExtent)) obj = new geoExtent(obj);
+           return obj[0][0] >= this[0][0] && obj[0][1] >= this[0][1] && obj[1][0] <= this[1][0] && obj[1][1] <= this[1][1];
+         },
+         intersects: function intersects(obj) {
+           if (!(obj instanceof geoExtent)) obj = new geoExtent(obj);
+           return obj[0][0] <= this[1][0] && obj[0][1] <= this[1][1] && obj[1][0] >= this[0][0] && obj[1][1] >= this[0][1];
+         },
+         intersection: function intersection(obj) {
+           if (!this.intersects(obj)) return new geoExtent();
+           return new geoExtent([Math.max(obj[0][0], this[0][0]), Math.max(obj[0][1], this[0][1])], [Math.min(obj[1][0], this[1][0]), Math.min(obj[1][1], this[1][1])]);
+         },
+         percentContainedIn: function percentContainedIn(obj) {
+           if (!(obj instanceof geoExtent)) obj = new geoExtent(obj);
+           var a1 = this.intersection(obj).area();
+           var a2 = this.area();
 
-       function constant$1(x) {
-         return function() {
-           return x;
-         };
-       }
+           if (a1 === Infinity || a2 === Infinity) {
+             return 0;
+           } else if (a1 === 0 || a2 === 0) {
+             if (obj.contains(this)) {
+               return 1;
+             }
 
-       function DragEvent(target, type, subject, id, active, x, y, dx, dy, dispatch) {
-         this.target = target;
-         this.type = type;
-         this.subject = subject;
-         this.identifier = id;
-         this.active = active;
-         this.x = x;
-         this.y = y;
-         this.dx = dx;
-         this.dy = dy;
-         this._ = dispatch;
-       }
+             return 0;
+           } else {
+             return a1 / a2;
+           }
+         },
+         padByMeters: function padByMeters(meters) {
+           var dLat = geoMetersToLat(meters);
+           var dLon = geoMetersToLon(meters, this.center()[1]);
+           return geoExtent([this[0][0] - dLon, this[0][1] - dLat], [this[1][0] + dLon, this[1][1] + dLat]);
+         },
+         toParam: function toParam() {
+           return this.rectangle().join(',');
+         }
+       });
 
-       DragEvent.prototype.on = function() {
-         var value = this._.on.apply(this._, arguments);
-         return value === this._ ? this : value;
-       };
+       var $every$1 = arrayIteration.every;
 
-       // Ignore right-click, since that should open the context menu.
-       function defaultFilter() {
-         return !event.ctrlKey && !event.button;
-       }
 
-       function defaultContainer() {
-         return this.parentNode;
-       }
 
-       function defaultSubject(d) {
-         return d == null ? {x: event.x, y: event.y} : d;
-       }
+       var STRICT_METHOD$6 = arrayMethodIsStrict('every');
+       var USES_TO_LENGTH$8 = arrayMethodUsesToLength('every');
 
-       function defaultTouchable() {
-         return navigator.maxTouchPoints || ("ontouchstart" in this);
-       }
+       // `Array.prototype.every` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.every
+       _export({ target: 'Array', proto: true, forced: !STRICT_METHOD$6 || !USES_TO_LENGTH$8 }, {
+         every: function every(callbackfn /* , thisArg */) {
+           return $every$1(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
+         }
+       });
 
-       function d3_drag() {
-         var filter = defaultFilter,
-             container = defaultContainer,
-             subject = defaultSubject,
-             touchable = defaultTouchable,
-             gestures = {},
-             listeners = dispatch("start", "drag", "end"),
-             active = 0,
-             mousedownx,
-             mousedowny,
-             mousemoving,
-             touchending,
-             clickDistance2 = 0;
+       var $reduce$1 = arrayReduce.left;
 
-         function drag(selection) {
-           selection
-               .on("mousedown.drag", mousedowned)
-             .filter(touchable)
-               .on("touchstart.drag", touchstarted)
-               .on("touchmove.drag", touchmoved)
-               .on("touchend.drag touchcancel.drag", touchended)
-               .style("touch-action", "none")
-               .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
-         }
 
-         function mousedowned() {
-           if (touchending || !filter.apply(this, arguments)) return;
-           var gesture = beforestart("mouse", container.apply(this, arguments), mouse, this, arguments);
-           if (!gesture) return;
-           select(event.view).on("mousemove.drag", mousemoved, true).on("mouseup.drag", mouseupped, true);
-           dragDisable(event.view);
-           nopropagation();
-           mousemoving = false;
-           mousedownx = event.clientX;
-           mousedowny = event.clientY;
-           gesture("start");
-         }
 
-         function mousemoved() {
-           noevent();
-           if (!mousemoving) {
-             var dx = event.clientX - mousedownx, dy = event.clientY - mousedowny;
-             mousemoving = dx * dx + dy * dy > clickDistance2;
-           }
-           gestures.mouse("drag");
-         }
+       var STRICT_METHOD$7 = arrayMethodIsStrict('reduce');
+       var USES_TO_LENGTH$9 = arrayMethodUsesToLength('reduce', { 1: 0 });
 
-         function mouseupped() {
-           select(event.view).on("mousemove.drag mouseup.drag", null);
-           yesdrag(event.view, mousemoving);
-           noevent();
-           gestures.mouse("end");
+       // `Array.prototype.reduce` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.reduce
+       _export({ target: 'Array', proto: true, forced: !STRICT_METHOD$7 || !USES_TO_LENGTH$9 }, {
+         reduce: function reduce(callbackfn /* , initialValue */) {
+           return $reduce$1(this, callbackfn, arguments.length, arguments.length > 1 ? arguments[1] : undefined);
          }
+       });
 
-         function touchstarted() {
-           if (!filter.apply(this, arguments)) return;
-           var touches = event.changedTouches,
-               c = container.apply(this, arguments),
-               n = touches.length, i, gesture;
+       function d3_polygonArea (polygon) {
+         var i = -1,
+             n = polygon.length,
+             a,
+             b = polygon[n - 1],
+             area = 0;
 
-           for (i = 0; i < n; ++i) {
-             if (gesture = beforestart(touches[i].identifier, c, touch, this, arguments)) {
-               nopropagation();
-               gesture("start");
-             }
-           }
+         while (++i < n) {
+           a = b;
+           b = polygon[i];
+           area += a[1] * b[0] - a[0] * b[1];
          }
 
-         function touchmoved() {
-           var touches = event.changedTouches,
-               n = touches.length, i, gesture;
+         return area / 2;
+       }
 
-           for (i = 0; i < n; ++i) {
-             if (gesture = gestures[touches[i].identifier]) {
-               noevent();
-               gesture("drag");
-             }
-           }
+       function d3_polygonCentroid (polygon) {
+         var i = -1,
+             n = polygon.length,
+             x = 0,
+             y = 0,
+             a,
+             b = polygon[n - 1],
+             c,
+             k = 0;
+
+         while (++i < n) {
+           a = b;
+           b = polygon[i];
+           k += c = a[0] * b[1] - b[0] * a[1];
+           x += (a[0] + b[0]) * c;
+           y += (a[1] + b[1]) * c;
          }
 
-         function touchended() {
-           var touches = event.changedTouches,
-               n = touches.length, i, gesture;
+         return k *= 3, [x / k, y / k];
+       }
 
-           if (touchending) clearTimeout(touchending);
-           touchending = setTimeout(function() { touchending = null; }, 500); // Ghost clicks are delayed!
-           for (i = 0; i < n; ++i) {
-             if (gesture = gestures[touches[i].identifier]) {
-               nopropagation();
-               gesture("end");
-             }
+       // Returns the 2D cross product of AB and AC vectors, i.e., the z-component of
+       // the 3D cross product in a quadrant I Cartesian coordinate system (+x is
+       // right, +y is up). Returns a positive value if ABC is counter-clockwise,
+       // negative if clockwise, and zero if the points are collinear.
+       function cross (a, b, c) {
+         return (b[0] - a[0]) * (c[1] - a[1]) - (b[1] - a[1]) * (c[0] - a[0]);
+       }
+
+       function lexicographicOrder(a, b) {
+         return a[0] - b[0] || a[1] - b[1];
+       } // Computes the upper convex hull per the monotone chain algorithm.
+       // Assumes points.length >= 3, is sorted by x, unique in y.
+       // Returns an array of indices into points in left-to-right order.
+
+
+       function computeUpperHullIndexes(points) {
+         var n = points.length,
+             indexes = [0, 1];
+         var size = 2,
+             i;
+
+         for (i = 2; i < n; ++i) {
+           while (size > 1 && cross(points[indexes[size - 2]], points[indexes[size - 1]], points[i]) <= 0) {
+             --size;
            }
+
+           indexes[size++] = i;
          }
 
-         function beforestart(id, container, point, that, args) {
-           var p = point(container, id), s, dx, dy,
-               sublisteners = listeners.copy();
+         return indexes.slice(0, size); // remove popped points
+       }
 
-           if (!customEvent(new DragEvent(drag, "beforestart", s, id, active, p[0], p[1], 0, 0, sublisteners), function() {
-             if ((event.subject = s = subject.apply(that, args)) == null) return false;
-             dx = s.x - p[0] || 0;
-             dy = s.y - p[1] || 0;
-             return true;
-           })) return;
+       function d3_polygonHull (points) {
+         if ((n = points.length) < 3) return null;
+         var i,
+             n,
+             sortedPoints = new Array(n),
+             flippedPoints = new Array(n);
 
-           return function gesture(type) {
-             var p0 = p, n;
-             switch (type) {
-               case "start": gestures[id] = gesture, n = active++; break;
-               case "end": delete gestures[id], --active; // nobreak
-               case "drag": p = point(container, id), n = active; break;
-             }
-             customEvent(new DragEvent(drag, type, s, id, n, p[0] + dx, p[1] + dy, p[0] - p0[0], p[1] - p0[1], sublisteners), sublisteners.apply, sublisteners, [type, that, args]);
-           };
+         for (i = 0; i < n; ++i) {
+           sortedPoints[i] = [+points[i][0], +points[i][1], i];
          }
 
-         drag.filter = function(_) {
-           return arguments.length ? (filter = typeof _ === "function" ? _ : constant$1(!!_), drag) : filter;
-         };
+         sortedPoints.sort(lexicographicOrder);
 
-         drag.container = function(_) {
-           return arguments.length ? (container = typeof _ === "function" ? _ : constant$1(_), drag) : container;
-         };
+         for (i = 0; i < n; ++i) {
+           flippedPoints[i] = [sortedPoints[i][0], -sortedPoints[i][1]];
+         }
 
-         drag.subject = function(_) {
-           return arguments.length ? (subject = typeof _ === "function" ? _ : constant$1(_), drag) : subject;
-         };
+         var upperIndexes = computeUpperHullIndexes(sortedPoints),
+             lowerIndexes = computeUpperHullIndexes(flippedPoints); // Construct the hull polygon, removing possible duplicate endpoints.
 
-         drag.touchable = function(_) {
-           return arguments.length ? (touchable = typeof _ === "function" ? _ : constant$1(!!_), drag) : touchable;
-         };
+         var skipLeft = lowerIndexes[0] === upperIndexes[0],
+             skipRight = lowerIndexes[lowerIndexes.length - 1] === upperIndexes[upperIndexes.length - 1],
+             hull = []; // Add upper hull in right-to-l order.
+         // Then add lower hull in left-to-right order.
 
-         drag.on = function() {
-           var value = listeners.on.apply(listeners, arguments);
-           return value === listeners ? drag : value;
-         };
+         for (i = upperIndexes.length - 1; i >= 0; --i) {
+           hull.push(points[sortedPoints[upperIndexes[i]][2]]);
+         }
 
-         drag.clickDistance = function(_) {
-           return arguments.length ? (clickDistance2 = (_ = +_) * _, drag) : Math.sqrt(clickDistance2);
-         };
+         for (i = +skipLeft; i < lowerIndexes.length - skipRight; ++i) {
+           hull.push(points[sortedPoints[lowerIndexes[i]][2]]);
+         }
 
-         return drag;
+         return hull;
        }
 
-       function define$1(constructor, factory, prototype) {
-         constructor.prototype = factory.prototype = prototype;
-         prototype.constructor = constructor;
-       }
+       // vector equals
+       function geoVecEqual(a, b, epsilon) {
+         if (epsilon) {
+           return Math.abs(a[0] - b[0]) <= epsilon && Math.abs(a[1] - b[1]) <= epsilon;
+         } else {
+           return a[0] === b[0] && a[1] === b[1];
+         }
+       } // vector addition
 
-       function extend(parent, definition) {
-         var prototype = Object.create(parent.prototype);
-         for (var key in definition) prototype[key] = definition[key];
-         return prototype;
-       }
+       function geoVecAdd(a, b) {
+         return [a[0] + b[0], a[1] + b[1]];
+       } // vector subtraction
 
-       function Color() {}
+       function geoVecSubtract(a, b) {
+         return [a[0] - b[0], a[1] - b[1]];
+       } // vector scaling
 
-       var darker = 0.7;
-       var brighter = 1 / darker;
+       function geoVecScale(a, mag) {
+         return [a[0] * mag, a[1] * mag];
+       } // vector rounding (was: geoRoundCoordinates)
 
-       var reI = "\\s*([+-]?\\d+)\\s*",
-           reN = "\\s*([+-]?\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)\\s*",
-           reP = "\\s*([+-]?\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)%\\s*",
-           reHex = /^#([0-9a-f]{3,8})$/,
-           reRgbInteger = new RegExp("^rgb\\(" + [reI, reI, reI] + "\\)$"),
-           reRgbPercent = new RegExp("^rgb\\(" + [reP, reP, reP] + "\\)$"),
-           reRgbaInteger = new RegExp("^rgba\\(" + [reI, reI, reI, reN] + "\\)$"),
-           reRgbaPercent = new RegExp("^rgba\\(" + [reP, reP, reP, reN] + "\\)$"),
-           reHslPercent = new RegExp("^hsl\\(" + [reN, reP, reP] + "\\)$"),
-           reHslaPercent = new RegExp("^hsla\\(" + [reN, reP, reP, reN] + "\\)$");
+       function geoVecFloor(a) {
+         return [Math.floor(a[0]), Math.floor(a[1])];
+       } // linear interpolation
 
-       var named = {
-         aliceblue: 0xf0f8ff,
-         antiquewhite: 0xfaebd7,
-         aqua: 0x00ffff,
-         aquamarine: 0x7fffd4,
-         azure: 0xf0ffff,
-         beige: 0xf5f5dc,
-         bisque: 0xffe4c4,
-         black: 0x000000,
-         blanchedalmond: 0xffebcd,
-         blue: 0x0000ff,
-         blueviolet: 0x8a2be2,
-         brown: 0xa52a2a,
-         burlywood: 0xdeb887,
-         cadetblue: 0x5f9ea0,
-         chartreuse: 0x7fff00,
-         chocolate: 0xd2691e,
-         coral: 0xff7f50,
-         cornflowerblue: 0x6495ed,
-         cornsilk: 0xfff8dc,
-         crimson: 0xdc143c,
-         cyan: 0x00ffff,
-         darkblue: 0x00008b,
-         darkcyan: 0x008b8b,
-         darkgoldenrod: 0xb8860b,
-         darkgray: 0xa9a9a9,
-         darkgreen: 0x006400,
-         darkgrey: 0xa9a9a9,
-         darkkhaki: 0xbdb76b,
-         darkmagenta: 0x8b008b,
-         darkolivegreen: 0x556b2f,
-         darkorange: 0xff8c00,
-         darkorchid: 0x9932cc,
-         darkred: 0x8b0000,
-         darksalmon: 0xe9967a,
-         darkseagreen: 0x8fbc8f,
-         darkslateblue: 0x483d8b,
-         darkslategray: 0x2f4f4f,
-         darkslategrey: 0x2f4f4f,
-         darkturquoise: 0x00ced1,
-         darkviolet: 0x9400d3,
-         deeppink: 0xff1493,
-         deepskyblue: 0x00bfff,
-         dimgray: 0x696969,
-         dimgrey: 0x696969,
-         dodgerblue: 0x1e90ff,
-         firebrick: 0xb22222,
-         floralwhite: 0xfffaf0,
-         forestgreen: 0x228b22,
-         fuchsia: 0xff00ff,
-         gainsboro: 0xdcdcdc,
-         ghostwhite: 0xf8f8ff,
-         gold: 0xffd700,
-         goldenrod: 0xdaa520,
-         gray: 0x808080,
-         green: 0x008000,
-         greenyellow: 0xadff2f,
-         grey: 0x808080,
-         honeydew: 0xf0fff0,
-         hotpink: 0xff69b4,
-         indianred: 0xcd5c5c,
-         indigo: 0x4b0082,
-         ivory: 0xfffff0,
-         khaki: 0xf0e68c,
-         lavender: 0xe6e6fa,
-         lavenderblush: 0xfff0f5,
-         lawngreen: 0x7cfc00,
-         lemonchiffon: 0xfffacd,
-         lightblue: 0xadd8e6,
-         lightcoral: 0xf08080,
-         lightcyan: 0xe0ffff,
-         lightgoldenrodyellow: 0xfafad2,
-         lightgray: 0xd3d3d3,
-         lightgreen: 0x90ee90,
-         lightgrey: 0xd3d3d3,
-         lightpink: 0xffb6c1,
-         lightsalmon: 0xffa07a,
-         lightseagreen: 0x20b2aa,
-         lightskyblue: 0x87cefa,
-         lightslategray: 0x778899,
-         lightslategrey: 0x778899,
-         lightsteelblue: 0xb0c4de,
-         lightyellow: 0xffffe0,
-         lime: 0x00ff00,
-         limegreen: 0x32cd32,
-         linen: 0xfaf0e6,
-         magenta: 0xff00ff,
-         maroon: 0x800000,
-         mediumaquamarine: 0x66cdaa,
-         mediumblue: 0x0000cd,
-         mediumorchid: 0xba55d3,
-         mediumpurple: 0x9370db,
-         mediumseagreen: 0x3cb371,
-         mediumslateblue: 0x7b68ee,
-         mediumspringgreen: 0x00fa9a,
-         mediumturquoise: 0x48d1cc,
-         mediumvioletred: 0xc71585,
-         midnightblue: 0x191970,
-         mintcream: 0xf5fffa,
-         mistyrose: 0xffe4e1,
-         moccasin: 0xffe4b5,
-         navajowhite: 0xffdead,
-         navy: 0x000080,
-         oldlace: 0xfdf5e6,
-         olive: 0x808000,
-         olivedrab: 0x6b8e23,
-         orange: 0xffa500,
-         orangered: 0xff4500,
-         orchid: 0xda70d6,
-         palegoldenrod: 0xeee8aa,
-         palegreen: 0x98fb98,
-         paleturquoise: 0xafeeee,
-         palevioletred: 0xdb7093,
-         papayawhip: 0xffefd5,
-         peachpuff: 0xffdab9,
-         peru: 0xcd853f,
-         pink: 0xffc0cb,
-         plum: 0xdda0dd,
-         powderblue: 0xb0e0e6,
-         purple: 0x800080,
-         rebeccapurple: 0x663399,
-         red: 0xff0000,
-         rosybrown: 0xbc8f8f,
-         royalblue: 0x4169e1,
-         saddlebrown: 0x8b4513,
-         salmon: 0xfa8072,
-         sandybrown: 0xf4a460,
-         seagreen: 0x2e8b57,
-         seashell: 0xfff5ee,
-         sienna: 0xa0522d,
-         silver: 0xc0c0c0,
-         skyblue: 0x87ceeb,
-         slateblue: 0x6a5acd,
-         slategray: 0x708090,
-         slategrey: 0x708090,
-         snow: 0xfffafa,
-         springgreen: 0x00ff7f,
-         steelblue: 0x4682b4,
-         tan: 0xd2b48c,
-         teal: 0x008080,
-         thistle: 0xd8bfd8,
-         tomato: 0xff6347,
-         turquoise: 0x40e0d0,
-         violet: 0xee82ee,
-         wheat: 0xf5deb3,
-         white: 0xffffff,
-         whitesmoke: 0xf5f5f5,
-         yellow: 0xffff00,
-         yellowgreen: 0x9acd32
-       };
+       function geoVecInterp(a, b, t) {
+         return [a[0] + (b[0] - a[0]) * t, a[1] + (b[1] - a[1]) * t];
+       } // http://jsperf.com/id-dist-optimization
 
-       define$1(Color, color, {
-         copy: function(channels) {
-           return Object.assign(new this.constructor, this, channels);
-         },
-         displayable: function() {
-           return this.rgb().displayable();
-         },
-         hex: color_formatHex, // Deprecated! Use color.formatHex.
-         formatHex: color_formatHex,
-         formatHsl: color_formatHsl,
-         formatRgb: color_formatRgb,
-         toString: color_formatRgb
-       });
+       function geoVecLength(a, b) {
+         return Math.sqrt(geoVecLengthSquare(a, b));
+       } // length of vector raised to the power two
 
-       function color_formatHex() {
-         return this.rgb().formatHex();
-       }
+       function geoVecLengthSquare(a, b) {
+         b = b || [0, 0];
+         var x = a[0] - b[0];
+         var y = a[1] - b[1];
+         return x * x + y * y;
+       } // get a unit vector
 
-       function color_formatHsl() {
-         return hslConvert(this).formatHsl();
-       }
+       function geoVecNormalize(a) {
+         var length = Math.sqrt(a[0] * a[0] + a[1] * a[1]);
 
-       function color_formatRgb() {
-         return this.rgb().formatRgb();
-       }
+         if (length !== 0) {
+           return geoVecScale(a, 1 / length);
+         }
 
-       function color(format) {
-         var m, l;
-         format = (format + "").trim().toLowerCase();
-         return (m = reHex.exec(format)) ? (l = m[1].length, m = parseInt(m[1], 16), l === 6 ? rgbn(m) // #ff0000
-             : l === 3 ? new Rgb((m >> 8 & 0xf) | (m >> 4 & 0xf0), (m >> 4 & 0xf) | (m & 0xf0), ((m & 0xf) << 4) | (m & 0xf), 1) // #f00
-             : l === 8 ? rgba(m >> 24 & 0xff, m >> 16 & 0xff, m >> 8 & 0xff, (m & 0xff) / 0xff) // #ff000000
-             : l === 4 ? rgba((m >> 12 & 0xf) | (m >> 8 & 0xf0), (m >> 8 & 0xf) | (m >> 4 & 0xf0), (m >> 4 & 0xf) | (m & 0xf0), (((m & 0xf) << 4) | (m & 0xf)) / 0xff) // #f000
-             : null) // invalid hex
-             : (m = reRgbInteger.exec(format)) ? new Rgb(m[1], m[2], m[3], 1) // rgb(255, 0, 0)
-             : (m = reRgbPercent.exec(format)) ? new Rgb(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, 1) // rgb(100%, 0%, 0%)
-             : (m = reRgbaInteger.exec(format)) ? rgba(m[1], m[2], m[3], m[4]) // rgba(255, 0, 0, 1)
-             : (m = reRgbaPercent.exec(format)) ? rgba(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, m[4]) // rgb(100%, 0%, 0%, 1)
-             : (m = reHslPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, 1) // hsl(120, 50%, 50%)
-             : (m = reHslaPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, m[4]) // hsla(120, 50%, 50%, 1)
-             : named.hasOwnProperty(format) ? rgbn(named[format]) // eslint-disable-line no-prototype-builtins
-             : format === "transparent" ? new Rgb(NaN, NaN, NaN, 0)
-             : null;
-       }
+         return [0, 0];
+       } // Return the counterclockwise angle in the range (-pi, pi)
+       // between the positive X axis and the line intersecting a and b.
 
-       function rgbn(n) {
-         return new Rgb(n >> 16 & 0xff, n >> 8 & 0xff, n & 0xff, 1);
-       }
+       function geoVecAngle(a, b) {
+         return Math.atan2(b[1] - a[1], b[0] - a[0]);
+       } // dot product
 
-       function rgba(r, g, b, a) {
-         if (a <= 0) r = g = b = NaN;
-         return new Rgb(r, g, b, a);
-       }
+       function geoVecDot(a, b, origin) {
+         origin = origin || [0, 0];
+         var p = geoVecSubtract(a, origin);
+         var q = geoVecSubtract(b, origin);
+         return p[0] * q[0] + p[1] * q[1];
+       } // normalized dot product
 
-       function rgbConvert(o) {
-         if (!(o instanceof Color)) o = color(o);
-         if (!o) return new Rgb;
-         o = o.rgb();
-         return new Rgb(o.r, o.g, o.b, o.opacity);
-       }
+       function geoVecNormalizedDot(a, b, origin) {
+         origin = origin || [0, 0];
+         var p = geoVecNormalize(geoVecSubtract(a, origin));
+         var q = geoVecNormalize(geoVecSubtract(b, origin));
+         return geoVecDot(p, q);
+       } // 2D cross product of OA and OB vectors, returns magnitude of Z vector
+       // Returns a positive value, if OAB makes a counter-clockwise turn,
+       // negative for clockwise turn, and zero if the points are collinear.
 
-       function rgb(r, g, b, opacity) {
-         return arguments.length === 1 ? rgbConvert(r) : new Rgb(r, g, b, opacity == null ? 1 : opacity);
-       }
+       function geoVecCross(a, b, origin) {
+         origin = origin || [0, 0];
+         var p = geoVecSubtract(a, origin);
+         var q = geoVecSubtract(b, origin);
+         return p[0] * q[1] - p[1] * q[0];
+       } // find closest orthogonal projection of point onto points array
 
-       function Rgb(r, g, b, opacity) {
-         this.r = +r;
-         this.g = +g;
-         this.b = +b;
-         this.opacity = +opacity;
-       }
+       function geoVecProject(a, points) {
+         var min = Infinity;
+         var idx;
+         var target;
+
+         for (var i = 0; i < points.length - 1; i++) {
+           var o = points[i];
+           var s = geoVecSubtract(points[i + 1], o);
+           var v = geoVecSubtract(a, o);
+           var proj = geoVecDot(v, s) / geoVecDot(s, s);
+           var p;
+
+           if (proj < 0) {
+             p = o;
+           } else if (proj > 1) {
+             p = points[i + 1];
+           } else {
+             p = [o[0] + proj * s[0], o[1] + proj * s[1]];
+           }
 
-       define$1(Rgb, rgb, extend(Color, {
-         brighter: function(k) {
-           k = k == null ? brighter : Math.pow(brighter, k);
-           return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
-         },
-         darker: function(k) {
-           k = k == null ? darker : Math.pow(darker, k);
-           return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
-         },
-         rgb: function() {
-           return this;
-         },
-         displayable: function() {
-           return (-0.5 <= this.r && this.r < 255.5)
-               && (-0.5 <= this.g && this.g < 255.5)
-               && (-0.5 <= this.b && this.b < 255.5)
-               && (0 <= this.opacity && this.opacity <= 1);
-         },
-         hex: rgb_formatHex, // Deprecated! Use color.formatHex.
-         formatHex: rgb_formatHex,
-         formatRgb: rgb_formatRgb,
-         toString: rgb_formatRgb
-       }));
+           var dist = geoVecLength(p, a);
 
-       function rgb_formatHex() {
-         return "#" + hex$1(this.r) + hex$1(this.g) + hex$1(this.b);
-       }
+           if (dist < min) {
+             min = dist;
+             idx = i + 1;
+             target = p;
+           }
+         }
 
-       function rgb_formatRgb() {
-         var a = this.opacity; a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));
-         return (a === 1 ? "rgb(" : "rgba(")
-             + Math.max(0, Math.min(255, Math.round(this.r) || 0)) + ", "
-             + Math.max(0, Math.min(255, Math.round(this.g) || 0)) + ", "
-             + Math.max(0, Math.min(255, Math.round(this.b) || 0))
-             + (a === 1 ? ")" : ", " + a + ")");
+         if (idx !== undefined) {
+           return {
+             index: idx,
+             distance: min,
+             target: target
+           };
+         } else {
+           return null;
+         }
        }
 
-       function hex$1(value) {
-         value = Math.max(0, Math.min(255, Math.round(value) || 0));
-         return (value < 16 ? "0" : "") + value.toString(16);
-       }
+       // between the positive X axis and the line intersecting a and b.
 
-       function hsla(h, s, l, a) {
-         if (a <= 0) h = s = l = NaN;
-         else if (l <= 0 || l >= 1) h = s = NaN;
-         else if (s <= 0) h = NaN;
-         return new Hsl(h, s, l, a);
+       function geoAngle(a, b, projection) {
+         return geoVecAngle(projection(a.loc), projection(b.loc));
        }
+       function geoEdgeEqual(a, b) {
+         return a[0] === b[0] && a[1] === b[1] || a[0] === b[1] && a[1] === b[0];
+       } // Rotate all points counterclockwise around a pivot point by given angle
 
-       function hslConvert(o) {
-         if (o instanceof Hsl) return new Hsl(o.h, o.s, o.l, o.opacity);
-         if (!(o instanceof Color)) o = color(o);
-         if (!o) return new Hsl;
-         if (o instanceof Hsl) return o;
-         o = o.rgb();
-         var r = o.r / 255,
-             g = o.g / 255,
-             b = o.b / 255,
-             min = Math.min(r, g, b),
-             max = Math.max(r, g, b),
-             h = NaN,
-             s = max - min,
-             l = (max + min) / 2;
-         if (s) {
-           if (r === max) h = (g - b) / s + (g < b) * 6;
-           else if (g === max) h = (b - r) / s + 2;
-           else h = (r - g) / s + 4;
-           s /= l < 0.5 ? max + min : 2 - max - min;
-           h *= 60;
-         } else {
-           s = l > 0 && l < 1 ? 0 : h;
-         }
-         return new Hsl(h, s, l, o.opacity);
-       }
+       function geoRotate(points, angle, around) {
+         return points.map(function (point) {
+           var radial = geoVecSubtract(point, around);
+           return [radial[0] * Math.cos(angle) - radial[1] * Math.sin(angle) + around[0], radial[0] * Math.sin(angle) + radial[1] * Math.cos(angle) + around[1]];
+         });
+       } // Choose the edge with the minimal distance from `point` to its orthogonal
+       // projection onto that edge, if such a projection exists, or the distance to
+       // the closest vertex on that edge. Returns an object with the `index` of the
+       // chosen edge, the chosen `loc` on that edge, and the `distance` to to it.
 
-       function hsl(h, s, l, opacity) {
-         return arguments.length === 1 ? hslConvert(h) : new Hsl(h, s, l, opacity == null ? 1 : opacity);
-       }
+       function geoChooseEdge(nodes, point, projection, activeID) {
+         var dist = geoVecLength;
+         var points = nodes.map(function (n) {
+           return projection(n.loc);
+         });
+         var ids = nodes.map(function (n) {
+           return n.id;
+         });
+         var min = Infinity;
+         var idx;
+         var loc;
+
+         for (var i = 0; i < points.length - 1; i++) {
+           if (ids[i] === activeID || ids[i + 1] === activeID) continue;
+           var o = points[i];
+           var s = geoVecSubtract(points[i + 1], o);
+           var v = geoVecSubtract(point, o);
+           var proj = geoVecDot(v, s) / geoVecDot(s, s);
+           var p;
+
+           if (proj < 0) {
+             p = o;
+           } else if (proj > 1) {
+             p = points[i + 1];
+           } else {
+             p = [o[0] + proj * s[0], o[1] + proj * s[1]];
+           }
 
-       function Hsl(h, s, l, opacity) {
-         this.h = +h;
-         this.s = +s;
-         this.l = +l;
-         this.opacity = +opacity;
-       }
+           var d = dist(p, point);
 
-       define$1(Hsl, hsl, extend(Color, {
-         brighter: function(k) {
-           k = k == null ? brighter : Math.pow(brighter, k);
-           return new Hsl(this.h, this.s, this.l * k, this.opacity);
-         },
-         darker: function(k) {
-           k = k == null ? darker : Math.pow(darker, k);
-           return new Hsl(this.h, this.s, this.l * k, this.opacity);
-         },
-         rgb: function() {
-           var h = this.h % 360 + (this.h < 0) * 360,
-               s = isNaN(h) || isNaN(this.s) ? 0 : this.s,
-               l = this.l,
-               m2 = l + (l < 0.5 ? l : 1 - l) * s,
-               m1 = 2 * l - m2;
-           return new Rgb(
-             hsl2rgb(h >= 240 ? h - 240 : h + 120, m1, m2),
-             hsl2rgb(h, m1, m2),
-             hsl2rgb(h < 120 ? h + 240 : h - 120, m1, m2),
-             this.opacity
-           );
-         },
-         displayable: function() {
-           return (0 <= this.s && this.s <= 1 || isNaN(this.s))
-               && (0 <= this.l && this.l <= 1)
-               && (0 <= this.opacity && this.opacity <= 1);
-         },
-         formatHsl: function() {
-           var a = this.opacity; a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));
-           return (a === 1 ? "hsl(" : "hsla(")
-               + (this.h || 0) + ", "
-               + (this.s || 0) * 100 + "%, "
-               + (this.l || 0) * 100 + "%"
-               + (a === 1 ? ")" : ", " + a + ")");
+           if (d < min) {
+             min = d;
+             idx = i + 1;
+             loc = projection.invert(p);
+           }
          }
-       }));
 
-       /* From FvD 13.37, CSS Color Module Level 3 */
-       function hsl2rgb(h, m1, m2) {
-         return (h < 60 ? m1 + (m2 - m1) * h / 60
-             : h < 180 ? m2
-             : h < 240 ? m1 + (m2 - m1) * (240 - h) / 60
-             : m1) * 255;
-       }
+         if (idx !== undefined) {
+           return {
+             index: idx,
+             distance: min,
+             loc: loc
+           };
+         } else {
+           return null;
+         }
+       } // Test active (dragged or drawing) segments against inactive segments
+       // This is used to test e.g. multipolygon rings that cross
+       // `activeNodes` is the ring containing the activeID being dragged.
+       // `inactiveNodes` is the other ring to test against
 
-       function constant$2(x) {
-         return function() {
-           return x;
-         };
-       }
+       function geoHasLineIntersections(activeNodes, inactiveNodes, activeID) {
+         var actives = [];
+         var inactives = [];
+         var j, k, n1, n2, segment; // gather active segments (only segments in activeNodes that contain the activeID)
 
-       function linear(a, d) {
-         return function(t) {
-           return a + t * d;
-         };
-       }
+         for (j = 0; j < activeNodes.length - 1; j++) {
+           n1 = activeNodes[j];
+           n2 = activeNodes[j + 1];
+           segment = [n1.loc, n2.loc];
 
-       function exponential(a, b, y) {
-         return a = Math.pow(a, y), b = Math.pow(b, y) - a, y = 1 / y, function(t) {
-           return Math.pow(a + t * b, y);
-         };
-       }
+           if (n1.id === activeID || n2.id === activeID) {
+             actives.push(segment);
+           }
+         } // gather inactive segments
 
-       function gamma(y) {
-         return (y = +y) === 1 ? nogamma : function(a, b) {
-           return b - a ? exponential(a, b, y) : constant$2(isNaN(a) ? b : a);
-         };
-       }
 
-       function nogamma(a, b) {
-         var d = b - a;
-         return d ? linear(a, d) : constant$2(isNaN(a) ? b : a);
-       }
+         for (j = 0; j < inactiveNodes.length - 1; j++) {
+           n1 = inactiveNodes[j];
+           n2 = inactiveNodes[j + 1];
+           segment = [n1.loc, n2.loc];
+           inactives.push(segment);
+         } // test
 
-       var d3_interpolateRgb = (function rgbGamma(y) {
-         var color = gamma(y);
 
-         function rgb$1(start, end) {
-           var r = color((start = rgb(start)).r, (end = rgb(end)).r),
-               g = color(start.g, end.g),
-               b = color(start.b, end.b),
-               opacity = nogamma(start.opacity, end.opacity);
-           return function(t) {
-             start.r = r(t);
-             start.g = g(t);
-             start.b = b(t);
-             start.opacity = opacity(t);
-             return start + "";
-           };
+         for (j = 0; j < actives.length; j++) {
+           for (k = 0; k < inactives.length; k++) {
+             var p = actives[j];
+             var q = inactives[k];
+             var hit = geoLineIntersection(p, q);
+
+             if (hit) {
+               return true;
+             }
+           }
          }
 
-         rgb$1.gamma = rgbGamma;
+         return false;
+       } // Test active (dragged or drawing) segments against inactive segments
+       // This is used to test whether a way intersects with itself.
 
-         return rgb$1;
-       })(1);
+       function geoHasSelfIntersections(nodes, activeID) {
+         var actives = [];
+         var inactives = [];
+         var j, k; // group active and passive segments along the nodes
 
-       function numberArray(a, b) {
-         if (!b) b = [];
-         var n = a ? Math.min(b.length, a.length) : 0,
-             c = b.slice(),
-             i;
-         return function(t) {
-           for (i = 0; i < n; ++i) c[i] = a[i] * (1 - t) + b[i] * t;
-           return c;
-         };
-       }
+         for (j = 0; j < nodes.length - 1; j++) {
+           var n1 = nodes[j];
+           var n2 = nodes[j + 1];
+           var segment = [n1.loc, n2.loc];
 
-       function isNumberArray(x) {
-         return ArrayBuffer.isView(x) && !(x instanceof DataView);
-       }
+           if (n1.id === activeID || n2.id === activeID) {
+             actives.push(segment);
+           } else {
+             inactives.push(segment);
+           }
+         } // test
 
-       function genericArray(a, b) {
-         var nb = b ? b.length : 0,
-             na = a ? Math.min(nb, a.length) : 0,
-             x = new Array(na),
-             c = new Array(nb),
-             i;
 
-         for (i = 0; i < na; ++i) x[i] = interpolate(a[i], b[i]);
-         for (; i < nb; ++i) c[i] = b[i];
+         for (j = 0; j < actives.length; j++) {
+           for (k = 0; k < inactives.length; k++) {
+             var p = actives[j];
+             var q = inactives[k]; // skip if segments share an endpoint
 
-         return function(t) {
-           for (i = 0; i < na; ++i) c[i] = x[i](t);
-           return c;
-         };
-       }
+             if (geoVecEqual(p[1], q[0]) || geoVecEqual(p[0], q[1]) || geoVecEqual(p[0], q[0]) || geoVecEqual(p[1], q[1])) {
+               continue;
+             }
 
-       function date(a, b) {
-         var d = new Date;
-         return a = +a, b = +b, function(t) {
-           return d.setTime(a * (1 - t) + b * t), d;
-         };
-       }
+             var hit = geoLineIntersection(p, q);
 
-       function d3_interpolateNumber(a, b) {
-         return a = +a, b = +b, function(t) {
-           return a * (1 - t) + b * t;
-         };
-       }
+             if (hit) {
+               var epsilon = 1e-8; // skip if the hit is at the segment's endpoint
 
-       function object(a, b) {
-         var i = {},
-             c = {},
-             k;
+               if (geoVecEqual(p[1], hit, epsilon) || geoVecEqual(p[0], hit, epsilon) || geoVecEqual(q[1], hit, epsilon) || geoVecEqual(q[0], hit, epsilon)) {
+                 continue;
+               } else {
+                 return true;
+               }
+             }
+           }
+         }
 
-         if (a === null || typeof a !== "object") a = {};
-         if (b === null || typeof b !== "object") b = {};
+         return false;
+       } // Return the intersection point of 2 line segments.
+       // From https://github.com/pgkelley4/line-segments-intersect
+       // This uses the vector cross product approach described below:
+       //  http://stackoverflow.com/a/565282/786339
 
-         for (k in b) {
-           if (k in a) {
-             i[k] = interpolate(a[k], b[k]);
-           } else {
-             c[k] = b[k];
+       function geoLineIntersection(a, b) {
+         var p = [a[0][0], a[0][1]];
+         var p2 = [a[1][0], a[1][1]];
+         var q = [b[0][0], b[0][1]];
+         var q2 = [b[1][0], b[1][1]];
+         var r = geoVecSubtract(p2, p);
+         var s = geoVecSubtract(q2, q);
+         var uNumerator = geoVecCross(geoVecSubtract(q, p), r);
+         var denominator = geoVecCross(r, s);
+
+         if (uNumerator && denominator) {
+           var u = uNumerator / denominator;
+           var t = geoVecCross(geoVecSubtract(q, p), s) / denominator;
+
+           if (t >= 0 && t <= 1 && u >= 0 && u <= 1) {
+             return geoVecInterp(p, p2, t);
            }
          }
 
-         return function(t) {
-           for (k in i) c[k] = i[k](t);
-           return c;
-         };
+         return null;
        }
+       function geoPathIntersections(path1, path2) {
+         var intersections = [];
 
-       var reA = /[-+]?(?:\d+\.?\d*|\.?\d+)(?:[eE][-+]?\d+)?/g,
-           reB = new RegExp(reA.source, "g");
+         for (var i = 0; i < path1.length - 1; i++) {
+           for (var j = 0; j < path2.length - 1; j++) {
+             var a = [path1[i], path1[i + 1]];
+             var b = [path2[j], path2[j + 1]];
+             var hit = geoLineIntersection(a, b);
 
-       function zero(b) {
-         return function() {
-           return b;
-         };
-       }
+             if (hit) {
+               intersections.push(hit);
+             }
+           }
+         }
 
-       function one(b) {
-         return function(t) {
-           return b(t) + "";
-         };
+         return intersections;
        }
+       function geoPathHasIntersections(path1, path2) {
+         for (var i = 0; i < path1.length - 1; i++) {
+           for (var j = 0; j < path2.length - 1; j++) {
+             var a = [path1[i], path1[i + 1]];
+             var b = [path2[j], path2[j + 1]];
+             var hit = geoLineIntersection(a, b);
 
-       function interpolateString(a, b) {
-         var bi = reA.lastIndex = reB.lastIndex = 0, // scan index for next number in b
-             am, // current match in a
-             bm, // current match in b
-             bs, // string preceding current number in b, if any
-             i = -1, // index in s
-             s = [], // string constants and placeholders
-             q = []; // number interpolators
-
-         // Coerce inputs to strings.
-         a = a + "", b = b + "";
-
-         // Interpolate pairs of numbers in a & b.
-         while ((am = reA.exec(a))
-             && (bm = reB.exec(b))) {
-           if ((bs = bm.index) > bi) { // a string precedes the next number in b
-             bs = b.slice(bi, bs);
-             if (s[i]) s[i] += bs; // coalesce with previous string
-             else s[++i] = bs;
-           }
-           if ((am = am[0]) === (bm = bm[0])) { // numbers in a & b match
-             if (s[i]) s[i] += bm; // coalesce with previous string
-             else s[++i] = bm;
-           } else { // interpolate non-matching numbers
-             s[++i] = null;
-             q.push({i: i, x: d3_interpolateNumber(am, bm)});
+             if (hit) {
+               return true;
+             }
            }
-           bi = reB.lastIndex;
          }
 
-         // Add remains of b.
-         if (bi < b.length) {
-           bs = b.slice(bi);
-           if (s[i]) s[i] += bs; // coalesce with previous string
-           else s[++i] = bs;
+         return false;
+       } // Return whether point is contained in polygon.
+       //
+       // `point` should be a 2-item array of coordinates.
+       // `polygon` should be an array of 2-item arrays of coordinates.
+       //
+       // From https://github.com/substack/point-in-polygon.
+       // ray-casting algorithm based on
+       // http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html
+       //
+
+       function geoPointInPolygon(point, polygon) {
+         var x = point[0];
+         var y = point[1];
+         var inside = false;
+
+         for (var i = 0, j = polygon.length - 1; i < polygon.length; j = i++) {
+           var xi = polygon[i][0];
+           var yi = polygon[i][1];
+           var xj = polygon[j][0];
+           var yj = polygon[j][1];
+           var intersect = yi > y !== yj > y && x < (xj - xi) * (y - yi) / (yj - yi) + xi;
+           if (intersect) inside = !inside;
          }
 
-         // Special optimization for only a single match.
-         // Otherwise, interpolate each of the numbers and rejoin the string.
-         return s.length < 2 ? (q[0]
-             ? one(q[0].x)
-             : zero(b))
-             : (b = q.length, function(t) {
-                 for (var i = 0, o; i < b; ++i) s[(o = q[i]).i] = o.x(t);
-                 return s.join("");
-               });
+         return inside;
        }
-
-       function interpolate(a, b) {
-         var t = typeof b, c;
-         return b == null || t === "boolean" ? constant$2(b)
-             : (t === "number" ? d3_interpolateNumber
-             : t === "string" ? ((c = color(b)) ? (b = c, d3_interpolateRgb) : interpolateString)
-             : b instanceof color ? d3_interpolateRgb
-             : b instanceof Date ? date
-             : isNumberArray(b) ? numberArray
-             : Array.isArray(b) ? genericArray
-             : typeof b.valueOf !== "function" && typeof b.toString !== "function" || isNaN(b) ? object
-             : d3_interpolateNumber)(a, b);
+       function geoPolygonContainsPolygon(outer, inner) {
+         return inner.every(function (point) {
+           return geoPointInPolygon(point, outer);
+         });
        }
+       function geoPolygonIntersectsPolygon(outer, inner, checkSegments) {
+         function testPoints(outer, inner) {
+           return inner.some(function (point) {
+             return geoPointInPolygon(point, outer);
+           });
+         }
 
-       function interpolateRound(a, b) {
-         return a = +a, b = +b, function(t) {
-           return Math.round(a * (1 - t) + b * t);
-         };
-       }
+         return testPoints(outer, inner) || !!checkSegments && geoPathHasIntersections(outer, inner);
+       } // http://gis.stackexchange.com/questions/22895/finding-minimum-area-rectangle-for-given-points
+       // http://gis.stackexchange.com/questions/3739/generalisation-strategies-for-building-outlines/3756#3756
 
-       var degrees$1 = 180 / Math.PI;
+       function geoGetSmallestSurroundingRectangle(points) {
+         var hull = d3_polygonHull(points);
+         var centroid = d3_polygonCentroid(hull);
+         var minArea = Infinity;
+         var ssrExtent = [];
+         var ssrAngle = 0;
+         var c1 = hull[0];
 
-       var identity$1 = {
-         translateX: 0,
-         translateY: 0,
-         rotate: 0,
-         skewX: 0,
-         scaleX: 1,
-         scaleY: 1
-       };
+         for (var i = 0; i <= hull.length - 1; i++) {
+           var c2 = i === hull.length - 1 ? hull[0] : hull[i + 1];
+           var angle = Math.atan2(c2[1] - c1[1], c2[0] - c1[0]);
+           var poly = geoRotate(hull, -angle, centroid);
+           var extent = poly.reduce(function (extent, point) {
+             return extent.extend(geoExtent(point));
+           }, geoExtent());
+           var area = extent.area();
+
+           if (area < minArea) {
+             minArea = area;
+             ssrExtent = extent;
+             ssrAngle = angle;
+           }
+
+           c1 = c2;
+         }
 
-       function decompose(a, b, c, d, e, f) {
-         var scaleX, scaleY, skewX;
-         if (scaleX = Math.sqrt(a * a + b * b)) a /= scaleX, b /= scaleX;
-         if (skewX = a * c + b * d) c -= a * skewX, d -= b * skewX;
-         if (scaleY = Math.sqrt(c * c + d * d)) c /= scaleY, d /= scaleY, skewX /= scaleY;
-         if (a * d < b * c) a = -a, b = -b, skewX = -skewX, scaleX = -scaleX;
          return {
-           translateX: e,
-           translateY: f,
-           rotate: Math.atan2(b, a) * degrees$1,
-           skewX: Math.atan(skewX) * degrees$1,
-           scaleX: scaleX,
-           scaleY: scaleY
+           poly: geoRotate(ssrExtent.polygon(), ssrAngle, centroid),
+           angle: ssrAngle
          };
        }
+       function geoPathLength(path) {
+         var length = 0;
 
-       var cssNode,
-           cssRoot,
-           cssView,
-           svgNode;
+         for (var i = 0; i < path.length - 1; i++) {
+           length += geoVecLength(path[i], path[i + 1]);
+         }
 
-       function parseCss(value) {
-         if (value === "none") return identity$1;
-         if (!cssNode) cssNode = document.createElement("DIV"), cssRoot = document.documentElement, cssView = document.defaultView;
-         cssNode.style.transform = value;
-         value = cssView.getComputedStyle(cssRoot.appendChild(cssNode), null).getPropertyValue("transform");
-         cssRoot.removeChild(cssNode);
-         value = value.slice(7, -1).split(",");
-         return decompose(+value[0], +value[1], +value[2], +value[3], +value[4], +value[5]);
-       }
+         return length;
+       } // If the given point is at the edge of the padded viewport,
+       // return a vector that will nudge the viewport in that direction
 
-       function parseSvg(value) {
-         if (value == null) return identity$1;
-         if (!svgNode) svgNode = document.createElementNS("http://www.w3.org/2000/svg", "g");
-         svgNode.setAttribute("transform", value);
-         if (!(value = svgNode.transform.baseVal.consolidate())) return identity$1;
-         value = value.matrix;
-         return decompose(value.a, value.b, value.c, value.d, value.e, value.f);
-       }
+       function geoViewportEdge(point, dimensions) {
+         var pad = [80, 20, 50, 20]; // top, right, bottom, left
 
-       function interpolateTransform(parse, pxComma, pxParen, degParen) {
+         var x = 0;
+         var y = 0;
+         if (point[0] > dimensions[0] - pad[1]) x = -10;
+         if (point[0] < pad[3]) x = 10;
+         if (point[1] > dimensions[1] - pad[2]) y = -10;
+         if (point[1] < pad[0]) y = 10;
 
-         function pop(s) {
-           return s.length ? s.pop() + " " : "";
-         }
-
-         function translate(xa, ya, xb, yb, s, q) {
-           if (xa !== xb || ya !== yb) {
-             var i = s.push("translate(", null, pxComma, null, pxParen);
-             q.push({i: i - 4, x: d3_interpolateNumber(xa, xb)}, {i: i - 2, x: d3_interpolateNumber(ya, yb)});
-           } else if (xb || yb) {
-             s.push("translate(" + xb + pxComma + yb + pxParen);
-           }
-         }
-
-         function rotate(a, b, s, q) {
-           if (a !== b) {
-             if (a - b > 180) b += 360; else if (b - a > 180) a += 360; // shortest path
-             q.push({i: s.push(pop(s) + "rotate(", null, degParen) - 2, x: d3_interpolateNumber(a, b)});
-           } else if (b) {
-             s.push(pop(s) + "rotate(" + b + degParen);
-           }
-         }
-
-         function skewX(a, b, s, q) {
-           if (a !== b) {
-             q.push({i: s.push(pop(s) + "skewX(", null, degParen) - 2, x: d3_interpolateNumber(a, b)});
-           } else if (b) {
-             s.push(pop(s) + "skewX(" + b + degParen);
-           }
-         }
-
-         function scale(xa, ya, xb, yb, s, q) {
-           if (xa !== xb || ya !== yb) {
-             var i = s.push(pop(s) + "scale(", null, ",", null, ")");
-             q.push({i: i - 4, x: d3_interpolateNumber(xa, xb)}, {i: i - 2, x: d3_interpolateNumber(ya, yb)});
-           } else if (xb !== 1 || yb !== 1) {
-             s.push(pop(s) + "scale(" + xb + "," + yb + ")");
-           }
-         }
-
-         return function(a, b) {
-           var s = [], // string constants and placeholders
-               q = []; // number interpolators
-           a = parse(a), b = parse(b);
-           translate(a.translateX, a.translateY, b.translateX, b.translateY, s, q);
-           rotate(a.rotate, b.rotate, s, q);
-           skewX(a.skewX, b.skewX, s, q);
-           scale(a.scaleX, a.scaleY, b.scaleX, b.scaleY, s, q);
-           a = b = null; // gc
-           return function(t) {
-             var i = -1, n = q.length, o;
-             while (++i < n) s[(o = q[i]).i] = o.x(t);
-             return s.join("");
-           };
-         };
-       }
-
-       var interpolateTransformCss = interpolateTransform(parseCss, "px, ", "px)", "deg)");
-       var interpolateTransformSvg = interpolateTransform(parseSvg, ", ", ")", ")");
-
-       var rho = Math.SQRT2,
-           rho2 = 2,
-           rho4 = 4,
-           epsilon2$1 = 1e-12;
-
-       function cosh(x) {
-         return ((x = Math.exp(x)) + 1 / x) / 2;
-       }
-
-       function sinh(x) {
-         return ((x = Math.exp(x)) - 1 / x) / 2;
-       }
-
-       function tanh(x) {
-         return ((x = Math.exp(2 * x)) - 1) / (x + 1);
-       }
-
-       // p0 = [ux0, uy0, w0]
-       // p1 = [ux1, uy1, w1]
-       function interpolateZoom(p0, p1) {
-         var ux0 = p0[0], uy0 = p0[1], w0 = p0[2],
-             ux1 = p1[0], uy1 = p1[1], w1 = p1[2],
-             dx = ux1 - ux0,
-             dy = uy1 - uy0,
-             d2 = dx * dx + dy * dy,
-             i,
-             S;
-
-         // Special case for u0 ≅ u1.
-         if (d2 < epsilon2$1) {
-           S = Math.log(w1 / w0) / rho;
-           i = function(t) {
-             return [
-               ux0 + t * dx,
-               uy0 + t * dy,
-               w0 * Math.exp(rho * t * S)
-             ];
-           };
-         }
-
-         // General case.
-         else {
-           var d1 = Math.sqrt(d2),
-               b0 = (w1 * w1 - w0 * w0 + rho4 * d2) / (2 * w0 * rho2 * d1),
-               b1 = (w1 * w1 - w0 * w0 - rho4 * d2) / (2 * w1 * rho2 * d1),
-               r0 = Math.log(Math.sqrt(b0 * b0 + 1) - b0),
-               r1 = Math.log(Math.sqrt(b1 * b1 + 1) - b1);
-           S = (r1 - r0) / rho;
-           i = function(t) {
-             var s = t * S,
-                 coshr0 = cosh(r0),
-                 u = w0 / (rho2 * d1) * (coshr0 * tanh(rho * s + r0) - sinh(r0));
-             return [
-               ux0 + u * dx,
-               uy0 + u * dy,
-               w0 * coshr0 / cosh(rho * s + r0)
-             ];
-           };
+         if (x || y) {
+           return [x, y];
+         } else {
+           return null;
          }
-
-         i.duration = S * 1000;
-
-         return i;
-       }
-
-       function d3_quantize(interpolator, n) {
-         var samples = new Array(n);
-         for (var i = 0; i < n; ++i) samples[i] = interpolator(i / (n - 1));
-         return samples;
-       }
-
-       var frame = 0, // is an animation frame pending?
-           timeout = 0, // is a timeout pending?
-           interval = 0, // are any timers active?
-           pokeDelay = 1000, // how frequently we check for clock skew
-           taskHead,
-           taskTail,
-           clockLast = 0,
-           clockNow = 0,
-           clockSkew = 0,
-           clock = typeof performance === "object" && performance.now ? performance : Date,
-           setFrame = typeof window === "object" && window.requestAnimationFrame ? window.requestAnimationFrame.bind(window) : function(f) { setTimeout(f, 17); };
-
-       function now() {
-         return clockNow || (setFrame(clearNow), clockNow = clock.now() + clockSkew);
-       }
-
-       function clearNow() {
-         clockNow = 0;
-       }
-
-       function Timer() {
-         this._call =
-         this._time =
-         this._next = null;
        }
 
-       Timer.prototype = timer.prototype = {
-         constructor: Timer,
-         restart: function(callback, delay, time) {
-           if (typeof callback !== "function") throw new TypeError("callback is not a function");
-           time = (time == null ? now() : +time) + (delay == null ? 0 : +delay);
-           if (!this._next && taskTail !== this) {
-             if (taskTail) taskTail._next = this;
-             else taskHead = this;
-             taskTail = this;
-           }
-           this._call = callback;
-           this._time = time;
-           sleep();
-         },
-         stop: function() {
-           if (this._call) {
-             this._call = null;
-             this._time = Infinity;
-             sleep();
-           }
-         }
+       var noop$1 = {
+         value: function value() {}
        };
 
-       function timer(callback, delay, time) {
-         var t = new Timer;
-         t.restart(callback, delay, time);
-         return t;
-       }
-
-       function timerFlush() {
-         now(); // Get the current time, if not already set.
-         ++frame; // Pretend we’ve set an alarm, if we haven’t already.
-         var t = taskHead, e;
-         while (t) {
-           if ((e = clockNow - t._time) >= 0) t._call.call(null, e);
-           t = t._next;
-         }
-         --frame;
-       }
-
-       function wake() {
-         clockNow = (clockLast = clock.now()) + clockSkew;
-         frame = timeout = 0;
-         try {
-           timerFlush();
-         } finally {
-           frame = 0;
-           nap();
-           clockNow = 0;
-         }
-       }
-
-       function poke() {
-         var now = clock.now(), delay = now - clockLast;
-         if (delay > pokeDelay) clockSkew -= delay, clockLast = now;
-       }
-
-       function nap() {
-         var t0, t1 = taskHead, t2, time = Infinity;
-         while (t1) {
-           if (t1._call) {
-             if (time > t1._time) time = t1._time;
-             t0 = t1, t1 = t1._next;
-           } else {
-             t2 = t1._next, t1._next = null;
-             t1 = t0 ? t0._next = t2 : taskHead = t2;
-           }
+       function dispatch() {
+         for (var i = 0, n = arguments.length, _ = {}, t; i < n; ++i) {
+           if (!(t = arguments[i] + "") || t in _ || /[\s.]/.test(t)) throw new Error("illegal type: " + t);
+           _[t] = [];
          }
-         taskTail = t0;
-         sleep(time);
-       }
 
-       function sleep(time) {
-         if (frame) return; // Soonest alarm already set, or will be.
-         if (timeout) timeout = clearTimeout(timeout);
-         var delay = time - clockNow; // Strictly less than if we recomputed clockNow.
-         if (delay > 24) {
-           if (time < Infinity) timeout = setTimeout(wake, time - clock.now() - clockSkew);
-           if (interval) interval = clearInterval(interval);
-         } else {
-           if (!interval) clockLast = clock.now(), interval = setInterval(poke, pokeDelay);
-           frame = 1, setFrame(wake);
-         }
+         return new Dispatch$1(_);
        }
 
-       function d3_timeout(callback, delay, time) {
-         var t = new Timer;
-         delay = delay == null ? 0 : +delay;
-         t.restart(function(elapsed) {
-           t.stop();
-           callback(elapsed + delay);
-         }, delay, time);
-         return t;
+       function Dispatch$1(_) {
+         this._ = _;
        }
 
-       var emptyOn = dispatch("start", "end", "cancel", "interrupt");
-       var emptyTween = [];
-
-       var CREATED = 0;
-       var SCHEDULED = 1;
-       var STARTING = 2;
-       var STARTED = 3;
-       var RUNNING = 4;
-       var ENDING = 5;
-       var ENDED = 6;
-
-       function schedule(node, name, id, index, group, timing) {
-         var schedules = node.__transition;
-         if (!schedules) node.__transition = {};
-         else if (id in schedules) return;
-         create$7(node, id, {
-           name: name,
-           index: index, // For context during callback.
-           group: group, // For context during callback.
-           on: emptyOn,
-           tween: emptyTween,
-           time: timing.time,
-           delay: timing.delay,
-           duration: timing.duration,
-           ease: timing.ease,
-           timer: null,
-           state: CREATED
+       function parseTypenames(typenames, types) {
+         return typenames.trim().split(/^|\s+/).map(function (t) {
+           var name = "",
+               i = t.indexOf(".");
+           if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);
+           if (t && !types.hasOwnProperty(t)) throw new Error("unknown type: " + t);
+           return {
+             type: t,
+             name: name
+           };
          });
        }
 
-       function init(node, id) {
-         var schedule = get$2(node, id);
-         if (schedule.state > CREATED) throw new Error("too late; already scheduled");
-         return schedule;
-       }
-
-       function set$1(node, id) {
-         var schedule = get$2(node, id);
-         if (schedule.state > STARTED) throw new Error("too late; already running");
-         return schedule;
-       }
-
-       function get$2(node, id) {
-         var schedule = node.__transition;
-         if (!schedule || !(schedule = schedule[id])) throw new Error("transition not found");
-         return schedule;
-       }
-
-       function create$7(node, id, self) {
-         var schedules = node.__transition,
-             tween;
-
-         // Initialize the self timer when the transition is created.
-         // Note the actual delay is not known until the first callback!
-         schedules[id] = self;
-         self.timer = timer(schedule, 0, self.time);
-
-         function schedule(elapsed) {
-           self.state = SCHEDULED;
-           self.timer.restart(start, self.delay, self.time);
-
-           // If the elapsed delay is less than our first sleep, start immediately.
-           if (self.delay <= elapsed) start(elapsed - self.delay);
-         }
-
-         function start(elapsed) {
-           var i, j, n, o;
+       Dispatch$1.prototype = dispatch.prototype = {
+         constructor: Dispatch$1,
+         on: function on(typename, callback) {
+           var _ = this._,
+               T = parseTypenames(typename + "", _),
+               t,
+               i = -1,
+               n = T.length; // If no callback was specified, return the callback of the given type and name.
 
-           // If the state is not SCHEDULED, then we previously errored on start.
-           if (self.state !== SCHEDULED) return stop();
+           if (arguments.length < 2) {
+             while (++i < n) {
+               if ((t = (typename = T[i]).type) && (t = get$3(_[t], typename.name))) return t;
+             }
 
-           for (i in schedules) {
-             o = schedules[i];
-             if (o.name !== self.name) continue;
+             return;
+           } // If a type was specified, set the callback for the given type and name.
+           // Otherwise, if a null callback was specified, remove callbacks of the given name.
 
-             // While this element already has a starting transition during this frame,
-             // defer starting an interrupting transition until that transition has a
-             // chance to tick (and possibly end); see d3/d3-transition#54!
-             if (o.state === STARTED) return d3_timeout(start);
 
-             // Interrupt the active transition, if any.
-             if (o.state === RUNNING) {
-               o.state = ENDED;
-               o.timer.stop();
-               o.on.call("interrupt", node, node.__data__, o.index, o.group);
-               delete schedules[i];
-             }
+           if (callback != null && typeof callback !== "function") throw new Error("invalid callback: " + callback);
 
-             // Cancel any pre-empted transitions.
-             else if (+i < id) {
-               o.state = ENDED;
-               o.timer.stop();
-               o.on.call("cancel", node, node.__data__, o.index, o.group);
-               delete schedules[i];
+           while (++i < n) {
+             if (t = (typename = T[i]).type) _[t] = set$3(_[t], typename.name, callback);else if (callback == null) for (t in _) {
+               _[t] = set$3(_[t], typename.name, null);
              }
            }
 
-           // Defer the first tick to end of the current frame; see d3/d3#1576.
-           // Note the transition may be canceled after start and before the first tick!
-           // Note this must be scheduled before the start event; see d3/d3-transition#16!
-           // Assuming this is successful, subsequent callbacks go straight to tick.
-           d3_timeout(function() {
-             if (self.state === STARTED) {
-               self.state = RUNNING;
-               self.timer.restart(tick, self.delay, self.time);
-               tick(elapsed);
-             }
-           });
-
-           // Dispatch the start event.
-           // Note this must be done before the tween are initialized.
-           self.state = STARTING;
-           self.on.call("start", node, node.__data__, self.index, self.group);
-           if (self.state !== STARTING) return; // interrupted
-           self.state = STARTED;
+           return this;
+         },
+         copy: function copy() {
+           var copy = {},
+               _ = this._;
 
-           // Initialize the tween, deleting null tween.
-           tween = new Array(n = self.tween.length);
-           for (i = 0, j = -1; i < n; ++i) {
-             if (o = self.tween[i].value.call(node, node.__data__, self.index, self.group)) {
-               tween[++j] = o;
-             }
+           for (var t in _) {
+             copy[t] = _[t].slice();
            }
-           tween.length = j + 1;
-         }
 
-         function tick(elapsed) {
-           var t = elapsed < self.duration ? self.ease.call(null, elapsed / self.duration) : (self.timer.restart(stop), self.state = ENDING, 1),
-               i = -1,
-               n = tween.length;
+           return new Dispatch$1(copy);
+         },
+         call: function call(type, that) {
+           if ((n = arguments.length - 2) > 0) for (var args = new Array(n), i = 0, n, t; i < n; ++i) {
+             args[i] = arguments[i + 2];
+           }
+           if (!this._.hasOwnProperty(type)) throw new Error("unknown type: " + type);
 
-           while (++i < n) {
-             tween[i].call(node, t);
+           for (t = this._[type], i = 0, n = t.length; i < n; ++i) {
+             t[i].value.apply(that, args);
            }
+         },
+         apply: function apply(type, that, args) {
+           if (!this._.hasOwnProperty(type)) throw new Error("unknown type: " + type);
 
-           // Dispatch the end event.
-           if (self.state === ENDING) {
-             self.on.call("end", node, node.__data__, self.index, self.group);
-             stop();
+           for (var t = this._[type], i = 0, n = t.length; i < n; ++i) {
+             t[i].value.apply(that, args);
            }
          }
+       };
 
-         function stop() {
-           self.state = ENDED;
-           self.timer.stop();
-           delete schedules[id];
-           for (var i in schedules) return; // eslint-disable-line no-unused-vars
-           delete node.__transition;
+       function get$3(type, name) {
+         for (var i = 0, n = type.length, c; i < n; ++i) {
+           if ((c = type[i]).name === name) {
+             return c.value;
+           }
          }
        }
 
-       function interrupt(node, name) {
-         var schedules = node.__transition,
-             schedule,
-             active,
-             empty = true,
-             i;
-
-         if (!schedules) return;
-
-         name = name == null ? null : name + "";
-
-         for (i in schedules) {
-           if ((schedule = schedules[i]).name !== name) { empty = false; continue; }
-           active = schedule.state > STARTING && schedule.state < ENDING;
-           schedule.state = ENDED;
-           schedule.timer.stop();
-           schedule.on.call(active ? "interrupt" : "cancel", node, node.__data__, schedule.index, schedule.group);
-           delete schedules[i];
+       function set$3(type, name, callback) {
+         for (var i = 0, n = type.length; i < n; ++i) {
+           if (type[i].name === name) {
+             type[i] = noop$1, type = type.slice(0, i).concat(type.slice(i + 1));
+             break;
+           }
          }
 
-         if (empty) delete node.__transition;
-       }
-
-       function selection_interrupt(name) {
-         return this.each(function() {
-           interrupt(this, name);
+         if (callback != null) type.push({
+           name: name,
+           value: callback
          });
+         return type;
        }
 
-       function tweenRemove(id, name) {
-         var tween0, tween1;
-         return function() {
-           var schedule = set$1(this, id),
-               tween = schedule.tween;
+       var xhtml = "http://www.w3.org/1999/xhtml";
+       var namespaces = {
+         svg: "http://www.w3.org/2000/svg",
+         xhtml: xhtml,
+         xlink: "http://www.w3.org/1999/xlink",
+         xml: "http://www.w3.org/XML/1998/namespace",
+         xmlns: "http://www.w3.org/2000/xmlns/"
+       };
 
-           // If this node shared tween with the previous node,
-           // just assign the updated shared tween and we’re done!
-           // Otherwise, copy-on-write.
-           if (tween !== tween0) {
-             tween1 = tween0 = tween;
-             for (var i = 0, n = tween1.length; i < n; ++i) {
-               if (tween1[i].name === name) {
-                 tween1 = tween1.slice();
-                 tween1.splice(i, 1);
-                 break;
-               }
-             }
-           }
+       function namespace (name) {
+         var prefix = name += "",
+             i = prefix.indexOf(":");
+         if (i >= 0 && (prefix = name.slice(0, i)) !== "xmlns") name = name.slice(i + 1);
+         return namespaces.hasOwnProperty(prefix) ? {
+           space: namespaces[prefix],
+           local: name
+         } : name; // eslint-disable-line no-prototype-builtins
+       }
 
-           schedule.tween = tween1;
+       function creatorInherit(name) {
+         return function () {
+           var document = this.ownerDocument,
+               uri = this.namespaceURI;
+           return uri === xhtml && document.documentElement.namespaceURI === xhtml ? document.createElement(name) : document.createElementNS(uri, name);
          };
        }
 
-       function tweenFunction(id, name, value) {
-         var tween0, tween1;
-         if (typeof value !== "function") throw new Error;
-         return function() {
-           var schedule = set$1(this, id),
-               tween = schedule.tween;
+       function creatorFixed(fullname) {
+         return function () {
+           return this.ownerDocument.createElementNS(fullname.space, fullname.local);
+         };
+       }
 
-           // If this node shared tween with the previous node,
-           // just assign the updated shared tween and we’re done!
-           // Otherwise, copy-on-write.
-           if (tween !== tween0) {
-             tween1 = (tween0 = tween).slice();
-             for (var t = {name: name, value: value}, i = 0, n = tween1.length; i < n; ++i) {
-               if (tween1[i].name === name) {
-                 tween1[i] = t;
-                 break;
-               }
-             }
-             if (i === n) tween1.push(t);
-           }
+       function creator (name) {
+         var fullname = namespace(name);
+         return (fullname.local ? creatorFixed : creatorInherit)(fullname);
+       }
 
-           schedule.tween = tween1;
+       function none() {}
+
+       function selector (selector) {
+         return selector == null ? none : function () {
+           return this.querySelector(selector);
          };
        }
 
-       function transition_tween(name, value) {
-         var id = this._id;
-
-         name += "";
+       function selection_select (select) {
+         if (typeof select !== "function") select = selector(select);
 
-         if (arguments.length < 2) {
-           var tween = get$2(this.node(), id).tween;
-           for (var i = 0, n = tween.length, t; i < n; ++i) {
-             if ((t = tween[i]).name === name) {
-               return t.value;
+         for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
+           for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
+             if ((node = group[i]) && (subnode = select.call(node, node.__data__, i, group))) {
+               if ("__data__" in node) subnode.__data__ = node.__data__;
+               subgroup[i] = subnode;
              }
            }
-           return null;
          }
 
-         return this.each((value == null ? tweenRemove : tweenFunction)(id, name, value));
+         return new Selection(subgroups, this._parents);
        }
 
-       function tweenValue(transition, name, value) {
-         var id = transition._id;
-
-         transition.each(function() {
-           var schedule = set$1(this, id);
-           (schedule.value || (schedule.value = {}))[name] = value.apply(this, arguments);
-         });
-
-         return function(node) {
-           return get$2(node, id).value[name];
-         };
+       function array (x) {
+         return _typeof(x) === "object" && "length" in x ? x // Array, TypedArray, NodeList, array-like
+         : Array.from(x); // Map, Set, iterable, string, or anything else
        }
 
-       function interpolate$1(a, b) {
-         var c;
-         return (typeof b === "number" ? d3_interpolateNumber
-             : b instanceof color ? d3_interpolateRgb
-             : (c = color(b)) ? (b = c, d3_interpolateRgb)
-             : interpolateString)(a, b);
+       function empty() {
+         return [];
        }
 
-       function attrRemove$1(name) {
-         return function() {
-           this.removeAttribute(name);
+       function selectorAll (selector) {
+         return selector == null ? empty : function () {
+           return this.querySelectorAll(selector);
          };
        }
 
-       function attrRemoveNS$1(fullname) {
-         return function() {
-           this.removeAttributeNS(fullname.space, fullname.local);
+       function arrayAll(select) {
+         return function () {
+           var group = select.apply(this, arguments);
+           return group == null ? [] : array(group);
          };
        }
 
-       function attrConstant$1(name, interpolate, value1) {
-         var string00,
-             string1 = value1 + "",
-             interpolate0;
-         return function() {
-           var string0 = this.getAttribute(name);
-           return string0 === string1 ? null
-               : string0 === string00 ? interpolate0
-               : interpolate0 = interpolate(string00 = string0, value1);
-         };
-       }
+       function selection_selectAll (select) {
+         if (typeof select === "function") select = arrayAll(select);else select = selectorAll(select);
 
-       function attrConstantNS$1(fullname, interpolate, value1) {
-         var string00,
-             string1 = value1 + "",
-             interpolate0;
-         return function() {
-           var string0 = this.getAttributeNS(fullname.space, fullname.local);
-           return string0 === string1 ? null
-               : string0 === string00 ? interpolate0
-               : interpolate0 = interpolate(string00 = string0, value1);
-         };
-       }
+         for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {
+           for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
+             if (node = group[i]) {
+               subgroups.push(select.call(node, node.__data__, i, group));
+               parents.push(node);
+             }
+           }
+         }
 
-       function attrFunction$1(name, interpolate, value) {
-         var string00,
-             string10,
-             interpolate0;
-         return function() {
-           var string0, value1 = value(this), string1;
-           if (value1 == null) return void this.removeAttribute(name);
-           string0 = this.getAttribute(name);
-           string1 = value1 + "";
-           return string0 === string1 ? null
-               : string0 === string00 && string1 === string10 ? interpolate0
-               : (string10 = string1, interpolate0 = interpolate(string00 = string0, value1));
-         };
+         return new Selection(subgroups, parents);
        }
 
-       function attrFunctionNS$1(fullname, interpolate, value) {
-         var string00,
-             string10,
-             interpolate0;
-         return function() {
-           var string0, value1 = value(this), string1;
-           if (value1 == null) return void this.removeAttributeNS(fullname.space, fullname.local);
-           string0 = this.getAttributeNS(fullname.space, fullname.local);
-           string1 = value1 + "";
-           return string0 === string1 ? null
-               : string0 === string00 && string1 === string10 ? interpolate0
-               : (string10 = string1, interpolate0 = interpolate(string00 = string0, value1));
-         };
-       }
+       var $find$1 = arrayIteration.find;
 
-       function transition_attr(name, value) {
-         var fullname = namespace(name), i = fullname === "transform" ? interpolateTransformSvg : interpolate$1;
-         return this.attrTween(name, typeof value === "function"
-             ? (fullname.local ? attrFunctionNS$1 : attrFunction$1)(fullname, i, tweenValue(this, "attr." + name, value))
-             : value == null ? (fullname.local ? attrRemoveNS$1 : attrRemove$1)(fullname)
-             : (fullname.local ? attrConstantNS$1 : attrConstant$1)(fullname, i, value));
-       }
 
-       function attrInterpolate(name, i) {
-         return function(t) {
-           this.setAttribute(name, i.call(this, t));
-         };
-       }
 
-       function attrInterpolateNS(fullname, i) {
-         return function(t) {
-           this.setAttributeNS(fullname.space, fullname.local, i.call(this, t));
-         };
-       }
+       var FIND = 'find';
+       var SKIPS_HOLES = true;
 
-       function attrTweenNS(fullname, value) {
-         var t0, i0;
-         function tween() {
-           var i = value.apply(this, arguments);
-           if (i !== i0) t0 = (i0 = i) && attrInterpolateNS(fullname, i);
-           return t0;
-         }
-         tween._value = value;
-         return tween;
-       }
+       var USES_TO_LENGTH$a = arrayMethodUsesToLength(FIND);
 
-       function attrTween(name, value) {
-         var t0, i0;
-         function tween() {
-           var i = value.apply(this, arguments);
-           if (i !== i0) t0 = (i0 = i) && attrInterpolate(name, i);
-           return t0;
+       // Shouldn't skip holes
+       if (FIND in []) Array(1)[FIND](function () { SKIPS_HOLES = false; });
+
+       // `Array.prototype.find` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.find
+       _export({ target: 'Array', proto: true, forced: SKIPS_HOLES || !USES_TO_LENGTH$a }, {
+         find: function find(callbackfn /* , that = undefined */) {
+           return $find$1(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
          }
-         tween._value = value;
-         return tween;
-       }
+       });
 
-       function transition_attrTween(name, value) {
-         var key = "attr." + name;
-         if (arguments.length < 2) return (key = this.tween(key)) && key._value;
-         if (value == null) return this.tween(key, null);
-         if (typeof value !== "function") throw new Error;
-         var fullname = namespace(name);
-         return this.tween(key, (fullname.local ? attrTweenNS : attrTween)(fullname, value));
-       }
+       // https://tc39.github.io/ecma262/#sec-array.prototype-@@unscopables
+       addToUnscopables(FIND);
 
-       function delayFunction(id, value) {
-         return function() {
-           init(this, id).delay = +value.apply(this, arguments);
+       function matcher (selector) {
+         return function () {
+           return this.matches(selector);
          };
        }
-
-       function delayConstant(id, value) {
-         return value = +value, function() {
-           init(this, id).delay = value;
+       function childMatcher(selector) {
+         return function (node) {
+           return node.matches(selector);
          };
        }
 
-       function transition_delay(value) {
-         var id = this._id;
+       var find$1 = Array.prototype.find;
 
-         return arguments.length
-             ? this.each((typeof value === "function"
-                 ? delayFunction
-                 : delayConstant)(id, value))
-             : get$2(this.node(), id).delay;
+       function childFind(match) {
+         return function () {
+           return find$1.call(this.children, match);
+         };
        }
 
-       function durationFunction(id, value) {
-         return function() {
-           set$1(this, id).duration = +value.apply(this, arguments);
-         };
+       function childFirst() {
+         return this.firstElementChild;
        }
 
-       function durationConstant(id, value) {
-         return value = +value, function() {
-           set$1(this, id).duration = value;
-         };
+       function selection_selectChild (match) {
+         return this.select(match == null ? childFirst : childFind(typeof match === "function" ? match : childMatcher(match)));
        }
 
-       function transition_duration(value) {
-         var id = this._id;
+       var filter = Array.prototype.filter;
 
-         return arguments.length
-             ? this.each((typeof value === "function"
-                 ? durationFunction
-                 : durationConstant)(id, value))
-             : get$2(this.node(), id).duration;
+       function children() {
+         return this.children;
        }
 
-       function easeConstant(id, value) {
-         if (typeof value !== "function") throw new Error;
-         return function() {
-           set$1(this, id).ease = value;
+       function childrenFilter(match) {
+         return function () {
+           return filter.call(this.children, match);
          };
        }
 
-       function transition_ease(value) {
-         var id = this._id;
-
-         return arguments.length
-             ? this.each(easeConstant(id, value))
-             : get$2(this.node(), id).ease;
+       function selection_selectChildren (match) {
+         return this.selectAll(match == null ? children : childrenFilter(typeof match === "function" ? match : childMatcher(match)));
        }
 
-       function transition_filter(match) {
+       function selection_filter (match) {
          if (typeof match !== "function") match = matcher(match);
 
          for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
            }
          }
 
-         return new Transition(subgroups, this._parents, this._name, this._id);
+         return new Selection(subgroups, this._parents);
        }
 
-       function transition_merge(transition) {
-         if (transition._id !== this._id) throw new Error;
-
-         for (var groups0 = this._groups, groups1 = transition._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
-           for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
-             if (node = group0[i] || group1[i]) {
-               merge[i] = node;
-             }
-           }
-         }
+       function sparse (update) {
+         return new Array(update.length);
+       }
 
-         for (; j < m0; ++j) {
-           merges[j] = groups0[j];
-         }
-
-         return new Transition(merges, this._parents, this._name, this._id);
+       function selection_enter () {
+         return new Selection(this._enter || this._groups.map(sparse), this._parents);
+       }
+       function EnterNode(parent, datum) {
+         this.ownerDocument = parent.ownerDocument;
+         this.namespaceURI = parent.namespaceURI;
+         this._next = null;
+         this._parent = parent;
+         this.__data__ = datum;
        }
+       EnterNode.prototype = {
+         constructor: EnterNode,
+         appendChild: function appendChild(child) {
+           return this._parent.insertBefore(child, this._next);
+         },
+         insertBefore: function insertBefore(child, next) {
+           return this._parent.insertBefore(child, next);
+         },
+         querySelector: function querySelector(selector) {
+           return this._parent.querySelector(selector);
+         },
+         querySelectorAll: function querySelectorAll(selector) {
+           return this._parent.querySelectorAll(selector);
+         }
+       };
 
-       function start(name) {
-         return (name + "").trim().split(/^|\s+/).every(function(t) {
-           var i = t.indexOf(".");
-           if (i >= 0) t = t.slice(0, i);
-           return !t || t === "start";
-         });
+       function constant (x) {
+         return function () {
+           return x;
+         };
        }
 
-       function onFunction(id, name, listener) {
-         var on0, on1, sit = start(name) ? init : set$1;
-         return function() {
-           var schedule = sit(this, id),
-               on = schedule.on;
+       function bindIndex(parent, group, enter, update, exit, data) {
+         var i = 0,
+             node,
+             groupLength = group.length,
+             dataLength = data.length; // Put any non-null nodes that fit into update.
+         // Put any null nodes into enter.
+         // Put any remaining data into enter.
 
-           // If this node shared a dispatch with the previous node,
-           // just assign the updated shared dispatch and we’re done!
-           // Otherwise, copy-on-write.
-           if (on !== on0) (on1 = (on0 = on).copy()).on(name, listener);
+         for (; i < dataLength; ++i) {
+           if (node = group[i]) {
+             node.__data__ = data[i];
+             update[i] = node;
+           } else {
+             enter[i] = new EnterNode(parent, data[i]);
+           }
+         } // Put any non-null nodes that don’t fit into exit.
 
-           schedule.on = on1;
-         };
+
+         for (; i < groupLength; ++i) {
+           if (node = group[i]) {
+             exit[i] = node;
+           }
+         }
        }
 
-       function transition_on(name, listener) {
-         var id = this._id;
+       function bindKey(parent, group, enter, update, exit, data, key) {
+         var i,
+             node,
+             nodeByKeyValue = new Map(),
+             groupLength = group.length,
+             dataLength = data.length,
+             keyValues = new Array(groupLength),
+             keyValue; // Compute the key for each node.
+         // If multiple nodes have the same key, the duplicates are added to exit.
 
-         return arguments.length < 2
-             ? get$2(this.node(), id).on.on(name)
-             : this.each(onFunction(id, name, listener));
-       }
+         for (i = 0; i < groupLength; ++i) {
+           if (node = group[i]) {
+             keyValues[i] = keyValue = key.call(node, node.__data__, i, group) + "";
 
-       function removeFunction(id) {
-         return function() {
-           var parent = this.parentNode;
-           for (var i in this.__transition) if (+i !== id) return;
-           if (parent) parent.removeChild(this);
-         };
+             if (nodeByKeyValue.has(keyValue)) {
+               exit[i] = node;
+             } else {
+               nodeByKeyValue.set(keyValue, node);
+             }
+           }
+         } // Compute the key for each datum.
+         // If there a node associated with this key, join and add it to update.
+         // If there is not (or the key is a duplicate), add it to enter.
+
+
+         for (i = 0; i < dataLength; ++i) {
+           keyValue = key.call(parent, data[i], i, data) + "";
+
+           if (node = nodeByKeyValue.get(keyValue)) {
+             update[i] = node;
+             node.__data__ = data[i];
+             nodeByKeyValue["delete"](keyValue);
+           } else {
+             enter[i] = new EnterNode(parent, data[i]);
+           }
+         } // Add any remaining nodes that were not bound to data to exit.
+
+
+         for (i = 0; i < groupLength; ++i) {
+           if ((node = group[i]) && nodeByKeyValue.get(keyValues[i]) === node) {
+             exit[i] = node;
+           }
+         }
        }
 
-       function transition_remove() {
-         return this.on("end.remove", removeFunction(this._id));
+       function datum(node) {
+         return node.__data__;
        }
 
-       function transition_select(select) {
-         var name = this._name,
-             id = this._id;
+       function selection_data (value, key) {
+         if (!arguments.length) return Array.from(this, datum);
+         var bind = key ? bindKey : bindIndex,
+             parents = this._parents,
+             groups = this._groups;
+         if (typeof value !== "function") value = constant(value);
 
-         if (typeof select !== "function") select = selector(select);
+         for (var m = groups.length, update = new Array(m), enter = new Array(m), exit = new Array(m), j = 0; j < m; ++j) {
+           var parent = parents[j],
+               group = groups[j],
+               groupLength = group.length,
+               data = array(value.call(parent, parent && parent.__data__, j, parents)),
+               dataLength = data.length,
+               enterGroup = enter[j] = new Array(dataLength),
+               updateGroup = update[j] = new Array(dataLength),
+               exitGroup = exit[j] = new Array(groupLength);
+           bind(parent, group, enterGroup, updateGroup, exitGroup, data, key); // Now connect the enter nodes to their following update node, such that
+           // appendChild can insert the materialized enter node before this node,
+           // rather than at the end of the parent node.
 
-         for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
-           for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
-             if ((node = group[i]) && (subnode = select.call(node, node.__data__, i, group))) {
-               if ("__data__" in node) subnode.__data__ = node.__data__;
-               subgroup[i] = subnode;
-               schedule(subgroup[i], name, id, i, subgroup, get$2(node, id));
+           for (var i0 = 0, i1 = 0, previous, next; i0 < dataLength; ++i0) {
+             if (previous = enterGroup[i0]) {
+               if (i0 >= i1) i1 = i0 + 1;
+
+               while (!(next = updateGroup[i1]) && ++i1 < dataLength) {
+               }
+
+               previous._next = next || null;
              }
            }
          }
 
-         return new Transition(subgroups, this._parents, name, id);
+         update = new Selection(update, parents);
+         update._enter = enter;
+         update._exit = exit;
+         return update;
        }
 
-       function transition_selectAll(select) {
-         var name = this._name,
-             id = this._id;
+       function selection_exit () {
+         return new Selection(this._exit || this._groups.map(sparse), this._parents);
+       }
 
-         if (typeof select !== "function") select = selectorAll(select);
+       function selection_join (onenter, onupdate, onexit) {
+         var enter = this.enter(),
+             update = this,
+             exit = this.exit();
+         enter = typeof onenter === "function" ? onenter(enter) : enter.append(onenter + "");
+         if (onupdate != null) update = onupdate(update);
+         if (onexit == null) exit.remove();else onexit(exit);
+         return enter && update ? enter.merge(update).order() : update;
+       }
 
-         for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {
-           for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
+       function selection_merge (selection) {
+         if (!(selection instanceof Selection)) throw new Error("invalid merge");
+
+         for (var groups0 = this._groups, groups1 = selection._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
+           for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
+             if (node = group0[i] || group1[i]) {
+               merge[i] = node;
+             }
+           }
+         }
+
+         for (; j < m0; ++j) {
+           merges[j] = groups0[j];
+         }
+
+         return new Selection(merges, this._parents);
+       }
+
+       function selection_order () {
+         for (var groups = this._groups, j = -1, m = groups.length; ++j < m;) {
+           for (var group = groups[j], i = group.length - 1, next = group[i], node; --i >= 0;) {
              if (node = group[i]) {
-               for (var children = select.call(node, node.__data__, i, group), child, inherit = get$2(node, id), k = 0, l = children.length; k < l; ++k) {
-                 if (child = children[k]) {
-                   schedule(child, name, id, k, children, inherit);
-                 }
-               }
-               subgroups.push(children);
-               parents.push(node);
+               if (next && node.compareDocumentPosition(next) ^ 4) next.parentNode.insertBefore(node, next);
+               next = node;
              }
            }
          }
 
-         return new Transition(subgroups, parents, name, id);
+         return this;
        }
 
-       var Selection$1 = selection.prototype.constructor;
+       function selection_sort (compare) {
+         if (!compare) compare = ascending;
 
-       function transition_selection() {
-         return new Selection$1(this._groups, this._parents);
+         function compareNode(a, b) {
+           return a && b ? compare(a.__data__, b.__data__) : !a - !b;
+         }
+
+         for (var groups = this._groups, m = groups.length, sortgroups = new Array(m), j = 0; j < m; ++j) {
+           for (var group = groups[j], n = group.length, sortgroup = sortgroups[j] = new Array(n), node, i = 0; i < n; ++i) {
+             if (node = group[i]) {
+               sortgroup[i] = node;
+             }
+           }
+
+           sortgroup.sort(compareNode);
+         }
+
+         return new Selection(sortgroups, this._parents).order();
        }
 
-       function styleNull(name, interpolate) {
-         var string00,
-             string10,
-             interpolate0;
-         return function() {
-           var string0 = styleValue(this, name),
-               string1 = (this.style.removeProperty(name), styleValue(this, name));
-           return string0 === string1 ? null
-               : string0 === string00 && string1 === string10 ? interpolate0
-               : interpolate0 = interpolate(string00 = string0, string10 = string1);
-         };
+       function ascending(a, b) {
+         return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
        }
 
-       function styleRemove$1(name) {
-         return function() {
-           this.style.removeProperty(name);
-         };
+       function selection_call () {
+         var callback = arguments[0];
+         arguments[0] = this;
+         callback.apply(null, arguments);
+         return this;
        }
 
-       function styleConstant$1(name, interpolate, value1) {
-         var string00,
-             string1 = value1 + "",
-             interpolate0;
-         return function() {
-           var string0 = styleValue(this, name);
-           return string0 === string1 ? null
-               : string0 === string00 ? interpolate0
-               : interpolate0 = interpolate(string00 = string0, value1);
-         };
+       function selection_nodes () {
+         return Array.from(this);
        }
 
-       function styleFunction$1(name, interpolate, value) {
-         var string00,
-             string10,
-             interpolate0;
-         return function() {
-           var string0 = styleValue(this, name),
-               value1 = value(this),
-               string1 = value1 + "";
-           if (value1 == null) string1 = value1 = (this.style.removeProperty(name), styleValue(this, name));
-           return string0 === string1 ? null
-               : string0 === string00 && string1 === string10 ? interpolate0
-               : (string10 = string1, interpolate0 = interpolate(string00 = string0, value1));
-         };
+       function selection_node () {
+         for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {
+           for (var group = groups[j], i = 0, n = group.length; i < n; ++i) {
+             var node = group[i];
+             if (node) return node;
+           }
+         }
+
+         return null;
        }
 
-       function styleMaybeRemove(id, name) {
-         var on0, on1, listener0, key = "style." + name, event = "end." + key, remove;
-         return function() {
-           var schedule = set$1(this, id),
-               on = schedule.on,
-               listener = schedule.value[key] == null ? remove || (remove = styleRemove$1(name)) : undefined;
+       function selection_size () {
+         var size = 0;
 
-           // If this node shared a dispatch with the previous node,
-           // just assign the updated shared dispatch and we’re done!
-           // Otherwise, copy-on-write.
-           if (on !== on0 || listener0 !== listener) (on1 = (on0 = on).copy()).on(event, listener0 = listener);
+         var _iterator = _createForOfIteratorHelper(this),
+             _step;
 
-           schedule.on = on1;
-         };
-       }
+         try {
+           for (_iterator.s(); !(_step = _iterator.n()).done;) {
+             var node = _step.value;
+             ++size;
+           } // eslint-disable-line no-unused-vars
 
-       function transition_style(name, value, priority) {
-         var i = (name += "") === "transform" ? interpolateTransformCss : interpolate$1;
-         return value == null ? this
-             .styleTween(name, styleNull(name, i))
-             .on("end.style." + name, styleRemove$1(name))
-           : typeof value === "function" ? this
-             .styleTween(name, styleFunction$1(name, i, tweenValue(this, "style." + name, value)))
-             .each(styleMaybeRemove(this._id, name))
-           : this
-             .styleTween(name, styleConstant$1(name, i, value), priority)
-             .on("end.style." + name, null);
+         } catch (err) {
+           _iterator.e(err);
+         } finally {
+           _iterator.f();
+         }
+
+         return size;
        }
 
-       function styleInterpolate(name, i, priority) {
-         return function(t) {
-           this.style.setProperty(name, i.call(this, t), priority);
-         };
+       function selection_empty () {
+         return !this.node();
        }
 
-       function styleTween(name, value, priority) {
-         var t, i0;
-         function tween() {
-           var i = value.apply(this, arguments);
-           if (i !== i0) t = (i0 = i) && styleInterpolate(name, i, priority);
-           return t;
+       function selection_each (callback) {
+         for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {
+           for (var group = groups[j], i = 0, n = group.length, node; i < n; ++i) {
+             if (node = group[i]) callback.call(node, node.__data__, i, group);
+           }
          }
-         tween._value = value;
-         return tween;
-       }
 
-       function transition_styleTween(name, value, priority) {
-         var key = "style." + (name += "");
-         if (arguments.length < 2) return (key = this.tween(key)) && key._value;
-         if (value == null) return this.tween(key, null);
-         if (typeof value !== "function") throw new Error;
-         return this.tween(key, styleTween(name, value, priority == null ? "" : priority));
+         return this;
        }
 
-       function textConstant$1(value) {
-         return function() {
-           this.textContent = value;
+       function attrRemove(name) {
+         return function () {
+           this.removeAttribute(name);
          };
        }
 
-       function textFunction$1(value) {
-         return function() {
-           var value1 = value(this);
-           this.textContent = value1 == null ? "" : value1;
+       function attrRemoveNS(fullname) {
+         return function () {
+           this.removeAttributeNS(fullname.space, fullname.local);
          };
        }
 
-       function transition_text(value) {
-         return this.tween("text", typeof value === "function"
-             ? textFunction$1(tweenValue(this, "text", value))
-             : textConstant$1(value == null ? "" : value + ""));
+       function attrConstant(name, value) {
+         return function () {
+           this.setAttribute(name, value);
+         };
        }
 
-       function textInterpolate(i) {
-         return function(t) {
-           this.textContent = i.call(this, t);
+       function attrConstantNS(fullname, value) {
+         return function () {
+           this.setAttributeNS(fullname.space, fullname.local, value);
          };
        }
 
-       function textTween(value) {
-         var t0, i0;
-         function tween() {
-           var i = value.apply(this, arguments);
-           if (i !== i0) t0 = (i0 = i) && textInterpolate(i);
-           return t0;
-         }
-         tween._value = value;
-         return tween;
+       function attrFunction(name, value) {
+         return function () {
+           var v = value.apply(this, arguments);
+           if (v == null) this.removeAttribute(name);else this.setAttribute(name, v);
+         };
        }
 
-       function transition_textTween(value) {
-         var key = "text";
-         if (arguments.length < 1) return (key = this.tween(key)) && key._value;
-         if (value == null) return this.tween(key, null);
-         if (typeof value !== "function") throw new Error;
-         return this.tween(key, textTween(value));
+       function attrFunctionNS(fullname, value) {
+         return function () {
+           var v = value.apply(this, arguments);
+           if (v == null) this.removeAttributeNS(fullname.space, fullname.local);else this.setAttributeNS(fullname.space, fullname.local, v);
+         };
        }
 
-       function transition_transition() {
-         var name = this._name,
-             id0 = this._id,
-             id1 = newId();
+       function selection_attr (name, value) {
+         var fullname = namespace(name);
 
-         for (var groups = this._groups, m = groups.length, j = 0; j < m; ++j) {
-           for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
-             if (node = group[i]) {
-               var inherit = get$2(node, id0);
-               schedule(node, name, id1, i, group, {
-                 time: inherit.time + inherit.delay + inherit.duration,
-                 delay: 0,
-                 duration: inherit.duration,
-                 ease: inherit.ease
-               });
-             }
-           }
+         if (arguments.length < 2) {
+           var node = this.node();
+           return fullname.local ? node.getAttributeNS(fullname.space, fullname.local) : node.getAttribute(fullname);
          }
 
-         return new Transition(groups, this._parents, name, id1);
+         return this.each((value == null ? fullname.local ? attrRemoveNS : attrRemove : typeof value === "function" ? fullname.local ? attrFunctionNS : attrFunction : fullname.local ? attrConstantNS : attrConstant)(fullname, value));
        }
 
-       function transition_end() {
-         var on0, on1, that = this, id = that._id, size = that.size();
-         return new Promise(function(resolve, reject) {
-           var cancel = {value: reject},
-               end = {value: function() { if (--size === 0) resolve(); }};
+       function defaultView (node) {
+         return node.ownerDocument && node.ownerDocument.defaultView || // node is a Node
+         node.document && node // node is a Window
+         || node.defaultView; // node is a Document
+       }
 
-           that.each(function() {
-             var schedule = set$1(this, id),
-                 on = schedule.on;
+       function styleRemove(name) {
+         return function () {
+           this.style.removeProperty(name);
+         };
+       }
 
-             // If this node shared a dispatch with the previous node,
-             // just assign the updated shared dispatch and we’re done!
-             // Otherwise, copy-on-write.
-             if (on !== on0) {
-               on1 = (on0 = on).copy();
-               on1._.cancel.push(cancel);
-               on1._.interrupt.push(cancel);
-               on1._.end.push(end);
-             }
+       function styleConstant(name, value, priority) {
+         return function () {
+           this.style.setProperty(name, value, priority);
+         };
+       }
 
-             schedule.on = on1;
-           });
-         });
+       function styleFunction(name, value, priority) {
+         return function () {
+           var v = value.apply(this, arguments);
+           if (v == null) this.style.removeProperty(name);else this.style.setProperty(name, v, priority);
+         };
        }
 
-       var id$3 = 0;
+       function selection_style (name, value, priority) {
+         return arguments.length > 1 ? this.each((value == null ? styleRemove : typeof value === "function" ? styleFunction : styleConstant)(name, value, priority == null ? "" : priority)) : styleValue(this.node(), name);
+       }
+       function styleValue(node, name) {
+         return node.style.getPropertyValue(name) || defaultView(node).getComputedStyle(node, null).getPropertyValue(name);
+       }
 
-       function Transition(groups, parents, name, id) {
-         this._groups = groups;
-         this._parents = parents;
-         this._name = name;
-         this._id = id;
+       function propertyRemove(name) {
+         return function () {
+           delete this[name];
+         };
        }
 
-       function transition(name) {
-         return selection().transition(name);
+       function propertyConstant(name, value) {
+         return function () {
+           this[name] = value;
+         };
        }
 
-       function newId() {
-         return ++id$3;
+       function propertyFunction(name, value) {
+         return function () {
+           var v = value.apply(this, arguments);
+           if (v == null) delete this[name];else this[name] = v;
+         };
        }
 
-       var selection_prototype = selection.prototype;
+       function selection_property (name, value) {
+         return arguments.length > 1 ? this.each((value == null ? propertyRemove : typeof value === "function" ? propertyFunction : propertyConstant)(name, value)) : this.node()[name];
+       }
 
-       Transition.prototype = transition.prototype = {
-         constructor: Transition,
-         select: transition_select,
-         selectAll: transition_selectAll,
-         filter: transition_filter,
-         merge: transition_merge,
-         selection: transition_selection,
-         transition: transition_transition,
-         call: selection_prototype.call,
-         nodes: selection_prototype.nodes,
-         node: selection_prototype.node,
-         size: selection_prototype.size,
-         empty: selection_prototype.empty,
-         each: selection_prototype.each,
-         on: transition_on,
-         attr: transition_attr,
-         attrTween: transition_attrTween,
-         style: transition_style,
-         styleTween: transition_styleTween,
-         text: transition_text,
-         textTween: transition_textTween,
-         remove: transition_remove,
-         tween: transition_tween,
-         delay: transition_delay,
-         duration: transition_duration,
-         ease: transition_ease,
-         end: transition_end
-       };
+       function classArray(string) {
+         return string.trim().split(/^|\s+/);
+       }
 
-       function linear$1(t) {
-         return +t;
+       function classList(node) {
+         return node.classList || new ClassList(node);
        }
 
-       function cubicInOut(t) {
-         return ((t *= 2) <= 1 ? t * t * t : (t -= 2) * t * t + 2) / 2;
+       function ClassList(node) {
+         this._node = node;
+         this._names = classArray(node.getAttribute("class") || "");
        }
 
-       var defaultTiming = {
-         time: null, // Set on use.
-         delay: 0,
-         duration: 250,
-         ease: cubicInOut
-       };
+       ClassList.prototype = {
+         add: function add(name) {
+           var i = this._names.indexOf(name);
 
-       function inherit(node, id) {
-         var timing;
-         while (!(timing = node.__transition) || !(timing = timing[id])) {
-           if (!(node = node.parentNode)) {
-             return defaultTiming.time = now(), defaultTiming;
-           }
-         }
-         return timing;
-       }
+           if (i < 0) {
+             this._names.push(name);
 
-       function selection_transition(name) {
-         var id,
-             timing;
+             this._node.setAttribute("class", this._names.join(" "));
+           }
+         },
+         remove: function remove(name) {
+           var i = this._names.indexOf(name);
 
-         if (name instanceof Transition) {
-           id = name._id, name = name._name;
-         } else {
-           id = newId(), (timing = defaultTiming).time = now(), name = name == null ? null : name + "";
-         }
+           if (i >= 0) {
+             this._names.splice(i, 1);
 
-         for (var groups = this._groups, m = groups.length, j = 0; j < m; ++j) {
-           for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
-             if (node = group[i]) {
-               schedule(node, name, id, i, group, timing || inherit(node, id));
-             }
+             this._node.setAttribute("class", this._names.join(" "));
            }
+         },
+         contains: function contains(name) {
+           return this._names.indexOf(name) >= 0;
          }
+       };
 
-         return new Transition(groups, this._parents, name, id);
+       function classedAdd(node, names) {
+         var list = classList(node),
+             i = -1,
+             n = names.length;
+
+         while (++i < n) {
+           list.add(names[i]);
+         }
        }
 
-       selection.prototype.interrupt = selection_interrupt;
-       selection.prototype.transition = selection_transition;
+       function classedRemove(node, names) {
+         var list = classList(node),
+             i = -1,
+             n = names.length;
 
-       function constant$3(x) {
-         return function() {
-           return x;
-         };
+         while (++i < n) {
+           list.remove(names[i]);
+         }
        }
 
-       function ZoomEvent(target, type, transform) {
-         this.target = target;
-         this.type = type;
-         this.transform = transform;
+       function classedTrue(names) {
+         return function () {
+           classedAdd(this, names);
+         };
        }
 
-       function Transform(k, x, y) {
-         this.k = k;
-         this.x = x;
-         this.y = y;
+       function classedFalse(names) {
+         return function () {
+           classedRemove(this, names);
+         };
        }
 
-       Transform.prototype = {
-         constructor: Transform,
-         scale: function(k) {
-           return k === 1 ? this : new Transform(this.k * k, this.x, this.y);
-         },
-         translate: function(x, y) {
-           return x === 0 & y === 0 ? this : new Transform(this.k, this.x + this.k * x, this.y + this.k * y);
-         },
-         apply: function(point) {
-           return [point[0] * this.k + this.x, point[1] * this.k + this.y];
-         },
-         applyX: function(x) {
-           return x * this.k + this.x;
-         },
-         applyY: function(y) {
-           return y * this.k + this.y;
-         },
-         invert: function(location) {
-           return [(location[0] - this.x) / this.k, (location[1] - this.y) / this.k];
-         },
-         invertX: function(x) {
-           return (x - this.x) / this.k;
-         },
-         invertY: function(y) {
-           return (y - this.y) / this.k;
-         },
-         rescaleX: function(x) {
-           return x.copy().domain(x.range().map(this.invertX, this).map(x.invert, x));
-         },
-         rescaleY: function(y) {
-           return y.copy().domain(y.range().map(this.invertY, this).map(y.invert, y));
-         },
-         toString: function() {
-           return "translate(" + this.x + "," + this.y + ") scale(" + this.k + ")";
-         }
-       };
-
-       var identity$2 = new Transform(1, 0, 0);
-
-       function nopropagation$1() {
-         event.stopImmediatePropagation();
+       function classedFunction(names, value) {
+         return function () {
+           (value.apply(this, arguments) ? classedAdd : classedRemove)(this, names);
+         };
        }
 
-       function noevent$1() {
-         event.preventDefault();
-         event.stopImmediatePropagation();
-       }
+       function selection_classed (name, value) {
+         var names = classArray(name + "");
 
-       // Ignore right-click, since that should open the context menu.
-       function defaultFilter$1() {
-         return !event.ctrlKey && !event.button;
-       }
+         if (arguments.length < 2) {
+           var list = classList(this.node()),
+               i = -1,
+               n = names.length;
 
-       function defaultExtent() {
-         var e = this;
-         if (e instanceof SVGElement) {
-           e = e.ownerSVGElement || e;
-           if (e.hasAttribute("viewBox")) {
-             e = e.viewBox.baseVal;
-             return [[e.x, e.y], [e.x + e.width, e.y + e.height]];
+           while (++i < n) {
+             if (!list.contains(names[i])) return false;
            }
-           return [[0, 0], [e.width.baseVal.value, e.height.baseVal.value]];
+
+           return true;
          }
-         return [[0, 0], [e.clientWidth, e.clientHeight]];
-       }
 
-       function defaultTransform() {
-         return this.__zoom || identity$2;
+         return this.each((typeof value === "function" ? classedFunction : value ? classedTrue : classedFalse)(names, value));
        }
 
-       function defaultWheelDelta() {
-         return -event.deltaY * (event.deltaMode === 1 ? 0.05 : event.deltaMode ? 1 : 0.002);
+       function textRemove() {
+         this.textContent = "";
        }
 
-       function defaultTouchable$1() {
-         return navigator.maxTouchPoints || ("ontouchstart" in this);
+       function textConstant(value) {
+         return function () {
+           this.textContent = value;
+         };
        }
 
-       function defaultConstrain(transform, extent, translateExtent) {
-         var dx0 = transform.invertX(extent[0][0]) - translateExtent[0][0],
-             dx1 = transform.invertX(extent[1][0]) - translateExtent[1][0],
-             dy0 = transform.invertY(extent[0][1]) - translateExtent[0][1],
-             dy1 = transform.invertY(extent[1][1]) - translateExtent[1][1];
-         return transform.translate(
-           dx1 > dx0 ? (dx0 + dx1) / 2 : Math.min(0, dx0) || Math.max(0, dx1),
-           dy1 > dy0 ? (dy0 + dy1) / 2 : Math.min(0, dy0) || Math.max(0, dy1)
-         );
+       function textFunction(value) {
+         return function () {
+           var v = value.apply(this, arguments);
+           this.textContent = v == null ? "" : v;
+         };
        }
 
-       function d3_zoom() {
-         var filter = defaultFilter$1,
-             extent = defaultExtent,
-             constrain = defaultConstrain,
-             wheelDelta = defaultWheelDelta,
-             touchable = defaultTouchable$1,
-             scaleExtent = [0, Infinity],
-             translateExtent = [[-Infinity, -Infinity], [Infinity, Infinity]],
-             duration = 250,
-             interpolate = interpolateZoom,
-             listeners = dispatch("start", "zoom", "end"),
-             touchstarting,
-             touchending,
-             touchDelay = 500,
-             wheelDelay = 150,
-             clickDistance2 = 0;
+       function selection_text (value) {
+         return arguments.length ? this.each(value == null ? textRemove : (typeof value === "function" ? textFunction : textConstant)(value)) : this.node().textContent;
+       }
 
-         function zoom(selection) {
-           selection
-               .property("__zoom", defaultTransform)
-               .on("wheel.zoom", wheeled)
-               .on("mousedown.zoom", mousedowned)
-               .on("dblclick.zoom", dblclicked)
-             .filter(touchable)
-               .on("touchstart.zoom", touchstarted)
-               .on("touchmove.zoom", touchmoved)
-               .on("touchend.zoom touchcancel.zoom", touchended)
-               .style("touch-action", "none")
-               .style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
-         }
-
-         zoom.transform = function(collection, transform, point) {
-           var selection = collection.selection ? collection.selection() : collection;
-           selection.property("__zoom", defaultTransform);
-           if (collection !== selection) {
-             schedule(collection, transform, point);
-           } else {
-             selection.interrupt().each(function() {
-               gesture(this, arguments)
-                   .start()
-                   .zoom(null, typeof transform === "function" ? transform.apply(this, arguments) : transform)
-                   .end();
-             });
-           }
-         };
+       function htmlRemove() {
+         this.innerHTML = "";
+       }
 
-         zoom.scaleBy = function(selection, k, p) {
-           zoom.scaleTo(selection, function() {
-             var k0 = this.__zoom.k,
-                 k1 = typeof k === "function" ? k.apply(this, arguments) : k;
-             return k0 * k1;
-           }, p);
+       function htmlConstant(value) {
+         return function () {
+           this.innerHTML = value;
          };
+       }
 
-         zoom.scaleTo = function(selection, k, p) {
-           zoom.transform(selection, function() {
-             var e = extent.apply(this, arguments),
-                 t0 = this.__zoom,
-                 p0 = p == null ? centroid(e) : typeof p === "function" ? p.apply(this, arguments) : p,
-                 p1 = t0.invert(p0),
-                 k1 = typeof k === "function" ? k.apply(this, arguments) : k;
-             return constrain(translate(scale(t0, k1), p0, p1), e, translateExtent);
-           }, p);
+       function htmlFunction(value) {
+         return function () {
+           var v = value.apply(this, arguments);
+           this.innerHTML = v == null ? "" : v;
          };
+       }
 
-         zoom.translateBy = function(selection, x, y) {
-           zoom.transform(selection, function() {
-             return constrain(this.__zoom.translate(
-               typeof x === "function" ? x.apply(this, arguments) : x,
-               typeof y === "function" ? y.apply(this, arguments) : y
-             ), extent.apply(this, arguments), translateExtent);
-           });
-         };
+       function selection_html (value) {
+         return arguments.length ? this.each(value == null ? htmlRemove : (typeof value === "function" ? htmlFunction : htmlConstant)(value)) : this.node().innerHTML;
+       }
 
-         zoom.translateTo = function(selection, x, y, p) {
-           zoom.transform(selection, function() {
-             var e = extent.apply(this, arguments),
-                 t = this.__zoom,
-                 p0 = p == null ? centroid(e) : typeof p === "function" ? p.apply(this, arguments) : p;
-             return constrain(identity$2.translate(p0[0], p0[1]).scale(t.k).translate(
-               typeof x === "function" ? -x.apply(this, arguments) : -x,
-               typeof y === "function" ? -y.apply(this, arguments) : -y
-             ), e, translateExtent);
-           }, p);
-         };
+       function raise() {
+         if (this.nextSibling) this.parentNode.appendChild(this);
+       }
 
-         function scale(transform, k) {
-           k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], k));
-           return k === transform.k ? transform : new Transform(k, transform.x, transform.y);
-         }
+       function selection_raise () {
+         return this.each(raise);
+       }
 
-         function translate(transform, p0, p1) {
-           var x = p0[0] - p1[0] * transform.k, y = p0[1] - p1[1] * transform.k;
-           return x === transform.x && y === transform.y ? transform : new Transform(transform.k, x, y);
-         }
+       function lower() {
+         if (this.previousSibling) this.parentNode.insertBefore(this, this.parentNode.firstChild);
+       }
 
-         function centroid(extent) {
-           return [(+extent[0][0] + +extent[1][0]) / 2, (+extent[0][1] + +extent[1][1]) / 2];
-         }
+       function selection_lower () {
+         return this.each(lower);
+       }
 
-         function schedule(transition, transform, point) {
-           transition
-               .on("start.zoom", function() { gesture(this, arguments).start(); })
-               .on("interrupt.zoom end.zoom", function() { gesture(this, arguments).end(); })
-               .tween("zoom", function() {
-                 var that = this,
-                     args = arguments,
-                     g = gesture(that, args),
-                     e = extent.apply(that, args),
-                     p = point == null ? centroid(e) : typeof point === "function" ? point.apply(that, args) : point,
-                     w = Math.max(e[1][0] - e[0][0], e[1][1] - e[0][1]),
-                     a = that.__zoom,
-                     b = typeof transform === "function" ? transform.apply(that, args) : transform,
-                     i = interpolate(a.invert(p).concat(w / a.k), b.invert(p).concat(w / b.k));
-                 return function(t) {
-                   if (t === 1) t = b; // Avoid rounding error on end.
-                   else { var l = i(t), k = w / l[2]; t = new Transform(k, p[0] - l[0] * k, p[1] - l[1] * k); }
-                   g.zoom(null, t);
-                 };
-               });
-         }
+       function selection_append (name) {
+         var create = typeof name === "function" ? name : creator(name);
+         return this.select(function () {
+           return this.appendChild(create.apply(this, arguments));
+         });
+       }
 
-         function gesture(that, args, clean) {
-           return (!clean && that.__zooming) || new Gesture(that, args);
-         }
+       function constantNull() {
+         return null;
+       }
 
-         function Gesture(that, args) {
-           this.that = that;
-           this.args = args;
-           this.active = 0;
-           this.extent = extent.apply(that, args);
-           this.taps = 0;
-         }
+       function selection_insert (name, before) {
+         var create = typeof name === "function" ? name : creator(name),
+             select = before == null ? constantNull : typeof before === "function" ? before : selector(before);
+         return this.select(function () {
+           return this.insertBefore(create.apply(this, arguments), select.apply(this, arguments) || null);
+         });
+       }
 
-         Gesture.prototype = {
-           start: function() {
-             if (++this.active === 1) {
-               this.that.__zooming = this;
-               this.emit("start");
-             }
-             return this;
-           },
-           zoom: function(key, transform) {
-             if (this.mouse && key !== "mouse") this.mouse[1] = transform.invert(this.mouse[0]);
-             if (this.touch0 && key !== "touch") this.touch0[1] = transform.invert(this.touch0[0]);
-             if (this.touch1 && key !== "touch") this.touch1[1] = transform.invert(this.touch1[0]);
-             this.that.__zoom = transform;
-             this.emit("zoom");
-             return this;
-           },
-           end: function() {
-             if (--this.active === 0) {
-               delete this.that.__zooming;
-               this.emit("end");
-             }
-             return this;
-           },
-           emit: function(type) {
-             customEvent(new ZoomEvent(zoom, type, this.that.__zoom), listeners.apply, listeners, [type, this.that, this.args]);
-           }
-         };
+       function remove() {
+         var parent = this.parentNode;
+         if (parent) parent.removeChild(this);
+       }
 
-         function wheeled() {
-           if (!filter.apply(this, arguments)) return;
-           var g = gesture(this, arguments),
-               t = this.__zoom,
-               k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], t.k * Math.pow(2, wheelDelta.apply(this, arguments)))),
-               p = mouse(this);
+       function selection_remove () {
+         return this.each(remove);
+       }
 
-           // If the mouse is in the same location as before, reuse it.
-           // If there were recent wheel events, reset the wheel idle timeout.
-           if (g.wheel) {
-             if (g.mouse[0][0] !== p[0] || g.mouse[0][1] !== p[1]) {
-               g.mouse[1] = t.invert(g.mouse[0] = p);
-             }
-             clearTimeout(g.wheel);
-           }
+       function selection_cloneShallow() {
+         var clone = this.cloneNode(false),
+             parent = this.parentNode;
+         return parent ? parent.insertBefore(clone, this.nextSibling) : clone;
+       }
 
-           // If this wheel event won’t trigger a transform change, ignore it.
-           else if (t.k === k) return;
+       function selection_cloneDeep() {
+         var clone = this.cloneNode(true),
+             parent = this.parentNode;
+         return parent ? parent.insertBefore(clone, this.nextSibling) : clone;
+       }
 
-           // Otherwise, capture the mouse point and location at the start.
-           else {
-             g.mouse = [p, t.invert(p)];
-             interrupt(this);
-             g.start();
-           }
+       function selection_clone (deep) {
+         return this.select(deep ? selection_cloneDeep : selection_cloneShallow);
+       }
 
-           noevent$1();
-           g.wheel = setTimeout(wheelidled, wheelDelay);
-           g.zoom("mouse", constrain(translate(scale(t, k), g.mouse[0], g.mouse[1]), g.extent, translateExtent));
+       function selection_datum (value) {
+         return arguments.length ? this.property("__data__", value) : this.node().__data__;
+       }
 
-           function wheelidled() {
-             g.wheel = null;
-             g.end();
-           }
-         }
+       function contextListener(listener) {
+         return function (event) {
+           listener.call(this, event, this.__data__);
+         };
+       }
 
-         function mousedowned() {
-           if (touchending || !filter.apply(this, arguments)) return;
-           var g = gesture(this, arguments, true),
-               v = select(event.view).on("mousemove.zoom", mousemoved, true).on("mouseup.zoom", mouseupped, true),
-               p = mouse(this),
-               x0 = event.clientX,
-               y0 = event.clientY;
+       function parseTypenames$1(typenames) {
+         return typenames.trim().split(/^|\s+/).map(function (t) {
+           var name = "",
+               i = t.indexOf(".");
+           if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);
+           return {
+             type: t,
+             name: name
+           };
+         });
+       }
 
-           dragDisable(event.view);
-           nopropagation$1();
-           g.mouse = [p, this.__zoom.invert(p)];
-           interrupt(this);
-           g.start();
+       function onRemove(typename) {
+         return function () {
+           var on = this.__on;
+           if (!on) return;
 
-           function mousemoved() {
-             noevent$1();
-             if (!g.moved) {
-               var dx = event.clientX - x0, dy = event.clientY - y0;
-               g.moved = dx * dx + dy * dy > clickDistance2;
+           for (var j = 0, i = -1, m = on.length, o; j < m; ++j) {
+             if (o = on[j], (!typename.type || o.type === typename.type) && o.name === typename.name) {
+               this.removeEventListener(o.type, o.listener, o.options);
+             } else {
+               on[++i] = o;
              }
-             g.zoom("mouse", constrain(translate(g.that.__zoom, g.mouse[0] = mouse(g.that), g.mouse[1]), g.extent, translateExtent));
            }
 
-           function mouseupped() {
-             v.on("mousemove.zoom mouseup.zoom", null);
-             yesdrag(event.view, g.moved);
-             noevent$1();
-             g.end();
-           }
-         }
-
-         function dblclicked() {
-           if (!filter.apply(this, arguments)) return;
-           var t0 = this.__zoom,
-               p0 = mouse(this),
-               p1 = t0.invert(p0),
-               k1 = t0.k * (event.shiftKey ? 0.5 : 2),
-               t1 = constrain(translate(scale(t0, k1), p0, p1), extent.apply(this, arguments), translateExtent);
-
-           noevent$1();
-           if (duration > 0) select(this).transition().duration(duration).call(schedule, t1, p0);
-           else select(this).call(zoom.transform, t1);
-         }
-
-         function touchstarted() {
-           if (!filter.apply(this, arguments)) return;
-           var touches = event.touches,
-               n = touches.length,
-               g = gesture(this, arguments, event.changedTouches.length === n),
-               started, i, t, p;
+           if (++i) on.length = i;else delete this.__on;
+         };
+       }
 
-           nopropagation$1();
-           for (i = 0; i < n; ++i) {
-             t = touches[i], p = touch(this, touches, t.identifier);
-             p = [p, this.__zoom.invert(p), t.identifier];
-             if (!g.touch0) g.touch0 = p, started = true, g.taps = 1 + !!touchstarting;
-             else if (!g.touch1 && g.touch0[2] !== p[2]) g.touch1 = p, g.taps = 0;
+       function onAdd(typename, value, options) {
+         return function () {
+           var on = this.__on,
+               o,
+               listener = contextListener(value);
+           if (on) for (var j = 0, m = on.length; j < m; ++j) {
+             if ((o = on[j]).type === typename.type && o.name === typename.name) {
+               this.removeEventListener(o.type, o.listener, o.options);
+               this.addEventListener(o.type, o.listener = listener, o.options = options);
+               o.value = value;
+               return;
+             }
            }
+           this.addEventListener(typename.type, listener, options);
+           o = {
+             type: typename.type,
+             name: typename.name,
+             value: value,
+             listener: listener,
+             options: options
+           };
+           if (!on) this.__on = [o];else on.push(o);
+         };
+       }
 
-           if (touchstarting) touchstarting = clearTimeout(touchstarting);
+       function selection_on (typename, value, options) {
+         var typenames = parseTypenames$1(typename + ""),
+             i,
+             n = typenames.length,
+             t;
 
-           if (started) {
-             if (g.taps < 2) touchstarting = setTimeout(function() { touchstarting = null; }, touchDelay);
-             interrupt(this);
-             g.start();
+         if (arguments.length < 2) {
+           var on = this.node().__on;
+
+           if (on) for (var j = 0, m = on.length, o; j < m; ++j) {
+             for (i = 0, o = on[j]; i < n; ++i) {
+               if ((t = typenames[i]).type === o.type && t.name === o.name) {
+                 return o.value;
+               }
+             }
            }
+           return;
          }
 
-         function touchmoved() {
-           if (!this.__zooming) return;
-           var g = gesture(this, arguments),
-               touches = event.changedTouches,
-               n = touches.length, i, t, p, l;
+         on = value ? onAdd : onRemove;
 
-           noevent$1();
-           if (touchstarting) touchstarting = clearTimeout(touchstarting);
-           g.taps = 0;
-           for (i = 0; i < n; ++i) {
-             t = touches[i], p = touch(this, touches, t.identifier);
-             if (g.touch0 && g.touch0[2] === t.identifier) g.touch0[0] = p;
-             else if (g.touch1 && g.touch1[2] === t.identifier) g.touch1[0] = p;
-           }
-           t = g.that.__zoom;
-           if (g.touch1) {
-             var p0 = g.touch0[0], l0 = g.touch0[1],
-                 p1 = g.touch1[0], l1 = g.touch1[1],
-                 dp = (dp = p1[0] - p0[0]) * dp + (dp = p1[1] - p0[1]) * dp,
-                 dl = (dl = l1[0] - l0[0]) * dl + (dl = l1[1] - l0[1]) * dl;
-             t = scale(t, Math.sqrt(dp / dl));
-             p = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2];
-             l = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2];
-           }
-           else if (g.touch0) p = g.touch0[0], l = g.touch0[1];
-           else return;
-           g.zoom("touch", constrain(translate(t, p, l), g.extent, translateExtent));
+         for (i = 0; i < n; ++i) {
+           this.each(on(typenames[i], value, options));
          }
 
-         function touchended() {
-           if (!this.__zooming) return;
-           var g = gesture(this, arguments),
-               touches = event.changedTouches,
-               n = touches.length, i, t;
+         return this;
+       }
 
-           nopropagation$1();
-           if (touchending) clearTimeout(touchending);
-           touchending = setTimeout(function() { touchending = null; }, touchDelay);
-           for (i = 0; i < n; ++i) {
-             t = touches[i];
-             if (g.touch0 && g.touch0[2] === t.identifier) delete g.touch0;
-             else if (g.touch1 && g.touch1[2] === t.identifier) delete g.touch1;
-           }
-           if (g.touch1 && !g.touch0) g.touch0 = g.touch1, delete g.touch1;
-           if (g.touch0) g.touch0[1] = this.__zoom.invert(g.touch0[0]);
-           else {
-             g.end();
-             // If this was a dbltap, reroute to the (optional) dblclick.zoom handler.
-             if (g.taps === 2) {
-               var p = select(this).on("dblclick.zoom");
-               if (p) p.apply(this, arguments);
-             }
-           }
-         }
+       function dispatchEvent$1(node, type, params) {
+         var window = defaultView(node),
+             event = window.CustomEvent;
 
-         zoom.wheelDelta = function(_) {
-           return arguments.length ? (wheelDelta = typeof _ === "function" ? _ : constant$3(+_), zoom) : wheelDelta;
-         };
+         if (typeof event === "function") {
+           event = new event(type, params);
+         } else {
+           event = window.document.createEvent("Event");
+           if (params) event.initEvent(type, params.bubbles, params.cancelable), event.detail = params.detail;else event.initEvent(type, false, false);
+         }
 
-         zoom.filter = function(_) {
-           return arguments.length ? (filter = typeof _ === "function" ? _ : constant$3(!!_), zoom) : filter;
-         };
+         node.dispatchEvent(event);
+       }
 
-         zoom.touchable = function(_) {
-           return arguments.length ? (touchable = typeof _ === "function" ? _ : constant$3(!!_), zoom) : touchable;
+       function dispatchConstant(type, params) {
+         return function () {
+           return dispatchEvent$1(this, type, params);
          };
+       }
 
-         zoom.extent = function(_) {
-           return arguments.length ? (extent = typeof _ === "function" ? _ : constant$3([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), zoom) : extent;
+       function dispatchFunction(type, params) {
+         return function () {
+           return dispatchEvent$1(this, type, params.apply(this, arguments));
          };
+       }
 
-         zoom.scaleExtent = function(_) {
-           return arguments.length ? (scaleExtent[0] = +_[0], scaleExtent[1] = +_[1], zoom) : [scaleExtent[0], scaleExtent[1]];
-         };
+       function selection_dispatch (type, params) {
+         return this.each((typeof params === "function" ? dispatchFunction : dispatchConstant)(type, params));
+       }
 
-         zoom.translateExtent = function(_) {
-           return arguments.length ? (translateExtent[0][0] = +_[0][0], translateExtent[1][0] = +_[1][0], translateExtent[0][1] = +_[0][1], translateExtent[1][1] = +_[1][1], zoom) : [[translateExtent[0][0], translateExtent[0][1]], [translateExtent[1][0], translateExtent[1][1]]];
-         };
+       var _marked$2 = /*#__PURE__*/regeneratorRuntime.mark(_callee);
 
-         zoom.constrain = function(_) {
-           return arguments.length ? (constrain = _, zoom) : constrain;
-         };
+       function _callee() {
+         var groups, j, m, group, i, n, node;
+         return regeneratorRuntime.wrap(function _callee$(_context) {
+           while (1) {
+             switch (_context.prev = _context.next) {
+               case 0:
+                 groups = this._groups, j = 0, m = groups.length;
 
-         zoom.duration = function(_) {
-           return arguments.length ? (duration = +_, zoom) : duration;
-         };
+               case 1:
+                 if (!(j < m)) {
+                   _context.next = 13;
+                   break;
+                 }
 
-         zoom.interpolate = function(_) {
-           return arguments.length ? (interpolate = _, zoom) : interpolate;
-         };
+                 group = groups[j], i = 0, n = group.length;
 
-         zoom.on = function() {
-           var value = listeners.on.apply(listeners, arguments);
-           return value === listeners ? zoom : value;
-         };
+               case 3:
+                 if (!(i < n)) {
+                   _context.next = 10;
+                   break;
+                 }
 
-         zoom.clickDistance = function(_) {
-           return arguments.length ? (clickDistance2 = (_ = +_) * _, zoom) : Math.sqrt(clickDistance2);
-         };
+                 if (!(node = group[i])) {
+                   _context.next = 7;
+                   break;
+                 }
 
-         return zoom;
-       }
+                 _context.next = 7;
+                 return node;
 
-       /*
-           Bypasses features of D3's default projection stream pipeline that are unnecessary:
-           * Antimeridian clipping
-           * Spherical rotation
-           * Resampling
-       */
-       function geoRawMercator() {
-           var project = mercatorRaw;
-           var k = 512 / Math.PI; // scale
-           var x = 0;
-           var y = 0; // translate
-           var clipExtent = [[0, 0], [0, 0]];
+               case 7:
+                 ++i;
+                 _context.next = 3;
+                 break;
 
+               case 10:
+                 ++j;
+                 _context.next = 1;
+                 break;
 
-           function projection(point) {
-               point = project(point[0] * Math.PI / 180, point[1] * Math.PI / 180);
-               return [point[0] * k + x, y - point[1] * k];
+               case 13:
+               case "end":
+                 return _context.stop();
+             }
            }
+         }, _marked$2, this);
+       }
 
+       var root = [null];
+       function Selection(groups, parents) {
+         this._groups = groups;
+         this._parents = parents;
+       }
 
-           projection.invert = function(point) {
-               point = project.invert((point[0] - x) / k, (y - point[1]) / k);
-               return point && [point[0] * 180 / Math.PI, point[1] * 180 / Math.PI];
-           };
+       function selection() {
+         return new Selection([[document.documentElement]], root);
+       }
 
+       function selection_selection() {
+         return this;
+       }
 
-           projection.scale = function(_) {
-               if (!arguments.length) return k;
-               k = +_;
-               return projection;
-           };
+       Selection.prototype = selection.prototype = _defineProperty({
+         constructor: Selection,
+         select: selection_select,
+         selectAll: selection_selectAll,
+         selectChild: selection_selectChild,
+         selectChildren: selection_selectChildren,
+         filter: selection_filter,
+         data: selection_data,
+         enter: selection_enter,
+         exit: selection_exit,
+         join: selection_join,
+         merge: selection_merge,
+         selection: selection_selection,
+         order: selection_order,
+         sort: selection_sort,
+         call: selection_call,
+         nodes: selection_nodes,
+         node: selection_node,
+         size: selection_size,
+         empty: selection_empty,
+         each: selection_each,
+         attr: selection_attr,
+         style: selection_style,
+         property: selection_property,
+         classed: selection_classed,
+         text: selection_text,
+         html: selection_html,
+         raise: selection_raise,
+         lower: selection_lower,
+         append: selection_append,
+         insert: selection_insert,
+         remove: selection_remove,
+         clone: selection_clone,
+         datum: selection_datum,
+         on: selection_on,
+         dispatch: selection_dispatch
+       }, Symbol.iterator, _callee);
 
+       function select (selector) {
+         return typeof selector === "string" ? new Selection([[document.querySelector(selector)]], [document.documentElement]) : new Selection([[selector]], root);
+       }
 
-           projection.translate = function(_) {
-               if (!arguments.length) return [x, y];
-               x = +_[0];
-               y = +_[1];
-               return projection;
-           };
+       function sourceEvent (event) {
+         var sourceEvent;
 
+         while (sourceEvent = event.sourceEvent) {
+           event = sourceEvent;
+         }
 
-           projection.clipExtent = function(_) {
-               if (!arguments.length) return clipExtent;
-               clipExtent = _;
-               return projection;
-           };
+         return event;
+       }
 
+       function pointer (event, node) {
+         event = sourceEvent(event);
+         if (node === undefined) node = event.currentTarget;
 
-           projection.transform = function(obj) {
-               if (!arguments.length) return identity$2.translate(x, y).scale(k);
-               x = +obj.x;
-               y = +obj.y;
-               k = +obj.k;
-               return projection;
-           };
+         if (node) {
+           var svg = node.ownerSVGElement || node;
 
+           if (svg.createSVGPoint) {
+             var point = svg.createSVGPoint();
+             point.x = event.clientX, point.y = event.clientY;
+             point = point.matrixTransform(node.getScreenCTM().inverse());
+             return [point.x, point.y];
+           }
 
-           projection.stream = d3_geoTransform({
-               point: function(x, y) {
-                   var vec = projection([x, y]);
-                   this.stream.point(vec[0], vec[1]);
-               }
-           }).stream;
+           if (node.getBoundingClientRect) {
+             var rect = node.getBoundingClientRect();
+             return [event.clientX - rect.left - node.clientLeft, event.clientY - rect.top - node.clientTop];
+           }
+         }
 
+         return [event.pageX, event.pageY];
+       }
 
-           return projection;
+       function selectAll (selector) {
+         return typeof selector === "string" ? new Selection([document.querySelectorAll(selector)], [document.documentElement]) : new Selection([selector == null ? [] : array(selector)], root);
        }
 
-       function geoOrthoNormalizedDotProduct(a, b, origin) {
-           if (geoVecEqual(origin, a) || geoVecEqual(origin, b)) {
-               return 1;  // coincident points, treat as straight and try to remove
-           }
-           return geoVecNormalizedDot(a, b, origin);
+       function nopropagation(event) {
+         event.stopImmediatePropagation();
+       }
+       function noevent (event) {
+         event.preventDefault();
+         event.stopImmediatePropagation();
        }
 
+       function dragDisable (view) {
+         var root = view.document.documentElement,
+             selection = select(view).on("dragstart.drag", noevent, true);
 
-       function geoOrthoFilterDotProduct(dotp, epsilon, lowerThreshold, upperThreshold, allowStraightAngles) {
-           var val = Math.abs(dotp);
-           if (val < epsilon) {
-               return 0;      // already orthogonal
-           } else if (allowStraightAngles && Math.abs(val-1) < epsilon) {
-               return 0;      // straight angle, which is okay in this case
-           } else if (val < lowerThreshold || val > upperThreshold) {
-               return dotp;   // can be adjusted
-           } else {
-               return null;   // ignore vertex
-           }
+         if ("onselectstart" in root) {
+           selection.on("selectstart.drag", noevent, true);
+         } else {
+           root.__noselect = root.style.MozUserSelect;
+           root.style.MozUserSelect = "none";
+         }
        }
+       function yesdrag(view, noclick) {
+         var root = view.document.documentElement,
+             selection = select(view).on("dragstart.drag", null);
 
+         if (noclick) {
+           selection.on("click.drag", noevent, true);
+           setTimeout(function () {
+             selection.on("click.drag", null);
+           }, 0);
+         }
 
-       function geoOrthoCalcScore(points, isClosed, epsilon, threshold) {
-           var score = 0;
-           var first = isClosed ? 0 : 1;
-           var last = isClosed ? points.length : points.length - 1;
-           var coords = points.map(function(p) { return p.coord; });
+         if ("onselectstart" in root) {
+           selection.on("selectstart.drag", null);
+         } else {
+           root.style.MozUserSelect = root.__noselect;
+           delete root.__noselect;
+         }
+       }
 
-           var lowerThreshold = Math.cos((90 - threshold) * Math.PI / 180);
-           var upperThreshold = Math.cos(threshold * Math.PI / 180);
+       var constant$1 = (function (x) {
+         return function () {
+           return x;
+         };
+       });
 
-           for (var i = first; i < last; i++) {
-               var a = coords[(i - 1 + coords.length) % coords.length];
-               var origin = coords[i];
-               var b = coords[(i + 1) % coords.length];
+       // `Object.defineProperties` method
+       // https://tc39.github.io/ecma262/#sec-object.defineproperties
+       _export({ target: 'Object', stat: true, forced: !descriptors, sham: !descriptors }, {
+         defineProperties: objectDefineProperties
+       });
 
-               var dotp = geoOrthoFilterDotProduct(geoOrthoNormalizedDotProduct(a, b, origin), epsilon, lowerThreshold, upperThreshold);
-               if (dotp === null) continue;    // ignore vertex
-               score = score + 2.0 * Math.min(Math.abs(dotp - 1.0), Math.min(Math.abs(dotp), Math.abs(dotp + 1)));
+       function DragEvent(type, _ref) {
+         var sourceEvent = _ref.sourceEvent,
+             subject = _ref.subject,
+             target = _ref.target,
+             identifier = _ref.identifier,
+             active = _ref.active,
+             x = _ref.x,
+             y = _ref.y,
+             dx = _ref.dx,
+             dy = _ref.dy,
+             dispatch = _ref.dispatch;
+         Object.defineProperties(this, {
+           type: {
+             value: type,
+             enumerable: true,
+             configurable: true
+           },
+           sourceEvent: {
+             value: sourceEvent,
+             enumerable: true,
+             configurable: true
+           },
+           subject: {
+             value: subject,
+             enumerable: true,
+             configurable: true
+           },
+           target: {
+             value: target,
+             enumerable: true,
+             configurable: true
+           },
+           identifier: {
+             value: identifier,
+             enumerable: true,
+             configurable: true
+           },
+           active: {
+             value: active,
+             enumerable: true,
+             configurable: true
+           },
+           x: {
+             value: x,
+             enumerable: true,
+             configurable: true
+           },
+           y: {
+             value: y,
+             enumerable: true,
+             configurable: true
+           },
+           dx: {
+             value: dx,
+             enumerable: true,
+             configurable: true
+           },
+           dy: {
+             value: dy,
+             enumerable: true,
+             configurable: true
+           },
+           _: {
+             value: dispatch
            }
+         });
+       }
 
-           return score;
+       DragEvent.prototype.on = function () {
+         var value = this._.on.apply(this._, arguments);
+
+         return value === this._ ? this : value;
+       };
+
+       function defaultFilter(event) {
+         return !event.ctrlKey && !event.button;
        }
 
-       // returns the maximum angle less than `lessThan` between the actual corner and a 0° or 90° corner
-       function geoOrthoMaxOffsetAngle(coords, isClosed, lessThan) {
-           var max = -Infinity;
+       function defaultContainer() {
+         return this.parentNode;
+       }
 
-           var first = isClosed ? 0 : 1;
-           var last = isClosed ? coords.length : coords.length - 1;
+       function defaultSubject(event, d) {
+         return d == null ? {
+           x: event.x,
+           y: event.y
+         } : d;
+       }
 
-           for (var i = first; i < last; i++) {
-               var a = coords[(i - 1 + coords.length) % coords.length];
-               var origin = coords[i];
-               var b = coords[(i + 1) % coords.length];
-               var normalizedDotP = geoOrthoNormalizedDotProduct(a, b, origin);
+       function defaultTouchable() {
+         return navigator.maxTouchPoints || "ontouchstart" in this;
+       }
 
-               var angle = Math.acos(Math.abs(normalizedDotP)) * 180 / Math.PI;
+       function d3_drag () {
+         var filter = defaultFilter,
+             container = defaultContainer,
+             subject = defaultSubject,
+             touchable = defaultTouchable,
+             gestures = {},
+             listeners = dispatch("start", "drag", "end"),
+             active = 0,
+             mousedownx,
+             mousedowny,
+             mousemoving,
+             touchending,
+             clickDistance2 = 0;
 
-               if (angle > 45) angle = 90 - angle;
+         function drag(selection) {
+           selection.on("mousedown.drag", mousedowned).filter(touchable).on("touchstart.drag", touchstarted).on("touchmove.drag", touchmoved).on("touchend.drag touchcancel.drag", touchended).style("touch-action", "none").style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
+         }
+
+         function mousedowned(event, d) {
+           if (touchending || !filter.call(this, event, d)) return;
+           var gesture = beforestart(this, container.call(this, event, d), event, d, "mouse");
+           if (!gesture) return;
+           select(event.view).on("mousemove.drag", mousemoved, true).on("mouseup.drag", mouseupped, true);
+           dragDisable(event.view);
+           nopropagation(event);
+           mousemoving = false;
+           mousedownx = event.clientX;
+           mousedowny = event.clientY;
+           gesture("start", event);
+         }
 
-               if (angle >= lessThan) continue;
+         function mousemoved(event) {
+           noevent(event);
 
-               if (angle > max) max = angle;
+           if (!mousemoving) {
+             var dx = event.clientX - mousedownx,
+                 dy = event.clientY - mousedowny;
+             mousemoving = dx * dx + dy * dy > clickDistance2;
            }
 
-           if (max === -Infinity) return null;
-
-           return max;
-       }
+           gestures.mouse("drag", event);
+         }
 
+         function mouseupped(event) {
+           select(event.view).on("mousemove.drag mouseup.drag", null);
+           yesdrag(event.view, mousemoving);
+           noevent(event);
+           gestures.mouse("end", event);
+         }
 
-       // similar to geoOrthoCalcScore, but returns quickly if there is something to do
-       function geoOrthoCanOrthogonalize(coords, isClosed, epsilon, threshold, allowStraightAngles) {
-           var score = null;
-           var first = isClosed ? 0 : 1;
-           var last = isClosed ? coords.length : coords.length - 1;
+         function touchstarted(event, d) {
+           if (!filter.call(this, event, d)) return;
+           var touches = event.changedTouches,
+               c = container.call(this, event, d),
+               n = touches.length,
+               i,
+               gesture;
 
-           var lowerThreshold = Math.cos((90 - threshold) * Math.PI / 180);
-           var upperThreshold = Math.cos(threshold * Math.PI / 180);
+           for (i = 0; i < n; ++i) {
+             if (gesture = beforestart(this, c, event, d, touches[i].identifier, touches[i])) {
+               nopropagation(event);
+               gesture("start", event, touches[i]);
+             }
+           }
+         }
 
-           for (var i = first; i < last; i++) {
-               var a = coords[(i - 1 + coords.length) % coords.length];
-               var origin = coords[i];
-               var b = coords[(i + 1) % coords.length];
+         function touchmoved(event) {
+           var touches = event.changedTouches,
+               n = touches.length,
+               i,
+               gesture;
 
-               var dotp = geoOrthoFilterDotProduct(geoOrthoNormalizedDotProduct(a, b, origin), epsilon, lowerThreshold, upperThreshold, allowStraightAngles);
-               if (dotp === null) continue;        // ignore vertex
-               if (Math.abs(dotp) > 0) return 1;   // something to do
-               score = 0;                          // already square
+           for (i = 0; i < n; ++i) {
+             if (gesture = gestures[touches[i].identifier]) {
+               noevent(event);
+               gesture("drag", event, touches[i]);
+             }
            }
+         }
 
-           return score;
-       }
+         function touchended(event) {
+           var touches = event.changedTouches,
+               n = touches.length,
+               i,
+               gesture;
+           if (touchending) clearTimeout(touchending);
+           touchending = setTimeout(function () {
+             touchending = null;
+           }, 500); // Ghost clicks are delayed!
 
-       // Returns true if a and b have the same elements at the same indices.
-       function utilArrayIdentical(a, b) {
-           // an array is always identical to itself
-           if (a === b) return true;
+           for (i = 0; i < n; ++i) {
+             if (gesture = gestures[touches[i].identifier]) {
+               nopropagation(event);
+               gesture("end", event, touches[i]);
+             }
+           }
+         }
+
+         function beforestart(that, container, event, d, identifier, touch) {
+           var dispatch = listeners.copy(),
+               p = pointer(touch || event, container),
+               dx,
+               dy,
+               s;
+           if ((s = subject.call(that, new DragEvent("beforestart", {
+             sourceEvent: event,
+             target: drag,
+             identifier: identifier,
+             active: active,
+             x: p[0],
+             y: p[1],
+             dx: 0,
+             dy: 0,
+             dispatch: dispatch
+           }), d)) == null) return;
+           dx = s.x - p[0] || 0;
+           dy = s.y - p[1] || 0;
+           return function gesture(type, event, touch) {
+             var p0 = p,
+                 n;
 
-           var i = a.length;
-           if (i !== b.length) return false;
-           while (i--) {
-               if (a[i] !== b[i]) return false;
-           }
-           return true;
-       }
+             switch (type) {
+               case "start":
+                 gestures[identifier] = gesture, n = active++;
+                 break;
 
-       // http://2ality.com/2015/01/es6-set-operations.html
+               case "end":
+                 delete gestures[identifier], --active;
+               // nobreak
 
-       // Difference (a \ b): create a set that contains those elements of set a that are not in set b.
-       // This operation is also sometimes called minus (-).
-       // var a = [1,2,3];
-       // var b = [4,3,2];
-       // utilArrayDifference(a, b)
-       //   [1]
-       // utilArrayDifference(b, a)
-       //   [4]
-       function utilArrayDifference(a, b) {
-           var other = new Set(b);
-           return Array.from(new Set(a))
-               .filter(function(v) { return !other.has(v); });
-       }
+               case "drag":
+                 p = pointer(touch || event, container), n = active;
+                 break;
+             }
 
-       // Intersection (a ∩ b): create a set that contains those elements of set a that are also in set b.
-       // var a = [1,2,3];
-       // var b = [4,3,2];
-       // utilArrayIntersection(a, b)
-       //   [2,3]
-       function utilArrayIntersection(a, b) {
-           var other = new Set(b);
-           return Array.from(new Set(a))
-               .filter(function(v) { return other.has(v); });
-       }
+             dispatch.call(type, that, new DragEvent(type, {
+               sourceEvent: event,
+               subject: s,
+               target: drag,
+               identifier: identifier,
+               active: n,
+               x: p[0] + dx,
+               y: p[1] + dy,
+               dx: p[0] - p0[0],
+               dy: p[1] - p0[1],
+               dispatch: dispatch
+             }), d);
+           };
+         }
 
-       // Union (a ∪ b): create a set that contains the elements of both set a and set b.
-       // var a = [1,2,3];
-       // var b = [4,3,2];
-       // utilArrayUnion(a, b)
-       //   [1,2,3,4]
-       function utilArrayUnion(a, b) {
-           var result = new Set(a);
-           b.forEach(function(v) { result.add(v); });
-           return Array.from(result);
-       }
+         drag.filter = function (_) {
+           return arguments.length ? (filter = typeof _ === "function" ? _ : constant$1(!!_), drag) : filter;
+         };
 
-       // Returns an Array with all the duplicates removed
-       // var a = [1,1,2,3,3];
-       // utilArrayUniq(a)
-       //   [1,2,3]
-       function utilArrayUniq(a) {
-           return Array.from(new Set(a));
+         drag.container = function (_) {
+           return arguments.length ? (container = typeof _ === "function" ? _ : constant$1(_), drag) : container;
+         };
+
+         drag.subject = function (_) {
+           return arguments.length ? (subject = typeof _ === "function" ? _ : constant$1(_), drag) : subject;
+         };
+
+         drag.touchable = function (_) {
+           return arguments.length ? (touchable = typeof _ === "function" ? _ : constant$1(!!_), drag) : touchable;
+         };
+
+         drag.on = function () {
+           var value = listeners.on.apply(listeners, arguments);
+           return value === listeners ? drag : value;
+         };
+
+         drag.clickDistance = function (_) {
+           return arguments.length ? (clickDistance2 = (_ = +_) * _, drag) : Math.sqrt(clickDistance2);
+         };
+
+         return drag;
        }
 
+       var defineProperty$9 = objectDefineProperty.f;
+       var getOwnPropertyNames$1 = objectGetOwnPropertyNames.f;
 
-       // Splits array into chunks of given chunk size
-       // var a = [1,2,3,4,5,6,7];
-       // utilArrayChunk(a, 3);
-       //   [[1,2,3],[4,5,6],[7]];
-       function utilArrayChunk(a, chunkSize) {
-           if (!chunkSize || chunkSize < 0) return [a.slice()];
 
-           var result = new Array(Math.ceil(a.length / chunkSize));
-           return Array.from(result, function(item, i) {
-               return a.slice(i * chunkSize, i * chunkSize + chunkSize);
+
+
+
+       var setInternalState$8 = internalState.set;
+
+
+
+       var MATCH$1 = wellKnownSymbol('match');
+       var NativeRegExp = global_1.RegExp;
+       var RegExpPrototype$1 = NativeRegExp.prototype;
+       var re1 = /a/g;
+       var re2 = /a/g;
+
+       // "new" should create a new object, old webkit bug
+       var CORRECT_NEW = new NativeRegExp(re1) !== re1;
+
+       var UNSUPPORTED_Y$2 = regexpStickyHelpers.UNSUPPORTED_Y;
+
+       var FORCED$b = descriptors && isForced_1('RegExp', (!CORRECT_NEW || UNSUPPORTED_Y$2 || fails(function () {
+         re2[MATCH$1] = false;
+         // RegExp constructor can alter flags and IsRegExp works correct with @@match
+         return NativeRegExp(re1) != re1 || NativeRegExp(re2) == re2 || NativeRegExp(re1, 'i') != '/a/i';
+       })));
+
+       // `RegExp` constructor
+       // https://tc39.github.io/ecma262/#sec-regexp-constructor
+       if (FORCED$b) {
+         var RegExpWrapper = function RegExp(pattern, flags) {
+           var thisIsRegExp = this instanceof RegExpWrapper;
+           var patternIsRegExp = isRegexp(pattern);
+           var flagsAreUndefined = flags === undefined;
+           var sticky;
+
+           if (!thisIsRegExp && patternIsRegExp && pattern.constructor === RegExpWrapper && flagsAreUndefined) {
+             return pattern;
+           }
+
+           if (CORRECT_NEW) {
+             if (patternIsRegExp && !flagsAreUndefined) pattern = pattern.source;
+           } else if (pattern instanceof RegExpWrapper) {
+             if (flagsAreUndefined) flags = regexpFlags.call(pattern);
+             pattern = pattern.source;
+           }
+
+           if (UNSUPPORTED_Y$2) {
+             sticky = !!flags && flags.indexOf('y') > -1;
+             if (sticky) flags = flags.replace(/y/g, '');
+           }
+
+           var result = inheritIfRequired(
+             CORRECT_NEW ? new NativeRegExp(pattern, flags) : NativeRegExp(pattern, flags),
+             thisIsRegExp ? this : RegExpPrototype$1,
+             RegExpWrapper
+           );
+
+           if (UNSUPPORTED_Y$2 && sticky) setInternalState$8(result, { sticky: sticky });
+
+           return result;
+         };
+         var proxy = function (key) {
+           key in RegExpWrapper || defineProperty$9(RegExpWrapper, key, {
+             configurable: true,
+             get: function () { return NativeRegExp[key]; },
+             set: function (it) { NativeRegExp[key] = it; }
            });
+         };
+         var keys$2 = getOwnPropertyNames$1(NativeRegExp);
+         var index = 0;
+         while (keys$2.length > index) proxy(keys$2[index++]);
+         RegExpPrototype$1.constructor = RegExpWrapper;
+         RegExpWrapper.prototype = RegExpPrototype$1;
+         redefine(global_1, 'RegExp', RegExpWrapper);
        }
 
+       // https://tc39.github.io/ecma262/#sec-get-regexp-@@species
+       setSpecies('RegExp');
 
-       // Flattens two level array into a single level
-       // var a = [[1,2,3],[4,5,6],[7]];
-       // utilArrayFlatten(a);
-       //   [1,2,3,4,5,6,7];
-       function utilArrayFlatten(a) {
-           return a.reduce(function(acc, val) {
-               return acc.concat(val);
-           }, []);
+       function define (constructor, factory, prototype) {
+         constructor.prototype = factory.prototype = prototype;
+         prototype.constructor = constructor;
        }
+       function extend(parent, definition) {
+         var prototype = Object.create(parent.prototype);
 
+         for (var key in definition) {
+           prototype[key] = definition[key];
+         }
 
-       // Groups the items of the Array according to the given key
-       // `key` can be passed as a property or as a key function
-       //
-       // var pets = [
-       //     { type: 'Dog', name: 'Spot' },
-       //     { type: 'Cat', name: 'Tiger' },
-       //     { type: 'Dog', name: 'Rover' },
-       //     { type: 'Cat', name: 'Leo' }
-       // ];
-       //
-       // utilArrayGroupBy(pets, 'type')
-       //   {
-       //     'Dog': [{type: 'Dog', name: 'Spot'}, {type: 'Dog', name: 'Rover'}],
-       //     'Cat': [{type: 'Cat', name: 'Tiger'}, {type: 'Cat', name: 'Leo'}]
-       //   }
-       //
-       // utilArrayGroupBy(pets, function(item) { return item.name.length; })
-       //   {
-       //     3: [{type: 'Cat', name: 'Leo'}],
-       //     4: [{type: 'Dog', name: 'Spot'}],
-       //     5: [{type: 'Cat', name: 'Tiger'}, {type: 'Dog', name: 'Rover'}]
-       //   }
-       function utilArrayGroupBy(a, key) {
-           return a.reduce(function(acc, item) {
-               var group = (typeof key === 'function') ? key(item) : item[key];
-               (acc[group] = acc[group] || []).push(item);
-               return acc;
-           }, {});
+         return prototype;
        }
 
+       function Color() {}
+       var _darker = 0.7;
 
-       // Returns an Array with all the duplicates removed
-       // where uniqueness determined by the given key
-       // `key` can be passed as a property or as a key function
-       //
-       // var pets = [
-       //     { type: 'Dog', name: 'Spot' },
-       //     { type: 'Cat', name: 'Tiger' },
-       //     { type: 'Dog', name: 'Rover' },
-       //     { type: 'Cat', name: 'Leo' }
-       // ];
-       //
-       // utilArrayUniqBy(pets, 'type')
-       //   [
-       //     { type: 'Dog', name: 'Spot' },
-       //     { type: 'Cat', name: 'Tiger' }
-       //   ]
-       //
-       // utilArrayUniqBy(pets, function(item) { return item.name.length; })
-       //   [
-       //     { type: 'Dog', name: 'Spot' },
-       //     { type: 'Cat', name: 'Tiger' },
-       //     { type: 'Cat', name: 'Leo' }
-       //   }
-       function utilArrayUniqBy(a, key) {
-           var seen = new Set();
-           return a.reduce(function(acc, item) {
-               var val = (typeof key === 'function') ? key(item) : item[key];
-               if (val && !seen.has(val)) {
-                   seen.add(val);
-                   acc.push(item);
-               }
-               return acc;
-           }, []);
+       var _brighter = 1 / _darker;
+       var reI = "\\s*([+-]?\\d+)\\s*",
+           reN = "\\s*([+-]?\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)\\s*",
+           reP = "\\s*([+-]?\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)%\\s*",
+           reHex = /^#([0-9a-f]{3,8})$/,
+           reRgbInteger = new RegExp("^rgb\\(" + [reI, reI, reI] + "\\)$"),
+           reRgbPercent = new RegExp("^rgb\\(" + [reP, reP, reP] + "\\)$"),
+           reRgbaInteger = new RegExp("^rgba\\(" + [reI, reI, reI, reN] + "\\)$"),
+           reRgbaPercent = new RegExp("^rgba\\(" + [reP, reP, reP, reN] + "\\)$"),
+           reHslPercent = new RegExp("^hsl\\(" + [reN, reP, reP] + "\\)$"),
+           reHslaPercent = new RegExp("^hsla\\(" + [reN, reP, reP, reN] + "\\)$");
+       var named = {
+         aliceblue: 0xf0f8ff,
+         antiquewhite: 0xfaebd7,
+         aqua: 0x00ffff,
+         aquamarine: 0x7fffd4,
+         azure: 0xf0ffff,
+         beige: 0xf5f5dc,
+         bisque: 0xffe4c4,
+         black: 0x000000,
+         blanchedalmond: 0xffebcd,
+         blue: 0x0000ff,
+         blueviolet: 0x8a2be2,
+         brown: 0xa52a2a,
+         burlywood: 0xdeb887,
+         cadetblue: 0x5f9ea0,
+         chartreuse: 0x7fff00,
+         chocolate: 0xd2691e,
+         coral: 0xff7f50,
+         cornflowerblue: 0x6495ed,
+         cornsilk: 0xfff8dc,
+         crimson: 0xdc143c,
+         cyan: 0x00ffff,
+         darkblue: 0x00008b,
+         darkcyan: 0x008b8b,
+         darkgoldenrod: 0xb8860b,
+         darkgray: 0xa9a9a9,
+         darkgreen: 0x006400,
+         darkgrey: 0xa9a9a9,
+         darkkhaki: 0xbdb76b,
+         darkmagenta: 0x8b008b,
+         darkolivegreen: 0x556b2f,
+         darkorange: 0xff8c00,
+         darkorchid: 0x9932cc,
+         darkred: 0x8b0000,
+         darksalmon: 0xe9967a,
+         darkseagreen: 0x8fbc8f,
+         darkslateblue: 0x483d8b,
+         darkslategray: 0x2f4f4f,
+         darkslategrey: 0x2f4f4f,
+         darkturquoise: 0x00ced1,
+         darkviolet: 0x9400d3,
+         deeppink: 0xff1493,
+         deepskyblue: 0x00bfff,
+         dimgray: 0x696969,
+         dimgrey: 0x696969,
+         dodgerblue: 0x1e90ff,
+         firebrick: 0xb22222,
+         floralwhite: 0xfffaf0,
+         forestgreen: 0x228b22,
+         fuchsia: 0xff00ff,
+         gainsboro: 0xdcdcdc,
+         ghostwhite: 0xf8f8ff,
+         gold: 0xffd700,
+         goldenrod: 0xdaa520,
+         gray: 0x808080,
+         green: 0x008000,
+         greenyellow: 0xadff2f,
+         grey: 0x808080,
+         honeydew: 0xf0fff0,
+         hotpink: 0xff69b4,
+         indianred: 0xcd5c5c,
+         indigo: 0x4b0082,
+         ivory: 0xfffff0,
+         khaki: 0xf0e68c,
+         lavender: 0xe6e6fa,
+         lavenderblush: 0xfff0f5,
+         lawngreen: 0x7cfc00,
+         lemonchiffon: 0xfffacd,
+         lightblue: 0xadd8e6,
+         lightcoral: 0xf08080,
+         lightcyan: 0xe0ffff,
+         lightgoldenrodyellow: 0xfafad2,
+         lightgray: 0xd3d3d3,
+         lightgreen: 0x90ee90,
+         lightgrey: 0xd3d3d3,
+         lightpink: 0xffb6c1,
+         lightsalmon: 0xffa07a,
+         lightseagreen: 0x20b2aa,
+         lightskyblue: 0x87cefa,
+         lightslategray: 0x778899,
+         lightslategrey: 0x778899,
+         lightsteelblue: 0xb0c4de,
+         lightyellow: 0xffffe0,
+         lime: 0x00ff00,
+         limegreen: 0x32cd32,
+         linen: 0xfaf0e6,
+         magenta: 0xff00ff,
+         maroon: 0x800000,
+         mediumaquamarine: 0x66cdaa,
+         mediumblue: 0x0000cd,
+         mediumorchid: 0xba55d3,
+         mediumpurple: 0x9370db,
+         mediumseagreen: 0x3cb371,
+         mediumslateblue: 0x7b68ee,
+         mediumspringgreen: 0x00fa9a,
+         mediumturquoise: 0x48d1cc,
+         mediumvioletred: 0xc71585,
+         midnightblue: 0x191970,
+         mintcream: 0xf5fffa,
+         mistyrose: 0xffe4e1,
+         moccasin: 0xffe4b5,
+         navajowhite: 0xffdead,
+         navy: 0x000080,
+         oldlace: 0xfdf5e6,
+         olive: 0x808000,
+         olivedrab: 0x6b8e23,
+         orange: 0xffa500,
+         orangered: 0xff4500,
+         orchid: 0xda70d6,
+         palegoldenrod: 0xeee8aa,
+         palegreen: 0x98fb98,
+         paleturquoise: 0xafeeee,
+         palevioletred: 0xdb7093,
+         papayawhip: 0xffefd5,
+         peachpuff: 0xffdab9,
+         peru: 0xcd853f,
+         pink: 0xffc0cb,
+         plum: 0xdda0dd,
+         powderblue: 0xb0e0e6,
+         purple: 0x800080,
+         rebeccapurple: 0x663399,
+         red: 0xff0000,
+         rosybrown: 0xbc8f8f,
+         royalblue: 0x4169e1,
+         saddlebrown: 0x8b4513,
+         salmon: 0xfa8072,
+         sandybrown: 0xf4a460,
+         seagreen: 0x2e8b57,
+         seashell: 0xfff5ee,
+         sienna: 0xa0522d,
+         silver: 0xc0c0c0,
+         skyblue: 0x87ceeb,
+         slateblue: 0x6a5acd,
+         slategray: 0x708090,
+         slategrey: 0x708090,
+         snow: 0xfffafa,
+         springgreen: 0x00ff7f,
+         steelblue: 0x4682b4,
+         tan: 0xd2b48c,
+         teal: 0x008080,
+         thistle: 0xd8bfd8,
+         tomato: 0xff6347,
+         turquoise: 0x40e0d0,
+         violet: 0xee82ee,
+         wheat: 0xf5deb3,
+         white: 0xffffff,
+         whitesmoke: 0xf5f5f5,
+         yellow: 0xffff00,
+         yellowgreen: 0x9acd32
+       };
+       define(Color, color, {
+         copy: function copy(channels) {
+           return Object.assign(new this.constructor(), this, channels);
+         },
+         displayable: function displayable() {
+           return this.rgb().displayable();
+         },
+         hex: color_formatHex,
+         // Deprecated! Use color.formatHex.
+         formatHex: color_formatHex,
+         formatHsl: color_formatHsl,
+         formatRgb: color_formatRgb,
+         toString: color_formatRgb
+       });
+
+       function color_formatHex() {
+         return this.rgb().formatHex();
        }
 
-       var remove$1 = removeDiacritics;
+       function color_formatHsl() {
+         return hslConvert(this).formatHsl();
+       }
 
-       var replacementList = [
-         {
-           base: ' ',
-           chars: "\u00A0",
-         }, {
-           base: '0',
-           chars: "\u07C0",
-         }, {
-           base: 'A',
-           chars: "\u24B6\uFF21\u00C0\u00C1\u00C2\u1EA6\u1EA4\u1EAA\u1EA8\u00C3\u0100\u0102\u1EB0\u1EAE\u1EB4\u1EB2\u0226\u01E0\u00C4\u01DE\u1EA2\u00C5\u01FA\u01CD\u0200\u0202\u1EA0\u1EAC\u1EB6\u1E00\u0104\u023A\u2C6F",
-         }, {
-           base: 'AA',
-           chars: "\uA732",
-         }, {
-           base: 'AE',
-           chars: "\u00C6\u01FC\u01E2",
-         }, {
-           base: 'AO',
-           chars: "\uA734",
-         }, {
-           base: 'AU',
-           chars: "\uA736",
-         }, {
-           base: 'AV',
-           chars: "\uA738\uA73A",
-         }, {
-           base: 'AY',
-           chars: "\uA73C",
-         }, {
-           base: 'B',
-           chars: "\u24B7\uFF22\u1E02\u1E04\u1E06\u0243\u0181",
-         }, {
-           base: 'C',
-           chars: "\u24b8\uff23\uA73E\u1E08\u0106\u0043\u0108\u010A\u010C\u00C7\u0187\u023B",
-         }, {
-           base: 'D',
-           chars: "\u24B9\uFF24\u1E0A\u010E\u1E0C\u1E10\u1E12\u1E0E\u0110\u018A\u0189\u1D05\uA779",
-         }, {
-           base: 'Dh',
-           chars: "\u00D0",
-         }, {
-           base: 'DZ',
-           chars: "\u01F1\u01C4",
-         }, {
-           base: 'Dz',
-           chars: "\u01F2\u01C5",
-         }, {
-           base: 'E',
-           chars: "\u025B\u24BA\uFF25\u00C8\u00C9\u00CA\u1EC0\u1EBE\u1EC4\u1EC2\u1EBC\u0112\u1E14\u1E16\u0114\u0116\u00CB\u1EBA\u011A\u0204\u0206\u1EB8\u1EC6\u0228\u1E1C\u0118\u1E18\u1E1A\u0190\u018E\u1D07",
-         }, {
-           base: 'F',
-           chars: "\uA77C\u24BB\uFF26\u1E1E\u0191\uA77B",
-         }, {
-           base: 'G',
-           chars: "\u24BC\uFF27\u01F4\u011C\u1E20\u011E\u0120\u01E6\u0122\u01E4\u0193\uA7A0\uA77D\uA77E\u0262",
-         }, {
-           base: 'H',
-           chars: "\u24BD\uFF28\u0124\u1E22\u1E26\u021E\u1E24\u1E28\u1E2A\u0126\u2C67\u2C75\uA78D",
-         }, {
-           base: 'I',
-           chars: "\u24BE\uFF29\xCC\xCD\xCE\u0128\u012A\u012C\u0130\xCF\u1E2E\u1EC8\u01CF\u0208\u020A\u1ECA\u012E\u1E2C\u0197",
-         }, {
-           base: 'J',
-           chars: "\u24BF\uFF2A\u0134\u0248\u0237",
-         }, {
-           base: 'K',
-           chars: "\u24C0\uFF2B\u1E30\u01E8\u1E32\u0136\u1E34\u0198\u2C69\uA740\uA742\uA744\uA7A2",
-         }, {
-           base: 'L',
-           chars: "\u24C1\uFF2C\u013F\u0139\u013D\u1E36\u1E38\u013B\u1E3C\u1E3A\u0141\u023D\u2C62\u2C60\uA748\uA746\uA780",
-         }, {
-           base: 'LJ',
-           chars: "\u01C7",
-         }, {
-           base: 'Lj',
-           chars: "\u01C8",
-         }, {
-           base: 'M',
-           chars: "\u24C2\uFF2D\u1E3E\u1E40\u1E42\u2C6E\u019C\u03FB",
-         }, {
-           base: 'N',
-           chars: "\uA7A4\u0220\u24C3\uFF2E\u01F8\u0143\xD1\u1E44\u0147\u1E46\u0145\u1E4A\u1E48\u019D\uA790\u1D0E",
-         }, {
-           base: 'NJ',
-           chars: "\u01CA",
-         }, {
-           base: 'Nj',
-           chars: "\u01CB",
-         }, {
-           base: 'O',
-           chars: "\u24C4\uFF2F\xD2\xD3\xD4\u1ED2\u1ED0\u1ED6\u1ED4\xD5\u1E4C\u022C\u1E4E\u014C\u1E50\u1E52\u014E\u022E\u0230\xD6\u022A\u1ECE\u0150\u01D1\u020C\u020E\u01A0\u1EDC\u1EDA\u1EE0\u1EDE\u1EE2\u1ECC\u1ED8\u01EA\u01EC\xD8\u01FE\u0186\u019F\uA74A\uA74C",
-         }, {
-           base: 'OE',
-           chars: "\u0152",
-         }, {
-           base: 'OI',
-           chars: "\u01A2",
-         }, {
-           base: 'OO',
-           chars: "\uA74E",
-         }, {
-           base: 'OU',
-           chars: "\u0222",
-         }, {
-           base: 'P',
-           chars: "\u24C5\uFF30\u1E54\u1E56\u01A4\u2C63\uA750\uA752\uA754",
-         }, {
-           base: 'Q',
-           chars: "\u24C6\uFF31\uA756\uA758\u024A",
-         }, {
-           base: 'R',
-           chars: "\u24C7\uFF32\u0154\u1E58\u0158\u0210\u0212\u1E5A\u1E5C\u0156\u1E5E\u024C\u2C64\uA75A\uA7A6\uA782",
-         }, {
-           base: 'S',
-           chars: "\u24C8\uFF33\u1E9E\u015A\u1E64\u015C\u1E60\u0160\u1E66\u1E62\u1E68\u0218\u015E\u2C7E\uA7A8\uA784",
-         }, {
-           base: 'T',
-           chars: "\u24C9\uFF34\u1E6A\u0164\u1E6C\u021A\u0162\u1E70\u1E6E\u0166\u01AC\u01AE\u023E\uA786",
-         }, {
-           base: 'Th',
-           chars: "\u00DE",
-         }, {
-           base: 'TZ',
-           chars: "\uA728",
-         }, {
-           base: 'U',
-           chars: "\u24CA\uFF35\xD9\xDA\xDB\u0168\u1E78\u016A\u1E7A\u016C\xDC\u01DB\u01D7\u01D5\u01D9\u1EE6\u016E\u0170\u01D3\u0214\u0216\u01AF\u1EEA\u1EE8\u1EEE\u1EEC\u1EF0\u1EE4\u1E72\u0172\u1E76\u1E74\u0244",
-         }, {
-           base: 'V',
-           chars: "\u24CB\uFF36\u1E7C\u1E7E\u01B2\uA75E\u0245",
-         }, {
-           base: 'VY',
-           chars: "\uA760",
-         }, {
-           base: 'W',
-           chars: "\u24CC\uFF37\u1E80\u1E82\u0174\u1E86\u1E84\u1E88\u2C72",
-         }, {
-           base: 'X',
-           chars: "\u24CD\uFF38\u1E8A\u1E8C",
-         }, {
-           base: 'Y',
-           chars: "\u24CE\uFF39\u1EF2\xDD\u0176\u1EF8\u0232\u1E8E\u0178\u1EF6\u1EF4\u01B3\u024E\u1EFE",
-         }, {
-           base: 'Z',
-           chars: "\u24CF\uFF3A\u0179\u1E90\u017B\u017D\u1E92\u1E94\u01B5\u0224\u2C7F\u2C6B\uA762",
-         }, {
-           base: 'a',
-           chars: "\u24D0\uFF41\u1E9A\u00E0\u00E1\u00E2\u1EA7\u1EA5\u1EAB\u1EA9\u00E3\u0101\u0103\u1EB1\u1EAF\u1EB5\u1EB3\u0227\u01E1\u00E4\u01DF\u1EA3\u00E5\u01FB\u01CE\u0201\u0203\u1EA1\u1EAD\u1EB7\u1E01\u0105\u2C65\u0250\u0251",
-         }, {
-           base: 'aa',
-           chars: "\uA733",
-         }, {
-           base: 'ae',
-           chars: "\u00E6\u01FD\u01E3",
-         }, {
-           base: 'ao',
-           chars: "\uA735",
-         }, {
-           base: 'au',
-           chars: "\uA737",
-         }, {
-           base: 'av',
-           chars: "\uA739\uA73B",
-         }, {
-           base: 'ay',
-           chars: "\uA73D",
-         }, {
-           base: 'b',
-           chars: "\u24D1\uFF42\u1E03\u1E05\u1E07\u0180\u0183\u0253\u0182",
-         }, {
-           base: 'c',
-           chars: "\uFF43\u24D2\u0107\u0109\u010B\u010D\u00E7\u1E09\u0188\u023C\uA73F\u2184",
-         }, {
-           base: 'd',
-           chars: "\u24D3\uFF44\u1E0B\u010F\u1E0D\u1E11\u1E13\u1E0F\u0111\u018C\u0256\u0257\u018B\u13E7\u0501\uA7AA",
-         }, {
-           base: 'dh',
-           chars: "\u00F0",
-         }, {
-           base: 'dz',
-           chars: "\u01F3\u01C6",
-         }, {
-           base: 'e',
-           chars: "\u24D4\uFF45\u00E8\u00E9\u00EA\u1EC1\u1EBF\u1EC5\u1EC3\u1EBD\u0113\u1E15\u1E17\u0115\u0117\u00EB\u1EBB\u011B\u0205\u0207\u1EB9\u1EC7\u0229\u1E1D\u0119\u1E19\u1E1B\u0247\u01DD",
-         }, {
-           base: 'f',
-           chars: "\u24D5\uFF46\u1E1F\u0192",
-         }, {
-           base: 'ff',
-           chars: "\uFB00",
-         }, {
-           base: 'fi',
-           chars: "\uFB01",
-         }, {
-           base: 'fl',
-           chars: "\uFB02",
-         }, {
-           base: 'ffi',
-           chars: "\uFB03",
-         }, {
-           base: 'ffl',
-           chars: "\uFB04",
-         }, {
-           base: 'g',
-           chars: "\u24D6\uFF47\u01F5\u011D\u1E21\u011F\u0121\u01E7\u0123\u01E5\u0260\uA7A1\uA77F\u1D79",
-         }, {
-           base: 'h',
-           chars: "\u24D7\uFF48\u0125\u1E23\u1E27\u021F\u1E25\u1E29\u1E2B\u1E96\u0127\u2C68\u2C76\u0265",
-         }, {
-           base: 'hv',
-           chars: "\u0195",
-         }, {
-           base: 'i',
-           chars: "\u24D8\uFF49\xEC\xED\xEE\u0129\u012B\u012D\xEF\u1E2F\u1EC9\u01D0\u0209\u020B\u1ECB\u012F\u1E2D\u0268\u0131",
-         }, {
-           base: 'j',
-           chars: "\u24D9\uFF4A\u0135\u01F0\u0249",
-         }, {
-           base: 'k',
-           chars: "\u24DA\uFF4B\u1E31\u01E9\u1E33\u0137\u1E35\u0199\u2C6A\uA741\uA743\uA745\uA7A3",
-         }, {
-           base: 'l',
-           chars: "\u24DB\uFF4C\u0140\u013A\u013E\u1E37\u1E39\u013C\u1E3D\u1E3B\u017F\u0142\u019A\u026B\u2C61\uA749\uA781\uA747\u026D",
-         }, {
-           base: 'lj',
-           chars: "\u01C9",
-         }, {
-           base: 'm',
-           chars: "\u24DC\uFF4D\u1E3F\u1E41\u1E43\u0271\u026F",
-         }, {
-           base: 'n',
-           chars: "\u24DD\uFF4E\u01F9\u0144\xF1\u1E45\u0148\u1E47\u0146\u1E4B\u1E49\u019E\u0272\u0149\uA791\uA7A5\u043B\u0509",
-         }, {
-           base: 'nj',
-           chars: "\u01CC",
-         }, {
-           base: 'o',
-           chars: "\u24DE\uFF4F\xF2\xF3\xF4\u1ED3\u1ED1\u1ED7\u1ED5\xF5\u1E4D\u022D\u1E4F\u014D\u1E51\u1E53\u014F\u022F\u0231\xF6\u022B\u1ECF\u0151\u01D2\u020D\u020F\u01A1\u1EDD\u1EDB\u1EE1\u1EDF\u1EE3\u1ECD\u1ED9\u01EB\u01ED\xF8\u01FF\uA74B\uA74D\u0275\u0254\u1D11",
-         }, {
-           base: 'oe',
-           chars: "\u0153",
-         }, {
-           base: 'oi',
-           chars: "\u01A3",
-         }, {
-           base: 'oo',
-           chars: "\uA74F",
-         }, {
-           base: 'ou',
-           chars: "\u0223",
-         }, {
-           base: 'p',
-           chars: "\u24DF\uFF50\u1E55\u1E57\u01A5\u1D7D\uA751\uA753\uA755\u03C1",
-         }, {
-           base: 'q',
-           chars: "\u24E0\uFF51\u024B\uA757\uA759",
-         }, {
-           base: 'r',
-           chars: "\u24E1\uFF52\u0155\u1E59\u0159\u0211\u0213\u1E5B\u1E5D\u0157\u1E5F\u024D\u027D\uA75B\uA7A7\uA783",
-         }, {
-           base: 's',
-           chars: "\u24E2\uFF53\u015B\u1E65\u015D\u1E61\u0161\u1E67\u1E63\u1E69\u0219\u015F\u023F\uA7A9\uA785\u1E9B\u0282",
-         }, {
-           base: 'ss',
-           chars: "\xDF",
-         }, {
-           base: 't',
-           chars: "\u24E3\uFF54\u1E6B\u1E97\u0165\u1E6D\u021B\u0163\u1E71\u1E6F\u0167\u01AD\u0288\u2C66\uA787",
-         }, {
-           base: 'th',
-           chars: "\u00FE",
-         }, {
-           base: 'tz',
-           chars: "\uA729",
-         }, {
-           base: 'u',
-           chars: "\u24E4\uFF55\xF9\xFA\xFB\u0169\u1E79\u016B\u1E7B\u016D\xFC\u01DC\u01D8\u01D6\u01DA\u1EE7\u016F\u0171\u01D4\u0215\u0217\u01B0\u1EEB\u1EE9\u1EEF\u1EED\u1EF1\u1EE5\u1E73\u0173\u1E77\u1E75\u0289",
-         }, {
-           base: 'v',
-           chars: "\u24E5\uFF56\u1E7D\u1E7F\u028B\uA75F\u028C",
-         }, {
-           base: 'vy',
-           chars: "\uA761",
-         }, {
-           base: 'w',
-           chars: "\u24E6\uFF57\u1E81\u1E83\u0175\u1E87\u1E85\u1E98\u1E89\u2C73",
-         }, {
-           base: 'x',
-           chars: "\u24E7\uFF58\u1E8B\u1E8D",
-         }, {
-           base: 'y',
-           chars: "\u24E8\uFF59\u1EF3\xFD\u0177\u1EF9\u0233\u1E8F\xFF\u1EF7\u1E99\u1EF5\u01B4\u024F\u1EFF",
-         }, {
-           base: 'z',
-           chars: "\u24E9\uFF5A\u017A\u1E91\u017C\u017E\u1E93\u1E95\u01B6\u0225\u0240\u2C6C\uA763",
-         }
-       ];
+       function color_formatRgb() {
+         return this.rgb().formatRgb();
+       }
 
-       var diacriticsMap = {};
-       for (var i$1 = 0; i$1 < replacementList.length; i$1 += 1) {
-         var chars = replacementList[i$1].chars;
-         for (var j = 0; j < chars.length; j += 1) {
-           diacriticsMap[chars[j]] = replacementList[i$1].base;
-         }
+       function color(format) {
+         var m, l;
+         format = (format + "").trim().toLowerCase();
+         return (m = reHex.exec(format)) ? (l = m[1].length, m = parseInt(m[1], 16), l === 6 ? rgbn(m) // #ff0000
+         : l === 3 ? new Rgb(m >> 8 & 0xf | m >> 4 & 0xf0, m >> 4 & 0xf | m & 0xf0, (m & 0xf) << 4 | m & 0xf, 1) // #f00
+         : l === 8 ? rgba(m >> 24 & 0xff, m >> 16 & 0xff, m >> 8 & 0xff, (m & 0xff) / 0xff) // #ff000000
+         : l === 4 ? rgba(m >> 12 & 0xf | m >> 8 & 0xf0, m >> 8 & 0xf | m >> 4 & 0xf0, m >> 4 & 0xf | m & 0xf0, ((m & 0xf) << 4 | m & 0xf) / 0xff) // #f000
+         : null // invalid hex
+         ) : (m = reRgbInteger.exec(format)) ? new Rgb(m[1], m[2], m[3], 1) // rgb(255, 0, 0)
+         : (m = reRgbPercent.exec(format)) ? new Rgb(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, 1) // rgb(100%, 0%, 0%)
+         : (m = reRgbaInteger.exec(format)) ? rgba(m[1], m[2], m[3], m[4]) // rgba(255, 0, 0, 1)
+         : (m = reRgbaPercent.exec(format)) ? rgba(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, m[4]) // rgb(100%, 0%, 0%, 1)
+         : (m = reHslPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, 1) // hsl(120, 50%, 50%)
+         : (m = reHslaPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, m[4]) // hsla(120, 50%, 50%, 1)
+         : named.hasOwnProperty(format) ? rgbn(named[format]) // eslint-disable-line no-prototype-builtins
+         : format === "transparent" ? new Rgb(NaN, NaN, NaN, 0) : null;
        }
 
-       function removeDiacritics(str) {
-         return str.replace(/[^\u0000-\u007e]/g, function(c) {
-           return diacriticsMap[c] || c;
-         });
+       function rgbn(n) {
+         return new Rgb(n >> 16 & 0xff, n >> 8 & 0xff, n & 0xff, 1);
        }
 
-       var replacementList_1 = replacementList;
-       var diacriticsMap_1 = diacriticsMap;
+       function rgba(r, g, b, a) {
+         if (a <= 0) r = g = b = NaN;
+         return new Rgb(r, g, b, a);
+       }
 
-       var diacritics = {
-               remove: remove$1,
-               replacementList: replacementList_1,
-               diacriticsMap: diacriticsMap_1
-       };
+       function rgbConvert(o) {
+         if (!(o instanceof Color)) o = color(o);
+         if (!o) return new Rgb();
+         o = o.rgb();
+         return new Rgb(o.r, o.g, o.b, o.opacity);
+       }
+       function rgb(r, g, b, opacity) {
+         return arguments.length === 1 ? rgbConvert(r) : new Rgb(r, g, b, opacity == null ? 1 : opacity);
+       }
+       function Rgb(r, g, b, opacity) {
+         this.r = +r;
+         this.g = +g;
+         this.b = +b;
+         this.opacity = +opacity;
+       }
+       define(Rgb, rgb, extend(Color, {
+         brighter: function brighter(k) {
+           k = k == null ? _brighter : Math.pow(_brighter, k);
+           return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
+         },
+         darker: function darker(k) {
+           k = k == null ? _darker : Math.pow(_darker, k);
+           return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
+         },
+         rgb: function rgb() {
+           return this;
+         },
+         displayable: function displayable() {
+           return -0.5 <= this.r && this.r < 255.5 && -0.5 <= this.g && this.g < 255.5 && -0.5 <= this.b && this.b < 255.5 && 0 <= this.opacity && this.opacity <= 1;
+         },
+         hex: rgb_formatHex,
+         // Deprecated! Use color.formatHex.
+         formatHex: rgb_formatHex,
+         formatRgb: rgb_formatRgb,
+         toString: rgb_formatRgb
+       }));
 
-       var isArabic_1 = createCommonjsModule(function (module, exports) {
-       Object.defineProperty(exports, "__esModule", { value: true });
-       const arabicBlocks = [
-           [0x0600, 0x06FF],
-           [0x0750, 0x077F],
-           [0x08A0, 0x08FF],
-           [0xFB50, 0xFDFF],
-           [0xFE70, 0xFEFF],
-           [0x10E60, 0x10E7F],
-           [0x1EC70, 0x1ECBF],
-           [0x1EE00, 0x1EEFF] // Mathematical Alphabetic symbols https://www.unicode.org/charts/PDF/U1EE00.pdf
-       ];
-       function isArabic(char) {
-           if (char.length > 1) {
-               // allow the newer chars?
-               throw new Error('isArabic works on only one-character strings');
-           }
-           let code = char.charCodeAt(0);
-           for (let i = 0; i < arabicBlocks.length; i++) {
-               let block = arabicBlocks[i];
-               if (code >= block[0] && code <= block[1]) {
-                   return true;
-               }
-           }
-           return false;
+       function rgb_formatHex() {
+         return "#" + hex$2(this.r) + hex$2(this.g) + hex$2(this.b);
        }
-       exports.isArabic = isArabic;
-       function isMath(char) {
-           if (char.length > 2) {
-               // allow the newer chars?
-               throw new Error('isMath works on only one-character strings');
-           }
-           let code = char.charCodeAt(0);
-           return ((code >= 0x660 && code <= 0x66C) || (code >= 0x6F0 && code <= 0x6F9));
+
+       function rgb_formatRgb() {
+         var a = this.opacity;
+         a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));
+         return (a === 1 ? "rgb(" : "rgba(") + Math.max(0, Math.min(255, Math.round(this.r) || 0)) + ", " + Math.max(0, Math.min(255, Math.round(this.g) || 0)) + ", " + Math.max(0, Math.min(255, Math.round(this.b) || 0)) + (a === 1 ? ")" : ", " + a + ")");
        }
-       exports.isMath = isMath;
-       });
 
-       var unicodeArabic = createCommonjsModule(function (module, exports) {
-       Object.defineProperty(exports, "__esModule", { value: true });
-       const arabicReference = {
-           "alef": {
-               "normal": [
-                   "\u0627"
-               ],
-               "madda_above": {
-                   "normal": [
-                       "\u0627\u0653",
-                       "\u0622"
-                   ],
-                   "isolated": "\uFE81",
-                   "final": "\uFE82"
-               },
-               "hamza_above": {
-                   "normal": [
-                       "\u0627\u0654",
-                       "\u0623"
-                   ],
-                   "isolated": "\uFE83",
-                   "final": "\uFE84"
-               },
-               "hamza_below": {
-                   "normal": [
-                       "\u0627\u0655",
-                       "\u0625"
-                   ],
-                   "isolated": "\uFE87",
-                   "final": "\uFE88"
-               },
-               "wasla": {
-                   "normal": "\u0671",
-                   "isolated": "\uFB50",
-                   "final": "\uFB51"
-               },
-               "wavy_hamza_above": [
-                   "\u0672"
-               ],
-               "wavy_hamza_below": [
-                   "\u0627\u065F",
-                   "\u0673"
-               ],
-               "high_hamza": [
-                   "\u0675",
-                   "\u0627\u0674"
-               ],
-               "indic_two_above": [
-                   "\u0773"
-               ],
-               "indic_three_above": [
-                   "\u0774"
-               ],
-               "fathatan": {
-                   "normal": [
-                       "\u0627\u064B"
-                   ],
-                   "final": "\uFD3C",
-                   "isolated": "\uFD3D"
-               },
-               "isolated": "\uFE8D",
-               "final": "\uFE8E"
-           },
-           "beh": {
-               "normal": [
-                   "\u0628"
-               ],
-               "dotless": [
-                   "\u066E"
-               ],
-               "three_dots_horizontally_below": [
-                   "\u0750"
-               ],
-               "dot_below_three_dots_above": [
-                   "\u0751"
-               ],
-               "three_dots_pointing_upwards_below": [
-                   "\u0752"
-               ],
-               "three_dots_pointing_upwards_below_two_dots_above": [
-                   "\u0753"
-               ],
-               "two_dots_below_dot_above": [
-                   "\u0754"
-               ],
-               "inverted_small_v_below": [
-                   "\u0755"
-               ],
-               "small_v": [
-                   "\u0756"
-               ],
-               "small_v_below": [
-                   "\u08A0"
-               ],
-               "hamza_above": [
-                   "\u08A1"
-               ],
-               "small_meem_above": [
-                   "\u08B6"
-               ],
-               "isolated": "\uFE8F",
-               "final": "\uFE90",
-               "initial": "\uFE91",
-               "medial": "\uFE92"
-           },
-           "teh marbuta": {
-               "normal": [
-                   "\u0629"
-               ],
-               "isolated": "\uFE93",
-               "final": "\uFE94"
-           },
-           "teh": {
-               "normal": [
-                   "\u062A"
-               ],
-               "ring": [
-                   "\u067C"
-               ],
-               "three_dots_above_downwards": [
-                   "\u067D"
-               ],
-               "small_teh_above": [
-                   "\u08B8"
-               ],
-               "isolated": "\uFE95",
-               "final": "\uFE96",
-               "initial": "\uFE97",
-               "medial": "\uFE98"
-           },
-           "theh": {
-               "normal": [
-                   "\u062B"
-               ],
-               "isolated": "\uFE99",
-               "final": "\uFE9A",
-               "initial": "\uFE9B",
-               "medial": "\uFE9C"
-           },
-           "jeem": {
-               "normal": [
-                   "\u062C"
-               ],
-               "two_dots_above": [
-                   "\u08A2"
-               ],
-               "isolated": "\uFE9D",
-               "final": "\uFE9E",
-               "initial": "\uFE9F",
-               "medial": "\uFEA0"
-           },
-           "hah": {
-               "normal": [
-                   "\u062D"
-               ],
-               "hamza_above": [
-                   "\u0681"
-               ],
-               "two_dots_vertical_above": [
-                   "\u0682"
-               ],
-               "three_dots_above": [
-                   "\u0685"
-               ],
-               "two_dots_above": [
-                   "\u0757"
-               ],
-               "three_dots_pointing_upwards_below": [
-                   "\u0758"
-               ],
-               "small_tah_below": [
-                   "\u076E"
-               ],
-               "small_tah_two_dots": [
-                   "\u076F"
-               ],
-               "small_tah_above": [
-                   "\u0772"
-               ],
-               "indic_four_below": [
-                   "\u077C"
-               ],
-               "isolated": "\uFEA1",
-               "final": "\uFEA2",
-               "initial": "\uFEA3",
-               "medial": "\uFEA4"
-           },
-           "khah": {
-               "normal": [
-                   "\u062E"
-               ],
-               "isolated": "\uFEA5",
-               "final": "\uFEA6",
-               "initial": "\uFEA7",
-               "medial": "\uFEA8"
-           },
-           "dal": {
-               "normal": [
-                   "\u062F"
-               ],
-               "ring": [
-                   "\u0689"
-               ],
-               "dot_below": [
-                   "\u068A"
-               ],
-               "dot_below_small_tah": [
-                   "\u068B"
-               ],
-               "three_dots_above_downwards": [
-                   "\u068F"
-               ],
-               "four_dots_above": [
-                   "\u0690"
-               ],
-               "inverted_v": [
-                   "\u06EE"
-               ],
-               "two_dots_vertically_below_small_tah": [
-                   "\u0759"
-               ],
-               "inverted_small_v_below": [
-                   "\u075A"
-               ],
-               "three_dots_below": [
-                   "\u08AE"
-               ],
-               "isolated": "\uFEA9",
-               "final": "\uFEAA"
-           },
-           "thal": {
-               "normal": [
-                   "\u0630"
-               ],
-               "isolated": "\uFEAB",
-               "final": "\uFEAC"
-           },
-           "reh": {
-               "normal": [
-                   "\u0631"
-               ],
-               "small_v": [
-                   "\u0692"
-               ],
-               "ring": [
-                   "\u0693"
-               ],
-               "dot_below": [
-                   "\u0694"
-               ],
-               "small_v_below": [
-                   "\u0695"
-               ],
-               "dot_below_dot_above": [
-                   "\u0696"
-               ],
-               "two_dots_above": [
-                   "\u0697"
-               ],
-               "four_dots_above": [
-                   "\u0699"
-               ],
-               "inverted_v": [
-                   "\u06EF"
-               ],
-               "stroke": [
-                   "\u075B"
-               ],
-               "two_dots_vertically_above": [
-                   "\u076B"
-               ],
-               "hamza_above": [
-                   "\u076C"
-               ],
-               "small_tah_two_dots": [
-                   "\u0771"
-               ],
-               "loop": [
-                   "\u08AA"
-               ],
-               "small_noon_above": [
-                   "\u08B9"
-               ],
-               "isolated": "\uFEAD",
-               "final": "\uFEAE"
-           },
-           "zain": {
-               "normal": [
-                   "\u0632"
-               ],
-               "inverted_v_above": [
-                   "\u08B2"
-               ],
-               "isolated": "\uFEAF",
-               "final": "\uFEB0"
-           },
-           "seen": {
-               "normal": [
-                   "\u0633"
-               ],
-               "dot_below_dot_above": [
-                   "\u069A"
-               ],
-               "three_dots_below": [
-                   "\u069B"
-               ],
-               "three_dots_below_three_dots_above": [
-                   "\u069C"
-               ],
-               "four_dots_above": [
-                   "\u075C"
-               ],
-               "two_dots_vertically_above": [
-                   "\u076D"
-               ],
-               "small_tah_two_dots": [
-                   "\u0770"
-               ],
-               "indic_four_above": [
-                   "\u077D"
-               ],
-               "inverted_v": [
-                   "\u077E"
-               ],
-               "isolated": "\uFEB1",
-               "final": "\uFEB2",
-               "initial": "\uFEB3",
-               "medial": "\uFEB4"
-           },
-           "sheen": {
-               "normal": [
-                   "\u0634"
-               ],
-               "dot_below": [
-                   "\u06FA"
-               ],
-               "isolated": "\uFEB5",
-               "final": "\uFEB6",
-               "initial": "\uFEB7",
-               "medial": "\uFEB8"
-           },
-           "sad": {
-               "normal": [
-                   "\u0635"
-               ],
-               "two_dots_below": [
-                   "\u069D"
-               ],
-               "three_dots_above": [
-                   "\u069E"
-               ],
-               "three_dots_below": [
-                   "\u08AF"
-               ],
-               "isolated": "\uFEB9",
-               "final": "\uFEBA",
-               "initial": "\uFEBB",
-               "medial": "\uFEBC"
-           },
-           "dad": {
-               "normal": [
-                   "\u0636"
-               ],
-               "dot_below": [
-                   "\u06FB"
-               ],
-               "isolated": "\uFEBD",
-               "final": "\uFEBE",
-               "initial": "\uFEBF",
-               "medial": "\uFEC0"
-           },
-           "tah": {
-               "normal": [
-                   "\u0637"
-               ],
-               "three_dots_above": [
-                   "\u069F"
-               ],
-               "two_dots_above": [
-                   "\u08A3"
-               ],
-               "isolated": "\uFEC1",
-               "final": "\uFEC2",
-               "initial": "\uFEC3",
-               "medial": "\uFEC4"
-           },
-           "zah": {
-               "normal": [
-                   "\u0638"
-               ],
-               "isolated": "\uFEC5",
-               "final": "\uFEC6",
-               "initial": "\uFEC7",
-               "medial": "\uFEC8"
-           },
-           "ain": {
-               "normal": [
-                   "\u0639"
-               ],
-               "three_dots_above": [
-                   "\u06A0"
-               ],
-               "two_dots_above": [
-                   "\u075D"
-               ],
-               "three_dots_pointing_downwards_above": [
-                   "\u075E"
-               ],
-               "two_dots_vertically_above": [
-                   "\u075F"
-               ],
-               "three_dots_below": [
-                   "\u08B3"
-               ],
-               "isolated": "\uFEC9",
-               "final": "\uFECA",
-               "initial": "\uFECB",
-               "medial": "\uFECC"
-           },
-           "ghain": {
-               "normal": [
-                   "\u063A"
-               ],
-               "dot_below": [
-                   "\u06FC"
-               ],
-               "isolated": "\uFECD",
-               "final": "\uFECE",
-               "initial": "\uFECF",
-               "medial": "\uFED0"
-           },
-           "feh": {
-               "normal": [
-                   "\u0641"
-               ],
-               "dotless": [
-                   "\u06A1"
-               ],
-               "dot_moved_below": [
-                   "\u06A2"
-               ],
-               "dot_below": [
-                   "\u06A3"
-               ],
-               "three_dots_below": [
-                   "\u06A5"
-               ],
-               "two_dots_below": [
-                   "\u0760"
-               ],
-               "three_dots_pointing_upwards_below": [
-                   "\u0761"
-               ],
-               "dot_below_three_dots_above": [
-                   "\u08A4"
-               ],
-               "isolated": "\uFED1",
-               "final": "\uFED2",
-               "initial": "\uFED3",
-               "medial": "\uFED4"
-           },
-           "qaf": {
-               "normal": [
-                   "\u0642"
-               ],
-               "dotless": [
-                   "\u066F"
-               ],
-               "dot_above": [
-                   "\u06A7"
-               ],
-               "three_dots_above": [
-                   "\u06A8"
-               ],
-               "dot_below": [
-                   "\u08A5"
-               ],
-               "isolated": "\uFED5",
-               "final": "\uFED6",
-               "initial": "\uFED7",
-               "medial": "\uFED8"
-           },
-           "kaf": {
-               "normal": [
-                   "\u0643"
-               ],
-               "swash": [
-                   "\u06AA"
-               ],
-               "ring": [
-                   "\u06AB"
-               ],
-               "dot_above": [
-                   "\u06AC"
-               ],
-               "three_dots_below": [
-                   "\u06AE"
-               ],
-               "two_dots_above": [
-                   "\u077F"
-               ],
-               "dot_below": [
-                   "\u08B4"
-               ],
-               "isolated": "\uFED9",
-               "final": "\uFEDA",
-               "initial": "\uFEDB",
-               "medial": "\uFEDC"
-           },
-           "lam": {
-               "normal": [
-                   "\u0644"
-               ],
-               "small_v": [
-                   "\u06B5"
-               ],
-               "dot_above": [
-                   "\u06B6"
-               ],
-               "three_dots_above": [
-                   "\u06B7"
-               ],
-               "three_dots_below": [
-                   "\u06B8"
-               ],
-               "bar": [
-                   "\u076A"
-               ],
-               "double_bar": [
-                   "\u08A6"
-               ],
-               "isolated": "\uFEDD",
-               "final": "\uFEDE",
-               "initial": "\uFEDF",
-               "medial": "\uFEE0"
-           },
-           "meem": {
-               "normal": [
-                   "\u0645"
-               ],
-               "dot_above": [
-                   "\u0765"
-               ],
-               "dot_below": [
-                   "\u0766"
-               ],
-               "three_dots_above": [
-                   "\u08A7"
-               ],
-               "isolated": "\uFEE1",
-               "final": "\uFEE2",
-               "initial": "\uFEE3",
-               "medial": "\uFEE4"
-           },
-           "noon": {
-               "normal": [
-                   "\u0646"
-               ],
-               "dot_below": [
-                   "\u06B9"
-               ],
-               "ring": [
-                   "\u06BC"
-               ],
-               "three_dots_above": [
-                   "\u06BD"
-               ],
-               "two_dots_below": [
-                   "\u0767"
-               ],
-               "small_tah": [
-                   "\u0768"
-               ],
-               "small_v": [
-                   "\u0769"
-               ],
-               "isolated": "\uFEE5",
-               "final": "\uFEE6",
-               "initial": "\uFEE7",
-               "medial": "\uFEE8"
-           },
-           "heh": {
-               "normal": [
-                   "\u0647"
-               ],
-               "isolated": "\uFEE9",
-               "final": "\uFEEA",
-               "initial": "\uFEEB",
-               "medial": "\uFEEC"
-           },
-           "waw": {
-               "normal": [
-                   "\u0648"
-               ],
-               "hamza_above": {
-                   "normal": [
-                       "\u0624",
-                       "\u0648\u0654"
-                   ],
-                   "isolated": "\uFE85",
-                   "final": "\uFE86"
-               },
-               "high_hamza": [
-                   "\u0676",
-                   "\u0648\u0674"
-               ],
-               "ring": [
-                   "\u06C4"
-               ],
-               "two_dots_above": [
-                   "\u06CA"
-               ],
-               "dot_above": [
-                   "\u06CF"
-               ],
-               "indic_two_above": [
-                   "\u0778"
-               ],
-               "indic_three_above": [
-                   "\u0779"
-               ],
-               "dot_within": [
-                   "\u08AB"
-               ],
-               "isolated": "\uFEED",
-               "final": "\uFEEE"
-           },
-           "alef_maksura": {
-               "normal": [
-                   "\u0649"
-               ],
-               "hamza_above": [
-                   "\u0626",
-                   "\u064A\u0654"
-               ],
-               "initial": "\uFBE8",
-               "medial": "\uFBE9",
-               "isolated": "\uFEEF",
-               "final": "\uFEF0"
-           },
-           "yeh": {
-               "normal": [
-                   "\u064A"
-               ],
-               "hamza_above": {
-                   "normal": [
-                       "\u0626",
-                       "\u0649\u0654"
-                   ],
-                   "isolated": "\uFE89",
-                   "final": "\uFE8A",
-                   "initial": "\uFE8B",
-                   "medial": "\uFE8C"
-               },
-               "two_dots_below_hamza_above": [
-                   "\u08A8"
-               ],
-               "high_hamza": [
-                   "\u0678",
-                   "\u064A\u0674"
-               ],
-               "tail": [
-                   "\u06CD"
-               ],
-               "small_v": [
-                   "\u06CE"
-               ],
-               "three_dots_below": [
-                   "\u06D1"
-               ],
-               "two_dots_below_dot_above": [
-                   "\u08A9"
-               ],
-               "two_dots_below_small_noon_above": [
-                   "\u08BA"
-               ],
-               "isolated": "\uFEF1",
-               "final": "\uFEF2",
-               "initial": "\uFEF3",
-               "medial": "\uFEF4"
-           },
-           "tteh": {
-               "normal": [
-                   "\u0679"
-               ],
-               "isolated": "\uFB66",
-               "final": "\uFB67",
-               "initial": "\uFB68",
-               "medial": "\uFB69"
-           },
-           "tteheh": {
-               "normal": [
-                   "\u067A"
-               ],
-               "isolated": "\uFB5E",
-               "final": "\uFB5F",
-               "initial": "\uFB60",
-               "medial": "\uFB61"
-           },
-           "beeh": {
-               "normal": [
-                   "\u067B"
-               ],
-               "isolated": "\uFB52",
-               "final": "\uFB53",
-               "initial": "\uFB54",
-               "medial": "\uFB55"
-           },
-           "peh": {
-               "normal": [
-                   "\u067E"
-               ],
-               "small_meem_above": [
-                   "\u08B7"
-               ],
-               "isolated": "\uFB56",
-               "final": "\uFB57",
-               "initial": "\uFB58",
-               "medial": "\uFB59"
-           },
-           "teheh": {
-               "normal": [
-                   "\u067F"
-               ],
-               "isolated": "\uFB62",
-               "final": "\uFB63",
-               "initial": "\uFB64",
-               "medial": "\uFB65"
-           },
-           "beheh": {
-               "normal": [
-                   "\u0680"
-               ],
-               "isolated": "\uFB5A",
-               "final": "\uFB5B",
-               "initial": "\uFB5C",
-               "medial": "\uFB5D"
-           },
-           "nyeh": {
-               "normal": [
-                   "\u0683"
-               ],
-               "isolated": "\uFB76",
-               "final": "\uFB77",
-               "initial": "\uFB78",
-               "medial": "\uFB79"
-           },
-           "dyeh": {
-               "normal": [
-                   "\u0684"
-               ],
-               "isolated": "\uFB72",
-               "final": "\uFB73",
-               "initial": "\uFB74",
-               "medial": "\uFB75"
-           },
-           "tcheh": {
-               "normal": [
-                   "\u0686"
-               ],
-               "dot_above": [
-                   "\u06BF"
-               ],
-               "isolated": "\uFB7A",
-               "final": "\uFB7B",
-               "initial": "\uFB7C",
-               "medial": "\uFB7D"
-           },
-           "tcheheh": {
-               "normal": [
-                   "\u0687"
-               ],
-               "isolated": "\uFB7E",
-               "final": "\uFB7F",
-               "initial": "\uFB80",
-               "medial": "\uFB81"
-           },
-           "ddal": {
-               "normal": [
-                   "\u0688"
-               ],
-               "isolated": "\uFB88",
-               "final": "\uFB89"
-           },
-           "dahal": {
-               "normal": [
-                   "\u068C"
-               ],
-               "isolated": "\uFB84",
-               "final": "\uFB85"
-           },
-           "ddahal": {
-               "normal": [
-                   "\u068D"
-               ],
-               "isolated": "\uFB82",
-               "final": "\uFB83"
-           },
-           "dul": {
-               "normal": [
-                   "\u068F",
-                   "\u068E"
-               ],
-               "isolated": "\uFB86",
-               "final": "\uFB87"
-           },
-           "rreh": {
-               "normal": [
-                   "\u0691"
-               ],
-               "isolated": "\uFB8C",
-               "final": "\uFB8D"
-           },
-           "jeh": {
-               "normal": [
-                   "\u0698"
-               ],
-               "isolated": "\uFB8A",
-               "final": "\uFB8B"
-           },
-           "veh": {
-               "normal": [
-                   "\u06A4"
-               ],
-               "isolated": "\uFB6A",
-               "final": "\uFB6B",
-               "initial": "\uFB6C",
-               "medial": "\uFB6D"
-           },
-           "peheh": {
-               "normal": [
-                   "\u06A6"
-               ],
-               "isolated": "\uFB6E",
-               "final": "\uFB6F",
-               "initial": "\uFB70",
-               "medial": "\uFB71"
-           },
-           "keheh": {
-               "normal": [
-                   "\u06A9"
-               ],
-               "dot_above": [
-                   "\u0762"
-               ],
-               "three_dots_above": [
-                   "\u0763"
-               ],
-               "three_dots_pointing_upwards_below": [
-                   "\u0764"
-               ],
-               "isolated": "\uFB8E",
-               "final": "\uFB8F",
-               "initial": "\uFB90",
-               "medial": "\uFB91"
-           },
-           "ng": {
-               "normal": [
-                   "\u06AD"
-               ],
-               "isolated": "\uFBD3",
-               "final": "\uFBD4",
-               "initial": "\uFBD5",
-               "medial": "\uFBD6"
-           },
-           "gaf": {
-               "normal": [
-                   "\u06AF"
-               ],
-               "ring": [
-                   "\u06B0"
-               ],
-               "two_dots_below": [
-                   "\u06B2"
-               ],
-               "three_dots_above": [
-                   "\u06B4"
-               ],
-               "inverted_stroke": [
-                   "\u08B0"
-               ],
-               "isolated": "\uFB92",
-               "final": "\uFB93",
-               "initial": "\uFB94",
-               "medial": "\uFB95"
-           },
-           "ngoeh": {
-               "normal": [
-                   "\u06B1"
-               ],
-               "isolated": "\uFB9A",
-               "final": "\uFB9B",
-               "initial": "\uFB9C",
-               "medial": "\uFB9D"
-           },
-           "gueh": {
-               "normal": [
-                   "\u06B3"
-               ],
-               "isolated": "\uFB96",
-               "final": "\uFB97",
-               "initial": "\uFB98",
-               "medial": "\uFB99"
-           },
-           "noon ghunna": {
-               "normal": [
-                   "\u06BA"
-               ],
-               "isolated": "\uFB9E",
-               "final": "\uFB9F"
-           },
-           "rnoon": {
-               "normal": [
-                   "\u06BB"
-               ],
-               "isolated": "\uFBA0",
-               "final": "\uFBA1",
-               "initial": "\uFBA2",
-               "medial": "\uFBA3"
-           },
-           "heh doachashmee": {
-               "normal": [
-                   "\u06BE"
-               ],
-               "isolated": "\uFBAA",
-               "final": "\uFBAB",
-               "initial": "\uFBAC",
-               "medial": "\uFBAD"
-           },
-           "heh goal": {
-               "normal": [
-                   "\u06C1"
-               ],
-               "hamza_above": [
-                   "\u06C1\u0654",
-                   "\u06C2"
-               ],
-               "isolated": "\uFBA6",
-               "final": "\uFBA7",
-               "initial": "\uFBA8",
-               "medial": "\uFBA9"
-           },
-           "teh marbuta goal": {
-               "normal": [
-                   "\u06C3"
-               ]
-           },
-           "kirghiz oe": {
-               "normal": [
-                   "\u06C5"
-               ],
-               "isolated": "\uFBE0",
-               "final": "\uFBE1"
-           },
-           "oe": {
-               "normal": [
-                   "\u06C6"
-               ],
-               "isolated": "\uFBD9",
-               "final": "\uFBDA"
-           },
-           "u": {
-               "normal": [
-                   "\u06C7"
-               ],
-               "hamza_above": {
-                   "normal": [
-                       "\u0677",
-                       "\u06C7\u0674"
-                   ],
-                   "isolated": "\uFBDD"
-               },
-               "isolated": "\uFBD7",
-               "final": "\uFBD8"
-           },
-           "yu": {
-               "normal": [
-                   "\u06C8"
-               ],
-               "isolated": "\uFBDB",
-               "final": "\uFBDC"
-           },
-           "kirghiz yu": {
-               "normal": [
-                   "\u06C9"
-               ],
-               "isolated": "\uFBE2",
-               "final": "\uFBE3"
-           },
-           "ve": {
-               "normal": [
-                   "\u06CB"
-               ],
-               "isolated": "\uFBDE",
-               "final": "\uFBDF"
-           },
-           "farsi yeh": {
-               "normal": [
-                   "\u06CC"
-               ],
-               "indic_two_above": [
-                   "\u0775"
-               ],
-               "indic_three_above": [
-                   "\u0776"
-               ],
-               "indic_four_above": [
-                   "\u0777"
-               ],
-               "isolated": "\uFBFC",
-               "final": "\uFBFD",
-               "initial": "\uFBFE",
-               "medial": "\uFBFF"
-           },
-           "e": {
-               "normal": [
-                   "\u06D0"
-               ],
-               "isolated": "\uFBE4",
-               "final": "\uFBE5",
-               "initial": "\uFBE6",
-               "medial": "\uFBE7"
-           },
-           "yeh barree": {
-               "normal": [
-                   "\u06D2"
-               ],
-               "hamza_above": {
-                   "normal": [
-                       "\u06D2\u0654",
-                       "\u06D3"
-                   ],
-                   "isolated": "\uFBB0",
-                   "final": "\uFBB1"
-               },
-               "indic_two_above": [
-                   "\u077A"
-               ],
-               "indic_three_above": [
-                   "\u077B"
-               ],
-               "isolated": "\uFBAE",
-               "final": "\uFBAF"
-           },
-           "ae": {
-               "normal": [
-                   "\u06D5"
-               ],
-               "isolated": "\u06D5",
-               "final": "\uFEEA",
-               "yeh_above": {
-                   "normal": [
-                       "\u06C0",
-                       "\u06D5\u0654"
-                   ],
-                   "isolated": "\uFBA4",
-                   "final": "\uFBA5"
-               }
-           },
-           "rohingya yeh": {
-               "normal": [
-                   "\u08AC"
-               ]
-           },
-           "low alef": {
-               "normal": [
-                   "\u08AD"
-               ]
-           },
-           "straight waw": {
-               "normal": [
-                   "\u08B1"
-               ]
-           },
-           "african feh": {
-               "normal": [
-                   "\u08BB"
-               ]
-           },
-           "african qaf": {
-               "normal": [
-                   "\u08BC"
-               ]
-           },
-           "african noon": {
-               "normal": [
-                   "\u08BD"
-               ]
-           }
-       };
-       exports.default = arabicReference;
-       });
-
-       var unicodeLigatures = createCommonjsModule(function (module, exports) {
-       Object.defineProperty(exports, "__esModule", { value: true });
-       const ligatureReference = {
-           "\u0626\u0627": {
-               "isolated": "\uFBEA",
-               "final": "\uFBEB"
-           },
-           "\u0626\u06D5": {
-               "isolated": "\uFBEC",
-               "final": "\uFBED"
-           },
-           "\u0626\u0648": {
-               "isolated": "\uFBEE",
-               "final": "\uFBEF"
-           },
-           "\u0626\u06C7": {
-               "isolated": "\uFBF0",
-               "final": "\uFBF1"
-           },
-           "\u0626\u06C6": {
-               "isolated": "\uFBF2",
-               "final": "\uFBF3"
-           },
-           "\u0626\u06C8": {
-               "isolated": "\uFBF4",
-               "final": "\uFBF5"
-           },
-           "\u0626\u06D0": {
-               "isolated": "\uFBF6",
-               "final": "\uFBF7",
-               "initial": "\uFBF8"
-           },
-           "\u0626\u0649": {
-               "uighur_kirghiz": {
-                   "isolated": "\uFBF9",
-                   "final": "\uFBFA",
-                   "initial": "\uFBFB"
-               },
-               "isolated": "\uFC03",
-               "final": "\uFC68"
-           },
-           "\u0626\u062C": {
-               "isolated": "\uFC00",
-               "initial": "\uFC97"
-           },
-           "\u0626\u062D": {
-               "isolated": "\uFC01",
-               "initial": "\uFC98"
-           },
-           "\u0626\u0645": {
-               "isolated": "\uFC02",
-               "final": "\uFC66",
-               "initial": "\uFC9A",
-               "medial": "\uFCDF"
-           },
-           "\u0626\u064A": {
-               "isolated": "\uFC04",
-               "final": "\uFC69"
-           },
-           "\u0628\u062C": {
-               "isolated": "\uFC05",
-               "initial": "\uFC9C"
-           },
-           "\u0628\u062D": {
-               "isolated": "\uFC06",
-               "initial": "\uFC9D"
-           },
-           "\u0628\u062E": {
-               "isolated": "\uFC07",
-               "initial": "\uFC9E"
-           },
-           "\u0628\u0645": {
-               "isolated": "\uFC08",
-               "final": "\uFC6C",
-               "initial": "\uFC9F",
-               "medial": "\uFCE1"
-           },
-           "\u0628\u0649": {
-               "isolated": "\uFC09",
-               "final": "\uFC6E"
-           },
-           "\u0628\u064A": {
-               "isolated": "\uFC0A",
-               "final": "\uFC6F"
-           },
-           "\u062A\u062C": {
-               "isolated": "\uFC0B",
-               "initial": "\uFCA1"
-           },
-           "\u062A\u062D": {
-               "isolated": "\uFC0C",
-               "initial": "\uFCA2"
-           },
-           "\u062A\u062E": {
-               "isolated": "\uFC0D",
-               "initial": "\uFCA3"
-           },
-           "\u062A\u0645": {
-               "isolated": "\uFC0E",
-               "final": "\uFC72",
-               "initial": "\uFCA4",
-               "medial": "\uFCE3"
-           },
-           "\u062A\u0649": {
-               "isolated": "\uFC0F",
-               "final": "\uFC74"
-           },
-           "\u062A\u064A": {
-               "isolated": "\uFC10",
-               "final": "\uFC75"
-           },
-           "\u062B\u062C": {
-               "isolated": "\uFC11"
-           },
-           "\u062B\u0645": {
-               "isolated": "\uFC12",
-               "final": "\uFC78",
-               "initial": "\uFCA6",
-               "medial": "\uFCE5"
-           },
-           "\u062B\u0649": {
-               "isolated": "\uFC13",
-               "final": "\uFC7A"
-           },
-           "\u062B\u0648": {
-               "isolated": "\uFC14"
-           },
-           "\u062C\u062D": {
-               "isolated": "\uFC15",
-               "initial": "\uFCA7"
-           },
-           "\u062C\u0645": {
-               "isolated": "\uFC16",
-               "initial": "\uFCA8"
-           },
-           "\u062D\u062C": {
-               "isolated": "\uFC17",
-               "initial": "\uFCA9"
-           },
-           "\u062D\u0645": {
-               "isolated": "\uFC18",
-               "initial": "\uFCAA"
-           },
-           "\u062E\u062C": {
-               "isolated": "\uFC19",
-               "initial": "\uFCAB"
-           },
-           "\u062E\u062D": {
-               "isolated": "\uFC1A"
-           },
-           "\u062E\u0645": {
-               "isolated": "\uFC1B",
-               "initial": "\uFCAC"
-           },
-           "\u0633\u062C": {
-               "isolated": "\uFC1C",
-               "initial": "\uFCAD",
-               "medial": "\uFD34"
-           },
-           "\u0633\u062D": {
-               "isolated": "\uFC1D",
-               "initial": "\uFCAE",
-               "medial": "\uFD35"
-           },
-           "\u0633\u062E": {
-               "isolated": "\uFC1E",
-               "initial": "\uFCAF",
-               "medial": "\uFD36"
-           },
-           "\u0633\u0645": {
-               "isolated": "\uFC1F",
-               "initial": "\uFCB0",
-               "medial": "\uFCE7"
-           },
-           "\u0635\u062D": {
-               "isolated": "\uFC20",
-               "initial": "\uFCB1"
-           },
-           "\u0635\u0645": {
-               "isolated": "\uFC21",
-               "initial": "\uFCB3"
-           },
-           "\u0636\u062C": {
-               "isolated": "\uFC22",
-               "initial": "\uFCB4"
-           },
-           "\u0636\u062D": {
-               "isolated": "\uFC23",
-               "initial": "\uFCB5"
-           },
-           "\u0636\u062E": {
-               "isolated": "\uFC24",
-               "initial": "\uFCB6"
-           },
-           "\u0636\u0645": {
-               "isolated": "\uFC25",
-               "initial": "\uFCB7"
-           },
-           "\u0637\u062D": {
-               "isolated": "\uFC26",
-               "initial": "\uFCB8"
-           },
-           "\u0637\u0645": {
-               "isolated": "\uFC27",
-               "initial": "\uFD33",
-               "medial": "\uFD3A"
-           },
-           "\u0638\u0645": {
-               "isolated": "\uFC28",
-               "initial": "\uFCB9",
-               "medial": "\uFD3B"
-           },
-           "\u0639\u062C": {
-               "isolated": "\uFC29",
-               "initial": "\uFCBA"
-           },
-           "\u0639\u0645": {
-               "isolated": "\uFC2A",
-               "initial": "\uFCBB"
-           },
-           "\u063A\u062C": {
-               "isolated": "\uFC2B",
-               "initial": "\uFCBC"
-           },
-           "\u063A\u0645": {
-               "isolated": "\uFC2C",
-               "initial": "\uFCBD"
-           },
-           "\u0641\u062C": {
-               "isolated": "\uFC2D",
-               "initial": "\uFCBE"
-           },
-           "\u0641\u062D": {
-               "isolated": "\uFC2E",
-               "initial": "\uFCBF"
-           },
-           "\u0641\u062E": {
-               "isolated": "\uFC2F",
-               "initial": "\uFCC0"
-           },
-           "\u0641\u0645": {
-               "isolated": "\uFC30",
-               "initial": "\uFCC1"
-           },
-           "\u0641\u0649": {
-               "isolated": "\uFC31",
-               "final": "\uFC7C"
-           },
-           "\u0641\u064A": {
-               "isolated": "\uFC32",
-               "final": "\uFC7D"
-           },
-           "\u0642\u062D": {
-               "isolated": "\uFC33",
-               "initial": "\uFCC2"
-           },
-           "\u0642\u0645": {
-               "isolated": "\uFC34",
-               "initial": "\uFCC3"
-           },
-           "\u0642\u0649": {
-               "isolated": "\uFC35",
-               "final": "\uFC7E"
-           },
-           "\u0642\u064A": {
-               "isolated": "\uFC36",
-               "final": "\uFC7F"
-           },
-           "\u0643\u0627": {
-               "isolated": "\uFC37",
-               "final": "\uFC80"
-           },
-           "\u0643\u062C": {
-               "isolated": "\uFC38",
-               "initial": "\uFCC4"
-           },
-           "\u0643\u062D": {
-               "isolated": "\uFC39",
-               "initial": "\uFCC5"
-           },
-           "\u0643\u062E": {
-               "isolated": "\uFC3A",
-               "initial": "\uFCC6"
-           },
-           "\u0643\u0644": {
-               "isolated": "\uFC3B",
-               "final": "\uFC81",
-               "initial": "\uFCC7",
-               "medial": "\uFCEB"
-           },
-           "\u0643\u0645": {
-               "isolated": "\uFC3C",
-               "final": "\uFC82",
-               "initial": "\uFCC8",
-               "medial": "\uFCEC"
-           },
-           "\u0643\u0649": {
-               "isolated": "\uFC3D",
-               "final": "\uFC83"
-           },
-           "\u0643\u064A": {
-               "isolated": "\uFC3E",
-               "final": "\uFC84"
-           },
-           "\u0644\u062C": {
-               "isolated": "\uFC3F",
-               "initial": "\uFCC9"
-           },
-           "\u0644\u062D": {
-               "isolated": "\uFC40",
-               "initial": "\uFCCA"
-           },
-           "\u0644\u062E": {
-               "isolated": "\uFC41",
-               "initial": "\uFCCB"
-           },
-           "\u0644\u0645": {
-               "isolated": "\uFC42",
-               "final": "\uFC85",
-               "initial": "\uFCCC",
-               "medial": "\uFCED"
-           },
-           "\u0644\u0649": {
-               "isolated": "\uFC43",
-               "final": "\uFC86"
-           },
-           "\u0644\u064A": {
-               "isolated": "\uFC44",
-               "final": "\uFC87"
-           },
-           "\u0645\u062C": {
-               "isolated": "\uFC45",
-               "initial": "\uFCCE"
-           },
-           "\u0645\u062D": {
-               "isolated": "\uFC46",
-               "initial": "\uFCCF"
-           },
-           "\u0645\u062E": {
-               "isolated": "\uFC47",
-               "initial": "\uFCD0"
-           },
-           "\u0645\u0645": {
-               "isolated": "\uFC48",
-               "final": "\uFC89",
-               "initial": "\uFCD1"
-           },
-           "\u0645\u0649": {
-               "isolated": "\uFC49"
-           },
-           "\u0645\u064A": {
-               "isolated": "\uFC4A"
-           },
-           "\u0646\u062C": {
-               "isolated": "\uFC4B",
-               "initial": "\uFCD2"
-           },
-           "\u0646\u062D": {
-               "isolated": "\uFC4C",
-               "initial": "\uFCD3"
-           },
-           "\u0646\u062E": {
-               "isolated": "\uFC4D",
-               "initial": "\uFCD4"
-           },
-           "\u0646\u0645": {
-               "isolated": "\uFC4E",
-               "final": "\uFC8C",
-               "initial": "\uFCD5",
-               "medial": "\uFCEE"
-           },
-           "\u0646\u0649": {
-               "isolated": "\uFC4F",
-               "final": "\uFC8E"
-           },
-           "\u0646\u064A": {
-               "isolated": "\uFC50",
-               "final": "\uFC8F"
-           },
-           "\u0647\u062C": {
-               "isolated": "\uFC51",
-               "initial": "\uFCD7"
-           },
-           "\u0647\u0645": {
-               "isolated": "\uFC52",
-               "initial": "\uFCD8"
-           },
-           "\u0647\u0649": {
-               "isolated": "\uFC53"
-           },
-           "\u0647\u064A": {
-               "isolated": "\uFC54"
-           },
-           "\u064A\u062C": {
-               "isolated": "\uFC55",
-               "initial": "\uFCDA"
-           },
-           "\u064A\u062D": {
-               "isolated": "\uFC56",
-               "initial": "\uFCDB"
-           },
-           "\u064A\u062E": {
-               "isolated": "\uFC57",
-               "initial": "\uFCDC"
-           },
-           "\u064A\u0645": {
-               "isolated": "\uFC58",
-               "final": "\uFC93",
-               "initial": "\uFCDD",
-               "medial": "\uFCF0"
-           },
-           "\u064A\u0649": {
-               "isolated": "\uFC59",
-               "final": "\uFC95"
-           },
-           "\u064A\u064A": {
-               "isolated": "\uFC5A",
-               "final": "\uFC96"
-           },
-           "\u0630\u0670": {
-               "isolated": "\uFC5B"
-           },
-           "\u0631\u0670": {
-               "isolated": "\uFC5C"
-           },
-           "\u0649\u0670": {
-               "isolated": "\uFC5D",
-               "final": "\uFC90"
-           },
-           "\u064C\u0651": {
-               "isolated": "\uFC5E"
-           },
-           "\u064D\u0651": {
-               "isolated": "\uFC5F"
-           },
-           "\u064E\u0651": {
-               "isolated": "\uFC60"
-           },
-           "\u064F\u0651": {
-               "isolated": "\uFC61"
-           },
-           "\u0650\u0651": {
-               "isolated": "\uFC62"
-           },
-           "\u0651\u0670": {
-               "isolated": "\uFC63"
-           },
-           "\u0626\u0631": {
-               "final": "\uFC64"
-           },
-           "\u0626\u0632": {
-               "final": "\uFC65"
-           },
-           "\u0626\u0646": {
-               "final": "\uFC67"
-           },
-           "\u0628\u0631": {
-               "final": "\uFC6A"
-           },
-           "\u0628\u0632": {
-               "final": "\uFC6B"
-           },
-           "\u0628\u0646": {
-               "final": "\uFC6D"
-           },
-           "\u062A\u0631": {
-               "final": "\uFC70"
-           },
-           "\u062A\u0632": {
-               "final": "\uFC71"
-           },
-           "\u062A\u0646": {
-               "final": "\uFC73"
-           },
-           "\u062B\u0631": {
-               "final": "\uFC76"
-           },
-           "\u062B\u0632": {
-               "final": "\uFC77"
-           },
-           "\u062B\u0646": {
-               "final": "\uFC79"
-           },
-           "\u062B\u064A": {
-               "final": "\uFC7B"
-           },
-           "\u0645\u0627": {
-               "final": "\uFC88"
-           },
-           "\u0646\u0631": {
-               "final": "\uFC8A"
-           },
-           "\u0646\u0632": {
-               "final": "\uFC8B"
-           },
-           "\u0646\u0646": {
-               "final": "\uFC8D"
-           },
-           "\u064A\u0631": {
-               "final": "\uFC91"
-           },
-           "\u064A\u0632": {
-               "final": "\uFC92"
-           },
-           "\u064A\u0646": {
-               "final": "\uFC94"
-           },
-           "\u0626\u062E": {
-               "initial": "\uFC99"
-           },
-           "\u0626\u0647": {
-               "initial": "\uFC9B",
-               "medial": "\uFCE0"
-           },
-           "\u0628\u0647": {
-               "initial": "\uFCA0",
-               "medial": "\uFCE2"
-           },
-           "\u062A\u0647": {
-               "initial": "\uFCA5",
-               "medial": "\uFCE4"
-           },
-           "\u0635\u062E": {
-               "initial": "\uFCB2"
-           },
-           "\u0644\u0647": {
-               "initial": "\uFCCD"
-           },
-           "\u0646\u0647": {
-               "initial": "\uFCD6",
-               "medial": "\uFCEF"
-           },
-           "\u0647\u0670": {
-               "initial": "\uFCD9"
-           },
-           "\u064A\u0647": {
-               "initial": "\uFCDE",
-               "medial": "\uFCF1"
-           },
-           "\u062B\u0647": {
-               "medial": "\uFCE6"
-           },
-           "\u0633\u0647": {
-               "medial": "\uFCE8",
-               "initial": "\uFD31"
-           },
-           "\u0634\u0645": {
-               "medial": "\uFCE9",
-               "isolated": "\uFD0C",
-               "final": "\uFD28",
-               "initial": "\uFD30"
-           },
-           "\u0634\u0647": {
-               "medial": "\uFCEA",
-               "initial": "\uFD32"
-           },
-           "\u0640\u064E\u0651": {
-               "medial": "\uFCF2"
-           },
-           "\u0640\u064F\u0651": {
-               "medial": "\uFCF3"
-           },
-           "\u0640\u0650\u0651": {
-               "medial": "\uFCF4"
-           },
-           "\u0637\u0649": {
-               "isolated": "\uFCF5",
-               "final": "\uFD11"
-           },
-           "\u0637\u064A": {
-               "isolated": "\uFCF6",
-               "final": "\uFD12"
-           },
-           "\u0639\u0649": {
-               "isolated": "\uFCF7",
-               "final": "\uFD13"
-           },
-           "\u0639\u064A": {
-               "isolated": "\uFCF8",
-               "final": "\uFD14"
-           },
-           "\u063A\u0649": {
-               "isolated": "\uFCF9",
-               "final": "\uFD15"
-           },
-           "\u063A\u064A": {
-               "isolated": "\uFCFA",
-               "final": "\uFD16"
-           },
-           "\u0633\u0649": {
-               "isolated": "\uFCFB"
-           },
-           "\u0633\u064A": {
-               "isolated": "\uFCFC",
-               "final": "\uFD18"
-           },
-           "\u0634\u0649": {
-               "isolated": "\uFCFD",
-               "final": "\uFD19"
-           },
-           "\u0634\u064A": {
-               "isolated": "\uFCFE",
-               "final": "\uFD1A"
-           },
-           "\u062D\u0649": {
-               "isolated": "\uFCFF",
-               "final": "\uFD1B"
-           },
-           "\u062D\u064A": {
-               "isolated": "\uFD00",
-               "final": "\uFD1C"
-           },
-           "\u062C\u0649": {
-               "isolated": "\uFD01",
-               "final": "\uFD1D"
-           },
-           "\u062C\u064A": {
-               "isolated": "\uFD02",
-               "final": "\uFD1E"
-           },
-           "\u062E\u0649": {
-               "isolated": "\uFD03",
-               "final": "\uFD1F"
-           },
-           "\u062E\u064A": {
-               "isolated": "\uFD04",
-               "final": "\uFD20"
-           },
-           "\u0635\u0649": {
-               "isolated": "\uFD05",
-               "final": "\uFD21"
-           },
-           "\u0635\u064A": {
-               "isolated": "\uFD06",
-               "final": "\uFD22"
-           },
-           "\u0636\u0649": {
-               "isolated": "\uFD07",
-               "final": "\uFD23"
-           },
-           "\u0636\u064A": {
-               "isolated": "\uFD08",
-               "final": "\uFD24"
-           },
-           "\u0634\u062C": {
-               "isolated": "\uFD09",
-               "final": "\uFD25",
-               "initial": "\uFD2D",
-               "medial": "\uFD37"
-           },
-           "\u0634\u062D": {
-               "isolated": "\uFD0A",
-               "final": "\uFD26",
-               "initial": "\uFD2E",
-               "medial": "\uFD38"
-           },
-           "\u0634\u062E": {
-               "isolated": "\uFD0B",
-               "final": "\uFD27",
-               "initial": "\uFD2F",
-               "medial": "\uFD39"
-           },
-           "\u0634\u0631": {
-               "isolated": "\uFD0D",
-               "final": "\uFD29"
-           },
-           "\u0633\u0631": {
-               "isolated": "\uFD0E",
-               "final": "\uFD2A"
-           },
-           "\u0635\u0631": {
-               "isolated": "\uFD0F",
-               "final": "\uFD2B"
-           },
-           "\u0636\u0631": {
-               "isolated": "\uFD10",
-               "final": "\uFD2C"
-           },
-           "\u0633\u0639": {
-               "final": "\uFD17"
-           },
-           "\u062A\u062C\u0645": {
-               "initial": "\uFD50"
-           },
-           "\u062A\u062D\u062C": {
-               "final": "\uFD51",
-               "initial": "\uFD52"
-           },
-           "\u062A\u062D\u0645": {
-               "initial": "\uFD53"
-           },
-           "\u062A\u062E\u0645": {
-               "initial": "\uFD54"
-           },
-           "\u062A\u0645\u062C": {
-               "initial": "\uFD55"
-           },
-           "\u062A\u0645\u062D": {
-               "initial": "\uFD56"
-           },
-           "\u062A\u0645\u062E": {
-               "initial": "\uFD57"
-           },
-           "\u062C\u0645\u062D": {
-               "final": "\uFD58",
-               "initial": "\uFD59"
-           },
-           "\u062D\u0645\u064A": {
-               "final": "\uFD5A"
-           },
-           "\u062D\u0645\u0649": {
-               "final": "\uFD5B"
-           },
-           "\u0633\u062D\u062C": {
-               "initial": "\uFD5C"
-           },
-           "\u0633\u062C\u062D": {
-               "initial": "\uFD5D"
-           },
-           "\u0633\u062C\u0649": {
-               "final": "\uFD5E"
-           },
-           "\u0633\u0645\u062D": {
-               "final": "\uFD5F",
-               "initial": "\uFD60"
-           },
-           "\u0633\u0645\u062C": {
-               "initial": "\uFD61"
-           },
-           "\u0633\u0645\u0645": {
-               "final": "\uFD62",
-               "initial": "\uFD63"
-           },
-           "\u0635\u062D\u062D": {
-               "final": "\uFD64",
-               "initial": "\uFD65"
-           },
-           "\u0635\u0645\u0645": {
-               "final": "\uFD66",
-               "initial": "\uFDC5"
-           },
-           "\u0634\u062D\u0645": {
-               "final": "\uFD67",
-               "initial": "\uFD68"
-           },
-           "\u0634\u062C\u064A": {
-               "final": "\uFD69"
-           },
-           "\u0634\u0645\u062E": {
-               "final": "\uFD6A",
-               "initial": "\uFD6B"
-           },
-           "\u0634\u0645\u0645": {
-               "final": "\uFD6C",
-               "initial": "\uFD6D"
-           },
-           "\u0636\u062D\u0649": {
-               "final": "\uFD6E"
-           },
-           "\u0636\u062E\u0645": {
-               "final": "\uFD6F",
-               "initial": "\uFD70"
-           },
-           "\u0636\u0645\u062D": {
-               "final": "\uFD71"
-           },
-           "\u0637\u0645\u062D": {
-               "initial": "\uFD72"
-           },
-           "\u0637\u0645\u0645": {
-               "initial": "\uFD73"
-           },
-           "\u0637\u0645\u064A": {
-               "final": "\uFD74"
-           },
-           "\u0639\u062C\u0645": {
-               "final": "\uFD75",
-               "initial": "\uFDC4"
-           },
-           "\u0639\u0645\u0645": {
-               "final": "\uFD76",
-               "initial": "\uFD77"
-           },
-           "\u0639\u0645\u0649": {
-               "final": "\uFD78"
-           },
-           "\u063A\u0645\u0645": {
-               "final": "\uFD79"
-           },
-           "\u063A\u0645\u064A": {
-               "final": "\uFD7A"
-           },
-           "\u063A\u0645\u0649": {
-               "final": "\uFD7B"
-           },
-           "\u0641\u062E\u0645": {
-               "final": "\uFD7C",
-               "initial": "\uFD7D"
-           },
-           "\u0642\u0645\u062D": {
-               "final": "\uFD7E",
-               "initial": "\uFDB4"
-           },
-           "\u0642\u0645\u0645": {
-               "final": "\uFD7F"
-           },
-           "\u0644\u062D\u0645": {
-               "final": "\uFD80",
-               "initial": "\uFDB5"
-           },
-           "\u0644\u062D\u064A": {
-               "final": "\uFD81"
-           },
-           "\u0644\u062D\u0649": {
-               "final": "\uFD82"
-           },
-           "\u0644\u062C\u062C": {
-               "initial": "\uFD83",
-               "final": "\uFD84"
-           },
-           "\u0644\u062E\u0645": {
-               "final": "\uFD85",
-               "initial": "\uFD86"
-           },
-           "\u0644\u0645\u062D": {
-               "final": "\uFD87",
-               "initial": "\uFD88"
-           },
-           "\u0645\u062D\u062C": {
-               "initial": "\uFD89"
-           },
-           "\u0645\u062D\u0645": {
-               "initial": "\uFD8A"
-           },
-           "\u0645\u062D\u064A": {
-               "final": "\uFD8B"
-           },
-           "\u0645\u062C\u062D": {
-               "initial": "\uFD8C"
-           },
-           "\u0645\u062C\u0645": {
-               "initial": "\uFD8D"
-           },
-           "\u0645\u062E\u062C": {
-               "initial": "\uFD8E"
-           },
-           "\u0645\u062E\u0645": {
-               "initial": "\uFD8F"
-           },
-           "\u0645\u062C\u062E": {
-               "initial": "\uFD92"
-           },
-           "\u0647\u0645\u062C": {
-               "initial": "\uFD93"
-           },
-           "\u0647\u0645\u0645": {
-               "initial": "\uFD94"
-           },
-           "\u0646\u062D\u0645": {
-               "initial": "\uFD95"
-           },
-           "\u0646\u062D\u0649": {
-               "final": "\uFD96"
-           },
-           "\u0646\u062C\u0645": {
-               "final": "\uFD97",
-               "initial": "\uFD98"
-           },
-           "\u0646\u062C\u0649": {
-               "final": "\uFD99"
-           },
-           "\u0646\u0645\u064A": {
-               "final": "\uFD9A"
-           },
-           "\u0646\u0645\u0649": {
-               "final": "\uFD9B"
-           },
-           "\u064A\u0645\u0645": {
-               "final": "\uFD9C",
-               "initial": "\uFD9D"
-           },
-           "\u0628\u062E\u064A": {
-               "final": "\uFD9E"
-           },
-           "\u062A\u062C\u064A": {
-               "final": "\uFD9F"
-           },
-           "\u062A\u062C\u0649": {
-               "final": "\uFDA0"
-           },
-           "\u062A\u062E\u064A": {
-               "final": "\uFDA1"
-           },
-           "\u062A\u062E\u0649": {
-               "final": "\uFDA2"
-           },
-           "\u062A\u0645\u064A": {
-               "final": "\uFDA3"
-           },
-           "\u062A\u0645\u0649": {
-               "final": "\uFDA4"
-           },
-           "\u062C\u0645\u064A": {
-               "final": "\uFDA5"
-           },
-           "\u062C\u062D\u0649": {
-               "final": "\uFDA6"
-           },
-           "\u062C\u0645\u0649": {
-               "final": "\uFDA7"
-           },
-           "\u0633\u062E\u0649": {
-               "final": "\uFDA8"
-           },
-           "\u0635\u062D\u064A": {
-               "final": "\uFDA9"
-           },
-           "\u0634\u062D\u064A": {
-               "final": "\uFDAA"
-           },
-           "\u0636\u062D\u064A": {
-               "final": "\uFDAB"
-           },
-           "\u0644\u062C\u064A": {
-               "final": "\uFDAC"
-           },
-           "\u0644\u0645\u064A": {
-               "final": "\uFDAD"
-           },
-           "\u064A\u062D\u064A": {
-               "final": "\uFDAE"
-           },
-           "\u064A\u062C\u064A": {
-               "final": "\uFDAF"
-           },
-           "\u064A\u0645\u064A": {
-               "final": "\uFDB0"
-           },
-           "\u0645\u0645\u064A": {
-               "final": "\uFDB1"
-           },
-           "\u0642\u0645\u064A": {
-               "final": "\uFDB2"
-           },
-           "\u0646\u062D\u064A": {
-               "final": "\uFDB3"
-           },
-           "\u0639\u0645\u064A": {
-               "final": "\uFDB6"
-           },
-           "\u0643\u0645\u064A": {
-               "final": "\uFDB7"
-           },
-           "\u0646\u062C\u062D": {
-               "initial": "\uFDB8",
-               "final": "\uFDBD"
-           },
-           "\u0645\u062E\u064A": {
-               "final": "\uFDB9"
-           },
-           "\u0644\u062C\u0645": {
-               "initial": "\uFDBA",
-               "final": "\uFDBC"
-           },
-           "\u0643\u0645\u0645": {
-               "final": "\uFDBB",
-               "initial": "\uFDC3"
-           },
-           "\u062C\u062D\u064A": {
-               "final": "\uFDBE"
-           },
-           "\u062D\u062C\u064A": {
-               "final": "\uFDBF"
-           },
-           "\u0645\u062C\u064A": {
-               "final": "\uFDC0"
-           },
-           "\u0641\u0645\u064A": {
-               "final": "\uFDC1"
-           },
-           "\u0628\u062D\u064A": {
-               "final": "\uFDC2"
-           },
-           "\u0633\u062E\u064A": {
-               "final": "\uFDC6"
-           },
-           "\u0646\u062C\u064A": {
-               "final": "\uFDC7"
-           },
-           "\u0644\u0622": {
-               "isolated": "\uFEF5",
-               "final": "\uFEF6"
-           },
-           "\u0644\u0623": {
-               "isolated": "\uFEF7",
-               "final": "\uFEF8"
-           },
-           "\u0644\u0625": {
-               "isolated": "\uFEF9",
-               "final": "\uFEFA"
-           },
-           "\u0644\u0627": {
-               "isolated": "\uFEFB",
-               "final": "\uFEFC"
-           },
-           "words": {
-               "\u0635\u0644\u06D2": "\uFDF0",
-               "\u0642\u0644\u06D2": "\uFDF1",
-               "\u0627\u0644\u0644\u0647": "\uFDF2",
-               "\u0627\u0643\u0628\u0631": "\uFDF3",
-               "\u0645\u062D\u0645\u062F": "\uFDF4",
-               "\u0635\u0644\u0639\u0645": "\uFDF5",
-               "\u0631\u0633\u0648\u0644": "\uFDF6",
-               "\u0639\u0644\u064A\u0647": "\uFDF7",
-               "\u0648\u0633\u0644\u0645": "\uFDF8",
-               "\u0635\u0644\u0649": "\uFDF9",
-               "\u0635\u0644\u0649\u0627\u0644\u0644\u0647\u0639\u0644\u064A\u0647\u0648\u0633\u0644\u0645": "\uFDFA",
-               "\u062C\u0644\u062C\u0644\u0627\u0644\u0647": "\uFDFB",
-               "\u0631\u06CC\u0627\u0644": "\uFDFC"
-           }
-       };
-       exports.default = ligatureReference;
-       });
-
-       var reference = createCommonjsModule(function (module, exports) {
-       Object.defineProperty(exports, "__esModule", { value: true });
-
-
-       const letterList = Object.keys(unicodeArabic.default);
-       exports.letterList = letterList;
-       const ligatureList = Object.keys(unicodeLigatures.default);
-       exports.ligatureList = ligatureList;
-       const ligatureWordList = Object.keys(unicodeLigatures.default.words);
-       exports.ligatureWordList = ligatureWordList;
-       const lams = '\u0644\u06B5\u06B6\u06B7\u06B8';
-       exports.lams = lams;
-       const alefs = '\u0627\u0622\u0623\u0625\u0671\u0672\u0673\u0675\u0773\u0774';
-       exports.alefs = alefs;
-       // for (var l = 1; l < lams.length; l++) {
-       //   console.log('-');
-       //   for (var a = 0; a < alefs.length; a++) {
-       //     console.log(a + ': ' + lams[l] + alefs[a]);
-       //   }
-       // }
-       let tashkeel = '\u0605\u0640\u0670\u0674\u06DF\u06E7\u06E8';
-       exports.tashkeel = tashkeel;
-       function addToTashkeel(start, finish) {
-           for (var i = start; i <= finish; i++) {
-               exports.tashkeel = tashkeel += String.fromCharCode(i);
-           }
-       }
-       addToTashkeel(0x0610, 0x061A);
-       addToTashkeel(0x064B, 0x065F);
-       addToTashkeel(0x06D6, 0x06DC);
-       addToTashkeel(0x06E0, 0x06E4);
-       addToTashkeel(0x06EA, 0x06ED);
-       addToTashkeel(0x08D3, 0x08E1);
-       addToTashkeel(0x08E3, 0x08FF);
-       addToTashkeel(0xFE70, 0xFE7F);
-       let lineBreakers = '\u0627\u0629\u0648\u06C0\u06CF\u06FD\u06FE\u076B\u076C\u0771\u0773\u0774\u0778\u0779\u08E2\u08B1\u08B2\u08B9';
-       exports.lineBreakers = lineBreakers;
-       function addToLineBreakers(start, finish) {
-           for (var i = start; i <= finish; i++) {
-               exports.lineBreakers = lineBreakers += String.fromCharCode(i);
-           }
-       }
-       addToLineBreakers(0x0600, 0x061F); // it's OK to include tashkeel in this range as it is ignored
-       addToLineBreakers(0x0621, 0x0625);
-       addToLineBreakers(0x062F, 0x0632);
-       addToLineBreakers(0x0660, 0x066D); // numerals, math
-       addToLineBreakers(0x0671, 0x0677);
-       addToLineBreakers(0x0688, 0x0699);
-       addToLineBreakers(0x06C3, 0x06CB);
-       addToLineBreakers(0x06D2, 0x06F9);
-       addToLineBreakers(0x0759, 0x075B);
-       addToLineBreakers(0x08AA, 0x08AE);
-       addToLineBreakers(0xFB50, 0xFDFD); // presentation forms look like they could connect, but never do
-       // Presentation Forms A includes diacritics but they are meant to stand alone
-       addToLineBreakers(0xFE80, 0xFEFC); // presentation forms look like they could connect, but never do
-       // numerals, math
-       addToLineBreakers(0x10E60, 0x10E7F);
-       addToLineBreakers(0x1EC70, 0x1ECBF);
-       addToLineBreakers(0x1EE00, 0x1EEFF);
-       });
-
-       var GlyphSplitter_1 = createCommonjsModule(function (module, exports) {
-       Object.defineProperty(exports, "__esModule", { value: true });
-
-
-       function GlyphSplitter(word) {
-           let letters = [];
-           let lastLetter = '';
-           word.split('').forEach((letter) => {
-               if (isArabic_1.isArabic(letter)) {
-                   if (reference.tashkeel.indexOf(letter) > -1) {
-                       letters[letters.length - 1] += letter;
-                   }
-                   else if (lastLetter.length && ((reference.lams.indexOf(lastLetter) === 0 && reference.alefs.indexOf(letter) > -1) || (reference.lams.indexOf(lastLetter) > 0 && reference.alefs.indexOf(letter) === 0))) {
-                       // valid LA forms
-                       letters[letters.length - 1] += letter;
-                   }
-                   else {
-                       letters.push(letter);
-                   }
-               }
-               else {
-                   letters.push(letter);
-               }
-               if (reference.tashkeel.indexOf(letter) === -1) {
-                   lastLetter = letter;
-               }
-           });
-           return letters;
-       }
-       exports.GlyphSplitter = GlyphSplitter;
-       });
-
-       var BaselineSplitter_1 = createCommonjsModule(function (module, exports) {
-       Object.defineProperty(exports, "__esModule", { value: true });
-
-
-       function BaselineSplitter(word) {
-           let letters = [];
-           let lastLetter = '';
-           word.split('').forEach((letter) => {
-               if (isArabic_1.isArabic(letter) && isArabic_1.isArabic(lastLetter)) {
-                   if (lastLetter.length && reference.tashkeel.indexOf(letter) > -1) {
-                       letters[letters.length - 1] += letter;
-                   }
-                   else if (reference.lineBreakers.indexOf(lastLetter) > -1) {
-                       letters.push(letter);
-                   }
-                   else {
-                       letters[letters.length - 1] += letter;
-                   }
-               }
-               else {
-                   letters.push(letter);
-               }
-               if (reference.tashkeel.indexOf(letter) === -1) {
-                   // don't allow tashkeel to hide line break
-                   lastLetter = letter;
-               }
-           });
-           return letters;
-       }
-       exports.BaselineSplitter = BaselineSplitter;
-       });
-
-       var Normalization = createCommonjsModule(function (module, exports) {
-       Object.defineProperty(exports, "__esModule", { value: true });
-
-
-
-
-       function Normal(word, breakPresentationForm) {
-           // default is to turn initial/isolated/medial/final presentation form to generic
-           if (typeof breakPresentationForm === 'undefined') {
-               breakPresentationForm = true;
-           }
-           let returnable = '';
-           word.split('').forEach((letter) => {
-               if (!isArabic_1.isArabic(letter)) {
-                   returnable += letter;
-                   return;
-               }
-               for (let w = 0; w < reference.letterList.length; w++) {
-                   // ok so we are checking this potential lettertron
-                   let letterForms = unicodeArabic.default[reference.letterList[w]];
-                   let versions = Object.keys(letterForms);
-                   for (let v = 0; v < versions.length; v++) {
-                       let localVersion = letterForms[versions[v]];
-                       if (typeof localVersion === 'object' && typeof localVersion.indexOf === 'undefined') {
-                           // look at this embedded object
-                           let embeddedForms = Object.keys(localVersion);
-                           for (let ef = 0; ef < embeddedForms.length; ef++) {
-                               let form = localVersion[embeddedForms[ef]];
-                               if (form === letter || (typeof form === 'object' && form.indexOf && form.indexOf(letter) > -1)) {
-                                   // match
-                                   // console.log('embedded match');
-                                   if (form === letter) {
-                                       // match exact
-                                       if (breakPresentationForm && localVersion['normal'] && ['isolated', 'initial', 'medial', 'final'].indexOf(embeddedForms[ef]) > -1) {
-                                           // replace presentation form
-                                           // console.log('keeping normal form of the letter');
-                                           if (typeof localVersion['normal'] === 'object') {
-                                               returnable += localVersion['normal'][0];
-                                           }
-                                           else {
-                                               returnable += localVersion['normal'];
-                                           }
-                                           return;
-                                       }
-                                       // console.log('keeping this letter');
-                                       returnable += letter;
-                                       return;
-                                   }
-                                   else if (typeof form === 'object' && form.indexOf && form.indexOf(letter) > -1) {
-                                       // match
-                                       returnable += form[0];
-                                       // console.log('added the first letter from the same array');
-                                       return;
-                                   }
-                               }
-                           }
-                       }
-                       else if (localVersion === letter) {
-                           // match exact
-                           if (breakPresentationForm && letterForms['normal'] && ['isolated', 'initial', 'medial', 'final'].indexOf(versions[v]) > -1) {
-                               // replace presentation form
-                               // console.log('keeping normal form of the letter');
-                               if (typeof letterForms['normal'] === 'object') {
-                                   returnable += letterForms['normal'][0];
-                               }
-                               else {
-                                   returnable += letterForms['normal'];
-                               }
-                               return;
-                           }
-                           // console.log('keeping this letter');
-                           returnable += letter;
-                           return;
-                       }
-                       else if (typeof localVersion === 'object' && localVersion.indexOf && localVersion.indexOf(letter) > -1) {
-                           // match
-                           returnable += localVersion[0];
-                           // console.log('added the first letter from the same array');
-                           return;
-                       }
-                   }
-               }
-               // try ligatures
-               for (let v2 = 0; v2 < reference.ligatureList.length; v2++) {
-                   let normalForm = reference.ligatureList[v2];
-                   if (normalForm !== 'words') {
-                       let ligForms = Object.keys(unicodeLigatures.default[normalForm]);
-                       for (let f = 0; f < ligForms.length; f++) {
-                           if (unicodeLigatures.default[normalForm][ligForms[f]] === letter) {
-                               returnable += normalForm;
-                               return;
-                           }
-                       }
-                   }
-               }
-               // try words ligatures
-               for (let v3 = 0; v3 < reference.ligatureWordList.length; v3++) {
-                   let normalForm = reference.ligatureWordList[v3];
-                   if (unicodeLigatures.default.words[normalForm] === letter) {
-                       returnable += normalForm;
-                       return;
-                   }
-               }
-               returnable += letter;
-               // console.log('kept the letter')
-           });
-           return returnable;
-       }
-       exports.Normal = Normal;
-       });
-
-       var CharShaper_1 = createCommonjsModule(function (module, exports) {
-       Object.defineProperty(exports, "__esModule", { value: true });
-
-
-
-       function CharShaper(letter, form) {
-           if (!isArabic_1.isArabic(letter)) {
-               // fail not Arabic
-               throw new Error('Not Arabic');
-           }
-           if (letter === "\u0621") {
-               // hamza alone
-               return "\u0621";
-           }
-           for (let w = 0; w < reference.letterList.length; w++) {
-               // ok so we are checking this potential lettertron
-               let letterForms = unicodeArabic.default[reference.letterList[w]];
-               let versions = Object.keys(letterForms);
-               for (let v = 0; v < versions.length; v++) {
-                   let localVersion = letterForms[versions[v]];
-                   if ((localVersion === letter) ||
-                       (typeof localVersion === 'object' && localVersion.indexOf && localVersion.indexOf(letter) > -1)) {
-                       if (versions.indexOf(form) > -1) {
-                           return letterForms[form];
-                       }
-                   }
-                   else if (typeof localVersion === 'object' && typeof localVersion.indexOf === 'undefined') {
-                       // check embedded
-                       let embeddedVersions = Object.keys(localVersion);
-                       for (let ev = 0; ev < embeddedVersions.length; ev++) {
-                           if ((localVersion[embeddedVersions[ev]] === letter) ||
-                               (typeof localVersion[embeddedVersions[ev]] === 'object' && localVersion[embeddedVersions[ev]].indexOf && localVersion[embeddedVersions[ev]].indexOf(letter) > -1)) {
-                               if (embeddedVersions.indexOf(form) > -1) {
-                                   return localVersion[form];
-                               }
-                           }
-                       }
-                   }
-               }
-           }
-       }
-       exports.CharShaper = CharShaper;
-       });
-
-       var WordShaper_1 = createCommonjsModule(function (module, exports) {
-       Object.defineProperty(exports, "__esModule", { value: true });
-
-
-
-
-       function WordShaper(word) {
-           let state = 'initial';
-           let output = '';
-           for (let w = 0; w < word.length; w++) {
-               let nextLetter = ' ';
-               for (let nxw = w + 1; nxw < word.length; nxw++) {
-                   if (!isArabic_1.isArabic(word[nxw])) {
-                       break;
-                   }
-                   if (reference.tashkeel.indexOf(word[nxw]) === -1) {
-                       nextLetter = word[nxw];
-                       break;
-                   }
-               }
-               if (!isArabic_1.isArabic(word[w]) || isArabic_1.isMath(word[w])) {
-                   // space or other non-Arabic
-                   output += word[w];
-                   state = 'initial';
-               }
-               else if (reference.tashkeel.indexOf(word[w]) > -1) {
-                   // tashkeel - add without changing state
-                   output += word[w];
-               }
-               else if ((nextLetter === ' ') // last Arabic letter in this word
-                   || (reference.lineBreakers.indexOf(word[w]) > -1)) { // the current letter is known to break lines
-                   output += CharShaper_1.CharShaper(word[w], state === 'initial' ? 'isolated' : 'final');
-                   state = 'initial';
-               }
-               else if (reference.lams.indexOf(word[w]) > -1 && reference.alefs.indexOf(nextLetter) > -1) {
-                   // LA letters - advance an additional letter after this
-                   output += unicodeLigatures.default[word[w] + nextLetter][(state === 'initial' ? 'isolated' : 'final')];
-                   while (word[w] !== nextLetter) {
-                       w++;
-                   }
-                   state = 'initial';
-               }
-               else {
-                   output += CharShaper_1.CharShaper(word[w], state);
-                   state = 'medial';
-               }
-           }
-           return output;
-       }
-       exports.WordShaper = WordShaper;
-       });
-
-       var ParentLetter_1 = createCommonjsModule(function (module, exports) {
-       Object.defineProperty(exports, "__esModule", { value: true });
-
-
-
-       function ParentLetter(letter) {
-           if (!isArabic_1.isArabic(letter)) {
-               throw new Error('Not an Arabic letter');
-           }
-           for (let w = 0; w < reference.letterList.length; w++) {
-               // ok so we are checking this potential lettertron
-               let letterForms = unicodeArabic.default[reference.letterList[w]];
-               let versions = Object.keys(letterForms);
-               for (let v = 0; v < versions.length; v++) {
-                   let localVersion = letterForms[versions[v]];
-                   if (typeof localVersion === 'object' && typeof localVersion.indexOf === 'undefined') {
-                       // look at this embedded object
-                       let embeddedForms = Object.keys(localVersion);
-                       for (let ef = 0; ef < embeddedForms.length; ef++) {
-                           let form = localVersion[embeddedForms[ef]];
-                           if (form === letter || (typeof form === 'object' && form.indexOf && form.indexOf(letter) > -1)) {
-                               // match
-                               return localVersion;
-                           }
-                       }
-                   }
-                   else if (localVersion === letter || (typeof localVersion === 'object' && localVersion.indexOf && localVersion.indexOf(letter) > -1)) {
-                       // match
-                       return letterForms;
-                   }
-               }
-               return null;
-           }
-       }
-       exports.ParentLetter = ParentLetter;
-       function GrandparentLetter(letter) {
-           if (!isArabic_1.isArabic(letter)) {
-               throw new Error('Not an Arabic letter');
-           }
-           for (let w = 0; w < reference.letterList.length; w++) {
-               // ok so we are checking this potential lettertron
-               let letterForms = unicodeArabic.default[reference.letterList[w]];
-               let versions = Object.keys(letterForms);
-               for (let v = 0; v < versions.length; v++) {
-                   let localVersion = letterForms[versions[v]];
-                   if (typeof localVersion === 'object' && typeof localVersion.indexOf === 'undefined') {
-                       // look at this embedded object
-                       let embeddedForms = Object.keys(localVersion);
-                       for (let ef = 0; ef < embeddedForms.length; ef++) {
-                           let form = localVersion[embeddedForms[ef]];
-                           if (form === letter || (typeof form === 'object' && form.indexOf && form.indexOf(letter) > -1)) {
-                               // match
-                               return letterForms;
-                           }
-                       }
-                   }
-                   else if (localVersion === letter || (typeof localVersion === 'object' && localVersion.indexOf && localVersion.indexOf(letter) > -1)) {
-                       // match
-                       return letterForms;
-                   }
-               }
-               return null;
-           }
-       }
-       exports.GrandparentLetter = GrandparentLetter;
-       });
-
-       var lib$1 = createCommonjsModule(function (module, exports) {
-       Object.defineProperty(exports, "__esModule", { value: true });
-
-       exports.isArabic = isArabic_1.isArabic;
-
-       exports.GlyphSplitter = GlyphSplitter_1.GlyphSplitter;
-
-       exports.BaselineSplitter = BaselineSplitter_1.BaselineSplitter;
-
-       exports.Normal = Normalization.Normal;
-
-       exports.CharShaper = CharShaper_1.CharShaper;
-
-       exports.WordShaper = WordShaper_1.WordShaper;
-
-       exports.ParentLetter = ParentLetter_1.ParentLetter;
-       exports.GrandparentLetter = ParentLetter_1.GrandparentLetter;
-       });
-
-       // see https://github.com/openstreetmap/iD/pull/3707
-
-       var rtlRegex = /[\u0590-\u05FF\u0600-\u06FF\u0750-\u07BF\u08A0–\u08BF]/;
-
-       function fixRTLTextForSvg(inputText) {
-           var ret = '', rtlBuffer = [];
-           var arabicRegex = /[\u0600-\u06FF]/g;
-           var arabicDiacritics = /[\u0610-\u061A\u064B-\u065F\u0670\u06D6-\u06ED]/g;
-           var arabicMath = /[\u0660-\u066C\u06F0-\u06F9]+/g;
-           var thaanaVowel = /[\u07A6-\u07B0]/;
-           var hebrewSign = /[\u0591-\u05bd\u05bf\u05c1-\u05c5\u05c7]/;
-
-           // Arabic word shaping
-           if (arabicRegex.test(inputText)) {
-               inputText = lib$1.WordShaper(inputText);
-           }
-
-           for (var n = 0; n < inputText.length; n++) {
-               var c = inputText[n];
-               if (arabicMath.test(c)) {
-                   // Arabic numbers go LTR
-                   ret += rtlBuffer.reverse().join('');
-                   rtlBuffer = [c];
-               } else {
-                   if (rtlBuffer.length && arabicMath.test(rtlBuffer[rtlBuffer.length - 1])) {
-                       ret += rtlBuffer.reverse().join('');
-                       rtlBuffer = [];
-                   }
-                   if ((thaanaVowel.test(c) || hebrewSign.test(c) || arabicDiacritics.test(c)) && rtlBuffer.length) {
-                       rtlBuffer[rtlBuffer.length - 1] += c;
-                   } else if (rtlRegex.test(c)
-                       // include Arabic presentation forms
-                       || (c.charCodeAt(0) >= 64336 && c.charCodeAt(0) <= 65023)
-                       || (c.charCodeAt(0) >= 65136 && c.charCodeAt(0) <= 65279)) {
-                       rtlBuffer.push(c);
-                   } else if (c === ' ' && rtlBuffer.length) {
-                       // whitespace within RTL text
-                       rtlBuffer = [rtlBuffer.reverse().join('') + ' '];
-                   } else {
-                       // non-RTL character
-                       ret += rtlBuffer.reverse().join('') + c;
-                       rtlBuffer = [];
-                   }
-               }
-           }
-           ret += rtlBuffer.reverse().join('');
-           return ret;
-       }
-
-       // https://github.com/openstreetmap/iD/issues/772
-       // http://mathiasbynens.be/notes/localstorage-pattern#comment-9
-       let _storage;
-       try { _storage = localStorage; } catch (e) {}  // eslint-disable-line no-empty
-       _storage = _storage || (() => {
-         let s = {};
-         return {
-           getItem: (k) => s[k],
-           setItem: (k, v) => s[k] = v,
-           removeItem: (k) => delete s[k]
-         };
-       })();
-
-       //
-       // corePreferences is an interface for persisting basic key-value strings
-       // within and between iD sessions on the same site.
-       //
-       function corePreferences(k, v) {
-
-         try {
-           if (arguments.length === 1) return _storage.getItem(k);
-           else if (v === null) _storage.removeItem(k);
-           else _storage.setItem(k, v);
-         } catch (e) {
-           /* eslint-disable no-console */
-           if (typeof console !== 'undefined') {
-             console.error('localStorage quota exceeded');
-           }
-           /* eslint-enable no-console */
-         }
-
-       }
-
-       function responseText(response) {
-         if (!response.ok) throw new Error(response.status + " " + response.statusText);
-         return response.text();
-       }
-
-       function d3_text(input, init) {
-         return fetch(input, init).then(responseText);
-       }
-
-       function responseJson(response) {
-         if (!response.ok) throw new Error(response.status + " " + response.statusText);
-         if (response.status === 204 || response.status === 205) return;
-         return response.json();
-       }
-
-       function d3_json(input, init) {
-         return fetch(input, init).then(responseJson);
-       }
-
-       function parser(type) {
-         return function(input, init)  {
-           return d3_text(input, init).then(function(text) {
-             return (new DOMParser).parseFromString(text, type);
-           });
-         };
-       }
-
-       var d3_xml = parser("application/xml");
-
-       var svg = parser("image/svg+xml");
-
-       let _mainFileFetcher = coreFileFetcher(); // singleton
-
-       //
-       // coreFileFetcher asynchronously fetches data from JSON files
-       //
-       function coreFileFetcher() {
-         let _this = {};
-         let _inflight = {};
-         let _fileMap = {
-           'address_formats': 'data/address_formats.min.json',
-           'deprecated': 'data/deprecated.min.json',
-           'discarded': 'data/discarded.min.json',
-           'imagery': 'data/imagery.min.json',
-           'intro_graph': 'data/intro_graph.min.json',
-           'keepRight': 'data/keepRight.min.json',
-           'languages': 'data/languages.min.json',
-           'locales': 'data/locales.min.json',
-           'nsi_brands': 'https://cdn.jsdelivr.net/npm/name-suggestion-index@4/dist/brands.min.json',
-           'nsi_filters': 'https://cdn.jsdelivr.net/npm/name-suggestion-index@4/dist/filters.min.json',
-           'oci_features': 'https://cdn.jsdelivr.net/npm/osm-community-index@2/dist/features.min.json',
-           'oci_resources': 'https://cdn.jsdelivr.net/npm/osm-community-index@2/dist/resources.min.json',
-           'preset_categories': 'data/preset_categories.min.json',
-           'preset_defaults': 'data/preset_defaults.min.json',
-           'preset_fields': 'data/preset_fields.min.json',
-           'preset_presets': 'data/preset_presets.min.json',
-           'phone_formats': 'data/phone_formats.min.json',
-           'qa_data': 'data/qa_data.min.json',
-           'shortcuts': 'data/shortcuts.min.json',
-           'territory_languages': 'data/territory_languages.min.json',
-           'wmf_sitematrix': 'https://cdn.jsdelivr.net/npm/wmf-sitematrix@0.1/wikipedia.min.json'
-         };
-
-         let _cachedData = {};
-         // expose the cache; useful for tests
-         _this.cache = () => _cachedData;
-
-
-         // Returns a Promise to fetch data
-         // (resolved with the data if we have it already)
-         _this.get = (which) => {
-           if (_cachedData[which]) {
-             return Promise.resolve(_cachedData[which]);
-           }
-
-           const file = _fileMap[which];
-           const url = file && _this.asset(file);
-           if (!url) {
-             return Promise.reject(`Unknown data file for "${which}"`);
-           }
-
-           let prom = _inflight[url];
-           if (!prom) {
-             _inflight[url] = prom = d3_json(url)
-               .then(result => {
-                 delete _inflight[url];
-                 if (!result) {
-                   throw new Error(`No data loaded for "${which}"`);
-                 }
-                 _cachedData[which] = result;
-                 return result;
-               })
-               .catch(err => {
-                 delete _inflight[url];
-                 throw err;
-               });
-           }
-
-           return prom;
-         };
-
-
-         // Accessor for the file map
-         _this.fileMap = function(val) {
-           if (!arguments.length) return _fileMap;
-           _fileMap = val;
-           return _this;
-         };
-
-         let _assetPath = '';
-         _this.assetPath = function(val) {
-           if (!arguments.length) return _assetPath;
-           _assetPath = val;
-           return _this;
-         };
-
-         let _assetMap = {};
-         _this.assetMap = function(val) {
-           if (!arguments.length) return _assetMap;
-           _assetMap = val;
-           return _this;
-         };
-
-         _this.asset = (val) => {
-           if (/^http(s)?:\/\//i.test(val)) return val;
-           const filename = _assetPath + val;
-           return _assetMap[filename] || filename;
-         };
-
-         return _this;
-       }
-
-       let _detected;
-
-       function utilDetect(refresh) {
-         if (_detected && !refresh) return _detected;
-         _detected = {};
-
-         const ua = navigator.userAgent;
-         let m = null;
-
-         /* Browser */
-         m = ua.match(/(edge)\/?\s*(\.?\d+(\.\d+)*)/i);   // Edge
-         if (m !== null) {
-           _detected.browser = m[1];
-           _detected.version = m[2];
-         }
-         if (!_detected.browser) {
-           m = ua.match(/Trident\/.*rv:([0-9]{1,}[\.0-9]{0,})/i);   // IE11
-           if (m !== null) {
-             _detected.browser = 'msie';
-             _detected.version = m[1];
-           }
-         }
-         if (!_detected.browser) {
-           m = ua.match(/(opr)\/?\s*(\.?\d+(\.\d+)*)/i);   // Opera 15+
-           if (m !== null) {
-             _detected.browser = 'Opera';
-             _detected.version = m[2];
-           }
-         }
-         if (!_detected.browser) {
-           m = ua.match(/(opera|chrome|safari|firefox|msie)\/?\s*(\.?\d+(\.\d+)*)/i);
-           if (m !== null) {
-             _detected.browser = m[1];
-             _detected.version = m[2];
-             m = ua.match(/version\/([\.\d]+)/i);
-             if (m !== null) _detected.version = m[1];
-           }
-         }
-         if (!_detected.browser) {
-           _detected.browser = navigator.appName;
-           _detected.version = navigator.appVersion;
-         }
-
-         // keep major.minor version only..
-         _detected.version = _detected.version.split(/\W/).slice(0,2).join('.');
-
-         // detect other browser capabilities
-         // Legacy Opera has incomplete svg style support. See #715
-         _detected.opera = (_detected.browser.toLowerCase() === 'opera' && parseFloat(_detected.version) < 15 );
-
-         if (_detected.browser.toLowerCase() === 'msie') {
-           _detected.ie = true;
-           _detected.browser = 'Internet Explorer';
-           _detected.support = parseFloat(_detected.version) >= 11;
-         } else {
-           _detected.ie = false;
-           _detected.support = true;
-         }
-
-         _detected.filedrop = (window.FileReader && 'ondrop' in window);
-         _detected.download = !(_detected.ie || _detected.browser.toLowerCase() === 'edge');
-         _detected.cssfilters = !(_detected.ie || _detected.browser.toLowerCase() === 'edge');
-
-
-         /* Platform */
-         if (/Win/.test(ua)) {
-           _detected.os = 'win';
-           _detected.platform = 'Windows';
-         } else if (/Mac/.test(ua)) {
-           _detected.os = 'mac';
-           _detected.platform = 'Macintosh';
-         } else if (/X11/.test(ua) || /Linux/.test(ua)) {
-           _detected.os = 'linux';
-           _detected.platform = 'Linux';
-         } else {
-           _detected.os = 'win';
-           _detected.platform = 'Unknown';
-         }
-
-         _detected.isMobileWebKit = (/\b(iPad|iPhone|iPod)\b/.test(ua) ||
-           // HACK: iPadOS 13+ requests desktop sites by default by using a Mac user agent,
-           // so assume any "mac" with multitouch is actually iOS
-           (navigator.platform === 'MacIntel' && 'maxTouchPoints' in navigator && navigator.maxTouchPoints > 1)) &&
-           /WebKit/.test(ua) &&
-           !/Edge/.test(ua) &&
-           !window.MSStream;
-
-
-         /* Locale */
-         // An array of locales requested by the browser in priority order.
-         _detected.browserLocales = Array.from(new Set( // remove duplicates
-             [navigator.language]
-               .concat(navigator.languages || [])
-               .concat([
-                   // old property for backwards compatibility
-                   navigator.userLanguage,
-                   // fallback to English
-                   'en'
-               ])
-               // remove any undefined values
-               .filter(Boolean)
-           ));
-
-
-         /* Host */
-         const loc = window.top.location;
-         let origin = loc.origin;
-         if (!origin) {  // for unpatched IE11
-           origin = loc.protocol + '//' + loc.hostname + (loc.port ? ':' + loc.port: '');
-         }
-
-         _detected.host = origin + loc.pathname;
-
-
-         return _detected;
-       }
-
-       var aesJs = createCommonjsModule(function (module, exports) {
-       /*! MIT License. Copyright 2015-2018 Richard Moore <me@ricmoo.com>. See LICENSE.txt. */
-       (function(root) {
-
-           function checkInt(value) {
-               return (parseInt(value) === value);
-           }
-
-           function checkInts(arrayish) {
-               if (!checkInt(arrayish.length)) { return false; }
-
-               for (var i = 0; i < arrayish.length; i++) {
-                   if (!checkInt(arrayish[i]) || arrayish[i] < 0 || arrayish[i] > 255) {
-                       return false;
-                   }
-               }
-
-               return true;
-           }
-
-           function coerceArray(arg, copy) {
-
-               // ArrayBuffer view
-               if (arg.buffer && arg.name === 'Uint8Array') {
-
-                   if (copy) {
-                       if (arg.slice) {
-                           arg = arg.slice();
-                       } else {
-                           arg = Array.prototype.slice.call(arg);
-                       }
-                   }
-
-                   return arg;
-               }
-
-               // It's an array; check it is a valid representation of a byte
-               if (Array.isArray(arg)) {
-                   if (!checkInts(arg)) {
-                       throw new Error('Array contains invalid value: ' + arg);
-                   }
-
-                   return new Uint8Array(arg);
-               }
-
-               // Something else, but behaves like an array (maybe a Buffer? Arguments?)
-               if (checkInt(arg.length) && checkInts(arg)) {
-                   return new Uint8Array(arg);
-               }
-
-               throw new Error('unsupported array-like object');
-           }
-
-           function createArray(length) {
-               return new Uint8Array(length);
-           }
-
-           function copyArray(sourceArray, targetArray, targetStart, sourceStart, sourceEnd) {
-               if (sourceStart != null || sourceEnd != null) {
-                   if (sourceArray.slice) {
-                       sourceArray = sourceArray.slice(sourceStart, sourceEnd);
-                   } else {
-                       sourceArray = Array.prototype.slice.call(sourceArray, sourceStart, sourceEnd);
-                   }
-               }
-               targetArray.set(sourceArray, targetStart);
-           }
-
-
-
-           var convertUtf8 = (function() {
-               function toBytes(text) {
-                   var result = [], i = 0;
-                   text = encodeURI(text);
-                   while (i < text.length) {
-                       var c = text.charCodeAt(i++);
-
-                       // if it is a % sign, encode the following 2 bytes as a hex value
-                       if (c === 37) {
-                           result.push(parseInt(text.substr(i, 2), 16));
-                           i += 2;
-
-                       // otherwise, just the actual byte
-                       } else {
-                           result.push(c);
-                       }
-                   }
-
-                   return coerceArray(result);
-               }
-
-               function fromBytes(bytes) {
-                   var result = [], i = 0;
-
-                   while (i < bytes.length) {
-                       var c = bytes[i];
-
-                       if (c < 128) {
-                           result.push(String.fromCharCode(c));
-                           i++;
-                       } else if (c > 191 && c < 224) {
-                           result.push(String.fromCharCode(((c & 0x1f) << 6) | (bytes[i + 1] & 0x3f)));
-                           i += 2;
-                       } else {
-                           result.push(String.fromCharCode(((c & 0x0f) << 12) | ((bytes[i + 1] & 0x3f) << 6) | (bytes[i + 2] & 0x3f)));
-                           i += 3;
-                       }
-                   }
-
-                   return result.join('');
-               }
-
-               return {
-                   toBytes: toBytes,
-                   fromBytes: fromBytes,
-               }
-           })();
-
-           var convertHex = (function() {
-               function toBytes(text) {
-                   var result = [];
-                   for (var i = 0; i < text.length; i += 2) {
-                       result.push(parseInt(text.substr(i, 2), 16));
-                   }
-
-                   return result;
-               }
-
-               // http://ixti.net/development/javascript/2011/11/11/base64-encodedecode-of-utf8-in-browser-with-js.html
-               var Hex = '0123456789abcdef';
-
-               function fromBytes(bytes) {
-                       var result = [];
-                       for (var i = 0; i < bytes.length; i++) {
-                           var v = bytes[i];
-                           result.push(Hex[(v & 0xf0) >> 4] + Hex[v & 0x0f]);
-                       }
-                       return result.join('');
-               }
-
-               return {
-                   toBytes: toBytes,
-                   fromBytes: fromBytes,
-               }
-           })();
-
-
-           // Number of rounds by keysize
-           var numberOfRounds = {16: 10, 24: 12, 32: 14};
-
-           // Round constant words
-           var rcon = [0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91];
-
-           // S-box and Inverse S-box (S is for Substitution)
-           var S = [0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16];
-           var Si =[0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb, 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92, 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84, 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73, 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e, 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4, 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef, 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d];
-
-           // Transformations for encryption
-           var T1 = [0xc66363a5, 0xf87c7c84, 0xee777799, 0xf67b7b8d, 0xfff2f20d, 0xd66b6bbd, 0xde6f6fb1, 0x91c5c554, 0x60303050, 0x02010103, 0xce6767a9, 0x562b2b7d, 0xe7fefe19, 0xb5d7d762, 0x4dababe6, 0xec76769a, 0x8fcaca45, 0x1f82829d, 0x89c9c940, 0xfa7d7d87, 0xeffafa15, 0xb25959eb, 0x8e4747c9, 0xfbf0f00b, 0x41adadec, 0xb3d4d467, 0x5fa2a2fd, 0x45afafea, 0x239c9cbf, 0x53a4a4f7, 0xe4727296, 0x9bc0c05b, 0x75b7b7c2, 0xe1fdfd1c, 0x3d9393ae, 0x4c26266a, 0x6c36365a, 0x7e3f3f41, 0xf5f7f702, 0x83cccc4f, 0x6834345c, 0x51a5a5f4, 0xd1e5e534, 0xf9f1f108, 0xe2717193, 0xabd8d873, 0x62313153, 0x2a15153f, 0x0804040c, 0x95c7c752, 0x46232365, 0x9dc3c35e, 0x30181828, 0x379696a1, 0x0a05050f, 0x2f9a9ab5, 0x0e070709, 0x24121236, 0x1b80809b, 0xdfe2e23d, 0xcdebeb26, 0x4e272769, 0x7fb2b2cd, 0xea75759f, 0x1209091b, 0x1d83839e, 0x582c2c74, 0x341a1a2e, 0x361b1b2d, 0xdc6e6eb2, 0xb45a5aee, 0x5ba0a0fb, 0xa45252f6, 0x763b3b4d, 0xb7d6d661, 0x7db3b3ce, 0x5229297b, 0xdde3e33e, 0x5e2f2f71, 0x13848497, 0xa65353f5, 0xb9d1d168, 0x00000000, 0xc1eded2c, 0x40202060, 0xe3fcfc1f, 0x79b1b1c8, 0xb65b5bed, 0xd46a6abe, 0x8dcbcb46, 0x67bebed9, 0x7239394b, 0x944a4ade, 0x984c4cd4, 0xb05858e8, 0x85cfcf4a, 0xbbd0d06b, 0xc5efef2a, 0x4faaaae5, 0xedfbfb16, 0x864343c5, 0x9a4d4dd7, 0x66333355, 0x11858594, 0x8a4545cf, 0xe9f9f910, 0x04020206, 0xfe7f7f81, 0xa05050f0, 0x783c3c44, 0x259f9fba, 0x4ba8a8e3, 0xa25151f3, 0x5da3a3fe, 0x804040c0, 0x058f8f8a, 0x3f9292ad, 0x219d9dbc, 0x70383848, 0xf1f5f504, 0x63bcbcdf, 0x77b6b6c1, 0xafdada75, 0x42212163, 0x20101030, 0xe5ffff1a, 0xfdf3f30e, 0xbfd2d26d, 0x81cdcd4c, 0x180c0c14, 0x26131335, 0xc3ecec2f, 0xbe5f5fe1, 0x359797a2, 0x884444cc, 0x2e171739, 0x93c4c457, 0x55a7a7f2, 0xfc7e7e82, 0x7a3d3d47, 0xc86464ac, 0xba5d5de7, 0x3219192b, 0xe6737395, 0xc06060a0, 0x19818198, 0x9e4f4fd1, 0xa3dcdc7f, 0x44222266, 0x542a2a7e, 0x3b9090ab, 0x0b888883, 0x8c4646ca, 0xc7eeee29, 0x6bb8b8d3, 0x2814143c, 0xa7dede79, 0xbc5e5ee2, 0x160b0b1d, 0xaddbdb76, 0xdbe0e03b, 0x64323256, 0x743a3a4e, 0x140a0a1e, 0x924949db, 0x0c06060a, 0x4824246c, 0xb85c5ce4, 0x9fc2c25d, 0xbdd3d36e, 0x43acacef, 0xc46262a6, 0x399191a8, 0x319595a4, 0xd3e4e437, 0xf279798b, 0xd5e7e732, 0x8bc8c843, 0x6e373759, 0xda6d6db7, 0x018d8d8c, 0xb1d5d564, 0x9c4e4ed2, 0x49a9a9e0, 0xd86c6cb4, 0xac5656fa, 0xf3f4f407, 0xcfeaea25, 0xca6565af, 0xf47a7a8e, 0x47aeaee9, 0x10080818, 0x6fbabad5, 0xf0787888, 0x4a25256f, 0x5c2e2e72, 0x381c1c24, 0x57a6a6f1, 0x73b4b4c7, 0x97c6c651, 0xcbe8e823, 0xa1dddd7c, 0xe874749c, 0x3e1f1f21, 0x964b4bdd, 0x61bdbddc, 0x0d8b8b86, 0x0f8a8a85, 0xe0707090, 0x7c3e3e42, 0x71b5b5c4, 0xcc6666aa, 0x904848d8, 0x06030305, 0xf7f6f601, 0x1c0e0e12, 0xc26161a3, 0x6a35355f, 0xae5757f9, 0x69b9b9d0, 0x17868691, 0x99c1c158, 0x3a1d1d27, 0x279e9eb9, 0xd9e1e138, 0xebf8f813, 0x2b9898b3, 0x22111133, 0xd26969bb, 0xa9d9d970, 0x078e8e89, 0x339494a7, 0x2d9b9bb6, 0x3c1e1e22, 0x15878792, 0xc9e9e920, 0x87cece49, 0xaa5555ff, 0x50282878, 0xa5dfdf7a, 0x038c8c8f, 0x59a1a1f8, 0x09898980, 0x1a0d0d17, 0x65bfbfda, 0xd7e6e631, 0x844242c6, 0xd06868b8, 0x824141c3, 0x299999b0, 0x5a2d2d77, 0x1e0f0f11, 0x7bb0b0cb, 0xa85454fc, 0x6dbbbbd6, 0x2c16163a];
-           var T2 = [0xa5c66363, 0x84f87c7c, 0x99ee7777, 0x8df67b7b, 0x0dfff2f2, 0xbdd66b6b, 0xb1de6f6f, 0x5491c5c5, 0x50603030, 0x03020101, 0xa9ce6767, 0x7d562b2b, 0x19e7fefe, 0x62b5d7d7, 0xe64dabab, 0x9aec7676, 0x458fcaca, 0x9d1f8282, 0x4089c9c9, 0x87fa7d7d, 0x15effafa, 0xebb25959, 0xc98e4747, 0x0bfbf0f0, 0xec41adad, 0x67b3d4d4, 0xfd5fa2a2, 0xea45afaf, 0xbf239c9c, 0xf753a4a4, 0x96e47272, 0x5b9bc0c0, 0xc275b7b7, 0x1ce1fdfd, 0xae3d9393, 0x6a4c2626, 0x5a6c3636, 0x417e3f3f, 0x02f5f7f7, 0x4f83cccc, 0x5c683434, 0xf451a5a5, 0x34d1e5e5, 0x08f9f1f1, 0x93e27171, 0x73abd8d8, 0x53623131, 0x3f2a1515, 0x0c080404, 0x5295c7c7, 0x65462323, 0x5e9dc3c3, 0x28301818, 0xa1379696, 0x0f0a0505, 0xb52f9a9a, 0x090e0707, 0x36241212, 0x9b1b8080, 0x3ddfe2e2, 0x26cdebeb, 0x694e2727, 0xcd7fb2b2, 0x9fea7575, 0x1b120909, 0x9e1d8383, 0x74582c2c, 0x2e341a1a, 0x2d361b1b, 0xb2dc6e6e, 0xeeb45a5a, 0xfb5ba0a0, 0xf6a45252, 0x4d763b3b, 0x61b7d6d6, 0xce7db3b3, 0x7b522929, 0x3edde3e3, 0x715e2f2f, 0x97138484, 0xf5a65353, 0x68b9d1d1, 0x00000000, 0x2cc1eded, 0x60402020, 0x1fe3fcfc, 0xc879b1b1, 0xedb65b5b, 0xbed46a6a, 0x468dcbcb, 0xd967bebe, 0x4b723939, 0xde944a4a, 0xd4984c4c, 0xe8b05858, 0x4a85cfcf, 0x6bbbd0d0, 0x2ac5efef, 0xe54faaaa, 0x16edfbfb, 0xc5864343, 0xd79a4d4d, 0x55663333, 0x94118585, 0xcf8a4545, 0x10e9f9f9, 0x06040202, 0x81fe7f7f, 0xf0a05050, 0x44783c3c, 0xba259f9f, 0xe34ba8a8, 0xf3a25151, 0xfe5da3a3, 0xc0804040, 0x8a058f8f, 0xad3f9292, 0xbc219d9d, 0x48703838, 0x04f1f5f5, 0xdf63bcbc, 0xc177b6b6, 0x75afdada, 0x63422121, 0x30201010, 0x1ae5ffff, 0x0efdf3f3, 0x6dbfd2d2, 0x4c81cdcd, 0x14180c0c, 0x35261313, 0x2fc3ecec, 0xe1be5f5f, 0xa2359797, 0xcc884444, 0x392e1717, 0x5793c4c4, 0xf255a7a7, 0x82fc7e7e, 0x477a3d3d, 0xacc86464, 0xe7ba5d5d, 0x2b321919, 0x95e67373, 0xa0c06060, 0x98198181, 0xd19e4f4f, 0x7fa3dcdc, 0x66442222, 0x7e542a2a, 0xab3b9090, 0x830b8888, 0xca8c4646, 0x29c7eeee, 0xd36bb8b8, 0x3c281414, 0x79a7dede, 0xe2bc5e5e, 0x1d160b0b, 0x76addbdb, 0x3bdbe0e0, 0x56643232, 0x4e743a3a, 0x1e140a0a, 0xdb924949, 0x0a0c0606, 0x6c482424, 0xe4b85c5c, 0x5d9fc2c2, 0x6ebdd3d3, 0xef43acac, 0xa6c46262, 0xa8399191, 0xa4319595, 0x37d3e4e4, 0x8bf27979, 0x32d5e7e7, 0x438bc8c8, 0x596e3737, 0xb7da6d6d, 0x8c018d8d, 0x64b1d5d5, 0xd29c4e4e, 0xe049a9a9, 0xb4d86c6c, 0xfaac5656, 0x07f3f4f4, 0x25cfeaea, 0xafca6565, 0x8ef47a7a, 0xe947aeae, 0x18100808, 0xd56fbaba, 0x88f07878, 0x6f4a2525, 0x725c2e2e, 0x24381c1c, 0xf157a6a6, 0xc773b4b4, 0x5197c6c6, 0x23cbe8e8, 0x7ca1dddd, 0x9ce87474, 0x213e1f1f, 0xdd964b4b, 0xdc61bdbd, 0x860d8b8b, 0x850f8a8a, 0x90e07070, 0x427c3e3e, 0xc471b5b5, 0xaacc6666, 0xd8904848, 0x05060303, 0x01f7f6f6, 0x121c0e0e, 0xa3c26161, 0x5f6a3535, 0xf9ae5757, 0xd069b9b9, 0x91178686, 0x5899c1c1, 0x273a1d1d, 0xb9279e9e, 0x38d9e1e1, 0x13ebf8f8, 0xb32b9898, 0x33221111, 0xbbd26969, 0x70a9d9d9, 0x89078e8e, 0xa7339494, 0xb62d9b9b, 0x223c1e1e, 0x92158787, 0x20c9e9e9, 0x4987cece, 0xffaa5555, 0x78502828, 0x7aa5dfdf, 0x8f038c8c, 0xf859a1a1, 0x80098989, 0x171a0d0d, 0xda65bfbf, 0x31d7e6e6, 0xc6844242, 0xb8d06868, 0xc3824141, 0xb0299999, 0x775a2d2d, 0x111e0f0f, 0xcb7bb0b0, 0xfca85454, 0xd66dbbbb, 0x3a2c1616];
-           var T3 = [0x63a5c663, 0x7c84f87c, 0x7799ee77, 0x7b8df67b, 0xf20dfff2, 0x6bbdd66b, 0x6fb1de6f, 0xc55491c5, 0x30506030, 0x01030201, 0x67a9ce67, 0x2b7d562b, 0xfe19e7fe, 0xd762b5d7, 0xabe64dab, 0x769aec76, 0xca458fca, 0x829d1f82, 0xc94089c9, 0x7d87fa7d, 0xfa15effa, 0x59ebb259, 0x47c98e47, 0xf00bfbf0, 0xadec41ad, 0xd467b3d4, 0xa2fd5fa2, 0xafea45af, 0x9cbf239c, 0xa4f753a4, 0x7296e472, 0xc05b9bc0, 0xb7c275b7, 0xfd1ce1fd, 0x93ae3d93, 0x266a4c26, 0x365a6c36, 0x3f417e3f, 0xf702f5f7, 0xcc4f83cc, 0x345c6834, 0xa5f451a5, 0xe534d1e5, 0xf108f9f1, 0x7193e271, 0xd873abd8, 0x31536231, 0x153f2a15, 0x040c0804, 0xc75295c7, 0x23654623, 0xc35e9dc3, 0x18283018, 0x96a13796, 0x050f0a05, 0x9ab52f9a, 0x07090e07, 0x12362412, 0x809b1b80, 0xe23ddfe2, 0xeb26cdeb, 0x27694e27, 0xb2cd7fb2, 0x759fea75, 0x091b1209, 0x839e1d83, 0x2c74582c, 0x1a2e341a, 0x1b2d361b, 0x6eb2dc6e, 0x5aeeb45a, 0xa0fb5ba0, 0x52f6a452, 0x3b4d763b, 0xd661b7d6, 0xb3ce7db3, 0x297b5229, 0xe33edde3, 0x2f715e2f, 0x84971384, 0x53f5a653, 0xd168b9d1, 0x00000000, 0xed2cc1ed, 0x20604020, 0xfc1fe3fc, 0xb1c879b1, 0x5bedb65b, 0x6abed46a, 0xcb468dcb, 0xbed967be, 0x394b7239, 0x4ade944a, 0x4cd4984c, 0x58e8b058, 0xcf4a85cf, 0xd06bbbd0, 0xef2ac5ef, 0xaae54faa, 0xfb16edfb, 0x43c58643, 0x4dd79a4d, 0x33556633, 0x85941185, 0x45cf8a45, 0xf910e9f9, 0x02060402, 0x7f81fe7f, 0x50f0a050, 0x3c44783c, 0x9fba259f, 0xa8e34ba8, 0x51f3a251, 0xa3fe5da3, 0x40c08040, 0x8f8a058f, 0x92ad3f92, 0x9dbc219d, 0x38487038, 0xf504f1f5, 0xbcdf63bc, 0xb6c177b6, 0xda75afda, 0x21634221, 0x10302010, 0xff1ae5ff, 0xf30efdf3, 0xd26dbfd2, 0xcd4c81cd, 0x0c14180c, 0x13352613, 0xec2fc3ec, 0x5fe1be5f, 0x97a23597, 0x44cc8844, 0x17392e17, 0xc45793c4, 0xa7f255a7, 0x7e82fc7e, 0x3d477a3d, 0x64acc864, 0x5de7ba5d, 0x192b3219, 0x7395e673, 0x60a0c060, 0x81981981, 0x4fd19e4f, 0xdc7fa3dc, 0x22664422, 0x2a7e542a, 0x90ab3b90, 0x88830b88, 0x46ca8c46, 0xee29c7ee, 0xb8d36bb8, 0x143c2814, 0xde79a7de, 0x5ee2bc5e, 0x0b1d160b, 0xdb76addb, 0xe03bdbe0, 0x32566432, 0x3a4e743a, 0x0a1e140a, 0x49db9249, 0x060a0c06, 0x246c4824, 0x5ce4b85c, 0xc25d9fc2, 0xd36ebdd3, 0xacef43ac, 0x62a6c462, 0x91a83991, 0x95a43195, 0xe437d3e4, 0x798bf279, 0xe732d5e7, 0xc8438bc8, 0x37596e37, 0x6db7da6d, 0x8d8c018d, 0xd564b1d5, 0x4ed29c4e, 0xa9e049a9, 0x6cb4d86c, 0x56faac56, 0xf407f3f4, 0xea25cfea, 0x65afca65, 0x7a8ef47a, 0xaee947ae, 0x08181008, 0xbad56fba, 0x7888f078, 0x256f4a25, 0x2e725c2e, 0x1c24381c, 0xa6f157a6, 0xb4c773b4, 0xc65197c6, 0xe823cbe8, 0xdd7ca1dd, 0x749ce874, 0x1f213e1f, 0x4bdd964b, 0xbddc61bd, 0x8b860d8b, 0x8a850f8a, 0x7090e070, 0x3e427c3e, 0xb5c471b5, 0x66aacc66, 0x48d89048, 0x03050603, 0xf601f7f6, 0x0e121c0e, 0x61a3c261, 0x355f6a35, 0x57f9ae57, 0xb9d069b9, 0x86911786, 0xc15899c1, 0x1d273a1d, 0x9eb9279e, 0xe138d9e1, 0xf813ebf8, 0x98b32b98, 0x11332211, 0x69bbd269, 0xd970a9d9, 0x8e89078e, 0x94a73394, 0x9bb62d9b, 0x1e223c1e, 0x87921587, 0xe920c9e9, 0xce4987ce, 0x55ffaa55, 0x28785028, 0xdf7aa5df, 0x8c8f038c, 0xa1f859a1, 0x89800989, 0x0d171a0d, 0xbfda65bf, 0xe631d7e6, 0x42c68442, 0x68b8d068, 0x41c38241, 0x99b02999, 0x2d775a2d, 0x0f111e0f, 0xb0cb7bb0, 0x54fca854, 0xbbd66dbb, 0x163a2c16];
-           var T4 = [0x6363a5c6, 0x7c7c84f8, 0x777799ee, 0x7b7b8df6, 0xf2f20dff, 0x6b6bbdd6, 0x6f6fb1de, 0xc5c55491, 0x30305060, 0x01010302, 0x6767a9ce, 0x2b2b7d56, 0xfefe19e7, 0xd7d762b5, 0xababe64d, 0x76769aec, 0xcaca458f, 0x82829d1f, 0xc9c94089, 0x7d7d87fa, 0xfafa15ef, 0x5959ebb2, 0x4747c98e, 0xf0f00bfb, 0xadadec41, 0xd4d467b3, 0xa2a2fd5f, 0xafafea45, 0x9c9cbf23, 0xa4a4f753, 0x727296e4, 0xc0c05b9b, 0xb7b7c275, 0xfdfd1ce1, 0x9393ae3d, 0x26266a4c, 0x36365a6c, 0x3f3f417e, 0xf7f702f5, 0xcccc4f83, 0x34345c68, 0xa5a5f451, 0xe5e534d1, 0xf1f108f9, 0x717193e2, 0xd8d873ab, 0x31315362, 0x15153f2a, 0x04040c08, 0xc7c75295, 0x23236546, 0xc3c35e9d, 0x18182830, 0x9696a137, 0x05050f0a, 0x9a9ab52f, 0x0707090e, 0x12123624, 0x80809b1b, 0xe2e23ddf, 0xebeb26cd, 0x2727694e, 0xb2b2cd7f, 0x75759fea, 0x09091b12, 0x83839e1d, 0x2c2c7458, 0x1a1a2e34, 0x1b1b2d36, 0x6e6eb2dc, 0x5a5aeeb4, 0xa0a0fb5b, 0x5252f6a4, 0x3b3b4d76, 0xd6d661b7, 0xb3b3ce7d, 0x29297b52, 0xe3e33edd, 0x2f2f715e, 0x84849713, 0x5353f5a6, 0xd1d168b9, 0x00000000, 0xeded2cc1, 0x20206040, 0xfcfc1fe3, 0xb1b1c879, 0x5b5bedb6, 0x6a6abed4, 0xcbcb468d, 0xbebed967, 0x39394b72, 0x4a4ade94, 0x4c4cd498, 0x5858e8b0, 0xcfcf4a85, 0xd0d06bbb, 0xefef2ac5, 0xaaaae54f, 0xfbfb16ed, 0x4343c586, 0x4d4dd79a, 0x33335566, 0x85859411, 0x4545cf8a, 0xf9f910e9, 0x02020604, 0x7f7f81fe, 0x5050f0a0, 0x3c3c4478, 0x9f9fba25, 0xa8a8e34b, 0x5151f3a2, 0xa3a3fe5d, 0x4040c080, 0x8f8f8a05, 0x9292ad3f, 0x9d9dbc21, 0x38384870, 0xf5f504f1, 0xbcbcdf63, 0xb6b6c177, 0xdada75af, 0x21216342, 0x10103020, 0xffff1ae5, 0xf3f30efd, 0xd2d26dbf, 0xcdcd4c81, 0x0c0c1418, 0x13133526, 0xecec2fc3, 0x5f5fe1be, 0x9797a235, 0x4444cc88, 0x1717392e, 0xc4c45793, 0xa7a7f255, 0x7e7e82fc, 0x3d3d477a, 0x6464acc8, 0x5d5de7ba, 0x19192b32, 0x737395e6, 0x6060a0c0, 0x81819819, 0x4f4fd19e, 0xdcdc7fa3, 0x22226644, 0x2a2a7e54, 0x9090ab3b, 0x8888830b, 0x4646ca8c, 0xeeee29c7, 0xb8b8d36b, 0x14143c28, 0xdede79a7, 0x5e5ee2bc, 0x0b0b1d16, 0xdbdb76ad, 0xe0e03bdb, 0x32325664, 0x3a3a4e74, 0x0a0a1e14, 0x4949db92, 0x06060a0c, 0x24246c48, 0x5c5ce4b8, 0xc2c25d9f, 0xd3d36ebd, 0xacacef43, 0x6262a6c4, 0x9191a839, 0x9595a431, 0xe4e437d3, 0x79798bf2, 0xe7e732d5, 0xc8c8438b, 0x3737596e, 0x6d6db7da, 0x8d8d8c01, 0xd5d564b1, 0x4e4ed29c, 0xa9a9e049, 0x6c6cb4d8, 0x5656faac, 0xf4f407f3, 0xeaea25cf, 0x6565afca, 0x7a7a8ef4, 0xaeaee947, 0x08081810, 0xbabad56f, 0x787888f0, 0x25256f4a, 0x2e2e725c, 0x1c1c2438, 0xa6a6f157, 0xb4b4c773, 0xc6c65197, 0xe8e823cb, 0xdddd7ca1, 0x74749ce8, 0x1f1f213e, 0x4b4bdd96, 0xbdbddc61, 0x8b8b860d, 0x8a8a850f, 0x707090e0, 0x3e3e427c, 0xb5b5c471, 0x6666aacc, 0x4848d890, 0x03030506, 0xf6f601f7, 0x0e0e121c, 0x6161a3c2, 0x35355f6a, 0x5757f9ae, 0xb9b9d069, 0x86869117, 0xc1c15899, 0x1d1d273a, 0x9e9eb927, 0xe1e138d9, 0xf8f813eb, 0x9898b32b, 0x11113322, 0x6969bbd2, 0xd9d970a9, 0x8e8e8907, 0x9494a733, 0x9b9bb62d, 0x1e1e223c, 0x87879215, 0xe9e920c9, 0xcece4987, 0x5555ffaa, 0x28287850, 0xdfdf7aa5, 0x8c8c8f03, 0xa1a1f859, 0x89898009, 0x0d0d171a, 0xbfbfda65, 0xe6e631d7, 0x4242c684, 0x6868b8d0, 0x4141c382, 0x9999b029, 0x2d2d775a, 0x0f0f111e, 0xb0b0cb7b, 0x5454fca8, 0xbbbbd66d, 0x16163a2c];
-
-           // Transformations for decryption
-           var T5 = [0x51f4a750, 0x7e416553, 0x1a17a4c3, 0x3a275e96, 0x3bab6bcb, 0x1f9d45f1, 0xacfa58ab, 0x4be30393, 0x2030fa55, 0xad766df6, 0x88cc7691, 0xf5024c25, 0x4fe5d7fc, 0xc52acbd7, 0x26354480, 0xb562a38f, 0xdeb15a49, 0x25ba1b67, 0x45ea0e98, 0x5dfec0e1, 0xc32f7502, 0x814cf012, 0x8d4697a3, 0x6bd3f9c6, 0x038f5fe7, 0x15929c95, 0xbf6d7aeb, 0x955259da, 0xd4be832d, 0x587421d3, 0x49e06929, 0x8ec9c844, 0x75c2896a, 0xf48e7978, 0x99583e6b, 0x27b971dd, 0xbee14fb6, 0xf088ad17, 0xc920ac66, 0x7dce3ab4, 0x63df4a18, 0xe51a3182, 0x97513360, 0x62537f45, 0xb16477e0, 0xbb6bae84, 0xfe81a01c, 0xf9082b94, 0x70486858, 0x8f45fd19, 0x94de6c87, 0x527bf8b7, 0xab73d323, 0x724b02e2, 0xe31f8f57, 0x6655ab2a, 0xb2eb2807, 0x2fb5c203, 0x86c57b9a, 0xd33708a5, 0x302887f2, 0x23bfa5b2, 0x02036aba, 0xed16825c, 0x8acf1c2b, 0xa779b492, 0xf307f2f0, 0x4e69e2a1, 0x65daf4cd, 0x0605bed5, 0xd134621f, 0xc4a6fe8a, 0x342e539d, 0xa2f355a0, 0x058ae132, 0xa4f6eb75, 0x0b83ec39, 0x4060efaa, 0x5e719f06, 0xbd6e1051, 0x3e218af9, 0x96dd063d, 0xdd3e05ae, 0x4de6bd46, 0x91548db5, 0x71c45d05, 0x0406d46f, 0x605015ff, 0x1998fb24, 0xd6bde997, 0x894043cc, 0x67d99e77, 0xb0e842bd, 0x07898b88, 0xe7195b38, 0x79c8eedb, 0xa17c0a47, 0x7c420fe9, 0xf8841ec9, 0x00000000, 0x09808683, 0x322bed48, 0x1e1170ac, 0x6c5a724e, 0xfd0efffb, 0x0f853856, 0x3daed51e, 0x362d3927, 0x0a0fd964, 0x685ca621, 0x9b5b54d1, 0x24362e3a, 0x0c0a67b1, 0x9357e70f, 0xb4ee96d2, 0x1b9b919e, 0x80c0c54f, 0x61dc20a2, 0x5a774b69, 0x1c121a16, 0xe293ba0a, 0xc0a02ae5, 0x3c22e043, 0x121b171d, 0x0e090d0b, 0xf28bc7ad, 0x2db6a8b9, 0x141ea9c8, 0x57f11985, 0xaf75074c, 0xee99ddbb, 0xa37f60fd, 0xf701269f, 0x5c72f5bc, 0x44663bc5, 0x5bfb7e34, 0x8b432976, 0xcb23c6dc, 0xb6edfc68, 0xb8e4f163, 0xd731dcca, 0x42638510, 0x13972240, 0x84c61120, 0x854a247d, 0xd2bb3df8, 0xaef93211, 0xc729a16d, 0x1d9e2f4b, 0xdcb230f3, 0x0d8652ec, 0x77c1e3d0, 0x2bb3166c, 0xa970b999, 0x119448fa, 0x47e96422, 0xa8fc8cc4, 0xa0f03f1a, 0x567d2cd8, 0x223390ef, 0x87494ec7, 0xd938d1c1, 0x8ccaa2fe, 0x98d40b36, 0xa6f581cf, 0xa57ade28, 0xdab78e26, 0x3fadbfa4, 0x2c3a9de4, 0x5078920d, 0x6a5fcc9b, 0x547e4662, 0xf68d13c2, 0x90d8b8e8, 0x2e39f75e, 0x82c3aff5, 0x9f5d80be, 0x69d0937c, 0x6fd52da9, 0xcf2512b3, 0xc8ac993b, 0x10187da7, 0xe89c636e, 0xdb3bbb7b, 0xcd267809, 0x6e5918f4, 0xec9ab701, 0x834f9aa8, 0xe6956e65, 0xaaffe67e, 0x21bccf08, 0xef15e8e6, 0xbae79bd9, 0x4a6f36ce, 0xea9f09d4, 0x29b07cd6, 0x31a4b2af, 0x2a3f2331, 0xc6a59430, 0x35a266c0, 0x744ebc37, 0xfc82caa6, 0xe090d0b0, 0x33a7d815, 0xf104984a, 0x41ecdaf7, 0x7fcd500e, 0x1791f62f, 0x764dd68d, 0x43efb04d, 0xccaa4d54, 0xe49604df, 0x9ed1b5e3, 0x4c6a881b, 0xc12c1fb8, 0x4665517f, 0x9d5eea04, 0x018c355d, 0xfa877473, 0xfb0b412e, 0xb3671d5a, 0x92dbd252, 0xe9105633, 0x6dd64713, 0x9ad7618c, 0x37a10c7a, 0x59f8148e, 0xeb133c89, 0xcea927ee, 0xb761c935, 0xe11ce5ed, 0x7a47b13c, 0x9cd2df59, 0x55f2733f, 0x1814ce79, 0x73c737bf, 0x53f7cdea, 0x5ffdaa5b, 0xdf3d6f14, 0x7844db86, 0xcaaff381, 0xb968c43e, 0x3824342c, 0xc2a3405f, 0x161dc372, 0xbce2250c, 0x283c498b, 0xff0d9541, 0x39a80171, 0x080cb3de, 0xd8b4e49c, 0x6456c190, 0x7bcb8461, 0xd532b670, 0x486c5c74, 0xd0b85742];
-           var T6 = [0x5051f4a7, 0x537e4165, 0xc31a17a4, 0x963a275e, 0xcb3bab6b, 0xf11f9d45, 0xabacfa58, 0x934be303, 0x552030fa, 0xf6ad766d, 0x9188cc76, 0x25f5024c, 0xfc4fe5d7, 0xd7c52acb, 0x80263544, 0x8fb562a3, 0x49deb15a, 0x6725ba1b, 0x9845ea0e, 0xe15dfec0, 0x02c32f75, 0x12814cf0, 0xa38d4697, 0xc66bd3f9, 0xe7038f5f, 0x9515929c, 0xebbf6d7a, 0xda955259, 0x2dd4be83, 0xd3587421, 0x2949e069, 0x448ec9c8, 0x6a75c289, 0x78f48e79, 0x6b99583e, 0xdd27b971, 0xb6bee14f, 0x17f088ad, 0x66c920ac, 0xb47dce3a, 0x1863df4a, 0x82e51a31, 0x60975133, 0x4562537f, 0xe0b16477, 0x84bb6bae, 0x1cfe81a0, 0x94f9082b, 0x58704868, 0x198f45fd, 0x8794de6c, 0xb7527bf8, 0x23ab73d3, 0xe2724b02, 0x57e31f8f, 0x2a6655ab, 0x07b2eb28, 0x032fb5c2, 0x9a86c57b, 0xa5d33708, 0xf2302887, 0xb223bfa5, 0xba02036a, 0x5ced1682, 0x2b8acf1c, 0x92a779b4, 0xf0f307f2, 0xa14e69e2, 0xcd65daf4, 0xd50605be, 0x1fd13462, 0x8ac4a6fe, 0x9d342e53, 0xa0a2f355, 0x32058ae1, 0x75a4f6eb, 0x390b83ec, 0xaa4060ef, 0x065e719f, 0x51bd6e10, 0xf93e218a, 0x3d96dd06, 0xaedd3e05, 0x464de6bd, 0xb591548d, 0x0571c45d, 0x6f0406d4, 0xff605015, 0x241998fb, 0x97d6bde9, 0xcc894043, 0x7767d99e, 0xbdb0e842, 0x8807898b, 0x38e7195b, 0xdb79c8ee, 0x47a17c0a, 0xe97c420f, 0xc9f8841e, 0x00000000, 0x83098086, 0x48322bed, 0xac1e1170, 0x4e6c5a72, 0xfbfd0eff, 0x560f8538, 0x1e3daed5, 0x27362d39, 0x640a0fd9, 0x21685ca6, 0xd19b5b54, 0x3a24362e, 0xb10c0a67, 0x0f9357e7, 0xd2b4ee96, 0x9e1b9b91, 0x4f80c0c5, 0xa261dc20, 0x695a774b, 0x161c121a, 0x0ae293ba, 0xe5c0a02a, 0x433c22e0, 0x1d121b17, 0x0b0e090d, 0xadf28bc7, 0xb92db6a8, 0xc8141ea9, 0x8557f119, 0x4caf7507, 0xbbee99dd, 0xfda37f60, 0x9ff70126, 0xbc5c72f5, 0xc544663b, 0x345bfb7e, 0x768b4329, 0xdccb23c6, 0x68b6edfc, 0x63b8e4f1, 0xcad731dc, 0x10426385, 0x40139722, 0x2084c611, 0x7d854a24, 0xf8d2bb3d, 0x11aef932, 0x6dc729a1, 0x4b1d9e2f, 0xf3dcb230, 0xec0d8652, 0xd077c1e3, 0x6c2bb316, 0x99a970b9, 0xfa119448, 0x2247e964, 0xc4a8fc8c, 0x1aa0f03f, 0xd8567d2c, 0xef223390, 0xc787494e, 0xc1d938d1, 0xfe8ccaa2, 0x3698d40b, 0xcfa6f581, 0x28a57ade, 0x26dab78e, 0xa43fadbf, 0xe42c3a9d, 0x0d507892, 0x9b6a5fcc, 0x62547e46, 0xc2f68d13, 0xe890d8b8, 0x5e2e39f7, 0xf582c3af, 0xbe9f5d80, 0x7c69d093, 0xa96fd52d, 0xb3cf2512, 0x3bc8ac99, 0xa710187d, 0x6ee89c63, 0x7bdb3bbb, 0x09cd2678, 0xf46e5918, 0x01ec9ab7, 0xa8834f9a, 0x65e6956e, 0x7eaaffe6, 0x0821bccf, 0xe6ef15e8, 0xd9bae79b, 0xce4a6f36, 0xd4ea9f09, 0xd629b07c, 0xaf31a4b2, 0x312a3f23, 0x30c6a594, 0xc035a266, 0x37744ebc, 0xa6fc82ca, 0xb0e090d0, 0x1533a7d8, 0x4af10498, 0xf741ecda, 0x0e7fcd50, 0x2f1791f6, 0x8d764dd6, 0x4d43efb0, 0x54ccaa4d, 0xdfe49604, 0xe39ed1b5, 0x1b4c6a88, 0xb8c12c1f, 0x7f466551, 0x049d5eea, 0x5d018c35, 0x73fa8774, 0x2efb0b41, 0x5ab3671d, 0x5292dbd2, 0x33e91056, 0x136dd647, 0x8c9ad761, 0x7a37a10c, 0x8e59f814, 0x89eb133c, 0xeecea927, 0x35b761c9, 0xede11ce5, 0x3c7a47b1, 0x599cd2df, 0x3f55f273, 0x791814ce, 0xbf73c737, 0xea53f7cd, 0x5b5ffdaa, 0x14df3d6f, 0x867844db, 0x81caaff3, 0x3eb968c4, 0x2c382434, 0x5fc2a340, 0x72161dc3, 0x0cbce225, 0x8b283c49, 0x41ff0d95, 0x7139a801, 0xde080cb3, 0x9cd8b4e4, 0x906456c1, 0x617bcb84, 0x70d532b6, 0x74486c5c, 0x42d0b857];
-           var T7 = [0xa75051f4, 0x65537e41, 0xa4c31a17, 0x5e963a27, 0x6bcb3bab, 0x45f11f9d, 0x58abacfa, 0x03934be3, 0xfa552030, 0x6df6ad76, 0x769188cc, 0x4c25f502, 0xd7fc4fe5, 0xcbd7c52a, 0x44802635, 0xa38fb562, 0x5a49deb1, 0x1b6725ba, 0x0e9845ea, 0xc0e15dfe, 0x7502c32f, 0xf012814c, 0x97a38d46, 0xf9c66bd3, 0x5fe7038f, 0x9c951592, 0x7aebbf6d, 0x59da9552, 0x832dd4be, 0x21d35874, 0x692949e0, 0xc8448ec9, 0x896a75c2, 0x7978f48e, 0x3e6b9958, 0x71dd27b9, 0x4fb6bee1, 0xad17f088, 0xac66c920, 0x3ab47dce, 0x4a1863df, 0x3182e51a, 0x33609751, 0x7f456253, 0x77e0b164, 0xae84bb6b, 0xa01cfe81, 0x2b94f908, 0x68587048, 0xfd198f45, 0x6c8794de, 0xf8b7527b, 0xd323ab73, 0x02e2724b, 0x8f57e31f, 0xab2a6655, 0x2807b2eb, 0xc2032fb5, 0x7b9a86c5, 0x08a5d337, 0x87f23028, 0xa5b223bf, 0x6aba0203, 0x825ced16, 0x1c2b8acf, 0xb492a779, 0xf2f0f307, 0xe2a14e69, 0xf4cd65da, 0xbed50605, 0x621fd134, 0xfe8ac4a6, 0x539d342e, 0x55a0a2f3, 0xe132058a, 0xeb75a4f6, 0xec390b83, 0xefaa4060, 0x9f065e71, 0x1051bd6e, 0x8af93e21, 0x063d96dd, 0x05aedd3e, 0xbd464de6, 0x8db59154, 0x5d0571c4, 0xd46f0406, 0x15ff6050, 0xfb241998, 0xe997d6bd, 0x43cc8940, 0x9e7767d9, 0x42bdb0e8, 0x8b880789, 0x5b38e719, 0xeedb79c8, 0x0a47a17c, 0x0fe97c42, 0x1ec9f884, 0x00000000, 0x86830980, 0xed48322b, 0x70ac1e11, 0x724e6c5a, 0xfffbfd0e, 0x38560f85, 0xd51e3dae, 0x3927362d, 0xd9640a0f, 0xa621685c, 0x54d19b5b, 0x2e3a2436, 0x67b10c0a, 0xe70f9357, 0x96d2b4ee, 0x919e1b9b, 0xc54f80c0, 0x20a261dc, 0x4b695a77, 0x1a161c12, 0xba0ae293, 0x2ae5c0a0, 0xe0433c22, 0x171d121b, 0x0d0b0e09, 0xc7adf28b, 0xa8b92db6, 0xa9c8141e, 0x198557f1, 0x074caf75, 0xddbbee99, 0x60fda37f, 0x269ff701, 0xf5bc5c72, 0x3bc54466, 0x7e345bfb, 0x29768b43, 0xc6dccb23, 0xfc68b6ed, 0xf163b8e4, 0xdccad731, 0x85104263, 0x22401397, 0x112084c6, 0x247d854a, 0x3df8d2bb, 0x3211aef9, 0xa16dc729, 0x2f4b1d9e, 0x30f3dcb2, 0x52ec0d86, 0xe3d077c1, 0x166c2bb3, 0xb999a970, 0x48fa1194, 0x642247e9, 0x8cc4a8fc, 0x3f1aa0f0, 0x2cd8567d, 0x90ef2233, 0x4ec78749, 0xd1c1d938, 0xa2fe8cca, 0x0b3698d4, 0x81cfa6f5, 0xde28a57a, 0x8e26dab7, 0xbfa43fad, 0x9de42c3a, 0x920d5078, 0xcc9b6a5f, 0x4662547e, 0x13c2f68d, 0xb8e890d8, 0xf75e2e39, 0xaff582c3, 0x80be9f5d, 0x937c69d0, 0x2da96fd5, 0x12b3cf25, 0x993bc8ac, 0x7da71018, 0x636ee89c, 0xbb7bdb3b, 0x7809cd26, 0x18f46e59, 0xb701ec9a, 0x9aa8834f, 0x6e65e695, 0xe67eaaff, 0xcf0821bc, 0xe8e6ef15, 0x9bd9bae7, 0x36ce4a6f, 0x09d4ea9f, 0x7cd629b0, 0xb2af31a4, 0x23312a3f, 0x9430c6a5, 0x66c035a2, 0xbc37744e, 0xcaa6fc82, 0xd0b0e090, 0xd81533a7, 0x984af104, 0xdaf741ec, 0x500e7fcd, 0xf62f1791, 0xd68d764d, 0xb04d43ef, 0x4d54ccaa, 0x04dfe496, 0xb5e39ed1, 0x881b4c6a, 0x1fb8c12c, 0x517f4665, 0xea049d5e, 0x355d018c, 0x7473fa87, 0x412efb0b, 0x1d5ab367, 0xd25292db, 0x5633e910, 0x47136dd6, 0x618c9ad7, 0x0c7a37a1, 0x148e59f8, 0x3c89eb13, 0x27eecea9, 0xc935b761, 0xe5ede11c, 0xb13c7a47, 0xdf599cd2, 0x733f55f2, 0xce791814, 0x37bf73c7, 0xcdea53f7, 0xaa5b5ffd, 0x6f14df3d, 0xdb867844, 0xf381caaf, 0xc43eb968, 0x342c3824, 0x405fc2a3, 0xc372161d, 0x250cbce2, 0x498b283c, 0x9541ff0d, 0x017139a8, 0xb3de080c, 0xe49cd8b4, 0xc1906456, 0x84617bcb, 0xb670d532, 0x5c74486c, 0x5742d0b8];
-           var T8 = [0xf4a75051, 0x4165537e, 0x17a4c31a, 0x275e963a, 0xab6bcb3b, 0x9d45f11f, 0xfa58abac, 0xe303934b, 0x30fa5520, 0x766df6ad, 0xcc769188, 0x024c25f5, 0xe5d7fc4f, 0x2acbd7c5, 0x35448026, 0x62a38fb5, 0xb15a49de, 0xba1b6725, 0xea0e9845, 0xfec0e15d, 0x2f7502c3, 0x4cf01281, 0x4697a38d, 0xd3f9c66b, 0x8f5fe703, 0x929c9515, 0x6d7aebbf, 0x5259da95, 0xbe832dd4, 0x7421d358, 0xe0692949, 0xc9c8448e, 0xc2896a75, 0x8e7978f4, 0x583e6b99, 0xb971dd27, 0xe14fb6be, 0x88ad17f0, 0x20ac66c9, 0xce3ab47d, 0xdf4a1863, 0x1a3182e5, 0x51336097, 0x537f4562, 0x6477e0b1, 0x6bae84bb, 0x81a01cfe, 0x082b94f9, 0x48685870, 0x45fd198f, 0xde6c8794, 0x7bf8b752, 0x73d323ab, 0x4b02e272, 0x1f8f57e3, 0x55ab2a66, 0xeb2807b2, 0xb5c2032f, 0xc57b9a86, 0x3708a5d3, 0x2887f230, 0xbfa5b223, 0x036aba02, 0x16825ced, 0xcf1c2b8a, 0x79b492a7, 0x07f2f0f3, 0x69e2a14e, 0xdaf4cd65, 0x05bed506, 0x34621fd1, 0xa6fe8ac4, 0x2e539d34, 0xf355a0a2, 0x8ae13205, 0xf6eb75a4, 0x83ec390b, 0x60efaa40, 0x719f065e, 0x6e1051bd, 0x218af93e, 0xdd063d96, 0x3e05aedd, 0xe6bd464d, 0x548db591, 0xc45d0571, 0x06d46f04, 0x5015ff60, 0x98fb2419, 0xbde997d6, 0x4043cc89, 0xd99e7767, 0xe842bdb0, 0x898b8807, 0x195b38e7, 0xc8eedb79, 0x7c0a47a1, 0x420fe97c, 0x841ec9f8, 0x00000000, 0x80868309, 0x2bed4832, 0x1170ac1e, 0x5a724e6c, 0x0efffbfd, 0x8538560f, 0xaed51e3d, 0x2d392736, 0x0fd9640a, 0x5ca62168, 0x5b54d19b, 0x362e3a24, 0x0a67b10c, 0x57e70f93, 0xee96d2b4, 0x9b919e1b, 0xc0c54f80, 0xdc20a261, 0x774b695a, 0x121a161c, 0x93ba0ae2, 0xa02ae5c0, 0x22e0433c, 0x1b171d12, 0x090d0b0e, 0x8bc7adf2, 0xb6a8b92d, 0x1ea9c814, 0xf1198557, 0x75074caf, 0x99ddbbee, 0x7f60fda3, 0x01269ff7, 0x72f5bc5c, 0x663bc544, 0xfb7e345b, 0x4329768b, 0x23c6dccb, 0xedfc68b6, 0xe4f163b8, 0x31dccad7, 0x63851042, 0x97224013, 0xc6112084, 0x4a247d85, 0xbb3df8d2, 0xf93211ae, 0x29a16dc7, 0x9e2f4b1d, 0xb230f3dc, 0x8652ec0d, 0xc1e3d077, 0xb3166c2b, 0x70b999a9, 0x9448fa11, 0xe9642247, 0xfc8cc4a8, 0xf03f1aa0, 0x7d2cd856, 0x3390ef22, 0x494ec787, 0x38d1c1d9, 0xcaa2fe8c, 0xd40b3698, 0xf581cfa6, 0x7ade28a5, 0xb78e26da, 0xadbfa43f, 0x3a9de42c, 0x78920d50, 0x5fcc9b6a, 0x7e466254, 0x8d13c2f6, 0xd8b8e890, 0x39f75e2e, 0xc3aff582, 0x5d80be9f, 0xd0937c69, 0xd52da96f, 0x2512b3cf, 0xac993bc8, 0x187da710, 0x9c636ee8, 0x3bbb7bdb, 0x267809cd, 0x5918f46e, 0x9ab701ec, 0x4f9aa883, 0x956e65e6, 0xffe67eaa, 0xbccf0821, 0x15e8e6ef, 0xe79bd9ba, 0x6f36ce4a, 0x9f09d4ea, 0xb07cd629, 0xa4b2af31, 0x3f23312a, 0xa59430c6, 0xa266c035, 0x4ebc3774, 0x82caa6fc, 0x90d0b0e0, 0xa7d81533, 0x04984af1, 0xecdaf741, 0xcd500e7f, 0x91f62f17, 0x4dd68d76, 0xefb04d43, 0xaa4d54cc, 0x9604dfe4, 0xd1b5e39e, 0x6a881b4c, 0x2c1fb8c1, 0x65517f46, 0x5eea049d, 0x8c355d01, 0x877473fa, 0x0b412efb, 0x671d5ab3, 0xdbd25292, 0x105633e9, 0xd647136d, 0xd7618c9a, 0xa10c7a37, 0xf8148e59, 0x133c89eb, 0xa927eece, 0x61c935b7, 0x1ce5ede1, 0x47b13c7a, 0xd2df599c, 0xf2733f55, 0x14ce7918, 0xc737bf73, 0xf7cdea53, 0xfdaa5b5f, 0x3d6f14df, 0x44db8678, 0xaff381ca, 0x68c43eb9, 0x24342c38, 0xa3405fc2, 0x1dc37216, 0xe2250cbc, 0x3c498b28, 0x0d9541ff, 0xa8017139, 0x0cb3de08, 0xb4e49cd8, 0x56c19064, 0xcb84617b, 0x32b670d5, 0x6c5c7448, 0xb85742d0];
-
-           // Transformations for decryption key expansion
-           var U1 = [0x00000000, 0x0e090d0b, 0x1c121a16, 0x121b171d, 0x3824342c, 0x362d3927, 0x24362e3a, 0x2a3f2331, 0x70486858, 0x7e416553, 0x6c5a724e, 0x62537f45, 0x486c5c74, 0x4665517f, 0x547e4662, 0x5a774b69, 0xe090d0b0, 0xee99ddbb, 0xfc82caa6, 0xf28bc7ad, 0xd8b4e49c, 0xd6bde997, 0xc4a6fe8a, 0xcaaff381, 0x90d8b8e8, 0x9ed1b5e3, 0x8ccaa2fe, 0x82c3aff5, 0xa8fc8cc4, 0xa6f581cf, 0xb4ee96d2, 0xbae79bd9, 0xdb3bbb7b, 0xd532b670, 0xc729a16d, 0xc920ac66, 0xe31f8f57, 0xed16825c, 0xff0d9541, 0xf104984a, 0xab73d323, 0xa57ade28, 0xb761c935, 0xb968c43e, 0x9357e70f, 0x9d5eea04, 0x8f45fd19, 0x814cf012, 0x3bab6bcb, 0x35a266c0, 0x27b971dd, 0x29b07cd6, 0x038f5fe7, 0x0d8652ec, 0x1f9d45f1, 0x119448fa, 0x4be30393, 0x45ea0e98, 0x57f11985, 0x59f8148e, 0x73c737bf, 0x7dce3ab4, 0x6fd52da9, 0x61dc20a2, 0xad766df6, 0xa37f60fd, 0xb16477e0, 0xbf6d7aeb, 0x955259da, 0x9b5b54d1, 0x894043cc, 0x87494ec7, 0xdd3e05ae, 0xd33708a5, 0xc12c1fb8, 0xcf2512b3, 0xe51a3182, 0xeb133c89, 0xf9082b94, 0xf701269f, 0x4de6bd46, 0x43efb04d, 0x51f4a750, 0x5ffdaa5b, 0x75c2896a, 0x7bcb8461, 0x69d0937c, 0x67d99e77, 0x3daed51e, 0x33a7d815, 0x21bccf08, 0x2fb5c203, 0x058ae132, 0x0b83ec39, 0x1998fb24, 0x1791f62f, 0x764dd68d, 0x7844db86, 0x6a5fcc9b, 0x6456c190, 0x4e69e2a1, 0x4060efaa, 0x527bf8b7, 0x5c72f5bc, 0x0605bed5, 0x080cb3de, 0x1a17a4c3, 0x141ea9c8, 0x3e218af9, 0x302887f2, 0x223390ef, 0x2c3a9de4, 0x96dd063d, 0x98d40b36, 0x8acf1c2b, 0x84c61120, 0xaef93211, 0xa0f03f1a, 0xb2eb2807, 0xbce2250c, 0xe6956e65, 0xe89c636e, 0xfa877473, 0xf48e7978, 0xdeb15a49, 0xd0b85742, 0xc2a3405f, 0xccaa4d54, 0x41ecdaf7, 0x4fe5d7fc, 0x5dfec0e1, 0x53f7cdea, 0x79c8eedb, 0x77c1e3d0, 0x65daf4cd, 0x6bd3f9c6, 0x31a4b2af, 0x3fadbfa4, 0x2db6a8b9, 0x23bfa5b2, 0x09808683, 0x07898b88, 0x15929c95, 0x1b9b919e, 0xa17c0a47, 0xaf75074c, 0xbd6e1051, 0xb3671d5a, 0x99583e6b, 0x97513360, 0x854a247d, 0x8b432976, 0xd134621f, 0xdf3d6f14, 0xcd267809, 0xc32f7502, 0xe9105633, 0xe7195b38, 0xf5024c25, 0xfb0b412e, 0x9ad7618c, 0x94de6c87, 0x86c57b9a, 0x88cc7691, 0xa2f355a0, 0xacfa58ab, 0xbee14fb6, 0xb0e842bd, 0xea9f09d4, 0xe49604df, 0xf68d13c2, 0xf8841ec9, 0xd2bb3df8, 0xdcb230f3, 0xcea927ee, 0xc0a02ae5, 0x7a47b13c, 0x744ebc37, 0x6655ab2a, 0x685ca621, 0x42638510, 0x4c6a881b, 0x5e719f06, 0x5078920d, 0x0a0fd964, 0x0406d46f, 0x161dc372, 0x1814ce79, 0x322bed48, 0x3c22e043, 0x2e39f75e, 0x2030fa55, 0xec9ab701, 0xe293ba0a, 0xf088ad17, 0xfe81a01c, 0xd4be832d, 0xdab78e26, 0xc8ac993b, 0xc6a59430, 0x9cd2df59, 0x92dbd252, 0x80c0c54f, 0x8ec9c844, 0xa4f6eb75, 0xaaffe67e, 0xb8e4f163, 0xb6edfc68, 0x0c0a67b1, 0x02036aba, 0x10187da7, 0x1e1170ac, 0x342e539d, 0x3a275e96, 0x283c498b, 0x26354480, 0x7c420fe9, 0x724b02e2, 0x605015ff, 0x6e5918f4, 0x44663bc5, 0x4a6f36ce, 0x587421d3, 0x567d2cd8, 0x37a10c7a, 0x39a80171, 0x2bb3166c, 0x25ba1b67, 0x0f853856, 0x018c355d, 0x13972240, 0x1d9e2f4b, 0x47e96422, 0x49e06929, 0x5bfb7e34, 0x55f2733f, 0x7fcd500e, 0x71c45d05, 0x63df4a18, 0x6dd64713, 0xd731dcca, 0xd938d1c1, 0xcb23c6dc, 0xc52acbd7, 0xef15e8e6, 0xe11ce5ed, 0xf307f2f0, 0xfd0efffb, 0xa779b492, 0xa970b999, 0xbb6bae84, 0xb562a38f, 0x9f5d80be, 0x91548db5, 0x834f9aa8, 0x8d4697a3];
-           var U2 = [0x00000000, 0x0b0e090d, 0x161c121a, 0x1d121b17, 0x2c382434, 0x27362d39, 0x3a24362e, 0x312a3f23, 0x58704868, 0x537e4165, 0x4e6c5a72, 0x4562537f, 0x74486c5c, 0x7f466551, 0x62547e46, 0x695a774b, 0xb0e090d0, 0xbbee99dd, 0xa6fc82ca, 0xadf28bc7, 0x9cd8b4e4, 0x97d6bde9, 0x8ac4a6fe, 0x81caaff3, 0xe890d8b8, 0xe39ed1b5, 0xfe8ccaa2, 0xf582c3af, 0xc4a8fc8c, 0xcfa6f581, 0xd2b4ee96, 0xd9bae79b, 0x7bdb3bbb, 0x70d532b6, 0x6dc729a1, 0x66c920ac, 0x57e31f8f, 0x5ced1682, 0x41ff0d95, 0x4af10498, 0x23ab73d3, 0x28a57ade, 0x35b761c9, 0x3eb968c4, 0x0f9357e7, 0x049d5eea, 0x198f45fd, 0x12814cf0, 0xcb3bab6b, 0xc035a266, 0xdd27b971, 0xd629b07c, 0xe7038f5f, 0xec0d8652, 0xf11f9d45, 0xfa119448, 0x934be303, 0x9845ea0e, 0x8557f119, 0x8e59f814, 0xbf73c737, 0xb47dce3a, 0xa96fd52d, 0xa261dc20, 0xf6ad766d, 0xfda37f60, 0xe0b16477, 0xebbf6d7a, 0xda955259, 0xd19b5b54, 0xcc894043, 0xc787494e, 0xaedd3e05, 0xa5d33708, 0xb8c12c1f, 0xb3cf2512, 0x82e51a31, 0x89eb133c, 0x94f9082b, 0x9ff70126, 0x464de6bd, 0x4d43efb0, 0x5051f4a7, 0x5b5ffdaa, 0x6a75c289, 0x617bcb84, 0x7c69d093, 0x7767d99e, 0x1e3daed5, 0x1533a7d8, 0x0821bccf, 0x032fb5c2, 0x32058ae1, 0x390b83ec, 0x241998fb, 0x2f1791f6, 0x8d764dd6, 0x867844db, 0x9b6a5fcc, 0x906456c1, 0xa14e69e2, 0xaa4060ef, 0xb7527bf8, 0xbc5c72f5, 0xd50605be, 0xde080cb3, 0xc31a17a4, 0xc8141ea9, 0xf93e218a, 0xf2302887, 0xef223390, 0xe42c3a9d, 0x3d96dd06, 0x3698d40b, 0x2b8acf1c, 0x2084c611, 0x11aef932, 0x1aa0f03f, 0x07b2eb28, 0x0cbce225, 0x65e6956e, 0x6ee89c63, 0x73fa8774, 0x78f48e79, 0x49deb15a, 0x42d0b857, 0x5fc2a340, 0x54ccaa4d, 0xf741ecda, 0xfc4fe5d7, 0xe15dfec0, 0xea53f7cd, 0xdb79c8ee, 0xd077c1e3, 0xcd65daf4, 0xc66bd3f9, 0xaf31a4b2, 0xa43fadbf, 0xb92db6a8, 0xb223bfa5, 0x83098086, 0x8807898b, 0x9515929c, 0x9e1b9b91, 0x47a17c0a, 0x4caf7507, 0x51bd6e10, 0x5ab3671d, 0x6b99583e, 0x60975133, 0x7d854a24, 0x768b4329, 0x1fd13462, 0x14df3d6f, 0x09cd2678, 0x02c32f75, 0x33e91056, 0x38e7195b, 0x25f5024c, 0x2efb0b41, 0x8c9ad761, 0x8794de6c, 0x9a86c57b, 0x9188cc76, 0xa0a2f355, 0xabacfa58, 0xb6bee14f, 0xbdb0e842, 0xd4ea9f09, 0xdfe49604, 0xc2f68d13, 0xc9f8841e, 0xf8d2bb3d, 0xf3dcb230, 0xeecea927, 0xe5c0a02a, 0x3c7a47b1, 0x37744ebc, 0x2a6655ab, 0x21685ca6, 0x10426385, 0x1b4c6a88, 0x065e719f, 0x0d507892, 0x640a0fd9, 0x6f0406d4, 0x72161dc3, 0x791814ce, 0x48322bed, 0x433c22e0, 0x5e2e39f7, 0x552030fa, 0x01ec9ab7, 0x0ae293ba, 0x17f088ad, 0x1cfe81a0, 0x2dd4be83, 0x26dab78e, 0x3bc8ac99, 0x30c6a594, 0x599cd2df, 0x5292dbd2, 0x4f80c0c5, 0x448ec9c8, 0x75a4f6eb, 0x7eaaffe6, 0x63b8e4f1, 0x68b6edfc, 0xb10c0a67, 0xba02036a, 0xa710187d, 0xac1e1170, 0x9d342e53, 0x963a275e, 0x8b283c49, 0x80263544, 0xe97c420f, 0xe2724b02, 0xff605015, 0xf46e5918, 0xc544663b, 0xce4a6f36, 0xd3587421, 0xd8567d2c, 0x7a37a10c, 0x7139a801, 0x6c2bb316, 0x6725ba1b, 0x560f8538, 0x5d018c35, 0x40139722, 0x4b1d9e2f, 0x2247e964, 0x2949e069, 0x345bfb7e, 0x3f55f273, 0x0e7fcd50, 0x0571c45d, 0x1863df4a, 0x136dd647, 0xcad731dc, 0xc1d938d1, 0xdccb23c6, 0xd7c52acb, 0xe6ef15e8, 0xede11ce5, 0xf0f307f2, 0xfbfd0eff, 0x92a779b4, 0x99a970b9, 0x84bb6bae, 0x8fb562a3, 0xbe9f5d80, 0xb591548d, 0xa8834f9a, 0xa38d4697];
-           var U3 = [0x00000000, 0x0d0b0e09, 0x1a161c12, 0x171d121b, 0x342c3824, 0x3927362d, 0x2e3a2436, 0x23312a3f, 0x68587048, 0x65537e41, 0x724e6c5a, 0x7f456253, 0x5c74486c, 0x517f4665, 0x4662547e, 0x4b695a77, 0xd0b0e090, 0xddbbee99, 0xcaa6fc82, 0xc7adf28b, 0xe49cd8b4, 0xe997d6bd, 0xfe8ac4a6, 0xf381caaf, 0xb8e890d8, 0xb5e39ed1, 0xa2fe8cca, 0xaff582c3, 0x8cc4a8fc, 0x81cfa6f5, 0x96d2b4ee, 0x9bd9bae7, 0xbb7bdb3b, 0xb670d532, 0xa16dc729, 0xac66c920, 0x8f57e31f, 0x825ced16, 0x9541ff0d, 0x984af104, 0xd323ab73, 0xde28a57a, 0xc935b761, 0xc43eb968, 0xe70f9357, 0xea049d5e, 0xfd198f45, 0xf012814c, 0x6bcb3bab, 0x66c035a2, 0x71dd27b9, 0x7cd629b0, 0x5fe7038f, 0x52ec0d86, 0x45f11f9d, 0x48fa1194, 0x03934be3, 0x0e9845ea, 0x198557f1, 0x148e59f8, 0x37bf73c7, 0x3ab47dce, 0x2da96fd5, 0x20a261dc, 0x6df6ad76, 0x60fda37f, 0x77e0b164, 0x7aebbf6d, 0x59da9552, 0x54d19b5b, 0x43cc8940, 0x4ec78749, 0x05aedd3e, 0x08a5d337, 0x1fb8c12c, 0x12b3cf25, 0x3182e51a, 0x3c89eb13, 0x2b94f908, 0x269ff701, 0xbd464de6, 0xb04d43ef, 0xa75051f4, 0xaa5b5ffd, 0x896a75c2, 0x84617bcb, 0x937c69d0, 0x9e7767d9, 0xd51e3dae, 0xd81533a7, 0xcf0821bc, 0xc2032fb5, 0xe132058a, 0xec390b83, 0xfb241998, 0xf62f1791, 0xd68d764d, 0xdb867844, 0xcc9b6a5f, 0xc1906456, 0xe2a14e69, 0xefaa4060, 0xf8b7527b, 0xf5bc5c72, 0xbed50605, 0xb3de080c, 0xa4c31a17, 0xa9c8141e, 0x8af93e21, 0x87f23028, 0x90ef2233, 0x9de42c3a, 0x063d96dd, 0x0b3698d4, 0x1c2b8acf, 0x112084c6, 0x3211aef9, 0x3f1aa0f0, 0x2807b2eb, 0x250cbce2, 0x6e65e695, 0x636ee89c, 0x7473fa87, 0x7978f48e, 0x5a49deb1, 0x5742d0b8, 0x405fc2a3, 0x4d54ccaa, 0xdaf741ec, 0xd7fc4fe5, 0xc0e15dfe, 0xcdea53f7, 0xeedb79c8, 0xe3d077c1, 0xf4cd65da, 0xf9c66bd3, 0xb2af31a4, 0xbfa43fad, 0xa8b92db6, 0xa5b223bf, 0x86830980, 0x8b880789, 0x9c951592, 0x919e1b9b, 0x0a47a17c, 0x074caf75, 0x1051bd6e, 0x1d5ab367, 0x3e6b9958, 0x33609751, 0x247d854a, 0x29768b43, 0x621fd134, 0x6f14df3d, 0x7809cd26, 0x7502c32f, 0x5633e910, 0x5b38e719, 0x4c25f502, 0x412efb0b, 0x618c9ad7, 0x6c8794de, 0x7b9a86c5, 0x769188cc, 0x55a0a2f3, 0x58abacfa, 0x4fb6bee1, 0x42bdb0e8, 0x09d4ea9f, 0x04dfe496, 0x13c2f68d, 0x1ec9f884, 0x3df8d2bb, 0x30f3dcb2, 0x27eecea9, 0x2ae5c0a0, 0xb13c7a47, 0xbc37744e, 0xab2a6655, 0xa621685c, 0x85104263, 0x881b4c6a, 0x9f065e71, 0x920d5078, 0xd9640a0f, 0xd46f0406, 0xc372161d, 0xce791814, 0xed48322b, 0xe0433c22, 0xf75e2e39, 0xfa552030, 0xb701ec9a, 0xba0ae293, 0xad17f088, 0xa01cfe81, 0x832dd4be, 0x8e26dab7, 0x993bc8ac, 0x9430c6a5, 0xdf599cd2, 0xd25292db, 0xc54f80c0, 0xc8448ec9, 0xeb75a4f6, 0xe67eaaff, 0xf163b8e4, 0xfc68b6ed, 0x67b10c0a, 0x6aba0203, 0x7da71018, 0x70ac1e11, 0x539d342e, 0x5e963a27, 0x498b283c, 0x44802635, 0x0fe97c42, 0x02e2724b, 0x15ff6050, 0x18f46e59, 0x3bc54466, 0x36ce4a6f, 0x21d35874, 0x2cd8567d, 0x0c7a37a1, 0x017139a8, 0x166c2bb3, 0x1b6725ba, 0x38560f85, 0x355d018c, 0x22401397, 0x2f4b1d9e, 0x642247e9, 0x692949e0, 0x7e345bfb, 0x733f55f2, 0x500e7fcd, 0x5d0571c4, 0x4a1863df, 0x47136dd6, 0xdccad731, 0xd1c1d938, 0xc6dccb23, 0xcbd7c52a, 0xe8e6ef15, 0xe5ede11c, 0xf2f0f307, 0xfffbfd0e, 0xb492a779, 0xb999a970, 0xae84bb6b, 0xa38fb562, 0x80be9f5d, 0x8db59154, 0x9aa8834f, 0x97a38d46];
-           var U4 = [0x00000000, 0x090d0b0e, 0x121a161c, 0x1b171d12, 0x24342c38, 0x2d392736, 0x362e3a24, 0x3f23312a, 0x48685870, 0x4165537e, 0x5a724e6c, 0x537f4562, 0x6c5c7448, 0x65517f46, 0x7e466254, 0x774b695a, 0x90d0b0e0, 0x99ddbbee, 0x82caa6fc, 0x8bc7adf2, 0xb4e49cd8, 0xbde997d6, 0xa6fe8ac4, 0xaff381ca, 0xd8b8e890, 0xd1b5e39e, 0xcaa2fe8c, 0xc3aff582, 0xfc8cc4a8, 0xf581cfa6, 0xee96d2b4, 0xe79bd9ba, 0x3bbb7bdb, 0x32b670d5, 0x29a16dc7, 0x20ac66c9, 0x1f8f57e3, 0x16825ced, 0x0d9541ff, 0x04984af1, 0x73d323ab, 0x7ade28a5, 0x61c935b7, 0x68c43eb9, 0x57e70f93, 0x5eea049d, 0x45fd198f, 0x4cf01281, 0xab6bcb3b, 0xa266c035, 0xb971dd27, 0xb07cd629, 0x8f5fe703, 0x8652ec0d, 0x9d45f11f, 0x9448fa11, 0xe303934b, 0xea0e9845, 0xf1198557, 0xf8148e59, 0xc737bf73, 0xce3ab47d, 0xd52da96f, 0xdc20a261, 0x766df6ad, 0x7f60fda3, 0x6477e0b1, 0x6d7aebbf, 0x5259da95, 0x5b54d19b, 0x4043cc89, 0x494ec787, 0x3e05aedd, 0x3708a5d3, 0x2c1fb8c1, 0x2512b3cf, 0x1a3182e5, 0x133c89eb, 0x082b94f9, 0x01269ff7, 0xe6bd464d, 0xefb04d43, 0xf4a75051, 0xfdaa5b5f, 0xc2896a75, 0xcb84617b, 0xd0937c69, 0xd99e7767, 0xaed51e3d, 0xa7d81533, 0xbccf0821, 0xb5c2032f, 0x8ae13205, 0x83ec390b, 0x98fb2419, 0x91f62f17, 0x4dd68d76, 0x44db8678, 0x5fcc9b6a, 0x56c19064, 0x69e2a14e, 0x60efaa40, 0x7bf8b752, 0x72f5bc5c, 0x05bed506, 0x0cb3de08, 0x17a4c31a, 0x1ea9c814, 0x218af93e, 0x2887f230, 0x3390ef22, 0x3a9de42c, 0xdd063d96, 0xd40b3698, 0xcf1c2b8a, 0xc6112084, 0xf93211ae, 0xf03f1aa0, 0xeb2807b2, 0xe2250cbc, 0x956e65e6, 0x9c636ee8, 0x877473fa, 0x8e7978f4, 0xb15a49de, 0xb85742d0, 0xa3405fc2, 0xaa4d54cc, 0xecdaf741, 0xe5d7fc4f, 0xfec0e15d, 0xf7cdea53, 0xc8eedb79, 0xc1e3d077, 0xdaf4cd65, 0xd3f9c66b, 0xa4b2af31, 0xadbfa43f, 0xb6a8b92d, 0xbfa5b223, 0x80868309, 0x898b8807, 0x929c9515, 0x9b919e1b, 0x7c0a47a1, 0x75074caf, 0x6e1051bd, 0x671d5ab3, 0x583e6b99, 0x51336097, 0x4a247d85, 0x4329768b, 0x34621fd1, 0x3d6f14df, 0x267809cd, 0x2f7502c3, 0x105633e9, 0x195b38e7, 0x024c25f5, 0x0b412efb, 0xd7618c9a, 0xde6c8794, 0xc57b9a86, 0xcc769188, 0xf355a0a2, 0xfa58abac, 0xe14fb6be, 0xe842bdb0, 0x9f09d4ea, 0x9604dfe4, 0x8d13c2f6, 0x841ec9f8, 0xbb3df8d2, 0xb230f3dc, 0xa927eece, 0xa02ae5c0, 0x47b13c7a, 0x4ebc3774, 0x55ab2a66, 0x5ca62168, 0x63851042, 0x6a881b4c, 0x719f065e, 0x78920d50, 0x0fd9640a, 0x06d46f04, 0x1dc37216, 0x14ce7918, 0x2bed4832, 0x22e0433c, 0x39f75e2e, 0x30fa5520, 0x9ab701ec, 0x93ba0ae2, 0x88ad17f0, 0x81a01cfe, 0xbe832dd4, 0xb78e26da, 0xac993bc8, 0xa59430c6, 0xd2df599c, 0xdbd25292, 0xc0c54f80, 0xc9c8448e, 0xf6eb75a4, 0xffe67eaa, 0xe4f163b8, 0xedfc68b6, 0x0a67b10c, 0x036aba02, 0x187da710, 0x1170ac1e, 0x2e539d34, 0x275e963a, 0x3c498b28, 0x35448026, 0x420fe97c, 0x4b02e272, 0x5015ff60, 0x5918f46e, 0x663bc544, 0x6f36ce4a, 0x7421d358, 0x7d2cd856, 0xa10c7a37, 0xa8017139, 0xb3166c2b, 0xba1b6725, 0x8538560f, 0x8c355d01, 0x97224013, 0x9e2f4b1d, 0xe9642247, 0xe0692949, 0xfb7e345b, 0xf2733f55, 0xcd500e7f, 0xc45d0571, 0xdf4a1863, 0xd647136d, 0x31dccad7, 0x38d1c1d9, 0x23c6dccb, 0x2acbd7c5, 0x15e8e6ef, 0x1ce5ede1, 0x07f2f0f3, 0x0efffbfd, 0x79b492a7, 0x70b999a9, 0x6bae84bb, 0x62a38fb5, 0x5d80be9f, 0x548db591, 0x4f9aa883, 0x4697a38d];
-
-           function convertToInt32(bytes) {
-               var result = [];
-               for (var i = 0; i < bytes.length; i += 4) {
-                   result.push(
-                       (bytes[i    ] << 24) |
-                       (bytes[i + 1] << 16) |
-                       (bytes[i + 2] <<  8) |
-                        bytes[i + 3]
-                   );
-               }
-               return result;
-           }
-
-           var AES = function(key) {
-               if (!(this instanceof AES)) {
-                   throw Error('AES must be instanitated with `new`');
-               }
-
-               Object.defineProperty(this, 'key', {
-                   value: coerceArray(key, true)
-               });
-
-               this._prepare();
-           };
-
-
-           AES.prototype._prepare = function() {
-
-               var rounds = numberOfRounds[this.key.length];
-               if (rounds == null) {
-                   throw new Error('invalid key size (must be 16, 24 or 32 bytes)');
-               }
-
-               // encryption round keys
-               this._Ke = [];
-
-               // decryption round keys
-               this._Kd = [];
-
-               for (var i = 0; i <= rounds; i++) {
-                   this._Ke.push([0, 0, 0, 0]);
-                   this._Kd.push([0, 0, 0, 0]);
-               }
-
-               var roundKeyCount = (rounds + 1) * 4;
-               var KC = this.key.length / 4;
-
-               // convert the key into ints
-               var tk = convertToInt32(this.key);
-
-               // copy values into round key arrays
-               var index;
-               for (var i = 0; i < KC; i++) {
-                   index = i >> 2;
-                   this._Ke[index][i % 4] = tk[i];
-                   this._Kd[rounds - index][i % 4] = tk[i];
-               }
-
-               // key expansion (fips-197 section 5.2)
-               var rconpointer = 0;
-               var t = KC, tt;
-               while (t < roundKeyCount) {
-                   tt = tk[KC - 1];
-                   tk[0] ^= ((S[(tt >> 16) & 0xFF] << 24) ^
-                             (S[(tt >>  8) & 0xFF] << 16) ^
-                             (S[ tt        & 0xFF] <<  8) ^
-                              S[(tt >> 24) & 0xFF]        ^
-                             (rcon[rconpointer] << 24));
-                   rconpointer += 1;
-
-                   // key expansion (for non-256 bit)
-                   if (KC != 8) {
-                       for (var i = 1; i < KC; i++) {
-                           tk[i] ^= tk[i - 1];
-                       }
-
-                   // key expansion for 256-bit keys is "slightly different" (fips-197)
-                   } else {
-                       for (var i = 1; i < (KC / 2); i++) {
-                           tk[i] ^= tk[i - 1];
-                       }
-                       tt = tk[(KC / 2) - 1];
-
-                       tk[KC / 2] ^= (S[ tt        & 0xFF]        ^
-                                     (S[(tt >>  8) & 0xFF] <<  8) ^
-                                     (S[(tt >> 16) & 0xFF] << 16) ^
-                                     (S[(tt >> 24) & 0xFF] << 24));
-
-                       for (var i = (KC / 2) + 1; i < KC; i++) {
-                           tk[i] ^= tk[i - 1];
-                       }
-                   }
-
-                   // copy values into round key arrays
-                   var i = 0, r, c;
-                   while (i < KC && t < roundKeyCount) {
-                       r = t >> 2;
-                       c = t % 4;
-                       this._Ke[r][c] = tk[i];
-                       this._Kd[rounds - r][c] = tk[i++];
-                       t++;
-                   }
-               }
-
-               // inverse-cipher-ify the decryption round key (fips-197 section 5.3)
-               for (var r = 1; r < rounds; r++) {
-                   for (var c = 0; c < 4; c++) {
-                       tt = this._Kd[r][c];
-                       this._Kd[r][c] = (U1[(tt >> 24) & 0xFF] ^
-                                         U2[(tt >> 16) & 0xFF] ^
-                                         U3[(tt >>  8) & 0xFF] ^
-                                         U4[ tt        & 0xFF]);
-                   }
-               }
-           };
-
-           AES.prototype.encrypt = function(plaintext) {
-               if (plaintext.length != 16) {
-                   throw new Error('invalid plaintext size (must be 16 bytes)');
-               }
-
-               var rounds = this._Ke.length - 1;
-               var a = [0, 0, 0, 0];
-
-               // convert plaintext to (ints ^ key)
-               var t = convertToInt32(plaintext);
-               for (var i = 0; i < 4; i++) {
-                   t[i] ^= this._Ke[0][i];
-               }
-
-               // apply round transforms
-               for (var r = 1; r < rounds; r++) {
-                   for (var i = 0; i < 4; i++) {
-                       a[i] = (T1[(t[ i         ] >> 24) & 0xff] ^
-                               T2[(t[(i + 1) % 4] >> 16) & 0xff] ^
-                               T3[(t[(i + 2) % 4] >>  8) & 0xff] ^
-                               T4[ t[(i + 3) % 4]        & 0xff] ^
-                               this._Ke[r][i]);
-                   }
-                   t = a.slice();
-               }
-
-               // the last round is special
-               var result = createArray(16), tt;
-               for (var i = 0; i < 4; i++) {
-                   tt = this._Ke[rounds][i];
-                   result[4 * i    ] = (S[(t[ i         ] >> 24) & 0xff] ^ (tt >> 24)) & 0xff;
-                   result[4 * i + 1] = (S[(t[(i + 1) % 4] >> 16) & 0xff] ^ (tt >> 16)) & 0xff;
-                   result[4 * i + 2] = (S[(t[(i + 2) % 4] >>  8) & 0xff] ^ (tt >>  8)) & 0xff;
-                   result[4 * i + 3] = (S[ t[(i + 3) % 4]        & 0xff] ^  tt       ) & 0xff;
-               }
-
-               return result;
-           };
-
-           AES.prototype.decrypt = function(ciphertext) {
-               if (ciphertext.length != 16) {
-                   throw new Error('invalid ciphertext size (must be 16 bytes)');
-               }
-
-               var rounds = this._Kd.length - 1;
-               var a = [0, 0, 0, 0];
-
-               // convert plaintext to (ints ^ key)
-               var t = convertToInt32(ciphertext);
-               for (var i = 0; i < 4; i++) {
-                   t[i] ^= this._Kd[0][i];
-               }
-
-               // apply round transforms
-               for (var r = 1; r < rounds; r++) {
-                   for (var i = 0; i < 4; i++) {
-                       a[i] = (T5[(t[ i          ] >> 24) & 0xff] ^
-                               T6[(t[(i + 3) % 4] >> 16) & 0xff] ^
-                               T7[(t[(i + 2) % 4] >>  8) & 0xff] ^
-                               T8[ t[(i + 1) % 4]        & 0xff] ^
-                               this._Kd[r][i]);
-                   }
-                   t = a.slice();
-               }
-
-               // the last round is special
-               var result = createArray(16), tt;
-               for (var i = 0; i < 4; i++) {
-                   tt = this._Kd[rounds][i];
-                   result[4 * i    ] = (Si[(t[ i         ] >> 24) & 0xff] ^ (tt >> 24)) & 0xff;
-                   result[4 * i + 1] = (Si[(t[(i + 3) % 4] >> 16) & 0xff] ^ (tt >> 16)) & 0xff;
-                   result[4 * i + 2] = (Si[(t[(i + 2) % 4] >>  8) & 0xff] ^ (tt >>  8)) & 0xff;
-                   result[4 * i + 3] = (Si[ t[(i + 1) % 4]        & 0xff] ^  tt       ) & 0xff;
-               }
-
-               return result;
-           };
-
-
-           /**
-            *  Mode Of Operation - Electonic Codebook (ECB)
-            */
-           var ModeOfOperationECB = function(key) {
-               if (!(this instanceof ModeOfOperationECB)) {
-                   throw Error('AES must be instanitated with `new`');
-               }
-
-               this.description = "Electronic Code Block";
-               this.name = "ecb";
-
-               this._aes = new AES(key);
-           };
-
-           ModeOfOperationECB.prototype.encrypt = function(plaintext) {
-               plaintext = coerceArray(plaintext);
-
-               if ((plaintext.length % 16) !== 0) {
-                   throw new Error('invalid plaintext size (must be multiple of 16 bytes)');
-               }
-
-               var ciphertext = createArray(plaintext.length);
-               var block = createArray(16);
-
-               for (var i = 0; i < plaintext.length; i += 16) {
-                   copyArray(plaintext, block, 0, i, i + 16);
-                   block = this._aes.encrypt(block);
-                   copyArray(block, ciphertext, i);
-               }
-
-               return ciphertext;
-           };
-
-           ModeOfOperationECB.prototype.decrypt = function(ciphertext) {
-               ciphertext = coerceArray(ciphertext);
-
-               if ((ciphertext.length % 16) !== 0) {
-                   throw new Error('invalid ciphertext size (must be multiple of 16 bytes)');
-               }
-
-               var plaintext = createArray(ciphertext.length);
-               var block = createArray(16);
-
-               for (var i = 0; i < ciphertext.length; i += 16) {
-                   copyArray(ciphertext, block, 0, i, i + 16);
-                   block = this._aes.decrypt(block);
-                   copyArray(block, plaintext, i);
-               }
-
-               return plaintext;
-           };
-
-
-           /**
-            *  Mode Of Operation - Cipher Block Chaining (CBC)
-            */
-           var ModeOfOperationCBC = function(key, iv) {
-               if (!(this instanceof ModeOfOperationCBC)) {
-                   throw Error('AES must be instanitated with `new`');
-               }
-
-               this.description = "Cipher Block Chaining";
-               this.name = "cbc";
-
-               if (!iv) {
-                   iv = createArray(16);
-
-               } else if (iv.length != 16) {
-                   throw new Error('invalid initialation vector size (must be 16 bytes)');
-               }
-
-               this._lastCipherblock = coerceArray(iv, true);
-
-               this._aes = new AES(key);
-           };
-
-           ModeOfOperationCBC.prototype.encrypt = function(plaintext) {
-               plaintext = coerceArray(plaintext);
-
-               if ((plaintext.length % 16) !== 0) {
-                   throw new Error('invalid plaintext size (must be multiple of 16 bytes)');
-               }
-
-               var ciphertext = createArray(plaintext.length);
-               var block = createArray(16);
-
-               for (var i = 0; i < plaintext.length; i += 16) {
-                   copyArray(plaintext, block, 0, i, i + 16);
-
-                   for (var j = 0; j < 16; j++) {
-                       block[j] ^= this._lastCipherblock[j];
-                   }
-
-                   this._lastCipherblock = this._aes.encrypt(block);
-                   copyArray(this._lastCipherblock, ciphertext, i);
-               }
-
-               return ciphertext;
-           };
-
-           ModeOfOperationCBC.prototype.decrypt = function(ciphertext) {
-               ciphertext = coerceArray(ciphertext);
-
-               if ((ciphertext.length % 16) !== 0) {
-                   throw new Error('invalid ciphertext size (must be multiple of 16 bytes)');
-               }
-
-               var plaintext = createArray(ciphertext.length);
-               var block = createArray(16);
-
-               for (var i = 0; i < ciphertext.length; i += 16) {
-                   copyArray(ciphertext, block, 0, i, i + 16);
-                   block = this._aes.decrypt(block);
-
-                   for (var j = 0; j < 16; j++) {
-                       plaintext[i + j] = block[j] ^ this._lastCipherblock[j];
-                   }
-
-                   copyArray(ciphertext, this._lastCipherblock, 0, i, i + 16);
-               }
-
-               return plaintext;
-           };
-
-
-           /**
-            *  Mode Of Operation - Cipher Feedback (CFB)
-            */
-           var ModeOfOperationCFB = function(key, iv, segmentSize) {
-               if (!(this instanceof ModeOfOperationCFB)) {
-                   throw Error('AES must be instanitated with `new`');
-               }
-
-               this.description = "Cipher Feedback";
-               this.name = "cfb";
-
-               if (!iv) {
-                   iv = createArray(16);
-
-               } else if (iv.length != 16) {
-                   throw new Error('invalid initialation vector size (must be 16 size)');
-               }
-
-               if (!segmentSize) { segmentSize = 1; }
-
-               this.segmentSize = segmentSize;
-
-               this._shiftRegister = coerceArray(iv, true);
-
-               this._aes = new AES(key);
-           };
-
-           ModeOfOperationCFB.prototype.encrypt = function(plaintext) {
-               if ((plaintext.length % this.segmentSize) != 0) {
-                   throw new Error('invalid plaintext size (must be segmentSize bytes)');
-               }
-
-               var encrypted = coerceArray(plaintext, true);
-
-               var xorSegment;
-               for (var i = 0; i < encrypted.length; i += this.segmentSize) {
-                   xorSegment = this._aes.encrypt(this._shiftRegister);
-                   for (var j = 0; j < this.segmentSize; j++) {
-                       encrypted[i + j] ^= xorSegment[j];
-                   }
-
-                   // Shift the register
-                   copyArray(this._shiftRegister, this._shiftRegister, 0, this.segmentSize);
-                   copyArray(encrypted, this._shiftRegister, 16 - this.segmentSize, i, i + this.segmentSize);
-               }
-
-               return encrypted;
-           };
-
-           ModeOfOperationCFB.prototype.decrypt = function(ciphertext) {
-               if ((ciphertext.length % this.segmentSize) != 0) {
-                   throw new Error('invalid ciphertext size (must be segmentSize bytes)');
-               }
-
-               var plaintext = coerceArray(ciphertext, true);
-
-               var xorSegment;
-               for (var i = 0; i < plaintext.length; i += this.segmentSize) {
-                   xorSegment = this._aes.encrypt(this._shiftRegister);
-
-                   for (var j = 0; j < this.segmentSize; j++) {
-                       plaintext[i + j] ^= xorSegment[j];
-                   }
-
-                   // Shift the register
-                   copyArray(this._shiftRegister, this._shiftRegister, 0, this.segmentSize);
-                   copyArray(ciphertext, this._shiftRegister, 16 - this.segmentSize, i, i + this.segmentSize);
-               }
-
-               return plaintext;
-           };
-
-           /**
-            *  Mode Of Operation - Output Feedback (OFB)
-            */
-           var ModeOfOperationOFB = function(key, iv) {
-               if (!(this instanceof ModeOfOperationOFB)) {
-                   throw Error('AES must be instanitated with `new`');
-               }
-
-               this.description = "Output Feedback";
-               this.name = "ofb";
-
-               if (!iv) {
-                   iv = createArray(16);
-
-               } else if (iv.length != 16) {
-                   throw new Error('invalid initialation vector size (must be 16 bytes)');
-               }
-
-               this._lastPrecipher = coerceArray(iv, true);
-               this._lastPrecipherIndex = 16;
-
-               this._aes = new AES(key);
-           };
-
-           ModeOfOperationOFB.prototype.encrypt = function(plaintext) {
-               var encrypted = coerceArray(plaintext, true);
-
-               for (var i = 0; i < encrypted.length; i++) {
-                   if (this._lastPrecipherIndex === 16) {
-                       this._lastPrecipher = this._aes.encrypt(this._lastPrecipher);
-                       this._lastPrecipherIndex = 0;
-                   }
-                   encrypted[i] ^= this._lastPrecipher[this._lastPrecipherIndex++];
-               }
-
-               return encrypted;
-           };
-
-           // Decryption is symetric
-           ModeOfOperationOFB.prototype.decrypt = ModeOfOperationOFB.prototype.encrypt;
-
-
-           /**
-            *  Counter object for CTR common mode of operation
-            */
-           var Counter = function(initialValue) {
-               if (!(this instanceof Counter)) {
-                   throw Error('Counter must be instanitated with `new`');
-               }
-
-               // We allow 0, but anything false-ish uses the default 1
-               if (initialValue !== 0 && !initialValue) { initialValue = 1; }
-
-               if (typeof(initialValue) === 'number') {
-                   this._counter = createArray(16);
-                   this.setValue(initialValue);
-
-               } else {
-                   this.setBytes(initialValue);
-               }
-           };
-
-           Counter.prototype.setValue = function(value) {
-               if (typeof(value) !== 'number' || parseInt(value) != value) {
-                   throw new Error('invalid counter value (must be an integer)');
-               }
-
-               // We cannot safely handle numbers beyond the safe range for integers
-               if (value > Number.MAX_SAFE_INTEGER) {
-                   throw new Error('integer value out of safe range');
-               }
-
-               for (var index = 15; index >= 0; --index) {
-                   this._counter[index] = value % 256;
-                   value = parseInt(value / 256);
-               }
-           };
-
-           Counter.prototype.setBytes = function(bytes) {
-               bytes = coerceArray(bytes, true);
-
-               if (bytes.length != 16) {
-                   throw new Error('invalid counter bytes size (must be 16 bytes)');
-               }
-
-               this._counter = bytes;
-           };
-
-           Counter.prototype.increment = function() {
-               for (var i = 15; i >= 0; i--) {
-                   if (this._counter[i] === 255) {
-                       this._counter[i] = 0;
-                   } else {
-                       this._counter[i]++;
-                       break;
-                   }
-               }
-           };
-
-
-           /**
-            *  Mode Of Operation - Counter (CTR)
-            */
-           var ModeOfOperationCTR = function(key, counter) {
-               if (!(this instanceof ModeOfOperationCTR)) {
-                   throw Error('AES must be instanitated with `new`');
-               }
-
-               this.description = "Counter";
-               this.name = "ctr";
-
-               if (!(counter instanceof Counter)) {
-                   counter = new Counter(counter);
-               }
-
-               this._counter = counter;
-
-               this._remainingCounter = null;
-               this._remainingCounterIndex = 16;
-
-               this._aes = new AES(key);
-           };
-
-           ModeOfOperationCTR.prototype.encrypt = function(plaintext) {
-               var encrypted = coerceArray(plaintext, true);
-
-               for (var i = 0; i < encrypted.length; i++) {
-                   if (this._remainingCounterIndex === 16) {
-                       this._remainingCounter = this._aes.encrypt(this._counter._counter);
-                       this._remainingCounterIndex = 0;
-                       this._counter.increment();
-                   }
-                   encrypted[i] ^= this._remainingCounter[this._remainingCounterIndex++];
-               }
-
-               return encrypted;
-           };
-
-           // Decryption is symetric
-           ModeOfOperationCTR.prototype.decrypt = ModeOfOperationCTR.prototype.encrypt;
-
-
-           ///////////////////////
-           // Padding
-
-           // See:https://tools.ietf.org/html/rfc2315
-           function pkcs7pad(data) {
-               data = coerceArray(data, true);
-               var padder = 16 - (data.length % 16);
-               var result = createArray(data.length + padder);
-               copyArray(data, result);
-               for (var i = data.length; i < result.length; i++) {
-                   result[i] = padder;
-               }
-               return result;
-           }
-
-           function pkcs7strip(data) {
-               data = coerceArray(data, true);
-               if (data.length < 16) { throw new Error('PKCS#7 invalid length'); }
-
-               var padder = data[data.length - 1];
-               if (padder > 16) { throw new Error('PKCS#7 padding byte out of range'); }
-
-               var length = data.length - padder;
-               for (var i = 0; i < padder; i++) {
-                   if (data[length + i] !== padder) {
-                       throw new Error('PKCS#7 invalid padding byte');
-                   }
-               }
-
-               var result = createArray(length);
-               copyArray(data, result, 0, 0, length);
-               return result;
-           }
-
-           ///////////////////////
-           // Exporting
-
-
-           // The block cipher
-           var aesjs = {
-               AES: AES,
-               Counter: Counter,
-
-               ModeOfOperation: {
-                   ecb: ModeOfOperationECB,
-                   cbc: ModeOfOperationCBC,
-                   cfb: ModeOfOperationCFB,
-                   ofb: ModeOfOperationOFB,
-                   ctr: ModeOfOperationCTR
-               },
-
-               utils: {
-                   hex: convertHex,
-                   utf8: convertUtf8
-               },
-
-               padding: {
-                   pkcs7: {
-                       pad: pkcs7pad,
-                       strip: pkcs7strip
-                   }
-               },
-
-               _arrayTest: {
-                   coerceArray: coerceArray,
-                   createArray: createArray,
-                   copyArray: copyArray,
-               }
-           };
-
-
-           // node.js
-           {
-               module.exports = aesjs;
-
-           // RequireJS/AMD
-           // http://www.requirejs.org/docs/api.html
-           // https://github.com/amdjs/amdjs-api/wiki/AMD
-           }
-
-
-       })();
-       });
-
-       // See https://github.com/ricmoo/aes-js
-       // We can use keys that are 128 bits (16 bytes), 192 bits (24 bytes) or 256 bits (32 bytes).
-       // To generate a random key:  window.crypto.getRandomValues(new Uint8Array(16));
-
-       // This default signing key is built into iD and can be used to mask/unmask sensitive values.
-       const DEFAULT_128 = [250, 157, 60, 79, 142, 134, 229, 129, 138, 126, 210, 129, 29, 71, 160, 208];
-
-
-       function utilAesEncrypt(text, key) {
-         key = key || DEFAULT_128;
-         const textBytes = aesJs.utils.utf8.toBytes(text);
-         const aesCtr = new aesJs.ModeOfOperation.ctr(key);
-         const encryptedBytes = aesCtr.encrypt(textBytes);
-         const encryptedHex = aesJs.utils.hex.fromBytes(encryptedBytes);
-         return encryptedHex;
-       }
-
-
-       function utilAesDecrypt(encryptedHex, key) {
-         key = key || DEFAULT_128;
-         const encryptedBytes = aesJs.utils.hex.toBytes(encryptedHex);
-         const aesCtr = new aesJs.ModeOfOperation.ctr(key);
-         const decryptedBytes = aesCtr.decrypt(encryptedBytes);
-         const text = aesJs.utils.utf8.fromBytes(decryptedBytes);
-         return text;
-       }
-
-       function utilCleanTags(tags) {
-           var out = {};
-           for (var k in tags) {
-               if (!k) continue;
-               var v = tags[k];
-               if (v !== undefined) {
-                   out[k] = cleanValue(k, v);
-               }
-           }
-
-           return out;
-
-
-           function cleanValue(k, v) {
-               function keepSpaces(k) {
-                   return /_hours|_times|:conditional$/.test(k);
-               }
-
-               function skip(k) {
-                   return /^(description|note|fixme)$/.test(k);
-               }
-
-               if (skip(k)) return v;
-
-               var cleaned = v
-                   .split(';')
-                   .map(function(s) { return s.trim(); })
-                   .join(keepSpaces(k) ? '; ' : ';');
-
-               // The code below is not intended to validate websites and emails.
-               // It is only intended to prevent obvious copy-paste errors. (#2323)
-               // clean website- and email-like tags
-               if (k.indexOf('website') !== -1 ||
-                   k.indexOf('email') !== -1 ||
-                   cleaned.indexOf('http') === 0) {
-                   cleaned = cleaned
-                       .replace(/[\u200B-\u200F\uFEFF]/g, '');  // strip LRM and other zero width chars
-
-               }
-
-               return cleaned;
-           }
-       }
-
-       // Like selection.property('value', ...), but avoids no-op value sets,
-       // which can result in layout/repaint thrashing in some situations.
-       function utilGetSetValue(selection, value) {
-           function d3_selection_value(value) {
-               function valueNull() {
-                   delete this.value;
-               }
-
-               function valueConstant() {
-                   if (this.value !== value) {
-                       this.value = value;
-                   }
-               }
-
-               function valueFunction() {
-                   var x = value.apply(this, arguments);
-                   if (x == null) {
-                       delete this.value;
-                   } else if (this.value !== x) {
-                       this.value = x;
-                   }
-               }
-
-               return value == null
-                   ? valueNull : (typeof value === 'function'
-                   ? valueFunction : valueConstant);
-           }
-
-           if (arguments.length === 1) {
-               return selection.property('value');
-           }
-
-           return selection.each(d3_selection_value(value));
-       }
-
-       function utilKeybinding(namespace) {
-           var _keybindings = {};
-
-
-           function testBindings(isCapturing) {
-               var didMatch = false;
-               var bindings = Object.keys(_keybindings).map(function(id) { return _keybindings[id]; });
-               var i, binding;
-
-               // Most key shortcuts will accept either lower or uppercase ('h' or 'H'),
-               // so we don't strictly match on the shift key, but we prioritize
-               // shifted keybindings first, and fallback to unshifted only if no match.
-               // (This lets us differentiate between '←'/'⇧←' or '⌘Z'/'⌘⇧Z')
-
-               // priority match shifted keybindings first
-               for (i = 0; i < bindings.length; i++) {
-                   binding = bindings[i];
-                   if (!binding.event.modifiers.shiftKey) continue;  // no shift
-                   if (!!binding.capture !== isCapturing) continue;
-                   if (matches(binding, true)) {
-                       binding.callback();
-                       didMatch = true;
-                   }
-               }
-
-               // then unshifted keybindings
-               if (didMatch) return;
-               for (i = 0; i < bindings.length; i++) {
-                   binding = bindings[i];
-                   if (binding.event.modifiers.shiftKey) continue;   // shift
-                   if (!!binding.capture !== isCapturing) continue;
-                   if (matches(binding, false)) {
-                       binding.callback();
-                   }
-               }
-
-
-               function matches(binding, testShift) {
-                   var event$1 = event;
-                   var isMatch = false;
-                   var tryKeyCode = true;
-
-                   // Prefer a match on `KeyboardEvent.key`
-                   if (event$1.key !== undefined) {
-                       tryKeyCode = (event$1.key.charCodeAt(0) > 255);  // outside ISO-Latin-1
-                       isMatch = true;
-
-                       if (binding.event.key === undefined) {
-                           isMatch = false;
-                       } else if (Array.isArray(binding.event.key)) {
-                           if (binding.event.key.map(function(s) { return s.toLowerCase(); }).indexOf(event$1.key.toLowerCase()) === -1)
-                               isMatch = false;
-                       } else {
-                           if (event$1.key.toLowerCase() !== binding.event.key.toLowerCase())
-                               isMatch = false;
-                       }
-                   }
-
-                   // Fallback match on `KeyboardEvent.keyCode`, can happen if:
-                   // - browser doesn't support `KeyboardEvent.key`
-                   // - `KeyboardEvent.key` is outside ISO-Latin-1 range (cyrillic?)
-                   if (!isMatch && tryKeyCode) {
-                       isMatch = (event$1.keyCode === binding.event.keyCode);
-                   }
-
-                   if (!isMatch) return false;
-
-                   // test modifier keys
-                   if (!(event$1.ctrlKey && event$1.altKey)) {  // if both are set, assume AltGr and skip it - #4096
-                       if (event$1.ctrlKey !== binding.event.modifiers.ctrlKey) return false;
-                       if (event$1.altKey !== binding.event.modifiers.altKey) return false;
-                   }
-                   if (event$1.metaKey !== binding.event.modifiers.metaKey) return false;
-                   if (testShift && event$1.shiftKey !== binding.event.modifiers.shiftKey) return false;
-
-                   return true;
-               }
-           }
-
-
-           function capture() {
-               testBindings(true);
-           }
-
-
-           function bubble() {
-               var tagName = select(event.target).node().tagName;
-               if (tagName === 'INPUT' || tagName === 'SELECT' || tagName === 'TEXTAREA') {
-                   return;
-               }
-               testBindings(false);
-           }
-
-
-           function keybinding(selection) {
-               selection = selection || select(document);
-               selection.on('keydown.capture.' + namespace, capture, true);
-               selection.on('keydown.bubble.' + namespace, bubble, false);
-               return keybinding;
-           }
-
-           // was: keybinding.off()
-           keybinding.unbind = function(selection) {
-               _keybindings = [];
-               selection = selection || select(document);
-               selection.on('keydown.capture.' + namespace, null);
-               selection.on('keydown.bubble.' + namespace, null);
-               return keybinding;
-           };
-
-
-           keybinding.clear = function() {
-               _keybindings = {};
-               return keybinding;
-           };
-
-
-           // Remove one or more keycode bindings.
-           keybinding.off = function(codes, capture) {
-               var arr = utilArrayUniq([].concat(codes));
-
-               for (var i = 0; i < arr.length; i++) {
-                   var id = arr[i] + (capture ? '-capture' : '-bubble');
-                   delete _keybindings[id];
-               }
-               return keybinding;
-           };
-
-
-           // Add one or more keycode bindings.
-           keybinding.on = function(codes, callback, capture) {
-               if (typeof callback !== 'function') {
-                   return keybinding.off(codes, capture);
-               }
-
-               var arr = utilArrayUniq([].concat(codes));
-
-               for (var i = 0; i < arr.length; i++) {
-                   var id = arr[i] + (capture ? '-capture' : '-bubble');
-                   var binding = {
-                       id: id,
-                       capture: capture,
-                       callback: callback,
-                       event: {
-                           key: undefined,  // preferred
-                           keyCode: 0,      // fallback
-                           modifiers: {
-                               shiftKey: false,
-                               ctrlKey: false,
-                               altKey: false,
-                               metaKey: false
-                           }
-                       }
-                   };
-
-                   if (_keybindings[id]) {
-                       console.warn('warning: duplicate keybinding for "' + id + '"'); // eslint-disable-line no-console
-                   }
-
-                   _keybindings[id] = binding;
-
-                   var matches = arr[i].toLowerCase().match(/(?:(?:[^+⇧⌃⌥⌘])+|[⇧⌃⌥⌘]|\+\+|^\+$)/g);
-                   for (var j = 0; j < matches.length; j++) {
-                       // Normalise matching errors
-                       if (matches[j] === '++') matches[j] = '+';
-
-                       if (matches[j] in utilKeybinding.modifierCodes) {
-                           var prop = utilKeybinding.modifierProperties[utilKeybinding.modifierCodes[matches[j]]];
-                           binding.event.modifiers[prop] = true;
-                       } else {
-                           binding.event.key = utilKeybinding.keys[matches[j]] || matches[j];
-                           if (matches[j] in utilKeybinding.keyCodes) {
-                               binding.event.keyCode = utilKeybinding.keyCodes[matches[j]];
-                           }
-                       }
-                   }
-               }
-
-               return keybinding;
-           };
-
-
-           return keybinding;
-       }
-
-
-       /*
-        * See https://github.com/keithamus/jwerty
-        */
-
-       utilKeybinding.modifierCodes = {
-           // Shift key, ⇧
-           '⇧': 16, shift: 16,
-           // CTRL key, on Mac: ⌃
-           '⌃': 17, ctrl: 17,
-           // ALT key, on Mac: ⌥ (Alt)
-           '⌥': 18, alt: 18, option: 18,
-           // META, on Mac: ⌘ (CMD), on Windows (Win), on Linux (Super)
-           '⌘': 91, meta: 91, cmd: 91, 'super': 91, win: 91
-       };
-
-       utilKeybinding.modifierProperties = {
-           16: 'shiftKey',
-           17: 'ctrlKey',
-           18: 'altKey',
-           91: 'metaKey'
-       };
-
-       utilKeybinding.keys = {
-           // Backspace key, on Mac: ⌫ (Backspace)
-           '⌫': 'Backspace', backspace: 'Backspace',
-           // Tab Key, on Mac: ⇥ (Tab), on Windows ⇥⇥
-           '⇥': 'Tab', '⇆': 'Tab', tab: 'Tab',
-           // Return key, ↩
-           '↩': 'Enter', 'return': 'Enter', enter: 'Enter', '⌅': 'Enter',
-           // Pause/Break key
-           'pause': 'Pause', 'pause-break': 'Pause',
-           // Caps Lock key, ⇪
-           '⇪': 'CapsLock', caps: 'CapsLock', 'caps-lock': 'CapsLock',
-           // Escape key, on Mac: ⎋, on Windows: Esc
-           '⎋': ['Escape', 'Esc'], escape: ['Escape', 'Esc'], esc: ['Escape', 'Esc'],
-           // Space key
-           space: [' ', 'Spacebar'],
-           // Page-Up key, or pgup, on Mac: ↖
-           '↖': 'PageUp', pgup: 'PageUp', 'page-up': 'PageUp',
-           // Page-Down key, or pgdown, on Mac: ↘
-           '↘': 'PageDown', pgdown: 'PageDown', 'page-down': 'PageDown',
-           // END key, on Mac: ⇟
-           '⇟': 'End', end: 'End',
-           // HOME key, on Mac: ⇞
-           '⇞': 'Home', home: 'Home',
-           // Insert key, or ins
-           ins: 'Insert', insert: 'Insert',
-           // Delete key, on Mac: ⌦ (Delete)
-           '⌦': ['Delete', 'Del'], del: ['Delete', 'Del'], 'delete': ['Delete', 'Del'],
-           // Left Arrow Key, or ←
-           '←': ['ArrowLeft', 'Left'], left: ['ArrowLeft', 'Left'], 'arrow-left': ['ArrowLeft', 'Left'],
-           // Up Arrow Key, or ↑
-           '↑': ['ArrowUp', 'Up'], up: ['ArrowUp', 'Up'], 'arrow-up': ['ArrowUp', 'Up'],
-           // Right Arrow Key, or →
-           '→': ['ArrowRight', 'Right'], right: ['ArrowRight', 'Right'], 'arrow-right': ['ArrowRight', 'Right'],
-           // Up Arrow Key, or ↓
-           '↓': ['ArrowDown', 'Down'], down: ['ArrowDown', 'Down'], 'arrow-down': ['ArrowDown', 'Down'],
-           // odities, stuff for backward compatibility (browsers and code):
-           // Num-Multiply, or *
-           '*': ['*', 'Multiply'], star: ['*', 'Multiply'], asterisk: ['*', 'Multiply'], multiply: ['*', 'Multiply'],
-           // Num-Plus or +
-           '+': ['+', 'Add'], 'plus': ['+', 'Add'],
-           // Num-Subtract, or -
-           '-': ['-', 'Subtract'], subtract: ['-', 'Subtract'], 'dash': ['-', 'Subtract'],
-           // Semicolon
-           semicolon: ';',
-           // = or equals
-           equals: '=',
-           // Comma, or ,
-           comma: ',',
-           // Period, or ., or full-stop
-           period: '.', 'full-stop': '.',
-           // Slash, or /, or forward-slash
-           slash: '/', 'forward-slash': '/',
-           // Tick, or `, or back-quote
-           tick: '`', 'back-quote': '`',
-           // Open bracket, or [
-           'open-bracket': '[',
-           // Back slash, or \
-           'back-slash': '\\',
-           // Close backet, or ]
-           'close-bracket': ']',
-           // Apostrophe, or Quote, or '
-           quote: '\'', apostrophe: '\'',
-           // NUMPAD 0-9
-           'num-0': '0',
-           'num-1': '1',
-           'num-2': '2',
-           'num-3': '3',
-           'num-4': '4',
-           'num-5': '5',
-           'num-6': '6',
-           'num-7': '7',
-           'num-8': '8',
-           'num-9': '9',
-           // F1-F25
-           f1: 'F1',
-           f2: 'F2',
-           f3: 'F3',
-           f4: 'F4',
-           f5: 'F5',
-           f6: 'F6',
-           f7: 'F7',
-           f8: 'F8',
-           f9: 'F9',
-           f10: 'F10',
-           f11: 'F11',
-           f12: 'F12',
-           f13: 'F13',
-           f14: 'F14',
-           f15: 'F15',
-           f16: 'F16',
-           f17: 'F17',
-           f18: 'F18',
-           f19: 'F19',
-           f20: 'F20',
-           f21: 'F21',
-           f22: 'F22',
-           f23: 'F23',
-           f24: 'F24',
-           f25: 'F25'
-       };
-
-       utilKeybinding.keyCodes = {
-           // Backspace key, on Mac: ⌫ (Backspace)
-           '⌫': 8, backspace: 8,
-           // Tab Key, on Mac: ⇥ (Tab), on Windows ⇥⇥
-           '⇥': 9, '⇆': 9, tab: 9,
-           // Return key, ↩
-           '↩': 13, 'return': 13, enter: 13, '⌅': 13,
-           // Pause/Break key
-           'pause': 19, 'pause-break': 19,
-           // Caps Lock key, ⇪
-           '⇪': 20, caps: 20, 'caps-lock': 20,
-           // Escape key, on Mac: ⎋, on Windows: Esc
-           '⎋': 27, escape: 27, esc: 27,
-           // Space key
-           space: 32,
-           // Page-Up key, or pgup, on Mac: ↖
-           '↖': 33, pgup: 33, 'page-up': 33,
-           // Page-Down key, or pgdown, on Mac: ↘
-           '↘': 34, pgdown: 34, 'page-down': 34,
-           // END key, on Mac: ⇟
-           '⇟': 35, end: 35,
-           // HOME key, on Mac: ⇞
-           '⇞': 36, home: 36,
-           // Insert key, or ins
-           ins: 45, insert: 45,
-           // Delete key, on Mac: ⌦ (Delete)
-           '⌦': 46, del: 46, 'delete': 46,
-           // Left Arrow Key, or ←
-           '←': 37, left: 37, 'arrow-left': 37,
-           // Up Arrow Key, or ↑
-           '↑': 38, up: 38, 'arrow-up': 38,
-           // Right Arrow Key, or →
-           '→': 39, right: 39, 'arrow-right': 39,
-           // Up Arrow Key, or ↓
-           '↓': 40, down: 40, 'arrow-down': 40,
-           // odities, printing characters that come out wrong:
-           // Firefox Equals
-           'ffequals': 61,
-           // Num-Multiply, or *
-           '*': 106, star: 106, asterisk: 106, multiply: 106,
-           // Num-Plus or +
-           '+': 107, 'plus': 107,
-           // Num-Subtract, or -
-           '-': 109, subtract: 109,
-           // Firefox Plus
-           'ffplus': 171,
-           // Firefox Minus
-           'ffminus': 173,
-           // Semicolon
-           ';': 186, semicolon: 186,
-           // = or equals
-           '=': 187, 'equals': 187,
-           // Comma, or ,
-           ',': 188, comma: 188,
-           // Dash / Underscore key
-           'dash': 189,
-           // Period, or ., or full-stop
-           '.': 190, period: 190, 'full-stop': 190,
-           // Slash, or /, or forward-slash
-           '/': 191, slash: 191, 'forward-slash': 191,
-           // Tick, or `, or back-quote
-           '`': 192, tick: 192, 'back-quote': 192,
-           // Open bracket, or [
-           '[': 219, 'open-bracket': 219,
-           // Back slash, or \
-           '\\': 220, 'back-slash': 220,
-           // Close backet, or ]
-           ']': 221, 'close-bracket': 221,
-           // Apostrophe, or Quote, or '
-           '\'': 222, quote: 222, apostrophe: 222
-       };
-
-       // NUMPAD 0-9
-       var i$2 = 95, n = 0;
-       while (++i$2 < 106) {
-           utilKeybinding.keyCodes['num-' + n] = i$2;
-           ++n;
-       }
-
-       // 0-9
-       i$2 = 47; n = 0;
-       while (++i$2 < 58) {
-           utilKeybinding.keyCodes[n] = i$2;
-           ++n;
-       }
-
-       // F1-F25
-       i$2 = 111; n = 1;
-       while (++i$2 < 136) {
-           utilKeybinding.keyCodes['f' + n] = i$2;
-           ++n;
-       }
-
-       // a-z
-       i$2 = 64;
-       while (++i$2 < 91) {
-           utilKeybinding.keyCodes[String.fromCharCode(i$2).toLowerCase()] = i$2;
-       }
-
-       function utilObjectOmit(obj, omitKeys) {
-           return Object.keys(obj).reduce(function(result, key) {
-               if (omitKeys.indexOf(key) === -1) {
-                   result[key] = obj[key];  // keep
-               }
-               return result;
-           }, {});
-       }
-
-       // Copies a variable number of methods from source to target.
-       function utilRebind(target, source) {
-           var i = 1, n = arguments.length, method;
-           while (++i < n) {
-               target[method = arguments[i]] = d3_rebind(target, source, source[method]);
-           }
-           return target;
-       }
-
-       // Method is assumed to be a standard D3 getter-setter:
-       // If passed with no arguments, gets the value.
-       // If passed with arguments, sets the value and returns the target.
-       function d3_rebind(target, source, method) {
-           return function() {
-               var value = method.apply(source, arguments);
-               return value === source ? target : value;
-           };
-       }
-
-       // A per-domain session mutex backed by a cookie and dead man's
-       // switch. If the session crashes, the mutex will auto-release
-       // after 5 seconds.
-
-       // This accepts a string and returns an object that complies with utilSessionMutexType
-       function utilSessionMutex(name) {
-           var mutex = {};
-           var intervalID;
-
-           function renew() {
-               var expires = new Date();
-               expires.setSeconds(expires.getSeconds() + 5);
-               document.cookie = name + '=1; expires=' + expires.toUTCString() + '; sameSite=strict';
-           }
-
-           mutex.lock = function () {
-               if (intervalID) return true;
-               var cookie = document.cookie.replace(new RegExp('(?:(?:^|.*;)\\s*' + name + '\\s*\\=\\s*([^;]*).*$)|^.*$'), '$1');
-               if (cookie) return false;
-               renew();
-               intervalID = window.setInterval(renew, 4000);
-               return true;
-           };
-
-           mutex.unlock = function () {
-               if (!intervalID) return;
-               document.cookie = name + '=; expires=Thu, 01 Jan 1970 00:00:00 GMT; sameSite=strict';
-               clearInterval(intervalID);
-               intervalID = null;
-           };
-
-           mutex.locked = function () {
-               return !!intervalID;
-           };
-
-           return mutex;
-       }
-
-       function utilTiler() {
-           var _size = [256, 256];
-           var _scale = 256;
-           var _tileSize = 256;
-           var _zoomExtent = [0, 20];
-           var _translate = [_size[0] / 2, _size[1] / 2];
-           var _margin = 0;
-           var _skipNullIsland = false;
-
-
-           function clamp(num, min, max) {
-               return Math.max(min, Math.min(num, max));
-           }
-
-
-           function nearNullIsland(tile) {
-               var x = tile[0];
-               var y = tile[1];
-               var z = tile[2];
-               if (z >= 7) {
-                   var center = Math.pow(2, z - 1);
-                   var width = Math.pow(2, z - 6);
-                   var min = center - (width / 2);
-                   var max = center + (width / 2) - 1;
-                   return x >= min && x <= max && y >= min && y <= max;
-               }
-               return false;
-           }
-
-
-           function tiler() {
-               var z = geoScaleToZoom(_scale / (2 * Math.PI), _tileSize);
-               var z0 = clamp(Math.round(z), _zoomExtent[0], _zoomExtent[1]);
-               var tileMin = 0;
-               var tileMax = Math.pow(2, z0) - 1;
-               var log2ts = Math.log(_tileSize) * Math.LOG2E;
-               var k = Math.pow(2, z - z0 + log2ts);
-               var origin = [
-                   (_translate[0] - _scale / 2) / k,
-                   (_translate[1] - _scale / 2) / k
-               ];
-
-               var cols = range$1(
-                   clamp(Math.floor(-origin[0]) - _margin,               tileMin, tileMax + 1),
-                   clamp(Math.ceil(_size[0] / k - origin[0]) + _margin,  tileMin, tileMax + 1)
-               );
-               var rows = range$1(
-                   clamp(Math.floor(-origin[1]) - _margin,               tileMin, tileMax + 1),
-                   clamp(Math.ceil(_size[1] / k - origin[1]) + _margin,  tileMin, tileMax + 1)
-               );
-
-               var tiles = [];
-               for (var i = 0; i < rows.length; i++) {
-                   var y = rows[i];
-                   for (var j = 0; j < cols.length; j++) {
-                       var x = cols[j];
-
-                       if (i >= _margin && i <= rows.length - _margin &&
-                           j >= _margin && j <= cols.length - _margin) {
-                           tiles.unshift([x, y, z0]);  // tiles in view at beginning
-                       } else {
-                           tiles.push([x, y, z0]);     // tiles in margin at the end
-                       }
-                   }
-               }
-
-               tiles.translate = origin;
-               tiles.scale = k;
-
-               return tiles;
-           }
-
-
-           /**
-            * getTiles() returns an array of tiles that cover the map view
-            */
-           tiler.getTiles = function(projection) {
-               var origin = [
-                   projection.scale() * Math.PI - projection.translate()[0],
-                   projection.scale() * Math.PI - projection.translate()[1]
-               ];
-
-               this
-                   .size(projection.clipExtent()[1])
-                   .scale(projection.scale() * 2 * Math.PI)
-                   .translate(projection.translate());
-
-               var tiles = tiler();
-               var ts = tiles.scale;
-
-               return tiles
-                   .map(function(tile) {
-                       if (_skipNullIsland && nearNullIsland(tile)) {
-                           return false;
-                       }
-                       var x = tile[0] * ts - origin[0];
-                       var y = tile[1] * ts - origin[1];
-                       return {
-                           id: tile.toString(),
-                           xyz: tile,
-                           extent: geoExtent(
-                               projection.invert([x, y + ts]),
-                               projection.invert([x + ts, y])
-                           )
-                       };
-                   }).filter(Boolean);
-           };
-
-
-           /**
-            * getGeoJSON() returns a FeatureCollection for debugging tiles
-            */
-           tiler.getGeoJSON = function(projection) {
-               var features = tiler.getTiles(projection).map(function(tile) {
-                   return {
-                       type: 'Feature',
-                       properties: {
-                           id: tile.id,
-                           name: tile.id
-                       },
-                       geometry: {
-                           type: 'Polygon',
-                           coordinates: [ tile.extent.polygon() ]
-                       }
-                   };
-               });
-
-               return {
-                   type: 'FeatureCollection',
-                   features: features
-               };
-           };
-
-
-           tiler.tileSize = function(val) {
-               if (!arguments.length) return _tileSize;
-               _tileSize = val;
-               return tiler;
-           };
-
-
-           tiler.zoomExtent = function(val) {
-               if (!arguments.length) return _zoomExtent;
-               _zoomExtent = val;
-               return tiler;
-           };
-
-
-           tiler.size = function(val) {
-               if (!arguments.length) return _size;
-               _size = val;
-               return tiler;
-           };
-
-
-           tiler.scale = function(val) {
-               if (!arguments.length) return _scale;
-               _scale = val;
-               return tiler;
-           };
-
-
-           tiler.translate = function(val) {
-               if (!arguments.length) return _translate;
-               _translate = val;
-               return tiler;
-           };
-
-
-           // number to extend the rows/columns beyond those covering the viewport
-           tiler.margin = function(val) {
-               if (!arguments.length) return _margin;
-               _margin = +val;
-               return tiler;
-           };
-
-
-           tiler.skipNullIsland = function(val) {
-               if (!arguments.length) return _skipNullIsland;
-               _skipNullIsland = val;
-               return tiler;
-           };
-
-
-           return tiler;
-       }
-
-       function utilTriggerEvent(target, type) {
-           target.each(function() {
-               var evt = document.createEvent('HTMLEvents');
-               evt.initEvent(type, true, true);
-               this.dispatchEvent(evt);
-           });
-       }
-
-       let _mainLocalizer = coreLocalizer(); // singleton
-       let _t = _mainLocalizer.t;
-
-       //
-       // coreLocalizer manages language and locale parameters including translated strings
-       //
-       function coreLocalizer() {
-
-           let localizer = {};
-
-           let _dataLanguages = {};
-
-           // `localeData` is an object containing all _supported_ locale codes -> language info.
-           // {
-           // en: { rtl: false, languageNames: {…}, scriptNames: {…} },
-           // de: { rtl: false, languageNames: {…}, scriptNames: {…} },
-           // …
-           // }
-           let _dataLocales = {};
-
-           // `localeStrings` is an object containing all _loaded_ locale codes -> string data.
-           // {
-           // en: { icons: {…}, toolbar: {…}, modes: {…}, operations: {…}, … },
-           // de: { icons: {…}, toolbar: {…}, modes: {…}, operations: {…}, … },
-           // …
-           // }
-           let _localeStrings = {};
-
-           // the current locale parameters
-           let _localeCode = 'en-US';
-           let _languageCode = 'en';
-           let _textDirection = 'ltr';
-           let _usesMetric = false;
-           let _languageNames = {};
-           let _scriptNames = {};
-
-           // getters for the current locale parameters
-           localizer.localeCode = () => _localeCode;
-           localizer.languageCode = () => _languageCode;
-           localizer.textDirection = () => _textDirection;
-           localizer.usesMetric = () => _usesMetric;
-           localizer.languageNames = () => _languageNames;
-           localizer.scriptNames = () => _scriptNames;
-
-
-           // The client app may want to manually set the locale, regardless of the
-           // settings provided by the browser
-           let _preferredLocaleCodes = [];
-           localizer.preferredLocaleCodes = function(codes) {
-               if (!arguments.length) return _preferredLocaleCodes;
-               if (typeof codes === 'string') {
-                   // be generous and accept delimited strings as input
-                   _preferredLocaleCodes = codes.split(/,|;| /gi).filter(Boolean);
-               } else {
-                   _preferredLocaleCodes = codes;
-               }
-               return localizer;
-           };
-
-
-           var _loadPromise;
-
-           localizer.ensureLoaded = () => {
-
-               if (_loadPromise) return _loadPromise;
-
-               return _loadPromise = Promise.all([
-                       // load the list of langauges
-                       _mainFileFetcher.get('languages'),
-                       // load the list of supported locales
-                       _mainFileFetcher.get('locales')
-                   ])
-                   .then(results => {
-                       _dataLanguages = results[0];
-                       _dataLocales = results[1];
-                   })
-                   .then(() => {
-                       let requestedLocales = (_preferredLocaleCodes || [])
-                           // list of locales preferred by the browser in priority order
-                           .concat(utilDetect().browserLocales);
-                       _localeCode = bestSupportedLocale(requestedLocales);
-
-                       return Promise.all([
-                           // always load the English locale strings as fallbacks
-                           localizer.loadLocale('en'),
-                           // load the preferred locale
-                           localizer.loadLocale(_localeCode)
-                       ]);
-                   })
-                   .then(() => {
-                       updateForCurrentLocale();
-                   })
-                   .catch(err => console.error(err));  // eslint-disable-line
-           };
-
-           // Returns the best locale from `locales` supported by iD, if any
-           function bestSupportedLocale(locales) {
-               let supportedLocales = _dataLocales;
-
-               for (let i in locales) {
-                   let locale = locales[i];
-                   if (locale.includes('-')) { // full locale ('es-ES')
-
-                       if (supportedLocales[locale]) return locale;
-
-                       // If full locale not supported ('es-FAKE'), fallback to the base ('es')
-                       let langPart = locale.split('-')[0];
-                       if (supportedLocales[langPart]) return langPart;
-
-                   } else { // base locale ('es')
-
-                       // prefer a lower-priority full locale with this base ('es' < 'es-ES')
-                       let fullLocale = locales.find((locale2, index) => {
-                           return index > i &&
-                               locale2 !== locale &&
-                               locale2.split('-')[0] === locale &&
-                               supportedLocales[locale2];
-                       });
-                       if (fullLocale) return fullLocale;
-
-                       if (supportedLocales[locale]) return locale;
-                   }
-               }
-
-               return null;
-           }
-
-           function updateForCurrentLocale() {
-               if (!_localeCode) return;
-
-               _languageCode = _localeCode.split('-')[0];
-
-               const currentData = _dataLocales[_localeCode] || _dataLocales[_languageCode];
-
-               const hash = utilStringQs(window.location.hash);
-
-               if (hash.rtl === 'true') {
-                   _textDirection = 'rtl';
-               } else if (hash.rtl === 'false') {
-                   _textDirection = 'ltr';
-               }  else {
-                   _textDirection = currentData && currentData.rtl ? 'rtl' : 'ltr';
-               }
-
-               _languageNames = currentData && currentData.languageNames;
-               _scriptNames = currentData && currentData.scriptNames;
-
-               _usesMetric = _localeCode.slice(-3).toLowerCase() !== '-us';
-           }
-
-
-           /* Locales */
-           // Returns a Promise to load the strings for the requested locale
-           localizer.loadLocale = (requested) => {
-
-               if (!_dataLocales) {
-                   return Promise.reject('loadLocale called before init');
-               }
-
-               let locale = requested;
-
-               // US English is the default
-               if (locale.toLowerCase() === 'en-us') locale = 'en';
-
-               if (!_dataLocales[locale]) {
-                   return Promise.reject(`Unsupported locale: ${requested}`);
-               }
-
-               if (_localeStrings[locale]) {    // already loaded
-                   return Promise.resolve(locale);
-               }
-
-               let fileMap = _mainFileFetcher.fileMap();
-               const key = `locale_${locale}`;
-               fileMap[key] = `locales/${locale}.json`;
-
-               return _mainFileFetcher.get(key)
-                   .then(d => {
-                       _localeStrings[locale] = d[locale];
-                       return locale;
-                   });
-           };
-
-           /**
-           * Given a string identifier, try to find that string in the current
-           * language, and return it.  This function will be called recursively
-           * with locale `en` if a string can not be found in the requested language.
-           *
-           * @param  {string}   s             string identifier
-           * @param  {object?}  replacements  token replacements and default string
-           * @param  {string?}  locale        locale to use (defaults to currentLocale)
-           * @return {string?}  localized string
-           */
-           localizer.t = function(s, replacements, locale) {
-               locale = locale || _localeCode;
-
-               // US English is the default
-               if (locale.toLowerCase() === 'en-us') locale = 'en';
-
-               let path = s
-                 .split('.')
-                 .map(s => s.replace(/<TX_DOT>/g, '.'))
-                 .reverse();
-
-               let result = _localeStrings[locale];
-
-               while (result !== undefined && path.length) {
-                 result = result[path.pop()];
-               }
-
-               if (result !== undefined) {
-                 if (replacements) {
-                   for (let k in replacements) {
-                     const token = `{${k}}`;
-                     const regex = new RegExp(token, 'g');
-                     result = result.replace(regex, replacements[k]);
-                   }
-                 }
-                 return result;
-               }
-
-               if (locale !== 'en') {
-                 return localizer.t(s, replacements, 'en');  // fallback - recurse with 'en'
-               }
-
-               if (replacements && 'default' in replacements) {
-                 return replacements.default;      // fallback - replacements.default
-               }
-
-               const missing = `Missing ${locale} translation: ${s}`;
-               if (typeof console !== 'undefined') console.error(missing);  // eslint-disable-line
-
-               return missing;
-           };
-
-           localizer.languageName = (code, options) => {
-
-               if (_languageNames[code]) {  // name in locale langauge
-                 // e.g. "German"
-                 return _languageNames[code];
-               }
-
-               // sometimes we only want the local name
-               if (options && options.localOnly) return null;
-
-               const langInfo = _dataLanguages[code];
-               if (langInfo) {
-                 if (langInfo.nativeName) {  // name in native language
-                   // e.g. "Deutsch (de)"
-                   return localizer.t('translate.language_and_code', { language: langInfo.nativeName, code: code });
-
-                 } else if (langInfo.base && langInfo.script) {
-                   const base = langInfo.base;   // the code of the langauge this is based on
-
-                   if (_languageNames[base]) {   // base language name in locale langauge
-                     const scriptCode = langInfo.script;
-                     const script = _scriptNames[scriptCode] || scriptCode;
-                     // e.g. "Serbian (Cyrillic)"
-                     return localizer.t('translate.language_and_code', { language: _languageNames[base], code: script });
-
-                   } else if (_dataLanguages[base] && _dataLanguages[base].nativeName) {
-                     // e.g. "српски (sr-Cyrl)"
-                     return localizer.t('translate.language_and_code', { language: _dataLanguages[base].nativeName, code: code });
-                   }
-                 }
-               }
-               return code;  // if not found, use the code
-           };
-
-           return localizer;
-       }
-
-       //
-       // `presetCollection` is a wrapper around an `Array` of presets `collection`,
-       // and decorated with some extra methods for searching and matching geometry
-       //
-       function presetCollection(collection) {
-         const MAXRESULTS = 50;
-         let _this = {};
-         let _memo = {};
-
-         _this.collection = collection;
-
-         _this.item = (id) => {
-           if (_memo[id]) return _memo[id];
-           const found = _this.collection.find(d => d.id === id);
-           if (found) _memo[id] = found;
-           return found;
-         };
-
-         _this.index = (id) => _this.collection.findIndex(d => d.id === id);
-
-         _this.matchGeometry = (geometry) => {
-           return presetCollection(
-             _this.collection.filter(d => d.matchGeometry(geometry))
-           );
-         };
-
-         _this.matchAllGeometry = (geometries) => {
-           return presetCollection(
-             _this.collection.filter(d => d && d.matchAllGeometry(geometries))
-           );
-         };
-
-         _this.matchAnyGeometry = (geometries) => {
-           return presetCollection(
-             _this.collection.filter(d => geometries.some(geom => d.matchGeometry(geom)))
-           );
-         };
-
-         _this.fallback = (geometry) => {
-           let id = geometry;
-           if (id === 'vertex') id = 'point';
-           return _this.item(id);
-         };
-
-         _this.search = (value, geometry, countryCode) => {
-           if (!value) return _this;
-
-           value = value.toLowerCase().trim();
-
-           // match at name beginning or just after a space (e.g. "office" -> match "Law Office")
-           function leading(a) {
-             const index = a.indexOf(value);
-             return index === 0 || a[index - 1] === ' ';
-           }
-
-           // match at name beginning only
-           function leadingStrict(a) {
-             const index = a.indexOf(value);
-             return index === 0;
-           }
-
-           function sortNames(a, b) {
-             let aCompare = (a.suggestion ? a.originalName : a.name()).toLowerCase();
-             let bCompare = (b.suggestion ? b.originalName : b.name()).toLowerCase();
-
-             // priority if search string matches preset name exactly - #4325
-             if (value === aCompare) return -1;
-             if (value === bCompare) return 1;
-
-             // priority for higher matchScore
-             let i = b.originalScore - a.originalScore;
-             if (i !== 0) return i;
-
-             // priority if search string appears earlier in preset name
-             i = aCompare.indexOf(value) - bCompare.indexOf(value);
-             if (i !== 0) return i;
-
-             // priority for shorter preset names
-             return aCompare.length - bCompare.length;
-           }
-
-           let pool = _this.collection;
-           if (countryCode) {
-             pool = pool.filter(a => {
-               if (a.countryCodes && a.countryCodes.indexOf(countryCode) === -1) return false;
-               if (a.notCountryCodes && a.notCountryCodes.indexOf(countryCode) !== -1) return false;
-               return true;
-             });
-           }
-           const searchable = pool.filter(a => a.searchable !== false && a.suggestion !== true);
-           const suggestions = pool.filter(a => a.suggestion === true);
-
-           // matches value to preset.name
-           const leading_name = searchable
-             .filter(a => leading(a.name().toLowerCase()))
-             .sort(sortNames);
-
-           // matches value to preset suggestion name (original name is unhyphenated)
-           const leading_suggestions = suggestions
-             .filter(a => leadingStrict(a.originalName.toLowerCase()))
-             .sort(sortNames);
-
-           // matches value to preset.terms values
-           const leading_terms = searchable
-             .filter(a => (a.terms() || []).some(leading));
-
-           // matches value to preset.tags values
-           const leading_tag_values = searchable
-             .filter(a => Object.values(a.tags || {}).filter(val => val !== '*').some(leading));
-
-           // finds close matches to value in preset.name
-           const similar_name = searchable
-             .map(a => ({ preset: a, dist: utilEditDistance(value, a.name()) }))
-             .filter(a => a.dist + Math.min(value.length - a.preset.name().length, 0) < 3)
-             .sort((a, b) => a.dist - b.dist)
-             .map(a => a.preset);
-
-           // finds close matches to value to preset suggestion name (original name is unhyphenated)
-           const similar_suggestions = suggestions
-             .map(a => ({ preset: a, dist: utilEditDistance(value, a.originalName.toLowerCase()) }))
-             .filter(a => a.dist + Math.min(value.length - a.preset.originalName.length, 0) < 1)
-             .sort((a, b) => a.dist - b.dist)
-             .map(a => a.preset);
-
-           // finds close matches to value in preset.terms
-           const similar_terms = searchable
-             .filter(a => {
-               return (a.terms() || []).some(b => {
-                 return utilEditDistance(value, b) + Math.min(value.length - b.length, 0) < 3;
-               });
-             });
-
-           let results = leading_name.concat(
-             leading_suggestions,
-             leading_terms,
-             leading_tag_values,
-             similar_name,
-             similar_suggestions,
-             similar_terms
-           ).slice(0, MAXRESULTS - 1);
-
-           if (geometry) {
-             if (typeof geometry === 'string') {
-               results.push(_this.fallback(geometry));
-             } else {
-               geometry.forEach(geom => results.push(_this.fallback(geom)));
-             }
-           }
-
-           return presetCollection(utilArrayUniq(results));
-         };
-
-
-         return _this;
-       }
-
-       //
-       // `presetCategory` builds a `presetCollection` of member presets,
-       // decorated with some extra methods for searching and matching geometry
-       //
-       function presetCategory(categoryID, category, all) {
-         let _this = Object.assign({}, category);   // shallow copy
-
-         _this.id = categoryID;
-
-         _this.members = presetCollection(
-           category.members.map(presetID => all.item(presetID)).filter(Boolean)
-         );
-
-         _this.geometry = _this.members.collection
-           .reduce((acc, preset) => {
-             for (let i in preset.geometry) {
-               const geometry = preset.geometry[i];
-               if (acc.indexOf(geometry) === -1) {
-                 acc.push(geometry);
-               }
-             }
-             return acc;
-           }, []);
-
-         _this.matchGeometry = (geom) => _this.geometry.indexOf(geom) >= 0;
-
-         _this.matchAllGeometry = (geometries) => _this.members.collection
-           .some(preset => preset.matchAllGeometry(geometries));
-
-         _this.matchScore = () => -1;
-
-         _this.name = () => _t(`presets.categories.${categoryID}.name`, { 'default': categoryID });
-
-         _this.terms = () => [];
-
-
-         return _this;
-       }
-
-       //
-       // `presetField` decorates a given `field` Object
-       // with some extra methods for searching and matching geometry
-       //
-       function presetField(fieldID, field) {
-         let _this = Object.assign({}, field);   // shallow copy
-
-         _this.id = fieldID;
-
-         // for use in classes, element ids, css selectors
-         _this.safeid = utilSafeClassName(fieldID);
-
-         _this.matchGeometry = (geom) => !_this.geometry || _this.geometry.indexOf(geom) !== -1;
-
-         _this.matchAllGeometry = (geometries) => {
-           return !_this.geometry || geometries.every(geom => _this.geometry.indexOf(geom) !== -1);
-         };
-
-         _this.t = (scope, options) => _t(`presets.fields.${fieldID}.${scope}`, options);
-
-         _this.label = () => _this.overrideLabel || _this.t('label', { 'default': fieldID });
-
-         const _placeholder = _this.placeholder;
-         _this.placeholder = () => _this.t('placeholder', { 'default': _placeholder });
-
-         _this.originalTerms = (_this.terms || []).join();
-
-         _this.terms = () => _this.t('terms', { 'default': _this.originalTerms })
-           .toLowerCase().trim().split(/\s*,+\s*/);
-
-
-         return _this;
-       }
-
-       //
-       // `presetPreset` decorates a given `preset` Object
-       // with some extra methods for searching and matching geometry
-       //
-       function presetPreset(presetID, preset, addable, allFields, allPresets) {
-         allFields = allFields || {};
-         allPresets = allPresets || {};
-         let _this = Object.assign({}, preset);   // shallow copy
-         let _addable = addable || false;
-         let _resolvedFields;      // cache
-         let _resolvedMoreFields;  // cache
-
-         _this.id = presetID;
-
-         _this.safeid = utilSafeClassName(presetID);  // for use in css classes, selectors, element ids
-
-         _this.originalTerms = (_this.terms || []).join();
-
-         _this.originalName = _this.name || '';
-
-         _this.originalScore = _this.matchScore || 1;
-
-         _this.originalReference = _this.reference || {};
-
-         _this.originalFields = (_this.fields || []);
-
-         _this.originalMoreFields = (_this.moreFields || []);
-
-         _this.fields = () => _resolvedFields || (_resolvedFields = resolve('fields'));
-
-         _this.moreFields = () => _resolvedMoreFields || (_resolvedMoreFields = resolve('moreFields'));
-
-         _this.resetFields = () => _resolvedFields = _resolvedMoreFields = null;
-
-         _this.tags = _this.tags || {};
-
-         _this.addTags = _this.addTags || _this.tags;
-
-         _this.removeTags = _this.removeTags || _this.addTags;
-
-         _this.geometry = (_this.geometry || []);
-
-         _this.matchGeometry = (geom) => _this.geometry.indexOf(geom) >= 0;
-
-         _this.matchAllGeometry = (geoms) => geoms.every(_this.matchGeometry);
-
-         _this.matchScore = (entityTags) => {
-           const tags = _this.tags;
-           let seen = {};
-           let score = 0;
-
-           // match on tags
-           for (let k in tags) {
-             seen[k] = true;
-             if (entityTags[k] === tags[k]) {
-               score += _this.originalScore;
-             } else if (tags[k] === '*' && k in entityTags) {
-               score += _this.originalScore / 2;
-             } else {
-               return -1;
-             }
-           }
-
-           // boost score for additional matches in addTags - #6802
-           const addTags = _this.addTags;
-           for (let k in addTags) {
-             if (!seen[k] && entityTags[k] === addTags[k]) {
-               score += _this.originalScore;
-             }
-           }
-
-           return score;
-         };
-
-
-         let _textCache = {};
-         _this.t = (scope, options) => {
-           const textID = `presets.presets.${presetID}.${scope}`;
-           if (_textCache[textID]) return _textCache[textID];
-           return _textCache[textID] = _t(textID, options);
-         };
-
-
-         _this.name = () => {
-           if (_this.suggestion) {
-             let path = presetID.split('/');
-             path.pop();  // remove brand name
-             // NOTE: insert an en-dash, not a hypen (to avoid conflict with fr - nl names in Brussels etc)
-             return _this.originalName + ' – ' + _t('presets.presets.' + path.join('/') + '.name');
-           }
-           return _this.t('name', { 'default': _this.originalName });
-         };
-
-
-         _this.terms = () => _this.t('terms', { 'default': _this.originalTerms })
-           .toLowerCase().trim().split(/\s*,+\s*/);
-
-
-         _this.isFallback = () => {
-           const tagCount = Object.keys(_this.tags).length;
-           return tagCount === 0 || (tagCount === 1 && _this.tags.hasOwnProperty('area'));
-         };
-
-
-         _this.addable = function(val) {
-           if (!arguments.length) return _addable;
-           _addable = val;
-           return _this;
-         };
-
-
-         _this.reference = (geom) => {
-           // Lookup documentation on Wikidata...
-           const qid = _this.tags.wikidata || _this.tags['brand:wikidata'] || _this.tags['operator:wikidata'];
-           if (qid) {
-             return { qid: qid };
-           }
-
-           // Lookup documentation on OSM Wikibase...
-           let key = _this.originalReference.key || Object.keys(utilObjectOmit(_this.tags, 'name'))[0];
-           let value = _this.originalReference.value || _this.tags[key];
-
-           if (geom === 'relation' && key === 'type') {
-             if (value in _this.tags) {
-               key = value;
-               value = _this.tags[key];
-             } else {
-               return { rtype: value };
-             }
-           }
-
-           if (value === '*') {
-             return { key: key };
-           } else {
-             return { key: key, value: value };
-           }
-         };
-
-
-         _this.unsetTags = (tags, geometry, skipFieldDefaults) => {
-           tags = utilObjectOmit(tags, Object.keys(_this.removeTags));
-
-           if (geometry && !skipFieldDefaults) {
-             _this.fields().forEach(field => {
-               if (field.matchGeometry(geometry) && field.key && field.default === tags[field.key]) {
-                 delete tags[field.key];
-               }
-             });
-           }
-
-           delete tags.area;
-           return tags;
-         };
-
-
-         _this.setTags = (tags, geometry, skipFieldDefaults) => {
-           const addTags = _this.addTags;
-           tags = Object.assign({}, tags);   // shallow copy
-
-           for (let k in addTags) {
-             if (addTags[k] === '*') {
-               tags[k] = 'yes';
-             } else {
-               tags[k] = addTags[k];
-             }
-           }
-
-           // Add area=yes if necessary.
-           // This is necessary if the geometry is already an area (e.g. user drew an area) AND any of:
-           // 1. chosen preset could be either an area or a line (`barrier=city_wall`)
-           // 2. chosen preset doesn't have a key in osmAreaKeys (`railway=station`)
-           if (!addTags.hasOwnProperty('area')) {
-             delete tags.area;
-             if (geometry === 'area') {
-               let needsAreaTag = true;
-               if (_this.geometry.indexOf('line') === -1) {
-                 for (let k in addTags) {
-                   if (k in osmAreaKeys) {
-                     needsAreaTag = false;
-                     break;
-                   }
-                 }
-               }
-               if (needsAreaTag) {
-                 tags.area = 'yes';
-               }
-             }
-           }
-
-           if (geometry && !skipFieldDefaults) {
-             _this.fields().forEach(field => {
-               if (field.matchGeometry(geometry) && field.key && !tags[field.key] && field.default) {
-                 tags[field.key] = field.default;
-               }
-             });
-           }
-
-           return tags;
-         };
-
-
-         // For a preset without fields, use the fields of the parent preset.
-         // Replace {preset} placeholders with the fields of the specified presets.
-         function resolve(which) {
-           const fieldIDs = (which === 'fields' ? _this.originalFields : _this.originalMoreFields);
-           let resolved = [];
-
-           fieldIDs.forEach(fieldID => {
-             const match = fieldID.match(/\{(.*)\}/);
-             if (match !== null) {    // a presetID wrapped in braces {}
-               resolved = resolved.concat(inheritFields(match[1], which));
-             } else if (allFields[fieldID]) {    // a normal fieldID
-               resolved.push(allFields[fieldID]);
-             } else {
-               console.log(`Cannot resolve "${fieldID}" found in ${_this.id}.${which}`);  // eslint-disable-line no-console
-             }
-           });
-
-           // no fields resolved, so use the parent's if possible
-           if (!resolved.length) {
-             const endIndex = _this.id.lastIndexOf('/');
-             const parentID = endIndex && _this.id.substring(0, endIndex);
-             if (parentID) {
-               resolved = inheritFields(parentID, which);
-             }
-           }
-
-           return utilArrayUniq(resolved);
-
-
-           // returns an array of fields to inherit from the given presetID, if found
-           function inheritFields(presetID, which) {
-             const parent = allPresets[presetID];
-             if (!parent) return [];
-
-             if (which === 'fields') {
-               return parent.fields().filter(shouldInherit);
-             } else if (which === 'moreFields') {
-               return parent.moreFields();
-             } else {
-               return [];
-             }
-           }
-
-
-           // Skip `fields` for the keys which define the preset.
-           // These are usually `typeCombo` fields like `shop=*`
-           function shouldInherit(f) {
-             if (f.key && _this.tags[f.key] !== undefined &&
-               // inherit anyway if multiple values are allowed or just a checkbox
-               f.type !== 'multiCombo' && f.type !== 'semiCombo' && f.type !== 'check'
-             ) return false;
-
-             return true;
-           }
-         }
-
-
-         return _this;
-       }
-
-       let _mainPresetIndex = presetIndex(); // singleton
-
-       //
-       // `presetIndex` wraps a `presetCollection`
-       // with methods for loading new data and returning defaults
-       //
-       function presetIndex() {
-         const dispatch$1 = dispatch('favoritePreset', 'recentsChange');
-         const MAXRECENTS = 30;
-
-         // seed the preset lists with geometry fallbacks
-         const POINT = presetPreset('point', { name: 'Point', tags: {}, geometry: ['point', 'vertex'], matchScore: 0.1 } );
-         const LINE = presetPreset('line', { name: 'Line', tags: {}, geometry: ['line'], matchScore: 0.1 } );
-         const AREA = presetPreset('area', { name: 'Area', tags: { area: 'yes' }, geometry: ['area'], matchScore: 0.1 } );
-         const RELATION = presetPreset('relation', { name: 'Relation', tags: {}, geometry: ['relation'], matchScore: 0.1 } );
-
-         let _this = presetCollection([POINT, LINE, AREA, RELATION]);
-         let _presets = { point: POINT, line: LINE, area: AREA, relation: RELATION };
-
-         let _defaults = {
-           point: presetCollection([POINT]),
-           vertex: presetCollection([POINT]),
-           line: presetCollection([LINE]),
-           area: presetCollection([AREA]),
-           relation: presetCollection([RELATION])
-         };
-
-         let _fields = {};
-         let _categories = {};
-         let _universal = [];
-         let _addablePresetIDs = null;   // Set of preset IDs that the user can add
-         let _recents;
-         let _favorites;
-
-         // Index of presets by (geometry, tag key).
-         let _geometryIndex = { point: {}, vertex: {}, line: {}, area: {}, relation: {} };
-
-         let _loadPromise;
-
-         _this.ensureLoaded = () => {
-           if (_loadPromise) return _loadPromise;
-
-           return _loadPromise = Promise.all([
-               _mainFileFetcher.get('preset_categories'),
-               _mainFileFetcher.get('preset_defaults'),
-               _mainFileFetcher.get('preset_presets'),
-               _mainFileFetcher.get('preset_fields')
-             ])
-             .then(vals => {
-               _this.merge({
-                 categories: vals[0],
-                 defaults: vals[1],
-                 presets: vals[2],
-                 fields: vals[3]
-               });
-               osmSetAreaKeys(_this.areaKeys());
-               osmSetPointTags(_this.pointTags());
-               osmSetVertexTags(_this.vertexTags());
-             });
-         };
-
-
-         _this.merge = (d) => {
-           // Merge Fields
-           if (d.fields) {
-             Object.keys(d.fields).forEach(fieldID => {
-               const f = d.fields[fieldID];
-               if (f) {   // add or replace
-                 _fields[fieldID] = presetField(fieldID, f);
-               } else {   // remove
-                 delete _fields[fieldID];
-               }
-             });
-           }
-
-           // Merge Presets
-           if (d.presets) {
-             Object.keys(d.presets).forEach(presetID => {
-               const p = d.presets[presetID];
-               if (p) {   // add or replace
-                 const isAddable = !_addablePresetIDs || _addablePresetIDs.has(presetID);
-                 _presets[presetID] = presetPreset(presetID, p, isAddable, _fields, _presets);
-               } else {   // remove (but not if it's a fallback)
-                 const existing = _presets[presetID];
-                 if (existing && !existing.isFallback()) {
-                   delete _presets[presetID];
-                 }
-               }
-             });
-           }
-
-           // Need to rebuild _this.collection before loading categories
-           _this.collection = Object.values(_presets).concat(Object.values(_categories));
-
-           // Merge Categories
-           if (d.categories) {
-             Object.keys(d.categories).forEach(categoryID => {
-               const c = d.categories[categoryID];
-               if (c) {   // add or replace
-                 _categories[categoryID] = presetCategory(categoryID, c, _this);
-               } else {   // remove
-                 delete _categories[categoryID];
-               }
-             });
-           }
-
-           // Rebuild _this.collection after loading categories
-           _this.collection = Object.values(_presets).concat(Object.values(_categories));
-
-           // Merge Defaults
-           if (d.defaults) {
-             Object.keys(d.defaults).forEach(geometry => {
-               const def = d.defaults[geometry];
-               if (Array.isArray(def)) {   // add or replace
-                 _defaults[geometry] = presetCollection(
-                   def.map(id => _presets[id] || _categories[id]).filter(Boolean)
-                 );
-               } else {   // remove
-                 delete _defaults[geometry];
-               }
-             });
-           }
-
-           // Rebuild universal fields array
-           _universal = Object.values(_fields).filter(field => field.universal);
-
-           // Reset all the preset fields - they'll need to be resolved again
-           Object.values(_presets).forEach(preset => preset.resetFields());
-
-           // Rebuild geometry index
-           _geometryIndex = { point: {}, vertex: {}, line: {}, area: {}, relation: {} };
-           _this.collection.forEach(preset => {
-             (preset.geometry || []).forEach(geometry => {
-               let g = _geometryIndex[geometry];
-               for (let key in preset.tags) {
-                 (g[key] = g[key] || []).push(preset);
-               }
-             });
-           });
-
-           return _this;
-         };
-
-
-         _this.match = (entity, resolver) => {
-           return resolver.transient(entity, 'presetMatch', () => {
-             let geometry = entity.geometry(resolver);
-             // Treat entities on addr:interpolation lines as points, not vertices - #3241
-             if (geometry === 'vertex' && entity.isOnAddressLine(resolver)) {
-               geometry = 'point';
-             }
-             return _this.matchTags(entity.tags, geometry);
-           });
-         };
-
-
-         _this.matchTags = (tags, geometry) => {
-           const geometryMatches = _geometryIndex[geometry];
-           let address;
-           let best = -1;
-           let match;
-
-           for (let k in tags) {
-             // If any part of an address is present, allow fallback to "Address" preset - #4353
-             if (/^addr:/.test(k) && geometryMatches['addr:*']) {
-               address = geometryMatches['addr:*'][0];
-             }
-
-             const keyMatches = geometryMatches[k];
-             if (!keyMatches) continue;
-
-             for (let i = 0; i < keyMatches.length; i++) {
-               const score = keyMatches[i].matchScore(tags);
-               if (score > best) {
-                 best = score;
-                 match = keyMatches[i];
-               }
-             }
-           }
-
-           if (address && (!match || match.isFallback())) {
-             match = address;
-           }
-           return match || _this.fallback(geometry);
-         };
-
-
-         _this.allowsVertex = (entity, resolver) => {
-           if (entity.type !== 'node') return false;
-           if (Object.keys(entity.tags).length === 0) return true;
-
-           return resolver.transient(entity, 'vertexMatch', () => {
-             // address lines allow vertices to act as standalone points
-             if (entity.isOnAddressLine(resolver)) return true;
-
-             const geometries = osmNodeGeometriesForTags(entity.tags);
-             if (geometries.vertex) return true;
-             if (geometries.point) return false;
-             // allow vertices for unspecified points
-             return true;
-           });
-         };
-
-
-         // Because of the open nature of tagging, iD will never have a complete
-         // list of tags used in OSM, so we want it to have logic like "assume
-         // that a closed way with an amenity tag is an area, unless the amenity
-         // is one of these specific types". This function computes a structure
-         // that allows testing of such conditions, based on the presets designated
-         // as as supporting (or not supporting) the area geometry.
-         //
-         // The returned object L is a keeplist/discardlist of tags. A closed way
-         // with a tag (k, v) is considered to be an area if `k in L && !(v in L[k])`
-         // (see `Way#isArea()`). In other words, the keys of L form the keeplist,
-         // and the subkeys form the discardlist.
-         _this.areaKeys = () => {
-           // The ignore list is for keys that imply lines. (We always add `area=yes` for exceptions)
-           const ignore = ['barrier', 'highway', 'footway', 'railway', 'junction', 'type'];
-           let areaKeys = {};
-
-           // ignore name-suggestion-index and deprecated presets
-           const presets = _this.collection.filter(p => !p.suggestion && !p.replacement);
-
-           // keeplist
-           presets.forEach(p => {
-             let key;
-             for (key in p.tags) break;  // pick the first tag
-             if (!key) return;
-             if (ignore.indexOf(key) !== -1) return;
-
-             if (p.geometry.indexOf('area') !== -1) {    // probably an area..
-               areaKeys[key] = areaKeys[key] || {};
-             }
-           });
-
-           // discardlist
-           presets.forEach(p => {
-             let key;
-             for (key in p.addTags) {
-               // examine all addTags to get a better sense of what can be tagged on lines - #6800
-               const value = p.addTags[key];
-               if (key in areaKeys &&                    // probably an area...
-                 p.geometry.indexOf('line') !== -1 &&    // but sometimes a line
-                 value !== '*') {
-                 areaKeys[key][value] = true;
-               }
-             }
-           });
-
-           return areaKeys;
-         };
-
-
-         _this.pointTags = () => {
-           return _this.collection.reduce((pointTags, d) => {
-             // ignore name-suggestion-index, deprecated, and generic presets
-             if (d.suggestion || d.replacement || d.searchable === false) return pointTags;
-
-             // only care about the primary tag
-             let key;
-             for (key in d.tags) break;  // pick the first tag
-             if (!key) return pointTags;
-
-             // if this can be a point
-             if (d.geometry.indexOf('point') !== -1) {
-               pointTags[key] = pointTags[key] || {};
-               pointTags[key][d.tags[key]] = true;
-             }
-             return pointTags;
-           }, {});
-         };
-
-
-         _this.vertexTags = () => {
-           return _this.collection.reduce((vertexTags, d) => {
-             // ignore name-suggestion-index, deprecated, and generic presets
-             if (d.suggestion || d.replacement || d.searchable === false) return vertexTags;
-
-             // only care about the primary tag
-             let key;
-             for (key in d.tags) break;   // pick the first tag
-             if (!key) return vertexTags;
-
-             // if this can be a vertex
-             if (d.geometry.indexOf('vertex') !== -1) {
-               vertexTags[key] = vertexTags[key] || {};
-               vertexTags[key][d.tags[key]] = true;
-             }
-             return vertexTags;
-           }, {});
-         };
-
-
-         _this.field = (id) => _fields[id];
-
-         _this.universal = () => _universal;
-
-
-         _this.defaults = (geometry, n, startWithRecents) => {
-           let recents = [];
-           if (startWithRecents) {
-             recents = _this.recent().matchGeometry(geometry).collection.slice(0, 4);
-           }
-           let defaults;
-           if (_addablePresetIDs) {
-             defaults = Array.from(_addablePresetIDs).map(function(id) {
-               var preset = _this.item(id);
-               if (preset && preset.matchGeometry(geometry)) return preset;
-               return null;
-             }).filter(Boolean);
-           } else {
-             defaults = _defaults[geometry].collection.concat(_this.fallback(geometry));
-           }
-
-           return presetCollection(
-             utilArrayUniq(recents.concat(defaults)).slice(0, n - 1)
-           );
-         };
-
-         // pass a Set of addable preset ids
-         _this.addablePresetIDs = function(val) {
-           if (!arguments.length) return _addablePresetIDs;
-
-           // accept and convert arrays
-           if (Array.isArray(val)) val = new Set(val);
-
-           _addablePresetIDs = val;
-           if (_addablePresetIDs) {   // reset all presets
-             _this.collection.forEach(p => {
-               // categories aren't addable
-               if (p.addable) p.addable(_addablePresetIDs.has(p.id));
-             });
-           } else {
-             _this.collection.forEach(p => {
-               if (p.addable) p.addable(true);
-             });
-           }
-
-           return _this;
-         };
-
-
-         _this.recent = () => {
-           return presetCollection(
-             utilArrayUniq(_this.getRecents().map(d => d.preset))
-           );
-         };
-
-
-         function RibbonItem(preset, source) {
-           let item = {};
-           item.preset = preset;
-           item.source = source;
-
-           item.isFavorite = () => item.source === 'favorite';
-           item.isRecent = () => item.source === 'recent';
-           item.matches = (preset) => item.preset.id === preset.id;
-           item.minified = () => ({ pID: item.preset.id });
-
-           return item;
-         }
-
-
-         function ribbonItemForMinified(d, source) {
-           if (d && d.pID) {
-             const preset = _this.item(d.pID);
-             if (!preset) return null;
-             return RibbonItem(preset, source);
-           }
-           return null;
-         }
-
-
-         _this.getGenericRibbonItems = () => {
-           return ['point', 'line', 'area'].map(id => RibbonItem(_this.item(id), 'generic'));
-         };
-
-
-         _this.getAddable = () => {
-             if (!_addablePresetIDs) return [];
-
-             return _addablePresetIDs.map((id) => {
-               const preset = _this.item(id);
-               if (preset) {
-                 return RibbonItem(preset, 'addable');
-               }
-             }).filter(Boolean);
-         };
-
-
-         function setRecents(items) {
-           _recents = items;
-           const minifiedItems = items.map(d => d.minified());
-           corePreferences('preset_recents', JSON.stringify(minifiedItems));
-           dispatch$1.call('recentsChange');
-         }
-
-
-         _this.getRecents = () => {
-           if (!_recents) {
-             // fetch from local storage
-             _recents = (JSON.parse(corePreferences('preset_recents')) || [])
-               .reduce((acc, d) => {
-                 let item = ribbonItemForMinified(d, 'recent');
-                 if (item && item.preset.addable()) acc.push(item);
-                 return acc;
-               }, []);
-           }
-           return _recents;
-         };
-
-
-         _this.addRecent = (preset, besidePreset, after) => {
-           const recents = _this.getRecents();
-
-           const beforeItem = _this.recentMatching(besidePreset);
-           let toIndex = recents.indexOf(beforeItem);
-           if (after) toIndex += 1;
-
-           const newItem = RibbonItem(preset, 'recent');
-           recents.splice(toIndex, 0, newItem);
-           setRecents(recents);
-         };
-
-
-         _this.removeRecent = (preset) => {
-           const item = _this.recentMatching(preset);
-           if (item) {
-             let items = _this.getRecents();
-             items.splice(items.indexOf(item), 1);
-             setRecents(items);
-           }
-         };
-
-
-         _this.recentMatching = (preset) => {
-           const items = _this.getRecents();
-           for (let i in items) {
-             if (items[i].matches(preset)) {
-               return items[i];
-             }
-           }
-           return null;
-         };
-
-
-         _this.moveItem = (items, fromIndex, toIndex) => {
-           if (fromIndex === toIndex ||
-             fromIndex < 0 || toIndex < 0 ||
-             fromIndex >= items.length || toIndex >= items.length
-           ) return null;
-
-           items.splice(toIndex, 0, items.splice(fromIndex, 1)[0]);
-           return items;
-         };
-
-
-         _this.moveRecent = (item, beforeItem) => {
-           const recents = _this.getRecents();
-           const fromIndex = recents.indexOf(item);
-           const toIndex = recents.indexOf(beforeItem);
-           const items = _this.moveItem(recents, fromIndex, toIndex);
-           if (items) setRecents(items);
-         };
-
-
-         _this.setMostRecent = (preset) => {
-           if (preset.searchable === false) return;
-
-           let items = _this.getRecents();
-           let item = _this.recentMatching(preset);
-           if (item) {
-             items.splice(items.indexOf(item), 1);
-           } else {
-             item = RibbonItem(preset, 'recent');
-           }
-
-           // remove the last recent (first in, first out)
-           while (items.length >= MAXRECENTS) {
-             items.pop();
-           }
-
-           // prepend array
-           items.unshift(item);
-           setRecents(items);
-         };
-
-         function setFavorites(items) {
-           _favorites = items;
-           const minifiedItems = items.map(d => d.minified());
-           corePreferences('preset_favorites', JSON.stringify(minifiedItems));
-
-           // call update
-           dispatch$1.call('favoritePreset');
-         }
-
-         _this.addFavorite = (preset, besidePreset, after) => {
-             const favorites = _this.getFavorites();
-
-             const beforeItem = _this.favoriteMatching(besidePreset);
-             let toIndex = favorites.indexOf(beforeItem);
-             if (after) toIndex += 1;
-
-             const newItem = RibbonItem(preset, 'favorite');
-             favorites.splice(toIndex, 0, newItem);
-             setFavorites(favorites);
-         };
-
-         _this.toggleFavorite = (preset) => {
-           const favs = _this.getFavorites();
-           const favorite = _this.favoriteMatching(preset);
-           if (favorite) {
-             favs.splice(favs.indexOf(favorite), 1);
-           } else {
-             // only allow 10 favorites
-             if (favs.length === 10) {
-                 // remove the last favorite (last in, first out)
-                 favs.pop();
-             }
-             // append array
-             favs.push(RibbonItem(preset, 'favorite'));
-           }
-           setFavorites(favs);
-         };
-
-
-         _this.removeFavorite = (preset) => {
-           const item = _this.favoriteMatching(preset);
-           if (item) {
-             const items = _this.getFavorites();
-             items.splice(items.indexOf(item), 1);
-             setFavorites(items);
-           }
-         };
-
-
-         _this.getFavorites = () => {
-           if (!_favorites) {
-
-             // fetch from local storage
-             let rawFavorites = JSON.parse(corePreferences('preset_favorites'));
-
-             if (!rawFavorites) {
-               rawFavorites = [];
-               corePreferences('preset_favorites', JSON.stringify(rawFavorites));
-             }
-
-             _favorites = rawFavorites.reduce((output, d) => {
-               const item = ribbonItemForMinified(d, 'favorite');
-               if (item && item.preset.addable()) output.push(item);
-               return output;
-             }, []);
-           }
-           return _favorites;
-         };
-
-
-         _this.favoriteMatching = (preset) => {
-           const favs = _this.getFavorites();
-           for (let index in favs) {
-             if (favs[index].matches(preset)) {
-               return favs[index];
-             }
-           }
-           return null;
-         };
-
-
-         return utilRebind(_this, dispatch$1, 'on');
-       }
-
-       function utilTagText(entity) {
-           var obj = (entity && entity.tags) || {};
-           return Object.keys(obj)
-               .map(function(k) { return k + '=' + obj[k]; })
-               .join(', ');
-       }
-
-
-       function utilTotalExtent(array, graph) {
-           var extent = geoExtent();
-           var val, entity;
-           for (var i = 0; i < array.length; i++) {
-               val = array[i];
-               entity = typeof val === 'string' ? graph.hasEntity(val) : val;
-               if (entity) {
-                   extent._extend(entity.extent(graph));
-               }
-           }
-           return extent;
-       }
-
-
-       function utilTagDiff(oldTags, newTags) {
-           var tagDiff = [];
-           var keys = utilArrayUnion(Object.keys(oldTags), Object.keys(newTags)).sort();
-           keys.forEach(function(k) {
-               var oldVal = oldTags[k];
-               var newVal = newTags[k];
-
-               if ((oldVal || oldVal === '') && (newVal === undefined || newVal !== oldVal)) {
-                   tagDiff.push({
-                       type: '-',
-                       key: k,
-                       oldVal: oldVal,
-                       newVal: newVal,
-                       display: '- ' + k + '=' + oldVal
-                   });
-               }
-               if ((newVal || newVal === '') && (oldVal === undefined || newVal !== oldVal)) {
-                   tagDiff.push({
-                       type: '+',
-                       key: k,
-                       oldVal: oldVal,
-                       newVal: newVal,
-                       display: '+ ' + k + '=' + newVal
-                   });
-               }
-           });
-           return tagDiff;
-       }
-
-
-       function utilEntitySelector(ids) {
-           return ids.length ? '.' + ids.join(',.') : 'nothing';
-       }
-
-
-       // returns an selector to select entity ids for:
-       //  - entityIDs passed in
-       //  - shallow descendant entityIDs for any of those entities that are relations
-       function utilEntityOrMemberSelector(ids, graph) {
-           var seen = new Set(ids);
-           ids.forEach(collectShallowDescendants);
-           return utilEntitySelector(Array.from(seen));
-
-           function collectShallowDescendants(id) {
-               var entity = graph.hasEntity(id);
-               if (!entity || entity.type !== 'relation') return;
-
-               entity.members
-                   .map(function(member) { return member.id; })
-                   .forEach(function(id) { seen.add(id); });
-           }
-       }
-
-
-       // returns an selector to select entity ids for:
-       //  - entityIDs passed in
-       //  - deep descendant entityIDs for any of those entities that are relations
-       function utilEntityOrDeepMemberSelector(ids, graph) {
-           return utilEntitySelector(utilEntityAndDeepMemberIDs(ids, graph));
-       }
-
-
-       // returns an selector to select entity ids for:
-       //  - entityIDs passed in
-       //  - deep descendant entityIDs for any of those entities that are relations
-       function utilEntityAndDeepMemberIDs(ids, graph) {
-           var seen = new Set();
-           ids.forEach(collectDeepDescendants);
-           return Array.from(seen);
-
-           function collectDeepDescendants(id) {
-               if (seen.has(id)) return;
-               seen.add(id);
-
-               var entity = graph.hasEntity(id);
-               if (!entity || entity.type !== 'relation') return;
-
-               entity.members
-                   .map(function(member) { return member.id; })
-                   .forEach(collectDeepDescendants);   // recurse
-           }
-       }
-
-       // returns an selector to select entity ids for:
-       //  - deep descendant entityIDs for any of those entities that are relations
-       function utilDeepMemberSelector(ids, graph, skipMultipolgonMembers) {
-           var idsSet = new Set(ids);
-           var seen = new Set();
-           var returners = new Set();
-           ids.forEach(collectDeepDescendants);
-           return utilEntitySelector(Array.from(returners));
-
-           function collectDeepDescendants(id) {
-               if (seen.has(id)) return;
-               seen.add(id);
-
-               if (!idsSet.has(id)) {
-                   returners.add(id);
-               }
-
-               var entity = graph.hasEntity(id);
-               if (!entity || entity.type !== 'relation') return;
-               if (skipMultipolgonMembers && entity.isMultipolygon()) return;
-               entity.members
-                   .map(function(member) { return member.id; })
-                   .forEach(collectDeepDescendants);   // recurse
-           }
-       }
-
-
-       // Adds or removes highlight styling for the specified entities
-       function utilHighlightEntities(ids, highlighted, context) {
-           context.surface()
-               .selectAll(utilEntityOrDeepMemberSelector(ids, context.graph()))
-               .classed('highlighted', highlighted);
-       }
-
-
-       // returns an Array that is the union of:
-       //  - nodes for any nodeIDs passed in
-       //  - child nodes of any wayIDs passed in
-       //  - descendant member and child nodes of relationIDs passed in
-       function utilGetAllNodes(ids, graph) {
-           var seen = new Set();
-           var nodes = new Set();
-
-           ids.forEach(collectNodes);
-           return Array.from(nodes);
-
-           function collectNodes(id) {
-               if (seen.has(id)) return;
-               seen.add(id);
-
-               var entity = graph.hasEntity(id);
-               if (!entity) return;
-
-               if (entity.type === 'node') {
-                   nodes.add(entity);
-               } else if (entity.type === 'way') {
-                   entity.nodes.forEach(collectNodes);
-               } else {
-                   entity.members
-                       .map(function(member) { return member.id; })
-                       .forEach(collectNodes);   // recurse
-               }
-           }
-       }
-
-
-       function utilDisplayName(entity) {
-           var localizedNameKey = 'name:' + _mainLocalizer.languageCode().toLowerCase();
-           var name = entity.tags[localizedNameKey] || entity.tags.name || '';
-           var network = entity.tags.cycle_network || entity.tags.network;
-
-           if (!name && entity.tags.ref) {
-               name = entity.tags.ref;
-               if (network) {
-                   name = network + ' ' + name;
-               }
-           }
-
-           return name;
-       }
-
-
-       function utilDisplayNameForPath(entity) {
-           var name = utilDisplayName(entity);
-           var isFirefox = utilDetect().browser.toLowerCase().indexOf('firefox') > -1;
-
-           if (!isFirefox && name && rtlRegex.test(name)) {
-               name = fixRTLTextForSvg(name);
-           }
-
-           return name;
-       }
-
-
-       function utilDisplayType(id) {
-           return {
-               n: _t('inspector.node'),
-               w: _t('inspector.way'),
-               r: _t('inspector.relation')
-           }[id.charAt(0)];
-       }
-
-
-       function utilDisplayLabel(entity, graph) {
-           var displayName = utilDisplayName(entity);
-           if (displayName) {
-               // use the display name if there is one
-               return displayName;
-           }
-           var preset = _mainPresetIndex.match(entity, graph);
-           if (preset && preset.name()) {
-               // use the preset name if there is a match
-               return preset.name();
-           }
-           // fallback to the display type (node/way/relation)
-           return utilDisplayType(entity.id);
-       }
-
-
-       function utilEntityRoot(entityType) {
-           return {
-               node: 'n',
-               way: 'w',
-               relation: 'r'
-           }[entityType];
-       }
-
-
-       // Returns a single object containing the tags of all the given entities.
-       // Example:
-       // {
-       //   highway: 'service',
-       //   service: 'parking_aisle'
-       // }
-       //           +
-       // {
-       //   highway: 'service',
-       //   service: 'driveway',
-       //   width: '3'
-       // }
-       //           =
-       // {
-       //   highway: 'service',
-       //   service: [ 'driveway', 'parking_aisle' ],
-       //   width: [ '3', undefined ]
-       // }
-       function utilCombinedTags(entityIDs, graph) {
-
-           var tags = {};
-           var tagCounts = {};
-           var allKeys = new Set();
-
-           var entities = entityIDs.map(function(entityID) {
-               return graph.hasEntity(entityID);
-           }).filter(Boolean);
-
-           // gather the aggregate keys
-           entities.forEach(function(entity) {
-               var keys = Object.keys(entity.tags).filter(Boolean);
-               keys.forEach(function(key) {
-                   allKeys.add(key);
-               });
-           });
-
-           entities.forEach(function(entity) {
-
-               allKeys.forEach(function(key) {
-
-                   var value = entity.tags[key]; // purposely allow `undefined`
-
-                   if (!tags.hasOwnProperty(key)) {
-                       // first value, set as raw
-                       tags[key] = value;
-                   } else {
-                       if (!Array.isArray(tags[key])) {
-                           if (tags[key] !== value) {
-                               // first alternate value, replace single value with array
-                               tags[key] = [tags[key], value];
-                           }
-                       } else { // type is array
-                           if (tags[key].indexOf(value) === -1) {
-                               // subsequent alternate value, add to array
-                               tags[key].push(value);
-                           }
-                       }
-                   }
-
-                   var tagHash = key + '=' + value;
-                   if (!tagCounts[tagHash]) tagCounts[tagHash] = 0;
-                   tagCounts[tagHash] += 1;
-               });
-           });
-
-           for (var key in tags) {
-               if (!Array.isArray(tags[key])) continue;
-
-               // sort values by frequency then alphabetically
-               tags[key] = tags[key].sort(function(val1, val2) {
-                   var key = key; // capture
-                   var count2 = tagCounts[key + '=' + val2];
-                   var count1 = tagCounts[key + '=' + val1];
-                   if (count2 !== count1) {
-                       return count2 - count1;
-                   }
-                   if (val2 && val1) {
-                       return val1.localeCompare(val2);
-                   }
-                   return val1 ? 1 : -1;
-               });
-           }
-
-           return tags;
-       }
-
-
-       function utilStringQs(str) {
-           var i = 0;  // advance past any leading '?' or '#' characters
-           while (i < str.length && (str[i] === '?' || str[i] === '#')) i++;
-           str = str.slice(i);
-
-           return str.split('&').reduce(function(obj, pair){
-               var parts = pair.split('=');
-               if (parts.length === 2) {
-                   obj[parts[0]] = (null === parts[1]) ? '' : decodeURIComponent(parts[1]);
-               }
-               return obj;
-           }, {});
-       }
-
-
-       function utilQsString(obj, noencode) {
-           // encode everything except special characters used in certain hash parameters:
-           // "/" in map states, ":", ",", {" and "}" in background
-           function softEncode(s) {
-               return encodeURIComponent(s).replace(/(%2F|%3A|%2C|%7B|%7D)/g, decodeURIComponent);
-           }
-
-           return Object.keys(obj).sort().map(function(key) {
-               return encodeURIComponent(key) + '=' + (
-                   noencode ? softEncode(obj[key]) : encodeURIComponent(obj[key]));
-           }).join('&');
-       }
-
-
-       function utilPrefixDOMProperty(property) {
-           var prefixes = ['webkit', 'ms', 'moz', 'o'];
-           var i = -1;
-           var n = prefixes.length;
-           var s = document.body;
-
-           if (property in s)
-               return property;
-
-           property = property.substr(0, 1).toUpperCase() + property.substr(1);
-
-           while (++i < n) {
-               if (prefixes[i] + property in s) {
-                   return prefixes[i] + property;
-               }
-           }
-
-           return false;
-       }
-
-
-       function utilPrefixCSSProperty(property) {
-           var prefixes = ['webkit', 'ms', 'Moz', 'O'];
-           var i = -1;
-           var n = prefixes.length;
-           var s = document.body.style;
-
-           if (property.toLowerCase() in s) {
-               return property.toLowerCase();
-           }
-
-           while (++i < n) {
-               if (prefixes[i] + property in s) {
-                   return '-' + prefixes[i].toLowerCase() + property.replace(/([A-Z])/g, '-$1').toLowerCase();
-               }
-           }
-
-           return false;
-       }
-
-
-       var transformProperty;
-       function utilSetTransform(el, x, y, scale) {
-           var prop = transformProperty = transformProperty || utilPrefixCSSProperty('Transform');
-           var translate = utilDetect().opera ? 'translate('   + x + 'px,' + y + 'px)'
-               : 'translate3d(' + x + 'px,' + y + 'px,0)';
-           return el.style(prop, translate + (scale ? ' scale(' + scale + ')' : ''));
-       }
-
-
-       // Calculates Levenshtein distance between two strings
-       // see:  https://en.wikipedia.org/wiki/Levenshtein_distance
-       // first converts the strings to lowercase and replaces diacritic marks with ascii equivalents.
-       function utilEditDistance(a, b) {
-           a = remove$1(a.toLowerCase());
-           b = remove$1(b.toLowerCase());
-           if (a.length === 0) return b.length;
-           if (b.length === 0) return a.length;
-           var matrix = [];
-           for (var i = 0; i <= b.length; i++) { matrix[i] = [i]; }
-           for (var j = 0; j <= a.length; j++) { matrix[0][j] = j; }
-           for (i = 1; i <= b.length; i++) {
-               for (j = 1; j <= a.length; j++) {
-                   if (b.charAt(i-1) === a.charAt(j-1)) {
-                       matrix[i][j] = matrix[i-1][j-1];
-                   } else {
-                       matrix[i][j] = Math.min(matrix[i-1][j-1] + 1, // substitution
-                           Math.min(matrix[i][j-1] + 1, // insertion
-                           matrix[i-1][j] + 1)); // deletion
-                   }
-               }
-           }
-           return matrix[b.length][a.length];
-       }
-
-
-       // a d3.mouse-alike which
-       // 1. Only works on HTML elements, not SVG
-       // 2. Does not cause style recalculation
-       function utilFastMouse(container) {
-           var rect = container.getBoundingClientRect();
-           var rectLeft = rect.left;
-           var rectTop = rect.top;
-           var clientLeft = +container.clientLeft;
-           var clientTop = +container.clientTop;
-           return function(e) {
-               return [
-                   e.clientX - rectLeft - clientLeft,
-                   e.clientY - rectTop - clientTop];
-           };
-       }
-
-
-       function utilAsyncMap(inputs, func, callback) {
-           var remaining = inputs.length;
-           var results = [];
-           var errors = [];
-
-           inputs.forEach(function(d, i) {
-               func(d, function done(err, data) {
-                   errors[i] = err;
-                   results[i] = data;
-                   remaining--;
-                   if (!remaining) callback(errors, results);
-               });
-           });
-       }
-
-
-       // wraps an index to an interval [0..length-1]
-       function utilWrap(index, length) {
-           if (index < 0) {
-               index += Math.ceil(-index/length)*length;
-           }
-           return index % length;
-       }
-
-
-       /**
-        * a replacement for functor
-        *
-        * @param {*} value any value
-        * @returns {Function} a function that returns that value or the value if it's a function
-        */
-       function utilFunctor(value) {
-           if (typeof value === 'function') return value;
-           return function() {
-               return value;
-           };
-       }
-
-
-       function utilNoAuto(selection) {
-           var isText = (selection.size() && selection.node().tagName.toLowerCase() === 'textarea');
-
-           return selection
-               // assign 'new-password' even for non-password fields to prevent browsers (Chrome) ignoring 'off'
-               .attr('autocomplete', 'new-password')
-               .attr('autocorrect', 'off')
-               .attr('autocapitalize', 'off')
-               .attr('spellcheck', isText ? 'true' : 'false');
-       }
-
-
-       // https://stackoverflow.com/questions/194846/is-there-any-kind-of-hash-code-function-in-javascript
-       // https://werxltd.com/wp/2010/05/13/javascript-implementation-of-javas-string-hashcode-method/
-       function utilHashcode(str) {
-           var hash = 0;
-           if (str.length === 0) {
-               return hash;
-           }
-           for (var i = 0; i < str.length; i++) {
-               var char = str.charCodeAt(i);
-               hash = ((hash << 5) - hash) + char;
-               hash = hash & hash; // Convert to 32bit integer
-           }
-           return hash;
-       }
-
-       // Returns version of `str` with all runs of special characters replaced by `_`;
-       // suitable for HTML ids, classes, selectors, etc.
-       function utilSafeClassName(str) {
-           return str.toLowerCase().replace(/[^a-z0-9]+/g, '_');
-       }
-
-       // Returns string based on `val` that is highly unlikely to collide with an id
-       // used previously or that's present elsewhere in the document. Useful for preventing
-       // browser-provided autofills or when embedding iD on pages with unknown elements.
-       function utilUniqueDomId(val) {
-           return 'ideditor-' + utilSafeClassName(val.toString()) + '-' + new Date().getTime().toString();
-       }
-
-       // Returns the length of `str` in unicode characters. This can be less than
-       // `String.length()` since a single unicode character can be composed of multiple
-       // JavaScript UTF-16 code units.
-       function utilUnicodeCharsCount(str) {
-           // Native ES2015 implementations of `Array.from` split strings into unicode characters
-           return Array.from(str).length;
-       }
-
-       // Returns a new string representing `str` cut from its start to `limit` length
-       // in unicode characters. Note that this runs the risk of splitting graphemes.
-       function utilUnicodeCharsTruncated(str, limit) {
-           return Array.from(str).slice(0, limit).join('');
-       }
-
-       function osmEntity(attrs) {
-           // For prototypal inheritance.
-           if (this instanceof osmEntity) return;
-
-           // Create the appropriate subtype.
-           if (attrs && attrs.type) {
-               return osmEntity[attrs.type].apply(this, arguments);
-           } else if (attrs && attrs.id) {
-               return osmEntity[osmEntity.id.type(attrs.id)].apply(this, arguments);
-           }
-
-           // Initialize a generic Entity (used only in tests).
-           return (new osmEntity()).initialize(arguments);
-       }
-
-
-       osmEntity.id = function(type) {
-           return osmEntity.id.fromOSM(type, osmEntity.id.next[type]--);
-       };
-
-
-       osmEntity.id.next = {
-           changeset: -1, node: -1, way: -1, relation: -1
-       };
-
-
-       osmEntity.id.fromOSM = function(type, id) {
-           return type[0] + id;
-       };
-
-
-       osmEntity.id.toOSM = function(id) {
-           return id.slice(1);
-       };
-
-
-       osmEntity.id.type = function(id) {
-           return { 'c': 'changeset', 'n': 'node', 'w': 'way', 'r': 'relation' }[id[0]];
-       };
-
-
-       // A function suitable for use as the second argument to d3.selection#data().
-       osmEntity.key = function(entity) {
-           return entity.id + 'v' + (entity.v || 0);
-       };
-
-       var _deprecatedTagValuesByKey;
-
-       osmEntity.deprecatedTagValuesByKey = function(dataDeprecated) {
-           if (!_deprecatedTagValuesByKey) {
-               _deprecatedTagValuesByKey = {};
-               dataDeprecated.forEach(function(d) {
-                   var oldKeys = Object.keys(d.old);
-                   if (oldKeys.length === 1) {
-                       var oldKey = oldKeys[0];
-                       var oldValue = d.old[oldKey];
-                       if (oldValue !== '*') {
-                           if (!_deprecatedTagValuesByKey[oldKey]) {
-                               _deprecatedTagValuesByKey[oldKey] = [oldValue];
-                           } else {
-                               _deprecatedTagValuesByKey[oldKey].push(oldValue);
-                           }
-                       }
-                   }
-               });
-           }
-           return _deprecatedTagValuesByKey;
-       };
-
-
-       osmEntity.prototype = {
-
-           tags: {},
-
-
-           initialize: function(sources) {
-               for (var i = 0; i < sources.length; ++i) {
-                   var source = sources[i];
-                   for (var prop in source) {
-                       if (Object.prototype.hasOwnProperty.call(source, prop)) {
-                           if (source[prop] === undefined) {
-                               delete this[prop];
-                           } else {
-                               this[prop] = source[prop];
-                           }
-                       }
-                   }
-               }
-
-               if (!this.id && this.type) {
-                   this.id = osmEntity.id(this.type);
-               }
-               if (!this.hasOwnProperty('visible')) {
-                   this.visible = true;
-               }
-
-               return this;
-           },
-
-
-           copy: function(resolver, copies) {
-               if (copies[this.id])
-                   return copies[this.id];
-
-               var copy = osmEntity(this, { id: undefined, user: undefined, version: undefined });
-               copies[this.id] = copy;
-
-               return copy;
-           },
-
-
-           osmId: function() {
-               return osmEntity.id.toOSM(this.id);
-           },
-
-
-           isNew: function() {
-               return this.osmId() < 0;
-           },
-
-
-           update: function(attrs) {
-               return osmEntity(this, attrs, { v: 1 + (this.v || 0) });
-           },
-
-
-           mergeTags: function(tags) {
-               var merged = Object.assign({}, this.tags);   // shallow copy
-               var changed = false;
-               for (var k in tags) {
-                   var t1 = merged[k];
-                   var t2 = tags[k];
-                   if (!t1) {
-                       changed = true;
-                       merged[k] = t2;
-                   } else if (t1 !== t2) {
-                       changed = true;
-                       merged[k] = utilUnicodeCharsTruncated(
-                           utilArrayUnion(t1.split(/;\s*/), t2.split(/;\s*/)).join(';'),
-                           255 // avoid exceeding character limit; see also services/osm.js -> maxCharsForTagValue()
-                       );
-                   }
-               }
-               return changed ? this.update({ tags: merged }) : this;
-           },
-
-
-           intersects: function(extent, resolver) {
-               return this.extent(resolver).intersects(extent);
-           },
-
-
-           hasNonGeometryTags: function() {
-               return Object.keys(this.tags).some(function(k) { return k !== 'area'; });
-           },
-
-           hasParentRelations: function(resolver) {
-               return resolver.parentRelations(this).length > 0;
-           },
-
-           hasInterestingTags: function() {
-               return Object.keys(this.tags).some(osmIsInterestingTag);
-           },
-
-           hasWikidata: function() {
-               return !!this.tags.wikidata || !!this.tags['brand:wikidata'];
-           },
-
-           isHighwayIntersection: function() {
-               return false;
-           },
-
-           isDegenerate: function() {
-               return true;
-           },
-
-           deprecatedTags: function(dataDeprecated) {
-               var tags = this.tags;
-
-               // if there are no tags, none can be deprecated
-               if (Object.keys(tags).length === 0) return [];
-
-               var deprecated = [];
-               dataDeprecated.forEach(function(d) {
-                   var oldKeys = Object.keys(d.old);
-                   var matchesDeprecatedTags = oldKeys.every(function(oldKey) {
-                       if (!tags[oldKey]) return false;
-                       if (d.old[oldKey] === '*') return true;
-
-                       var vals = tags[oldKey].split(';').filter(Boolean);
-                       if (vals.length === 0) {
-                           return false;
-                       } else if (vals.length > 1) {
-                           return vals.indexOf(d.old[oldKey]) !== -1;
-                       } else {
-                           if (tags[oldKey] === d.old[oldKey]) {
-                               if (d.replace && d.old[oldKey] === d.replace[oldKey]) {
-                                   var replaceKeys = Object.keys(d.replace);
-                                   return !replaceKeys.every(function(replaceKey) {
-                                       return tags[replaceKey] === d.replace[replaceKey];
-                                   });
-                               } else {
-                                   return true;
-                               }
-                           }
-                       }
-                       return false;
-                   });
-                   if (matchesDeprecatedTags) {
-                       deprecated.push(d);
-                   }
-               });
-
-               return deprecated;
-           }
-       };
-
-       function osmLanes(entity) {
-           if (entity.type !== 'way') return null;
-           if (!entity.tags.highway) return null;
-
-           var tags = entity.tags;
-           var isOneWay = entity.isOneWay();
-           var laneCount = getLaneCount(tags, isOneWay);
-           var maxspeed = parseMaxspeed(tags);
-
-           var laneDirections = parseLaneDirections(tags, isOneWay, laneCount);
-           var forward = laneDirections.forward;
-           var backward = laneDirections.backward;
-           var bothways = laneDirections.bothways;
-
-           // parse the piped string 'x|y|z' format
-           var turnLanes = {};
-           turnLanes.unspecified = parseTurnLanes(tags['turn:lanes']);
-           turnLanes.forward = parseTurnLanes(tags['turn:lanes:forward']);
-           turnLanes.backward = parseTurnLanes(tags['turn:lanes:backward']);
-
-           var maxspeedLanes = {};
-           maxspeedLanes.unspecified = parseMaxspeedLanes(tags['maxspeed:lanes'], maxspeed);
-           maxspeedLanes.forward = parseMaxspeedLanes(tags['maxspeed:lanes:forward'], maxspeed);
-           maxspeedLanes.backward = parseMaxspeedLanes(tags['maxspeed:lanes:backward'], maxspeed);
-
-           var psvLanes = {};
-           psvLanes.unspecified = parseMiscLanes(tags['psv:lanes']);
-           psvLanes.forward = parseMiscLanes(tags['psv:lanes:forward']);
-           psvLanes.backward = parseMiscLanes(tags['psv:lanes:backward']);
-
-           var busLanes = {};
-           busLanes.unspecified = parseMiscLanes(tags['bus:lanes']);
-           busLanes.forward = parseMiscLanes(tags['bus:lanes:forward']);
-           busLanes.backward = parseMiscLanes(tags['bus:lanes:backward']);
-
-           var taxiLanes = {};
-           taxiLanes.unspecified = parseMiscLanes(tags['taxi:lanes']);
-           taxiLanes.forward = parseMiscLanes(tags['taxi:lanes:forward']);
-           taxiLanes.backward = parseMiscLanes(tags['taxi:lanes:backward']);
-
-           var hovLanes = {};
-           hovLanes.unspecified = parseMiscLanes(tags['hov:lanes']);
-           hovLanes.forward = parseMiscLanes(tags['hov:lanes:forward']);
-           hovLanes.backward = parseMiscLanes(tags['hov:lanes:backward']);
-
-           var hgvLanes = {};
-           hgvLanes.unspecified = parseMiscLanes(tags['hgv:lanes']);
-           hgvLanes.forward = parseMiscLanes(tags['hgv:lanes:forward']);
-           hgvLanes.backward = parseMiscLanes(tags['hgv:lanes:backward']);
-
-           var bicyclewayLanes = {};
-           bicyclewayLanes.unspecified = parseBicycleWay(tags['bicycleway:lanes']);
-           bicyclewayLanes.forward = parseBicycleWay(tags['bicycleway:lanes:forward']);
-           bicyclewayLanes.backward = parseBicycleWay(tags['bicycleway:lanes:backward']);
-
-           var lanesObj = {
-               forward: [],
-               backward: [],
-               unspecified: []
-           };
-
-           // map forward/backward/unspecified of each lane type to lanesObj
-           mapToLanesObj(lanesObj, turnLanes, 'turnLane');
-           mapToLanesObj(lanesObj, maxspeedLanes, 'maxspeed');
-           mapToLanesObj(lanesObj, psvLanes, 'psv');
-           mapToLanesObj(lanesObj, busLanes, 'bus');
-           mapToLanesObj(lanesObj, taxiLanes, 'taxi');
-           mapToLanesObj(lanesObj, hovLanes, 'hov');
-           mapToLanesObj(lanesObj, hgvLanes, 'hgv');
-           mapToLanesObj(lanesObj, bicyclewayLanes, 'bicycleway');
-
-           return {
-               metadata: {
-                   count: laneCount,
-                   oneway: isOneWay,
-                   forward: forward,
-                   backward: backward,
-                   bothways: bothways,
-                   turnLanes: turnLanes,
-                   maxspeed: maxspeed,
-                   maxspeedLanes: maxspeedLanes,
-                   psvLanes: psvLanes,
-                   busLanes: busLanes,
-                   taxiLanes: taxiLanes,
-                   hovLanes: hovLanes,
-                   hgvLanes: hgvLanes,
-                   bicyclewayLanes: bicyclewayLanes
-               },
-               lanes: lanesObj
-           };
-       }
-
-
-       function getLaneCount(tags, isOneWay) {
-           var count;
-           if (tags.lanes) {
-               count = parseInt(tags.lanes, 10);
-               if (count > 0) {
-                   return count;
-               }
-           }
-
-
-           switch (tags.highway) {
-               case 'trunk':
-               case 'motorway':
-                   count = isOneWay ? 2 : 4;
-                   break;
-               default:
-                   count = isOneWay ? 1 : 2;
-                   break;
-           }
-
-           return count;
-       }
-
-
-       function parseMaxspeed(tags) {
-           var maxspeed = tags.maxspeed;
-           if (!maxspeed) return;
-
-           var maxspeedRegex = /^([0-9][\.0-9]+?)(?:[ ]?(?:km\/h|kmh|kph|mph|knots))?$/;
-           if (!maxspeedRegex.test(maxspeed)) return;
-
-           return parseInt(maxspeed, 10);
-       }
-
-
-       function parseLaneDirections(tags, isOneWay, laneCount) {
-           var forward = parseInt(tags['lanes:forward'], 10);
-           var backward = parseInt(tags['lanes:backward'], 10);
-           var bothways = parseInt(tags['lanes:both_ways'], 10) > 0 ? 1 : 0;
-
-           if (parseInt(tags.oneway, 10) === -1) {
-               forward = 0;
-               bothways = 0;
-               backward = laneCount;
-           }
-           else if (isOneWay) {
-               forward = laneCount;
-               bothways = 0;
-               backward = 0;
-           }
-           else if (isNaN(forward) && isNaN(backward)) {
-               backward = Math.floor((laneCount - bothways) / 2);
-               forward = laneCount - bothways - backward;
-           }
-           else if (isNaN(forward)) {
-               if (backward > laneCount - bothways) {
-                   backward = laneCount - bothways;
-               }
-               forward = laneCount - bothways - backward;
-           }
-           else if (isNaN(backward)) {
-               if (forward > laneCount - bothways) {
-                   forward = laneCount - bothways;
-               }
-               backward = laneCount - bothways - forward;
-           }
-           return {
-               forward: forward,
-               backward: backward,
-               bothways: bothways
-           };
-       }
-
-
-       function parseTurnLanes(tag){
-           if (!tag) return;
-
-           var validValues = [
-               'left', 'slight_left', 'sharp_left', 'through', 'right', 'slight_right',
-               'sharp_right', 'reverse', 'merge_to_left', 'merge_to_right', 'none'
-           ];
-
-           return tag.split('|')
-               .map(function (s) {
-                   if (s === '') s = 'none';
-                   return s.split(';')
-                       .map(function (d) {
-                           return validValues.indexOf(d) === -1 ? 'unknown': d;
-                       });
-               });
-       }
-
-
-       function parseMaxspeedLanes(tag, maxspeed) {
-           if (!tag) return;
-
-           return tag.split('|')
-               .map(function (s) {
-                   if (s === 'none') return s;
-                   var m = parseInt(s, 10);
-                   if (s === '' || m === maxspeed) return null;
-                   return isNaN(m) ? 'unknown': m;
-               });
-       }
-
-
-       function parseMiscLanes(tag) {
-           if (!tag) return;
-
-           var validValues = [
-               'yes', 'no', 'designated'
-           ];
-
-           return tag.split('|')
-               .map(function (s) {
-                   if (s === '') s = 'no';
-                   return validValues.indexOf(s) === -1 ? 'unknown': s;
-               });
-       }
-
-
-       function parseBicycleWay(tag) {
-           if (!tag) return;
-
-           var validValues = [
-               'yes', 'no', 'designated', 'lane'
-           ];
-
-           return tag.split('|')
-               .map(function (s) {
-                   if (s === '') s = 'no';
-                   return validValues.indexOf(s) === -1 ? 'unknown': s;
-               });
-       }
-
-
-       function mapToLanesObj(lanesObj, data, key) {
-           if (data.forward) data.forward.forEach(function(l, i) {
-               if (!lanesObj.forward[i]) lanesObj.forward[i] = {};
-               lanesObj.forward[i][key] = l;
-           });
-           if (data.backward) data.backward.forEach(function(l, i) {
-               if (!lanesObj.backward[i]) lanesObj.backward[i] = {};
-               lanesObj.backward[i][key] = l;
-           });
-           if (data.unspecified) data.unspecified.forEach(function(l, i) {
-               if (!lanesObj.unspecified[i]) lanesObj.unspecified[i] = {};
-               lanesObj.unspecified[i][key] = l;
-           });
-       }
-
-       function osmWay() {
-           if (!(this instanceof osmWay)) {
-               return (new osmWay()).initialize(arguments);
-           } else if (arguments.length) {
-               this.initialize(arguments);
-           }
-       }
-
-
-       osmEntity.way = osmWay;
-
-       osmWay.prototype = Object.create(osmEntity.prototype);
-
-
-       Object.assign(osmWay.prototype, {
-           type: 'way',
-           nodes: [],
-
-
-           copy: function(resolver, copies) {
-               if (copies[this.id]) return copies[this.id];
-
-               var copy = osmEntity.prototype.copy.call(this, resolver, copies);
-
-               var nodes = this.nodes.map(function(id) {
-                   return resolver.entity(id).copy(resolver, copies).id;
-               });
-
-               copy = copy.update({ nodes: nodes });
-               copies[this.id] = copy;
-
-               return copy;
-           },
-
-
-           extent: function(resolver) {
-               return resolver.transient(this, 'extent', function() {
-                   var extent = geoExtent();
-                   for (var i = 0; i < this.nodes.length; i++) {
-                       var node = resolver.hasEntity(this.nodes[i]);
-                       if (node) {
-                           extent._extend(node.extent());
-                       }
-                   }
-                   return extent;
-               });
-           },
-
-
-           first: function() {
-               return this.nodes[0];
-           },
-
-
-           last: function() {
-               return this.nodes[this.nodes.length - 1];
-           },
-
-
-           contains: function(node) {
-               return this.nodes.indexOf(node) >= 0;
-           },
-
-
-           affix: function(node) {
-               if (this.nodes[0] === node) return 'prefix';
-               if (this.nodes[this.nodes.length - 1] === node) return 'suffix';
-           },
-
-
-           layer: function() {
-               // explicit layer tag, clamp between -10, 10..
-               if (isFinite(this.tags.layer)) {
-                   return Math.max(-10, Math.min(+(this.tags.layer), 10));
-               }
-
-               // implied layer tag..
-               if (this.tags.covered === 'yes') return -1;
-               if (this.tags.location === 'overground') return 1;
-               if (this.tags.location === 'underground') return -1;
-               if (this.tags.location === 'underwater') return -10;
-
-               if (this.tags.power === 'line') return 10;
-               if (this.tags.power === 'minor_line') return 10;
-               if (this.tags.aerialway) return 10;
-               if (this.tags.bridge) return 1;
-               if (this.tags.cutting) return -1;
-               if (this.tags.tunnel) return -1;
-               if (this.tags.waterway) return -1;
-               if (this.tags.man_made === 'pipeline') return -10;
-               if (this.tags.boundary) return -10;
-               return 0;
-           },
-
-
-           // the approximate width of the line based on its tags except its `width` tag
-           impliedLineWidthMeters: function() {
-               var averageWidths = {
-                   highway: { // width is for single lane
-                       motorway: 5, motorway_link: 5, trunk: 4.5, trunk_link: 4.5,
-                       primary: 4, secondary: 4, tertiary: 4,
-                       primary_link: 4, secondary_link: 4, tertiary_link: 4,
-                       unclassified: 4, road: 4, living_street: 4, bus_guideway: 4, pedestrian: 4,
-                       residential: 3.5, service: 3.5, track: 3, cycleway: 2.5,
-                       bridleway: 2, corridor: 2, steps: 2, path: 1.5, footway: 1.5
-                   },
-                   railway: { // width includes ties and rail bed, not just track gauge
-                       rail: 2.5, light_rail: 2.5, tram: 2.5, subway: 2.5,
-                       monorail: 2.5, funicular: 2.5, disused: 2.5, preserved: 2.5,
-                       miniature: 1.5, narrow_gauge: 1.5
-                   },
-                   waterway: {
-                       river: 50, canal: 25, stream: 5, tidal_channel: 5, fish_pass: 2.5, drain: 2.5, ditch: 1.5
-                   }
-               };
-               for (var key in averageWidths) {
-                   if (this.tags[key] && averageWidths[key][this.tags[key]]) {
-                       var width = averageWidths[key][this.tags[key]];
-                       if (key === 'highway') {
-                           var laneCount = this.tags.lanes && parseInt(this.tags.lanes, 10);
-                           if (!laneCount) laneCount = this.isOneWay() ? 1 : 2;
-
-                           return width * laneCount;
-                       }
-                       return width;
-                   }
-               }
-               return null;
-           },
-
-
-           isOneWay: function() {
-               // explicit oneway tag..
-               var values = {
-                   'yes': true,
-                   '1': true,
-                   '-1': true,
-                   'reversible': true,
-                   'alternating': true,
-                   'no': false,
-                   '0': false
-               };
-               if (values[this.tags.oneway] !== undefined) {
-                   return values[this.tags.oneway];
-               }
-
-               // implied oneway tag..
-               for (var key in this.tags) {
-                   if (key in osmOneWayTags && (this.tags[key] in osmOneWayTags[key]))
-                       return true;
-               }
-               return false;
-           },
-
-           // Some identifier for tag that implies that this way is "sided",
-           // i.e. the right side is the 'inside' (e.g. the right side of a
-           // natural=cliff is lower).
-           sidednessIdentifier: function() {
-               for (var key in this.tags) {
-                   var value = this.tags[key];
-                   if (key in osmRightSideIsInsideTags && (value in osmRightSideIsInsideTags[key])) {
-                       if (osmRightSideIsInsideTags[key][value] === true) {
-                           return key;
-                       } else {
-                           // if the map's value is something other than a
-                           // literal true, we should use it so we can
-                           // special case some keys (e.g. natural=coastline
-                           // is handled differently to other naturals).
-                           return osmRightSideIsInsideTags[key][value];
-                       }
-                   }
-               }
-
-               return null;
-           },
-
-           isSided: function() {
-               if (this.tags.two_sided === 'yes') {
-                   return false;
-               }
-
-               return this.sidednessIdentifier() !== null;
-           },
-
-           lanes: function() {
-               return osmLanes(this);
-           },
-
-
-           isClosed: function() {
-               return this.nodes.length > 1 && this.first() === this.last();
-           },
-
-
-           isConvex: function(resolver) {
-               if (!this.isClosed() || this.isDegenerate()) return null;
-
-               var nodes = utilArrayUniq(resolver.childNodes(this));
-               var coords = nodes.map(function(n) { return n.loc; });
-               var curr = 0;
-               var prev = 0;
-
-               for (var i = 0; i < coords.length; i++) {
-                   var o = coords[(i+1) % coords.length];
-                   var a = coords[i];
-                   var b = coords[(i+2) % coords.length];
-                   var res = geoVecCross(a, b, o);
-
-                   curr = (res > 0) ? 1 : (res < 0) ? -1 : 0;
-                   if (curr === 0) {
-                       continue;
-                   } else if (prev && curr !== prev) {
-                       return false;
-                   }
-                   prev = curr;
-               }
-               return true;
-           },
-
-           // returns an object with the tag that implies this is an area, if any
-           tagSuggestingArea: function() {
-               return osmTagSuggestingArea(this.tags);
-           },
-
-           isArea: function() {
-               if (this.tags.area === 'yes')
-                   return true;
-               if (!this.isClosed() || this.tags.area === 'no')
-                   return false;
-               return this.tagSuggestingArea() !== null;
-           },
-
-
-           isDegenerate: function() {
-               return (new Set(this.nodes).size < (this.isArea() ? 3 : 2));
-           },
-
-
-           areAdjacent: function(n1, n2) {
-               for (var i = 0; i < this.nodes.length; i++) {
-                   if (this.nodes[i] === n1) {
-                       if (this.nodes[i - 1] === n2) return true;
-                       if (this.nodes[i + 1] === n2) return true;
-                   }
-               }
-               return false;
-           },
-
-
-           geometry: function(graph) {
-               return graph.transient(this, 'geometry', function() {
-                   return this.isArea() ? 'area' : 'line';
-               });
-           },
-
-
-           // returns an array of objects representing the segments between the nodes in this way
-           segments: function(graph) {
-
-               function segmentExtent(graph) {
-                   var n1 = graph.hasEntity(this.nodes[0]);
-                   var n2 = graph.hasEntity(this.nodes[1]);
-                   return n1 && n2 && geoExtent([
-                       [
-                           Math.min(n1.loc[0], n2.loc[0]),
-                           Math.min(n1.loc[1], n2.loc[1])
-                       ],
-                       [
-                           Math.max(n1.loc[0], n2.loc[0]),
-                           Math.max(n1.loc[1], n2.loc[1])
-                       ]
-                   ]);
-               }
-
-               return graph.transient(this, 'segments', function() {
-                   var segments = [];
-                   for (var i = 0; i < this.nodes.length - 1; i++) {
-                       segments.push({
-                           id: this.id + '-' + i,
-                           wayId: this.id,
-                           index: i,
-                           nodes: [this.nodes[i], this.nodes[i + 1]],
-                           extent: segmentExtent
-                       });
-                   }
-                   return segments;
-               });
-           },
-
-
-           // If this way is not closed, append the beginning node to the end of the nodelist to close it.
-           close: function() {
-               if (this.isClosed() || !this.nodes.length) return this;
-
-               var nodes = this.nodes.slice();
-               nodes = nodes.filter(noRepeatNodes);
-               nodes.push(nodes[0]);
-               return this.update({ nodes: nodes });
-           },
-
-
-           // If this way is closed, remove any connector nodes from the end of the nodelist to unclose it.
-           unclose: function() {
-               if (!this.isClosed()) return this;
-
-               var nodes = this.nodes.slice();
-               var connector = this.first();
-               var i = nodes.length - 1;
-
-               // remove trailing connectors..
-               while (i > 0 && nodes.length > 1 && nodes[i] === connector) {
-                   nodes.splice(i, 1);
-                   i = nodes.length - 1;
-               }
-
-               nodes = nodes.filter(noRepeatNodes);
-               return this.update({ nodes: nodes });
-           },
-
-
-           // Adds a node (id) in front of the node which is currently at position index.
-           // If index is undefined, the node will be added to the end of the way for linear ways,
-           //   or just before the final connecting node for circular ways.
-           // Consecutive duplicates are eliminated including existing ones.
-           // Circularity is always preserved when adding a node.
-           addNode: function(id, index) {
-               var nodes = this.nodes.slice();
-               var isClosed = this.isClosed();
-               var max = isClosed ? nodes.length - 1 : nodes.length;
-
-               if (index === undefined) {
-                   index = max;
-               }
-
-               if (index < 0 || index > max) {
-                   throw new RangeError('index ' + index + ' out of range 0..' + max);
-               }
-
-               // If this is a closed way, remove all connector nodes except the first one
-               // (there may be duplicates) and adjust index if necessary..
-               if (isClosed) {
-                   var connector = this.first();
-
-                   // leading connectors..
-                   var i = 1;
-                   while (i < nodes.length && nodes.length > 2 && nodes[i] === connector) {
-                       nodes.splice(i, 1);
-                       if (index > i) index--;
-                   }
-
-                   // trailing connectors..
-                   i = nodes.length - 1;
-                   while (i > 0 && nodes.length > 1 && nodes[i] === connector) {
-                       nodes.splice(i, 1);
-                       if (index > i) index--;
-                       i = nodes.length - 1;
-                   }
-               }
-
-               nodes.splice(index, 0, id);
-               nodes = nodes.filter(noRepeatNodes);
-
-               // If the way was closed before, append a connector node to keep it closed..
-               if (isClosed && (nodes.length === 1 || nodes[0] !== nodes[nodes.length - 1])) {
-                   nodes.push(nodes[0]);
-               }
-
-               return this.update({ nodes: nodes });
-           },
-
-
-           // Replaces the node which is currently at position index with the given node (id).
-           // Consecutive duplicates are eliminated including existing ones.
-           // Circularity is preserved when updating a node.
-           updateNode: function(id, index) {
-               var nodes = this.nodes.slice();
-               var isClosed = this.isClosed();
-               var max = nodes.length - 1;
-
-               if (index === undefined || index < 0 || index > max) {
-                   throw new RangeError('index ' + index + ' out of range 0..' + max);
-               }
-
-               // If this is a closed way, remove all connector nodes except the first one
-               // (there may be duplicates) and adjust index if necessary..
-               if (isClosed) {
-                   var connector = this.first();
-
-                   // leading connectors..
-                   var i = 1;
-                   while (i < nodes.length && nodes.length > 2 && nodes[i] === connector) {
-                       nodes.splice(i, 1);
-                       if (index > i) index--;
-                   }
-
-                   // trailing connectors..
-                   i = nodes.length - 1;
-                   while (i > 0 && nodes.length > 1 && nodes[i] === connector) {
-                       nodes.splice(i, 1);
-                       if (index === i) index = 0;  // update leading connector instead
-                       i = nodes.length - 1;
-                   }
-               }
-
-               nodes.splice(index, 1, id);
-               nodes = nodes.filter(noRepeatNodes);
-
-               // If the way was closed before, append a connector node to keep it closed..
-               if (isClosed && (nodes.length === 1 || nodes[0] !== nodes[nodes.length - 1])) {
-                   nodes.push(nodes[0]);
-               }
-
-               return this.update({nodes: nodes});
-           },
-
-
-           // Replaces each occurrence of node id needle with replacement.
-           // Consecutive duplicates are eliminated including existing ones.
-           // Circularity is preserved.
-           replaceNode: function(needleID, replacementID) {
-               var nodes = this.nodes.slice();
-               var isClosed = this.isClosed();
-
-               for (var i = 0; i < nodes.length; i++) {
-                   if (nodes[i] === needleID) {
-                       nodes[i] = replacementID;
-                   }
-               }
-
-               nodes = nodes.filter(noRepeatNodes);
-
-               // If the way was closed before, append a connector node to keep it closed..
-               if (isClosed && (nodes.length === 1 || nodes[0] !== nodes[nodes.length - 1])) {
-                   nodes.push(nodes[0]);
-               }
-
-               return this.update({nodes: nodes});
-           },
-
-
-           // Removes each occurrence of node id.
-           // Consecutive duplicates are eliminated including existing ones.
-           // Circularity is preserved.
-           removeNode: function(id) {
-               var nodes = this.nodes.slice();
-               var isClosed = this.isClosed();
-
-               nodes = nodes
-                   .filter(function(node) { return node !== id; })
-                   .filter(noRepeatNodes);
-
-               // If the way was closed before, append a connector node to keep it closed..
-               if (isClosed && (nodes.length === 1 || nodes[0] !== nodes[nodes.length - 1])) {
-                   nodes.push(nodes[0]);
-               }
-
-               return this.update({nodes: nodes});
-           },
-
-
-           asJXON: function(changeset_id) {
-               var r = {
-                   way: {
-                       '@id': this.osmId(),
-                       '@version': this.version || 0,
-                       nd: this.nodes.map(function(id) {
-                           return { keyAttributes: { ref: osmEntity.id.toOSM(id) } };
-                       }, this),
-                       tag: Object.keys(this.tags).map(function(k) {
-                           return { keyAttributes: { k: k, v: this.tags[k] } };
-                       }, this)
-                   }
-               };
-               if (changeset_id) {
-                   r.way['@changeset'] = changeset_id;
-               }
-               return r;
-           },
-
-
-           asGeoJSON: function(resolver) {
-               return resolver.transient(this, 'GeoJSON', function() {
-                   var coordinates = resolver.childNodes(this)
-                       .map(function(n) { return n.loc; });
-
-                   if (this.isArea() && this.isClosed()) {
-                       return {
-                           type: 'Polygon',
-                           coordinates: [coordinates]
-                       };
-                   } else {
-                       return {
-                           type: 'LineString',
-                           coordinates: coordinates
-                       };
-                   }
-               });
-           },
-
-
-           area: function(resolver) {
-               return resolver.transient(this, 'area', function() {
-                   var nodes = resolver.childNodes(this);
-
-                   var json = {
-                       type: 'Polygon',
-                       coordinates: [ nodes.map(function(n) { return n.loc; }) ]
-                   };
-
-                   if (!this.isClosed() && nodes.length) {
-                       json.coordinates[0].push(nodes[0].loc);
-                   }
-
-                   var area = d3_geoArea(json);
-
-                   // Heuristic for detecting counterclockwise winding order. Assumes
-                   // that OpenStreetMap polygons are not hemisphere-spanning.
-                   if (area > 2 * Math.PI) {
-                       json.coordinates[0] = json.coordinates[0].reverse();
-                       area = d3_geoArea(json);
-                   }
-
-                   return isNaN(area) ? 0 : area;
-               });
-           }
-       });
-
-
-       // Filter function to eliminate consecutive duplicates.
-       function noRepeatNodes(node, i, arr) {
-           return i === 0 || node !== arr[i - 1];
-       }
-
-       // "Old" multipolyons, previously known as "simple" multipolygons, are as follows:
-       //
-       // 1. Relation tagged with `type=multipolygon` and no interesting tags.
-       // 2. One and only one member with the `outer` role. Must be a way with interesting tags.
-       // 3. No members without a role.
-       //
-       // Old multipolygons are no longer recommended but are still rendered as areas by iD.
-
-       function osmOldMultipolygonOuterMemberOfRelation(entity, graph) {
-           if (entity.type !== 'relation' ||
-               !entity.isMultipolygon()
-               || Object.keys(entity.tags).filter(osmIsInterestingTag).length > 1) {
-               return false;
-           }
-
-           var outerMember;
-           for (var memberIndex in entity.members) {
-               var member = entity.members[memberIndex];
-               if (!member.role || member.role === 'outer') {
-                   if (outerMember) return false;
-                   if (member.type !== 'way') return false;
-                   if (!graph.hasEntity(member.id)) return false;
-
-                   outerMember = graph.entity(member.id);
-
-                   if (Object.keys(outerMember.tags).filter(osmIsInterestingTag).length === 0) {
-                       return false;
-                   }
-               }
-           }
-
-           return outerMember;
-       }
-
-       // For fixing up rendering of multipolygons with tags on the outer member.
-       // https://github.com/openstreetmap/iD/issues/613
-       function osmIsOldMultipolygonOuterMember(entity, graph) {
-           if (entity.type !== 'way' || Object.keys(entity.tags).filter(osmIsInterestingTag).length === 0)
-               return false;
-
-           var parents = graph.parentRelations(entity);
-           if (parents.length !== 1)
-               return false;
-
-           var parent = parents[0];
-           if (!parent.isMultipolygon() || Object.keys(parent.tags).filter(osmIsInterestingTag).length > 1)
-               return false;
-
-           var members = parent.members, member;
-           for (var i = 0; i < members.length; i++) {
-               member = members[i];
-               if (member.id === entity.id && member.role && member.role !== 'outer')
-                   return false; // Not outer member
-               if (member.id !== entity.id && (!member.role || member.role === 'outer'))
-                   return false; // Not a simple multipolygon
-           }
-
-           return parent;
-       }
-
-
-       function osmOldMultipolygonOuterMember(entity, graph) {
-           if (entity.type !== 'way')
-               return false;
-
-           var parents = graph.parentRelations(entity);
-           if (parents.length !== 1)
-               return false;
-
-           var parent = parents[0];
-           if (!parent.isMultipolygon() || Object.keys(parent.tags).filter(osmIsInterestingTag).length > 1)
-               return false;
-
-           var members = parent.members, member, outerMember;
-           for (var i = 0; i < members.length; i++) {
-               member = members[i];
-               if (!member.role || member.role === 'outer') {
-                   if (outerMember)
-                       return false; // Not a simple multipolygon
-                   outerMember = member;
-               }
-           }
-
-           if (!outerMember)
-               return false;
-
-           var outerEntity = graph.hasEntity(outerMember.id);
-           if (!outerEntity || !Object.keys(outerEntity.tags).filter(osmIsInterestingTag).length)
-               return false;
-
-           return outerEntity;
-       }
-
-
-       // Join `toJoin` array into sequences of connecting ways.
-
-       // Segments which share identical start/end nodes will, as much as possible,
-       // be connected with each other.
-       //
-       // The return value is a nested array. Each constituent array contains elements
-       // of `toJoin` which have been determined to connect.
-       //
-       // Each consitituent array also has a `nodes` property whose value is an
-       // ordered array of member nodes, with appropriate order reversal and
-       // start/end coordinate de-duplication.
-       //
-       // Members of `toJoin` must have, at minimum, `type` and `id` properties.
-       // Thus either an array of `osmWay`s or a relation member array may be used.
-       //
-       // If an member is an `osmWay`, its tags and childnodes may be reversed via
-       // `actionReverse` in the output.
-       //
-       // The returned sequences array also has an `actions` array property, containing
-       // any reversal actions that should be applied to the graph, should the calling
-       // code attempt to actually join the given ways.
-       //
-       // Incomplete members (those for which `graph.hasEntity(element.id)` returns
-       // false) and non-way members are ignored.
-       //
-       function osmJoinWays(toJoin, graph) {
-           function resolve(member) {
-               return graph.childNodes(graph.entity(member.id));
-           }
-
-           function reverse(item) {
-               var action = actionReverse(item.id, { reverseOneway: true });
-               sequences.actions.push(action);
-               return (item instanceof osmWay) ? action(graph).entity(item.id) : item;
-           }
-
-           // make a copy containing only the items to join
-           toJoin = toJoin.filter(function(member) {
-               return member.type === 'way' && graph.hasEntity(member.id);
-           });
-
-           // Are the things we are joining relation members or `osmWays`?
-           // If `osmWays`, skip the "prefer a forward path" code below (see #4872)
-           var i;
-           var joinAsMembers = true;
-           for (i = 0; i < toJoin.length; i++) {
-               if (toJoin[i] instanceof osmWay) {
-                   joinAsMembers = false;
-                   break;
-               }
-           }
-
-           var sequences = [];
-           sequences.actions = [];
-
-           while (toJoin.length) {
-               // start a new sequence
-               var item = toJoin.shift();
-               var currWays = [item];
-               var currNodes = resolve(item).slice();
-               var doneSequence = false;
-
-               // add to it
-               while (toJoin.length && !doneSequence) {
-                   var start = currNodes[0];
-                   var end = currNodes[currNodes.length - 1];
-                   var fn = null;
-                   var nodes = null;
-
-                   // Find the next way/member to join.
-                   for (i = 0; i < toJoin.length; i++) {
-                       item = toJoin[i];
-                       nodes = resolve(item);
-
-                       // (for member ordering only, not way ordering - see #4872)
-                       // Strongly prefer to generate a forward path that preserves the order
-                       // of the members array. For multipolygons and most relations, member
-                       // order does not matter - but for routes, it does. (see #4589)
-                       // If we started this sequence backwards (i.e. next member way attaches to
-                       // the start node and not the end node), reverse the initial way before continuing.
-                       if (joinAsMembers && currWays.length === 1 && nodes[0] !== end && nodes[nodes.length - 1] !== end &&
-                           (nodes[nodes.length - 1] === start || nodes[0] === start)
-                       ) {
-                           currWays[0] = reverse(currWays[0]);
-                           currNodes.reverse();
-                           start = currNodes[0];
-                           end = currNodes[currNodes.length - 1];
-                       }
-
-                       if (nodes[0] === end) {
-                           fn = currNodes.push;               // join to end
-                           nodes = nodes.slice(1);
-                           break;
-                       } else if (nodes[nodes.length - 1] === end) {
-                           fn = currNodes.push;               // join to end
-                           nodes = nodes.slice(0, -1).reverse();
-                           item = reverse(item);
-                           break;
-                       } else if (nodes[nodes.length - 1] === start) {
-                           fn = currNodes.unshift;            // join to beginning
-                           nodes = nodes.slice(0, -1);
-                           break;
-                       } else if (nodes[0] === start) {
-                           fn = currNodes.unshift;            // join to beginning
-                           nodes = nodes.slice(1).reverse();
-                           item = reverse(item);
-                           break;
-                       } else {
-                           fn = nodes = null;
-                       }
-                   }
-
-                   if (!nodes) {     // couldn't find a joinable way/member
-                       doneSequence = true;
-                       break;
-                   }
-
-                   fn.apply(currWays, [item]);
-                   fn.apply(currNodes, nodes);
-
-                   toJoin.splice(i, 1);
-               }
-
-               currWays.nodes = currNodes;
-               sequences.push(currWays);
-           }
-
-           return sequences;
-       }
-
-       function actionAddMember(relationId, member, memberIndex, insertPair) {
-
-           return function action(graph) {
-               var relation = graph.entity(relationId);
-
-               // There are some special rules for Public Transport v2 routes.
-               var isPTv2 = /stop|platform/.test(member.role);
-
-               if ((isNaN(memberIndex) || insertPair) && member.type === 'way' && !isPTv2) {
-                   // Try to perform sensible inserts based on how the ways join together
-                   graph = addWayMember(relation, graph);
-               } else {
-                   // see https://wiki.openstreetmap.org/wiki/Public_transport#Service_routes
-                   // Stops and Platforms for PTv2 should be ordered first.
-                   // hack: We do not currently have the ability to place them in the exactly correct order.
-                   if (isPTv2 && isNaN(memberIndex)) {
-                       memberIndex = 0;
-                   }
-
-                   graph = graph.replace(relation.addMember(member, memberIndex));
-               }
-
-               return graph;
-           };
-
-
-           // Add a way member into the relation "wherever it makes sense".
-           // In this situation we were not supplied a memberIndex.
-           function addWayMember(relation, graph) {
-               var groups, tempWay, item, i, j, k;
-
-               // remove PTv2 stops and platforms before doing anything.
-               var PTv2members = [];
-               var members = [];
-               for (i = 0; i < relation.members.length; i++) {
-                   var m = relation.members[i];
-                   if (/stop|platform/.test(m.role)) {
-                       PTv2members.push(m);
-                   } else {
-                       members.push(m);
-                   }
-               }
-               relation = relation.update({ members: members });
-
-
-               if (insertPair) {
-                   // We're adding a member that must stay paired with an existing member.
-                   // (This feature is used by `actionSplit`)
-                   //
-                   // This is tricky because the members may exist multiple times in the
-                   // member list, and with different A-B/B-A ordering and different roles.
-                   // (e.g. a bus route that loops out and back - #4589).
-                   //
-                   // Replace the existing member with a temporary way,
-                   // so that `osmJoinWays` can treat the pair like a single way.
-                   tempWay = osmWay({ id: 'wTemp', nodes: insertPair.nodes });
-                   graph = graph.replace(tempWay);
-                   var tempMember = { id: tempWay.id, type: 'way', role: member.role };
-                   var tempRelation = relation.replaceMember({id: insertPair.originalID}, tempMember, true);
-                   groups = utilArrayGroupBy(tempRelation.members, 'type');
-                   groups.way = groups.way || [];
-
-               } else {
-                   // Add the member anywhere, one time. Just push and let `osmJoinWays` decide where to put it.
-                   groups = utilArrayGroupBy(relation.members, 'type');
-                   groups.way = groups.way || [];
-                   groups.way.push(member);
-               }
-
-               members = withIndex(groups.way);
-               var joined = osmJoinWays(members, graph);
-
-               // `joined` might not contain all of the way members,
-               // But will contain only the completed (downloaded) members
-               for (i = 0; i < joined.length; i++) {
-                   var segment = joined[i];
-                   var nodes = segment.nodes.slice();
-                   var startIndex = segment[0].index;
-
-                   // j = array index in `members` where this segment starts
-                   for (j = 0; j < members.length; j++) {
-                       if (members[j].index === startIndex) {
-                           break;
-                       }
-                   }
-
-                   // k = each member in segment
-                   for (k = 0; k < segment.length; k++) {
-                       item = segment[k];
-                       var way = graph.entity(item.id);
-
-                       // If this is a paired item, generate members in correct order and role
-                       if (tempWay && item.id === tempWay.id) {
-                           if (nodes[0].id === insertPair.nodes[0]) {
-                               item.pair = [
-                                   { id: insertPair.originalID, type: 'way', role: item.role },
-                                   { id: insertPair.insertedID, type: 'way', role: item.role }
-                               ];
-                           } else {
-                               item.pair = [
-                                   { id: insertPair.insertedID, type: 'way', role: item.role },
-                                   { id: insertPair.originalID, type: 'way', role: item.role }
-                               ];
-                           }
-                       }
-
-                       // reorder `members` if necessary
-                       if (k > 0) {
-                           if (j+k >= members.length || item.index !== members[j+k].index) {
-                               moveMember(members, item.index, j+k);
-                           }
-                       }
-
-                       nodes.splice(0, way.nodes.length - 1);
-                   }
-               }
-
-               if (tempWay) {
-                   graph = graph.remove(tempWay);
-               }
-
-               // Final pass: skip dead items, split pairs, remove index properties
-               var wayMembers = [];
-               for (i = 0; i < members.length; i++) {
-                   item = members[i];
-                   if (item.index === -1) continue;
-
-                   if (item.pair) {
-                       wayMembers.push(item.pair[0]);
-                       wayMembers.push(item.pair[1]);
-                   } else {
-                       wayMembers.push(utilObjectOmit(item, ['index']));
-                   }
-               }
-
-               // Put stops and platforms first, then nodes, ways, relations
-               // This is recommended for Public Transport v2 routes:
-               // see https://wiki.openstreetmap.org/wiki/Public_transport#Service_routes
-               var newMembers = PTv2members.concat( (groups.node || []), wayMembers, (groups.relation || []) );
-
-               return graph.replace(relation.update({ members: newMembers }));
-
-
-               // `moveMember()` changes the `members` array in place by splicing
-               // the item with `.index = findIndex` to where it belongs,
-               // and marking the old position as "dead" with `.index = -1`
-               //
-               // j=5, k=0                jk
-               // segment                 5 4 7 6
-               // members       0 1 2 3 4 5 6 7 8 9        keep 5 in j+k
-               //
-               // j=5, k=1                j k
-               // segment                 5 4 7 6
-               // members       0 1 2 3 4 5 6 7 8 9        move 4 to j+k
-               // members       0 1 2 3 x 5 4 6 7 8 9      moved
-               //
-               // j=5, k=2                j   k
-               // segment                 5 4 7 6
-               // members       0 1 2 3 x 5 4 6 7 8 9      move 7 to j+k
-               // members       0 1 2 3 x 5 4 7 6 x 8 9    moved
-               //
-               // j=5, k=3                j     k
-               // segment                 5 4 7 6
-               // members       0 1 2 3 x 5 4 7 6 x 8 9    keep 6 in j+k
-               //
-               function moveMember(arr, findIndex, toIndex) {
-                   for (var i = 0; i < arr.length; i++) {
-                       if (arr[i].index === findIndex) {
-                           break;
-                       }
-                   }
-
-                   var item = Object.assign({}, arr[i]);   // shallow copy
-                   arr[i].index = -1;   // mark as dead
-                   item.index = toIndex;
-                   arr.splice(toIndex, 0, item);
-               }
-
-
-               // This is the same as `Relation.indexedMembers`,
-               // Except we don't want to index all the members, only the ways
-               function withIndex(arr) {
-                   var result = new Array(arr.length);
-                   for (var i = 0; i < arr.length; i++) {
-                       result[i] = Object.assign({}, arr[i]);   // shallow copy
-                       result[i].index = i;
-                   }
-                   return result;
-               }
-           }
-
-       }
-
-       function actionAddMidpoint(midpoint, node) {
-           return function(graph) {
-               graph = graph.replace(node.move(midpoint.loc));
-
-               var parents = utilArrayIntersection(
-                   graph.parentWays(graph.entity(midpoint.edge[0])),
-                   graph.parentWays(graph.entity(midpoint.edge[1]))
-               );
-
-               parents.forEach(function(way) {
-                   for (var i = 0; i < way.nodes.length - 1; i++) {
-                       if (geoEdgeEqual([way.nodes[i], way.nodes[i + 1]], midpoint.edge)) {
-                           graph = graph.replace(graph.entity(way.id).addNode(node.id, i + 1));
-
-                           // Add only one midpoint on doubled-back segments,
-                           // turning them into self-intersections.
-                           return;
-                       }
-                   }
-               });
-
-               return graph;
-           };
-       }
-
-       // https://github.com/openstreetmap/potlatch2/blob/master/net/systemeD/halcyon/connection/actions/AddNodeToWayAction.as
-       function actionAddVertex(wayId, nodeId, index) {
-           return function(graph) {
-               return graph.replace(graph.entity(wayId).addNode(nodeId, index));
-           };
-       }
-
-       function actionChangeMember(relationId, member, memberIndex) {
-           return function(graph) {
-               return graph.replace(graph.entity(relationId).updateMember(member, memberIndex));
-           };
-       }
-
-       function actionChangePreset(entityID, oldPreset, newPreset, skipFieldDefaults) {
-           return function action(graph) {
-               var entity = graph.entity(entityID);
-               var geometry = entity.geometry(graph);
-               var tags = entity.tags;
-
-               if (oldPreset) tags = oldPreset.unsetTags(tags, geometry);
-               if (newPreset) tags = newPreset.setTags(tags, geometry, skipFieldDefaults);
-
-               return graph.replace(entity.update({tags: tags}));
-           };
-       }
-
-       function actionChangeTags(entityId, tags) {
-           return function(graph) {
-               var entity = graph.entity(entityId);
-               return graph.replace(entity.update({tags: tags}));
-           };
-       }
-
-       function osmNode() {
-           if (!(this instanceof osmNode)) {
-               return (new osmNode()).initialize(arguments);
-           } else if (arguments.length) {
-               this.initialize(arguments);
-           }
-       }
-
-       osmEntity.node = osmNode;
-
-       osmNode.prototype = Object.create(osmEntity.prototype);
-
-       Object.assign(osmNode.prototype, {
-           type: 'node',
-           loc: [9999, 9999],
-
-           extent: function() {
-               return new geoExtent(this.loc);
-           },
-
-
-           geometry: function(graph) {
-               return graph.transient(this, 'geometry', function() {
-                   return graph.isPoi(this) ? 'point' : 'vertex';
-               });
-           },
-
-
-           move: function(loc) {
-               return this.update({loc: loc});
-           },
-
-
-           isDegenerate: function() {
-               return !(
-                   Array.isArray(this.loc) && this.loc.length === 2 &&
-                   this.loc[0] >= -180 && this.loc[0] <= 180 &&
-                   this.loc[1] >= -90 && this.loc[1] <= 90
-               );
-           },
-
-
-           // Inspect tags and geometry to determine which direction(s) this node/vertex points
-           directions: function(resolver, projection) {
-               var val;
-               var i;
-
-               // which tag to use?
-               if (this.isHighwayIntersection(resolver) && (this.tags.stop || '').toLowerCase() === 'all') {
-                   // all-way stop tag on a highway intersection
-                   val = 'all';
-               } else {
-                   // generic direction tag
-                   val = (this.tags.direction || '').toLowerCase();
-
-                   // better suffix-style direction tag
-                   var re = /:direction$/i;
-                   var keys = Object.keys(this.tags);
-                   for (i = 0; i < keys.length; i++) {
-                       if (re.test(keys[i])) {
-                           val = this.tags[keys[i]].toLowerCase();
-                           break;
-                       }
-                   }
-               }
-
-               if (val === '') return [];
-
-               var cardinal = {
-                   north: 0,               n: 0,
-                   northnortheast: 22,     nne: 22,
-                   northeast: 45,          ne: 45,
-                   eastnortheast: 67,      ene: 67,
-                   east: 90,               e: 90,
-                   eastsoutheast: 112,     ese: 112,
-                   southeast: 135,         se: 135,
-                   southsoutheast: 157,    sse: 157,
-                   south: 180,             s: 180,
-                   southsouthwest: 202,    ssw: 202,
-                   southwest: 225,         sw: 225,
-                   westsouthwest: 247,     wsw: 247,
-                   west: 270,              w: 270,
-                   westnorthwest: 292,     wnw: 292,
-                   northwest: 315,         nw: 315,
-                   northnorthwest: 337,    nnw: 337
-               };
-
-
-               var values = val.split(';');
-               var results = [];
-
-               values.forEach(function(v) {
-                   // swap cardinal for numeric directions
-                   if (cardinal[v] !== undefined) {
-                       v = cardinal[v];
-                   }
-
-                   // numeric direction - just add to results
-                   if (v !== '' && !isNaN(+v)) {
-                       results.push(+v);
-                       return;
-                   }
-
-                   // string direction - inspect parent ways
-                   var lookBackward =
-                       (this.tags['traffic_sign:backward'] || v === 'backward' || v === 'both' || v === 'all');
-                   var lookForward =
-                       (this.tags['traffic_sign:forward'] || v === 'forward' || v === 'both' || v === 'all');
-
-                   if (!lookForward && !lookBackward) return;
-
-                   var nodeIds = {};
-                   resolver.parentWays(this).forEach(function(parent) {
-                       var nodes = parent.nodes;
-                       for (i = 0; i < nodes.length; i++) {
-                           if (nodes[i] === this.id) {  // match current entity
-                               if (lookForward && i > 0) {
-                                   nodeIds[nodes[i - 1]] = true;  // look back to prev node
-                               }
-                               if (lookBackward && i < nodes.length - 1) {
-                                   nodeIds[nodes[i + 1]] = true;  // look ahead to next node
-                               }
-                           }
-                       }
-                   }, this);
-
-                   Object.keys(nodeIds).forEach(function(nodeId) {
-                       // +90 because geoAngle returns angle from X axis, not Y (north)
-                       results.push(
-                           (geoAngle(this, resolver.entity(nodeId), projection) * (180 / Math.PI)) + 90
-                       );
-                   }, this);
-
-               }, this);
-
-               return utilArrayUniq(results);
-           },
-
-
-           isEndpoint: function(resolver) {
-               return resolver.transient(this, 'isEndpoint', function() {
-                   var id = this.id;
-                   return resolver.parentWays(this).filter(function(parent) {
-                       return !parent.isClosed() && !!parent.affix(id);
-                   }).length > 0;
-               });
-           },
-
-
-           isConnected: function(resolver) {
-               return resolver.transient(this, 'isConnected', function() {
-                   var parents = resolver.parentWays(this);
-
-                   if (parents.length > 1) {
-                       // vertex is connected to multiple parent ways
-                       for (var i in parents) {
-                           if (parents[i].geometry(resolver) === 'line' &&
-                               parents[i].hasInterestingTags()) return true;
-                       }
-                   } else if (parents.length === 1) {
-                       var way = parents[0];
-                       var nodes = way.nodes.slice();
-                       if (way.isClosed()) { nodes.pop(); }  // ignore connecting node if closed
-
-                       // return true if vertex appears multiple times (way is self intersecting)
-                       return nodes.indexOf(this.id) !== nodes.lastIndexOf(this.id);
-                   }
-
-                   return false;
-               });
-           },
-
-
-           parentIntersectionWays: function(resolver) {
-               return resolver.transient(this, 'parentIntersectionWays', function() {
-                   return resolver.parentWays(this).filter(function(parent) {
-                       return (parent.tags.highway ||
-                           parent.tags.waterway ||
-                           parent.tags.railway ||
-                           parent.tags.aeroway) &&
-                           parent.geometry(resolver) === 'line';
-                   });
-               });
-           },
-
-
-           isIntersection: function(resolver) {
-               return this.parentIntersectionWays(resolver).length > 1;
-           },
-
-
-           isHighwayIntersection: function(resolver) {
-               return resolver.transient(this, 'isHighwayIntersection', function() {
-                   return resolver.parentWays(this).filter(function(parent) {
-                       return parent.tags.highway && parent.geometry(resolver) === 'line';
-                   }).length > 1;
-               });
-           },
-
-
-           isOnAddressLine: function(resolver) {
-               return resolver.transient(this, 'isOnAddressLine', function() {
-                   return resolver.parentWays(this).filter(function(parent) {
-                       return parent.tags.hasOwnProperty('addr:interpolation') &&
-                           parent.geometry(resolver) === 'line';
-                   }).length > 0;
-               });
-           },
-
-
-           asJXON: function(changeset_id) {
-               var r = {
-                   node: {
-                       '@id': this.osmId(),
-                       '@lon': this.loc[0],
-                       '@lat': this.loc[1],
-                       '@version': (this.version || 0),
-                       tag: Object.keys(this.tags).map(function(k) {
-                           return { keyAttributes: { k: k, v: this.tags[k] } };
-                       }, this)
-                   }
-               };
-               if (changeset_id) r.node['@changeset'] = changeset_id;
-               return r;
-           },
-
-
-           asGeoJSON: function() {
-               return {
-                   type: 'Point',
-                   coordinates: this.loc
-               };
-           }
-       });
-
-       function actionCircularize(wayId, projection, maxAngle) {
-           maxAngle = (maxAngle || 20) * Math.PI / 180;
-
-
-           var action = function(graph, t) {
-               if (t === null || !isFinite(t)) t = 1;
-               t = Math.min(Math.max(+t, 0), 1);
-
-               var way = graph.entity(wayId);
-               var origNodes = {};
-
-               graph.childNodes(way).forEach(function(node) {
-                   if (!origNodes[node.id]) origNodes[node.id] = node;
-               });
-
-               if (!way.isConvex(graph)) {
-                   graph = action.makeConvex(graph);
-               }
-
-               var nodes = utilArrayUniq(graph.childNodes(way));
-               var keyNodes = nodes.filter(function(n) { return graph.parentWays(n).length !== 1; });
-               var points = nodes.map(function(n) { return projection(n.loc); });
-               var keyPoints = keyNodes.map(function(n) { return projection(n.loc); });
-               var centroid = (points.length === 2) ? geoVecInterp(points[0], points[1], 0.5) : d3_polygonCentroid(points);
-               var radius = d3_median(points, function(p) { return geoVecLength(centroid, p); });
-               var sign = d3_polygonArea(points) > 0 ? 1 : -1;
-               var ids, i, j, k;
-
-               // we need atleast two key nodes for the algorithm to work
-               if (!keyNodes.length) {
-                   keyNodes = [nodes[0]];
-                   keyPoints = [points[0]];
-               }
-
-               if (keyNodes.length === 1) {
-                   var index = nodes.indexOf(keyNodes[0]);
-                   var oppositeIndex = Math.floor((index + nodes.length / 2) % nodes.length);
-
-                   keyNodes.push(nodes[oppositeIndex]);
-                   keyPoints.push(points[oppositeIndex]);
-               }
-
-               // key points and nodes are those connected to the ways,
-               // they are projected onto the circle, inbetween nodes are moved
-               // to constant intervals between key nodes, extra inbetween nodes are
-               // added if necessary.
-               for (i = 0; i < keyPoints.length; i++) {
-                   var nextKeyNodeIndex = (i + 1) % keyNodes.length;
-                   var startNode = keyNodes[i];
-                   var endNode = keyNodes[nextKeyNodeIndex];
-                   var startNodeIndex = nodes.indexOf(startNode);
-                   var endNodeIndex = nodes.indexOf(endNode);
-                   var numberNewPoints = -1;
-                   var indexRange = endNodeIndex - startNodeIndex;
-                   var nearNodes = {};
-                   var inBetweenNodes = [];
-                   var startAngle, endAngle, totalAngle, eachAngle;
-                   var angle, loc, node, origNode;
-
-                   if (indexRange < 0) {
-                       indexRange += nodes.length;
-                   }
-
-                   // position this key node
-                   var distance = geoVecLength(centroid, keyPoints[i]) || 1e-4;
-                   keyPoints[i] = [
-                       centroid[0] + (keyPoints[i][0] - centroid[0]) / distance * radius,
-                       centroid[1] + (keyPoints[i][1] - centroid[1]) / distance * radius
-                   ];
-                   loc = projection.invert(keyPoints[i]);
-                   node = keyNodes[i];
-                   origNode = origNodes[node.id];
-                   node = node.move(geoVecInterp(origNode.loc, loc, t));
-                   graph = graph.replace(node);
-
-                   // figure out the between delta angle we want to match to
-                   startAngle = Math.atan2(keyPoints[i][1] - centroid[1], keyPoints[i][0] - centroid[0]);
-                   endAngle = Math.atan2(keyPoints[nextKeyNodeIndex][1] - centroid[1], keyPoints[nextKeyNodeIndex][0] - centroid[0]);
-                   totalAngle = endAngle - startAngle;
-
-                   // detects looping around -pi/pi
-                   if (totalAngle * sign > 0) {
-                       totalAngle = -sign * (2 * Math.PI - Math.abs(totalAngle));
-                   }
-
-                   do {
-                       numberNewPoints++;
-                       eachAngle = totalAngle / (indexRange + numberNewPoints);
-                   } while (Math.abs(eachAngle) > maxAngle);
-
-
-                   // move existing nodes
-                   for (j = 1; j < indexRange; j++) {
-                       angle = startAngle + j * eachAngle;
-                       loc = projection.invert([
-                           centroid[0] + Math.cos(angle) * radius,
-                           centroid[1] + Math.sin(angle) * radius
-                       ]);
-
-                       node = nodes[(j + startNodeIndex) % nodes.length];
-                       origNode = origNodes[node.id];
-                       nearNodes[node.id] = angle;
-
-                       node = node.move(geoVecInterp(origNode.loc, loc, t));
-                       graph = graph.replace(node);
-                   }
-
-                   // add new inbetween nodes if necessary
-                   for (j = 0; j < numberNewPoints; j++) {
-                       angle = startAngle + (indexRange + j) * eachAngle;
-                       loc = projection.invert([
-                           centroid[0] + Math.cos(angle) * radius,
-                           centroid[1] + Math.sin(angle) * radius
-                       ]);
-
-                       // choose a nearnode to use as the original
-                       var min = Infinity;
-                       for (var nodeId in nearNodes) {
-                           var nearAngle = nearNodes[nodeId];
-                           var dist = Math.abs(nearAngle - angle);
-                           if (dist < min) {
-                               dist = min;
-                               origNode = origNodes[nodeId];
-                           }
-                       }
-
-                       node = osmNode({ loc: geoVecInterp(origNode.loc, loc, t) });
-                       graph = graph.replace(node);
-
-                       nodes.splice(endNodeIndex + j, 0, node);
-                       inBetweenNodes.push(node.id);
-                   }
-
-                   // Check for other ways that share these keyNodes..
-                   // If keyNodes are adjacent in both ways,
-                   // we can add inBetween nodes to that shared way too..
-                   if (indexRange === 1 && inBetweenNodes.length) {
-                       var startIndex1 = way.nodes.lastIndexOf(startNode.id);
-                       var endIndex1 = way.nodes.lastIndexOf(endNode.id);
-                       var wayDirection1 = (endIndex1 - startIndex1);
-                       if (wayDirection1 < -1) { wayDirection1 = 1; }
-
-                       var parentWays = graph.parentWays(keyNodes[i]);
-                       for (j = 0; j < parentWays.length; j++) {
-                           var sharedWay = parentWays[j];
-                           if (sharedWay === way) continue;
-
-                           if (sharedWay.areAdjacent(startNode.id, endNode.id)) {
-                               var startIndex2 = sharedWay.nodes.lastIndexOf(startNode.id);
-                               var endIndex2 = sharedWay.nodes.lastIndexOf(endNode.id);
-                               var wayDirection2 = (endIndex2 - startIndex2);
-                               var insertAt = endIndex2;
-                               if (wayDirection2 < -1) { wayDirection2 = 1; }
-
-                               if (wayDirection1 !== wayDirection2) {
-                                   inBetweenNodes.reverse();
-                                   insertAt = startIndex2;
-                               }
-                               for (k = 0; k < inBetweenNodes.length; k++) {
-                                   sharedWay = sharedWay.addNode(inBetweenNodes[k], insertAt + k);
-                               }
-                               graph = graph.replace(sharedWay);
-                           }
-                       }
-                   }
-
-               }
-
-               // update the way to have all the new nodes
-               ids = nodes.map(function(n) { return n.id; });
-               ids.push(ids[0]);
-
-               way = way.update({nodes: ids});
-               graph = graph.replace(way);
-
-               return graph;
-           };
-
-
-           action.makeConvex = function(graph) {
-               var way = graph.entity(wayId);
-               var nodes = utilArrayUniq(graph.childNodes(way));
-               var points = nodes.map(function(n) { return projection(n.loc); });
-               var sign = d3_polygonArea(points) > 0 ? 1 : -1;
-               var hull = d3_polygonHull(points);
-               var i, j;
-
-               // D3 convex hulls go counterclockwise..
-               if (sign === -1) {
-                   nodes.reverse();
-                   points.reverse();
-               }
-
-               for (i = 0; i < hull.length - 1; i++) {
-                   var startIndex = points.indexOf(hull[i]);
-                   var endIndex = points.indexOf(hull[i+1]);
-                   var indexRange = (endIndex - startIndex);
-
-                   if (indexRange < 0) {
-                       indexRange += nodes.length;
-                   }
-
-                   // move interior nodes to the surface of the convex hull..
-                   for (j = 1; j < indexRange; j++) {
-                       var point = geoVecInterp(hull[i], hull[i+1], j / indexRange);
-                       var node = nodes[(j + startIndex) % nodes.length].move(projection.invert(point));
-                       graph = graph.replace(node);
-                   }
-               }
-               return graph;
-           };
-
-
-           action.disabled = function(graph) {
-               if (!graph.entity(wayId).isClosed()) {
-                   return 'not_closed';
-               }
-
-               //disable when already circular
-               var way = graph.entity(wayId);
-               var nodes = utilArrayUniq(graph.childNodes(way));
-               var points = nodes.map(function(n) { return projection(n.loc); });
-               var hull = d3_polygonHull(points);
-               var epsilonAngle =  Math.PI / 180;
-               if (hull.length !== points.length || hull.length < 3){
-                   return false;
-               }
-               var centroid = d3_polygonCentroid(points);
-               var radius = geoVecLengthSquare(centroid, points[0]);
-
-               // compare distances between centroid and points
-               for (var i = 0; i<hull.length; i++){
-                   var actualPoint = hull[i];
-                   var actualDist = geoVecLengthSquare(actualPoint, centroid);
-                   var diff = Math.abs(actualDist - radius);
-                   //compare distances with epsilon-error (5%)
-                   if (diff > 0.05*radius) {
-                       return false;
-                   }
-               }
-               
-               //check if central angles are smaller than maxAngle
-               for (i = 0; i<hull.length; i++){
-                   actualPoint = hull[i];
-                   var nextPoint = hull[(i+1)%hull.length];
-                   var startAngle = Math.atan2(actualPoint[1] - centroid[1], actualPoint[0] - centroid[0]);
-                   var endAngle = Math.atan2(nextPoint[1] - centroid[1], nextPoint[0] - centroid[0]);
-                   var angle = endAngle - startAngle;
-                   if (angle < 0) {
-                       angle = -angle;
-                   }
-                   if (angle > Math.PI){
-                       angle = (2*Math.PI - angle);
-                   }
-        
-                   if (angle > maxAngle + epsilonAngle) {
-                       return false;
-                   }
-               }
-               return 'already_circular';
-           };
-
-
-           action.transitionable = true;
-
-
-           return action;
-       }
-
-       // https://github.com/openstreetmap/potlatch2/blob/master/net/systemeD/halcyon/connection/actions/DeleteWayAction.as
-       function actionDeleteWay(wayID) {
-
-           function canDeleteNode(node, graph) {
-               // don't delete nodes still attached to ways or relations
-               if (graph.parentWays(node).length ||
-                   graph.parentRelations(node).length) return false;
-
-               var geometries = osmNodeGeometriesForTags(node.tags);
-               // don't delete if this node can be a standalone point
-               if (geometries.point) return false;
-               // delete if this node only be a vertex
-               if (geometries.vertex) return true;
-
-               // iD doesn't know if this should be a point or vertex,
-               // so only delete if there are no interesting tags
-               return !node.hasInterestingTags();
-           }
-
-
-           var action = function(graph) {
-               var way = graph.entity(wayID);
-
-               graph.parentRelations(way).forEach(function(parent) {
-                   parent = parent.removeMembersWithID(wayID);
-                   graph = graph.replace(parent);
-
-                   if (parent.isDegenerate()) {
-                       graph = actionDeleteRelation(parent.id)(graph);
-                   }
-               });
-
-               (new Set(way.nodes)).forEach(function(nodeID) {
-                   graph = graph.replace(way.removeNode(nodeID));
-
-                   var node = graph.entity(nodeID);
-                   if (canDeleteNode(node, graph)) {
-                       graph = graph.remove(node);
-                   }
-               });
-
-               return graph.remove(way);
-           };
-
-
-           return action;
-       }
-
-       function actionDeleteMultiple(ids) {
-           var actions = {
-               way: actionDeleteWay,
-               node: actionDeleteNode,
-               relation: actionDeleteRelation
-           };
-
-
-           var action = function(graph) {
-               ids.forEach(function(id) {
-                   if (graph.hasEntity(id)) { // It may have been deleted aready.
-                       graph = actions[graph.entity(id).type](id)(graph);
-                   }
-               });
-
-               return graph;
-           };
-
-
-           return action;
-       }
-
-       // https://github.com/openstreetmap/potlatch2/blob/master/net/systemeD/halcyon/connection/actions/DeleteRelationAction.as
-       function actionDeleteRelation(relationID, allowUntaggedMembers) {
-
-           function canDeleteEntity(entity, graph) {
-               return !graph.parentWays(entity).length &&
-                   !graph.parentRelations(entity).length &&
-                   (!entity.hasInterestingTags() && !allowUntaggedMembers);
-           }
-
-
-           var action = function(graph) {
-               var relation = graph.entity(relationID);
-
-               graph.parentRelations(relation)
-                   .forEach(function(parent) {
-                       parent = parent.removeMembersWithID(relationID);
-                       graph = graph.replace(parent);
-
-                       if (parent.isDegenerate()) {
-                           graph = actionDeleteRelation(parent.id)(graph);
-                       }
-                   });
-
-               var memberIDs = utilArrayUniq(relation.members.map(function(m) { return m.id; }));
-               memberIDs.forEach(function(memberID) {
-                   graph = graph.replace(relation.removeMembersWithID(memberID));
-
-                   var entity = graph.entity(memberID);
-                   if (canDeleteEntity(entity, graph)) {
-                       graph = actionDeleteMultiple([memberID])(graph);
-                   }
-               });
-
-               return graph.remove(relation);
-           };
-
-
-           return action;
-       }
-
-       // https://github.com/openstreetmap/potlatch2/blob/master/net/systemeD/halcyon/connection/actions/DeleteNodeAction.as
-       function actionDeleteNode(nodeId) {
-           var action = function(graph) {
-               var node = graph.entity(nodeId);
-
-               graph.parentWays(node)
-                   .forEach(function(parent) {
-                       parent = parent.removeNode(nodeId);
-                       graph = graph.replace(parent);
-
-                       if (parent.isDegenerate()) {
-                           graph = actionDeleteWay(parent.id)(graph);
-                       }
-                   });
-
-               graph.parentRelations(node)
-                   .forEach(function(parent) {
-                       parent = parent.removeMembersWithID(nodeId);
-                       graph = graph.replace(parent);
-
-                       if (parent.isDegenerate()) {
-                           graph = actionDeleteRelation(parent.id)(graph);
-                       }
-                   });
-
-               return graph.remove(node);
-           };
-
-
-           return action;
-       }
-
-       // Connect the ways at the given nodes.
-       //
-       // First choose a node to be the survivor, with preference given
-       // to an existing (not new) node.
-       //
-       // Tags and relation memberships of of non-surviving nodes are merged
-       // to the survivor.
-       //
-       // This is the inverse of `iD.actionDisconnect`.
-       //
-       // Reference:
-       //   https://github.com/openstreetmap/potlatch2/blob/master/net/systemeD/halcyon/connection/actions/MergeNodesAction.as
-       //   https://github.com/openstreetmap/josm/blob/mirror/src/org/openstreetmap/josm/actions/MergeNodesAction.java
-       //
-       function actionConnect(nodeIDs) {
-           var action = function(graph) {
-               var survivor;
-               var node;
-               var parents;
-               var i, j;
-
-               // Choose a survivor node, prefer an existing (not new) node - #4974
-               for (i = 0; i < nodeIDs.length; i++) {
-                   survivor = graph.entity(nodeIDs[i]);
-                   if (survivor.version) break;  // found one
-               }
-
-               // Replace all non-surviving nodes with the survivor and merge tags.
-               for (i = 0; i < nodeIDs.length; i++) {
-                   node = graph.entity(nodeIDs[i]);
-                   if (node.id === survivor.id) continue;
-
-                   parents = graph.parentWays(node);
-                   for (j = 0; j < parents.length; j++) {
-                       graph = graph.replace(parents[j].replaceNode(node.id, survivor.id));
-                   }
-
-                   parents = graph.parentRelations(node);
-                   for (j = 0; j < parents.length; j++) {
-                       graph = graph.replace(parents[j].replaceMember(node, survivor));
-                   }
-
-                   survivor = survivor.mergeTags(node.tags);
-                   graph = actionDeleteNode(node.id)(graph);
-               }
-
-               graph = graph.replace(survivor);
-
-               // find and delete any degenerate ways created by connecting adjacent vertices
-               parents = graph.parentWays(survivor);
-               for (i = 0; i < parents.length; i++) {
-                   if (parents[i].isDegenerate()) {
-                       graph = actionDeleteWay(parents[i].id)(graph);
-                   }
-               }
-
-               return graph;
-           };
-
-
-           action.disabled = function(graph) {
-               var seen = {};
-               var restrictionIDs = [];
-               var survivor;
-               var node, way;
-               var relations, relation, role;
-               var i, j, k;
-
-               // Choose a survivor node, prefer an existing (not new) node - #4974
-               for (i = 0; i < nodeIDs.length; i++) {
-                   survivor = graph.entity(nodeIDs[i]);
-                   if (survivor.version) break;  // found one
-               }
-
-               // 1. disable if the nodes being connected have conflicting relation roles
-               for (i = 0; i < nodeIDs.length; i++) {
-                   node = graph.entity(nodeIDs[i]);
-                   relations = graph.parentRelations(node);
-
-                   for (j = 0; j < relations.length; j++) {
-                       relation = relations[j];
-                       role = relation.memberById(node.id).role || '';
-
-                       // if this node is a via node in a restriction, remember for later
-                       if (relation.hasFromViaTo()) {
-                           restrictionIDs.push(relation.id);
-                       }
-
-                       if (seen[relation.id] !== undefined && seen[relation.id] !== role) {
-                           return 'relation';
-                       } else {
-                           seen[relation.id] = role;
-                       }
-                   }
-               }
-
-               // gather restrictions for parent ways
-               for (i = 0; i < nodeIDs.length; i++) {
-                   node = graph.entity(nodeIDs[i]);
-
-                   var parents = graph.parentWays(node);
-                   for (j = 0; j < parents.length; j++) {
-                       var parent = parents[j];
-                       relations = graph.parentRelations(parent);
-
-                       for (k = 0; k < relations.length; k++) {
-                           relation = relations[k];
-                           if (relation.hasFromViaTo()) {
-                               restrictionIDs.push(relation.id);
-                           }
-                       }
-                   }
-               }
-
-
-               // test restrictions
-               restrictionIDs = utilArrayUniq(restrictionIDs);
-               for (i = 0; i < restrictionIDs.length; i++) {
-                   relation = graph.entity(restrictionIDs[i]);
-                   if (!relation.isComplete(graph)) continue;
-
-                   var memberWays = relation.members
-                       .filter(function(m) { return m.type === 'way'; })
-                       .map(function(m) { return graph.entity(m.id); });
-
-                   memberWays = utilArrayUniq(memberWays);
-                   var f = relation.memberByRole('from');
-                   var t = relation.memberByRole('to');
-                   var isUturn = (f.id === t.id);
-
-                   // 2a. disable if connection would damage a restriction
-                   // (a key node is a node at the junction of ways)
-                   var nodes = { from: [], via: [], to: [], keyfrom: [], keyto: [] };
-                   for (j = 0; j < relation.members.length; j++) {
-                       collectNodes(relation.members[j], nodes);
-                   }
-
-                   nodes.keyfrom = utilArrayUniq(nodes.keyfrom.filter(hasDuplicates));
-                   nodes.keyto = utilArrayUniq(nodes.keyto.filter(hasDuplicates));
-
-                   var filter = keyNodeFilter(nodes.keyfrom, nodes.keyto);
-                   nodes.from = nodes.from.filter(filter);
-                   nodes.via = nodes.via.filter(filter);
-                   nodes.to = nodes.to.filter(filter);
-
-                   var connectFrom = false;
-                   var connectVia = false;
-                   var connectTo = false;
-                   var connectKeyFrom = false;
-                   var connectKeyTo = false;
-
-                   for (j = 0; j < nodeIDs.length; j++) {
-                       var n = nodeIDs[j];
-                       if (nodes.from.indexOf(n) !== -1)    { connectFrom = true; }
-                       if (nodes.via.indexOf(n) !== -1)     { connectVia = true; }
-                       if (nodes.to.indexOf(n) !== -1)      { connectTo = true; }
-                       if (nodes.keyfrom.indexOf(n) !== -1) { connectKeyFrom = true; }
-                       if (nodes.keyto.indexOf(n) !== -1)   { connectKeyTo = true; }
-                   }
-                   if (connectFrom && connectTo && !isUturn) { return 'restriction'; }
-                   if (connectFrom && connectVia) { return 'restriction'; }
-                   if (connectTo   && connectVia) { return 'restriction'; }
-
-                   // connecting to a key node -
-                   // if both nodes are on a member way (i.e. part of the turn restriction),
-                   // the connecting node must be adjacent to the key node.
-                   if (connectKeyFrom || connectKeyTo) {
-                       if (nodeIDs.length !== 2) { return 'restriction'; }
-
-                       var n0 = null;
-                       var n1 = null;
-                       for (j = 0; j < memberWays.length; j++) {
-                           way = memberWays[j];
-                           if (way.contains(nodeIDs[0])) { n0 = nodeIDs[0]; }
-                           if (way.contains(nodeIDs[1])) { n1 = nodeIDs[1]; }
-                       }
-
-                       if (n0 && n1) {    // both nodes are part of the restriction
-                           var ok = false;
-                           for (j = 0; j < memberWays.length; j++) {
-                               way = memberWays[j];
-                               if (way.areAdjacent(n0, n1)) {
-                                   ok = true;
-                                   break;
-                               }
-                           }
-                           if (!ok) {
-                               return 'restriction';
-                           }
-                       }
-                   }
-
-                   // 2b. disable if nodes being connected will destroy a member way in a restriction
-                   // (to test, make a copy and try actually connecting the nodes)
-                   for (j = 0; j < memberWays.length; j++) {
-                       way = memberWays[j].update({});   // make copy
-                       for (k = 0; k < nodeIDs.length; k++) {
-                           if (nodeIDs[k] === survivor.id) continue;
-
-                           if (way.areAdjacent(nodeIDs[k], survivor.id)) {
-                               way = way.removeNode(nodeIDs[k]);
-                           } else {
-                               way = way.replaceNode(nodeIDs[k], survivor.id);
-                           }
-                       }
-                       if (way.isDegenerate()) {
-                           return 'restriction';
-                       }
-                   }
-               }
-
-               return false;
-
-
-               // if a key node appears multiple times (indexOf !== lastIndexOf) it's a FROM-VIA or TO-VIA junction
-               function hasDuplicates(n, i, arr) {
-                   return arr.indexOf(n) !== arr.lastIndexOf(n);
-               }
-
-               function keyNodeFilter(froms, tos) {
-                   return function(n) {
-                       return froms.indexOf(n) === -1 && tos.indexOf(n) === -1;
-                   };
-               }
-
-               function collectNodes(member, collection) {
-                   var entity = graph.hasEntity(member.id);
-                   if (!entity) return;
-
-                   var role = member.role || '';
-                   if (!collection[role]) {
-                       collection[role] = [];
-                   }
-
-                   if (member.type === 'node') {
-                       collection[role].push(member.id);
-                       if (role === 'via') {
-                           collection.keyfrom.push(member.id);
-                           collection.keyto.push(member.id);
-                       }
-
-                   } else if (member.type === 'way') {
-                       collection[role].push.apply(collection[role], entity.nodes);
-                       if (role === 'from' || role === 'via') {
-                           collection.keyfrom.push(entity.first());
-                           collection.keyfrom.push(entity.last());
-                       }
-                       if (role === 'to' || role === 'via') {
-                           collection.keyto.push(entity.first());
-                           collection.keyto.push(entity.last());
-                       }
-                   }
-               }
-           };
-
-
-           return action;
-       }
-
-       function actionCopyEntities(ids, fromGraph) {
-           var _copies = {};
-
-
-           var action = function(graph) {
-               ids.forEach(function(id) {
-                   fromGraph.entity(id).copy(fromGraph, _copies);
-               });
-
-               for (var id in _copies) {
-                   graph = graph.replace(_copies[id]);
-               }
-
-               return graph;
-           };
-
-
-           action.copies = function() {
-               return _copies;
-           };
-
-
-           return action;
-       }
-
-       function actionDeleteMember(relationId, memberIndex) {
-           return function(graph) {
-               var relation = graph.entity(relationId)
-                   .removeMember(memberIndex);
-
-               graph = graph.replace(relation);
-
-               if (relation.isDegenerate())
-                   graph = actionDeleteRelation(relation.id)(graph);
-
-               return graph;
-           };
-       }
-
-       function actionDiscardTags(difference, discardTags) {
-         discardTags = discardTags || {};
-
-         return (graph) => {
-           difference.modified().forEach(checkTags);
-           difference.created().forEach(checkTags);
-           return graph;
-
-           function checkTags(entity) {
-             const keys = Object.keys(entity.tags);
-             let didDiscard = false;
-             let tags = {};
-
-             for (let i = 0; i < keys.length; i++) {
-               const k = keys[i];
-               if (discardTags[k] || !entity.tags[k]) {
-                 didDiscard = true;
-               } else {
-                 tags[k] = entity.tags[k];
-               }
-             }
-             if (didDiscard) {
-               graph = graph.replace(entity.update({ tags: tags }));
-             }
-           }
-
-         };
-       }
-
-       // Disconect the ways at the given node.
-       //
-       // Optionally, disconnect only the given ways.
-       //
-       // For testing convenience, accepts an ID to assign to the (first) new node.
-       // Normally, this will be undefined and the way will automatically
-       // be assigned a new ID.
-       //
-       // This is the inverse of `iD.actionConnect`.
-       //
-       // Reference:
-       //   https://github.com/openstreetmap/potlatch2/blob/master/net/systemeD/halcyon/connection/actions/UnjoinNodeAction.as
-       //   https://github.com/openstreetmap/josm/blob/mirror/src/org/openstreetmap/josm/actions/UnGlueAction.java
-       //
-       function actionDisconnect(nodeId, newNodeId) {
-           var wayIds;
-
-
-           var action = function(graph) {
-               var node = graph.entity(nodeId);
-               var connections = action.connections(graph);
-
-               connections.forEach(function(connection) {
-                   var way = graph.entity(connection.wayID);
-                   var newNode = osmNode({id: newNodeId, loc: node.loc, tags: node.tags});
-
-                   graph = graph.replace(newNode);
-                   if (connection.index === 0 && way.isArea()) {
-                       // replace shared node with shared node..
-                       graph = graph.replace(way.replaceNode(way.nodes[0], newNode.id));
-                   } else if (way.isClosed() && connection.index === way.nodes.length - 1) {
-                       // replace closing node with new new node..
-                       graph = graph.replace(way.unclose().addNode(newNode.id));
-                   } else {
-                       // replace shared node with multiple new nodes..
-                       graph = graph.replace(way.updateNode(newNode.id, connection.index));
-                   }
-               });
-
-               return graph;
-           };
-
-
-           action.connections = function(graph) {
-               var candidates = [];
-               var keeping = false;
-               var parentWays = graph.parentWays(graph.entity(nodeId));
-               var way, waynode;
-               for (var i = 0; i < parentWays.length; i++) {
-                   way = parentWays[i];
-                   if (wayIds && wayIds.indexOf(way.id) === -1) {
-                       keeping = true;
-                       continue;
-                   }
-                   if (way.isArea() && (way.nodes[0] === nodeId)) {
-                       candidates.push({ wayID: way.id, index: 0 });
-                   } else {
-                       for (var j = 0; j < way.nodes.length; j++) {
-                           waynode = way.nodes[j];
-                           if (waynode === nodeId) {
-                               if (way.isClosed() &&
-                                   parentWays.length > 1 &&
-                                   wayIds &&
-                                   wayIds.indexOf(way.id) !== -1 &&
-                                   j === way.nodes.length - 1) {
-                                   continue;
-                               }
-                               candidates.push({ wayID: way.id, index: j });
-                           }
-                       }
-                   }
-               }
-
-               return keeping ? candidates : candidates.slice(1);
-           };
-
-
-           action.disabled = function(graph) {
-               var connections = action.connections(graph);
-               if (connections.length === 0)
-                   return 'not_connected';
-
-               var parentWays = graph.parentWays(graph.entity(nodeId));
-               var seenRelationIds = {};
-               var sharedRelation;
-
-               parentWays.forEach(function(way) {
-                   var relations = graph.parentRelations(way);
-                   relations.forEach(function(relation) {
-                       if (relation.id in seenRelationIds) {
-                           if (wayIds) {
-                               if (wayIds.indexOf(way.id) !== -1 ||
-                                   wayIds.indexOf(seenRelationIds[relation.id]) !== -1) {
-                                   sharedRelation = relation;
-                               }
-                           } else {
-                               sharedRelation = relation;
-                           }
-                       } else {
-                           seenRelationIds[relation.id] = way.id;
-                       }
-                   });
-               });
-
-               if (sharedRelation)
-                   return 'relation';
-           };
-
-
-           action.limitWays = function(val) {
-               if (!arguments.length) return wayIds;
-               wayIds = val;
-               return action;
-           };
-
-
-           return action;
-       }
-
-       function actionExtract(entityID) {
-
-           var extractedNodeID;
-
-           var action = function(graph) {
-               var entity = graph.entity(entityID);
-
-               if (entity.type === 'node') {
-                   return extractFromNode(entity, graph);
-               }
-
-               return extractFromWayOrRelation(entity, graph);
-           };
-
-           function extractFromNode(node, graph) {
-
-               extractedNodeID = node.id;
-
-               // Create a new node to replace the one we will detach
-               var replacement = osmNode({ loc: node.loc });
-               graph = graph.replace(replacement);
-
-               // Process each way in turn, updating the graph as we go
-               graph = graph.parentWays(node)
-                   .reduce(function(accGraph, parentWay) {
-                       return accGraph.replace(parentWay.replaceNode(entityID, replacement.id));
-                   }, graph);
-
-               // Process any relations too
-               return graph.parentRelations(node)
-                   .reduce(function(accGraph, parentRel) {
-                       return accGraph.replace(parentRel.replaceMember(node, replacement));
-                   }, graph);
-           }
-
-           function extractFromWayOrRelation(entity, graph) {
-
-               var fromGeometry = entity.geometry(graph);
-
-               var keysToCopyAndRetain = ['source', 'wheelchair'];
-               var keysToRetain = ['area'];
-               var buildingKeysToRetain = ['architect', 'building', 'height', 'layer'];
-
-               var extractedLoc = d3_geoCentroid(entity.asGeoJSON(graph));
-               if (!extractedLoc  || !isFinite(extractedLoc[0]) || !isFinite(extractedLoc[1])) {
-                   extractedLoc = entity.extent(graph).center();
-               }
-
-               var isBuilding = entity.tags.building && entity.tags.building !== 'no';
-
-               var entityTags = Object.assign({}, entity.tags);  // shallow copy
-               var pointTags = {};
-               for (var key in entityTags) {
-
-                   if (entity.type === 'relation' &&
-                       key === 'type') {
-                       continue;
-                   }
-
-                   if (keysToRetain.indexOf(key) !== -1) {
-                       continue;
-                   }
-
-                   if (isBuilding) {
-                       // don't transfer building-related tags
-                       if (buildingKeysToRetain.indexOf(key) !== -1 ||
-                           key.match(/^building:.{1,}/) ||
-                           key.match(/^roof:.{1,}/)) continue;
-                   }
-
-                   // copy the tag from the entity to the point
-                   pointTags[key] = entityTags[key];
-
-                   // leave addresses and some other tags so they're on both features
-                   if (keysToCopyAndRetain.indexOf(key) !== -1 ||
-                       key.match(/^addr:.{1,}/)) {
-                       continue;
-                   }
-
-                   // remove the tag from the entity
-                   delete entityTags[key];
-               }
-
-               if (!isBuilding && fromGeometry === 'area') {
-                   // ensure that areas keep area geometry
-                   entityTags.area = 'yes';
-               }
-
-               var replacement = osmNode({ loc: extractedLoc, tags: pointTags });
-               graph = graph.replace(replacement);
-
-               extractedNodeID = replacement.id;
-
-               return graph.replace(entity.update({tags: entityTags}));
-           }
-
-           action.getExtractedNodeID = function() {
-               return extractedNodeID;
-           };
-
-           return action;
-       }
-
-       // Join ways at the end node they share.
-       //
-       // This is the inverse of `iD.actionSplit`.
-       //
-       // Reference:
-       //   https://github.com/systemed/potlatch2/blob/master/net/systemeD/halcyon/connection/actions/MergeWaysAction.as
-       //   https://github.com/openstreetmap/josm/blob/mirror/src/org/openstreetmap/josm/actions/CombineWayAction.java
-       //
-       function actionJoin(ids) {
-
-           function groupEntitiesByGeometry(graph) {
-               var entities = ids.map(function(id) { return graph.entity(id); });
-               return Object.assign(
-                   { line: [] },
-                   utilArrayGroupBy(entities, function(entity) { return entity.geometry(graph); })
-               );
-           }
-
-
-           var action = function(graph) {
-               var ways = ids.map(graph.entity, graph);
-               var survivorID = ways[0].id;
-
-               // if any of the ways are sided (e.g. coastline, cliff, kerb)
-               // sort them first so they establish the overall order - #6033
-               ways.sort(function(a, b) {
-                   var aSided = a.isSided();
-                   var bSided = b.isSided();
-                   return (aSided && !bSided) ? -1
-                       : (bSided && !aSided) ? 1
-                       : 0;
-               });
-
-               // Prefer to keep an existing way.
-               for (var i = 0; i < ways.length; i++) {
-                   if (!ways[i].isNew()) {
-                       survivorID = ways[i].id;
-                       break;
-                   }
-               }
-
-               var sequences = osmJoinWays(ways, graph);
-               var joined = sequences[0];
-
-               // We might need to reverse some of these ways before joining them.  #4688
-               // `joined.actions` property will contain any actions we need to apply.
-               graph = sequences.actions.reduce(function(g, action) { return action(g); }, graph);
-
-               var survivor = graph.entity(survivorID);
-               survivor = survivor.update({ nodes: joined.nodes.map(function(n) { return n.id; }) });
-               graph = graph.replace(survivor);
-
-               joined.forEach(function(way) {
-                   if (way.id === survivorID) return;
-
-                   graph.parentRelations(way).forEach(function(parent) {
-                       graph = graph.replace(parent.replaceMember(way, survivor));
-                   });
-
-                   survivor = survivor.mergeTags(way.tags);
-
-                   graph = graph.replace(survivor);
-                   graph = actionDeleteWay(way.id)(graph);
-               });
-
-               // Finds if the join created a single-member multipolygon,
-               // and if so turns it into a basic area instead
-               function checkForSimpleMultipolygon() {
-                   if (!survivor.isClosed()) return;
-
-                   var multipolygons = graph.parentMultipolygons(survivor).filter(function(multipolygon) {
-                       // find multipolygons where the survivor is the only member
-                       return multipolygon.members.length === 1;
-                   });
-
-                   // skip if this is the single member of multiple multipolygons
-                   if (multipolygons.length !== 1) return;
-
-                   var multipolygon = multipolygons[0];
-
-                   for (var key in survivor.tags) {
-                       if (multipolygon.tags[key] &&
-                           // don't collapse if tags cannot be cleanly merged
-                           multipolygon.tags[key] !== survivor.tags[key]) return;
-                   }
-
-                   survivor = survivor.mergeTags(multipolygon.tags);
-                   graph = graph.replace(survivor);
-                   graph = actionDeleteRelation(multipolygon.id, true /* allow untagged members */)(graph);
-
-                   var tags = Object.assign({}, survivor.tags);
-                   if (survivor.geometry(graph) !== 'area') {
-                       // ensure the feature persists as an area
-                       tags.area = 'yes';
-                   }
-                   delete tags.type; // remove type=multipolygon
-                   survivor = survivor.update({ tags: tags });
-                   graph = graph.replace(survivor);
-               }
-               checkForSimpleMultipolygon();
-
-               return graph;
-           };
-
-           // Returns the number of nodes the resultant way is expected to have
-           action.resultingWayNodesLength = function(graph) {
-               return ids.reduce(function(count, id) {
-                   return count + graph.entity(id).nodes.length;
-               }, 0) - ids.length - 1;
-           };
-
-
-           action.disabled = function(graph) {
-               var geometries = groupEntitiesByGeometry(graph);
-               if (ids.length < 2 || ids.length !== geometries.line.length) {
-                   return 'not_eligible';
-               }
-
-               var joined = osmJoinWays(ids.map(graph.entity, graph), graph);
-               if (joined.length > 1) {
-                   return 'not_adjacent';
-               }
-
-               // Loop through all combinations of path-pairs
-               // to check potential intersections between all pairs
-               for (var i = 0; i < ids.length - 1; i++) {
-                   for (var j = i + 1; j < ids.length; j++) {
-                       var path1 = graph.childNodes(graph.entity(ids[i]))
-                           .map(function(e) { return e.loc; });
-                       var path2 = graph.childNodes(graph.entity(ids[j]))
-                           .map(function(e) { return e.loc; });
-                       var intersections = geoPathIntersections(path1, path2);
-
-                       // Check if intersections are just nodes lying on top of
-                       // each other/the line, as opposed to crossing it
-                       var common = utilArrayIntersection(
-                           joined[0].nodes.map(function(n) { return n.loc.toString(); }),
-                           intersections.map(function(n) { return n.toString(); })
-                       );
-                       if (common.length !== intersections.length) {
-                           return 'paths_intersect';
-                       }
-                   }
-               }
-
-               var nodeIds = joined[0].nodes.map(function(n) { return n.id; }).slice(1, -1);
-               var relation;
-               var tags = {};
-               var conflicting = false;
-
-               joined[0].forEach(function(way) {
-                   var parents = graph.parentRelations(way);
-                   parents.forEach(function(parent) {
-                       if (parent.isRestriction() && parent.members.some(function(m) { return nodeIds.indexOf(m.id) >= 0; })) {
-                           relation = parent;
-                       }
-                   });
-
-                   for (var k in way.tags) {
-                       if (!(k in tags)) {
-                           tags[k] = way.tags[k];
-                       } else if (tags[k] && osmIsInterestingTag(k) && tags[k] !== way.tags[k]) {
-                           conflicting = true;
-                       }
-                   }
-               });
-
-               if (relation) {
-                   return 'restriction';
-               }
-
-               if (conflicting) {
-                   return 'conflicting_tags';
-               }
-           };
-
-
-           return action;
-       }
-
-       function actionMerge(ids) {
-
-           function groupEntitiesByGeometry(graph) {
-               var entities = ids.map(function(id) { return graph.entity(id); });
-               return Object.assign(
-                   { point: [], area: [], line: [], relation: [] },
-                   utilArrayGroupBy(entities, function(entity) { return entity.geometry(graph); })
-               );
-           }
-
-
-           var action = function(graph) {
-               var geometries = groupEntitiesByGeometry(graph);
-               var target = geometries.area[0] || geometries.line[0];
-               var points = geometries.point;
-
-               points.forEach(function(point) {
-                   target = target.mergeTags(point.tags);
-                   graph = graph.replace(target);
-
-                   graph.parentRelations(point).forEach(function(parent) {
-                       graph = graph.replace(parent.replaceMember(point, target));
-                   });
-
-                   var nodes = utilArrayUniq(graph.childNodes(target));
-                   var removeNode = point;
-
-                   for (var i = 0; i < nodes.length; i++) {
-                       var node = nodes[i];
-                       if (graph.parentWays(node).length > 1 ||
-                           graph.parentRelations(node).length ||
-                           node.hasInterestingTags()) {
-                           continue;
-                       }
-
-                       // Found an uninteresting child node on the target way.
-                       // Move orig point into its place to preserve point's history. #3683
-                       graph = graph.replace(point.update({ tags: {}, loc: node.loc }));
-                       target = target.replaceNode(node.id, point.id);
-                       graph = graph.replace(target);
-                       removeNode = node;
-                       break;
-                   }
-
-                   graph = graph.remove(removeNode);
-               });
-
-               if (target.tags.area === 'yes') {
-                   var tags = Object.assign({}, target.tags); // shallow copy
-                   delete tags.area;
-                   if (osmTagSuggestingArea(tags)) {
-                       // remove the `area` tag if area geometry is now implied - #3851
-                       target = target.update({ tags: tags });
-                       graph = graph.replace(target);
-                   }
-               }
-
-               return graph;
-           };
-
-
-           action.disabled = function(graph) {
-               var geometries = groupEntitiesByGeometry(graph);
-               if (geometries.point.length === 0 ||
-                   (geometries.area.length + geometries.line.length) !== 1 ||
-                   geometries.relation.length !== 0) {
-                   return 'not_eligible';
-               }
-           };
-
-
-           return action;
-       }
-
-       // `actionMergeNodes` is just a combination of:
-       //
-       // 1. move all the nodes to a common location
-       // 2. `actionConnect` them
-
-       function actionMergeNodes(nodeIDs, loc) {
-
-           // If there is a single "interesting" node, use that as the location.
-           // Otherwise return the average location of all the nodes.
-           function chooseLoc(graph) {
-               if (!nodeIDs.length) return null;
-               var sum = [0,0];
-               var interestingCount = 0;
-               var interestingLoc;
-
-               for (var i = 0; i < nodeIDs.length; i++) {
-                   var node = graph.entity(nodeIDs[i]);
-                   if (node.hasInterestingTags()) {
-                       interestingLoc = (++interestingCount === 1) ? node.loc : null;
-                   }
-                   sum = geoVecAdd(sum, node.loc);
-               }
-
-               return interestingLoc || geoVecScale(sum, 1 / nodeIDs.length);
-           }
-
-
-           var action = function(graph) {
-               if (nodeIDs.length < 2) return graph;
-               var toLoc = loc;
-               if (!toLoc) {
-                   toLoc = chooseLoc(graph);
-               }
-
-               for (var i = 0; i < nodeIDs.length; i++) {
-                   var node = graph.entity(nodeIDs[i]);
-                   if (node.loc !== toLoc) {
-                       graph = graph.replace(node.move(toLoc));
-                   }
-               }
-
-               return actionConnect(nodeIDs)(graph);
-           };
-
-
-           action.disabled = function(graph) {
-               if (nodeIDs.length < 2) return 'not_eligible';
-
-               for (var i = 0; i < nodeIDs.length; i++) {
-                   var entity = graph.entity(nodeIDs[i]);
-                   if (entity.type !== 'node') return 'not_eligible';
-               }
-
-               return actionConnect(nodeIDs).disabled(graph);
-           };
-
-           return action;
-       }
-
-       function osmChangeset() {
-           if (!(this instanceof osmChangeset)) {
-               return (new osmChangeset()).initialize(arguments);
-           } else if (arguments.length) {
-               this.initialize(arguments);
-           }
-       }
-
-
-       osmEntity.changeset = osmChangeset;
-
-       osmChangeset.prototype = Object.create(osmEntity.prototype);
-
-       Object.assign(osmChangeset.prototype, {
-
-           type: 'changeset',
-
-
-           extent: function() {
-               return new geoExtent();
-           },
-
-
-           geometry: function() {
-               return 'changeset';
-           },
-
-
-           asJXON: function() {
-               return {
-                   osm: {
-                       changeset: {
-                           tag: Object.keys(this.tags).map(function(k) {
-                               return { '@k': k, '@v': this.tags[k] };
-                           }, this),
-                           '@version': 0.6,
-                           '@generator': 'iD'
-                       }
-                   }
-               };
-           },
-
-
-           // Generate [osmChange](http://wiki.openstreetmap.org/wiki/OsmChange)
-           // XML. Returns a string.
-           osmChangeJXON: function(changes) {
-               var changeset_id = this.id;
-
-               function nest(x, order) {
-                   var groups = {};
-                   for (var i = 0; i < x.length; i++) {
-                       var tagName = Object.keys(x[i])[0];
-                       if (!groups[tagName]) groups[tagName] = [];
-                       groups[tagName].push(x[i][tagName]);
-                   }
-                   var ordered = {};
-                   order.forEach(function(o) {
-                       if (groups[o]) ordered[o] = groups[o];
-                   });
-                   return ordered;
-               }
-
-
-               // sort relations in a changeset by dependencies
-               function sort(changes) {
-
-                   // find a referenced relation in the current changeset
-                   function resolve(item) {
-                       return relations.find(function(relation) {
-                           return item.keyAttributes.type === 'relation'
-                               && item.keyAttributes.ref === relation['@id'];
-                       });
-                   }
-
-                   // a new item is an item that has not been already processed
-                   function isNew(item) {
-                       return !sorted[ item['@id'] ] && !processing.find(function(proc) {
-                           return proc['@id'] === item['@id'];
-                       });
-                   }
-
-                   var processing = [];
-                   var sorted = {};
-                   var relations = changes.relation;
-
-                   if (!relations) return changes;
-
-                   for (var i = 0; i < relations.length; i++) {
-                       var relation = relations[i];
-
-                       // skip relation if already sorted
-                       if (!sorted[relation['@id']]) {
-                           processing.push(relation);
-                       }
-
-                       while (processing.length > 0) {
-                           var next = processing[0],
-                           deps = next.member.map(resolve).filter(Boolean).filter(isNew);
-                           if (deps.length === 0) {
-                               sorted[next['@id']] = next;
-                               processing.shift();
-                           } else {
-                               processing = deps.concat(processing);
-                           }
-                       }
-                   }
-
-                   changes.relation = Object.values(sorted);
-                   return changes;
-               }
-
-               function rep(entity) {
-                   return entity.asJXON(changeset_id);
-               }
-
-               return {
-                   osmChange: {
-                       '@version': 0.6,
-                       '@generator': 'iD',
-                       'create': sort(nest(changes.created.map(rep), ['node', 'way', 'relation'])),
-                       'modify': nest(changes.modified.map(rep), ['node', 'way', 'relation']),
-                       'delete': Object.assign(nest(changes.deleted.map(rep), ['relation', 'way', 'node']), { '@if-unused': true })
-                   }
-               };
-           },
-
-
-           asGeoJSON: function() {
-               return {};
-           }
-
-       });
-
-       function osmNote() {
-           if (!(this instanceof osmNote)) {
-               return (new osmNote()).initialize(arguments);
-           } else if (arguments.length) {
-               this.initialize(arguments);
-           }
-       }
-
-
-       osmNote.id = function() {
-           return osmNote.id.next--;
-       };
-
-
-       osmNote.id.next = -1;
-
-
-       Object.assign(osmNote.prototype, {
-
-           type: 'note',
-
-           initialize: function(sources) {
-               for (var i = 0; i < sources.length; ++i) {
-                   var source = sources[i];
-                   for (var prop in source) {
-                       if (Object.prototype.hasOwnProperty.call(source, prop)) {
-                           if (source[prop] === undefined) {
-                               delete this[prop];
-                           } else {
-                               this[prop] = source[prop];
-                           }
-                       }
-                   }
-               }
-
-               if (!this.id) {
-                   this.id = osmNote.id() + '';  // as string
-               }
-
-               return this;
-           },
-
-           extent: function() {
-               return new geoExtent(this.loc);
-           },
-
-           update: function(attrs) {
-               return osmNote(this, attrs); // {v: 1 + (this.v || 0)}
-           },
-
-           isNew: function() {
-               return this.id < 0;
-           },
-
-           move: function(loc) {
-               return this.update({ loc: loc });
-           }
-
-       });
-
-       function osmRelation() {
-           if (!(this instanceof osmRelation)) {
-               return (new osmRelation()).initialize(arguments);
-           } else if (arguments.length) {
-               this.initialize(arguments);
-           }
-       }
-
-
-       osmEntity.relation = osmRelation;
-
-       osmRelation.prototype = Object.create(osmEntity.prototype);
-
-
-       osmRelation.creationOrder = function(a, b) {
-           var aId = parseInt(osmEntity.id.toOSM(a.id), 10);
-           var bId = parseInt(osmEntity.id.toOSM(b.id), 10);
-
-           if (aId < 0 || bId < 0) return aId - bId;
-           return bId - aId;
-       };
-
-
-       Object.assign(osmRelation.prototype, {
-           type: 'relation',
-           members: [],
-
-
-           copy: function(resolver, copies) {
-               if (copies[this.id]) return copies[this.id];
-
-               var copy = osmEntity.prototype.copy.call(this, resolver, copies);
-
-               var members = this.members.map(function(member) {
-                   return Object.assign({}, member, { id: resolver.entity(member.id).copy(resolver, copies).id });
-               });
-
-               copy = copy.update({members: members});
-               copies[this.id] = copy;
-
-               return copy;
-           },
-
-
-           extent: function(resolver, memo) {
-               return resolver.transient(this, 'extent', function() {
-                   if (memo && memo[this.id]) return geoExtent();
-                   memo = memo || {};
-                   memo[this.id] = true;
-
-                   var extent = geoExtent();
-                   for (var i = 0; i < this.members.length; i++) {
-                       var member = resolver.hasEntity(this.members[i].id);
-                       if (member) {
-                           extent._extend(member.extent(resolver, memo));
-                       }
-                   }
-                   return extent;
-               });
-           },
-
-
-           geometry: function(graph) {
-               return graph.transient(this, 'geometry', function() {
-                   return this.isMultipolygon() ? 'area' : 'relation';
-               });
-           },
-
-
-           isDegenerate: function() {
-               return this.members.length === 0;
-           },
-
-
-           // Return an array of members, each extended with an 'index' property whose value
-           // is the member index.
-           indexedMembers: function() {
-               var result = new Array(this.members.length);
-               for (var i = 0; i < this.members.length; i++) {
-                   result[i] = Object.assign({}, this.members[i], {index: i});
-               }
-               return result;
-           },
-
-
-           // Return the first member with the given role. A copy of the member object
-           // is returned, extended with an 'index' property whose value is the member index.
-           memberByRole: function(role) {
-               for (var i = 0; i < this.members.length; i++) {
-                   if (this.members[i].role === role) {
-                       return Object.assign({}, this.members[i], {index: i});
-                   }
-               }
-           },
-
-           // Same as memberByRole, but returns all members with the given role
-           membersByRole: function(role) {
-               var result = [];
-               for (var i = 0; i < this.members.length; i++) {
-                   if (this.members[i].role === role) {
-                       result.push(Object.assign({}, this.members[i], {index: i}));
-                   }
-               }
-               return result;
-           },
-
-           // Return the first member with the given id. A copy of the member object
-           // is returned, extended with an 'index' property whose value is the member index.
-           memberById: function(id) {
-               for (var i = 0; i < this.members.length; i++) {
-                   if (this.members[i].id === id) {
-                       return Object.assign({}, this.members[i], {index: i});
-                   }
-               }
-           },
-
-
-           // Return the first member with the given id and role. A copy of the member object
-           // is returned, extended with an 'index' property whose value is the member index.
-           memberByIdAndRole: function(id, role) {
-               for (var i = 0; i < this.members.length; i++) {
-                   if (this.members[i].id === id && this.members[i].role === role) {
-                       return Object.assign({}, this.members[i], {index: i});
-                   }
-               }
-           },
-
-
-           addMember: function(member, index) {
-               var members = this.members.slice();
-               members.splice(index === undefined ? members.length : index, 0, member);
-               return this.update({members: members});
-           },
-
-
-           updateMember: function(member, index) {
-               var members = this.members.slice();
-               members.splice(index, 1, Object.assign({}, members[index], member));
-               return this.update({members: members});
-           },
-
-
-           removeMember: function(index) {
-               var members = this.members.slice();
-               members.splice(index, 1);
-               return this.update({members: members});
-           },
-
-
-           removeMembersWithID: function(id) {
-               var members = this.members.filter(function(m) { return m.id !== id; });
-               return this.update({members: members});
-           },
-
-           moveMember: function(fromIndex, toIndex) {
-               var members = this.members.slice();
-               members.splice(toIndex, 0, members.splice(fromIndex, 1)[0]);
-               return this.update({members: members});
-           },
-
-
-           // Wherever a member appears with id `needle.id`, replace it with a member
-           // with id `replacement.id`, type `replacement.type`, and the original role,
-           // By default, adding a duplicate member (by id and role) is prevented.
-           // Return an updated relation.
-           replaceMember: function(needle, replacement, keepDuplicates) {
-               if (!this.memberById(needle.id)) return this;
-
-               var members = [];
-
-               for (var i = 0; i < this.members.length; i++) {
-                   var member = this.members[i];
-                   if (member.id !== needle.id) {
-                       members.push(member);
-                   } else if (keepDuplicates || !this.memberByIdAndRole(replacement.id, member.role)) {
-                       members.push({ id: replacement.id, type: replacement.type, role: member.role });
-                   }
-               }
-
-               return this.update({ members: members });
-           },
-
-
-           asJXON: function(changeset_id) {
-               var r = {
-                   relation: {
-                       '@id': this.osmId(),
-                       '@version': this.version || 0,
-                       member: this.members.map(function(member) {
-                           return {
-                               keyAttributes: {
-                                   type: member.type,
-                                   role: member.role,
-                                   ref: osmEntity.id.toOSM(member.id)
-                               }
-                           };
-                       }, this),
-                       tag: Object.keys(this.tags).map(function(k) {
-                           return { keyAttributes: { k: k, v: this.tags[k] } };
-                       }, this)
-                   }
-               };
-               if (changeset_id) {
-                   r.relation['@changeset'] = changeset_id;
-               }
-               return r;
-           },
-
-
-           asGeoJSON: function(resolver) {
-               return resolver.transient(this, 'GeoJSON', function () {
-                   if (this.isMultipolygon()) {
-                       return {
-                           type: 'MultiPolygon',
-                           coordinates: this.multipolygon(resolver)
-                       };
-                   } else {
-                       return {
-                           type: 'FeatureCollection',
-                           properties: this.tags,
-                           features: this.members.map(function (member) {
-                               return Object.assign({role: member.role}, resolver.entity(member.id).asGeoJSON(resolver));
-                           })
-                       };
-                   }
-               });
-           },
-
-
-           area: function(resolver) {
-               return resolver.transient(this, 'area', function() {
-                   return d3_geoArea(this.asGeoJSON(resolver));
-               });
-           },
-
-
-           isMultipolygon: function() {
-               return this.tags.type === 'multipolygon';
-           },
-
-
-           isComplete: function(resolver) {
-               for (var i = 0; i < this.members.length; i++) {
-                   if (!resolver.hasEntity(this.members[i].id)) {
-                       return false;
-                   }
-               }
-               return true;
-           },
-
-
-           hasFromViaTo: function() {
-               return (
-                   this.members.some(function(m) { return m.role === 'from'; }) &&
-                   this.members.some(function(m) { return m.role === 'via'; }) &&
-                   this.members.some(function(m) { return m.role === 'to'; })
-               );
-           },
-
-
-           isRestriction: function() {
-               return !!(this.tags.type && this.tags.type.match(/^restriction:?/));
-           },
-
-
-           isValidRestriction: function() {
-               if (!this.isRestriction()) return false;
-
-               var froms = this.members.filter(function(m) { return m.role === 'from'; });
-               var vias = this.members.filter(function(m) { return m.role === 'via'; });
-               var tos = this.members.filter(function(m) { return m.role === 'to'; });
-
-               if (froms.length !== 1 && this.tags.restriction !== 'no_entry') return false;
-               if (froms.some(function(m) { return m.type !== 'way'; })) return false;
-
-               if (tos.length !== 1 && this.tags.restriction !== 'no_exit') return false;
-               if (tos.some(function(m) { return m.type !== 'way'; })) return false;
-
-               if (vias.length === 0) return false;
-               if (vias.length > 1 && vias.some(function(m) { return m.type !== 'way'; })) return false;
-
-               return true;
-           },
-
-
-           // Returns an array [A0, ... An], each Ai being an array of node arrays [Nds0, ... Ndsm],
-           // where Nds0 is an outer ring and subsequent Ndsi's (if any i > 0) being inner rings.
-           //
-           // This corresponds to the structure needed for rendering a multipolygon path using a
-           // `evenodd` fill rule, as well as the structure of a GeoJSON MultiPolygon geometry.
-           //
-           // In the case of invalid geometries, this function will still return a result which
-           // includes the nodes of all way members, but some Nds may be unclosed and some inner
-           // rings not matched with the intended outer ring.
-           //
-           multipolygon: function(resolver) {
-               var outers = this.members.filter(function(m) { return 'outer' === (m.role || 'outer'); });
-               var inners = this.members.filter(function(m) { return 'inner' === m.role; });
-
-               outers = osmJoinWays(outers, resolver);
-               inners = osmJoinWays(inners, resolver);
-
-               var sequenceToLineString = function(sequence) {
-                   if (sequence.nodes.length > 2 &&
-                       sequence.nodes[0] !== sequence.nodes[sequence.nodes.length - 1]) {
-                       // close unclosed parts to ensure correct area rendering - #2945
-                       sequence.nodes.push(sequence.nodes[0]);
-                   }
-                   return sequence.nodes.map(function(node) { return node.loc; });
-               };
-
-               outers = outers.map(sequenceToLineString);
-               inners = inners.map(sequenceToLineString);
-
-               var result = outers.map(function(o) {
-                   // Heuristic for detecting counterclockwise winding order. Assumes
-                   // that OpenStreetMap polygons are not hemisphere-spanning.
-                   return [d3_geoArea({ type: 'Polygon', coordinates: [o] }) > 2 * Math.PI ? o.reverse() : o];
-               });
-
-               function findOuter(inner) {
-                   var o, outer;
-
-                   for (o = 0; o < outers.length; o++) {
-                       outer = outers[o];
-                       if (geoPolygonContainsPolygon(outer, inner))
-                           return o;
-                   }
-
-                   for (o = 0; o < outers.length; o++) {
-                       outer = outers[o];
-                       if (geoPolygonIntersectsPolygon(outer, inner, false))
-                           return o;
-                   }
-               }
-
-               for (var i = 0; i < inners.length; i++) {
-                   var inner = inners[i];
-
-                   if (d3_geoArea({ type: 'Polygon', coordinates: [inner] }) < 2 * Math.PI) {
-                       inner = inner.reverse();
-                   }
-
-                   var o = findOuter(inners[i]);
-                   if (o !== undefined) {
-                       result[o].push(inners[i]);
-                   } else {
-                       result.push([inners[i]]); // Invalid geometry
-                   }
-               }
-
-               return result;
-           }
-       });
-
-       class QAItem {
-         constructor(loc, service, itemType, id, props) {
-           // Store required properties
-           this.loc = loc;
-           this.service = service.title;
-           this.itemType = itemType;
-
-           // All issues must have an ID for selection, use generic if none specified
-           this.id = id ? id : `${QAItem.id()}`;
-
-           this.update(props);
-
-           // Some QA services have marker icons to differentiate issues
-           if (service && typeof service.getIcon === 'function') {
-             this.icon = service.getIcon(itemType);
-           }
-
-           return this;
-         }
-
-         update(props) {
-           // You can't override this inital information
-           const { loc, service, itemType, id } = this;
-
-           Object.keys(props).forEach(prop => this[prop] = props[prop]);
-
-           this.loc = loc;
-           this.service = service;
-           this.itemType = itemType;
-           this.id = id;
-
-           return this;
-         }
-
-         // Generic handling for newly created QAItems
-         static id() {
-           return this.nextId--;
-         }
-       }
-       QAItem.nextId = -1;
-
-       // Split a way at the given node.
-       //
-       // Optionally, split only the given ways, if multiple ways share
-       // the given node.
-       //
-       // This is the inverse of `iD.actionJoin`.
-       //
-       // For testing convenience, accepts an ID to assign to the new way.
-       // Normally, this will be undefined and the way will automatically
-       // be assigned a new ID.
-       //
-       // Reference:
-       //   https://github.com/systemed/potlatch2/blob/master/net/systemeD/halcyon/connection/actions/SplitWayAction.as
-       //
-       function actionSplit(nodeId, newWayIds) {
-           var _wayIDs;
-
-           // The IDs of the ways actually created by running this action
-           var createdWayIDs = [];
-
-           // If the way is closed, we need to search for a partner node
-           // to split the way at.
-           //
-           // The following looks for a node that is both far away from
-           // the initial node in terms of way segment length and nearby
-           // in terms of beeline-distance. This assures that areas get
-           // split on the most "natural" points (independent of the number
-           // of nodes).
-           // For example: bone-shaped areas get split across their waist
-           // line, circles across the diameter.
-           function splitArea(nodes, idxA, graph) {
-               var lengths = new Array(nodes.length);
-               var length;
-               var i;
-               var best = 0;
-               var idxB;
-
-               function wrap(index) {
-                   return utilWrap(index, nodes.length);
-               }
-
-               function dist(nA, nB) {
-                   var locA = graph.entity(nA).loc;
-                   var locB = graph.entity(nB).loc;
-                   var epsilon = 1e-6;
-                   return (locA && locB) ? geoSphericalDistance(locA, locB) : epsilon;
-               }
-
-               // calculate lengths
-               length = 0;
-               for (i = wrap(idxA + 1); i !== idxA; i = wrap(i + 1)) {
-                   length += dist(nodes[i], nodes[wrap(i - 1)]);
-                   lengths[i] = length;
-               }
-
-               length = 0;
-               for (i = wrap(idxA - 1); i !== idxA; i = wrap(i - 1)) {
-                   length += dist(nodes[i], nodes[wrap(i + 1)]);
-                   if (length < lengths[i]) {
-                       lengths[i] = length;
-                   }
-               }
-
-               // determine best opposite node to split
-               for (i = 0; i < nodes.length; i++) {
-                   var cost = lengths[i] / dist(nodes[idxA], nodes[i]);
-                   if (cost > best) {
-                       idxB = i;
-                       best = cost;
-                   }
-               }
-
-               return idxB;
-           }
-
-
-           function split(graph, wayA, newWayId) {
-               var wayB = osmWay({ id: newWayId, tags: wayA.tags });   // `wayB` is the NEW way
-               var origNodes = wayA.nodes.slice();
-               var nodesA;
-               var nodesB;
-               var isArea = wayA.isArea();
-               var isOuter = osmIsOldMultipolygonOuterMember(wayA, graph);
-
-               if (wayA.isClosed()) {
-                   var nodes = wayA.nodes.slice(0, -1);
-                   var idxA = nodes.indexOf(nodeId);
-                   var idxB = splitArea(nodes, idxA, graph);
-
-                   if (idxB < idxA) {
-                       nodesA = nodes.slice(idxA).concat(nodes.slice(0, idxB + 1));
-                       nodesB = nodes.slice(idxB, idxA + 1);
-                   } else {
-                       nodesA = nodes.slice(idxA, idxB + 1);
-                       nodesB = nodes.slice(idxB).concat(nodes.slice(0, idxA + 1));
-                   }
-               } else {
-                   var idx = wayA.nodes.indexOf(nodeId, 1);
-                   nodesA = wayA.nodes.slice(0, idx + 1);
-                   nodesB = wayA.nodes.slice(idx);
-               }
-
-               wayA = wayA.update({ nodes: nodesA });
-               wayB = wayB.update({ nodes: nodesB });
-
-               graph = graph.replace(wayA);
-               graph = graph.replace(wayB);
-
-               graph.parentRelations(wayA).forEach(function(relation) {
-                   var member;
-
-                   // Turn restrictions - make sure:
-                   // 1. Splitting a FROM/TO way - only `wayA` OR `wayB` remains in relation
-                   //    (whichever one is connected to the VIA node/ways)
-                   // 2. Splitting a VIA way - `wayB` remains in relation as a VIA way
-                   if (relation.hasFromViaTo()) {
-                       var f = relation.memberByRole('from');
-                       var v = relation.membersByRole('via');
-                       var t = relation.memberByRole('to');
-                       var i;
-
-                       // 1. split a FROM/TO
-                       if (f.id === wayA.id || t.id === wayA.id) {
-                           var keepB = false;
-                           if (v.length === 1 && v[0].type === 'node') {   // check via node
-                               keepB = wayB.contains(v[0].id);
-                           } else {                                        // check via way(s)
-                               for (i = 0; i < v.length; i++) {
-                                   if (v[i].type === 'way') {
-                                       var wayVia = graph.hasEntity(v[i].id);
-                                       if (wayVia && utilArrayIntersection(wayB.nodes, wayVia.nodes).length) {
-                                           keepB = true;
-                                           break;
-                                       }
-                                   }
-                               }
-                           }
-
-                           if (keepB) {
-                               relation = relation.replaceMember(wayA, wayB);
-                               graph = graph.replace(relation);
-                           }
-
-                       // 2. split a VIA
-                       } else {
-                           for (i = 0; i < v.length; i++) {
-                               if (v[i].type === 'way' && v[i].id === wayA.id) {
-                                   member = {
-                                       id: wayB.id,
-                                       type: 'way',
-                                       role: 'via'
-                                   };
-                                   graph = actionAddMember(relation.id, member, v[i].index + 1)(graph);
-                                   break;
-                               }
-                           }
-                       }
-
-                   // All other relations (Routes, Multipolygons, etc):
-                   // 1. Both `wayA` and `wayB` remain in the relation
-                   // 2. But must be inserted as a pair (see `actionAddMember` for details)
-                   } else {
-                       if (relation === isOuter) {
-                           graph = graph.replace(relation.mergeTags(wayA.tags));
-                           graph = graph.replace(wayA.update({ tags: {} }));
-                           graph = graph.replace(wayB.update({ tags: {} }));
-                       }
-
-                       member = {
-                           id: wayB.id,
-                           type: 'way',
-                           role: relation.memberById(wayA.id).role
-                       };
-
-                       var insertPair = {
-                           originalID: wayA.id,
-                           insertedID: wayB.id,
-                           nodes: origNodes
-                       };
-
-                       graph = actionAddMember(relation.id, member, undefined, insertPair)(graph);
-                   }
-               });
-
-               if (!isOuter && isArea) {
-                   var multipolygon = osmRelation({
-                       tags: Object.assign({}, wayA.tags, { type: 'multipolygon' }),
-                       members: [
-                           { id: wayA.id, role: 'outer', type: 'way' },
-                           { id: wayB.id, role: 'outer', type: 'way' }
-                       ]
-                   });
-
-                   graph = graph.replace(multipolygon);
-                   graph = graph.replace(wayA.update({ tags: {} }));
-                   graph = graph.replace(wayB.update({ tags: {} }));
-               }
-
-               createdWayIDs.push(wayB.id);
-
-               return graph;
-           }
-
-           var action = function(graph) {
-               var candidates = action.ways(graph);
-               createdWayIDs = [];
-               for (var i = 0; i < candidates.length; i++) {
-                   graph = split(graph, candidates[i], newWayIds && newWayIds[i]);
-               }
-               return graph;
-           };
-
-           action.getCreatedWayIDs = function() {
-               return createdWayIDs;
-           };
-
-           action.ways = function(graph) {
-               var node = graph.entity(nodeId);
-               var parents = graph.parentWays(node);
-               var hasLines = parents.some(function(parent) {
-                   return parent.geometry(graph) === 'line';
-               });
-
-               return parents.filter(function(parent) {
-                   if (_wayIDs && _wayIDs.indexOf(parent.id) === -1)
-                       return false;
-
-                   if (!_wayIDs && hasLines && parent.geometry(graph) !== 'line')
-                       return false;
-
-                   if (parent.isClosed()) {
-                       return true;
-                   }
-
-                   for (var i = 1; i < parent.nodes.length - 1; i++) {
-                       if (parent.nodes[i] === nodeId) {
-                           return true;
-                       }
-                   }
-
-                   return false;
-               });
-           };
-
-
-           action.disabled = function(graph) {
-               var candidates = action.ways(graph);
-               if (candidates.length === 0 || (_wayIDs && _wayIDs.length !== candidates.length)) {
-                   return 'not_eligible';
-               }
-           };
-
-
-           action.limitWays = function(val) {
-               if (!arguments.length) return _wayIDs;
-               _wayIDs = val;
-               return action;
-           };
-
-
-           return action;
-       }
-
-       function coreGraph(other, mutable) {
-           if (!(this instanceof coreGraph)) return new coreGraph(other, mutable);
-
-           if (other instanceof coreGraph) {
-               var base = other.base();
-               this.entities = Object.assign(Object.create(base.entities), other.entities);
-               this._parentWays = Object.assign(Object.create(base.parentWays), other._parentWays);
-               this._parentRels = Object.assign(Object.create(base.parentRels), other._parentRels);
-
-           } else {
-               this.entities = Object.create({});
-               this._parentWays = Object.create({});
-               this._parentRels = Object.create({});
-               this.rebase(other || [], [this]);
-           }
-
-           this.transients = {};
-           this._childNodes = {};
-           this.frozen = !mutable;
-       }
-
-
-       coreGraph.prototype = {
-
-           hasEntity: function(id) {
-               return this.entities[id];
-           },
-
-
-           entity: function(id) {
-               var entity = this.entities[id];
-
-               //https://github.com/openstreetmap/iD/issues/3973#issuecomment-307052376
-               if (!entity) {
-                   entity = this.entities.__proto__[id];  // eslint-disable-line no-proto
-               }
-
-               if (!entity) {
-                   throw new Error('entity ' + id + ' not found');
-               }
-               return entity;
-           },
-
-
-           geometry: function(id) {
-               return this.entity(id).geometry(this);
-           },
-
-
-           transient: function(entity, key, fn) {
-               var id = entity.id;
-               var transients = this.transients[id] || (this.transients[id] = {});
-
-               if (transients[key] !== undefined) {
-                   return transients[key];
-               }
-
-               transients[key] = fn.call(entity);
-
-               return transients[key];
-           },
-
-
-           parentWays: function(entity) {
-               var parents = this._parentWays[entity.id];
-               var result = [];
-               if (parents) {
-                   parents.forEach(function(id) {
-                       result.push(this.entity(id));
-                   }, this);
-               }
-               return result;
-           },
-
-
-           isPoi: function(entity) {
-               var parents = this._parentWays[entity.id];
-               return !parents || parents.size === 0;
-           },
-
-
-           isShared: function(entity) {
-               var parents = this._parentWays[entity.id];
-               return parents && parents.size > 1;
-           },
-
-
-           parentRelations: function(entity) {
-               var parents = this._parentRels[entity.id];
-               var result = [];
-               if (parents) {
-                   parents.forEach(function(id) {
-                       result.push(this.entity(id));
-                   }, this);
-               }
-               return result;
-           },
-
-           parentMultipolygons: function(entity) {
-               return this.parentRelations(entity).filter(function(relation) {
-                   return relation.isMultipolygon();
-               });
-           },
-
-
-           childNodes: function(entity) {
-               if (this._childNodes[entity.id]) return this._childNodes[entity.id];
-               if (!entity.nodes) return [];
-
-               var nodes = [];
-               for (var i = 0; i < entity.nodes.length; i++) {
-                   nodes[i] = this.entity(entity.nodes[i]);
-               }
-
-               this._childNodes[entity.id] = nodes;
-               return this._childNodes[entity.id];
-           },
-
-
-           base: function() {
-               return {
-                   'entities': Object.getPrototypeOf(this.entities),
-                   'parentWays': Object.getPrototypeOf(this._parentWays),
-                   'parentRels': Object.getPrototypeOf(this._parentRels)
-               };
-           },
-
-
-           // Unlike other graph methods, rebase mutates in place. This is because it
-           // is used only during the history operation that merges newly downloaded
-           // data into each state. To external consumers, it should appear as if the
-           // graph always contained the newly downloaded data.
-           rebase: function(entities, stack, force) {
-               var base = this.base();
-               var i, j, k, id;
-
-               for (i = 0; i < entities.length; i++) {
-                   var entity = entities[i];
-
-                   if (!entity.visible || (!force && base.entities[entity.id]))
-                       continue;
-
-                   // Merging data into the base graph
-                   base.entities[entity.id] = entity;
-                   this._updateCalculated(undefined, entity, base.parentWays, base.parentRels);
-
-                   // Restore provisionally-deleted nodes that are discovered to have an extant parent
-                   if (entity.type === 'way') {
-                       for (j = 0; j < entity.nodes.length; j++) {
-                           id = entity.nodes[j];
-                           for (k = 1; k < stack.length; k++) {
-                               var ents = stack[k].entities;
-                               if (ents.hasOwnProperty(id) && ents[id] === undefined) {
-                                   delete ents[id];
-                               }
-                           }
-                       }
-                   }
-               }
-
-               for (i = 0; i < stack.length; i++) {
-                   stack[i]._updateRebased();
-               }
-           },
-
-
-           _updateRebased: function() {
-               var base = this.base();
-
-               Object.keys(this._parentWays).forEach(function(child) {
-                   if (base.parentWays[child]) {
-                       base.parentWays[child].forEach(function(id) {
-                           if (!this.entities.hasOwnProperty(id)) {
-                               this._parentWays[child].add(id);
-                           }
-                       }, this);
-                   }
-               }, this);
-
-               Object.keys(this._parentRels).forEach(function(child) {
-                   if (base.parentRels[child]) {
-                       base.parentRels[child].forEach(function(id) {
-                           if (!this.entities.hasOwnProperty(id)) {
-                               this._parentRels[child].add(id);
-                           }
-                       }, this);
-                   }
-               }, this);
-
-               this.transients = {};
-
-               // this._childNodes is not updated, under the assumption that
-               // ways are always downloaded with their child nodes.
-           },
-
-
-           // Updates calculated properties (parentWays, parentRels) for the specified change
-           _updateCalculated: function(oldentity, entity, parentWays, parentRels) {
-               parentWays = parentWays || this._parentWays;
-               parentRels = parentRels || this._parentRels;
-
-               var type = entity && entity.type || oldentity && oldentity.type;
-               var removed, added, i;
-
-               if (type === 'way') {   // Update parentWays
-                   if (oldentity && entity) {
-                       removed = utilArrayDifference(oldentity.nodes, entity.nodes);
-                       added = utilArrayDifference(entity.nodes, oldentity.nodes);
-                   } else if (oldentity) {
-                       removed = oldentity.nodes;
-                       added = [];
-                   } else if (entity) {
-                       removed = [];
-                       added = entity.nodes;
-                   }
-                   for (i = 0; i < removed.length; i++) {
-                       // make a copy of prototype property, store as own property, and update..
-                       parentWays[removed[i]] = new Set(parentWays[removed[i]]);
-                       parentWays[removed[i]].delete(oldentity.id);
-                   }
-                   for (i = 0; i < added.length; i++) {
-                       // make a copy of prototype property, store as own property, and update..
-                       parentWays[added[i]] = new Set(parentWays[added[i]]);
-                       parentWays[added[i]].add(entity.id);
-                   }
-
-               } else if (type === 'relation') {   // Update parentRels
-
-                   // diff only on the IDs since the same entity can be a member multiple times with different roles
-                   var oldentityMemberIDs = oldentity ? oldentity.members.map(function(m) { return m.id; }) : [];
-                   var entityMemberIDs = entity ? entity.members.map(function(m) { return m.id; }) : [];
-
-                   if (oldentity && entity) {
-                       removed = utilArrayDifference(oldentityMemberIDs, entityMemberIDs);
-                       added = utilArrayDifference(entityMemberIDs, oldentityMemberIDs);
-                   } else if (oldentity) {
-                       removed = oldentityMemberIDs;
-                       added = [];
-                   } else if (entity) {
-                       removed = [];
-                       added = entityMemberIDs;
-                   }
-                   for (i = 0; i < removed.length; i++) {
-                       // make a copy of prototype property, store as own property, and update..
-                       parentRels[removed[i]] = new Set(parentRels[removed[i]]);
-                       parentRels[removed[i]].delete(oldentity.id);
-                   }
-                   for (i = 0; i < added.length; i++) {
-                       // make a copy of prototype property, store as own property, and update..
-                       parentRels[added[i]] = new Set(parentRels[added[i]]);
-                       parentRels[added[i]].add(entity.id);
-                   }
-               }
-           },
-
-
-           replace: function(entity) {
-               if (this.entities[entity.id] === entity) return this;
-
-               return this.update(function() {
-                   this._updateCalculated(this.entities[entity.id], entity);
-                   this.entities[entity.id] = entity;
-               });
-           },
-
-
-           remove: function(entity) {
-               return this.update(function() {
-                   this._updateCalculated(entity, undefined);
-                   this.entities[entity.id] = undefined;
-               });
-           },
-
-
-           revert: function(id) {
-               var baseEntity = this.base().entities[id];
-               var headEntity = this.entities[id];
-               if (headEntity === baseEntity) return this;
-
-               return this.update(function() {
-                   this._updateCalculated(headEntity, baseEntity);
-                   delete this.entities[id];
-               });
-           },
-
-
-           update: function() {
-               var graph = this.frozen ? coreGraph(this, true) : this;
-               for (var i = 0; i < arguments.length; i++) {
-                   arguments[i].call(graph, graph);
-               }
-
-               if (this.frozen) graph.frozen = true;
-
-               return graph;
-           },
-
-
-           // Obliterates any existing entities
-           load: function(entities) {
-               var base = this.base();
-               this.entities = Object.create(base.entities);
-
-               for (var i in entities) {
-                   this.entities[i] = entities[i];
-                   this._updateCalculated(base.entities[i], this.entities[i]);
-               }
-
-               return this;
-           }
-       };
-
-       function osmTurn(turn) {
-           if (!(this instanceof osmTurn)) {
-               return new osmTurn(turn);
-           }
-           Object.assign(this, turn);
-       }
-
-
-       function osmIntersection(graph, startVertexId, maxDistance) {
-           maxDistance = maxDistance || 30;    // in meters
-           var vgraph = coreGraph();           // virtual graph
-           var i, j, k;
-
-
-           function memberOfRestriction(entity) {
-               return graph.parentRelations(entity)
-                   .some(function(r) { return r.isRestriction(); });
-           }
-
-           function isRoad(way) {
-               if (way.isArea() || way.isDegenerate()) return false;
-               var roads = {
-                   'motorway': true,
-                   'motorway_link': true,
-                   'trunk': true,
-                   'trunk_link': true,
-                   'primary': true,
-                   'primary_link': true,
-                   'secondary': true,
-                   'secondary_link': true,
-                   'tertiary': true,
-                   'tertiary_link': true,
-                   'residential': true,
-                   'unclassified': true,
-                   'living_street': true,
-                   'service': true,
-                   'road': true,
-                   'track': true
-               };
-               return roads[way.tags.highway];
-           }
-
-
-           var startNode = graph.entity(startVertexId);
-           var checkVertices = [startNode];
-           var checkWays;
-           var vertices = [];
-           var vertexIds = [];
-           var vertex;
-           var ways = [];
-           var wayIds = [];
-           var way;
-           var nodes = [];
-           var node;
-           var parents = [];
-           var parent;
-
-           // `actions` will store whatever actions must be performed to satisfy
-           // preconditions for adding a turn restriction to this intersection.
-           //  - Remove any existing degenerate turn restrictions (missing from/to, etc)
-           //  - Reverse oneways so that they are drawn in the forward direction
-           //  - Split ways on key vertices
-           var actions = [];
-
-
-           // STEP 1:  walk the graph outwards from starting vertex to search
-           //  for more key vertices and ways to include in the intersection..
-
-           while (checkVertices.length) {
-               vertex = checkVertices.pop();
-
-               // check this vertex for parent ways that are roads
-               checkWays = graph.parentWays(vertex);
-               var hasWays = false;
-               for (i = 0; i < checkWays.length; i++) {
-                   way = checkWays[i];
-                   if (!isRoad(way) && !memberOfRestriction(way)) continue;
-
-                   ways.push(way);   // it's a road, or it's already in a turn restriction
-                   hasWays = true;
-
-                   // check the way's children for more key vertices
-                   nodes = utilArrayUniq(graph.childNodes(way));
-                   for (j = 0; j < nodes.length; j++) {
-                       node = nodes[j];
-                       if (node === vertex) continue;                                           // same thing
-                       if (vertices.indexOf(node) !== -1) continue;                             // seen it already
-                       if (geoSphericalDistance(node.loc, startNode.loc) > maxDistance) continue;   // too far from start
-
-                       // a key vertex will have parents that are also roads
-                       var hasParents = false;
-                       parents = graph.parentWays(node);
-                       for (k = 0; k < parents.length; k++) {
-                           parent = parents[k];
-                           if (parent === way) continue;                 // same thing
-                           if (ways.indexOf(parent) !== -1) continue;    // seen it already
-                           if (!isRoad(parent)) continue;                // not a road
-                           hasParents = true;
-                           break;
-                       }
-
-                       if (hasParents) {
-                           checkVertices.push(node);
-                       }
-                   }
-               }
-
-               if (hasWays) {
-                   vertices.push(vertex);
-               }
-           }
-
-           vertices = utilArrayUniq(vertices);
-           ways = utilArrayUniq(ways);
-
-
-           // STEP 2:  Build a virtual graph containing only the entities in the intersection..
-           // Everything done after this step should act on the virtual graph
-           // Any actions that must be performed later to the main graph go in `actions` array
-           ways.forEach(function(way) {
-               graph.childNodes(way).forEach(function(node) {
-                   vgraph = vgraph.replace(node);
-               });
-
-               vgraph = vgraph.replace(way);
-
-               graph.parentRelations(way).forEach(function(relation) {
-                   if (relation.isRestriction()) {
-                       if (relation.isValidRestriction(graph)) {
-                           vgraph = vgraph.replace(relation);
-                       } else if (relation.isComplete(graph)) {
-                           actions.push(actionDeleteRelation(relation.id));
-                       }
-                   }
-               });
-           });
-
-
-           // STEP 3:  Force all oneways to be drawn in the forward direction
-           ways.forEach(function(w) {
-               var way = vgraph.entity(w.id);
-               if (way.tags.oneway === '-1') {
-                   var action = actionReverse(way.id, { reverseOneway: true });
-                   actions.push(action);
-                   vgraph = action(vgraph);
-               }
-           });
-
-
-           // STEP 4:  Split ways on key vertices
-           var origCount = osmEntity.id.next.way;
-           vertices.forEach(function(v) {
-               // This is an odd way to do it, but we need to find all the ways that
-               // will be split here, then split them one at a time to ensure that these
-               // actions can be replayed on the main graph exactly in the same order.
-               // (It is unintuitive, but the order of ways returned from graph.parentWays()
-               // is arbitrary, depending on how the main graph and vgraph were built)
-               var splitAll = actionSplit(v.id);
-               if (!splitAll.disabled(vgraph)) {
-                   splitAll.ways(vgraph).forEach(function(way) {
-                       var splitOne = actionSplit(v.id).limitWays([way.id]);
-                       actions.push(splitOne);
-                       vgraph = splitOne(vgraph);
-                   });
-               }
-           });
-
-           // In here is where we should also split the intersection at nearby junction.
-           //   for https://github.com/mapbox/iD-internal/issues/31
-           // nearbyVertices.forEach(function(v) {
-           // });
-
-           // Reasons why we reset the way id count here:
-           //  1. Continuity with way ids created by the splits so that we can replay
-           //     these actions later if the user decides to create a turn restriction
-           //  2. Avoids churning way ids just by hovering over a vertex
-           //     and displaying the turn restriction editor
-           osmEntity.id.next.way = origCount;
-
-
-           // STEP 5:  Update arrays to point to vgraph entities
-           vertexIds = vertices.map(function(v) { return v.id; });
-           vertices = [];
-           ways = [];
-
-           vertexIds.forEach(function(id) {
-               var vertex = vgraph.entity(id);
-               var parents = vgraph.parentWays(vertex);
-               vertices.push(vertex);
-               ways = ways.concat(parents);
-           });
-
-           vertices = utilArrayUniq(vertices);
-           ways = utilArrayUniq(ways);
-
-           vertexIds = vertices.map(function(v) { return v.id; });
-           wayIds = ways.map(function(w) { return w.id; });
-
-
-           // STEP 6:  Update the ways with some metadata that will be useful for
-           // walking the intersection graph later and rendering turn arrows.
-
-           function withMetadata(way, vertexIds) {
-               var __oneWay = way.isOneWay();
-
-               // which affixes are key vertices?
-               var __first = (vertexIds.indexOf(way.first()) !== -1);
-               var __last = (vertexIds.indexOf(way.last()) !== -1);
-
-               // what roles is this way eligible for?
-               var __via = (__first && __last);
-               var __from = ((__first && !__oneWay) || __last);
-               var __to = (__first || (__last && !__oneWay));
-
-               return way.update({
-                   __first:  __first,
-                   __last:  __last,
-                   __from:  __from,
-                   __via: __via,
-                   __to:  __to,
-                   __oneWay:  __oneWay
-               });
-           }
-
-           ways = [];
-           wayIds.forEach(function(id) {
-               var way = withMetadata(vgraph.entity(id), vertexIds);
-               vgraph = vgraph.replace(way);
-               ways.push(way);
-           });
-
-
-           // STEP 7:  Simplify - This is an iterative process where we:
-           //  1. Find trivial vertices with only 2 parents
-           //  2. trim off the leaf way from those vertices and remove from vgraph
-
-           var keepGoing;
-           var removeWayIds = [];
-           var removeVertexIds = [];
-
-           do {
-               keepGoing = false;
-               checkVertices = vertexIds.slice();
-
-               for (i = 0; i < checkVertices.length; i++) {
-                   var vertexId = checkVertices[i];
-                   vertex = vgraph.hasEntity(vertexId);
-
-                   if (!vertex) {
-                       if (vertexIds.indexOf(vertexId) !== -1) {
-                           vertexIds.splice(vertexIds.indexOf(vertexId), 1);   // stop checking this one
-                       }
-                       removeVertexIds.push(vertexId);
-                       continue;
-                   }
-
-                   parents = vgraph.parentWays(vertex);
-                   if (parents.length < 3) {
-                       if (vertexIds.indexOf(vertexId) !== -1) {
-                           vertexIds.splice(vertexIds.indexOf(vertexId), 1);   // stop checking this one
-                       }
-                   }
-
-                   if (parents.length === 2) {     // vertex with 2 parents is trivial
-                       var a = parents[0];
-                       var b = parents[1];
-                       var aIsLeaf = a && !a.__via;
-                       var bIsLeaf = b && !b.__via;
-                       var leaf, survivor;
-
-                       if (aIsLeaf && !bIsLeaf) {
-                           leaf = a;
-                           survivor = b;
-                       } else if (!aIsLeaf && bIsLeaf) {
-                           leaf = b;
-                           survivor = a;
-                       }
-
-                       if (leaf && survivor) {
-                           survivor = withMetadata(survivor, vertexIds);      // update survivor way
-                           vgraph = vgraph.replace(survivor).remove(leaf);    // update graph
-                           removeWayIds.push(leaf.id);
-                           keepGoing = true;
-                       }
-                   }
-
-                   parents = vgraph.parentWays(vertex);
-
-                   if (parents.length < 2) {     // vertex is no longer a key vertex
-                       if (vertexIds.indexOf(vertexId) !== -1) {
-                           vertexIds.splice(vertexIds.indexOf(vertexId), 1);   // stop checking this one
-                       }
-                       removeVertexIds.push(vertexId);
-                       keepGoing = true;
-                   }
-
-                   if (parents.length < 1) {     // vertex is no longer attached to anything
-                       vgraph = vgraph.remove(vertex);
-                   }
-
-               }
-           } while (keepGoing);
-
-
-           vertices = vertices
-               .filter(function(vertex) { return removeVertexIds.indexOf(vertex.id) === -1; })
-               .map(function(vertex) { return vgraph.entity(vertex.id); });
-           ways = ways
-               .filter(function(way) { return removeWayIds.indexOf(way.id) === -1; })
-               .map(function(way) { return vgraph.entity(way.id); });
-
-
-           // OK!  Here is our intersection..
-           var intersection = {
-               graph: vgraph,
-               actions: actions,
-               vertices: vertices,
-               ways: ways,
-           };
-
-
-
-           // Get all the valid turns through this intersection given a starting way id.
-           // This operates on the virtual graph for everything.
-           //
-           // Basically, walk through all possible paths from starting way,
-           //   honoring the existing turn restrictions as we go (watch out for loops!)
-           //
-           // For each path found, generate and return a `osmTurn` datastructure.
-           //
-           intersection.turns = function(fromWayId, maxViaWay) {
-               if (!fromWayId) return [];
-               if (!maxViaWay) maxViaWay = 0;
-
-               var vgraph = intersection.graph;
-               var keyVertexIds = intersection.vertices.map(function(v) { return v.id; });
-
-               var start = vgraph.entity(fromWayId);
-               if (!start || !(start.__from || start.__via)) return [];
-
-               // maxViaWay=0   from-*-to              (0 vias)
-               // maxViaWay=1   from-*-via-*-to        (1 via max)
-               // maxViaWay=2   from-*-via-*-via-*-to  (2 vias max)
-               var maxPathLength = (maxViaWay * 2) + 3;
-               var turns = [];
-
-               step(start);
-               return turns;
-
-
-               // traverse the intersection graph and find all the valid paths
-               function step(entity, currPath, currRestrictions, matchedRestriction) {
-                   currPath = (currPath || []).slice();  // shallow copy
-                   if (currPath.length >= maxPathLength) return;
-                   currPath.push(entity.id);
-                   currRestrictions = (currRestrictions || []).slice();  // shallow copy
-                   var i, j;
-
-                   if (entity.type === 'node') {
-                       var parents = vgraph.parentWays(entity);
-                       var nextWays = [];
-
-                       // which ways can we step into?
-                       for (i = 0; i < parents.length; i++) {
-                           var way = parents[i];
-
-                           // if next way is a oneway incoming to this vertex, skip
-                           if (way.__oneWay && way.nodes[0] !== entity.id) continue;
-
-                           // if we have seen it before (allowing for an initial u-turn), skip
-                           if (currPath.indexOf(way.id) !== -1 && currPath.length >= 3) continue;
-
-                           // Check all "current" restrictions (where we've already walked the `FROM`)
-                           var restrict = undefined;
-                           for (j = 0; j < currRestrictions.length; j++) {
-                               var restriction = currRestrictions[j];
-                               var f = restriction.memberByRole('from');
-                               var v = restriction.membersByRole('via');
-                               var t = restriction.memberByRole('to');
-                               var isOnly = /^only_/.test(restriction.tags.restriction);
-
-                               // Does the current path match this turn restriction?
-                               var matchesFrom = (f.id === fromWayId);
-                               var matchesViaTo = false;
-                               var isAlongOnlyPath = false;
-
-                               if (t.id === way.id) {     // match TO
-
-                                   if (v.length === 1 && v[0].type === 'node') {    // match VIA node
-                                       matchesViaTo = (v[0].id === entity.id && (
-                                           (matchesFrom && currPath.length === 2) ||
-                                           (!matchesFrom && currPath.length > 2)
-                                       ));
-
-                                   } else {                                         // match all VIA ways
-                                       var pathVias = [];
-                                       for (k = 2; k < currPath.length; k +=2 ) {   // k = 2 skips FROM
-                                           pathVias.push(currPath[k]);              // (path goes way-node-way...)
-                                       }
-                                       var restrictionVias = [];
-                                       for (k = 0; k < v.length; k++) {
-                                           if (v[k].type === 'way') {
-                                               restrictionVias.push(v[k].id);
-                                           }
-                                       }
-                                       var diff = utilArrayDifference(pathVias, restrictionVias);
-                                       matchesViaTo = !diff.length;
-                                   }
-
-                               } else if (isOnly) {
-                                   for (k = 0; k < v.length; k++) {
-                                       // way doesn't match TO, but is one of the via ways along the path of an "only"
-                                       if (v[k].type === 'way' && v[k].id === way.id) {
-                                           isAlongOnlyPath = true;
-                                           break;
-                                       }
-                                   }
-                               }
-
-                               if (matchesViaTo) {
-                                   if (isOnly) {
-                                       restrict = { id: restriction.id, direct: matchesFrom, from: f.id, only: true, end: true };
-                                   } else {
-                                       restrict = { id: restriction.id, direct: matchesFrom, from: f.id, no: true, end: true };
-                                   }
-                               } else {    // indirect - caused by a different nearby restriction
-                                   if (isAlongOnlyPath) {
-                                       restrict = { id: restriction.id, direct: false, from: f.id, only: true, end: false };
-                                   } else if (isOnly) {
-                                       restrict = { id: restriction.id, direct: false, from: f.id, no: true, end: true };
-                                   }
-                               }
-
-                               // stop looking if we find a "direct" restriction (matching FROM, VIA, TO)
-                               if (restrict && restrict.direct)
-                                   break;
-                           }
-
-                           nextWays.push({ way: way, restrict: restrict });
-                       }
-
-                       nextWays.forEach(function(nextWay) {
-                           step(nextWay.way, currPath, currRestrictions, nextWay.restrict);
-                       });
-
-
-                   } else {  // entity.type === 'way'
-                       if (currPath.length >= 3) {     // this is a "complete" path..
-                           var turnPath = currPath.slice();   // shallow copy
-
-                           // an indirect restriction - only include the partial path (starting at FROM)
-                           if (matchedRestriction && matchedRestriction.direct === false) {
-                               for (i = 0; i < turnPath.length; i++) {
-                                   if (turnPath[i] === matchedRestriction.from) {
-                                       turnPath = turnPath.slice(i);
-                                       break;
-                                   }
-                               }
-                           }
-
-                           var turn = pathToTurn(turnPath);
-                           if (turn) {
-                               if (matchedRestriction) {
-                                   turn.restrictionID = matchedRestriction.id;
-                                   turn.no = matchedRestriction.no;
-                                   turn.only = matchedRestriction.only;
-                                   turn.direct = matchedRestriction.direct;
-                               }
-                               turns.push(osmTurn(turn));
-                           }
-
-                           if (currPath[0] === currPath[2]) return;   // if we made a u-turn - stop here
-                       }
-
-                       if (matchedRestriction && matchedRestriction.end) return;  // don't advance any further
-
-                       // which nodes can we step into?
-                       var n1 = vgraph.entity(entity.first());
-                       var n2 = vgraph.entity(entity.last());
-                       var dist = geoSphericalDistance(n1.loc, n2.loc);
-                       var nextNodes = [];
-
-                       if (currPath.length > 1) {
-                           if (dist > maxDistance) return;   // the next node is too far
-                           if (!entity.__via) return;        // this way is a leaf / can't be a via
-                       }
-
-                       if (!entity.__oneWay &&                     // bidirectional..
-                           keyVertexIds.indexOf(n1.id) !== -1 &&   // key vertex..
-                           currPath.indexOf(n1.id) === -1) {       // haven't seen it yet..
-                           nextNodes.push(n1);                     // can advance to first node
-                       }
-                       if (keyVertexIds.indexOf(n2.id) !== -1 &&   // key vertex..
-                           currPath.indexOf(n2.id) === -1) {       // haven't seen it yet..
-                           nextNodes.push(n2);                     // can advance to last node
-                       }
-
-                       nextNodes.forEach(function(nextNode) {
-                           // gather restrictions FROM this way
-                           var fromRestrictions = vgraph.parentRelations(entity).filter(function(r) {
-                               if (!r.isRestriction()) return false;
-
-                               var f = r.memberByRole('from');
-                               if (!f || f.id !== entity.id) return false;
-
-                               var isOnly = /^only_/.test(r.tags.restriction);
-                               if (!isOnly) return true;
-
-                               // `only_` restrictions only matter along the direction of the VIA - #4849
-                               var isOnlyVia = false;
-                               var v = r.membersByRole('via');
-                               if (v.length === 1 && v[0].type === 'node') {   // via node
-                                   isOnlyVia = (v[0].id === nextNode.id);
-                               } else {                                        // via way(s)
-                                   for (var i = 0; i < v.length; i++) {
-                                       if (v[i].type !== 'way') continue;
-                                       var viaWay = vgraph.entity(v[i].id);
-                                       if (viaWay.first() === nextNode.id || viaWay.last() === nextNode.id) {
-                                           isOnlyVia = true;
-                                           break;
-                                       }
-                                   }
-                               }
-                               return isOnlyVia;
-                           });
-
-                           step(nextNode, currPath, currRestrictions.concat(fromRestrictions), false);
-                       });
-                   }
-               }
-
-
-               // assumes path is alternating way-node-way of odd length
-               function pathToTurn(path) {
-                   if (path.length < 3) return;
-                   var fromWayId, fromNodeId, fromVertexId;
-                   var toWayId, toNodeId, toVertexId;
-                   var viaWayIds, viaNodeId, isUturn;
-
-                   fromWayId = path[0];
-                   toWayId = path[path.length - 1];
-
-                   if (path.length === 3 && fromWayId === toWayId) {  // u turn
-                       var way = vgraph.entity(fromWayId);
-                       if (way.__oneWay) return null;
-
-                       isUturn = true;
-                       viaNodeId = fromVertexId = toVertexId = path[1];
-                       fromNodeId = toNodeId = adjacentNode(fromWayId, viaNodeId);
-
-                   } else {
-                       isUturn = false;
-                       fromVertexId = path[1];
-                       fromNodeId = adjacentNode(fromWayId, fromVertexId);
-                       toVertexId = path[path.length - 2];
-                       toNodeId = adjacentNode(toWayId, toVertexId);
-
-                       if (path.length === 3) {
-                           viaNodeId = path[1];
-                       } else {
-                           viaWayIds = path.filter(function(entityId) { return entityId[0] === 'w'; });
-                           viaWayIds = viaWayIds.slice(1, viaWayIds.length - 1);  // remove first, last
-                       }
-                   }
-
-                   return {
-                       key:  path.join('_'),
-                       path: path,
-                       from: { node: fromNodeId, way:  fromWayId, vertex: fromVertexId },
-                       via:  { node: viaNodeId,  ways: viaWayIds },
-                       to:   { node: toNodeId,   way:  toWayId, vertex: toVertexId },
-                       u:    isUturn
-                   };
-
-
-                   function adjacentNode(wayId, affixId) {
-                       var nodes = vgraph.entity(wayId).nodes;
-                       return affixId === nodes[0] ? nodes[1] : nodes[nodes.length - 2];
-                   }
-               }
-
-           };
-
-           return intersection;
-       }
-
-
-       function osmInferRestriction(graph, turn, projection) {
-           var fromWay = graph.entity(turn.from.way);
-           var fromNode = graph.entity(turn.from.node);
-           var fromVertex = graph.entity(turn.from.vertex);
-           var toWay = graph.entity(turn.to.way);
-           var toNode = graph.entity(turn.to.node);
-           var toVertex = graph.entity(turn.to.vertex);
-
-           var fromOneWay = (fromWay.tags.oneway === 'yes');
-           var toOneWay = (toWay.tags.oneway === 'yes');
-           var angle = (geoAngle(fromVertex, fromNode, projection) -
-                       geoAngle(toVertex, toNode, projection)) * 180 / Math.PI;
-
-           while (angle < 0)
-               angle += 360;
-
-           if (fromNode === toNode)
-               return 'no_u_turn';
-           if ((angle < 23 || angle > 336) && fromOneWay && toOneWay)
-               return 'no_u_turn';   // wider tolerance for u-turn if both ways are oneway
-           if ((angle < 40 || angle > 319) && fromOneWay && toOneWay && turn.from.vertex !== turn.to.vertex)
-               return 'no_u_turn';   // even wider tolerance for u-turn if there is a via way (from !== to)
-           if (angle < 158)
-               return 'no_right_turn';
-           if (angle > 202)
-               return 'no_left_turn';
-
-           return 'no_straight_on';
-       }
-
-       function actionMergePolygon(ids, newRelationId) {
-
-           function groupEntities(graph) {
-               var entities = ids.map(function (id) { return graph.entity(id); });
-               var geometryGroups = utilArrayGroupBy(entities, function(entity) {
-                   if (entity.type === 'way' && entity.isClosed()) {
-                       return 'closedWay';
-                   } else if (entity.type === 'relation' && entity.isMultipolygon()) {
-                       return 'multipolygon';
-                   } else {
-                       return 'other';
-                   }
-               });
-
-               return Object.assign(
-                   { closedWay: [], multipolygon: [], other: [] },
-                   geometryGroups
-               );
-           }
-
-
-           var action = function(graph) {
-               var entities = groupEntities(graph);
-
-               // An array representing all the polygons that are part of the multipolygon.
-               //
-               // Each element is itself an array of objects with an id property, and has a
-               // locs property which is an array of the locations forming the polygon.
-               var polygons = entities.multipolygon.reduce(function(polygons, m) {
-                   return polygons.concat(osmJoinWays(m.members, graph));
-               }, []).concat(entities.closedWay.map(function(d) {
-                   var member = [{id: d.id}];
-                   member.nodes = graph.childNodes(d);
-                   return member;
-               }));
-
-               // contained is an array of arrays of boolean values,
-               // where contained[j][k] is true iff the jth way is
-               // contained by the kth way.
-               var contained = polygons.map(function(w, i) {
-                   return polygons.map(function(d, n) {
-                       if (i === n) return null;
-                       return geoPolygonContainsPolygon(
-                           d.nodes.map(function(n) { return n.loc; }),
-                           w.nodes.map(function(n) { return n.loc; })
-                       );
-                   });
-               });
-
-               // Sort all polygons as either outer or inner ways
-               var members = [];
-               var outer = true;
-
-               while (polygons.length) {
-                   extractUncontained(polygons);
-                   polygons = polygons.filter(isContained);
-                   contained = contained.filter(isContained).map(filterContained);
-               }
-
-               function isContained(d, i) {
-                   return contained[i].some(function(val) { return val; });
-               }
-
-               function filterContained(d) {
-                   return d.filter(isContained);
-               }
-
-               function extractUncontained(polygons) {
-                   polygons.forEach(function(d, i) {
-                       if (!isContained(d, i)) {
-                           d.forEach(function(member) {
-                               members.push({
-                                   type: 'way',
-                                   id: member.id,
-                                   role: outer ? 'outer' : 'inner'
-                               });
-                           });
-                       }
-                   });
-                   outer = !outer;
-               }
-
-               // Move all tags to one relation
-               var relation = entities.multipolygon[0] ||
-                   osmRelation({ id: newRelationId, tags: { type: 'multipolygon' }});
-
-               entities.multipolygon.slice(1).forEach(function(m) {
-                   relation = relation.mergeTags(m.tags);
-                   graph = graph.remove(m);
-               });
-
-               entities.closedWay.forEach(function(way) {
-                   function isThisOuter(m) {
-                       return m.id === way.id && m.role !== 'inner';
-                   }
-                   if (members.some(isThisOuter)) {
-                       relation = relation.mergeTags(way.tags);
-                       graph = graph.replace(way.update({ tags: {} }));
-                   }
-               });
-
-               return graph.replace(relation.update({
-                   members: members,
-                   tags: utilObjectOmit(relation.tags, ['area'])
-               }));
-           };
-
-
-           action.disabled = function(graph) {
-               var entities = groupEntities(graph);
-               if (entities.other.length > 0 ||
-                   entities.closedWay.length + entities.multipolygon.length < 2) {
-                   return 'not_eligible';
-               }
-               if (!entities.multipolygon.every(function(r) { return r.isComplete(graph); })) {
-                   return 'incomplete_relation';
-               }
-
-               if (!entities.multipolygon.length) {
-                   var sharedMultipolygons = [];
-                   entities.closedWay.forEach(function(way, i) {
-                       if (i === 0) {
-                           sharedMultipolygons = graph.parentMultipolygons(way);
-                       } else {
-                           sharedMultipolygons = utilArrayIntersection(sharedMultipolygons, graph.parentMultipolygons(way));
-                       }
-                   });
-                   sharedMultipolygons = sharedMultipolygons.filter(function(relation) {
-                       return relation.members.length === entities.closedWay.length;
-                   });
-                   if (sharedMultipolygons.length) {
-                       // don't create a new multipolygon if it'd be redundant
-                       return 'not_eligible';
-                   }
-               } else if (entities.closedWay.some(function(way) {
-                       return utilArrayIntersection(graph.parentMultipolygons(way), entities.multipolygon).length;
-                   })) {
-                   // don't add a way to a multipolygon again if it's already a member
-                   return 'not_eligible';
-               }
-           };
-
-
-           return action;
-       }
-
-       // do not edit .js files directly - edit src/index.jst
-
-
-
-       var fastDeepEqual = function equal(a, b) {
-         if (a === b) return true;
-
-         if (a && b && typeof a == 'object' && typeof b == 'object') {
-           if (a.constructor !== b.constructor) return false;
-
-           var length, i, keys;
-           if (Array.isArray(a)) {
-             length = a.length;
-             if (length != b.length) return false;
-             for (i = length; i-- !== 0;)
-               if (!equal(a[i], b[i])) return false;
-             return true;
-           }
-
-
-
-           if (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags;
-           if (a.valueOf !== Object.prototype.valueOf) return a.valueOf() === b.valueOf();
-           if (a.toString !== Object.prototype.toString) return a.toString() === b.toString();
-
-           keys = Object.keys(a);
-           length = keys.length;
-           if (length !== Object.keys(b).length) return false;
-
-           for (i = length; i-- !== 0;)
-             if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;
-
-           for (i = length; i-- !== 0;) {
-             var key = keys[i];
-
-             if (!equal(a[key], b[key])) return false;
-           }
-
-           return true;
-         }
-
-         // true if both NaN, false otherwise
-         return a!==a && b!==b;
-       };
-
-       // Text diff algorithm following Hunt and McIlroy 1976.
-       // J. W. Hunt and M. D. McIlroy, An algorithm for differential buffer
-       // comparison, Bell Telephone Laboratories CSTR #41 (1976)
-       // http://www.cs.dartmouth.edu/~doug/
-       // https://en.wikipedia.org/wiki/Longest_common_subsequence_problem
-       //
-       // Expects two arrays, finds longest common sequence
-       function LCS(buffer1, buffer2) {
-
-         let equivalenceClasses = {};
-         for (let j = 0; j < buffer2.length; j++) {
-           const item = buffer2[j];
-           if (equivalenceClasses[item]) {
-             equivalenceClasses[item].push(j);
-           } else {
-             equivalenceClasses[item] = [j];
-           }
-         }
-
-         const NULLRESULT = { buffer1index: -1, buffer2index: -1, chain: null };
-         let candidates = [NULLRESULT];
-
-         for (let i = 0; i < buffer1.length; i++) {
-           const item = buffer1[i];
-           const buffer2indices = equivalenceClasses[item] || [];
-           let r = 0;
-           let c = candidates[0];
-
-           for (let jx = 0; jx < buffer2indices.length; jx++) {
-             const j = buffer2indices[jx];
-
-             let s;
-             for (s = r; s < candidates.length; s++) {
-               if ((candidates[s].buffer2index < j) && ((s === candidates.length - 1) || (candidates[s + 1].buffer2index > j))) {
-                 break;
-               }
-             }
-
-             if (s < candidates.length) {
-               const newCandidate = { buffer1index: i, buffer2index: j, chain: candidates[s] };
-               if (r === candidates.length) {
-                 candidates.push(c);
-               } else {
-                 candidates[r] = c;
-               }
-               r = s + 1;
-               c = newCandidate;
-               if (r === candidates.length) {
-                 break; // no point in examining further (j)s
-               }
-             }
-           }
-
-           candidates[r] = c;
-         }
-
-         // At this point, we know the LCS: it's in the reverse of the
-         // linked-list through .chain of candidates[candidates.length - 1].
-
-         return candidates[candidates.length - 1];
-       }
-
-
-       // We apply the LCS to give a simple representation of the
-       // offsets and lengths of mismatched chunks in the input
-       // buffers. This is used by diff3MergeRegions.
-       function diffIndices(buffer1, buffer2) {
-         const lcs = LCS(buffer1, buffer2);
-         let result = [];
-         let tail1 = buffer1.length;
-         let tail2 = buffer2.length;
-
-         for (let candidate = lcs; candidate !== null; candidate = candidate.chain) {
-           const mismatchLength1 = tail1 - candidate.buffer1index - 1;
-           const mismatchLength2 = tail2 - candidate.buffer2index - 1;
-           tail1 = candidate.buffer1index;
-           tail2 = candidate.buffer2index;
-
-           if (mismatchLength1 || mismatchLength2) {
-             result.push({
-               buffer1: [tail1 + 1, mismatchLength1],
-               buffer1Content: buffer1.slice(tail1 + 1, tail1 + 1 + mismatchLength1),
-               buffer2: [tail2 + 1, mismatchLength2],
-               buffer2Content: buffer2.slice(tail2 + 1, tail2 + 1 + mismatchLength2)
-             });
-           }
-         }
-
-         result.reverse();
-         return result;
-       }
-
-
-       // Given three buffers, A, O, and B, where both A and B are
-       // independently derived from O, returns a fairly complicated
-       // internal representation of merge decisions it's taken. The
-       // interested reader may wish to consult
-       //
-       // Sanjeev Khanna, Keshav Kunal, and Benjamin C. Pierce.
-       // 'A Formal Investigation of ' In Arvind and Prasad,
-       // editors, Foundations of Software Technology and Theoretical
-       // Computer Science (FSTTCS), December 2007.
-       //
-       // (http://www.cis.upenn.edu/~bcpierce/papers/diff3-short.pdf)
-       //
-       function diff3MergeRegions(a, o, b) {
-
-         // "hunks" are array subsets where `a` or `b` are different from `o`
-         // https://www.gnu.org/software/diffutils/manual/html_node/diff3-Hunks.html
-         let hunks = [];
-         function addHunk(h, ab) {
-           hunks.push({
-             ab: ab,
-             oStart: h.buffer1[0],
-             oLength: h.buffer1[1],   // length of o to remove
-             abStart: h.buffer2[0],
-             abLength: h.buffer2[1]   // length of a/b to insert
-             // abContent: (ab === 'a' ? a : b).slice(h.buffer2[0], h.buffer2[0] + h.buffer2[1])
-           });
-         }
-
-         diffIndices(o, a).forEach(item => addHunk(item, 'a'));
-         diffIndices(o, b).forEach(item => addHunk(item, 'b'));
-         hunks.sort((x,y) => x.oStart - y.oStart);
-
-         let results = [];
-         let currOffset = 0;
-
-         function advanceTo(endOffset) {
-           if (endOffset > currOffset) {
-             results.push({
-               stable: true,
-               buffer: 'o',
-               bufferStart: currOffset,
-               bufferLength: endOffset - currOffset,
-               bufferContent: o.slice(currOffset, endOffset)
-             });
-             currOffset = endOffset;
-           }
-         }
-
-         while (hunks.length) {
-           let hunk = hunks.shift();
-           let regionStart = hunk.oStart;
-           let regionEnd = hunk.oStart + hunk.oLength;
-           let regionHunks = [hunk];
-           advanceTo(regionStart);
-
-           // Try to pull next overlapping hunk into this region
-           while (hunks.length) {
-             const nextHunk = hunks[0];
-             const nextHunkStart = nextHunk.oStart;
-             if (nextHunkStart > regionEnd) break;   // no overlap
-
-             regionEnd = Math.max(regionEnd, nextHunkStart + nextHunk.oLength);
-             regionHunks.push(hunks.shift());
-           }
-
-           if (regionHunks.length === 1) {
-             // Only one hunk touches this region, meaning that there is no conflict here.
-             // Either `a` or `b` is inserting into a region of `o` unchanged by the other.
-             if (hunk.abLength > 0) {
-               const buffer = (hunk.ab === 'a' ? a : b);
-               results.push({
-                 stable: true,
-                 buffer: hunk.ab,
-                 bufferStart: hunk.abStart,
-                 bufferLength: hunk.abLength,
-                 bufferContent: buffer.slice(hunk.abStart, hunk.abStart + hunk.abLength)
-               });
-             }
-           } else {
-             // A true a/b conflict. Determine the bounds involved from `a`, `o`, and `b`.
-             // Effectively merge all the `a` hunks into one giant hunk, then do the
-             // same for the `b` hunks; then, correct for skew in the regions of `o`
-             // that each side changed, and report appropriate spans for the three sides.
-             let bounds = {
-               a: [a.length, -1, o.length, -1],
-               b: [b.length, -1, o.length, -1]
-             };
-             while (regionHunks.length) {
-               hunk = regionHunks.shift();
-               const oStart = hunk.oStart;
-               const oEnd = oStart + hunk.oLength;
-               const abStart = hunk.abStart;
-               const abEnd = abStart + hunk.abLength;
-               let b = bounds[hunk.ab];
-               b[0] = Math.min(abStart, b[0]);
-               b[1] = Math.max(abEnd, b[1]);
-               b[2] = Math.min(oStart, b[2]);
-               b[3] = Math.max(oEnd, b[3]);
-             }
-
-             const aStart = bounds.a[0] + (regionStart - bounds.a[2]);
-             const aEnd = bounds.a[1] + (regionEnd - bounds.a[3]);
-             const bStart = bounds.b[0] + (regionStart - bounds.b[2]);
-             const bEnd = bounds.b[1] + (regionEnd - bounds.b[3]);
-
-             let result = {
-               stable: false,
-               aStart: aStart,
-               aLength: aEnd - aStart,
-               aContent: a.slice(aStart, aEnd),
-               oStart: regionStart,
-               oLength: regionEnd - regionStart,
-               oContent: o.slice(regionStart, regionEnd),
-               bStart: bStart,
-               bLength: bEnd - bStart,
-               bContent: b.slice(bStart, bEnd)
-             };
-             results.push(result);
-           }
-           currOffset = regionEnd;
-         }
-
-         advanceTo(o.length);
-
-         return results;
-       }
-
-
-       // Applies the output of diff3MergeRegions to actually
-       // construct the merged buffer; the returned result alternates
-       // between 'ok' and 'conflict' blocks.
-       // A "false conflict" is where `a` and `b` both change the same from `o`
-       function diff3Merge(a, o, b, options) {
-         let defaults = {
-           excludeFalseConflicts: true,
-           stringSeparator: /\s+/
-         };
-         options = Object.assign(defaults, options);
-
-         const aString = (typeof a === 'string');
-         const oString = (typeof o === 'string');
-         const bString = (typeof b === 'string');
-
-         if (aString) a = a.split(options.stringSeparator);
-         if (oString) o = o.split(options.stringSeparator);
-         if (bString) b = b.split(options.stringSeparator);
+       function hex$2(value) {
+         value = Math.max(0, Math.min(255, Math.round(value) || 0));
+         return (value < 16 ? "0" : "") + value.toString(16);
+       }
 
-         let results = [];
-         const regions = diff3MergeRegions(a, o, b);
+       function hsla(h, s, l, a) {
+         if (a <= 0) h = s = l = NaN;else if (l <= 0 || l >= 1) h = s = NaN;else if (s <= 0) h = NaN;
+         return new Hsl(h, s, l, a);
+       }
 
-         let okBuffer = [];
-         function flushOk() {
-           if (okBuffer.length) {
-             results.push({ ok: okBuffer });
-           }
-           okBuffer = [];
-         }
+       function hslConvert(o) {
+         if (o instanceof Hsl) return new Hsl(o.h, o.s, o.l, o.opacity);
+         if (!(o instanceof Color)) o = color(o);
+         if (!o) return new Hsl();
+         if (o instanceof Hsl) return o;
+         o = o.rgb();
+         var r = o.r / 255,
+             g = o.g / 255,
+             b = o.b / 255,
+             min = Math.min(r, g, b),
+             max = Math.max(r, g, b),
+             h = NaN,
+             s = max - min,
+             l = (max + min) / 2;
 
-         function isFalseConflict(a, b) {
-           if (a.length !== b.length) return false;
-           for (let i = 0; i < a.length; i++) {
-             if (a[i] !== b[i]) return false;
-           }
-           return true;
+         if (s) {
+           if (r === max) h = (g - b) / s + (g < b) * 6;else if (g === max) h = (b - r) / s + 2;else h = (r - g) / s + 4;
+           s /= l < 0.5 ? max + min : 2 - max - min;
+           h *= 60;
+         } else {
+           s = l > 0 && l < 1 ? 0 : h;
          }
 
-         regions.forEach(region =>  {
-           if (region.stable) {
-             okBuffer.push(...region.bufferContent);
-           } else {
-             if (options.excludeFalseConflicts && isFalseConflict(region.aContent, region.bContent)) {
-               okBuffer.push(...region.aContent);
-             } else {
-               flushOk();
-               results.push({
-                 conflict: {
-                   a: region.aContent,
-                   aIndex: region.aStart,
-                   o: region.oContent,
-                   oIndex: region.oStart,
-                   b: region.bContent,
-                   bIndex: region.bStart
-                 }
-               });
-             }
-           }
-         });
-
-         flushOk();
-         return results;
+         return new Hsl(h, s, l, o.opacity);
+       }
+       function hsl(h, s, l, opacity) {
+         return arguments.length === 1 ? hslConvert(h) : new Hsl(h, s, l, opacity == null ? 1 : opacity);
        }
 
-       function actionMergeRemoteChanges(id, localGraph, remoteGraph, discardTags, formatUser) {
-           discardTags = discardTags || {};
-           var _option = 'safe';  // 'safe', 'force_local', 'force_remote'
-           var _conflicts = [];
-
-
-           function user(d) {
-               return (typeof formatUser === 'function') ? formatUser(d) : d;
-           }
+       function Hsl(h, s, l, opacity) {
+         this.h = +h;
+         this.s = +s;
+         this.l = +l;
+         this.opacity = +opacity;
+       }
 
+       define(Hsl, hsl, extend(Color, {
+         brighter: function brighter(k) {
+           k = k == null ? _brighter : Math.pow(_brighter, k);
+           return new Hsl(this.h, this.s, this.l * k, this.opacity);
+         },
+         darker: function darker(k) {
+           k = k == null ? _darker : Math.pow(_darker, k);
+           return new Hsl(this.h, this.s, this.l * k, this.opacity);
+         },
+         rgb: function rgb() {
+           var h = this.h % 360 + (this.h < 0) * 360,
+               s = isNaN(h) || isNaN(this.s) ? 0 : this.s,
+               l = this.l,
+               m2 = l + (l < 0.5 ? l : 1 - l) * s,
+               m1 = 2 * l - m2;
+           return new Rgb(hsl2rgb(h >= 240 ? h - 240 : h + 120, m1, m2), hsl2rgb(h, m1, m2), hsl2rgb(h < 120 ? h + 240 : h - 120, m1, m2), this.opacity);
+         },
+         displayable: function displayable() {
+           return (0 <= this.s && this.s <= 1 || isNaN(this.s)) && 0 <= this.l && this.l <= 1 && 0 <= this.opacity && this.opacity <= 1;
+         },
+         formatHsl: function formatHsl() {
+           var a = this.opacity;
+           a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));
+           return (a === 1 ? "hsl(" : "hsla(") + (this.h || 0) + ", " + (this.s || 0) * 100 + "%, " + (this.l || 0) * 100 + "%" + (a === 1 ? ")" : ", " + a + ")");
+         }
+       }));
+       /* From FvD 13.37, CSS Color Module Level 3 */
 
-           function mergeLocation(remote, target) {
-               function pointEqual(a, b) {
-                   var epsilon = 1e-6;
-                   return (Math.abs(a[0] - b[0]) < epsilon) && (Math.abs(a[1] - b[1]) < epsilon);
-               }
+       function hsl2rgb(h, m1, m2) {
+         return (h < 60 ? m1 + (m2 - m1) * h / 60 : h < 180 ? m2 : h < 240 ? m1 + (m2 - m1) * (240 - h) / 60 : m1) * 255;
+       }
 
-               if (_option === 'force_local' || pointEqual(target.loc, remote.loc)) {
-                   return target;
-               }
-               if (_option === 'force_remote') {
-                   return target.update({loc: remote.loc});
-               }
+       var constant$2 = (function (x) {
+         return function () {
+           return x;
+         };
+       });
 
-               _conflicts.push(_t('merge_remote_changes.conflict.location', { user: user(remote.user) }));
-               return target;
-           }
+       function linear(a, d) {
+         return function (t) {
+           return a + t * d;
+         };
+       }
 
+       function exponential(a, b, y) {
+         return a = Math.pow(a, y), b = Math.pow(b, y) - a, y = 1 / y, function (t) {
+           return Math.pow(a + t * b, y);
+         };
+       }
+       function gamma(y) {
+         return (y = +y) === 1 ? nogamma : function (a, b) {
+           return b - a ? exponential(a, b, y) : constant$2(isNaN(a) ? b : a);
+         };
+       }
+       function nogamma(a, b) {
+         var d = b - a;
+         return d ? linear(a, d) : constant$2(isNaN(a) ? b : a);
+       }
 
-           function mergeNodes(base, remote, target) {
-               if (_option === 'force_local' || fastDeepEqual(target.nodes, remote.nodes)) {
-                   return target;
-               }
-               if (_option === 'force_remote') {
-                   return target.update({nodes: remote.nodes});
-               }
+       var d3_interpolateRgb = (function rgbGamma(y) {
+         var color = gamma(y);
 
-               var ccount = _conflicts.length;
-               var o = base.nodes || [];
-               var a = target.nodes || [];
-               var b = remote.nodes || [];
-               var nodes = [];
-               var hunks = diff3Merge(a, o, b, { excludeFalseConflicts: true });
+         function rgb$1(start, end) {
+           var r = color((start = rgb(start)).r, (end = rgb(end)).r),
+               g = color(start.g, end.g),
+               b = color(start.b, end.b),
+               opacity = nogamma(start.opacity, end.opacity);
+           return function (t) {
+             start.r = r(t);
+             start.g = g(t);
+             start.b = b(t);
+             start.opacity = opacity(t);
+             return start + "";
+           };
+         }
 
-               for (var i = 0; i < hunks.length; i++) {
-                   var hunk = hunks[i];
-                   if (hunk.ok) {
-                       nodes.push.apply(nodes, hunk.ok);
-                   } else {
-                       // for all conflicts, we can assume c.a !== c.b
-                       // because `diff3Merge` called with `true` option to exclude false conflicts..
-                       var c = hunk.conflict;
-                       if (fastDeepEqual(c.o, c.a)) {  // only changed remotely
-                           nodes.push.apply(nodes, c.b);
-                       } else if (fastDeepEqual(c.o, c.b)) {  // only changed locally
-                           nodes.push.apply(nodes, c.a);
-                       } else {       // changed both locally and remotely
-                           _conflicts.push(_t('merge_remote_changes.conflict.nodelist', { user: user(remote.user) }));
-                           break;
-                       }
-                   }
-               }
+         rgb$1.gamma = rgbGamma;
+         return rgb$1;
+       })(1);
 
-               return (_conflicts.length === ccount) ? target.update({nodes: nodes}) : target;
+       function numberArray (a, b) {
+         if (!b) b = [];
+         var n = a ? Math.min(b.length, a.length) : 0,
+             c = b.slice(),
+             i;
+         return function (t) {
+           for (i = 0; i < n; ++i) {
+             c[i] = a[i] * (1 - t) + b[i] * t;
            }
 
+           return c;
+         };
+       }
+       function isNumberArray(x) {
+         return ArrayBuffer.isView(x) && !(x instanceof DataView);
+       }
 
-           function mergeChildren(targetWay, children, updates, graph) {
-               function isUsed(node, targetWay) {
-                   var hasInterestingParent = graph.parentWays(node)
-                       .some(function(way) { return way.id !== targetWay.id; });
-
-                   return node.hasInterestingTags() ||
-                       hasInterestingParent ||
-                       graph.parentRelations(node).length > 0;
-               }
-
-               var ccount = _conflicts.length;
-
-               for (var i = 0; i < children.length; i++) {
-                   var id = children[i];
-                   var node = graph.hasEntity(id);
-
-                   // remove unused childNodes..
-                   if (targetWay.nodes.indexOf(id) === -1) {
-                       if (node && !isUsed(node, targetWay)) {
-                           updates.removeIds.push(id);
-                       }
-                       continue;
-                   }
-
-                   // restore used childNodes..
-                   var local = localGraph.hasEntity(id);
-                   var remote = remoteGraph.hasEntity(id);
-                   var target;
-
-                   if (_option === 'force_remote' && remote && remote.visible) {
-                       updates.replacements.push(remote);
+       function genericArray(a, b) {
+         var nb = b ? b.length : 0,
+             na = a ? Math.min(nb, a.length) : 0,
+             x = new Array(na),
+             c = new Array(nb),
+             i;
 
-                   } else if (_option === 'force_local' && local) {
-                       target = osmEntity(local);
-                       if (remote) {
-                           target = target.update({ version: remote.version });
-                       }
-                       updates.replacements.push(target);
-
-                   } else if (_option === 'safe' && local && remote && local.version !== remote.version) {
-                       target = osmEntity(local, { version: remote.version });
-                       if (remote.visible) {
-                           target = mergeLocation(remote, target);
-                       } else {
-                           _conflicts.push(_t('merge_remote_changes.conflict.deleted', { user: user(remote.user) }));
-                       }
+         for (i = 0; i < na; ++i) {
+           x[i] = interpolate(a[i], b[i]);
+         }
 
-                       if (_conflicts.length !== ccount) break;
-                       updates.replacements.push(target);
-                   }
-               }
+         for (; i < nb; ++i) {
+           c[i] = b[i];
+         }
 
-               return targetWay;
+         return function (t) {
+           for (i = 0; i < na; ++i) {
+             c[i] = x[i](t);
            }
 
+           return c;
+         };
+       }
 
-           function updateChildren(updates, graph) {
-               for (var i = 0; i < updates.replacements.length; i++) {
-                   graph = graph.replace(updates.replacements[i]);
-               }
-               if (updates.removeIds.length) {
-                   graph = actionDeleteMultiple(updates.removeIds)(graph);
-               }
-               return graph;
-           }
+       function date (a, b) {
+         var d = new Date();
+         return a = +a, b = +b, function (t) {
+           return d.setTime(a * (1 - t) + b * t), d;
+         };
+       }
 
+       function d3_interpolateNumber (a, b) {
+         return a = +a, b = +b, function (t) {
+           return a * (1 - t) + b * t;
+         };
+       }
 
-           function mergeMembers(remote, target) {
-               if (_option === 'force_local' || fastDeepEqual(target.members, remote.members)) {
-                   return target;
-               }
-               if (_option === 'force_remote') {
-                   return target.update({members: remote.members});
-               }
+       function object (a, b) {
+         var i = {},
+             c = {},
+             k;
+         if (a === null || _typeof(a) !== "object") a = {};
+         if (b === null || _typeof(b) !== "object") b = {};
 
-               _conflicts.push(_t('merge_remote_changes.conflict.memberlist', { user: user(remote.user) }));
-               return target;
+         for (k in b) {
+           if (k in a) {
+             i[k] = interpolate(a[k], b[k]);
+           } else {
+             c[k] = b[k];
            }
+         }
 
-
-           function mergeTags(base, remote, target) {
-               if (_option === 'force_local' || fastDeepEqual(target.tags, remote.tags)) {
-                   return target;
-               }
-               if (_option === 'force_remote') {
-                   return target.update({tags: remote.tags});
-               }
-
-               var ccount = _conflicts.length;
-               var o = base.tags || {};
-               var a = target.tags || {};
-               var b = remote.tags || {};
-               var keys = utilArrayUnion(utilArrayUnion(Object.keys(o), Object.keys(a)), Object.keys(b))
-                   .filter(function(k) { return !discardTags[k]; });
-               var tags = Object.assign({}, a);   // shallow copy
-               var changed = false;
-
-               for (var i = 0; i < keys.length; i++) {
-                   var k = keys[i];
-
-                   if (o[k] !== b[k] && a[k] !== b[k]) {    // changed remotely..
-                       if (o[k] !== a[k]) {      // changed locally..
-                           _conflicts.push(_t('merge_remote_changes.conflict.tags',
-                               { tag: k, local: a[k], remote: b[k], user: user(remote.user) }));
-
-                       } else {                  // unchanged locally, accept remote change..
-                           if (b.hasOwnProperty(k)) {
-                               tags[k] = b[k];
-                           } else {
-                               delete tags[k];
-                           }
-                           changed = true;
-                       }
-                   }
-               }
-
-               return (changed && _conflicts.length === ccount) ? target.update({tags: tags}) : target;
+         return function (t) {
+           for (k in i) {
+             c[k] = i[k](t);
            }
 
-
-           //  `graph.base()` is the common ancestor of the two graphs.
-           //  `localGraph` contains user's edits up to saving
-           //  `remoteGraph` contains remote edits to modified nodes
-           //  `graph` must be a descendent of `localGraph` and may include
-           //      some conflict resolution actions performed on it.
-           //
-           //                  --- ... --- `localGraph` -- ... -- `graph`
-           //                 /
-           //  `graph.base()` --- ... --- `remoteGraph`
-           //
-           var action = function(graph) {
-               var updates = { replacements: [], removeIds: [] };
-               var base = graph.base().entities[id];
-               var local = localGraph.entity(id);
-               var remote = remoteGraph.entity(id);
-               var target = osmEntity(local, { version: remote.version });
-
-               // delete/undelete
-               if (!remote.visible) {
-                   if (_option === 'force_remote') {
-                       return actionDeleteMultiple([id])(graph);
-
-                   } else if (_option === 'force_local') {
-                       if (target.type === 'way') {
-                           target = mergeChildren(target, utilArrayUniq(local.nodes), updates, graph);
-                           graph = updateChildren(updates, graph);
-                       }
-                       return graph.replace(target);
-
-                   } else {
-                       _conflicts.push(_t('merge_remote_changes.conflict.deleted', { user: user(remote.user) }));
-                       return graph;  // do nothing
-                   }
-               }
-
-               // merge
-               if (target.type === 'node') {
-                   target = mergeLocation(remote, target);
-
-               } else if (target.type === 'way') {
-                   // pull in any child nodes that may not be present locally..
-                   graph.rebase(remoteGraph.childNodes(remote), [graph], false);
-                   target = mergeNodes(base, remote, target);
-                   target = mergeChildren(target, utilArrayUnion(local.nodes, remote.nodes), updates, graph);
-
-               } else if (target.type === 'relation') {
-                   target = mergeMembers(remote, target);
-               }
-
-               target = mergeTags(base, remote, target);
-
-               if (!_conflicts.length) {
-                   graph = updateChildren(updates, graph).replace(target);
-               }
-
-               return graph;
-           };
-
-
-           action.withOption = function(opt) {
-               _option = opt;
-               return action;
-           };
-
-
-           action.conflicts = function() {
-               return _conflicts;
-           };
-
-
-           return action;
+           return c;
+         };
        }
 
-       // https://github.com/openstreetmap/josm/blob/mirror/src/org/openstreetmap/josm/command/MoveCommand.java
-       // https://github.com/openstreetmap/potlatch2/blob/master/net/systemeD/halcyon/connection/actions/MoveNodeAction.as
-       function actionMove(moveIDs, tryDelta, projection, cache) {
-           var _delta = tryDelta;
-
-           function setupCache(graph) {
-               function canMove(nodeID) {
-                   // Allow movement of any node that is in the selectedIDs list..
-                   if (moveIDs.indexOf(nodeID) !== -1) return true;
-
-                   // Allow movement of a vertex where 2 ways meet..
-                   var parents = graph.parentWays(graph.entity(nodeID));
-                   if (parents.length < 3) return true;
-
-                   // Restrict movement of a vertex where >2 ways meet, unless all parentWays are moving too..
-                   var parentsMoving = parents.every(function(way) { return cache.moving[way.id]; });
-                   if (!parentsMoving) delete cache.moving[nodeID];
-
-                   return parentsMoving;
-               }
-
-               function cacheEntities(ids) {
-                   for (var i = 0; i < ids.length; i++) {
-                       var id = ids[i];
-                       if (cache.moving[id]) continue;
-                       cache.moving[id] = true;
-
-                       var entity = graph.hasEntity(id);
-                       if (!entity) continue;
-
-                       if (entity.type === 'node') {
-                           cache.nodes.push(id);
-                           cache.startLoc[id] = entity.loc;
-                       } else if (entity.type === 'way') {
-                           cache.ways.push(id);
-                           cacheEntities(entity.nodes);
-                       } else {
-                           cacheEntities(entity.members.map(function(member) {
-                               return member.id;
-                           }));
-                       }
-                   }
-               }
-
-               function cacheIntersections(ids) {
-                   function isEndpoint(way, id) {
-                       return !way.isClosed() && !!way.affix(id);
-                   }
+       var reA = /[-+]?(?:\d+\.?\d*|\.?\d+)(?:[eE][-+]?\d+)?/g,
+           reB = new RegExp(reA.source, "g");
 
-                   for (var i = 0; i < ids.length; i++) {
-                       var id = ids[i];
-
-                       // consider only intersections with 1 moved and 1 unmoved way.
-                       var childNodes = graph.childNodes(graph.entity(id));
-                       for (var j = 0; j < childNodes.length; j++) {
-                           var node = childNodes[j];
-                           var parents = graph.parentWays(node);
-                           if (parents.length !== 2) continue;
-
-                           var moved = graph.entity(id);
-                           var unmoved = null;
-                           for (var k = 0; k < parents.length; k++) {
-                               var way = parents[k];
-                               if (!cache.moving[way.id]) {
-                                   unmoved = way;
-                                   break;
-                               }
-                           }
-                           if (!unmoved) continue;
-
-                           // exclude ways that are overly connected..
-                           if (utilArrayIntersection(moved.nodes, unmoved.nodes).length > 2) continue;
-                           if (moved.isArea() || unmoved.isArea()) continue;
-
-                           cache.intersections.push({
-                               nodeId: node.id,
-                               movedId: moved.id,
-                               unmovedId: unmoved.id,
-                               movedIsEP: isEndpoint(moved, node.id),
-                               unmovedIsEP: isEndpoint(unmoved, node.id)
-                           });
-                       }
-                   }
-               }
+       function zero(b) {
+         return function () {
+           return b;
+         };
+       }
 
+       function one(b) {
+         return function (t) {
+           return b(t) + "";
+         };
+       }
 
-               if (!cache) {
-                   cache = {};
-               }
-               if (!cache.ok) {
-                   cache.moving = {};
-                   cache.intersections = [];
-                   cache.replacedVertex = {};
-                   cache.startLoc = {};
-                   cache.nodes = [];
-                   cache.ways = [];
+       function interpolateString (a, b) {
+         var bi = reA.lastIndex = reB.lastIndex = 0,
+             // scan index for next number in b
+         am,
+             // current match in a
+         bm,
+             // current match in b
+         bs,
+             // string preceding current number in b, if any
+         i = -1,
+             // index in s
+         s = [],
+             // string constants and placeholders
+         q = []; // number interpolators
+         // Coerce inputs to strings.
 
-                   cacheEntities(moveIDs);
-                   cacheIntersections(cache.ways);
-                   cache.nodes = cache.nodes.filter(canMove);
+         a = a + "", b = b + ""; // Interpolate pairs of numbers in a & b.
 
-                   cache.ok = true;
-               }
+         while ((am = reA.exec(a)) && (bm = reB.exec(b))) {
+           if ((bs = bm.index) > bi) {
+             // a string precedes the next number in b
+             bs = b.slice(bi, bs);
+             if (s[i]) s[i] += bs; // coalesce with previous string
+             else s[++i] = bs;
            }
 
+           if ((am = am[0]) === (bm = bm[0])) {
+             // numbers in a & b match
+             if (s[i]) s[i] += bm; // coalesce with previous string
+             else s[++i] = bm;
+           } else {
+             // interpolate non-matching numbers
+             s[++i] = null;
+             q.push({
+               i: i,
+               x: d3_interpolateNumber(am, bm)
+             });
+           }
 
-           // Place a vertex where the moved vertex used to be, to preserve way shape..
-           //
-           //  Start:
-           //      b ---- e
-           //     / \
-           //    /   \
-           //   /     \
-           //  a       c
-           //
-           //      *               node '*' added to preserve shape
-           //     / \
-           //    /   b ---- e      way `b,e` moved here:
-           //   /     \
-           //  a       c
-           //
-           //
-           function replaceMovedVertex(nodeId, wayId, graph, delta) {
-               var way = graph.entity(wayId);
-               var moved = graph.entity(nodeId);
-               var movedIndex = way.nodes.indexOf(nodeId);
-               var len, prevIndex, nextIndex;
-
-               if (way.isClosed()) {
-                   len = way.nodes.length - 1;
-                   prevIndex = (movedIndex + len - 1) % len;
-                   nextIndex = (movedIndex + len + 1) % len;
-               } else {
-                   len = way.nodes.length;
-                   prevIndex = movedIndex - 1;
-                   nextIndex = movedIndex + 1;
-               }
-
-               var prev = graph.hasEntity(way.nodes[prevIndex]);
-               var next = graph.hasEntity(way.nodes[nextIndex]);
-
-               // Don't add orig vertex at endpoint..
-               if (!prev || !next) return graph;
-
-               var key = wayId + '_' + nodeId;
-               var orig = cache.replacedVertex[key];
-               if (!orig) {
-                   orig = osmNode();
-                   cache.replacedVertex[key] = orig;
-                   cache.startLoc[orig.id] = cache.startLoc[nodeId];
-               }
-
-               var start, end;
-               if (delta) {
-                   start = projection(cache.startLoc[nodeId]);
-                   end = projection.invert(geoVecAdd(start, delta));
-               } else {
-                   end = cache.startLoc[nodeId];
-               }
-               orig = orig.move(end);
-
-               var angle = Math.abs(geoAngle(orig, prev, projection) -
-                       geoAngle(orig, next, projection)) * 180 / Math.PI;
+           bi = reB.lastIndex;
+         } // Add remains of b.
 
-               // Don't add orig vertex if it would just make a straight line..
-               if (angle > 175 && angle < 185) return graph;
 
-               // moving forward or backward along way?
-               var p1 = [prev.loc, orig.loc, moved.loc, next.loc].map(projection);
-               var p2 = [prev.loc, moved.loc, orig.loc, next.loc].map(projection);
-               var d1 = geoPathLength(p1);
-               var d2 = geoPathLength(p2);
-               var insertAt = (d1 <= d2) ? movedIndex : nextIndex;
+         if (bi < b.length) {
+           bs = b.slice(bi);
+           if (s[i]) s[i] += bs; // coalesce with previous string
+           else s[++i] = bs;
+         } // Special optimization for only a single match.
+         // Otherwise, interpolate each of the numbers and rejoin the string.
 
-               // moving around closed loop?
-               if (way.isClosed() && insertAt === 0) insertAt = len;
 
-               way = way.addNode(orig.id, insertAt);
-               return graph.replace(orig).replace(way);
+         return s.length < 2 ? q[0] ? one(q[0].x) : zero(b) : (b = q.length, function (t) {
+           for (var i = 0, o; i < b; ++i) {
+             s[(o = q[i]).i] = o.x(t);
            }
 
+           return s.join("");
+         });
+       }
 
-           // Remove duplicate vertex that might have been added by
-           // replaceMovedVertex.  This is done after the unzorro checks.
-           function removeDuplicateVertices(wayId, graph) {
-               var way = graph.entity(wayId);
-               var epsilon = 1e-6;
-               var prev, curr;
-
-               function isInteresting(node, graph) {
-                   return graph.parentWays(node).length > 1 ||
-                       graph.parentRelations(node).length ||
-                       node.hasInterestingTags();
-               }
-
-               for (var i = 0; i < way.nodes.length; i++) {
-                   curr = graph.entity(way.nodes[i]);
-
-                   if (prev && curr && geoVecEqual(prev.loc, curr.loc, epsilon)) {
-                       if (!isInteresting(prev, graph)) {
-                           way = way.removeNode(prev.id);
-                           graph = graph.replace(way).remove(prev);
-                       } else if (!isInteresting(curr, graph)) {
-                           way = way.removeNode(curr.id);
-                           graph = graph.replace(way).remove(curr);
-                       }
-                   }
+       function interpolate (a, b) {
+         var t = _typeof(b),
+             c;
 
-                   prev = curr;
-               }
+         return b == null || t === "boolean" ? constant$2(b) : (t === "number" ? d3_interpolateNumber : t === "string" ? (c = color(b)) ? (b = c, d3_interpolateRgb) : interpolateString : b instanceof color ? d3_interpolateRgb : b instanceof Date ? date : isNumberArray(b) ? numberArray : Array.isArray(b) ? genericArray : typeof b.valueOf !== "function" && typeof b.toString !== "function" || isNaN(b) ? object : d3_interpolateNumber)(a, b);
+       }
 
-               return graph;
-           }
+       function interpolateRound (a, b) {
+         return a = +a, b = +b, function (t) {
+           return Math.round(a * (1 - t) + b * t);
+         };
+       }
 
+       var degrees$1 = 180 / Math.PI;
+       var identity$1 = {
+         translateX: 0,
+         translateY: 0,
+         rotate: 0,
+         skewX: 0,
+         scaleX: 1,
+         scaleY: 1
+       };
+       function decompose (a, b, c, d, e, f) {
+         var scaleX, scaleY, skewX;
+         if (scaleX = Math.sqrt(a * a + b * b)) a /= scaleX, b /= scaleX;
+         if (skewX = a * c + b * d) c -= a * skewX, d -= b * skewX;
+         if (scaleY = Math.sqrt(c * c + d * d)) c /= scaleY, d /= scaleY, skewX /= scaleY;
+         if (a * d < b * c) a = -a, b = -b, skewX = -skewX, scaleX = -scaleX;
+         return {
+           translateX: e,
+           translateY: f,
+           rotate: Math.atan2(b, a) * degrees$1,
+           skewX: Math.atan(skewX) * degrees$1,
+           scaleX: scaleX,
+           scaleY: scaleY
+         };
+       }
 
-           // Reorder nodes around intersections that have moved..
-           //
-           //  Start:                way1.nodes: b,e         (moving)
-           //  a - b - c ----- d     way2.nodes: a,b,c,d     (static)
-           //      |                 vertex: b
-           //      e                 isEP1: true,  isEP2, false
-           //
-           //  way1 `b,e` moved here:
-           //  a ----- c = b - d
-           //              |
-           //              e
-           //
-           //  reorder nodes         way1.nodes: b,e
-           //  a ----- c - b - d     way2.nodes: a,c,b,d
-           //              |
-           //              e
-           //
-           function unZorroIntersection(intersection, graph) {
-               var vertex = graph.entity(intersection.nodeId);
-               var way1 = graph.entity(intersection.movedId);
-               var way2 = graph.entity(intersection.unmovedId);
-               var isEP1 = intersection.movedIsEP;
-               var isEP2 = intersection.unmovedIsEP;
-
-               // don't move the vertex if it is the endpoint of both ways.
-               if (isEP1 && isEP2) return graph;
-
-               var nodes1 = graph.childNodes(way1).filter(function(n) { return n !== vertex; });
-               var nodes2 = graph.childNodes(way2).filter(function(n) { return n !== vertex; });
-
-               if (way1.isClosed() && way1.first() === vertex.id) nodes1.push(nodes1[0]);
-               if (way2.isClosed() && way2.first() === vertex.id) nodes2.push(nodes2[0]);
-
-               var edge1 = !isEP1 && geoChooseEdge(nodes1, projection(vertex.loc), projection);
-               var edge2 = !isEP2 && geoChooseEdge(nodes2, projection(vertex.loc), projection);
-               var loc;
-
-               // snap vertex to nearest edge (or some point between them)..
-               if (!isEP1 && !isEP2) {
-                   var epsilon = 1e-6, maxIter = 10;
-                   for (var i = 0; i < maxIter; i++) {
-                       loc = geoVecInterp(edge1.loc, edge2.loc, 0.5);
-                       edge1 = geoChooseEdge(nodes1, projection(loc), projection);
-                       edge2 = geoChooseEdge(nodes2, projection(loc), projection);
-                       if (Math.abs(edge1.distance - edge2.distance) < epsilon) break;
-                   }
-               } else if (!isEP1) {
-                   loc = edge1.loc;
-               } else {
-                   loc = edge2.loc;
-               }
+       var svgNode;
+       /* eslint-disable no-undef */
 
-               graph = graph.replace(vertex.move(loc));
+       function parseCss(value) {
+         var m = new (typeof DOMMatrix === "function" ? DOMMatrix : WebKitCSSMatrix)(value + "");
+         return m.isIdentity ? identity$1 : decompose(m.a, m.b, m.c, m.d, m.e, m.f);
+       }
+       function parseSvg(value) {
+         if (value == null) return identity$1;
+         if (!svgNode) svgNode = document.createElementNS("http://www.w3.org/2000/svg", "g");
+         svgNode.setAttribute("transform", value);
+         if (!(value = svgNode.transform.baseVal.consolidate())) return identity$1;
+         value = value.matrix;
+         return decompose(value.a, value.b, value.c, value.d, value.e, value.f);
+       }
 
-               // if zorro happened, reorder nodes..
-               if (!isEP1 && edge1.index !== way1.nodes.indexOf(vertex.id)) {
-                   way1 = way1.removeNode(vertex.id).addNode(vertex.id, edge1.index);
-                   graph = graph.replace(way1);
-               }
-               if (!isEP2 && edge2.index !== way2.nodes.indexOf(vertex.id)) {
-                   way2 = way2.removeNode(vertex.id).addNode(vertex.id, edge2.index);
-                   graph = graph.replace(way2);
-               }
+       function interpolateTransform(parse, pxComma, pxParen, degParen) {
+         function pop(s) {
+           return s.length ? s.pop() + " " : "";
+         }
 
-               return graph;
+         function translate(xa, ya, xb, yb, s, q) {
+           if (xa !== xb || ya !== yb) {
+             var i = s.push("translate(", null, pxComma, null, pxParen);
+             q.push({
+               i: i - 4,
+               x: d3_interpolateNumber(xa, xb)
+             }, {
+               i: i - 2,
+               x: d3_interpolateNumber(ya, yb)
+             });
+           } else if (xb || yb) {
+             s.push("translate(" + xb + pxComma + yb + pxParen);
            }
+         }
 
+         function rotate(a, b, s, q) {
+           if (a !== b) {
+             if (a - b > 180) b += 360;else if (b - a > 180) a += 360; // shortest path
 
-           function cleanupIntersections(graph) {
-               for (var i = 0; i < cache.intersections.length; i++) {
-                   var obj = cache.intersections[i];
-                   graph = replaceMovedVertex(obj.nodeId, obj.movedId, graph, _delta);
-                   graph = replaceMovedVertex(obj.nodeId, obj.unmovedId, graph, null);
-                   graph = unZorroIntersection(obj, graph);
-                   graph = removeDuplicateVertices(obj.movedId, graph);
-                   graph = removeDuplicateVertices(obj.unmovedId, graph);
-               }
-
-               return graph;
+             q.push({
+               i: s.push(pop(s) + "rotate(", null, degParen) - 2,
+               x: d3_interpolateNumber(a, b)
+             });
+           } else if (b) {
+             s.push(pop(s) + "rotate(" + b + degParen);
            }
+         }
 
-
-           // check if moving way endpoint can cross an unmoved way, if so limit delta..
-           function limitDelta(graph) {
-               function moveNode(loc) {
-                   return geoVecAdd(projection(loc), _delta);
-               }
-
-               for (var i = 0; i < cache.intersections.length; i++) {
-                   var obj = cache.intersections[i];
-
-                   // Don't limit movement if this is vertex joins 2 endpoints..
-                   if (obj.movedIsEP && obj.unmovedIsEP) continue;
-                   // Don't limit movement if this vertex is not an endpoint anyway..
-                   if (!obj.movedIsEP) continue;
-
-                   var node = graph.entity(obj.nodeId);
-                   var start = projection(node.loc);
-                   var end = geoVecAdd(start, _delta);
-                   var movedNodes = graph.childNodes(graph.entity(obj.movedId));
-                   var movedPath = movedNodes.map(function(n) { return moveNode(n.loc); });
-                   var unmovedNodes = graph.childNodes(graph.entity(obj.unmovedId));
-                   var unmovedPath = unmovedNodes.map(function(n) { return projection(n.loc); });
-                   var hits = geoPathIntersections(movedPath, unmovedPath);
-
-                   for (var j = 0; i < hits.length; i++) {
-                       if (geoVecEqual(hits[j], end)) continue;
-                       var edge = geoChooseEdge(unmovedNodes, end, projection);
-                       _delta = geoVecSubtract(projection(edge.loc), start);
-                   }
-               }
+         function skewX(a, b, s, q) {
+           if (a !== b) {
+             q.push({
+               i: s.push(pop(s) + "skewX(", null, degParen) - 2,
+               x: d3_interpolateNumber(a, b)
+             });
+           } else if (b) {
+             s.push(pop(s) + "skewX(" + b + degParen);
            }
+         }
 
+         function scale(xa, ya, xb, yb, s, q) {
+           if (xa !== xb || ya !== yb) {
+             var i = s.push(pop(s) + "scale(", null, ",", null, ")");
+             q.push({
+               i: i - 4,
+               x: d3_interpolateNumber(xa, xb)
+             }, {
+               i: i - 2,
+               x: d3_interpolateNumber(ya, yb)
+             });
+           } else if (xb !== 1 || yb !== 1) {
+             s.push(pop(s) + "scale(" + xb + "," + yb + ")");
+           }
+         }
 
-           var action = function(graph) {
-               if (_delta[0] === 0 && _delta[1] === 0) return graph;
-
-               setupCache(graph);
-
-               if (cache.intersections.length) {
-                   limitDelta(graph);
-               }
-
-               for (var i = 0; i < cache.nodes.length; i++) {
-                   var node = graph.entity(cache.nodes[i]);
-                   var start = projection(node.loc);
-                   var end = geoVecAdd(start, _delta);
-                   graph = graph.replace(node.move(projection.invert(end)));
-               }
-
-               if (cache.intersections.length) {
-                   graph = cleanupIntersections(graph);
-               }
-
-               return graph;
-           };
-
+         return function (a, b) {
+           var s = [],
+               // string constants and placeholders
+           q = []; // number interpolators
 
-           action.delta = function() {
-               return _delta;
-           };
+           a = parse(a), b = parse(b);
+           translate(a.translateX, a.translateY, b.translateX, b.translateY, s, q);
+           rotate(a.rotate, b.rotate, s, q);
+           skewX(a.skewX, b.skewX, s, q);
+           scale(a.scaleX, a.scaleY, b.scaleX, b.scaleY, s, q);
+           a = b = null; // gc
 
+           return function (t) {
+             var i = -1,
+                 n = q.length,
+                 o;
 
-           return action;
-       }
+             while (++i < n) {
+               s[(o = q[i]).i] = o.x(t);
+             }
 
-       function actionMoveMember(relationId, fromIndex, toIndex) {
-           return function(graph) {
-               return graph.replace(graph.entity(relationId).moveMember(fromIndex, toIndex));
+             return s.join("");
            };
+         };
        }
 
-       function actionMoveNode(nodeID, toLoc) {
-
-           var action = function(graph, t) {
-               if (t === null || !isFinite(t)) t = 1;
-               t = Math.min(Math.max(+t, 0), 1);
-
-               var node = graph.entity(nodeID);
-               return graph.replace(
-                   node.move(geoVecInterp(node.loc, toLoc, t))
-               );
-           };
+       var interpolateTransformCss = interpolateTransform(parseCss, "px, ", "px)", "deg)");
+       var interpolateTransformSvg = interpolateTransform(parseSvg, ", ", ")", ")");
 
-           action.transitionable = true;
+       var epsilon2$1 = 1e-12;
 
-           return action;
+       function cosh(x) {
+         return ((x = Math.exp(x)) + 1 / x) / 2;
        }
 
-       function actionNoop() {
-           return function(graph) {
-               return graph;
-           };
+       function sinh(x) {
+         return ((x = Math.exp(x)) - 1 / x) / 2;
        }
 
-       function actionOrthogonalize(wayID, projection, vertexID, degThresh, ep) {
-           var epsilon = ep || 1e-4;
-           var threshold = degThresh || 13;  // degrees within right or straight to alter
-
-           // We test normalized dot products so we can compare as cos(angle)
-           var lowerThreshold = Math.cos((90 - threshold) * Math.PI / 180);
-           var upperThreshold = Math.cos(threshold * Math.PI / 180);
-
-
-           var action = function(graph, t) {
-               if (t === null || !isFinite(t)) t = 1;
-               t = Math.min(Math.max(+t, 0), 1);
-
-               var way = graph.entity(wayID);
-               way = way.removeNode('');   // sanity check - remove any consecutive duplicates
-
-               if (way.tags.nonsquare) {
-                   var tags = Object.assign({}, way.tags);
-                   // since we're squaring, remove indication that this is physically unsquare
-                   delete tags.nonsquare;
-                   way = way.update({tags: tags});
-               }
-
-               graph = graph.replace(way);
-
-               var isClosed = way.isClosed();
-               var nodes = graph.childNodes(way).slice();  // shallow copy
-               if (isClosed) nodes.pop();
-
-               if (vertexID !== undefined) {
-                   nodes = nodeSubset(nodes, vertexID, isClosed);
-                   if (nodes.length !== 3) return graph;
-               }
-
-               // note: all geometry functions here use the unclosed node/point/coord list
-
-               var nodeCount = {};
-               var points = [];
-               var corner = { i: 0, dotp: 1 };
-               var node, point, loc, score, motions, i, j;
-
-               for (i = 0; i < nodes.length; i++) {
-                   node = nodes[i];
-                   nodeCount[node.id] = (nodeCount[node.id] || 0) + 1;
-                   points.push({ id: node.id, coord: projection(node.loc) });
-               }
-
-
-               if (points.length === 3) {   // move only one vertex for right triangle
-                   for (i = 0; i < 1000; i++) {
-                       motions = points.map(calcMotion);
-
-                       points[corner.i].coord = geoVecAdd(points[corner.i].coord, motions[corner.i]);
-                       score = corner.dotp;
-                       if (score < epsilon) {
-                           break;
-                       }
-                   }
-
-                   node = graph.entity(nodes[corner.i].id);
-                   loc = projection.invert(points[corner.i].coord);
-                   graph = graph.replace(node.move(geoVecInterp(node.loc, loc, t)));
-
-               } else {
-                   var straights = [];
-                   var simplified = [];
-
-                   // Remove points from nearly straight sections..
-                   // This produces a simplified shape to orthogonalize
-                   for (i = 0; i < points.length; i++) {
-                       point = points[i];
-                       var dotp = 0;
-                       if (isClosed || (i > 0 && i < points.length - 1)) {
-                           var a = points[(i - 1 + points.length) % points.length];
-                           var b = points[(i + 1) % points.length];
-                           dotp = Math.abs(geoOrthoNormalizedDotProduct(a.coord, b.coord, point.coord));
-                       }
-
-                       if (dotp > upperThreshold) {
-                           straights.push(point);
-                       } else {
-                           simplified.push(point);
-                       }
-                   }
-
-                   // Orthogonalize the simplified shape
-                   var bestPoints = clonePoints(simplified);
-                   var originalPoints = clonePoints(simplified);
-
-                   score = Infinity;
-                   for (i = 0; i < 1000; i++) {
-                       motions = simplified.map(calcMotion);
-
-                       for (j = 0; j < motions.length; j++) {
-                           simplified[j].coord = geoVecAdd(simplified[j].coord, motions[j]);
-                       }
-                       var newScore = geoOrthoCalcScore(simplified, isClosed, epsilon, threshold);
-                       if (newScore < score) {
-                           bestPoints = clonePoints(simplified);
-                           score = newScore;
-                       }
-                       if (score < epsilon) {
-                           break;
-                       }
-                   }
-
-                   var bestCoords = bestPoints.map(function(p) { return p.coord; });
-                   if (isClosed) bestCoords.push(bestCoords[0]);
-
-                   // move the nodes that should move
-                   for (i = 0; i < bestPoints.length; i++) {
-                       point = bestPoints[i];
-                       if (!geoVecEqual(originalPoints[i].coord, point.coord)) {
-                           node = graph.entity(point.id);
-                           loc = projection.invert(point.coord);
-                           graph = graph.replace(node.move(geoVecInterp(node.loc, loc, t)));
-                       }
-                   }
-
-                   // move the nodes along straight segments
-                   for (i = 0; i < straights.length; i++) {
-                       point = straights[i];
-                       if (nodeCount[point.id] > 1) continue;   // skip self-intersections
-
-                       node = graph.entity(point.id);
-
-                       if (t === 1 &&
-                           graph.parentWays(node).length === 1 &&
-                           graph.parentRelations(node).length === 0 &&
-                           !node.hasInterestingTags()
-                       ) {
-                           // remove uninteresting points..
-                           graph = actionDeleteNode(node.id)(graph);
-
-                       } else {
-                           // move interesting points to the nearest edge..
-                           var choice = geoVecProject(point.coord, bestCoords);
-                           if (choice) {
-                               loc = projection.invert(choice.target);
-                               graph = graph.replace(node.move(geoVecInterp(node.loc, loc, t)));
-                           }
-                       }
-                   }
-               }
-
-               return graph;
-
-
-               function clonePoints(array) {
-                   return array.map(function(p) {
-                       return { id: p.id, coord: [p.coord[0], p.coord[1]] };
-                   });
-               }
-
-
-               function calcMotion(point, i, array) {
-                   // don't try to move the endpoints of a non-closed way.
-                   if (!isClosed && (i === 0 || i === array.length - 1)) return [0, 0];
-                   // don't try to move a node that appears more than once (self intersection)
-                   if (nodeCount[array[i].id] > 1) return [0, 0];
+       function tanh(x) {
+         return ((x = Math.exp(2 * x)) - 1) / (x + 1);
+       }
 
-                   var a = array[(i - 1 + array.length) % array.length].coord;
-                   var origin = point.coord;
-                   var b = array[(i + 1) % array.length].coord;
-                   var p = geoVecSubtract(a, origin);
-                   var q = geoVecSubtract(b, origin);
+       var interpolateZoom = (function zoomRho(rho, rho2, rho4) {
+         // p0 = [ux0, uy0, w0]
+         // p1 = [ux1, uy1, w1]
+         function zoom(p0, p1) {
+           var ux0 = p0[0],
+               uy0 = p0[1],
+               w0 = p0[2],
+               ux1 = p1[0],
+               uy1 = p1[1],
+               w1 = p1[2],
+               dx = ux1 - ux0,
+               dy = uy1 - uy0,
+               d2 = dx * dx + dy * dy,
+               i,
+               S; // Special case for u0 ≅ u1.
+
+           if (d2 < epsilon2$1) {
+             S = Math.log(w1 / w0) / rho;
+
+             i = function i(t) {
+               return [ux0 + t * dx, uy0 + t * dy, w0 * Math.exp(rho * t * S)];
+             };
+           } // General case.
+           else {
+               var d1 = Math.sqrt(d2),
+                   b0 = (w1 * w1 - w0 * w0 + rho4 * d2) / (2 * w0 * rho2 * d1),
+                   b1 = (w1 * w1 - w0 * w0 - rho4 * d2) / (2 * w1 * rho2 * d1),
+                   r0 = Math.log(Math.sqrt(b0 * b0 + 1) - b0),
+                   r1 = Math.log(Math.sqrt(b1 * b1 + 1) - b1);
+               S = (r1 - r0) / rho;
+
+               i = function i(t) {
+                 var s = t * S,
+                     coshr0 = cosh(r0),
+                     u = w0 / (rho2 * d1) * (coshr0 * tanh(rho * s + r0) - sinh(r0));
+                 return [ux0 + u * dx, uy0 + u * dy, w0 * coshr0 / cosh(rho * s + r0)];
+               };
+             }
 
-                   var scale = 2 * Math.min(geoVecLength(p), geoVecLength(q));
-                   p = geoVecNormalize(p);
-                   q = geoVecNormalize(q);
+           i.duration = S * 1000 * rho / Math.SQRT2;
+           return i;
+         }
 
-                   var dotp = (p[0] * q[0] + p[1] * q[1]);
-                   var val = Math.abs(dotp);
+         zoom.rho = function (_) {
+           var _1 = Math.max(1e-3, +_),
+               _2 = _1 * _1,
+               _4 = _2 * _2;
 
-                   if (val < lowerThreshold) {  // nearly orthogonal
-                       corner.i = i;
-                       corner.dotp = val;
-                       var vec = geoVecNormalize(geoVecAdd(p, q));
-                       return geoVecScale(vec, 0.1 * dotp * scale);
-                   }
+           return zoomRho(_1, _2, _4);
+         };
 
-                   return [0, 0];   // do nothing
-               }
-           };
+         return zoom;
+       })(Math.SQRT2, 2, 4);
 
+       function d3_quantize (interpolator, n) {
+         var samples = new Array(n);
 
-           // if we are only orthogonalizing one vertex,
-           // get that vertex and the previous and next
-           function nodeSubset(nodes, vertexID, isClosed) {
-               var first = isClosed ? 0 : 1;
-               var last = isClosed ? nodes.length : nodes.length - 1;
+         for (var i = 0; i < n; ++i) {
+           samples[i] = interpolator(i / (n - 1));
+         }
 
-               for (var i = first; i < last; i++) {
-                   if (nodes[i].id === vertexID) {
-                       return [
-                           nodes[(i - 1 + nodes.length) % nodes.length],
-                           nodes[i],
-                           nodes[(i + 1) % nodes.length]
-                       ];
-                   }
-               }
+         return samples;
+       }
 
-               return [];
-           }
+       // `Function.prototype.bind` method
+       // https://tc39.github.io/ecma262/#sec-function.prototype.bind
+       _export({ target: 'Function', proto: true }, {
+         bind: functionBind
+       });
 
+       var frame = 0,
+           // is an animation frame pending?
+       timeout = 0,
+           // is a timeout pending?
+       interval = 0,
+           // are any timers active?
+       pokeDelay = 1000,
+           // how frequently we check for clock skew
+       taskHead,
+           taskTail,
+           clockLast = 0,
+           clockNow = 0,
+           clockSkew = 0,
+           clock = (typeof performance === "undefined" ? "undefined" : _typeof(performance)) === "object" && performance.now ? performance : Date,
+           setFrame = (typeof window === "undefined" ? "undefined" : _typeof(window)) === "object" && window.requestAnimationFrame ? window.requestAnimationFrame.bind(window) : function (f) {
+         setTimeout(f, 17);
+       };
+       function now() {
+         return clockNow || (setFrame(clearNow), clockNow = clock.now() + clockSkew);
+       }
 
-           action.disabled = function(graph) {
-               var way = graph.entity(wayID);
-               way = way.removeNode('');  // sanity check - remove any consecutive duplicates
-               graph = graph.replace(way);
+       function clearNow() {
+         clockNow = 0;
+       }
 
-               var isClosed = way.isClosed();
-               var nodes = graph.childNodes(way).slice();  // shallow copy
-               if (isClosed) nodes.pop();
+       function Timer() {
+         this._call = this._time = this._next = null;
+       }
+       Timer.prototype = timer.prototype = {
+         constructor: Timer,
+         restart: function restart(callback, delay, time) {
+           if (typeof callback !== "function") throw new TypeError("callback is not a function");
+           time = (time == null ? now() : +time) + (delay == null ? 0 : +delay);
 
-               var allowStraightAngles = false;
-               if (vertexID !== undefined) {
-                   allowStraightAngles = true;
-                   nodes = nodeSubset(nodes, vertexID, isClosed);
-                   if (nodes.length !== 3) return 'end_vertex';
-               }
+           if (!this._next && taskTail !== this) {
+             if (taskTail) taskTail._next = this;else taskHead = this;
+             taskTail = this;
+           }
 
-               var coords = nodes.map(function(n) { return projection(n.loc); });
-               var score = geoOrthoCanOrthogonalize(coords, isClosed, epsilon, threshold, allowStraightAngles);
+           this._call = callback;
+           this._time = time;
+           sleep();
+         },
+         stop: function stop() {
+           if (this._call) {
+             this._call = null;
+             this._time = Infinity;
+             sleep();
+           }
+         }
+       };
+       function timer(callback, delay, time) {
+         var t = new Timer();
+         t.restart(callback, delay, time);
+         return t;
+       }
+       function timerFlush() {
+         now(); // Get the current time, if not already set.
 
-               if (score === null) {
-                   return 'not_squarish';
-               } else if (score === 0) {
-                   return 'square_enough';
-               } else {
-                   return false;
-               }
-           };
+         ++frame; // Pretend we’ve set an alarm, if we haven’t already.
 
+         var t = taskHead,
+             e;
 
-           action.transitionable = true;
+         while (t) {
+           if ((e = clockNow - t._time) >= 0) t._call.call(null, e);
+           t = t._next;
+         }
 
-           return action;
+         --frame;
        }
 
-       // `actionRestrictTurn` creates a turn restriction relation.
-       //
-       // `turn` must be an `osmTurn` object
-       // see osm/intersection.js, pathToTurn()
-       //
-       // This specifies a restriction of type `restriction` when traveling from
-       // `turn.from.way` toward `turn.to.way` via `turn.via.node` OR `turn.via.ways`.
-       // (The action does not check that these entities form a valid intersection.)
-       //
-       // From, to, and via ways should be split before calling this action.
-       // (old versions of the code would split the ways here, but we no longer do it)
-       //
-       // For testing convenience, accepts a restrictionID to assign to the new
-       // relation. Normally, this will be undefined and the relation will
-       // automatically be assigned a new ID.
-       //
-       function actionRestrictTurn(turn, restrictionType, restrictionID) {
+       function wake() {
+         clockNow = (clockLast = clock.now()) + clockSkew;
+         frame = timeout = 0;
 
-           return function(graph) {
-               var fromWay = graph.entity(turn.from.way);
-               var toWay = graph.entity(turn.to.way);
-               var viaNode = turn.via.node && graph.entity(turn.via.node);
-               var viaWays = turn.via.ways && turn.via.ways.map(function(id) { return graph.entity(id); });
-               var members = [];
+         try {
+           timerFlush();
+         } finally {
+           frame = 0;
+           nap();
+           clockNow = 0;
+         }
+       }
 
-               members.push({ id: fromWay.id, type: 'way',  role: 'from' });
+       function poke() {
+         var now = clock.now(),
+             delay = now - clockLast;
+         if (delay > pokeDelay) clockSkew -= delay, clockLast = now;
+       }
 
-               if (viaNode) {
-                   members.push({ id: viaNode.id,  type: 'node', role: 'via' });
-               } else if (viaWays) {
-                   viaWays.forEach(function(viaWay) {
-                       members.push({ id: viaWay.id,  type: 'way', role: 'via' });
-                   });
-               }
+       function nap() {
+         var t0,
+             t1 = taskHead,
+             t2,
+             time = Infinity;
 
-               members.push({ id: toWay.id, type: 'way',  role: 'to' });
+         while (t1) {
+           if (t1._call) {
+             if (time > t1._time) time = t1._time;
+             t0 = t1, t1 = t1._next;
+           } else {
+             t2 = t1._next, t1._next = null;
+             t1 = t0 ? t0._next = t2 : taskHead = t2;
+           }
+         }
 
-               return graph.replace(osmRelation({
-                   id: restrictionID,
-                   tags: {
-                       type: 'restriction',
-                       restriction: restrictionType
-                   },
-                   members: members
-               }));
-           };
+         taskTail = t0;
+         sleep(time);
        }
 
-       function actionRevert(id) {
-           var action = function(graph) {
-               var entity = graph.hasEntity(id),
-                   base = graph.base().entities[id];
-
-               if (entity && !base) {    // entity will be removed..
-                   if (entity.type === 'node') {
-                       graph.parentWays(entity)
-                           .forEach(function(parent) {
-                               parent = parent.removeNode(id);
-                               graph = graph.replace(parent);
-
-                               if (parent.isDegenerate()) {
-                                   graph = actionDeleteWay(parent.id)(graph);
-                               }
-                           });
-                   }
+       function sleep(time) {
+         if (frame) return; // Soonest alarm already set, or will be.
 
-                   graph.parentRelations(entity)
-                       .forEach(function(parent) {
-                           parent = parent.removeMembersWithID(id);
-                           graph = graph.replace(parent);
+         if (timeout) timeout = clearTimeout(timeout);
+         var delay = time - clockNow; // Strictly less than if we recomputed clockNow.
 
-                           if (parent.isDegenerate()) {
-                               graph = actionDeleteRelation(parent.id)(graph);
-                           }
-                       });
-               }
+         if (delay > 24) {
+           if (time < Infinity) timeout = setTimeout(wake, time - clock.now() - clockSkew);
+           if (interval) interval = clearInterval(interval);
+         } else {
+           if (!interval) clockLast = clock.now(), interval = setInterval(poke, pokeDelay);
+           frame = 1, setFrame(wake);
+         }
+       }
 
-               return graph.revert(id);
-           };
+       function d3_timeout (callback, delay, time) {
+         var t = new Timer();
+         delay = delay == null ? 0 : +delay;
+         t.restart(function (elapsed) {
+           t.stop();
+           callback(elapsed + delay);
+         }, delay, time);
+         return t;
+       }
 
-           return action;
+       var emptyOn = dispatch("start", "end", "cancel", "interrupt");
+       var emptyTween = [];
+       var CREATED = 0;
+       var SCHEDULED = 1;
+       var STARTING = 2;
+       var STARTED = 3;
+       var RUNNING = 4;
+       var ENDING = 5;
+       var ENDED = 6;
+       function schedule (node, name, id, index, group, timing) {
+         var schedules = node.__transition;
+         if (!schedules) node.__transition = {};else if (id in schedules) return;
+         create(node, id, {
+           name: name,
+           index: index,
+           // For context during callback.
+           group: group,
+           // For context during callback.
+           on: emptyOn,
+           tween: emptyTween,
+           time: timing.time,
+           delay: timing.delay,
+           duration: timing.duration,
+           ease: timing.ease,
+           timer: null,
+           state: CREATED
+         });
+       }
+       function init(node, id) {
+         var schedule = get$4(node, id);
+         if (schedule.state > CREATED) throw new Error("too late; already scheduled");
+         return schedule;
+       }
+       function set$4(node, id) {
+         var schedule = get$4(node, id);
+         if (schedule.state > STARTED) throw new Error("too late; already running");
+         return schedule;
+       }
+       function get$4(node, id) {
+         var schedule = node.__transition;
+         if (!schedule || !(schedule = schedule[id])) throw new Error("transition not found");
+         return schedule;
        }
 
-       function actionRotate(rotateIds, pivot, angle, projection) {
+       function create(node, id, self) {
+         var schedules = node.__transition,
+             tween; // Initialize the self timer when the transition is created.
+         // Note the actual delay is not known until the first callback!
 
-           var action = function(graph) {
-               return graph.update(function(graph) {
-                   utilGetAllNodes(rotateIds, graph).forEach(function(node) {
-                       var point = geoRotate([projection(node.loc)], angle, pivot)[0];
-                       graph = graph.replace(node.move(projection.invert(point)));
-                   });
-               });
-           };
+         schedules[id] = self;
+         self.timer = timer(schedule, 0, self.time);
 
-           return action;
-       }
+         function schedule(elapsed) {
+           self.state = SCHEDULED;
+           self.timer.restart(start, self.delay, self.time); // If the elapsed delay is less than our first sleep, start immediately.
 
-       /* Align nodes along their common axis */
-       function actionStraightenNodes(nodeIDs, projection) {
+           if (self.delay <= elapsed) start(elapsed - self.delay);
+         }
 
-           function positionAlongWay(a, o, b) {
-               return geoVecDot(a, b, o) / geoVecDot(b, b, o);
-           }
+         function start(elapsed) {
+           var i, j, n, o; // If the state is not SCHEDULED, then we previously errored on start.
 
-           // returns the endpoints of the long axis of symmetry of the `points` bounding rect 
-           function getEndpoints(points) {
-               var ssr = geoGetSmallestSurroundingRectangle(points);
+           if (self.state !== SCHEDULED) return stop();
 
-               // Choose line pq = axis of symmetry.
-               // The shape's surrounding rectangle has 2 axes of symmetry.
-               // Snap points to the long axis
-               var p1 = [(ssr.poly[0][0] + ssr.poly[1][0]) / 2, (ssr.poly[0][1] + ssr.poly[1][1]) / 2 ];
-               var q1 = [(ssr.poly[2][0] + ssr.poly[3][0]) / 2, (ssr.poly[2][1] + ssr.poly[3][1]) / 2 ];
-               var p2 = [(ssr.poly[3][0] + ssr.poly[4][0]) / 2, (ssr.poly[3][1] + ssr.poly[4][1]) / 2 ];
-               var q2 = [(ssr.poly[1][0] + ssr.poly[2][0]) / 2, (ssr.poly[1][1] + ssr.poly[2][1]) / 2 ];
+           for (i in schedules) {
+             o = schedules[i];
+             if (o.name !== self.name) continue; // While this element already has a starting transition during this frame,
+             // defer starting an interrupting transition until that transition has a
+             // chance to tick (and possibly end); see d3/d3-transition#54!
 
-               var isLong = (geoVecLength(p1, q1) > geoVecLength(p2, q2));
-               if (isLong) {
-                   return [p1, q1];
-               }
-               return [p2, q2];
-           }
+             if (o.state === STARTED) return d3_timeout(start); // Interrupt the active transition, if any.
 
+             if (o.state === RUNNING) {
+               o.state = ENDED;
+               o.timer.stop();
+               o.on.call("interrupt", node, node.__data__, o.index, o.group);
+               delete schedules[i];
+             } // Cancel any pre-empted transitions.
+             else if (+i < id) {
+                 o.state = ENDED;
+                 o.timer.stop();
+                 o.on.call("cancel", node, node.__data__, o.index, o.group);
+                 delete schedules[i];
+               }
+           } // Defer the first tick to end of the current frame; see d3/d3#1576.
+           // Note the transition may be canceled after start and before the first tick!
+           // Note this must be scheduled before the start event; see d3/d3-transition#16!
+           // Assuming this is successful, subsequent callbacks go straight to tick.
 
-           var action = function(graph, t) {
-               if (t === null || !isFinite(t)) t = 1;
-               t = Math.min(Math.max(+t, 0), 1);
 
-               var nodes = nodeIDs.map(function(id) { return graph.entity(id); });
-               var points = nodes.map(function(n) { return projection(n.loc); });
-               var endpoints = getEndpoints(points);
-               var startPoint = endpoints[0];
-               var endPoint = endpoints[1];
+           d3_timeout(function () {
+             if (self.state === STARTED) {
+               self.state = RUNNING;
+               self.timer.restart(tick, self.delay, self.time);
+               tick(elapsed);
+             }
+           }); // Dispatch the start event.
+           // Note this must be done before the tween are initialized.
 
-               // Move points onto the line connecting the endpoints
-               for (var i = 0; i < points.length; i++) {
-                   var node = nodes[i];
-                   var point = points[i];
-                   var u = positionAlongWay(point, startPoint, endPoint);
-                   var point2 = geoVecInterp(startPoint, endPoint, u);
-                   var loc2 = projection.invert(point2);
-                   graph = graph.replace(node.move(geoVecInterp(node.loc, loc2, t)));
-               }
+           self.state = STARTING;
+           self.on.call("start", node, node.__data__, self.index, self.group);
+           if (self.state !== STARTING) return; // interrupted
 
-               return graph;
-           };
+           self.state = STARTED; // Initialize the tween, deleting null tween.
 
+           tween = new Array(n = self.tween.length);
 
-           action.disabled = function(graph) {
+           for (i = 0, j = -1; i < n; ++i) {
+             if (o = self.tween[i].value.call(node, node.__data__, self.index, self.group)) {
+               tween[++j] = o;
+             }
+           }
 
-               var nodes = nodeIDs.map(function(id) { return graph.entity(id); });
-               var points = nodes.map(function(n) { return projection(n.loc); });
-               var endpoints = getEndpoints(points);
-               var startPoint = endpoints[0];
-               var endPoint = endpoints[1];
+           tween.length = j + 1;
+         }
 
-               var maxDistance = 0;
+         function tick(elapsed) {
+           var t = elapsed < self.duration ? self.ease.call(null, elapsed / self.duration) : (self.timer.restart(stop), self.state = ENDING, 1),
+               i = -1,
+               n = tween.length;
 
-               for (var i = 0; i < points.length; i++) {
-                   var point = points[i];
-                   var u = positionAlongWay(point, startPoint, endPoint);
-                   var p = geoVecInterp(startPoint, endPoint, u);
-                   var dist = geoVecLength(p, point);
+           while (++i < n) {
+             tween[i].call(node, t);
+           } // Dispatch the end event.
 
-                   if (!isNaN(dist) && dist > maxDistance) {
-                       maxDistance = dist;
-                   }
-               }
 
-               if (maxDistance < 0.0001) {
-                   return 'straight_enough';
-               }
-           };
+           if (self.state === ENDING) {
+             self.on.call("end", node, node.__data__, self.index, self.group);
+             stop();
+           }
+         }
 
+         function stop() {
+           self.state = ENDED;
+           self.timer.stop();
+           delete schedules[id];
 
-           action.transitionable = true;
+           for (var i in schedules) {
+             return;
+           } // eslint-disable-line no-unused-vars
 
 
-           return action;
+           delete node.__transition;
+         }
        }
 
-       /*
-        * Based on https://github.com/openstreetmap/potlatch2/net/systemeD/potlatch2/tools/Straighten.as
-        */
-       function actionStraightenWay(selectedIDs, projection) {
+       function interrupt (node, name) {
+         var schedules = node.__transition,
+             schedule,
+             active,
+             empty = true,
+             i;
+         if (!schedules) return;
+         name = name == null ? null : name + "";
 
-           function positionAlongWay(a, o, b) {
-               return geoVecDot(a, b, o) / geoVecDot(b, b, o);
+         for (i in schedules) {
+           if ((schedule = schedules[i]).name !== name) {
+             empty = false;
+             continue;
            }
 
-           // Return all selected ways as a continuous, ordered array of nodes
-           function allNodes(graph) {
-               var nodes = [];
-               var startNodes = [];
-               var endNodes = [];
-               var remainingWays = [];
-               var selectedWays = selectedIDs.filter(function(w) {
-                   return graph.entity(w).type === 'way';
-               });
-               var selectedNodes = selectedIDs.filter(function(n) {
-                   return graph.entity(n).type === 'node';
-               });
+           active = schedule.state > STARTING && schedule.state < ENDING;
+           schedule.state = ENDED;
+           schedule.timer.stop();
+           schedule.on.call(active ? "interrupt" : "cancel", node, node.__data__, schedule.index, schedule.group);
+           delete schedules[i];
+         }
 
-               for (var i = 0; i < selectedWays.length; i++) {
-                   var way = graph.entity(selectedWays[i]);
-                   nodes = way.nodes.slice(0);
-                   remainingWays.push(nodes);
-                   startNodes.push(nodes[0]);
-                   endNodes.push(nodes[nodes.length-1]);
-               }
+         if (empty) delete node.__transition;
+       }
 
-               // Remove duplicate end/startNodes (duplicate nodes cannot be at the line end,
-               //   and need to be removed so currNode difference calculation below works)
-               // i.e. ["n-1", "n-1", "n-2"] => ["n-2"]
-               startNodes = startNodes.filter(function(n) {
-                   return startNodes.indexOf(n) === startNodes.lastIndexOf(n);
-               });
-               endNodes = endNodes.filter(function(n) {
-                   return endNodes.indexOf(n) === endNodes.lastIndexOf(n);
-               });
+       function selection_interrupt (name) {
+         return this.each(function () {
+           interrupt(this, name);
+         });
+       }
 
-               // Choose the initial endpoint to start from
-               var currNode = utilArrayDifference(startNodes, endNodes)
-                   .concat(utilArrayDifference(endNodes, startNodes))[0];
-               var nextWay = [];
-               nodes = [];
-
-               // Create nested function outside of loop to avoid "function in loop" lint error
-               var getNextWay = function(currNode, remainingWays) {
-                   return remainingWays.filter(function(way) {
-                       return way[0] === currNode || way[way.length-1] === currNode;
-                   })[0];
-               };
+       function tweenRemove(id, name) {
+         var tween0, tween1;
+         return function () {
+           var schedule = set$4(this, id),
+               tween = schedule.tween; // If this node shared tween with the previous node,
+           // just assign the updated shared tween and we’re done!
+           // Otherwise, copy-on-write.
 
-               // Add nodes to end of nodes array, until all ways are added
-               while (remainingWays.length) {
-                   nextWay = getNextWay(currNode, remainingWays);
-                   remainingWays = utilArrayDifference(remainingWays, [nextWay]);
+           if (tween !== tween0) {
+             tween1 = tween0 = tween;
 
-                   if (nextWay[0] !== currNode) {
-                       nextWay.reverse();
-                   }
-                   nodes = nodes.concat(nextWay);
-                   currNode = nodes[nodes.length-1];
+             for (var i = 0, n = tween1.length; i < n; ++i) {
+               if (tween1[i].name === name) {
+                 tween1 = tween1.slice();
+                 tween1.splice(i, 1);
+                 break;
                }
+             }
+           }
 
-               // If user selected 2 nodes to straighten between, then slice nodes array to those nodes
-               if (selectedNodes.length === 2) {
-                   var startNodeIdx = nodes.indexOf(selectedNodes[0]);
-                   var endNodeIdx = nodes.indexOf(selectedNodes[1]);
-                   var sortedStartEnd = [startNodeIdx, endNodeIdx];
+           schedule.tween = tween1;
+         };
+       }
+
+       function tweenFunction(id, name, value) {
+         var tween0, tween1;
+         if (typeof value !== "function") throw new Error();
+         return function () {
+           var schedule = set$4(this, id),
+               tween = schedule.tween; // If this node shared tween with the previous node,
+           // just assign the updated shared tween and we’re done!
+           // Otherwise, copy-on-write.
 
-                   sortedStartEnd.sort(function(a, b) { return a - b; });
-                   nodes = nodes.slice(sortedStartEnd[0], sortedStartEnd[1]+1);
+           if (tween !== tween0) {
+             tween1 = (tween0 = tween).slice();
+
+             for (var t = {
+               name: name,
+               value: value
+             }, i = 0, n = tween1.length; i < n; ++i) {
+               if (tween1[i].name === name) {
+                 tween1[i] = t;
+                 break;
                }
+             }
 
-               return nodes.map(function(n) { return graph.entity(n); });
+             if (i === n) tween1.push(t);
            }
 
-           function shouldKeepNode(node, graph) {
-               return graph.parentWays(node).length > 1 ||
-                   graph.parentRelations(node).length ||
-                   node.hasInterestingTags();
-           }
+           schedule.tween = tween1;
+         };
+       }
 
+       function transition_tween (name, value) {
+         var id = this._id;
+         name += "";
 
-           var action = function(graph, t) {
-               if (t === null || !isFinite(t)) t = 1;
-               t = Math.min(Math.max(+t, 0), 1);
+         if (arguments.length < 2) {
+           var tween = get$4(this.node(), id).tween;
 
-               var nodes = allNodes(graph);
-               var points = nodes.map(function(n) { return projection(n.loc); });
-               var startPoint = points[0];
-               var endPoint = points[points.length-1];
-               var toDelete = [];
-               var i;
+           for (var i = 0, n = tween.length, t; i < n; ++i) {
+             if ((t = tween[i]).name === name) {
+               return t.value;
+             }
+           }
 
-               for (i = 1; i < points.length-1; i++) {
-                   var node = nodes[i];
-                   var point = points[i];
+           return null;
+         }
 
-                   if (t < 1 || shouldKeepNode(node, graph)) {
-                       var u = positionAlongWay(point, startPoint, endPoint);
-                       var p = geoVecInterp(startPoint, endPoint, u);
-                       var loc2 = projection.invert(p);
-                       graph = graph.replace(node.move(geoVecInterp(node.loc, loc2, t)));
+         return this.each((value == null ? tweenRemove : tweenFunction)(id, name, value));
+       }
+       function tweenValue(transition, name, value) {
+         var id = transition._id;
+         transition.each(function () {
+           var schedule = set$4(this, id);
+           (schedule.value || (schedule.value = {}))[name] = value.apply(this, arguments);
+         });
+         return function (node) {
+           return get$4(node, id).value[name];
+         };
+       }
 
-                   } else {
-                       // safe to delete
-                       if (toDelete.indexOf(node) === -1) {
-                           toDelete.push(node);
-                       }
-                   }
-               }
+       function interpolate$1 (a, b) {
+         var c;
+         return (typeof b === "number" ? d3_interpolateNumber : b instanceof color ? d3_interpolateRgb : (c = color(b)) ? (b = c, d3_interpolateRgb) : interpolateString)(a, b);
+       }
 
-               for (i = 0; i < toDelete.length; i++) {
-                   graph = actionDeleteNode(toDelete[i].id)(graph);
-               }
+       function attrRemove$1(name) {
+         return function () {
+           this.removeAttribute(name);
+         };
+       }
 
-               return graph;
-           };
+       function attrRemoveNS$1(fullname) {
+         return function () {
+           this.removeAttributeNS(fullname.space, fullname.local);
+         };
+       }
 
+       function attrConstant$1(name, interpolate, value1) {
+         var string00,
+             string1 = value1 + "",
+             interpolate0;
+         return function () {
+           var string0 = this.getAttribute(name);
+           return string0 === string1 ? null : string0 === string00 ? interpolate0 : interpolate0 = interpolate(string00 = string0, value1);
+         };
+       }
 
-           action.disabled = function(graph) {
-               // check way isn't too bendy
-               var nodes = allNodes(graph);
-               var points = nodes.map(function(n) { return projection(n.loc); });
-               var startPoint = points[0];
-               var endPoint = points[points.length-1];
-               var threshold = 0.2 * geoVecLength(startPoint, endPoint);
-               var i;
+       function attrConstantNS$1(fullname, interpolate, value1) {
+         var string00,
+             string1 = value1 + "",
+             interpolate0;
+         return function () {
+           var string0 = this.getAttributeNS(fullname.space, fullname.local);
+           return string0 === string1 ? null : string0 === string00 ? interpolate0 : interpolate0 = interpolate(string00 = string0, value1);
+         };
+       }
 
-               if (threshold === 0) {
-                   return 'too_bendy';
-               }
+       function attrFunction$1(name, interpolate, value) {
+         var string00, string10, interpolate0;
+         return function () {
+           var string0,
+               value1 = value(this),
+               string1;
+           if (value1 == null) return void this.removeAttribute(name);
+           string0 = this.getAttribute(name);
+           string1 = value1 + "";
+           return string0 === string1 ? null : string0 === string00 && string1 === string10 ? interpolate0 : (string10 = string1, interpolate0 = interpolate(string00 = string0, value1));
+         };
+       }
 
-               var maxDistance = 0;
+       function attrFunctionNS$1(fullname, interpolate, value) {
+         var string00, string10, interpolate0;
+         return function () {
+           var string0,
+               value1 = value(this),
+               string1;
+           if (value1 == null) return void this.removeAttributeNS(fullname.space, fullname.local);
+           string0 = this.getAttributeNS(fullname.space, fullname.local);
+           string1 = value1 + "";
+           return string0 === string1 ? null : string0 === string00 && string1 === string10 ? interpolate0 : (string10 = string1, interpolate0 = interpolate(string00 = string0, value1));
+         };
+       }
 
-               for (i = 1; i < points.length - 1; i++) {
-                   var point = points[i];
-                   var u = positionAlongWay(point, startPoint, endPoint);
-                   var p = geoVecInterp(startPoint, endPoint, u);
-                   var dist = geoVecLength(p, point);
+       function transition_attr (name, value) {
+         var fullname = namespace(name),
+             i = fullname === "transform" ? interpolateTransformSvg : interpolate$1;
+         return this.attrTween(name, typeof value === "function" ? (fullname.local ? attrFunctionNS$1 : attrFunction$1)(fullname, i, tweenValue(this, "attr." + name, value)) : value == null ? (fullname.local ? attrRemoveNS$1 : attrRemove$1)(fullname) : (fullname.local ? attrConstantNS$1 : attrConstant$1)(fullname, i, value));
+       }
 
-                   // to bendy if point is off by 20% of total start/end distance in projected space
-                   if (isNaN(dist) || dist > threshold) {
-                       return 'too_bendy';
-                   } else if (dist > maxDistance) {
-                       maxDistance = dist;
-                   }
-               }
+       function attrInterpolate(name, i) {
+         return function (t) {
+           this.setAttribute(name, i.call(this, t));
+         };
+       }
 
-               var keepingAllNodes = nodes.every(function(node, i) {
-                   return i === 0 || i === nodes.length - 1 || shouldKeepNode(node, graph);
-               });
+       function attrInterpolateNS(fullname, i) {
+         return function (t) {
+           this.setAttributeNS(fullname.space, fullname.local, i.call(this, t));
+         };
+       }
 
-               if (maxDistance < 0.0001 &&
-                   // Allow straightening even if already straight in order to remove extraneous nodes
-                   keepingAllNodes) {
-                   return 'straight_enough';
-               }
-           };
+       function attrTweenNS(fullname, value) {
+         var t0, i0;
 
-           action.transitionable = true;
+         function tween() {
+           var i = value.apply(this, arguments);
+           if (i !== i0) t0 = (i0 = i) && attrInterpolateNS(fullname, i);
+           return t0;
+         }
 
+         tween._value = value;
+         return tween;
+       }
 
-           return action;
+       function attrTween(name, value) {
+         var t0, i0;
+
+         function tween() {
+           var i = value.apply(this, arguments);
+           if (i !== i0) t0 = (i0 = i) && attrInterpolate(name, i);
+           return t0;
+         }
+
+         tween._value = value;
+         return tween;
        }
 
-       // `actionUnrestrictTurn` deletes a turn restriction relation.
-       //
-       // `turn` must be an `osmTurn` object with a `restrictionID` property.
-       // see osm/intersection.js, pathToTurn()
-       //
-       function actionUnrestrictTurn(turn) {
-           return function(graph) {
-               return actionDeleteRelation(turn.restrictionID)(graph);
-           };
+       function transition_attrTween (name, value) {
+         var key = "attr." + name;
+         if (arguments.length < 2) return (key = this.tween(key)) && key._value;
+         if (value == null) return this.tween(key, null);
+         if (typeof value !== "function") throw new Error();
+         var fullname = namespace(name);
+         return this.tween(key, (fullname.local ? attrTweenNS : attrTween)(fullname, value));
        }
 
-       /* Reflect the given area around its axis of symmetry */
-       function actionReflect(reflectIds, projection) {
-           var _useLongAxis = true;
-
-
-           var action = function(graph, t) {
-               if (t === null || !isFinite(t)) t = 1;
-               t = Math.min(Math.max(+t, 0), 1);
-
-               var nodes = utilGetAllNodes(reflectIds, graph);
-               var points = nodes.map(function(n) { return projection(n.loc); });
-               var ssr = geoGetSmallestSurroundingRectangle(points);
-
-               // Choose line pq = axis of symmetry.
-               // The shape's surrounding rectangle has 2 axes of symmetry.
-               // Reflect across the longer axis by default.
-               var p1 = [(ssr.poly[0][0] + ssr.poly[1][0]) / 2, (ssr.poly[0][1] + ssr.poly[1][1]) / 2 ];
-               var q1 = [(ssr.poly[2][0] + ssr.poly[3][0]) / 2, (ssr.poly[2][1] + ssr.poly[3][1]) / 2 ];
-               var p2 = [(ssr.poly[3][0] + ssr.poly[4][0]) / 2, (ssr.poly[3][1] + ssr.poly[4][1]) / 2 ];
-               var q2 = [(ssr.poly[1][0] + ssr.poly[2][0]) / 2, (ssr.poly[1][1] + ssr.poly[2][1]) / 2 ];
-               var p, q;
-
-               var isLong = (geoVecLength(p1, q1) > geoVecLength(p2, q2));
-               if ((_useLongAxis && isLong) || (!_useLongAxis && !isLong)) {
-                   p = p1;
-                   q = q1;
-               } else {
-                   p = p2;
-                   q = q2;
-               }
-
-               // reflect c across pq
-               // http://math.stackexchange.com/questions/65503/point-reflection-over-a-line
-               var dx = q[0] - p[0];
-               var dy = q[1] - p[1];
-               var a = (dx * dx - dy * dy) / (dx * dx + dy * dy);
-               var b = 2 * dx * dy / (dx * dx + dy * dy);
-               for (var i = 0; i < nodes.length; i++) {
-                   var node = nodes[i];
-                   var c = projection(node.loc);
-                   var c2 = [
-                       a * (c[0] - p[0]) + b * (c[1] - p[1]) + p[0],
-                       b * (c[0] - p[0]) - a * (c[1] - p[1]) + p[1]
-                   ];
-                   var loc2 = projection.invert(c2);
-                   node = node.move(geoVecInterp(node.loc, loc2, t));
-                   graph = graph.replace(node);
-               }
+       function delayFunction(id, value) {
+         return function () {
+           init(this, id).delay = +value.apply(this, arguments);
+         };
+       }
 
-               return graph;
-           };
+       function delayConstant(id, value) {
+         return value = +value, function () {
+           init(this, id).delay = value;
+         };
+       }
 
+       function transition_delay (value) {
+         var id = this._id;
+         return arguments.length ? this.each((typeof value === "function" ? delayFunction : delayConstant)(id, value)) : get$4(this.node(), id).delay;
+       }
 
-           action.useLongAxis = function(val) {
-               if (!arguments.length) return _useLongAxis;
-               _useLongAxis = val;
-               return action;
-           };
+       function durationFunction(id, value) {
+         return function () {
+           set$4(this, id).duration = +value.apply(this, arguments);
+         };
+       }
 
+       function durationConstant(id, value) {
+         return value = +value, function () {
+           set$4(this, id).duration = value;
+         };
+       }
 
-           action.transitionable = true;
+       function transition_duration (value) {
+         var id = this._id;
+         return arguments.length ? this.each((typeof value === "function" ? durationFunction : durationConstant)(id, value)) : get$4(this.node(), id).duration;
+       }
 
+       function easeConstant(id, value) {
+         if (typeof value !== "function") throw new Error();
+         return function () {
+           set$4(this, id).ease = value;
+         };
+       }
 
-           return action;
+       function transition_ease (value) {
+         var id = this._id;
+         return arguments.length ? this.each(easeConstant(id, value)) : get$4(this.node(), id).ease;
        }
 
-       function actionUpgradeTags(entityId, oldTags, replaceTags) {
+       function easeVarying(id, value) {
+         return function () {
+           var v = value.apply(this, arguments);
+           if (typeof v !== "function") throw new Error();
+           set$4(this, id).ease = v;
+         };
+       }
 
-           return function(graph) {
-               var entity = graph.entity(entityId);
-               var tags = Object.assign({}, entity.tags);  // shallow copy
-               var transferValue;
-               var semiIndex;
+       function transition_easeVarying (value) {
+         if (typeof value !== "function") throw new Error();
+         return this.each(easeVarying(this._id, value));
+       }
 
-               for (var oldTagKey in oldTags) {
-                   if (oldTags[oldTagKey] === '*') {
-                       transferValue = tags[oldTagKey];
-                       delete tags[oldTagKey];
-                   } else {
-                       var vals = tags[oldTagKey].split(';').filter(Boolean);
-                       var oldIndex = vals.indexOf(oldTags[oldTagKey]);
-                       if (vals.length === 1 || oldIndex === -1) {
-                           delete tags[oldTagKey];
-                       } else {
-                           if (replaceTags && replaceTags[oldTagKey]) {
-                               // replacing a value within a semicolon-delimited value, note the index
-                               semiIndex = oldIndex;
-                           }
-                           vals.splice(oldIndex, 1);
-                           tags[oldTagKey] = vals.join(';');
-                       }
-                   }
-               }
+       function transition_filter (match) {
+         if (typeof match !== "function") match = matcher(match);
 
-               if (replaceTags) {
-                   for (var replaceKey in replaceTags) {
-                       var replaceValue = replaceTags[replaceKey];
-                       if (replaceValue === '*') {
-                           if (tags[replaceKey] && tags[replaceKey] !== 'no') {
-                               // allow any pre-existing value except `no` (troll tag)
-                               continue;
-                           } else {
-                               // otherwise assume `yes` is okay
-                               tags[replaceKey] = 'yes';
-                           }
-                       } else if (replaceValue === '$1') {
-                           tags[replaceKey] = transferValue;
-                       } else {
-                           if (tags[replaceKey] && oldTags[replaceKey] && semiIndex !== undefined) {
-                               // don't override preexisting values
-                               var existingVals = tags[replaceKey].split(';').filter(Boolean);
-                               if (existingVals.indexOf(replaceValue) === -1) {
-                                   existingVals.splice(semiIndex, 0, replaceValue);
-                                   tags[replaceKey] = existingVals.join(';');
-                               }
-                           } else {
-                               tags[replaceKey] = replaceValue;
-                           }
-                       }
-                   }
-               }
+         for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
+           for (var group = groups[j], n = group.length, subgroup = subgroups[j] = [], node, i = 0; i < n; ++i) {
+             if ((node = group[i]) && match.call(node, node.__data__, i, group)) {
+               subgroup.push(node);
+             }
+           }
+         }
 
-               return graph.replace(entity.update({ tags: tags }));
-           };
+         return new Transition(subgroups, this._parents, this._name, this._id);
        }
 
-       function behaviorEdit(context) {
+       function transition_merge (transition) {
+         if (transition._id !== this._id) throw new Error();
 
-           function behavior() {
-               context.map()
-                   .minzoom(context.minEditableZoom());
+         for (var groups0 = this._groups, groups1 = transition._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
+           for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
+             if (node = group0[i] || group1[i]) {
+               merge[i] = node;
+             }
            }
+         }
 
+         for (; j < m0; ++j) {
+           merges[j] = groups0[j];
+         }
 
-           behavior.off = function() {
-               context.map()
-                   .minzoom(0);
-           };
-
-           return behavior;
+         return new Transition(merges, this._parents, this._name, this._id);
        }
 
-       /*
-          The hover behavior adds the `.hover` class on pointerover to all elements to which
-          the identical datum is bound, and removes it on pointerout.
-
-          The :hover pseudo-class is insufficient for iD's purposes because a datum's visual
-          representation may consist of several elements scattered throughout the DOM hierarchy.
-          Only one of these elements can have the :hover pseudo-class, but all of them will
-          have the .hover class.
-        */
-       function behaviorHover(context) {
-           var dispatch$1 = dispatch('hover');
-           var _selection = select(null);
-           var _newNodeId = null;
-           var _initialNodeID = null;
-           var _altDisables;
-           var _ignoreVertex;
-           var _targets = [];
+       function start(name) {
+         return (name + "").trim().split(/^|\s+/).every(function (t) {
+           var i = t.indexOf(".");
+           if (i >= 0) t = t.slice(0, i);
+           return !t || t === "start";
+         });
+       }
 
-           // use pointer events on supported platforms; fallback to mouse events
-           var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
+       function onFunction(id, name, listener) {
+         var on0,
+             on1,
+             sit = start(name) ? init : set$4;
+         return function () {
+           var schedule = sit(this, id),
+               on = schedule.on; // If this node shared a dispatch with the previous node,
+           // just assign the updated shared dispatch and we’re done!
+           // Otherwise, copy-on-write.
 
+           if (on !== on0) (on1 = (on0 = on).copy()).on(name, listener);
+           schedule.on = on1;
+         };
+       }
 
-           function keydown() {
-               if (_altDisables && event.keyCode === utilKeybinding.modifierCodes.alt) {
-                   _selection.selectAll('.hover')
-                       .classed('hover-suppressed', true)
-                       .classed('hover', false);
+       function transition_on (name, listener) {
+         var id = this._id;
+         return arguments.length < 2 ? get$4(this.node(), id).on.on(name) : this.each(onFunction(id, name, listener));
+       }
 
-                   _selection
-                       .classed('hover-disabled', true);
+       function removeFunction(id) {
+         return function () {
+           var parent = this.parentNode;
 
-                   dispatch$1.call('hover', this, null);
-               }
+           for (var i in this.__transition) {
+             if (+i !== id) return;
            }
 
+           if (parent) parent.removeChild(this);
+         };
+       }
 
-           function keyup() {
-               if (_altDisables && event.keyCode === utilKeybinding.modifierCodes.alt) {
-                   _selection.selectAll('.hover-suppressed')
-                       .classed('hover-suppressed', false)
-                       .classed('hover', true);
+       function transition_remove () {
+         return this.on("end.remove", removeFunction(this._id));
+       }
 
-                   _selection
-                       .classed('hover-disabled', false);
+       function transition_select (select) {
+         var name = this._name,
+             id = this._id;
+         if (typeof select !== "function") select = selector(select);
 
-                   dispatch$1.call('hover', this, _targets);
-               }
+         for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
+           for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
+             if ((node = group[i]) && (subnode = select.call(node, node.__data__, i, group))) {
+               if ("__data__" in node) subnode.__data__ = node.__data__;
+               subgroup[i] = subnode;
+               schedule(subgroup[i], name, id, i, subgroup, get$4(node, id));
+             }
            }
+         }
 
+         return new Transition(subgroups, this._parents, name, id);
+       }
 
-           function behavior(selection) {
-               _selection = selection;
-
-               _targets = [];
+       function transition_selectAll (select) {
+         var name = this._name,
+             id = this._id;
+         if (typeof select !== "function") select = selectorAll(select);
 
-               if (_initialNodeID) {
-                   _newNodeId = _initialNodeID;
-                   _initialNodeID = null;
-               } else {
-                   _newNodeId = null;
+         for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {
+           for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
+             if (node = group[i]) {
+               for (var children = select.call(node, node.__data__, i, group), child, inherit = get$4(node, id), k = 0, l = children.length; k < l; ++k) {
+                 if (child = children[k]) {
+                   schedule(child, name, id, k, children, inherit);
+                 }
                }
 
-               _selection
-                   .on(_pointerPrefix + 'over.hover', pointerover)
-                   .on(_pointerPrefix + 'out.hover', pointerout)
-                   // treat pointerdown as pointerover for touch devices
-                   .on(_pointerPrefix + 'down.hover', pointerover);
-
-               select(window)
-                   .on(_pointerPrefix + 'up.hover pointercancel.hover', pointerout, true)
-                   .on('keydown.hover', keydown)
-                   .on('keyup.hover', keyup);
+               subgroups.push(children);
+               parents.push(node);
+             }
+           }
+         }
 
+         return new Transition(subgroups, parents, name, id);
+       }
 
-               function eventTarget() {
-                   var datum = event.target && event.target.__data__;
-                   if (typeof datum !== 'object') return null;
-                   if (!(datum instanceof osmEntity) && datum.properties && (datum.properties.entity instanceof osmEntity)) {
-                       return datum.properties.entity;
-                   }
-                   return datum;
-               }
+       var Selection$1 = selection.prototype.constructor;
+       function transition_selection () {
+         return new Selection$1(this._groups, this._parents);
+       }
 
-               function pointerover() {
-                   // ignore mouse hovers with buttons pressed unless dragging
-                   if (context.mode().id.indexOf('drag') === -1 &&
-                       (!event.pointerType || event.pointerType === 'mouse') &&
-                       event.buttons) return;
+       function styleNull(name, interpolate) {
+         var string00, string10, interpolate0;
+         return function () {
+           var string0 = styleValue(this, name),
+               string1 = (this.style.removeProperty(name), styleValue(this, name));
+           return string0 === string1 ? null : string0 === string00 && string1 === string10 ? interpolate0 : interpolate0 = interpolate(string00 = string0, string10 = string1);
+         };
+       }
 
-                   var target = eventTarget();
-                   if (target && _targets.indexOf(target) === -1) {
-                       _targets.push(target);
-                       updateHover(_targets);
-                   }
-               }
+       function styleRemove$1(name) {
+         return function () {
+           this.style.removeProperty(name);
+         };
+       }
 
-               function pointerout() {
+       function styleConstant$1(name, interpolate, value1) {
+         var string00,
+             string1 = value1 + "",
+             interpolate0;
+         return function () {
+           var string0 = styleValue(this, name);
+           return string0 === string1 ? null : string0 === string00 ? interpolate0 : interpolate0 = interpolate(string00 = string0, value1);
+         };
+       }
 
-                   var target = eventTarget();
-                   var index = _targets.indexOf(target);
-                   if (index !== -1) {
-                       _targets.splice(index);
-                       updateHover(_targets);
-                   }
-               }
+       function styleFunction$1(name, interpolate, value) {
+         var string00, string10, interpolate0;
+         return function () {
+           var string0 = styleValue(this, name),
+               value1 = value(this),
+               string1 = value1 + "";
+           if (value1 == null) string1 = value1 = (this.style.removeProperty(name), styleValue(this, name));
+           return string0 === string1 ? null : string0 === string00 && string1 === string10 ? interpolate0 : (string10 = string1, interpolate0 = interpolate(string00 = string0, value1));
+         };
+       }
 
-               function allowsVertex(d) {
-                   return d.geometry(context.graph()) === 'vertex' || _mainPresetIndex.allowsVertex(d, context.graph());
-               }
+       function styleMaybeRemove(id, name) {
+         var on0,
+             on1,
+             listener0,
+             key = "style." + name,
+             event = "end." + key,
+             remove;
+         return function () {
+           var schedule = set$4(this, id),
+               on = schedule.on,
+               listener = schedule.value[key] == null ? remove || (remove = styleRemove$1(name)) : undefined; // If this node shared a dispatch with the previous node,
+           // just assign the updated shared dispatch and we’re done!
+           // Otherwise, copy-on-write.
 
-               function modeAllowsHover(target) {
-                   var mode = context.mode();
-                   if (mode.id === 'add-point') {
-                       return mode.preset.matchGeometry('vertex') ||
-                           (target.type !== 'way' && target.geometry(context.graph()) !== 'vertex');
-                   }
-                   return true;
-               }
+           if (on !== on0 || listener0 !== listener) (on1 = (on0 = on).copy()).on(event, listener0 = listener);
+           schedule.on = on1;
+         };
+       }
 
-               function updateHover(targets) {
+       function transition_style (name, value, priority) {
+         var i = (name += "") === "transform" ? interpolateTransformCss : interpolate$1;
+         return value == null ? this.styleTween(name, styleNull(name, i)).on("end.style." + name, styleRemove$1(name)) : typeof value === "function" ? this.styleTween(name, styleFunction$1(name, i, tweenValue(this, "style." + name, value))).each(styleMaybeRemove(this._id, name)) : this.styleTween(name, styleConstant$1(name, i, value), priority).on("end.style." + name, null);
+       }
 
-                   _selection.selectAll('.hover')
-                       .classed('hover', false);
-                   _selection.selectAll('.hover-suppressed')
-                       .classed('hover-suppressed', false);
+       function styleInterpolate(name, i, priority) {
+         return function (t) {
+           this.style.setProperty(name, i.call(this, t), priority);
+         };
+       }
 
-                   var mode = context.mode();
+       function styleTween(name, value, priority) {
+         var t, i0;
 
-                   if (!_newNodeId && (mode.id === 'draw-line' || mode.id === 'draw-area')) {
-                       var node = targets.find(function(target) {
-                           return target instanceof osmEntity && target.type === 'node';
-                       });
-                       _newNodeId = node && node.id;
-                   }
+         function tween() {
+           var i = value.apply(this, arguments);
+           if (i !== i0) t = (i0 = i) && styleInterpolate(name, i, priority);
+           return t;
+         }
 
-                   targets = targets.filter(function(datum) {
-                       if (datum instanceof osmEntity) {
-                           // If drawing a way, don't hover on a node that was just placed. #3974
-                           return datum.id !== _newNodeId &&
-                               (datum.type !== 'node' || !_ignoreVertex || allowsVertex(datum)) &&
-                               modeAllowsHover(datum);
-                       }
-                       return true;
-                   });
+         tween._value = value;
+         return tween;
+       }
 
-                   var selector = '';
+       function transition_styleTween (name, value, priority) {
+         var key = "style." + (name += "");
+         if (arguments.length < 2) return (key = this.tween(key)) && key._value;
+         if (value == null) return this.tween(key, null);
+         if (typeof value !== "function") throw new Error();
+         return this.tween(key, styleTween(name, value, priority == null ? "" : priority));
+       }
 
-                   for (var i in targets) {
-                       var datum = targets[i];
+       function textConstant$1(value) {
+         return function () {
+           this.textContent = value;
+         };
+       }
 
-                       // What are we hovering over?
-                       if (datum.__featurehash__) {
-                           // hovering custom data
-                           selector += ', .data' + datum.__featurehash__;
+       function textFunction$1(value) {
+         return function () {
+           var value1 = value(this);
+           this.textContent = value1 == null ? "" : value1;
+         };
+       }
 
-                       } else if (datum instanceof QAItem) {
-                           selector += ', .' + datum.service + '.itemId-' + datum.id;
+       function transition_text (value) {
+         return this.tween("text", typeof value === "function" ? textFunction$1(tweenValue(this, "text", value)) : textConstant$1(value == null ? "" : value + ""));
+       }
 
-                       } else if (datum instanceof osmNote) {
-                           selector += ', .note-' + datum.id;
+       function textInterpolate(i) {
+         return function (t) {
+           this.textContent = i.call(this, t);
+         };
+       }
 
-                       } else if (datum instanceof osmEntity) {
-                           selector += ', .' + datum.id;
-                           if (datum.type === 'relation') {
-                               for (var j in datum.members) {
-                                   selector += ', .' + datum.members[j].id;
-                               }
-                           }
-                       }
-                   }
+       function textTween(value) {
+         var t0, i0;
 
-                   var suppressed = _altDisables && event && event.altKey;
+         function tween() {
+           var i = value.apply(this, arguments);
+           if (i !== i0) t0 = (i0 = i) && textInterpolate(i);
+           return t0;
+         }
 
-                   if (selector.trim().length) {
-                       // remove the first comma
-                       selector = selector.slice(1);
-                       _selection.selectAll(selector)
-                           .classed(suppressed ? 'hover-suppressed' : 'hover', true);
-                   }
+         tween._value = value;
+         return tween;
+       }
 
-                   dispatch$1.call('hover', this, !suppressed && targets);
-               }
-           }
+       function transition_textTween (value) {
+         var key = "text";
+         if (arguments.length < 1) return (key = this.tween(key)) && key._value;
+         if (value == null) return this.tween(key, null);
+         if (typeof value !== "function") throw new Error();
+         return this.tween(key, textTween(value));
+       }
 
+       function transition_transition () {
+         var name = this._name,
+             id0 = this._id,
+             id1 = newId();
 
-           behavior.off = function(selection) {
-               selection.selectAll('.hover')
-                   .classed('hover', false);
-               selection.selectAll('.hover-suppressed')
-                   .classed('hover-suppressed', false);
-               selection
-                   .classed('hover-disabled', false);
+         for (var groups = this._groups, m = groups.length, j = 0; j < m; ++j) {
+           for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
+             if (node = group[i]) {
+               var inherit = get$4(node, id0);
+               schedule(node, name, id1, i, group, {
+                 time: inherit.time + inherit.delay + inherit.duration,
+                 delay: 0,
+                 duration: inherit.duration,
+                 ease: inherit.ease
+               });
+             }
+           }
+         }
 
-               selection
-                   .on(_pointerPrefix + 'over.hover', null)
-                   .on(_pointerPrefix + 'out.hover', null)
-                   .on(_pointerPrefix + 'down.hover', null);
+         return new Transition(groups, this._parents, name, id1);
+       }
 
-               select(window)
-                   .on(_pointerPrefix + 'up.hover pointercancel.hover', null, true)
-                   .on('keydown.hover', null)
-                   .on('keyup.hover', null);
+       function transition_end () {
+         var on0,
+             on1,
+             that = this,
+             id = that._id,
+             size = that.size();
+         return new Promise(function (resolve, reject) {
+           var cancel = {
+             value: reject
+           },
+               end = {
+             value: function value() {
+               if (--size === 0) resolve();
+             }
            };
+           that.each(function () {
+             var schedule = set$4(this, id),
+                 on = schedule.on; // If this node shared a dispatch with the previous node,
+             // just assign the updated shared dispatch and we’re done!
+             // Otherwise, copy-on-write.
 
+             if (on !== on0) {
+               on1 = (on0 = on).copy();
 
-           behavior.altDisables = function(val) {
-               if (!arguments.length) return _altDisables;
-               _altDisables = val;
-               return behavior;
-           };
-
-           behavior.ignoreVertex = function(val) {
-               if (!arguments.length) return _ignoreVertex;
-               _ignoreVertex = val;
-               return behavior;
-           };
+               on1._.cancel.push(cancel);
 
-           behavior.initialNodeID = function(nodeId) {
-               _initialNodeID = nodeId;
-               return behavior;
-           };
+               on1._.interrupt.push(cancel);
 
-           return utilRebind(behavior, dispatch$1, 'on');
-       }
+               on1._.end.push(end);
+             }
 
-       var _disableSpace = false;
-       var _lastSpace = null;
+             schedule.on = on1;
+           }); // The selection was empty, resolve end immediately
 
+           if (size === 0) resolve();
+         });
+       }
 
-       function behaviorDraw(context) {
-           var dispatch$1 = dispatch(
-               'move', 'down', 'downcancel', 'click', 'clickWay', 'clickNode', 'undo', 'cancel', 'finish'
-           );
+       var id$1 = 0;
+       function Transition(groups, parents, name, id) {
+         this._groups = groups;
+         this._parents = parents;
+         this._name = name;
+         this._id = id;
+       }
+       function transition(name) {
+         return selection().transition(name);
+       }
+       function newId() {
+         return ++id$1;
+       }
+       var selection_prototype = selection.prototype;
+       Transition.prototype = transition.prototype = _defineProperty({
+         constructor: Transition,
+         select: transition_select,
+         selectAll: transition_selectAll,
+         filter: transition_filter,
+         merge: transition_merge,
+         selection: transition_selection,
+         transition: transition_transition,
+         call: selection_prototype.call,
+         nodes: selection_prototype.nodes,
+         node: selection_prototype.node,
+         size: selection_prototype.size,
+         empty: selection_prototype.empty,
+         each: selection_prototype.each,
+         on: transition_on,
+         attr: transition_attr,
+         attrTween: transition_attrTween,
+         style: transition_style,
+         styleTween: transition_styleTween,
+         text: transition_text,
+         textTween: transition_textTween,
+         remove: transition_remove,
+         tween: transition_tween,
+         delay: transition_delay,
+         duration: transition_duration,
+         ease: transition_ease,
+         easeVarying: transition_easeVarying,
+         end: transition_end
+       }, Symbol.iterator, selection_prototype[Symbol.iterator]);
 
-           var keybinding = utilKeybinding('draw');
+       var linear$1 = function linear(t) {
+         return +t;
+       };
 
-           var _hover = behaviorHover(context)
-               .altDisables(true)
-               .ignoreVertex(true)
-               .on('hover', context.ui().sidebar.hover);
-           var _edit = behaviorEdit(context);
+       function cubicInOut(t) {
+         return ((t *= 2) <= 1 ? t * t * t : (t -= 2) * t * t + 2) / 2;
+       }
 
-           var _closeTolerance = 4;
-           var _tolerance = 12;
-           var _mouseLeave = false;
-           var _lastMouse = null;
-           var _lastPointerUpEvent;
+       var defaultTiming = {
+         time: null,
+         // Set on use.
+         delay: 0,
+         duration: 250,
+         ease: cubicInOut
+       };
 
-           var _downPointer;
+       function inherit(node, id) {
+         var timing;
 
-           // use pointer events on supported platforms; fallback to mouse events
-           var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
+         while (!(timing = node.__transition) || !(timing = timing[id])) {
+           if (!(node = node.parentNode)) {
+             throw new Error("transition ".concat(id, " not found"));
+           }
+         }
 
+         return timing;
+       }
 
-           // related code
-           // - `mode/drag_node.js` `datum()`
-           function datum() {
-               var mode = context.mode();
-               var isNote = mode && (mode.id.indexOf('note') !== -1);
-               if (event.altKey || isNote) return {};
+       function selection_transition (name) {
+         var id, timing;
 
-               var element;
-               if (event.type === 'keydown') {
-                   element = _lastMouse && _lastMouse.target;
-               } else {
-                   element = event.target;
-               }
+         if (name instanceof Transition) {
+           id = name._id, name = name._name;
+         } else {
+           id = newId(), (timing = defaultTiming).time = now(), name = name == null ? null : name + "";
+         }
 
-               // When drawing, snap only to touch targets..
-               // (this excludes area fills and active drawing elements)
-               var d = element.__data__;
-               return (d && d.properties && d.properties.target) ? d : {};
+         for (var groups = this._groups, m = groups.length, j = 0; j < m; ++j) {
+           for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
+             if (node = group[i]) {
+               schedule(node, name, id, i, group, timing || inherit(node, id));
+             }
            }
+         }
 
-           function pointerdown() {
+         return new Transition(groups, this._parents, name, id);
+       }
 
-               if (_downPointer) return;
+       selection.prototype.interrupt = selection_interrupt;
+       selection.prototype.transition = selection_transition;
 
-               var pointerLocGetter = utilFastMouse(this);
-               _downPointer = {
-                   id: event.pointerId || 'mouse',
-                   pointerLocGetter: pointerLocGetter,
-                   downTime: +new Date(),
-                   downLoc: pointerLocGetter(event)
-               };
+       var constant$3 = (function (x) {
+         return function () {
+           return x;
+         };
+       });
 
-               dispatch$1.call('down', this, datum());
+       function ZoomEvent(type, _ref) {
+         var sourceEvent = _ref.sourceEvent,
+             target = _ref.target,
+             transform = _ref.transform,
+             dispatch = _ref.dispatch;
+         Object.defineProperties(this, {
+           type: {
+             value: type,
+             enumerable: true,
+             configurable: true
+           },
+           sourceEvent: {
+             value: sourceEvent,
+             enumerable: true,
+             configurable: true
+           },
+           target: {
+             value: target,
+             enumerable: true,
+             configurable: true
+           },
+           transform: {
+             value: transform,
+             enumerable: true,
+             configurable: true
+           },
+           _: {
+             value: dispatch
            }
+         });
+       }
 
-           function pointerup() {
-
-               if (!_downPointer || _downPointer.id !== (event.pointerId || 'mouse')) return;
-
-               var downPointer = _downPointer;
-               _downPointer = null;
-
-               _lastPointerUpEvent = event;
+       function Transform(k, x, y) {
+         this.k = k;
+         this.x = x;
+         this.y = y;
+       }
+       Transform.prototype = {
+         constructor: Transform,
+         scale: function scale(k) {
+           return k === 1 ? this : new Transform(this.k * k, this.x, this.y);
+         },
+         translate: function translate(x, y) {
+           return x === 0 & y === 0 ? this : new Transform(this.k, this.x + this.k * x, this.y + this.k * y);
+         },
+         apply: function apply(point) {
+           return [point[0] * this.k + this.x, point[1] * this.k + this.y];
+         },
+         applyX: function applyX(x) {
+           return x * this.k + this.x;
+         },
+         applyY: function applyY(y) {
+           return y * this.k + this.y;
+         },
+         invert: function invert(location) {
+           return [(location[0] - this.x) / this.k, (location[1] - this.y) / this.k];
+         },
+         invertX: function invertX(x) {
+           return (x - this.x) / this.k;
+         },
+         invertY: function invertY(y) {
+           return (y - this.y) / this.k;
+         },
+         rescaleX: function rescaleX(x) {
+           return x.copy().domain(x.range().map(this.invertX, this).map(x.invert, x));
+         },
+         rescaleY: function rescaleY(y) {
+           return y.copy().domain(y.range().map(this.invertY, this).map(y.invert, y));
+         },
+         toString: function toString() {
+           return "translate(" + this.x + "," + this.y + ") scale(" + this.k + ")";
+         }
+       };
+       var identity$2 = new Transform(1, 0, 0);
 
-               if (downPointer.isCancelled) return;
+       function nopropagation$1(event) {
+         event.stopImmediatePropagation();
+       }
+       function noevent$1 (event) {
+         event.preventDefault();
+         event.stopImmediatePropagation();
+       }
 
-               var t2 = +new Date();
-               var p2 = downPointer.pointerLocGetter(event);
-               var dist = geoVecLength(downPointer.downLoc, p2);
+       // except for pinch-to-zoom, which is sent as a wheel+ctrlKey event
 
-               if (dist < _closeTolerance || (dist < _tolerance && (t2 - downPointer.downTime) < 500)) {
-                   // Prevent a quick second click
-                   select(window).on('click.draw-block', function() {
-                       event.stopPropagation();
-                   }, true);
+       function defaultFilter$1(event) {
+         return (!event.ctrlKey || event.type === 'wheel') && !event.button;
+       }
 
-                   context.map().dblclickZoomEnable(false);
+       function defaultExtent() {
+         var e = this;
 
-                   window.setTimeout(function() {
-                       context.map().dblclickZoomEnable(true);
-                       select(window).on('click.draw-block', null);
-                   }, 500);
+         if (e instanceof SVGElement) {
+           e = e.ownerSVGElement || e;
 
-                   click(p2);
-               }
+           if (e.hasAttribute("viewBox")) {
+             e = e.viewBox.baseVal;
+             return [[e.x, e.y], [e.x + e.width, e.y + e.height]];
            }
 
-           function pointermove() {
-               if (_downPointer &&
-                   _downPointer.id === (event.pointerId || 'mouse') &&
-                   !_downPointer.isCancelled) {
-                   var p2 = _downPointer.pointerLocGetter(event);
-                   var dist = geoVecLength(_downPointer.downLoc, p2);
-                   if (dist >= _closeTolerance) {
-                       _downPointer.isCancelled = true;
-                       dispatch$1.call('downcancel', this);
-                   }
-               }
+           return [[0, 0], [e.width.baseVal.value, e.height.baseVal.value]];
+         }
 
-               if ((event.pointerType && event.pointerType !== 'mouse') ||
-                   event.buttons ||
-                   _downPointer) return;
+         return [[0, 0], [e.clientWidth, e.clientHeight]];
+       }
 
-               // HACK: Mobile Safari likes to send one or more `mouse` type pointermove
-               // events immediately after non-mouse pointerup events; detect and ignore them.
-               if (_lastPointerUpEvent &&
-                   _lastPointerUpEvent.pointerType !== 'mouse' &&
-                   event.timeStamp - _lastPointerUpEvent.timeStamp < 100) return;
+       function defaultTransform() {
+         return this.__zoom || identity$2;
+       }
 
-               _lastMouse = event;
-               dispatch$1.call('move', this, datum());
-           }
+       function defaultWheelDelta(event) {
+         return -event.deltaY * (event.deltaMode === 1 ? 0.05 : event.deltaMode ? 1 : 0.002) * (event.ctrlKey ? 10 : 1);
+       }
 
-           function pointercancel() {
-               if (_downPointer &&
-                   _downPointer.id === (event.pointerId || 'mouse')) {
+       function defaultTouchable$1() {
+         return navigator.maxTouchPoints || "ontouchstart" in this;
+       }
 
-                   if (!_downPointer.isCancelled) {
-                       dispatch$1.call('downcancel', this);
-                   }
-                   _downPointer = null;
-               }
-           }
+       function defaultConstrain(transform, extent, translateExtent) {
+         var dx0 = transform.invertX(extent[0][0]) - translateExtent[0][0],
+             dx1 = transform.invertX(extent[1][0]) - translateExtent[1][0],
+             dy0 = transform.invertY(extent[0][1]) - translateExtent[0][1],
+             dy1 = transform.invertY(extent[1][1]) - translateExtent[1][1];
+         return transform.translate(dx1 > dx0 ? (dx0 + dx1) / 2 : Math.min(0, dx0) || Math.max(0, dx1), dy1 > dy0 ? (dy0 + dy1) / 2 : Math.min(0, dy0) || Math.max(0, dy1));
+       }
 
-           function mouseenter() {
-               _mouseLeave = false;
-           }
+       function d3_zoom () {
+         var filter = defaultFilter$1,
+             extent = defaultExtent,
+             constrain = defaultConstrain,
+             wheelDelta = defaultWheelDelta,
+             touchable = defaultTouchable$1,
+             scaleExtent = [0, Infinity],
+             translateExtent = [[-Infinity, -Infinity], [Infinity, Infinity]],
+             duration = 250,
+             interpolate = interpolateZoom,
+             listeners = dispatch("start", "zoom", "end"),
+             touchstarting,
+             touchfirst,
+             touchending,
+             touchDelay = 500,
+             wheelDelay = 150,
+             clickDistance2 = 0,
+             tapDistance = 10;
 
-           function mouseleave() {
-               _mouseLeave = true;
-           }
+         function zoom(selection) {
+           selection.property("__zoom", defaultTransform).on("wheel.zoom", wheeled).on("mousedown.zoom", mousedowned).on("dblclick.zoom", dblclicked).filter(touchable).on("touchstart.zoom", touchstarted).on("touchmove.zoom", touchmoved).on("touchend.zoom touchcancel.zoom", touchended).style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
+         }
 
-           function allowsVertex(d) {
-               return d.geometry(context.graph()) === 'vertex' || _mainPresetIndex.allowsVertex(d, context.graph());
+         zoom.transform = function (collection, transform, point, event) {
+           var selection = collection.selection ? collection.selection() : collection;
+           selection.property("__zoom", defaultTransform);
+
+           if (collection !== selection) {
+             schedule(collection, transform, point, event);
+           } else {
+             selection.interrupt().each(function () {
+               gesture(this, arguments).event(event).start().zoom(null, typeof transform === "function" ? transform.apply(this, arguments) : transform).end();
+             });
            }
+         };
 
-           // related code
-           // - `mode/drag_node.js`     `doMove()`
-           // - `behavior/draw.js`      `click()`
-           // - `behavior/draw_way.js`  `move()`
-           function click(loc) {
-               var d = datum();
-               var target = d && d.properties && d.properties.entity;
+         zoom.scaleBy = function (selection, k, p, event) {
+           zoom.scaleTo(selection, function () {
+             var k0 = this.__zoom.k,
+                 k1 = typeof k === "function" ? k.apply(this, arguments) : k;
+             return k0 * k1;
+           }, p, event);
+         };
 
-               var mode = context.mode();
+         zoom.scaleTo = function (selection, k, p, event) {
+           zoom.transform(selection, function () {
+             var e = extent.apply(this, arguments),
+                 t0 = this.__zoom,
+                 p0 = p == null ? centroid(e) : typeof p === "function" ? p.apply(this, arguments) : p,
+                 p1 = t0.invert(p0),
+                 k1 = typeof k === "function" ? k.apply(this, arguments) : k;
+             return constrain(translate(scale(t0, k1), p0, p1), e, translateExtent);
+           }, p, event);
+         };
 
-               if (target && target.type === 'node' && allowsVertex(target)) {   // Snap to a node
-                   dispatch$1.call('clickNode', this, target, d);
-                   return;
+         zoom.translateBy = function (selection, x, y, event) {
+           zoom.transform(selection, function () {
+             return constrain(this.__zoom.translate(typeof x === "function" ? x.apply(this, arguments) : x, typeof y === "function" ? y.apply(this, arguments) : y), extent.apply(this, arguments), translateExtent);
+           }, null, event);
+         };
 
-               } else if (target && target.type === 'way' && (mode.id !== 'add-point' || mode.preset.matchGeometry('vertex'))) {   // Snap to a way
-                   var choice = geoChooseEdge(
-                       context.graph().childNodes(target), loc, context.projection, context.activeID()
-                   );
-                   if (choice) {
-                       var edge = [target.nodes[choice.index - 1], target.nodes[choice.index]];
-                       dispatch$1.call('clickWay', this, choice.loc, edge, d);
-                       return;
-                   }
-               } else if (mode.id !== 'add-point' || mode.preset.matchGeometry('point')) {
-                   var locLatLng = context.projection.invert(loc);
-                   dispatch$1.call('click', this, locLatLng, d);
-               }
+         zoom.translateTo = function (selection, x, y, p, event) {
+           zoom.transform(selection, function () {
+             var e = extent.apply(this, arguments),
+                 t = this.__zoom,
+                 p0 = p == null ? centroid(e) : typeof p === "function" ? p.apply(this, arguments) : p;
+             return constrain(identity$2.translate(p0[0], p0[1]).scale(t.k).translate(typeof x === "function" ? -x.apply(this, arguments) : -x, typeof y === "function" ? -y.apply(this, arguments) : -y), e, translateExtent);
+           }, p, event);
+         };
 
-           }
+         function scale(transform, k) {
+           k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], k));
+           return k === transform.k ? transform : new Transform(k, transform.x, transform.y);
+         }
 
-           // treat a spacebar press like a click
-           function space() {
-               event.preventDefault();
-               event.stopPropagation();
+         function translate(transform, p0, p1) {
+           var x = p0[0] - p1[0] * transform.k,
+               y = p0[1] - p1[1] * transform.k;
+           return x === transform.x && y === transform.y ? transform : new Transform(transform.k, x, y);
+         }
 
-               var currSpace = context.map().mouse();
-               if (_disableSpace && _lastSpace) {
-                   var dist = geoVecLength(_lastSpace, currSpace);
-                   if (dist > _tolerance) {
-                       _disableSpace = false;
-                   }
-               }
+         function centroid(extent) {
+           return [(+extent[0][0] + +extent[1][0]) / 2, (+extent[0][1] + +extent[1][1]) / 2];
+         }
 
-               if (_disableSpace || _mouseLeave || !_lastMouse) return;
+         function schedule(transition, transform, point, event) {
+           transition.on("start.zoom", function () {
+             gesture(this, arguments).event(event).start();
+           }).on("interrupt.zoom end.zoom", function () {
+             gesture(this, arguments).event(event).end();
+           }).tween("zoom", function () {
+             var that = this,
+                 args = arguments,
+                 g = gesture(that, args).event(event),
+                 e = extent.apply(that, args),
+                 p = point == null ? centroid(e) : typeof point === "function" ? point.apply(that, args) : point,
+                 w = Math.max(e[1][0] - e[0][0], e[1][1] - e[0][1]),
+                 a = that.__zoom,
+                 b = typeof transform === "function" ? transform.apply(that, args) : transform,
+                 i = interpolate(a.invert(p).concat(w / a.k), b.invert(p).concat(w / b.k));
+             return function (t) {
+               if (t === 1) t = b; // Avoid rounding error on end.
+               else {
+                   var l = i(t),
+                       k = w / l[2];
+                   t = new Transform(k, p[0] - l[0] * k, p[1] - l[1] * k);
+                 }
+               g.zoom(null, t);
+             };
+           });
+         }
 
-               // user must move mouse or release space bar to allow another click
-               _lastSpace = currSpace;
-               _disableSpace = true;
+         function gesture(that, args, clean) {
+           return !clean && that.__zooming || new Gesture(that, args);
+         }
 
-               select(window).on('keyup.space-block', function() {
-                   event.preventDefault();
-                   event.stopPropagation();
-                   _disableSpace = false;
-                   select(window).on('keyup.space-block', null);
-               });
+         function Gesture(that, args) {
+           this.that = that;
+           this.args = args;
+           this.active = 0;
+           this.sourceEvent = null;
+           this.extent = extent.apply(that, args);
+           this.taps = 0;
+         }
 
-               // get the current mouse position
-               var loc = context.map().mouse() ||
-                   // or the map center if the mouse has never entered the map
-                   context.projection(context.map().center());
-               click(loc);
-           }
+         Gesture.prototype = {
+           event: function event(_event) {
+             if (_event) this.sourceEvent = _event;
+             return this;
+           },
+           start: function start() {
+             if (++this.active === 1) {
+               this.that.__zooming = this;
+               this.emit("start");
+             }
 
+             return this;
+           },
+           zoom: function zoom(key, transform) {
+             if (this.mouse && key !== "mouse") this.mouse[1] = transform.invert(this.mouse[0]);
+             if (this.touch0 && key !== "touch") this.touch0[1] = transform.invert(this.touch0[0]);
+             if (this.touch1 && key !== "touch") this.touch1[1] = transform.invert(this.touch1[0]);
+             this.that.__zoom = transform;
+             this.emit("zoom");
+             return this;
+           },
+           end: function end() {
+             if (--this.active === 0) {
+               delete this.that.__zooming;
+               this.emit("end");
+             }
 
-           function backspace() {
-               event.preventDefault();
-               dispatch$1.call('undo');
+             return this;
+           },
+           emit: function emit(type) {
+             var d = select(this.that).datum();
+             listeners.call(type, this.that, new ZoomEvent(type, {
+               sourceEvent: this.sourceEvent,
+               target: zoom,
+               type: type,
+               transform: this.that.__zoom,
+               dispatch: listeners
+             }), d);
            }
+         };
 
-
-           function del() {
-               event.preventDefault();
-               dispatch$1.call('cancel');
+         function wheeled(event) {
+           for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+             args[_key - 1] = arguments[_key];
            }
 
+           if (!filter.apply(this, arguments)) return;
+           var g = gesture(this, args).event(event),
+               t = this.__zoom,
+               k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], t.k * Math.pow(2, wheelDelta.apply(this, arguments)))),
+               p = pointer(event); // If the mouse is in the same location as before, reuse it.
+           // If there were recent wheel events, reset the wheel idle timeout.
 
-           function ret() {
-               event.preventDefault();
-               dispatch$1.call('finish');
-           }
+           if (g.wheel) {
+             if (g.mouse[0][0] !== p[0] || g.mouse[0][1] !== p[1]) {
+               g.mouse[1] = t.invert(g.mouse[0] = p);
+             }
 
+             clearTimeout(g.wheel);
+           } // If this wheel event won’t trigger a transform change, ignore it.
+           else if (t.k === k) return; // Otherwise, capture the mouse point and location at the start.
+             else {
+                 g.mouse = [p, t.invert(p)];
+                 interrupt(this);
+                 g.start();
+               }
 
-           function behavior(selection) {
-               context.install(_hover);
-               context.install(_edit);
+           noevent$1(event);
+           g.wheel = setTimeout(wheelidled, wheelDelay);
+           g.zoom("mouse", constrain(translate(scale(t, k), g.mouse[0], g.mouse[1]), g.extent, translateExtent));
 
-               _downPointer = null;
+           function wheelidled() {
+             g.wheel = null;
+             g.end();
+           }
+         }
 
-               keybinding
-                   .on('⌫', backspace)
-                   .on('⌦', del)
-                   .on('⎋', ret)
-                   .on('↩', ret)
-                   .on('space', space)
-                   .on('⌥space', space);
+         function mousedowned(event) {
+           for (var _len2 = arguments.length, args = new Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
+             args[_key2 - 1] = arguments[_key2];
+           }
 
-               selection
-                   .on('mouseenter.draw', mouseenter)
-                   .on('mouseleave.draw', mouseleave)
-                   .on(_pointerPrefix + 'down.draw', pointerdown)
-                   .on(_pointerPrefix + 'move.draw', pointermove);
+           if (touchending || !filter.apply(this, arguments)) return;
+           var g = gesture(this, args, true).event(event),
+               v = select(event.view).on("mousemove.zoom", mousemoved, true).on("mouseup.zoom", mouseupped, true),
+               p = pointer(event, currentTarget),
+               currentTarget = event.currentTarget,
+               x0 = event.clientX,
+               y0 = event.clientY;
+           dragDisable(event.view);
+           nopropagation$1(event);
+           g.mouse = [p, this.__zoom.invert(p)];
+           interrupt(this);
+           g.start();
 
-               select(window)
-                   .on(_pointerPrefix + 'up.draw', pointerup, true)
-                   .on('pointercancel.draw', pointercancel, true);
+           function mousemoved(event) {
+             noevent$1(event);
 
-               select(document)
-                   .call(keybinding);
+             if (!g.moved) {
+               var dx = event.clientX - x0,
+                   dy = event.clientY - y0;
+               g.moved = dx * dx + dy * dy > clickDistance2;
+             }
 
-               return behavior;
+             g.event(event).zoom("mouse", constrain(translate(g.that.__zoom, g.mouse[0] = pointer(event, currentTarget), g.mouse[1]), g.extent, translateExtent));
            }
 
+           function mouseupped(event) {
+             v.on("mousemove.zoom mouseup.zoom", null);
+             yesdrag(event.view, g.moved);
+             noevent$1(event);
+             g.event(event).end();
+           }
+         }
 
-           behavior.off = function(selection) {
-               context.ui().sidebar.hover.cancel();
-               context.uninstall(_hover);
-               context.uninstall(_edit);
-
-               selection
-                   .on('mouseenter.draw', null)
-                   .on('mouseleave.draw', null)
-                   .on(_pointerPrefix + 'down.draw', null)
-                   .on(_pointerPrefix + 'move.draw', null);
-
-               select(window)
-                   .on(_pointerPrefix + 'up.draw', null)
-                   .on('pointercancel.draw', null);
-                   // note: keyup.space-block, click.draw-block should remain
+         function dblclicked(event) {
+           for (var _len3 = arguments.length, args = new Array(_len3 > 1 ? _len3 - 1 : 0), _key3 = 1; _key3 < _len3; _key3++) {
+             args[_key3 - 1] = arguments[_key3];
+           }
 
-               select(document)
-                   .call(keybinding.unbind);
-           };
+           if (!filter.apply(this, arguments)) return;
+           var t0 = this.__zoom,
+               p0 = pointer(event.changedTouches ? event.changedTouches[0] : event, this),
+               p1 = t0.invert(p0),
+               k1 = t0.k * (event.shiftKey ? 0.5 : 2),
+               t1 = constrain(translate(scale(t0, k1), p0, p1), extent.apply(this, args), translateExtent);
+           noevent$1(event);
+           if (duration > 0) select(this).transition().duration(duration).call(schedule, t1, p0, event);else select(this).call(zoom.transform, t1, p0, event);
+         }
 
+         function touchstarted(event) {
+           for (var _len4 = arguments.length, args = new Array(_len4 > 1 ? _len4 - 1 : 0), _key4 = 1; _key4 < _len4; _key4++) {
+             args[_key4 - 1] = arguments[_key4];
+           }
 
-           behavior.hover = function() {
-               return _hover;
-           };
+           if (!filter.apply(this, arguments)) return;
+           var touches = event.touches,
+               n = touches.length,
+               g = gesture(this, args, event.changedTouches.length === n).event(event),
+               started,
+               i,
+               t,
+               p;
+           nopropagation$1(event);
 
+           for (i = 0; i < n; ++i) {
+             t = touches[i], p = pointer(t, this);
+             p = [p, this.__zoom.invert(p), t.identifier];
+             if (!g.touch0) g.touch0 = p, started = true, g.taps = 1 + !!touchstarting;else if (!g.touch1 && g.touch0[2] !== p[2]) g.touch1 = p, g.taps = 0;
+           }
 
-           return utilRebind(behavior, dispatch$1, 'on');
-       }
+           if (touchstarting) touchstarting = clearTimeout(touchstarting);
 
-       function initRange(domain, range) {
-         switch (arguments.length) {
-           case 0: break;
-           case 1: this.range(domain); break;
-           default: this.range(range).domain(domain); break;
+           if (started) {
+             if (g.taps < 2) touchfirst = p[0], touchstarting = setTimeout(function () {
+               touchstarting = null;
+             }, touchDelay);
+             interrupt(this);
+             g.start();
+           }
          }
-         return this;
-       }
 
-       var prefix = "$";
+         function touchmoved(event) {
+           if (!this.__zooming) return;
 
-       function Map$1() {}
+           for (var _len5 = arguments.length, args = new Array(_len5 > 1 ? _len5 - 1 : 0), _key5 = 1; _key5 < _len5; _key5++) {
+             args[_key5 - 1] = arguments[_key5];
+           }
 
-       Map$1.prototype = map$2.prototype = {
-         constructor: Map$1,
-         has: function(key) {
-           return (prefix + key) in this;
-         },
-         get: function(key) {
-           return this[prefix + key];
-         },
-         set: function(key, value) {
-           this[prefix + key] = value;
-           return this;
-         },
-         remove: function(key) {
-           var property = prefix + key;
-           return property in this && delete this[property];
-         },
-         clear: function() {
-           for (var property in this) if (property[0] === prefix) delete this[property];
-         },
-         keys: function() {
-           var keys = [];
-           for (var property in this) if (property[0] === prefix) keys.push(property.slice(1));
-           return keys;
-         },
-         values: function() {
-           var values = [];
-           for (var property in this) if (property[0] === prefix) values.push(this[property]);
-           return values;
-         },
-         entries: function() {
-           var entries = [];
-           for (var property in this) if (property[0] === prefix) entries.push({key: property.slice(1), value: this[property]});
-           return entries;
-         },
-         size: function() {
-           var size = 0;
-           for (var property in this) if (property[0] === prefix) ++size;
-           return size;
-         },
-         empty: function() {
-           for (var property in this) if (property[0] === prefix) return false;
-           return true;
-         },
-         each: function(f) {
-           for (var property in this) if (property[0] === prefix) f(this[property], property.slice(1), this);
-         }
-       };
+           var g = gesture(this, args).event(event),
+               touches = event.changedTouches,
+               n = touches.length,
+               i,
+               t,
+               p,
+               l;
+           noevent$1(event);
 
-       function map$2(object, f) {
-         var map = new Map$1;
+           for (i = 0; i < n; ++i) {
+             t = touches[i], p = pointer(t, this);
+             if (g.touch0 && g.touch0[2] === t.identifier) g.touch0[0] = p;else if (g.touch1 && g.touch1[2] === t.identifier) g.touch1[0] = p;
+           }
 
-         // Copy constructor.
-         if (object instanceof Map$1) object.each(function(value, key) { map.set(key, value); });
+           t = g.that.__zoom;
 
-         // Index array by numeric index or specified key function.
-         else if (Array.isArray(object)) {
-           var i = -1,
-               n = object.length,
-               o;
+           if (g.touch1) {
+             var p0 = g.touch0[0],
+                 l0 = g.touch0[1],
+                 p1 = g.touch1[0],
+                 l1 = g.touch1[1],
+                 dp = (dp = p1[0] - p0[0]) * dp + (dp = p1[1] - p0[1]) * dp,
+                 dl = (dl = l1[0] - l0[0]) * dl + (dl = l1[1] - l0[1]) * dl;
+             t = scale(t, Math.sqrt(dp / dl));
+             p = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2];
+             l = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2];
+           } else if (g.touch0) p = g.touch0[0], l = g.touch0[1];else return;
 
-           if (f == null) while (++i < n) map.set(i, object[i]);
-           else while (++i < n) map.set(f(o = object[i], i, object), o);
+           g.zoom("touch", constrain(translate(t, p, l), g.extent, translateExtent));
          }
 
-         // Convert object to map.
-         else if (object) for (var key in object) map.set(key, object[key]);
-
-         return map;
-       }
-
-       function Set$1() {}
+         function touchended(event) {
+           for (var _len6 = arguments.length, args = new Array(_len6 > 1 ? _len6 - 1 : 0), _key6 = 1; _key6 < _len6; _key6++) {
+             args[_key6 - 1] = arguments[_key6];
+           }
 
-       var proto = map$2.prototype;
+           if (!this.__zooming) return;
+           var g = gesture(this, args).event(event),
+               touches = event.changedTouches,
+               n = touches.length,
+               i,
+               t;
+           nopropagation$1(event);
+           if (touchending) clearTimeout(touchending);
+           touchending = setTimeout(function () {
+             touchending = null;
+           }, touchDelay);
 
-       Set$1.prototype = set$2.prototype = {
-         constructor: Set$1,
-         has: proto.has,
-         add: function(value) {
-           value += "";
-           this[prefix + value] = value;
-           return this;
-         },
-         remove: proto.remove,
-         clear: proto.clear,
-         values: proto.keys,
-         size: proto.size,
-         empty: proto.empty,
-         each: proto.each
-       };
+           for (i = 0; i < n; ++i) {
+             t = touches[i];
+             if (g.touch0 && g.touch0[2] === t.identifier) delete g.touch0;else if (g.touch1 && g.touch1[2] === t.identifier) delete g.touch1;
+           }
 
-       function set$2(object, f) {
-         var set = new Set$1;
+           if (g.touch1 && !g.touch0) g.touch0 = g.touch1, delete g.touch1;
+           if (g.touch0) g.touch0[1] = this.__zoom.invert(g.touch0[0]);else {
+             g.end(); // If this was a dbltap, reroute to the (optional) dblclick.zoom handler.
 
-         // Copy constructor.
-         if (object instanceof Set$1) object.each(function(value) { set.add(value); });
+             if (g.taps === 2) {
+               t = pointer(t, this);
 
-         // Otherwise, assume it’s an array.
-         else if (object) {
-           var i = -1, n = object.length;
-           if (f == null) while (++i < n) set.add(object[i]);
-           else while (++i < n) set.add(f(object[i], i, object));
+               if (Math.hypot(touchfirst[0] - t[0], touchfirst[1] - t[1]) < tapDistance) {
+                 var p = select(this).on("dblclick.zoom");
+                 if (p) p.apply(this, arguments);
+               }
+             }
+           }
          }
 
-         return set;
-       }
-
-       var array$1 = Array.prototype;
-
-       var map$3 = array$1.map;
-       var slice$4 = array$1.slice;
+         zoom.wheelDelta = function (_) {
+           return arguments.length ? (wheelDelta = typeof _ === "function" ? _ : constant$3(+_), zoom) : wheelDelta;
+         };
 
-       function constant$4(x) {
-         return function() {
-           return x;
+         zoom.filter = function (_) {
+           return arguments.length ? (filter = typeof _ === "function" ? _ : constant$3(!!_), zoom) : filter;
          };
-       }
 
-       function number$1(x) {
-         return +x;
-       }
+         zoom.touchable = function (_) {
+           return arguments.length ? (touchable = typeof _ === "function" ? _ : constant$3(!!_), zoom) : touchable;
+         };
 
-       var unit = [0, 1];
+         zoom.extent = function (_) {
+           return arguments.length ? (extent = typeof _ === "function" ? _ : constant$3([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), zoom) : extent;
+         };
 
-       function identity$3(x) {
-         return x;
-       }
+         zoom.scaleExtent = function (_) {
+           return arguments.length ? (scaleExtent[0] = +_[0], scaleExtent[1] = +_[1], zoom) : [scaleExtent[0], scaleExtent[1]];
+         };
 
-       function normalize(a, b) {
-         return (b -= (a = +a))
-             ? function(x) { return (x - a) / b; }
-             : constant$4(isNaN(b) ? NaN : 0.5);
-       }
+         zoom.translateExtent = function (_) {
+           return arguments.length ? (translateExtent[0][0] = +_[0][0], translateExtent[1][0] = +_[1][0], translateExtent[0][1] = +_[0][1], translateExtent[1][1] = +_[1][1], zoom) : [[translateExtent[0][0], translateExtent[0][1]], [translateExtent[1][0], translateExtent[1][1]]];
+         };
 
-       function clamper(domain) {
-         var a = domain[0], b = domain[domain.length - 1], t;
-         if (a > b) t = a, a = b, b = t;
-         return function(x) { return Math.max(a, Math.min(b, x)); };
-       }
+         zoom.constrain = function (_) {
+           return arguments.length ? (constrain = _, zoom) : constrain;
+         };
 
-       // normalize(a, b)(x) takes a domain value x in [a,b] and returns the corresponding parameter t in [0,1].
-       // interpolate(a, b)(t) takes a parameter t in [0,1] and returns the corresponding range value x in [a,b].
-       function bimap(domain, range, interpolate) {
-         var d0 = domain[0], d1 = domain[1], r0 = range[0], r1 = range[1];
-         if (d1 < d0) d0 = normalize(d1, d0), r0 = interpolate(r1, r0);
-         else d0 = normalize(d0, d1), r0 = interpolate(r0, r1);
-         return function(x) { return r0(d0(x)); };
-       }
+         zoom.duration = function (_) {
+           return arguments.length ? (duration = +_, zoom) : duration;
+         };
 
-       function polymap(domain, range, interpolate) {
-         var j = Math.min(domain.length, range.length) - 1,
-             d = new Array(j),
-             r = new Array(j),
-             i = -1;
+         zoom.interpolate = function (_) {
+           return arguments.length ? (interpolate = _, zoom) : interpolate;
+         };
 
-         // Reverse descending domains.
-         if (domain[j] < domain[0]) {
-           domain = domain.slice().reverse();
-           range = range.slice().reverse();
-         }
+         zoom.on = function () {
+           var value = listeners.on.apply(listeners, arguments);
+           return value === listeners ? zoom : value;
+         };
 
-         while (++i < j) {
-           d[i] = normalize(domain[i], domain[i + 1]);
-           r[i] = interpolate(range[i], range[i + 1]);
-         }
+         zoom.clickDistance = function (_) {
+           return arguments.length ? (clickDistance2 = (_ = +_) * _, zoom) : Math.sqrt(clickDistance2);
+         };
 
-         return function(x) {
-           var i = bisectRight(domain, x, 1, j) - 1;
-           return r[i](d[i](x));
+         zoom.tapDistance = function (_) {
+           return arguments.length ? (tapDistance = +_, zoom) : tapDistance;
          };
-       }
 
-       function copy$1(source, target) {
-         return target
-             .domain(source.domain())
-             .range(source.range())
-             .interpolate(source.interpolate())
-             .clamp(source.clamp())
-             .unknown(source.unknown());
+         return zoom;
        }
 
-       function transformer$1() {
-         var domain = unit,
-             range = unit,
-             interpolate$1 = interpolate,
-             transform,
-             untransform,
-             unknown,
-             clamp = identity$3,
-             piecewise,
-             output,
-             input;
+       /*
+           Bypasses features of D3's default projection stream pipeline that are unnecessary:
+           * Antimeridian clipping
+           * Spherical rotation
+           * Resampling
+       */
 
-         function rescale() {
-           piecewise = Math.min(domain.length, range.length) > 2 ? polymap : bimap;
-           output = input = null;
-           return scale;
-         }
+       function geoRawMercator() {
+         var project = mercatorRaw;
+         var k = 512 / Math.PI; // scale
 
-         function scale(x) {
-           return isNaN(x = +x) ? unknown : (output || (output = piecewise(domain.map(transform), range, interpolate$1)))(transform(clamp(x)));
+         var x = 0;
+         var y = 0; // translate
+
+         var clipExtent = [[0, 0], [0, 0]];
+
+         function projection(point) {
+           point = project(point[0] * Math.PI / 180, point[1] * Math.PI / 180);
+           return [point[0] * k + x, y - point[1] * k];
          }
 
-         scale.invert = function(y) {
-           return clamp(untransform((input || (input = piecewise(range, domain.map(transform), d3_interpolateNumber)))(y)));
+         projection.invert = function (point) {
+           point = project.invert((point[0] - x) / k, (y - point[1]) / k);
+           return point && [point[0] * 180 / Math.PI, point[1] * 180 / Math.PI];
          };
 
-         scale.domain = function(_) {
-           return arguments.length ? (domain = map$3.call(_, number$1), clamp === identity$3 || (clamp = clamper(domain)), rescale()) : domain.slice();
+         projection.scale = function (_) {
+           if (!arguments.length) return k;
+           k = +_;
+           return projection;
          };
 
-         scale.range = function(_) {
-           return arguments.length ? (range = slice$4.call(_), rescale()) : range.slice();
+         projection.translate = function (_) {
+           if (!arguments.length) return [x, y];
+           x = +_[0];
+           y = +_[1];
+           return projection;
          };
 
-         scale.rangeRound = function(_) {
-           return range = slice$4.call(_), interpolate$1 = interpolateRound, rescale();
+         projection.clipExtent = function (_) {
+           if (!arguments.length) return clipExtent;
+           clipExtent = _;
+           return projection;
          };
 
-         scale.clamp = function(_) {
-           return arguments.length ? (clamp = _ ? clamper(domain) : identity$3, scale) : clamp !== identity$3;
+         projection.transform = function (obj) {
+           if (!arguments.length) return identity$2.translate(x, y).scale(k);
+           x = +obj.x;
+           y = +obj.y;
+           k = +obj.k;
+           return projection;
          };
 
-         scale.interpolate = function(_) {
-           return arguments.length ? (interpolate$1 = _, rescale()) : interpolate$1;
-         };
+         projection.stream = d3_geoTransform({
+           point: function point(x, y) {
+             var vec = projection([x, y]);
+             this.stream.point(vec[0], vec[1]);
+           }
+         }).stream;
+         return projection;
+       }
 
-         scale.unknown = function(_) {
-           return arguments.length ? (unknown = _, scale) : unknown;
-         };
+       function geoOrthoNormalizedDotProduct(a, b, origin) {
+         if (geoVecEqual(origin, a) || geoVecEqual(origin, b)) {
+           return 1; // coincident points, treat as straight and try to remove
+         }
 
-         return function(t, u) {
-           transform = t, untransform = u;
-           return rescale();
-         };
+         return geoVecNormalizedDot(a, b, origin);
        }
 
-       function continuous(transform, untransform) {
-         return transformer$1()(transform, untransform);
+       function geoOrthoFilterDotProduct(dotp, epsilon, lowerThreshold, upperThreshold, allowStraightAngles) {
+         var val = Math.abs(dotp);
+
+         if (val < epsilon) {
+           return 0; // already orthogonal
+         } else if (allowStraightAngles && Math.abs(val - 1) < epsilon) {
+           return 0; // straight angle, which is okay in this case
+         } else if (val < lowerThreshold || val > upperThreshold) {
+           return dotp; // can be adjusted
+         } else {
+           return null; // ignore vertex
+         }
        }
 
-       // Computes the decimal coefficient and exponent of the specified number x with
-       // significant digits p, where x is positive and p is in [1, 21] or undefined.
-       // For example, formatDecimal(1.23) returns ["123", 0].
-       function formatDecimal(x, p) {
-         if ((i = (x = p ? x.toExponential(p - 1) : x.toExponential()).indexOf("e")) < 0) return null; // NaN, ±Infinity
-         var i, coefficient = x.slice(0, i);
+       function geoOrthoCalcScore(points, isClosed, epsilon, threshold) {
+         var score = 0;
+         var first = isClosed ? 0 : 1;
+         var last = isClosed ? points.length : points.length - 1;
+         var coords = points.map(function (p) {
+           return p.coord;
+         });
+         var lowerThreshold = Math.cos((90 - threshold) * Math.PI / 180);
+         var upperThreshold = Math.cos(threshold * Math.PI / 180);
 
-         // The string returned by toExponential either has the form \d\.\d+e[-+]\d+
-         // (e.g., 1.2e+3) or the form \de[-+]\d+ (e.g., 1e+3).
-         return [
-           coefficient.length > 1 ? coefficient[0] + coefficient.slice(2) : coefficient,
-           +x.slice(i + 1)
-         ];
-       }
+         for (var i = first; i < last; i++) {
+           var a = coords[(i - 1 + coords.length) % coords.length];
+           var origin = coords[i];
+           var b = coords[(i + 1) % coords.length];
+           var dotp = geoOrthoFilterDotProduct(geoOrthoNormalizedDotProduct(a, b, origin), epsilon, lowerThreshold, upperThreshold);
+           if (dotp === null) continue; // ignore vertex
 
-       function exponent(x) {
-         return x = formatDecimal(Math.abs(x)), x ? x[1] : NaN;
-       }
+           score = score + 2.0 * Math.min(Math.abs(dotp - 1.0), Math.min(Math.abs(dotp), Math.abs(dotp + 1)));
+         }
 
-       function formatGroup(grouping, thousands) {
-         return function(value, width) {
-           var i = value.length,
-               t = [],
-               j = 0,
-               g = grouping[0],
-               length = 0;
+         return score;
+       } // returns the maximum angle less than `lessThan` between the actual corner and a 0° or 90° corner
 
-           while (i > 0 && g > 0) {
-             if (length + g + 1 > width) g = Math.max(1, width - length);
-             t.push(value.substring(i -= g, i + g));
-             if ((length += g + 1) > width) break;
-             g = grouping[j = (j + 1) % grouping.length];
-           }
+       function geoOrthoMaxOffsetAngle(coords, isClosed, lessThan) {
+         var max = -Infinity;
+         var first = isClosed ? 0 : 1;
+         var last = isClosed ? coords.length : coords.length - 1;
 
-           return t.reverse().join(thousands);
-         };
-       }
+         for (var i = first; i < last; i++) {
+           var a = coords[(i - 1 + coords.length) % coords.length];
+           var origin = coords[i];
+           var b = coords[(i + 1) % coords.length];
+           var normalizedDotP = geoOrthoNormalizedDotProduct(a, b, origin);
+           var angle = Math.acos(Math.abs(normalizedDotP)) * 180 / Math.PI;
+           if (angle > 45) angle = 90 - angle;
+           if (angle >= lessThan) continue;
+           if (angle > max) max = angle;
+         }
 
-       function formatNumerals(numerals) {
-         return function(value) {
-           return value.replace(/[0-9]/g, function(i) {
-             return numerals[+i];
-           });
-         };
-       }
+         if (max === -Infinity) return null;
+         return max;
+       } // similar to geoOrthoCalcScore, but returns quickly if there is something to do
 
-       // [[fill]align][sign][symbol][0][width][,][.precision][~][type]
-       var re = /^(?:(.)?([<>=^]))?([+\-( ])?([$#])?(0)?(\d+)?(,)?(\.\d+)?(~)?([a-z%])?$/i;
+       function geoOrthoCanOrthogonalize(coords, isClosed, epsilon, threshold, allowStraightAngles) {
+         var score = null;
+         var first = isClosed ? 0 : 1;
+         var last = isClosed ? coords.length : coords.length - 1;
+         var lowerThreshold = Math.cos((90 - threshold) * Math.PI / 180);
+         var upperThreshold = Math.cos(threshold * Math.PI / 180);
 
-       function formatSpecifier(specifier) {
-         if (!(match = re.exec(specifier))) throw new Error("invalid format: " + specifier);
-         var match;
-         return new FormatSpecifier({
-           fill: match[1],
-           align: match[2],
-           sign: match[3],
-           symbol: match[4],
-           zero: match[5],
-           width: match[6],
-           comma: match[7],
-           precision: match[8] && match[8].slice(1),
-           trim: match[9],
-           type: match[10]
-         });
-       }
+         for (var i = first; i < last; i++) {
+           var a = coords[(i - 1 + coords.length) % coords.length];
+           var origin = coords[i];
+           var b = coords[(i + 1) % coords.length];
+           var dotp = geoOrthoFilterDotProduct(geoOrthoNormalizedDotProduct(a, b, origin), epsilon, lowerThreshold, upperThreshold, allowStraightAngles);
+           if (dotp === null) continue; // ignore vertex
 
-       formatSpecifier.prototype = FormatSpecifier.prototype; // instanceof
+           if (Math.abs(dotp) > 0) return 1; // something to do
 
-       function FormatSpecifier(specifier) {
-         this.fill = specifier.fill === undefined ? " " : specifier.fill + "";
-         this.align = specifier.align === undefined ? ">" : specifier.align + "";
-         this.sign = specifier.sign === undefined ? "-" : specifier.sign + "";
-         this.symbol = specifier.symbol === undefined ? "" : specifier.symbol + "";
-         this.zero = !!specifier.zero;
-         this.width = specifier.width === undefined ? undefined : +specifier.width;
-         this.comma = !!specifier.comma;
-         this.precision = specifier.precision === undefined ? undefined : +specifier.precision;
-         this.trim = !!specifier.trim;
-         this.type = specifier.type === undefined ? "" : specifier.type + "";
+           score = 0; // already square
+         }
+
+         return score;
        }
 
-       FormatSpecifier.prototype.toString = function() {
-         return this.fill
-             + this.align
-             + this.sign
-             + this.symbol
-             + (this.zero ? "0" : "")
-             + (this.width === undefined ? "" : Math.max(1, this.width | 0))
-             + (this.comma ? "," : "")
-             + (this.precision === undefined ? "" : "." + Math.max(0, this.precision | 0))
-             + (this.trim ? "~" : "")
-             + this.type;
-       };
+       var onFreeze = internalMetadata.onFreeze;
 
-       // Trims insignificant zeros, e.g., replaces 1.2000k with 1.2k.
-       function formatTrim(s) {
-         out: for (var n = s.length, i = 1, i0 = -1, i1; i < n; ++i) {
-           switch (s[i]) {
-             case ".": i0 = i1 = i; break;
-             case "0": if (i0 === 0) i0 = i; i1 = i; break;
-             default: if (!+s[i]) break out; if (i0 > 0) i0 = 0; break;
-           }
+       var nativeFreeze = Object.freeze;
+       var FAILS_ON_PRIMITIVES$4 = fails(function () { nativeFreeze(1); });
+
+       // `Object.freeze` method
+       // https://tc39.github.io/ecma262/#sec-object.freeze
+       _export({ target: 'Object', stat: true, forced: FAILS_ON_PRIMITIVES$4, sham: !freezing }, {
+         freeze: function freeze(it) {
+           return nativeFreeze && isObject(it) ? nativeFreeze(onFreeze(it)) : it;
          }
-         return i0 > 0 ? s.slice(0, i0) + s.slice(i1 + 1) : s;
-       }
+       });
 
-       var prefixExponent;
+       // Returns true if a and b have the same elements at the same indices.
+       function utilArrayIdentical(a, b) {
+         // an array is always identical to itself
+         if (a === b) return true;
+         var i = a.length;
+         if (i !== b.length) return false;
 
-       function formatPrefixAuto(x, p) {
-         var d = formatDecimal(x, p);
-         if (!d) return x + "";
-         var coefficient = d[0],
-             exponent = d[1],
-             i = exponent - (prefixExponent = Math.max(-8, Math.min(8, Math.floor(exponent / 3))) * 3) + 1,
-             n = coefficient.length;
-         return i === n ? coefficient
-             : i > n ? coefficient + new Array(i - n + 1).join("0")
-             : i > 0 ? coefficient.slice(0, i) + "." + coefficient.slice(i)
-             : "0." + new Array(1 - i).join("0") + formatDecimal(x, Math.max(0, p + i - 1))[0]; // less than 1y!
-       }
+         while (i--) {
+           if (a[i] !== b[i]) return false;
+         }
 
-       function formatRounded(x, p) {
-         var d = formatDecimal(x, p);
-         if (!d) return x + "";
-         var coefficient = d[0],
-             exponent = d[1];
-         return exponent < 0 ? "0." + new Array(-exponent).join("0") + coefficient
-             : coefficient.length > exponent + 1 ? coefficient.slice(0, exponent + 1) + "." + coefficient.slice(exponent + 1)
-             : coefficient + new Array(exponent - coefficient.length + 2).join("0");
-       }
+         return true;
+       } // http://2ality.com/2015/01/es6-set-operations.html
+       // Difference (a \ b): create a set that contains those elements of set a that are not in set b.
+       // This operation is also sometimes called minus (-).
+       // var a = [1,2,3];
+       // var b = [4,3,2];
+       // utilArrayDifference(a, b)
+       //   [1]
+       // utilArrayDifference(b, a)
+       //   [4]
 
-       var formatTypes = {
-         "%": function(x, p) { return (x * 100).toFixed(p); },
-         "b": function(x) { return Math.round(x).toString(2); },
-         "c": function(x) { return x + ""; },
-         "d": function(x) { return Math.round(x).toString(10); },
-         "e": function(x, p) { return x.toExponential(p); },
-         "f": function(x, p) { return x.toFixed(p); },
-         "g": function(x, p) { return x.toPrecision(p); },
-         "o": function(x) { return Math.round(x).toString(8); },
-         "p": function(x, p) { return formatRounded(x * 100, p); },
-         "r": formatRounded,
-         "s": formatPrefixAuto,
-         "X": function(x) { return Math.round(x).toString(16).toUpperCase(); },
-         "x": function(x) { return Math.round(x).toString(16); }
-       };
+       function utilArrayDifference(a, b) {
+         var other = new Set(b);
+         return Array.from(new Set(a)).filter(function (v) {
+           return !other.has(v);
+         });
+       } // Intersection (a ∩ b): create a set that contains those elements of set a that are also in set b.
+       // var a = [1,2,3];
+       // var b = [4,3,2];
+       // utilArrayIntersection(a, b)
+       //   [2,3]
 
-       function identity$4(x) {
-         return x;
-       }
+       function utilArrayIntersection(a, b) {
+         var other = new Set(b);
+         return Array.from(new Set(a)).filter(function (v) {
+           return other.has(v);
+         });
+       } // Union (a ∪ b): create a set that contains the elements of both set a and set b.
+       // var a = [1,2,3];
+       // var b = [4,3,2];
+       // utilArrayUnion(a, b)
+       //   [1,2,3,4]
 
-       var map$4 = Array.prototype.map,
-           prefixes = ["y","z","a","f","p","n","µ","m","","k","M","G","T","P","E","Z","Y"];
+       function utilArrayUnion(a, b) {
+         var result = new Set(a);
+         b.forEach(function (v) {
+           result.add(v);
+         });
+         return Array.from(result);
+       } // Returns an Array with all the duplicates removed
+       // var a = [1,1,2,3,3];
+       // utilArrayUniq(a)
+       //   [1,2,3]
 
-       function formatLocale(locale) {
-         var group = locale.grouping === undefined || locale.thousands === undefined ? identity$4 : formatGroup(map$4.call(locale.grouping, Number), locale.thousands + ""),
-             currencyPrefix = locale.currency === undefined ? "" : locale.currency[0] + "",
-             currencySuffix = locale.currency === undefined ? "" : locale.currency[1] + "",
-             decimal = locale.decimal === undefined ? "." : locale.decimal + "",
-             numerals = locale.numerals === undefined ? identity$4 : formatNumerals(map$4.call(locale.numerals, String)),
-             percent = locale.percent === undefined ? "%" : locale.percent + "",
-             minus = locale.minus === undefined ? "-" : locale.minus + "",
-             nan = locale.nan === undefined ? "NaN" : locale.nan + "";
+       function utilArrayUniq(a) {
+         return Array.from(new Set(a));
+       } // Splits array into chunks of given chunk size
+       // var a = [1,2,3,4,5,6,7];
+       // utilArrayChunk(a, 3);
+       //   [[1,2,3],[4,5,6],[7]];
 
-         function newFormat(specifier) {
-           specifier = formatSpecifier(specifier);
+       function utilArrayChunk(a, chunkSize) {
+         if (!chunkSize || chunkSize < 0) return [a.slice()];
+         var result = new Array(Math.ceil(a.length / chunkSize));
+         return Array.from(result, function (item, i) {
+           return a.slice(i * chunkSize, i * chunkSize + chunkSize);
+         });
+       } // Flattens two level array into a single level
+       // var a = [[1,2,3],[4,5,6],[7]];
+       // utilArrayFlatten(a);
+       //   [1,2,3,4,5,6,7];
 
-           var fill = specifier.fill,
-               align = specifier.align,
-               sign = specifier.sign,
-               symbol = specifier.symbol,
-               zero = specifier.zero,
-               width = specifier.width,
-               comma = specifier.comma,
-               precision = specifier.precision,
-               trim = specifier.trim,
-               type = specifier.type;
+       function utilArrayFlatten(a) {
+         return a.reduce(function (acc, val) {
+           return acc.concat(val);
+         }, []);
+       } // Groups the items of the Array according to the given key
+       // `key` can be passed as a property or as a key function
+       //
+       // var pets = [
+       //     { type: 'Dog', name: 'Spot' },
+       //     { type: 'Cat', name: 'Tiger' },
+       //     { type: 'Dog', name: 'Rover' },
+       //     { type: 'Cat', name: 'Leo' }
+       // ];
+       //
+       // utilArrayGroupBy(pets, 'type')
+       //   {
+       //     'Dog': [{type: 'Dog', name: 'Spot'}, {type: 'Dog', name: 'Rover'}],
+       //     'Cat': [{type: 'Cat', name: 'Tiger'}, {type: 'Cat', name: 'Leo'}]
+       //   }
+       //
+       // utilArrayGroupBy(pets, function(item) { return item.name.length; })
+       //   {
+       //     3: [{type: 'Cat', name: 'Leo'}],
+       //     4: [{type: 'Dog', name: 'Spot'}],
+       //     5: [{type: 'Cat', name: 'Tiger'}, {type: 'Dog', name: 'Rover'}]
+       //   }
+
+       function utilArrayGroupBy(a, key) {
+         return a.reduce(function (acc, item) {
+           var group = typeof key === 'function' ? key(item) : item[key];
+           (acc[group] = acc[group] || []).push(item);
+           return acc;
+         }, {});
+       } // Returns an Array with all the duplicates removed
+       // where uniqueness determined by the given key
+       // `key` can be passed as a property or as a key function
+       //
+       // var pets = [
+       //     { type: 'Dog', name: 'Spot' },
+       //     { type: 'Cat', name: 'Tiger' },
+       //     { type: 'Dog', name: 'Rover' },
+       //     { type: 'Cat', name: 'Leo' }
+       // ];
+       //
+       // utilArrayUniqBy(pets, 'type')
+       //   [
+       //     { type: 'Dog', name: 'Spot' },
+       //     { type: 'Cat', name: 'Tiger' }
+       //   ]
+       //
+       // utilArrayUniqBy(pets, function(item) { return item.name.length; })
+       //   [
+       //     { type: 'Dog', name: 'Spot' },
+       //     { type: 'Cat', name: 'Tiger' },
+       //     { type: 'Cat', name: 'Leo' }
+       //   }
+
+       function utilArrayUniqBy(a, key) {
+         var seen = new Set();
+         return a.reduce(function (acc, item) {
+           var val = typeof key === 'function' ? key(item) : item[key];
 
-           // The "n" type is an alias for ",g".
-           if (type === "n") comma = true, type = "g";
+           if (val && !seen.has(val)) {
+             seen.add(val);
+             acc.push(item);
+           }
 
-           // The "" type, and any invalid type, is an alias for ".12~g".
-           else if (!formatTypes[type]) precision === undefined && (precision = 12), trim = true, type = "g";
+           return acc;
+         }, []);
+       }
 
-           // If zero fill is specified, padding goes after sign and before digits.
-           if (zero || (fill === "0" && align === "=")) zero = true, fill = "0", align = "=";
+       // @@match logic
+       fixRegexpWellKnownSymbolLogic('match', 1, function (MATCH, nativeMatch, maybeCallNative) {
+         return [
+           // `String.prototype.match` method
+           // https://tc39.github.io/ecma262/#sec-string.prototype.match
+           function match(regexp) {
+             var O = requireObjectCoercible(this);
+             var matcher = regexp == undefined ? undefined : regexp[MATCH];
+             return matcher !== undefined ? matcher.call(regexp, O) : new RegExp(regexp)[MATCH](String(O));
+           },
+           // `RegExp.prototype[@@match]` method
+           // https://tc39.github.io/ecma262/#sec-regexp.prototype-@@match
+           function (regexp) {
+             var res = maybeCallNative(nativeMatch, regexp, this);
+             if (res.done) return res.value;
+
+             var rx = anObject(regexp);
+             var S = String(this);
+
+             if (!rx.global) return regexpExecAbstract(rx, S);
+
+             var fullUnicode = rx.unicode;
+             rx.lastIndex = 0;
+             var A = [];
+             var n = 0;
+             var result;
+             while ((result = regexpExecAbstract(rx, S)) !== null) {
+               var matchStr = String(result[0]);
+               A[n] = matchStr;
+               if (matchStr === '') rx.lastIndex = advanceStringIndex(S, toLength(rx.lastIndex), fullUnicode);
+               n++;
+             }
+             return n === 0 ? null : A;
+           }
+         ];
+       });
 
-           // Compute the prefix and suffix.
-           // For SI-prefix, the suffix is lazily computed.
-           var prefix = symbol === "$" ? currencyPrefix : symbol === "#" && /[boxX]/.test(type) ? "0" + type.toLowerCase() : "",
-               suffix = symbol === "$" ? currencySuffix : /[%p]/.test(type) ? percent : "";
+       var remove$1 = removeDiacritics;
+       var replacementList = [{
+         base: ' ',
+         chars: "\xA0"
+       }, {
+         base: '0',
+         chars: "\u07C0"
+       }, {
+         base: 'A',
+         chars: "\u24B6\uFF21\xC0\xC1\xC2\u1EA6\u1EA4\u1EAA\u1EA8\xC3\u0100\u0102\u1EB0\u1EAE\u1EB4\u1EB2\u0226\u01E0\xC4\u01DE\u1EA2\xC5\u01FA\u01CD\u0200\u0202\u1EA0\u1EAC\u1EB6\u1E00\u0104\u023A\u2C6F"
+       }, {
+         base: 'AA',
+         chars: "\uA732"
+       }, {
+         base: 'AE',
+         chars: "\xC6\u01FC\u01E2"
+       }, {
+         base: 'AO',
+         chars: "\uA734"
+       }, {
+         base: 'AU',
+         chars: "\uA736"
+       }, {
+         base: 'AV',
+         chars: "\uA738\uA73A"
+       }, {
+         base: 'AY',
+         chars: "\uA73C"
+       }, {
+         base: 'B',
+         chars: "\u24B7\uFF22\u1E02\u1E04\u1E06\u0243\u0181"
+       }, {
+         base: 'C',
+         chars: "\u24B8\uFF23\uA73E\u1E08\u0106C\u0108\u010A\u010C\xC7\u0187\u023B"
+       }, {
+         base: 'D',
+         chars: "\u24B9\uFF24\u1E0A\u010E\u1E0C\u1E10\u1E12\u1E0E\u0110\u018A\u0189\u1D05\uA779"
+       }, {
+         base: 'Dh',
+         chars: "\xD0"
+       }, {
+         base: 'DZ',
+         chars: "\u01F1\u01C4"
+       }, {
+         base: 'Dz',
+         chars: "\u01F2\u01C5"
+       }, {
+         base: 'E',
+         chars: "\u025B\u24BA\uFF25\xC8\xC9\xCA\u1EC0\u1EBE\u1EC4\u1EC2\u1EBC\u0112\u1E14\u1E16\u0114\u0116\xCB\u1EBA\u011A\u0204\u0206\u1EB8\u1EC6\u0228\u1E1C\u0118\u1E18\u1E1A\u0190\u018E\u1D07"
+       }, {
+         base: 'F',
+         chars: "\uA77C\u24BB\uFF26\u1E1E\u0191\uA77B"
+       }, {
+         base: 'G',
+         chars: "\u24BC\uFF27\u01F4\u011C\u1E20\u011E\u0120\u01E6\u0122\u01E4\u0193\uA7A0\uA77D\uA77E\u0262"
+       }, {
+         base: 'H',
+         chars: "\u24BD\uFF28\u0124\u1E22\u1E26\u021E\u1E24\u1E28\u1E2A\u0126\u2C67\u2C75\uA78D"
+       }, {
+         base: 'I',
+         chars: "\u24BE\uFF29\xCC\xCD\xCE\u0128\u012A\u012C\u0130\xCF\u1E2E\u1EC8\u01CF\u0208\u020A\u1ECA\u012E\u1E2C\u0197"
+       }, {
+         base: 'J',
+         chars: "\u24BF\uFF2A\u0134\u0248\u0237"
+       }, {
+         base: 'K',
+         chars: "\u24C0\uFF2B\u1E30\u01E8\u1E32\u0136\u1E34\u0198\u2C69\uA740\uA742\uA744\uA7A2"
+       }, {
+         base: 'L',
+         chars: "\u24C1\uFF2C\u013F\u0139\u013D\u1E36\u1E38\u013B\u1E3C\u1E3A\u0141\u023D\u2C62\u2C60\uA748\uA746\uA780"
+       }, {
+         base: 'LJ',
+         chars: "\u01C7"
+       }, {
+         base: 'Lj',
+         chars: "\u01C8"
+       }, {
+         base: 'M',
+         chars: "\u24C2\uFF2D\u1E3E\u1E40\u1E42\u2C6E\u019C\u03FB"
+       }, {
+         base: 'N',
+         chars: "\uA7A4\u0220\u24C3\uFF2E\u01F8\u0143\xD1\u1E44\u0147\u1E46\u0145\u1E4A\u1E48\u019D\uA790\u1D0E"
+       }, {
+         base: 'NJ',
+         chars: "\u01CA"
+       }, {
+         base: 'Nj',
+         chars: "\u01CB"
+       }, {
+         base: 'O',
+         chars: "\u24C4\uFF2F\xD2\xD3\xD4\u1ED2\u1ED0\u1ED6\u1ED4\xD5\u1E4C\u022C\u1E4E\u014C\u1E50\u1E52\u014E\u022E\u0230\xD6\u022A\u1ECE\u0150\u01D1\u020C\u020E\u01A0\u1EDC\u1EDA\u1EE0\u1EDE\u1EE2\u1ECC\u1ED8\u01EA\u01EC\xD8\u01FE\u0186\u019F\uA74A\uA74C"
+       }, {
+         base: 'OE',
+         chars: "\u0152"
+       }, {
+         base: 'OI',
+         chars: "\u01A2"
+       }, {
+         base: 'OO',
+         chars: "\uA74E"
+       }, {
+         base: 'OU',
+         chars: "\u0222"
+       }, {
+         base: 'P',
+         chars: "\u24C5\uFF30\u1E54\u1E56\u01A4\u2C63\uA750\uA752\uA754"
+       }, {
+         base: 'Q',
+         chars: "\u24C6\uFF31\uA756\uA758\u024A"
+       }, {
+         base: 'R',
+         chars: "\u24C7\uFF32\u0154\u1E58\u0158\u0210\u0212\u1E5A\u1E5C\u0156\u1E5E\u024C\u2C64\uA75A\uA7A6\uA782"
+       }, {
+         base: 'S',
+         chars: "\u24C8\uFF33\u1E9E\u015A\u1E64\u015C\u1E60\u0160\u1E66\u1E62\u1E68\u0218\u015E\u2C7E\uA7A8\uA784"
+       }, {
+         base: 'T',
+         chars: "\u24C9\uFF34\u1E6A\u0164\u1E6C\u021A\u0162\u1E70\u1E6E\u0166\u01AC\u01AE\u023E\uA786"
+       }, {
+         base: 'Th',
+         chars: "\xDE"
+       }, {
+         base: 'TZ',
+         chars: "\uA728"
+       }, {
+         base: 'U',
+         chars: "\u24CA\uFF35\xD9\xDA\xDB\u0168\u1E78\u016A\u1E7A\u016C\xDC\u01DB\u01D7\u01D5\u01D9\u1EE6\u016E\u0170\u01D3\u0214\u0216\u01AF\u1EEA\u1EE8\u1EEE\u1EEC\u1EF0\u1EE4\u1E72\u0172\u1E76\u1E74\u0244"
+       }, {
+         base: 'V',
+         chars: "\u24CB\uFF36\u1E7C\u1E7E\u01B2\uA75E\u0245"
+       }, {
+         base: 'VY',
+         chars: "\uA760"
+       }, {
+         base: 'W',
+         chars: "\u24CC\uFF37\u1E80\u1E82\u0174\u1E86\u1E84\u1E88\u2C72"
+       }, {
+         base: 'X',
+         chars: "\u24CD\uFF38\u1E8A\u1E8C"
+       }, {
+         base: 'Y',
+         chars: "\u24CE\uFF39\u1EF2\xDD\u0176\u1EF8\u0232\u1E8E\u0178\u1EF6\u1EF4\u01B3\u024E\u1EFE"
+       }, {
+         base: 'Z',
+         chars: "\u24CF\uFF3A\u0179\u1E90\u017B\u017D\u1E92\u1E94\u01B5\u0224\u2C7F\u2C6B\uA762"
+       }, {
+         base: 'a',
+         chars: "\u24D0\uFF41\u1E9A\xE0\xE1\xE2\u1EA7\u1EA5\u1EAB\u1EA9\xE3\u0101\u0103\u1EB1\u1EAF\u1EB5\u1EB3\u0227\u01E1\xE4\u01DF\u1EA3\xE5\u01FB\u01CE\u0201\u0203\u1EA1\u1EAD\u1EB7\u1E01\u0105\u2C65\u0250\u0251"
+       }, {
+         base: 'aa',
+         chars: "\uA733"
+       }, {
+         base: 'ae',
+         chars: "\xE6\u01FD\u01E3"
+       }, {
+         base: 'ao',
+         chars: "\uA735"
+       }, {
+         base: 'au',
+         chars: "\uA737"
+       }, {
+         base: 'av',
+         chars: "\uA739\uA73B"
+       }, {
+         base: 'ay',
+         chars: "\uA73D"
+       }, {
+         base: 'b',
+         chars: "\u24D1\uFF42\u1E03\u1E05\u1E07\u0180\u0183\u0253\u0182"
+       }, {
+         base: 'c',
+         chars: "\uFF43\u24D2\u0107\u0109\u010B\u010D\xE7\u1E09\u0188\u023C\uA73F\u2184"
+       }, {
+         base: 'd',
+         chars: "\u24D3\uFF44\u1E0B\u010F\u1E0D\u1E11\u1E13\u1E0F\u0111\u018C\u0256\u0257\u018B\u13E7\u0501\uA7AA"
+       }, {
+         base: 'dh',
+         chars: "\xF0"
+       }, {
+         base: 'dz',
+         chars: "\u01F3\u01C6"
+       }, {
+         base: 'e',
+         chars: "\u24D4\uFF45\xE8\xE9\xEA\u1EC1\u1EBF\u1EC5\u1EC3\u1EBD\u0113\u1E15\u1E17\u0115\u0117\xEB\u1EBB\u011B\u0205\u0207\u1EB9\u1EC7\u0229\u1E1D\u0119\u1E19\u1E1B\u0247\u01DD"
+       }, {
+         base: 'f',
+         chars: "\u24D5\uFF46\u1E1F\u0192"
+       }, {
+         base: 'ff',
+         chars: "\uFB00"
+       }, {
+         base: 'fi',
+         chars: "\uFB01"
+       }, {
+         base: 'fl',
+         chars: "\uFB02"
+       }, {
+         base: 'ffi',
+         chars: "\uFB03"
+       }, {
+         base: 'ffl',
+         chars: "\uFB04"
+       }, {
+         base: 'g',
+         chars: "\u24D6\uFF47\u01F5\u011D\u1E21\u011F\u0121\u01E7\u0123\u01E5\u0260\uA7A1\uA77F\u1D79"
+       }, {
+         base: 'h',
+         chars: "\u24D7\uFF48\u0125\u1E23\u1E27\u021F\u1E25\u1E29\u1E2B\u1E96\u0127\u2C68\u2C76\u0265"
+       }, {
+         base: 'hv',
+         chars: "\u0195"
+       }, {
+         base: 'i',
+         chars: "\u24D8\uFF49\xEC\xED\xEE\u0129\u012B\u012D\xEF\u1E2F\u1EC9\u01D0\u0209\u020B\u1ECB\u012F\u1E2D\u0268\u0131"
+       }, {
+         base: 'j',
+         chars: "\u24D9\uFF4A\u0135\u01F0\u0249"
+       }, {
+         base: 'k',
+         chars: "\u24DA\uFF4B\u1E31\u01E9\u1E33\u0137\u1E35\u0199\u2C6A\uA741\uA743\uA745\uA7A3"
+       }, {
+         base: 'l',
+         chars: "\u24DB\uFF4C\u0140\u013A\u013E\u1E37\u1E39\u013C\u1E3D\u1E3B\u017F\u0142\u019A\u026B\u2C61\uA749\uA781\uA747\u026D"
+       }, {
+         base: 'lj',
+         chars: "\u01C9"
+       }, {
+         base: 'm',
+         chars: "\u24DC\uFF4D\u1E3F\u1E41\u1E43\u0271\u026F"
+       }, {
+         base: 'n',
+         chars: "\u24DD\uFF4E\u01F9\u0144\xF1\u1E45\u0148\u1E47\u0146\u1E4B\u1E49\u019E\u0272\u0149\uA791\uA7A5\u043B\u0509"
+       }, {
+         base: 'nj',
+         chars: "\u01CC"
+       }, {
+         base: 'o',
+         chars: "\u24DE\uFF4F\xF2\xF3\xF4\u1ED3\u1ED1\u1ED7\u1ED5\xF5\u1E4D\u022D\u1E4F\u014D\u1E51\u1E53\u014F\u022F\u0231\xF6\u022B\u1ECF\u0151\u01D2\u020D\u020F\u01A1\u1EDD\u1EDB\u1EE1\u1EDF\u1EE3\u1ECD\u1ED9\u01EB\u01ED\xF8\u01FF\uA74B\uA74D\u0275\u0254\u1D11"
+       }, {
+         base: 'oe',
+         chars: "\u0153"
+       }, {
+         base: 'oi',
+         chars: "\u01A3"
+       }, {
+         base: 'oo',
+         chars: "\uA74F"
+       }, {
+         base: 'ou',
+         chars: "\u0223"
+       }, {
+         base: 'p',
+         chars: "\u24DF\uFF50\u1E55\u1E57\u01A5\u1D7D\uA751\uA753\uA755\u03C1"
+       }, {
+         base: 'q',
+         chars: "\u24E0\uFF51\u024B\uA757\uA759"
+       }, {
+         base: 'r',
+         chars: "\u24E1\uFF52\u0155\u1E59\u0159\u0211\u0213\u1E5B\u1E5D\u0157\u1E5F\u024D\u027D\uA75B\uA7A7\uA783"
+       }, {
+         base: 's',
+         chars: "\u24E2\uFF53\u015B\u1E65\u015D\u1E61\u0161\u1E67\u1E63\u1E69\u0219\u015F\u023F\uA7A9\uA785\u1E9B\u0282"
+       }, {
+         base: 'ss',
+         chars: "\xDF"
+       }, {
+         base: 't',
+         chars: "\u24E3\uFF54\u1E6B\u1E97\u0165\u1E6D\u021B\u0163\u1E71\u1E6F\u0167\u01AD\u0288\u2C66\uA787"
+       }, {
+         base: 'th',
+         chars: "\xFE"
+       }, {
+         base: 'tz',
+         chars: "\uA729"
+       }, {
+         base: 'u',
+         chars: "\u24E4\uFF55\xF9\xFA\xFB\u0169\u1E79\u016B\u1E7B\u016D\xFC\u01DC\u01D8\u01D6\u01DA\u1EE7\u016F\u0171\u01D4\u0215\u0217\u01B0\u1EEB\u1EE9\u1EEF\u1EED\u1EF1\u1EE5\u1E73\u0173\u1E77\u1E75\u0289"
+       }, {
+         base: 'v',
+         chars: "\u24E5\uFF56\u1E7D\u1E7F\u028B\uA75F\u028C"
+       }, {
+         base: 'vy',
+         chars: "\uA761"
+       }, {
+         base: 'w',
+         chars: "\u24E6\uFF57\u1E81\u1E83\u0175\u1E87\u1E85\u1E98\u1E89\u2C73"
+       }, {
+         base: 'x',
+         chars: "\u24E7\uFF58\u1E8B\u1E8D"
+       }, {
+         base: 'y',
+         chars: "\u24E8\uFF59\u1EF3\xFD\u0177\u1EF9\u0233\u1E8F\xFF\u1EF7\u1E99\u1EF5\u01B4\u024F\u1EFF"
+       }, {
+         base: 'z',
+         chars: "\u24E9\uFF5A\u017A\u1E91\u017C\u017E\u1E93\u1E95\u01B6\u0225\u0240\u2C6C\uA763"
+       }];
+       var diacriticsMap = {};
 
-           // What format function should we use?
-           // Is this an integer type?
-           // Can this type generate exponential notation?
-           var formatType = formatTypes[type],
-               maybeSuffix = /[defgprs%]/.test(type);
+       for (var i = 0; i < replacementList.length; i += 1) {
+         var chars = replacementList[i].chars;
 
-           // Set the default precision if not specified,
-           // or clamp the specified precision to the supported range.
-           // For significant precision, it must be in [1, 21].
-           // For fixed precision, it must be in [0, 20].
-           precision = precision === undefined ? 6
-               : /[gprs]/.test(type) ? Math.max(1, Math.min(21, precision))
-               : Math.max(0, Math.min(20, precision));
+         for (var j$1 = 0; j$1 < chars.length; j$1 += 1) {
+           diacriticsMap[chars[j$1]] = replacementList[i].base;
+         }
+       }
 
-           function format(value) {
-             var valuePrefix = prefix,
-                 valueSuffix = suffix,
-                 i, n, c;
+       function removeDiacritics(str) {
+         return str.replace(/[^\u0000-\u007e]/g, function (c) {
+           return diacriticsMap[c] || c;
+         });
+       }
 
-             if (type === "c") {
-               valueSuffix = formatType(value) + valueSuffix;
-               value = "";
-             } else {
-               value = +value;
+       var replacementList_1 = replacementList;
+       var diacriticsMap_1 = diacriticsMap;
+       var diacritics = {
+         remove: remove$1,
+         replacementList: replacementList_1,
+         diacriticsMap: diacriticsMap_1
+       };
 
-               // Determine the sign. -0 is not less than 0, but 1 / -0 is!
-               var valueNegative = value < 0 || 1 / value < 0;
+       var isArabic_1 = createCommonjsModule(function (module, exports) {
 
-               // Perform the initial formatting.
-               value = isNaN(value) ? nan : formatType(Math.abs(value), precision);
+         Object.defineProperty(exports, "__esModule", {
+           value: true
+         });
+         var arabicBlocks = [[0x0600, 0x06FF], [0x0750, 0x077F], [0x08A0, 0x08FF], [0xFB50, 0xFDFF], [0xFE70, 0xFEFF], [0x10E60, 0x10E7F], [0x1EC70, 0x1ECBF], [0x1EE00, 0x1EEFF] // Mathematical Alphabetic symbols https://www.unicode.org/charts/PDF/U1EE00.pdf
+         ];
 
-               // Trim insignificant zeros.
-               if (trim) value = formatTrim(value);
+         function isArabic(_char) {
+           if (_char.length > 1) {
+             // allow the newer chars?
+             throw new Error('isArabic works on only one-character strings');
+           }
 
-               // If a negative value rounds to zero after formatting, and no explicit positive sign is requested, hide the sign.
-               if (valueNegative && +value === 0 && sign !== "+") valueNegative = false;
+           var code = _char.charCodeAt(0);
 
-               // Compute the prefix and suffix.
-               valuePrefix = (valueNegative ? (sign === "(" ? sign : minus) : sign === "-" || sign === "(" ? "" : sign) + valuePrefix;
-               valueSuffix = (type === "s" ? prefixes[8 + prefixExponent / 3] : "") + valueSuffix + (valueNegative && sign === "(" ? ")" : "");
+           for (var i = 0; i < arabicBlocks.length; i++) {
+             var block = arabicBlocks[i];
 
-               // Break the formatted value into the integer “value” part that can be
-               // grouped, and fractional or exponential “suffix” part that is not.
-               if (maybeSuffix) {
-                 i = -1, n = value.length;
-                 while (++i < n) {
-                   if (c = value.charCodeAt(i), 48 > c || c > 57) {
-                     valueSuffix = (c === 46 ? decimal + value.slice(i + 1) : value.slice(i)) + valueSuffix;
-                     value = value.slice(0, i);
-                     break;
-                   }
-                 }
-               }
+             if (code >= block[0] && code <= block[1]) {
+               return true;
              }
+           }
 
-             // If the fill character is not "0", grouping is applied before padding.
-             if (comma && !zero) value = group(value, Infinity);
+           return false;
+         }
 
-             // Compute the padding.
-             var length = valuePrefix.length + value.length + valueSuffix.length,
-                 padding = length < width ? new Array(width - length + 1).join(fill) : "";
+         exports.isArabic = isArabic;
 
-             // If the fill character is "0", grouping is applied after padding.
-             if (comma && zero) value = group(padding + value, padding.length ? width - valueSuffix.length : Infinity), padding = "";
+         function isMath(_char2) {
+           if (_char2.length > 2) {
+             // allow the newer chars?
+             throw new Error('isMath works on only one-character strings');
+           }
 
-             // Reconstruct the final output based on the desired alignment.
-             switch (align) {
-               case "<": value = valuePrefix + value + valueSuffix + padding; break;
-               case "=": value = valuePrefix + padding + value + valueSuffix; break;
-               case "^": value = padding.slice(0, length = padding.length >> 1) + valuePrefix + value + valueSuffix + padding.slice(length); break;
-               default: value = padding + valuePrefix + value + valueSuffix; break;
+           var code = _char2.charCodeAt(0);
+
+           return code >= 0x660 && code <= 0x66C || code >= 0x6F0 && code <= 0x6F9;
+         }
+
+         exports.isMath = isMath;
+       });
+
+       var unicodeArabic = createCommonjsModule(function (module, exports) {
+
+         Object.defineProperty(exports, "__esModule", {
+           value: true
+         });
+         var arabicReference = {
+           "alef": {
+             "normal": ["\u0627"],
+             "madda_above": {
+               "normal": ["\u0627\u0653", "\u0622"],
+               "isolated": "\uFE81",
+               "final": "\uFE82"
+             },
+             "hamza_above": {
+               "normal": ["\u0627\u0654", "\u0623"],
+               "isolated": "\uFE83",
+               "final": "\uFE84"
+             },
+             "hamza_below": {
+               "normal": ["\u0627\u0655", "\u0625"],
+               "isolated": "\uFE87",
+               "final": "\uFE88"
+             },
+             "wasla": {
+               "normal": "\u0671",
+               "isolated": "\uFB50",
+               "final": "\uFB51"
+             },
+             "wavy_hamza_above": ["\u0672"],
+             "wavy_hamza_below": ["\u0627\u065F", "\u0673"],
+             "high_hamza": ["\u0675", "\u0627\u0674"],
+             "indic_two_above": ["\u0773"],
+             "indic_three_above": ["\u0774"],
+             "fathatan": {
+               "normal": ["\u0627\u064B"],
+               "final": "\uFD3C",
+               "isolated": "\uFD3D"
+             },
+             "isolated": "\uFE8D",
+             "final": "\uFE8E"
+           },
+           "beh": {
+             "normal": ["\u0628"],
+             "dotless": ["\u066E"],
+             "three_dots_horizontally_below": ["\u0750"],
+             "dot_below_three_dots_above": ["\u0751"],
+             "three_dots_pointing_upwards_below": ["\u0752"],
+             "three_dots_pointing_upwards_below_two_dots_above": ["\u0753"],
+             "two_dots_below_dot_above": ["\u0754"],
+             "inverted_small_v_below": ["\u0755"],
+             "small_v": ["\u0756"],
+             "small_v_below": ["\u08A0"],
+             "hamza_above": ["\u08A1"],
+             "small_meem_above": ["\u08B6"],
+             "isolated": "\uFE8F",
+             "final": "\uFE90",
+             "initial": "\uFE91",
+             "medial": "\uFE92"
+           },
+           "teh marbuta": {
+             "normal": ["\u0629"],
+             "isolated": "\uFE93",
+             "final": "\uFE94"
+           },
+           "teh": {
+             "normal": ["\u062A"],
+             "ring": ["\u067C"],
+             "three_dots_above_downwards": ["\u067D"],
+             "small_teh_above": ["\u08B8"],
+             "isolated": "\uFE95",
+             "final": "\uFE96",
+             "initial": "\uFE97",
+             "medial": "\uFE98"
+           },
+           "theh": {
+             "normal": ["\u062B"],
+             "isolated": "\uFE99",
+             "final": "\uFE9A",
+             "initial": "\uFE9B",
+             "medial": "\uFE9C"
+           },
+           "jeem": {
+             "normal": ["\u062C"],
+             "two_dots_above": ["\u08A2"],
+             "isolated": "\uFE9D",
+             "final": "\uFE9E",
+             "initial": "\uFE9F",
+             "medial": "\uFEA0"
+           },
+           "hah": {
+             "normal": ["\u062D"],
+             "hamza_above": ["\u0681"],
+             "two_dots_vertical_above": ["\u0682"],
+             "three_dots_above": ["\u0685"],
+             "two_dots_above": ["\u0757"],
+             "three_dots_pointing_upwards_below": ["\u0758"],
+             "small_tah_below": ["\u076E"],
+             "small_tah_two_dots": ["\u076F"],
+             "small_tah_above": ["\u0772"],
+             "indic_four_below": ["\u077C"],
+             "isolated": "\uFEA1",
+             "final": "\uFEA2",
+             "initial": "\uFEA3",
+             "medial": "\uFEA4"
+           },
+           "khah": {
+             "normal": ["\u062E"],
+             "isolated": "\uFEA5",
+             "final": "\uFEA6",
+             "initial": "\uFEA7",
+             "medial": "\uFEA8"
+           },
+           "dal": {
+             "normal": ["\u062F"],
+             "ring": ["\u0689"],
+             "dot_below": ["\u068A"],
+             "dot_below_small_tah": ["\u068B"],
+             "three_dots_above_downwards": ["\u068F"],
+             "four_dots_above": ["\u0690"],
+             "inverted_v": ["\u06EE"],
+             "two_dots_vertically_below_small_tah": ["\u0759"],
+             "inverted_small_v_below": ["\u075A"],
+             "three_dots_below": ["\u08AE"],
+             "isolated": "\uFEA9",
+             "final": "\uFEAA"
+           },
+           "thal": {
+             "normal": ["\u0630"],
+             "isolated": "\uFEAB",
+             "final": "\uFEAC"
+           },
+           "reh": {
+             "normal": ["\u0631"],
+             "small_v": ["\u0692"],
+             "ring": ["\u0693"],
+             "dot_below": ["\u0694"],
+             "small_v_below": ["\u0695"],
+             "dot_below_dot_above": ["\u0696"],
+             "two_dots_above": ["\u0697"],
+             "four_dots_above": ["\u0699"],
+             "inverted_v": ["\u06EF"],
+             "stroke": ["\u075B"],
+             "two_dots_vertically_above": ["\u076B"],
+             "hamza_above": ["\u076C"],
+             "small_tah_two_dots": ["\u0771"],
+             "loop": ["\u08AA"],
+             "small_noon_above": ["\u08B9"],
+             "isolated": "\uFEAD",
+             "final": "\uFEAE"
+           },
+           "zain": {
+             "normal": ["\u0632"],
+             "inverted_v_above": ["\u08B2"],
+             "isolated": "\uFEAF",
+             "final": "\uFEB0"
+           },
+           "seen": {
+             "normal": ["\u0633"],
+             "dot_below_dot_above": ["\u069A"],
+             "three_dots_below": ["\u069B"],
+             "three_dots_below_three_dots_above": ["\u069C"],
+             "four_dots_above": ["\u075C"],
+             "two_dots_vertically_above": ["\u076D"],
+             "small_tah_two_dots": ["\u0770"],
+             "indic_four_above": ["\u077D"],
+             "inverted_v": ["\u077E"],
+             "isolated": "\uFEB1",
+             "final": "\uFEB2",
+             "initial": "\uFEB3",
+             "medial": "\uFEB4"
+           },
+           "sheen": {
+             "normal": ["\u0634"],
+             "dot_below": ["\u06FA"],
+             "isolated": "\uFEB5",
+             "final": "\uFEB6",
+             "initial": "\uFEB7",
+             "medial": "\uFEB8"
+           },
+           "sad": {
+             "normal": ["\u0635"],
+             "two_dots_below": ["\u069D"],
+             "three_dots_above": ["\u069E"],
+             "three_dots_below": ["\u08AF"],
+             "isolated": "\uFEB9",
+             "final": "\uFEBA",
+             "initial": "\uFEBB",
+             "medial": "\uFEBC"
+           },
+           "dad": {
+             "normal": ["\u0636"],
+             "dot_below": ["\u06FB"],
+             "isolated": "\uFEBD",
+             "final": "\uFEBE",
+             "initial": "\uFEBF",
+             "medial": "\uFEC0"
+           },
+           "tah": {
+             "normal": ["\u0637"],
+             "three_dots_above": ["\u069F"],
+             "two_dots_above": ["\u08A3"],
+             "isolated": "\uFEC1",
+             "final": "\uFEC2",
+             "initial": "\uFEC3",
+             "medial": "\uFEC4"
+           },
+           "zah": {
+             "normal": ["\u0638"],
+             "isolated": "\uFEC5",
+             "final": "\uFEC6",
+             "initial": "\uFEC7",
+             "medial": "\uFEC8"
+           },
+           "ain": {
+             "normal": ["\u0639"],
+             "three_dots_above": ["\u06A0"],
+             "two_dots_above": ["\u075D"],
+             "three_dots_pointing_downwards_above": ["\u075E"],
+             "two_dots_vertically_above": ["\u075F"],
+             "three_dots_below": ["\u08B3"],
+             "isolated": "\uFEC9",
+             "final": "\uFECA",
+             "initial": "\uFECB",
+             "medial": "\uFECC"
+           },
+           "ghain": {
+             "normal": ["\u063A"],
+             "dot_below": ["\u06FC"],
+             "isolated": "\uFECD",
+             "final": "\uFECE",
+             "initial": "\uFECF",
+             "medial": "\uFED0"
+           },
+           "feh": {
+             "normal": ["\u0641"],
+             "dotless": ["\u06A1"],
+             "dot_moved_below": ["\u06A2"],
+             "dot_below": ["\u06A3"],
+             "three_dots_below": ["\u06A5"],
+             "two_dots_below": ["\u0760"],
+             "three_dots_pointing_upwards_below": ["\u0761"],
+             "dot_below_three_dots_above": ["\u08A4"],
+             "isolated": "\uFED1",
+             "final": "\uFED2",
+             "initial": "\uFED3",
+             "medial": "\uFED4"
+           },
+           "qaf": {
+             "normal": ["\u0642"],
+             "dotless": ["\u066F"],
+             "dot_above": ["\u06A7"],
+             "three_dots_above": ["\u06A8"],
+             "dot_below": ["\u08A5"],
+             "isolated": "\uFED5",
+             "final": "\uFED6",
+             "initial": "\uFED7",
+             "medial": "\uFED8"
+           },
+           "kaf": {
+             "normal": ["\u0643"],
+             "swash": ["\u06AA"],
+             "ring": ["\u06AB"],
+             "dot_above": ["\u06AC"],
+             "three_dots_below": ["\u06AE"],
+             "two_dots_above": ["\u077F"],
+             "dot_below": ["\u08B4"],
+             "isolated": "\uFED9",
+             "final": "\uFEDA",
+             "initial": "\uFEDB",
+             "medial": "\uFEDC"
+           },
+           "lam": {
+             "normal": ["\u0644"],
+             "small_v": ["\u06B5"],
+             "dot_above": ["\u06B6"],
+             "three_dots_above": ["\u06B7"],
+             "three_dots_below": ["\u06B8"],
+             "bar": ["\u076A"],
+             "double_bar": ["\u08A6"],
+             "isolated": "\uFEDD",
+             "final": "\uFEDE",
+             "initial": "\uFEDF",
+             "medial": "\uFEE0"
+           },
+           "meem": {
+             "normal": ["\u0645"],
+             "dot_above": ["\u0765"],
+             "dot_below": ["\u0766"],
+             "three_dots_above": ["\u08A7"],
+             "isolated": "\uFEE1",
+             "final": "\uFEE2",
+             "initial": "\uFEE3",
+             "medial": "\uFEE4"
+           },
+           "noon": {
+             "normal": ["\u0646"],
+             "dot_below": ["\u06B9"],
+             "ring": ["\u06BC"],
+             "three_dots_above": ["\u06BD"],
+             "two_dots_below": ["\u0767"],
+             "small_tah": ["\u0768"],
+             "small_v": ["\u0769"],
+             "isolated": "\uFEE5",
+             "final": "\uFEE6",
+             "initial": "\uFEE7",
+             "medial": "\uFEE8"
+           },
+           "heh": {
+             "normal": ["\u0647"],
+             "isolated": "\uFEE9",
+             "final": "\uFEEA",
+             "initial": "\uFEEB",
+             "medial": "\uFEEC"
+           },
+           "waw": {
+             "normal": ["\u0648"],
+             "hamza_above": {
+               "normal": ["\u0624", "\u0648\u0654"],
+               "isolated": "\uFE85",
+               "final": "\uFE86"
+             },
+             "high_hamza": ["\u0676", "\u0648\u0674"],
+             "ring": ["\u06C4"],
+             "two_dots_above": ["\u06CA"],
+             "dot_above": ["\u06CF"],
+             "indic_two_above": ["\u0778"],
+             "indic_three_above": ["\u0779"],
+             "dot_within": ["\u08AB"],
+             "isolated": "\uFEED",
+             "final": "\uFEEE"
+           },
+           "alef_maksura": {
+             "normal": ["\u0649"],
+             "hamza_above": ["\u0626", "\u064A\u0654"],
+             "initial": "\uFBE8",
+             "medial": "\uFBE9",
+             "isolated": "\uFEEF",
+             "final": "\uFEF0"
+           },
+           "yeh": {
+             "normal": ["\u064A"],
+             "hamza_above": {
+               "normal": ["\u0626", "\u0649\u0654"],
+               "isolated": "\uFE89",
+               "final": "\uFE8A",
+               "initial": "\uFE8B",
+               "medial": "\uFE8C"
+             },
+             "two_dots_below_hamza_above": ["\u08A8"],
+             "high_hamza": ["\u0678", "\u064A\u0674"],
+             "tail": ["\u06CD"],
+             "small_v": ["\u06CE"],
+             "three_dots_below": ["\u06D1"],
+             "two_dots_below_dot_above": ["\u08A9"],
+             "two_dots_below_small_noon_above": ["\u08BA"],
+             "isolated": "\uFEF1",
+             "final": "\uFEF2",
+             "initial": "\uFEF3",
+             "medial": "\uFEF4"
+           },
+           "tteh": {
+             "normal": ["\u0679"],
+             "isolated": "\uFB66",
+             "final": "\uFB67",
+             "initial": "\uFB68",
+             "medial": "\uFB69"
+           },
+           "tteheh": {
+             "normal": ["\u067A"],
+             "isolated": "\uFB5E",
+             "final": "\uFB5F",
+             "initial": "\uFB60",
+             "medial": "\uFB61"
+           },
+           "beeh": {
+             "normal": ["\u067B"],
+             "isolated": "\uFB52",
+             "final": "\uFB53",
+             "initial": "\uFB54",
+             "medial": "\uFB55"
+           },
+           "peh": {
+             "normal": ["\u067E"],
+             "small_meem_above": ["\u08B7"],
+             "isolated": "\uFB56",
+             "final": "\uFB57",
+             "initial": "\uFB58",
+             "medial": "\uFB59"
+           },
+           "teheh": {
+             "normal": ["\u067F"],
+             "isolated": "\uFB62",
+             "final": "\uFB63",
+             "initial": "\uFB64",
+             "medial": "\uFB65"
+           },
+           "beheh": {
+             "normal": ["\u0680"],
+             "isolated": "\uFB5A",
+             "final": "\uFB5B",
+             "initial": "\uFB5C",
+             "medial": "\uFB5D"
+           },
+           "nyeh": {
+             "normal": ["\u0683"],
+             "isolated": "\uFB76",
+             "final": "\uFB77",
+             "initial": "\uFB78",
+             "medial": "\uFB79"
+           },
+           "dyeh": {
+             "normal": ["\u0684"],
+             "isolated": "\uFB72",
+             "final": "\uFB73",
+             "initial": "\uFB74",
+             "medial": "\uFB75"
+           },
+           "tcheh": {
+             "normal": ["\u0686"],
+             "dot_above": ["\u06BF"],
+             "isolated": "\uFB7A",
+             "final": "\uFB7B",
+             "initial": "\uFB7C",
+             "medial": "\uFB7D"
+           },
+           "tcheheh": {
+             "normal": ["\u0687"],
+             "isolated": "\uFB7E",
+             "final": "\uFB7F",
+             "initial": "\uFB80",
+             "medial": "\uFB81"
+           },
+           "ddal": {
+             "normal": ["\u0688"],
+             "isolated": "\uFB88",
+             "final": "\uFB89"
+           },
+           "dahal": {
+             "normal": ["\u068C"],
+             "isolated": "\uFB84",
+             "final": "\uFB85"
+           },
+           "ddahal": {
+             "normal": ["\u068D"],
+             "isolated": "\uFB82",
+             "final": "\uFB83"
+           },
+           "dul": {
+             "normal": ["\u068F", "\u068E"],
+             "isolated": "\uFB86",
+             "final": "\uFB87"
+           },
+           "rreh": {
+             "normal": ["\u0691"],
+             "isolated": "\uFB8C",
+             "final": "\uFB8D"
+           },
+           "jeh": {
+             "normal": ["\u0698"],
+             "isolated": "\uFB8A",
+             "final": "\uFB8B"
+           },
+           "veh": {
+             "normal": ["\u06A4"],
+             "isolated": "\uFB6A",
+             "final": "\uFB6B",
+             "initial": "\uFB6C",
+             "medial": "\uFB6D"
+           },
+           "peheh": {
+             "normal": ["\u06A6"],
+             "isolated": "\uFB6E",
+             "final": "\uFB6F",
+             "initial": "\uFB70",
+             "medial": "\uFB71"
+           },
+           "keheh": {
+             "normal": ["\u06A9"],
+             "dot_above": ["\u0762"],
+             "three_dots_above": ["\u0763"],
+             "three_dots_pointing_upwards_below": ["\u0764"],
+             "isolated": "\uFB8E",
+             "final": "\uFB8F",
+             "initial": "\uFB90",
+             "medial": "\uFB91"
+           },
+           "ng": {
+             "normal": ["\u06AD"],
+             "isolated": "\uFBD3",
+             "final": "\uFBD4",
+             "initial": "\uFBD5",
+             "medial": "\uFBD6"
+           },
+           "gaf": {
+             "normal": ["\u06AF"],
+             "ring": ["\u06B0"],
+             "two_dots_below": ["\u06B2"],
+             "three_dots_above": ["\u06B4"],
+             "inverted_stroke": ["\u08B0"],
+             "isolated": "\uFB92",
+             "final": "\uFB93",
+             "initial": "\uFB94",
+             "medial": "\uFB95"
+           },
+           "ngoeh": {
+             "normal": ["\u06B1"],
+             "isolated": "\uFB9A",
+             "final": "\uFB9B",
+             "initial": "\uFB9C",
+             "medial": "\uFB9D"
+           },
+           "gueh": {
+             "normal": ["\u06B3"],
+             "isolated": "\uFB96",
+             "final": "\uFB97",
+             "initial": "\uFB98",
+             "medial": "\uFB99"
+           },
+           "noon ghunna": {
+             "normal": ["\u06BA"],
+             "isolated": "\uFB9E",
+             "final": "\uFB9F"
+           },
+           "rnoon": {
+             "normal": ["\u06BB"],
+             "isolated": "\uFBA0",
+             "final": "\uFBA1",
+             "initial": "\uFBA2",
+             "medial": "\uFBA3"
+           },
+           "heh doachashmee": {
+             "normal": ["\u06BE"],
+             "isolated": "\uFBAA",
+             "final": "\uFBAB",
+             "initial": "\uFBAC",
+             "medial": "\uFBAD"
+           },
+           "heh goal": {
+             "normal": ["\u06C1"],
+             "hamza_above": ["\u06C1\u0654", "\u06C2"],
+             "isolated": "\uFBA6",
+             "final": "\uFBA7",
+             "initial": "\uFBA8",
+             "medial": "\uFBA9"
+           },
+           "teh marbuta goal": {
+             "normal": ["\u06C3"]
+           },
+           "kirghiz oe": {
+             "normal": ["\u06C5"],
+             "isolated": "\uFBE0",
+             "final": "\uFBE1"
+           },
+           "oe": {
+             "normal": ["\u06C6"],
+             "isolated": "\uFBD9",
+             "final": "\uFBDA"
+           },
+           "u": {
+             "normal": ["\u06C7"],
+             "hamza_above": {
+               "normal": ["\u0677", "\u06C7\u0674"],
+               "isolated": "\uFBDD"
+             },
+             "isolated": "\uFBD7",
+             "final": "\uFBD8"
+           },
+           "yu": {
+             "normal": ["\u06C8"],
+             "isolated": "\uFBDB",
+             "final": "\uFBDC"
+           },
+           "kirghiz yu": {
+             "normal": ["\u06C9"],
+             "isolated": "\uFBE2",
+             "final": "\uFBE3"
+           },
+           "ve": {
+             "normal": ["\u06CB"],
+             "isolated": "\uFBDE",
+             "final": "\uFBDF"
+           },
+           "farsi yeh": {
+             "normal": ["\u06CC"],
+             "indic_two_above": ["\u0775"],
+             "indic_three_above": ["\u0776"],
+             "indic_four_above": ["\u0777"],
+             "isolated": "\uFBFC",
+             "final": "\uFBFD",
+             "initial": "\uFBFE",
+             "medial": "\uFBFF"
+           },
+           "e": {
+             "normal": ["\u06D0"],
+             "isolated": "\uFBE4",
+             "final": "\uFBE5",
+             "initial": "\uFBE6",
+             "medial": "\uFBE7"
+           },
+           "yeh barree": {
+             "normal": ["\u06D2"],
+             "hamza_above": {
+               "normal": ["\u06D2\u0654", "\u06D3"],
+               "isolated": "\uFBB0",
+               "final": "\uFBB1"
+             },
+             "indic_two_above": ["\u077A"],
+             "indic_three_above": ["\u077B"],
+             "isolated": "\uFBAE",
+             "final": "\uFBAF"
+           },
+           "ae": {
+             "normal": ["\u06D5"],
+             "isolated": "\u06D5",
+             "final": "\uFEEA",
+             "yeh_above": {
+               "normal": ["\u06C0", "\u06D5\u0654"],
+               "isolated": "\uFBA4",
+               "final": "\uFBA5"
              }
-
-             return numerals(value);
+           },
+           "rohingya yeh": {
+             "normal": ["\u08AC"]
+           },
+           "low alef": {
+             "normal": ["\u08AD"]
+           },
+           "straight waw": {
+             "normal": ["\u08B1"]
+           },
+           "african feh": {
+             "normal": ["\u08BB"]
+           },
+           "african qaf": {
+             "normal": ["\u08BC"]
+           },
+           "african noon": {
+             "normal": ["\u08BD"]
            }
-
-           format.toString = function() {
-             return specifier + "";
-           };
-
-           return format;
-         }
-
-         function formatPrefix(specifier, value) {
-           var f = newFormat((specifier = formatSpecifier(specifier), specifier.type = "f", specifier)),
-               e = Math.max(-8, Math.min(8, Math.floor(exponent(value) / 3))) * 3,
-               k = Math.pow(10, -e),
-               prefix = prefixes[8 + e / 3];
-           return function(value) {
-             return f(k * value) + prefix;
-           };
-         }
-
-         return {
-           format: newFormat,
-           formatPrefix: formatPrefix
          };
-       }
+         exports["default"] = arabicReference;
+       });
 
-       var locale;
-       var format;
-       var formatPrefix;
+       var unicodeLigatures = createCommonjsModule(function (module, exports) {
 
-       defaultLocale({
-         decimal: ".",
-         thousands: ",",
-         grouping: [3],
-         currency: ["$", ""],
-         minus: "-"
+         Object.defineProperty(exports, "__esModule", {
+           value: true
+         });
+         var ligatureReference = {
+           "\u0626\u0627": {
+             "isolated": "\uFBEA",
+             "final": "\uFBEB"
+           },
+           "\u0626\u06D5": {
+             "isolated": "\uFBEC",
+             "final": "\uFBED"
+           },
+           "\u0626\u0648": {
+             "isolated": "\uFBEE",
+             "final": "\uFBEF"
+           },
+           "\u0626\u06C7": {
+             "isolated": "\uFBF0",
+             "final": "\uFBF1"
+           },
+           "\u0626\u06C6": {
+             "isolated": "\uFBF2",
+             "final": "\uFBF3"
+           },
+           "\u0626\u06C8": {
+             "isolated": "\uFBF4",
+             "final": "\uFBF5"
+           },
+           "\u0626\u06D0": {
+             "isolated": "\uFBF6",
+             "final": "\uFBF7",
+             "initial": "\uFBF8"
+           },
+           "\u0626\u0649": {
+             "uighur_kirghiz": {
+               "isolated": "\uFBF9",
+               "final": "\uFBFA",
+               "initial": "\uFBFB"
+             },
+             "isolated": "\uFC03",
+             "final": "\uFC68"
+           },
+           "\u0626\u062C": {
+             "isolated": "\uFC00",
+             "initial": "\uFC97"
+           },
+           "\u0626\u062D": {
+             "isolated": "\uFC01",
+             "initial": "\uFC98"
+           },
+           "\u0626\u0645": {
+             "isolated": "\uFC02",
+             "final": "\uFC66",
+             "initial": "\uFC9A",
+             "medial": "\uFCDF"
+           },
+           "\u0626\u064A": {
+             "isolated": "\uFC04",
+             "final": "\uFC69"
+           },
+           "\u0628\u062C": {
+             "isolated": "\uFC05",
+             "initial": "\uFC9C"
+           },
+           "\u0628\u062D": {
+             "isolated": "\uFC06",
+             "initial": "\uFC9D"
+           },
+           "\u0628\u062E": {
+             "isolated": "\uFC07",
+             "initial": "\uFC9E"
+           },
+           "\u0628\u0645": {
+             "isolated": "\uFC08",
+             "final": "\uFC6C",
+             "initial": "\uFC9F",
+             "medial": "\uFCE1"
+           },
+           "\u0628\u0649": {
+             "isolated": "\uFC09",
+             "final": "\uFC6E"
+           },
+           "\u0628\u064A": {
+             "isolated": "\uFC0A",
+             "final": "\uFC6F"
+           },
+           "\u062A\u062C": {
+             "isolated": "\uFC0B",
+             "initial": "\uFCA1"
+           },
+           "\u062A\u062D": {
+             "isolated": "\uFC0C",
+             "initial": "\uFCA2"
+           },
+           "\u062A\u062E": {
+             "isolated": "\uFC0D",
+             "initial": "\uFCA3"
+           },
+           "\u062A\u0645": {
+             "isolated": "\uFC0E",
+             "final": "\uFC72",
+             "initial": "\uFCA4",
+             "medial": "\uFCE3"
+           },
+           "\u062A\u0649": {
+             "isolated": "\uFC0F",
+             "final": "\uFC74"
+           },
+           "\u062A\u064A": {
+             "isolated": "\uFC10",
+             "final": "\uFC75"
+           },
+           "\u062B\u062C": {
+             "isolated": "\uFC11"
+           },
+           "\u062B\u0645": {
+             "isolated": "\uFC12",
+             "final": "\uFC78",
+             "initial": "\uFCA6",
+             "medial": "\uFCE5"
+           },
+           "\u062B\u0649": {
+             "isolated": "\uFC13",
+             "final": "\uFC7A"
+           },
+           "\u062B\u0648": {
+             "isolated": "\uFC14"
+           },
+           "\u062C\u062D": {
+             "isolated": "\uFC15",
+             "initial": "\uFCA7"
+           },
+           "\u062C\u0645": {
+             "isolated": "\uFC16",
+             "initial": "\uFCA8"
+           },
+           "\u062D\u062C": {
+             "isolated": "\uFC17",
+             "initial": "\uFCA9"
+           },
+           "\u062D\u0645": {
+             "isolated": "\uFC18",
+             "initial": "\uFCAA"
+           },
+           "\u062E\u062C": {
+             "isolated": "\uFC19",
+             "initial": "\uFCAB"
+           },
+           "\u062E\u062D": {
+             "isolated": "\uFC1A"
+           },
+           "\u062E\u0645": {
+             "isolated": "\uFC1B",
+             "initial": "\uFCAC"
+           },
+           "\u0633\u062C": {
+             "isolated": "\uFC1C",
+             "initial": "\uFCAD",
+             "medial": "\uFD34"
+           },
+           "\u0633\u062D": {
+             "isolated": "\uFC1D",
+             "initial": "\uFCAE",
+             "medial": "\uFD35"
+           },
+           "\u0633\u062E": {
+             "isolated": "\uFC1E",
+             "initial": "\uFCAF",
+             "medial": "\uFD36"
+           },
+           "\u0633\u0645": {
+             "isolated": "\uFC1F",
+             "initial": "\uFCB0",
+             "medial": "\uFCE7"
+           },
+           "\u0635\u062D": {
+             "isolated": "\uFC20",
+             "initial": "\uFCB1"
+           },
+           "\u0635\u0645": {
+             "isolated": "\uFC21",
+             "initial": "\uFCB3"
+           },
+           "\u0636\u062C": {
+             "isolated": "\uFC22",
+             "initial": "\uFCB4"
+           },
+           "\u0636\u062D": {
+             "isolated": "\uFC23",
+             "initial": "\uFCB5"
+           },
+           "\u0636\u062E": {
+             "isolated": "\uFC24",
+             "initial": "\uFCB6"
+           },
+           "\u0636\u0645": {
+             "isolated": "\uFC25",
+             "initial": "\uFCB7"
+           },
+           "\u0637\u062D": {
+             "isolated": "\uFC26",
+             "initial": "\uFCB8"
+           },
+           "\u0637\u0645": {
+             "isolated": "\uFC27",
+             "initial": "\uFD33",
+             "medial": "\uFD3A"
+           },
+           "\u0638\u0645": {
+             "isolated": "\uFC28",
+             "initial": "\uFCB9",
+             "medial": "\uFD3B"
+           },
+           "\u0639\u062C": {
+             "isolated": "\uFC29",
+             "initial": "\uFCBA"
+           },
+           "\u0639\u0645": {
+             "isolated": "\uFC2A",
+             "initial": "\uFCBB"
+           },
+           "\u063A\u062C": {
+             "isolated": "\uFC2B",
+             "initial": "\uFCBC"
+           },
+           "\u063A\u0645": {
+             "isolated": "\uFC2C",
+             "initial": "\uFCBD"
+           },
+           "\u0641\u062C": {
+             "isolated": "\uFC2D",
+             "initial": "\uFCBE"
+           },
+           "\u0641\u062D": {
+             "isolated": "\uFC2E",
+             "initial": "\uFCBF"
+           },
+           "\u0641\u062E": {
+             "isolated": "\uFC2F",
+             "initial": "\uFCC0"
+           },
+           "\u0641\u0645": {
+             "isolated": "\uFC30",
+             "initial": "\uFCC1"
+           },
+           "\u0641\u0649": {
+             "isolated": "\uFC31",
+             "final": "\uFC7C"
+           },
+           "\u0641\u064A": {
+             "isolated": "\uFC32",
+             "final": "\uFC7D"
+           },
+           "\u0642\u062D": {
+             "isolated": "\uFC33",
+             "initial": "\uFCC2"
+           },
+           "\u0642\u0645": {
+             "isolated": "\uFC34",
+             "initial": "\uFCC3"
+           },
+           "\u0642\u0649": {
+             "isolated": "\uFC35",
+             "final": "\uFC7E"
+           },
+           "\u0642\u064A": {
+             "isolated": "\uFC36",
+             "final": "\uFC7F"
+           },
+           "\u0643\u0627": {
+             "isolated": "\uFC37",
+             "final": "\uFC80"
+           },
+           "\u0643\u062C": {
+             "isolated": "\uFC38",
+             "initial": "\uFCC4"
+           },
+           "\u0643\u062D": {
+             "isolated": "\uFC39",
+             "initial": "\uFCC5"
+           },
+           "\u0643\u062E": {
+             "isolated": "\uFC3A",
+             "initial": "\uFCC6"
+           },
+           "\u0643\u0644": {
+             "isolated": "\uFC3B",
+             "final": "\uFC81",
+             "initial": "\uFCC7",
+             "medial": "\uFCEB"
+           },
+           "\u0643\u0645": {
+             "isolated": "\uFC3C",
+             "final": "\uFC82",
+             "initial": "\uFCC8",
+             "medial": "\uFCEC"
+           },
+           "\u0643\u0649": {
+             "isolated": "\uFC3D",
+             "final": "\uFC83"
+           },
+           "\u0643\u064A": {
+             "isolated": "\uFC3E",
+             "final": "\uFC84"
+           },
+           "\u0644\u062C": {
+             "isolated": "\uFC3F",
+             "initial": "\uFCC9"
+           },
+           "\u0644\u062D": {
+             "isolated": "\uFC40",
+             "initial": "\uFCCA"
+           },
+           "\u0644\u062E": {
+             "isolated": "\uFC41",
+             "initial": "\uFCCB"
+           },
+           "\u0644\u0645": {
+             "isolated": "\uFC42",
+             "final": "\uFC85",
+             "initial": "\uFCCC",
+             "medial": "\uFCED"
+           },
+           "\u0644\u0649": {
+             "isolated": "\uFC43",
+             "final": "\uFC86"
+           },
+           "\u0644\u064A": {
+             "isolated": "\uFC44",
+             "final": "\uFC87"
+           },
+           "\u0645\u062C": {
+             "isolated": "\uFC45",
+             "initial": "\uFCCE"
+           },
+           "\u0645\u062D": {
+             "isolated": "\uFC46",
+             "initial": "\uFCCF"
+           },
+           "\u0645\u062E": {
+             "isolated": "\uFC47",
+             "initial": "\uFCD0"
+           },
+           "\u0645\u0645": {
+             "isolated": "\uFC48",
+             "final": "\uFC89",
+             "initial": "\uFCD1"
+           },
+           "\u0645\u0649": {
+             "isolated": "\uFC49"
+           },
+           "\u0645\u064A": {
+             "isolated": "\uFC4A"
+           },
+           "\u0646\u062C": {
+             "isolated": "\uFC4B",
+             "initial": "\uFCD2"
+           },
+           "\u0646\u062D": {
+             "isolated": "\uFC4C",
+             "initial": "\uFCD3"
+           },
+           "\u0646\u062E": {
+             "isolated": "\uFC4D",
+             "initial": "\uFCD4"
+           },
+           "\u0646\u0645": {
+             "isolated": "\uFC4E",
+             "final": "\uFC8C",
+             "initial": "\uFCD5",
+             "medial": "\uFCEE"
+           },
+           "\u0646\u0649": {
+             "isolated": "\uFC4F",
+             "final": "\uFC8E"
+           },
+           "\u0646\u064A": {
+             "isolated": "\uFC50",
+             "final": "\uFC8F"
+           },
+           "\u0647\u062C": {
+             "isolated": "\uFC51",
+             "initial": "\uFCD7"
+           },
+           "\u0647\u0645": {
+             "isolated": "\uFC52",
+             "initial": "\uFCD8"
+           },
+           "\u0647\u0649": {
+             "isolated": "\uFC53"
+           },
+           "\u0647\u064A": {
+             "isolated": "\uFC54"
+           },
+           "\u064A\u062C": {
+             "isolated": "\uFC55",
+             "initial": "\uFCDA"
+           },
+           "\u064A\u062D": {
+             "isolated": "\uFC56",
+             "initial": "\uFCDB"
+           },
+           "\u064A\u062E": {
+             "isolated": "\uFC57",
+             "initial": "\uFCDC"
+           },
+           "\u064A\u0645": {
+             "isolated": "\uFC58",
+             "final": "\uFC93",
+             "initial": "\uFCDD",
+             "medial": "\uFCF0"
+           },
+           "\u064A\u0649": {
+             "isolated": "\uFC59",
+             "final": "\uFC95"
+           },
+           "\u064A\u064A": {
+             "isolated": "\uFC5A",
+             "final": "\uFC96"
+           },
+           "\u0630\u0670": {
+             "isolated": "\uFC5B"
+           },
+           "\u0631\u0670": {
+             "isolated": "\uFC5C"
+           },
+           "\u0649\u0670": {
+             "isolated": "\uFC5D",
+             "final": "\uFC90"
+           },
+           "\u064C\u0651": {
+             "isolated": "\uFC5E"
+           },
+           "\u064D\u0651": {
+             "isolated": "\uFC5F"
+           },
+           "\u064E\u0651": {
+             "isolated": "\uFC60"
+           },
+           "\u064F\u0651": {
+             "isolated": "\uFC61"
+           },
+           "\u0650\u0651": {
+             "isolated": "\uFC62"
+           },
+           "\u0651\u0670": {
+             "isolated": "\uFC63"
+           },
+           "\u0626\u0631": {
+             "final": "\uFC64"
+           },
+           "\u0626\u0632": {
+             "final": "\uFC65"
+           },
+           "\u0626\u0646": {
+             "final": "\uFC67"
+           },
+           "\u0628\u0631": {
+             "final": "\uFC6A"
+           },
+           "\u0628\u0632": {
+             "final": "\uFC6B"
+           },
+           "\u0628\u0646": {
+             "final": "\uFC6D"
+           },
+           "\u062A\u0631": {
+             "final": "\uFC70"
+           },
+           "\u062A\u0632": {
+             "final": "\uFC71"
+           },
+           "\u062A\u0646": {
+             "final": "\uFC73"
+           },
+           "\u062B\u0631": {
+             "final": "\uFC76"
+           },
+           "\u062B\u0632": {
+             "final": "\uFC77"
+           },
+           "\u062B\u0646": {
+             "final": "\uFC79"
+           },
+           "\u062B\u064A": {
+             "final": "\uFC7B"
+           },
+           "\u0645\u0627": {
+             "final": "\uFC88"
+           },
+           "\u0646\u0631": {
+             "final": "\uFC8A"
+           },
+           "\u0646\u0632": {
+             "final": "\uFC8B"
+           },
+           "\u0646\u0646": {
+             "final": "\uFC8D"
+           },
+           "\u064A\u0631": {
+             "final": "\uFC91"
+           },
+           "\u064A\u0632": {
+             "final": "\uFC92"
+           },
+           "\u064A\u0646": {
+             "final": "\uFC94"
+           },
+           "\u0626\u062E": {
+             "initial": "\uFC99"
+           },
+           "\u0626\u0647": {
+             "initial": "\uFC9B",
+             "medial": "\uFCE0"
+           },
+           "\u0628\u0647": {
+             "initial": "\uFCA0",
+             "medial": "\uFCE2"
+           },
+           "\u062A\u0647": {
+             "initial": "\uFCA5",
+             "medial": "\uFCE4"
+           },
+           "\u0635\u062E": {
+             "initial": "\uFCB2"
+           },
+           "\u0644\u0647": {
+             "initial": "\uFCCD"
+           },
+           "\u0646\u0647": {
+             "initial": "\uFCD6",
+             "medial": "\uFCEF"
+           },
+           "\u0647\u0670": {
+             "initial": "\uFCD9"
+           },
+           "\u064A\u0647": {
+             "initial": "\uFCDE",
+             "medial": "\uFCF1"
+           },
+           "\u062B\u0647": {
+             "medial": "\uFCE6"
+           },
+           "\u0633\u0647": {
+             "medial": "\uFCE8",
+             "initial": "\uFD31"
+           },
+           "\u0634\u0645": {
+             "medial": "\uFCE9",
+             "isolated": "\uFD0C",
+             "final": "\uFD28",
+             "initial": "\uFD30"
+           },
+           "\u0634\u0647": {
+             "medial": "\uFCEA",
+             "initial": "\uFD32"
+           },
+           "\u0640\u064E\u0651": {
+             "medial": "\uFCF2"
+           },
+           "\u0640\u064F\u0651": {
+             "medial": "\uFCF3"
+           },
+           "\u0640\u0650\u0651": {
+             "medial": "\uFCF4"
+           },
+           "\u0637\u0649": {
+             "isolated": "\uFCF5",
+             "final": "\uFD11"
+           },
+           "\u0637\u064A": {
+             "isolated": "\uFCF6",
+             "final": "\uFD12"
+           },
+           "\u0639\u0649": {
+             "isolated": "\uFCF7",
+             "final": "\uFD13"
+           },
+           "\u0639\u064A": {
+             "isolated": "\uFCF8",
+             "final": "\uFD14"
+           },
+           "\u063A\u0649": {
+             "isolated": "\uFCF9",
+             "final": "\uFD15"
+           },
+           "\u063A\u064A": {
+             "isolated": "\uFCFA",
+             "final": "\uFD16"
+           },
+           "\u0633\u0649": {
+             "isolated": "\uFCFB"
+           },
+           "\u0633\u064A": {
+             "isolated": "\uFCFC",
+             "final": "\uFD18"
+           },
+           "\u0634\u0649": {
+             "isolated": "\uFCFD",
+             "final": "\uFD19"
+           },
+           "\u0634\u064A": {
+             "isolated": "\uFCFE",
+             "final": "\uFD1A"
+           },
+           "\u062D\u0649": {
+             "isolated": "\uFCFF",
+             "final": "\uFD1B"
+           },
+           "\u062D\u064A": {
+             "isolated": "\uFD00",
+             "final": "\uFD1C"
+           },
+           "\u062C\u0649": {
+             "isolated": "\uFD01",
+             "final": "\uFD1D"
+           },
+           "\u062C\u064A": {
+             "isolated": "\uFD02",
+             "final": "\uFD1E"
+           },
+           "\u062E\u0649": {
+             "isolated": "\uFD03",
+             "final": "\uFD1F"
+           },
+           "\u062E\u064A": {
+             "isolated": "\uFD04",
+             "final": "\uFD20"
+           },
+           "\u0635\u0649": {
+             "isolated": "\uFD05",
+             "final": "\uFD21"
+           },
+           "\u0635\u064A": {
+             "isolated": "\uFD06",
+             "final": "\uFD22"
+           },
+           "\u0636\u0649": {
+             "isolated": "\uFD07",
+             "final": "\uFD23"
+           },
+           "\u0636\u064A": {
+             "isolated": "\uFD08",
+             "final": "\uFD24"
+           },
+           "\u0634\u062C": {
+             "isolated": "\uFD09",
+             "final": "\uFD25",
+             "initial": "\uFD2D",
+             "medial": "\uFD37"
+           },
+           "\u0634\u062D": {
+             "isolated": "\uFD0A",
+             "final": "\uFD26",
+             "initial": "\uFD2E",
+             "medial": "\uFD38"
+           },
+           "\u0634\u062E": {
+             "isolated": "\uFD0B",
+             "final": "\uFD27",
+             "initial": "\uFD2F",
+             "medial": "\uFD39"
+           },
+           "\u0634\u0631": {
+             "isolated": "\uFD0D",
+             "final": "\uFD29"
+           },
+           "\u0633\u0631": {
+             "isolated": "\uFD0E",
+             "final": "\uFD2A"
+           },
+           "\u0635\u0631": {
+             "isolated": "\uFD0F",
+             "final": "\uFD2B"
+           },
+           "\u0636\u0631": {
+             "isolated": "\uFD10",
+             "final": "\uFD2C"
+           },
+           "\u0633\u0639": {
+             "final": "\uFD17"
+           },
+           "\u062A\u062C\u0645": {
+             "initial": "\uFD50"
+           },
+           "\u062A\u062D\u062C": {
+             "final": "\uFD51",
+             "initial": "\uFD52"
+           },
+           "\u062A\u062D\u0645": {
+             "initial": "\uFD53"
+           },
+           "\u062A\u062E\u0645": {
+             "initial": "\uFD54"
+           },
+           "\u062A\u0645\u062C": {
+             "initial": "\uFD55"
+           },
+           "\u062A\u0645\u062D": {
+             "initial": "\uFD56"
+           },
+           "\u062A\u0645\u062E": {
+             "initial": "\uFD57"
+           },
+           "\u062C\u0645\u062D": {
+             "final": "\uFD58",
+             "initial": "\uFD59"
+           },
+           "\u062D\u0645\u064A": {
+             "final": "\uFD5A"
+           },
+           "\u062D\u0645\u0649": {
+             "final": "\uFD5B"
+           },
+           "\u0633\u062D\u062C": {
+             "initial": "\uFD5C"
+           },
+           "\u0633\u062C\u062D": {
+             "initial": "\uFD5D"
+           },
+           "\u0633\u062C\u0649": {
+             "final": "\uFD5E"
+           },
+           "\u0633\u0645\u062D": {
+             "final": "\uFD5F",
+             "initial": "\uFD60"
+           },
+           "\u0633\u0645\u062C": {
+             "initial": "\uFD61"
+           },
+           "\u0633\u0645\u0645": {
+             "final": "\uFD62",
+             "initial": "\uFD63"
+           },
+           "\u0635\u062D\u062D": {
+             "final": "\uFD64",
+             "initial": "\uFD65"
+           },
+           "\u0635\u0645\u0645": {
+             "final": "\uFD66",
+             "initial": "\uFDC5"
+           },
+           "\u0634\u062D\u0645": {
+             "final": "\uFD67",
+             "initial": "\uFD68"
+           },
+           "\u0634\u062C\u064A": {
+             "final": "\uFD69"
+           },
+           "\u0634\u0645\u062E": {
+             "final": "\uFD6A",
+             "initial": "\uFD6B"
+           },
+           "\u0634\u0645\u0645": {
+             "final": "\uFD6C",
+             "initial": "\uFD6D"
+           },
+           "\u0636\u062D\u0649": {
+             "final": "\uFD6E"
+           },
+           "\u0636\u062E\u0645": {
+             "final": "\uFD6F",
+             "initial": "\uFD70"
+           },
+           "\u0636\u0645\u062D": {
+             "final": "\uFD71"
+           },
+           "\u0637\u0645\u062D": {
+             "initial": "\uFD72"
+           },
+           "\u0637\u0645\u0645": {
+             "initial": "\uFD73"
+           },
+           "\u0637\u0645\u064A": {
+             "final": "\uFD74"
+           },
+           "\u0639\u062C\u0645": {
+             "final": "\uFD75",
+             "initial": "\uFDC4"
+           },
+           "\u0639\u0645\u0645": {
+             "final": "\uFD76",
+             "initial": "\uFD77"
+           },
+           "\u0639\u0645\u0649": {
+             "final": "\uFD78"
+           },
+           "\u063A\u0645\u0645": {
+             "final": "\uFD79"
+           },
+           "\u063A\u0645\u064A": {
+             "final": "\uFD7A"
+           },
+           "\u063A\u0645\u0649": {
+             "final": "\uFD7B"
+           },
+           "\u0641\u062E\u0645": {
+             "final": "\uFD7C",
+             "initial": "\uFD7D"
+           },
+           "\u0642\u0645\u062D": {
+             "final": "\uFD7E",
+             "initial": "\uFDB4"
+           },
+           "\u0642\u0645\u0645": {
+             "final": "\uFD7F"
+           },
+           "\u0644\u062D\u0645": {
+             "final": "\uFD80",
+             "initial": "\uFDB5"
+           },
+           "\u0644\u062D\u064A": {
+             "final": "\uFD81"
+           },
+           "\u0644\u062D\u0649": {
+             "final": "\uFD82"
+           },
+           "\u0644\u062C\u062C": {
+             "initial": "\uFD83",
+             "final": "\uFD84"
+           },
+           "\u0644\u062E\u0645": {
+             "final": "\uFD85",
+             "initial": "\uFD86"
+           },
+           "\u0644\u0645\u062D": {
+             "final": "\uFD87",
+             "initial": "\uFD88"
+           },
+           "\u0645\u062D\u062C": {
+             "initial": "\uFD89"
+           },
+           "\u0645\u062D\u0645": {
+             "initial": "\uFD8A"
+           },
+           "\u0645\u062D\u064A": {
+             "final": "\uFD8B"
+           },
+           "\u0645\u062C\u062D": {
+             "initial": "\uFD8C"
+           },
+           "\u0645\u062C\u0645": {
+             "initial": "\uFD8D"
+           },
+           "\u0645\u062E\u062C": {
+             "initial": "\uFD8E"
+           },
+           "\u0645\u062E\u0645": {
+             "initial": "\uFD8F"
+           },
+           "\u0645\u062C\u062E": {
+             "initial": "\uFD92"
+           },
+           "\u0647\u0645\u062C": {
+             "initial": "\uFD93"
+           },
+           "\u0647\u0645\u0645": {
+             "initial": "\uFD94"
+           },
+           "\u0646\u062D\u0645": {
+             "initial": "\uFD95"
+           },
+           "\u0646\u062D\u0649": {
+             "final": "\uFD96"
+           },
+           "\u0646\u062C\u0645": {
+             "final": "\uFD97",
+             "initial": "\uFD98"
+           },
+           "\u0646\u062C\u0649": {
+             "final": "\uFD99"
+           },
+           "\u0646\u0645\u064A": {
+             "final": "\uFD9A"
+           },
+           "\u0646\u0645\u0649": {
+             "final": "\uFD9B"
+           },
+           "\u064A\u0645\u0645": {
+             "final": "\uFD9C",
+             "initial": "\uFD9D"
+           },
+           "\u0628\u062E\u064A": {
+             "final": "\uFD9E"
+           },
+           "\u062A\u062C\u064A": {
+             "final": "\uFD9F"
+           },
+           "\u062A\u062C\u0649": {
+             "final": "\uFDA0"
+           },
+           "\u062A\u062E\u064A": {
+             "final": "\uFDA1"
+           },
+           "\u062A\u062E\u0649": {
+             "final": "\uFDA2"
+           },
+           "\u062A\u0645\u064A": {
+             "final": "\uFDA3"
+           },
+           "\u062A\u0645\u0649": {
+             "final": "\uFDA4"
+           },
+           "\u062C\u0645\u064A": {
+             "final": "\uFDA5"
+           },
+           "\u062C\u062D\u0649": {
+             "final": "\uFDA6"
+           },
+           "\u062C\u0645\u0649": {
+             "final": "\uFDA7"
+           },
+           "\u0633\u062E\u0649": {
+             "final": "\uFDA8"
+           },
+           "\u0635\u062D\u064A": {
+             "final": "\uFDA9"
+           },
+           "\u0634\u062D\u064A": {
+             "final": "\uFDAA"
+           },
+           "\u0636\u062D\u064A": {
+             "final": "\uFDAB"
+           },
+           "\u0644\u062C\u064A": {
+             "final": "\uFDAC"
+           },
+           "\u0644\u0645\u064A": {
+             "final": "\uFDAD"
+           },
+           "\u064A\u062D\u064A": {
+             "final": "\uFDAE"
+           },
+           "\u064A\u062C\u064A": {
+             "final": "\uFDAF"
+           },
+           "\u064A\u0645\u064A": {
+             "final": "\uFDB0"
+           },
+           "\u0645\u0645\u064A": {
+             "final": "\uFDB1"
+           },
+           "\u0642\u0645\u064A": {
+             "final": "\uFDB2"
+           },
+           "\u0646\u062D\u064A": {
+             "final": "\uFDB3"
+           },
+           "\u0639\u0645\u064A": {
+             "final": "\uFDB6"
+           },
+           "\u0643\u0645\u064A": {
+             "final": "\uFDB7"
+           },
+           "\u0646\u062C\u062D": {
+             "initial": "\uFDB8",
+             "final": "\uFDBD"
+           },
+           "\u0645\u062E\u064A": {
+             "final": "\uFDB9"
+           },
+           "\u0644\u062C\u0645": {
+             "initial": "\uFDBA",
+             "final": "\uFDBC"
+           },
+           "\u0643\u0645\u0645": {
+             "final": "\uFDBB",
+             "initial": "\uFDC3"
+           },
+           "\u062C\u062D\u064A": {
+             "final": "\uFDBE"
+           },
+           "\u062D\u062C\u064A": {
+             "final": "\uFDBF"
+           },
+           "\u0645\u062C\u064A": {
+             "final": "\uFDC0"
+           },
+           "\u0641\u0645\u064A": {
+             "final": "\uFDC1"
+           },
+           "\u0628\u062D\u064A": {
+             "final": "\uFDC2"
+           },
+           "\u0633\u062E\u064A": {
+             "final": "\uFDC6"
+           },
+           "\u0646\u062C\u064A": {
+             "final": "\uFDC7"
+           },
+           "\u0644\u0622": {
+             "isolated": "\uFEF5",
+             "final": "\uFEF6"
+           },
+           "\u0644\u0623": {
+             "isolated": "\uFEF7",
+             "final": "\uFEF8"
+           },
+           "\u0644\u0625": {
+             "isolated": "\uFEF9",
+             "final": "\uFEFA"
+           },
+           "\u0644\u0627": {
+             "isolated": "\uFEFB",
+             "final": "\uFEFC"
+           },
+           "words": {
+             "\u0635\u0644\u06D2": "\uFDF0",
+             "\u0642\u0644\u06D2": "\uFDF1",
+             "\u0627\u0644\u0644\u0647": "\uFDF2",
+             "\u0627\u0643\u0628\u0631": "\uFDF3",
+             "\u0645\u062D\u0645\u062F": "\uFDF4",
+             "\u0635\u0644\u0639\u0645": "\uFDF5",
+             "\u0631\u0633\u0648\u0644": "\uFDF6",
+             "\u0639\u0644\u064A\u0647": "\uFDF7",
+             "\u0648\u0633\u0644\u0645": "\uFDF8",
+             "\u0635\u0644\u0649": "\uFDF9",
+             "\u0635\u0644\u0649\u0627\u0644\u0644\u0647\u0639\u0644\u064A\u0647\u0648\u0633\u0644\u0645": "\uFDFA",
+             "\u062C\u0644\u062C\u0644\u0627\u0644\u0647": "\uFDFB",
+             "\u0631\u06CC\u0627\u0644": "\uFDFC"
+           }
+         };
+         exports["default"] = ligatureReference;
        });
 
-       function defaultLocale(definition) {
-         locale = formatLocale(definition);
-         format = locale.format;
-         formatPrefix = locale.formatPrefix;
-         return locale;
-       }
-
-       function precisionFixed(step) {
-         return Math.max(0, -exponent(Math.abs(step)));
-       }
+       var reference = createCommonjsModule(function (module, exports) {
 
-       function precisionPrefix(step, value) {
-         return Math.max(0, Math.max(-8, Math.min(8, Math.floor(exponent(value) / 3))) * 3 - exponent(Math.abs(step)));
-       }
+         Object.defineProperty(exports, "__esModule", {
+           value: true
+         });
+         var letterList = Object.keys(unicodeArabic["default"]);
+         exports.letterList = letterList;
+         var ligatureList = Object.keys(unicodeLigatures["default"]);
+         exports.ligatureList = ligatureList;
+         var ligatureWordList = Object.keys(unicodeLigatures["default"].words);
+         exports.ligatureWordList = ligatureWordList;
+         var lams = "\u0644\u06B5\u06B6\u06B7\u06B8";
+         exports.lams = lams;
+         var alefs = "\u0627\u0622\u0623\u0625\u0671\u0672\u0673\u0675\u0773\u0774";
+         exports.alefs = alefs; // for (var l = 1; l < lams.length; l++) {
+         //   console.log('-');
+         //   for (var a = 0; a < alefs.length; a++) {
+         //     console.log(a + ': ' + lams[l] + alefs[a]);
+         //   }
+         // }
 
-       function precisionRound(step, max) {
-         step = Math.abs(step), max = Math.abs(max) - step;
-         return Math.max(0, exponent(max) - exponent(step)) + 1;
-       }
+         var tashkeel = "\u0605\u0640\u0670\u0674\u06DF\u06E7\u06E8";
+         exports.tashkeel = tashkeel;
 
-       function tickFormat(start, stop, count, specifier) {
-         var step = tickStep(start, stop, count),
-             precision;
-         specifier = formatSpecifier(specifier == null ? ",f" : specifier);
-         switch (specifier.type) {
-           case "s": {
-             var value = Math.max(Math.abs(start), Math.abs(stop));
-             if (specifier.precision == null && !isNaN(precision = precisionPrefix(step, value))) specifier.precision = precision;
-             return formatPrefix(specifier, value);
-           }
-           case "":
-           case "e":
-           case "g":
-           case "p":
-           case "r": {
-             if (specifier.precision == null && !isNaN(precision = precisionRound(step, Math.max(Math.abs(start), Math.abs(stop))))) specifier.precision = precision - (specifier.type === "e");
-             break;
-           }
-           case "f":
-           case "%": {
-             if (specifier.precision == null && !isNaN(precision = precisionFixed(step))) specifier.precision = precision - (specifier.type === "%") * 2;
-             break;
+         function addToTashkeel(start, finish) {
+           for (var i = start; i <= finish; i++) {
+             exports.tashkeel = tashkeel += String.fromCharCode(i);
            }
          }
-         return format(specifier);
-       }
-
-       function linearish(scale) {
-         var domain = scale.domain;
-
-         scale.ticks = function(count) {
-           var d = domain();
-           return ticks(d[0], d[d.length - 1], count == null ? 10 : count);
-         };
-
-         scale.tickFormat = function(count, specifier) {
-           var d = domain();
-           return tickFormat(d[0], d[d.length - 1], count == null ? 10 : count, specifier);
-         };
-
-         scale.nice = function(count) {
-           if (count == null) count = 10;
-
-           var d = domain(),
-               i0 = 0,
-               i1 = d.length - 1,
-               start = d[i0],
-               stop = d[i1],
-               step;
-
-           if (stop < start) {
-             step = start, start = stop, stop = step;
-             step = i0, i0 = i1, i1 = step;
-           }
-
-           step = tickIncrement(start, stop, count);
 
-           if (step > 0) {
-             start = Math.floor(start / step) * step;
-             stop = Math.ceil(stop / step) * step;
-             step = tickIncrement(start, stop, count);
-           } else if (step < 0) {
-             start = Math.ceil(start * step) / step;
-             stop = Math.floor(stop * step) / step;
-             step = tickIncrement(start, stop, count);
-           }
+         addToTashkeel(0x0610, 0x061A);
+         addToTashkeel(0x064B, 0x065F);
+         addToTashkeel(0x06D6, 0x06DC);
+         addToTashkeel(0x06E0, 0x06E4);
+         addToTashkeel(0x06EA, 0x06ED);
+         addToTashkeel(0x08D3, 0x08E1);
+         addToTashkeel(0x08E3, 0x08FF);
+         addToTashkeel(0xFE70, 0xFE7F);
+         var lineBreakers = "\u0627\u0629\u0648\u06C0\u06CF\u06FD\u06FE\u076B\u076C\u0771\u0773\u0774\u0778\u0779\u08E2\u08B1\u08B2\u08B9";
+         exports.lineBreakers = lineBreakers;
 
-           if (step > 0) {
-             d[i0] = Math.floor(start / step) * step;
-             d[i1] = Math.ceil(stop / step) * step;
-             domain(d);
-           } else if (step < 0) {
-             d[i0] = Math.ceil(start * step) / step;
-             d[i1] = Math.floor(stop * step) / step;
-             domain(d);
+         function addToLineBreakers(start, finish) {
+           for (var i = start; i <= finish; i++) {
+             exports.lineBreakers = lineBreakers += String.fromCharCode(i);
            }
-
-           return scale;
-         };
-
-         return scale;
-       }
-
-       function linear$2() {
-         var scale = continuous(identity$3, identity$3);
-
-         scale.copy = function() {
-           return copy$1(scale, linear$2());
-         };
-
-         initRange.apply(scale, arguments);
-
-         return linearish(scale);
-       }
-
-       function quantize() {
-         var x0 = 0,
-             x1 = 1,
-             n = 1,
-             domain = [0.5],
-             range = [0, 1],
-             unknown;
-
-         function scale(x) {
-           return x <= x ? range[bisectRight(domain, x, 0, n)] : unknown;
-         }
-
-         function rescale() {
-           var i = -1;
-           domain = new Array(n);
-           while (++i < n) domain[i] = ((i + 1) * x1 - (i - n) * x0) / (n + 1);
-           return scale;
          }
 
-         scale.domain = function(_) {
-           return arguments.length ? (x0 = +_[0], x1 = +_[1], rescale()) : [x0, x1];
-         };
-
-         scale.range = function(_) {
-           return arguments.length ? (n = (range = slice$4.call(_)).length - 1, rescale()) : range.slice();
-         };
-
-         scale.invertExtent = function(y) {
-           var i = range.indexOf(y);
-           return i < 0 ? [NaN, NaN]
-               : i < 1 ? [x0, domain[0]]
-               : i >= n ? [domain[n - 1], x1]
-               : [domain[i - 1], domain[i]];
-         };
-
-         scale.unknown = function(_) {
-           return arguments.length ? (unknown = _, scale) : scale;
-         };
-
-         scale.thresholds = function() {
-           return domain.slice();
-         };
-
-         scale.copy = function() {
-           return quantize()
-               .domain([x0, x1])
-               .range(range)
-               .unknown(unknown);
-         };
-
-         return initRange.apply(linearish(scale), arguments);
-       }
-
-       function behaviorBreathe() {
-           var duration = 800;
-           var steps = 4;
-           var selector = '.selected.shadow, .selected .shadow';
-           var _selected = select(null);
-           var _classed = '';
-           var _params = {};
-           var _done = false;
-           var _timer;
-
-
-           function ratchetyInterpolator(a, b, steps, units) {
-               a = parseFloat(a);
-               b = parseFloat(b);
-               var sample = quantize()
-                   .domain([0, 1])
-                   .range(d3_quantize(d3_interpolateNumber(a, b), steps));
-
-               return function(t) {
-                   return String(sample(t)) + (units || '');
-               };
-           }
-
-
-           function reset(selection) {
-               selection
-                   .style('stroke-opacity', null)
-                   .style('stroke-width', null)
-                   .style('fill-opacity', null)
-                   .style('r', null);
-           }
-
-
-           function setAnimationParams(transition, fromTo) {
-               var toFrom = (fromTo === 'from' ? 'to' : 'from');
-
-               transition
-                   .styleTween('stroke-opacity', function(d) {
-                       return ratchetyInterpolator(
-                           _params[d.id][toFrom].opacity,
-                           _params[d.id][fromTo].opacity,
-                           steps
-                       );
-                   })
-                   .styleTween('stroke-width', function(d) {
-                       return ratchetyInterpolator(
-                           _params[d.id][toFrom].width,
-                           _params[d.id][fromTo].width,
-                           steps,
-                           'px'
-                       );
-                   })
-                   .styleTween('fill-opacity', function(d) {
-                       return ratchetyInterpolator(
-                           _params[d.id][toFrom].opacity,
-                           _params[d.id][fromTo].opacity,
-                           steps
-                       );
-                   })
-                   .styleTween('r', function(d) {
-                       return ratchetyInterpolator(
-                           _params[d.id][toFrom].width,
-                           _params[d.id][fromTo].width,
-                           steps,
-                           'px'
-                       );
-                   });
-           }
-
-
-           function calcAnimationParams(selection) {
-               selection
-                   .call(reset)
-                   .each(function(d) {
-                       var s = select(this);
-                       var tag = s.node().tagName;
-                       var p = {'from': {}, 'to': {}};
-                       var opacity;
-                       var width;
-
-                       // determine base opacity and width
-                       if (tag === 'circle') {
-                           opacity = parseFloat(s.style('fill-opacity') || 0.5);
-                           width = parseFloat(s.style('r') || 15.5);
-                       } else {
-                           opacity = parseFloat(s.style('stroke-opacity') || 0.7);
-                           width = parseFloat(s.style('stroke-width') || 10);
-                       }
-
-                       // calculate from/to interpolation params..
-                       p.tag = tag;
-                       p.from.opacity = opacity * 0.6;
-                       p.to.opacity = opacity * 1.25;
-                       p.from.width = width * 0.7;
-                       p.to.width = width * (tag === 'circle' ? 1.5 : 1);
-                       _params[d.id] = p;
-                   });
-           }
-
-
-           function run(surface, fromTo) {
-               var toFrom = (fromTo === 'from' ? 'to' : 'from');
-               var currSelected = surface.selectAll(selector);
-               var currClassed = surface.attr('class');
-
-               if (_done || currSelected.empty()) {
-                   _selected.call(reset);
-                   _selected = select(null);
-                   return;
-               }
-
-               if (!fastDeepEqual(currSelected.data(), _selected.data()) || currClassed !== _classed) {
-                   _selected.call(reset);
-                   _classed = currClassed;
-                   _selected = currSelected.call(calcAnimationParams);
-               }
-
-               var didCallNextRun = false;
-
-               _selected
-                   .transition()
-                   .duration(duration)
-                   .call(setAnimationParams, fromTo)
-                   .on('end', function() {
-                       // `end` event is called for each selected element, but we want
-                       // it to run only once
-                       if (!didCallNextRun) {
-                           surface.call(run, toFrom);
-                           didCallNextRun = true;
-                       }
-
-                       // if entity was deselected, remove breathe styling
-                       if (!select(this).classed('selected')) {
-                           reset(select(this));
-                       }
-                   });
-           }
-
-           function behavior(surface) {
-               _done = false;
-               _timer = timer(function() {
-                   // wait for elements to actually become selected
-                   if (surface.selectAll(selector).empty()) {
-                       return false;
-                   }
-
-                   surface.call(run, 'from');
-                   _timer.stop();
-                   return true;
-               }, 20);
-           }
-
-           behavior.restartIfNeeded = function(surface) {
-               if (_selected.empty()) {
-                   surface.call(run, 'from');
-                   if (_timer) {
-                       _timer.stop();
-                   }
-               }
-           };
-
-           behavior.off = function() {
-               _done = true;
-               if (_timer) {
-                   _timer.stop();
-               }
-               _selected
-                   .interrupt()
-                   .call(reset);
-           };
+         addToLineBreakers(0x0600, 0x061F); // it's OK to include tashkeel in this range as it is ignored
 
+         addToLineBreakers(0x0621, 0x0625);
+         addToLineBreakers(0x062F, 0x0632);
+         addToLineBreakers(0x0660, 0x066D); // numerals, math
 
-           return behavior;
-       }
+         addToLineBreakers(0x0671, 0x0677);
+         addToLineBreakers(0x0688, 0x0699);
+         addToLineBreakers(0x06C3, 0x06CB);
+         addToLineBreakers(0x06D2, 0x06F9);
+         addToLineBreakers(0x0759, 0x075B);
+         addToLineBreakers(0x08AA, 0x08AE);
+         addToLineBreakers(0xFB50, 0xFDFD); // presentation forms look like they could connect, but never do
+         // Presentation Forms A includes diacritics but they are meant to stand alone
 
-       /* Creates a keybinding behavior for an operation */
-       function behaviorOperation(context) {
-           var _operation;
+         addToLineBreakers(0xFE80, 0xFEFC); // presentation forms look like they could connect, but never do
+         // numerals, math
 
-           function keypress() {
-               // prevent operations during low zoom selection
-               if (!context.map().withinEditableZoom()) return;
+         addToLineBreakers(0x10E60, 0x10E7F);
+         addToLineBreakers(0x1EC70, 0x1ECBF);
+         addToLineBreakers(0x1EE00, 0x1EEFF);
+       });
 
-               event.preventDefault();
-               var disabled = _operation.disabled();
+       var GlyphSplitter_1 = createCommonjsModule(function (module, exports) {
 
-               if (disabled) {
-                   context.ui().flash
-                       .duration(4000)
-                       .iconName('#iD-operation-' + _operation.id)
-                       .iconClass('operation disabled')
-                       .text(_operation.tooltip)();
+         Object.defineProperty(exports, "__esModule", {
+           value: true
+         });
 
+         function GlyphSplitter(word) {
+           var letters = [];
+           var lastLetter = '';
+           word.split('').forEach(function (letter) {
+             if (isArabic_1.isArabic(letter)) {
+               if (reference.tashkeel.indexOf(letter) > -1) {
+                 letters[letters.length - 1] += letter;
+               } else if (lastLetter.length && (reference.lams.indexOf(lastLetter) === 0 && reference.alefs.indexOf(letter) > -1 || reference.lams.indexOf(lastLetter) > 0 && reference.alefs.indexOf(letter) === 0)) {
+                 // valid LA forms
+                 letters[letters.length - 1] += letter;
                } else {
-                   context.ui().flash
-                       .duration(2000)
-                       .iconName('#iD-operation-' + _operation.id)
-                       .iconClass('operation')
-                       .text(_operation.annotation() || _operation.title)();
-
-                   if (_operation.point) _operation.point(null);
-                   _operation();
-               }
-           }
-
-
-           function behavior() {
-               if (_operation && _operation.available()) {
-                   context.keybinding()
-                       .on(_operation.keys, keypress);
+                 letters.push(letter);
                }
+             } else {
+               letters.push(letter);
+             }
 
-               return behavior;
-           }
-
-
-           behavior.off = function() {
-               context.keybinding()
-                   .off(_operation.keys);
-           };
-
-
-           behavior.which = function (_) {
-               if (!arguments.length) return _operation;
-               _operation = _;
-               return behavior;
-           };
-
-
-           return behavior;
-       }
-
-       function operationCircularize(context, selectedIDs) {
-           var _extent;
-           var _actions = selectedIDs.map(getAction).filter(Boolean);
-           var _amount = _actions.length === 1 ? 'single' : 'multiple';
-           var _coords = utilGetAllNodes(selectedIDs, context.graph())
-               .map(function(n) { return n.loc; });
+             if (reference.tashkeel.indexOf(letter) === -1) {
+               lastLetter = letter;
+             }
+           });
+           return letters;
+         }
 
-           function getAction(entityID) {
+         exports.GlyphSplitter = GlyphSplitter;
+       });
 
-               var entity = context.entity(entityID);
+       var BaselineSplitter_1 = createCommonjsModule(function (module, exports) {
 
-               if (entity.type !== 'way' || new Set(entity.nodes).size <= 1) return null;
+         Object.defineProperty(exports, "__esModule", {
+           value: true
+         });
 
-               if (!_extent) {
-                   _extent =  entity.extent(context.graph());
+         function BaselineSplitter(word) {
+           var letters = [];
+           var lastLetter = '';
+           word.split('').forEach(function (letter) {
+             if (isArabic_1.isArabic(letter) && isArabic_1.isArabic(lastLetter)) {
+               if (lastLetter.length && reference.tashkeel.indexOf(letter) > -1) {
+                 letters[letters.length - 1] += letter;
+               } else if (reference.lineBreakers.indexOf(lastLetter) > -1) {
+                 letters.push(letter);
                } else {
-                   _extent = _extent.extend(entity.extent(context.graph()));
-               }
-
-               return actionCircularize(entityID, context.projection);
-           }
-
-           var operation = function() {
-               if (!_actions.length) return;
-
-               var combinedAction = function(graph, t) {
-                   _actions.forEach(function(action) {
-                       if (!action.disabled(graph)) {
-                           graph = action(graph, t);
-                       }
-                   });
-                   return graph;
-               };
-               combinedAction.transitionable = true;
-
-               context.perform(combinedAction, operation.annotation());
-
-               window.setTimeout(function() {
-                   context.validator().validate();
-               }, 300);  // after any transition
-           };
-
-
-           operation.available = function() {
-               return _actions.length && selectedIDs.length === _actions.length;
-           };
-
-
-           // don't cache this because the visible extent could change
-           operation.disabled = function() {
-               if (!_actions.length) return '';
-
-               var actionDisableds = _actions.map(function(action) {
-                   return action.disabled(context.graph());
-               }).filter(Boolean);
-
-               if (actionDisableds.length === _actions.length) {
-                   // none of the features can be circularized
-
-                   if (new Set(actionDisableds).size > 1) {
-                       return 'multiple_blockers';
-                   }
-                   return actionDisableds[0];
-               } else if (_extent.percentContainedIn(context.map().extent()) < 0.8) {
-                   return 'too_large';
-               } else if (someMissing()) {
-                   return 'not_downloaded';
-               } else if (selectedIDs.some(context.hasHiddenConnections)) {
-                   return 'connected_to_hidden';
-               }
-
-               return false;
-
-
-               function someMissing() {
-                   if (context.inIntro()) return false;
-                   var osm = context.connection();
-                   if (osm) {
-                       var missing = _coords.filter(function(loc) { return !osm.isDataLoaded(loc); });
-                       if (missing.length) {
-                           missing.forEach(function(loc) { context.loadTileAtLoc(loc); });
-                           return true;
-                       }
-                   }
-                   return false;
+                 letters[letters.length - 1] += letter;
                }
-           };
-
-
-           operation.tooltip = function() {
-               var disable = operation.disabled();
-               return disable ?
-                   _t('operations.circularize.' + disable + '.' + _amount) :
-                   _t('operations.circularize.description.' + _amount);
-           };
-
-
-           operation.annotation = function() {
-               return _t('operations.circularize.annotation.' + _amount);
-           };
-
-
-           operation.id = 'circularize';
-           operation.keys = [_t('operations.circularize.key')];
-           operation.title = _t('operations.circularize.title');
-           operation.behavior = behaviorOperation(context).which(operation);
-
-           return operation;
-       }
+             } else {
+               letters.push(letter);
+             }
 
-       // Translate a MacOS key command into the appropriate Windows/Linux equivalent.
-       // For example, ⌘Z -> Ctrl+Z
-       var uiCmd = function (code) {
-           var detected = utilDetect();
+             if (reference.tashkeel.indexOf(letter) === -1) {
+               // don't allow tashkeel to hide line break
+               lastLetter = letter;
+             }
+           });
+           return letters;
+         }
 
-           if (detected.os === 'mac') {
-               return code;
-           }
+         exports.BaselineSplitter = BaselineSplitter;
+       });
 
-           if (detected.os === 'win') {
-               if (code === '⌘⇧Z') return 'Ctrl+Y';
-           }
+       var Normalization = createCommonjsModule(function (module, exports) {
 
-           var result = '',
-               replacements = {
-                   '⌘': 'Ctrl',
-                   '⇧': 'Shift',
-                   '⌥': 'Alt',
-                   '⌫': 'Backspace',
-                   '⌦': 'Delete'
-               };
+         Object.defineProperty(exports, "__esModule", {
+           value: true
+         });
 
-           for (var i = 0; i < code.length; i++) {
-               if (code[i] in replacements) {
-                   result += replacements[code[i]] + (i < code.length - 1 ? '+' : '');
-               } else {
-                   result += code[i];
-               }
+         function Normal(word, breakPresentationForm) {
+           // default is to turn initial/isolated/medial/final presentation form to generic
+           if (typeof breakPresentationForm === 'undefined') {
+             breakPresentationForm = true;
            }
 
-           return result;
-       };
-
-
-       // return a display-focused string for a given keyboard code
-       uiCmd.display = function(code) {
-           if (code.length !== 1) return code;
-
-           var detected = utilDetect();
-           var mac = (detected.os === 'mac');
-           var replacements = {
-               '⌘': mac ? '⌘ ' + _t('shortcuts.key.cmd')    : _t('shortcuts.key.ctrl'),
-               '⇧': mac ? '⇧ ' + _t('shortcuts.key.shift')  : _t('shortcuts.key.shift'),
-               '⌥': mac ? '⌥ ' + _t('shortcuts.key.option') : _t('shortcuts.key.alt'),
-               '⌃': mac ? '⌃ ' + _t('shortcuts.key.ctrl')   : _t('shortcuts.key.ctrl'),
-               '⌫': mac ? '⌫ ' + _t('shortcuts.key.delete') : _t('shortcuts.key.backspace'),
-               '⌦': mac ? '⌦ ' + _t('shortcuts.key.del')    : _t('shortcuts.key.del'),
-               '↖': mac ? '↖ ' + _t('shortcuts.key.pgup')   : _t('shortcuts.key.pgup'),
-               '↘': mac ? '↘ ' + _t('shortcuts.key.pgdn')   : _t('shortcuts.key.pgdn'),
-               '⇞': mac ? '⇞ ' + _t('shortcuts.key.home')   : _t('shortcuts.key.home'),
-               '⇟': mac ? '⇟ ' + _t('shortcuts.key.end')    : _t('shortcuts.key.end'),
-               '↵': mac ? '⏎ ' + _t('shortcuts.key.return') : _t('shortcuts.key.enter'),
-               '⎋': mac ? '⎋ ' + _t('shortcuts.key.esc')    : _t('shortcuts.key.esc'),
-               '☰': mac ? '☰ ' + _t('shortcuts.key.menu')  : _t('shortcuts.key.menu'),
-           };
-
-           return replacements[code] || code;
-       };
-
-       function operationDelete(context, selectedIDs) {
-           var multi = (selectedIDs.length === 1 ? 'single' : 'multiple');
-           var action = actionDeleteMultiple(selectedIDs);
-           var nodes = utilGetAllNodes(selectedIDs, context.graph());
-           var coords = nodes.map(function(n) { return n.loc; });
-           var extent = utilTotalExtent(selectedIDs, context.graph());
-
-
-           var operation = function() {
-               var nextSelectedID;
-               var nextSelectedLoc;
-
-               if (selectedIDs.length === 1) {
-                   var id = selectedIDs[0];
-                   var entity = context.entity(id);
-                   var geometry = entity.geometry(context.graph());
-                   var parents = context.graph().parentWays(entity);
-                   var parent = parents[0];
-
-                   // Select the next closest node in the way.
-                   if (geometry === 'vertex') {
-                       var nodes = parent.nodes;
-                       var i = nodes.indexOf(id);
-
-                       if (i === 0) {
-                           i++;
-                       } else if (i === nodes.length - 1) {
-                           i--;
-                       } else {
-                           var a = geoSphericalDistance(entity.loc, context.entity(nodes[i - 1]).loc);
-                           var b = geoSphericalDistance(entity.loc, context.entity(nodes[i + 1]).loc);
-                           i = a < b ? i - 1 : i + 1;
-                       }
-
-                       nextSelectedID = nodes[i];
-                       nextSelectedLoc = context.entity(nextSelectedID).loc;
-                   }
-               }
-
-               context.perform(action, operation.annotation());
-               context.validator().validate();
-
-               if (nextSelectedID && nextSelectedLoc) {
-                   if (context.hasEntity(nextSelectedID)) {
-                       context.enter(modeSelect(context, [nextSelectedID]).follow(true));
-                   } else {
-                       context.map().centerEase(nextSelectedLoc);
-                       context.enter(modeBrowse(context));
-                   }
-               } else {
-                   context.enter(modeBrowse(context));
-               }
-
-           };
-
-
-           operation.available = function() {
-               return true;
-           };
-
-
-           operation.disabled = function() {
-               if (extent.percentContainedIn(context.map().extent()) < 0.8) {
-                   return 'too_large';
-               } else if (someMissing()) {
-                   return 'not_downloaded';
-               } else if (selectedIDs.some(context.hasHiddenConnections)) {
-                   return 'connected_to_hidden';
-               } else if (selectedIDs.some(protectedMember)) {
-                   return 'part_of_relation';
-               } else if (selectedIDs.some(incompleteRelation)) {
-                   return 'incomplete_relation';
-               } else if (selectedIDs.some(hasWikidataTag)) {
-                   return 'has_wikidata_tag';
-               }
-
-               return false;
-
-
-               function someMissing() {
-                   if (context.inIntro()) return false;
-                   var osm = context.connection();
-                   if (osm) {
-                       var missing = coords.filter(function(loc) { return !osm.isDataLoaded(loc); });
-                       if (missing.length) {
-                           missing.forEach(function(loc) { context.loadTileAtLoc(loc); });
-                           return true;
-                       }
-                   }
-                   return false;
-               }
-
-               function hasWikidataTag(id) {
-                   var entity = context.entity(id);
-                   return entity.tags.wikidata && entity.tags.wikidata.trim().length > 0;
-               }
-
-               function incompleteRelation(id) {
-                   var entity = context.entity(id);
-                   return entity.type === 'relation' && !entity.isComplete(context.graph());
-               }
-
-               function protectedMember(id) {
-                   var entity = context.entity(id);
-                   if (entity.type !== 'way') return false;
-
-                   var parents = context.graph().parentRelations(entity);
-                   for (var i = 0; i < parents.length; i++) {
-                       var parent = parents[i];
-                       var type = parent.tags.type;
-                       var role = parent.memberById(id).role || 'outer';
-                       if (type === 'route' || type === 'boundary' || (type === 'multipolygon' && role === 'outer')) {
-                           return true;
-                       }
-                   }
-                   return false;
-               }
-           };
-
-
-           operation.tooltip = function() {
-               var disable = operation.disabled();
-               return disable ?
-                   _t('operations.delete.' + disable + '.' + multi) :
-                   _t('operations.delete.description' + '.' + multi);
-           };
-
+           var returnable = '';
+           word.split('').forEach(function (letter) {
+             if (!isArabic_1.isArabic(letter)) {
+               returnable += letter;
+               return;
+             }
 
-           operation.annotation = function() {
-               return selectedIDs.length === 1 ?
-                   _t('operations.delete.annotation.' + context.graph().geometry(selectedIDs[0])) :
-                   _t('operations.delete.annotation.multiple', { n: selectedIDs.length });
-           };
+             for (var w = 0; w < reference.letterList.length; w++) {
+               // ok so we are checking this potential lettertron
+               var letterForms = unicodeArabic["default"][reference.letterList[w]];
+               var versions = Object.keys(letterForms);
 
+               for (var v = 0; v < versions.length; v++) {
+                 var localVersion = letterForms[versions[v]];
 
-           operation.id = 'delete';
-           operation.keys = [uiCmd('⌘⌫'), uiCmd('⌘⌦'), uiCmd('⌦')];
-           operation.title = _t('operations.delete.title');
-           operation.behavior = behaviorOperation(context).which(operation);
+                 if (_typeof(localVersion) === 'object' && typeof localVersion.indexOf === 'undefined') {
+                   // look at this embedded object
+                   var embeddedForms = Object.keys(localVersion);
 
-           return operation;
-       }
+                   for (var ef = 0; ef < embeddedForms.length; ef++) {
+                     var form = localVersion[embeddedForms[ef]];
 
-       function operationOrthogonalize(context, selectedIDs) {
-           var _extent;
-           var _type;
-           var _actions = selectedIDs.map(chooseAction).filter(Boolean);
-           var _amount = _actions.length === 1 ? 'single' : 'multiple';
-           var _coords = utilGetAllNodes(selectedIDs, context.graph())
-               .map(function(n) { return n.loc; });
+                     if (form === letter || _typeof(form) === 'object' && form.indexOf && form.indexOf(letter) > -1) {
+                       // match
+                       // console.log('embedded match');
+                       if (form === letter) {
+                         // match exact
+                         if (breakPresentationForm && localVersion['normal'] && ['isolated', 'initial', 'medial', 'final'].indexOf(embeddedForms[ef]) > -1) {
+                           // replace presentation form
+                           // console.log('keeping normal form of the letter');
+                           if (_typeof(localVersion['normal']) === 'object') {
+                             returnable += localVersion['normal'][0];
+                           } else {
+                             returnable += localVersion['normal'];
+                           }
 
+                           return;
+                         } // console.log('keeping this letter');
 
-           function chooseAction(entityID) {
 
-               var entity = context.entity(entityID);
-               var geometry = entity.geometry(context.graph());
+                         returnable += letter;
+                         return;
+                       } else if (_typeof(form) === 'object' && form.indexOf && form.indexOf(letter) > -1) {
+                         // match
+                         returnable += form[0]; // console.log('added the first letter from the same array');
 
-               if (!_extent) {
-                   _extent =  entity.extent(context.graph());
-               } else {
-                   _extent = _extent.extend(entity.extent(context.graph()));
-               }
-
-               // square a line/area
-               if (entity.type === 'way' && new Set(entity.nodes).size > 2 ) {
-                   if (_type && _type !== 'feature') return null;
-                   _type = 'feature';
-                   return actionOrthogonalize(entityID, context.projection);
-
-               // square a single vertex
-               } else if (geometry === 'vertex') {
-                   if (_type && _type !== 'corner') return null;
-                   _type = 'corner';
-                   var graph = context.graph();
-                   var parents = graph.parentWays(entity);
-                   if (parents.length === 1) {
-                       var way = parents[0];
-                       if (way.nodes.indexOf(entityID) !== -1) {
-                           return actionOrthogonalize(way.id, context.projection, entityID);
+                         return;
                        }
+                     }
                    }
-               }
-
-               return null;
-           }
-
-
-           var operation = function() {
-               if (!_actions.length) return;
-
-               var combinedAction = function(graph, t) {
-                   _actions.forEach(function(action) {
-                       if (!action.disabled(graph)) {
-                           graph = action(graph, t);
-                       }
-                   });
-                   return graph;
-               };
-               combinedAction.transitionable = true;
-
-               context.perform(combinedAction, operation.annotation());
-
-               window.setTimeout(function() {
-                   context.validator().validate();
-               }, 300);  // after any transition
-           };
-
-
-           operation.available = function() {
-               return _actions.length && selectedIDs.length === _actions.length;
-           };
-
-
-           // don't cache this because the visible extent could change
-           operation.disabled = function() {
-               if (!_actions.length) return '';
-
-               var actionDisableds = _actions.map(function(action) {
-                   return action.disabled(context.graph());
-               }).filter(Boolean);
-
-               if (actionDisableds.length === _actions.length) {
-                   // none of the features can be squared
+                 } else if (localVersion === letter) {
+                   // match exact
+                   if (breakPresentationForm && letterForms['normal'] && ['isolated', 'initial', 'medial', 'final'].indexOf(versions[v]) > -1) {
+                     // replace presentation form
+                     // console.log('keeping normal form of the letter');
+                     if (_typeof(letterForms['normal']) === 'object') {
+                       returnable += letterForms['normal'][0];
+                     } else {
+                       returnable += letterForms['normal'];
+                     }
 
-                   if (new Set(actionDisableds).size > 1) {
-                       return 'multiple_blockers';
-                   }
-                   return actionDisableds[0];
-               } else if (_extent &&
-                          _extent.percentContainedIn(context.map().extent()) < 0.8) {
-                   return 'too_large';
-               } else if (someMissing()) {
-                   return 'not_downloaded';
-               } else if (selectedIDs.some(context.hasHiddenConnections)) {
-                   return 'connected_to_hidden';
-               }
+                     return;
+                   } // console.log('keeping this letter');
 
-               return false;
 
+                   returnable += letter;
+                   return;
+                 } else if (_typeof(localVersion) === 'object' && localVersion.indexOf && localVersion.indexOf(letter) > -1) {
+                   // match
+                   returnable += localVersion[0]; // console.log('added the first letter from the same array');
 
-               function someMissing() {
-                   if (context.inIntro()) return false;
-                   var osm = context.connection();
-                   if (osm) {
-                       var missing = _coords.filter(function(loc) { return !osm.isDataLoaded(loc); });
-                       if (missing.length) {
-                           missing.forEach(function(loc) { context.loadTileAtLoc(loc); });
-                           return true;
-                       }
-                   }
-                   return false;
+                   return;
+                 }
                }
-           };
-
-
-           operation.tooltip = function() {
-               var disable = operation.disabled();
-               return disable ?
-                   _t('operations.orthogonalize.' + disable + '.' + _amount) :
-                   _t('operations.orthogonalize.description.' + _type + '.' + _amount);
-           };
-
-
-           operation.annotation = function() {
-               return _t('operations.orthogonalize.annotation.' + _type + '.' + _amount);
-           };
-
-
-           operation.id = 'orthogonalize';
-           operation.keys = [_t('operations.orthogonalize.key')];
-           operation.title = _t('operations.orthogonalize.title');
-           operation.behavior = behaviorOperation(context).which(operation);
-
-           return operation;
-       }
-
-       function operationReflectShort(context, selectedIDs) {
-           return operationReflect(context, selectedIDs, 'short');
-       }
-
-
-       function operationReflectLong(context, selectedIDs) {
-           return operationReflect(context, selectedIDs, 'long');
-       }
-
-
-       function operationReflect(context, selectedIDs, axis) {
-           axis = axis || 'long';
-           var multi = (selectedIDs.length === 1 ? 'single' : 'multiple');
-           var nodes = utilGetAllNodes(selectedIDs, context.graph());
-           var coords = nodes.map(function(n) { return n.loc; });
-           var extent = utilTotalExtent(selectedIDs, context.graph());
-
-
-           var operation = function() {
-               var action = actionReflect(selectedIDs, context.projection)
-                   .useLongAxis(Boolean(axis === 'long'));
-
-               context.perform(action, operation.annotation());
-
-               window.setTimeout(function() {
-                   context.validator().validate();
-               }, 300);  // after any transition
-           };
+             } // try ligatures
 
 
-           operation.available = function() {
-               return nodes.length >= 3;
-           };
-
-
-           // don't cache this because the visible extent could change
-           operation.disabled = function() {
-               if (extent.percentContainedIn(context.map().extent()) < 0.8) {
-                   return 'too_large';
-               } else if (someMissing()) {
-                   return 'not_downloaded';
-               } else if (selectedIDs.some(context.hasHiddenConnections)) {
-                   return 'connected_to_hidden';
-               } else if (selectedIDs.some(incompleteRelation)) {
-                   return 'incomplete_relation';
-               }
-
-               return false;
+             for (var v2 = 0; v2 < reference.ligatureList.length; v2++) {
+               var normalForm = reference.ligatureList[v2];
 
+               if (normalForm !== 'words') {
+                 var ligForms = Object.keys(unicodeLigatures["default"][normalForm]);
 
-               function someMissing() {
-                   if (context.inIntro()) return false;
-                   var osm = context.connection();
-                   if (osm) {
-                       var missing = coords.filter(function(loc) { return !osm.isDataLoaded(loc); });
-                       if (missing.length) {
-                           missing.forEach(function(loc) { context.loadTileAtLoc(loc); });
-                           return true;
-                       }
+                 for (var f = 0; f < ligForms.length; f++) {
+                   if (unicodeLigatures["default"][normalForm][ligForms[f]] === letter) {
+                     returnable += normalForm;
+                     return;
                    }
-                   return false;
+                 }
                }
+             } // try words ligatures
 
-               function incompleteRelation(id) {
-                   var entity = context.entity(id);
-                   return entity.type === 'relation' && !entity.isComplete(context.graph());
-               }
-           };
 
+             for (var v3 = 0; v3 < reference.ligatureWordList.length; v3++) {
+               var _normalForm = reference.ligatureWordList[v3];
 
-           operation.tooltip = function() {
-               var disable = operation.disabled();
-               return disable ?
-                   _t('operations.reflect.' + disable + '.' + multi) :
-                   _t('operations.reflect.description.' + axis + '.' + multi);
-           };
+               if (unicodeLigatures["default"].words[_normalForm] === letter) {
+                 returnable += _normalForm;
+                 return;
+               }
+             }
 
+             returnable += letter; // console.log('kept the letter')
+           });
+           return returnable;
+         }
 
-           operation.annotation = function() {
-               return _t('operations.reflect.annotation.' + axis + '.' + multi);
-           };
+         exports.Normal = Normal;
+       });
 
+       var CharShaper_1 = createCommonjsModule(function (module, exports) {
 
-           operation.id = 'reflect-' + axis;
-           operation.keys = [_t('operations.reflect.key.' + axis)];
-           operation.title = _t('operations.reflect.title.' + axis);
-           operation.behavior = behaviorOperation(context).which(operation);
+         Object.defineProperty(exports, "__esModule", {
+           value: true
+         });
 
-           return operation;
-       }
+         function CharShaper(letter, form) {
+           if (!isArabic_1.isArabic(letter)) {
+             // fail not Arabic
+             throw new Error('Not Arabic');
+           }
 
-       function operationMove(context, selectedIDs) {
-           var multi = (selectedIDs.length === 1 ? 'single' : 'multiple');
-           var nodes = utilGetAllNodes(selectedIDs, context.graph());
-           var coords = nodes.map(function(n) { return n.loc; });
-           var extent = utilTotalExtent(selectedIDs, context.graph());
+           if (letter === "\u0621") {
+             // hamza alone
+             return "\u0621";
+           }
 
+           for (var w = 0; w < reference.letterList.length; w++) {
+             // ok so we are checking this potential lettertron
+             var letterForms = unicodeArabic["default"][reference.letterList[w]];
+             var versions = Object.keys(letterForms);
 
-           var operation = function() {
-               context.enter(modeMove(context, selectedIDs));
-           };
+             for (var v = 0; v < versions.length; v++) {
+               var localVersion = letterForms[versions[v]];
 
+               if (localVersion === letter || _typeof(localVersion) === 'object' && localVersion.indexOf && localVersion.indexOf(letter) > -1) {
+                 if (versions.indexOf(form) > -1) {
+                   return letterForms[form];
+                 }
+               } else if (_typeof(localVersion) === 'object' && typeof localVersion.indexOf === 'undefined') {
+                 // check embedded
+                 var embeddedVersions = Object.keys(localVersion);
+
+                 for (var ev = 0; ev < embeddedVersions.length; ev++) {
+                   if (localVersion[embeddedVersions[ev]] === letter || _typeof(localVersion[embeddedVersions[ev]]) === 'object' && localVersion[embeddedVersions[ev]].indexOf && localVersion[embeddedVersions[ev]].indexOf(letter) > -1) {
+                     if (embeddedVersions.indexOf(form) > -1) {
+                       return localVersion[form];
+                     }
+                   }
+                 }
+               }
+             }
+           }
+         }
 
-           operation.available = function() {
-               return selectedIDs.length > 1 ||
-                   context.entity(selectedIDs[0]).type !== 'node';
-           };
+         exports.CharShaper = CharShaper;
+       });
 
+       var WordShaper_1 = createCommonjsModule(function (module, exports) {
 
-           operation.disabled = function() {
-               if (extent.percentContainedIn(context.map().extent()) < 0.8) {
-                   return 'too_large';
-               } else if (someMissing()) {
-                   return 'not_downloaded';
-               } else if (selectedIDs.some(context.hasHiddenConnections)) {
-                   return 'connected_to_hidden';
-               } else if (selectedIDs.some(incompleteRelation)) {
-                   return 'incomplete_relation';
-               }
+         Object.defineProperty(exports, "__esModule", {
+           value: true
+         });
 
-               return false;
+         function WordShaper(word) {
+           var state = 'initial';
+           var output = '';
 
+           for (var w = 0; w < word.length; w++) {
+             var nextLetter = ' ';
 
-               function someMissing() {
-                   if (context.inIntro()) return false;
-                   var osm = context.connection();
-                   if (osm) {
-                       var missing = coords.filter(function(loc) { return !osm.isDataLoaded(loc); });
-                       if (missing.length) {
-                           missing.forEach(function(loc) { context.loadTileAtLoc(loc); });
-                           return true;
-                       }
-                   }
-                   return false;
+             for (var nxw = w + 1; nxw < word.length; nxw++) {
+               if (!isArabic_1.isArabic(word[nxw])) {
+                 break;
                }
 
-               function incompleteRelation(id) {
-                   var entity = context.entity(id);
-                   return entity.type === 'relation' && !entity.isComplete(context.graph());
+               if (reference.tashkeel.indexOf(word[nxw]) === -1) {
+                 nextLetter = word[nxw];
+                 break;
                }
-           };
+             }
 
+             if (!isArabic_1.isArabic(word[w]) || isArabic_1.isMath(word[w])) {
+               // space or other non-Arabic
+               output += word[w];
+               state = 'initial';
+             } else if (reference.tashkeel.indexOf(word[w]) > -1) {
+               // tashkeel - add without changing state
+               output += word[w];
+             } else if (nextLetter === ' ' || // last Arabic letter in this word
+             reference.lineBreakers.indexOf(word[w]) > -1) {
+               // the current letter is known to break lines
+               output += CharShaper_1.CharShaper(word[w], state === 'initial' ? 'isolated' : 'final');
+               state = 'initial';
+             } else if (reference.lams.indexOf(word[w]) > -1 && reference.alefs.indexOf(nextLetter) > -1) {
+               // LA letters - advance an additional letter after this
+               output += unicodeLigatures["default"][word[w] + nextLetter][state === 'initial' ? 'isolated' : 'final'];
 
-           operation.tooltip = function() {
-               var disable = operation.disabled();
-               return disable ?
-                   _t('operations.move.' + disable + '.' + multi) :
-                   _t('operations.move.description.' + multi);
-           };
+               while (word[w] !== nextLetter) {
+                 w++;
+               }
 
+               state = 'initial';
+             } else {
+               output += CharShaper_1.CharShaper(word[w], state);
+               state = 'medial';
+             }
+           }
 
-           operation.annotation = function() {
-               return selectedIDs.length === 1 ?
-                   _t('operations.move.annotation.' + context.graph().geometry(selectedIDs[0])) :
-                   _t('operations.move.annotation.multiple');
-           };
+           return output;
+         }
 
+         exports.WordShaper = WordShaper;
+       });
 
-           operation.id = 'move';
-           operation.keys = [_t('operations.move.key')];
-           operation.title = _t('operations.move.title');
-           operation.behavior = behaviorOperation(context).which(operation);
+       var ParentLetter_1 = createCommonjsModule(function (module, exports) {
 
-           operation.mouseOnly = true;
+         Object.defineProperty(exports, "__esModule", {
+           value: true
+         });
 
-           return operation;
-       }
+         function ParentLetter(letter) {
+           if (!isArabic_1.isArabic(letter)) {
+             throw new Error('Not an Arabic letter');
+           }
 
-       function modeRotate(context, entityIDs) {
-           var mode = {
-               id: 'rotate',
-               button: 'browse'
-           };
+           for (var w = 0; w < reference.letterList.length; w++) {
+             // ok so we are checking this potential lettertron
+             var letterForms = unicodeArabic["default"][reference.letterList[w]];
+             var versions = Object.keys(letterForms);
 
-           var keybinding = utilKeybinding('rotate');
-           var behaviors = [
-               behaviorEdit(context),
-               operationCircularize(context, entityIDs).behavior,
-               operationDelete(context, entityIDs).behavior,
-               operationMove(context, entityIDs).behavior,
-               operationOrthogonalize(context, entityIDs).behavior,
-               operationReflectLong(context, entityIDs).behavior,
-               operationReflectShort(context, entityIDs).behavior
-           ];
-           var annotation = entityIDs.length === 1 ?
-               _t('operations.rotate.annotation.' + context.graph().geometry(entityIDs[0])) :
-               _t('operations.rotate.annotation.multiple');
-
-           var _prevGraph;
-           var _prevAngle;
-           var _prevTransform;
-           var _pivot;
+             for (var v = 0; v < versions.length; v++) {
+               var localVersion = letterForms[versions[v]];
 
+               if (_typeof(localVersion) === 'object' && typeof localVersion.indexOf === 'undefined') {
+                 // look at this embedded object
+                 var embeddedForms = Object.keys(localVersion);
 
-           function doRotate() {
-               var fn;
-               if (context.graph() !== _prevGraph) {
-                   fn = context.perform;
-               } else {
-                   fn = context.replace;
+                 for (var ef = 0; ef < embeddedForms.length; ef++) {
+                   var form = localVersion[embeddedForms[ef]];
+
+                   if (form === letter || _typeof(form) === 'object' && form.indexOf && form.indexOf(letter) > -1) {
+                     // match
+                     return localVersion;
+                   }
+                 }
+               } else if (localVersion === letter || _typeof(localVersion) === 'object' && localVersion.indexOf && localVersion.indexOf(letter) > -1) {
+                 // match
+                 return letterForms;
                }
+             }
 
-               // projection changed, recalculate _pivot
-               var projection = context.projection;
-               var currTransform = projection.transform();
-               if (!_prevTransform ||
-                   currTransform.k !== _prevTransform.k ||
-                   currTransform.x !== _prevTransform.x ||
-                   currTransform.y !== _prevTransform.y) {
+             return null;
+           }
+         }
 
-                   var nodes = utilGetAllNodes(entityIDs, context.graph());
-                   var points = nodes.map(function(n) { return projection(n.loc); });
-                   _pivot = getPivot(points);
-                   _prevAngle = undefined;
-               }
+         exports.ParentLetter = ParentLetter;
 
+         function GrandparentLetter(letter) {
+           if (!isArabic_1.isArabic(letter)) {
+             throw new Error('Not an Arabic letter');
+           }
 
-               var currMouse = context.map().mouse();
-               var currAngle = Math.atan2(currMouse[1] - _pivot[1], currMouse[0] - _pivot[0]);
+           for (var w = 0; w < reference.letterList.length; w++) {
+             // ok so we are checking this potential lettertron
+             var letterForms = unicodeArabic["default"][reference.letterList[w]];
+             var versions = Object.keys(letterForms);
 
-               if (typeof _prevAngle === 'undefined') _prevAngle = currAngle;
-               var delta = currAngle - _prevAngle;
+             for (var v = 0; v < versions.length; v++) {
+               var localVersion = letterForms[versions[v]];
 
-               fn(actionRotate(entityIDs, _pivot, delta, projection));
+               if (_typeof(localVersion) === 'object' && typeof localVersion.indexOf === 'undefined') {
+                 // look at this embedded object
+                 var embeddedForms = Object.keys(localVersion);
 
-               _prevTransform = currTransform;
-               _prevAngle = currAngle;
-               _prevGraph = context.graph();
-           }
+                 for (var ef = 0; ef < embeddedForms.length; ef++) {
+                   var form = localVersion[embeddedForms[ef]];
 
-           function getPivot(points) {
-               var _pivot;
-               if (points.length === 1) {
-                   _pivot = points[0];
-               } else if (points.length === 2) {
-                   _pivot = geoVecInterp(points[0], points[1], 0.5);
-               } else {
-                   var polygonHull = d3_polygonHull(points);
-                   if (polygonHull.length === 2) {
-                       _pivot = geoVecInterp(points[0], points[1], 0.5);
-                   } else {
-                       _pivot = d3_polygonCentroid(d3_polygonHull(points));
+                   if (form === letter || _typeof(form) === 'object' && form.indexOf && form.indexOf(letter) > -1) {
+                     // match
+                     return letterForms;
                    }
+                 }
+               } else if (localVersion === letter || _typeof(localVersion) === 'object' && localVersion.indexOf && localVersion.indexOf(letter) > -1) {
+                 // match
+                 return letterForms;
                }
-               return _pivot;
+             }
+
+             return null;
            }
+         }
 
+         exports.GrandparentLetter = GrandparentLetter;
+       });
 
-           function finish() {
-               event.stopPropagation();
-               context.replace(actionNoop(), annotation);
-               context.enter(modeSelect(context, entityIDs));
-           }
+       var lib = createCommonjsModule(function (module, exports) {
 
+         Object.defineProperty(exports, "__esModule", {
+           value: true
+         });
+         exports.isArabic = isArabic_1.isArabic;
+         exports.GlyphSplitter = GlyphSplitter_1.GlyphSplitter;
+         exports.BaselineSplitter = BaselineSplitter_1.BaselineSplitter;
+         exports.Normal = Normalization.Normal;
+         exports.CharShaper = CharShaper_1.CharShaper;
+         exports.WordShaper = WordShaper_1.WordShaper;
+         exports.ParentLetter = ParentLetter_1.ParentLetter;
+         exports.GrandparentLetter = ParentLetter_1.GrandparentLetter;
+       });
 
-           function cancel() {
-               context.pop();
-               context.enter(modeSelect(context, entityIDs));
-           }
+       var rtlRegex = /[\u0590-\u05FF\u0600-\u06FF\u0750-\u07BF\u08A0–\u08BF]/;
+       function fixRTLTextForSvg(inputText) {
+         var ret = '',
+             rtlBuffer = [];
+         var arabicRegex = /[\u0600-\u06FF]/g;
+         var arabicDiacritics = /[\u0610-\u061A\u064B-\u065F\u0670\u06D6-\u06ED]/g;
+         var arabicMath = /[\u0660-\u066C\u06F0-\u06F9]+/g;
+         var thaanaVowel = /[\u07A6-\u07B0]/;
+         var hebrewSign = /[\u0591-\u05bd\u05bf\u05c1-\u05c5\u05c7]/; // Arabic word shaping
 
+         if (arabicRegex.test(inputText)) {
+           inputText = lib.WordShaper(inputText);
+         }
 
-           function undone() {
-               context.enter(modeBrowse(context));
+         for (var n = 0; n < inputText.length; n++) {
+           var c = inputText[n];
+
+           if (arabicMath.test(c)) {
+             // Arabic numbers go LTR
+             ret += rtlBuffer.reverse().join('');
+             rtlBuffer = [c];
+           } else {
+             if (rtlBuffer.length && arabicMath.test(rtlBuffer[rtlBuffer.length - 1])) {
+               ret += rtlBuffer.reverse().join('');
+               rtlBuffer = [];
+             }
+
+             if ((thaanaVowel.test(c) || hebrewSign.test(c) || arabicDiacritics.test(c)) && rtlBuffer.length) {
+               rtlBuffer[rtlBuffer.length - 1] += c;
+             } else if (rtlRegex.test(c) // include Arabic presentation forms
+             || c.charCodeAt(0) >= 64336 && c.charCodeAt(0) <= 65023 || c.charCodeAt(0) >= 65136 && c.charCodeAt(0) <= 65279) {
+               rtlBuffer.push(c);
+             } else if (c === ' ' && rtlBuffer.length) {
+               // whitespace within RTL text
+               rtlBuffer = [rtlBuffer.reverse().join('') + ' '];
+             } else {
+               // non-RTL character
+               ret += rtlBuffer.reverse().join('') + c;
+               rtlBuffer = [];
+             }
            }
+         }
 
+         ret += rtlBuffer.reverse().join('');
+         return ret;
+       }
 
-           mode.enter = function() {
-               context.features().forceVisible(entityIDs);
+       var propertyIsEnumerable = objectPropertyIsEnumerable.f;
 
-               behaviors.forEach(context.install);
+       // `Object.{ entries, values }` methods implementation
+       var createMethod$5 = function (TO_ENTRIES) {
+         return function (it) {
+           var O = toIndexedObject(it);
+           var keys = objectKeys(O);
+           var length = keys.length;
+           var i = 0;
+           var result = [];
+           var key;
+           while (length > i) {
+             key = keys[i++];
+             if (!descriptors || propertyIsEnumerable.call(O, key)) {
+               result.push(TO_ENTRIES ? [key, O[key]] : O[key]);
+             }
+           }
+           return result;
+         };
+       };
 
-               context.surface()
-                   .on('mousemove.rotate', doRotate)
-                   .on('click.rotate', finish);
+       var objectToArray = {
+         // `Object.entries` method
+         // https://tc39.github.io/ecma262/#sec-object.entries
+         entries: createMethod$5(true),
+         // `Object.values` method
+         // https://tc39.github.io/ecma262/#sec-object.values
+         values: createMethod$5(false)
+       };
 
-               context.history()
-                   .on('undone.rotate', undone);
+       var $values = objectToArray.values;
 
-               keybinding
-                   .on('⎋', cancel)
-                   .on('↩', finish);
+       // `Object.values` method
+       // https://tc39.github.io/ecma262/#sec-object.values
+       _export({ target: 'Object', stat: true }, {
+         values: function values(O) {
+           return $values(O);
+         }
+       });
 
-               select(document)
-                   .call(keybinding);
-           };
+       // https://github.com/openstreetmap/iD/issues/772
+       // http://mathiasbynens.be/notes/localstorage-pattern#comment-9
+       var _storage;
 
+       try {
+         _storage = localStorage;
+       } catch (e) {} // eslint-disable-line no-empty
 
-           mode.exit = function() {
-               behaviors.forEach(context.uninstall);
 
-               context.surface()
-                   .on('mousemove.rotate', null)
-                   .on('click.rotate', null);
+       _storage = _storage || function () {
+         var s = {};
+         return {
+           getItem: function getItem(k) {
+             return s[k];
+           },
+           setItem: function setItem(k, v) {
+             return s[k] = v;
+           },
+           removeItem: function removeItem(k) {
+             return delete s[k];
+           }
+         };
+       }(); //
+       // corePreferences is an interface for persisting basic key-value strings
+       // within and between iD sessions on the same site.
+       //
 
-               context.history()
-                   .on('undone.rotate', null);
 
-               select(document)
-                   .call(keybinding.unbind);
+       function corePreferences(k, v) {
+         try {
+           if (arguments.length === 1) return _storage.getItem(k);else if (v === null) _storage.removeItem(k);else _storage.setItem(k, v);
+         } catch (e) {
+           /* eslint-disable no-console */
+           if (typeof console !== 'undefined') {
+             console.error('localStorage quota exceeded');
+           }
+           /* eslint-enable no-console */
 
-               context.features().forceVisible([]);
-           };
+         }
+       }
 
+       function responseText(response) {
+         if (!response.ok) throw new Error(response.status + " " + response.statusText);
+         return response.text();
+       }
 
-           mode.selectedIDs = function() {
-               if (!arguments.length) return entityIDs;
-               // no assign
-               return mode;
-           };
+       function d3_text (input, init) {
+         return fetch(input, init).then(responseText);
+       }
 
+       function responseJson(response) {
+         if (!response.ok) throw new Error(response.status + " " + response.statusText);
+         if (response.status === 204 || response.status === 205) return;
+         return response.json();
+       }
 
-           return mode;
+       function d3_json (input, init) {
+         return fetch(input, init).then(responseJson);
        }
 
-       function operationRotate(context, selectedIDs) {
-           var multi = (selectedIDs.length === 1 ? 'single' : 'multiple');
-           var nodes = utilGetAllNodes(selectedIDs, context.graph());
-           var coords = nodes.map(function(n) { return n.loc; });
-           var extent = utilTotalExtent(selectedIDs, context.graph());
+       function parser(type) {
+         return function (input, init) {
+           return d3_text(input, init).then(function (text) {
+             return new DOMParser().parseFromString(text, type);
+           });
+         };
+       }
 
+       var d3_xml = parser("application/xml");
+       var svg = parser("image/svg+xml");
 
-           var operation = function() {
-               context.enter(modeRotate(context, selectedIDs));
-           };
+       var _mainFileFetcher = coreFileFetcher(); // singleton
+       // coreFileFetcher asynchronously fetches data from JSON files
+       //
 
+       function coreFileFetcher() {
+         var _this = {};
+         var _inflight = {};
+         var _fileMap = {
+           'address_formats': 'data/address_formats.min.json',
+           'deprecated': 'data/deprecated.min.json',
+           'discarded': 'data/discarded.min.json',
+           'imagery': 'data/imagery.min.json',
+           'intro_graph': 'data/intro_graph.min.json',
+           'keepRight': 'data/keepRight.min.json',
+           'languages': 'data/languages.min.json',
+           'locales': 'data/locales.min.json',
+           'nsi_brands': 'https://cdn.jsdelivr.net/npm/name-suggestion-index@4/dist/brands.min.json',
+           'nsi_filters': 'https://cdn.jsdelivr.net/npm/name-suggestion-index@4/dist/filters.min.json',
+           'oci_features': 'https://cdn.jsdelivr.net/npm/osm-community-index@2/dist/features.min.json',
+           'oci_resources': 'https://cdn.jsdelivr.net/npm/osm-community-index@2/dist/resources.min.json',
+           'preset_categories': 'data/preset_categories.min.json',
+           'preset_defaults': 'data/preset_defaults.min.json',
+           'preset_fields': 'data/preset_fields.min.json',
+           'preset_presets': 'data/preset_presets.min.json',
+           'phone_formats': 'data/phone_formats.min.json',
+           'qa_data': 'data/qa_data.min.json',
+           'shortcuts': 'data/shortcuts.min.json',
+           'territory_languages': 'data/territory_languages.min.json',
+           'wmf_sitematrix': 'https://cdn.jsdelivr.net/npm/wmf-sitematrix@0.1/wikipedia.min.json'
+         };
+         var _cachedData = {}; // expose the cache; useful for tests
 
-           operation.available = function() {
-               return nodes.length >= 2;
-           };
+         _this.cache = function () {
+           return _cachedData;
+         }; // Returns a Promise to fetch data
+         // (resolved with the data if we have it already)
 
 
-           operation.disabled = function() {
+         _this.get = function (which) {
+           if (_cachedData[which]) {
+             return Promise.resolve(_cachedData[which]);
+           }
 
-               if (extent.percentContainedIn(context.map().extent()) < 0.8) {
-                   return 'too_large';
-               } else if (someMissing()) {
-                   return 'not_downloaded';
-               } else if (selectedIDs.some(context.hasHiddenConnections)) {
-                   return 'connected_to_hidden';
-               } else if (selectedIDs.some(incompleteRelation)) {
-                   return 'incomplete_relation';
-               }
+           var file = _fileMap[which];
 
-               return false;
+           var url = file && _this.asset(file);
 
+           if (!url) {
+             return Promise.reject("Unknown data file for \"".concat(which, "\""));
+           }
 
-               function someMissing() {
-                   if (context.inIntro()) return false;
-                   var osm = context.connection();
-                   if (osm) {
-                       var missing = coords.filter(function(loc) { return !osm.isDataLoaded(loc); });
-                       if (missing.length) {
-                           missing.forEach(function(loc) { context.loadTileAtLoc(loc); });
-                           return true;
-                       }
-                   }
-                   return false;
-               }
+           var prom = _inflight[url];
 
-               function incompleteRelation(id) {
-                   var entity = context.entity(id);
-                   return entity.type === 'relation' && !entity.isComplete(context.graph());
+           if (!prom) {
+             _inflight[url] = prom = d3_json(url).then(function (result) {
+               delete _inflight[url];
+
+               if (!result) {
+                 throw new Error("No data loaded for \"".concat(which, "\""));
                }
-           };
 
+               _cachedData[which] = result;
+               return result;
+             })["catch"](function (err) {
+               delete _inflight[url];
+               throw err;
+             });
+           }
 
-           operation.tooltip = function() {
-               var disable = operation.disabled();
-               return disable ?
-                   _t('operations.rotate.' + disable + '.' + multi) :
-                   _t('operations.rotate.description.' + multi);
-           };
+           return prom;
+         }; // Accessor for the file map
 
 
-           operation.annotation = function() {
-               return selectedIDs.length === 1 ?
-                   _t('operations.rotate.annotation.' + context.graph().geometry(selectedIDs[0])) :
-                   _t('operations.rotate.annotation.multiple');
-           };
+         _this.fileMap = function (val) {
+           if (!arguments.length) return _fileMap;
+           _fileMap = val;
+           return _this;
+         };
 
+         var _assetPath = '';
 
-           operation.id = 'rotate';
-           operation.keys = [_t('operations.rotate.key')];
-           operation.title = _t('operations.rotate.title');
-           operation.behavior = behaviorOperation(context).which(operation);
+         _this.assetPath = function (val) {
+           if (!arguments.length) return _assetPath;
+           _assetPath = val;
+           return _this;
+         };
 
-           operation.mouseOnly = true;
+         var _assetMap = {};
 
-           return operation;
+         _this.assetMap = function (val) {
+           if (!arguments.length) return _assetMap;
+           _assetMap = val;
+           return _this;
+         };
+
+         _this.asset = function (val) {
+           if (/^http(s)?:\/\//i.test(val)) return val;
+           var filename = _assetPath + val;
+           return _assetMap[filename] || filename;
+         };
+
+         return _this;
        }
 
-       function modeMove(context, entityIDs, baseGraph) {
-           var mode = {
-               id: 'move',
-               button: 'browse'
-           };
+       var $findIndex$1 = arrayIteration.findIndex;
 
-           var keybinding = utilKeybinding('move');
-           var behaviors = [
-               behaviorEdit(context),
-               operationCircularize(context, entityIDs).behavior,
-               operationDelete(context, entityIDs).behavior,
-               operationOrthogonalize(context, entityIDs).behavior,
-               operationReflectLong(context, entityIDs).behavior,
-               operationReflectShort(context, entityIDs).behavior,
-               operationRotate(context, entityIDs).behavior
-           ];
-           var annotation = entityIDs.length === 1 ?
-               _t('operations.move.annotation.' + context.graph().geometry(entityIDs[0])) :
-               _t('operations.move.annotation.multiple');
-
-           var _prevGraph;
-           var _cache;
-           var _origin;
-           var _nudgeInterval;
-
-
-           function doMove(nudge) {
-               nudge = nudge || [0, 0];
-
-               var fn;
-               if (_prevGraph !== context.graph()) {
-                   _cache = {};
-                   _origin = context.map().mouseCoordinates();
-                   fn = context.perform;
-               } else {
-                   fn = context.overwrite;
-               }
 
-               var currMouse = context.map().mouse();
-               var origMouse = context.projection(_origin);
-               var delta = geoVecSubtract(geoVecSubtract(currMouse, origMouse), nudge);
 
-               fn(actionMove(entityIDs, delta, context.projection, _cache));
-               _prevGraph = context.graph();
-           }
+       var FIND_INDEX = 'findIndex';
+       var SKIPS_HOLES$1 = true;
 
+       var USES_TO_LENGTH$b = arrayMethodUsesToLength(FIND_INDEX);
 
-           function startNudge(nudge) {
-               if (_nudgeInterval) window.clearInterval(_nudgeInterval);
-               _nudgeInterval = window.setInterval(function() {
-                   context.map().pan(nudge);
-                   doMove(nudge);
-               }, 50);
-           }
+       // Shouldn't skip holes
+       if (FIND_INDEX in []) Array(1)[FIND_INDEX](function () { SKIPS_HOLES$1 = false; });
 
+       // `Array.prototype.findIndex` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.findindex
+       _export({ target: 'Array', proto: true, forced: SKIPS_HOLES$1 || !USES_TO_LENGTH$b }, {
+         findIndex: function findIndex(callbackfn /* , that = undefined */) {
+           return $findIndex$1(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
+         }
+       });
 
-           function stopNudge() {
-               if (_nudgeInterval) {
-                   window.clearInterval(_nudgeInterval);
-                   _nudgeInterval = null;
-               }
-           }
+       // https://tc39.github.io/ecma262/#sec-array.prototype-@@unscopables
+       addToUnscopables(FIND_INDEX);
 
+       var $includes$1 = arrayIncludes.includes;
 
-           function move() {
-               doMove();
-               var nudge = geoViewportEdge(context.map().mouse(), context.map().dimensions());
-               if (nudge) {
-                   startNudge(nudge);
-               } else {
-                   stopNudge();
-               }
-           }
 
 
-           function finish() {
-               event.stopPropagation();
-               context.replace(actionNoop(), annotation);
-               context.enter(modeSelect(context, entityIDs));
-               stopNudge();
-           }
+       var USES_TO_LENGTH$c = arrayMethodUsesToLength('indexOf', { ACCESSORS: true, 1: 0 });
 
+       // `Array.prototype.includes` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.includes
+       _export({ target: 'Array', proto: true, forced: !USES_TO_LENGTH$c }, {
+         includes: function includes(el /* , fromIndex = 0 */) {
+           return $includes$1(this, el, arguments.length > 1 ? arguments[1] : undefined);
+         }
+       });
 
-           function cancel() {
-               if (baseGraph) {
-                   while (context.graph() !== baseGraph) context.pop();
-                   context.enter(modeBrowse(context));
-               } else {
-                   context.pop();
-                   context.enter(modeSelect(context, entityIDs));
-               }
-               stopNudge();
-           }
+       // https://tc39.github.io/ecma262/#sec-array.prototype-@@unscopables
+       addToUnscopables('includes');
 
+       var notARegexp = function (it) {
+         if (isRegexp(it)) {
+           throw TypeError("The method doesn't accept regular expressions");
+         } return it;
+       };
 
-           function undone() {
-               context.enter(modeBrowse(context));
-           }
+       var MATCH$2 = wellKnownSymbol('match');
 
+       var correctIsRegexpLogic = function (METHOD_NAME) {
+         var regexp = /./;
+         try {
+           '/./'[METHOD_NAME](regexp);
+         } catch (e) {
+           try {
+             regexp[MATCH$2] = false;
+             return '/./'[METHOD_NAME](regexp);
+           } catch (f) { /* empty */ }
+         } return false;
+       };
 
-           mode.enter = function() {
-               _origin = context.map().mouseCoordinates();
-               _prevGraph = null;
-               _cache = {};
+       // `String.prototype.includes` method
+       // https://tc39.github.io/ecma262/#sec-string.prototype.includes
+       _export({ target: 'String', proto: true, forced: !correctIsRegexpLogic('includes') }, {
+         includes: function includes(searchString /* , position = 0 */) {
+           return !!~String(requireObjectCoercible(this))
+             .indexOf(notARegexp(searchString), arguments.length > 1 ? arguments[1] : undefined);
+         }
+       });
 
-               context.features().forceVisible(entityIDs);
+       var _detected;
 
-               behaviors.forEach(context.install);
+       function utilDetect(refresh) {
+         if (_detected && !refresh) return _detected;
+         _detected = {};
+         var ua = navigator.userAgent;
+         var m = null;
+         /* Browser */
 
-               context.surface()
-                   .on('mousemove.move', move)
-                   .on('click.move', finish);
+         m = ua.match(/(edge)\/?\s*(\.?\d+(\.\d+)*)/i); // Edge
 
-               context.history()
-                   .on('undone.move', undone);
+         if (m !== null) {
+           _detected.browser = m[1];
+           _detected.version = m[2];
+         }
 
-               keybinding
-                   .on('⎋', cancel)
-                   .on('↩', finish);
+         if (!_detected.browser) {
+           m = ua.match(/Trident\/.*rv:([0-9]{1,}[\.0-9]{0,})/i); // IE11
 
-               select(document)
-                   .call(keybinding);
-           };
+           if (m !== null) {
+             _detected.browser = 'msie';
+             _detected.version = m[1];
+           }
+         }
 
+         if (!_detected.browser) {
+           m = ua.match(/(opr)\/?\s*(\.?\d+(\.\d+)*)/i); // Opera 15+
 
-           mode.exit = function() {
-               stopNudge();
+           if (m !== null) {
+             _detected.browser = 'Opera';
+             _detected.version = m[2];
+           }
+         }
 
-               behaviors.forEach(function(behavior) {
-                   context.uninstall(behavior);
-               });
+         if (!_detected.browser) {
+           m = ua.match(/(opera|chrome|safari|firefox|msie)\/?\s*(\.?\d+(\.\d+)*)/i);
 
-               context.surface()
-                   .on('mousemove.move', null)
-                   .on('click.move', null);
+           if (m !== null) {
+             _detected.browser = m[1];
+             _detected.version = m[2];
+             m = ua.match(/version\/([\.\d]+)/i);
+             if (m !== null) _detected.version = m[1];
+           }
+         }
 
-               context.history()
-                   .on('undone.move', null);
+         if (!_detected.browser) {
+           _detected.browser = navigator.appName;
+           _detected.version = navigator.appVersion;
+         } // keep major.minor version only..
 
-               select(document)
-                   .call(keybinding.unbind);
 
-               context.features().forceVisible([]);
-           };
+         _detected.version = _detected.version.split(/\W/).slice(0, 2).join('.'); // detect other browser capabilities
+         // Legacy Opera has incomplete svg style support. See #715
 
+         _detected.opera = _detected.browser.toLowerCase() === 'opera' && parseFloat(_detected.version) < 15;
 
-           mode.selectedIDs = function() {
-               if (!arguments.length) return entityIDs;
-               // no assign
-               return mode;
-           };
+         if (_detected.browser.toLowerCase() === 'msie') {
+           _detected.ie = true;
+           _detected.browser = 'Internet Explorer';
+           _detected.support = parseFloat(_detected.version) >= 11;
+         } else {
+           _detected.ie = false;
+           _detected.support = true;
+         }
 
+         _detected.filedrop = window.FileReader && 'ondrop' in window;
+         _detected.download = !(_detected.ie || _detected.browser.toLowerCase() === 'edge');
+         _detected.cssfilters = !(_detected.ie || _detected.browser.toLowerCase() === 'edge');
+         /* Platform */
 
-           return mode;
-       }
+         if (/Win/.test(ua)) {
+           _detected.os = 'win';
+           _detected.platform = 'Windows';
+         } else if (/Mac/.test(ua)) {
+           _detected.os = 'mac';
+           _detected.platform = 'Macintosh';
+         } else if (/X11/.test(ua) || /Linux/.test(ua)) {
+           _detected.os = 'linux';
+           _detected.platform = 'Linux';
+         } else {
+           _detected.os = 'win';
+           _detected.platform = 'Unknown';
+         }
 
-       // see also `operationPaste`
-       function behaviorPaste(context) {
+         _detected.isMobileWebKit = (/\b(iPad|iPhone|iPod)\b/.test(ua) || // HACK: iPadOS 13+ requests desktop sites by default by using a Mac user agent,
+         // so assume any "mac" with multitouch is actually iOS
+         navigator.platform === 'MacIntel' && 'maxTouchPoints' in navigator && navigator.maxTouchPoints > 1) && /WebKit/.test(ua) && !/Edge/.test(ua) && !window.MSStream;
+         /* Locale */
+         // An array of locales requested by the browser in priority order.
 
-           function doPaste() {
-               // prevent paste during low zoom selection
-               if (!context.map().withinEditableZoom()) return;
+         _detected.browserLocales = Array.from(new Set( // remove duplicates
+         [navigator.language].concat(navigator.languages || []).concat([// old property for backwards compatibility
+         navigator.userLanguage]) // remove any undefined values
+         .filter(Boolean)));
+         /* Host */
 
-               event.preventDefault();
+         var loc = window.top.location;
+         var origin = loc.origin;
 
-               var baseGraph = context.graph();
-               var mouse = context.map().mouse();
-               var projection = context.projection;
-               var viewport = geoExtent(projection.clipExtent()).polygon();
+         if (!origin) {
+           // for unpatched IE11
+           origin = loc.protocol + '//' + loc.hostname + (loc.port ? ':' + loc.port : '');
+         }
+
+         _detected.host = origin + loc.pathname;
+         return _detected;
+       }
 
-               if (!geoPointInPolygon(mouse, viewport)) return;
+       var getOwnPropertyNames$2 = objectGetOwnPropertyNames.f;
+       var getOwnPropertyDescriptor$3 = objectGetOwnPropertyDescriptor.f;
+       var defineProperty$a = objectDefineProperty.f;
+       var trim$2 = stringTrim.trim;
+
+       var NUMBER = 'Number';
+       var NativeNumber = global_1[NUMBER];
+       var NumberPrototype = NativeNumber.prototype;
+
+       // Opera ~12 has broken Object#toString
+       var BROKEN_CLASSOF = classofRaw(objectCreate(NumberPrototype)) == NUMBER;
+
+       // `ToNumber` abstract operation
+       // https://tc39.github.io/ecma262/#sec-tonumber
+       var toNumber = function (argument) {
+         var it = toPrimitive(argument, false);
+         var first, third, radix, maxCode, digits, length, index, code;
+         if (typeof it == 'string' && it.length > 2) {
+           it = trim$2(it);
+           first = it.charCodeAt(0);
+           if (first === 43 || first === 45) {
+             third = it.charCodeAt(2);
+             if (third === 88 || third === 120) return NaN; // Number('+0x1') should be NaN, old V8 fix
+           } else if (first === 48) {
+             switch (it.charCodeAt(1)) {
+               case 66: case 98: radix = 2; maxCode = 49; break; // fast equal of /^0b[01]+$/i
+               case 79: case 111: radix = 8; maxCode = 55; break; // fast equal of /^0o[0-7]+$/i
+               default: return +it;
+             }
+             digits = it.slice(2);
+             length = digits.length;
+             for (index = 0; index < length; index++) {
+               code = digits.charCodeAt(index);
+               // parseInt parses a string to a first unavailable symbol
+               // but ToNumber should return NaN if a string contains unavailable symbols
+               if (code < 48 || code > maxCode) return NaN;
+             } return parseInt(digits, radix);
+           }
+         } return +it;
+       };
+
+       // `Number` constructor
+       // https://tc39.github.io/ecma262/#sec-number-constructor
+       if (isForced_1(NUMBER, !NativeNumber(' 0o1') || !NativeNumber('0b1') || NativeNumber('+0x1'))) {
+         var NumberWrapper = function Number(value) {
+           var it = arguments.length < 1 ? 0 : value;
+           var dummy = this;
+           return dummy instanceof NumberWrapper
+             // check on 1..constructor(foo) case
+             && (BROKEN_CLASSOF ? fails(function () { NumberPrototype.valueOf.call(dummy); }) : classofRaw(dummy) != NUMBER)
+               ? inheritIfRequired(new NativeNumber(toNumber(it)), dummy, NumberWrapper) : toNumber(it);
+         };
+         for (var keys$3 = descriptors ? getOwnPropertyNames$2(NativeNumber) : (
+           // ES3:
+           'MAX_VALUE,MIN_VALUE,NaN,NEGATIVE_INFINITY,POSITIVE_INFINITY,' +
+           // ES2015 (in case, if modules with ES2015 Number statics required before):
+           'EPSILON,isFinite,isInteger,isNaN,isSafeInteger,MAX_SAFE_INTEGER,' +
+           'MIN_SAFE_INTEGER,parseFloat,parseInt,isInteger'
+         ).split(','), j$2 = 0, key$1; keys$3.length > j$2; j$2++) {
+           if (has(NativeNumber, key$1 = keys$3[j$2]) && !has(NumberWrapper, key$1)) {
+             defineProperty$a(NumberWrapper, key$1, getOwnPropertyDescriptor$3(NativeNumber, key$1));
+           }
+         }
+         NumberWrapper.prototype = NumberPrototype;
+         NumberPrototype.constructor = NumberWrapper;
+         redefine(global_1, NUMBER, NumberWrapper);
+       }
+
+       // `Number.MAX_SAFE_INTEGER` constant
+       // https://tc39.github.io/ecma262/#sec-number.max_safe_integer
+       _export({ target: 'Number', stat: true }, {
+         MAX_SAFE_INTEGER: 0x1FFFFFFFFFFFFF
+       });
 
-               var oldIDs = context.copyIDs();
-               if (!oldIDs.length) return;
+       var aesJs = createCommonjsModule(function (module, exports) {
+         /*! MIT License. Copyright 2015-2018 Richard Moore <me@ricmoo.com>. See LICENSE.txt. */
+         (function (root) {
 
-               var extent = geoExtent();
-               var oldGraph = context.copyGraph();
-               var newIDs = [];
+           function checkInt(value) {
+             return parseInt(value) === value;
+           }
+
+           function checkInts(arrayish) {
+             if (!checkInt(arrayish.length)) {
+               return false;
+             }
 
-               var action = actionCopyEntities(oldIDs, oldGraph);
-               context.perform(action);
+             for (var i = 0; i < arrayish.length; i++) {
+               if (!checkInt(arrayish[i]) || arrayish[i] < 0 || arrayish[i] > 255) {
+                 return false;
+               }
+             }
 
-               var copies = action.copies();
-               var originals = new Set();
-               Object.values(copies).forEach(function(entity) { originals.add(entity.id); });
+             return true;
+           }
 
-               for (var id in copies) {
-                   var oldEntity = oldGraph.entity(id);
-                   var newEntity = copies[id];
+           function coerceArray(arg, copy) {
+             // ArrayBuffer view
+             if (arg.buffer && arg.name === 'Uint8Array') {
+               if (copy) {
+                 if (arg.slice) {
+                   arg = arg.slice();
+                 } else {
+                   arg = Array.prototype.slice.call(arg);
+                 }
+               }
 
-                   extent._extend(oldEntity.extent(oldGraph));
+               return arg;
+             } // It's an array; check it is a valid representation of a byte
 
-                   // Exclude child nodes from newIDs if their parent way was also copied.
-                   var parents = context.graph().parentWays(newEntity);
-                   var parentCopied = parents.some(function(parent) {
-                       return originals.has(parent.id);
-                   });
 
-                   if (!parentCopied) {
-                       newIDs.push(newEntity.id);
-                   }
+             if (Array.isArray(arg)) {
+               if (!checkInts(arg)) {
+                 throw new Error('Array contains invalid value: ' + arg);
                }
 
-               // Put pasted objects where mouse pointer is..
-               var copyPoint = (context.copyLonLat() && projection(context.copyLonLat())) || projection(extent.center());
-               var delta = geoVecSubtract(mouse, copyPoint);
+               return new Uint8Array(arg);
+             } // Something else, but behaves like an array (maybe a Buffer? Arguments?)
 
-               context.perform(actionMove(newIDs, delta, projection));
-               context.enter(modeMove(context, newIDs, baseGraph));
-           }
 
+             if (checkInt(arg.length) && checkInts(arg)) {
+               return new Uint8Array(arg);
+             }
 
-           function behavior() {
-               context.keybinding().on(uiCmd('⌘V'), doPaste);
-               return behavior;
+             throw new Error('unsupported array-like object');
            }
 
+           function createArray(length) {
+             return new Uint8Array(length);
+           }
 
-           behavior.off = function() {
-               context.keybinding().off(uiCmd('⌘V'));
-           };
+           function copyArray(sourceArray, targetArray, targetStart, sourceStart, sourceEnd) {
+             if (sourceStart != null || sourceEnd != null) {
+               if (sourceArray.slice) {
+                 sourceArray = sourceArray.slice(sourceStart, sourceEnd);
+               } else {
+                 sourceArray = Array.prototype.slice.call(sourceArray, sourceStart, sourceEnd);
+               }
+             }
 
+             targetArray.set(sourceArray, targetStart);
+           }
 
-           return behavior;
-       }
+           var convertUtf8 = function () {
+             function toBytes(text) {
+               var result = [],
+                   i = 0;
+               text = encodeURI(text);
 
-       /*
-           `behaviorDrag` is like `d3_behavior.drag`, with the following differences:
+               while (i < text.length) {
+                 var c = text.charCodeAt(i++); // if it is a % sign, encode the following 2 bytes as a hex value
 
-           * The `origin` function is expected to return an [x, y] tuple rather than an
-             {x, y} object.
-           * The events are `start`, `move`, and `end`.
-             (https://github.com/mbostock/d3/issues/563)
-           * The `start` event is not dispatched until the first cursor movement occurs.
-             (https://github.com/mbostock/d3/pull/368)
-           * The `move` event has a `point` and `delta` [x, y] tuple properties rather
-             than `x`, `y`, `dx`, and `dy` properties.
-           * The `end` event is not dispatched if no movement occurs.
-           * An `off` function is available that unbinds the drag's internal event handlers.
-        */
+                 if (c === 37) {
+                   result.push(parseInt(text.substr(i, 2), 16));
+                   i += 2; // otherwise, just the actual byte
+                 } else {
+                   result.push(c);
+                 }
+               }
 
-       function behaviorDrag() {
-           var dispatch$1 = dispatch('start', 'move', 'end');
-
-           // see also behaviorSelect
-           var _tolerancePx = 1; // keep this low to facilitate pixel-perfect micromapping
-           var _penTolerancePx = 4; // styluses can be touchy so require greater movement - #1981
-
-           var _origin = null;
-           var _selector = '';
-           var _event;
-           var _target;
-           var _surface;
-           var _pointerId;
-
-           // use pointer events on supported platforms; fallback to mouse events
-           var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
-
-           var d3_event_userSelectProperty = utilPrefixCSSProperty('UserSelect');
-           var d3_event_userSelectSuppress = function() {
-                   var selection$1 = selection();
-                   var select = selection$1.style(d3_event_userSelectProperty);
-                   selection$1.style(d3_event_userSelectProperty, 'none');
-                   return function() {
-                       selection$1.style(d3_event_userSelectProperty, select);
-                   };
-               };
+               return coerceArray(result);
+             }
 
+             function fromBytes(bytes) {
+               var result = [],
+                   i = 0;
 
-           function eventOf(thiz, argumentz) {
-               return function(e1) {
-                   e1.target = behavior;
-                   customEvent(e1, dispatch$1.apply, dispatch$1, [e1.type, thiz, argumentz]);
-               };
-           }
+               while (i < bytes.length) {
+                 var c = bytes[i];
+
+                 if (c < 128) {
+                   result.push(String.fromCharCode(c));
+                   i++;
+                 } else if (c > 191 && c < 224) {
+                   result.push(String.fromCharCode((c & 0x1f) << 6 | bytes[i + 1] & 0x3f));
+                   i += 2;
+                 } else {
+                   result.push(String.fromCharCode((c & 0x0f) << 12 | (bytes[i + 1] & 0x3f) << 6 | bytes[i + 2] & 0x3f));
+                   i += 3;
+                 }
+               }
 
+               return result.join('');
+             }
 
-           function pointerdown() {
+             return {
+               toBytes: toBytes,
+               fromBytes: fromBytes
+             };
+           }();
 
-               if (_pointerId) return;
+           var convertHex = function () {
+             function toBytes(text) {
+               var result = [];
 
-               _pointerId = event.pointerId || 'mouse';
+               for (var i = 0; i < text.length; i += 2) {
+                 result.push(parseInt(text.substr(i, 2), 16));
+               }
 
-               _target = this;
-               _event = eventOf(_target, arguments);
+               return result;
+             } // http://ixti.net/development/javascript/2011/11/11/base64-encodedecode-of-utf8-in-browser-with-js.html
 
-               // only force reflow once per drag
-               var pointerLocGetter = utilFastMouse(_surface || _target.parentNode);
 
-               var offset;
-               var startOrigin = pointerLocGetter(event);
-               var started = false;
-               var selectEnable = d3_event_userSelectSuppress();
+             var Hex = '0123456789abcdef';
 
-               select(window)
-                   .on(_pointerPrefix + 'move.drag', pointermove)
-                   .on(_pointerPrefix + 'up.drag pointercancel.drag', pointerup, true);
+             function fromBytes(bytes) {
+               var result = [];
 
-               if (_origin) {
-                   offset = _origin.apply(_target, arguments);
-                   offset = [offset[0] - startOrigin[0], offset[1] - startOrigin[1]];
-               } else {
-                   offset = [0, 0];
+               for (var i = 0; i < bytes.length; i++) {
+                 var v = bytes[i];
+                 result.push(Hex[(v & 0xf0) >> 4] + Hex[v & 0x0f]);
                }
 
-               event.stopPropagation();
+               return result.join('');
+             }
 
+             return {
+               toBytes: toBytes,
+               fromBytes: fromBytes
+             };
+           }(); // Number of rounds by keysize
 
-               function pointermove() {
-                   if (_pointerId !== (event.pointerId || 'mouse')) return;
 
-                   var p = pointerLocGetter(event);
+           var numberOfRounds = {
+             16: 10,
+             24: 12,
+             32: 14
+           }; // Round constant words
 
-                   if (!started) {
-                       var dist = geoVecLength(startOrigin,  p);
-                       var tolerance = event.pointerType === 'pen' ? _penTolerancePx : _tolerancePx;
-                       // don't start until the drag has actually moved somewhat
-                       if (dist < tolerance) return;
+           var rcon = [0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91]; // S-box and Inverse S-box (S is for Substitution)
 
-                       started = true;
-                       _event({ type: 'start' });
+           var S = [0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76, 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15, 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75, 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf, 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8, 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73, 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb, 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08, 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a, 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf, 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16];
+           var Si = [0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb, 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, 0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e, 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92, 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84, 0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06, 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, 0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73, 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e, 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4, 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef, 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d]; // Transformations for encryption
 
-                   // Don't send a `move` event in the same cycle as `start` since dragging
-                   // a midpoint will convert the target to a node.
-                   } else {
+           var T1 = [0xc66363a5, 0xf87c7c84, 0xee777799, 0xf67b7b8d, 0xfff2f20d, 0xd66b6bbd, 0xde6f6fb1, 0x91c5c554, 0x60303050, 0x02010103, 0xce6767a9, 0x562b2b7d, 0xe7fefe19, 0xb5d7d762, 0x4dababe6, 0xec76769a, 0x8fcaca45, 0x1f82829d, 0x89c9c940, 0xfa7d7d87, 0xeffafa15, 0xb25959eb, 0x8e4747c9, 0xfbf0f00b, 0x41adadec, 0xb3d4d467, 0x5fa2a2fd, 0x45afafea, 0x239c9cbf, 0x53a4a4f7, 0xe4727296, 0x9bc0c05b, 0x75b7b7c2, 0xe1fdfd1c, 0x3d9393ae, 0x4c26266a, 0x6c36365a, 0x7e3f3f41, 0xf5f7f702, 0x83cccc4f, 0x6834345c, 0x51a5a5f4, 0xd1e5e534, 0xf9f1f108, 0xe2717193, 0xabd8d873, 0x62313153, 0x2a15153f, 0x0804040c, 0x95c7c752, 0x46232365, 0x9dc3c35e, 0x30181828, 0x379696a1, 0x0a05050f, 0x2f9a9ab5, 0x0e070709, 0x24121236, 0x1b80809b, 0xdfe2e23d, 0xcdebeb26, 0x4e272769, 0x7fb2b2cd, 0xea75759f, 0x1209091b, 0x1d83839e, 0x582c2c74, 0x341a1a2e, 0x361b1b2d, 0xdc6e6eb2, 0xb45a5aee, 0x5ba0a0fb, 0xa45252f6, 0x763b3b4d, 0xb7d6d661, 0x7db3b3ce, 0x5229297b, 0xdde3e33e, 0x5e2f2f71, 0x13848497, 0xa65353f5, 0xb9d1d168, 0x00000000, 0xc1eded2c, 0x40202060, 0xe3fcfc1f, 0x79b1b1c8, 0xb65b5bed, 0xd46a6abe, 0x8dcbcb46, 0x67bebed9, 0x7239394b, 0x944a4ade, 0x984c4cd4, 0xb05858e8, 0x85cfcf4a, 0xbbd0d06b, 0xc5efef2a, 0x4faaaae5, 0xedfbfb16, 0x864343c5, 0x9a4d4dd7, 0x66333355, 0x11858594, 0x8a4545cf, 0xe9f9f910, 0x04020206, 0xfe7f7f81, 0xa05050f0, 0x783c3c44, 0x259f9fba, 0x4ba8a8e3, 0xa25151f3, 0x5da3a3fe, 0x804040c0, 0x058f8f8a, 0x3f9292ad, 0x219d9dbc, 0x70383848, 0xf1f5f504, 0x63bcbcdf, 0x77b6b6c1, 0xafdada75, 0x42212163, 0x20101030, 0xe5ffff1a, 0xfdf3f30e, 0xbfd2d26d, 0x81cdcd4c, 0x180c0c14, 0x26131335, 0xc3ecec2f, 0xbe5f5fe1, 0x359797a2, 0x884444cc, 0x2e171739, 0x93c4c457, 0x55a7a7f2, 0xfc7e7e82, 0x7a3d3d47, 0xc86464ac, 0xba5d5de7, 0x3219192b, 0xe6737395, 0xc06060a0, 0x19818198, 0x9e4f4fd1, 0xa3dcdc7f, 0x44222266, 0x542a2a7e, 0x3b9090ab, 0x0b888883, 0x8c4646ca, 0xc7eeee29, 0x6bb8b8d3, 0x2814143c, 0xa7dede79, 0xbc5e5ee2, 0x160b0b1d, 0xaddbdb76, 0xdbe0e03b, 0x64323256, 0x743a3a4e, 0x140a0a1e, 0x924949db, 0x0c06060a, 0x4824246c, 0xb85c5ce4, 0x9fc2c25d, 0xbdd3d36e, 0x43acacef, 0xc46262a6, 0x399191a8, 0x319595a4, 0xd3e4e437, 0xf279798b, 0xd5e7e732, 0x8bc8c843, 0x6e373759, 0xda6d6db7, 0x018d8d8c, 0xb1d5d564, 0x9c4e4ed2, 0x49a9a9e0, 0xd86c6cb4, 0xac5656fa, 0xf3f4f407, 0xcfeaea25, 0xca6565af, 0xf47a7a8e, 0x47aeaee9, 0x10080818, 0x6fbabad5, 0xf0787888, 0x4a25256f, 0x5c2e2e72, 0x381c1c24, 0x57a6a6f1, 0x73b4b4c7, 0x97c6c651, 0xcbe8e823, 0xa1dddd7c, 0xe874749c, 0x3e1f1f21, 0x964b4bdd, 0x61bdbddc, 0x0d8b8b86, 0x0f8a8a85, 0xe0707090, 0x7c3e3e42, 0x71b5b5c4, 0xcc6666aa, 0x904848d8, 0x06030305, 0xf7f6f601, 0x1c0e0e12, 0xc26161a3, 0x6a35355f, 0xae5757f9, 0x69b9b9d0, 0x17868691, 0x99c1c158, 0x3a1d1d27, 0x279e9eb9, 0xd9e1e138, 0xebf8f813, 0x2b9898b3, 0x22111133, 0xd26969bb, 0xa9d9d970, 0x078e8e89, 0x339494a7, 0x2d9b9bb6, 0x3c1e1e22, 0x15878792, 0xc9e9e920, 0x87cece49, 0xaa5555ff, 0x50282878, 0xa5dfdf7a, 0x038c8c8f, 0x59a1a1f8, 0x09898980, 0x1a0d0d17, 0x65bfbfda, 0xd7e6e631, 0x844242c6, 0xd06868b8, 0x824141c3, 0x299999b0, 0x5a2d2d77, 0x1e0f0f11, 0x7bb0b0cb, 0xa85454fc, 0x6dbbbbd6, 0x2c16163a];
+           var T2 = [0xa5c66363, 0x84f87c7c, 0x99ee7777, 0x8df67b7b, 0x0dfff2f2, 0xbdd66b6b, 0xb1de6f6f, 0x5491c5c5, 0x50603030, 0x03020101, 0xa9ce6767, 0x7d562b2b, 0x19e7fefe, 0x62b5d7d7, 0xe64dabab, 0x9aec7676, 0x458fcaca, 0x9d1f8282, 0x4089c9c9, 0x87fa7d7d, 0x15effafa, 0xebb25959, 0xc98e4747, 0x0bfbf0f0, 0xec41adad, 0x67b3d4d4, 0xfd5fa2a2, 0xea45afaf, 0xbf239c9c, 0xf753a4a4, 0x96e47272, 0x5b9bc0c0, 0xc275b7b7, 0x1ce1fdfd, 0xae3d9393, 0x6a4c2626, 0x5a6c3636, 0x417e3f3f, 0x02f5f7f7, 0x4f83cccc, 0x5c683434, 0xf451a5a5, 0x34d1e5e5, 0x08f9f1f1, 0x93e27171, 0x73abd8d8, 0x53623131, 0x3f2a1515, 0x0c080404, 0x5295c7c7, 0x65462323, 0x5e9dc3c3, 0x28301818, 0xa1379696, 0x0f0a0505, 0xb52f9a9a, 0x090e0707, 0x36241212, 0x9b1b8080, 0x3ddfe2e2, 0x26cdebeb, 0x694e2727, 0xcd7fb2b2, 0x9fea7575, 0x1b120909, 0x9e1d8383, 0x74582c2c, 0x2e341a1a, 0x2d361b1b, 0xb2dc6e6e, 0xeeb45a5a, 0xfb5ba0a0, 0xf6a45252, 0x4d763b3b, 0x61b7d6d6, 0xce7db3b3, 0x7b522929, 0x3edde3e3, 0x715e2f2f, 0x97138484, 0xf5a65353, 0x68b9d1d1, 0x00000000, 0x2cc1eded, 0x60402020, 0x1fe3fcfc, 0xc879b1b1, 0xedb65b5b, 0xbed46a6a, 0x468dcbcb, 0xd967bebe, 0x4b723939, 0xde944a4a, 0xd4984c4c, 0xe8b05858, 0x4a85cfcf, 0x6bbbd0d0, 0x2ac5efef, 0xe54faaaa, 0x16edfbfb, 0xc5864343, 0xd79a4d4d, 0x55663333, 0x94118585, 0xcf8a4545, 0x10e9f9f9, 0x06040202, 0x81fe7f7f, 0xf0a05050, 0x44783c3c, 0xba259f9f, 0xe34ba8a8, 0xf3a25151, 0xfe5da3a3, 0xc0804040, 0x8a058f8f, 0xad3f9292, 0xbc219d9d, 0x48703838, 0x04f1f5f5, 0xdf63bcbc, 0xc177b6b6, 0x75afdada, 0x63422121, 0x30201010, 0x1ae5ffff, 0x0efdf3f3, 0x6dbfd2d2, 0x4c81cdcd, 0x14180c0c, 0x35261313, 0x2fc3ecec, 0xe1be5f5f, 0xa2359797, 0xcc884444, 0x392e1717, 0x5793c4c4, 0xf255a7a7, 0x82fc7e7e, 0x477a3d3d, 0xacc86464, 0xe7ba5d5d, 0x2b321919, 0x95e67373, 0xa0c06060, 0x98198181, 0xd19e4f4f, 0x7fa3dcdc, 0x66442222, 0x7e542a2a, 0xab3b9090, 0x830b8888, 0xca8c4646, 0x29c7eeee, 0xd36bb8b8, 0x3c281414, 0x79a7dede, 0xe2bc5e5e, 0x1d160b0b, 0x76addbdb, 0x3bdbe0e0, 0x56643232, 0x4e743a3a, 0x1e140a0a, 0xdb924949, 0x0a0c0606, 0x6c482424, 0xe4b85c5c, 0x5d9fc2c2, 0x6ebdd3d3, 0xef43acac, 0xa6c46262, 0xa8399191, 0xa4319595, 0x37d3e4e4, 0x8bf27979, 0x32d5e7e7, 0x438bc8c8, 0x596e3737, 0xb7da6d6d, 0x8c018d8d, 0x64b1d5d5, 0xd29c4e4e, 0xe049a9a9, 0xb4d86c6c, 0xfaac5656, 0x07f3f4f4, 0x25cfeaea, 0xafca6565, 0x8ef47a7a, 0xe947aeae, 0x18100808, 0xd56fbaba, 0x88f07878, 0x6f4a2525, 0x725c2e2e, 0x24381c1c, 0xf157a6a6, 0xc773b4b4, 0x5197c6c6, 0x23cbe8e8, 0x7ca1dddd, 0x9ce87474, 0x213e1f1f, 0xdd964b4b, 0xdc61bdbd, 0x860d8b8b, 0x850f8a8a, 0x90e07070, 0x427c3e3e, 0xc471b5b5, 0xaacc6666, 0xd8904848, 0x05060303, 0x01f7f6f6, 0x121c0e0e, 0xa3c26161, 0x5f6a3535, 0xf9ae5757, 0xd069b9b9, 0x91178686, 0x5899c1c1, 0x273a1d1d, 0xb9279e9e, 0x38d9e1e1, 0x13ebf8f8, 0xb32b9898, 0x33221111, 0xbbd26969, 0x70a9d9d9, 0x89078e8e, 0xa7339494, 0xb62d9b9b, 0x223c1e1e, 0x92158787, 0x20c9e9e9, 0x4987cece, 0xffaa5555, 0x78502828, 0x7aa5dfdf, 0x8f038c8c, 0xf859a1a1, 0x80098989, 0x171a0d0d, 0xda65bfbf, 0x31d7e6e6, 0xc6844242, 0xb8d06868, 0xc3824141, 0xb0299999, 0x775a2d2d, 0x111e0f0f, 0xcb7bb0b0, 0xfca85454, 0xd66dbbbb, 0x3a2c1616];
+           var T3 = [0x63a5c663, 0x7c84f87c, 0x7799ee77, 0x7b8df67b, 0xf20dfff2, 0x6bbdd66b, 0x6fb1de6f, 0xc55491c5, 0x30506030, 0x01030201, 0x67a9ce67, 0x2b7d562b, 0xfe19e7fe, 0xd762b5d7, 0xabe64dab, 0x769aec76, 0xca458fca, 0x829d1f82, 0xc94089c9, 0x7d87fa7d, 0xfa15effa, 0x59ebb259, 0x47c98e47, 0xf00bfbf0, 0xadec41ad, 0xd467b3d4, 0xa2fd5fa2, 0xafea45af, 0x9cbf239c, 0xa4f753a4, 0x7296e472, 0xc05b9bc0, 0xb7c275b7, 0xfd1ce1fd, 0x93ae3d93, 0x266a4c26, 0x365a6c36, 0x3f417e3f, 0xf702f5f7, 0xcc4f83cc, 0x345c6834, 0xa5f451a5, 0xe534d1e5, 0xf108f9f1, 0x7193e271, 0xd873abd8, 0x31536231, 0x153f2a15, 0x040c0804, 0xc75295c7, 0x23654623, 0xc35e9dc3, 0x18283018, 0x96a13796, 0x050f0a05, 0x9ab52f9a, 0x07090e07, 0x12362412, 0x809b1b80, 0xe23ddfe2, 0xeb26cdeb, 0x27694e27, 0xb2cd7fb2, 0x759fea75, 0x091b1209, 0x839e1d83, 0x2c74582c, 0x1a2e341a, 0x1b2d361b, 0x6eb2dc6e, 0x5aeeb45a, 0xa0fb5ba0, 0x52f6a452, 0x3b4d763b, 0xd661b7d6, 0xb3ce7db3, 0x297b5229, 0xe33edde3, 0x2f715e2f, 0x84971384, 0x53f5a653, 0xd168b9d1, 0x00000000, 0xed2cc1ed, 0x20604020, 0xfc1fe3fc, 0xb1c879b1, 0x5bedb65b, 0x6abed46a, 0xcb468dcb, 0xbed967be, 0x394b7239, 0x4ade944a, 0x4cd4984c, 0x58e8b058, 0xcf4a85cf, 0xd06bbbd0, 0xef2ac5ef, 0xaae54faa, 0xfb16edfb, 0x43c58643, 0x4dd79a4d, 0x33556633, 0x85941185, 0x45cf8a45, 0xf910e9f9, 0x02060402, 0x7f81fe7f, 0x50f0a050, 0x3c44783c, 0x9fba259f, 0xa8e34ba8, 0x51f3a251, 0xa3fe5da3, 0x40c08040, 0x8f8a058f, 0x92ad3f92, 0x9dbc219d, 0x38487038, 0xf504f1f5, 0xbcdf63bc, 0xb6c177b6, 0xda75afda, 0x21634221, 0x10302010, 0xff1ae5ff, 0xf30efdf3, 0xd26dbfd2, 0xcd4c81cd, 0x0c14180c, 0x13352613, 0xec2fc3ec, 0x5fe1be5f, 0x97a23597, 0x44cc8844, 0x17392e17, 0xc45793c4, 0xa7f255a7, 0x7e82fc7e, 0x3d477a3d, 0x64acc864, 0x5de7ba5d, 0x192b3219, 0x7395e673, 0x60a0c060, 0x81981981, 0x4fd19e4f, 0xdc7fa3dc, 0x22664422, 0x2a7e542a, 0x90ab3b90, 0x88830b88, 0x46ca8c46, 0xee29c7ee, 0xb8d36bb8, 0x143c2814, 0xde79a7de, 0x5ee2bc5e, 0x0b1d160b, 0xdb76addb, 0xe03bdbe0, 0x32566432, 0x3a4e743a, 0x0a1e140a, 0x49db9249, 0x060a0c06, 0x246c4824, 0x5ce4b85c, 0xc25d9fc2, 0xd36ebdd3, 0xacef43ac, 0x62a6c462, 0x91a83991, 0x95a43195, 0xe437d3e4, 0x798bf279, 0xe732d5e7, 0xc8438bc8, 0x37596e37, 0x6db7da6d, 0x8d8c018d, 0xd564b1d5, 0x4ed29c4e, 0xa9e049a9, 0x6cb4d86c, 0x56faac56, 0xf407f3f4, 0xea25cfea, 0x65afca65, 0x7a8ef47a, 0xaee947ae, 0x08181008, 0xbad56fba, 0x7888f078, 0x256f4a25, 0x2e725c2e, 0x1c24381c, 0xa6f157a6, 0xb4c773b4, 0xc65197c6, 0xe823cbe8, 0xdd7ca1dd, 0x749ce874, 0x1f213e1f, 0x4bdd964b, 0xbddc61bd, 0x8b860d8b, 0x8a850f8a, 0x7090e070, 0x3e427c3e, 0xb5c471b5, 0x66aacc66, 0x48d89048, 0x03050603, 0xf601f7f6, 0x0e121c0e, 0x61a3c261, 0x355f6a35, 0x57f9ae57, 0xb9d069b9, 0x86911786, 0xc15899c1, 0x1d273a1d, 0x9eb9279e, 0xe138d9e1, 0xf813ebf8, 0x98b32b98, 0x11332211, 0x69bbd269, 0xd970a9d9, 0x8e89078e, 0x94a73394, 0x9bb62d9b, 0x1e223c1e, 0x87921587, 0xe920c9e9, 0xce4987ce, 0x55ffaa55, 0x28785028, 0xdf7aa5df, 0x8c8f038c, 0xa1f859a1, 0x89800989, 0x0d171a0d, 0xbfda65bf, 0xe631d7e6, 0x42c68442, 0x68b8d068, 0x41c38241, 0x99b02999, 0x2d775a2d, 0x0f111e0f, 0xb0cb7bb0, 0x54fca854, 0xbbd66dbb, 0x163a2c16];
+           var T4 = [0x6363a5c6, 0x7c7c84f8, 0x777799ee, 0x7b7b8df6, 0xf2f20dff, 0x6b6bbdd6, 0x6f6fb1de, 0xc5c55491, 0x30305060, 0x01010302, 0x6767a9ce, 0x2b2b7d56, 0xfefe19e7, 0xd7d762b5, 0xababe64d, 0x76769aec, 0xcaca458f, 0x82829d1f, 0xc9c94089, 0x7d7d87fa, 0xfafa15ef, 0x5959ebb2, 0x4747c98e, 0xf0f00bfb, 0xadadec41, 0xd4d467b3, 0xa2a2fd5f, 0xafafea45, 0x9c9cbf23, 0xa4a4f753, 0x727296e4, 0xc0c05b9b, 0xb7b7c275, 0xfdfd1ce1, 0x9393ae3d, 0x26266a4c, 0x36365a6c, 0x3f3f417e, 0xf7f702f5, 0xcccc4f83, 0x34345c68, 0xa5a5f451, 0xe5e534d1, 0xf1f108f9, 0x717193e2, 0xd8d873ab, 0x31315362, 0x15153f2a, 0x04040c08, 0xc7c75295, 0x23236546, 0xc3c35e9d, 0x18182830, 0x9696a137, 0x05050f0a, 0x9a9ab52f, 0x0707090e, 0x12123624, 0x80809b1b, 0xe2e23ddf, 0xebeb26cd, 0x2727694e, 0xb2b2cd7f, 0x75759fea, 0x09091b12, 0x83839e1d, 0x2c2c7458, 0x1a1a2e34, 0x1b1b2d36, 0x6e6eb2dc, 0x5a5aeeb4, 0xa0a0fb5b, 0x5252f6a4, 0x3b3b4d76, 0xd6d661b7, 0xb3b3ce7d, 0x29297b52, 0xe3e33edd, 0x2f2f715e, 0x84849713, 0x5353f5a6, 0xd1d168b9, 0x00000000, 0xeded2cc1, 0x20206040, 0xfcfc1fe3, 0xb1b1c879, 0x5b5bedb6, 0x6a6abed4, 0xcbcb468d, 0xbebed967, 0x39394b72, 0x4a4ade94, 0x4c4cd498, 0x5858e8b0, 0xcfcf4a85, 0xd0d06bbb, 0xefef2ac5, 0xaaaae54f, 0xfbfb16ed, 0x4343c586, 0x4d4dd79a, 0x33335566, 0x85859411, 0x4545cf8a, 0xf9f910e9, 0x02020604, 0x7f7f81fe, 0x5050f0a0, 0x3c3c4478, 0x9f9fba25, 0xa8a8e34b, 0x5151f3a2, 0xa3a3fe5d, 0x4040c080, 0x8f8f8a05, 0x9292ad3f, 0x9d9dbc21, 0x38384870, 0xf5f504f1, 0xbcbcdf63, 0xb6b6c177, 0xdada75af, 0x21216342, 0x10103020, 0xffff1ae5, 0xf3f30efd, 0xd2d26dbf, 0xcdcd4c81, 0x0c0c1418, 0x13133526, 0xecec2fc3, 0x5f5fe1be, 0x9797a235, 0x4444cc88, 0x1717392e, 0xc4c45793, 0xa7a7f255, 0x7e7e82fc, 0x3d3d477a, 0x6464acc8, 0x5d5de7ba, 0x19192b32, 0x737395e6, 0x6060a0c0, 0x81819819, 0x4f4fd19e, 0xdcdc7fa3, 0x22226644, 0x2a2a7e54, 0x9090ab3b, 0x8888830b, 0x4646ca8c, 0xeeee29c7, 0xb8b8d36b, 0x14143c28, 0xdede79a7, 0x5e5ee2bc, 0x0b0b1d16, 0xdbdb76ad, 0xe0e03bdb, 0x32325664, 0x3a3a4e74, 0x0a0a1e14, 0x4949db92, 0x06060a0c, 0x24246c48, 0x5c5ce4b8, 0xc2c25d9f, 0xd3d36ebd, 0xacacef43, 0x6262a6c4, 0x9191a839, 0x9595a431, 0xe4e437d3, 0x79798bf2, 0xe7e732d5, 0xc8c8438b, 0x3737596e, 0x6d6db7da, 0x8d8d8c01, 0xd5d564b1, 0x4e4ed29c, 0xa9a9e049, 0x6c6cb4d8, 0x5656faac, 0xf4f407f3, 0xeaea25cf, 0x6565afca, 0x7a7a8ef4, 0xaeaee947, 0x08081810, 0xbabad56f, 0x787888f0, 0x25256f4a, 0x2e2e725c, 0x1c1c2438, 0xa6a6f157, 0xb4b4c773, 0xc6c65197, 0xe8e823cb, 0xdddd7ca1, 0x74749ce8, 0x1f1f213e, 0x4b4bdd96, 0xbdbddc61, 0x8b8b860d, 0x8a8a850f, 0x707090e0, 0x3e3e427c, 0xb5b5c471, 0x6666aacc, 0x4848d890, 0x03030506, 0xf6f601f7, 0x0e0e121c, 0x6161a3c2, 0x35355f6a, 0x5757f9ae, 0xb9b9d069, 0x86869117, 0xc1c15899, 0x1d1d273a, 0x9e9eb927, 0xe1e138d9, 0xf8f813eb, 0x9898b32b, 0x11113322, 0x6969bbd2, 0xd9d970a9, 0x8e8e8907, 0x9494a733, 0x9b9bb62d, 0x1e1e223c, 0x87879215, 0xe9e920c9, 0xcece4987, 0x5555ffaa, 0x28287850, 0xdfdf7aa5, 0x8c8c8f03, 0xa1a1f859, 0x89898009, 0x0d0d171a, 0xbfbfda65, 0xe6e631d7, 0x4242c684, 0x6868b8d0, 0x4141c382, 0x9999b029, 0x2d2d775a, 0x0f0f111e, 0xb0b0cb7b, 0x5454fca8, 0xbbbbd66d, 0x16163a2c]; // Transformations for decryption
 
-                       startOrigin = p;
-                       event.stopPropagation();
-                       event.preventDefault();
+           var T5 = [0x51f4a750, 0x7e416553, 0x1a17a4c3, 0x3a275e96, 0x3bab6bcb, 0x1f9d45f1, 0xacfa58ab, 0x4be30393, 0x2030fa55, 0xad766df6, 0x88cc7691, 0xf5024c25, 0x4fe5d7fc, 0xc52acbd7, 0x26354480, 0xb562a38f, 0xdeb15a49, 0x25ba1b67, 0x45ea0e98, 0x5dfec0e1, 0xc32f7502, 0x814cf012, 0x8d4697a3, 0x6bd3f9c6, 0x038f5fe7, 0x15929c95, 0xbf6d7aeb, 0x955259da, 0xd4be832d, 0x587421d3, 0x49e06929, 0x8ec9c844, 0x75c2896a, 0xf48e7978, 0x99583e6b, 0x27b971dd, 0xbee14fb6, 0xf088ad17, 0xc920ac66, 0x7dce3ab4, 0x63df4a18, 0xe51a3182, 0x97513360, 0x62537f45, 0xb16477e0, 0xbb6bae84, 0xfe81a01c, 0xf9082b94, 0x70486858, 0x8f45fd19, 0x94de6c87, 0x527bf8b7, 0xab73d323, 0x724b02e2, 0xe31f8f57, 0x6655ab2a, 0xb2eb2807, 0x2fb5c203, 0x86c57b9a, 0xd33708a5, 0x302887f2, 0x23bfa5b2, 0x02036aba, 0xed16825c, 0x8acf1c2b, 0xa779b492, 0xf307f2f0, 0x4e69e2a1, 0x65daf4cd, 0x0605bed5, 0xd134621f, 0xc4a6fe8a, 0x342e539d, 0xa2f355a0, 0x058ae132, 0xa4f6eb75, 0x0b83ec39, 0x4060efaa, 0x5e719f06, 0xbd6e1051, 0x3e218af9, 0x96dd063d, 0xdd3e05ae, 0x4de6bd46, 0x91548db5, 0x71c45d05, 0x0406d46f, 0x605015ff, 0x1998fb24, 0xd6bde997, 0x894043cc, 0x67d99e77, 0xb0e842bd, 0x07898b88, 0xe7195b38, 0x79c8eedb, 0xa17c0a47, 0x7c420fe9, 0xf8841ec9, 0x00000000, 0x09808683, 0x322bed48, 0x1e1170ac, 0x6c5a724e, 0xfd0efffb, 0x0f853856, 0x3daed51e, 0x362d3927, 0x0a0fd964, 0x685ca621, 0x9b5b54d1, 0x24362e3a, 0x0c0a67b1, 0x9357e70f, 0xb4ee96d2, 0x1b9b919e, 0x80c0c54f, 0x61dc20a2, 0x5a774b69, 0x1c121a16, 0xe293ba0a, 0xc0a02ae5, 0x3c22e043, 0x121b171d, 0x0e090d0b, 0xf28bc7ad, 0x2db6a8b9, 0x141ea9c8, 0x57f11985, 0xaf75074c, 0xee99ddbb, 0xa37f60fd, 0xf701269f, 0x5c72f5bc, 0x44663bc5, 0x5bfb7e34, 0x8b432976, 0xcb23c6dc, 0xb6edfc68, 0xb8e4f163, 0xd731dcca, 0x42638510, 0x13972240, 0x84c61120, 0x854a247d, 0xd2bb3df8, 0xaef93211, 0xc729a16d, 0x1d9e2f4b, 0xdcb230f3, 0x0d8652ec, 0x77c1e3d0, 0x2bb3166c, 0xa970b999, 0x119448fa, 0x47e96422, 0xa8fc8cc4, 0xa0f03f1a, 0x567d2cd8, 0x223390ef, 0x87494ec7, 0xd938d1c1, 0x8ccaa2fe, 0x98d40b36, 0xa6f581cf, 0xa57ade28, 0xdab78e26, 0x3fadbfa4, 0x2c3a9de4, 0x5078920d, 0x6a5fcc9b, 0x547e4662, 0xf68d13c2, 0x90d8b8e8, 0x2e39f75e, 0x82c3aff5, 0x9f5d80be, 0x69d0937c, 0x6fd52da9, 0xcf2512b3, 0xc8ac993b, 0x10187da7, 0xe89c636e, 0xdb3bbb7b, 0xcd267809, 0x6e5918f4, 0xec9ab701, 0x834f9aa8, 0xe6956e65, 0xaaffe67e, 0x21bccf08, 0xef15e8e6, 0xbae79bd9, 0x4a6f36ce, 0xea9f09d4, 0x29b07cd6, 0x31a4b2af, 0x2a3f2331, 0xc6a59430, 0x35a266c0, 0x744ebc37, 0xfc82caa6, 0xe090d0b0, 0x33a7d815, 0xf104984a, 0x41ecdaf7, 0x7fcd500e, 0x1791f62f, 0x764dd68d, 0x43efb04d, 0xccaa4d54, 0xe49604df, 0x9ed1b5e3, 0x4c6a881b, 0xc12c1fb8, 0x4665517f, 0x9d5eea04, 0x018c355d, 0xfa877473, 0xfb0b412e, 0xb3671d5a, 0x92dbd252, 0xe9105633, 0x6dd64713, 0x9ad7618c, 0x37a10c7a, 0x59f8148e, 0xeb133c89, 0xcea927ee, 0xb761c935, 0xe11ce5ed, 0x7a47b13c, 0x9cd2df59, 0x55f2733f, 0x1814ce79, 0x73c737bf, 0x53f7cdea, 0x5ffdaa5b, 0xdf3d6f14, 0x7844db86, 0xcaaff381, 0xb968c43e, 0x3824342c, 0xc2a3405f, 0x161dc372, 0xbce2250c, 0x283c498b, 0xff0d9541, 0x39a80171, 0x080cb3de, 0xd8b4e49c, 0x6456c190, 0x7bcb8461, 0xd532b670, 0x486c5c74, 0xd0b85742];
+           var T6 = [0x5051f4a7, 0x537e4165, 0xc31a17a4, 0x963a275e, 0xcb3bab6b, 0xf11f9d45, 0xabacfa58, 0x934be303, 0x552030fa, 0xf6ad766d, 0x9188cc76, 0x25f5024c, 0xfc4fe5d7, 0xd7c52acb, 0x80263544, 0x8fb562a3, 0x49deb15a, 0x6725ba1b, 0x9845ea0e, 0xe15dfec0, 0x02c32f75, 0x12814cf0, 0xa38d4697, 0xc66bd3f9, 0xe7038f5f, 0x9515929c, 0xebbf6d7a, 0xda955259, 0x2dd4be83, 0xd3587421, 0x2949e069, 0x448ec9c8, 0x6a75c289, 0x78f48e79, 0x6b99583e, 0xdd27b971, 0xb6bee14f, 0x17f088ad, 0x66c920ac, 0xb47dce3a, 0x1863df4a, 0x82e51a31, 0x60975133, 0x4562537f, 0xe0b16477, 0x84bb6bae, 0x1cfe81a0, 0x94f9082b, 0x58704868, 0x198f45fd, 0x8794de6c, 0xb7527bf8, 0x23ab73d3, 0xe2724b02, 0x57e31f8f, 0x2a6655ab, 0x07b2eb28, 0x032fb5c2, 0x9a86c57b, 0xa5d33708, 0xf2302887, 0xb223bfa5, 0xba02036a, 0x5ced1682, 0x2b8acf1c, 0x92a779b4, 0xf0f307f2, 0xa14e69e2, 0xcd65daf4, 0xd50605be, 0x1fd13462, 0x8ac4a6fe, 0x9d342e53, 0xa0a2f355, 0x32058ae1, 0x75a4f6eb, 0x390b83ec, 0xaa4060ef, 0x065e719f, 0x51bd6e10, 0xf93e218a, 0x3d96dd06, 0xaedd3e05, 0x464de6bd, 0xb591548d, 0x0571c45d, 0x6f0406d4, 0xff605015, 0x241998fb, 0x97d6bde9, 0xcc894043, 0x7767d99e, 0xbdb0e842, 0x8807898b, 0x38e7195b, 0xdb79c8ee, 0x47a17c0a, 0xe97c420f, 0xc9f8841e, 0x00000000, 0x83098086, 0x48322bed, 0xac1e1170, 0x4e6c5a72, 0xfbfd0eff, 0x560f8538, 0x1e3daed5, 0x27362d39, 0x640a0fd9, 0x21685ca6, 0xd19b5b54, 0x3a24362e, 0xb10c0a67, 0x0f9357e7, 0xd2b4ee96, 0x9e1b9b91, 0x4f80c0c5, 0xa261dc20, 0x695a774b, 0x161c121a, 0x0ae293ba, 0xe5c0a02a, 0x433c22e0, 0x1d121b17, 0x0b0e090d, 0xadf28bc7, 0xb92db6a8, 0xc8141ea9, 0x8557f119, 0x4caf7507, 0xbbee99dd, 0xfda37f60, 0x9ff70126, 0xbc5c72f5, 0xc544663b, 0x345bfb7e, 0x768b4329, 0xdccb23c6, 0x68b6edfc, 0x63b8e4f1, 0xcad731dc, 0x10426385, 0x40139722, 0x2084c611, 0x7d854a24, 0xf8d2bb3d, 0x11aef932, 0x6dc729a1, 0x4b1d9e2f, 0xf3dcb230, 0xec0d8652, 0xd077c1e3, 0x6c2bb316, 0x99a970b9, 0xfa119448, 0x2247e964, 0xc4a8fc8c, 0x1aa0f03f, 0xd8567d2c, 0xef223390, 0xc787494e, 0xc1d938d1, 0xfe8ccaa2, 0x3698d40b, 0xcfa6f581, 0x28a57ade, 0x26dab78e, 0xa43fadbf, 0xe42c3a9d, 0x0d507892, 0x9b6a5fcc, 0x62547e46, 0xc2f68d13, 0xe890d8b8, 0x5e2e39f7, 0xf582c3af, 0xbe9f5d80, 0x7c69d093, 0xa96fd52d, 0xb3cf2512, 0x3bc8ac99, 0xa710187d, 0x6ee89c63, 0x7bdb3bbb, 0x09cd2678, 0xf46e5918, 0x01ec9ab7, 0xa8834f9a, 0x65e6956e, 0x7eaaffe6, 0x0821bccf, 0xe6ef15e8, 0xd9bae79b, 0xce4a6f36, 0xd4ea9f09, 0xd629b07c, 0xaf31a4b2, 0x312a3f23, 0x30c6a594, 0xc035a266, 0x37744ebc, 0xa6fc82ca, 0xb0e090d0, 0x1533a7d8, 0x4af10498, 0xf741ecda, 0x0e7fcd50, 0x2f1791f6, 0x8d764dd6, 0x4d43efb0, 0x54ccaa4d, 0xdfe49604, 0xe39ed1b5, 0x1b4c6a88, 0xb8c12c1f, 0x7f466551, 0x049d5eea, 0x5d018c35, 0x73fa8774, 0x2efb0b41, 0x5ab3671d, 0x5292dbd2, 0x33e91056, 0x136dd647, 0x8c9ad761, 0x7a37a10c, 0x8e59f814, 0x89eb133c, 0xeecea927, 0x35b761c9, 0xede11ce5, 0x3c7a47b1, 0x599cd2df, 0x3f55f273, 0x791814ce, 0xbf73c737, 0xea53f7cd, 0x5b5ffdaa, 0x14df3d6f, 0x867844db, 0x81caaff3, 0x3eb968c4, 0x2c382434, 0x5fc2a340, 0x72161dc3, 0x0cbce225, 0x8b283c49, 0x41ff0d95, 0x7139a801, 0xde080cb3, 0x9cd8b4e4, 0x906456c1, 0x617bcb84, 0x70d532b6, 0x74486c5c, 0x42d0b857];
+           var T7 = [0xa75051f4, 0x65537e41, 0xa4c31a17, 0x5e963a27, 0x6bcb3bab, 0x45f11f9d, 0x58abacfa, 0x03934be3, 0xfa552030, 0x6df6ad76, 0x769188cc, 0x4c25f502, 0xd7fc4fe5, 0xcbd7c52a, 0x44802635, 0xa38fb562, 0x5a49deb1, 0x1b6725ba, 0x0e9845ea, 0xc0e15dfe, 0x7502c32f, 0xf012814c, 0x97a38d46, 0xf9c66bd3, 0x5fe7038f, 0x9c951592, 0x7aebbf6d, 0x59da9552, 0x832dd4be, 0x21d35874, 0x692949e0, 0xc8448ec9, 0x896a75c2, 0x7978f48e, 0x3e6b9958, 0x71dd27b9, 0x4fb6bee1, 0xad17f088, 0xac66c920, 0x3ab47dce, 0x4a1863df, 0x3182e51a, 0x33609751, 0x7f456253, 0x77e0b164, 0xae84bb6b, 0xa01cfe81, 0x2b94f908, 0x68587048, 0xfd198f45, 0x6c8794de, 0xf8b7527b, 0xd323ab73, 0x02e2724b, 0x8f57e31f, 0xab2a6655, 0x2807b2eb, 0xc2032fb5, 0x7b9a86c5, 0x08a5d337, 0x87f23028, 0xa5b223bf, 0x6aba0203, 0x825ced16, 0x1c2b8acf, 0xb492a779, 0xf2f0f307, 0xe2a14e69, 0xf4cd65da, 0xbed50605, 0x621fd134, 0xfe8ac4a6, 0x539d342e, 0x55a0a2f3, 0xe132058a, 0xeb75a4f6, 0xec390b83, 0xefaa4060, 0x9f065e71, 0x1051bd6e, 0x8af93e21, 0x063d96dd, 0x05aedd3e, 0xbd464de6, 0x8db59154, 0x5d0571c4, 0xd46f0406, 0x15ff6050, 0xfb241998, 0xe997d6bd, 0x43cc8940, 0x9e7767d9, 0x42bdb0e8, 0x8b880789, 0x5b38e719, 0xeedb79c8, 0x0a47a17c, 0x0fe97c42, 0x1ec9f884, 0x00000000, 0x86830980, 0xed48322b, 0x70ac1e11, 0x724e6c5a, 0xfffbfd0e, 0x38560f85, 0xd51e3dae, 0x3927362d, 0xd9640a0f, 0xa621685c, 0x54d19b5b, 0x2e3a2436, 0x67b10c0a, 0xe70f9357, 0x96d2b4ee, 0x919e1b9b, 0xc54f80c0, 0x20a261dc, 0x4b695a77, 0x1a161c12, 0xba0ae293, 0x2ae5c0a0, 0xe0433c22, 0x171d121b, 0x0d0b0e09, 0xc7adf28b, 0xa8b92db6, 0xa9c8141e, 0x198557f1, 0x074caf75, 0xddbbee99, 0x60fda37f, 0x269ff701, 0xf5bc5c72, 0x3bc54466, 0x7e345bfb, 0x29768b43, 0xc6dccb23, 0xfc68b6ed, 0xf163b8e4, 0xdccad731, 0x85104263, 0x22401397, 0x112084c6, 0x247d854a, 0x3df8d2bb, 0x3211aef9, 0xa16dc729, 0x2f4b1d9e, 0x30f3dcb2, 0x52ec0d86, 0xe3d077c1, 0x166c2bb3, 0xb999a970, 0x48fa1194, 0x642247e9, 0x8cc4a8fc, 0x3f1aa0f0, 0x2cd8567d, 0x90ef2233, 0x4ec78749, 0xd1c1d938, 0xa2fe8cca, 0x0b3698d4, 0x81cfa6f5, 0xde28a57a, 0x8e26dab7, 0xbfa43fad, 0x9de42c3a, 0x920d5078, 0xcc9b6a5f, 0x4662547e, 0x13c2f68d, 0xb8e890d8, 0xf75e2e39, 0xaff582c3, 0x80be9f5d, 0x937c69d0, 0x2da96fd5, 0x12b3cf25, 0x993bc8ac, 0x7da71018, 0x636ee89c, 0xbb7bdb3b, 0x7809cd26, 0x18f46e59, 0xb701ec9a, 0x9aa8834f, 0x6e65e695, 0xe67eaaff, 0xcf0821bc, 0xe8e6ef15, 0x9bd9bae7, 0x36ce4a6f, 0x09d4ea9f, 0x7cd629b0, 0xb2af31a4, 0x23312a3f, 0x9430c6a5, 0x66c035a2, 0xbc37744e, 0xcaa6fc82, 0xd0b0e090, 0xd81533a7, 0x984af104, 0xdaf741ec, 0x500e7fcd, 0xf62f1791, 0xd68d764d, 0xb04d43ef, 0x4d54ccaa, 0x04dfe496, 0xb5e39ed1, 0x881b4c6a, 0x1fb8c12c, 0x517f4665, 0xea049d5e, 0x355d018c, 0x7473fa87, 0x412efb0b, 0x1d5ab367, 0xd25292db, 0x5633e910, 0x47136dd6, 0x618c9ad7, 0x0c7a37a1, 0x148e59f8, 0x3c89eb13, 0x27eecea9, 0xc935b761, 0xe5ede11c, 0xb13c7a47, 0xdf599cd2, 0x733f55f2, 0xce791814, 0x37bf73c7, 0xcdea53f7, 0xaa5b5ffd, 0x6f14df3d, 0xdb867844, 0xf381caaf, 0xc43eb968, 0x342c3824, 0x405fc2a3, 0xc372161d, 0x250cbce2, 0x498b283c, 0x9541ff0d, 0x017139a8, 0xb3de080c, 0xe49cd8b4, 0xc1906456, 0x84617bcb, 0xb670d532, 0x5c74486c, 0x5742d0b8];
+           var T8 = [0xf4a75051, 0x4165537e, 0x17a4c31a, 0x275e963a, 0xab6bcb3b, 0x9d45f11f, 0xfa58abac, 0xe303934b, 0x30fa5520, 0x766df6ad, 0xcc769188, 0x024c25f5, 0xe5d7fc4f, 0x2acbd7c5, 0x35448026, 0x62a38fb5, 0xb15a49de, 0xba1b6725, 0xea0e9845, 0xfec0e15d, 0x2f7502c3, 0x4cf01281, 0x4697a38d, 0xd3f9c66b, 0x8f5fe703, 0x929c9515, 0x6d7aebbf, 0x5259da95, 0xbe832dd4, 0x7421d358, 0xe0692949, 0xc9c8448e, 0xc2896a75, 0x8e7978f4, 0x583e6b99, 0xb971dd27, 0xe14fb6be, 0x88ad17f0, 0x20ac66c9, 0xce3ab47d, 0xdf4a1863, 0x1a3182e5, 0x51336097, 0x537f4562, 0x6477e0b1, 0x6bae84bb, 0x81a01cfe, 0x082b94f9, 0x48685870, 0x45fd198f, 0xde6c8794, 0x7bf8b752, 0x73d323ab, 0x4b02e272, 0x1f8f57e3, 0x55ab2a66, 0xeb2807b2, 0xb5c2032f, 0xc57b9a86, 0x3708a5d3, 0x2887f230, 0xbfa5b223, 0x036aba02, 0x16825ced, 0xcf1c2b8a, 0x79b492a7, 0x07f2f0f3, 0x69e2a14e, 0xdaf4cd65, 0x05bed506, 0x34621fd1, 0xa6fe8ac4, 0x2e539d34, 0xf355a0a2, 0x8ae13205, 0xf6eb75a4, 0x83ec390b, 0x60efaa40, 0x719f065e, 0x6e1051bd, 0x218af93e, 0xdd063d96, 0x3e05aedd, 0xe6bd464d, 0x548db591, 0xc45d0571, 0x06d46f04, 0x5015ff60, 0x98fb2419, 0xbde997d6, 0x4043cc89, 0xd99e7767, 0xe842bdb0, 0x898b8807, 0x195b38e7, 0xc8eedb79, 0x7c0a47a1, 0x420fe97c, 0x841ec9f8, 0x00000000, 0x80868309, 0x2bed4832, 0x1170ac1e, 0x5a724e6c, 0x0efffbfd, 0x8538560f, 0xaed51e3d, 0x2d392736, 0x0fd9640a, 0x5ca62168, 0x5b54d19b, 0x362e3a24, 0x0a67b10c, 0x57e70f93, 0xee96d2b4, 0x9b919e1b, 0xc0c54f80, 0xdc20a261, 0x774b695a, 0x121a161c, 0x93ba0ae2, 0xa02ae5c0, 0x22e0433c, 0x1b171d12, 0x090d0b0e, 0x8bc7adf2, 0xb6a8b92d, 0x1ea9c814, 0xf1198557, 0x75074caf, 0x99ddbbee, 0x7f60fda3, 0x01269ff7, 0x72f5bc5c, 0x663bc544, 0xfb7e345b, 0x4329768b, 0x23c6dccb, 0xedfc68b6, 0xe4f163b8, 0x31dccad7, 0x63851042, 0x97224013, 0xc6112084, 0x4a247d85, 0xbb3df8d2, 0xf93211ae, 0x29a16dc7, 0x9e2f4b1d, 0xb230f3dc, 0x8652ec0d, 0xc1e3d077, 0xb3166c2b, 0x70b999a9, 0x9448fa11, 0xe9642247, 0xfc8cc4a8, 0xf03f1aa0, 0x7d2cd856, 0x3390ef22, 0x494ec787, 0x38d1c1d9, 0xcaa2fe8c, 0xd40b3698, 0xf581cfa6, 0x7ade28a5, 0xb78e26da, 0xadbfa43f, 0x3a9de42c, 0x78920d50, 0x5fcc9b6a, 0x7e466254, 0x8d13c2f6, 0xd8b8e890, 0x39f75e2e, 0xc3aff582, 0x5d80be9f, 0xd0937c69, 0xd52da96f, 0x2512b3cf, 0xac993bc8, 0x187da710, 0x9c636ee8, 0x3bbb7bdb, 0x267809cd, 0x5918f46e, 0x9ab701ec, 0x4f9aa883, 0x956e65e6, 0xffe67eaa, 0xbccf0821, 0x15e8e6ef, 0xe79bd9ba, 0x6f36ce4a, 0x9f09d4ea, 0xb07cd629, 0xa4b2af31, 0x3f23312a, 0xa59430c6, 0xa266c035, 0x4ebc3774, 0x82caa6fc, 0x90d0b0e0, 0xa7d81533, 0x04984af1, 0xecdaf741, 0xcd500e7f, 0x91f62f17, 0x4dd68d76, 0xefb04d43, 0xaa4d54cc, 0x9604dfe4, 0xd1b5e39e, 0x6a881b4c, 0x2c1fb8c1, 0x65517f46, 0x5eea049d, 0x8c355d01, 0x877473fa, 0x0b412efb, 0x671d5ab3, 0xdbd25292, 0x105633e9, 0xd647136d, 0xd7618c9a, 0xa10c7a37, 0xf8148e59, 0x133c89eb, 0xa927eece, 0x61c935b7, 0x1ce5ede1, 0x47b13c7a, 0xd2df599c, 0xf2733f55, 0x14ce7918, 0xc737bf73, 0xf7cdea53, 0xfdaa5b5f, 0x3d6f14df, 0x44db8678, 0xaff381ca, 0x68c43eb9, 0x24342c38, 0xa3405fc2, 0x1dc37216, 0xe2250cbc, 0x3c498b28, 0x0d9541ff, 0xa8017139, 0x0cb3de08, 0xb4e49cd8, 0x56c19064, 0xcb84617b, 0x32b670d5, 0x6c5c7448, 0xb85742d0]; // Transformations for decryption key expansion
 
-                       var dx = p[0] - startOrigin[0];
-                       var dy = p[1] - startOrigin[1];
-                       _event({
-                           type: 'move',
-                           point: [p[0] + offset[0],  p[1] + offset[1]],
-                           delta: [dx, dy]
-                       });
-                   }
-               }
+           var U1 = [0x00000000, 0x0e090d0b, 0x1c121a16, 0x121b171d, 0x3824342c, 0x362d3927, 0x24362e3a, 0x2a3f2331, 0x70486858, 0x7e416553, 0x6c5a724e, 0x62537f45, 0x486c5c74, 0x4665517f, 0x547e4662, 0x5a774b69, 0xe090d0b0, 0xee99ddbb, 0xfc82caa6, 0xf28bc7ad, 0xd8b4e49c, 0xd6bde997, 0xc4a6fe8a, 0xcaaff381, 0x90d8b8e8, 0x9ed1b5e3, 0x8ccaa2fe, 0x82c3aff5, 0xa8fc8cc4, 0xa6f581cf, 0xb4ee96d2, 0xbae79bd9, 0xdb3bbb7b, 0xd532b670, 0xc729a16d, 0xc920ac66, 0xe31f8f57, 0xed16825c, 0xff0d9541, 0xf104984a, 0xab73d323, 0xa57ade28, 0xb761c935, 0xb968c43e, 0x9357e70f, 0x9d5eea04, 0x8f45fd19, 0x814cf012, 0x3bab6bcb, 0x35a266c0, 0x27b971dd, 0x29b07cd6, 0x038f5fe7, 0x0d8652ec, 0x1f9d45f1, 0x119448fa, 0x4be30393, 0x45ea0e98, 0x57f11985, 0x59f8148e, 0x73c737bf, 0x7dce3ab4, 0x6fd52da9, 0x61dc20a2, 0xad766df6, 0xa37f60fd, 0xb16477e0, 0xbf6d7aeb, 0x955259da, 0x9b5b54d1, 0x894043cc, 0x87494ec7, 0xdd3e05ae, 0xd33708a5, 0xc12c1fb8, 0xcf2512b3, 0xe51a3182, 0xeb133c89, 0xf9082b94, 0xf701269f, 0x4de6bd46, 0x43efb04d, 0x51f4a750, 0x5ffdaa5b, 0x75c2896a, 0x7bcb8461, 0x69d0937c, 0x67d99e77, 0x3daed51e, 0x33a7d815, 0x21bccf08, 0x2fb5c203, 0x058ae132, 0x0b83ec39, 0x1998fb24, 0x1791f62f, 0x764dd68d, 0x7844db86, 0x6a5fcc9b, 0x6456c190, 0x4e69e2a1, 0x4060efaa, 0x527bf8b7, 0x5c72f5bc, 0x0605bed5, 0x080cb3de, 0x1a17a4c3, 0x141ea9c8, 0x3e218af9, 0x302887f2, 0x223390ef, 0x2c3a9de4, 0x96dd063d, 0x98d40b36, 0x8acf1c2b, 0x84c61120, 0xaef93211, 0xa0f03f1a, 0xb2eb2807, 0xbce2250c, 0xe6956e65, 0xe89c636e, 0xfa877473, 0xf48e7978, 0xdeb15a49, 0xd0b85742, 0xc2a3405f, 0xccaa4d54, 0x41ecdaf7, 0x4fe5d7fc, 0x5dfec0e1, 0x53f7cdea, 0x79c8eedb, 0x77c1e3d0, 0x65daf4cd, 0x6bd3f9c6, 0x31a4b2af, 0x3fadbfa4, 0x2db6a8b9, 0x23bfa5b2, 0x09808683, 0x07898b88, 0x15929c95, 0x1b9b919e, 0xa17c0a47, 0xaf75074c, 0xbd6e1051, 0xb3671d5a, 0x99583e6b, 0x97513360, 0x854a247d, 0x8b432976, 0xd134621f, 0xdf3d6f14, 0xcd267809, 0xc32f7502, 0xe9105633, 0xe7195b38, 0xf5024c25, 0xfb0b412e, 0x9ad7618c, 0x94de6c87, 0x86c57b9a, 0x88cc7691, 0xa2f355a0, 0xacfa58ab, 0xbee14fb6, 0xb0e842bd, 0xea9f09d4, 0xe49604df, 0xf68d13c2, 0xf8841ec9, 0xd2bb3df8, 0xdcb230f3, 0xcea927ee, 0xc0a02ae5, 0x7a47b13c, 0x744ebc37, 0x6655ab2a, 0x685ca621, 0x42638510, 0x4c6a881b, 0x5e719f06, 0x5078920d, 0x0a0fd964, 0x0406d46f, 0x161dc372, 0x1814ce79, 0x322bed48, 0x3c22e043, 0x2e39f75e, 0x2030fa55, 0xec9ab701, 0xe293ba0a, 0xf088ad17, 0xfe81a01c, 0xd4be832d, 0xdab78e26, 0xc8ac993b, 0xc6a59430, 0x9cd2df59, 0x92dbd252, 0x80c0c54f, 0x8ec9c844, 0xa4f6eb75, 0xaaffe67e, 0xb8e4f163, 0xb6edfc68, 0x0c0a67b1, 0x02036aba, 0x10187da7, 0x1e1170ac, 0x342e539d, 0x3a275e96, 0x283c498b, 0x26354480, 0x7c420fe9, 0x724b02e2, 0x605015ff, 0x6e5918f4, 0x44663bc5, 0x4a6f36ce, 0x587421d3, 0x567d2cd8, 0x37a10c7a, 0x39a80171, 0x2bb3166c, 0x25ba1b67, 0x0f853856, 0x018c355d, 0x13972240, 0x1d9e2f4b, 0x47e96422, 0x49e06929, 0x5bfb7e34, 0x55f2733f, 0x7fcd500e, 0x71c45d05, 0x63df4a18, 0x6dd64713, 0xd731dcca, 0xd938d1c1, 0xcb23c6dc, 0xc52acbd7, 0xef15e8e6, 0xe11ce5ed, 0xf307f2f0, 0xfd0efffb, 0xa779b492, 0xa970b999, 0xbb6bae84, 0xb562a38f, 0x9f5d80be, 0x91548db5, 0x834f9aa8, 0x8d4697a3];
+           var U2 = [0x00000000, 0x0b0e090d, 0x161c121a, 0x1d121b17, 0x2c382434, 0x27362d39, 0x3a24362e, 0x312a3f23, 0x58704868, 0x537e4165, 0x4e6c5a72, 0x4562537f, 0x74486c5c, 0x7f466551, 0x62547e46, 0x695a774b, 0xb0e090d0, 0xbbee99dd, 0xa6fc82ca, 0xadf28bc7, 0x9cd8b4e4, 0x97d6bde9, 0x8ac4a6fe, 0x81caaff3, 0xe890d8b8, 0xe39ed1b5, 0xfe8ccaa2, 0xf582c3af, 0xc4a8fc8c, 0xcfa6f581, 0xd2b4ee96, 0xd9bae79b, 0x7bdb3bbb, 0x70d532b6, 0x6dc729a1, 0x66c920ac, 0x57e31f8f, 0x5ced1682, 0x41ff0d95, 0x4af10498, 0x23ab73d3, 0x28a57ade, 0x35b761c9, 0x3eb968c4, 0x0f9357e7, 0x049d5eea, 0x198f45fd, 0x12814cf0, 0xcb3bab6b, 0xc035a266, 0xdd27b971, 0xd629b07c, 0xe7038f5f, 0xec0d8652, 0xf11f9d45, 0xfa119448, 0x934be303, 0x9845ea0e, 0x8557f119, 0x8e59f814, 0xbf73c737, 0xb47dce3a, 0xa96fd52d, 0xa261dc20, 0xf6ad766d, 0xfda37f60, 0xe0b16477, 0xebbf6d7a, 0xda955259, 0xd19b5b54, 0xcc894043, 0xc787494e, 0xaedd3e05, 0xa5d33708, 0xb8c12c1f, 0xb3cf2512, 0x82e51a31, 0x89eb133c, 0x94f9082b, 0x9ff70126, 0x464de6bd, 0x4d43efb0, 0x5051f4a7, 0x5b5ffdaa, 0x6a75c289, 0x617bcb84, 0x7c69d093, 0x7767d99e, 0x1e3daed5, 0x1533a7d8, 0x0821bccf, 0x032fb5c2, 0x32058ae1, 0x390b83ec, 0x241998fb, 0x2f1791f6, 0x8d764dd6, 0x867844db, 0x9b6a5fcc, 0x906456c1, 0xa14e69e2, 0xaa4060ef, 0xb7527bf8, 0xbc5c72f5, 0xd50605be, 0xde080cb3, 0xc31a17a4, 0xc8141ea9, 0xf93e218a, 0xf2302887, 0xef223390, 0xe42c3a9d, 0x3d96dd06, 0x3698d40b, 0x2b8acf1c, 0x2084c611, 0x11aef932, 0x1aa0f03f, 0x07b2eb28, 0x0cbce225, 0x65e6956e, 0x6ee89c63, 0x73fa8774, 0x78f48e79, 0x49deb15a, 0x42d0b857, 0x5fc2a340, 0x54ccaa4d, 0xf741ecda, 0xfc4fe5d7, 0xe15dfec0, 0xea53f7cd, 0xdb79c8ee, 0xd077c1e3, 0xcd65daf4, 0xc66bd3f9, 0xaf31a4b2, 0xa43fadbf, 0xb92db6a8, 0xb223bfa5, 0x83098086, 0x8807898b, 0x9515929c, 0x9e1b9b91, 0x47a17c0a, 0x4caf7507, 0x51bd6e10, 0x5ab3671d, 0x6b99583e, 0x60975133, 0x7d854a24, 0x768b4329, 0x1fd13462, 0x14df3d6f, 0x09cd2678, 0x02c32f75, 0x33e91056, 0x38e7195b, 0x25f5024c, 0x2efb0b41, 0x8c9ad761, 0x8794de6c, 0x9a86c57b, 0x9188cc76, 0xa0a2f355, 0xabacfa58, 0xb6bee14f, 0xbdb0e842, 0xd4ea9f09, 0xdfe49604, 0xc2f68d13, 0xc9f8841e, 0xf8d2bb3d, 0xf3dcb230, 0xeecea927, 0xe5c0a02a, 0x3c7a47b1, 0x37744ebc, 0x2a6655ab, 0x21685ca6, 0x10426385, 0x1b4c6a88, 0x065e719f, 0x0d507892, 0x640a0fd9, 0x6f0406d4, 0x72161dc3, 0x791814ce, 0x48322bed, 0x433c22e0, 0x5e2e39f7, 0x552030fa, 0x01ec9ab7, 0x0ae293ba, 0x17f088ad, 0x1cfe81a0, 0x2dd4be83, 0x26dab78e, 0x3bc8ac99, 0x30c6a594, 0x599cd2df, 0x5292dbd2, 0x4f80c0c5, 0x448ec9c8, 0x75a4f6eb, 0x7eaaffe6, 0x63b8e4f1, 0x68b6edfc, 0xb10c0a67, 0xba02036a, 0xa710187d, 0xac1e1170, 0x9d342e53, 0x963a275e, 0x8b283c49, 0x80263544, 0xe97c420f, 0xe2724b02, 0xff605015, 0xf46e5918, 0xc544663b, 0xce4a6f36, 0xd3587421, 0xd8567d2c, 0x7a37a10c, 0x7139a801, 0x6c2bb316, 0x6725ba1b, 0x560f8538, 0x5d018c35, 0x40139722, 0x4b1d9e2f, 0x2247e964, 0x2949e069, 0x345bfb7e, 0x3f55f273, 0x0e7fcd50, 0x0571c45d, 0x1863df4a, 0x136dd647, 0xcad731dc, 0xc1d938d1, 0xdccb23c6, 0xd7c52acb, 0xe6ef15e8, 0xede11ce5, 0xf0f307f2, 0xfbfd0eff, 0x92a779b4, 0x99a970b9, 0x84bb6bae, 0x8fb562a3, 0xbe9f5d80, 0xb591548d, 0xa8834f9a, 0xa38d4697];
+           var U3 = [0x00000000, 0x0d0b0e09, 0x1a161c12, 0x171d121b, 0x342c3824, 0x3927362d, 0x2e3a2436, 0x23312a3f, 0x68587048, 0x65537e41, 0x724e6c5a, 0x7f456253, 0x5c74486c, 0x517f4665, 0x4662547e, 0x4b695a77, 0xd0b0e090, 0xddbbee99, 0xcaa6fc82, 0xc7adf28b, 0xe49cd8b4, 0xe997d6bd, 0xfe8ac4a6, 0xf381caaf, 0xb8e890d8, 0xb5e39ed1, 0xa2fe8cca, 0xaff582c3, 0x8cc4a8fc, 0x81cfa6f5, 0x96d2b4ee, 0x9bd9bae7, 0xbb7bdb3b, 0xb670d532, 0xa16dc729, 0xac66c920, 0x8f57e31f, 0x825ced16, 0x9541ff0d, 0x984af104, 0xd323ab73, 0xde28a57a, 0xc935b761, 0xc43eb968, 0xe70f9357, 0xea049d5e, 0xfd198f45, 0xf012814c, 0x6bcb3bab, 0x66c035a2, 0x71dd27b9, 0x7cd629b0, 0x5fe7038f, 0x52ec0d86, 0x45f11f9d, 0x48fa1194, 0x03934be3, 0x0e9845ea, 0x198557f1, 0x148e59f8, 0x37bf73c7, 0x3ab47dce, 0x2da96fd5, 0x20a261dc, 0x6df6ad76, 0x60fda37f, 0x77e0b164, 0x7aebbf6d, 0x59da9552, 0x54d19b5b, 0x43cc8940, 0x4ec78749, 0x05aedd3e, 0x08a5d337, 0x1fb8c12c, 0x12b3cf25, 0x3182e51a, 0x3c89eb13, 0x2b94f908, 0x269ff701, 0xbd464de6, 0xb04d43ef, 0xa75051f4, 0xaa5b5ffd, 0x896a75c2, 0x84617bcb, 0x937c69d0, 0x9e7767d9, 0xd51e3dae, 0xd81533a7, 0xcf0821bc, 0xc2032fb5, 0xe132058a, 0xec390b83, 0xfb241998, 0xf62f1791, 0xd68d764d, 0xdb867844, 0xcc9b6a5f, 0xc1906456, 0xe2a14e69, 0xefaa4060, 0xf8b7527b, 0xf5bc5c72, 0xbed50605, 0xb3de080c, 0xa4c31a17, 0xa9c8141e, 0x8af93e21, 0x87f23028, 0x90ef2233, 0x9de42c3a, 0x063d96dd, 0x0b3698d4, 0x1c2b8acf, 0x112084c6, 0x3211aef9, 0x3f1aa0f0, 0x2807b2eb, 0x250cbce2, 0x6e65e695, 0x636ee89c, 0x7473fa87, 0x7978f48e, 0x5a49deb1, 0x5742d0b8, 0x405fc2a3, 0x4d54ccaa, 0xdaf741ec, 0xd7fc4fe5, 0xc0e15dfe, 0xcdea53f7, 0xeedb79c8, 0xe3d077c1, 0xf4cd65da, 0xf9c66bd3, 0xb2af31a4, 0xbfa43fad, 0xa8b92db6, 0xa5b223bf, 0x86830980, 0x8b880789, 0x9c951592, 0x919e1b9b, 0x0a47a17c, 0x074caf75, 0x1051bd6e, 0x1d5ab367, 0x3e6b9958, 0x33609751, 0x247d854a, 0x29768b43, 0x621fd134, 0x6f14df3d, 0x7809cd26, 0x7502c32f, 0x5633e910, 0x5b38e719, 0x4c25f502, 0x412efb0b, 0x618c9ad7, 0x6c8794de, 0x7b9a86c5, 0x769188cc, 0x55a0a2f3, 0x58abacfa, 0x4fb6bee1, 0x42bdb0e8, 0x09d4ea9f, 0x04dfe496, 0x13c2f68d, 0x1ec9f884, 0x3df8d2bb, 0x30f3dcb2, 0x27eecea9, 0x2ae5c0a0, 0xb13c7a47, 0xbc37744e, 0xab2a6655, 0xa621685c, 0x85104263, 0x881b4c6a, 0x9f065e71, 0x920d5078, 0xd9640a0f, 0xd46f0406, 0xc372161d, 0xce791814, 0xed48322b, 0xe0433c22, 0xf75e2e39, 0xfa552030, 0xb701ec9a, 0xba0ae293, 0xad17f088, 0xa01cfe81, 0x832dd4be, 0x8e26dab7, 0x993bc8ac, 0x9430c6a5, 0xdf599cd2, 0xd25292db, 0xc54f80c0, 0xc8448ec9, 0xeb75a4f6, 0xe67eaaff, 0xf163b8e4, 0xfc68b6ed, 0x67b10c0a, 0x6aba0203, 0x7da71018, 0x70ac1e11, 0x539d342e, 0x5e963a27, 0x498b283c, 0x44802635, 0x0fe97c42, 0x02e2724b, 0x15ff6050, 0x18f46e59, 0x3bc54466, 0x36ce4a6f, 0x21d35874, 0x2cd8567d, 0x0c7a37a1, 0x017139a8, 0x166c2bb3, 0x1b6725ba, 0x38560f85, 0x355d018c, 0x22401397, 0x2f4b1d9e, 0x642247e9, 0x692949e0, 0x7e345bfb, 0x733f55f2, 0x500e7fcd, 0x5d0571c4, 0x4a1863df, 0x47136dd6, 0xdccad731, 0xd1c1d938, 0xc6dccb23, 0xcbd7c52a, 0xe8e6ef15, 0xe5ede11c, 0xf2f0f307, 0xfffbfd0e, 0xb492a779, 0xb999a970, 0xae84bb6b, 0xa38fb562, 0x80be9f5d, 0x8db59154, 0x9aa8834f, 0x97a38d46];
+           var U4 = [0x00000000, 0x090d0b0e, 0x121a161c, 0x1b171d12, 0x24342c38, 0x2d392736, 0x362e3a24, 0x3f23312a, 0x48685870, 0x4165537e, 0x5a724e6c, 0x537f4562, 0x6c5c7448, 0x65517f46, 0x7e466254, 0x774b695a, 0x90d0b0e0, 0x99ddbbee, 0x82caa6fc, 0x8bc7adf2, 0xb4e49cd8, 0xbde997d6, 0xa6fe8ac4, 0xaff381ca, 0xd8b8e890, 0xd1b5e39e, 0xcaa2fe8c, 0xc3aff582, 0xfc8cc4a8, 0xf581cfa6, 0xee96d2b4, 0xe79bd9ba, 0x3bbb7bdb, 0x32b670d5, 0x29a16dc7, 0x20ac66c9, 0x1f8f57e3, 0x16825ced, 0x0d9541ff, 0x04984af1, 0x73d323ab, 0x7ade28a5, 0x61c935b7, 0x68c43eb9, 0x57e70f93, 0x5eea049d, 0x45fd198f, 0x4cf01281, 0xab6bcb3b, 0xa266c035, 0xb971dd27, 0xb07cd629, 0x8f5fe703, 0x8652ec0d, 0x9d45f11f, 0x9448fa11, 0xe303934b, 0xea0e9845, 0xf1198557, 0xf8148e59, 0xc737bf73, 0xce3ab47d, 0xd52da96f, 0xdc20a261, 0x766df6ad, 0x7f60fda3, 0x6477e0b1, 0x6d7aebbf, 0x5259da95, 0x5b54d19b, 0x4043cc89, 0x494ec787, 0x3e05aedd, 0x3708a5d3, 0x2c1fb8c1, 0x2512b3cf, 0x1a3182e5, 0x133c89eb, 0x082b94f9, 0x01269ff7, 0xe6bd464d, 0xefb04d43, 0xf4a75051, 0xfdaa5b5f, 0xc2896a75, 0xcb84617b, 0xd0937c69, 0xd99e7767, 0xaed51e3d, 0xa7d81533, 0xbccf0821, 0xb5c2032f, 0x8ae13205, 0x83ec390b, 0x98fb2419, 0x91f62f17, 0x4dd68d76, 0x44db8678, 0x5fcc9b6a, 0x56c19064, 0x69e2a14e, 0x60efaa40, 0x7bf8b752, 0x72f5bc5c, 0x05bed506, 0x0cb3de08, 0x17a4c31a, 0x1ea9c814, 0x218af93e, 0x2887f230, 0x3390ef22, 0x3a9de42c, 0xdd063d96, 0xd40b3698, 0xcf1c2b8a, 0xc6112084, 0xf93211ae, 0xf03f1aa0, 0xeb2807b2, 0xe2250cbc, 0x956e65e6, 0x9c636ee8, 0x877473fa, 0x8e7978f4, 0xb15a49de, 0xb85742d0, 0xa3405fc2, 0xaa4d54cc, 0xecdaf741, 0xe5d7fc4f, 0xfec0e15d, 0xf7cdea53, 0xc8eedb79, 0xc1e3d077, 0xdaf4cd65, 0xd3f9c66b, 0xa4b2af31, 0xadbfa43f, 0xb6a8b92d, 0xbfa5b223, 0x80868309, 0x898b8807, 0x929c9515, 0x9b919e1b, 0x7c0a47a1, 0x75074caf, 0x6e1051bd, 0x671d5ab3, 0x583e6b99, 0x51336097, 0x4a247d85, 0x4329768b, 0x34621fd1, 0x3d6f14df, 0x267809cd, 0x2f7502c3, 0x105633e9, 0x195b38e7, 0x024c25f5, 0x0b412efb, 0xd7618c9a, 0xde6c8794, 0xc57b9a86, 0xcc769188, 0xf355a0a2, 0xfa58abac, 0xe14fb6be, 0xe842bdb0, 0x9f09d4ea, 0x9604dfe4, 0x8d13c2f6, 0x841ec9f8, 0xbb3df8d2, 0xb230f3dc, 0xa927eece, 0xa02ae5c0, 0x47b13c7a, 0x4ebc3774, 0x55ab2a66, 0x5ca62168, 0x63851042, 0x6a881b4c, 0x719f065e, 0x78920d50, 0x0fd9640a, 0x06d46f04, 0x1dc37216, 0x14ce7918, 0x2bed4832, 0x22e0433c, 0x39f75e2e, 0x30fa5520, 0x9ab701ec, 0x93ba0ae2, 0x88ad17f0, 0x81a01cfe, 0xbe832dd4, 0xb78e26da, 0xac993bc8, 0xa59430c6, 0xd2df599c, 0xdbd25292, 0xc0c54f80, 0xc9c8448e, 0xf6eb75a4, 0xffe67eaa, 0xe4f163b8, 0xedfc68b6, 0x0a67b10c, 0x036aba02, 0x187da710, 0x1170ac1e, 0x2e539d34, 0x275e963a, 0x3c498b28, 0x35448026, 0x420fe97c, 0x4b02e272, 0x5015ff60, 0x5918f46e, 0x663bc544, 0x6f36ce4a, 0x7421d358, 0x7d2cd856, 0xa10c7a37, 0xa8017139, 0xb3166c2b, 0xba1b6725, 0x8538560f, 0x8c355d01, 0x97224013, 0x9e2f4b1d, 0xe9642247, 0xe0692949, 0xfb7e345b, 0xf2733f55, 0xcd500e7f, 0xc45d0571, 0xdf4a1863, 0xd647136d, 0x31dccad7, 0x38d1c1d9, 0x23c6dccb, 0x2acbd7c5, 0x15e8e6ef, 0x1ce5ede1, 0x07f2f0f3, 0x0efffbfd, 0x79b492a7, 0x70b999a9, 0x6bae84bb, 0x62a38fb5, 0x5d80be9f, 0x548db591, 0x4f9aa883, 0x4697a38d];
 
+           function convertToInt32(bytes) {
+             var result = [];
 
-               function pointerup() {
-                   if (_pointerId !== (event.pointerId || 'mouse')) return;
+             for (var i = 0; i < bytes.length; i += 4) {
+               result.push(bytes[i] << 24 | bytes[i + 1] << 16 | bytes[i + 2] << 8 | bytes[i + 3]);
+             }
 
-                   _pointerId = null;
+             return result;
+           }
 
-                   if (started) {
-                       _event({ type: 'end' });
+           var AES = function AES(key) {
+             if (!(this instanceof AES)) {
+               throw Error('AES must be instanitated with `new`');
+             }
 
-                       event.preventDefault();
-                   }
+             Object.defineProperty(this, 'key', {
+               value: coerceArray(key, true)
+             });
 
-                   select(window)
-                       .on(_pointerPrefix + 'move.drag', null)
-                       .on(_pointerPrefix + 'up.drag pointercancel.drag', null);
+             this._prepare();
+           };
 
-                   selectEnable();
-               }
-           }
+           AES.prototype._prepare = function () {
+             var rounds = numberOfRounds[this.key.length];
 
+             if (rounds == null) {
+               throw new Error('invalid key size (must be 16, 24 or 32 bytes)');
+             } // encryption round keys
 
-           function behavior(selection) {
-               _pointerId = null;
-               var matchesSelector = utilPrefixDOMProperty('matchesSelector');
-               var delegate = pointerdown;
 
-               if (_selector) {
-                   delegate = function() {
-                       var root = this;
-                       var target = event.target;
-                       for (; target && target !== root; target = target.parentNode) {
-                           var datum = target.__data__;
+             this._Ke = []; // decryption round keys
 
-                           var entity = datum instanceof osmNote ? datum
-                               : datum && datum.properties && datum.properties.entity;
+             this._Kd = [];
 
-                           if (entity && target[matchesSelector](_selector)) {
-                               return pointerdown.call(target, entity);
-                           }
-                       }
-                   };
-               }
+             for (var i = 0; i <= rounds; i++) {
+               this._Ke.push([0, 0, 0, 0]);
 
-               selection
-                   .on(_pointerPrefix + 'down.drag' + _selector, delegate);
-           }
+               this._Kd.push([0, 0, 0, 0]);
+             }
 
+             var roundKeyCount = (rounds + 1) * 4;
+             var KC = this.key.length / 4; // convert the key into ints
 
-           behavior.off = function(selection) {
-               selection
-                   .on(_pointerPrefix + 'down.drag' + _selector, null);
-           };
+             var tk = convertToInt32(this.key); // copy values into round key arrays
 
+             var index;
 
-           behavior.selector = function(_) {
-               if (!arguments.length) return _selector;
-               _selector = _;
-               return behavior;
-           };
+             for (var i = 0; i < KC; i++) {
+               index = i >> 2;
+               this._Ke[index][i % 4] = tk[i];
+               this._Kd[rounds - index][i % 4] = tk[i];
+             } // key expansion (fips-197 section 5.2)
 
 
-           behavior.origin = function(_) {
-               if (!arguments.length) return _origin;
-               _origin = _;
-               return behavior;
-           };
+             var rconpointer = 0;
+             var t = KC,
+                 tt;
 
+             while (t < roundKeyCount) {
+               tt = tk[KC - 1];
+               tk[0] ^= S[tt >> 16 & 0xFF] << 24 ^ S[tt >> 8 & 0xFF] << 16 ^ S[tt & 0xFF] << 8 ^ S[tt >> 24 & 0xFF] ^ rcon[rconpointer] << 24;
+               rconpointer += 1; // key expansion (for non-256 bit)
 
-           behavior.cancel = function() {
-               select(window)
-                   .on(_pointerPrefix + 'move.drag', null)
-                   .on(_pointerPrefix + 'up.drag pointercancel.drag', null);
-               return behavior;
-           };
+               if (KC != 8) {
+                 for (var i = 1; i < KC; i++) {
+                   tk[i] ^= tk[i - 1];
+                 } // key expansion for 256-bit keys is "slightly different" (fips-197)
 
+               } else {
+                 for (var i = 1; i < KC / 2; i++) {
+                   tk[i] ^= tk[i - 1];
+                 }
 
-           behavior.target = function() {
-               if (!arguments.length) return _target;
-               _target = arguments[0];
-               _event = eventOf(_target, Array.prototype.slice.call(arguments, 1));
-               return behavior;
-           };
+                 tt = tk[KC / 2 - 1];
+                 tk[KC / 2] ^= S[tt & 0xFF] ^ S[tt >> 8 & 0xFF] << 8 ^ S[tt >> 16 & 0xFF] << 16 ^ S[tt >> 24 & 0xFF] << 24;
 
+                 for (var i = KC / 2 + 1; i < KC; i++) {
+                   tk[i] ^= tk[i - 1];
+                 }
+               } // copy values into round key arrays
 
-           behavior.surface = function() {
-               if (!arguments.length) return _surface;
-               _surface = arguments[0];
-               return behavior;
-           };
 
+               var i = 0,
+                   r,
+                   c;
 
-           return utilRebind(behavior, dispatch$1, 'on');
-       }
+               while (i < KC && t < roundKeyCount) {
+                 r = t >> 2;
+                 c = t % 4;
+                 this._Ke[r][c] = tk[i];
+                 this._Kd[rounds - r][c] = tk[i++];
+                 t++;
+               }
+             } // inverse-cipher-ify the decryption round key (fips-197 section 5.3)
 
-       function modeDragNode(context) {
-           var mode = {
-               id: 'drag-node',
-               button: 'browse'
+
+             for (var r = 1; r < rounds; r++) {
+               for (var c = 0; c < 4; c++) {
+                 tt = this._Kd[r][c];
+                 this._Kd[r][c] = U1[tt >> 24 & 0xFF] ^ U2[tt >> 16 & 0xFF] ^ U3[tt >> 8 & 0xFF] ^ U4[tt & 0xFF];
+               }
+             }
            };
-           var hover = behaviorHover(context).altDisables(true)
-               .on('hover', context.ui().sidebar.hover);
-           var edit = behaviorEdit(context);
 
-           var _nudgeInterval;
-           var _restoreSelectedIDs = [];
-           var _wasMidpoint = false;
-           var _isCancelled = false;
-           var _activeEntity;
-           var _startLoc;
-           var _lastLoc;
+           AES.prototype.encrypt = function (plaintext) {
+             if (plaintext.length != 16) {
+               throw new Error('invalid plaintext size (must be 16 bytes)');
+             }
 
+             var rounds = this._Ke.length - 1;
+             var a = [0, 0, 0, 0]; // convert plaintext to (ints ^ key)
 
-           function startNudge(entity, nudge) {
-               if (_nudgeInterval) window.clearInterval(_nudgeInterval);
-               _nudgeInterval = window.setInterval(function() {
-                   context.map().pan(nudge);
-                   doMove(entity, nudge);
-               }, 50);
-           }
+             var t = convertToInt32(plaintext);
 
+             for (var i = 0; i < 4; i++) {
+               t[i] ^= this._Ke[0][i];
+             } // apply round transforms
 
-           function stopNudge() {
-               if (_nudgeInterval) {
-                   window.clearInterval(_nudgeInterval);
-                   _nudgeInterval = null;
+
+             for (var r = 1; r < rounds; r++) {
+               for (var i = 0; i < 4; i++) {
+                 a[i] = T1[t[i] >> 24 & 0xff] ^ T2[t[(i + 1) % 4] >> 16 & 0xff] ^ T3[t[(i + 2) % 4] >> 8 & 0xff] ^ T4[t[(i + 3) % 4] & 0xff] ^ this._Ke[r][i];
                }
-           }
 
+               t = a.slice();
+             } // the last round is special
 
-           function moveAnnotation(entity) {
-               return _t('operations.move.annotation.' + entity.geometry(context.graph()));
-           }
 
+             var result = createArray(16),
+                 tt;
 
-           function connectAnnotation(nodeEntity, targetEntity) {
-               var nodeGeometry = nodeEntity.geometry(context.graph());
-               var targetGeometry = targetEntity.geometry(context.graph());
-               if (nodeGeometry === 'vertex' && targetGeometry === 'vertex') {
-                   var nodeParentWayIDs = context.graph().parentWays(nodeEntity);
-                   var targetParentWayIDs = context.graph().parentWays(targetEntity);
-                   var sharedParentWays = utilArrayIntersection(nodeParentWayIDs, targetParentWayIDs);
-                   // if both vertices are part of the same way
-                   if (sharedParentWays.length !== 0) {
-                       // if the nodes are next to each other, they are merged
-                       if (sharedParentWays[0].areAdjacent(nodeEntity.id, targetEntity.id)) {
-                           return _t('operations.connect.annotation.from_vertex.to_adjacent_vertex');
-                       }
-                       return _t('operations.connect.annotation.from_vertex.to_sibling_vertex');
-                   }
-               }
-               return _t('operations.connect.annotation.from_' + nodeGeometry + '.to_' + targetGeometry);
-           }
+             for (var i = 0; i < 4; i++) {
+               tt = this._Ke[rounds][i];
+               result[4 * i] = (S[t[i] >> 24 & 0xff] ^ tt >> 24) & 0xff;
+               result[4 * i + 1] = (S[t[(i + 1) % 4] >> 16 & 0xff] ^ tt >> 16) & 0xff;
+               result[4 * i + 2] = (S[t[(i + 2) % 4] >> 8 & 0xff] ^ tt >> 8) & 0xff;
+               result[4 * i + 3] = (S[t[(i + 3) % 4] & 0xff] ^ tt) & 0xff;
+             }
+
+             return result;
+           };
 
+           AES.prototype.decrypt = function (ciphertext) {
+             if (ciphertext.length != 16) {
+               throw new Error('invalid ciphertext size (must be 16 bytes)');
+             }
 
-           function shouldSnapToNode(target) {
-               if (!_activeEntity) return false;
-               return _activeEntity.geometry(context.graph()) !== 'vertex' ||
-                   (target.geometry(context.graph()) === 'vertex' || _mainPresetIndex.allowsVertex(target, context.graph()));
-           }
+             var rounds = this._Kd.length - 1;
+             var a = [0, 0, 0, 0]; // convert plaintext to (ints ^ key)
 
+             var t = convertToInt32(ciphertext);
 
-           function origin(entity) {
-               return context.projection(entity.loc);
-           }
+             for (var i = 0; i < 4; i++) {
+               t[i] ^= this._Kd[0][i];
+             } // apply round transforms
 
 
-           function keydown() {
-               if (event.keyCode === utilKeybinding.modifierCodes.alt) {
-                   if (context.surface().classed('nope')) {
-                       context.surface()
-                           .classed('nope-suppressed', true);
-                   }
-                   context.surface()
-                       .classed('nope', false)
-                       .classed('nope-disabled', true);
+             for (var r = 1; r < rounds; r++) {
+               for (var i = 0; i < 4; i++) {
+                 a[i] = T5[t[i] >> 24 & 0xff] ^ T6[t[(i + 3) % 4] >> 16 & 0xff] ^ T7[t[(i + 2) % 4] >> 8 & 0xff] ^ T8[t[(i + 1) % 4] & 0xff] ^ this._Kd[r][i];
                }
-           }
 
+               t = a.slice();
+             } // the last round is special
 
-           function keyup() {
-               if (event.keyCode === utilKeybinding.modifierCodes.alt) {
-                   if (context.surface().classed('nope-suppressed')) {
-                       context.surface()
-                           .classed('nope', true);
-                   }
-                   context.surface()
-                       .classed('nope-suppressed', false)
-                       .classed('nope-disabled', false);
-               }
-           }
 
+             var result = createArray(16),
+                 tt;
 
-           function start(entity) {
-               _wasMidpoint = entity.type === 'midpoint';
-               var hasHidden = context.features().hasHiddenConnections(entity, context.graph());
-               _isCancelled = !context.editable() || event.sourceEvent.shiftKey || hasHidden;
+             for (var i = 0; i < 4; i++) {
+               tt = this._Kd[rounds][i];
+               result[4 * i] = (Si[t[i] >> 24 & 0xff] ^ tt >> 24) & 0xff;
+               result[4 * i + 1] = (Si[t[(i + 3) % 4] >> 16 & 0xff] ^ tt >> 16) & 0xff;
+               result[4 * i + 2] = (Si[t[(i + 2) % 4] >> 8 & 0xff] ^ tt >> 8) & 0xff;
+               result[4 * i + 3] = (Si[t[(i + 1) % 4] & 0xff] ^ tt) & 0xff;
+             }
 
+             return result;
+           };
+           /**
+            *  Mode Of Operation - Electonic Codebook (ECB)
+            */
 
-               if (_isCancelled) {
-                   if (hasHidden) {
-                       context.ui().flash
-                           .duration(4000)
-                           .text(_t('modes.drag_node.connected_to_hidden'))();
-                   }
-                   return drag.cancel();
-               }
 
-               if (_wasMidpoint) {
-                   var midpoint = entity;
-                   entity = osmNode();
-                   context.perform(actionAddMidpoint(midpoint, entity));
-                   entity = context.entity(entity.id);   // get post-action entity
+           var ModeOfOperationECB = function ModeOfOperationECB(key) {
+             if (!(this instanceof ModeOfOperationECB)) {
+               throw Error('AES must be instanitated with `new`');
+             }
 
-                   var vertex = context.surface().selectAll('.' + entity.id);
-                   drag.target(vertex.node(), entity);
+             this.description = "Electronic Code Block";
+             this.name = "ecb";
+             this._aes = new AES(key);
+           };
 
-               } else {
-                   context.perform(actionNoop());
-               }
+           ModeOfOperationECB.prototype.encrypt = function (plaintext) {
+             plaintext = coerceArray(plaintext);
 
-               _activeEntity = entity;
-               _startLoc = entity.loc;
+             if (plaintext.length % 16 !== 0) {
+               throw new Error('invalid plaintext size (must be multiple of 16 bytes)');
+             }
 
-               hover.ignoreVertex(entity.geometry(context.graph()) === 'vertex');
+             var ciphertext = createArray(plaintext.length);
+             var block = createArray(16);
 
-               context.surface().selectAll('.' + _activeEntity.id)
-                   .classed('active', true);
+             for (var i = 0; i < plaintext.length; i += 16) {
+               copyArray(plaintext, block, 0, i, i + 16);
+               block = this._aes.encrypt(block);
+               copyArray(block, ciphertext, i);
+             }
 
-               context.enter(mode);
-           }
+             return ciphertext;
+           };
 
+           ModeOfOperationECB.prototype.decrypt = function (ciphertext) {
+             ciphertext = coerceArray(ciphertext);
 
-           // related code
-           // - `behavior/draw.js` `datum()`
-           function datum() {
-               var event$1 = event && event.sourceEvent;
-               if (!event$1 || event$1.altKey) {
-                   return {};
-               } else {
-                   // When dragging, snap only to touch targets..
-                   // (this excludes area fills and active drawing elements)
-                   var d = event$1.target.__data__;
-                   return (d && d.properties && d.properties.target) ? d : {};
-               }
-           }
+             if (ciphertext.length % 16 !== 0) {
+               throw new Error('invalid ciphertext size (must be multiple of 16 bytes)');
+             }
 
+             var plaintext = createArray(ciphertext.length);
+             var block = createArray(16);
+
+             for (var i = 0; i < ciphertext.length; i += 16) {
+               copyArray(ciphertext, block, 0, i, i + 16);
+               block = this._aes.decrypt(block);
+               copyArray(block, plaintext, i);
+             }
 
-           function doMove(entity, nudge) {
-               nudge = nudge || [0, 0];
+             return plaintext;
+           };
+           /**
+            *  Mode Of Operation - Cipher Block Chaining (CBC)
+            */
 
-               var currPoint = (event && event.point) || context.projection(_lastLoc);
-               var currMouse = geoVecSubtract(currPoint, nudge);
-               var loc = context.projection.invert(currMouse);
 
-               if (!_nudgeInterval) {   // If not nudging at the edge of the viewport, try to snap..
-                   // related code
-                   // - `mode/drag_node.js`     `doMove()`
-                   // - `behavior/draw.js`      `click()`
-                   // - `behavior/draw_way.js`  `move()`
-                   var d = datum();
-                   var target = d && d.properties && d.properties.entity;
-                   var targetLoc = target && target.loc;
-                   var targetNodes = d && d.properties && d.properties.nodes;
-                   var edge;
+           var ModeOfOperationCBC = function ModeOfOperationCBC(key, iv) {
+             if (!(this instanceof ModeOfOperationCBC)) {
+               throw Error('AES must be instanitated with `new`');
+             }
 
-                   if (targetLoc) {   // snap to node/vertex - a point target with `.loc`
-                       if (shouldSnapToNode(target)) {
-                           loc = targetLoc;
-                       }
+             this.description = "Cipher Block Chaining";
+             this.name = "cbc";
 
-                   } else if (targetNodes) {   // snap to way - a line target with `.nodes`
-                       edge = geoChooseEdge(targetNodes, context.map().mouse(), context.projection, end.id);
-                       if (edge) {
-                           loc = edge.loc;
-                       }
-                   }
-               }
+             if (!iv) {
+               iv = createArray(16);
+             } else if (iv.length != 16) {
+               throw new Error('invalid initialation vector size (must be 16 bytes)');
+             }
 
-               context.replace(
-                   actionMoveNode(entity.id, loc)
-               );
+             this._lastCipherblock = coerceArray(iv, true);
+             this._aes = new AES(key);
+           };
 
-               // Below here: validations
-               var isInvalid = false;
+           ModeOfOperationCBC.prototype.encrypt = function (plaintext) {
+             plaintext = coerceArray(plaintext);
 
-               // Check if this connection to `target` could cause relations to break..
-               if (target) {
-                   isInvalid = hasRelationConflict(entity, target, edge, context.graph());
-               }
+             if (plaintext.length % 16 !== 0) {
+               throw new Error('invalid plaintext size (must be multiple of 16 bytes)');
+             }
 
-               // Check if this drag causes the geometry to break..
-               if (!isInvalid) {
-                   isInvalid = hasInvalidGeometry(entity, context.graph());
-               }
+             var ciphertext = createArray(plaintext.length);
+             var block = createArray(16);
 
+             for (var i = 0; i < plaintext.length; i += 16) {
+               copyArray(plaintext, block, 0, i, i + 16);
 
-               var nope = context.surface().classed('nope');
-               if (isInvalid === 'relation' || isInvalid === 'restriction') {
-                   if (!nope) {   // about to nope - show hint
-                       context.ui().flash
-                           .duration(4000)
-                           .text(_t('operations.connect.' + isInvalid,
-                               { relation: _mainPresetIndex.item('type/restriction').name() }
-                           ))();
-                   }
-               } else if (isInvalid) {
-                   var errorID = isInvalid === 'line' ? 'lines' : 'areas';
-                   context.ui().flash
-                       .duration(3000)
-                       .text(_t('self_intersection.error.' + errorID))();
-               } else {
-                   if (nope) {   // about to un-nope, remove hint
-                       context.ui().flash
-                           .duration(1)
-                           .text('')();
-                   }
+               for (var j = 0; j < 16; j++) {
+                 block[j] ^= this._lastCipherblock[j];
                }
 
+               this._lastCipherblock = this._aes.encrypt(block);
+               copyArray(this._lastCipherblock, ciphertext, i);
+             }
 
-               var nopeDisabled = context.surface().classed('nope-disabled');
-               if (nopeDisabled) {
-                   context.surface()
-                       .classed('nope', false)
-                       .classed('nope-suppressed', isInvalid);
-               } else {
-                   context.surface()
-                       .classed('nope', isInvalid)
-                       .classed('nope-suppressed', false);
-               }
+             return ciphertext;
+           };
 
-               _lastLoc = loc;
-           }
+           ModeOfOperationCBC.prototype.decrypt = function (ciphertext) {
+             ciphertext = coerceArray(ciphertext);
 
+             if (ciphertext.length % 16 !== 0) {
+               throw new Error('invalid ciphertext size (must be multiple of 16 bytes)');
+             }
 
-           // Uses `actionConnect.disabled()` to know whether this connection is ok..
-           function hasRelationConflict(entity, target, edge, graph) {
-               var testGraph = graph.update();  // copy
+             var plaintext = createArray(ciphertext.length);
+             var block = createArray(16);
 
-               // if snapping to way - add midpoint there and consider that the target..
-               if (edge) {
-                   var midpoint = osmNode();
-                   var action = actionAddMidpoint({
-                       loc: edge.loc,
-                       edge: [target.nodes[edge.index - 1], target.nodes[edge.index]]
-                   }, midpoint);
+             for (var i = 0; i < ciphertext.length; i += 16) {
+               copyArray(ciphertext, block, 0, i, i + 16);
+               block = this._aes.decrypt(block);
 
-                   testGraph = action(testGraph);
-                   target = midpoint;
+               for (var j = 0; j < 16; j++) {
+                 plaintext[i + j] = block[j] ^ this._lastCipherblock[j];
                }
 
-               // can we connect to it?
-               var ids = [entity.id, target.id];
-               return actionConnect(ids).disabled(testGraph);
-           }
+               copyArray(ciphertext, this._lastCipherblock, 0, i, i + 16);
+             }
 
+             return plaintext;
+           };
+           /**
+            *  Mode Of Operation - Cipher Feedback (CFB)
+            */
 
-           function hasInvalidGeometry(entity, graph) {
-               var parents = graph.parentWays(entity);
-               var i, j, k;
 
-               for (i = 0; i < parents.length; i++) {
-                   var parent = parents[i];
-                   var nodes = [];
-                   var activeIndex = null;    // which multipolygon ring contains node being dragged
-
-                   // test any parent multipolygons for valid geometry
-                   var relations = graph.parentRelations(parent);
-                   for (j = 0; j < relations.length; j++) {
-                       if (!relations[j].isMultipolygon()) continue;
-
-                       var rings = osmJoinWays(relations[j].members, graph);
-
-                       // find active ring and test it for self intersections
-                       for (k = 0; k < rings.length; k++) {
-                           nodes = rings[k].nodes;
-                           if (nodes.find(function(n) { return n.id === entity.id; })) {
-                               activeIndex = k;
-                               if (geoHasSelfIntersections(nodes, entity.id)) {
-                                   return 'multipolygonMember';
-                               }
-                           }
-                           rings[k].coords = nodes.map(function(n) { return n.loc; });
-                       }
+           var ModeOfOperationCFB = function ModeOfOperationCFB(key, iv, segmentSize) {
+             if (!(this instanceof ModeOfOperationCFB)) {
+               throw Error('AES must be instanitated with `new`');
+             }
 
-                       // test active ring for intersections with other rings in the multipolygon
-                       for (k = 0; k < rings.length; k++) {
-                           if (k === activeIndex) continue;
+             this.description = "Cipher Feedback";
+             this.name = "cfb";
 
-                           // make sure active ring doesnt cross passive rings
-                           if (geoHasLineIntersections(rings[activeIndex].nodes, rings[k].nodes, entity.id)) {
-                               return 'multipolygonRing';
-                           }
-                       }
-                   }
+             if (!iv) {
+               iv = createArray(16);
+             } else if (iv.length != 16) {
+               throw new Error('invalid initialation vector size (must be 16 size)');
+             }
 
+             if (!segmentSize) {
+               segmentSize = 1;
+             }
 
-                   // If we still haven't tested this node's parent way for self-intersections.
-                   // (because it's not a member of a multipolygon), test it now.
-                   if (activeIndex === null) {
-                       nodes = parent.nodes.map(function(nodeID) { return graph.entity(nodeID); });
-                       if (nodes.length && geoHasSelfIntersections(nodes, entity.id)) {
-                           return parent.geometry(graph);
-                       }
-                   }
+             this.segmentSize = segmentSize;
+             this._shiftRegister = coerceArray(iv, true);
+             this._aes = new AES(key);
+           };
 
-               }
+           ModeOfOperationCFB.prototype.encrypt = function (plaintext) {
+             if (plaintext.length % this.segmentSize != 0) {
+               throw new Error('invalid plaintext size (must be segmentSize bytes)');
+             }
 
-               return false;
-           }
+             var encrypted = coerceArray(plaintext, true);
+             var xorSegment;
 
+             for (var i = 0; i < encrypted.length; i += this.segmentSize) {
+               xorSegment = this._aes.encrypt(this._shiftRegister);
 
-           function move(entity) {
-               if (_isCancelled) return;
-               event.sourceEvent.stopPropagation();
+               for (var j = 0; j < this.segmentSize; j++) {
+                 encrypted[i + j] ^= xorSegment[j];
+               } // Shift the register
 
-               context.surface().classed('nope-disabled', event.sourceEvent.altKey);
 
-               _lastLoc = context.projection.invert(event.point);
+               copyArray(this._shiftRegister, this._shiftRegister, 0, this.segmentSize);
+               copyArray(encrypted, this._shiftRegister, 16 - this.segmentSize, i, i + this.segmentSize);
+             }
 
-               doMove(entity);
-               var nudge = geoViewportEdge(event.point, context.map().dimensions());
-               if (nudge) {
-                   startNudge(entity, nudge);
-               } else {
-                   stopNudge();
-               }
-           }
+             return encrypted;
+           };
 
-           function end(entity) {
-               if (_isCancelled) return;
+           ModeOfOperationCFB.prototype.decrypt = function (ciphertext) {
+             if (ciphertext.length % this.segmentSize != 0) {
+               throw new Error('invalid ciphertext size (must be segmentSize bytes)');
+             }
 
-               var wasPoint = entity.geometry(context.graph()) === 'point';
+             var plaintext = coerceArray(ciphertext, true);
+             var xorSegment;
 
-               var d = datum();
-               var nope = (d && d.properties && d.properties.nope) || context.surface().classed('nope');
-               var target = d && d.properties && d.properties.entity;   // entity to snap to
+             for (var i = 0; i < plaintext.length; i += this.segmentSize) {
+               xorSegment = this._aes.encrypt(this._shiftRegister);
 
-               if (nope) {   // bounce back
-                   context.perform(
-                       _actionBounceBack(entity.id, _startLoc)
-                   );
+               for (var j = 0; j < this.segmentSize; j++) {
+                 plaintext[i + j] ^= xorSegment[j];
+               } // Shift the register
 
-               } else if (target && target.type === 'way') {
-                   var choice = geoChooseEdge(context.graph().childNodes(target), context.map().mouse(), context.projection, entity.id);
-                   context.replace(
-                       actionAddMidpoint({
-                           loc: choice.loc,
-                           edge: [target.nodes[choice.index - 1], target.nodes[choice.index]]
-                       }, entity),
-                       connectAnnotation(entity, target)
-                   );
 
-               } else if (target && target.type === 'node' && shouldSnapToNode(target)) {
-                   context.replace(
-                       actionConnect([target.id, entity.id]),
-                       connectAnnotation(entity, target)
-                   );
+               copyArray(this._shiftRegister, this._shiftRegister, 0, this.segmentSize);
+               copyArray(ciphertext, this._shiftRegister, 16 - this.segmentSize, i, i + this.segmentSize);
+             }
 
-               } else if (_wasMidpoint) {
-                   context.replace(
-                       actionNoop(),
-                       _t('operations.add.annotation.vertex')
-                   );
+             return plaintext;
+           };
+           /**
+            *  Mode Of Operation - Output Feedback (OFB)
+            */
 
-               } else {
-                   context.replace(
-                       actionNoop(),
-                       moveAnnotation(entity)
-                   );
-               }
 
-               if (wasPoint) {
-                   context.enter(modeSelect(context, [entity.id]));
+           var ModeOfOperationOFB = function ModeOfOperationOFB(key, iv) {
+             if (!(this instanceof ModeOfOperationOFB)) {
+               throw Error('AES must be instanitated with `new`');
+             }
 
-               } else {
-                   var reselection = _restoreSelectedIDs.filter(function(id) {
-                       return context.graph().hasEntity(id);
-                   });
+             this.description = "Output Feedback";
+             this.name = "ofb";
 
-                   if (reselection.length) {
-                       context.enter(modeSelect(context, reselection));
-                   } else {
-                       context.enter(modeBrowse(context));
-                   }
-               }
-           }
+             if (!iv) {
+               iv = createArray(16);
+             } else if (iv.length != 16) {
+               throw new Error('invalid initialation vector size (must be 16 bytes)');
+             }
 
+             this._lastPrecipher = coerceArray(iv, true);
+             this._lastPrecipherIndex = 16;
+             this._aes = new AES(key);
+           };
 
-           function _actionBounceBack(nodeID, toLoc) {
-               var moveNode = actionMoveNode(nodeID, toLoc);
-               var action = function(graph, t) {
-                   // last time through, pop off the bounceback perform.
-                   // it will then overwrite the initial perform with a moveNode that does nothing
-                   if (t === 1) context.pop();
-                   return moveNode(graph, t);
-               };
-               action.transitionable = true;
-               return action;
-           }
+           ModeOfOperationOFB.prototype.encrypt = function (plaintext) {
+             var encrypted = coerceArray(plaintext, true);
 
+             for (var i = 0; i < encrypted.length; i++) {
+               if (this._lastPrecipherIndex === 16) {
+                 this._lastPrecipher = this._aes.encrypt(this._lastPrecipher);
+                 this._lastPrecipherIndex = 0;
+               }
 
-           function cancel() {
-               drag.cancel();
-               context.enter(modeBrowse(context));
-           }
+               encrypted[i] ^= this._lastPrecipher[this._lastPrecipherIndex++];
+             }
 
+             return encrypted;
+           }; // Decryption is symetric
 
-           var drag = behaviorDrag()
-               .selector('.layer-touch.points .target')
-               .surface(context.container().select('.main-map').node())
-               .origin(origin)
-               .on('start', start)
-               .on('move', move)
-               .on('end', end);
 
+           ModeOfOperationOFB.prototype.decrypt = ModeOfOperationOFB.prototype.encrypt;
+           /**
+            *  Counter object for CTR common mode of operation
+            */
 
-           mode.enter = function() {
-               context.install(hover);
-               context.install(edit);
+           var Counter = function Counter(initialValue) {
+             if (!(this instanceof Counter)) {
+               throw Error('Counter must be instanitated with `new`');
+             } // We allow 0, but anything false-ish uses the default 1
 
-               select(window)
-                   .on('keydown.dragNode', keydown)
-                   .on('keyup.dragNode', keyup);
 
-               context.history()
-                   .on('undone.drag-node', cancel);
+             if (initialValue !== 0 && !initialValue) {
+               initialValue = 1;
+             }
+
+             if (typeof initialValue === 'number') {
+               this._counter = createArray(16);
+               this.setValue(initialValue);
+             } else {
+               this.setBytes(initialValue);
+             }
            };
 
+           Counter.prototype.setValue = function (value) {
+             if (typeof value !== 'number' || parseInt(value) != value) {
+               throw new Error('invalid counter value (must be an integer)');
+             } // We cannot safely handle numbers beyond the safe range for integers
 
-           mode.exit = function() {
-               context.ui().sidebar.hover.cancel();
-               context.uninstall(hover);
-               context.uninstall(edit);
 
-               select(window)
-                   .on('keydown.dragNode', null)
-                   .on('keyup.dragNode', null);
+             if (value > Number.MAX_SAFE_INTEGER) {
+               throw new Error('integer value out of safe range');
+             }
 
-               context.history()
-                   .on('undone.drag-node', null);
+             for (var index = 15; index >= 0; --index) {
+               this._counter[index] = value % 256;
+               value = parseInt(value / 256);
+             }
+           };
 
-               _activeEntity = null;
+           Counter.prototype.setBytes = function (bytes) {
+             bytes = coerceArray(bytes, true);
 
-               context.surface()
-                   .classed('nope', false)
-                   .classed('nope-suppressed', false)
-                   .classed('nope-disabled', false)
-                   .selectAll('.active')
-                   .classed('active', false);
+             if (bytes.length != 16) {
+               throw new Error('invalid counter bytes size (must be 16 bytes)');
+             }
 
-               stopNudge();
+             this._counter = bytes;
            };
 
-
-           mode.selectedIDs = function() {
-               if (!arguments.length) return _activeEntity ? [_activeEntity.id] : [];
-               // no assign
-               return mode;
+           Counter.prototype.increment = function () {
+             for (var i = 15; i >= 0; i--) {
+               if (this._counter[i] === 255) {
+                 this._counter[i] = 0;
+               } else {
+                 this._counter[i]++;
+                 break;
+               }
+             }
            };
+           /**
+            *  Mode Of Operation - Counter (CTR)
+            */
 
 
-           mode.activeID = function() {
-               if (!arguments.length) return _activeEntity && _activeEntity.id;
-               // no assign
-               return mode;
-           };
-
+           var ModeOfOperationCTR = function ModeOfOperationCTR(key, counter) {
+             if (!(this instanceof ModeOfOperationCTR)) {
+               throw Error('AES must be instanitated with `new`');
+             }
 
-           mode.restoreSelectedIDs = function(_) {
-               if (!arguments.length) return _restoreSelectedIDs;
-               _restoreSelectedIDs = _;
-               return mode;
-           };
+             this.description = "Counter";
+             this.name = "ctr";
 
+             if (!(counter instanceof Counter)) {
+               counter = new Counter(counter);
+             }
 
-           mode.behavior = drag;
+             this._counter = counter;
+             this._remainingCounter = null;
+             this._remainingCounterIndex = 16;
+             this._aes = new AES(key);
+           };
 
+           ModeOfOperationCTR.prototype.encrypt = function (plaintext) {
+             var encrypted = coerceArray(plaintext, true);
 
-           return mode;
-       }
+             for (var i = 0; i < encrypted.length; i++) {
+               if (this._remainingCounterIndex === 16) {
+                 this._remainingCounter = this._aes.encrypt(this._counter._counter);
+                 this._remainingCounterIndex = 0;
 
-       function quickselect(arr, k, left, right, compare) {
-           quickselectStep(arr, k, left || 0, right || (arr.length - 1), compare || defaultCompare);
-       }
+                 this._counter.increment();
+               }
 
-       function quickselectStep(arr, k, left, right, compare) {
+               encrypted[i] ^= this._remainingCounter[this._remainingCounterIndex++];
+             }
 
-           while (right > left) {
-               if (right - left > 600) {
-                   var n = right - left + 1;
-                   var m = k - left + 1;
-                   var z = Math.log(n);
-                   var s = 0.5 * Math.exp(2 * z / 3);
-                   var sd = 0.5 * Math.sqrt(z * s * (n - s) / n) * (m - n / 2 < 0 ? -1 : 1);
-                   var newLeft = Math.max(left, Math.floor(k - m * s / n + sd));
-                   var newRight = Math.min(right, Math.floor(k + (n - m) * s / n + sd));
-                   quickselectStep(arr, k, newLeft, newRight, compare);
-               }
+             return encrypted;
+           }; // Decryption is symetric
 
-               var t = arr[k];
-               var i = left;
-               var j = right;
 
-               swap(arr, left, k);
-               if (compare(arr[right], t) > 0) swap(arr, left, right);
+           ModeOfOperationCTR.prototype.decrypt = ModeOfOperationCTR.prototype.encrypt; ///////////////////////
+           // Padding
+           // See:https://tools.ietf.org/html/rfc2315
 
-               while (i < j) {
-                   swap(arr, i, j);
-                   i++;
-                   j--;
-                   while (compare(arr[i], t) < 0) i++;
-                   while (compare(arr[j], t) > 0) j--;
-               }
+           function pkcs7pad(data) {
+             data = coerceArray(data, true);
+             var padder = 16 - data.length % 16;
+             var result = createArray(data.length + padder);
+             copyArray(data, result);
 
-               if (compare(arr[left], t) === 0) swap(arr, left, j);
-               else {
-                   j++;
-                   swap(arr, j, right);
-               }
+             for (var i = data.length; i < result.length; i++) {
+               result[i] = padder;
+             }
 
-               if (j <= k) left = j + 1;
-               if (k <= j) right = j - 1;
+             return result;
            }
-       }
 
-       function swap(arr, i, j) {
-           var tmp = arr[i];
-           arr[i] = arr[j];
-           arr[j] = tmp;
-       }
+           function pkcs7strip(data) {
+             data = coerceArray(data, true);
 
-       function defaultCompare(a, b) {
-           return a < b ? -1 : a > b ? 1 : 0;
-       }
+             if (data.length < 16) {
+               throw new Error('PKCS#7 invalid length');
+             }
 
-       class RBush {
-           constructor(maxEntries = 9) {
-               // max entries in a node is 9 by default; min node fill is 40% for best performance
-               this._maxEntries = Math.max(4, maxEntries);
-               this._minEntries = Math.max(2, Math.ceil(this._maxEntries * 0.4));
-               this.clear();
-           }
+             var padder = data[data.length - 1];
 
-           all() {
-               return this._all(this.data, []);
-           }
+             if (padder > 16) {
+               throw new Error('PKCS#7 padding byte out of range');
+             }
 
-           search(bbox) {
-               let node = this.data;
-               const result = [];
+             var length = data.length - padder;
 
-               if (!intersects(bbox, node)) return result;
+             for (var i = 0; i < padder; i++) {
+               if (data[length + i] !== padder) {
+                 throw new Error('PKCS#7 invalid padding byte');
+               }
+             }
 
-               const toBBox = this.toBBox;
-               const nodesToSearch = [];
+             var result = createArray(length);
+             copyArray(data, result, 0, 0, length);
+             return result;
+           } ///////////////////////
+           // Exporting
+           // The block cipher
 
-               while (node) {
-                   for (let i = 0; i < node.children.length; i++) {
-                       const child = node.children[i];
-                       const childBBox = node.leaf ? toBBox(child) : child;
 
-                       if (intersects(bbox, childBBox)) {
-                           if (node.leaf) result.push(child);
-                           else if (contains$1(bbox, childBBox)) this._all(child, result);
-                           else nodesToSearch.push(child);
-                       }
-                   }
-                   node = nodesToSearch.pop();
+           var aesjs = {
+             AES: AES,
+             Counter: Counter,
+             ModeOfOperation: {
+               ecb: ModeOfOperationECB,
+               cbc: ModeOfOperationCBC,
+               cfb: ModeOfOperationCFB,
+               ofb: ModeOfOperationOFB,
+               ctr: ModeOfOperationCTR
+             },
+             utils: {
+               hex: convertHex,
+               utf8: convertUtf8
+             },
+             padding: {
+               pkcs7: {
+                 pad: pkcs7pad,
+                 strip: pkcs7strip
                }
+             },
+             _arrayTest: {
+               coerceArray: coerceArray,
+               createArray: createArray,
+               copyArray: copyArray
+             }
+           }; // node.js
 
-               return result;
+           {
+             module.exports = aesjs; // RequireJS/AMD
+             // http://www.requirejs.org/docs/api.html
+             // https://github.com/amdjs/amdjs-api/wiki/AMD
            }
+         })();
+       });
 
-           collides(bbox) {
-               let node = this.data;
+       // We can use keys that are 128 bits (16 bytes), 192 bits (24 bytes) or 256 bits (32 bytes).
+       // To generate a random key:  window.crypto.getRandomValues(new Uint8Array(16));
+       // This default signing key is built into iD and can be used to mask/unmask sensitive values.
 
-               if (!intersects(bbox, node)) return false;
+       var DEFAULT_128 = [250, 157, 60, 79, 142, 134, 229, 129, 138, 126, 210, 129, 29, 71, 160, 208];
+       function utilAesEncrypt(text, key) {
+         key = key || DEFAULT_128;
+         var textBytes = aesJs.utils.utf8.toBytes(text);
+         var aesCtr = new aesJs.ModeOfOperation.ctr(key);
+         var encryptedBytes = aesCtr.encrypt(textBytes);
+         var encryptedHex = aesJs.utils.hex.fromBytes(encryptedBytes);
+         return encryptedHex;
+       }
+       function utilAesDecrypt(encryptedHex, key) {
+         key = key || DEFAULT_128;
+         var encryptedBytes = aesJs.utils.hex.toBytes(encryptedHex);
+         var aesCtr = new aesJs.ModeOfOperation.ctr(key);
+         var decryptedBytes = aesCtr.decrypt(encryptedBytes);
+         var text = aesJs.utils.utf8.fromBytes(decryptedBytes);
+         return text;
+       }
 
-               const nodesToSearch = [];
-               while (node) {
-                   for (let i = 0; i < node.children.length; i++) {
-                       const child = node.children[i];
-                       const childBBox = node.leaf ? this.toBBox(child) : child;
+       function utilCleanTags(tags) {
+         var out = {};
 
-                       if (intersects(bbox, childBBox)) {
-                           if (node.leaf || contains$1(bbox, childBBox)) return true;
-                           nodesToSearch.push(child);
-                       }
-                   }
-                   node = nodesToSearch.pop();
-               }
+         for (var k in tags) {
+           if (!k) continue;
+           var v = tags[k];
 
-               return false;
+           if (v !== undefined) {
+             out[k] = cleanValue(k, v);
            }
+         }
 
-           load(data) {
-               if (!(data && data.length)) return this;
-
-               if (data.length < this._minEntries) {
-                   for (let i = 0; i < data.length; i++) {
-                       this.insert(data[i]);
-                   }
-                   return this;
-               }
+         return out;
 
-               // recursively build the tree with the given data from scratch using OMT algorithm
-               let node = this._build(data.slice(), 0, data.length - 1, 0);
+         function cleanValue(k, v) {
+           function keepSpaces(k) {
+             return /_hours|_times|:conditional$/.test(k);
+           }
 
-               if (!this.data.children.length) {
-                   // save as is if tree is empty
-                   this.data = node;
+           function skip(k) {
+             return /^(description|note|fixme)$/.test(k);
+           }
 
-               } else if (this.data.height === node.height) {
-                   // split root if trees have the same height
-                   this._splitRoot(this.data, node);
+           if (skip(k)) return v;
+           var cleaned = v.split(';').map(function (s) {
+             return s.trim();
+           }).join(keepSpaces(k) ? '; ' : ';'); // The code below is not intended to validate websites and emails.
+           // It is only intended to prevent obvious copy-paste errors. (#2323)
+           // clean website- and email-like tags
 
-               } else {
-                   if (this.data.height < node.height) {
-                       // swap trees if inserted one is bigger
-                       const tmpNode = this.data;
-                       this.data = node;
-                       node = tmpNode;
-                   }
+           if (k.indexOf('website') !== -1 || k.indexOf('email') !== -1 || cleaned.indexOf('http') === 0) {
+             cleaned = cleaned.replace(/[\u200B-\u200F\uFEFF]/g, ''); // strip LRM and other zero width chars
+           }
 
-                   // insert the small tree into the large tree at appropriate level
-                   this._insert(node, this.data.height - node.height - 1, true);
-               }
+           return cleaned;
+         }
+       }
 
-               return this;
+       // Like selection.property('value', ...), but avoids no-op value sets,
+       // which can result in layout/repaint thrashing in some situations.
+       function utilGetSetValue(selection, value) {
+         function d3_selection_value(value) {
+           function valueNull() {
+             delete this.value;
            }
 
-           insert(item) {
-               if (item) this._insert(item, this.data.height - 1);
-               return this;
+           function valueConstant() {
+             if (this.value !== value) {
+               this.value = value;
+             }
            }
 
-           clear() {
-               this.data = createNode([]);
-               return this;
-           }
+           function valueFunction() {
+             var x = value.apply(this, arguments);
 
-           remove(item, equalsFn) {
-               if (!item) return this;
+             if (x === null || x === undefined) {
+               delete this.value;
+             } else if (this.value !== x) {
+               this.value = x;
+             }
+           }
 
-               let node = this.data;
-               const bbox = this.toBBox(item);
-               const path = [];
-               const indexes = [];
-               let i, parent, goingUp;
+           return value === null || value === undefined ? valueNull : typeof value === 'function' ? valueFunction : valueConstant;
+         }
 
-               // depth-first iterative tree traversal
-               while (node || path.length) {
+         if (arguments.length === 1) {
+           return selection.property('value');
+         }
 
-                   if (!node) { // go up
-                       node = path.pop();
-                       parent = path[path.length - 1];
-                       i = indexes.pop();
-                       goingUp = true;
-                   }
+         return selection.each(d3_selection_value(value));
+       }
 
-                   if (node.leaf) { // check current node
-                       const index = findItem(item, node.children, equalsFn);
+       function utilKeybinding(namespace) {
+         var _keybindings = {};
 
-                       if (index !== -1) {
-                           // item found, remove the item and condense tree upwards
-                           node.children.splice(index, 1);
-                           path.push(node);
-                           this._condense(path);
-                           return this;
-                       }
-                   }
+         function testBindings(d3_event, isCapturing) {
+           var didMatch = false;
+           var bindings = Object.keys(_keybindings).map(function (id) {
+             return _keybindings[id];
+           });
+           var i, binding; // Most key shortcuts will accept either lower or uppercase ('h' or 'H'),
+           // so we don't strictly match on the shift key, but we prioritize
+           // shifted keybindings first, and fallback to unshifted only if no match.
+           // (This lets us differentiate between '←'/'⇧←' or '⌘Z'/'⌘⇧Z')
+           // priority match shifted keybindings first
 
-                   if (!goingUp && !node.leaf && contains$1(node, bbox)) { // go down
-                       path.push(node);
-                       indexes.push(i);
-                       i = 0;
-                       parent = node;
-                       node = node.children[0];
+           for (i = 0; i < bindings.length; i++) {
+             binding = bindings[i];
+             if (!binding.event.modifiers.shiftKey) continue; // no shift
 
-                   } else if (parent) { // go right
-                       i++;
-                       node = parent.children[i];
-                       goingUp = false;
+             if (!!binding.capture !== isCapturing) continue;
 
-                   } else node = null; // nothing found
-               }
+             if (matches(d3_event, binding, true)) {
+               binding.callback(d3_event);
+               didMatch = true; // match a max of one binding per event
 
-               return this;
+               break;
+             }
            }
 
-           toBBox(item) { return item; }
+           if (didMatch) return; // then unshifted keybindings
 
-           compareMinX(a, b) { return a.minX - b.minX; }
-           compareMinY(a, b) { return a.minY - b.minY; }
+           for (i = 0; i < bindings.length; i++) {
+             binding = bindings[i];
+             if (binding.event.modifiers.shiftKey) continue; // shift
 
-           toJSON() { return this.data; }
+             if (!!binding.capture !== isCapturing) continue;
 
-           fromJSON(data) {
-               this.data = data;
-               return this;
+             if (matches(d3_event, binding, false)) {
+               binding.callback(d3_event);
+               break;
+             }
            }
 
-           _all(node, result) {
-               const nodesToSearch = [];
-               while (node) {
-                   if (node.leaf) result.push(...node.children);
-                   else nodesToSearch.push(...node.children);
-
-                   node = nodesToSearch.pop();
-               }
-               return result;
-           }
+           function matches(d3_event, binding, testShift) {
+             var event = d3_event;
+             var isMatch = false;
+             var tryKeyCode = true; // Prefer a match on `KeyboardEvent.key`
 
-           _build(items, left, right, height) {
+             if (event.key !== undefined) {
+               tryKeyCode = event.key.charCodeAt(0) > 255; // outside ISO-Latin-1
 
-               const N = right - left + 1;
-               let M = this._maxEntries;
-               let node;
+               isMatch = true;
 
-               if (N <= M) {
-                   // reached leaf level; return leaf
-                   node = createNode(items.slice(left, right + 1));
-                   calcBBox(node, this.toBBox);
-                   return node;
+               if (binding.event.key === undefined) {
+                 isMatch = false;
+               } else if (Array.isArray(binding.event.key)) {
+                 if (binding.event.key.map(function (s) {
+                   return s.toLowerCase();
+                 }).indexOf(event.key.toLowerCase()) === -1) isMatch = false;
+               } else {
+                 if (event.key.toLowerCase() !== binding.event.key.toLowerCase()) isMatch = false;
                }
+             } // Fallback match on `KeyboardEvent.keyCode`, can happen if:
+             // - browser doesn't support `KeyboardEvent.key`
+             // - `KeyboardEvent.key` is outside ISO-Latin-1 range (cyrillic?)
 
-               if (!height) {
-                   // target height of the bulk-loaded tree
-                   height = Math.ceil(Math.log(N) / Math.log(M));
 
-                   // target number of root entries to maximize storage utilization
-                   M = Math.ceil(N / Math.pow(M, height - 1));
-               }
+             if (!isMatch && tryKeyCode) {
+               isMatch = event.keyCode === binding.event.keyCode;
+             }
 
-               node = createNode([]);
-               node.leaf = false;
-               node.height = height;
+             if (!isMatch) return false; // test modifier keys
 
-               // split the items into M mostly square tiles
+             if (!(event.ctrlKey && event.altKey)) {
+               // if both are set, assume AltGr and skip it - #4096
+               if (event.ctrlKey !== binding.event.modifiers.ctrlKey) return false;
+               if (event.altKey !== binding.event.modifiers.altKey) return false;
+             }
 
-               const N2 = Math.ceil(N / M);
-               const N1 = N2 * Math.ceil(Math.sqrt(M));
+             if (event.metaKey !== binding.event.modifiers.metaKey) return false;
+             if (testShift && event.shiftKey !== binding.event.modifiers.shiftKey) return false;
+             return true;
+           }
+         }
 
-               multiSelect(items, left, right, N1, this.compareMinX);
+         function capture(d3_event) {
+           testBindings(d3_event, true);
+         }
 
-               for (let i = left; i <= right; i += N1) {
+         function bubble(d3_event) {
+           var tagName = select(d3_event.target).node().tagName;
 
-                   const right2 = Math.min(i + N1 - 1, right);
+           if (tagName === 'INPUT' || tagName === 'SELECT' || tagName === 'TEXTAREA') {
+             return;
+           }
 
-                   multiSelect(items, i, right2, N2, this.compareMinY);
+           testBindings(d3_event, false);
+         }
 
-                   for (let j = i; j <= right2; j += N2) {
+         function keybinding(selection) {
+           selection = selection || select(document);
+           selection.on('keydown.capture.' + namespace, capture, true);
+           selection.on('keydown.bubble.' + namespace, bubble, false);
+           return keybinding;
+         } // was: keybinding.off()
 
-                       const right3 = Math.min(j + N2 - 1, right2);
 
-                       // pack each entry recursively
-                       node.children.push(this._build(items, j, right3, height - 1));
-                   }
-               }
+         keybinding.unbind = function (selection) {
+           _keybindings = [];
+           selection = selection || select(document);
+           selection.on('keydown.capture.' + namespace, null);
+           selection.on('keydown.bubble.' + namespace, null);
+           return keybinding;
+         };
 
-               calcBBox(node, this.toBBox);
+         keybinding.clear = function () {
+           _keybindings = {};
+           return keybinding;
+         }; // Remove one or more keycode bindings.
 
-               return node;
-           }
 
-           _chooseSubtree(bbox, node, level, path) {
-               while (true) {
-                   path.push(node);
+         keybinding.off = function (codes, capture) {
+           var arr = utilArrayUniq([].concat(codes));
 
-                   if (node.leaf || path.length - 1 === level) break;
+           for (var i = 0; i < arr.length; i++) {
+             var id = arr[i] + (capture ? '-capture' : '-bubble');
+             delete _keybindings[id];
+           }
 
-                   let minArea = Infinity;
-                   let minEnlargement = Infinity;
-                   let targetNode;
+           return keybinding;
+         }; // Add one or more keycode bindings.
+
+
+         keybinding.on = function (codes, callback, capture) {
+           if (typeof callback !== 'function') {
+             return keybinding.off(codes, capture);
+           }
+
+           var arr = utilArrayUniq([].concat(codes));
+
+           for (var i = 0; i < arr.length; i++) {
+             var id = arr[i] + (capture ? '-capture' : '-bubble');
+             var binding = {
+               id: id,
+               capture: capture,
+               callback: callback,
+               event: {
+                 key: undefined,
+                 // preferred
+                 keyCode: 0,
+                 // fallback
+                 modifiers: {
+                   shiftKey: false,
+                   ctrlKey: false,
+                   altKey: false,
+                   metaKey: false
+                 }
+               }
+             };
 
-                   for (let i = 0; i < node.children.length; i++) {
-                       const child = node.children[i];
-                       const area = bboxArea(child);
-                       const enlargement = enlargedArea(bbox, child) - area;
+             if (_keybindings[id]) {
+               console.warn('warning: duplicate keybinding for "' + id + '"'); // eslint-disable-line no-console
+             }
 
-                       // choose entry with the least area enlargement
-                       if (enlargement < minEnlargement) {
-                           minEnlargement = enlargement;
-                           minArea = area < minArea ? area : minArea;
-                           targetNode = child;
+             _keybindings[id] = binding;
+             var matches = arr[i].toLowerCase().match(/(?:(?:[^+⇧⌃⌥⌘])+|[⇧⌃⌥⌘]|\+\+|^\+$)/g);
 
-                       } else if (enlargement === minEnlargement) {
-                           // otherwise choose one with the smallest area
-                           if (area < minArea) {
-                               minArea = area;
-                               targetNode = child;
-                           }
-                       }
-                   }
+             for (var j = 0; j < matches.length; j++) {
+               // Normalise matching errors
+               if (matches[j] === '++') matches[j] = '+';
 
-                   node = targetNode || node.children[0];
-               }
+               if (matches[j] in utilKeybinding.modifierCodes) {
+                 var prop = utilKeybinding.modifierProperties[utilKeybinding.modifierCodes[matches[j]]];
+                 binding.event.modifiers[prop] = true;
+               } else {
+                 binding.event.key = utilKeybinding.keys[matches[j]] || matches[j];
 
-               return node;
+                 if (matches[j] in utilKeybinding.keyCodes) {
+                   binding.event.keyCode = utilKeybinding.keyCodes[matches[j]];
+                 }
+               }
+             }
            }
 
-           _insert(item, level, isNode) {
-               const bbox = isNode ? item : this.toBBox(item);
-               const insertPath = [];
-
-               // find the best node for accommodating the item, saving all nodes along the path too
-               const node = this._chooseSubtree(bbox, this.data, level, insertPath);
+           return keybinding;
+         };
 
-               // put the item into the node
-               node.children.push(item);
-               extend$1(node, bbox);
+         return keybinding;
+       }
+       /*
+        * See https://github.com/keithamus/jwerty
+        */
 
-               // split on node overflow; propagate upwards if necessary
-               while (level >= 0) {
-                   if (insertPath[level].children.length > this._maxEntries) {
-                       this._split(insertPath, level);
-                       level--;
-                   } else break;
-               }
+       utilKeybinding.modifierCodes = {
+         // Shift key, ⇧
+         '⇧': 16,
+         shift: 16,
+         // CTRL key, on Mac: ⌃
+         '⌃': 17,
+         ctrl: 17,
+         // ALT key, on Mac: ⌥ (Alt)
+         '⌥': 18,
+         alt: 18,
+         option: 18,
+         // META, on Mac: ⌘ (CMD), on Windows (Win), on Linux (Super)
+         '⌘': 91,
+         meta: 91,
+         cmd: 91,
+         'super': 91,
+         win: 91
+       };
+       utilKeybinding.modifierProperties = {
+         16: 'shiftKey',
+         17: 'ctrlKey',
+         18: 'altKey',
+         91: 'metaKey'
+       };
+       utilKeybinding.plusKeys = ['plus', 'ffplus', '=', 'ffequals', '≠', '±'];
+       utilKeybinding.minusKeys = ['_', '-', 'ffminus', 'dash', '–', '—'];
+       utilKeybinding.keys = {
+         // Backspace key, on Mac: ⌫ (Backspace)
+         '⌫': 'Backspace',
+         backspace: 'Backspace',
+         // Tab Key, on Mac: ⇥ (Tab), on Windows ⇥⇥
+         '⇥': 'Tab',
+         '⇆': 'Tab',
+         tab: 'Tab',
+         // Return key, ↩
+         '↩': 'Enter',
+         '↵': 'Enter',
+         '⏎': 'Enter',
+         'return': 'Enter',
+         enter: 'Enter',
+         '⌅': 'Enter',
+         // Pause/Break key
+         'pause': 'Pause',
+         'pause-break': 'Pause',
+         // Caps Lock key, ⇪
+         '⇪': 'CapsLock',
+         caps: 'CapsLock',
+         'caps-lock': 'CapsLock',
+         // Escape key, on Mac: ⎋, on Windows: Esc
+         '⎋': ['Escape', 'Esc'],
+         escape: ['Escape', 'Esc'],
+         esc: ['Escape', 'Esc'],
+         // Space key
+         space: [' ', 'Spacebar'],
+         // Page-Up key, or pgup, on Mac: ↖
+         '↖': 'PageUp',
+         pgup: 'PageUp',
+         'page-up': 'PageUp',
+         // Page-Down key, or pgdown, on Mac: ↘
+         '↘': 'PageDown',
+         pgdown: 'PageDown',
+         'page-down': 'PageDown',
+         // END key, on Mac: ⇟
+         '⇟': 'End',
+         end: 'End',
+         // HOME key, on Mac: ⇞
+         '⇞': 'Home',
+         home: 'Home',
+         // Insert key, or ins
+         ins: 'Insert',
+         insert: 'Insert',
+         // Delete key, on Mac: ⌦ (Delete)
+         '⌦': ['Delete', 'Del'],
+         del: ['Delete', 'Del'],
+         'delete': ['Delete', 'Del'],
+         // Left Arrow Key, or ←
+         '←': ['ArrowLeft', 'Left'],
+         left: ['ArrowLeft', 'Left'],
+         'arrow-left': ['ArrowLeft', 'Left'],
+         // Up Arrow Key, or ↑
+         '↑': ['ArrowUp', 'Up'],
+         up: ['ArrowUp', 'Up'],
+         'arrow-up': ['ArrowUp', 'Up'],
+         // Right Arrow Key, or →
+         '→': ['ArrowRight', 'Right'],
+         right: ['ArrowRight', 'Right'],
+         'arrow-right': ['ArrowRight', 'Right'],
+         // Up Arrow Key, or ↓
+         '↓': ['ArrowDown', 'Down'],
+         down: ['ArrowDown', 'Down'],
+         'arrow-down': ['ArrowDown', 'Down'],
+         // odities, stuff for backward compatibility (browsers and code):
+         // Num-Multiply, or *
+         '*': ['*', 'Multiply'],
+         star: ['*', 'Multiply'],
+         asterisk: ['*', 'Multiply'],
+         multiply: ['*', 'Multiply'],
+         // Num-Plus or +
+         '+': ['+', 'Add'],
+         'plus': ['+', 'Add'],
+         // Num-Subtract, or -
+         '-': ['-', 'Subtract'],
+         subtract: ['-', 'Subtract'],
+         'dash': ['-', 'Subtract'],
+         // Semicolon
+         semicolon: ';',
+         // = or equals
+         equals: '=',
+         // Comma, or ,
+         comma: ',',
+         // Period, or ., or full-stop
+         period: '.',
+         'full-stop': '.',
+         // Slash, or /, or forward-slash
+         slash: '/',
+         'forward-slash': '/',
+         // Tick, or `, or back-quote
+         tick: '`',
+         'back-quote': '`',
+         // Open bracket, or [
+         'open-bracket': '[',
+         // Back slash, or \
+         'back-slash': '\\',
+         // Close backet, or ]
+         'close-bracket': ']',
+         // Apostrophe, or Quote, or '
+         quote: '\'',
+         apostrophe: '\'',
+         // NUMPAD 0-9
+         'num-0': '0',
+         'num-1': '1',
+         'num-2': '2',
+         'num-3': '3',
+         'num-4': '4',
+         'num-5': '5',
+         'num-6': '6',
+         'num-7': '7',
+         'num-8': '8',
+         'num-9': '9',
+         // F1-F25
+         f1: 'F1',
+         f2: 'F2',
+         f3: 'F3',
+         f4: 'F4',
+         f5: 'F5',
+         f6: 'F6',
+         f7: 'F7',
+         f8: 'F8',
+         f9: 'F9',
+         f10: 'F10',
+         f11: 'F11',
+         f12: 'F12',
+         f13: 'F13',
+         f14: 'F14',
+         f15: 'F15',
+         f16: 'F16',
+         f17: 'F17',
+         f18: 'F18',
+         f19: 'F19',
+         f20: 'F20',
+         f21: 'F21',
+         f22: 'F22',
+         f23: 'F23',
+         f24: 'F24',
+         f25: 'F25'
+       };
+       utilKeybinding.keyCodes = {
+         // Backspace key, on Mac: ⌫ (Backspace)
+         '⌫': 8,
+         backspace: 8,
+         // Tab Key, on Mac: ⇥ (Tab), on Windows ⇥⇥
+         '⇥': 9,
+         '⇆': 9,
+         tab: 9,
+         // Return key, ↩
+         '↩': 13,
+         '↵': 13,
+         '⏎': 13,
+         'return': 13,
+         enter: 13,
+         '⌅': 13,
+         // Pause/Break key
+         'pause': 19,
+         'pause-break': 19,
+         // Caps Lock key, ⇪
+         '⇪': 20,
+         caps: 20,
+         'caps-lock': 20,
+         // Escape key, on Mac: ⎋, on Windows: Esc
+         '⎋': 27,
+         escape: 27,
+         esc: 27,
+         // Space key
+         space: 32,
+         // Page-Up key, or pgup, on Mac: ↖
+         '↖': 33,
+         pgup: 33,
+         'page-up': 33,
+         // Page-Down key, or pgdown, on Mac: ↘
+         '↘': 34,
+         pgdown: 34,
+         'page-down': 34,
+         // END key, on Mac: ⇟
+         '⇟': 35,
+         end: 35,
+         // HOME key, on Mac: ⇞
+         '⇞': 36,
+         home: 36,
+         // Insert key, or ins
+         ins: 45,
+         insert: 45,
+         // Delete key, on Mac: ⌦ (Delete)
+         '⌦': 46,
+         del: 46,
+         'delete': 46,
+         // Left Arrow Key, or ←
+         '←': 37,
+         left: 37,
+         'arrow-left': 37,
+         // Up Arrow Key, or ↑
+         '↑': 38,
+         up: 38,
+         'arrow-up': 38,
+         // Right Arrow Key, or →
+         '→': 39,
+         right: 39,
+         'arrow-right': 39,
+         // Up Arrow Key, or ↓
+         '↓': 40,
+         down: 40,
+         'arrow-down': 40,
+         // odities, printing characters that come out wrong:
+         // Firefox Equals
+         'ffequals': 61,
+         // Num-Multiply, or *
+         '*': 106,
+         star: 106,
+         asterisk: 106,
+         multiply: 106,
+         // Num-Plus or +
+         '+': 107,
+         'plus': 107,
+         // Num-Subtract, or -
+         '-': 109,
+         subtract: 109,
+         // Firefox Plus
+         'ffplus': 171,
+         // Firefox Minus
+         'ffminus': 173,
+         // Semicolon
+         ';': 186,
+         semicolon: 186,
+         // = or equals
+         '=': 187,
+         'equals': 187,
+         // Comma, or ,
+         ',': 188,
+         comma: 188,
+         // Dash / Underscore key
+         'dash': 189,
+         // Period, or ., or full-stop
+         '.': 190,
+         period: 190,
+         'full-stop': 190,
+         // Slash, or /, or forward-slash
+         '/': 191,
+         slash: 191,
+         'forward-slash': 191,
+         // Tick, or `, or back-quote
+         '`': 192,
+         tick: 192,
+         'back-quote': 192,
+         // Open bracket, or [
+         '[': 219,
+         'open-bracket': 219,
+         // Back slash, or \
+         '\\': 220,
+         'back-slash': 220,
+         // Close backet, or ]
+         ']': 221,
+         'close-bracket': 221,
+         // Apostrophe, or Quote, or '
+         '\'': 222,
+         quote: 222,
+         apostrophe: 222
+       }; // NUMPAD 0-9
+
+       var i$1 = 95,
+           n = 0;
+
+       while (++i$1 < 106) {
+         utilKeybinding.keyCodes['num-' + n] = i$1;
+         ++n;
+       } // 0-9
+
+
+       i$1 = 47;
+       n = 0;
+
+       while (++i$1 < 58) {
+         utilKeybinding.keyCodes[n] = i$1;
+         ++n;
+       } // F1-F25
+
+
+       i$1 = 111;
+       n = 1;
+
+       while (++i$1 < 136) {
+         utilKeybinding.keyCodes['f' + n] = i$1;
+         ++n;
+       } // a-z
+
+
+       i$1 = 64;
+
+       while (++i$1 < 91) {
+         utilKeybinding.keyCodes[String.fromCharCode(i$1).toLowerCase()] = i$1;
+       }
 
-               // adjust bboxes along the insertion path
-               this._adjustParentBBoxes(bbox, insertPath, level);
+       function utilObjectOmit(obj, omitKeys) {
+         return Object.keys(obj).reduce(function (result, key) {
+           if (omitKeys.indexOf(key) === -1) {
+             result[key] = obj[key]; // keep
            }
 
-           // split overflowed node into two
-           _split(insertPath, level) {
-               const node = insertPath[level];
-               const M = node.children.length;
-               const m = this._minEntries;
+           return result;
+         }, {});
+       }
 
-               this._chooseSplitAxis(node, m, M);
+       // Copies a variable number of methods from source to target.
+       function utilRebind(target, source) {
+         var i = 1,
+             n = arguments.length,
+             method;
 
-               const splitIndex = this._chooseSplitIndex(node, m, M);
+         while (++i < n) {
+           target[method = arguments[i]] = d3_rebind(target, source, source[method]);
+         }
 
-               const newNode = createNode(node.children.splice(splitIndex, node.children.length - splitIndex));
-               newNode.height = node.height;
-               newNode.leaf = node.leaf;
+         return target;
+       } // Method is assumed to be a standard D3 getter-setter:
+       // If passed with no arguments, gets the value.
+       // If passed with arguments, sets the value and returns the target.
 
-               calcBBox(node, this.toBBox);
-               calcBBox(newNode, this.toBBox);
+       function d3_rebind(target, source, method) {
+         return function () {
+           var value = method.apply(source, arguments);
+           return value === source ? target : value;
+         };
+       }
 
-               if (level) insertPath[level - 1].children.push(newNode);
-               else this._splitRoot(node, newNode);
-           }
+       // A per-domain session mutex backed by a cookie and dead man's
+       // switch. If the session crashes, the mutex will auto-release
+       // after 5 seconds.
+       // This accepts a string and returns an object that complies with utilSessionMutexType
+       function utilSessionMutex(name) {
+         var mutex = {};
+         var intervalID;
 
-           _splitRoot(node, newNode) {
-               // split root node
-               this.data = createNode([node, newNode]);
-               this.data.height = node.height + 1;
-               this.data.leaf = false;
-               calcBBox(this.data, this.toBBox);
-           }
+         function renew() {
+           var expires = new Date();
+           expires.setSeconds(expires.getSeconds() + 5);
+           document.cookie = name + '=1; expires=' + expires.toUTCString() + '; sameSite=strict';
+         }
 
-           _chooseSplitIndex(node, m, M) {
-               let index;
-               let minOverlap = Infinity;
-               let minArea = Infinity;
+         mutex.lock = function () {
+           if (intervalID) return true;
+           var cookie = document.cookie.replace(new RegExp('(?:(?:^|.*;)\\s*' + name + '\\s*\\=\\s*([^;]*).*$)|^.*$'), '$1');
+           if (cookie) return false;
+           renew();
+           intervalID = window.setInterval(renew, 4000);
+           return true;
+         };
 
-               for (let i = m; i <= M - m; i++) {
-                   const bbox1 = distBBox(node, 0, i, this.toBBox);
-                   const bbox2 = distBBox(node, i, M, this.toBBox);
+         mutex.unlock = function () {
+           if (!intervalID) return;
+           document.cookie = name + '=; expires=Thu, 01 Jan 1970 00:00:00 GMT; sameSite=strict';
+           clearInterval(intervalID);
+           intervalID = null;
+         };
 
-                   const overlap = intersectionArea(bbox1, bbox2);
-                   const area = bboxArea(bbox1) + bboxArea(bbox2);
+         mutex.locked = function () {
+           return !!intervalID;
+         };
 
-                   // choose distribution with minimum overlap
-                   if (overlap < minOverlap) {
-                       minOverlap = overlap;
-                       index = i;
+         return mutex;
+       }
 
-                       minArea = area < minArea ? area : minArea;
+       function utilTiler() {
+         var _size = [256, 256];
+         var _scale = 256;
+         var _tileSize = 256;
+         var _zoomExtent = [0, 20];
+         var _translate = [_size[0] / 2, _size[1] / 2];
+         var _margin = 0;
+         var _skipNullIsland = false;
+
+         function clamp(num, min, max) {
+           return Math.max(min, Math.min(num, max));
+         }
 
-                   } else if (overlap === minOverlap) {
-                       // otherwise choose distribution with minimum area
-                       if (area < minArea) {
-                           minArea = area;
-                           index = i;
-                       }
-                   }
-               }
+         function nearNullIsland(tile) {
+           var x = tile[0];
+           var y = tile[1];
+           var z = tile[2];
 
-               return index || M - m;
+           if (z >= 7) {
+             var center = Math.pow(2, z - 1);
+             var width = Math.pow(2, z - 6);
+             var min = center - width / 2;
+             var max = center + width / 2 - 1;
+             return x >= min && x <= max && y >= min && y <= max;
            }
 
-           // sorts node children by the best axis for split
-           _chooseSplitAxis(node, m, M) {
-               const compareMinX = node.leaf ? this.compareMinX : compareNodeMinX;
-               const compareMinY = node.leaf ? this.compareMinY : compareNodeMinY;
-               const xMargin = this._allDistMargin(node, m, M, compareMinX);
-               const yMargin = this._allDistMargin(node, m, M, compareMinY);
+           return false;
+         }
 
-               // if total distributions margin value is minimal for x, sort by minX,
-               // otherwise it's already sorted by minY
-               if (xMargin < yMargin) node.children.sort(compareMinX);
-           }
+         function tiler() {
+           var z = geoScaleToZoom(_scale / (2 * Math.PI), _tileSize);
+           var z0 = clamp(Math.round(z), _zoomExtent[0], _zoomExtent[1]);
+           var tileMin = 0;
+           var tileMax = Math.pow(2, z0) - 1;
+           var log2ts = Math.log(_tileSize) * Math.LOG2E;
+           var k = Math.pow(2, z - z0 + log2ts);
+           var origin = [(_translate[0] - _scale / 2) / k, (_translate[1] - _scale / 2) / k];
+           var cols = range(clamp(Math.floor(-origin[0]) - _margin, tileMin, tileMax + 1), clamp(Math.ceil(_size[0] / k - origin[0]) + _margin, tileMin, tileMax + 1));
+           var rows = range(clamp(Math.floor(-origin[1]) - _margin, tileMin, tileMax + 1), clamp(Math.ceil(_size[1] / k - origin[1]) + _margin, tileMin, tileMax + 1));
+           var tiles = [];
 
-           // total margin of all possible split distributions where each node is at least m full
-           _allDistMargin(node, m, M, compare) {
-               node.children.sort(compare);
+           for (var i = 0; i < rows.length; i++) {
+             var y = rows[i];
 
-               const toBBox = this.toBBox;
-               const leftBBox = distBBox(node, 0, m, toBBox);
-               const rightBBox = distBBox(node, M - m, M, toBBox);
-               let margin = bboxMargin(leftBBox) + bboxMargin(rightBBox);
+             for (var j = 0; j < cols.length; j++) {
+               var x = cols[j];
 
-               for (let i = m; i < M - m; i++) {
-                   const child = node.children[i];
-                   extend$1(leftBBox, node.leaf ? toBBox(child) : child);
-                   margin += bboxMargin(leftBBox);
+               if (i >= _margin && i <= rows.length - _margin && j >= _margin && j <= cols.length - _margin) {
+                 tiles.unshift([x, y, z0]); // tiles in view at beginning
+               } else {
+                 tiles.push([x, y, z0]); // tiles in margin at the end
                }
+             }
+           }
 
-               for (let i = M - m - 1; i >= m; i--) {
-                   const child = node.children[i];
-                   extend$1(rightBBox, node.leaf ? toBBox(child) : child);
-                   margin += bboxMargin(rightBBox);
-               }
+           tiles.translate = origin;
+           tiles.scale = k;
+           return tiles;
+         }
+         /**
+          * getTiles() returns an array of tiles that cover the map view
+          */
 
-               return margin;
-           }
 
-           _adjustParentBBoxes(bbox, path, level) {
-               // adjust bboxes along the given tree path
-               for (let i = level; i >= 0; i--) {
-                   extend$1(path[i], bbox);
-               }
-           }
+         tiler.getTiles = function (projection) {
+           var origin = [projection.scale() * Math.PI - projection.translate()[0], projection.scale() * Math.PI - projection.translate()[1]];
+           this.size(projection.clipExtent()[1]).scale(projection.scale() * 2 * Math.PI).translate(projection.translate());
+           var tiles = tiler();
+           var ts = tiles.scale;
+           return tiles.map(function (tile) {
+             if (_skipNullIsland && nearNullIsland(tile)) {
+               return false;
+             }
 
-           _condense(path) {
-               // go through the path, removing empty nodes and updating bboxes
-               for (let i = path.length - 1, siblings; i >= 0; i--) {
-                   if (path[i].children.length === 0) {
-                       if (i > 0) {
-                           siblings = path[i - 1].children;
-                           siblings.splice(siblings.indexOf(path[i]), 1);
+             var x = tile[0] * ts - origin[0];
+             var y = tile[1] * ts - origin[1];
+             return {
+               id: tile.toString(),
+               xyz: tile,
+               extent: geoExtent(projection.invert([x, y + ts]), projection.invert([x + ts, y]))
+             };
+           }).filter(Boolean);
+         };
+         /**
+          * getGeoJSON() returns a FeatureCollection for debugging tiles
+          */
 
-                       } else this.clear();
 
-                   } else calcBBox(path[i], this.toBBox);
+         tiler.getGeoJSON = function (projection) {
+           var features = tiler.getTiles(projection).map(function (tile) {
+             return {
+               type: 'Feature',
+               properties: {
+                 id: tile.id,
+                 name: tile.id
+               },
+               geometry: {
+                 type: 'Polygon',
+                 coordinates: [tile.extent.polygon()]
                }
-           }
-       }
+             };
+           });
+           return {
+             type: 'FeatureCollection',
+             features: features
+           };
+         };
 
-       function findItem(item, items, equalsFn) {
-           if (!equalsFn) return items.indexOf(item);
+         tiler.tileSize = function (val) {
+           if (!arguments.length) return _tileSize;
+           _tileSize = val;
+           return tiler;
+         };
 
-           for (let i = 0; i < items.length; i++) {
-               if (equalsFn(item, items[i])) return i;
-           }
-           return -1;
-       }
+         tiler.zoomExtent = function (val) {
+           if (!arguments.length) return _zoomExtent;
+           _zoomExtent = val;
+           return tiler;
+         };
 
-       // calculate node's bbox from bboxes of its children
-       function calcBBox(node, toBBox) {
-           distBBox(node, 0, node.children.length, toBBox, node);
-       }
+         tiler.size = function (val) {
+           if (!arguments.length) return _size;
+           _size = val;
+           return tiler;
+         };
 
-       // min bounding rectangle of node children from k to p-1
-       function distBBox(node, k, p, toBBox, destNode) {
-           if (!destNode) destNode = createNode(null);
-           destNode.minX = Infinity;
-           destNode.minY = Infinity;
-           destNode.maxX = -Infinity;
-           destNode.maxY = -Infinity;
+         tiler.scale = function (val) {
+           if (!arguments.length) return _scale;
+           _scale = val;
+           return tiler;
+         };
 
-           for (let i = k; i < p; i++) {
-               const child = node.children[i];
-               extend$1(destNode, node.leaf ? toBBox(child) : child);
-           }
+         tiler.translate = function (val) {
+           if (!arguments.length) return _translate;
+           _translate = val;
+           return tiler;
+         }; // number to extend the rows/columns beyond those covering the viewport
 
-           return destNode;
-       }
 
-       function extend$1(a, b) {
-           a.minX = Math.min(a.minX, b.minX);
-           a.minY = Math.min(a.minY, b.minY);
-           a.maxX = Math.max(a.maxX, b.maxX);
-           a.maxY = Math.max(a.maxY, b.maxY);
-           return a;
-       }
+         tiler.margin = function (val) {
+           if (!arguments.length) return _margin;
+           _margin = +val;
+           return tiler;
+         };
 
-       function compareNodeMinX(a, b) { return a.minX - b.minX; }
-       function compareNodeMinY(a, b) { return a.minY - b.minY; }
+         tiler.skipNullIsland = function (val) {
+           if (!arguments.length) return _skipNullIsland;
+           _skipNullIsland = val;
+           return tiler;
+         };
 
-       function bboxArea(a)   { return (a.maxX - a.minX) * (a.maxY - a.minY); }
-       function bboxMargin(a) { return (a.maxX - a.minX) + (a.maxY - a.minY); }
+         return tiler;
+       }
 
-       function enlargedArea(a, b) {
-           return (Math.max(b.maxX, a.maxX) - Math.min(b.minX, a.minX)) *
-                  (Math.max(b.maxY, a.maxY) - Math.min(b.minY, a.minY));
+       function utilTriggerEvent(target, type) {
+         target.each(function () {
+           var evt = document.createEvent('HTMLEvents');
+           evt.initEvent(type, true, true);
+           this.dispatchEvent(evt);
+         });
        }
 
-       function intersectionArea(a, b) {
-           const minX = Math.max(a.minX, b.minX);
-           const minY = Math.max(a.minY, b.minY);
-           const maxX = Math.min(a.maxX, b.maxX);
-           const maxY = Math.min(a.maxY, b.maxY);
+       var _mainLocalizer = coreLocalizer(); // singleton
 
-           return Math.max(0, maxX - minX) *
-                  Math.max(0, maxY - minY);
-       }
 
-       function contains$1(a, b) {
-           return a.minX <= b.minX &&
-                  a.minY <= b.minY &&
-                  b.maxX <= a.maxX &&
-                  b.maxY <= a.maxY;
-       }
+       var _t = _mainLocalizer.t;
+       // coreLocalizer manages language and locale parameters including translated strings
+       //
 
-       function intersects(a, b) {
-           return b.minX <= a.maxX &&
-                  b.minY <= a.maxY &&
-                  b.maxX >= a.minX &&
-                  b.maxY >= a.minY;
-       }
+       function coreLocalizer() {
+         var localizer = {};
+         var _dataLanguages = {}; // `_dataLocales` is an object containing all _supported_ locale codes -> language info.
+         // * `rtl` - right-to-left or left-to-right text direction
+         // * `pct` - the percent of strings translated; 1 = 100%, full coverage
+         //
+         // {
+         // en: { rtl: false, pct: {…} },
+         // de: { rtl: false, pct: {…} },
+         // …
+         // }
 
-       function createNode(children) {
-           return {
-               children,
-               height: 1,
-               leaf: true,
-               minX: Infinity,
-               minY: Infinity,
-               maxX: -Infinity,
-               maxY: -Infinity
-           };
-       }
+         var _dataLocales = {}; // `localeStrings` is an object containing all _loaded_ locale codes -> string data.
+         // {
+         // en: { icons: {…}, toolbar: {…}, modes: {…}, operations: {…}, … },
+         // de: { icons: {…}, toolbar: {…}, modes: {…}, operations: {…}, … },
+         // …
+         // }
 
-       // sort an array so that items come in groups of n unsorted items, with groups sorted between each other;
-       // combines selection algorithm with binary divide & conquer approach
+         var _localeStrings = {}; // the current locale
 
-       function multiSelect(arr, left, right, n, compare) {
-           const stack = [left, right];
+         var _localeCode = 'en-US'; // `_localeCodes` must contain `_localeCode` first, optionally followed by fallbacks
 
-           while (stack.length) {
-               right = stack.pop();
-               left = stack.pop();
+         var _localeCodes = ['en-US', 'en'];
+         var _languageCode = 'en';
+         var _textDirection = 'ltr';
+         var _usesMetric = false;
+         var _languageNames = {};
+         var _scriptNames = {}; // getters for the current locale parameters
 
-               if (right - left <= n) continue;
+         localizer.localeCode = function () {
+           return _localeCode;
+         };
 
-               const mid = left + Math.ceil((right - left) / n / 2) * n;
-               quickselect(arr, mid, left, right, compare);
+         localizer.localeCodes = function () {
+           return _localeCodes;
+         };
 
-               stack.push(left, mid, mid, right);
-           }
-       }
+         localizer.languageCode = function () {
+           return _languageCode;
+         };
 
-       const tiler = utilTiler();
-       const dispatch$1 = dispatch('loaded');
-       const _tileZoom = 14;
-       const _krUrlRoot = 'https://www.keepright.at';
-       let _krData = { errorTypes: {}, localizeStrings: {} };
+         localizer.textDirection = function () {
+           return _textDirection;
+         };
 
-       // This gets reassigned if reset
-       let _cache;
+         localizer.usesMetric = function () {
+           return _usesMetric;
+         };
 
-       const _krRuleset = [
-         // no 20 - multiple node on same spot - these are mostly boundaries overlapping roads
-         30, 40, 50, 60, 70, 90, 100, 110, 120, 130, 150, 160, 170, 180,
-         190, 191, 192, 193, 194, 195, 196, 197, 198,
-         200, 201, 202, 203, 204, 205, 206, 207, 208, 210, 220,
-         230, 231, 232, 270, 280, 281, 282, 283, 284, 285,
-         290, 291, 292, 293, 294, 295, 296, 297, 298, 300, 310, 311, 312, 313,
-         320, 350, 360, 370, 380, 390, 400, 401, 402, 410, 411, 412, 413
-       ];
+         localizer.languageNames = function () {
+           return _languageNames;
+         };
 
+         localizer.scriptNames = function () {
+           return _scriptNames;
+         }; // The client app may want to manually set the locale, regardless of the
+         // settings provided by the browser
 
-       function abortRequest(controller) {
-         if (controller) {
-           controller.abort();
-         }
-       }
 
-       function abortUnwantedRequests(cache, tiles) {
-         Object.keys(cache.inflightTile).forEach(k => {
-           const wanted = tiles.find(tile => k === tile.id);
-           if (!wanted) {
-             abortRequest(cache.inflightTile[k]);
-             delete cache.inflightTile[k];
+         var _preferredLocaleCodes = [];
+
+         localizer.preferredLocaleCodes = function (codes) {
+           if (!arguments.length) return _preferredLocaleCodes;
+
+           if (typeof codes === 'string') {
+             // be generous and accept delimited strings as input
+             _preferredLocaleCodes = codes.split(/,|;| /gi).filter(Boolean);
+           } else {
+             _preferredLocaleCodes = codes;
            }
-         });
-       }
 
+           return localizer;
+         };
 
-       function encodeIssueRtree(d) {
-         return { minX: d.loc[0], minY: d.loc[1], maxX: d.loc[0], maxY: d.loc[1], data: d };
-       }
+         var _loadPromise;
 
+         localizer.ensureLoaded = function () {
+           if (_loadPromise) return _loadPromise;
+           return _loadPromise = Promise.all([// load the list of languages
+           _mainFileFetcher.get('languages'), // load the list of supported locales
+           _mainFileFetcher.get('locales')]).then(function (results) {
+             _dataLanguages = results[0];
+             _dataLocales = results[1];
+           }).then(function () {
+             var requestedLocales = (_preferredLocaleCodes || []). // List of locales preferred by the browser in priority order.
+             concat(utilDetect().browserLocales) // fallback to English since it's the only guaranteed complete language
+             .concat(['en']);
 
-       // Replace or remove QAItem from rtree
-       function updateRtree(item, replace) {
-         _cache.rtree.remove(item, (a, b) => a.data.id === b.data.id);
+             _localeCodes = localesToUseFrom(requestedLocales); // Run iD in the highest-priority locale; the rest are fallbacks
 
-         if (replace) {
-           _cache.rtree.insert(item);
-         }
-       }
+             _localeCode = _localeCodes[0]; // Will always return the index for `en` if nothing else
 
+             var fullCoverageIndex = _localeCodes.findIndex(function (locale) {
+               return _dataLocales[locale].pct === 1;
+             }); // We only need to load locales up until we find one with full coverage
 
-       function tokenReplacements(d) {
-         if (!(d instanceof QAItem)) return;
 
-         const htmlRegex = new RegExp(/<\/[a-z][\s\S]*>/);
-         const replacements = {};
+             var loadStringsPromises = _localeCodes.slice(0, fullCoverageIndex + 1).map(function (code) {
+               return localizer.loadLocale(code);
+             });
 
-         const issueTemplate = _krData.errorTypes[d.whichType];
-         if (!issueTemplate) {
-           /* eslint-disable no-console */
-           console.log('No Template: ', d.whichType);
-           console.log('  ', d.description);
-           /* eslint-enable no-console */
-           return;
-         }
+             return Promise.all(loadStringsPromises);
+           }).then(function () {
+             updateForCurrentLocale();
+           })["catch"](function (err) {
+             return console.error(err);
+           }); // eslint-disable-line
+         }; // Returns the locales from `requestedLocales` supported by iD that we should use
 
-         // some descriptions are just fixed text
-         if (!issueTemplate.regex) return;
 
-         // regex pattern should match description with variable details captured
-         const errorRegex = new RegExp(issueTemplate.regex, 'i');
-         const errorMatch = errorRegex.exec(d.description);
-         if (!errorMatch) {
-           /* eslint-disable no-console */
-           console.log('Unmatched: ', d.whichType);
-           console.log('  ', d.description);
-           console.log('  ', errorRegex);
-           /* eslint-enable no-console */
-           return;
+         function localesToUseFrom(requestedLocales) {
+           var supportedLocales = _dataLocales;
+           var toUse = [];
+
+           for (var i in requestedLocales) {
+             var locale = requestedLocales[i];
+             if (supportedLocales[locale]) toUse.push(locale);
+
+             if (locale.includes('-')) {
+               // Full locale ('es-ES'), add fallback to the base ('es')
+               var langPart = locale.split('-')[0];
+               if (supportedLocales[langPart]) toUse.push(langPart);
+             }
+           } // remove duplicates
+
+
+           return utilArrayUniq(toUse);
          }
 
-         for (let i = 1; i < errorMatch.length; i++) {   // skip first
-           let capture = errorMatch[i];
-           let idType;
+         function updateForCurrentLocale() {
+           if (!_localeCode) return;
+           _languageCode = _localeCode.split('-')[0];
+           var currentData = _dataLocales[_localeCode] || _dataLocales[_languageCode];
+           var hash = utilStringQs(window.location.hash);
 
-           idType = 'IDs' in issueTemplate ? issueTemplate.IDs[i-1] : '';
-           if (idType && capture) {   // link IDs if present in the capture
-             capture = parseError(capture, idType);
-           } else if (htmlRegex.test(capture)) {   // escape any html in non-IDs
-             capture = '\\' +  capture + '\\';
+           if (hash.rtl === 'true') {
+             _textDirection = 'rtl';
+           } else if (hash.rtl === 'false') {
+             _textDirection = 'ltr';
            } else {
-             const compare = capture.toLowerCase();
-             if (_krData.localizeStrings[compare]) {   // some replacement strings can be localized
-               capture = _t('QA.keepRight.error_parts.' + _krData.localizeStrings[compare]);
-             }
+             _textDirection = currentData && currentData.rtl ? 'rtl' : 'ltr';
            }
 
-           replacements['var' + i] = capture;
+           var locale = _localeCode;
+           if (locale.toLowerCase() === 'en-us') locale = 'en';
+           _languageNames = _localeStrings[locale].languageNames;
+           _scriptNames = _localeStrings[locale].scriptNames;
+           _usesMetric = _localeCode.slice(-3).toLowerCase() !== '-us';
          }
+         /* Locales */
+         // Returns a Promise to load the strings for the requested locale
 
-         return replacements;
-       }
 
+         localizer.loadLocale = function (requested) {
+           if (!_dataLocales) {
+             return Promise.reject('loadLocale called before init');
+           }
 
-       function parseError(capture, idType) {
-         const compare = capture.toLowerCase();
-         if (_krData.localizeStrings[compare]) {   // some replacement strings can be localized
-           capture = _t('QA.keepRight.error_parts.' + _krData.localizeStrings[compare]);
-         }
+           var locale = requested; // US English is the default
 
-         switch (idType) {
-           // link a string like "this node"
-           case 'this':
-             capture = linkErrorObject(capture);
-             break;
+           if (locale.toLowerCase() === 'en-us') locale = 'en';
 
-           case 'url':
-             capture = linkURL(capture);
-             break;
+           if (!_dataLocales[locale]) {
+             return Promise.reject("Unsupported locale: ".concat(requested));
+           }
 
-           // link an entity ID
-           case 'n':
-           case 'w':
-           case 'r':
-             capture = linkEntity(idType + capture);
-             break;
+           if (_localeStrings[locale]) {
+             // already loaded
+             return Promise.resolve(locale);
+           }
 
-           // some errors have more complex ID lists/variance
-           case '20':
-             capture = parse20(capture);
-             break;
-           case '211':
-             capture = parse211(capture);
-             break;
-           case '231':
-             capture = parse231(capture);
-             break;
-           case '294':
-             capture = parse294(capture);
-             break;
-           case '370':
-             capture = parse370(capture);
-             break;
-         }
+           var fileMap = _mainFileFetcher.fileMap();
+           var key = "locale_".concat(locale);
+           fileMap[key] = "locales/".concat(locale, ".json");
+           return _mainFileFetcher.get(key).then(function (d) {
+             _localeStrings[locale] = d[locale];
+             return locale;
+           });
+         };
 
-         return capture;
+         localizer.pluralRule = function (number) {
+           return pluralRule(number, _localeCode);
+         }; // Returns the plural rule for the given `number` with the given `localeCode`.
+         // One of: `zero`, `one`, `two`, `few`, `many`, `other`
 
 
-         function linkErrorObject(d) {
-           return `<a class="error_object_link">${d}</a>`;
-         }
+         function pluralRule(number, localeCode) {
+           // modern browsers have this functionality built-in
+           var rules = 'Intl' in window && Intl.PluralRules && new Intl.PluralRules(localeCode);
 
-         function linkEntity(d) {
-           return `<a class="error_entity_link">${d}</a>`;
-         }
+           if (rules) {
+             return rules.select(number);
+           } // fallback to basic one/other, as in English
 
-         function linkURL(d) {
-           return `<a class="kr_external_link" target="_blank" href="${d}">${d}</a>`;
+
+           if (number === 1) return 'one';
+           return 'other';
          }
+         /**
+         * Try to find that string in `locale` or the current `_localeCode` matching
+         * the given `stringId`. If no string can be found in the requested locale,
+         * we'll recurse down all the `_localeCodes` until one is found.
+         *
+         * @param  {string}   stringId      string identifier
+         * @param  {object?}  replacements  token replacements and default string
+         * @param  {string?}  locale        locale to use (defaults to currentLocale)
+         * @return {string?}  localized string
+         */
 
-         // arbitrary node list of form: #ID, #ID, #ID...
-         function parse211(capture) {
-           let newList = [];
-           const items = capture.split(', ');
 
-           items.forEach(item => {
-             // ID has # at the front
-             let id = linkEntity('n' + item.slice(1));
-             newList.push(id);
-           });
+         localizer.tInfo = function (stringId, replacements, locale) {
+           locale = locale || _localeCode;
+           var path = stringId.split('.').map(function (s) {
+             return s.replace(/<TX_DOT>/g, '.');
+           }).reverse();
+           var stringsKey = locale; // US English is the default
 
-           return newList.join(', ');
-         }
+           if (stringsKey.toLowerCase() === 'en-us') stringsKey = 'en';
+           var result = _localeStrings[stringsKey];
 
-         // arbitrary way list of form: #ID(layer),#ID(layer),#ID(layer)...
-         function parse231(capture) {
-           let newList = [];
-           // unfortunately 'layer' can itself contain commas, so we split on '),'
-           const items = capture.split('),');
+           while (result !== undefined && path.length) {
+             result = result[path.pop()];
+           }
 
-           items.forEach(item => {
-             const match = item.match(/\#(\d+)\((.+)\)?/);
-             if (match !== null && match.length > 2) {
-               newList.push(linkEntity('w' + match[1]) + ' ' +
-                 _t('QA.keepRight.errorTypes.231.layer', { layer: match[2] })
-               );
+           if (result !== undefined) {
+             if (replacements) {
+               if (_typeof(result) === 'object' && Object.keys(result).length) {
+                 // If plural forms are provided, dig one level deeper based on the
+                 // first numeric token replacement provided.
+                 var number = Object.values(replacements).find(function (value) {
+                   return typeof value === 'number';
+                 });
+
+                 if (number !== undefined) {
+                   var rule = pluralRule(number, locale);
+
+                   if (result[rule]) {
+                     result = result[rule];
+                   } else {
+                     // We're pretty sure this should be a plural but no string
+                     // could be found for the given rule. Just pick the first
+                     // string and hope it makes sense.
+                     result = Object.values(result)[0];
+                   }
+                 }
+               }
+
+               if (typeof result === 'string') {
+                 for (var key in replacements) {
+                   var value = replacements[key];
+
+                   if (typeof value === 'number' && value.toLocaleString) {
+                     // format numbers for the locale
+                     value = value.toLocaleString(locale, {
+                       style: 'decimal',
+                       useGrouping: true,
+                       minimumFractionDigits: 0
+                     });
+                   }
+
+                   var token = "{".concat(key, "}");
+                   var regex = new RegExp(token, 'g');
+                   result = result.replace(regex, value);
+                 }
+               }
              }
-           });
 
-           return newList.join(', ');
-         }
+             if (typeof result === 'string') {
+               // found a localized string!
+               return {
+                 text: result,
+                 locale: locale
+               };
+             }
+           } // no localized string found...
+           // attempt to fallback to a lower-priority language
 
-         // arbitrary node/relation list of form: from node #ID,to relation #ID,to node #ID...
-         function parse294(capture) {
-           let newList = [];
-           const items = capture.split(',');
 
-           items.forEach(item => {
-             // item of form "from/to node/relation #ID"
-             item = item.split(' ');
+           var index = _localeCodes.indexOf(locale);
 
-             // to/from role is more clear in quotes
-             const role = `"${item[0]}"`;
+           if (index >= 0 && index < _localeCodes.length - 1) {
+             // eventually this will be 'en' or another locale with 100% coverage
+             var fallback = _localeCodes[index + 1];
+             return localizer.tInfo(stringId, replacements, fallback);
+           }
 
-             // first letter of node/relation provides the type
-             const idType = item[1].slice(0,1);
+           if (replacements && 'default' in replacements) {
+             // Fallback to a default value if one is specified in `replacements`
+             return {
+               text: replacements["default"],
+               locale: null
+             };
+           }
 
-             // ID has # at the front
-             let id = item[2].slice(1);
-             id = linkEntity(idType + id);
+           var missing = "Missing ".concat(locale, " translation: ").concat(stringId);
+           if (typeof console !== 'undefined') console.error(missing); // eslint-disable-line
 
-             newList.push(`${role} ${item[1]} ${id}`);
-           });
+           return {
+             text: missing,
+             locale: 'en'
+           };
+         }; // Returns only the localized text, discarding the locale info
 
-           return newList.join(', ');
-         }
 
-         // may or may not include the string "(including the name 'name')"
-         function parse370(capture) {
-           if (!capture) return '';
+         localizer.t = function (stringId, replacements, locale) {
+           return localizer.tInfo(stringId, replacements, locale).text;
+         }; // Returns the localized text wrapped in an HTML element encoding the locale info
 
-           const match = capture.match(/\(including the name (\'.+\')\)/);
-           if (match && match.length) {
-             return _t('QA.keepRight.errorTypes.370.including_the_name', { name: match[1] });
-           }
-           return '';
-         }
 
-         // arbitrary node list of form: #ID,#ID,#ID...
-         function parse20(capture) {
-           let newList = [];
-           const items = capture.split(',');
+         localizer.t.html = function (stringId, replacements, locale) {
+           var info = localizer.tInfo(stringId, replacements, locale); // text may be empty or undefined if `replacements.default` is
 
-           items.forEach(item => {
-             // ID has # at the front
-             const id = linkEntity('n' + item.slice(1));
-             newList.push(id);
-           });
+           return info.text ? localizer.htmlForLocalizedText(info.text, info.locale) : '';
+         };
 
-           return newList.join(', ');
-         }
-       }
+         localizer.htmlForLocalizedText = function (text, localeCode) {
+           return "<span class=\"localized-text\" lang=\"".concat(localeCode || 'unknown', "\">").concat(text, "</span>");
+         };
 
+         localizer.languageName = function (code, options) {
+           if (_languageNames[code]) {
+             // name in locale language
+             // e.g. "German"
+             return _languageNames[code];
+           } // sometimes we only want the local name
 
-       var serviceKeepRight = {
-         title: 'keepRight',
 
-         init() {
-           _mainFileFetcher.get('keepRight')
-             .then(d => _krData = d);
+           if (options && options.localOnly) return null;
+           var langInfo = _dataLanguages[code];
 
-           if (!_cache) {
-             this.reset();
-           }
+           if (langInfo) {
+             if (langInfo.nativeName) {
+               // name in native language
+               // e.g. "Deutsch (de)"
+               return localizer.t('translate.language_and_code', {
+                 language: langInfo.nativeName,
+                 code: code
+               });
+             } else if (langInfo.base && langInfo.script) {
+               var base = langInfo.base; // the code of the language this is based on
 
-           this.event = utilRebind(this, dispatch$1, 'on');
-         },
+               if (_languageNames[base]) {
+                 // base language name in locale language
+                 var scriptCode = langInfo.script;
+                 var script = _scriptNames[scriptCode] || scriptCode; // e.g. "Serbian (Cyrillic)"
 
-         reset() {
-           if (_cache) {
-             Object.values(_cache.inflightTile).forEach(abortRequest);
+                 return localizer.t('translate.language_and_code', {
+                   language: _languageNames[base],
+                   code: script
+                 });
+               } else if (_dataLanguages[base] && _dataLanguages[base].nativeName) {
+                 // e.g. "српски (sr-Cyrl)"
+                 return localizer.t('translate.language_and_code', {
+                   language: _dataLanguages[base].nativeName,
+                   code: code
+                 });
+               }
+             }
            }
 
-           _cache = {
-             data: {},
-             loadedTile: {},
-             inflightTile: {},
-             inflightPost: {},
-             closed: {},
-             rtree: new RBush()
-           };
-         },
-
+           return code; // if not found, use the code
+         };
 
-         // KeepRight API:  http://osm.mueschelsoft.de/keepright/interfacing.php
-         loadIssues(projection) {
-           const options = {
-             format: 'geojson',
-             ch: _krRuleset
-           };
+         return localizer;
+       }
 
-           // determine the needed tiles to cover the view
-           const tiles = tiler
-             .zoomExtent([_tileZoom, _tileZoom])
-             .getTiles(projection);
+       // `presetCollection` is a wrapper around an `Array` of presets `collection`,
+       // and decorated with some extra methods for searching and matching geometry
+       //
 
-           // abort inflight requests that are no longer needed
-           abortUnwantedRequests(_cache, tiles);
+       function presetCollection(collection) {
+         var MAXRESULTS = 50;
+         var _this = {};
+         var _memo = {};
+         _this.collection = collection;
 
-           // issue new requests..
-           tiles.forEach(tile => {
-             if (_cache.loadedTile[tile.id] || _cache.inflightTile[tile.id]) return;
+         _this.item = function (id) {
+           if (_memo[id]) return _memo[id];
 
-             const [ left, top, right, bottom ] = tile.extent.rectangle();
-             const params = Object.assign({}, options, { left, bottom, right, top });
-             const url = `${_krUrlRoot}/export.php?` + utilQsString(params);
-             const controller = new AbortController();
+           var found = _this.collection.find(function (d) {
+             return d.id === id;
+           });
 
-             _cache.inflightTile[tile.id] = controller;
+           if (found) _memo[id] = found;
+           return found;
+         };
 
-             d3_json(url, { signal: controller.signal })
-               .then(data => {
-                 delete _cache.inflightTile[tile.id];
-                 _cache.loadedTile[tile.id] = true;
-                 if (!data || !data.features || !data.features.length) {
-                   throw new Error('No Data');
-                 }
+         _this.index = function (id) {
+           return _this.collection.findIndex(function (d) {
+             return d.id === id;
+           });
+         };
 
-                 data.features.forEach(feature => {
-                   const {
-                     properties: {
-                       error_type: itemType,
-                       error_id: id,
-                       comment = null,
-                       object_id: objectId,
-                       object_type: objectType,
-                       schema,
-                       title
-                     }
-                   } = feature;
-                   let {
-                     geometry: { coordinates: loc },
-                     properties: { description = '' }
-                   } = feature;
-
-                   // if there is a parent, save its error type e.g.:
-                   //  Error 191 = "highway-highway"
-                   //  Error 190 = "intersections without junctions"  (parent)
-                   const issueTemplate = _krData.errorTypes[itemType];
-                   const parentIssueType = (Math.floor(itemType / 10) * 10).toString();
-
-                   // try to handle error type directly, fallback to parent error type.
-                   const whichType = issueTemplate ? itemType : parentIssueType;
-                   const whichTemplate = _krData.errorTypes[whichType];
-
-                   // Rewrite a few of the errors at this point..
-                   // This is done to make them easier to linkify and translate.
-                   switch (whichType) {
-                     case '170':
-                       description = `This feature has a FIXME tag: ${description}`;
-                       break;
-                     case '292':
-                     case '293':
-                       description = description.replace('A turn-', 'This turn-');
-                       break;
-                     case '294':
-                     case '295':
-                     case '296':
-                     case '297':
-                     case '298':
-                       description = `This turn-restriction~${description}`;
-                       break;
-                     case '300':
-                       description = 'This highway is missing a maxspeed tag';
-                       break;
-                     case '411':
-                     case '412':
-                     case '413':
-                       description = `This feature~${description}`;
-                       break;
-                   }
+         _this.matchGeometry = function (geometry) {
+           return presetCollection(_this.collection.filter(function (d) {
+             return d.matchGeometry(geometry);
+           }));
+         };
 
-                   // move markers slightly so it doesn't obscure the geometry,
-                   // then move markers away from other coincident markers
-                   let coincident = false;
-                   do {
-                     // first time, move marker up. after that, move marker right.
-                     let delta = coincident ? [0.00001, 0] : [0, 0.00001];
-                     loc = geoVecAdd(loc, delta);
-                     let bbox = geoExtent(loc).bbox();
-                     coincident = _cache.rtree.search(bbox).length;
-                   } while (coincident);
-
-                   let d = new QAItem(loc, this, itemType, id, {
-                     comment,
-                     description,
-                     whichType,
-                     parentIssueType,
-                     severity: whichTemplate.severity || 'error',
-                     objectId,
-                     objectType,
-                     schema,
-                     title
-                   });
+         _this.matchAllGeometry = function (geometries) {
+           return presetCollection(_this.collection.filter(function (d) {
+             return d && d.matchAllGeometry(geometries);
+           }));
+         };
 
-                   d.replacements = tokenReplacements(d);
+         _this.matchAnyGeometry = function (geometries) {
+           return presetCollection(_this.collection.filter(function (d) {
+             return geometries.some(function (geom) {
+               return d.matchGeometry(geom);
+             });
+           }));
+         };
 
-                   _cache.data[id] = d;
-                   _cache.rtree.insert(encodeIssueRtree(d));
-                 });
+         _this.fallback = function (geometry) {
+           var id = geometry;
+           if (id === 'vertex') id = 'point';
+           return _this.item(id);
+         };
 
-                 dispatch$1.call('loaded');
-               })
-               .catch(() => {
-                 delete _cache.inflightTile[tile.id];
-                 _cache.loadedTile[tile.id] = true;
-               });
+         _this.search = function (value, geometry, countryCode) {
+           if (!value) return _this;
+           value = value.toLowerCase().trim(); // match at name beginning or just after a space (e.g. "office" -> match "Law Office")
 
-           });
-         },
+           function leading(a) {
+             var index = a.indexOf(value);
+             return index === 0 || a[index - 1] === ' ';
+           } // match at name beginning only
 
 
-         postUpdate(d, callback) {
-           if (_cache.inflightPost[d.id]) {
-             return callback({ message: 'Error update already inflight', status: -2 }, d);
+           function leadingStrict(a) {
+             var index = a.indexOf(value);
+             return index === 0;
            }
 
-           const params = { schema: d.schema, id: d.id };
+           function sortNames(a, b) {
+             var aCompare = (a.suggestion ? a.originalName : a.name()).toLowerCase();
+             var bCompare = (b.suggestion ? b.originalName : b.name()).toLowerCase(); // priority if search string matches preset name exactly - #4325
 
-           if (d.newStatus) {
-             params.st = d.newStatus;
-           }
-           if (d.newComment !== undefined) {
-             params.co = d.newComment;
-           }
+             if (value === aCompare) return -1;
+             if (value === bCompare) return 1; // priority for higher matchScore
 
-           // NOTE: This throws a CORS err, but it seems successful.
-           // We don't care too much about the response, so this is fine.
-           const url = `${_krUrlRoot}/comment.php?` + utilQsString(params);
-           const controller = new AbortController();
+             var i = b.originalScore - a.originalScore;
+             if (i !== 0) return i; // priority if search string appears earlier in preset name
 
-           _cache.inflightPost[d.id] = controller;
+             i = aCompare.indexOf(value) - bCompare.indexOf(value);
+             if (i !== 0) return i; // priority for shorter preset names
 
-           // Since this is expected to throw an error just continue as if it worked
-           // (worst case scenario the request truly fails and issue will show up if iD restarts)
-           d3_json(url, { signal: controller.signal })
-             .finally(() => {
-               delete _cache.inflightPost[d.id];
-
-               if (d.newStatus === 'ignore') {
-                 // ignore permanently (false positive)
-                 this.removeItem(d);
-               } else if (d.newStatus === 'ignore_t') {
-                 // ignore temporarily (error fixed)
-                 this.removeItem(d);
-                 _cache.closed[`${d.schema}:${d.id}`] = true;
-               } else {
-                 d = this.replaceItem(d.update({
-                   comment: d.newComment,
-                   newComment: undefined,
-                   newState: undefined
-                 }));
-               }
+             return aCompare.length - bCompare.length;
+           }
 
-               if (callback) callback(null, d);
-             });
-         },
+           var pool = _this.collection;
 
-         // Get all cached QAItems covering the viewport
-         getItems(projection) {
-           const viewport = projection.clipExtent();
-           const min = [viewport[0][0], viewport[1][1]];
-           const max = [viewport[1][0], viewport[0][1]];
-           const bbox = geoExtent(projection.invert(min), projection.invert(max)).bbox();
+           if (countryCode) {
+             pool = pool.filter(function (a) {
+               if (a.countryCodes && a.countryCodes.indexOf(countryCode) === -1) return false;
+               if (a.notCountryCodes && a.notCountryCodes.indexOf(countryCode) !== -1) return false;
+               return true;
+             });
+           }
 
-           return _cache.rtree.search(bbox).map(d => d.data);
-         },
+           var searchable = pool.filter(function (a) {
+             return a.searchable !== false && a.suggestion !== true;
+           });
+           var suggestions = pool.filter(function (a) {
+             return a.suggestion === true;
+           }); // matches value to preset.name
 
-         // Get a QAItem from cache
-         // NOTE: Don't change method name until UI v3 is merged
-         getError(id) {
-           return _cache.data[id];
-         },
+           var leading_name = searchable.filter(function (a) {
+             return leading(a.name().toLowerCase());
+           }).sort(sortNames); // matches value to preset suggestion name (original name is unhyphenated)
 
-         // Replace a single QAItem in the cache
-         replaceItem(item) {
-           if (!(item instanceof QAItem) || !item.id) return;
+           var leading_suggestions = suggestions.filter(function (a) {
+             return leadingStrict(a.originalName.toLowerCase());
+           }).sort(sortNames); // matches value to preset.terms values
 
-           _cache.data[item.id] = item;
-           updateRtree(encodeIssueRtree(item), true); // true = replace
-           return item;
-         },
+           var leading_terms = searchable.filter(function (a) {
+             return (a.terms() || []).some(leading);
+           }); // matches value to preset.tags values
 
-         // Remove a single QAItem from the cache
-         removeItem(item) {
-           if (!(item instanceof QAItem) || !item.id) return;
+           var leading_tag_values = searchable.filter(function (a) {
+             return Object.values(a.tags || {}).filter(function (val) {
+               return val !== '*';
+             }).some(leading);
+           }); // finds close matches to value in preset.name
 
-           delete _cache.data[item.id];
-           updateRtree(encodeIssueRtree(item), false); // false = remove
-         },
+           var similar_name = searchable.map(function (a) {
+             return {
+               preset: a,
+               dist: utilEditDistance(value, a.name())
+             };
+           }).filter(function (a) {
+             return a.dist + Math.min(value.length - a.preset.name().length, 0) < 3;
+           }).sort(function (a, b) {
+             return a.dist - b.dist;
+           }).map(function (a) {
+             return a.preset;
+           }); // finds close matches to value to preset suggestion name (original name is unhyphenated)
+
+           var similar_suggestions = suggestions.map(function (a) {
+             return {
+               preset: a,
+               dist: utilEditDistance(value, a.originalName.toLowerCase())
+             };
+           }).filter(function (a) {
+             return a.dist + Math.min(value.length - a.preset.originalName.length, 0) < 1;
+           }).sort(function (a, b) {
+             return a.dist - b.dist;
+           }).map(function (a) {
+             return a.preset;
+           }); // finds close matches to value in preset.terms
+
+           var similar_terms = searchable.filter(function (a) {
+             return (a.terms() || []).some(function (b) {
+               return utilEditDistance(value, b) + Math.min(value.length - b.length, 0) < 3;
+             });
+           });
+           var results = leading_name.concat(leading_suggestions, leading_terms, leading_tag_values, similar_name, similar_suggestions, similar_terms).slice(0, MAXRESULTS - 1);
 
-         issueURL(item) {
-           return `${_krUrlRoot}/report_map.php?schema=${item.schema}&error=${item.id}`;
-         },
+           if (geometry) {
+             if (typeof geometry === 'string') {
+               results.push(_this.fallback(geometry));
+             } else {
+               geometry.forEach(function (geom) {
+                 return results.push(_this.fallback(geom));
+               });
+             }
+           }
 
-         // Get an array of issues closed during this session.
-         // Used to populate `closed:keepright` changeset tag
-         getClosedIDs() {
-           return Object.keys(_cache.closed).sort();
-         }
+           return presetCollection(utilArrayUniq(results));
+         };
 
-       };
+         return _this;
+       }
 
-       const tiler$1 = utilTiler();
-       const dispatch$2 = dispatch('loaded');
-       const _tileZoom$1 = 14;
-       const _impOsmUrls = {
-         ow: 'https://grab.community.improve-osm.org/directionOfFlowService',
-         mr: 'https://grab.community.improve-osm.org/missingGeoService',
-         tr: 'https://grab.community.improve-osm.org/turnRestrictionService'
-       };
-       let _impOsmData = { icons: {} };
+       // `presetCategory` builds a `presetCollection` of member presets,
+       // decorated with some extra methods for searching and matching geometry
+       //
 
+       function presetCategory(categoryID, category, all) {
+         var _this = Object.assign({}, category); // shallow copy
 
-       // This gets reassigned if reset
-       let _cache$1;
 
-       function abortRequest$1(i) {
-         Object.values(i).forEach(controller => {
-           if (controller) {
-             controller.abort();
-           }
-         });
-       }
+         _this.id = categoryID;
+         _this.members = presetCollection(category.members.map(function (presetID) {
+           return all.item(presetID);
+         }).filter(Boolean));
+         _this.geometry = _this.members.collection.reduce(function (acc, preset) {
+           for (var i in preset.geometry) {
+             var geometry = preset.geometry[i];
 
-       function abortUnwantedRequests$1(cache, tiles) {
-         Object.keys(cache.inflightTile).forEach(k => {
-           const wanted = tiles.find(tile => k === tile.id);
-           if (!wanted) {
-             abortRequest$1(cache.inflightTile[k]);
-             delete cache.inflightTile[k];
+             if (acc.indexOf(geometry) === -1) {
+               acc.push(geometry);
+             }
            }
-         });
-       }
 
-       function encodeIssueRtree$1(d) {
-         return { minX: d.loc[0], minY: d.loc[1], maxX: d.loc[0], maxY: d.loc[1], data: d };
-       }
+           return acc;
+         }, []);
 
-       // Replace or remove QAItem from rtree
-       function updateRtree$1(item, replace) {
-         _cache$1.rtree.remove(item, (a, b) => a.data.id === b.data.id);
+         _this.matchGeometry = function (geom) {
+           return _this.geometry.indexOf(geom) >= 0;
+         };
 
-         if (replace) {
-           _cache$1.rtree.insert(item);
-         }
-       }
+         _this.matchAllGeometry = function (geometries) {
+           return _this.members.collection.some(function (preset) {
+             return preset.matchAllGeometry(geometries);
+           });
+         };
 
-       function linkErrorObject(d) {
-         return `<a class="error_object_link">${d}</a>`;
-       }
+         _this.matchScore = function () {
+           return -1;
+         };
 
-       function linkEntity(d) {
-         return `<a class="error_entity_link">${d}</a>`;
-       }
+         _this.name = function () {
+           return _t("presets.categories.".concat(categoryID, ".name"), {
+             'default': categoryID
+           });
+         };
 
-       function pointAverage(points) {
-         if (points.length) {
-           const sum = points.reduce(
-             (acc, point) => geoVecAdd(acc, [point.lon, point.lat]),
-             [0,0]
-           );
-           return geoVecScale(sum, 1 / points.length);
-         } else {
-           return [0,0];
-         }
-       }
+         _this.nameLabel = function () {
+           return _t.html("presets.categories.".concat(categoryID, ".name"), {
+             'default': categoryID
+           });
+         };
 
-       function relativeBearing(p1, p2) {
-         let angle = Math.atan2(p2.lon - p1.lon, p2.lat - p1.lat);
-         if (angle < 0) {
-           angle += 2 * Math.PI;
-         }
+         _this.terms = function () {
+           return [];
+         };
 
-         // Return degrees
-         return angle * 180 / Math.PI;
+         return _this;
        }
 
-       // Assuming range [0,360)
-       function cardinalDirection(bearing) {
-         const dir = 45 * Math.round(bearing / 45);
-         const compass = {
-           0: 'north',
-           45: 'northeast',
-           90: 'east',
-           135: 'southeast',
-           180: 'south',
-           225: 'southwest',
-           270: 'west',
-           315: 'northwest',
-           360: 'north'
-         };
+       // `presetField` decorates a given `field` Object
+       // with some extra methods for searching and matching geometry
+       //
 
-         return _t(`QA.improveOSM.directions.${compass[dir]}`);
-       }
+       function presetField(fieldID, field) {
+         var _this = Object.assign({}, field); // shallow copy
 
-       // Errors shouldn't obscure eachother
-       function preventCoincident(loc, bumpUp) {
-         let coincident = false;
-         do {
-           // first time, move marker up. after that, move marker right.
-           let delta = coincident ? [0.00001, 0] : (bumpUp ? [0, 0.00001] : [0, 0]);
-           loc = geoVecAdd(loc, delta);
-           let bbox = geoExtent(loc).bbox();
-           coincident = _cache$1.rtree.search(bbox).length;
-         } while (coincident);
 
-         return loc;
-       }
+         _this.id = fieldID; // for use in classes, element ids, css selectors
 
-       var serviceImproveOSM = {
-         title: 'improveOSM',
+         _this.safeid = utilSafeClassName(fieldID);
 
-         init() {
-           _mainFileFetcher.get('qa_data')
-             .then(d => _impOsmData = d.improveOSM);
+         _this.matchGeometry = function (geom) {
+           return !_this.geometry || _this.geometry.indexOf(geom) !== -1;
+         };
 
-           if (!_cache$1) {
-             this.reset();
-           }
+         _this.matchAllGeometry = function (geometries) {
+           return !_this.geometry || geometries.every(function (geom) {
+             return _this.geometry.indexOf(geom) !== -1;
+           });
+         };
 
-           this.event = utilRebind(this, dispatch$2, 'on');
-         },
+         _this.t = function (scope, options) {
+           return _t("presets.fields.".concat(fieldID, ".").concat(scope), options);
+         };
 
-         reset() {
-           if (_cache$1) {
-             Object.values(_cache$1.inflightTile).forEach(abortRequest$1);
-           }
-           _cache$1 = {
-             data: {},
-             loadedTile: {},
-             inflightTile: {},
-             inflightPost: {},
-             closed: {},
-             rtree: new RBush()
-           };
-         },
+         _this.t.html = function (scope, options) {
+           return _t.html("presets.fields.".concat(fieldID, ".").concat(scope), options);
+         };
 
-         loadIssues(projection) {
-           const options = {
-             client: 'iD',
-             status: 'OPEN',
-             zoom: '19' // Use a high zoom so that clusters aren't returned
-           };
+         _this.title = function () {
+           return _this.overrideLabel || _this.t('label', {
+             'default': fieldID
+           });
+         };
 
-           // determine the needed tiles to cover the view
-           const tiles = tiler$1
-             .zoomExtent([_tileZoom$1, _tileZoom$1])
-             .getTiles(projection);
+         _this.label = function () {
+           return _this.overrideLabel || _this.t.html('label', {
+             'default': fieldID
+           });
+         };
 
-           // abort inflight requests that are no longer needed
-           abortUnwantedRequests$1(_cache$1, tiles);
+         var _placeholder = _this.placeholder;
 
-           // issue new requests..
-           tiles.forEach(tile => {
-             if (_cache$1.loadedTile[tile.id] || _cache$1.inflightTile[tile.id]) return;
+         _this.placeholder = function () {
+           return _this.t('placeholder', {
+             'default': _placeholder
+           });
+         };
 
-             const [ east, north, west, south ] = tile.extent.rectangle();
-             const params = Object.assign({}, options, { east, south, west, north });
+         _this.originalTerms = (_this.terms || []).join();
 
-             // 3 separate requests to store for each tile
-             const requests = {};
+         _this.terms = function () {
+           return _this.t('terms', {
+             'default': _this.originalTerms
+           }).toLowerCase().trim().split(/\s*,+\s*/);
+         };
 
-             Object.keys(_impOsmUrls).forEach(k => {
-               // We exclude WATER from missing geometry as it doesn't seem useful
-               // We use most confident one-way and turn restrictions only, still have false positives
-               const kParams = Object.assign({},
-                 params,
-                 (k === 'mr') ? { type: 'PARKING,ROAD,BOTH,PATH' } : { confidenceLevel: 'C1' }
-               );
-               const url = `${_impOsmUrls[k]}/search?` + utilQsString(kParams);
-               const controller = new AbortController();
+         _this.increment = _this.type === 'number' ? _this.increment || 1 : undefined;
+         return _this;
+       }
 
-               requests[k] = controller;
+       // `Array.prototype.lastIndexOf` method
+       // https://tc39.github.io/ecma262/#sec-array.prototype.lastindexof
+       _export({ target: 'Array', proto: true, forced: arrayLastIndexOf !== [].lastIndexOf }, {
+         lastIndexOf: arrayLastIndexOf
+       });
 
-               d3_json(url, { signal: controller.signal })
-                 .then(data => {
-                   delete _cache$1.inflightTile[tile.id][k];
-                   if (!Object.keys(_cache$1.inflightTile[tile.id]).length) {
-                     delete _cache$1.inflightTile[tile.id];
-                     _cache$1.loadedTile[tile.id] = true;
-                   }
+       // `presetPreset` decorates a given `preset` Object
+       // with some extra methods for searching and matching geometry
+       //
 
-                   // Road segments at high zoom == oneways
-                   if (data.roadSegments) {
-                     data.roadSegments.forEach(feature => {
-                       // Position error at the approximate middle of the segment
-                       const { points, wayId, fromNodeId, toNodeId } = feature;
-                       const itemId = `${wayId}${fromNodeId}${toNodeId}`;
-                       let mid = points.length / 2;
-                       let loc;
-
-                       // Even number of points, find midpoint of the middle two
-                       // Odd number of points, use position of very middle point
-                       if (mid % 1 === 0) {
-                         loc = pointAverage([points[mid - 1], points[mid]]);
-                       } else {
-                         mid = points[Math.floor(mid)];
-                         loc = [mid.lon, mid.lat];
-                       }
+       function presetPreset(presetID, preset, addable, allFields, allPresets) {
+         allFields = allFields || {};
+         allPresets = allPresets || {};
 
-                       // One-ways can land on same segment in opposite direction
-                       loc = preventCoincident(loc, false);
-
-                       let d = new QAItem(loc, this, k, itemId, {
-                         issueKey: k, // used as a category
-                         identifier: { // used to post changes
-                           wayId,
-                           fromNodeId,
-                           toNodeId
-                         },
-                         objectId: wayId,
-                         objectType: 'way'
-                       });
+         var _this = Object.assign({}, preset); // shallow copy
 
-                       // Variables used in the description
-                       d.replacements = {
-                         percentage: feature.percentOfTrips,
-                         num_trips: feature.numberOfTrips,
-                         highway: linkErrorObject(_t('QA.keepRight.error_parts.highway')),
-                         from_node: linkEntity('n' + feature.fromNodeId),
-                         to_node: linkEntity('n' + feature.toNodeId)
-                       };
 
-                       _cache$1.data[d.id] = d;
-                       _cache$1.rtree.insert(encodeIssueRtree$1(d));
-                     });
-                   }
+         var _addable = addable || false;
 
-                   // Tiles at high zoom == missing roads
-                   if (data.tiles) {
-                     data.tiles.forEach(feature => {
-                       const { type, x, y, numberOfTrips } = feature;
-                       const geoType = type.toLowerCase();
-                       const itemId = `${geoType}${x}${y}${numberOfTrips}`;
-
-                       // Average of recorded points should land on the missing geometry
-                       // Missing geometry could happen to land on another error
-                       let loc = pointAverage(feature.points);
-                       loc = preventCoincident(loc, false);
-
-                       let d = new QAItem(loc, this, `${k}-${geoType}`, itemId, {
-                         issueKey: k,
-                         identifier: { x, y }
-                       });
+         var _resolvedFields; // cache
 
-                       d.replacements = {
-                         num_trips: numberOfTrips,
-                         geometry_type: _t(`QA.improveOSM.geometry_types.${geoType}`)
-                       };
 
-                       // -1 trips indicates data came from a 3rd party
-                       if (numberOfTrips === -1) {
-                         d.desc = _t('QA.improveOSM.error_types.mr.description_alt', d.replacements);
-                       }
+         var _resolvedMoreFields; // cache
 
-                       _cache$1.data[d.id] = d;
-                       _cache$1.rtree.insert(encodeIssueRtree$1(d));
-                     });
-                   }
 
-                   // Entities at high zoom == turn restrictions
-                   if (data.entities) {
-                     data.entities.forEach(feature => {
-                       const { point, id, segments, numberOfPasses, turnType } = feature;
-                       const itemId = `${id.replace(/[,:+#]/g, '_')}`;
-
-                       // Turn restrictions could be missing at same junction
-                       // We also want to bump the error up so node is accessible
-                       const loc = preventCoincident([point.lon, point.lat], true);
-
-                       // Elements are presented in a strange way
-                       const ids = id.split(',');
-                       const from_way = ids[0];
-                       const via_node = ids[3];
-                       const to_way = ids[2].split(':')[1];
-
-                       let d = new QAItem(loc, this, k, itemId, {
-                         issueKey: k,
-                         identifier: id,
-                         objectId: via_node,
-                         objectType: 'node'
-                       });
+         _this.id = presetID;
+         _this.safeid = utilSafeClassName(presetID); // for use in css classes, selectors, element ids
 
-                       // Travel direction along from_way clarifies the turn restriction
-                       const [ p1, p2 ] = segments[0].points;
-                       const dir_of_travel = cardinalDirection(relativeBearing(p1, p2));
-
-                       // Variables used in the description
-                       d.replacements = {
-                         num_passed: numberOfPasses,
-                         num_trips: segments[0].numberOfTrips,
-                         turn_restriction: turnType.toLowerCase(),
-                         from_way: linkEntity('w' + from_way),
-                         to_way: linkEntity('w' + to_way),
-                         travel_direction: dir_of_travel,
-                         junction: linkErrorObject(_t('QA.keepRight.error_parts.this_node'))
-                       };
+         _this.originalTerms = (_this.terms || []).join();
+         _this.originalName = _this.name || '';
+         _this.originalScore = _this.matchScore || 1;
+         _this.originalReference = _this.reference || {};
+         _this.originalFields = _this.fields || [];
+         _this.originalMoreFields = _this.moreFields || [];
 
-                       _cache$1.data[d.id] = d;
-                       _cache$1.rtree.insert(encodeIssueRtree$1(d));
-                       dispatch$2.call('loaded');
-                     });
-                   }
-                 })
-                 .catch(() => {
-                   delete _cache$1.inflightTile[tile.id][k];
-                   if (!Object.keys(_cache$1.inflightTile[tile.id]).length) {
-                     delete _cache$1.inflightTile[tile.id];
-                     _cache$1.loadedTile[tile.id] = true;
-                   }
-                 });
-             });
+         _this.fields = function () {
+           return _resolvedFields || (_resolvedFields = resolve('fields'));
+         };
 
-             _cache$1.inflightTile[tile.id] = requests;
-           });
-         },
+         _this.moreFields = function () {
+           return _resolvedMoreFields || (_resolvedMoreFields = resolve('moreFields'));
+         };
 
-         getComments(item) {
-           // If comments already retrieved no need to do so again
-           if (item.comments) {
-             return Promise.resolve(item);
-           }
+         _this.resetFields = function () {
+           return _resolvedFields = _resolvedMoreFields = null;
+         };
 
-           const key = item.issueKey;
-           let qParams = {};
+         _this.tags = _this.tags || {};
+         _this.addTags = _this.addTags || _this.tags;
+         _this.removeTags = _this.removeTags || _this.addTags;
+         _this.geometry = _this.geometry || [];
 
-           if (key === 'ow') {
-             qParams = item.identifier;
-           } else if (key === 'mr') {
-             qParams.tileX = item.identifier.x;
-             qParams.tileY = item.identifier.y;
-           } else if (key === 'tr') {
-             qParams.targetId = item.identifier;
-           }
+         _this.matchGeometry = function (geom) {
+           return _this.geometry.indexOf(geom) >= 0;
+         };
 
-           const url = `${_impOsmUrls[key]}/retrieveComments?` + utilQsString(qParams);
-           const cacheComments = data => {
-             // Assign directly for immediate use afterwards
-             // comments are served newest to oldest
-             item.comments = data.comments ? data.comments.reverse() : [];
-             this.replaceItem(item);
-           };
+         _this.matchAllGeometry = function (geoms) {
+           return geoms.every(_this.matchGeometry);
+         };
 
-           return d3_json(url).then(cacheComments).then(() => item);
-         },
+         _this.matchScore = function (entityTags) {
+           var tags = _this.tags;
+           var seen = {};
+           var score = 0; // match on tags
 
-         postUpdate(d, callback) {
-           if (!serviceOsm.authenticated()) { // Username required in payload
-             return callback({ message: 'Not Authenticated', status: -3}, d);
-           }
-           if (_cache$1.inflightPost[d.id]) {
-             return callback({ message: 'Error update already inflight', status: -2 }, d);
-           }
+           for (var k in tags) {
+             seen[k] = true;
 
-           // Payload can only be sent once username is established
-           serviceOsm.userDetails(sendPayload.bind(this));
+             if (entityTags[k] === tags[k]) {
+               score += _this.originalScore;
+             } else if (tags[k] === '*' && k in entityTags) {
+               score += _this.originalScore / 2;
+             } else {
+               return -1;
+             }
+           } // boost score for additional matches in addTags - #6802
 
-           function sendPayload(err, user) {
-             if (err) { return callback(err, d); }
 
-             const key = d.issueKey;
-             const url = `${_impOsmUrls[key]}/comment`;
-             const payload = {
-               username: user.display_name,
-               targetIds: [ d.identifier ]
-             };
+           var addTags = _this.addTags;
 
-             if (d.newStatus) {
-               payload.status = d.newStatus;
-               payload.text = 'status changed';
+           for (var _k in addTags) {
+             if (!seen[_k] && entityTags[_k] === addTags[_k]) {
+               score += _this.originalScore;
              }
+           }
 
-             // Comment take place of default text
-             if (d.newComment) {
-               payload.text = d.newComment;
-             }
+           return score;
+         };
 
-             const controller = new AbortController();
-             _cache$1.inflightPost[d.id] = controller;
+         _this.t = function (scope, options) {
+           var textID = "presets.presets.".concat(presetID, ".").concat(scope);
+           return _t(textID, options);
+         };
 
-             const options = {
-               method: 'POST',
-               signal: controller.signal,
-               body: JSON.stringify(payload)
-             };
+         _this.t.html = function (scope, options) {
+           var textID = "presets.presets.".concat(presetID, ".").concat(scope);
+           return _t.html(textID, options);
+         };
 
-             d3_json(url, options)
-               .then(() => {
-                 delete _cache$1.inflightPost[d.id];
+         _this.name = function () {
+           return _this.t('name', {
+             'default': _this.originalName
+           });
+         };
 
-                 // Just a comment, update error in cache
-                 if (!d.newStatus) {
-                   const now = new Date();
-                   let comments = d.comments ? d.comments : [];
+         _this.nameLabel = function () {
+           return _this.t.html('name', {
+             'default': _this.originalName
+           });
+         };
 
-                   comments.push({
-                     username: payload.username,
-                     text: payload.text,
-                     timestamp: now.getTime() / 1000
-                   });
+         _this.subtitle = function () {
+           if (_this.suggestion) {
+             var path = presetID.split('/');
+             path.pop(); // remove brand name
 
-                   this.replaceItem(d.update({
-                     comments: comments,
-                     newComment: undefined
-                   }));
-                 } else {
-                   this.removeItem(d);
-                   if (d.newStatus === 'SOLVED') {
-                     // Keep track of the number of issues closed per type to tag the changeset
-                     if (!(d.issueKey in _cache$1.closed)) {
-                       _cache$1.closed[d.issueKey] = 0;
-                     }
-                     _cache$1.closed[d.issueKey] += 1;
-                   }
-                 }
-                 if (callback) callback(null, d);
-               })
-               .catch(err => {
-                 delete _cache$1.inflightPost[d.id];
-                 if (callback) callback(err.message);
-               });
+             return _t('presets.presets.' + path.join('/') + '.name');
            }
-         },
 
+           return null;
+         };
 
-         // Get all cached QAItems covering the viewport
-         getItems(projection) {
-           const viewport = projection.clipExtent();
-           const min = [viewport[0][0], viewport[1][1]];
-           const max = [viewport[1][0], viewport[0][1]];
-           const bbox = geoExtent(projection.invert(min), projection.invert(max)).bbox();
+         _this.subtitleLabel = function () {
+           if (_this.suggestion) {
+             var path = presetID.split('/');
+             path.pop(); // remove brand name
 
-           return _cache$1.rtree.search(bbox).map(d => d.data);
-         },
+             return _t.html('presets.presets.' + path.join('/') + '.name');
+           }
 
-         // Get a QAItem from cache
-         // NOTE: Don't change method name until UI v3 is merged
-         getError(id) {
-           return _cache$1.data[id];
-         },
+           return null;
+         };
 
-         // get the name of the icon to display for this item
-         getIcon(itemType) {
-           return _impOsmData.icons[itemType];
-         },
+         _this.terms = function () {
+           return _this.t('terms', {
+             'default': _this.originalTerms
+           }).toLowerCase().trim().split(/\s*,+\s*/);
+         };
 
-         // Replace a single QAItem in the cache
-         replaceItem(issue) {
-           if (!(issue instanceof QAItem) || !issue.id) return;
+         _this.isFallback = function () {
+           var tagCount = Object.keys(_this.tags).length;
+           return tagCount === 0 || tagCount === 1 && _this.tags.hasOwnProperty('area');
+         };
 
-           _cache$1.data[issue.id] = issue;
-           updateRtree$1(encodeIssueRtree$1(issue), true); // true = replace
-           return issue;
-         },
+         _this.addable = function (val) {
+           if (!arguments.length) return _addable;
+           _addable = val;
+           return _this;
+         };
 
-         // Remove a single QAItem from the cache
-         removeItem(issue) {
-           if (!(issue instanceof QAItem) || !issue.id) return;
+         _this.reference = function () {
+           // Lookup documentation on Wikidata...
+           var qid = _this.tags.wikidata || _this.tags['brand:wikidata'] || _this.tags['operator:wikidata'];
 
-           delete _cache$1.data[issue.id];
-           updateRtree$1(encodeIssueRtree$1(issue), false); // false = remove
-         },
+           if (qid) {
+             return {
+               qid: qid
+             };
+           } // Lookup documentation on OSM Wikibase...
 
-         // Used to populate `closed:improveosm:*` changeset tags
-         getClosedCounts() {
-           return _cache$1.closed;
-         }
-       };
 
-       var defaults = createCommonjsModule(function (module) {
-       function getDefaults() {
-         return {
-           baseUrl: null,
-           breaks: false,
-           gfm: true,
-           headerIds: true,
-           headerPrefix: '',
-           highlight: null,
-           langPrefix: 'language-',
-           mangle: true,
-           pedantic: false,
-           renderer: null,
-           sanitize: false,
-           sanitizer: null,
-           silent: false,
-           smartLists: false,
-           smartypants: false,
-           tokenizer: null,
-           xhtml: false
-         };
-       }
-
-       function changeDefaults(newDefaults) {
-         module.exports.defaults = newDefaults;
-       }
-
-       module.exports = {
-         defaults: getDefaults(),
-         getDefaults,
-         changeDefaults
-       };
-       });
+           var key = _this.originalReference.key || Object.keys(utilObjectOmit(_this.tags, 'name'))[0];
+           var value = _this.originalReference.value || _this.tags[key];
 
-       /**
-        * Helpers
-        */
-       const escapeTest = /[&<>"']/;
-       const escapeReplace = /[&<>"']/g;
-       const escapeTestNoEncode = /[<>"']|&(?!#?\w+;)/;
-       const escapeReplaceNoEncode = /[<>"']|&(?!#?\w+;)/g;
-       const escapeReplacements = {
-         '&': '&amp;',
-         '<': '&lt;',
-         '>': '&gt;',
-         '"': '&quot;',
-         "'": '&#39;'
-       };
-       const getEscapeReplacement = (ch) => escapeReplacements[ch];
-       function escape$1(html, encode) {
-         if (encode) {
-           if (escapeTest.test(html)) {
-             return html.replace(escapeReplace, getEscapeReplacement);
-           }
-         } else {
-           if (escapeTestNoEncode.test(html)) {
-             return html.replace(escapeReplaceNoEncode, getEscapeReplacement);
+           if (value === '*') {
+             return {
+               key: key
+             };
+           } else {
+             return {
+               key: key,
+               value: value
+             };
            }
-         }
-
-         return html;
-       }
+         };
 
-       const unescapeTest = /&(#(?:\d+)|(?:#x[0-9A-Fa-f]+)|(?:\w+));?/ig;
+         _this.unsetTags = function (tags, geometry, skipFieldDefaults) {
+           tags = utilObjectOmit(tags, Object.keys(_this.removeTags));
 
-       function unescape$1(html) {
-         // explicitly match decimal, hex, and named HTML entities
-         return html.replace(unescapeTest, (_, n) => {
-           n = n.toLowerCase();
-           if (n === 'colon') return ':';
-           if (n.charAt(0) === '#') {
-             return n.charAt(1) === 'x'
-               ? String.fromCharCode(parseInt(n.substring(2), 16))
-               : String.fromCharCode(+n.substring(1));
+           if (geometry && !skipFieldDefaults) {
+             _this.fields().forEach(function (field) {
+               if (field.matchGeometry(geometry) && field.key && field["default"] === tags[field.key]) {
+                 delete tags[field.key];
+               }
+             });
            }
-           return '';
-         });
-       }
 
-       const caret = /(^|[^\[])\^/g;
-       function edit(regex, opt) {
-         regex = regex.source || regex;
-         opt = opt || '';
-         const obj = {
-           replace: (name, val) => {
-             val = val.source || val;
-             val = val.replace(caret, '$1');
-             regex = regex.replace(name, val);
-             return obj;
-           },
-           getRegex: () => {
-             return new RegExp(regex, opt);
-           }
+           delete tags.area;
+           return tags;
          };
-         return obj;
-       }
 
-       const nonWordAndColonTest = /[^\w:]/g;
-       const originIndependentUrl = /^$|^[a-z][a-z0-9+.-]*:|^[?#]/i;
-       function cleanUrl(sanitize, base, href) {
-         if (sanitize) {
-           let prot;
-           try {
-             prot = decodeURIComponent(unescape$1(href))
-               .replace(nonWordAndColonTest, '')
-               .toLowerCase();
-           } catch (e) {
-             return null;
+         _this.setTags = function (tags, geometry, skipFieldDefaults) {
+           var addTags = _this.addTags;
+           tags = Object.assign({}, tags); // shallow copy
+
+           for (var k in addTags) {
+             if (addTags[k] === '*') {
+               tags[k] = 'yes';
+             } else {
+               tags[k] = addTags[k];
+             }
+           } // Add area=yes if necessary.
+           // This is necessary if the geometry is already an area (e.g. user drew an area) AND any of:
+           // 1. chosen preset could be either an area or a line (`barrier=city_wall`)
+           // 2. chosen preset doesn't have a key in osmAreaKeys (`railway=station`)
+
+
+           if (!addTags.hasOwnProperty('area')) {
+             delete tags.area;
+
+             if (geometry === 'area') {
+               var needsAreaTag = true;
+
+               if (_this.geometry.indexOf('line') === -1) {
+                 for (var _k2 in addTags) {
+                   if (_k2 in osmAreaKeys) {
+                     needsAreaTag = false;
+                     break;
+                   }
+                 }
+               }
+
+               if (needsAreaTag) {
+                 tags.area = 'yes';
+               }
+             }
            }
-           if (prot.indexOf('javascript:') === 0 || prot.indexOf('vbscript:') === 0 || prot.indexOf('data:') === 0) {
-             return null;
+
+           if (geometry && !skipFieldDefaults) {
+             _this.fields().forEach(function (field) {
+               if (field.matchGeometry(geometry) && field.key && !tags[field.key] && field["default"]) {
+                 tags[field.key] = field["default"];
+               }
+             });
            }
-         }
-         if (base && !originIndependentUrl.test(href)) {
-           href = resolveUrl(base, href);
-         }
-         try {
-           href = encodeURI(href).replace(/%25/g, '%');
-         } catch (e) {
-           return null;
-         }
-         return href;
-       }
 
-       const baseUrls = {};
-       const justDomain = /^[^:]+:\/*[^/]*$/;
-       const protocol = /^([^:]+:)[\s\S]*$/;
-       const domain = /^([^:]+:\/*[^/]*)[\s\S]*$/;
+           return tags;
+         }; // For a preset without fields, use the fields of the parent preset.
+         // Replace {preset} placeholders with the fields of the specified presets.
 
-       function resolveUrl(base, href) {
-         if (!baseUrls[' ' + base]) {
-           // we can ignore everything in base after the last slash of its path component,
-           // but we might need to add _that_
-           // https://tools.ietf.org/html/rfc3986#section-3
-           if (justDomain.test(base)) {
-             baseUrls[' ' + base] = base + '/';
-           } else {
-             baseUrls[' ' + base] = rtrim(base, '/', true);
-           }
-         }
-         base = baseUrls[' ' + base];
-         const relativeBase = base.indexOf(':') === -1;
 
-         if (href.substring(0, 2) === '//') {
-           if (relativeBase) {
-             return href;
-           }
-           return base.replace(protocol, '$1') + href;
-         } else if (href.charAt(0) === '/') {
-           if (relativeBase) {
-             return href;
-           }
-           return base.replace(domain, '$1') + href;
-         } else {
-           return base + href;
-         }
-       }
+         function resolve(which) {
+           var fieldIDs = which === 'fields' ? _this.originalFields : _this.originalMoreFields;
+           var resolved = [];
+           fieldIDs.forEach(function (fieldID) {
+             var match = fieldID.match(/\{(.*)\}/);
+
+             if (match !== null) {
+               // a presetID wrapped in braces {}
+               resolved = resolved.concat(inheritFields(match[1], which));
+             } else if (allFields[fieldID]) {
+               // a normal fieldID
+               resolved.push(allFields[fieldID]);
+             } else {
+               console.log("Cannot resolve \"".concat(fieldID, "\" found in ").concat(_this.id, ".").concat(which)); // eslint-disable-line no-console
+             }
+           }); // no fields resolved, so use the parent's if possible
 
-       const noopTest = { exec: function noopTest() {} };
+           if (!resolved.length) {
+             var endIndex = _this.id.lastIndexOf('/');
 
-       function merge$1(obj) {
-         let i = 1,
-           target,
-           key;
+             var parentID = endIndex && _this.id.substring(0, endIndex);
 
-         for (; i < arguments.length; i++) {
-           target = arguments[i];
-           for (key in target) {
-             if (Object.prototype.hasOwnProperty.call(target, key)) {
-               obj[key] = target[key];
+             if (parentID) {
+               resolved = inheritFields(parentID, which);
              }
            }
-         }
 
-         return obj;
-       }
+           return utilArrayUniq(resolved); // returns an array of fields to inherit from the given presetID, if found
 
-       function splitCells(tableRow, count) {
-         // ensure that every cell-delimiting pipe has a space
-         // before it to distinguish it from an escaped pipe
-         const row = tableRow.replace(/\|/g, (match, offset, str) => {
-             let escaped = false,
-               curr = offset;
-             while (--curr >= 0 && str[curr] === '\\') escaped = !escaped;
-             if (escaped) {
-               // odd number of slashes means | is escaped
-               // so we leave it alone
-               return '|';
+           function inheritFields(presetID, which) {
+             var parent = allPresets[presetID];
+             if (!parent) return [];
+
+             if (which === 'fields') {
+               return parent.fields().filter(shouldInherit);
+             } else if (which === 'moreFields') {
+               return parent.moreFields();
              } else {
-               // add space before unescaped |
-               return ' |';
+               return [];
              }
-           }),
-           cells = row.split(/ \|/);
-         let i = 0;
+           } // Skip `fields` for the keys which define the preset.
+           // These are usually `typeCombo` fields like `shop=*`
 
-         if (cells.length > count) {
-           cells.splice(count);
-         } else {
-           while (cells.length < count) cells.push('');
-         }
 
-         for (; i < cells.length; i++) {
-           // leading or trailing whitespace is ignored per the gfm spec
-           cells[i] = cells[i].trim().replace(/\\\|/g, '|');
+           function shouldInherit(f) {
+             if (f.key && _this.tags[f.key] !== undefined && // inherit anyway if multiple values are allowed or just a checkbox
+             f.type !== 'multiCombo' && f.type !== 'semiCombo' && f.type !== 'manyCombo' && f.type !== 'check') return false;
+             return true;
+           }
          }
-         return cells;
+
+         return _this;
        }
 
-       // Remove trailing 'c's. Equivalent to str.replace(/c*$/, '').
-       // /c*$/ is vulnerable to REDOS.
-       // invert: Remove suffix of non-c chars instead. Default falsey.
-       function rtrim(str, c, invert) {
-         const l = str.length;
-         if (l === 0) {
-           return '';
-         }
+       var _mainPresetIndex = presetIndex(); // singleton
+       // `presetIndex` wraps a `presetCollection`
+       // with methods for loading new data and returning defaults
+       //
 
-         // Length of suffix matching the invert condition.
-         let suffLen = 0;
+       function presetIndex() {
+         var dispatch$1 = dispatch('favoritePreset', 'recentsChange');
+         var MAXRECENTS = 30; // seed the preset lists with geometry fallbacks
 
-         // Step left until we fail to match the invert condition.
-         while (suffLen < l) {
-           const currChar = str.charAt(l - suffLen - 1);
-           if (currChar === c && !invert) {
-             suffLen++;
-           } else if (currChar !== c && invert) {
-             suffLen++;
-           } else {
-             break;
-           }
-         }
+         var POINT = presetPreset('point', {
+           name: 'Point',
+           tags: {},
+           geometry: ['point', 'vertex'],
+           matchScore: 0.1
+         });
+         var LINE = presetPreset('line', {
+           name: 'Line',
+           tags: {},
+           geometry: ['line'],
+           matchScore: 0.1
+         });
+         var AREA = presetPreset('area', {
+           name: 'Area',
+           tags: {
+             area: 'yes'
+           },
+           geometry: ['area'],
+           matchScore: 0.1
+         });
+         var RELATION = presetPreset('relation', {
+           name: 'Relation',
+           tags: {},
+           geometry: ['relation'],
+           matchScore: 0.1
+         });
 
-         return str.substr(0, l - suffLen);
-       }
+         var _this = presetCollection([POINT, LINE, AREA, RELATION]);
 
-       function findClosingBracket(str, b) {
-         if (str.indexOf(b[1]) === -1) {
-           return -1;
-         }
-         const l = str.length;
-         let level = 0,
-           i = 0;
-         for (; i < l; i++) {
-           if (str[i] === '\\') {
-             i++;
-           } else if (str[i] === b[0]) {
-             level++;
-           } else if (str[i] === b[1]) {
-             level--;
-             if (level < 0) {
-               return i;
-             }
-           }
-         }
-         return -1;
-       }
+         var _presets = {
+           point: POINT,
+           line: LINE,
+           area: AREA,
+           relation: RELATION
+         };
+         var _defaults = {
+           point: presetCollection([POINT]),
+           vertex: presetCollection([POINT]),
+           line: presetCollection([LINE]),
+           area: presetCollection([AREA]),
+           relation: presetCollection([RELATION])
+         };
+         var _fields = {};
+         var _categories = {};
+         var _universal = [];
+         var _addablePresetIDs = null; // Set of preset IDs that the user can add
 
-       function checkSanitizeDeprecation(opt) {
-         if (opt && opt.sanitize && !opt.silent) {
-           console.warn('marked(): sanitize and sanitizer parameters are deprecated since version 0.7.0, should not be used and will be removed in the future. Read more here: https://marked.js.org/#/USING_ADVANCED.md#options');
-         }
-       }
+         var _recents;
 
-       var helpers = {
-         escape: escape$1,
-         unescape: unescape$1,
-         edit,
-         cleanUrl,
-         resolveUrl,
-         noopTest,
-         merge: merge$1,
-         splitCells,
-         rtrim,
-         findClosingBracket,
-         checkSanitizeDeprecation
-       };
+         var _favorites; // Index of presets by (geometry, tag key).
 
-       const { defaults: defaults$1 } = defaults;
-       const {
-         rtrim: rtrim$1,
-         splitCells: splitCells$1,
-         escape: escape$2,
-         findClosingBracket: findClosingBracket$1
-       } = helpers;
 
-       function outputLink(cap, link, raw) {
-         const href = link.href;
-         const title = link.title ? escape$2(link.title) : null;
+         var _geometryIndex = {
+           point: {},
+           vertex: {},
+           line: {},
+           area: {},
+           relation: {}
+         };
 
-         if (cap[0].charAt(0) !== '!') {
-           return {
-             type: 'link',
-             raw,
-             href,
-             title,
-             text: cap[1]
-           };
-         } else {
-           return {
-             type: 'image',
-             raw,
-             text: escape$2(cap[1]),
-             href,
-             title
-           };
-         }
-       }
+         var _loadPromise;
 
-       /**
-        * Tokenizer
-        */
-       var Tokenizer_1 = class Tokenizer {
-         constructor(options) {
-           this.options = options || defaults$1;
-         }
+         _this.ensureLoaded = function () {
+           if (_loadPromise) return _loadPromise;
+           return _loadPromise = Promise.all([_mainFileFetcher.get('preset_categories'), _mainFileFetcher.get('preset_defaults'), _mainFileFetcher.get('preset_presets'), _mainFileFetcher.get('preset_fields')]).then(function (vals) {
+             _this.merge({
+               categories: vals[0],
+               defaults: vals[1],
+               presets: vals[2],
+               fields: vals[3]
+             });
 
-         space(src) {
-           const cap = this.rules.block.newline.exec(src);
-           if (cap) {
-             if (cap[0].length > 1) {
-               return {
-                 type: 'space',
-                 raw: cap[0]
-               };
-             }
-             return { raw: '\n' };
-           }
-         }
+             osmSetAreaKeys(_this.areaKeys());
+             osmSetPointTags(_this.pointTags());
+             osmSetVertexTags(_this.vertexTags());
+           });
+         };
 
-         code(src, tokens) {
-           const cap = this.rules.block.code.exec(src);
-           if (cap) {
-             const lastToken = tokens[tokens.length - 1];
-             // An indented code block cannot interrupt a paragraph.
-             if (lastToken && lastToken.type === 'paragraph') {
-               tokens.pop();
-               lastToken.text += '\n' + cap[0].trimRight();
-               lastToken.raw += '\n' + cap[0];
-               return lastToken;
-             } else {
-               const text = cap[0].replace(/^ {4}/gm, '');
-               return {
-                 type: 'code',
-                 raw: cap[0],
-                 codeBlockStyle: 'indented',
-                 text: !this.options.pedantic
-                   ? rtrim$1(text, '\n')
-                   : text
-               };
-             }
-           }
-         }
+         _this.merge = function (d) {
+           // Merge Fields
+           if (d.fields) {
+             Object.keys(d.fields).forEach(function (fieldID) {
+               var f = d.fields[fieldID];
 
-         fences(src) {
-           const cap = this.rules.block.fences.exec(src);
-           if (cap) {
-             return {
-               type: 'code',
-               raw: cap[0],
-               lang: cap[2] ? cap[2].trim() : cap[2],
-               text: cap[3] || ''
-             };
-           }
-         }
+               if (f) {
+                 // add or replace
+                 _fields[fieldID] = presetField(fieldID, f);
+               } else {
+                 // remove
+                 delete _fields[fieldID];
+               }
+             });
+           } // Merge Presets
 
-         heading(src) {
-           const cap = this.rules.block.heading.exec(src);
-           if (cap) {
-             return {
-               type: 'heading',
-               raw: cap[0],
-               depth: cap[1].length,
-               text: cap[2]
-             };
-           }
-         }
 
-         nptable(src) {
-           const cap = this.rules.block.nptable.exec(src);
-           if (cap) {
-             const item = {
-               type: 'table',
-               header: splitCells$1(cap[1].replace(/^ *| *\| *$/g, '')),
-               align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
-               cells: cap[3] ? cap[3].replace(/\n$/, '').split('\n') : [],
-               raw: cap[0]
-             };
+           if (d.presets) {
+             Object.keys(d.presets).forEach(function (presetID) {
+               var p = d.presets[presetID];
 
-             if (item.header.length === item.align.length) {
-               let l = item.align.length;
-               let i;
-               for (i = 0; i < l; i++) {
-                 if (/^ *-+: *$/.test(item.align[i])) {
-                   item.align[i] = 'right';
-                 } else if (/^ *:-+: *$/.test(item.align[i])) {
-                   item.align[i] = 'center';
-                 } else if (/^ *:-+ *$/.test(item.align[i])) {
-                   item.align[i] = 'left';
-                 } else {
-                   item.align[i] = null;
+               if (p) {
+                 // add or replace
+                 var isAddable = !_addablePresetIDs || _addablePresetIDs.has(presetID);
+
+                 _presets[presetID] = presetPreset(presetID, p, isAddable, _fields, _presets);
+               } else {
+                 // remove (but not if it's a fallback)
+                 var existing = _presets[presetID];
+
+                 if (existing && !existing.isFallback()) {
+                   delete _presets[presetID];
                  }
                }
+             });
+           } // Need to rebuild _this.collection before loading categories
+
+
+           _this.collection = Object.values(_presets).concat(Object.values(_categories)); // Merge Categories
 
-               l = item.cells.length;
-               for (i = 0; i < l; i++) {
-                 item.cells[i] = splitCells$1(item.cells[i], item.header.length);
+           if (d.categories) {
+             Object.keys(d.categories).forEach(function (categoryID) {
+               var c = d.categories[categoryID];
+
+               if (c) {
+                 // add or replace
+                 _categories[categoryID] = presetCategory(categoryID, c, _this);
+               } else {
+                 // remove
+                 delete _categories[categoryID];
                }
+             });
+           } // Rebuild _this.collection after loading categories
 
-               return item;
-             }
-           }
-         }
 
-         hr(src) {
-           const cap = this.rules.block.hr.exec(src);
-           if (cap) {
-             return {
-               type: 'hr',
-               raw: cap[0]
-             };
-           }
-         }
+           _this.collection = Object.values(_presets).concat(Object.values(_categories)); // Merge Defaults
 
-         blockquote(src) {
-           const cap = this.rules.block.blockquote.exec(src);
-           if (cap) {
-             const text = cap[0].replace(/^ *> ?/gm, '');
+           if (d.defaults) {
+             Object.keys(d.defaults).forEach(function (geometry) {
+               var def = d.defaults[geometry];
+
+               if (Array.isArray(def)) {
+                 // add or replace
+                 _defaults[geometry] = presetCollection(def.map(function (id) {
+                   return _presets[id] || _categories[id];
+                 }).filter(Boolean));
+               } else {
+                 // remove
+                 delete _defaults[geometry];
+               }
+             });
+           } // Rebuild universal fields array
 
-             return {
-               type: 'blockquote',
-               raw: cap[0],
-               text
-             };
-           }
-         }
 
-         list(src) {
-           const cap = this.rules.block.list.exec(src);
-           if (cap) {
-             let raw = cap[0];
-             const bull = cap[2];
-             const isordered = bull.length > 1;
+           _universal = Object.values(_fields).filter(function (field) {
+             return field.universal;
+           }); // Reset all the preset fields - they'll need to be resolved again
 
-             const list = {
-               type: 'list',
-               raw,
-               ordered: isordered,
-               start: isordered ? +bull : '',
-               loose: false,
-               items: []
-             };
+           Object.values(_presets).forEach(function (preset) {
+             return preset.resetFields();
+           }); // Rebuild geometry index
 
-             // Get each top-level item.
-             const itemMatch = cap[0].match(this.rules.block.item);
-
-             let next = false,
-               item,
-               space,
-               b,
-               addBack,
-               loose,
-               istask,
-               ischecked;
-
-             const l = itemMatch.length;
-             for (let i = 0; i < l; i++) {
-               item = itemMatch[i];
-               raw = item;
-
-               // Remove the list item's bullet
-               // so it is seen as the next token.
-               space = item.length;
-               item = item.replace(/^ *([*+-]|\d+\.) */, '');
-
-               // Outdent whatever the
-               // list item contains. Hacky.
-               if (~item.indexOf('\n ')) {
-                 space -= item.length;
-                 item = !this.options.pedantic
-                   ? item.replace(new RegExp('^ {1,' + space + '}', 'gm'), '')
-                   : item.replace(/^ {1,4}/gm, '');
-               }
-
-               // Determine whether the next list item belongs here.
-               // Backpedal if it does not belong in this list.
-               if (i !== l - 1) {
-                 b = this.rules.block.bullet.exec(itemMatch[i + 1])[0];
-                 if (bull.length > 1 ? b.length === 1
-                   : (b.length > 1 || (this.options.smartLists && b !== bull))) {
-                   addBack = itemMatch.slice(i + 1).join('\n');
-                   list.raw = list.raw.substring(0, list.raw.length - addBack.length);
-                   i = l - 1;
-                 }
-               }
+           _geometryIndex = {
+             point: {},
+             vertex: {},
+             line: {},
+             area: {},
+             relation: {}
+           };
 
-               // Determine whether item is loose or not.
-               // Use: /(^|\n)(?! )[^\n]+\n\n(?!\s*$)/
-               // for discount behavior.
-               loose = next || /\n\n(?!\s*$)/.test(item);
-               if (i !== l - 1) {
-                 next = item.charAt(item.length - 1) === '\n';
-                 if (!loose) loose = next;
-               }
+           _this.collection.forEach(function (preset) {
+             (preset.geometry || []).forEach(function (geometry) {
+               var g = _geometryIndex[geometry];
 
-               if (loose) {
-                 list.loose = true;
+               for (var key in preset.tags) {
+                 (g[key] = g[key] || []).push(preset);
                }
+             });
+           });
 
-               // Check for task list items
-               istask = /^\[[ xX]\] /.test(item);
-               ischecked = undefined;
-               if (istask) {
-                 ischecked = item[1] !== ' ';
-                 item = item.replace(/^\[[ xX]\] +/, '');
-               }
+           return _this;
+         };
 
-               list.items.push({
-                 raw,
-                 task: istask,
-                 checked: ischecked,
-                 loose: loose,
-                 text: item
-               });
+         _this.match = function (entity, resolver) {
+           return resolver["transient"](entity, 'presetMatch', function () {
+             var geometry = entity.geometry(resolver); // Treat entities on addr:interpolation lines as points, not vertices - #3241
+
+             if (geometry === 'vertex' && entity.isOnAddressLine(resolver)) {
+               geometry = 'point';
              }
 
-             return list;
-           }
-         }
+             return _this.matchTags(entity.tags, geometry);
+           });
+         };
 
-         html(src) {
-           const cap = this.rules.block.html.exec(src);
-           if (cap) {
-             return {
-               type: this.options.sanitize
-                 ? 'paragraph'
-                 : 'html',
-               raw: cap[0],
-               pre: !this.options.sanitizer
-                 && (cap[1] === 'pre' || cap[1] === 'script' || cap[1] === 'style'),
-               text: this.options.sanitize ? (this.options.sanitizer ? this.options.sanitizer(cap[0]) : escape$2(cap[0])) : cap[0]
-             };
-           }
-         }
+         _this.matchTags = function (tags, geometry) {
+           var geometryMatches = _geometryIndex[geometry];
+           var address;
+           var best = -1;
+           var match;
 
-         def(src) {
-           const cap = this.rules.block.def.exec(src);
-           if (cap) {
-             if (cap[3]) cap[3] = cap[3].substring(1, cap[3].length - 1);
-             const tag = cap[1].toLowerCase().replace(/\s+/g, ' ');
-             return {
-               tag,
-               raw: cap[0],
-               href: cap[2],
-               title: cap[3]
-             };
-           }
-         }
+           for (var k in tags) {
+             // If any part of an address is present, allow fallback to "Address" preset - #4353
+             if (/^addr:/.test(k) && geometryMatches['addr:*']) {
+               address = geometryMatches['addr:*'][0];
+             }
 
-         table(src) {
-           const cap = this.rules.block.table.exec(src);
-           if (cap) {
-             const item = {
-               type: 'table',
-               header: splitCells$1(cap[1].replace(/^ *| *\| *$/g, '')),
-               align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
-               cells: cap[3] ? cap[3].replace(/\n$/, '').split('\n') : []
-             };
+             var keyMatches = geometryMatches[k];
+             if (!keyMatches) continue;
 
-             if (item.header.length === item.align.length) {
-               item.raw = cap[0];
-
-               let l = item.align.length;
-               let i;
-               for (i = 0; i < l; i++) {
-                 if (/^ *-+: *$/.test(item.align[i])) {
-                   item.align[i] = 'right';
-                 } else if (/^ *:-+: *$/.test(item.align[i])) {
-                   item.align[i] = 'center';
-                 } else if (/^ *:-+ *$/.test(item.align[i])) {
-                   item.align[i] = 'left';
-                 } else {
-                   item.align[i] = null;
-                 }
-               }
+             for (var i = 0; i < keyMatches.length; i++) {
+               var score = keyMatches[i].matchScore(tags);
 
-               l = item.cells.length;
-               for (i = 0; i < l; i++) {
-                 item.cells[i] = splitCells$1(
-                   item.cells[i].replace(/^ *\| *| *\| *$/g, ''),
-                   item.header.length);
+               if (score > best) {
+                 best = score;
+                 match = keyMatches[i];
                }
-
-               return item;
              }
            }
-         }
 
-         lheading(src) {
-           const cap = this.rules.block.lheading.exec(src);
-           if (cap) {
-             return {
-               type: 'heading',
-               raw: cap[0],
-               depth: cap[2].charAt(0) === '=' ? 1 : 2,
-               text: cap[1]
-             };
+           if (address && (!match || match.isFallback())) {
+             match = address;
            }
-         }
 
-         paragraph(src) {
-           const cap = this.rules.block.paragraph.exec(src);
-           if (cap) {
-             return {
-               type: 'paragraph',
-               raw: cap[0],
-               text: cap[1].charAt(cap[1].length - 1) === '\n'
-                 ? cap[1].slice(0, -1)
-                 : cap[1]
-             };
-           }
-         }
+           return match || _this.fallback(geometry);
+         };
 
-         text(src) {
-           const cap = this.rules.block.text.exec(src);
-           if (cap) {
-             return {
-               type: 'text',
-               raw: cap[0],
-               text: cap[0]
-             };
-           }
-         }
+         _this.allowsVertex = function (entity, resolver) {
+           if (entity.type !== 'node') return false;
+           if (Object.keys(entity.tags).length === 0) return true;
+           return resolver["transient"](entity, 'vertexMatch', function () {
+             // address lines allow vertices to act as standalone points
+             if (entity.isOnAddressLine(resolver)) return true;
+             var geometries = osmNodeGeometriesForTags(entity.tags);
+             if (geometries.vertex) return true;
+             if (geometries.point) return false; // allow vertices for unspecified points
 
-         escape(src) {
-           const cap = this.rules.inline.escape.exec(src);
-           if (cap) {
-             return {
-               type: 'escape',
-               raw: cap[0],
-               text: escape$2(cap[1])
-             };
-           }
-         }
+             return true;
+           });
+         }; // Because of the open nature of tagging, iD will never have a complete
+         // list of tags used in OSM, so we want it to have logic like "assume
+         // that a closed way with an amenity tag is an area, unless the amenity
+         // is one of these specific types". This function computes a structure
+         // that allows testing of such conditions, based on the presets designated
+         // as as supporting (or not supporting) the area geometry.
+         //
+         // The returned object L is a keeplist/discardlist of tags. A closed way
+         // with a tag (k, v) is considered to be an area if `k in L && !(v in L[k])`
+         // (see `Way#isArea()`). In other words, the keys of L form the keeplist,
+         // and the subkeys form the discardlist.
 
-         tag(src, inLink, inRawBlock) {
-           const cap = this.rules.inline.tag.exec(src);
-           if (cap) {
-             if (!inLink && /^<a /i.test(cap[0])) {
-               inLink = true;
-             } else if (inLink && /^<\/a>/i.test(cap[0])) {
-               inLink = false;
-             }
-             if (!inRawBlock && /^<(pre|code|kbd|script)(\s|>)/i.test(cap[0])) {
-               inRawBlock = true;
-             } else if (inRawBlock && /^<\/(pre|code|kbd|script)(\s|>)/i.test(cap[0])) {
-               inRawBlock = false;
-             }
 
-             return {
-               type: this.options.sanitize
-                 ? 'text'
-                 : 'html',
-               raw: cap[0],
-               inLink,
-               inRawBlock,
-               text: this.options.sanitize
-                 ? (this.options.sanitizer
-                   ? this.options.sanitizer(cap[0])
-                   : escape$2(cap[0]))
-                 : cap[0]
-             };
-           }
-         }
+         _this.areaKeys = function () {
+           // The ignore list is for keys that imply lines. (We always add `area=yes` for exceptions)
+           var ignore = ['barrier', 'highway', 'footway', 'railway', 'junction', 'type'];
+           var areaKeys = {}; // ignore name-suggestion-index and deprecated presets
+
+           var presets = _this.collection.filter(function (p) {
+             return !p.suggestion && !p.replacement;
+           }); // keeplist
+
+
+           presets.forEach(function (p) {
+             var keys = p.tags && Object.keys(p.tags);
+             var key = keys && keys.length && keys[0]; // pick the first tag
+
+             if (!key) return;
+             if (ignore.indexOf(key) !== -1) return;
 
-         link(src) {
-           const cap = this.rules.inline.link.exec(src);
-           if (cap) {
-             const lastParenIndex = findClosingBracket$1(cap[2], '()');
-             if (lastParenIndex > -1) {
-               const start = cap[0].indexOf('!') === 0 ? 5 : 4;
-               const linkLen = start + cap[1].length + lastParenIndex;
-               cap[2] = cap[2].substring(0, lastParenIndex);
-               cap[0] = cap[0].substring(0, linkLen).trim();
-               cap[3] = '';
+             if (p.geometry.indexOf('area') !== -1) {
+               // probably an area..
+               areaKeys[key] = areaKeys[key] || {};
              }
-             let href = cap[2];
-             let title = '';
-             if (this.options.pedantic) {
-               const link = /^([^'"]*[^\s])\s+(['"])(.*)\2/.exec(href);
+           }); // discardlist
 
-               if (link) {
-                 href = link[1];
-                 title = link[3];
-               } else {
-                 title = '';
+           presets.forEach(function (p) {
+             var key;
+
+             for (key in p.addTags) {
+               // examine all addTags to get a better sense of what can be tagged on lines - #6800
+               var value = p.addTags[key];
+
+               if (key in areaKeys && // probably an area...
+               p.geometry.indexOf('line') !== -1 && // but sometimes a line
+               value !== '*') {
+                 areaKeys[key][value] = true;
                }
-             } else {
-               title = cap[3] ? cap[3].slice(1, -1) : '';
              }
-             href = href.trim().replace(/^<([\s\S]*)>$/, '$1');
-             const token = outputLink(cap, {
-               href: href ? href.replace(this.rules.inline._escapes, '$1') : href,
-               title: title ? title.replace(this.rules.inline._escapes, '$1') : title
-             }, cap[0]);
-             return token;
-           }
-         }
+           });
+           return areaKeys;
+         };
 
-         reflink(src, links) {
-           let cap;
-           if ((cap = this.rules.inline.reflink.exec(src))
-               || (cap = this.rules.inline.nolink.exec(src))) {
-             let link = (cap[2] || cap[1]).replace(/\s+/g, ' ');
-             link = links[link.toLowerCase()];
-             if (!link || !link.href) {
-               const text = cap[0].charAt(0);
-               return {
-                 type: 'text',
-                 raw: text,
-                 text
-               };
+         _this.pointTags = function () {
+           return _this.collection.reduce(function (pointTags, d) {
+             // ignore name-suggestion-index, deprecated, and generic presets
+             if (d.suggestion || d.replacement || d.searchable === false) return pointTags; // only care about the primary tag
+
+             var keys = d.tags && Object.keys(d.tags);
+             var key = keys && keys.length && keys[0]; // pick the first tag
+
+             if (!key) return pointTags; // if this can be a point
+
+             if (d.geometry.indexOf('point') !== -1) {
+               pointTags[key] = pointTags[key] || {};
+               pointTags[key][d.tags[key]] = true;
              }
-             const token = outputLink(cap, link, cap[0]);
-             return token;
-           }
-         }
 
-         strong(src) {
-           const cap = this.rules.inline.strong.exec(src);
-           if (cap) {
-             return {
-               type: 'strong',
-               raw: cap[0],
-               text: cap[4] || cap[3] || cap[2] || cap[1]
-             };
-           }
-         }
+             return pointTags;
+           }, {});
+         };
 
-         em(src) {
-           const cap = this.rules.inline.em.exec(src);
-           if (cap) {
-             return {
-               type: 'em',
-               raw: cap[0],
-               text: cap[6] || cap[5] || cap[4] || cap[3] || cap[2] || cap[1]
-             };
-           }
-         }
+         _this.vertexTags = function () {
+           return _this.collection.reduce(function (vertexTags, d) {
+             // ignore name-suggestion-index, deprecated, and generic presets
+             if (d.suggestion || d.replacement || d.searchable === false) return vertexTags; // only care about the primary tag
 
-         codespan(src) {
-           const cap = this.rules.inline.code.exec(src);
-           if (cap) {
-             return {
-               type: 'codespan',
-               raw: cap[0],
-               text: escape$2(cap[2].trim(), true)
-             };
-           }
-         }
+             var keys = d.tags && Object.keys(d.tags);
+             var key = keys && keys.length && keys[0]; // pick the first tag
 
-         br(src) {
-           const cap = this.rules.inline.br.exec(src);
-           if (cap) {
-             return {
-               type: 'br',
-               raw: cap[0]
-             };
-           }
-         }
+             if (!key) return vertexTags; // if this can be a vertex
 
-         del(src) {
-           const cap = this.rules.inline.del.exec(src);
-           if (cap) {
-             return {
-               type: 'del',
-               raw: cap[0],
-               text: cap[1]
-             };
+             if (d.geometry.indexOf('vertex') !== -1) {
+               vertexTags[key] = vertexTags[key] || {};
+               vertexTags[key][d.tags[key]] = true;
+             }
+
+             return vertexTags;
+           }, {});
+         };
+
+         _this.field = function (id) {
+           return _fields[id];
+         };
+
+         _this.universal = function () {
+           return _universal;
+         };
+
+         _this.defaults = function (geometry, n, startWithRecents) {
+           var recents = [];
+
+           if (startWithRecents) {
+             recents = _this.recent().matchGeometry(geometry).collection.slice(0, 4);
            }
-         }
 
-         autolink(src, mangle) {
-           const cap = this.rules.inline.autolink.exec(src);
-           if (cap) {
-             let text, href;
-             if (cap[2] === '@') {
-               text = escape$2(this.options.mangle ? mangle(cap[1]) : cap[1]);
-               href = 'mailto:' + text;
-             } else {
-               text = escape$2(cap[1]);
-               href = text;
-             }
+           var defaults;
 
-             return {
-               type: 'link',
-               raw: cap[0],
-               text,
-               href,
-               tokens: [
-                 {
-                   type: 'text',
-                   raw: text,
-                   text
-                 }
-               ]
-             };
+           if (_addablePresetIDs) {
+             defaults = Array.from(_addablePresetIDs).map(function (id) {
+               var preset = _this.item(id);
+
+               if (preset && preset.matchGeometry(geometry)) return preset;
+               return null;
+             }).filter(Boolean);
+           } else {
+             defaults = _defaults[geometry].collection.concat(_this.fallback(geometry));
            }
-         }
 
-         url(src, mangle) {
-           let cap;
-           if (cap = this.rules.inline.url.exec(src)) {
-             let text, href;
-             if (cap[2] === '@') {
-               text = escape$2(this.options.mangle ? mangle(cap[0]) : cap[0]);
-               href = 'mailto:' + text;
-             } else {
-               // do extended autolink path validation
-               let prevCapZero;
-               do {
-                 prevCapZero = cap[0];
-                 cap[0] = this.rules.inline._backpedal.exec(cap[0])[0];
-               } while (prevCapZero !== cap[0]);
-               text = escape$2(cap[0]);
-               if (cap[1] === 'www.') {
-                 href = 'http://' + text;
-               } else {
-                 href = text;
-               }
-             }
-             return {
-               type: 'link',
-               raw: cap[0],
-               text,
-               href,
-               tokens: [
-                 {
-                   type: 'text',
-                   raw: text,
-                   text
-                 }
-               ]
-             };
+           return presetCollection(utilArrayUniq(recents.concat(defaults)).slice(0, n - 1));
+         }; // pass a Set of addable preset ids
+
+
+         _this.addablePresetIDs = function (val) {
+           if (!arguments.length) return _addablePresetIDs; // accept and convert arrays
+
+           if (Array.isArray(val)) val = new Set(val);
+           _addablePresetIDs = val;
+
+           if (_addablePresetIDs) {
+             // reset all presets
+             _this.collection.forEach(function (p) {
+               // categories aren't addable
+               if (p.addable) p.addable(_addablePresetIDs.has(p.id));
+             });
+           } else {
+             _this.collection.forEach(function (p) {
+               if (p.addable) p.addable(true);
+             });
            }
-         }
 
-         inlineText(src, inRawBlock, smartypants) {
-           const cap = this.rules.inline.text.exec(src);
-           if (cap) {
-             let text;
-             if (inRawBlock) {
-               text = this.options.sanitize ? (this.options.sanitizer ? this.options.sanitizer(cap[0]) : escape$2(cap[0])) : cap[0];
-             } else {
-               text = escape$2(this.options.smartypants ? smartypants(cap[0]) : cap[0]);
-             }
+           return _this;
+         };
+
+         _this.recent = function () {
+           return presetCollection(utilArrayUniq(_this.getRecents().map(function (d) {
+             return d.preset;
+           })));
+         };
+
+         function RibbonItem(preset, source) {
+           var item = {};
+           item.preset = preset;
+           item.source = source;
+
+           item.isFavorite = function () {
+             return item.source === 'favorite';
+           };
+
+           item.isRecent = function () {
+             return item.source === 'recent';
+           };
+
+           item.matches = function (preset) {
+             return item.preset.id === preset.id;
+           };
+
+           item.minified = function () {
              return {
-               type: 'text',
-               raw: cap[0],
-               text
+               pID: item.preset.id
              };
-           }
+           };
+
+           return item;
          }
-       };
 
-       const {
-         noopTest: noopTest$1,
-         edit: edit$1,
-         merge: merge$2
-       } = helpers;
+         function ribbonItemForMinified(d, source) {
+           if (d && d.pID) {
+             var preset = _this.item(d.pID);
 
-       /**
-        * Block-Level Grammar
-        */
-       const block = {
-         newline: /^\n+/,
-         code: /^( {4}[^\n]+\n*)+/,
-         fences: /^ {0,3}(`{3,}(?=[^`\n]*\n)|~{3,})([^\n]*)\n(?:|([\s\S]*?)\n)(?: {0,3}\1[~`]* *(?:\n+|$)|$)/,
-         hr: /^ {0,3}((?:- *){3,}|(?:_ *){3,}|(?:\* *){3,})(?:\n+|$)/,
-         heading: /^ {0,3}(#{1,6}) +([^\n]*?)(?: +#+)? *(?:\n+|$)/,
-         blockquote: /^( {0,3}> ?(paragraph|[^\n]*)(?:\n|$))+/,
-         list: /^( {0,3})(bull) [\s\S]+?(?:hr|def|\n{2,}(?! )(?!\1bull )\n*|\s*$)/,
-         html: '^ {0,3}(?:' // optional indentation
-           + '<(script|pre|style)[\\s>][\\s\\S]*?(?:</\\1>[^\\n]*\\n+|$)' // (1)
-           + '|comment[^\\n]*(\\n+|$)' // (2)
-           + '|<\\?[\\s\\S]*?\\?>\\n*' // (3)
-           + '|<![A-Z][\\s\\S]*?>\\n*' // (4)
-           + '|<!\\[CDATA\\[[\\s\\S]*?\\]\\]>\\n*' // (5)
-           + '|</?(tag)(?: +|\\n|/?>)[\\s\\S]*?(?:\\n{2,}|$)' // (6)
-           + '|<(?!script|pre|style)([a-z][\\w-]*)(?:attribute)*? */?>(?=[ \\t]*(?:\\n|$))[\\s\\S]*?(?:\\n{2,}|$)' // (7) open tag
-           + '|</(?!script|pre|style)[a-z][\\w-]*\\s*>(?=[ \\t]*(?:\\n|$))[\\s\\S]*?(?:\\n{2,}|$)' // (7) closing tag
-           + ')',
-         def: /^ {0,3}\[(label)\]: *\n? *<?([^\s>]+)>?(?:(?: +\n? *| *\n *)(title))? *(?:\n+|$)/,
-         nptable: noopTest$1,
-         table: noopTest$1,
-         lheading: /^([^\n]+)\n {0,3}(=+|-+) *(?:\n+|$)/,
-         // regex template, placeholders will be replaced according to different paragraph
-         // interruption rules of commonmark and the original markdown spec:
-         _paragraph: /^([^\n]+(?:\n(?!hr|heading|lheading|blockquote|fences|list|html)[^\n]+)*)/,
-         text: /^[^\n]+/
-       };
+             if (!preset) return null;
+             return RibbonItem(preset, source);
+           }
 
-       block._label = /(?!\s*\])(?:\\[\[\]]|[^\[\]])+/;
-       block._title = /(?:"(?:\\"?|[^"\\])*"|'[^'\n]*(?:\n[^'\n]+)*\n?'|\([^()]*\))/;
-       block.def = edit$1(block.def)
-         .replace('label', block._label)
-         .replace('title', block._title)
-         .getRegex();
+           return null;
+         }
 
-       block.bullet = /(?:[*+-]|\d{1,9}\.)/;
-       block.item = /^( *)(bull) ?[^\n]*(?:\n(?!\1bull ?)[^\n]*)*/;
-       block.item = edit$1(block.item, 'gm')
-         .replace(/bull/g, block.bullet)
-         .getRegex();
-
-       block.list = edit$1(block.list)
-         .replace(/bull/g, block.bullet)
-         .replace('hr', '\\n+(?=\\1?(?:(?:- *){3,}|(?:_ *){3,}|(?:\\* *){3,})(?:\\n+|$))')
-         .replace('def', '\\n+(?=' + block.def.source + ')')
-         .getRegex();
-
-       block._tag = 'address|article|aside|base|basefont|blockquote|body|caption'
-         + '|center|col|colgroup|dd|details|dialog|dir|div|dl|dt|fieldset|figcaption'
-         + '|figure|footer|form|frame|frameset|h[1-6]|head|header|hr|html|iframe'
-         + '|legend|li|link|main|menu|menuitem|meta|nav|noframes|ol|optgroup|option'
-         + '|p|param|section|source|summary|table|tbody|td|tfoot|th|thead|title|tr'
-         + '|track|ul';
-       block._comment = /<!--(?!-?>)[\s\S]*?-->/;
-       block.html = edit$1(block.html, 'i')
-         .replace('comment', block._comment)
-         .replace('tag', block._tag)
-         .replace('attribute', / +[a-zA-Z:_][\w.:-]*(?: *= *"[^"\n]*"| *= *'[^'\n]*'| *= *[^\s"'=<>`]+)?/)
-         .getRegex();
-
-       block.paragraph = edit$1(block._paragraph)
-         .replace('hr', block.hr)
-         .replace('heading', ' {0,3}#{1,6} ')
-         .replace('|lheading', '') // setex headings don't interrupt commonmark paragraphs
-         .replace('blockquote', ' {0,3}>')
-         .replace('fences', ' {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n')
-         .replace('list', ' {0,3}(?:[*+-]|1[.)]) ') // only lists starting from 1 can interrupt
-         .replace('html', '</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|!--)')
-         .replace('tag', block._tag) // pars can be interrupted by type (6) html blocks
-         .getRegex();
-
-       block.blockquote = edit$1(block.blockquote)
-         .replace('paragraph', block.paragraph)
-         .getRegex();
+         _this.getGenericRibbonItems = function () {
+           return ['point', 'line', 'area'].map(function (id) {
+             return RibbonItem(_this.item(id), 'generic');
+           });
+         };
 
-       /**
-        * Normal Block Grammar
-        */
+         _this.getAddable = function () {
+           if (!_addablePresetIDs) return [];
+           return _addablePresetIDs.map(function (id) {
+             var preset = _this.item(id);
 
-       block.normal = merge$2({}, block);
+             if (preset) return RibbonItem(preset, 'addable');
+             return null;
+           }).filter(Boolean);
+         };
 
-       /**
-        * GFM Block Grammar
-        */
+         function setRecents(items) {
+           _recents = items;
+           var minifiedItems = items.map(function (d) {
+             return d.minified();
+           });
+           corePreferences('preset_recents', JSON.stringify(minifiedItems));
+           dispatch$1.call('recentsChange');
+         }
 
-       block.gfm = merge$2({}, block.normal, {
-         nptable: '^ *([^|\\n ].*\\|.*)\\n' // Header
-           + ' *([-:]+ *\\|[-| :]*)' // Align
-           + '(?:\\n((?:(?!\\n|hr|heading|blockquote|code|fences|list|html).*(?:\\n|$))*)\\n*|$)', // Cells
-         table: '^ *\\|(.+)\\n' // Header
-           + ' *\\|?( *[-:]+[-| :]*)' // Align
-           + '(?:\\n *((?:(?!\\n|hr|heading|blockquote|code|fences|list|html).*(?:\\n|$))*)\\n*|$)' // Cells
-       });
+         _this.getRecents = function () {
+           if (!_recents) {
+             // fetch from local storage
+             _recents = (JSON.parse(corePreferences('preset_recents')) || []).reduce(function (acc, d) {
+               var item = ribbonItemForMinified(d, 'recent');
+               if (item && item.preset.addable()) acc.push(item);
+               return acc;
+             }, []);
+           }
 
-       block.gfm.nptable = edit$1(block.gfm.nptable)
-         .replace('hr', block.hr)
-         .replace('heading', ' {0,3}#{1,6} ')
-         .replace('blockquote', ' {0,3}>')
-         .replace('code', ' {4}[^\\n]')
-         .replace('fences', ' {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n')
-         .replace('list', ' {0,3}(?:[*+-]|1[.)]) ') // only lists starting from 1 can interrupt
-         .replace('html', '</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|!--)')
-         .replace('tag', block._tag) // tables can be interrupted by type (6) html blocks
-         .getRegex();
-
-       block.gfm.table = edit$1(block.gfm.table)
-         .replace('hr', block.hr)
-         .replace('heading', ' {0,3}#{1,6} ')
-         .replace('blockquote', ' {0,3}>')
-         .replace('code', ' {4}[^\\n]')
-         .replace('fences', ' {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n')
-         .replace('list', ' {0,3}(?:[*+-]|1[.)]) ') // only lists starting from 1 can interrupt
-         .replace('html', '</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|!--)')
-         .replace('tag', block._tag) // tables can be interrupted by type (6) html blocks
-         .getRegex();
+           return _recents;
+         };
 
-       /**
-        * Pedantic grammar (original John Gruber's loose markdown specification)
-        */
+         _this.addRecent = function (preset, besidePreset, after) {
+           var recents = _this.getRecents();
 
-       block.pedantic = merge$2({}, block.normal, {
-         html: edit$1(
-           '^ *(?:comment *(?:\\n|\\s*$)'
-           + '|<(tag)[\\s\\S]+?</\\1> *(?:\\n{2,}|\\s*$)' // closed tag
-           + '|<tag(?:"[^"]*"|\'[^\']*\'|\\s[^\'"/>\\s]*)*?/?> *(?:\\n{2,}|\\s*$))')
-           .replace('comment', block._comment)
-           .replace(/tag/g, '(?!(?:'
-             + 'a|em|strong|small|s|cite|q|dfn|abbr|data|time|code|var|samp|kbd|sub'
-             + '|sup|i|b|u|mark|ruby|rt|rp|bdi|bdo|span|br|wbr|ins|del|img)'
-             + '\\b)\\w+(?!:|[^\\w\\s@]*@)\\b')
-           .getRegex(),
-         def: /^ *\[([^\]]+)\]: *<?([^\s>]+)>?(?: +(["(][^\n]+[")]))? *(?:\n+|$)/,
-         heading: /^ *(#{1,6}) *([^\n]+?) *(?:#+ *)?(?:\n+|$)/,
-         fences: noopTest$1, // fences not supported
-         paragraph: edit$1(block.normal._paragraph)
-           .replace('hr', block.hr)
-           .replace('heading', ' *#{1,6} *[^\n]')
-           .replace('lheading', block.lheading)
-           .replace('blockquote', ' {0,3}>')
-           .replace('|fences', '')
-           .replace('|list', '')
-           .replace('|html', '')
-           .getRegex()
-       });
+           var beforeItem = _this.recentMatching(besidePreset);
 
-       /**
-        * Inline-Level Grammar
-        */
-       const inline = {
-         escape: /^\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/,
-         autolink: /^<(scheme:[^\s\x00-\x1f<>]*|email)>/,
-         url: noopTest$1,
-         tag: '^comment'
-           + '|^</[a-zA-Z][\\w:-]*\\s*>' // self-closing tag
-           + '|^<[a-zA-Z][\\w-]*(?:attribute)*?\\s*/?>' // open tag
-           + '|^<\\?[\\s\\S]*?\\?>' // processing instruction, e.g. <?php ?>
-           + '|^<![a-zA-Z]+\\s[\\s\\S]*?>' // declaration, e.g. <!DOCTYPE html>
-           + '|^<!\\[CDATA\\[[\\s\\S]*?\\]\\]>', // CDATA section
-         link: /^!?\[(label)\]\(\s*(href)(?:\s+(title))?\s*\)/,
-         reflink: /^!?\[(label)\]\[(?!\s*\])((?:\\[\[\]]?|[^\[\]\\])+)\]/,
-         nolink: /^!?\[(?!\s*\])((?:\[[^\[\]]*\]|\\[\[\]]|[^\[\]])*)\](?:\[\])?/,
-         strong: /^__([^\s_])__(?!_)|^\*\*([^\s*])\*\*(?!\*)|^__([^\s][\s\S]*?[^\s])__(?!_)|^\*\*([^\s][\s\S]*?[^\s])\*\*(?!\*)/,
-         em: /^_([^\s_])_(?!_)|^_([^\s_<][\s\S]*?[^\s_])_(?!_|[^\spunctuation])|^_([^\s_<][\s\S]*?[^\s])_(?!_|[^\spunctuation])|^\*([^\s*<\[])\*(?!\*)|^\*([^\s<"][\s\S]*?[^\s\[\*])\*(?![\]`punctuation])|^\*([^\s*"<\[][\s\S]*[^\s])\*(?!\*)/,
-         code: /^(`+)([^`]|[^`][\s\S]*?[^`])\1(?!`)/,
-         br: /^( {2,}|\\)\n(?!\s*$)/,
-         del: noopTest$1,
-         text: /^(`+|[^`])(?:[\s\S]*?(?:(?=[\\<!\[`*]|\b_|$)|[^ ](?= {2,}\n))|(?= {2,}\n))/
-       };
+           var toIndex = recents.indexOf(beforeItem);
+           if (after) toIndex += 1;
+           var newItem = RibbonItem(preset, 'recent');
+           recents.splice(toIndex, 0, newItem);
+           setRecents(recents);
+         };
 
-       // list of punctuation marks from common mark spec
-       // without ` and ] to workaround Rule 17 (inline code blocks/links)
-       inline._punctuation = '!"#$%&\'()*+\\-./:;<=>?@\\[^_{|}~';
-       inline.em = edit$1(inline.em).replace(/punctuation/g, inline._punctuation).getRegex();
+         _this.removeRecent = function (preset) {
+           var item = _this.recentMatching(preset);
 
-       inline._escapes = /\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/g;
+           if (item) {
+             var items = _this.getRecents();
 
-       inline._scheme = /[a-zA-Z][a-zA-Z0-9+.-]{1,31}/;
-       inline._email = /[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+(@)[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)+(?![-_])/;
-       inline.autolink = edit$1(inline.autolink)
-         .replace('scheme', inline._scheme)
-         .replace('email', inline._email)
-         .getRegex();
+             items.splice(items.indexOf(item), 1);
+             setRecents(items);
+           }
+         };
 
-       inline._attribute = /\s+[a-zA-Z:_][\w.:-]*(?:\s*=\s*"[^"]*"|\s*=\s*'[^']*'|\s*=\s*[^\s"'=<>`]+)?/;
+         _this.recentMatching = function (preset) {
+           var items = _this.getRecents();
 
-       inline.tag = edit$1(inline.tag)
-         .replace('comment', block._comment)
-         .replace('attribute', inline._attribute)
-         .getRegex();
+           for (var i in items) {
+             if (items[i].matches(preset)) {
+               return items[i];
+             }
+           }
 
-       inline._label = /(?:\[[^\[\]]*\]|\\.|`[^`]*`|[^\[\]\\`])*?/;
-       inline._href = /<(?:\\[<>]?|[^\s<>\\])*>|[^\s\x00-\x1f]*/;
-       inline._title = /"(?:\\"?|[^"\\])*"|'(?:\\'?|[^'\\])*'|\((?:\\\)?|[^)\\])*\)/;
+           return null;
+         };
 
-       inline.link = edit$1(inline.link)
-         .replace('label', inline._label)
-         .replace('href', inline._href)
-         .replace('title', inline._title)
-         .getRegex();
+         _this.moveItem = function (items, fromIndex, toIndex) {
+           if (fromIndex === toIndex || fromIndex < 0 || toIndex < 0 || fromIndex >= items.length || toIndex >= items.length) return null;
+           items.splice(toIndex, 0, items.splice(fromIndex, 1)[0]);
+           return items;
+         };
 
-       inline.reflink = edit$1(inline.reflink)
-         .replace('label', inline._label)
-         .getRegex();
+         _this.moveRecent = function (item, beforeItem) {
+           var recents = _this.getRecents();
 
-       /**
-        * Normal Inline Grammar
-        */
+           var fromIndex = recents.indexOf(item);
+           var toIndex = recents.indexOf(beforeItem);
 
-       inline.normal = merge$2({}, inline);
+           var items = _this.moveItem(recents, fromIndex, toIndex);
 
-       /**
-        * Pedantic Inline Grammar
-        */
+           if (items) setRecents(items);
+         };
 
-       inline.pedantic = merge$2({}, inline.normal, {
-         strong: /^__(?=\S)([\s\S]*?\S)__(?!_)|^\*\*(?=\S)([\s\S]*?\S)\*\*(?!\*)/,
-         em: /^_(?=\S)([\s\S]*?\S)_(?!_)|^\*(?=\S)([\s\S]*?\S)\*(?!\*)/,
-         link: edit$1(/^!?\[(label)\]\((.*?)\)/)
-           .replace('label', inline._label)
-           .getRegex(),
-         reflink: edit$1(/^!?\[(label)\]\s*\[([^\]]*)\]/)
-           .replace('label', inline._label)
-           .getRegex()
-       });
+         _this.setMostRecent = function (preset) {
+           if (preset.searchable === false) return;
 
-       /**
-        * GFM Inline Grammar
-        */
+           var items = _this.getRecents();
 
-       inline.gfm = merge$2({}, inline.normal, {
-         escape: edit$1(inline.escape).replace('])', '~|])').getRegex(),
-         _extended_email: /[A-Za-z0-9._+-]+(@)[a-zA-Z0-9-_]+(?:\.[a-zA-Z0-9-_]*[a-zA-Z0-9])+(?![-_])/,
-         url: /^((?:ftp|https?):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/,
-         _backpedal: /(?:[^?!.,:;*_~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_~)]+(?!$))+/,
-         del: /^~+(?=\S)([\s\S]*?\S)~+/,
-         text: /^(`+|[^`])(?:[\s\S]*?(?:(?=[\\<!\[`*~]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))|(?= {2,}\n|[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))/
-       });
+           var item = _this.recentMatching(preset);
 
-       inline.gfm.url = edit$1(inline.gfm.url, 'i')
-         .replace('email', inline.gfm._extended_email)
-         .getRegex();
-       /**
-        * GFM + Line Breaks Inline Grammar
-        */
+           if (item) {
+             items.splice(items.indexOf(item), 1);
+           } else {
+             item = RibbonItem(preset, 'recent');
+           } // remove the last recent (first in, first out)
 
-       inline.breaks = merge$2({}, inline.gfm, {
-         br: edit$1(inline.br).replace('{2,}', '*').getRegex(),
-         text: edit$1(inline.gfm.text)
-           .replace('\\b_', '\\b_| {2,}\\n')
-           .replace(/\{2,\}/g, '*')
-           .getRegex()
-       });
 
-       var rules = {
-         block,
-         inline
-       };
+           while (items.length >= MAXRECENTS) {
+             items.pop();
+           } // prepend array
 
-       const { defaults: defaults$2 } = defaults;
-       const { block: block$1, inline: inline$1 } = rules;
 
-       /**
-        * smartypants text replacement
-        */
-       function smartypants(text) {
-         return text
-           // em-dashes
-           .replace(/---/g, '\u2014')
-           // en-dashes
-           .replace(/--/g, '\u2013')
-           // opening singles
-           .replace(/(^|[-\u2014/(\[{"\s])'/g, '$1\u2018')
-           // closing singles & apostrophes
-           .replace(/'/g, '\u2019')
-           // opening doubles
-           .replace(/(^|[-\u2014/(\[{\u2018\s])"/g, '$1\u201c')
-           // closing doubles
-           .replace(/"/g, '\u201d')
-           // ellipses
-           .replace(/\.{3}/g, '\u2026');
-       }
+           items.unshift(item);
+           setRecents(items);
+         };
 
-       /**
-        * mangle email addresses
-        */
-       function mangle(text) {
-         let out = '',
-           i,
-           ch;
+         function setFavorites(items) {
+           _favorites = items;
+           var minifiedItems = items.map(function (d) {
+             return d.minified();
+           });
+           corePreferences('preset_favorites', JSON.stringify(minifiedItems)); // call update
 
-         const l = text.length;
-         for (i = 0; i < l; i++) {
-           ch = text.charCodeAt(i);
-           if (Math.random() > 0.5) {
-             ch = 'x' + ch.toString(16);
-           }
-           out += '&#' + ch + ';';
+           dispatch$1.call('favoritePreset');
          }
 
-         return out;
-       }
+         _this.addFavorite = function (preset, besidePreset, after) {
+           var favorites = _this.getFavorites();
 
-       /**
-        * Block Lexer
-        */
-       var Lexer_1 = class Lexer {
-         constructor(options) {
-           this.tokens = [];
-           this.tokens.links = Object.create(null);
-           this.options = options || defaults$2;
-           this.options.tokenizer = this.options.tokenizer || new Tokenizer_1();
-           this.tokenizer = this.options.tokenizer;
-           this.tokenizer.options = this.options;
+           var beforeItem = _this.favoriteMatching(besidePreset);
 
-           const rules = {
-             block: block$1.normal,
-             inline: inline$1.normal
-           };
+           var toIndex = favorites.indexOf(beforeItem);
+           if (after) toIndex += 1;
+           var newItem = RibbonItem(preset, 'favorite');
+           favorites.splice(toIndex, 0, newItem);
+           setFavorites(favorites);
+         };
 
-           if (this.options.pedantic) {
-             rules.block = block$1.pedantic;
-             rules.inline = inline$1.pedantic;
-           } else if (this.options.gfm) {
-             rules.block = block$1.gfm;
-             if (this.options.breaks) {
-               rules.inline = inline$1.breaks;
-             } else {
-               rules.inline = inline$1.gfm;
-             }
-           }
-           this.tokenizer.rules = rules;
-         }
+         _this.toggleFavorite = function (preset) {
+           var favs = _this.getFavorites();
 
-         /**
-          * Expose Rules
-          */
-         static get rules() {
-           return {
-             block: block$1,
-             inline: inline$1
-           };
-         }
+           var favorite = _this.favoriteMatching(preset);
 
-         /**
-          * Static Lex Method
-          */
-         static lex(src, options) {
-           const lexer = new Lexer(options);
-           return lexer.lex(src);
-         }
+           if (favorite) {
+             favs.splice(favs.indexOf(favorite), 1);
+           } else {
+             // only allow 10 favorites
+             if (favs.length === 10) {
+               // remove the last favorite (last in, first out)
+               favs.pop();
+             } // append array
 
-         /**
-          * Preprocessing
-          */
-         lex(src) {
-           src = src
-             .replace(/\r\n|\r/g, '\n')
-             .replace(/\t/g, '    ');
 
-           this.blockTokens(src, this.tokens, true);
+             favs.push(RibbonItem(preset, 'favorite'));
+           }
 
-           this.inline(this.tokens);
+           setFavorites(favs);
+         };
 
-           return this.tokens;
-         }
+         _this.removeFavorite = function (preset) {
+           var item = _this.favoriteMatching(preset);
 
-         /**
-          * Lexing
-          */
-         blockTokens(src, tokens = [], top = true) {
-           src = src.replace(/^ +$/gm, '');
-           let token, i, l;
-
-           while (src) {
-             // newline
-             if (token = this.tokenizer.space(src)) {
-               src = src.substring(token.raw.length);
-               if (token.type) {
-                 tokens.push(token);
-               }
-               continue;
-             }
+           if (item) {
+             var items = _this.getFavorites();
 
-             // code
-             if (token = this.tokenizer.code(src, tokens)) {
-               src = src.substring(token.raw.length);
-               tokens.push(token);
-               continue;
-             }
+             items.splice(items.indexOf(item), 1);
+             setFavorites(items);
+           }
+         };
 
-             // fences
-             if (token = this.tokenizer.fences(src)) {
-               src = src.substring(token.raw.length);
-               tokens.push(token);
-               continue;
-             }
+         _this.getFavorites = function () {
+           if (!_favorites) {
+             // fetch from local storage
+             var rawFavorites = JSON.parse(corePreferences('preset_favorites'));
 
-             // heading
-             if (token = this.tokenizer.heading(src)) {
-               src = src.substring(token.raw.length);
-               tokens.push(token);
-               continue;
+             if (!rawFavorites) {
+               rawFavorites = [];
+               corePreferences('preset_favorites', JSON.stringify(rawFavorites));
              }
 
-             // table no leading pipe (gfm)
-             if (token = this.tokenizer.nptable(src)) {
-               src = src.substring(token.raw.length);
-               tokens.push(token);
-               continue;
-             }
+             _favorites = rawFavorites.reduce(function (output, d) {
+               var item = ribbonItemForMinified(d, 'favorite');
+               if (item && item.preset.addable()) output.push(item);
+               return output;
+             }, []);
+           }
 
-             // hr
-             if (token = this.tokenizer.hr(src)) {
-               src = src.substring(token.raw.length);
-               tokens.push(token);
-               continue;
-             }
+           return _favorites;
+         };
 
-             // blockquote
-             if (token = this.tokenizer.blockquote(src)) {
-               src = src.substring(token.raw.length);
-               token.tokens = this.blockTokens(token.text, [], top);
-               tokens.push(token);
-               continue;
-             }
+         _this.favoriteMatching = function (preset) {
+           var favs = _this.getFavorites();
 
-             // list
-             if (token = this.tokenizer.list(src)) {
-               src = src.substring(token.raw.length);
-               l = token.items.length;
-               for (i = 0; i < l; i++) {
-                 token.items[i].tokens = this.blockTokens(token.items[i].text, [], false);
-               }
-               tokens.push(token);
-               continue;
+           for (var index in favs) {
+             if (favs[index].matches(preset)) {
+               return favs[index];
              }
+           }
 
-             // html
-             if (token = this.tokenizer.html(src)) {
-               src = src.substring(token.raw.length);
-               tokens.push(token);
-               continue;
-             }
+           return null;
+         };
 
-             // def
-             if (top && (token = this.tokenizer.def(src))) {
-               src = src.substring(token.raw.length);
-               if (!this.tokens.links[token.tag]) {
-                 this.tokens.links[token.tag] = {
-                   href: token.href,
-                   title: token.title
-                 };
-               }
-               continue;
-             }
+         return utilRebind(_this, dispatch$1, 'on');
+       }
 
-             // table (gfm)
-             if (token = this.tokenizer.table(src)) {
-               src = src.substring(token.raw.length);
-               tokens.push(token);
-               continue;
-             }
+       function utilTagText(entity) {
+         var obj = entity && entity.tags || {};
+         return Object.keys(obj).map(function (k) {
+           return k + '=' + obj[k];
+         }).join(', ');
+       }
+       function utilTotalExtent(array, graph) {
+         var extent = geoExtent();
+         var val, entity;
 
-             // lheading
-             if (token = this.tokenizer.lheading(src)) {
-               src = src.substring(token.raw.length);
-               tokens.push(token);
-               continue;
-             }
+         for (var i = 0; i < array.length; i++) {
+           val = array[i];
+           entity = typeof val === 'string' ? graph.hasEntity(val) : val;
 
-             // top-level paragraph
-             if (top && (token = this.tokenizer.paragraph(src))) {
-               src = src.substring(token.raw.length);
-               tokens.push(token);
-               continue;
-             }
+           if (entity) {
+             extent._extend(entity.extent(graph));
+           }
+         }
 
-             // text
-             if (token = this.tokenizer.text(src)) {
-               src = src.substring(token.raw.length);
-               tokens.push(token);
-               continue;
-             }
+         return extent;
+       }
+       function utilTagDiff(oldTags, newTags) {
+         var tagDiff = [];
+         var keys = utilArrayUnion(Object.keys(oldTags), Object.keys(newTags)).sort();
+         keys.forEach(function (k) {
+           var oldVal = oldTags[k];
+           var newVal = newTags[k];
+
+           if ((oldVal || oldVal === '') && (newVal === undefined || newVal !== oldVal)) {
+             tagDiff.push({
+               type: '-',
+               key: k,
+               oldVal: oldVal,
+               newVal: newVal,
+               display: '- ' + k + '=' + oldVal
+             });
+           }
 
-             if (src) {
-               const errMsg = 'Infinite loop on byte: ' + src.charCodeAt(0);
-               if (this.options.silent) {
-                 console.error(errMsg);
-                 break;
-               } else {
-                 throw new Error(errMsg);
-               }
-             }
+           if ((newVal || newVal === '') && (oldVal === undefined || newVal !== oldVal)) {
+             tagDiff.push({
+               type: '+',
+               key: k,
+               oldVal: oldVal,
+               newVal: newVal,
+               display: '+ ' + k + '=' + newVal
+             });
            }
+         });
+         return tagDiff;
+       }
+       function utilEntitySelector(ids) {
+         return ids.length ? '.' + ids.join(',.') : 'nothing';
+       } // returns an selector to select entity ids for:
+       //  - entityIDs passed in
+       //  - shallow descendant entityIDs for any of those entities that are relations
 
-           return tokens;
+       function utilEntityOrMemberSelector(ids, graph) {
+         var seen = new Set(ids);
+         ids.forEach(collectShallowDescendants);
+         return utilEntitySelector(Array.from(seen));
+
+         function collectShallowDescendants(id) {
+           var entity = graph.hasEntity(id);
+           if (!entity || entity.type !== 'relation') return;
+           entity.members.map(function (member) {
+             return member.id;
+           }).forEach(function (id) {
+             seen.add(id);
+           });
          }
+       } // returns an selector to select entity ids for:
+       //  - entityIDs passed in
+       //  - deep descendant entityIDs for any of those entities that are relations
 
-         inline(tokens) {
-           let i,
-             j,
-             k,
-             l2,
-             row,
-             token;
+       function utilEntityOrDeepMemberSelector(ids, graph) {
+         return utilEntitySelector(utilEntityAndDeepMemberIDs(ids, graph));
+       } // returns an selector to select entity ids for:
+       //  - entityIDs passed in
+       //  - deep descendant entityIDs for any of those entities that are relations
 
-           const l = tokens.length;
-           for (i = 0; i < l; i++) {
-             token = tokens[i];
-             switch (token.type) {
-               case 'paragraph':
-               case 'text':
-               case 'heading': {
-                 token.tokens = [];
-                 this.inlineTokens(token.text, token.tokens);
-                 break;
-               }
-               case 'table': {
-                 token.tokens = {
-                   header: [],
-                   cells: []
-                 };
+       function utilEntityAndDeepMemberIDs(ids, graph) {
+         var seen = new Set();
+         ids.forEach(collectDeepDescendants);
+         return Array.from(seen);
+
+         function collectDeepDescendants(id) {
+           if (seen.has(id)) return;
+           seen.add(id);
+           var entity = graph.hasEntity(id);
+           if (!entity || entity.type !== 'relation') return;
+           entity.members.map(function (member) {
+             return member.id;
+           }).forEach(collectDeepDescendants); // recurse
+         }
+       } // returns an selector to select entity ids for:
+       //  - deep descendant entityIDs for any of those entities that are relations
 
-                 // header
-                 l2 = token.header.length;
-                 for (j = 0; j < l2; j++) {
-                   token.tokens.header[j] = [];
-                   this.inlineTokens(token.header[j], token.tokens.header[j]);
-                 }
+       function utilDeepMemberSelector(ids, graph, skipMultipolgonMembers) {
+         var idsSet = new Set(ids);
+         var seen = new Set();
+         var returners = new Set();
+         ids.forEach(collectDeepDescendants);
+         return utilEntitySelector(Array.from(returners));
 
-                 // cells
-                 l2 = token.cells.length;
-                 for (j = 0; j < l2; j++) {
-                   row = token.cells[j];
-                   token.tokens.cells[j] = [];
-                   for (k = 0; k < row.length; k++) {
-                     token.tokens.cells[j][k] = [];
-                     this.inlineTokens(row[k], token.tokens.cells[j][k]);
-                   }
-                 }
+         function collectDeepDescendants(id) {
+           if (seen.has(id)) return;
+           seen.add(id);
 
-                 break;
-               }
-               case 'blockquote': {
-                 this.inline(token.tokens);
-                 break;
-               }
-               case 'list': {
-                 l2 = token.items.length;
-                 for (j = 0; j < l2; j++) {
-                   this.inline(token.items[j].tokens);
-                 }
-                 break;
-               }
-             }
+           if (!idsSet.has(id)) {
+             returners.add(id);
            }
 
-           return tokens;
+           var entity = graph.hasEntity(id);
+           if (!entity || entity.type !== 'relation') return;
+           if (skipMultipolgonMembers && entity.isMultipolygon()) return;
+           entity.members.map(function (member) {
+             return member.id;
+           }).forEach(collectDeepDescendants); // recurse
          }
+       } // Adds or removes highlight styling for the specified entities
 
-         /**
-          * Lexing/Compiling
-          */
-         inlineTokens(src, tokens = [], inLink = false, inRawBlock = false) {
-           let token;
-
-           while (src) {
-             // escape
-             if (token = this.tokenizer.escape(src)) {
-               src = src.substring(token.raw.length);
-               tokens.push(token);
-               continue;
-             }
+       function utilHighlightEntities(ids, highlighted, context) {
+         context.surface().selectAll(utilEntityOrDeepMemberSelector(ids, context.graph())).classed('highlighted', highlighted);
+       } // returns an Array that is the union of:
+       //  - nodes for any nodeIDs passed in
+       //  - child nodes of any wayIDs passed in
+       //  - descendant member and child nodes of relationIDs passed in
 
-             // tag
-             if (token = this.tokenizer.tag(src, inLink, inRawBlock)) {
-               src = src.substring(token.raw.length);
-               inLink = token.inLink;
-               inRawBlock = token.inRawBlock;
-               tokens.push(token);
-               continue;
-             }
+       function utilGetAllNodes(ids, graph) {
+         var seen = new Set();
+         var nodes = new Set();
+         ids.forEach(collectNodes);
+         return Array.from(nodes);
+
+         function collectNodes(id) {
+           if (seen.has(id)) return;
+           seen.add(id);
+           var entity = graph.hasEntity(id);
+           if (!entity) return;
+
+           if (entity.type === 'node') {
+             nodes.add(entity);
+           } else if (entity.type === 'way') {
+             entity.nodes.forEach(collectNodes);
+           } else {
+             entity.members.map(function (member) {
+               return member.id;
+             }).forEach(collectNodes); // recurse
+           }
+         }
+       }
+       function utilDisplayName(entity) {
+         var localizedNameKey = 'name:' + _mainLocalizer.languageCode().toLowerCase();
+         var name = entity.tags[localizedNameKey] || entity.tags.name || '';
+         var network = entity.tags.cycle_network || entity.tags.network;
 
-             // link
-             if (token = this.tokenizer.link(src)) {
-               src = src.substring(token.raw.length);
-               if (token.type === 'link') {
-                 token.tokens = this.inlineTokens(token.text, [], true, inRawBlock);
-               }
-               tokens.push(token);
-               continue;
-             }
+         if (!name && entity.tags.ref) {
+           name = entity.tags.ref;
 
-             // reflink, nolink
-             if (token = this.tokenizer.reflink(src, this.tokens.links)) {
-               src = src.substring(token.raw.length);
-               if (token.type === 'link') {
-                 token.tokens = this.inlineTokens(token.text, [], true, inRawBlock);
-               }
-               tokens.push(token);
-               continue;
-             }
+           if (network) {
+             name = network + ' ' + name;
+           }
+         }
 
-             // strong
-             if (token = this.tokenizer.strong(src)) {
-               src = src.substring(token.raw.length);
-               token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
-               tokens.push(token);
-               continue;
-             }
+         return name;
+       }
+       function utilDisplayNameForPath(entity) {
+         var name = utilDisplayName(entity);
+         var isFirefox = utilDetect().browser.toLowerCase().indexOf('firefox') > -1;
 
-             // em
-             if (token = this.tokenizer.em(src)) {
-               src = src.substring(token.raw.length);
-               token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
-               tokens.push(token);
-               continue;
-             }
+         if (!isFirefox && name && rtlRegex.test(name)) {
+           name = fixRTLTextForSvg(name);
+         }
 
-             // code
-             if (token = this.tokenizer.codespan(src)) {
-               src = src.substring(token.raw.length);
-               tokens.push(token);
-               continue;
-             }
+         return name;
+       }
+       function utilDisplayType(id) {
+         return {
+           n: _t('inspector.node'),
+           w: _t('inspector.way'),
+           r: _t('inspector.relation')
+         }[id.charAt(0)];
+       }
+       function utilDisplayLabel(entity, graphOrGeometry) {
+         var displayName = utilDisplayName(entity);
 
-             // br
-             if (token = this.tokenizer.br(src)) {
-               src = src.substring(token.raw.length);
-               tokens.push(token);
-               continue;
-             }
+         if (displayName) {
+           // use the display name if there is one
+           return displayName;
+         }
 
-             // del (gfm)
-             if (token = this.tokenizer.del(src)) {
-               src = src.substring(token.raw.length);
-               token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
-               tokens.push(token);
-               continue;
-             }
+         var preset = typeof graphOrGeometry === 'string' ? _mainPresetIndex.matchTags(entity.tags, graphOrGeometry) : _mainPresetIndex.match(entity, graphOrGeometry);
 
-             // autolink
-             if (token = this.tokenizer.autolink(src, mangle)) {
-               src = src.substring(token.raw.length);
-               tokens.push(token);
-               continue;
-             }
+         if (preset && preset.name()) {
+           // use the preset name if there is a match
+           return preset.name();
+         } // fallback to the display type (node/way/relation)
 
-             // url (gfm)
-             if (!inLink && (token = this.tokenizer.url(src, mangle))) {
-               src = src.substring(token.raw.length);
-               tokens.push(token);
-               continue;
-             }
 
-             // text
-             if (token = this.tokenizer.inlineText(src, inRawBlock, smartypants)) {
-               src = src.substring(token.raw.length);
-               tokens.push(token);
-               continue;
-             }
+         return utilDisplayType(entity.id);
+       }
+       function utilEntityRoot(entityType) {
+         return {
+           node: 'n',
+           way: 'w',
+           relation: 'r'
+         }[entityType];
+       } // Returns a single object containing the tags of all the given entities.
+       // Example:
+       // {
+       //   highway: 'service',
+       //   service: 'parking_aisle'
+       // }
+       //           +
+       // {
+       //   highway: 'service',
+       //   service: 'driveway',
+       //   width: '3'
+       // }
+       //           =
+       // {
+       //   highway: 'service',
+       //   service: [ 'driveway', 'parking_aisle' ],
+       //   width: [ '3', undefined ]
+       // }
 
-             if (src) {
-               const errMsg = 'Infinite loop on byte: ' + src.charCodeAt(0);
-               if (this.options.silent) {
-                 console.error(errMsg);
-                 break;
+       function utilCombinedTags(entityIDs, graph) {
+         var tags = {};
+         var tagCounts = {};
+         var allKeys = new Set();
+         var entities = entityIDs.map(function (entityID) {
+           return graph.hasEntity(entityID);
+         }).filter(Boolean); // gather the aggregate keys
+
+         entities.forEach(function (entity) {
+           var keys = Object.keys(entity.tags).filter(Boolean);
+           keys.forEach(function (key) {
+             allKeys.add(key);
+           });
+         });
+         entities.forEach(function (entity) {
+           allKeys.forEach(function (key) {
+             var value = entity.tags[key]; // purposely allow `undefined`
+
+             if (!tags.hasOwnProperty(key)) {
+               // first value, set as raw
+               tags[key] = value;
+             } else {
+               if (!Array.isArray(tags[key])) {
+                 if (tags[key] !== value) {
+                   // first alternate value, replace single value with array
+                   tags[key] = [tags[key], value];
+                 }
                } else {
-                 throw new Error(errMsg);
+                 // type is array
+                 if (tags[key].indexOf(value) === -1) {
+                   // subsequent alternate value, add to array
+                   tags[key].push(value);
+                 }
                }
              }
-           }
-
-           return tokens;
-         }
-       };
 
-       const { defaults: defaults$3 } = defaults;
-       const {
-         cleanUrl: cleanUrl$1,
-         escape: escape$3
-       } = helpers;
-
-       /**
-        * Renderer
-        */
-       var Renderer_1 = class Renderer {
-         constructor(options) {
-           this.options = options || defaults$3;
-         }
+             var tagHash = key + '=' + value;
+             if (!tagCounts[tagHash]) tagCounts[tagHash] = 0;
+             tagCounts[tagHash] += 1;
+           });
+         });
 
-         code(code, infostring, escaped) {
-           const lang = (infostring || '').match(/\S*/)[0];
-           if (this.options.highlight) {
-             const out = this.options.highlight(code, lang);
-             if (out != null && out !== code) {
-               escaped = true;
-               code = out;
-             }
-           }
+         for (var key in tags) {
+           if (!Array.isArray(tags[key])) continue; // sort values by frequency then alphabetically
 
-           if (!lang) {
-             return '<pre><code>'
-               + (escaped ? code : escape$3(code, true))
-               + '</code></pre>';
-           }
+           tags[key] = tags[key].sort(function (val1, val2) {
+             var key = key; // capture
 
-           return '<pre><code class="'
-             + this.options.langPrefix
-             + escape$3(lang, true)
-             + '">'
-             + (escaped ? code : escape$3(code, true))
-             + '</code></pre>\n';
-         }
+             var count2 = tagCounts[key + '=' + val2];
+             var count1 = tagCounts[key + '=' + val1];
 
-         blockquote(quote) {
-           return '<blockquote>\n' + quote + '</blockquote>\n';
-         }
+             if (count2 !== count1) {
+               return count2 - count1;
+             }
 
-         html(html) {
-           return html;
-         }
+             if (val2 && val1) {
+               return val1.localeCompare(val2);
+             }
 
-         heading(text, level, raw, slugger) {
-           if (this.options.headerIds) {
-             return '<h'
-               + level
-               + ' id="'
-               + this.options.headerPrefix
-               + slugger.slug(raw)
-               + '">'
-               + text
-               + '</h'
-               + level
-               + '>\n';
-           }
-           // ignore IDs
-           return '<h' + level + '>' + text + '</h' + level + '>\n';
+             return val1 ? 1 : -1;
+           });
          }
 
-         hr() {
-           return this.options.xhtml ? '<hr/>\n' : '<hr>\n';
-         }
+         return tags;
+       }
+       function utilStringQs(str) {
+         var i = 0; // advance past any leading '?' or '#' characters
 
-         list(body, ordered, start) {
-           const type = ordered ? 'ol' : 'ul',
-             startatt = (ordered && start !== 1) ? (' start="' + start + '"') : '';
-           return '<' + type + startatt + '>\n' + body + '</' + type + '>\n';
+         while (i < str.length && (str[i] === '?' || str[i] === '#')) {
+           i++;
          }
 
-         listitem(text) {
-           return '<li>' + text + '</li>\n';
-         }
+         str = str.slice(i);
+         return str.split('&').reduce(function (obj, pair) {
+           var parts = pair.split('=');
 
-         checkbox(checked) {
-           return '<input '
-             + (checked ? 'checked="" ' : '')
-             + 'disabled="" type="checkbox"'
-             + (this.options.xhtml ? ' /' : '')
-             + '> ';
-         }
+           if (parts.length === 2) {
+             obj[parts[0]] = null === parts[1] ? '' : decodeURIComponent(parts[1]);
+           }
 
-         paragraph(text) {
-           return '<p>' + text + '</p>\n';
+           return obj;
+         }, {});
+       }
+       function utilQsString(obj, noencode) {
+         // encode everything except special characters used in certain hash parameters:
+         // "/" in map states, ":", ",", {" and "}" in background
+         function softEncode(s) {
+           return encodeURIComponent(s).replace(/(%2F|%3A|%2C|%7B|%7D)/g, decodeURIComponent);
          }
 
-         table(header, body) {
-           if (body) body = '<tbody>' + body + '</tbody>';
+         return Object.keys(obj).sort().map(function (key) {
+           return encodeURIComponent(key) + '=' + (noencode ? softEncode(obj[key]) : encodeURIComponent(obj[key]));
+         }).join('&');
+       }
+       function utilPrefixDOMProperty(property) {
+         var prefixes = ['webkit', 'ms', 'moz', 'o'];
+         var i = -1;
+         var n = prefixes.length;
+         var s = document.body;
+         if (property in s) return property;
+         property = property.substr(0, 1).toUpperCase() + property.substr(1);
 
-           return '<table>\n'
-             + '<thead>\n'
-             + header
-             + '</thead>\n'
-             + body
-             + '</table>\n';
+         while (++i < n) {
+           if (prefixes[i] + property in s) {
+             return prefixes[i] + property;
+           }
          }
 
-         tablerow(content) {
-           return '<tr>\n' + content + '</tr>\n';
-         }
+         return false;
+       }
+       function utilPrefixCSSProperty(property) {
+         var prefixes = ['webkit', 'ms', 'Moz', 'O'];
+         var i = -1;
+         var n = prefixes.length;
+         var s = document.body.style;
 
-         tablecell(content, flags) {
-           const type = flags.header ? 'th' : 'td';
-           const tag = flags.align
-             ? '<' + type + ' align="' + flags.align + '">'
-             : '<' + type + '>';
-           return tag + content + '</' + type + '>\n';
+         if (property.toLowerCase() in s) {
+           return property.toLowerCase();
          }
 
-         // span level renderer
-         strong(text) {
-           return '<strong>' + text + '</strong>';
+         while (++i < n) {
+           if (prefixes[i] + property in s) {
+             return '-' + prefixes[i].toLowerCase() + property.replace(/([A-Z])/g, '-$1').toLowerCase();
+           }
          }
 
-         em(text) {
-           return '<em>' + text + '</em>';
-         }
+         return false;
+       }
+       var transformProperty;
+       function utilSetTransform(el, x, y, scale) {
+         var prop = transformProperty = transformProperty || utilPrefixCSSProperty('Transform');
+         var translate = utilDetect().opera ? 'translate(' + x + 'px,' + y + 'px)' : 'translate3d(' + x + 'px,' + y + 'px,0)';
+         return el.style(prop, translate + (scale ? ' scale(' + scale + ')' : ''));
+       } // Calculates Levenshtein distance between two strings
+       // see:  https://en.wikipedia.org/wiki/Levenshtein_distance
+       // first converts the strings to lowercase and replaces diacritic marks with ascii equivalents.
 
-         codespan(text) {
-           return '<code>' + text + '</code>';
-         }
+       function utilEditDistance(a, b) {
+         a = remove$1(a.toLowerCase());
+         b = remove$1(b.toLowerCase());
+         if (a.length === 0) return b.length;
+         if (b.length === 0) return a.length;
+         var matrix = [];
+         var i, j;
 
-         br() {
-           return this.options.xhtml ? '<br/>' : '<br>';
+         for (i = 0; i <= b.length; i++) {
+           matrix[i] = [i];
          }
 
-         del(text) {
-           return '<del>' + text + '</del>';
+         for (j = 0; j <= a.length; j++) {
+           matrix[0][j] = j;
          }
 
-         link(href, title, text) {
-           href = cleanUrl$1(this.options.sanitize, this.options.baseUrl, href);
-           if (href === null) {
-             return text;
-           }
-           let out = '<a href="' + escape$3(href) + '"';
-           if (title) {
-             out += ' title="' + title + '"';
+         for (i = 1; i <= b.length; i++) {
+           for (j = 1; j <= a.length; j++) {
+             if (b.charAt(i - 1) === a.charAt(j - 1)) {
+               matrix[i][j] = matrix[i - 1][j - 1];
+             } else {
+               matrix[i][j] = Math.min(matrix[i - 1][j - 1] + 1, // substitution
+               Math.min(matrix[i][j - 1] + 1, // insertion
+               matrix[i - 1][j] + 1)); // deletion
+             }
            }
-           out += '>' + text + '</a>';
-           return out;
          }
 
-         image(href, title, text) {
-           href = cleanUrl$1(this.options.sanitize, this.options.baseUrl, href);
-           if (href === null) {
-             return text;
-           }
+         return matrix[b.length][a.length];
+       } // a d3.mouse-alike which
+       // 1. Only works on HTML elements, not SVG
+       // 2. Does not cause style recalculation
 
-           let out = '<img src="' + href + '" alt="' + text + '"';
-           if (title) {
-             out += ' title="' + title + '"';
-           }
-           out += this.options.xhtml ? '/>' : '>';
-           return out;
-         }
+       function utilFastMouse(container) {
+         var rect = container.getBoundingClientRect();
+         var rectLeft = rect.left;
+         var rectTop = rect.top;
+         var clientLeft = +container.clientLeft;
+         var clientTop = +container.clientTop;
+         return function (e) {
+           return [e.clientX - rectLeft - clientLeft, e.clientY - rectTop - clientTop];
+         };
+       }
+       function utilAsyncMap(inputs, func, callback) {
+         var remaining = inputs.length;
+         var results = [];
+         var errors = [];
+         inputs.forEach(function (d, i) {
+           func(d, function done(err, data) {
+             errors[i] = err;
+             results[i] = data;
+             remaining--;
+             if (!remaining) callback(errors, results);
+           });
+         });
+       } // wraps an index to an interval [0..length-1]
 
-         text(text) {
-           return text;
+       function utilWrap(index, length) {
+         if (index < 0) {
+           index += Math.ceil(-index / length) * length;
          }
-       };
 
+         return index % length;
+       }
        /**
-        * TextRenderer
-        * returns only the textual part of the token
+        * a replacement for functor
+        *
+        * @param {*} value any value
+        * @returns {Function} a function that returns that value or the value if it's a function
         */
-       var TextRenderer_1 = class TextRenderer {
-         // no need for block level renderers
-         strong(text) {
-           return text;
-         }
 
-         em(text) {
-           return text;
-         }
+       function utilFunctor(value) {
+         if (typeof value === 'function') return value;
+         return function () {
+           return value;
+         };
+       }
+       function utilNoAuto(selection) {
+         var isText = selection.size() && selection.node().tagName.toLowerCase() === 'textarea';
+         return selection // assign 'new-password' even for non-password fields to prevent browsers (Chrome) ignoring 'off'
+         .attr('autocomplete', 'new-password').attr('autocorrect', 'off').attr('autocapitalize', 'off').attr('spellcheck', isText ? 'true' : 'false');
+       } // https://stackoverflow.com/questions/194846/is-there-any-kind-of-hash-code-function-in-javascript
+       // https://werxltd.com/wp/2010/05/13/javascript-implementation-of-javas-string-hashcode-method/
 
-         codespan(text) {
-           return text;
-         }
+       function utilHashcode(str) {
+         var hash = 0;
 
-         del(text) {
-           return text;
+         if (str.length === 0) {
+           return hash;
          }
 
-         html(text) {
-           return text;
-         }
+         for (var i = 0; i < str.length; i++) {
+           var _char = str.charCodeAt(i);
 
-         text(text) {
-           return text;
+           hash = (hash << 5) - hash + _char;
+           hash = hash & hash; // Convert to 32bit integer
          }
 
-         link(href, title, text) {
-           return '' + text;
-         }
+         return hash;
+       } // Returns version of `str` with all runs of special characters replaced by `_`;
+       // suitable for HTML ids, classes, selectors, etc.
 
-         image(href, title, text) {
-           return '' + text;
-         }
+       function utilSafeClassName(str) {
+         return str.toLowerCase().replace(/[^a-z0-9]+/g, '_');
+       } // Returns string based on `val` that is highly unlikely to collide with an id
+       // used previously or that's present elsewhere in the document. Useful for preventing
+       // browser-provided autofills or when embedding iD on pages with unknown elements.
 
-         br() {
-           return '';
-         }
-       };
+       function utilUniqueDomId(val) {
+         return 'ideditor-' + utilSafeClassName(val.toString()) + '-' + new Date().getTime().toString();
+       } // Returns the length of `str` in unicode characters. This can be less than
+       // `String.length()` since a single unicode character can be composed of multiple
+       // JavaScript UTF-16 code units.
 
-       /**
-        * Slugger generates header id
-        */
-       var Slugger_1 = class Slugger {
-         constructor() {
-           this.seen = {};
-         }
+       function utilUnicodeCharsCount(str) {
+         // Native ES2015 implementations of `Array.from` split strings into unicode characters
+         return Array.from(str).length;
+       } // Returns a new string representing `str` cut from its start to `limit` length
+       // in unicode characters. Note that this runs the risk of splitting graphemes.
 
-         /**
-          * Convert string to unique id
-          */
-         slug(value) {
-           let slug = value
-             .toLowerCase()
-             .trim()
-             // remove html tags
-             .replace(/<[!\/a-z].*?>/ig, '')
-             // remove unwanted chars
-             .replace(/[\u2000-\u206F\u2E00-\u2E7F\\'!"#$%&()*+,./:;<=>?@[\]^`{|}~]/g, '')
-             .replace(/\s/g, '-');
-
-           if (this.seen.hasOwnProperty(slug)) {
-             const originalSlug = slug;
-             do {
-               this.seen[originalSlug]++;
-               slug = originalSlug + '-' + this.seen[originalSlug];
-             } while (this.seen.hasOwnProperty(slug));
-           }
-           this.seen[slug] = 0;
+       function utilUnicodeCharsTruncated(str, limit) {
+         return Array.from(str).slice(0, limit).join('');
+       }
 
-           return slug;
-         }
-       };
+       function osmEntity(attrs) {
+         // For prototypal inheritance.
+         if (this instanceof osmEntity) return; // Create the appropriate subtype.
 
-       const { defaults: defaults$4 } = defaults;
-       const {
-         unescape: unescape$2
-       } = helpers;
+         if (attrs && attrs.type) {
+           return osmEntity[attrs.type].apply(this, arguments);
+         } else if (attrs && attrs.id) {
+           return osmEntity[osmEntity.id.type(attrs.id)].apply(this, arguments);
+         } // Initialize a generic Entity (used only in tests).
 
-       /**
-        * Parsing & Compiling
-        */
-       var Parser_1 = class Parser {
-         constructor(options) {
-           this.options = options || defaults$4;
-           this.options.renderer = this.options.renderer || new Renderer_1();
-           this.renderer = this.options.renderer;
-           this.renderer.options = this.options;
-           this.textRenderer = new TextRenderer_1();
-           this.slugger = new Slugger_1();
-         }
 
-         /**
-          * Static Parse Method
-          */
-         static parse(tokens, options) {
-           const parser = new Parser(options);
-           return parser.parse(tokens);
-         }
+         return new osmEntity().initialize(arguments);
+       }
 
-         /**
-          * Parse Loop
-          */
-         parse(tokens, top = true) {
-           let out = '',
-             i,
-             j,
-             k,
-             l2,
-             l3,
-             row,
-             cell,
-             header,
-             body,
-             token,
-             ordered,
-             start,
-             loose,
-             itemBody,
-             item,
-             checked,
-             task,
-             checkbox;
-
-           const l = tokens.length;
-           for (i = 0; i < l; i++) {
-             token = tokens[i];
-             switch (token.type) {
-               case 'space': {
-                 continue;
-               }
-               case 'hr': {
-                 out += this.renderer.hr();
-                 continue;
-               }
-               case 'heading': {
-                 out += this.renderer.heading(
-                   this.parseInline(token.tokens),
-                   token.depth,
-                   unescape$2(this.parseInline(token.tokens, this.textRenderer)),
-                   this.slugger);
-                 continue;
-               }
-               case 'code': {
-                 out += this.renderer.code(token.text,
-                   token.lang,
-                   token.escaped);
-                 continue;
-               }
-               case 'table': {
-                 header = '';
-
-                 // header
-                 cell = '';
-                 l2 = token.header.length;
-                 for (j = 0; j < l2; j++) {
-                   cell += this.renderer.tablecell(
-                     this.parseInline(token.tokens.header[j]),
-                     { header: true, align: token.align[j] }
-                   );
-                 }
-                 header += this.renderer.tablerow(cell);
-
-                 body = '';
-                 l2 = token.cells.length;
-                 for (j = 0; j < l2; j++) {
-                   row = token.tokens.cells[j];
-
-                   cell = '';
-                   l3 = row.length;
-                   for (k = 0; k < l3; k++) {
-                     cell += this.renderer.tablecell(
-                       this.parseInline(row[k]),
-                       { header: false, align: token.align[k] }
-                     );
-                   }
+       osmEntity.id = function (type) {
+         return osmEntity.id.fromOSM(type, osmEntity.id.next[type]--);
+       };
+
+       osmEntity.id.next = {
+         changeset: -1,
+         node: -1,
+         way: -1,
+         relation: -1
+       };
+
+       osmEntity.id.fromOSM = function (type, id) {
+         return type[0] + id;
+       };
 
-                   body += this.renderer.tablerow(cell);
-                 }
-                 out += this.renderer.table(header, body);
-                 continue;
-               }
-               case 'blockquote': {
-                 body = this.parse(token.tokens);
-                 out += this.renderer.blockquote(body);
-                 continue;
-               }
-               case 'list': {
-                 ordered = token.ordered;
-                 start = token.start;
-                 loose = token.loose;
-                 l2 = token.items.length;
-
-                 body = '';
-                 for (j = 0; j < l2; j++) {
-                   item = token.items[j];
-                   checked = item.checked;
-                   task = item.task;
-
-                   itemBody = '';
-                   if (item.task) {
-                     checkbox = this.renderer.checkbox(checked);
-                     if (loose) {
-                       if (item.tokens[0].type === 'text') {
-                         item.tokens[0].text = checkbox + ' ' + item.tokens[0].text;
-                         if (item.tokens[0].tokens && item.tokens[0].tokens.length > 0 && item.tokens[0].tokens[0].type === 'text') {
-                           item.tokens[0].tokens[0].text = checkbox + ' ' + item.tokens[0].tokens[0].text;
-                         }
-                       } else {
-                         item.tokens.unshift({
-                           type: 'text',
-                           text: checkbox
-                         });
-                       }
-                     } else {
-                       itemBody += checkbox;
-                     }
-                   }
+       osmEntity.id.toOSM = function (id) {
+         return id.slice(1);
+       };
 
-                   itemBody += this.parse(item.tokens, loose);
-                   body += this.renderer.listitem(itemBody, task, checked);
-                 }
+       osmEntity.id.type = function (id) {
+         return {
+           'c': 'changeset',
+           'n': 'node',
+           'w': 'way',
+           'r': 'relation'
+         }[id[0]];
+       }; // A function suitable for use as the second argument to d3.selection#data().
 
-                 out += this.renderer.list(body, ordered, start);
-                 continue;
-               }
-               case 'html': {
-                 // TODO parse inline content if parameter markdown=1
-                 out += this.renderer.html(token.text);
-                 continue;
-               }
-               case 'paragraph': {
-                 out += this.renderer.paragraph(this.parseInline(token.tokens));
-                 continue;
-               }
-               case 'text': {
-                 body = token.tokens ? this.parseInline(token.tokens) : token.text;
-                 while (i + 1 < l && tokens[i + 1].type === 'text') {
-                   token = tokens[++i];
-                   body += '\n' + (token.tokens ? this.parseInline(token.tokens) : token.text);
-                 }
-                 out += top ? this.renderer.paragraph(body) : body;
-                 continue;
-               }
-               default: {
-                 const errMsg = 'Token with "' + token.type + '" type was not found.';
-                 if (this.options.silent) {
-                   console.error(errMsg);
-                   return;
+
+       osmEntity.key = function (entity) {
+         return entity.id + 'v' + (entity.v || 0);
+       };
+
+       var _deprecatedTagValuesByKey;
+
+       osmEntity.deprecatedTagValuesByKey = function (dataDeprecated) {
+         if (!_deprecatedTagValuesByKey) {
+           _deprecatedTagValuesByKey = {};
+           dataDeprecated.forEach(function (d) {
+             var oldKeys = Object.keys(d.old);
+
+             if (oldKeys.length === 1) {
+               var oldKey = oldKeys[0];
+               var oldValue = d.old[oldKey];
+
+               if (oldValue !== '*') {
+                 if (!_deprecatedTagValuesByKey[oldKey]) {
+                   _deprecatedTagValuesByKey[oldKey] = [oldValue];
                  } else {
-                   throw new Error(errMsg);
+                   _deprecatedTagValuesByKey[oldKey].push(oldValue);
                  }
                }
              }
-           }
-
-           return out;
+           });
          }
 
-         /**
-          * Parse Inline Tokens
-          */
-         parseInline(tokens, renderer) {
-           renderer = renderer || this.renderer;
-           let out = '',
-             i,
-             token;
+         return _deprecatedTagValuesByKey;
+       };
 
-           const l = tokens.length;
-           for (i = 0; i < l; i++) {
-             token = tokens[i];
-             switch (token.type) {
-               case 'escape': {
-                 out += renderer.text(token.text);
-                 break;
-               }
-               case 'html': {
-                 out += renderer.html(token.text);
-                 break;
-               }
-               case 'link': {
-                 out += renderer.link(token.href, token.title, this.parseInline(token.tokens, renderer));
-                 break;
-               }
-               case 'image': {
-                 out += renderer.image(token.href, token.title, token.text);
-                 break;
-               }
-               case 'strong': {
-                 out += renderer.strong(this.parseInline(token.tokens, renderer));
-                 break;
-               }
-               case 'em': {
-                 out += renderer.em(this.parseInline(token.tokens, renderer));
-                 break;
-               }
-               case 'codespan': {
-                 out += renderer.codespan(token.text);
-                 break;
-               }
-               case 'br': {
-                 out += renderer.br();
-                 break;
-               }
-               case 'del': {
-                 out += renderer.del(this.parseInline(token.tokens, renderer));
-                 break;
-               }
-               case 'text': {
-                 out += renderer.text(token.text);
-                 break;
-               }
-               default: {
-                 const errMsg = 'Token with "' + token.type + '" type was not found.';
-                 if (this.options.silent) {
-                   console.error(errMsg);
-                   return;
+       osmEntity.prototype = {
+         tags: {},
+         initialize: function initialize(sources) {
+           for (var i = 0; i < sources.length; ++i) {
+             var source = sources[i];
+
+             for (var prop in source) {
+               if (Object.prototype.hasOwnProperty.call(source, prop)) {
+                 if (source[prop] === undefined) {
+                   delete this[prop];
                  } else {
-                   throw new Error(errMsg);
+                   this[prop] = source[prop];
                  }
                }
              }
            }
-           return out;
-         }
-       };
-
-       const {
-         merge: merge$3,
-         checkSanitizeDeprecation: checkSanitizeDeprecation$1,
-         escape: escape$4
-       } = helpers;
-       const {
-         getDefaults,
-         changeDefaults,
-         defaults: defaults$5
-       } = defaults;
-
-       /**
-        * Marked
-        */
-       function marked(src, opt, callback) {
-         // throw error in case of non string input
-         if (typeof src === 'undefined' || src === null) {
-           throw new Error('marked(): input parameter is undefined or null');
-         }
-         if (typeof src !== 'string') {
-           throw new Error('marked(): input parameter is of type '
-             + Object.prototype.toString.call(src) + ', string expected');
-         }
 
-         if (callback || typeof opt === 'function') {
-           if (!callback) {
-             callback = opt;
-             opt = null;
+           if (!this.id && this.type) {
+             this.id = osmEntity.id(this.type);
            }
 
-           opt = merge$3({}, marked.defaults, opt || {});
-           checkSanitizeDeprecation$1(opt);
-           const highlight = opt.highlight;
-           let tokens,
-             pending,
-             i = 0;
-
-           try {
-             tokens = Lexer_1.lex(src, opt);
-           } catch (e) {
-             return callback(e);
+           if (!this.hasOwnProperty('visible')) {
+             this.visible = true;
            }
 
-           pending = tokens.length;
-
-           const done = function(err) {
-             if (err) {
-               opt.highlight = highlight;
-               return callback(err);
-             }
+           return this;
+         },
+         copy: function copy(resolver, copies) {
+           if (copies[this.id]) return copies[this.id];
+           var copy = osmEntity(this, {
+             id: undefined,
+             user: undefined,
+             version: undefined
+           });
+           copies[this.id] = copy;
+           return copy;
+         },
+         osmId: function osmId() {
+           return osmEntity.id.toOSM(this.id);
+         },
+         isNew: function isNew() {
+           return this.osmId() < 0;
+         },
+         update: function update(attrs) {
+           return osmEntity(this, attrs, {
+             v: 1 + (this.v || 0)
+           });
+         },
+         mergeTags: function mergeTags(tags) {
+           var merged = Object.assign({}, this.tags); // shallow copy
 
-             let out;
+           var changed = false;
 
-             try {
-               out = Parser_1.parse(tokens, opt);
-             } catch (e) {
-               err = e;
+           for (var k in tags) {
+             var t1 = merged[k];
+             var t2 = tags[k];
+
+             if (!t1) {
+               changed = true;
+               merged[k] = t2;
+             } else if (t1 !== t2) {
+               changed = true;
+               merged[k] = utilUnicodeCharsTruncated(utilArrayUnion(t1.split(/;\s*/), t2.split(/;\s*/)).join(';'), 255 // avoid exceeding character limit; see also services/osm.js -> maxCharsForTagValue()
+               );
              }
-
-             opt.highlight = highlight;
-
-             return err
-               ? callback(err)
-               : callback(null, out);
-           };
-
-           if (!highlight || highlight.length < 3) {
-             return done();
            }
 
-           delete opt.highlight;
+           return changed ? this.update({
+             tags: merged
+           }) : this;
+         },
+         intersects: function intersects(extent, resolver) {
+           return this.extent(resolver).intersects(extent);
+         },
+         hasNonGeometryTags: function hasNonGeometryTags() {
+           return Object.keys(this.tags).some(function (k) {
+             return k !== 'area';
+           });
+         },
+         hasParentRelations: function hasParentRelations(resolver) {
+           return resolver.parentRelations(this).length > 0;
+         },
+         hasInterestingTags: function hasInterestingTags() {
+           return Object.keys(this.tags).some(osmIsInterestingTag);
+         },
+         hasWikidata: function hasWikidata() {
+           return !!this.tags.wikidata || !!this.tags['brand:wikidata'];
+         },
+         isHighwayIntersection: function isHighwayIntersection() {
+           return false;
+         },
+         isDegenerate: function isDegenerate() {
+           return true;
+         },
+         deprecatedTags: function deprecatedTags(dataDeprecated) {
+           var tags = this.tags; // if there are no tags, none can be deprecated
+
+           if (Object.keys(tags).length === 0) return [];
+           var deprecated = [];
+           dataDeprecated.forEach(function (d) {
+             var oldKeys = Object.keys(d.old);
+
+             if (d.replace) {
+               var hasExistingValues = Object.keys(d.replace).some(function (replaceKey) {
+                 if (!tags[replaceKey] || d.old[replaceKey]) return false;
+                 var replaceValue = d.replace[replaceKey];
+                 if (replaceValue === '*') return false;
+                 if (replaceValue === tags[replaceKey]) return false;
+                 return true;
+               }); // don't flag deprecated tags if the upgrade path would overwrite existing data - #7843
 
-           if (!pending) return done();
+               if (hasExistingValues) return;
+             }
 
-           for (; i < tokens.length; i++) {
-             (function(token) {
-               if (token.type !== 'code') {
-                 return --pending || done();
-               }
-               return highlight(token.text, token.lang, function(err, code) {
-                 if (err) return done(err);
-                 if (code == null || code === token.text) {
-                   return --pending || done();
-                 }
-                 token.text = code;
-                 token.escaped = true;
-                 --pending || done();
-               });
-             })(tokens[i]);
-           }
+             var matchesDeprecatedTags = oldKeys.every(function (oldKey) {
+               if (!tags[oldKey]) return false;
+               if (d.old[oldKey] === '*') return true;
+               if (d.old[oldKey] === tags[oldKey]) return true;
+               var vals = tags[oldKey].split(';').filter(Boolean);
 
-           return;
-         }
-         try {
-           opt = merge$3({}, marked.defaults, opt || {});
-           checkSanitizeDeprecation$1(opt);
-           return Parser_1.parse(Lexer_1.lex(src, opt), opt);
-         } catch (e) {
-           e.message += '\nPlease report this to https://github.com/markedjs/marked.';
-           if ((opt || marked.defaults).silent) {
-             return '<p>An error occurred:</p><pre>'
-               + escape$4(e.message + '', true)
-               + '</pre>';
-           }
-           throw e;
-         }
-       }
+               if (vals.length === 0) {
+                 return false;
+               } else if (vals.length > 1) {
+                 return vals.indexOf(d.old[oldKey]) !== -1;
+               } else {
+                 if (tags[oldKey] === d.old[oldKey]) {
+                   if (d.replace && d.old[oldKey] === d.replace[oldKey]) {
+                     var replaceKeys = Object.keys(d.replace);
+                     return !replaceKeys.every(function (replaceKey) {
+                       return tags[replaceKey] === d.replace[replaceKey];
+                     });
+                   } else {
+                     return true;
+                   }
+                 }
+               }
 
-       /**
-        * Options
-        */
+               return false;
+             });
 
-       marked.options =
-       marked.setOptions = function(opt) {
-         merge$3(marked.defaults, opt);
-         changeDefaults(marked.defaults);
-         return marked;
+             if (matchesDeprecatedTags) {
+               deprecated.push(d);
+             }
+           });
+           return deprecated;
+         }
        };
 
-       marked.getDefaults = getDefaults;
+       function osmLanes(entity) {
+         if (entity.type !== 'way') return null;
+         if (!entity.tags.highway) return null;
+         var tags = entity.tags;
+         var isOneWay = entity.isOneWay();
+         var laneCount = getLaneCount(tags, isOneWay);
+         var maxspeed = parseMaxspeed(tags);
+         var laneDirections = parseLaneDirections(tags, isOneWay, laneCount);
+         var forward = laneDirections.forward;
+         var backward = laneDirections.backward;
+         var bothways = laneDirections.bothways; // parse the piped string 'x|y|z' format
+
+         var turnLanes = {};
+         turnLanes.unspecified = parseTurnLanes(tags['turn:lanes']);
+         turnLanes.forward = parseTurnLanes(tags['turn:lanes:forward']);
+         turnLanes.backward = parseTurnLanes(tags['turn:lanes:backward']);
+         var maxspeedLanes = {};
+         maxspeedLanes.unspecified = parseMaxspeedLanes(tags['maxspeed:lanes'], maxspeed);
+         maxspeedLanes.forward = parseMaxspeedLanes(tags['maxspeed:lanes:forward'], maxspeed);
+         maxspeedLanes.backward = parseMaxspeedLanes(tags['maxspeed:lanes:backward'], maxspeed);
+         var psvLanes = {};
+         psvLanes.unspecified = parseMiscLanes(tags['psv:lanes']);
+         psvLanes.forward = parseMiscLanes(tags['psv:lanes:forward']);
+         psvLanes.backward = parseMiscLanes(tags['psv:lanes:backward']);
+         var busLanes = {};
+         busLanes.unspecified = parseMiscLanes(tags['bus:lanes']);
+         busLanes.forward = parseMiscLanes(tags['bus:lanes:forward']);
+         busLanes.backward = parseMiscLanes(tags['bus:lanes:backward']);
+         var taxiLanes = {};
+         taxiLanes.unspecified = parseMiscLanes(tags['taxi:lanes']);
+         taxiLanes.forward = parseMiscLanes(tags['taxi:lanes:forward']);
+         taxiLanes.backward = parseMiscLanes(tags['taxi:lanes:backward']);
+         var hovLanes = {};
+         hovLanes.unspecified = parseMiscLanes(tags['hov:lanes']);
+         hovLanes.forward = parseMiscLanes(tags['hov:lanes:forward']);
+         hovLanes.backward = parseMiscLanes(tags['hov:lanes:backward']);
+         var hgvLanes = {};
+         hgvLanes.unspecified = parseMiscLanes(tags['hgv:lanes']);
+         hgvLanes.forward = parseMiscLanes(tags['hgv:lanes:forward']);
+         hgvLanes.backward = parseMiscLanes(tags['hgv:lanes:backward']);
+         var bicyclewayLanes = {};
+         bicyclewayLanes.unspecified = parseBicycleWay(tags['bicycleway:lanes']);
+         bicyclewayLanes.forward = parseBicycleWay(tags['bicycleway:lanes:forward']);
+         bicyclewayLanes.backward = parseBicycleWay(tags['bicycleway:lanes:backward']);
+         var lanesObj = {
+           forward: [],
+           backward: [],
+           unspecified: []
+         }; // map forward/backward/unspecified of each lane type to lanesObj
+
+         mapToLanesObj(lanesObj, turnLanes, 'turnLane');
+         mapToLanesObj(lanesObj, maxspeedLanes, 'maxspeed');
+         mapToLanesObj(lanesObj, psvLanes, 'psv');
+         mapToLanesObj(lanesObj, busLanes, 'bus');
+         mapToLanesObj(lanesObj, taxiLanes, 'taxi');
+         mapToLanesObj(lanesObj, hovLanes, 'hov');
+         mapToLanesObj(lanesObj, hgvLanes, 'hgv');
+         mapToLanesObj(lanesObj, bicyclewayLanes, 'bicycleway');
+         return {
+           metadata: {
+             count: laneCount,
+             oneway: isOneWay,
+             forward: forward,
+             backward: backward,
+             bothways: bothways,
+             turnLanes: turnLanes,
+             maxspeed: maxspeed,
+             maxspeedLanes: maxspeedLanes,
+             psvLanes: psvLanes,
+             busLanes: busLanes,
+             taxiLanes: taxiLanes,
+             hovLanes: hovLanes,
+             hgvLanes: hgvLanes,
+             bicyclewayLanes: bicyclewayLanes
+           },
+           lanes: lanesObj
+         };
+       }
 
-       marked.defaults = defaults$5;
+       function getLaneCount(tags, isOneWay) {
+         var count;
 
-       /**
-        * Use Extension
-        */
+         if (tags.lanes) {
+           count = parseInt(tags.lanes, 10);
 
-       marked.use = function(extension) {
-         const opts = merge$3({}, extension);
-         if (extension.renderer) {
-           const renderer = marked.defaults.renderer || new Renderer_1();
-           for (const prop in extension.renderer) {
-             const prevRenderer = renderer[prop];
-             renderer[prop] = (...args) => {
-               let ret = extension.renderer[prop].apply(renderer, args);
-               if (ret === false) {
-                 ret = prevRenderer.apply(renderer, args);
-               }
-               return ret;
-             };
+           if (count > 0) {
+             return count;
            }
-           opts.renderer = renderer;
          }
-         if (extension.tokenizer) {
-           const tokenizer = marked.defaults.tokenizer || new Tokenizer_1();
-           for (const prop in extension.tokenizer) {
-             const prevTokenizer = tokenizer[prop];
-             tokenizer[prop] = (...args) => {
-               let ret = extension.tokenizer[prop].apply(tokenizer, args);
-               if (ret === false) {
-                 ret = prevTokenizer.apply(tokenizer, args);
-               }
-               return ret;
-             };
-           }
-           opts.tokenizer = tokenizer;
-         }
-         marked.setOptions(opts);
-       };
 
-       /**
-        * Expose
-        */
+         switch (tags.highway) {
+           case 'trunk':
+           case 'motorway':
+             count = isOneWay ? 2 : 4;
+             break;
 
-       marked.Parser = Parser_1;
-       marked.parser = Parser_1.parse;
+           default:
+             count = isOneWay ? 1 : 2;
+             break;
+         }
 
-       marked.Renderer = Renderer_1;
-       marked.TextRenderer = TextRenderer_1;
+         return count;
+       }
 
-       marked.Lexer = Lexer_1;
-       marked.lexer = Lexer_1.lex;
+       function parseMaxspeed(tags) {
+         var maxspeed = tags.maxspeed;
+         if (!maxspeed) return;
+         var maxspeedRegex = /^([0-9][\.0-9]+?)(?:[ ]?(?:km\/h|kmh|kph|mph|knots))?$/;
+         if (!maxspeedRegex.test(maxspeed)) return;
+         return parseInt(maxspeed, 10);
+       }
 
-       marked.Tokenizer = Tokenizer_1;
+       function parseLaneDirections(tags, isOneWay, laneCount) {
+         var forward = parseInt(tags['lanes:forward'], 10);
+         var backward = parseInt(tags['lanes:backward'], 10);
+         var bothways = parseInt(tags['lanes:both_ways'], 10) > 0 ? 1 : 0;
 
-       marked.Slugger = Slugger_1;
+         if (parseInt(tags.oneway, 10) === -1) {
+           forward = 0;
+           bothways = 0;
+           backward = laneCount;
+         } else if (isOneWay) {
+           forward = laneCount;
+           bothways = 0;
+           backward = 0;
+         } else if (isNaN(forward) && isNaN(backward)) {
+           backward = Math.floor((laneCount - bothways) / 2);
+           forward = laneCount - bothways - backward;
+         } else if (isNaN(forward)) {
+           if (backward > laneCount - bothways) {
+             backward = laneCount - bothways;
+           }
 
-       marked.parse = marked;
+           forward = laneCount - bothways - backward;
+         } else if (isNaN(backward)) {
+           if (forward > laneCount - bothways) {
+             forward = laneCount - bothways;
+           }
 
-       var marked_1 = marked;
+           backward = laneCount - bothways - forward;
+         }
 
-       const tiler$2 = utilTiler();
-       const dispatch$3 = dispatch('loaded');
-       const _tileZoom$2 = 14;
-       const _osmoseUrlRoot = 'https://osmose.openstreetmap.fr/api/0.3';
-       let _osmoseData = { icons: {}, items: [] };
+         return {
+           forward: forward,
+           backward: backward,
+           bothways: bothways
+         };
+       }
 
-       // This gets reassigned if reset
-       let _cache$2;
+       function parseTurnLanes(tag) {
+         if (!tag) return;
+         var validValues = ['left', 'slight_left', 'sharp_left', 'through', 'right', 'slight_right', 'sharp_right', 'reverse', 'merge_to_left', 'merge_to_right', 'none'];
+         return tag.split('|').map(function (s) {
+           if (s === '') s = 'none';
+           return s.split(';').map(function (d) {
+             return validValues.indexOf(d) === -1 ? 'unknown' : d;
+           });
+         });
+       }
 
-       function abortRequest$2(controller) {
-         if (controller) {
-           controller.abort();
-         }
+       function parseMaxspeedLanes(tag, maxspeed) {
+         if (!tag) return;
+         return tag.split('|').map(function (s) {
+           if (s === 'none') return s;
+           var m = parseInt(s, 10);
+           if (s === '' || m === maxspeed) return null;
+           return isNaN(m) ? 'unknown' : m;
+         });
        }
 
-       function abortUnwantedRequests$2(cache, tiles) {
-         Object.keys(cache.inflightTile).forEach(k => {
-           let wanted = tiles.find(tile => k === tile.id);
-           if (!wanted) {
-             abortRequest$2(cache.inflightTile[k]);
-             delete cache.inflightTile[k];
-           }
+       function parseMiscLanes(tag) {
+         if (!tag) return;
+         var validValues = ['yes', 'no', 'designated'];
+         return tag.split('|').map(function (s) {
+           if (s === '') s = 'no';
+           return validValues.indexOf(s) === -1 ? 'unknown' : s;
          });
        }
 
-       function encodeIssueRtree$2(d) {
-         return { minX: d.loc[0], minY: d.loc[1], maxX: d.loc[0], maxY: d.loc[1], data: d };
+       function parseBicycleWay(tag) {
+         if (!tag) return;
+         var validValues = ['yes', 'no', 'designated', 'lane'];
+         return tag.split('|').map(function (s) {
+           if (s === '') s = 'no';
+           return validValues.indexOf(s) === -1 ? 'unknown' : s;
+         });
        }
 
-       // Replace or remove QAItem from rtree
-       function updateRtree$2(item, replace) {
-         _cache$2.rtree.remove(item, (a, b) => a.data.id === b.data.id);
+       function mapToLanesObj(lanesObj, data, key) {
+         if (data.forward) data.forward.forEach(function (l, i) {
+           if (!lanesObj.forward[i]) lanesObj.forward[i] = {};
+           lanesObj.forward[i][key] = l;
+         });
+         if (data.backward) data.backward.forEach(function (l, i) {
+           if (!lanesObj.backward[i]) lanesObj.backward[i] = {};
+           lanesObj.backward[i][key] = l;
+         });
+         if (data.unspecified) data.unspecified.forEach(function (l, i) {
+           if (!lanesObj.unspecified[i]) lanesObj.unspecified[i] = {};
+           lanesObj.unspecified[i][key] = l;
+         });
+       }
 
-         if (replace) {
-           _cache$2.rtree.insert(item);
+       function osmWay() {
+         if (!(this instanceof osmWay)) {
+           return new osmWay().initialize(arguments);
+         } else if (arguments.length) {
+           this.initialize(arguments);
          }
        }
+       osmEntity.way = osmWay;
+       osmWay.prototype = Object.create(osmEntity.prototype);
+       Object.assign(osmWay.prototype, {
+         type: 'way',
+         nodes: [],
+         copy: function copy(resolver, copies) {
+           if (copies[this.id]) return copies[this.id];
+           var copy = osmEntity.prototype.copy.call(this, resolver, copies);
+           var nodes = this.nodes.map(function (id) {
+             return resolver.entity(id).copy(resolver, copies).id;
+           });
+           copy = copy.update({
+             nodes: nodes
+           });
+           copies[this.id] = copy;
+           return copy;
+         },
+         extent: function extent(resolver) {
+           return resolver["transient"](this, 'extent', function () {
+             var extent = geoExtent();
 
-       // Issues shouldn't obscure eachother
-       function preventCoincident$1(loc) {
-         let coincident = false;
-         do {
-           // first time, move marker up. after that, move marker right.
-           let delta = coincident ? [0.00001, 0] : [0, 0.00001];
-           loc = geoVecAdd(loc, delta);
-           let bbox = geoExtent(loc).bbox();
-           coincident = _cache$2.rtree.search(bbox).length;
-         } while (coincident);
+             for (var i = 0; i < this.nodes.length; i++) {
+               var node = resolver.hasEntity(this.nodes[i]);
 
-         return loc;
-       }
+               if (node) {
+                 extent._extend(node.extent());
+               }
+             }
 
-       var serviceOsmose = {
-         title: 'osmose',
+             return extent;
+           });
+         },
+         first: function first() {
+           return this.nodes[0];
+         },
+         last: function last() {
+           return this.nodes[this.nodes.length - 1];
+         },
+         contains: function contains(node) {
+           return this.nodes.indexOf(node) >= 0;
+         },
+         affix: function affix(node) {
+           if (this.nodes[0] === node) return 'prefix';
+           if (this.nodes[this.nodes.length - 1] === node) return 'suffix';
+         },
+         layer: function layer() {
+           // explicit layer tag, clamp between -10, 10..
+           if (isFinite(this.tags.layer)) {
+             return Math.max(-10, Math.min(+this.tags.layer, 10));
+           } // implied layer tag..
+
+
+           if (this.tags.covered === 'yes') return -1;
+           if (this.tags.location === 'overground') return 1;
+           if (this.tags.location === 'underground') return -1;
+           if (this.tags.location === 'underwater') return -10;
+           if (this.tags.power === 'line') return 10;
+           if (this.tags.power === 'minor_line') return 10;
+           if (this.tags.aerialway) return 10;
+           if (this.tags.bridge) return 1;
+           if (this.tags.cutting) return -1;
+           if (this.tags.tunnel) return -1;
+           if (this.tags.waterway) return -1;
+           if (this.tags.man_made === 'pipeline') return -10;
+           if (this.tags.boundary) return -10;
+           return 0;
+         },
+         // the approximate width of the line based on its tags except its `width` tag
+         impliedLineWidthMeters: function impliedLineWidthMeters() {
+           var averageWidths = {
+             highway: {
+               // width is for single lane
+               motorway: 5,
+               motorway_link: 5,
+               trunk: 4.5,
+               trunk_link: 4.5,
+               primary: 4,
+               secondary: 4,
+               tertiary: 4,
+               primary_link: 4,
+               secondary_link: 4,
+               tertiary_link: 4,
+               unclassified: 4,
+               road: 4,
+               living_street: 4,
+               bus_guideway: 4,
+               pedestrian: 4,
+               residential: 3.5,
+               service: 3.5,
+               track: 3,
+               cycleway: 2.5,
+               bridleway: 2,
+               corridor: 2,
+               steps: 2,
+               path: 1.5,
+               footway: 1.5
+             },
+             railway: {
+               // width includes ties and rail bed, not just track gauge
+               rail: 2.5,
+               light_rail: 2.5,
+               tram: 2.5,
+               subway: 2.5,
+               monorail: 2.5,
+               funicular: 2.5,
+               disused: 2.5,
+               preserved: 2.5,
+               miniature: 1.5,
+               narrow_gauge: 1.5
+             },
+             waterway: {
+               river: 50,
+               canal: 25,
+               stream: 5,
+               tidal_channel: 5,
+               fish_pass: 2.5,
+               drain: 2.5,
+               ditch: 1.5
+             }
+           };
 
-         init() {
-           _mainFileFetcher.get('qa_data')
-             .then(d => {
-               _osmoseData = d.osmose;
-               _osmoseData.items = Object.keys(d.osmose.icons)
-                 .map(s => s.split('-')[0])
-                 .reduce((unique, item) => unique.indexOf(item) !== -1 ? unique : [...unique, item], []);
-             });
+           for (var key in averageWidths) {
+             if (this.tags[key] && averageWidths[key][this.tags[key]]) {
+               var width = averageWidths[key][this.tags[key]];
 
-           if (!_cache$2) {
-             this.reset();
+               if (key === 'highway') {
+                 var laneCount = this.tags.lanes && parseInt(this.tags.lanes, 10);
+                 if (!laneCount) laneCount = this.isOneWay() ? 1 : 2;
+                 return width * laneCount;
+               }
+
+               return width;
+             }
            }
 
-           this.event = utilRebind(this, dispatch$3, 'on');
+           return null;
          },
-
-         reset() {
-           let _strings = {};
-           let _colors = {};
-           if (_cache$2) {
-             Object.values(_cache$2.inflightTile).forEach(abortRequest$2);
-             // Strings and colors are static and should not be re-populated
-             _strings = _cache$2.strings;
-             _colors = _cache$2.colors;
-           }
-           _cache$2 = {
-             data: {},
-             loadedTile: {},
-             inflightTile: {},
-             inflightPost: {},
-             closed: {},
-             rtree: new RBush(),
-             strings: _strings,
-             colors: _colors
+         isOneWay: function isOneWay() {
+           // explicit oneway tag..
+           var values = {
+             'yes': true,
+             '1': true,
+             '-1': true,
+             'reversible': true,
+             'alternating': true,
+             'no': false,
+             '0': false
            };
-         },
 
-         loadIssues(projection) {
-           let params = {
-             // Tiles return a maximum # of issues
-             // So we want to filter our request for only types iD supports
-             item: _osmoseData.items
-           };
+           if (values[this.tags.oneway] !== undefined) {
+             return values[this.tags.oneway];
+           } // implied oneway tag..
 
-           // determine the needed tiles to cover the view
-           let tiles = tiler$2
-             .zoomExtent([_tileZoom$2, _tileZoom$2])
-             .getTiles(projection);
 
-           // abort inflight requests that are no longer needed
-           abortUnwantedRequests$2(_cache$2, tiles);
+           for (var key in this.tags) {
+             if (key in osmOneWayTags && this.tags[key] in osmOneWayTags[key]) return true;
+           }
 
-           // issue new requests..
-           tiles.forEach(tile => {
-             if (_cache$2.loadedTile[tile.id] || _cache$2.inflightTile[tile.id]) return;
+           return false;
+         },
+         // Some identifier for tag that implies that this way is "sided",
+         // i.e. the right side is the 'inside' (e.g. the right side of a
+         // natural=cliff is lower).
+         sidednessIdentifier: function sidednessIdentifier() {
+           for (var key in this.tags) {
+             var value = this.tags[key];
+
+             if (key in osmRightSideIsInsideTags && value in osmRightSideIsInsideTags[key]) {
+               if (osmRightSideIsInsideTags[key][value] === true) {
+                 return key;
+               } else {
+                 // if the map's value is something other than a
+                 // literal true, we should use it so we can
+                 // special case some keys (e.g. natural=coastline
+                 // is handled differently to other naturals).
+                 return osmRightSideIsInsideTags[key][value];
+               }
+             }
+           }
 
-             let [ x, y, z ] = tile.xyz;
-             let url = `${_osmoseUrlRoot}/issues/${z}/${x}/${y}.json?` + utilQsString(params);
+           return null;
+         },
+         isSided: function isSided() {
+           if (this.tags.two_sided === 'yes') {
+             return false;
+           }
 
-             let controller = new AbortController();
-             _cache$2.inflightTile[tile.id] = controller;
+           return this.sidednessIdentifier() !== null;
+         },
+         lanes: function lanes() {
+           return osmLanes(this);
+         },
+         isClosed: function isClosed() {
+           return this.nodes.length > 1 && this.first() === this.last();
+         },
+         isConvex: function isConvex(resolver) {
+           if (!this.isClosed() || this.isDegenerate()) return null;
+           var nodes = utilArrayUniq(resolver.childNodes(this));
+           var coords = nodes.map(function (n) {
+             return n.loc;
+           });
+           var curr = 0;
+           var prev = 0;
 
-             d3_json(url, { signal: controller.signal })
-               .then(data => {
-                 delete _cache$2.inflightTile[tile.id];
-                 _cache$2.loadedTile[tile.id] = true;
+           for (var i = 0; i < coords.length; i++) {
+             var o = coords[(i + 1) % coords.length];
+             var a = coords[i];
+             var b = coords[(i + 2) % coords.length];
+             var res = geoVecCross(a, b, o);
+             curr = res > 0 ? 1 : res < 0 ? -1 : 0;
 
-                 if (data.features) {
-                   data.features.forEach(issue => {
-                     const { item, class: cl, uuid: id } = issue.properties;
-                     /* Osmose issues are uniquely identified by a unique
-                       `item` and `class` combination (both integer values) */
-                     const itemType = `${item}-${cl}`;
+             if (curr === 0) {
+               continue;
+             } else if (prev && curr !== prev) {
+               return false;
+             }
 
-                     // Filter out unsupported issue types (some are too specific or advanced)
-                     if (itemType in _osmoseData.icons) {
-                       let loc = issue.geometry.coordinates; // lon, lat
-                       loc = preventCoincident$1(loc);
+             prev = curr;
+           }
 
-                       let d = new QAItem(loc, this, itemType, id, { item });
+           return true;
+         },
+         // returns an object with the tag that implies this is an area, if any
+         tagSuggestingArea: function tagSuggestingArea() {
+           return osmTagSuggestingArea(this.tags);
+         },
+         isArea: function isArea() {
+           if (this.tags.area === 'yes') return true;
+           if (!this.isClosed() || this.tags.area === 'no') return false;
+           return this.tagSuggestingArea() !== null;
+         },
+         isDegenerate: function isDegenerate() {
+           return new Set(this.nodes).size < (this.isArea() ? 3 : 2);
+         },
+         areAdjacent: function areAdjacent(n1, n2) {
+           for (var i = 0; i < this.nodes.length; i++) {
+             if (this.nodes[i] === n1) {
+               if (this.nodes[i - 1] === n2) return true;
+               if (this.nodes[i + 1] === n2) return true;
+             }
+           }
 
-                       // Setting elems here prevents UI detail requests
-                       if (item === 8300 || item === 8360) {
-                         d.elems = [];
-                       }
+           return false;
+         },
+         geometry: function geometry(graph) {
+           return graph["transient"](this, 'geometry', function () {
+             return this.isArea() ? 'area' : 'line';
+           });
+         },
+         // returns an array of objects representing the segments between the nodes in this way
+         segments: function segments(graph) {
+           function segmentExtent(graph) {
+             var n1 = graph.hasEntity(this.nodes[0]);
+             var n2 = graph.hasEntity(this.nodes[1]);
+             return n1 && n2 && geoExtent([[Math.min(n1.loc[0], n2.loc[0]), Math.min(n1.loc[1], n2.loc[1])], [Math.max(n1.loc[0], n2.loc[0]), Math.max(n1.loc[1], n2.loc[1])]]);
+           }
+
+           return graph["transient"](this, 'segments', function () {
+             var segments = [];
+
+             for (var i = 0; i < this.nodes.length - 1; i++) {
+               segments.push({
+                 id: this.id + '-' + i,
+                 wayId: this.id,
+                 index: i,
+                 nodes: [this.nodes[i], this.nodes[i + 1]],
+                 extent: segmentExtent
+               });
+             }
 
-                       _cache$2.data[d.id] = d;
-                       _cache$2.rtree.insert(encodeIssueRtree$2(d));
-                     }
-                   });
-                 }
+             return segments;
+           });
+         },
+         // If this way is not closed, append the beginning node to the end of the nodelist to close it.
+         close: function close() {
+           if (this.isClosed() || !this.nodes.length) return this;
+           var nodes = this.nodes.slice();
+           nodes = nodes.filter(noRepeatNodes);
+           nodes.push(nodes[0]);
+           return this.update({
+             nodes: nodes
+           });
+         },
+         // If this way is closed, remove any connector nodes from the end of the nodelist to unclose it.
+         unclose: function unclose() {
+           if (!this.isClosed()) return this;
+           var nodes = this.nodes.slice();
+           var connector = this.first();
+           var i = nodes.length - 1; // remove trailing connectors..
 
-                 dispatch$3.call('loaded');
-               })
-               .catch(() => {
-                 delete _cache$2.inflightTile[tile.id];
-                 _cache$2.loadedTile[tile.id] = true;
-               });
+           while (i > 0 && nodes.length > 1 && nodes[i] === connector) {
+             nodes.splice(i, 1);
+             i = nodes.length - 1;
+           }
+
+           nodes = nodes.filter(noRepeatNodes);
+           return this.update({
+             nodes: nodes
            });
          },
+         // Adds a node (id) in front of the node which is currently at position index.
+         // If index is undefined, the node will be added to the end of the way for linear ways,
+         //   or just before the final connecting node for circular ways.
+         // Consecutive duplicates are eliminated including existing ones.
+         // Circularity is always preserved when adding a node.
+         addNode: function addNode(id, index) {
+           var nodes = this.nodes.slice();
+           var isClosed = this.isClosed();
+           var max = isClosed ? nodes.length - 1 : nodes.length;
 
-         loadIssueDetail(issue) {
-           // Issue details only need to be fetched once
-           if (issue.elems !== undefined) {
-             return Promise.resolve(issue);
+           if (index === undefined) {
+             index = max;
            }
 
-           const url = `${_osmoseUrlRoot}/issue/${issue.id}?langs=${_mainLocalizer.localeCode()}`;
-           const cacheDetails = data => {
-             // Associated elements used for highlighting
-             // Assign directly for immediate use in the callback
-             issue.elems = data.elems.map(e => e.type.substring(0,1) + e.id);
+           if (index < 0 || index > max) {
+             throw new RangeError('index ' + index + ' out of range 0..' + max);
+           } // If this is a closed way, remove all connector nodes except the first one
+           // (there may be duplicates) and adjust index if necessary..
 
-             // Some issues have instance specific detail in a subtitle
-             issue.detail = data.subtitle ? marked_1(data.subtitle.auto) : '';
 
-             this.replaceItem(issue);
-           };
+           if (isClosed) {
+             var connector = this.first(); // leading connectors..
 
-           return d3_json(url).then(cacheDetails).then(() => issue);
-         },
+             var i = 1;
 
-         loadStrings(locale=_mainLocalizer.localeCode()) {
-           const items = Object.keys(_osmoseData.icons);
+             while (i < nodes.length && nodes.length > 2 && nodes[i] === connector) {
+               nodes.splice(i, 1);
+               if (index > i) index--;
+             } // trailing connectors..
 
-           if (
-             locale in _cache$2.strings
-             && Object.keys(_cache$2.strings[locale]).length === items.length
-           ) {
-               return Promise.resolve(_cache$2.strings[locale]);
-           }
 
-           // May be partially populated already if some requests were successful
-           if (!(locale in _cache$2.strings)) {
-             _cache$2.strings[locale] = {};
+             i = nodes.length - 1;
+
+             while (i > 0 && nodes.length > 1 && nodes[i] === connector) {
+               nodes.splice(i, 1);
+               if (index > i) index--;
+               i = nodes.length - 1;
+             }
            }
 
-           // Only need to cache strings for supported issue types
-           // Using multiple individual item + class requests to reduce fetched data size
-           const allRequests = items.map(itemType => {
-             // No need to request data we already have
-             if (itemType in _cache$2.strings[locale]) return;
+           nodes.splice(index, 0, id);
+           nodes = nodes.filter(noRepeatNodes); // If the way was closed before, append a connector node to keep it closed..
 
-             const cacheData = data => {
-               // Bunch of nested single value arrays of objects
-               const [ cat = {items:[]} ] = data.categories;
-               const [ item = {class:[]} ] = cat.items;
-               const [ cl = null ] = item.class;
+           if (isClosed && (nodes.length === 1 || nodes[0] !== nodes[nodes.length - 1])) {
+             nodes.push(nodes[0]);
+           }
 
-               // If null default value is reached, data wasn't as expected (or was empty)
-               if (!cl) {
-                 /* eslint-disable no-console */
-                 console.log(`Osmose strings request (${itemType}) had unexpected data`);
-                 /* eslint-enable no-console */
-                 return;
-               }
+           return this.update({
+             nodes: nodes
+           });
+         },
+         // Replaces the node which is currently at position index with the given node (id).
+         // Consecutive duplicates are eliminated including existing ones.
+         // Circularity is preserved when updating a node.
+         updateNode: function updateNode(id, index) {
+           var nodes = this.nodes.slice();
+           var isClosed = this.isClosed();
+           var max = nodes.length - 1;
 
-               // Cache served item colors to automatically style issue markers later
-               const { item: itemInt, color } = item;
-               if (/^#[A-Fa-f0-9]{6}|[A-Fa-f0-9]{3}/.test(color)) {
-                 _cache$2.colors[itemInt] = color;
-               }
+           if (index === undefined || index < 0 || index > max) {
+             throw new RangeError('index ' + index + ' out of range 0..' + max);
+           } // If this is a closed way, remove all connector nodes except the first one
+           // (there may be duplicates) and adjust index if necessary..
 
-               // Value of root key will be null if no string exists
-               // If string exists, value is an object with key 'auto' for string
-               const { title, detail, fix, trap } = cl;
 
-               // Osmose titles shouldn't contain markdown
-               let issueStrings = {};
-               if (title) issueStrings.title = title.auto;
-               if (detail) issueStrings.detail = marked_1(detail.auto);
-               if (trap) issueStrings.trap = marked_1(trap.auto);
-               if (fix) issueStrings.fix = marked_1(fix.auto);
+           if (isClosed) {
+             var connector = this.first(); // leading connectors..
 
-               _cache$2.strings[locale][itemType] = issueStrings;
-             };
+             var i = 1;
 
-             const [ item, cl ] = itemType.split('-');
+             while (i < nodes.length && nodes.length > 2 && nodes[i] === connector) {
+               nodes.splice(i, 1);
+               if (index > i) index--;
+             } // trailing connectors..
 
-             // Osmose API falls back to English strings where untranslated or if locale doesn't exist
-             const url = `${_osmoseUrlRoot}/items/${item}/class/${cl}?langs=${locale}`;
 
-             return d3_json(url).then(cacheData);
-           });
+             i = nodes.length - 1;
 
-           return Promise.all(allRequests).then(() => _cache$2.strings[locale]);
-         },
+             while (i > 0 && nodes.length > 1 && nodes[i] === connector) {
+               nodes.splice(i, 1);
+               if (index === i) index = 0; // update leading connector instead
 
-         getStrings(itemType, locale=_mainLocalizer.localeCode()) {
-           // No need to fallback to English, Osmose API handles this for us
-           return (locale in _cache$2.strings) ? _cache$2.strings[locale][itemType] : {};
-         },
+               i = nodes.length - 1;
+             }
+           }
 
-         getColor(itemType) {
-           return (itemType in _cache$2.colors) ? _cache$2.colors[itemType] : '#FFFFFF';
-         },
+           nodes.splice(index, 1, id);
+           nodes = nodes.filter(noRepeatNodes); // If the way was closed before, append a connector node to keep it closed..
 
-         postUpdate(issue, callback) {
-           if (_cache$2.inflightPost[issue.id]) {
-             return callback({ message: 'Issue update already inflight', status: -2 }, issue);
+           if (isClosed && (nodes.length === 1 || nodes[0] !== nodes[nodes.length - 1])) {
+             nodes.push(nodes[0]);
            }
 
-           // UI sets the status to either 'done' or 'false'
-           const url = `${_osmoseUrlRoot}/issue/${issue.id}/${issue.newStatus}`;
-           const controller = new AbortController();
-           const after = () => {
-             delete _cache$2.inflightPost[issue.id];
+           return this.update({
+             nodes: nodes
+           });
+         },
+         // Replaces each occurrence of node id needle with replacement.
+         // Consecutive duplicates are eliminated including existing ones.
+         // Circularity is preserved.
+         replaceNode: function replaceNode(needleID, replacementID) {
+           var nodes = this.nodes.slice();
+           var isClosed = this.isClosed();
 
-             this.removeItem(issue);
-             if (issue.newStatus === 'done') {
-               // Keep track of the number of issues closed per `item` to tag the changeset
-               if (!(issue.item in _cache$2.closed)) {
-                 _cache$2.closed[issue.item] = 0;
-               }
-               _cache$2.closed[issue.item] += 1;
+           for (var i = 0; i < nodes.length; i++) {
+             if (nodes[i] === needleID) {
+               nodes[i] = replacementID;
              }
-             if (callback) callback(null, issue);
-           };
+           }
 
-           _cache$2.inflightPost[issue.id] = controller;
+           nodes = nodes.filter(noRepeatNodes); // If the way was closed before, append a connector node to keep it closed..
 
-           fetch(url, { signal: controller.signal })
-             .then(after)
-             .catch(err => {
-               delete _cache$2.inflightPost[issue.id];
-               if (callback) callback(err.message);
-             });
+           if (isClosed && (nodes.length === 1 || nodes[0] !== nodes[nodes.length - 1])) {
+             nodes.push(nodes[0]);
+           }
+
+           return this.update({
+             nodes: nodes
+           });
+         },
+         // Removes each occurrence of node id.
+         // Consecutive duplicates are eliminated including existing ones.
+         // Circularity is preserved.
+         removeNode: function removeNode(id) {
+           var nodes = this.nodes.slice();
+           var isClosed = this.isClosed();
+           nodes = nodes.filter(function (node) {
+             return node !== id;
+           }).filter(noRepeatNodes); // If the way was closed before, append a connector node to keep it closed..
+
+           if (isClosed && (nodes.length === 1 || nodes[0] !== nodes[nodes.length - 1])) {
+             nodes.push(nodes[0]);
+           }
+
+           return this.update({
+             nodes: nodes
+           });
          },
+         asJXON: function asJXON(changeset_id) {
+           var r = {
+             way: {
+               '@id': this.osmId(),
+               '@version': this.version || 0,
+               nd: this.nodes.map(function (id) {
+                 return {
+                   keyAttributes: {
+                     ref: osmEntity.id.toOSM(id)
+                   }
+                 };
+               }, this),
+               tag: Object.keys(this.tags).map(function (k) {
+                 return {
+                   keyAttributes: {
+                     k: k,
+                     v: this.tags[k]
+                   }
+                 };
+               }, this)
+             }
+           };
 
-         // Get all cached QAItems covering the viewport
-         getItems(projection) {
-           const viewport = projection.clipExtent();
-           const min = [viewport[0][0], viewport[1][1]];
-           const max = [viewport[1][0], viewport[0][1]];
-           const bbox = geoExtent(projection.invert(min), projection.invert(max)).bbox();
+           if (changeset_id) {
+             r.way['@changeset'] = changeset_id;
+           }
 
-           return _cache$2.rtree.search(bbox).map(d => d.data);
+           return r;
          },
+         asGeoJSON: function asGeoJSON(resolver) {
+           return resolver["transient"](this, 'GeoJSON', function () {
+             var coordinates = resolver.childNodes(this).map(function (n) {
+               return n.loc;
+             });
 
-         // Get a QAItem from cache
-         // NOTE: Don't change method name until UI v3 is merged
-         getError(id) {
-           return _cache$2.data[id];
+             if (this.isArea() && this.isClosed()) {
+               return {
+                 type: 'Polygon',
+                 coordinates: [coordinates]
+               };
+             } else {
+               return {
+                 type: 'LineString',
+                 coordinates: coordinates
+               };
+             }
+           });
          },
+         area: function area(resolver) {
+           return resolver["transient"](this, 'area', function () {
+             var nodes = resolver.childNodes(this);
+             var json = {
+               type: 'Polygon',
+               coordinates: [nodes.map(function (n) {
+                 return n.loc;
+               })]
+             };
 
-         // get the name of the icon to display for this item
-         getIcon(itemType) {
-           return _osmoseData.icons[itemType];
-         },
+             if (!this.isClosed() && nodes.length) {
+               json.coordinates[0].push(nodes[0].loc);
+             }
 
-         // Replace a single QAItem in the cache
-         replaceItem(item) {
-           if (!(item instanceof QAItem) || !item.id) return;
+             var area = d3_geoArea(json); // Heuristic for detecting counterclockwise winding order. Assumes
+             // that OpenStreetMap polygons are not hemisphere-spanning.
 
-           _cache$2.data[item.id] = item;
-           updateRtree$2(encodeIssueRtree$2(item), true); // true = replace
-           return item;
-         },
+             if (area > 2 * Math.PI) {
+               json.coordinates[0] = json.coordinates[0].reverse();
+               area = d3_geoArea(json);
+             }
 
-         // Remove a single QAItem from the cache
-         removeItem(item) {
-           if (!(item instanceof QAItem) || !item.id) return;
+             return isNaN(area) ? 0 : area;
+           });
+         }
+       }); // Filter function to eliminate consecutive duplicates.
 
-           delete _cache$2.data[item.id];
-           updateRtree$2(encodeIssueRtree$2(item), false); // false = remove
-         },
+       function noRepeatNodes(node, i, arr) {
+         return i === 0 || node !== arr[i - 1];
+       }
 
-         // Used to populate `closed:osmose:*` changeset tags
-         getClosedCounts() {
-           return _cache$2.closed;
-         },
+       //
+       // 1. Relation tagged with `type=multipolygon` and no interesting tags.
+       // 2. One and only one member with the `outer` role. Must be a way with interesting tags.
+       // 3. No members without a role.
+       //
+       // Old multipolygons are no longer recommended but are still rendered as areas by iD.
 
-         itemURL(item) {
-           return `https://osmose.openstreetmap.fr/en/error/${item.id}`;
+       function osmOldMultipolygonOuterMemberOfRelation(entity, graph) {
+         if (entity.type !== 'relation' || !entity.isMultipolygon() || Object.keys(entity.tags).filter(osmIsInterestingTag).length > 1) {
+           return false;
          }
-       };
 
-       /*
-           A standalone SVG element that contains only a `defs` sub-element. To be
-           used once globally, since defs IDs must be unique within a document.
-       */
-       function svgDefs(context) {
+         var outerMember;
 
-           function drawDefs(selection) {
-               var defs = selection.append('defs');
-
-               // add markers
-               defs
-                   .append('marker')
-                   .attr('id', 'ideditor-oneway-marker')
-                   .attr('viewBox', '0 0 10 5')
-                   .attr('refX', 2.5)
-                   .attr('refY', 2.5)
-                   .attr('markerWidth', 2)
-                   .attr('markerHeight', 2)
-                   .attr('markerUnits', 'strokeWidth')
-                   .attr('orient', 'auto')
-                   .append('path')
-                   .attr('class', 'oneway-marker-path')
-                   .attr('d', 'M 5,3 L 0,3 L 0,2 L 5,2 L 5,0 L 10,2.5 L 5,5 z')
-                   .attr('stroke', 'none')
-                   .attr('fill', '#000')
-                   .attr('opacity', '0.75');
-
-               // SVG markers have to be given a colour where they're defined
-               // (they can't inherit it from the line they're attached to),
-               // so we need to manually define markers for each color of tag
-               // (also, it's slightly nicer if we can control the
-               // positioning for different tags)
-               function addSidedMarker(name, color, offset) {
-                   defs
-                       .append('marker')
-                       .attr('id', 'ideditor-sided-marker-' + name)
-                       .attr('viewBox', '0 0 2 2')
-                       .attr('refX', 1)
-                       .attr('refY', -offset)
-                       .attr('markerWidth', 1.5)
-                       .attr('markerHeight', 1.5)
-                       .attr('markerUnits', 'strokeWidth')
-                       .attr('orient', 'auto')
-                       .append('path')
-                       .attr('class', 'sided-marker-path sided-marker-' + name + '-path')
-                       .attr('d', 'M 0,0 L 1,1 L 2,0 z')
-                       .attr('stroke', 'none')
-                       .attr('fill', color);
-               }
-               addSidedMarker('natural', 'rgb(170, 170, 170)', 0);
-               // for a coastline, the arrows are (somewhat unintuitively) on
-               // the water side, so let's color them blue (with a gap) to
-               // give a stronger indication
-               addSidedMarker('coastline', '#77dede', 1);
-               addSidedMarker('waterway', '#77dede', 1);
-               // barriers have a dashed line, and separating the triangle
-               // from the line visually suits that
-               addSidedMarker('barrier', '#ddd', 1);
-               addSidedMarker('man_made', '#fff', 0);
-
-               defs
-                   .append('marker')
-                   .attr('id', 'ideditor-viewfield-marker')
-                   .attr('viewBox', '0 0 16 16')
-                   .attr('refX', 8)
-                   .attr('refY', 16)
-                   .attr('markerWidth', 4)
-                   .attr('markerHeight', 4)
-                   .attr('markerUnits', 'strokeWidth')
-                   .attr('orient', 'auto')
-                   .append('path')
-                   .attr('class', 'viewfield-marker-path')
-                   .attr('d', 'M 6,14 C 8,13.4 8,13.4 10,14 L 16,3 C 12,0 4,0 0,3 z')
-                   .attr('fill', '#333')
-                   .attr('fill-opacity', '0.75')
-                   .attr('stroke', '#fff')
-                   .attr('stroke-width', '0.5px')
-                   .attr('stroke-opacity', '0.75');
-
-               defs
-                   .append('marker')
-                   .attr('id', 'ideditor-viewfield-marker-wireframe')
-                   .attr('viewBox', '0 0 16 16')
-                   .attr('refX', 8)
-                   .attr('refY', 16)
-                   .attr('markerWidth', 4)
-                   .attr('markerHeight', 4)
-                   .attr('markerUnits', 'strokeWidth')
-                   .attr('orient', 'auto')
-                   .append('path')
-                   .attr('class', 'viewfield-marker-path')
-                   .attr('d', 'M 6,14 C 8,13.4 8,13.4 10,14 L 16,3 C 12,0 4,0 0,3 z')
-                   .attr('fill', 'none')
-                   .attr('stroke', '#fff')
-                   .attr('stroke-width', '0.5px')
-                   .attr('stroke-opacity', '0.75');
-
-               // add patterns
-               var patterns = defs.selectAll('pattern')
-                   .data([
-                       // pattern name, pattern image name
-                       ['beach', 'dots'],
-                       ['construction', 'construction'],
-                       ['cemetery', 'cemetery'],
-                       ['cemetery_christian', 'cemetery_christian'],
-                       ['cemetery_buddhist', 'cemetery_buddhist'],
-                       ['cemetery_muslim', 'cemetery_muslim'],
-                       ['cemetery_jewish', 'cemetery_jewish'],
-                       ['farmland', 'farmland'],
-                       ['farmyard', 'farmyard'],
-                       ['forest', 'forest'],
-                       ['forest_broadleaved', 'forest_broadleaved'],
-                       ['forest_needleleaved', 'forest_needleleaved'],
-                       ['forest_leafless', 'forest_leafless'],
-                       ['golf_green', 'grass'],
-                       ['grass', 'grass'],
-                       ['landfill', 'landfill'],
-                       ['meadow', 'grass'],
-                       ['orchard', 'orchard'],
-                       ['pond', 'pond'],
-                       ['quarry', 'quarry'],
-                       ['scrub', 'bushes'],
-                       ['vineyard', 'vineyard'],
-                       ['water_standing', 'lines'],
-                       ['waves', 'waves'],
-                       ['wetland', 'wetland'],
-                       ['wetland_marsh', 'wetland_marsh'],
-                       ['wetland_swamp', 'wetland_swamp'],
-                       ['wetland_bog', 'wetland_bog'],
-                       ['wetland_reedbed', 'wetland_reedbed']
-                   ])
-                   .enter()
-                   .append('pattern')
-                   .attr('id', function (d) { return 'ideditor-pattern-' + d[0]; })
-                   .attr('width', 32)
-                   .attr('height', 32)
-                   .attr('patternUnits', 'userSpaceOnUse');
-
-               patterns
-                   .append('rect')
-                   .attr('x', 0)
-                   .attr('y', 0)
-                   .attr('width', 32)
-                   .attr('height', 32)
-                   .attr('class', function (d) { return 'pattern-color-' + d[0]; });
-
-               patterns
-                   .append('image')
-                   .attr('x', 0)
-                   .attr('y', 0)
-                   .attr('width', 32)
-                   .attr('height', 32)
-                   .attr('xlink:href', function (d) {
-                       return context.imagePath('pattern/' + d[1] + '.png');
-                   });
+         for (var memberIndex in entity.members) {
+           var member = entity.members[memberIndex];
 
-               // add clip paths
-               defs.selectAll('clipPath')
-                   .data([12, 18, 20, 32, 45])
-                   .enter()
-                   .append('clipPath')
-                   .attr('id', function (d) { return 'ideditor-clip-square-' + d; })
-                   .append('rect')
-                   .attr('x', 0)
-                   .attr('y', 0)
-                   .attr('width', function (d) { return d; })
-                   .attr('height', function (d) { return d; });
+           if (!member.role || member.role === 'outer') {
+             if (outerMember) return false;
+             if (member.type !== 'way') return false;
+             if (!graph.hasEntity(member.id)) return false;
+             outerMember = graph.entity(member.id);
 
-               // add symbol spritesheets
-               defs
-                   .call(drawDefs.addSprites, [
-                       'iD-sprite', 'maki-sprite', 'temaki-sprite', 'fa-sprite', 'tnp-sprite', 'community-sprite'
-                   ], true);
+             if (Object.keys(outerMember.tags).filter(osmIsInterestingTag).length === 0) {
+               return false;
+             }
            }
+         }
 
+         return outerMember;
+       } // For fixing up rendering of multipolygons with tags on the outer member.
+       // https://github.com/openstreetmap/iD/issues/613
 
-           drawDefs.addSprites = function(selection, ids, overrideColors) {
-               var spritesheets = selection.selectAll('.spritesheet');
-               var currData = spritesheets.data();
-               var data = utilArrayUniq(currData.concat(ids));
+       function osmIsOldMultipolygonOuterMember(entity, graph) {
+         if (entity.type !== 'way' || Object.keys(entity.tags).filter(osmIsInterestingTag).length === 0) return false;
+         var parents = graph.parentRelations(entity);
+         if (parents.length !== 1) return false;
+         var parent = parents[0];
+         if (!parent.isMultipolygon() || Object.keys(parent.tags).filter(osmIsInterestingTag).length > 1) return false;
+         var members = parent.members,
+             member;
 
-               spritesheets
-                   .data(data)
-                   .enter()
-                   .append('g')
-                   .attr('class', function(d) { return 'spritesheet spritesheet-' + d; })
-                   .each(function(d) {
-                       var url = context.imagePath(d + '.svg');
-                       var node = select(this).node();
-
-                       svg(url)
-                           .then(function(svg) {
-                               node.appendChild(
-                                   select(svg.documentElement).attr('id', 'ideditor-' + d).node()
-                               );
-                               if (overrideColors && d !== 'iD-sprite') {   // allow icon colors to be overridden..
-                                   select(node).selectAll('path')
-                                       .attr('fill', 'currentColor');
-                               }
-                           })
-                           .catch(function() {
-                               /* ignore */
-                           });
-                   });
-           };
+         for (var i = 0; i < members.length; i++) {
+           member = members[i];
+           if (member.id === entity.id && member.role && member.role !== 'outer') return false; // Not outer member
 
+           if (member.id !== entity.id && (!member.role || member.role === 'outer')) return false; // Not a simple multipolygon
+         }
 
-           return drawDefs;
+         return parent;
        }
+       function osmOldMultipolygonOuterMember(entity, graph) {
+         if (entity.type !== 'way') return false;
+         var parents = graph.parentRelations(entity);
+         if (parents.length !== 1) return false;
+         var parent = parents[0];
+         if (!parent.isMultipolygon() || Object.keys(parent.tags).filter(osmIsInterestingTag).length > 1) return false;
+         var members = parent.members,
+             member,
+             outerMember;
 
-       /* global Mapillary:false */
-
-
-       var apibase = 'https://a.mapillary.com/v3/';
-       var viewercss = 'mapillary-js/mapillary.min.css';
-       var viewerjs = 'mapillary-js/mapillary.min.js';
-       var clientId = 'NzNRM2otQkR2SHJzaXJmNmdQWVQ0dzo1ZWYyMmYwNjdmNDdlNmVi';
-       var mapFeatureConfig = {
-           values: [
-               'construction--flat--crosswalk-plain',
-               'marking--discrete--crosswalk-zebra',
-               'object--banner',
-               'object--bench',
-               'object--bike-rack',
-               'object--billboard',
-               'object--catch-basin',
-               'object--cctv-camera',
-               'object--fire-hydrant',
-               'object--mailbox',
-               'object--manhole',
-               'object--phone-booth',
-               'object--sign--advertisement',
-               'object--sign--information',
-               'object--sign--store',
-               'object--street-light',
-               'object--support--utility-pole',
-               'object--traffic-light--*',
-               'object--traffic-light--pedestrians',
-               'object--trash-can'
-           ].join(',')
-       };
-       var maxResults = 1000;
-       var tileZoom = 14;
-       var tiler$3 = utilTiler().zoomExtent([tileZoom, tileZoom]).skipNullIsland(true);
-       var dispatch$4 = dispatch('loadedImages', 'loadedSigns', 'loadedMapFeatures', 'bearingChanged');
-       var _mlyFallback = false;
-       var _mlyCache;
-       var _mlyClicks;
-       var _mlySelectedImageKey;
-       var _mlyViewer;
-
-
-       function abortRequest$3(controller) {
-           controller.abort();
-       }
+         for (var i = 0; i < members.length; i++) {
+           member = members[i];
 
+           if (!member.role || member.role === 'outer') {
+             if (outerMember) return false; // Not a simple multipolygon
 
-       function maxPageAtZoom(z) {
-           if (z < 15)   return 2;
-           if (z === 15) return 5;
-           if (z === 16) return 10;
-           if (z === 17) return 20;
-           if (z === 18) return 40;
-           if (z > 18)   return 80;
-       }
+             outerMember = member;
+           }
+         }
 
+         if (!outerMember) return false;
+         var outerEntity = graph.hasEntity(outerMember.id);
+         if (!outerEntity || !Object.keys(outerEntity.tags).filter(osmIsInterestingTag).length) return false;
+         return outerEntity;
+       } // Join `toJoin` array into sequences of connecting ways.
+       // Segments which share identical start/end nodes will, as much as possible,
+       // be connected with each other.
+       //
+       // The return value is a nested array. Each constituent array contains elements
+       // of `toJoin` which have been determined to connect.
+       //
+       // Each consitituent array also has a `nodes` property whose value is an
+       // ordered array of member nodes, with appropriate order reversal and
+       // start/end coordinate de-duplication.
+       //
+       // Members of `toJoin` must have, at minimum, `type` and `id` properties.
+       // Thus either an array of `osmWay`s or a relation member array may be used.
+       //
+       // If an member is an `osmWay`, its tags and childnodes may be reversed via
+       // `actionReverse` in the output.
+       //
+       // The returned sequences array also has an `actions` array property, containing
+       // any reversal actions that should be applied to the graph, should the calling
+       // code attempt to actually join the given ways.
+       //
+       // Incomplete members (those for which `graph.hasEntity(element.id)` returns
+       // false) and non-way members are ignored.
+       //
 
-       function loadTiles(which, url, projection) {
-           var currZoom = Math.floor(geoScaleToZoom(projection.scale()));
-           var tiles = tiler$3.getTiles(projection);
+       function osmJoinWays(toJoin, graph) {
+         function resolve(member) {
+           return graph.childNodes(graph.entity(member.id));
+         }
 
-           // abort inflight requests that are no longer needed
-           var cache = _mlyCache[which];
-           Object.keys(cache.inflight).forEach(function(k) {
-               var wanted = tiles.find(function(tile) { return k.indexOf(tile.id + ',') === 0; });
-               if (!wanted) {
-                   abortRequest$3(cache.inflight[k]);
-                   delete cache.inflight[k];
-               }
+         function reverse(item) {
+           var action = actionReverse(item.id, {
+             reverseOneway: true
            });
+           sequences.actions.push(action);
+           return item instanceof osmWay ? action(graph).entity(item.id) : item;
+         } // make a copy containing only the items to join
 
-           tiles.forEach(function(tile) {
-               loadNextTilePage(which, currZoom, url, tile);
-           });
-       }
 
+         toJoin = toJoin.filter(function (member) {
+           return member.type === 'way' && graph.hasEntity(member.id);
+         }); // Are the things we are joining relation members or `osmWays`?
+         // If `osmWays`, skip the "prefer a forward path" code below (see #4872)
 
-       function loadNextTilePage(which, currZoom, url, tile) {
-           var cache = _mlyCache[which];
-           var rect = tile.extent.rectangle();
-           var maxPages = maxPageAtZoom(currZoom);
-           var nextPage = cache.nextPage[tile.id] || 0;
-           var nextURL = cache.nextURL[tile.id] || url +
-               utilQsString({
-                   per_page: maxResults,
-                   page: nextPage,
-                   client_id: clientId,
-                   bbox: [rect[0], rect[1], rect[2], rect[3]].join(','),
-               });
+         var i;
+         var joinAsMembers = true;
 
-           if (nextPage > maxPages) return;
+         for (i = 0; i < toJoin.length; i++) {
+           if (toJoin[i] instanceof osmWay) {
+             joinAsMembers = false;
+             break;
+           }
+         }
 
-           var id = tile.id + ',' + String(nextPage);
-           if (cache.loaded[id] || cache.inflight[id]) return;
+         var sequences = [];
+         sequences.actions = [];
 
-           var controller = new AbortController();
-           cache.inflight[id] = controller;
+         while (toJoin.length) {
+           // start a new sequence
+           var item = toJoin.shift();
+           var currWays = [item];
+           var currNodes = resolve(item).slice(); // add to it
 
-           var options = {
-               method: 'GET',
-               signal: controller.signal,
-               headers: { 'Content-Type': 'application/json' }
-           };
+           while (toJoin.length) {
+             var start = currNodes[0];
+             var end = currNodes[currNodes.length - 1];
+             var fn = null;
+             var nodes = null; // Find the next way/member to join.
+
+             for (i = 0; i < toJoin.length; i++) {
+               item = toJoin[i];
+               nodes = resolve(item); // (for member ordering only, not way ordering - see #4872)
+               // Strongly prefer to generate a forward path that preserves the order
+               // of the members array. For multipolygons and most relations, member
+               // order does not matter - but for routes, it does. (see #4589)
+               // If we started this sequence backwards (i.e. next member way attaches to
+               // the start node and not the end node), reverse the initial way before continuing.
+
+               if (joinAsMembers && currWays.length === 1 && nodes[0] !== end && nodes[nodes.length - 1] !== end && (nodes[nodes.length - 1] === start || nodes[0] === start)) {
+                 currWays[0] = reverse(currWays[0]);
+                 currNodes.reverse();
+                 start = currNodes[0];
+                 end = currNodes[currNodes.length - 1];
+               }
+
+               if (nodes[0] === end) {
+                 fn = currNodes.push; // join to end
+
+                 nodes = nodes.slice(1);
+                 break;
+               } else if (nodes[nodes.length - 1] === end) {
+                 fn = currNodes.push; // join to end
 
-           fetch(nextURL, options)
-               .then(function(response) {
-                   if (!response.ok) {
-                       throw new Error(response.status + ' ' + response.statusText);
-                   }
-                   var linkHeader = response.headers.get('Link');
-                   if (linkHeader) {
-                       var pagination = parsePagination(linkHeader);
-                       if (pagination.next) {
-                           cache.nextURL[tile.id] = pagination.next;
-                       }
-                   }
-                   return response.json();
-               })
-               .then(function(data) {
-                   cache.loaded[id] = true;
-                   delete cache.inflight[id];
-                   if (!data || !data.features || !data.features.length) {
-                       throw new Error('No Data');
-                   }
+                 nodes = nodes.slice(0, -1).reverse();
+                 item = reverse(item);
+                 break;
+               } else if (nodes[nodes.length - 1] === start) {
+                 fn = currNodes.unshift; // join to beginning
 
-                   var features = data.features.map(function(feature) {
-                       var loc = feature.geometry.coordinates;
-                       var d;
-
-                       // An image (shown as a green dot on the map) is a single street photo with extra
-                       // information such as location, camera angle (CA), camera model, and so on.
-                       // Each image feature is a GeoJSON Point
-                       if (which === 'images') {
-                           d = {
-                               loc: loc,
-                               key: feature.properties.key,
-                               ca: feature.properties.ca,
-                               captured_at: feature.properties.captured_at,
-                               captured_by: feature.properties.username,
-                               pano: feature.properties.pano
-                           };
-
-                           cache.forImageKey[d.key] = d;     // cache imageKey -> image
-
-                       // Mapillary organizes images as sequences. A sequence of images are continuously captured
-                       // by a user at a give time. Sequences are shown on the map as green lines.
-                       // Each sequence feature is a GeoJSON LineString
-                       } else if (which === 'sequences') {
-                           var sequenceKey = feature.properties.key;
-                           cache.lineString[sequenceKey] = feature;           // cache sequenceKey -> lineString
-                           feature.properties.coordinateProperties.image_keys.forEach(function(imageKey) {
-                               cache.forImageKey[imageKey] = sequenceKey;     // cache imageKey -> sequenceKey
-                           });
-                           return false;    // because no `d` data worth loading into an rbush
-
-                       // An image detection is a semantic pixel area on an image. The area could indicate
-                       // sky, trees, sidewalk in the image. A detection can be a polygon, a bounding box, or a point.
-                       // Each image_detection feature is a GeoJSON Point (located where the image was taken)
-                       } else if (which === 'image_detections') {
-                           d = {
-                               key: feature.properties.key,
-                               image_key: feature.properties.image_key,
-                               value: feature.properties.value,
-                               package: feature.properties.package,
-                               shape: feature.properties.shape
-                           };
-
-                           // cache imageKey -> image_detections
-                           if (!cache.forImageKey[d.image_key]) {
-                               cache.forImageKey[d.image_key] = [];
-                           }
-                           cache.forImageKey[d.image_key].push(d);
-                           return false;    // because no `d` data worth loading into an rbush
-
-
-                       // A map feature is a real world object that can be shown on a map. It could be any object
-                       // recognized from images, manually added in images, or added on the map.
-                       // Each map feature is a GeoJSON Point (located where the feature is)
-                       } else if (which === 'map_features' || which === 'points') {
-                           d = {
-                               loc: loc,
-                               key: feature.properties.key,
-                               value: feature.properties.value,
-                               package: feature.properties.package,
-                               detections: feature.properties.detections
-                           };
-                       }
+                 nodes = nodes.slice(0, -1);
+                 break;
+               } else if (nodes[0] === start) {
+                 fn = currNodes.unshift; // join to beginning
 
-                       return {
-                           minX: loc[0], minY: loc[1], maxX: loc[0], maxY: loc[1], data: d
-                       };
+                 nodes = nodes.slice(1).reverse();
+                 item = reverse(item);
+                 break;
+               } else {
+                 fn = nodes = null;
+               }
+             }
 
-                   }).filter(Boolean);
+             if (!nodes) {
+               // couldn't find a joinable way/member
+               break;
+             }
 
-                   if (cache.rtree && features) {
-                       cache.rtree.load(features);
-                   }
+             fn.apply(currWays, [item]);
+             fn.apply(currNodes, nodes);
+             toJoin.splice(i, 1);
+           }
 
-                   if (data.features.length === maxResults) {  // more pages to load
-                       cache.nextPage[tile.id] = nextPage + 1;
-                       loadNextTilePage(which, currZoom, url, tile);
-                   } else {
-                       cache.nextPage[tile.id] = Infinity;     // no more pages to load
-                   }
+           currWays.nodes = currNodes;
+           sequences.push(currWays);
+         }
 
-                   if (which === 'images' || which === 'sequences') {
-                       dispatch$4.call('loadedImages');
-                   } else if (which === 'map_features') {
-                       dispatch$4.call('loadedSigns');
-                   } else if (which === 'points') {
-                       dispatch$4.call('loadedMapFeatures');
-                   }
-               })
-               .catch(function() {
-                   cache.loaded[id] = true;
-                   delete cache.inflight[id];
-               });
+         return sequences;
        }
 
-       // extract links to pages of API results
-       function parsePagination(links) {
-           return links.split(',').map(function(rel) {
-               var elements = rel.split(';');
-               if (elements.length === 2) {
-                   return [
-                       /<(.+)>/.exec(elements[0])[1],
-                       /rel="(.+)"/.exec(elements[1])[1]
-                   ];
-               } else {
-                   return ['',''];
-               }
-           }).reduce(function(pagination, val) {
-               pagination[val[1]] = val[0];
-               return pagination;
-           }, {});
-       }
+       function actionAddMember(relationId, member, memberIndex, insertPair) {
+         return function action(graph) {
+           var relation = graph.entity(relationId); // There are some special rules for Public Transport v2 routes.
 
+           var isPTv2 = /stop|platform/.test(member.role);
 
-       // partition viewport into higher zoom tiles
-       function partitionViewport(projection) {
-           var z = geoScaleToZoom(projection.scale());
-           var z2 = (Math.ceil(z * 2) / 2) + 2.5;   // round to next 0.5 and add 2.5
-           var tiler = utilTiler().zoomExtent([z2, z2]);
+           if ((isNaN(memberIndex) || insertPair) && member.type === 'way' && !isPTv2) {
+             // Try to perform sensible inserts based on how the ways join together
+             graph = addWayMember(relation, graph);
+           } else {
+             // see https://wiki.openstreetmap.org/wiki/Public_transport#Service_routes
+             // Stops and Platforms for PTv2 should be ordered first.
+             // hack: We do not currently have the ability to place them in the exactly correct order.
+             if (isPTv2 && isNaN(memberIndex)) {
+               memberIndex = 0;
+             }
 
-           return tiler.getTiles(projection)
-               .map(function(tile) { return tile.extent; });
-       }
+             graph = graph.replace(relation.addMember(member, memberIndex));
+           }
 
+           return graph;
+         }; // Add a way member into the relation "wherever it makes sense".
+         // In this situation we were not supplied a memberIndex.
 
-       // no more than `limit` results per partition.
-       function searchLimited(limit, projection, rtree) {
-           limit = limit || 5;
+         function addWayMember(relation, graph) {
+           var groups, tempWay, item, i, j, k; // remove PTv2 stops and platforms before doing anything.
 
-           return partitionViewport(projection)
-               .reduce(function(result, extent) {
-                   var found = rtree.search(extent.bbox())
-                       .slice(0, limit)
-                       .map(function(d) { return d.data; });
+           var PTv2members = [];
+           var members = [];
 
-                   return (found.length ? result.concat(found) : result);
-               }, []);
-       }
+           for (i = 0; i < relation.members.length; i++) {
+             var m = relation.members[i];
 
+             if (/stop|platform/.test(m.role)) {
+               PTv2members.push(m);
+             } else {
+               members.push(m);
+             }
+           }
 
+           relation = relation.update({
+             members: members
+           });
 
-       var serviceMapillary = {
+           if (insertPair) {
+             // We're adding a member that must stay paired with an existing member.
+             // (This feature is used by `actionSplit`)
+             //
+             // This is tricky because the members may exist multiple times in the
+             // member list, and with different A-B/B-A ordering and different roles.
+             // (e.g. a bus route that loops out and back - #4589).
+             //
+             // Replace the existing member with a temporary way,
+             // so that `osmJoinWays` can treat the pair like a single way.
+             tempWay = osmWay({
+               id: 'wTemp',
+               nodes: insertPair.nodes
+             });
+             graph = graph.replace(tempWay);
+             var tempMember = {
+               id: tempWay.id,
+               type: 'way',
+               role: member.role
+             };
+             var tempRelation = relation.replaceMember({
+               id: insertPair.originalID
+             }, tempMember, true);
+             groups = utilArrayGroupBy(tempRelation.members, 'type');
+             groups.way = groups.way || [];
+           } else {
+             // Add the member anywhere, one time. Just push and let `osmJoinWays` decide where to put it.
+             groups = utilArrayGroupBy(relation.members, 'type');
+             groups.way = groups.way || [];
+             groups.way.push(member);
+           }
 
-           init: function() {
-               if (!_mlyCache) {
-                   this.reset();
-               }
+           members = withIndex(groups.way);
+           var joined = osmJoinWays(members, graph); // `joined` might not contain all of the way members,
+           // But will contain only the completed (downloaded) members
 
-               this.event = utilRebind(this, dispatch$4, 'on');
-           },
+           for (i = 0; i < joined.length; i++) {
+             var segment = joined[i];
+             var nodes = segment.nodes.slice();
+             var startIndex = segment[0].index; // j = array index in `members` where this segment starts
 
-           reset: function() {
-               if (_mlyCache) {
-                   Object.values(_mlyCache.images.inflight).forEach(abortRequest$3);
-                   Object.values(_mlyCache.image_detections.inflight).forEach(abortRequest$3);
-                   Object.values(_mlyCache.map_features.inflight).forEach(abortRequest$3);
-                   Object.values(_mlyCache.points.inflight).forEach(abortRequest$3);
-                   Object.values(_mlyCache.sequences.inflight).forEach(abortRequest$3);
-               }
-
-               _mlyCache = {
-                   images: { inflight: {}, loaded: {}, nextPage: {}, nextURL: {}, rtree: new RBush(), forImageKey: {} },
-                   image_detections: { inflight: {}, loaded: {}, nextPage: {}, nextURL: {}, forImageKey: {} },
-                   map_features: { inflight: {}, loaded: {}, nextPage: {}, nextURL: {}, rtree: new RBush() },
-                   points: { inflight: {}, loaded: {}, nextPage: {}, nextURL: {}, rtree: new RBush() },
-                   sequences: { inflight: {}, loaded: {}, nextPage: {}, nextURL: {}, rtree: new RBush(), forImageKey: {}, lineString: {} }
-               };
+             for (j = 0; j < members.length; j++) {
+               if (members[j].index === startIndex) {
+                 break;
+               }
+             } // k = each member in segment
 
-               _mlySelectedImageKey = null;
-               _mlyClicks = [];
-           },
 
+             for (k = 0; k < segment.length; k++) {
+               item = segment[k];
+               var way = graph.entity(item.id); // If this is a paired item, generate members in correct order and role
 
-           images: function(projection) {
-               var limit = 5;
-               return searchLimited(limit, projection, _mlyCache.images.rtree);
-           },
+               if (tempWay && item.id === tempWay.id) {
+                 if (nodes[0].id === insertPair.nodes[0]) {
+                   item.pair = [{
+                     id: insertPair.originalID,
+                     type: 'way',
+                     role: item.role
+                   }, {
+                     id: insertPair.insertedID,
+                     type: 'way',
+                     role: item.role
+                   }];
+                 } else {
+                   item.pair = [{
+                     id: insertPair.insertedID,
+                     type: 'way',
+                     role: item.role
+                   }, {
+                     id: insertPair.originalID,
+                     type: 'way',
+                     role: item.role
+                   }];
+                 }
+               } // reorder `members` if necessary
 
 
-           signs: function(projection) {
-               var limit = 5;
-               return searchLimited(limit, projection, _mlyCache.map_features.rtree);
-           },
+               if (k > 0) {
+                 if (j + k >= members.length || item.index !== members[j + k].index) {
+                   moveMember(members, item.index, j + k);
+                 }
+               }
 
+               nodes.splice(0, way.nodes.length - 1);
+             }
+           }
 
-           mapFeatures: function(projection) {
-               var limit = 5;
-               return searchLimited(limit, projection, _mlyCache.points.rtree);
-           },
+           if (tempWay) {
+             graph = graph.remove(tempWay);
+           } // Final pass: skip dead items, split pairs, remove index properties
 
 
-           cachedImage: function(imageKey) {
-               return _mlyCache.images.forImageKey[imageKey];
-           },
+           var wayMembers = [];
 
+           for (i = 0; i < members.length; i++) {
+             item = members[i];
+             if (item.index === -1) continue;
 
-           sequences: function(projection) {
-               var viewport = projection.clipExtent();
-               var min = [viewport[0][0], viewport[1][1]];
-               var max = [viewport[1][0], viewport[0][1]];
-               var bbox = geoExtent(projection.invert(min), projection.invert(max)).bbox();
-               var sequenceKeys = {};
+             if (item.pair) {
+               wayMembers.push(item.pair[0]);
+               wayMembers.push(item.pair[1]);
+             } else {
+               wayMembers.push(utilObjectOmit(item, ['index']));
+             }
+           } // Put stops and platforms first, then nodes, ways, relations
+           // This is recommended for Public Transport v2 routes:
+           // see https://wiki.openstreetmap.org/wiki/Public_transport#Service_routes
 
-               // all sequences for images in viewport
-               _mlyCache.images.rtree.search(bbox)
-                   .forEach(function(d) {
-                       var sequenceKey = _mlyCache.sequences.forImageKey[d.data.key];
-                       if (sequenceKey) {
-                           sequenceKeys[sequenceKey] = true;
-                       }
-                   });
 
-               // Return lineStrings for the sequences
-               return Object.keys(sequenceKeys).map(function(sequenceKey) {
-                   return _mlyCache.sequences.lineString[sequenceKey];
-               });
-           },
+           var newMembers = PTv2members.concat(groups.node || [], wayMembers, groups.relation || []);
+           return graph.replace(relation.update({
+             members: newMembers
+           })); // `moveMember()` changes the `members` array in place by splicing
+           // the item with `.index = findIndex` to where it belongs,
+           // and marking the old position as "dead" with `.index = -1`
+           //
+           // j=5, k=0                jk
+           // segment                 5 4 7 6
+           // members       0 1 2 3 4 5 6 7 8 9        keep 5 in j+k
+           //
+           // j=5, k=1                j k
+           // segment                 5 4 7 6
+           // members       0 1 2 3 4 5 6 7 8 9        move 4 to j+k
+           // members       0 1 2 3 x 5 4 6 7 8 9      moved
+           //
+           // j=5, k=2                j   k
+           // segment                 5 4 7 6
+           // members       0 1 2 3 x 5 4 6 7 8 9      move 7 to j+k
+           // members       0 1 2 3 x 5 4 7 6 x 8 9    moved
+           //
+           // j=5, k=3                j     k
+           // segment                 5 4 7 6
+           // members       0 1 2 3 x 5 4 7 6 x 8 9    keep 6 in j+k
+           //
 
+           function moveMember(arr, findIndex, toIndex) {
+             var i;
 
-           signsSupported: function() {
-               return true;
-           },
+             for (i = 0; i < arr.length; i++) {
+               if (arr[i].index === findIndex) {
+                 break;
+               }
+             }
 
+             var item = Object.assign({}, arr[i]); // shallow copy
 
-           loadImages: function(projection) {
-               loadTiles('images', apibase + 'images?sort_by=key&', projection);
-               loadTiles('sequences', apibase + 'sequences?sort_by=key&', projection);
-           },
+             arr[i].index = -1; // mark as dead
 
+             item.index = toIndex;
+             arr.splice(toIndex, 0, item);
+           } // This is the same as `Relation.indexedMembers`,
+           // Except we don't want to index all the members, only the ways
 
-           loadSigns: function(projection) {
-               // if we are looking at signs, we'll actually need to fetch images too
-               loadTiles('images', apibase + 'images?sort_by=key&', projection);
-               loadTiles('map_features', apibase + 'map_features?layers=trafficsigns&min_nbr_image_detections=2&sort_by=key&', projection);
-               loadTiles('image_detections', apibase + 'image_detections?layers=trafficsigns&sort_by=key&', projection);
-           },
 
+           function withIndex(arr) {
+             var result = new Array(arr.length);
 
-           loadMapFeatures: function(projection) {
-               // if we are looking at signs, we'll actually need to fetch images too
-               loadTiles('images', apibase + 'images?sort_by=key', projection);
-               loadTiles('points', apibase + 'map_features?layers=points&min_nbr_image_detections=2&sort_by=key&values=' + mapFeatureConfig.values + '&', projection);
-               loadTiles('image_detections', apibase + 'image_detections?layers=points&sort_by=key&values=' + mapFeatureConfig.values + '&', projection);
-           },
+             for (var i = 0; i < arr.length; i++) {
+               result[i] = Object.assign({}, arr[i]); // shallow copy
 
+               result[i].index = i;
+             }
 
-           loadViewer: function(context) {
-               // add mly-wrapper
-               var wrap = context.container().select('.photoviewer')
-                   .selectAll('.mly-wrapper')
-                   .data([0]);
+             return result;
+           }
+         }
+       }
 
-               wrap.enter()
-                   .append('div')
-                   .attr('id', 'ideditor-mly')
-                   .attr('class', 'photo-wrapper mly-wrapper')
-                   .classed('hide', true);
+       function actionAddMidpoint(midpoint, node) {
+         return function (graph) {
+           graph = graph.replace(node.move(midpoint.loc));
+           var parents = utilArrayIntersection(graph.parentWays(graph.entity(midpoint.edge[0])), graph.parentWays(graph.entity(midpoint.edge[1])));
+           parents.forEach(function (way) {
+             for (var i = 0; i < way.nodes.length - 1; i++) {
+               if (geoEdgeEqual([way.nodes[i], way.nodes[i + 1]], midpoint.edge)) {
+                 graph = graph.replace(graph.entity(way.id).addNode(node.id, i + 1)); // Add only one midpoint on doubled-back segments,
+                 // turning them into self-intersections.
 
-               // load mapillary-viewercss
-               select('head').selectAll('#ideditor-mapillary-viewercss')
-                   .data([0])
-                   .enter()
-                   .append('link')
-                   .attr('id', 'ideditor-mapillary-viewercss')
-                   .attr('rel', 'stylesheet')
-                   .attr('href', context.asset(viewercss));
+                 return;
+               }
+             }
+           });
+           return graph;
+         };
+       }
 
-               // load mapillary-viewerjs
-               select('head').selectAll('#ideditor-mapillary-viewerjs')
-                   .data([0])
-                   .enter()
-                   .append('script')
-                   .attr('id', 'ideditor-mapillary-viewerjs')
-                   .attr('src', context.asset(viewerjs));
-
-               // load mapillary signs sprite
-               var defs = context.container().select('defs');
-               defs.call(svgDefs(context).addSprites, ['mapillary-sprite', 'mapillary-object-sprite'], false /* don't override colors */ );
-
-               // Register viewer resize handler
-               context.ui().photoviewer.on('resize.mapillary', function() {
-                   if (_mlyViewer) {
-                       _mlyViewer.resize();
-                   }
-               });
-           },
+       // https://github.com/openstreetmap/potlatch2/blob/master/net/systemeD/halcyon/connection/actions/AddNodeToWayAction.as
+       function actionAddVertex(wayId, nodeId, index) {
+         return function (graph) {
+           return graph.replace(graph.entity(wayId).addNode(nodeId, index));
+         };
+       }
 
+       function actionChangeMember(relationId, member, memberIndex) {
+         return function (graph) {
+           return graph.replace(graph.entity(relationId).updateMember(member, memberIndex));
+         };
+       }
 
-           showViewer: function(context) {
-               var wrap = context.container().select('.photoviewer')
-                   .classed('hide', false);
+       function actionChangePreset(entityID, oldPreset, newPreset, skipFieldDefaults) {
+         return function action(graph) {
+           var entity = graph.entity(entityID);
+           var geometry = entity.geometry(graph);
+           var tags = entity.tags;
+           if (oldPreset) tags = oldPreset.unsetTags(tags, geometry);
+           if (newPreset) tags = newPreset.setTags(tags, geometry, skipFieldDefaults);
+           return graph.replace(entity.update({
+             tags: tags
+           }));
+         };
+       }
 
-               var isHidden = wrap.selectAll('.photo-wrapper.mly-wrapper.hide').size();
+       function actionChangeTags(entityId, tags) {
+         return function (graph) {
+           var entity = graph.entity(entityId);
+           return graph.replace(entity.update({
+             tags: tags
+           }));
+         };
+       }
 
-               if (isHidden && _mlyViewer) {
-                   wrap
-                       .selectAll('.photo-wrapper:not(.mly-wrapper)')
-                       .classed('hide', true);
+       function osmNode() {
+         if (!(this instanceof osmNode)) {
+           return new osmNode().initialize(arguments);
+         } else if (arguments.length) {
+           this.initialize(arguments);
+         }
+       }
+       osmEntity.node = osmNode;
+       osmNode.prototype = Object.create(osmEntity.prototype);
+       Object.assign(osmNode.prototype, {
+         type: 'node',
+         loc: [9999, 9999],
+         extent: function extent() {
+           return new geoExtent(this.loc);
+         },
+         geometry: function geometry(graph) {
+           return graph["transient"](this, 'geometry', function () {
+             return graph.isPoi(this) ? 'point' : 'vertex';
+           });
+         },
+         move: function move(loc) {
+           return this.update({
+             loc: loc
+           });
+         },
+         isDegenerate: function isDegenerate() {
+           return !(Array.isArray(this.loc) && this.loc.length === 2 && this.loc[0] >= -180 && this.loc[0] <= 180 && this.loc[1] >= -90 && this.loc[1] <= 90);
+         },
+         // Inspect tags and geometry to determine which direction(s) this node/vertex points
+         directions: function directions(resolver, projection) {
+           var val;
+           var i; // which tag to use?
+
+           if (this.isHighwayIntersection(resolver) && (this.tags.stop || '').toLowerCase() === 'all') {
+             // all-way stop tag on a highway intersection
+             val = 'all';
+           } else {
+             // generic direction tag
+             val = (this.tags.direction || '').toLowerCase(); // better suffix-style direction tag
 
-                   wrap
-                       .selectAll('.photo-wrapper.mly-wrapper')
-                       .classed('hide', false);
+             var re = /:direction$/i;
+             var keys = Object.keys(this.tags);
 
-                   _mlyViewer.resize();
+             for (i = 0; i < keys.length; i++) {
+               if (re.test(keys[i])) {
+                 val = this.tags[keys[i]].toLowerCase();
+                 break;
                }
+             }
+           }
 
-               return this;
-           },
+           if (val === '') return [];
+           var cardinal = {
+             north: 0,
+             n: 0,
+             northnortheast: 22,
+             nne: 22,
+             northeast: 45,
+             ne: 45,
+             eastnortheast: 67,
+             ene: 67,
+             east: 90,
+             e: 90,
+             eastsoutheast: 112,
+             ese: 112,
+             southeast: 135,
+             se: 135,
+             southsoutheast: 157,
+             sse: 157,
+             south: 180,
+             s: 180,
+             southsouthwest: 202,
+             ssw: 202,
+             southwest: 225,
+             sw: 225,
+             westsouthwest: 247,
+             wsw: 247,
+             west: 270,
+             w: 270,
+             westnorthwest: 292,
+             wnw: 292,
+             northwest: 315,
+             nw: 315,
+             northnorthwest: 337,
+             nnw: 337
+           };
+           var values = val.split(';');
+           var results = [];
+           values.forEach(function (v) {
+             // swap cardinal for numeric directions
+             if (cardinal[v] !== undefined) {
+               v = cardinal[v];
+             } // numeric direction - just add to results
 
 
-           hideViewer: function(context) {
-               _mlySelectedImageKey = null;
+             if (v !== '' && !isNaN(+v)) {
+               results.push(+v);
+               return;
+             } // string direction - inspect parent ways
 
-               if (!_mlyFallback && _mlyViewer) {
-                   _mlyViewer.getComponent('sequence').stop();
-               }
 
-               var viewer = context.container().select('.photoviewer');
-               if (!viewer.empty()) viewer.datum(null);
+             var lookBackward = this.tags['traffic_sign:backward'] || v === 'backward' || v === 'both' || v === 'all';
+             var lookForward = this.tags['traffic_sign:forward'] || v === 'forward' || v === 'both' || v === 'all';
+             if (!lookForward && !lookBackward) return;
+             var nodeIds = {};
+             resolver.parentWays(this).forEach(function (parent) {
+               var nodes = parent.nodes;
 
-               viewer
-                   .classed('hide', true)
-                   .selectAll('.photo-wrapper')
-                   .classed('hide', true);
+               for (i = 0; i < nodes.length; i++) {
+                 if (nodes[i] === this.id) {
+                   // match current entity
+                   if (lookForward && i > 0) {
+                     nodeIds[nodes[i - 1]] = true; // look back to prev node
+                   }
 
-               context.container().selectAll('.viewfield-group, .sequence, .icon-detected')
-                   .classed('currentView', false);
+                   if (lookBackward && i < nodes.length - 1) {
+                     nodeIds[nodes[i + 1]] = true; // look ahead to next node
+                   }
+                 }
+               }
+             }, this);
+             Object.keys(nodeIds).forEach(function (nodeId) {
+               // +90 because geoAngle returns angle from X axis, not Y (north)
+               results.push(geoAngle(this, resolver.entity(nodeId), projection) * (180 / Math.PI) + 90);
+             }, this);
+           }, this);
+           return utilArrayUniq(results);
+         },
+         isEndpoint: function isEndpoint(resolver) {
+           return resolver["transient"](this, 'isEndpoint', function () {
+             var id = this.id;
+             return resolver.parentWays(this).filter(function (parent) {
+               return !parent.isClosed() && !!parent.affix(id);
+             }).length > 0;
+           });
+         },
+         isConnected: function isConnected(resolver) {
+           return resolver["transient"](this, 'isConnected', function () {
+             var parents = resolver.parentWays(this);
 
-               return this.setStyles(context, null, true);
-           },
+             if (parents.length > 1) {
+               // vertex is connected to multiple parent ways
+               for (var i in parents) {
+                 if (parents[i].geometry(resolver) === 'line' && parents[i].hasInterestingTags()) return true;
+               }
+             } else if (parents.length === 1) {
+               var way = parents[0];
+               var nodes = way.nodes.slice();
 
+               if (way.isClosed()) {
+                 nodes.pop();
+               } // ignore connecting node if closed
+               // return true if vertex appears multiple times (way is self intersecting)
 
-           parsePagination: parsePagination,
 
+               return nodes.indexOf(this.id) !== nodes.lastIndexOf(this.id);
+             }
 
-           updateViewer: function(context, imageKey) {
-               if (!imageKey) return this;
+             return false;
+           });
+         },
+         parentIntersectionWays: function parentIntersectionWays(resolver) {
+           return resolver["transient"](this, 'parentIntersectionWays', function () {
+             return resolver.parentWays(this).filter(function (parent) {
+               return (parent.tags.highway || parent.tags.waterway || parent.tags.railway || parent.tags.aeroway) && parent.geometry(resolver) === 'line';
+             });
+           });
+         },
+         isIntersection: function isIntersection(resolver) {
+           return this.parentIntersectionWays(resolver).length > 1;
+         },
+         isHighwayIntersection: function isHighwayIntersection(resolver) {
+           return resolver["transient"](this, 'isHighwayIntersection', function () {
+             return resolver.parentWays(this).filter(function (parent) {
+               return parent.tags.highway && parent.geometry(resolver) === 'line';
+             }).length > 1;
+           });
+         },
+         isOnAddressLine: function isOnAddressLine(resolver) {
+           return resolver["transient"](this, 'isOnAddressLine', function () {
+             return resolver.parentWays(this).filter(function (parent) {
+               return parent.tags.hasOwnProperty('addr:interpolation') && parent.geometry(resolver) === 'line';
+             }).length > 0;
+           });
+         },
+         asJXON: function asJXON(changeset_id) {
+           var r = {
+             node: {
+               '@id': this.osmId(),
+               '@lon': this.loc[0],
+               '@lat': this.loc[1],
+               '@version': this.version || 0,
+               tag: Object.keys(this.tags).map(function (k) {
+                 return {
+                   keyAttributes: {
+                     k: k,
+                     v: this.tags[k]
+                   }
+                 };
+               }, this)
+             }
+           };
+           if (changeset_id) r.node['@changeset'] = changeset_id;
+           return r;
+         },
+         asGeoJSON: function asGeoJSON() {
+           return {
+             type: 'Point',
+             coordinates: this.loc
+           };
+         }
+       });
 
-               if (!_mlyViewer) {
-                   this.initViewer(context, imageKey);
-               } else {
-                   _mlyViewer.moveToKey(imageKey)
-                       .catch(function(e) { console.error('mly3', e); });  // eslint-disable-line no-console
-               }
+       function actionCircularize(wayId, projection, maxAngle) {
+         maxAngle = (maxAngle || 20) * Math.PI / 180;
+
+         var action = function action(graph, t) {
+           if (t === null || !isFinite(t)) t = 1;
+           t = Math.min(Math.max(+t, 0), 1);
+           var way = graph.entity(wayId);
+           var origNodes = {};
+           graph.childNodes(way).forEach(function (node) {
+             if (!origNodes[node.id]) origNodes[node.id] = node;
+           });
 
-               return this;
-           },
+           if (!way.isConvex(graph)) {
+             graph = action.makeConvex(graph);
+           }
 
+           var nodes = utilArrayUniq(graph.childNodes(way));
+           var keyNodes = nodes.filter(function (n) {
+             return graph.parentWays(n).length !== 1;
+           });
+           var points = nodes.map(function (n) {
+             return projection(n.loc);
+           });
+           var keyPoints = keyNodes.map(function (n) {
+             return projection(n.loc);
+           });
+           var centroid = points.length === 2 ? geoVecInterp(points[0], points[1], 0.5) : d3_polygonCentroid(points);
+           var radius = d3_median(points, function (p) {
+             return geoVecLength(centroid, p);
+           });
+           var sign = d3_polygonArea(points) > 0 ? 1 : -1;
+           var ids, i, j, k; // we need at least two key nodes for the algorithm to work
+
+           if (!keyNodes.length) {
+             keyNodes = [nodes[0]];
+             keyPoints = [points[0]];
+           }
+
+           if (keyNodes.length === 1) {
+             var index = nodes.indexOf(keyNodes[0]);
+             var oppositeIndex = Math.floor((index + nodes.length / 2) % nodes.length);
+             keyNodes.push(nodes[oppositeIndex]);
+             keyPoints.push(points[oppositeIndex]);
+           } // key points and nodes are those connected to the ways,
+           // they are projected onto the circle, in between nodes are moved
+           // to constant intervals between key nodes, extra in between nodes are
+           // added if necessary.
+
+
+           for (i = 0; i < keyPoints.length; i++) {
+             var nextKeyNodeIndex = (i + 1) % keyNodes.length;
+             var startNode = keyNodes[i];
+             var endNode = keyNodes[nextKeyNodeIndex];
+             var startNodeIndex = nodes.indexOf(startNode);
+             var endNodeIndex = nodes.indexOf(endNode);
+             var numberNewPoints = -1;
+             var indexRange = endNodeIndex - startNodeIndex;
+             var nearNodes = {};
+             var inBetweenNodes = [];
+             var startAngle, endAngle, totalAngle, eachAngle;
+             var angle, loc, node, origNode;
+
+             if (indexRange < 0) {
+               indexRange += nodes.length;
+             } // position this key node
+
+
+             var distance = geoVecLength(centroid, keyPoints[i]) || 1e-4;
+             keyPoints[i] = [centroid[0] + (keyPoints[i][0] - centroid[0]) / distance * radius, centroid[1] + (keyPoints[i][1] - centroid[1]) / distance * radius];
+             loc = projection.invert(keyPoints[i]);
+             node = keyNodes[i];
+             origNode = origNodes[node.id];
+             node = node.move(geoVecInterp(origNode.loc, loc, t));
+             graph = graph.replace(node); // figure out the between delta angle we want to match to
+
+             startAngle = Math.atan2(keyPoints[i][1] - centroid[1], keyPoints[i][0] - centroid[0]);
+             endAngle = Math.atan2(keyPoints[nextKeyNodeIndex][1] - centroid[1], keyPoints[nextKeyNodeIndex][0] - centroid[0]);
+             totalAngle = endAngle - startAngle; // detects looping around -pi/pi
+
+             if (totalAngle * sign > 0) {
+               totalAngle = -sign * (2 * Math.PI - Math.abs(totalAngle));
+             }
 
-           initViewer: function(context, imageKey) {
-               var that = this;
-               if (window.Mapillary && imageKey) {
-                   var opts = {
-                       baseImageSize: 320,
-                       component: {
-                           cover: false,
-                           keyboard: false,
-                           tag: true
-                       }
-                   };
+             do {
+               numberNewPoints++;
+               eachAngle = totalAngle / (indexRange + numberNewPoints);
+             } while (Math.abs(eachAngle) > maxAngle); // move existing nodes
 
-                   // Disable components requiring WebGL support
-                   if (!Mapillary.isSupported() && Mapillary.isFallbackSupported()) {
-                       _mlyFallback = true;
-                       opts.component = {
-                           cover: false,
-                           direction: false,
-                           imagePlane: false,
-                           keyboard: false,
-                           mouse: false,
-                           sequence: false,
-                           tag: false,
-                           image: true,        // fallback
-                           navigation: true    // fallback
-                       };
-                   }
 
-                   _mlyViewer = new Mapillary.Viewer('ideditor-mly', clientId, null, opts);
-                   _mlyViewer.on('nodechanged', nodeChanged);
-                   _mlyViewer.on('bearingchanged', bearingChanged);
-                   _mlyViewer.moveToKey(imageKey)
-                       .catch(function(e) { console.error('mly3', e); });  // eslint-disable-line no-console
-               }
-
-               // nodeChanged: called after the viewer has changed images and is ready.
-               //
-               // There is some logic here to batch up clicks into a _mlyClicks array
-               // because the user might click on a lot of markers quickly and nodechanged
-               // may be called out of order asychronously.
-               //
-               // Clicks are added to the array in `selectedImage` and removed here.
-               //
-               function nodeChanged(node) {
-                   if (!_mlyFallback) {
-                       _mlyViewer.getComponent('tag').removeAll();  // remove previous detections
-                   }
+             for (j = 1; j < indexRange; j++) {
+               angle = startAngle + j * eachAngle;
+               loc = projection.invert([centroid[0] + Math.cos(angle) * radius, centroid[1] + Math.sin(angle) * radius]);
+               node = nodes[(j + startNodeIndex) % nodes.length];
+               origNode = origNodes[node.id];
+               nearNodes[node.id] = angle;
+               node = node.move(geoVecInterp(origNode.loc, loc, t));
+               graph = graph.replace(node);
+             } // add new in between nodes if necessary
 
-                   var clicks = _mlyClicks;
-                   var index = clicks.indexOf(node.key);
-                   var selectedKey = _mlySelectedImageKey;
 
-                   if (index > -1) {              // `nodechanged` initiated from clicking on a marker..
-                       clicks.splice(index, 1);   // remove the click
-                       // If `node.key` matches the current _mlySelectedImageKey, call `selectImage()`
-                       // one more time to update the detections and attribution..
-                       if (node.key === selectedKey) {
-                           that.selectImage(context, _mlySelectedImageKey, true);
-                       }
-                   } else {             // `nodechanged` initiated from the Mapillary viewer controls..
-                       var loc = node.computedLatLon ? [node.computedLatLon.lon, node.computedLatLon.lat] : [node.latLon.lon, node.latLon.lat];
-                       context.map().centerEase(loc);
-                       that.selectImage(context, node.key, true);
-                   }
-               }
+             for (j = 0; j < numberNewPoints; j++) {
+               angle = startAngle + (indexRange + j) * eachAngle;
+               loc = projection.invert([centroid[0] + Math.cos(angle) * radius, centroid[1] + Math.sin(angle) * radius]); // choose a nearnode to use as the original
 
-               function bearingChanged(e) {
-                   dispatch$4.call('bearingChanged', undefined, e);
-               }
-           },
+               var min = Infinity;
 
+               for (var nodeId in nearNodes) {
+                 var nearAngle = nearNodes[nodeId];
+                 var dist = Math.abs(nearAngle - angle);
 
-           // Pass in the image key string as `imageKey`.
-           // This allows images to be selected from places that dont have access
-           // to the full image datum (like the street signs layer or the js viewer)
-           selectImage: function(context, imageKey, fromViewer) {
+                 if (dist < min) {
+                   min = dist;
+                   origNode = origNodes[nodeId];
+                 }
+               }
 
-               _mlySelectedImageKey = imageKey;
+               node = osmNode({
+                 loc: geoVecInterp(origNode.loc, loc, t)
+               });
+               graph = graph.replace(node);
+               nodes.splice(endNodeIndex + j, 0, node);
+               inBetweenNodes.push(node.id);
+             } // Check for other ways that share these keyNodes..
+             // If keyNodes are adjacent in both ways,
+             // we can add inBetweenNodes to that shared way too..
 
-               // Note the datum could be missing, but we'll try to carry on anyway.
-               // There just might be a delay before user sees detections, captured_at, etc.
-               var d = _mlyCache.images.forImageKey[imageKey];
 
-               var viewer = context.container().select('.photoviewer');
-               if (!viewer.empty()) viewer.datum(d);
+             if (indexRange === 1 && inBetweenNodes.length) {
+               var startIndex1 = way.nodes.lastIndexOf(startNode.id);
+               var endIndex1 = way.nodes.lastIndexOf(endNode.id);
+               var wayDirection1 = endIndex1 - startIndex1;
 
-               imageKey = (d && d.key) || imageKey;
-               if (!fromViewer && imageKey) {
-                   _mlyClicks.push(imageKey);
+               if (wayDirection1 < -1) {
+                 wayDirection1 = 1;
                }
 
-               this.setStyles(context, null, true);
+               var parentWays = graph.parentWays(keyNodes[i]);
 
-               // if signs signs are shown, highlight the ones that appear in this image
-               context.container().selectAll('.layer-mapillary-signs .icon-detected')
-                   .classed('currentView', function(d) {
-                       return d.detections.some(function(detection) {
-                           return detection.image_key === imageKey;
-                       });
-                   });
+               for (j = 0; j < parentWays.length; j++) {
+                 var sharedWay = parentWays[j];
+                 if (sharedWay === way) continue;
 
-               if (d) {
-                   this.updateDetections(d);
-               }
+                 if (sharedWay.areAdjacent(startNode.id, endNode.id)) {
+                   var startIndex2 = sharedWay.nodes.lastIndexOf(startNode.id);
+                   var endIndex2 = sharedWay.nodes.lastIndexOf(endNode.id);
+                   var wayDirection2 = endIndex2 - startIndex2;
+                   var insertAt = endIndex2;
 
-               return this;
-           },
+                   if (wayDirection2 < -1) {
+                     wayDirection2 = 1;
+                   }
 
+                   if (wayDirection1 !== wayDirection2) {
+                     inBetweenNodes.reverse();
+                     insertAt = startIndex2;
+                   }
 
-           getSelectedImageKey: function() {
-               return _mlySelectedImageKey;
-           },
+                   for (k = 0; k < inBetweenNodes.length; k++) {
+                     sharedWay = sharedWay.addNode(inBetweenNodes[k], insertAt + k);
+                   }
 
+                   graph = graph.replace(sharedWay);
+                 }
+               }
+             }
+           } // update the way to have all the new nodes
 
-           getSequenceKeyForImageKey: function(imageKey) {
-               return _mlyCache.sequences.forImageKey[imageKey];
-           },
 
+           ids = nodes.map(function (n) {
+             return n.id;
+           });
+           ids.push(ids[0]);
+           way = way.update({
+             nodes: ids
+           });
+           graph = graph.replace(way);
+           return graph;
+         };
 
-           // Updates the currently highlighted sequence and selected bubble.
-           // Reset is only necessary when interacting with the viewport because
-           // this implicitly changes the currently selected bubble/sequence
-           setStyles: function(context, hovered, reset) {
-               if (reset) {  // reset all layers
-                   context.container().selectAll('.viewfield-group')
-                       .classed('highlighted', false)
-                       .classed('hovered', false)
-                       .classed('currentView', false);
+         action.makeConvex = function (graph) {
+           var way = graph.entity(wayId);
+           var nodes = utilArrayUniq(graph.childNodes(way));
+           var points = nodes.map(function (n) {
+             return projection(n.loc);
+           });
+           var sign = d3_polygonArea(points) > 0 ? 1 : -1;
+           var hull = d3_polygonHull(points);
+           var i, j; // D3 convex hulls go counterclockwise..
 
-                   context.container().selectAll('.sequence')
-                       .classed('highlighted', false)
-                       .classed('currentView', false);
-               }
+           if (sign === -1) {
+             nodes.reverse();
+             points.reverse();
+           }
 
-               var hoveredImageKey = hovered && hovered.key;
-               var hoveredSequenceKey = hoveredImageKey && this.getSequenceKeyForImageKey(hoveredImageKey);
-               var hoveredLineString = hoveredSequenceKey && _mlyCache.sequences.lineString[hoveredSequenceKey];
-               var hoveredImageKeys = (hoveredLineString && hoveredLineString.properties.coordinateProperties.image_keys) || [];
+           for (i = 0; i < hull.length - 1; i++) {
+             var startIndex = points.indexOf(hull[i]);
+             var endIndex = points.indexOf(hull[i + 1]);
+             var indexRange = endIndex - startIndex;
 
-               var selectedImageKey = _mlySelectedImageKey;
-               var selectedSequenceKey = selectedImageKey && this.getSequenceKeyForImageKey(selectedImageKey);
-               var selectedLineString = selectedSequenceKey && _mlyCache.sequences.lineString[selectedSequenceKey];
-               var selectedImageKeys = (selectedLineString && selectedLineString.properties.coordinateProperties.image_keys) || [];
+             if (indexRange < 0) {
+               indexRange += nodes.length;
+             } // move interior nodes to the surface of the convex hull..
 
-               // highlight sibling viewfields on either the selected or the hovered sequences
-               var highlightedImageKeys = utilArrayUnion(hoveredImageKeys, selectedImageKeys);
 
-               context.container().selectAll('.layer-mapillary .viewfield-group')
-                   .classed('highlighted', function(d) { return highlightedImageKeys.indexOf(d.key) !== -1; })
-                   .classed('hovered', function(d) { return d.key === hoveredImageKey; })
-                   .classed('currentView', function(d) { return d.key === selectedImageKey; });
+             for (j = 1; j < indexRange; j++) {
+               var point = geoVecInterp(hull[i], hull[i + 1], j / indexRange);
+               var node = nodes[(j + startIndex) % nodes.length].move(projection.invert(point));
+               graph = graph.replace(node);
+             }
+           }
 
-               context.container().selectAll('.layer-mapillary .sequence')
-                   .classed('highlighted', function(d) { return d.properties.key === hoveredSequenceKey; })
-                   .classed('currentView', function(d) { return d.properties.key === selectedSequenceKey; });
+           return graph;
+         };
 
-               // update viewfields if needed
-               context.container().selectAll('.viewfield-group .viewfield')
-                   .attr('d', viewfieldPath);
+         action.disabled = function (graph) {
+           if (!graph.entity(wayId).isClosed()) {
+             return 'not_closed';
+           } //disable when already circular
 
-               function viewfieldPath() {
-                   var d = this.parentNode.__data__;
-                   if (d.pano && d.key !== selectedImageKey) {
-                       return 'M 8,13 m -10,0 a 10,10 0 1,0 20,0 a 10,10 0 1,0 -20,0';
-                   } else {
-                       return 'M 6,9 C 8,8.4 8,8.4 10,9 L 16,-2 C 12,-5 4,-5 0,-2 z';
-                   }
-               }
 
-               return this;
-           },
+           var way = graph.entity(wayId);
+           var nodes = utilArrayUniq(graph.childNodes(way));
+           var points = nodes.map(function (n) {
+             return projection(n.loc);
+           });
+           var hull = d3_polygonHull(points);
+           var epsilonAngle = Math.PI / 180;
 
+           if (hull.length !== points.length || hull.length < 3) {
+             return false;
+           }
 
-           updateDetections: function(d) {
-               if (!_mlyViewer || _mlyFallback) return;
+           var centroid = d3_polygonCentroid(points);
+           var radius = geoVecLengthSquare(centroid, points[0]);
+           var i, actualPoint; // compare distances between centroid and points
 
-               var imageKey = d && d.key;
-               if (!imageKey) return;
+           for (i = 0; i < hull.length; i++) {
+             actualPoint = hull[i];
+             var actualDist = geoVecLengthSquare(actualPoint, centroid);
+             var diff = Math.abs(actualDist - radius); //compare distances with epsilon-error (5%)
 
-               var detections = _mlyCache.image_detections.forImageKey[imageKey] || [];
-               detections.forEach(function(data) {
-                   var tag = makeTag(data);
-                   if (tag) {
-                       var tagComponent = _mlyViewer.getComponent('tag');
-                       tagComponent.add([tag]);
-                   }
-               });
+             if (diff > 0.05 * radius) {
+               return false;
+             }
+           } //check if central angles are smaller than maxAngle
 
-               function makeTag(data) {
-                   var valueParts = data.value.split('--');
-                   if (valueParts.length !== 3) return;
-
-                   var text = valueParts[1].replace(/-/g, ' ');
-                   var tag;
-
-                   // Currently only two shapes <Polygon|Point>
-                   if (data.shape.type === 'Polygon') {
-                       var polygonGeometry = new Mapillary
-                           .TagComponent
-                           .PolygonGeometry(data.shape.coordinates[0]);
-
-                       tag = new Mapillary.TagComponent.OutlineTag(
-                           data.key,
-                           polygonGeometry,
-                           {
-                               text: text,
-                               textColor: 0xffff00,
-                               lineColor: 0xffff00,
-                               lineWidth: 2,
-                               fillColor: 0xffff00,
-                               fillOpacity: 0.3,
-                           }
-                       );
 
-                   } else if (data.shape.type === 'Point') {
-                       var pointGeometry = new Mapillary
-                           .TagComponent
-                           .PointGeometry(data.shape.coordinates[0]);
-
-                       tag = new Mapillary.TagComponent.SpotTag(
-                           data.key,
-                           pointGeometry,
-                           {
-                               text: text,
-                               color: 0xffff00,
-                               textColor: 0xffff00
-                           }
-                       );
-                   }
+           for (i = 0; i < hull.length; i++) {
+             actualPoint = hull[i];
+             var nextPoint = hull[(i + 1) % hull.length];
+             var startAngle = Math.atan2(actualPoint[1] - centroid[1], actualPoint[0] - centroid[0]);
+             var endAngle = Math.atan2(nextPoint[1] - centroid[1], nextPoint[0] - centroid[0]);
+             var angle = endAngle - startAngle;
 
-                   return tag;
-               }
-           },
+             if (angle < 0) {
+               angle = -angle;
+             }
 
+             if (angle > Math.PI) {
+               angle = 2 * Math.PI - angle;
+             }
 
-           cache: function() {
-               return _mlyCache;
+             if (angle > maxAngle + epsilonAngle) {
+               return false;
+             }
            }
 
-       };
+           return 'already_circular';
+         };
 
-       function validationIssue(attrs) {
-           this.type = attrs.type;                // required - name of rule that created the issue (e.g. 'missing_tag')
-           this.subtype = attrs.subtype;          // optional - category of the issue within the type (e.g. 'relation_type' under 'missing_tag')
-           this.severity = attrs.severity;        // required - 'warning' or 'error'
-           this.message = attrs.message;          // required - function returning localized string
-           this.reference = attrs.reference;      // optional - function(selection) to render reference information
-           this.entityIds = attrs.entityIds;      // optional - array of IDs of entities involved in the issue
-           this.loc = attrs.loc;                  // optional - [lon, lat] to zoom in on to see the issue
-           this.data = attrs.data;                // optional - object containing extra data for the fixes
-           this.dynamicFixes = attrs.dynamicFixes;// optional - function(context) returning fixes
-           this.hash = attrs.hash;                // optional - string to further differentiate the issue
+         action.transitionable = true;
+         return action;
+       }
 
-           this.id = generateID.apply(this);      // generated - see below
-           this.autoFix = null;                   // generated - if autofix exists, will be set below
+       function actionDeleteWay(wayID) {
+         function canDeleteNode(node, graph) {
+           // don't delete nodes still attached to ways or relations
+           if (graph.parentWays(node).length || graph.parentRelations(node).length) return false;
+           var geometries = osmNodeGeometriesForTags(node.tags); // don't delete if this node can be a standalone point
 
-           // A unique, deterministic string hash.
-           // Issues with identical id values are considered identical.
-           function generateID() {
-               var parts = [this.type];
+           if (geometries.point) return false; // delete if this node only be a vertex
 
-               if (this.hash) {   // subclasses can pass in their own differentiator
-                   parts.push(this.hash);
-               }
+           if (geometries.vertex) return true; // iD doesn't know if this should be a point or vertex,
+           // so only delete if there are no interesting tags
 
-               if (this.subtype) {
-                   parts.push(this.subtype);
-               }
+           return !node.hasInterestingTags();
+         }
 
-               // include the entities this issue is for
-               // (sort them so the id is deterministic)
-               if (this.entityIds) {
-                   var entityKeys = this.entityIds.slice().sort();
-                   parts.push.apply(parts, entityKeys);
-               }
+         var action = function action(graph) {
+           var way = graph.entity(wayID);
+           graph.parentRelations(way).forEach(function (parent) {
+             parent = parent.removeMembersWithID(wayID);
+             graph = graph.replace(parent);
 
-               return parts.join(':');
-           }
+             if (parent.isDegenerate()) {
+               graph = actionDeleteRelation(parent.id)(graph);
+             }
+           });
+           new Set(way.nodes).forEach(function (nodeID) {
+             graph = graph.replace(way.removeNode(nodeID));
+             var node = graph.entity(nodeID);
 
-           this.extent = function(resolver) {
-               if (this.loc) {
-                   return geoExtent(this.loc);
-               }
-               if (this.entityIds && this.entityIds.length) {
-                   return this.entityIds.reduce(function(extent, entityId) {
-                       return extent.extend(resolver.entity(entityId).extent(resolver));
-                   }, geoExtent());
-               }
-               return null;
-           };
+             if (canDeleteNode(node, graph)) {
+               graph = graph.remove(node);
+             }
+           });
+           return graph.remove(way);
+         };
 
-           this.fixes = function(context) {
-               var fixes = this.dynamicFixes ? this.dynamicFixes(context) : [];
-               var issue = this;
+         return action;
+       }
 
-               if (issue.severity === 'warning') {
-                   // allow ignoring any issue that's not an error
-                   fixes.push(new validationIssueFix({
-                       title: _t('issues.fix.ignore_issue.title'),
-                       icon: 'iD-icon-close',
-                       onClick: function() {
-                           context.validator().ignoreIssue(this.issue.id);
-                       }
-                   }));
-               }
+       function actionDeleteMultiple(ids) {
+         var actions = {
+           way: actionDeleteWay,
+           node: actionDeleteNode,
+           relation: actionDeleteRelation
+         };
 
-               fixes.forEach(function(fix) {
-                   fix.id = fix.title;
-                   // add a reference to the issue for use in actions
-                   fix.issue = issue;
-                   if (fix.autoArgs) {
-                       issue.autoFix = fix;
-                   }
-               });
-               return fixes;
-           };
+         var action = function action(graph) {
+           ids.forEach(function (id) {
+             if (graph.hasEntity(id)) {
+               // It may have been deleted already.
+               graph = actions[graph.entity(id).type](id)(graph);
+             }
+           });
+           return graph;
+         };
 
+         return action;
        }
 
+       function actionDeleteRelation(relationID, allowUntaggedMembers) {
+         function canDeleteEntity(entity, graph) {
+           return !graph.parentWays(entity).length && !graph.parentRelations(entity).length && !entity.hasInterestingTags() && !allowUntaggedMembers;
+         }
 
-       function validationIssueFix(attrs) {
-           this.title = attrs.title;                   // Required
-           this.onClick = attrs.onClick;               // Optional - the function to run to apply the fix
-           this.disabledReason = attrs.disabledReason; // Optional - a string explaining why the fix is unavailable, if any
-           this.icon = attrs.icon;                     // Optional - shows 'iD-icon-wrench' if not set
-           this.entityIds = attrs.entityIds || [];     // Optional - used for hover-higlighting.
-           this.autoArgs = attrs.autoArgs;             // Optional - pass [actions, annotation] arglist if this fix can automatically run
+         var action = function action(graph) {
+           var relation = graph.entity(relationID);
+           graph.parentRelations(relation).forEach(function (parent) {
+             parent = parent.removeMembersWithID(relationID);
+             graph = graph.replace(parent);
 
-           this.issue = null;    // Generated link - added by validationIssue
-       }
+             if (parent.isDegenerate()) {
+               graph = actionDeleteRelation(parent.id)(graph);
+             }
+           });
+           var memberIDs = utilArrayUniq(relation.members.map(function (m) {
+             return m.id;
+           }));
+           memberIDs.forEach(function (memberID) {
+             graph = graph.replace(relation.removeMembersWithID(memberID));
+             var entity = graph.entity(memberID);
 
-       var buildRuleChecks = function() {
-           return {
-               equals: function (equals) {
-                   return function(tags) {
-                       return Object.keys(equals).every(function(k) {
-                           return equals[k] === tags[k];
-                       });
-                   };
-               },
-               notEquals: function (notEquals) {
-                   return function(tags) {
-                       return Object.keys(notEquals).some(function(k) {
-                           return notEquals[k] !== tags[k];
-                       });
-                   };
-               },
-               absence: function(absence) {
-                   return function(tags) {
-                       return Object.keys(tags).indexOf(absence) === -1;
-                   };
-               },
-               presence: function(presence) {
-                   return function(tags) {
-                       return Object.keys(tags).indexOf(presence) > -1;
-                   };
-               },
-               greaterThan: function(greaterThan) {
-                   var key = Object.keys(greaterThan)[0];
-                   var value = greaterThan[key];
+             if (canDeleteEntity(entity, graph)) {
+               graph = actionDeleteMultiple([memberID])(graph);
+             }
+           });
+           return graph.remove(relation);
+         };
 
-                   return function(tags) {
-                       return tags[key] > value;
-                   };
-               },
-               greaterThanEqual: function(greaterThanEqual) {
-                   var key = Object.keys(greaterThanEqual)[0];
-                   var value = greaterThanEqual[key];
+         return action;
+       }
 
-                   return function(tags) {
-                       return tags[key] >= value;
-                   };
-               },
-               lessThan: function(lessThan) {
-                   var key = Object.keys(lessThan)[0];
-                   var value = lessThan[key];
+       function actionDeleteNode(nodeId) {
+         var action = function action(graph) {
+           var node = graph.entity(nodeId);
+           graph.parentWays(node).forEach(function (parent) {
+             parent = parent.removeNode(nodeId);
+             graph = graph.replace(parent);
 
-                   return function(tags) {
-                       return tags[key] < value;
-                   };
-               },
-               lessThanEqual: function(lessThanEqual) {
-                   var key = Object.keys(lessThanEqual)[0];
-                   var value = lessThanEqual[key];
+             if (parent.isDegenerate()) {
+               graph = actionDeleteWay(parent.id)(graph);
+             }
+           });
+           graph.parentRelations(node).forEach(function (parent) {
+             parent = parent.removeMembersWithID(nodeId);
+             graph = graph.replace(parent);
 
-                   return function(tags) {
-                       return tags[key] <= value;
-                   };
-               },
-               positiveRegex: function(positiveRegex) {
-                   var tagKey = Object.keys(positiveRegex)[0];
-                   var expression = positiveRegex[tagKey].join('|');
-                   var regex = new RegExp(expression);
+             if (parent.isDegenerate()) {
+               graph = actionDeleteRelation(parent.id)(graph);
+             }
+           });
+           return graph.remove(node);
+         };
 
-                   return function(tags) {
-                       return regex.test(tags[tagKey]);
-                   };
-               },
-               negativeRegex: function(negativeRegex) {
-                   var tagKey = Object.keys(negativeRegex)[0];
-                   var expression = negativeRegex[tagKey].join('|');
-                   var regex = new RegExp(expression);
+         return action;
+       }
 
-                   return function(tags) {
-                       return !regex.test(tags[tagKey]);
-                   };
-               }
-           };
-       };
+       //
+       // First choose a node to be the survivor, with preference given
+       // to an existing (not new) node.
+       //
+       // Tags and relation memberships of of non-surviving nodes are merged
+       // to the survivor.
+       //
+       // This is the inverse of `iD.actionDisconnect`.
+       //
+       // Reference:
+       //   https://github.com/openstreetmap/potlatch2/blob/master/net/systemeD/halcyon/connection/actions/MergeNodesAction.as
+       //   https://github.com/openstreetmap/josm/blob/mirror/src/org/openstreetmap/josm/actions/MergeNodesAction.java
+       //
 
-       var buildLineKeys = function() {
-           return {
-               highway: {
-                   rest_area: true,
-                   services: true
-               },
-               railway: {
-                   roundhouse: true,
-                   station: true,
-                   traverser: true,
-                   turntable: true,
-                   wash: true
-               }
-           };
-       };
+       function actionConnect(nodeIDs) {
+         var action = function action(graph) {
+           var survivor;
+           var node;
+           var parents;
+           var i, j; // Choose a survivor node, prefer an existing (not new) node - #4974
 
-       var serviceMapRules = {
-           init: function() {
-               this._ruleChecks  = buildRuleChecks();
-               this._validationRules = [];
-               this._areaKeys = osmAreaKeys;
-               this._lineKeys = buildLineKeys();
-           },
+           for (i = 0; i < nodeIDs.length; i++) {
+             survivor = graph.entity(nodeIDs[i]);
+             if (survivor.version) break; // found one
+           } // Replace all non-surviving nodes with the survivor and merge tags.
 
-           // list of rules only relevant to tag checks...
-           filterRuleChecks: function(selector) {
-               var _ruleChecks = this._ruleChecks;
-               return Object.keys(selector).reduce(function(rules, key) {
-                   if (['geometry', 'error', 'warning'].indexOf(key) === -1) {
-                       rules.push(_ruleChecks[key](selector[key]));
-                   }
-                   return rules;
-               }, []);
-           },
 
-           // builds tagMap from mapcss-parse selector object...
-           buildTagMap: function(selector) {
-               var getRegexValues = function(regexes) {
-                   return regexes.map(function(regex) {
-                       return regex.replace(/\$|\^/g, '');
-                   });
-               };
+           for (i = 0; i < nodeIDs.length; i++) {
+             node = graph.entity(nodeIDs[i]);
+             if (node.id === survivor.id) continue;
+             parents = graph.parentWays(node);
 
-               var tagMap = Object.keys(selector).reduce(function (expectedTags, key) {
-                   var values;
-                   var isRegex = /regex/gi.test(key);
-                   var isEqual = /equals/gi.test(key);
+             for (j = 0; j < parents.length; j++) {
+               graph = graph.replace(parents[j].replaceNode(node.id, survivor.id));
+             }
 
-                   if (isRegex || isEqual) {
-                       Object.keys(selector[key]).forEach(function(selectorKey) {
-                           values = isEqual ? [selector[key][selectorKey]] : getRegexValues(selector[key][selectorKey]);
+             parents = graph.parentRelations(node);
 
-                           if (expectedTags.hasOwnProperty(selectorKey)) {
-                               values = values.concat(expectedTags[selectorKey]);
-                           }
+             for (j = 0; j < parents.length; j++) {
+               graph = graph.replace(parents[j].replaceMember(node, survivor));
+             }
 
-                           expectedTags[selectorKey] = values;
-                       });
+             survivor = survivor.mergeTags(node.tags);
+             graph = actionDeleteNode(node.id)(graph);
+           }
 
-                   } else if (/(greater|less)Than(Equal)?|presence/g.test(key)) {
-                       var tagKey = /presence/.test(key) ? selector[key] : Object.keys(selector[key])[0];
+           graph = graph.replace(survivor); // find and delete any degenerate ways created by connecting adjacent vertices
 
-                       values = [selector[key][tagKey]];
+           parents = graph.parentWays(survivor);
 
-                       if (expectedTags.hasOwnProperty(tagKey)) {
-                           values = values.concat(expectedTags[tagKey]);
-                       }
+           for (i = 0; i < parents.length; i++) {
+             if (parents[i].isDegenerate()) {
+               graph = actionDeleteWay(parents[i].id)(graph);
+             }
+           }
 
-                       expectedTags[tagKey] = values;
-                   }
+           return graph;
+         };
 
-                   return expectedTags;
-               }, {});
+         action.disabled = function (graph) {
+           var seen = {};
+           var restrictionIDs = [];
+           var survivor;
+           var node, way;
+           var relations, relation, role;
+           var i, j, k; // Choose a survivor node, prefer an existing (not new) node - #4974
 
-               return tagMap;
-           },
+           for (i = 0; i < nodeIDs.length; i++) {
+             survivor = graph.entity(nodeIDs[i]);
+             if (survivor.version) break; // found one
+           } // 1. disable if the nodes being connected have conflicting relation roles
 
-           // inspired by osmWay#isArea()
-           inferGeometry: function(tagMap) {
-               var _lineKeys = this._lineKeys;
-               var _areaKeys = this._areaKeys;
 
-               var keyValueDoesNotImplyArea = function(key) {
-                   return utilArrayIntersection(tagMap[key], Object.keys(_areaKeys[key])).length > 0;
-               };
-               var keyValueImpliesLine = function(key) {
-                   return utilArrayIntersection(tagMap[key], Object.keys(_lineKeys[key])).length > 0;
-               };
+           for (i = 0; i < nodeIDs.length; i++) {
+             node = graph.entity(nodeIDs[i]);
+             relations = graph.parentRelations(node);
 
-               if (tagMap.hasOwnProperty('area')) {
-                   if (tagMap.area.indexOf('yes') > -1) {
-                       return 'area';
-                   }
-                   if (tagMap.area.indexOf('no') > -1) {
-                       return 'line';
-                   }
+             for (j = 0; j < relations.length; j++) {
+               relation = relations[j];
+               role = relation.memberById(node.id).role || ''; // if this node is a via node in a restriction, remember for later
+
+               if (relation.hasFromViaTo()) {
+                 restrictionIDs.push(relation.id);
                }
 
-               for (var key in tagMap) {
-                   if (key in _areaKeys && !keyValueDoesNotImplyArea(key)) {
-                       return 'area';
-                   }
-                   if (key in _lineKeys && keyValueImpliesLine(key)) {
-                       return 'area';
-                   }
+               if (seen[relation.id] !== undefined && seen[relation.id] !== role) {
+                 return 'relation';
+               } else {
+                 seen[relation.id] = role;
                }
+             }
+           } // gather restrictions for parent ways
 
-               return 'line';
-           },
 
-           // adds from mapcss-parse selector check...
-           addRule: function(selector) {
-               var rule = {
-                   // checks relevant to mapcss-selector
-                   checks: this.filterRuleChecks(selector),
-                   // true if all conditions for a tag error are true..
-                   matches: function(entity) {
-                       return this.checks.every(function(check) {
-                           return check(entity.tags);
-                       });
-                   },
-                   // borrowed from Way#isArea()
-                   inferredGeometry: this.inferGeometry(this.buildTagMap(selector), this._areaKeys),
-                   geometryMatches: function(entity, graph) {
-                       if (entity.type === 'node' || entity.type === 'relation') {
-                           return selector.geometry === entity.type;
-                       } else if (entity.type === 'way') {
-                           return this.inferredGeometry === entity.geometry(graph);
-                       }
-                   },
-                   // when geometries match and tag matches are present, return a warning...
-                   findIssues: function (entity, graph, issues) {
-                       if (this.geometryMatches(entity, graph) && this.matches(entity)) {
-                           var severity = Object.keys(selector).indexOf('error') > -1
-                                   ? 'error'
-                                   : 'warning';
-                           var message = selector[severity];
-                           issues.push(new validationIssue({
-                               type: 'maprules',
-                               severity: severity,
-                               message: function() {
-                                   return message;
-                               },
-                               entityIds: [entity.id]
-                           }));
-                       }
-                   }
-               };
-               this._validationRules.push(rule);
-           },
+           for (i = 0; i < nodeIDs.length; i++) {
+             node = graph.entity(nodeIDs[i]);
+             var parents = graph.parentWays(node);
 
-           clearRules: function() { this._validationRules = []; },
+             for (j = 0; j < parents.length; j++) {
+               var parent = parents[j];
+               relations = graph.parentRelations(parent);
 
-           // returns validationRules...
-           validationRules: function() { return this._validationRules; },
+               for (k = 0; k < relations.length; k++) {
+                 relation = relations[k];
 
-           // returns ruleChecks
-           ruleChecks: function() { return this._ruleChecks; }
-       };
+                 if (relation.hasFromViaTo()) {
+                   restrictionIDs.push(relation.id);
+                 }
+               }
+             }
+           } // test restrictions
 
-       var apibase$1 = 'https://nominatim.openstreetmap.org/';
-       var _inflight = {};
-       var _nominatimCache;
 
+           restrictionIDs = utilArrayUniq(restrictionIDs);
 
-       var serviceNominatim = {
+           for (i = 0; i < restrictionIDs.length; i++) {
+             relation = graph.entity(restrictionIDs[i]);
+             if (!relation.isComplete(graph)) continue;
+             var memberWays = relation.members.filter(function (m) {
+               return m.type === 'way';
+             }).map(function (m) {
+               return graph.entity(m.id);
+             });
+             memberWays = utilArrayUniq(memberWays);
+             var f = relation.memberByRole('from');
+             var t = relation.memberByRole('to');
+             var isUturn = f.id === t.id; // 2a. disable if connection would damage a restriction
+             // (a key node is a node at the junction of ways)
+
+             var nodes = {
+               from: [],
+               via: [],
+               to: [],
+               keyfrom: [],
+               keyto: []
+             };
 
-           init: function() {
-               _inflight = {};
-               _nominatimCache = new RBush();
-           },
+             for (j = 0; j < relation.members.length; j++) {
+               collectNodes(relation.members[j], nodes);
+             }
 
-           reset: function() {
-               Object.values(_inflight).forEach(function(controller) { controller.abort(); });
-               _inflight = {};
-               _nominatimCache = new RBush();
-           },
+             nodes.keyfrom = utilArrayUniq(nodes.keyfrom.filter(hasDuplicates));
+             nodes.keyto = utilArrayUniq(nodes.keyto.filter(hasDuplicates));
+             var filter = keyNodeFilter(nodes.keyfrom, nodes.keyto);
+             nodes.from = nodes.from.filter(filter);
+             nodes.via = nodes.via.filter(filter);
+             nodes.to = nodes.to.filter(filter);
+             var connectFrom = false;
+             var connectVia = false;
+             var connectTo = false;
+             var connectKeyFrom = false;
+             var connectKeyTo = false;
 
+             for (j = 0; j < nodeIDs.length; j++) {
+               var n = nodeIDs[j];
 
-           countryCode: function (location, callback) {
-               this.reverse(location, function(err, result) {
-                   if (err) {
-                       return callback(err);
-                   } else if (result.address) {
-                       return callback(null, result.address.country_code);
-                   } else {
-                       return callback('Unable to geocode', null);
-                   }
-               });
-           },
+               if (nodes.from.indexOf(n) !== -1) {
+                 connectFrom = true;
+               }
 
+               if (nodes.via.indexOf(n) !== -1) {
+                 connectVia = true;
+               }
 
-           reverse: function (loc, callback) {
-               var cached = _nominatimCache.search(
-                   { minX: loc[0], minY: loc[1], maxX: loc[0], maxY: loc[1] }
-               );
+               if (nodes.to.indexOf(n) !== -1) {
+                 connectTo = true;
+               }
 
-               if (cached.length > 0) {
-                   if (callback) callback(null, cached[0].data);
-                   return;
+               if (nodes.keyfrom.indexOf(n) !== -1) {
+                 connectKeyFrom = true;
                }
 
-               var params = { zoom: 13, format: 'json', addressdetails: 1, lat: loc[1], lon: loc[0] };
-               var url = apibase$1 + 'reverse?' + utilQsString(params);
+               if (nodes.keyto.indexOf(n) !== -1) {
+                 connectKeyTo = true;
+               }
+             }
 
-               if (_inflight[url]) return;
-               var controller = new AbortController();
-               _inflight[url] = controller;
+             if (connectFrom && connectTo && !isUturn) {
+               return 'restriction';
+             }
 
-               d3_json(url, { signal: controller.signal })
-                   .then(function(result) {
-                       delete _inflight[url];
-                       if (result && result.error) {
-                           throw new Error(result.error);
-                       }
-                       var extent = geoExtent(loc).padByMeters(200);
-                       _nominatimCache.insert(Object.assign(extent.bbox(), {data: result}));
-                       if (callback) callback(null, result);
-                   })
-                   .catch(function(err) {
-                       delete _inflight[url];
-                       if (err.name === 'AbortError') return;
-                       if (callback) callback(err.message);
-                   });
-           },
+             if (connectFrom && connectVia) {
+               return 'restriction';
+             }
 
+             if (connectTo && connectVia) {
+               return 'restriction';
+             } // connecting to a key node -
+             // if both nodes are on a member way (i.e. part of the turn restriction),
+             // the connecting node must be adjacent to the key node.
 
-           search: function (val, callback) {
-               var searchVal = encodeURIComponent(val);
-               var url = apibase$1 + 'search/' + searchVal + '?limit=10&format=json';
 
-               if (_inflight[url]) return;
-               var controller = new AbortController();
-               _inflight[url] = controller;
+             if (connectKeyFrom || connectKeyTo) {
+               if (nodeIDs.length !== 2) {
+                 return 'restriction';
+               }
 
-               d3_json(url, { signal: controller.signal })
-                   .then(function(result) {
-                       delete _inflight[url];
-                       if (result && result.error) {
-                           throw new Error(result.error);
-                       }
-                       if (callback) callback(null, result);
-                   })
-                   .catch(function(err) {
-                       delete _inflight[url];
-                       if (err.name === 'AbortError') return;
-                       if (callback) callback(err.message);
-                   });
-           }
+               var n0 = null;
+               var n1 = null;
 
-       };
+               for (j = 0; j < memberWays.length; j++) {
+                 way = memberWays[j];
 
-       var apibase$2 = 'https://openstreetcam.org';
-       var maxResults$1 = 1000;
-       var tileZoom$1 = 14;
-       var tiler$4 = utilTiler().zoomExtent([tileZoom$1, tileZoom$1]).skipNullIsland(true);
-       var dispatch$5 = dispatch('loadedImages');
-       var imgZoom = d3_zoom()
-           .extent([[0, 0], [320, 240]])
-           .translateExtent([[0, 0], [320, 240]])
-           .scaleExtent([1, 15]);
-       var _oscCache;
-       var _oscSelectedImage;
+                 if (way.contains(nodeIDs[0])) {
+                   n0 = nodeIDs[0];
+                 }
 
+                 if (way.contains(nodeIDs[1])) {
+                   n1 = nodeIDs[1];
+                 }
+               }
 
-       function abortRequest$4(controller) {
-           controller.abort();
-       }
+               if (n0 && n1) {
+                 // both nodes are part of the restriction
+                 var ok = false;
 
+                 for (j = 0; j < memberWays.length; j++) {
+                   way = memberWays[j];
 
-       function maxPageAtZoom$1(z) {
-           if (z < 15)   return 2;
-           if (z === 15) return 5;
-           if (z === 16) return 10;
-           if (z === 17) return 20;
-           if (z === 18) return 40;
-           if (z > 18)   return 80;
-       }
+                   if (way.areAdjacent(n0, n1)) {
+                     ok = true;
+                     break;
+                   }
+                 }
+
+                 if (!ok) {
+                   return 'restriction';
+                 }
+               }
+             } // 2b. disable if nodes being connected will destroy a member way in a restriction
+             // (to test, make a copy and try actually connecting the nodes)
 
 
-       function loadTiles$1(which, url, projection) {
-           var currZoom = Math.floor(geoScaleToZoom(projection.scale()));
-           var tiles = tiler$4.getTiles(projection);
+             for (j = 0; j < memberWays.length; j++) {
+               way = memberWays[j].update({}); // make copy
 
-           // abort inflight requests that are no longer needed
-           var cache = _oscCache[which];
-           Object.keys(cache.inflight).forEach(function(k) {
-               var wanted = tiles.find(function(tile) { return k.indexOf(tile.id + ',') === 0; });
-               if (!wanted) {
-                   abortRequest$4(cache.inflight[k]);
-                   delete cache.inflight[k];
-               }
-           });
+               for (k = 0; k < nodeIDs.length; k++) {
+                 if (nodeIDs[k] === survivor.id) continue;
 
-           tiles.forEach(function(tile) {
-               loadNextTilePage$1(which, currZoom, url, tile);
-           });
-       }
+                 if (way.areAdjacent(nodeIDs[k], survivor.id)) {
+                   way = way.removeNode(nodeIDs[k]);
+                 } else {
+                   way = way.replaceNode(nodeIDs[k], survivor.id);
+                 }
+               }
 
+               if (way.isDegenerate()) {
+                 return 'restriction';
+               }
+             }
+           }
 
-       function loadNextTilePage$1(which, currZoom, url, tile) {
-           var cache = _oscCache[which];
-           var bbox = tile.extent.bbox();
-           var maxPages = maxPageAtZoom$1(currZoom);
-           var nextPage = cache.nextPage[tile.id] || 1;
-           var params = utilQsString({
-               ipp: maxResults$1,
-               page: nextPage,
-               // client_id: clientId,
-               bbTopLeft: [bbox.maxY, bbox.minX].join(','),
-               bbBottomRight: [bbox.minY, bbox.maxX].join(',')
-           }, true);
-
-           if (nextPage > maxPages) return;
-
-           var id = tile.id + ',' + String(nextPage);
-           if (cache.loaded[id] || cache.inflight[id]) return;
+           return false; // if a key node appears multiple times (indexOf !== lastIndexOf) it's a FROM-VIA or TO-VIA junction
 
-           var controller = new AbortController();
-           cache.inflight[id] = controller;
+           function hasDuplicates(n, i, arr) {
+             return arr.indexOf(n) !== arr.lastIndexOf(n);
+           }
 
-           var options = {
-               method: 'POST',
-               signal: controller.signal,
-               body: params,
-               headers: { 'Content-Type': 'application/x-www-form-urlencoded' }
-           };
+           function keyNodeFilter(froms, tos) {
+             return function (n) {
+               return froms.indexOf(n) === -1 && tos.indexOf(n) === -1;
+             };
+           }
 
-           d3_json(url, options)
-               .then(function(data) {
-                   cache.loaded[id] = true;
-                   delete cache.inflight[id];
-                   if (!data || !data.currentPageItems || !data.currentPageItems.length) {
-                       throw new Error('No Data');
-                   }
+           function collectNodes(member, collection) {
+             var entity = graph.hasEntity(member.id);
+             if (!entity) return;
+             var role = member.role || '';
 
-                   var features = data.currentPageItems.map(function(item) {
-                       var loc = [+item.lng, +item.lat];
-                       var d;
-
-                       if (which === 'images') {
-                           d = {
-                               loc: loc,
-                               key: item.id,
-                               ca: +item.heading,
-                               captured_at: (item.shot_date || item.date_added),
-                               captured_by: item.username,
-                               imagePath: item.lth_name,
-                               sequence_id: item.sequence_id,
-                               sequence_index: +item.sequence_index
-                           };
-
-                           // cache sequence info
-                           var seq = _oscCache.sequences[d.sequence_id];
-                           if (!seq) {
-                               seq = { rotation: 0, images: [] };
-                               _oscCache.sequences[d.sequence_id] = seq;
-                           }
-                           seq.images[d.sequence_index] = d;
-                       }
+             if (!collection[role]) {
+               collection[role] = [];
+             }
 
-                       return {
-                           minX: loc[0], minY: loc[1], maxX: loc[0], maxY: loc[1], data: d
-                       };
-                   });
+             if (member.type === 'node') {
+               collection[role].push(member.id);
 
-                   cache.rtree.load(features);
+               if (role === 'via') {
+                 collection.keyfrom.push(member.id);
+                 collection.keyto.push(member.id);
+               }
+             } else if (member.type === 'way') {
+               collection[role].push.apply(collection[role], entity.nodes);
 
-                   if (data.currentPageItems.length === maxResults$1) {  // more pages to load
-                       cache.nextPage[tile.id] = nextPage + 1;
-                       loadNextTilePage$1(which, currZoom, url, tile);
-                   } else {
-                       cache.nextPage[tile.id] = Infinity;     // no more pages to load
-                   }
+               if (role === 'from' || role === 'via') {
+                 collection.keyfrom.push(entity.first());
+                 collection.keyfrom.push(entity.last());
+               }
 
-                   if (which === 'images') {
-                       dispatch$5.call('loadedImages');
-                   }
-               })
-               .catch(function() {
-                   cache.loaded[id] = true;
-                   delete cache.inflight[id];
-               });
+               if (role === 'to' || role === 'via') {
+                 collection.keyto.push(entity.first());
+                 collection.keyto.push(entity.last());
+               }
+             }
+           }
+         };
+
+         return action;
        }
 
+       function actionCopyEntities(ids, fromGraph) {
+         var _copies = {};
 
-       // partition viewport into higher zoom tiles
-       function partitionViewport$1(projection) {
-           var z = geoScaleToZoom(projection.scale());
-           var z2 = (Math.ceil(z * 2) / 2) + 2.5;   // round to next 0.5 and add 2.5
-           var tiler = utilTiler().zoomExtent([z2, z2]);
+         var action = function action(graph) {
+           ids.forEach(function (id) {
+             fromGraph.entity(id).copy(fromGraph, _copies);
+           });
 
-           return tiler.getTiles(projection)
-               .map(function(tile) { return tile.extent; });
-       }
+           for (var id in _copies) {
+             graph = graph.replace(_copies[id]);
+           }
 
+           return graph;
+         };
 
-       // no more than `limit` results per partition.
-       function searchLimited$1(limit, projection, rtree) {
-           limit = limit || 5;
+         action.copies = function () {
+           return _copies;
+         };
 
-           return partitionViewport$1(projection)
-               .reduce(function(result, extent) {
-                   var found = rtree.search(extent.bbox())
-                       .slice(0, limit)
-                       .map(function(d) { return d.data; });
+         return action;
+       }
 
-                   return (found.length ? result.concat(found) : result);
-               }, []);
+       function actionDeleteMember(relationId, memberIndex) {
+         return function (graph) {
+           var relation = graph.entity(relationId).removeMember(memberIndex);
+           graph = graph.replace(relation);
+           if (relation.isDegenerate()) graph = actionDeleteRelation(relation.id)(graph);
+           return graph;
+         };
        }
 
+       function actionDiscardTags(difference, discardTags) {
+         discardTags = discardTags || {};
+         return function (graph) {
+           difference.modified().forEach(checkTags);
+           difference.created().forEach(checkTags);
+           return graph;
+
+           function checkTags(entity) {
+             var keys = Object.keys(entity.tags);
+             var didDiscard = false;
+             var tags = {};
 
-       var serviceOpenstreetcam = {
+             for (var i = 0; i < keys.length; i++) {
+               var k = keys[i];
 
-           init: function() {
-               if (!_oscCache) {
-                   this.reset();
+               if (discardTags[k] || !entity.tags[k]) {
+                 didDiscard = true;
+               } else {
+                 tags[k] = entity.tags[k];
                }
+             }
 
-               this.event = utilRebind(this, dispatch$5, 'on');
-           },
+             if (didDiscard) {
+               graph = graph.replace(entity.update({
+                 tags: tags
+               }));
+             }
+           }
+         };
+       }
 
-           reset: function() {
-               if (_oscCache) {
-                   Object.values(_oscCache.images.inflight).forEach(abortRequest$4);
-               }
+       //
+       // Optionally, disconnect only the given ways.
+       //
+       // For testing convenience, accepts an ID to assign to the (first) new node.
+       // Normally, this will be undefined and the way will automatically
+       // be assigned a new ID.
+       //
+       // This is the inverse of `iD.actionConnect`.
+       //
+       // Reference:
+       //   https://github.com/openstreetmap/potlatch2/blob/master/net/systemeD/halcyon/connection/actions/UnjoinNodeAction.as
+       //   https://github.com/openstreetmap/josm/blob/mirror/src/org/openstreetmap/josm/actions/UnGlueAction.java
+       //
 
-               _oscCache = {
-                   images: { inflight: {}, loaded: {}, nextPage: {}, rtree: new RBush() },
-                   sequences: {}
-               };
+       function actionDisconnect(nodeId, newNodeId) {
+         var wayIds;
+
+         var action = function action(graph) {
+           var node = graph.entity(nodeId);
+           var connections = action.connections(graph);
+           connections.forEach(function (connection) {
+             var way = graph.entity(connection.wayID);
+             var newNode = osmNode({
+               id: newNodeId,
+               loc: node.loc,
+               tags: node.tags
+             });
+             graph = graph.replace(newNode);
+
+             if (connection.index === 0 && way.isArea()) {
+               // replace shared node with shared node..
+               graph = graph.replace(way.replaceNode(way.nodes[0], newNode.id));
+             } else if (way.isClosed() && connection.index === way.nodes.length - 1) {
+               // replace closing node with new new node..
+               graph = graph.replace(way.unclose().addNode(newNode.id));
+             } else {
+               // replace shared node with multiple new nodes..
+               graph = graph.replace(way.updateNode(newNode.id, connection.index));
+             }
+           });
+           return graph;
+         };
 
-               _oscSelectedImage = null;
-           },
+         action.connections = function (graph) {
+           var candidates = [];
+           var keeping = false;
+           var parentWays = graph.parentWays(graph.entity(nodeId));
+           var way, waynode;
 
+           for (var i = 0; i < parentWays.length; i++) {
+             way = parentWays[i];
 
-           images: function(projection) {
-               var limit = 5;
-               return searchLimited$1(limit, projection, _oscCache.images.rtree);
-           },
+             if (wayIds && wayIds.indexOf(way.id) === -1) {
+               keeping = true;
+               continue;
+             }
 
+             if (way.isArea() && way.nodes[0] === nodeId) {
+               candidates.push({
+                 wayID: way.id,
+                 index: 0
+               });
+             } else {
+               for (var j = 0; j < way.nodes.length; j++) {
+                 waynode = way.nodes[j];
 
-           sequences: function(projection) {
-               var viewport = projection.clipExtent();
-               var min = [viewport[0][0], viewport[1][1]];
-               var max = [viewport[1][0], viewport[0][1]];
-               var bbox = geoExtent(projection.invert(min), projection.invert(max)).bbox();
-               var sequenceKeys = {};
-
-               // all sequences for images in viewport
-               _oscCache.images.rtree.search(bbox)
-                   .forEach(function(d) { sequenceKeys[d.data.sequence_id] = true; });
-
-               // make linestrings from those sequences
-               var lineStrings = [];
-               Object.keys(sequenceKeys)
-                   .forEach(function(sequenceKey) {
-                       var seq = _oscCache.sequences[sequenceKey];
-                       var images = seq && seq.images;
-                       if (images) {
-                           lineStrings.push({
-                               type: 'LineString',
-                               coordinates: images.map(function (d) { return d.loc; }).filter(Boolean),
-                               properties: { key: sequenceKey }
-                           });
-                       }
+                 if (waynode === nodeId) {
+                   if (way.isClosed() && parentWays.length > 1 && wayIds && wayIds.indexOf(way.id) !== -1 && j === way.nodes.length - 1) {
+                     continue;
+                   }
+
+                   candidates.push({
+                     wayID: way.id,
+                     index: j
                    });
-               return lineStrings;
-           },
+                 }
+               }
+             }
+           }
 
+           return keeping ? candidates : candidates.slice(1);
+         };
 
-           loadImages: function(projection) {
-               var url = apibase$2 + '/1.0/list/nearby-photos/';
-               loadTiles$1('images', url, projection);
-           },
+         action.disabled = function (graph) {
+           var connections = action.connections(graph);
+           if (connections.length === 0) return 'not_connected';
+           var parentWays = graph.parentWays(graph.entity(nodeId));
+           var seenRelationIds = {};
+           var sharedRelation;
+           parentWays.forEach(function (way) {
+             var relations = graph.parentRelations(way);
+             relations.forEach(function (relation) {
+               if (relation.id in seenRelationIds) {
+                 if (wayIds) {
+                   if (wayIds.indexOf(way.id) !== -1 || wayIds.indexOf(seenRelationIds[relation.id]) !== -1) {
+                     sharedRelation = relation;
+                   }
+                 } else {
+                   sharedRelation = relation;
+                 }
+               } else {
+                 seenRelationIds[relation.id] = way.id;
+               }
+             });
+           });
+           if (sharedRelation) return 'relation';
+         };
 
+         action.limitWays = function (val) {
+           if (!arguments.length) return wayIds;
+           wayIds = val;
+           return action;
+         };
 
-           loadViewer: function(context) {
-               var that = this;
+         return action;
+       }
 
-               // add osc-wrapper
-               var wrap = context.container().select('.photoviewer').selectAll('.osc-wrapper')
-                   .data([0]);
+       var geojsonRewind = rewind;
 
-               var wrapEnter = wrap.enter()
-                   .append('div')
-                   .attr('class', 'photo-wrapper osc-wrapper')
-                   .classed('hide', true)
-                   .call(imgZoom.on('zoom', zoomPan))
-                   .on('dblclick.zoom', null);
+       function rewind(gj, outer) {
+         var type = gj && gj.type,
+             i;
 
-               wrapEnter
-                   .append('div')
-                   .attr('class', 'photo-attribution fillD');
+         if (type === 'FeatureCollection') {
+           for (i = 0; i < gj.features.length; i++) {
+             rewind(gj.features[i], outer);
+           }
+         } else if (type === 'GeometryCollection') {
+           for (i = 0; i < gj.geometries.length; i++) {
+             rewind(gj.geometries[i], outer);
+           }
+         } else if (type === 'Feature') {
+           rewind(gj.geometry, outer);
+         } else if (type === 'Polygon') {
+           rewindRings(gj.coordinates, outer);
+         } else if (type === 'MultiPolygon') {
+           for (i = 0; i < gj.coordinates.length; i++) {
+             rewindRings(gj.coordinates[i], outer);
+           }
+         }
 
-               var controlsEnter = wrapEnter
-                   .append('div')
-                   .attr('class', 'photo-controls-wrap')
-                   .append('div')
-                   .attr('class', 'photo-controls');
+         return gj;
+       }
 
-               controlsEnter
-                   .append('button')
-                   .on('click.back', step(-1))
-                   .text('◄');
+       function rewindRings(rings, outer) {
+         if (rings.length === 0) return;
+         rewindRing(rings[0], outer);
 
-               controlsEnter
-                   .append('button')
-                   .on('click.rotate-ccw', rotate(-90))
-                   .text('⤿');
+         for (var i = 1; i < rings.length; i++) {
+           rewindRing(rings[i], !outer);
+         }
+       }
 
-               controlsEnter
-                   .append('button')
-                   .on('click.rotate-cw', rotate(90))
-                   .text('⤾');
+       function rewindRing(ring, dir) {
+         var area = 0;
 
-               controlsEnter
-                   .append('button')
-                   .on('click.forward', step(1))
-                   .text('►');
+         for (var i = 0, len = ring.length, j = len - 1; i < len; j = i++) {
+           area += (ring[i][0] - ring[j][0]) * (ring[j][1] + ring[i][1]);
+         }
 
-               wrapEnter
-                   .append('div')
-                   .attr('class', 'osc-image-wrap');
+         if (area >= 0 !== !!dir) ring.reverse();
+       }
 
+       function actionExtract(entityID) {
+         var extractedNodeID;
 
-               // Register viewer resize handler
-               context.ui().photoviewer.on('resize.openstreetcam', function(dimensions) {
-                   imgZoom = d3_zoom()
-                       .extent([[0, 0], dimensions])
-                       .translateExtent([[0, 0], dimensions])
-                       .scaleExtent([1, 15])
-                       .on('zoom', zoomPan);
-               });
+         var action = function action(graph) {
+           var entity = graph.entity(entityID);
 
+           if (entity.type === 'node') {
+             return extractFromNode(entity, graph);
+           }
 
-               function zoomPan() {
-                   var t = event.transform;
-                   context.container().select('.photoviewer .osc-image-wrap')
-                       .call(utilSetTransform, t.x, t.y, t.k);
-               }
+           return extractFromWayOrRelation(entity, graph);
+         };
 
+         function extractFromNode(node, graph) {
+           extractedNodeID = node.id; // Create a new node to replace the one we will detach
 
-               function rotate(deg) {
-                   return function() {
-                       if (!_oscSelectedImage) return;
-                       var sequenceKey = _oscSelectedImage.sequence_id;
-                       var sequence = _oscCache.sequences[sequenceKey];
-                       if (!sequence) return;
+           var replacement = osmNode({
+             loc: node.loc
+           });
+           graph = graph.replace(replacement); // Process each way in turn, updating the graph as we go
 
-                       var r = sequence.rotation || 0;
-                       r += deg;
+           graph = graph.parentWays(node).reduce(function (accGraph, parentWay) {
+             return accGraph.replace(parentWay.replaceNode(entityID, replacement.id));
+           }, graph); // Process any relations too
 
-                       if (r > 180) r -= 360;
-                       if (r < -180) r += 360;
-                       sequence.rotation = r;
+           return graph.parentRelations(node).reduce(function (accGraph, parentRel) {
+             return accGraph.replace(parentRel.replaceMember(node, replacement));
+           }, graph);
+         }
 
-                       var wrap = context.container().select('.photoviewer .osc-wrapper');
+         function extractFromWayOrRelation(entity, graph) {
+           var fromGeometry = entity.geometry(graph);
+           var keysToCopyAndRetain = ['source', 'wheelchair'];
+           var keysToRetain = ['area'];
+           var buildingKeysToRetain = ['architect', 'building', 'height', 'layer']; // d3_geoCentroid is wrong for counterclockwise-wound polygons, so wind them clockwise
 
-                       wrap
-                           .transition()
-                           .duration(100)
-                           .call(imgZoom.transform, identity$2);
+           var extractedLoc = d3_geoCentroid(geojsonRewind(Object.assign({}, entity.asGeoJSON(graph)), true));
 
-                       wrap.selectAll('.osc-image')
-                           .transition()
-                           .duration(100)
-                           .style('transform', 'rotate(' + r + 'deg)');
-                   };
-               }
+           if (!extractedLoc || !isFinite(extractedLoc[0]) || !isFinite(extractedLoc[1])) {
+             extractedLoc = entity.extent(graph).center();
+           }
 
-               function step(stepBy) {
-                   return function() {
-                       if (!_oscSelectedImage) return;
-                       var sequenceKey = _oscSelectedImage.sequence_id;
-                       var sequence = _oscCache.sequences[sequenceKey];
-                       if (!sequence) return;
+           var indoorAreaValues = {
+             area: true,
+             corridor: true,
+             elevator: true,
+             level: true,
+             room: true
+           };
+           var isBuilding = entity.tags.building && entity.tags.building !== 'no' || entity.tags['building:part'] && entity.tags['building:part'] !== 'no';
+           var isIndoorArea = fromGeometry === 'area' && entity.tags.indoor && indoorAreaValues[entity.tags.indoor];
+           var entityTags = Object.assign({}, entity.tags); // shallow copy
 
-                       var nextIndex = _oscSelectedImage.sequence_index + stepBy;
-                       var nextImage = sequence.images[nextIndex];
-                       if (!nextImage) return;
+           var pointTags = {};
 
-                       context.map().centerEase(nextImage.loc);
+           for (var key in entityTags) {
+             if (entity.type === 'relation' && key === 'type') {
+               continue;
+             }
 
-                       that
-                           .selectImage(context, nextImage)
-                           .updateViewer(context, nextImage);
-                   };
-               }
-           },
+             if (keysToRetain.indexOf(key) !== -1) {
+               continue;
+             }
 
+             if (isBuilding) {
+               // don't transfer building-related tags
+               if (buildingKeysToRetain.indexOf(key) !== -1 || key.match(/^building:.{1,}/) || key.match(/^roof:.{1,}/)) continue;
+             } // leave `indoor` tag on the area
 
-           showViewer: function(context) {
-               var viewer = context.container().select('.photoviewer')
-                   .classed('hide', false);
 
-               var isHidden = viewer.selectAll('.photo-wrapper.osc-wrapper.hide').size();
+             if (isIndoorArea && key === 'indoor') {
+               continue;
+             } // copy the tag from the entity to the point
 
-               if (isHidden) {
-                   viewer
-                       .selectAll('.photo-wrapper:not(.osc-wrapper)')
-                       .classed('hide', true);
 
-                   viewer
-                       .selectAll('.photo-wrapper.osc-wrapper')
-                       .classed('hide', false);
-               }
+             pointTags[key] = entityTags[key]; // leave addresses and some other tags so they're on both features
 
-               return this;
-           },
+             if (keysToCopyAndRetain.indexOf(key) !== -1 || key.match(/^addr:.{1,}/)) {
+               continue;
+             } else if (isIndoorArea && key === 'level') {
+               // leave `level` on both features
+               continue;
+             } // remove the tag from the entity
 
 
-           hideViewer: function(context) {
-               _oscSelectedImage = null;
+             delete entityTags[key];
+           }
 
-               var viewer = context.container().select('.photoviewer');
-               if (!viewer.empty()) viewer.datum(null);
+           if (!isBuilding && !isIndoorArea && fromGeometry === 'area') {
+             // ensure that areas keep area geometry
+             entityTags.area = 'yes';
+           }
 
-               viewer
-                   .classed('hide', true)
-                   .selectAll('.photo-wrapper')
-                   .classed('hide', true);
+           var replacement = osmNode({
+             loc: extractedLoc,
+             tags: pointTags
+           });
+           graph = graph.replace(replacement);
+           extractedNodeID = replacement.id;
+           return graph.replace(entity.update({
+             tags: entityTags
+           }));
+         }
 
-               context.container().selectAll('.viewfield-group, .sequence, .icon-sign')
-                   .classed('currentView', false);
+         action.getExtractedNodeID = function () {
+           return extractedNodeID;
+         };
 
-               return this.setStyles(context, null, true);
-           },
+         return action;
+       }
 
+       //
+       // This is the inverse of `iD.actionSplit`.
+       //
+       // Reference:
+       //   https://github.com/systemed/potlatch2/blob/master/net/systemeD/halcyon/connection/actions/MergeWaysAction.as
+       //   https://github.com/openstreetmap/josm/blob/mirror/src/org/openstreetmap/josm/actions/CombineWayAction.java
+       //
 
-           updateViewer: function(context, d) {
-               var wrap = context.container().select('.photoviewer .osc-wrapper');
-               var imageWrap = wrap.selectAll('.osc-image-wrap');
-               var attribution = wrap.selectAll('.photo-attribution').html('');
-
-               wrap
-                   .transition()
-                   .duration(100)
-                   .call(imgZoom.transform, identity$2);
-
-               imageWrap
-                   .selectAll('.osc-image')
-                   .remove();
-
-               if (d) {
-                   var sequence = _oscCache.sequences[d.sequence_id];
-                   var r = (sequence && sequence.rotation) || 0;
-
-                   imageWrap
-                       .append('img')
-                       .attr('class', 'osc-image')
-                       .attr('src', apibase$2 + '/' + d.imagePath)
-                       .style('transform', 'rotate(' + r + 'deg)');
-
-                   if (d.captured_by) {
-                       attribution
-                           .append('a')
-                           .attr('class', 'captured_by')
-                           .attr('target', '_blank')
-                           .attr('href', 'https://openstreetcam.org/user/' + encodeURIComponent(d.captured_by))
-                           .text('@' + d.captured_by);
-
-                       attribution
-                           .append('span')
-                           .text('|');
-                   }
+       function actionJoin(ids) {
+         function groupEntitiesByGeometry(graph) {
+           var entities = ids.map(function (id) {
+             return graph.entity(id);
+           });
+           return Object.assign({
+             line: []
+           }, utilArrayGroupBy(entities, function (entity) {
+             return entity.geometry(graph);
+           }));
+         }
+
+         var action = function action(graph) {
+           var ways = ids.map(graph.entity, graph);
+           var survivorID = ways[0].id; // if any of the ways are sided (e.g. coastline, cliff, kerb)
+           // sort them first so they establish the overall order - #6033
+
+           ways.sort(function (a, b) {
+             var aSided = a.isSided();
+             var bSided = b.isSided();
+             return aSided && !bSided ? -1 : bSided && !aSided ? 1 : 0;
+           }); // Prefer to keep an existing way.
+
+           for (var i = 0; i < ways.length; i++) {
+             if (!ways[i].isNew()) {
+               survivorID = ways[i].id;
+               break;
+             }
+           }
 
-                   if (d.captured_at) {
-                       attribution
-                           .append('span')
-                           .attr('class', 'captured_at')
-                           .text(localeDateString(d.captured_at));
+           var sequences = osmJoinWays(ways, graph);
+           var joined = sequences[0]; // We might need to reverse some of these ways before joining them.  #4688
+           // `joined.actions` property will contain any actions we need to apply.
 
-                       attribution
-                           .append('span')
-                           .text('|');
-                   }
+           graph = sequences.actions.reduce(function (g, action) {
+             return action(g);
+           }, graph);
+           var survivor = graph.entity(survivorID);
+           survivor = survivor.update({
+             nodes: joined.nodes.map(function (n) {
+               return n.id;
+             })
+           });
+           graph = graph.replace(survivor);
+           joined.forEach(function (way) {
+             if (way.id === survivorID) return;
+             graph.parentRelations(way).forEach(function (parent) {
+               graph = graph.replace(parent.replaceMember(way, survivor));
+             });
+             survivor = survivor.mergeTags(way.tags);
+             graph = graph.replace(survivor);
+             graph = actionDeleteWay(way.id)(graph);
+           }); // Finds if the join created a single-member multipolygon,
+           // and if so turns it into a basic area instead
 
-                   attribution
-                       .append('a')
-                       .attr('class', 'image-link')
-                       .attr('target', '_blank')
-                       .attr('href', 'https://openstreetcam.org/details/' + d.sequence_id + '/' + d.sequence_index)
-                       .text('openstreetcam.org');
-               }
+           function checkForSimpleMultipolygon() {
+             if (!survivor.isClosed()) return;
+             var multipolygons = graph.parentMultipolygons(survivor).filter(function (multipolygon) {
+               // find multipolygons where the survivor is the only member
+               return multipolygon.members.length === 1;
+             }); // skip if this is the single member of multiple multipolygons
 
-               return this;
+             if (multipolygons.length !== 1) return;
+             var multipolygon = multipolygons[0];
 
+             for (var key in survivor.tags) {
+               if (multipolygon.tags[key] && // don't collapse if tags cannot be cleanly merged
+               multipolygon.tags[key] !== survivor.tags[key]) return;
+             }
 
-               function localeDateString(s) {
-                   if (!s) return null;
-                   var options = { day: 'numeric', month: 'short', year: 'numeric' };
-                   var d = new Date(s);
-                   if (isNaN(d.getTime())) return null;
-                   return d.toLocaleDateString(_mainLocalizer.localeCode(), options);
-               }
-           },
+             survivor = survivor.mergeTags(multipolygon.tags);
+             graph = graph.replace(survivor);
+             graph = actionDeleteRelation(multipolygon.id, true
+             /* allow untagged members */
+             )(graph);
+             var tags = Object.assign({}, survivor.tags);
 
+             if (survivor.geometry(graph) !== 'area') {
+               // ensure the feature persists as an area
+               tags.area = 'yes';
+             }
 
-           selectImage: function(context, d) {
-               _oscSelectedImage = d;
-               var viewer = context.container().select('.photoviewer');
-               if (!viewer.empty()) viewer.datum(d);
+             delete tags.type; // remove type=multipolygon
 
-               this.setStyles(context, null, true);
+             survivor = survivor.update({
+               tags: tags
+             });
+             graph = graph.replace(survivor);
+           }
 
-               context.container().selectAll('.icon-sign')
-                   .classed('currentView', false);
+           checkForSimpleMultipolygon();
+           return graph;
+         }; // Returns the number of nodes the resultant way is expected to have
 
-               return this;
-           },
 
+         action.resultingWayNodesLength = function (graph) {
+           return ids.reduce(function (count, id) {
+             return count + graph.entity(id).nodes.length;
+           }, 0) - ids.length - 1;
+         };
 
-           getSelectedImage: function() {
-               return _oscSelectedImage;
-           },
+         action.disabled = function (graph) {
+           var geometries = groupEntitiesByGeometry(graph);
 
+           if (ids.length < 2 || ids.length !== geometries.line.length) {
+             return 'not_eligible';
+           }
 
-           getSequenceKeyForImage: function(d) {
-               return d && d.sequence_id;
-           },
+           var joined = osmJoinWays(ids.map(graph.entity, graph), graph);
 
+           if (joined.length > 1) {
+             return 'not_adjacent';
+           } // Loop through all combinations of path-pairs
+           // to check potential intersections between all pairs
 
-           // Updates the currently highlighted sequence and selected bubble.
-           // Reset is only necessary when interacting with the viewport because
-           // this implicitly changes the currently selected bubble/sequence
-           setStyles: function(context, hovered, reset) {
-               if (reset) {  // reset all layers
-                   context.container().selectAll('.viewfield-group')
-                       .classed('highlighted', false)
-                       .classed('hovered', false)
-                       .classed('currentView', false);
 
-                   context.container().selectAll('.sequence')
-                       .classed('highlighted', false)
-                       .classed('currentView', false);
-               }
+           for (var i = 0; i < ids.length - 1; i++) {
+             for (var j = i + 1; j < ids.length; j++) {
+               var path1 = graph.childNodes(graph.entity(ids[i])).map(function (e) {
+                 return e.loc;
+               });
+               var path2 = graph.childNodes(graph.entity(ids[j])).map(function (e) {
+                 return e.loc;
+               });
+               var intersections = geoPathIntersections(path1, path2); // Check if intersections are just nodes lying on top of
+               // each other/the line, as opposed to crossing it
 
-               var hoveredImageKey = hovered && hovered.key;
-               var hoveredSequenceKey = this.getSequenceKeyForImage(hovered);
-               var hoveredSequence = hoveredSequenceKey && _oscCache.sequences[hoveredSequenceKey];
-               var hoveredImageKeys = (hoveredSequence && hoveredSequence.images.map(function (d) { return d.key; })) || [];
+               var common = utilArrayIntersection(joined[0].nodes.map(function (n) {
+                 return n.loc.toString();
+               }), intersections.map(function (n) {
+                 return n.toString();
+               }));
 
-               var viewer = context.container().select('.photoviewer');
-               var selected = viewer.empty() ? undefined : viewer.datum();
-               var selectedImageKey = selected && selected.key;
-               var selectedSequenceKey = this.getSequenceKeyForImage(selected);
-               var selectedSequence = selectedSequenceKey && _oscCache.sequences[selectedSequenceKey];
-               var selectedImageKeys = (selectedSequence && selectedSequence.images.map(function (d) { return d.key; })) || [];
-
-               // highlight sibling viewfields on either the selected or the hovered sequences
-               var highlightedImageKeys = utilArrayUnion(hoveredImageKeys, selectedImageKeys);
-
-               context.container().selectAll('.layer-openstreetcam .viewfield-group')
-                   .classed('highlighted', function(d) { return highlightedImageKeys.indexOf(d.key) !== -1; })
-                   .classed('hovered', function(d) { return d.key === hoveredImageKey; })
-                   .classed('currentView', function(d) { return d.key === selectedImageKey; });
-
-               context.container().selectAll('.layer-openstreetcam .sequence')
-                   .classed('highlighted', function(d) { return d.properties.key === hoveredSequenceKey; })
-                   .classed('currentView', function(d) { return d.properties.key === selectedSequenceKey; });
-
-               // update viewfields if needed
-               context.container().selectAll('.viewfield-group .viewfield')
-                   .attr('d', viewfieldPath);
-
-               function viewfieldPath() {
-                   var d = this.parentNode.__data__;
-                   if (d.pano && d.key !== selectedImageKey) {
-                       return 'M 8,13 m -10,0 a 10,10 0 1,0 20,0 a 10,10 0 1,0 -20,0';
-                   } else {
-                       return 'M 6,9 C 8,8.4 8,8.4 10,9 L 16,-2 C 12,-5 4,-5 0,-2 z';
-                   }
+               if (common.length !== intersections.length) {
+                 return 'paths_intersect';
                }
+             }
+           }
 
-               return this;
-           },
+           var nodeIds = joined[0].nodes.map(function (n) {
+             return n.id;
+           }).slice(1, -1);
+           var relation;
+           var tags = {};
+           var conflicting = false;
+           joined[0].forEach(function (way) {
+             var parents = graph.parentRelations(way);
+             parents.forEach(function (parent) {
+               if (parent.isRestriction() && parent.members.some(function (m) {
+                 return nodeIds.indexOf(m.id) >= 0;
+               })) {
+                 relation = parent;
+               }
+             });
 
+             for (var k in way.tags) {
+               if (!(k in tags)) {
+                 tags[k] = way.tags[k];
+               } else if (tags[k] && osmIsInterestingTag(k) && tags[k] !== way.tags[k]) {
+                 conflicting = true;
+               }
+             }
+           });
 
-           cache: function() {
-               return _oscCache;
+           if (relation) {
+             return 'restriction';
            }
 
-       };
+           if (conflicting) {
+             return 'conflicting_tags';
+           }
+         };
 
-       /**
-        * Checks if `value` is the
-        * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
-        * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
-        *
-        * @static
-        * @memberOf _
-        * @since 0.1.0
-        * @category Lang
-        * @param {*} value The value to check.
-        * @returns {boolean} Returns `true` if `value` is an object, else `false`.
-        * @example
-        *
-        * _.isObject({});
-        * // => true
-        *
-        * _.isObject([1, 2, 3]);
-        * // => true
-        *
-        * _.isObject(_.noop);
-        * // => true
-        *
-        * _.isObject(null);
-        * // => false
-        */
-       function isObject$1(value) {
-         var type = typeof value;
-         return value != null && (type == 'object' || type == 'function');
+         return action;
        }
 
-       /** Detect free variable `global` from Node.js. */
-       var freeGlobal = typeof global == 'object' && global && global.Object === Object && global;
+       function actionMerge(ids) {
+         function groupEntitiesByGeometry(graph) {
+           var entities = ids.map(function (id) {
+             return graph.entity(id);
+           });
+           return Object.assign({
+             point: [],
+             area: [],
+             line: [],
+             relation: []
+           }, utilArrayGroupBy(entities, function (entity) {
+             return entity.geometry(graph);
+           }));
+         }
+
+         var action = function action(graph) {
+           var geometries = groupEntitiesByGeometry(graph);
+           var target = geometries.area[0] || geometries.line[0];
+           var points = geometries.point;
+           points.forEach(function (point) {
+             target = target.mergeTags(point.tags);
+             graph = graph.replace(target);
+             graph.parentRelations(point).forEach(function (parent) {
+               graph = graph.replace(parent.replaceMember(point, target));
+             });
+             var nodes = utilArrayUniq(graph.childNodes(target));
+             var removeNode = point;
 
-       /** Detect free variable `self`. */
-       var freeSelf = typeof self == 'object' && self && self.Object === Object && self;
+             for (var i = 0; i < nodes.length; i++) {
+               var node = nodes[i];
 
-       /** Used as a reference to the global object. */
-       var root$2 = freeGlobal || freeSelf || Function('return this')();
+               if (graph.parentWays(node).length > 1 || graph.parentRelations(node).length || node.hasInterestingTags()) {
+                 continue;
+               } // Found an uninteresting child node on the target way.
+               // Move orig point into its place to preserve point's history. #3683
 
-       /**
-        * Gets the timestamp of the number of milliseconds that have elapsed since
-        * the Unix epoch (1 January 1970 00:00:00 UTC).
-        *
-        * @static
-        * @memberOf _
-        * @since 2.4.0
-        * @category Date
-        * @returns {number} Returns the timestamp.
-        * @example
-        *
-        * _.defer(function(stamp) {
-        *   console.log(_.now() - stamp);
-        * }, _.now());
-        * // => Logs the number of milliseconds it took for the deferred invocation.
-        */
-       var now$1 = function() {
-         return root$2.Date.now();
-       };
 
-       /** Built-in value references. */
-       var Symbol$1 = root$2.Symbol;
+               graph = graph.replace(point.update({
+                 tags: {},
+                 loc: node.loc
+               }));
+               target = target.replaceNode(node.id, point.id);
+               graph = graph.replace(target);
+               removeNode = node;
+               break;
+             }
 
-       /** Used for built-in method references. */
-       var objectProto = Object.prototype;
+             graph = graph.remove(removeNode);
+           });
 
-       /** Used to check objects for own properties. */
-       var hasOwnProperty$2 = objectProto.hasOwnProperty;
+           if (target.tags.area === 'yes') {
+             var tags = Object.assign({}, target.tags); // shallow copy
 
-       /**
-        * Used to resolve the
-        * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
-        * of values.
-        */
-       var nativeObjectToString = objectProto.toString;
+             delete tags.area;
 
-       /** Built-in value references. */
-       var symToStringTag = Symbol$1 ? Symbol$1.toStringTag : undefined;
+             if (osmTagSuggestingArea(tags)) {
+               // remove the `area` tag if area geometry is now implied - #3851
+               target = target.update({
+                 tags: tags
+               });
+               graph = graph.replace(target);
+             }
+           }
 
-       /**
-        * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
-        *
-        * @private
-        * @param {*} value The value to query.
-        * @returns {string} Returns the raw `toStringTag`.
-        */
-       function getRawTag(value) {
-         var isOwn = hasOwnProperty$2.call(value, symToStringTag),
-             tag = value[symToStringTag];
+           return graph;
+         };
 
-         try {
-           value[symToStringTag] = undefined;
-           var unmasked = true;
-         } catch (e) {}
+         action.disabled = function (graph) {
+           var geometries = groupEntitiesByGeometry(graph);
 
-         var result = nativeObjectToString.call(value);
-         if (unmasked) {
-           if (isOwn) {
-             value[symToStringTag] = tag;
-           } else {
-             delete value[symToStringTag];
+           if (geometries.point.length === 0 || geometries.area.length + geometries.line.length !== 1 || geometries.relation.length !== 0) {
+             return 'not_eligible';
            }
-         }
-         return result;
+         };
+
+         return action;
        }
 
-       /** Used for built-in method references. */
-       var objectProto$1 = Object.prototype;
+       //
+       // 1. move all the nodes to a common location
+       // 2. `actionConnect` them
 
-       /**
-        * Used to resolve the
-        * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
-        * of values.
-        */
-       var nativeObjectToString$1 = objectProto$1.toString;
+       function actionMergeNodes(nodeIDs, loc) {
+         // If there is a single "interesting" node, use that as the location.
+         // Otherwise return the average location of all the nodes.
+         function chooseLoc(graph) {
+           if (!nodeIDs.length) return null;
+           var sum = [0, 0];
+           var interestingCount = 0;
+           var interestingLoc;
 
-       /**
-        * Converts `value` to a string using `Object.prototype.toString`.
-        *
-        * @private
-        * @param {*} value The value to convert.
-        * @returns {string} Returns the converted string.
-        */
-       function objectToString$2(value) {
-         return nativeObjectToString$1.call(value);
-       }
+           for (var i = 0; i < nodeIDs.length; i++) {
+             var node = graph.entity(nodeIDs[i]);
 
-       /** `Object#toString` result references. */
-       var nullTag = '[object Null]',
-           undefinedTag = '[object Undefined]';
+             if (node.hasInterestingTags()) {
+               interestingLoc = ++interestingCount === 1 ? node.loc : null;
+             }
 
-       /** Built-in value references. */
-       var symToStringTag$1 = Symbol$1 ? Symbol$1.toStringTag : undefined;
+             sum = geoVecAdd(sum, node.loc);
+           }
 
-       /**
-        * The base implementation of `getTag` without fallbacks for buggy environments.
-        *
-        * @private
-        * @param {*} value The value to query.
-        * @returns {string} Returns the `toStringTag`.
-        */
-       function baseGetTag(value) {
-         if (value == null) {
-           return value === undefined ? undefinedTag : nullTag;
+           return interestingLoc || geoVecScale(sum, 1 / nodeIDs.length);
          }
-         return (symToStringTag$1 && symToStringTag$1 in Object(value))
-           ? getRawTag(value)
-           : objectToString$2(value);
-       }
 
-       /**
-        * Checks if `value` is object-like. A value is object-like if it's not `null`
-        * and has a `typeof` result of "object".
-        *
-        * @static
-        * @memberOf _
-        * @since 4.0.0
-        * @category Lang
-        * @param {*} value The value to check.
-        * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
-        * @example
-        *
-        * _.isObjectLike({});
-        * // => true
-        *
-        * _.isObjectLike([1, 2, 3]);
-        * // => true
-        *
-        * _.isObjectLike(_.noop);
-        * // => false
-        *
-        * _.isObjectLike(null);
-        * // => false
-        */
-       function isObjectLike(value) {
-         return value != null && typeof value == 'object';
-       }
+         var action = function action(graph) {
+           if (nodeIDs.length < 2) return graph;
+           var toLoc = loc;
 
-       /** `Object#toString` result references. */
-       var symbolTag = '[object Symbol]';
+           if (!toLoc) {
+             toLoc = chooseLoc(graph);
+           }
 
-       /**
-        * Checks if `value` is classified as a `Symbol` primitive or object.
-        *
-        * @static
-        * @memberOf _
-        * @since 4.0.0
-        * @category Lang
-        * @param {*} value The value to check.
-        * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
-        * @example
-        *
-        * _.isSymbol(Symbol.iterator);
-        * // => true
-        *
-        * _.isSymbol('abc');
-        * // => false
-        */
-       function isSymbol$4(value) {
-         return typeof value == 'symbol' ||
-           (isObjectLike(value) && baseGetTag(value) == symbolTag);
-       }
+           for (var i = 0; i < nodeIDs.length; i++) {
+             var node = graph.entity(nodeIDs[i]);
 
-       /** Used as references for various `Number` constants. */
-       var NAN = 0 / 0;
+             if (node.loc !== toLoc) {
+               graph = graph.replace(node.move(toLoc));
+             }
+           }
 
-       /** Used to match leading and trailing whitespace. */
-       var reTrim = /^\s+|\s+$/g;
+           return actionConnect(nodeIDs)(graph);
+         };
 
-       /** Used to detect bad signed hexadecimal string values. */
-       var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
+         action.disabled = function (graph) {
+           if (nodeIDs.length < 2) return 'not_eligible';
 
-       /** Used to detect binary string values. */
-       var reIsBinary = /^0b[01]+$/i;
+           for (var i = 0; i < nodeIDs.length; i++) {
+             var entity = graph.entity(nodeIDs[i]);
+             if (entity.type !== 'node') return 'not_eligible';
+           }
 
-       /** Used to detect octal string values. */
-       var reIsOctal = /^0o[0-7]+$/i;
+           return actionConnect(nodeIDs).disabled(graph);
+         };
 
-       /** Built-in method references without a dependency on `root`. */
-       var freeParseInt = parseInt;
+         return action;
+       }
 
-       /**
-        * Converts `value` to a number.
-        *
-        * @static
-        * @memberOf _
-        * @since 4.0.0
-        * @category Lang
-        * @param {*} value The value to process.
-        * @returns {number} Returns the number.
-        * @example
-        *
-        * _.toNumber(3.2);
-        * // => 3.2
-        *
-        * _.toNumber(Number.MIN_VALUE);
-        * // => 5e-324
-        *
-        * _.toNumber(Infinity);
-        * // => Infinity
-        *
-        * _.toNumber('3.2');
-        * // => 3.2
-        */
-       function toNumber(value) {
-         if (typeof value == 'number') {
-           return value;
-         }
-         if (isSymbol$4(value)) {
-           return NAN;
-         }
-         if (isObject$1(value)) {
-           var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
-           value = isObject$1(other) ? (other + '') : other;
-         }
-         if (typeof value != 'string') {
-           return value === 0 ? value : +value;
+       function osmChangeset() {
+         if (!(this instanceof osmChangeset)) {
+           return new osmChangeset().initialize(arguments);
+         } else if (arguments.length) {
+           this.initialize(arguments);
          }
-         value = value.replace(reTrim, '');
-         var isBinary = reIsBinary.test(value);
-         return (isBinary || reIsOctal.test(value))
-           ? freeParseInt(value.slice(2), isBinary ? 2 : 8)
-           : (reIsBadHex.test(value) ? NAN : +value);
        }
+       osmEntity.changeset = osmChangeset;
+       osmChangeset.prototype = Object.create(osmEntity.prototype);
+       Object.assign(osmChangeset.prototype, {
+         type: 'changeset',
+         extent: function extent() {
+           return new geoExtent();
+         },
+         geometry: function geometry() {
+           return 'changeset';
+         },
+         asJXON: function asJXON() {
+           return {
+             osm: {
+               changeset: {
+                 tag: Object.keys(this.tags).map(function (k) {
+                   return {
+                     '@k': k,
+                     '@v': this.tags[k]
+                   };
+                 }, this),
+                 '@version': 0.6,
+                 '@generator': 'iD'
+               }
+             }
+           };
+         },
+         // Generate [osmChange](http://wiki.openstreetmap.org/wiki/OsmChange)
+         // XML. Returns a string.
+         osmChangeJXON: function osmChangeJXON(changes) {
+           var changeset_id = this.id;
 
-       /** Error message constants. */
-       var FUNC_ERROR_TEXT = 'Expected a function';
+           function nest(x, order) {
+             var groups = {};
 
-       /* Built-in method references for those with the same name as other `lodash` methods. */
-       var nativeMax = Math.max,
-           nativeMin = Math.min;
+             for (var i = 0; i < x.length; i++) {
+               var tagName = Object.keys(x[i])[0];
+               if (!groups[tagName]) groups[tagName] = [];
+               groups[tagName].push(x[i][tagName]);
+             }
 
-       /**
-        * Creates a debounced function that delays invoking `func` until after `wait`
-        * milliseconds have elapsed since the last time the debounced function was
-        * invoked. The debounced function comes with a `cancel` method to cancel
-        * delayed `func` invocations and a `flush` method to immediately invoke them.
-        * Provide `options` to indicate whether `func` should be invoked on the
-        * leading and/or trailing edge of the `wait` timeout. The `func` is invoked
-        * with the last arguments provided to the debounced function. Subsequent
-        * calls to the debounced function return the result of the last `func`
-        * invocation.
-        *
-        * **Note:** If `leading` and `trailing` options are `true`, `func` is
-        * invoked on the trailing edge of the timeout only if the debounced function
-        * is invoked more than once during the `wait` timeout.
-        *
-        * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
-        * until to the next tick, similar to `setTimeout` with a timeout of `0`.
-        *
-        * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
-        * for details over the differences between `_.debounce` and `_.throttle`.
-        *
-        * @static
-        * @memberOf _
-        * @since 0.1.0
-        * @category Function
-        * @param {Function} func The function to debounce.
-        * @param {number} [wait=0] The number of milliseconds to delay.
-        * @param {Object} [options={}] The options object.
-        * @param {boolean} [options.leading=false]
-        *  Specify invoking on the leading edge of the timeout.
-        * @param {number} [options.maxWait]
-        *  The maximum time `func` is allowed to be delayed before it's invoked.
-        * @param {boolean} [options.trailing=true]
-        *  Specify invoking on the trailing edge of the timeout.
-        * @returns {Function} Returns the new debounced function.
-        * @example
-        *
-        * // Avoid costly calculations while the window size is in flux.
-        * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
-        *
-        * // Invoke `sendMail` when clicked, debouncing subsequent calls.
-        * jQuery(element).on('click', _.debounce(sendMail, 300, {
-        *   'leading': true,
-        *   'trailing': false
-        * }));
-        *
-        * // Ensure `batchLog` is invoked once after 1 second of debounced calls.
-        * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
-        * var source = new EventSource('/stream');
-        * jQuery(source).on('message', debounced);
-        *
-        * // Cancel the trailing debounced invocation.
-        * jQuery(window).on('popstate', debounced.cancel);
-        */
-       function debounce(func, wait, options) {
-         var lastArgs,
-             lastThis,
-             maxWait,
-             result,
-             timerId,
-             lastCallTime,
-             lastInvokeTime = 0,
-             leading = false,
-             maxing = false,
-             trailing = true;
+             var ordered = {};
+             order.forEach(function (o) {
+               if (groups[o]) ordered[o] = groups[o];
+             });
+             return ordered;
+           } // sort relations in a changeset by dependencies
+
+
+           function sort(changes) {
+             // find a referenced relation in the current changeset
+             function resolve(item) {
+               return relations.find(function (relation) {
+                 return item.keyAttributes.type === 'relation' && item.keyAttributes.ref === relation['@id'];
+               });
+             } // a new item is an item that has not been already processed
+
+
+             function isNew(item) {
+               return !sorted[item['@id']] && !processing.find(function (proc) {
+                 return proc['@id'] === item['@id'];
+               });
+             }
 
-         if (typeof func != 'function') {
-           throw new TypeError(FUNC_ERROR_TEXT);
-         }
-         wait = toNumber(wait) || 0;
-         if (isObject$1(options)) {
-           leading = !!options.leading;
-           maxing = 'maxWait' in options;
-           maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;
-           trailing = 'trailing' in options ? !!options.trailing : trailing;
-         }
+             var processing = [];
+             var sorted = {};
+             var relations = changes.relation;
+             if (!relations) return changes;
 
-         function invokeFunc(time) {
-           var args = lastArgs,
-               thisArg = lastThis;
+             for (var i = 0; i < relations.length; i++) {
+               var relation = relations[i]; // skip relation if already sorted
 
-           lastArgs = lastThis = undefined;
-           lastInvokeTime = time;
-           result = func.apply(thisArg, args);
-           return result;
-         }
+               if (!sorted[relation['@id']]) {
+                 processing.push(relation);
+               }
 
-         function leadingEdge(time) {
-           // Reset any `maxWait` timer.
-           lastInvokeTime = time;
-           // Start the timer for the trailing edge.
-           timerId = setTimeout(timerExpired, wait);
-           // Invoke the leading edge.
-           return leading ? invokeFunc(time) : result;
-         }
+               while (processing.length > 0) {
+                 var next = processing[0],
+                     deps = next.member.map(resolve).filter(Boolean).filter(isNew);
 
-         function remainingWait(time) {
-           var timeSinceLastCall = time - lastCallTime,
-               timeSinceLastInvoke = time - lastInvokeTime,
-               timeWaiting = wait - timeSinceLastCall;
+                 if (deps.length === 0) {
+                   sorted[next['@id']] = next;
+                   processing.shift();
+                 } else {
+                   processing = deps.concat(processing);
+                 }
+               }
+             }
 
-           return maxing
-             ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke)
-             : timeWaiting;
-         }
+             changes.relation = Object.values(sorted);
+             return changes;
+           }
 
-         function shouldInvoke(time) {
-           var timeSinceLastCall = time - lastCallTime,
-               timeSinceLastInvoke = time - lastInvokeTime;
+           function rep(entity) {
+             return entity.asJXON(changeset_id);
+           }
 
-           // Either this is the first call, activity has stopped and we're at the
-           // trailing edge, the system time has gone backwards and we're treating
-           // it as the trailing edge, or we've hit the `maxWait` limit.
-           return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||
-             (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));
+           return {
+             osmChange: {
+               '@version': 0.6,
+               '@generator': 'iD',
+               'create': sort(nest(changes.created.map(rep), ['node', 'way', 'relation'])),
+               'modify': nest(changes.modified.map(rep), ['node', 'way', 'relation']),
+               'delete': Object.assign(nest(changes.deleted.map(rep), ['relation', 'way', 'node']), {
+                 '@if-unused': true
+               })
+             }
+           };
+         },
+         asGeoJSON: function asGeoJSON() {
+           return {};
          }
+       });
 
-         function timerExpired() {
-           var time = now$1();
-           if (shouldInvoke(time)) {
-             return trailingEdge(time);
-           }
-           // Restart the timer.
-           timerId = setTimeout(timerExpired, remainingWait(time));
+       function osmNote() {
+         if (!(this instanceof osmNote)) {
+           return new osmNote().initialize(arguments);
+         } else if (arguments.length) {
+           this.initialize(arguments);
          }
+       }
 
-         function trailingEdge(time) {
-           timerId = undefined;
+       osmNote.id = function () {
+         return osmNote.id.next--;
+       };
 
-           // Only invoke if we have `lastArgs` which means `func` has been
-           // debounced at least once.
-           if (trailing && lastArgs) {
-             return invokeFunc(time);
+       osmNote.id.next = -1;
+       Object.assign(osmNote.prototype, {
+         type: 'note',
+         initialize: function initialize(sources) {
+           for (var i = 0; i < sources.length; ++i) {
+             var source = sources[i];
+
+             for (var prop in source) {
+               if (Object.prototype.hasOwnProperty.call(source, prop)) {
+                 if (source[prop] === undefined) {
+                   delete this[prop];
+                 } else {
+                   this[prop] = source[prop];
+                 }
+               }
+             }
            }
-           lastArgs = lastThis = undefined;
-           return result;
-         }
 
-         function cancel() {
-           if (timerId !== undefined) {
-             clearTimeout(timerId);
+           if (!this.id) {
+             this.id = osmNote.id().toString();
            }
-           lastInvokeTime = 0;
-           lastArgs = lastCallTime = lastThis = timerId = undefined;
+
+           return this;
+         },
+         extent: function extent() {
+           return new geoExtent(this.loc);
+         },
+         update: function update(attrs) {
+           return osmNote(this, attrs); // {v: 1 + (this.v || 0)}
+         },
+         isNew: function isNew() {
+           return this.id < 0;
+         },
+         move: function move(loc) {
+           return this.update({
+             loc: loc
+           });
          }
+       });
 
-         function flush() {
-           return timerId === undefined ? result : trailingEdge(now$1());
+       function osmRelation() {
+         if (!(this instanceof osmRelation)) {
+           return new osmRelation().initialize(arguments);
+         } else if (arguments.length) {
+           this.initialize(arguments);
          }
+       }
+       osmEntity.relation = osmRelation;
+       osmRelation.prototype = Object.create(osmEntity.prototype);
 
-         function debounced() {
-           var time = now$1(),
-               isInvoking = shouldInvoke(time);
+       osmRelation.creationOrder = function (a, b) {
+         var aId = parseInt(osmEntity.id.toOSM(a.id), 10);
+         var bId = parseInt(osmEntity.id.toOSM(b.id), 10);
+         if (aId < 0 || bId < 0) return aId - bId;
+         return bId - aId;
+       };
 
-           lastArgs = arguments;
-           lastThis = this;
-           lastCallTime = time;
+       Object.assign(osmRelation.prototype, {
+         type: 'relation',
+         members: [],
+         copy: function copy(resolver, copies) {
+           if (copies[this.id]) return copies[this.id];
+           var copy = osmEntity.prototype.copy.call(this, resolver, copies);
+           var members = this.members.map(function (member) {
+             return Object.assign({}, member, {
+               id: resolver.entity(member.id).copy(resolver, copies).id
+             });
+           });
+           copy = copy.update({
+             members: members
+           });
+           copies[this.id] = copy;
+           return copy;
+         },
+         extent: function extent(resolver, memo) {
+           return resolver["transient"](this, 'extent', function () {
+             if (memo && memo[this.id]) return geoExtent();
+             memo = memo || {};
+             memo[this.id] = true;
+             var extent = geoExtent();
 
-           if (isInvoking) {
-             if (timerId === undefined) {
-               return leadingEdge(lastCallTime);
+             for (var i = 0; i < this.members.length; i++) {
+               var member = resolver.hasEntity(this.members[i].id);
+
+               if (member) {
+                 extent._extend(member.extent(resolver, memo));
+               }
              }
-             if (maxing) {
-               // Handle invocations in a tight loop.
-               clearTimeout(timerId);
-               timerId = setTimeout(timerExpired, wait);
-               return invokeFunc(lastCallTime);
+
+             return extent;
+           });
+         },
+         geometry: function geometry(graph) {
+           return graph["transient"](this, 'geometry', function () {
+             return this.isMultipolygon() ? 'area' : 'relation';
+           });
+         },
+         isDegenerate: function isDegenerate() {
+           return this.members.length === 0;
+         },
+         // Return an array of members, each extended with an 'index' property whose value
+         // is the member index.
+         indexedMembers: function indexedMembers() {
+           var result = new Array(this.members.length);
+
+           for (var i = 0; i < this.members.length; i++) {
+             result[i] = Object.assign({}, this.members[i], {
+               index: i
+             });
+           }
+
+           return result;
+         },
+         // Return the first member with the given role. A copy of the member object
+         // is returned, extended with an 'index' property whose value is the member index.
+         memberByRole: function memberByRole(role) {
+           for (var i = 0; i < this.members.length; i++) {
+             if (this.members[i].role === role) {
+               return Object.assign({}, this.members[i], {
+                 index: i
+               });
              }
            }
-           if (timerId === undefined) {
-             timerId = setTimeout(timerExpired, wait);
+         },
+         // Same as memberByRole, but returns all members with the given role
+         membersByRole: function membersByRole(role) {
+           var result = [];
+
+           for (var i = 0; i < this.members.length; i++) {
+             if (this.members[i].role === role) {
+               result.push(Object.assign({}, this.members[i], {
+                 index: i
+               }));
+             }
            }
+
            return result;
-         }
-         debounced.cancel = cancel;
-         debounced.flush = flush;
-         return debounced;
-       }
+         },
+         // Return the first member with the given id. A copy of the member object
+         // is returned, extended with an 'index' property whose value is the member index.
+         memberById: function memberById(id) {
+           for (var i = 0; i < this.members.length; i++) {
+             if (this.members[i].id === id) {
+               return Object.assign({}, this.members[i], {
+                 index: i
+               });
+             }
+           }
+         },
+         // Return the first member with the given id and role. A copy of the member object
+         // is returned, extended with an 'index' property whose value is the member index.
+         memberByIdAndRole: function memberByIdAndRole(id, role) {
+           for (var i = 0; i < this.members.length; i++) {
+             if (this.members[i].id === id && this.members[i].role === role) {
+               return Object.assign({}, this.members[i], {
+                 index: i
+               });
+             }
+           }
+         },
+         addMember: function addMember(member, index) {
+           var members = this.members.slice();
+           members.splice(index === undefined ? members.length : index, 0, member);
+           return this.update({
+             members: members
+           });
+         },
+         updateMember: function updateMember(member, index) {
+           var members = this.members.slice();
+           members.splice(index, 1, Object.assign({}, members[index], member));
+           return this.update({
+             members: members
+           });
+         },
+         removeMember: function removeMember(index) {
+           var members = this.members.slice();
+           members.splice(index, 1);
+           return this.update({
+             members: members
+           });
+         },
+         removeMembersWithID: function removeMembersWithID(id) {
+           var members = this.members.filter(function (m) {
+             return m.id !== id;
+           });
+           return this.update({
+             members: members
+           });
+         },
+         moveMember: function moveMember(fromIndex, toIndex) {
+           var members = this.members.slice();
+           members.splice(toIndex, 0, members.splice(fromIndex, 1)[0]);
+           return this.update({
+             members: members
+           });
+         },
+         // Wherever a member appears with id `needle.id`, replace it with a member
+         // with id `replacement.id`, type `replacement.type`, and the original role,
+         // By default, adding a duplicate member (by id and role) is prevented.
+         // Return an updated relation.
+         replaceMember: function replaceMember(needle, replacement, keepDuplicates) {
+           if (!this.memberById(needle.id)) return this;
+           var members = [];
+
+           for (var i = 0; i < this.members.length; i++) {
+             var member = this.members[i];
+
+             if (member.id !== needle.id) {
+               members.push(member);
+             } else if (keepDuplicates || !this.memberByIdAndRole(replacement.id, member.role)) {
+               members.push({
+                 id: replacement.id,
+                 type: replacement.type,
+                 role: member.role
+               });
+             }
+           }
 
-       /** Error message constants. */
-       var FUNC_ERROR_TEXT$1 = 'Expected a function';
+           return this.update({
+             members: members
+           });
+         },
+         asJXON: function asJXON(changeset_id) {
+           var r = {
+             relation: {
+               '@id': this.osmId(),
+               '@version': this.version || 0,
+               member: this.members.map(function (member) {
+                 return {
+                   keyAttributes: {
+                     type: member.type,
+                     role: member.role,
+                     ref: osmEntity.id.toOSM(member.id)
+                   }
+                 };
+               }, this),
+               tag: Object.keys(this.tags).map(function (k) {
+                 return {
+                   keyAttributes: {
+                     k: k,
+                     v: this.tags[k]
+                   }
+                 };
+               }, this)
+             }
+           };
 
-       /**
-        * Creates a throttled function that only invokes `func` at most once per
-        * every `wait` milliseconds. The throttled function comes with a `cancel`
-        * method to cancel delayed `func` invocations and a `flush` method to
-        * immediately invoke them. Provide `options` to indicate whether `func`
-        * should be invoked on the leading and/or trailing edge of the `wait`
-        * timeout. The `func` is invoked with the last arguments provided to the
-        * throttled function. Subsequent calls to the throttled function return the
-        * result of the last `func` invocation.
-        *
-        * **Note:** If `leading` and `trailing` options are `true`, `func` is
-        * invoked on the trailing edge of the timeout only if the throttled function
-        * is invoked more than once during the `wait` timeout.
-        *
-        * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
-        * until to the next tick, similar to `setTimeout` with a timeout of `0`.
-        *
-        * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
-        * for details over the differences between `_.throttle` and `_.debounce`.
-        *
-        * @static
-        * @memberOf _
-        * @since 0.1.0
-        * @category Function
-        * @param {Function} func The function to throttle.
-        * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
-        * @param {Object} [options={}] The options object.
-        * @param {boolean} [options.leading=true]
-        *  Specify invoking on the leading edge of the timeout.
-        * @param {boolean} [options.trailing=true]
-        *  Specify invoking on the trailing edge of the timeout.
-        * @returns {Function} Returns the new throttled function.
-        * @example
-        *
-        * // Avoid excessively updating the position while scrolling.
-        * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
-        *
-        * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.
-        * var throttled = _.throttle(renewToken, 300000, { 'trailing': false });
-        * jQuery(element).on('click', throttled);
-        *
-        * // Cancel the trailing throttled invocation.
-        * jQuery(window).on('popstate', throttled.cancel);
-        */
-       function throttle(func, wait, options) {
-         var leading = true,
-             trailing = true;
+           if (changeset_id) {
+             r.relation['@changeset'] = changeset_id;
+           }
 
-         if (typeof func != 'function') {
-           throw new TypeError(FUNC_ERROR_TEXT$1);
-         }
-         if (isObject$1(options)) {
-           leading = 'leading' in options ? !!options.leading : leading;
-           trailing = 'trailing' in options ? !!options.trailing : trailing;
-         }
-         return debounce(func, wait, {
-           'leading': leading,
-           'maxWait': wait,
-           'trailing': trailing
-         });
-       }
+           return r;
+         },
+         asGeoJSON: function asGeoJSON(resolver) {
+           return resolver["transient"](this, 'GeoJSON', function () {
+             if (this.isMultipolygon()) {
+               return {
+                 type: 'MultiPolygon',
+                 coordinates: this.multipolygon(resolver)
+               };
+             } else {
+               return {
+                 type: 'FeatureCollection',
+                 properties: this.tags,
+                 features: this.members.map(function (member) {
+                   return Object.assign({
+                     role: member.role
+                   }, resolver.entity(member.id).asGeoJSON(resolver));
+                 })
+               };
+             }
+           });
+         },
+         area: function area(resolver) {
+           return resolver["transient"](this, 'area', function () {
+             return d3_geoArea(this.asGeoJSON(resolver));
+           });
+         },
+         isMultipolygon: function isMultipolygon() {
+           return this.tags.type === 'multipolygon';
+         },
+         isComplete: function isComplete(resolver) {
+           for (var i = 0; i < this.members.length; i++) {
+             if (!resolver.hasEntity(this.members[i].id)) {
+               return false;
+             }
+           }
 
-       var hashes = createCommonjsModule(function (module, exports) {
-       /**
-        * jshashes - https://github.com/h2non/jshashes
-        * Released under the "New BSD" license
-        *
-        * Algorithms specification:
-        *
-        * MD5 - http://www.ietf.org/rfc/rfc1321.txt
-        * RIPEMD-160 - http://homes.esat.kuleuven.be/~bosselae/ripemd160.html
-        * SHA1   - http://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf
-        * SHA256 - http://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf
-        * SHA512 - http://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf
-        * HMAC - http://www.ietf.org/rfc/rfc2104.txt
-        */
-       (function() {
-         var Hashes;
+           return true;
+         },
+         hasFromViaTo: function hasFromViaTo() {
+           return this.members.some(function (m) {
+             return m.role === 'from';
+           }) && this.members.some(function (m) {
+             return m.role === 'via';
+           }) && this.members.some(function (m) {
+             return m.role === 'to';
+           });
+         },
+         isRestriction: function isRestriction() {
+           return !!(this.tags.type && this.tags.type.match(/^restriction:?/));
+         },
+         isValidRestriction: function isValidRestriction() {
+           if (!this.isRestriction()) return false;
+           var froms = this.members.filter(function (m) {
+             return m.role === 'from';
+           });
+           var vias = this.members.filter(function (m) {
+             return m.role === 'via';
+           });
+           var tos = this.members.filter(function (m) {
+             return m.role === 'to';
+           });
+           if (froms.length !== 1 && this.tags.restriction !== 'no_entry') return false;
+           if (froms.some(function (m) {
+             return m.type !== 'way';
+           })) return false;
+           if (tos.length !== 1 && this.tags.restriction !== 'no_exit') return false;
+           if (tos.some(function (m) {
+             return m.type !== 'way';
+           })) return false;
+           if (vias.length === 0) return false;
+           if (vias.length > 1 && vias.some(function (m) {
+             return m.type !== 'way';
+           })) return false;
+           return true;
+         },
+         // Returns an array [A0, ... An], each Ai being an array of node arrays [Nds0, ... Ndsm],
+         // where Nds0 is an outer ring and subsequent Ndsi's (if any i > 0) being inner rings.
+         //
+         // This corresponds to the structure needed for rendering a multipolygon path using a
+         // `evenodd` fill rule, as well as the structure of a GeoJSON MultiPolygon geometry.
+         //
+         // In the case of invalid geometries, this function will still return a result which
+         // includes the nodes of all way members, but some Nds may be unclosed and some inner
+         // rings not matched with the intended outer ring.
+         //
+         multipolygon: function multipolygon(resolver) {
+           var outers = this.members.filter(function (m) {
+             return 'outer' === (m.role || 'outer');
+           });
+           var inners = this.members.filter(function (m) {
+             return 'inner' === m.role;
+           });
+           outers = osmJoinWays(outers, resolver);
+           inners = osmJoinWays(inners, resolver);
 
-         function utf8Encode(str) {
-           var x, y, output = '',
-             i = -1,
-             l;
-
-           if (str && str.length) {
-             l = str.length;
-             while ((i += 1) < l) {
-               /* Decode utf-16 surrogate pairs */
-               x = str.charCodeAt(i);
-               y = i + 1 < l ? str.charCodeAt(i + 1) : 0;
-               if (0xD800 <= x && x <= 0xDBFF && 0xDC00 <= y && y <= 0xDFFF) {
-                 x = 0x10000 + ((x & 0x03FF) << 10) + (y & 0x03FF);
-                 i += 1;
-               }
-               /* Encode output as utf-8 */
-               if (x <= 0x7F) {
-                 output += String.fromCharCode(x);
-               } else if (x <= 0x7FF) {
-                 output += String.fromCharCode(0xC0 | ((x >>> 6) & 0x1F),
-                   0x80 | (x & 0x3F));
-               } else if (x <= 0xFFFF) {
-                 output += String.fromCharCode(0xE0 | ((x >>> 12) & 0x0F),
-                   0x80 | ((x >>> 6) & 0x3F),
-                   0x80 | (x & 0x3F));
-               } else if (x <= 0x1FFFFF) {
-                 output += String.fromCharCode(0xF0 | ((x >>> 18) & 0x07),
-                   0x80 | ((x >>> 12) & 0x3F),
-                   0x80 | ((x >>> 6) & 0x3F),
-                   0x80 | (x & 0x3F));
-               }
+           var sequenceToLineString = function sequenceToLineString(sequence) {
+             if (sequence.nodes.length > 2 && sequence.nodes[0] !== sequence.nodes[sequence.nodes.length - 1]) {
+               // close unclosed parts to ensure correct area rendering - #2945
+               sequence.nodes.push(sequence.nodes[0]);
              }
-           }
-           return output;
-         }
 
-         function utf8Decode(str) {
-           var i, ac, c1, c2, c3, arr = [],
-             l;
-           i = ac = c1 = c2 = c3 = 0;
-
-           if (str && str.length) {
-             l = str.length;
-             str += '';
-
-             while (i < l) {
-               c1 = str.charCodeAt(i);
-               ac += 1;
-               if (c1 < 128) {
-                 arr[ac] = String.fromCharCode(c1);
-                 i += 1;
-               } else if (c1 > 191 && c1 < 224) {
-                 c2 = str.charCodeAt(i + 1);
-                 arr[ac] = String.fromCharCode(((c1 & 31) << 6) | (c2 & 63));
-                 i += 2;
-               } else {
-                 c2 = str.charCodeAt(i + 1);
-                 c3 = str.charCodeAt(i + 2);
-                 arr[ac] = String.fromCharCode(((c1 & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
-                 i += 3;
-               }
+             return sequence.nodes.map(function (node) {
+               return node.loc;
+             });
+           };
+
+           outers = outers.map(sequenceToLineString);
+           inners = inners.map(sequenceToLineString);
+           var result = outers.map(function (o) {
+             // Heuristic for detecting counterclockwise winding order. Assumes
+             // that OpenStreetMap polygons are not hemisphere-spanning.
+             return [d3_geoArea({
+               type: 'Polygon',
+               coordinates: [o]
+             }) > 2 * Math.PI ? o.reverse() : o];
+           });
+
+           function findOuter(inner) {
+             var o, outer;
+
+             for (o = 0; o < outers.length; o++) {
+               outer = outers[o];
+               if (geoPolygonContainsPolygon(outer, inner)) return o;
+             }
+
+             for (o = 0; o < outers.length; o++) {
+               outer = outers[o];
+               if (geoPolygonIntersectsPolygon(outer, inner, false)) return o;
              }
            }
-           return arr.join('');
-         }
 
-         /**
-          * Add integers, wrapping at 2^32. This uses 16-bit operations internally
-          * to work around bugs in some JS interpreters.
-          */
+           for (var i = 0; i < inners.length; i++) {
+             var inner = inners[i];
 
-         function safe_add(x, y) {
-           var lsw = (x & 0xFFFF) + (y & 0xFFFF),
-             msw = (x >> 16) + (y >> 16) + (lsw >> 16);
-           return (msw << 16) | (lsw & 0xFFFF);
-         }
+             if (d3_geoArea({
+               type: 'Polygon',
+               coordinates: [inner]
+             }) < 2 * Math.PI) {
+               inner = inner.reverse();
+             }
 
-         /**
-          * Bitwise rotate a 32-bit number to the left.
-          */
+             var o = findOuter(inners[i]);
+
+             if (o !== undefined) {
+               result[o].push(inners[i]);
+             } else {
+               result.push([inners[i]]); // Invalid geometry
+             }
+           }
 
-         function bit_rol(num, cnt) {
-           return (num << cnt) | (num >>> (32 - cnt));
+           return result;
          }
+       });
 
-         /**
-          * Convert a raw string to a hex string
-          */
+       var QAItem = /*#__PURE__*/function () {
+         function QAItem(loc, service, itemType, id, props) {
+           _classCallCheck(this, QAItem);
 
-         function rstr2hex(input, hexcase) {
-           var hex_tab = hexcase ? '0123456789ABCDEF' : '0123456789abcdef',
-             output = '',
-             x, i = 0,
-             l = input.length;
-           for (; i < l; i += 1) {
-             x = input.charCodeAt(i);
-             output += hex_tab.charAt((x >>> 4) & 0x0F) + hex_tab.charAt(x & 0x0F);
-           }
-           return output;
-         }
+           // Store required properties
+           this.loc = loc;
+           this.service = service.title;
+           this.itemType = itemType; // All issues must have an ID for selection, use generic if none specified
 
-         /**
-          * Convert an array of big-endian words to a string
-          */
+           this.id = id ? id : "".concat(QAItem.id());
+           this.update(props); // Some QA services have marker icons to differentiate issues
 
-         function binb2rstr(input) {
-           var i, l = input.length * 32,
-             output = '';
-           for (i = 0; i < l; i += 8) {
-             output += String.fromCharCode((input[i >> 5] >>> (24 - i % 32)) & 0xFF);
+           if (service && typeof service.getIcon === 'function') {
+             this.icon = service.getIcon(itemType);
            }
-           return output;
          }
 
-         /**
-          * Convert an array of little-endian words to a string
-          */
+         _createClass(QAItem, [{
+           key: "update",
+           value: function update(props) {
+             var _this = this;
 
-         function binl2rstr(input) {
-           var i, l = input.length * 32,
-             output = '';
-           for (i = 0; i < l; i += 8) {
-             output += String.fromCharCode((input[i >> 5] >>> (i % 32)) & 0xFF);
+             // You can't override this initial information
+             var loc = this.loc,
+                 service = this.service,
+                 itemType = this.itemType,
+                 id = this.id;
+             Object.keys(props).forEach(function (prop) {
+               return _this[prop] = props[prop];
+             });
+             this.loc = loc;
+             this.service = service;
+             this.itemType = itemType;
+             this.id = id;
+             return this;
+           } // Generic handling for newly created QAItems
+
+         }], [{
+           key: "id",
+           value: function id() {
+             return this.nextId--;
            }
-           return output;
-         }
+         }]);
 
-         /**
-          * Convert a raw string to an array of little-endian words
-          * Characters >255 have their high-byte silently ignored.
-          */
+         return QAItem;
+       }();
+       QAItem.nextId = -1;
 
-         function rstr2binl(input) {
-           var i, l = input.length * 8,
-             output = Array(input.length >> 2),
-             lo = output.length;
-           for (i = 0; i < lo; i += 1) {
-             output[i] = 0;
-           }
-           for (i = 0; i < l; i += 8) {
-             output[i >> 5] |= (input.charCodeAt(i / 8) & 0xFF) << (i % 32);
-           }
-           return output;
-         }
+       //
+       // Optionally, split only the given ways, if multiple ways share
+       // the given node.
+       //
+       // This is the inverse of `iD.actionJoin`.
+       //
+       // For testing convenience, accepts an ID to assign to the new way.
+       // Normally, this will be undefined and the way will automatically
+       // be assigned a new ID.
+       //
+       // Reference:
+       //   https://github.com/systemed/potlatch2/blob/master/net/systemeD/halcyon/connection/actions/SplitWayAction.as
+       //
 
-         /**
-          * Convert a raw string to an array of big-endian words
-          * Characters >255 have their high-byte silently ignored.
-          */
+       function actionSplit(nodeIds, newWayIds) {
+         // accept single ID for backwards-compatiblity
+         if (typeof nodeIds === 'string') nodeIds = [nodeIds];
 
-         function rstr2binb(input) {
-           var i, l = input.length * 8,
-             output = Array(input.length >> 2),
-             lo = output.length;
-           for (i = 0; i < lo; i += 1) {
-             output[i] = 0;
-           }
-           for (i = 0; i < l; i += 8) {
-             output[i >> 5] |= (input.charCodeAt(i / 8) & 0xFF) << (24 - i % 32);
-           }
-           return output;
-         }
+         var _wayIDs; // the strategy for picking which way will have a new version and which way is newly created
 
-         /**
-          * Convert a raw string to an arbitrary string encoding
-          */
 
-         function rstr2any(input, encoding) {
-           var divisor = encoding.length,
-             remainders = Array(),
-             i, q, x, ld, quotient, dividend, output, full_length;
+         var _keepHistoryOn = 'longest'; // 'longest', 'first'
+         // The IDs of the ways actually created by running this action
 
-           /* Convert to an array of 16-bit big-endian values, forming the dividend */
-           dividend = Array(Math.ceil(input.length / 2));
-           ld = dividend.length;
-           for (i = 0; i < ld; i += 1) {
-             dividend[i] = (input.charCodeAt(i * 2) << 8) | input.charCodeAt(i * 2 + 1);
-           }
+         var _createdWayIDs = [];
 
-           /**
-            * Repeatedly perform a long division. The binary array forms the dividend,
-            * the length of the encoding is the divisor. Once computed, the quotient
-            * forms the dividend for the next step. We stop when the dividend is zerHashes.
-            * All remainders are stored for later use.
-            */
-           while (dividend.length > 0) {
-             quotient = Array();
-             x = 0;
-             for (i = 0; i < dividend.length; i += 1) {
-               x = (x << 16) + dividend[i];
-               q = Math.floor(x / divisor);
-               x -= q * divisor;
-               if (quotient.length > 0 || q > 0) {
-                 quotient[quotient.length] = q;
-               }
-             }
-             remainders[remainders.length] = x;
-             dividend = quotient;
-           }
+         function dist(graph, nA, nB) {
+           var locA = graph.entity(nA).loc;
+           var locB = graph.entity(nB).loc;
+           var epsilon = 1e-6;
+           return locA && locB ? geoSphericalDistance(locA, locB) : epsilon;
+         } // If the way is closed, we need to search for a partner node
+         // to split the way at.
+         //
+         // The following looks for a node that is both far away from
+         // the initial node in terms of way segment length and nearby
+         // in terms of beeline-distance. This assures that areas get
+         // split on the most "natural" points (independent of the number
+         // of nodes).
+         // For example: bone-shaped areas get split across their waist
+         // line, circles across the diameter.
+
+
+         function splitArea(nodes, idxA, graph) {
+           var lengths = new Array(nodes.length);
+           var length;
+           var i;
+           var best = 0;
+           var idxB;
 
-           /* Convert the remainders to the output string */
-           output = '';
-           for (i = remainders.length - 1; i >= 0; i--) {
-             output += encoding.charAt(remainders[i]);
-           }
+           function wrap(index) {
+             return utilWrap(index, nodes.length);
+           } // calculate lengths
 
-           /* Append leading zero equivalents */
-           full_length = Math.ceil(input.length * 8 / (Math.log(encoding.length) / Math.log(2)));
-           for (i = output.length; i < full_length; i += 1) {
-             output = encoding[0] + output;
-           }
-           return output;
-         }
 
-         /**
-          * Convert a raw string to a base-64 string
-          */
+           length = 0;
 
-         function rstr2b64(input, b64pad) {
-           var tab = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
-             output = '',
-             len = input.length,
-             i, j, triplet;
-           b64pad = b64pad || '=';
-           for (i = 0; i < len; i += 3) {
-             triplet = (input.charCodeAt(i) << 16) | (i + 1 < len ? input.charCodeAt(i + 1) << 8 : 0) | (i + 2 < len ? input.charCodeAt(i + 2) : 0);
-             for (j = 0; j < 4; j += 1) {
-               if (i * 8 + j * 6 > input.length * 8) {
-                 output += b64pad;
-               } else {
-                 output += tab.charAt((triplet >>> 6 * (3 - j)) & 0x3F);
-               }
-             }
+           for (i = wrap(idxA + 1); i !== idxA; i = wrap(i + 1)) {
+             length += dist(graph, nodes[i], nodes[wrap(i - 1)]);
+             lengths[i] = length;
            }
-           return output;
-         }
-
-         Hashes = {
-           /**
-            * @property {String} version
-            * @readonly
-            */
-           VERSION: '1.0.6',
-           /**
-            * @member Hashes
-            * @class Base64
-            * @constructor
-            */
-           Base64: function() {
-             // private properties
-             var tab = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
-               pad = '=', // default pad according with the RFC standard
-               utf8 = true; // by default enable UTF-8 support encoding
 
-             // public method for encoding
-             this.encode = function(input) {
-               var i, j, triplet,
-                 output = '',
-                 len = input.length;
+           length = 0;
 
-               pad = pad || '=';
-               input = (utf8) ? utf8Encode(input) : input;
+           for (i = wrap(idxA - 1); i !== idxA; i = wrap(i - 1)) {
+             length += dist(graph, nodes[i], nodes[wrap(i + 1)]);
 
-               for (i = 0; i < len; i += 3) {
-                 triplet = (input.charCodeAt(i) << 16) | (i + 1 < len ? input.charCodeAt(i + 1) << 8 : 0) | (i + 2 < len ? input.charCodeAt(i + 2) : 0);
-                 for (j = 0; j < 4; j += 1) {
-                   if (i * 8 + j * 6 > len * 8) {
-                     output += pad;
-                   } else {
-                     output += tab.charAt((triplet >>> 6 * (3 - j)) & 0x3F);
-                   }
-                 }
-               }
-               return output;
-             };
+             if (length < lengths[i]) {
+               lengths[i] = length;
+             }
+           } // determine best opposite node to split
 
-             // public method for decoding
-             this.decode = function(input) {
-               // var b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
-               var i, o1, o2, o3, h1, h2, h3, h4, bits, ac,
-                 dec = '',
-                 arr = [];
-               if (!input) {
-                 return input;
-               }
 
-               i = ac = 0;
-               input = input.replace(new RegExp('\\' + pad, 'gi'), ''); // use '='
-               //input += '';
+           for (i = 0; i < nodes.length; i++) {
+             var cost = lengths[i] / dist(graph, nodes[idxA], nodes[i]);
 
-               do { // unpack four hexets into three octets using index points in b64
-                 h1 = tab.indexOf(input.charAt(i += 1));
-                 h2 = tab.indexOf(input.charAt(i += 1));
-                 h3 = tab.indexOf(input.charAt(i += 1));
-                 h4 = tab.indexOf(input.charAt(i += 1));
+             if (cost > best) {
+               idxB = i;
+               best = cost;
+             }
+           }
 
-                 bits = h1 << 18 | h2 << 12 | h3 << 6 | h4;
+           return idxB;
+         }
 
-                 o1 = bits >> 16 & 0xff;
-                 o2 = bits >> 8 & 0xff;
-                 o3 = bits & 0xff;
-                 ac += 1;
+         function totalLengthBetweenNodes(graph, nodes) {
+           var totalLength = 0;
 
-                 if (h3 === 64) {
-                   arr[ac] = String.fromCharCode(o1);
-                 } else if (h4 === 64) {
-                   arr[ac] = String.fromCharCode(o1, o2);
-                 } else {
-                   arr[ac] = String.fromCharCode(o1, o2, o3);
-                 }
-               } while (i < input.length);
+           for (var i = 0; i < nodes.length - 1; i++) {
+             totalLength += dist(graph, nodes[i], nodes[i + 1]);
+           }
 
-               dec = arr.join('');
-               dec = (utf8) ? utf8Decode(dec) : dec;
+           return totalLength;
+         }
 
-               return dec;
-             };
+         function split(graph, nodeId, wayA, newWayId) {
+           var wayB = osmWay({
+             id: newWayId,
+             tags: wayA.tags
+           }); // `wayB` is the NEW way
 
-             // set custom pad string
-             this.setPad = function(str) {
-               pad = str || pad;
-               return this;
-             };
-             // set custom tab string characters
-             this.setTab = function(str) {
-               tab = str || tab;
-               return this;
-             };
-             this.setUTF8 = function(bool) {
-               if (typeof bool === 'boolean') {
-                 utf8 = bool;
-               }
-               return this;
-             };
-           },
+           var origNodes = wayA.nodes.slice();
+           var nodesA;
+           var nodesB;
+           var isArea = wayA.isArea();
+           var isOuter = osmIsOldMultipolygonOuterMember(wayA, graph);
 
-           /**
-            * CRC-32 calculation
-            * @member Hashes
-            * @method CRC32
-            * @static
-            * @param {String} str Input String
-            * @return {String}
-            */
-           CRC32: function(str) {
-             var crc = 0,
-               x = 0,
-               y = 0,
-               table, i, iTop;
-             str = utf8Encode(str);
-
-             table = [
-               '00000000 77073096 EE0E612C 990951BA 076DC419 706AF48F E963A535 9E6495A3 0EDB8832 ',
-               '79DCB8A4 E0D5E91E 97D2D988 09B64C2B 7EB17CBD E7B82D07 90BF1D91 1DB71064 6AB020F2 F3B97148 ',
-               '84BE41DE 1ADAD47D 6DDDE4EB F4D4B551 83D385C7 136C9856 646BA8C0 FD62F97A 8A65C9EC 14015C4F ',
-               '63066CD9 FA0F3D63 8D080DF5 3B6E20C8 4C69105E D56041E4 A2677172 3C03E4D1 4B04D447 D20D85FD ',
-               'A50AB56B 35B5A8FA 42B2986C DBBBC9D6 ACBCF940 32D86CE3 45DF5C75 DCD60DCF ABD13D59 26D930AC ',
-               '51DE003A C8D75180 BFD06116 21B4F4B5 56B3C423 CFBA9599 B8BDA50F 2802B89E 5F058808 C60CD9B2 ',
-               'B10BE924 2F6F7C87 58684C11 C1611DAB B6662D3D 76DC4190 01DB7106 98D220BC EFD5102A 71B18589 ',
-               '06B6B51F 9FBFE4A5 E8B8D433 7807C9A2 0F00F934 9609A88E E10E9818 7F6A0DBB 086D3D2D 91646C97 ',
-               'E6635C01 6B6B51F4 1C6C6162 856530D8 F262004E 6C0695ED 1B01A57B 8208F4C1 F50FC457 65B0D9C6 ',
-               '12B7E950 8BBEB8EA FCB9887C 62DD1DDF 15DA2D49 8CD37CF3 FBD44C65 4DB26158 3AB551CE A3BC0074 ',
-               'D4BB30E2 4ADFA541 3DD895D7 A4D1C46D D3D6F4FB 4369E96A 346ED9FC AD678846 DA60B8D0 44042D73 ',
-               '33031DE5 AA0A4C5F DD0D7CC9 5005713C 270241AA BE0B1010 C90C2086 5768B525 206F85B3 B966D409 ',
-               'CE61E49F 5EDEF90E 29D9C998 B0D09822 C7D7A8B4 59B33D17 2EB40D81 B7BD5C3B C0BA6CAD EDB88320 ',
-               '9ABFB3B6 03B6E20C 74B1D29A EAD54739 9DD277AF 04DB2615 73DC1683 E3630B12 94643B84 0D6D6A3E ',
-               '7A6A5AA8 E40ECF0B 9309FF9D 0A00AE27 7D079EB1 F00F9344 8708A3D2 1E01F268 6906C2FE F762575D ',
-               '806567CB 196C3671 6E6B06E7 FED41B76 89D32BE0 10DA7A5A 67DD4ACC F9B9DF6F 8EBEEFF9 17B7BE43 ',
-               '60B08ED5 D6D6A3E8 A1D1937E 38D8C2C4 4FDFF252 D1BB67F1 A6BC5767 3FB506DD 48B2364B D80D2BDA ',
-               'AF0A1B4C 36034AF6 41047A60 DF60EFC3 A867DF55 316E8EEF 4669BE79 CB61B38C BC66831A 256FD2A0 ',
-               '5268E236 CC0C7795 BB0B4703 220216B9 5505262F C5BA3BBE B2BD0B28 2BB45A92 5CB36A04 C2D7FFA7 ',
-               'B5D0CF31 2CD99E8B 5BDEAE1D 9B64C2B0 EC63F226 756AA39C 026D930A 9C0906A9 EB0E363F 72076785 ',
-               '05005713 95BF4A82 E2B87A14 7BB12BAE 0CB61B38 92D28E9B E5D5BE0D 7CDCEFB7 0BDBDF21 86D3D2D4 ',
-               'F1D4E242 68DDB3F8 1FDA836E 81BE16CD F6B9265B 6FB077E1 18B74777 88085AE6 FF0F6A70 66063BCA ',
-               '11010B5C 8F659EFF F862AE69 616BFFD3 166CCF45 A00AE278 D70DD2EE 4E048354 3903B3C2 A7672661 ',
-               'D06016F7 4969474D 3E6E77DB AED16A4A D9D65ADC 40DF0B66 37D83BF0 A9BCAE53 DEBB9EC5 47B2CF7F ',
-               '30B5FFE9 BDBDF21C CABAC28A 53B39330 24B4A3A6 BAD03605 CDD70693 54DE5729 23D967BF B3667A2E ',
-               'C4614AB8 5D681B02 2A6F2B94 B40BBE37 C30C8EA1 5A05DF1B 2D02EF8D'
-             ].join('');
-
-             crc = crc ^ (-1);
-             for (i = 0, iTop = str.length; i < iTop; i += 1) {
-               y = (crc ^ str.charCodeAt(i)) & 0xFF;
-               x = '0x' + table.substr(y * 9, 8);
-               crc = (crc >>> 8) ^ x;
-             }
-             // always return a positive number (that's what >>> 0 does)
-             return (crc ^ (-1)) >>> 0;
-           },
-           /**
-            * @member Hashes
-            * @class MD5
-            * @constructor
-            * @param {Object} [config]
-            *
-            * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
-            * Digest Algorithm, as defined in RFC 1321.
-            * Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
-            * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
-            * See <http://pajhome.org.uk/crypt/md5> for more infHashes.
-            */
-           MD5: function(options) {
-             /**
-              * Private config properties. You may need to tweak these to be compatible with
-              * the server-side, but the defaults work in most cases.
-              * See {@link Hashes.MD5#method-setUpperCase} and {@link Hashes.SHA1#method-setUpperCase}
-              */
-             var hexcase = (options && typeof options.uppercase === 'boolean') ? options.uppercase : false, // hexadecimal output case format. false - lowercase; true - uppercase
-               b64pad = (options && typeof options.pad === 'string') ? options.pad : '=', // base-64 pad character. Defaults to '=' for strict RFC compliance
-               utf8 = (options && typeof options.utf8 === 'boolean') ? options.utf8 : true; // enable/disable utf8 encoding
+           if (wayA.isClosed()) {
+             var nodes = wayA.nodes.slice(0, -1);
+             var idxA = nodes.indexOf(nodeId);
+             var idxB = splitArea(nodes, idxA, graph);
 
-             // privileged (public) methods
-             this.hex = function(s) {
-               return rstr2hex(rstr(s), hexcase);
-             };
-             this.b64 = function(s) {
-               return rstr2b64(rstr(s), b64pad);
-             };
-             this.any = function(s, e) {
-               return rstr2any(rstr(s), e);
-             };
-             this.raw = function(s) {
-               return rstr(s);
-             };
-             this.hex_hmac = function(k, d) {
-               return rstr2hex(rstr_hmac(k, d), hexcase);
-             };
-             this.b64_hmac = function(k, d) {
-               return rstr2b64(rstr_hmac(k, d), b64pad);
-             };
-             this.any_hmac = function(k, d, e) {
-               return rstr2any(rstr_hmac(k, d), e);
-             };
-             /**
-              * Perform a simple self-test to see if the VM is working
-              * @return {String} Hexadecimal hash sample
-              */
-             this.vm_test = function() {
-               return hex('abc').toLowerCase() === '900150983cd24fb0d6963f7d28e17f72';
-             };
-             /**
-              * Enable/disable uppercase hexadecimal returned string
-              * @param {Boolean}
-              * @return {Object} this
-              */
-             this.setUpperCase = function(a) {
-               if (typeof a === 'boolean') {
-                 hexcase = a;
-               }
-               return this;
-             };
-             /**
-              * Defines a base64 pad string
-              * @param {String} Pad
-              * @return {Object} this
-              */
-             this.setPad = function(a) {
-               b64pad = a || b64pad;
-               return this;
-             };
-             /**
-              * Defines a base64 pad string
-              * @param {Boolean}
-              * @return {Object} [this]
-              */
-             this.setUTF8 = function(a) {
-               if (typeof a === 'boolean') {
-                 utf8 = a;
-               }
-               return this;
-             };
+             if (idxB < idxA) {
+               nodesA = nodes.slice(idxA).concat(nodes.slice(0, idxB + 1));
+               nodesB = nodes.slice(idxB, idxA + 1);
+             } else {
+               nodesA = nodes.slice(idxA, idxB + 1);
+               nodesB = nodes.slice(idxB).concat(nodes.slice(0, idxA + 1));
+             }
+           } else {
+             var idx = wayA.nodes.indexOf(nodeId, 1);
+             nodesA = wayA.nodes.slice(0, idx + 1);
+             nodesB = wayA.nodes.slice(idx);
+           }
 
-             // private methods
+           var lengthA = totalLengthBetweenNodes(graph, nodesA);
+           var lengthB = totalLengthBetweenNodes(graph, nodesB);
 
-             /**
-              * Calculate the MD5 of a raw string
-              */
+           if (_keepHistoryOn === 'longest' && lengthB > lengthA) {
+             // keep the history on the longer way, regardless of the node count
+             wayA = wayA.update({
+               nodes: nodesB
+             });
+             wayB = wayB.update({
+               nodes: nodesA
+             });
+             var temp = lengthA;
+             lengthA = lengthB;
+             lengthB = temp;
+           } else {
+             wayA = wayA.update({
+               nodes: nodesA
+             });
+             wayB = wayB.update({
+               nodes: nodesB
+             });
+           }
 
-             function rstr(s) {
-               s = (utf8) ? utf8Encode(s) : s;
-               return binl2rstr(binl(rstr2binl(s), s.length * 8));
+           if (wayA.tags.step_count) {
+             // divide up the the step count proportionally between the two ways
+             var stepCount = parseFloat(wayA.tags.step_count);
+
+             if (stepCount && // ensure a number
+             isFinite(stepCount) && // ensure positive
+             stepCount > 0 && // ensure integer
+             Math.round(stepCount) === stepCount) {
+               var tagsA = Object.assign({}, wayA.tags);
+               var tagsB = Object.assign({}, wayB.tags);
+               var ratioA = lengthA / (lengthA + lengthB);
+               var countA = Math.round(stepCount * ratioA);
+               tagsA.step_count = countA.toString();
+               tagsB.step_count = (stepCount - countA).toString();
+               wayA = wayA.update({
+                 tags: tagsA
+               });
+               wayB = wayB.update({
+                 tags: tagsB
+               });
              }
+           }
 
-             /**
-              * Calculate the HMAC-MD5, of a key and some data (raw strings)
-              */
+           graph = graph.replace(wayA);
+           graph = graph.replace(wayB);
+           graph.parentRelations(wayA).forEach(function (relation) {
+             var member; // Turn restrictions - make sure:
+             // 1. Splitting a FROM/TO way - only `wayA` OR `wayB` remains in relation
+             //    (whichever one is connected to the VIA node/ways)
+             // 2. Splitting a VIA way - `wayB` remains in relation as a VIA way
 
-             function rstr_hmac(key, data) {
-               var bkey, ipad, opad, hash, i;
+             if (relation.hasFromViaTo()) {
+               var f = relation.memberByRole('from');
+               var v = relation.membersByRole('via');
+               var t = relation.memberByRole('to');
+               var i; // 1. split a FROM/TO
 
-               key = (utf8) ? utf8Encode(key) : key;
-               data = (utf8) ? utf8Encode(data) : data;
-               bkey = rstr2binl(key);
-               if (bkey.length > 16) {
-                 bkey = binl(bkey, key.length * 8);
-               }
+               if (f.id === wayA.id || t.id === wayA.id) {
+                 var keepB = false;
 
-               ipad = Array(16), opad = Array(16);
-               for (i = 0; i < 16; i += 1) {
-                 ipad[i] = bkey[i] ^ 0x36363636;
-                 opad[i] = bkey[i] ^ 0x5C5C5C5C;
-               }
-               hash = binl(ipad.concat(rstr2binl(data)), 512 + data.length * 8);
-               return binl2rstr(binl(opad.concat(hash), 512 + 128));
-             }
+                 if (v.length === 1 && v[0].type === 'node') {
+                   // check via node
+                   keepB = wayB.contains(v[0].id);
+                 } else {
+                   // check via way(s)
+                   for (i = 0; i < v.length; i++) {
+                     if (v[i].type === 'way') {
+                       var wayVia = graph.hasEntity(v[i].id);
+
+                       if (wayVia && utilArrayIntersection(wayB.nodes, wayVia.nodes).length) {
+                         keepB = true;
+                         break;
+                       }
+                     }
+                   }
+                 }
 
-             /**
-              * Calculate the MD5 of an array of little-endian words, and a bit length.
-              */
+                 if (keepB) {
+                   relation = relation.replaceMember(wayA, wayB);
+                   graph = graph.replace(relation);
+                 } // 2. split a VIA
 
-             function binl(x, len) {
-               var i, olda, oldb, oldc, oldd,
-                 a = 1732584193,
-                 b = -271733879,
-                 c = -1732584194,
-                 d = 271733878;
-
-               /* append padding */
-               x[len >> 5] |= 0x80 << ((len) % 32);
-               x[(((len + 64) >>> 9) << 4) + 14] = len;
-
-               for (i = 0; i < x.length; i += 16) {
-                 olda = a;
-                 oldb = b;
-                 oldc = c;
-                 oldd = d;
-
-                 a = md5_ff(a, b, c, d, x[i + 0], 7, -680876936);
-                 d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586);
-                 c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819);
-                 b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330);
-                 a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897);
-                 d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426);
-                 c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341);
-                 b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983);
-                 a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416);
-                 d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417);
-                 c = md5_ff(c, d, a, b, x[i + 10], 17, -42063);
-                 b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162);
-                 a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682);
-                 d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101);
-                 c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290);
-                 b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329);
-
-                 a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510);
-                 d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632);
-                 c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713);
-                 b = md5_gg(b, c, d, a, x[i + 0], 20, -373897302);
-                 a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691);
-                 d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083);
-                 c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335);
-                 b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848);
-                 a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438);
-                 d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690);
-                 c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961);
-                 b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501);
-                 a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467);
-                 d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784);
-                 c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473);
-                 b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734);
-
-                 a = md5_hh(a, b, c, d, x[i + 5], 4, -378558);
-                 d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463);
-                 c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562);
-                 b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556);
-                 a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060);
-                 d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353);
-                 c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632);
-                 b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640);
-                 a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174);
-                 d = md5_hh(d, a, b, c, x[i + 0], 11, -358537222);
-                 c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979);
-                 b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189);
-                 a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487);
-                 d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835);
-                 c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520);
-                 b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651);
-
-                 a = md5_ii(a, b, c, d, x[i + 0], 6, -198630844);
-                 d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415);
-                 c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905);
-                 b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055);
-                 a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571);
-                 d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606);
-                 c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523);
-                 b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799);
-                 a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359);
-                 d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744);
-                 c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380);
-                 b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649);
-                 a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070);
-                 d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379);
-                 c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259);
-                 b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551);
-
-                 a = safe_add(a, olda);
-                 b = safe_add(b, oldb);
-                 c = safe_add(c, oldc);
-                 d = safe_add(d, oldd);
-               }
-               return Array(a, b, c, d);
-             }
+               } else {
+                 for (i = 0; i < v.length; i++) {
+                   if (v[i].type === 'way' && v[i].id === wayA.id) {
+                     member = {
+                       id: wayB.id,
+                       type: 'way',
+                       role: 'via'
+                     };
+                     graph = actionAddMember(relation.id, member, v[i].index + 1)(graph);
+                     break;
+                   }
+                 }
+               } // All other relations (Routes, Multipolygons, etc):
+               // 1. Both `wayA` and `wayB` remain in the relation
+               // 2. But must be inserted as a pair (see `actionAddMember` for details)
 
-             /**
-              * These functions implement the four basic operations the algorithm uses.
-              */
+             } else {
+               if (relation === isOuter) {
+                 graph = graph.replace(relation.mergeTags(wayA.tags));
+                 graph = graph.replace(wayA.update({
+                   tags: {}
+                 }));
+                 graph = graph.replace(wayB.update({
+                   tags: {}
+                 }));
+               }
 
-             function md5_cmn(q, a, b, x, s, t) {
-               return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);
+               member = {
+                 id: wayB.id,
+                 type: 'way',
+                 role: relation.memberById(wayA.id).role
+               };
+               var insertPair = {
+                 originalID: wayA.id,
+                 insertedID: wayB.id,
+                 nodes: origNodes
+               };
+               graph = actionAddMember(relation.id, member, undefined, insertPair)(graph);
              }
+           });
 
-             function md5_ff(a, b, c, d, x, s, t) {
-               return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
-             }
+           if (!isOuter && isArea) {
+             var multipolygon = osmRelation({
+               tags: Object.assign({}, wayA.tags, {
+                 type: 'multipolygon'
+               }),
+               members: [{
+                 id: wayA.id,
+                 role: 'outer',
+                 type: 'way'
+               }, {
+                 id: wayB.id,
+                 role: 'outer',
+                 type: 'way'
+               }]
+             });
+             graph = graph.replace(multipolygon);
+             graph = graph.replace(wayA.update({
+               tags: {}
+             }));
+             graph = graph.replace(wayB.update({
+               tags: {}
+             }));
+           }
 
-             function md5_gg(a, b, c, d, x, s, t) {
-               return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
-             }
+           _createdWayIDs.push(wayB.id);
 
-             function md5_hh(a, b, c, d, x, s, t) {
-               return md5_cmn(b ^ c ^ d, a, b, x, s, t);
-             }
+           return graph;
+         }
+
+         var action = function action(graph) {
+           _createdWayIDs = [];
+           var newWayIndex = 0;
+
+           for (var i = 0; i < nodeIds.length; i++) {
+             var nodeId = nodeIds[i];
+             var candidates = action.waysForNode(nodeId, graph);
 
-             function md5_ii(a, b, c, d, x, s, t) {
-               return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
+             for (var j = 0; j < candidates.length; j++) {
+               graph = split(graph, nodeId, candidates[j], newWayIds && newWayIds[newWayIndex]);
+               newWayIndex += 1;
              }
-           },
-           /**
-            * @member Hashes
-            * @class Hashes.SHA1
-            * @param {Object} [config]
-            * @constructor
-            *
-            * A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined in FIPS 180-1
-            * Version 2.2 Copyright Paul Johnston 2000 - 2009.
-            * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
-            * See http://pajhome.org.uk/crypt/md5 for details.
-            */
-           SHA1: function(options) {
-             /**
-              * Private config properties. You may need to tweak these to be compatible with
-              * the server-side, but the defaults work in most cases.
-              * See {@link Hashes.MD5#method-setUpperCase} and {@link Hashes.SHA1#method-setUpperCase}
-              */
-             var hexcase = (options && typeof options.uppercase === 'boolean') ? options.uppercase : false, // hexadecimal output case format. false - lowercase; true - uppercase
-               b64pad = (options && typeof options.pad === 'string') ? options.pad : '=', // base-64 pad character. Defaults to '=' for strict RFC compliance
-               utf8 = (options && typeof options.utf8 === 'boolean') ? options.utf8 : true; // enable/disable utf8 encoding
+           }
 
-             // public methods
-             this.hex = function(s) {
-               return rstr2hex(rstr(s), hexcase);
-             };
-             this.b64 = function(s) {
-               return rstr2b64(rstr(s), b64pad);
-             };
-             this.any = function(s, e) {
-               return rstr2any(rstr(s), e);
-             };
-             this.raw = function(s) {
-               return rstr(s);
-             };
-             this.hex_hmac = function(k, d) {
-               return rstr2hex(rstr_hmac(k, d));
-             };
-             this.b64_hmac = function(k, d) {
-               return rstr2b64(rstr_hmac(k, d), b64pad);
-             };
-             this.any_hmac = function(k, d, e) {
-               return rstr2any(rstr_hmac(k, d), e);
-             };
-             /**
-              * Perform a simple self-test to see if the VM is working
-              * @return {String} Hexadecimal hash sample
-              * @public
-              */
-             this.vm_test = function() {
-               return hex('abc').toLowerCase() === '900150983cd24fb0d6963f7d28e17f72';
-             };
-             /**
-              * @description Enable/disable uppercase hexadecimal returned string
-              * @param {boolean}
-              * @return {Object} this
-              * @public
-              */
-             this.setUpperCase = function(a) {
-               if (typeof a === 'boolean') {
-                 hexcase = a;
-               }
-               return this;
-             };
-             /**
-              * @description Defines a base64 pad string
-              * @param {string} Pad
-              * @return {Object} this
-              * @public
-              */
-             this.setPad = function(a) {
-               b64pad = a || b64pad;
-               return this;
-             };
-             /**
-              * @description Defines a base64 pad string
-              * @param {boolean}
-              * @return {Object} this
-              * @public
-              */
-             this.setUTF8 = function(a) {
-               if (typeof a === 'boolean') {
-                 utf8 = a;
-               }
-               return this;
-             };
+           return graph;
+         };
 
-             // private methods
+         action.getCreatedWayIDs = function () {
+           return _createdWayIDs;
+         };
 
-             /**
-              * Calculate the SHA-512 of a raw string
-              */
+         action.waysForNode = function (nodeId, graph) {
+           var node = graph.entity(nodeId);
+           var splittableParents = graph.parentWays(node).filter(isSplittable);
 
-             function rstr(s) {
-               s = (utf8) ? utf8Encode(s) : s;
-               return binb2rstr(binb(rstr2binb(s), s.length * 8));
+           if (!_wayIDs) {
+             // If the ways to split aren't specified, only split the lines.
+             // If there are no lines to split, split the areas.
+             var hasLine = splittableParents.some(function (parent) {
+               return parent.geometry(graph) === 'line';
+             });
+
+             if (hasLine) {
+               return splittableParents.filter(function (parent) {
+                 return parent.geometry(graph) === 'line';
+               });
              }
+           }
 
-             /**
-              * Calculate the HMAC-SHA1 of a key and some data (raw strings)
-              */
+           return splittableParents;
 
-             function rstr_hmac(key, data) {
-               var bkey, ipad, opad, i, hash;
-               key = (utf8) ? utf8Encode(key) : key;
-               data = (utf8) ? utf8Encode(data) : data;
-               bkey = rstr2binb(key);
+           function isSplittable(parent) {
+             // If the ways to split are specified, ignore everything else.
+             if (_wayIDs && _wayIDs.indexOf(parent.id) === -1) return false; // We can fake splitting closed ways at their endpoints...
 
-               if (bkey.length > 16) {
-                 bkey = binb(bkey, key.length * 8);
-               }
-               ipad = Array(16), opad = Array(16);
-               for (i = 0; i < 16; i += 1) {
-                 ipad[i] = bkey[i] ^ 0x36363636;
-                 opad[i] = bkey[i] ^ 0x5C5C5C5C;
-               }
-               hash = binb(ipad.concat(rstr2binb(data)), 512 + data.length * 8);
-               return binb2rstr(binb(opad.concat(hash), 512 + 160));
-             }
+             if (parent.isClosed()) return true; // otherwise, we can't split nodes at their endpoints.
 
-             /**
-              * Calculate the SHA-1 of an array of big-endian words, and a bit length
-              */
+             for (var i = 1; i < parent.nodes.length - 1; i++) {
+               if (parent.nodes[i] === nodeId) return true;
+             }
 
-             function binb(x, len) {
-               var i, j, t, olda, oldb, oldc, oldd, olde,
-                 w = Array(80),
-                 a = 1732584193,
-                 b = -271733879,
-                 c = -1732584194,
-                 d = 271733878,
-                 e = -1009589776;
-
-               /* append padding */
-               x[len >> 5] |= 0x80 << (24 - len % 32);
-               x[((len + 64 >> 9) << 4) + 15] = len;
-
-               for (i = 0; i < x.length; i += 16) {
-                 olda = a;
-                 oldb = b;
-                 oldc = c;
-                 oldd = d;
-                 olde = e;
-
-                 for (j = 0; j < 80; j += 1) {
-                   if (j < 16) {
-                     w[j] = x[i + j];
-                   } else {
-                     w[j] = bit_rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1);
-                   }
-                   t = safe_add(safe_add(bit_rol(a, 5), sha1_ft(j, b, c, d)),
-                     safe_add(safe_add(e, w[j]), sha1_kt(j)));
-                   e = d;
-                   d = c;
-                   c = bit_rol(b, 30);
-                   b = a;
-                   a = t;
-                 }
+             return false;
+           }
+         };
 
-                 a = safe_add(a, olda);
-                 b = safe_add(b, oldb);
-                 c = safe_add(c, oldc);
-                 d = safe_add(d, oldd);
-                 e = safe_add(e, olde);
-               }
-               return Array(a, b, c, d, e);
-             }
+         action.ways = function (graph) {
+           return utilArrayUniq([].concat.apply([], nodeIds.map(function (nodeId) {
+             return action.waysForNode(nodeId, graph);
+           })));
+         };
 
-             /**
-              * Perform the appropriate triplet combination function for the current
-              * iteration
-              */
+         action.disabled = function (graph) {
+           for (var i = 0; i < nodeIds.length; i++) {
+             var nodeId = nodeIds[i];
+             var candidates = action.waysForNode(nodeId, graph);
 
-             function sha1_ft(t, b, c, d) {
-               if (t < 20) {
-                 return (b & c) | ((~b) & d);
-               }
-               if (t < 40) {
-                 return b ^ c ^ d;
-               }
-               if (t < 60) {
-                 return (b & c) | (b & d) | (c & d);
-               }
-               return b ^ c ^ d;
+             if (candidates.length === 0 || _wayIDs && _wayIDs.length !== candidates.length) {
+               return 'not_eligible';
              }
+           }
+         };
 
-             /**
-              * Determine the appropriate additive constant for the current iteration
-              */
+         action.limitWays = function (val) {
+           if (!arguments.length) return _wayIDs;
+           _wayIDs = val;
+           return action;
+         };
 
-             function sha1_kt(t) {
-               return (t < 20) ? 1518500249 : (t < 40) ? 1859775393 :
-                 (t < 60) ? -1894007588 : -899497514;
-             }
-           },
-           /**
-            * @class Hashes.SHA256
-            * @param {config}
-            *
-            * A JavaScript implementation of the Secure Hash Algorithm, SHA-256, as defined in FIPS 180-2
-            * Version 2.2 Copyright Angel Marin, Paul Johnston 2000 - 2009.
-            * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
-            * See http://pajhome.org.uk/crypt/md5 for details.
-            * Also http://anmar.eu.org/projects/jssha2/
-            */
-           SHA256: function(options) {
-             /**
-              * Private properties configuration variables. You may need to tweak these to be compatible with
-              * the server-side, but the defaults work in most cases.
-              * @see this.setUpperCase() method
-              * @see this.setPad() method
-              */
-             var hexcase = (options && typeof options.uppercase === 'boolean') ? options.uppercase : false, // hexadecimal output case format. false - lowercase; true - uppercase  */
-               b64pad = (options && typeof options.pad === 'string') ? options.pad : '=',
-               /* base-64 pad character. Default '=' for strict RFC compliance   */
-               utf8 = (options && typeof options.utf8 === 'boolean') ? options.utf8 : true,
-               /* enable/disable utf8 encoding */
-               sha256_K;
+         action.keepHistoryOn = function (val) {
+           if (!arguments.length) return _keepHistoryOn;
+           _keepHistoryOn = val;
+           return action;
+         };
 
-             /* privileged (public) methods */
-             this.hex = function(s) {
-               return rstr2hex(rstr(s, utf8));
-             };
-             this.b64 = function(s) {
-               return rstr2b64(rstr(s, utf8), b64pad);
-             };
-             this.any = function(s, e) {
-               return rstr2any(rstr(s, utf8), e);
-             };
-             this.raw = function(s) {
-               return rstr(s, utf8);
-             };
-             this.hex_hmac = function(k, d) {
-               return rstr2hex(rstr_hmac(k, d));
-             };
-             this.b64_hmac = function(k, d) {
-               return rstr2b64(rstr_hmac(k, d), b64pad);
-             };
-             this.any_hmac = function(k, d, e) {
-               return rstr2any(rstr_hmac(k, d), e);
-             };
-             /**
-              * Perform a simple self-test to see if the VM is working
-              * @return {String} Hexadecimal hash sample
-              * @public
-              */
-             this.vm_test = function() {
-               return hex('abc').toLowerCase() === '900150983cd24fb0d6963f7d28e17f72';
-             };
-             /**
-              * Enable/disable uppercase hexadecimal returned string
-              * @param {boolean}
-              * @return {Object} this
-              * @public
-              */
-             this.setUpperCase = function(a) {
-               if (typeof a === 'boolean') {
-                 hexcase = a;
-               }
-               return this;
-             };
-             /**
-              * @description Defines a base64 pad string
-              * @param {string} Pad
-              * @return {Object} this
-              * @public
-              */
-             this.setPad = function(a) {
-               b64pad = a || b64pad;
-               return this;
-             };
-             /**
-              * Defines a base64 pad string
-              * @param {boolean}
-              * @return {Object} this
-              * @public
-              */
-             this.setUTF8 = function(a) {
-               if (typeof a === 'boolean') {
-                 utf8 = a;
-               }
-               return this;
-             };
+         return action;
+       }
 
-             // private methods
+       function coreGraph(other, mutable) {
+         if (!(this instanceof coreGraph)) return new coreGraph(other, mutable);
 
-             /**
-              * Calculate the SHA-512 of a raw string
-              */
+         if (other instanceof coreGraph) {
+           var base = other.base();
+           this.entities = Object.assign(Object.create(base.entities), other.entities);
+           this._parentWays = Object.assign(Object.create(base.parentWays), other._parentWays);
+           this._parentRels = Object.assign(Object.create(base.parentRels), other._parentRels);
+         } else {
+           this.entities = Object.create({});
+           this._parentWays = Object.create({});
+           this._parentRels = Object.create({});
+           this.rebase(other || [], [this]);
+         }
 
-             function rstr(s, utf8) {
-               s = (utf8) ? utf8Encode(s) : s;
-               return binb2rstr(binb(rstr2binb(s), s.length * 8));
-             }
+         this.transients = {};
+         this._childNodes = {};
+         this.frozen = !mutable;
+       }
+       coreGraph.prototype = {
+         hasEntity: function hasEntity(id) {
+           return this.entities[id];
+         },
+         entity: function entity(id) {
+           var entity = this.entities[id]; //https://github.com/openstreetmap/iD/issues/3973#issuecomment-307052376
 
-             /**
-              * Calculate the HMAC-sha256 of a key and some data (raw strings)
-              */
+           if (!entity) {
+             entity = this.entities.__proto__[id]; // eslint-disable-line no-proto
+           }
 
-             function rstr_hmac(key, data) {
-               key = (utf8) ? utf8Encode(key) : key;
-               data = (utf8) ? utf8Encode(data) : data;
-               var hash, i = 0,
-                 bkey = rstr2binb(key),
-                 ipad = Array(16),
-                 opad = Array(16);
+           if (!entity) {
+             throw new Error('entity ' + id + ' not found');
+           }
 
-               if (bkey.length > 16) {
-                 bkey = binb(bkey, key.length * 8);
-               }
+           return entity;
+         },
+         geometry: function geometry(id) {
+           return this.entity(id).geometry(this);
+         },
+         "transient": function transient(entity, key, fn) {
+           var id = entity.id;
+           var transients = this.transients[id] || (this.transients[id] = {});
 
-               for (; i < 16; i += 1) {
-                 ipad[i] = bkey[i] ^ 0x36363636;
-                 opad[i] = bkey[i] ^ 0x5C5C5C5C;
-               }
+           if (transients[key] !== undefined) {
+             return transients[key];
+           }
 
-               hash = binb(ipad.concat(rstr2binb(data)), 512 + data.length * 8);
-               return binb2rstr(binb(opad.concat(hash), 512 + 256));
-             }
+           transients[key] = fn.call(entity);
+           return transients[key];
+         },
+         parentWays: function parentWays(entity) {
+           var parents = this._parentWays[entity.id];
+           var result = [];
 
-             /*
-              * Main sha256 function, with its support functions
-              */
+           if (parents) {
+             parents.forEach(function (id) {
+               result.push(this.entity(id));
+             }, this);
+           }
 
-             function sha256_S(X, n) {
-               return (X >>> n) | (X << (32 - n));
-             }
+           return result;
+         },
+         isPoi: function isPoi(entity) {
+           var parents = this._parentWays[entity.id];
+           return !parents || parents.size === 0;
+         },
+         isShared: function isShared(entity) {
+           var parents = this._parentWays[entity.id];
+           return parents && parents.size > 1;
+         },
+         parentRelations: function parentRelations(entity) {
+           var parents = this._parentRels[entity.id];
+           var result = [];
 
-             function sha256_R(X, n) {
-               return (X >>> n);
-             }
+           if (parents) {
+             parents.forEach(function (id) {
+               result.push(this.entity(id));
+             }, this);
+           }
 
-             function sha256_Ch(x, y, z) {
-               return ((x & y) ^ ((~x) & z));
-             }
+           return result;
+         },
+         parentMultipolygons: function parentMultipolygons(entity) {
+           return this.parentRelations(entity).filter(function (relation) {
+             return relation.isMultipolygon();
+           });
+         },
+         childNodes: function childNodes(entity) {
+           if (this._childNodes[entity.id]) return this._childNodes[entity.id];
+           if (!entity.nodes) return [];
+           var nodes = [];
 
-             function sha256_Maj(x, y, z) {
-               return ((x & y) ^ (x & z) ^ (y & z));
-             }
+           for (var i = 0; i < entity.nodes.length; i++) {
+             nodes[i] = this.entity(entity.nodes[i]);
+           }
+           this._childNodes[entity.id] = nodes;
+           return this._childNodes[entity.id];
+         },
+         base: function base() {
+           return {
+             'entities': Object.getPrototypeOf(this.entities),
+             'parentWays': Object.getPrototypeOf(this._parentWays),
+             'parentRels': Object.getPrototypeOf(this._parentRels)
+           };
+         },
+         // Unlike other graph methods, rebase mutates in place. This is because it
+         // is used only during the history operation that merges newly downloaded
+         // data into each state. To external consumers, it should appear as if the
+         // graph always contained the newly downloaded data.
+         rebase: function rebase(entities, stack, force) {
+           var base = this.base();
+           var i, j, k, id;
 
-             function sha256_Sigma0256(x) {
-               return (sha256_S(x, 2) ^ sha256_S(x, 13) ^ sha256_S(x, 22));
-             }
+           for (i = 0; i < entities.length; i++) {
+             var entity = entities[i];
+             if (!entity.visible || !force && base.entities[entity.id]) continue; // Merging data into the base graph
 
-             function sha256_Sigma1256(x) {
-               return (sha256_S(x, 6) ^ sha256_S(x, 11) ^ sha256_S(x, 25));
-             }
+             base.entities[entity.id] = entity;
 
-             function sha256_Gamma0256(x) {
-               return (sha256_S(x, 7) ^ sha256_S(x, 18) ^ sha256_R(x, 3));
-             }
+             this._updateCalculated(undefined, entity, base.parentWays, base.parentRels); // Restore provisionally-deleted nodes that are discovered to have an extant parent
 
-             function sha256_Gamma1256(x) {
-               return (sha256_S(x, 17) ^ sha256_S(x, 19) ^ sha256_R(x, 10));
-             }
 
-             sha256_K = [
-               1116352408, 1899447441, -1245643825, -373957723, 961987163, 1508970993, -1841331548, -1424204075, -670586216, 310598401, 607225278, 1426881987,
-               1925078388, -2132889090, -1680079193, -1046744716, -459576895, -272742522,
-               264347078, 604807628, 770255983, 1249150122, 1555081692, 1996064986, -1740746414, -1473132947, -1341970488, -1084653625, -958395405, -710438585,
-               113926993, 338241895, 666307205, 773529912, 1294757372, 1396182291,
-               1695183700, 1986661051, -2117940946, -1838011259, -1564481375, -1474664885, -1035236496, -949202525, -778901479, -694614492, -200395387, 275423344,
-               430227734, 506948616, 659060556, 883997877, 958139571, 1322822218,
-               1537002063, 1747873779, 1955562222, 2024104815, -2067236844, -1933114872, -1866530822, -1538233109, -1090935817, -965641998
-             ];
+             if (entity.type === 'way') {
+               for (j = 0; j < entity.nodes.length; j++) {
+                 id = entity.nodes[j];
 
-             function binb(m, l) {
-               var HASH = [1779033703, -1150833019, 1013904242, -1521486534,
-                 1359893119, -1694144372, 528734635, 1541459225
-               ];
-               var W = new Array(64);
-               var a, b, c, d, e, f, g, h;
-               var i, j, T1, T2;
-
-               /* append padding */
-               m[l >> 5] |= 0x80 << (24 - l % 32);
-               m[((l + 64 >> 9) << 4) + 15] = l;
-
-               for (i = 0; i < m.length; i += 16) {
-                 a = HASH[0];
-                 b = HASH[1];
-                 c = HASH[2];
-                 d = HASH[3];
-                 e = HASH[4];
-                 f = HASH[5];
-                 g = HASH[6];
-                 h = HASH[7];
-
-                 for (j = 0; j < 64; j += 1) {
-                   if (j < 16) {
-                     W[j] = m[j + i];
-                   } else {
-                     W[j] = safe_add(safe_add(safe_add(sha256_Gamma1256(W[j - 2]), W[j - 7]),
-                       sha256_Gamma0256(W[j - 15])), W[j - 16]);
-                   }
+                 for (k = 1; k < stack.length; k++) {
+                   var ents = stack[k].entities;
 
-                   T1 = safe_add(safe_add(safe_add(safe_add(h, sha256_Sigma1256(e)), sha256_Ch(e, f, g)),
-                     sha256_K[j]), W[j]);
-                   T2 = safe_add(sha256_Sigma0256(a), sha256_Maj(a, b, c));
-                   h = g;
-                   g = f;
-                   f = e;
-                   e = safe_add(d, T1);
-                   d = c;
-                   c = b;
-                   b = a;
-                   a = safe_add(T1, T2);
+                   if (ents.hasOwnProperty(id) && ents[id] === undefined) {
+                     delete ents[id];
+                   }
                  }
-
-                 HASH[0] = safe_add(a, HASH[0]);
-                 HASH[1] = safe_add(b, HASH[1]);
-                 HASH[2] = safe_add(c, HASH[2]);
-                 HASH[3] = safe_add(d, HASH[3]);
-                 HASH[4] = safe_add(e, HASH[4]);
-                 HASH[5] = safe_add(f, HASH[5]);
-                 HASH[6] = safe_add(g, HASH[6]);
-                 HASH[7] = safe_add(h, HASH[7]);
                }
-               return HASH;
              }
+           }
 
-           },
-
-           /**
-            * @class Hashes.SHA512
-            * @param {config}
-            *
-            * A JavaScript implementation of the Secure Hash Algorithm, SHA-512, as defined in FIPS 180-2
-            * Version 2.2 Copyright Anonymous Contributor, Paul Johnston 2000 - 2009.
-            * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
-            * See http://pajhome.org.uk/crypt/md5 for details.
-            */
-           SHA512: function(options) {
-             /**
-              * Private properties configuration variables. You may need to tweak these to be compatible with
-              * the server-side, but the defaults work in most cases.
-              * @see this.setUpperCase() method
-              * @see this.setPad() method
-              */
-             var hexcase = (options && typeof options.uppercase === 'boolean') ? options.uppercase : false,
-               /* hexadecimal output case format. false - lowercase; true - uppercase  */
-               b64pad = (options && typeof options.pad === 'string') ? options.pad : '=',
-               /* base-64 pad character. Default '=' for strict RFC compliance   */
-               utf8 = (options && typeof options.utf8 === 'boolean') ? options.utf8 : true,
-               /* enable/disable utf8 encoding */
-               sha512_k;
+           for (i = 0; i < stack.length; i++) {
+             stack[i]._updateRebased();
+           }
+         },
+         _updateRebased: function _updateRebased() {
+           var base = this.base();
+           Object.keys(this._parentWays).forEach(function (child) {
+             if (base.parentWays[child]) {
+               base.parentWays[child].forEach(function (id) {
+                 if (!this.entities.hasOwnProperty(id)) {
+                   this._parentWays[child].add(id);
+                 }
+               }, this);
+             }
+           }, this);
+           Object.keys(this._parentRels).forEach(function (child) {
+             if (base.parentRels[child]) {
+               base.parentRels[child].forEach(function (id) {
+                 if (!this.entities.hasOwnProperty(id)) {
+                   this._parentRels[child].add(id);
+                 }
+               }, this);
+             }
+           }, this);
+           this.transients = {}; // this._childNodes is not updated, under the assumption that
+           // ways are always downloaded with their child nodes.
+         },
+         // Updates calculated properties (parentWays, parentRels) for the specified change
+         _updateCalculated: function _updateCalculated(oldentity, entity, parentWays, parentRels) {
+           parentWays = parentWays || this._parentWays;
+           parentRels = parentRels || this._parentRels;
+           var type = entity && entity.type || oldentity && oldentity.type;
+           var removed, added, i;
+
+           if (type === 'way') {
+             // Update parentWays
+             if (oldentity && entity) {
+               removed = utilArrayDifference(oldentity.nodes, entity.nodes);
+               added = utilArrayDifference(entity.nodes, oldentity.nodes);
+             } else if (oldentity) {
+               removed = oldentity.nodes;
+               added = [];
+             } else if (entity) {
+               removed = [];
+               added = entity.nodes;
+             }
+
+             for (i = 0; i < removed.length; i++) {
+               // make a copy of prototype property, store as own property, and update..
+               parentWays[removed[i]] = new Set(parentWays[removed[i]]);
+               parentWays[removed[i]]["delete"](oldentity.id);
+             }
+
+             for (i = 0; i < added.length; i++) {
+               // make a copy of prototype property, store as own property, and update..
+               parentWays[added[i]] = new Set(parentWays[added[i]]);
+               parentWays[added[i]].add(entity.id);
+             }
+           } else if (type === 'relation') {
+             // Update parentRels
+             // diff only on the IDs since the same entity can be a member multiple times with different roles
+             var oldentityMemberIDs = oldentity ? oldentity.members.map(function (m) {
+               return m.id;
+             }) : [];
+             var entityMemberIDs = entity ? entity.members.map(function (m) {
+               return m.id;
+             }) : [];
+
+             if (oldentity && entity) {
+               removed = utilArrayDifference(oldentityMemberIDs, entityMemberIDs);
+               added = utilArrayDifference(entityMemberIDs, oldentityMemberIDs);
+             } else if (oldentity) {
+               removed = oldentityMemberIDs;
+               added = [];
+             } else if (entity) {
+               removed = [];
+               added = entityMemberIDs;
+             }
+
+             for (i = 0; i < removed.length; i++) {
+               // make a copy of prototype property, store as own property, and update..
+               parentRels[removed[i]] = new Set(parentRels[removed[i]]);
+               parentRels[removed[i]]["delete"](oldentity.id);
+             }
+
+             for (i = 0; i < added.length; i++) {
+               // make a copy of prototype property, store as own property, and update..
+               parentRels[added[i]] = new Set(parentRels[added[i]]);
+               parentRels[added[i]].add(entity.id);
+             }
+           }
+         },
+         replace: function replace(entity) {
+           if (this.entities[entity.id] === entity) return this;
+           return this.update(function () {
+             this._updateCalculated(this.entities[entity.id], entity);
 
-             /* privileged (public) methods */
-             this.hex = function(s) {
-               return rstr2hex(rstr(s));
-             };
-             this.b64 = function(s) {
-               return rstr2b64(rstr(s), b64pad);
-             };
-             this.any = function(s, e) {
-               return rstr2any(rstr(s), e);
-             };
-             this.raw = function(s) {
-               return rstr(s);
-             };
-             this.hex_hmac = function(k, d) {
-               return rstr2hex(rstr_hmac(k, d));
-             };
-             this.b64_hmac = function(k, d) {
-               return rstr2b64(rstr_hmac(k, d), b64pad);
-             };
-             this.any_hmac = function(k, d, e) {
-               return rstr2any(rstr_hmac(k, d), e);
-             };
-             /**
-              * Perform a simple self-test to see if the VM is working
-              * @return {String} Hexadecimal hash sample
-              * @public
-              */
-             this.vm_test = function() {
-               return hex('abc').toLowerCase() === '900150983cd24fb0d6963f7d28e17f72';
-             };
-             /**
-              * @description Enable/disable uppercase hexadecimal returned string
-              * @param {boolean}
-              * @return {Object} this
-              * @public
-              */
-             this.setUpperCase = function(a) {
-               if (typeof a === 'boolean') {
-                 hexcase = a;
-               }
-               return this;
-             };
-             /**
-              * @description Defines a base64 pad string
-              * @param {string} Pad
-              * @return {Object} this
-              * @public
-              */
-             this.setPad = function(a) {
-               b64pad = a || b64pad;
-               return this;
-             };
-             /**
-              * @description Defines a base64 pad string
-              * @param {boolean}
-              * @return {Object} this
-              * @public
-              */
-             this.setUTF8 = function(a) {
-               if (typeof a === 'boolean') {
-                 utf8 = a;
-               }
-               return this;
-             };
+             this.entities[entity.id] = entity;
+           });
+         },
+         remove: function remove(entity) {
+           return this.update(function () {
+             this._updateCalculated(entity, undefined);
 
-             /* private methods */
+             this.entities[entity.id] = undefined;
+           });
+         },
+         revert: function revert(id) {
+           var baseEntity = this.base().entities[id];
+           var headEntity = this.entities[id];
+           if (headEntity === baseEntity) return this;
+           return this.update(function () {
+             this._updateCalculated(headEntity, baseEntity);
+
+             delete this.entities[id];
+           });
+         },
+         update: function update() {
+           var graph = this.frozen ? coreGraph(this, true) : this;
 
-             /**
-              * Calculate the SHA-512 of a raw string
-              */
+           for (var i = 0; i < arguments.length; i++) {
+             arguments[i].call(graph, graph);
+           }
 
-             function rstr(s) {
-               s = (utf8) ? utf8Encode(s) : s;
-               return binb2rstr(binb(rstr2binb(s), s.length * 8));
-             }
-             /*
-              * Calculate the HMAC-SHA-512 of a key and some data (raw strings)
-              */
+           if (this.frozen) graph.frozen = true;
+           return graph;
+         },
+         // Obliterates any existing entities
+         load: function load(entities) {
+           var base = this.base();
+           this.entities = Object.create(base.entities);
 
-             function rstr_hmac(key, data) {
-               key = (utf8) ? utf8Encode(key) : key;
-               data = (utf8) ? utf8Encode(data) : data;
+           for (var i in entities) {
+             this.entities[i] = entities[i];
 
-               var hash, i = 0,
-                 bkey = rstr2binb(key),
-                 ipad = Array(32),
-                 opad = Array(32);
+             this._updateCalculated(base.entities[i], this.entities[i]);
+           }
 
-               if (bkey.length > 32) {
-                 bkey = binb(bkey, key.length * 8);
-               }
+           return this;
+         }
+       };
 
-               for (; i < 32; i += 1) {
-                 ipad[i] = bkey[i] ^ 0x36363636;
-                 opad[i] = bkey[i] ^ 0x5C5C5C5C;
-               }
+       function osmTurn(turn) {
+         if (!(this instanceof osmTurn)) {
+           return new osmTurn(turn);
+         }
 
-               hash = binb(ipad.concat(rstr2binb(data)), 1024 + data.length * 8);
-               return binb2rstr(binb(opad.concat(hash), 1024 + 512));
-             }
+         Object.assign(this, turn);
+       }
+       function osmIntersection(graph, startVertexId, maxDistance) {
+         maxDistance = maxDistance || 30; // in meters
 
-             /**
-              * Calculate the SHA-512 of an array of big-endian dwords, and a bit length
-              */
+         var vgraph = coreGraph(); // virtual graph
 
-             function binb(x, len) {
-               var j, i, l,
-                 W = new Array(80),
-                 hash = new Array(16),
-                 //Initial hash values
-                 H = [
-                   new int64(0x6a09e667, -205731576),
-                   new int64(-1150833019, -2067093701),
-                   new int64(0x3c6ef372, -23791573),
-                   new int64(-1521486534, 0x5f1d36f1),
-                   new int64(0x510e527f, -1377402159),
-                   new int64(-1694144372, 0x2b3e6c1f),
-                   new int64(0x1f83d9ab, -79577749),
-                   new int64(0x5be0cd19, 0x137e2179)
-                 ],
-                 T1 = new int64(0, 0),
-                 T2 = new int64(0, 0),
-                 a = new int64(0, 0),
-                 b = new int64(0, 0),
-                 c = new int64(0, 0),
-                 d = new int64(0, 0),
-                 e = new int64(0, 0),
-                 f = new int64(0, 0),
-                 g = new int64(0, 0),
-                 h = new int64(0, 0),
-                 //Temporary variables not specified by the document
-                 s0 = new int64(0, 0),
-                 s1 = new int64(0, 0),
-                 Ch = new int64(0, 0),
-                 Maj = new int64(0, 0),
-                 r1 = new int64(0, 0),
-                 r2 = new int64(0, 0),
-                 r3 = new int64(0, 0);
-
-               if (sha512_k === undefined) {
-                 //SHA512 constants
-                 sha512_k = [
-                   new int64(0x428a2f98, -685199838), new int64(0x71374491, 0x23ef65cd),
-                   new int64(-1245643825, -330482897), new int64(-373957723, -2121671748),
-                   new int64(0x3956c25b, -213338824), new int64(0x59f111f1, -1241133031),
-                   new int64(-1841331548, -1357295717), new int64(-1424204075, -630357736),
-                   new int64(-670586216, -1560083902), new int64(0x12835b01, 0x45706fbe),
-                   new int64(0x243185be, 0x4ee4b28c), new int64(0x550c7dc3, -704662302),
-                   new int64(0x72be5d74, -226784913), new int64(-2132889090, 0x3b1696b1),
-                   new int64(-1680079193, 0x25c71235), new int64(-1046744716, -815192428),
-                   new int64(-459576895, -1628353838), new int64(-272742522, 0x384f25e3),
-                   new int64(0xfc19dc6, -1953704523), new int64(0x240ca1cc, 0x77ac9c65),
-                   new int64(0x2de92c6f, 0x592b0275), new int64(0x4a7484aa, 0x6ea6e483),
-                   new int64(0x5cb0a9dc, -1119749164), new int64(0x76f988da, -2096016459),
-                   new int64(-1740746414, -295247957), new int64(-1473132947, 0x2db43210),
-                   new int64(-1341970488, -1728372417), new int64(-1084653625, -1091629340),
-                   new int64(-958395405, 0x3da88fc2), new int64(-710438585, -1828018395),
-                   new int64(0x6ca6351, -536640913), new int64(0x14292967, 0xa0e6e70),
-                   new int64(0x27b70a85, 0x46d22ffc), new int64(0x2e1b2138, 0x5c26c926),
-                   new int64(0x4d2c6dfc, 0x5ac42aed), new int64(0x53380d13, -1651133473),
-                   new int64(0x650a7354, -1951439906), new int64(0x766a0abb, 0x3c77b2a8),
-                   new int64(-2117940946, 0x47edaee6), new int64(-1838011259, 0x1482353b),
-                   new int64(-1564481375, 0x4cf10364), new int64(-1474664885, -1136513023),
-                   new int64(-1035236496, -789014639), new int64(-949202525, 0x654be30),
-                   new int64(-778901479, -688958952), new int64(-694614492, 0x5565a910),
-                   new int64(-200395387, 0x5771202a), new int64(0x106aa070, 0x32bbd1b8),
-                   new int64(0x19a4c116, -1194143544), new int64(0x1e376c08, 0x5141ab53),
-                   new int64(0x2748774c, -544281703), new int64(0x34b0bcb5, -509917016),
-                   new int64(0x391c0cb3, -976659869), new int64(0x4ed8aa4a, -482243893),
-                   new int64(0x5b9cca4f, 0x7763e373), new int64(0x682e6ff3, -692930397),
-                   new int64(0x748f82ee, 0x5defb2fc), new int64(0x78a5636f, 0x43172f60),
-                   new int64(-2067236844, -1578062990), new int64(-1933114872, 0x1a6439ec),
-                   new int64(-1866530822, 0x23631e28), new int64(-1538233109, -561857047),
-                   new int64(-1090935817, -1295615723), new int64(-965641998, -479046869),
-                   new int64(-903397682, -366583396), new int64(-779700025, 0x21c0c207),
-                   new int64(-354779690, -840897762), new int64(-176337025, -294727304),
-                   new int64(0x6f067aa, 0x72176fba), new int64(0xa637dc5, -1563912026),
-                   new int64(0x113f9804, -1090974290), new int64(0x1b710b35, 0x131c471b),
-                   new int64(0x28db77f5, 0x23047d84), new int64(0x32caab7b, 0x40c72493),
-                   new int64(0x3c9ebe0a, 0x15c9bebc), new int64(0x431d67c4, -1676669620),
-                   new int64(0x4cc5d4be, -885112138), new int64(0x597f299c, -60457430),
-                   new int64(0x5fcb6fab, 0x3ad6faec), new int64(0x6c44198c, 0x4a475817)
-                 ];
-               }
-
-               for (i = 0; i < 80; i += 1) {
-                 W[i] = new int64(0, 0);
-               }
-
-               // append padding to the source string. The format is described in the FIPS.
-               x[len >> 5] |= 0x80 << (24 - (len & 0x1f));
-               x[((len + 128 >> 10) << 5) + 31] = len;
-               l = x.length;
-               for (i = 0; i < l; i += 32) { //32 dwords is the block size
-                 int64copy(a, H[0]);
-                 int64copy(b, H[1]);
-                 int64copy(c, H[2]);
-                 int64copy(d, H[3]);
-                 int64copy(e, H[4]);
-                 int64copy(f, H[5]);
-                 int64copy(g, H[6]);
-                 int64copy(h, H[7]);
-
-                 for (j = 0; j < 16; j += 1) {
-                   W[j].h = x[i + 2 * j];
-                   W[j].l = x[i + 2 * j + 1];
-                 }
+         var i, j, k;
 
-                 for (j = 16; j < 80; j += 1) {
-                   //sigma1
-                   int64rrot(r1, W[j - 2], 19);
-                   int64revrrot(r2, W[j - 2], 29);
-                   int64shr(r3, W[j - 2], 6);
-                   s1.l = r1.l ^ r2.l ^ r3.l;
-                   s1.h = r1.h ^ r2.h ^ r3.h;
-                   //sigma0
-                   int64rrot(r1, W[j - 15], 1);
-                   int64rrot(r2, W[j - 15], 8);
-                   int64shr(r3, W[j - 15], 7);
-                   s0.l = r1.l ^ r2.l ^ r3.l;
-                   s0.h = r1.h ^ r2.h ^ r3.h;
-
-                   int64add4(W[j], s1, W[j - 7], s0, W[j - 16]);
-                 }
+         function memberOfRestriction(entity) {
+           return graph.parentRelations(entity).some(function (r) {
+             return r.isRestriction();
+           });
+         }
 
-                 for (j = 0; j < 80; j += 1) {
-                   //Ch
-                   Ch.l = (e.l & f.l) ^ (~e.l & g.l);
-                   Ch.h = (e.h & f.h) ^ (~e.h & g.h);
-
-                   //Sigma1
-                   int64rrot(r1, e, 14);
-                   int64rrot(r2, e, 18);
-                   int64revrrot(r3, e, 9);
-                   s1.l = r1.l ^ r2.l ^ r3.l;
-                   s1.h = r1.h ^ r2.h ^ r3.h;
-
-                   //Sigma0
-                   int64rrot(r1, a, 28);
-                   int64revrrot(r2, a, 2);
-                   int64revrrot(r3, a, 7);
-                   s0.l = r1.l ^ r2.l ^ r3.l;
-                   s0.h = r1.h ^ r2.h ^ r3.h;
-
-                   //Maj
-                   Maj.l = (a.l & b.l) ^ (a.l & c.l) ^ (b.l & c.l);
-                   Maj.h = (a.h & b.h) ^ (a.h & c.h) ^ (b.h & c.h);
-
-                   int64add5(T1, h, s1, Ch, sha512_k[j], W[j]);
-                   int64add(T2, s0, Maj);
-
-                   int64copy(h, g);
-                   int64copy(g, f);
-                   int64copy(f, e);
-                   int64add(e, d, T1);
-                   int64copy(d, c);
-                   int64copy(c, b);
-                   int64copy(b, a);
-                   int64add(a, T1, T2);
-                 }
-                 int64add(H[0], H[0], a);
-                 int64add(H[1], H[1], b);
-                 int64add(H[2], H[2], c);
-                 int64add(H[3], H[3], d);
-                 int64add(H[4], H[4], e);
-                 int64add(H[5], H[5], f);
-                 int64add(H[6], H[6], g);
-                 int64add(H[7], H[7], h);
+         function isRoad(way) {
+           if (way.isArea() || way.isDegenerate()) return false;
+           var roads = {
+             'motorway': true,
+             'motorway_link': true,
+             'trunk': true,
+             'trunk_link': true,
+             'primary': true,
+             'primary_link': true,
+             'secondary': true,
+             'secondary_link': true,
+             'tertiary': true,
+             'tertiary_link': true,
+             'residential': true,
+             'unclassified': true,
+             'living_street': true,
+             'service': true,
+             'road': true,
+             'track': true
+           };
+           return roads[way.tags.highway];
+         }
+
+         var startNode = graph.entity(startVertexId);
+         var checkVertices = [startNode];
+         var checkWays;
+         var vertices = [];
+         var vertexIds = [];
+         var vertex;
+         var ways = [];
+         var wayIds = [];
+         var way;
+         var nodes = [];
+         var node;
+         var parents = [];
+         var parent; // `actions` will store whatever actions must be performed to satisfy
+         // preconditions for adding a turn restriction to this intersection.
+         //  - Remove any existing degenerate turn restrictions (missing from/to, etc)
+         //  - Reverse oneways so that they are drawn in the forward direction
+         //  - Split ways on key vertices
+
+         var actions = []; // STEP 1:  walk the graph outwards from starting vertex to search
+         //  for more key vertices and ways to include in the intersection..
+
+         while (checkVertices.length) {
+           vertex = checkVertices.pop(); // check this vertex for parent ways that are roads
+
+           checkWays = graph.parentWays(vertex);
+           var hasWays = false;
+
+           for (i = 0; i < checkWays.length; i++) {
+             way = checkWays[i];
+             if (!isRoad(way) && !memberOfRestriction(way)) continue;
+             ways.push(way); // it's a road, or it's already in a turn restriction
+
+             hasWays = true; // check the way's children for more key vertices
+
+             nodes = utilArrayUniq(graph.childNodes(way));
+
+             for (j = 0; j < nodes.length; j++) {
+               node = nodes[j];
+               if (node === vertex) continue; // same thing
+
+               if (vertices.indexOf(node) !== -1) continue; // seen it already
+
+               if (geoSphericalDistance(node.loc, startNode.loc) > maxDistance) continue; // too far from start
+               // a key vertex will have parents that are also roads
+
+               var hasParents = false;
+               parents = graph.parentWays(node);
+
+               for (k = 0; k < parents.length; k++) {
+                 parent = parents[k];
+                 if (parent === way) continue; // same thing
+
+                 if (ways.indexOf(parent) !== -1) continue; // seen it already
+
+                 if (!isRoad(parent)) continue; // not a road
+
+                 hasParents = true;
+                 break;
                }
 
-               //represent the hash as an array of 32-bit dwords
-               for (i = 0; i < 8; i += 1) {
-                 hash[2 * i] = H[i].h;
-                 hash[2 * i + 1] = H[i].l;
+               if (hasParents) {
+                 checkVertices.push(node);
                }
-               return hash;
              }
+           }
 
-             //A constructor for 64-bit numbers
-
-             function int64(h, l) {
-               this.h = h;
-               this.l = l;
-               //this.toString = int64toString;
-             }
+           if (hasWays) {
+             vertices.push(vertex);
+           }
+         }
 
-             //Copies src into dst, assuming both are 64-bit numbers
+         vertices = utilArrayUniq(vertices);
+         ways = utilArrayUniq(ways); // STEP 2:  Build a virtual graph containing only the entities in the intersection..
+         // Everything done after this step should act on the virtual graph
+         // Any actions that must be performed later to the main graph go in `actions` array
 
-             function int64copy(dst, src) {
-               dst.h = src.h;
-               dst.l = src.l;
+         ways.forEach(function (way) {
+           graph.childNodes(way).forEach(function (node) {
+             vgraph = vgraph.replace(node);
+           });
+           vgraph = vgraph.replace(way);
+           graph.parentRelations(way).forEach(function (relation) {
+             if (relation.isRestriction()) {
+               if (relation.isValidRestriction(graph)) {
+                 vgraph = vgraph.replace(relation);
+               } else if (relation.isComplete(graph)) {
+                 actions.push(actionDeleteRelation(relation.id));
+               }
              }
+           });
+         }); // STEP 3:  Force all oneways to be drawn in the forward direction
 
-             //Right-rotates a 64-bit number by shift
-             //Won't handle cases of shift>=32
-             //The function revrrot() is for that
-
-             function int64rrot(dst, x, shift) {
-               dst.l = (x.l >>> shift) | (x.h << (32 - shift));
-               dst.h = (x.h >>> shift) | (x.l << (32 - shift));
-             }
+         ways.forEach(function (w) {
+           var way = vgraph.entity(w.id);
 
-             //Reverses the dwords of the source and then rotates right by shift.
-             //This is equivalent to rotation by 32+shift
+           if (way.tags.oneway === '-1') {
+             var action = actionReverse(way.id, {
+               reverseOneway: true
+             });
+             actions.push(action);
+             vgraph = action(vgraph);
+           }
+         }); // STEP 4:  Split ways on key vertices
+
+         var origCount = osmEntity.id.next.way;
+         vertices.forEach(function (v) {
+           // This is an odd way to do it, but we need to find all the ways that
+           // will be split here, then split them one at a time to ensure that these
+           // actions can be replayed on the main graph exactly in the same order.
+           // (It is unintuitive, but the order of ways returned from graph.parentWays()
+           // is arbitrary, depending on how the main graph and vgraph were built)
+           var splitAll = actionSplit([v.id]).keepHistoryOn('first');
+
+           if (!splitAll.disabled(vgraph)) {
+             splitAll.ways(vgraph).forEach(function (way) {
+               var splitOne = actionSplit([v.id]).limitWays([way.id]).keepHistoryOn('first');
+               actions.push(splitOne);
+               vgraph = splitOne(vgraph);
+             });
+           }
+         }); // In here is where we should also split the intersection at nearby junction.
+         //   for https://github.com/mapbox/iD-internal/issues/31
+         // nearbyVertices.forEach(function(v) {
+         // });
+         // Reasons why we reset the way id count here:
+         //  1. Continuity with way ids created by the splits so that we can replay
+         //     these actions later if the user decides to create a turn restriction
+         //  2. Avoids churning way ids just by hovering over a vertex
+         //     and displaying the turn restriction editor
 
-             function int64revrrot(dst, x, shift) {
-               dst.l = (x.h >>> shift) | (x.l << (32 - shift));
-               dst.h = (x.l >>> shift) | (x.h << (32 - shift));
-             }
+         osmEntity.id.next.way = origCount; // STEP 5:  Update arrays to point to vgraph entities
 
-             //Bitwise-shifts right a 64-bit number by shift
-             //Won't handle shift>=32, but it's never needed in SHA512
+         vertexIds = vertices.map(function (v) {
+           return v.id;
+         });
+         vertices = [];
+         ways = [];
+         vertexIds.forEach(function (id) {
+           var vertex = vgraph.entity(id);
+           var parents = vgraph.parentWays(vertex);
+           vertices.push(vertex);
+           ways = ways.concat(parents);
+         });
+         vertices = utilArrayUniq(vertices);
+         ways = utilArrayUniq(ways);
+         vertexIds = vertices.map(function (v) {
+           return v.id;
+         });
+         wayIds = ways.map(function (w) {
+           return w.id;
+         }); // STEP 6:  Update the ways with some metadata that will be useful for
+         // walking the intersection graph later and rendering turn arrows.
 
-             function int64shr(dst, x, shift) {
-               dst.l = (x.l >>> shift) | (x.h << (32 - shift));
-               dst.h = (x.h >>> shift);
-             }
+         function withMetadata(way, vertexIds) {
+           var __oneWay = way.isOneWay(); // which affixes are key vertices?
 
-             //Adds two 64-bit numbers
-             //Like the original implementation, does not rely on 32-bit operations
 
-             function int64add(dst, x, y) {
-               var w0 = (x.l & 0xffff) + (y.l & 0xffff);
-               var w1 = (x.l >>> 16) + (y.l >>> 16) + (w0 >>> 16);
-               var w2 = (x.h & 0xffff) + (y.h & 0xffff) + (w1 >>> 16);
-               var w3 = (x.h >>> 16) + (y.h >>> 16) + (w2 >>> 16);
-               dst.l = (w0 & 0xffff) | (w1 << 16);
-               dst.h = (w2 & 0xffff) | (w3 << 16);
-             }
+           var __first = vertexIds.indexOf(way.first()) !== -1;
 
-             //Same, except with 4 addends. Works faster than adding them one by one.
+           var __last = vertexIds.indexOf(way.last()) !== -1; // what roles is this way eligible for?
 
-             function int64add4(dst, a, b, c, d) {
-               var w0 = (a.l & 0xffff) + (b.l & 0xffff) + (c.l & 0xffff) + (d.l & 0xffff);
-               var w1 = (a.l >>> 16) + (b.l >>> 16) + (c.l >>> 16) + (d.l >>> 16) + (w0 >>> 16);
-               var w2 = (a.h & 0xffff) + (b.h & 0xffff) + (c.h & 0xffff) + (d.h & 0xffff) + (w1 >>> 16);
-               var w3 = (a.h >>> 16) + (b.h >>> 16) + (c.h >>> 16) + (d.h >>> 16) + (w2 >>> 16);
-               dst.l = (w0 & 0xffff) | (w1 << 16);
-               dst.h = (w2 & 0xffff) | (w3 << 16);
-             }
 
-             //Same, except with 5 addends
+           var __via = __first && __last;
 
-             function int64add5(dst, a, b, c, d, e) {
-               var w0 = (a.l & 0xffff) + (b.l & 0xffff) + (c.l & 0xffff) + (d.l & 0xffff) + (e.l & 0xffff),
-                 w1 = (a.l >>> 16) + (b.l >>> 16) + (c.l >>> 16) + (d.l >>> 16) + (e.l >>> 16) + (w0 >>> 16),
-                 w2 = (a.h & 0xffff) + (b.h & 0xffff) + (c.h & 0xffff) + (d.h & 0xffff) + (e.h & 0xffff) + (w1 >>> 16),
-                 w3 = (a.h >>> 16) + (b.h >>> 16) + (c.h >>> 16) + (d.h >>> 16) + (e.h >>> 16) + (w2 >>> 16);
-               dst.l = (w0 & 0xffff) | (w1 << 16);
-               dst.h = (w2 & 0xffff) | (w3 << 16);
-             }
-           },
-           /**
-            * @class Hashes.RMD160
-            * @constructor
-            * @param {Object} [config]
-            *
-            * A JavaScript implementation of the RIPEMD-160 Algorithm
-            * Version 2.2 Copyright Jeremy Lin, Paul Johnston 2000 - 2009.
-            * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
-            * See http://pajhome.org.uk/crypt/md5 for details.
-            * Also http://www.ocf.berkeley.edu/~jjlin/jsotp/
-            */
-           RMD160: function(options) {
-             /**
-              * Private properties configuration variables. You may need to tweak these to be compatible with
-              * the server-side, but the defaults work in most cases.
-              * @see this.setUpperCase() method
-              * @see this.setPad() method
-              */
-             var hexcase = (options && typeof options.uppercase === 'boolean') ? options.uppercase : false,
-               /* hexadecimal output case format. false - lowercase; true - uppercase  */
-               b64pad = (options && typeof options.pad === 'string') ? options.pa : '=',
-               /* base-64 pad character. Default '=' for strict RFC compliance   */
-               utf8 = (options && typeof options.utf8 === 'boolean') ? options.utf8 : true,
-               /* enable/disable utf8 encoding */
-               rmd160_r1 = [
-                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
-                 7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8,
-                 3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12,
-                 1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2,
-                 4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13
-               ],
-               rmd160_r2 = [
-                 5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12,
-                 6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2,
-                 15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13,
-                 8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14,
-                 12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11
-               ],
-               rmd160_s1 = [
-                 11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8,
-                 7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12,
-                 11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5,
-                 11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12,
-                 9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6
-               ],
-               rmd160_s2 = [
-                 8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6,
-                 9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11,
-                 9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5,
-                 15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8,
-                 8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11
-               ];
+           var __from = __first && !__oneWay || __last;
 
-             /* privileged (public) methods */
-             this.hex = function(s) {
-               return rstr2hex(rstr(s));
-             };
-             this.b64 = function(s) {
-               return rstr2b64(rstr(s), b64pad);
-             };
-             this.any = function(s, e) {
-               return rstr2any(rstr(s), e);
-             };
-             this.raw = function(s) {
-               return rstr(s);
-             };
-             this.hex_hmac = function(k, d) {
-               return rstr2hex(rstr_hmac(k, d));
-             };
-             this.b64_hmac = function(k, d) {
-               return rstr2b64(rstr_hmac(k, d), b64pad);
-             };
-             this.any_hmac = function(k, d, e) {
-               return rstr2any(rstr_hmac(k, d), e);
-             };
-             /**
-              * Perform a simple self-test to see if the VM is working
-              * @return {String} Hexadecimal hash sample
-              * @public
-              */
-             this.vm_test = function() {
-               return hex('abc').toLowerCase() === '900150983cd24fb0d6963f7d28e17f72';
-             };
-             /**
-              * @description Enable/disable uppercase hexadecimal returned string
-              * @param {boolean}
-              * @return {Object} this
-              * @public
-              */
-             this.setUpperCase = function(a) {
-               if (typeof a === 'boolean') {
-                 hexcase = a;
-               }
-               return this;
-             };
-             /**
-              * @description Defines a base64 pad string
-              * @param {string} Pad
-              * @return {Object} this
-              * @public
-              */
-             this.setPad = function(a) {
-               if (typeof a !== 'undefined') {
-                 b64pad = a;
-               }
-               return this;
-             };
-             /**
-              * @description Defines a base64 pad string
-              * @param {boolean}
-              * @return {Object} this
-              * @public
-              */
-             this.setUTF8 = function(a) {
-               if (typeof a === 'boolean') {
-                 utf8 = a;
-               }
-               return this;
-             };
+           var __to = __first || __last && !__oneWay;
 
-             /* private methods */
+           return way.update({
+             __first: __first,
+             __last: __last,
+             __from: __from,
+             __via: __via,
+             __to: __to,
+             __oneWay: __oneWay
+           });
+         }
 
-             /**
-              * Calculate the rmd160 of a raw string
-              */
+         ways = [];
+         wayIds.forEach(function (id) {
+           var way = withMetadata(vgraph.entity(id), vertexIds);
+           vgraph = vgraph.replace(way);
+           ways.push(way);
+         }); // STEP 7:  Simplify - This is an iterative process where we:
+         //  1. Find trivial vertices with only 2 parents
+         //  2. trim off the leaf way from those vertices and remove from vgraph
 
-             function rstr(s) {
-               s = (utf8) ? utf8Encode(s) : s;
-               return binl2rstr(binl(rstr2binl(s), s.length * 8));
-             }
+         var keepGoing;
+         var removeWayIds = [];
+         var removeVertexIds = [];
 
-             /**
-              * Calculate the HMAC-rmd160 of a key and some data (raw strings)
-              */
+         do {
+           keepGoing = false;
+           checkVertices = vertexIds.slice();
 
-             function rstr_hmac(key, data) {
-               key = (utf8) ? utf8Encode(key) : key;
-               data = (utf8) ? utf8Encode(data) : data;
-               var i, hash,
-                 bkey = rstr2binl(key),
-                 ipad = Array(16),
-                 opad = Array(16);
+           for (i = 0; i < checkVertices.length; i++) {
+             var vertexId = checkVertices[i];
+             vertex = vgraph.hasEntity(vertexId);
 
-               if (bkey.length > 16) {
-                 bkey = binl(bkey, key.length * 8);
+             if (!vertex) {
+               if (vertexIds.indexOf(vertexId) !== -1) {
+                 vertexIds.splice(vertexIds.indexOf(vertexId), 1); // stop checking this one
                }
 
-               for (i = 0; i < 16; i += 1) {
-                 ipad[i] = bkey[i] ^ 0x36363636;
-                 opad[i] = bkey[i] ^ 0x5C5C5C5C;
-               }
-               hash = binl(ipad.concat(rstr2binl(data)), 512 + data.length * 8);
-               return binl2rstr(binl(opad.concat(hash), 512 + 160));
+               removeVertexIds.push(vertexId);
+               continue;
              }
 
-             /**
-              * Convert an array of little-endian words to a string
-              */
+             parents = vgraph.parentWays(vertex);
 
-             function binl2rstr(input) {
-               var i, output = '',
-                 l = input.length * 32;
-               for (i = 0; i < l; i += 8) {
-                 output += String.fromCharCode((input[i >> 5] >>> (i % 32)) & 0xFF);
+             if (parents.length < 3) {
+               if (vertexIds.indexOf(vertexId) !== -1) {
+                 vertexIds.splice(vertexIds.indexOf(vertexId), 1); // stop checking this one
                }
-               return output;
              }
 
-             /**
-              * Calculate the RIPE-MD160 of an array of little-endian words, and a bit length.
-              */
+             if (parents.length === 2) {
+               // vertex with 2 parents is trivial
+               var a = parents[0];
+               var b = parents[1];
+               var aIsLeaf = a && !a.__via;
+               var bIsLeaf = b && !b.__via;
+               var leaf, survivor;
 
-             function binl(x, len) {
-               var T, j, i, l,
-                 h0 = 0x67452301,
-                 h1 = 0xefcdab89,
-                 h2 = 0x98badcfe,
-                 h3 = 0x10325476,
-                 h4 = 0xc3d2e1f0,
-                 A1, B1, C1, D1, E1,
-                 A2, B2, C2, D2, E2;
-
-               /* append padding */
-               x[len >> 5] |= 0x80 << (len % 32);
-               x[(((len + 64) >>> 9) << 4) + 14] = len;
-               l = x.length;
-
-               for (i = 0; i < l; i += 16) {
-                 A1 = A2 = h0;
-                 B1 = B2 = h1;
-                 C1 = C2 = h2;
-                 D1 = D2 = h3;
-                 E1 = E2 = h4;
-                 for (j = 0; j <= 79; j += 1) {
-                   T = safe_add(A1, rmd160_f(j, B1, C1, D1));
-                   T = safe_add(T, x[i + rmd160_r1[j]]);
-                   T = safe_add(T, rmd160_K1(j));
-                   T = safe_add(bit_rol(T, rmd160_s1[j]), E1);
-                   A1 = E1;
-                   E1 = D1;
-                   D1 = bit_rol(C1, 10);
-                   C1 = B1;
-                   B1 = T;
-                   T = safe_add(A2, rmd160_f(79 - j, B2, C2, D2));
-                   T = safe_add(T, x[i + rmd160_r2[j]]);
-                   T = safe_add(T, rmd160_K2(j));
-                   T = safe_add(bit_rol(T, rmd160_s2[j]), E2);
-                   A2 = E2;
-                   E2 = D2;
-                   D2 = bit_rol(C2, 10);
-                   C2 = B2;
-                   B2 = T;
-                 }
+               if (aIsLeaf && !bIsLeaf) {
+                 leaf = a;
+                 survivor = b;
+               } else if (!aIsLeaf && bIsLeaf) {
+                 leaf = b;
+                 survivor = a;
+               }
+
+               if (leaf && survivor) {
+                 survivor = withMetadata(survivor, vertexIds); // update survivor way
+
+                 vgraph = vgraph.replace(survivor).remove(leaf); // update graph
 
-                 T = safe_add(h1, safe_add(C1, D2));
-                 h1 = safe_add(h2, safe_add(D1, E2));
-                 h2 = safe_add(h3, safe_add(E1, A2));
-                 h3 = safe_add(h4, safe_add(A1, B2));
-                 h4 = safe_add(h0, safe_add(B1, C2));
-                 h0 = T;
+                 removeWayIds.push(leaf.id);
+                 keepGoing = true;
                }
-               return [h0, h1, h2, h3, h4];
              }
 
-             // specific algorithm methods
+             parents = vgraph.parentWays(vertex);
 
-             function rmd160_f(j, x, y, z) {
-               return (0 <= j && j <= 15) ? (x ^ y ^ z) :
-                 (16 <= j && j <= 31) ? (x & y) | (~x & z) :
-                 (32 <= j && j <= 47) ? (x | ~y) ^ z :
-                 (48 <= j && j <= 63) ? (x & z) | (y & ~z) :
-                 (64 <= j && j <= 79) ? x ^ (y | ~z) :
-                 'rmd160_f: j out of range';
-             }
+             if (parents.length < 2) {
+               // vertex is no longer a key vertex
+               if (vertexIds.indexOf(vertexId) !== -1) {
+                 vertexIds.splice(vertexIds.indexOf(vertexId), 1); // stop checking this one
+               }
 
-             function rmd160_K1(j) {
-               return (0 <= j && j <= 15) ? 0x00000000 :
-                 (16 <= j && j <= 31) ? 0x5a827999 :
-                 (32 <= j && j <= 47) ? 0x6ed9eba1 :
-                 (48 <= j && j <= 63) ? 0x8f1bbcdc :
-                 (64 <= j && j <= 79) ? 0xa953fd4e :
-                 'rmd160_K1: j out of range';
+               removeVertexIds.push(vertexId);
+               keepGoing = true;
              }
 
-             function rmd160_K2(j) {
-               return (0 <= j && j <= 15) ? 0x50a28be6 :
-                 (16 <= j && j <= 31) ? 0x5c4dd124 :
-                 (32 <= j && j <= 47) ? 0x6d703ef3 :
-                 (48 <= j && j <= 63) ? 0x7a6d76e9 :
-                 (64 <= j && j <= 79) ? 0x00000000 :
-                 'rmd160_K2: j out of range';
+             if (parents.length < 1) {
+               // vertex is no longer attached to anything
+               vgraph = vgraph.remove(vertex);
              }
            }
-         };
+         } while (keepGoing);
 
-         // exposes Hashes
-         (function(window, undefined$1) {
-           var freeExports = false;
-           {
-             freeExports = exports;
-             if (exports && typeof commonjsGlobal === 'object' && commonjsGlobal && commonjsGlobal === commonjsGlobal.global) {
-               window = commonjsGlobal;
-             }
-           }
+         vertices = vertices.filter(function (vertex) {
+           return removeVertexIds.indexOf(vertex.id) === -1;
+         }).map(function (vertex) {
+           return vgraph.entity(vertex.id);
+         });
+         ways = ways.filter(function (way) {
+           return removeWayIds.indexOf(way.id) === -1;
+         }).map(function (way) {
+           return vgraph.entity(way.id);
+         }); // OK!  Here is our intersection..
+
+         var intersection = {
+           graph: vgraph,
+           actions: actions,
+           vertices: vertices,
+           ways: ways
+         }; // Get all the valid turns through this intersection given a starting way id.
+         // This operates on the virtual graph for everything.
+         //
+         // Basically, walk through all possible paths from starting way,
+         //   honoring the existing turn restrictions as we go (watch out for loops!)
+         //
+         // For each path found, generate and return a `osmTurn` datastructure.
+         //
 
-           if (typeof undefined$1 === 'function' && typeof undefined$1.amd === 'object' && undefined$1.amd) {
-             // define as an anonymous module, so, through path mapping, it can be aliased
-             undefined$1(function() {
-               return Hashes;
-             });
-           } else if (freeExports) {
-             // in Node.js or RingoJS v0.8.0+
-             if ( module && module.exports === freeExports) {
-               module.exports = Hashes;
-             }
-             // in Narwhal or RingoJS v0.7.0-
-             else {
-               freeExports.Hashes = Hashes;
-             }
-           } else {
-             // in a browser or Rhino
-             window.Hashes = Hashes;
-           }
-         }(this));
-       }()); // IIFE
-       });
+         intersection.turns = function (fromWayId, maxViaWay) {
+           if (!fromWayId) return [];
+           if (!maxViaWay) maxViaWay = 0;
+           var vgraph = intersection.graph;
+           var keyVertexIds = intersection.vertices.map(function (v) {
+             return v.id;
+           });
+           var start = vgraph.entity(fromWayId);
+           if (!start || !(start.__from || start.__via)) return []; // maxViaWay=0   from-*-to              (0 vias)
+           // maxViaWay=1   from-*-via-*-to        (1 via max)
+           // maxViaWay=2   from-*-via-*-via-*-to  (2 vias max)
 
-       var immutable = extend$2;
+           var maxPathLength = maxViaWay * 2 + 3;
+           var turns = [];
+           step(start);
+           return turns; // traverse the intersection graph and find all the valid paths
 
-       var hasOwnProperty$3 = Object.prototype.hasOwnProperty;
+           function step(entity, currPath, currRestrictions, matchedRestriction) {
+             currPath = (currPath || []).slice(); // shallow copy
 
-       function extend$2() {
-           var target = {};
+             if (currPath.length >= maxPathLength) return;
+             currPath.push(entity.id);
+             currRestrictions = (currRestrictions || []).slice(); // shallow copy
 
-           for (var i = 0; i < arguments.length; i++) {
-               var source = arguments[i];
+             var i, j;
 
-               for (var key in source) {
-                   if (hasOwnProperty$3.call(source, key)) {
-                       target[key] = source[key];
-                   }
-               }
-           }
+             if (entity.type === 'node') {
+               var parents = vgraph.parentWays(entity);
+               var nextWays = []; // which ways can we step into?
 
-           return target
-       }
+               for (i = 0; i < parents.length; i++) {
+                 var way = parents[i]; // if next way is a oneway incoming to this vertex, skip
 
-       var sha1 = new hashes.SHA1();
+                 if (way.__oneWay && way.nodes[0] !== entity.id) continue; // if we have seen it before (allowing for an initial u-turn), skip
 
-       var ohauth = {};
+                 if (currPath.indexOf(way.id) !== -1 && currPath.length >= 3) continue; // Check all "current" restrictions (where we've already walked the `FROM`)
 
-       ohauth.qsString = function(obj) {
-           return Object.keys(obj).sort().map(function(key) {
-               return ohauth.percentEncode(key) + '=' +
-                   ohauth.percentEncode(obj[key]);
-           }).join('&');
-       };
+                 var restrict = null;
+
+                 for (j = 0; j < currRestrictions.length; j++) {
+                   var restriction = currRestrictions[j];
+                   var f = restriction.memberByRole('from');
+                   var v = restriction.membersByRole('via');
+                   var t = restriction.memberByRole('to');
+                   var isOnly = /^only_/.test(restriction.tags.restriction); // Does the current path match this turn restriction?
+
+                   var matchesFrom = f.id === fromWayId;
+                   var matchesViaTo = false;
+                   var isAlongOnlyPath = false;
+
+                   if (t.id === way.id) {
+                     // match TO
+                     if (v.length === 1 && v[0].type === 'node') {
+                       // match VIA node
+                       matchesViaTo = v[0].id === entity.id && (matchesFrom && currPath.length === 2 || !matchesFrom && currPath.length > 2);
+                     } else {
+                       // match all VIA ways
+                       var pathVias = [];
+
+                       for (k = 2; k < currPath.length; k += 2) {
+                         // k = 2 skips FROM
+                         pathVias.push(currPath[k]); // (path goes way-node-way...)
+                       }
+
+                       var restrictionVias = [];
+
+                       for (k = 0; k < v.length; k++) {
+                         if (v[k].type === 'way') {
+                           restrictionVias.push(v[k].id);
+                         }
+                       }
+
+                       var diff = utilArrayDifference(pathVias, restrictionVias);
+                       matchesViaTo = !diff.length;
+                     }
+                   } else if (isOnly) {
+                     for (k = 0; k < v.length; k++) {
+                       // way doesn't match TO, but is one of the via ways along the path of an "only"
+                       if (v[k].type === 'way' && v[k].id === way.id) {
+                         isAlongOnlyPath = true;
+                         break;
+                       }
+                     }
+                   }
+
+                   if (matchesViaTo) {
+                     if (isOnly) {
+                       restrict = {
+                         id: restriction.id,
+                         direct: matchesFrom,
+                         from: f.id,
+                         only: true,
+                         end: true
+                       };
+                     } else {
+                       restrict = {
+                         id: restriction.id,
+                         direct: matchesFrom,
+                         from: f.id,
+                         no: true,
+                         end: true
+                       };
+                     }
+                   } else {
+                     // indirect - caused by a different nearby restriction
+                     if (isAlongOnlyPath) {
+                       restrict = {
+                         id: restriction.id,
+                         direct: false,
+                         from: f.id,
+                         only: true,
+                         end: false
+                       };
+                     } else if (isOnly) {
+                       restrict = {
+                         id: restriction.id,
+                         direct: false,
+                         from: f.id,
+                         no: true,
+                         end: true
+                       };
+                     }
+                   } // stop looking if we find a "direct" restriction (matching FROM, VIA, TO)
 
-       ohauth.stringQs = function(str) {
-           return str.split('&').filter(function (pair) {
-               return pair !== '';
-           }).reduce(function(obj, pair){
-               var parts = pair.split('=');
-               obj[decodeURIComponent(parts[0])] = (null === parts[1]) ?
-                   '' : decodeURIComponent(parts[1]);
-               return obj;
-           }, {});
-       };
 
-       ohauth.rawxhr = function(method, url, data, headers, callback) {
-           var xhr = new XMLHttpRequest(),
-               twoHundred = /^20\d$/;
-           xhr.onreadystatechange = function() {
-               if (4 === xhr.readyState && 0 !== xhr.status) {
-                   if (twoHundred.test(xhr.status)) callback(null, xhr);
-                   else return callback(xhr, null);
+                   if (restrict && restrict.direct) break;
+                 }
+
+                 nextWays.push({
+                   way: way,
+                   restrict: restrict
+                 });
                }
-           };
-           xhr.onerror = function(e) { return callback(e, null); };
-           xhr.open(method, url, true);
-           for (var h in headers) xhr.setRequestHeader(h, headers[h]);
-           xhr.send(data);
-           return xhr;
-       };
 
-       ohauth.xhr = function(method, url, auth, data, options, callback) {
-           var headers = (options && options.header) || {
-               'Content-Type': 'application/x-www-form-urlencoded'
-           };
-           headers.Authorization = 'OAuth ' + ohauth.authHeader(auth);
-           return ohauth.rawxhr(method, url, data, headers, callback);
-       };
+               nextWays.forEach(function (nextWay) {
+                 step(nextWay.way, currPath, currRestrictions, nextWay.restrict);
+               });
+             } else {
+               // entity.type === 'way'
+               if (currPath.length >= 3) {
+                 // this is a "complete" path..
+                 var turnPath = currPath.slice(); // shallow copy
+                 // an indirect restriction - only include the partial path (starting at FROM)
+
+                 if (matchedRestriction && matchedRestriction.direct === false) {
+                   for (i = 0; i < turnPath.length; i++) {
+                     if (turnPath[i] === matchedRestriction.from) {
+                       turnPath = turnPath.slice(i);
+                       break;
+                     }
+                   }
+                 }
 
-       ohauth.nonce = function() {
-           for (var o = ''; o.length < 6;) {
-               o += '0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz'[Math.floor(Math.random() * 61)];
-           }
-           return o;
-       };
+                 var turn = pathToTurn(turnPath);
 
-       ohauth.authHeader = function(obj) {
-           return Object.keys(obj).sort().map(function(key) {
-               return encodeURIComponent(key) + '="' + encodeURIComponent(obj[key]) + '"';
-           }).join(', ');
-       };
+                 if (turn) {
+                   if (matchedRestriction) {
+                     turn.restrictionID = matchedRestriction.id;
+                     turn.no = matchedRestriction.no;
+                     turn.only = matchedRestriction.only;
+                     turn.direct = matchedRestriction.direct;
+                   }
 
-       ohauth.timestamp = function() { return ~~((+new Date()) / 1000); };
+                   turns.push(osmTurn(turn));
+                 }
 
-       ohauth.percentEncode = function(s) {
-           return encodeURIComponent(s)
-               .replace(/\!/g, '%21').replace(/\'/g, '%27')
-               .replace(/\*/g, '%2A').replace(/\(/g, '%28').replace(/\)/g, '%29');
-       };
+                 if (currPath[0] === currPath[2]) return; // if we made a u-turn - stop here
+               }
 
-       ohauth.baseString = function(method, url, params) {
-           if (params.oauth_signature) delete params.oauth_signature;
-           return [
-               method,
-               ohauth.percentEncode(url),
-               ohauth.percentEncode(ohauth.qsString(params))].join('&');
-       };
+               if (matchedRestriction && matchedRestriction.end) return; // don't advance any further
+               // which nodes can we step into?
 
-       ohauth.signature = function(oauth_secret, token_secret, baseString) {
-           return sha1.b64_hmac(
-               ohauth.percentEncode(oauth_secret) + '&' +
-               ohauth.percentEncode(token_secret),
-               baseString);
-       };
+               var n1 = vgraph.entity(entity.first());
+               var n2 = vgraph.entity(entity.last());
+               var dist = geoSphericalDistance(n1.loc, n2.loc);
+               var nextNodes = [];
 
-       /**
-        * Takes an options object for configuration (consumer_key,
-        * consumer_secret, version, signature_method, token, token_secret)
-        * and returns a function that generates the Authorization header
-        * for given data.
-        *
-        * The returned function takes these parameters:
-        * - method: GET/POST/...
-        * - uri: full URI with protocol, port, path and query string
-        * - extra_params: any extra parameters (that are passed in the POST data),
-        *   can be an object or a from-urlencoded string.
-        *
-        * Returned function returns full OAuth header with "OAuth" string in it.
-        */
+               if (currPath.length > 1) {
+                 if (dist > maxDistance) return; // the next node is too far
 
-       ohauth.headerGenerator = function(options) {
-           options = options || {};
-           var consumer_key = options.consumer_key || '',
-               consumer_secret = options.consumer_secret || '',
-               signature_method = options.signature_method || 'HMAC-SHA1',
-               version = options.version || '1.0',
-               token = options.token || '',
-               token_secret = options.token_secret || '';
+                 if (!entity.__via) return; // this way is a leaf / can't be a via
+               }
 
-           return function(method, uri, extra_params) {
-               method = method.toUpperCase();
-               if (typeof extra_params === 'string' && extra_params.length > 0) {
-                   extra_params = ohauth.stringQs(extra_params);
+               if (!entity.__oneWay && // bidirectional..
+               keyVertexIds.indexOf(n1.id) !== -1 && // key vertex..
+               currPath.indexOf(n1.id) === -1) {
+                 // haven't seen it yet..
+                 nextNodes.push(n1); // can advance to first node
                }
 
-               var uri_parts = uri.split('?', 2),
-               base_uri = uri_parts[0];
+               if (keyVertexIds.indexOf(n2.id) !== -1 && // key vertex..
+               currPath.indexOf(n2.id) === -1) {
+                 // haven't seen it yet..
+                 nextNodes.push(n2); // can advance to last node
+               }
 
-               var query_params = uri_parts.length === 2 ?
-                   ohauth.stringQs(uri_parts[1]) : {};
+               nextNodes.forEach(function (nextNode) {
+                 // gather restrictions FROM this way
+                 var fromRestrictions = vgraph.parentRelations(entity).filter(function (r) {
+                   if (!r.isRestriction()) return false;
+                   var f = r.memberByRole('from');
+                   if (!f || f.id !== entity.id) return false;
+                   var isOnly = /^only_/.test(r.tags.restriction);
+                   if (!isOnly) return true; // `only_` restrictions only matter along the direction of the VIA - #4849
 
-               var oauth_params = {
-                   oauth_consumer_key: consumer_key,
-                   oauth_signature_method: signature_method,
-                   oauth_version: version,
-                   oauth_timestamp: ohauth.timestamp(),
-                   oauth_nonce: ohauth.nonce()
-               };
+                   var isOnlyVia = false;
+                   var v = r.membersByRole('via');
+
+                   if (v.length === 1 && v[0].type === 'node') {
+                     // via node
+                     isOnlyVia = v[0].id === nextNode.id;
+                   } else {
+                     // via way(s)
+                     for (var i = 0; i < v.length; i++) {
+                       if (v[i].type !== 'way') continue;
+                       var viaWay = vgraph.entity(v[i].id);
+
+                       if (viaWay.first() === nextNode.id || viaWay.last() === nextNode.id) {
+                         isOnlyVia = true;
+                         break;
+                       }
+                     }
+                   }
 
-               if (token) oauth_params.oauth_token = token;
+                   return isOnlyVia;
+                 });
+                 step(nextNode, currPath, currRestrictions.concat(fromRestrictions), false);
+               });
+             }
+           } // assumes path is alternating way-node-way of odd length
 
-               var all_params = immutable({}, oauth_params, query_params, extra_params),
-                   base_str = ohauth.baseString(method, base_uri, all_params);
 
-               oauth_params.oauth_signature = ohauth.signature(consumer_secret, token_secret, base_str);
+           function pathToTurn(path) {
+             if (path.length < 3) return;
+             var fromWayId, fromNodeId, fromVertexId;
+             var toWayId, toNodeId, toVertexId;
+             var viaWayIds, viaNodeId, isUturn;
+             fromWayId = path[0];
+             toWayId = path[path.length - 1];
 
-               return 'OAuth ' + ohauth.authHeader(oauth_params);
-           };
-       };
+             if (path.length === 3 && fromWayId === toWayId) {
+               // u turn
+               var way = vgraph.entity(fromWayId);
+               if (way.__oneWay) return null;
+               isUturn = true;
+               viaNodeId = fromVertexId = toVertexId = path[1];
+               fromNodeId = toNodeId = adjacentNode(fromWayId, viaNodeId);
+             } else {
+               isUturn = false;
+               fromVertexId = path[1];
+               fromNodeId = adjacentNode(fromWayId, fromVertexId);
+               toVertexId = path[path.length - 2];
+               toNodeId = adjacentNode(toWayId, toVertexId);
+
+               if (path.length === 3) {
+                 viaNodeId = path[1];
+               } else {
+                 viaWayIds = path.filter(function (entityId) {
+                   return entityId[0] === 'w';
+                 });
+                 viaWayIds = viaWayIds.slice(1, viaWayIds.length - 1); // remove first, last
+               }
+             }
 
-       var ohauth_1 = ohauth;
+             return {
+               key: path.join('_'),
+               path: path,
+               from: {
+                 node: fromNodeId,
+                 way: fromWayId,
+                 vertex: fromVertexId
+               },
+               via: {
+                 node: viaNodeId,
+                 ways: viaWayIds
+               },
+               to: {
+                 node: toNodeId,
+                 way: toWayId,
+                 vertex: toVertexId
+               },
+               u: isUturn
+             };
 
-       var resolveUrl$1 = createCommonjsModule(function (module, exports) {
-       // Copyright 2014 Simon Lydell
-       // X11 (“MIT”) Licensed. (See LICENSE.)
+             function adjacentNode(wayId, affixId) {
+               var nodes = vgraph.entity(wayId).nodes;
+               return affixId === nodes[0] ? nodes[1] : nodes[nodes.length - 2];
+             }
+           }
+         };
 
-       void (function(root, factory) {
-         {
-           module.exports = factory();
+         return intersection;
+       }
+       function osmInferRestriction(graph, turn, projection) {
+         var fromWay = graph.entity(turn.from.way);
+         var fromNode = graph.entity(turn.from.node);
+         var fromVertex = graph.entity(turn.from.vertex);
+         var toWay = graph.entity(turn.to.way);
+         var toNode = graph.entity(turn.to.node);
+         var toVertex = graph.entity(turn.to.vertex);
+         var fromOneWay = fromWay.tags.oneway === 'yes';
+         var toOneWay = toWay.tags.oneway === 'yes';
+         var angle = (geoAngle(fromVertex, fromNode, projection) - geoAngle(toVertex, toNode, projection)) * 180 / Math.PI;
+
+         while (angle < 0) {
+           angle += 360;
          }
-       }(commonjsGlobal, function() {
 
-         function resolveUrl(/* ...urls */) {
-           var numUrls = arguments.length;
+         if (fromNode === toNode) return 'no_u_turn';
+         if ((angle < 23 || angle > 336) && fromOneWay && toOneWay) return 'no_u_turn'; // wider tolerance for u-turn if both ways are oneway
 
-           if (numUrls === 0) {
-             throw new Error("resolveUrl requires at least one argument; got none.")
-           }
+         if ((angle < 40 || angle > 319) && fromOneWay && toOneWay && turn.from.vertex !== turn.to.vertex) return 'no_u_turn'; // even wider tolerance for u-turn if there is a via way (from !== to)
 
-           var base = document.createElement("base");
-           base.href = arguments[0];
+         if (angle < 158) return 'no_right_turn';
+         if (angle > 202) return 'no_left_turn';
+         return 'no_straight_on';
+       }
 
-           if (numUrls === 1) {
-             return base.href
-           }
+       function actionMergePolygon(ids, newRelationId) {
+         function groupEntities(graph) {
+           var entities = ids.map(function (id) {
+             return graph.entity(id);
+           });
+           var geometryGroups = utilArrayGroupBy(entities, function (entity) {
+             if (entity.type === 'way' && entity.isClosed()) {
+               return 'closedWay';
+             } else if (entity.type === 'relation' && entity.isMultipolygon()) {
+               return 'multipolygon';
+             } else {
+               return 'other';
+             }
+           });
+           return Object.assign({
+             closedWay: [],
+             multipolygon: [],
+             other: []
+           }, geometryGroups);
+         }
 
-           var head = document.getElementsByTagName("head")[0];
-           head.insertBefore(base, head.firstChild);
+         var action = function action(graph) {
+           var entities = groupEntities(graph); // An array representing all the polygons that are part of the multipolygon.
+           //
+           // Each element is itself an array of objects with an id property, and has a
+           // locs property which is an array of the locations forming the polygon.
+
+           var polygons = entities.multipolygon.reduce(function (polygons, m) {
+             return polygons.concat(osmJoinWays(m.members, graph));
+           }, []).concat(entities.closedWay.map(function (d) {
+             var member = [{
+               id: d.id
+             }];
+             member.nodes = graph.childNodes(d);
+             return member;
+           })); // contained is an array of arrays of boolean values,
+           // where contained[j][k] is true iff the jth way is
+           // contained by the kth way.
+
+           var contained = polygons.map(function (w, i) {
+             return polygons.map(function (d, n) {
+               if (i === n) return null;
+               return geoPolygonContainsPolygon(d.nodes.map(function (n) {
+                 return n.loc;
+               }), w.nodes.map(function (n) {
+                 return n.loc;
+               }));
+             });
+           }); // Sort all polygons as either outer or inner ways
 
-           var a = document.createElement("a");
-           var resolved;
+           var members = [];
+           var outer = true;
 
-           for (var index = 1; index < numUrls; index++) {
-             a.href = arguments[index];
-             resolved = a.href;
-             base.href = resolved;
+           while (polygons.length) {
+             extractUncontained(polygons);
+             polygons = polygons.filter(isContained);
+             contained = contained.filter(isContained).map(filterContained);
            }
 
-           head.removeChild(base);
+           function isContained(d, i) {
+             return contained[i].some(function (val) {
+               return val;
+             });
+           }
 
-           return resolved
-         }
+           function filterContained(d) {
+             return d.filter(isContained);
+           }
 
-         return resolveUrl
+           function extractUncontained(polygons) {
+             polygons.forEach(function (d, i) {
+               if (!isContained(d, i)) {
+                 d.forEach(function (member) {
+                   members.push({
+                     type: 'way',
+                     id: member.id,
+                     role: outer ? 'outer' : 'inner'
+                   });
+                 });
+               }
+             });
+             outer = !outer;
+           } // Move all tags to one relation
 
-       }));
-       });
 
-       var assign$1 = make_assign();
-       var create$8 = make_create();
-       var trim = make_trim();
-       var Global = (typeof window !== 'undefined' ? window : commonjsGlobal);
+           var relation = entities.multipolygon[0] || osmRelation({
+             id: newRelationId,
+             tags: {
+               type: 'multipolygon'
+             }
+           });
+           entities.multipolygon.slice(1).forEach(function (m) {
+             relation = relation.mergeTags(m.tags);
+             graph = graph.remove(m);
+           });
+           entities.closedWay.forEach(function (way) {
+             function isThisOuter(m) {
+               return m.id === way.id && m.role !== 'inner';
+             }
 
-       var util = {
-               assign: assign$1,
-               create: create$8,
-               trim: trim,
-               bind: bind$3,
-               slice: slice$5,
-               each: each,
-               map: map$5,
-               pluck: pluck,
-               isList: isList,
-               isFunction: isFunction$2,
-               isObject: isObject$2,
-               Global: Global
-       };
+             if (members.some(isThisOuter)) {
+               relation = relation.mergeTags(way.tags);
+               graph = graph.replace(way.update({
+                 tags: {}
+               }));
+             }
+           });
+           return graph.replace(relation.update({
+             members: members,
+             tags: utilObjectOmit(relation.tags, ['area'])
+           }));
+         };
 
-       function make_assign() {
-               if (Object.assign) {
-                       return Object.assign
-               } else {
-                       return function shimAssign(obj, props1, props2, etc) {
-                               for (var i = 1; i < arguments.length; i++) {
-                                       each(Object(arguments[i]), function(val, key) {
-                                               obj[key] = val;
-                                       });
-                               }                       
-                               return obj
-                       }
-               }
-       }
+         action.disabled = function (graph) {
+           var entities = groupEntities(graph);
 
-       function make_create() {
-               if (Object.create) {
-                       return function create(obj, assignProps1, assignProps2, etc) {
-                               var assignArgsList = slice$5(arguments, 1);
-                               return assign$1.apply(this, [Object.create(obj)].concat(assignArgsList))
-                       }
-               } else {
-                       function F() {} // eslint-disable-line no-inner-declarations
-                       return function create(obj, assignProps1, assignProps2, etc) {
-                               var assignArgsList = slice$5(arguments, 1);
-                               F.prototype = obj;
-                               return assign$1.apply(this, [new F()].concat(assignArgsList))
-                       }
-               }
-       }
+           if (entities.other.length > 0 || entities.closedWay.length + entities.multipolygon.length < 2) {
+             return 'not_eligible';
+           }
 
-       function make_trim() {
-               if (String.prototype.trim) {
-                       return function trim(str) {
-                               return String.prototype.trim.call(str)
-                       }
-               } else {
-                       return function trim(str) {
-                               return str.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, '')
-                       }
-               }
-       }
+           if (!entities.multipolygon.every(function (r) {
+             return r.isComplete(graph);
+           })) {
+             return 'incomplete_relation';
+           }
 
-       function bind$3(obj, fn) {
-               return function() {
-                       return fn.apply(obj, Array.prototype.slice.call(arguments, 0))
-               }
-       }
+           if (!entities.multipolygon.length) {
+             var sharedMultipolygons = [];
+             entities.closedWay.forEach(function (way, i) {
+               if (i === 0) {
+                 sharedMultipolygons = graph.parentMultipolygons(way);
+               } else {
+                 sharedMultipolygons = utilArrayIntersection(sharedMultipolygons, graph.parentMultipolygons(way));
+               }
+             });
+             sharedMultipolygons = sharedMultipolygons.filter(function (relation) {
+               return relation.members.length === entities.closedWay.length;
+             });
 
-       function slice$5(arr, index) {
-               return Array.prototype.slice.call(arr, index || 0)
-       }
+             if (sharedMultipolygons.length) {
+               // don't create a new multipolygon if it'd be redundant
+               return 'not_eligible';
+             }
+           } else if (entities.closedWay.some(function (way) {
+             return utilArrayIntersection(graph.parentMultipolygons(way), entities.multipolygon).length;
+           })) {
+             // don't add a way to a multipolygon again if it's already a member
+             return 'not_eligible';
+           }
+         };
 
-       function each(obj, fn) {
-               pluck(obj, function(val, key) {
-                       fn(val, key);
-                       return false
-               });
+         return action;
        }
 
-       function map$5(obj, fn) {
-               var res = (isList(obj) ? [] : {});
-               pluck(obj, function(v, k) {
-                       res[k] = fn(v, k);
-                       return false
-               });
-               return res
-       }
+       var UNSUPPORTED_Y$3 = regexpStickyHelpers.UNSUPPORTED_Y;
 
-       function pluck(obj, fn) {
-               if (isList(obj)) {
-                       for (var i=0; i<obj.length; i++) {
-                               if (fn(obj[i], i)) {
-                                       return obj[i]
-                               }
-                       }
-               } else {
-                       for (var key in obj) {
-                               if (obj.hasOwnProperty(key)) {
-                                       if (fn(obj[key], key)) {
-                                               return obj[key]
-                                       }
-                               }
-                       }
-               }
+       // `RegExp.prototype.flags` getter
+       // https://tc39.github.io/ecma262/#sec-get-regexp.prototype.flags
+       if (descriptors && (/./g.flags != 'g' || UNSUPPORTED_Y$3)) {
+         objectDefineProperty.f(RegExp.prototype, 'flags', {
+           configurable: true,
+           get: regexpFlags
+         });
        }
 
-       function isList(val) {
-               return (val != null && typeof val != 'function' && typeof val.length == 'number')
-       }
+       var fastDeepEqual = function equal(a, b) {
+         if (a === b) return true;
 
-       function isFunction$2(val) {
-               return val && {}.toString.call(val) === '[object Function]'
-       }
+         if (a && b && _typeof(a) == 'object' && _typeof(b) == 'object') {
+           if (a.constructor !== b.constructor) return false;
+           var length, i, keys;
 
-       function isObject$2(val) {
-               return val && {}.toString.call(val) === '[object Object]'
-       }
+           if (Array.isArray(a)) {
+             length = a.length;
+             if (length != b.length) return false;
 
-       var slice$6 = util.slice;
-       var pluck$1 = util.pluck;
-       var each$1 = util.each;
-       var bind$4 = util.bind;
-       var create$9 = util.create;
-       var isList$1 = util.isList;
-       var isFunction$3 = util.isFunction;
-       var isObject$3 = util.isObject;
+             for (i = length; i-- !== 0;) {
+               if (!equal(a[i], b[i])) return false;
+             }
+
+             return true;
+           }
+
+           if (a.constructor === RegExp) return a.source === b.source && a.flags === b.flags;
+           if (a.valueOf !== Object.prototype.valueOf) return a.valueOf() === b.valueOf();
+           if (a.toString !== Object.prototype.toString) return a.toString() === b.toString();
+           keys = Object.keys(a);
+           length = keys.length;
+           if (length !== Object.keys(b).length) return false;
+
+           for (i = length; i-- !== 0;) {
+             if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;
+           }
+
+           for (i = length; i-- !== 0;) {
+             var key = keys[i];
+             if (!equal(a[key], b[key])) return false;
+           }
 
-       var storeEngine = {
-               createStore: createStore
-       };
+           return true;
+         } // true if both NaN, false otherwise
 
-       var storeAPI = {
-               version: '2.0.12',
-               enabled: false,
-               
-               // get returns the value of the given key. If that value
-               // is undefined, it returns optionalDefaultValue instead.
-               get: function(key, optionalDefaultValue) {
-                       var data = this.storage.read(this._namespacePrefix + key);
-                       return this._deserialize(data, optionalDefaultValue)
-               },
-
-               // set will store the given value at key and returns value.
-               // Calling set with value === undefined is equivalent to calling remove.
-               set: function(key, value) {
-                       if (value === undefined) {
-                               return this.remove(key)
-                       }
-                       this.storage.write(this._namespacePrefix + key, this._serialize(value));
-                       return value
-               },
-
-               // remove deletes the key and value stored at the given key.
-               remove: function(key) {
-                       this.storage.remove(this._namespacePrefix + key);
-               },
-
-               // each will call the given callback once for each key-value pair
-               // in this store.
-               each: function(callback) {
-                       var self = this;
-                       this.storage.each(function(val, namespacedKey) {
-                               callback.call(self, self._deserialize(val), (namespacedKey || '').replace(self._namespaceRegexp, ''));
-                       });
-               },
-
-               // clearAll will remove all the stored key-value pairs in this store.
-               clearAll: function() {
-                       this.storage.clearAll();
-               },
-
-               // additional functionality that can't live in plugins
-               // ---------------------------------------------------
-
-               // hasNamespace returns true if this store instance has the given namespace.
-               hasNamespace: function(namespace) {
-                       return (this._namespacePrefix == '__storejs_'+namespace+'_')
-               },
-
-               // createStore creates a store.js instance with the first
-               // functioning storage in the list of storage candidates,
-               // and applies the the given mixins to the instance.
-               createStore: function() {
-                       return createStore.apply(this, arguments)
-               },
-               
-               addPlugin: function(plugin) {
-                       this._addPlugin(plugin);
-               },
-               
-               namespace: function(namespace) {
-                       return createStore(this.storage, this.plugins, namespace)
-               }
+
+         return a !== a && b !== b;
        };
 
-       function _warn() {
-               var _console = (typeof console == 'undefined' ? null : console);
-               if (!_console) { return }
-               var fn = (_console.warn ? _console.warn : _console.log);
-               fn.apply(_console, arguments);
-       }
-
-       function createStore(storages, plugins, namespace) {
-               if (!namespace) {
-                       namespace = '';
-               }
-               if (storages && !isList$1(storages)) {
-                       storages = [storages];
-               }
-               if (plugins && !isList$1(plugins)) {
-                       plugins = [plugins];
-               }
-
-               var namespacePrefix = (namespace ? '__storejs_'+namespace+'_' : '');
-               var namespaceRegexp = (namespace ? new RegExp('^'+namespacePrefix) : null);
-               var legalNamespaces = /^[a-zA-Z0-9_\-]*$/; // alpha-numeric + underscore and dash
-               if (!legalNamespaces.test(namespace)) {
-                       throw new Error('store.js namespaces can only have alphanumerics + underscores and dashes')
-               }
-               
-               var _privateStoreProps = {
-                       _namespacePrefix: namespacePrefix,
-                       _namespaceRegexp: namespaceRegexp,
-
-                       _testStorage: function(storage) {
-                               try {
-                                       var testStr = '__storejs__test__';
-                                       storage.write(testStr, testStr);
-                                       var ok = (storage.read(testStr) === testStr);
-                                       storage.remove(testStr);
-                                       return ok
-                               } catch(e) {
-                                       return false
-                               }
-                       },
-
-                       _assignPluginFnProp: function(pluginFnProp, propName) {
-                               var oldFn = this[propName];
-                               this[propName] = function pluginFn() {
-                                       var args = slice$6(arguments, 0);
-                                       var self = this;
-
-                                       // super_fn calls the old function which was overwritten by
-                                       // this mixin.
-                                       function super_fn() {
-                                               if (!oldFn) { return }
-                                               each$1(arguments, function(arg, i) {
-                                                       args[i] = arg;
-                                               });
-                                               return oldFn.apply(self, args)
-                                       }
-
-                                       // Give mixing function access to super_fn by prefixing all mixin function
-                                       // arguments with super_fn.
-                                       var newFnArgs = [super_fn].concat(args);
-
-                                       return pluginFnProp.apply(self, newFnArgs)
-                               };
-                       },
-
-                       _serialize: function(obj) {
-                               return JSON.stringify(obj)
-                       },
-
-                       _deserialize: function(strVal, defaultVal) {
-                               if (!strVal) { return defaultVal }
-                               // It is possible that a raw string value has been previously stored
-                               // in a storage without using store.js, meaning it will be a raw
-                               // string value instead of a JSON serialized string. By defaulting
-                               // to the raw string value in case of a JSON parse error, we allow
-                               // for past stored values to be forwards-compatible with store.js
-                               var val = '';
-                               try { val = JSON.parse(strVal); }
-                               catch(e) { val = strVal; }
-
-                               return (val !== undefined ? val : defaultVal)
-                       },
-                       
-                       _addStorage: function(storage) {
-                               if (this.enabled) { return }
-                               if (this._testStorage(storage)) {
-                                       this.storage = storage;
-                                       this.enabled = true;
-                               }
-                       },
-
-                       _addPlugin: function(plugin) {
-                               var self = this;
-
-                               // If the plugin is an array, then add all plugins in the array.
-                               // This allows for a plugin to depend on other plugins.
-                               if (isList$1(plugin)) {
-                                       each$1(plugin, function(plugin) {
-                                               self._addPlugin(plugin);
-                                       });
-                                       return
-                               }
-
-                               // Keep track of all plugins we've seen so far, so that we
-                               // don't add any of them twice.
-                               var seenPlugin = pluck$1(this.plugins, function(seenPlugin) {
-                                       return (plugin === seenPlugin)
-                               });
-                               if (seenPlugin) {
-                                       return
-                               }
-                               this.plugins.push(plugin);
-
-                               // Check that the plugin is properly formed
-                               if (!isFunction$3(plugin)) {
-                                       throw new Error('Plugins must be function values that return objects')
-                               }
-
-                               var pluginProperties = plugin.call(this);
-                               if (!isObject$3(pluginProperties)) {
-                                       throw new Error('Plugins must return an object of function properties')
-                               }
-
-                               // Add the plugin function properties to this store instance.
-                               each$1(pluginProperties, function(pluginFnProp, propName) {
-                                       if (!isFunction$3(pluginFnProp)) {
-                                               throw new Error('Bad plugin property: '+propName+' from plugin '+plugin.name+'. Plugins should only return functions.')
-                                       }
-                                       self._assignPluginFnProp(pluginFnProp, propName);
-                               });
-                       },
-                       
-                       // Put deprecated properties in the private API, so as to not expose it to accidential
-                       // discovery through inspection of the store object.
-                       
-                       // Deprecated: addStorage
-                       addStorage: function(storage) {
-                               _warn('store.addStorage(storage) is deprecated. Use createStore([storages])');
-                               this._addStorage(storage);
-                       }
-               };
-
-               var store = create$9(_privateStoreProps, storeAPI, {
-                       plugins: []
-               });
-               store.raw = {};
-               each$1(store, function(prop, propName) {
-                       if (isFunction$3(prop)) {
-                               store.raw[propName] = bind$4(store, prop);                      
-                       }
-               });
-               each$1(storages, function(storage) {
-                       store._addStorage(storage);
-               });
-               each$1(plugins, function(plugin) {
-                       store._addPlugin(plugin);
-               });
-               return store
-       }
+       // J. W. Hunt and M. D. McIlroy, An algorithm for differential buffer
+       // comparison, Bell Telephone Laboratories CSTR #41 (1976)
+       // http://www.cs.dartmouth.edu/~doug/
+       // https://en.wikipedia.org/wiki/Longest_common_subsequence_problem
+       //
+       // Expects two arrays, finds longest common sequence
 
-       var Global$1 = util.Global;
+       function LCS(buffer1, buffer2) {
+         var equivalenceClasses = {};
 
-       var localStorage_1 = {
-               name: 'localStorage',
-               read: read,
-               write: write,
-               each: each$2,
-               remove: remove$2,
-               clearAll: clearAll,
-       };
+         for (var j = 0; j < buffer2.length; j++) {
+           var item = buffer2[j];
 
-       function localStorage$1() {
-               return Global$1.localStorage
-       }
+           if (equivalenceClasses[item]) {
+             equivalenceClasses[item].push(j);
+           } else {
+             equivalenceClasses[item] = [j];
+           }
+         }
 
-       function read(key) {
-               return localStorage$1().getItem(key)
-       }
+         var NULLRESULT = {
+           buffer1index: -1,
+           buffer2index: -1,
+           chain: null
+         };
+         var candidates = [NULLRESULT];
 
-       function write(key, data) {
-               return localStorage$1().setItem(key, data)
-       }
+         for (var i = 0; i < buffer1.length; i++) {
+           var _item = buffer1[i];
+           var buffer2indices = equivalenceClasses[_item] || [];
+           var r = 0;
+           var c = candidates[0];
 
-       function each$2(fn) {
-               for (var i = localStorage$1().length - 1; i >= 0; i--) {
-                       var key = localStorage$1().key(i);
-                       fn(read(key), key);
-               }
-       }
+           for (var jx = 0; jx < buffer2indices.length; jx++) {
+             var _j = buffer2indices[jx];
+             var s = void 0;
 
-       function remove$2(key) {
-               return localStorage$1().removeItem(key)
-       }
+             for (s = r; s < candidates.length; s++) {
+               if (candidates[s].buffer2index < _j && (s === candidates.length - 1 || candidates[s + 1].buffer2index > _j)) {
+                 break;
+               }
+             }
 
-       function clearAll() {
-               return localStorage$1().clear()
-       }
+             if (s < candidates.length) {
+               var newCandidate = {
+                 buffer1index: i,
+                 buffer2index: _j,
+                 chain: candidates[s]
+               };
 
-       // oldFF-globalStorage provides storage for Firefox
-       // versions 6 and 7, where no localStorage, etc
-       // is available.
+               if (r === candidates.length) {
+                 candidates.push(c);
+               } else {
+                 candidates[r] = c;
+               }
 
+               r = s + 1;
+               c = newCandidate;
 
-       var Global$2 = util.Global;
+               if (r === candidates.length) {
+                 break; // no point in examining further (j)s
+               }
+             }
+           }
 
-       var oldFFGlobalStorage = {
-               name: 'oldFF-globalStorage',
-               read: read$1,
-               write: write$1,
-               each: each$3,
-               remove: remove$3,
-               clearAll: clearAll$1,
-       };
+           candidates[r] = c;
+         } // At this point, we know the LCS: it's in the reverse of the
+         // linked-list through .chain of candidates[candidates.length - 1].
 
-       var globalStorage = Global$2.globalStorage;
 
-       function read$1(key) {
-               return globalStorage[key]
-       }
+         return candidates[candidates.length - 1];
+       } // We apply the LCS to build a 'comm'-style picture of the
+       // offsets and lengths of mismatched chunks in the input
+       // buffers. This is used by diff3MergeRegions.
 
-       function write$1(key, data) {
-               globalStorage[key] = data;
-       }
 
-       function each$3(fn) {
-               for (var i = globalStorage.length - 1; i >= 0; i--) {
-                       var key = globalStorage.key(i);
-                       fn(globalStorage[key], key);
-               }
-       }
+       function diffIndices(buffer1, buffer2) {
+         var lcs = LCS(buffer1, buffer2);
+         var result = [];
+         var tail1 = buffer1.length;
+         var tail2 = buffer2.length;
+
+         for (var candidate = lcs; candidate !== null; candidate = candidate.chain) {
+           var mismatchLength1 = tail1 - candidate.buffer1index - 1;
+           var mismatchLength2 = tail2 - candidate.buffer2index - 1;
+           tail1 = candidate.buffer1index;
+           tail2 = candidate.buffer2index;
 
-       function remove$3(key) {
-               return globalStorage.removeItem(key)
-       }
+           if (mismatchLength1 || mismatchLength2) {
+             result.push({
+               buffer1: [tail1 + 1, mismatchLength1],
+               buffer1Content: buffer1.slice(tail1 + 1, tail1 + 1 + mismatchLength1),
+               buffer2: [tail2 + 1, mismatchLength2],
+               buffer2Content: buffer2.slice(tail2 + 1, tail2 + 1 + mismatchLength2)
+             });
+           }
+         }
 
-       function clearAll$1() {
-               each$3(function(key, _) {
-                       delete globalStorage[key];
-               });
-       }
+         result.reverse();
+         return result;
+       } // We apply the LCS to build a JSON representation of a
+       // independently derived from O, returns a fairly complicated
+       // internal representation of merge decisions it's taken. The
+       // interested reader may wish to consult
+       //
+       // Sanjeev Khanna, Keshav Kunal, and Benjamin C. Pierce.
+       // 'A Formal Investigation of ' In Arvind and Prasad,
+       // editors, Foundations of Software Technology and Theoretical
+       // Computer Science (FSTTCS), December 2007.
+       //
+       // (http://www.cis.upenn.edu/~bcpierce/papers/diff3-short.pdf)
+       //
 
-       // oldIE-userDataStorage provides storage for Internet Explorer
-       // versions 6 and 7, where no localStorage, sessionStorage, etc
-       // is available.
 
+       function diff3MergeRegions(a, o, b) {
+         // "hunks" are array subsets where `a` or `b` are different from `o`
+         // https://www.gnu.org/software/diffutils/manual/html_node/diff3-Hunks.html
+         var hunks = [];
 
-       var Global$3 = util.Global;
+         function addHunk(h, ab) {
+           hunks.push({
+             ab: ab,
+             oStart: h.buffer1[0],
+             oLength: h.buffer1[1],
+             // length of o to remove
+             abStart: h.buffer2[0],
+             abLength: h.buffer2[1] // length of a/b to insert
+             // abContent: (ab === 'a' ? a : b).slice(h.buffer2[0], h.buffer2[0] + h.buffer2[1])
 
-       var oldIEUserDataStorage = {
-               name: 'oldIE-userDataStorage',
-               write: write$2,
-               read: read$2,
-               each: each$4,
-               remove: remove$4,
-               clearAll: clearAll$2,
-       };
+           });
+         }
 
-       var storageName = 'storejs';
-       var doc = Global$3.document;
-       var _withStorageEl = _makeIEStorageElFunction();
-       var disable = (Global$3.navigator ? Global$3.navigator.userAgent : '').match(/ (MSIE 8|MSIE 9|MSIE 10)\./); // MSIE 9.x, MSIE 10.x
+         diffIndices(o, a).forEach(function (item) {
+           return addHunk(item, 'a');
+         });
+         diffIndices(o, b).forEach(function (item) {
+           return addHunk(item, 'b');
+         });
+         hunks.sort(function (x, y) {
+           return x.oStart - y.oStart;
+         });
+         var results = [];
+         var currOffset = 0;
 
-       function write$2(unfixedKey, data) {
-               if (disable) { return }
-               var fixedKey = fixKey(unfixedKey);
-               _withStorageEl(function(storageEl) {
-                       storageEl.setAttribute(fixedKey, data);
-                       storageEl.save(storageName);
-               });
-       }
+         function advanceTo(endOffset) {
+           if (endOffset > currOffset) {
+             results.push({
+               stable: true,
+               buffer: 'o',
+               bufferStart: currOffset,
+               bufferLength: endOffset - currOffset,
+               bufferContent: o.slice(currOffset, endOffset)
+             });
+             currOffset = endOffset;
+           }
+         }
 
-       function read$2(unfixedKey) {
-               if (disable) { return }
-               var fixedKey = fixKey(unfixedKey);
-               var res = null;
-               _withStorageEl(function(storageEl) {
-                       res = storageEl.getAttribute(fixedKey);
-               });
-               return res
-       }
+         while (hunks.length) {
+           var hunk = hunks.shift();
+           var regionStart = hunk.oStart;
+           var regionEnd = hunk.oStart + hunk.oLength;
+           var regionHunks = [hunk];
+           advanceTo(regionStart); // Try to pull next overlapping hunk into this region
 
-       function each$4(callback) {
-               _withStorageEl(function(storageEl) {
-                       var attributes = storageEl.XMLDocument.documentElement.attributes;
-                       for (var i=attributes.length-1; i>=0; i--) {
-                               var attr = attributes[i];
-                               callback(storageEl.getAttribute(attr.name), attr.name);
-                       }
-               });
-       }
+           while (hunks.length) {
+             var nextHunk = hunks[0];
+             var nextHunkStart = nextHunk.oStart;
+             if (nextHunkStart > regionEnd) break; // no overlap
 
-       function remove$4(unfixedKey) {
-               var fixedKey = fixKey(unfixedKey);
-               _withStorageEl(function(storageEl) {
-                       storageEl.removeAttribute(fixedKey);
-                       storageEl.save(storageName);
-               });
-       }
+             regionEnd = Math.max(regionEnd, nextHunkStart + nextHunk.oLength);
+             regionHunks.push(hunks.shift());
+           }
 
-       function clearAll$2() {
-               _withStorageEl(function(storageEl) {
-                       var attributes = storageEl.XMLDocument.documentElement.attributes;
-                       storageEl.load(storageName);
-                       for (var i=attributes.length-1; i>=0; i--) {
-                               storageEl.removeAttribute(attributes[i].name);
-                       }
-                       storageEl.save(storageName);
-               });
-       }
+           if (regionHunks.length === 1) {
+             // Only one hunk touches this region, meaning that there is no conflict here.
+             // Either `a` or `b` is inserting into a region of `o` unchanged by the other.
+             if (hunk.abLength > 0) {
+               var buffer = hunk.ab === 'a' ? a : b;
+               results.push({
+                 stable: true,
+                 buffer: hunk.ab,
+                 bufferStart: hunk.abStart,
+                 bufferLength: hunk.abLength,
+                 bufferContent: buffer.slice(hunk.abStart, hunk.abStart + hunk.abLength)
+               });
+             }
+           } else {
+             // A true a/b conflict. Determine the bounds involved from `a`, `o`, and `b`.
+             // Effectively merge all the `a` hunks into one giant hunk, then do the
+             // same for the `b` hunks; then, correct for skew in the regions of `o`
+             // that each side changed, and report appropriate spans for the three sides.
+             var bounds = {
+               a: [a.length, -1, o.length, -1],
+               b: [b.length, -1, o.length, -1]
+             };
 
-       // Helpers
-       //////////
+             while (regionHunks.length) {
+               hunk = regionHunks.shift();
+               var oStart = hunk.oStart;
+               var oEnd = oStart + hunk.oLength;
+               var abStart = hunk.abStart;
+               var abEnd = abStart + hunk.abLength;
+               var _b = bounds[hunk.ab];
+               _b[0] = Math.min(abStart, _b[0]);
+               _b[1] = Math.max(abEnd, _b[1]);
+               _b[2] = Math.min(oStart, _b[2]);
+               _b[3] = Math.max(oEnd, _b[3]);
+             }
+
+             var aStart = bounds.a[0] + (regionStart - bounds.a[2]);
+             var aEnd = bounds.a[1] + (regionEnd - bounds.a[3]);
+             var bStart = bounds.b[0] + (regionStart - bounds.b[2]);
+             var bEnd = bounds.b[1] + (regionEnd - bounds.b[3]);
+             var result = {
+               stable: false,
+               aStart: aStart,
+               aLength: aEnd - aStart,
+               aContent: a.slice(aStart, aEnd),
+               oStart: regionStart,
+               oLength: regionEnd - regionStart,
+               oContent: o.slice(regionStart, regionEnd),
+               bStart: bStart,
+               bLength: bEnd - bStart,
+               bContent: b.slice(bStart, bEnd)
+             };
+             results.push(result);
+           }
 
-       // In IE7, keys cannot start with a digit or contain certain chars.
-       // See https://github.com/marcuswestin/store.js/issues/40
-       // See https://github.com/marcuswestin/store.js/issues/83
-       var forbiddenCharsRegex = new RegExp("[!\"#$%&'()*+,/\\\\:;<=>?@[\\]^`{|}~]", "g");
-       function fixKey(key) {
-               return key.replace(/^\d/, '___$&').replace(forbiddenCharsRegex, '___')
-       }
+           currOffset = regionEnd;
+         }
 
-       function _makeIEStorageElFunction() {
-               if (!doc || !doc.documentElement || !doc.documentElement.addBehavior) {
-                       return null
-               }
-               var scriptTag = 'script',
-                       storageOwner,
-                       storageContainer,
-                       storageEl;
-
-               // Since #userData storage applies only to specific paths, we need to
-               // somehow link our data to a specific path.  We choose /favicon.ico
-               // as a pretty safe option, since all browsers already make a request to
-               // this URL anyway and being a 404 will not hurt us here.  We wrap an
-               // iframe pointing to the favicon in an ActiveXObject(htmlfile) object
-               // (see: http://msdn.microsoft.com/en-us/library/aa752574(v=VS.85).aspx)
-               // since the iframe access rules appear to allow direct access and
-               // manipulation of the document element, even for a 404 page.  This
-               // document can be used instead of the current document (which would
-               // have been limited to the current path) to perform #userData storage.
-               try {
-                       /* global ActiveXObject */
-                       storageContainer = new ActiveXObject('htmlfile');
-                       storageContainer.open();
-                       storageContainer.write('<'+scriptTag+'>document.w=window</'+scriptTag+'><iframe src="/favicon.ico"></iframe>');
-                       storageContainer.close();
-                       storageOwner = storageContainer.w.frames[0].document;
-                       storageEl = storageOwner.createElement('div');
-               } catch(e) {
-                       // somehow ActiveXObject instantiation failed (perhaps some special
-                       // security settings or otherwse), fall back to per-path storage
-                       storageEl = doc.createElement('div');
-                       storageOwner = doc.body;
-               }
-
-               return function(storeFunction) {
-                       var args = [].slice.call(arguments, 0);
-                       args.unshift(storageEl);
-                       // See http://msdn.microsoft.com/en-us/library/ms531081(v=VS.85).aspx
-                       // and http://msdn.microsoft.com/en-us/library/ms531424(v=VS.85).aspx
-                       storageOwner.appendChild(storageEl);
-                       storageEl.addBehavior('#default#userData');
-                       storageEl.load(storageName);
-                       storeFunction.apply(this, args);
-                       storageOwner.removeChild(storageEl);
-                       return
-               }
-       }
-
-       // cookieStorage is useful Safari private browser mode, where localStorage
-       // doesn't work but cookies do. This implementation is adopted from
-       // https://developer.mozilla.org/en-US/docs/Web/API/Storage/LocalStorage
+         advanceTo(o.length);
+         return results;
+       } // Applies the output of diff3MergeRegions to actually
+       // construct the merged buffer; the returned result alternates
+       // between 'ok' and 'conflict' blocks.
+       // A "false conflict" is where `a` and `b` both change the same from `o`
 
 
-       var Global$4 = util.Global;
-       var trim$1 = util.trim;
+       function diff3Merge(a, o, b, options) {
+         var defaults = {
+           excludeFalseConflicts: true,
+           stringSeparator: /\s+/
+         };
+         options = Object.assign(defaults, options);
+         var aString = typeof a === 'string';
+         var oString = typeof o === 'string';
+         var bString = typeof b === 'string';
+         if (aString) a = a.split(options.stringSeparator);
+         if (oString) o = o.split(options.stringSeparator);
+         if (bString) b = b.split(options.stringSeparator);
+         var results = [];
+         var regions = diff3MergeRegions(a, o, b);
+         var okBuffer = [];
 
-       var cookieStorage = {
-               name: 'cookieStorage',
-               read: read$3,
-               write: write$3,
-               each: each$5,
-               remove: remove$5,
-               clearAll: clearAll$3,
-       };
+         function flushOk() {
+           if (okBuffer.length) {
+             results.push({
+               ok: okBuffer
+             });
+           }
 
-       var doc$1 = Global$4.document;
+           okBuffer = [];
+         }
 
-       function read$3(key) {
-               if (!key || !_has(key)) { return null }
-               var regexpStr = "(?:^|.*;\\s*)" +
-                       escape(key).replace(/[\-\.\+\*]/g, "\\$&") +
-                       "\\s*\\=\\s*((?:[^;](?!;))*[^;]?).*";
-               return unescape(doc$1.cookie.replace(new RegExp(regexpStr), "$1"))
-       }
+         function isFalseConflict(a, b) {
+           if (a.length !== b.length) return false;
 
-       function each$5(callback) {
-               var cookies = doc$1.cookie.split(/; ?/g);
-               for (var i = cookies.length - 1; i >= 0; i--) {
-                       if (!trim$1(cookies[i])) {
-                               continue
-                       }
-                       var kvp = cookies[i].split('=');
-                       var key = unescape(kvp[0]);
-                       var val = unescape(kvp[1]);
-                       callback(val, key);
-               }
-       }
+           for (var i = 0; i < a.length; i++) {
+             if (a[i] !== b[i]) return false;
+           }
 
-       function write$3(key, data) {
-               if(!key) { return }
-               doc$1.cookie = escape(key) + "=" + escape(data) + "; expires=Tue, 19 Jan 2038 03:14:07 GMT; path=/";
-       }
+           return true;
+         }
 
-       function remove$5(key) {
-               if (!key || !_has(key)) {
-                       return
-               }
-               doc$1.cookie = escape(key) + "=; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/";
-       }
+         regions.forEach(function (region) {
+           if (region.stable) {
+             var _okBuffer;
 
-       function clearAll$3() {
-               each$5(function(_, key) {
-                       remove$5(key);
-               });
-       }
+             (_okBuffer = okBuffer).push.apply(_okBuffer, _toConsumableArray(region.bufferContent));
+           } else {
+             if (options.excludeFalseConflicts && isFalseConflict(region.aContent, region.bContent)) {
+               var _okBuffer2;
 
-       function _has(key) {
-               return (new RegExp("(?:^|;\\s*)" + escape(key).replace(/[\-\.\+\*]/g, "\\$&") + "\\s*\\=")).test(doc$1.cookie)
+               (_okBuffer2 = okBuffer).push.apply(_okBuffer2, _toConsumableArray(region.aContent));
+             } else {
+               flushOk();
+               results.push({
+                 conflict: {
+                   a: region.aContent,
+                   aIndex: region.aStart,
+                   o: region.oContent,
+                   oIndex: region.oStart,
+                   b: region.bContent,
+                   bIndex: region.bStart
+                 }
+               });
+             }
+           }
+         });
+         flushOk();
+         return results;
        }
 
-       var Global$5 = util.Global;
+       function actionMergeRemoteChanges(id, localGraph, remoteGraph, discardTags, formatUser) {
+         discardTags = discardTags || {};
+         var _option = 'safe'; // 'safe', 'force_local', 'force_remote'
 
-       var sessionStorage_1 = {
-               name: 'sessionStorage',
-               read: read$4,
-               write: write$4,
-               each: each$6,
-               remove: remove$6,
-               clearAll: clearAll$4
-       };
+         var _conflicts = [];
 
-       function sessionStorage() {
-               return Global$5.sessionStorage
-       }
+         function user(d) {
+           return typeof formatUser === 'function' ? formatUser(d) : d;
+         }
 
-       function read$4(key) {
-               return sessionStorage().getItem(key)
-       }
+         function mergeLocation(remote, target) {
+           function pointEqual(a, b) {
+             var epsilon = 1e-6;
+             return Math.abs(a[0] - b[0]) < epsilon && Math.abs(a[1] - b[1]) < epsilon;
+           }
 
-       function write$4(key, data) {
-               return sessionStorage().setItem(key, data)
-       }
+           if (_option === 'force_local' || pointEqual(target.loc, remote.loc)) {
+             return target;
+           }
 
-       function each$6(fn) {
-               for (var i = sessionStorage().length - 1; i >= 0; i--) {
-                       var key = sessionStorage().key(i);
-                       fn(read$4(key), key);
-               }
-       }
+           if (_option === 'force_remote') {
+             return target.update({
+               loc: remote.loc
+             });
+           }
 
-       function remove$6(key) {
-               return sessionStorage().removeItem(key)
-       }
+           _conflicts.push(_t('merge_remote_changes.conflict.location', {
+             user: user(remote.user)
+           }));
 
-       function clearAll$4() {
-               return sessionStorage().clear()
-       }
+           return target;
+         }
 
-       // memoryStorage is a useful last fallback to ensure that the store
-       // is functions (meaning store.get(), store.set(), etc will all function).
-       // However, stored values will not persist when the browser navigates to
-       // a new page or reloads the current page.
+         function mergeNodes(base, remote, target) {
+           if (_option === 'force_local' || fastDeepEqual(target.nodes, remote.nodes)) {
+             return target;
+           }
 
-       var memoryStorage_1 = {
-               name: 'memoryStorage',
-               read: read$5,
-               write: write$5,
-               each: each$7,
-               remove: remove$7,
-               clearAll: clearAll$5,
-       };
+           if (_option === 'force_remote') {
+             return target.update({
+               nodes: remote.nodes
+             });
+           }
 
-       var memoryStorage = {};
+           var ccount = _conflicts.length;
+           var o = base.nodes || [];
+           var a = target.nodes || [];
+           var b = remote.nodes || [];
+           var nodes = [];
+           var hunks = diff3Merge(a, o, b, {
+             excludeFalseConflicts: true
+           });
 
-       function read$5(key) {
-               return memoryStorage[key]
-       }
+           for (var i = 0; i < hunks.length; i++) {
+             var hunk = hunks[i];
 
-       function write$5(key, data) {
-               memoryStorage[key] = data;
-       }
+             if (hunk.ok) {
+               nodes.push.apply(nodes, hunk.ok);
+             } else {
+               // for all conflicts, we can assume c.a !== c.b
+               // because `diff3Merge` called with `true` option to exclude false conflicts..
+               var c = hunk.conflict;
+
+               if (fastDeepEqual(c.o, c.a)) {
+                 // only changed remotely
+                 nodes.push.apply(nodes, c.b);
+               } else if (fastDeepEqual(c.o, c.b)) {
+                 // only changed locally
+                 nodes.push.apply(nodes, c.a);
+               } else {
+                 // changed both locally and remotely
+                 _conflicts.push(_t('merge_remote_changes.conflict.nodelist', {
+                   user: user(remote.user)
+                 }));
 
-       function each$7(callback) {
-               for (var key in memoryStorage) {
-                       if (memoryStorage.hasOwnProperty(key)) {
-                               callback(memoryStorage[key], key);
-                       }
-               }
-       }
+                 break;
+               }
+             }
+           }
 
-       function remove$7(key) {
-               delete memoryStorage[key];
-       }
+           return _conflicts.length === ccount ? target.update({
+             nodes: nodes
+           }) : target;
+         }
 
-       function clearAll$5(key) {
-               memoryStorage = {};
-       }
+         function mergeChildren(targetWay, children, updates, graph) {
+           function isUsed(node, targetWay) {
+             var hasInterestingParent = graph.parentWays(node).some(function (way) {
+               return way.id !== targetWay.id;
+             });
+             return node.hasInterestingTags() || hasInterestingParent || graph.parentRelations(node).length > 0;
+           }
 
-       var all = [
-               // Listed in order of usage preference
-               localStorage_1,
-               oldFFGlobalStorage,
-               oldIEUserDataStorage,
-               cookieStorage,
-               sessionStorage_1,
-               memoryStorage_1
-       ];
+           var ccount = _conflicts.length;
 
-       /* eslint-disable */
+           for (var i = 0; i < children.length; i++) {
+             var id = children[i];
+             var node = graph.hasEntity(id); // remove unused childNodes..
 
-       //  json2.js
-       //  2016-10-28
-       //  Public Domain.
-       //  NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
-       //  See http://www.JSON.org/js.html
-       //  This code should be minified before deployment.
-       //  See http://javascript.crockford.com/jsmin.html
+             if (targetWay.nodes.indexOf(id) === -1) {
+               if (node && !isUsed(node, targetWay)) {
+                 updates.removeIds.push(id);
+               }
 
-       //  USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
-       //  NOT CONTROL.
+               continue;
+             } // restore used childNodes..
 
-       //  This file creates a global JSON object containing two methods: stringify
-       //  and parse. This file provides the ES5 JSON capability to ES3 systems.
-       //  If a project might run on IE8 or earlier, then this file should be included.
-       //  This file does nothing on ES5 systems.
 
-       //      JSON.stringify(value, replacer, space)
-       //          value       any JavaScript value, usually an object or array.
-       //          replacer    an optional parameter that determines how object
-       //                      values are stringified for objects. It can be a
-       //                      function or an array of strings.
-       //          space       an optional parameter that specifies the indentation
-       //                      of nested structures. If it is omitted, the text will
-       //                      be packed without extra whitespace. If it is a number,
-       //                      it will specify the number of spaces to indent at each
-       //                      level. If it is a string (such as "\t" or "&nbsp;"),
-       //                      it contains the characters used to indent at each level.
-       //          This method produces a JSON text from a JavaScript value.
-       //          When an object value is found, if the object contains a toJSON
-       //          method, its toJSON method will be called and the result will be
-       //          stringified. A toJSON method does not serialize: it returns the
-       //          value represented by the name/value pair that should be serialized,
-       //          or undefined if nothing should be serialized. The toJSON method
-       //          will be passed the key associated with the value, and this will be
-       //          bound to the value.
+             var local = localGraph.hasEntity(id);
+             var remote = remoteGraph.hasEntity(id);
+             var target;
 
-       //          For example, this would serialize Dates as ISO strings.
+             if (_option === 'force_remote' && remote && remote.visible) {
+               updates.replacements.push(remote);
+             } else if (_option === 'force_local' && local) {
+               target = osmEntity(local);
 
-       //              Date.prototype.toJSON = function (key) {
-       //                  function f(n) {
-       //                      // Format integers to have at least two digits.
-       //                      return (n < 10)
-       //                          ? "0" + n
-       //                          : n;
-       //                  }
-       //                  return this.getUTCFullYear()   + "-" +
-       //                       f(this.getUTCMonth() + 1) + "-" +
-       //                       f(this.getUTCDate())      + "T" +
-       //                       f(this.getUTCHours())     + ":" +
-       //                       f(this.getUTCMinutes())   + ":" +
-       //                       f(this.getUTCSeconds())   + "Z";
-       //              };
+               if (remote) {
+                 target = target.update({
+                   version: remote.version
+                 });
+               }
 
-       //          You can provide an optional replacer method. It will be passed the
-       //          key and value of each member, with this bound to the containing
-       //          object. The value that is returned from your method will be
-       //          serialized. If your method returns undefined, then the member will
-       //          be excluded from the serialization.
+               updates.replacements.push(target);
+             } else if (_option === 'safe' && local && remote && local.version !== remote.version) {
+               target = osmEntity(local, {
+                 version: remote.version
+               });
 
-       //          If the replacer parameter is an array of strings, then it will be
-       //          used to select the members to be serialized. It filters the results
-       //          such that only members with keys listed in the replacer array are
-       //          stringified.
+               if (remote.visible) {
+                 target = mergeLocation(remote, target);
+               } else {
+                 _conflicts.push(_t('merge_remote_changes.conflict.deleted', {
+                   user: user(remote.user)
+                 }));
+               }
 
-       //          Values that do not have JSON representations, such as undefined or
-       //          functions, will not be serialized. Such values in objects will be
-       //          dropped; in arrays they will be replaced with null. You can use
-       //          a replacer function to replace those with JSON values.
+               if (_conflicts.length !== ccount) break;
+               updates.replacements.push(target);
+             }
+           }
 
-       //          JSON.stringify(undefined) returns undefined.
+           return targetWay;
+         }
 
-       //          The optional space parameter produces a stringification of the
-       //          value that is filled with line breaks and indentation to make it
-       //          easier to read.
+         function updateChildren(updates, graph) {
+           for (var i = 0; i < updates.replacements.length; i++) {
+             graph = graph.replace(updates.replacements[i]);
+           }
 
-       //          If the space parameter is a non-empty string, then that string will
-       //          be used for indentation. If the space parameter is a number, then
-       //          the indentation will be that many spaces.
+           if (updates.removeIds.length) {
+             graph = actionDeleteMultiple(updates.removeIds)(graph);
+           }
 
-       //          Example:
+           return graph;
+         }
 
-       //          text = JSON.stringify(["e", {pluribus: "unum"}]);
-       //          // text is '["e",{"pluribus":"unum"}]'
+         function mergeMembers(remote, target) {
+           if (_option === 'force_local' || fastDeepEqual(target.members, remote.members)) {
+             return target;
+           }
 
-       //          text = JSON.stringify(["e", {pluribus: "unum"}], null, "\t");
-       //          // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
+           if (_option === 'force_remote') {
+             return target.update({
+               members: remote.members
+             });
+           }
 
-       //          text = JSON.stringify([new Date()], function (key, value) {
-       //              return this[key] instanceof Date
-       //                  ? "Date(" + this[key] + ")"
-       //                  : value;
-       //          });
-       //          // text is '["Date(---current time---)"]'
+           _conflicts.push(_t('merge_remote_changes.conflict.memberlist', {
+             user: user(remote.user)
+           }));
 
-       //      JSON.parse(text, reviver)
-       //          This method parses a JSON text to produce an object or array.
-       //          It can throw a SyntaxError exception.
+           return target;
+         }
 
-       //          The optional reviver parameter is a function that can filter and
-       //          transform the results. It receives each of the keys and values,
-       //          and its return value is used instead of the original value.
-       //          If it returns what it received, then the structure is not modified.
-       //          If it returns undefined then the member is deleted.
+         function mergeTags(base, remote, target) {
+           if (_option === 'force_local' || fastDeepEqual(target.tags, remote.tags)) {
+             return target;
+           }
 
-       //          Example:
+           if (_option === 'force_remote') {
+             return target.update({
+               tags: remote.tags
+             });
+           }
 
-       //          // Parse the text. Values that look like ISO date strings will
-       //          // be converted to Date objects.
+           var ccount = _conflicts.length;
+           var o = base.tags || {};
+           var a = target.tags || {};
+           var b = remote.tags || {};
+           var keys = utilArrayUnion(utilArrayUnion(Object.keys(o), Object.keys(a)), Object.keys(b)).filter(function (k) {
+             return !discardTags[k];
+           });
+           var tags = Object.assign({}, a); // shallow copy
+
+           var changed = false;
+
+           for (var i = 0; i < keys.length; i++) {
+             var k = keys[i];
+
+             if (o[k] !== b[k] && a[k] !== b[k]) {
+               // changed remotely..
+               if (o[k] !== a[k]) {
+                 // changed locally..
+                 _conflicts.push(_t('merge_remote_changes.conflict.tags', {
+                   tag: k,
+                   local: a[k],
+                   remote: b[k],
+                   user: user(remote.user)
+                 }));
+               } else {
+                 // unchanged locally, accept remote change..
+                 if (b.hasOwnProperty(k)) {
+                   tags[k] = b[k];
+                 } else {
+                   delete tags[k];
+                 }
 
-       //          myData = JSON.parse(text, function (key, value) {
-       //              var a;
-       //              if (typeof value === "string") {
-       //                  a =
-       //   /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
-       //                  if (a) {
-       //                      return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
-       //                          +a[5], +a[6]));
-       //                  }
-       //              }
-       //              return value;
-       //          });
+                 changed = true;
+               }
+             }
+           }
 
-       //          myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) {
-       //              var d;
-       //              if (typeof value === "string" &&
-       //                      value.slice(0, 5) === "Date(" &&
-       //                      value.slice(-1) === ")") {
-       //                  d = new Date(value.slice(5, -1));
-       //                  if (d) {
-       //                      return d;
-       //                  }
-       //              }
-       //              return value;
-       //          });
+           return changed && _conflicts.length === ccount ? target.update({
+             tags: tags
+           }) : target;
+         } //  `graph.base()` is the common ancestor of the two graphs.
+         //  `localGraph` contains user's edits up to saving
+         //  `remoteGraph` contains remote edits to modified nodes
+         //  `graph` must be a descendent of `localGraph` and may include
+         //      some conflict resolution actions performed on it.
+         //
+         //                  --- ... --- `localGraph` -- ... -- `graph`
+         //                 /
+         //  `graph.base()` --- ... --- `remoteGraph`
+         //
 
-       //  This is a reference implementation. You are free to copy, modify, or
-       //  redistribute.
 
-       /*jslint
-           eval, for, this
-       */
+         var action = function action(graph) {
+           var updates = {
+             replacements: [],
+             removeIds: []
+           };
+           var base = graph.base().entities[id];
+           var local = localGraph.entity(id);
+           var remote = remoteGraph.entity(id);
+           var target = osmEntity(local, {
+             version: remote.version
+           }); // delete/undelete
 
-       /*property
-           JSON, apply, call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
-           getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
-           lastIndex, length, parse, prototype, push, replace, slice, stringify,
-           test, toJSON, toString, valueOf
-       */
+           if (!remote.visible) {
+             if (_option === 'force_remote') {
+               return actionDeleteMultiple([id])(graph);
+             } else if (_option === 'force_local') {
+               if (target.type === 'way') {
+                 target = mergeChildren(target, utilArrayUniq(local.nodes), updates, graph);
+                 graph = updateChildren(updates, graph);
+               }
 
+               return graph.replace(target);
+             } else {
+               _conflicts.push(_t('merge_remote_changes.conflict.deleted', {
+                 user: user(remote.user)
+               }));
 
-       // Create a JSON object only if one does not already exist. We create the
-       // methods in a closure to avoid creating global variables.
+               return graph; // do nothing
+             }
+           } // merge
 
-       if (typeof JSON !== "object") {
-           JSON = {};
-       }
 
-       (function () {
+           if (target.type === 'node') {
+             target = mergeLocation(remote, target);
+           } else if (target.type === 'way') {
+             // pull in any child nodes that may not be present locally..
+             graph.rebase(remoteGraph.childNodes(remote), [graph], false);
+             target = mergeNodes(base, remote, target);
+             target = mergeChildren(target, utilArrayUnion(local.nodes, remote.nodes), updates, graph);
+           } else if (target.type === 'relation') {
+             target = mergeMembers(remote, target);
+           }
 
-           var rx_one = /^[\],:{}\s]*$/;
-           var rx_two = /\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g;
-           var rx_three = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g;
-           var rx_four = /(?:^|:|,)(?:\s*\[)+/g;
-           var rx_escapable = /[\\"\u0000-\u001f\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
-           var rx_dangerous = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
+           target = mergeTags(base, remote, target);
 
-           function f(n) {
-               // Format integers to have at least two digits.
-               return n < 10
-                   ? "0" + n
-                   : n;
+           if (!_conflicts.length) {
+             graph = updateChildren(updates, graph).replace(target);
            }
 
-           function this_value() {
-               return this.valueOf();
-           }
+           return graph;
+         };
+
+         action.withOption = function (opt) {
+           _option = opt;
+           return action;
+         };
 
-           if (typeof Date.prototype.toJSON !== "function") {
+         action.conflicts = function () {
+           return _conflicts;
+         };
 
-               Date.prototype.toJSON = function () {
+         return action;
+       }
 
-                   return isFinite(this.valueOf())
-                       ? this.getUTCFullYear() + "-" +
-                               f(this.getUTCMonth() + 1) + "-" +
-                               f(this.getUTCDate()) + "T" +
-                               f(this.getUTCHours()) + ":" +
-                               f(this.getUTCMinutes()) + ":" +
-                               f(this.getUTCSeconds()) + "Z"
-                       : null;
-               };
+       // https://github.com/openstreetmap/potlatch2/blob/master/net/systemeD/halcyon/connection/actions/MoveNodeAction.as
 
-               Boolean.prototype.toJSON = this_value;
-               Number.prototype.toJSON = this_value;
-               String.prototype.toJSON = this_value;
-           }
+       function actionMove(moveIDs, tryDelta, projection, cache) {
+         var _delta = tryDelta;
 
-           var gap;
-           var indent;
-           var meta;
-           var rep;
+         function setupCache(graph) {
+           function canMove(nodeID) {
+             // Allow movement of any node that is in the selectedIDs list..
+             if (moveIDs.indexOf(nodeID) !== -1) return true; // Allow movement of a vertex where 2 ways meet..
 
+             var parents = graph.parentWays(graph.entity(nodeID));
+             if (parents.length < 3) return true; // Restrict movement of a vertex where >2 ways meet, unless all parentWays are moving too..
 
-           function quote(string) {
+             var parentsMoving = parents.every(function (way) {
+               return cache.moving[way.id];
+             });
+             if (!parentsMoving) delete cache.moving[nodeID];
+             return parentsMoving;
+           }
 
-       // If the string contains no control characters, no quote characters, and no
-       // backslash characters, then we can safely slap some quotes around it.
-       // Otherwise we must also replace the offending characters with safe escape
-       // sequences.
+           function cacheEntities(ids) {
+             for (var i = 0; i < ids.length; i++) {
+               var id = ids[i];
+               if (cache.moving[id]) continue;
+               cache.moving[id] = true;
+               var entity = graph.hasEntity(id);
+               if (!entity) continue;
 
-               rx_escapable.lastIndex = 0;
-               return rx_escapable.test(string)
-                   ? "\"" + string.replace(rx_escapable, function (a) {
-                       var c = meta[a];
-                       return typeof c === "string"
-                           ? c
-                           : "\\u" + ("0000" + a.charCodeAt(0).toString(16)).slice(-4);
-                   }) + "\""
-                   : "\"" + string + "\"";
+               if (entity.type === 'node') {
+                 cache.nodes.push(id);
+                 cache.startLoc[id] = entity.loc;
+               } else if (entity.type === 'way') {
+                 cache.ways.push(id);
+                 cacheEntities(entity.nodes);
+               } else {
+                 cacheEntities(entity.members.map(function (member) {
+                   return member.id;
+                 }));
+               }
+             }
            }
 
+           function cacheIntersections(ids) {
+             function isEndpoint(way, id) {
+               return !way.isClosed() && !!way.affix(id);
+             }
 
-           function str(key, holder) {
+             for (var i = 0; i < ids.length; i++) {
+               var id = ids[i]; // consider only intersections with 1 moved and 1 unmoved way.
 
-       // Produce a string from holder[key].
+               var childNodes = graph.childNodes(graph.entity(id));
 
-               var i;          // The loop counter.
-               var k;          // The member key.
-               var v;          // The member value.
-               var length;
-               var mind = gap;
-               var partial;
-               var value = holder[key];
+               for (var j = 0; j < childNodes.length; j++) {
+                 var node = childNodes[j];
+                 var parents = graph.parentWays(node);
+                 if (parents.length !== 2) continue;
+                 var moved = graph.entity(id);
+                 var unmoved = null;
 
-       // If the value has a toJSON method, call it to obtain a replacement value.
+                 for (var k = 0; k < parents.length; k++) {
+                   var way = parents[k];
 
-               if (value && typeof value === "object" &&
-                       typeof value.toJSON === "function") {
-                   value = value.toJSON(key);
-               }
+                   if (!cache.moving[way.id]) {
+                     unmoved = way;
+                     break;
+                   }
+                 }
 
-       // If we were called with a replacer function, then call the replacer to
-       // obtain a replacement value.
+                 if (!unmoved) continue; // exclude ways that are overly connected..
 
-               if (typeof rep === "function") {
-                   value = rep.call(holder, key, value);
+                 if (utilArrayIntersection(moved.nodes, unmoved.nodes).length > 2) continue;
+                 if (moved.isArea() || unmoved.isArea()) continue;
+                 cache.intersections.push({
+                   nodeId: node.id,
+                   movedId: moved.id,
+                   unmovedId: unmoved.id,
+                   movedIsEP: isEndpoint(moved, node.id),
+                   unmovedIsEP: isEndpoint(unmoved, node.id)
+                 });
                }
+             }
+           }
 
-       // What happens next depends on the value's type.
+           if (!cache) {
+             cache = {};
+           }
 
-               switch (typeof value) {
-               case "string":
-                   return quote(value);
+           if (!cache.ok) {
+             cache.moving = {};
+             cache.intersections = [];
+             cache.replacedVertex = {};
+             cache.startLoc = {};
+             cache.nodes = [];
+             cache.ways = [];
+             cacheEntities(moveIDs);
+             cacheIntersections(cache.ways);
+             cache.nodes = cache.nodes.filter(canMove);
+             cache.ok = true;
+           }
+         } // Place a vertex where the moved vertex used to be, to preserve way shape..
+         //
+         //  Start:
+         //      b ---- e
+         //     / \
+         //    /   \
+         //   /     \
+         //  a       c
+         //
+         //      *               node '*' added to preserve shape
+         //     / \
+         //    /   b ---- e      way `b,e` moved here:
+         //   /     \
+         //  a       c
+         //
+         //
 
-               case "number":
 
-       // JSON numbers must be finite. Encode non-finite numbers as null.
+         function replaceMovedVertex(nodeId, wayId, graph, delta) {
+           var way = graph.entity(wayId);
+           var moved = graph.entity(nodeId);
+           var movedIndex = way.nodes.indexOf(nodeId);
+           var len, prevIndex, nextIndex;
 
-                   return isFinite(value)
-                       ? String(value)
-                       : "null";
+           if (way.isClosed()) {
+             len = way.nodes.length - 1;
+             prevIndex = (movedIndex + len - 1) % len;
+             nextIndex = (movedIndex + len + 1) % len;
+           } else {
+             len = way.nodes.length;
+             prevIndex = movedIndex - 1;
+             nextIndex = movedIndex + 1;
+           }
 
-               case "boolean":
-               case "null":
+           var prev = graph.hasEntity(way.nodes[prevIndex]);
+           var next = graph.hasEntity(way.nodes[nextIndex]); // Don't add orig vertex at endpoint..
 
-       // If the value is a boolean or null, convert it to a string. Note:
-       // typeof null does not produce "null". The case is included here in
-       // the remote chance that this gets fixed someday.
+           if (!prev || !next) return graph;
+           var key = wayId + '_' + nodeId;
+           var orig = cache.replacedVertex[key];
 
-                   return String(value);
+           if (!orig) {
+             orig = osmNode();
+             cache.replacedVertex[key] = orig;
+             cache.startLoc[orig.id] = cache.startLoc[nodeId];
+           }
 
-       // If the type is "object", we might be dealing with an object or an array or
-       // null.
+           var start, end;
 
-               case "object":
+           if (delta) {
+             start = projection(cache.startLoc[nodeId]);
+             end = projection.invert(geoVecAdd(start, delta));
+           } else {
+             end = cache.startLoc[nodeId];
+           }
 
-       // Due to a specification blunder in ECMAScript, typeof null is "object",
-       // so watch out for that case.
+           orig = orig.move(end);
+           var angle = Math.abs(geoAngle(orig, prev, projection) - geoAngle(orig, next, projection)) * 180 / Math.PI; // Don't add orig vertex if it would just make a straight line..
 
-                   if (!value) {
-                       return "null";
-                   }
+           if (angle > 175 && angle < 185) return graph; // moving forward or backward along way?
 
-       // Make an array to hold the partial results of stringifying this object value.
+           var p1 = [prev.loc, orig.loc, moved.loc, next.loc].map(projection);
+           var p2 = [prev.loc, moved.loc, orig.loc, next.loc].map(projection);
+           var d1 = geoPathLength(p1);
+           var d2 = geoPathLength(p2);
+           var insertAt = d1 <= d2 ? movedIndex : nextIndex; // moving around closed loop?
 
-                   gap += indent;
-                   partial = [];
+           if (way.isClosed() && insertAt === 0) insertAt = len;
+           way = way.addNode(orig.id, insertAt);
+           return graph.replace(orig).replace(way);
+         } // Remove duplicate vertex that might have been added by
+         // replaceMovedVertex.  This is done after the unzorro checks.
 
-       // Is the value an array?
 
-                   if (Object.prototype.toString.apply(value) === "[object Array]") {
+         function removeDuplicateVertices(wayId, graph) {
+           var way = graph.entity(wayId);
+           var epsilon = 1e-6;
+           var prev, curr;
 
-       // The value is an array. Stringify every element. Use null as a placeholder
-       // for non-JSON values.
+           function isInteresting(node, graph) {
+             return graph.parentWays(node).length > 1 || graph.parentRelations(node).length || node.hasInterestingTags();
+           }
 
-                       length = value.length;
-                       for (i = 0; i < length; i += 1) {
-                           partial[i] = str(i, value) || "null";
-                       }
+           for (var i = 0; i < way.nodes.length; i++) {
+             curr = graph.entity(way.nodes[i]);
 
-       // Join all of the elements together, separated with commas, and wrap them in
-       // brackets.
+             if (prev && curr && geoVecEqual(prev.loc, curr.loc, epsilon)) {
+               if (!isInteresting(prev, graph)) {
+                 way = way.removeNode(prev.id);
+                 graph = graph.replace(way).remove(prev);
+               } else if (!isInteresting(curr, graph)) {
+                 way = way.removeNode(curr.id);
+                 graph = graph.replace(way).remove(curr);
+               }
+             }
 
-                       v = partial.length === 0
-                           ? "[]"
-                           : gap
-                               ? "[\n" + gap + partial.join(",\n" + gap) + "\n" + mind + "]"
-                               : "[" + partial.join(",") + "]";
-                       gap = mind;
-                       return v;
-                   }
+             prev = curr;
+           }
 
-       // If the replacer is an array, use it to select the members to be stringified.
-
-                   if (rep && typeof rep === "object") {
-                       length = rep.length;
-                       for (i = 0; i < length; i += 1) {
-                           if (typeof rep[i] === "string") {
-                               k = rep[i];
-                               v = str(k, value);
-                               if (v) {
-                                   partial.push(quote(k) + (
-                                       gap
-                                           ? ": "
-                                           : ":"
-                                   ) + v);
-                               }
-                           }
-                       }
-                   } else {
+           return graph;
+         } // Reorder nodes around intersections that have moved..
+         //
+         //  Start:                way1.nodes: b,e         (moving)
+         //  a - b - c ----- d     way2.nodes: a,b,c,d     (static)
+         //      |                 vertex: b
+         //      e                 isEP1: true,  isEP2, false
+         //
+         //  way1 `b,e` moved here:
+         //  a ----- c = b - d
+         //              |
+         //              e
+         //
+         //  reorder nodes         way1.nodes: b,e
+         //  a ----- c - b - d     way2.nodes: a,c,b,d
+         //              |
+         //              e
+         //
 
-       // Otherwise, iterate through all of the keys in the object.
-
-                       for (k in value) {
-                           if (Object.prototype.hasOwnProperty.call(value, k)) {
-                               v = str(k, value);
-                               if (v) {
-                                   partial.push(quote(k) + (
-                                       gap
-                                           ? ": "
-                                           : ":"
-                                   ) + v);
-                               }
-                           }
-                       }
-                   }
 
-       // Join all of the member texts together, separated with commas,
-       // and wrap them in braces.
+         function unZorroIntersection(intersection, graph) {
+           var vertex = graph.entity(intersection.nodeId);
+           var way1 = graph.entity(intersection.movedId);
+           var way2 = graph.entity(intersection.unmovedId);
+           var isEP1 = intersection.movedIsEP;
+           var isEP2 = intersection.unmovedIsEP; // don't move the vertex if it is the endpoint of both ways.
 
-                   v = partial.length === 0
-                       ? "{}"
-                       : gap
-                           ? "{\n" + gap + partial.join(",\n" + gap) + "\n" + mind + "}"
-                           : "{" + partial.join(",") + "}";
-                   gap = mind;
-                   return v;
-               }
+           if (isEP1 && isEP2) return graph;
+           var nodes1 = graph.childNodes(way1).filter(function (n) {
+             return n !== vertex;
+           });
+           var nodes2 = graph.childNodes(way2).filter(function (n) {
+             return n !== vertex;
+           });
+           if (way1.isClosed() && way1.first() === vertex.id) nodes1.push(nodes1[0]);
+           if (way2.isClosed() && way2.first() === vertex.id) nodes2.push(nodes2[0]);
+           var edge1 = !isEP1 && geoChooseEdge(nodes1, projection(vertex.loc), projection);
+           var edge2 = !isEP2 && geoChooseEdge(nodes2, projection(vertex.loc), projection);
+           var loc; // snap vertex to nearest edge (or some point between them)..
+
+           if (!isEP1 && !isEP2) {
+             var epsilon = 1e-6,
+                 maxIter = 10;
+
+             for (var i = 0; i < maxIter; i++) {
+               loc = geoVecInterp(edge1.loc, edge2.loc, 0.5);
+               edge1 = geoChooseEdge(nodes1, projection(loc), projection);
+               edge2 = geoChooseEdge(nodes2, projection(loc), projection);
+               if (Math.abs(edge1.distance - edge2.distance) < epsilon) break;
+             }
+           } else if (!isEP1) {
+             loc = edge1.loc;
+           } else {
+             loc = edge2.loc;
            }
 
-       // If the JSON object does not yet have a stringify method, give it one.
+           graph = graph.replace(vertex.move(loc)); // if zorro happened, reorder nodes..
 
-           if (typeof JSON.stringify !== "function") {
-               meta = {    // table of character substitutions
-                   "\b": "\\b",
-                   "\t": "\\t",
-                   "\n": "\\n",
-                   "\f": "\\f",
-                   "\r": "\\r",
-                   "\"": "\\\"",
-                   "\\": "\\\\"
-               };
-               JSON.stringify = function (value, replacer, space) {
+           if (!isEP1 && edge1.index !== way1.nodes.indexOf(vertex.id)) {
+             way1 = way1.removeNode(vertex.id).addNode(vertex.id, edge1.index);
+             graph = graph.replace(way1);
+           }
 
-       // The stringify method takes a value and an optional replacer, and an optional
-       // space parameter, and returns a JSON text. The replacer can be a function
-       // that can replace values, or an array of strings that will select the keys.
-       // A default replacer method can be provided. Use of the space parameter can
-       // produce text that is more easily readable.
+           if (!isEP2 && edge2.index !== way2.nodes.indexOf(vertex.id)) {
+             way2 = way2.removeNode(vertex.id).addNode(vertex.id, edge2.index);
+             graph = graph.replace(way2);
+           }
 
-                   var i;
-                   gap = "";
-                   indent = "";
+           return graph;
+         }
 
-       // If the space parameter is a number, make an indent string containing that
-       // many spaces.
+         function cleanupIntersections(graph) {
+           for (var i = 0; i < cache.intersections.length; i++) {
+             var obj = cache.intersections[i];
+             graph = replaceMovedVertex(obj.nodeId, obj.movedId, graph, _delta);
+             graph = replaceMovedVertex(obj.nodeId, obj.unmovedId, graph, null);
+             graph = unZorroIntersection(obj, graph);
+             graph = removeDuplicateVertices(obj.movedId, graph);
+             graph = removeDuplicateVertices(obj.unmovedId, graph);
+           }
 
-                   if (typeof space === "number") {
-                       for (i = 0; i < space; i += 1) {
-                           indent += " ";
-                       }
+           return graph;
+         } // check if moving way endpoint can cross an unmoved way, if so limit delta..
 
-       // If the space parameter is a string, it will be used as the indent string.
 
-                   } else if (typeof space === "string") {
-                       indent = space;
-                   }
+         function limitDelta(graph) {
+           function moveNode(loc) {
+             return geoVecAdd(projection(loc), _delta);
+           }
 
-       // If there is a replacer, it must be a function or an array.
-       // Otherwise, throw an error.
+           for (var i = 0; i < cache.intersections.length; i++) {
+             var obj = cache.intersections[i]; // Don't limit movement if this is vertex joins 2 endpoints..
 
-                   rep = replacer;
-                   if (replacer && typeof replacer !== "function" &&
-                           (typeof replacer !== "object" ||
-                           typeof replacer.length !== "number")) {
-                       throw new Error("JSON.stringify");
-                   }
+             if (obj.movedIsEP && obj.unmovedIsEP) continue; // Don't limit movement if this vertex is not an endpoint anyway..
 
-       // Make a fake root object containing our value under the key of "".
-       // Return the result of stringifying the value.
+             if (!obj.movedIsEP) continue;
+             var node = graph.entity(obj.nodeId);
+             var start = projection(node.loc);
+             var end = geoVecAdd(start, _delta);
+             var movedNodes = graph.childNodes(graph.entity(obj.movedId));
+             var movedPath = movedNodes.map(function (n) {
+               return moveNode(n.loc);
+             });
+             var unmovedNodes = graph.childNodes(graph.entity(obj.unmovedId));
+             var unmovedPath = unmovedNodes.map(function (n) {
+               return projection(n.loc);
+             });
+             var hits = geoPathIntersections(movedPath, unmovedPath);
 
-                   return str("", {"": value});
-               };
+             for (var j = 0; i < hits.length; i++) {
+               if (geoVecEqual(hits[j], end)) continue;
+               var edge = geoChooseEdge(unmovedNodes, end, projection);
+               _delta = geoVecSubtract(projection(edge.loc), start);
+             }
            }
+         }
 
+         var action = function action(graph) {
+           if (_delta[0] === 0 && _delta[1] === 0) return graph;
+           setupCache(graph);
 
-       // If the JSON object does not yet have a parse method, give it one.
-
-           if (typeof JSON.parse !== "function") {
-               JSON.parse = function (text, reviver) {
+           if (cache.intersections.length) {
+             limitDelta(graph);
+           }
 
-       // The parse method takes a text and an optional reviver function, and returns
-       // a JavaScript value if the text is a valid JSON text.
+           for (var i = 0; i < cache.nodes.length; i++) {
+             var node = graph.entity(cache.nodes[i]);
+             var start = projection(node.loc);
+             var end = geoVecAdd(start, _delta);
+             graph = graph.replace(node.move(projection.invert(end)));
+           }
 
-                   var j;
+           if (cache.intersections.length) {
+             graph = cleanupIntersections(graph);
+           }
 
-                   function walk(holder, key) {
-
-       // The walk method is used to recursively walk the resulting structure so
-       // that modifications can be made.
-
-                       var k;
-                       var v;
-                       var value = holder[key];
-                       if (value && typeof value === "object") {
-                           for (k in value) {
-                               if (Object.prototype.hasOwnProperty.call(value, k)) {
-                                   v = walk(value, k);
-                                   if (v !== undefined) {
-                                       value[k] = v;
-                                   } else {
-                                       delete value[k];
-                                   }
-                               }
-                           }
-                       }
-                       return reviver.call(holder, key, value);
-                   }
+           return graph;
+         };
 
+         action.delta = function () {
+           return _delta;
+         };
 
-       // Parsing happens in four stages. In the first stage, we replace certain
-       // Unicode characters with escape sequences. JavaScript handles many characters
-       // incorrectly, either silently deleting them, or treating them as line endings.
+         return action;
+       }
 
-                   text = String(text);
-                   rx_dangerous.lastIndex = 0;
-                   if (rx_dangerous.test(text)) {
-                       text = text.replace(rx_dangerous, function (a) {
-                           return "\\u" +
-                                   ("0000" + a.charCodeAt(0).toString(16)).slice(-4);
-                       });
-                   }
+       function actionMoveMember(relationId, fromIndex, toIndex) {
+         return function (graph) {
+           return graph.replace(graph.entity(relationId).moveMember(fromIndex, toIndex));
+         };
+       }
 
-       // In the second stage, we run the text against regular expressions that look
-       // for non-JSON patterns. We are especially concerned with "()" and "new"
-       // because they can cause invocation, and "=" because it can cause mutation.
-       // But just to be safe, we want to reject all unexpected forms.
-
-       // We split the second stage into 4 regexp operations in order to work around
-       // crippling inefficiencies in IE's and Safari's regexp engines. First we
-       // replace the JSON backslash pairs with "@" (a non-JSON character). Second, we
-       // replace all simple value tokens with "]" characters. Third, we delete all
-       // open brackets that follow a colon or comma or that begin the text. Finally,
-       // we look to see that the remaining characters are only whitespace or "]" or
-       // "," or ":" or "{" or "}". If that is so, then the text is safe for eval.
-
-                   if (
-                       rx_one.test(
-                           text
-                               .replace(rx_two, "@")
-                               .replace(rx_three, "]")
-                               .replace(rx_four, "")
-                       )
-                   ) {
-
-       // In the third stage we use the eval function to compile the text into a
-       // JavaScript structure. The "{" operator is subject to a syntactic ambiguity
-       // in JavaScript: it can begin a block or an object literal. We wrap the text
-       // in parens to eliminate the ambiguity.
-
-                       j = eval("(" + text + ")");
-
-       // In the optional fourth stage, we recursively walk the new structure, passing
-       // each name/value pair to a reviver function for possible transformation.
-
-                       return (typeof reviver === "function")
-                           ? walk({"": j}, "")
-                           : j;
-                   }
+       function actionMoveNode(nodeID, toLoc) {
+         var action = function action(graph, t) {
+           if (t === null || !isFinite(t)) t = 1;
+           t = Math.min(Math.max(+t, 0), 1);
+           var node = graph.entity(nodeID);
+           return graph.replace(node.move(geoVecInterp(node.loc, toLoc, t)));
+         };
 
-       // If the text is not JSON parseable, then a SyntaxError is thrown.
+         action.transitionable = true;
+         return action;
+       }
 
-                   throw new SyntaxError("JSON.parse");
-               };
-           }
-       }());
+       function actionNoop() {
+         return function (graph) {
+           return graph;
+         };
+       }
 
-       var json2 = json2Plugin;
+       function actionOrthogonalize(wayID, projection, vertexID, degThresh, ep) {
+         var epsilon = ep || 1e-4;
+         var threshold = degThresh || 13; // degrees within right or straight to alter
+         // We test normalized dot products so we can compare as cos(angle)
 
-       function json2Plugin() {
-               
-               return {}
-       }
+         var lowerThreshold = Math.cos((90 - threshold) * Math.PI / 180);
+         var upperThreshold = Math.cos(threshold * Math.PI / 180);
 
-       var plugins = [json2];
+         var action = function action(graph, t) {
+           if (t === null || !isFinite(t)) t = 1;
+           t = Math.min(Math.max(+t, 0), 1);
+           var way = graph.entity(wayID);
+           way = way.removeNode(''); // sanity check - remove any consecutive duplicates
 
-       var store_legacy = storeEngine.createStore(all, plugins);
+           if (way.tags.nonsquare) {
+             var tags = Object.assign({}, way.tags); // since we're squaring, remove indication that this is physically unsquare
 
-       // # osm-auth
-       //
-       // This code is only compatible with IE10+ because the [XDomainRequest](http://bit.ly/LfO7xo)
-       // object, IE<10's idea of [CORS](http://en.wikipedia.org/wiki/Cross-origin_resource_sharing),
-       // does not support custom headers, which this uses everywhere.
-       var osmAuth = function(o) {
+             delete tags.nonsquare;
+             way = way.update({
+               tags: tags
+             });
+           }
 
-           var oauth = {};
+           graph = graph.replace(way);
+           var isClosed = way.isClosed();
+           var nodes = graph.childNodes(way).slice(); // shallow copy
 
-           // authenticated users will also have a request token secret, but it's
-           // not used in transactions with the server
-           oauth.authenticated = function() {
-               return !!(token('oauth_token') && token('oauth_token_secret'));
-           };
+           if (isClosed) nodes.pop();
 
-           oauth.logout = function() {
-               token('oauth_token', '');
-               token('oauth_token_secret', '');
-               token('oauth_request_token_secret', '');
-               return oauth;
-           };
+           if (vertexID !== undefined) {
+             nodes = nodeSubset(nodes, vertexID, isClosed);
+             if (nodes.length !== 3) return graph;
+           } // note: all geometry functions here use the unclosed node/point/coord list
 
-           // TODO: detect lack of click event
-           oauth.authenticate = function(callback) {
-               if (oauth.authenticated()) return callback();
-
-               oauth.logout();
-
-               // ## Getting a request token
-               var params = timenonce(getAuth(o)),
-                   url = o.url + '/oauth/request_token';
-
-               params.oauth_signature = ohauth_1.signature(
-                   o.oauth_secret, '',
-                   ohauth_1.baseString('POST', url, params));
-
-               if (!o.singlepage) {
-                   // Create a 600x550 popup window in the center of the screen
-                   var w = 600, h = 550,
-                       settings = [
-                           ['width', w], ['height', h],
-                           ['left', screen.width / 2 - w / 2],
-                           ['top', screen.height / 2 - h / 2]].map(function(x) {
-                               return x.join('=');
-                           }).join(','),
-                       popup = window.open('about:blank', 'oauth_window', settings);
-               }
-
-               // Request a request token. When this is complete, the popup
-               // window is redirected to OSM's authorization page.
-               ohauth_1.xhr('POST', url, params, null, {}, reqTokenDone);
-               o.loading();
-
-               function reqTokenDone(err, xhr) {
-                   o.done();
-                   if (err) return callback(err);
-                   var resp = ohauth_1.stringQs(xhr.response);
-                   token('oauth_request_token_secret', resp.oauth_token_secret);
-                   var authorize_url = o.url + '/oauth/authorize?' + ohauth_1.qsString({
-                       oauth_token: resp.oauth_token,
-                       oauth_callback: resolveUrl$1(o.landing)
-                   });
 
-                   if (o.singlepage) {
-                       location.href = authorize_url;
-                   } else {
-                       popup.location = authorize_url;
-                   }
-               }
+           var nodeCount = {};
+           var points = [];
+           var corner = {
+             i: 0,
+             dotp: 1
+           };
+           var node, point, loc, score, motions, i, j;
+
+           for (i = 0; i < nodes.length; i++) {
+             node = nodes[i];
+             nodeCount[node.id] = (nodeCount[node.id] || 0) + 1;
+             points.push({
+               id: node.id,
+               coord: projection(node.loc)
+             });
+           }
 
-               // Called by a function in a landing page, in the popup window. The
-               // window closes itself.
-               window.authComplete = function(token) {
-                   var oauth_token = ohauth_1.stringQs(token.split('?')[1]);
-                   get_access_token(oauth_token.oauth_token);
-                   delete window.authComplete;
-               };
+           if (points.length === 3) {
+             // move only one vertex for right triangle
+             for (i = 0; i < 1000; i++) {
+               motions = points.map(calcMotion);
+               points[corner.i].coord = geoVecAdd(points[corner.i].coord, motions[corner.i]);
+               score = corner.dotp;
 
-               // ## Getting an request token
-               //
-               // At this point we have an `oauth_token`, brought in from a function
-               // call on a landing page popup.
-               function get_access_token(oauth_token) {
-                   var url = o.url + '/oauth/access_token',
-                       params = timenonce(getAuth(o)),
-                       request_token_secret = token('oauth_request_token_secret');
-                   params.oauth_token = oauth_token;
-                   params.oauth_signature = ohauth_1.signature(
-                       o.oauth_secret,
-                       request_token_secret,
-                       ohauth_1.baseString('POST', url, params));
-
-                   // ## Getting an access token
-                   //
-                   // The final token required for authentication. At this point
-                   // we have a `request token secret`
-                   ohauth_1.xhr('POST', url, params, null, {}, accessTokenDone);
-                   o.loading();
-               }
-
-               function accessTokenDone(err, xhr) {
-                   o.done();
-                   if (err) return callback(err);
-                   var access_token = ohauth_1.stringQs(xhr.response);
-                   token('oauth_token', access_token.oauth_token);
-                   token('oauth_token_secret', access_token.oauth_token_secret);
-                   callback(null, oauth);
+               if (score < epsilon) {
+                 break;
                }
-           };
-
-           oauth.bootstrapToken = function(oauth_token, callback) {
-               // ## Getting an request token
-               // At this point we have an `oauth_token`, brought in from a function
-               // call on a landing page popup.
-               function get_access_token(oauth_token) {
-                   var url = o.url + '/oauth/access_token',
-                       params = timenonce(getAuth(o)),
-                       request_token_secret = token('oauth_request_token_secret');
-                   params.oauth_token = oauth_token;
-                   params.oauth_signature = ohauth_1.signature(
-                       o.oauth_secret,
-                       request_token_secret,
-                       ohauth_1.baseString('POST', url, params));
-
-                   // ## Getting an access token
-                   // The final token required for authentication. At this point
-                   // we have a `request token secret`
-                   ohauth_1.xhr('POST', url, params, null, {}, accessTokenDone);
-                   o.loading();
-               }
-
-               function accessTokenDone(err, xhr) {
-                   o.done();
-                   if (err) return callback(err);
-                   var access_token = ohauth_1.stringQs(xhr.response);
-                   token('oauth_token', access_token.oauth_token);
-                   token('oauth_token_secret', access_token.oauth_token_secret);
-                   callback(null, oauth);
-               }
-
-               get_access_token(oauth_token);
-           };
+             }
 
-           // # xhr
-           //
-           // A single XMLHttpRequest wrapper that does authenticated calls if the
-           // user has logged in.
-           oauth.xhr = function(options, callback) {
-               if (!oauth.authenticated()) {
-                   if (o.auto) {
-                       return oauth.authenticate(run);
-                   } else {
-                       callback('not authenticated', null);
-                       return;
-                   }
-               } else {
-                   return run();
-               }
-
-               function run() {
-                   var params = timenonce(getAuth(o)),
-                       oauth_token_secret = token('oauth_token_secret'),
-                       url = (options.prefix !== false) ? o.url + options.path : options.path,
-                       url_parts = url.replace(/#.*$/, '').split('?', 2),
-                       base_url = url_parts[0],
-                       query = (url_parts.length === 2) ? url_parts[1] : '';
-
-                   // https://tools.ietf.org/html/rfc5849#section-3.4.1.3.1
-                   if ((!options.options || !options.options.header ||
-                       options.options.header['Content-Type'] === 'application/x-www-form-urlencoded') &&
-                       options.content) {
-                       params = immutable(params, ohauth_1.stringQs(options.content));
-                   }
+             node = graph.entity(nodes[corner.i].id);
+             loc = projection.invert(points[corner.i].coord);
+             graph = graph.replace(node.move(geoVecInterp(node.loc, loc, t)));
+           } else {
+             var straights = [];
+             var simplified = []; // Remove points from nearly straight sections..
+             // This produces a simplified shape to orthogonalize
 
-                   params.oauth_token = token('oauth_token');
-                   params.oauth_signature = ohauth_1.signature(
-                       o.oauth_secret,
-                       oauth_token_secret,
-                       ohauth_1.baseString(options.method, base_url, immutable(params, ohauth_1.stringQs(query)))
-                   );
+             for (i = 0; i < points.length; i++) {
+               point = points[i];
+               var dotp = 0;
 
-                   return ohauth_1.xhr(options.method, url, params, options.content, options.options, done);
+               if (isClosed || i > 0 && i < points.length - 1) {
+                 var a = points[(i - 1 + points.length) % points.length];
+                 var b = points[(i + 1) % points.length];
+                 dotp = Math.abs(geoOrthoNormalizedDotProduct(a.coord, b.coord, point.coord));
                }
 
-               function done(err, xhr) {
-                   if (err) return callback(err);
-                   else if (xhr.responseXML) return callback(err, xhr.responseXML);
-                   else return callback(err, xhr.response);
+               if (dotp > upperThreshold) {
+                 straights.push(point);
+               } else {
+                 simplified.push(point);
                }
-           };
-
-           // pre-authorize this object, if we can just get a token and token_secret
-           // from the start
-           oauth.preauth = function(c) {
-               if (!c) return;
-               if (c.oauth_token) token('oauth_token', c.oauth_token);
-               if (c.oauth_token_secret) token('oauth_token_secret', c.oauth_token_secret);
-               return oauth;
-           };
-
-           oauth.options = function(_) {
-               if (!arguments.length) return o;
+             } // Orthogonalize the simplified shape
 
-               o = _;
-               o.url = o.url || 'https://www.openstreetmap.org';
-               o.landing = o.landing || 'land.html';
-               o.singlepage = o.singlepage || false;
 
-               // Optional loading and loading-done functions for nice UI feedback.
-               // by default, no-ops
-               o.loading = o.loading || function() {};
-               o.done = o.done || function() {};
+             var bestPoints = clonePoints(simplified);
+             var originalPoints = clonePoints(simplified);
+             score = Infinity;
 
-               return oauth.preauth(o);
-           };
-
-           // 'stamp' an authentication object from `getAuth()`
-           // with a [nonce](http://en.wikipedia.org/wiki/Cryptographic_nonce)
-           // and timestamp
-           function timenonce(o) {
-               o.oauth_timestamp = ohauth_1.timestamp();
-               o.oauth_nonce = ohauth_1.nonce();
-               return o;
-           }
+             for (i = 0; i < 1000; i++) {
+               motions = simplified.map(calcMotion);
 
-           // get/set tokens. These are prefixed with the base URL so that `osm-auth`
-           // can be used with multiple APIs and the keys in `localStorage`
-           // will not clash
-           var token;
+               for (j = 0; j < motions.length; j++) {
+                 simplified[j].coord = geoVecAdd(simplified[j].coord, motions[j]);
+               }
 
-           if (store_legacy.enabled) {
-               token = function (x, y) {
-                   if (arguments.length === 1) return store_legacy.get(o.url + x);
-                   else if (arguments.length === 2) return store_legacy.set(o.url + x, y);
-               };
-           } else {
-               var storage = {};
-               token = function (x, y) {
-                   if (arguments.length === 1) return storage[o.url + x];
-                   else if (arguments.length === 2) return storage[o.url + x] = y;
-               };
-           }
+               var newScore = geoOrthoCalcScore(simplified, isClosed, epsilon, threshold);
 
-           // Get an authentication object. If you just add and remove properties
-           // from a single object, you'll need to use `delete` to make sure that
-           // it doesn't contain undesired properties for authentication
-           function getAuth(o) {
-               return {
-                   oauth_consumer_key: o.oauth_consumer_key,
-                   oauth_signature_method: 'HMAC-SHA1'
-               };
-           }
+               if (newScore < score) {
+                 bestPoints = clonePoints(simplified);
+                 score = newScore;
+               }
 
-           // potentially pre-authorize
-           oauth.options(o);
+               if (score < epsilon) {
+                 break;
+               }
+             }
 
-           return oauth;
-       };
+             var bestCoords = bestPoints.map(function (p) {
+               return p.coord;
+             });
+             if (isClosed) bestCoords.push(bestCoords[0]); // move the nodes that should move
 
-       var JXON = new (function () {
-         var
-           sValueProp = 'keyValue', sAttributesProp = 'keyAttributes', sAttrPref = '@', /* you can customize these values */
-           aCache = [], rIsNull = /^\s*$/, rIsBool = /^(?:true|false)$/i;
+             for (i = 0; i < bestPoints.length; i++) {
+               point = bestPoints[i];
 
-         function parseText (sValue) {
-           if (rIsNull.test(sValue)) { return null; }
-           if (rIsBool.test(sValue)) { return sValue.toLowerCase() === 'true'; }
-           if (isFinite(sValue)) { return parseFloat(sValue); }
-           if (isFinite(Date.parse(sValue))) { return new Date(sValue); }
-           return sValue;
-         }
+               if (!geoVecEqual(originalPoints[i].coord, point.coord)) {
+                 node = graph.entity(point.id);
+                 loc = projection.invert(point.coord);
+                 graph = graph.replace(node.move(geoVecInterp(node.loc, loc, t)));
+               }
+             } // move the nodes along straight segments
 
-         function EmptyTree () { }
-         EmptyTree.prototype.toString = function () { return 'null'; };
-         EmptyTree.prototype.valueOf = function () { return null; };
 
-         function objectify (vValue) {
-           return vValue === null ? new EmptyTree() : vValue instanceof Object ? vValue : new vValue.constructor(vValue);
-         }
+             for (i = 0; i < straights.length; i++) {
+               point = straights[i];
+               if (nodeCount[point.id] > 1) continue; // skip self-intersections
 
-         function createObjTree (oParentNode, nVerb, bFreeze, bNesteAttr) {
-           var
-             nLevelStart = aCache.length, bChildren = oParentNode.hasChildNodes(),
-             bAttributes = oParentNode.hasAttributes(), bHighVerb = Boolean(nVerb & 2);
+               node = graph.entity(point.id);
 
-           var
-             sProp, vContent, nLength = 0, sCollectedTxt = '',
-             vResult = bHighVerb ? {} : /* put here the default value for empty nodes: */ true;
+               if (t === 1 && graph.parentWays(node).length === 1 && graph.parentRelations(node).length === 0 && !node.hasInterestingTags()) {
+                 // remove uninteresting points..
+                 graph = actionDeleteNode(node.id)(graph);
+               } else {
+                 // move interesting points to the nearest edge..
+                 var choice = geoVecProject(point.coord, bestCoords);
 
-           if (bChildren) {
-             for (var oNode, nItem = 0; nItem < oParentNode.childNodes.length; nItem++) {
-               oNode = oParentNode.childNodes.item(nItem);
-               if (oNode.nodeType === 4) { sCollectedTxt += oNode.nodeValue; } /* nodeType is 'CDATASection' (4) */
-               else if (oNode.nodeType === 3) { sCollectedTxt += oNode.nodeValue.trim(); } /* nodeType is 'Text' (3) */
-               else if (oNode.nodeType === 1 && !oNode.prefix) { aCache.push(oNode); } /* nodeType is 'Element' (1) */
+                 if (choice) {
+                   loc = projection.invert(choice.target);
+                   graph = graph.replace(node.move(geoVecInterp(node.loc, loc, t)));
+                 }
+               }
              }
            }
 
-           var nLevelEnd = aCache.length, vBuiltVal = parseText(sCollectedTxt);
-
-           if (!bHighVerb && (bChildren || bAttributes)) { vResult = nVerb === 0 ? objectify(vBuiltVal) : {}; }
+           return graph;
 
-           for (var nElId = nLevelStart; nElId < nLevelEnd; nElId++) {
-             sProp = aCache[nElId].nodeName.toLowerCase();
-             vContent = createObjTree(aCache[nElId], nVerb, bFreeze, bNesteAttr);
-             if (vResult.hasOwnProperty(sProp)) {
-               if (vResult[sProp].constructor !== Array) { vResult[sProp] = [vResult[sProp]]; }
-               vResult[sProp].push(vContent);
-             } else {
-               vResult[sProp] = vContent;
-               nLength++;
-             }
+           function clonePoints(array) {
+             return array.map(function (p) {
+               return {
+                 id: p.id,
+                 coord: [p.coord[0], p.coord[1]]
+               };
+             });
            }
 
-           if (bAttributes) {
-             var
-               nAttrLen = oParentNode.attributes.length,
-               sAPrefix = bNesteAttr ? '' : sAttrPref, oAttrParent = bNesteAttr ? {} : vResult;
+           function calcMotion(point, i, array) {
+             // don't try to move the endpoints of a non-closed way.
+             if (!isClosed && (i === 0 || i === array.length - 1)) return [0, 0]; // don't try to move a node that appears more than once (self intersection)
 
-             for (var oAttrib, nAttrib = 0; nAttrib < nAttrLen; nLength++, nAttrib++) {
-               oAttrib = oParentNode.attributes.item(nAttrib);
-               oAttrParent[sAPrefix + oAttrib.name.toLowerCase()] = parseText(oAttrib.value.trim());
-             }
+             if (nodeCount[array[i].id] > 1) return [0, 0];
+             var a = array[(i - 1 + array.length) % array.length].coord;
+             var origin = point.coord;
+             var b = array[(i + 1) % array.length].coord;
+             var p = geoVecSubtract(a, origin);
+             var q = geoVecSubtract(b, origin);
+             var scale = 2 * Math.min(geoVecLength(p), geoVecLength(q));
+             p = geoVecNormalize(p);
+             q = geoVecNormalize(q);
+             var dotp = p[0] * q[0] + p[1] * q[1];
+             var val = Math.abs(dotp);
 
-             if (bNesteAttr) {
-               if (bFreeze) { Object.freeze(oAttrParent); }
-               vResult[sAttributesProp] = oAttrParent;
-               nLength -= nAttrLen - 1;
+             if (val < lowerThreshold) {
+               // nearly orthogonal
+               corner.i = i;
+               corner.dotp = val;
+               var vec = geoVecNormalize(geoVecAdd(p, q));
+               return geoVecScale(vec, 0.1 * dotp * scale);
              }
-           }
 
-           if (nVerb === 3 || (nVerb === 2 || nVerb === 1 && nLength > 0) && sCollectedTxt) {
-             vResult[sValueProp] = vBuiltVal;
-           } else if (!bHighVerb && nLength === 0 && sCollectedTxt) {
-             vResult = vBuiltVal;
+             return [0, 0]; // do nothing
            }
+         }; // if we are only orthogonalizing one vertex,
+         // get that vertex and the previous and next
 
-           if (bFreeze && (bHighVerb || nLength > 0)) { Object.freeze(vResult); }
-
-           aCache.length = nLevelStart;
-
-           return vResult;
-         }
 
-         function loadObjTree (oXMLDoc, oParentEl, oParentObj) {
-           var vValue, oChild;
+         function nodeSubset(nodes, vertexID, isClosed) {
+           var first = isClosed ? 0 : 1;
+           var last = isClosed ? nodes.length : nodes.length - 1;
 
-           if (oParentObj instanceof String || oParentObj instanceof Number || oParentObj instanceof Boolean) {
-             oParentEl.appendChild(oXMLDoc.createTextNode(oParentObj.toString())); /* verbosity level is 0 */
-           } else if (oParentObj.constructor === Date) {
-             oParentEl.appendChild(oXMLDoc.createTextNode(oParentObj.toGMTString()));    
+           for (var i = first; i < last; i++) {
+             if (nodes[i].id === vertexID) {
+               return [nodes[(i - 1 + nodes.length) % nodes.length], nodes[i], nodes[(i + 1) % nodes.length]];
+             }
            }
 
-           for (var sName in oParentObj) {
-             vValue = oParentObj[sName];
-             if (isFinite(sName) || vValue instanceof Function) { continue; } /* verbosity level is 0 */
-             if (sName === sValueProp) {
-               if (vValue !== null && vValue !== true) { oParentEl.appendChild(oXMLDoc.createTextNode(vValue.constructor === Date ? vValue.toGMTString() : String(vValue))); }
-             } else if (sName === sAttributesProp) { /* verbosity level is 3 */
-               for (var sAttrib in vValue) { oParentEl.setAttribute(sAttrib, vValue[sAttrib]); }
-             } else if (sName.charAt(0) === sAttrPref) {
-               oParentEl.setAttribute(sName.slice(1), vValue);
-             } else if (vValue.constructor === Array) {
-               for (var nItem = 0; nItem < vValue.length; nItem++) {
-                 oChild = oXMLDoc.createElement(sName);
-                 loadObjTree(oXMLDoc, oChild, vValue[nItem]);
-                 oParentEl.appendChild(oChild);
-               }
-             } else {
-               oChild = oXMLDoc.createElement(sName);
-               if (vValue instanceof Object) {
-                 loadObjTree(oXMLDoc, oChild, vValue);
-               } else if (vValue !== null && vValue !== true) {
-                 oChild.appendChild(oXMLDoc.createTextNode(vValue.toString()));
-               }
-               oParentEl.appendChild(oChild);
-            }
-          }
+           return [];
          }
 
-         this.build = function (oXMLParent, nVerbosity /* optional */, bFreeze /* optional */, bNesteAttributes /* optional */) {
-           var _nVerb = arguments.length > 1 && typeof nVerbosity === 'number' ? nVerbosity & 3 : /* put here the default verbosity level: */ 1;
-           return createObjTree(oXMLParent, _nVerb, bFreeze || false, arguments.length > 3 ? bNesteAttributes : _nVerb === 3);    
-         };
+         action.disabled = function (graph) {
+           var way = graph.entity(wayID);
+           way = way.removeNode(''); // sanity check - remove any consecutive duplicates
 
-         this.unbuild = function (oObjTree) {    
-           var oNewDoc = document.implementation.createDocument('', '', null);
-           loadObjTree(oNewDoc, oNewDoc, oObjTree);
-           return oNewDoc;
-         };
+           graph = graph.replace(way);
+           var isClosed = way.isClosed();
+           var nodes = graph.childNodes(way).slice(); // shallow copy
 
-         this.stringify = function (oObjTree) {
-           return (new XMLSerializer()).serializeToString(JXON.unbuild(oObjTree));
-         };
-       })();
+           if (isClosed) nodes.pop();
+           var allowStraightAngles = false;
 
-       // var myObject = JXON.build(doc);
-       // we got our javascript object! try: alert(JSON.stringify(myObject));
+           if (vertexID !== undefined) {
+             allowStraightAngles = true;
+             nodes = nodeSubset(nodes, vertexID, isClosed);
+             if (nodes.length !== 3) return 'end_vertex';
+           }
 
-       // var newDoc = JXON.unbuild(myObject);
-       // we got our Document instance! try: alert((new XMLSerializer()).serializeToString(newDoc));
+           var coords = nodes.map(function (n) {
+             return projection(n.loc);
+           });
+           var score = geoOrthoCanOrthogonalize(coords, isClosed, epsilon, threshold, allowStraightAngles);
 
-       var tiler$5 = utilTiler();
-       var dispatch$6 = dispatch('apiStatusChange', 'authLoading', 'authDone', 'change', 'loading', 'loaded', 'loadedNotes');
-       var urlroot = 'https://www.openstreetmap.org';
-       var oauth = osmAuth({
-           url: urlroot,
-           oauth_consumer_key: '5A043yRSEugj4DJ5TljuapfnrflWDte8jTOcWLlT',
-           oauth_secret: 'aB3jKq1TRsCOUrfOIZ6oQMEDmv2ptV76PA54NGLL',
-           loading: authLoading,
-           done: authDone
-       });
+           if (score === null) {
+             return 'not_squarish';
+           } else if (score === 0) {
+             return 'square_enough';
+           } else {
+             return false;
+           }
+         };
 
-       var _blacklists = ['.*\.google(apis)?\..*/(vt|kh)[\?/].*([xyz]=.*){3}.*'];
-       var _tileCache = { toLoad: {}, loaded: {}, inflight: {}, seen: {}, rtree: new RBush() };
-       var _noteCache = { toLoad: {}, loaded: {}, inflight: {}, inflightPost: {}, note: {}, closed: {}, rtree: new RBush() };
-       var _userCache = { toLoad: {}, user: {} };
-       var _cachedApiStatus;
-       var _changeset = {};
+         action.transitionable = true;
+         return action;
+       }
 
-       var _deferred = new Set();
-       var _connectionID = 1;
-       var _tileZoom$3 = 16;
-       var _noteZoom = 12;
-       var _rateLimitError;
-       var _userChangesets;
-       var _userDetails;
-       var _off;
+       //
+       // `turn` must be an `osmTurn` object
+       // see osm/intersection.js, pathToTurn()
+       //
+       // This specifies a restriction of type `restriction` when traveling from
+       // `turn.from.way` toward `turn.to.way` via `turn.via.node` OR `turn.via.ways`.
+       // (The action does not check that these entities form a valid intersection.)
+       //
+       // From, to, and via ways should be split before calling this action.
+       // (old versions of the code would split the ways here, but we no longer do it)
+       //
+       // For testing convenience, accepts a restrictionID to assign to the new
+       // relation. Normally, this will be undefined and the relation will
+       // automatically be assigned a new ID.
+       //
 
-       // set a default but also load this from the API status
-       var _maxWayNodes = 2000;
+       function actionRestrictTurn(turn, restrictionType, restrictionID) {
+         return function (graph) {
+           var fromWay = graph.entity(turn.from.way);
+           var toWay = graph.entity(turn.to.way);
+           var viaNode = turn.via.node && graph.entity(turn.via.node);
+           var viaWays = turn.via.ways && turn.via.ways.map(function (id) {
+             return graph.entity(id);
+           });
+           var members = [];
+           members.push({
+             id: fromWay.id,
+             type: 'way',
+             role: 'from'
+           });
 
+           if (viaNode) {
+             members.push({
+               id: viaNode.id,
+               type: 'node',
+               role: 'via'
+             });
+           } else if (viaWays) {
+             viaWays.forEach(function (viaWay) {
+               members.push({
+                 id: viaWay.id,
+                 type: 'way',
+                 role: 'via'
+               });
+             });
+           }
 
-       function authLoading() {
-           dispatch$6.call('authLoading');
+           members.push({
+             id: toWay.id,
+             type: 'way',
+             role: 'to'
+           });
+           return graph.replace(osmRelation({
+             id: restrictionID,
+             tags: {
+               type: 'restriction',
+               restriction: restrictionType
+             },
+             members: members
+           }));
+         };
        }
 
+       function actionRevert(id) {
+         var action = function action(graph) {
+           var entity = graph.hasEntity(id),
+               base = graph.base().entities[id];
+
+           if (entity && !base) {
+             // entity will be removed..
+             if (entity.type === 'node') {
+               graph.parentWays(entity).forEach(function (parent) {
+                 parent = parent.removeNode(id);
+                 graph = graph.replace(parent);
+
+                 if (parent.isDegenerate()) {
+                   graph = actionDeleteWay(parent.id)(graph);
+                 }
+               });
+             }
 
-       function authDone() {
-           dispatch$6.call('authDone');
-       }
-
+             graph.parentRelations(entity).forEach(function (parent) {
+               parent = parent.removeMembersWithID(id);
+               graph = graph.replace(parent);
 
-       function abortRequest$5(controllerOrXHR) {
-           if (controllerOrXHR) {
-               controllerOrXHR.abort();
+               if (parent.isDegenerate()) {
+                 graph = actionDeleteRelation(parent.id)(graph);
+               }
+             });
            }
-       }
 
+           return graph.revert(id);
+         };
 
-       function hasInflightRequests(cache) {
-           return Object.keys(cache.inflight).length;
+         return action;
        }
 
-
-       function abortUnwantedRequests$3(cache, visibleTiles) {
-           Object.keys(cache.inflight).forEach(function(k) {
-               if (cache.toLoad[k]) return;
-               if (visibleTiles.find(function(tile) { return k === tile.id; })) return;
-
-               abortRequest$5(cache.inflight[k]);
-               delete cache.inflight[k];
+       function actionRotate(rotateIds, pivot, angle, projection) {
+         var action = function action(graph) {
+           return graph.update(function (graph) {
+             utilGetAllNodes(rotateIds, graph).forEach(function (node) {
+               var point = geoRotate([projection(node.loc)], angle, pivot)[0];
+               graph = graph.replace(node.move(projection.invert(point)));
+             });
            });
-       }
-
+         };
 
-       function getLoc(attrs) {
-           var lon = attrs.lon && attrs.lon.value;
-           var lat = attrs.lat && attrs.lat.value;
-           return [parseFloat(lon), parseFloat(lat)];
+         return action;
        }
 
-
-       function getNodes(obj) {
-           var elems = obj.getElementsByTagName('nd');
-           var nodes = new Array(elems.length);
-           for (var i = 0, l = elems.length; i < l; i++) {
-               nodes[i] = 'n' + elems[i].attributes.ref.value;
-           }
-           return nodes;
+       function actionScale(ids, pivotLoc, scaleFactor, projection) {
+         return function (graph) {
+           return graph.update(function (graph) {
+             var point, radial;
+             utilGetAllNodes(ids, graph).forEach(function (node) {
+               point = projection(node.loc);
+               radial = [point[0] - pivotLoc[0], point[1] - pivotLoc[1]];
+               point = [pivotLoc[0] + scaleFactor * radial[0], pivotLoc[1] + scaleFactor * radial[1]];
+               graph = graph.replace(node.move(projection.invert(point)));
+             });
+           });
+         };
        }
 
-       function getNodesJSON(obj) {
-           var elems = obj.nodes;
-           var nodes = new Array(elems.length);
-           for (var i = 0, l = elems.length; i < l; i++) {
-               nodes[i] = 'n' + elems[i];
-           }
-           return nodes;
-       }
+       /* Align nodes along their common axis */
 
-       function getTags(obj) {
-           var elems = obj.getElementsByTagName('tag');
-           var tags = {};
-           for (var i = 0, l = elems.length; i < l; i++) {
-               var attrs = elems[i].attributes;
-               tags[attrs.k.value] = attrs.v.value;
-           }
+       function actionStraightenNodes(nodeIDs, projection) {
+         function positionAlongWay(a, o, b) {
+           return geoVecDot(a, b, o) / geoVecDot(b, b, o);
+         } // returns the endpoints of the long axis of symmetry of the `points` bounding rect
 
-           return tags;
-       }
 
+         function getEndpoints(points) {
+           var ssr = geoGetSmallestSurroundingRectangle(points); // Choose line pq = axis of symmetry.
+           // The shape's surrounding rectangle has 2 axes of symmetry.
+           // Snap points to the long axis
 
-       function getMembers(obj) {
-           var elems = obj.getElementsByTagName('member');
-           var members = new Array(elems.length);
-           for (var i = 0, l = elems.length; i < l; i++) {
-               var attrs = elems[i].attributes;
-               members[i] = {
-                   id: attrs.type.value[0] + attrs.ref.value,
-                   type: attrs.type.value,
-                   role: attrs.role.value
-               };
-           }
-           return members;
-       }
+           var p1 = [(ssr.poly[0][0] + ssr.poly[1][0]) / 2, (ssr.poly[0][1] + ssr.poly[1][1]) / 2];
+           var q1 = [(ssr.poly[2][0] + ssr.poly[3][0]) / 2, (ssr.poly[2][1] + ssr.poly[3][1]) / 2];
+           var p2 = [(ssr.poly[3][0] + ssr.poly[4][0]) / 2, (ssr.poly[3][1] + ssr.poly[4][1]) / 2];
+           var q2 = [(ssr.poly[1][0] + ssr.poly[2][0]) / 2, (ssr.poly[1][1] + ssr.poly[2][1]) / 2];
+           var isLong = geoVecLength(p1, q1) > geoVecLength(p2, q2);
 
-       function getMembersJSON(obj) {
-           var elems = obj.members;
-           var members = new Array(elems.length);
-           for (var i = 0, l = elems.length; i < l; i++) {
-               var attrs = elems[i];
-               members[i] = {
-                   id: attrs.type[0] + attrs.ref,
-                   type: attrs.type,
-                   role: attrs.role
-               };
+           if (isLong) {
+             return [p1, q1];
            }
-           return members;
-       }
-
-       function getVisible(attrs) {
-           return (!attrs.visible || attrs.visible.value !== 'false');
-       }
 
+           return [p2, q2];
+         }
 
-       function parseComments(comments) {
-           var parsedComments = [];
-
-           // for each comment
-           for (var i = 0; i < comments.length; i++) {
-               var comment = comments[i];
-               if (comment.nodeName === 'comment') {
-                   var childNodes = comment.childNodes;
-                   var parsedComment = {};
-
-                   for (var j = 0; j < childNodes.length; j++) {
-                       var node = childNodes[j];
-                       var nodeName = node.nodeName;
-                       if (nodeName === '#text') continue;
-                       parsedComment[nodeName] = node.textContent;
-
-                       if (nodeName === 'uid') {
-                           var uid = node.textContent;
-                           if (uid && !_userCache.user[uid]) {
-                               _userCache.toLoad[uid] = true;
-                           }
-                       }
-                   }
+         var action = function action(graph, t) {
+           if (t === null || !isFinite(t)) t = 1;
+           t = Math.min(Math.max(+t, 0), 1);
+           var nodes = nodeIDs.map(function (id) {
+             return graph.entity(id);
+           });
+           var points = nodes.map(function (n) {
+             return projection(n.loc);
+           });
+           var endpoints = getEndpoints(points);
+           var startPoint = endpoints[0];
+           var endPoint = endpoints[1]; // Move points onto the line connecting the endpoints
 
-                   if (parsedComment) {
-                       parsedComments.push(parsedComment);
-                   }
-               }
+           for (var i = 0; i < points.length; i++) {
+             var node = nodes[i];
+             var point = points[i];
+             var u = positionAlongWay(point, startPoint, endPoint);
+             var point2 = geoVecInterp(startPoint, endPoint, u);
+             var loc2 = projection.invert(point2);
+             graph = graph.replace(node.move(geoVecInterp(node.loc, loc2, t)));
            }
-           return parsedComments;
-       }
-
-
-       function encodeNoteRtree(note) {
-           return {
-               minX: note.loc[0],
-               minY: note.loc[1],
-               maxX: note.loc[0],
-               maxY: note.loc[1],
-               data: note
-           };
-       }
-
 
-       var jsonparsers = {
+           return graph;
+         };
 
-           node: function nodeData(obj, uid) {
-               return new osmNode({
-                   id:  uid,
-                   visible: typeof obj.visible === 'boolean' ? obj.visible : true,
-                   version: obj.version.toString(),
-                   changeset: obj.changeset.toString(),
-                   timestamp: obj.timestamp,
-                   user: obj.user,
-                   uid: obj.uid.toString(),
-                   loc: [parseFloat(obj.lon), parseFloat(obj.lat)],
-                   tags: obj.tags
-               });
-           },
+         action.disabled = function (graph) {
+           var nodes = nodeIDs.map(function (id) {
+             return graph.entity(id);
+           });
+           var points = nodes.map(function (n) {
+             return projection(n.loc);
+           });
+           var endpoints = getEndpoints(points);
+           var startPoint = endpoints[0];
+           var endPoint = endpoints[1];
+           var maxDistance = 0;
 
-           way: function wayData(obj, uid) {
-               return new osmWay({
-                   id:  uid,
-                   visible: typeof obj.visible === 'boolean' ? obj.visible : true,
-                   version: obj.version.toString(),
-                   changeset: obj.changeset.toString(),
-                   timestamp: obj.timestamp,
-                   user: obj.user,
-                   uid: obj.uid.toString(),
-                   tags: obj.tags,
-                   nodes: getNodesJSON(obj)
-               });
-           },
+           for (var i = 0; i < points.length; i++) {
+             var point = points[i];
+             var u = positionAlongWay(point, startPoint, endPoint);
+             var p = geoVecInterp(startPoint, endPoint, u);
+             var dist = geoVecLength(p, point);
 
-           relation: function relationData(obj, uid) {
-               return new osmRelation({
-                   id:  uid,
-                   visible: typeof obj.visible === 'boolean' ? obj.visible : true,
-                   version: obj.version.toString(),
-                   changeset: obj.changeset.toString(),
-                   timestamp: obj.timestamp,
-                   user: obj.user,
-                   uid: obj.uid.toString(),
-                   tags: obj.tags,
-                   members: getMembersJSON(obj)
-               });
+             if (!isNaN(dist) && dist > maxDistance) {
+               maxDistance = dist;
+             }
            }
-       };
 
-       function parseJSON(payload, callback, options) {
-           options = Object.assign({ skipSeen: true }, options);
-           if (!payload)  {
-               return callback({ message: 'No JSON', status: -1 });
+           if (maxDistance < 0.0001) {
+             return 'straight_enough';
            }
+         };
 
-           var json = payload;
-           if (typeof json !== 'object')
-              json = JSON.parse(payload);
+         action.transitionable = true;
+         return action;
+       }
 
-           if (!json.elements)
-               return callback({ message: 'No JSON', status: -1 });
+       /*
+        * Based on https://github.com/openstreetmap/potlatch2/net/systemeD/potlatch2/tools/Straighten.as
+        */
 
-           var children = json.elements;
+       function actionStraightenWay(selectedIDs, projection) {
+         function positionAlongWay(a, o, b) {
+           return geoVecDot(a, b, o) / geoVecDot(b, b, o);
+         } // Return all selected ways as a continuous, ordered array of nodes
 
-           var handle = window.requestIdleCallback(function() {
-               var results = [];
-               var result;
-               for (var i = 0; i < children.length; i++) {
-                   result = parseChild(children[i]);
-                   if (result) results.push(result);
-               }
-               callback(null, results);
-           });
 
-           _deferred.add(handle);
+         function allNodes(graph) {
+           var nodes = [];
+           var startNodes = [];
+           var endNodes = [];
+           var remainingWays = [];
+           var selectedWays = selectedIDs.filter(function (w) {
+             return graph.entity(w).type === 'way';
+           });
+           var selectedNodes = selectedIDs.filter(function (n) {
+             return graph.entity(n).type === 'node';
+           });
 
-           function parseChild(child) {
-               var parser = jsonparsers[child.type];
-               if (!parser) return null;
+           for (var i = 0; i < selectedWays.length; i++) {
+             var way = graph.entity(selectedWays[i]);
+             nodes = way.nodes.slice(0);
+             remainingWays.push(nodes);
+             startNodes.push(nodes[0]);
+             endNodes.push(nodes[nodes.length - 1]);
+           } // Remove duplicate end/startNodes (duplicate nodes cannot be at the line end,
+           //   and need to be removed so currNode difference calculation below works)
+           // i.e. ["n-1", "n-1", "n-2"] => ["n-2"]
 
-               var uid;
 
-               uid = osmEntity.id.fromOSM(child.type, child.id);
-               if (options.skipSeen) {
-                   if (_tileCache.seen[uid]) return null;  // avoid reparsing a "seen" entity
-                   _tileCache.seen[uid] = true;
-               }
+           startNodes = startNodes.filter(function (n) {
+             return startNodes.indexOf(n) === startNodes.lastIndexOf(n);
+           });
+           endNodes = endNodes.filter(function (n) {
+             return endNodes.indexOf(n) === endNodes.lastIndexOf(n);
+           }); // Choose the initial endpoint to start from
 
-               return parser(child, uid);
-           }
-       }
+           var currNode = utilArrayDifference(startNodes, endNodes).concat(utilArrayDifference(endNodes, startNodes))[0];
+           var nextWay = [];
+           nodes = []; // Create nested function outside of loop to avoid "function in loop" lint error
 
-       var parsers = {
-           node: function nodeData(obj, uid) {
-               var attrs = obj.attributes;
-               return new osmNode({
-                   id: uid,
-                   visible: getVisible(attrs),
-                   version: attrs.version.value,
-                   changeset: attrs.changeset && attrs.changeset.value,
-                   timestamp: attrs.timestamp && attrs.timestamp.value,
-                   user: attrs.user && attrs.user.value,
-                   uid: attrs.uid && attrs.uid.value,
-                   loc: getLoc(attrs),
-                   tags: getTags(obj)
-               });
-           },
+           var getNextWay = function getNextWay(currNode, remainingWays) {
+             return remainingWays.filter(function (way) {
+               return way[0] === currNode || way[way.length - 1] === currNode;
+             })[0];
+           }; // Add nodes to end of nodes array, until all ways are added
 
-           way: function wayData(obj, uid) {
-               var attrs = obj.attributes;
-               return new osmWay({
-                   id: uid,
-                   visible: getVisible(attrs),
-                   version: attrs.version.value,
-                   changeset: attrs.changeset && attrs.changeset.value,
-                   timestamp: attrs.timestamp && attrs.timestamp.value,
-                   user: attrs.user && attrs.user.value,
-                   uid: attrs.uid && attrs.uid.value,
-                   tags: getTags(obj),
-                   nodes: getNodes(obj),
-               });
-           },
 
-           relation: function relationData(obj, uid) {
-               var attrs = obj.attributes;
-               return new osmRelation({
-                   id: uid,
-                   visible: getVisible(attrs),
-                   version: attrs.version.value,
-                   changeset: attrs.changeset && attrs.changeset.value,
-                   timestamp: attrs.timestamp && attrs.timestamp.value,
-                   user: attrs.user && attrs.user.value,
-                   uid: attrs.uid && attrs.uid.value,
-                   tags: getTags(obj),
-                   members: getMembers(obj)
-               });
-           },
+           while (remainingWays.length) {
+             nextWay = getNextWay(currNode, remainingWays);
+             remainingWays = utilArrayDifference(remainingWays, [nextWay]);
 
-           note: function parseNote(obj, uid) {
-               var attrs = obj.attributes;
-               var childNodes = obj.childNodes;
-               var props = {};
+             if (nextWay[0] !== currNode) {
+               nextWay.reverse();
+             }
 
-               props.id = uid;
-               props.loc = getLoc(attrs);
+             nodes = nodes.concat(nextWay);
+             currNode = nodes[nodes.length - 1];
+           } // If user selected 2 nodes to straighten between, then slice nodes array to those nodes
 
-               // if notes are coincident, move them apart slightly
-               var coincident = false;
-               var epsilon = 0.00001;
-               do {
-                   if (coincident) {
-                       props.loc = geoVecAdd(props.loc, [epsilon, epsilon]);
-                   }
-                   var bbox = geoExtent(props.loc).bbox();
-                   coincident = _noteCache.rtree.search(bbox).length;
-               } while (coincident);
-
-               // parse note contents
-               for (var i = 0; i < childNodes.length; i++) {
-                   var node = childNodes[i];
-                   var nodeName = node.nodeName;
-                   if (nodeName === '#text') continue;
-
-                   // if the element is comments, parse the comments
-                   if (nodeName === 'comments') {
-                       props[nodeName] = parseComments(node.childNodes);
-                   } else {
-                       props[nodeName] = node.textContent;
-                   }
-               }
 
-               var note = new osmNote(props);
-               var item = encodeNoteRtree(note);
-               _noteCache.note[note.id] = note;
-               _noteCache.rtree.insert(item);
+           if (selectedNodes.length === 2) {
+             var startNodeIdx = nodes.indexOf(selectedNodes[0]);
+             var endNodeIdx = nodes.indexOf(selectedNodes[1]);
+             var sortedStartEnd = [startNodeIdx, endNodeIdx];
+             sortedStartEnd.sort(function (a, b) {
+               return a - b;
+             });
+             nodes = nodes.slice(sortedStartEnd[0], sortedStartEnd[1] + 1);
+           }
 
-               return note;
-           },
+           return nodes.map(function (n) {
+             return graph.entity(n);
+           });
+         }
 
-           user: function parseUser(obj, uid) {
-               var attrs = obj.attributes;
-               var user = {
-                   id: uid,
-                   display_name: attrs.display_name && attrs.display_name.value,
-                   account_created: attrs.account_created && attrs.account_created.value,
-                   changesets_count: '0',
-                   active_blocks: '0'
-               };
+         function shouldKeepNode(node, graph) {
+           return graph.parentWays(node).length > 1 || graph.parentRelations(node).length || node.hasInterestingTags();
+         }
 
-               var img = obj.getElementsByTagName('img');
-               if (img && img[0] && img[0].getAttribute('href')) {
-                   user.image_url = img[0].getAttribute('href');
-               }
+         var action = function action(graph, t) {
+           if (t === null || !isFinite(t)) t = 1;
+           t = Math.min(Math.max(+t, 0), 1);
+           var nodes = allNodes(graph);
+           var points = nodes.map(function (n) {
+             return projection(n.loc);
+           });
+           var startPoint = points[0];
+           var endPoint = points[points.length - 1];
+           var toDelete = [];
+           var i;
 
-               var changesets = obj.getElementsByTagName('changesets');
-               if (changesets && changesets[0] && changesets[0].getAttribute('count')) {
-                   user.changesets_count = changesets[0].getAttribute('count');
-               }
+           for (i = 1; i < points.length - 1; i++) {
+             var node = nodes[i];
+             var point = points[i];
 
-               var blocks = obj.getElementsByTagName('blocks');
-               if (blocks && blocks[0]) {
-                   var received = blocks[0].getElementsByTagName('received');
-                   if (received && received[0] && received[0].getAttribute('active')) {
-                       user.active_blocks = received[0].getAttribute('active');
-                   }
+             if (t < 1 || shouldKeepNode(node, graph)) {
+               var u = positionAlongWay(point, startPoint, endPoint);
+               var p = geoVecInterp(startPoint, endPoint, u);
+               var loc2 = projection.invert(p);
+               graph = graph.replace(node.move(geoVecInterp(node.loc, loc2, t)));
+             } else {
+               // safe to delete
+               if (toDelete.indexOf(node) === -1) {
+                 toDelete.push(node);
                }
-
-               _userCache.user[uid] = user;
-               delete _userCache.toLoad[uid];
-               return user;
+             }
            }
-       };
-
 
-       function parseXML(xml, callback, options) {
-           options = Object.assign({ skipSeen: true }, options);
-           if (!xml || !xml.childNodes) {
-               return callback({ message: 'No XML', status: -1 });
+           for (i = 0; i < toDelete.length; i++) {
+             graph = actionDeleteNode(toDelete[i].id)(graph);
            }
 
-           var root = xml.childNodes[0];
-           var children = root.childNodes;
+           return graph;
+         };
 
-           var handle = window.requestIdleCallback(function() {
-               var results = [];
-               var result;
-               for (var i = 0; i < children.length; i++) {
-                   result = parseChild(children[i]);
-                   if (result) results.push(result);
-               }
-               callback(null, results);
+         action.disabled = function (graph) {
+           // check way isn't too bendy
+           var nodes = allNodes(graph);
+           var points = nodes.map(function (n) {
+             return projection(n.loc);
            });
+           var startPoint = points[0];
+           var endPoint = points[points.length - 1];
+           var threshold = 0.2 * geoVecLength(startPoint, endPoint);
+           var i;
 
-           _deferred.add(handle);
-
-
-           function parseChild(child) {
-               var parser = parsers[child.nodeName];
-               if (!parser) return null;
-
-               var uid;
-               if (child.nodeName === 'user') {
-                   uid = child.attributes.id.value;
-                   if (options.skipSeen && _userCache.user[uid]) {
-                       delete _userCache.toLoad[uid];
-                       return null;
-                   }
+           if (threshold === 0) {
+             return 'too_bendy';
+           }
 
-               } else if (child.nodeName === 'note') {
-                   uid = child.getElementsByTagName('id')[0].textContent;
+           var maxDistance = 0;
 
-               } else {
-                   uid = osmEntity.id.fromOSM(child.nodeName, child.attributes.id.value);
-                   if (options.skipSeen) {
-                       if (_tileCache.seen[uid]) return null;  // avoid reparsing a "seen" entity
-                       _tileCache.seen[uid] = true;
-                   }
-               }
+           for (i = 1; i < points.length - 1; i++) {
+             var point = points[i];
+             var u = positionAlongWay(point, startPoint, endPoint);
+             var p = geoVecInterp(startPoint, endPoint, u);
+             var dist = geoVecLength(p, point); // to bendy if point is off by 20% of total start/end distance in projected space
 
-               return parser(child, uid);
+             if (isNaN(dist) || dist > threshold) {
+               return 'too_bendy';
+             } else if (dist > maxDistance) {
+               maxDistance = dist;
+             }
            }
-       }
-
 
-       // replace or remove note from rtree
-       function updateRtree$3(item, replace) {
-           _noteCache.rtree.remove(item, function isEql(a, b) { return a.data.id === b.data.id; });
+           var keepingAllNodes = nodes.every(function (node, i) {
+             return i === 0 || i === nodes.length - 1 || shouldKeepNode(node, graph);
+           });
 
-           if (replace) {
-               _noteCache.rtree.insert(item);
+           if (maxDistance < 0.0001 && // Allow straightening even if already straight in order to remove extraneous nodes
+           keepingAllNodes) {
+             return 'straight_enough';
            }
-       }
-
+         };
 
-       function wrapcb(thisArg, callback, cid) {
-           return function(err, result) {
-               if (err) {
-                   // 400 Bad Request, 401 Unauthorized, 403 Forbidden..
-                   if (err.status === 400 || err.status === 401 || err.status === 403) {
-                       thisArg.logout();
-                   }
-                   return callback.call(thisArg, err);
+         action.transitionable = true;
+         return action;
+       }
 
-               } else if (thisArg.getConnectionId() !== cid) {
-                   return callback.call(thisArg, { message: 'Connection Switched', status: -1 });
+       //
+       // `turn` must be an `osmTurn` object with a `restrictionID` property.
+       // see osm/intersection.js, pathToTurn()
+       //
 
-               } else {
-                   return callback.call(thisArg, err, result);
-               }
-           };
+       function actionUnrestrictTurn(turn) {
+         return function (graph) {
+           return actionDeleteRelation(turn.restrictionID)(graph);
+         };
        }
 
+       /* Reflect the given area around its axis of symmetry */
 
-       var serviceOsm = {
+       function actionReflect(reflectIds, projection) {
+         var _useLongAxis = true;
+
+         var action = function action(graph, t) {
+           if (t === null || !isFinite(t)) t = 1;
+           t = Math.min(Math.max(+t, 0), 1);
+           var nodes = utilGetAllNodes(reflectIds, graph);
+           var points = nodes.map(function (n) {
+             return projection(n.loc);
+           });
+           var ssr = geoGetSmallestSurroundingRectangle(points); // Choose line pq = axis of symmetry.
+           // The shape's surrounding rectangle has 2 axes of symmetry.
+           // Reflect across the longer axis by default.
+
+           var p1 = [(ssr.poly[0][0] + ssr.poly[1][0]) / 2, (ssr.poly[0][1] + ssr.poly[1][1]) / 2];
+           var q1 = [(ssr.poly[2][0] + ssr.poly[3][0]) / 2, (ssr.poly[2][1] + ssr.poly[3][1]) / 2];
+           var p2 = [(ssr.poly[3][0] + ssr.poly[4][0]) / 2, (ssr.poly[3][1] + ssr.poly[4][1]) / 2];
+           var q2 = [(ssr.poly[1][0] + ssr.poly[2][0]) / 2, (ssr.poly[1][1] + ssr.poly[2][1]) / 2];
+           var p, q;
+           var isLong = geoVecLength(p1, q1) > geoVecLength(p2, q2);
+
+           if (_useLongAxis && isLong || !_useLongAxis && !isLong) {
+             p = p1;
+             q = q1;
+           } else {
+             p = p2;
+             q = q2;
+           } // reflect c across pq
+           // http://math.stackexchange.com/questions/65503/point-reflection-over-a-line
 
-           init: function() {
-               utilRebind(this, dispatch$6, 'on');
-           },
 
+           var dx = q[0] - p[0];
+           var dy = q[1] - p[1];
+           var a = (dx * dx - dy * dy) / (dx * dx + dy * dy);
+           var b = 2 * dx * dy / (dx * dx + dy * dy);
 
-           reset: function() {
-               Array.from(_deferred).forEach(function(handle) {
-                   window.cancelIdleCallback(handle);
-                   _deferred.delete(handle);
-               });
+           for (var i = 0; i < nodes.length; i++) {
+             var node = nodes[i];
+             var c = projection(node.loc);
+             var c2 = [a * (c[0] - p[0]) + b * (c[1] - p[1]) + p[0], b * (c[0] - p[0]) - a * (c[1] - p[1]) + p[1]];
+             var loc2 = projection.invert(c2);
+             node = node.move(geoVecInterp(node.loc, loc2, t));
+             graph = graph.replace(node);
+           }
 
-               _connectionID++;
-               _userChangesets = undefined;
-               _userDetails = undefined;
-               _rateLimitError = undefined;
+           return graph;
+         };
 
-               Object.values(_tileCache.inflight).forEach(abortRequest$5);
-               Object.values(_noteCache.inflight).forEach(abortRequest$5);
-               Object.values(_noteCache.inflightPost).forEach(abortRequest$5);
-               if (_changeset.inflight) abortRequest$5(_changeset.inflight);
+         action.useLongAxis = function (val) {
+           if (!arguments.length) return _useLongAxis;
+           _useLongAxis = val;
+           return action;
+         };
 
-               _tileCache = { toLoad: {}, loaded: {}, inflight: {}, seen: {}, rtree: new RBush() };
-               _noteCache = { toLoad: {}, loaded: {}, inflight: {}, inflightPost: {}, note: {}, closed: {}, rtree: new RBush() };
-               _userCache = { toLoad: {}, user: {} };
-               _cachedApiStatus = undefined;
-               _changeset = {};
+         action.transitionable = true;
+         return action;
+       }
 
-               return this;
-           },
+       function actionUpgradeTags(entityId, oldTags, replaceTags) {
+         return function (graph) {
+           var entity = graph.entity(entityId);
+           var tags = Object.assign({}, entity.tags); // shallow copy
+
+           var transferValue;
+           var semiIndex;
+
+           for (var oldTagKey in oldTags) {
+             if (!(oldTagKey in tags)) continue; // wildcard match
+
+             if (oldTags[oldTagKey] === '*') {
+               // note the value since we might need to transfer it
+               transferValue = tags[oldTagKey];
+               delete tags[oldTagKey]; // exact match
+             } else if (oldTags[oldTagKey] === tags[oldTagKey]) {
+               delete tags[oldTagKey]; // match is within semicolon-delimited values
+             } else {
+               var vals = tags[oldTagKey].split(';').filter(Boolean);
+               var oldIndex = vals.indexOf(oldTags[oldTagKey]);
 
+               if (vals.length === 1 || oldIndex === -1) {
+                 delete tags[oldTagKey];
+               } else {
+                 if (replaceTags && replaceTags[oldTagKey]) {
+                   // replacing a value within a semicolon-delimited value, note the index
+                   semiIndex = oldIndex;
+                 }
 
-           getConnectionId: function() {
-               return _connectionID;
-           },
+                 vals.splice(oldIndex, 1);
+                 tags[oldTagKey] = vals.join(';');
+               }
+             }
+           }
 
+           if (replaceTags) {
+             for (var replaceKey in replaceTags) {
+               var replaceValue = replaceTags[replaceKey];
 
-           changesetURL: function(changesetID) {
-               return urlroot + '/changeset/' + changesetID;
-           },
+               if (replaceValue === '*') {
+                 if (tags[replaceKey] && tags[replaceKey] !== 'no') {
+                   // allow any pre-existing value except `no` (troll tag)
+                   continue;
+                 } else {
+                   // otherwise assume `yes` is okay
+                   tags[replaceKey] = 'yes';
+                 }
+               } else if (replaceValue === '$1') {
+                 tags[replaceKey] = transferValue;
+               } else {
+                 if (tags[replaceKey] && oldTags[replaceKey] && semiIndex !== undefined) {
+                   // don't override preexisting values
+                   var existingVals = tags[replaceKey].split(';').filter(Boolean);
 
+                   if (existingVals.indexOf(replaceValue) === -1) {
+                     existingVals.splice(semiIndex, 0, replaceValue);
+                     tags[replaceKey] = existingVals.join(';');
+                   }
+                 } else {
+                   tags[replaceKey] = replaceValue;
+                 }
+               }
+             }
+           }
 
-           changesetsURL: function(center, zoom) {
-               var precision = Math.max(0, Math.ceil(Math.log(zoom) / Math.LN2));
-               return urlroot + '/history#map=' +
-                   Math.floor(zoom) + '/' +
-                   center[1].toFixed(precision) + '/' +
-                   center[0].toFixed(precision);
-           },
+           return graph.replace(entity.update({
+             tags: tags
+           }));
+         };
+       }
 
+       function behaviorEdit(context) {
+         function behavior() {
+           context.map().minzoom(context.minEditableZoom());
+         }
 
-           entityURL: function(entity) {
-               return urlroot + '/' + entity.type + '/' + entity.osmId();
-           },
+         behavior.off = function () {
+           context.map().minzoom(0);
+         };
 
+         return behavior;
+       }
 
-           historyURL: function(entity) {
-               return urlroot + '/' + entity.type + '/' + entity.osmId() + '/history';
-           },
+       /*
+          The hover behavior adds the `.hover` class on pointerover to all elements to which
+          the identical datum is bound, and removes it on pointerout.
 
+          The :hover pseudo-class is insufficient for iD's purposes because a datum's visual
+          representation may consist of several elements scattered throughout the DOM hierarchy.
+          Only one of these elements can have the :hover pseudo-class, but all of them will
+          have the .hover class.
+        */
 
-           userURL: function(username) {
-               return urlroot + '/user/' + username;
-           },
+       function behaviorHover(context) {
+         var dispatch$1 = dispatch('hover');
 
+         var _selection = select(null);
 
-           noteURL: function(note) {
-               return urlroot + '/note/' + note.id;
-           },
+         var _newNodeId = null;
+         var _initialNodeID = null;
 
+         var _altDisables;
 
-           noteReportURL: function(note) {
-               return urlroot + '/reports/new?reportable_type=Note&reportable_id=' + note.id;
-           },
+         var _ignoreVertex;
 
+         var _targets = []; // use pointer events on supported platforms; fallback to mouse events
 
-           // Generic method to load data from the OSM API
-           // Can handle either auth or unauth calls.
-           loadFromAPI: function(path, callback, options) {
-               options = Object.assign({ skipSeen: true }, options);
-               var that = this;
-               var cid = _connectionID;
+         var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
 
-               function done(err, payload) {
-                   if (that.getConnectionId() !== cid) {
-                       if (callback) callback({ message: 'Connection Switched', status: -1 });
-                       return;
-                   }
+         function keydown(d3_event) {
+           if (_altDisables && d3_event.keyCode === utilKeybinding.modifierCodes.alt) {
+             _selection.selectAll('.hover').classed('hover-suppressed', true).classed('hover', false);
 
-                   var isAuthenticated = that.authenticated();
+             _selection.classed('hover-disabled', true);
 
-                   // 400 Bad Request, 401 Unauthorized, 403 Forbidden
-                   // Logout and retry the request..
-                   if (isAuthenticated && err && err.status &&
-                           (err.status === 400 || err.status === 401 || err.status === 403)) {
-                       that.logout();
-                       that.loadFromAPI(path, callback, options);
+             dispatch$1.call('hover', this, null);
+           }
+         }
 
-                   // else, no retry..
-                   } else {
-                       // 509 Bandwidth Limit Exceeded, 429 Too Many Requests
-                       // Set the rateLimitError flag and trigger a warning..
-                       if (!isAuthenticated && !_rateLimitError && err && err.status &&
-                               (err.status === 509 || err.status === 429)) {
-                           _rateLimitError = err;
-                           dispatch$6.call('change');
-                           that.reloadApiStatus();
-
-                       } else if ((err && _cachedApiStatus === 'online') ||
-                           (!err && _cachedApiStatus !== 'online')) {
-                           // If the response's error state doesn't match the status,
-                           // it's likely we lost or gained the connection so reload the status
-                           that.reloadApiStatus();
-                       }
+         function keyup(d3_event) {
+           if (_altDisables && d3_event.keyCode === utilKeybinding.modifierCodes.alt) {
+             _selection.selectAll('.hover-suppressed').classed('hover-suppressed', false).classed('hover', true);
 
-                       if (callback) {
-                           if (err) {
-                               return callback(err);
-                           } else {
-                               if (path.indexOf('.json') !== -1) {
-                                   return parseJSON(payload, callback, options);
-                               } else {
-                                   return parseXML(payload, callback, options);
-                               }
-                           }
-                       }
-                   }
-               }
+             _selection.classed('hover-disabled', false);
 
-               if (this.authenticated()) {
-                   return oauth.xhr({ method: 'GET', path: path }, done);
-               } else {
-                   var url = urlroot + path;
-                   var controller = new AbortController();
-                   d3_json(url, { signal: controller.signal })
-                       .then(function(data) {
-                           done(null, data);
-                       })
-                       .catch(function(err) {
-                           if (err.name === 'AbortError') return;
-                           // d3-fetch includes status in the error message,
-                           // but we can't access the response itself
-                           // https://github.com/d3/d3-fetch/issues/27
-                           var match = err.message.match(/^\d{3}/);
-                           if (match) {
-                               done({ status: +match[0], statusText: err.message });
-                           } else {
-                               done(err.message);
-                           }
-                       });
-                   return controller;
-               }
-           },
+             dispatch$1.call('hover', this, _targets);
+           }
+         }
 
+         function behavior(selection) {
+           _selection = selection;
+           _targets = [];
 
-           // Load a single entity by id (ways and relations use the `/full` call)
-           // GET /api/0.6/node/#id
-           // GET /api/0.6/[way|relation]/#id/full
-           loadEntity: function(id, callback) {
-               var type = osmEntity.id.type(id);
-               var osmID = osmEntity.id.toOSM(id);
-               var options = { skipSeen: false };
+           if (_initialNodeID) {
+             _newNodeId = _initialNodeID;
+             _initialNodeID = null;
+           } else {
+             _newNodeId = null;
+           }
 
-               this.loadFromAPI(
-                   '/api/0.6/' + type + '/' + osmID + (type !== 'node' ? '/full' : '') + '.json',
-                   function(err, entities) {
-                       if (callback) callback(err, { data: entities });
-                   },
-                   options
-               );
-           },
+           _selection.on(_pointerPrefix + 'over.hover', pointerover).on(_pointerPrefix + 'out.hover', pointerout) // treat pointerdown as pointerover for touch devices
+           .on(_pointerPrefix + 'down.hover', pointerover);
 
+           select(window).on(_pointerPrefix + 'up.hover pointercancel.hover', pointerout, true).on('keydown.hover', keydown).on('keyup.hover', keyup);
 
-           // Load a single entity with a specific version
-           // GET /api/0.6/[node|way|relation]/#id/#version
-           loadEntityVersion: function(id, version, callback) {
-               var type = osmEntity.id.type(id);
-               var osmID = osmEntity.id.toOSM(id);
-               var options = { skipSeen: false };
+           function eventTarget(d3_event) {
+             var datum = d3_event.target && d3_event.target.__data__;
+             if (_typeof(datum) !== 'object') return null;
 
-               this.loadFromAPI(
-                   '/api/0.6/' + type + '/' + osmID + '/' + version + '.json',
-                   function(err, entities) {
-                       if (callback) callback(err, { data: entities });
-                   },
-                   options
-               );
-           },
+             if (!(datum instanceof osmEntity) && datum.properties && datum.properties.entity instanceof osmEntity) {
+               return datum.properties.entity;
+             }
 
+             return datum;
+           }
 
-           // Load multiple entities in chunks
-           // (note: callback may be called multiple times)
-           // Unlike `loadEntity`, child nodes and members are not fetched
-           // GET /api/0.6/[nodes|ways|relations]?#parameters
-           loadMultiple: function(ids, callback) {
-               var that = this;
-               var groups = utilArrayGroupBy(utilArrayUniq(ids), osmEntity.id.type);
-
-               Object.keys(groups).forEach(function(k) {
-                   var type = k + 's';   // nodes, ways, relations
-                   var osmIDs = groups[k].map(function(id) { return osmEntity.id.toOSM(id); });
-                   var options = { skipSeen: false };
-
-                   utilArrayChunk(osmIDs, 150).forEach(function(arr) {
-                       that.loadFromAPI(
-                           '/api/0.6/' + type + '.json?' + type + '=' + arr.join(),
-                           function(err, entities) {
-                               if (callback) callback(err, { data: entities });
-                           },
-                           options
-                       );
-                   });
-               });
-           },
+           function pointerover(d3_event) {
+             // ignore mouse hovers with buttons pressed unless dragging
+             if (context.mode().id.indexOf('drag') === -1 && (!d3_event.pointerType || d3_event.pointerType === 'mouse') && d3_event.buttons) return;
+             var target = eventTarget(d3_event);
 
+             if (target && _targets.indexOf(target) === -1) {
+               _targets.push(target);
 
-           // Create, upload, and close a changeset
-           // PUT /api/0.6/changeset/create
-           // POST /api/0.6/changeset/#id/upload
-           // PUT /api/0.6/changeset/#id/close
-           putChangeset: function(changeset, changes, callback) {
-               var cid = _connectionID;
+               updateHover(d3_event, _targets);
+             }
+           }
 
-               if (_changeset.inflight) {
-                   return callback({ message: 'Changeset already inflight', status: -2 }, changeset);
+           function pointerout(d3_event) {
+             var target = eventTarget(d3_event);
 
-               } else if (_changeset.open) {   // reuse existing open changeset..
-                   return createdChangeset.call(this, null, _changeset.open);
+             var index = _targets.indexOf(target);
 
-               } else {   // Open a new changeset..
-                   var options = {
-                       method: 'PUT',
-                       path: '/api/0.6/changeset/create',
-                       options: { header: { 'Content-Type': 'text/xml' } },
-                       content: JXON.stringify(changeset.asJXON())
-                   };
-                   _changeset.inflight = oauth.xhr(
-                       options,
-                       wrapcb(this, createdChangeset, cid)
-                   );
-               }
+             if (index !== -1) {
+               _targets.splice(index);
 
+               updateHover(d3_event, _targets);
+             }
+           }
 
-               function createdChangeset(err, changesetID) {
-                   _changeset.inflight = null;
-                   if (err) { return callback(err, changeset); }
+           function allowsVertex(d) {
+             return d.geometry(context.graph()) === 'vertex' || _mainPresetIndex.allowsVertex(d, context.graph());
+           }
 
-                   _changeset.open = changesetID;
-                   changeset = changeset.update({ id: changesetID });
+           function modeAllowsHover(target) {
+             var mode = context.mode();
 
-                   // Upload the changeset..
-                   var options = {
-                       method: 'POST',
-                       path: '/api/0.6/changeset/' + changesetID + '/upload',
-                       options: { header: { 'Content-Type': 'text/xml' } },
-                       content: JXON.stringify(changeset.osmChangeJXON(changes))
-                   };
-                   _changeset.inflight = oauth.xhr(
-                       options,
-                       wrapcb(this, uploadedChangeset, cid)
-                   );
-               }
-
-
-               function uploadedChangeset(err) {
-                   _changeset.inflight = null;
-                   if (err) return callback(err, changeset);
-
-                   // Upload was successful, safe to call the callback.
-                   // Add delay to allow for postgres replication #1646 #2678
-                   window.setTimeout(function() { callback(null, changeset); }, 2500);
-                   _changeset.open = null;
-
-                   // At this point, we don't really care if the connection was switched..
-                   // Only try to close the changeset if we're still talking to the same server.
-                   if (this.getConnectionId() === cid) {
-                       // Still attempt to close changeset, but ignore response because #2667
-                       oauth.xhr({
-                           method: 'PUT',
-                           path: '/api/0.6/changeset/' + changeset.id + '/close',
-                           options: { header: { 'Content-Type': 'text/xml' } }
-                       }, function() { return true; });
-                   }
-               }
-           },
+             if (mode.id === 'add-point') {
+               return mode.preset.matchGeometry('vertex') || target.type !== 'way' && target.geometry(context.graph()) !== 'vertex';
+             }
 
+             return true;
+           }
 
-           // Load multiple users in chunks
-           // (note: callback may be called multiple times)
-           // GET /api/0.6/users?users=#id1,#id2,...,#idn
-           loadUsers: function(uids, callback) {
-               var toLoad = [];
-               var cached = [];
+           function updateHover(d3_event, targets) {
+             _selection.selectAll('.hover').classed('hover', false);
 
-               utilArrayUniq(uids).forEach(function(uid) {
-                   if (_userCache.user[uid]) {
-                       delete _userCache.toLoad[uid];
-                       cached.push(_userCache.user[uid]);
-                   } else {
-                       toLoad.push(uid);
-                   }
+             _selection.selectAll('.hover-suppressed').classed('hover-suppressed', false);
+
+             var mode = context.mode();
+
+             if (!_newNodeId && (mode.id === 'draw-line' || mode.id === 'draw-area')) {
+               var node = targets.find(function (target) {
+                 return target instanceof osmEntity && target.type === 'node';
                });
+               _newNodeId = node && node.id;
+             }
 
-               if (cached.length || !this.authenticated()) {
-                   callback(undefined, cached);
-                   if (!this.authenticated()) return;  // require auth
+             targets = targets.filter(function (datum) {
+               if (datum instanceof osmEntity) {
+                 // If drawing a way, don't hover on a node that was just placed. #3974
+                 return datum.id !== _newNodeId && (datum.type !== 'node' || !_ignoreVertex || allowsVertex(datum)) && modeAllowsHover(datum);
                }
 
-               utilArrayChunk(toLoad, 150).forEach(function(arr) {
-                   oauth.xhr(
-                       { method: 'GET', path: '/api/0.6/users?users=' + arr.join() },
-                       wrapcb(this, done, _connectionID)
-                   );
-               }.bind(this));
+               return true;
+             });
+             var selector = '';
 
-               function done(err, xml) {
-                   if (err) { return callback(err); }
+             for (var i in targets) {
+               var datum = targets[i]; // What are we hovering over?
 
-                   var options = { skipSeen: true };
-                   return parseXML(xml, function(err, results) {
-                       if (err) {
-                           return callback(err);
-                       } else {
-                           return callback(undefined, results);
-                       }
-                   }, options);
+               if (datum.__featurehash__) {
+                 // hovering custom data
+                 selector += ', .data' + datum.__featurehash__;
+               } else if (datum instanceof QAItem) {
+                 selector += ', .' + datum.service + '.itemId-' + datum.id;
+               } else if (datum instanceof osmNote) {
+                 selector += ', .note-' + datum.id;
+               } else if (datum instanceof osmEntity) {
+                 selector += ', .' + datum.id;
+
+                 if (datum.type === 'relation') {
+                   for (var j in datum.members) {
+                     selector += ', .' + datum.members[j].id;
+                   }
+                 }
                }
-           },
+             }
 
+             var suppressed = _altDisables && d3_event && d3_event.altKey;
 
-           // Load a given user by id
-           // GET /api/0.6/user/#id
-           loadUser: function(uid, callback) {
-               if (_userCache.user[uid] || !this.authenticated()) {   // require auth
-                   delete _userCache.toLoad[uid];
-                   return callback(undefined, _userCache.user[uid]);
-               }
+             if (selector.trim().length) {
+               // remove the first comma
+               selector = selector.slice(1);
 
-               oauth.xhr(
-                   { method: 'GET', path: '/api/0.6/user/' + uid },
-                   wrapcb(this, done, _connectionID)
-               );
+               _selection.selectAll(selector).classed(suppressed ? 'hover-suppressed' : 'hover', true);
+             }
 
-               function done(err, xml) {
-                   if (err) { return callback(err); }
+             dispatch$1.call('hover', this, !suppressed && targets);
+           }
+         }
 
-                   var options = { skipSeen: true };
-                   return parseXML(xml, function(err, results) {
-                       if (err) {
-                           return callback(err);
-                       } else {
-                           return callback(undefined, results[0]);
-                       }
-                   }, options);
-               }
-           },
+         behavior.off = function (selection) {
+           selection.selectAll('.hover').classed('hover', false);
+           selection.selectAll('.hover-suppressed').classed('hover-suppressed', false);
+           selection.classed('hover-disabled', false);
+           selection.on(_pointerPrefix + 'over.hover', null).on(_pointerPrefix + 'out.hover', null).on(_pointerPrefix + 'down.hover', null);
+           select(window).on(_pointerPrefix + 'up.hover pointercancel.hover', null, true).on('keydown.hover', null).on('keyup.hover', null);
+         };
 
+         behavior.altDisables = function (val) {
+           if (!arguments.length) return _altDisables;
+           _altDisables = val;
+           return behavior;
+         };
 
-           // Load the details of the logged-in user
-           // GET /api/0.6/user/details
-           userDetails: function(callback) {
-               if (_userDetails) {    // retrieve cached
-                   return callback(undefined, _userDetails);
-               }
+         behavior.ignoreVertex = function (val) {
+           if (!arguments.length) return _ignoreVertex;
+           _ignoreVertex = val;
+           return behavior;
+         };
 
-               oauth.xhr(
-                   { method: 'GET', path: '/api/0.6/user/details' },
-                   wrapcb(this, done, _connectionID)
-               );
+         behavior.initialNodeID = function (nodeId) {
+           _initialNodeID = nodeId;
+           return behavior;
+         };
 
-               function done(err, xml) {
-                   if (err) { return callback(err); }
+         return utilRebind(behavior, dispatch$1, 'on');
+       }
 
-                   var options = { skipSeen: false };
-                   return parseXML(xml, function(err, results) {
-                       if (err) {
-                           return callback(err);
-                       } else {
-                           _userDetails = results[0];
-                           return callback(undefined, _userDetails);
-                       }
-                   }, options);
-               }
-           },
+       var _disableSpace = false;
+       var _lastSpace = null;
+       function behaviorDraw(context) {
+         var dispatch$1 = dispatch('move', 'down', 'downcancel', 'click', 'clickWay', 'clickNode', 'undo', 'cancel', 'finish');
+         var keybinding = utilKeybinding('draw');
 
+         var _hover = behaviorHover(context).altDisables(true).ignoreVertex(true).on('hover', context.ui().sidebar.hover);
 
-           // Load previous changesets for the logged in user
-           // GET /api/0.6/changesets?user=#id
-           userChangesets: function(callback) {
-               if (_userChangesets) {    // retrieve cached
-                   return callback(undefined, _userChangesets);
-               }
+         var _edit = behaviorEdit(context);
 
-               this.userDetails(
-                   wrapcb(this, gotDetails, _connectionID)
-               );
+         var _closeTolerance = 4;
+         var _tolerance = 12;
+         var _mouseLeave = false;
+         var _lastMouse = null;
 
+         var _lastPointerUpEvent;
 
-               function gotDetails(err, user) {
-                   if (err) { return callback(err); }
+         var _downPointer; // use pointer events on supported platforms; fallback to mouse events
 
-                   oauth.xhr(
-                       { method: 'GET', path: '/api/0.6/changesets?user=' + user.id },
-                       wrapcb(this, done, _connectionID)
-                   );
-               }
 
-               function done(err, xml) {
-                   if (err) { return callback(err); }
+         var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse'; // related code
+         // - `mode/drag_node.js` `datum()`
 
-                   _userChangesets = Array.prototype.map.call(
-                       xml.getElementsByTagName('changeset'),
-                       function (changeset) { return { tags: getTags(changeset) }; }
-                   ).filter(function (changeset) {
-                       var comment = changeset.tags.comment;
-                       return comment && comment !== '';
-                   });
 
-                   return callback(undefined, _userChangesets);
-               }
-           },
+         function datum(d3_event) {
+           var mode = context.mode();
+           var isNote = mode && mode.id.indexOf('note') !== -1;
+           if (d3_event.altKey || isNote) return {};
+           var element;
 
+           if (d3_event.type === 'keydown') {
+             element = _lastMouse && _lastMouse.target;
+           } else {
+             element = d3_event.target;
+           } // When drawing, snap only to touch targets..
+           // (this excludes area fills and active drawing elements)
 
-           // Fetch the status of the OSM API
-           // GET /api/capabilities
-           status: function(callback) {
-               var url = urlroot + '/api/capabilities';
-               var errback = wrapcb(this, done, _connectionID);
-               d3_xml(url)
-                   .then(function(data) { errback(null, data); })
-                   .catch(function(err) { errback(err.message); });
 
-               function done(err, xml) {
-                   if (err) {
-                       // the status is null if no response could be retrieved
-                       return callback(err, null);
-                   }
+           var d = element.__data__;
+           return d && d.properties && d.properties.target ? d : {};
+         }
 
-                   // update blacklists
-                   var elements = xml.getElementsByTagName('blacklist');
-                   var regexes = [];
-                   for (var i = 0; i < elements.length; i++) {
-                       var regex = elements[i].getAttribute('regex');  // needs unencode?
-                       if (regex) {
-                           regexes.push(regex);
-                       }
-                   }
-                   if (regexes.length) {
-                       _blacklists = regexes;
-                   }
+         function pointerdown(d3_event) {
+           if (_downPointer) return;
+           var pointerLocGetter = utilFastMouse(this);
+           _downPointer = {
+             id: d3_event.pointerId || 'mouse',
+             pointerLocGetter: pointerLocGetter,
+             downTime: +new Date(),
+             downLoc: pointerLocGetter(d3_event)
+           };
+           dispatch$1.call('down', this, d3_event, datum(d3_event));
+         }
 
-                   if (_rateLimitError) {
-                       return callback(_rateLimitError, 'rateLimited');
-                   } else {
-                       var waynodes = xml.getElementsByTagName('waynodes');
-                       var maxWayNodes = waynodes.length && parseInt(waynodes[0].getAttribute('maximum'), 10);
-                       if (maxWayNodes && isFinite(maxWayNodes)) _maxWayNodes = maxWayNodes;
+         function pointerup(d3_event) {
+           if (!_downPointer || _downPointer.id !== (d3_event.pointerId || 'mouse')) return;
+           var downPointer = _downPointer;
+           _downPointer = null;
+           _lastPointerUpEvent = d3_event;
+           if (downPointer.isCancelled) return;
+           var t2 = +new Date();
+           var p2 = downPointer.pointerLocGetter(d3_event);
+           var dist = geoVecLength(downPointer.downLoc, p2);
 
-                       var apiStatus = xml.getElementsByTagName('status');
-                       var val = apiStatus[0].getAttribute('api');
-                       return callback(undefined, val);
-                   }
-               }
-           },
+           if (dist < _closeTolerance || dist < _tolerance && t2 - downPointer.downTime < 500) {
+             // Prevent a quick second click
+             select(window).on('click.draw-block', function () {
+               d3_event.stopPropagation();
+             }, true);
+             context.map().dblclickZoomEnable(false);
+             window.setTimeout(function () {
+               context.map().dblclickZoomEnable(true);
+               select(window).on('click.draw-block', null);
+             }, 500);
+             click(d3_event, p2);
+           }
+         }
 
-           // Calls `status` and dispatches an `apiStatusChange` event if the returned
-           // status differs from the cached status.
-           reloadApiStatus: function() {
-               // throttle to avoid unncessary API calls
-               if (!this.throttledReloadApiStatus) {
-                   var that = this;
-                   this.throttledReloadApiStatus = throttle(function() {
-                       that.status(function(err, status) {
-                           if (status !== _cachedApiStatus) {
-                               _cachedApiStatus = status;
-                               dispatch$6.call('apiStatusChange', that, err, status);
-                           }
-                       });
-                   }, 500);
-               }
-               this.throttledReloadApiStatus();
-           },
+         function pointermove(d3_event) {
+           if (_downPointer && _downPointer.id === (d3_event.pointerId || 'mouse') && !_downPointer.isCancelled) {
+             var p2 = _downPointer.pointerLocGetter(d3_event);
 
+             var dist = geoVecLength(_downPointer.downLoc, p2);
 
-           // Returns the maximum number of nodes a single way can have
-           maxWayNodes: function() {
-               return _maxWayNodes;
-           },
+             if (dist >= _closeTolerance) {
+               _downPointer.isCancelled = true;
+               dispatch$1.call('downcancel', this);
+             }
+           }
 
+           if (d3_event.pointerType && d3_event.pointerType !== 'mouse' || d3_event.buttons || _downPointer) return; // HACK: Mobile Safari likes to send one or more `mouse` type pointermove
+           // events immediately after non-mouse pointerup events; detect and ignore them.
 
-           // Load data (entities) from the API in tiles
-           // GET /api/0.6/map?bbox=
-           loadTiles: function(projection, callback) {
-               if (_off) return;
+           if (_lastPointerUpEvent && _lastPointerUpEvent.pointerType !== 'mouse' && d3_event.timeStamp - _lastPointerUpEvent.timeStamp < 100) return;
+           _lastMouse = d3_event;
+           dispatch$1.call('move', this, d3_event, datum(d3_event));
+         }
 
-               // determine the needed tiles to cover the view
-               var tiles = tiler$5.zoomExtent([_tileZoom$3, _tileZoom$3]).getTiles(projection);
+         function pointercancel(d3_event) {
+           if (_downPointer && _downPointer.id === (d3_event.pointerId || 'mouse')) {
+             if (!_downPointer.isCancelled) {
+               dispatch$1.call('downcancel', this);
+             }
 
-               // abort inflight requests that are no longer needed
-               var hadRequests = hasInflightRequests(_tileCache);
-               abortUnwantedRequests$3(_tileCache, tiles);
-               if (hadRequests && !hasInflightRequests(_tileCache)) {
-                   dispatch$6.call('loaded');    // stop the spinner
-               }
+             _downPointer = null;
+           }
+         }
 
-               // issue new requests..
-               tiles.forEach(function(tile) {
-                   this.loadTile(tile, callback);
-               }, this);
-           },
+         function mouseenter() {
+           _mouseLeave = false;
+         }
 
+         function mouseleave() {
+           _mouseLeave = true;
+         }
 
-           // Load a single data tile
-           // GET /api/0.6/map?bbox=
-           loadTile: function(tile, callback) {
-               if (_off) return;
-               if (_tileCache.loaded[tile.id] || _tileCache.inflight[tile.id]) return;
+         function allowsVertex(d) {
+           return d.geometry(context.graph()) === 'vertex' || _mainPresetIndex.allowsVertex(d, context.graph());
+         } // related code
+         // - `mode/drag_node.js`     `doMove()`
+         // - `behavior/draw.js`      `click()`
+         // - `behavior/draw_way.js`  `move()`
 
-               if (!hasInflightRequests(_tileCache)) {
-                   dispatch$6.call('loading');   // start the spinner
-               }
 
-               var path = '/api/0.6/map.json?bbox=';
-               var options = { skipSeen: true };
+         function click(d3_event, loc) {
+           var d = datum(d3_event);
+           var target = d && d.properties && d.properties.entity;
+           var mode = context.mode();
 
-               _tileCache.inflight[tile.id] = this.loadFromAPI(
-                   path + tile.extent.toParam(),
-                   tileCallback,
-                   options
-               );
+           if (target && target.type === 'node' && allowsVertex(target)) {
+             // Snap to a node
+             dispatch$1.call('clickNode', this, target, d);
+             return;
+           } else if (target && target.type === 'way' && (mode.id !== 'add-point' || mode.preset.matchGeometry('vertex'))) {
+             // Snap to a way
+             var choice = geoChooseEdge(context.graph().childNodes(target), loc, context.projection, context.activeID());
 
-               function tileCallback(err, parsed) {
-                   delete _tileCache.inflight[tile.id];
-                   if (!err) {
-                       delete _tileCache.toLoad[tile.id];
-                       _tileCache.loaded[tile.id] = true;
-                       var bbox = tile.extent.bbox();
-                       bbox.id = tile.id;
-                       _tileCache.rtree.insert(bbox);
-                   }
-                   if (callback) {
-                       callback(err, Object.assign({ data: parsed }, tile));
-                   }
-                   if (!hasInflightRequests(_tileCache)) {
-                       dispatch$6.call('loaded');     // stop the spinner
-                   }
-               }
-           },
+             if (choice) {
+               var edge = [target.nodes[choice.index - 1], target.nodes[choice.index]];
+               dispatch$1.call('clickWay', this, choice.loc, edge, d);
+               return;
+             }
+           } else if (mode.id !== 'add-point' || mode.preset.matchGeometry('point')) {
+             var locLatLng = context.projection.invert(loc);
+             dispatch$1.call('click', this, locLatLng, d);
+           }
+         } // treat a spacebar press like a click
 
 
-           isDataLoaded: function(loc) {
-               var bbox = { minX: loc[0], minY: loc[1], maxX: loc[0], maxY: loc[1] };
-               return _tileCache.rtree.collides(bbox);
-           },
+         function space(d3_event) {
+           d3_event.preventDefault();
+           d3_event.stopPropagation();
+           var currSpace = context.map().mouse();
 
+           if (_disableSpace && _lastSpace) {
+             var dist = geoVecLength(_lastSpace, currSpace);
 
-           // load the tile that covers the given `loc`
-           loadTileAtLoc: function(loc, callback) {
-               // Back off if the toLoad queue is filling up.. re #6417
-               // (Currently `loadTileAtLoc` requests are considered low priority - used by operations to
-               // let users safely edit geometries which extend to unloaded tiles.  We can drop some.)
-               if (Object.keys(_tileCache.toLoad).length > 50) return;
+             if (dist > _tolerance) {
+               _disableSpace = false;
+             }
+           }
 
-               var k = geoZoomToScale(_tileZoom$3 + 1);
-               var offset = geoRawMercator().scale(k)(loc);
-               var projection = geoRawMercator().transform({ k: k, x: -offset[0], y: -offset[1] });
-               var tiles = tiler$5.zoomExtent([_tileZoom$3, _tileZoom$3]).getTiles(projection);
+           if (_disableSpace || _mouseLeave || !_lastMouse) return; // user must move mouse or release space bar to allow another click
 
-               tiles.forEach(function(tile) {
-                   if (_tileCache.toLoad[tile.id] || _tileCache.loaded[tile.id] || _tileCache.inflight[tile.id]) return;
+           _lastSpace = currSpace;
+           _disableSpace = true;
+           select(window).on('keyup.space-block', function () {
+             d3_event.preventDefault();
+             d3_event.stopPropagation();
+             _disableSpace = false;
+             select(window).on('keyup.space-block', null);
+           }); // get the current mouse position
 
-                   _tileCache.toLoad[tile.id] = true;
-                   this.loadTile(tile, callback);
-               }, this);
-           },
+           var loc = context.map().mouse() || // or the map center if the mouse has never entered the map
+           context.projection(context.map().center());
+           click(d3_event, loc);
+         }
 
+         function backspace(d3_event) {
+           d3_event.preventDefault();
+           dispatch$1.call('undo');
+         }
 
-           // Load notes from the API in tiles
-           // GET /api/0.6/notes?bbox=
-           loadNotes: function(projection, noteOptions) {
-               noteOptions = Object.assign({ limit: 10000, closed: 7 }, noteOptions);
-               if (_off) return;
+         function del(d3_event) {
+           d3_event.preventDefault();
+           dispatch$1.call('cancel');
+         }
 
-               var that = this;
-               var path = '/api/0.6/notes?limit=' + noteOptions.limit + '&closed=' + noteOptions.closed + '&bbox=';
-               var throttleLoadUsers = throttle(function() {
-                   var uids = Object.keys(_userCache.toLoad);
-                   if (!uids.length) return;
-                   that.loadUsers(uids, function() {});  // eagerly load user details
-               }, 750);
-
-               // determine the needed tiles to cover the view
-               var tiles = tiler$5.zoomExtent([_noteZoom, _noteZoom]).getTiles(projection);
-
-               // abort inflight requests that are no longer needed
-               abortUnwantedRequests$3(_noteCache, tiles);
-
-               // issue new requests..
-               tiles.forEach(function(tile) {
-                   if (_noteCache.loaded[tile.id] || _noteCache.inflight[tile.id]) return;
-
-                   var options = { skipSeen: false };
-                   _noteCache.inflight[tile.id] = that.loadFromAPI(
-                       path + tile.extent.toParam(),
-                       function(err) {
-                           delete _noteCache.inflight[tile.id];
-                           if (!err) {
-                               _noteCache.loaded[tile.id] = true;
-                           }
-                           throttleLoadUsers();
-                           dispatch$6.call('loadedNotes');
-                       },
-                       options
-                   );
-               });
-           },
+         function ret(d3_event) {
+           d3_event.preventDefault();
+           dispatch$1.call('finish');
+         }
 
+         function behavior(selection) {
+           context.install(_hover);
+           context.install(_edit);
+           _downPointer = null;
+           keybinding.on('⌫', backspace).on('⌦', del).on('⎋', ret).on('↩', ret).on('space', space).on('⌥space', space);
+           selection.on('mouseenter.draw', mouseenter).on('mouseleave.draw', mouseleave).on(_pointerPrefix + 'down.draw', pointerdown).on(_pointerPrefix + 'move.draw', pointermove);
+           select(window).on(_pointerPrefix + 'up.draw', pointerup, true).on('pointercancel.draw', pointercancel, true);
+           select(document).call(keybinding);
+           return behavior;
+         }
 
-           // Create a note
-           // POST /api/0.6/notes?params
-           postNoteCreate: function(note, callback) {
-               if (!this.authenticated()) {
-                   return callback({ message: 'Not Authenticated', status: -3 }, note);
-               }
-               if (_noteCache.inflightPost[note.id]) {
-                   return callback({ message: 'Note update already inflight', status: -2 }, note);
-               }
+         behavior.off = function (selection) {
+           context.ui().sidebar.hover.cancel();
+           context.uninstall(_hover);
+           context.uninstall(_edit);
+           selection.on('mouseenter.draw', null).on('mouseleave.draw', null).on(_pointerPrefix + 'down.draw', null).on(_pointerPrefix + 'move.draw', null);
+           select(window).on(_pointerPrefix + 'up.draw', null).on('pointercancel.draw', null); // note: keyup.space-block, click.draw-block should remain
 
-               if (!note.loc[0] || !note.loc[1] || !note.newComment) return; // location & description required
+           select(document).call(keybinding.unbind);
+         };
 
-               var comment = note.newComment;
-               if (note.newCategory && note.newCategory !== 'None') { comment += ' #' + note.newCategory; }
+         behavior.hover = function () {
+           return _hover;
+         };
 
-               var path = '/api/0.6/notes?' + utilQsString({ lon: note.loc[0], lat: note.loc[1], text: comment });
+         return utilRebind(behavior, dispatch$1, 'on');
+       }
 
-               _noteCache.inflightPost[note.id] = oauth.xhr(
-                   { method: 'POST', path: path },
-                   wrapcb(this, done, _connectionID)
-               );
+       function initRange(domain, range) {
+         switch (arguments.length) {
+           case 0:
+             break;
 
+           case 1:
+             this.range(domain);
+             break;
 
-               function done(err, xml) {
-                   delete _noteCache.inflightPost[note.id];
-                   if (err) { return callback(err); }
+           default:
+             this.range(range).domain(domain);
+             break;
+         }
 
-                   // we get the updated note back, remove from caches and reparse..
-                   this.removeNote(note);
+         return this;
+       }
 
-                   var options = { skipSeen: false };
-                   return parseXML(xml, function(err, results) {
-                       if (err) {
-                           return callback(err);
-                       } else {
-                           return callback(undefined, results[0]);
-                       }
-                   }, options);
-               }
-           },
+       function constants(x) {
+         return function () {
+           return x;
+         };
+       }
 
+       function number$1(x) {
+         return +x;
+       }
 
-           // Update a note
-           // POST /api/0.6/notes/#id/comment?text=comment
-           // POST /api/0.6/notes/#id/close?text=comment
-           // POST /api/0.6/notes/#id/reopen?text=comment
-           postNoteUpdate: function(note, newStatus, callback) {
-               if (!this.authenticated()) {
-                   return callback({ message: 'Not Authenticated', status: -3 }, note);
-               }
-               if (_noteCache.inflightPost[note.id]) {
-                   return callback({ message: 'Note update already inflight', status: -2 }, note);
-               }
+       var unit = [0, 1];
+       function identity$3(x) {
+         return x;
+       }
 
-               var action;
-               if (note.status !== 'closed' && newStatus === 'closed') {
-                   action = 'close';
-               } else if (note.status !== 'open' && newStatus === 'open') {
-                   action = 'reopen';
-               } else {
-                   action = 'comment';
-                   if (!note.newComment) return; // when commenting, comment required
-               }
+       function normalize$1(a, b) {
+         return (b -= a = +a) ? function (x) {
+           return (x - a) / b;
+         } : constants(isNaN(b) ? NaN : 0.5);
+       }
 
-               var path = '/api/0.6/notes/' + note.id + '/' + action;
-               if (note.newComment) {
-                   path += '?' + utilQsString({ text: note.newComment });
-               }
+       function clamper(a, b) {
+         var t;
+         if (a > b) t = a, a = b, b = t;
+         return function (x) {
+           return Math.max(a, Math.min(b, x));
+         };
+       } // normalize(a, b)(x) takes a domain value x in [a,b] and returns the corresponding parameter t in [0,1].
+       // interpolate(a, b)(t) takes a parameter t in [0,1] and returns the corresponding range value x in [a,b].
 
-               _noteCache.inflightPost[note.id] = oauth.xhr(
-                   { method: 'POST', path: path },
-                   wrapcb(this, done, _connectionID)
-               );
 
+       function bimap(domain, range, interpolate) {
+         var d0 = domain[0],
+             d1 = domain[1],
+             r0 = range[0],
+             r1 = range[1];
+         if (d1 < d0) d0 = normalize$1(d1, d0), r0 = interpolate(r1, r0);else d0 = normalize$1(d0, d1), r0 = interpolate(r0, r1);
+         return function (x) {
+           return r0(d0(x));
+         };
+       }
 
-               function done(err, xml) {
-                   delete _noteCache.inflightPost[note.id];
-                   if (err) { return callback(err); }
+       function polymap(domain, range, interpolate) {
+         var j = Math.min(domain.length, range.length) - 1,
+             d = new Array(j),
+             r = new Array(j),
+             i = -1; // Reverse descending domains.
 
-                   // we get the updated note back, remove from caches and reparse..
-                   this.removeNote(note);
+         if (domain[j] < domain[0]) {
+           domain = domain.slice().reverse();
+           range = range.slice().reverse();
+         }
 
-                   // update closed note cache - used to populate `closed:note` changeset tag
-                   if (action === 'close') {
-                       _noteCache.closed[note.id] = true;
-                   } else if (action === 'reopen') {
-                       delete _noteCache.closed[note.id];
-                   }
+         while (++i < j) {
+           d[i] = normalize$1(domain[i], domain[i + 1]);
+           r[i] = interpolate(range[i], range[i + 1]);
+         }
 
-                   var options = { skipSeen: false };
-                   return parseXML(xml, function(err, results) {
-                       if (err) {
-                           return callback(err);
-                       } else {
-                           return callback(undefined, results[0]);
-                       }
-                   }, options);
-               }
-           },
+         return function (x) {
+           var i = bisectRight(domain, x, 1, j) - 1;
+           return r[i](d[i](x));
+         };
+       }
 
+       function copy(source, target) {
+         return target.domain(source.domain()).range(source.range()).interpolate(source.interpolate()).clamp(source.clamp()).unknown(source.unknown());
+       }
+       function transformer$1() {
+         var domain = unit,
+             range = unit,
+             interpolate$1 = interpolate,
+             transform,
+             untransform,
+             unknown,
+             clamp = identity$3,
+             piecewise,
+             output,
+             input;
 
-           switch: function(options) {
-               urlroot = options.urlroot;
+         function rescale() {
+           var n = Math.min(domain.length, range.length);
+           if (clamp !== identity$3) clamp = clamper(domain[0], domain[n - 1]);
+           piecewise = n > 2 ? polymap : bimap;
+           output = input = null;
+           return scale;
+         }
 
-               oauth.options(Object.assign({
-                   url: urlroot,
-                   loading: authLoading,
-                   done: authDone
-               }, options));
+         function scale(x) {
+           return isNaN(x = +x) ? unknown : (output || (output = piecewise(domain.map(transform), range, interpolate$1)))(transform(clamp(x)));
+         }
 
-               this.reset();
-               this.userChangesets(function() {});  // eagerly load user details/changesets
-               dispatch$6.call('change');
-               return this;
-           },
+         scale.invert = function (y) {
+           return clamp(untransform((input || (input = piecewise(range, domain.map(transform), d3_interpolateNumber)))(y)));
+         };
 
+         scale.domain = function (_) {
+           return arguments.length ? (domain = Array.from(_, number$1), rescale()) : domain.slice();
+         };
 
-           toggle: function(val) {
-               _off = !val;
-               return this;
-           },
+         scale.range = function (_) {
+           return arguments.length ? (range = Array.from(_), rescale()) : range.slice();
+         };
 
+         scale.rangeRound = function (_) {
+           return range = Array.from(_), interpolate$1 = interpolateRound, rescale();
+         };
 
-           isChangesetInflight: function() {
-               return !!_changeset.inflight;
-           },
+         scale.clamp = function (_) {
+           return arguments.length ? (clamp = _ ? true : identity$3, rescale()) : clamp !== identity$3;
+         };
 
+         scale.interpolate = function (_) {
+           return arguments.length ? (interpolate$1 = _, rescale()) : interpolate$1;
+         };
 
-           // get/set cached data
-           // This is used to save/restore the state when entering/exiting the walkthrough
-           // Also used for testing purposes.
-           caches: function(obj) {
-               function cloneCache(source) {
-                   var target = {};
-                   Object.keys(source).forEach(function(k) {
-                       if (k === 'rtree') {
-                           target.rtree = new RBush().fromJSON(source.rtree.toJSON());  // clone rbush
-                       } else if (k === 'note') {
-                           target.note = {};
-                           Object.keys(source.note).forEach(function(id) {
-                               target.note[id] = osmNote(source.note[id]);   // copy notes
-                           });
-                       } else {
-                           target[k] = JSON.parse(JSON.stringify(source[k]));   // clone deep
-                       }
-                   });
-                   return target;
-               }
+         scale.unknown = function (_) {
+           return arguments.length ? (unknown = _, scale) : unknown;
+         };
 
-               if (!arguments.length) {
-                   return {
-                       tile: cloneCache(_tileCache),
-                       note: cloneCache(_noteCache),
-                       user: cloneCache(_userCache)
-                   };
-               }
+         return function (t, u) {
+           transform = t, untransform = u;
+           return rescale();
+         };
+       }
+       function continuous() {
+         return transformer$1()(identity$3, identity$3);
+       }
 
-               // access caches directly for testing (e.g., loading notes rtree)
-               if (obj === 'get') {
-                   return {
-                       tile: _tileCache,
-                       note: _noteCache,
-                       user: _userCache
-                   };
-               }
+       function formatDecimal (x) {
+         return Math.abs(x = Math.round(x)) >= 1e21 ? x.toLocaleString("en").replace(/,/g, "") : x.toString(10);
+       } // Computes the decimal coefficient and exponent of the specified number x with
+       // significant digits p, where x is positive and p is in [1, 21] or undefined.
+       // For example, formatDecimalParts(1.23) returns ["123", 0].
 
-               if (obj.tile) {
-                   _tileCache = obj.tile;
-                   _tileCache.inflight = {};
-               }
-               if (obj.note) {
-                   _noteCache = obj.note;
-                   _noteCache.inflight = {};
-                   _noteCache.inflightPost = {};
-               }
-               if (obj.user) {
-                   _userCache = obj.user;
-               }
+       function formatDecimalParts(x, p) {
+         if ((i = (x = p ? x.toExponential(p - 1) : x.toExponential()).indexOf("e")) < 0) return null; // NaN, ±Infinity
 
-               return this;
-           },
+         var i,
+             coefficient = x.slice(0, i); // The string returned by toExponential either has the form \d\.\d+e[-+]\d+
+         // (e.g., 1.2e+3) or the form \de[-+]\d+ (e.g., 1e+3).
 
+         return [coefficient.length > 1 ? coefficient[0] + coefficient.slice(2) : coefficient, +x.slice(i + 1)];
+       }
 
-           logout: function() {
-               _userChangesets = undefined;
-               _userDetails = undefined;
-               oauth.logout();
-               dispatch$6.call('change');
-               return this;
-           },
+       function exponent (x) {
+         return x = formatDecimalParts(Math.abs(x)), x ? x[1] : NaN;
+       }
 
+       function formatGroup (grouping, thousands) {
+         return function (value, width) {
+           var i = value.length,
+               t = [],
+               j = 0,
+               g = grouping[0],
+               length = 0;
 
-           authenticated: function() {
-               return oauth.authenticated();
-           },
+           while (i > 0 && g > 0) {
+             if (length + g + 1 > width) g = Math.max(1, width - length);
+             t.push(value.substring(i -= g, i + g));
+             if ((length += g + 1) > width) break;
+             g = grouping[j = (j + 1) % grouping.length];
+           }
 
+           return t.reverse().join(thousands);
+         };
+       }
 
-           authenticate: function(callback) {
-               var that = this;
-               var cid = _connectionID;
-               _userChangesets = undefined;
-               _userDetails = undefined;
+       function formatNumerals (numerals) {
+         return function (value) {
+           return value.replace(/[0-9]/g, function (i) {
+             return numerals[+i];
+           });
+         };
+       }
 
-               function done(err, res) {
-                   if (err) {
-                       if (callback) callback(err);
-                       return;
-                   }
-                   if (that.getConnectionId() !== cid) {
-                       if (callback) callback({ message: 'Connection Switched', status: -1 });
-                       return;
-                   }
-                   _rateLimitError = undefined;
-                   dispatch$6.call('change');
-                   if (callback) callback(err, res);
-                   that.userChangesets(function() {});  // eagerly load user details/changesets
-               }
+       // [[fill]align][sign][symbol][0][width][,][.precision][~][type]
+       var re = /^(?:(.)?([<>=^]))?([+\-( ])?([$#])?(0)?(\d+)?(,)?(\.\d+)?(~)?([a-z%])?$/i;
+       function formatSpecifier(specifier) {
+         if (!(match = re.exec(specifier))) throw new Error("invalid format: " + specifier);
+         var match;
+         return new FormatSpecifier({
+           fill: match[1],
+           align: match[2],
+           sign: match[3],
+           symbol: match[4],
+           zero: match[5],
+           width: match[6],
+           comma: match[7],
+           precision: match[8] && match[8].slice(1),
+           trim: match[9],
+           type: match[10]
+         });
+       }
+       formatSpecifier.prototype = FormatSpecifier.prototype; // instanceof
 
-               return oauth.authenticate(done);
-           },
+       function FormatSpecifier(specifier) {
+         this.fill = specifier.fill === undefined ? " " : specifier.fill + "";
+         this.align = specifier.align === undefined ? ">" : specifier.align + "";
+         this.sign = specifier.sign === undefined ? "-" : specifier.sign + "";
+         this.symbol = specifier.symbol === undefined ? "" : specifier.symbol + "";
+         this.zero = !!specifier.zero;
+         this.width = specifier.width === undefined ? undefined : +specifier.width;
+         this.comma = !!specifier.comma;
+         this.precision = specifier.precision === undefined ? undefined : +specifier.precision;
+         this.trim = !!specifier.trim;
+         this.type = specifier.type === undefined ? "" : specifier.type + "";
+       }
 
+       FormatSpecifier.prototype.toString = function () {
+         return this.fill + this.align + this.sign + this.symbol + (this.zero ? "0" : "") + (this.width === undefined ? "" : Math.max(1, this.width | 0)) + (this.comma ? "," : "") + (this.precision === undefined ? "" : "." + Math.max(0, this.precision | 0)) + (this.trim ? "~" : "") + this.type;
+       };
 
-           imageryBlacklists: function() {
-               return _blacklists;
-           },
+       // Trims insignificant zeros, e.g., replaces 1.2000k with 1.2k.
+       function formatTrim (s) {
+         out: for (var n = s.length, i = 1, i0 = -1, i1; i < n; ++i) {
+           switch (s[i]) {
+             case ".":
+               i0 = i1 = i;
+               break;
 
+             case "0":
+               if (i0 === 0) i0 = i;
+               i1 = i;
+               break;
 
-           tileZoom: function(val) {
-               if (!arguments.length) return _tileZoom$3;
-               _tileZoom$3 = val;
-               return this;
-           },
+             default:
+               if (!+s[i]) break out;
+               if (i0 > 0) i0 = 0;
+               break;
+           }
+         }
 
+         return i0 > 0 ? s.slice(0, i0) + s.slice(i1 + 1) : s;
+       }
 
-           // get all cached notes covering the viewport
-           notes: function(projection) {
-               var viewport = projection.clipExtent();
-               var min = [viewport[0][0], viewport[1][1]];
-               var max = [viewport[1][0], viewport[0][1]];
-               var bbox = geoExtent(projection.invert(min), projection.invert(max)).bbox();
+       // `thisNumberValue` abstract operation
+       // https://tc39.github.io/ecma262/#sec-thisnumbervalue
+       var thisNumberValue = function (value) {
+         if (typeof value != 'number' && classofRaw(value) != 'Number') {
+           throw TypeError('Incorrect invocation');
+         }
+         return +value;
+       };
 
-               return _noteCache.rtree.search(bbox)
-                   .map(function(d) { return d.data; });
-           },
+       // `String.prototype.repeat` method implementation
+       // https://tc39.github.io/ecma262/#sec-string.prototype.repeat
+       var stringRepeat = ''.repeat || function repeat(count) {
+         var str = String(requireObjectCoercible(this));
+         var result = '';
+         var n = toInteger(count);
+         if (n < 0 || n == Infinity) throw RangeError('Wrong number of repetitions');
+         for (;n > 0; (n >>>= 1) && (str += str)) if (n & 1) result += str;
+         return result;
+       };
 
+       var nativeToFixed = 1.0.toFixed;
+       var floor$6 = Math.floor;
 
-           // get a single note from the cache
-           getNote: function(id) {
-               return _noteCache.note[id];
-           },
+       var pow$2 = function (x, n, acc) {
+         return n === 0 ? acc : n % 2 === 1 ? pow$2(x, n - 1, acc * x) : pow$2(x * x, n / 2, acc);
+       };
 
+       var log$2 = function (x) {
+         var n = 0;
+         var x2 = x;
+         while (x2 >= 4096) {
+           n += 12;
+           x2 /= 4096;
+         }
+         while (x2 >= 2) {
+           n += 1;
+           x2 /= 2;
+         } return n;
+       };
 
-           // remove a single note from the cache
-           removeNote: function(note) {
-               if (!(note instanceof osmNote) || !note.id) return;
+       var FORCED$c = nativeToFixed && (
+         0.00008.toFixed(3) !== '0.000' ||
+         0.9.toFixed(0) !== '1' ||
+         1.255.toFixed(2) !== '1.25' ||
+         1000000000000000128.0.toFixed(0) !== '1000000000000000128'
+       ) || !fails(function () {
+         // V8 ~ Android 4.3-
+         nativeToFixed.call({});
+       });
 
-               delete _noteCache.note[note.id];
-               updateRtree$3(encodeNoteRtree(note), false);  // false = remove
-           },
+       // `Number.prototype.toFixed` method
+       // https://tc39.github.io/ecma262/#sec-number.prototype.tofixed
+       _export({ target: 'Number', proto: true, forced: FORCED$c }, {
+         // eslint-disable-next-line max-statements
+         toFixed: function toFixed(fractionDigits) {
+           var number = thisNumberValue(this);
+           var fractDigits = toInteger(fractionDigits);
+           var data = [0, 0, 0, 0, 0, 0];
+           var sign = '';
+           var result = '0';
+           var e, z, j, k;
+
+           var multiply = function (n, c) {
+             var index = -1;
+             var c2 = c;
+             while (++index < 6) {
+               c2 += n * data[index];
+               data[index] = c2 % 1e7;
+               c2 = floor$6(c2 / 1e7);
+             }
+           };
+
+           var divide = function (n) {
+             var index = 6;
+             var c = 0;
+             while (--index >= 0) {
+               c += data[index];
+               data[index] = floor$6(c / n);
+               c = (c % n) * 1e7;
+             }
+           };
+
+           var dataToString = function () {
+             var index = 6;
+             var s = '';
+             while (--index >= 0) {
+               if (s !== '' || index === 0 || data[index] !== 0) {
+                 var t = String(data[index]);
+                 s = s === '' ? t : s + stringRepeat.call('0', 7 - t.length) + t;
+               }
+             } return s;
+           };
+
+           if (fractDigits < 0 || fractDigits > 20) throw RangeError('Incorrect fraction digits');
+           // eslint-disable-next-line no-self-compare
+           if (number != number) return 'NaN';
+           if (number <= -1e21 || number >= 1e21) return String(number);
+           if (number < 0) {
+             sign = '-';
+             number = -number;
+           }
+           if (number > 1e-21) {
+             e = log$2(number * pow$2(2, 69, 1)) - 69;
+             z = e < 0 ? number * pow$2(2, -e, 1) : number / pow$2(2, e, 1);
+             z *= 0x10000000000000;
+             e = 52 - e;
+             if (e > 0) {
+               multiply(0, z);
+               j = fractDigits;
+               while (j >= 7) {
+                 multiply(1e7, 0);
+                 j -= 7;
+               }
+               multiply(pow$2(10, j, 1), 0);
+               j = e - 1;
+               while (j >= 23) {
+                 divide(1 << 23);
+                 j -= 23;
+               }
+               divide(1 << j);
+               multiply(1, 1);
+               divide(2);
+               result = dataToString();
+             } else {
+               multiply(0, z);
+               multiply(1 << -e, 0);
+               result = dataToString() + stringRepeat.call('0', fractDigits);
+             }
+           }
+           if (fractDigits > 0) {
+             k = result.length;
+             result = sign + (k <= fractDigits
+               ? '0.' + stringRepeat.call('0', fractDigits - k) + result
+               : result.slice(0, k - fractDigits) + '.' + result.slice(k - fractDigits));
+           } else {
+             result = sign + result;
+           } return result;
+         }
+       });
 
+       var nativeToPrecision = 1.0.toPrecision;
 
-           // replace a single note in the cache
-           replaceNote: function(note) {
-               if (!(note instanceof osmNote) || !note.id) return;
+       var FORCED$d = fails(function () {
+         // IE7-
+         return nativeToPrecision.call(1, undefined) !== '1';
+       }) || !fails(function () {
+         // V8 ~ Android 4.3-
+         nativeToPrecision.call({});
+       });
 
-               _noteCache.note[note.id] = note;
-               updateRtree$3(encodeNoteRtree(note), true);  // true = replace
-               return note;
-           },
+       // `Number.prototype.toPrecision` method
+       // https://tc39.github.io/ecma262/#sec-number.prototype.toprecision
+       _export({ target: 'Number', proto: true, forced: FORCED$d }, {
+         toPrecision: function toPrecision(precision) {
+           return precision === undefined
+             ? nativeToPrecision.call(thisNumberValue(this))
+             : nativeToPrecision.call(thisNumberValue(this), precision);
+         }
+       });
 
+       var prefixExponent;
+       function formatPrefixAuto (x, p) {
+         var d = formatDecimalParts(x, p);
+         if (!d) return x + "";
+         var coefficient = d[0],
+             exponent = d[1],
+             i = exponent - (prefixExponent = Math.max(-8, Math.min(8, Math.floor(exponent / 3))) * 3) + 1,
+             n = coefficient.length;
+         return i === n ? coefficient : i > n ? coefficient + new Array(i - n + 1).join("0") : i > 0 ? coefficient.slice(0, i) + "." + coefficient.slice(i) : "0." + new Array(1 - i).join("0") + formatDecimalParts(x, Math.max(0, p + i - 1))[0]; // less than 1y!
+       }
 
-           // Get an array of note IDs closed during this session.
-           // Used to populate `closed:note` changeset tag
-           getClosedIDs: function() {
-               return Object.keys(_noteCache.closed).sort();
-           }
+       function formatRounded (x, p) {
+         var d = formatDecimalParts(x, p);
+         if (!d) return x + "";
+         var coefficient = d[0],
+             exponent = d[1];
+         return exponent < 0 ? "0." + new Array(-exponent).join("0") + coefficient : coefficient.length > exponent + 1 ? coefficient.slice(0, exponent + 1) + "." + coefficient.slice(exponent + 1) : coefficient + new Array(exponent - coefficient.length + 2).join("0");
+       }
 
+       var formatTypes = {
+         "%": function _(x, p) {
+           return (x * 100).toFixed(p);
+         },
+         "b": function b(x) {
+           return Math.round(x).toString(2);
+         },
+         "c": function c(x) {
+           return x + "";
+         },
+         "d": formatDecimal,
+         "e": function e(x, p) {
+           return x.toExponential(p);
+         },
+         "f": function f(x, p) {
+           return x.toFixed(p);
+         },
+         "g": function g(x, p) {
+           return x.toPrecision(p);
+         },
+         "o": function o(x) {
+           return Math.round(x).toString(8);
+         },
+         "p": function p(x, _p) {
+           return formatRounded(x * 100, _p);
+         },
+         "r": formatRounded,
+         "s": formatPrefixAuto,
+         "X": function X(x) {
+           return Math.round(x).toString(16).toUpperCase();
+         },
+         "x": function x(_x) {
+           return Math.round(_x).toString(16);
+         }
        };
 
-       var apibase$3 = 'https://wiki.openstreetmap.org/w/api.php';
-       var _inflight$1 = {};
-       var _wikibaseCache = {};
-       var _localeIDs = { en: false };
+       function identity$4 (x) {
+         return x;
+       }
+
+       var map = Array.prototype.map,
+           prefixes = ["y", "z", "a", "f", "p", "n", "µ", "m", "", "k", "M", "G", "T", "P", "E", "Z", "Y"];
+       function formatLocale (locale) {
+         var group = locale.grouping === undefined || locale.thousands === undefined ? identity$4 : formatGroup(map.call(locale.grouping, Number), locale.thousands + ""),
+             currencyPrefix = locale.currency === undefined ? "" : locale.currency[0] + "",
+             currencySuffix = locale.currency === undefined ? "" : locale.currency[1] + "",
+             decimal = locale.decimal === undefined ? "." : locale.decimal + "",
+             numerals = locale.numerals === undefined ? identity$4 : formatNumerals(map.call(locale.numerals, String)),
+             percent = locale.percent === undefined ? "%" : locale.percent + "",
+             minus = locale.minus === undefined ? "−" : locale.minus + "",
+             nan = locale.nan === undefined ? "NaN" : locale.nan + "";
 
+         function newFormat(specifier) {
+           specifier = formatSpecifier(specifier);
+           var fill = specifier.fill,
+               align = specifier.align,
+               sign = specifier.sign,
+               symbol = specifier.symbol,
+               zero = specifier.zero,
+               width = specifier.width,
+               comma = specifier.comma,
+               precision = specifier.precision,
+               trim = specifier.trim,
+               type = specifier.type; // The "n" type is an alias for ",g".
 
-       var debouncedRequest = debounce(request, 500, { leading: false });
+           if (type === "n") comma = true, type = "g"; // The "" type, and any invalid type, is an alias for ".12~g".
+           else if (!formatTypes[type]) precision === undefined && (precision = 12), trim = true, type = "g"; // If zero fill is specified, padding goes after sign and before digits.
 
-       function request(url, callback) {
-           if (_inflight$1[url]) return;
-           var controller = new AbortController();
-           _inflight$1[url] = controller;
+           if (zero || fill === "0" && align === "=") zero = true, fill = "0", align = "="; // Compute the prefix and suffix.
+           // For SI-prefix, the suffix is lazily computed.
 
-           d3_json(url, { signal: controller.signal })
-               .then(function(result) {
-                   delete _inflight$1[url];
-                   if (callback) callback(null, result);
-               })
-               .catch(function(err) {
-                   delete _inflight$1[url];
-                   if (err.name === 'AbortError') return;
-                   if (callback) callback(err.message);
-               });
-       }
+           var prefix = symbol === "$" ? currencyPrefix : symbol === "#" && /[boxX]/.test(type) ? "0" + type.toLowerCase() : "",
+               suffix = symbol === "$" ? currencySuffix : /[%p]/.test(type) ? percent : ""; // What format function should we use?
+           // Is this an integer type?
+           // Can this type generate exponential notation?
+
+           var formatType = formatTypes[type],
+               maybeSuffix = /[defgprs%]/.test(type); // Set the default precision if not specified,
+           // or clamp the specified precision to the supported range.
+           // For significant precision, it must be in [1, 21].
+           // For fixed precision, it must be in [0, 20].
 
+           precision = precision === undefined ? 6 : /[gprs]/.test(type) ? Math.max(1, Math.min(21, precision)) : Math.max(0, Math.min(20, precision));
 
-       /**
-        * Get the best string value from the descriptions/labels result
-        * Note that if mediawiki doesn't recognize language code, it will return all values.
-        * In that case, fallback to use English.
-        * @param values object - either descriptions or labels
-        * @param langCode String
-        * @returns localized string
-        */
-       function localizedToString(values, langCode) {
-           if (values) {
-               values = values[langCode] || values.en;
-           }
-           return values ? values.value : '';
-       }
+           function format(value) {
+             var valuePrefix = prefix,
+                 valueSuffix = suffix,
+                 i,
+                 n,
+                 c;
 
+             if (type === "c") {
+               valueSuffix = formatType(value) + valueSuffix;
+               value = "";
+             } else {
+               value = +value; // Determine the sign. -0 is not less than 0, but 1 / -0 is!
 
-       var serviceOsmWikibase = {
+               var valueNegative = value < 0 || 1 / value < 0; // Perform the initial formatting.
 
-           init: function() {
-               _inflight$1 = {};
-               _wikibaseCache = {};
-               _localeIDs = {};
-           },
+               value = isNaN(value) ? nan : formatType(Math.abs(value), precision); // Trim insignificant zeros.
 
+               if (trim) value = formatTrim(value); // If a negative value rounds to zero after formatting, and no explicit positive sign is requested, hide the sign.
 
-           reset: function() {
-               Object.values(_inflight$1).forEach(function(controller) { controller.abort(); });
-               _inflight$1 = {};
-           },
+               if (valueNegative && +value === 0 && sign !== "+") valueNegative = false; // Compute the prefix and suffix.
 
+               valuePrefix = (valueNegative ? sign === "(" ? sign : minus : sign === "-" || sign === "(" ? "" : sign) + valuePrefix;
+               valueSuffix = (type === "s" ? prefixes[8 + prefixExponent / 3] : "") + valueSuffix + (valueNegative && sign === "(" ? ")" : ""); // Break the formatted value into the integer “value” part that can be
+               // grouped, and fractional or exponential “suffix” part that is not.
 
-           /**
-            * Get the best value for the property, or undefined if not found
-            * @param entity object from wikibase
-            * @param property string e.g. 'P4' for image
-            * @param langCode string e.g. 'fr' for French
-            */
-           claimToValue: function(entity, property, langCode) {
-               if (!entity.claims[property]) return undefined;
-               var locale = _localeIDs[langCode];
-               var preferredPick, localePick;
-
-               entity.claims[property].forEach(function(stmt) {
-                   // If exists, use value limited to the needed language (has a qualifier P26 = locale)
-                   // Or if not found, use the first value with the "preferred" rank
-                   if (!preferredPick && stmt.rank === 'preferred') {
-                       preferredPick = stmt;
-                   }
-                   if (locale && stmt.qualifiers && stmt.qualifiers.P26 &&
-                       stmt.qualifiers.P26[0].datavalue.value.id === locale
-                   ) {
-                       localePick = stmt;
-                   }
-               });
+               if (maybeSuffix) {
+                 i = -1, n = value.length;
 
-               var result = localePick || preferredPick;
-               if (result) {
-                   var datavalue = result.mainsnak.datavalue;
-                   return datavalue.type === 'wikibase-entityid' ? datavalue.value.id : datavalue.value;
-               } else {
-                   return undefined;
+                 while (++i < n) {
+                   if (c = value.charCodeAt(i), 48 > c || c > 57) {
+                     valueSuffix = (c === 46 ? decimal + value.slice(i + 1) : value.slice(i)) + valueSuffix;
+                     value = value.slice(0, i);
+                     break;
+                   }
+                 }
                }
-           },
+             } // If the fill character is not "0", grouping is applied before padding.
 
 
-           /**
-            * Convert monolingual property into a key-value object (language -> value)
-            * @param entity object from wikibase
-            * @param property string e.g. 'P31' for monolingual wiki page title
-            */
-           monolingualClaimToValueObj: function(entity, property) {
-               if (!entity || !entity.claims[property]) return undefined;
-
-               return entity.claims[property].reduce(function(acc, obj) {
-                   var value = obj.mainsnak.datavalue.value;
-                   acc[value.language] = value.text;
-                   return acc;
-               }, {});
-           },
+             if (comma && !zero) value = group(value, Infinity); // Compute the padding.
 
+             var length = valuePrefix.length + value.length + valueSuffix.length,
+                 padding = length < width ? new Array(width - length + 1).join(fill) : ""; // If the fill character is "0", grouping is applied after padding.
 
-           toSitelink: function(key, value) {
-               var result = value ? ('Tag:' + key + '=' + value) : 'Key:' + key;
-               return result.replace(/_/g, ' ').trim();
-           },
+             if (comma && zero) value = group(padding + value, padding.length ? width - valueSuffix.length : Infinity), padding = ""; // Reconstruct the final output based on the desired alignment.
 
+             switch (align) {
+               case "<":
+                 value = valuePrefix + value + valueSuffix + padding;
+                 break;
 
-           //
-           // Pass params object of the form:
-           // {
-           //   key: 'string',
-           //   value: 'string',
-           //   rtype: 'string',
-           //   langCode: 'string'
-           // }
-           //
-           getEntity: function(params, callback) {
-               var doRequest = params.debounce ? debouncedRequest : request;
-               var that = this;
-               var titles = [];
-               var result = {};
-               var rtypeSitelink = params.rtype ? ('Relation:' + params.rtype).replace(/_/g, ' ').trim() : false;
-               var keySitelink = params.key ? this.toSitelink(params.key) : false;
-               var tagSitelink = (params.key && params.value) ? this.toSitelink(params.key, params.value) : false;
-               var localeSitelink;
-
-               if (params.langCode && _localeIDs[params.langCode] === undefined) {
-                   // If this is the first time we are asking about this locale,
-                   // fetch corresponding entity (if it exists), and cache it.
-                   // If there is no such entry, cache `false` value to avoid re-requesting it.
-                   localeSitelink = ('Locale:' + params.langCode).replace(/_/g, ' ').trim();
-                   titles.push(localeSitelink);
-               }
-
-               if (rtypeSitelink) {
-                   if (_wikibaseCache[rtypeSitelink]) {
-                       result.rtype = _wikibaseCache[rtypeSitelink];
-                   } else {
-                       titles.push(rtypeSitelink);
-                   }
-               }
+               case "=":
+                 value = valuePrefix + padding + value + valueSuffix;
+                 break;
 
-               if (keySitelink) {
-                   if (_wikibaseCache[keySitelink]) {
-                       result.key = _wikibaseCache[keySitelink];
-                   } else {
-                       titles.push(keySitelink);
-                   }
-               }
+               case "^":
+                 value = padding.slice(0, length = padding.length >> 1) + valuePrefix + value + valueSuffix + padding.slice(length);
+                 break;
 
-               if (tagSitelink) {
-                   if (_wikibaseCache[tagSitelink]) {
-                       result.tag = _wikibaseCache[tagSitelink];
-                   } else {
-                       titles.push(tagSitelink);
-                   }
-               }
+               default:
+                 value = padding + valuePrefix + value + valueSuffix;
+                 break;
+             }
 
-               if (!titles.length) {
-                   // Nothing to do, we already had everything in the cache
-                   return callback(null, result);
-               }
-
-               // Requesting just the user language code
-               // If backend recognizes the code, it will perform proper fallbacks,
-               // and the result will contain the requested code. If not, all values are returned:
-               // {"zh-tw":{"value":"...","language":"zh-tw","source-language":"zh-hant"}
-               // {"pt-br":{"value":"...","language":"pt","for-language":"pt-br"}}
-               var obj = {
-                   action: 'wbgetentities',
-                   sites: 'wiki',
-                   titles: titles.join('|'),
-                   languages: params.langCode,
-                   languagefallback: 1,
-                   origin: '*',
-                   format: 'json',
-                   // There is an MW Wikibase API bug https://phabricator.wikimedia.org/T212069
-                   // We shouldn't use v1 until it gets fixed, but should switch to it afterwards
-                   // formatversion: 2,
-               };
+             return numerals(value);
+           }
 
-               var url = apibase$3 + '?' + utilQsString(obj);
-               doRequest(url, function(err, d) {
-                   if (err) {
-                       callback(err);
-                   } else if (!d.success || d.error) {
-                       callback(d.error.messages.map(function(v) { return v.html['*']; }).join('<br>'));
-                   } else {
-                       var localeID = false;
-                       Object.values(d.entities).forEach(function(res) {
-                           if (res.missing !== '') {
-                               // Simplify access to the localized values
-                               res.description = localizedToString(res.descriptions, params.langCode);
-                               res.label = localizedToString(res.labels, params.langCode);
-
-                               var title = res.sitelinks.wiki.title;
-                               if (title === rtypeSitelink) {
-                                   _wikibaseCache[rtypeSitelink] = res;
-                                   result.rtype = res;
-                               } else if (title === keySitelink) {
-                                   _wikibaseCache[keySitelink] = res;
-                                   result.key = res;
-                               } else if (title === tagSitelink) {
-                                   _wikibaseCache[tagSitelink] = res;
-                                   result.tag = res;
-                               } else if (title === localeSitelink) {
-                                   localeID = res.id;
-                               } else {
-                                   console.log('Unexpected title ' + title);  // eslint-disable-line no-console
-                               }
-                           }
-                       });
+           format.toString = function () {
+             return specifier + "";
+           };
 
-                       if (localeSitelink) {
-                           // If locale ID is not found, store false to prevent repeated queries
-                           that.addLocale(params.langCode, localeID);
-                       }
+           return format;
+         }
+
+         function formatPrefix(specifier, value) {
+           var f = newFormat((specifier = formatSpecifier(specifier), specifier.type = "f", specifier)),
+               e = Math.max(-8, Math.min(8, Math.floor(exponent(value) / 3))) * 3,
+               k = Math.pow(10, -e),
+               prefix = prefixes[8 + e / 3];
+           return function (value) {
+             return f(k * value) + prefix;
+           };
+         }
+
+         return {
+           format: newFormat,
+           formatPrefix: formatPrefix
+         };
+       }
+
+       var locale;
+       var format;
+       var formatPrefix;
+       defaultLocale({
+         thousands: ",",
+         grouping: [3],
+         currency: ["$", ""]
+       });
+       function defaultLocale(definition) {
+         locale = formatLocale(definition);
+         format = locale.format;
+         formatPrefix = locale.formatPrefix;
+         return locale;
+       }
+
+       function precisionFixed (step) {
+         return Math.max(0, -exponent(Math.abs(step)));
+       }
 
-                       callback(null, result);
-                   }
-               });
-           },
+       function precisionPrefix (step, value) {
+         return Math.max(0, Math.max(-8, Math.min(8, Math.floor(exponent(value) / 3))) * 3 - exponent(Math.abs(step)));
+       }
 
+       function precisionRound (step, max) {
+         step = Math.abs(step), max = Math.abs(max) - step;
+         return Math.max(0, exponent(max) - exponent(step)) + 1;
+       }
 
-           //
-           // Pass params object of the form:
-           // {
-           //   key: 'string',     // required
-           //   value: 'string'    // optional
-           // }
-           //   -or-
-           // {
-           //   rtype: 'rtype'     // relation type  (e.g. 'multipolygon')
-           // }
-           //
-           // Get an result object used to display tag documentation
-           // {
-           //   title:        'string',
-           //   description:  'string',
-           //   editURL:      'string',
-           //   imageURL:     'string',
-           //   wiki:         { title: 'string', text: 'string', url: 'string' }
-           // }
-           //
-           getDocs: function(params, callback) {
-               var that = this;
-               var langCode = _mainLocalizer.localeCode().toLowerCase();
-               params.langCode = langCode;
+       function tickFormat(start, stop, count, specifier) {
+         var step = tickStep(start, stop, count),
+             precision;
+         specifier = formatSpecifier(specifier == null ? ",f" : specifier);
 
-               this.getEntity(params, function(err, data) {
-                   if (err) {
-                       callback(err);
-                       return;
-                   }
+         switch (specifier.type) {
+           case "s":
+             {
+               var value = Math.max(Math.abs(start), Math.abs(stop));
+               if (specifier.precision == null && !isNaN(precision = precisionPrefix(step, value))) specifier.precision = precision;
+               return formatPrefix(specifier, value);
+             }
 
-                   var entity = data.rtype || data.tag || data.key;
-                   if (!entity) {
-                       callback('No entity');
-                       return;
-                   }
+           case "":
+           case "e":
+           case "g":
+           case "p":
+           case "r":
+             {
+               if (specifier.precision == null && !isNaN(precision = precisionRound(step, Math.max(Math.abs(start), Math.abs(stop))))) specifier.precision = precision - (specifier.type === "e");
+               break;
+             }
 
-                   // prepare result
-                   var result = {
-                       title: entity.title,
-                       description: entity.description,
-                       editURL: 'https://wiki.openstreetmap.org/wiki/' + entity.title
-                   };
+           case "f":
+           case "%":
+             {
+               if (specifier.precision == null && !isNaN(precision = precisionFixed(step))) specifier.precision = precision - (specifier.type === "%") * 2;
+               break;
+             }
+         }
 
-                   // add image
-                   if (entity.claims) {
-                       var imageroot;
-                       var image = that.claimToValue(entity, 'P4', langCode);
-                       if (image) {
-                           imageroot = 'https://commons.wikimedia.org/w/index.php';
-                       } else {
-                           image = that.claimToValue(entity, 'P28', langCode);
-                           if (image) {
-                               imageroot = 'https://wiki.openstreetmap.org/w/index.php';
-                           }
-                       }
-                       if (imageroot && image) {
-                           result.imageURL = imageroot + '?' + utilQsString({
-                               title: 'Special:Redirect/file/' + image,
-                               width: 400
-                           });
-                       }
-                   }
+         return format(specifier);
+       }
 
-                   // Try to get a wiki page from tag data item first, followed by the corresponding key data item.
-                   // If neither tag nor key data item contain a wiki page in the needed language nor English,
-                   // get the first found wiki page from either the tag or the key item.
-                   var rtypeWiki = that.monolingualClaimToValueObj(data.rtype, 'P31');
-                   var tagWiki = that.monolingualClaimToValueObj(data.tag, 'P31');
-                   var keyWiki = that.monolingualClaimToValueObj(data.key, 'P31');
-
-                   // If exact language code does not exist, try to find the first part before the '-'
-                   // BUG: in some cases, a more elaborate fallback logic might be needed
-                   var langPrefix = langCode.split('-', 2)[0];
-
-                   // use the first acceptable wiki page
-                   result.wiki =
-                       getWikiInfo(rtypeWiki, langCode, 'inspector.wiki_reference') ||
-                       getWikiInfo(rtypeWiki, langPrefix, 'inspector.wiki_reference') ||
-                       getWikiInfo(rtypeWiki, 'en', 'inspector.wiki_en_reference') ||
-                       getWikiInfo(tagWiki, langCode, 'inspector.wiki_reference') ||
-                       getWikiInfo(tagWiki, langPrefix, 'inspector.wiki_reference') ||
-                       getWikiInfo(tagWiki, 'en', 'inspector.wiki_en_reference') ||
-                       getWikiInfo(keyWiki, langCode, 'inspector.wiki_reference') ||
-                       getWikiInfo(keyWiki, langPrefix, 'inspector.wiki_reference') ||
-                       getWikiInfo(keyWiki, 'en', 'inspector.wiki_en_reference');
-
-                   callback(null, result);
-
-
-                   // Helper method to get wiki info if a given language exists
-                   function getWikiInfo(wiki, langCode, tKey) {
-                       if (wiki && wiki[langCode]) {
-                           return {
-                               title: wiki[langCode],
-                               text: tKey,
-                               url: 'https://wiki.openstreetmap.org/wiki/' + wiki[langCode]
-                           };
-                       }
-                   }
-               });
-           },
+       function linearish(scale) {
+         var domain = scale.domain;
 
+         scale.ticks = function (count) {
+           var d = domain();
+           return ticks(d[0], d[d.length - 1], count == null ? 10 : count);
+         };
 
-           addLocale: function(langCode, qid) {
-               // Makes it easier to unit test
-               _localeIDs[langCode] = qid;
-           },
+         scale.tickFormat = function (count, specifier) {
+           var d = domain();
+           return tickFormat(d[0], d[d.length - 1], count == null ? 10 : count, specifier);
+         };
 
+         scale.nice = function (count) {
+           if (count == null) count = 10;
+           var d = domain();
+           var i0 = 0;
+           var i1 = d.length - 1;
+           var start = d[i0];
+           var stop = d[i1];
+           var prestep;
+           var step;
+           var maxIter = 10;
 
-           apibase: function(val) {
-               if (!arguments.length) return apibase$3;
-               apibase$3 = val;
-               return this;
+           if (stop < start) {
+             step = start, start = stop, stop = step;
+             step = i0, i0 = i1, i1 = step;
            }
 
-       };
-
-       var jsonpCache = {};
-       window.jsonpCache = jsonpCache;
+           while (maxIter-- > 0) {
+             step = tickIncrement(start, stop, count);
 
-       function jsonpRequest(url, callback) {
-           var request = {
-               abort: function() {}
-           };
+             if (step === prestep) {
+               d[i0] = start;
+               d[i1] = stop;
+               return domain(d);
+             } else if (step > 0) {
+               start = Math.floor(start / step) * step;
+               stop = Math.ceil(stop / step) * step;
+             } else if (step < 0) {
+               start = Math.ceil(start * step) / step;
+               stop = Math.floor(stop * step) / step;
+             } else {
+               break;
+             }
 
-           if (window.JSONP_FIX) {
-               if (window.JSONP_DELAY === 0) {
-                   callback(window.JSONP_FIX);
-               } else {
-                   var t = window.setTimeout(function() {
-                       callback(window.JSONP_FIX);
-                   }, window.JSONP_DELAY || 0);
+             prestep = step;
+           }
 
-                   request.abort = function() { window.clearTimeout(t); };
-               }
+           return scale;
+         };
 
-               return request;
-           }
+         return scale;
+       }
+       function linear$2() {
+         var scale = continuous();
 
-           function rand() {
-               var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
-               var c = '';
-               var i = -1;
-               while (++i < 15) c += chars.charAt(Math.floor(Math.random() * 52));
-               return c;
-           }
+         scale.copy = function () {
+           return copy(scale, linear$2());
+         };
 
-           function create(url) {
-               var e = url.match(/callback=(\w+)/);
-               var c = e ? e[1] : rand();
+         initRange.apply(scale, arguments);
+         return linearish(scale);
+       }
 
-               jsonpCache[c] = function(data) {
-                   if (jsonpCache[c]) {
-                       callback(data);
-                   }
-                   finalize();
-               };
+       var nativeExpm1 = Math.expm1;
+       var exp$1 = Math.exp;
 
-               function finalize() {
-                   delete jsonpCache[c];
-                   script.remove();
-               }
+       // `Math.expm1` method implementation
+       // https://tc39.github.io/ecma262/#sec-math.expm1
+       var mathExpm1 = (!nativeExpm1
+         // Old FF bug
+         || nativeExpm1(10) > 22025.465794806719 || nativeExpm1(10) < 22025.4657948067165168
+         // Tor Browser bug
+         || nativeExpm1(-2e-17) != -2e-17
+       ) ? function expm1(x) {
+         return (x = +x) == 0 ? x : x > -1e-6 && x < 1e-6 ? x + x * x / 2 : exp$1(x) - 1;
+       } : nativeExpm1;
 
-               request.abort = finalize;
-               return 'jsonpCache.' + c;
-           }
+       function quantize() {
+         var x0 = 0,
+             x1 = 1,
+             n = 1,
+             domain = [0.5],
+             range = [0, 1],
+             unknown;
 
-           var cb = create(url);
+         function scale(x) {
+           return x <= x ? range[bisectRight(domain, x, 0, n)] : unknown;
+         }
 
-           var script = select('head')
-               .append('script')
-               .attr('type', 'text/javascript')
-               .attr('src', url.replace(/(\{|%7B)callback(\}|%7D)/, cb));
+         function rescale() {
+           var i = -1;
+           domain = new Array(n);
 
-           return request;
-       }
+           while (++i < n) {
+             domain[i] = ((i + 1) * x1 - (i - n) * x0) / (n + 1);
+           }
 
-       const bubbleApi = 'https://dev.virtualearth.net/mapcontrol/HumanScaleServices/GetBubbles.ashx?';
-       const streetsideImagesApi = 'https://t.ssl.ak.tiles.virtualearth.net/tiles/';
-       const bubbleAppKey = 'AuftgJsO0Xs8Ts4M1xZUQJQXJNsvmh3IV8DkNieCiy3tCwCUMq76-WpkrBtNAuEm';
-       const pannellumViewerCSS = 'pannellum-streetside/pannellum.css';
-       const pannellumViewerJS = 'pannellum-streetside/pannellum.js';
-       const maxResults$2 = 2000;
-       const tileZoom$2 = 16.5;
-       const tiler$6 = utilTiler().zoomExtent([tileZoom$2, tileZoom$2]).skipNullIsland(true);
-       const dispatch$7 = dispatch('loadedBubbles', 'viewerChanged');
-       const minHfov = 10;         // zoom in degrees:  20, 10, 5
-       const maxHfov = 90;         // zoom out degrees
-       const defaultHfov = 45;
-
-       let _hires = false;
-       let _resolution = 512;    // higher numbers are slower - 512, 1024, 2048, 4096
-       let _currScene = 0;
-       let _ssCache;
-       let _pannellumViewer;
-       let _sceneOptions;
-       let _dataUrlArray = [];
+           return scale;
+         }
 
+         scale.domain = function (_) {
+           var _ref, _ref2;
 
-       /**
-        * abortRequest().
-        */
-       function abortRequest$6(i) {
-         i.abort();
-       }
+           return arguments.length ? ((_ref = _, _ref2 = _slicedToArray(_ref, 2), x0 = _ref2[0], x1 = _ref2[1], _ref), x0 = +x0, x1 = +x1, rescale()) : [x0, x1];
+         };
 
+         scale.range = function (_) {
+           return arguments.length ? (n = (range = Array.from(_)).length - 1, rescale()) : range.slice();
+         };
 
-       /**
-        * localeTimeStamp().
-        */
-       function localeTimestamp(s) {
-         if (!s) return null;
-         const options = { day: 'numeric', month: 'short', year: 'numeric' };
-         const d = new Date(s);
-         if (isNaN(d.getTime())) return null;
-         return d.toLocaleString(_mainLocalizer.localeCode(), options);
-       }
+         scale.invertExtent = function (y) {
+           var i = range.indexOf(y);
+           return i < 0 ? [NaN, NaN] : i < 1 ? [x0, domain[0]] : i >= n ? [domain[n - 1], x1] : [domain[i - 1], domain[i]];
+         };
 
+         scale.unknown = function (_) {
+           return arguments.length ? (unknown = _, scale) : scale;
+         };
 
-       /**
-        * loadTiles() wraps the process of generating tiles and then fetching image points for each tile.
-        */
-       function loadTiles$2(which, url, projection, margin) {
-         const tiles = tiler$6.margin(margin).getTiles(projection);
+         scale.thresholds = function () {
+           return domain.slice();
+         };
 
-         // abort inflight requests that are no longer needed
-         const cache = _ssCache[which];
-         Object.keys(cache.inflight).forEach(k => {
-           const wanted = tiles.find(tile => k.indexOf(tile.id + ',') === 0);
-           if (!wanted) {
-             abortRequest$6(cache.inflight[k]);
-             delete cache.inflight[k];
-           }
-         });
+         scale.copy = function () {
+           return quantize().domain([x0, x1]).range(range).unknown(unknown);
+         };
 
-         tiles.forEach(tile => loadNextTilePage$2(which, url, tile));
+         return initRange.apply(linearish(scale), arguments);
        }
 
+       // https://github.com/tc39/proposal-string-pad-start-end
+
+
+
+
+       var ceil$1 = Math.ceil;
+
+       // `String.prototype.{ padStart, padEnd }` methods implementation
+       var createMethod$6 = function (IS_END) {
+         return function ($this, maxLength, fillString) {
+           var S = String(requireObjectCoercible($this));
+           var stringLength = S.length;
+           var fillStr = fillString === undefined ? ' ' : String(fillString);
+           var intMaxLength = toLength(maxLength);
+           var fillLen, stringFiller;
+           if (intMaxLength <= stringLength || fillStr == '') return S;
+           fillLen = intMaxLength - stringLength;
+           stringFiller = stringRepeat.call(fillStr, ceil$1(fillLen / fillStr.length));
+           if (stringFiller.length > fillLen) stringFiller = stringFiller.slice(0, fillLen);
+           return IS_END ? S + stringFiller : stringFiller + S;
+         };
+       };
+
+       var stringPad = {
+         // `String.prototype.padStart` method
+         // https://tc39.github.io/ecma262/#sec-string.prototype.padstart
+         start: createMethod$6(false),
+         // `String.prototype.padEnd` method
+         // https://tc39.github.io/ecma262/#sec-string.prototype.padend
+         end: createMethod$6(true)
+       };
+
+       var padStart = stringPad.start;
+
+       var abs$3 = Math.abs;
+       var DatePrototype$1 = Date.prototype;
+       var getTime$1 = DatePrototype$1.getTime;
+       var nativeDateToISOString = DatePrototype$1.toISOString;
+
+       // `Date.prototype.toISOString` method implementation
+       // https://tc39.github.io/ecma262/#sec-date.prototype.toisostring
+       // PhantomJS / old WebKit fails here:
+       var dateToIsoString = (fails(function () {
+         return nativeDateToISOString.call(new Date(-5e13 - 1)) != '0385-07-25T07:06:39.999Z';
+       }) || !fails(function () {
+         nativeDateToISOString.call(new Date(NaN));
+       })) ? function toISOString() {
+         if (!isFinite(getTime$1.call(this))) throw RangeError('Invalid time value');
+         var date = this;
+         var year = date.getUTCFullYear();
+         var milliseconds = date.getUTCMilliseconds();
+         var sign = year < 0 ? '-' : year > 9999 ? '+' : '';
+         return sign + padStart(abs$3(year), sign ? 6 : 4, 0) +
+           '-' + padStart(date.getUTCMonth() + 1, 2, 0) +
+           '-' + padStart(date.getUTCDate(), 2, 0) +
+           'T' + padStart(date.getUTCHours(), 2, 0) +
+           ':' + padStart(date.getUTCMinutes(), 2, 0) +
+           ':' + padStart(date.getUTCSeconds(), 2, 0) +
+           '.' + padStart(milliseconds, 3, 0) +
+           'Z';
+       } : nativeDateToISOString;
+
+       // `Date.prototype.toISOString` method
+       // https://tc39.github.io/ecma262/#sec-date.prototype.toisostring
+       // PhantomJS / old WebKit has a broken implementations
+       _export({ target: 'Date', proto: true, forced: Date.prototype.toISOString !== dateToIsoString }, {
+         toISOString: dateToIsoString
+       });
 
-       /**
-        * loadNextTilePage() load data for the next tile page in line.
-        */
-       function loadNextTilePage$2(which, url, tile) {
-         const cache = _ssCache[which];
-         const nextPage = cache.nextPage[tile.id] || 0;
-         const id = tile.id + ',' + String(nextPage);
-         if (cache.loaded[id] || cache.inflight[id]) return;
+       function behaviorBreathe() {
+         var duration = 800;
+         var steps = 4;
+         var selector = '.selected.shadow, .selected .shadow';
 
-         cache.inflight[id] = getBubbles(url, tile, (bubbles) => {
-           cache.loaded[id] = true;
-           delete cache.inflight[id];
-           if (!bubbles) return;
+         var _selected = select(null);
 
-           // [].shift() removes the first element, some statistics info, not a bubble point
-           bubbles.shift();
+         var _classed = '';
+         var _params = {};
+         var _done = false;
 
-           const features = bubbles.map(bubble => {
-             if (cache.points[bubble.id]) return null;  // skip duplicates
+         var _timer;
 
-             const loc = [bubble.lo, bubble.la];
-             const d = {
-               loc: loc,
-               key: bubble.id,
-               ca: bubble.he,
-               captured_at: bubble.cd,
-               captured_by: 'microsoft',
-               // nbn: bubble.nbn,
-               // pbn: bubble.pbn,
-               // ad: bubble.ad,
-               // rn: bubble.rn,
-               pr: bubble.pr,  // previous
-               ne: bubble.ne,  // next
-               pano: true,
-               sequenceKey: null
-             };
+         function ratchetyInterpolator(a, b, steps, units) {
+           a = parseFloat(a);
+           b = parseFloat(b);
+           var sample = quantize().domain([0, 1]).range(d3_quantize(d3_interpolateNumber(a, b), steps));
+           return function (t) {
+             return String(sample(t)) + (units || '');
+           };
+         }
 
-             cache.points[bubble.id] = d;
+         function reset(selection) {
+           selection.style('stroke-opacity', null).style('stroke-width', null).style('fill-opacity', null).style('r', null);
+         }
 
-             // a sequence starts here
-             if (bubble.pr === undefined) {
-               cache.leaders.push(bubble.id);
-             }
+         function setAnimationParams(transition, fromTo) {
+           var toFrom = fromTo === 'from' ? 'to' : 'from';
+           transition.styleTween('stroke-opacity', function (d) {
+             return ratchetyInterpolator(_params[d.id][toFrom].opacity, _params[d.id][fromTo].opacity, steps);
+           }).styleTween('stroke-width', function (d) {
+             return ratchetyInterpolator(_params[d.id][toFrom].width, _params[d.id][fromTo].width, steps, 'px');
+           }).styleTween('fill-opacity', function (d) {
+             return ratchetyInterpolator(_params[d.id][toFrom].opacity, _params[d.id][fromTo].opacity, steps);
+           }).styleTween('r', function (d) {
+             return ratchetyInterpolator(_params[d.id][toFrom].width, _params[d.id][fromTo].width, steps, 'px');
+           });
+         }
 
-             return {
-               minX: loc[0], minY: loc[1], maxX: loc[0], maxY: loc[1], data: d
+         function calcAnimationParams(selection) {
+           selection.call(reset).each(function (d) {
+             var s = select(this);
+             var tag = s.node().tagName;
+             var p = {
+               'from': {},
+               'to': {}
              };
+             var opacity;
+             var width; // determine base opacity and width
 
-           }).filter(Boolean);
+             if (tag === 'circle') {
+               opacity = parseFloat(s.style('fill-opacity') || 0.5);
+               width = parseFloat(s.style('r') || 15.5);
+             } else {
+               opacity = parseFloat(s.style('stroke-opacity') || 0.7);
+               width = parseFloat(s.style('stroke-width') || 10);
+             } // calculate from/to interpolation params..
 
-           cache.rtree.load(features);
 
-           connectSequences();
+             p.tag = tag;
+             p.from.opacity = opacity * 0.6;
+             p.to.opacity = opacity * 1.25;
+             p.from.width = width * 0.7;
+             p.to.width = width * (tag === 'circle' ? 1.5 : 1);
+             _params[d.id] = p;
+           });
+         }
 
-           if (which === 'bubbles') {
-             dispatch$7.call('loadedBubbles');
-           }
-         });
-       }
+         function run(surface, fromTo) {
+           var toFrom = fromTo === 'from' ? 'to' : 'from';
+           var currSelected = surface.selectAll(selector);
+           var currClassed = surface.attr('class');
 
+           if (_done || currSelected.empty()) {
+             _selected.call(reset);
 
-       // call this sometimes to connect the bubbles into sequences
-       function connectSequences() {
-         let cache = _ssCache.bubbles;
-         let keepLeaders = [];
+             _selected = select(null);
+             return;
+           }
 
-         for (let i = 0; i < cache.leaders.length; i++) {
-           let bubble = cache.points[cache.leaders[i]];
-           let seen = {};
+           if (!fastDeepEqual(currSelected.data(), _selected.data()) || currClassed !== _classed) {
+             _selected.call(reset);
 
-           // try to make a sequence.. use the key of the leader bubble.
-           let sequence = { key: bubble.key, bubbles: [] };
-           let complete = false;
+             _classed = currClassed;
+             _selected = currSelected.call(calcAnimationParams);
+           }
 
-           do {
-             sequence.bubbles.push(bubble);
-             seen[bubble.key] = true;
+           var didCallNextRun = false;
 
-             if (bubble.ne === undefined) {
-               complete = true;
-             } else {
-               bubble = cache.points[bubble.ne];  // advance to next
-             }
-           } while (bubble && !seen[bubble.key] && !complete);
+           _selected.transition().duration(duration).call(setAnimationParams, fromTo).on('end', function () {
+             // `end` event is called for each selected element, but we want
+             // it to run only once
+             if (!didCallNextRun) {
+               surface.call(run, toFrom);
+               didCallNextRun = true;
+             } // if entity was deselected, remove breathe styling
 
 
-           if (complete) {
-             _ssCache.sequences[sequence.key] = sequence;
+             if (!select(this).classed('selected')) {
+               reset(select(this));
+             }
+           });
+         }
 
-             // assign bubbles to the sequence
-             for (let j = 0; j < sequence.bubbles.length; j++) {
-               sequence.bubbles[j].sequenceKey = sequence.key;
+         function behavior(surface) {
+           _done = false;
+           _timer = timer(function () {
+             // wait for elements to actually become selected
+             if (surface.selectAll(selector).empty()) {
+               return false;
              }
 
-             // create a GeoJSON LineString
-             sequence.geojson = {
-               type: 'LineString',
-               properties: { key: sequence.key },
-               coordinates: sequence.bubbles.map(d => d.loc)
-             };
+             surface.call(run, 'from');
 
-           } else {
-             keepLeaders.push(cache.leaders[i]);
-           }
+             _timer.stop();
+
+             return true;
+           }, 20);
          }
 
-         // couldn't complete these, save for later
-         cache.leaders = keepLeaders;
-       }
+         behavior.restartIfNeeded = function (surface) {
+           if (_selected.empty()) {
+             surface.call(run, 'from');
 
+             if (_timer) {
+               _timer.stop();
+             }
+           }
+         };
 
-       /**
-        * getBubbles() handles the request to the server for a tile extent of 'bubbles' (streetside image locations).
-        */
-       function getBubbles(url, tile, callback) {
-         let rect = tile.extent.rectangle();
-         let urlForRequest = url + utilQsString({
-           n: rect[3],
-           s: rect[1],
-           e: rect[2],
-           w: rect[0],
-           c: maxResults$2,
-           appkey: bubbleAppKey,
-           jsCallback: '{callback}'
-         });
+         behavior.off = function () {
+           _done = true;
 
-         return jsonpRequest(urlForRequest, (data) => {
-           if (!data || data.error) {
-             callback(null);
-           } else {
-             callback(data);
+           if (_timer) {
+             _timer.stop();
            }
-         });
-       }
 
+           _selected.interrupt().call(reset);
+         };
 
-       // partition viewport into higher zoom tiles
-       function partitionViewport$2(projection) {
-         let z = geoScaleToZoom(projection.scale());
-         let z2 = (Math.ceil(z * 2) / 2) + 2.5;   // round to next 0.5 and add 2.5
-         let tiler = utilTiler().zoomExtent([z2, z2]);
-
-         return tiler.getTiles(projection)
-           .map(tile => tile.extent);
+         return behavior;
        }
 
+       /* Creates a keybinding behavior for an operation */
+       function behaviorOperation(context) {
+         var _operation;
 
-       // no more than `limit` results per partition.
-       function searchLimited$2(limit, projection, rtree) {
-         limit = limit || 5;
+         function keypress(d3_event) {
+           // prevent operations during low zoom selection
+           if (!context.map().withinEditableZoom()) return;
+           if (_operation.availableForKeypress && !_operation.availableForKeypress()) return;
+           d3_event.preventDefault();
 
-         return partitionViewport$2(projection)
-           .reduce((result, extent) => {
-             let found = rtree.search(extent.bbox())
-               .slice(0, limit)
-               .map(d => d.data);
+           var disabled = _operation.disabled();
 
-             return (found.length ? result.concat(found) : result);
-           }, []);
-       }
+           if (disabled) {
+             context.ui().flash.duration(4000).iconName('#iD-operation-' + _operation.id).iconClass('operation disabled').label(_operation.tooltip)();
+           } else {
+             context.ui().flash.duration(2000).iconName('#iD-operation-' + _operation.id).iconClass('operation').label(_operation.annotation() || _operation.title)();
+             if (_operation.point) _operation.point(null);
 
+             _operation();
+           }
+         }
 
-       /**
-        * loadImage()
-        */
-       function loadImage(imgInfo) {
-         return new Promise(resolve => {
-           let img = new Image();
-           img.onload = () => {
-             let canvas = document.getElementById('ideditor-canvas' + imgInfo.face);
-             let ctx = canvas.getContext('2d');
-             ctx.drawImage(img, imgInfo.x, imgInfo.y);
-             resolve({ imgInfo: imgInfo, status: 'ok' });
-           };
-           img.onerror = () => {
-             resolve({ data: imgInfo, status: 'error' });
-           };
-           img.setAttribute('crossorigin', '');
-           img.src = imgInfo.url;
-         });
-       }
+         function behavior() {
+           if (_operation && _operation.available()) {
+             context.keybinding().on(_operation.keys, keypress);
+           }
 
+           return behavior;
+         }
 
-       /**
-        * loadCanvas()
-        */
-       function loadCanvas(imageGroup) {
-         return Promise.all(imageGroup.map(loadImage))
-           .then((data) => {
-             let canvas = document.getElementById('ideditor-canvas' + data[0].imgInfo.face);
-             const which = { '01': 0, '02': 1, '03': 2, '10': 3, '11': 4, '12': 5 };
-             let face = data[0].imgInfo.face;
-             _dataUrlArray[which[face]] = canvas.toDataURL('image/jpeg', 1.0);
-             return { status: 'loadCanvas for face ' + data[0].imgInfo.face + 'ok'};
-           });
-       }
+         behavior.off = function () {
+           context.keybinding().off(_operation.keys);
+         };
 
+         behavior.which = function (_) {
+           if (!arguments.length) return _operation;
+           _operation = _;
+           return behavior;
+         };
 
-       /**
-        * loadFaces()
-        */
-       function loadFaces(faceGroup) {
-         return Promise.all(faceGroup.map(loadCanvas))
-           .then(() => { return { status: 'loadFaces done' }; });
+         return behavior;
        }
 
+       function operationCircularize(context, selectedIDs) {
+         var _extent;
 
-       function setupCanvas(selection, reset) {
-         if (reset) {
-           selection.selectAll('#ideditor-stitcher-canvases')
-             .remove();
-         }
-
-         // Add the Streetside working canvases. These are used for 'stitching', or combining,
-         // multiple images for each of the six faces, before passing to the Pannellum control as DataUrls
-         selection.selectAll('#ideditor-stitcher-canvases')
-           .data([0])
-           .enter()
-           .append('div')
-           .attr('id', 'ideditor-stitcher-canvases')
-           .attr('display', 'none')
-           .selectAll('canvas')
-           .data(['canvas01', 'canvas02', 'canvas03', 'canvas10', 'canvas11', 'canvas12'])
-           .enter()
-           .append('canvas')
-           .attr('id', d => 'ideditor-' + d)
-           .attr('width', _resolution)
-           .attr('height', _resolution);
-       }
+         var _actions = selectedIDs.map(getAction).filter(Boolean);
 
+         var _amount = _actions.length === 1 ? 'single' : 'multiple';
 
-       function qkToXY(qk) {
-         let x = 0;
-         let y = 0;
-         let scale = 256;
-         for (let i = qk.length; i > 0; i--) {
-           const key = qk[i-1];
-           x += (+(key === '1' || key === '3')) * scale;
-           y += (+(key === '2' || key === '3')) * scale;
-           scale *= 2;
-         }
-         return [x, y];
-       }
+         var _coords = utilGetAllNodes(selectedIDs, context.graph()).map(function (n) {
+           return n.loc;
+         });
 
+         function getAction(entityID) {
+           var entity = context.entity(entityID);
+           if (entity.type !== 'way' || new Set(entity.nodes).size <= 1) return null;
 
-       function getQuadKeys() {
-         let dim = _resolution / 256;
-         let quadKeys;
+           if (!_extent) {
+             _extent = entity.extent(context.graph());
+           } else {
+             _extent = _extent.extend(entity.extent(context.graph()));
+           }
 
-         if (dim === 16) {
-           quadKeys = [
-             '0000','0001','0010','0011','0100','0101','0110','0111',  '1000','1001','1010','1011','1100','1101','1110','1111',
-             '0002','0003','0012','0013','0102','0103','0112','0113',  '1002','1003','1012','1013','1102','1103','1112','1113',
-             '0020','0021','0030','0031','0120','0121','0130','0131',  '1020','1021','1030','1031','1120','1121','1130','1131',
-             '0022','0023','0032','0033','0122','0123','0132','0133',  '1022','1023','1032','1033','1122','1123','1132','1133',
-             '0200','0201','0210','0211','0300','0301','0310','0311',  '1200','1201','1210','1211','1300','1301','1310','1311',
-             '0202','0203','0212','0213','0302','0303','0312','0313',  '1202','1203','1212','1213','1302','1303','1312','1313',
-             '0220','0221','0230','0231','0320','0321','0330','0331',  '1220','1221','1230','1231','1320','1321','1330','1331',
-             '0222','0223','0232','0233','0322','0323','0332','0333',  '1222','1223','1232','1233','1322','1323','1332','1333',
-
-             '2000','2001','2010','2011','2100','2101','2110','2111',  '3000','3001','3010','3011','3100','3101','3110','3111',
-             '2002','2003','2012','2013','2102','2103','2112','2113',  '3002','3003','3012','3013','3102','3103','3112','3113',
-             '2020','2021','2030','2031','2120','2121','2130','2131',  '3020','3021','3030','3031','3120','3121','3130','3131',
-             '2022','2023','2032','2033','2122','2123','2132','2133',  '3022','3023','3032','3033','3122','3123','3132','3133',
-             '2200','2201','2210','2211','2300','2301','2310','2311',  '3200','3201','3210','3211','3300','3301','3310','3311',
-             '2202','2203','2212','2213','2302','2303','2312','2313',  '3202','3203','3212','3213','3302','3303','3312','3313',
-             '2220','2221','2230','2231','2320','2321','2330','2331',  '3220','3221','3230','3231','3320','3321','3330','3331',
-             '2222','2223','2232','2233','2322','2323','2332','2333',  '3222','3223','3232','3233','3322','3323','3332','3333'
-           ];
+           return actionCircularize(entityID, context.projection);
+         }
 
-         } else if (dim === 8) {
-           quadKeys = [
-             '000','001','010','011',  '100','101','110','111',
-             '002','003','012','013',  '102','103','112','113',
-             '020','021','030','031',  '120','121','130','131',
-             '022','023','032','033',  '122','123','132','133',
-
-             '200','201','210','211',  '300','301','310','311',
-             '202','203','212','213',  '302','303','312','313',
-             '220','221','230','231',  '320','321','330','331',
-             '222','223','232','233',  '322','323','332','333'
-           ];
+         var operation = function operation() {
+           if (!_actions.length) return;
 
-         } else if (dim === 4) {
-           quadKeys = [
-             '00','01',  '10','11',
-             '02','03',  '12','13',
+           var combinedAction = function combinedAction(graph, t) {
+             _actions.forEach(function (action) {
+               if (!action.disabled(graph)) {
+                 graph = action(graph, t);
+               }
+             });
 
-             '20','21',  '30','31',
-             '22','23',  '32','33'
-           ];
+             return graph;
+           };
 
-         } else {  // dim === 2
-           quadKeys = [
-             '0', '1',
-             '2', '3'
-           ];
-         }
+           combinedAction.transitionable = true;
+           context.perform(combinedAction, operation.annotation());
+           window.setTimeout(function () {
+             context.validator().validate();
+           }, 300); // after any transition
+         };
 
-         return quadKeys;
-       }
+         operation.available = function () {
+           return _actions.length && selectedIDs.length === _actions.length;
+         }; // don't cache this because the visible extent could change
 
 
+         operation.disabled = function () {
+           if (!_actions.length) return '';
 
-       var serviceStreetside = {
-         /**
-          * init() initialize streetside.
-          */
-         init: function() {
-           if (!_ssCache) {
-             this.reset();
-           }
+           var actionDisableds = _actions.map(function (action) {
+             return action.disabled(context.graph());
+           }).filter(Boolean);
 
-           this.event = utilRebind(this, dispatch$7, 'on');
-         },
+           if (actionDisableds.length === _actions.length) {
+             // none of the features can be circularized
+             if (new Set(actionDisableds).size > 1) {
+               return 'multiple_blockers';
+             }
 
-         /**
-          * reset() reset the cache.
-          */
-         reset: function() {
-           if (_ssCache) {
-             Object.values(_ssCache.bubbles.inflight).forEach(abortRequest$6);
+             return actionDisableds[0];
+           } else if (_extent.percentContainedIn(context.map().extent()) < 0.8) {
+             return 'too_large';
+           } else if (someMissing()) {
+             return 'not_downloaded';
+           } else if (selectedIDs.some(context.hasHiddenConnections)) {
+             return 'connected_to_hidden';
            }
 
-           _ssCache = {
-             bubbles: { inflight: {}, loaded: {}, nextPage: {}, rtree: new RBush(), points: {}, leaders: [] },
-             sequences: {}
-           };
-         },
-
-         /**
-          * bubbles()
-          */
-         bubbles: function(projection) {
-           const limit = 5;
-           return searchLimited$2(limit, projection, _ssCache.bubbles.rtree);
-         },
+           return false;
 
+           function someMissing() {
+             if (context.inIntro()) return false;
+             var osm = context.connection();
 
-         sequences: function(projection) {
-           const viewport = projection.clipExtent();
-           const min = [viewport[0][0], viewport[1][1]];
-           const max = [viewport[1][0], viewport[0][1]];
-           const bbox = geoExtent(projection.invert(min), projection.invert(max)).bbox();
-           let seen = {};
-           let results = [];
+             if (osm) {
+               var missing = _coords.filter(function (loc) {
+                 return !osm.isDataLoaded(loc);
+               });
 
-           // all sequences for bubbles in viewport
-           _ssCache.bubbles.rtree.search(bbox)
-             .forEach(d => {
-               const key = d.data.sequenceKey;
-               if (key && !seen[key]) {
-                   seen[key] = true;
-                   results.push(_ssCache.sequences[key].geojson);
+               if (missing.length) {
+                 missing.forEach(function (loc) {
+                   context.loadTileAtLoc(loc);
+                 });
+                 return true;
                }
-             });
-
-           return results;
-         },
+             }
 
+             return false;
+           }
+         };
 
-         /**
-          * loadBubbles()
-          */
-         loadBubbles: function(projection, margin) {
-           // by default: request 2 nearby tiles so we can connect sequences.
-           if (margin === undefined) margin = 2;
+         operation.tooltip = function () {
+           var disable = operation.disabled();
+           return disable ? _t('operations.circularize.' + disable + '.' + _amount) : _t('operations.circularize.description.' + _amount);
+         };
 
-           loadTiles$2('bubbles', bubbleApi, projection, margin);
-         },
+         operation.annotation = function () {
+           return _t('operations.circularize.annotation.feature', {
+             n: _actions.length
+           });
+         };
 
+         operation.id = 'circularize';
+         operation.keys = [_t('operations.circularize.key')];
+         operation.title = _t('operations.circularize.title');
+         operation.behavior = behaviorOperation(context).which(operation);
+         return operation;
+       }
 
-         viewer: function() {
-           return _pannellumViewer;
-         },
+       // For example, ⌘Z -> Ctrl+Z
 
+       var uiCmd = function uiCmd(code) {
+         var detected = utilDetect();
 
-         initViewer: function () {
-           if (!window.pannellum) return;
-           if (_pannellumViewer) return;
+         if (detected.os === 'mac') {
+           return code;
+         }
 
-           const sceneID = ++_currScene + '';
-           const options = {
-             'default': { firstScene: sceneID },
-             scenes: {}
-           };
-           options.scenes[sceneID] = _sceneOptions;
+         if (detected.os === 'win') {
+           if (code === '⌘⇧Z') return 'Ctrl+Y';
+         }
 
-           _pannellumViewer = window.pannellum.viewer('ideditor-viewer-streetside', options);
-         },
+         var result = '',
+             replacements = {
+           '⌘': 'Ctrl',
+           '⇧': 'Shift',
+           '⌥': 'Alt',
+           '⌫': 'Backspace',
+           '⌦': 'Delete'
+         };
 
+         for (var i = 0; i < code.length; i++) {
+           if (code[i] in replacements) {
+             result += replacements[code[i]] + (i < code.length - 1 ? '+' : '');
+           } else {
+             result += code[i];
+           }
+         }
 
-         /**
-          * loadViewer() create the streeside viewer.
-          */
-         loadViewer: function(context) {
-           let that = this;
+         return result;
+       }; // return a display-focused string for a given keyboard code
+
+       uiCmd.display = function (code) {
+         if (code.length !== 1) return code;
+         var detected = utilDetect();
+         var mac = detected.os === 'mac';
+         var replacements = {
+           '⌘': mac ? '⌘ ' + _t('shortcuts.key.cmd') : _t('shortcuts.key.ctrl'),
+           '⇧': mac ? '⇧ ' + _t('shortcuts.key.shift') : _t('shortcuts.key.shift'),
+           '⌥': mac ? '⌥ ' + _t('shortcuts.key.option') : _t('shortcuts.key.alt'),
+           '⌃': mac ? '⌃ ' + _t('shortcuts.key.ctrl') : _t('shortcuts.key.ctrl'),
+           '⌫': mac ? '⌫ ' + _t('shortcuts.key.delete') : _t('shortcuts.key.backspace'),
+           '⌦': mac ? '⌦ ' + _t('shortcuts.key.del') : _t('shortcuts.key.del'),
+           '↖': mac ? '↖ ' + _t('shortcuts.key.pgup') : _t('shortcuts.key.pgup'),
+           '↘': mac ? '↘ ' + _t('shortcuts.key.pgdn') : _t('shortcuts.key.pgdn'),
+           '⇞': mac ? '⇞ ' + _t('shortcuts.key.home') : _t('shortcuts.key.home'),
+           '⇟': mac ? '⇟ ' + _t('shortcuts.key.end') : _t('shortcuts.key.end'),
+           '↵': mac ? '⏎ ' + _t('shortcuts.key.return') : _t('shortcuts.key.enter'),
+           '⎋': mac ? '⎋ ' + _t('shortcuts.key.esc') : _t('shortcuts.key.esc'),
+           '☰': mac ? '☰ ' + _t('shortcuts.key.menu') : _t('shortcuts.key.menu')
+         };
+         return replacements[code] || code;
+       };
 
-           let pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
+       function operationDelete(context, selectedIDs) {
+         var multi = selectedIDs.length === 1 ? 'single' : 'multiple';
+         var action = actionDeleteMultiple(selectedIDs);
+         var nodes = utilGetAllNodes(selectedIDs, context.graph());
+         var coords = nodes.map(function (n) {
+           return n.loc;
+         });
+         var extent = utilTotalExtent(selectedIDs, context.graph());
 
-           // create ms-wrapper, a photo wrapper class
-           let wrap = context.container().select('.photoviewer').selectAll('.ms-wrapper')
-             .data([0]);
+         var operation = function operation() {
+           var nextSelectedID;
+           var nextSelectedLoc;
 
-           // inject ms-wrapper into the photoviewer div
-           // (used by all to house each custom photo viewer)
-           let wrapEnter = wrap.enter()
-             .append('div')
-             .attr('class', 'photo-wrapper ms-wrapper')
-             .classed('hide', true);
-
-           // inject div to support streetside viewer (pannellum) and attribution line
-           wrapEnter
-             .append('div')
-             .attr('id', 'ideditor-viewer-streetside')
-             .on(pointerPrefix + 'down.streetside', () => {
-               select(window)
-                 .on(pointerPrefix + 'move.streetside', () => {
-                   dispatch$7.call('viewerChanged');
-                 }, true);
-             })
-             .on(pointerPrefix + 'up.streetside pointercancel.streetside', () => {
-               select(window)
-                 .on(pointerPrefix + 'move.streetside', null);
-
-               // continue dispatching events for a few seconds, in case viewer has inertia.
-               let t = timer(elapsed => {
-                 dispatch$7.call('viewerChanged');
-                 if (elapsed > 2000) {
-                   t.stop();
-                 }
-               });
-             })
-             .append('div')
-             .attr('class', 'photo-attribution fillD');
-
-           let controlsEnter = wrapEnter
-             .append('div')
-             .attr('class', 'photo-controls-wrap')
-             .append('div')
-             .attr('class', 'photo-controls');
-
-           controlsEnter
-             .append('button')
-             .on('click.back', step(-1))
-             .text('◄');
-
-           controlsEnter
-             .append('button')
-             .on('click.forward', step(1))
-             .text('►');
-
-
-           // create working canvas for stitching together images
-           wrap = wrap
-             .merge(wrapEnter)
-             .call(setupCanvas, true);
-
-           // load streetside pannellum viewer css
-           select('head').selectAll('#ideditor-streetside-viewercss')
-             .data([0])
-             .enter()
-             .append('link')
-             .attr('id', 'ideditor-streetside-viewercss')
-             .attr('rel', 'stylesheet')
-             .attr('href', context.asset(pannellumViewerCSS));
-
-           // load streetside pannellum viewer js
-           select('head').selectAll('#ideditor-streetside-viewerjs')
-             .data([0])
-             .enter()
-             .append('script')
-             .attr('id', 'ideditor-streetside-viewerjs')
-             .attr('src', context.asset(pannellumViewerJS));
-
-
-           // Register viewer resize handler
-           context.ui().photoviewer.on('resize.streetside', () => {
-             if (_pannellumViewer) {
-               _pannellumViewer.resize();
-             }
-           });
+           if (selectedIDs.length === 1) {
+             var id = selectedIDs[0];
+             var entity = context.entity(id);
+             var geometry = entity.geometry(context.graph());
+             var parents = context.graph().parentWays(entity);
+             var parent = parents[0]; // Select the next closest node in the way.
 
+             if (geometry === 'vertex') {
+               var nodes = parent.nodes;
+               var i = nodes.indexOf(id);
 
-           function step(stepBy) {
-             return () => {
-               let viewer = context.container().select('.photoviewer');
-               let selected = viewer.empty() ? undefined : viewer.datum();
-               if (!selected) return;
+               if (i === 0) {
+                 i++;
+               } else if (i === nodes.length - 1) {
+                 i--;
+               } else {
+                 var a = geoSphericalDistance(entity.loc, context.entity(nodes[i - 1]).loc);
+                 var b = geoSphericalDistance(entity.loc, context.entity(nodes[i + 1]).loc);
+                 i = a < b ? i - 1 : i + 1;
+               }
 
-               let nextID = (stepBy === 1 ? selected.ne : selected.pr);
-               let yaw = _pannellumViewer.getYaw();
-               let ca = selected.ca + yaw;
-               let origin = selected.loc;
+               nextSelectedID = nodes[i];
+               nextSelectedLoc = context.entity(nextSelectedID).loc;
+             }
+           }
 
-               // construct a search trapezoid pointing out from current bubble
-               const meters = 35;
-               let p1 = [
-                 origin[0] + geoMetersToLon(meters / 5, origin[1]),
-                 origin[1]
-               ];
-               let p2 = [
-                 origin[0] + geoMetersToLon(meters / 2, origin[1]),
-                 origin[1] + geoMetersToLat(meters)
-               ];
-               let p3 = [
-                 origin[0] - geoMetersToLon(meters / 2, origin[1]),
-                 origin[1] + geoMetersToLat(meters)
-               ];
-               let p4 = [
-                 origin[0] - geoMetersToLon(meters / 5, origin[1]),
-                 origin[1]
-               ];
+           context.perform(action, operation.annotation());
+           context.validator().validate();
 
-               let poly = [p1, p2, p3, p4, p1];
+           if (nextSelectedID && nextSelectedLoc) {
+             if (context.hasEntity(nextSelectedID)) {
+               context.enter(modeSelect(context, [nextSelectedID]).follow(true));
+             } else {
+               context.map().centerEase(nextSelectedLoc);
+               context.enter(modeBrowse(context));
+             }
+           } else {
+             context.enter(modeBrowse(context));
+           }
+         };
 
-               // rotate it to face forward/backward
-               let angle = (stepBy === 1 ? ca : ca + 180) * (Math.PI / 180);
-               poly = geoRotate(poly, -angle, origin);
+         operation.available = function () {
+           return true;
+         };
 
-               let extent = poly.reduce((extent, point) => {
-                 return extent.extend(geoExtent(point));
-               }, geoExtent());
-
-               // find nearest other bubble in the search polygon
-               let minDist = Infinity;
-               _ssCache.bubbles.rtree.search(extent.bbox())
-                 .forEach(d => {
-                   if (d.data.key === selected.key) return;
-                   if (!geoPointInPolygon(d.data.loc, poly)) return;
-
-                   let dist = geoVecLength(d.data.loc, selected.loc);
-                   let theta = selected.ca - d.data.ca;
-                   let minTheta = Math.min(Math.abs(theta), 360 - Math.abs(theta));
-                   if (minTheta > 20) {
-                     dist += 5;  // penalize distance if camera angles don't match
-                   }
+         operation.disabled = function () {
+           if (extent.percentContainedIn(context.map().extent()) < 0.8) {
+             return 'too_large';
+           } else if (someMissing()) {
+             return 'not_downloaded';
+           } else if (selectedIDs.some(context.hasHiddenConnections)) {
+             return 'connected_to_hidden';
+           } else if (selectedIDs.some(protectedMember)) {
+             return 'part_of_relation';
+           } else if (selectedIDs.some(incompleteRelation)) {
+             return 'incomplete_relation';
+           } else if (selectedIDs.some(hasWikidataTag)) {
+             return 'has_wikidata_tag';
+           }
 
-                   if (dist < minDist) {
-                     nextID = d.data.key;
-                     minDist = dist;
-                   }
-                 });
+           return false;
 
-               let nextBubble = nextID && _ssCache.bubbles.points[nextID];
-               if (!nextBubble) return;
+           function someMissing() {
+             if (context.inIntro()) return false;
+             var osm = context.connection();
 
-               context.map().centerEase(nextBubble.loc);
+             if (osm) {
+               var missing = coords.filter(function (loc) {
+                 return !osm.isDataLoaded(loc);
+               });
 
-               that.selectImage(context, nextBubble)
-                 .then(response => {
-                   if (response.status === 'ok') {
-                     _sceneOptions.yaw = yaw;
-                     that.showViewer(context);
-                   }
+               if (missing.length) {
+                 missing.forEach(function (loc) {
+                   context.loadTileAtLoc(loc);
                  });
-             };
-           }
-         },
+                 return true;
+               }
+             }
 
+             return false;
+           }
 
-         /**
-          * showViewer()
-          */
-         showViewer: function(context, yaw) {
-           if (!_sceneOptions) return;
+           function hasWikidataTag(id) {
+             var entity = context.entity(id);
+             return entity.tags.wikidata && entity.tags.wikidata.trim().length > 0;
+           }
 
-           if (yaw !== undefined) {
-             _sceneOptions.yaw = yaw;
+           function incompleteRelation(id) {
+             var entity = context.entity(id);
+             return entity.type === 'relation' && !entity.isComplete(context.graph());
            }
 
-           if (!_pannellumViewer) {
-             this.initViewer();
-           } else {
-             // make a new scene
-             let sceneID = ++_currScene + '';
-             _pannellumViewer
-               .addScene(sceneID, _sceneOptions)
-               .loadScene(sceneID);
+           function protectedMember(id) {
+             var entity = context.entity(id);
+             if (entity.type !== 'way') return false;
+             var parents = context.graph().parentRelations(entity);
+
+             for (var i = 0; i < parents.length; i++) {
+               var parent = parents[i];
+               var type = parent.tags.type;
+               var role = parent.memberById(id).role || 'outer';
 
-             // remove previous scene
-             if (_currScene > 2) {
-               sceneID = (_currScene - 1) + '';
-               _pannellumViewer
-                 .removeScene(sceneID);
+               if (type === 'route' || type === 'boundary' || type === 'multipolygon' && role === 'outer') {
+                 return true;
+               }
              }
+
+             return false;
            }
+         };
 
-           let wrap = context.container().select('.photoviewer')
-             .classed('hide', false);
+         operation.tooltip = function () {
+           var disable = operation.disabled();
+           return disable ? _t('operations.delete.' + disable + '.' + multi) : _t('operations.delete.description.' + multi);
+         };
 
-           let isHidden = wrap.selectAll('.photo-wrapper.ms-wrapper.hide').size();
+         operation.annotation = function () {
+           return selectedIDs.length === 1 ? _t('operations.delete.annotation.' + context.graph().geometry(selectedIDs[0])) : _t('operations.delete.annotation.feature', {
+             n: selectedIDs.length
+           });
+         };
 
-           if (isHidden) {
-             wrap
-               .selectAll('.photo-wrapper:not(.ms-wrapper)')
-               .classed('hide', true);
+         operation.id = 'delete';
+         operation.keys = [uiCmd('⌘⌫'), uiCmd('⌘⌦'), uiCmd('⌦')];
+         operation.title = _t('operations.delete.title');
+         operation.behavior = behaviorOperation(context).which(operation);
+         return operation;
+       }
 
-             wrap
-               .selectAll('.photo-wrapper.ms-wrapper')
-               .classed('hide', false);
-           }
+       function operationOrthogonalize(context, selectedIDs) {
+         var _extent;
 
-           return this;
-         },
+         var _type;
 
+         var _actions = selectedIDs.map(chooseAction).filter(Boolean);
 
-         /**
-          * hideViewer()
-          */
-         hideViewer: function (context) {
-           let viewer = context.container().select('.photoviewer');
-           if (!viewer.empty()) viewer.datum(null);
+         var _amount = _actions.length === 1 ? 'single' : 'multiple';
 
-           viewer
-             .classed('hide', true)
-             .selectAll('.photo-wrapper')
-             .classed('hide', true);
+         var _coords = utilGetAllNodes(selectedIDs, context.graph()).map(function (n) {
+           return n.loc;
+         });
 
-           context.container().selectAll('.viewfield-group, .sequence, .icon-sign')
-             .classed('currentView', false);
+         function chooseAction(entityID) {
+           var entity = context.entity(entityID);
+           var geometry = entity.geometry(context.graph());
 
-           return this.setStyles(context, null, true);
-         },
+           if (!_extent) {
+             _extent = entity.extent(context.graph());
+           } else {
+             _extent = _extent.extend(entity.extent(context.graph()));
+           } // square a line/area
 
 
-         /**
-          * selectImage().
-          */
-         selectImage: function (context, d) {
-           let that = this;
-           let viewer = context.container().select('.photoviewer');
-           if (!viewer.empty()) viewer.datum(d);
+           if (entity.type === 'way' && new Set(entity.nodes).size > 2) {
+             if (_type && _type !== 'feature') return null;
+             _type = 'feature';
+             return actionOrthogonalize(entityID, context.projection); // square a single vertex
+           } else if (geometry === 'vertex') {
+             if (_type && _type !== 'corner') return null;
+             _type = 'corner';
+             var graph = context.graph();
+             var parents = graph.parentWays(entity);
 
-           this.setStyles(context, null, true);
+             if (parents.length === 1) {
+               var way = parents[0];
 
-           let wrap = context.container().select('.photoviewer .ms-wrapper');
-           let attribution = wrap.selectAll('.photo-attribution').html('');
+               if (way.nodes.indexOf(entityID) !== -1) {
+                 return actionOrthogonalize(way.id, context.projection, entityID);
+               }
+             }
+           }
 
-           wrap.selectAll('.pnlm-load-box')   // display "loading.."
-             .style('display', 'block');
+           return null;
+         }
 
-           if (!d) {
-             return Promise.resolve({ status: 'ok' });
-           }
+         var operation = function operation() {
+           if (!_actions.length) return;
 
-           let line1 = attribution
-             .append('div')
-             .attr('class', 'attribution-row');
+           var combinedAction = function combinedAction(graph, t) {
+             _actions.forEach(function (action) {
+               if (!action.disabled(graph)) {
+                 graph = action(graph, t);
+               }
+             });
 
-           const hiresDomId = utilUniqueDomId('streetside-hires');
+             return graph;
+           };
 
-           // Add hires checkbox
-           let label = line1
-             .append('label')
-             .attr('for', hiresDomId)
-             .attr('class', 'streetside-hires');
+           combinedAction.transitionable = true;
+           context.perform(combinedAction, operation.annotation());
+           window.setTimeout(function () {
+             context.validator().validate();
+           }, 300); // after any transition
+         };
 
-           label
-             .append('input')
-             .attr('type', 'checkbox')
-             .attr('id', hiresDomId)
-             .property('checked', _hires)
-             .on('click', () => {
-               event.stopPropagation();
+         operation.available = function () {
+           return _actions.length && selectedIDs.length === _actions.length;
+         }; // don't cache this because the visible extent could change
 
-               _hires = !_hires;
-               _resolution = _hires ? 1024 : 512;
-               wrap.call(setupCanvas, true);
 
-               let viewstate = {
-                 yaw: _pannellumViewer.getYaw(),
-                 pitch: _pannellumViewer.getPitch(),
-                 hfov: _pannellumViewer.getHfov()
-               };
+         operation.disabled = function () {
+           if (!_actions.length) return '';
 
-               that.selectImage(context, d)
-                 .then(response => {
-                   if (response.status === 'ok') {
-                     _sceneOptions = Object.assign(_sceneOptions, viewstate);
-                     that.showViewer(context);
-                   }
-                 });
-             });
+           var actionDisableds = _actions.map(function (action) {
+             return action.disabled(context.graph());
+           }).filter(Boolean);
 
-           label
-             .append('span')
-             .text(_t('streetside.hires'));
+           if (actionDisableds.length === _actions.length) {
+             // none of the features can be squared
+             if (new Set(actionDisableds).size > 1) {
+               return 'multiple_blockers';
+             }
 
+             return actionDisableds[0];
+           } else if (_extent && _extent.percentContainedIn(context.map().extent()) < 0.8) {
+             return 'too_large';
+           } else if (someMissing()) {
+             return 'not_downloaded';
+           } else if (selectedIDs.some(context.hasHiddenConnections)) {
+             return 'connected_to_hidden';
+           }
 
-           let captureInfo = line1
-             .append('div')
-             .attr('class', 'attribution-capture-info');
+           return false;
 
-           // Add capture date
-           if (d.captured_by) {
-             const yyyy = (new Date()).getFullYear();
+           function someMissing() {
+             if (context.inIntro()) return false;
+             var osm = context.connection();
 
-             captureInfo
-               .append('a')
-               .attr('class', 'captured_by')
-               .attr('target', '_blank')
-               .attr('href', 'https://www.microsoft.com/en-us/maps/streetside')
-               .text('©' + yyyy + ' Microsoft');
+             if (osm) {
+               var missing = _coords.filter(function (loc) {
+                 return !osm.isDataLoaded(loc);
+               });
 
-             captureInfo
-               .append('span')
-               .text('|');
-           }
+               if (missing.length) {
+                 missing.forEach(function (loc) {
+                   context.loadTileAtLoc(loc);
+                 });
+                 return true;
+               }
+             }
 
-           if (d.captured_at) {
-             captureInfo
-               .append('span')
-               .attr('class', 'captured_at')
-               .text(localeTimestamp(d.captured_at));
-           }
-
-           // Add image links
-           let line2 = attribution
-             .append('div')
-             .attr('class', 'attribution-row');
-
-           line2
-             .append('a')
-             .attr('class', 'image-view-link')
-             .attr('target', '_blank')
-             .attr('href', 'https://www.bing.com/maps?cp=' + d.loc[1] + '~' + d.loc[0] +
-               '&lvl=17&dir=' + d.ca + '&style=x&v=2&sV=1')
-             .text(_t('streetside.view_on_bing'));
-
-           line2
-             .append('a')
-             .attr('class', 'image-report-link')
-             .attr('target', '_blank')
-             .attr('href', 'https://www.bing.com/maps/privacyreport/streetsideprivacyreport?bubbleid=' +
-               encodeURIComponent(d.key) + '&focus=photo&lat=' + d.loc[1] + '&lng=' + d.loc[0] + '&z=17')
-             .text(_t('streetside.report'));
-
-
-           let bubbleIdQuadKey = d.key.toString(4);
-           const paddingNeeded = 16 - bubbleIdQuadKey.length;
-           for (let i = 0; i < paddingNeeded; i++) {
-             bubbleIdQuadKey = '0' + bubbleIdQuadKey;
+             return false;
            }
-           const imgUrlPrefix = streetsideImagesApi + 'hs' + bubbleIdQuadKey;
-           const imgUrlSuffix = '.jpg?g=6338&n=z';
+         };
 
-           // Cubemap face code order matters here: front=01, right=02, back=03, left=10, up=11, down=12
-           const faceKeys = ['01','02','03','10','11','12'];
+         operation.tooltip = function () {
+           var disable = operation.disabled();
+           return disable ? _t('operations.orthogonalize.' + disable + '.' + _amount) : _t('operations.orthogonalize.description.' + _type + '.' + _amount);
+         };
 
-           // Map images to cube faces
-           let quadKeys = getQuadKeys();
-           let faces = faceKeys.map((faceKey) => {
-             return quadKeys.map((quadKey) =>{
-               const xy = qkToXY(quadKey);
-               return {
-                 face: faceKey,
-                 url: imgUrlPrefix + faceKey + quadKey + imgUrlSuffix,
-                 x: xy[0],
-                 y: xy[1]
-               };
-             });
+         operation.annotation = function () {
+           return _t('operations.orthogonalize.annotation.' + _type, {
+             n: _actions.length
            });
+         };
 
-           return loadFaces(faces)
-             .then(() => {
-               _sceneOptions = {
-                 showFullscreenCtrl: false,
-                 autoLoad: true,
-                 compass: true,
-                 northOffset: d.ca,
-                 yaw: 0,
-                 minHfov: minHfov,
-                 maxHfov: maxHfov,
-                 hfov: defaultHfov,
-                 type: 'cubemap',
-                 cubeMap: [
-                   _dataUrlArray[0],
-                   _dataUrlArray[1],
-                   _dataUrlArray[2],
-                   _dataUrlArray[3],
-                   _dataUrlArray[4],
-                   _dataUrlArray[5]
-                 ]
-               };
-               return { status: 'ok' };
-             });
-         },
+         operation.id = 'orthogonalize';
+         operation.keys = [_t('operations.orthogonalize.key')];
+         operation.title = _t('operations.orthogonalize.title');
+         operation.behavior = behaviorOperation(context).which(operation);
+         return operation;
+       }
+
+       function operationReflectShort(context, selectedIDs) {
+         return operationReflect(context, selectedIDs, 'short');
+       }
+       function operationReflectLong(context, selectedIDs) {
+         return operationReflect(context, selectedIDs, 'long');
+       }
+       function operationReflect(context, selectedIDs, axis) {
+         axis = axis || 'long';
+         var multi = selectedIDs.length === 1 ? 'single' : 'multiple';
+         var nodes = utilGetAllNodes(selectedIDs, context.graph());
+         var coords = nodes.map(function (n) {
+           return n.loc;
+         });
+         var extent = utilTotalExtent(selectedIDs, context.graph());
 
+         var operation = function operation() {
+           var action = actionReflect(selectedIDs, context.projection).useLongAxis(Boolean(axis === 'long'));
+           context.perform(action, operation.annotation());
+           window.setTimeout(function () {
+             context.validator().validate();
+           }, 300); // after any transition
+         };
 
-         getSequenceKeyForBubble: function(d) {
-           return d && d.sequenceKey;
-         },
+         operation.available = function () {
+           return nodes.length >= 3;
+         }; // don't cache this because the visible extent could change
+
+
+         operation.disabled = function () {
+           if (extent.percentContainedIn(context.map().extent()) < 0.8) {
+             return 'too_large';
+           } else if (someMissing()) {
+             return 'not_downloaded';
+           } else if (selectedIDs.some(context.hasHiddenConnections)) {
+             return 'connected_to_hidden';
+           } else if (selectedIDs.some(incompleteRelation)) {
+             return 'incomplete_relation';
+           }
+
+           return false;
 
+           function someMissing() {
+             if (context.inIntro()) return false;
+             var osm = context.connection();
 
-         // Updates the currently highlighted sequence and selected bubble.
-         // Reset is only necessary when interacting with the viewport because
-         // this implicitly changes the currently selected bubble/sequence
-         setStyles: function (context, hovered, reset) {
-           if (reset) {  // reset all layers
-             context.container().selectAll('.viewfield-group')
-               .classed('highlighted', false)
-               .classed('hovered', false)
-               .classed('currentView', false);
-
-             context.container().selectAll('.sequence')
-               .classed('highlighted', false)
-               .classed('currentView', false);
-           }
-
-           let hoveredBubbleKey = hovered && hovered.key;
-           let hoveredSequenceKey = this.getSequenceKeyForBubble(hovered);
-           let hoveredSequence = hoveredSequenceKey && _ssCache.sequences[hoveredSequenceKey];
-           let hoveredBubbleKeys =  (hoveredSequence && hoveredSequence.bubbles.map(d => d.key)) || [];
-
-           let viewer = context.container().select('.photoviewer');
-           let selected = viewer.empty() ? undefined : viewer.datum();
-           let selectedBubbleKey = selected && selected.key;
-           let selectedSequenceKey = this.getSequenceKeyForBubble(selected);
-           let selectedSequence = selectedSequenceKey && _ssCache.sequences[selectedSequenceKey];
-           let selectedBubbleKeys = (selectedSequence && selectedSequence.bubbles.map(d => d.key)) || [];
-
-           // highlight sibling viewfields on either the selected or the hovered sequences
-           let highlightedBubbleKeys = utilArrayUnion(hoveredBubbleKeys, selectedBubbleKeys);
-
-           context.container().selectAll('.layer-streetside-images .viewfield-group')
-             .classed('highlighted', d => highlightedBubbleKeys.indexOf(d.key) !== -1)
-             .classed('hovered',     d => d.key === hoveredBubbleKey)
-             .classed('currentView', d => d.key === selectedBubbleKey);
-
-           context.container().selectAll('.layer-streetside-images .sequence')
-             .classed('highlighted', d => d.properties.key === hoveredSequenceKey)
-             .classed('currentView', d => d.properties.key === selectedSequenceKey);
-
-           // update viewfields if needed
-           context.container().selectAll('.viewfield-group .viewfield')
-             .attr('d', viewfieldPath);
+             if (osm) {
+               var missing = coords.filter(function (loc) {
+                 return !osm.isDataLoaded(loc);
+               });
 
-           function viewfieldPath() {
-             let d = this.parentNode.__data__;
-             if (d.pano && d.key !== selectedBubbleKey) {
-               return 'M 8,13 m -10,0 a 10,10 0 1,0 20,0 a 10,10 0 1,0 -20,0';
-             } else {
-               return 'M 6,9 C 8,8.4 8,8.4 10,9 L 16,-2 C 12,-5 4,-5 0,-2 z';
+               if (missing.length) {
+                 missing.forEach(function (loc) {
+                   context.loadTileAtLoc(loc);
+                 });
+                 return true;
+               }
              }
+
+             return false;
            }
 
-           return this;
-         },
+           function incompleteRelation(id) {
+             var entity = context.entity(id);
+             return entity.type === 'relation' && !entity.isComplete(context.graph());
+           }
+         };
 
+         operation.tooltip = function () {
+           var disable = operation.disabled();
+           return disable ? _t('operations.reflect.' + disable + '.' + multi) : _t('operations.reflect.description.' + axis + '.' + multi);
+         };
 
-         /**
-          * cache().
-          */
-         cache: function () {
-           return _ssCache;
-         }
-       };
+         operation.annotation = function () {
+           return _t('operations.reflect.annotation.' + axis + '.feature', {
+             n: selectedIDs.length
+           });
+         };
 
-       var apibase$4 = 'https://taginfo.openstreetmap.org/api/4/';
-       var _inflight$2 = {};
-       var _popularKeys = {};
-       var _taginfoCache = {};
+         operation.id = 'reflect-' + axis;
+         operation.keys = [_t('operations.reflect.key.' + axis)];
+         operation.title = _t('operations.reflect.title.' + axis);
+         operation.behavior = behaviorOperation(context).which(operation);
+         return operation;
+       }
 
-       var tag_sorts = {
-           point: 'count_nodes',
-           vertex: 'count_nodes',
-           area: 'count_ways',
-           line: 'count_ways'
-       };
-       var tag_sort_members = {
-           point: 'count_node_members',
-           vertex: 'count_node_members',
-           area: 'count_way_members',
-           line: 'count_way_members',
-           relation: 'count_relation_members'
-       };
-       var tag_filters = {
-           point: 'nodes',
-           vertex: 'nodes',
-           area: 'ways',
-           line: 'ways'
-       };
-       var tag_members_fractions = {
-           point: 'count_node_members_fraction',
-           vertex: 'count_node_members_fraction',
-           area: 'count_way_members_fraction',
-           line: 'count_way_members_fraction',
-           relation: 'count_relation_members_fraction'
-       };
+       function operationMove(context, selectedIDs) {
+         var multi = selectedIDs.length === 1 ? 'single' : 'multiple';
+         var nodes = utilGetAllNodes(selectedIDs, context.graph());
+         var coords = nodes.map(function (n) {
+           return n.loc;
+         });
+         var extent = utilTotalExtent(selectedIDs, context.graph());
 
+         var operation = function operation() {
+           context.enter(modeMove(context, selectedIDs));
+         };
 
-       function sets(params, n, o) {
-           if (params.geometry && o[params.geometry]) {
-               params[n] = o[params.geometry];
-           }
-           return params;
-       }
+         operation.available = function () {
+           return selectedIDs.length > 1 || context.entity(selectedIDs[0]).type !== 'node';
+         };
 
+         operation.disabled = function () {
+           if (extent.percentContainedIn(context.map().extent()) < 0.8) {
+             return 'too_large';
+           } else if (someMissing()) {
+             return 'not_downloaded';
+           } else if (selectedIDs.some(context.hasHiddenConnections)) {
+             return 'connected_to_hidden';
+           } else if (selectedIDs.some(incompleteRelation)) {
+             return 'incomplete_relation';
+           }
 
-       function setFilter(params) {
-           return sets(params, 'filter', tag_filters);
-       }
+           return false;
 
+           function someMissing() {
+             if (context.inIntro()) return false;
+             var osm = context.connection();
 
-       function setSort(params) {
-           return sets(params, 'sortname', tag_sorts);
-       }
+             if (osm) {
+               var missing = coords.filter(function (loc) {
+                 return !osm.isDataLoaded(loc);
+               });
 
+               if (missing.length) {
+                 missing.forEach(function (loc) {
+                   context.loadTileAtLoc(loc);
+                 });
+                 return true;
+               }
+             }
 
-       function setSortMembers(params) {
-           return sets(params, 'sortname', tag_sort_members);
-       }
+             return false;
+           }
 
+           function incompleteRelation(id) {
+             var entity = context.entity(id);
+             return entity.type === 'relation' && !entity.isComplete(context.graph());
+           }
+         };
 
-       function clean(params) {
-           return utilObjectOmit(params, ['geometry', 'debounce']);
-       }
+         operation.tooltip = function () {
+           var disable = operation.disabled();
+           return disable ? _t('operations.move.' + disable + '.' + multi) : _t('operations.move.description.' + multi);
+         };
 
+         operation.annotation = function () {
+           return selectedIDs.length === 1 ? _t('operations.move.annotation.' + context.graph().geometry(selectedIDs[0])) : _t('operations.move.annotation.feature', {
+             n: selectedIDs.length
+           });
+         };
 
-       function filterKeys(type) {
-           var count_type = type ? 'count_' + type : 'count_all';
-           return function(d) {
-               return parseFloat(d[count_type]) > 2500 || d.in_wiki;
-           };
+         operation.id = 'move';
+         operation.keys = [_t('operations.move.key')];
+         operation.title = _t('operations.move.title');
+         operation.behavior = behaviorOperation(context).which(operation);
+         operation.mouseOnly = true;
+         return operation;
        }
 
+       function modeRotate(context, entityIDs) {
+         var mode = {
+           id: 'rotate',
+           button: 'browse'
+         };
+         var keybinding = utilKeybinding('rotate');
+         var behaviors = [behaviorEdit(context), operationCircularize(context, entityIDs).behavior, operationDelete(context, entityIDs).behavior, operationMove(context, entityIDs).behavior, operationOrthogonalize(context, entityIDs).behavior, operationReflectLong(context, entityIDs).behavior, operationReflectShort(context, entityIDs).behavior];
+         var annotation = entityIDs.length === 1 ? _t('operations.rotate.annotation.' + context.graph().geometry(entityIDs[0])) : _t('operations.rotate.annotation.feature', {
+           n: entityIDs.length
+         });
 
-       function filterMultikeys(prefix) {
-           return function(d) {
-               // d.key begins with prefix, and d.key contains no additional ':'s
-               var re = new RegExp('^' + prefix + '(.*)$');
-               var matches = d.key.match(re) || [];
-               return (matches.length === 2 && matches[1].indexOf(':') === -1);
-           };
-       }
+         var _prevGraph;
 
+         var _prevAngle;
 
-       function filterValues(allowUpperCase) {
-           return function(d) {
-               if (d.value.match(/[;,]/) !== null) return false;  // exclude some punctuation
-               if (!allowUpperCase && d.value.match(/[A-Z*]/) !== null) return false;  // exclude uppercase letters
-               return parseFloat(d.fraction) > 0.0;
-           };
-       }
+         var _prevTransform;
 
+         var _pivot;
 
-       function filterRoles(geometry) {
-           return function(d) {
-               if (d.role === '') return false; // exclude empty role
-               if (d.role.match(/[A-Z*;,]/) !== null) return false;  // exclude uppercase letters and some punctuation
-               return parseFloat(d[tag_members_fractions[geometry]]) > 0.0;
-           };
-       }
+         function doRotate() {
+           var fn;
 
+           if (context.graph() !== _prevGraph) {
+             fn = context.perform;
+           } else {
+             fn = context.replace;
+           } // projection changed, recalculate _pivot
 
-       function valKey(d) {
-           return {
-               value: d.key,
-               title: d.key
-           };
-       }
 
+           var projection = context.projection;
+           var currTransform = projection.transform();
 
-       function valKeyDescription(d) {
-           var obj = {
-               value: d.value,
-               title: d.description || d.value
-           };
-           if (d.count) {
-               obj.count = d.count;
+           if (!_prevTransform || currTransform.k !== _prevTransform.k || currTransform.x !== _prevTransform.x || currTransform.y !== _prevTransform.y) {
+             var nodes = utilGetAllNodes(entityIDs, context.graph());
+             var points = nodes.map(function (n) {
+               return projection(n.loc);
+             });
+             _pivot = getPivot(points);
+             _prevAngle = undefined;
            }
-           return obj;
-       }
 
+           var currMouse = context.map().mouse();
+           var currAngle = Math.atan2(currMouse[1] - _pivot[1], currMouse[0] - _pivot[0]);
+           if (typeof _prevAngle === 'undefined') _prevAngle = currAngle;
+           var delta = currAngle - _prevAngle;
+           fn(actionRotate(entityIDs, _pivot, delta, projection));
+           _prevTransform = currTransform;
+           _prevAngle = currAngle;
+           _prevGraph = context.graph();
+         }
 
-       function roleKey(d) {
-           return {
-               value: d.role,
-               title: d.role
-           };
-       }
+         function getPivot(points) {
+           var _pivot;
 
+           if (points.length === 1) {
+             _pivot = points[0];
+           } else if (points.length === 2) {
+             _pivot = geoVecInterp(points[0], points[1], 0.5);
+           } else {
+             var polygonHull = d3_polygonHull(points);
 
-       // sort keys with ':' lower than keys without ':'
-       function sortKeys(a, b) {
-           return (a.key.indexOf(':') === -1 && b.key.indexOf(':') !== -1) ? -1
-               : (a.key.indexOf(':') !== -1 && b.key.indexOf(':') === -1) ? 1
-               : 0;
-       }
+             if (polygonHull.length === 2) {
+               _pivot = geoVecInterp(points[0], points[1], 0.5);
+             } else {
+               _pivot = d3_polygonCentroid(d3_polygonHull(points));
+             }
+           }
 
+           return _pivot;
+         }
 
-       var debouncedRequest$1 = debounce(request$1, 300, { leading: false });
+         function finish(d3_event) {
+           d3_event.stopPropagation();
+           context.replace(actionNoop(), annotation);
+           context.enter(modeSelect(context, entityIDs));
+         }
 
-       function request$1(url, params, exactMatch, callback, loaded) {
-           if (_inflight$2[url]) return;
+         function cancel() {
+           context.pop();
+           context.enter(modeSelect(context, entityIDs));
+         }
 
-           if (checkCache(url, params, exactMatch, callback)) return;
+         function undone() {
+           context.enter(modeBrowse(context));
+         }
 
-           var controller = new AbortController();
-           _inflight$2[url] = controller;
+         mode.enter = function () {
+           context.features().forceVisible(entityIDs);
+           behaviors.forEach(context.install);
+           context.surface().on('mousemove.rotate', doRotate).on('click.rotate', finish);
+           context.history().on('undone.rotate', undone);
+           keybinding.on('⎋', cancel).on('↩', finish);
+           select(document).call(keybinding);
+         };
 
-           d3_json(url, { signal: controller.signal })
-               .then(function(result) {
-                   delete _inflight$2[url];
-                   if (loaded) loaded(null, result);
-               })
-               .catch(function(err) {
-                   delete _inflight$2[url];
-                   if (err.name === 'AbortError') return;
-                   if (loaded) loaded(err.message);
-               });
-       }
+         mode.exit = function () {
+           behaviors.forEach(context.uninstall);
+           context.surface().on('mousemove.rotate', null).on('click.rotate', null);
+           context.history().on('undone.rotate', null);
+           select(document).call(keybinding.unbind);
+           context.features().forceVisible([]);
+         };
 
+         mode.selectedIDs = function () {
+           if (!arguments.length) return entityIDs; // no assign
 
-       function checkCache(url, params, exactMatch, callback) {
-           var rp = params.rp || 25;
-           var testQuery = params.query || '';
-           var testUrl = url;
+           return mode;
+         };
 
-           do {
-               var hit = _taginfoCache[testUrl];
+         return mode;
+       }
 
-               // exact match, or shorter match yielding fewer than max results (rp)
-               if (hit && (url === testUrl || hit.length < rp)) {
-                   callback(null, hit);
-                   return true;
-               }
+       function operationRotate(context, selectedIDs) {
+         var multi = selectedIDs.length === 1 ? 'single' : 'multiple';
+         var nodes = utilGetAllNodes(selectedIDs, context.graph());
+         var coords = nodes.map(function (n) {
+           return n.loc;
+         });
+         var extent = utilTotalExtent(selectedIDs, context.graph());
 
-               // don't try to shorten the query
-               if (exactMatch || !testQuery.length) return false;
+         var operation = function operation() {
+           context.enter(modeRotate(context, selectedIDs));
+         };
+
+         operation.available = function () {
+           return nodes.length >= 2;
+         };
 
-               // do shorten the query to see if we already have a cached result
-               // that has returned fewer than max results (rp)
-               testQuery = testQuery.slice(0, -1);
-               testUrl = url.replace(/&query=(.*?)&/, '&query=' + testQuery + '&');
-           } while (testQuery.length >= 0);
+         operation.disabled = function () {
+           if (extent.percentContainedIn(context.map().extent()) < 0.8) {
+             return 'too_large';
+           } else if (someMissing()) {
+             return 'not_downloaded';
+           } else if (selectedIDs.some(context.hasHiddenConnections)) {
+             return 'connected_to_hidden';
+           } else if (selectedIDs.some(incompleteRelation)) {
+             return 'incomplete_relation';
+           }
 
            return false;
-       }
 
+           function someMissing() {
+             if (context.inIntro()) return false;
+             var osm = context.connection();
 
-       var serviceTaginfo = {
+             if (osm) {
+               var missing = coords.filter(function (loc) {
+                 return !osm.isDataLoaded(loc);
+               });
 
-           init: function() {
-               _inflight$2 = {};
-               _taginfoCache = {};
-               _popularKeys = {
-                   // manually exclude some keys – #5377, #7485
-                   postal_code: true,
-                   full_name: true,
-                   loc_name: true,
-                   reg_name: true,
-                   short_name: true,
-                   sorting_name: true,
-                   artist_name: true,
-                   nat_name: true,
-                   long_name: true,
-                   'bridge:name': true
-               };
+               if (missing.length) {
+                 missing.forEach(function (loc) {
+                   context.loadTileAtLoc(loc);
+                 });
+                 return true;
+               }
+             }
 
-               // Fetch popular keys.  We'll exclude these from `values`
-               // lookups because they stress taginfo, and they aren't likely
-               // to yield meaningful autocomplete results.. see #3955
-               var params = {
-                   rp: 100,
-                   sortname: 'values_all',
-                   sortorder: 'desc',
-                   page: 1,
-                   debounce: false,
-                   lang: _mainLocalizer.languageCode()
-               };
-               this.keys(params, function(err, data) {
-                   if (err) return;
-                   data.forEach(function(d) {
-                       if (d.value === 'opening_hours') return;  // exception
-                       _popularKeys[d.value] = true;
-                   });
-               });
-           },
+             return false;
+           }
 
+           function incompleteRelation(id) {
+             var entity = context.entity(id);
+             return entity.type === 'relation' && !entity.isComplete(context.graph());
+           }
+         };
 
-           reset: function() {
-               Object.values(_inflight$2).forEach(function(controller) { controller.abort(); });
-               _inflight$2 = {};
-           },
+         operation.tooltip = function () {
+           var disable = operation.disabled();
+           return disable ? _t('operations.rotate.' + disable + '.' + multi) : _t('operations.rotate.description.' + multi);
+         };
 
+         operation.annotation = function () {
+           return selectedIDs.length === 1 ? _t('operations.rotate.annotation.' + context.graph().geometry(selectedIDs[0])) : _t('operations.rotate.annotation.feature', {
+             n: selectedIDs.length
+           });
+         };
 
-           keys: function(params, callback) {
-               var doRequest = params.debounce ? debouncedRequest$1 : request$1;
-               params = clean(setSort(params));
-               params = Object.assign({
-                   rp: 10,
-                   sortname: 'count_all',
-                   sortorder: 'desc',
-                   page: 1,
-                   lang: _mainLocalizer.languageCode()
-               }, params);
+         operation.id = 'rotate';
+         operation.keys = [_t('operations.rotate.key')];
+         operation.title = _t('operations.rotate.title');
+         operation.behavior = behaviorOperation(context).which(operation);
+         operation.mouseOnly = true;
+         return operation;
+       }
 
-               var url = apibase$4 + 'keys/all?' + utilQsString(params);
-               doRequest(url, params, false, callback, function(err, d) {
-                   if (err) {
-                       callback(err);
-                   } else {
-                       var f = filterKeys(params.filter);
-                       var result = d.data.filter(f).sort(sortKeys).map(valKey);
-                       _taginfoCache[url] = result;
-                       callback(null, result);
-                   }
-               });
-           },
+       function modeMove(context, entityIDs, baseGraph) {
+         var mode = {
+           id: 'move',
+           button: 'browse'
+         };
+         var keybinding = utilKeybinding('move');
+         var behaviors = [behaviorEdit(context), operationCircularize(context, entityIDs).behavior, operationDelete(context, entityIDs).behavior, operationOrthogonalize(context, entityIDs).behavior, operationReflectLong(context, entityIDs).behavior, operationReflectShort(context, entityIDs).behavior, operationRotate(context, entityIDs).behavior];
+         var annotation = entityIDs.length === 1 ? _t('operations.move.annotation.' + context.graph().geometry(entityIDs[0])) : _t('operations.move.annotation.feature', {
+           n: entityIDs.length
+         });
 
+         var _prevGraph;
 
-           multikeys: function(params, callback) {
-               var doRequest = params.debounce ? debouncedRequest$1 : request$1;
-               params = clean(setSort(params));
-               params = Object.assign({
-                   rp: 25,
-                   sortname: 'count_all',
-                   sortorder: 'desc',
-                   page: 1,
-                   lang: _mainLocalizer.languageCode()
-               }, params);
-
-               var prefix = params.query;
-               var url = apibase$4 + 'keys/all?' + utilQsString(params);
-               doRequest(url, params, true, callback, function(err, d) {
-                   if (err) {
-                       callback(err);
-                   } else {
-                       var f = filterMultikeys(prefix);
-                       var result = d.data.filter(f).map(valKey);
-                       _taginfoCache[url] = result;
-                       callback(null, result);
-                   }
-               });
-           },
+         var _cache;
 
+         var _origin;
 
-           values: function(params, callback) {
-               // Exclude popular keys from values lookups.. see #3955
-               var key = params.key;
-               if (key && _popularKeys[key]) {
-                   callback(null, []);
-                   return;
-               }
+         var _nudgeInterval;
 
-               var doRequest = params.debounce ? debouncedRequest$1 : request$1;
-               params = clean(setSort(setFilter(params)));
-               params = Object.assign({
-                   rp: 25,
-                   sortname: 'count_all',
-                   sortorder: 'desc',
-                   page: 1,
-                   lang: _mainLocalizer.languageCode()
-               }, params);
+         function doMove(nudge) {
+           nudge = nudge || [0, 0];
+           var fn;
 
-               var url = apibase$4 + 'key/values?' + utilQsString(params);
-               doRequest(url, params, false, callback, function(err, d) {
-                   if (err) {
-                       callback(err);
-                   } else {
-                       // In most cases we prefer taginfo value results with lowercase letters.
-                       // A few OSM keys expect values to contain uppercase values (see #3377).
-                       // This is not an exhaustive list (e.g. `name` also has uppercase values)
-                       // but these are the fields where taginfo value lookup is most useful.
-                       var re = /network|taxon|genus|species|brand|grape_variety|royal_cypher|listed_status|booth|rating|stars|:output|_hours|_times|_ref|manufacturer|country|target|brewery/;
-                       var allowUpperCase = re.test(params.key);
-                       var f = filterValues(allowUpperCase);
-
-                       var result = d.data.filter(f).map(valKeyDescription);
-                       _taginfoCache[url] = result;
-                       callback(null, result);
-                   }
-               });
-           },
+           if (_prevGraph !== context.graph()) {
+             _cache = {};
+             _origin = context.map().mouseCoordinates();
+             fn = context.perform;
+           } else {
+             fn = context.overwrite;
+           }
 
+           var currMouse = context.map().mouse();
+           var origMouse = context.projection(_origin);
+           var delta = geoVecSubtract(geoVecSubtract(currMouse, origMouse), nudge);
+           fn(actionMove(entityIDs, delta, context.projection, _cache));
+           _prevGraph = context.graph();
+         }
 
-           roles: function(params, callback) {
-               var doRequest = params.debounce ? debouncedRequest$1 : request$1;
-               var geometry = params.geometry;
-               params = clean(setSortMembers(params));
-               params = Object.assign({
-                   rp: 25,
-                   sortname: 'count_all_members',
-                   sortorder: 'desc',
-                   page: 1,
-                   lang: _mainLocalizer.languageCode()
-               }, params);
-
-               var url = apibase$4 + 'relation/roles?' + utilQsString(params);
-               doRequest(url, params, true, callback, function(err, d) {
-                   if (err) {
-                       callback(err);
-                   } else {
-                       var f = filterRoles(geometry);
-                       var result = d.data.filter(f).map(roleKey);
-                       _taginfoCache[url] = result;
-                       callback(null, result);
-                   }
-               });
-           },
+         function startNudge(nudge) {
+           if (_nudgeInterval) window.clearInterval(_nudgeInterval);
+           _nudgeInterval = window.setInterval(function () {
+             context.map().pan(nudge);
+             doMove(nudge);
+           }, 50);
+         }
 
+         function stopNudge() {
+           if (_nudgeInterval) {
+             window.clearInterval(_nudgeInterval);
+             _nudgeInterval = null;
+           }
+         }
 
-           docs: function(params, callback) {
-               var doRequest = params.debounce ? debouncedRequest$1 : request$1;
-               params = clean(setSort(params));
+         function move() {
+           doMove();
+           var nudge = geoViewportEdge(context.map().mouse(), context.map().dimensions());
 
-               var path = 'key/wiki_pages?';
-               if (params.value) {
-                   path = 'tag/wiki_pages?';
-               } else if (params.rtype) {
-                   path = 'relation/wiki_pages?';
-               }
+           if (nudge) {
+             startNudge(nudge);
+           } else {
+             stopNudge();
+           }
+         }
 
-               var url = apibase$4 + path + utilQsString(params);
-               doRequest(url, params, true, callback, function(err, d) {
-                   if (err) {
-                       callback(err);
-                   } else {
-                       _taginfoCache[url] = d.data;
-                       callback(null, d.data);
-                   }
-               });
-           },
+         function finish(d3_event) {
+           d3_event.stopPropagation();
+           context.replace(actionNoop(), annotation);
+           context.enter(modeSelect(context, entityIDs));
+           stopNudge();
+         }
 
+         function cancel() {
+           if (baseGraph) {
+             while (context.graph() !== baseGraph) {
+               context.pop();
+             }
 
-           apibase: function(_) {
-               if (!arguments.length) return apibase$4;
-               apibase$4 = _;
-               return this;
+             context.enter(modeBrowse(context));
+           } else {
+             context.pop();
+             context.enter(modeSelect(context, entityIDs));
            }
 
-       };
+           stopNudge();
+         }
 
-       var helpers$1 = createCommonjsModule(function (module, exports) {
-       Object.defineProperty(exports, "__esModule", { value: true });
-       /**
-        * @module helpers
-        */
-       /**
-        * Earth Radius used with the Harvesine formula and approximates using a spherical (non-ellipsoid) Earth.
-        *
-        * @memberof helpers
-        * @type {number}
-        */
-       exports.earthRadius = 6371008.8;
-       /**
-        * Unit of measurement factors using a spherical (non-ellipsoid) earth radius.
-        *
-        * @memberof helpers
-        * @type {Object}
-        */
-       exports.factors = {
-           centimeters: exports.earthRadius * 100,
-           centimetres: exports.earthRadius * 100,
-           degrees: exports.earthRadius / 111325,
-           feet: exports.earthRadius * 3.28084,
-           inches: exports.earthRadius * 39.370,
-           kilometers: exports.earthRadius / 1000,
-           kilometres: exports.earthRadius / 1000,
-           meters: exports.earthRadius,
-           metres: exports.earthRadius,
-           miles: exports.earthRadius / 1609.344,
-           millimeters: exports.earthRadius * 1000,
-           millimetres: exports.earthRadius * 1000,
-           nauticalmiles: exports.earthRadius / 1852,
-           radians: 1,
-           yards: exports.earthRadius / 1.0936,
-       };
-       /**
-        * Units of measurement factors based on 1 meter.
-        *
-        * @memberof helpers
-        * @type {Object}
-        */
-       exports.unitsFactors = {
-           centimeters: 100,
-           centimetres: 100,
-           degrees: 1 / 111325,
-           feet: 3.28084,
-           inches: 39.370,
-           kilometers: 1 / 1000,
-           kilometres: 1 / 1000,
-           meters: 1,
-           metres: 1,
-           miles: 1 / 1609.344,
-           millimeters: 1000,
-           millimetres: 1000,
-           nauticalmiles: 1 / 1852,
-           radians: 1 / exports.earthRadius,
-           yards: 1 / 1.0936,
-       };
-       /**
-        * Area of measurement factors based on 1 square meter.
-        *
-        * @memberof helpers
-        * @type {Object}
-        */
-       exports.areaFactors = {
-           acres: 0.000247105,
-           centimeters: 10000,
-           centimetres: 10000,
-           feet: 10.763910417,
-           inches: 1550.003100006,
-           kilometers: 0.000001,
-           kilometres: 0.000001,
-           meters: 1,
-           metres: 1,
-           miles: 3.86e-7,
-           millimeters: 1000000,
-           millimetres: 1000000,
-           yards: 1.195990046,
-       };
-       /**
-        * Wraps a GeoJSON {@link Geometry} in a GeoJSON {@link Feature}.
-        *
-        * @name feature
-        * @param {Geometry} geometry input geometry
-        * @param {Object} [properties={}] an Object of key-value pairs to add as properties
-        * @param {Object} [options={}] Optional Parameters
-        * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
-        * @param {string|number} [options.id] Identifier associated with the Feature
-        * @returns {Feature} a GeoJSON Feature
-        * @example
-        * var geometry = {
-        *   "type": "Point",
-        *   "coordinates": [110, 50]
-        * };
-        *
-        * var feature = turf.feature(geometry);
-        *
-        * //=feature
-        */
-       function feature(geom, properties, options) {
-           if (options === void 0) { options = {}; }
-           var feat = { type: "Feature" };
-           if (options.id === 0 || options.id) {
-               feat.id = options.id;
-           }
-           if (options.bbox) {
-               feat.bbox = options.bbox;
-           }
-           feat.properties = properties || {};
-           feat.geometry = geom;
-           return feat;
-       }
-       exports.feature = feature;
-       /**
-        * Creates a GeoJSON {@link Geometry} from a Geometry string type & coordinates.
-        * For GeometryCollection type use `helpers.geometryCollection`
-        *
-        * @name geometry
-        * @param {string} type Geometry Type
-        * @param {Array<any>} coordinates Coordinates
-        * @param {Object} [options={}] Optional Parameters
-        * @returns {Geometry} a GeoJSON Geometry
-        * @example
-        * var type = "Point";
-        * var coordinates = [110, 50];
-        * var geometry = turf.geometry(type, coordinates);
-        * // => geometry
-        */
-       function geometry(type, coordinates, options) {
-           switch (type) {
-               case "Point": return point(coordinates).geometry;
-               case "LineString": return lineString(coordinates).geometry;
-               case "Polygon": return polygon(coordinates).geometry;
-               case "MultiPoint": return multiPoint(coordinates).geometry;
-               case "MultiLineString": return multiLineString(coordinates).geometry;
-               case "MultiPolygon": return multiPolygon(coordinates).geometry;
-               default: throw new Error(type + " is invalid");
-           }
-       }
-       exports.geometry = geometry;
-       /**
-        * Creates a {@link Point} {@link Feature} from a Position.
-        *
-        * @name point
-        * @param {Array<number>} coordinates longitude, latitude position (each in decimal degrees)
-        * @param {Object} [properties={}] an Object of key-value pairs to add as properties
-        * @param {Object} [options={}] Optional Parameters
-        * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
-        * @param {string|number} [options.id] Identifier associated with the Feature
-        * @returns {Feature<Point>} a Point feature
-        * @example
-        * var point = turf.point([-75.343, 39.984]);
-        *
-        * //=point
-        */
-       function point(coordinates, properties, options) {
-           if (options === void 0) { options = {}; }
-           var geom = {
-               type: "Point",
-               coordinates: coordinates,
-           };
-           return feature(geom, properties, options);
-       }
-       exports.point = point;
-       /**
-        * Creates a {@link Point} {@link FeatureCollection} from an Array of Point coordinates.
-        *
-        * @name points
-        * @param {Array<Array<number>>} coordinates an array of Points
-        * @param {Object} [properties={}] Translate these properties to each Feature
-        * @param {Object} [options={}] Optional Parameters
-        * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north]
-        * associated with the FeatureCollection
-        * @param {string|number} [options.id] Identifier associated with the FeatureCollection
-        * @returns {FeatureCollection<Point>} Point Feature
-        * @example
-        * var points = turf.points([
-        *   [-75, 39],
-        *   [-80, 45],
-        *   [-78, 50]
-        * ]);
-        *
-        * //=points
-        */
-       function points(coordinates, properties, options) {
-           if (options === void 0) { options = {}; }
-           return featureCollection(coordinates.map(function (coords) {
-               return point(coords, properties);
-           }), options);
-       }
-       exports.points = points;
-       /**
-        * Creates a {@link Polygon} {@link Feature} from an Array of LinearRings.
-        *
-        * @name polygon
-        * @param {Array<Array<Array<number>>>} coordinates an array of LinearRings
-        * @param {Object} [properties={}] an Object of key-value pairs to add as properties
-        * @param {Object} [options={}] Optional Parameters
-        * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
-        * @param {string|number} [options.id] Identifier associated with the Feature
-        * @returns {Feature<Polygon>} Polygon Feature
-        * @example
-        * var polygon = turf.polygon([[[-5, 52], [-4, 56], [-2, 51], [-7, 54], [-5, 52]]], { name: 'poly1' });
-        *
-        * //=polygon
-        */
-       function polygon(coordinates, properties, options) {
-           if (options === void 0) { options = {}; }
-           for (var _i = 0, coordinates_1 = coordinates; _i < coordinates_1.length; _i++) {
-               var ring = coordinates_1[_i];
-               if (ring.length < 4) {
-                   throw new Error("Each LinearRing of a Polygon must have 4 or more Positions.");
-               }
-               for (var j = 0; j < ring[ring.length - 1].length; j++) {
-                   // Check if first point of Polygon contains two numbers
-                   if (ring[ring.length - 1][j] !== ring[0][j]) {
-                       throw new Error("First and last Position are not equivalent.");
-                   }
-               }
-           }
-           var geom = {
-               type: "Polygon",
-               coordinates: coordinates,
-           };
-           return feature(geom, properties, options);
-       }
-       exports.polygon = polygon;
-       /**
-        * Creates a {@link Polygon} {@link FeatureCollection} from an Array of Polygon coordinates.
-        *
-        * @name polygons
-        * @param {Array<Array<Array<Array<number>>>>} coordinates an array of Polygon coordinates
-        * @param {Object} [properties={}] an Object of key-value pairs to add as properties
-        * @param {Object} [options={}] Optional Parameters
-        * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
-        * @param {string|number} [options.id] Identifier associated with the FeatureCollection
-        * @returns {FeatureCollection<Polygon>} Polygon FeatureCollection
-        * @example
-        * var polygons = turf.polygons([
-        *   [[[-5, 52], [-4, 56], [-2, 51], [-7, 54], [-5, 52]]],
-        *   [[[-15, 42], [-14, 46], [-12, 41], [-17, 44], [-15, 42]]],
-        * ]);
-        *
-        * //=polygons
-        */
-       function polygons(coordinates, properties, options) {
-           if (options === void 0) { options = {}; }
-           return featureCollection(coordinates.map(function (coords) {
-               return polygon(coords, properties);
-           }), options);
-       }
-       exports.polygons = polygons;
-       /**
-        * Creates a {@link LineString} {@link Feature} from an Array of Positions.
-        *
-        * @name lineString
-        * @param {Array<Array<number>>} coordinates an array of Positions
-        * @param {Object} [properties={}] an Object of key-value pairs to add as properties
-        * @param {Object} [options={}] Optional Parameters
-        * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
-        * @param {string|number} [options.id] Identifier associated with the Feature
-        * @returns {Feature<LineString>} LineString Feature
-        * @example
-        * var linestring1 = turf.lineString([[-24, 63], [-23, 60], [-25, 65], [-20, 69]], {name: 'line 1'});
-        * var linestring2 = turf.lineString([[-14, 43], [-13, 40], [-15, 45], [-10, 49]], {name: 'line 2'});
-        *
-        * //=linestring1
-        * //=linestring2
-        */
-       function lineString(coordinates, properties, options) {
-           if (options === void 0) { options = {}; }
-           if (coordinates.length < 2) {
-               throw new Error("coordinates must be an array of two or more positions");
-           }
-           var geom = {
-               type: "LineString",
-               coordinates: coordinates,
-           };
-           return feature(geom, properties, options);
-       }
-       exports.lineString = lineString;
-       /**
-        * Creates a {@link LineString} {@link FeatureCollection} from an Array of LineString coordinates.
-        *
-        * @name lineStrings
-        * @param {Array<Array<Array<number>>>} coordinates an array of LinearRings
-        * @param {Object} [properties={}] an Object of key-value pairs to add as properties
-        * @param {Object} [options={}] Optional Parameters
-        * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north]
-        * associated with the FeatureCollection
-        * @param {string|number} [options.id] Identifier associated with the FeatureCollection
-        * @returns {FeatureCollection<LineString>} LineString FeatureCollection
-        * @example
-        * var linestrings = turf.lineStrings([
-        *   [[-24, 63], [-23, 60], [-25, 65], [-20, 69]],
-        *   [[-14, 43], [-13, 40], [-15, 45], [-10, 49]]
-        * ]);
-        *
-        * //=linestrings
-        */
-       function lineStrings(coordinates, properties, options) {
-           if (options === void 0) { options = {}; }
-           return featureCollection(coordinates.map(function (coords) {
-               return lineString(coords, properties);
-           }), options);
-       }
-       exports.lineStrings = lineStrings;
-       /**
-        * Takes one or more {@link Feature|Features} and creates a {@link FeatureCollection}.
-        *
-        * @name featureCollection
-        * @param {Feature[]} features input features
-        * @param {Object} [options={}] Optional Parameters
-        * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
-        * @param {string|number} [options.id] Identifier associated with the Feature
-        * @returns {FeatureCollection} FeatureCollection of Features
-        * @example
-        * var locationA = turf.point([-75.343, 39.984], {name: 'Location A'});
-        * var locationB = turf.point([-75.833, 39.284], {name: 'Location B'});
-        * var locationC = turf.point([-75.534, 39.123], {name: 'Location C'});
-        *
-        * var collection = turf.featureCollection([
-        *   locationA,
-        *   locationB,
-        *   locationC
-        * ]);
-        *
-        * //=collection
-        */
-       function featureCollection(features, options) {
-           if (options === void 0) { options = {}; }
-           var fc = { type: "FeatureCollection" };
-           if (options.id) {
-               fc.id = options.id;
-           }
-           if (options.bbox) {
-               fc.bbox = options.bbox;
-           }
-           fc.features = features;
-           return fc;
-       }
-       exports.featureCollection = featureCollection;
-       /**
-        * Creates a {@link Feature<MultiLineString>} based on a
-        * coordinate array. Properties can be added optionally.
-        *
-        * @name multiLineString
-        * @param {Array<Array<Array<number>>>} coordinates an array of LineStrings
-        * @param {Object} [properties={}] an Object of key-value pairs to add as properties
-        * @param {Object} [options={}] Optional Parameters
-        * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
-        * @param {string|number} [options.id] Identifier associated with the Feature
-        * @returns {Feature<MultiLineString>} a MultiLineString feature
-        * @throws {Error} if no coordinates are passed
-        * @example
-        * var multiLine = turf.multiLineString([[[0,0],[10,10]]]);
-        *
-        * //=multiLine
-        */
-       function multiLineString(coordinates, properties, options) {
-           if (options === void 0) { options = {}; }
-           var geom = {
-               type: "MultiLineString",
-               coordinates: coordinates,
-           };
-           return feature(geom, properties, options);
-       }
-       exports.multiLineString = multiLineString;
-       /**
-        * Creates a {@link Feature<MultiPoint>} based on a
-        * coordinate array. Properties can be added optionally.
-        *
-        * @name multiPoint
-        * @param {Array<Array<number>>} coordinates an array of Positions
-        * @param {Object} [properties={}] an Object of key-value pairs to add as properties
-        * @param {Object} [options={}] Optional Parameters
-        * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
-        * @param {string|number} [options.id] Identifier associated with the Feature
-        * @returns {Feature<MultiPoint>} a MultiPoint feature
-        * @throws {Error} if no coordinates are passed
-        * @example
-        * var multiPt = turf.multiPoint([[0,0],[10,10]]);
-        *
-        * //=multiPt
-        */
-       function multiPoint(coordinates, properties, options) {
-           if (options === void 0) { options = {}; }
-           var geom = {
-               type: "MultiPoint",
-               coordinates: coordinates,
-           };
-           return feature(geom, properties, options);
-       }
-       exports.multiPoint = multiPoint;
-       /**
-        * Creates a {@link Feature<MultiPolygon>} based on a
-        * coordinate array. Properties can be added optionally.
-        *
-        * @name multiPolygon
-        * @param {Array<Array<Array<Array<number>>>>} coordinates an array of Polygons
-        * @param {Object} [properties={}] an Object of key-value pairs to add as properties
-        * @param {Object} [options={}] Optional Parameters
-        * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
-        * @param {string|number} [options.id] Identifier associated with the Feature
-        * @returns {Feature<MultiPolygon>} a multipolygon feature
-        * @throws {Error} if no coordinates are passed
-        * @example
-        * var multiPoly = turf.multiPolygon([[[[0,0],[0,10],[10,10],[10,0],[0,0]]]]);
-        *
-        * //=multiPoly
-        *
-        */
-       function multiPolygon(coordinates, properties, options) {
-           if (options === void 0) { options = {}; }
-           var geom = {
-               type: "MultiPolygon",
-               coordinates: coordinates,
-           };
-           return feature(geom, properties, options);
-       }
-       exports.multiPolygon = multiPolygon;
-       /**
-        * Creates a {@link Feature<GeometryCollection>} based on a
-        * coordinate array. Properties can be added optionally.
-        *
-        * @name geometryCollection
-        * @param {Array<Geometry>} geometries an array of GeoJSON Geometries
-        * @param {Object} [properties={}] an Object of key-value pairs to add as properties
-        * @param {Object} [options={}] Optional Parameters
-        * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
-        * @param {string|number} [options.id] Identifier associated with the Feature
-        * @returns {Feature<GeometryCollection>} a GeoJSON GeometryCollection Feature
-        * @example
-        * var pt = turf.geometry("Point", [100, 0]);
-        * var line = turf.geometry("LineString", [[101, 0], [102, 1]]);
-        * var collection = turf.geometryCollection([pt, line]);
-        *
-        * // => collection
-        */
-       function geometryCollection(geometries, properties, options) {
-           if (options === void 0) { options = {}; }
-           var geom = {
-               type: "GeometryCollection",
-               geometries: geometries,
-           };
-           return feature(geom, properties, options);
-       }
-       exports.geometryCollection = geometryCollection;
-       /**
-        * Round number to precision
-        *
-        * @param {number} num Number
-        * @param {number} [precision=0] Precision
-        * @returns {number} rounded number
-        * @example
-        * turf.round(120.4321)
-        * //=120
-        *
-        * turf.round(120.4321, 2)
-        * //=120.43
-        */
-       function round(num, precision) {
-           if (precision === void 0) { precision = 0; }
-           if (precision && !(precision >= 0)) {
-               throw new Error("precision must be a positive number");
-           }
-           var multiplier = Math.pow(10, precision || 0);
-           return Math.round(num * multiplier) / multiplier;
-       }
-       exports.round = round;
-       /**
-        * Convert a distance measurement (assuming a spherical Earth) from radians to a more friendly unit.
-        * Valid units: miles, nauticalmiles, inches, yards, meters, metres, kilometers, centimeters, feet
-        *
-        * @name radiansToLength
-        * @param {number} radians in radians across the sphere
-        * @param {string} [units="kilometers"] can be degrees, radians, miles, or kilometers inches, yards, metres,
-        * meters, kilometres, kilometers.
-        * @returns {number} distance
-        */
-       function radiansToLength(radians, units) {
-           if (units === void 0) { units = "kilometers"; }
-           var factor = exports.factors[units];
-           if (!factor) {
-               throw new Error(units + " units is invalid");
-           }
-           return radians * factor;
-       }
-       exports.radiansToLength = radiansToLength;
-       /**
-        * Convert a distance measurement (assuming a spherical Earth) from a real-world unit into radians
-        * Valid units: miles, nauticalmiles, inches, yards, meters, metres, kilometers, centimeters, feet
-        *
-        * @name lengthToRadians
-        * @param {number} distance in real units
-        * @param {string} [units="kilometers"] can be degrees, radians, miles, or kilometers inches, yards, metres,
-        * meters, kilometres, kilometers.
-        * @returns {number} radians
-        */
-       function lengthToRadians(distance, units) {
-           if (units === void 0) { units = "kilometers"; }
-           var factor = exports.factors[units];
-           if (!factor) {
-               throw new Error(units + " units is invalid");
-           }
-           return distance / factor;
-       }
-       exports.lengthToRadians = lengthToRadians;
-       /**
-        * Convert a distance measurement (assuming a spherical Earth) from a real-world unit into degrees
-        * Valid units: miles, nauticalmiles, inches, yards, meters, metres, centimeters, kilometres, feet
-        *
-        * @name lengthToDegrees
-        * @param {number} distance in real units
-        * @param {string} [units="kilometers"] can be degrees, radians, miles, or kilometers inches, yards, metres,
-        * meters, kilometres, kilometers.
-        * @returns {number} degrees
-        */
-       function lengthToDegrees(distance, units) {
-           return radiansToDegrees(lengthToRadians(distance, units));
-       }
-       exports.lengthToDegrees = lengthToDegrees;
-       /**
-        * Converts any bearing angle from the north line direction (positive clockwise)
-        * and returns an angle between 0-360 degrees (positive clockwise), 0 being the north line
-        *
-        * @name bearingToAzimuth
-        * @param {number} bearing angle, between -180 and +180 degrees
-        * @returns {number} angle between 0 and 360 degrees
-        */
-       function bearingToAzimuth(bearing) {
-           var angle = bearing % 360;
-           if (angle < 0) {
-               angle += 360;
-           }
-           return angle;
-       }
-       exports.bearingToAzimuth = bearingToAzimuth;
-       /**
-        * Converts an angle in radians to degrees
-        *
-        * @name radiansToDegrees
-        * @param {number} radians angle in radians
-        * @returns {number} degrees between 0 and 360 degrees
-        */
-       function radiansToDegrees(radians) {
-           var degrees = radians % (2 * Math.PI);
-           return degrees * 180 / Math.PI;
-       }
-       exports.radiansToDegrees = radiansToDegrees;
-       /**
-        * Converts an angle in degrees to radians
-        *
-        * @name degreesToRadians
-        * @param {number} degrees angle between 0 and 360 degrees
-        * @returns {number} angle in radians
-        */
-       function degreesToRadians(degrees) {
-           var radians = degrees % 360;
-           return radians * Math.PI / 180;
-       }
-       exports.degreesToRadians = degreesToRadians;
-       /**
-        * Converts a length to the requested unit.
-        * Valid units: miles, nauticalmiles, inches, yards, meters, metres, kilometers, centimeters, feet
-        *
-        * @param {number} length to be converted
-        * @param {Units} [originalUnit="kilometers"] of the length
-        * @param {Units} [finalUnit="kilometers"] returned unit
-        * @returns {number} the converted length
-        */
-       function convertLength(length, originalUnit, finalUnit) {
-           if (originalUnit === void 0) { originalUnit = "kilometers"; }
-           if (finalUnit === void 0) { finalUnit = "kilometers"; }
-           if (!(length >= 0)) {
-               throw new Error("length must be a positive number");
-           }
-           return radiansToLength(lengthToRadians(length, originalUnit), finalUnit);
-       }
-       exports.convertLength = convertLength;
-       /**
-        * Converts a area to the requested unit.
-        * Valid units: kilometers, kilometres, meters, metres, centimetres, millimeters, acres, miles, yards, feet, inches
-        * @param {number} area to be converted
-        * @param {Units} [originalUnit="meters"] of the distance
-        * @param {Units} [finalUnit="kilometers"] returned unit
-        * @returns {number} the converted distance
-        */
-       function convertArea(area, originalUnit, finalUnit) {
-           if (originalUnit === void 0) { originalUnit = "meters"; }
-           if (finalUnit === void 0) { finalUnit = "kilometers"; }
-           if (!(area >= 0)) {
-               throw new Error("area must be a positive number");
-           }
-           var startFactor = exports.areaFactors[originalUnit];
-           if (!startFactor) {
-               throw new Error("invalid original units");
-           }
-           var finalFactor = exports.areaFactors[finalUnit];
-           if (!finalFactor) {
-               throw new Error("invalid final units");
-           }
-           return (area / startFactor) * finalFactor;
-       }
-       exports.convertArea = convertArea;
-       /**
-        * isNumber
-        *
-        * @param {*} num Number to validate
-        * @returns {boolean} true/false
-        * @example
-        * turf.isNumber(123)
-        * //=true
-        * turf.isNumber('foo')
-        * //=false
-        */
-       function isNumber(num) {
-           return !isNaN(num) && num !== null && !Array.isArray(num) && !/^\s*$/.test(num);
-       }
-       exports.isNumber = isNumber;
-       /**
-        * isObject
-        *
-        * @param {*} input variable to validate
-        * @returns {boolean} true/false
-        * @example
-        * turf.isObject({elevation: 10})
-        * //=true
-        * turf.isObject('foo')
-        * //=false
-        */
-       function isObject(input) {
-           return (!!input) && (input.constructor === Object);
-       }
-       exports.isObject = isObject;
-       /**
-        * Validate BBox
-        *
-        * @private
-        * @param {Array<number>} bbox BBox to validate
-        * @returns {void}
-        * @throws Error if BBox is not valid
-        * @example
-        * validateBBox([-180, -40, 110, 50])
-        * //=OK
-        * validateBBox([-180, -40])
-        * //=Error
-        * validateBBox('Foo')
-        * //=Error
-        * validateBBox(5)
-        * //=Error
-        * validateBBox(null)
-        * //=Error
-        * validateBBox(undefined)
-        * //=Error
-        */
-       function validateBBox(bbox) {
-           if (!bbox) {
-               throw new Error("bbox is required");
-           }
-           if (!Array.isArray(bbox)) {
-               throw new Error("bbox must be an Array");
-           }
-           if (bbox.length !== 4 && bbox.length !== 6) {
-               throw new Error("bbox must be an Array of 4 or 6 numbers");
-           }
-           bbox.forEach(function (num) {
-               if (!isNumber(num)) {
-                   throw new Error("bbox must only contain numbers");
-               }
+         function undone() {
+           context.enter(modeBrowse(context));
+         }
+
+         mode.enter = function () {
+           _origin = context.map().mouseCoordinates();
+           _prevGraph = null;
+           _cache = {};
+           context.features().forceVisible(entityIDs);
+           behaviors.forEach(context.install);
+           context.surface().on('mousemove.move', move).on('click.move', finish);
+           context.history().on('undone.move', undone);
+           keybinding.on('⎋', cancel).on('↩', finish);
+           select(document).call(keybinding);
+         };
+
+         mode.exit = function () {
+           stopNudge();
+           behaviors.forEach(function (behavior) {
+             context.uninstall(behavior);
            });
+           context.surface().on('mousemove.move', null).on('click.move', null);
+           context.history().on('undone.move', null);
+           select(document).call(keybinding.unbind);
+           context.features().forceVisible([]);
+         };
+
+         mode.selectedIDs = function () {
+           if (!arguments.length) return entityIDs; // no assign
+
+           return mode;
+         };
+
+         return mode;
        }
-       exports.validateBBox = validateBBox;
-       /**
-        * Validate Id
-        *
-        * @private
-        * @param {string|number} id Id to validate
-        * @returns {void}
-        * @throws Error if Id is not valid
-        * @example
-        * validateId([-180, -40, 110, 50])
-        * //=Error
-        * validateId([-180, -40])
-        * //=Error
-        * validateId('Foo')
-        * //=OK
-        * validateId(5)
-        * //=OK
-        * validateId(null)
-        * //=Error
-        * validateId(undefined)
-        * //=Error
-        */
-       function validateId(id) {
-           if (!id) {
-               throw new Error("id is required");
-           }
-           if (["string", "number"].indexOf(typeof id) === -1) {
-               throw new Error("id must be a number or a string");
-           }
-       }
-       exports.validateId = validateId;
-       // Deprecated methods
-       function radians2degrees() {
-           throw new Error("method has been renamed to `radiansToDegrees`");
-       }
-       exports.radians2degrees = radians2degrees;
-       function degrees2radians() {
-           throw new Error("method has been renamed to `degreesToRadians`");
-       }
-       exports.degrees2radians = degrees2radians;
-       function distanceToDegrees() {
-           throw new Error("method has been renamed to `lengthToDegrees`");
-       }
-       exports.distanceToDegrees = distanceToDegrees;
-       function distanceToRadians() {
-           throw new Error("method has been renamed to `lengthToRadians`");
-       }
-       exports.distanceToRadians = distanceToRadians;
-       function radiansToDistance() {
-           throw new Error("method has been renamed to `radiansToLength`");
-       }
-       exports.radiansToDistance = radiansToDistance;
-       function bearingToAngle() {
-           throw new Error("method has been renamed to `bearingToAzimuth`");
-       }
-       exports.bearingToAngle = bearingToAngle;
-       function convertDistance() {
-           throw new Error("method has been renamed to `convertLength`");
+
+       function behaviorPaste(context) {
+         function doPaste(d3_event) {
+           // prevent paste during low zoom selection
+           if (!context.map().withinEditableZoom()) return;
+           d3_event.preventDefault();
+           var baseGraph = context.graph();
+           var mouse = context.map().mouse();
+           var projection = context.projection;
+           var viewport = geoExtent(projection.clipExtent()).polygon();
+           if (!geoPointInPolygon(mouse, viewport)) return;
+           var oldIDs = context.copyIDs();
+           if (!oldIDs.length) return;
+           var extent = geoExtent();
+           var oldGraph = context.copyGraph();
+           var newIDs = [];
+           var action = actionCopyEntities(oldIDs, oldGraph);
+           context.perform(action);
+           var copies = action.copies();
+           var originals = new Set();
+           Object.values(copies).forEach(function (entity) {
+             originals.add(entity.id);
+           });
+
+           for (var id in copies) {
+             var oldEntity = oldGraph.entity(id);
+             var newEntity = copies[id];
+
+             extent._extend(oldEntity.extent(oldGraph)); // Exclude child nodes from newIDs if their parent way was also copied.
+
+
+             var parents = context.graph().parentWays(newEntity);
+             var parentCopied = parents.some(function (parent) {
+               return originals.has(parent.id);
+             });
+
+             if (!parentCopied) {
+               newIDs.push(newEntity.id);
+             }
+           } // Put pasted objects where mouse pointer is..
+
+
+           var copyPoint = context.copyLonLat() && projection(context.copyLonLat()) || projection(extent.center());
+           var delta = geoVecSubtract(mouse, copyPoint);
+           context.perform(actionMove(newIDs, delta, projection));
+           context.enter(modeMove(context, newIDs, baseGraph));
+         }
+
+         function behavior() {
+           context.keybinding().on(uiCmd('⌘V'), doPaste);
+           return behavior;
+         }
+
+         behavior.off = function () {
+           context.keybinding().off(uiCmd('⌘V'));
+         };
+
+         return behavior;
        }
-       exports.convertDistance = convertDistance;
+
+       // `String.prototype.repeat` method
+       // https://tc39.github.io/ecma262/#sec-string.prototype.repeat
+       _export({ target: 'String', proto: true }, {
+         repeat: stringRepeat
        });
 
-       var invariant = createCommonjsModule(function (module, exports) {
-       Object.defineProperty(exports, "__esModule", { value: true });
+       /*
+           `behaviorDrag` is like `d3_behavior.drag`, with the following differences:
 
-       /**
-        * Unwrap a coordinate from a Point Feature, Geometry or a single coordinate.
-        *
-        * @name getCoord
-        * @param {Array<number>|Geometry<Point>|Feature<Point>} coord GeoJSON Point or an Array of numbers
-        * @returns {Array<number>} coordinates
-        * @example
-        * var pt = turf.point([10, 10]);
-        *
-        * var coord = turf.getCoord(pt);
-        * //= [10, 10]
+           * The `origin` function is expected to return an [x, y] tuple rather than an
+             {x, y} object.
+           * The events are `start`, `move`, and `end`.
+             (https://github.com/mbostock/d3/issues/563)
+           * The `start` event is not dispatched until the first cursor movement occurs.
+             (https://github.com/mbostock/d3/pull/368)
+           * The `move` event has a `point` and `delta` [x, y] tuple properties rather
+             than `x`, `y`, `dx`, and `dy` properties.
+           * The `end` event is not dispatched if no movement occurs.
+           * An `off` function is available that unbinds the drag's internal event handlers.
         */
-       function getCoord(coord) {
-           if (!coord) {
-               throw new Error("coord is required");
-           }
-           if (!Array.isArray(coord)) {
-               if (coord.type === "Feature" && coord.geometry !== null && coord.geometry.type === "Point") {
-                   return coord.geometry.coordinates;
-               }
-               if (coord.type === "Point") {
-                   return coord.coordinates;
-               }
-           }
-           if (Array.isArray(coord) && coord.length >= 2 && !Array.isArray(coord[0]) && !Array.isArray(coord[1])) {
-               return coord;
+
+       function behaviorDrag() {
+         var dispatch$1 = dispatch('start', 'move', 'end'); // see also behaviorSelect
+
+         var _tolerancePx = 1; // keep this low to facilitate pixel-perfect micromapping
+
+         var _penTolerancePx = 4; // styluses can be touchy so require greater movement - #1981
+
+         var _origin = null;
+         var _selector = '';
+
+         var _targetNode;
+
+         var _targetEntity;
+
+         var _surface;
+
+         var _pointerId; // use pointer events on supported platforms; fallback to mouse events
+
+
+         var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
+
+         var d3_event_userSelectProperty = utilPrefixCSSProperty('UserSelect');
+
+         var d3_event_userSelectSuppress = function d3_event_userSelectSuppress() {
+           var selection$1 = selection();
+           var select = selection$1.style(d3_event_userSelectProperty);
+           selection$1.style(d3_event_userSelectProperty, 'none');
+           return function () {
+             selection$1.style(d3_event_userSelectProperty, select);
+           };
+         };
+
+         function pointerdown(d3_event) {
+           if (_pointerId) return;
+           _pointerId = d3_event.pointerId || 'mouse';
+           _targetNode = this; // only force reflow once per drag
+
+           var pointerLocGetter = utilFastMouse(_surface || _targetNode.parentNode);
+           var offset;
+           var startOrigin = pointerLocGetter(d3_event);
+           var started = false;
+           var selectEnable = d3_event_userSelectSuppress();
+           select(window).on(_pointerPrefix + 'move.drag', pointermove).on(_pointerPrefix + 'up.drag pointercancel.drag', pointerup, true);
+
+           if (_origin) {
+             offset = _origin.call(_targetNode, _targetEntity);
+             offset = [offset[0] - startOrigin[0], offset[1] - startOrigin[1]];
+           } else {
+             offset = [0, 0];
            }
-           throw new Error("coord must be GeoJSON Point or an Array of numbers");
-       }
-       exports.getCoord = getCoord;
-       /**
-        * Unwrap coordinates from a Feature, Geometry Object or an Array
-        *
-        * @name getCoords
-        * @param {Array<any>|Geometry|Feature} coords Feature, Geometry Object or an Array
-        * @returns {Array<any>} coordinates
-        * @example
-        * var poly = turf.polygon([[[119.32, -8.7], [119.55, -8.69], [119.51, -8.54], [119.32, -8.7]]]);
-        *
-        * var coords = turf.getCoords(poly);
-        * //= [[[119.32, -8.7], [119.55, -8.69], [119.51, -8.54], [119.32, -8.7]]]
-        */
-       function getCoords(coords) {
-           if (Array.isArray(coords)) {
-               return coords;
+
+           d3_event.stopPropagation();
+
+           function pointermove(d3_event) {
+             if (_pointerId !== (d3_event.pointerId || 'mouse')) return;
+             var p = pointerLocGetter(d3_event);
+
+             if (!started) {
+               var dist = geoVecLength(startOrigin, p);
+               var tolerance = d3_event.pointerType === 'pen' ? _penTolerancePx : _tolerancePx; // don't start until the drag has actually moved somewhat
+
+               if (dist < tolerance) return;
+               started = true;
+               dispatch$1.call('start', this, d3_event, _targetEntity); // Don't send a `move` event in the same cycle as `start` since dragging
+               // a midpoint will convert the target to a node.
+             } else {
+               startOrigin = p;
+               d3_event.stopPropagation();
+               d3_event.preventDefault();
+               var dx = p[0] - startOrigin[0];
+               var dy = p[1] - startOrigin[1];
+               dispatch$1.call('move', this, d3_event, _targetEntity, [p[0] + offset[0], p[1] + offset[1]], [dx, dy]);
+             }
            }
-           // Feature
-           if (coords.type === "Feature") {
-               if (coords.geometry !== null) {
-                   return coords.geometry.coordinates;
-               }
+
+           function pointerup(d3_event) {
+             if (_pointerId !== (d3_event.pointerId || 'mouse')) return;
+             _pointerId = null;
+
+             if (started) {
+               dispatch$1.call('end', this, d3_event, _targetEntity);
+               d3_event.preventDefault();
+             }
+
+             select(window).on(_pointerPrefix + 'move.drag', null).on(_pointerPrefix + 'up.drag pointercancel.drag', null);
+             selectEnable();
            }
-           else {
-               // Geometry
-               if (coords.coordinates) {
-                   return coords.coordinates;
+         }
+
+         function behavior(selection) {
+           var matchesSelector = utilPrefixDOMProperty('matchesSelector');
+           var delegate = pointerdown;
+
+           if (_selector) {
+             delegate = function delegate(d3_event) {
+               var root = this;
+               var target = d3_event.target;
+
+               for (; target && target !== root; target = target.parentNode) {
+                 var datum = target.__data__;
+                 _targetEntity = datum instanceof osmNote ? datum : datum && datum.properties && datum.properties.entity;
+
+                 if (_targetEntity && target[matchesSelector](_selector)) {
+                   return pointerdown.call(target, d3_event);
+                 }
                }
+             };
            }
-           throw new Error("coords must be GeoJSON Feature, Geometry Object or an Array");
-       }
-       exports.getCoords = getCoords;
-       /**
-        * Checks if coordinates contains a number
-        *
-        * @name containsNumber
-        * @param {Array<any>} coordinates GeoJSON Coordinates
-        * @returns {boolean} true if Array contains a number
-        */
-       function containsNumber(coordinates) {
-           if (coordinates.length > 1 && helpers$1.isNumber(coordinates[0]) && helpers$1.isNumber(coordinates[1])) {
-               return true;
-           }
-           if (Array.isArray(coordinates[0]) && coordinates[0].length) {
-               return containsNumber(coordinates[0]);
-           }
-           throw new Error("coordinates must only contain numbers");
-       }
-       exports.containsNumber = containsNumber;
-       /**
-        * Enforce expectations about types of GeoJSON objects for Turf.
-        *
-        * @name geojsonType
-        * @param {GeoJSON} value any GeoJSON object
-        * @param {string} type expected GeoJSON type
-        * @param {string} name name of calling function
-        * @throws {Error} if value is not the expected type.
-        */
-       function geojsonType(value, type, name) {
-           if (!type || !name) {
-               throw new Error("type and name required");
-           }
-           if (!value || value.type !== type) {
-               throw new Error("Invalid input to " + name + ": must be a " + type + ", given " + value.type);
-           }
+
+           selection.on(_pointerPrefix + 'down.drag' + _selector, delegate);
+         }
+
+         behavior.off = function (selection) {
+           selection.on(_pointerPrefix + 'down.drag' + _selector, null);
+         };
+
+         behavior.selector = function (_) {
+           if (!arguments.length) return _selector;
+           _selector = _;
+           return behavior;
+         };
+
+         behavior.origin = function (_) {
+           if (!arguments.length) return _origin;
+           _origin = _;
+           return behavior;
+         };
+
+         behavior.cancel = function () {
+           select(window).on(_pointerPrefix + 'move.drag', null).on(_pointerPrefix + 'up.drag pointercancel.drag', null);
+           return behavior;
+         };
+
+         behavior.targetNode = function (_) {
+           if (!arguments.length) return _targetNode;
+           _targetNode = _;
+           return behavior;
+         };
+
+         behavior.targetEntity = function (_) {
+           if (!arguments.length) return _targetEntity;
+           _targetEntity = _;
+           return behavior;
+         };
+
+         behavior.surface = function (_) {
+           if (!arguments.length) return _surface;
+           _surface = _;
+           return behavior;
+         };
+
+         return utilRebind(behavior, dispatch$1, 'on');
        }
-       exports.geojsonType = geojsonType;
-       /**
-        * Enforce expectations about types of {@link Feature} inputs for Turf.
-        * Internally this uses {@link geojsonType} to judge geometry types.
-        *
-        * @name featureOf
-        * @param {Feature} feature a feature with an expected geometry type
-        * @param {string} type expected GeoJSON type
-        * @param {string} name name of calling function
-        * @throws {Error} error if value is not the expected type.
-        */
-       function featureOf(feature, type, name) {
-           if (!feature) {
-               throw new Error("No feature passed");
-           }
-           if (!name) {
-               throw new Error(".featureOf() requires a name");
+
+       function modeDragNode(context) {
+         var mode = {
+           id: 'drag-node',
+           button: 'browse'
+         };
+         var hover = behaviorHover(context).altDisables(true).on('hover', context.ui().sidebar.hover);
+         var edit = behaviorEdit(context);
+
+         var _nudgeInterval;
+
+         var _restoreSelectedIDs = [];
+         var _wasMidpoint = false;
+         var _isCancelled = false;
+
+         var _activeEntity;
+
+         var _startLoc;
+
+         var _lastLoc;
+
+         function startNudge(d3_event, entity, nudge) {
+           if (_nudgeInterval) window.clearInterval(_nudgeInterval);
+           _nudgeInterval = window.setInterval(function () {
+             context.map().pan(nudge);
+             doMove(d3_event, entity, nudge);
+           }, 50);
+         }
+
+         function stopNudge() {
+           if (_nudgeInterval) {
+             window.clearInterval(_nudgeInterval);
+             _nudgeInterval = null;
            }
-           if (!feature || feature.type !== "Feature" || !feature.geometry) {
-               throw new Error("Invalid input to " + name + ", Feature with geometry required");
+         }
+
+         function moveAnnotation(entity) {
+           return _t('operations.move.annotation.' + entity.geometry(context.graph()));
+         }
+
+         function connectAnnotation(nodeEntity, targetEntity) {
+           var nodeGeometry = nodeEntity.geometry(context.graph());
+           var targetGeometry = targetEntity.geometry(context.graph());
+
+           if (nodeGeometry === 'vertex' && targetGeometry === 'vertex') {
+             var nodeParentWayIDs = context.graph().parentWays(nodeEntity);
+             var targetParentWayIDs = context.graph().parentWays(targetEntity);
+             var sharedParentWays = utilArrayIntersection(nodeParentWayIDs, targetParentWayIDs); // if both vertices are part of the same way
+
+             if (sharedParentWays.length !== 0) {
+               // if the nodes are next to each other, they are merged
+               if (sharedParentWays[0].areAdjacent(nodeEntity.id, targetEntity.id)) {
+                 return _t('operations.connect.annotation.from_vertex.to_adjacent_vertex');
+               }
+
+               return _t('operations.connect.annotation.from_vertex.to_sibling_vertex');
+             }
            }
-           if (!feature.geometry || feature.geometry.type !== type) {
-               throw new Error("Invalid input to " + name + ": must be a " + type + ", given " + feature.geometry.type);
+
+           return _t('operations.connect.annotation.from_' + nodeGeometry + '.to_' + targetGeometry);
+         }
+
+         function shouldSnapToNode(target) {
+           if (!_activeEntity) return false;
+           return _activeEntity.geometry(context.graph()) !== 'vertex' || target.geometry(context.graph()) === 'vertex' || _mainPresetIndex.allowsVertex(target, context.graph());
+         }
+
+         function origin(entity) {
+           return context.projection(entity.loc);
+         }
+
+         function keydown(d3_event) {
+           if (d3_event.keyCode === utilKeybinding.modifierCodes.alt) {
+             if (context.surface().classed('nope')) {
+               context.surface().classed('nope-suppressed', true);
+             }
+
+             context.surface().classed('nope', false).classed('nope-disabled', true);
            }
-       }
-       exports.featureOf = featureOf;
-       /**
-        * Enforce expectations about types of {@link FeatureCollection} inputs for Turf.
-        * Internally this uses {@link geojsonType} to judge geometry types.
-        *
-        * @name collectionOf
-        * @param {FeatureCollection} featureCollection a FeatureCollection for which features will be judged
-        * @param {string} type expected GeoJSON type
-        * @param {string} name name of calling function
-        * @throws {Error} if value is not the expected type.
-        */
-       function collectionOf(featureCollection, type, name) {
-           if (!featureCollection) {
-               throw new Error("No featureCollection passed");
+         }
+
+         function keyup(d3_event) {
+           if (d3_event.keyCode === utilKeybinding.modifierCodes.alt) {
+             if (context.surface().classed('nope-suppressed')) {
+               context.surface().classed('nope', true);
+             }
+
+             context.surface().classed('nope-suppressed', false).classed('nope-disabled', false);
            }
-           if (!name) {
-               throw new Error(".collectionOf() requires a name");
+         }
+
+         function start(d3_event, entity) {
+           _wasMidpoint = entity.type === 'midpoint';
+           var hasHidden = context.features().hasHiddenConnections(entity, context.graph());
+           _isCancelled = !context.editable() || d3_event.shiftKey || hasHidden;
+
+           if (_isCancelled) {
+             if (hasHidden) {
+               context.ui().flash.duration(4000).iconName('#iD-icon-no').label(_t('modes.drag_node.connected_to_hidden'))();
+             }
+
+             return drag.cancel();
            }
-           if (!featureCollection || featureCollection.type !== "FeatureCollection") {
-               throw new Error("Invalid input to " + name + ", FeatureCollection required");
+
+           if (_wasMidpoint) {
+             var midpoint = entity;
+             entity = osmNode();
+             context.perform(actionAddMidpoint(midpoint, entity));
+             entity = context.entity(entity.id); // get post-action entity
+
+             var vertex = context.surface().selectAll('.' + entity.id);
+             drag.targetNode(vertex.node()).targetEntity(entity);
+           } else {
+             context.perform(actionNoop());
            }
-           for (var _i = 0, _a = featureCollection.features; _i < _a.length; _i++) {
-               var feature = _a[_i];
-               if (!feature || feature.type !== "Feature" || !feature.geometry) {
-                   throw new Error("Invalid input to " + name + ", Feature with geometry required");
-               }
-               if (!feature.geometry || feature.geometry.type !== type) {
-                   throw new Error("Invalid input to " + name + ": must be a " + type + ", given " + feature.geometry.type);
+
+           _activeEntity = entity;
+           _startLoc = entity.loc;
+           hover.ignoreVertex(entity.geometry(context.graph()) === 'vertex');
+           context.surface().selectAll('.' + _activeEntity.id).classed('active', true);
+           context.enter(mode);
+         } // related code
+         // - `behavior/draw.js` `datum()`
+
+
+         function datum(d3_event) {
+           if (!d3_event || d3_event.altKey) {
+             return {};
+           } else {
+             // When dragging, snap only to touch targets..
+             // (this excludes area fills and active drawing elements)
+             var d = d3_event.target.__data__;
+             return d && d.properties && d.properties.target ? d : {};
+           }
+         }
+
+         function doMove(d3_event, entity, nudge) {
+           nudge = nudge || [0, 0];
+           var currPoint = d3_event && d3_event.point || context.projection(_lastLoc);
+           var currMouse = geoVecSubtract(currPoint, nudge);
+           var loc = context.projection.invert(currMouse);
+           var target, edge;
+
+           if (!_nudgeInterval) {
+             // If not nudging at the edge of the viewport, try to snap..
+             // related code
+             // - `mode/drag_node.js`     `doMove()`
+             // - `behavior/draw.js`      `click()`
+             // - `behavior/draw_way.js`  `move()`
+             var d = datum(d3_event);
+             target = d && d.properties && d.properties.entity;
+             var targetLoc = target && target.loc;
+             var targetNodes = d && d.properties && d.properties.nodes;
+
+             if (targetLoc) {
+               // snap to node/vertex - a point target with `.loc`
+               if (shouldSnapToNode(target)) {
+                 loc = targetLoc;
+               }
+             } else if (targetNodes) {
+               // snap to way - a line target with `.nodes`
+               edge = geoChooseEdge(targetNodes, context.map().mouse(), context.projection, end.id);
+
+               if (edge) {
+                 loc = edge.loc;
                }
+             }
            }
-       }
-       exports.collectionOf = collectionOf;
-       /**
-        * Get Geometry from Feature or Geometry Object
-        *
-        * @param {Feature|Geometry} geojson GeoJSON Feature or Geometry Object
-        * @returns {Geometry|null} GeoJSON Geometry Object
-        * @throws {Error} if geojson is not a Feature or Geometry Object
-        * @example
-        * var point = {
-        *   "type": "Feature",
-        *   "properties": {},
-        *   "geometry": {
-        *     "type": "Point",
-        *     "coordinates": [110, 40]
-        *   }
-        * }
-        * var geom = turf.getGeom(point)
-        * //={"type": "Point", "coordinates": [110, 40]}
-        */
-       function getGeom(geojson) {
-           if (geojson.type === "Feature") {
-               return geojson.geometry;
-           }
-           return geojson;
-       }
-       exports.getGeom = getGeom;
-       /**
-        * Get GeoJSON object's type, Geometry type is prioritize.
-        *
-        * @param {GeoJSON} geojson GeoJSON object
-        * @param {string} [name="geojson"] name of the variable to display in error message
-        * @returns {string} GeoJSON type
-        * @example
-        * var point = {
-        *   "type": "Feature",
-        *   "properties": {},
-        *   "geometry": {
-        *     "type": "Point",
-        *     "coordinates": [110, 40]
-        *   }
-        * }
-        * var geom = turf.getType(point)
-        * //="Point"
-        */
-       function getType(geojson, name) {
-           if (geojson.type === "FeatureCollection") {
-               return "FeatureCollection";
-           }
-           if (geojson.type === "GeometryCollection") {
-               return "GeometryCollection";
+
+           context.replace(actionMoveNode(entity.id, loc)); // Below here: validations
+
+           var isInvalid = false; // Check if this connection to `target` could cause relations to break..
+
+           if (target) {
+             isInvalid = hasRelationConflict(entity, target, edge, context.graph());
+           } // Check if this drag causes the geometry to break..
+
+
+           if (!isInvalid) {
+             isInvalid = hasInvalidGeometry(entity, context.graph());
            }
-           if (geojson.type === "Feature" && geojson.geometry !== null) {
-               return geojson.geometry.type;
+
+           var nope = context.surface().classed('nope');
+
+           if (isInvalid === 'relation' || isInvalid === 'restriction') {
+             if (!nope) {
+               // about to nope - show hint
+               context.ui().flash.duration(4000).iconName('#iD-icon-no').label(_t('operations.connect.' + isInvalid, {
+                 relation: _mainPresetIndex.item('type/restriction').name()
+               }))();
+             }
+           } else if (isInvalid) {
+             var errorID = isInvalid === 'line' ? 'lines' : 'areas';
+             context.ui().flash.duration(3000).iconName('#iD-icon-no').label(_t('self_intersection.error.' + errorID))();
+           } else {
+             if (nope) {
+               // about to un-nope, remove hint
+               context.ui().flash.duration(1).label('')();
+             }
            }
-           return geojson.type;
-       }
-       exports.getType = getType;
-       });
 
-       var lineclip_1 = lineclip;
-       var _default = lineclip;
+           var nopeDisabled = context.surface().classed('nope-disabled');
 
-       lineclip.polyline = lineclip;
-       lineclip.polygon = polygonclip;
+           if (nopeDisabled) {
+             context.surface().classed('nope', false).classed('nope-suppressed', isInvalid);
+           } else {
+             context.surface().classed('nope', isInvalid).classed('nope-suppressed', false);
+           }
 
+           _lastLoc = loc;
+         } // Uses `actionConnect.disabled()` to know whether this connection is ok..
 
-       // Cohen-Sutherland line clippign algorithm, adapted to efficiently
-       // handle polylines rather than just segments
 
-       function lineclip(points, bbox, result) {
+         function hasRelationConflict(entity, target, edge, graph) {
+           var testGraph = graph.update(); // copy
+           // if snapping to way - add midpoint there and consider that the target..
 
-           var len = points.length,
-               codeA = bitCode(points[0], bbox),
-               part = [],
-               i, a, b, codeB, lastCode;
+           if (edge) {
+             var midpoint = osmNode();
+             var action = actionAddMidpoint({
+               loc: edge.loc,
+               edge: [target.nodes[edge.index - 1], target.nodes[edge.index]]
+             }, midpoint);
+             testGraph = action(testGraph);
+             target = midpoint;
+           } // can we connect to it?
 
-           if (!result) result = [];
 
-           for (i = 1; i < len; i++) {
-               a = points[i - 1];
-               b = points[i];
-               codeB = lastCode = bitCode(b, bbox);
+           var ids = [entity.id, target.id];
+           return actionConnect(ids).disabled(testGraph);
+         }
 
-               while (true) {
+         function hasInvalidGeometry(entity, graph) {
+           var parents = graph.parentWays(entity);
+           var i, j, k;
 
-                   if (!(codeA | codeB)) { // accept
-                       part.push(a);
+           for (i = 0; i < parents.length; i++) {
+             var parent = parents[i];
+             var nodes = [];
+             var activeIndex = null; // which multipolygon ring contains node being dragged
+             // test any parent multipolygons for valid geometry
 
-                       if (codeB !== lastCode) { // segment went outside
-                           part.push(b);
+             var relations = graph.parentRelations(parent);
 
-                           if (i < len - 1) { // start a new line
-                               result.push(part);
-                               part = [];
-                           }
-                       } else if (i === len - 1) {
-                           part.push(b);
-                       }
-                       break;
+             for (j = 0; j < relations.length; j++) {
+               if (!relations[j].isMultipolygon()) continue;
+               var rings = osmJoinWays(relations[j].members, graph); // find active ring and test it for self intersections
 
-                   } else if (codeA & codeB) { // trivial reject
-                       break;
+               for (k = 0; k < rings.length; k++) {
+                 nodes = rings[k].nodes;
 
-                   } else if (codeA) { // a outside, intersect with clip edge
-                       a = intersect(a, b, codeA, bbox);
-                       codeA = bitCode(a, bbox);
+                 if (nodes.find(function (n) {
+                   return n.id === entity.id;
+                 })) {
+                   activeIndex = k;
 
-                   } else { // b outside
-                       b = intersect(a, b, codeB, bbox);
-                       codeB = bitCode(b, bbox);
+                   if (geoHasSelfIntersections(nodes, entity.id)) {
+                     return 'multipolygonMember';
                    }
+                 }
+
+                 rings[k].coords = nodes.map(function (n) {
+                   return n.loc;
+                 });
+               } // test active ring for intersections with other rings in the multipolygon
+
+
+               for (k = 0; k < rings.length; k++) {
+                 if (k === activeIndex) continue; // make sure active ring doesn't cross passive rings
+
+                 if (geoHasLineIntersections(rings[activeIndex].nodes, rings[k].nodes, entity.id)) {
+                   return 'multipolygonRing';
+                 }
+               }
+             } // If we still haven't tested this node's parent way for self-intersections.
+             // (because it's not a member of a multipolygon), test it now.
+
+
+             if (activeIndex === null) {
+               nodes = parent.nodes.map(function (nodeID) {
+                 return graph.entity(nodeID);
+               });
+
+               if (nodes.length && geoHasSelfIntersections(nodes, entity.id)) {
+                 return parent.geometry(graph);
                }
+             }
+           }
+
+           return false;
+         }
+
+         function move(d3_event, entity, point) {
+           if (_isCancelled) return;
+           d3_event.stopPropagation();
+           context.surface().classed('nope-disabled', d3_event.altKey);
+           _lastLoc = context.projection.invert(point);
+           doMove(d3_event, entity);
+           var nudge = geoViewportEdge(point, context.map().dimensions());
 
-               codeA = lastCode;
+           if (nudge) {
+             startNudge(d3_event, entity, nudge);
+           } else {
+             stopNudge();
+           }
+         }
+
+         function end(d3_event, entity) {
+           if (_isCancelled) return;
+           var wasPoint = entity.geometry(context.graph()) === 'point';
+           var d = datum(d3_event);
+           var nope = d && d.properties && d.properties.nope || context.surface().classed('nope');
+           var target = d && d.properties && d.properties.entity; // entity to snap to
+
+           if (nope) {
+             // bounce back
+             context.perform(_actionBounceBack(entity.id, _startLoc));
+           } else if (target && target.type === 'way') {
+             var choice = geoChooseEdge(context.graph().childNodes(target), context.map().mouse(), context.projection, entity.id);
+             context.replace(actionAddMidpoint({
+               loc: choice.loc,
+               edge: [target.nodes[choice.index - 1], target.nodes[choice.index]]
+             }, entity), connectAnnotation(entity, target));
+           } else if (target && target.type === 'node' && shouldSnapToNode(target)) {
+             context.replace(actionConnect([target.id, entity.id]), connectAnnotation(entity, target));
+           } else if (_wasMidpoint) {
+             context.replace(actionNoop(), _t('operations.add.annotation.vertex'));
+           } else {
+             context.replace(actionNoop(), moveAnnotation(entity));
            }
 
-           if (part.length) result.push(part);
+           if (wasPoint) {
+             context.enter(modeSelect(context, [entity.id]));
+           } else {
+             var reselection = _restoreSelectedIDs.filter(function (id) {
+               return context.graph().hasEntity(id);
+             });
 
-           return result;
-       }
+             if (reselection.length) {
+               context.enter(modeSelect(context, reselection));
+             } else {
+               context.enter(modeBrowse(context));
+             }
+           }
+         }
 
-       // Sutherland-Hodgeman polygon clipping algorithm
+         function _actionBounceBack(nodeID, toLoc) {
+           var moveNode = actionMoveNode(nodeID, toLoc);
 
-       function polygonclip(points, bbox) {
+           var action = function action(graph, t) {
+             // last time through, pop off the bounceback perform.
+             // it will then overwrite the initial perform with a moveNode that does nothing
+             if (t === 1) context.pop();
+             return moveNode(graph, t);
+           };
 
-           var result, edge, prev, prevInside, i, p, inside;
+           action.transitionable = true;
+           return action;
+         }
 
-           // clip against each side of the clip rectangle
-           for (edge = 1; edge <= 8; edge *= 2) {
-               result = [];
-               prev = points[points.length - 1];
-               prevInside = !(bitCode(prev, bbox) & edge);
+         function cancel() {
+           drag.cancel();
+           context.enter(modeBrowse(context));
+         }
 
-               for (i = 0; i < points.length; i++) {
-                   p = points[i];
-                   inside = !(bitCode(p, bbox) & edge);
+         var drag = behaviorDrag().selector('.layer-touch.points .target').surface(context.container().select('.main-map').node()).origin(origin).on('start', start).on('move', move).on('end', end);
 
-                   // if segment goes through the clip window, add an intersection
-                   if (inside !== prevInside) result.push(intersect(prev, p, edge, bbox));
+         mode.enter = function () {
+           context.install(hover);
+           context.install(edit);
+           select(window).on('keydown.dragNode', keydown).on('keyup.dragNode', keyup);
+           context.history().on('undone.drag-node', cancel);
+         };
 
-                   if (inside) result.push(p); // add a point if it's inside
+         mode.exit = function () {
+           context.ui().sidebar.hover.cancel();
+           context.uninstall(hover);
+           context.uninstall(edit);
+           select(window).on('keydown.dragNode', null).on('keyup.dragNode', null);
+           context.history().on('undone.drag-node', null);
+           _activeEntity = null;
+           context.surface().classed('nope', false).classed('nope-suppressed', false).classed('nope-disabled', false).selectAll('.active').classed('active', false);
+           stopNudge();
+         };
 
-                   prev = p;
-                   prevInside = inside;
-               }
+         mode.selectedIDs = function () {
+           if (!arguments.length) return _activeEntity ? [_activeEntity.id] : []; // no assign
 
-               points = result;
+           return mode;
+         };
 
-               if (!points.length) break;
-           }
+         mode.activeID = function () {
+           if (!arguments.length) return _activeEntity && _activeEntity.id; // no assign
 
-           return result;
-       }
+           return mode;
+         };
 
-       // intersect a segment against one of the 4 lines that make up the bbox
+         mode.restoreSelectedIDs = function (_) {
+           if (!arguments.length) return _restoreSelectedIDs;
+           _restoreSelectedIDs = _;
+           return mode;
+         };
 
-       function intersect(a, b, edge, bbox) {
-           return edge & 8 ? [a[0] + (b[0] - a[0]) * (bbox[3] - a[1]) / (b[1] - a[1]), bbox[3]] : // top
-                  edge & 4 ? [a[0] + (b[0] - a[0]) * (bbox[1] - a[1]) / (b[1] - a[1]), bbox[1]] : // bottom
-                  edge & 2 ? [bbox[2], a[1] + (b[1] - a[1]) * (bbox[2] - a[0]) / (b[0] - a[0])] : // right
-                  edge & 1 ? [bbox[0], a[1] + (b[1] - a[1]) * (bbox[0] - a[0]) / (b[0] - a[0])] : // left
-                  null;
+         mode.behavior = drag;
+         return mode;
        }
 
-       // bit code reflects the point position relative to the bbox:
-
-       //         left  mid  right
-       //    top  1001  1000  1010
-       //    mid  0001  0000  0010
-       // bottom  0101  0100  0110
+       // Safari bug https://bugs.webkit.org/show_bug.cgi?id=200829
+       var NON_GENERIC = !!nativePromiseConstructor && fails(function () {
+         nativePromiseConstructor.prototype['finally'].call({ then: function () { /* empty */ } }, function () { /* empty */ });
+       });
 
-       function bitCode(p, bbox) {
-           var code = 0;
+       // `Promise.prototype.finally` method
+       // https://tc39.github.io/ecma262/#sec-promise.prototype.finally
+       _export({ target: 'Promise', proto: true, real: true, forced: NON_GENERIC }, {
+         'finally': function (onFinally) {
+           var C = speciesConstructor(this, getBuiltIn('Promise'));
+           var isFunction = typeof onFinally == 'function';
+           return this.then(
+             isFunction ? function (x) {
+               return promiseResolve(C, onFinally()).then(function () { return x; });
+             } : onFinally,
+             isFunction ? function (e) {
+               return promiseResolve(C, onFinally()).then(function () { throw e; });
+             } : onFinally
+           );
+         }
+       });
 
-           if (p[0] < bbox[0]) code |= 1; // left
-           else if (p[0] > bbox[2]) code |= 2; // right
+       // patch native Promise.prototype for native async functions
+       if ( typeof nativePromiseConstructor == 'function' && !nativePromiseConstructor.prototype['finally']) {
+         redefine(nativePromiseConstructor.prototype, 'finally', getBuiltIn('Promise').prototype['finally']);
+       }
 
-           if (p[1] < bbox[1]) code |= 4; // bottom
-           else if (p[1] > bbox[3]) code |= 8; // top
+       // @@search logic
+       fixRegexpWellKnownSymbolLogic('search', 1, function (SEARCH, nativeSearch, maybeCallNative) {
+         return [
+           // `String.prototype.search` method
+           // https://tc39.github.io/ecma262/#sec-string.prototype.search
+           function search(regexp) {
+             var O = requireObjectCoercible(this);
+             var searcher = regexp == undefined ? undefined : regexp[SEARCH];
+             return searcher !== undefined ? searcher.call(regexp, O) : new RegExp(regexp)[SEARCH](String(O));
+           },
+           // `RegExp.prototype[@@search]` method
+           // https://tc39.github.io/ecma262/#sec-regexp.prototype-@@search
+           function (regexp) {
+             var res = maybeCallNative(nativeSearch, regexp, this);
+             if (res.done) return res.value;
+
+             var rx = anObject(regexp);
+             var S = String(this);
+
+             var previousLastIndex = rx.lastIndex;
+             if (!sameValue(previousLastIndex, 0)) rx.lastIndex = 0;
+             var result = regexpExecAbstract(rx, S);
+             if (!sameValue(rx.lastIndex, previousLastIndex)) rx.lastIndex = previousLastIndex;
+             return result === null ? -1 : result.index;
+           }
+         ];
+       });
 
-           return code;
+       function quickselect$1(arr, k, left, right, compare) {
+         quickselectStep(arr, k, left || 0, right || arr.length - 1, compare || defaultCompare);
        }
-       lineclip_1.default = _default;
 
-       var bboxClip_1 = createCommonjsModule(function (module, exports) {
-       var __importStar = (commonjsGlobal && commonjsGlobal.__importStar) || function (mod) {
-           if (mod && mod.__esModule) return mod;
-           var result = {};
-           if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
-           result["default"] = mod;
-           return result;
-       };
-       Object.defineProperty(exports, "__esModule", { value: true });
+       function quickselectStep(arr, k, left, right, compare) {
+         while (right > left) {
+           if (right - left > 600) {
+             var n = right - left + 1;
+             var m = k - left + 1;
+             var z = Math.log(n);
+             var s = 0.5 * Math.exp(2 * z / 3);
+             var sd = 0.5 * Math.sqrt(z * s * (n - s) / n) * (m - n / 2 < 0 ? -1 : 1);
+             var newLeft = Math.max(left, Math.floor(k - m * s / n + sd));
+             var newRight = Math.min(right, Math.floor(k + (n - m) * s / n + sd));
+             quickselectStep(arr, k, newLeft, newRight, compare);
+           }
+
+           var t = arr[k];
+           var i = left;
+           var j = right;
+           swap$1(arr, left, k);
+           if (compare(arr[right], t) > 0) swap$1(arr, left, right);
+
+           while (i < j) {
+             swap$1(arr, i, j);
+             i++;
+             j--;
 
+             while (compare(arr[i], t) < 0) {
+               i++;
+             }
 
-       var lineclip = __importStar(lineclip_1);
-       /**
-        * Takes a {@link Feature} and a bbox and clips the feature to the bbox using
-        * [lineclip](https://github.com/mapbox/lineclip).
-        * May result in degenerate edges when clipping Polygons.
-        *
-        * @name bboxClip
-        * @param {Feature<LineString|MultiLineString|Polygon|MultiPolygon>} feature feature to clip to the bbox
-        * @param {BBox} bbox extent in [minX, minY, maxX, maxY] order
-        * @returns {Feature<LineString|MultiLineString|Polygon|MultiPolygon>} clipped Feature
-        * @example
-        * var bbox = [0, 0, 10, 10];
-        * var poly = turf.polygon([[[2, 2], [8, 4], [12, 8], [3, 7], [2, 2]]]);
-        *
-        * var clipped = turf.bboxClip(poly, bbox);
-        *
-        * //addToMap
-        * var addToMap = [bbox, poly, clipped]
-        */
-       function bboxClip(feature, bbox) {
-           var geom = invariant.getGeom(feature);
-           var type = geom.type;
-           var properties = feature.type === "Feature" ? feature.properties : {};
-           var coords = geom.coordinates;
-           switch (type) {
-               case "LineString":
-               case "MultiLineString":
-                   var lines_1 = [];
-                   if (type === "LineString") {
-                       coords = [coords];
-                   }
-                   coords.forEach(function (line) {
-                       lineclip.polyline(line, bbox, lines_1);
-                   });
-                   if (lines_1.length === 1) {
-                       return helpers$1.lineString(lines_1[0], properties);
-                   }
-                   return helpers$1.multiLineString(lines_1, properties);
-               case "Polygon":
-                   return helpers$1.polygon(clipPolygon(coords, bbox), properties);
-               case "MultiPolygon":
-                   return helpers$1.multiPolygon(coords.map(function (poly) {
-                       return clipPolygon(poly, bbox);
-                   }), properties);
-               default:
-                   throw new Error("geometry " + type + " not supported");
+             while (compare(arr[j], t) > 0) {
+               j--;
+             }
            }
-       }
-       exports.default = bboxClip;
-       function clipPolygon(rings, bbox) {
-           var outRings = [];
-           for (var _i = 0, rings_1 = rings; _i < rings_1.length; _i++) {
-               var ring = rings_1[_i];
-               var clipped = lineclip.polygon(ring, bbox);
-               if (clipped.length > 0) {
-                   if (clipped[0][0] !== clipped[clipped.length - 1][0] || clipped[0][1] !== clipped[clipped.length - 1][1]) {
-                       clipped.push(clipped[0]);
-                   }
-                   if (clipped.length >= 4) {
-                       outRings.push(clipped);
-                   }
-               }
+
+           if (compare(arr[left], t) === 0) swap$1(arr, left, j);else {
+             j++;
+             swap$1(arr, j, right);
            }
-           return outRings;
+           if (j <= k) left = j + 1;
+           if (k <= j) right = j - 1;
+         }
        }
-       });
 
-       var fastJsonStableStringify = function (data, opts) {
-           if (!opts) opts = {};
-           if (typeof opts === 'function') opts = { cmp: opts };
-           var cycles = (typeof opts.cycles === 'boolean') ? opts.cycles : false;
-
-           var cmp = opts.cmp && (function (f) {
-               return function (node) {
-                   return function (a, b) {
-                       var aobj = { key: a, value: node[a] };
-                       var bobj = { key: b, value: node[b] };
-                       return f(aobj, bobj);
-                   };
-               };
-           })(opts.cmp);
+       function swap$1(arr, i, j) {
+         var tmp = arr[i];
+         arr[i] = arr[j];
+         arr[j] = tmp;
+       }
 
-           var seen = [];
-           return (function stringify (node) {
-               if (node && node.toJSON && typeof node.toJSON === 'function') {
-                   node = node.toJSON();
-               }
+       function defaultCompare(a, b) {
+         return a < b ? -1 : a > b ? 1 : 0;
+       }
 
-               if (node === undefined) return;
-               if (typeof node == 'number') return isFinite(node) ? '' + node : 'null';
-               if (typeof node !== 'object') return JSON.stringify(node);
+       var RBush = /*#__PURE__*/function () {
+         function RBush() {
+           var maxEntries = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 9;
 
-               var i, out;
-               if (Array.isArray(node)) {
-                   out = '[';
-                   for (i = 0; i < node.length; i++) {
-                       if (i) out += ',';
-                       out += stringify(node[i]) || 'null';
-                   }
-                   return out + ']';
-               }
+           _classCallCheck(this, RBush);
 
-               if (node === null) return 'null';
+           // max entries in a node is 9 by default; min node fill is 40% for best performance
+           this._maxEntries = Math.max(4, maxEntries);
+           this._minEntries = Math.max(2, Math.ceil(this._maxEntries * 0.4));
+           this.clear();
+         }
 
-               if (seen.indexOf(node) !== -1) {
-                   if (cycles) return JSON.stringify('__cycle__');
-                   throw new TypeError('Converting circular structure to JSON');
+         _createClass(RBush, [{
+           key: "all",
+           value: function all() {
+             return this._all(this.data, []);
+           }
+         }, {
+           key: "search",
+           value: function search(bbox) {
+             var node = this.data;
+             var result = [];
+             if (!intersects(bbox, node)) return result;
+             var toBBox = this.toBBox;
+             var nodesToSearch = [];
+
+             while (node) {
+               for (var i = 0; i < node.children.length; i++) {
+                 var child = node.children[i];
+                 var childBBox = node.leaf ? toBBox(child) : child;
+
+                 if (intersects(bbox, childBBox)) {
+                   if (node.leaf) result.push(child);else if (contains(bbox, childBBox)) this._all(child, result);else nodesToSearch.push(child);
+                 }
                }
 
-               var seenIndex = seen.push(node) - 1;
-               var keys = Object.keys(node).sort(cmp && cmp(node));
-               out = '';
-               for (i = 0; i < keys.length; i++) {
-                   var key = keys[i];
-                   var value = stringify(node[key]);
+               node = nodesToSearch.pop();
+             }
 
-                   if (!value) continue;
-                   if (out) out += ',';
-                   out += JSON.stringify(key) + ':' + value;
+             return result;
+           }
+         }, {
+           key: "collides",
+           value: function collides(bbox) {
+             var node = this.data;
+             if (!intersects(bbox, node)) return false;
+             var nodesToSearch = [];
+
+             while (node) {
+               for (var i = 0; i < node.children.length; i++) {
+                 var child = node.children[i];
+                 var childBBox = node.leaf ? this.toBBox(child) : child;
+
+                 if (intersects(bbox, childBBox)) {
+                   if (node.leaf || contains(bbox, childBBox)) return true;
+                   nodesToSearch.push(child);
+                 }
                }
-               seen.splice(seenIndex, 1);
-               return '{' + out + '}';
-           })(data);
-       };
 
-       function DEFAULT_COMPARE (a, b) { return a > b ? 1 : a < b ? -1 : 0; }
+               node = nodesToSearch.pop();
+             }
 
-       class SplayTree {
+             return false;
+           }
+         }, {
+           key: "load",
+           value: function load(data) {
+             if (!(data && data.length)) return this;
 
-         constructor(compare = DEFAULT_COMPARE, noDuplicates = false) {
-           this._compare = compare;
-           this._root = null;
-           this._size = 0;
-           this._noDuplicates = !!noDuplicates;
-         }
+             if (data.length < this._minEntries) {
+               for (var i = 0; i < data.length; i++) {
+                 this.insert(data[i]);
+               }
 
+               return this;
+             } // recursively build the tree with the given data from scratch using OMT algorithm
 
-         rotateLeft(x) {
-           var y = x.right;
-           if (y) {
-             x.right = y.left;
-             if (y.left) y.left.parent = x;
-             y.parent = x.parent;
-           }
 
-           if (!x.parent)                this._root = y;
-           else if (x === x.parent.left) x.parent.left = y;
-           else                          x.parent.right = y;
-           if (y) y.left = x;
-           x.parent = y;
-         }
+             var node = this._build(data.slice(), 0, data.length - 1, 0);
 
+             if (!this.data.children.length) {
+               // save as is if tree is empty
+               this.data = node;
+             } else if (this.data.height === node.height) {
+               // split root if trees have the same height
+               this._splitRoot(this.data, node);
+             } else {
+               if (this.data.height < node.height) {
+                 // swap trees if inserted one is bigger
+                 var tmpNode = this.data;
+                 this.data = node;
+                 node = tmpNode;
+               } // insert the small tree into the large tree at appropriate level
+
+
+               this._insert(node, this.data.height - node.height - 1, true);
+             }
 
-         rotateRight(x) {
-           var y = x.left;
-           if (y) {
-             x.left = y.right;
-             if (y.right) y.right.parent = x;
-             y.parent = x.parent;
+             return this;
+           }
+         }, {
+           key: "insert",
+           value: function insert(item) {
+             if (item) this._insert(item, this.data.height - 1);
+             return this;
            }
+         }, {
+           key: "clear",
+           value: function clear() {
+             this.data = createNode([]);
+             return this;
+           }
+         }, {
+           key: "remove",
+           value: function remove(item, equalsFn) {
+             if (!item) return this;
+             var node = this.data;
+             var bbox = this.toBBox(item);
+             var path = [];
+             var indexes = [];
+             var i, parent, goingUp; // depth-first iterative tree traversal
+
+             while (node || path.length) {
+               if (!node) {
+                 // go up
+                 node = path.pop();
+                 parent = path[path.length - 1];
+                 i = indexes.pop();
+                 goingUp = true;
+               }
+
+               if (node.leaf) {
+                 // check current node
+                 var index = findItem(item, node.children, equalsFn);
+
+                 if (index !== -1) {
+                   // item found, remove the item and condense tree upwards
+                   node.children.splice(index, 1);
+                   path.push(node);
 
-           if (!x.parent)               this._root = y;
-           else if(x === x.parent.left) x.parent.left = y;
-           else                         x.parent.right = y;
-           if (y) y.right = x;
-           x.parent = y;
-         }
+                   this._condense(path);
+
+                   return this;
+                 }
+               }
 
+               if (!goingUp && !node.leaf && contains(node, bbox)) {
+                 // go down
+                 path.push(node);
+                 indexes.push(i);
+                 i = 0;
+                 parent = node;
+                 node = node.children[0];
+               } else if (parent) {
+                 // go right
+                 i++;
+                 node = parent.children[i];
+                 goingUp = false;
+               } else node = null; // nothing found
 
-         _splay(x) {
-           while (x.parent) {
-             var p = x.parent;
-             if (!p.parent) {
-               if (p.left === x) this.rotateRight(p);
-               else              this.rotateLeft(p);
-             } else if (p.left === x && p.parent.left === p) {
-               this.rotateRight(p.parent);
-               this.rotateRight(p);
-             } else if (p.right === x && p.parent.right === p) {
-               this.rotateLeft(p.parent);
-               this.rotateLeft(p);
-             } else if (p.left === x && p.parent.right === p) {
-               this.rotateRight(p);
-               this.rotateLeft(p);
-             } else {
-               this.rotateLeft(p);
-               this.rotateRight(p);
              }
+
+             return this;
            }
-         }
+         }, {
+           key: "toBBox",
+           value: function toBBox(item) {
+             return item;
+           }
+         }, {
+           key: "compareMinX",
+           value: function compareMinX(a, b) {
+             return a.minX - b.minX;
+           }
+         }, {
+           key: "compareMinY",
+           value: function compareMinY(a, b) {
+             return a.minY - b.minY;
+           }
+         }, {
+           key: "toJSON",
+           value: function toJSON() {
+             return this.data;
+           }
+         }, {
+           key: "fromJSON",
+           value: function fromJSON(data) {
+             this.data = data;
+             return this;
+           }
+         }, {
+           key: "_all",
+           value: function _all(node, result) {
+             var nodesToSearch = [];
 
+             while (node) {
+               if (node.leaf) result.push.apply(result, _toConsumableArray(node.children));else nodesToSearch.push.apply(nodesToSearch, _toConsumableArray(node.children));
+               node = nodesToSearch.pop();
+             }
 
-         splay(x) {
-           var p, gp, ggp, l, r;
+             return result;
+           }
+         }, {
+           key: "_build",
+           value: function _build(items, left, right, height) {
+             var N = right - left + 1;
+             var M = this._maxEntries;
+             var node;
+
+             if (N <= M) {
+               // reached leaf level; return leaf
+               node = createNode(items.slice(left, right + 1));
+               calcBBox(node, this.toBBox);
+               return node;
+             }
 
-           while (x.parent) {
-             p = x.parent;
-             gp = p.parent;
+             if (!height) {
+               // target height of the bulk-loaded tree
+               height = Math.ceil(Math.log(N) / Math.log(M)); // target number of root entries to maximize storage utilization
 
-             if (gp && gp.parent) {
-               ggp = gp.parent;
-               if (ggp.left === gp) ggp.left  = x;
-               else                 ggp.right = x;
-               x.parent = ggp;
-             } else {
-               x.parent = null;
-               this._root = x;
+               M = Math.ceil(N / Math.pow(M, height - 1));
              }
 
-             l = x.left; r = x.right;
+             node = createNode([]);
+             node.leaf = false;
+             node.height = height; // split the items into M mostly square tiles
 
-             if (x === p.left) { // left
-               if (gp) {
-                 if (gp.left === p) {
-                   /* zig-zig */
-                   if (p.right) {
-                     gp.left = p.right;
-                     gp.left.parent = gp;
-                   } else gp.left = null;
+             var N2 = Math.ceil(N / M);
+             var N1 = N2 * Math.ceil(Math.sqrt(M));
+             multiSelect(items, left, right, N1, this.compareMinX);
 
-                   p.right   = gp;
-                   gp.parent = p;
-                 } else {
-                   /* zig-zag */
-                   if (l) {
-                     gp.right = l;
-                     l.parent = gp;
-                   } else gp.right = null;
-
-                   x.left    = gp;
-                   gp.parent = x;
-                 }
+             for (var i = left; i <= right; i += N1) {
+               var right2 = Math.min(i + N1 - 1, right);
+               multiSelect(items, i, right2, N2, this.compareMinY);
+
+               for (var j = i; j <= right2; j += N2) {
+                 var right3 = Math.min(j + N2 - 1, right2); // pack each entry recursively
+
+                 node.children.push(this._build(items, j, right3, height - 1));
                }
-               if (r) {
-                 p.left = r;
-                 r.parent = p;
-               } else p.left = null;
-
-               x.right  = p;
-               p.parent = x;
-             } else { // right
-               if (gp) {
-                 if (gp.right === p) {
-                   /* zig-zig */
-                   if (p.left) {
-                     gp.right = p.left;
-                     gp.right.parent = gp;
-                   } else gp.right = null;
-
-                   p.left = gp;
-                   gp.parent = p;
-                 } else {
-                   /* zig-zag */
-                   if (r) {
-                     gp.left = r;
-                     r.parent = gp;
-                   } else gp.left = null;
-
-                   x.right   = gp;
-                   gp.parent = x;
+             }
+
+             calcBBox(node, this.toBBox);
+             return node;
+           }
+         }, {
+           key: "_chooseSubtree",
+           value: function _chooseSubtree(bbox, node, level, path) {
+             while (true) {
+               path.push(node);
+               if (node.leaf || path.length - 1 === level) break;
+               var minArea = Infinity;
+               var minEnlargement = Infinity;
+               var targetNode = void 0;
+
+               for (var i = 0; i < node.children.length; i++) {
+                 var child = node.children[i];
+                 var area = bboxArea(child);
+                 var enlargement = enlargedArea(bbox, child) - area; // choose entry with the least area enlargement
+
+                 if (enlargement < minEnlargement) {
+                   minEnlargement = enlargement;
+                   minArea = area < minArea ? area : minArea;
+                   targetNode = child;
+                 } else if (enlargement === minEnlargement) {
+                   // otherwise choose one with the smallest area
+                   if (area < minArea) {
+                     minArea = area;
+                     targetNode = child;
+                   }
                  }
                }
-               if (l) {
-                 p.right = l;
-                 l.parent = p;
-               } else p.right = null;
 
-               x.left   = p;
-               p.parent = x;
+               node = targetNode || node.children[0];
              }
+
+             return node;
            }
-         }
+         }, {
+           key: "_insert",
+           value: function _insert(item, level, isNode) {
+             var bbox = isNode ? item : this.toBBox(item);
+             var insertPath = []; // find the best node for accommodating the item, saving all nodes along the path too
 
+             var node = this._chooseSubtree(bbox, this.data, level, insertPath); // put the item into the node
 
-         replace(u, v) {
-           if (!u.parent) this._root = v;
-           else if (u === u.parent.left) u.parent.left = v;
-           else u.parent.right = v;
-           if (v) v.parent = u.parent;
-         }
 
+             node.children.push(item);
+             extend$1(node, bbox); // split on node overflow; propagate upwards if necessary
 
-         minNode(u = this._root) {
-           if (u) while (u.left) u = u.left;
-           return u;
-         }
+             while (level >= 0) {
+               if (insertPath[level].children.length > this._maxEntries) {
+                 this._split(insertPath, level);
 
+                 level--;
+               } else break;
+             } // adjust bboxes along the insertion path
 
-         maxNode(u = this._root) {
-           if (u) while (u.right) u = u.right;
-           return u;
-         }
 
+             this._adjustParentBBoxes(bbox, insertPath, level);
+           } // split overflowed node into two
+
+         }, {
+           key: "_split",
+           value: function _split(insertPath, level) {
+             var node = insertPath[level];
+             var M = node.children.length;
+             var m = this._minEntries;
 
-         insert(key, data) {
-           var z = this._root;
-           var p = null;
-           var comp = this._compare;
-           var cmp;
+             this._chooseSplitAxis(node, m, M);
 
-           if (this._noDuplicates) {
-             while (z) {
-               p = z;
-               cmp = comp(z.key, key);
-               if (cmp === 0) return;
-               else if (comp(z.key, key) < 0) z = z.right;
-               else z = z.left;
+             var splitIndex = this._chooseSplitIndex(node, m, M);
+
+             var newNode = createNode(node.children.splice(splitIndex, node.children.length - splitIndex));
+             newNode.height = node.height;
+             newNode.leaf = node.leaf;
+             calcBBox(node, this.toBBox);
+             calcBBox(newNode, this.toBBox);
+             if (level) insertPath[level - 1].children.push(newNode);else this._splitRoot(node, newNode);
+           }
+         }, {
+           key: "_splitRoot",
+           value: function _splitRoot(node, newNode) {
+             // split root node
+             this.data = createNode([node, newNode]);
+             this.data.height = node.height + 1;
+             this.data.leaf = false;
+             calcBBox(this.data, this.toBBox);
+           }
+         }, {
+           key: "_chooseSplitIndex",
+           value: function _chooseSplitIndex(node, m, M) {
+             var index;
+             var minOverlap = Infinity;
+             var minArea = Infinity;
+
+             for (var i = m; i <= M - m; i++) {
+               var bbox1 = distBBox(node, 0, i, this.toBBox);
+               var bbox2 = distBBox(node, i, M, this.toBBox);
+               var overlap = intersectionArea(bbox1, bbox2);
+               var area = bboxArea(bbox1) + bboxArea(bbox2); // choose distribution with minimum overlap
+
+               if (overlap < minOverlap) {
+                 minOverlap = overlap;
+                 index = i;
+                 minArea = area < minArea ? area : minArea;
+               } else if (overlap === minOverlap) {
+                 // otherwise choose distribution with minimum area
+                 if (area < minArea) {
+                   minArea = area;
+                   index = i;
+                 }
+               }
              }
-           } else {
-             while (z) {
-               p = z;
-               if (comp(z.key, key) < 0) z = z.right;
-               else z = z.left;
+
+             return index || M - m;
+           } // sorts node children by the best axis for split
+
+         }, {
+           key: "_chooseSplitAxis",
+           value: function _chooseSplitAxis(node, m, M) {
+             var compareMinX = node.leaf ? this.compareMinX : compareNodeMinX;
+             var compareMinY = node.leaf ? this.compareMinY : compareNodeMinY;
+
+             var xMargin = this._allDistMargin(node, m, M, compareMinX);
+
+             var yMargin = this._allDistMargin(node, m, M, compareMinY); // if total distributions margin value is minimal for x, sort by minX,
+             // otherwise it's already sorted by minY
+
+
+             if (xMargin < yMargin) node.children.sort(compareMinX);
+           } // total margin of all possible split distributions where each node is at least m full
+
+         }, {
+           key: "_allDistMargin",
+           value: function _allDistMargin(node, m, M, compare) {
+             node.children.sort(compare);
+             var toBBox = this.toBBox;
+             var leftBBox = distBBox(node, 0, m, toBBox);
+             var rightBBox = distBBox(node, M - m, M, toBBox);
+             var margin = bboxMargin(leftBBox) + bboxMargin(rightBBox);
+
+             for (var i = m; i < M - m; i++) {
+               var child = node.children[i];
+               extend$1(leftBBox, node.leaf ? toBBox(child) : child);
+               margin += bboxMargin(leftBBox);
+             }
+
+             for (var _i = M - m - 1; _i >= m; _i--) {
+               var _child = node.children[_i];
+               extend$1(rightBBox, node.leaf ? toBBox(_child) : _child);
+               margin += bboxMargin(rightBBox);
+             }
+
+             return margin;
+           }
+         }, {
+           key: "_adjustParentBBoxes",
+           value: function _adjustParentBBoxes(bbox, path, level) {
+             // adjust bboxes along the given tree path
+             for (var i = level; i >= 0; i--) {
+               extend$1(path[i], bbox);
              }
            }
+         }, {
+           key: "_condense",
+           value: function _condense(path) {
+             // go through the path, removing empty nodes and updating bboxes
+             for (var i = path.length - 1, siblings; i >= 0; i--) {
+               if (path[i].children.length === 0) {
+                 if (i > 0) {
+                   siblings = path[i - 1].children;
+                   siblings.splice(siblings.indexOf(path[i]), 1);
+                 } else this.clear();
+               } else calcBBox(path[i], this.toBBox);
+             }
+           }
+         }]);
 
-           z = { key, data, left: null, right: null, parent: p };
+         return RBush;
+       }();
 
-           if (!p)                          this._root = z;
-           else if (comp(p.key, z.key) < 0) p.right = z;
-           else                             p.left  = z;
+       function findItem(item, items, equalsFn) {
+         if (!equalsFn) return items.indexOf(item);
 
-           this.splay(z);
-           this._size++;
-           return z;
+         for (var i = 0; i < items.length; i++) {
+           if (equalsFn(item, items[i])) return i;
          }
 
+         return -1;
+       } // calculate node's bbox from bboxes of its children
 
-         find (key) {
-           var z    = this._root;
-           var comp = this._compare;
-           while (z) {
-             var cmp = comp(z.key, key);
-             if      (cmp < 0) z = z.right;
-             else if (cmp > 0) z = z.left;
-             else              return z;
-           }
-           return null;
-         }
 
-         /**
-          * Whether the tree contains a node with the given key
-          * @param  {Key} key
-          * @return {boolean} true/false
-          */
-         contains (key) {
-           var node       = this._root;
-           var comparator = this._compare;
-           while (node)  {
-             var cmp = comparator(key, node.key);
-             if      (cmp === 0) return true;
-             else if (cmp < 0)   node = node.left;
-             else                node = node.right;
-           }
+       function calcBBox(node, toBBox) {
+         distBBox(node, 0, node.children.length, toBBox, node);
+       } // min bounding rectangle of node children from k to p-1
 
-           return false;
+
+       function distBBox(node, k, p, toBBox, destNode) {
+         if (!destNode) destNode = createNode(null);
+         destNode.minX = Infinity;
+         destNode.minY = Infinity;
+         destNode.maxX = -Infinity;
+         destNode.maxY = -Infinity;
+
+         for (var i = k; i < p; i++) {
+           var child = node.children[i];
+           extend$1(destNode, node.leaf ? toBBox(child) : child);
          }
 
+         return destNode;
+       }
+
+       function extend$1(a, b) {
+         a.minX = Math.min(a.minX, b.minX);
+         a.minY = Math.min(a.minY, b.minY);
+         a.maxX = Math.max(a.maxX, b.maxX);
+         a.maxY = Math.max(a.maxY, b.maxY);
+         return a;
+       }
+
+       function compareNodeMinX(a, b) {
+         return a.minX - b.minX;
+       }
+
+       function compareNodeMinY(a, b) {
+         return a.minY - b.minY;
+       }
+
+       function bboxArea(a) {
+         return (a.maxX - a.minX) * (a.maxY - a.minY);
+       }
+
+       function bboxMargin(a) {
+         return a.maxX - a.minX + (a.maxY - a.minY);
+       }
+
+       function enlargedArea(a, b) {
+         return (Math.max(b.maxX, a.maxX) - Math.min(b.minX, a.minX)) * (Math.max(b.maxY, a.maxY) - Math.min(b.minY, a.minY));
+       }
+
+       function intersectionArea(a, b) {
+         var minX = Math.max(a.minX, b.minX);
+         var minY = Math.max(a.minY, b.minY);
+         var maxX = Math.min(a.maxX, b.maxX);
+         var maxY = Math.min(a.maxY, b.maxY);
+         return Math.max(0, maxX - minX) * Math.max(0, maxY - minY);
+       }
+
+       function contains(a, b) {
+         return a.minX <= b.minX && a.minY <= b.minY && b.maxX <= a.maxX && b.maxY <= a.maxY;
+       }
 
-         remove (key) {
-           var z = this.find(key);
+       function intersects(a, b) {
+         return b.minX <= a.maxX && b.minY <= a.maxY && b.maxX >= a.minX && b.maxY >= a.minY;
+       }
 
-           if (!z) return false;
+       function createNode(children) {
+         return {
+           children: children,
+           height: 1,
+           leaf: true,
+           minX: Infinity,
+           minY: Infinity,
+           maxX: -Infinity,
+           maxY: -Infinity
+         };
+       } // sort an array so that items come in groups of n unsorted items, with groups sorted between each other;
+       // combines selection algorithm with binary divide & conquer approach
 
-           this.splay(z);
 
-           if (!z.left) this.replace(z, z.right);
-           else if (!z.right) this.replace(z, z.left);
-           else {
-             var y = this.minNode(z.right);
-             if (y.parent !== z) {
-               this.replace(y, y.right);
-               y.right = z.right;
-               y.right.parent = y;
-             }
-             this.replace(z, y);
-             y.left = z.left;
-             y.left.parent = y;
-           }
+       function multiSelect(arr, left, right, n, compare) {
+         var stack = [left, right];
 
-           this._size--;
-           return true;
+         while (stack.length) {
+           right = stack.pop();
+           left = stack.pop();
+           if (right - left <= n) continue;
+           var mid = left + Math.ceil((right - left) / n / 2) * n;
+           quickselect$1(arr, mid, left, right, compare);
+           stack.push(left, mid, mid, right);
          }
+       }
 
+       var tiler = utilTiler();
+       var dispatch$1 = dispatch('loaded');
+       var _tileZoom = 14;
+       var _krUrlRoot = 'https://www.keepright.at';
+       var _krData = {
+         errorTypes: {},
+         localizeStrings: {}
+       }; // This gets reassigned if reset
 
-         removeNode(z) {
-           if (!z) return false;
-
-           this.splay(z);
+       var _cache;
 
-           if (!z.left) this.replace(z, z.right);
-           else if (!z.right) this.replace(z, z.left);
-           else {
-             var y = this.minNode(z.right);
-             if (y.parent !== z) {
-               this.replace(y, y.right);
-               y.right = z.right;
-               y.right.parent = y;
-             }
-             this.replace(z, y);
-             y.left = z.left;
-             y.left.parent = y;
-           }
+       var _krRuleset = [// no 20 - multiple node on same spot - these are mostly boundaries overlapping roads
+       30, 40, 50, 60, 70, 90, 100, 110, 120, 130, 150, 160, 170, 180, 190, 191, 192, 193, 194, 195, 196, 197, 198, 200, 201, 202, 203, 204, 205, 206, 207, 208, 210, 220, 230, 231, 232, 270, 280, 281, 282, 283, 284, 285, 290, 291, 292, 293, 294, 295, 296, 297, 298, 300, 310, 311, 312, 313, 320, 350, 360, 370, 380, 390, 400, 401, 402, 410, 411, 412, 413];
 
-           this._size--;
-           return true;
+       function abortRequest(controller) {
+         if (controller) {
+           controller.abort();
          }
+       }
 
+       function abortUnwantedRequests(cache, tiles) {
+         Object.keys(cache.inflightTile).forEach(function (k) {
+           var wanted = tiles.find(function (tile) {
+             return k === tile.id;
+           });
 
-         erase (key) {
-           var z = this.find(key);
-           if (!z) return;
-
-           this.splay(z);
+           if (!wanted) {
+             abortRequest(cache.inflightTile[k]);
+             delete cache.inflightTile[k];
+           }
+         });
+       }
 
-           var s = z.left;
-           var t = z.right;
+       function encodeIssueRtree(d) {
+         return {
+           minX: d.loc[0],
+           minY: d.loc[1],
+           maxX: d.loc[0],
+           maxY: d.loc[1],
+           data: d
+         };
+       } // Replace or remove QAItem from rtree
 
-           var sMax = null;
-           if (s) {
-             s.parent = null;
-             sMax = this.maxNode(s);
-             this.splay(sMax);
-             this._root = sMax;
-           }
-           if (t) {
-             if (s) sMax.right = t;
-             else   this._root = t;
-             t.parent = sMax;
-           }
 
-           this._size--;
-         }
+       function updateRtree(item, replace) {
+         _cache.rtree.remove(item, function (a, b) {
+           return a.data.id === b.data.id;
+         });
 
-         /**
-          * Removes and returns the node with smallest key
-          * @return {?Node}
-          */
-         pop () {
-           var node = this._root, returnValue = null;
-           if (node) {
-             while (node.left) node = node.left;
-             returnValue = { key: node.key, data: node.data };
-             this.remove(node.key);
-           }
-           return returnValue;
+         if (replace) {
+           _cache.rtree.insert(item);
          }
+       }
 
+       function tokenReplacements(d) {
+         if (!(d instanceof QAItem)) return;
+         var htmlRegex = new RegExp(/<\/[a-z][\s\S]*>/);
+         var replacements = {};
+         var issueTemplate = _krData.errorTypes[d.whichType];
 
-         /* eslint-disable class-methods-use-this */
+         if (!issueTemplate) {
+           /* eslint-disable no-console */
+           console.log('No Template: ', d.whichType);
+           console.log('  ', d.description);
+           /* eslint-enable no-console */
 
-         /**
-          * Successor node
-          * @param  {Node} node
-          * @return {?Node}
-          */
-         next (node) {
-           var successor = node;
-           if (successor) {
-             if (successor.right) {
-               successor = successor.right;
-               while (successor && successor.left) successor = successor.left;
-             } else {
-               successor = node.parent;
-               while (successor && successor.right === node) {
-                 node = successor; successor = successor.parent;
-               }
-             }
-           }
-           return successor;
-         }
+           return;
+         } // some descriptions are just fixed text
 
 
-         /**
-          * Predecessor node
-          * @param  {Node} node
-          * @return {?Node}
-          */
-         prev (node) {
-           var predecessor = node;
-           if (predecessor) {
-             if (predecessor.left) {
-               predecessor = predecessor.left;
-               while (predecessor && predecessor.right) predecessor = predecessor.right;
-             } else {
-               predecessor = node.parent;
-               while (predecessor && predecessor.left === node) {
-                 node = predecessor;
-                 predecessor = predecessor.parent;
-               }
-             }
-           }
-           return predecessor;
-         }
-         /* eslint-enable class-methods-use-this */
+         if (!issueTemplate.regex) return; // regex pattern should match description with variable details captured
 
+         var errorRegex = new RegExp(issueTemplate.regex, 'i');
+         var errorMatch = errorRegex.exec(d.description);
 
-         /**
-          * @param  {forEachCallback} callback
-          * @return {SplayTree}
-          */
-         forEach(callback) {
-           var current = this._root;
-           var s = [], done = false, i = 0;
-
-           while (!done) {
-             // Reach the left most Node of the current Node
-             if (current) {
-               // Place pointer to a tree node on the stack
-               // before traversing the node's left subtree
-               s.push(current);
-               current = current.left;
-             } else {
-               // BackTrack from the empty subtree and visit the Node
-               // at the top of the stack; however, if the stack is
-               // empty you are done
-               if (s.length > 0) {
-                 current = s.pop();
-                 callback(current, i++);
+         if (!errorMatch) {
+           /* eslint-disable no-console */
+           console.log('Unmatched: ', d.whichType);
+           console.log('  ', d.description);
+           console.log('  ', errorRegex);
+           /* eslint-enable no-console */
 
-                 // We have visited the node and its left
-                 // subtree. Now, it's right subtree's turn
-                 current = current.right;
-               } else done = true;
-             }
-           }
-           return this;
+           return;
          }
 
+         for (var i = 1; i < errorMatch.length; i++) {
+           // skip first
+           var capture = errorMatch[i];
+           var idType = void 0;
+           idType = 'IDs' in issueTemplate ? issueTemplate.IDs[i - 1] : '';
 
-         /**
-          * Walk key range from `low` to `high`. Stops if `fn` returns a value.
-          * @param  {Key}      low
-          * @param  {Key}      high
-          * @param  {Function} fn
-          * @param  {*?}       ctx
-          * @return {SplayTree}
-          */
-         range(low, high, fn, ctx) {
-           const Q = [];
-           const compare = this._compare;
-           let node = this._root, cmp;
+           if (idType && capture) {
+             // link IDs if present in the capture
+             capture = parseError(capture, idType);
+           } else if (htmlRegex.test(capture)) {
+             // escape any html in non-IDs
+             capture = '\\' + capture + '\\';
+           } else {
+             var compare = capture.toLowerCase();
 
-           while (Q.length !== 0 || node) {
-             if (node) {
-               Q.push(node);
-               node = node.left;
-             } else {
-               node = Q.pop();
-               cmp = compare(node.key, high);
-               if (cmp > 0) {
-                 break;
-               } else if (compare(node.key, low) >= 0) {
-                 if (fn.call(ctx, node)) return this; // stop if smth is returned
-               }
-               node = node.right;
+             if (_krData.localizeStrings[compare]) {
+               // some replacement strings can be localized
+               capture = _t('QA.keepRight.error_parts.' + _krData.localizeStrings[compare]);
              }
            }
-           return this;
-         }
 
-         /**
-          * Returns all keys in order
-          * @return {Array<Key>}
-          */
-         keys () {
-           var current = this._root;
-           var s = [], r = [], done = false;
-
-           while (!done) {
-             if (current) {
-               s.push(current);
-               current = current.left;
-             } else {
-               if (s.length > 0) {
-                 current = s.pop();
-                 r.push(current.key);
-                 current = current.right;
-               } else done = true;
-             }
-           }
-           return r;
+           replacements['var' + i] = capture;
          }
 
+         return replacements;
+       }
 
-         /**
-          * Returns `data` fields of all nodes in order.
-          * @return {Array<Value>}
-          */
-         values () {
-           var current = this._root;
-           var s = [], r = [], done = false;
-
-           while (!done) {
-             if (current) {
-               s.push(current);
-               current = current.left;
-             } else {
-               if (s.length > 0) {
-                 current = s.pop();
-                 r.push(current.data);
-                 current = current.right;
-               } else done = true;
-             }
-           }
-           return r;
+       function parseError(capture, idType) {
+         var compare = capture.toLowerCase();
+
+         if (_krData.localizeStrings[compare]) {
+           // some replacement strings can be localized
+           capture = _t('QA.keepRight.error_parts.' + _krData.localizeStrings[compare]);
          }
 
+         switch (idType) {
+           // link a string like "this node"
+           case 'this':
+             capture = linkErrorObject(capture);
+             break;
 
-         /**
-          * Returns node at given index
-          * @param  {number} index
-          * @return {?Node}
-          */
-         at (index) {
-           // removed after a consideration, more misleading than useful
-           // index = index % this.size;
-           // if (index < 0) index = this.size - index;
-
-           var current = this._root;
-           var s = [], done = false, i = 0;
-
-           while (!done) {
-             if (current) {
-               s.push(current);
-               current = current.left;
-             } else {
-               if (s.length > 0) {
-                 current = s.pop();
-                 if (i === index) return current;
-                 i++;
-                 current = current.right;
-               } else done = true;
-             }
-           }
-           return null;
-         }
+           case 'url':
+             capture = linkURL(capture);
+             break;
+           // link an entity ID
 
-         /**
-          * Bulk-load items. Both array have to be same size
-          * @param  {Array<Key>}    keys
-          * @param  {Array<Value>}  [values]
-          * @param  {Boolean}       [presort=false] Pre-sort keys and values, using
-          *                                         tree's comparator. Sorting is done
-          *                                         in-place
-          * @return {AVLTree}
-          */
-         load(keys = [], values = [], presort = false) {
-           if (this._size !== 0) throw new Error('bulk-load: tree is not empty');
-           const size = keys.length;
-           if (presort) sort(keys, values, 0, size - 1, this._compare);
-           this._root = loadRecursive(null, keys, values, 0, size);
-           this._size = size;
-           return this;
-         }
+           case 'n':
+           case 'w':
+           case 'r':
+             capture = linkEntity(idType + capture);
+             break;
+           // some errors have more complex ID lists/variance
+
+           case '20':
+             capture = parse20(capture);
+             break;
 
+           case '211':
+             capture = parse211(capture);
+             break;
 
-         min() {
-           var node = this.minNode(this._root);
-           if (node) return node.key;
-           else      return null;
-         }
+           case '231':
+             capture = parse231(capture);
+             break;
 
+           case '294':
+             capture = parse294(capture);
+             break;
 
-         max() {
-           var node = this.maxNode(this._root);
-           if (node) return node.key;
-           else      return null;
+           case '370':
+             capture = parse370(capture);
+             break;
          }
 
-         isEmpty() { return this._root === null; }
-         get size() { return this._size; }
+         return capture;
 
+         function linkErrorObject(d) {
+           return "<a class=\"error_object_link\">".concat(d, "</a>");
+         }
 
-         /**
-          * Create a tree and load it with items
-          * @param  {Array<Key>}          keys
-          * @param  {Array<Value>?}        [values]
-
-          * @param  {Function?}            [comparator]
-          * @param  {Boolean?}             [presort=false] Pre-sort keys and values, using
-          *                                               tree's comparator. Sorting is done
-          *                                               in-place
-          * @param  {Boolean?}             [noDuplicates=false]   Allow duplicates
-          * @return {SplayTree}
-          */
-         static createTree(keys, values, comparator, presort, noDuplicates) {
-           return new SplayTree(comparator, noDuplicates).load(keys, values, presort);
+         function linkEntity(d) {
+           return "<a class=\"error_entity_link\">".concat(d, "</a>");
          }
-       }
 
+         function linkURL(d) {
+           return "<a class=\"kr_external_link\" target=\"_blank\" href=\"".concat(d, "\">").concat(d, "</a>");
+         } // arbitrary node list of form: #ID, #ID, #ID...
 
-       function loadRecursive (parent, keys, values, start, end) {
-         const size = end - start;
-         if (size > 0) {
-           const middle = start + Math.floor(size / 2);
-           const key    = keys[middle];
-           const data   = values[middle];
-           const node   = { key, data, parent };
-           node.left    = loadRecursive(node, keys, values, start, middle);
-           node.right   = loadRecursive(node, keys, values, middle + 1, end);
-           return node;
-         }
-         return null;
-       }
 
+         function parse211(capture) {
+           var newList = [];
+           var items = capture.split(', ');
+           items.forEach(function (item) {
+             // ID has # at the front
+             var id = linkEntity('n' + item.slice(1));
+             newList.push(id);
+           });
+           return newList.join(', ');
+         } // arbitrary way list of form: #ID(layer),#ID(layer),#ID(layer)...
 
-       function sort(keys, values, left, right, compare) {
-         if (left >= right) return;
 
-         const pivot = keys[(left + right) >> 1];
-         let i = left - 1;
-         let j = right + 1;
+         function parse231(capture) {
+           var newList = []; // unfortunately 'layer' can itself contain commas, so we split on '),'
 
-         while (true) {
-           do i++; while (compare(keys[i], pivot) < 0);
-           do j--; while (compare(keys[j], pivot) > 0);
-           if (i >= j) break;
+           var items = capture.split('),');
+           items.forEach(function (item) {
+             var match = item.match(/\#(\d+)\((.+)\)?/);
 
-           let tmp = keys[i];
-           keys[i] = keys[j];
-           keys[j] = tmp;
+             if (match !== null && match.length > 2) {
+               newList.push(linkEntity('w' + match[1]) + ' ' + _t('QA.keepRight.errorTypes.231.layer', {
+                 layer: match[2]
+               }));
+             }
+           });
+           return newList.join(', ');
+         } // arbitrary node/relation list of form: from node #ID,to relation #ID,to node #ID...
 
-           tmp = values[i];
-           values[i] = values[j];
-           values[j] = tmp;
-         }
 
-         sort(keys, values,  left,     j, compare);
-         sort(keys, values, j + 1, right, compare);
-       }
+         function parse294(capture) {
+           var newList = [];
+           var items = capture.split(',');
+           items.forEach(function (item) {
+             // item of form "from/to node/relation #ID"
+             item = item.split(' '); // to/from role is more clear in quotes
 
-       const NORMAL               = 0;
-       const NON_CONTRIBUTING     = 1;
-       const SAME_TRANSITION      = 2;
-       const DIFFERENT_TRANSITION = 3;
+             var role = "\"".concat(item[0], "\""); // first letter of node/relation provides the type
 
-       const INTERSECTION = 0;
-       const UNION        = 1;
-       const DIFFERENCE   = 2;
-       const XOR          = 3;
+             var idType = item[1].slice(0, 1); // ID has # at the front
 
-       /**
-        * @param  {SweepEvent} event
-        * @param  {SweepEvent} prev
-        * @param  {Operation} operation
-        */
-       function computeFields (event, prev, operation) {
-         // compute inOut and otherInOut fields
-         if (prev === null) {
-           event.inOut      = false;
-           event.otherInOut = true;
+             var id = item[2].slice(1);
+             id = linkEntity(idType + id);
+             newList.push("".concat(role, " ").concat(item[1], " ").concat(id));
+           });
+           return newList.join(', ');
+         } // may or may not include the string "(including the name 'name')"
 
-         // previous line segment in sweepline belongs to the same polygon
-         } else {
-           if (event.isSubject === prev.isSubject) {
-             event.inOut      = !prev.inOut;
-             event.otherInOut = prev.otherInOut;
 
-           // previous line segment in sweepline belongs to the clipping polygon
-           } else {
-             event.inOut      = !prev.otherInOut;
-             event.otherInOut = prev.isVertical() ? !prev.inOut : prev.inOut;
-           }
+         function parse370(capture) {
+           if (!capture) return '';
+           var match = capture.match(/\(including the name (\'.+\')\)/);
 
-           // compute prevInResult field
-           if (prev) {
-             event.prevInResult = (!inResult(prev, operation) || prev.isVertical())
-               ? prev.prevInResult : prev;
+           if (match && match.length) {
+             return _t('QA.keepRight.errorTypes.370.including_the_name', {
+               name: match[1]
+             });
            }
-         }
 
-         // check if the line segment belongs to the Boolean operation
-         let isInResult = inResult(event, operation);
-         if (isInResult) {
-           event.resultTransition = determineResultTransition(event, operation);
-         } else {
-           event.resultTransition = 0;
-         }
-       }
+           return '';
+         } // arbitrary node list of form: #ID,#ID,#ID...
 
 
-       /* eslint-disable indent */
-       function inResult(event, operation) {
-         switch (event.type) {
-           case NORMAL:
-             switch (operation) {
-               case INTERSECTION:
-                 return !event.otherInOut;
-               case UNION:
-                 return event.otherInOut;
-               case DIFFERENCE:
-                 // return (event.isSubject && !event.otherInOut) ||
-                 //         (!event.isSubject && event.otherInOut);
-                 return (event.isSubject && event.otherInOut) ||
-                         (!event.isSubject && !event.otherInOut);
-               case XOR:
-                 return true;
-             }
-             break;
-           case SAME_TRANSITION:
-             return operation === INTERSECTION || operation === UNION;
-           case DIFFERENT_TRANSITION:
-             return operation === DIFFERENCE;
-           case NON_CONTRIBUTING:
-             return false;
+         function parse20(capture) {
+           var newList = [];
+           var items = capture.split(',');
+           items.forEach(function (item) {
+             // ID has # at the front
+             var id = linkEntity('n' + item.slice(1));
+             newList.push(id);
+           });
+           return newList.join(', ');
          }
-         return false;
        }
-       /* eslint-enable indent */
 
+       var serviceKeepRight = {
+         title: 'keepRight',
+         init: function init() {
+           _mainFileFetcher.get('keepRight').then(function (d) {
+             return _krData = d;
+           });
 
-       function determineResultTransition(event, operation) {
-         let thisIn = !event.inOut;
-         let thatIn = !event.otherInOut;
+           if (!_cache) {
+             this.reset();
+           }
 
-         let isIn;
-         switch (operation) {
-           case INTERSECTION:
-             isIn = thisIn && thatIn; break;
-           case UNION:
-             isIn = thisIn || thatIn; break;
-           case XOR:
-             isIn = thisIn ^ thatIn; break;
-           case DIFFERENCE:
-             if (event.isSubject) {
-               isIn = thisIn && !thatIn;
-             } else {
-               isIn = thatIn && !thisIn;
-             }
-             break;
-         }
-         return isIn ? +1 : -1;
-       }
+           this.event = utilRebind(this, dispatch$1, 'on');
+         },
+         reset: function reset() {
+           if (_cache) {
+             Object.values(_cache.inflightTile).forEach(abortRequest);
+           }
 
-       class SweepEvent {
+           _cache = {
+             data: {},
+             loadedTile: {},
+             inflightTile: {},
+             inflightPost: {},
+             closed: {},
+             rtree: new RBush()
+           };
+         },
+         // KeepRight API:  http://osm.mueschelsoft.de/keepright/interfacing.php
+         loadIssues: function loadIssues(projection) {
+           var _this = this;
 
+           var options = {
+             format: 'geojson',
+             ch: _krRuleset
+           }; // determine the needed tiles to cover the view
 
-         /**
-          * Sweepline event
-          *
-          * @class {SweepEvent}
-          * @param {Array.<Number>}  point
-          * @param {Boolean}         left
-          * @param {SweepEvent=}     otherEvent
-          * @param {Boolean}         isSubject
-          * @param {Number}          edgeType
-          */
-         constructor (point, left, otherEvent, isSubject, edgeType) {
+           var tiles = tiler.zoomExtent([_tileZoom, _tileZoom]).getTiles(projection); // abort inflight requests that are no longer needed
 
-           /**
-            * Is left endpoint?
-            * @type {Boolean}
-            */
-           this.left = left;
+           abortUnwantedRequests(_cache, tiles); // issue new requests..
 
-           /**
-            * @type {Array.<Number>}
-            */
-           this.point = point;
+           tiles.forEach(function (tile) {
+             if (_cache.loadedTile[tile.id] || _cache.inflightTile[tile.id]) return;
 
-           /**
-            * Other edge reference
-            * @type {SweepEvent}
-            */
-           this.otherEvent = otherEvent;
+             var _tile$extent$rectangl = tile.extent.rectangle(),
+                 _tile$extent$rectangl2 = _slicedToArray(_tile$extent$rectangl, 4),
+                 left = _tile$extent$rectangl2[0],
+                 top = _tile$extent$rectangl2[1],
+                 right = _tile$extent$rectangl2[2],
+                 bottom = _tile$extent$rectangl2[3];
+
+             var params = Object.assign({}, options, {
+               left: left,
+               bottom: bottom,
+               right: right,
+               top: top
+             });
+             var url = "".concat(_krUrlRoot, "/export.php?") + utilQsString(params);
+             var controller = new AbortController();
+             _cache.inflightTile[tile.id] = controller;
+             d3_json(url, {
+               signal: controller.signal
+             }).then(function (data) {
+               delete _cache.inflightTile[tile.id];
+               _cache.loadedTile[tile.id] = true;
+
+               if (!data || !data.features || !data.features.length) {
+                 throw new Error('No Data');
+               }
+
+               data.features.forEach(function (feature) {
+                 var _feature$properties = feature.properties,
+                     itemType = _feature$properties.error_type,
+                     id = _feature$properties.error_id,
+                     _feature$properties$c = _feature$properties.comment,
+                     comment = _feature$properties$c === void 0 ? null : _feature$properties$c,
+                     objectId = _feature$properties.object_id,
+                     objectType = _feature$properties.object_type,
+                     schema = _feature$properties.schema,
+                     title = _feature$properties.title;
+                 var loc = feature.geometry.coordinates,
+                     _feature$properties$d = feature.properties.description,
+                     description = _feature$properties$d === void 0 ? '' : _feature$properties$d; // if there is a parent, save its error type e.g.:
+                 //  Error 191 = "highway-highway"
+                 //  Error 190 = "intersections without junctions"  (parent)
+
+                 var issueTemplate = _krData.errorTypes[itemType];
+                 var parentIssueType = (Math.floor(itemType / 10) * 10).toString(); // try to handle error type directly, fallback to parent error type.
+
+                 var whichType = issueTemplate ? itemType : parentIssueType;
+                 var whichTemplate = _krData.errorTypes[whichType]; // Rewrite a few of the errors at this point..
+                 // This is done to make them easier to linkify and translate.
+
+                 switch (whichType) {
+                   case '170':
+                     description = "This feature has a FIXME tag: ".concat(description);
+                     break;
 
-           /**
-            * Belongs to source or clipping polygon
-            * @type {Boolean}
-            */
-           this.isSubject = isSubject;
+                   case '292':
+                   case '293':
+                     description = description.replace('A turn-', 'This turn-');
+                     break;
 
-           /**
-            * Edge contribution type
-            * @type {Number}
-            */
-           this.type = edgeType || NORMAL;
+                   case '294':
+                   case '295':
+                   case '296':
+                   case '297':
+                   case '298':
+                     description = "This turn-restriction~".concat(description);
+                     break;
 
+                   case '300':
+                     description = 'This highway is missing a maxspeed tag';
+                     break;
 
-           /**
-            * In-out transition for the sweepline crossing polygon
-            * @type {Boolean}
-            */
-           this.inOut = false;
+                   case '411':
+                   case '412':
+                   case '413':
+                     description = "This feature~".concat(description);
+                     break;
+                 } // move markers slightly so it doesn't obscure the geometry,
+                 // then move markers away from other coincident markers
+
+
+                 var coincident = false;
+
+                 do {
+                   // first time, move marker up. after that, move marker right.
+                   var delta = coincident ? [0.00001, 0] : [0, 0.00001];
+                   loc = geoVecAdd(loc, delta);
+                   var bbox = geoExtent(loc).bbox();
+                   coincident = _cache.rtree.search(bbox).length;
+                 } while (coincident);
+
+                 var d = new QAItem(loc, _this, itemType, id, {
+                   comment: comment,
+                   description: description,
+                   whichType: whichType,
+                   parentIssueType: parentIssueType,
+                   severity: whichTemplate.severity || 'error',
+                   objectId: objectId,
+                   objectType: objectType,
+                   schema: schema,
+                   title: title
+                 });
+                 d.replacements = tokenReplacements(d);
+                 _cache.data[id] = d;
 
+                 _cache.rtree.insert(encodeIssueRtree(d));
+               });
+               dispatch$1.call('loaded');
+             })["catch"](function () {
+               delete _cache.inflightTile[tile.id];
+               _cache.loadedTile[tile.id] = true;
+             });
+           });
+         },
+         postUpdate: function postUpdate(d, callback) {
+           var _this2 = this;
 
-           /**
-            * @type {Boolean}
-            */
-           this.otherInOut = false;
+           if (_cache.inflightPost[d.id]) {
+             return callback({
+               message: 'Error update already inflight',
+               status: -2
+             }, d);
+           }
 
-           /**
-            * Previous event in result?
-            * @type {SweepEvent}
-            */
-           this.prevInResult = null;
+           var params = {
+             schema: d.schema,
+             id: d.id
+           };
 
-           /**
-            * Type of result transition (0 = not in result, +1 = out-in, -1, in-out)
-            * @type {Number}
-            */
-           this.resultTransition = 0;
+           if (d.newStatus) {
+             params.st = d.newStatus;
+           }
 
-           // connection step
+           if (d.newComment !== undefined) {
+             params.co = d.newComment;
+           } // NOTE: This throws a CORS err, but it seems successful.
+           // We don't care too much about the response, so this is fine.
 
-           /**
-            * @type {Number}
-            */
-           this.otherPos = -1;
 
-           /**
-            * @type {Number}
-            */
-           this.outputContourId = -1;
+           var url = "".concat(_krUrlRoot, "/comment.php?") + utilQsString(params);
+           var controller = new AbortController();
+           _cache.inflightPost[d.id] = controller; // Since this is expected to throw an error just continue as if it worked
+           // (worst case scenario the request truly fails and issue will show up if iD restarts)
 
-           this.isExteriorRing = true;   // TODO: Looks unused, remove?
-         }
+           d3_json(url, {
+             signal: controller.signal
+           })["finally"](function () {
+             delete _cache.inflightPost[d.id];
 
+             if (d.newStatus === 'ignore') {
+               // ignore permanently (false positive)
+               _this2.removeItem(d);
+             } else if (d.newStatus === 'ignore_t') {
+               // ignore temporarily (error fixed)
+               _this2.removeItem(d);
 
-         /**
-          * @param  {Array.<Number>}  p
-          * @return {Boolean}
-          */
-         isBelow (p) {
-           const p0 = this.point, p1 = this.otherEvent.point;
-           return this.left
-             ? (p0[0] - p[0]) * (p1[1] - p[1]) - (p1[0] - p[0]) * (p0[1] - p[1]) > 0
-             // signedArea(this.point, this.otherEvent.point, p) > 0 :
-             : (p1[0] - p[0]) * (p0[1] - p[1]) - (p0[0] - p[0]) * (p1[1] - p[1]) > 0;
-             //signedArea(this.otherEvent.point, this.point, p) > 0;
-         }
+               _cache.closed["".concat(d.schema, ":").concat(d.id)] = true;
+             } else {
+               d = _this2.replaceItem(d.update({
+                 comment: d.newComment,
+                 newComment: undefined,
+                 newState: undefined
+               }));
+             }
 
+             if (callback) callback(null, d);
+           });
+         },
+         // Get all cached QAItems covering the viewport
+         getItems: function getItems(projection) {
+           var viewport = projection.clipExtent();
+           var min = [viewport[0][0], viewport[1][1]];
+           var max = [viewport[1][0], viewport[0][1]];
+           var bbox = geoExtent(projection.invert(min), projection.invert(max)).bbox();
+           return _cache.rtree.search(bbox).map(function (d) {
+             return d.data;
+           });
+         },
+         // Get a QAItem from cache
+         // NOTE: Don't change method name until UI v3 is merged
+         getError: function getError(id) {
+           return _cache.data[id];
+         },
+         // Replace a single QAItem in the cache
+         replaceItem: function replaceItem(item) {
+           if (!(item instanceof QAItem) || !item.id) return;
+           _cache.data[item.id] = item;
+           updateRtree(encodeIssueRtree(item), true); // true = replace
 
-         /**
-          * @param  {Array.<Number>}  p
-          * @return {Boolean}
-          */
-         isAbove (p) {
-           return !this.isBelow(p);
+           return item;
+         },
+         // Remove a single QAItem from the cache
+         removeItem: function removeItem(item) {
+           if (!(item instanceof QAItem) || !item.id) return;
+           delete _cache.data[item.id];
+           updateRtree(encodeIssueRtree(item), false); // false = remove
+         },
+         issueURL: function issueURL(item) {
+           return "".concat(_krUrlRoot, "/report_map.php?schema=").concat(item.schema, "&error=").concat(item.id);
+         },
+         // Get an array of issues closed during this session.
+         // Used to populate `closed:keepright` changeset tag
+         getClosedIDs: function getClosedIDs() {
+           return Object.keys(_cache.closed).sort();
          }
+       };
 
+       var tiler$1 = utilTiler();
+       var dispatch$2 = dispatch('loaded');
+       var _tileZoom$1 = 14;
+       var _impOsmUrls = {
+         ow: 'https://grab.community.improve-osm.org/directionOfFlowService',
+         mr: 'https://grab.community.improve-osm.org/missingGeoService',
+         tr: 'https://grab.community.improve-osm.org/turnRestrictionService'
+       };
+       var _impOsmData = {
+         icons: {}
+       }; // This gets reassigned if reset
 
-         /**
-          * @return {Boolean}
-          */
-         isVertical () {
-           return this.point[0] === this.otherEvent.point[0];
-         }
+       var _cache$1;
 
+       function abortRequest$1(i) {
+         Object.values(i).forEach(function (controller) {
+           if (controller) {
+             controller.abort();
+           }
+         });
+       }
 
-         /**
-          * Does event belong to result?
-          * @return {Boolean}
-          */
-         get inResult() {
-           return this.resultTransition !== 0;
-         }
+       function abortUnwantedRequests$1(cache, tiles) {
+         Object.keys(cache.inflightTile).forEach(function (k) {
+           var wanted = tiles.find(function (tile) {
+             return k === tile.id;
+           });
 
+           if (!wanted) {
+             abortRequest$1(cache.inflightTile[k]);
+             delete cache.inflightTile[k];
+           }
+         });
+       }
 
-         clone () {
-           const copy = new SweepEvent(
-             this.point, this.left, this.otherEvent, this.isSubject, this.type);
+       function encodeIssueRtree$1(d) {
+         return {
+           minX: d.loc[0],
+           minY: d.loc[1],
+           maxX: d.loc[0],
+           maxY: d.loc[1],
+           data: d
+         };
+       } // Replace or remove QAItem from rtree
 
-           copy.contourId        = this.contourId;
-           copy.resultTransition = this.resultTransition;
-           copy.prevInResult     = this.prevInResult;
-           copy.isExteriorRing   = this.isExteriorRing;
-           copy.inOut            = this.inOut;
-           copy.otherInOut       = this.otherInOut;
 
-           return copy;
-         }
-       }
+       function updateRtree$1(item, replace) {
+         _cache$1.rtree.remove(item, function (a, b) {
+           return a.data.id === b.data.id;
+         });
 
-       function equals(p1, p2) {
-         if (p1[0] === p2[0]) {
-           if (p1[1] === p2[1]) {
-             return true;
-           } else {
-             return false;
-           }
+         if (replace) {
+           _cache$1.rtree.insert(item);
          }
-         return false;
        }
 
-       // const EPSILON = 1e-9;
-       // const abs = Math.abs;
-       // TODO https://github.com/w8r/martinez/issues/6#issuecomment-262847164
-       // Precision problem.
-       //
-       // module.exports = function equals(p1, p2) {
-       //   return abs(p1[0] - p2[0]) <= EPSILON && abs(p1[1] - p2[1]) <= EPSILON;
-       // };
+       function linkErrorObject(d) {
+         return "<a class=\"error_object_link\">".concat(d, "</a>");
+       }
 
-       const epsilon$1 = 1.1102230246251565e-16;
-       const splitter = 134217729;
-       const resulterrbound = (3 + 8 * epsilon$1) * epsilon$1;
-
-       // fast_expansion_sum_zeroelim routine from oritinal code
-       function sum$1(elen, e, flen, f, h) {
-           let Q, Qnew, hh, bvirt;
-           let enow = e[0];
-           let fnow = f[0];
-           let eindex = 0;
-           let findex = 0;
-           if ((fnow > enow) === (fnow > -enow)) {
-               Q = enow;
-               enow = e[++eindex];
-           } else {
-               Q = fnow;
-               fnow = f[++findex];
-           }
-           let hindex = 0;
-           if (eindex < elen && findex < flen) {
-               if ((fnow > enow) === (fnow > -enow)) {
-                   Qnew = enow + Q;
-                   hh = Q - (Qnew - enow);
-                   enow = e[++eindex];
-               } else {
-                   Qnew = fnow + Q;
-                   hh = Q - (Qnew - fnow);
-                   fnow = f[++findex];
-               }
-               Q = Qnew;
-               if (hh !== 0) {
-                   h[hindex++] = hh;
-               }
-               while (eindex < elen && findex < flen) {
-                   if ((fnow > enow) === (fnow > -enow)) {
-                       Qnew = Q + enow;
-                       bvirt = Qnew - Q;
-                       hh = Q - (Qnew - bvirt) + (enow - bvirt);
-                       enow = e[++eindex];
-                   } else {
-                       Qnew = Q + fnow;
-                       bvirt = Qnew - Q;
-                       hh = Q - (Qnew - bvirt) + (fnow - bvirt);
-                       fnow = f[++findex];
-                   }
-                   Q = Qnew;
-                   if (hh !== 0) {
-                       h[hindex++] = hh;
-                   }
-               }
-           }
-           while (eindex < elen) {
-               Qnew = Q + enow;
-               bvirt = Qnew - Q;
-               hh = Q - (Qnew - bvirt) + (enow - bvirt);
-               enow = e[++eindex];
-               Q = Qnew;
-               if (hh !== 0) {
-                   h[hindex++] = hh;
-               }
-           }
-           while (findex < flen) {
-               Qnew = Q + fnow;
-               bvirt = Qnew - Q;
-               hh = Q - (Qnew - bvirt) + (fnow - bvirt);
-               fnow = f[++findex];
-               Q = Qnew;
-               if (hh !== 0) {
-                   h[hindex++] = hh;
-               }
-           }
-           if (Q !== 0 || hindex === 0) {
-               h[hindex++] = Q;
-           }
-           return hindex;
+       function linkEntity(d) {
+         return "<a class=\"error_entity_link\">".concat(d, "</a>");
        }
 
-       function estimate(elen, e) {
-           let Q = e[0];
-           for (let i = 1; i < elen; i++) Q += e[i];
-           return Q;
+       function pointAverage(points) {
+         if (points.length) {
+           var sum = points.reduce(function (acc, point) {
+             return geoVecAdd(acc, [point.lon, point.lat]);
+           }, [0, 0]);
+           return geoVecScale(sum, 1 / points.length);
+         } else {
+           return [0, 0];
+         }
        }
 
-       function vec(n) {
-           return new Float64Array(n);
-       }
+       function relativeBearing(p1, p2) {
+         var angle = Math.atan2(p2.lon - p1.lon, p2.lat - p1.lat);
+
+         if (angle < 0) {
+           angle += 2 * Math.PI;
+         } // Return degrees
+
+
+         return angle * 180 / Math.PI;
+       } // Assuming range [0,360)
+
+
+       function cardinalDirection(bearing) {
+         var dir = 45 * Math.round(bearing / 45);
+         var compass = {
+           0: 'north',
+           45: 'northeast',
+           90: 'east',
+           135: 'southeast',
+           180: 'south',
+           225: 'southwest',
+           270: 'west',
+           315: 'northwest',
+           360: 'north'
+         };
+         return _t("QA.improveOSM.directions.".concat(compass[dir]));
+       } // Errors shouldn't obscure each other
+
 
-       const ccwerrboundA = (3 + 16 * epsilon$1) * epsilon$1;
-       const ccwerrboundB = (2 + 12 * epsilon$1) * epsilon$1;
-       const ccwerrboundC = (9 + 64 * epsilon$1) * epsilon$1 * epsilon$1;
+       function preventCoincident(loc, bumpUp) {
+         var coincident = false;
 
-       const B = vec(4);
-       const C1 = vec(8);
-       const C2 = vec(12);
-       const D = vec(16);
-       const u = vec(4);
+         do {
+           // first time, move marker up. after that, move marker right.
+           var delta = coincident ? [0.00001, 0] : bumpUp ? [0, 0.00001] : [0, 0];
+           loc = geoVecAdd(loc, delta);
+           var bbox = geoExtent(loc).bbox();
+           coincident = _cache$1.rtree.search(bbox).length;
+         } while (coincident);
 
-       function orient2dadapt(ax, ay, bx, by, cx, cy, detsum) {
-           let acxtail, acytail, bcxtail, bcytail;
-           let bvirt, c, ahi, alo, bhi, blo, _i, _j, _0, s1, s0, t1, t0, u3;
-
-           const acx = ax - cx;
-           const bcx = bx - cx;
-           const acy = ay - cy;
-           const bcy = by - cy;
-
-           s1 = acx * bcy;
-           c = splitter * acx;
-           ahi = c - (c - acx);
-           alo = acx - ahi;
-           c = splitter * bcy;
-           bhi = c - (c - bcy);
-           blo = bcy - bhi;
-           s0 = alo * blo - (s1 - ahi * bhi - alo * bhi - ahi * blo);
-           t1 = acy * bcx;
-           c = splitter * acy;
-           ahi = c - (c - acy);
-           alo = acy - ahi;
-           c = splitter * bcx;
-           bhi = c - (c - bcx);
-           blo = bcx - bhi;
-           t0 = alo * blo - (t1 - ahi * bhi - alo * bhi - ahi * blo);
-           _i = s0 - t0;
-           bvirt = s0 - _i;
-           B[0] = s0 - (_i + bvirt) + (bvirt - t0);
-           _j = s1 + _i;
-           bvirt = _j - s1;
-           _0 = s1 - (_j - bvirt) + (_i - bvirt);
-           _i = _0 - t1;
-           bvirt = _0 - _i;
-           B[1] = _0 - (_i + bvirt) + (bvirt - t1);
-           u3 = _j + _i;
-           bvirt = u3 - _j;
-           B[2] = _j - (u3 - bvirt) + (_i - bvirt);
-           B[3] = u3;
-
-           let det = estimate(4, B);
-           let errbound = ccwerrboundB * detsum;
-           if (det >= errbound || -det >= errbound) {
-               return det;
-           }
-
-           bvirt = ax - acx;
-           acxtail = ax - (acx + bvirt) + (bvirt - cx);
-           bvirt = bx - bcx;
-           bcxtail = bx - (bcx + bvirt) + (bvirt - cx);
-           bvirt = ay - acy;
-           acytail = ay - (acy + bvirt) + (bvirt - cy);
-           bvirt = by - bcy;
-           bcytail = by - (bcy + bvirt) + (bvirt - cy);
-
-           if (acxtail === 0 && acytail === 0 && bcxtail === 0 && bcytail === 0) {
-               return det;
-           }
-
-           errbound = ccwerrboundC * detsum + resulterrbound * Math.abs(det);
-           det += (acx * bcytail + bcy * acxtail) - (acy * bcxtail + bcx * acytail);
-           if (det >= errbound || -det >= errbound) return det;
-
-           s1 = acxtail * bcy;
-           c = splitter * acxtail;
-           ahi = c - (c - acxtail);
-           alo = acxtail - ahi;
-           c = splitter * bcy;
-           bhi = c - (c - bcy);
-           blo = bcy - bhi;
-           s0 = alo * blo - (s1 - ahi * bhi - alo * bhi - ahi * blo);
-           t1 = acytail * bcx;
-           c = splitter * acytail;
-           ahi = c - (c - acytail);
-           alo = acytail - ahi;
-           c = splitter * bcx;
-           bhi = c - (c - bcx);
-           blo = bcx - bhi;
-           t0 = alo * blo - (t1 - ahi * bhi - alo * bhi - ahi * blo);
-           _i = s0 - t0;
-           bvirt = s0 - _i;
-           u[0] = s0 - (_i + bvirt) + (bvirt - t0);
-           _j = s1 + _i;
-           bvirt = _j - s1;
-           _0 = s1 - (_j - bvirt) + (_i - bvirt);
-           _i = _0 - t1;
-           bvirt = _0 - _i;
-           u[1] = _0 - (_i + bvirt) + (bvirt - t1);
-           u3 = _j + _i;
-           bvirt = u3 - _j;
-           u[2] = _j - (u3 - bvirt) + (_i - bvirt);
-           u[3] = u3;
-           const C1len = sum$1(4, B, 4, u, C1);
-
-           s1 = acx * bcytail;
-           c = splitter * acx;
-           ahi = c - (c - acx);
-           alo = acx - ahi;
-           c = splitter * bcytail;
-           bhi = c - (c - bcytail);
-           blo = bcytail - bhi;
-           s0 = alo * blo - (s1 - ahi * bhi - alo * bhi - ahi * blo);
-           t1 = acy * bcxtail;
-           c = splitter * acy;
-           ahi = c - (c - acy);
-           alo = acy - ahi;
-           c = splitter * bcxtail;
-           bhi = c - (c - bcxtail);
-           blo = bcxtail - bhi;
-           t0 = alo * blo - (t1 - ahi * bhi - alo * bhi - ahi * blo);
-           _i = s0 - t0;
-           bvirt = s0 - _i;
-           u[0] = s0 - (_i + bvirt) + (bvirt - t0);
-           _j = s1 + _i;
-           bvirt = _j - s1;
-           _0 = s1 - (_j - bvirt) + (_i - bvirt);
-           _i = _0 - t1;
-           bvirt = _0 - _i;
-           u[1] = _0 - (_i + bvirt) + (bvirt - t1);
-           u3 = _j + _i;
-           bvirt = u3 - _j;
-           u[2] = _j - (u3 - bvirt) + (_i - bvirt);
-           u[3] = u3;
-           const C2len = sum$1(C1len, C1, 4, u, C2);
-
-           s1 = acxtail * bcytail;
-           c = splitter * acxtail;
-           ahi = c - (c - acxtail);
-           alo = acxtail - ahi;
-           c = splitter * bcytail;
-           bhi = c - (c - bcytail);
-           blo = bcytail - bhi;
-           s0 = alo * blo - (s1 - ahi * bhi - alo * bhi - ahi * blo);
-           t1 = acytail * bcxtail;
-           c = splitter * acytail;
-           ahi = c - (c - acytail);
-           alo = acytail - ahi;
-           c = splitter * bcxtail;
-           bhi = c - (c - bcxtail);
-           blo = bcxtail - bhi;
-           t0 = alo * blo - (t1 - ahi * bhi - alo * bhi - ahi * blo);
-           _i = s0 - t0;
-           bvirt = s0 - _i;
-           u[0] = s0 - (_i + bvirt) + (bvirt - t0);
-           _j = s1 + _i;
-           bvirt = _j - s1;
-           _0 = s1 - (_j - bvirt) + (_i - bvirt);
-           _i = _0 - t1;
-           bvirt = _0 - _i;
-           u[1] = _0 - (_i + bvirt) + (bvirt - t1);
-           u3 = _j + _i;
-           bvirt = u3 - _j;
-           u[2] = _j - (u3 - bvirt) + (_i - bvirt);
-           u[3] = u3;
-           const Dlen = sum$1(C2len, C2, 4, u, D);
-
-           return D[Dlen - 1];
+         return loc;
        }
 
-       function orient2d(ax, ay, bx, by, cx, cy) {
-           const detleft = (ay - cy) * (bx - cx);
-           const detright = (ax - cx) * (by - cy);
-           const det = detleft - detright;
-
-           if (detleft === 0 || detright === 0 || (detleft > 0) !== (detright > 0)) return det;
+       var serviceImproveOSM = {
+         title: 'improveOSM',
+         init: function init() {
+           _mainFileFetcher.get('qa_data').then(function (d) {
+             return _impOsmData = d.improveOSM;
+           });
 
-           const detsum = Math.abs(detleft + detright);
-           if (Math.abs(det) >= ccwerrboundA * detsum) return det;
+           if (!_cache$1) {
+             this.reset();
+           }
 
-           return -orient2dadapt(ax, ay, bx, by, cx, cy, detsum);
-       }
+           this.event = utilRebind(this, dispatch$2, 'on');
+         },
+         reset: function reset() {
+           if (_cache$1) {
+             Object.values(_cache$1.inflightTile).forEach(abortRequest$1);
+           }
 
-       /**
-        * Signed area of the triangle (p0, p1, p2)
-        * @param  {Array.<Number>} p0
-        * @param  {Array.<Number>} p1
-        * @param  {Array.<Number>} p2
-        * @return {Number}
-        */
-       function signedArea(p0, p1, p2) {
-         const res = orient2d(p0[0], p0[1], p1[0], p1[1], p2[0], p2[1]);
-         if (res > 0) return -1;
-         if (res < 0) return 1;
-         return 0;
-       }
+           _cache$1 = {
+             data: {},
+             loadedTile: {},
+             inflightTile: {},
+             inflightPost: {},
+             closed: {},
+             rtree: new RBush()
+           };
+         },
+         loadIssues: function loadIssues(projection) {
+           var _this = this;
 
-       /**
-        * @param  {SweepEvent} e1
-        * @param  {SweepEvent} e2
-        * @return {Number}
-        */
-       function compareEvents(e1, e2) {
-         const p1 = e1.point;
-         const p2 = e2.point;
+           var options = {
+             client: 'iD',
+             status: 'OPEN',
+             zoom: '19' // Use a high zoom so that clusters aren't returned
 
-         // Different x-coordinate
-         if (p1[0] > p2[0]) return 1;
-         if (p1[0] < p2[0]) return -1;
+           }; // determine the needed tiles to cover the view
 
-         // Different points, but same x-coordinate
-         // Event with lower y-coordinate is processed first
-         if (p1[1] !== p2[1]) return p1[1] > p2[1] ? 1 : -1;
+           var tiles = tiler$1.zoomExtent([_tileZoom$1, _tileZoom$1]).getTiles(projection); // abort inflight requests that are no longer needed
 
-         return specialCases(e1, e2, p1);
-       }
+           abortUnwantedRequests$1(_cache$1, tiles); // issue new requests..
 
+           tiles.forEach(function (tile) {
+             if (_cache$1.loadedTile[tile.id] || _cache$1.inflightTile[tile.id]) return;
 
-       /* eslint-disable no-unused-vars */
-       function specialCases(e1, e2, p1, p2) {
-         // Same coordinates, but one is a left endpoint and the other is
-         // a right endpoint. The right endpoint is processed first
-         if (e1.left !== e2.left)
-           return e1.left ? 1 : -1;
+             var _tile$extent$rectangl = tile.extent.rectangle(),
+                 _tile$extent$rectangl2 = _slicedToArray(_tile$extent$rectangl, 4),
+                 east = _tile$extent$rectangl2[0],
+                 north = _tile$extent$rectangl2[1],
+                 west = _tile$extent$rectangl2[2],
+                 south = _tile$extent$rectangl2[3];
+
+             var params = Object.assign({}, options, {
+               east: east,
+               south: south,
+               west: west,
+               north: north
+             }); // 3 separate requests to store for each tile
+
+             var requests = {};
+             Object.keys(_impOsmUrls).forEach(function (k) {
+               // We exclude WATER from missing geometry as it doesn't seem useful
+               // We use most confident one-way and turn restrictions only, still have false positives
+               var kParams = Object.assign({}, params, k === 'mr' ? {
+                 type: 'PARKING,ROAD,BOTH,PATH'
+               } : {
+                 confidenceLevel: 'C1'
+               });
+               var url = "".concat(_impOsmUrls[k], "/search?") + utilQsString(kParams);
+               var controller = new AbortController();
+               requests[k] = controller;
+               d3_json(url, {
+                 signal: controller.signal
+               }).then(function (data) {
+                 delete _cache$1.inflightTile[tile.id][k];
+
+                 if (!Object.keys(_cache$1.inflightTile[tile.id]).length) {
+                   delete _cache$1.inflightTile[tile.id];
+                   _cache$1.loadedTile[tile.id] = true;
+                 } // Road segments at high zoom == oneways
+
+
+                 if (data.roadSegments) {
+                   data.roadSegments.forEach(function (feature) {
+                     // Position error at the approximate middle of the segment
+                     var points = feature.points,
+                         wayId = feature.wayId,
+                         fromNodeId = feature.fromNodeId,
+                         toNodeId = feature.toNodeId;
+                     var itemId = "".concat(wayId).concat(fromNodeId).concat(toNodeId);
+                     var mid = points.length / 2;
+                     var loc; // Even number of points, find midpoint of the middle two
+                     // Odd number of points, use position of very middle point
+
+                     if (mid % 1 === 0) {
+                       loc = pointAverage([points[mid - 1], points[mid]]);
+                     } else {
+                       mid = points[Math.floor(mid)];
+                       loc = [mid.lon, mid.lat];
+                     } // One-ways can land on same segment in opposite direction
+
+
+                     loc = preventCoincident(loc, false);
+                     var d = new QAItem(loc, _this, k, itemId, {
+                       issueKey: k,
+                       // used as a category
+                       identifier: {
+                         // used to post changes
+                         wayId: wayId,
+                         fromNodeId: fromNodeId,
+                         toNodeId: toNodeId
+                       },
+                       objectId: wayId,
+                       objectType: 'way'
+                     }); // Variables used in the description
+
+                     d.replacements = {
+                       percentage: feature.percentOfTrips,
+                       num_trips: feature.numberOfTrips,
+                       highway: linkErrorObject(_t('QA.keepRight.error_parts.highway')),
+                       from_node: linkEntity('n' + feature.fromNodeId),
+                       to_node: linkEntity('n' + feature.toNodeId)
+                     };
+                     _cache$1.data[d.id] = d;
+
+                     _cache$1.rtree.insert(encodeIssueRtree$1(d));
+                   });
+                 } // Tiles at high zoom == missing roads
+
+
+                 if (data.tiles) {
+                   data.tiles.forEach(function (feature) {
+                     var type = feature.type,
+                         x = feature.x,
+                         y = feature.y,
+                         numberOfTrips = feature.numberOfTrips;
+                     var geoType = type.toLowerCase();
+                     var itemId = "".concat(geoType).concat(x).concat(y).concat(numberOfTrips); // Average of recorded points should land on the missing geometry
+                     // Missing geometry could happen to land on another error
+
+                     var loc = pointAverage(feature.points);
+                     loc = preventCoincident(loc, false);
+                     var d = new QAItem(loc, _this, "".concat(k, "-").concat(geoType), itemId, {
+                       issueKey: k,
+                       identifier: {
+                         x: x,
+                         y: y
+                       }
+                     });
+                     d.replacements = {
+                       num_trips: numberOfTrips,
+                       geometry_type: _t("QA.improveOSM.geometry_types.".concat(geoType))
+                     }; // -1 trips indicates data came from a 3rd party
 
-         // const p2 = e1.otherEvent.point, p3 = e2.otherEvent.point;
-         // const sa = (p1[0] - p3[0]) * (p2[1] - p3[1]) - (p2[0] - p3[0]) * (p1[1] - p3[1])
-         // Same coordinates, both events
-         // are left endpoints or right endpoints.
-         // not collinear
-         if (signedArea(p1, e1.otherEvent.point, e2.otherEvent.point) !== 0) {
-           // the event associate to the bottom segment is processed first
-           return (!e1.isBelow(e2.otherEvent.point)) ? 1 : -1;
-         }
+                     if (numberOfTrips === -1) {
+                       d.desc = _t('QA.improveOSM.error_types.mr.description_alt', d.replacements);
+                     }
 
-         return (!e1.isSubject && e2.isSubject) ? 1 : -1;
-       }
-       /* eslint-enable no-unused-vars */
+                     _cache$1.data[d.id] = d;
 
-       /**
-        * @param  {SweepEvent} se
-        * @param  {Array.<Number>} p
-        * @param  {Queue} queue
-        * @return {Queue}
-        */
-       function divideSegment(se, p, queue)  {
-         const r = new SweepEvent(p, false, se,            se.isSubject);
-         const l = new SweepEvent(p, true,  se.otherEvent, se.isSubject);
+                     _cache$1.rtree.insert(encodeIssueRtree$1(d));
+                   });
+                 } // Entities at high zoom == turn restrictions
+
+
+                 if (data.entities) {
+                   data.entities.forEach(function (feature) {
+                     var point = feature.point,
+                         id = feature.id,
+                         segments = feature.segments,
+                         numberOfPasses = feature.numberOfPasses,
+                         turnType = feature.turnType;
+                     var itemId = "".concat(id.replace(/[,:+#]/g, '_')); // Turn restrictions could be missing at same junction
+                     // We also want to bump the error up so node is accessible
+
+                     var loc = preventCoincident([point.lon, point.lat], true); // Elements are presented in a strange way
+
+                     var ids = id.split(',');
+                     var from_way = ids[0];
+                     var via_node = ids[3];
+                     var to_way = ids[2].split(':')[1];
+                     var d = new QAItem(loc, _this, k, itemId, {
+                       issueKey: k,
+                       identifier: id,
+                       objectId: via_node,
+                       objectType: 'node'
+                     }); // Travel direction along from_way clarifies the turn restriction
+
+                     var _segments$0$points = _slicedToArray(segments[0].points, 2),
+                         p1 = _segments$0$points[0],
+                         p2 = _segments$0$points[1];
+
+                     var dir_of_travel = cardinalDirection(relativeBearing(p1, p2)); // Variables used in the description
+
+                     d.replacements = {
+                       num_passed: numberOfPasses,
+                       num_trips: segments[0].numberOfTrips,
+                       turn_restriction: turnType.toLowerCase(),
+                       from_way: linkEntity('w' + from_way),
+                       to_way: linkEntity('w' + to_way),
+                       travel_direction: dir_of_travel,
+                       junction: linkErrorObject(_t('QA.keepRight.error_parts.this_node'))
+                     };
+                     _cache$1.data[d.id] = d;
+
+                     _cache$1.rtree.insert(encodeIssueRtree$1(d));
+
+                     dispatch$2.call('loaded');
+                   });
+                 }
+               })["catch"](function () {
+                 delete _cache$1.inflightTile[tile.id][k];
 
-         /* eslint-disable no-console */
-         if (equals(se.point, se.otherEvent.point)) {
-           console.warn('what is that, a collapsed segment?', se);
-         }
-         /* eslint-enable no-console */
+                 if (!Object.keys(_cache$1.inflightTile[tile.id]).length) {
+                   delete _cache$1.inflightTile[tile.id];
+                   _cache$1.loadedTile[tile.id] = true;
+                 }
+               });
+             });
+             _cache$1.inflightTile[tile.id] = requests;
+           });
+         },
+         getComments: function getComments(item) {
+           var _this2 = this;
 
-         r.contourId = l.contourId = se.contourId;
+           // If comments already retrieved no need to do so again
+           if (item.comments) {
+             return Promise.resolve(item);
+           }
 
-         // avoid a rounding error. The left event would be processed after the right event
-         if (compareEvents(l, se.otherEvent) > 0) {
-           se.otherEvent.left = true;
-           l.left = false;
-         }
+           var key = item.issueKey;
+           var qParams = {};
 
-         // avoid a rounding error. The left event would be processed after the right event
-         // if (compareEvents(se, r) > 0) {}
+           if (key === 'ow') {
+             qParams = item.identifier;
+           } else if (key === 'mr') {
+             qParams.tileX = item.identifier.x;
+             qParams.tileY = item.identifier.y;
+           } else if (key === 'tr') {
+             qParams.targetId = item.identifier;
+           }
 
-         se.otherEvent.otherEvent = l;
-         se.otherEvent = r;
+           var url = "".concat(_impOsmUrls[key], "/retrieveComments?") + utilQsString(qParams);
 
-         queue.push(l);
-         queue.push(r);
+           var cacheComments = function cacheComments(data) {
+             // Assign directly for immediate use afterwards
+             // comments are served newest to oldest
+             item.comments = data.comments ? data.comments.reverse() : [];
 
-         return queue;
-       }
+             _this2.replaceItem(item);
+           };
 
-       //const EPS = 1e-9;
+           return d3_json(url).then(cacheComments).then(function () {
+             return item;
+           });
+         },
+         postUpdate: function postUpdate(d, callback) {
+           if (!serviceOsm.authenticated()) {
+             // Username required in payload
+             return callback({
+               message: 'Not Authenticated',
+               status: -3
+             }, d);
+           }
 
-       /**
-        * Finds the magnitude of the cross product of two vectors (if we pretend
-        * they're in three dimensions)
-        *
-        * @param {Object} a First vector
-        * @param {Object} b Second vector
-        * @private
-        * @returns {Number} The magnitude of the cross product
-        */
-       function crossProduct(a, b) {
-         return (a[0] * b[1]) - (a[1] * b[0]);
-       }
+           if (_cache$1.inflightPost[d.id]) {
+             return callback({
+               message: 'Error update already inflight',
+               status: -2
+             }, d);
+           } // Payload can only be sent once username is established
 
-       /**
-        * Finds the dot product of two vectors.
-        *
-        * @param {Object} a First vector
-        * @param {Object} b Second vector
-        * @private
-        * @returns {Number} The dot product
-        */
-       function dotProduct(a, b) {
-         return (a[0] * b[0]) + (a[1] * b[1]);
-       }
 
-       /**
-        * Finds the intersection (if any) between two line segments a and b, given the
-        * line segments' end points a1, a2 and b1, b2.
-        *
-        * This algorithm is based on Schneider and Eberly.
-        * http://www.cimec.org.ar/~ncalvo/Schneider_Eberly.pdf
-        * Page 244.
-        *
-        * @param {Array.<Number>} a1 point of first line
-        * @param {Array.<Number>} a2 point of first line
-        * @param {Array.<Number>} b1 point of second line
-        * @param {Array.<Number>} b2 point of second line
-        * @param {Boolean=}       noEndpointTouch whether to skip single touchpoints
-        *                                         (meaning connected segments) as
-        *                                         intersections
-        * @returns {Array.<Array.<Number>>|Null} If the lines intersect, the point of
-        * intersection. If they overlap, the two end points of the overlapping segment.
-        * Otherwise, null.
-        */
-       function intersection (a1, a2, b1, b2, noEndpointTouch) {
-         // The algorithm expects our lines in the form P + sd, where P is a point,
-         // s is on the interval [0, 1], and d is a vector.
-         // We are passed two points. P can be the first point of each pair. The
-         // vector, then, could be thought of as the distance (in x and y components)
-         // from the first point to the second point.
-         // So first, let's make our vectors:
-         const va = [a2[0] - a1[0], a2[1] - a1[1]];
-         const vb = [b2[0] - b1[0], b2[1] - b1[1]];
-         // We also define a function to convert back to regular point form:
+           serviceOsm.userDetails(sendPayload.bind(this));
 
-         /* eslint-disable arrow-body-style */
+           function sendPayload(err, user) {
+             var _this3 = this;
 
-         function toPoint(p, s, d) {
-           return [
-             p[0] + s * d[0],
-             p[1] + s * d[1]
-           ];
-         }
+             if (err) {
+               return callback(err, d);
+             }
 
-         /* eslint-enable arrow-body-style */
+             var key = d.issueKey;
+             var url = "".concat(_impOsmUrls[key], "/comment");
+             var payload = {
+               username: user.display_name,
+               targetIds: [d.identifier]
+             };
 
-         // The rest is pretty much a straight port of the algorithm.
-         const e = [b1[0] - a1[0], b1[1] - a1[1]];
-         let kross    = crossProduct(va, vb);
-         let sqrKross = kross * kross;
-         const sqrLenA  = dotProduct(va, va);
-         //const sqrLenB  = dotProduct(vb, vb);
+             if (d.newStatus) {
+               payload.status = d.newStatus;
+               payload.text = 'status changed';
+             } // Comment take place of default text
 
-         // Check for line intersection. This works because of the properties of the
-         // cross product -- specifically, two vectors are parallel if and only if the
-         // cross product is the 0 vector. The full calculation involves relative error
-         // to account for possible very small line segments. See Schneider & Eberly
-         // for details.
-         if (sqrKross > 0/* EPS * sqrLenB * sqLenA */) {
-           // If they're not parallel, then (because these are line segments) they
-           // still might not actually intersect. This code checks that the
-           // intersection point of the lines is actually on both line segments.
-           const s = crossProduct(e, vb) / kross;
-           if (s < 0 || s > 1) {
-             // not on line segment a
-             return null;
-           }
-           const t = crossProduct(e, va) / kross;
-           if (t < 0 || t > 1) {
-             // not on line segment b
-             return null;
-           }
-           if (s === 0 || s === 1) {
-             // on an endpoint of line segment a
-             return noEndpointTouch ? null : [toPoint(a1, s, va)];
-           }
-           if (t === 0 || t === 1) {
-             // on an endpoint of line segment b
-             return noEndpointTouch ? null : [toPoint(b1, t, vb)];
-           }
-           return [toPoint(a1, s, va)];
-         }
 
-         // If we've reached this point, then the lines are either parallel or the
-         // same, but the segments could overlap partially or fully, or not at all.
-         // So we need to find the overlap, if any. To do that, we can use e, which is
-         // the (vector) difference between the two initial points. If this is parallel
-         // with the line itself, then the two lines are the same line, and there will
-         // be overlap.
-         //const sqrLenE = dotProduct(e, e);
-         kross = crossProduct(e, va);
-         sqrKross = kross * kross;
+             if (d.newComment) {
+               payload.text = d.newComment;
+             }
 
-         if (sqrKross > 0 /* EPS * sqLenB * sqLenE */) {
-         // Lines are just parallel, not the same. No overlap.
-           return null;
-         }
+             var controller = new AbortController();
+             _cache$1.inflightPost[d.id] = controller;
+             var options = {
+               method: 'POST',
+               signal: controller.signal,
+               body: JSON.stringify(payload)
+             };
+             d3_json(url, options).then(function () {
+               delete _cache$1.inflightPost[d.id]; // Just a comment, update error in cache
+
+               if (!d.newStatus) {
+                 var now = new Date();
+                 var comments = d.comments ? d.comments : [];
+                 comments.push({
+                   username: payload.username,
+                   text: payload.text,
+                   timestamp: now.getTime() / 1000
+                 });
 
-         const sa = dotProduct(va, e) / sqrLenA;
-         const sb = sa + dotProduct(va, vb) / sqrLenA;
-         const smin = Math.min(sa, sb);
-         const smax = Math.max(sa, sb);
+                 _this3.replaceItem(d.update({
+                   comments: comments,
+                   newComment: undefined
+                 }));
+               } else {
+                 _this3.removeItem(d);
 
-         // this is, essentially, the FindIntersection acting on floats from
-         // Schneider & Eberly, just inlined into this function.
-         if (smin <= 1 && smax >= 0) {
+                 if (d.newStatus === 'SOLVED') {
+                   // Keep track of the number of issues closed per type to tag the changeset
+                   if (!(d.issueKey in _cache$1.closed)) {
+                     _cache$1.closed[d.issueKey] = 0;
+                   }
 
-           // overlap on an end point
-           if (smin === 1) {
-             return noEndpointTouch ? null : [toPoint(a1, smin > 0 ? smin : 0, va)];
-           }
+                   _cache$1.closed[d.issueKey] += 1;
+                 }
+               }
 
-           if (smax === 0) {
-             return noEndpointTouch ? null : [toPoint(a1, smax < 1 ? smax : 1, va)];
+               if (callback) callback(null, d);
+             })["catch"](function (err) {
+               delete _cache$1.inflightPost[d.id];
+               if (callback) callback(err.message);
+             });
            }
+         },
+         // Get all cached QAItems covering the viewport
+         getItems: function getItems(projection) {
+           var viewport = projection.clipExtent();
+           var min = [viewport[0][0], viewport[1][1]];
+           var max = [viewport[1][0], viewport[0][1]];
+           var bbox = geoExtent(projection.invert(min), projection.invert(max)).bbox();
+           return _cache$1.rtree.search(bbox).map(function (d) {
+             return d.data;
+           });
+         },
+         // Get a QAItem from cache
+         // NOTE: Don't change method name until UI v3 is merged
+         getError: function getError(id) {
+           return _cache$1.data[id];
+         },
+         // get the name of the icon to display for this item
+         getIcon: function getIcon(itemType) {
+           return _impOsmData.icons[itemType];
+         },
+         // Replace a single QAItem in the cache
+         replaceItem: function replaceItem(issue) {
+           if (!(issue instanceof QAItem) || !issue.id) return;
+           _cache$1.data[issue.id] = issue;
+           updateRtree$1(encodeIssueRtree$1(issue), true); // true = replace
 
-           if (noEndpointTouch && smin === 0 && smax === 1) return null;
-
-           // There's overlap on a segment -- two points of intersection. Return both.
-           return [
-             toPoint(a1, smin > 0 ? smin : 0, va),
-             toPoint(a1, smax < 1 ? smax : 1, va)
-           ];
+           return issue;
+         },
+         // Remove a single QAItem from the cache
+         removeItem: function removeItem(issue) {
+           if (!(issue instanceof QAItem) || !issue.id) return;
+           delete _cache$1.data[issue.id];
+           updateRtree$1(encodeIssueRtree$1(issue), false); // false = remove
+         },
+         // Used to populate `closed:improveosm:*` changeset tags
+         getClosedCounts: function getClosedCounts() {
+           return _cache$1.closed;
          }
+       };
 
-         return null;
-       }
-
-       /**
-        * @param  {SweepEvent} se1
-        * @param  {SweepEvent} se2
-        * @param  {Queue}      queue
-        * @return {Number}
-        */
-       function possibleIntersection (se1, se2, queue) {
-         // that disallows self-intersecting polygons,
-         // did cost us half a day, so I'll leave it
-         // out of respect
-         // if (se1.isSubject === se2.isSubject) return;
-         const inter = intersection(
-           se1.point, se1.otherEvent.point,
-           se2.point, se2.otherEvent.point
-         );
+       var quot = /"/g;
 
-         const nintersections = inter ? inter.length : 0;
-         if (nintersections === 0) return 0; // no intersection
+       // B.2.3.2.1 CreateHTML(string, tag, attribute, value)
+       // https://tc39.github.io/ecma262/#sec-createhtml
+       var createHtml = function (string, tag, attribute, value) {
+         var S = String(requireObjectCoercible(string));
+         var p1 = '<' + tag;
+         if (attribute !== '') p1 += ' ' + attribute + '="' + String(value).replace(quot, '&quot;') + '"';
+         return p1 + '>' + S + '</' + tag + '>';
+       };
 
-         // the line segments intersect at an endpoint of both line segments
-         if ((nintersections === 1) &&
-             (equals(se1.point, se2.point) ||
-              equals(se1.otherEvent.point, se2.otherEvent.point))) {
-           return 0;
-         }
+       // check the existence of a method, lowercase
+       // of a tag and escaping quotes in arguments
+       var stringHtmlForced = function (METHOD_NAME) {
+         return fails(function () {
+           var test = ''[METHOD_NAME]('"');
+           return test !== test.toLowerCase() || test.split('"').length > 3;
+         });
+       };
 
-         if (nintersections === 2 && se1.isSubject === se2.isSubject) {
-           // if(se1.contourId === se2.contourId){
-           // console.warn('Edges of the same polygon overlap',
-           //   se1.point, se1.otherEvent.point, se2.point, se2.otherEvent.point);
-           // }
-           //throw new Error('Edges of the same polygon overlap');
-           return 0;
+       // `String.prototype.link` method
+       // https://tc39.github.io/ecma262/#sec-string.prototype.link
+       _export({ target: 'String', proto: true, forced: stringHtmlForced('link') }, {
+         link: function link(url) {
+           return createHtml(this, 'a', 'href', url);
          }
+       });
 
-         // The line segments associated to se1 and se2 intersect
-         if (nintersections === 1) {
-
-           // if the intersection point is not an endpoint of se1
-           if (!equals(se1.point, inter[0]) && !equals(se1.otherEvent.point, inter[0])) {
-             divideSegment(se1, inter[0], queue);
-           }
+       var getOwnPropertyDescriptor$4 = objectGetOwnPropertyDescriptor.f;
 
-           // if the intersection point is not an endpoint of se2
-           if (!equals(se2.point, inter[0]) && !equals(se2.otherEvent.point, inter[0])) {
-             divideSegment(se2, inter[0], queue);
-           }
-           return 1;
-         }
 
-         // The line segments associated to se1 and se2 overlap
-         const events        = [];
-         let leftCoincide  = false;
-         let rightCoincide = false;
 
-         if (equals(se1.point, se2.point)) {
-           leftCoincide = true; // linked
-         } else if (compareEvents(se1, se2) === 1) {
-           events.push(se2, se1);
-         } else {
-           events.push(se1, se2);
-         }
 
-         if (equals(se1.otherEvent.point, se2.otherEvent.point)) {
-           rightCoincide = true;
-         } else if (compareEvents(se1.otherEvent, se2.otherEvent) === 1) {
-           events.push(se2.otherEvent, se1.otherEvent);
-         } else {
-           events.push(se1.otherEvent, se2.otherEvent);
-         }
 
-         if ((leftCoincide && rightCoincide) || leftCoincide) {
-           // both line segments are equal or share the left endpoint
-           se2.type = NON_CONTRIBUTING;
-           se1.type = (se2.inOut === se1.inOut)
-             ? SAME_TRANSITION : DIFFERENT_TRANSITION;
 
-           if (leftCoincide && !rightCoincide) {
-             // honestly no idea, but changing events selection from [2, 1]
-             // to [0, 1] fixes the overlapping self-intersecting polygons issue
-             divideSegment(events[1].otherEvent, events[0].point, queue);
-           }
-           return 2;
-         }
+       var nativeEndsWith = ''.endsWith;
+       var min$8 = Math.min;
 
-         // the line segments share the right endpoint
-         if (rightCoincide) {
-           divideSegment(events[0], events[1].point, queue);
-           return 3;
-         }
+       var CORRECT_IS_REGEXP_LOGIC = correctIsRegexpLogic('endsWith');
+       // https://github.com/zloirock/core-js/pull/702
+       var MDN_POLYFILL_BUG =  !CORRECT_IS_REGEXP_LOGIC && !!function () {
+         var descriptor = getOwnPropertyDescriptor$4(String.prototype, 'endsWith');
+         return descriptor && !descriptor.writable;
+       }();
 
-         // no line segment includes totally the other one
-         if (events[0] !== events[3].otherEvent) {
-           divideSegment(events[0], events[1].point, queue);
-           divideSegment(events[1], events[2].point, queue);
-           return 3;
+       // `String.prototype.endsWith` method
+       // https://tc39.github.io/ecma262/#sec-string.prototype.endswith
+       _export({ target: 'String', proto: true, forced: !MDN_POLYFILL_BUG && !CORRECT_IS_REGEXP_LOGIC }, {
+         endsWith: function endsWith(searchString /* , endPosition = @length */) {
+           var that = String(requireObjectCoercible(this));
+           notARegexp(searchString);
+           var endPosition = arguments.length > 1 ? arguments[1] : undefined;
+           var len = toLength(that.length);
+           var end = endPosition === undefined ? len : min$8(toLength(endPosition), len);
+           var search = String(searchString);
+           return nativeEndsWith
+             ? nativeEndsWith.call(that, search, end)
+             : that.slice(end - search.length, end) === search;
          }
+       });
 
-         // one line segment includes the other one
-         divideSegment(events[0], events[1].point, queue);
-         divideSegment(events[3].otherEvent, events[2].point, queue);
+       var getOwnPropertyDescriptor$5 = objectGetOwnPropertyDescriptor.f;
 
-         return 3;
-       }
 
-       /**
-        * @param  {SweepEvent} le1
-        * @param  {SweepEvent} le2
-        * @return {Number}
-        */
-       function compareSegments(le1, le2) {
-         if (le1 === le2) return 0;
 
-         // Segments are not collinear
-         if (signedArea(le1.point, le1.otherEvent.point, le2.point) !== 0 ||
-           signedArea(le1.point, le1.otherEvent.point, le2.otherEvent.point) !== 0) {
 
-           // If they share their left endpoint use the right endpoint to sort
-           if (equals(le1.point, le2.point)) return le1.isBelow(le2.otherEvent.point) ? -1 : 1;
 
-           // Different left endpoint: use the left endpoint to sort
-           if (le1.point[0] === le2.point[0]) return le1.point[1] < le2.point[1] ? -1 : 1;
 
-           // has the line segment associated to e1 been inserted
-           // into S after the line segment associated to e2 ?
-           if (compareEvents(le1, le2) === 1) return le2.isAbove(le1.point) ? -1 : 1;
+       var nativeStartsWith = ''.startsWith;
+       var min$9 = Math.min;
 
-           // The line segment associated to e2 has been inserted
-           // into S after the line segment associated to e1
-           return le1.isBelow(le2.point) ? -1 : 1;
-         }
+       var CORRECT_IS_REGEXP_LOGIC$1 = correctIsRegexpLogic('startsWith');
+       // https://github.com/zloirock/core-js/pull/702
+       var MDN_POLYFILL_BUG$1 =  !CORRECT_IS_REGEXP_LOGIC$1 && !!function () {
+         var descriptor = getOwnPropertyDescriptor$5(String.prototype, 'startsWith');
+         return descriptor && !descriptor.writable;
+       }();
 
-         if (le1.isSubject === le2.isSubject) { // same polygon
-           let p1 = le1.point, p2 = le2.point;
-           if (p1[0] === p2[0] && p1[1] === p2[1]/*equals(le1.point, le2.point)*/) {
-             p1 = le1.otherEvent.point; p2 = le2.otherEvent.point;
-             if (p1[0] === p2[0] && p1[1] === p2[1]) return 0;
-             else return le1.contourId > le2.contourId ? 1 : -1;
-           }
-         } else { // Segments are collinear, but belong to separate polygons
-           return le1.isSubject ? -1 : 1;
+       // `String.prototype.startsWith` method
+       // https://tc39.github.io/ecma262/#sec-string.prototype.startswith
+       _export({ target: 'String', proto: true, forced: !MDN_POLYFILL_BUG$1 && !CORRECT_IS_REGEXP_LOGIC$1 }, {
+         startsWith: function startsWith(searchString /* , position = 0 */) {
+           var that = String(requireObjectCoercible(this));
+           notARegexp(searchString);
+           var index = toLength(min$9(arguments.length > 1 ? arguments[1] : undefined, that.length));
+           var search = String(searchString);
+           return nativeStartsWith
+             ? nativeStartsWith.call(that, search, index)
+             : that.slice(index, index + search.length) === search;
          }
+       });
 
-         return compareEvents(le1, le2) === 1 ? 1 : -1;
-       }
+       var $trimEnd = stringTrim.end;
 
-       function subdivide(eventQueue, subject, clipping, sbbox, cbbox, operation) {
-         const sweepLine = new SplayTree(compareSegments);
-         const sortedEvents = [];
 
-         const rightbound = Math.min(sbbox[2], cbbox[2]);
+       var FORCED$e = stringTrimForced('trimEnd');
 
-         let prev, next, begin;
+       var trimEnd = FORCED$e ? function trimEnd() {
+         return $trimEnd(this);
+       } : ''.trimEnd;
 
-         while (eventQueue.length !== 0) {
-           let event = eventQueue.pop();
-           sortedEvents.push(event);
+       // `String.prototype.{ trimEnd, trimRight }` methods
+       // https://github.com/tc39/ecmascript-string-left-right-trim
+       _export({ target: 'String', proto: true, forced: FORCED$e }, {
+         trimEnd: trimEnd,
+         trimRight: trimEnd
+       });
 
-           // optimization by bboxes for intersection and difference goes here
-           if ((operation === INTERSECTION && event.point[0] > rightbound) ||
-               (operation === DIFFERENCE   && event.point[0] > sbbox[2])) {
-             break;
-           }
+       var defaults = createCommonjsModule(function (module) {
+         function getDefaults() {
+           return {
+             baseUrl: null,
+             breaks: false,
+             gfm: true,
+             headerIds: true,
+             headerPrefix: '',
+             highlight: null,
+             langPrefix: 'language-',
+             mangle: true,
+             pedantic: false,
+             renderer: null,
+             sanitize: false,
+             sanitizer: null,
+             silent: false,
+             smartLists: false,
+             smartypants: false,
+             tokenizer: null,
+             walkTokens: null,
+             xhtml: false
+           };
+         }
+
+         function changeDefaults(newDefaults) {
+           module.exports.defaults = newDefaults;
+         }
+
+         module.exports = {
+           defaults: getDefaults(),
+           getDefaults: getDefaults,
+           changeDefaults: changeDefaults
+         };
+       });
 
-           if (event.left) {
-             next  = prev = sweepLine.insert(event);
-             begin = sweepLine.minNode();
+       /**
+        * Helpers
+        */
+       var escapeTest = /[&<>"']/;
+       var escapeReplace = /[&<>"']/g;
+       var escapeTestNoEncode = /[<>"']|&(?!#?\w+;)/;
+       var escapeReplaceNoEncode = /[<>"']|&(?!#?\w+;)/g;
+       var escapeReplacements = {
+         '&': '&amp;',
+         '<': '&lt;',
+         '>': '&gt;',
+         '"': '&quot;',
+         "'": '&#39;'
+       };
 
-             if (prev !== begin) prev = sweepLine.prev(prev);
-             else                prev = null;
+       var getEscapeReplacement = function getEscapeReplacement(ch) {
+         return escapeReplacements[ch];
+       };
 
-             next = sweepLine.next(next);
+       function escape$1(html, encode) {
+         if (encode) {
+           if (escapeTest.test(html)) {
+             return html.replace(escapeReplace, getEscapeReplacement);
+           }
+         } else {
+           if (escapeTestNoEncode.test(html)) {
+             return html.replace(escapeReplaceNoEncode, getEscapeReplacement);
+           }
+         }
 
-             const prevEvent = prev ? prev.key : null;
-             let prevprevEvent;
-             computeFields(event, prevEvent, operation);
-             if (next) {
-               if (possibleIntersection(event, next.key, eventQueue) === 2) {
-                 computeFields(event, prevEvent, operation);
-                 computeFields(event, next.key, operation);
-               }
-             }
+         return html;
+       }
 
-             if (prev) {
-               if (possibleIntersection(prev.key, event, eventQueue) === 2) {
-                 let prevprev = prev;
-                 if (prevprev !== begin) prevprev = sweepLine.prev(prevprev);
-                 else                    prevprev = null;
+       var unescapeTest = /&(#(?:\d+)|(?:#x[0-9A-Fa-f]+)|(?:\w+));?/ig;
 
-                 prevprevEvent = prevprev ? prevprev.key : null;
-                 computeFields(prevEvent, prevprevEvent, operation);
-                 computeFields(event,     prevEvent,     operation);
-               }
-             }
-           } else {
-             event = event.otherEvent;
-             next = prev = sweepLine.find(event);
+       function unescape$1(html) {
+         // explicitly match decimal, hex, and named HTML entities
+         return html.replace(unescapeTest, function (_, n) {
+           n = n.toLowerCase();
+           if (n === 'colon') return ':';
 
-             if (prev && next) {
+           if (n.charAt(0) === '#') {
+             return n.charAt(1) === 'x' ? String.fromCharCode(parseInt(n.substring(2), 16)) : String.fromCharCode(+n.substring(1));
+           }
 
-               if (prev !== begin) prev = sweepLine.prev(prev);
-               else                prev = null;
+           return '';
+         });
+       }
 
-               next = sweepLine.next(next);
-               sweepLine.remove(event);
+       var caret = /(^|[^\[])\^/g;
 
-               if (next && prev) {
-                 possibleIntersection(prev.key, next.key, eventQueue);
-               }
-             }
+       function edit(regex, opt) {
+         regex = regex.source || regex;
+         opt = opt || '';
+         var obj = {
+           replace: function replace(name, val) {
+             val = val.source || val;
+             val = val.replace(caret, '$1');
+             regex = regex.replace(name, val);
+             return obj;
+           },
+           getRegex: function getRegex() {
+             return new RegExp(regex, opt);
            }
-         }
-         return sortedEvents;
+         };
+         return obj;
        }
 
-       class Contour {
-
-         /**
-          * Contour
-          *
-          * @class {Contour}
-          */
-         constructor() {
-           this.points = [];
-           this.holeIds = [];
-           this.holeOf = null;
-           this.depth = null;
-         }
-
-         isExterior() {
-           return this.holeOf == null;
-         }
+       var nonWordAndColonTest = /[^\w:]/g;
+       var originIndependentUrl = /^$|^[a-z][a-z0-9+.-]*:|^[?#]/i;
 
-       }
+       function cleanUrl(sanitize, base, href) {
+         if (sanitize) {
+           var prot;
 
-       /**
-        * @param  {Array.<SweepEvent>} sortedEvents
-        * @return {Array.<SweepEvent>}
-        */
-       function orderEvents(sortedEvents) {
-         let event, i, len, tmp;
-         const resultEvents = [];
-         for (i = 0, len = sortedEvents.length; i < len; i++) {
-           event = sortedEvents[i];
-           if ((event.left && event.inResult) ||
-             (!event.left && event.otherEvent.inResult)) {
-             resultEvents.push(event);
+           try {
+             prot = decodeURIComponent(unescape$1(href)).replace(nonWordAndColonTest, '').toLowerCase();
+           } catch (e) {
+             return null;
            }
-         }
-         // Due to overlapping edges the resultEvents array can be not wholly sorted
-         let sorted = false;
-         while (!sorted) {
-           sorted = true;
-           for (i = 0, len = resultEvents.length; i < len; i++) {
-             if ((i + 1) < len &&
-               compareEvents(resultEvents[i], resultEvents[i + 1]) === 1) {
-               tmp = resultEvents[i];
-               resultEvents[i] = resultEvents[i + 1];
-               resultEvents[i + 1] = tmp;
-               sorted = false;
-             }
+
+           if (prot.indexOf('javascript:') === 0 || prot.indexOf('vbscript:') === 0 || prot.indexOf('data:') === 0) {
+             return null;
            }
          }
 
+         if (base && !originIndependentUrl.test(href)) {
+           href = resolveUrl(base, href);
+         }
 
-         for (i = 0, len = resultEvents.length; i < len; i++) {
-           event = resultEvents[i];
-           event.otherPos = i;
+         try {
+           href = encodeURI(href).replace(/%25/g, '%');
+         } catch (e) {
+           return null;
          }
 
-         // imagine, the right event is found in the beginning of the queue,
-         // when his left counterpart is not marked yet
-         for (i = 0, len = resultEvents.length; i < len; i++) {
-           event = resultEvents[i];
-           if (!event.left) {
-             tmp = event.otherPos;
-             event.otherPos = event.otherEvent.otherPos;
-             event.otherEvent.otherPos = tmp;
+         return href;
+       }
+
+       var baseUrls = {};
+       var justDomain = /^[^:]+:\/*[^/]*$/;
+       var protocol = /^([^:]+:)[\s\S]*$/;
+       var domain = /^([^:]+:\/*[^/]*)[\s\S]*$/;
+
+       function resolveUrl(base, href) {
+         if (!baseUrls[' ' + base]) {
+           // we can ignore everything in base after the last slash of its path component,
+           // but we might need to add _that_
+           // https://tools.ietf.org/html/rfc3986#section-3
+           if (justDomain.test(base)) {
+             baseUrls[' ' + base] = base + '/';
+           } else {
+             baseUrls[' ' + base] = rtrim$1(base, '/', true);
            }
          }
 
-         return resultEvents;
-       }
-
-
-       /**
-        * @param  {Number} pos
-        * @param  {Array.<SweepEvent>} resultEvents
-        * @param  {Object>}    processed
-        * @return {Number}
-        */
-       function nextPos(pos, resultEvents, processed, origPos) {
-         let newPos = pos + 1,
-             p = resultEvents[pos].point,
-             p1;
-         const length = resultEvents.length;
+         base = baseUrls[' ' + base];
+         var relativeBase = base.indexOf(':') === -1;
 
-         if (newPos < length)
-           p1 = resultEvents[newPos].point;
+         if (href.substring(0, 2) === '//') {
+           if (relativeBase) {
+             return href;
+           }
 
-         while (newPos < length && p1[0] === p[0] && p1[1] === p[1]) {
-           if (!processed[newPos]) {
-             return newPos;
-           } else   {
-             newPos++;
+           return base.replace(protocol, '$1') + href;
+         } else if (href.charAt(0) === '/') {
+           if (relativeBase) {
+             return href;
            }
-           p1 = resultEvents[newPos].point;
+
+           return base.replace(domain, '$1') + href;
+         } else {
+           return base + href;
          }
+       }
 
-         newPos = pos - 1;
+       var noopTest = {
+         exec: function noopTest() {}
+       };
 
-         while (processed[newPos] && newPos > origPos) {
-           newPos--;
+       function merge$1(obj) {
+         var i = 1,
+             target,
+             key;
+
+         for (; i < arguments.length; i++) {
+           target = arguments[i];
+
+           for (key in target) {
+             if (Object.prototype.hasOwnProperty.call(target, key)) {
+               obj[key] = target[key];
+             }
+           }
          }
 
-         return newPos;
+         return obj;
        }
 
+       function splitCells(tableRow, count) {
+         // ensure that every cell-delimiting pipe has a space
+         // before it to distinguish it from an escaped pipe
+         var row = tableRow.replace(/\|/g, function (match, offset, str) {
+           var escaped = false,
+               curr = offset;
 
-       function initializeContourFromContext(event, contours, contourId) {
-         const contour = new Contour();
-         if (event.prevInResult != null) {
-           const prevInResult = event.prevInResult;
-           // Note that it is valid to query the "previous in result" for its output contour id,
-           // because we must have already processed it (i.e., assigned an output contour id)
-           // in an earlier iteration, otherwise it wouldn't be possible that it is "previous in
-           // result".
-           const lowerContourId = prevInResult.outputContourId;
-           const lowerResultTransition = prevInResult.resultTransition;
-           if (lowerResultTransition > 0) {
-             // We are inside. Now we have to check if the thing below us is another hole or
-             // an exterior contour.
-             const lowerContour = contours[lowerContourId];
-             if (lowerContour.holeOf != null) {
-               // The lower contour is a hole => Connect the new contour as a hole to its parent,
-               // and use same depth.
-               const parentContourId = lowerContour.holeOf;
-               contours[parentContourId].holeIds.push(contourId);
-               contour.holeOf = parentContourId;
-               contour.depth = contours[lowerContourId].depth;
-             } else {
-               // The lower contour is an exterior contour => Connect the new contour as a hole,
-               // and increment depth.
-               contours[lowerContourId].holeIds.push(contourId);
-               contour.holeOf = lowerContourId;
-               contour.depth = contours[lowerContourId].depth + 1;
-             }
+           while (--curr >= 0 && str[curr] === '\\') {
+             escaped = !escaped;
+           }
+
+           if (escaped) {
+             // odd number of slashes means | is escaped
+             // so we leave it alone
+             return '|';
            } else {
-             // We are outside => this contour is an exterior contour of same depth.
-             contour.holeOf = null;
-             contour.depth = contours[lowerContourId].depth;
+             // add space before unescaped |
+             return ' |';
            }
+         }),
+             cells = row.split(/ \|/);
+         var i = 0;
+
+         if (cells.length > count) {
+           cells.splice(count);
          } else {
-           // There is no lower/previous contour => this contour is an exterior contour of depth 0.
-           contour.holeOf = null;
-           contour.depth = 0;
+           while (cells.length < count) {
+             cells.push('');
+           }
          }
-         return contour;
-       }
 
-       /**
-        * @param  {Array.<SweepEvent>} sortedEvents
-        * @return {Array.<*>} polygons
-        */
-       function connectEdges(sortedEvents) {
-         let i, len;
-         const resultEvents = orderEvents(sortedEvents);
+         for (; i < cells.length; i++) {
+           // leading or trailing whitespace is ignored per the gfm spec
+           cells[i] = cells[i].trim().replace(/\\\|/g, '|');
+         }
 
-         // "false"-filled array
-         const processed = {};
-         const contours = [];
+         return cells;
+       } // Remove trailing 'c's. Equivalent to str.replace(/c*$/, '').
+       // /c*$/ is vulnerable to REDOS.
+       // invert: Remove suffix of non-c chars instead. Default falsey.
 
-         for (i = 0, len = resultEvents.length; i < len; i++) {
 
-           if (processed[i]) {
-             continue;
-           }
+       function rtrim$1(str, c, invert) {
+         var l = str.length;
 
-           const contourId = contours.length;
-           const contour = initializeContourFromContext(resultEvents[i], contours, contourId);
+         if (l === 0) {
+           return '';
+         } // Length of suffix matching the invert condition.
 
-           // Helper function that combines marking an event as processed with assigning its output contour ID
-           const markAsProcessed = (pos) => {
-             processed[pos] = true;
-             resultEvents[pos].outputContourId = contourId;
-           };
 
-           let pos = i;
-           let origPos = i;
+         var suffLen = 0; // Step left until we fail to match the invert condition.
 
-           const initial = resultEvents[i].point;
-           contour.points.push(initial);
+         while (suffLen < l) {
+           var currChar = str.charAt(l - suffLen - 1);
 
-           /* eslint no-constant-condition: "off" */
-           while (true) {
-             markAsProcessed(pos);
+           if (currChar === c && !invert) {
+             suffLen++;
+           } else if (currChar !== c && invert) {
+             suffLen++;
+           } else {
+             break;
+           }
+         }
 
-             pos = resultEvents[pos].otherPos;
+         return str.substr(0, l - suffLen);
+       }
 
-             markAsProcessed(pos);
-             contour.points.push(resultEvents[pos].point);
+       function findClosingBracket(str, b) {
+         if (str.indexOf(b[1]) === -1) {
+           return -1;
+         }
 
-             pos = nextPos(pos, resultEvents, processed, origPos);
+         var l = str.length;
+         var level = 0,
+             i = 0;
 
-             if (pos == origPos) {
-               break;
+         for (; i < l; i++) {
+           if (str[i] === '\\') {
+             i++;
+           } else if (str[i] === b[0]) {
+             level++;
+           } else if (str[i] === b[1]) {
+             level--;
+
+             if (level < 0) {
+               return i;
              }
            }
-
-           contours.push(contour);
          }
 
-         return contours;
+         return -1;
        }
 
-       var tinyqueue = TinyQueue;
-       var _default$1 = TinyQueue;
+       function checkSanitizeDeprecation(opt) {
+         if (opt && opt.sanitize && !opt.silent) {
+           console.warn('marked(): sanitize and sanitizer parameters are deprecated since version 0.7.0, should not be used and will be removed in the future. Read more here: https://marked.js.org/#/USING_ADVANCED.md#options');
+         }
+       } // copied from https://stackoverflow.com/a/5450113/806777
 
-       function TinyQueue(data, compare) {
-           if (!(this instanceof TinyQueue)) return new TinyQueue(data, compare);
 
-           this.data = data || [];
-           this.length = this.data.length;
-           this.compare = compare || defaultCompare$1;
+       function repeatString(pattern, count) {
+         if (count < 1) {
+           return '';
+         }
+
+         var result = '';
 
-           if (this.length > 0) {
-               for (var i = (this.length >> 1) - 1; i >= 0; i--) this._down(i);
+         while (count > 1) {
+           if (count & 1) {
+             result += pattern;
            }
-       }
 
-       function defaultCompare$1(a, b) {
-           return a < b ? -1 : a > b ? 1 : 0;
+           count >>= 1;
+           pattern += pattern;
+         }
+
+         return result + pattern;
        }
 
-       TinyQueue.prototype = {
+       var helpers = {
+         escape: escape$1,
+         unescape: unescape$1,
+         edit: edit,
+         cleanUrl: cleanUrl,
+         resolveUrl: resolveUrl,
+         noopTest: noopTest,
+         merge: merge$1,
+         splitCells: splitCells,
+         rtrim: rtrim$1,
+         findClosingBracket: findClosingBracket,
+         checkSanitizeDeprecation: checkSanitizeDeprecation,
+         repeatString: repeatString
+       };
 
-           push: function (item) {
-               this.data.push(item);
-               this.length++;
-               this._up(this.length - 1);
-           },
+       var defaults$1 = defaults.defaults;
+       var rtrim$2 = helpers.rtrim,
+           splitCells$1 = helpers.splitCells,
+           _escape = helpers.escape,
+           findClosingBracket$1 = helpers.findClosingBracket;
+
+       function outputLink(cap, link, raw) {
+         var href = link.href;
+         var title = link.title ? _escape(link.title) : null;
+         var text = cap[1].replace(/\\([\[\]])/g, '$1');
 
-           pop: function () {
-               if (this.length === 0) return undefined;
+         if (cap[0].charAt(0) !== '!') {
+           return {
+             type: 'link',
+             raw: raw,
+             href: href,
+             title: title,
+             text: text
+           };
+         } else {
+           return {
+             type: 'image',
+             raw: raw,
+             href: href,
+             title: title,
+             text: _escape(text)
+           };
+         }
+       }
 
-               var top = this.data[0];
-               this.length--;
+       function indentCodeCompensation(raw, text) {
+         var matchIndentToCode = raw.match(/^(\s+)(?:```)/);
 
-               if (this.length > 0) {
-                   this.data[0] = this.data[this.length];
-                   this._down(0);
-               }
-               this.data.pop();
+         if (matchIndentToCode === null) {
+           return text;
+         }
 
-               return top;
-           },
+         var indentToCode = matchIndentToCode[1];
+         return text.split('\n').map(function (node) {
+           var matchIndentInNode = node.match(/^\s+/);
 
-           peek: function () {
-               return this.data[0];
-           },
+           if (matchIndentInNode === null) {
+             return node;
+           }
 
-           _up: function (pos) {
-               var data = this.data;
-               var compare = this.compare;
-               var item = data[pos];
+           var _matchIndentInNode = _slicedToArray(matchIndentInNode, 1),
+               indentInNode = _matchIndentInNode[0];
 
-               while (pos > 0) {
-                   var parent = (pos - 1) >> 1;
-                   var current = data[parent];
-                   if (compare(item, current) >= 0) break;
-                   data[pos] = current;
-                   pos = parent;
-               }
+           if (indentInNode.length >= indentToCode.length) {
+             return node.slice(indentToCode.length);
+           }
 
-               data[pos] = item;
-           },
+           return node;
+         }).join('\n');
+       }
+       /**
+        * Tokenizer
+        */
 
-           _down: function (pos) {
-               var data = this.data;
-               var compare = this.compare;
-               var halfLength = this.length >> 1;
-               var item = data[pos];
 
-               while (pos < halfLength) {
-                   var left = (pos << 1) + 1;
-                   var right = left + 1;
-                   var best = data[left];
+       var Tokenizer_1 = /*#__PURE__*/function () {
+         function Tokenizer(options) {
+           _classCallCheck(this, Tokenizer);
 
-                   if (right < this.length && compare(data[right], best) < 0) {
-                       left = right;
-                       best = data[right];
-                   }
-                   if (compare(best, item) >= 0) break;
+           this.options = options || defaults$1;
+         }
 
-                   data[pos] = best;
-                   pos = left;
+         _createClass(Tokenizer, [{
+           key: "space",
+           value: function space(src) {
+             var cap = this.rules.block.newline.exec(src);
+
+             if (cap) {
+               if (cap[0].length > 1) {
+                 return {
+                   type: 'space',
+                   raw: cap[0]
+                 };
                }
 
-               data[pos] = item;
+               return {
+                 raw: '\n'
+               };
+             }
            }
-       };
-       tinyqueue.default = _default$1;
-
-       const max$2 = Math.max;
-       const min = Math.min;
-
-       let contourId = 0;
+         }, {
+           key: "code",
+           value: function code(src, tokens) {
+             var cap = this.rules.block.code.exec(src);
 
+             if (cap) {
+               var lastToken = tokens[tokens.length - 1]; // An indented code block cannot interrupt a paragraph.
 
-       function processPolygon(contourOrHole, isSubject, depth, Q, bbox, isExteriorRing) {
-         let i, len, s1, s2, e1, e2;
-         for (i = 0, len = contourOrHole.length - 1; i < len; i++) {
-           s1 = contourOrHole[i];
-           s2 = contourOrHole[i + 1];
-           e1 = new SweepEvent(s1, false, undefined, isSubject);
-           e2 = new SweepEvent(s2, false, e1,        isSubject);
-           e1.otherEvent = e2;
+               if (lastToken && lastToken.type === 'paragraph') {
+                 return {
+                   raw: cap[0],
+                   text: cap[0].trimRight()
+                 };
+               }
 
-           if (s1[0] === s2[0] && s1[1] === s2[1]) {
-             continue; // skip collapsed edges, or it breaks
+               var text = cap[0].replace(/^ {4}/gm, '');
+               return {
+                 type: 'code',
+                 raw: cap[0],
+                 codeBlockStyle: 'indented',
+                 text: !this.options.pedantic ? rtrim$2(text, '\n') : text
+               };
+             }
            }
+         }, {
+           key: "fences",
+           value: function fences(src) {
+             var cap = this.rules.block.fences.exec(src);
 
-           e1.contourId = e2.contourId = depth;
-           if (!isExteriorRing) {
-             e1.isExteriorRing = false;
-             e2.isExteriorRing = false;
+             if (cap) {
+               var raw = cap[0];
+               var text = indentCodeCompensation(raw, cap[3] || '');
+               return {
+                 type: 'code',
+                 raw: raw,
+                 lang: cap[2] ? cap[2].trim() : cap[2],
+                 text: text
+               };
+             }
            }
-           if (compareEvents(e1, e2) > 0) {
-             e2.left = true;
-           } else {
-             e1.left = true;
+         }, {
+           key: "heading",
+           value: function heading(src) {
+             var cap = this.rules.block.heading.exec(src);
+
+             if (cap) {
+               return {
+                 type: 'heading',
+                 raw: cap[0],
+                 depth: cap[1].length,
+                 text: cap[2]
+               };
+             }
            }
+         }, {
+           key: "nptable",
+           value: function nptable(src) {
+             var cap = this.rules.block.nptable.exec(src);
+
+             if (cap) {
+               var item = {
+                 type: 'table',
+                 header: splitCells$1(cap[1].replace(/^ *| *\| *$/g, '')),
+                 align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
+                 cells: cap[3] ? cap[3].replace(/\n$/, '').split('\n') : [],
+                 raw: cap[0]
+               };
 
-           const x = s1[0], y = s1[1];
-           bbox[0] = min(bbox[0], x);
-           bbox[1] = min(bbox[1], y);
-           bbox[2] = max$2(bbox[2], x);
-           bbox[3] = max$2(bbox[3], y);
+               if (item.header.length === item.align.length) {
+                 var l = item.align.length;
+                 var i;
+
+                 for (i = 0; i < l; i++) {
+                   if (/^ *-+: *$/.test(item.align[i])) {
+                     item.align[i] = 'right';
+                   } else if (/^ *:-+: *$/.test(item.align[i])) {
+                     item.align[i] = 'center';
+                   } else if (/^ *:-+ *$/.test(item.align[i])) {
+                     item.align[i] = 'left';
+                   } else {
+                     item.align[i] = null;
+                   }
+                 }
 
-           // Pushing it so the queue is sorted from left to right,
-           // with object on the left having the highest priority.
-           Q.push(e1);
-           Q.push(e2);
-         }
-       }
+                 l = item.cells.length;
 
+                 for (i = 0; i < l; i++) {
+                   item.cells[i] = splitCells$1(item.cells[i], item.header.length);
+                 }
 
-       function fillQueue(subject, clipping, sbbox, cbbox, operation) {
-         const eventQueue = new tinyqueue(null, compareEvents);
-         let polygonSet, isExteriorRing, i, ii, j, jj; //, k, kk;
+                 return item;
+               }
+             }
+           }
+         }, {
+           key: "hr",
+           value: function hr(src) {
+             var cap = this.rules.block.hr.exec(src);
 
-         for (i = 0, ii = subject.length; i < ii; i++) {
-           polygonSet = subject[i];
-           for (j = 0, jj = polygonSet.length; j < jj; j++) {
-             isExteriorRing = j === 0;
-             if (isExteriorRing) contourId++;
-             processPolygon(polygonSet[j], true, contourId, eventQueue, sbbox, isExteriorRing);
+             if (cap) {
+               return {
+                 type: 'hr',
+                 raw: cap[0]
+               };
+             }
            }
-         }
+         }, {
+           key: "blockquote",
+           value: function blockquote(src) {
+             var cap = this.rules.block.blockquote.exec(src);
 
-         for (i = 0, ii = clipping.length; i < ii; i++) {
-           polygonSet = clipping[i];
-           for (j = 0, jj = polygonSet.length; j < jj; j++) {
-             isExteriorRing = j === 0;
-             if (operation === DIFFERENCE) isExteriorRing = false;
-             if (isExteriorRing) contourId++;
-             processPolygon(polygonSet[j], false, contourId, eventQueue, cbbox, isExteriorRing);
+             if (cap) {
+               var text = cap[0].replace(/^ *> ?/gm, '');
+               return {
+                 type: 'blockquote',
+                 raw: cap[0],
+                 text: text
+               };
+             }
            }
-         }
+         }, {
+           key: "list",
+           value: function list(src) {
+             var cap = this.rules.block.list.exec(src);
+
+             if (cap) {
+               var raw = cap[0];
+               var bull = cap[2];
+               var isordered = bull.length > 1;
+               var isparen = bull[bull.length - 1] === ')';
+               var list = {
+                 type: 'list',
+                 raw: raw,
+                 ordered: isordered,
+                 start: isordered ? +bull.slice(0, -1) : '',
+                 loose: false,
+                 items: []
+               }; // Get each top-level item.
+
+               var itemMatch = cap[0].match(this.rules.block.item);
+               var next = false,
+                   item,
+                   space,
+                   b,
+                   addBack,
+                   loose,
+                   istask,
+                   ischecked;
+               var l = itemMatch.length;
+
+               for (var i = 0; i < l; i++) {
+                 item = itemMatch[i];
+                 raw = item; // Remove the list item's bullet
+                 // so it is seen as the next token.
+
+                 space = item.length;
+                 item = item.replace(/^ *([*+-]|\d+[.)]) ?/, ''); // Outdent whatever the
+                 // list item contains. Hacky.
+
+                 if (~item.indexOf('\n ')) {
+                   space -= item.length;
+                   item = !this.options.pedantic ? item.replace(new RegExp('^ {1,' + space + '}', 'gm'), '') : item.replace(/^ {1,4}/gm, '');
+                 } // Determine whether the next list item belongs here.
+                 // Backpedal if it does not belong in this list.
+
+
+                 if (i !== l - 1) {
+                   b = this.rules.block.bullet.exec(itemMatch[i + 1])[0];
+
+                   if (isordered ? b.length === 1 || !isparen && b[b.length - 1] === ')' : b.length > 1 || this.options.smartLists && b !== bull) {
+                     addBack = itemMatch.slice(i + 1).join('\n');
+                     list.raw = list.raw.substring(0, list.raw.length - addBack.length);
+                     i = l - 1;
+                   }
+                 } // Determine whether item is loose or not.
+                 // Use: /(^|\n)(?! )[^\n]+\n\n(?!\s*$)/
+                 // for discount behavior.
+
+
+                 loose = next || /\n\n(?!\s*$)/.test(item);
+
+                 if (i !== l - 1) {
+                   next = item.charAt(item.length - 1) === '\n';
+                   if (!loose) loose = next;
+                 }
 
-         return eventQueue;
-       }
+                 if (loose) {
+                   list.loose = true;
+                 } // Check for task list items
 
-       const EMPTY = [];
 
+                 istask = /^\[[ xX]\] /.test(item);
+                 ischecked = undefined;
 
-       function trivialOperation(subject, clipping, operation) {
-         let result = null;
-         if (subject.length * clipping.length === 0) {
-           if        (operation === INTERSECTION) {
-             result = EMPTY;
-           } else if (operation === DIFFERENCE) {
-             result = subject;
-           } else if (operation === UNION ||
-                      operation === XOR) {
-             result = (subject.length === 0) ? clipping : subject;
+                 if (istask) {
+                   ischecked = item[1] !== ' ';
+                   item = item.replace(/^\[[ xX]\] +/, '');
+                 }
+
+                 list.items.push({
+                   type: 'list_item',
+                   raw: raw,
+                   task: istask,
+                   checked: ischecked,
+                   loose: loose,
+                   text: item
+                 });
+               }
+
+               return list;
+             }
            }
-         }
-         return result;
-       }
+         }, {
+           key: "html",
+           value: function html(src) {
+             var cap = this.rules.block.html.exec(src);
 
+             if (cap) {
+               return {
+                 type: this.options.sanitize ? 'paragraph' : 'html',
+                 raw: cap[0],
+                 pre: !this.options.sanitizer && (cap[1] === 'pre' || cap[1] === 'script' || cap[1] === 'style'),
+                 text: this.options.sanitize ? this.options.sanitizer ? this.options.sanitizer(cap[0]) : _escape(cap[0]) : cap[0]
+               };
+             }
+           }
+         }, {
+           key: "def",
+           value: function def(src) {
+             var cap = this.rules.block.def.exec(src);
 
-       function compareBBoxes(subject, clipping, sbbox, cbbox, operation) {
-         let result = null;
-         if (sbbox[0] > cbbox[2] ||
-             cbbox[0] > sbbox[2] ||
-             sbbox[1] > cbbox[3] ||
-             cbbox[1] > sbbox[3]) {
-           if        (operation === INTERSECTION) {
-             result = EMPTY;
-           } else if (operation === DIFFERENCE) {
-             result = subject;
-           } else if (operation === UNION ||
-                      operation === XOR) {
-             result = subject.concat(clipping);
+             if (cap) {
+               if (cap[3]) cap[3] = cap[3].substring(1, cap[3].length - 1);
+               var tag = cap[1].toLowerCase().replace(/\s+/g, ' ');
+               return {
+                 tag: tag,
+                 raw: cap[0],
+                 href: cap[2],
+                 title: cap[3]
+               };
+             }
            }
-         }
-         return result;
-       }
+         }, {
+           key: "table",
+           value: function table(src) {
+             var cap = this.rules.block.table.exec(src);
+
+             if (cap) {
+               var item = {
+                 type: 'table',
+                 header: splitCells$1(cap[1].replace(/^ *| *\| *$/g, '')),
+                 align: cap[2].replace(/^ *|\| *$/g, '').split(/ *\| */),
+                 cells: cap[3] ? cap[3].replace(/\n$/, '').split('\n') : []
+               };
 
+               if (item.header.length === item.align.length) {
+                 item.raw = cap[0];
+                 var l = item.align.length;
+                 var i;
+
+                 for (i = 0; i < l; i++) {
+                   if (/^ *-+: *$/.test(item.align[i])) {
+                     item.align[i] = 'right';
+                   } else if (/^ *:-+: *$/.test(item.align[i])) {
+                     item.align[i] = 'center';
+                   } else if (/^ *:-+ *$/.test(item.align[i])) {
+                     item.align[i] = 'left';
+                   } else {
+                     item.align[i] = null;
+                   }
+                 }
 
-       function boolean(subject, clipping, operation) {
-         if (typeof subject[0][0][0] === 'number') {
-           subject = [subject];
-         }
-         if (typeof clipping[0][0][0] === 'number') {
-           clipping = [clipping];
-         }
-         let trivial = trivialOperation(subject, clipping, operation);
-         if (trivial) {
-           return trivial === EMPTY ? null : trivial;
-         }
-         const sbbox = [Infinity, Infinity, -Infinity, -Infinity];
-         const cbbox = [Infinity, Infinity, -Infinity, -Infinity];
+                 l = item.cells.length;
 
-         // console.time('fill queue');
-         const eventQueue = fillQueue(subject, clipping, sbbox, cbbox, operation);
-         //console.timeEnd('fill queue');
+                 for (i = 0; i < l; i++) {
+                   item.cells[i] = splitCells$1(item.cells[i].replace(/^ *\| *| *\| *$/g, ''), item.header.length);
+                 }
 
-         trivial = compareBBoxes(subject, clipping, sbbox, cbbox, operation);
-         if (trivial) {
-           return trivial === EMPTY ? null : trivial;
-         }
-         // console.time('subdivide edges');
-         const sortedEvents = subdivide(eventQueue, subject, clipping, sbbox, cbbox, operation);
-         //console.timeEnd('subdivide edges');
+                 return item;
+               }
+             }
+           }
+         }, {
+           key: "lheading",
+           value: function lheading(src) {
+             var cap = this.rules.block.lheading.exec(src);
 
-         // console.time('connect vertices');
-         const contours = connectEdges(sortedEvents);
-         //console.timeEnd('connect vertices');
+             if (cap) {
+               return {
+                 type: 'heading',
+                 raw: cap[0],
+                 depth: cap[2].charAt(0) === '=' ? 1 : 2,
+                 text: cap[1]
+               };
+             }
+           }
+         }, {
+           key: "paragraph",
+           value: function paragraph(src) {
+             var cap = this.rules.block.paragraph.exec(src);
 
-         // Convert contours to polygons
-         const polygons = [];
-         for (let i = 0; i < contours.length; i++) {
-           let contour = contours[i];
-           if (contour.isExterior()) {
-             // The exterior ring goes first
-             let rings = [contour.points];
-             // Followed by holes if any
-             for (let j = 0; j < contour.holeIds.length; j++) {
-               let holeId = contour.holeIds[j];
-               rings.push(contours[holeId].points);
+             if (cap) {
+               return {
+                 type: 'paragraph',
+                 raw: cap[0],
+                 text: cap[1].charAt(cap[1].length - 1) === '\n' ? cap[1].slice(0, -1) : cap[1]
+               };
              }
-             polygons.push(rings);
            }
-         }
+         }, {
+           key: "text",
+           value: function text(src, tokens) {
+             var cap = this.rules.block.text.exec(src);
 
-         return polygons;
-       }
+             if (cap) {
+               var lastToken = tokens[tokens.length - 1];
 
-       function union (subject, clipping) {
-         return boolean(subject, clipping, UNION);
-       }
+               if (lastToken && lastToken.type === 'text') {
+                 return {
+                   raw: cap[0],
+                   text: cap[0]
+                 };
+               }
 
-       var read$6 = function (buffer, offset, isLE, mLen, nBytes) {
-         var e, m;
-         var eLen = (nBytes * 8) - mLen - 1;
-         var eMax = (1 << eLen) - 1;
-         var eBias = eMax >> 1;
-         var nBits = -7;
-         var i = isLE ? (nBytes - 1) : 0;
-         var d = isLE ? -1 : 1;
-         var s = buffer[offset + i];
+               return {
+                 type: 'text',
+                 raw: cap[0],
+                 text: cap[0]
+               };
+             }
+           }
+         }, {
+           key: "escape",
+           value: function escape(src) {
+             var cap = this.rules.inline.escape.exec(src);
 
-         i += d;
+             if (cap) {
+               return {
+                 type: 'escape',
+                 raw: cap[0],
+                 text: _escape(cap[1])
+               };
+             }
+           }
+         }, {
+           key: "tag",
+           value: function tag(src, inLink, inRawBlock) {
+             var cap = this.rules.inline.tag.exec(src);
 
-         e = s & ((1 << (-nBits)) - 1);
-         s >>= (-nBits);
-         nBits += eLen;
-         for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}
+             if (cap) {
+               if (!inLink && /^<a /i.test(cap[0])) {
+                 inLink = true;
+               } else if (inLink && /^<\/a>/i.test(cap[0])) {
+                 inLink = false;
+               }
 
-         m = e & ((1 << (-nBits)) - 1);
-         e >>= (-nBits);
-         nBits += mLen;
-         for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}
+               if (!inRawBlock && /^<(pre|code|kbd|script)(\s|>)/i.test(cap[0])) {
+                 inRawBlock = true;
+               } else if (inRawBlock && /^<\/(pre|code|kbd|script)(\s|>)/i.test(cap[0])) {
+                 inRawBlock = false;
+               }
 
-         if (e === 0) {
-           e = 1 - eBias;
-         } else if (e === eMax) {
-           return m ? NaN : ((s ? -1 : 1) * Infinity)
-         } else {
-           m = m + Math.pow(2, mLen);
-           e = e - eBias;
-         }
-         return (s ? -1 : 1) * m * Math.pow(2, e - mLen)
-       };
+               return {
+                 type: this.options.sanitize ? 'text' : 'html',
+                 raw: cap[0],
+                 inLink: inLink,
+                 inRawBlock: inRawBlock,
+                 text: this.options.sanitize ? this.options.sanitizer ? this.options.sanitizer(cap[0]) : _escape(cap[0]) : cap[0]
+               };
+             }
+           }
+         }, {
+           key: "link",
+           value: function link(src) {
+             var cap = this.rules.inline.link.exec(src);
 
-       var write$6 = function (buffer, value, offset, isLE, mLen, nBytes) {
-         var e, m, c;
-         var eLen = (nBytes * 8) - mLen - 1;
-         var eMax = (1 << eLen) - 1;
-         var eBias = eMax >> 1;
-         var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0);
-         var i = isLE ? 0 : (nBytes - 1);
-         var d = isLE ? 1 : -1;
-         var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0;
+             if (cap) {
+               var lastParenIndex = findClosingBracket$1(cap[2], '()');
 
-         value = Math.abs(value);
+               if (lastParenIndex > -1) {
+                 var start = cap[0].indexOf('!') === 0 ? 5 : 4;
+                 var linkLen = start + cap[1].length + lastParenIndex;
+                 cap[2] = cap[2].substring(0, lastParenIndex);
+                 cap[0] = cap[0].substring(0, linkLen).trim();
+                 cap[3] = '';
+               }
 
-         if (isNaN(value) || value === Infinity) {
-           m = isNaN(value) ? 1 : 0;
-           e = eMax;
-         } else {
-           e = Math.floor(Math.log(value) / Math.LN2);
-           if (value * (c = Math.pow(2, -e)) < 1) {
-             e--;
-             c *= 2;
-           }
-           if (e + eBias >= 1) {
-             value += rt / c;
-           } else {
-             value += rt * Math.pow(2, 1 - eBias);
-           }
-           if (value * c >= 2) {
-             e++;
-             c /= 2;
-           }
+               var href = cap[2];
+               var title = '';
 
-           if (e + eBias >= eMax) {
-             m = 0;
-             e = eMax;
-           } else if (e + eBias >= 1) {
-             m = ((value * c) - 1) * Math.pow(2, mLen);
-             e = e + eBias;
-           } else {
-             m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen);
-             e = 0;
-           }
-         }
+               if (this.options.pedantic) {
+                 var link = /^([^'"]*[^\s])\s+(['"])(.*)\2/.exec(href);
 
-         for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
+                 if (link) {
+                   href = link[1];
+                   title = link[3];
+                 } else {
+                   title = '';
+                 }
+               } else {
+                 title = cap[3] ? cap[3].slice(1, -1) : '';
+               }
 
-         e = (e << mLen) | m;
-         eLen += mLen;
-         for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
+               href = href.trim().replace(/^<([\s\S]*)>$/, '$1');
+               var token = outputLink(cap, {
+                 href: href ? href.replace(this.rules.inline._escapes, '$1') : href,
+                 title: title ? title.replace(this.rules.inline._escapes, '$1') : title
+               }, cap[0]);
+               return token;
+             }
+           }
+         }, {
+           key: "reflink",
+           value: function reflink(src, links) {
+             var cap;
 
-         buffer[offset + i - d] |= s * 128;
-       };
+             if ((cap = this.rules.inline.reflink.exec(src)) || (cap = this.rules.inline.nolink.exec(src))) {
+               var link = (cap[2] || cap[1]).replace(/\s+/g, ' ');
+               link = links[link.toLowerCase()];
 
-       var ieee754 = {
-               read: read$6,
-               write: write$6
-       };
+               if (!link || !link.href) {
+                 var text = cap[0].charAt(0);
+                 return {
+                   type: 'text',
+                   raw: text,
+                   text: text
+                 };
+               }
 
-       var pbf = Pbf;
+               var token = outputLink(cap, link, cap[0]);
+               return token;
+             }
+           }
+         }, {
+           key: "strong",
+           value: function strong(src, maskedSrc) {
+             var prevChar = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : '';
+             var match = this.rules.inline.strong.start.exec(src);
 
+             if (match && (!match[1] || match[1] && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar)))) {
+               maskedSrc = maskedSrc.slice(-1 * src.length);
+               var endReg = match[0] === '**' ? this.rules.inline.strong.endAst : this.rules.inline.strong.endUnd;
+               endReg.lastIndex = 0;
+               var cap;
 
+               while ((match = endReg.exec(maskedSrc)) != null) {
+                 cap = this.rules.inline.strong.middle.exec(maskedSrc.slice(0, match.index + 3));
 
-       function Pbf(buf) {
-           this.buf = ArrayBuffer.isView && ArrayBuffer.isView(buf) ? buf : new Uint8Array(buf || 0);
-           this.pos = 0;
-           this.type = 0;
-           this.length = this.buf.length;
-       }
+                 if (cap) {
+                   return {
+                     type: 'strong',
+                     raw: src.slice(0, cap[0].length),
+                     text: src.slice(2, cap[0].length - 2)
+                   };
+                 }
+               }
+             }
+           }
+         }, {
+           key: "em",
+           value: function em(src, maskedSrc) {
+             var prevChar = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : '';
+             var match = this.rules.inline.em.start.exec(src);
 
-       Pbf.Varint  = 0; // varint: int32, int64, uint32, uint64, sint32, sint64, bool, enum
-       Pbf.Fixed64 = 1; // 64-bit: double, fixed64, sfixed64
-       Pbf.Bytes   = 2; // length-delimited: string, bytes, embedded messages, packed repeated fields
-       Pbf.Fixed32 = 5; // 32-bit: float, fixed32, sfixed32
+             if (match && (!match[1] || match[1] && (prevChar === '' || this.rules.inline.punctuation.exec(prevChar)))) {
+               maskedSrc = maskedSrc.slice(-1 * src.length);
+               var endReg = match[0] === '*' ? this.rules.inline.em.endAst : this.rules.inline.em.endUnd;
+               endReg.lastIndex = 0;
+               var cap;
 
-       var SHIFT_LEFT_32 = (1 << 16) * (1 << 16),
-           SHIFT_RIGHT_32 = 1 / SHIFT_LEFT_32;
+               while ((match = endReg.exec(maskedSrc)) != null) {
+                 cap = this.rules.inline.em.middle.exec(maskedSrc.slice(0, match.index + 2));
 
-       // Threshold chosen based on both benchmarking and knowledge about browser string
-       // data structures (which currently switch structure types at 12 bytes or more)
-       var TEXT_DECODER_MIN_LENGTH = 12;
-       var utf8TextDecoder = typeof TextDecoder === 'undefined' ? null : new TextDecoder('utf8');
+                 if (cap) {
+                   return {
+                     type: 'em',
+                     raw: src.slice(0, cap[0].length),
+                     text: src.slice(1, cap[0].length - 1)
+                   };
+                 }
+               }
+             }
+           }
+         }, {
+           key: "codespan",
+           value: function codespan(src) {
+             var cap = this.rules.inline.code.exec(src);
 
-       Pbf.prototype = {
+             if (cap) {
+               var text = cap[2].replace(/\n/g, ' ');
+               var hasNonSpaceChars = /[^ ]/.test(text);
+               var hasSpaceCharsOnBothEnds = text.startsWith(' ') && text.endsWith(' ');
 
-           destroy: function() {
-               this.buf = null;
-           },
+               if (hasNonSpaceChars && hasSpaceCharsOnBothEnds) {
+                 text = text.substring(1, text.length - 1);
+               }
 
-           // === READING =================================================================
+               text = _escape(text, true);
+               return {
+                 type: 'codespan',
+                 raw: cap[0],
+                 text: text
+               };
+             }
+           }
+         }, {
+           key: "br",
+           value: function br(src) {
+             var cap = this.rules.inline.br.exec(src);
 
-           readFields: function(readField, result, end) {
-               end = end || this.length;
+             if (cap) {
+               return {
+                 type: 'br',
+                 raw: cap[0]
+               };
+             }
+           }
+         }, {
+           key: "del",
+           value: function del(src) {
+             var cap = this.rules.inline.del.exec(src);
 
-               while (this.pos < end) {
-                   var val = this.readVarint(),
-                       tag = val >> 3,
-                       startPos = this.pos;
+             if (cap) {
+               return {
+                 type: 'del',
+                 raw: cap[0],
+                 text: cap[1]
+               };
+             }
+           }
+         }, {
+           key: "autolink",
+           value: function autolink(src, mangle) {
+             var cap = this.rules.inline.autolink.exec(src);
 
-                   this.type = val & 0x7;
-                   readField(tag, result, this);
+             if (cap) {
+               var text, href;
 
-                   if (this.pos === startPos) this.skip(val);
+               if (cap[2] === '@') {
+                 text = _escape(this.options.mangle ? mangle(cap[1]) : cap[1]);
+                 href = 'mailto:' + text;
+               } else {
+                 text = _escape(cap[1]);
+                 href = text;
                }
-               return result;
-           },
 
-           readMessage: function(readField, result) {
-               return this.readFields(readField, result, this.readVarint() + this.pos);
-           },
+               return {
+                 type: 'link',
+                 raw: cap[0],
+                 text: text,
+                 href: href,
+                 tokens: [{
+                   type: 'text',
+                   raw: text,
+                   text: text
+                 }]
+               };
+             }
+           }
+         }, {
+           key: "url",
+           value: function url(src, mangle) {
+             var cap;
 
-           readFixed32: function() {
-               var val = readUInt32(this.buf, this.pos);
-               this.pos += 4;
-               return val;
-           },
+             if (cap = this.rules.inline.url.exec(src)) {
+               var text, href;
 
-           readSFixed32: function() {
-               var val = readInt32(this.buf, this.pos);
-               this.pos += 4;
-               return val;
-           },
+               if (cap[2] === '@') {
+                 text = _escape(this.options.mangle ? mangle(cap[0]) : cap[0]);
+                 href = 'mailto:' + text;
+               } else {
+                 // do extended autolink path validation
+                 var prevCapZero;
 
-           // 64-bit int handling is based on github.com/dpw/node-buffer-more-ints (MIT-licensed)
+                 do {
+                   prevCapZero = cap[0];
+                   cap[0] = this.rules.inline._backpedal.exec(cap[0])[0];
+                 } while (prevCapZero !== cap[0]);
 
-           readFixed64: function() {
-               var val = readUInt32(this.buf, this.pos) + readUInt32(this.buf, this.pos + 4) * SHIFT_LEFT_32;
-               this.pos += 8;
-               return val;
-           },
+                 text = _escape(cap[0]);
 
-           readSFixed64: function() {
-               var val = readUInt32(this.buf, this.pos) + readInt32(this.buf, this.pos + 4) * SHIFT_LEFT_32;
-               this.pos += 8;
-               return val;
-           },
+                 if (cap[1] === 'www.') {
+                   href = 'http://' + text;
+                 } else {
+                   href = text;
+                 }
+               }
 
-           readFloat: function() {
-               var val = ieee754.read(this.buf, this.pos, true, 23, 4);
-               this.pos += 4;
-               return val;
-           },
+               return {
+                 type: 'link',
+                 raw: cap[0],
+                 text: text,
+                 href: href,
+                 tokens: [{
+                   type: 'text',
+                   raw: text,
+                   text: text
+                 }]
+               };
+             }
+           }
+         }, {
+           key: "inlineText",
+           value: function inlineText(src, inRawBlock, smartypants) {
+             var cap = this.rules.inline.text.exec(src);
 
-           readDouble: function() {
-               var val = ieee754.read(this.buf, this.pos, true, 52, 8);
-               this.pos += 8;
-               return val;
-           },
+             if (cap) {
+               var text;
 
-           readVarint: function(isSigned) {
-               var buf = this.buf,
-                   val, b;
+               if (inRawBlock) {
+                 text = this.options.sanitize ? this.options.sanitizer ? this.options.sanitizer(cap[0]) : _escape(cap[0]) : cap[0];
+               } else {
+                 text = _escape(this.options.smartypants ? smartypants(cap[0]) : cap[0]);
+               }
 
-               b = buf[this.pos++]; val  =  b & 0x7f;        if (b < 0x80) return val;
-               b = buf[this.pos++]; val |= (b & 0x7f) << 7;  if (b < 0x80) return val;
-               b = buf[this.pos++]; val |= (b & 0x7f) << 14; if (b < 0x80) return val;
-               b = buf[this.pos++]; val |= (b & 0x7f) << 21; if (b < 0x80) return val;
-               b = buf[this.pos];   val |= (b & 0x0f) << 28;
+               return {
+                 type: 'text',
+                 raw: cap[0],
+                 text: text
+               };
+             }
+           }
+         }]);
 
-               return readVarintRemainder(val, isSigned, this);
-           },
+         return Tokenizer;
+       }();
 
-           readVarint64: function() { // for compatibility with v2.0.1
-               return this.readVarint(true);
-           },
+       var noopTest$1 = helpers.noopTest,
+           edit$1 = helpers.edit,
+           merge$2 = helpers.merge;
+       /**
+        * Block-Level Grammar
+        */
 
-           readSVarint: function() {
-               var num = this.readVarint();
-               return num % 2 === 1 ? (num + 1) / -2 : num / 2; // zigzag encoding
-           },
+       var block = {
+         newline: /^\n+/,
+         code: /^( {4}[^\n]+\n*)+/,
+         fences: /^ {0,3}(`{3,}(?=[^`\n]*\n)|~{3,})([^\n]*)\n(?:|([\s\S]*?)\n)(?: {0,3}\1[~`]* *(?:\n+|$)|$)/,
+         hr: /^ {0,3}((?:- *){3,}|(?:_ *){3,}|(?:\* *){3,})(?:\n+|$)/,
+         heading: /^ {0,3}(#{1,6}) +([^\n]*?)(?: +#+)? *(?:\n+|$)/,
+         blockquote: /^( {0,3}> ?(paragraph|[^\n]*)(?:\n|$))+/,
+         list: /^( {0,3})(bull) [\s\S]+?(?:hr|def|\n{2,}(?! )(?!\1bull )\n*|\s*$)/,
+         html: '^ {0,3}(?:' // optional indentation
+         + '<(script|pre|style)[\\s>][\\s\\S]*?(?:</\\1>[^\\n]*\\n+|$)' // (1)
+         + '|comment[^\\n]*(\\n+|$)' // (2)
+         + '|<\\?[\\s\\S]*?(?:\\?>\\n*|$)' // (3)
+         + '|<![A-Z][\\s\\S]*?(?:>\\n*|$)' // (4)
+         + '|<!\\[CDATA\\[[\\s\\S]*?(?:\\]\\]>\\n*|$)' // (5)
+         + '|</?(tag)(?: +|\\n|/?>)[\\s\\S]*?(?:\\n{2,}|$)' // (6)
+         + '|<(?!script|pre|style)([a-z][\\w-]*)(?:attribute)*? */?>(?=[ \\t]*(?:\\n|$))[\\s\\S]*?(?:\\n{2,}|$)' // (7) open tag
+         + '|</(?!script|pre|style)[a-z][\\w-]*\\s*>(?=[ \\t]*(?:\\n|$))[\\s\\S]*?(?:\\n{2,}|$)' // (7) closing tag
+         + ')',
+         def: /^ {0,3}\[(label)\]: *\n? *<?([^\s>]+)>?(?:(?: +\n? *| *\n *)(title))? *(?:\n+|$)/,
+         nptable: noopTest$1,
+         table: noopTest$1,
+         lheading: /^([^\n]+)\n {0,3}(=+|-+) *(?:\n+|$)/,
+         // regex template, placeholders will be replaced according to different paragraph
+         // interruption rules of commonmark and the original markdown spec:
+         _paragraph: /^([^\n]+(?:\n(?!hr|heading|lheading|blockquote|fences|list|html)[^\n]+)*)/,
+         text: /^[^\n]+/
+       };
+       block._label = /(?!\s*\])(?:\\[\[\]]|[^\[\]])+/;
+       block._title = /(?:"(?:\\"?|[^"\\])*"|'[^'\n]*(?:\n[^'\n]+)*\n?'|\([^()]*\))/;
+       block.def = edit$1(block.def).replace('label', block._label).replace('title', block._title).getRegex();
+       block.bullet = /(?:[*+-]|\d{1,9}[.)])/;
+       block.item = /^( *)(bull) ?[^\n]*(?:\n(?!\1bull ?)[^\n]*)*/;
+       block.item = edit$1(block.item, 'gm').replace(/bull/g, block.bullet).getRegex();
+       block.list = edit$1(block.list).replace(/bull/g, block.bullet).replace('hr', '\\n+(?=\\1?(?:(?:- *){3,}|(?:_ *){3,}|(?:\\* *){3,})(?:\\n+|$))').replace('def', '\\n+(?=' + block.def.source + ')').getRegex();
+       block._tag = 'address|article|aside|base|basefont|blockquote|body|caption' + '|center|col|colgroup|dd|details|dialog|dir|div|dl|dt|fieldset|figcaption' + '|figure|footer|form|frame|frameset|h[1-6]|head|header|hr|html|iframe' + '|legend|li|link|main|menu|menuitem|meta|nav|noframes|ol|optgroup|option' + '|p|param|section|source|summary|table|tbody|td|tfoot|th|thead|title|tr' + '|track|ul';
+       block._comment = /<!--(?!-?>)[\s\S]*?(?:-->|$)/;
+       block.html = edit$1(block.html, 'i').replace('comment', block._comment).replace('tag', block._tag).replace('attribute', / +[a-zA-Z:_][\w.:-]*(?: *= *"[^"\n]*"| *= *'[^'\n]*'| *= *[^\s"'=<>`]+)?/).getRegex();
+       block.paragraph = edit$1(block._paragraph).replace('hr', block.hr).replace('heading', ' {0,3}#{1,6} ').replace('|lheading', '') // setex headings don't interrupt commonmark paragraphs
+       .replace('blockquote', ' {0,3}>').replace('fences', ' {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n').replace('list', ' {0,3}(?:[*+-]|1[.)]) ') // only lists starting from 1 can interrupt
+       .replace('html', '</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|!--)').replace('tag', block._tag) // pars can be interrupted by type (6) html blocks
+       .getRegex();
+       block.blockquote = edit$1(block.blockquote).replace('paragraph', block.paragraph).getRegex();
+       /**
+        * Normal Block Grammar
+        */
 
-           readBoolean: function() {
-               return Boolean(this.readVarint());
-           },
+       block.normal = merge$2({}, block);
+       /**
+        * GFM Block Grammar
+        */
 
-           readString: function() {
-               var end = this.readVarint() + this.pos;
-               var pos = this.pos;
-               this.pos = end;
+       block.gfm = merge$2({}, block.normal, {
+         nptable: '^ *([^|\\n ].*\\|.*)\\n' // Header
+         + ' {0,3}([-:]+ *\\|[-| :]*)' // Align
+         + '(?:\\n((?:(?!\\n|hr|heading|blockquote|code|fences|list|html).*(?:\\n|$))*)\\n*|$)',
+         // Cells
+         table: '^ *\\|(.+)\\n' // Header
+         + ' {0,3}\\|?( *[-:]+[-| :]*)' // Align
+         + '(?:\\n *((?:(?!\\n|hr|heading|blockquote|code|fences|list|html).*(?:\\n|$))*)\\n*|$)' // Cells
 
-               if (end - pos >= TEXT_DECODER_MIN_LENGTH && utf8TextDecoder) {
-                   // longer strings are fast with the built-in browser TextDecoder API
-                   return readUtf8TextDecoder(this.buf, pos, end);
-               }
-               // short strings are fast with our custom implementation
-               return readUtf8(this.buf, pos, end);
-           },
+       });
+       block.gfm.nptable = edit$1(block.gfm.nptable).replace('hr', block.hr).replace('heading', ' {0,3}#{1,6} ').replace('blockquote', ' {0,3}>').replace('code', ' {4}[^\\n]').replace('fences', ' {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n').replace('list', ' {0,3}(?:[*+-]|1[.)]) ') // only lists starting from 1 can interrupt
+       .replace('html', '</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|!--)').replace('tag', block._tag) // tables can be interrupted by type (6) html blocks
+       .getRegex();
+       block.gfm.table = edit$1(block.gfm.table).replace('hr', block.hr).replace('heading', ' {0,3}#{1,6} ').replace('blockquote', ' {0,3}>').replace('code', ' {4}[^\\n]').replace('fences', ' {0,3}(?:`{3,}(?=[^`\\n]*\\n)|~{3,})[^\\n]*\\n').replace('list', ' {0,3}(?:[*+-]|1[.)]) ') // only lists starting from 1 can interrupt
+       .replace('html', '</?(?:tag)(?: +|\\n|/?>)|<(?:script|pre|style|!--)').replace('tag', block._tag) // tables can be interrupted by type (6) html blocks
+       .getRegex();
+       /**
+        * Pedantic grammar (original John Gruber's loose markdown specification)
+        */
 
-           readBytes: function() {
-               var end = this.readVarint() + this.pos,
-                   buffer = this.buf.subarray(this.pos, end);
-               this.pos = end;
-               return buffer;
-           },
+       block.pedantic = merge$2({}, block.normal, {
+         html: edit$1('^ *(?:comment *(?:\\n|\\s*$)' + '|<(tag)[\\s\\S]+?</\\1> *(?:\\n{2,}|\\s*$)' // closed tag
+         + '|<tag(?:"[^"]*"|\'[^\']*\'|\\s[^\'"/>\\s]*)*?/?> *(?:\\n{2,}|\\s*$))').replace('comment', block._comment).replace(/tag/g, '(?!(?:' + 'a|em|strong|small|s|cite|q|dfn|abbr|data|time|code|var|samp|kbd|sub' + '|sup|i|b|u|mark|ruby|rt|rp|bdi|bdo|span|br|wbr|ins|del|img)' + '\\b)\\w+(?!:|[^\\w\\s@]*@)\\b').getRegex(),
+         def: /^ *\[([^\]]+)\]: *<?([^\s>]+)>?(?: +(["(][^\n]+[")]))? *(?:\n+|$)/,
+         heading: /^ *(#{1,6}) *([^\n]+?) *(?:#+ *)?(?:\n+|$)/,
+         fences: noopTest$1,
+         // fences not supported
+         paragraph: edit$1(block.normal._paragraph).replace('hr', block.hr).replace('heading', ' *#{1,6} *[^\n]').replace('lheading', block.lheading).replace('blockquote', ' {0,3}>').replace('|fences', '').replace('|list', '').replace('|html', '').getRegex()
+       });
+       /**
+        * Inline-Level Grammar
+        */
 
-           // verbose for performance reasons; doesn't affect gzipped size
+       var inline = {
+         escape: /^\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/,
+         autolink: /^<(scheme:[^\s\x00-\x1f<>]*|email)>/,
+         url: noopTest$1,
+         tag: '^comment' + '|^</[a-zA-Z][\\w:-]*\\s*>' // self-closing tag
+         + '|^<[a-zA-Z][\\w-]*(?:attribute)*?\\s*/?>' // open tag
+         + '|^<\\?[\\s\\S]*?\\?>' // processing instruction, e.g. <?php ?>
+         + '|^<![a-zA-Z]+\\s[\\s\\S]*?>' // declaration, e.g. <!DOCTYPE html>
+         + '|^<!\\[CDATA\\[[\\s\\S]*?\\]\\]>',
+         // CDATA section
+         link: /^!?\[(label)\]\(\s*(href)(?:\s+(title))?\s*\)/,
+         reflink: /^!?\[(label)\]\[(?!\s*\])((?:\\[\[\]]?|[^\[\]\\])+)\]/,
+         nolink: /^!?\[(?!\s*\])((?:\[[^\[\]]*\]|\\[\[\]]|[^\[\]])*)\](?:\[\])?/,
+         reflinkSearch: 'reflink|nolink(?!\\()',
+         strong: {
+           start: /^(?:(\*\*(?=[*punctuation]))|\*\*)(?![\s])|__/,
+           // (1) returns if starts w/ punctuation
+           middle: /^\*\*(?:(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)|\*(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)*?\*)+?\*\*$|^__(?![\s])((?:(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)|_(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)*?_)+?)__$/,
+           endAst: /[^punctuation\s]\*\*(?!\*)|[punctuation]\*\*(?!\*)(?:(?=[punctuation_\s]|$))/,
+           // last char can't be punct, or final * must also be followed by punct (or endline)
+           endUnd: /[^\s]__(?!_)(?:(?=[punctuation*\s])|$)/ // last char can't be a space, and final _ must preceed punct or \s (or endline)
 
-           readPackedVarint: function(arr, isSigned) {
-               if (this.type !== Pbf.Bytes) return arr.push(this.readVarint(isSigned));
-               var end = readPackedEnd(this);
-               arr = arr || [];
-               while (this.pos < end) arr.push(this.readVarint(isSigned));
-               return arr;
-           },
-           readPackedSVarint: function(arr) {
-               if (this.type !== Pbf.Bytes) return arr.push(this.readSVarint());
-               var end = readPackedEnd(this);
-               arr = arr || [];
-               while (this.pos < end) arr.push(this.readSVarint());
-               return arr;
-           },
-           readPackedBoolean: function(arr) {
-               if (this.type !== Pbf.Bytes) return arr.push(this.readBoolean());
-               var end = readPackedEnd(this);
-               arr = arr || [];
-               while (this.pos < end) arr.push(this.readBoolean());
-               return arr;
-           },
-           readPackedFloat: function(arr) {
-               if (this.type !== Pbf.Bytes) return arr.push(this.readFloat());
-               var end = readPackedEnd(this);
-               arr = arr || [];
-               while (this.pos < end) arr.push(this.readFloat());
-               return arr;
-           },
-           readPackedDouble: function(arr) {
-               if (this.type !== Pbf.Bytes) return arr.push(this.readDouble());
-               var end = readPackedEnd(this);
-               arr = arr || [];
-               while (this.pos < end) arr.push(this.readDouble());
-               return arr;
-           },
-           readPackedFixed32: function(arr) {
-               if (this.type !== Pbf.Bytes) return arr.push(this.readFixed32());
-               var end = readPackedEnd(this);
-               arr = arr || [];
-               while (this.pos < end) arr.push(this.readFixed32());
-               return arr;
-           },
-           readPackedSFixed32: function(arr) {
-               if (this.type !== Pbf.Bytes) return arr.push(this.readSFixed32());
-               var end = readPackedEnd(this);
-               arr = arr || [];
-               while (this.pos < end) arr.push(this.readSFixed32());
-               return arr;
-           },
-           readPackedFixed64: function(arr) {
-               if (this.type !== Pbf.Bytes) return arr.push(this.readFixed64());
-               var end = readPackedEnd(this);
-               arr = arr || [];
-               while (this.pos < end) arr.push(this.readFixed64());
-               return arr;
-           },
-           readPackedSFixed64: function(arr) {
-               if (this.type !== Pbf.Bytes) return arr.push(this.readSFixed64());
-               var end = readPackedEnd(this);
-               arr = arr || [];
-               while (this.pos < end) arr.push(this.readSFixed64());
-               return arr;
-           },
+         },
+         em: {
+           start: /^(?:(\*(?=[punctuation]))|\*)(?![*\s])|_/,
+           // (1) returns if starts w/ punctuation
+           middle: /^\*(?:(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)|\*(?:(?!overlapSkip)(?:[^*]|\\\*)|overlapSkip)*?\*)+?\*$|^_(?![_\s])(?:(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)|_(?:(?!overlapSkip)(?:[^_]|\\_)|overlapSkip)*?_)+?_$/,
+           endAst: /[^punctuation\s]\*(?!\*)|[punctuation]\*(?!\*)(?:(?=[punctuation_\s]|$))/,
+           // last char can't be punct, or final * must also be followed by punct (or endline)
+           endUnd: /[^\s]_(?!_)(?:(?=[punctuation*\s])|$)/ // last char can't be a space, and final _ must preceed punct or \s (or endline)
 
-           skip: function(val) {
-               var type = val & 0x7;
-               if (type === Pbf.Varint) while (this.buf[this.pos++] > 0x7f) {}
-               else if (type === Pbf.Bytes) this.pos = this.readVarint() + this.pos;
-               else if (type === Pbf.Fixed32) this.pos += 4;
-               else if (type === Pbf.Fixed64) this.pos += 8;
-               else throw new Error('Unimplemented type: ' + type);
-           },
+         },
+         code: /^(`+)([^`]|[^`][\s\S]*?[^`])\1(?!`)/,
+         br: /^( {2,}|\\)\n(?!\s*$)/,
+         del: noopTest$1,
+         text: /^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*]|\b_|$)|[^ ](?= {2,}\n)))/,
+         punctuation: /^([\s*punctuation])/
+       }; // list of punctuation marks from common mark spec
+       // without * and _ to workaround cases with double emphasis
+
+       inline._punctuation = '!"#$%&\'()+\\-.,/:;<=>?@\\[\\]`^{|}~';
+       inline.punctuation = edit$1(inline.punctuation).replace(/punctuation/g, inline._punctuation).getRegex(); // sequences em should skip over [title](link), `code`, <html>
+
+       inline._blockSkip = '\\[[^\\]]*?\\]\\([^\\)]*?\\)|`[^`]*?`|<[^>]*?>';
+       inline._overlapSkip = '__[^_]*?__|\\*\\*\\[^\\*\\]*?\\*\\*';
+       inline._comment = edit$1(block._comment).replace('(?:-->|$)', '-->').getRegex();
+       inline.em.start = edit$1(inline.em.start).replace(/punctuation/g, inline._punctuation).getRegex();
+       inline.em.middle = edit$1(inline.em.middle).replace(/punctuation/g, inline._punctuation).replace(/overlapSkip/g, inline._overlapSkip).getRegex();
+       inline.em.endAst = edit$1(inline.em.endAst, 'g').replace(/punctuation/g, inline._punctuation).getRegex();
+       inline.em.endUnd = edit$1(inline.em.endUnd, 'g').replace(/punctuation/g, inline._punctuation).getRegex();
+       inline.strong.start = edit$1(inline.strong.start).replace(/punctuation/g, inline._punctuation).getRegex();
+       inline.strong.middle = edit$1(inline.strong.middle).replace(/punctuation/g, inline._punctuation).replace(/overlapSkip/g, inline._overlapSkip).getRegex();
+       inline.strong.endAst = edit$1(inline.strong.endAst, 'g').replace(/punctuation/g, inline._punctuation).getRegex();
+       inline.strong.endUnd = edit$1(inline.strong.endUnd, 'g').replace(/punctuation/g, inline._punctuation).getRegex();
+       inline.blockSkip = edit$1(inline._blockSkip, 'g').getRegex();
+       inline.overlapSkip = edit$1(inline._overlapSkip, 'g').getRegex();
+       inline._escapes = /\\([!"#$%&'()*+,\-./:;<=>?@\[\]\\^_`{|}~])/g;
+       inline._scheme = /[a-zA-Z][a-zA-Z0-9+.-]{1,31}/;
+       inline._email = /[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+(@)[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)+(?![-_])/;
+       inline.autolink = edit$1(inline.autolink).replace('scheme', inline._scheme).replace('email', inline._email).getRegex();
+       inline._attribute = /\s+[a-zA-Z:_][\w.:-]*(?:\s*=\s*"[^"]*"|\s*=\s*'[^']*'|\s*=\s*[^\s"'=<>`]+)?/;
+       inline.tag = edit$1(inline.tag).replace('comment', inline._comment).replace('attribute', inline._attribute).getRegex();
+       inline._label = /(?:\[(?:\\.|[^\[\]\\])*\]|\\.|`[^`]*`|[^\[\]\\`])*?/;
+       inline._href = /<(?:\\[<>]?|[^\s<>\\])*>|[^\s\x00-\x1f]*/;
+       inline._title = /"(?:\\"?|[^"\\])*"|'(?:\\'?|[^'\\])*'|\((?:\\\)?|[^)\\])*\)/;
+       inline.link = edit$1(inline.link).replace('label', inline._label).replace('href', inline._href).replace('title', inline._title).getRegex();
+       inline.reflink = edit$1(inline.reflink).replace('label', inline._label).getRegex();
+       inline.reflinkSearch = edit$1(inline.reflinkSearch, 'g').replace('reflink', inline.reflink).replace('nolink', inline.nolink).getRegex();
+       /**
+        * Normal Inline Grammar
+        */
 
-           // === WRITING =================================================================
+       inline.normal = merge$2({}, inline);
+       /**
+        * Pedantic Inline Grammar
+        */
 
-           writeTag: function(tag, type) {
-               this.writeVarint((tag << 3) | type);
-           },
+       inline.pedantic = merge$2({}, inline.normal, {
+         strong: {
+           start: /^__|\*\*/,
+           middle: /^__(?=\S)([\s\S]*?\S)__(?!_)|^\*\*(?=\S)([\s\S]*?\S)\*\*(?!\*)/,
+           endAst: /\*\*(?!\*)/g,
+           endUnd: /__(?!_)/g
+         },
+         em: {
+           start: /^_|\*/,
+           middle: /^()\*(?=\S)([\s\S]*?\S)\*(?!\*)|^_(?=\S)([\s\S]*?\S)_(?!_)/,
+           endAst: /\*(?!\*)/g,
+           endUnd: /_(?!_)/g
+         },
+         link: edit$1(/^!?\[(label)\]\((.*?)\)/).replace('label', inline._label).getRegex(),
+         reflink: edit$1(/^!?\[(label)\]\s*\[([^\]]*)\]/).replace('label', inline._label).getRegex()
+       });
+       /**
+        * GFM Inline Grammar
+        */
 
-           realloc: function(min) {
-               var length = this.length || 16;
+       inline.gfm = merge$2({}, inline.normal, {
+         escape: edit$1(inline.escape).replace('])', '~|])').getRegex(),
+         _extended_email: /[A-Za-z0-9._+-]+(@)[a-zA-Z0-9-_]+(?:\.[a-zA-Z0-9-_]*[a-zA-Z0-9])+(?![-_])/,
+         url: /^((?:ftp|https?):\/\/|www\.)(?:[a-zA-Z0-9\-]+\.?)+[^\s<]*|^email/,
+         _backpedal: /(?:[^?!.,:;*_~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_~)]+(?!$))+/,
+         del: /^~+(?=\S)([\s\S]*?\S)~+/,
+         text: /^(`+|[^`])(?:(?= {2,}\n)|[\s\S]*?(?:(?=[\\<!\[`*~]|\b_|https?:\/\/|ftp:\/\/|www\.|$)|[^ ](?= {2,}\n)|[^a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-](?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))|(?=[a-zA-Z0-9.!#$%&'*+\/=?_`{\|}~-]+@))/
+       });
+       inline.gfm.url = edit$1(inline.gfm.url, 'i').replace('email', inline.gfm._extended_email).getRegex();
+       /**
+        * GFM + Line Breaks Inline Grammar
+        */
 
-               while (length < this.pos + min) length *= 2;
+       inline.breaks = merge$2({}, inline.gfm, {
+         br: edit$1(inline.br).replace('{2,}', '*').getRegex(),
+         text: edit$1(inline.gfm.text).replace('\\b_', '\\b_| {2,}\\n').replace(/\{2,\}/g, '*').getRegex()
+       });
+       var rules = {
+         block: block,
+         inline: inline
+       };
 
-               if (length !== this.length) {
-                   var buf = new Uint8Array(length);
-                   buf.set(this.buf);
-                   this.buf = buf;
-                   this.length = length;
-               }
-           },
+       var defaults$2 = defaults.defaults;
+       var block$1 = rules.block,
+           inline$1 = rules.inline;
+       var repeatString$1 = helpers.repeatString;
+       /**
+        * smartypants text replacement
+        */
 
-           finish: function() {
-               this.length = this.pos;
-               this.pos = 0;
-               return this.buf.subarray(0, this.length);
-           },
+       function smartypants(text) {
+         return text // em-dashes
+         .replace(/---/g, "\u2014") // en-dashes
+         .replace(/--/g, "\u2013") // opening singles
+         .replace(/(^|[-\u2014/(\[{"\s])'/g, "$1\u2018") // closing singles & apostrophes
+         .replace(/'/g, "\u2019") // opening doubles
+         .replace(/(^|[-\u2014/(\[{\u2018\s])"/g, "$1\u201C") // closing doubles
+         .replace(/"/g, "\u201D") // ellipses
+         .replace(/\.{3}/g, "\u2026");
+       }
+       /**
+        * mangle email addresses
+        */
 
-           writeFixed32: function(val) {
-               this.realloc(4);
-               writeInt32(this.buf, val, this.pos);
-               this.pos += 4;
-           },
 
-           writeSFixed32: function(val) {
-               this.realloc(4);
-               writeInt32(this.buf, val, this.pos);
-               this.pos += 4;
-           },
+       function mangle(text) {
+         var out = '',
+             i,
+             ch;
+         var l = text.length;
 
-           writeFixed64: function(val) {
-               this.realloc(8);
-               writeInt32(this.buf, val & -1, this.pos);
-               writeInt32(this.buf, Math.floor(val * SHIFT_RIGHT_32), this.pos + 4);
-               this.pos += 8;
-           },
+         for (i = 0; i < l; i++) {
+           ch = text.charCodeAt(i);
 
-           writeSFixed64: function(val) {
-               this.realloc(8);
-               writeInt32(this.buf, val & -1, this.pos);
-               writeInt32(this.buf, Math.floor(val * SHIFT_RIGHT_32), this.pos + 4);
-               this.pos += 8;
-           },
+           if (Math.random() > 0.5) {
+             ch = 'x' + ch.toString(16);
+           }
 
-           writeVarint: function(val) {
-               val = +val || 0;
+           out += '&#' + ch + ';';
+         }
 
-               if (val > 0xfffffff || val < 0) {
-                   writeBigVarint(val, this);
-                   return;
-               }
+         return out;
+       }
+       /**
+        * Block Lexer
+        */
 
-               this.realloc(4);
 
-               this.buf[this.pos++] =           val & 0x7f  | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;
-               this.buf[this.pos++] = ((val >>>= 7) & 0x7f) | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;
-               this.buf[this.pos++] = ((val >>>= 7) & 0x7f) | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;
-               this.buf[this.pos++] =   (val >>> 7) & 0x7f;
-           },
+       var Lexer_1 = /*#__PURE__*/function () {
+         function Lexer(options) {
+           _classCallCheck(this, Lexer);
 
-           writeSVarint: function(val) {
-               this.writeVarint(val < 0 ? -val * 2 - 1 : val * 2);
-           },
+           this.tokens = [];
+           this.tokens.links = Object.create(null);
+           this.options = options || defaults$2;
+           this.options.tokenizer = this.options.tokenizer || new Tokenizer_1();
+           this.tokenizer = this.options.tokenizer;
+           this.tokenizer.options = this.options;
+           var rules = {
+             block: block$1.normal,
+             inline: inline$1.normal
+           };
 
-           writeBoolean: function(val) {
-               this.writeVarint(Boolean(val));
-           },
+           if (this.options.pedantic) {
+             rules.block = block$1.pedantic;
+             rules.inline = inline$1.pedantic;
+           } else if (this.options.gfm) {
+             rules.block = block$1.gfm;
 
-           writeString: function(str) {
-               str = String(str);
-               this.realloc(str.length * 4);
+             if (this.options.breaks) {
+               rules.inline = inline$1.breaks;
+             } else {
+               rules.inline = inline$1.gfm;
+             }
+           }
 
-               this.pos++; // reserve 1 byte for short string length
+           this.tokenizer.rules = rules;
+         }
+         /**
+          * Expose Rules
+          */
 
-               var startPos = this.pos;
-               // write the string directly to the buffer and see how much was written
-               this.pos = writeUtf8(this.buf, str, this.pos);
-               var len = this.pos - startPos;
 
-               if (len >= 0x80) makeRoomForExtraLength(startPos, len, this);
+         _createClass(Lexer, [{
+           key: "lex",
 
-               // finally, write the message length in the reserved place and restore the position
-               this.pos = startPos - 1;
-               this.writeVarint(len);
-               this.pos += len;
-           },
+           /**
+            * Preprocessing
+            */
+           value: function lex(src) {
+             src = src.replace(/\r\n|\r/g, '\n').replace(/\t/g, '    ');
+             this.blockTokens(src, this.tokens, true);
+             this.inline(this.tokens);
+             return this.tokens;
+           }
+           /**
+            * Lexing
+            */
 
-           writeFloat: function(val) {
-               this.realloc(4);
-               ieee754.write(this.buf, val, this.pos, true, 23, 4);
-               this.pos += 4;
-           },
+         }, {
+           key: "blockTokens",
+           value: function blockTokens(src) {
+             var tokens = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
+             var top = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : true;
+             src = src.replace(/^ +$/gm, '');
+             var token, i, l, lastToken;
+
+             while (src) {
+               // newline
+               if (token = this.tokenizer.space(src)) {
+                 src = src.substring(token.raw.length);
+
+                 if (token.type) {
+                   tokens.push(token);
+                 }
 
-           writeDouble: function(val) {
-               this.realloc(8);
-               ieee754.write(this.buf, val, this.pos, true, 52, 8);
-               this.pos += 8;
-           },
+                 continue;
+               } // code
 
-           writeBytes: function(buffer) {
-               var len = buffer.length;
-               this.writeVarint(len);
-               this.realloc(len);
-               for (var i = 0; i < len; i++) this.buf[this.pos++] = buffer[i];
-           },
 
-           writeRawMessage: function(fn, obj) {
-               this.pos++; // reserve 1 byte for short message length
+               if (token = this.tokenizer.code(src, tokens)) {
+                 src = src.substring(token.raw.length);
 
-               // write the message directly to the buffer and see how much was written
-               var startPos = this.pos;
-               fn(obj, this);
-               var len = this.pos - startPos;
+                 if (token.type) {
+                   tokens.push(token);
+                 } else {
+                   lastToken = tokens[tokens.length - 1];
+                   lastToken.raw += '\n' + token.raw;
+                   lastToken.text += '\n' + token.text;
+                 }
 
-               if (len >= 0x80) makeRoomForExtraLength(startPos, len, this);
+                 continue;
+               } // fences
 
-               // finally, write the message length in the reserved place and restore the position
-               this.pos = startPos - 1;
-               this.writeVarint(len);
-               this.pos += len;
-           },
 
-           writeMessage: function(tag, fn, obj) {
-               this.writeTag(tag, Pbf.Bytes);
-               this.writeRawMessage(fn, obj);
-           },
+               if (token = this.tokenizer.fences(src)) {
+                 src = src.substring(token.raw.length);
+                 tokens.push(token);
+                 continue;
+               } // heading
 
-           writePackedVarint:   function(tag, arr) { if (arr.length) this.writeMessage(tag, writePackedVarint, arr);   },
-           writePackedSVarint:  function(tag, arr) { if (arr.length) this.writeMessage(tag, writePackedSVarint, arr);  },
-           writePackedBoolean:  function(tag, arr) { if (arr.length) this.writeMessage(tag, writePackedBoolean, arr);  },
-           writePackedFloat:    function(tag, arr) { if (arr.length) this.writeMessage(tag, writePackedFloat, arr);    },
-           writePackedDouble:   function(tag, arr) { if (arr.length) this.writeMessage(tag, writePackedDouble, arr);   },
-           writePackedFixed32:  function(tag, arr) { if (arr.length) this.writeMessage(tag, writePackedFixed32, arr);  },
-           writePackedSFixed32: function(tag, arr) { if (arr.length) this.writeMessage(tag, writePackedSFixed32, arr); },
-           writePackedFixed64:  function(tag, arr) { if (arr.length) this.writeMessage(tag, writePackedFixed64, arr);  },
-           writePackedSFixed64: function(tag, arr) { if (arr.length) this.writeMessage(tag, writePackedSFixed64, arr); },
-
-           writeBytesField: function(tag, buffer) {
-               this.writeTag(tag, Pbf.Bytes);
-               this.writeBytes(buffer);
-           },
-           writeFixed32Field: function(tag, val) {
-               this.writeTag(tag, Pbf.Fixed32);
-               this.writeFixed32(val);
-           },
-           writeSFixed32Field: function(tag, val) {
-               this.writeTag(tag, Pbf.Fixed32);
-               this.writeSFixed32(val);
-           },
-           writeFixed64Field: function(tag, val) {
-               this.writeTag(tag, Pbf.Fixed64);
-               this.writeFixed64(val);
-           },
-           writeSFixed64Field: function(tag, val) {
-               this.writeTag(tag, Pbf.Fixed64);
-               this.writeSFixed64(val);
-           },
-           writeVarintField: function(tag, val) {
-               this.writeTag(tag, Pbf.Varint);
-               this.writeVarint(val);
-           },
-           writeSVarintField: function(tag, val) {
-               this.writeTag(tag, Pbf.Varint);
-               this.writeSVarint(val);
-           },
-           writeStringField: function(tag, str) {
-               this.writeTag(tag, Pbf.Bytes);
-               this.writeString(str);
-           },
-           writeFloatField: function(tag, val) {
-               this.writeTag(tag, Pbf.Fixed32);
-               this.writeFloat(val);
-           },
-           writeDoubleField: function(tag, val) {
-               this.writeTag(tag, Pbf.Fixed64);
-               this.writeDouble(val);
-           },
-           writeBooleanField: function(tag, val) {
-               this.writeVarintField(tag, Boolean(val));
-           }
-       };
 
-       function readVarintRemainder(l, s, p) {
-           var buf = p.buf,
-               h, b;
+               if (token = this.tokenizer.heading(src)) {
+                 src = src.substring(token.raw.length);
+                 tokens.push(token);
+                 continue;
+               } // table no leading pipe (gfm)
 
-           b = buf[p.pos++]; h  = (b & 0x70) >> 4;  if (b < 0x80) return toNum(l, h, s);
-           b = buf[p.pos++]; h |= (b & 0x7f) << 3;  if (b < 0x80) return toNum(l, h, s);
-           b = buf[p.pos++]; h |= (b & 0x7f) << 10; if (b < 0x80) return toNum(l, h, s);
-           b = buf[p.pos++]; h |= (b & 0x7f) << 17; if (b < 0x80) return toNum(l, h, s);
-           b = buf[p.pos++]; h |= (b & 0x7f) << 24; if (b < 0x80) return toNum(l, h, s);
-           b = buf[p.pos++]; h |= (b & 0x01) << 31; if (b < 0x80) return toNum(l, h, s);
 
-           throw new Error('Expected varint not more than 10 bytes');
-       }
+               if (token = this.tokenizer.nptable(src)) {
+                 src = src.substring(token.raw.length);
+                 tokens.push(token);
+                 continue;
+               } // hr
 
-       function readPackedEnd(pbf) {
-           return pbf.type === Pbf.Bytes ?
-               pbf.readVarint() + pbf.pos : pbf.pos + 1;
-       }
 
-       function toNum(low, high, isSigned) {
-           if (isSigned) {
-               return high * 0x100000000 + (low >>> 0);
-           }
+               if (token = this.tokenizer.hr(src)) {
+                 src = src.substring(token.raw.length);
+                 tokens.push(token);
+                 continue;
+               } // blockquote
 
-           return ((high >>> 0) * 0x100000000) + (low >>> 0);
-       }
 
-       function writeBigVarint(val, pbf) {
-           var low, high;
+               if (token = this.tokenizer.blockquote(src)) {
+                 src = src.substring(token.raw.length);
+                 token.tokens = this.blockTokens(token.text, [], top);
+                 tokens.push(token);
+                 continue;
+               } // list
 
-           if (val >= 0) {
-               low  = (val % 0x100000000) | 0;
-               high = (val / 0x100000000) | 0;
-           } else {
-               low  = ~(-val % 0x100000000);
-               high = ~(-val / 0x100000000);
 
-               if (low ^ 0xffffffff) {
-                   low = (low + 1) | 0;
-               } else {
-                   low = 0;
-                   high = (high + 1) | 0;
-               }
-           }
+               if (token = this.tokenizer.list(src)) {
+                 src = src.substring(token.raw.length);
+                 l = token.items.length;
 
-           if (val >= 0x10000000000000000 || val < -0x10000000000000000) {
-               throw new Error('Given varint doesn\'t fit into 10 bytes');
-           }
+                 for (i = 0; i < l; i++) {
+                   token.items[i].tokens = this.blockTokens(token.items[i].text, [], false);
+                 }
 
-           pbf.realloc(10);
+                 tokens.push(token);
+                 continue;
+               } // html
 
-           writeBigVarintLow(low, high, pbf);
-           writeBigVarintHigh(high, pbf);
-       }
 
-       function writeBigVarintLow(low, high, pbf) {
-           pbf.buf[pbf.pos++] = low & 0x7f | 0x80; low >>>= 7;
-           pbf.buf[pbf.pos++] = low & 0x7f | 0x80; low >>>= 7;
-           pbf.buf[pbf.pos++] = low & 0x7f | 0x80; low >>>= 7;
-           pbf.buf[pbf.pos++] = low & 0x7f | 0x80; low >>>= 7;
-           pbf.buf[pbf.pos]   = low & 0x7f;
-       }
+               if (token = this.tokenizer.html(src)) {
+                 src = src.substring(token.raw.length);
+                 tokens.push(token);
+                 continue;
+               } // def
 
-       function writeBigVarintHigh(high, pbf) {
-           var lsb = (high & 0x07) << 4;
 
-           pbf.buf[pbf.pos++] |= lsb         | ((high >>>= 3) ? 0x80 : 0); if (!high) return;
-           pbf.buf[pbf.pos++]  = high & 0x7f | ((high >>>= 7) ? 0x80 : 0); if (!high) return;
-           pbf.buf[pbf.pos++]  = high & 0x7f | ((high >>>= 7) ? 0x80 : 0); if (!high) return;
-           pbf.buf[pbf.pos++]  = high & 0x7f | ((high >>>= 7) ? 0x80 : 0); if (!high) return;
-           pbf.buf[pbf.pos++]  = high & 0x7f | ((high >>>= 7) ? 0x80 : 0); if (!high) return;
-           pbf.buf[pbf.pos++]  = high & 0x7f;
-       }
+               if (top && (token = this.tokenizer.def(src))) {
+                 src = src.substring(token.raw.length);
 
-       function makeRoomForExtraLength(startPos, len, pbf) {
-           var extraLen =
-               len <= 0x3fff ? 1 :
-               len <= 0x1fffff ? 2 :
-               len <= 0xfffffff ? 3 : Math.floor(Math.log(len) / (Math.LN2 * 7));
+                 if (!this.tokens.links[token.tag]) {
+                   this.tokens.links[token.tag] = {
+                     href: token.href,
+                     title: token.title
+                   };
+                 }
 
-           // if 1 byte isn't enough for encoding message length, shift the data to the right
-           pbf.realloc(extraLen);
-           for (var i = pbf.pos - 1; i >= startPos; i--) pbf.buf[i + extraLen] = pbf.buf[i];
-       }
+                 continue;
+               } // table (gfm)
 
-       function writePackedVarint(arr, pbf)   { for (var i = 0; i < arr.length; i++) pbf.writeVarint(arr[i]);   }
-       function writePackedSVarint(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeSVarint(arr[i]);  }
-       function writePackedFloat(arr, pbf)    { for (var i = 0; i < arr.length; i++) pbf.writeFloat(arr[i]);    }
-       function writePackedDouble(arr, pbf)   { for (var i = 0; i < arr.length; i++) pbf.writeDouble(arr[i]);   }
-       function writePackedBoolean(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeBoolean(arr[i]);  }
-       function writePackedFixed32(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeFixed32(arr[i]);  }
-       function writePackedSFixed32(arr, pbf) { for (var i = 0; i < arr.length; i++) pbf.writeSFixed32(arr[i]); }
-       function writePackedFixed64(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeFixed64(arr[i]);  }
-       function writePackedSFixed64(arr, pbf) { for (var i = 0; i < arr.length; i++) pbf.writeSFixed64(arr[i]); }
 
-       // Buffer code below from https://github.com/feross/buffer, MIT-licensed
+               if (token = this.tokenizer.table(src)) {
+                 src = src.substring(token.raw.length);
+                 tokens.push(token);
+                 continue;
+               } // lheading
 
-       function readUInt32(buf, pos) {
-           return ((buf[pos]) |
-               (buf[pos + 1] << 8) |
-               (buf[pos + 2] << 16)) +
-               (buf[pos + 3] * 0x1000000);
-       }
 
-       function writeInt32(buf, val, pos) {
-           buf[pos] = val;
-           buf[pos + 1] = (val >>> 8);
-           buf[pos + 2] = (val >>> 16);
-           buf[pos + 3] = (val >>> 24);
-       }
+               if (token = this.tokenizer.lheading(src)) {
+                 src = src.substring(token.raw.length);
+                 tokens.push(token);
+                 continue;
+               } // top-level paragraph
 
-       function readInt32(buf, pos) {
-           return ((buf[pos]) |
-               (buf[pos + 1] << 8) |
-               (buf[pos + 2] << 16)) +
-               (buf[pos + 3] << 24);
-       }
 
-       function readUtf8(buf, pos, end) {
-           var str = '';
-           var i = pos;
+               if (top && (token = this.tokenizer.paragraph(src))) {
+                 src = src.substring(token.raw.length);
+                 tokens.push(token);
+                 continue;
+               } // text
 
-           while (i < end) {
-               var b0 = buf[i];
-               var c = null; // codepoint
-               var bytesPerSequence =
-                   b0 > 0xEF ? 4 :
-                   b0 > 0xDF ? 3 :
-                   b0 > 0xBF ? 2 : 1;
 
-               if (i + bytesPerSequence > end) break;
+               if (token = this.tokenizer.text(src, tokens)) {
+                 src = src.substring(token.raw.length);
 
-               var b1, b2, b3;
+                 if (token.type) {
+                   tokens.push(token);
+                 } else {
+                   lastToken = tokens[tokens.length - 1];
+                   lastToken.raw += '\n' + token.raw;
+                   lastToken.text += '\n' + token.text;
+                 }
 
-               if (bytesPerSequence === 1) {
-                   if (b0 < 0x80) {
-                       c = b0;
-                   }
-               } else if (bytesPerSequence === 2) {
-                   b1 = buf[i + 1];
-                   if ((b1 & 0xC0) === 0x80) {
-                       c = (b0 & 0x1F) << 0x6 | (b1 & 0x3F);
-                       if (c <= 0x7F) {
-                           c = null;
-                       }
-                   }
-               } else if (bytesPerSequence === 3) {
-                   b1 = buf[i + 1];
-                   b2 = buf[i + 2];
-                   if ((b1 & 0xC0) === 0x80 && (b2 & 0xC0) === 0x80) {
-                       c = (b0 & 0xF) << 0xC | (b1 & 0x3F) << 0x6 | (b2 & 0x3F);
-                       if (c <= 0x7FF || (c >= 0xD800 && c <= 0xDFFF)) {
-                           c = null;
-                       }
-                   }
-               } else if (bytesPerSequence === 4) {
-                   b1 = buf[i + 1];
-                   b2 = buf[i + 2];
-                   b3 = buf[i + 3];
-                   if ((b1 & 0xC0) === 0x80 && (b2 & 0xC0) === 0x80 && (b3 & 0xC0) === 0x80) {
-                       c = (b0 & 0xF) << 0x12 | (b1 & 0x3F) << 0xC | (b2 & 0x3F) << 0x6 | (b3 & 0x3F);
-                       if (c <= 0xFFFF || c >= 0x110000) {
-                           c = null;
-                       }
-                   }
+                 continue;
                }
 
-               if (c === null) {
-                   c = 0xFFFD;
-                   bytesPerSequence = 1;
+               if (src) {
+                 var errMsg = 'Infinite loop on byte: ' + src.charCodeAt(0);
 
-               } else if (c > 0xFFFF) {
-                   c -= 0x10000;
-                   str += String.fromCharCode(c >>> 10 & 0x3FF | 0xD800);
-                   c = 0xDC00 | c & 0x3FF;
+                 if (this.options.silent) {
+                   console.error(errMsg);
+                   break;
+                 } else {
+                   throw new Error(errMsg);
+                 }
                }
+             }
 
-               str += String.fromCharCode(c);
-               i += bytesPerSequence;
+             return tokens;
            }
+         }, {
+           key: "inline",
+           value: function inline(tokens) {
+             var i, j, k, l2, row, token;
+             var l = tokens.length;
+
+             for (i = 0; i < l; i++) {
+               token = tokens[i];
+
+               switch (token.type) {
+                 case 'paragraph':
+                 case 'text':
+                 case 'heading':
+                   {
+                     token.tokens = [];
+                     this.inlineTokens(token.text, token.tokens);
+                     break;
+                   }
 
-           return str;
-       }
+                 case 'table':
+                   {
+                     token.tokens = {
+                       header: [],
+                       cells: []
+                     }; // header
 
-       function readUtf8TextDecoder(buf, pos, end) {
-           return utf8TextDecoder.decode(buf.subarray(pos, end));
-       }
+                     l2 = token.header.length;
 
-       function writeUtf8(buf, str, pos) {
-           for (var i = 0, c, lead; i < str.length; i++) {
-               c = str.charCodeAt(i); // code point
-
-               if (c > 0xD7FF && c < 0xE000) {
-                   if (lead) {
-                       if (c < 0xDC00) {
-                           buf[pos++] = 0xEF;
-                           buf[pos++] = 0xBF;
-                           buf[pos++] = 0xBD;
-                           lead = c;
-                           continue;
-                       } else {
-                           c = lead - 0xD800 << 10 | c - 0xDC00 | 0x10000;
-                           lead = null;
-                       }
-                   } else {
-                       if (c > 0xDBFF || (i + 1 === str.length)) {
-                           buf[pos++] = 0xEF;
-                           buf[pos++] = 0xBF;
-                           buf[pos++] = 0xBD;
-                       } else {
-                           lead = c;
-                       }
-                       continue;
-                   }
-               } else if (lead) {
-                   buf[pos++] = 0xEF;
-                   buf[pos++] = 0xBF;
-                   buf[pos++] = 0xBD;
-                   lead = null;
-               }
+                     for (j = 0; j < l2; j++) {
+                       token.tokens.header[j] = [];
+                       this.inlineTokens(token.header[j], token.tokens.header[j]);
+                     } // cells
 
-               if (c < 0x80) {
-                   buf[pos++] = c;
-               } else {
-                   if (c < 0x800) {
-                       buf[pos++] = c >> 0x6 | 0xC0;
-                   } else {
-                       if (c < 0x10000) {
-                           buf[pos++] = c >> 0xC | 0xE0;
-                       } else {
-                           buf[pos++] = c >> 0x12 | 0xF0;
-                           buf[pos++] = c >> 0xC & 0x3F | 0x80;
-                       }
-                       buf[pos++] = c >> 0x6 & 0x3F | 0x80;
-                   }
-                   buf[pos++] = c & 0x3F | 0x80;
-               }
-           }
-           return pos;
-       }
 
-       var pointGeometry = Point;
+                     l2 = token.cells.length;
 
-       /**
-        * A standalone point geometry with useful accessor, comparison, and
-        * modification methods.
-        *
-        * @class Point
-        * @param {Number} x the x-coordinate. this could be longitude or screen
-        * pixels, or any other sort of unit.
-        * @param {Number} y the y-coordinate. this could be latitude or screen
-        * pixels, or any other sort of unit.
-        * @example
-        * var point = new Point(-77, 38);
-        */
-       function Point(x, y) {
-           this.x = x;
-           this.y = y;
-       }
+                     for (j = 0; j < l2; j++) {
+                       row = token.cells[j];
+                       token.tokens.cells[j] = [];
 
-       Point.prototype = {
+                       for (k = 0; k < row.length; k++) {
+                         token.tokens.cells[j][k] = [];
+                         this.inlineTokens(row[k], token.tokens.cells[j][k]);
+                       }
+                     }
 
-           /**
-            * Clone this point, returning a new point that can be modified
-            * without affecting the old one.
-            * @return {Point} the clone
-            */
-           clone: function() { return new Point(this.x, this.y); },
+                     break;
+                   }
 
-           /**
-            * Add this point's x & y coordinates to another point,
-            * yielding a new point.
-            * @param {Point} p the other point
-            * @return {Point} output point
-            */
-           add:     function(p) { return this.clone()._add(p); },
+                 case 'blockquote':
+                   {
+                     this.inline(token.tokens);
+                     break;
+                   }
 
-           /**
-            * Subtract this point's x & y coordinates to from point,
-            * yielding a new point.
-            * @param {Point} p the other point
-            * @return {Point} output point
-            */
-           sub:     function(p) { return this.clone()._sub(p); },
+                 case 'list':
+                   {
+                     l2 = token.items.length;
 
-           /**
-            * Multiply this point's x & y coordinates by point,
-            * yielding a new point.
-            * @param {Point} p the other point
-            * @return {Point} output point
-            */
-           multByPoint:    function(p) { return this.clone()._multByPoint(p); },
+                     for (j = 0; j < l2; j++) {
+                       this.inline(token.items[j].tokens);
+                     }
 
-           /**
-            * Divide this point's x & y coordinates by point,
-            * yielding a new point.
-            * @param {Point} p the other point
-            * @return {Point} output point
-            */
-           divByPoint:     function(p) { return this.clone()._divByPoint(p); },
+                     break;
+                   }
+               }
+             }
 
+             return tokens;
+           }
            /**
-            * Multiply this point's x & y coordinates by a factor,
-            * yielding a new point.
-            * @param {Point} k factor
-            * @return {Point} output point
+            * Lexing/Compiling
             */
-           mult:    function(k) { return this.clone()._mult(k); },
 
-           /**
-            * Divide this point's x & y coordinates by a factor,
-            * yielding a new point.
-            * @param {Point} k factor
-            * @return {Point} output point
-            */
-           div:     function(k) { return this.clone()._div(k); },
+         }, {
+           key: "inlineTokens",
+           value: function inlineTokens(src) {
+             var tokens = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
+             var inLink = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
+             var inRawBlock = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : false;
+             var prevChar = arguments.length > 4 && arguments[4] !== undefined ? arguments[4] : '';
+             var token; // String with links masked to avoid interference with em and strong
 
-           /**
-            * Rotate this point around the 0, 0 origin by an angle a,
-            * given in radians
-            * @param {Number} a angle to rotate around, in radians
-            * @return {Point} output point
-            */
-           rotate:  function(a) { return this.clone()._rotate(a); },
+             var maskedSrc = src;
+             var match; // Mask out reflinks
 
-           /**
-            * Rotate this point around p point by an angle a,
-            * given in radians
-            * @param {Number} a angle to rotate around, in radians
-            * @param {Point} p Point to rotate around
-            * @return {Point} output point
-            */
-           rotateAround:  function(a,p) { return this.clone()._rotateAround(a,p); },
+             if (this.tokens.links) {
+               var links = Object.keys(this.tokens.links);
 
-           /**
-            * Multiply this point by a 4x1 transformation matrix
-            * @param {Array<Number>} m transformation matrix
-            * @return {Point} output point
-            */
-           matMult: function(m) { return this.clone()._matMult(m); },
+               if (links.length > 0) {
+                 while ((match = this.tokenizer.rules.inline.reflinkSearch.exec(maskedSrc)) != null) {
+                   if (links.includes(match[0].slice(match[0].lastIndexOf('[') + 1, -1))) {
+                     maskedSrc = maskedSrc.slice(0, match.index) + '[' + repeatString$1('a', match[0].length - 2) + ']' + maskedSrc.slice(this.tokenizer.rules.inline.reflinkSearch.lastIndex);
+                   }
+                 }
+               }
+             } // Mask out other blocks
 
-           /**
-            * Calculate this point but as a unit vector from 0, 0, meaning
-            * that the distance from the resulting point to the 0, 0
-            * coordinate will be equal to 1 and the angle from the resulting
-            * point to the 0, 0 coordinate will be the same as before.
-            * @return {Point} unit vector point
-            */
-           unit:    function() { return this.clone()._unit(); },
 
-           /**
-            * Compute a perpendicular point, where the new y coordinate
-            * is the old x coordinate and the new x coordinate is the old y
-            * coordinate multiplied by -1
-            * @return {Point} perpendicular point
-            */
-           perp:    function() { return this.clone()._perp(); },
+             while ((match = this.tokenizer.rules.inline.blockSkip.exec(maskedSrc)) != null) {
+               maskedSrc = maskedSrc.slice(0, match.index) + '[' + repeatString$1('a', match[0].length - 2) + ']' + maskedSrc.slice(this.tokenizer.rules.inline.blockSkip.lastIndex);
+             }
 
-           /**
-            * Return a version of this point with the x & y coordinates
-            * rounded to integers.
-            * @return {Point} rounded point
-            */
-           round:   function() { return this.clone()._round(); },
+             while (src) {
+               // escape
+               if (token = this.tokenizer.escape(src)) {
+                 src = src.substring(token.raw.length);
+                 tokens.push(token);
+                 continue;
+               } // tag
 
-           /**
-            * Return the magitude of this point: this is the Euclidean
-            * distance from the 0, 0 coordinate to this point's x and y
-            * coordinates.
-            * @return {Number} magnitude
-            */
-           mag: function() {
-               return Math.sqrt(this.x * this.x + this.y * this.y);
-           },
 
-           /**
-            * Judge whether this point is equal to another point, returning
-            * true or false.
-            * @param {Point} other the other point
-            * @return {boolean} whether the points are equal
-            */
-           equals: function(other) {
-               return this.x === other.x &&
-                      this.y === other.y;
-           },
+               if (token = this.tokenizer.tag(src, inLink, inRawBlock)) {
+                 src = src.substring(token.raw.length);
+                 inLink = token.inLink;
+                 inRawBlock = token.inRawBlock;
+                 tokens.push(token);
+                 continue;
+               } // link
 
-           /**
-            * Calculate the distance from this point to another point
-            * @param {Point} p the other point
-            * @return {Number} distance
-            */
-           dist: function(p) {
-               return Math.sqrt(this.distSqr(p));
-           },
 
-           /**
-            * Calculate the distance from this point to another point,
-            * without the square root step. Useful if you're comparing
-            * relative distances.
-            * @param {Point} p the other point
-            * @return {Number} distance
-            */
-           distSqr: function(p) {
-               var dx = p.x - this.x,
-                   dy = p.y - this.y;
-               return dx * dx + dy * dy;
-           },
+               if (token = this.tokenizer.link(src)) {
+                 src = src.substring(token.raw.length);
 
-           /**
-            * Get the angle from the 0, 0 coordinate to this point, in radians
-            * coordinates.
-            * @return {Number} angle
-            */
-           angle: function() {
-               return Math.atan2(this.y, this.x);
-           },
+                 if (token.type === 'link') {
+                   token.tokens = this.inlineTokens(token.text, [], true, inRawBlock);
+                 }
 
-           /**
-            * Get the angle from this point to another point, in radians
-            * @param {Point} b the other point
-            * @return {Number} angle
-            */
-           angleTo: function(b) {
-               return Math.atan2(this.y - b.y, this.x - b.x);
-           },
+                 tokens.push(token);
+                 continue;
+               } // reflink, nolink
 
-           /**
-            * Get the angle between this point and another point, in radians
-            * @param {Point} b the other point
-            * @return {Number} angle
-            */
-           angleWith: function(b) {
-               return this.angleWithSep(b.x, b.y);
-           },
 
-           /*
-            * Find the angle of the two vectors, solving the formula for
-            * the cross product a x b = |a||b|sin(θ) for θ.
-            * @param {Number} x the x-coordinate
-            * @param {Number} y the y-coordinate
-            * @return {Number} the angle in radians
-            */
-           angleWithSep: function(x, y) {
-               return Math.atan2(
-                   this.x * y - this.y * x,
-                   this.x * x + this.y * y);
-           },
+               if (token = this.tokenizer.reflink(src, this.tokens.links)) {
+                 src = src.substring(token.raw.length);
 
-           _matMult: function(m) {
-               var x = m[0] * this.x + m[1] * this.y,
-                   y = m[2] * this.x + m[3] * this.y;
-               this.x = x;
-               this.y = y;
-               return this;
-           },
+                 if (token.type === 'link') {
+                   token.tokens = this.inlineTokens(token.text, [], true, inRawBlock);
+                 }
 
-           _add: function(p) {
-               this.x += p.x;
-               this.y += p.y;
-               return this;
-           },
+                 tokens.push(token);
+                 continue;
+               } // strong
 
-           _sub: function(p) {
-               this.x -= p.x;
-               this.y -= p.y;
-               return this;
-           },
 
-           _mult: function(k) {
-               this.x *= k;
-               this.y *= k;
-               return this;
-           },
+               if (token = this.tokenizer.strong(src, maskedSrc, prevChar)) {
+                 src = src.substring(token.raw.length);
+                 token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
+                 tokens.push(token);
+                 continue;
+               } // em
 
-           _div: function(k) {
-               this.x /= k;
-               this.y /= k;
-               return this;
-           },
 
-           _multByPoint: function(p) {
-               this.x *= p.x;
-               this.y *= p.y;
-               return this;
-           },
+               if (token = this.tokenizer.em(src, maskedSrc, prevChar)) {
+                 src = src.substring(token.raw.length);
+                 token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
+                 tokens.push(token);
+                 continue;
+               } // code
 
-           _divByPoint: function(p) {
-               this.x /= p.x;
-               this.y /= p.y;
-               return this;
-           },
 
-           _unit: function() {
-               this._div(this.mag());
-               return this;
-           },
+               if (token = this.tokenizer.codespan(src)) {
+                 src = src.substring(token.raw.length);
+                 tokens.push(token);
+                 continue;
+               } // br
 
-           _perp: function() {
-               var y = this.y;
-               this.y = this.x;
-               this.x = -y;
-               return this;
-           },
 
-           _rotate: function(angle) {
-               var cos = Math.cos(angle),
-                   sin = Math.sin(angle),
-                   x = cos * this.x - sin * this.y,
-                   y = sin * this.x + cos * this.y;
-               this.x = x;
-               this.y = y;
-               return this;
-           },
+               if (token = this.tokenizer.br(src)) {
+                 src = src.substring(token.raw.length);
+                 tokens.push(token);
+                 continue;
+               } // del (gfm)
 
-           _rotateAround: function(angle, p) {
-               var cos = Math.cos(angle),
-                   sin = Math.sin(angle),
-                   x = p.x + cos * (this.x - p.x) - sin * (this.y - p.y),
-                   y = p.y + sin * (this.x - p.x) + cos * (this.y - p.y);
-               this.x = x;
-               this.y = y;
-               return this;
-           },
 
-           _round: function() {
-               this.x = Math.round(this.x);
-               this.y = Math.round(this.y);
-               return this;
-           }
-       };
+               if (token = this.tokenizer.del(src)) {
+                 src = src.substring(token.raw.length);
+                 token.tokens = this.inlineTokens(token.text, [], inLink, inRawBlock);
+                 tokens.push(token);
+                 continue;
+               } // autolink
 
-       /**
-        * Construct a point from an array if necessary, otherwise if the input
-        * is already a Point, or an unknown type, return it unchanged
-        * @param {Array<Number>|Point|*} a any kind of input value
-        * @return {Point} constructed point, or passed-through value.
-        * @example
-        * // this
-        * var point = Point.convert([0, 1]);
-        * // is equivalent to
-        * var point = new Point(0, 1);
-        */
-       Point.convert = function (a) {
-           if (a instanceof Point) {
-               return a;
-           }
-           if (Array.isArray(a)) {
-               return new Point(a[0], a[1]);
-           }
-           return a;
-       };
 
-       var vectortilefeature = VectorTileFeature;
+               if (token = this.tokenizer.autolink(src, mangle)) {
+                 src = src.substring(token.raw.length);
+                 tokens.push(token);
+                 continue;
+               } // url (gfm)
 
-       function VectorTileFeature(pbf, end, extent, keys, values) {
-           // Public
-           this.properties = {};
-           this.extent = extent;
-           this.type = 0;
 
-           // Private
-           this._pbf = pbf;
-           this._geometry = -1;
-           this._keys = keys;
-           this._values = values;
+               if (!inLink && (token = this.tokenizer.url(src, mangle))) {
+                 src = src.substring(token.raw.length);
+                 tokens.push(token);
+                 continue;
+               } // text
 
-           pbf.readFields(readFeature, this, end);
-       }
 
-       function readFeature(tag, feature, pbf) {
-           if (tag == 1) feature.id = pbf.readVarint();
-           else if (tag == 2) readTag(pbf, feature);
-           else if (tag == 3) feature.type = pbf.readVarint();
-           else if (tag == 4) feature._geometry = pbf.pos;
-       }
+               if (token = this.tokenizer.inlineText(src, inRawBlock, smartypants)) {
+                 src = src.substring(token.raw.length);
+                 prevChar = token.raw.slice(-1);
+                 tokens.push(token);
+                 continue;
+               }
 
-       function readTag(pbf, feature) {
-           var end = pbf.readVarint() + pbf.pos;
+               if (src) {
+                 var errMsg = 'Infinite loop on byte: ' + src.charCodeAt(0);
+
+                 if (this.options.silent) {
+                   console.error(errMsg);
+                   break;
+                 } else {
+                   throw new Error(errMsg);
+                 }
+               }
+             }
 
-           while (pbf.pos < end) {
-               var key = feature._keys[pbf.readVarint()],
-                   value = feature._values[pbf.readVarint()];
-               feature.properties[key] = value;
+             return tokens;
            }
-       }
+         }], [{
+           key: "lex",
 
-       VectorTileFeature.types = ['Unknown', 'Point', 'LineString', 'Polygon'];
+           /**
+            * Static Lex Method
+            */
+           value: function lex(src, options) {
+             var lexer = new Lexer(options);
+             return lexer.lex(src);
+           }
+           /**
+            * Static Lex Inline Method
+            */
 
-       VectorTileFeature.prototype.loadGeometry = function() {
-           var pbf = this._pbf;
-           pbf.pos = this._geometry;
+         }, {
+           key: "lexInline",
+           value: function lexInline(src, options) {
+             var lexer = new Lexer(options);
+             return lexer.inlineTokens(src);
+           }
+         }, {
+           key: "rules",
+           get: function get() {
+             return {
+               block: block$1,
+               inline: inline$1
+             };
+           }
+         }]);
 
-           var end = pbf.readVarint() + pbf.pos,
-               cmd = 1,
-               length = 0,
-               x = 0,
-               y = 0,
-               lines = [],
-               line;
+         return Lexer;
+       }();
 
-           while (pbf.pos < end) {
-               if (length <= 0) {
-                   var cmdLen = pbf.readVarint();
-                   cmd = cmdLen & 0x7;
-                   length = cmdLen >> 3;
-               }
+       var defaults$3 = defaults.defaults;
+       var cleanUrl$1 = helpers.cleanUrl,
+           escape$2 = helpers.escape;
+       /**
+        * Renderer
+        */
 
-               length--;
+       var Renderer_1 = /*#__PURE__*/function () {
+         function Renderer(options) {
+           _classCallCheck(this, Renderer);
 
-               if (cmd === 1 || cmd === 2) {
-                   x += pbf.readSVarint();
-                   y += pbf.readSVarint();
+           this.options = options || defaults$3;
+         }
 
-                   if (cmd === 1) { // moveTo
-                       if (line) lines.push(line);
-                       line = [];
-                   }
+         _createClass(Renderer, [{
+           key: "code",
+           value: function code(_code, infostring, escaped) {
+             var lang = (infostring || '').match(/\S*/)[0];
 
-                   line.push(new pointGeometry(x, y));
+             if (this.options.highlight) {
+               var out = this.options.highlight(_code, lang);
 
-               } else if (cmd === 7) {
+               if (out != null && out !== _code) {
+                 escaped = true;
+                 _code = out;
+               }
+             }
 
-                   // Workaround for https://github.com/mapbox/mapnik-vector-tile/issues/90
-                   if (line) {
-                       line.push(line[0].clone()); // closePolygon
-                   }
+             if (!lang) {
+               return '<pre><code>' + (escaped ? _code : escape$2(_code, true)) + '</code></pre>\n';
+             }
 
-               } else {
-                   throw new Error('unknown command ' + cmd);
-               }
+             return '<pre><code class="' + this.options.langPrefix + escape$2(lang, true) + '">' + (escaped ? _code : escape$2(_code, true)) + '</code></pre>\n';
            }
+         }, {
+           key: "blockquote",
+           value: function blockquote(quote) {
+             return '<blockquote>\n' + quote + '</blockquote>\n';
+           }
+         }, {
+           key: "html",
+           value: function html(_html) {
+             return _html;
+           }
+         }, {
+           key: "heading",
+           value: function heading(text, level, raw, slugger) {
+             if (this.options.headerIds) {
+               return '<h' + level + ' id="' + this.options.headerPrefix + slugger.slug(raw) + '">' + text + '</h' + level + '>\n';
+             } // ignore IDs
 
-           if (line) lines.push(line);
-
-           return lines;
-       };
 
-       VectorTileFeature.prototype.bbox = function() {
-           var pbf = this._pbf;
-           pbf.pos = this._geometry;
+             return '<h' + level + '>' + text + '</h' + level + '>\n';
+           }
+         }, {
+           key: "hr",
+           value: function hr() {
+             return this.options.xhtml ? '<hr/>\n' : '<hr>\n';
+           }
+         }, {
+           key: "list",
+           value: function list(body, ordered, start) {
+             var type = ordered ? 'ol' : 'ul',
+                 startatt = ordered && start !== 1 ? ' start="' + start + '"' : '';
+             return '<' + type + startatt + '>\n' + body + '</' + type + '>\n';
+           }
+         }, {
+           key: "listitem",
+           value: function listitem(text) {
+             return '<li>' + text + '</li>\n';
+           }
+         }, {
+           key: "checkbox",
+           value: function checkbox(checked) {
+             return '<input ' + (checked ? 'checked="" ' : '') + 'disabled="" type="checkbox"' + (this.options.xhtml ? ' /' : '') + '> ';
+           }
+         }, {
+           key: "paragraph",
+           value: function paragraph(text) {
+             return '<p>' + text + '</p>\n';
+           }
+         }, {
+           key: "table",
+           value: function table(header, body) {
+             if (body) body = '<tbody>' + body + '</tbody>';
+             return '<table>\n' + '<thead>\n' + header + '</thead>\n' + body + '</table>\n';
+           }
+         }, {
+           key: "tablerow",
+           value: function tablerow(content) {
+             return '<tr>\n' + content + '</tr>\n';
+           }
+         }, {
+           key: "tablecell",
+           value: function tablecell(content, flags) {
+             var type = flags.header ? 'th' : 'td';
+             var tag = flags.align ? '<' + type + ' align="' + flags.align + '">' : '<' + type + '>';
+             return tag + content + '</' + type + '>\n';
+           } // span level renderer
 
-           var end = pbf.readVarint() + pbf.pos,
-               cmd = 1,
-               length = 0,
-               x = 0,
-               y = 0,
-               x1 = Infinity,
-               x2 = -Infinity,
-               y1 = Infinity,
-               y2 = -Infinity;
+         }, {
+           key: "strong",
+           value: function strong(text) {
+             return '<strong>' + text + '</strong>';
+           }
+         }, {
+           key: "em",
+           value: function em(text) {
+             return '<em>' + text + '</em>';
+           }
+         }, {
+           key: "codespan",
+           value: function codespan(text) {
+             return '<code>' + text + '</code>';
+           }
+         }, {
+           key: "br",
+           value: function br() {
+             return this.options.xhtml ? '<br/>' : '<br>';
+           }
+         }, {
+           key: "del",
+           value: function del(text) {
+             return '<del>' + text + '</del>';
+           }
+         }, {
+           key: "link",
+           value: function link(href, title, text) {
+             href = cleanUrl$1(this.options.sanitize, this.options.baseUrl, href);
 
-           while (pbf.pos < end) {
-               if (length <= 0) {
-                   var cmdLen = pbf.readVarint();
-                   cmd = cmdLen & 0x7;
-                   length = cmdLen >> 3;
-               }
+             if (href === null) {
+               return text;
+             }
 
-               length--;
+             var out = '<a href="' + escape$2(href) + '"';
 
-               if (cmd === 1 || cmd === 2) {
-                   x += pbf.readSVarint();
-                   y += pbf.readSVarint();
-                   if (x < x1) x1 = x;
-                   if (x > x2) x2 = x;
-                   if (y < y1) y1 = y;
-                   if (y > y2) y2 = y;
+             if (title) {
+               out += ' title="' + title + '"';
+             }
 
-               } else if (cmd !== 7) {
-                   throw new Error('unknown command ' + cmd);
-               }
+             out += '>' + text + '</a>';
+             return out;
            }
+         }, {
+           key: "image",
+           value: function image(href, title, text) {
+             href = cleanUrl$1(this.options.sanitize, this.options.baseUrl, href);
 
-           return [x1, y1, x2, y2];
-       };
+             if (href === null) {
+               return text;
+             }
 
-       VectorTileFeature.prototype.toGeoJSON = function(x, y, z) {
-           var size = this.extent * Math.pow(2, z),
-               x0 = this.extent * x,
-               y0 = this.extent * y,
-               coords = this.loadGeometry(),
-               type = VectorTileFeature.types[this.type],
-               i, j;
+             var out = '<img src="' + href + '" alt="' + text + '"';
 
-           function project(line) {
-               for (var j = 0; j < line.length; j++) {
-                   var p = line[j], y2 = 180 - (p.y + y0) * 360 / size;
-                   line[j] = [
-                       (p.x + x0) * 360 / size - 180,
-                       360 / Math.PI * Math.atan(Math.exp(y2 * Math.PI / 180)) - 90
-                   ];
-               }
+             if (title) {
+               out += ' title="' + title + '"';
+             }
+
+             out += this.options.xhtml ? '/>' : '>';
+             return out;
+           }
+         }, {
+           key: "text",
+           value: function text(_text) {
+             return _text;
            }
+         }]);
 
-           switch (this.type) {
-           case 1:
-               var points = [];
-               for (i = 0; i < coords.length; i++) {
-                   points[i] = coords[i][0];
-               }
-               coords = points;
-               project(coords);
-               break;
+         return Renderer;
+       }();
 
-           case 2:
-               for (i = 0; i < coords.length; i++) {
-                   project(coords[i]);
-               }
-               break;
+       /**
+        * TextRenderer
+        * returns only the textual part of the token
+        */
+       var TextRenderer_1 = /*#__PURE__*/function () {
+         function TextRenderer() {
+           _classCallCheck(this, TextRenderer);
+         }
 
-           case 3:
-               coords = classifyRings(coords);
-               for (i = 0; i < coords.length; i++) {
-                   for (j = 0; j < coords[i].length; j++) {
-                       project(coords[i][j]);
-                   }
-               }
-               break;
+         _createClass(TextRenderer, [{
+           key: "strong",
+           // no need for block level renderers
+           value: function strong(text) {
+             return text;
            }
-
-           if (coords.length === 1) {
-               coords = coords[0];
-           } else {
-               type = 'Multi' + type;
+         }, {
+           key: "em",
+           value: function em(text) {
+             return text;
            }
-
-           var result = {
-               type: "Feature",
-               geometry: {
-                   type: type,
-                   coordinates: coords
-               },
-               properties: this.properties
-           };
-
-           if ('id' in this) {
-               result.id = this.id;
+         }, {
+           key: "codespan",
+           value: function codespan(text) {
+             return text;
+           }
+         }, {
+           key: "del",
+           value: function del(text) {
+             return text;
+           }
+         }, {
+           key: "html",
+           value: function html(text) {
+             return text;
+           }
+         }, {
+           key: "text",
+           value: function text(_text) {
+             return _text;
+           }
+         }, {
+           key: "link",
+           value: function link(href, title, text) {
+             return '' + text;
            }
+         }, {
+           key: "image",
+           value: function image(href, title, text) {
+             return '' + text;
+           }
+         }, {
+           key: "br",
+           value: function br() {
+             return '';
+           }
+         }]);
 
-           return result;
-       };
+         return TextRenderer;
+       }();
 
-       // classifies an array of rings into polygons with outer rings and holes
+       /**
+        * Slugger generates header id
+        */
+       var Slugger_1 = /*#__PURE__*/function () {
+         function Slugger() {
+           _classCallCheck(this, Slugger);
 
-       function classifyRings(rings) {
-           var len = rings.length;
+           this.seen = {};
+         }
 
-           if (len <= 1) return [rings];
+         _createClass(Slugger, [{
+           key: "serialize",
+           value: function serialize(value) {
+             return value.toLowerCase().trim() // remove html tags
+             .replace(/<[!\/a-z].*?>/ig, '') // remove unwanted chars
+             .replace(/[\u2000-\u206F\u2E00-\u2E7F\\'!"#$%&()*+,./:;<=>?@[\]^`{|}~]/g, '').replace(/\s/g, '-');
+           }
+           /**
+            * Finds the next safe (unique) slug to use
+            */
 
-           var polygons = [],
-               polygon,
-               ccw;
+         }, {
+           key: "getNextSafeSlug",
+           value: function getNextSafeSlug(originalSlug, isDryRun) {
+             var slug = originalSlug;
+             var occurenceAccumulator = 0;
 
-           for (var i = 0; i < len; i++) {
-               var area = signedArea$1(rings[i]);
-               if (area === 0) continue;
+             if (this.seen.hasOwnProperty(slug)) {
+               occurenceAccumulator = this.seen[originalSlug];
 
-               if (ccw === undefined) ccw = area < 0;
+               do {
+                 occurenceAccumulator++;
+                 slug = originalSlug + '-' + occurenceAccumulator;
+               } while (this.seen.hasOwnProperty(slug));
+             }
 
-               if (ccw === area < 0) {
-                   if (polygon) polygons.push(polygon);
-                   polygon = [rings[i]];
+             if (!isDryRun) {
+               this.seen[originalSlug] = occurenceAccumulator;
+               this.seen[slug] = 0;
+             }
 
-               } else {
-                   polygon.push(rings[i]);
-               }
+             return slug;
            }
-           if (polygon) polygons.push(polygon);
-
-           return polygons;
-       }
+           /**
+            * Convert string to unique id
+            * @param {object} options
+            * @param {boolean} options.dryrun Generates the next unique slug without updating the internal accumulator.
+            */
 
-       function signedArea$1(ring) {
-           var sum = 0;
-           for (var i = 0, len = ring.length, j = len - 1, p1, p2; i < len; j = i++) {
-               p1 = ring[i];
-               p2 = ring[j];
-               sum += (p2.x - p1.x) * (p1.y + p2.y);
+         }, {
+           key: "slug",
+           value: function slug(value) {
+             var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+             var slug = this.serialize(value);
+             return this.getNextSafeSlug(slug, options.dryrun);
            }
-           return sum;
-       }
+         }]);
 
-       var vectortilelayer = VectorTileLayer;
+         return Slugger;
+       }();
 
-       function VectorTileLayer(pbf, end) {
-           // Public
-           this.version = 1;
-           this.name = null;
-           this.extent = 4096;
-           this.length = 0;
+       var defaults$4 = defaults.defaults;
+       var unescape$2 = helpers.unescape;
+       /**
+        * Parsing & Compiling
+        */
 
-           // Private
-           this._pbf = pbf;
-           this._keys = [];
-           this._values = [];
-           this._features = [];
+       var Parser_1 = /*#__PURE__*/function () {
+         function Parser(options) {
+           _classCallCheck(this, Parser);
 
-           pbf.readFields(readLayer, this, end);
+           this.options = options || defaults$4;
+           this.options.renderer = this.options.renderer || new Renderer_1();
+           this.renderer = this.options.renderer;
+           this.renderer.options = this.options;
+           this.textRenderer = new TextRenderer_1();
+           this.slugger = new Slugger_1();
+         }
+         /**
+          * Static Parse Method
+          */
 
-           this.length = this._features.length;
-       }
 
-       function readLayer(tag, layer, pbf) {
-           if (tag === 15) layer.version = pbf.readVarint();
-           else if (tag === 1) layer.name = pbf.readString();
-           else if (tag === 5) layer.extent = pbf.readVarint();
-           else if (tag === 2) layer._features.push(pbf.pos);
-           else if (tag === 3) layer._keys.push(pbf.readString());
-           else if (tag === 4) layer._values.push(readValueMessage(pbf));
-       }
+         _createClass(Parser, [{
+           key: "parse",
 
-       function readValueMessage(pbf) {
-           var value = null,
-               end = pbf.readVarint() + pbf.pos;
+           /**
+            * Parse Loop
+            */
+           value: function parse(tokens) {
+             var top = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : true;
+             var out = '',
+                 i,
+                 j,
+                 k,
+                 l2,
+                 l3,
+                 row,
+                 cell,
+                 header,
+                 body,
+                 token,
+                 ordered,
+                 start,
+                 loose,
+                 itemBody,
+                 item,
+                 checked,
+                 task,
+                 checkbox;
+             var l = tokens.length;
+
+             for (i = 0; i < l; i++) {
+               token = tokens[i];
+
+               switch (token.type) {
+                 case 'space':
+                   {
+                     continue;
+                   }
 
-           while (pbf.pos < end) {
-               var tag = pbf.readVarint() >> 3;
+                 case 'hr':
+                   {
+                     out += this.renderer.hr();
+                     continue;
+                   }
 
-               value = tag === 1 ? pbf.readString() :
-                   tag === 2 ? pbf.readFloat() :
-                   tag === 3 ? pbf.readDouble() :
-                   tag === 4 ? pbf.readVarint64() :
-                   tag === 5 ? pbf.readVarint() :
-                   tag === 6 ? pbf.readSVarint() :
-                   tag === 7 ? pbf.readBoolean() : null;
-           }
+                 case 'heading':
+                   {
+                     out += this.renderer.heading(this.parseInline(token.tokens), token.depth, unescape$2(this.parseInline(token.tokens, this.textRenderer)), this.slugger);
+                     continue;
+                   }
 
-           return value;
-       }
+                 case 'code':
+                   {
+                     out += this.renderer.code(token.text, token.lang, token.escaped);
+                     continue;
+                   }
 
-       // return feature `i` from this layer as a `VectorTileFeature`
-       VectorTileLayer.prototype.feature = function(i) {
-           if (i < 0 || i >= this._features.length) throw new Error('feature index out of bounds');
+                 case 'table':
+                   {
+                     header = ''; // header
 
-           this._pbf.pos = this._features[i];
+                     cell = '';
+                     l2 = token.header.length;
 
-           var end = this._pbf.readVarint() + this._pbf.pos;
-           return new vectortilefeature(this._pbf, end, this.extent, this._keys, this._values);
-       };
+                     for (j = 0; j < l2; j++) {
+                       cell += this.renderer.tablecell(this.parseInline(token.tokens.header[j]), {
+                         header: true,
+                         align: token.align[j]
+                       });
+                     }
 
-       var vectortile = VectorTile;
+                     header += this.renderer.tablerow(cell);
+                     body = '';
+                     l2 = token.cells.length;
 
-       function VectorTile(pbf, end) {
-           this.layers = pbf.readFields(readTile, {}, end);
-       }
+                     for (j = 0; j < l2; j++) {
+                       row = token.tokens.cells[j];
+                       cell = '';
+                       l3 = row.length;
 
-       function readTile(tag, layers, pbf) {
-           if (tag === 3) {
-               var layer = new vectortilelayer(pbf, pbf.readVarint() + pbf.pos);
-               if (layer.length) layers[layer.name] = layer;
-           }
-       }
+                       for (k = 0; k < l3; k++) {
+                         cell += this.renderer.tablecell(this.parseInline(row[k]), {
+                           header: false,
+                           align: token.align[k]
+                         });
+                       }
 
-       var VectorTile$1 = vectortile;
-       var VectorTileFeature$1 = vectortilefeature;
-       var VectorTileLayer$1 = vectortilelayer;
+                       body += this.renderer.tablerow(cell);
+                     }
 
-       var vectorTile = {
-               VectorTile: VectorTile$1,
-               VectorTileFeature: VectorTileFeature$1,
-               VectorTileLayer: VectorTileLayer$1
-       };
+                     out += this.renderer.table(header, body);
+                     continue;
+                   }
 
-       var tiler$7 = utilTiler().tileSize(512).margin(1);
-       var dispatch$8 = dispatch('loadedData');
-       var _vtCache;
+                 case 'blockquote':
+                   {
+                     body = this.parse(token.tokens);
+                     out += this.renderer.blockquote(body);
+                     continue;
+                   }
 
+                 case 'list':
+                   {
+                     ordered = token.ordered;
+                     start = token.start;
+                     loose = token.loose;
+                     l2 = token.items.length;
+                     body = '';
+
+                     for (j = 0; j < l2; j++) {
+                       item = token.items[j];
+                       checked = item.checked;
+                       task = item.task;
+                       itemBody = '';
+
+                       if (item.task) {
+                         checkbox = this.renderer.checkbox(checked);
+
+                         if (loose) {
+                           if (item.tokens.length > 0 && item.tokens[0].type === 'text') {
+                             item.tokens[0].text = checkbox + ' ' + item.tokens[0].text;
+
+                             if (item.tokens[0].tokens && item.tokens[0].tokens.length > 0 && item.tokens[0].tokens[0].type === 'text') {
+                               item.tokens[0].tokens[0].text = checkbox + ' ' + item.tokens[0].tokens[0].text;
+                             }
+                           } else {
+                             item.tokens.unshift({
+                               type: 'text',
+                               text: checkbox
+                             });
+                           }
+                         } else {
+                           itemBody += checkbox;
+                         }
+                       }
 
-       function abortRequest$7(controller) {
-           controller.abort();
-       }
+                       itemBody += this.parse(item.tokens, loose);
+                       body += this.renderer.listitem(itemBody, task, checked);
+                     }
 
+                     out += this.renderer.list(body, ordered, start);
+                     continue;
+                   }
 
-       function vtToGeoJSON(data, tile, mergeCache) {
-           var vectorTile$1 = new vectorTile.VectorTile(new pbf(data));
-           var layers = Object.keys(vectorTile$1.layers);
-           if (!Array.isArray(layers)) { layers = [layers]; }
-
-           var features = [];
-           layers.forEach(function(layerID) {
-               var layer = vectorTile$1.layers[layerID];
-               if (layer) {
-                   for (var i = 0; i < layer.length; i++) {
-                       var feature = layer.feature(i).toGeoJSON(tile.xyz[0], tile.xyz[1], tile.xyz[2]);
-                       var geometry = feature.geometry;
-
-                       // Treat all Polygons as MultiPolygons
-                       if (geometry.type === 'Polygon') {
-                           geometry.type = 'MultiPolygon';
-                           geometry.coordinates = [geometry.coordinates];
-                       }
+                 case 'html':
+                   {
+                     // TODO parse inline content if parameter markdown=1
+                     out += this.renderer.html(token.text);
+                     continue;
+                   }
 
-                       // Clip to tile bounds
-                       if (geometry.type === 'MultiPolygon') {
-                           var isClipped = false;
-                           var featureClip = bboxClip_1(feature, tile.extent.rectangle());
-                           if (!fastDeepEqual(feature.geometry, featureClip.geometry)) {
-                               // feature = featureClip;
-                               isClipped = true;
-                           }
-                           if (!feature.geometry.coordinates.length) continue;   // not actually on this tile
-                           if (!feature.geometry.coordinates[0].length) continue;   // not actually on this tile
-                       }
+                 case 'paragraph':
+                   {
+                     out += this.renderer.paragraph(this.parseInline(token.tokens));
+                     continue;
+                   }
 
-                       // Generate some unique IDs and add some metadata
-                       var featurehash = utilHashcode(fastJsonStableStringify(feature));
-                       var propertyhash = utilHashcode(fastJsonStableStringify(feature.properties || {}));
-                       feature.__layerID__ = layerID.replace(/[^_a-zA-Z0-9\-]/g, '_');
-                       feature.__featurehash__ = featurehash;
-                       feature.__propertyhash__ = propertyhash;
-                       features.push(feature);
-
-                       // Clipped Polygons at same zoom with identical properties can get merged
-                       if (isClipped && geometry.type === 'MultiPolygon') {
-                           var merged = mergeCache[propertyhash];
-                           if (merged && merged.length) {
-                               var other = merged[0];
-                               var coords = union(
-                                   feature.geometry.coordinates,
-                                   other.geometry.coordinates
-                               );
-
-                               if (!coords || !coords.length) {
-                                   continue;  // something failed in martinez union
-                               }
-
-                               merged.push(feature);
-                               for (var j = 0; j < merged.length; j++) {      // all these features get...
-                                   merged[j].geometry.coordinates = coords;   // same coords
-                                   merged[j].__featurehash__ = featurehash;   // same hash, so deduplication works
-                               }
-                           } else {
-                               mergeCache[propertyhash] = [feature];
-                           }
-                       }
+                 case 'text':
+                   {
+                     body = token.tokens ? this.parseInline(token.tokens) : token.text;
+
+                     while (i + 1 < l && tokens[i + 1].type === 'text') {
+                       token = tokens[++i];
+                       body += '\n' + (token.tokens ? this.parseInline(token.tokens) : token.text);
+                     }
+
+                     out += top ? this.renderer.paragraph(body) : body;
+                     continue;
                    }
-               }
-           });
 
-           return features;
-       }
+                 default:
+                   {
+                     var errMsg = 'Token with "' + token.type + '" type was not found.';
 
+                     if (this.options.silent) {
+                       console.error(errMsg);
+                       return;
+                     } else {
+                       throw new Error(errMsg);
+                     }
+                   }
+               }
+             }
 
-       function loadTile(source, tile) {
-           if (source.loaded[tile.id] || source.inflight[tile.id]) return;
-
-           var url = source.template
-               .replace('{x}', tile.xyz[0])
-               .replace('{y}', tile.xyz[1])
-               // TMS-flipped y coordinate
-               .replace(/\{[t-]y\}/, Math.pow(2, tile.xyz[2]) - tile.xyz[1] - 1)
-               .replace(/\{z(oom)?\}/, tile.xyz[2])
-               .replace(/\{switch:([^}]+)\}/, function(s, r) {
-                   var subdomains = r.split(',');
-                   return subdomains[(tile.xyz[0] + tile.xyz[1]) % subdomains.length];
-               });
+             return out;
+           }
+           /**
+            * Parse Inline Tokens
+            */
 
+         }, {
+           key: "parseInline",
+           value: function parseInline(tokens, renderer) {
+             renderer = renderer || this.renderer;
+             var out = '',
+                 i,
+                 token;
+             var l = tokens.length;
+
+             for (i = 0; i < l; i++) {
+               token = tokens[i];
+
+               switch (token.type) {
+                 case 'escape':
+                   {
+                     out += renderer.text(token.text);
+                     break;
+                   }
 
-           var controller = new AbortController();
-           source.inflight[tile.id] = controller;
+                 case 'html':
+                   {
+                     out += renderer.html(token.text);
+                     break;
+                   }
 
-           fetch(url, { signal: controller.signal })
-               .then(function(response) {
-                   if (!response.ok) {
-                       throw new Error(response.status + ' ' + response.statusText);
+                 case 'link':
+                   {
+                     out += renderer.link(token.href, token.title, this.parseInline(token.tokens, renderer));
+                     break;
                    }
-                   source.loaded[tile.id] = [];
-                   delete source.inflight[tile.id];
-                   return response.arrayBuffer();
-               })
-               .then(function(data) {
-                   if (!data) {
-                       throw new Error('No Data');
+
+                 case 'image':
+                   {
+                     out += renderer.image(token.href, token.title, token.text);
+                     break;
                    }
 
-                   var z = tile.xyz[2];
-                   if (!source.canMerge[z]) {
-                       source.canMerge[z] = {};  // initialize mergeCache
+                 case 'strong':
+                   {
+                     out += renderer.strong(this.parseInline(token.tokens, renderer));
+                     break;
                    }
 
-                   source.loaded[tile.id] = vtToGeoJSON(data, tile, source.canMerge[z]);
-                   dispatch$8.call('loadedData');
-               })
-               .catch(function() {
-                   source.loaded[tile.id] = [];
-                   delete source.inflight[tile.id];
-               });
-       }
+                 case 'em':
+                   {
+                     out += renderer.em(this.parseInline(token.tokens, renderer));
+                     break;
+                   }
 
+                 case 'codespan':
+                   {
+                     out += renderer.codespan(token.text);
+                     break;
+                   }
 
-       var serviceVectorTile = {
+                 case 'br':
+                   {
+                     out += renderer.br();
+                     break;
+                   }
 
-           init: function() {
-               if (!_vtCache) {
-                   this.reset();
-               }
+                 case 'del':
+                   {
+                     out += renderer.del(this.parseInline(token.tokens, renderer));
+                     break;
+                   }
 
-               this.event = utilRebind(this, dispatch$8, 'on');
-           },
+                 case 'text':
+                   {
+                     out += renderer.text(token.text);
+                     break;
+                   }
 
+                 default:
+                   {
+                     var errMsg = 'Token with "' + token.type + '" type was not found.';
 
-           reset: function() {
-               for (var sourceID in _vtCache) {
-                   var source = _vtCache[sourceID];
-                   if (source && source.inflight) {
-                       Object.values(source.inflight).forEach(abortRequest$7);
+                     if (this.options.silent) {
+                       console.error(errMsg);
+                       return;
+                     } else {
+                       throw new Error(errMsg);
+                     }
                    }
                }
+             }
 
-               _vtCache = {};
-           },
+             return out;
+           }
+         }], [{
+           key: "parse",
+           value: function parse(tokens, options) {
+             var parser = new Parser(options);
+             return parser.parse(tokens);
+           }
+           /**
+            * Static Parse Inline Method
+            */
 
+         }, {
+           key: "parseInline",
+           value: function parseInline(tokens, options) {
+             var parser = new Parser(options);
+             return parser.parseInline(tokens);
+           }
+         }]);
+
+         return Parser;
+       }();
+
+       var merge$3 = helpers.merge,
+           checkSanitizeDeprecation$1 = helpers.checkSanitizeDeprecation,
+           escape$3 = helpers.escape;
+       var getDefaults = defaults.getDefaults,
+           changeDefaults = defaults.changeDefaults,
+           defaults$5 = defaults.defaults;
+       /**
+        * Marked
+        */
 
-           addSource: function(sourceID, template) {
-               _vtCache[sourceID] = { template: template, inflight: {}, loaded: {}, canMerge: {} };
-               return _vtCache[sourceID];
-           },
+       function marked(src, opt, callback) {
+         // throw error in case of non string input
+         if (typeof src === 'undefined' || src === null) {
+           throw new Error('marked(): input parameter is undefined or null');
+         }
 
+         if (typeof src !== 'string') {
+           throw new Error('marked(): input parameter is of type ' + Object.prototype.toString.call(src) + ', string expected');
+         }
 
-           data: function(sourceID, projection) {
-               var source = _vtCache[sourceID];
-               if (!source) return [];
+         if (typeof opt === 'function') {
+           callback = opt;
+           opt = null;
+         }
 
-               var tiles = tiler$7.getTiles(projection);
-               var seen = {};
-               var results = [];
+         opt = merge$3({}, marked.defaults, opt || {});
+         checkSanitizeDeprecation$1(opt);
 
-               for (var i = 0; i < tiles.length; i++) {
-                   var features = source.loaded[tiles[i].id];
-                   if (!features || !features.length) continue;
+         if (callback) {
+           var highlight = opt.highlight;
+           var tokens;
 
-                   for (var j = 0; j < features.length; j++) {
-                       var feature = features[j];
-                       var hash = feature.__featurehash__;
-                       if (seen[hash]) continue;
-                       seen[hash] = true;
+           try {
+             tokens = Lexer_1.lex(src, opt);
+           } catch (e) {
+             return callback(e);
+           }
 
-                       // return a shallow copy, because the hash may change
-                       // later if this feature gets merged with another
-                       results.push(Object.assign({}, feature));  // shallow copy
-                   }
-               }
+           var done = function done(err) {
+             var out;
 
-               return results;
-           },
+             if (!err) {
+               try {
+                 out = Parser_1.parse(tokens, opt);
+               } catch (e) {
+                 err = e;
+               }
+             }
 
+             opt.highlight = highlight;
+             return err ? callback(err) : callback(null, out);
+           };
 
-           loadTiles: function(sourceID, template, projection) {
-               var source = _vtCache[sourceID];
-               if (!source) {
-                   source = this.addSource(sourceID, template);
-               }
+           if (!highlight || highlight.length < 3) {
+             return done();
+           }
 
-               var tiles = tiler$7.getTiles(projection);
+           delete opt.highlight;
+           if (!tokens.length) return done();
+           var pending = 0;
+           marked.walkTokens(tokens, function (token) {
+             if (token.type === 'code') {
+               pending++;
+               setTimeout(function () {
+                 highlight(token.text, token.lang, function (err, code) {
+                   if (err) {
+                     return done(err);
+                   }
 
-               // abort inflight requests that are no longer needed
-               Object.keys(source.inflight).forEach(function(k) {
-                   var wanted = tiles.find(function(tile) { return k === tile.id; });
-                   if (!wanted) {
-                       abortRequest$7(source.inflight[k]);
-                       delete source.inflight[k];
+                   if (code != null && code !== token.text) {
+                     token.text = code;
+                     token.escaped = true;
                    }
-               });
 
-               tiles.forEach(function(tile) {
-                   loadTile(source, tile);
-               });
-           },
+                   pending--;
 
+                   if (pending === 0) {
+                     done();
+                   }
+                 });
+               }, 0);
+             }
+           });
 
-           cache: function() {
-               return _vtCache;
+           if (pending === 0) {
+             done();
            }
 
-       };
+           return;
+         }
 
-       var apibase$5 = 'https://www.wikidata.org/w/api.php?';
-       var _wikidataCache = {};
+         try {
+           var _tokens = Lexer_1.lex(src, opt);
 
+           if (opt.walkTokens) {
+             marked.walkTokens(_tokens, opt.walkTokens);
+           }
 
-       var serviceWikidata = {
+           return Parser_1.parse(_tokens, opt);
+         } catch (e) {
+           e.message += '\nPlease report this to https://github.com/markedjs/marked.';
 
-           init: function() {},
+           if (opt.silent) {
+             return '<p>An error occurred:</p><pre>' + escape$3(e.message + '', true) + '</pre>';
+           }
 
-           reset: function() {
-               _wikidataCache = {};
-           },
+           throw e;
+         }
+       }
+       /**
+        * Options
+        */
 
 
-           // Search for Wikidata items matching the query
-           itemsForSearchQuery: function(query, callback) {
-               if (!query) {
-                   if (callback) callback('No query', {});
-                   return;
-               }
+       marked.options = marked.setOptions = function (opt) {
+         merge$3(marked.defaults, opt);
+         changeDefaults(marked.defaults);
+         return marked;
+       };
 
-               var lang = this.languagesToQuery()[0];
-
-               var url = apibase$5 + utilQsString({
-                   action: 'wbsearchentities',
-                   format: 'json',
-                   formatversion: 2,
-                   search: query,
-                   type: 'item',
-                   // the language to search
-                   language: lang,
-                   // the langauge for the label and description in the result
-                   uselang: lang,
-                   limit: 10,
-                   origin: '*'
-               });
+       marked.getDefaults = getDefaults;
+       marked.defaults = defaults$5;
+       /**
+        * Use Extension
+        */
 
-               d3_json(url)
-                   .then(function(result) {
-                       if (result && result.error) {
-                           throw new Error(result.error);
-                       }
-                       if (callback) callback(null, result.search || {});
-                   })
-                   .catch(function(err) {
-                       if (callback) callback(err.message, {});
-                   });
-           },
+       marked.use = function (extension) {
+         var opts = merge$3({}, extension);
 
+         if (extension.renderer) {
+           (function () {
+             var renderer = marked.defaults.renderer || new Renderer_1();
 
-           // Given a Wikipedia language and article title,
-           // return an array of corresponding Wikidata entities.
-           itemsByTitle: function(lang, title, callback) {
-               if (!title) {
-                   if (callback) callback('No title', {});
-                   return;
-               }
+             var _loop = function _loop(prop) {
+               var prevRenderer = renderer[prop];
 
-               lang = lang || 'en';
-               var url = apibase$5 + utilQsString({
-                   action: 'wbgetentities',
-                   format: 'json',
-                   formatversion: 2,
-                   sites: lang.replace(/-/g, '_') + 'wiki',
-                   titles: title,
-                   languages: 'en', // shrink response by filtering to one language
-                   origin: '*'
-               });
+               renderer[prop] = function () {
+                 for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
+                   args[_key] = arguments[_key];
+                 }
 
-               d3_json(url)
-                   .then(function(result) {
-                       if (result && result.error) {
-                           throw new Error(result.error);
-                       }
-                       if (callback) callback(null, result.entities || {});
-                   })
-                   .catch(function(err) {
-                       if (callback) callback(err.message, {});
-                   });
-           },
+                 var ret = extension.renderer[prop].apply(renderer, args);
 
+                 if (ret === false) {
+                   ret = prevRenderer.apply(renderer, args);
+                 }
 
-           languagesToQuery: function() {
-               var localeCode = _mainLocalizer.localeCode().toLowerCase();
-               // HACK: en-us isn't a wikidata language. We should really be filtering by
-               // the languages known to be supported by wikidata.
-               if (localeCode === 'en-us') localeCode = 'en';
-               return utilArrayUniq([
-                   localeCode,
-                   _mainLocalizer.languageCode().toLowerCase(),
-                   'en'
-               ]);
-           },
+                 return ret;
+               };
+             };
 
+             for (var prop in extension.renderer) {
+               _loop(prop);
+             }
 
-           entityByQID: function(qid, callback) {
-               if (!qid) {
-                   callback('No qid', {});
-                   return;
-               }
-               if (_wikidataCache[qid]) {
-                   if (callback) callback(null, _wikidataCache[qid]);
-                   return;
-               }
+             opts.renderer = renderer;
+           })();
+         }
 
-               var langs = this.languagesToQuery();
-               var url = apibase$5 + utilQsString({
-                   action: 'wbgetentities',
-                   format: 'json',
-                   formatversion: 2,
-                   ids: qid,
-                   props: 'labels|descriptions|claims|sitelinks',
-                   sitefilter: langs.map(function(d) { return d + 'wiki'; }).join('|'),
-                   languages: langs.join('|'),
-                   languagefallback: 1,
-                   origin: '*'
-               });
+         if (extension.tokenizer) {
+           (function () {
+             var tokenizer = marked.defaults.tokenizer || new Tokenizer_1();
 
-               d3_json(url)
-                   .then(function(result) {
-                       if (result && result.error) {
-                           throw new Error(result.error);
-                       }
-                       if (callback) callback(null, result.entities[qid] || {});
-                   })
-                   .catch(function(err) {
-                       if (callback) callback(err.message, {});
-                   });
-           },
+             var _loop2 = function _loop2(prop) {
+               var prevTokenizer = tokenizer[prop];
 
+               tokenizer[prop] = function () {
+                 for (var _len2 = arguments.length, args = new Array(_len2), _key2 = 0; _key2 < _len2; _key2++) {
+                   args[_key2] = arguments[_key2];
+                 }
 
-           // Pass `params` object of the form:
-           // {
-           //   qid: 'string'      // brand wikidata  (e.g. 'Q37158')
-           // }
-           //
-           // Get an result object used to display tag documentation
-           // {
-           //   title:        'string',
-           //   description:  'string',
-           //   editURL:      'string',
-           //   imageURL:     'string',
-           //   wiki:         { title: 'string', text: 'string', url: 'string' }
-           // }
-           //
-           getDocs: function(params, callback) {
-               var langs = this.languagesToQuery();
-               this.entityByQID(params.qid, function(err, entity) {
-                   if (err || !entity) {
-                       callback(err || 'No entity');
-                       return;
-                   }
+                 var ret = extension.tokenizer[prop].apply(tokenizer, args);
 
-                   var i;
-                   var description;
-                   if (entity.descriptions && Object.keys(entity.descriptions).length > 0) {
-                       description = entity.descriptions[Object.keys(entity.descriptions)[0]].value;
-                   }
+                 if (ret === false) {
+                   ret = prevTokenizer.apply(tokenizer, args);
+                 }
 
-                   // prepare result
-                   var result = {
-                       title: entity.id,
-                       description: description,
-                       editURL: 'https://www.wikidata.org/wiki/' + entity.id
-                   };
+                 return ret;
+               };
+             };
 
-                   // add image
-                   if (entity.claims) {
-                       var imageroot = 'https://commons.wikimedia.org/w/index.php';
-                       var props = ['P154','P18'];  // logo image, image
-                       var prop, image;
-                       for (i = 0; i < props.length; i++) {
-                           prop = entity.claims[props[i]];
-                           if (prop && Object.keys(prop).length > 0) {
-                               image = prop[Object.keys(prop)[0]].mainsnak.datavalue.value;
-                               if (image) {
-                                   result.imageURL = imageroot + '?' + utilQsString({
-                                       title: 'Special:Redirect/file/' + image,
-                                       width: 400
-                                   });
-                                   break;
-                               }
-                           }
-                       }
-                   }
+             for (var prop in extension.tokenizer) {
+               _loop2(prop);
+             }
 
-                   if (entity.sitelinks) {
-                       var englishLocale = _mainLocalizer.languageCode().toLowerCase() === 'en';
-
-                       // must be one of these that we requested..
-                       for (i = 0; i < langs.length; i++) {   // check each, in order of preference
-                           var w = langs[i] + 'wiki';
-                           if (entity.sitelinks[w]) {
-                               var title = entity.sitelinks[w].title;
-                               var tKey = 'inspector.wiki_reference';
-                               if (!englishLocale && langs[i] === 'en') {   // user's locale isn't English but
-                                   tKey = 'inspector.wiki_en_reference';    // we are sending them to enwiki anyway..
-                               }
-
-                               result.wiki = {
-                                   title: title,
-                                   text: tKey,
-                                   url: 'https://' + langs[i] + '.wikipedia.org/wiki/' + title.replace(/ /g, '_')
-                               };
-                               break;
-                           }
-                       }
-                   }
+             opts.tokenizer = tokenizer;
+           })();
+         }
 
-                   callback(null, result);
-               });
-           }
+         if (extension.walkTokens) {
+           var walkTokens = marked.defaults.walkTokens;
+
+           opts.walkTokens = function (token) {
+             extension.walkTokens(token);
+
+             if (walkTokens) {
+               walkTokens(token);
+             }
+           };
+         }
 
+         marked.setOptions(opts);
        };
+       /**
+        * Run callback for every token
+        */
 
-       var endpoint = 'https://en.wikipedia.org/w/api.php?';
 
-       var serviceWikipedia = {
+       marked.walkTokens = function (tokens, callback) {
+         var _iterator = _createForOfIteratorHelper(tokens),
+             _step;
 
-           init: function() {},
-           reset: function() {},
+         try {
+           for (_iterator.s(); !(_step = _iterator.n()).done;) {
+             var token = _step.value;
+             callback(token);
 
+             switch (token.type) {
+               case 'table':
+                 {
+                   var _iterator2 = _createForOfIteratorHelper(token.tokens.header),
+                       _step2;
 
-           search: function(lang, query, callback) {
-               if (!query) {
-                   if (callback) callback('No Query', []);
-                   return;
-               }
+                   try {
+                     for (_iterator2.s(); !(_step2 = _iterator2.n()).done;) {
+                       var cell = _step2.value;
+                       marked.walkTokens(cell, callback);
+                     }
+                   } catch (err) {
+                     _iterator2.e(err);
+                   } finally {
+                     _iterator2.f();
+                   }
 
-               lang = lang || 'en';
-               var url = endpoint.replace('en', lang) +
-                   utilQsString({
-                       action: 'query',
-                       list: 'search',
-                       srlimit: '10',
-                       srinfo: 'suggestion',
-                       format: 'json',
-                       origin: '*',
-                       srsearch: query
-                   });
+                   var _iterator3 = _createForOfIteratorHelper(token.tokens.cells),
+                       _step3;
 
-               d3_json(url)
-                   .then(function(result) {
-                       if (result && result.error) {
-                           throw new Error(result.error);
-                       } else if (!result || !result.query || !result.query.search) {
-                           throw new Error('No Results');
-                       }
-                       if (callback) {
-                           var titles = result.query.search.map(function(d) { return d.title; });
-                           callback(null, titles);
+                   try {
+                     for (_iterator3.s(); !(_step3 = _iterator3.n()).done;) {
+                       var row = _step3.value;
+
+                       var _iterator4 = _createForOfIteratorHelper(row),
+                           _step4;
+
+                       try {
+                         for (_iterator4.s(); !(_step4 = _iterator4.n()).done;) {
+                           var _cell = _step4.value;
+                           marked.walkTokens(_cell, callback);
+                         }
+                       } catch (err) {
+                         _iterator4.e(err);
+                       } finally {
+                         _iterator4.f();
                        }
-                   })
-                   .catch(function(err) {
-                       if (callback) callback(err, []);
-                   });
-           },
+                     }
+                   } catch (err) {
+                     _iterator3.e(err);
+                   } finally {
+                     _iterator3.f();
+                   }
 
+                   break;
+                 }
 
-           suggestions: function(lang, query, callback) {
-               if (!query) {
-                   if (callback) callback('', []);
-                   return;
-               }
+               case 'list':
+                 {
+                   marked.walkTokens(token.items, callback);
+                   break;
+                 }
 
-               lang = lang || 'en';
-               var url = endpoint.replace('en', lang) +
-                   utilQsString({
-                       action: 'opensearch',
-                       namespace: 0,
-                       suggest: '',
-                       format: 'json',
-                       origin: '*',
-                       search: query
-                   });
+               default:
+                 {
+                   if (token.tokens) {
+                     marked.walkTokens(token.tokens, callback);
+                   }
+                 }
+             }
+           }
+         } catch (err) {
+           _iterator.e(err);
+         } finally {
+           _iterator.f();
+         }
+       };
+       /**
+        * Parse Inline
+        */
 
-               d3_json(url)
-                   .then(function(result) {
-                       if (result && result.error) {
-                           throw new Error(result.error);
-                       } else if (!result || result.length < 2) {
-                           throw new Error('No Results');
-                       }
-                       if (callback) callback(null, result[1] || []);
-                   })
-                   .catch(function(err) {
-                       if (callback) callback(err.message, []);
-                   });
-           },
 
+       marked.parseInline = function (src, opt) {
+         // throw error in case of non string input
+         if (typeof src === 'undefined' || src === null) {
+           throw new Error('marked.parseInline(): input parameter is undefined or null');
+         }
 
-           translations: function(lang, title, callback) {
-               if (!title) {
-                   if (callback) callback('No Title');
-                   return;
-               }
+         if (typeof src !== 'string') {
+           throw new Error('marked.parseInline(): input parameter is of type ' + Object.prototype.toString.call(src) + ', string expected');
+         }
 
-               var url = endpoint.replace('en', lang) +
-                   utilQsString({
-                       action: 'query',
-                       prop: 'langlinks',
-                       format: 'json',
-                       origin: '*',
-                       lllimit: 500,
-                       titles: title
-                   });
+         opt = merge$3({}, marked.defaults, opt || {});
+         checkSanitizeDeprecation$1(opt);
 
-               d3_json(url)
-                   .then(function(result) {
-                       if (result && result.error) {
-                           throw new Error(result.error);
-                       } else if (!result || !result.query || !result.query.pages) {
-                           throw new Error('No Results');
-                       }
-                       if (callback) {
-                           var list = result.query.pages[Object.keys(result.query.pages)[0]];
-                           var translations = {};
-                           if (list && list.langlinks) {
-                               list.langlinks.forEach(function(d) { translations[d.lang] = d['*']; });
-                           }
-                           callback(null, translations);
-                       }
-                   })
-                   .catch(function(err) {
-                       if (callback) callback(err.message);
-                   });
-           }
+         try {
+           var tokens = Lexer_1.lexInline(src, opt);
 
-       };
+           if (opt.walkTokens) {
+             marked.walkTokens(tokens, opt.walkTokens);
+           }
 
-       var services = {
-           geocoder: serviceNominatim,
-           keepRight: serviceKeepRight,
-           improveOSM: serviceImproveOSM,
-           osmose: serviceOsmose,
-           mapillary: serviceMapillary,
-           openstreetcam: serviceOpenstreetcam,
-           osm: serviceOsm,
-           osmWikibase: serviceOsmWikibase,
-           maprules: serviceMapRules,
-           streetside: serviceStreetside,
-           taginfo: serviceTaginfo,
-           vectorTile: serviceVectorTile,
-           wikidata: serviceWikidata,
-           wikipedia: serviceWikipedia
-       };
+           return Parser_1.parseInline(tokens, opt);
+         } catch (e) {
+           e.message += '\nPlease report this to https://github.com/markedjs/marked.';
 
-       function svgIcon(name, svgklass, useklass) {
-           return function drawIcon(selection) {
-               selection.selectAll('svg.icon' + (svgklass ? '.' + svgklass.split(' ')[0] : ''))
-                   .data([0])
-                   .enter()
-                   .append('svg')
-                   .attr('class', 'icon ' + (svgklass || ''))
-                   .append('use')
-                   .attr('xlink:href', name)
-                   .attr('class', useklass);
-           };
-       }
+           if (opt.silent) {
+             return '<p>An error occurred:</p><pre>' + escape$3(e.message + '', true) + '</pre>';
+           }
 
-       function uiNoteComments() {
-           var _note;
+           throw e;
+         }
+       };
+       /**
+        * Expose
+        */
 
 
-           function noteComments(selection) {
-               if (_note.isNew()) return; // don't draw .comments-container
+       marked.Parser = Parser_1;
+       marked.parser = Parser_1.parse;
+       marked.Renderer = Renderer_1;
+       marked.TextRenderer = TextRenderer_1;
+       marked.Lexer = Lexer_1;
+       marked.lexer = Lexer_1.lex;
+       marked.Tokenizer = Tokenizer_1;
+       marked.Slugger = Slugger_1;
+       marked.parse = marked;
+       var marked_1 = marked;
 
-               var comments = selection.selectAll('.comments-container')
-                   .data([0]);
+       var tiler$2 = utilTiler();
+       var dispatch$3 = dispatch('loaded');
+       var _tileZoom$2 = 14;
+       var _osmoseUrlRoot = 'https://osmose.openstreetmap.fr/api/0.3';
+       var _osmoseData = {
+         icons: {},
+         items: []
+       }; // This gets reassigned if reset
 
-               comments = comments.enter()
-                   .append('div')
-                   .attr('class', 'comments-container')
-                   .merge(comments);
+       var _cache$2;
 
-               var commentEnter = comments.selectAll('.comment')
-                   .data(_note.comments)
-                   .enter()
-                   .append('div')
-                   .attr('class', 'comment');
+       function abortRequest$2(controller) {
+         if (controller) {
+           controller.abort();
+         }
+       }
 
-               commentEnter
-                   .append('div')
-                   .attr('class', function(d) { return 'comment-avatar user-' + d.uid; })
-                   .call(svgIcon('#iD-icon-avatar', 'comment-avatar-icon'));
+       function abortUnwantedRequests$2(cache, tiles) {
+         Object.keys(cache.inflightTile).forEach(function (k) {
+           var wanted = tiles.find(function (tile) {
+             return k === tile.id;
+           });
 
-               var mainEnter = commentEnter
-                   .append('div')
-                   .attr('class', 'comment-main');
+           if (!wanted) {
+             abortRequest$2(cache.inflightTile[k]);
+             delete cache.inflightTile[k];
+           }
+         });
+       }
 
-               var metadataEnter = mainEnter
-                   .append('div')
-                   .attr('class', 'comment-metadata');
+       function encodeIssueRtree$2(d) {
+         return {
+           minX: d.loc[0],
+           minY: d.loc[1],
+           maxX: d.loc[0],
+           maxY: d.loc[1],
+           data: d
+         };
+       } // Replace or remove QAItem from rtree
 
-               metadataEnter
-                   .append('div')
-                   .attr('class', 'comment-author')
-                   .each(function(d) {
-                       var selection = select(this);
-                       var osm = services.osm;
-                       if (osm && d.user) {
-                           selection = selection
-                               .append('a')
-                               .attr('class', 'comment-author-link')
-                               .attr('href', osm.userURL(d.user))
-                               .attr('tabindex', -1)
-                               .attr('target', '_blank');
-                       }
-                       selection
-                           .text(function(d) { return d.user || _t('note.anonymous'); });
-                   });
 
-               metadataEnter
-                   .append('div')
-                   .attr('class', 'comment-date')
-                   .text(function(d) {
-                       return _t('note.status.' + d.action, { when: localeDateString(d.date) });
-                   });
+       function updateRtree$2(item, replace) {
+         _cache$2.rtree.remove(item, function (a, b) {
+           return a.data.id === b.data.id;
+         });
 
-               mainEnter
-                   .append('div')
-                   .attr('class', 'comment-text')
-                   .html(function(d) { return d.html; });
+         if (replace) {
+           _cache$2.rtree.insert(item);
+         }
+       } // Issues shouldn't obscure each other
 
-               comments
-                   .call(replaceAvatars);
-           }
 
+       function preventCoincident$1(loc) {
+         var coincident = false;
 
-           function replaceAvatars(selection) {
-               var showThirdPartyIcons = corePreferences('preferences.privacy.thirdpartyicons') || 'true';
-               var osm = services.osm;
-               if (showThirdPartyIcons !== 'true' || !osm) return;
+         do {
+           // first time, move marker up. after that, move marker right.
+           var delta = coincident ? [0.00001, 0] : [0, 0.00001];
+           loc = geoVecAdd(loc, delta);
+           var bbox = geoExtent(loc).bbox();
+           coincident = _cache$2.rtree.search(bbox).length;
+         } while (coincident);
 
-               var uids = {};  // gather uids in the comment thread
-               _note.comments.forEach(function(d) {
-                   if (d.uid) uids[d.uid] = true;
-               });
+         return loc;
+       }
 
-               Object.keys(uids).forEach(function(uid) {
-                   osm.loadUser(uid, function(err, user) {
-                       if (!user || !user.image_url) return;
+       var serviceOsmose = {
+         title: 'osmose',
+         init: function init() {
+           _mainFileFetcher.get('qa_data').then(function (d) {
+             _osmoseData = d.osmose;
+             _osmoseData.items = Object.keys(d.osmose.icons).map(function (s) {
+               return s.split('-')[0];
+             }).reduce(function (unique, item) {
+               return unique.indexOf(item) !== -1 ? unique : [].concat(_toConsumableArray(unique), [item]);
+             }, []);
+           });
 
-                       selection.selectAll('.comment-avatar.user-' + uid)
-                           .html('')
-                           .append('img')
-                           .attr('class', 'icon comment-avatar-icon')
-                           .attr('src', user.image_url)
-                           .attr('alt', user.display_name);
-                   });
-               });
+           if (!_cache$2) {
+             this.reset();
            }
 
+           this.event = utilRebind(this, dispatch$3, 'on');
+         },
+         reset: function reset() {
+           var _strings = {};
+           var _colors = {};
 
-           function localeDateString(s) {
-               if (!s) return null;
-               var options = { day: 'numeric', month: 'short', year: 'numeric' };
-               s = s.replace(/-/g, '/'); // fix browser-specific Date() issues
-               var d = new Date(s);
-               if (isNaN(d.getTime())) return null;
-               return d.toLocaleDateString(_mainLocalizer.localeCode(), options);
-           }
+           if (_cache$2) {
+             Object.values(_cache$2.inflightTile).forEach(abortRequest$2); // Strings and colors are static and should not be re-populated
 
+             _strings = _cache$2.strings;
+             _colors = _cache$2.colors;
+           }
 
-           noteComments.note = function(val) {
-               if (!arguments.length) return _note;
-               _note = val;
-               return noteComments;
+           _cache$2 = {
+             data: {},
+             loadedTile: {},
+             inflightTile: {},
+             inflightPost: {},
+             closed: {},
+             rtree: new RBush(),
+             strings: _strings,
+             colors: _colors
            };
+         },
+         loadIssues: function loadIssues(projection) {
+           var _this = this;
 
+           var params = {
+             // Tiles return a maximum # of issues
+             // So we want to filter our request for only types iD supports
+             item: _osmoseData.items
+           }; // determine the needed tiles to cover the view
 
-           return noteComments;
-       }
+           var tiles = tiler$2.zoomExtent([_tileZoom$2, _tileZoom$2]).getTiles(projection); // abort inflight requests that are no longer needed
 
-       function uiNoteHeader() {
-           var _note;
+           abortUnwantedRequests$2(_cache$2, tiles); // issue new requests..
 
+           tiles.forEach(function (tile) {
+             if (_cache$2.loadedTile[tile.id] || _cache$2.inflightTile[tile.id]) return;
 
-           function noteHeader(selection) {
-               var header = selection.selectAll('.note-header')
-                   .data(
-                       (_note ? [_note] : []),
-                       function(d) { return d.status + d.id; }
-                   );
+             var _tile$xyz = _slicedToArray(tile.xyz, 3),
+                 x = _tile$xyz[0],
+                 y = _tile$xyz[1],
+                 z = _tile$xyz[2];
 
-               header.exit()
-                   .remove();
+             var url = "".concat(_osmoseUrlRoot, "/issues/").concat(z, "/").concat(x, "/").concat(y, ".json?") + utilQsString(params);
+             var controller = new AbortController();
+             _cache$2.inflightTile[tile.id] = controller;
+             d3_json(url, {
+               signal: controller.signal
+             }).then(function (data) {
+               delete _cache$2.inflightTile[tile.id];
+               _cache$2.loadedTile[tile.id] = true;
+
+               if (data.features) {
+                 data.features.forEach(function (issue) {
+                   var _issue$properties = issue.properties,
+                       item = _issue$properties.item,
+                       cl = _issue$properties["class"],
+                       id = _issue$properties.uuid;
+                   /* Osmose issues are uniquely identified by a unique
+                     `item` and `class` combination (both integer values) */
+
+                   var itemType = "".concat(item, "-").concat(cl); // Filter out unsupported issue types (some are too specific or advanced)
+
+                   if (itemType in _osmoseData.icons) {
+                     var loc = issue.geometry.coordinates; // lon, lat
+
+                     loc = preventCoincident$1(loc);
+                     var d = new QAItem(loc, _this, itemType, id, {
+                       item: item
+                     }); // Setting elems here prevents UI detail requests
+
+                     if (item === 8300 || item === 8360) {
+                       d.elems = [];
+                     }
 
-               var headerEnter = header.enter()
-                   .append('div')
-                   .attr('class', 'note-header');
+                     _cache$2.data[d.id] = d;
 
-               var iconEnter = headerEnter
-                   .append('div')
-                   .attr('class', function(d) { return 'note-header-icon ' + d.status; })
-                   .classed('new', function(d) { return d.id < 0; });
+                     _cache$2.rtree.insert(encodeIssueRtree$2(d));
+                   }
+                 });
+               }
 
-               iconEnter
-                   .append('div')
-                   .attr('class', 'preset-icon-28')
-                   .call(svgIcon('#iD-icon-note', 'note-fill'));
-
-               iconEnter.each(function(d) {
-                   var statusIcon = '#iD-icon-' + (d.id < 0 ? 'plus' : (d.status === 'open' ? 'close' : 'apply'));
-                   iconEnter
-                       .append('div')
-                       .attr('class', 'note-icon-annotation')
-                       .call(svgIcon(statusIcon, 'icon-annotation'));
-               });
+               dispatch$3.call('loaded');
+             })["catch"](function () {
+               delete _cache$2.inflightTile[tile.id];
+               _cache$2.loadedTile[tile.id] = true;
+             });
+           });
+         },
+         loadIssueDetail: function loadIssueDetail(issue) {
+           var _this2 = this;
 
-               headerEnter
-                   .append('div')
-                   .attr('class', 'note-header-label')
-                   .text(function(d) {
-                       if (_note.isNew()) { return _t('note.new'); }
-                       return _t('note.note') + ' ' + d.id + ' ' +
-                           (d.status === 'closed' ? _t('note.closed') : '');
-                   });
+           // Issue details only need to be fetched once
+           if (issue.elems !== undefined) {
+             return Promise.resolve(issue);
            }
 
+           var url = "".concat(_osmoseUrlRoot, "/issue/").concat(issue.id, "?langs=").concat(_mainLocalizer.localeCode());
+
+           var cacheDetails = function cacheDetails(data) {
+             // Associated elements used for highlighting
+             // Assign directly for immediate use in the callback
+             issue.elems = data.elems.map(function (e) {
+               return e.type.substring(0, 1) + e.id;
+             }); // Some issues have instance specific detail in a subtitle
+
+             issue.detail = data.subtitle ? marked_1(data.subtitle.auto) : '';
 
-           noteHeader.note = function(val) {
-               if (!arguments.length) return _note;
-               _note = val;
-               return noteHeader;
+             _this2.replaceItem(issue);
            };
 
+           return d3_json(url).then(cacheDetails).then(function () {
+             return issue;
+           });
+         },
+         loadStrings: function loadStrings() {
+           var locale = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : _mainLocalizer.localeCode();
+           var items = Object.keys(_osmoseData.icons);
 
-           return noteHeader;
-       }
+           if (locale in _cache$2.strings && Object.keys(_cache$2.strings[locale]).length === items.length) {
+             return Promise.resolve(_cache$2.strings[locale]);
+           } // May be partially populated already if some requests were successful
 
-       function uiNoteReport() {
-           var _note;
 
-           function noteReport(selection) {
-               var url;
-               if (services.osm && (_note instanceof osmNote) && (!_note.isNew())) {
-                   url = services.osm.noteReportURL(_note);
-               }
+           if (!(locale in _cache$2.strings)) {
+             _cache$2.strings[locale] = {};
+           } // Only need to cache strings for supported issue types
+           // Using multiple individual item + class requests to reduce fetched data size
 
-               var link = selection.selectAll('.note-report')
-                   .data(url ? [url] : []);
 
-               // exit
-               link.exit()
-                   .remove();
+           var allRequests = items.map(function (itemType) {
+             // No need to request data we already have
+             if (itemType in _cache$2.strings[locale]) return null;
 
-               // enter
-               var linkEnter = link.enter()
-                   .append('a')
-                   .attr('class', 'note-report')
-                   .attr('target', '_blank')
-                   .attr('href', function(d) { return d; })
-                   .call(svgIcon('#iD-icon-out-link', 'inline'));
+             var cacheData = function cacheData(data) {
+               // Bunch of nested single value arrays of objects
+               var _data$categories = _slicedToArray(data.categories, 1),
+                   _data$categories$ = _data$categories[0],
+                   cat = _data$categories$ === void 0 ? {
+                 items: []
+               } : _data$categories$;
 
-               linkEnter
-                   .append('span')
-                   .text(_t('note.report'));
-           }
+               var _cat$items = _slicedToArray(cat.items, 1),
+                   _cat$items$ = _cat$items[0],
+                   item = _cat$items$ === void 0 ? {
+                 "class": []
+               } : _cat$items$;
 
+               var _item$class = _slicedToArray(item["class"], 1),
+                   _item$class$ = _item$class[0],
+                   cl = _item$class$ === void 0 ? null : _item$class$; // If null default value is reached, data wasn't as expected (or was empty)
 
-           noteReport.note = function(val) {
-               if (!arguments.length) return _note;
-               _note = val;
-               return noteReport;
-           };
 
-           return noteReport;
-       }
+               if (!cl) {
+                 /* eslint-disable no-console */
+                 console.log("Osmose strings request (".concat(itemType, ") had unexpected data"));
+                 /* eslint-enable no-console */
 
-       function uiViewOnOSM(context) {
-           var _what;   // an osmEntity or osmNote
+                 return;
+               } // Cache served item colors to automatically style issue markers later
 
 
-           function viewOnOSM(selection) {
-               var url;
-               if (_what instanceof osmEntity) {
-                   url = context.connection().entityURL(_what);
-               } else if (_what instanceof osmNote) {
-                   url = context.connection().noteURL(_what);
-               }
+               var itemInt = item.item,
+                   color = item.color;
 
-               var data = ((!_what || _what.isNew()) ? [] : [_what]);
-               var link = selection.selectAll('.view-on-osm')
-                   .data(data, function(d) { return d.id; });
+               if (/^#[A-Fa-f0-9]{6}|[A-Fa-f0-9]{3}/.test(color)) {
+                 _cache$2.colors[itemInt] = color;
+               } // Value of root key will be null if no string exists
+               // If string exists, value is an object with key 'auto' for string
 
-               // exit
-               link.exit()
-                   .remove();
 
-               // enter
-               var linkEnter = link.enter()
-                   .append('a')
-                   .attr('class', 'view-on-osm')
-                   .attr('target', '_blank')
-                   .attr('href', url)
-                   .call(svgIcon('#iD-icon-out-link', 'inline'));
+               var title = cl.title,
+                   detail = cl.detail,
+                   fix = cl.fix,
+                   trap = cl.trap; // Osmose titles shouldn't contain markdown
 
-               linkEnter
-                   .append('span')
-                   .text(_t('inspector.view_on_osm'));
-           }
+               var issueStrings = {};
+               if (title) issueStrings.title = title.auto;
+               if (detail) issueStrings.detail = marked_1(detail.auto);
+               if (trap) issueStrings.trap = marked_1(trap.auto);
+               if (fix) issueStrings.fix = marked_1(fix.auto);
+               _cache$2.strings[locale][itemType] = issueStrings;
+             };
 
+             var _itemType$split = itemType.split('-'),
+                 _itemType$split2 = _slicedToArray(_itemType$split, 2),
+                 item = _itemType$split2[0],
+                 cl = _itemType$split2[1]; // Osmose API falls back to English strings where untranslated or if locale doesn't exist
 
-           viewOnOSM.what = function(_) {
-               if (!arguments.length) return _what;
-               _what = _;
-               return viewOnOSM;
-           };
 
-           return viewOnOSM;
-       }
+             var url = "".concat(_osmoseUrlRoot, "/items/").concat(item, "/class/").concat(cl, "?langs=").concat(locale);
+             return d3_json(url).then(cacheData);
+           }).filter(Boolean);
+           return Promise.all(allRequests).then(function () {
+             return _cache$2.strings[locale];
+           });
+         },
+         getStrings: function getStrings(itemType) {
+           var locale = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : _mainLocalizer.localeCode();
+           // No need to fallback to English, Osmose API handles this for us
+           return locale in _cache$2.strings ? _cache$2.strings[locale][itemType] : {};
+         },
+         getColor: function getColor(itemType) {
+           return itemType in _cache$2.colors ? _cache$2.colors[itemType] : '#FFFFFF';
+         },
+         postUpdate: function postUpdate(issue, callback) {
+           var _this3 = this;
 
-       function uiNoteEditor(context) {
-           var dispatch$1 = dispatch('change');
-           var noteComments = uiNoteComments();
-           var noteHeader = uiNoteHeader();
+           if (_cache$2.inflightPost[issue.id]) {
+             return callback({
+               message: 'Issue update already inflight',
+               status: -2
+             }, issue);
+           } // UI sets the status to either 'done' or 'false'
 
-           // var formFields = uiFormFields(context);
 
-           var _note;
-           var _newNote;
-           // var _fieldsArr;
+           var url = "".concat(_osmoseUrlRoot, "/issue/").concat(issue.id, "/").concat(issue.newStatus);
+           var controller = new AbortController();
 
+           var after = function after() {
+             delete _cache$2.inflightPost[issue.id];
 
-           function noteEditor(selection) {
+             _this3.removeItem(issue);
 
-               var header = selection.selectAll('.header')
-                   .data([0]);
+             if (issue.newStatus === 'done') {
+               // Keep track of the number of issues closed per `item` to tag the changeset
+               if (!(issue.item in _cache$2.closed)) {
+                 _cache$2.closed[issue.item] = 0;
+               }
 
-               var headerEnter = header.enter()
-                   .append('div')
-                   .attr('class', 'header fillL');
+               _cache$2.closed[issue.item] += 1;
+             }
 
-               headerEnter
-                   .append('button')
-                   .attr('class', 'close')
-                   .on('click', function() {
-                       context.enter(modeBrowse(context));
-                   })
-                   .call(svgIcon('#iD-icon-close'));
+             if (callback) callback(null, issue);
+           };
 
-               headerEnter
-                   .append('h3')
-                   .text(_t('note.title'));
+           _cache$2.inflightPost[issue.id] = controller;
+           fetch(url, {
+             signal: controller.signal
+           }).then(after)["catch"](function (err) {
+             delete _cache$2.inflightPost[issue.id];
+             if (callback) callback(err.message);
+           });
+         },
+         // Get all cached QAItems covering the viewport
+         getItems: function getItems(projection) {
+           var viewport = projection.clipExtent();
+           var min = [viewport[0][0], viewport[1][1]];
+           var max = [viewport[1][0], viewport[0][1]];
+           var bbox = geoExtent(projection.invert(min), projection.invert(max)).bbox();
+           return _cache$2.rtree.search(bbox).map(function (d) {
+             return d.data;
+           });
+         },
+         // Get a QAItem from cache
+         // NOTE: Don't change method name until UI v3 is merged
+         getError: function getError(id) {
+           return _cache$2.data[id];
+         },
+         // get the name of the icon to display for this item
+         getIcon: function getIcon(itemType) {
+           return _osmoseData.icons[itemType];
+         },
+         // Replace a single QAItem in the cache
+         replaceItem: function replaceItem(item) {
+           if (!(item instanceof QAItem) || !item.id) return;
+           _cache$2.data[item.id] = item;
+           updateRtree$2(encodeIssueRtree$2(item), true); // true = replace
 
+           return item;
+         },
+         // Remove a single QAItem from the cache
+         removeItem: function removeItem(item) {
+           if (!(item instanceof QAItem) || !item.id) return;
+           delete _cache$2.data[item.id];
+           updateRtree$2(encodeIssueRtree$2(item), false); // false = remove
+         },
+         // Used to populate `closed:osmose:*` changeset tags
+         getClosedCounts: function getClosedCounts() {
+           return _cache$2.closed;
+         },
+         itemURL: function itemURL(item) {
+           return "https://osmose.openstreetmap.fr/en/error/".concat(item.id);
+         }
+       };
 
-               var body = selection.selectAll('.body')
-                   .data([0]);
+       var apibase = 'https://a.mapillary.com/v3/';
+       var viewercss = 'mapillary-js/mapillary.min.css';
+       var viewerjs = 'mapillary-js/mapillary.min.js';
+       var clientId = 'NzNRM2otQkR2SHJzaXJmNmdQWVQ0dzo1ZWYyMmYwNjdmNDdlNmVi';
+       var mapFeatureConfig = {
+         values: ['construction--flat--crosswalk-plain', 'marking--discrete--crosswalk-zebra', 'object--banner', 'object--bench', 'object--bike-rack', 'object--billboard', 'object--catch-basin', 'object--cctv-camera', 'object--fire-hydrant', 'object--mailbox', 'object--manhole', 'object--phone-booth', 'object--sign--advertisement', 'object--sign--information', 'object--sign--store', 'object--street-light', 'object--support--utility-pole', 'object--traffic-light--*', 'object--traffic-light--pedestrians', 'object--trash-can'].join(',')
+       };
+       var maxResults = 1000;
+       var tileZoom = 14;
+       var tiler$3 = utilTiler().zoomExtent([tileZoom, tileZoom]).skipNullIsland(true);
+       var dispatch$4 = dispatch('change', 'loadedImages', 'loadedSigns', 'loadedMapFeatures', 'bearingChanged', 'nodeChanged');
+       var _mlyFallback = false;
 
-               body = body.enter()
-                   .append('div')
-                   .attr('class', 'body')
-                   .merge(body);
+       var _mlyCache;
 
-               var editor = body.selectAll('.note-editor')
-                   .data([0]);
+       var _mlyClicks;
 
-               editor.enter()
-                   .append('div')
-                   .attr('class', 'modal-section note-editor')
-                   .merge(editor)
-                   .call(noteHeader.note(_note))
-                   .call(noteComments.note(_note))
-                   .call(noteSaveSection);
+       var _mlyActiveImage;
 
-               var footer = selection.selectAll('.footer')
-                   .data([0]);
+       var _mlySelectedImageKey;
 
-               footer.enter()
-                   .append('div')
-                   .attr('class', 'footer')
-                   .merge(footer)
-                   .call(uiViewOnOSM(context).what(_note))
-                   .call(uiNoteReport().note(_note));
+       var _mlyViewer;
 
+       var _mlyViewerFilter = ['all'];
 
-               // rerender the note editor on any auth change
-               var osm = services.osm;
-               if (osm) {
-                   osm.on('change.note-save', function() {
-                       selection.call(noteEditor);
-                   });
-               }
-           }
+       var _loadViewerPromise;
 
+       var _mlyHighlightedDetection;
 
-           function noteSaveSection(selection) {
-               var isSelected = (_note && _note.id === context.selectedNoteID());
-               var noteSave = selection.selectAll('.note-save')
-                   .data((isSelected ? [_note] : []), function(d) { return d.status + d.id; });
+       var _mlyShowFeatureDetections = false;
+       var _mlyShowSignDetections = false;
 
-               // exit
-               noteSave.exit()
-                   .remove();
+       function abortRequest$3(controller) {
+         controller.abort();
+       }
 
-               // enter
-               var noteSaveEnter = noteSave.enter()
-                   .append('div')
-                   .attr('class', 'note-save save-section cf');
-
-               // // if new note, show categories to pick from
-               // if (_note.isNew()) {
-               //     var presets = presetManager;
-
-               //     // NOTE: this key isn't a age and therefore there is no documentation (yet)
-               //     _fieldsArr = [
-               //         uiField(context, presets.field('category'), null, { show: true, revert: false }),
-               //     ];
-
-               //     _fieldsArr.forEach(function(field) {
-               //         field
-               //             .on('change', changeCategory);
-               //     });
-
-               //     noteSaveEnter
-               //         .append('div')
-               //         .attr('class', 'note-category')
-               //         .call(formFields.fieldsArr(_fieldsArr));
-               // }
-
-               // function changeCategory() {
-               //     // NOTE: perhaps there is a better way to get value
-               //     var val = context.container().select('input[name=\'category\']:checked').property('__data__') || undefined;
-
-               //     // store the unsaved category with the note itself
-               //     _note = _note.update({ newCategory: val });
-               //     var osm = services.osm;
-               //     if (osm) {
-               //         osm.replaceNote(_note);  // update note cache
-               //     }
-               //     noteSave
-               //         .call(noteSaveButtons);
-               // }
-
-               noteSaveEnter
-                   .append('h4')
-                   .attr('class', '.note-save-header')
-                   .text(function() {
-                       return _note.isNew() ? _t('note.newDescription') : _t('note.newComment');
-                   });
+       function loadTiles(which, url, projection) {
+         var currZoom = Math.floor(geoScaleToZoom(projection.scale()));
+         var tiles = tiler$3.getTiles(projection); // abort inflight requests that are no longer needed
 
-               var commentTextarea = noteSaveEnter
-                   .append('textarea')
-                   .attr('class', 'new-comment-input')
-                   .attr('placeholder', _t('note.inputPlaceholder'))
-                   .attr('maxlength', 1000)
-                   .property('value', function(d) { return d.newComment; })
-                   .call(utilNoAuto)
-                   .on('keydown.note-input', keydown)
-                   .on('input.note-input', changeInput)
-                   .on('blur.note-input', changeInput);
+         var cache = _mlyCache[which];
+         Object.keys(cache.inflight).forEach(function (k) {
+           var wanted = tiles.find(function (tile) {
+             return k.indexOf(tile.id + ',') === 0;
+           });
 
-               if (_newNote) {
-                   // autofocus the comment field for new notes
-                   commentTextarea.node().focus();
-               }
+           if (!wanted) {
+             abortRequest$3(cache.inflight[k]);
+             delete cache.inflight[k];
+           }
+         });
+         tiles.forEach(function (tile) {
+           loadNextTilePage(which, currZoom, url, tile);
+         });
+       }
 
-               // update
-               noteSave = noteSaveEnter
-                   .merge(noteSave)
-                   .call(userDetails)
-                   .call(noteSaveButtons);
+       function loadNextTilePage(which, currZoom, url, tile) {
+         var cache = _mlyCache[which];
+         var rect = tile.extent.rectangle();
+         var maxPages = maxPageAtZoom(currZoom);
+         var nextPage = cache.nextPage[tile.id] || 0;
+         var nextURL = cache.nextURL[tile.id] || url + utilQsString({
+           per_page: maxResults,
+           page: nextPage,
+           client_id: clientId,
+           bbox: [rect[0], rect[1], rect[2], rect[3]].join(',')
+         });
+         if (nextPage > maxPages) return;
+         var id = tile.id + ',' + String(nextPage);
+         if (cache.loaded[id] || cache.inflight[id]) return;
+         var controller = new AbortController();
+         cache.inflight[id] = controller;
+         var options = {
+           method: 'GET',
+           signal: controller.signal,
+           headers: {
+             'Content-Type': 'application/json'
+           }
+         };
+         fetch(nextURL, options).then(function (response) {
+           if (!response.ok) {
+             throw new Error(response.status + ' ' + response.statusText);
+           }
 
+           var linkHeader = response.headers.get('Link');
 
-               // fast submit if user presses cmd+enter
-               function keydown() {
-                   if (!(event.keyCode === 13 && event.metaKey)) return;
+           if (linkHeader) {
+             var pagination = parsePagination(linkHeader);
 
-                   var osm = services.osm;
-                   if (!osm) return;
+             if (pagination.next) {
+               cache.nextURL[tile.id] = pagination.next;
+             }
+           }
 
-                   var hasAuth = osm.authenticated();
-                   if (!hasAuth) return;
+           return response.json();
+         }).then(function (data) {
+           cache.loaded[id] = true;
+           delete cache.inflight[id];
 
-                   if (!_note.newComment) return;
+           if (!data || !data.features || !data.features.length) {
+             throw new Error('No Data');
+           }
 
-                   event.preventDefault();
+           var features = data.features.map(function (feature) {
+             var loc = feature.geometry.coordinates;
+             var d; // An image (shown as a green dot on the map) is a single street photo with extra
+             // information such as location, camera angle (CA), camera model, and so on.
+             // Each image feature is a GeoJSON Point
 
-                   select(this)
-                       .on('keydown.note-input', null);
+             if (which === 'images') {
+               d = {
+                 loc: loc,
+                 key: feature.properties.key,
+                 ca: feature.properties.ca,
+                 captured_at: feature.properties.captured_at,
+                 captured_by: feature.properties.username,
+                 pano: feature.properties.pano
+               };
+               cache.forImageKey[d.key] = d; // cache imageKey -> image
+               // Mapillary organizes images as sequences. A sequence of images are continuously captured
+               // by a user at a give time. Sequences are shown on the map as green lines.
+               // Each sequence feature is a GeoJSON LineString
+             } else if (which === 'sequences') {
+               var sequenceKey = feature.properties.key;
+               cache.lineString[sequenceKey] = feature; // cache sequenceKey -> lineString
+
+               feature.properties.coordinateProperties.image_keys.forEach(function (imageKey) {
+                 cache.forImageKey[imageKey] = sequenceKey; // cache imageKey -> sequenceKey
+               });
+               return false; // because no `d` data worth loading into an rbush
+               // A map feature is a real world object that can be shown on a map. It could be any object
+               // recognized from images, manually added in images, or added on the map.
+               // Each map feature is a GeoJSON Point (located where the feature is)
+             } else if (which === 'map_features' || which === 'points') {
+               d = {
+                 loc: loc,
+                 key: feature.properties.key,
+                 value: feature.properties.value,
+                 detections: feature.properties.detections,
+                 direction: feature.properties.direction,
+                 accuracy: feature.properties.accuracy,
+                 first_seen_at: feature.properties.first_seen_at,
+                 last_seen_at: feature.properties.last_seen_at
+               };
+             }
 
-                   // focus on button and submit
-                   window.setTimeout(function() {
-                       if (_note.isNew()) {
-                           noteSave.selectAll('.save-button').node().focus();
-                           clickSave(_note);
-                       } else  {
-                           noteSave.selectAll('.comment-button').node().focus();
-                           clickComment(_note);
-                       }
-                   }, 10);
-               }
+             return {
+               minX: loc[0],
+               minY: loc[1],
+               maxX: loc[0],
+               maxY: loc[1],
+               data: d
+             };
+           }).filter(Boolean);
 
+           if (cache.rtree && features) {
+             cache.rtree.load(features);
+           }
 
-               function changeInput() {
-                   var input = select(this);
-                   var val = input.property('value').trim() || undefined;
+           if (data.features.length === maxResults) {
+             // more pages to load
+             cache.nextPage[tile.id] = nextPage + 1;
+             loadNextTilePage(which, currZoom, url, tile);
+           } else {
+             cache.nextPage[tile.id] = Infinity; // no more pages to load
+           }
 
-                   // store the unsaved comment with the note itself
-                   _note = _note.update({ newComment: val });
+           if (which === 'images' || which === 'sequences') {
+             dispatch$4.call('loadedImages');
+           } else if (which === 'map_features') {
+             dispatch$4.call('loadedSigns');
+           } else if (which === 'points') {
+             dispatch$4.call('loadedMapFeatures');
+           }
+         })["catch"](function () {
+           cache.loaded[id] = true;
+           delete cache.inflight[id];
+         });
+       }
 
-                   var osm = services.osm;
-                   if (osm) {
-                       osm.replaceNote(_note);  // update note cache
-                   }
+       function loadData(which, url) {
+         var cache = _mlyCache[which];
+         var options = {
+           method: 'GET',
+           headers: {
+             'Content-Type': 'application/json'
+           }
+         };
+         var nextUrl = url + '&client_id=' + clientId;
+         return fetch(nextUrl, options).then(function (response) {
+           if (!response.ok) {
+             throw new Error(response.status + ' ' + response.statusText);
+           }
 
-                   noteSave
-                       .call(noteSaveButtons);
-               }
+           return response.json();
+         }).then(function (data) {
+           if (!data || !data.features || !data.features.length) {
+             throw new Error('No Data');
            }
 
+           data.features.forEach(function (feature) {
+             var d;
 
-           function userDetails(selection) {
-               var detailSection = selection.selectAll('.detail-section')
-                   .data([0]);
+             if (which === 'image_detections') {
+               d = {
+                 key: feature.properties.key,
+                 image_key: feature.properties.image_key,
+                 value: feature.properties.value,
+                 shape: feature.properties.shape
+               };
 
-               detailSection = detailSection.enter()
-                   .append('div')
-                   .attr('class', 'detail-section')
-                   .merge(detailSection);
+               if (!cache.forImageKey[d.image_key]) {
+                 cache.forImageKey[d.image_key] = [];
+               }
 
-               var osm = services.osm;
-               if (!osm) return;
-
-               // Add warning if user is not logged in
-               var hasAuth = osm.authenticated();
-               var authWarning = detailSection.selectAll('.auth-warning')
-                   .data(hasAuth ? [] : [0]);
-
-               authWarning.exit()
-                   .transition()
-                   .duration(200)
-                   .style('opacity', 0)
-                   .remove();
-
-               var authEnter = authWarning.enter()
-                   .insert('div', '.tag-reference-body')
-                   .attr('class', 'field-warning auth-warning')
-                   .style('opacity', 0);
-
-               authEnter
-                   .call(svgIcon('#iD-icon-alert', 'inline'));
-
-               authEnter
-                   .append('span')
-                   .text(_t('note.login'));
-
-               authEnter
-                   .append('a')
-                   .attr('target', '_blank')
-                   .call(svgIcon('#iD-icon-out-link', 'inline'))
-                   .append('span')
-                   .text(_t('login'))
-                   .on('click.note-login', function() {
-                       event.preventDefault();
-                       osm.authenticate();
-                   });
+               cache.forImageKey[d.image_key].push(d);
+             }
+           });
+         });
+       }
 
-               authEnter
-                   .transition()
-                   .duration(200)
-                   .style('opacity', 1);
+       function maxPageAtZoom(z) {
+         if (z < 15) return 2;
+         if (z === 15) return 5;
+         if (z === 16) return 10;
+         if (z === 17) return 20;
+         if (z === 18) return 40;
+         if (z > 18) return 80;
+       } // extract links to pages of API results
 
 
-               var prose = detailSection.selectAll('.note-save-prose')
-                   .data(hasAuth ? [0] : []);
+       function parsePagination(links) {
+         return links.split(',').map(function (rel) {
+           var elements = rel.split(';');
 
-               prose.exit()
-                   .remove();
+           if (elements.length === 2) {
+             return [/<(.+)>/.exec(elements[0])[1], /rel="(.+)"/.exec(elements[1])[1]];
+           } else {
+             return ['', ''];
+           }
+         }).reduce(function (pagination, val) {
+           pagination[val[1]] = val[0];
+           return pagination;
+         }, {});
+       } // partition viewport into higher zoom tiles
 
-               prose = prose.enter()
-                   .append('p')
-                   .attr('class', 'note-save-prose')
-                   .text(_t('note.upload_explanation'))
-                   .merge(prose);
 
-               osm.userDetails(function(err, user) {
-                   if (err) return;
+       function partitionViewport(projection) {
+         var z = geoScaleToZoom(projection.scale());
+         var z2 = Math.ceil(z * 2) / 2 + 2.5; // round to next 0.5 and add 2.5
 
-                   var userLink = select(document.createElement('div'));
+         var tiler = utilTiler().zoomExtent([z2, z2]);
+         return tiler.getTiles(projection).map(function (tile) {
+           return tile.extent;
+         });
+       } // no more than `limit` results per partition.
 
-                   if (user.image_url) {
-                       userLink
-                           .append('img')
-                           .attr('src', user.image_url)
-                           .attr('class', 'icon pre-text user-icon');
-                   }
 
-                   userLink
-                       .append('a')
-                       .attr('class', 'user-info')
-                       .text(user.display_name)
-                       .attr('href', osm.userURL(user.display_name))
-                       .attr('tabindex', -1)
-                       .attr('target', '_blank');
+       function searchLimited(limit, projection, rtree) {
+         limit = limit || 5;
+         return partitionViewport(projection).reduce(function (result, extent) {
+           var found = rtree.search(extent.bbox()).slice(0, limit).map(function (d) {
+             return d.data;
+           });
+           return found.length ? result.concat(found) : result;
+         }, []);
+       }
 
-                   prose
-                       .html(_t('note.upload_explanation_with_user', { user: userLink.html() }));
-               });
+       var serviceMapillary = {
+         init: function init() {
+           if (!_mlyCache) {
+             this.reset();
            }
 
+           this.event = utilRebind(this, dispatch$4, 'on');
+         },
+         reset: function reset() {
+           if (_mlyCache) {
+             Object.values(_mlyCache.images.inflight).forEach(abortRequest$3);
+             Object.values(_mlyCache.image_detections.inflight).forEach(abortRequest$3);
+             Object.values(_mlyCache.map_features.inflight).forEach(abortRequest$3);
+             Object.values(_mlyCache.points.inflight).forEach(abortRequest$3);
+             Object.values(_mlyCache.sequences.inflight).forEach(abortRequest$3);
+           }
+
+           _mlyCache = {
+             images: {
+               inflight: {},
+               loaded: {},
+               nextPage: {},
+               nextURL: {},
+               rtree: new RBush(),
+               forImageKey: {}
+             },
+             image_detections: {
+               inflight: {},
+               loaded: {},
+               nextPage: {},
+               nextURL: {},
+               forImageKey: {}
+             },
+             map_features: {
+               inflight: {},
+               loaded: {},
+               nextPage: {},
+               nextURL: {},
+               rtree: new RBush()
+             },
+             points: {
+               inflight: {},
+               loaded: {},
+               nextPage: {},
+               nextURL: {},
+               rtree: new RBush()
+             },
+             sequences: {
+               inflight: {},
+               loaded: {},
+               nextPage: {},
+               nextURL: {},
+               rtree: new RBush(),
+               forImageKey: {},
+               lineString: {}
+             }
+           };
+           _mlySelectedImageKey = null;
+           _mlyActiveImage = null;
+           _mlyClicks = [];
+         },
+         images: function images(projection) {
+           var limit = 5;
+           return searchLimited(limit, projection, _mlyCache.images.rtree);
+         },
+         signs: function signs(projection) {
+           var limit = 5;
+           return searchLimited(limit, projection, _mlyCache.map_features.rtree);
+         },
+         mapFeatures: function mapFeatures(projection) {
+           var limit = 5;
+           return searchLimited(limit, projection, _mlyCache.points.rtree);
+         },
+         cachedImage: function cachedImage(imageKey) {
+           return _mlyCache.images.forImageKey[imageKey];
+         },
+         sequences: function sequences(projection) {
+           var viewport = projection.clipExtent();
+           var min = [viewport[0][0], viewport[1][1]];
+           var max = [viewport[1][0], viewport[0][1]];
+           var bbox = geoExtent(projection.invert(min), projection.invert(max)).bbox();
+           var sequenceKeys = {}; // all sequences for images in viewport
 
-           function noteSaveButtons(selection) {
-               var osm = services.osm;
-               var hasAuth = osm && osm.authenticated();
+           _mlyCache.images.rtree.search(bbox).forEach(function (d) {
+             var sequenceKey = _mlyCache.sequences.forImageKey[d.data.key];
 
-               var isSelected = (_note && _note.id === context.selectedNoteID());
-               var buttonSection = selection.selectAll('.buttons')
-                   .data((isSelected ? [_note] : []), function(d) { return d.status + d.id; });
+             if (sequenceKey) {
+               sequenceKeys[sequenceKey] = true;
+             }
+           }); // Return lineStrings for the sequences
 
-               // exit
-               buttonSection.exit()
-                   .remove();
 
-               // enter
-               var buttonEnter = buttonSection.enter()
-                   .append('div')
-                   .attr('class', 'buttons');
+           return Object.keys(sequenceKeys).map(function (sequenceKey) {
+             return _mlyCache.sequences.lineString[sequenceKey];
+           });
+         },
+         signsSupported: function signsSupported() {
+           return true;
+         },
+         loadImages: function loadImages(projection) {
+           loadTiles('images', apibase + 'images?sort_by=key&', projection);
+           loadTiles('sequences', apibase + 'sequences?sort_by=key&', projection);
+         },
+         loadSigns: function loadSigns(projection) {
+           loadTiles('map_features', apibase + 'map_features?layers=trafficsigns&min_nbr_image_detections=2&sort_by=key&', projection);
+         },
+         loadMapFeatures: function loadMapFeatures(projection) {
+           loadTiles('points', apibase + 'map_features?layers=points&min_nbr_image_detections=2&sort_by=key&values=' + mapFeatureConfig.values + '&', projection);
+         },
+         ensureViewerLoaded: function ensureViewerLoaded(context) {
+           if (_loadViewerPromise) return _loadViewerPromise; // add mly-wrapper
 
-               if (_note.isNew()) {
-                   buttonEnter
-                       .append('button')
-                       .attr('class', 'button cancel-button secondary-action')
-                       .text(_t('confirm.cancel'));
+           var wrap = context.container().select('.photoviewer').selectAll('.mly-wrapper').data([0]);
+           wrap.enter().append('div').attr('id', 'ideditor-mly').attr('class', 'photo-wrapper mly-wrapper').classed('hide', true);
+           var that = this;
+           _loadViewerPromise = new Promise(function (resolve, reject) {
+             var loadedCount = 0;
 
-                   buttonEnter
-                       .append('button')
-                       .attr('class', 'button save-button action')
-                       .text(_t('note.save'));
+             function loaded() {
+               loadedCount += 1; // wait until both files are loaded
 
-               } else {
-                   buttonEnter
-                       .append('button')
-                       .attr('class', 'button status-button action');
+               if (loadedCount === 2) resolve();
+             }
 
-                   buttonEnter
-                       .append('button')
-                       .attr('class', 'button comment-button action')
-                       .text(_t('note.comment'));
-               }
+             var head = select('head'); // load mapillary-viewercss
 
+             head.selectAll('#ideditor-mapillary-viewercss').data([0]).enter().append('link').attr('id', 'ideditor-mapillary-viewercss').attr('rel', 'stylesheet').attr('crossorigin', 'anonymous').attr('href', context.asset(viewercss)).on('load.serviceMapillary', loaded).on('error.serviceMapillary', function () {
+               reject();
+             }); // load mapillary-viewerjs
 
-               // update
-               buttonSection = buttonSection
-                   .merge(buttonEnter);
+             head.selectAll('#ideditor-mapillary-viewerjs').data([0]).enter().append('script').attr('id', 'ideditor-mapillary-viewerjs').attr('crossorigin', 'anonymous').attr('src', context.asset(viewerjs)).on('load.serviceMapillary', loaded).on('error.serviceMapillary', function () {
+               reject();
+             });
+           })["catch"](function () {
+             _loadViewerPromise = null;
+           }).then(function () {
+             that.initViewer(context);
+           });
+           return _loadViewerPromise;
+         },
+         loadSignResources: function loadSignResources(context) {
+           context.ui().svgDefs.addSprites(['mapillary-sprite'], false
+           /* don't override colors */
+           );
+           return this;
+         },
+         loadObjectResources: function loadObjectResources(context) {
+           context.ui().svgDefs.addSprites(['mapillary-object-sprite'], false
+           /* don't override colors */
+           );
+           return this;
+         },
+         resetTags: function resetTags() {
+           if (_mlyViewer && !_mlyFallback) {
+             _mlyViewer.getComponent('tag').removeAll(); // remove previous detections
 
-               buttonSection.select('.cancel-button')   // select and propagate data
-                   .on('click.cancel', clickCancel);
+           }
+         },
+         showFeatureDetections: function showFeatureDetections(value) {
+           _mlyShowFeatureDetections = value;
 
-               buttonSection.select('.save-button')     // select and propagate data
-                   .attr('disabled', isSaveDisabled)
-                   .on('click.save', clickSave);
+           if (!_mlyShowFeatureDetections && !_mlyShowSignDetections) {
+             this.resetTags();
+           }
+         },
+         showSignDetections: function showSignDetections(value) {
+           _mlyShowSignDetections = value;
 
-               buttonSection.select('.status-button')   // select and propagate data
-                   .attr('disabled', (hasAuth ? null : true))
-                   .text(function(d) {
-                       var action = (d.status === 'open' ? 'close' : 'open');
-                       var andComment = (d.newComment ? '_comment' : '');
-                       return _t('note.' + action + andComment);
-                   })
-                   .on('click.status', clickStatus);
+           if (!_mlyShowFeatureDetections && !_mlyShowSignDetections) {
+             this.resetTags();
+           }
+         },
+         filterViewer: function filterViewer(context) {
+           var showsPano = context.photos().showsPanoramic();
+           var showsFlat = context.photos().showsFlat();
+           var fromDate = context.photos().fromDate();
+           var toDate = context.photos().toDate();
+           var usernames = context.photos().usernames();
+           var filter = ['all'];
+           if (!showsPano) filter.push(['==', 'pano', false]);
+           if (!showsFlat && showsPano) filter.push(['==', 'pano', true]);
+           if (usernames && usernames.length) filter.push(['==', 'username', usernames[0]]);
 
-               buttonSection.select('.comment-button')   // select and propagate data
-                   .attr('disabled', isSaveDisabled)
-                   .on('click.comment', clickComment);
+           if (fromDate) {
+             var fromTimestamp = new Date(fromDate).getTime();
+             filter.push(['>=', 'capturedAt', fromTimestamp]);
+           }
 
+           if (toDate) {
+             var toTimestamp = new Date(toDate).getTime();
+             filter.push(['>=', 'capturedAt', toTimestamp]);
+           }
 
-               function isSaveDisabled(d) {
-                   return (hasAuth && d.status === 'open' && d.newComment) ? null : true;
-               }
+           if (_mlyViewer) {
+             _mlyViewer.setFilter(filter);
            }
 
+           _mlyViewerFilter = filter;
+           return filter;
+         },
+         showViewer: function showViewer(context) {
+           var wrap = context.container().select('.photoviewer').classed('hide', false);
+           var isHidden = wrap.selectAll('.photo-wrapper.mly-wrapper.hide').size();
 
+           if (isHidden && _mlyViewer) {
+             wrap.selectAll('.photo-wrapper:not(.mly-wrapper)').classed('hide', true);
+             wrap.selectAll('.photo-wrapper.mly-wrapper').classed('hide', false);
 
-           function clickCancel(d) {
-               this.blur();    // avoid keeping focus on the button - #4641
-               var osm = services.osm;
-               if (osm) {
-                   osm.removeNote(d);
-               }
-               context.enter(modeBrowse(context));
-               dispatch$1.call('change');
+             _mlyViewer.resize();
            }
 
+           return this;
+         },
+         hideViewer: function hideViewer(context) {
+           _mlyActiveImage = null;
+           _mlySelectedImageKey = null;
 
-           function clickSave(d) {
-               this.blur();    // avoid keeping focus on the button - #4641
-               var osm = services.osm;
-               if (osm) {
-                   osm.postNoteCreate(d, function(err, note) {
-                       dispatch$1.call('change', note);
-                   });
-               }
+           if (!_mlyFallback && _mlyViewer) {
+             _mlyViewer.getComponent('sequence').stop();
            }
 
+           var viewer = context.container().select('.photoviewer');
+           if (!viewer.empty()) viewer.datum(null);
+           viewer.classed('hide', true).selectAll('.photo-wrapper').classed('hide', true);
+           this.updateUrlImage(null);
+           dispatch$4.call('nodeChanged');
+           return this.setStyles(context, null, true);
+         },
+         parsePagination: parsePagination,
+         updateUrlImage: function updateUrlImage(imageKey) {
+           if (!window.mocha) {
+             var hash = utilStringQs(window.location.hash);
+
+             if (imageKey) {
+               hash.photo = 'mapillary/' + imageKey;
+             } else {
+               delete hash.photo;
+             }
 
-           function clickStatus(d) {
-               this.blur();    // avoid keeping focus on the button - #4641
-               var osm = services.osm;
-               if (osm) {
-                   var setStatus = (d.status === 'open' ? 'closed' : 'open');
-                   osm.postNoteUpdate(d, setStatus, function(err, note) {
-                       dispatch$1.call('change', note);
-                   });
-               }
+             window.location.replace('#' + utilQsString(hash, true));
            }
-
-           function clickComment(d) {
-               this.blur();    // avoid keeping focus on the button - #4641
-               var osm = services.osm;
-               if (osm) {
-                   osm.postNoteUpdate(d, d.status, function(err, note) {
-                       dispatch$1.call('change', note);
-                   });
-               }
+         },
+         highlightDetection: function highlightDetection(detection) {
+           if (detection) {
+             _mlyHighlightedDetection = detection.detection_key;
            }
 
+           return this;
+         },
+         initViewer: function initViewer(context) {
+           var that = this;
+           if (!window.Mapillary) return;
+           var opts = {
+             baseImageSize: 320,
+             component: {
+               cover: false,
+               keyboard: false,
+               tag: true
+             }
+           }; // Disable components requiring WebGL support
+
+           if (!Mapillary.isSupported() && Mapillary.isFallbackSupported()) {
+             _mlyFallback = true;
+             opts.component = {
+               cover: false,
+               direction: false,
+               imagePlane: false,
+               keyboard: false,
+               mouse: false,
+               sequence: false,
+               tag: false,
+               image: true,
+               // fallback
+               navigation: true // fallback
 
-           noteEditor.note = function(val) {
-               if (!arguments.length) return _note;
-               _note = val;
-               return noteEditor;
-           };
+             };
+           }
 
-           noteEditor.newNote = function(val) {
-               if (!arguments.length) return _newNote;
-               _newNote = val;
-               return noteEditor;
-           };
+           _mlyViewer = new Mapillary.Viewer('ideditor-mly', clientId, null, opts);
 
+           _mlyViewer.on('nodechanged', nodeChanged);
 
-           return utilRebind(noteEditor, dispatch$1, 'on');
-       }
+           _mlyViewer.on('bearingchanged', bearingChanged);
 
-       function modeSelectNote(context, selectedNoteID) {
-           var mode = {
-               id: 'select-note',
-               button: 'browse'
-           };
+           if (_mlyViewerFilter) {
+             _mlyViewer.setFilter(_mlyViewerFilter);
+           } // Register viewer resize handler
 
-           var _keybinding = utilKeybinding('select-note');
-           var _noteEditor = uiNoteEditor(context)
-               .on('change', function() {
-                   context.map().pan([0,0]);  // trigger a redraw
-                   var note = checkSelectedID();
-                   if (!note) return;
-                   context.ui().sidebar
-                       .show(_noteEditor.note(note));
-               });
 
-           var _behaviors = [
-               behaviorBreathe(),
-               behaviorHover(context),
-               behaviorSelect(context),
-               behaviorLasso(context),
-               modeDragNode(context).behavior,
-               modeDragNote(context).behavior
-           ];
+           context.ui().photoviewer.on('resize.mapillary', function () {
+             if (_mlyViewer) _mlyViewer.resize();
+           }); // nodeChanged: called after the viewer has changed images and is ready.
+           //
+           // There is some logic here to batch up clicks into a _mlyClicks array
+           // because the user might click on a lot of markers quickly and nodechanged
+           // may be called out of order asynchronously.
+           //
+           // Clicks are added to the array in `selectedImage` and removed here.
+           //
 
-           var _newFeature = false;
+           function nodeChanged(node) {
+             that.resetTags();
+             var clicks = _mlyClicks;
+             var index = clicks.indexOf(node.key);
+             var selectedKey = _mlySelectedImageKey;
+             that.setActiveImage(node);
 
+             if (index > -1) {
+               // `nodechanged` initiated from clicking on a marker..
+               clicks.splice(index, 1); // remove the click
+               // If `node.key` matches the current _mlySelectedImageKey, call `selectImage()`
+               // one more time to update the detections and attribution..
 
-           function checkSelectedID() {
-               if (!services.osm) return;
-               var note = services.osm.getNote(selectedNoteID);
-               if (!note) {
-                   context.enter(modeBrowse(context));
+               if (node.key === selectedKey) {
+                 that.selectImage(context, _mlySelectedImageKey, true);
                }
-               return note;
-           }
+             } else {
+               // `nodechanged` initiated from the Mapillary viewer controls..
+               var loc = node.computedLatLon ? [node.computedLatLon.lon, node.computedLatLon.lat] : [node.latLon.lon, node.latLon.lat];
+               context.map().centerEase(loc);
+               that.selectImage(context, node.key, true);
+             }
 
+             dispatch$4.call('nodeChanged');
+           }
 
-           // class the note as selected, or return to browse mode if the note is gone
-           function selectNote(drawn) {
-               if (!checkSelectedID()) return;
+           function bearingChanged(e) {
+             dispatch$4.call('bearingChanged', undefined, e);
+           }
+         },
+         // Pass in the image key string as `imageKey`.
+         // This allows images to be selected from places that dont have access
+         // to the full image datum (like the street signs layer or the js viewer)
+         selectImage: function selectImage(context, imageKey, fromViewer) {
+           _mlySelectedImageKey = imageKey;
+           this.updateUrlImage(imageKey);
+           var d = _mlyCache.images.forImageKey[imageKey];
+           var viewer = context.container().select('.photoviewer');
+           if (!viewer.empty()) viewer.datum(d);
+           imageKey = d && d.key || imageKey;
 
-               var selection = context.surface().selectAll('.layer-notes .note-' + selectedNoteID);
+           if (!fromViewer && imageKey) {
+             _mlyClicks.push(imageKey);
+           }
 
-               if (selection.empty()) {
-                   // Return to browse mode if selected DOM elements have
-                   // disappeared because the user moved them out of view..
-                   var source = event && event.type === 'zoom' && event.sourceEvent;
-                   if (drawn && source && (source.type === 'pointermove' || source.type === 'mousemove' || source.type === 'touchmove')) {
-                       context.enter(modeBrowse(context));
-                   }
+           this.setStyles(context, null, true);
 
-               } else {
-                   selection
-                       .classed('selected', true);
+           if (_mlyShowFeatureDetections) {
+             this.updateDetections(imageKey, apibase + 'image_detections?layers=points&values=' + mapFeatureConfig.values + '&image_keys=' + imageKey);
+           }
 
-                   context.selectedNoteID(selectedNoteID);
-               }
+           if (_mlyShowSignDetections) {
+             this.updateDetections(imageKey, apibase + 'image_detections?layers=trafficsigns&image_keys=' + imageKey);
            }
 
+           if (_mlyViewer && imageKey) {
+             _mlyViewer.moveToKey(imageKey)["catch"](function (e) {
+               console.error('mly3', e);
+             }); // eslint-disable-line no-console
 
-           function esc() {
-               if (context.container().select('.combobox').size()) return;
-               context.enter(modeBrowse(context));
            }
 
+           return this;
+         },
+         getActiveImage: function getActiveImage() {
+           return _mlyActiveImage;
+         },
+         getSelectedImageKey: function getSelectedImageKey() {
+           return _mlySelectedImageKey;
+         },
+         getSequenceKeyForImageKey: function getSequenceKeyForImageKey(imageKey) {
+           return _mlyCache.sequences.forImageKey[imageKey];
+         },
+         setActiveImage: function setActiveImage(node) {
+           if (node) {
+             _mlyActiveImage = {
+               ca: node.originalCA,
+               key: node.key,
+               loc: [node.originalLatLon.lon, node.originalLatLon.lat],
+               pano: node.pano
+             };
+           } else {
+             _mlyActiveImage = null;
+           }
+         },
+         // Updates the currently highlighted sequence and selected bubble.
+         // Reset is only necessary when interacting with the viewport because
+         // this implicitly changes the currently selected bubble/sequence
+         setStyles: function setStyles(context, hovered, reset) {
+           if (reset) {
+             // reset all layers
+             context.container().selectAll('.viewfield-group').classed('highlighted', false).classed('hovered', false);
+             context.container().selectAll('.sequence').classed('highlighted', false).classed('currentView', false);
+           }
+
+           var hoveredImageKey = hovered && hovered.key;
+           var hoveredSequenceKey = hoveredImageKey && this.getSequenceKeyForImageKey(hoveredImageKey);
+           var hoveredLineString = hoveredSequenceKey && _mlyCache.sequences.lineString[hoveredSequenceKey];
+           var hoveredImageKeys = hoveredLineString && hoveredLineString.properties.coordinateProperties.image_keys || [];
+           var selectedImageKey = _mlySelectedImageKey;
+           var selectedSequenceKey = selectedImageKey && this.getSequenceKeyForImageKey(selectedImageKey);
+           var selectedLineString = selectedSequenceKey && _mlyCache.sequences.lineString[selectedSequenceKey];
+           var selectedImageKeys = selectedLineString && selectedLineString.properties.coordinateProperties.image_keys || []; // highlight sibling viewfields on either the selected or the hovered sequences
+
+           var highlightedImageKeys = utilArrayUnion(hoveredImageKeys, selectedImageKeys);
+           context.container().selectAll('.layer-mapillary .viewfield-group').classed('highlighted', function (d) {
+             return highlightedImageKeys.indexOf(d.key) !== -1;
+           }).classed('hovered', function (d) {
+             return d.key === hoveredImageKey;
+           });
+           context.container().selectAll('.layer-mapillary .sequence').classed('highlighted', function (d) {
+             return d.properties.key === hoveredSequenceKey;
+           }).classed('currentView', function (d) {
+             return d.properties.key === selectedSequenceKey;
+           }); // update viewfields if needed
 
-           mode.zoomToSelected = function() {
-               if (!services.osm) return;
-               var note = services.osm.getNote(selectedNoteID);
-               if (note) {
-                   context.map().centerZoomEase(note.loc, 20);
-               }
-           };
+           context.container().selectAll('.viewfield-group .viewfield').attr('d', viewfieldPath);
 
+           function viewfieldPath() {
+             var d = this.parentNode.__data__;
 
-           mode.newFeature = function(val) {
-               if (!arguments.length) return _newFeature;
-               _newFeature = val;
-               return mode;
-           };
+             if (d.pano && d.key !== selectedImageKey) {
+               return 'M 8,13 m -10,0 a 10,10 0 1,0 20,0 a 10,10 0 1,0 -20,0';
+             } else {
+               return 'M 6,9 C 8,8.4 8,8.4 10,9 L 16,-2 C 12,-5 4,-5 0,-2 z';
+             }
+           }
 
+           return this;
+         },
+         updateDetections: function updateDetections(imageKey, url) {
+           if (!_mlyViewer || _mlyFallback) return;
+           if (!imageKey) return;
 
-           mode.enter = function() {
-               var note = checkSelectedID();
-               if (!note) return;
+           if (!_mlyCache.image_detections.forImageKey[imageKey]) {
+             loadData('image_detections', url).then(function () {
+               showDetections(_mlyCache.image_detections.forImageKey[imageKey] || []);
+             });
+           } else {
+             showDetections(_mlyCache.image_detections.forImageKey[imageKey]);
+           }
 
-               _behaviors.forEach(context.install);
+           function showDetections(detections) {
+             detections.forEach(function (data) {
+               var tag = makeTag(data);
 
-               _keybinding
-                   .on(_t('inspector.zoom_to.key'), mode.zoomToSelected)
-                   .on('⎋', esc, true);
+               if (tag) {
+                 var tagComponent = _mlyViewer.getComponent('tag');
 
-               select(document)
-                   .call(_keybinding);
+                 tagComponent.add([tag]);
+               }
+             });
+           }
 
-               selectNote();
+           function makeTag(data) {
+             var valueParts = data.value.split('--');
+             if (!valueParts.length) return;
+             var tag;
+             var text;
+             var color = 0xffffff;
 
-               var sidebar = context.ui().sidebar;
-               sidebar.show(_noteEditor.note(note).newNote(_newFeature));
+             if (_mlyHighlightedDetection === data.key) {
+               color = 0xffff00;
+               text = valueParts[1];
 
-               // expand the sidebar, avoid obscuring the note if needed
-               sidebar.expand(sidebar.intersects(note.extent()));
+               if (text === 'flat' || text === 'discrete' || text === 'sign') {
+                 text = valueParts[2];
+               }
 
-               context.map()
-                   .on('drawn.select', selectNote);
-           };
+               text = text.replace(/-/g, ' ');
+               text = text.charAt(0).toUpperCase() + text.slice(1);
+               _mlyHighlightedDetection = null;
+             }
 
+             if (data.shape.type === 'Polygon') {
+               var polygonGeometry = new Mapillary.TagComponent.PolygonGeometry(data.shape.coordinates[0]);
+               tag = new Mapillary.TagComponent.OutlineTag(data.key, polygonGeometry, {
+                 text: text,
+                 textColor: color,
+                 lineColor: color,
+                 lineWidth: 2,
+                 fillColor: color,
+                 fillOpacity: 0.3
+               });
+             } else if (data.shape.type === 'Point') {
+               var pointGeometry = new Mapillary.TagComponent.PointGeometry(data.shape.coordinates[0]);
+               tag = new Mapillary.TagComponent.SpotTag(data.key, pointGeometry, {
+                 text: text,
+                 color: color,
+                 textColor: color
+               });
+             }
 
-           mode.exit = function() {
-               _behaviors.forEach(context.uninstall);
+             return tag;
+           }
+         },
+         cache: function cache() {
+           return _mlyCache;
+         }
+       };
 
-               select(document)
-                   .call(_keybinding.unbind);
+       function validationIssue(attrs) {
+         this.type = attrs.type; // required - name of rule that created the issue (e.g. 'missing_tag')
 
-               context.surface()
-                   .selectAll('.layer-notes .selected')
-                   .classed('selected hover', false);
+         this.subtype = attrs.subtype; // optional - category of the issue within the type (e.g. 'relation_type' under 'missing_tag')
 
-               context.map()
-                   .on('drawn.select', null);
+         this.severity = attrs.severity; // required - 'warning' or 'error'
 
-               context.ui().sidebar
-                   .hide();
+         this.message = attrs.message; // required - function returning localized string
 
-               context.selectedNoteID(null);
-           };
+         this.reference = attrs.reference; // optional - function(selection) to render reference information
 
+         this.entityIds = attrs.entityIds; // optional - array of IDs of entities involved in the issue
 
-           return mode;
-       }
+         this.loc = attrs.loc; // optional - [lon, lat] to zoom in on to see the issue
 
-       function modeDragNote(context) {
-           var mode = {
-               id: 'drag-note',
-               button: 'browse'
-           };
+         this.data = attrs.data; // optional - object containing extra data for the fixes
 
-           var edit = behaviorEdit(context);
+         this.dynamicFixes = attrs.dynamicFixes; // optional - function(context) returning fixes
 
-           var _nudgeInterval;
-           var _lastLoc;
-           var _note;    // most current note.. dragged note may have stale datum.
+         this.hash = attrs.hash; // optional - string to further differentiate the issue
 
+         this.id = generateID.apply(this); // generated - see below
 
-           function startNudge(nudge) {
-               if (_nudgeInterval) window.clearInterval(_nudgeInterval);
-               _nudgeInterval = window.setInterval(function() {
-                   context.map().pan(nudge);
-                   doMove(nudge);
-               }, 50);
-           }
+         this.autoFix = null; // generated - if autofix exists, will be set below
+         // A unique, deterministic string hash.
+         // Issues with identical id values are considered identical.
 
+         function generateID() {
+           var parts = [this.type];
 
-           function stopNudge() {
-               if (_nudgeInterval) {
-                   window.clearInterval(_nudgeInterval);
-                   _nudgeInterval = null;
-               }
+           if (this.hash) {
+             // subclasses can pass in their own differentiator
+             parts.push(this.hash);
            }
 
+           if (this.subtype) {
+             parts.push(this.subtype);
+           } // include the entities this issue is for
+           // (sort them so the id is deterministic)
 
-           function origin(note) {
-               return context.projection(note.loc);
-           }
 
+           if (this.entityIds) {
+             var entityKeys = this.entityIds.slice().sort();
+             parts.push.apply(parts, entityKeys);
+           }
 
-           function start(note) {
-               _note = note;
-               var osm = services.osm;
-               if (osm) {
-                   // Get latest note from cache.. The marker may have a stale datum bound to it
-                   // and dragging it around can sometimes delete the users note comment.
-                   _note = osm.getNote(_note.id);
-               }
+           return parts.join(':');
+         }
 
-               context.surface().selectAll('.note-' + _note.id)
-                   .classed('active', true);
+         this.extent = function (resolver) {
+           if (this.loc) {
+             return geoExtent(this.loc);
+           }
 
-               context.perform(actionNoop());
-               context.enter(mode);
-               context.selectedNoteID(_note.id);
+           if (this.entityIds && this.entityIds.length) {
+             return this.entityIds.reduce(function (extent, entityId) {
+               return extent.extend(resolver.entity(entityId).extent(resolver));
+             }, geoExtent());
            }
 
+           return null;
+         };
 
-           function move() {
-               event.sourceEvent.stopPropagation();
-               _lastLoc = context.projection.invert(event.point);
+         this.fixes = function (context) {
+           var fixes = this.dynamicFixes ? this.dynamicFixes(context) : [];
+           var issue = this;
 
-               doMove();
-               var nudge = geoViewportEdge(event.point, context.map().dimensions());
-               if (nudge) {
-                   startNudge(nudge);
-               } else {
-                   stopNudge();
+           if (issue.severity === 'warning') {
+             // allow ignoring any issue that's not an error
+             fixes.push(new validationIssueFix({
+               title: _t.html('issues.fix.ignore_issue.title'),
+               icon: 'iD-icon-close',
+               onClick: function onClick() {
+                 context.validator().ignoreIssue(this.issue.id);
                }
+             }));
            }
 
+           fixes.forEach(function (fix) {
+             // the id doesn't matter as long as it's unique to this issue/fix
+             fix.id = fix.title; // add a reference to the issue for use in actions
 
-           function doMove(nudge) {
-               nudge = nudge || [0, 0];
+             fix.issue = issue;
 
-               var currPoint = (event && event.point) || context.projection(_lastLoc);
-               var currMouse = geoVecSubtract(currPoint, nudge);
-               var loc = context.projection.invert(currMouse);
+             if (fix.autoArgs) {
+               issue.autoFix = fix;
+             }
+           });
+           return fixes;
+         };
+       }
+       function validationIssueFix(attrs) {
+         this.title = attrs.title; // Required
 
-               _note = _note.move(loc);
+         this.onClick = attrs.onClick; // Optional - the function to run to apply the fix
 
-               var osm = services.osm;
-               if (osm) {
-                   osm.replaceNote(_note);  // update note cache
-               }
+         this.disabledReason = attrs.disabledReason; // Optional - a string explaining why the fix is unavailable, if any
 
-               context.replace(actionNoop());   // trigger redraw
-           }
+         this.icon = attrs.icon; // Optional - shows 'iD-icon-wrench' if not set
 
+         this.entityIds = attrs.entityIds || []; // Optional - used for hover-higlighting.
 
-           function end() {
-               context.replace(actionNoop());   // trigger redraw
+         this.autoArgs = attrs.autoArgs; // Optional - pass [actions, annotation] arglist if this fix can automatically run
 
-               context
-                   .selectedNoteID(_note.id)
-                   .enter(modeSelectNote(context, _note.id));
-           }
+         this.issue = null; // Generated link - added by validationIssue
+       }
 
+       var buildRuleChecks = function buildRuleChecks() {
+         return {
+           equals: function equals(_equals) {
+             return function (tags) {
+               return Object.keys(_equals).every(function (k) {
+                 return _equals[k] === tags[k];
+               });
+             };
+           },
+           notEquals: function notEquals(_notEquals) {
+             return function (tags) {
+               return Object.keys(_notEquals).some(function (k) {
+                 return _notEquals[k] !== tags[k];
+               });
+             };
+           },
+           absence: function absence(_absence) {
+             return function (tags) {
+               return Object.keys(tags).indexOf(_absence) === -1;
+             };
+           },
+           presence: function presence(_presence) {
+             return function (tags) {
+               return Object.keys(tags).indexOf(_presence) > -1;
+             };
+           },
+           greaterThan: function greaterThan(_greaterThan) {
+             var key = Object.keys(_greaterThan)[0];
+             var value = _greaterThan[key];
+             return function (tags) {
+               return tags[key] > value;
+             };
+           },
+           greaterThanEqual: function greaterThanEqual(_greaterThanEqual) {
+             var key = Object.keys(_greaterThanEqual)[0];
+             var value = _greaterThanEqual[key];
+             return function (tags) {
+               return tags[key] >= value;
+             };
+           },
+           lessThan: function lessThan(_lessThan) {
+             var key = Object.keys(_lessThan)[0];
+             var value = _lessThan[key];
+             return function (tags) {
+               return tags[key] < value;
+             };
+           },
+           lessThanEqual: function lessThanEqual(_lessThanEqual) {
+             var key = Object.keys(_lessThanEqual)[0];
+             var value = _lessThanEqual[key];
+             return function (tags) {
+               return tags[key] <= value;
+             };
+           },
+           positiveRegex: function positiveRegex(_positiveRegex) {
+             var tagKey = Object.keys(_positiveRegex)[0];
 
-           var drag = behaviorDrag()
-               .selector('.layer-touch.markers .target.note.new')
-               .surface(context.container().select('.main-map').node())
-               .origin(origin)
-               .on('start', start)
-               .on('move', move)
-               .on('end', end);
+             var expression = _positiveRegex[tagKey].join('|');
 
+             var regex = new RegExp(expression);
+             return function (tags) {
+               return regex.test(tags[tagKey]);
+             };
+           },
+           negativeRegex: function negativeRegex(_negativeRegex) {
+             var tagKey = Object.keys(_negativeRegex)[0];
 
-           mode.enter = function() {
-               context.install(edit);
-           };
+             var expression = _negativeRegex[tagKey].join('|');
 
+             var regex = new RegExp(expression);
+             return function (tags) {
+               return !regex.test(tags[tagKey]);
+             };
+           }
+         };
+       };
 
-           mode.exit = function() {
-               context.ui().sidebar.hover.cancel();
-               context.uninstall(edit);
+       var buildLineKeys = function buildLineKeys() {
+         return {
+           highway: {
+             rest_area: true,
+             services: true
+           },
+           railway: {
+             roundhouse: true,
+             station: true,
+             traverser: true,
+             turntable: true,
+             wash: true
+           }
+         };
+       };
 
-               context.surface()
-                   .selectAll('.active')
-                   .classed('active', false);
+       var serviceMapRules = {
+         init: function init() {
+           this._ruleChecks = buildRuleChecks();
+           this._validationRules = [];
+           this._areaKeys = osmAreaKeys;
+           this._lineKeys = buildLineKeys();
+         },
+         // list of rules only relevant to tag checks...
+         filterRuleChecks: function filterRuleChecks(selector) {
+           var _ruleChecks = this._ruleChecks;
+           return Object.keys(selector).reduce(function (rules, key) {
+             if (['geometry', 'error', 'warning'].indexOf(key) === -1) {
+               rules.push(_ruleChecks[key](selector[key]));
+             }
 
-               stopNudge();
+             return rules;
+           }, []);
+         },
+         // builds tagMap from mapcss-parse selector object...
+         buildTagMap: function buildTagMap(selector) {
+           var getRegexValues = function getRegexValues(regexes) {
+             return regexes.map(function (regex) {
+               return regex.replace(/\$|\^/g, '');
+             });
            };
 
-           mode.behavior = drag;
+           var tagMap = Object.keys(selector).reduce(function (expectedTags, key) {
+             var values;
+             var isRegex = /regex/gi.test(key);
+             var isEqual = /equals/gi.test(key);
 
-           return mode;
-       }
+             if (isRegex || isEqual) {
+               Object.keys(selector[key]).forEach(function (selectorKey) {
+                 values = isEqual ? [selector[key][selectorKey]] : getRegexValues(selector[key][selectorKey]);
 
-       function uiDataHeader() {
-           var _datum;
+                 if (expectedTags.hasOwnProperty(selectorKey)) {
+                   values = values.concat(expectedTags[selectorKey]);
+                 }
 
+                 expectedTags[selectorKey] = values;
+               });
+             } else if (/(greater|less)Than(Equal)?|presence/g.test(key)) {
+               var tagKey = /presence/.test(key) ? selector[key] : Object.keys(selector[key])[0];
+               values = [selector[key][tagKey]];
 
-           function dataHeader(selection) {
-               var header = selection.selectAll('.data-header')
-                   .data(
-                       (_datum ? [_datum] : []),
-                       function(d) { return d.__featurehash__; }
-                   );
+               if (expectedTags.hasOwnProperty(tagKey)) {
+                 values = values.concat(expectedTags[tagKey]);
+               }
 
-               header.exit()
-                   .remove();
+               expectedTags[tagKey] = values;
+             }
 
-               var headerEnter = header.enter()
-                   .append('div')
-                   .attr('class', 'data-header');
+             return expectedTags;
+           }, {});
+           return tagMap;
+         },
+         // inspired by osmWay#isArea()
+         inferGeometry: function inferGeometry(tagMap) {
+           var _lineKeys = this._lineKeys;
+           var _areaKeys = this._areaKeys;
 
-               var iconEnter = headerEnter
-                   .append('div')
-                   .attr('class', 'data-header-icon');
+           var keyValueDoesNotImplyArea = function keyValueDoesNotImplyArea(key) {
+             return utilArrayIntersection(tagMap[key], Object.keys(_areaKeys[key])).length > 0;
+           };
 
-               iconEnter
-                   .append('div')
-                   .attr('class', 'preset-icon-28')
-                   .call(svgIcon('#iD-icon-data', 'note-fill'));
+           var keyValueImpliesLine = function keyValueImpliesLine(key) {
+             return utilArrayIntersection(tagMap[key], Object.keys(_lineKeys[key])).length > 0;
+           };
 
-               headerEnter
-                   .append('div')
-                   .attr('class', 'data-header-label')
-                   .text(_t('map_data.layers.custom.title'));
+           if (tagMap.hasOwnProperty('area')) {
+             if (tagMap.area.indexOf('yes') > -1) {
+               return 'area';
+             }
+
+             if (tagMap.area.indexOf('no') > -1) {
+               return 'line';
+             }
            }
 
+           for (var key in tagMap) {
+             if (key in _areaKeys && !keyValueDoesNotImplyArea(key)) {
+               return 'area';
+             }
+
+             if (key in _lineKeys && keyValueImpliesLine(key)) {
+               return 'area';
+             }
+           }
 
-           dataHeader.datum = function(val) {
-               if (!arguments.length) return _datum;
-               _datum = val;
-               return this;
+           return 'line';
+         },
+         // adds from mapcss-parse selector check...
+         addRule: function addRule(selector) {
+           var rule = {
+             // checks relevant to mapcss-selector
+             checks: this.filterRuleChecks(selector),
+             // true if all conditions for a tag error are true..
+             matches: function matches(entity) {
+               return this.checks.every(function (check) {
+                 return check(entity.tags);
+               });
+             },
+             // borrowed from Way#isArea()
+             inferredGeometry: this.inferGeometry(this.buildTagMap(selector), this._areaKeys),
+             geometryMatches: function geometryMatches(entity, graph) {
+               if (entity.type === 'node' || entity.type === 'relation') {
+                 return selector.geometry === entity.type;
+               } else if (entity.type === 'way') {
+                 return this.inferredGeometry === entity.geometry(graph);
+               }
+             },
+             // when geometries match and tag matches are present, return a warning...
+             findIssues: function findIssues(entity, graph, issues) {
+               if (this.geometryMatches(entity, graph) && this.matches(entity)) {
+                 var severity = Object.keys(selector).indexOf('error') > -1 ? 'error' : 'warning';
+                 var _message = selector[severity];
+                 issues.push(new validationIssue({
+                   type: 'maprules',
+                   severity: severity,
+                   message: function message() {
+                     return _message;
+                   },
+                   entityIds: [entity.id]
+                 }));
+               }
+             }
            };
 
+           this._validationRules.push(rule);
+         },
+         clearRules: function clearRules() {
+           this._validationRules = [];
+         },
+         // returns validationRules...
+         validationRules: function validationRules() {
+           return this._validationRules;
+         },
+         // returns ruleChecks
+         ruleChecks: function ruleChecks() {
+           return this._ruleChecks;
+         }
+       };
 
-           return dataHeader;
-       }
+       var apibase$1 = 'https://nominatim.openstreetmap.org/';
+       var _inflight = {};
 
-       // This code assumes that the combobox values will not have duplicate entries.
-       // It is keyed on the `value` of the entry. Data should be an array of objects like:
-       //   [{
-       //       value:  'display text',  // required
-       //       title:  'hover text'     // optional
-       //   }, ...]
+       var _nominatimCache;
 
-       var _comboHideTimerID;
+       var serviceNominatim = {
+         init: function init() {
+           _inflight = {};
+           _nominatimCache = new RBush();
+         },
+         reset: function reset() {
+           Object.values(_inflight).forEach(function (controller) {
+             controller.abort();
+           });
+           _inflight = {};
+           _nominatimCache = new RBush();
+         },
+         countryCode: function countryCode(location, callback) {
+           this.reverse(location, function (err, result) {
+             if (err) {
+               return callback(err);
+             } else if (result.address) {
+               return callback(null, result.address.country_code);
+             } else {
+               return callback('Unable to geocode', null);
+             }
+           });
+         },
+         reverse: function reverse(loc, callback) {
+           var cached = _nominatimCache.search({
+             minX: loc[0],
+             minY: loc[1],
+             maxX: loc[0],
+             maxY: loc[1]
+           });
 
-       function uiCombobox(context, klass) {
-           var dispatch$1 = dispatch('accept', 'cancel');
-           var container = context.container();
+           if (cached.length > 0) {
+             if (callback) callback(null, cached[0].data);
+             return;
+           }
 
-           var _suggestions = [];
-           var _data = [];
-           var _fetched = {};
-           var _selected = null;
-           var _canAutocomplete = true;
-           var _caseSensitive = false;
-           var _cancelFetch = false;
-           var _minItems = 2;
-           var _tDown = 0;
-           var _mouseEnterHandler, _mouseLeaveHandler;
-
-           var _fetcher = function(val, cb) {
-               cb(_data.filter(function(d) {
-                   var terms = d.terms || [];
-                   terms.push(d.value);
-                   return terms.some(function(term) {
-                       return term
-                           .toString()
-                           .toLowerCase()
-                           .indexOf(val.toLowerCase()) !== -1;
-                   });
-               }));
+           var params = {
+             zoom: 13,
+             format: 'json',
+             addressdetails: 1,
+             lat: loc[1],
+             lon: loc[0]
            };
+           var url = apibase$1 + 'reverse?' + utilQsString(params);
+           if (_inflight[url]) return;
+           var controller = new AbortController();
+           _inflight[url] = controller;
+           d3_json(url, {
+             signal: controller.signal
+           }).then(function (result) {
+             delete _inflight[url];
 
-           var combobox = function(input, attachTo) {
-               if (!input || input.empty()) return;
-
-               input
-                   .classed('combobox-input', true)
-                   .on('focus.combo-input', focus)
-                   .on('blur.combo-input', blur)
-                   .on('keydown.combo-input', keydown)
-                   .on('keyup.combo-input', keyup)
-                   .on('input.combo-input', change)
-                   .on('mousedown.combo-input', mousedown)
-                   .each(function() {
-                       var parent = this.parentNode;
-                       var sibling = this.nextSibling;
-
-                       select(parent).selectAll('.combobox-caret')
-                           .filter(function(d) { return d === input.node(); })
-                           .data([input.node()])
-                           .enter()
-                           .insert('div', function() { return sibling; })
-                           .attr('class', 'combobox-caret')
-                           .on('mousedown.combo-caret', function() {
-                               event.preventDefault(); // don't steal focus from input
-                               input.node().focus(); // focus the input as if it was clicked
-                               mousedown();
-                           })
-                           .on('mouseup.combo-caret', function() {
-                               event.preventDefault(); // don't steal focus from input
-                               mouseup();
-                           });
-                   });
+             if (result && result.error) {
+               throw new Error(result.error);
+             }
 
+             var extent = geoExtent(loc).padByMeters(200);
 
-               function mousedown() {
-                   if (event.button !== 0) return;    // left click only
-                   _tDown = +new Date();
+             _nominatimCache.insert(Object.assign(extent.bbox(), {
+               data: result
+             }));
 
-                   // clear selection
-                   var start = input.property('selectionStart');
-                   var end = input.property('selectionEnd');
-                   if (start !== end) {
-                       var val = utilGetSetValue(input);
-                       input.node().setSelectionRange(val.length, val.length);
-                       return;
-                   }
+             if (callback) callback(null, result);
+           })["catch"](function (err) {
+             delete _inflight[url];
+             if (err.name === 'AbortError') return;
+             if (callback) callback(err.message);
+           });
+         },
+         search: function search(val, callback) {
+           var searchVal = encodeURIComponent(val);
+           var url = apibase$1 + 'search/' + searchVal + '?limit=10&format=json';
+           if (_inflight[url]) return;
+           var controller = new AbortController();
+           _inflight[url] = controller;
+           d3_json(url, {
+             signal: controller.signal
+           }).then(function (result) {
+             delete _inflight[url];
 
-                   input.on('mouseup.combo-input', mouseup);
-               }
+             if (result && result.error) {
+               throw new Error(result.error);
+             }
 
+             if (callback) callback(null, result);
+           })["catch"](function (err) {
+             delete _inflight[url];
+             if (err.name === 'AbortError') return;
+             if (callback) callback(err.message);
+           });
+         }
+       };
 
-               function mouseup() {
-                   input.on('mouseup.combo-input', null);
-                   if (event.button !== 0) return;    // left click only
-                   if (input.node() !== document.activeElement) return;   // exit if this input is not focused
+       var apibase$2 = 'https://openstreetcam.org';
+       var maxResults$1 = 1000;
+       var tileZoom$1 = 14;
+       var tiler$4 = utilTiler().zoomExtent([tileZoom$1, tileZoom$1]).skipNullIsland(true);
+       var dispatch$5 = dispatch('loadedImages');
+       var imgZoom = d3_zoom().extent([[0, 0], [320, 240]]).translateExtent([[0, 0], [320, 240]]).scaleExtent([1, 15]);
 
-                   var start = input.property('selectionStart');
-                   var end = input.property('selectionEnd');
-                   if (start !== end) return;  // exit if user is selecting
-
-                   // not showing or showing for a different field - try to show it.
-                   var combo = container.selectAll('.combobox');
-                   if (combo.empty() || combo.datum() !== input.node()) {
-                       var tOrig = _tDown;
-                       window.setTimeout(function() {
-                           if (tOrig !== _tDown) return;   // exit if user double clicked
-                           fetchComboData('', function() {
-                               show();
-                               render();
-                           });
-                       }, 250);
+       var _oscCache;
 
-                   } else {
-                       hide();
-                   }
-               }
+       var _oscSelectedImage;
 
+       var _loadViewerPromise$1;
 
-               function focus() {
-                   fetchComboData('');   // prefetch values (may warm taginfo cache)
-               }
+       function abortRequest$4(controller) {
+         controller.abort();
+       }
 
+       function maxPageAtZoom$1(z) {
+         if (z < 15) return 2;
+         if (z === 15) return 5;
+         if (z === 16) return 10;
+         if (z === 17) return 20;
+         if (z === 18) return 40;
+         if (z > 18) return 80;
+       }
 
-               function blur() {
-                   _comboHideTimerID = window.setTimeout(hide, 75);
-               }
+       function loadTiles$1(which, url, projection) {
+         var currZoom = Math.floor(geoScaleToZoom(projection.scale()));
+         var tiles = tiler$4.getTiles(projection); // abort inflight requests that are no longer needed
 
+         var cache = _oscCache[which];
+         Object.keys(cache.inflight).forEach(function (k) {
+           var wanted = tiles.find(function (tile) {
+             return k.indexOf(tile.id + ',') === 0;
+           });
 
-               function show() {
-                   hide();   // remove any existing
+           if (!wanted) {
+             abortRequest$4(cache.inflight[k]);
+             delete cache.inflight[k];
+           }
+         });
+         tiles.forEach(function (tile) {
+           loadNextTilePage$1(which, currZoom, url, tile);
+         });
+       }
 
-                   container
-                       .insert('div', ':first-child')
-                       .datum(input.node())
-                       .attr('class', 'combobox' + (klass ? ' combobox-' + klass : ''))
-                       .style('position', 'absolute')
-                       .style('display', 'block')
-                       .style('left', '0px')
-                       .on('mousedown.combo-container', function () {
-                           // prevent moving focus out of the input field
-                           event.preventDefault();
-                       });
+       function loadNextTilePage$1(which, currZoom, url, tile) {
+         var cache = _oscCache[which];
+         var bbox = tile.extent.bbox();
+         var maxPages = maxPageAtZoom$1(currZoom);
+         var nextPage = cache.nextPage[tile.id] || 1;
+         var params = utilQsString({
+           ipp: maxResults$1,
+           page: nextPage,
+           // client_id: clientId,
+           bbTopLeft: [bbox.maxY, bbox.minX].join(','),
+           bbBottomRight: [bbox.minY, bbox.maxX].join(',')
+         }, true);
+         if (nextPage > maxPages) return;
+         var id = tile.id + ',' + String(nextPage);
+         if (cache.loaded[id] || cache.inflight[id]) return;
+         var controller = new AbortController();
+         cache.inflight[id] = controller;
+         var options = {
+           method: 'POST',
+           signal: controller.signal,
+           body: params,
+           headers: {
+             'Content-Type': 'application/x-www-form-urlencoded'
+           }
+         };
+         d3_json(url, options).then(function (data) {
+           cache.loaded[id] = true;
+           delete cache.inflight[id];
 
-                   container
-                       .on('scroll.combo-scroll', render, true);
-               }
+           if (!data || !data.currentPageItems || !data.currentPageItems.length) {
+             throw new Error('No Data');
+           }
 
+           var features = data.currentPageItems.map(function (item) {
+             var loc = [+item.lng, +item.lat];
+             var d;
 
-               function hide() {
-                   if (_comboHideTimerID) {
-                       window.clearTimeout(_comboHideTimerID);
-                       _comboHideTimerID = undefined;
-                   }
+             if (which === 'images') {
+               d = {
+                 loc: loc,
+                 key: item.id,
+                 ca: +item.heading,
+                 captured_at: item.shot_date || item.date_added,
+                 captured_by: item.username,
+                 imagePath: item.lth_name,
+                 sequence_id: item.sequence_id,
+                 sequence_index: +item.sequence_index
+               }; // cache sequence info
 
-                   container.selectAll('.combobox')
-                       .remove();
+               var seq = _oscCache.sequences[d.sequence_id];
 
-                   container
-                       .on('scroll.combo-scroll', null);
+               if (!seq) {
+                 seq = {
+                   rotation: 0,
+                   images: []
+                 };
+                 _oscCache.sequences[d.sequence_id] = seq;
                }
 
+               seq.images[d.sequence_index] = d;
+               _oscCache.images.forImageKey[d.key] = d; // cache imageKey -> image
+             }
 
-               function keydown() {
-                   var shown = !container.selectAll('.combobox').empty();
-                   var tagName = input.node() ? input.node().tagName.toLowerCase() : '';
+             return {
+               minX: loc[0],
+               minY: loc[1],
+               maxX: loc[0],
+               maxY: loc[1],
+               data: d
+             };
+           });
+           cache.rtree.load(features);
 
-                   switch (event.keyCode) {
-                       case 8:   // ⌫ Backspace
-                       case 46:  // ⌦ Delete
-                           event.stopPropagation();
-                           _selected = null;
-                           render();
-                           input.on('input.combo-input', function() {
-                               var start = input.property('selectionStart');
-                               input.node().setSelectionRange(start, start);
-                               input.on('input.combo-input', change);
-                           });
-                           break;
-
-                       case 9:   // ⇥ Tab
-                           accept();
-                           break;
-
-                       case 13:  // ↩ Return
-                           event.preventDefault();
-                           event.stopPropagation();
-                           break;
-
-                       case 38:  // ↑ Up arrow
-                           if (tagName === 'textarea' && !shown) return;
-                           event.preventDefault();
-                           if (tagName === 'input' && !shown) {
-                               show();
-                           }
-                           nav(-1);
-                           break;
-
-                       case 40:  // ↓ Down arrow
-                           if (tagName === 'textarea' && !shown) return;
-                           event.preventDefault();
-                           if (tagName === 'input' && !shown) {
-                               show();
-                           }
-                           nav(+1);
-                           break;
-                   }
-               }
+           if (data.currentPageItems.length === maxResults$1) {
+             // more pages to load
+             cache.nextPage[tile.id] = nextPage + 1;
+             loadNextTilePage$1(which, currZoom, url, tile);
+           } else {
+             cache.nextPage[tile.id] = Infinity; // no more pages to load
+           }
 
+           if (which === 'images') {
+             dispatch$5.call('loadedImages');
+           }
+         })["catch"](function () {
+           cache.loaded[id] = true;
+           delete cache.inflight[id];
+         });
+       } // partition viewport into higher zoom tiles
 
-               function keyup() {
-                   switch (event.keyCode) {
-                       case 27:  // ⎋ Escape
-                           cancel();
-                           break;
 
-                       case 13:  // ↩ Return
-                           accept();
-                           break;
-                   }
-               }
+       function partitionViewport$1(projection) {
+         var z = geoScaleToZoom(projection.scale());
+         var z2 = Math.ceil(z * 2) / 2 + 2.5; // round to next 0.5 and add 2.5
 
+         var tiler = utilTiler().zoomExtent([z2, z2]);
+         return tiler.getTiles(projection).map(function (tile) {
+           return tile.extent;
+         });
+       } // no more than `limit` results per partition.
 
-               // Called whenever the input value is changed (e.g. on typing)
-               function change() {
-                   fetchComboData(value(), function() {
-                       _selected = null;
-                       var val = input.property('value');
 
-                       if (_suggestions.length) {
-                           if (input.property('selectionEnd') === val.length) {
-                               _selected = tryAutocomplete();
-                           }
+       function searchLimited$1(limit, projection, rtree) {
+         limit = limit || 5;
+         return partitionViewport$1(projection).reduce(function (result, extent) {
+           var found = rtree.search(extent.bbox()).slice(0, limit).map(function (d) {
+             return d.data;
+           });
+           return found.length ? result.concat(found) : result;
+         }, []);
+       }
 
-                           if (!_selected) {
-                               _selected = val;
-                           }
-                       }
+       var serviceOpenstreetcam = {
+         init: function init() {
+           if (!_oscCache) {
+             this.reset();
+           }
 
-                       if (val.length) {
-                           var combo = container.selectAll('.combobox');
-                           if (combo.empty()) {
-                               show();
-                           }
-                       } else {
-                           hide();
-                       }
+           this.event = utilRebind(this, dispatch$5, 'on');
+         },
+         reset: function reset() {
+           if (_oscCache) {
+             Object.values(_oscCache.images.inflight).forEach(abortRequest$4);
+           }
+
+           _oscCache = {
+             images: {
+               inflight: {},
+               loaded: {},
+               nextPage: {},
+               rtree: new RBush(),
+               forImageKey: {}
+             },
+             sequences: {}
+           };
+           _oscSelectedImage = null;
+         },
+         images: function images(projection) {
+           var limit = 5;
+           return searchLimited$1(limit, projection, _oscCache.images.rtree);
+         },
+         sequences: function sequences(projection) {
+           var viewport = projection.clipExtent();
+           var min = [viewport[0][0], viewport[1][1]];
+           var max = [viewport[1][0], viewport[0][1]];
+           var bbox = geoExtent(projection.invert(min), projection.invert(max)).bbox();
+           var sequenceKeys = {}; // all sequences for images in viewport
 
-                       render();
-                   });
-               }
+           _oscCache.images.rtree.search(bbox).forEach(function (d) {
+             sequenceKeys[d.data.sequence_id] = true;
+           }); // make linestrings from those sequences
 
 
-               // Called when the user presses up/down arrows to navigate the list
-               function nav(dir) {
-                   if (_suggestions.length) {
-                       // try to determine previously selected index..
-                       var index = -1;
-                       for (var i = 0; i < _suggestions.length; i++) {
-                           if (_selected && _suggestions[i].value === _selected) {
-                               index = i;
-                               break;
-                           }
-                       }
+           var lineStrings = [];
+           Object.keys(sequenceKeys).forEach(function (sequenceKey) {
+             var seq = _oscCache.sequences[sequenceKey];
+             var images = seq && seq.images;
+
+             if (images) {
+               lineStrings.push({
+                 type: 'LineString',
+                 coordinates: images.map(function (d) {
+                   return d.loc;
+                 }).filter(Boolean),
+                 properties: {
+                   captured_at: images[0] ? images[0].captured_at : null,
+                   captured_by: images[0] ? images[0].captured_by : null,
+                   key: sequenceKey
+                 }
+               });
+             }
+           });
+           return lineStrings;
+         },
+         cachedImage: function cachedImage(imageKey) {
+           return _oscCache.images.forImageKey[imageKey];
+         },
+         loadImages: function loadImages(projection) {
+           var url = apibase$2 + '/1.0/list/nearby-photos/';
+           loadTiles$1('images', url, projection);
+         },
+         ensureViewerLoaded: function ensureViewerLoaded(context) {
+           if (_loadViewerPromise$1) return _loadViewerPromise$1; // add osc-wrapper
+
+           var wrap = context.container().select('.photoviewer').selectAll('.osc-wrapper').data([0]);
+           var that = this;
+           var wrapEnter = wrap.enter().append('div').attr('class', 'photo-wrapper osc-wrapper').classed('hide', true).call(imgZoom.on('zoom', zoomPan)).on('dblclick.zoom', null);
+           wrapEnter.append('div').attr('class', 'photo-attribution fillD');
+           var controlsEnter = wrapEnter.append('div').attr('class', 'photo-controls-wrap').append('div').attr('class', 'photo-controls');
+           controlsEnter.append('button').on('click.back', step(-1)).html('◄');
+           controlsEnter.append('button').on('click.rotate-ccw', rotate(-90)).html('⤿');
+           controlsEnter.append('button').on('click.rotate-cw', rotate(90)).html('⤾');
+           controlsEnter.append('button').on('click.forward', step(1)).html('►');
+           wrapEnter.append('div').attr('class', 'osc-image-wrap'); // Register viewer resize handler
+
+           context.ui().photoviewer.on('resize.openstreetcam', function (dimensions) {
+             imgZoom = d3_zoom().extent([[0, 0], dimensions]).translateExtent([[0, 0], dimensions]).scaleExtent([1, 15]).on('zoom', zoomPan);
+           });
 
-                       // pick new _selected
-                       index = Math.max(Math.min(index + dir, _suggestions.length - 1), 0);
-                       _selected = _suggestions[index].value;
-                       input.property('value', _selected);
-                   }
+           function zoomPan(d3_event) {
+             var t = d3_event.transform;
+             context.container().select('.photoviewer .osc-image-wrap').call(utilSetTransform, t.x, t.y, t.k);
+           }
+
+           function rotate(deg) {
+             return function () {
+               if (!_oscSelectedImage) return;
+               var sequenceKey = _oscSelectedImage.sequence_id;
+               var sequence = _oscCache.sequences[sequenceKey];
+               if (!sequence) return;
+               var r = sequence.rotation || 0;
+               r += deg;
+               if (r > 180) r -= 360;
+               if (r < -180) r += 360;
+               sequence.rotation = r;
+               var wrap = context.container().select('.photoviewer .osc-wrapper');
+               wrap.transition().duration(100).call(imgZoom.transform, identity$2);
+               wrap.selectAll('.osc-image').transition().duration(100).style('transform', 'rotate(' + r + 'deg)');
+             };
+           }
 
-                   render();
-                   ensureVisible();
-               }
+           function step(stepBy) {
+             return function () {
+               if (!_oscSelectedImage) return;
+               var sequenceKey = _oscSelectedImage.sequence_id;
+               var sequence = _oscCache.sequences[sequenceKey];
+               if (!sequence) return;
+               var nextIndex = _oscSelectedImage.sequence_index + stepBy;
+               var nextImage = sequence.images[nextIndex];
+               if (!nextImage) return;
+               context.map().centerEase(nextImage.loc);
+               that.selectImage(context, nextImage.key);
+             };
+           } // don't need any async loading so resolve immediately
 
 
-               function ensureVisible() {
-                   var combo = container.selectAll('.combobox');
-                   if (combo.empty()) return;
+           _loadViewerPromise$1 = Promise.resolve();
+           return _loadViewerPromise$1;
+         },
+         showViewer: function showViewer(context) {
+           var viewer = context.container().select('.photoviewer').classed('hide', false);
+           var isHidden = viewer.selectAll('.photo-wrapper.osc-wrapper.hide').size();
 
-                   var containerRect = container.node().getBoundingClientRect();
-                   var comboRect = combo.node().getBoundingClientRect();
+           if (isHidden) {
+             viewer.selectAll('.photo-wrapper:not(.osc-wrapper)').classed('hide', true);
+             viewer.selectAll('.photo-wrapper.osc-wrapper').classed('hide', false);
+           }
 
-                   if (comboRect.bottom > containerRect.bottom) {
-                       var node = attachTo ? attachTo.node() : input.node();
-                       node.scrollIntoView({ behavior: 'instant', block: 'center' });
-                       render();
-                   }
+           return this;
+         },
+         hideViewer: function hideViewer(context) {
+           _oscSelectedImage = null;
+           this.updateUrlImage(null);
+           var viewer = context.container().select('.photoviewer');
+           if (!viewer.empty()) viewer.datum(null);
+           viewer.classed('hide', true).selectAll('.photo-wrapper').classed('hide', true);
+           context.container().selectAll('.viewfield-group, .sequence, .icon-sign').classed('currentView', false);
+           return this.setStyles(context, null, true);
+         },
+         selectImage: function selectImage(context, imageKey) {
+           var d = this.cachedImage(imageKey);
+           _oscSelectedImage = d;
+           this.updateUrlImage(imageKey);
+           var viewer = context.container().select('.photoviewer');
+           if (!viewer.empty()) viewer.datum(d);
+           this.setStyles(context, null, true);
+           context.container().selectAll('.icon-sign').classed('currentView', false);
+           if (!d) return this;
+           var wrap = context.container().select('.photoviewer .osc-wrapper');
+           var imageWrap = wrap.selectAll('.osc-image-wrap');
+           var attribution = wrap.selectAll('.photo-attribution').html('');
+           wrap.transition().duration(100).call(imgZoom.transform, identity$2);
+           imageWrap.selectAll('.osc-image').remove();
 
-                   // https://stackoverflow.com/questions/11039885/scrollintoview-causing-the-whole-page-to-move
-                   var selected = combo.selectAll('.combobox-option.selected').node();
-                   if (selected) {
-                       selected.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
-                   }
-               }
+           if (d) {
+             var sequence = _oscCache.sequences[d.sequence_id];
+             var r = sequence && sequence.rotation || 0;
+             imageWrap.append('img').attr('class', 'osc-image').attr('src', apibase$2 + '/' + d.imagePath).style('transform', 'rotate(' + r + 'deg)');
 
+             if (d.captured_by) {
+               attribution.append('a').attr('class', 'captured_by').attr('target', '_blank').attr('href', 'https://openstreetcam.org/user/' + encodeURIComponent(d.captured_by)).html('@' + d.captured_by);
+               attribution.append('span').html('|');
+             }
 
-               function value() {
-                   var value = input.property('value');
-                   var start = input.property('selectionStart');
-                   var end = input.property('selectionEnd');
+             if (d.captured_at) {
+               attribution.append('span').attr('class', 'captured_at').html(localeDateString(d.captured_at));
+               attribution.append('span').html('|');
+             }
 
-                   if (start && end) {
-                       value = value.substring(0, start);
-                   }
+             attribution.append('a').attr('class', 'image-link').attr('target', '_blank').attr('href', 'https://openstreetcam.org/details/' + d.sequence_id + '/' + d.sequence_index).html('openstreetcam.org');
+           }
 
-                   return value;
-               }
+           return this;
+
+           function localeDateString(s) {
+             if (!s) return null;
+             var options = {
+               day: 'numeric',
+               month: 'short',
+               year: 'numeric'
+             };
+             var d = new Date(s);
+             if (isNaN(d.getTime())) return null;
+             return d.toLocaleDateString(_mainLocalizer.localeCode(), options);
+           }
+         },
+         getSelectedImage: function getSelectedImage() {
+           return _oscSelectedImage;
+         },
+         getSequenceKeyForImage: function getSequenceKeyForImage(d) {
+           return d && d.sequence_id;
+         },
+         // Updates the currently highlighted sequence and selected bubble.
+         // Reset is only necessary when interacting with the viewport because
+         // this implicitly changes the currently selected bubble/sequence
+         setStyles: function setStyles(context, hovered, reset) {
+           if (reset) {
+             // reset all layers
+             context.container().selectAll('.viewfield-group').classed('highlighted', false).classed('hovered', false).classed('currentView', false);
+             context.container().selectAll('.sequence').classed('highlighted', false).classed('currentView', false);
+           }
+
+           var hoveredImageKey = hovered && hovered.key;
+           var hoveredSequenceKey = this.getSequenceKeyForImage(hovered);
+           var hoveredSequence = hoveredSequenceKey && _oscCache.sequences[hoveredSequenceKey];
+           var hoveredImageKeys = hoveredSequence && hoveredSequence.images.map(function (d) {
+             return d.key;
+           }) || [];
+           var viewer = context.container().select('.photoviewer');
+           var selected = viewer.empty() ? undefined : viewer.datum();
+           var selectedImageKey = selected && selected.key;
+           var selectedSequenceKey = this.getSequenceKeyForImage(selected);
+           var selectedSequence = selectedSequenceKey && _oscCache.sequences[selectedSequenceKey];
+           var selectedImageKeys = selectedSequence && selectedSequence.images.map(function (d) {
+             return d.key;
+           }) || []; // highlight sibling viewfields on either the selected or the hovered sequences
+
+           var highlightedImageKeys = utilArrayUnion(hoveredImageKeys, selectedImageKeys);
+           context.container().selectAll('.layer-openstreetcam .viewfield-group').classed('highlighted', function (d) {
+             return highlightedImageKeys.indexOf(d.key) !== -1;
+           }).classed('hovered', function (d) {
+             return d.key === hoveredImageKey;
+           }).classed('currentView', function (d) {
+             return d.key === selectedImageKey;
+           });
+           context.container().selectAll('.layer-openstreetcam .sequence').classed('highlighted', function (d) {
+             return d.properties.key === hoveredSequenceKey;
+           }).classed('currentView', function (d) {
+             return d.properties.key === selectedSequenceKey;
+           }); // update viewfields if needed
 
+           context.container().selectAll('.viewfield-group .viewfield').attr('d', viewfieldPath);
 
-               function fetchComboData(v, cb) {
-                   _cancelFetch = false;
+           function viewfieldPath() {
+             var d = this.parentNode.__data__;
 
-                   _fetcher.call(input, v, function(results) {
-                       // already chose a value, don't overwrite or autocomplete it
-                       if (_cancelFetch) return;
+             if (d.pano && d.key !== selectedImageKey) {
+               return 'M 8,13 m -10,0 a 10,10 0 1,0 20,0 a 10,10 0 1,0 -20,0';
+             } else {
+               return 'M 6,9 C 8,8.4 8,8.4 10,9 L 16,-2 C 12,-5 4,-5 0,-2 z';
+             }
+           }
 
-                       _suggestions = results;
-                       results.forEach(function(d) { _fetched[d.value] = d; });
+           return this;
+         },
+         updateUrlImage: function updateUrlImage(imageKey) {
+           if (!window.mocha) {
+             var hash = utilStringQs(window.location.hash);
 
-                       if (cb) {
-                           cb();
-                       }
-                   });
-               }
+             if (imageKey) {
+               hash.photo = 'openstreetcam/' + imageKey;
+             } else {
+               delete hash.photo;
+             }
 
+             window.location.replace('#' + utilQsString(hash, true));
+           }
+         },
+         cache: function cache() {
+           return _oscCache;
+         }
+       };
 
-               function tryAutocomplete() {
-                   if (!_canAutocomplete) return;
+       var FORCED$f = fails(function () {
+         return new Date(NaN).toJSON() !== null
+           || Date.prototype.toJSON.call({ toISOString: function () { return 1; } }) !== 1;
+       });
 
-                   var val = _caseSensitive ? value() : value().toLowerCase();
-                   if (!val) return;
+       // `Date.prototype.toJSON` method
+       // https://tc39.github.io/ecma262/#sec-date.prototype.tojson
+       _export({ target: 'Date', proto: true, forced: FORCED$f }, {
+         // eslint-disable-next-line no-unused-vars
+         toJSON: function toJSON(key) {
+           var O = toObject(this);
+           var pv = toPrimitive(O);
+           return typeof pv == 'number' && !isFinite(pv) ? null : O.toISOString();
+         }
+       });
 
-                   // Don't autocomplete if user is typing a number - #4935
-                   if (!isNaN(parseFloat(val)) && isFinite(val)) return;
+       // `URL.prototype.toJSON` method
+       // https://url.spec.whatwg.org/#dom-url-tojson
+       _export({ target: 'URL', proto: true, enumerable: true }, {
+         toJSON: function toJSON() {
+           return URL.prototype.toString.call(this);
+         }
+       });
 
-                   var bestIndex = -1;
-                   for (var i = 0; i < _suggestions.length; i++) {
-                       var suggestion = _suggestions[i].value;
-                       var compare = _caseSensitive ? suggestion : suggestion.toLowerCase();
+       /**
+        * Checks if `value` is the
+        * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)
+        * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
+        *
+        * @static
+        * @memberOf _
+        * @since 0.1.0
+        * @category Lang
+        * @param {*} value The value to check.
+        * @returns {boolean} Returns `true` if `value` is an object, else `false`.
+        * @example
+        *
+        * _.isObject({});
+        * // => true
+        *
+        * _.isObject([1, 2, 3]);
+        * // => true
+        *
+        * _.isObject(_.noop);
+        * // => true
+        *
+        * _.isObject(null);
+        * // => false
+        */
+       function isObject$1(value) {
+         var type = _typeof(value);
 
-                       // if search string matches suggestion exactly, pick it..
-                       if (compare === val) {
-                           bestIndex = i;
-                           break;
+         return value != null && (type == 'object' || type == 'function');
+       }
 
-                       // otherwise lock in the first result that starts with the search string..
-                       } else if (bestIndex === -1 && compare.indexOf(val) === 0) {
-                           bestIndex = i;
-                       }
-                   }
+       /** Detect free variable `global` from Node.js. */
+       var freeGlobal = (typeof global === "undefined" ? "undefined" : _typeof(global)) == 'object' && global && global.Object === Object && global;
 
-                   if (bestIndex !== -1) {
-                       var bestVal = _suggestions[bestIndex].value;
-                       input.property('value', bestVal);
-                       input.node().setSelectionRange(val.length, bestVal.length);
-                       return bestVal;
-                   }
-               }
+       /** Detect free variable `self`. */
 
+       var freeSelf = (typeof self === "undefined" ? "undefined" : _typeof(self)) == 'object' && self && self.Object === Object && self;
+       /** Used as a reference to the global object. */
 
-               function render() {
-                   if (_suggestions.length < _minItems || document.activeElement !== input.node()) {
-                       hide();
-                       return;
-                   }
+       var root$1 = freeGlobal || freeSelf || Function('return this')();
 
-                   var shown = !container.selectAll('.combobox').empty();
-                   if (!shown) return;
-
-                   var combo = container.selectAll('.combobox');
-                   var options = combo.selectAll('.combobox-option')
-                       .data(_suggestions, function(d) { return d.value; });
-
-                   options.exit()
-                       .remove();
-
-                   // enter/update
-                   options.enter()
-                       .append('a')
-                       .attr('class', 'combobox-option')
-                       .attr('title', function(d) { return d.title; })
-                       .text(function(d) { return d.display || d.value; })
-                       .on('mouseenter', _mouseEnterHandler)
-                       .on('mouseleave', _mouseLeaveHandler)
-                       .merge(options)
-                       .classed('selected', function(d) { return d.value === _selected; })
-                       .on('click.combo-option', accept)
-                       .order();
-
-                   var node = attachTo ? attachTo.node() : input.node();
-                   var containerRect = container.node().getBoundingClientRect();
-                   var rect = node.getBoundingClientRect();
-
-                   combo
-                       .style('left', (rect.left + 5 - containerRect.left) + 'px')
-                       .style('width', (rect.width - 10) + 'px')
-                       .style('top', (rect.height + rect.top - containerRect.top) + 'px');
-               }
-
-
-               // Dispatches an 'accept' event
-               // Then hides the combobox.
-               function accept(d) {
-                   _cancelFetch = true;
-                   var thiz = input.node();
-
-                   if (d) {   // user clicked on a suggestion
-                       utilGetSetValue(input, d.value);    // replace field contents
-                       utilTriggerEvent(input, 'change');
-                   }
+       /**
+        * Gets the timestamp of the number of milliseconds that have elapsed since
+        * the Unix epoch (1 January 1970 00:00:00 UTC).
+        *
+        * @static
+        * @memberOf _
+        * @since 2.4.0
+        * @category Date
+        * @returns {number} Returns the timestamp.
+        * @example
+        *
+        * _.defer(function(stamp) {
+        *   console.log(_.now() - stamp);
+        * }, _.now());
+        * // => Logs the number of milliseconds it took for the deferred invocation.
+        */
 
-                   // clear (and keep) selection
-                   var val = utilGetSetValue(input);
-                   thiz.setSelectionRange(val.length, val.length);
+       var now$1 = function now() {
+         return root$1.Date.now();
+       };
 
-                   d = _fetched[val];
-                   dispatch$1.call('accept', thiz, d, val);
-                   hide();
-               }
+       /** Built-in value references. */
 
+       var _Symbol = root$1.Symbol;
 
-               // Dispatches an 'cancel' event
-               // Then hides the combobox.
-               function cancel() {
-                   _cancelFetch = true;
-                   var thiz = input.node();
+       /** Used for built-in method references. */
 
-                   // clear (and remove) selection, and replace field contents
-                   var val = utilGetSetValue(input);
-                   var start = input.property('selectionStart');
-                   var end = input.property('selectionEnd');
-                   val = val.slice(0, start) + val.slice(end);
-                   utilGetSetValue(input, val);
-                   thiz.setSelectionRange(val.length, val.length);
+       var objectProto = Object.prototype;
+       /** Used to check objects for own properties. */
 
-                   dispatch$1.call('cancel', thiz);
-                   hide();
-               }
+       var hasOwnProperty$1 = objectProto.hasOwnProperty;
+       /**
+        * Used to resolve the
+        * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
+        * of values.
+        */
 
-           };
+       var nativeObjectToString = objectProto.toString;
+       /** Built-in value references. */
 
+       var symToStringTag = _Symbol ? _Symbol.toStringTag : undefined;
+       /**
+        * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.
+        *
+        * @private
+        * @param {*} value The value to query.
+        * @returns {string} Returns the raw `toStringTag`.
+        */
 
-           combobox.canAutocomplete = function(val) {
-               if (!arguments.length) return _canAutocomplete;
-               _canAutocomplete = val;
-               return combobox;
-           };
+       function getRawTag(value) {
+         var isOwn = hasOwnProperty$1.call(value, symToStringTag),
+             tag = value[symToStringTag];
 
-           combobox.caseSensitive = function(val) {
-               if (!arguments.length) return _caseSensitive;
-               _caseSensitive = val;
-               return combobox;
-           };
+         try {
+           value[symToStringTag] = undefined;
+           var unmasked = true;
+         } catch (e) {}
 
-           combobox.data = function(val) {
-               if (!arguments.length) return _data;
-               _data = val;
-               return combobox;
-           };
+         var result = nativeObjectToString.call(value);
 
-           combobox.fetcher = function(val) {
-               if (!arguments.length) return _fetcher;
-               _fetcher = val;
-               return combobox;
-           };
+         if (unmasked) {
+           if (isOwn) {
+             value[symToStringTag] = tag;
+           } else {
+             delete value[symToStringTag];
+           }
+         }
 
-           combobox.minItems = function(val) {
-               if (!arguments.length) return _minItems;
-               _minItems = val;
-               return combobox;
-           };
+         return result;
+       }
 
-           combobox.itemsMouseEnter = function(val) {
-               if (!arguments.length) return _mouseEnterHandler;
-               _mouseEnterHandler = val;
-               return combobox;
-           };
+       /** Used for built-in method references. */
+       var objectProto$1 = Object.prototype;
+       /**
+        * Used to resolve the
+        * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)
+        * of values.
+        */
 
-           combobox.itemsMouseLeave = function(val) {
-               if (!arguments.length) return _mouseLeaveHandler;
-               _mouseLeaveHandler = val;
-               return combobox;
-           };
+       var nativeObjectToString$1 = objectProto$1.toString;
+       /**
+        * Converts `value` to a string using `Object.prototype.toString`.
+        *
+        * @private
+        * @param {*} value The value to convert.
+        * @returns {string} Returns the converted string.
+        */
 
-           return utilRebind(combobox, dispatch$1, 'on');
+       function objectToString$1(value) {
+         return nativeObjectToString$1.call(value);
        }
 
+       /** `Object#toString` result references. */
+
+       var nullTag = '[object Null]',
+           undefinedTag = '[object Undefined]';
+       /** Built-in value references. */
 
-       uiCombobox.off = function(input, context) {
-           input
-               .on('focus.combo-input', null)
-               .on('blur.combo-input', null)
-               .on('keydown.combo-input', null)
-               .on('keyup.combo-input', null)
-               .on('input.combo-input', null)
-               .on('mousedown.combo-input', null)
-               .on('mouseup.combo-input', null);
+       var symToStringTag$1 = _Symbol ? _Symbol.toStringTag : undefined;
+       /**
+        * The base implementation of `getTag` without fallbacks for buggy environments.
+        *
+        * @private
+        * @param {*} value The value to query.
+        * @returns {string} Returns the `toStringTag`.
+        */
 
+       function baseGetTag(value) {
+         if (value == null) {
+           return value === undefined ? undefinedTag : nullTag;
+         }
 
-           context.container()
-               .on('scroll.combo-scroll', null);
-       };
+         return symToStringTag$1 && symToStringTag$1 in Object(value) ? getRawTag(value) : objectToString$1(value);
+       }
 
-       // toggles the visibility of ui elements, using a combination of the
-       // hide class, which sets display=none, and a d3 transition for opacity.
-       // this will cause blinking when called repeatedly, so check that the
-       // value actually changes between calls.
-       function uiToggle(show, callback) {
-           return function(selection) {
-               selection
-                   .style('opacity', show ? 0 : 1)
-                   .classed('hide', false)
-                   .transition()
-                   .style('opacity', show ? 1 : 0)
-                   .on('end', function() {
-                       select(this)
-                           .classed('hide', !show)
-                           .style('opacity', null);
-                       if (callback) callback.apply(this);
-                   });
-           };
+       /**
+        * Checks if `value` is object-like. A value is object-like if it's not `null`
+        * and has a `typeof` result of "object".
+        *
+        * @static
+        * @memberOf _
+        * @since 4.0.0
+        * @category Lang
+        * @param {*} value The value to check.
+        * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
+        * @example
+        *
+        * _.isObjectLike({});
+        * // => true
+        *
+        * _.isObjectLike([1, 2, 3]);
+        * // => true
+        *
+        * _.isObjectLike(_.noop);
+        * // => false
+        *
+        * _.isObjectLike(null);
+        * // => false
+        */
+       function isObjectLike(value) {
+         return value != null && _typeof(value) == 'object';
        }
 
-       function uiDisclosure(context, key, expandedDefault) {
-           var dispatch$1 = dispatch('toggled');
-           var _expanded;
-           var _title = utilFunctor('');
-           var _updatePreference = true;
-           var _content = function () {};
+       /** `Object#toString` result references. */
 
+       var symbolTag = '[object Symbol]';
+       /**
+        * Checks if `value` is classified as a `Symbol` primitive or object.
+        *
+        * @static
+        * @memberOf _
+        * @since 4.0.0
+        * @category Lang
+        * @param {*} value The value to check.
+        * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.
+        * @example
+        *
+        * _.isSymbol(Symbol.iterator);
+        * // => true
+        *
+        * _.isSymbol('abc');
+        * // => false
+        */
 
-           var disclosure = function(selection) {
+       function isSymbol$1(value) {
+         return _typeof(value) == 'symbol' || isObjectLike(value) && baseGetTag(value) == symbolTag;
+       }
 
-               if (_expanded === undefined || _expanded === null) {
-                   // loading _expanded here allows it to be reset by calling `disclosure.expanded(null)`
+       /** Used as references for various `Number` constants. */
 
-                   var preference = corePreferences('disclosure.' + key + '.expanded');
-                   _expanded = preference === null ? !!expandedDefault : (preference === 'true');
-               }
+       var NAN = 0 / 0;
+       /** Used to match leading and trailing whitespace. */
 
-               var hideToggle = selection.selectAll('.hide-toggle-' + key)
-                   .data([0]);
+       var reTrim = /^\s+|\s+$/g;
+       /** Used to detect bad signed hexadecimal string values. */
 
-               // enter
-               var hideToggleEnter = hideToggle.enter()
-                   .append('a')
-                   .attr('href', '#')
-                   .attr('class', 'hide-toggle hide-toggle-' + key)
-                   .call(svgIcon('', 'pre-text', 'hide-toggle-icon'));
+       var reIsBadHex = /^[-+]0x[0-9a-f]+$/i;
+       /** Used to detect binary string values. */
 
-               hideToggleEnter
-                   .append('span')
-                   .attr('class', 'hide-toggle-text');
+       var reIsBinary = /^0b[01]+$/i;
+       /** Used to detect octal string values. */
 
-               // update
-               hideToggle = hideToggleEnter
-                   .merge(hideToggle);
+       var reIsOctal = /^0o[0-7]+$/i;
+       /** Built-in method references without a dependency on `root`. */
 
-               hideToggle
-                   .on('click', toggle)
-                   .classed('expanded', _expanded);
+       var freeParseInt = parseInt;
+       /**
+        * Converts `value` to a number.
+        *
+        * @static
+        * @memberOf _
+        * @since 4.0.0
+        * @category Lang
+        * @param {*} value The value to process.
+        * @returns {number} Returns the number.
+        * @example
+        *
+        * _.toNumber(3.2);
+        * // => 3.2
+        *
+        * _.toNumber(Number.MIN_VALUE);
+        * // => 5e-324
+        *
+        * _.toNumber(Infinity);
+        * // => Infinity
+        *
+        * _.toNumber('3.2');
+        * // => 3.2
+        */
 
-               hideToggle.selectAll('.hide-toggle-text')
-                   .text(_title());
+       function toNumber$1(value) {
+         if (typeof value == 'number') {
+           return value;
+         }
 
-               hideToggle.selectAll('.hide-toggle-icon')
-                   .attr('xlink:href', _expanded ? '#iD-icon-down'
-                       : (_mainLocalizer.textDirection() === 'rtl') ? '#iD-icon-backward' : '#iD-icon-forward'
-                   );
+         if (isSymbol$1(value)) {
+           return NAN;
+         }
 
+         if (isObject$1(value)) {
+           var other = typeof value.valueOf == 'function' ? value.valueOf() : value;
+           value = isObject$1(other) ? other + '' : other;
+         }
 
-               var wrap = selection.selectAll('.disclosure-wrap')
-                   .data([0]);
+         if (typeof value != 'string') {
+           return value === 0 ? value : +value;
+         }
 
-               // enter/update
-               wrap = wrap.enter()
-                   .append('div')
-                   .attr('class', 'disclosure-wrap disclosure-wrap-' + key)
-                   .merge(wrap)
-                   .classed('hide', !_expanded);
+         value = value.replace(reTrim, '');
+         var isBinary = reIsBinary.test(value);
+         return isBinary || reIsOctal.test(value) ? freeParseInt(value.slice(2), isBinary ? 2 : 8) : reIsBadHex.test(value) ? NAN : +value;
+       }
 
-               if (_expanded) {
-                   wrap
-                       .call(_content);
-               }
+       /** Error message constants. */
 
+       var FUNC_ERROR_TEXT = 'Expected a function';
+       /* Built-in method references for those with the same name as other `lodash` methods. */
 
-               function toggle() {
-                   event.preventDefault();
+       var nativeMax = Math.max,
+           nativeMin = Math.min;
+       /**
+        * Creates a debounced function that delays invoking `func` until after `wait`
+        * milliseconds have elapsed since the last time the debounced function was
+        * invoked. The debounced function comes with a `cancel` method to cancel
+        * delayed `func` invocations and a `flush` method to immediately invoke them.
+        * Provide `options` to indicate whether `func` should be invoked on the
+        * leading and/or trailing edge of the `wait` timeout. The `func` is invoked
+        * with the last arguments provided to the debounced function. Subsequent
+        * calls to the debounced function return the result of the last `func`
+        * invocation.
+        *
+        * **Note:** If `leading` and `trailing` options are `true`, `func` is
+        * invoked on the trailing edge of the timeout only if the debounced function
+        * is invoked more than once during the `wait` timeout.
+        *
+        * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
+        * until to the next tick, similar to `setTimeout` with a timeout of `0`.
+        *
+        * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
+        * for details over the differences between `_.debounce` and `_.throttle`.
+        *
+        * @static
+        * @memberOf _
+        * @since 0.1.0
+        * @category Function
+        * @param {Function} func The function to debounce.
+        * @param {number} [wait=0] The number of milliseconds to delay.
+        * @param {Object} [options={}] The options object.
+        * @param {boolean} [options.leading=false]
+        *  Specify invoking on the leading edge of the timeout.
+        * @param {number} [options.maxWait]
+        *  The maximum time `func` is allowed to be delayed before it's invoked.
+        * @param {boolean} [options.trailing=true]
+        *  Specify invoking on the trailing edge of the timeout.
+        * @returns {Function} Returns the new debounced function.
+        * @example
+        *
+        * // Avoid costly calculations while the window size is in flux.
+        * jQuery(window).on('resize', _.debounce(calculateLayout, 150));
+        *
+        * // Invoke `sendMail` when clicked, debouncing subsequent calls.
+        * jQuery(element).on('click', _.debounce(sendMail, 300, {
+        *   'leading': true,
+        *   'trailing': false
+        * }));
+        *
+        * // Ensure `batchLog` is invoked once after 1 second of debounced calls.
+        * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });
+        * var source = new EventSource('/stream');
+        * jQuery(source).on('message', debounced);
+        *
+        * // Cancel the trailing debounced invocation.
+        * jQuery(window).on('popstate', debounced.cancel);
+        */
 
-                   _expanded = !_expanded;
+       function debounce(func, wait, options) {
+         var lastArgs,
+             lastThis,
+             maxWait,
+             result,
+             timerId,
+             lastCallTime,
+             lastInvokeTime = 0,
+             leading = false,
+             maxing = false,
+             trailing = true;
 
-                   if (_updatePreference) {
-                       corePreferences('disclosure.' + key + '.expanded', _expanded);
-                   }
+         if (typeof func != 'function') {
+           throw new TypeError(FUNC_ERROR_TEXT);
+         }
 
-                   hideToggle
-                       .classed('expanded', _expanded);
+         wait = toNumber$1(wait) || 0;
 
-                   hideToggle.selectAll('.hide-toggle-icon')
-                       .attr('xlink:href', _expanded ? '#iD-icon-down'
-                           : (_mainLocalizer.textDirection() === 'rtl') ? '#iD-icon-backward' : '#iD-icon-forward'
-                       );
+         if (isObject$1(options)) {
+           leading = !!options.leading;
+           maxing = 'maxWait' in options;
+           maxWait = maxing ? nativeMax(toNumber$1(options.maxWait) || 0, wait) : maxWait;
+           trailing = 'trailing' in options ? !!options.trailing : trailing;
+         }
 
-                   wrap
-                       .call(uiToggle(_expanded));
+         function invokeFunc(time) {
+           var args = lastArgs,
+               thisArg = lastThis;
+           lastArgs = lastThis = undefined;
+           lastInvokeTime = time;
+           result = func.apply(thisArg, args);
+           return result;
+         }
 
-                   if (_expanded) {
-                       wrap
-                           .call(_content);
-                   }
+         function leadingEdge(time) {
+           // Reset any `maxWait` timer.
+           lastInvokeTime = time; // Start the timer for the trailing edge.
 
-                   dispatch$1.call('toggled', this, _expanded);
-               }
-           };
+           timerId = setTimeout(timerExpired, wait); // Invoke the leading edge.
 
+           return leading ? invokeFunc(time) : result;
+         }
 
-           disclosure.title = function(val) {
-               if (!arguments.length) return _title;
-               _title = utilFunctor(val);
-               return disclosure;
-           };
+         function remainingWait(time) {
+           var timeSinceLastCall = time - lastCallTime,
+               timeSinceLastInvoke = time - lastInvokeTime,
+               timeWaiting = wait - timeSinceLastCall;
+           return maxing ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke) : timeWaiting;
+         }
 
+         function shouldInvoke(time) {
+           var timeSinceLastCall = time - lastCallTime,
+               timeSinceLastInvoke = time - lastInvokeTime; // Either this is the first call, activity has stopped and we're at the
+           // trailing edge, the system time has gone backwards and we're treating
+           // it as the trailing edge, or we've hit the `maxWait` limit.
 
-           disclosure.expanded = function(val) {
-               if (!arguments.length) return _expanded;
-               _expanded = val;
-               return disclosure;
-           };
+           return lastCallTime === undefined || timeSinceLastCall >= wait || timeSinceLastCall < 0 || maxing && timeSinceLastInvoke >= maxWait;
+         }
 
+         function timerExpired() {
+           var time = now$1();
 
-           disclosure.updatePreference = function(val) {
-               if (!arguments.length) return _updatePreference;
-               _updatePreference = val;
-               return disclosure;
-           };
+           if (shouldInvoke(time)) {
+             return trailingEdge(time);
+           } // Restart the timer.
 
 
-           disclosure.content = function(val) {
-               if (!arguments.length) return _content;
-               _content = val;
-               return disclosure;
-           };
+           timerId = setTimeout(timerExpired, remainingWait(time));
+         }
 
+         function trailingEdge(time) {
+           timerId = undefined; // Only invoke if we have `lastArgs` which means `func` has been
+           // debounced at least once.
 
-           return utilRebind(disclosure, dispatch$1, 'on');
-       }
+           if (trailing && lastArgs) {
+             return invokeFunc(time);
+           }
 
-       // A unit of controls or info to be used in a layout, such as within a pane.
-       // Can be labeled and collapsible.
-       function uiSection(id, context) {
+           lastArgs = lastThis = undefined;
+           return result;
+         }
 
-           var _classes = utilFunctor('');
-           var _shouldDisplay;
-           var _content;
+         function cancel() {
+           if (timerId !== undefined) {
+             clearTimeout(timerId);
+           }
 
-           var _disclosure;
-           var _title;
-           var _expandedByDefault = utilFunctor(true);
-           var _disclosureContent;
-           var _disclosureExpanded;
+           lastInvokeTime = 0;
+           lastArgs = lastCallTime = lastThis = timerId = undefined;
+         }
 
-           var _containerSelection = select(null);
+         function flush() {
+           return timerId === undefined ? result : trailingEdge(now$1());
+         }
 
-           var section = {
-               id: id
-           };
+         function debounced() {
+           var time = now$1(),
+               isInvoking = shouldInvoke(time);
+           lastArgs = arguments;
+           lastThis = this;
+           lastCallTime = time;
 
-           section.classes = function(val) {
-               if (!arguments.length) return _classes;
-               _classes = utilFunctor(val);
-               return section;
-           };
+           if (isInvoking) {
+             if (timerId === undefined) {
+               return leadingEdge(lastCallTime);
+             }
 
-           section.title = function(val) {
-               if (!arguments.length) return _title;
-               _title = utilFunctor(val);
-               return section;
-           };
+             if (maxing) {
+               // Handle invocations in a tight loop.
+               clearTimeout(timerId);
+               timerId = setTimeout(timerExpired, wait);
+               return invokeFunc(lastCallTime);
+             }
+           }
 
-           section.expandedByDefault = function(val) {
-               if (!arguments.length) return _expandedByDefault;
-               _expandedByDefault = utilFunctor(val);
-               return section;
-           };
+           if (timerId === undefined) {
+             timerId = setTimeout(timerExpired, wait);
+           }
 
-           section.shouldDisplay = function(val) {
-               if (!arguments.length) return _shouldDisplay;
-               _shouldDisplay = utilFunctor(val);
-               return section;
-           };
+           return result;
+         }
 
-           section.content = function(val) {
-               if (!arguments.length) return _content;
-               _content = val;
-               return section;
-           };
+         debounced.cancel = cancel;
+         debounced.flush = flush;
+         return debounced;
+       }
 
-           section.disclosureContent = function(val) {
-               if (!arguments.length) return _disclosureContent;
-               _disclosureContent = val;
-               return section;
-           };
+       /** Error message constants. */
 
-           section.disclosureExpanded = function(val) {
-               if (!arguments.length) return _disclosureExpanded;
-               _disclosureExpanded = val;
-               return section;
-           };
+       var FUNC_ERROR_TEXT$1 = 'Expected a function';
+       /**
+        * Creates a throttled function that only invokes `func` at most once per
+        * every `wait` milliseconds. The throttled function comes with a `cancel`
+        * method to cancel delayed `func` invocations and a `flush` method to
+        * immediately invoke them. Provide `options` to indicate whether `func`
+        * should be invoked on the leading and/or trailing edge of the `wait`
+        * timeout. The `func` is invoked with the last arguments provided to the
+        * throttled function. Subsequent calls to the throttled function return the
+        * result of the last `func` invocation.
+        *
+        * **Note:** If `leading` and `trailing` options are `true`, `func` is
+        * invoked on the trailing edge of the timeout only if the throttled function
+        * is invoked more than once during the `wait` timeout.
+        *
+        * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred
+        * until to the next tick, similar to `setTimeout` with a timeout of `0`.
+        *
+        * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)
+        * for details over the differences between `_.throttle` and `_.debounce`.
+        *
+        * @static
+        * @memberOf _
+        * @since 0.1.0
+        * @category Function
+        * @param {Function} func The function to throttle.
+        * @param {number} [wait=0] The number of milliseconds to throttle invocations to.
+        * @param {Object} [options={}] The options object.
+        * @param {boolean} [options.leading=true]
+        *  Specify invoking on the leading edge of the timeout.
+        * @param {boolean} [options.trailing=true]
+        *  Specify invoking on the trailing edge of the timeout.
+        * @returns {Function} Returns the new throttled function.
+        * @example
+        *
+        * // Avoid excessively updating the position while scrolling.
+        * jQuery(window).on('scroll', _.throttle(updatePosition, 100));
+        *
+        * // Invoke `renewToken` when the click event is fired, but not more than once every 5 minutes.
+        * var throttled = _.throttle(renewToken, 300000, { 'trailing': false });
+        * jQuery(element).on('click', throttled);
+        *
+        * // Cancel the trailing throttled invocation.
+        * jQuery(window).on('popstate', throttled.cancel);
+        */
 
-           // may be called multiple times
-           section.render = function(selection) {
+       function throttle(func, wait, options) {
+         var leading = true,
+             trailing = true;
 
-               _containerSelection = selection
-                   .selectAll('.section-' + id)
-                   .data([0]);
+         if (typeof func != 'function') {
+           throw new TypeError(FUNC_ERROR_TEXT$1);
+         }
 
-               var sectionEnter = _containerSelection
-                   .enter()
-                   .append('div')
-                   .attr('class', 'section section-' + id + ' ' + (_classes && _classes() || ''));
+         if (isObject$1(options)) {
+           leading = 'leading' in options ? !!options.leading : leading;
+           trailing = 'trailing' in options ? !!options.trailing : trailing;
+         }
 
-               _containerSelection = sectionEnter
-                   .merge(_containerSelection);
+         return debounce(func, wait, {
+           'leading': leading,
+           'maxWait': wait,
+           'trailing': trailing
+         });
+       }
 
-               _containerSelection
-                   .call(renderContent);
-           };
+       var hashes = createCommonjsModule(function (module, exports) {
+         /**
+          * jshashes - https://github.com/h2non/jshashes
+          * Released under the "New BSD" license
+          *
+          * Algorithms specification:
+          *
+          * MD5 - http://www.ietf.org/rfc/rfc1321.txt
+          * RIPEMD-160 - http://homes.esat.kuleuven.be/~bosselae/ripemd160.html
+          * SHA1   - http://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf
+          * SHA256 - http://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf
+          * SHA512 - http://csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf
+          * HMAC - http://www.ietf.org/rfc/rfc2104.txt
+          */
+         (function () {
+           var Hashes;
 
-           section.reRender = function() {
-               _containerSelection
-                   .call(renderContent);
-           };
+           function utf8Encode(str) {
+             var x,
+                 y,
+                 output = '',
+                 i = -1,
+                 l;
 
-           section.selection = function() {
-               return _containerSelection;
-           };
+             if (str && str.length) {
+               l = str.length;
 
-           section.disclosure = function() {
-               return _disclosure;
-           };
+               while ((i += 1) < l) {
+                 /* Decode utf-16 surrogate pairs */
+                 x = str.charCodeAt(i);
+                 y = i + 1 < l ? str.charCodeAt(i + 1) : 0;
 
-           // may be called multiple times
-           function renderContent(selection) {
-               if (_shouldDisplay) {
-                   var shouldDisplay = _shouldDisplay();
-                   selection.classed('hide', !shouldDisplay);
-                   if (!shouldDisplay) {
-                       selection.html('');
-                       return;
-                   }
-               }
+                 if (0xD800 <= x && x <= 0xDBFF && 0xDC00 <= y && y <= 0xDFFF) {
+                   x = 0x10000 + ((x & 0x03FF) << 10) + (y & 0x03FF);
+                   i += 1;
+                 }
+                 /* Encode output as utf-8 */
 
-               if (_disclosureContent) {
-                   if (!_disclosure) {
-                       _disclosure = uiDisclosure(context, id.replace(/-/g, '_'), _expandedByDefault())
-                           .title(_title || '')
-                           /*.on('toggled', function(expanded) {
-                               if (expanded) { selection.node().parentNode.scrollTop += 200; }
-                           })*/
-                           .content(_disclosureContent);
-                   }
-                   if (_disclosureExpanded !== undefined) {
-                       _disclosure.expanded(_disclosureExpanded);
-                       _disclosureExpanded = undefined;
-                   }
-                   selection
-                       .call(_disclosure);
 
-                   return;
+                 if (x <= 0x7F) {
+                   output += String.fromCharCode(x);
+                 } else if (x <= 0x7FF) {
+                   output += String.fromCharCode(0xC0 | x >>> 6 & 0x1F, 0x80 | x & 0x3F);
+                 } else if (x <= 0xFFFF) {
+                   output += String.fromCharCode(0xE0 | x >>> 12 & 0x0F, 0x80 | x >>> 6 & 0x3F, 0x80 | x & 0x3F);
+                 } else if (x <= 0x1FFFFF) {
+                   output += String.fromCharCode(0xF0 | x >>> 18 & 0x07, 0x80 | x >>> 12 & 0x3F, 0x80 | x >>> 6 & 0x3F, 0x80 | x & 0x3F);
+                 }
                }
+             }
 
-               if (_content) {
-                   selection
-                       .call(_content);
-               }
+             return output;
            }
 
-           return section;
-       }
+           function utf8Decode(str) {
+             var i,
+                 ac,
+                 c1,
+                 c2,
+                 c3,
+                 arr = [],
+                 l;
+             i = ac = c1 = c2 = c3 = 0;
 
-       // Pass `which` object of the form:
-       // {
-       //   key: 'string',     // required
-       //   value: 'string'    // optional
-       // }
-       //   -or-
-       // {
-       //   rtype: 'string'    // relation type  (e.g. 'multipolygon')
-       // }
-       //   -or-
-       // {
-       //   qid: 'string'      // brand wikidata  (e.g. 'Q37158')
-       // }
-       //
-       function uiTagReference(what) {
-           var wikibase = what.qid ? services.wikidata : services.osmWikibase;
-           var tagReference = {};
+             if (str && str.length) {
+               l = str.length;
+               str += '';
 
-           var _button = select(null);
-           var _body = select(null);
-           var _loaded;
-           var _showing;
+               while (i < l) {
+                 c1 = str.charCodeAt(i);
+                 ac += 1;
 
+                 if (c1 < 128) {
+                   arr[ac] = String.fromCharCode(c1);
+                   i += 1;
+                 } else if (c1 > 191 && c1 < 224) {
+                   c2 = str.charCodeAt(i + 1);
+                   arr[ac] = String.fromCharCode((c1 & 31) << 6 | c2 & 63);
+                   i += 2;
+                 } else {
+                   c2 = str.charCodeAt(i + 1);
+                   c3 = str.charCodeAt(i + 2);
+                   arr[ac] = String.fromCharCode((c1 & 15) << 12 | (c2 & 63) << 6 | c3 & 63);
+                   i += 3;
+                 }
+               }
+             }
 
-           function load() {
-               if (!wikibase) return;
+             return arr.join('');
+           }
+           /**
+            * Add integers, wrapping at 2^32. This uses 16-bit operations internally
+            * to work around bugs in some JS interpreters.
+            */
 
-               _button
-                   .classed('tag-reference-loading', true);
 
-               wikibase.getDocs(what, gotDocs);
+           function safe_add(x, y) {
+             var lsw = (x & 0xFFFF) + (y & 0xFFFF),
+                 msw = (x >> 16) + (y >> 16) + (lsw >> 16);
+             return msw << 16 | lsw & 0xFFFF;
            }
+           /**
+            * Bitwise rotate a 32-bit number to the left.
+            */
 
 
-           function gotDocs(err, docs) {
-               _body.html('');
+           function bit_rol(num, cnt) {
+             return num << cnt | num >>> 32 - cnt;
+           }
+           /**
+            * Convert a raw string to a hex string
+            */
 
-               if (!docs || !docs.title) {
-                   _body
-                       .append('p')
-                       .attr('class', 'tag-reference-description')
-                       .text(_t('inspector.no_documentation_key'));
-                   done();
-                   return;
-               }
 
-               if (docs.imageURL) {
-                   _body
-                       .append('img')
-                       .attr('class', 'tag-reference-wiki-image')
-                       .attr('src', docs.imageURL)
-                       .on('load', function() { done(); })
-                       .on('error', function() { select(this).remove(); done(); });
-               } else {
-                   done();
-               }
-
-               _body
-                   .append('p')
-                   .attr('class', 'tag-reference-description')
-                   .text(docs.description || _t('inspector.no_documentation_key'))
-                   .append('a')
-                   .attr('class', 'tag-reference-edit')
-                   .attr('target', '_blank')
-                   .attr('tabindex', -1)
-                   .attr('title', _t('inspector.edit_reference'))
-                   .attr('href', docs.editURL)
-                   .call(svgIcon('#iD-icon-edit', 'inline'));
-
-               if (docs.wiki) {
-                   _body
-                     .append('a')
-                     .attr('class', 'tag-reference-link')
-                     .attr('target', '_blank')
-                     .attr('tabindex', -1)
-                     .attr('href', docs.wiki.url)
-                     .call(svgIcon('#iD-icon-out-link', 'inline'))
-                     .append('span')
-                     .text(_t(docs.wiki.text));
-               }
-
-               // Add link to info about "good changeset comments" - #2923
-               if (what.key === 'comment') {
-                   _body
-                       .append('a')
-                       .attr('class', 'tag-reference-comment-link')
-                       .attr('target', '_blank')
-                       .attr('tabindex', -1)
-                       .call(svgIcon('#iD-icon-out-link', 'inline'))
-                       .attr('href', _t('commit.about_changeset_comments_link'))
-                       .append('span')
-                       .text(_t('commit.about_changeset_comments'));
-               }
-           }
+           function rstr2hex(input, hexcase) {
+             var hex_tab = hexcase ? '0123456789ABCDEF' : '0123456789abcdef',
+                 output = '',
+                 x,
+                 i = 0,
+                 l = input.length;
 
+             for (; i < l; i += 1) {
+               x = input.charCodeAt(i);
+               output += hex_tab.charAt(x >>> 4 & 0x0F) + hex_tab.charAt(x & 0x0F);
+             }
 
-           function done() {
-               _loaded = true;
+             return output;
+           }
+           /**
+            * Convert an array of big-endian words to a string
+            */
 
-               _button
-                   .classed('tag-reference-loading', false);
 
-               _body
-                   .classed('expanded', true)
-                   .transition()
-                   .duration(200)
-                   .style('max-height', '200px')
-                   .style('opacity', '1');
+           function binb2rstr(input) {
+             var i,
+                 l = input.length * 32,
+                 output = '';
 
-               _showing = true;
+             for (i = 0; i < l; i += 8) {
+               output += String.fromCharCode(input[i >> 5] >>> 24 - i % 32 & 0xFF);
+             }
 
-               _button.selectAll('svg.icon use').each(function() {
-                   var iconUse = select(this);
-                   if (iconUse.attr('href') === '#iD-icon-info') {
-                       iconUse.attr('href', '#iD-icon-info-filled');
-                   }
-               });
+             return output;
            }
+           /**
+            * Convert an array of little-endian words to a string
+            */
 
 
-           function hide() {
-               _body
-                   .transition()
-                   .duration(200)
-                   .style('max-height', '0px')
-                   .style('opacity', '0')
-                   .on('end', function () {
-                       _body.classed('expanded', false);
-                   });
-
-               _showing = false;
+           function binl2rstr(input) {
+             var i,
+                 l = input.length * 32,
+                 output = '';
 
-               _button.selectAll('svg.icon use').each(function() {
-                   var iconUse = select(this);
-                   if (iconUse.attr('href') === '#iD-icon-info-filled') {
-                       iconUse.attr('href', '#iD-icon-info');
-                   }
-               });
+             for (i = 0; i < l; i += 8) {
+               output += String.fromCharCode(input[i >> 5] >>> i % 32 & 0xFF);
+             }
 
+             return output;
            }
+           /**
+            * Convert a raw string to an array of little-endian words
+            * Characters >255 have their high-byte silently ignored.
+            */
 
 
-           tagReference.button = function(selection, klass, iconName) {
-               _button = selection.selectAll('.tag-reference-button')
-                   .data([0]);
+           function rstr2binl(input) {
+             var i,
+                 l = input.length * 8,
+                 output = Array(input.length >> 2),
+                 lo = output.length;
 
-               _button = _button.enter()
-                   .append('button')
-                   .attr('class', 'tag-reference-button ' + klass)
-                   .attr('title', _t('icons.information'))
-                   .attr('tabindex', -1)
-                   .call(svgIcon('#iD-icon-' + (iconName || 'inspect')))
-                   .merge(_button);
+             for (i = 0; i < lo; i += 1) {
+               output[i] = 0;
+             }
 
-               _button
-                   .on('click', function () {
-                       event.stopPropagation();
-                       event.preventDefault();
-                       this.blur();    // avoid keeping focus on the button - #4641
-                       if (_showing) {
-                           hide();
-                       } else if (_loaded) {
-                           done();
-                       } else {
-                           load();
-                       }
-                   });
-           };
+             for (i = 0; i < l; i += 8) {
+               output[i >> 5] |= (input.charCodeAt(i / 8) & 0xFF) << i % 32;
+             }
 
+             return output;
+           }
+           /**
+            * Convert a raw string to an array of big-endian words
+            * Characters >255 have their high-byte silently ignored.
+            */
 
-           tagReference.body = function(selection) {
-               var itemID = what.qid || what.rtype || (what.key + '-' + what.value);
-               _body = selection.selectAll('.tag-reference-body')
-                   .data([itemID], function(d) { return d; });
 
-               _body.exit()
-                   .remove();
+           function rstr2binb(input) {
+             var i,
+                 l = input.length * 8,
+                 output = Array(input.length >> 2),
+                 lo = output.length;
 
-               _body = _body.enter()
-                   .append('div')
-                   .attr('class', 'tag-reference-body')
-                   .style('max-height', '0')
-                   .style('opacity', '0')
-                   .merge(_body);
+             for (i = 0; i < lo; i += 1) {
+               output[i] = 0;
+             }
 
-               if (_showing === false) {
-                   hide();
-               }
-           };
+             for (i = 0; i < l; i += 8) {
+               output[i >> 5] |= (input.charCodeAt(i / 8) & 0xFF) << 24 - i % 32;
+             }
 
+             return output;
+           }
+           /**
+            * Convert a raw string to an arbitrary string encoding
+            */
 
-           tagReference.showing = function(val) {
-               if (!arguments.length) return _showing;
-               _showing = val;
-               return tagReference;
-           };
 
+           function rstr2any(input, encoding) {
+             var divisor = encoding.length,
+                 remainders = Array(),
+                 i,
+                 q,
+                 x,
+                 ld,
+                 quotient,
+                 dividend,
+                 output,
+                 full_length;
+             /* Convert to an array of 16-bit big-endian values, forming the dividend */
 
-           return tagReference;
-       }
+             dividend = Array(Math.ceil(input.length / 2));
+             ld = dividend.length;
 
-       function uiSectionRawTagEditor(id, context) {
+             for (i = 0; i < ld; i += 1) {
+               dividend[i] = input.charCodeAt(i * 2) << 8 | input.charCodeAt(i * 2 + 1);
+             }
+             /**
+              * Repeatedly perform a long division. The binary array forms the dividend,
+              * the length of the encoding is the divisor. Once computed, the quotient
+              * forms the dividend for the next step. We stop when the dividend is zerHashes.
+              * All remainders are stored for later use.
+              */
 
-           var section = uiSection(id, context)
-               .classes('raw-tag-editor')
-               .title(function() {
-                   var count = Object.keys(_tags).filter(function(d) { return d; }).length;
-                   return _t('inspector.title_count', { title: _t('inspector.tags'), count: count });
-               })
-               .expandedByDefault(false)
-               .disclosureContent(renderDisclosureContent);
-
-           var taginfo = services.taginfo;
-           var dispatch$1 = dispatch('change');
-           var availableViews = [
-               { id: 'text', icon: '#fas-i-cursor' },
-               { id: 'list', icon: '#fas-th-list' }
-           ];
-
-           var _tagView = (corePreferences('raw-tag-editor-view') || 'list');   // 'list, 'text'
-           var _readOnlyTags = [];
-           // the keys in the order we want them to display
-           var _orderedKeys = [];
-           var _showBlank = false;
-           var _pendingChange = null;
-           var _state;
-           var _presets;
-           var _tags;
-           var _entityIDs;
-
-           function renderDisclosureContent(wrap) {
-
-               // remove deleted keys
-               _orderedKeys = _orderedKeys.filter(function(key) {
-                   return _tags[key] !== undefined;
-               });
 
-               // When switching to a different entity or changing the state (hover/select)
-               // reorder the keys alphabetically.
-               // We trigger this by emptying the `_orderedKeys` array, then it will be rebuilt here.
-               // Otherwise leave their order alone - #5857, #5927
-               var all = Object.keys(_tags).sort();
-               var missingKeys = utilArrayDifference(all, _orderedKeys);
-               for (var i in missingKeys) {
-                   _orderedKeys.push(missingKeys[i]);
-               }
+             while (dividend.length > 0) {
+               quotient = Array();
+               x = 0;
 
-               // assemble row data
-               var rowData = _orderedKeys.map(function(key, i) {
-                   return { index: i, key: key, value: _tags[key] };
-               });
+               for (i = 0; i < dividend.length; i += 1) {
+                 x = (x << 16) + dividend[i];
+                 q = Math.floor(x / divisor);
+                 x -= q * divisor;
 
-               // append blank row last, if necessary
-               if (!rowData.length || _showBlank) {
-                   _showBlank = false;
-                   rowData.push({ index: rowData.length, key: '', value: '' });
+                 if (quotient.length > 0 || q > 0) {
+                   quotient[quotient.length] = q;
+                 }
                }
 
+               remainders[remainders.length] = x;
+               dividend = quotient;
+             }
+             /* Convert the remainders to the output string */
 
-               // View Options
-               var options = wrap.selectAll('.raw-tag-options')
-                   .data([0]);
-
-               options.exit()
-                   .remove();
-
-               var optionsEnter = options.enter()
-                   .insert('div', ':first-child')
-                   .attr('class', 'raw-tag-options');
 
-               var optionEnter = optionsEnter.selectAll('.raw-tag-option')
-                   .data(availableViews, function(d) { return d.id; })
-                   .enter();
+             output = '';
 
-               optionEnter
-                   .append('button')
-                   .attr('class', function(d) {
-                       return 'raw-tag-option raw-tag-option-' + d.id + (_tagView === d.id ? ' selected' : '');
-                   })
-                   .attr('title', function(d) { return _t('icons.' + d.id); })
-                   .on('click', function(d) {
-                       _tagView = d.id;
-                       corePreferences('raw-tag-editor-view', d.id);
+             for (i = remainders.length - 1; i >= 0; i--) {
+               output += encoding.charAt(remainders[i]);
+             }
+             /* Append leading zero equivalents */
 
-                       wrap.selectAll('.raw-tag-option')
-                           .classed('selected', function(datum) { return datum === d; });
 
-                       wrap.selectAll('.tag-text')
-                           .classed('hide', (d.id !== 'text'))
-                           .each(setTextareaHeight);
+             full_length = Math.ceil(input.length * 8 / (Math.log(encoding.length) / Math.log(2)));
 
-                       wrap.selectAll('.tag-list, .add-row')
-                           .classed('hide', (d.id !== 'list'));
-                   })
-                   .each(function(d) {
-                       select(this)
-                           .call(svgIcon(d.icon));
-                   });
+             for (i = output.length; i < full_length; i += 1) {
+               output = encoding[0] + output;
+             }
 
+             return output;
+           }
+           /**
+            * Convert a raw string to a base-64 string
+            */
 
-               // View as Text
-               var textData = rowsToText(rowData);
-               var textarea = wrap.selectAll('.tag-text')
-                   .data([0]);
 
-               textarea = textarea.enter()
-                   .append('textarea')
-                   .attr('class', 'tag-text' + (_tagView !== 'text' ? ' hide' : ''))
-                   .call(utilNoAuto)
-                   .attr('placeholder', _t('inspector.key_value'))
-                   .attr('spellcheck', 'false')
-                   .merge(textarea);
+           function rstr2b64(input, b64pad) {
+             var tab = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
+                 output = '',
+                 len = input.length,
+                 i,
+                 j,
+                 triplet;
+             b64pad = b64pad || '=';
+
+             for (i = 0; i < len; i += 3) {
+               triplet = input.charCodeAt(i) << 16 | (i + 1 < len ? input.charCodeAt(i + 1) << 8 : 0) | (i + 2 < len ? input.charCodeAt(i + 2) : 0);
+
+               for (j = 0; j < 4; j += 1) {
+                 if (i * 8 + j * 6 > input.length * 8) {
+                   output += b64pad;
+                 } else {
+                   output += tab.charAt(triplet >>> 6 * (3 - j) & 0x3F);
+                 }
+               }
+             }
 
-               textarea
-                   .call(utilGetSetValue, textData)
-                   .each(setTextareaHeight)
-                   .on('input', setTextareaHeight)
-                   .on('blur', textChanged)
-                   .on('change', textChanged);
+             return output;
+           }
 
+           Hashes = {
+             /**
+              * @property {String} version
+              * @readonly
+              */
+             VERSION: '1.0.6',
 
-               // View as List
-               var list = wrap.selectAll('.tag-list')
-                   .data([0]);
+             /**
+              * @member Hashes
+              * @class Base64
+              * @constructor
+              */
+             Base64: function Base64() {
+               // private properties
+               var tab = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
+                   pad = '=',
+                   // URL encoding support @todo
+               utf8 = true; // by default enable UTF-8 support encoding
+               // public method for encoding
+
+               this.encode = function (input) {
+                 var i,
+                     j,
+                     triplet,
+                     output = '',
+                     len = input.length;
+                 pad = pad || '=';
+                 input = utf8 ? utf8Encode(input) : input;
+
+                 for (i = 0; i < len; i += 3) {
+                   triplet = input.charCodeAt(i) << 16 | (i + 1 < len ? input.charCodeAt(i + 1) << 8 : 0) | (i + 2 < len ? input.charCodeAt(i + 2) : 0);
+
+                   for (j = 0; j < 4; j += 1) {
+                     if (i * 8 + j * 6 > len * 8) {
+                       output += pad;
+                     } else {
+                       output += tab.charAt(triplet >>> 6 * (3 - j) & 0x3F);
+                     }
+                   }
+                 }
 
-               list = list.enter()
-                   .append('ul')
-                   .attr('class', 'tag-list' + (_tagView !== 'list' ? ' hide' : ''))
-                   .merge(list);
+                 return output;
+               }; // public method for decoding
+
+
+               this.decode = function (input) {
+                 // var b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
+                 var i,
+                     o1,
+                     o2,
+                     o3,
+                     h1,
+                     h2,
+                     h3,
+                     h4,
+                     bits,
+                     ac,
+                     dec = '',
+                     arr = [];
+
+                 if (!input) {
+                   return input;
+                 }
 
+                 i = ac = 0;
+                 input = input.replace(new RegExp('\\' + pad, 'gi'), ''); // use '='
+                 //input += '';
+
+                 do {
+                   // unpack four hexets into three octets using index points in b64
+                   h1 = tab.indexOf(input.charAt(i += 1));
+                   h2 = tab.indexOf(input.charAt(i += 1));
+                   h3 = tab.indexOf(input.charAt(i += 1));
+                   h4 = tab.indexOf(input.charAt(i += 1));
+                   bits = h1 << 18 | h2 << 12 | h3 << 6 | h4;
+                   o1 = bits >> 16 & 0xff;
+                   o2 = bits >> 8 & 0xff;
+                   o3 = bits & 0xff;
+                   ac += 1;
+
+                   if (h3 === 64) {
+                     arr[ac] = String.fromCharCode(o1);
+                   } else if (h4 === 64) {
+                     arr[ac] = String.fromCharCode(o1, o2);
+                   } else {
+                     arr[ac] = String.fromCharCode(o1, o2, o3);
+                   }
+                 } while (i < input.length);
 
-               // Container for the Add button
-               var addRowEnter = wrap.selectAll('.add-row')
-                   .data([0])
-                   .enter()
-                   .append('div')
-                   .attr('class', 'add-row' + (_tagView !== 'list' ? ' hide' : ''));
+                 dec = arr.join('');
+                 dec = utf8 ? utf8Decode(dec) : dec;
+                 return dec;
+               }; // set custom pad string
 
-               addRowEnter
-                   .append('button')
-                   .attr('class', 'add-tag')
-                   .call(svgIcon('#iD-icon-plus', 'light'))
-                   .on('click', addTag);
 
-               addRowEnter
-                   .append('div')
-                   .attr('class', 'space-value');   // preserve space
+               this.setPad = function (str) {
+                 pad = str || pad;
+                 return this;
+               }; // set custom tab string characters
 
-               addRowEnter
-                   .append('div')
-                   .attr('class', 'space-buttons');  // preserve space
 
+               this.setTab = function (str) {
+                 tab = str || tab;
+                 return this;
+               };
 
-               // Tag list items
-               var items = list.selectAll('.tag-row')
-                   .data(rowData, function(d) { return d.key; });
+               this.setUTF8 = function (bool) {
+                 if (typeof bool === 'boolean') {
+                   utf8 = bool;
+                 }
 
-               items.exit()
-                   .each(unbind)
-                   .remove();
+                 return this;
+               };
+             },
 
+             /**
+              * CRC-32 calculation
+              * @member Hashes
+              * @method CRC32
+              * @static
+              * @param {String} str Input String
+              * @return {String}
+              */
+             CRC32: function CRC32(str) {
+               var crc = 0,
+                   x = 0,
+                   y = 0,
+                   table,
+                   i,
+                   iTop;
+               str = utf8Encode(str);
+               table = ['00000000 77073096 EE0E612C 990951BA 076DC419 706AF48F E963A535 9E6495A3 0EDB8832 ', '79DCB8A4 E0D5E91E 97D2D988 09B64C2B 7EB17CBD E7B82D07 90BF1D91 1DB71064 6AB020F2 F3B97148 ', '84BE41DE 1ADAD47D 6DDDE4EB F4D4B551 83D385C7 136C9856 646BA8C0 FD62F97A 8A65C9EC 14015C4F ', '63066CD9 FA0F3D63 8D080DF5 3B6E20C8 4C69105E D56041E4 A2677172 3C03E4D1 4B04D447 D20D85FD ', 'A50AB56B 35B5A8FA 42B2986C DBBBC9D6 ACBCF940 32D86CE3 45DF5C75 DCD60DCF ABD13D59 26D930AC ', '51DE003A C8D75180 BFD06116 21B4F4B5 56B3C423 CFBA9599 B8BDA50F 2802B89E 5F058808 C60CD9B2 ', 'B10BE924 2F6F7C87 58684C11 C1611DAB B6662D3D 76DC4190 01DB7106 98D220BC EFD5102A 71B18589 ', '06B6B51F 9FBFE4A5 E8B8D433 7807C9A2 0F00F934 9609A88E E10E9818 7F6A0DBB 086D3D2D 91646C97 ', 'E6635C01 6B6B51F4 1C6C6162 856530D8 F262004E 6C0695ED 1B01A57B 8208F4C1 F50FC457 65B0D9C6 ', '12B7E950 8BBEB8EA FCB9887C 62DD1DDF 15DA2D49 8CD37CF3 FBD44C65 4DB26158 3AB551CE A3BC0074 ', 'D4BB30E2 4ADFA541 3DD895D7 A4D1C46D D3D6F4FB 4369E96A 346ED9FC AD678846 DA60B8D0 44042D73 ', '33031DE5 AA0A4C5F DD0D7CC9 5005713C 270241AA BE0B1010 C90C2086 5768B525 206F85B3 B966D409 ', 'CE61E49F 5EDEF90E 29D9C998 B0D09822 C7D7A8B4 59B33D17 2EB40D81 B7BD5C3B C0BA6CAD EDB88320 ', '9ABFB3B6 03B6E20C 74B1D29A EAD54739 9DD277AF 04DB2615 73DC1683 E3630B12 94643B84 0D6D6A3E ', '7A6A5AA8 E40ECF0B 9309FF9D 0A00AE27 7D079EB1 F00F9344 8708A3D2 1E01F268 6906C2FE F762575D ', '806567CB 196C3671 6E6B06E7 FED41B76 89D32BE0 10DA7A5A 67DD4ACC F9B9DF6F 8EBEEFF9 17B7BE43 ', '60B08ED5 D6D6A3E8 A1D1937E 38D8C2C4 4FDFF252 D1BB67F1 A6BC5767 3FB506DD 48B2364B D80D2BDA ', 'AF0A1B4C 36034AF6 41047A60 DF60EFC3 A867DF55 316E8EEF 4669BE79 CB61B38C BC66831A 256FD2A0 ', '5268E236 CC0C7795 BB0B4703 220216B9 5505262F C5BA3BBE B2BD0B28 2BB45A92 5CB36A04 C2D7FFA7 ', 'B5D0CF31 2CD99E8B 5BDEAE1D 9B64C2B0 EC63F226 756AA39C 026D930A 9C0906A9 EB0E363F 72076785 ', '05005713 95BF4A82 E2B87A14 7BB12BAE 0CB61B38 92D28E9B E5D5BE0D 7CDCEFB7 0BDBDF21 86D3D2D4 ', 'F1D4E242 68DDB3F8 1FDA836E 81BE16CD F6B9265B 6FB077E1 18B74777 88085AE6 FF0F6A70 66063BCA ', '11010B5C 8F659EFF F862AE69 616BFFD3 166CCF45 A00AE278 D70DD2EE 4E048354 3903B3C2 A7672661 ', 'D06016F7 4969474D 3E6E77DB AED16A4A D9D65ADC 40DF0B66 37D83BF0 A9BCAE53 DEBB9EC5 47B2CF7F ', '30B5FFE9 BDBDF21C CABAC28A 53B39330 24B4A3A6 BAD03605 CDD70693 54DE5729 23D967BF B3667A2E ', 'C4614AB8 5D681B02 2A6F2B94 B40BBE37 C30C8EA1 5A05DF1B 2D02EF8D'].join('');
+               crc = crc ^ -1;
+
+               for (i = 0, iTop = str.length; i < iTop; i += 1) {
+                 y = (crc ^ str.charCodeAt(i)) & 0xFF;
+                 x = '0x' + table.substr(y * 9, 8);
+                 crc = crc >>> 8 ^ x;
+               } // always return a positive number (that's what >>> 0 does)
+
+
+               return (crc ^ -1) >>> 0;
+             },
 
-               // Enter
-               var itemsEnter = items.enter()
-                   .append('li')
-                   .attr('class', 'tag-row')
-                   .classed('readonly', isReadOnly);
+             /**
+              * @member Hashes
+              * @class MD5
+              * @constructor
+              * @param {Object} [config]
+              *
+              * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
+              * Digest Algorithm, as defined in RFC 1321.
+              * Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
+              * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
+              * See <http://pajhome.org.uk/crypt/md5> for more infHashes.
+              */
+             MD5: function MD5(options) {
+               /**
+                * Private config properties. You may need to tweak these to be compatible with
+                * the server-side, but the defaults work in most cases.
+                * See {@link Hashes.MD5#method-setUpperCase} and {@link Hashes.SHA1#method-setUpperCase}
+                */
+               var hexcase = options && typeof options.uppercase === 'boolean' ? options.uppercase : false,
+                   // hexadecimal output case format. false - lowercase; true - uppercase
+               b64pad = options && typeof options.pad === 'string' ? options.pad : '=',
+                   // base-64 pad character. Defaults to '=' for strict RFC compliance
+               utf8 = options && typeof options.utf8 === 'boolean' ? options.utf8 : true; // enable/disable utf8 encoding
+               // privileged (public) methods
+
+               this.hex = function (s) {
+                 return rstr2hex(rstr(s), hexcase);
+               };
 
-               var innerWrap = itemsEnter.append('div')
-                   .attr('class', 'inner-wrap');
+               this.b64 = function (s) {
+                 return rstr2b64(rstr(s), b64pad);
+               };
 
-               innerWrap
-                   .append('div')
-                   .attr('class', 'key-wrap')
-                   .append('input')
-                   .property('type', 'text')
-                   .attr('class', 'key')
-                   .call(utilNoAuto)
-                   .on('blur', keyChange)
-                   .on('change', keyChange);
-
-               innerWrap
-                   .append('div')
-                   .attr('class', 'value-wrap')
-                   .append('input')
-                   .property('type', 'text')
-                   .attr('class', 'value')
-                   .call(utilNoAuto)
-                   .on('blur', valueChange)
-                   .on('change', valueChange)
-                   .on('keydown.push-more', pushMore);
-
-               innerWrap
-                   .append('button')
-                   .attr('tabindex', -1)
-                   .attr('class', 'form-field-button remove')
-                   .attr('title', _t('icons.remove'))
-                   .call(svgIcon('#iD-operation-delete'));
-
-
-               // Update
-               items = items
-                   .merge(itemsEnter)
-                   .sort(function(a, b) { return a.index - b.index; });
-
-               items
-                   .each(function(d) {
-                       var row = select(this);
-                       var key = row.select('input.key');      // propagate bound data
-                       var value = row.select('input.value');  // propagate bound data
-
-                       if (_entityIDs && taginfo && _state !== 'hover') {
-                           bindTypeahead(key, value);
-                       }
+               this.any = function (s, e) {
+                 return rstr2any(rstr(s), e);
+               };
 
-                       var reference;
+               this.raw = function (s) {
+                 return rstr(s);
+               };
 
-                       if (typeof d.value !== 'string') {
-                           reference = uiTagReference({ key: d.key });
-                       } else {
-                           var isRelation = _entityIDs && _entityIDs.some(function(entityID) {
-                               return context.entity(entityID).type === 'relation';
-                           });
-                           if (isRelation && d.key === 'type') {
-                               reference = uiTagReference({ rtype: d.value });
-                           } else {
-                               reference = uiTagReference({ key: d.key, value: d.value });
-                           }
-                       }
+               this.hex_hmac = function (k, d) {
+                 return rstr2hex(rstr_hmac(k, d), hexcase);
+               };
 
-                       if (_state === 'hover') {
-                           reference.showing(false);
-                       }
+               this.b64_hmac = function (k, d) {
+                 return rstr2b64(rstr_hmac(k, d), b64pad);
+               };
 
-                       row.select('.inner-wrap')      // propagate bound data
-                           .call(reference.button);
+               this.any_hmac = function (k, d, e) {
+                 return rstr2any(rstr_hmac(k, d), e);
+               };
+               /**
+                * Perform a simple self-test to see if the VM is working
+                * @return {String} Hexadecimal hash sample
+                */
 
-                       row.call(reference.body);
 
-                       row.select('button.remove');   // propagate bound data
-                   });
+               this.vm_test = function () {
+                 return hex('abc').toLowerCase() === '900150983cd24fb0d6963f7d28e17f72';
+               };
+               /**
+                * Enable/disable uppercase hexadecimal returned string
+                * @param {Boolean}
+                * @return {Object} this
+                */
 
-               items.selectAll('input.key')
-                   .attr('title', function(d) { return d.key; })
-                   .call(utilGetSetValue, function(d) { return d.key; })
-                   .attr('readonly', function(d) {
-                       return (isReadOnly(d) || (typeof d.value !== 'string')) || null;
-                   });
 
-               items.selectAll('input.value')
-                   .attr('title', function(d) {
-                       return Array.isArray(d.value) ? d.value.filter(Boolean).join('\n') : d.value;
-                   })
-                   .classed('mixed', function(d) {
-                       return Array.isArray(d.value);
-                   })
-                   .attr('placeholder', function(d) {
-                       return typeof d.value === 'string' ? null : _t('inspector.multiple_values');
-                   })
-                   .call(utilGetSetValue, function(d) {
-                       return typeof d.value === 'string' ? d.value : '';
-                   })
-                   .attr('readonly', function(d) {
-                       return isReadOnly(d) || null;
-                   });
+               this.setUpperCase = function (a) {
+                 if (typeof a === 'boolean') {
+                   hexcase = a;
+                 }
 
-               items.selectAll('button.remove')
-                   .on(('PointerEvent' in window ? 'pointer' : 'mouse') + 'down', removeTag);  // 'click' fires too late - #5878
+                 return this;
+               };
+               /**
+                * Defines a base64 pad string
+                * @param {String} Pad
+                * @return {Object} this
+                */
 
-           }
 
-           function isReadOnly(d) {
-               for (var i = 0; i < _readOnlyTags.length; i++) {
-                   if (d.key.match(_readOnlyTags[i]) !== null) {
-                       return true;
-                   }
-               }
-               return false;
-           }
+               this.setPad = function (a) {
+                 b64pad = a || b64pad;
+                 return this;
+               };
+               /**
+                * Defines a base64 pad string
+                * @param {Boolean}
+                * @return {Object} [this]
+                */
 
-           function setTextareaHeight() {
-               if (_tagView !== 'text') return;
 
-               var selection = select(this);
-               selection.style('height', null);
-               selection.style('height', selection.node().scrollHeight + 5 + 'px');
-           }
+               this.setUTF8 = function (a) {
+                 if (typeof a === 'boolean') {
+                   utf8 = a;
+                 }
 
-           function stringify(s) {
-               return JSON.stringify(s).slice(1, -1);   // without leading/trailing "
-           }
+                 return this;
+               }; // private methods
 
-           function unstringify(s) {
-               var leading = '';
-               var trailing = '';
-               if (s.length < 1 || s.charAt(0) !== '"') {
-                   leading = '"';
-               }
-               if (s.length < 2 || s.charAt(s.length - 1) !== '"' ||
-                   (s.charAt(s.length - 1) === '"' && s.charAt(s.length - 2) === '\\')
-               ) {
-                   trailing = '"';
-               }
-               return JSON.parse(leading + s + trailing);
-           }
+               /**
+                * Calculate the MD5 of a raw string
+                */
 
-           function rowsToText(rows) {
-               var str = rows
-                   .filter(function(row) { return row.key && row.key.trim() !== ''; })
-                   .map(function(row) {
-                       var rawVal = row.value;
-                       if (typeof rawVal !== 'string') rawVal = '*';
-                       var val = rawVal ? stringify(rawVal) : '';
-                       return stringify(row.key) + '=' + val;
-                   })
-                   .join('\n');
 
-               if (_state !== 'hover' && str.length) {
-                   return str + '\n';
+               function rstr(s) {
+                 s = utf8 ? utf8Encode(s) : s;
+                 return binl2rstr(binl(rstr2binl(s), s.length * 8));
                }
-               return  str;
-           }
-
-           function textChanged() {
-               var newText = this.value.trim();
-               var newTags = {};
-               newText.split('\n').forEach(function(row) {
-                   var m = row.match(/^\s*([^=]+)=(.*)$/);
-                   if (m !== null) {
-                       var k = context.cleanTagKey(unstringify(m[1].trim()));
-                       var v = context.cleanTagValue(unstringify(m[2].trim()));
-                       newTags[k] = v;
-                   }
-               });
+               /**
+                * Calculate the HMAC-MD5, of a key and some data (raw strings)
+                */
 
-               var tagDiff = utilTagDiff(_tags, newTags);
-               if (!tagDiff.length) return;
 
-               _pendingChange  = _pendingChange || {};
+               function rstr_hmac(key, data) {
+                 var bkey, ipad, opad, hash, i;
+                 key = utf8 ? utf8Encode(key) : key;
+                 data = utf8 ? utf8Encode(data) : data;
+                 bkey = rstr2binl(key);
 
-               tagDiff.forEach(function(change) {
-                   if (isReadOnly({ key: change.key })) return;
-
-                   // skip unchanged multiselection placeholders
-                   if (change.newVal === '*' && typeof change.oldVal !== 'string') return;
+                 if (bkey.length > 16) {
+                   bkey = binl(bkey, key.length * 8);
+                 }
 
-                   if (change.type === '-') {
-                       _pendingChange[change.key] = undefined;
-                   } else if (change.type === '+') {
-                       _pendingChange[change.key] = change.newVal || '';
-                   }
-               });
+                 ipad = Array(16), opad = Array(16);
 
-               if (Object.keys(_pendingChange).length === 0) {
-                   _pendingChange = null;
-                   return;
-               }
+                 for (i = 0; i < 16; i += 1) {
+                   ipad[i] = bkey[i] ^ 0x36363636;
+                   opad[i] = bkey[i] ^ 0x5C5C5C5C;
+                 }
 
-               scheduleChange();
-           }
+                 hash = binl(ipad.concat(rstr2binl(data)), 512 + data.length * 8);
+                 return binl2rstr(binl(opad.concat(hash), 512 + 128));
+               }
+               /**
+                * Calculate the MD5 of an array of little-endian words, and a bit length.
+                */
+
+
+               function binl(x, len) {
+                 var i,
+                     olda,
+                     oldb,
+                     oldc,
+                     oldd,
+                     a = 1732584193,
+                     b = -271733879,
+                     c = -1732584194,
+                     d = 271733878;
+                 /* append padding */
+
+                 x[len >> 5] |= 0x80 << len % 32;
+                 x[(len + 64 >>> 9 << 4) + 14] = len;
+
+                 for (i = 0; i < x.length; i += 16) {
+                   olda = a;
+                   oldb = b;
+                   oldc = c;
+                   oldd = d;
+                   a = md5_ff(a, b, c, d, x[i + 0], 7, -680876936);
+                   d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586);
+                   c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819);
+                   b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330);
+                   a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897);
+                   d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426);
+                   c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341);
+                   b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983);
+                   a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416);
+                   d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417);
+                   c = md5_ff(c, d, a, b, x[i + 10], 17, -42063);
+                   b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162);
+                   a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682);
+                   d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101);
+                   c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290);
+                   b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329);
+                   a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510);
+                   d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632);
+                   c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713);
+                   b = md5_gg(b, c, d, a, x[i + 0], 20, -373897302);
+                   a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691);
+                   d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083);
+                   c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335);
+                   b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848);
+                   a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438);
+                   d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690);
+                   c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961);
+                   b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501);
+                   a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467);
+                   d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784);
+                   c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473);
+                   b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734);
+                   a = md5_hh(a, b, c, d, x[i + 5], 4, -378558);
+                   d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463);
+                   c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562);
+                   b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556);
+                   a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060);
+                   d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353);
+                   c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632);
+                   b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640);
+                   a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174);
+                   d = md5_hh(d, a, b, c, x[i + 0], 11, -358537222);
+                   c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979);
+                   b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189);
+                   a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487);
+                   d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835);
+                   c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520);
+                   b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651);
+                   a = md5_ii(a, b, c, d, x[i + 0], 6, -198630844);
+                   d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415);
+                   c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905);
+                   b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055);
+                   a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571);
+                   d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606);
+                   c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523);
+                   b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799);
+                   a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359);
+                   d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744);
+                   c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380);
+                   b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649);
+                   a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070);
+                   d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379);
+                   c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259);
+                   b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551);
+                   a = safe_add(a, olda);
+                   b = safe_add(b, oldb);
+                   c = safe_add(c, oldc);
+                   d = safe_add(d, oldd);
+                 }
 
-           function pushMore() {
-               // if pressing Tab on the last value field with content, add a blank row
-               if (event.keyCode === 9 && !event.shiftKey &&
-                   section.selection().selectAll('.tag-list li:last-child input.value').node() === this &&
-                   utilGetSetValue(select(this))) {
-                   addTag();
+                 return Array(a, b, c, d);
                }
-           }
+               /**
+                * These functions implement the four basic operations the algorithm uses.
+                */
 
-           function bindTypeahead(key, value) {
-               if (isReadOnly(key.datum())) return;
 
-               if (Array.isArray(value.datum().value)) {
-                   value.call(uiCombobox(context, 'tag-value')
-                       .minItems(1)
-                       .fetcher(function(value, callback) {
-                           var keyString = utilGetSetValue(key);
-                           if (!_tags[keyString]) return;
-                           var data = _tags[keyString].filter(Boolean).map(function(tagValue) {
-                               return {
-                                   value: tagValue,
-                                   title: tagValue
-                               };
-                           });
-                           callback(data);
-                       }));
-                   return;
+               function md5_cmn(q, a, b, x, s, t) {
+                 return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b);
                }
 
-               var geometry = context.graph().geometry(_entityIDs[0]);
-
-               key.call(uiCombobox(context, 'tag-key')
-                   .fetcher(function(value, callback) {
-                       taginfo.keys({
-                           debounce: true,
-                           geometry: geometry,
-                           query: value
-                       }, function(err, data) {
-                           if (!err) {
-                               var filtered = data.filter(function(d) { return _tags[d.value] === undefined; });
-                               callback(sort(value, filtered));
-                           }
-                       });
-                   }));
-
-               value.call(uiCombobox(context, 'tag-value')
-                   .fetcher(function(value, callback) {
-                       taginfo.values({
-                           debounce: true,
-                           key: utilGetSetValue(key),
-                           geometry: geometry,
-                           query: value
-                       }, function(err, data) {
-                           if (!err) callback(sort(value, data));
-                       });
-                   }));
-
-
-               function sort(value, data) {
-                   var sameletter = [];
-                   var other = [];
-                   for (var i = 0; i < data.length; i++) {
-                       if (data[i].value.substring(0, value.length) === value) {
-                           sameletter.push(data[i]);
-                       } else {
-                           other.push(data[i]);
-                       }
-                   }
-                   return sameletter.concat(other);
+               function md5_ff(a, b, c, d, x, s, t) {
+                 return md5_cmn(b & c | ~b & d, a, b, x, s, t);
                }
-           }
-
-           function unbind() {
-               var row = select(this);
-
-               row.selectAll('input.key')
-                   .call(uiCombobox.off, context);
-
-               row.selectAll('input.value')
-                   .call(uiCombobox.off, context);
-           }
-
-           function keyChange(d) {
-               if (select(this).attr('readonly')) return;
-
-               var kOld = d.key;
 
-               // exit if we are currently about to delete this row anyway - #6366
-               if (_pendingChange && _pendingChange.hasOwnProperty(kOld) && _pendingChange[kOld] === undefined) return;
-
-               var kNew = context.cleanTagKey(this.value.trim());
-
-               // allow no change if the key should be readonly
-               if (isReadOnly({ key: kNew })) {
-                   this.value = kOld;
-                   return;
+               function md5_gg(a, b, c, d, x, s, t) {
+                 return md5_cmn(b & d | c & ~d, a, b, x, s, t);
                }
 
-               if (kNew &&
-                   kNew !== kOld &&
-                   _tags[kNew] !== undefined) {
-                   // new key is already in use, switch focus to the existing row
-
-                   this.value = kOld;                // reset the key
-                   section.selection().selectAll('.tag-list input.value')
-                       .each(function(d) {
-                           if (d.key === kNew) {     // send focus to that other value combo instead
-                               var input = select(this).node();
-                               input.focus();
-                               input.select();
-                           }
-                       });
-                   return;
+               function md5_hh(a, b, c, d, x, s, t) {
+                 return md5_cmn(b ^ c ^ d, a, b, x, s, t);
                }
 
-
-               var row = this.parentNode.parentNode;
-               var inputVal = select(row).selectAll('input.value');
-               var vNew = context.cleanTagValue(utilGetSetValue(inputVal));
-
-               _pendingChange = _pendingChange || {};
-
-               if (kOld) {
-                   _pendingChange[kOld] = undefined;
+               function md5_ii(a, b, c, d, x, s, t) {
+                 return md5_cmn(c ^ (b | ~d), a, b, x, s, t);
                }
+             },
 
-               _pendingChange[kNew] = vNew;
-
-               // update the ordered key index so this row doesn't change position
-               var existingKeyIndex = _orderedKeys.indexOf(kOld);
-               if (existingKeyIndex !== -1) _orderedKeys[existingKeyIndex] = kNew;
-
-               d.key = kNew;    // update datum to avoid exit/enter on tag update
-               d.value = vNew;
-
-               this.value = kNew;
-               utilGetSetValue(inputVal, vNew);
-               scheduleChange();
-           }
-
-           function valueChange(d) {
-               if (isReadOnly(d)) return;
-
-               // exit if this is a multiselection and no value was entered
-               if (typeof d.value !== 'string' && !this.value) return;
+             /**
+              * @member Hashes
+              * @class Hashes.SHA1
+              * @param {Object} [config]
+              * @constructor
+              *
+              * A JavaScript implementation of the Secure Hash Algorithm, SHA-1, as defined in FIPS 180-1
+              * Version 2.2 Copyright Paul Johnston 2000 - 2009.
+              * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
+              * See http://pajhome.org.uk/crypt/md5 for details.
+              */
+             SHA1: function SHA1(options) {
+               /**
+                * Private config properties. You may need to tweak these to be compatible with
+                * the server-side, but the defaults work in most cases.
+                * See {@link Hashes.MD5#method-setUpperCase} and {@link Hashes.SHA1#method-setUpperCase}
+                */
+               var hexcase = options && typeof options.uppercase === 'boolean' ? options.uppercase : false,
+                   // hexadecimal output case format. false - lowercase; true - uppercase
+               b64pad = options && typeof options.pad === 'string' ? options.pad : '=',
+                   // base-64 pad character. Defaults to '=' for strict RFC compliance
+               utf8 = options && typeof options.utf8 === 'boolean' ? options.utf8 : true; // enable/disable utf8 encoding
+               // public methods
+
+               this.hex = function (s) {
+                 return rstr2hex(rstr(s), hexcase);
+               };
 
-               // exit if we are currently about to delete this row anyway - #6366
-               if (_pendingChange && _pendingChange.hasOwnProperty(d.key) && _pendingChange[d.key] === undefined) return;
+               this.b64 = function (s) {
+                 return rstr2b64(rstr(s), b64pad);
+               };
 
-               _pendingChange = _pendingChange || {};
+               this.any = function (s, e) {
+                 return rstr2any(rstr(s), e);
+               };
 
-               _pendingChange[d.key] = context.cleanTagValue(this.value);
-               scheduleChange();
-           }
+               this.raw = function (s) {
+                 return rstr(s);
+               };
 
-           function removeTag(d) {
-               if (isReadOnly(d)) return;
+               this.hex_hmac = function (k, d) {
+                 return rstr2hex(rstr_hmac(k, d));
+               };
 
-               if (d.key === '') {    // removing the blank row
-                   _showBlank = false;
-                   section.reRender();
+               this.b64_hmac = function (k, d) {
+                 return rstr2b64(rstr_hmac(k, d), b64pad);
+               };
 
-               } else {
-                   // remove the key from the ordered key index
-                   _orderedKeys = _orderedKeys.filter(function(key) { return key !== d.key; });
+               this.any_hmac = function (k, d, e) {
+                 return rstr2any(rstr_hmac(k, d), e);
+               };
+               /**
+                * Perform a simple self-test to see if the VM is working
+                * @return {String} Hexadecimal hash sample
+                * @public
+                */
 
-                   _pendingChange  = _pendingChange || {};
-                   _pendingChange[d.key] = undefined;
-                   scheduleChange();
-               }
-           }
 
-           function addTag() {
-               // Delay render in case this click is blurring an edited combo.
-               // Without the setTimeout, the `content` render would wipe out the pending tag change.
-               window.setTimeout(function() {
-                   _showBlank = true;
-                   section.reRender();
-                   section.selection().selectAll('.tag-list li:last-child input.key').node().focus();
-               }, 20);
-           }
+               this.vm_test = function () {
+                 return hex('abc').toLowerCase() === '900150983cd24fb0d6963f7d28e17f72';
+               };
+               /**
+                * @description Enable/disable uppercase hexadecimal returned string
+                * @param {boolean}
+                * @return {Object} this
+                * @public
+                */
 
-           function scheduleChange() {
-               // Cache IDs in case the editor is reloaded before the change event is called. - #6028
-               var entityIDs = _entityIDs;
 
-               // Delay change in case this change is blurring an edited combo. - #5878
-               window.setTimeout(function() {
-                   if (!_pendingChange) return;
+               this.setUpperCase = function (a) {
+                 if (typeof a === 'boolean') {
+                   hexcase = a;
+                 }
 
-                   dispatch$1.call('change', this, entityIDs, _pendingChange);
-                   _pendingChange = null;
-               }, 10);
-           }
+                 return this;
+               };
+               /**
+                * @description Defines a base64 pad string
+                * @param {string} Pad
+                * @return {Object} this
+                * @public
+                */
 
 
-           section.state = function(val) {
-               if (!arguments.length) return _state;
-               if (_state !== val) {
-                   _orderedKeys = [];
-                   _state = val;
-               }
-               return section;
-           };
+               this.setPad = function (a) {
+                 b64pad = a || b64pad;
+                 return this;
+               };
+               /**
+                * @description Defines a base64 pad string
+                * @param {boolean}
+                * @return {Object} this
+                * @public
+                */
 
 
-           section.presets = function(val) {
-               if (!arguments.length) return _presets;
-               _presets = val;
-               if (_presets && _presets.length && _presets[0].isFallback()) {
-                   section.disclosureExpanded(true);
-               } else {
-                   section.disclosureExpanded(null);
-               }
-               return section;
-           };
+               this.setUTF8 = function (a) {
+                 if (typeof a === 'boolean') {
+                   utf8 = a;
+                 }
 
+                 return this;
+               }; // private methods
 
-           section.tags = function(val) {
-               if (!arguments.length) return _tags;
-               _tags = val;
-               return section;
-           };
+               /**
+                * Calculate the SHA-512 of a raw string
+                */
 
 
-           section.entityIDs = function(val) {
-               if (!arguments.length) return _entityIDs;
-               if (!_entityIDs || !val || !utilArrayIdentical(_entityIDs, val)) {
-                   _entityIDs = val;
-                   _orderedKeys = [];
+               function rstr(s) {
+                 s = utf8 ? utf8Encode(s) : s;
+                 return binb2rstr(binb(rstr2binb(s), s.length * 8));
                }
-               return section;
-           };
-
-
-           // pass an array of regular expressions to test against the tag key
-           section.readOnlyTags = function(val) {
-               if (!arguments.length) return _readOnlyTags;
-               _readOnlyTags = val;
-               return section;
-           };
-
-
-           return utilRebind(section, dispatch$1, 'on');
-       }
-
-       function uiDataEditor(context) {
-           var dataHeader = uiDataHeader();
-           var rawTagEditor = uiSectionRawTagEditor('custom-data-tag-editor', context)
-               .expandedByDefault(true)
-               .readOnlyTags([/./]);
-           var _datum;
-
-
-           function dataEditor(selection) {
-
-               var header = selection.selectAll('.header')
-                   .data([0]);
+               /**
+                * Calculate the HMAC-SHA1 of a key and some data (raw strings)
+                */
 
-               var headerEnter = header.enter()
-                   .append('div')
-                   .attr('class', 'header fillL');
-
-               headerEnter
-                   .append('button')
-                   .attr('class', 'close')
-                   .on('click', function() {
-                       context.enter(modeBrowse(context));
-                   })
-                   .call(svgIcon('#iD-icon-close'));
-
-               headerEnter
-                   .append('h3')
-                   .text(_t('map_data.title'));
-
-
-               var body = selection.selectAll('.body')
-                   .data([0]);
-
-               body = body.enter()
-                   .append('div')
-                   .attr('class', 'body')
-                   .merge(body);
-
-               var editor = body.selectAll('.data-editor')
-                   .data([0]);
 
-               // enter/update
-               editor.enter()
-                   .append('div')
-                   .attr('class', 'modal-section data-editor')
-                   .merge(editor)
-                   .call(dataHeader.datum(_datum));
-
-               var rte = body.selectAll('.raw-tag-editor')
-                   .data([0]);
+               function rstr_hmac(key, data) {
+                 var bkey, ipad, opad, i, hash;
+                 key = utf8 ? utf8Encode(key) : key;
+                 data = utf8 ? utf8Encode(data) : data;
+                 bkey = rstr2binb(key);
 
-               // enter/update
-               rte.enter()
-                   .append('div')
-                   .attr('class', 'raw-tag-editor data-editor')
-                   .merge(rte)
-                   .call(rawTagEditor
-                       .tags((_datum && _datum.properties) || {})
-                       .state('hover')
-                       .render
-                   )
-                   .selectAll('textarea.tag-text')
-                   .attr('readonly', true)
-                   .classed('readonly', true);
-           }
-
-
-           dataEditor.datum = function(val) {
-               if (!arguments.length) return _datum;
-               _datum = val;
-               return this;
-           };
+                 if (bkey.length > 16) {
+                   bkey = binb(bkey, key.length * 8);
+                 }
 
+                 ipad = Array(16), opad = Array(16);
 
-           return dataEditor;
-       }
+                 for (i = 0; i < 16; i += 1) {
+                   ipad[i] = bkey[i] ^ 0x36363636;
+                   opad[i] = bkey[i] ^ 0x5C5C5C5C;
+                 }
 
-       function modeSelectData(context, selectedDatum) {
-           var mode = {
-               id: 'select-data',
-               button: 'browse'
-           };
+                 hash = binb(ipad.concat(rstr2binb(data)), 512 + data.length * 8);
+                 return binb2rstr(binb(opad.concat(hash), 512 + 160));
+               }
+               /**
+                * Calculate the SHA-1 of an array of big-endian words, and a bit length
+                */
+
+
+               function binb(x, len) {
+                 var i,
+                     j,
+                     t,
+                     olda,
+                     oldb,
+                     oldc,
+                     oldd,
+                     olde,
+                     w = Array(80),
+                     a = 1732584193,
+                     b = -271733879,
+                     c = -1732584194,
+                     d = 271733878,
+                     e = -1009589776;
+                 /* append padding */
+
+                 x[len >> 5] |= 0x80 << 24 - len % 32;
+                 x[(len + 64 >> 9 << 4) + 15] = len;
+
+                 for (i = 0; i < x.length; i += 16) {
+                   olda = a;
+                   oldb = b;
+                   oldc = c;
+                   oldd = d;
+                   olde = e;
+
+                   for (j = 0; j < 80; j += 1) {
+                     if (j < 16) {
+                       w[j] = x[i + j];
+                     } else {
+                       w[j] = bit_rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1);
+                     }
 
-           var keybinding = utilKeybinding('select-data');
-           var dataEditor = uiDataEditor(context);
-
-           var behaviors = [
-               behaviorBreathe(),
-               behaviorHover(context),
-               behaviorSelect(context),
-               behaviorLasso(context),
-               modeDragNode(context).behavior,
-               modeDragNote(context).behavior
-           ];
-
-
-           // class the data as selected, or return to browse mode if the data is gone
-           function selectData(drawn) {
-               var selection = context.surface().selectAll('.layer-mapdata .data' + selectedDatum.__featurehash__);
-
-               if (selection.empty()) {
-                   // Return to browse mode if selected DOM elements have
-                   // disappeared because the user moved them out of view..
-                   var source = event && event.type === 'zoom' && event.sourceEvent;
-                   if (drawn && source && (source.type === 'pointermove' || source.type === 'mousemove' || source.type === 'touchmove')) {
-                       context.enter(modeBrowse(context));
+                     t = safe_add(safe_add(bit_rol(a, 5), sha1_ft(j, b, c, d)), safe_add(safe_add(e, w[j]), sha1_kt(j)));
+                     e = d;
+                     d = c;
+                     c = bit_rol(b, 30);
+                     b = a;
+                     a = t;
                    }
-               } else {
-                   selection.classed('selected', true);
-               }
-           }
-
-
-           function esc() {
-               if (context.container().select('.combobox').size()) return;
-               context.enter(modeBrowse(context));
-           }
-
-
-           mode.zoomToSelected = function() {
-               var extent = geoExtent(d3_geoBounds(selectedDatum));
-               context.map().centerZoomEase(extent.center(), context.map().trimmedExtentZoom(extent));
-           };
 
+                   a = safe_add(a, olda);
+                   b = safe_add(b, oldb);
+                   c = safe_add(c, oldc);
+                   d = safe_add(d, oldd);
+                   e = safe_add(e, olde);
+                 }
 
-           mode.enter = function() {
-               behaviors.forEach(context.install);
+                 return Array(a, b, c, d, e);
+               }
+               /**
+                * Perform the appropriate triplet combination function for the current
+                * iteration
+                */
 
-               keybinding
-                   .on(_t('inspector.zoom_to.key'), mode.zoomToSelected)
-                   .on('⎋', esc, true);
 
-               select(document)
-                   .call(keybinding);
+               function sha1_ft(t, b, c, d) {
+                 if (t < 20) {
+                   return b & c | ~b & d;
+                 }
 
-               selectData();
+                 if (t < 40) {
+                   return b ^ c ^ d;
+                 }
 
-               var sidebar = context.ui().sidebar;
-               sidebar.show(dataEditor.datum(selectedDatum));
+                 if (t < 60) {
+                   return b & c | b & d | c & d;
+                 }
 
-               // expand the sidebar, avoid obscuring the data if needed
-               var extent = geoExtent(d3_geoBounds(selectedDatum));
-               sidebar.expand(sidebar.intersects(extent));
+                 return b ^ c ^ d;
+               }
+               /**
+                * Determine the appropriate additive constant for the current iteration
+                */
 
-               context.map()
-                   .on('drawn.select-data', selectData);
-           };
 
+               function sha1_kt(t) {
+                 return t < 20 ? 1518500249 : t < 40 ? 1859775393 : t < 60 ? -1894007588 : -899497514;
+               }
+             },
 
-           mode.exit = function() {
-               behaviors.forEach(context.uninstall);
+             /**
+              * @class Hashes.SHA256
+              * @param {config}
+              *
+              * A JavaScript implementation of the Secure Hash Algorithm, SHA-256, as defined in FIPS 180-2
+              * Version 2.2 Copyright Angel Marin, Paul Johnston 2000 - 2009.
+              * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
+              * See http://pajhome.org.uk/crypt/md5 for details.
+              * Also http://anmar.eu.org/projects/jssha2/
+              */
+             SHA256: function SHA256(options) {
+               /**
+                * Private properties configuration variables. You may need to tweak these to be compatible with
+                * the server-side, but the defaults work in most cases.
+                * @see this.setUpperCase() method
+                * @see this.setPad() method
+                */
+               var hexcase = options && typeof options.uppercase === 'boolean' ? options.uppercase : false,
+                   // hexadecimal output case format. false - lowercase; true - uppercase  */
+               b64pad = options && typeof options.pad === 'string' ? options.pad : '=',
 
-               select(document)
-                   .call(keybinding.unbind);
+               /* base-64 pad character. Default '=' for strict RFC compliance   */
+               utf8 = options && typeof options.utf8 === 'boolean' ? options.utf8 : true,
 
-               context.surface()
-                   .selectAll('.layer-mapdata .selected')
-                   .classed('selected hover', false);
+               /* enable/disable utf8 encoding */
+               sha256_K;
+               /* privileged (public) methods */
 
-               context.map()
-                   .on('drawn.select-data', null);
+               this.hex = function (s) {
+                 return rstr2hex(rstr(s, utf8));
+               };
 
-               context.ui().sidebar
-                   .hide();
-           };
+               this.b64 = function (s) {
+                 return rstr2b64(rstr(s, utf8), b64pad);
+               };
 
+               this.any = function (s, e) {
+                 return rstr2any(rstr(s, utf8), e);
+               };
 
-           return mode;
-       }
+               this.raw = function (s) {
+                 return rstr(s, utf8);
+               };
 
-       function uiImproveOsmComments() {
-         let _qaItem;
+               this.hex_hmac = function (k, d) {
+                 return rstr2hex(rstr_hmac(k, d));
+               };
 
-         function issueComments(selection) {
-           // make the div immediately so it appears above the buttons
-           let comments = selection.selectAll('.comments-container')
-             .data([0]);
-
-           comments = comments.enter()
-             .append('div')
-               .attr('class', 'comments-container')
-             .merge(comments);
-
-           // must retrieve comments from API before they can be displayed
-           services.improveOSM.getComments(_qaItem)
-             .then(d => {
-               if (!d.comments) return; // nothing to do here
-
-               const commentEnter = comments.selectAll('.comment')
-                 .data(d.comments)
-                 .enter()
-                 .append('div')
-                   .attr('class', 'comment');
-
-               commentEnter
-                 .append('div')
-                   .attr('class', 'comment-avatar')
-                   .call(svgIcon('#iD-icon-avatar', 'comment-avatar-icon'));
-
-               const mainEnter = commentEnter
-                 .append('div')
-                 .attr('class', 'comment-main');
-
-               const metadataEnter = mainEnter
-                 .append('div')
-                   .attr('class', 'comment-metadata');
-
-               metadataEnter
-                 .append('div')
-                   .attr('class', 'comment-author')
-                   .each(function(d) {
-                     const osm = services.osm;
-                     let selection = select(this);
-                     if (osm && d.username) {
-                       selection = selection
-                         .append('a')
-                         .attr('class', 'comment-author-link')
-                         .attr('href', osm.userURL(d.username))
-                         .attr('tabindex', -1)
-                         .attr('target', '_blank');
-                     }
-                     selection
-                       .text(d => d.username);
-                   });
+               this.b64_hmac = function (k, d) {
+                 return rstr2b64(rstr_hmac(k, d), b64pad);
+               };
 
-               metadataEnter
-                 .append('div')
-                   .attr('class', 'comment-date')
-                   .text(d => _t('note.status.commented', { when: localeDateString(d.timestamp) }));
+               this.any_hmac = function (k, d, e) {
+                 return rstr2any(rstr_hmac(k, d), e);
+               };
+               /**
+                * Perform a simple self-test to see if the VM is working
+                * @return {String} Hexadecimal hash sample
+                * @public
+                */
 
-               mainEnter
-                 .append('div')
-                   .attr('class', 'comment-text')
-                 .append('p')
-                   .text(d => d.text);
-           })
-           .catch(err => {
-             console.log(err); // eslint-disable-line no-console
-           });
-         }
 
-         function localeDateString(s) {
-           if (!s) return null;
-           const options = { day: 'numeric', month: 'short', year: 'numeric' };
-           const d = new Date(s * 1000); // timestamp is served in seconds, date takes ms
-           if (isNaN(d.getTime())) return null;
-           return d.toLocaleDateString(_mainLocalizer.localeCode(), options);
-         }
+               this.vm_test = function () {
+                 return hex('abc').toLowerCase() === '900150983cd24fb0d6963f7d28e17f72';
+               };
+               /**
+                * Enable/disable uppercase hexadecimal returned string
+                * @param {boolean}
+                * @return {Object} this
+                * @public
+                */
 
-         issueComments.issue = function(val) {
-           if (!arguments.length) return _qaItem;
-           _qaItem = val;
-           return issueComments;
-         };
 
-         return issueComments;
-       }
+               this.setUpperCase = function (a) {
+                 if (typeof a === 'boolean') {
+                   hexcase = a;
+                 }
 
-       function uiImproveOsmDetails(context) {
-         let _qaItem;
+                 return this;
+               };
+               /**
+                * @description Defines a base64 pad string
+                * @param {string} Pad
+                * @return {Object} this
+                * @public
+                */
 
 
-         function issueDetail(d) {
-           if (d.desc) return d.desc;
-           const issueKey = d.issueKey;
-           d.replacements = d.replacements || {};
-           d.replacements.default = _t('inspector.unknown');  // special key `default` works as a fallback string
-           return _t(`QA.improveOSM.error_types.${issueKey}.description`, d.replacements);
-         }
+               this.setPad = function (a) {
+                 b64pad = a || b64pad;
+                 return this;
+               };
+               /**
+                * Defines a base64 pad string
+                * @param {boolean}
+                * @return {Object} this
+                * @public
+                */
 
 
-         function improveOsmDetails(selection) {
-           const details = selection.selectAll('.error-details')
-             .data(
-               (_qaItem ? [_qaItem] : []),
-               d => `${d.id}-${d.status || 0}`
-             );
+               this.setUTF8 = function (a) {
+                 if (typeof a === 'boolean') {
+                   utf8 = a;
+                 }
 
-           details.exit()
-             .remove();
-
-           const detailsEnter = details.enter()
-             .append('div')
-               .attr('class', 'error-details qa-details-container');
-
-
-           // description
-           const descriptionEnter = detailsEnter
-             .append('div')
-               .attr('class', 'qa-details-subsection');
-
-           descriptionEnter
-             .append('h4')
-               .text(() => _t('QA.keepRight.detail_description'));
-
-           descriptionEnter
-             .append('div')
-               .attr('class', 'qa-details-description-text')
-               .html(issueDetail);
-
-           // If there are entity links in the error message..
-           let relatedEntities = [];
-           descriptionEnter.selectAll('.error_entity_link, .error_object_link')
-             .each(function() {
-               const link = select(this);
-               const isObjectLink = link.classed('error_object_link');
-               const entityID = isObjectLink ?
-                 (utilEntityRoot(_qaItem.objectType) + _qaItem.objectId)
-                 : this.textContent;
-               const entity = context.hasEntity(entityID);
-
-               relatedEntities.push(entityID);
-
-               // Add click handler
-               link
-                 .on('mouseenter', () => {
-                   utilHighlightEntities([entityID], true, context);
-                 })
-                 .on('mouseleave', () => {
-                   utilHighlightEntities([entityID], false, context);
-                 })
-                 .on('click', () => {
-                   event.preventDefault();
+                 return this;
+               }; // private methods
 
-                   utilHighlightEntities([entityID], false, context);
+               /**
+                * Calculate the SHA-512 of a raw string
+                */
 
-                   const osmlayer = context.layers().layer('osm');
-                   if (!osmlayer.enabled()) {
-                     osmlayer.enabled(true);
-                   }
 
-                   context.map().centerZoom(_qaItem.loc, 20);
+               function rstr(s, utf8) {
+                 s = utf8 ? utf8Encode(s) : s;
+                 return binb2rstr(binb(rstr2binb(s), s.length * 8));
+               }
+               /**
+                * Calculate the HMAC-sha256 of a key and some data (raw strings)
+                */
 
-                   if (entity) {
-                     context.enter(modeSelect(context, [entityID]));
-                   } else {
-                     context.loadEntity(entityID, () => {
-                       context.enter(modeSelect(context, [entityID]));
-                     });
-                   }
-                 });
 
-               // Replace with friendly name if possible
-               // (The entity may not yet be loaded into the graph)
-               if (entity) {
-                 let name = utilDisplayName(entity);  // try to use common name
+               function rstr_hmac(key, data) {
+                 key = utf8 ? utf8Encode(key) : key;
+                 data = utf8 ? utf8Encode(data) : data;
+                 var hash,
+                     i = 0,
+                     bkey = rstr2binb(key),
+                     ipad = Array(16),
+                     opad = Array(16);
 
-                 if (!name && !isObjectLink) {
-                   const preset = _mainPresetIndex.match(entity, context.graph());
-                   name = preset && !preset.isFallback() && preset.name();  // fallback to preset name
+                 if (bkey.length > 16) {
+                   bkey = binb(bkey, key.length * 8);
                  }
 
-                 if (name) {
-                   this.innerText = name;
+                 for (; i < 16; i += 1) {
+                   ipad[i] = bkey[i] ^ 0x36363636;
+                   opad[i] = bkey[i] ^ 0x5C5C5C5C;
                  }
-               }
-             });
 
-           // Don't hide entities related to this error - #5880
-           context.features().forceVisible(relatedEntities);
-           context.map().pan([0,0]);  // trigger a redraw
-         }
+                 hash = binb(ipad.concat(rstr2binb(data)), 512 + data.length * 8);
+                 return binb2rstr(binb(opad.concat(hash), 512 + 256));
+               }
+               /*
+                * Main sha256 function, with its support functions
+                */
 
-         improveOsmDetails.issue = function(val) {
-           if (!arguments.length) return _qaItem;
-           _qaItem = val;
-           return improveOsmDetails;
-         };
 
-         return improveOsmDetails;
-       }
+               function sha256_S(X, n) {
+                 return X >>> n | X << 32 - n;
+               }
 
-       function uiImproveOsmHeader() {
-         let _qaItem;
+               function sha256_R(X, n) {
+                 return X >>> n;
+               }
 
+               function sha256_Ch(x, y, z) {
+                 return x & y ^ ~x & z;
+               }
 
-         function issueTitle(d) {
-           const issueKey = d.issueKey;
-           d.replacements = d.replacements || {};
-           d.replacements.default = _t('inspector.unknown');  // special key `default` works as a fallback string
-           return _t(`QA.improveOSM.error_types.${issueKey}.title`, d.replacements);
-         }
+               function sha256_Maj(x, y, z) {
+                 return x & y ^ x & z ^ y & z;
+               }
 
+               function sha256_Sigma0256(x) {
+                 return sha256_S(x, 2) ^ sha256_S(x, 13) ^ sha256_S(x, 22);
+               }
 
-         function improveOsmHeader(selection) {
-           const header = selection.selectAll('.qa-header')
-             .data(
-               (_qaItem ? [_qaItem] : []),
-               d => `${d.id}-${d.status || 0}`
-             );
+               function sha256_Sigma1256(x) {
+                 return sha256_S(x, 6) ^ sha256_S(x, 11) ^ sha256_S(x, 25);
+               }
 
-           header.exit()
-             .remove();
-
-           const headerEnter = header.enter()
-             .append('div')
-               .attr('class', 'qa-header');
-
-           const svgEnter = headerEnter
-             .append('div')
-               .attr('class', 'qa-header-icon')
-               .classed('new', d => d.id < 0)
-             .append('svg')
-               .attr('width', '20px')
-               .attr('height', '30px')
-               .attr('viewbox', '0 0 20 30')
-               .attr('class', d => `preset-icon-28 qaItem ${d.service} itemId-${d.id} itemType-${d.itemType}`);
-
-           svgEnter
-             .append('polygon')
-               .attr('fill', 'currentColor')
-               .attr('class', 'qaItem-fill')
-               .attr('points', '16,3 4,3 1,6 1,17 4,20 7,20 10,27 13,20 16,20 19,17.033 19,6');
-
-           svgEnter
-             .append('use')
-               .attr('class', 'icon-annotation')
-               .attr('width', '13px')
-               .attr('height', '13px')
-               .attr('transform', 'translate(3.5, 5)')
-               .attr('xlink:href', d => {
-                 const picon = d.icon;
-                 if (!picon) {
-                   return '';
-                 } else {
-                   const isMaki = /^maki-/.test(picon);
-                   return `#${picon}${isMaki ? '-11' : ''}`;
-                 }
-               });
+               function sha256_Gamma0256(x) {
+                 return sha256_S(x, 7) ^ sha256_S(x, 18) ^ sha256_R(x, 3);
+               }
 
-           headerEnter
-             .append('div')
-               .attr('class', 'qa-header-label')
-               .text(issueTitle);
-         }
+               function sha256_Gamma1256(x) {
+                 return sha256_S(x, 17) ^ sha256_S(x, 19) ^ sha256_R(x, 10);
+               }
 
-         improveOsmHeader.issue = function(val) {
-           if (!arguments.length) return _qaItem;
-           _qaItem = val;
-           return improveOsmHeader;
-         };
+               sha256_K = [1116352408, 1899447441, -1245643825, -373957723, 961987163, 1508970993, -1841331548, -1424204075, -670586216, 310598401, 607225278, 1426881987, 1925078388, -2132889090, -1680079193, -1046744716, -459576895, -272742522, 264347078, 604807628, 770255983, 1249150122, 1555081692, 1996064986, -1740746414, -1473132947, -1341970488, -1084653625, -958395405, -710438585, 113926993, 338241895, 666307205, 773529912, 1294757372, 1396182291, 1695183700, 1986661051, -2117940946, -1838011259, -1564481375, -1474664885, -1035236496, -949202525, -778901479, -694614492, -200395387, 275423344, 430227734, 506948616, 659060556, 883997877, 958139571, 1322822218, 1537002063, 1747873779, 1955562222, 2024104815, -2067236844, -1933114872, -1866530822, -1538233109, -1090935817, -965641998];
 
-         return improveOsmHeader;
-       }
+               function binb(m, l) {
+                 var HASH = [1779033703, -1150833019, 1013904242, -1521486534, 1359893119, -1694144372, 528734635, 1541459225];
+                 var W = new Array(64);
+                 var a, b, c, d, e, f, g, h;
+                 var i, j, T1, T2;
+                 /* append padding */
 
-       function uiImproveOsmEditor(context) {
-         const dispatch$1 = dispatch('change');
-         const qaDetails = uiImproveOsmDetails(context);
-         const qaComments = uiImproveOsmComments();
-         const qaHeader = uiImproveOsmHeader();
+                 m[l >> 5] |= 0x80 << 24 - l % 32;
+                 m[(l + 64 >> 9 << 4) + 15] = l;
 
-         let _qaItem;
+                 for (i = 0; i < m.length; i += 16) {
+                   a = HASH[0];
+                   b = HASH[1];
+                   c = HASH[2];
+                   d = HASH[3];
+                   e = HASH[4];
+                   f = HASH[5];
+                   g = HASH[6];
+                   h = HASH[7];
 
-         function improveOsmEditor(selection) {
+                   for (j = 0; j < 64; j += 1) {
+                     if (j < 16) {
+                       W[j] = m[j + i];
+                     } else {
+                       W[j] = safe_add(safe_add(safe_add(sha256_Gamma1256(W[j - 2]), W[j - 7]), sha256_Gamma0256(W[j - 15])), W[j - 16]);
+                     }
 
-           const headerEnter = selection.selectAll('.header')
-             .data([0])
-             .enter()
-             .append('div')
-               .attr('class', 'header fillL');
+                     T1 = safe_add(safe_add(safe_add(safe_add(h, sha256_Sigma1256(e)), sha256_Ch(e, f, g)), sha256_K[j]), W[j]);
+                     T2 = safe_add(sha256_Sigma0256(a), sha256_Maj(a, b, c));
+                     h = g;
+                     g = f;
+                     f = e;
+                     e = safe_add(d, T1);
+                     d = c;
+                     c = b;
+                     b = a;
+                     a = safe_add(T1, T2);
+                   }
+
+                   HASH[0] = safe_add(a, HASH[0]);
+                   HASH[1] = safe_add(b, HASH[1]);
+                   HASH[2] = safe_add(c, HASH[2]);
+                   HASH[3] = safe_add(d, HASH[3]);
+                   HASH[4] = safe_add(e, HASH[4]);
+                   HASH[5] = safe_add(f, HASH[5]);
+                   HASH[6] = safe_add(g, HASH[6]);
+                   HASH[7] = safe_add(h, HASH[7]);
+                 }
 
-           headerEnter
-             .append('button')
-               .attr('class', 'close')
-               .on('click', () => context.enter(modeBrowse(context)))
-               .call(svgIcon('#iD-icon-close'));
+                 return HASH;
+               }
+             },
 
-           headerEnter
-             .append('h3')
-               .text(_t('QA.improveOSM.title'));
+             /**
+              * @class Hashes.SHA512
+              * @param {config}
+              *
+              * A JavaScript implementation of the Secure Hash Algorithm, SHA-512, as defined in FIPS 180-2
+              * Version 2.2 Copyright Anonymous Contributor, Paul Johnston 2000 - 2009.
+              * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
+              * See http://pajhome.org.uk/crypt/md5 for details.
+              */
+             SHA512: function SHA512(options) {
+               /**
+                * Private properties configuration variables. You may need to tweak these to be compatible with
+                * the server-side, but the defaults work in most cases.
+                * @see this.setUpperCase() method
+                * @see this.setPad() method
+                */
+               var hexcase = options && typeof options.uppercase === 'boolean' ? options.uppercase : false,
 
-           let body = selection.selectAll('.body')
-             .data([0]);
+               /* hexadecimal output case format. false - lowercase; true - uppercase  */
+               b64pad = options && typeof options.pad === 'string' ? options.pad : '=',
 
-           body = body.enter()
-             .append('div')
-               .attr('class', 'body')
-             .merge(body);
+               /* base-64 pad character. Default '=' for strict RFC compliance   */
+               utf8 = options && typeof options.utf8 === 'boolean' ? options.utf8 : true,
 
-           const editor = body.selectAll('.qa-editor')
-             .data([0]);
+               /* enable/disable utf8 encoding */
+               sha512_k;
+               /* privileged (public) methods */
 
-           editor.enter()
-             .append('div')
-               .attr('class', 'modal-section qa-editor')
-             .merge(editor)
-               .call(qaHeader.issue(_qaItem))
-               .call(qaDetails.issue(_qaItem))
-               .call(qaComments.issue(_qaItem))
-               .call(improveOsmSaveSection);
-         }
+               this.hex = function (s) {
+                 return rstr2hex(rstr(s));
+               };
 
-         function improveOsmSaveSection(selection) {
-           const isSelected = (_qaItem && _qaItem.id === context.selectedErrorID());
-           const isShown = (_qaItem && (isSelected || _qaItem.newComment || _qaItem.comment));
-           let saveSection = selection.selectAll('.qa-save')
-             .data(
-               (isShown ? [_qaItem] : []),
-               d => `${d.id}-${d.status || 0}`
-             );
+               this.b64 = function (s) {
+                 return rstr2b64(rstr(s), b64pad);
+               };
 
-           // exit
-           saveSection.exit()
-             .remove();
+               this.any = function (s, e) {
+                 return rstr2any(rstr(s), e);
+               };
 
-           // enter
-           const saveSectionEnter = saveSection.enter()
-             .append('div')
-               .attr('class', 'qa-save save-section cf');
-
-           saveSectionEnter
-             .append('h4')
-               .attr('class', '.qa-save-header')
-               .text(_t('note.newComment'));
-
-           saveSectionEnter
-             .append('textarea')
-               .attr('class', 'new-comment-input')
-               .attr('placeholder', _t('QA.keepRight.comment_placeholder'))
-               .attr('maxlength', 1000)
-               .property('value', d => d.newComment)
-               .call(utilNoAuto)
-               .on('input', changeInput)
-               .on('blur', changeInput);
+               this.raw = function (s) {
+                 return rstr(s);
+               };
 
-           // update
-           saveSection = saveSectionEnter
-             .merge(saveSection)
-               .call(qaSaveButtons);
+               this.hex_hmac = function (k, d) {
+                 return rstr2hex(rstr_hmac(k, d));
+               };
 
-           function changeInput() {
-             const input = select(this);
-             let val = input.property('value').trim();
+               this.b64_hmac = function (k, d) {
+                 return rstr2b64(rstr_hmac(k, d), b64pad);
+               };
 
-             if (val === '') {
-               val = undefined;
-             }
+               this.any_hmac = function (k, d, e) {
+                 return rstr2any(rstr_hmac(k, d), e);
+               };
+               /**
+                * Perform a simple self-test to see if the VM is working
+                * @return {String} Hexadecimal hash sample
+                * @public
+                */
 
-             // store the unsaved comment with the issue itself
-             _qaItem = _qaItem.update({ newComment: val });
 
-             const qaService = services.improveOSM;
-             if (qaService) {
-               qaService.replaceItem(_qaItem);
-             }
+               this.vm_test = function () {
+                 return hex('abc').toLowerCase() === '900150983cd24fb0d6963f7d28e17f72';
+               };
+               /**
+                * @description Enable/disable uppercase hexadecimal returned string
+                * @param {boolean}
+                * @return {Object} this
+                * @public
+                */
 
-             saveSection
-               .call(qaSaveButtons);
-           }
-         }
 
-         function qaSaveButtons(selection) {
-           const isSelected = (_qaItem && _qaItem.id === context.selectedErrorID());
-           let buttonSection = selection.selectAll('.buttons')
-             .data((isSelected ? [_qaItem] : []), d => d.status + d.id);
+               this.setUpperCase = function (a) {
+                 if (typeof a === 'boolean') {
+                   hexcase = a;
+                 }
 
-           // exit
-           buttonSection.exit()
-             .remove();
+                 return this;
+               };
+               /**
+                * @description Defines a base64 pad string
+                * @param {string} Pad
+                * @return {Object} this
+                * @public
+                */
 
-           // enter
-           const buttonEnter = buttonSection.enter()
-             .append('div')
-               .attr('class', 'buttons');
 
-           buttonEnter
-             .append('button')
-               .attr('class', 'button comment-button action')
-               .text(_t('QA.keepRight.save_comment'));
+               this.setPad = function (a) {
+                 b64pad = a || b64pad;
+                 return this;
+               };
+               /**
+                * @description Defines a base64 pad string
+                * @param {boolean}
+                * @return {Object} this
+                * @public
+                */
 
-           buttonEnter
-             .append('button')
-               .attr('class', 'button close-button action');
 
-           buttonEnter
-             .append('button')
-               .attr('class', 'button ignore-button action');
+               this.setUTF8 = function (a) {
+                 if (typeof a === 'boolean') {
+                   utf8 = a;
+                 }
 
-           // update
-           buttonSection = buttonSection
-             .merge(buttonEnter);
+                 return this;
+               };
+               /* private methods */
 
-           buttonSection.select('.comment-button')
-             .attr('disabled', d => d.newComment ? null : true)
-             .on('click.comment', function(d) {
-               this.blur();    // avoid keeping focus on the button - #4641
-               const qaService = services.improveOSM;
-               if (qaService) {
-                 qaService.postUpdate(d, (err, item) => dispatch$1.call('change', item));
-               }
-             });
+               /**
+                * Calculate the SHA-512 of a raw string
+                */
 
-           buttonSection.select('.close-button')
-             .text(d => {
-               const andComment = (d.newComment ? '_comment' : '');
-               return _t(`QA.keepRight.close${andComment}`);
-             })
-             .on('click.close', function(d) {
-               this.blur();    // avoid keeping focus on the button - #4641
-               const qaService = services.improveOSM;
-               if (qaService) {
-                 d.newStatus = 'SOLVED';
-                 qaService.postUpdate(d, (err, item) => dispatch$1.call('change', item));
-               }
-             });
 
-           buttonSection.select('.ignore-button')
-             .text(d => {
-               const andComment = (d.newComment ? '_comment' : '');
-               return _t(`QA.keepRight.ignore${andComment}`);
-             })
-             .on('click.ignore', function(d) {
-               this.blur();    // avoid keeping focus on the button - #4641
-               const qaService = services.improveOSM;
-               if (qaService) {
-                 d.newStatus = 'INVALID';
-                 qaService.postUpdate(d, (err, item) => dispatch$1.call('change', item));
+               function rstr(s) {
+                 s = utf8 ? utf8Encode(s) : s;
+                 return binb2rstr(binb(rstr2binb(s), s.length * 8));
                }
-             });
-         }
-
-         // NOTE: Don't change method name until UI v3 is merged
-         improveOsmEditor.error = function(val) {
-           if (!arguments.length) return _qaItem;
-           _qaItem = val;
-           return improveOsmEditor;
-         };
+               /*
+                * Calculate the HMAC-SHA-512 of a key and some data (raw strings)
+                */
 
-         return utilRebind(improveOsmEditor, dispatch$1, 'on');
-       }
 
-       function uiKeepRightDetails(context) {
-         let _qaItem;
+               function rstr_hmac(key, data) {
+                 key = utf8 ? utf8Encode(key) : key;
+                 data = utf8 ? utf8Encode(data) : data;
+                 var hash,
+                     i = 0,
+                     bkey = rstr2binb(key),
+                     ipad = Array(32),
+                     opad = Array(32);
 
+                 if (bkey.length > 32) {
+                   bkey = binb(bkey, key.length * 8);
+                 }
 
-         function issueDetail(d) {
-           const { itemType, parentIssueType } = d;
-           const unknown = _t('inspector.unknown');
-           let replacements = d.replacements || {};
-           replacements.default = unknown;  // special key `default` works as a fallback string
+                 for (; i < 32; i += 1) {
+                   ipad[i] = bkey[i] ^ 0x36363636;
+                   opad[i] = bkey[i] ^ 0x5C5C5C5C;
+                 }
 
-           let detail = _t(`QA.keepRight.errorTypes.${itemType}.description`, replacements);
-           if (detail === unknown) {
-             detail = _t(`QA.keepRight.errorTypes.${parentIssueType}.description`, replacements);
-           }
-           return detail;
-         }
+                 hash = binb(ipad.concat(rstr2binb(data)), 1024 + data.length * 8);
+                 return binb2rstr(binb(opad.concat(hash), 1024 + 512));
+               }
+               /**
+                * Calculate the SHA-512 of an array of big-endian dwords, and a bit length
+                */
+
+
+               function binb(x, len) {
+                 var j,
+                     i,
+                     l,
+                     W = new Array(80),
+                     hash = new Array(16),
+                     //Initial hash values
+                 H = [new int64(0x6a09e667, -205731576), new int64(-1150833019, -2067093701), new int64(0x3c6ef372, -23791573), new int64(-1521486534, 0x5f1d36f1), new int64(0x510e527f, -1377402159), new int64(-1694144372, 0x2b3e6c1f), new int64(0x1f83d9ab, -79577749), new int64(0x5be0cd19, 0x137e2179)],
+                     T1 = new int64(0, 0),
+                     T2 = new int64(0, 0),
+                     a = new int64(0, 0),
+                     b = new int64(0, 0),
+                     c = new int64(0, 0),
+                     d = new int64(0, 0),
+                     e = new int64(0, 0),
+                     f = new int64(0, 0),
+                     g = new int64(0, 0),
+                     h = new int64(0, 0),
+                     //Temporary variables not specified by the document
+                 s0 = new int64(0, 0),
+                     s1 = new int64(0, 0),
+                     Ch = new int64(0, 0),
+                     Maj = new int64(0, 0),
+                     r1 = new int64(0, 0),
+                     r2 = new int64(0, 0),
+                     r3 = new int64(0, 0);
+
+                 if (sha512_k === undefined) {
+                   //SHA512 constants
+                   sha512_k = [new int64(0x428a2f98, -685199838), new int64(0x71374491, 0x23ef65cd), new int64(-1245643825, -330482897), new int64(-373957723, -2121671748), new int64(0x3956c25b, -213338824), new int64(0x59f111f1, -1241133031), new int64(-1841331548, -1357295717), new int64(-1424204075, -630357736), new int64(-670586216, -1560083902), new int64(0x12835b01, 0x45706fbe), new int64(0x243185be, 0x4ee4b28c), new int64(0x550c7dc3, -704662302), new int64(0x72be5d74, -226784913), new int64(-2132889090, 0x3b1696b1), new int64(-1680079193, 0x25c71235), new int64(-1046744716, -815192428), new int64(-459576895, -1628353838), new int64(-272742522, 0x384f25e3), new int64(0xfc19dc6, -1953704523), new int64(0x240ca1cc, 0x77ac9c65), new int64(0x2de92c6f, 0x592b0275), new int64(0x4a7484aa, 0x6ea6e483), new int64(0x5cb0a9dc, -1119749164), new int64(0x76f988da, -2096016459), new int64(-1740746414, -295247957), new int64(-1473132947, 0x2db43210), new int64(-1341970488, -1728372417), new int64(-1084653625, -1091629340), new int64(-958395405, 0x3da88fc2), new int64(-710438585, -1828018395), new int64(0x6ca6351, -536640913), new int64(0x14292967, 0xa0e6e70), new int64(0x27b70a85, 0x46d22ffc), new int64(0x2e1b2138, 0x5c26c926), new int64(0x4d2c6dfc, 0x5ac42aed), new int64(0x53380d13, -1651133473), new int64(0x650a7354, -1951439906), new int64(0x766a0abb, 0x3c77b2a8), new int64(-2117940946, 0x47edaee6), new int64(-1838011259, 0x1482353b), new int64(-1564481375, 0x4cf10364), new int64(-1474664885, -1136513023), new int64(-1035236496, -789014639), new int64(-949202525, 0x654be30), new int64(-778901479, -688958952), new int64(-694614492, 0x5565a910), new int64(-200395387, 0x5771202a), new int64(0x106aa070, 0x32bbd1b8), new int64(0x19a4c116, -1194143544), new int64(0x1e376c08, 0x5141ab53), new int64(0x2748774c, -544281703), new int64(0x34b0bcb5, -509917016), new int64(0x391c0cb3, -976659869), new int64(0x4ed8aa4a, -482243893), new int64(0x5b9cca4f, 0x7763e373), new int64(0x682e6ff3, -692930397), new int64(0x748f82ee, 0x5defb2fc), new int64(0x78a5636f, 0x43172f60), new int64(-2067236844, -1578062990), new int64(-1933114872, 0x1a6439ec), new int64(-1866530822, 0x23631e28), new int64(-1538233109, -561857047), new int64(-1090935817, -1295615723), new int64(-965641998, -479046869), new int64(-903397682, -366583396), new int64(-779700025, 0x21c0c207), new int64(-354779690, -840897762), new int64(-176337025, -294727304), new int64(0x6f067aa, 0x72176fba), new int64(0xa637dc5, -1563912026), new int64(0x113f9804, -1090974290), new int64(0x1b710b35, 0x131c471b), new int64(0x28db77f5, 0x23047d84), new int64(0x32caab7b, 0x40c72493), new int64(0x3c9ebe0a, 0x15c9bebc), new int64(0x431d67c4, -1676669620), new int64(0x4cc5d4be, -885112138), new int64(0x597f299c, -60457430), new int64(0x5fcb6fab, 0x3ad6faec), new int64(0x6c44198c, 0x4a475817)];
+                 }
 
+                 for (i = 0; i < 80; i += 1) {
+                   W[i] = new int64(0, 0);
+                 } // append padding to the source string. The format is described in the FIPS.
+
+
+                 x[len >> 5] |= 0x80 << 24 - (len & 0x1f);
+                 x[(len + 128 >> 10 << 5) + 31] = len;
+                 l = x.length;
+
+                 for (i = 0; i < l; i += 32) {
+                   //32 dwords is the block size
+                   int64copy(a, H[0]);
+                   int64copy(b, H[1]);
+                   int64copy(c, H[2]);
+                   int64copy(d, H[3]);
+                   int64copy(e, H[4]);
+                   int64copy(f, H[5]);
+                   int64copy(g, H[6]);
+                   int64copy(h, H[7]);
+
+                   for (j = 0; j < 16; j += 1) {
+                     W[j].h = x[i + 2 * j];
+                     W[j].l = x[i + 2 * j + 1];
+                   }
+
+                   for (j = 16; j < 80; j += 1) {
+                     //sigma1
+                     int64rrot(r1, W[j - 2], 19);
+                     int64revrrot(r2, W[j - 2], 29);
+                     int64shr(r3, W[j - 2], 6);
+                     s1.l = r1.l ^ r2.l ^ r3.l;
+                     s1.h = r1.h ^ r2.h ^ r3.h; //sigma0
+
+                     int64rrot(r1, W[j - 15], 1);
+                     int64rrot(r2, W[j - 15], 8);
+                     int64shr(r3, W[j - 15], 7);
+                     s0.l = r1.l ^ r2.l ^ r3.l;
+                     s0.h = r1.h ^ r2.h ^ r3.h;
+                     int64add4(W[j], s1, W[j - 7], s0, W[j - 16]);
+                   }
+
+                   for (j = 0; j < 80; j += 1) {
+                     //Ch
+                     Ch.l = e.l & f.l ^ ~e.l & g.l;
+                     Ch.h = e.h & f.h ^ ~e.h & g.h; //Sigma1
+
+                     int64rrot(r1, e, 14);
+                     int64rrot(r2, e, 18);
+                     int64revrrot(r3, e, 9);
+                     s1.l = r1.l ^ r2.l ^ r3.l;
+                     s1.h = r1.h ^ r2.h ^ r3.h; //Sigma0
+
+                     int64rrot(r1, a, 28);
+                     int64revrrot(r2, a, 2);
+                     int64revrrot(r3, a, 7);
+                     s0.l = r1.l ^ r2.l ^ r3.l;
+                     s0.h = r1.h ^ r2.h ^ r3.h; //Maj
+
+                     Maj.l = a.l & b.l ^ a.l & c.l ^ b.l & c.l;
+                     Maj.h = a.h & b.h ^ a.h & c.h ^ b.h & c.h;
+                     int64add5(T1, h, s1, Ch, sha512_k[j], W[j]);
+                     int64add(T2, s0, Maj);
+                     int64copy(h, g);
+                     int64copy(g, f);
+                     int64copy(f, e);
+                     int64add(e, d, T1);
+                     int64copy(d, c);
+                     int64copy(c, b);
+                     int64copy(b, a);
+                     int64add(a, T1, T2);
+                   }
+
+                   int64add(H[0], H[0], a);
+                   int64add(H[1], H[1], b);
+                   int64add(H[2], H[2], c);
+                   int64add(H[3], H[3], d);
+                   int64add(H[4], H[4], e);
+                   int64add(H[5], H[5], f);
+                   int64add(H[6], H[6], g);
+                   int64add(H[7], H[7], h);
+                 } //represent the hash as an array of 32-bit dwords
+
+
+                 for (i = 0; i < 8; i += 1) {
+                   hash[2 * i] = H[i].h;
+                   hash[2 * i + 1] = H[i].l;
+                 }
 
-         function keepRightDetails(selection) {
-           const details = selection.selectAll('.error-details')
-             .data(
-               (_qaItem ? [_qaItem] : []),
-               d => `${d.id}-${d.status || 0}`
-             );
+                 return hash;
+               } //A constructor for 64-bit numbers
 
-           details.exit()
-             .remove();
-
-           const detailsEnter = details.enter()
-             .append('div')
-               .attr('class', 'error-details qa-details-container');
-
-           // description
-           const descriptionEnter = detailsEnter
-             .append('div')
-               .attr('class', 'qa-details-subsection');
-
-           descriptionEnter
-             .append('h4')
-               .text(() => _t('QA.keepRight.detail_description'));
-
-           descriptionEnter
-             .append('div')
-               .attr('class', 'qa-details-description-text')
-               .html(issueDetail);
-
-           // If there are entity links in the error message..
-           let relatedEntities = [];
-           descriptionEnter.selectAll('.error_entity_link, .error_object_link')
-             .each(function() {
-               const link = select(this);
-               const isObjectLink = link.classed('error_object_link');
-               const entityID = isObjectLink ?
-                 (utilEntityRoot(_qaItem.objectType) + _qaItem.objectId)
-                 : this.textContent;
-               const entity = context.hasEntity(entityID);
-
-               relatedEntities.push(entityID);
-
-               // Add click handler
-               link
-                 .on('mouseenter', () => {
-                   utilHighlightEntities([entityID], true, context);
-                 })
-                 .on('mouseleave', () => {
-                   utilHighlightEntities([entityID], false, context);
-                 })
-                 .on('click', () => {
-                   event.preventDefault();
 
-                   utilHighlightEntities([entityID], false, context);
+               function int64(h, l) {
+                 this.h = h;
+                 this.l = l; //this.toString = int64toString;
+               } //Copies src into dst, assuming both are 64-bit numbers
 
-                   const osmlayer = context.layers().layer('osm');
-                   if (!osmlayer.enabled()) {
-                     osmlayer.enabled(true);
-                   }
 
-                   context.map().centerZoomEase(_qaItem.loc, 20);
+               function int64copy(dst, src) {
+                 dst.h = src.h;
+                 dst.l = src.l;
+               } //Right-rotates a 64-bit number by shift
+               //Won't handle cases of shift>=32
+               //The function revrrot() is for that
 
-                   if (entity) {
-                     context.enter(modeSelect(context, [entityID]));
-                   } else {
-                     context.loadEntity(entityID, () => {
-                       context.enter(modeSelect(context, [entityID]));
-                     });
-                   }
-                 });
 
-               // Replace with friendly name if possible
-               // (The entity may not yet be loaded into the graph)
-               if (entity) {
-                 let name = utilDisplayName(entity);  // try to use common name
+               function int64rrot(dst, x, shift) {
+                 dst.l = x.l >>> shift | x.h << 32 - shift;
+                 dst.h = x.h >>> shift | x.l << 32 - shift;
+               } //Reverses the dwords of the source and then rotates right by shift.
+               //This is equivalent to rotation by 32+shift
 
-                 if (!name && !isObjectLink) {
-                   const preset = _mainPresetIndex.match(entity, context.graph());
-                   name = preset && !preset.isFallback() && preset.name();  // fallback to preset name
-                 }
 
-                 if (name) {
-                   this.innerText = name;
-                 }
-               }
-             });
+               function int64revrrot(dst, x, shift) {
+                 dst.l = x.h >>> shift | x.l << 32 - shift;
+                 dst.h = x.l >>> shift | x.h << 32 - shift;
+               } //Bitwise-shifts right a 64-bit number by shift
+               //Won't handle shift>=32, but it's never needed in SHA512
 
-           // Don't hide entities related to this issue - #5880
-           context.features().forceVisible(relatedEntities);
-           context.map().pan([0,0]);  // trigger a redraw
-         }
 
-         keepRightDetails.issue = function(val) {
-           if (!arguments.length) return _qaItem;
-           _qaItem = val;
-           return keepRightDetails;
-         };
+               function int64shr(dst, x, shift) {
+                 dst.l = x.l >>> shift | x.h << 32 - shift;
+                 dst.h = x.h >>> shift;
+               } //Adds two 64-bit numbers
+               //Like the original implementation, does not rely on 32-bit operations
 
-         return keepRightDetails;
-       }
 
-       function uiKeepRightHeader() {
-         let _qaItem;
+               function int64add(dst, x, y) {
+                 var w0 = (x.l & 0xffff) + (y.l & 0xffff);
+                 var w1 = (x.l >>> 16) + (y.l >>> 16) + (w0 >>> 16);
+                 var w2 = (x.h & 0xffff) + (y.h & 0xffff) + (w1 >>> 16);
+                 var w3 = (x.h >>> 16) + (y.h >>> 16) + (w2 >>> 16);
+                 dst.l = w0 & 0xffff | w1 << 16;
+                 dst.h = w2 & 0xffff | w3 << 16;
+               } //Same, except with 4 addends. Works faster than adding them one by one.
 
 
-         function issueTitle(d) {
-           const { itemType, parentIssueType } = d;
-           const unknown = _t('inspector.unknown');
-           let replacements = d.replacements || {};
-           replacements.default = unknown;  // special key `default` works as a fallback string
+               function int64add4(dst, a, b, c, d) {
+                 var w0 = (a.l & 0xffff) + (b.l & 0xffff) + (c.l & 0xffff) + (d.l & 0xffff);
+                 var w1 = (a.l >>> 16) + (b.l >>> 16) + (c.l >>> 16) + (d.l >>> 16) + (w0 >>> 16);
+                 var w2 = (a.h & 0xffff) + (b.h & 0xffff) + (c.h & 0xffff) + (d.h & 0xffff) + (w1 >>> 16);
+                 var w3 = (a.h >>> 16) + (b.h >>> 16) + (c.h >>> 16) + (d.h >>> 16) + (w2 >>> 16);
+                 dst.l = w0 & 0xffff | w1 << 16;
+                 dst.h = w2 & 0xffff | w3 << 16;
+               } //Same, except with 5 addends
 
-           let title = _t(`QA.keepRight.errorTypes.${itemType}.title`, replacements);
-           if (title === unknown) {
-             title = _t(`QA.keepRight.errorTypes.${parentIssueType}.title`, replacements);
-           }
-           return title;
-         }
 
+               function int64add5(dst, a, b, c, d, e) {
+                 var w0 = (a.l & 0xffff) + (b.l & 0xffff) + (c.l & 0xffff) + (d.l & 0xffff) + (e.l & 0xffff),
+                     w1 = (a.l >>> 16) + (b.l >>> 16) + (c.l >>> 16) + (d.l >>> 16) + (e.l >>> 16) + (w0 >>> 16),
+                     w2 = (a.h & 0xffff) + (b.h & 0xffff) + (c.h & 0xffff) + (d.h & 0xffff) + (e.h & 0xffff) + (w1 >>> 16),
+                     w3 = (a.h >>> 16) + (b.h >>> 16) + (c.h >>> 16) + (d.h >>> 16) + (e.h >>> 16) + (w2 >>> 16);
+                 dst.l = w0 & 0xffff | w1 << 16;
+                 dst.h = w2 & 0xffff | w3 << 16;
+               }
+             },
 
-         function keepRightHeader(selection) {
-           const header = selection.selectAll('.qa-header')
-             .data(
-               (_qaItem ? [_qaItem] : []),
-               d => `${d.id}-${d.status || 0}`
-             );
+             /**
+              * @class Hashes.RMD160
+              * @constructor
+              * @param {Object} [config]
+              *
+              * A JavaScript implementation of the RIPEMD-160 Algorithm
+              * Version 2.2 Copyright Jeremy Lin, Paul Johnston 2000 - 2009.
+              * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
+              * See http://pajhome.org.uk/crypt/md5 for details.
+              * Also http://www.ocf.berkeley.edu/~jjlin/jsotp/
+              */
+             RMD160: function RMD160(options) {
+               /**
+                * Private properties configuration variables. You may need to tweak these to be compatible with
+                * the server-side, but the defaults work in most cases.
+                * @see this.setUpperCase() method
+                * @see this.setPad() method
+                */
+               var hexcase = options && typeof options.uppercase === 'boolean' ? options.uppercase : false,
 
-           header.exit()
-             .remove();
+               /* hexadecimal output case format. false - lowercase; true - uppercase  */
+               b64pad = options && typeof options.pad === 'string' ? options.pa : '=',
 
-           const headerEnter = header.enter()
-             .append('div')
-               .attr('class', 'qa-header');
+               /* base-64 pad character. Default '=' for strict RFC compliance   */
+               utf8 = options && typeof options.utf8 === 'boolean' ? options.utf8 : true,
 
-           const iconEnter = headerEnter
-             .append('div')
-               .attr('class', 'qa-header-icon')
-               .classed('new', d => d.id < 0);
+               /* enable/disable utf8 encoding */
+               rmd160_r1 = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 7, 4, 13, 1, 10, 6, 15, 3, 12, 0, 9, 5, 2, 14, 11, 8, 3, 10, 14, 4, 9, 15, 8, 1, 2, 7, 0, 6, 13, 11, 5, 12, 1, 9, 11, 10, 0, 8, 12, 4, 13, 3, 7, 15, 14, 5, 6, 2, 4, 0, 5, 9, 7, 12, 2, 10, 14, 1, 3, 8, 11, 6, 15, 13],
+                   rmd160_r2 = [5, 14, 7, 0, 9, 2, 11, 4, 13, 6, 15, 8, 1, 10, 3, 12, 6, 11, 3, 7, 0, 13, 5, 10, 14, 15, 8, 12, 4, 9, 1, 2, 15, 5, 1, 3, 7, 14, 6, 9, 11, 8, 12, 2, 10, 0, 4, 13, 8, 6, 4, 1, 3, 11, 15, 0, 5, 12, 2, 13, 9, 7, 10, 14, 12, 15, 10, 4, 1, 5, 8, 7, 6, 2, 13, 14, 0, 3, 9, 11],
+                   rmd160_s1 = [11, 14, 15, 12, 5, 8, 7, 9, 11, 13, 14, 15, 6, 7, 9, 8, 7, 6, 8, 13, 11, 9, 7, 15, 7, 12, 15, 9, 11, 7, 13, 12, 11, 13, 6, 7, 14, 9, 13, 15, 14, 8, 13, 6, 5, 12, 7, 5, 11, 12, 14, 15, 14, 15, 9, 8, 9, 14, 5, 6, 8, 6, 5, 12, 9, 15, 5, 11, 6, 8, 13, 12, 5, 12, 13, 14, 11, 8, 5, 6],
+                   rmd160_s2 = [8, 9, 9, 11, 13, 15, 15, 5, 7, 7, 8, 11, 14, 14, 12, 6, 9, 13, 15, 7, 12, 8, 9, 11, 7, 7, 12, 7, 6, 15, 13, 11, 9, 7, 15, 11, 8, 6, 6, 14, 12, 13, 5, 14, 13, 13, 7, 5, 15, 5, 8, 11, 14, 14, 6, 14, 6, 9, 12, 9, 12, 5, 15, 8, 8, 5, 12, 9, 12, 5, 14, 6, 8, 13, 6, 5, 15, 13, 11, 11];
+               /* privileged (public) methods */
+
+               this.hex = function (s) {
+                 return rstr2hex(rstr(s));
+               };
 
-           iconEnter
-             .append('div')
-               .attr('class', d => `preset-icon-28 qaItem ${d.service} itemId-${d.id} itemType-${d.parentIssueType}`)
-               .call(svgIcon('#iD-icon-bolt', 'qaItem-fill'));
+               this.b64 = function (s) {
+                 return rstr2b64(rstr(s), b64pad);
+               };
 
-           headerEnter
-             .append('div')
-               .attr('class', 'qa-header-label')
-               .text(issueTitle);
-         }
+               this.any = function (s, e) {
+                 return rstr2any(rstr(s), e);
+               };
 
+               this.raw = function (s) {
+                 return rstr(s);
+               };
 
-         keepRightHeader.issue = function(val) {
-           if (!arguments.length) return _qaItem;
-           _qaItem = val;
-           return keepRightHeader;
-         };
+               this.hex_hmac = function (k, d) {
+                 return rstr2hex(rstr_hmac(k, d));
+               };
 
-         return keepRightHeader;
-       }
+               this.b64_hmac = function (k, d) {
+                 return rstr2b64(rstr_hmac(k, d), b64pad);
+               };
 
-       function uiViewOnKeepRight() {
-         let _qaItem;
+               this.any_hmac = function (k, d, e) {
+                 return rstr2any(rstr_hmac(k, d), e);
+               };
+               /**
+                * Perform a simple self-test to see if the VM is working
+                * @return {String} Hexadecimal hash sample
+                * @public
+                */
 
-         function viewOnKeepRight(selection) {
-           let url;
-           if (services.keepRight && (_qaItem instanceof QAItem)) {
-             url = services.keepRight.issueURL(_qaItem);
-           }
 
-           const link = selection.selectAll('.view-on-keepRight')
-             .data(url ? [url] : []);
+               this.vm_test = function () {
+                 return hex('abc').toLowerCase() === '900150983cd24fb0d6963f7d28e17f72';
+               };
+               /**
+                * @description Enable/disable uppercase hexadecimal returned string
+                * @param {boolean}
+                * @return {Object} this
+                * @public
+                */
 
-           // exit
-           link.exit()
-             .remove();
 
-           // enter
-           const linkEnter = link.enter()
-             .append('a')
-               .attr('class', 'view-on-keepRight')
-               .attr('target', '_blank')
-               .attr('rel', 'noopener') // security measure
-               .attr('href', d => d)
-               .call(svgIcon('#iD-icon-out-link', 'inline'));
+               this.setUpperCase = function (a) {
+                 if (typeof a === 'boolean') {
+                   hexcase = a;
+                 }
 
-           linkEnter
-             .append('span')
-               .text(_t('inspector.view_on_keepRight'));
-         }
+                 return this;
+               };
+               /**
+                * @description Defines a base64 pad string
+                * @param {string} Pad
+                * @return {Object} this
+                * @public
+                */
 
-         viewOnKeepRight.what = function(val) {
-           if (!arguments.length) return _qaItem;
-           _qaItem = val;
-           return viewOnKeepRight;
-         };
 
-         return viewOnKeepRight;
-       }
+               this.setPad = function (a) {
+                 if (typeof a !== 'undefined') {
+                   b64pad = a;
+                 }
 
-       function uiKeepRightEditor(context) {
-         const dispatch$1 = dispatch('change');
-         const qaDetails = uiKeepRightDetails(context);
-         const qaHeader = uiKeepRightHeader();
+                 return this;
+               };
+               /**
+                * @description Defines a base64 pad string
+                * @param {boolean}
+                * @return {Object} this
+                * @public
+                */
 
-         let _qaItem;
 
-         function keepRightEditor(selection) {
+               this.setUTF8 = function (a) {
+                 if (typeof a === 'boolean') {
+                   utf8 = a;
+                 }
 
-           const headerEnter = selection.selectAll('.header')
-             .data([0])
-             .enter()
-             .append('div')
-               .attr('class', 'header fillL');
+                 return this;
+               };
+               /* private methods */
 
-           headerEnter
-             .append('button')
-               .attr('class', 'close')
-               .on('click', () => context.enter(modeBrowse(context)))
-               .call(svgIcon('#iD-icon-close'));
+               /**
+                * Calculate the rmd160 of a raw string
+                */
 
-           headerEnter
-             .append('h3')
-               .text(_t('QA.keepRight.title'));
 
+               function rstr(s) {
+                 s = utf8 ? utf8Encode(s) : s;
+                 return binl2rstr(binl(rstr2binl(s), s.length * 8));
+               }
+               /**
+                * Calculate the HMAC-rmd160 of a key and some data (raw strings)
+                */
 
-           let body = selection.selectAll('.body')
-             .data([0]);
 
-           body = body.enter()
-             .append('div')
-               .attr('class', 'body')
-             .merge(body);
+               function rstr_hmac(key, data) {
+                 key = utf8 ? utf8Encode(key) : key;
+                 data = utf8 ? utf8Encode(data) : data;
+                 var i,
+                     hash,
+                     bkey = rstr2binl(key),
+                     ipad = Array(16),
+                     opad = Array(16);
 
-           const editor = body.selectAll('.qa-editor')
-             .data([0]);
+                 if (bkey.length > 16) {
+                   bkey = binl(bkey, key.length * 8);
+                 }
 
-           editor.enter()
-             .append('div')
-               .attr('class', 'modal-section qa-editor')
-             .merge(editor)
-               .call(qaHeader.issue(_qaItem))
-               .call(qaDetails.issue(_qaItem))
-               .call(keepRightSaveSection);
+                 for (i = 0; i < 16; i += 1) {
+                   ipad[i] = bkey[i] ^ 0x36363636;
+                   opad[i] = bkey[i] ^ 0x5C5C5C5C;
+                 }
 
+                 hash = binl(ipad.concat(rstr2binl(data)), 512 + data.length * 8);
+                 return binl2rstr(binl(opad.concat(hash), 512 + 160));
+               }
+               /**
+                * Convert an array of little-endian words to a string
+                */
 
-           const footer = selection.selectAll('.footer')
-             .data([0]);
 
-           footer.enter()
-             .append('div')
-             .attr('class', 'footer')
-             .merge(footer)
-             .call(uiViewOnKeepRight().what(_qaItem));
-         }
+               function binl2rstr(input) {
+                 var i,
+                     output = '',
+                     l = input.length * 32;
 
+                 for (i = 0; i < l; i += 8) {
+                   output += String.fromCharCode(input[i >> 5] >>> i % 32 & 0xFF);
+                 }
 
-         function keepRightSaveSection(selection) {
-           const isSelected = (_qaItem && _qaItem.id === context.selectedErrorID());
-           const isShown = (_qaItem && (isSelected || _qaItem.newComment || _qaItem.comment));
-           let saveSection = selection.selectAll('.qa-save')
-             .data(
-               (isShown ? [_qaItem] : []),
-               d => `${d.id}-${d.status || 0}`
-             );
+                 return output;
+               }
+               /**
+                * Calculate the RIPE-MD160 of an array of little-endian words, and a bit length.
+                */
+
+
+               function binl(x, len) {
+                 var T,
+                     j,
+                     i,
+                     l,
+                     h0 = 0x67452301,
+                     h1 = 0xefcdab89,
+                     h2 = 0x98badcfe,
+                     h3 = 0x10325476,
+                     h4 = 0xc3d2e1f0,
+                     A1,
+                     B1,
+                     C1,
+                     D1,
+                     E1,
+                     A2,
+                     B2,
+                     C2,
+                     D2,
+                     E2;
+                 /* append padding */
+
+                 x[len >> 5] |= 0x80 << len % 32;
+                 x[(len + 64 >>> 9 << 4) + 14] = len;
+                 l = x.length;
+
+                 for (i = 0; i < l; i += 16) {
+                   A1 = A2 = h0;
+                   B1 = B2 = h1;
+                   C1 = C2 = h2;
+                   D1 = D2 = h3;
+                   E1 = E2 = h4;
+
+                   for (j = 0; j <= 79; j += 1) {
+                     T = safe_add(A1, rmd160_f(j, B1, C1, D1));
+                     T = safe_add(T, x[i + rmd160_r1[j]]);
+                     T = safe_add(T, rmd160_K1(j));
+                     T = safe_add(bit_rol(T, rmd160_s1[j]), E1);
+                     A1 = E1;
+                     E1 = D1;
+                     D1 = bit_rol(C1, 10);
+                     C1 = B1;
+                     B1 = T;
+                     T = safe_add(A2, rmd160_f(79 - j, B2, C2, D2));
+                     T = safe_add(T, x[i + rmd160_r2[j]]);
+                     T = safe_add(T, rmd160_K2(j));
+                     T = safe_add(bit_rol(T, rmd160_s2[j]), E2);
+                     A2 = E2;
+                     E2 = D2;
+                     D2 = bit_rol(C2, 10);
+                     C2 = B2;
+                     B2 = T;
+                   }
+
+                   T = safe_add(h1, safe_add(C1, D2));
+                   h1 = safe_add(h2, safe_add(D1, E2));
+                   h2 = safe_add(h3, safe_add(E1, A2));
+                   h3 = safe_add(h4, safe_add(A1, B2));
+                   h4 = safe_add(h0, safe_add(B1, C2));
+                   h0 = T;
+                 }
 
-           // exit
-           saveSection.exit()
-             .remove();
+                 return [h0, h1, h2, h3, h4];
+               } // specific algorithm methods
 
-           // enter
-           const saveSectionEnter = saveSection.enter()
-             .append('div')
-               .attr('class', 'qa-save save-section cf');
-
-           saveSectionEnter
-             .append('h4')
-               .attr('class', '.qa-save-header')
-               .text(_t('QA.keepRight.comment'));
-
-           saveSectionEnter
-             .append('textarea')
-               .attr('class', 'new-comment-input')
-               .attr('placeholder', _t('QA.keepRight.comment_placeholder'))
-               .attr('maxlength', 1000)
-               .property('value', d => d.newComment || d.comment)
-               .call(utilNoAuto)
-               .on('input', changeInput)
-               .on('blur', changeInput);
 
-           // update
-           saveSection = saveSectionEnter
-             .merge(saveSection)
-               .call(qaSaveButtons);
+               function rmd160_f(j, x, y, z) {
+                 return 0 <= j && j <= 15 ? x ^ y ^ z : 16 <= j && j <= 31 ? x & y | ~x & z : 32 <= j && j <= 47 ? (x | ~y) ^ z : 48 <= j && j <= 63 ? x & z | y & ~z : 64 <= j && j <= 79 ? x ^ (y | ~z) : 'rmd160_f: j out of range';
+               }
 
-           function changeInput() {
-             const input = select(this);
-             let val = input.property('value').trim();
+               function rmd160_K1(j) {
+                 return 0 <= j && j <= 15 ? 0x00000000 : 16 <= j && j <= 31 ? 0x5a827999 : 32 <= j && j <= 47 ? 0x6ed9eba1 : 48 <= j && j <= 63 ? 0x8f1bbcdc : 64 <= j && j <= 79 ? 0xa953fd4e : 'rmd160_K1: j out of range';
+               }
 
-             if (val === _qaItem.comment) {
-               val = undefined;
+               function rmd160_K2(j) {
+                 return 0 <= j && j <= 15 ? 0x50a28be6 : 16 <= j && j <= 31 ? 0x5c4dd124 : 32 <= j && j <= 47 ? 0x6d703ef3 : 48 <= j && j <= 63 ? 0x7a6d76e9 : 64 <= j && j <= 79 ? 0x00000000 : 'rmd160_K2: j out of range';
+               }
              }
+           }; // exposes Hashes
 
-             // store the unsaved comment with the issue itself
-             _qaItem = _qaItem.update({ newComment: val });
+           (function (window, undefined$1) {
+             var freeExports = false;
 
-             const qaService = services.keepRight;
-             if (qaService) {
-               qaService.replaceItem(_qaItem);  // update keepright cache
+             {
+               freeExports = exports;
+
+               if (exports && _typeof(commonjsGlobal) === 'object' && commonjsGlobal && commonjsGlobal === commonjsGlobal.global) {
+                 window = commonjsGlobal;
+               }
              }
 
-             saveSection
-               .call(qaSaveButtons);
-           }
-         }
+             if (typeof undefined$1 === 'function' && _typeof(undefined$1.amd) === 'object' && undefined$1.amd) {
+               // define as an anonymous module, so, through path mapping, it can be aliased
+               undefined$1(function () {
+                 return Hashes;
+               });
+             } else if (freeExports) {
+               // in Node.js or RingoJS v0.8.0+
+               if ( module && module.exports === freeExports) {
+                 module.exports = Hashes;
+               } // in Narwhal or RingoJS v0.7.0-
+               else {
+                   freeExports.Hashes = Hashes;
+                 }
+             } else {
+               // in a browser or Rhino
+               window.Hashes = Hashes;
+             }
+           })(this);
+         })(); // IIFE
 
+       });
 
-         function qaSaveButtons(selection) {
-           const isSelected = (_qaItem && _qaItem.id === context.selectedErrorID());
-           let buttonSection = selection.selectAll('.buttons')
-             .data((isSelected ? [_qaItem] : []), d => d.status + d.id);
+       var immutable = extend$2;
+       var hasOwnProperty$2 = Object.prototype.hasOwnProperty;
 
-           // exit
-           buttonSection.exit()
-             .remove();
+       function extend$2() {
+         var target = {};
 
-           // enter
-           const buttonEnter = buttonSection.enter()
-             .append('div')
-               .attr('class', 'buttons');
+         for (var i = 0; i < arguments.length; i++) {
+           var source = arguments[i];
 
-           buttonEnter
-             .append('button')
-               .attr('class', 'button comment-button action')
-               .text(_t('QA.keepRight.save_comment'));
+           for (var key in source) {
+             if (hasOwnProperty$2.call(source, key)) {
+               target[key] = source[key];
+             }
+           }
+         }
 
-           buttonEnter
-             .append('button')
-               .attr('class', 'button close-button action');
+         return target;
+       }
 
-           buttonEnter
-             .append('button')
-               .attr('class', 'button ignore-button action');
+       var sha1 = new hashes.SHA1();
+       var ohauth = {};
 
-           // update
-           buttonSection = buttonSection
-             .merge(buttonEnter);
+       ohauth.qsString = function (obj) {
+         return Object.keys(obj).sort().map(function (key) {
+           return ohauth.percentEncode(key) + '=' + ohauth.percentEncode(obj[key]);
+         }).join('&');
+       };
 
-           buttonSection.select('.comment-button')   // select and propagate data
-             .attr('disabled', d => d.newComment ? null : true)
-             .on('click.comment', function(d) {
-               this.blur();    // avoid keeping focus on the button - #4641
-               const qaService = services.keepRight;
-               if (qaService) {
-                 qaService.postUpdate(d, (err, item) => dispatch$1.call('change', item));
-               }
-             });
+       ohauth.stringQs = function (str) {
+         return str.split('&').filter(function (pair) {
+           return pair !== '';
+         }).reduce(function (obj, pair) {
+           var parts = pair.split('=');
+           obj[decodeURIComponent(parts[0])] = null === parts[1] ? '' : decodeURIComponent(parts[1]);
+           return obj;
+         }, {});
+       };
 
-           buttonSection.select('.close-button')   // select and propagate data
-             .text(d => {
-               const andComment = (d.newComment ? '_comment' : '');
-               return _t(`QA.keepRight.close${andComment}`);
-             })
-             .on('click.close', function(d) {
-               this.blur();    // avoid keeping focus on the button - #4641
-               const qaService = services.keepRight;
-               if (qaService) {
-                 d.newStatus = 'ignore_t';   // ignore temporarily (item fixed)
-                 qaService.postUpdate(d, (err, item) => dispatch$1.call('change', item));
-               }
-             });
+       ohauth.rawxhr = function (method, url, data, headers, callback) {
+         var xhr = new XMLHttpRequest(),
+             twoHundred = /^20\d$/;
 
-           buttonSection.select('.ignore-button')   // select and propagate data
-             .text(d => {
-               const andComment = (d.newComment ? '_comment' : '');
-               return _t(`QA.keepRight.ignore${andComment}`);
-             })
-             .on('click.ignore', function(d) {
-               this.blur();    // avoid keeping focus on the button - #4641
-               const qaService = services.keepRight;
-               if (qaService) {
-                 d.newStatus = 'ignore';   // ignore permanently (false positive)
-                 qaService.postUpdate(d, (err, item) => dispatch$1.call('change', item));
-               }
-             });
-         }
+         xhr.onreadystatechange = function () {
+           if (4 === xhr.readyState && 0 !== xhr.status) {
+             if (twoHundred.test(xhr.status)) callback(null, xhr);else return callback(xhr, null);
+           }
+         };
 
-         // NOTE: Don't change method name until UI v3 is merged
-         keepRightEditor.error = function(val) {
-           if (!arguments.length) return _qaItem;
-           _qaItem = val;
-           return keepRightEditor;
+         xhr.onerror = function (e) {
+           return callback(e, null);
          };
 
-         return utilRebind(keepRightEditor, dispatch$1, 'on');
-       }
+         xhr.open(method, url, true);
 
-       function uiOsmoseDetails(context) {
-         let _qaItem;
+         for (var h in headers) {
+           xhr.setRequestHeader(h, headers[h]);
+         }
 
-         function issueString(d, type) {
-           if (!d) return '';
+         xhr.send(data);
+         return xhr;
+       };
+
+       ohauth.xhr = function (method, url, auth, data, options, callback) {
+         var headers = options && options.header || {
+           'Content-Type': 'application/x-www-form-urlencoded'
+         };
+         headers.Authorization = 'OAuth ' + ohauth.authHeader(auth);
+         return ohauth.rawxhr(method, url, data, headers, callback);
+       };
 
-           // Issue strings are cached from Osmose API
-           const s = services.osmose.getStrings(d.itemType);
-           return (type in s) ? s[type] : '';
+       ohauth.nonce = function () {
+         for (var o = ''; o.length < 6;) {
+           o += '0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz'[Math.floor(Math.random() * 61)];
          }
 
+         return o;
+       };
 
-         function osmoseDetails(selection) {
-           const details = selection.selectAll('.error-details')
-             .data(
-               _qaItem ? [_qaItem] : [],
-               d => `${d.id}-${d.status || 0}`
-             );
+       ohauth.authHeader = function (obj) {
+         return Object.keys(obj).sort().map(function (key) {
+           return encodeURIComponent(key) + '="' + encodeURIComponent(obj[key]) + '"';
+         }).join(', ');
+       };
 
-           details.exit()
-             .remove();
+       ohauth.timestamp = function () {
+         return ~~(+new Date() / 1000);
+       };
 
-           const detailsEnter = details.enter()
-             .append('div')
-               .attr('class', 'error-details qa-details-container');
+       ohauth.percentEncode = function (s) {
+         return encodeURIComponent(s).replace(/\!/g, '%21').replace(/\'/g, '%27').replace(/\*/g, '%2A').replace(/\(/g, '%28').replace(/\)/g, '%29');
+       };
 
+       ohauth.baseString = function (method, url, params) {
+         if (params.oauth_signature) delete params.oauth_signature;
+         return [method, ohauth.percentEncode(url), ohauth.percentEncode(ohauth.qsString(params))].join('&');
+       };
+
+       ohauth.signature = function (oauth_secret, token_secret, baseString) {
+         return sha1.b64_hmac(ohauth.percentEncode(oauth_secret) + '&' + ohauth.percentEncode(token_secret), baseString);
+       };
+       /**
+        * Takes an options object for configuration (consumer_key,
+        * consumer_secret, version, signature_method, token, token_secret)
+        * and returns a function that generates the Authorization header
+        * for given data.
+        *
+        * The returned function takes these parameters:
+        * - method: GET/POST/...
+        * - uri: full URI with protocol, port, path and query string
+        * - extra_params: any extra parameters (that are passed in the POST data),
+        *   can be an object or a from-urlencoded string.
+        *
+        * Returned function returns full OAuth header with "OAuth" string in it.
+        */
 
-           // Description
-           if (issueString(_qaItem, 'detail')) {
-             const div = detailsEnter
-               .append('div')
-                 .attr('class', 'qa-details-subsection');
 
-             div
-               .append('h4')
-                 .text(() => _t('QA.keepRight.detail_description'));
+       ohauth.headerGenerator = function (options) {
+         options = options || {};
+         var consumer_key = options.consumer_key || '',
+             consumer_secret = options.consumer_secret || '',
+             signature_method = options.signature_method || 'HMAC-SHA1',
+             version = options.version || '1.0',
+             token = options.token || '',
+             token_secret = options.token_secret || '';
+         return function (method, uri, extra_params) {
+           method = method.toUpperCase();
 
-             div
-               .append('p')
-                 .attr('class', 'qa-details-description-text')
-                 .html(d => issueString(d, 'detail'))
-               .selectAll('a')
-                 .attr('rel', 'noopener')
-                 .attr('target', '_blank');
+           if (typeof extra_params === 'string' && extra_params.length > 0) {
+             extra_params = ohauth.stringQs(extra_params);
            }
 
-           // Elements (populated later as data is requested)
-           const detailsDiv = detailsEnter
-             .append('div')
-               .attr('class', 'qa-details-subsection');
+           var uri_parts = uri.split('?', 2),
+               base_uri = uri_parts[0];
+           var query_params = uri_parts.length === 2 ? ohauth.stringQs(uri_parts[1]) : {};
+           var oauth_params = {
+             oauth_consumer_key: consumer_key,
+             oauth_signature_method: signature_method,
+             oauth_version: version,
+             oauth_timestamp: ohauth.timestamp(),
+             oauth_nonce: ohauth.nonce()
+           };
+           if (token) oauth_params.oauth_token = token;
+           var all_params = immutable({}, oauth_params, query_params, extra_params),
+               base_str = ohauth.baseString(method, base_uri, all_params);
+           oauth_params.oauth_signature = ohauth.signature(consumer_secret, token_secret, base_str);
+           return 'OAuth ' + ohauth.authHeader(oauth_params);
+         };
+       };
 
-           const elemsDiv = detailsEnter
-             .append('div')
-               .attr('class', 'qa-details-subsection');
+       var ohauth_1 = ohauth;
 
-           // Suggested Fix (musn't exist for every issue type)
-           if (issueString(_qaItem, 'fix')) {
-             const div = detailsEnter
-               .append('div')
-                 .attr('class', 'qa-details-subsection');
+       var resolveUrl$1 = createCommonjsModule(function (module, exports) {
+         // Copyright 2014 Simon Lydell
+         // X11 (“MIT”) Licensed. (See LICENSE.)
+         void function (root, factory) {
+           {
+             module.exports = factory();
+           }
+         }(commonjsGlobal, function () {
+           function resolveUrl()
+           /* ...urls */
+           {
+             var numUrls = arguments.length;
 
-             div
-               .append('h4')
-                 .text(() => _t('QA.osmose.fix_title'));
+             if (numUrls === 0) {
+               throw new Error("resolveUrl requires at least one argument; got none.");
+             }
 
-             div
-               .append('p')
-                 .html(d => issueString(d, 'fix'))
-               .selectAll('a')
-                 .attr('rel', 'noopener')
-                 .attr('target', '_blank');
-           }
+             var base = document.createElement("base");
+             base.href = arguments[0];
 
-           // Common Pitfalls (musn't exist for every issue type)
-           if (issueString(_qaItem, 'trap')) {
-             const div = detailsEnter
-               .append('div')
-                 .attr('class', 'qa-details-subsection');
-
-             div
-               .append('h4')
-                 .text(() => _t('QA.osmose.trap_title'));
-
-             div
-               .append('p')
-                 .html(d => issueString(d, 'trap'))
-               .selectAll('a')
-                 .attr('rel', 'noopener')
-                 .attr('target', '_blank');
-           }
-
-           // Save current item to check if UI changed by time request resolves
-           const thisItem = _qaItem;
-           services.osmose.loadIssueDetail(_qaItem)
-             .then(d => {
-               // No details to add if there are no associated issue elements
-               if (!d.elems || d.elems.length === 0) return;
-
-               // Do nothing if UI has moved on by the time this resolves
-               if (
-                 context.selectedErrorID() !== thisItem.id
-                 && context.container().selectAll(`.qaItem.osmose.hover.itemId-${thisItem.id}`).empty()
-               ) return;
-
-               // Things like keys and values are dynamically added to a subtitle string
-               if (d.detail) {
-                 detailsDiv
-                   .append('h4')
-                     .text(() => _t('QA.osmose.detail_title'));
-
-                 detailsDiv
-                   .append('p')
-                     .html(d => d.detail)
-                   .selectAll('a')
-                     .attr('rel', 'noopener')
-                     .attr('target', '_blank');
-               }
-
-               // Create list of linked issue elements
-               elemsDiv
-                 .append('h4')
-                   .text(() => _t('QA.osmose.elems_title'));
-
-               elemsDiv
-                 .append('ul').selectAll('li')
-                 .data(d.elems)
-                 .enter()
-                 .append('li')
-                 .append('a')
-                   .attr('class', 'error_entity_link')
-                   .text(d => d)
-                   .each(function() {
-                     const link = select(this);
-                     const entityID = this.textContent;
-                     const entity = context.hasEntity(entityID);
-
-                     // Add click handler
-                     link
-                       .on('mouseenter', () => {
-                         utilHighlightEntities([entityID], true, context);
-                       })
-                       .on('mouseleave', () => {
-                         utilHighlightEntities([entityID], false, context);
-                       })
-                       .on('click', () => {
-                         event.preventDefault();
+             if (numUrls === 1) {
+               return base.href;
+             }
 
-                         utilHighlightEntities([entityID], false, context);
+             var head = document.getElementsByTagName("head")[0];
+             head.insertBefore(base, head.firstChild);
+             var a = document.createElement("a");
+             var resolved;
 
-                         const osmlayer = context.layers().layer('osm');
-                         if (!osmlayer.enabled()) {
-                           osmlayer.enabled(true);
-                         }
+             for (var index = 1; index < numUrls; index++) {
+               a.href = arguments[index];
+               resolved = a.href;
+               base.href = resolved;
+             }
 
-                         context.map().centerZoom(d.loc, 20);
+             head.removeChild(base);
+             return resolved;
+           }
 
-                         if (entity) {
-                           context.enter(modeSelect(context, [entityID]));
-                         } else {
-                           context.loadEntity(entityID, () => {
-                             context.enter(modeSelect(context, [entityID]));
-                           });
-                         }
-                       });
+           return resolveUrl;
+         });
+       });
 
-                     // Replace with friendly name if possible
-                     // (The entity may not yet be loaded into the graph)
-                     if (entity) {
-                       let name = utilDisplayName(entity);  // try to use common name
+       var assign = make_assign();
+       var create$1 = make_create();
+       var trim$3 = make_trim();
+       var Global = typeof window !== 'undefined' ? window : commonjsGlobal;
+       var util = {
+         assign: assign,
+         create: create$1,
+         trim: trim$3,
+         bind: bind$1,
+         slice: slice$2,
+         each: each,
+         map: map$1,
+         pluck: pluck,
+         isList: isList,
+         isFunction: isFunction,
+         isObject: isObject$2,
+         Global: Global
+       };
 
-                       if (!name) {
-                         const preset = _mainPresetIndex.match(entity, context.graph());
-                         name = preset && !preset.isFallback() && preset.name();  // fallback to preset name
-                       }
+       function make_assign() {
+         if (Object.assign) {
+           return Object.assign;
+         } else {
+           return function shimAssign(obj, props1, props2, etc) {
+             for (var i = 1; i < arguments.length; i++) {
+               each(Object(arguments[i]), function (val, key) {
+                 obj[key] = val;
+               });
+             }
 
-                       if (name) {
-                         this.innerText = name;
-                       }
-                     }
-                   });
+             return obj;
+           };
+         }
+       }
 
-               // Don't hide entities related to this issue - #5880
-               context.features().forceVisible(d.elems);
-               context.map().pan([0,0]);  // trigger a redraw
-             })
-             .catch(err => {
-               console.log(err); // eslint-disable-line no-console
-             });
+       function make_create() {
+         if (Object.create) {
+           return function create(obj, assignProps1, assignProps2, etc) {
+             var assignArgsList = slice$2(arguments, 1);
+             return assign.apply(this, [Object.create(obj)].concat(assignArgsList));
+           };
+         } else {
+           var F = function F() {}; // eslint-disable-line no-inner-declarations
+
+
+           return function create(obj, assignProps1, assignProps2, etc) {
+             var assignArgsList = slice$2(arguments, 1);
+             F.prototype = obj;
+             return assign.apply(this, [new F()].concat(assignArgsList));
+           };
          }
+       }
 
+       function make_trim() {
+         if (String.prototype.trim) {
+           return function trim(str) {
+             return String.prototype.trim.call(str);
+           };
+         } else {
+           return function trim(str) {
+             return str.replace(/^[\s\uFEFF\xA0]+|[\s\uFEFF\xA0]+$/g, '');
+           };
+         }
+       }
 
-         osmoseDetails.issue = function(val) {
-           if (!arguments.length) return _qaItem;
-           _qaItem = val;
-           return osmoseDetails;
+       function bind$1(obj, fn) {
+         return function () {
+           return fn.apply(obj, Array.prototype.slice.call(arguments, 0));
          };
+       }
 
+       function slice$2(arr, index) {
+         return Array.prototype.slice.call(arr, index || 0);
+       }
 
-         return osmoseDetails;
+       function each(obj, fn) {
+         pluck(obj, function (val, key) {
+           fn(val, key);
+           return false;
+         });
        }
 
-       function uiOsmoseHeader() {
-         let _qaItem;
+       function map$1(obj, fn) {
+         var res = isList(obj) ? [] : {};
+         pluck(obj, function (v, k) {
+           res[k] = fn(v, k);
+           return false;
+         });
+         return res;
+       }
 
-         function issueTitle(d) {
-           const unknown = _t('inspector.unknown');
+       function pluck(obj, fn) {
+         if (isList(obj)) {
+           for (var i = 0; i < obj.length; i++) {
+             if (fn(obj[i], i)) {
+               return obj[i];
+             }
+           }
+         } else {
+           for (var key in obj) {
+             if (obj.hasOwnProperty(key)) {
+               if (fn(obj[key], key)) {
+                 return obj[key];
+               }
+             }
+           }
+         }
+       }
 
-           if (!d) return unknown;
+       function isList(val) {
+         return val != null && typeof val != 'function' && typeof val.length == 'number';
+       }
 
-           // Issue titles supplied by Osmose
-           const s = services.osmose.getStrings(d.itemType);
-           return ('title' in s) ? s.title : unknown;
-         }
+       function isFunction(val) {
+         return val && {}.toString.call(val) === '[object Function]';
+       }
 
-         function osmoseHeader(selection) {
-           const header = selection.selectAll('.qa-header')
-             .data(
-               (_qaItem ? [_qaItem] : []),
-               d => `${d.id}-${d.status || 0}`
-             );
+       function isObject$2(val) {
+         return val && {}.toString.call(val) === '[object Object]';
+       }
 
-           header.exit()
-             .remove();
-
-           const headerEnter = header.enter()
-             .append('div')
-               .attr('class', 'qa-header');
-
-           const svgEnter = headerEnter
-             .append('div')
-               .attr('class', 'qa-header-icon')
-               .classed('new', d => d.id < 0)
-             .append('svg')
-               .attr('width', '20px')
-               .attr('height', '30px')
-               .attr('viewbox', '0 0 20 30')
-               .attr('class', d => `preset-icon-28 qaItem ${d.service} itemId-${d.id} itemType-${d.itemType}`);
-
-           svgEnter
-             .append('polygon')
-               .attr('fill', d => services.osmose.getColor(d.item))
-               .attr('class', 'qaItem-fill')
-               .attr('points', '16,3 4,3 1,6 1,17 4,20 7,20 10,27 13,20 16,20 19,17.033 19,6');
-
-           svgEnter
-             .append('use')
-               .attr('class', 'icon-annotation')
-               .attr('width', '13px')
-               .attr('height', '13px')
-               .attr('transform', 'translate(3.5, 5)')
-               .attr('xlink:href', d => {
-                 const picon = d.icon;
-
-                 if (!picon) {
-                   return '';
-                 } else {
-                   const isMaki = /^maki-/.test(picon);
-                   return `#${picon}${isMaki ? '-11' : ''}`;
-                 }
-               });
+       var slice$3 = util.slice;
+       var pluck$1 = util.pluck;
+       var each$1 = util.each;
+       var bind$2 = util.bind;
+       var create$2 = util.create;
+       var isList$1 = util.isList;
+       var isFunction$1 = util.isFunction;
+       var isObject$3 = util.isObject;
+       var storeEngine = {
+         createStore: _createStore
+       };
+       var storeAPI = {
+         version: '2.0.12',
+         enabled: false,
+         // get returns the value of the given key. If that value
+         // is undefined, it returns optionalDefaultValue instead.
+         get: function get(key, optionalDefaultValue) {
+           var data = this.storage.read(this._namespacePrefix + key);
+           return this._deserialize(data, optionalDefaultValue);
+         },
+         // set will store the given value at key and returns value.
+         // Calling set with value === undefined is equivalent to calling remove.
+         set: function set(key, value) {
+           if (value === undefined) {
+             return this.remove(key);
+           }
 
-           headerEnter
-             .append('div')
-               .attr('class', 'qa-header-label')
-               .text(issueTitle);
+           this.storage.write(this._namespacePrefix + key, this._serialize(value));
+           return value;
+         },
+         // remove deletes the key and value stored at the given key.
+         remove: function remove(key) {
+           this.storage.remove(this._namespacePrefix + key);
+         },
+         // each will call the given callback once for each key-value pair
+         // in this store.
+         each: function each(callback) {
+           var self = this;
+           this.storage.each(function (val, namespacedKey) {
+             callback.call(self, self._deserialize(val), (namespacedKey || '').replace(self._namespaceRegexp, ''));
+           });
+         },
+         // clearAll will remove all the stored key-value pairs in this store.
+         clearAll: function clearAll() {
+           this.storage.clearAll();
+         },
+         // additional functionality that can't live in plugins
+         // ---------------------------------------------------
+         // hasNamespace returns true if this store instance has the given namespace.
+         hasNamespace: function hasNamespace(namespace) {
+           return this._namespacePrefix == '__storejs_' + namespace + '_';
+         },
+         // createStore creates a store.js instance with the first
+         // functioning storage in the list of storage candidates,
+         // and applies the the given mixins to the instance.
+         createStore: function createStore() {
+           return _createStore.apply(this, arguments);
+         },
+         addPlugin: function addPlugin(plugin) {
+           this._addPlugin(plugin);
+         },
+         namespace: function namespace(_namespace) {
+           return _createStore(this.storage, this.plugins, _namespace);
          }
+       };
 
-         osmoseHeader.issue = function(val) {
-           if (!arguments.length) return _qaItem;
-           _qaItem = val;
-           return osmoseHeader;
-         };
+       function _warn() {
+         var _console = typeof console == 'undefined' ? null : console;
 
-         return osmoseHeader;
-       }
+         if (!_console) {
+           return;
+         }
 
-       function uiViewOnOsmose() {
-         let _qaItem;
+         var fn = _console.warn ? _console.warn : _console.log;
+         fn.apply(_console, arguments);
+       }
 
-         function viewOnOsmose(selection) {
-           let url;
-           if (services.osmose && (_qaItem instanceof QAItem)) {
-             url = services.osmose.itemURL(_qaItem);
-           }
+       function _createStore(storages, plugins, namespace) {
+         if (!namespace) {
+           namespace = '';
+         }
 
-           const link = selection.selectAll('.view-on-osmose')
-             .data(url ? [url] : []);
+         if (storages && !isList$1(storages)) {
+           storages = [storages];
+         }
 
-           // exit
-           link.exit()
-             .remove();
+         if (plugins && !isList$1(plugins)) {
+           plugins = [plugins];
+         }
 
-           // enter
-           const linkEnter = link.enter()
-             .append('a')
-               .attr('class', 'view-on-osmose')
-               .attr('target', '_blank')
-               .attr('rel', 'noopener') // security measure
-               .attr('href', d => d)
-               .call(svgIcon('#iD-icon-out-link', 'inline'));
+         var namespacePrefix = namespace ? '__storejs_' + namespace + '_' : '';
+         var namespaceRegexp = namespace ? new RegExp('^' + namespacePrefix) : null;
+         var legalNamespaces = /^[a-zA-Z0-9_\-]*$/; // alpha-numeric + underscore and dash
 
-           linkEnter
-             .append('span')
-               .text(_t('inspector.view_on_osmose'));
+         if (!legalNamespaces.test(namespace)) {
+           throw new Error('store.js namespaces can only have alphanumerics + underscores and dashes');
          }
 
-         viewOnOsmose.what = function(val) {
-           if (!arguments.length) return _qaItem;
-           _qaItem = val;
-           return viewOnOsmose;
-         };
+         var _privateStoreProps = {
+           _namespacePrefix: namespacePrefix,
+           _namespaceRegexp: namespaceRegexp,
+           _testStorage: function _testStorage(storage) {
+             try {
+               var testStr = '__storejs__test__';
+               storage.write(testStr, testStr);
+               var ok = storage.read(testStr) === testStr;
+               storage.remove(testStr);
+               return ok;
+             } catch (e) {
+               return false;
+             }
+           },
+           _assignPluginFnProp: function _assignPluginFnProp(pluginFnProp, propName) {
+             var oldFn = this[propName];
 
-         return viewOnOsmose;
-       }
+             this[propName] = function pluginFn() {
+               var args = slice$3(arguments, 0);
+               var self = this; // super_fn calls the old function which was overwritten by
+               // this mixin.
 
-       function uiOsmoseEditor(context) {
-         const dispatch$1 = dispatch('change');
-         const qaDetails = uiOsmoseDetails(context);
-         const qaHeader = uiOsmoseHeader();
+               function super_fn() {
+                 if (!oldFn) {
+                   return;
+                 }
+
+                 each$1(arguments, function (arg, i) {
+                   args[i] = arg;
+                 });
+                 return oldFn.apply(self, args);
+               } // Give mixing function access to super_fn by prefixing all mixin function
+               // arguments with super_fn.
 
-         let _qaItem;
 
-         function osmoseEditor(selection) {
+               var newFnArgs = [super_fn].concat(args);
+               return pluginFnProp.apply(self, newFnArgs);
+             };
+           },
+           _serialize: function _serialize(obj) {
+             return JSON.stringify(obj);
+           },
+           _deserialize: function _deserialize(strVal, defaultVal) {
+             if (!strVal) {
+               return defaultVal;
+             } // It is possible that a raw string value has been previously stored
+             // in a storage without using store.js, meaning it will be a raw
+             // string value instead of a JSON serialized string. By defaulting
+             // to the raw string value in case of a JSON parse error, we allow
+             // for past stored values to be forwards-compatible with store.js
+
+
+             var val = '';
+
+             try {
+               val = JSON.parse(strVal);
+             } catch (e) {
+               val = strVal;
+             }
 
-           const header = selection.selectAll('.header')
-             .data([0]);
+             return val !== undefined ? val : defaultVal;
+           },
+           _addStorage: function _addStorage(storage) {
+             if (this.enabled) {
+               return;
+             }
 
-           const headerEnter = header.enter()
-             .append('div')
-               .attr('class', 'header fillL');
+             if (this._testStorage(storage)) {
+               this.storage = storage;
+               this.enabled = true;
+             }
+           },
+           _addPlugin: function _addPlugin(plugin) {
+             var self = this; // If the plugin is an array, then add all plugins in the array.
+             // This allows for a plugin to depend on other plugins.
 
-           headerEnter
-             .append('button')
-               .attr('class', 'close')
-               .on('click', () => context.enter(modeBrowse(context)))
-               .call(svgIcon('#iD-icon-close'));
+             if (isList$1(plugin)) {
+               each$1(plugin, function (plugin) {
+                 self._addPlugin(plugin);
+               });
+               return;
+             } // Keep track of all plugins we've seen so far, so that we
+             // don't add any of them twice.
 
-           headerEnter
-             .append('h3')
-               .text(_t('QA.osmose.title'));
 
-           let body = selection.selectAll('.body')
-             .data([0]);
+             var seenPlugin = pluck$1(this.plugins, function (seenPlugin) {
+               return plugin === seenPlugin;
+             });
 
-           body = body.enter()
-               .append('div')
-               .attr('class', 'body')
-             .merge(body);
+             if (seenPlugin) {
+               return;
+             }
 
-           let editor = body.selectAll('.qa-editor')
-             .data([0]);
+             this.plugins.push(plugin); // Check that the plugin is properly formed
 
-           editor.enter()
-             .append('div')
-               .attr('class', 'modal-section qa-editor')
-             .merge(editor)
-               .call(qaHeader.issue(_qaItem))
-               .call(qaDetails.issue(_qaItem))
-               .call(osmoseSaveSection);
+             if (!isFunction$1(plugin)) {
+               throw new Error('Plugins must be function values that return objects');
+             }
 
-           const footer = selection.selectAll('.footer')
-             .data([0]);
+             var pluginProperties = plugin.call(this);
 
-           footer.enter()
-             .append('div')
-             .attr('class', 'footer')
-             .merge(footer)
-             .call(uiViewOnOsmose().what(_qaItem));
-         }
+             if (!isObject$3(pluginProperties)) {
+               throw new Error('Plugins must return an object of function properties');
+             } // Add the plugin function properties to this store instance.
 
-         function osmoseSaveSection(selection) {
-           const isSelected = (_qaItem && _qaItem.id === context.selectedErrorID());
-           const isShown = (_qaItem && isSelected);
-           let saveSection = selection.selectAll('.qa-save')
-             .data(
-               (isShown ? [_qaItem] : []),
-               d => `${d.id}-${d.status || 0}`
-             );
 
-           // exit
-           saveSection.exit()
-             .remove();
+             each$1(pluginProperties, function (pluginFnProp, propName) {
+               if (!isFunction$1(pluginFnProp)) {
+                 throw new Error('Bad plugin property: ' + propName + ' from plugin ' + plugin.name + '. Plugins should only return functions.');
+               }
 
-           // enter
-           const saveSectionEnter = saveSection.enter()
-             .append('div')
-               .attr('class', 'qa-save save-section cf');
+               self._assignPluginFnProp(pluginFnProp, propName);
+             });
+           },
+           // Put deprecated properties in the private API, so as to not expose it to accidential
+           // discovery through inspection of the store object.
+           // Deprecated: addStorage
+           addStorage: function addStorage(storage) {
+             _warn('store.addStorage(storage) is deprecated. Use createStore([storages])');
 
-           // update
-           saveSection = saveSectionEnter
-             .merge(saveSection)
-               .call(qaSaveButtons);
-         }
+             this._addStorage(storage);
+           }
+         };
+         var store = create$2(_privateStoreProps, storeAPI, {
+           plugins: []
+         });
+         store.raw = {};
+         each$1(store, function (prop, propName) {
+           if (isFunction$1(prop)) {
+             store.raw[propName] = bind$2(store, prop);
+           }
+         });
+         each$1(storages, function (storage) {
+           store._addStorage(storage);
+         });
+         each$1(plugins, function (plugin) {
+           store._addPlugin(plugin);
+         });
+         return store;
+       }
 
-         function qaSaveButtons(selection) {
-           const isSelected = (_qaItem && _qaItem.id === context.selectedErrorID());
-           let buttonSection = selection.selectAll('.buttons')
-             .data((isSelected ? [_qaItem] : []), d => d.status + d.id);
+       var Global$1 = util.Global;
+       var localStorage_1 = {
+         name: 'localStorage',
+         read: read,
+         write: write,
+         each: each$2,
+         remove: remove$2,
+         clearAll: clearAll
+       };
 
-           // exit
-           buttonSection.exit()
-             .remove();
+       function localStorage$1() {
+         return Global$1.localStorage;
+       }
 
-           // enter
-           const buttonEnter = buttonSection.enter()
-             .append('div')
-               .attr('class', 'buttons');
+       function read(key) {
+         return localStorage$1().getItem(key);
+       }
 
-           buttonEnter
-             .append('button')
-               .attr('class', 'button close-button action');
+       function write(key, data) {
+         return localStorage$1().setItem(key, data);
+       }
 
-           buttonEnter
-             .append('button')
-               .attr('class', 'button ignore-button action');
+       function each$2(fn) {
+         for (var i = localStorage$1().length - 1; i >= 0; i--) {
+           var key = localStorage$1().key(i);
+           fn(read(key), key);
+         }
+       }
 
-           // update
-           buttonSection = buttonSection
-             .merge(buttonEnter);
+       function remove$2(key) {
+         return localStorage$1().removeItem(key);
+       }
 
-           buttonSection.select('.close-button')
-             .text(() => _t('QA.keepRight.close'))
-             .on('click.close', function(d) {
-               this.blur();    // avoid keeping focus on the button - #4641
-               const qaService = services.osmose;
-               if (qaService) {
-                 d.newStatus = 'done';
-                 qaService.postUpdate(d, (err, item) => dispatch$1.call('change', item));
-               }
-             });
+       function clearAll() {
+         return localStorage$1().clear();
+       }
+
+       // versions 6 and 7, where no localStorage, etc
+       // is available.
+
+       var Global$2 = util.Global;
+       var oldFFGlobalStorage = {
+         name: 'oldFF-globalStorage',
+         read: read$1,
+         write: write$1,
+         each: each$3,
+         remove: remove$3,
+         clearAll: clearAll$1
+       };
+       var globalStorage = Global$2.globalStorage;
+
+       function read$1(key) {
+         return globalStorage[key];
+       }
+
+       function write$1(key, data) {
+         globalStorage[key] = data;
+       }
 
-           buttonSection.select('.ignore-button')
-             .text(() => _t('QA.keepRight.ignore'))
-             .on('click.ignore', function(d) {
-               this.blur();    // avoid keeping focus on the button - #4641
-               const qaService = services.osmose;
-               if (qaService) {
-                 d.newStatus = 'false';
-                 qaService.postUpdate(d, (err, item) => dispatch$1.call('change', item));
-               }
-             });
+       function each$3(fn) {
+         for (var i = globalStorage.length - 1; i >= 0; i--) {
+           var key = globalStorage.key(i);
+           fn(globalStorage[key], key);
          }
+       }
 
-         // NOTE: Don't change method name until UI v3 is merged
-         osmoseEditor.error = function(val) {
-           if (!arguments.length) return _qaItem;
-           _qaItem = val;
-           return osmoseEditor;
-         };
+       function remove$3(key) {
+         return globalStorage.removeItem(key);
+       }
 
-         return utilRebind(osmoseEditor, dispatch$1, 'on');
+       function clearAll$1() {
+         each$3(function (key, _) {
+           delete globalStorage[key];
+         });
        }
 
-       // NOTE: Don't change name of this until UI v3 is merged
-       function modeSelectError(context, selectedErrorID, selectedErrorService) {
-           var mode = {
-               id: 'select-error',
-               button: 'browse'
-           };
+       // versions 6 and 7, where no localStorage, sessionStorage, etc
+       // is available.
 
-           var keybinding = utilKeybinding('select-error');
-
-           var errorService = services[selectedErrorService];
-           var errorEditor;
-           switch (selectedErrorService) {
-               case 'improveOSM':
-                   errorEditor = uiImproveOsmEditor(context)
-                   .on('change', function() {
-                       context.map().pan([0,0]);  // trigger a redraw
-                       var error = checkSelectedID();
-                       if (!error) return;
-                       context.ui().sidebar
-                           .show(errorEditor.error(error));
-                   });
-                   break;
-               case 'keepRight':
-                   errorEditor = uiKeepRightEditor(context)
-                   .on('change', function() {
-                       context.map().pan([0,0]);  // trigger a redraw
-                       var error = checkSelectedID();
-                       if (!error) return;
-                       context.ui().sidebar
-                           .show(errorEditor.error(error));
-                   });
-                   break;
-               case 'osmose':
-                   errorEditor = uiOsmoseEditor(context)
-                   .on('change', function() {
-                       context.map().pan([0,0]);  // trigger a redraw
-                       var error = checkSelectedID();
-                       if (!error) return;
-                       context.ui().sidebar
-                           .show(errorEditor.error(error));
-                   });
-                   break;
-           }
+       var Global$3 = util.Global;
+       var oldIEUserDataStorage = {
+         name: 'oldIE-userDataStorage',
+         write: write$2,
+         read: read$2,
+         each: each$4,
+         remove: remove$4,
+         clearAll: clearAll$2
+       };
+       var storageName = 'storejs';
+       var doc = Global$3.document;
 
+       var _withStorageEl = _makeIEStorageElFunction();
 
-           var behaviors = [
-               behaviorBreathe(),
-               behaviorHover(context),
-               behaviorSelect(context),
-               behaviorLasso(context),
-               modeDragNode(context).behavior,
-               modeDragNote(context).behavior
-           ];
+       var disable = (Global$3.navigator ? Global$3.navigator.userAgent : '').match(/ (MSIE 8|MSIE 9|MSIE 10)\./); // MSIE 9.x, MSIE 10.x
 
+       function write$2(unfixedKey, data) {
+         if (disable) {
+           return;
+         }
 
-           function checkSelectedID() {
-               if (!errorService) return;
-               var error = errorService.getError(selectedErrorID);
-               if (!error) {
-                   context.enter(modeBrowse(context));
-               }
-               return error;
-           }
+         var fixedKey = fixKey(unfixedKey);
 
+         _withStorageEl(function (storageEl) {
+           storageEl.setAttribute(fixedKey, data);
+           storageEl.save(storageName);
+         });
+       }
 
-           mode.zoomToSelected = function() {
-               if (!errorService) return;
-               var error = errorService.getError(selectedErrorID);
-               if (error) {
-                   context.map().centerZoomEase(error.loc, 20);
-               }
-           };
+       function read$2(unfixedKey) {
+         if (disable) {
+           return;
+         }
 
+         var fixedKey = fixKey(unfixedKey);
+         var res = null;
 
-           mode.enter = function() {
-               var error = checkSelectedID();
-               if (!error) return;
+         _withStorageEl(function (storageEl) {
+           res = storageEl.getAttribute(fixedKey);
+         });
 
-               behaviors.forEach(context.install);
-               keybinding
-                   .on(_t('inspector.zoom_to.key'), mode.zoomToSelected)
-                   .on('⎋', esc, true);
+         return res;
+       }
 
-               select(document)
-                   .call(keybinding);
+       function each$4(callback) {
+         _withStorageEl(function (storageEl) {
+           var attributes = storageEl.XMLDocument.documentElement.attributes;
 
-               selectError();
+           for (var i = attributes.length - 1; i >= 0; i--) {
+             var attr = attributes[i];
+             callback(storageEl.getAttribute(attr.name), attr.name);
+           }
+         });
+       }
 
-               var sidebar = context.ui().sidebar;
-               sidebar.show(errorEditor.error(error));
+       function remove$4(unfixedKey) {
+         var fixedKey = fixKey(unfixedKey);
 
-               context.map()
-                   .on('drawn.select-error', selectError);
+         _withStorageEl(function (storageEl) {
+           storageEl.removeAttribute(fixedKey);
+           storageEl.save(storageName);
+         });
+       }
 
+       function clearAll$2() {
+         _withStorageEl(function (storageEl) {
+           var attributes = storageEl.XMLDocument.documentElement.attributes;
+           storageEl.load(storageName);
 
-               // class the error as selected, or return to browse mode if the error is gone
-               function selectError(drawn) {
-                   if (!checkSelectedID()) return;
+           for (var i = attributes.length - 1; i >= 0; i--) {
+             storageEl.removeAttribute(attributes[i].name);
+           }
 
-                   var selection = context.surface()
-                       .selectAll('.itemId-' + selectedErrorID + '.' + selectedErrorService);
+           storageEl.save(storageName);
+         });
+       } // Helpers
+       //////////
+       // In IE7, keys cannot start with a digit or contain certain chars.
+       // See https://github.com/marcuswestin/store.js/issues/40
+       // See https://github.com/marcuswestin/store.js/issues/83
 
-                   if (selection.empty()) {
-                       // Return to browse mode if selected DOM elements have
-                       // disappeared because the user moved them out of view..
-                       var source = event && event.type === 'zoom' && event.sourceEvent;
-                       if (drawn && source && (source.type === 'pointermove' || source.type === 'mousemove' || source.type === 'touchmove')) {
-                           context.enter(modeBrowse(context));
-                       }
 
-                   } else {
-                       selection
-                           .classed('selected', true);
+       var forbiddenCharsRegex = new RegExp("[!\"#$%&'()*+,/\\\\:;<=>?@[\\]^`{|}~]", "g");
 
-                       context.selectedErrorID(selectedErrorID);
-                   }
-               }
+       function fixKey(key) {
+         return key.replace(/^\d/, '___$&').replace(forbiddenCharsRegex, '___');
+       }
 
-               function esc() {
-                   if (context.container().select('.combobox').size()) return;
-                   context.enter(modeBrowse(context));
-               }
-           };
+       function _makeIEStorageElFunction() {
+         if (!doc || !doc.documentElement || !doc.documentElement.addBehavior) {
+           return null;
+         }
 
+         var scriptTag = 'script',
+             storageOwner,
+             storageContainer,
+             storageEl; // Since #userData storage applies only to specific paths, we need to
+         // somehow link our data to a specific path.  We choose /favicon.ico
+         // as a pretty safe option, since all browsers already make a request to
+         // this URL anyway and being a 404 will not hurt us here.  We wrap an
+         // iframe pointing to the favicon in an ActiveXObject(htmlfile) object
+         // (see: http://msdn.microsoft.com/en-us/library/aa752574(v=VS.85).aspx)
+         // since the iframe access rules appear to allow direct access and
+         // manipulation of the document element, even for a 404 page.  This
+         // document can be used instead of the current document (which would
+         // have been limited to the current path) to perform #userData storage.
 
-           mode.exit = function() {
-               behaviors.forEach(context.uninstall);
+         try {
+           /* global ActiveXObject */
+           storageContainer = new ActiveXObject('htmlfile');
+           storageContainer.open();
+           storageContainer.write('<' + scriptTag + '>document.w=window</' + scriptTag + '><iframe src="/favicon.ico"></iframe>');
+           storageContainer.close();
+           storageOwner = storageContainer.w.frames[0].document;
+           storageEl = storageOwner.createElement('div');
+         } catch (e) {
+           // somehow ActiveXObject instantiation failed (perhaps some special
+           // security settings or otherwse), fall back to per-path storage
+           storageEl = doc.createElement('div');
+           storageOwner = doc.body;
+         }
+
+         return function (storeFunction) {
+           var args = [].slice.call(arguments, 0);
+           args.unshift(storageEl); // See http://msdn.microsoft.com/en-us/library/ms531081(v=VS.85).aspx
+           // and http://msdn.microsoft.com/en-us/library/ms531424(v=VS.85).aspx
+
+           storageOwner.appendChild(storageEl);
+           storageEl.addBehavior('#default#userData');
+           storageEl.load(storageName);
+           storeFunction.apply(this, args);
+           storageOwner.removeChild(storageEl);
+           return;
+         };
+       }
 
-               select(document)
-                   .call(keybinding.unbind);
+       // doesn't work but cookies do. This implementation is adopted from
+       // https://developer.mozilla.org/en-US/docs/Web/API/Storage/LocalStorage
 
-               context.surface()
-                   .selectAll('.qaItem.selected')
-                   .classed('selected hover', false);
+       var Global$4 = util.Global;
+       var trim$4 = util.trim;
+       var cookieStorage = {
+         name: 'cookieStorage',
+         read: read$3,
+         write: write$3,
+         each: each$5,
+         remove: remove$5,
+         clearAll: clearAll$3
+       };
+       var doc$1 = Global$4.document;
 
-               context.map()
-                   .on('drawn.select-error', null);
+       function read$3(key) {
+         if (!key || !_has(key)) {
+           return null;
+         }
 
-               context.ui().sidebar
-                   .hide();
+         var regexpStr = "(?:^|.*;\\s*)" + escape(key).replace(/[\-\.\+\*]/g, "\\$&") + "\\s*\\=\\s*((?:[^;](?!;))*[^;]?).*";
+         return unescape(doc$1.cookie.replace(new RegExp(regexpStr), "$1"));
+       }
 
-               context.selectedErrorID(null);
-               context.features().forceVisible([]);
-           };
+       function each$5(callback) {
+         var cookies = doc$1.cookie.split(/; ?/g);
 
+         for (var i = cookies.length - 1; i >= 0; i--) {
+           if (!trim$4(cookies[i])) {
+             continue;
+           }
 
-           return mode;
+           var kvp = cookies[i].split('=');
+           var key = unescape(kvp[0]);
+           var val = unescape(kvp[1]);
+           callback(val, key);
+         }
        }
 
-       function behaviorSelect(context) {
-           var _tolerancePx = 4; // see also behaviorDrag
-           var _lastMouseEvent = null;
-           var _showMenu = false;
-           var _downPointers = {};
-           var _longPressTimeout = null;
-           var _lastInteractionType = null;
-           // the id of the down pointer that's enabling multiselection while down
-           var _multiselectionPointerId = null;
+       function write$3(key, data) {
+         if (!key) {
+           return;
+         }
 
-           // use pointer events on supported platforms; fallback to mouse events
-           var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
+         doc$1.cookie = escape(key) + "=" + escape(data) + "; expires=Tue, 19 Jan 2038 03:14:07 GMT; path=/";
+       }
 
+       function remove$5(key) {
+         if (!key || !_has(key)) {
+           return;
+         }
 
-           function keydown() {
+         doc$1.cookie = escape(key) + "=; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/";
+       }
 
-               if (event.keyCode === 32) {
-                   // don't react to spacebar events during text input
-                   var activeNode = document.activeElement;
-                   if (activeNode && new Set(['INPUT', 'TEXTAREA']).has(activeNode.nodeName)) return;
-               }
+       function clearAll$3() {
+         each$5(function (_, key) {
+           remove$5(key);
+         });
+       }
 
-               if (event.keyCode === 93 ||  // context menu key
-                   event.keyCode === 32) {  // spacebar
-                   event.preventDefault();
-               }
+       function _has(key) {
+         return new RegExp("(?:^|;\\s*)" + escape(key).replace(/[\-\.\+\*]/g, "\\$&") + "\\s*\\=").test(doc$1.cookie);
+       }
 
-               if (event.repeat) return; // ignore repeated events for held keys
+       var Global$5 = util.Global;
+       var sessionStorage_1 = {
+         name: 'sessionStorage',
+         read: read$4,
+         write: write$4,
+         each: each$6,
+         remove: remove$6,
+         clearAll: clearAll$4
+       };
 
-               // if any key is pressed the user is probably doing something other than long-pressing
-               cancelLongPress();
+       function sessionStorage() {
+         return Global$5.sessionStorage;
+       }
 
-               if (event.shiftKey) {
-                   context.surface()
-                       .classed('behavior-multiselect', true);
-               }
+       function read$4(key) {
+         return sessionStorage().getItem(key);
+       }
 
-               if (event.keyCode === 32) {  // spacebar
-                   if (!_downPointers.spacebar && _lastMouseEvent) {
-                       cancelLongPress();
-                       _longPressTimeout = window.setTimeout(didLongPress, 500, 'spacebar', 'spacebar');
+       function write$4(key, data) {
+         return sessionStorage().setItem(key, data);
+       }
 
-                       _downPointers.spacebar = {
-                           firstEvent: _lastMouseEvent,
-                           lastEvent: _lastMouseEvent
-                       };
-                   }
-               }
-           }
+       function each$6(fn) {
+         for (var i = sessionStorage().length - 1; i >= 0; i--) {
+           var key = sessionStorage().key(i);
+           fn(read$4(key), key);
+         }
+       }
 
+       function remove$6(key) {
+         return sessionStorage().removeItem(key);
+       }
 
-           function keyup() {
-               cancelLongPress();
+       function clearAll$4() {
+         return sessionStorage().clear();
+       }
 
-               if (!event.shiftKey) {
-                   context.surface()
-                       .classed('behavior-multiselect', false);
-               }
+       // memoryStorage is a useful last fallback to ensure that the store
+       // is functions (meaning store.get(), store.set(), etc will all function).
+       // However, stored values will not persist when the browser navigates to
+       // a new page or reloads the current page.
+       var memoryStorage_1 = {
+         name: 'memoryStorage',
+         read: read$5,
+         write: write$5,
+         each: each$7,
+         remove: remove$7,
+         clearAll: clearAll$5
+       };
+       var memoryStorage = {};
 
-               if (event.keyCode === 93) {  // context menu key
-                   event.preventDefault();
-                   _lastInteractionType = 'menukey';
-                   contextmenu();
-               } else if (event.keyCode === 32) {  // spacebar
-                   var pointer = _downPointers.spacebar;
-                   if (pointer) {
-                       delete _downPointers.spacebar;
+       function read$5(key) {
+         return memoryStorage[key];
+       }
 
-                       if (pointer.done) return;
+       function write$5(key, data) {
+         memoryStorage[key] = data;
+       }
 
-                       event.preventDefault();
-                       _lastInteractionType = 'spacebar';
-                       click(pointer.firstEvent, pointer.lastEvent, 'spacebar');
-                   }
-               }
+       function each$7(callback) {
+         for (var key in memoryStorage) {
+           if (memoryStorage.hasOwnProperty(key)) {
+             callback(memoryStorage[key], key);
            }
+         }
+       }
 
+       function remove$7(key) {
+         delete memoryStorage[key];
+       }
 
-           function pointerdown() {
-               var id = (event.pointerId || 'mouse').toString();
-
-               cancelLongPress();
+       function clearAll$5(key) {
+         memoryStorage = {};
+       }
 
-               if (event.buttons && event.buttons !== 1) return;
+       var all = [// Listed in order of usage preference
+       localStorage_1, oldFFGlobalStorage, oldIEUserDataStorage, cookieStorage, sessionStorage_1, memoryStorage_1];
 
-               context.ui().closeEditMenu();
+       /* eslint-disable */
+       //  json2.js
+       //  2016-10-28
+       //  Public Domain.
+       //  NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
+       //  See http://www.JSON.org/js.html
+       //  This code should be minified before deployment.
+       //  See http://javascript.crockford.com/jsmin.html
+       //  USE YOUR OWN COPY. IT IS EXTREMELY UNWISE TO LOAD CODE FROM SERVERS YOU DO
+       //  NOT CONTROL.
+       //  This file creates a global JSON object containing two methods: stringify
+       //  and parse. This file provides the ES5 JSON capability to ES3 systems.
+       //  If a project might run on IE8 or earlier, then this file should be included.
+       //  This file does nothing on ES5 systems.
+       //      JSON.stringify(value, replacer, space)
+       //          value       any JavaScript value, usually an object or array.
+       //          replacer    an optional parameter that determines how object
+       //                      values are stringified for objects. It can be a
+       //                      function or an array of strings.
+       //          space       an optional parameter that specifies the indentation
+       //                      of nested structures. If it is omitted, the text will
+       //                      be packed without extra whitespace. If it is a number,
+       //                      it will specify the number of spaces to indent at each
+       //                      level. If it is a string (such as "\t" or "&nbsp;"),
+       //                      it contains the characters used to indent at each level.
+       //          This method produces a JSON text from a JavaScript value.
+       //          When an object value is found, if the object contains a toJSON
+       //          method, its toJSON method will be called and the result will be
+       //          stringified. A toJSON method does not serialize: it returns the
+       //          value represented by the name/value pair that should be serialized,
+       //          or undefined if nothing should be serialized. The toJSON method
+       //          will be passed the key associated with the value, and this will be
+       //          bound to the value.
+       //          For example, this would serialize Dates as ISO strings.
+       //              Date.prototype.toJSON = function (key) {
+       //                  function f(n) {
+       //                      // Format integers to have at least two digits.
+       //                      return (n < 10)
+       //                          ? "0" + n
+       //                          : n;
+       //                  }
+       //                  return this.getUTCFullYear()   + "-" +
+       //                       f(this.getUTCMonth() + 1) + "-" +
+       //                       f(this.getUTCDate())      + "T" +
+       //                       f(this.getUTCHours())     + ":" +
+       //                       f(this.getUTCMinutes())   + ":" +
+       //                       f(this.getUTCSeconds())   + "Z";
+       //              };
+       //          You can provide an optional replacer method. It will be passed the
+       //          key and value of each member, with this bound to the containing
+       //          object. The value that is returned from your method will be
+       //          serialized. If your method returns undefined, then the member will
+       //          be excluded from the serialization.
+       //          If the replacer parameter is an array of strings, then it will be
+       //          used to select the members to be serialized. It filters the results
+       //          such that only members with keys listed in the replacer array are
+       //          stringified.
+       //          Values that do not have JSON representations, such as undefined or
+       //          functions, will not be serialized. Such values in objects will be
+       //          dropped; in arrays they will be replaced with null. You can use
+       //          a replacer function to replace those with JSON values.
+       //          JSON.stringify(undefined) returns undefined.
+       //          The optional space parameter produces a stringification of the
+       //          value that is filled with line breaks and indentation to make it
+       //          easier to read.
+       //          If the space parameter is a non-empty string, then that string will
+       //          be used for indentation. If the space parameter is a number, then
+       //          the indentation will be that many spaces.
+       //          Example:
+       //          text = JSON.stringify(["e", {pluribus: "unum"}]);
+       //          // text is '["e",{"pluribus":"unum"}]'
+       //          text = JSON.stringify(["e", {pluribus: "unum"}], null, "\t");
+       //          // text is '[\n\t"e",\n\t{\n\t\t"pluribus": "unum"\n\t}\n]'
+       //          text = JSON.stringify([new Date()], function (key, value) {
+       //              return this[key] instanceof Date
+       //                  ? "Date(" + this[key] + ")"
+       //                  : value;
+       //          });
+       //          // text is '["Date(---current time---)"]'
+       //      JSON.parse(text, reviver)
+       //          This method parses a JSON text to produce an object or array.
+       //          It can throw a SyntaxError exception.
+       //          The optional reviver parameter is a function that can filter and
+       //          transform the results. It receives each of the keys and values,
+       //          and its return value is used instead of the original value.
+       //          If it returns what it received, then the structure is not modified.
+       //          If it returns undefined then the member is deleted.
+       //          Example:
+       //          // Parse the text. Values that look like ISO date strings will
+       //          // be converted to Date objects.
+       //          myData = JSON.parse(text, function (key, value) {
+       //              var a;
+       //              if (typeof value === "string") {
+       //                  a =
+       //   /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/.exec(value);
+       //                  if (a) {
+       //                      return new Date(Date.UTC(+a[1], +a[2] - 1, +a[3], +a[4],
+       //                          +a[5], +a[6]));
+       //                  }
+       //              }
+       //              return value;
+       //          });
+       //          myData = JSON.parse('["Date(09/09/2001)"]', function (key, value) {
+       //              var d;
+       //              if (typeof value === "string" &&
+       //                      value.slice(0, 5) === "Date(" &&
+       //                      value.slice(-1) === ")") {
+       //                  d = new Date(value.slice(5, -1));
+       //                  if (d) {
+       //                      return d;
+       //                  }
+       //              }
+       //              return value;
+       //          });
+       //  This is a reference implementation. You are free to copy, modify, or
+       //  redistribute.
 
-               _longPressTimeout = window.setTimeout(didLongPress, 500, id, 'longdown-' + (event.pointerType || 'mouse'));
+       /*jslint
+           eval, for, this
+       */
 
-               _downPointers[id] = {
-                   firstEvent: event,
-                   lastEvent: event
-               };
-           }
+       /*property
+           JSON, apply, call, charCodeAt, getUTCDate, getUTCFullYear, getUTCHours,
+           getUTCMinutes, getUTCMonth, getUTCSeconds, hasOwnProperty, join,
+           lastIndex, length, parse, prototype, push, replace, slice, stringify,
+           test, toJSON, toString, valueOf
+       */
+       // Create a JSON object only if one does not already exist. We create the
+       // methods in a closure to avoid creating global variables.
+       if ((typeof JSON === "undefined" ? "undefined" : _typeof(JSON)) !== "object") {
+         JSON = {};
+       }
 
+       (function () {
 
-           function didLongPress(id, interactionType) {
-               var pointer = _downPointers[id];
-               if (!pointer) return;
+         var rx_one = /^[\],:{}\s]*$/;
+         var rx_two = /\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g;
+         var rx_three = /"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g;
+         var rx_four = /(?:^|:|,)(?:\s*\[)+/g;
+         var rx_escapable = /[\\"\u0000-\u001f\u007f-\u009f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
+         var rx_dangerous = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;
 
-               for (var i in _downPointers) {
-                   // don't allow this or any currently down pointer to trigger another click
-                   _downPointers[i].done = true;
-               }
+         function f(n) {
+           // Format integers to have at least two digits.
+           return n < 10 ? "0" + n : n;
+         }
 
-               // treat long presses like right-clicks
-               _longPressTimeout = null;
-               _lastInteractionType = interactionType;
-               _showMenu = true;
+         function this_value() {
+           return this.valueOf();
+         }
 
-               click(pointer.firstEvent, pointer.lastEvent, id);
-           }
+         if (typeof Date.prototype.toJSON !== "function") {
+           Date.prototype.toJSON = function () {
+             return isFinite(this.valueOf()) ? this.getUTCFullYear() + "-" + f(this.getUTCMonth() + 1) + "-" + f(this.getUTCDate()) + "T" + f(this.getUTCHours()) + ":" + f(this.getUTCMinutes()) + ":" + f(this.getUTCSeconds()) + "Z" : null;
+           };
 
+           Boolean.prototype.toJSON = this_value;
+           Number.prototype.toJSON = this_value;
+           String.prototype.toJSON = this_value;
+         }
 
-           function pointermove() {
-               var id = (event.pointerId || 'mouse').toString();
-               if (_downPointers[id]) {
-                   _downPointers[id].lastEvent = event;
-               }
-               if (!event.pointerType || event.pointerType === 'mouse') {
-                   _lastMouseEvent = event;
-                   if (_downPointers.spacebar) {
-                       _downPointers.spacebar.lastEvent = event;
-                   }
-               }
-           }
+         var gap;
+         var indent;
+         var meta;
+         var rep;
 
+         function quote(string) {
+           // If the string contains no control characters, no quote characters, and no
+           // backslash characters, then we can safely slap some quotes around it.
+           // Otherwise we must also replace the offending characters with safe escape
+           // sequences.
+           rx_escapable.lastIndex = 0;
+           return rx_escapable.test(string) ? "\"" + string.replace(rx_escapable, function (a) {
+             var c = meta[a];
+             return typeof c === "string" ? c : "\\u" + ("0000" + a.charCodeAt(0).toString(16)).slice(-4);
+           }) + "\"" : "\"" + string + "\"";
+         }
 
-           function pointerup() {
-               var id = (event.pointerId || 'mouse').toString();
-               var pointer = _downPointers[id];
-               if (!pointer) return;
+         function str(key, holder) {
+           // Produce a string from holder[key].
+           var i; // The loop counter.
 
-               delete _downPointers[id];
+           var k; // The member key.
 
-               if (_multiselectionPointerId === id) {
-                   _multiselectionPointerId = null;
-               }
+           var v; // The member value.
 
-               if (pointer.done) return;
+           var length;
+           var mind = gap;
+           var partial;
+           var value = holder[key]; // If the value has a toJSON method, call it to obtain a replacement value.
 
-               click(pointer.firstEvent, event, id);
-           }
+           if (value && _typeof(value) === "object" && typeof value.toJSON === "function") {
+             value = value.toJSON(key);
+           } // If we were called with a replacer function, then call the replacer to
+           // obtain a replacement value.
 
 
-           function pointercancel() {
-               var id = (event.pointerId || 'mouse').toString();
-               if (!_downPointers[id]) return;
+           if (typeof rep === "function") {
+             value = rep.call(holder, key, value);
+           } // What happens next depends on the value's type.
 
-               delete _downPointers[id];
 
-               if (_multiselectionPointerId === id) {
-                   _multiselectionPointerId = null;
-               }
-           }
+           switch (_typeof(value)) {
+             case "string":
+               return quote(value);
 
+             case "number":
+               // JSON numbers must be finite. Encode non-finite numbers as null.
+               return isFinite(value) ? String(value) : "null";
 
-           function contextmenu() {
-               var e = event;
-               e.preventDefault();
+             case "boolean":
+             case "null":
+               // If the value is a boolean or null, convert it to a string. Note:
+               // typeof null does not produce "null". The case is included here in
+               // the remote chance that this gets fixed someday.
+               return String(value);
+             // If the type is "object", we might be dealing with an object or an array or
+             // null.
 
-               if (!+e.clientX && !+e.clientY) {
-                   if (_lastMouseEvent) {
-                       e.sourceEvent = _lastMouseEvent;
-                   } else {
-                       return;
-                   }
-               } else {
-                   _lastMouseEvent = event;
-                   _lastInteractionType = 'rightclick';
-               }
+             case "object":
+               // Due to a specification blunder in ECMAScript, typeof null is "object",
+               // so watch out for that case.
+               if (!value) {
+                 return "null";
+               } // Make an array to hold the partial results of stringifying this object value.
 
-               _showMenu = true;
-               click(event, event);
-           }
 
+               gap += indent;
+               partial = []; // Is the value an array?
 
-           function click(firstEvent, lastEvent, pointerId) {
-               cancelLongPress();
+               if (Object.prototype.toString.apply(value) === "[object Array]") {
+                 // The value is an array. Stringify every element. Use null as a placeholder
+                 // for non-JSON values.
+                 length = value.length;
 
-               var mapNode = context.container().select('.main-map').node();
+                 for (i = 0; i < length; i += 1) {
+                   partial[i] = str(i, value) || "null";
+                 } // Join all of the elements together, separated with commas, and wrap them in
+                 // brackets.
 
-               // Use the `main-map` coordinate system since the surface and supersurface
-               // are transformed when drag-panning.
-               var pointGetter = utilFastMouse(mapNode);
-               var p1 = pointGetter(firstEvent);
-               var p2 = pointGetter(lastEvent);
-               var dist = geoVecLength(p1, p2);
 
-               if (dist > _tolerancePx ||
-                   !mapContains(lastEvent)) {
+                 v = partial.length === 0 ? "[]" : gap ? "[\n" + gap + partial.join(",\n" + gap) + "\n" + mind + "]" : "[" + partial.join(",") + "]";
+                 gap = mind;
+                 return v;
+               } // If the replacer is an array, use it to select the members to be stringified.
 
-                   resetProperties();
-                   return;
-               }
 
-               var targetDatum = lastEvent.target.__data__;
+               if (rep && _typeof(rep) === "object") {
+                 length = rep.length;
 
-               var multiselectEntityId;
+                 for (i = 0; i < length; i += 1) {
+                   if (typeof rep[i] === "string") {
+                     k = rep[i];
+                     v = str(k, value);
 
-               if (!_multiselectionPointerId) {
-                   // If a different pointer than the one triggering this click is down on a
-                   // feature, treat this and all future clicks as multiselection until that
-                   // pointer is raised.
-                   var selectPointerInfo = pointerDownOnSelection(pointerId);
-                   if (selectPointerInfo) {
-                       _multiselectionPointerId = selectPointerInfo.pointerId;
-                       // if the other feature isn't selected yet, make sure we select it
-                       multiselectEntityId = !selectPointerInfo.selected && selectPointerInfo.entityId;
-                       _downPointers[selectPointerInfo.pointerId].done = true;
+                     if (v) {
+                       partial.push(quote(k) + (gap ? ": " : ":") + v);
+                     }
                    }
-               }
+                 }
+               } else {
+                 // Otherwise, iterate through all of the keys in the object.
+                 for (k in value) {
+                   if (Object.prototype.hasOwnProperty.call(value, k)) {
+                     v = str(k, value);
 
-               // support multiselect if data is already selected
-               var isMultiselect = context.mode().id === 'select' && (
-                   // and shift key is down
-                   (event && event.shiftKey) ||
-                   // or we're lasso-selecting
-                   context.surface().select('.lasso').node() ||
-                   // or a pointer is down over a selected feature
-                   (_multiselectionPointerId && !multiselectEntityId)
-               );
+                     if (v) {
+                       partial.push(quote(k) + (gap ? ": " : ":") + v);
+                     }
+                   }
+                 }
+               } // Join all of the member texts together, separated with commas,
+               // and wrap them in braces.
 
-               processClick(targetDatum, isMultiselect, p2, multiselectEntityId);
 
-               function mapContains(event) {
-                   var rect = mapNode.getBoundingClientRect();
-                   return event.clientX >= rect.left &&
-                       event.clientX <= rect.right &&
-                       event.clientY >= rect.top &&
-                       event.clientY <= rect.bottom;
-               }
+               v = partial.length === 0 ? "{}" : gap ? "{\n" + gap + partial.join(",\n" + gap) + "\n" + mind + "}" : "{" + partial.join(",") + "}";
+               gap = mind;
+               return v;
+           }
+         } // If the JSON object does not yet have a stringify method, give it one.
 
-               function pointerDownOnSelection(skipPointerId) {
-                   var mode = context.mode();
-                   var selectedIDs = mode.id === 'select' ? mode.selectedIDs() : [];
-                   for (var pointerId in _downPointers) {
-                       if (pointerId === 'spacebar' || pointerId === skipPointerId) continue;
 
-                       var pointerInfo = _downPointers[pointerId];
+         if (typeof JSON.stringify !== "function") {
+           meta = {
+             // table of character substitutions
+             "\b": "\\b",
+             "\t": "\\t",
+             "\n": "\\n",
+             "\f": "\\f",
+             "\r": "\\r",
+             "\"": "\\\"",
+             "\\": "\\\\"
+           };
 
-                       var p1 = pointGetter(pointerInfo.firstEvent);
-                       var p2 = pointGetter(pointerInfo.lastEvent);
-                       if (geoVecLength(p1, p2) > _tolerancePx) continue;
+           JSON.stringify = function (value, replacer, space) {
+             // The stringify method takes a value and an optional replacer, and an optional
+             // space parameter, and returns a JSON text. The replacer can be a function
+             // that can replace values, or an array of strings that will select the keys.
+             // A default replacer method can be provided. Use of the space parameter can
+             // produce text that is more easily readable.
+             var i;
+             gap = "";
+             indent = ""; // If the space parameter is a number, make an indent string containing that
+             // many spaces.
 
-                       var datum = pointerInfo.firstEvent.target.__data__;
-                       var entity = (datum && datum.properties && datum.properties.entity) || datum;
-                       if (context.graph().hasEntity(entity.id)) return {
-                           pointerId: pointerId,
-                           entityId: entity.id,
-                           selected: selectedIDs.indexOf(entity.id) !== -1
-                       };
-                   }
-                   return null;
-               }
-           }
+             if (typeof space === "number") {
+               for (i = 0; i < space; i += 1) {
+                 indent += " ";
+               } // If the space parameter is a string, it will be used as the indent string.
 
+             } else if (typeof space === "string") {
+               indent = space;
+             } // If there is a replacer, it must be a function or an array.
+             // Otherwise, throw an error.
 
-           function processClick(datum, isMultiselect, point, alsoSelectId) {
-               var mode = context.mode();
-               var showMenu = _showMenu;
-               var interactionType = _lastInteractionType;
 
-               var entity = datum && datum.properties && datum.properties.entity;
-               if (entity) datum = entity;
+             rep = replacer;
 
-               if (datum && datum.type === 'midpoint') {
-                   // treat targeting midpoints as if targeting the parent way
-                   datum = datum.parents[0];
-               }
+             if (replacer && typeof replacer !== "function" && (_typeof(replacer) !== "object" || typeof replacer.length !== "number")) {
+               throw new Error("JSON.stringify");
+             } // Make a fake root object containing our value under the key of "".
+             // Return the result of stringifying the value.
 
-               var newMode;
 
-               if (datum instanceof osmEntity) {
-                   // targeting an entity
-                   var selectedIDs = context.selectedIDs();
-                   context.selectedNoteID(null);
-                   context.selectedErrorID(null);
-
-                   if (!isMultiselect) {
-                       // don't change the selection if we're toggling the menu atop a multiselection
-                       if (!showMenu ||
-                           selectedIDs.length <= 1 ||
-                           selectedIDs.indexOf(datum.id) === -1) {
-
-                           if (alsoSelectId === datum.id) alsoSelectId = null;
-
-                           selectedIDs = (alsoSelectId ? [alsoSelectId] : []).concat([datum.id]);
-                           // always enter modeSelect even if the entity is already
-                           // selected since listeners may expect `context.enter` events,
-                           // e.g. in the walkthrough
-                           newMode = mode.id === 'select' ? mode.selectedIDs(selectedIDs) : modeSelect(context, selectedIDs).selectBehavior(behavior);
-                           context.enter(newMode);
-                       }
+             return str("", {
+               "": value
+             });
+           };
+         } // If the JSON object does not yet have a parse method, give it one.
 
-                   } else {
-                       if (selectedIDs.indexOf(datum.id) !== -1) {
-                           // clicked entity is already in the selectedIDs list..
-                           if (!showMenu) {
-                               // deselect clicked entity, then reenter select mode or return to browse mode..
-                               selectedIDs = selectedIDs.filter(function(id) { return id !== datum.id; });
-                               newMode = selectedIDs.length ? mode.selectedIDs(selectedIDs) : modeBrowse(context).selectBehavior(behavior);
-                               context.enter(newMode);
-                           }
-                       } else {
-                           // clicked entity is not in the selected list, add it..
-                           selectedIDs = selectedIDs.concat([datum.id]);
-                           newMode = mode.selectedIDs(selectedIDs);
-                           context.enter(newMode);
-                       }
-                   }
 
-               } else if (datum && datum.__featurehash__ && !isMultiselect) {
-                   // targeting custom data
-                   context
-                       .selectedNoteID(null)
-                       .enter(modeSelectData(context, datum));
+         if (typeof JSON.parse !== "function") {
+           JSON.parse = function (text, reviver) {
+             // The parse method takes a text and an optional reviver function, and returns
+             // a JavaScript value if the text is a valid JSON text.
+             var j;
 
-               } else if (datum instanceof osmNote && !isMultiselect) {
-                   // targeting a note
-                   context
-                       .selectedNoteID(datum.id)
-                       .enter(modeSelectNote(context, datum.id));
+             function walk(holder, key) {
+               // The walk method is used to recursively walk the resulting structure so
+               // that modifications can be made.
+               var k;
+               var v;
+               var value = holder[key];
 
-               } else if (datum instanceof QAItem & !isMultiselect) {
-                   // targeting an external QA issue
-                   context
-                       .selectedErrorID(datum.id)
-                       .enter(modeSelectError(context, datum.id, datum.service));
+               if (value && _typeof(value) === "object") {
+                 for (k in value) {
+                   if (Object.prototype.hasOwnProperty.call(value, k)) {
+                     v = walk(value, k);
 
-               } else {
-                   // targeting nothing
-                   context.selectedNoteID(null);
-                   context.selectedErrorID(null);
-                   if (!isMultiselect && mode.id !== 'browse') {
-                       context.enter(modeBrowse(context));
+                     if (v !== undefined) {
+                       value[k] = v;
+                     } else {
+                       delete value[k];
+                     }
                    }
+                 }
                }
 
-               context.ui().closeEditMenu();
-
-               // always request to show the edit menu in case the mode needs it
-               if (showMenu) context.ui().showEditMenu(point, interactionType);
-
-               resetProperties();
-           }
-
-
-           function cancelLongPress() {
-               if (_longPressTimeout) window.clearTimeout(_longPressTimeout);
-               _longPressTimeout = null;
-           }
-
+               return reviver.call(holder, key, value);
+             } // Parsing happens in four stages. In the first stage, we replace certain
+             // Unicode characters with escape sequences. JavaScript handles many characters
+             // incorrectly, either silently deleting them, or treating them as line endings.
 
-           function resetProperties() {
-               cancelLongPress();
-               _showMenu = false;
-               _lastInteractionType = null;
-               // don't reset _lastMouseEvent since it might still be useful
-           }
-
-
-           function behavior(selection) {
-               resetProperties();
-               _lastMouseEvent = context.map().lastPointerEvent();
-
-               select(window)
-                   .on('keydown.select', keydown)
-                   .on('keyup.select', keyup)
-                   .on(_pointerPrefix + 'move.select', pointermove, true)
-                   .on(_pointerPrefix + 'up.select', pointerup, true)
-                   .on('pointercancel.select', pointercancel, true)
-                   .on('contextmenu.select-window', function() {
-                       // Edge and IE really like to show the contextmenu on the
-                       // menubar when user presses a keyboard menu button
-                       // even after we've already preventdefaulted the key event.
-                       var e = event;
-                       if (+e.clientX === 0 && +e.clientY === 0) {
-                           event.preventDefault();
-                       }
-                   });
 
-               selection
-                   .on(_pointerPrefix + 'down.select', pointerdown)
-                   .on('contextmenu.select', contextmenu);
+             text = String(text);
+             rx_dangerous.lastIndex = 0;
 
-               if (event && event.shiftKey) {
-                   context.surface()
-                       .classed('behavior-multiselect', true);
-               }
-           }
+             if (rx_dangerous.test(text)) {
+               text = text.replace(rx_dangerous, function (a) {
+                 return "\\u" + ("0000" + a.charCodeAt(0).toString(16)).slice(-4);
+               });
+             } // In the second stage, we run the text against regular expressions that look
+             // for non-JSON patterns. We are especially concerned with "()" and "new"
+             // because they can cause invocation, and "=" because it can cause mutation.
+             // But just to be safe, we want to reject all unexpected forms.
+             // We split the second stage into 4 regexp operations in order to work around
+             // crippling inefficiencies in IE's and Safari's regexp engines. First we
+             // replace the JSON backslash pairs with "@" (a non-JSON character). Second, we
+             // replace all simple value tokens with "]" characters. Third, we delete all
+             // open brackets that follow a colon or comma or that begin the text. Finally,
+             // we look to see that the remaining characters are only whitespace or "]" or
+             // "," or ":" or "{" or "}". If that is so, then the text is safe for eval.
 
 
-           behavior.off = function(selection) {
-               cancelLongPress();
+             if (rx_one.test(text.replace(rx_two, "@").replace(rx_three, "]").replace(rx_four, ""))) {
+               // In the third stage we use the eval function to compile the text into a
+               // JavaScript structure. The "{" operator is subject to a syntactic ambiguity
+               // in JavaScript: it can begin a block or an object literal. We wrap the text
+               // in parens to eliminate the ambiguity.
+               j = eval("(" + text + ")"); // In the optional fourth stage, we recursively walk the new structure, passing
+               // each name/value pair to a reviver function for possible transformation.
 
-               select(window)
-                   .on('keydown.select', null)
-                   .on('keyup.select', null)
-                   .on('contextmenu.select-window', null)
-                   .on(_pointerPrefix + 'move.select', null, true)
-                   .on(_pointerPrefix + 'up.select', null, true)
-                   .on('pointercancel.select', null, true);
+               return typeof reviver === "function" ? walk({
+                 "": j
+               }, "") : j;
+             } // If the text is not JSON parseable, then a SyntaxError is thrown.
 
-               selection
-                   .on(_pointerPrefix + 'down.select', null)
-                   .on('contextmenu.select', null);
 
-               context.surface()
-                   .classed('behavior-multiselect', false);
+             throw new SyntaxError("JSON.parse");
            };
+         }
+       })();
 
+       var json2 = json2Plugin;
 
-           return behavior;
+       function json2Plugin() {
+         return {};
        }
 
-       function behaviorDrawWay(context, wayID, mode, startGraph) {
-
-           var dispatch$1 = dispatch('rejectedSelfIntersection');
+       var plugins = [json2];
+       var store_legacy = storeEngine.createStore(all, plugins);
 
-           var behavior = behaviorDraw(context);
+       //
+       // This code is only compatible with IE10+ because the [XDomainRequest](http://bit.ly/LfO7xo)
+       // object, IE<10's idea of [CORS](http://en.wikipedia.org/wiki/Cross-origin_resource_sharing),
+       // does not support custom headers, which this uses everywhere.
 
-           // Must be set by `drawWay.nodeIndex` before each install of this behavior.
-           var _nodeIndex;
 
-           var _origWay;
-           var _wayGeometry;
-           var _headNodeID;
-           var _annotation;
+       var osmAuth = function osmAuth(o) {
+         var oauth = {}; // authenticated users will also have a request token secret, but it's
+         // not used in transactions with the server
 
-           var _pointerHasMoved = false;
+         oauth.authenticated = function () {
+           return !!(token('oauth_token') && token('oauth_token_secret'));
+         };
 
-           // The osmNode to be placed.
-           // This is temporary and just follows the mouse cursor until an "add" event occurs.
-           var _drawNode;
+         oauth.logout = function () {
+           token('oauth_token', '');
+           token('oauth_token_secret', '');
+           token('oauth_request_token_secret', '');
+           return oauth;
+         }; // TODO: detect lack of click event
+
+
+         oauth.authenticate = function (callback) {
+           if (oauth.authenticated()) return callback();
+           oauth.logout(); // ## Getting a request token
+
+           var params = timenonce(getAuth(o)),
+               url = o.url + '/oauth/request_token';
+           params.oauth_signature = ohauth_1.signature(o.oauth_secret, '', ohauth_1.baseString('POST', url, params));
+
+           if (!o.singlepage) {
+             // Create a 600x550 popup window in the center of the screen
+             var w = 600,
+                 h = 550,
+                 settings = [['width', w], ['height', h], ['left', screen.width / 2 - w / 2], ['top', screen.height / 2 - h / 2]].map(function (x) {
+               return x.join('=');
+             }).join(','),
+                 popup = window.open('about:blank', 'oauth_window', settings);
+             oauth.popupWindow = popup;
+
+             if (!popup) {
+               var error = new Error('Popup was blocked');
+               error.status = 'popup-blocked';
+               throw error;
+             }
+           } // Request a request token. When this is complete, the popup
+           // window is redirected to OSM's authorization page.
+
+
+           ohauth_1.xhr('POST', url, params, null, {}, reqTokenDone);
+           o.loading();
+
+           function reqTokenDone(err, xhr) {
+             o.done();
+             if (err) return callback(err);
+             var resp = ohauth_1.stringQs(xhr.response);
+             token('oauth_request_token_secret', resp.oauth_token_secret);
+             var authorize_url = o.url + '/oauth/authorize?' + ohauth_1.qsString({
+               oauth_token: resp.oauth_token,
+               oauth_callback: resolveUrl$1(o.landing)
+             });
 
-           var _didResolveTempEdit = false;
+             if (o.singlepage) {
+               location.href = authorize_url;
+             } else {
+               popup.location = authorize_url;
+             }
+           } // Called by a function in a landing page, in the popup window. The
+           // window closes itself.
 
-           function createDrawNode(loc) {
-               // don't make the draw node until we actually need it
-               _drawNode = osmNode({ loc: loc });
 
-               context.pauseChangeDispatch();
-               context.replace(function actionAddDrawNode(graph) {
-                   // add the draw node to the graph and insert it into the way
-                   var way = graph.entity(wayID);
-                   return graph
-                       .replace(_drawNode)
-                       .replace(way.addNode(_drawNode.id, _nodeIndex));
-               }, _annotation);
-               context.resumeChangeDispatch();
+           window.authComplete = function (token) {
+             var oauth_token = ohauth_1.stringQs(token.split('?')[1]);
+             get_access_token(oauth_token.oauth_token);
+             delete window.authComplete;
+           }; // ## Getting an request token
+           //
+           // At this point we have an `oauth_token`, brought in from a function
+           // call on a landing page popup.
 
-               setActiveElements();
-           }
 
-           function removeDrawNode() {
+           function get_access_token(oauth_token) {
+             var url = o.url + '/oauth/access_token',
+                 params = timenonce(getAuth(o)),
+                 request_token_secret = token('oauth_request_token_secret');
+             params.oauth_token = oauth_token;
+             params.oauth_signature = ohauth_1.signature(o.oauth_secret, request_token_secret, ohauth_1.baseString('POST', url, params)); // ## Getting an access token
+             //
+             // The final token required for authentication. At this point
+             // we have a `request token secret`
 
-               context.pauseChangeDispatch();
-               context.replace(
-                   function actionDeleteDrawNode(graph) {
-                      var way = graph.entity(wayID);
-                      return graph
-                          .replace(way.removeNode(_drawNode.id))
-                          .remove(_drawNode);
-                  },
-                   _annotation
-               );
-               _drawNode = undefined;
-               context.resumeChangeDispatch();
+             ohauth_1.xhr('POST', url, params, null, {}, accessTokenDone);
+             o.loading();
            }
 
-
-           function keydown() {
-               if (event.keyCode === utilKeybinding.modifierCodes.alt) {
-                   if (context.surface().classed('nope')) {
-                       context.surface()
-                           .classed('nope-suppressed', true);
-                   }
-                   context.surface()
-                       .classed('nope', false)
-                       .classed('nope-disabled', true);
-               }
+           function accessTokenDone(err, xhr) {
+             o.done();
+             if (err) return callback(err);
+             var access_token = ohauth_1.stringQs(xhr.response);
+             token('oauth_token', access_token.oauth_token);
+             token('oauth_token_secret', access_token.oauth_token_secret);
+             callback(null, oauth);
            }
+         };
 
+         oauth.bringPopupWindowToFront = function () {
+           var brougtPopupToFront = false;
 
-           function keyup() {
-               if (event.keyCode === utilKeybinding.modifierCodes.alt) {
-                   if (context.surface().classed('nope-suppressed')) {
-                       context.surface()
-                           .classed('nope', true);
-                   }
-                   context.surface()
-                       .classed('nope-suppressed', false)
-                       .classed('nope-disabled', false);
-               }
+           try {
+             // This may cause a cross-origin error:
+             // `DOMException: Blocked a frame with origin "..." from accessing a cross-origin frame.`
+             if (oauth.popupWindow && !oauth.popupWindow.closed) {
+               oauth.popupWindow.focus();
+               brougtPopupToFront = true;
+             }
+           } catch (err) {// Bringing popup window to front failed (probably because of the cross-origin error mentioned above)
            }
 
+           return brougtPopupToFront;
+         };
 
-           function allowsVertex(d) {
-               return d.geometry(context.graph()) === 'vertex' || _mainPresetIndex.allowsVertex(d, context.graph());
-           }
+         oauth.bootstrapToken = function (oauth_token, callback) {
+           // ## Getting an request token
+           // At this point we have an `oauth_token`, brought in from a function
+           // call on a landing page popup.
+           function get_access_token(oauth_token) {
+             var url = o.url + '/oauth/access_token',
+                 params = timenonce(getAuth(o)),
+                 request_token_secret = token('oauth_request_token_secret');
+             params.oauth_token = oauth_token;
+             params.oauth_signature = ohauth_1.signature(o.oauth_secret, request_token_secret, ohauth_1.baseString('POST', url, params)); // ## Getting an access token
+             // The final token required for authentication. At this point
+             // we have a `request token secret`
 
+             ohauth_1.xhr('POST', url, params, null, {}, accessTokenDone);
+             o.loading();
+           }
 
-           // related code
-           // - `mode/drag_node.js`     `doMove()`
-           // - `behavior/draw.js`      `click()`
-           // - `behavior/draw_way.js`  `move()`
-           function move(datum) {
+           function accessTokenDone(err, xhr) {
+             o.done();
+             if (err) return callback(err);
+             var access_token = ohauth_1.stringQs(xhr.response);
+             token('oauth_token', access_token.oauth_token);
+             token('oauth_token_secret', access_token.oauth_token_secret);
+             callback(null, oauth);
+           }
 
-               var loc = context.map().mouseCoordinates();
+           get_access_token(oauth_token);
+         }; // # xhr
+         //
+         // A single XMLHttpRequest wrapper that does authenticated calls if the
+         // user has logged in.
 
-               if (!_drawNode) createDrawNode(loc);
 
-               context.surface().classed('nope-disabled', event.altKey);
+         oauth.xhr = function (options, callback) {
+           if (!oauth.authenticated()) {
+             if (o.auto) {
+               return oauth.authenticate(run);
+             } else {
+               callback('not authenticated', null);
+               return;
+             }
+           } else {
+             return run();
+           }
 
-               var targetLoc = datum && datum.properties && datum.properties.entity &&
-                   allowsVertex(datum.properties.entity) && datum.properties.entity.loc;
-               var targetNodes = datum && datum.properties && datum.properties.nodes;
+           function run() {
+             var params = timenonce(getAuth(o)),
+                 oauth_token_secret = token('oauth_token_secret'),
+                 url = options.prefix !== false ? o.url + options.path : options.path,
+                 url_parts = url.replace(/#.*$/, '').split('?', 2),
+                 base_url = url_parts[0],
+                 query = url_parts.length === 2 ? url_parts[1] : ''; // https://tools.ietf.org/html/rfc5849#section-3.4.1.3.1
 
-               if (targetLoc) {   // snap to node/vertex - a point target with `.loc`
-                   loc = targetLoc;
+             if ((!options.options || !options.options.header || options.options.header['Content-Type'] === 'application/x-www-form-urlencoded') && options.content) {
+               params = immutable(params, ohauth_1.stringQs(options.content));
+             }
 
-               } else if (targetNodes) {   // snap to way - a line target with `.nodes`
-                   var choice = geoChooseEdge(targetNodes, context.map().mouse(), context.projection, _drawNode.id);
-                   if (choice) {
-                       loc = choice.loc;
-                   }
-               }
+             params.oauth_token = token('oauth_token');
+             params.oauth_signature = ohauth_1.signature(o.oauth_secret, oauth_token_secret, ohauth_1.baseString(options.method, base_url, immutable(params, ohauth_1.stringQs(query))));
+             return ohauth_1.xhr(options.method, url, params, options.content, options.options, done);
+           }
 
-               context.replace(actionMoveNode(_drawNode.id, loc), _annotation);
-               _drawNode = context.entity(_drawNode.id);
-               checkGeometry(true /* includeDrawNode */);
+           function done(err, xhr) {
+             if (err) return callback(err);else if (xhr.responseXML) return callback(err, xhr.responseXML);else return callback(err, xhr.response);
            }
+         }; // pre-authorize this object, if we can just get a token and token_secret
+         // from the start
 
 
-           // Check whether this edit causes the geometry to break.
-           // If so, class the surface with a nope cursor.
-           // `includeDrawNode` - Only check the relevant line segments if finishing drawing
-           function checkGeometry(includeDrawNode) {
-               var nopeDisabled = context.surface().classed('nope-disabled');
-               var isInvalid = isInvalidGeometry(includeDrawNode);
+         oauth.preauth = function (c) {
+           if (!c) return;
+           if (c.oauth_token) token('oauth_token', c.oauth_token);
+           if (c.oauth_token_secret) token('oauth_token_secret', c.oauth_token_secret);
+           return oauth;
+         };
 
-               if (nopeDisabled) {
-                   context.surface()
-                       .classed('nope', false)
-                       .classed('nope-suppressed', isInvalid);
-               } else {
-                   context.surface()
-                       .classed('nope', isInvalid)
-                       .classed('nope-suppressed', false);
-               }
-           }
+         oauth.options = function (_) {
+           if (!arguments.length) return o;
+           o = _;
+           o.url = o.url || 'https://www.openstreetmap.org';
+           o.landing = o.landing || 'land.html';
+           o.singlepage = o.singlepage || false; // Optional loading and loading-done functions for nice UI feedback.
+           // by default, no-ops
 
+           o.loading = o.loading || function () {};
 
-           function isInvalidGeometry(includeDrawNode) {
+           o.done = o.done || function () {};
 
-               var testNode = _drawNode;
+           return oauth.preauth(o);
+         }; // 'stamp' an authentication object from `getAuth()`
+         // with a [nonce](http://en.wikipedia.org/wiki/Cryptographic_nonce)
+         // and timestamp
 
-               // we only need to test the single way we're drawing
-               var parentWay = context.graph().entity(wayID);
-               var nodes = context.graph().childNodes(parentWay).slice();  // shallow copy
 
-               if (includeDrawNode) {
-                   if (parentWay.isClosed()) {
-                       // don't test the last segment for closed ways - #4655
-                       // (still test the first segement)
-                       nodes.pop();
-                   }
-               } else { // discount the draw node
+         function timenonce(o) {
+           o.oauth_timestamp = ohauth_1.timestamp();
+           o.oauth_nonce = ohauth_1.nonce();
+           return o;
+         } // get/set tokens. These are prefixed with the base URL so that `osm-auth`
+         // can be used with multiple APIs and the keys in `localStorage`
+         // will not clash
 
-                   if (parentWay.isClosed()) {
-                       if (nodes.length < 3) return false;
-                       if (_drawNode) nodes.splice(-2, 1);
-                       testNode = nodes[nodes.length - 2];
-                   } else {
-                       // there's nothing we need to test if we ignore the draw node on open ways
-                       return false;
-                   }
-               }
 
-               return testNode && geoHasSelfIntersections(nodes, testNode.id);
-           }
+         var token;
 
+         if (store_legacy.enabled) {
+           token = function token(x, y) {
+             if (arguments.length === 1) return store_legacy.get(o.url + x);else if (arguments.length === 2) return store_legacy.set(o.url + x, y);
+           };
+         } else {
+           var storage = {};
 
-           function undone() {
+           token = function token(x, y) {
+             if (arguments.length === 1) return storage[o.url + x];else if (arguments.length === 2) return storage[o.url + x] = y;
+           };
+         } // Get an authentication object. If you just add and remove properties
+         // from a single object, you'll need to use `delete` to make sure that
+         // it doesn't contain undesired properties for authentication
 
-               // undoing removed the temp edit
-               _didResolveTempEdit = true;
 
-               context.pauseChangeDispatch();
+         function getAuth(o) {
+           return {
+             oauth_consumer_key: o.oauth_consumer_key,
+             oauth_signature_method: 'HMAC-SHA1'
+           };
+         } // potentially pre-authorize
 
-               var nextMode;
 
-               if (context.graph() === startGraph) { // we've undone back to the beginning
-                   nextMode = modeSelect(context, [wayID]);
-               } else {
-                   context.history()
-                       .on('undone.draw', null);
-                   // remove whatever segment was drawn previously
-                   context.undo();
+         oauth.options(o);
+         return oauth;
+       };
 
-                   if (context.graph() === startGraph) { // we've undone back to the beginning
-                       nextMode = modeSelect(context, [wayID]);
-                   } else {
-                       // continue drawing
-                       nextMode = mode;
-                   }
-               }
+       var JXON = new function () {
+         var sValueProp = 'keyValue',
+             sAttributesProp = 'keyAttributes',
+             sAttrPref = '@',
 
-               // clear the redo stack by adding and removing an edit
-               context.perform(actionNoop());
-               context.pop(1);
+         /* you can customize these values */
+         aCache = [],
+             rIsNull = /^\s*$/,
+             rIsBool = /^(?:true|false)$/i;
 
-               context.resumeChangeDispatch();
-               context.enter(nextMode);
+         function parseText(sValue) {
+           if (rIsNull.test(sValue)) {
+             return null;
            }
 
+           if (rIsBool.test(sValue)) {
+             return sValue.toLowerCase() === 'true';
+           }
 
-           function setActiveElements() {
-               if (!_drawNode) return;
+           if (isFinite(sValue)) {
+             return parseFloat(sValue);
+           }
 
-               context.surface().selectAll('.' + _drawNode.id)
-                   .classed('active', true);
+           if (isFinite(Date.parse(sValue))) {
+             return new Date(sValue);
            }
 
+           return sValue;
+         }
 
-           function resetToStartGraph() {
-               while (context.graph() !== startGraph) {
-                   context.pop();
-               }
-           }
+         function EmptyTree() {}
 
+         EmptyTree.prototype.toString = function () {
+           return 'null';
+         };
 
-           var drawWay = function(surface) {
-               _drawNode = undefined;
-               _didResolveTempEdit = false;
-               _origWay = context.entity(wayID);
-               _headNodeID = typeof _nodeIndex === 'number' ? _origWay.nodes[_nodeIndex] :
-                   (_origWay.isClosed() ? _origWay.nodes[_origWay.nodes.length - 2] : _origWay.nodes[_origWay.nodes.length - 1]);
-               _wayGeometry = _origWay.geometry(context.graph());
-               _annotation = _t((_origWay.isDegenerate() ?
-                   'operations.start.annotation.' :
-                   'operations.continue.annotation.') + _wayGeometry
-               );
-               _pointerHasMoved = false;
-
-               // Push an annotated state for undo to return back to.
-               // We must make sure to replace or remove it later.
-               context.pauseChangeDispatch();
-               context.perform(actionNoop(), _annotation);
-               context.resumeChangeDispatch();
-
-               behavior.hover()
-                   .initialNodeID(_headNodeID);
-
-               behavior
-                   .on('move', function() {
-                       _pointerHasMoved = true;
-                       move.apply(this, arguments);
-                   })
-                   .on('down', function() {
-                       move.apply(this, arguments);
-                   })
-                   .on('downcancel', function() {
-                       if (_drawNode) removeDrawNode();
-                   })
-                   .on('click', drawWay.add)
-                   .on('clickWay', drawWay.addWay)
-                   .on('clickNode', drawWay.addNode)
-                   .on('undo', context.undo)
-                   .on('cancel', drawWay.cancel)
-                   .on('finish', drawWay.finish);
-
-               select(window)
-                   .on('keydown.drawWay', keydown)
-                   .on('keyup.drawWay', keyup);
-
-               context.map()
-                   .dblclickZoomEnable(false)
-                   .on('drawn.draw', setActiveElements);
-
-               setActiveElements();
-
-               surface.call(behavior);
-
-               context.history()
-                   .on('undone.draw', undone);
-           };
+         EmptyTree.prototype.valueOf = function () {
+           return null;
+         };
 
+         function objectify(vValue) {
+           return vValue === null ? new EmptyTree() : vValue instanceof Object ? vValue : new vValue.constructor(vValue);
+         }
 
-           drawWay.off = function(surface) {
+         function createObjTree(oParentNode, nVerb, bFreeze, bNesteAttr) {
+           var nLevelStart = aCache.length,
+               bChildren = oParentNode.hasChildNodes(),
+               bAttributes = oParentNode.hasAttributes(),
+               bHighVerb = Boolean(nVerb & 2);
+           var sProp,
+               vContent,
+               nLength = 0,
+               sCollectedTxt = '',
+               vResult = bHighVerb ? {} :
+           /* put here the default value for empty nodes: */
+           true;
 
-               if (!_didResolveTempEdit) {
-                   // Drawing was interrupted unexpectedly.
-                   // This can happen if the user changes modes,
-                   // clicks geolocate button, a hashchange event occurs, etc.
+           if (bChildren) {
+             for (var oNode, nItem = 0; nItem < oParentNode.childNodes.length; nItem++) {
+               oNode = oParentNode.childNodes.item(nItem);
 
-                   context.pauseChangeDispatch();
-                   resetToStartGraph();
-                   context.resumeChangeDispatch();
+               if (oNode.nodeType === 4) {
+                 sCollectedTxt += oNode.nodeValue;
                }
+               /* nodeType is 'CDATASection' (4) */
+               else if (oNode.nodeType === 3) {
+                   sCollectedTxt += oNode.nodeValue.trim();
+                 }
+                 /* nodeType is 'Text' (3) */
+                 else if (oNode.nodeType === 1 && !oNode.prefix) {
+                     aCache.push(oNode);
+                   }
+               /* nodeType is 'Element' (1) */
 
-               _drawNode = undefined;
-               _nodeIndex = undefined;
+             }
+           }
 
-               context.map()
-                   .on('drawn.draw', null);
+           var nLevelEnd = aCache.length,
+               vBuiltVal = parseText(sCollectedTxt);
 
-               surface.call(behavior.off)
-                   .selectAll('.active')
-                   .classed('active', false);
+           if (!bHighVerb && (bChildren || bAttributes)) {
+             vResult = nVerb === 0 ? objectify(vBuiltVal) : {};
+           }
 
-               surface
-                   .classed('nope', false)
-                   .classed('nope-suppressed', false)
-                   .classed('nope-disabled', false);
+           for (var nElId = nLevelStart; nElId < nLevelEnd; nElId++) {
+             sProp = aCache[nElId].nodeName.toLowerCase();
+             vContent = createObjTree(aCache[nElId], nVerb, bFreeze, bNesteAttr);
 
-               select(window)
-                   .on('keydown.drawWay', null)
-                   .on('keyup.drawWay', null);
+             if (vResult.hasOwnProperty(sProp)) {
+               if (vResult[sProp].constructor !== Array) {
+                 vResult[sProp] = [vResult[sProp]];
+               }
 
-               context.history()
-                   .on('undone.draw', null);
-           };
+               vResult[sProp].push(vContent);
+             } else {
+               vResult[sProp] = vContent;
+               nLength++;
+             }
+           }
 
+           if (bAttributes) {
+             var nAttrLen = oParentNode.attributes.length,
+                 sAPrefix = bNesteAttr ? '' : sAttrPref,
+                 oAttrParent = bNesteAttr ? {} : vResult;
 
-           function attemptAdd(d, loc, doAdd) {
+             for (var oAttrib, nAttrib = 0; nAttrib < nAttrLen; nLength++, nAttrib++) {
+               oAttrib = oParentNode.attributes.item(nAttrib);
+               oAttrParent[sAPrefix + oAttrib.name.toLowerCase()] = parseText(oAttrib.value.trim());
+             }
 
-               if (_drawNode) {
-                   // move the node to the final loc in case move wasn't called
-                   // consistently (e.g. on touch devices)
-                   context.replace(actionMoveNode(_drawNode.id, loc), _annotation);
-                   _drawNode = context.entity(_drawNode.id);
-               } else {
-                   createDrawNode(loc);
+             if (bNesteAttr) {
+               if (bFreeze) {
+                 Object.freeze(oAttrParent);
                }
 
-               checkGeometry(true /* includeDrawNode */);
-               if ((d && d.properties && d.properties.nope) || context.surface().classed('nope')) {
-                   if (!_pointerHasMoved) {
-                       // prevent the temporary draw node from appearing on touch devices
-                       removeDrawNode();
-                   }
-                   dispatch$1.call('rejectedSelfIntersection', this);
-                   return;   // can't click here
-               }
+               vResult[sAttributesProp] = oAttrParent;
+               nLength -= nAttrLen - 1;
+             }
+           }
 
-               context.pauseChangeDispatch();
-               doAdd();
-               // we just replaced the temporary edit with the real one
-               _didResolveTempEdit = true;
-               context.resumeChangeDispatch();
+           if (nVerb === 3 || (nVerb === 2 || nVerb === 1 && nLength > 0) && sCollectedTxt) {
+             vResult[sValueProp] = vBuiltVal;
+           } else if (!bHighVerb && nLength === 0 && sCollectedTxt) {
+             vResult = vBuiltVal;
+           }
 
-               context.enter(mode);
+           if (bFreeze && (bHighVerb || nLength > 0)) {
+             Object.freeze(vResult);
            }
 
+           aCache.length = nLevelStart;
+           return vResult;
+         }
 
-           // Accept the current position of the drawing node
-           drawWay.add = function(loc, d) {
-               attemptAdd(d, loc, function() {
-                   // don't need to do anything extra
-               });
-           };
+         function loadObjTree(oXMLDoc, oParentEl, oParentObj) {
+           var vValue, oChild;
 
+           if (oParentObj instanceof String || oParentObj instanceof Number || oParentObj instanceof Boolean) {
+             oParentEl.appendChild(oXMLDoc.createTextNode(oParentObj.toString()));
+             /* verbosity level is 0 */
+           } else if (oParentObj.constructor === Date) {
+             oParentEl.appendChild(oXMLDoc.createTextNode(oParentObj.toGMTString()));
+           }
 
-           // Connect the way to an existing way
-           drawWay.addWay = function(loc, edge, d) {
-               attemptAdd(d, loc, function() {
-                   context.replace(
-                       actionAddMidpoint({ loc: loc, edge: edge }, _drawNode),
-                       _annotation
-                   );
-               });
-           };
+           for (var sName in oParentObj) {
+             vValue = oParentObj[sName];
 
+             if (isFinite(sName) || vValue instanceof Function) {
+               continue;
+             }
+             /* verbosity level is 0 */
 
-           // Connect the way to an existing node
-           drawWay.addNode = function(node, d) {
 
-               // finish drawing if the mapper targets the prior node
-               if (node.id === _headNodeID ||
-                   // or the first node when drawing an area
-                   (_origWay.isClosed() && node.id === _origWay.first())) {
-                   drawWay.finish();
-                   return;
+             if (sName === sValueProp) {
+               if (vValue !== null && vValue !== true) {
+                 oParentEl.appendChild(oXMLDoc.createTextNode(vValue.constructor === Date ? vValue.toGMTString() : String(vValue)));
+               }
+             } else if (sName === sAttributesProp) {
+               /* verbosity level is 3 */
+               for (var sAttrib in vValue) {
+                 oParentEl.setAttribute(sAttrib, vValue[sAttrib]);
+               }
+             } else if (sName.charAt(0) === sAttrPref) {
+               oParentEl.setAttribute(sName.slice(1), vValue);
+             } else if (vValue.constructor === Array) {
+               for (var nItem = 0; nItem < vValue.length; nItem++) {
+                 oChild = oXMLDoc.createElement(sName);
+                 loadObjTree(oXMLDoc, oChild, vValue[nItem]);
+                 oParentEl.appendChild(oChild);
                }
+             } else {
+               oChild = oXMLDoc.createElement(sName);
 
-               attemptAdd(d, node.loc, function() {
-                   context.replace(
-                       function actionReplaceDrawNode(graph) {
-                           // remove the temporary draw node and insert the existing node
-                           // at the same index
+               if (vValue instanceof Object) {
+                 loadObjTree(oXMLDoc, oChild, vValue);
+               } else if (vValue !== null && vValue !== true) {
+                 oChild.appendChild(oXMLDoc.createTextNode(vValue.toString()));
+               }
 
-                           graph = graph
-                               .replace(graph.entity(wayID).removeNode(_drawNode.id))
-                               .remove(_drawNode);
-                           return graph
-                               .replace(graph.entity(wayID).addNode(node.id, _nodeIndex));
-                       },
-                       _annotation
-                   );
-               });
-           };
+               oParentEl.appendChild(oChild);
+             }
+           }
+         }
 
+         this.build = function (oXMLParent, nVerbosity
+         /* optional */
+         , bFreeze
+         /* optional */
+         , bNesteAttributes
+         /* optional */
+         ) {
+           var _nVerb = arguments.length > 1 && typeof nVerbosity === 'number' ? nVerbosity & 3 :
+           /* put here the default verbosity level: */
+           1;
 
-           // Finish the draw operation, removing the temporary edit.
-           // If the way has enough nodes to be valid, it's selected.
-           // Otherwise, delete everything and return to browse mode.
-           drawWay.finish = function() {
-               checkGeometry(false /* includeDrawNode */);
-               if (context.surface().classed('nope')) {
-                   dispatch$1.call('rejectedSelfIntersection', this);
-                   return;   // can't click here
-               }
+           return createObjTree(oXMLParent, _nVerb, bFreeze || false, arguments.length > 3 ? bNesteAttributes : _nVerb === 3);
+         };
 
-               context.pauseChangeDispatch();
-               // remove the temporary edit
-               context.pop(1);
-               _didResolveTempEdit = true;
-               context.resumeChangeDispatch();
+         this.unbuild = function (oObjTree) {
+           var oNewDoc = document.implementation.createDocument('', '', null);
+           loadObjTree(oNewDoc, oNewDoc, oObjTree);
+           return oNewDoc;
+         };
 
-               var way = context.hasEntity(wayID);
-               if (!way || way.isDegenerate()) {
-                   drawWay.cancel();
-                   return;
-               }
+         this.stringify = function (oObjTree) {
+           return new XMLSerializer().serializeToString(JXON.unbuild(oObjTree));
+         };
+       }(); // var myObject = JXON.build(doc);
+       // we got our javascript object! try: alert(JSON.stringify(myObject));
+       // var newDoc = JXON.unbuild(myObject);
+       // we got our Document instance! try: alert((new XMLSerializer()).serializeToString(newDoc));
 
-               window.setTimeout(function() {
-                   context.map().dblclickZoomEnable(true);
-               }, 1000);
+       var tiler$5 = utilTiler();
+       var dispatch$6 = dispatch('apiStatusChange', 'authLoading', 'authDone', 'change', 'loading', 'loaded', 'loadedNotes');
+       var urlroot = 'https://www.openstreetmap.org';
+       var oauth = osmAuth({
+         url: urlroot,
+         oauth_consumer_key: '5A043yRSEugj4DJ5TljuapfnrflWDte8jTOcWLlT',
+         oauth_secret: 'aB3jKq1TRsCOUrfOIZ6oQMEDmv2ptV76PA54NGLL',
+         loading: authLoading,
+         done: authDone
+       }); // hardcode default block of Google Maps
+
+       var _imageryBlocklists = [/.*\.google(apis)?\..*\/(vt|kh)[\?\/].*([xyz]=.*){3}.*/];
+       var _tileCache = {
+         toLoad: {},
+         loaded: {},
+         inflight: {},
+         seen: {},
+         rtree: new RBush()
+       };
+       var _noteCache = {
+         toLoad: {},
+         loaded: {},
+         inflight: {},
+         inflightPost: {},
+         note: {},
+         closed: {},
+         rtree: new RBush()
+       };
+       var _userCache = {
+         toLoad: {},
+         user: {}
+       };
 
-               var isNewFeature = !mode.isContinuing;
-               context.enter(modeSelect(context, [wayID]).newFeature(isNewFeature));
-           };
+       var _cachedApiStatus;
 
+       var _changeset = {};
 
-           // Cancel the draw operation, delete everything, and return to browse mode.
-           drawWay.cancel = function() {
-               context.pauseChangeDispatch();
-               resetToStartGraph();
-               context.resumeChangeDispatch();
+       var _deferred = new Set();
 
-               window.setTimeout(function() {
-                   context.map().dblclickZoomEnable(true);
-               }, 1000);
+       var _connectionID = 1;
+       var _tileZoom$3 = 16;
+       var _noteZoom = 12;
 
-               context.surface()
-                   .classed('nope', false)
-                   .classed('nope-disabled', false)
-                   .classed('nope-suppressed', false);
+       var _rateLimitError;
 
-               context.enter(modeBrowse(context));
-           };
+       var _userChangesets;
 
+       var _userDetails;
 
-           drawWay.nodeIndex = function(val) {
-               if (!arguments.length) return _nodeIndex;
-               _nodeIndex = val;
-               return drawWay;
-           };
+       var _off; // set a default but also load this from the API status
 
 
-           drawWay.activeID = function() {
-               if (!arguments.length) return _drawNode && _drawNode.id;
-               // no assign
-               return drawWay;
-           };
+       var _maxWayNodes = 2000;
 
+       function authLoading() {
+         dispatch$6.call('authLoading');
+       }
 
-           return utilRebind(drawWay, dispatch$1, 'on');
+       function authDone() {
+         dispatch$6.call('authDone');
        }
 
-       function modeDrawLine(context, wayID, startGraph, button, affix, continuing) {
-           var mode = {
-               button: button,
-               id: 'draw-line'
-           };
+       function abortRequest$5(controllerOrXHR) {
+         if (controllerOrXHR) {
+           controllerOrXHR.abort();
+         }
+       }
 
-           var behavior = behaviorDrawWay(context, wayID, mode, startGraph)
-               .on('rejectedSelfIntersection.modeDrawLine', function() {
-                   context.ui().flash
-                       .text(_t('self_intersection.error.lines'))();
-               });
+       function hasInflightRequests(cache) {
+         return Object.keys(cache.inflight).length;
+       }
 
-           mode.wayID = wayID;
+       function abortUnwantedRequests$3(cache, visibleTiles) {
+         Object.keys(cache.inflight).forEach(function (k) {
+           if (cache.toLoad[k]) return;
+           if (visibleTiles.find(function (tile) {
+             return k === tile.id;
+           })) return;
+           abortRequest$5(cache.inflight[k]);
+           delete cache.inflight[k];
+         });
+       }
 
-           mode.isContinuing = continuing;
+       function getLoc(attrs) {
+         var lon = attrs.lon && attrs.lon.value;
+         var lat = attrs.lat && attrs.lat.value;
+         return [parseFloat(lon), parseFloat(lat)];
+       }
 
-           mode.enter = function() {
-               behavior
-                   .nodeIndex(affix === 'prefix' ? 0 : undefined);
+       function getNodes(obj) {
+         var elems = obj.getElementsByTagName('nd');
+         var nodes = new Array(elems.length);
 
-               context.install(behavior);
-           };
+         for (var i = 0, l = elems.length; i < l; i++) {
+           nodes[i] = 'n' + elems[i].attributes.ref.value;
+         }
 
-           mode.exit = function() {
-               context.uninstall(behavior);
-           };
+         return nodes;
+       }
 
-           mode.selectedIDs = function() {
-               return [wayID];
-           };
+       function getNodesJSON(obj) {
+         var elems = obj.nodes;
+         var nodes = new Array(elems.length);
 
-           mode.activeID = function() {
-               return (behavior && behavior.activeID()) || [];
-           };
+         for (var i = 0, l = elems.length; i < l; i++) {
+           nodes[i] = 'n' + elems[i];
+         }
 
-           return mode;
+         return nodes;
        }
 
-       function operationContinue(context, selectedIDs) {
-           var graph = context.graph();
-           var entities = selectedIDs.map(function(id) { return graph.entity(id); });
-           var geometries = Object.assign(
-               { line: [], vertex: [] },
-               utilArrayGroupBy(entities, function(entity) { return entity.geometry(graph); })
-           );
-           var vertex = geometries.vertex[0];
+       function getTags(obj) {
+         var elems = obj.getElementsByTagName('tag');
+         var tags = {};
 
+         for (var i = 0, l = elems.length; i < l; i++) {
+           var attrs = elems[i].attributes;
+           tags[attrs.k.value] = attrs.v.value;
+         }
 
-           function candidateWays() {
-               return graph.parentWays(vertex).filter(function(parent) {
-                   return parent.geometry(graph) === 'line' &&
-                       !parent.isClosed() &&
-                       parent.affix(vertex.id) &&
-                       (geometries.line.length === 0 || geometries.line[0] === parent);
-               });
-           }
+         return tags;
+       }
 
+       function getMembers(obj) {
+         var elems = obj.getElementsByTagName('member');
+         var members = new Array(elems.length);
 
-           var operation = function() {
-               var candidate = candidateWays()[0];
-               context.enter(
-                   modeDrawLine(context, candidate.id, context.graph(), 'line', candidate.affix(vertex.id), true)
-               );
+         for (var i = 0, l = elems.length; i < l; i++) {
+           var attrs = elems[i].attributes;
+           members[i] = {
+             id: attrs.type.value[0] + attrs.ref.value,
+             type: attrs.type.value,
+             role: attrs.role.value
            };
+         }
+
+         return members;
+       }
 
+       function getMembersJSON(obj) {
+         var elems = obj.members;
+         var members = new Array(elems.length);
 
-           operation.available = function() {
-               return geometries.vertex.length === 1 &&
-                   geometries.line.length <= 1 &&
-                   !context.features().hasHiddenConnections(vertex, context.graph());
+         for (var i = 0, l = elems.length; i < l; i++) {
+           var attrs = elems[i];
+           members[i] = {
+             id: attrs.type[0] + attrs.ref,
+             type: attrs.type,
+             role: attrs.role
            };
+         }
 
+         return members;
+       }
 
-           operation.disabled = function() {
-               var candidates = candidateWays();
-               if (candidates.length === 0) {
-                   return 'not_eligible';
-               } else if (candidates.length > 1) {
-                   return 'multiple';
-               }
+       function getVisible(attrs) {
+         return !attrs.visible || attrs.visible.value !== 'false';
+       }
 
-               return false;
-           };
+       function parseComments(comments) {
+         var parsedComments = []; // for each comment
 
+         for (var i = 0; i < comments.length; i++) {
+           var comment = comments[i];
 
-           operation.tooltip = function() {
-               var disable = operation.disabled();
-               return disable ?
-                   _t('operations.continue.' + disable) :
-                   _t('operations.continue.description');
-           };
+           if (comment.nodeName === 'comment') {
+             var childNodes = comment.childNodes;
+             var parsedComment = {};
 
+             for (var j = 0; j < childNodes.length; j++) {
+               var node = childNodes[j];
+               var nodeName = node.nodeName;
+               if (nodeName === '#text') continue;
+               parsedComment[nodeName] = node.textContent;
 
-           operation.annotation = function() {
-               return _t('operations.continue.annotation.line');
-           };
+               if (nodeName === 'uid') {
+                 var uid = node.textContent;
 
+                 if (uid && !_userCache.user[uid]) {
+                   _userCache.toLoad[uid] = true;
+                 }
+               }
+             }
 
-           operation.id = 'continue';
-           operation.keys = [_t('operations.continue.key')];
-           operation.title = _t('operations.continue.title');
-           operation.behavior = behaviorOperation(context).which(operation);
+             if (parsedComment) {
+               parsedComments.push(parsedComment);
+             }
+           }
+         }
 
-           return operation;
+         return parsedComments;
        }
 
-       function operationCopy(context, selectedIDs) {
-
-           var _multi = selectedIDs.length === 1 ? 'single' : 'multiple';
+       function encodeNoteRtree(note) {
+         return {
+           minX: note.loc[0],
+           minY: note.loc[1],
+           maxX: note.loc[0],
+           maxY: note.loc[1],
+           data: note
+         };
+       }
 
-           function getFilteredIdsToCopy() {
-               return selectedIDs.filter(function(selectedID) {
-                   var entity = context.graph().hasEntity(selectedID);
-                   // don't copy untagged vertices separately from ways
-                   return entity.hasInterestingTags() || entity.geometry(context.graph()) !== 'vertex';
-               });
-           }
+       var jsonparsers = {
+         node: function nodeData(obj, uid) {
+           return new osmNode({
+             id: uid,
+             visible: typeof obj.visible === 'boolean' ? obj.visible : true,
+             version: obj.version && obj.version.toString(),
+             changeset: obj.changeset && obj.changeset.toString(),
+             timestamp: obj.timestamp,
+             user: obj.user,
+             uid: obj.uid && obj.uid.toString(),
+             loc: [parseFloat(obj.lon), parseFloat(obj.lat)],
+             tags: obj.tags
+           });
+         },
+         way: function wayData(obj, uid) {
+           return new osmWay({
+             id: uid,
+             visible: typeof obj.visible === 'boolean' ? obj.visible : true,
+             version: obj.version && obj.version.toString(),
+             changeset: obj.changeset && obj.changeset.toString(),
+             timestamp: obj.timestamp,
+             user: obj.user,
+             uid: obj.uid && obj.uid.toString(),
+             tags: obj.tags,
+             nodes: getNodesJSON(obj)
+           });
+         },
+         relation: function relationData(obj, uid) {
+           return new osmRelation({
+             id: uid,
+             visible: typeof obj.visible === 'boolean' ? obj.visible : true,
+             version: obj.version && obj.version.toString(),
+             changeset: obj.changeset && obj.changeset.toString(),
+             timestamp: obj.timestamp,
+             user: obj.user,
+             uid: obj.uid && obj.uid.toString(),
+             tags: obj.tags,
+             members: getMembersJSON(obj)
+           });
+         }
+       };
 
-           var operation = function() {
+       function parseJSON(payload, callback, options) {
+         options = Object.assign({
+           skipSeen: true
+         }, options);
+
+         if (!payload) {
+           return callback({
+             message: 'No JSON',
+             status: -1
+           });
+         }
 
-               if (!getSelectionText()) {
-                   event.preventDefault();
-               }
+         var json = payload;
+         if (_typeof(json) !== 'object') json = JSON.parse(payload);
+         if (!json.elements) return callback({
+           message: 'No JSON',
+           status: -1
+         });
+         var children = json.elements;
+         var handle = window.requestIdleCallback(function () {
+           var results = [];
+           var result;
 
-               var graph = context.graph();
-               var selected = groupEntities(getFilteredIdsToCopy(), graph);
-               var canCopy = [];
-               var skip = {};
-               var entity;
-               var i;
+           for (var i = 0; i < children.length; i++) {
+             result = parseChild(children[i]);
+             if (result) results.push(result);
+           }
 
-               for (i = 0; i < selected.relation.length; i++) {
-                   entity = selected.relation[i];
-                   if (!skip[entity.id] && entity.isComplete(graph)) {
-                       canCopy.push(entity.id);
-                       skip = getDescendants(entity.id, graph, skip);
-                   }
-               }
-               for (i = 0; i < selected.way.length; i++) {
-                   entity = selected.way[i];
-                   if (!skip[entity.id]) {
-                       canCopy.push(entity.id);
-                       skip = getDescendants(entity.id, graph, skip);
-                   }
-               }
-               for (i = 0; i < selected.node.length; i++) {
-                   entity = selected.node[i];
-                   if (!skip[entity.id]) {
-                       canCopy.push(entity.id);
-                   }
-               }
+           callback(null, results);
+         });
 
-               context.copyIDs(canCopy);
-               if (_point &&
-                   (canCopy.length !== 1 || graph.entity(canCopy[0]).type !== 'node')) {
-                   // store the anchor coordinates if copying more than a single node
-                   context.copyLonLat(context.projection.invert(_point));
-               } else {
-                   context.copyLonLat(null);
-               }
+         _deferred.add(handle);
 
-           };
+         function parseChild(child) {
+           var parser = jsonparsers[child.type];
+           if (!parser) return null;
+           var uid;
+           uid = osmEntity.id.fromOSM(child.type, child.id);
 
+           if (options.skipSeen) {
+             if (_tileCache.seen[uid]) return null; // avoid reparsing a "seen" entity
 
-           function groupEntities(ids, graph) {
-               var entities = ids.map(function (id) { return graph.entity(id); });
-               return Object.assign(
-                   { relation: [], way: [], node: [] },
-                   utilArrayGroupBy(entities, 'type')
-               );
+             _tileCache.seen[uid] = true;
            }
 
+           return parser(child, uid);
+         }
+       }
 
-           function getDescendants(id, graph, descendants) {
-               var entity = graph.entity(id);
-               var children;
+       var parsers = {
+         node: function nodeData(obj, uid) {
+           var attrs = obj.attributes;
+           return new osmNode({
+             id: uid,
+             visible: getVisible(attrs),
+             version: attrs.version.value,
+             changeset: attrs.changeset && attrs.changeset.value,
+             timestamp: attrs.timestamp && attrs.timestamp.value,
+             user: attrs.user && attrs.user.value,
+             uid: attrs.uid && attrs.uid.value,
+             loc: getLoc(attrs),
+             tags: getTags(obj)
+           });
+         },
+         way: function wayData(obj, uid) {
+           var attrs = obj.attributes;
+           return new osmWay({
+             id: uid,
+             visible: getVisible(attrs),
+             version: attrs.version.value,
+             changeset: attrs.changeset && attrs.changeset.value,
+             timestamp: attrs.timestamp && attrs.timestamp.value,
+             user: attrs.user && attrs.user.value,
+             uid: attrs.uid && attrs.uid.value,
+             tags: getTags(obj),
+             nodes: getNodes(obj)
+           });
+         },
+         relation: function relationData(obj, uid) {
+           var attrs = obj.attributes;
+           return new osmRelation({
+             id: uid,
+             visible: getVisible(attrs),
+             version: attrs.version.value,
+             changeset: attrs.changeset && attrs.changeset.value,
+             timestamp: attrs.timestamp && attrs.timestamp.value,
+             user: attrs.user && attrs.user.value,
+             uid: attrs.uid && attrs.uid.value,
+             tags: getTags(obj),
+             members: getMembers(obj)
+           });
+         },
+         note: function parseNote(obj, uid) {
+           var attrs = obj.attributes;
+           var childNodes = obj.childNodes;
+           var props = {};
+           props.id = uid;
+           props.loc = getLoc(attrs); // if notes are coincident, move them apart slightly
 
-               descendants = descendants || {};
+           var coincident = false;
+           var epsilon = 0.00001;
 
-               if (entity.type === 'relation') {
-                   children = entity.members.map(function(m) { return m.id; });
-               } else if (entity.type === 'way') {
-                   children = entity.nodes;
-               } else {
-                   children = [];
-               }
+           do {
+             if (coincident) {
+               props.loc = geoVecAdd(props.loc, [epsilon, epsilon]);
+             }
 
-               for (var i = 0; i < children.length; i++) {
-                   if (!descendants[children[i]]) {
-                       descendants[children[i]] = true;
-                       descendants = getDescendants(children[i], graph, descendants);
-                   }
-               }
+             var bbox = geoExtent(props.loc).bbox();
+             coincident = _noteCache.rtree.search(bbox).length;
+           } while (coincident); // parse note contents
 
-               return descendants;
-           }
 
+           for (var i = 0; i < childNodes.length; i++) {
+             var node = childNodes[i];
+             var nodeName = node.nodeName;
+             if (nodeName === '#text') continue; // if the element is comments, parse the comments
 
-           function getSelectionText() {
-               return window.getSelection().toString();
+             if (nodeName === 'comments') {
+               props[nodeName] = parseComments(node.childNodes);
+             } else {
+               props[nodeName] = node.textContent;
+             }
            }
 
+           var note = new osmNote(props);
+           var item = encodeNoteRtree(note);
+           _noteCache.note[note.id] = note;
 
-           operation.available = function() {
-               return getFilteredIdsToCopy().length > 0;
-           };
-
-
-           operation.disabled = function() {
-               var extent = utilTotalExtent(getFilteredIdsToCopy(), context.graph());
-               if (extent.percentContainedIn(context.map().extent()) < 0.8) {
-                   return 'too_large';
-               }
-               return false;
-           };
-
+           _noteCache.rtree.insert(item);
 
-           operation.tooltip = function() {
-               var disable = operation.disabled();
-               return disable ?
-                   _t('operations.copy.' + disable + '.' + _multi) :
-                   _t('operations.copy.description' + '.' + _multi);
+           return note;
+         },
+         user: function parseUser(obj, uid) {
+           var attrs = obj.attributes;
+           var user = {
+             id: uid,
+             display_name: attrs.display_name && attrs.display_name.value,
+             account_created: attrs.account_created && attrs.account_created.value,
+             changesets_count: '0',
+             active_blocks: '0'
            };
+           var img = obj.getElementsByTagName('img');
 
+           if (img && img[0] && img[0].getAttribute('href')) {
+             user.image_url = img[0].getAttribute('href');
+           }
 
-           operation.annotation = function() {
-               return selectedIDs.length === 1 ?
-                   _t('operations.copy.annotation.single') :
-                   _t('operations.copy.annotation.multiple', { n: selectedIDs.length.toString() });
-           };
-
+           var changesets = obj.getElementsByTagName('changesets');
 
-           var _point;
-           operation.point = function(val) {
-               _point = val;
-               return operation;
-           };
+           if (changesets && changesets[0] && changesets[0].getAttribute('count')) {
+             user.changesets_count = changesets[0].getAttribute('count');
+           }
 
+           var blocks = obj.getElementsByTagName('blocks');
 
-           operation.id = 'copy';
-           operation.keys = [uiCmd('⌘C')];
-           operation.title = _t('operations.copy.title');
-           operation.behavior = behaviorOperation(context).which(operation);
+           if (blocks && blocks[0]) {
+             var received = blocks[0].getElementsByTagName('received');
 
-           return operation;
-       }
+             if (received && received[0] && received[0].getAttribute('active')) {
+               user.active_blocks = received[0].getAttribute('active');
+             }
+           }
 
-       function operationDisconnect(context, selectedIDs) {
-           var _vertexIDs = [];
-           var _wayIDs = [];
-           var _otherIDs = [];
-           var _actions = [];
+           _userCache.user[uid] = user;
+           delete _userCache.toLoad[uid];
+           return user;
+         }
+       };
 
-           selectedIDs.forEach(function(id) {
-               var entity = context.entity(id);
-               if (entity.type === 'way'){
-                   _wayIDs.push(id);
-               } else if (entity.geometry(context.graph()) === 'vertex') {
-                   _vertexIDs.push(id);
-               } else {
-                   _otherIDs.push(id);
-               }
+       function parseXML(xml, callback, options) {
+         options = Object.assign({
+           skipSeen: true
+         }, options);
+
+         if (!xml || !xml.childNodes) {
+           return callback({
+             message: 'No XML',
+             status: -1
            });
+         }
 
-           var _extent, _nodes, _coords, _descriptionID = '', _annotationID = 'features';
-
-           if (_vertexIDs.length > 0) {
-               // At the selected vertices, disconnect the selected ways, if any, else
-               // disconnect all connected ways
-
-               _extent = utilTotalExtent(_vertexIDs, context.graph());
+         var root = xml.childNodes[0];
+         var children = root.childNodes;
+         var handle = window.requestIdleCallback(function () {
+           var results = [];
+           var result;
 
-               _vertexIDs.forEach(function(vertexID) {
-                   var action = actionDisconnect(vertexID);
+           for (var i = 0; i < children.length; i++) {
+             result = parseChild(children[i]);
+             if (result) results.push(result);
+           }
 
-                   if (_wayIDs.length > 0) {
-                       var waysIDsForVertex = _wayIDs.filter(function(wayID) {
-                           var way = context.entity(wayID);
-                           return way.nodes.indexOf(vertexID) !== -1;
-                       });
-                       action.limitWays(waysIDsForVertex);
-                   }
-                   _actions.push(action);
-               });
+           callback(null, results);
+         });
 
-               _descriptionID += _actions.length === 1 ? 'single_point.' : 'multiple_points.';
-               if (_wayIDs.length === 1) {
-                   _descriptionID += 'single_way.' + context.graph().geometry(_wayIDs[0]);
-               } else {
-                   _descriptionID += _wayIDs.length === 0 ? 'no_ways' : 'multiple_ways';
-               }
+         _deferred.add(handle);
 
-           } else if (_wayIDs.length > 0) {
-               // Disconnect the selected ways from each other, if they're connected,
-               // else disconnect them from all connected ways
+         function parseChild(child) {
+           var parser = parsers[child.nodeName];
+           if (!parser) return null;
+           var uid;
 
-               var ways = _wayIDs.map(function(id) {
-                   return context.entity(id);
-               });
-               _nodes = utilGetAllNodes(_wayIDs, context.graph());
-               _coords = _nodes.map(function(n) { return n.loc; });
-               _extent = utilTotalExtent(ways, context.graph());
-
-               // actions for connected nodes shared by at least two selected ways
-               var sharedActions = [];
-               // actions for connected nodes
-               var unsharedActions = [];
-
-               _nodes.forEach(function(node) {
-                   var action = actionDisconnect(node.id).limitWays(_wayIDs);
-                   if (action.disabled(context.graph()) !== 'not_connected') {
-
-                       var count = 0;
-                       for (var i in ways) {
-                           var way = ways[i];
-                           if (way.nodes.indexOf(node.id) !== -1) {
-                               count += 1;
-                           }
-                           if (count > 1) break;
-                       }
+           if (child.nodeName === 'user') {
+             uid = child.attributes.id.value;
 
-                       if (count > 1) {
-                           sharedActions.push(action);
-                       } else {
-                           unsharedActions.push(action);
-                       }
-                   }
-               });
+             if (options.skipSeen && _userCache.user[uid]) {
+               delete _userCache.toLoad[uid];
+               return null;
+             }
+           } else if (child.nodeName === 'note') {
+             uid = child.getElementsByTagName('id')[0].textContent;
+           } else {
+             uid = osmEntity.id.fromOSM(child.nodeName, child.attributes.id.value);
 
-               _descriptionID += 'no_points.';
-               _descriptionID += _wayIDs.length === 1 ? 'single_way.' : 'multiple_ways.';
+             if (options.skipSeen) {
+               if (_tileCache.seen[uid]) return null; // avoid reparsing a "seen" entity
 
-               if (sharedActions.length) {
-                   // if any nodes are shared, only disconnect the selected ways from each other
-                   _actions = sharedActions;
-                   _descriptionID += 'conjoined';
-                   _annotationID = 'from_each_other';
-               } else {
-                   // if no nodes are shared, disconnect the selected ways from all connected ways
-                   _actions = unsharedActions;
-                   if (_wayIDs.length === 1) {
-                       _descriptionID += context.graph().geometry(_wayIDs[0]);
-                   } else {
-                       _descriptionID += 'separate';
-                   }
-               }
+               _tileCache.seen[uid] = true;
+             }
            }
 
+           return parser(child, uid);
+         }
+       } // replace or remove note from rtree
 
-           var operation = function() {
-               context.perform(function(graph) {
-                   return _actions.reduce(function(graph, action) { return action(graph); }, graph);
-               }, operation.annotation());
 
-               context.validator().validate();
-           };
+       function updateRtree$3(item, replace) {
+         _noteCache.rtree.remove(item, function isEql(a, b) {
+           return a.data.id === b.data.id;
+         });
 
+         if (replace) {
+           _noteCache.rtree.insert(item);
+         }
+       }
 
-           operation.available = function() {
-               if (_actions.length === 0) return false;
-               if (_otherIDs.length !== 0) return false;
+       function wrapcb(thisArg, callback, cid) {
+         return function (err, result) {
+           if (err) {
+             // 400 Bad Request, 401 Unauthorized, 403 Forbidden..
+             if (err.status === 400 || err.status === 401 || err.status === 403) {
+               thisArg.logout();
+             }
+
+             return callback.call(thisArg, err);
+           } else if (thisArg.getConnectionId() !== cid) {
+             return callback.call(thisArg, {
+               message: 'Connection Switched',
+               status: -1
+             });
+           } else {
+             return callback.call(thisArg, err, result);
+           }
+         };
+       }
 
-               if (_vertexIDs.length !== 0 && _wayIDs.length !== 0 && !_wayIDs.every(function(wayID) {
-                   return _vertexIDs.some(function(vertexID) {
-                       var way = context.entity(wayID);
-                       return way.nodes.indexOf(vertexID) !== -1;
-                   });
-               })) return false;
+       var serviceOsm = {
+         init: function init() {
+           utilRebind(this, dispatch$6, 'on');
+         },
+         reset: function reset() {
+           Array.from(_deferred).forEach(function (handle) {
+             window.cancelIdleCallback(handle);
 
-               return true;
+             _deferred["delete"](handle);
+           });
+           _connectionID++;
+           _userChangesets = undefined;
+           _userDetails = undefined;
+           _rateLimitError = undefined;
+           Object.values(_tileCache.inflight).forEach(abortRequest$5);
+           Object.values(_noteCache.inflight).forEach(abortRequest$5);
+           Object.values(_noteCache.inflightPost).forEach(abortRequest$5);
+           if (_changeset.inflight) abortRequest$5(_changeset.inflight);
+           _tileCache = {
+             toLoad: {},
+             loaded: {},
+             inflight: {},
+             seen: {},
+             rtree: new RBush()
            };
+           _noteCache = {
+             toLoad: {},
+             loaded: {},
+             inflight: {},
+             inflightPost: {},
+             note: {},
+             closed: {},
+             rtree: new RBush()
+           };
+           _userCache = {
+             toLoad: {},
+             user: {}
+           };
+           _cachedApiStatus = undefined;
+           _changeset = {};
+           return this;
+         },
+         getConnectionId: function getConnectionId() {
+           return _connectionID;
+         },
+         changesetURL: function changesetURL(changesetID) {
+           return urlroot + '/changeset/' + changesetID;
+         },
+         changesetsURL: function changesetsURL(center, zoom) {
+           var precision = Math.max(0, Math.ceil(Math.log(zoom) / Math.LN2));
+           return urlroot + '/history#map=' + Math.floor(zoom) + '/' + center[1].toFixed(precision) + '/' + center[0].toFixed(precision);
+         },
+         entityURL: function entityURL(entity) {
+           return urlroot + '/' + entity.type + '/' + entity.osmId();
+         },
+         historyURL: function historyURL(entity) {
+           return urlroot + '/' + entity.type + '/' + entity.osmId() + '/history';
+         },
+         userURL: function userURL(username) {
+           return urlroot + '/user/' + username;
+         },
+         noteURL: function noteURL(note) {
+           return urlroot + '/note/' + note.id;
+         },
+         noteReportURL: function noteReportURL(note) {
+           return urlroot + '/reports/new?reportable_type=Note&reportable_id=' + note.id;
+         },
+         // Generic method to load data from the OSM API
+         // Can handle either auth or unauth calls.
+         loadFromAPI: function loadFromAPI(path, callback, options) {
+           options = Object.assign({
+             skipSeen: true
+           }, options);
+           var that = this;
+           var cid = _connectionID;
+
+           function done(err, payload) {
+             if (that.getConnectionId() !== cid) {
+               if (callback) callback({
+                 message: 'Connection Switched',
+                 status: -1
+               });
+               return;
+             }
 
+             var isAuthenticated = that.authenticated(); // 400 Bad Request, 401 Unauthorized, 403 Forbidden
+             // Logout and retry the request..
 
-           operation.disabled = function() {
-               var reason;
-               for (var actionIndex in _actions) {
-                   reason = _actions[actionIndex].disabled(context.graph());
-                   if (reason) return reason;
-               }
-
-               if (_extent && _extent.percentContainedIn(context.map().extent()) < 0.8) {
-                   return 'too_large.' + ((_vertexIDs.length ? _vertexIDs : _wayIDs).length === 1 ? 'single' : 'multiple');
-               } else if (_coords && someMissing()) {
-                   return 'not_downloaded';
-               } else if (selectedIDs.some(context.hasHiddenConnections)) {
-                   return 'connected_to_hidden';
-               }
-
-               return false;
-
-
-               function someMissing() {
-                   if (context.inIntro()) return false;
-                   var osm = context.connection();
-                   if (osm) {
-                       var missing = _coords.filter(function(loc) { return !osm.isDataLoaded(loc); });
-                       if (missing.length) {
-                           missing.forEach(function(loc) { context.loadTileAtLoc(loc); });
-                           return true;
-                       }
+             if (isAuthenticated && err && err.status && (err.status === 400 || err.status === 401 || err.status === 403)) {
+               that.logout();
+               that.loadFromAPI(path, callback, options); // else, no retry..
+             } else {
+               // 509 Bandwidth Limit Exceeded, 429 Too Many Requests
+               // Set the rateLimitError flag and trigger a warning..
+               if (!isAuthenticated && !_rateLimitError && err && err.status && (err.status === 509 || err.status === 429)) {
+                 _rateLimitError = err;
+                 dispatch$6.call('change');
+                 that.reloadApiStatus();
+               } else if (err && _cachedApiStatus === 'online' || !err && _cachedApiStatus !== 'online') {
+                 // If the response's error state doesn't match the status,
+                 // it's likely we lost or gained the connection so reload the status
+                 that.reloadApiStatus();
+               }
+
+               if (callback) {
+                 if (err) {
+                   return callback(err);
+                 } else {
+                   if (path.indexOf('.json') !== -1) {
+                     return parseJSON(payload, callback, options);
+                   } else {
+                     return parseXML(payload, callback, options);
                    }
-                   return false;
+                 }
                }
-           };
-
+             }
+           }
 
-           operation.tooltip = function() {
-               var disable = operation.disabled();
-               if (disable) {
-                   return _t('operations.disconnect.' + disable);
+           if (this.authenticated()) {
+             return oauth.xhr({
+               method: 'GET',
+               path: path
+             }, done);
+           } else {
+             var url = urlroot + path;
+             var controller = new AbortController();
+             d3_json(url, {
+               signal: controller.signal
+             }).then(function (data) {
+               done(null, data);
+             })["catch"](function (err) {
+               if (err.name === 'AbortError') return; // d3-fetch includes status in the error message,
+               // but we can't access the response itself
+               // https://github.com/d3/d3-fetch/issues/27
+
+               var match = err.message.match(/^\d{3}/);
+
+               if (match) {
+                 done({
+                   status: +match[0],
+                   statusText: err.message
+                 });
+               } else {
+                 done(err.message);
                }
-               return _t('operations.disconnect.description.' + _descriptionID);
+             });
+             return controller;
+           }
+         },
+         // Load a single entity by id (ways and relations use the `/full` call)
+         // GET /api/0.6/node/#id
+         // GET /api/0.6/[way|relation]/#id/full
+         loadEntity: function loadEntity(id, callback) {
+           var type = osmEntity.id.type(id);
+           var osmID = osmEntity.id.toOSM(id);
+           var options = {
+             skipSeen: false
            };
-
-
-           operation.annotation = function() {
-               return _t('operations.disconnect.annotation.' + _annotationID);
+           this.loadFromAPI('/api/0.6/' + type + '/' + osmID + (type !== 'node' ? '/full' : '') + '.json', function (err, entities) {
+             if (callback) callback(err, {
+               data: entities
+             });
+           }, options);
+         },
+         // Load a single entity with a specific version
+         // GET /api/0.6/[node|way|relation]/#id/#version
+         loadEntityVersion: function loadEntityVersion(id, version, callback) {
+           var type = osmEntity.id.type(id);
+           var osmID = osmEntity.id.toOSM(id);
+           var options = {
+             skipSeen: false
            };
+           this.loadFromAPI('/api/0.6/' + type + '/' + osmID + '/' + version + '.json', function (err, entities) {
+             if (callback) callback(err, {
+               data: entities
+             });
+           }, options);
+         },
+         // Load multiple entities in chunks
+         // (note: callback may be called multiple times)
+         // Unlike `loadEntity`, child nodes and members are not fetched
+         // GET /api/0.6/[nodes|ways|relations]?#parameters
+         loadMultiple: function loadMultiple(ids, callback) {
+           var that = this;
+           var groups = utilArrayGroupBy(utilArrayUniq(ids), osmEntity.id.type);
+           Object.keys(groups).forEach(function (k) {
+             var type = k + 's'; // nodes, ways, relations
+
+             var osmIDs = groups[k].map(function (id) {
+               return osmEntity.id.toOSM(id);
+             });
+             var options = {
+               skipSeen: false
+             };
+             utilArrayChunk(osmIDs, 150).forEach(function (arr) {
+               that.loadFromAPI('/api/0.6/' + type + '.json?' + type + '=' + arr.join(), function (err, entities) {
+                 if (callback) callback(err, {
+                   data: entities
+                 });
+               }, options);
+             });
+           });
+         },
+         // Create, upload, and close a changeset
+         // PUT /api/0.6/changeset/create
+         // POST /api/0.6/changeset/#id/upload
+         // PUT /api/0.6/changeset/#id/close
+         putChangeset: function putChangeset(changeset, changes, callback) {
+           var cid = _connectionID;
+
+           if (_changeset.inflight) {
+             return callback({
+               message: 'Changeset already inflight',
+               status: -2
+             }, changeset);
+           } else if (_changeset.open) {
+             // reuse existing open changeset..
+             return createdChangeset.call(this, null, _changeset.open);
+           } else {
+             // Open a new changeset..
+             var options = {
+               method: 'PUT',
+               path: '/api/0.6/changeset/create',
+               options: {
+                 header: {
+                   'Content-Type': 'text/xml'
+                 }
+               },
+               content: JXON.stringify(changeset.asJXON())
+             };
+             _changeset.inflight = oauth.xhr(options, wrapcb(this, createdChangeset, cid));
+           }
 
+           function createdChangeset(err, changesetID) {
+             _changeset.inflight = null;
 
-           operation.id = 'disconnect';
-           operation.keys = [_t('operations.disconnect.key')];
-           operation.title = _t('operations.disconnect.title');
-           operation.behavior = behaviorOperation(context).which(operation);
+             if (err) {
+               return callback(err, changeset);
+             }
 
-           return operation;
-       }
+             _changeset.open = changesetID;
+             changeset = changeset.update({
+               id: changesetID
+             }); // Upload the changeset..
 
-       function operationDowngrade(context, selectedIDs) {
-           var affectedFeatureCount = 0;
-           var downgradeType;
+             var options = {
+               method: 'POST',
+               path: '/api/0.6/changeset/' + changesetID + '/upload',
+               options: {
+                 header: {
+                   'Content-Type': 'text/xml'
+                 }
+               },
+               content: JXON.stringify(changeset.osmChangeJXON(changes))
+             };
+             _changeset.inflight = oauth.xhr(options, wrapcb(this, uploadedChangeset, cid));
+           }
 
-           setDowngradeTypeForEntityIDs();
+           function uploadedChangeset(err) {
+             _changeset.inflight = null;
+             if (err) return callback(err, changeset); // Upload was successful, safe to call the callback.
+             // Add delay to allow for postgres replication #1646 #2678
 
-           var multi = affectedFeatureCount === 1 ? 'single' : 'multiple';
+             window.setTimeout(function () {
+               callback(null, changeset);
+             }, 2500);
+             _changeset.open = null; // At this point, we don't really care if the connection was switched..
+             // Only try to close the changeset if we're still talking to the same server.
 
-           function setDowngradeTypeForEntityIDs() {
-               for (var i in selectedIDs) {
-                   var entityID = selectedIDs[i];
-                   var type = downgradeTypeForEntityID(entityID);
-                   if (type) {
-                       affectedFeatureCount += 1;
-                       if (downgradeType && type !== downgradeType) {
-                           downgradeType = 'building_address';
-                       } else {
-                           downgradeType = type;
-                       }
+             if (this.getConnectionId() === cid) {
+               // Still attempt to close changeset, but ignore response because #2667
+               oauth.xhr({
+                 method: 'PUT',
+                 path: '/api/0.6/changeset/' + changeset.id + '/close',
+                 options: {
+                   header: {
+                     'Content-Type': 'text/xml'
                    }
-               }
+                 }
+               }, function () {
+                 return true;
+               });
+             }
            }
+         },
+         // Load multiple users in chunks
+         // (note: callback may be called multiple times)
+         // GET /api/0.6/users?users=#id1,#id2,...,#idn
+         loadUsers: function loadUsers(uids, callback) {
+           var toLoad = [];
+           var cached = [];
+           utilArrayUniq(uids).forEach(function (uid) {
+             if (_userCache.user[uid]) {
+               delete _userCache.toLoad[uid];
+               cached.push(_userCache.user[uid]);
+             } else {
+               toLoad.push(uid);
+             }
+           });
 
-           function downgradeTypeForEntityID(entityID) {
-               var graph = context.graph();
-               var entity = graph.entity(entityID);
-               var preset = _mainPresetIndex.match(entity, graph);
-
-               if (!preset || preset.isFallback()) return null;
+           if (cached.length || !this.authenticated()) {
+             callback(undefined, cached);
+             if (!this.authenticated()) return; // require auth
+           }
 
-               if (entity.type === 'node' &&
-                   preset.id !== 'address' &&
-                   Object.keys(entity.tags).some(function(key) {
-                       return key.match(/^addr:.{1,}/);
-                   })) {
+           utilArrayChunk(toLoad, 150).forEach(function (arr) {
+             oauth.xhr({
+               method: 'GET',
+               path: '/api/0.6/users?users=' + arr.join()
+             }, wrapcb(this, done, _connectionID));
+           }.bind(this));
 
-                   return 'address';
-               }
-               if (entity.geometry(graph) === 'area' &&
-                   entity.tags.building &&
-                   !preset.tags.building) {
+           function done(err, xml) {
+             if (err) {
+               return callback(err);
+             }
 
-                   return 'building';
+             var options = {
+               skipSeen: true
+             };
+             return parseXML(xml, function (err, results) {
+               if (err) {
+                 return callback(err);
+               } else {
+                 return callback(undefined, results);
                }
-
-               return null;
+             }, options);
+           }
+         },
+         // Load a given user by id
+         // GET /api/0.6/user/#id
+         loadUser: function loadUser(uid, callback) {
+           if (_userCache.user[uid] || !this.authenticated()) {
+             // require auth
+             delete _userCache.toLoad[uid];
+             return callback(undefined, _userCache.user[uid]);
            }
 
-           var buildingKeysToKeep = ['architect', 'building', 'height', 'layer', 'source', 'type', 'wheelchair'];
-           var addressKeysToKeep = ['source'];
-
-           var operation = function () {
-               context.perform(function(graph) {
-
-                   for (var i in selectedIDs) {
-                       var entityID = selectedIDs[i];
-                       var type = downgradeTypeForEntityID(entityID);
-                       if (!type) continue;
-
-                       var tags = Object.assign({}, graph.entity(entityID).tags);  // shallow copy
-                       for (var key in tags) {
-                           if (type === 'address' && addressKeysToKeep.indexOf(key) !== -1) continue;
-                           if (type === 'building') {
-                               if (buildingKeysToKeep.indexOf(key) !== -1 ||
-                                   key.match(/^building:.{1,}/) ||
-                                   key.match(/^roof:.{1,}/)) continue;
-                           }
-                           // keep address tags for buildings too
-                           if (key.match(/^addr:.{1,}/)) continue;
-
-                           delete tags[key];
-                       }
-                       graph = actionChangeTags(entityID, tags)(graph);
-                   }
-                   return graph;
-               }, operation.annotation());
-
-               context.validator().validate();
-
-               // refresh the select mode to enable the delete operation
-               context.enter(modeSelect(context, selectedIDs));
-           };
-
-
-           operation.available = function () {
-               return downgradeType;
-           };
-
+           oauth.xhr({
+             method: 'GET',
+             path: '/api/0.6/user/' + uid
+           }, wrapcb(this, done, _connectionID));
 
-           operation.disabled = function () {
-               if (selectedIDs.some(hasWikidataTag)) {
-                   return 'has_wikidata_tag';
-               }
-               return false;
+           function done(err, xml) {
+             if (err) {
+               return callback(err);
+             }
 
-               function hasWikidataTag(id) {
-                   var entity = context.entity(id);
-                   return entity.tags.wikidata && entity.tags.wikidata.trim().length > 0;
+             var options = {
+               skipSeen: true
+             };
+             return parseXML(xml, function (err, results) {
+               if (err) {
+                 return callback(err);
+               } else {
+                 return callback(undefined, results[0]);
                }
-           };
-
+             }, options);
+           }
+         },
+         // Load the details of the logged-in user
+         // GET /api/0.6/user/details
+         userDetails: function userDetails(callback) {
+           if (_userDetails) {
+             // retrieve cached
+             return callback(undefined, _userDetails);
+           }
 
-           operation.tooltip = function () {
-               var disable = operation.disabled();
-               return disable ?
-                   _t('operations.downgrade.' + disable + '.' + multi) :
-                   _t('operations.downgrade.description.' + downgradeType);
-           };
+           oauth.xhr({
+             method: 'GET',
+             path: '/api/0.6/user/details'
+           }, wrapcb(this, done, _connectionID));
 
+           function done(err, xml) {
+             if (err) {
+               return callback(err);
+             }
 
-           operation.annotation = function () {
-               var suffix;
-               if (downgradeType === 'building_address') {
-                   suffix = 'multiple';
+             var options = {
+               skipSeen: false
+             };
+             return parseXML(xml, function (err, results) {
+               if (err) {
+                 return callback(err);
                } else {
-                   suffix = downgradeType + '.' + multi;
+                 _userDetails = results[0];
+                 return callback(undefined, _userDetails);
                }
-               return _t('operations.downgrade.annotation.' + suffix, { n: affectedFeatureCount});
-           };
-
-
-           operation.id = 'downgrade';
-           operation.keys = [uiCmd('⌘⌫'), uiCmd('⌘⌦'), uiCmd('⌦')];
-           operation.title = _t('operations.downgrade.title');
-           operation.behavior = behaviorOperation(context).which(operation);
-
-
-           return operation;
-       }
-
-       function operationExtract(context, selectedIDs) {
-
-           var _amount = selectedIDs.length === 1 ? 'single' : 'multiple';
-           var _geometries = utilArrayUniq(selectedIDs.map(function(entityID) {
-               return context.graph().hasEntity(entityID) && context.graph().geometry(entityID);
-           }).filter(Boolean));
-           var _geometryID = _geometries.length === 1 ? _geometries[0] : 'feature';
-
-           var _extent;
-           var _actions = selectedIDs.map(function(entityID) {
-               var graph = context.graph();
-               var entity = graph.hasEntity(entityID);
-               if (!entity || !entity.hasInterestingTags()) return;
-
-               if (entity.type === 'node' && graph.parentWays(entity).length === 0) return;
+             }, options);
+           }
+         },
+         // Load previous changesets for the logged in user
+         // GET /api/0.6/changesets?user=#id
+         userChangesets: function userChangesets(callback) {
+           if (_userChangesets) {
+             // retrieve cached
+             return callback(undefined, _userChangesets);
+           }
 
-               if (entity.type !== 'node') {
-                   var preset = _mainPresetIndex.match(entity, graph);
-                   // only allow extraction from ways/relations if the preset supports points
-                   if (preset.geometry.indexOf('point') === -1) return;
-               }
+           this.userDetails(wrapcb(this, gotDetails, _connectionID));
 
-               _extent = _extent ? _extent.extend(entity.extent(graph)) : entity.extent(graph);
+           function gotDetails(err, user) {
+             if (err) {
+               return callback(err);
+             }
 
-               return actionExtract(entityID);
-           }).filter(Boolean);
+             oauth.xhr({
+               method: 'GET',
+               path: '/api/0.6/changesets?user=' + user.id
+             }, wrapcb(this, done, _connectionID));
+           }
 
+           function done(err, xml) {
+             if (err) {
+               return callback(err);
+             }
 
-           var operation = function () {
-               var combinedAction = function(graph) {
-                   _actions.forEach(function(action) {
-                       graph = action(graph);
-                   });
-                   return graph;
+             _userChangesets = Array.prototype.map.call(xml.getElementsByTagName('changeset'), function (changeset) {
+               return {
+                 tags: getTags(changeset)
                };
-               context.perform(combinedAction, operation.annotation());  // do the extract
-
-               var extractedNodeIDs = _actions.map(function(action) {
-                   return action.getExtractedNodeID();
-               });
-               context.enter(modeSelect(context, extractedNodeIDs));
-           };
+             }).filter(function (changeset) {
+               var comment = changeset.tags.comment;
+               return comment && comment !== '';
+             });
+             return callback(undefined, _userChangesets);
+           }
+         },
+         // Fetch the status of the OSM API
+         // GET /api/capabilities
+         status: function status(callback) {
+           var url = urlroot + '/api/capabilities';
+           var errback = wrapcb(this, done, _connectionID);
+           d3_xml(url).then(function (data) {
+             errback(null, data);
+           })["catch"](function (err) {
+             errback(err.message);
+           });
 
+           function done(err, xml) {
+             if (err) {
+               // the status is null if no response could be retrieved
+               return callback(err, null);
+             } // update blocklists
 
-           operation.available = function () {
-               return _actions.length && selectedIDs.length === _actions.length;
-           };
 
+             var elements = xml.getElementsByTagName('blacklist');
+             var regexes = [];
 
-           operation.disabled = function () {
+             for (var i = 0; i < elements.length; i++) {
+               var regexString = elements[i].getAttribute('regex'); // needs unencode?
 
-               if (_extent && _extent.percentContainedIn(context.map().extent()) < 0.8) {
-                   return 'too_large';
-               } else if (selectedIDs.some(function(entityID) {
-                   return context.graph().geometry(entityID) === 'vertex' && context.hasHiddenConnections(entityID);
-               })) {
-                   return 'connected_to_hidden';
+               if (regexString) {
+                 try {
+                   var regex = new RegExp(regexString);
+                   regexes.push(regex);
+                 } catch (e) {
+                   /* noop */
+                 }
                }
+             }
 
-               return false;
-           };
+             if (regexes.length) {
+               _imageryBlocklists = regexes;
+             }
 
+             if (_rateLimitError) {
+               return callback(_rateLimitError, 'rateLimited');
+             } else {
+               var waynodes = xml.getElementsByTagName('waynodes');
+               var maxWayNodes = waynodes.length && parseInt(waynodes[0].getAttribute('maximum'), 10);
+               if (maxWayNodes && isFinite(maxWayNodes)) _maxWayNodes = maxWayNodes;
+               var apiStatus = xml.getElementsByTagName('status');
+               var val = apiStatus[0].getAttribute('api');
+               return callback(undefined, val);
+             }
+           }
+         },
+         // Calls `status` and dispatches an `apiStatusChange` event if the returned
+         // status differs from the cached status.
+         reloadApiStatus: function reloadApiStatus() {
+           // throttle to avoid unnecessary API calls
+           if (!this.throttledReloadApiStatus) {
+             var that = this;
+             this.throttledReloadApiStatus = throttle(function () {
+               that.status(function (err, status) {
+                 if (status !== _cachedApiStatus) {
+                   _cachedApiStatus = status;
+                   dispatch$6.call('apiStatusChange', that, err, status);
+                 }
+               });
+             }, 500);
+           }
 
-           operation.tooltip = function () {
-               var disableReason = operation.disabled();
-               if (disableReason) {
-                   return _t('operations.extract.' + disableReason + '.' + _amount);
-               } else {
-                   return _t('operations.extract.description.' + _geometryID + '.' + _amount);
-               }
-           };
+           this.throttledReloadApiStatus();
+         },
+         // Returns the maximum number of nodes a single way can have
+         maxWayNodes: function maxWayNodes() {
+           return _maxWayNodes;
+         },
+         // Load data (entities) from the API in tiles
+         // GET /api/0.6/map?bbox=
+         loadTiles: function loadTiles(projection, callback) {
+           if (_off) return; // determine the needed tiles to cover the view
 
+           var tiles = tiler$5.zoomExtent([_tileZoom$3, _tileZoom$3]).getTiles(projection); // abort inflight requests that are no longer needed
 
-           operation.annotation = function () {
-               return _t('operations.extract.annotation.' + _amount, { n: selectedIDs.length });
-           };
+           var hadRequests = hasInflightRequests(_tileCache);
+           abortUnwantedRequests$3(_tileCache, tiles);
 
+           if (hadRequests && !hasInflightRequests(_tileCache)) {
+             dispatch$6.call('loaded'); // stop the spinner
+           } // issue new requests..
 
-           operation.id = 'extract';
-           operation.keys = [_t('operations.extract.key')];
-           operation.title = _t('operations.extract.title');
-           operation.behavior = behaviorOperation(context).which(operation);
 
+           tiles.forEach(function (tile) {
+             this.loadTile(tile, callback);
+           }, this);
+         },
+         // Load a single data tile
+         // GET /api/0.6/map?bbox=
+         loadTile: function loadTile(tile, callback) {
+           if (_off) return;
+           if (_tileCache.loaded[tile.id] || _tileCache.inflight[tile.id]) return;
 
-           return operation;
-       }
+           if (!hasInflightRequests(_tileCache)) {
+             dispatch$6.call('loading'); // start the spinner
+           }
 
-       function operationMerge(context, selectedIDs) {
+           var path = '/api/0.6/map.json?bbox=';
+           var options = {
+             skipSeen: true
+           };
+           _tileCache.inflight[tile.id] = this.loadFromAPI(path + tile.extent.toParam(), tileCallback, options);
 
-           var _action = getAction();
+           function tileCallback(err, parsed) {
+             delete _tileCache.inflight[tile.id];
 
-           function getAction() {
-               // prefer a non-disabled action first
-               var join = actionJoin(selectedIDs);
-               if (!join.disabled(context.graph())) return join;
+             if (!err) {
+               delete _tileCache.toLoad[tile.id];
+               _tileCache.loaded[tile.id] = true;
+               var bbox = tile.extent.bbox();
+               bbox.id = tile.id;
 
-               var merge = actionMerge(selectedIDs);
-               if (!merge.disabled(context.graph())) return merge;
+               _tileCache.rtree.insert(bbox);
+             }
 
-               var mergePolygon = actionMergePolygon(selectedIDs);
-               if (!mergePolygon.disabled(context.graph())) return mergePolygon;
+             if (callback) {
+               callback(err, Object.assign({
+                 data: parsed
+               }, tile));
+             }
 
-               var mergeNodes = actionMergeNodes(selectedIDs);
-               if (!mergeNodes.disabled(context.graph())) return mergeNodes;
+             if (!hasInflightRequests(_tileCache)) {
+               dispatch$6.call('loaded'); // stop the spinner
+             }
+           }
+         },
+         isDataLoaded: function isDataLoaded(loc) {
+           var bbox = {
+             minX: loc[0],
+             minY: loc[1],
+             maxX: loc[0],
+             maxY: loc[1]
+           };
+           return _tileCache.rtree.collides(bbox);
+         },
+         // load the tile that covers the given `loc`
+         loadTileAtLoc: function loadTileAtLoc(loc, callback) {
+           // Back off if the toLoad queue is filling up.. re #6417
+           // (Currently `loadTileAtLoc` requests are considered low priority - used by operations to
+           // let users safely edit geometries which extend to unloaded tiles.  We can drop some.)
+           if (Object.keys(_tileCache.toLoad).length > 50) return;
+           var k = geoZoomToScale(_tileZoom$3 + 1);
+           var offset = geoRawMercator().scale(k)(loc);
+           var projection = geoRawMercator().transform({
+             k: k,
+             x: -offset[0],
+             y: -offset[1]
+           });
+           var tiles = tiler$5.zoomExtent([_tileZoom$3, _tileZoom$3]).getTiles(projection);
+           tiles.forEach(function (tile) {
+             if (_tileCache.toLoad[tile.id] || _tileCache.loaded[tile.id] || _tileCache.inflight[tile.id]) return;
+             _tileCache.toLoad[tile.id] = true;
+             this.loadTile(tile, callback);
+           }, this);
+         },
+         // Load notes from the API in tiles
+         // GET /api/0.6/notes?bbox=
+         loadNotes: function loadNotes(projection, noteOptions) {
+           noteOptions = Object.assign({
+             limit: 10000,
+             closed: 7
+           }, noteOptions);
+           if (_off) return;
+           var that = this;
+           var path = '/api/0.6/notes?limit=' + noteOptions.limit + '&closed=' + noteOptions.closed + '&bbox=';
+
+           var throttleLoadUsers = throttle(function () {
+             var uids = Object.keys(_userCache.toLoad);
+             if (!uids.length) return;
+             that.loadUsers(uids, function () {}); // eagerly load user details
+           }, 750); // determine the needed tiles to cover the view
+
+
+           var tiles = tiler$5.zoomExtent([_noteZoom, _noteZoom]).getTiles(projection); // abort inflight requests that are no longer needed
+
+           abortUnwantedRequests$3(_noteCache, tiles); // issue new requests..
+
+           tiles.forEach(function (tile) {
+             if (_noteCache.loaded[tile.id] || _noteCache.inflight[tile.id]) return;
+             var options = {
+               skipSeen: false
+             };
+             _noteCache.inflight[tile.id] = that.loadFromAPI(path + tile.extent.toParam(), function (err) {
+               delete _noteCache.inflight[tile.id];
 
-               // otherwise prefer an action with an interesting disabled reason
-               if (join.disabled(context.graph()) !== 'not_eligible') return join;
-               if (merge.disabled(context.graph()) !== 'not_eligible') return merge;
-               if (mergePolygon.disabled(context.graph()) !== 'not_eligible') return mergePolygon;
+               if (!err) {
+                 _noteCache.loaded[tile.id] = true;
+               }
 
-               return mergeNodes;
+               throttleLoadUsers();
+               dispatch$6.call('loadedNotes');
+             }, options);
+           });
+         },
+         // Create a note
+         // POST /api/0.6/notes?params
+         postNoteCreate: function postNoteCreate(note, callback) {
+           if (!this.authenticated()) {
+             return callback({
+               message: 'Not Authenticated',
+               status: -3
+             }, note);
            }
 
-           var operation = function() {
-
-               if (operation.disabled()) return;
+           if (_noteCache.inflightPost[note.id]) {
+             return callback({
+               message: 'Note update already inflight',
+               status: -2
+             }, note);
+           }
 
-               context.perform(_action, operation.annotation());
+           if (!note.loc[0] || !note.loc[1] || !note.newComment) return; // location & description required
 
-               context.validator().validate();
+           var comment = note.newComment;
 
-               var resultIDs = selectedIDs.filter(context.hasEntity);
-               if (resultIDs.length > 1) {
-                   var interestingIDs = resultIDs.filter(function(id) {
-                       return context.entity(id).hasInterestingTags();
-                   });
-                   if (interestingIDs.length) resultIDs = interestingIDs;
-               }
-               context.enter(modeSelect(context, resultIDs));
-           };
+           if (note.newCategory && note.newCategory !== 'None') {
+             comment += ' #' + note.newCategory;
+           }
 
-           operation.available = function() {
-               return selectedIDs.length >= 2;
-           };
+           var path = '/api/0.6/notes?' + utilQsString({
+             lon: note.loc[0],
+             lat: note.loc[1],
+             text: comment
+           });
+           _noteCache.inflightPost[note.id] = oauth.xhr({
+             method: 'POST',
+             path: path
+           }, wrapcb(this, done, _connectionID));
 
-           operation.disabled = function() {
-               var actionDisabled = _action.disabled(context.graph());
-               if (actionDisabled) return actionDisabled;
+           function done(err, xml) {
+             delete _noteCache.inflightPost[note.id];
 
-               var osm = context.connection();
-               if (osm &&
-                   _action.resultingWayNodesLength &&
-                   _action.resultingWayNodesLength(context.graph()) > osm.maxWayNodes()) {
-                   return 'too_many_vertices';
-               }
+             if (err) {
+               return callback(err);
+             } // we get the updated note back, remove from caches and reparse..
 
-               return false;
-           };
 
-           operation.tooltip = function() {
-               var disabled = operation.disabled();
-               if (disabled) {
-                   if (disabled === 'restriction') {
-                       return _t('operations.merge.restriction',
-                           { relation: _mainPresetIndex.item('type/restriction').name() });
-                   }
-                   return _t('operations.merge.' + disabled);
+             this.removeNote(note);
+             var options = {
+               skipSeen: false
+             };
+             return parseXML(xml, function (err, results) {
+               if (err) {
+                 return callback(err);
+               } else {
+                 return callback(undefined, results[0]);
                }
-               return _t('operations.merge.description');
-           };
+             }, options);
+           }
+         },
+         // Update a note
+         // POST /api/0.6/notes/#id/comment?text=comment
+         // POST /api/0.6/notes/#id/close?text=comment
+         // POST /api/0.6/notes/#id/reopen?text=comment
+         postNoteUpdate: function postNoteUpdate(note, newStatus, callback) {
+           if (!this.authenticated()) {
+             return callback({
+               message: 'Not Authenticated',
+               status: -3
+             }, note);
+           }
+
+           if (_noteCache.inflightPost[note.id]) {
+             return callback({
+               message: 'Note update already inflight',
+               status: -2
+             }, note);
+           }
+
+           var action;
+
+           if (note.status !== 'closed' && newStatus === 'closed') {
+             action = 'close';
+           } else if (note.status !== 'open' && newStatus === 'open') {
+             action = 'reopen';
+           } else {
+             action = 'comment';
+             if (!note.newComment) return; // when commenting, comment required
+           }
 
-           operation.annotation = function() {
-               return _t('operations.merge.annotation', { n: selectedIDs.length });
-           };
+           var path = '/api/0.6/notes/' + note.id + '/' + action;
 
-           operation.id = 'merge';
-           operation.keys = [_t('operations.merge.key')];
-           operation.title = _t('operations.merge.title');
-           operation.behavior = behaviorOperation(context).which(operation);
+           if (note.newComment) {
+             path += '?' + utilQsString({
+               text: note.newComment
+             });
+           }
 
-           return operation;
-       }
+           _noteCache.inflightPost[note.id] = oauth.xhr({
+             method: 'POST',
+             path: path
+           }, wrapcb(this, done, _connectionID));
 
-       // see also `behaviorPaste`
-       function operationPaste(context) {
+           function done(err, xml) {
+             delete _noteCache.inflightPost[note.id];
 
-           var _pastePoint;
+             if (err) {
+               return callback(err);
+             } // we get the updated note back, remove from caches and reparse..
 
-           var operation = function() {
 
-               if (!_pastePoint) return;
+             this.removeNote(note); // update closed note cache - used to populate `closed:note` changeset tag
 
-               var oldIDs = context.copyIDs();
-               if (!oldIDs.length) return;
+             if (action === 'close') {
+               _noteCache.closed[note.id] = true;
+             } else if (action === 'reopen') {
+               delete _noteCache.closed[note.id];
+             }
 
-               var projection = context.projection;
-               var extent = geoExtent();
-               var oldGraph = context.copyGraph();
-               var newIDs = [];
+             var options = {
+               skipSeen: false
+             };
+             return parseXML(xml, function (err, results) {
+               if (err) {
+                 return callback(err);
+               } else {
+                 return callback(undefined, results[0]);
+               }
+             }, options);
+           }
+         },
+         "switch": function _switch(options) {
+           urlroot = options.urlroot;
+           oauth.options(Object.assign({
+             url: urlroot,
+             loading: authLoading,
+             done: authDone
+           }, options));
+           this.reset();
+           this.userChangesets(function () {}); // eagerly load user details/changesets
+
+           dispatch$6.call('change');
+           return this;
+         },
+         toggle: function toggle(val) {
+           _off = !val;
+           return this;
+         },
+         isChangesetInflight: function isChangesetInflight() {
+           return !!_changeset.inflight;
+         },
+         // get/set cached data
+         // This is used to save/restore the state when entering/exiting the walkthrough
+         // Also used for testing purposes.
+         caches: function caches(obj) {
+           function cloneCache(source) {
+             var target = {};
+             Object.keys(source).forEach(function (k) {
+               if (k === 'rtree') {
+                 target.rtree = new RBush().fromJSON(source.rtree.toJSON()); // clone rbush
+               } else if (k === 'note') {
+                 target.note = {};
+                 Object.keys(source.note).forEach(function (id) {
+                   target.note[id] = osmNote(source.note[id]); // copy notes
+                 });
+               } else {
+                 target[k] = JSON.parse(JSON.stringify(source[k])); // clone deep
+               }
+             });
+             return target;
+           }
 
-               var action = actionCopyEntities(oldIDs, oldGraph);
-               context.perform(action);
+           if (!arguments.length) {
+             return {
+               tile: cloneCache(_tileCache),
+               note: cloneCache(_noteCache),
+               user: cloneCache(_userCache)
+             };
+           } // access caches directly for testing (e.g., loading notes rtree)
 
-               var copies = action.copies();
-               var originals = new Set();
-               Object.values(copies).forEach(function(entity) { originals.add(entity.id); });
 
-               for (var id in copies) {
-                   var oldEntity = oldGraph.entity(id);
-                   var newEntity = copies[id];
+           if (obj === 'get') {
+             return {
+               tile: _tileCache,
+               note: _noteCache,
+               user: _userCache
+             };
+           }
 
-                   extent._extend(oldEntity.extent(oldGraph));
+           if (obj.tile) {
+             _tileCache = obj.tile;
+             _tileCache.inflight = {};
+           }
 
-                   // Exclude child nodes from newIDs if their parent way was also copied.
-                   var parents = context.graph().parentWays(newEntity);
-                   var parentCopied = parents.some(function(parent) {
-                       return originals.has(parent.id);
-                   });
+           if (obj.note) {
+             _noteCache = obj.note;
+             _noteCache.inflight = {};
+             _noteCache.inflightPost = {};
+           }
 
-                   if (!parentCopied) {
-                       newIDs.push(newEntity.id);
-                   }
-               }
+           if (obj.user) {
+             _userCache = obj.user;
+           }
 
-               // Use the location of the copy operation to offset the paste location,
-               // or else use the center of the pasted extent
-               var copyPoint = (context.copyLonLat() && projection(context.copyLonLat())) ||
-                   projection(extent.center());
-               var delta = geoVecSubtract(_pastePoint, copyPoint);
+           return this;
+         },
+         logout: function logout() {
+           _userChangesets = undefined;
+           _userDetails = undefined;
+           oauth.logout();
+           dispatch$6.call('change');
+           return this;
+         },
+         authenticated: function authenticated() {
+           return oauth.authenticated();
+         },
+         authenticate: function authenticate(callback) {
+           var that = this;
+           var cid = _connectionID;
+           _userChangesets = undefined;
+           _userDetails = undefined;
 
-               // Move the pasted objects to be anchored at the paste location
-               context.replace(actionMove(newIDs, delta, projection), operation.annotation());
-               context.enter(modeSelect(context, newIDs));
-           };
+           function done(err, res) {
+             if (err) {
+               if (callback) callback(err);
+               return;
+             }
 
-           operation.point = function(val) {
-               _pastePoint = val;
-               return operation;
-           };
+             if (that.getConnectionId() !== cid) {
+               if (callback) callback({
+                 message: 'Connection Switched',
+                 status: -1
+               });
+               return;
+             }
 
-           operation.available = function() {
-               return context.mode().id === 'browse';
-           };
+             _rateLimitError = undefined;
+             dispatch$6.call('change');
+             if (callback) callback(err, res);
+             that.userChangesets(function () {}); // eagerly load user details/changesets
+           }
 
-           operation.disabled = function() {
-               return !context.copyIDs().length;
-           };
+           return oauth.authenticate(done);
+         },
+         imageryBlocklists: function imageryBlocklists() {
+           return _imageryBlocklists;
+         },
+         tileZoom: function tileZoom(val) {
+           if (!arguments.length) return _tileZoom$3;
+           _tileZoom$3 = val;
+           return this;
+         },
+         // get all cached notes covering the viewport
+         notes: function notes(projection) {
+           var viewport = projection.clipExtent();
+           var min = [viewport[0][0], viewport[1][1]];
+           var max = [viewport[1][0], viewport[0][1]];
+           var bbox = geoExtent(projection.invert(min), projection.invert(max)).bbox();
+           return _noteCache.rtree.search(bbox).map(function (d) {
+             return d.data;
+           });
+         },
+         // get a single note from the cache
+         getNote: function getNote(id) {
+           return _noteCache.note[id];
+         },
+         // remove a single note from the cache
+         removeNote: function removeNote(note) {
+           if (!(note instanceof osmNote) || !note.id) return;
+           delete _noteCache.note[note.id];
+           updateRtree$3(encodeNoteRtree(note), false); // false = remove
+         },
+         // replace a single note in the cache
+         replaceNote: function replaceNote(note) {
+           if (!(note instanceof osmNote) || !note.id) return;
+           _noteCache.note[note.id] = note;
+           updateRtree$3(encodeNoteRtree(note), true); // true = replace
 
-           operation.tooltip = function() {
-               var oldGraph = context.copyGraph();
-               var ids = context.copyIDs();
-               if (!ids.length) {
-                   return _t('operations.paste.nothing_copied');
-               }
-               return ids.length === 1 ?
-                   _t('operations.paste.description.single', { feature: utilDisplayLabel(oldGraph.entity(ids[0]), oldGraph) }) :
-                   _t('operations.paste.description.multiple', { n: ids.length.toString() });
-           };
+           return note;
+         },
+         // Get an array of note IDs closed during this session.
+         // Used to populate `closed:note` changeset tag
+         getClosedIDs: function getClosedIDs() {
+           return Object.keys(_noteCache.closed).sort();
+         }
+       };
 
-           operation.annotation = function() {
-               var ids = context.copyIDs();
-               return ids.length === 1 ?
-                   _t('operations.paste.annotation.single') :
-                   _t('operations.paste.annotation.multiple', { n: ids.length.toString() });
-           };
+       var _apibase = 'https://wiki.openstreetmap.org/w/api.php';
+       var _inflight$1 = {};
+       var _wikibaseCache = {};
+       var _localeIDs = {
+         en: false
+       };
 
-           operation.id = 'paste';
-           operation.keys = [uiCmd('⌘V')];
-           operation.title = _t('operations.paste.title');
+       var debouncedRequest = debounce(request, 500, {
+         leading: false
+       });
 
-           return operation;
+       function request(url, callback) {
+         if (_inflight$1[url]) return;
+         var controller = new AbortController();
+         _inflight$1[url] = controller;
+         d3_json(url, {
+           signal: controller.signal
+         }).then(function (result) {
+           delete _inflight$1[url];
+           if (callback) callback(null, result);
+         })["catch"](function (err) {
+           delete _inflight$1[url];
+           if (err.name === 'AbortError') return;
+           if (callback) callback(err.message);
+         });
        }
 
-       function operationReverse(context, selectedIDs) {
-
-           var operation = function() {
-               context.perform(function combinedReverseAction(graph) {
-                   actions().forEach(function(action) {
-                       graph = action(graph);
-                   });
-                   return graph;
-               }, operation.annotation());
-               context.validator().validate();
-           };
-
-           function actions(situation) {
-               return selectedIDs.map(function(entityID) {
-                   var entity = context.hasEntity(entityID);
-                   if (!entity) return;
-
-                   if (situation === 'toolbar') {
-                       if (entity.type === 'way' &&
-                           (!entity.isOneWay() && !entity.isSided())) return;
-                   }
+       var serviceOsmWikibase = {
+         init: function init() {
+           _inflight$1 = {};
+           _wikibaseCache = {};
+           _localeIDs = {};
+         },
+         reset: function reset() {
+           Object.values(_inflight$1).forEach(function (controller) {
+             controller.abort();
+           });
+           _inflight$1 = {};
+         },
 
-                   var geometry = entity.geometry(context.graph());
-                   if (entity.type !== 'node' && geometry !== 'line') return;
+         /**
+          * Get the best value for the property, or undefined if not found
+          * @param entity object from wikibase
+          * @param property string e.g. 'P4' for image
+          * @param langCode string e.g. 'fr' for French
+          */
+         claimToValue: function claimToValue(entity, property, langCode) {
+           if (!entity.claims[property]) return undefined;
+           var locale = _localeIDs[langCode];
+           var preferredPick, localePick;
+           entity.claims[property].forEach(function (stmt) {
+             // If exists, use value limited to the needed language (has a qualifier P26 = locale)
+             // Or if not found, use the first value with the "preferred" rank
+             if (!preferredPick && stmt.rank === 'preferred') {
+               preferredPick = stmt;
+             }
 
-                   var action = actionReverse(entityID);
-                   if (action.disabled(context.graph())) return;
+             if (locale && stmt.qualifiers && stmt.qualifiers.P26 && stmt.qualifiers.P26[0].datavalue.value.id === locale) {
+               localePick = stmt;
+             }
+           });
+           var result = localePick || preferredPick;
 
-                   return action;
-               }).filter(Boolean);
+           if (result) {
+             var datavalue = result.mainsnak.datavalue;
+             return datavalue.type === 'wikibase-entityid' ? datavalue.value.id : datavalue.value;
+           } else {
+             return undefined;
            }
+         },
 
-           function reverseTypeID() {
-               var acts = actions();
-               var nodeActionCount = acts.filter(function(act) {
-                   var entity = context.hasEntity(act.entityID());
-                   return entity && entity.type === 'node';
-               }).length;
-               var typeID = nodeActionCount === 0 ? 'line' : (nodeActionCount === acts.length ? 'point' : 'features');
-               if (typeID !== 'features' && acts.length > 1) typeID += 's';
-               return typeID;
+         /**
+          * Convert monolingual property into a key-value object (language -> value)
+          * @param entity object from wikibase
+          * @param property string e.g. 'P31' for monolingual wiki page title
+          */
+         monolingualClaimToValueObj: function monolingualClaimToValueObj(entity, property) {
+           if (!entity || !entity.claims[property]) return undefined;
+           return entity.claims[property].reduce(function (acc, obj) {
+             var value = obj.mainsnak.datavalue.value;
+             acc[value.language] = value.text;
+             return acc;
+           }, {});
+         },
+         toSitelink: function toSitelink(key, value) {
+           var result = value ? 'Tag:' + key + '=' + value : 'Key:' + key;
+           return result.replace(/_/g, ' ').trim();
+         },
+         //
+         // Pass params object of the form:
+         // {
+         //   key: 'string',
+         //   value: 'string',
+         //   langCode: 'string'
+         // }
+         //
+         getEntity: function getEntity(params, callback) {
+           var doRequest = params.debounce ? debouncedRequest : request;
+           var that = this;
+           var titles = [];
+           var result = {};
+           var rtypeSitelink = params.key === 'type' && params.value ? ('Relation:' + params.value).replace(/_/g, ' ').trim() : false;
+           var keySitelink = params.key ? this.toSitelink(params.key) : false;
+           var tagSitelink = params.key && params.value ? this.toSitelink(params.key, params.value) : false;
+           var localeSitelink;
+
+           if (params.langCodes) {
+             params.langCodes.forEach(function (langCode) {
+               if (_localeIDs[langCode] === undefined) {
+                 // If this is the first time we are asking about this locale,
+                 // fetch corresponding entity (if it exists), and cache it.
+                 // If there is no such entry, cache `false` value to avoid re-requesting it.
+                 localeSitelink = ('Locale:' + langCode).replace(/_/g, ' ').trim();
+                 titles.push(localeSitelink);
+               }
+             });
            }
 
+           if (rtypeSitelink) {
+             if (_wikibaseCache[rtypeSitelink]) {
+               result.rtype = _wikibaseCache[rtypeSitelink];
+             } else {
+               titles.push(rtypeSitelink);
+             }
+           }
 
-           operation.available = function(situation) {
-               return actions(situation).length > 0;
-           };
+           if (keySitelink) {
+             if (_wikibaseCache[keySitelink]) {
+               result.key = _wikibaseCache[keySitelink];
+             } else {
+               titles.push(keySitelink);
+             }
+           }
 
+           if (tagSitelink) {
+             if (_wikibaseCache[tagSitelink]) {
+               result.tag = _wikibaseCache[tagSitelink];
+             } else {
+               titles.push(tagSitelink);
+             }
+           }
 
-           operation.disabled = function() {
-               return false;
-           };
+           if (!titles.length) {
+             // Nothing to do, we already had everything in the cache
+             return callback(null, result);
+           } // Requesting just the user language code
+           // If backend recognizes the code, it will perform proper fallbacks,
+           // and the result will contain the requested code. If not, all values are returned:
+           // {"zh-tw":{"value":"...","language":"zh-tw","source-language":"zh-hant"}
+           // {"pt-br":{"value":"...","language":"pt","for-language":"pt-br"}}
 
 
-           operation.tooltip = function() {
-               return _t('operations.reverse.description.' + reverseTypeID());
-           };
+           var obj = {
+             action: 'wbgetentities',
+             sites: 'wiki',
+             titles: titles.join('|'),
+             languages: params.langCodes.join('|'),
+             languagefallback: 1,
+             origin: '*',
+             format: 'json' // There is an MW Wikibase API bug https://phabricator.wikimedia.org/T212069
+             // We shouldn't use v1 until it gets fixed, but should switch to it afterwards
+             // formatversion: 2,
+
+           };
+           var url = _apibase + '?' + utilQsString(obj);
+           doRequest(url, function (err, d) {
+             if (err) {
+               callback(err);
+             } else if (!d.success || d.error) {
+               callback(d.error.messages.map(function (v) {
+                 return v.html['*'];
+               }).join('<br>'));
+             } else {
+               var localeID = false;
+               Object.values(d.entities).forEach(function (res) {
+                 if (res.missing !== '') {
+                   var title = res.sitelinks.wiki.title;
+
+                   if (title === rtypeSitelink) {
+                     _wikibaseCache[rtypeSitelink] = res;
+                     result.rtype = res;
+                   } else if (title === keySitelink) {
+                     _wikibaseCache[keySitelink] = res;
+                     result.key = res;
+                   } else if (title === tagSitelink) {
+                     _wikibaseCache[tagSitelink] = res;
+                     result.tag = res;
+                   } else if (title === localeSitelink) {
+                     localeID = res.id;
+                   } else {
+                     console.log('Unexpected title ' + title); // eslint-disable-line no-console
+                   }
+                 }
+               });
 
+               if (localeSitelink) {
+                 // If locale ID is not found, store false to prevent repeated queries
+                 that.addLocale(params.langCodes[0], localeID);
+               }
 
-           operation.annotation = function() {
-               return _t('operations.reverse.annotation.' + reverseTypeID());
-           };
+               callback(null, result);
+             }
+           });
+         },
+         //
+         // Pass params object of the form:
+         // {
+         //   key: 'string',     // required
+         //   value: 'string'    // optional
+         // }
+         //
+         // Get an result object used to display tag documentation
+         // {
+         //   title:        'string',
+         //   description:  'string',
+         //   editURL:      'string',
+         //   imageURL:     'string',
+         //   wiki:         { title: 'string', text: 'string', url: 'string' }
+         // }
+         //
+         getDocs: function getDocs(params, callback) {
+           var that = this;
+           var langCodes = _mainLocalizer.localeCodes().map(function (code) {
+             return code.toLowerCase();
+           });
+           params.langCodes = langCodes;
+           this.getEntity(params, function (err, data) {
+             if (err) {
+               callback(err);
+               return;
+             }
 
+             var entity = data.rtype || data.tag || data.key;
 
-           operation.id = 'reverse';
-           operation.keys = [_t('operations.reverse.key')];
-           operation.title = _t('operations.reverse.title');
-           operation.behavior = behaviorOperation(context).which(operation);
+             if (!entity) {
+               callback('No entity');
+               return;
+             }
 
-           return operation;
-       }
+             var i;
+             var description;
 
-       function operationSplit(context, selectedIDs) {
-           var vertices = selectedIDs
-               .filter(function(id) { return context.graph().geometry(id) === 'vertex'; });
-           var entityID = vertices[0];
-           var action = actionSplit(entityID);
-           var ways = [];
+             for (i in langCodes) {
+               var _code = langCodes[i];
 
-           if (vertices.length === 1) {
-               if (entityID && selectedIDs.length > 1) {
-                   var ids = selectedIDs.filter(function(id) { return id !== entityID; });
-                   action.limitWays(ids);
+               if (entity.descriptions[_code] && entity.descriptions[_code].language === _code) {
+                 description = entity.descriptions[_code];
+                 break;
                }
-               ways = action.ways(context.graph());
-           }
+             }
 
+             if (!description && Object.values(entity.descriptions).length) description = Object.values(entity.descriptions)[0]; // prepare result
 
-           var operation = function() {
-               var difference = context.perform(action, operation.annotation());
-               context.enter(modeSelect(context, difference.extantIDs()));
-           };
+             var result = {
+               title: entity.title,
+               description: description ? description.value : '',
+               descriptionLocaleCode: description ? description.language : '',
+               editURL: 'https://wiki.openstreetmap.org/wiki/' + entity.title
+             }; // add image
 
+             if (entity.claims) {
+               var imageroot;
+               var image = that.claimToValue(entity, 'P4', langCodes[0]);
 
-           operation.available = function() {
-               return vertices.length === 1;
-           };
+               if (image) {
+                 imageroot = 'https://commons.wikimedia.org/w/index.php';
+               } else {
+                 image = that.claimToValue(entity, 'P28', langCodes[0]);
 
+                 if (image) {
+                   imageroot = 'https://wiki.openstreetmap.org/w/index.php';
+                 }
+               }
 
-           operation.disabled = function() {
-               var reason = action.disabled(context.graph());
-               if (reason) {
-                   return reason;
-               } else if (selectedIDs.some(context.hasHiddenConnections)) {
-                   return 'connected_to_hidden';
+               if (imageroot && image) {
+                 result.imageURL = imageroot + '?' + utilQsString({
+                   title: 'Special:Redirect/file/' + image,
+                   width: 400
+                 });
                }
+             } // Try to get a wiki page from tag data item first, followed by the corresponding key data item.
+             // If neither tag nor key data item contain a wiki page in the needed language nor English,
+             // get the first found wiki page from either the tag or the key item.
 
-               return false;
-           };
 
+             var rtypeWiki = that.monolingualClaimToValueObj(data.rtype, 'P31');
+             var tagWiki = that.monolingualClaimToValueObj(data.tag, 'P31');
+             var keyWiki = that.monolingualClaimToValueObj(data.key, 'P31');
+             var wikis = [rtypeWiki, tagWiki, keyWiki];
 
-           operation.tooltip = function() {
-               var disable = operation.disabled();
-               if (disable) {
-                   return _t('operations.split.' + disable);
-               } else if (ways.length === 1) {
-                   return _t('operations.split.description.' + context.graph().geometry(ways[0].id));
-               } else {
-                   return _t('operations.split.description.multiple');
+             for (i in wikis) {
+               var wiki = wikis[i];
+
+               for (var j in langCodes) {
+                 var code = langCodes[j];
+                 var referenceId = langCodes[0].split('-')[0] !== 'en' && code.split('-')[0] === 'en' ? 'inspector.wiki_en_reference' : 'inspector.wiki_reference';
+                 var info = getWikiInfo(wiki, code, referenceId);
+
+                 if (info) {
+                   result.wiki = info;
+                   break;
+                 }
                }
-           };
 
+               if (result.wiki) break;
+             }
 
-           operation.annotation = function() {
-               return ways.length === 1 ?
-                   _t('operations.split.annotation.' + context.graph().geometry(ways[0].id)) :
-                   _t('operations.split.annotation.multiple', { n: ways.length });
-           };
+             callback(null, result); // Helper method to get wiki info if a given language exists
 
+             function getWikiInfo(wiki, langCode, tKey) {
+               if (wiki && wiki[langCode]) {
+                 return {
+                   title: wiki[langCode],
+                   text: tKey,
+                   url: 'https://wiki.openstreetmap.org/wiki/' + wiki[langCode]
+                 };
+               }
+             }
+           });
+         },
+         addLocale: function addLocale(langCode, qid) {
+           // Makes it easier to unit test
+           _localeIDs[langCode] = qid;
+         },
+         apibase: function apibase(val) {
+           if (!arguments.length) return _apibase;
+           _apibase = val;
+           return this;
+         }
+       };
 
-           operation.id = 'split';
-           operation.keys = [_t('operations.split.key')];
-           operation.title = _t('operations.split.title');
-           operation.behavior = behaviorOperation(context).which(operation);
+       var jsonpCache = {};
+       window.jsonpCache = jsonpCache;
+       function jsonpRequest(url, callback) {
+         var request = {
+           abort: function abort() {}
+         };
 
-           return operation;
-       }
+         if (window.JSONP_FIX) {
+           if (window.JSONP_DELAY === 0) {
+             callback(window.JSONP_FIX);
+           } else {
+             var t = window.setTimeout(function () {
+               callback(window.JSONP_FIX);
+             }, window.JSONP_DELAY || 0);
 
-       function operationStraighten(context, selectedIDs) {
-           var _wayIDs = selectedIDs.filter(function(id) { return id.charAt(0) === 'w'; });
-           var _nodeIDs = selectedIDs.filter(function(id) { return id.charAt(0) === 'n'; });
-           var _amount = ((_wayIDs.length ? _wayIDs : _nodeIDs).length === 1 ? 'single' : 'multiple');
-
-           var _nodes = utilGetAllNodes(selectedIDs, context.graph());
-           var _coords = _nodes.map(function(n) { return n.loc; });
-           var _extent = utilTotalExtent(selectedIDs, context.graph());
-           var _action = chooseAction();
-           var _geometry;
-
-
-           function chooseAction() {
-               // straighten selected nodes
-               if (_wayIDs.length === 0 && _nodeIDs.length > 2) {
-                   _geometry = 'points';
-                   return actionStraightenNodes(_nodeIDs, context.projection);
-
-               // straighten selected ways (possibly between range of 2 selected nodes)
-               } else if (_wayIDs.length > 0 && (_nodeIDs.length === 0 || _nodeIDs.length === 2)) {
-                   var startNodeIDs = [];
-                   var endNodeIDs = [];
-
-                   for (var i = 0; i < selectedIDs.length; i++) {
-                       var entity = context.entity(selectedIDs[i]);
-                       if (entity.type === 'node') {
-                           continue;
-                       } else if (entity.type !== 'way' || entity.isClosed()) {
-                           return null;  // exit early, can't straighten these
-                       }
+             request.abort = function () {
+               window.clearTimeout(t);
+             };
+           }
 
-                       startNodeIDs.push(entity.first());
-                       endNodeIDs.push(entity.last());
-                   }
+           return request;
+         }
 
-                   // Remove duplicate end/startNodeIDs (duplicate nodes cannot be at the line end)
-                   startNodeIDs = startNodeIDs.filter(function(n) {
-                       return startNodeIDs.indexOf(n) === startNodeIDs.lastIndexOf(n);
-                   });
-                   endNodeIDs = endNodeIDs.filter(function(n) {
-                       return endNodeIDs.indexOf(n) === endNodeIDs.lastIndexOf(n);
-                   });
+         function rand() {
+           var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
+           var c = '';
+           var i = -1;
 
-                   // Ensure all ways are connected (i.e. only 2 unique endpoints/startpoints)
-                   if (utilArrayDifference(startNodeIDs, endNodeIDs).length +
-                       utilArrayDifference(endNodeIDs, startNodeIDs).length !== 2) return null;
+           while (++i < 15) {
+             c += chars.charAt(Math.floor(Math.random() * 52));
+           }
 
-                   // Ensure path contains at least 3 unique nodes
-                   var wayNodeIDs = utilGetAllNodes(_wayIDs, context.graph())
-                       .map(function(node) { return node.id; });
-                   if (wayNodeIDs.length <= 2) return null;
+           return c;
+         }
 
-                   // If range of 2 selected nodes is supplied, ensure nodes lie on the selected path
-                   if (_nodeIDs.length === 2 && (
-                       wayNodeIDs.indexOf(_nodeIDs[0]) === -1 || wayNodeIDs.indexOf(_nodeIDs[1]) === -1
-                   )) return null;
+         function create(url) {
+           var e = url.match(/callback=(\w+)/);
+           var c = e ? e[1] : rand();
 
-                   if (_nodeIDs.length) {
-                       // If we're only straightenting between two points, we only need that extent visible
-                       _extent = utilTotalExtent(_nodeIDs, context.graph());
-                   }
+           jsonpCache[c] = function (data) {
+             if (jsonpCache[c]) {
+               callback(data);
+             }
 
-                   _geometry = _wayIDs.length === 1 ? 'line' : 'lines';
-                   return actionStraightenWay(selectedIDs, context.projection);
-               }
+             finalize();
+           };
 
-               return null;
+           function finalize() {
+             delete jsonpCache[c];
+             script.remove();
            }
 
+           request.abort = finalize;
+           return 'jsonpCache.' + c;
+         }
 
-           function operation() {
-               if (!_action) return;
+         var cb = create(url);
+         var script = select('head').append('script').attr('type', 'text/javascript').attr('src', url.replace(/(\{|%7B)callback(\}|%7D)/, cb));
+         return request;
+       }
 
-               context.perform(_action, operation.annotation());
+       var bubbleApi = 'https://dev.virtualearth.net/mapcontrol/HumanScaleServices/GetBubbles.ashx?';
+       var streetsideImagesApi = 'https://t.ssl.ak.tiles.virtualearth.net/tiles/';
+       var bubbleAppKey = 'AuftgJsO0Xs8Ts4M1xZUQJQXJNsvmh3IV8DkNieCiy3tCwCUMq76-WpkrBtNAuEm';
+       var pannellumViewerCSS = 'pannellum-streetside/pannellum.css';
+       var pannellumViewerJS = 'pannellum-streetside/pannellum.js';
+       var maxResults$2 = 2000;
+       var tileZoom$2 = 16.5;
+       var tiler$6 = utilTiler().zoomExtent([tileZoom$2, tileZoom$2]).skipNullIsland(true);
+       var dispatch$7 = dispatch('loadedImages', 'viewerChanged');
+       var minHfov = 10; // zoom in degrees:  20, 10, 5
 
-               window.setTimeout(function() {
-                   context.validator().validate();
-               }, 300);  // after any transition
-           }
+       var maxHfov = 90; // zoom out degrees
 
+       var defaultHfov = 45;
+       var _hires = false;
+       var _resolution = 512; // higher numbers are slower - 512, 1024, 2048, 4096
 
-           operation.available = function() {
-               return Boolean(_action);
-           };
+       var _currScene = 0;
 
+       var _ssCache;
 
-           operation.disabled = function() {
-               var reason = _action.disabled(context.graph());
-               if (reason) {
-                   return reason;
-               } else if (_extent.percentContainedIn(context.map().extent()) < 0.8) {
-                   return 'too_large';
-               } else if (someMissing()) {
-                   return 'not_downloaded';
-               } else if (selectedIDs.some(context.hasHiddenConnections)) {
-                   return 'connected_to_hidden';
-               }
+       var _pannellumViewer;
 
-               return false;
+       var _sceneOptions = {
+         showFullscreenCtrl: false,
+         autoLoad: true,
+         compass: true,
+         yaw: 0,
+         minHfov: minHfov,
+         maxHfov: maxHfov,
+         hfov: defaultHfov,
+         type: 'cubemap',
+         cubeMap: []
+       };
 
+       var _loadViewerPromise$2;
+       /**
+        * abortRequest().
+        */
 
-               function someMissing() {
-                   if (context.inIntro()) return false;
-                   var osm = context.connection();
-                   if (osm) {
-                       var missing = _coords.filter(function(loc) { return !osm.isDataLoaded(loc); });
-                       if (missing.length) {
-                           missing.forEach(function(loc) { context.loadTileAtLoc(loc); });
-                           return true;
-                       }
-                   }
-                   return false;
-               }
-           };
 
+       function abortRequest$6(i) {
+         i.abort();
+       }
+       /**
+        * localeTimeStamp().
+        */
 
-           operation.tooltip = function() {
-               var disable = operation.disabled();
-               return disable ?
-                   _t('operations.straighten.' + disable + '.' + _amount) :
-                   _t('operations.straighten.description.' + _geometry);
-           };
 
+       function localeTimestamp(s) {
+         if (!s) return null;
+         var options = {
+           day: 'numeric',
+           month: 'short',
+           year: 'numeric'
+         };
+         var d = new Date(s);
+         if (isNaN(d.getTime())) return null;
+         return d.toLocaleString(_mainLocalizer.localeCode(), options);
+       }
+       /**
+        * loadTiles() wraps the process of generating tiles and then fetching image points for each tile.
+        */
 
-           operation.annotation = function() {
-               return _t('operations.straighten.annotation.' + _geometry);
-           };
 
+       function loadTiles$2(which, url, projection, margin) {
+         var tiles = tiler$6.margin(margin).getTiles(projection); // abort inflight requests that are no longer needed
 
-           operation.id = 'straighten';
-           operation.keys = [_t('operations.straighten.key')];
-           operation.title = _t('operations.straighten.title');
-           operation.behavior = behaviorOperation(context).which(operation);
+         var cache = _ssCache[which];
+         Object.keys(cache.inflight).forEach(function (k) {
+           var wanted = tiles.find(function (tile) {
+             return k.indexOf(tile.id + ',') === 0;
+           });
 
-           return operation;
+           if (!wanted) {
+             abortRequest$6(cache.inflight[k]);
+             delete cache.inflight[k];
+           }
+         });
+         tiles.forEach(function (tile) {
+           return loadNextTilePage$2(which, url, tile);
+         });
        }
+       /**
+        * loadNextTilePage() load data for the next tile page in line.
+        */
 
-       var Operations = /*#__PURE__*/Object.freeze({
-               __proto__: null,
-               operationCircularize: operationCircularize,
-               operationContinue: operationContinue,
-               operationCopy: operationCopy,
-               operationDelete: operationDelete,
-               operationDisconnect: operationDisconnect,
-               operationDowngrade: operationDowngrade,
-               operationExtract: operationExtract,
-               operationMerge: operationMerge,
-               operationMove: operationMove,
-               operationOrthogonalize: operationOrthogonalize,
-               operationPaste: operationPaste,
-               operationReflectShort: operationReflectShort,
-               operationReflectLong: operationReflectLong,
-               operationReverse: operationReverse,
-               operationRotate: operationRotate,
-               operationSplit: operationSplit,
-               operationStraighten: operationStraighten
-       });
 
-       var _relatedParent;
+       function loadNextTilePage$2(which, url, tile) {
+         var cache = _ssCache[which];
+         var nextPage = cache.nextPage[tile.id] || 0;
+         var id = tile.id + ',' + String(nextPage);
+         if (cache.loaded[id] || cache.inflight[id]) return;
+         cache.inflight[id] = getBubbles(url, tile, function (bubbles) {
+           cache.loaded[id] = true;
+           delete cache.inflight[id];
+           if (!bubbles) return; // [].shift() removes the first element, some statistics info, not a bubble point
 
+           bubbles.shift();
+           var features = bubbles.map(function (bubble) {
+             if (cache.points[bubble.id]) return null; // skip duplicates
 
-       function modeSelect(context, selectedIDs) {
-           var mode = {
-               id: 'select',
-               button: 'browse'
-           };
+             var loc = [bubble.lo, bubble.la];
+             var d = {
+               loc: loc,
+               key: bubble.id,
+               ca: bubble.he,
+               captured_at: bubble.cd,
+               captured_by: 'microsoft',
+               // nbn: bubble.nbn,
+               // pbn: bubble.pbn,
+               // ad: bubble.ad,
+               // rn: bubble.rn,
+               pr: bubble.pr,
+               // previous
+               ne: bubble.ne,
+               // next
+               pano: true,
+               sequenceKey: null
+             };
+             cache.points[bubble.id] = d; // a sequence starts here
 
-           var keybinding = utilKeybinding('select');
+             if (bubble.pr === undefined) {
+               cache.leaders.push(bubble.id);
+             }
 
-           var _breatheBehavior = behaviorBreathe();
-           var _modeDragNode = modeDragNode(context);
-           var _selectBehavior;
-           var _behaviors = [];
+             return {
+               minX: loc[0],
+               minY: loc[1],
+               maxX: loc[0],
+               maxY: loc[1],
+               data: d
+             };
+           }).filter(Boolean);
+           cache.rtree.load(features);
+           connectSequences();
 
-           var _operations = [];
-           var _newFeature = false;
-           var _follow = false;
+           if (which === 'bubbles') {
+             dispatch$7.call('loadedImages');
+           }
+         });
+       } // call this sometimes to connect the bubbles into sequences
 
 
-           function singular() {
-               if (selectedIDs && selectedIDs.length === 1) {
-                   return context.hasEntity(selectedIDs[0]);
-               }
-           }
+       function connectSequences() {
+         var cache = _ssCache.bubbles;
+         var keepLeaders = [];
 
-           function selectedEntities() {
-               return selectedIDs.map(function(id) {
-                   return context.hasEntity(id);
-               }).filter(Boolean);
-           }
+         for (var i = 0; i < cache.leaders.length; i++) {
+           var bubble = cache.points[cache.leaders[i]];
+           var seen = {}; // try to make a sequence.. use the key of the leader bubble.
 
+           var sequence = {
+             key: bubble.key,
+             bubbles: []
+           };
+           var complete = false;
 
-           function checkSelectedIDs() {
-               var ids = [];
-               if (Array.isArray(selectedIDs)) {
-                   ids = selectedIDs.filter(function(id) {
-                       return context.hasEntity(id);
-                   });
-               }
+           do {
+             sequence.bubbles.push(bubble);
+             seen[bubble.key] = true;
 
-               if (!ids.length) {
-                   context.enter(modeBrowse(context));
-                   return false;
-               } else if ((selectedIDs.length > 1 && ids.length === 1) ||
-                   (selectedIDs.length === 1 && ids.length > 1)) {
-                   // switch between single- and multi-select UI
-                   context.enter(modeSelect(context, ids));
-                   return false;
-               }
+             if (bubble.ne === undefined) {
+               complete = true;
+             } else {
+               bubble = cache.points[bubble.ne]; // advance to next
+             }
+           } while (bubble && !seen[bubble.key] && !complete);
 
-               selectedIDs = ids;
-               return true;
-           }
+           if (complete) {
+             _ssCache.sequences[sequence.key] = sequence; // assign bubbles to the sequence
 
+             for (var j = 0; j < sequence.bubbles.length; j++) {
+               sequence.bubbles[j].sequenceKey = sequence.key;
+             } // create a GeoJSON LineString
 
-           // find the common parent ways for nextVertex, previousVertex
-           function commonParents() {
-               var graph = context.graph();
-               var commonParents = [];
 
-               for (var i = 0; i < selectedIDs.length; i++) {
-                   var entity = context.hasEntity(selectedIDs[i]);
-                   if (!entity || entity.geometry(graph) !== 'vertex') {
-                       return [];  // selection includes some not vertexes
-                   }
+             sequence.geojson = {
+               type: 'LineString',
+               properties: {
+                 captured_at: sequence.bubbles[0] ? sequence.bubbles[0].captured_at : null,
+                 captured_by: sequence.bubbles[0] ? sequence.bubbles[0].captured_by : null,
+                 key: sequence.key
+               },
+               coordinates: sequence.bubbles.map(function (d) {
+                 return d.loc;
+               })
+             };
+           } else {
+             keepLeaders.push(cache.leaders[i]);
+           }
+         } // couldn't complete these, save for later
 
-                   var currParents = graph.parentWays(entity).map(function(w) { return w.id; });
-                   if (!commonParents.length) {
-                       commonParents = currParents;
-                       continue;
-                   }
 
-                   commonParents = utilArrayIntersection(commonParents, currParents);
-                   if (!commonParents.length) {
-                       return [];
-                   }
-               }
+         cache.leaders = keepLeaders;
+       }
+       /**
+        * getBubbles() handles the request to the server for a tile extent of 'bubbles' (streetside image locations).
+        */
+
 
-               return commonParents;
+       function getBubbles(url, tile, callback) {
+         var rect = tile.extent.rectangle();
+         var urlForRequest = url + utilQsString({
+           n: rect[3],
+           s: rect[1],
+           e: rect[2],
+           w: rect[0],
+           c: maxResults$2,
+           appkey: bubbleAppKey,
+           jsCallback: '{callback}'
+         });
+         return jsonpRequest(urlForRequest, function (data) {
+           if (!data || data.error) {
+             callback(null);
+           } else {
+             callback(data);
            }
+         });
+       } // partition viewport into higher zoom tiles
 
 
-           function singularParent() {
-               var parents = commonParents();
-               if (!parents || parents.length === 0) {
-                   _relatedParent = null;
-                   return null;
-               }
+       function partitionViewport$2(projection) {
+         var z = geoScaleToZoom(projection.scale());
+         var z2 = Math.ceil(z * 2) / 2 + 2.5; // round to next 0.5 and add 2.5
 
-               // relatedParent is used when we visit a vertex with multiple
-               // parents, and we want to remember which parent line we started on.
+         var tiler = utilTiler().zoomExtent([z2, z2]);
+         return tiler.getTiles(projection).map(function (tile) {
+           return tile.extent;
+         });
+       } // no more than `limit` results per partition.
 
-               if (parents.length === 1) {
-                   _relatedParent = parents[0];  // remember this parent for later
-                   return _relatedParent;
-               }
 
-               if (parents.indexOf(_relatedParent) !== -1) {
-                   return _relatedParent;   // prefer the previously seen parent
-               }
+       function searchLimited$2(limit, projection, rtree) {
+         limit = limit || 5;
+         return partitionViewport$2(projection).reduce(function (result, extent) {
+           var found = rtree.search(extent.bbox()).slice(0, limit).map(function (d) {
+             return d.data;
+           });
+           return found.length ? result.concat(found) : result;
+         }, []);
+       }
+       /**
+        * loadImage()
+        */
 
-               return parents[0];
-           }
 
+       function loadImage(imgInfo) {
+         return new Promise(function (resolve) {
+           var img = new Image();
 
-           mode.selectedIDs = function(val) {
-               if (!arguments.length) return selectedIDs;
-               selectedIDs = val;
-               return mode;
+           img.onload = function () {
+             var canvas = document.getElementById('ideditor-canvas' + imgInfo.face);
+             var ctx = canvas.getContext('2d');
+             ctx.drawImage(img, imgInfo.x, imgInfo.y);
+             resolve({
+               imgInfo: imgInfo,
+               status: 'ok'
+             });
            };
 
-
-           mode.zoomToSelected = function() {
-               context.map().zoomToEase(selectedEntities());
+           img.onerror = function () {
+             resolve({
+               data: imgInfo,
+               status: 'error'
+             });
            };
 
+           img.setAttribute('crossorigin', '');
+           img.src = imgInfo.url;
+         });
+       }
+       /**
+        * loadCanvas()
+        */
+
 
-           mode.newFeature = function(val) {
-               if (!arguments.length) return _newFeature;
-               _newFeature = val;
-               return mode;
+       function loadCanvas(imageGroup) {
+         return Promise.all(imageGroup.map(loadImage)).then(function (data) {
+           var canvas = document.getElementById('ideditor-canvas' + data[0].imgInfo.face);
+           var which = {
+             '01': 0,
+             '02': 1,
+             '03': 2,
+             '10': 3,
+             '11': 4,
+             '12': 5
+           };
+           var face = data[0].imgInfo.face;
+           _sceneOptions.cubeMap[which[face]] = canvas.toDataURL('image/jpeg', 1.0);
+           return {
+             status: 'loadCanvas for face ' + data[0].imgInfo.face + 'ok'
            };
+         });
+       }
+       /**
+        * loadFaces()
+        */
 
 
-           mode.selectBehavior = function(val) {
-               if (!arguments.length) return _selectBehavior;
-               _selectBehavior = val;
-               return mode;
+       function loadFaces(faceGroup) {
+         return Promise.all(faceGroup.map(loadCanvas)).then(function () {
+           return {
+             status: 'loadFaces done'
            };
+         });
+       }
 
+       function setupCanvas(selection, reset) {
+         if (reset) {
+           selection.selectAll('#ideditor-stitcher-canvases').remove();
+         } // Add the Streetside working canvases. These are used for 'stitching', or combining,
+         // multiple images for each of the six faces, before passing to the Pannellum control as DataUrls
 
-           mode.follow = function(val) {
-               if (!arguments.length) return _follow;
-               _follow = val;
-               return mode;
-           };
 
-           function loadOperations() {
+         selection.selectAll('#ideditor-stitcher-canvases').data([0]).enter().append('div').attr('id', 'ideditor-stitcher-canvases').attr('display', 'none').selectAll('canvas').data(['canvas01', 'canvas02', 'canvas03', 'canvas10', 'canvas11', 'canvas12']).enter().append('canvas').attr('id', function (d) {
+           return 'ideditor-' + d;
+         }).attr('width', _resolution).attr('height', _resolution);
+       }
 
-               _operations.forEach(function(operation) {
-                   if (operation.behavior) {
-                       context.uninstall(operation.behavior);
-                   }
-               });
+       function qkToXY(qk) {
+         var x = 0;
+         var y = 0;
+         var scale = 256;
+
+         for (var i = qk.length; i > 0; i--) {
+           var key = qk[i - 1];
+           x += +(key === '1' || key === '3') * scale;
+           y += +(key === '2' || key === '3') * scale;
+           scale *= 2;
+         }
+
+         return [x, y];
+       }
 
-               _operations = Object.values(Operations)
-                   .map(function(o) { return o(context, selectedIDs); })
-                   .filter(function(o) { return o.available() && o.id !== 'delete' && o.id !== 'downgrade' && o.id !== 'copy'; });
+       function getQuadKeys() {
+         var dim = _resolution / 256;
+         var quadKeys;
 
-               var copyOperation = operationCopy(context, selectedIDs);
-               if (copyOperation.available()) {
-                   // group copy operation with delete/downgrade
-                   _operations.push(copyOperation);
-               }
+         if (dim === 16) {
+           quadKeys = ['0000', '0001', '0010', '0011', '0100', '0101', '0110', '0111', '1000', '1001', '1010', '1011', '1100', '1101', '1110', '1111', '0002', '0003', '0012', '0013', '0102', '0103', '0112', '0113', '1002', '1003', '1012', '1013', '1102', '1103', '1112', '1113', '0020', '0021', '0030', '0031', '0120', '0121', '0130', '0131', '1020', '1021', '1030', '1031', '1120', '1121', '1130', '1131', '0022', '0023', '0032', '0033', '0122', '0123', '0132', '0133', '1022', '1023', '1032', '1033', '1122', '1123', '1132', '1133', '0200', '0201', '0210', '0211', '0300', '0301', '0310', '0311', '1200', '1201', '1210', '1211', '1300', '1301', '1310', '1311', '0202', '0203', '0212', '0213', '0302', '0303', '0312', '0313', '1202', '1203', '1212', '1213', '1302', '1303', '1312', '1313', '0220', '0221', '0230', '0231', '0320', '0321', '0330', '0331', '1220', '1221', '1230', '1231', '1320', '1321', '1330', '1331', '0222', '0223', '0232', '0233', '0322', '0323', '0332', '0333', '1222', '1223', '1232', '1233', '1322', '1323', '1332', '1333', '2000', '2001', '2010', '2011', '2100', '2101', '2110', '2111', '3000', '3001', '3010', '3011', '3100', '3101', '3110', '3111', '2002', '2003', '2012', '2013', '2102', '2103', '2112', '2113', '3002', '3003', '3012', '3013', '3102', '3103', '3112', '3113', '2020', '2021', '2030', '2031', '2120', '2121', '2130', '2131', '3020', '3021', '3030', '3031', '3120', '3121', '3130', '3131', '2022', '2023', '2032', '2033', '2122', '2123', '2132', '2133', '3022', '3023', '3032', '3033', '3122', '3123', '3132', '3133', '2200', '2201', '2210', '2211', '2300', '2301', '2310', '2311', '3200', '3201', '3210', '3211', '3300', '3301', '3310', '3311', '2202', '2203', '2212', '2213', '2302', '2303', '2312', '2313', '3202', '3203', '3212', '3213', '3302', '3303', '3312', '3313', '2220', '2221', '2230', '2231', '2320', '2321', '2330', '2331', '3220', '3221', '3230', '3231', '3320', '3321', '3330', '3331', '2222', '2223', '2232', '2233', '2322', '2323', '2332', '2333', '3222', '3223', '3232', '3233', '3322', '3323', '3332', '3333'];
+         } else if (dim === 8) {
+           quadKeys = ['000', '001', '010', '011', '100', '101', '110', '111', '002', '003', '012', '013', '102', '103', '112', '113', '020', '021', '030', '031', '120', '121', '130', '131', '022', '023', '032', '033', '122', '123', '132', '133', '200', '201', '210', '211', '300', '301', '310', '311', '202', '203', '212', '213', '302', '303', '312', '313', '220', '221', '230', '231', '320', '321', '330', '331', '222', '223', '232', '233', '322', '323', '332', '333'];
+         } else if (dim === 4) {
+           quadKeys = ['00', '01', '10', '11', '02', '03', '12', '13', '20', '21', '30', '31', '22', '23', '32', '33'];
+         } else {
+           // dim === 2
+           quadKeys = ['0', '1', '2', '3'];
+         }
 
-               var downgradeOperation = operationDowngrade(context, selectedIDs);
-               // don't allow delete if downgrade is available
-               var lastOperation = !context.inIntro() && downgradeOperation.available() ? downgradeOperation : operationDelete(context, selectedIDs);
+         return quadKeys;
+       }
 
-               _operations.push(lastOperation);
+       var serviceStreetside = {
+         /**
+          * init() initialize streetside.
+          */
+         init: function init() {
+           if (!_ssCache) {
+             this.reset();
+           }
 
-               _operations.forEach(function(operation) {
-                   if (operation.behavior) {
-                       context.install(operation.behavior);
-                   }
-               });
+           this.event = utilRebind(this, dispatch$7, 'on');
+         },
 
-               // remove any displayed menu
-               context.ui().closeEditMenu();
+         /**
+          * reset() reset the cache.
+          */
+         reset: function reset() {
+           if (_ssCache) {
+             Object.values(_ssCache.bubbles.inflight).forEach(abortRequest$6);
            }
 
-           mode.operations = function() {
-               return _operations;
+           _ssCache = {
+             bubbles: {
+               inflight: {},
+               loaded: {},
+               nextPage: {},
+               rtree: new RBush(),
+               points: {},
+               leaders: []
+             },
+             sequences: {}
            };
+         },
 
+         /**
+          * bubbles()
+          */
+         bubbles: function bubbles(projection) {
+           var limit = 5;
+           return searchLimited$2(limit, projection, _ssCache.bubbles.rtree);
+         },
+         cachedImage: function cachedImage(imageKey) {
+           return _ssCache.bubbles.points[imageKey];
+         },
+         sequences: function sequences(projection) {
+           var viewport = projection.clipExtent();
+           var min = [viewport[0][0], viewport[1][1]];
+           var max = [viewport[1][0], viewport[0][1]];
+           var bbox = geoExtent(projection.invert(min), projection.invert(max)).bbox();
+           var seen = {};
+           var results = []; // all sequences for bubbles in viewport
 
-           mode.enter = function() {
-               if (!checkSelectedIDs()) return;
-
-               context.features().forceVisible(selectedIDs);
-
-               _modeDragNode.restoreSelectedIDs(selectedIDs);
-
-               loadOperations();
-
-               if (!_behaviors.length) {
-                   if (!_selectBehavior) _selectBehavior = behaviorSelect(context);
-
-                   _behaviors = [
-                       behaviorPaste(context),
-                       _breatheBehavior,
-                       behaviorHover(context).on('hover', context.ui().sidebar.hoverModeSelect),
-                       _selectBehavior,
-                       behaviorLasso(context),
-                       _modeDragNode.behavior,
-                       modeDragNote(context).behavior
-                   ];
-               }
-               _behaviors.forEach(context.install);
-
-               keybinding
-                   .on(_t('inspector.zoom_to.key'), mode.zoomToSelected)
-                   .on(['[', 'pgup'], previousVertex)
-                   .on([']', 'pgdown'], nextVertex)
-                   .on(['{', uiCmd('⌘['), 'home'], firstVertex)
-                   .on(['}', uiCmd('⌘]'), 'end'], lastVertex)
-                   .on(uiCmd('⇧←'), nudgeSelection([-10, 0]))
-                   .on(uiCmd('⇧↑'), nudgeSelection([0, -10]))
-                   .on(uiCmd('⇧→'), nudgeSelection([10, 0]))
-                   .on(uiCmd('⇧↓'), nudgeSelection([0, 10]))
-                   .on(uiCmd('⇧⌘←'), nudgeSelection([-100, 0]))
-                   .on(uiCmd('⇧⌘↑'), nudgeSelection([0, -100]))
-                   .on(uiCmd('⇧⌘→'), nudgeSelection([100, 0]))
-                   .on(uiCmd('⇧⌘↓'), nudgeSelection([0, 100]))
-                   .on(['\\', 'pause'], nextParent)
-                   .on('⎋', esc, true);
-
-               select(document)
-                   .call(keybinding);
-
-               context.ui().sidebar
-                   .select(selectedIDs, _newFeature);
-
-               context.history()
-                   .on('change.select', function() {
-                       loadOperations();
-                       // reselect after change in case relation members were removed or added
-                       selectElements();
-                   })
-                   .on('undone.select', checkSelectedIDs)
-                   .on('redone.select', checkSelectedIDs);
-
-               context.map()
-                   .on('drawn.select', selectElements)
-                   .on('crossEditableZoom.select', function() {
-                       selectElements();
-                       _breatheBehavior.restartIfNeeded(context.surface());
-                   });
+           _ssCache.bubbles.rtree.search(bbox).forEach(function (d) {
+             var key = d.data.sequenceKey;
 
-               context.map().doubleUpHandler()
-                   .on('doubleUp.modeSelect', didDoubleUp);
+             if (key && !seen[key]) {
+               seen[key] = true;
+               results.push(_ssCache.sequences[key].geojson);
+             }
+           });
 
+           return results;
+         },
 
-               selectElements();
+         /**
+          * loadBubbles()
+          */
+         loadBubbles: function loadBubbles(projection, margin) {
+           // by default: request 2 nearby tiles so we can connect sequences.
+           if (margin === undefined) margin = 2;
+           loadTiles$2('bubbles', bubbleApi, projection, margin);
+         },
+         viewer: function viewer() {
+           return _pannellumViewer;
+         },
+         initViewer: function initViewer() {
+           if (!window.pannellum) return;
+           if (_pannellumViewer) return;
+           _currScene += 1;
 
-               if (_follow) {
-                   var extent = geoExtent();
-                   var graph = context.graph();
-                   selectedIDs.forEach(function(id) {
-                       var entity = context.entity(id);
-                       extent._extend(entity.extent(graph));
-                   });
+           var sceneID = _currScene.toString();
 
-                   var loc = extent.center();
-                   context.map().centerEase(loc);
-               }
+           var options = {
+             'default': {
+               firstScene: sceneID
+             },
+             scenes: {}
+           };
+           options.scenes[sceneID] = _sceneOptions;
+           _pannellumViewer = window.pannellum.viewer('ideditor-viewer-streetside', options);
+         },
+         ensureViewerLoaded: function ensureViewerLoaded(context) {
+           if (_loadViewerPromise$2) return _loadViewerPromise$2; // create ms-wrapper, a photo wrapper class
 
+           var wrap = context.container().select('.photoviewer').selectAll('.ms-wrapper').data([0]); // inject ms-wrapper into the photoviewer div
+           // (used by all to house each custom photo viewer)
 
-               function nudgeSelection(delta) {
-                   return function() {
-                       // prevent nudging during low zoom selection
-                       if (!context.map().withinEditableZoom()) return;
+           var wrapEnter = wrap.enter().append('div').attr('class', 'photo-wrapper ms-wrapper').classed('hide', true);
+           var that = this;
+           var pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse'; // inject div to support streetside viewer (pannellum) and attribution line
 
-                       var moveOp = operationMove(context, selectedIDs);
-                       if (moveOp.disabled()) {
-                           context.ui().flash
-                               .duration(4000)
-                               .iconName('#iD-operation-' + moveOp.id)
-                               .iconClass('operation disabled')
-                               .text(moveOp.tooltip)();
-                       } else {
-                           context.perform(actionMove(selectedIDs, delta, context.projection), moveOp.annotation());
-                       }
-                   };
-               }
+           wrapEnter.append('div').attr('id', 'ideditor-viewer-streetside').on(pointerPrefix + 'down.streetside', function () {
+             select(window).on(pointerPrefix + 'move.streetside', function () {
+               dispatch$7.call('viewerChanged');
+             }, true);
+           }).on(pointerPrefix + 'up.streetside pointercancel.streetside', function () {
+             select(window).on(pointerPrefix + 'move.streetside', null); // continue dispatching events for a few seconds, in case viewer has inertia.
 
+             var t = timer(function (elapsed) {
+               dispatch$7.call('viewerChanged');
 
-               function didDoubleUp(loc) {
-                   if (!context.map().withinEditableZoom()) return;
+               if (elapsed > 2000) {
+                 t.stop();
+               }
+             });
+           }).append('div').attr('class', 'photo-attribution fillD');
+           var controlsEnter = wrapEnter.append('div').attr('class', 'photo-controls-wrap').append('div').attr('class', 'photo-controls');
+           controlsEnter.append('button').on('click.back', step(-1)).html('◄');
+           controlsEnter.append('button').on('click.forward', step(1)).html('►'); // create working canvas for stitching together images
 
-                   var target = select(event.target);
+           wrap = wrap.merge(wrapEnter).call(setupCanvas, true); // Register viewer resize handler
 
-                   var datum = target.datum();
-                   var entity = datum && datum.properties && datum.properties.entity;
-                   if (!entity) return;
+           context.ui().photoviewer.on('resize.streetside', function () {
+             if (_pannellumViewer) {
+               _pannellumViewer.resize();
+             }
+           });
+           _loadViewerPromise$2 = new Promise(function (resolve, reject) {
+             var loadedCount = 0;
 
-                   if (entity instanceof osmWay && target.classed('target')) {
-                       var choice = geoChooseEdge(context.graph().childNodes(entity), loc, context.projection);
-                       var prev = entity.nodes[choice.index - 1];
-                       var next = entity.nodes[choice.index];
+             function loaded() {
+               loadedCount += 1; // wait until both files are loaded
 
-                       context.perform(
-                           actionAddMidpoint({ loc: choice.loc, edge: [prev, next] }, osmNode()),
-                           _t('operations.add.annotation.vertex')
-                       );
+               if (loadedCount === 2) resolve();
+             }
 
-                   } else if (entity.type === 'midpoint') {
-                       context.perform(
-                           actionAddMidpoint({ loc: entity.loc, edge: entity.edge }, osmNode()),
-                           _t('operations.add.annotation.vertex'));
-                   }
-               }
+             var head = select('head'); // load streetside pannellum viewer css
 
+             head.selectAll('#ideditor-streetside-viewercss').data([0]).enter().append('link').attr('id', 'ideditor-streetside-viewercss').attr('rel', 'stylesheet').attr('crossorigin', 'anonymous').attr('href', context.asset(pannellumViewerCSS)).on('load.serviceStreetside', loaded).on('error.serviceStreetside', function () {
+               reject();
+             }); // load streetside pannellum viewer js
 
-               function selectElements() {
-                   if (!checkSelectedIDs()) return;
+             head.selectAll('#ideditor-streetside-viewerjs').data([0]).enter().append('script').attr('id', 'ideditor-streetside-viewerjs').attr('crossorigin', 'anonymous').attr('src', context.asset(pannellumViewerJS)).on('load.serviceStreetside', loaded).on('error.serviceStreetside', function () {
+               reject();
+             });
+           })["catch"](function () {
+             _loadViewerPromise$2 = null;
+           });
+           return _loadViewerPromise$2;
 
-                   var surface = context.surface();
+           function step(stepBy) {
+             return function () {
+               var viewer = context.container().select('.photoviewer');
+               var selected = viewer.empty() ? undefined : viewer.datum();
+               if (!selected) return;
+               var nextID = stepBy === 1 ? selected.ne : selected.pr;
 
-                   surface.selectAll('.selected-member')
-                       .classed('selected-member', false);
+               var yaw = _pannellumViewer.getYaw();
 
-                   surface.selectAll('.selected')
-                       .classed('selected', false);
+               var ca = selected.ca + yaw;
+               var origin = selected.loc; // construct a search trapezoid pointing out from current bubble
 
-                   surface.selectAll('.related')
-                       .classed('related', false);
+               var meters = 35;
+               var p1 = [origin[0] + geoMetersToLon(meters / 5, origin[1]), origin[1]];
+               var p2 = [origin[0] + geoMetersToLon(meters / 2, origin[1]), origin[1] + geoMetersToLat(meters)];
+               var p3 = [origin[0] - geoMetersToLon(meters / 2, origin[1]), origin[1] + geoMetersToLat(meters)];
+               var p4 = [origin[0] - geoMetersToLon(meters / 5, origin[1]), origin[1]];
+               var poly = [p1, p2, p3, p4, p1]; // rotate it to face forward/backward
 
-                   singularParent();
-                   if (_relatedParent) {
-                       surface.selectAll(utilEntitySelector([_relatedParent]))
-                           .classed('related', true);
-                   }
+               var angle = (stepBy === 1 ? ca : ca + 180) * (Math.PI / 180);
+               poly = geoRotate(poly, -angle, origin);
+               var extent = poly.reduce(function (extent, point) {
+                 return extent.extend(geoExtent(point));
+               }, geoExtent()); // find nearest other bubble in the search polygon
 
-                   if (context.map().withinEditableZoom()) {
-                       // Apply selection styling if not in wide selection
+               var minDist = Infinity;
 
-                       surface
-                           .selectAll(utilDeepMemberSelector(selectedIDs, context.graph(), true /* skipMultipolgonMembers */))
-                           .classed('selected-member', true);
-                       surface
-                           .selectAll(utilEntityOrDeepMemberSelector(selectedIDs, context.graph()))
-                           .classed('selected', true);
-                   }
+               _ssCache.bubbles.rtree.search(extent.bbox()).forEach(function (d) {
+                 if (d.data.key === selected.key) return;
+                 if (!geoPointInPolygon(d.data.loc, poly)) return;
+                 var dist = geoVecLength(d.data.loc, selected.loc);
+                 var theta = selected.ca - d.data.ca;
+                 var minTheta = Math.min(Math.abs(theta), 360 - Math.abs(theta));
 
-               }
+                 if (minTheta > 20) {
+                   dist += 5; // penalize distance if camera angles don't match
+                 }
 
+                 if (dist < minDist) {
+                   nextID = d.data.key;
+                   minDist = dist;
+                 }
+               });
 
-               function esc() {
-                   if (context.container().select('.combobox').size()) return;
-                   context.enter(modeBrowse(context));
-               }
+               var nextBubble = nextID && that.cachedImage(nextID);
+               if (!nextBubble) return;
+               context.map().centerEase(nextBubble.loc);
+               that.selectImage(context, nextBubble.key).yaw(yaw).showViewer(context);
+             };
+           }
+         },
+         yaw: function yaw(_yaw) {
+           if (typeof _yaw !== 'number') return _yaw;
+           _sceneOptions.yaw = _yaw;
+           return this;
+         },
 
+         /**
+          * showViewer()
+          */
+         showViewer: function showViewer(context) {
+           var wrap = context.container().select('.photoviewer').classed('hide', false);
+           var isHidden = wrap.selectAll('.photo-wrapper.ms-wrapper.hide').size();
 
-               function firstVertex() {
-                   event.preventDefault();
-                   var entity = singular();
-                   var parent = singularParent();
-                   var way;
+           if (isHidden) {
+             wrap.selectAll('.photo-wrapper:not(.ms-wrapper)').classed('hide', true);
+             wrap.selectAll('.photo-wrapper.ms-wrapper').classed('hide', false);
+           }
 
-                   if (entity && entity.type === 'way') {
-                       way = entity;
-                   } else if (parent) {
-                       way = context.entity(parent);
-                   }
+           return this;
+         },
 
-                   if (way) {
-                       context.enter(
-                           modeSelect(context, [way.first()]).follow(true)
-                       );
-                   }
-               }
+         /**
+          * hideViewer()
+          */
+         hideViewer: function hideViewer(context) {
+           var viewer = context.container().select('.photoviewer');
+           if (!viewer.empty()) viewer.datum(null);
+           viewer.classed('hide', true).selectAll('.photo-wrapper').classed('hide', true);
+           context.container().selectAll('.viewfield-group, .sequence, .icon-sign').classed('currentView', false);
+           this.updateUrlImage(null);
+           return this.setStyles(context, null, true);
+         },
 
+         /**
+          * selectImage().
+          */
+         selectImage: function selectImage(context, key) {
+           var that = this;
+           var d = this.cachedImage(key);
+           var viewer = context.container().select('.photoviewer');
+           if (!viewer.empty()) viewer.datum(d);
+           this.setStyles(context, null, true);
+           var wrap = context.container().select('.photoviewer .ms-wrapper');
+           var attribution = wrap.selectAll('.photo-attribution').html('');
+           wrap.selectAll('.pnlm-load-box') // display "loading.."
+           .style('display', 'block');
+           if (!d) return this;
+           this.updateUrlImage(key);
+           _sceneOptions.northOffset = d.ca;
+           var line1 = attribution.append('div').attr('class', 'attribution-row');
+           var hiresDomId = utilUniqueDomId('streetside-hires'); // Add hires checkbox
+
+           var label = line1.append('label').attr('for', hiresDomId).attr('class', 'streetside-hires');
+           label.append('input').attr('type', 'checkbox').attr('id', hiresDomId).property('checked', _hires).on('click', function (d3_event) {
+             d3_event.stopPropagation();
+             _hires = !_hires;
+             _resolution = _hires ? 1024 : 512;
+             wrap.call(setupCanvas, true);
+             var viewstate = {
+               yaw: _pannellumViewer.getYaw(),
+               pitch: _pannellumViewer.getPitch(),
+               hfov: _pannellumViewer.getHfov()
+             };
+             _sceneOptions = Object.assign(_sceneOptions, viewstate);
+             that.selectImage(context, d.key).showViewer(context);
+           });
+           label.append('span').html(_t.html('streetside.hires'));
+           var captureInfo = line1.append('div').attr('class', 'attribution-capture-info'); // Add capture date
 
-               function lastVertex() {
-                   event.preventDefault();
-                   var entity = singular();
-                   var parent = singularParent();
-                   var way;
+           if (d.captured_by) {
+             var yyyy = new Date().getFullYear();
+             captureInfo.append('a').attr('class', 'captured_by').attr('target', '_blank').attr('href', 'https://www.microsoft.com/en-us/maps/streetside').html('©' + yyyy + ' Microsoft');
+             captureInfo.append('span').html('|');
+           }
 
-                   if (entity && entity.type === 'way') {
-                       way = entity;
-                   } else if (parent) {
-                       way = context.entity(parent);
-                   }
+           if (d.captured_at) {
+             captureInfo.append('span').attr('class', 'captured_at').html(localeTimestamp(d.captured_at));
+           } // Add image links
 
-                   if (way) {
-                       context.enter(
-                           modeSelect(context, [way.last()]).follow(true)
-                       );
-                   }
-               }
 
+           var line2 = attribution.append('div').attr('class', 'attribution-row');
+           line2.append('a').attr('class', 'image-view-link').attr('target', '_blank').attr('href', 'https://www.bing.com/maps?cp=' + d.loc[1] + '~' + d.loc[0] + '&lvl=17&dir=' + d.ca + '&style=x&v=2&sV=1').html(_t.html('streetside.view_on_bing'));
+           line2.append('a').attr('class', 'image-report-link').attr('target', '_blank').attr('href', 'https://www.bing.com/maps/privacyreport/streetsideprivacyreport?bubbleid=' + encodeURIComponent(d.key) + '&focus=photo&lat=' + d.loc[1] + '&lng=' + d.loc[0] + '&z=17').html(_t.html('streetside.report'));
+           var bubbleIdQuadKey = d.key.toString(4);
+           var paddingNeeded = 16 - bubbleIdQuadKey.length;
 
-               function previousVertex() {
-                   event.preventDefault();
-                   var parent = singularParent();
-                   if (!parent) return;
+           for (var i = 0; i < paddingNeeded; i++) {
+             bubbleIdQuadKey = '0' + bubbleIdQuadKey;
+           }
 
-                   var way = context.entity(parent);
-                   var length = way.nodes.length;
-                   var curr = way.nodes.indexOf(selectedIDs[0]);
-                   var index = -1;
+           var imgUrlPrefix = streetsideImagesApi + 'hs' + bubbleIdQuadKey;
+           var imgUrlSuffix = '.jpg?g=6338&n=z'; // Cubemap face code order matters here: front=01, right=02, back=03, left=10, up=11, down=12
 
-                   if (curr > 0) {
-                       index = curr - 1;
-                   } else if (way.isClosed()) {
-                       index = length - 2;
-                   }
+           var faceKeys = ['01', '02', '03', '10', '11', '12']; // Map images to cube faces
 
-                   if (index !== -1) {
-                       context.enter(
-                           modeSelect(context, [way.nodes[index]]).follow(true)
-                       );
-                   }
-               }
+           var quadKeys = getQuadKeys();
+           var faces = faceKeys.map(function (faceKey) {
+             return quadKeys.map(function (quadKey) {
+               var xy = qkToXY(quadKey);
+               return {
+                 face: faceKey,
+                 url: imgUrlPrefix + faceKey + quadKey + imgUrlSuffix,
+                 x: xy[0],
+                 y: xy[1]
+               };
+             });
+           });
+           loadFaces(faces).then(function () {
+             if (!_pannellumViewer) {
+               that.initViewer();
+             } else {
+               // make a new scene
+               _currScene += 1;
 
+               var sceneID = _currScene.toString();
 
-               function nextVertex() {
-                   event.preventDefault();
-                   var parent = singularParent();
-                   if (!parent) return;
+               _pannellumViewer.addScene(sceneID, _sceneOptions).loadScene(sceneID); // remove previous scene
 
-                   var way = context.entity(parent);
-                   var length = way.nodes.length;
-                   var curr = way.nodes.indexOf(selectedIDs[0]);
-                   var index = -1;
 
-                   if (curr < length - 1) {
-                       index = curr + 1;
-                   } else if (way.isClosed()) {
-                       index = 0;
-                   }
+               if (_currScene > 2) {
+                 sceneID = (_currScene - 1).toString();
 
-                   if (index !== -1) {
-                       context.enter(
-                           modeSelect(context, [way.nodes[index]]).follow(true)
-                       );
-                   }
+                 _pannellumViewer.removeScene(sceneID);
                }
+             }
+           });
+           return this;
+         },
+         getSequenceKeyForBubble: function getSequenceKeyForBubble(d) {
+           return d && d.sequenceKey;
+         },
+         // Updates the currently highlighted sequence and selected bubble.
+         // Reset is only necessary when interacting with the viewport because
+         // this implicitly changes the currently selected bubble/sequence
+         setStyles: function setStyles(context, hovered, reset) {
+           if (reset) {
+             // reset all layers
+             context.container().selectAll('.viewfield-group').classed('highlighted', false).classed('hovered', false).classed('currentView', false);
+             context.container().selectAll('.sequence').classed('highlighted', false).classed('currentView', false);
+           }
+
+           var hoveredBubbleKey = hovered && hovered.key;
+           var hoveredSequenceKey = this.getSequenceKeyForBubble(hovered);
+           var hoveredSequence = hoveredSequenceKey && _ssCache.sequences[hoveredSequenceKey];
+           var hoveredBubbleKeys = hoveredSequence && hoveredSequence.bubbles.map(function (d) {
+             return d.key;
+           }) || [];
+           var viewer = context.container().select('.photoviewer');
+           var selected = viewer.empty() ? undefined : viewer.datum();
+           var selectedBubbleKey = selected && selected.key;
+           var selectedSequenceKey = this.getSequenceKeyForBubble(selected);
+           var selectedSequence = selectedSequenceKey && _ssCache.sequences[selectedSequenceKey];
+           var selectedBubbleKeys = selectedSequence && selectedSequence.bubbles.map(function (d) {
+             return d.key;
+           }) || []; // highlight sibling viewfields on either the selected or the hovered sequences
+
+           var highlightedBubbleKeys = utilArrayUnion(hoveredBubbleKeys, selectedBubbleKeys);
+           context.container().selectAll('.layer-streetside-images .viewfield-group').classed('highlighted', function (d) {
+             return highlightedBubbleKeys.indexOf(d.key) !== -1;
+           }).classed('hovered', function (d) {
+             return d.key === hoveredBubbleKey;
+           }).classed('currentView', function (d) {
+             return d.key === selectedBubbleKey;
+           });
+           context.container().selectAll('.layer-streetside-images .sequence').classed('highlighted', function (d) {
+             return d.properties.key === hoveredSequenceKey;
+           }).classed('currentView', function (d) {
+             return d.properties.key === selectedSequenceKey;
+           }); // update viewfields if needed
 
+           context.container().selectAll('.viewfield-group .viewfield').attr('d', viewfieldPath);
 
-               function nextParent() {
-                   event.preventDefault();
-                   var parents = commonParents();
-                   if (!parents || parents.length < 2) return;
+           function viewfieldPath() {
+             var d = this.parentNode.__data__;
 
-                   var index = parents.indexOf(_relatedParent);
-                   if (index < 0 || index > parents.length - 2) {
-                       _relatedParent = parents[0];
-                   } else {
-                       _relatedParent = parents[index + 1];
-                   }
+             if (d.pano && d.key !== selectedBubbleKey) {
+               return 'M 8,13 m -10,0 a 10,10 0 1,0 20,0 a 10,10 0 1,0 -20,0';
+             } else {
+               return 'M 6,9 C 8,8.4 8,8.4 10,9 L 16,-2 C 12,-5 4,-5 0,-2 z';
+             }
+           }
 
-                   var surface = context.surface();
-                   surface.selectAll('.related')
-                       .classed('related', false);
+           return this;
+         },
+         updateUrlImage: function updateUrlImage(imageKey) {
+           if (!window.mocha) {
+             var hash = utilStringQs(window.location.hash);
 
-                   if (_relatedParent) {
-                       surface.selectAll(utilEntitySelector([_relatedParent]))
-                           .classed('related', true);
-                   }
-               }
-           };
+             if (imageKey) {
+               hash.photo = 'streetside/' + imageKey;
+             } else {
+               delete hash.photo;
+             }
 
+             window.location.replace('#' + utilQsString(hash, true));
+           }
+         },
 
-           mode.exit = function() {
+         /**
+          * cache().
+          */
+         cache: function cache() {
+           return _ssCache;
+         }
+       };
 
-               _newFeature = false;
+       var _apibase$1 = 'https://taginfo.openstreetmap.org/api/4/';
+       var _inflight$2 = {};
+       var _popularKeys = {};
+       var _taginfoCache = {};
+       var tag_sorts = {
+         point: 'count_nodes',
+         vertex: 'count_nodes',
+         area: 'count_ways',
+         line: 'count_ways'
+       };
+       var tag_sort_members = {
+         point: 'count_node_members',
+         vertex: 'count_node_members',
+         area: 'count_way_members',
+         line: 'count_way_members',
+         relation: 'count_relation_members'
+       };
+       var tag_filters = {
+         point: 'nodes',
+         vertex: 'nodes',
+         area: 'ways',
+         line: 'ways'
+       };
+       var tag_members_fractions = {
+         point: 'count_node_members_fraction',
+         vertex: 'count_node_members_fraction',
+         area: 'count_way_members_fraction',
+         line: 'count_way_members_fraction',
+         relation: 'count_relation_members_fraction'
+       };
 
-               _operations.forEach(function(operation) {
-                   if (operation.behavior) {
-                       context.uninstall(operation.behavior);
-                   }
-               });
-               _operations = [];
+       function sets(params, n, o) {
+         if (params.geometry && o[params.geometry]) {
+           params[n] = o[params.geometry];
+         }
 
-               _behaviors.forEach(context.uninstall);
+         return params;
+       }
 
-               select(document)
-                   .call(keybinding.unbind);
+       function setFilter(params) {
+         return sets(params, 'filter', tag_filters);
+       }
 
-               context.ui().closeEditMenu();
+       function setSort(params) {
+         return sets(params, 'sortname', tag_sorts);
+       }
 
-               context.history()
-                   .on('change.select', null)
-                   .on('undone.select', null)
-                   .on('redone.select', null);
+       function setSortMembers(params) {
+         return sets(params, 'sortname', tag_sort_members);
+       }
 
-               var surface = context.surface();
+       function clean(params) {
+         return utilObjectOmit(params, ['geometry', 'debounce']);
+       }
 
-               surface
-                   .selectAll('.selected-member')
-                   .classed('selected-member', false);
+       function filterKeys(type) {
+         var count_type = type ? 'count_' + type : 'count_all';
+         return function (d) {
+           return parseFloat(d[count_type]) > 2500 || d.in_wiki;
+         };
+       }
 
-               surface
-                   .selectAll('.selected')
-                   .classed('selected', false);
+       function filterMultikeys(prefix) {
+         return function (d) {
+           // d.key begins with prefix, and d.key contains no additional ':'s
+           var re = new RegExp('^' + prefix + '(.*)$');
+           var matches = d.key.match(re) || [];
+           return matches.length === 2 && matches[1].indexOf(':') === -1;
+         };
+       }
 
-               surface
-                   .selectAll('.highlighted')
-                   .classed('highlighted', false);
+       function filterValues(allowUpperCase) {
+         return function (d) {
+           if (d.value.match(/[;,]/) !== null) return false; // exclude some punctuation
 
-               surface
-                   .selectAll('.related')
-                   .classed('related', false);
+           if (!allowUpperCase && d.value.match(/[A-Z*]/) !== null) return false; // exclude uppercase letters
 
-               context.map().on('drawn.select', null);
-               context.ui().sidebar.hide();
-               context.features().forceVisible([]);
+           return parseFloat(d.fraction) > 0.0;
+         };
+       }
 
-               var entity = singular();
-               if (_newFeature && entity && entity.type === 'relation' &&
-                   // no tags
-                   Object.keys(entity.tags).length === 0 &&
-                   // no parent relations
-                   context.graph().parentRelations(entity).length === 0 &&
-                   // no members or one member with no role
-                   (entity.members.length === 0 || (entity.members.length === 1 && !entity.members[0].role))
-               ) {
-                   // the user added this relation but didn't edit it at all, so just delete it
-                   var deleteAction = actionDeleteRelation(entity.id, true /* don't delete untagged members */);
-                   context.perform(deleteAction, _t('operations.delete.annotation.relation'));
-               }
-           };
+       function filterRoles(geometry) {
+         return function (d) {
+           if (d.role === '') return false; // exclude empty role
 
+           if (d.role.match(/[A-Z*;,]/) !== null) return false; // exclude uppercase letters and some punctuation
 
-           return mode;
+           return parseFloat(d[tag_members_fractions[geometry]]) > 0.0;
+         };
        }
 
-       function uiLasso(context) {
-           var group, polygon;
+       function valKey(d) {
+         return {
+           value: d.key,
+           title: d.key
+         };
+       }
 
-           lasso.coordinates = [];
+       function valKeyDescription(d) {
+         var obj = {
+           value: d.value,
+           title: d.description || d.value
+         };
 
-           function lasso(selection) {
-               context.container()
-                   .classed('lasso', true);
+         if (d.count) {
+           obj.count = d.count;
+         }
 
-               group = selection
-                   .append('g')
-                   .attr('class', 'lasso hide');
+         return obj;
+       }
 
-               polygon = group
-                   .append('path')
-                   .attr('class', 'lasso-path');
+       function roleKey(d) {
+         return {
+           value: d.role,
+           title: d.role
+         };
+       } // sort keys with ':' lower than keys without ':'
 
-               group
-                   .call(uiToggle(true));
-           }
 
+       function sortKeys(a, b) {
+         return a.key.indexOf(':') === -1 && b.key.indexOf(':') !== -1 ? -1 : a.key.indexOf(':') !== -1 && b.key.indexOf(':') === -1 ? 1 : 0;
+       }
 
-           function draw() {
-               if (polygon) {
-                   polygon.data([lasso.coordinates])
-                       .attr('d', function(d) { return 'M' + d.join(' L') + ' Z'; });
-               }
-           }
+       var debouncedRequest$1 = debounce(request$1, 300, {
+         leading: false
+       });
 
+       function request$1(url, params, exactMatch, callback, loaded) {
+         if (_inflight$2[url]) return;
+         if (checkCache(url, params, exactMatch, callback)) return;
+         var controller = new AbortController();
+         _inflight$2[url] = controller;
+         d3_json(url, {
+           signal: controller.signal
+         }).then(function (result) {
+           delete _inflight$2[url];
+           if (loaded) loaded(null, result);
+         })["catch"](function (err) {
+           delete _inflight$2[url];
+           if (err.name === 'AbortError') return;
+           if (loaded) loaded(err.message);
+         });
+       }
 
-           lasso.extent = function () {
-               return lasso.coordinates.reduce(function(extent, point) {
-                   return extent.extend(geoExtent(point));
-               }, geoExtent());
-           };
+       function checkCache(url, params, exactMatch, callback) {
+         var rp = params.rp || 25;
+         var testQuery = params.query || '';
+         var testUrl = url;
 
+         do {
+           var hit = _taginfoCache[testUrl]; // exact match, or shorter match yielding fewer than max results (rp)
 
-           lasso.p = function(_) {
-               if (!arguments.length) return lasso;
-               lasso.coordinates.push(_);
-               draw();
-               return lasso;
-           };
+           if (hit && (url === testUrl || hit.length < rp)) {
+             callback(null, hit);
+             return true;
+           } // don't try to shorten the query
 
 
-           lasso.close = function() {
-               if (group) {
-                   group.call(uiToggle(false, function() {
-                       select(this).remove();
-                   }));
-               }
-               context.container().classed('lasso', false);
-           };
+           if (exactMatch || !testQuery.length) return false; // do shorten the query to see if we already have a cached result
+           // that has returned fewer than max results (rp)
 
+           testQuery = testQuery.slice(0, -1);
+           testUrl = url.replace(/&query=(.*?)&/, '&query=' + testQuery + '&');
+         } while (testQuery.length >= 0);
 
-           return lasso;
+         return false;
        }
 
-       function behaviorLasso(context) {
+       var serviceTaginfo = {
+         init: function init() {
+           _inflight$2 = {};
+           _taginfoCache = {};
+           _popularKeys = {
+             // manually exclude some keys – #5377, #7485
+             postal_code: true,
+             full_name: true,
+             loc_name: true,
+             reg_name: true,
+             short_name: true,
+             sorting_name: true,
+             artist_name: true,
+             nat_name: true,
+             long_name: true,
+             'bridge:name': true
+           }; // Fetch popular keys.  We'll exclude these from `values`
+           // lookups because they stress taginfo, and they aren't likely
+           // to yield meaningful autocomplete results.. see #3955
+
+           var params = {
+             rp: 100,
+             sortname: 'values_all',
+             sortorder: 'desc',
+             page: 1,
+             debounce: false,
+             lang: _mainLocalizer.languageCode()
+           };
+           this.keys(params, function (err, data) {
+             if (err) return;
+             data.forEach(function (d) {
+               if (d.value === 'opening_hours') return; // exception
+
+               _popularKeys[d.value] = true;
+             });
+           });
+         },
+         reset: function reset() {
+           Object.values(_inflight$2).forEach(function (controller) {
+             controller.abort();
+           });
+           _inflight$2 = {};
+         },
+         keys: function keys(params, callback) {
+           var doRequest = params.debounce ? debouncedRequest$1 : request$1;
+           params = clean(setSort(params));
+           params = Object.assign({
+             rp: 10,
+             sortname: 'count_all',
+             sortorder: 'desc',
+             page: 1,
+             lang: _mainLocalizer.languageCode()
+           }, params);
+           var url = _apibase$1 + 'keys/all?' + utilQsString(params);
+           doRequest(url, params, false, callback, function (err, d) {
+             if (err) {
+               callback(err);
+             } else {
+               var f = filterKeys(params.filter);
+               var result = d.data.filter(f).sort(sortKeys).map(valKey);
+               _taginfoCache[url] = result;
+               callback(null, result);
+             }
+           });
+         },
+         multikeys: function multikeys(params, callback) {
+           var doRequest = params.debounce ? debouncedRequest$1 : request$1;
+           params = clean(setSort(params));
+           params = Object.assign({
+             rp: 25,
+             sortname: 'count_all',
+             sortorder: 'desc',
+             page: 1,
+             lang: _mainLocalizer.languageCode()
+           }, params);
+           var prefix = params.query;
+           var url = _apibase$1 + 'keys/all?' + utilQsString(params);
+           doRequest(url, params, true, callback, function (err, d) {
+             if (err) {
+               callback(err);
+             } else {
+               var f = filterMultikeys(prefix);
+               var result = d.data.filter(f).map(valKey);
+               _taginfoCache[url] = result;
+               callback(null, result);
+             }
+           });
+         },
+         values: function values(params, callback) {
+           // Exclude popular keys from values lookups.. see #3955
+           var key = params.key;
 
-           // use pointer events on supported platforms; fallback to mouse events
-           var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
+           if (key && _popularKeys[key]) {
+             callback(null, []);
+             return;
+           }
 
-           var behavior = function(selection) {
-               var lasso;
+           var doRequest = params.debounce ? debouncedRequest$1 : request$1;
+           params = clean(setSort(setFilter(params)));
+           params = Object.assign({
+             rp: 25,
+             sortname: 'count_all',
+             sortorder: 'desc',
+             page: 1,
+             lang: _mainLocalizer.languageCode()
+           }, params);
+           var url = _apibase$1 + 'key/values?' + utilQsString(params);
+           doRequest(url, params, false, callback, function (err, d) {
+             if (err) {
+               callback(err);
+             } else {
+               // In most cases we prefer taginfo value results with lowercase letters.
+               // A few OSM keys expect values to contain uppercase values (see #3377).
+               // This is not an exhaustive list (e.g. `name` also has uppercase values)
+               // but these are the fields where taginfo value lookup is most useful.
+               var re = /network|taxon|genus|species|brand|grape_variety|royal_cypher|listed_status|booth|rating|stars|:output|_hours|_times|_ref|manufacturer|country|target|brewery/;
+               var allowUpperCase = re.test(params.key);
+               var f = filterValues(allowUpperCase);
+               var result = d.data.filter(f).map(valKeyDescription);
+               _taginfoCache[url] = result;
+               callback(null, result);
+             }
+           });
+         },
+         roles: function roles(params, callback) {
+           var doRequest = params.debounce ? debouncedRequest$1 : request$1;
+           var geometry = params.geometry;
+           params = clean(setSortMembers(params));
+           params = Object.assign({
+             rp: 25,
+             sortname: 'count_all_members',
+             sortorder: 'desc',
+             page: 1,
+             lang: _mainLocalizer.languageCode()
+           }, params);
+           var url = _apibase$1 + 'relation/roles?' + utilQsString(params);
+           doRequest(url, params, true, callback, function (err, d) {
+             if (err) {
+               callback(err);
+             } else {
+               var f = filterRoles(geometry);
+               var result = d.data.filter(f).map(roleKey);
+               _taginfoCache[url] = result;
+               callback(null, result);
+             }
+           });
+         },
+         docs: function docs(params, callback) {
+           var doRequest = params.debounce ? debouncedRequest$1 : request$1;
+           params = clean(setSort(params));
+           var path = 'key/wiki_pages?';
 
+           if (params.value) {
+             path = 'tag/wiki_pages?';
+           } else if (params.rtype) {
+             path = 'relation/wiki_pages?';
+           }
 
-               function pointerdown() {
-                   var button = 0;  // left
-                   if (event.button === button && event.shiftKey === true) {
-                       lasso = null;
+           var url = _apibase$1 + path + utilQsString(params);
+           doRequest(url, params, true, callback, function (err, d) {
+             if (err) {
+               callback(err);
+             } else {
+               _taginfoCache[url] = d.data;
+               callback(null, d.data);
+             }
+           });
+         },
+         apibase: function apibase(_) {
+           if (!arguments.length) return _apibase$1;
+           _apibase$1 = _;
+           return this;
+         }
+       };
 
-                       select(window)
-                           .on(_pointerPrefix + 'move.lasso', pointermove)
-                           .on(_pointerPrefix + 'up.lasso', pointerup);
+       var helpers$1 = createCommonjsModule(function (module, exports) {
 
-                       event.stopPropagation();
-                   }
-               }
+         Object.defineProperty(exports, "__esModule", {
+           value: true
+         });
+         /**
+          * @module helpers
+          */
 
+         /**
+          * Earth Radius used with the Harvesine formula and approximates using a spherical (non-ellipsoid) Earth.
+          *
+          * @memberof helpers
+          * @type {number}
+          */
 
-               function pointermove() {
-                   if (!lasso) {
-                       lasso = uiLasso(context);
-                       context.surface().call(lasso);
-                   }
+         exports.earthRadius = 6371008.8;
+         /**
+          * Unit of measurement factors using a spherical (non-ellipsoid) earth radius.
+          *
+          * @memberof helpers
+          * @type {Object}
+          */
 
-                   lasso.p(context.map().mouse());
-               }
+         exports.factors = {
+           centimeters: exports.earthRadius * 100,
+           centimetres: exports.earthRadius * 100,
+           degrees: exports.earthRadius / 111325,
+           feet: exports.earthRadius * 3.28084,
+           inches: exports.earthRadius * 39.370,
+           kilometers: exports.earthRadius / 1000,
+           kilometres: exports.earthRadius / 1000,
+           meters: exports.earthRadius,
+           metres: exports.earthRadius,
+           miles: exports.earthRadius / 1609.344,
+           millimeters: exports.earthRadius * 1000,
+           millimetres: exports.earthRadius * 1000,
+           nauticalmiles: exports.earthRadius / 1852,
+           radians: 1,
+           yards: exports.earthRadius / 1.0936
+         };
+         /**
+          * Units of measurement factors based on 1 meter.
+          *
+          * @memberof helpers
+          * @type {Object}
+          */
 
+         exports.unitsFactors = {
+           centimeters: 100,
+           centimetres: 100,
+           degrees: 1 / 111325,
+           feet: 3.28084,
+           inches: 39.370,
+           kilometers: 1 / 1000,
+           kilometres: 1 / 1000,
+           meters: 1,
+           metres: 1,
+           miles: 1 / 1609.344,
+           millimeters: 1000,
+           millimetres: 1000,
+           nauticalmiles: 1 / 1852,
+           radians: 1 / exports.earthRadius,
+           yards: 1 / 1.0936
+         };
+         /**
+          * Area of measurement factors based on 1 square meter.
+          *
+          * @memberof helpers
+          * @type {Object}
+          */
 
-               function normalize(a, b) {
-                   return [
-                       [Math.min(a[0], b[0]), Math.min(a[1], b[1])],
-                       [Math.max(a[0], b[0]), Math.max(a[1], b[1])]
-                   ];
-               }
+         exports.areaFactors = {
+           acres: 0.000247105,
+           centimeters: 10000,
+           centimetres: 10000,
+           feet: 10.763910417,
+           inches: 1550.003100006,
+           kilometers: 0.000001,
+           kilometres: 0.000001,
+           meters: 1,
+           metres: 1,
+           miles: 3.86e-7,
+           millimeters: 1000000,
+           millimetres: 1000000,
+           yards: 1.195990046
+         };
+         /**
+          * Wraps a GeoJSON {@link Geometry} in a GeoJSON {@link Feature}.
+          *
+          * @name feature
+          * @param {Geometry} geometry input geometry
+          * @param {Object} [properties={}] an Object of key-value pairs to add as properties
+          * @param {Object} [options={}] Optional Parameters
+          * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
+          * @param {string|number} [options.id] Identifier associated with the Feature
+          * @returns {Feature} a GeoJSON Feature
+          * @example
+          * var geometry = {
+          *   "type": "Point",
+          *   "coordinates": [110, 50]
+          * };
+          *
+          * var feature = turf.feature(geometry);
+          *
+          * //=feature
+          */
 
+         function feature(geom, properties, options) {
+           if (options === void 0) {
+             options = {};
+           }
 
-               function lassoed() {
-                   if (!lasso) return [];
+           var feat = {
+             type: "Feature"
+           };
 
-                   var graph = context.graph();
-                   var limitToNodes;
+           if (options.id === 0 || options.id) {
+             feat.id = options.id;
+           }
 
-                   if (context.map().editableDataEnabled(true /* skipZoomCheck */) && context.map().isInWideSelection()) {
-                       // only select from the visible nodes
-                       limitToNodes = new Set(utilGetAllNodes(context.selectedIDs(), graph));
-                   } else if (!context.map().editableDataEnabled()) {
-                       return [];
-                   }
+           if (options.bbox) {
+             feat.bbox = options.bbox;
+           }
 
-                   var bounds = lasso.extent().map(context.projection.invert);
-                   var extent = geoExtent(normalize(bounds[0], bounds[1]));
+           feat.properties = properties || {};
+           feat.geometry = geom;
+           return feat;
+         }
 
-                   var intersects = context.history().intersects(extent).filter(function(entity) {
-                       return entity.type === 'node' &&
-                           (!limitToNodes || limitToNodes.has(entity)) &&
-                           geoPointInPolygon(context.projection(entity.loc), lasso.coordinates) &&
-                           !context.features().isHidden(entity, graph, entity.geometry(graph));
-                   });
+         exports.feature = feature;
+         /**
+          * Creates a GeoJSON {@link Geometry} from a Geometry string type & coordinates.
+          * For GeometryCollection type use `helpers.geometryCollection`
+          *
+          * @name geometry
+          * @param {string} type Geometry Type
+          * @param {Array<any>} coordinates Coordinates
+          * @param {Object} [options={}] Optional Parameters
+          * @returns {Geometry} a GeoJSON Geometry
+          * @example
+          * var type = "Point";
+          * var coordinates = [110, 50];
+          * var geometry = turf.geometry(type, coordinates);
+          * // => geometry
+          */
 
-                   // sort the lassoed nodes as best we can
-                   intersects.sort(function(node1, node2) {
-                       var parents1 = graph.parentWays(node1);
-                       var parents2 = graph.parentWays(node2);
-                       if (parents1.length && parents2.length) {
-                           // both nodes are vertices
-
-                           var sharedParents = utilArrayIntersection(parents1, parents2);
-                           if (sharedParents.length) {
-                               var sharedParentNodes = sharedParents[0].nodes;
-                               // vertices are members of the same way; sort them in their listed order
-                               return sharedParentNodes.indexOf(node1.id) -
-                                   sharedParentNodes.indexOf(node2.id);
-                           } else {
-                               // vertices do not share a way; group them by their respective parent ways
-                               return parseFloat(parents1[0].id.slice(1)) -
-                                   parseFloat(parents2[0].id.slice(1));
-                           }
+         function geometry(type, coordinates, options) {
 
-                       } else if (parents1.length || parents2.length) {
-                           // only one node is a vertex; sort standalone points before vertices
-                           return parents1.length - parents2.length;
-                       }
-                       // both nodes are standalone points; sort left to right
-                       return node1.loc[0] - node2.loc[0];
-                   });
+           switch (type) {
+             case "Point":
+               return point(coordinates).geometry;
 
-                   return intersects.map(function(entity) { return entity.id; });
-               }
+             case "LineString":
+               return lineString(coordinates).geometry;
 
+             case "Polygon":
+               return polygon(coordinates).geometry;
 
-               function pointerup() {
-                   select(window)
-                       .on(_pointerPrefix + 'move.lasso', null)
-                       .on(_pointerPrefix + 'up.lasso', null);
+             case "MultiPoint":
+               return multiPoint(coordinates).geometry;
 
-                   if (!lasso) return;
+             case "MultiLineString":
+               return multiLineString(coordinates).geometry;
 
-                   var ids = lassoed();
-                   lasso.close();
+             case "MultiPolygon":
+               return multiPolygon(coordinates).geometry;
 
-                   if (ids.length) {
-                       context.enter(modeSelect(context, ids));
-                   }
-               }
+             default:
+               throw new Error(type + " is invalid");
+           }
+         }
 
-               selection
-                   .on(_pointerPrefix + 'down.lasso', pointerdown);
-           };
+         exports.geometry = geometry;
+         /**
+          * Creates a {@link Point} {@link Feature} from a Position.
+          *
+          * @name point
+          * @param {Array<number>} coordinates longitude, latitude position (each in decimal degrees)
+          * @param {Object} [properties={}] an Object of key-value pairs to add as properties
+          * @param {Object} [options={}] Optional Parameters
+          * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
+          * @param {string|number} [options.id] Identifier associated with the Feature
+          * @returns {Feature<Point>} a Point feature
+          * @example
+          * var point = turf.point([-75.343, 39.984]);
+          *
+          * //=point
+          */
 
+         function point(coordinates, properties, options) {
+           if (options === void 0) {
+             options = {};
+           }
 
-           behavior.off = function(selection) {
-               selection.on(_pointerPrefix + 'down.lasso', null);
+           var geom = {
+             type: "Point",
+             coordinates: coordinates
            };
+           return feature(geom, properties, options);
+         }
 
+         exports.point = point;
+         /**
+          * Creates a {@link Point} {@link FeatureCollection} from an Array of Point coordinates.
+          *
+          * @name points
+          * @param {Array<Array<number>>} coordinates an array of Points
+          * @param {Object} [properties={}] Translate these properties to each Feature
+          * @param {Object} [options={}] Optional Parameters
+          * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north]
+          * associated with the FeatureCollection
+          * @param {string|number} [options.id] Identifier associated with the FeatureCollection
+          * @returns {FeatureCollection<Point>} Point Feature
+          * @example
+          * var points = turf.points([
+          *   [-75, 39],
+          *   [-80, 45],
+          *   [-78, 50]
+          * ]);
+          *
+          * //=points
+          */
 
-           return behavior;
-       }
-
-       function modeBrowse(context) {
-           var mode = {
-               button: 'browse',
-               id: 'browse',
-               title: _t('modes.browse.title'),
-               description: _t('modes.browse.description')
-           };
-           var sidebar;
+         function points(coordinates, properties, options) {
+           if (options === void 0) {
+             options = {};
+           }
 
-           var _selectBehavior;
-           var _behaviors = [];
+           return featureCollection(coordinates.map(function (coords) {
+             return point(coords, properties);
+           }), options);
+         }
 
+         exports.points = points;
+         /**
+          * Creates a {@link Polygon} {@link Feature} from an Array of LinearRings.
+          *
+          * @name polygon
+          * @param {Array<Array<Array<number>>>} coordinates an array of LinearRings
+          * @param {Object} [properties={}] an Object of key-value pairs to add as properties
+          * @param {Object} [options={}] Optional Parameters
+          * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
+          * @param {string|number} [options.id] Identifier associated with the Feature
+          * @returns {Feature<Polygon>} Polygon Feature
+          * @example
+          * var polygon = turf.polygon([[[-5, 52], [-4, 56], [-2, 51], [-7, 54], [-5, 52]]], { name: 'poly1' });
+          *
+          * //=polygon
+          */
 
-           mode.selectBehavior = function(val) {
-               if (!arguments.length) return _selectBehavior;
-               _selectBehavior = val;
-               return mode;
-           };
+         function polygon(coordinates, properties, options) {
+           if (options === void 0) {
+             options = {};
+           }
 
+           for (var _i = 0, coordinates_1 = coordinates; _i < coordinates_1.length; _i++) {
+             var ring = coordinates_1[_i];
 
-           mode.enter = function() {
-               if (!_behaviors.length) {
-                   if (!_selectBehavior) _selectBehavior = behaviorSelect(context);
-                   _behaviors = [
-                       behaviorPaste(context),
-                       behaviorHover(context).on('hover', context.ui().sidebar.hover),
-                       _selectBehavior,
-                       behaviorLasso(context),
-                       modeDragNode(context).behavior,
-                       modeDragNote(context).behavior
-                   ];
-               }
-               _behaviors.forEach(context.install);
+             if (ring.length < 4) {
+               throw new Error("Each LinearRing of a Polygon must have 4 or more Positions.");
+             }
 
-               // Get focus on the body.
-               if (document.activeElement && document.activeElement.blur) {
-                   document.activeElement.blur();
+             for (var j = 0; j < ring[ring.length - 1].length; j++) {
+               // Check if first point of Polygon contains two numbers
+               if (ring[ring.length - 1][j] !== ring[0][j]) {
+                 throw new Error("First and last Position are not equivalent.");
                }
+             }
+           }
 
-               if (sidebar) {
-                   context.ui().sidebar.show(sidebar);
-               } else {
-                   context.ui().sidebar.select(null);
-               }
+           var geom = {
+             type: "Polygon",
+             coordinates: coordinates
            };
+           return feature(geom, properties, options);
+         }
 
+         exports.polygon = polygon;
+         /**
+          * Creates a {@link Polygon} {@link FeatureCollection} from an Array of Polygon coordinates.
+          *
+          * @name polygons
+          * @param {Array<Array<Array<Array<number>>>>} coordinates an array of Polygon coordinates
+          * @param {Object} [properties={}] an Object of key-value pairs to add as properties
+          * @param {Object} [options={}] Optional Parameters
+          * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
+          * @param {string|number} [options.id] Identifier associated with the FeatureCollection
+          * @returns {FeatureCollection<Polygon>} Polygon FeatureCollection
+          * @example
+          * var polygons = turf.polygons([
+          *   [[[-5, 52], [-4, 56], [-2, 51], [-7, 54], [-5, 52]]],
+          *   [[[-15, 42], [-14, 46], [-12, 41], [-17, 44], [-15, 42]]],
+          * ]);
+          *
+          * //=polygons
+          */
 
-           mode.exit = function() {
-               context.ui().sidebar.hover.cancel();
-               _behaviors.forEach(context.uninstall);
+         function polygons(coordinates, properties, options) {
+           if (options === void 0) {
+             options = {};
+           }
 
-               if (sidebar) {
-                   context.ui().sidebar.hide();
-               }
-           };
+           return featureCollection(coordinates.map(function (coords) {
+             return polygon(coords, properties);
+           }), options);
+         }
 
+         exports.polygons = polygons;
+         /**
+          * Creates a {@link LineString} {@link Feature} from an Array of Positions.
+          *
+          * @name lineString
+          * @param {Array<Array<number>>} coordinates an array of Positions
+          * @param {Object} [properties={}] an Object of key-value pairs to add as properties
+          * @param {Object} [options={}] Optional Parameters
+          * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
+          * @param {string|number} [options.id] Identifier associated with the Feature
+          * @returns {Feature<LineString>} LineString Feature
+          * @example
+          * var linestring1 = turf.lineString([[-24, 63], [-23, 60], [-25, 65], [-20, 69]], {name: 'line 1'});
+          * var linestring2 = turf.lineString([[-14, 43], [-13, 40], [-15, 45], [-10, 49]], {name: 'line 2'});
+          *
+          * //=linestring1
+          * //=linestring2
+          */
 
-           mode.sidebar = function(_) {
-               if (!arguments.length) return sidebar;
-               sidebar = _;
-               return mode;
-           };
+         function lineString(coordinates, properties, options) {
+           if (options === void 0) {
+             options = {};
+           }
 
+           if (coordinates.length < 2) {
+             throw new Error("coordinates must be an array of two or more positions");
+           }
 
-           mode.operations = function() {
-               return [operationPaste(context)];
+           var geom = {
+             type: "LineString",
+             coordinates: coordinates
            };
+           return feature(geom, properties, options);
+         }
 
+         exports.lineString = lineString;
+         /**
+          * Creates a {@link LineString} {@link FeatureCollection} from an Array of LineString coordinates.
+          *
+          * @name lineStrings
+          * @param {Array<Array<Array<number>>>} coordinates an array of LinearRings
+          * @param {Object} [properties={}] an Object of key-value pairs to add as properties
+          * @param {Object} [options={}] Optional Parameters
+          * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north]
+          * associated with the FeatureCollection
+          * @param {string|number} [options.id] Identifier associated with the FeatureCollection
+          * @returns {FeatureCollection<LineString>} LineString FeatureCollection
+          * @example
+          * var linestrings = turf.lineStrings([
+          *   [[-24, 63], [-23, 60], [-25, 65], [-20, 69]],
+          *   [[-14, 43], [-13, 40], [-15, 45], [-10, 49]]
+          * ]);
+          *
+          * //=linestrings
+          */
 
-           return mode;
-       }
-
-       function behaviorAddWay(context) {
-           var dispatch$1 = dispatch('start', 'startFromWay', 'startFromNode');
-           var draw = behaviorDraw(context);
-
-           function behavior(surface) {
-               draw.on('click', function() { dispatch$1.apply('start', this, arguments); })
-                   .on('clickWay', function() { dispatch$1.apply('startFromWay', this, arguments); })
-                   .on('clickNode', function() { dispatch$1.apply('startFromNode', this, arguments); })
-                   .on('cancel', behavior.cancel)
-                   .on('finish', behavior.cancel);
-
-               context.map()
-                   .dblclickZoomEnable(false);
-
-               surface.call(draw);
+         function lineStrings(coordinates, properties, options) {
+           if (options === void 0) {
+             options = {};
            }
 
+           return featureCollection(coordinates.map(function (coords) {
+             return lineString(coords, properties);
+           }), options);
+         }
 
-           behavior.off = function(surface) {
-               surface.call(draw.off);
-           };
-
+         exports.lineStrings = lineStrings;
+         /**
+          * Takes one or more {@link Feature|Features} and creates a {@link FeatureCollection}.
+          *
+          * @name featureCollection
+          * @param {Feature[]} features input features
+          * @param {Object} [options={}] Optional Parameters
+          * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
+          * @param {string|number} [options.id] Identifier associated with the Feature
+          * @returns {FeatureCollection} FeatureCollection of Features
+          * @example
+          * var locationA = turf.point([-75.343, 39.984], {name: 'Location A'});
+          * var locationB = turf.point([-75.833, 39.284], {name: 'Location B'});
+          * var locationC = turf.point([-75.534, 39.123], {name: 'Location C'});
+          *
+          * var collection = turf.featureCollection([
+          *   locationA,
+          *   locationB,
+          *   locationC
+          * ]);
+          *
+          * //=collection
+          */
 
-           behavior.cancel = function() {
-               window.setTimeout(function() {
-                   context.map().dblclickZoomEnable(true);
-               }, 1000);
+         function featureCollection(features, options) {
+           if (options === void 0) {
+             options = {};
+           }
 
-               context.enter(modeBrowse(context));
+           var fc = {
+             type: "FeatureCollection"
            };
 
-
-           return utilRebind(behavior, dispatch$1, 'on');
-       }
-
-       function behaviorHash(context) {
-
-           // cached window.location.hash
-           var _cachedHash = null;
-           // allowable latitude range
-           var _latitudeLimit = 90 - 1e-8;
-
-           function computedHashParameters() {
-               var map = context.map();
-               var center = map.center();
-               var zoom = map.zoom();
-               var precision = Math.max(0, Math.ceil(Math.log(zoom) / Math.LN2));
-               var oldParams = utilObjectOmit(utilStringQs(window.location.hash),
-                   ['comment', 'source', 'hashtags', 'walkthrough']
-               );
-               var newParams = {};
-
-               delete oldParams.id;
-               var selected = context.selectedIDs().filter(function(id) {
-                   return context.hasEntity(id);
-               });
-               if (selected.length) {
-                   newParams.id = selected.join(',');
-               }
-
-               newParams.map = zoom.toFixed(2) +
-                   '/' + center[1].toFixed(precision) +
-                   '/' + center[0].toFixed(precision);
-
-               return Object.assign(oldParams, newParams);
+           if (options.id) {
+             fc.id = options.id;
            }
 
-           function computedHash() {
-               return '#' + utilQsString(computedHashParameters(), true);
+           if (options.bbox) {
+             fc.bbox = options.bbox;
            }
 
-           function computedTitle(includeChangeCount) {
+           fc.features = features;
+           return fc;
+         }
 
-               var baseTitle = context.documentTitleBase() || 'iD';
-               var contextual;
-               var changeCount;
-               var titleID;
+         exports.featureCollection = featureCollection;
+         /**
+          * Creates a {@link Feature<MultiLineString>} based on a
+          * coordinate array. Properties can be added optionally.
+          *
+          * @name multiLineString
+          * @param {Array<Array<Array<number>>>} coordinates an array of LineStrings
+          * @param {Object} [properties={}] an Object of key-value pairs to add as properties
+          * @param {Object} [options={}] Optional Parameters
+          * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
+          * @param {string|number} [options.id] Identifier associated with the Feature
+          * @returns {Feature<MultiLineString>} a MultiLineString feature
+          * @throws {Error} if no coordinates are passed
+          * @example
+          * var multiLine = turf.multiLineString([[[0,0],[10,10]]]);
+          *
+          * //=multiLine
+          */
 
-               var selected = context.selectedIDs().filter(function(id) {
-                   return context.hasEntity(id);
-               });
-               if (selected.length) {
-                   var firstLabel = utilDisplayLabel(context.entity(selected[0]), context.graph());
-                   if (selected.length > 1 ) {
-                       contextual = _t('title.labeled_and_more', {
-                           labeled: firstLabel,
-                           count: (selected.length - 1).toString()
-                       });
-                   } else {
-                       contextual = firstLabel;
-                   }
-                   titleID = 'context';
-               }
+         function multiLineString(coordinates, properties, options) {
+           if (options === void 0) {
+             options = {};
+           }
 
-               if (includeChangeCount) {
-                   changeCount = context.history().difference().summary().length;
-                   if (changeCount > 0) {
-                       titleID = contextual ? 'changes_context' : 'changes';
-                   }
-               }
+           var geom = {
+             type: "MultiLineString",
+             coordinates: coordinates
+           };
+           return feature(geom, properties, options);
+         }
 
-               if (titleID) {
-                   return _t('title.format.' + titleID, {
-                       changes: changeCount,
-                       base: baseTitle,
-                       context: contextual
-                   });
-               }
+         exports.multiLineString = multiLineString;
+         /**
+          * Creates a {@link Feature<MultiPoint>} based on a
+          * coordinate array. Properties can be added optionally.
+          *
+          * @name multiPoint
+          * @param {Array<Array<number>>} coordinates an array of Positions
+          * @param {Object} [properties={}] an Object of key-value pairs to add as properties
+          * @param {Object} [options={}] Optional Parameters
+          * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
+          * @param {string|number} [options.id] Identifier associated with the Feature
+          * @returns {Feature<MultiPoint>} a MultiPoint feature
+          * @throws {Error} if no coordinates are passed
+          * @example
+          * var multiPt = turf.multiPoint([[0,0],[10,10]]);
+          *
+          * //=multiPt
+          */
 
-               return baseTitle;
+         function multiPoint(coordinates, properties, options) {
+           if (options === void 0) {
+             options = {};
            }
 
-           function updateTitle(includeChangeCount) {
-               if (!context.setsDocumentTitle()) return;
+           var geom = {
+             type: "MultiPoint",
+             coordinates: coordinates
+           };
+           return feature(geom, properties, options);
+         }
 
-               var newTitle = computedTitle(includeChangeCount);
-               if (document.title !== newTitle) {
-                   document.title = newTitle;
-               }
-           }
+         exports.multiPoint = multiPoint;
+         /**
+          * Creates a {@link Feature<MultiPolygon>} based on a
+          * coordinate array. Properties can be added optionally.
+          *
+          * @name multiPolygon
+          * @param {Array<Array<Array<Array<number>>>>} coordinates an array of Polygons
+          * @param {Object} [properties={}] an Object of key-value pairs to add as properties
+          * @param {Object} [options={}] Optional Parameters
+          * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
+          * @param {string|number} [options.id] Identifier associated with the Feature
+          * @returns {Feature<MultiPolygon>} a multipolygon feature
+          * @throws {Error} if no coordinates are passed
+          * @example
+          * var multiPoly = turf.multiPolygon([[[[0,0],[0,10],[10,10],[10,0],[0,0]]]]);
+          *
+          * //=multiPoly
+          *
+          */
 
-           function updateHashIfNeeded() {
-               if (context.inIntro()) return;
+         function multiPolygon(coordinates, properties, options) {
+           if (options === void 0) {
+             options = {};
+           }
 
-               var latestHash = computedHash();
-               if (_cachedHash !== latestHash) {
-                   _cachedHash = latestHash;
+           var geom = {
+             type: "MultiPolygon",
+             coordinates: coordinates
+           };
+           return feature(geom, properties, options);
+         }
 
-                   // Update the URL hash without affecting the browser navigation stack,
-                   // though unavoidably creating a browser history entry
-                   window.history.replaceState(null, computedTitle(false /* includeChangeCount */), latestHash);
+         exports.multiPolygon = multiPolygon;
+         /**
+          * Creates a {@link Feature<GeometryCollection>} based on a
+          * coordinate array. Properties can be added optionally.
+          *
+          * @name geometryCollection
+          * @param {Array<Geometry>} geometries an array of GeoJSON Geometries
+          * @param {Object} [properties={}] an Object of key-value pairs to add as properties
+          * @param {Object} [options={}] Optional Parameters
+          * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
+          * @param {string|number} [options.id] Identifier associated with the Feature
+          * @returns {Feature<GeometryCollection>} a GeoJSON GeometryCollection Feature
+          * @example
+          * var pt = turf.geometry("Point", [100, 0]);
+          * var line = turf.geometry("LineString", [[101, 0], [102, 1]]);
+          * var collection = turf.geometryCollection([pt, line]);
+          *
+          * // => collection
+          */
 
-                   // set the title we want displayed for the browser tab/window
-                   updateTitle(true /* includeChangeCount */);
-               }
+         function geometryCollection(geometries, properties, options) {
+           if (options === void 0) {
+             options = {};
            }
 
-           var _throttledUpdate = throttle(updateHashIfNeeded, 500);
-           var _throttledUpdateTitle = throttle(function() {
-               updateTitle(true /* includeChangeCount */);
-           }, 500);
+           var geom = {
+             type: "GeometryCollection",
+             geometries: geometries
+           };
+           return feature(geom, properties, options);
+         }
 
-           function hashchange() {
+         exports.geometryCollection = geometryCollection;
+         /**
+          * Round number to precision
+          *
+          * @param {number} num Number
+          * @param {number} [precision=0] Precision
+          * @returns {number} rounded number
+          * @example
+          * turf.round(120.4321)
+          * //=120
+          *
+          * turf.round(120.4321, 2)
+          * //=120.43
+          */
 
-               // ignore spurious hashchange events
-               if (window.location.hash === _cachedHash) return;
+         function round(num, precision) {
+           if (precision === void 0) {
+             precision = 0;
+           }
 
-               _cachedHash = window.location.hash;
+           if (precision && !(precision >= 0)) {
+             throw new Error("precision must be a positive number");
+           }
 
-               var q = utilStringQs(_cachedHash);
-               var mapArgs = (q.map || '').split('/').map(Number);
+           var multiplier = Math.pow(10, precision || 0);
+           return Math.round(num * multiplier) / multiplier;
+         }
 
-               if (mapArgs.length < 3 || mapArgs.some(isNaN)) {
-                   // replace bogus hash
-                   updateHashIfNeeded();
+         exports.round = round;
+         /**
+          * Convert a distance measurement (assuming a spherical Earth) from radians to a more friendly unit.
+          * Valid units: miles, nauticalmiles, inches, yards, meters, metres, kilometers, centimeters, feet
+          *
+          * @name radiansToLength
+          * @param {number} radians in radians across the sphere
+          * @param {string} [units="kilometers"] can be degrees, radians, miles, or kilometers inches, yards, metres,
+          * meters, kilometres, kilometers.
+          * @returns {number} distance
+          */
 
-               } else {
-                   // don't update if the new hash already reflects the state of iD
-                   if (_cachedHash === computedHash()) return;
+         function radiansToLength(radians, units) {
+           if (units === void 0) {
+             units = "kilometers";
+           }
 
-                   var mode = context.mode();
+           var factor = exports.factors[units];
 
-                   context.map().centerZoom([mapArgs[2], Math.min(_latitudeLimit, Math.max(-_latitudeLimit, mapArgs[1]))], mapArgs[0]);
+           if (!factor) {
+             throw new Error(units + " units is invalid");
+           }
 
-                   if (q.id) {
-                       var ids = q.id.split(',').filter(function(id) {
-                           return context.hasEntity(id);
-                       });
-                       var skip = mode && mode.id === 'select' && utilArrayIdentical(mode.selectedIDs(), ids);
-                       if (ids.length && !skip) {
-                           context.enter(modeSelect(context, ids));
-                           return;
-                       }
-                   }
+           return radians * factor;
+         }
 
-                   var center = context.map().center();
-                   var dist = geoSphericalDistance(center, [mapArgs[2], mapArgs[1]]);
-                   var maxdist = 500;
+         exports.radiansToLength = radiansToLength;
+         /**
+          * Convert a distance measurement (assuming a spherical Earth) from a real-world unit into radians
+          * Valid units: miles, nauticalmiles, inches, yards, meters, metres, kilometers, centimeters, feet
+          *
+          * @name lengthToRadians
+          * @param {number} distance in real units
+          * @param {string} [units="kilometers"] can be degrees, radians, miles, or kilometers inches, yards, metres,
+          * meters, kilometres, kilometers.
+          * @returns {number} radians
+          */
 
-                   // Don't allow the hash location to change too much while drawing
-                   // This can happen if the user accidently hit the back button.  #3996
-                   if (mode && mode.id.match(/^draw/) !== null && dist > maxdist) {
-                       context.enter(modeBrowse(context));
-                       return;
-                   }
-               }
+         function lengthToRadians(distance, units) {
+           if (units === void 0) {
+             units = "kilometers";
            }
 
-           function behavior() {
-               context.map()
-                   .on('move.behaviorHash', _throttledUpdate);
+           var factor = exports.factors[units];
 
-               context.history()
-                   .on('change.behaviorHash', _throttledUpdateTitle);
+           if (!factor) {
+             throw new Error(units + " units is invalid");
+           }
 
-               context
-                   .on('enter.behaviorHash', _throttledUpdate);
+           return distance / factor;
+         }
 
-               select(window)
-                   .on('hashchange.behaviorHash', hashchange);
+         exports.lengthToRadians = lengthToRadians;
+         /**
+          * Convert a distance measurement (assuming a spherical Earth) from a real-world unit into degrees
+          * Valid units: miles, nauticalmiles, inches, yards, meters, metres, centimeters, kilometres, feet
+          *
+          * @name lengthToDegrees
+          * @param {number} distance in real units
+          * @param {string} [units="kilometers"] can be degrees, radians, miles, or kilometers inches, yards, metres,
+          * meters, kilometres, kilometers.
+          * @returns {number} degrees
+          */
 
-               if (window.location.hash) {
-                   var q = utilStringQs(window.location.hash);
+         function lengthToDegrees(distance, units) {
+           return radiansToDegrees(lengthToRadians(distance, units));
+         }
 
-                   if (q.id) {
-                       //if (!context.history().hasRestorableChanges()) {
-                           // targeting specific features: download, select, and zoom to them
-                           context.zoomToEntity(q.id.split(',')[0], !q.map);
-                       //}
-                   }
+         exports.lengthToDegrees = lengthToDegrees;
+         /**
+          * Converts any bearing angle from the north line direction (positive clockwise)
+          * and returns an angle between 0-360 degrees (positive clockwise), 0 being the north line
+          *
+          * @name bearingToAzimuth
+          * @param {number} bearing angle, between -180 and +180 degrees
+          * @returns {number} angle between 0 and 360 degrees
+          */
 
-                   if (q.walkthrough === 'true') {
-                       behavior.startWalkthrough = true;
-                   }
+         function bearingToAzimuth(bearing) {
+           var angle = bearing % 360;
 
-                   if (q.map) {
-                       behavior.hadHash = true;
-                   }
+           if (angle < 0) {
+             angle += 360;
+           }
 
-                   hashchange();
+           return angle;
+         }
 
-                   updateTitle(false);
-               }
-           }
+         exports.bearingToAzimuth = bearingToAzimuth;
+         /**
+          * Converts an angle in radians to degrees
+          *
+          * @name radiansToDegrees
+          * @param {number} radians angle in radians
+          * @returns {number} degrees between 0 and 360 degrees
+          */
 
-           behavior.off = function() {
-               _throttledUpdate.cancel();
-               _throttledUpdateTitle.cancel();
+         function radiansToDegrees(radians) {
+           var degrees = radians % (2 * Math.PI);
+           return degrees * 180 / Math.PI;
+         }
 
-               context.map()
-                   .on('move.behaviorHash', null);
+         exports.radiansToDegrees = radiansToDegrees;
+         /**
+          * Converts an angle in degrees to radians
+          *
+          * @name degreesToRadians
+          * @param {number} degrees angle between 0 and 360 degrees
+          * @returns {number} angle in radians
+          */
 
-               context
-                   .on('enter.behaviorHash', null);
+         function degreesToRadians(degrees) {
+           var radians = degrees % 360;
+           return radians * Math.PI / 180;
+         }
 
-               select(window)
-                   .on('hashchange.behaviorHash', null);
+         exports.degreesToRadians = degreesToRadians;
+         /**
+          * Converts a length to the requested unit.
+          * Valid units: miles, nauticalmiles, inches, yards, meters, metres, kilometers, centimeters, feet
+          *
+          * @param {number} length to be converted
+          * @param {Units} [originalUnit="kilometers"] of the length
+          * @param {Units} [finalUnit="kilometers"] returned unit
+          * @returns {number} the converted length
+          */
 
-               window.location.hash = '';
-           };
+         function convertLength(length, originalUnit, finalUnit) {
+           if (originalUnit === void 0) {
+             originalUnit = "kilometers";
+           }
 
-           return behavior;
-       }
+           if (finalUnit === void 0) {
+             finalUnit = "kilometers";
+           }
 
-       /*
-           iD.coreDifference represents the difference between two graphs.
-           It knows how to calculate the set of entities that were
-           created, modified, or deleted, and also contains the logic
-           for recursively extending a difference to the complete set
-           of entities that will require a redraw, taking into account
-           child and parent relationships.
-        */
-       function coreDifference(base, head) {
-           var _changes = {};
-           var _didChange = {};  // 'addition', 'deletion', 'geometry', 'properties'
-           var _diff = {};
+           if (!(length >= 0)) {
+             throw new Error("length must be a positive number");
+           }
 
-           function checkEntityID(id) {
-               var h = head.entities[id];
-               var b = base.entities[id];
+           return radiansToLength(lengthToRadians(length, originalUnit), finalUnit);
+         }
 
-               if (h === b) return;
-               if (_changes[id]) return;
+         exports.convertLength = convertLength;
+         /**
+          * Converts a area to the requested unit.
+          * Valid units: kilometers, kilometres, meters, metres, centimetres, millimeters, acres, miles, yards, feet, inches
+          * @param {number} area to be converted
+          * @param {Units} [originalUnit="meters"] of the distance
+          * @param {Units} [finalUnit="kilometers"] returned unit
+          * @returns {number} the converted distance
+          */
 
-               if (!h && b) {
-                   _changes[id] = { base: b, head: h };
-                   _didChange.deletion = true;
-                   return;
-               }
-               if (h && !b) {
-                   _changes[id] = { base: b, head: h };
-                   _didChange.addition = true;
-                   return;
-               }
+         function convertArea(area, originalUnit, finalUnit) {
+           if (originalUnit === void 0) {
+             originalUnit = "meters";
+           }
 
-               if (h && b) {
-                   if (h.members && b.members && !fastDeepEqual(h.members, b.members)) {
-                       _changes[id] = { base: b, head: h };
-                       _didChange.geometry = true;
-                       _didChange.properties = true;
-                       return;
-                   }
-                   if (h.loc && b.loc && !geoVecEqual(h.loc, b.loc)) {
-                       _changes[id] = { base: b, head: h };
-                       _didChange.geometry = true;
-                   }
-                   if (h.nodes && b.nodes && !fastDeepEqual(h.nodes, b.nodes)) {
-                       _changes[id] = { base: b, head: h };
-                       _didChange.geometry = true;
-                   }
-                   if (h.tags && b.tags && !fastDeepEqual(h.tags, b.tags)) {
-                       _changes[id] = { base: b, head: h };
-                       _didChange.properties = true;
-                   }
-               }
+           if (finalUnit === void 0) {
+             finalUnit = "kilometers";
            }
 
-           function load() {
-               // HOT CODE: there can be many thousands of downloaded entities, so looping
-               // through them all can become a performance bottleneck. Optimize by
-               // resolving duplicates and using a basic `for` loop
-               var ids = utilArrayUniq(Object.keys(head.entities).concat(Object.keys(base.entities)));
-               for (var i = 0; i < ids.length; i++) {
-                   checkEntityID(ids[i]);
-               }
+           if (!(area >= 0)) {
+             throw new Error("area must be a positive number");
            }
-           load();
 
+           var startFactor = exports.areaFactors[originalUnit];
 
-           _diff.length = function length() {
-               return Object.keys(_changes).length;
-           };
+           if (!startFactor) {
+             throw new Error("invalid original units");
+           }
 
+           var finalFactor = exports.areaFactors[finalUnit];
 
-           _diff.changes = function changes() {
-               return _changes;
-           };
+           if (!finalFactor) {
+             throw new Error("invalid final units");
+           }
 
-           _diff.didChange = _didChange;
+           return area / startFactor * finalFactor;
+         }
 
+         exports.convertArea = convertArea;
+         /**
+          * isNumber
+          *
+          * @param {*} num Number to validate
+          * @returns {boolean} true/false
+          * @example
+          * turf.isNumber(123)
+          * //=true
+          * turf.isNumber('foo')
+          * //=false
+          */
 
-           // pass true to include affected relation members
-           _diff.extantIDs = function extantIDs(includeRelMembers) {
-               var result = new Set();
-               Object.keys(_changes).forEach(function(id) {
-                   if (_changes[id].head) {
-                       result.add(id);
-                   }
+         function isNumber(num) {
+           return !isNaN(num) && num !== null && !Array.isArray(num) && !/^\s*$/.test(num);
+         }
 
-                   var h = _changes[id].head;
-                   var b = _changes[id].base;
-                   var entity = h || b;
+         exports.isNumber = isNumber;
+         /**
+          * isObject
+          *
+          * @param {*} input variable to validate
+          * @returns {boolean} true/false
+          * @example
+          * turf.isObject({elevation: 10})
+          * //=true
+          * turf.isObject('foo')
+          * //=false
+          */
 
-                   if (includeRelMembers && entity.type === 'relation') {
-                       var mh = h ? h.members.map(function(m) { return m.id; }) : [];
-                       var mb = b ? b.members.map(function(m) { return m.id; }) : [];
-                       utilArrayUnion(mh, mb).forEach(function(memberID) {
-                           if (head.hasEntity(memberID)) {
-                               result.add(memberID);
-                           }
-                       });
-                   }
-               });
+         function isObject(input) {
+           return !!input && input.constructor === Object;
+         }
 
-               return Array.from(result);
-           };
+         exports.isObject = isObject;
+         /**
+          * Validate BBox
+          *
+          * @private
+          * @param {Array<number>} bbox BBox to validate
+          * @returns {void}
+          * @throws Error if BBox is not valid
+          * @example
+          * validateBBox([-180, -40, 110, 50])
+          * //=OK
+          * validateBBox([-180, -40])
+          * //=Error
+          * validateBBox('Foo')
+          * //=Error
+          * validateBBox(5)
+          * //=Error
+          * validateBBox(null)
+          * //=Error
+          * validateBBox(undefined)
+          * //=Error
+          */
 
+         function validateBBox(bbox) {
+           if (!bbox) {
+             throw new Error("bbox is required");
+           }
 
-           _diff.modified = function modified() {
-               var result = [];
-               Object.values(_changes).forEach(function(change) {
-                   if (change.base && change.head) {
-                       result.push(change.head);
-                   }
-               });
-               return result;
-           };
+           if (!Array.isArray(bbox)) {
+             throw new Error("bbox must be an Array");
+           }
 
+           if (bbox.length !== 4 && bbox.length !== 6) {
+             throw new Error("bbox must be an Array of 4 or 6 numbers");
+           }
 
-           _diff.created = function created() {
-               var result = [];
-               Object.values(_changes).forEach(function(change) {
-                   if (!change.base && change.head) {
-                       result.push(change.head);
-                   }
-               });
-               return result;
-           };
+           bbox.forEach(function (num) {
+             if (!isNumber(num)) {
+               throw new Error("bbox must only contain numbers");
+             }
+           });
+         }
 
+         exports.validateBBox = validateBBox;
+         /**
+          * Validate Id
+          *
+          * @private
+          * @param {string|number} id Id to validate
+          * @returns {void}
+          * @throws Error if Id is not valid
+          * @example
+          * validateId([-180, -40, 110, 50])
+          * //=Error
+          * validateId([-180, -40])
+          * //=Error
+          * validateId('Foo')
+          * //=OK
+          * validateId(5)
+          * //=OK
+          * validateId(null)
+          * //=Error
+          * validateId(undefined)
+          * //=Error
+          */
 
-           _diff.deleted = function deleted() {
-               var result = [];
-               Object.values(_changes).forEach(function(change) {
-                   if (change.base && !change.head) {
-                       result.push(change.base);
-                   }
-               });
-               return result;
-           };
+         function validateId(id) {
+           if (!id) {
+             throw new Error("id is required");
+           }
 
+           if (["string", "number"].indexOf(_typeof(id)) === -1) {
+             throw new Error("id must be a number or a string");
+           }
+         }
 
-           _diff.summary = function summary() {
-               var relevant = {};
+         exports.validateId = validateId; // Deprecated methods
 
-               var keys = Object.keys(_changes);
-               for (var i = 0; i < keys.length; i++) {
-                   var change = _changes[keys[i]];
+         function radians2degrees() {
+           throw new Error("method has been renamed to `radiansToDegrees`");
+         }
 
-                   if (change.head && change.head.geometry(head) !== 'vertex') {
-                       addEntity(change.head, head, change.base ? 'modified' : 'created');
+         exports.radians2degrees = radians2degrees;
 
-                   } else if (change.base && change.base.geometry(base) !== 'vertex') {
-                       addEntity(change.base, base, 'deleted');
+         function degrees2radians() {
+           throw new Error("method has been renamed to `degreesToRadians`");
+         }
 
-                   } else if (change.base && change.head) { // modified vertex
-                       var moved    = !fastDeepEqual(change.base.loc,  change.head.loc);
-                       var retagged = !fastDeepEqual(change.base.tags, change.head.tags);
+         exports.degrees2radians = degrees2radians;
 
-                       if (moved) {
-                           addParents(change.head);
-                       }
+         function distanceToDegrees() {
+           throw new Error("method has been renamed to `lengthToDegrees`");
+         }
 
-                       if (retagged || (moved && change.head.hasInterestingTags())) {
-                           addEntity(change.head, head, 'modified');
-                       }
+         exports.distanceToDegrees = distanceToDegrees;
 
-                   } else if (change.head && change.head.hasInterestingTags()) { // created vertex
-                       addEntity(change.head, head, 'created');
+         function distanceToRadians() {
+           throw new Error("method has been renamed to `lengthToRadians`");
+         }
 
-                   } else if (change.base && change.base.hasInterestingTags()) { // deleted vertex
-                       addEntity(change.base, base, 'deleted');
-                   }
-               }
+         exports.distanceToRadians = distanceToRadians;
 
-               return Object.values(relevant);
+         function radiansToDistance() {
+           throw new Error("method has been renamed to `radiansToLength`");
+         }
 
+         exports.radiansToDistance = radiansToDistance;
 
-               function addEntity(entity, graph, changeType) {
-                   relevant[entity.id] = {
-                       entity: entity,
-                       graph: graph,
-                       changeType: changeType
-                   };
-               }
+         function bearingToAngle() {
+           throw new Error("method has been renamed to `bearingToAzimuth`");
+         }
 
-               function addParents(entity) {
-                   var parents = head.parentWays(entity);
-                   for (var j = parents.length - 1; j >= 0; j--) {
-                       var parent = parents[j];
-                       if (!(parent.id in relevant)) {
-                           addEntity(parent, head, 'modified');
-                       }
-                   }
-               }
-           };
+         exports.bearingToAngle = bearingToAngle;
 
+         function convertDistance() {
+           throw new Error("method has been renamed to `convertLength`");
+         }
 
-           // returns complete set of entities that require a redraw
-           //  (optionally within given `extent`)
-           _diff.complete = function complete(extent) {
-               var result = {};
-               var id, change;
+         exports.convertDistance = convertDistance;
+       });
 
-               for (id in _changes) {
-                   change = _changes[id];
+       var invariant = createCommonjsModule(function (module, exports) {
 
-                   var h = change.head;
-                   var b = change.base;
-                   var entity = h || b;
-                   var i;
+         Object.defineProperty(exports, "__esModule", {
+           value: true
+         });
+         /**
+          * Unwrap a coordinate from a Point Feature, Geometry or a single coordinate.
+          *
+          * @name getCoord
+          * @param {Array<number>|Geometry<Point>|Feature<Point>} coord GeoJSON Point or an Array of numbers
+          * @returns {Array<number>} coordinates
+          * @example
+          * var pt = turf.point([10, 10]);
+          *
+          * var coord = turf.getCoord(pt);
+          * //= [10, 10]
+          */
 
-                   if (extent &&
-                       (!h || !h.intersects(extent, head)) &&
-                       (!b || !b.intersects(extent, base)))
-                       continue;
+         function getCoord(coord) {
+           if (!coord) {
+             throw new Error("coord is required");
+           }
 
-                   result[id] = h;
+           if (!Array.isArray(coord)) {
+             if (coord.type === "Feature" && coord.geometry !== null && coord.geometry.type === "Point") {
+               return coord.geometry.coordinates;
+             }
 
-                   if (entity.type === 'way') {
-                       var nh = h ? h.nodes : [];
-                       var nb = b ? b.nodes : [];
-                       var diff;
+             if (coord.type === "Point") {
+               return coord.coordinates;
+             }
+           }
 
-                       diff = utilArrayDifference(nh, nb);
-                       for (i = 0; i < diff.length; i++) {
-                           result[diff[i]] = head.hasEntity(diff[i]);
-                       }
+           if (Array.isArray(coord) && coord.length >= 2 && !Array.isArray(coord[0]) && !Array.isArray(coord[1])) {
+             return coord;
+           }
 
-                       diff = utilArrayDifference(nb, nh);
-                       for (i = 0; i < diff.length; i++) {
-                           result[diff[i]] = head.hasEntity(diff[i]);
-                       }
-                   }
+           throw new Error("coord must be GeoJSON Point or an Array of numbers");
+         }
 
-                   if (entity.type === 'relation' && entity.isMultipolygon()) {
-                       var mh = h ? h.members.map(function(m) { return m.id; }) : [];
-                       var mb = b ? b.members.map(function(m) { return m.id; }) : [];
-                       var ids = utilArrayUnion(mh, mb);
-                       for (i = 0; i < ids.length; i++) {
-                           var member = head.hasEntity(ids[i]);
-                           if (!member) continue;   // not downloaded
-                           if (extent && !member.intersects(extent, head)) continue;   // not visible
-                           result[ids[i]] = member;
-                       }
-                   }
+         exports.getCoord = getCoord;
+         /**
+          * Unwrap coordinates from a Feature, Geometry Object or an Array
+          *
+          * @name getCoords
+          * @param {Array<any>|Geometry|Feature} coords Feature, Geometry Object or an Array
+          * @returns {Array<any>} coordinates
+          * @example
+          * var poly = turf.polygon([[[119.32, -8.7], [119.55, -8.69], [119.51, -8.54], [119.32, -8.7]]]);
+          *
+          * var coords = turf.getCoords(poly);
+          * //= [[[119.32, -8.7], [119.55, -8.69], [119.51, -8.54], [119.32, -8.7]]]
+          */
 
-                   addParents(head.parentWays(entity), result);
-                   addParents(head.parentRelations(entity), result);
-               }
+         function getCoords(coords) {
+           if (Array.isArray(coords)) {
+             return coords;
+           } // Feature
 
-               return result;
 
+           if (coords.type === "Feature") {
+             if (coords.geometry !== null) {
+               return coords.geometry.coordinates;
+             }
+           } else {
+             // Geometry
+             if (coords.coordinates) {
+               return coords.coordinates;
+             }
+           }
+
+           throw new Error("coords must be GeoJSON Feature, Geometry Object or an Array");
+         }
 
-               function addParents(parents, result) {
-                   for (var i = 0; i < parents.length; i++) {
-                       var parent = parents[i];
-                       if (parent.id in result) continue;
+         exports.getCoords = getCoords;
+         /**
+          * Checks if coordinates contains a number
+          *
+          * @name containsNumber
+          * @param {Array<any>} coordinates GeoJSON Coordinates
+          * @returns {boolean} true if Array contains a number
+          */
 
-                       result[parent.id] = parent;
-                       addParents(head.parentRelations(parent), result);
-                   }
-               }
-           };
+         function containsNumber(coordinates) {
+           if (coordinates.length > 1 && helpers$1.isNumber(coordinates[0]) && helpers$1.isNumber(coordinates[1])) {
+             return true;
+           }
 
+           if (Array.isArray(coordinates[0]) && coordinates[0].length) {
+             return containsNumber(coordinates[0]);
+           }
 
-           return _diff;
-       }
+           throw new Error("coordinates must only contain numbers");
+         }
 
-       function coreTree(head) {
-           // tree for entities
-           var _rtree = new RBush();
-           var _bboxes = {};
+         exports.containsNumber = containsNumber;
+         /**
+          * Enforce expectations about types of GeoJSON objects for Turf.
+          *
+          * @name geojsonType
+          * @param {GeoJSON} value any GeoJSON object
+          * @param {string} type expected GeoJSON type
+          * @param {string} name name of calling function
+          * @throws {Error} if value is not the expected type.
+          */
 
-           // maintain a separate tree for granular way segments
-           var _segmentsRTree = new RBush();
-           var _segmentsBBoxes = {};
-           var _segmentsByWayId = {};
+         function geojsonType(value, type, name) {
+           if (!type || !name) {
+             throw new Error("type and name required");
+           }
 
-           var tree = {};
+           if (!value || value.type !== type) {
+             throw new Error("Invalid input to " + name + ": must be a " + type + ", given " + value.type);
+           }
+         }
 
+         exports.geojsonType = geojsonType;
+         /**
+          * Enforce expectations about types of {@link Feature} inputs for Turf.
+          * Internally this uses {@link geojsonType} to judge geometry types.
+          *
+          * @name featureOf
+          * @param {Feature} feature a feature with an expected geometry type
+          * @param {string} type expected GeoJSON type
+          * @param {string} name name of calling function
+          * @throws {Error} error if value is not the expected type.
+          */
 
-           function entityBBox(entity) {
-               var bbox = entity.extent(head).bbox();
-               bbox.id = entity.id;
-               _bboxes[entity.id] = bbox;
-               return bbox;
+         function featureOf(feature, type, name) {
+           if (!feature) {
+             throw new Error("No feature passed");
            }
 
+           if (!name) {
+             throw new Error(".featureOf() requires a name");
+           }
 
-           function segmentBBox(segment) {
-               var extent = segment.extent(head);
-               // extent can be null if the node entites aren't in the graph for some reason
-               if (!extent) return null;
+           if (!feature || feature.type !== "Feature" || !feature.geometry) {
+             throw new Error("Invalid input to " + name + ", Feature with geometry required");
+           }
 
-               var bbox = extent.bbox();
-               bbox.segment = segment;
-               _segmentsBBoxes[segment.id] = bbox;
-               return bbox;
+           if (!feature.geometry || feature.geometry.type !== type) {
+             throw new Error("Invalid input to " + name + ": must be a " + type + ", given " + feature.geometry.type);
            }
+         }
+
+         exports.featureOf = featureOf;
+         /**
+          * Enforce expectations about types of {@link FeatureCollection} inputs for Turf.
+          * Internally this uses {@link geojsonType} to judge geometry types.
+          *
+          * @name collectionOf
+          * @param {FeatureCollection} featureCollection a FeatureCollection for which features will be judged
+          * @param {string} type expected GeoJSON type
+          * @param {string} name name of calling function
+          * @throws {Error} if value is not the expected type.
+          */
 
+         function collectionOf(featureCollection, type, name) {
+           if (!featureCollection) {
+             throw new Error("No featureCollection passed");
+           }
 
-           function removeEntity(entity) {
-               _rtree.remove(_bboxes[entity.id]);
-               delete _bboxes[entity.id];
+           if (!name) {
+             throw new Error(".collectionOf() requires a name");
+           }
 
-               if (_segmentsByWayId[entity.id]) {
-                   _segmentsByWayId[entity.id].forEach(function(segment) {
-                       _segmentsRTree.remove(_segmentsBBoxes[segment.id]);
-                       delete _segmentsBBoxes[segment.id];
-                   });
-                   delete _segmentsByWayId[entity.id];
-               }
+           if (!featureCollection || featureCollection.type !== "FeatureCollection") {
+             throw new Error("Invalid input to " + name + ", FeatureCollection required");
            }
 
+           for (var _i = 0, _a = featureCollection.features; _i < _a.length; _i++) {
+             var feature = _a[_i];
+
+             if (!feature || feature.type !== "Feature" || !feature.geometry) {
+               throw new Error("Invalid input to " + name + ", Feature with geometry required");
+             }
 
-           function loadEntities(entities) {
-               _rtree.load(entities.map(entityBBox));
+             if (!feature.geometry || feature.geometry.type !== type) {
+               throw new Error("Invalid input to " + name + ": must be a " + type + ", given " + feature.geometry.type);
+             }
+           }
+         }
 
-               var segments = [];
-               entities.forEach(function(entity) {
-                   if (entity.segments) {
-                       var entitySegments = entity.segments(head);
-                       // cache these to make them easy to remove later
-                       _segmentsByWayId[entity.id] = entitySegments;
-                       segments = segments.concat(entitySegments);
-                   }
-               });
-               if (segments.length) _segmentsRTree.load(segments.map(segmentBBox).filter(Boolean));
+         exports.collectionOf = collectionOf;
+         /**
+          * Get Geometry from Feature or Geometry Object
+          *
+          * @param {Feature|Geometry} geojson GeoJSON Feature or Geometry Object
+          * @returns {Geometry|null} GeoJSON Geometry Object
+          * @throws {Error} if geojson is not a Feature or Geometry Object
+          * @example
+          * var point = {
+          *   "type": "Feature",
+          *   "properties": {},
+          *   "geometry": {
+          *     "type": "Point",
+          *     "coordinates": [110, 40]
+          *   }
+          * }
+          * var geom = turf.getGeom(point)
+          * //={"type": "Point", "coordinates": [110, 40]}
+          */
+
+         function getGeom(geojson) {
+           if (geojson.type === "Feature") {
+             return geojson.geometry;
            }
 
+           return geojson;
+         }
 
-           function updateParents(entity, insertions, memo) {
-               head.parentWays(entity).forEach(function(way) {
-                   if (_bboxes[way.id]) {
-                       removeEntity(way);
-                       insertions[way.id] = way;
-                   }
-                   updateParents(way, insertions, memo);
-               });
+         exports.getGeom = getGeom;
+         /**
+          * Get GeoJSON object's type, Geometry type is prioritize.
+          *
+          * @param {GeoJSON} geojson GeoJSON object
+          * @param {string} [name="geojson"] name of the variable to display in error message
+          * @returns {string} GeoJSON type
+          * @example
+          * var point = {
+          *   "type": "Feature",
+          *   "properties": {},
+          *   "geometry": {
+          *     "type": "Point",
+          *     "coordinates": [110, 40]
+          *   }
+          * }
+          * var geom = turf.getType(point)
+          * //="Point"
+          */
 
-               head.parentRelations(entity).forEach(function(relation) {
-                   if (memo[entity.id]) return;
-                   memo[entity.id] = true;
-                   if (_bboxes[relation.id]) {
-                       removeEntity(relation);
-                       insertions[relation.id] = relation;
-                   }
-                   updateParents(relation, insertions, memo);
-               });
+         function getType(geojson, name) {
+           if (geojson.type === "FeatureCollection") {
+             return "FeatureCollection";
            }
 
+           if (geojson.type === "GeometryCollection") {
+             return "GeometryCollection";
+           }
 
-           tree.rebase = function(entities, force) {
-               var insertions = {};
+           if (geojson.type === "Feature" && geojson.geometry !== null) {
+             return geojson.geometry.type;
+           }
 
-               for (var i = 0; i < entities.length; i++) {
-                   var entity = entities[i];
-                   if (!entity.visible) continue;
+           return geojson.type;
+         }
 
-                   if (head.entities.hasOwnProperty(entity.id) || _bboxes[entity.id]) {
-                       if (!force) {
-                           continue;
-                       } else if (_bboxes[entity.id]) {
-                           removeEntity(entity);
-                       }
-                   }
+         exports.getType = getType;
+       });
 
-                   insertions[entity.id] = entity;
-                   updateParents(entity, insertions, {});
-               }
+       var lineclip_1 = lineclip;
+       var _default = lineclip;
+       lineclip.polyline = lineclip;
+       lineclip.polygon = polygonclip; // Cohen-Sutherland line clippign algorithm, adapted to efficiently
+       // handle polylines rather than just segments
 
-               loadEntities(Object.values(insertions));
+       function lineclip(points, bbox, result) {
+         var len = points.length,
+             codeA = bitCode(points[0], bbox),
+             part = [],
+             i,
+             a,
+             b,
+             codeB,
+             lastCode;
+         if (!result) result = [];
 
-               return tree;
-           };
+         for (i = 1; i < len; i++) {
+           a = points[i - 1];
+           b = points[i];
+           codeB = lastCode = bitCode(b, bbox);
 
+           while (true) {
+             if (!(codeA | codeB)) {
+               // accept
+               part.push(a);
+
+               if (codeB !== lastCode) {
+                 // segment went outside
+                 part.push(b);
+
+                 if (i < len - 1) {
+                   // start a new line
+                   result.push(part);
+                   part = [];
+                 }
+               } else if (i === len - 1) {
+                 part.push(b);
+               }
 
-           function updateToGraph(graph) {
-               if (graph === head) return;
+               break;
+             } else if (codeA & codeB) {
+               // trivial reject
+               break;
+             } else if (codeA) {
+               // a outside, intersect with clip edge
+               a = intersect(a, b, codeA, bbox);
+               codeA = bitCode(a, bbox);
+             } else {
+               // b outside
+               b = intersect(a, b, codeB, bbox);
+               codeB = bitCode(b, bbox);
+             }
+           }
 
-               var diff = coreDifference(head, graph);
+           codeA = lastCode;
+         }
 
-               head = graph;
+         if (part.length) result.push(part);
+         return result;
+       } // Sutherland-Hodgeman polygon clipping algorithm
 
-               var changed = diff.didChange;
-               if (!changed.addition && !changed.deletion && !changed.geometry) return;
 
-               var insertions = {};
+       function polygonclip(points, bbox) {
+         var result, edge, prev, prevInside, i, p, inside; // clip against each side of the clip rectangle
 
-               if (changed.deletion) {
-                   diff.deleted().forEach(function(entity) {
-                       removeEntity(entity);
-                   });
-               }
+         for (edge = 1; edge <= 8; edge *= 2) {
+           result = [];
+           prev = points[points.length - 1];
+           prevInside = !(bitCode(prev, bbox) & edge);
 
-               if (changed.geometry) {
-                   diff.modified().forEach(function(entity) {
-                       removeEntity(entity);
-                       insertions[entity.id] = entity;
-                       updateParents(entity, insertions, {});
-                   });
-               }
+           for (i = 0; i < points.length; i++) {
+             p = points[i];
+             inside = !(bitCode(p, bbox) & edge); // if segment goes through the clip window, add an intersection
 
-               if (changed.addition) {
-                   diff.created().forEach(function(entity) {
-                       insertions[entity.id] = entity;
-                   });
-               }
+             if (inside !== prevInside) result.push(intersect(prev, p, edge, bbox));
+             if (inside) result.push(p); // add a point if it's inside
 
-               loadEntities(Object.values(insertions));
+             prev = p;
+             prevInside = inside;
            }
 
-           // returns an array of entities with bounding boxes overlapping `extent` for the given `graph`
-           tree.intersects = function(extent, graph) {
-               updateToGraph(graph);
-               return _rtree.search(extent.bbox())
-                   .map(function(bbox) { return graph.entity(bbox.id); });
-           };
+           points = result;
+           if (!points.length) break;
+         }
 
-           // returns an array of segment objects with bounding boxes overlapping `extent` for the given `graph`
-           tree.waySegments = function(extent, graph) {
-               updateToGraph(graph);
-               return _segmentsRTree.search(extent.bbox())
-                   .map(function(bbox) { return bbox.segment; });
-           };
+         return result;
+       } // intersect a segment against one of the 4 lines that make up the bbox
 
 
-           return tree;
-       }
+       function intersect(a, b, edge, bbox) {
+         return edge & 8 ? [a[0] + (b[0] - a[0]) * (bbox[3] - a[1]) / (b[1] - a[1]), bbox[3]] : // top
+         edge & 4 ? [a[0] + (b[0] - a[0]) * (bbox[1] - a[1]) / (b[1] - a[1]), bbox[1]] : // bottom
+         edge & 2 ? [bbox[2], a[1] + (b[1] - a[1]) * (bbox[2] - a[0]) / (b[0] - a[0])] : // right
+         edge & 1 ? [bbox[0], a[1] + (b[1] - a[1]) * (bbox[0] - a[0]) / (b[0] - a[0])] : // left
+         null;
+       } // bit code reflects the point position relative to the bbox:
+       //         left  mid  right
+       //    top  1001  1000  1010
+       //    mid  0001  0000  0010
+       // bottom  0101  0100  0110
 
-       function uiModal(selection, blocking) {
-         let keybinding = utilKeybinding('modal');
-         let previous = selection.select('div.modal');
-         let animate = previous.empty();
 
-         previous.transition()
-           .duration(200)
-           .style('opacity', 0)
-           .remove();
+       function bitCode(p, bbox) {
+         var code = 0;
+         if (p[0] < bbox[0]) code |= 1; // left
+         else if (p[0] > bbox[2]) code |= 2; // right
 
-         let shaded = selection
-           .append('div')
-           .attr('class', 'shaded')
-           .style('opacity', 0);
+         if (p[1] < bbox[1]) code |= 4; // bottom
+         else if (p[1] > bbox[3]) code |= 8; // top
 
-         shaded.close = () => {
-           shaded
-             .transition()
-             .duration(200)
-             .style('opacity',0)
-             .remove();
+         return code;
+       }
+       lineclip_1["default"] = _default;
 
-           modal
-             .transition()
-             .duration(200)
-             .style('top','0px');
+       var bboxClip_1 = createCommonjsModule(function (module, exports) {
 
-           select(document)
-             .call(keybinding.unbind);
+         var __importStar = commonjsGlobal && commonjsGlobal.__importStar || function (mod) {
+           if (mod && mod.__esModule) return mod;
+           var result = {};
+           if (mod != null) for (var k in mod) {
+             if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+           }
+           result["default"] = mod;
+           return result;
          };
 
+         Object.defineProperty(exports, "__esModule", {
+           value: true
+         });
 
-         let modal = shaded
-           .append('div')
-           .attr('class', 'modal fillL');
+         var lineclip = __importStar(lineclip_1);
+         /**
+          * Takes a {@link Feature} and a bbox and clips the feature to the bbox using
+          * [lineclip](https://github.com/mapbox/lineclip).
+          * May result in degenerate edges when clipping Polygons.
+          *
+          * @name bboxClip
+          * @param {Feature<LineString|MultiLineString|Polygon|MultiPolygon>} feature feature to clip to the bbox
+          * @param {BBox} bbox extent in [minX, minY, maxX, maxY] order
+          * @returns {Feature<LineString|MultiLineString|Polygon|MultiPolygon>} clipped Feature
+          * @example
+          * var bbox = [0, 0, 10, 10];
+          * var poly = turf.polygon([[[2, 2], [8, 4], [12, 8], [3, 7], [2, 2]]]);
+          *
+          * var clipped = turf.bboxClip(poly, bbox);
+          *
+          * //addToMap
+          * var addToMap = [bbox, poly, clipped]
+          */
 
-         if (!blocking) {
-           shaded.on('click.remove-modal', () => {
-             if (event.target === this) {
-               shaded.close();
-             }
-           });
 
-           modal
-             .append('button')
-             .attr('class', 'close')
-             .on('click', shaded.close)
-             .call(svgIcon('#iD-icon-close'));
+         function bboxClip(feature, bbox) {
+           var geom = invariant.getGeom(feature);
+           var type = geom.type;
+           var properties = feature.type === "Feature" ? feature.properties : {};
+           var coords = geom.coordinates;
 
-           keybinding
-             .on('⌫', shaded.close)
-             .on('⎋', shaded.close);
+           switch (type) {
+             case "LineString":
+             case "MultiLineString":
+               var lines_1 = [];
 
-           select(document)
-             .call(keybinding);
-         }
+               if (type === "LineString") {
+                 coords = [coords];
+               }
 
-         modal
-           .append('div')
-           .attr('class', 'content');
+               coords.forEach(function (line) {
+                 lineclip.polyline(line, bbox, lines_1);
+               });
 
-         if (animate) {
-           shaded.transition().style('opacity', 1);
-         } else {
-           shaded.style('opacity', 1);
-         }
+               if (lines_1.length === 1) {
+                 return helpers$1.lineString(lines_1[0], properties);
+               }
 
-         return shaded;
-       }
+               return helpers$1.multiLineString(lines_1, properties);
 
-       function uiLoading(context) {
-         let _modalSelection = select(null);
-         let _message = '';
-         let _blocking = false;
+             case "Polygon":
+               return helpers$1.polygon(clipPolygon(coords, bbox), properties);
 
+             case "MultiPolygon":
+               return helpers$1.multiPolygon(coords.map(function (poly) {
+                 return clipPolygon(poly, bbox);
+               }), properties);
 
-         let loading = (selection) => {
-           _modalSelection = uiModal(selection, _blocking);
+             default:
+               throw new Error("geometry " + type + " not supported");
+           }
+         }
 
-           let loadertext = _modalSelection.select('.content')
-             .classed('loading-modal', true)
-             .append('div')
-             .attr('class', 'modal-section fillL');
+         exports["default"] = bboxClip;
 
-           loadertext
-             .append('img')
-             .attr('class', 'loader')
-             .attr('src', context.imagePath('loader-white.gif'));
+         function clipPolygon(rings, bbox) {
+           var outRings = [];
 
-           loadertext
-             .append('h3')
-             .text(_message);
+           for (var _i = 0, rings_1 = rings; _i < rings_1.length; _i++) {
+             var ring = rings_1[_i];
+             var clipped = lineclip.polygon(ring, bbox);
 
-           _modalSelection.select('button.close')
-             .attr('class', 'hide');
+             if (clipped.length > 0) {
+               if (clipped[0][0] !== clipped[clipped.length - 1][0] || clipped[0][1] !== clipped[clipped.length - 1][1]) {
+                 clipped.push(clipped[0]);
+               }
 
-           return loading;
-         };
+               if (clipped.length >= 4) {
+                 outRings.push(clipped);
+               }
+             }
+           }
 
+           return outRings;
+         }
+       });
+       var turf_bboxClip = /*@__PURE__*/getDefaultExportFromCjs(bboxClip_1);
 
-         loading.message = function(val) {
-           if (!arguments.length) return _message;
-           _message = val;
-           return loading;
+       var fastJsonStableStringify = function fastJsonStableStringify(data, opts) {
+         if (!opts) opts = {};
+         if (typeof opts === 'function') opts = {
+           cmp: opts
          };
+         var cycles = typeof opts.cycles === 'boolean' ? opts.cycles : false;
 
+         var cmp = opts.cmp && function (f) {
+           return function (node) {
+             return function (a, b) {
+               var aobj = {
+                 key: a,
+                 value: node[a]
+               };
+               var bobj = {
+                 key: b,
+                 value: node[b]
+               };
+               return f(aobj, bobj);
+             };
+           };
+         }(opts.cmp);
 
-         loading.blocking = function(val) {
-           if (!arguments.length) return _blocking;
-           _blocking = val;
-           return loading;
-         };
+         var seen = [];
+         return function stringify(node) {
+           if (node && node.toJSON && typeof node.toJSON === 'function') {
+             node = node.toJSON();
+           }
 
+           if (node === undefined) return;
+           if (typeof node == 'number') return isFinite(node) ? '' + node : 'null';
+           if (_typeof(node) !== 'object') return JSON.stringify(node);
+           var i, out;
 
-         loading.close = () => {
-           _modalSelection.remove();
-         };
+           if (Array.isArray(node)) {
+             out = '[';
 
+             for (i = 0; i < node.length; i++) {
+               if (i) out += ',';
+               out += stringify(node[i]) || 'null';
+             }
 
-         loading.isShown = () => {
-           return _modalSelection && !_modalSelection.empty() && _modalSelection.node().parentNode;
-         };
+             return out + ']';
+           }
 
+           if (node === null) return 'null';
 
-         return loading;
-       }
+           if (seen.indexOf(node) !== -1) {
+             if (cycles) return JSON.stringify('__cycle__');
+             throw new TypeError('Converting circular structure to JSON');
+           }
 
-       function coreHistory(context) {
-           var dispatch$1 = dispatch('change', 'merge', 'restore', 'undone', 'redone');
-           var lock = utilSessionMutex('lock');
+           var seenIndex = seen.push(node) - 1;
+           var keys = Object.keys(node).sort(cmp && cmp(node));
+           out = '';
 
-           // restorable if iD not open in another window/tab and a saved history exists in localStorage
-           var _hasUnresolvedRestorableChanges = lock.lock() && !!corePreferences(getKey('saved_history'));
+           for (i = 0; i < keys.length; i++) {
+             var key = keys[i];
+             var value = stringify(node[key]);
+             if (!value) continue;
+             if (out) out += ',';
+             out += JSON.stringify(key) + ':' + value;
+           }
 
-           var duration = 150;
-           var _imageryUsed = [];
-           var _photoOverlaysUsed = [];
-           var _checkpoints = {};
-           var _pausedGraph;
-           var _stack;
-           var _index;
-           var _tree;
+           seen.splice(seenIndex, 1);
+           return '{' + out + '}';
+         }(data);
+       };
 
+       function DEFAULT_COMPARE(a, b) {
+         return a > b ? 1 : a < b ? -1 : 0;
+       }
 
-           // internal _act, accepts list of actions and eased time
-           function _act(actions, t) {
-               actions = Array.prototype.slice.call(actions);
+       var SplayTree = /*#__PURE__*/function () {
+         function SplayTree() {
+           var compare = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : DEFAULT_COMPARE;
+           var noDuplicates = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : false;
 
-               var annotation;
-               if (typeof actions[actions.length - 1] !== 'function') {
-                   annotation = actions.pop();
-               }
+           _classCallCheck(this, SplayTree);
 
-               var graph = _stack[_index].graph;
-               for (var i = 0; i < actions.length; i++) {
-                   graph = actions[i](graph, t);
-               }
+           this._compare = compare;
+           this._root = null;
+           this._size = 0;
+           this._noDuplicates = !!noDuplicates;
+         }
 
-               return {
-                   graph: graph,
-                   annotation: annotation,
-                   imageryUsed: _imageryUsed,
-                   photoOverlaysUsed: _photoOverlaysUsed,
-                   transform: context.projection.transform(),
-                   selectedIDs: context.selectedIDs()
-               };
-           }
+         _createClass(SplayTree, [{
+           key: "rotateLeft",
+           value: function rotateLeft(x) {
+             var y = x.right;
 
+             if (y) {
+               x.right = y.left;
+               if (y.left) y.left.parent = x;
+               y.parent = x.parent;
+             }
 
-           // internal _perform with eased time
-           function _perform(args, t) {
-               var previous = _stack[_index].graph;
-               _stack = _stack.slice(0, _index + 1);
-               var actionResult = _act(args, t);
-               _stack.push(actionResult);
-               _index++;
-               return change(previous);
+             if (!x.parent) this._root = y;else if (x === x.parent.left) x.parent.left = y;else x.parent.right = y;
+             if (y) y.left = x;
+             x.parent = y;
            }
+         }, {
+           key: "rotateRight",
+           value: function rotateRight(x) {
+             var y = x.left;
 
+             if (y) {
+               x.left = y.right;
+               if (y.right) y.right.parent = x;
+               y.parent = x.parent;
+             }
 
-           // internal _replace with eased time
-           function _replace(args, t) {
-               var previous = _stack[_index].graph;
-               // assert(_index == _stack.length - 1)
-               var actionResult = _act(args, t);
-               _stack[_index] = actionResult;
-               return change(previous);
+             if (!x.parent) this._root = y;else if (x === x.parent.left) x.parent.left = y;else x.parent.right = y;
+             if (y) y.right = x;
+             x.parent = y;
            }
-
-
-           // internal _overwrite with eased time
-           function _overwrite(args, t) {
-               var previous = _stack[_index].graph;
-               if (_index > 0) {
-                   _index--;
-                   _stack.pop();
+         }, {
+           key: "_splay",
+           value: function _splay(x) {
+             while (x.parent) {
+               var p = x.parent;
+
+               if (!p.parent) {
+                 if (p.left === x) this.rotateRight(p);else this.rotateLeft(p);
+               } else if (p.left === x && p.parent.left === p) {
+                 this.rotateRight(p.parent);
+                 this.rotateRight(p);
+               } else if (p.right === x && p.parent.right === p) {
+                 this.rotateLeft(p.parent);
+                 this.rotateLeft(p);
+               } else if (p.left === x && p.parent.right === p) {
+                 this.rotateRight(p);
+                 this.rotateLeft(p);
+               } else {
+                 this.rotateLeft(p);
+                 this.rotateRight(p);
                }
-               _stack = _stack.slice(0, _index + 1);
-               var actionResult = _act(args, t);
-               _stack.push(actionResult);
-               _index++;
-               return change(previous);
+             }
            }
+         }, {
+           key: "splay",
+           value: function splay(x) {
+             var p, gp, ggp, l, r;
+
+             while (x.parent) {
+               p = x.parent;
+               gp = p.parent;
+
+               if (gp && gp.parent) {
+                 ggp = gp.parent;
+                 if (ggp.left === gp) ggp.left = x;else ggp.right = x;
+                 x.parent = ggp;
+               } else {
+                 x.parent = null;
+                 this._root = x;
+               }
 
+               l = x.left;
+               r = x.right;
 
-           // determine difference and dispatch a change event
-           function change(previous) {
-               var difference = coreDifference(previous, history.graph());
-               if (!_pausedGraph) {
-                   dispatch$1.call('change', this, difference);
-               }
-               return difference;
-           }
+               if (x === p.left) {
+                 // left
+                 if (gp) {
+                   if (gp.left === p) {
+                     /* zig-zig */
+                     if (p.right) {
+                       gp.left = p.right;
+                       gp.left.parent = gp;
+                     } else gp.left = null;
 
+                     p.right = gp;
+                     gp.parent = p;
+                   } else {
+                     /* zig-zag */
+                     if (l) {
+                       gp.right = l;
+                       l.parent = gp;
+                     } else gp.right = null;
 
-           // iD uses namespaced keys so multiple installations do not conflict
-           function getKey(n) {
-               return 'iD_' + window.location.origin + '_' + n;
-           }
+                     x.left = gp;
+                     gp.parent = x;
+                   }
+                 }
 
+                 if (r) {
+                   p.left = r;
+                   r.parent = p;
+                 } else p.left = null;
 
-           var history = {
+                 x.right = p;
+                 p.parent = x;
+               } else {
+                 // right
+                 if (gp) {
+                   if (gp.right === p) {
+                     /* zig-zig */
+                     if (p.left) {
+                       gp.right = p.left;
+                       gp.right.parent = gp;
+                     } else gp.right = null;
+
+                     p.left = gp;
+                     gp.parent = p;
+                   } else {
+                     /* zig-zag */
+                     if (r) {
+                       gp.left = r;
+                       r.parent = gp;
+                     } else gp.left = null;
 
-               graph: function() {
-                   return _stack[_index].graph;
-               },
+                     x.right = gp;
+                     gp.parent = x;
+                   }
+                 }
 
+                 if (l) {
+                   p.right = l;
+                   l.parent = p;
+                 } else p.right = null;
 
-               tree: function() {
-                   return _tree;
-               },
+                 x.left = p;
+                 p.parent = x;
+               }
+             }
+           }
+         }, {
+           key: "replace",
+           value: function replace(u, v) {
+             if (!u.parent) this._root = v;else if (u === u.parent.left) u.parent.left = v;else u.parent.right = v;
+             if (v) v.parent = u.parent;
+           }
+         }, {
+           key: "minNode",
+           value: function minNode() {
+             var u = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this._root;
+             if (u) while (u.left) {
+               u = u.left;
+             }
+             return u;
+           }
+         }, {
+           key: "maxNode",
+           value: function maxNode() {
+             var u = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this._root;
+             if (u) while (u.right) {
+               u = u.right;
+             }
+             return u;
+           }
+         }, {
+           key: "insert",
+           value: function insert(key, data) {
+             var z = this._root;
+             var p = null;
+             var comp = this._compare;
+             var cmp;
+
+             if (this._noDuplicates) {
+               while (z) {
+                 p = z;
+                 cmp = comp(z.key, key);
+                 if (cmp === 0) return;else if (comp(z.key, key) < 0) z = z.right;else z = z.left;
+               }
+             } else {
+               while (z) {
+                 p = z;
+                 if (comp(z.key, key) < 0) z = z.right;else z = z.left;
+               }
+             }
 
+             z = {
+               key: key,
+               data: data,
+               left: null,
+               right: null,
+               parent: p
+             };
+             if (!p) this._root = z;else if (comp(p.key, z.key) < 0) p.right = z;else p.left = z;
+             this.splay(z);
+             this._size++;
+             return z;
+           }
+         }, {
+           key: "find",
+           value: function find(key) {
+             var z = this._root;
+             var comp = this._compare;
 
-               base: function() {
-                   return _stack[0].graph;
-               },
+             while (z) {
+               var cmp = comp(z.key, key);
+               if (cmp < 0) z = z.right;else if (cmp > 0) z = z.left;else return z;
+             }
 
+             return null;
+           }
+           /**
+            * Whether the tree contains a node with the given key
+            * @param  {Key} key
+            * @return {boolean} true/false
+            */
 
-               merge: function(entities/*, extent*/) {
-                   var stack = _stack.map(function(state) { return state.graph; });
-                   _stack[0].graph.rebase(entities, stack, false);
-                   _tree.rebase(entities, false);
+         }, {
+           key: "contains",
+           value: function contains(key) {
+             var node = this._root;
+             var comparator = this._compare;
 
-                   dispatch$1.call('merge', this, entities);
-               },
+             while (node) {
+               var cmp = comparator(key, node.key);
+               if (cmp === 0) return true;else if (cmp < 0) node = node.left;else node = node.right;
+             }
 
+             return false;
+           }
+         }, {
+           key: "remove",
+           value: function remove(key) {
+             var z = this.find(key);
+             if (!z) return false;
+             this.splay(z);
+             if (!z.left) this.replace(z, z.right);else if (!z.right) this.replace(z, z.left);else {
+               var y = this.minNode(z.right);
 
-               perform: function() {
-                   // complete any transition already in progress
-                   select(document).interrupt('history.perform');
+               if (y.parent !== z) {
+                 this.replace(y, y.right);
+                 y.right = z.right;
+                 y.right.parent = y;
+               }
 
-                   var transitionable = false;
-                   var action0 = arguments[0];
+               this.replace(z, y);
+               y.left = z.left;
+               y.left.parent = y;
+             }
+             this._size--;
+             return true;
+           }
+         }, {
+           key: "removeNode",
+           value: function removeNode(z) {
+             if (!z) return false;
+             this.splay(z);
+             if (!z.left) this.replace(z, z.right);else if (!z.right) this.replace(z, z.left);else {
+               var y = this.minNode(z.right);
 
-                   if (arguments.length === 1 ||
-                       (arguments.length === 2 && (typeof arguments[1] !== 'function'))) {
-                       transitionable = !!action0.transitionable;
-                   }
+               if (y.parent !== z) {
+                 this.replace(y, y.right);
+                 y.right = z.right;
+                 y.right.parent = y;
+               }
 
-                   if (transitionable) {
-                       var origArguments = arguments;
-                       select(document)
-                           .transition('history.perform')
-                           .duration(duration)
-                           .ease(linear$1)
-                           .tween('history.tween', function() {
-                               return function(t) {
-                                   if (t < 1) _overwrite([action0], t);
-                               };
-                           })
-                           .on('start', function() {
-                               _perform([action0], 0);
-                           })
-                           .on('end interrupt', function() {
-                               _overwrite(origArguments, 1);
-                           });
+               this.replace(z, y);
+               y.left = z.left;
+               y.left.parent = y;
+             }
+             this._size--;
+             return true;
+           }
+         }, {
+           key: "erase",
+           value: function erase(key) {
+             var z = this.find(key);
+             if (!z) return;
+             this.splay(z);
+             var s = z.left;
+             var t = z.right;
+             var sMax = null;
 
-                   } else {
-                       return _perform(arguments);
-                   }
-               },
+             if (s) {
+               s.parent = null;
+               sMax = this.maxNode(s);
+               this.splay(sMax);
+               this._root = sMax;
+             }
 
+             if (t) {
+               if (s) sMax.right = t;else this._root = t;
+               t.parent = sMax;
+             }
 
-               replace: function() {
-                   select(document).interrupt('history.perform');
-                   return _replace(arguments, 1);
-               },
+             this._size--;
+           }
+           /**
+            * Removes and returns the node with smallest key
+            * @return {?Node}
+            */
 
+         }, {
+           key: "pop",
+           value: function pop() {
+             var node = this._root,
+                 returnValue = null;
 
-               // Same as calling pop and then perform
-               overwrite: function() {
-                   select(document).interrupt('history.perform');
-                   return _overwrite(arguments, 1);
-               },
+             if (node) {
+               while (node.left) {
+                 node = node.left;
+               }
 
+               returnValue = {
+                 key: node.key,
+                 data: node.data
+               };
+               this.remove(node.key);
+             }
 
-               pop: function(n) {
-                   select(document).interrupt('history.perform');
+             return returnValue;
+           }
+           /* eslint-disable class-methods-use-this */
 
-                   var previous = _stack[_index].graph;
-                   if (isNaN(+n) || +n < 0) {
-                       n = 1;
-                   }
-                   while (n-- > 0 && _index > 0) {
-                       _index--;
-                       _stack.pop();
-                   }
-                   return change(previous);
-               },
+           /**
+            * Successor node
+            * @param  {Node} node
+            * @return {?Node}
+            */
 
+         }, {
+           key: "next",
+           value: function next(node) {
+             var successor = node;
 
-               // Back to the previous annotated state or _index = 0.
-               undo: function() {
-                   select(document).interrupt('history.perform');
+             if (successor) {
+               if (successor.right) {
+                 successor = successor.right;
 
-                   var previousStack = _stack[_index];
-                   var previous = previousStack.graph;
-                   while (_index > 0) {
-                       _index--;
-                       if (_stack[_index].annotation) break;
-                   }
+                 while (successor && successor.left) {
+                   successor = successor.left;
+                 }
+               } else {
+                 successor = node.parent;
 
-                   dispatch$1.call('undone', this, _stack[_index], previousStack);
-                   return change(previous);
-               },
+                 while (successor && successor.right === node) {
+                   node = successor;
+                   successor = successor.parent;
+                 }
+               }
+             }
 
+             return successor;
+           }
+           /**
+            * Predecessor node
+            * @param  {Node} node
+            * @return {?Node}
+            */
 
-               // Forward to the next annotated state.
-               redo: function() {
-                   select(document).interrupt('history.perform');
+         }, {
+           key: "prev",
+           value: function prev(node) {
+             var predecessor = node;
 
-                   var previousStack = _stack[_index];
-                   var previous = previousStack.graph;
-                   var tryIndex = _index;
-                   while (tryIndex < _stack.length - 1) {
-                       tryIndex++;
-                       if (_stack[tryIndex].annotation) {
-                           _index = tryIndex;
-                           dispatch$1.call('redone', this, _stack[_index], previousStack);
-                           break;
-                       }
-                   }
+             if (predecessor) {
+               if (predecessor.left) {
+                 predecessor = predecessor.left;
 
-                   return change(previous);
-               },
+                 while (predecessor && predecessor.right) {
+                   predecessor = predecessor.right;
+                 }
+               } else {
+                 predecessor = node.parent;
 
+                 while (predecessor && predecessor.left === node) {
+                   node = predecessor;
+                   predecessor = predecessor.parent;
+                 }
+               }
+             }
 
-               pauseChangeDispatch: function() {
-                   if (!_pausedGraph) {
-                       _pausedGraph = _stack[_index].graph;
-                   }
-               },
+             return predecessor;
+           }
+           /* eslint-enable class-methods-use-this */
 
+           /**
+            * @param  {forEachCallback} callback
+            * @return {SplayTree}
+            */
 
-               resumeChangeDispatch: function() {
-                   if (_pausedGraph) {
-                       var previous = _pausedGraph;
-                       _pausedGraph = null;
-                       return change(previous);
-                   }
-               },
+         }, {
+           key: "forEach",
+           value: function forEach(callback) {
+             var current = this._root;
+             var s = [],
+                 done = false,
+                 i = 0;
+
+             while (!done) {
+               // Reach the left most Node of the current Node
+               if (current) {
+                 // Place pointer to a tree node on the stack
+                 // before traversing the node's left subtree
+                 s.push(current);
+                 current = current.left;
+               } else {
+                 // BackTrack from the empty subtree and visit the Node
+                 // at the top of the stack; however, if the stack is
+                 // empty you are done
+                 if (s.length > 0) {
+                   current = s.pop();
+                   callback(current, i++); // We have visited the node and its left
+                   // subtree. Now, it's right subtree's turn
 
+                   current = current.right;
+                 } else done = true;
+               }
+             }
 
-               undoAnnotation: function() {
-                   var i = _index;
-                   while (i >= 0) {
-                       if (_stack[i].annotation) return _stack[i].annotation;
-                       i--;
-                   }
-               },
+             return this;
+           }
+           /**
+            * Walk key range from `low` to `high`. Stops if `fn` returns a value.
+            * @param  {Key}      low
+            * @param  {Key}      high
+            * @param  {Function} fn
+            * @param  {*?}       ctx
+            * @return {SplayTree}
+            */
 
+         }, {
+           key: "range",
+           value: function range(low, high, fn, ctx) {
+             var Q = [];
+             var compare = this._compare;
+             var node = this._root,
+                 cmp;
+
+             while (Q.length !== 0 || node) {
+               if (node) {
+                 Q.push(node);
+                 node = node.left;
+               } else {
+                 node = Q.pop();
+                 cmp = compare(node.key, high);
 
-               redoAnnotation: function() {
-                   var i = _index + 1;
-                   while (i <= _stack.length - 1) {
-                       if (_stack[i].annotation) return _stack[i].annotation;
-                       i++;
-                   }
-               },
+                 if (cmp > 0) {
+                   break;
+                 } else if (compare(node.key, low) >= 0) {
+                   if (fn.call(ctx, node)) return this; // stop if smth is returned
+                 }
+
+                 node = node.right;
+               }
+             }
 
+             return this;
+           }
+           /**
+            * Returns all keys in order
+            * @return {Array<Key>}
+            */
 
-               // Returns the entities from the active graph with bounding boxes
-               // overlapping the given `extent`.
-               intersects: function(extent) {
-                   return _tree.intersects(extent, _stack[_index].graph);
-               },
+         }, {
+           key: "keys",
+           value: function keys() {
+             var current = this._root;
+             var s = [],
+                 r = [],
+                 done = false;
+
+             while (!done) {
+               if (current) {
+                 s.push(current);
+                 current = current.left;
+               } else {
+                 if (s.length > 0) {
+                   current = s.pop();
+                   r.push(current.key);
+                   current = current.right;
+                 } else done = true;
+               }
+             }
 
+             return r;
+           }
+           /**
+            * Returns `data` fields of all nodes in order.
+            * @return {Array<Value>}
+            */
 
-               difference: function() {
-                   var base = _stack[0].graph;
-                   var head = _stack[_index].graph;
-                   return coreDifference(base, head);
-               },
+         }, {
+           key: "values",
+           value: function values() {
+             var current = this._root;
+             var s = [],
+                 r = [],
+                 done = false;
+
+             while (!done) {
+               if (current) {
+                 s.push(current);
+                 current = current.left;
+               } else {
+                 if (s.length > 0) {
+                   current = s.pop();
+                   r.push(current.data);
+                   current = current.right;
+                 } else done = true;
+               }
+             }
+
+             return r;
+           }
+           /**
+            * Returns node at given index
+            * @param  {number} index
+            * @return {?Node}
+            */
+
+         }, {
+           key: "at",
+           value: function at(index) {
+             // removed after a consideration, more misleading than useful
+             // index = index % this.size;
+             // if (index < 0) index = this.size - index;
+             var current = this._root;
+             var s = [],
+                 done = false,
+                 i = 0;
+
+             while (!done) {
+               if (current) {
+                 s.push(current);
+                 current = current.left;
+               } else {
+                 if (s.length > 0) {
+                   current = s.pop();
+                   if (i === index) return current;
+                   i++;
+                   current = current.right;
+                 } else done = true;
+               }
+             }
+
+             return null;
+           }
+           /**
+            * Bulk-load items. Both array have to be same size
+            * @param  {Array<Key>}    keys
+            * @param  {Array<Value>}  [values]
+            * @param  {Boolean}       [presort=false] Pre-sort keys and values, using
+            *                                         tree's comparator. Sorting is done
+            *                                         in-place
+            * @return {AVLTree}
+            */
 
+         }, {
+           key: "load",
+           value: function load() {
+             var keys = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : [];
+             var values = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
+             var presort = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
+             if (this._size !== 0) throw new Error('bulk-load: tree is not empty');
+             var size = keys.length;
+             if (presort) sort(keys, values, 0, size - 1, this._compare);
+             this._root = loadRecursive(null, keys, values, 0, size);
+             this._size = size;
+             return this;
+           }
+         }, {
+           key: "min",
+           value: function min() {
+             var node = this.minNode(this._root);
+             if (node) return node.key;else return null;
+           }
+         }, {
+           key: "max",
+           value: function max() {
+             var node = this.maxNode(this._root);
+             if (node) return node.key;else return null;
+           }
+         }, {
+           key: "isEmpty",
+           value: function isEmpty() {
+             return this._root === null;
+           }
+         }, {
+           key: "size",
+           get: function get() {
+             return this._size;
+           }
+           /**
+            * Create a tree and load it with items
+            * @param  {Array<Key>}          keys
+            * @param  {Array<Value>?}        [values]
+             * @param  {Function?}            [comparator]
+            * @param  {Boolean?}             [presort=false] Pre-sort keys and values, using
+            *                                               tree's comparator. Sorting is done
+            *                                               in-place
+            * @param  {Boolean?}             [noDuplicates=false]   Allow duplicates
+            * @return {SplayTree}
+            */
 
-               changes: function(action) {
-                   var base = _stack[0].graph;
-                   var head = _stack[_index].graph;
+         }], [{
+           key: "createTree",
+           value: function createTree(keys, values, comparator, presort, noDuplicates) {
+             return new SplayTree(comparator, noDuplicates).load(keys, values, presort);
+           }
+         }]);
 
-                   if (action) {
-                       head = action(head);
-                   }
+         return SplayTree;
+       }();
 
-                   var difference = coreDifference(base, head);
+       function loadRecursive(parent, keys, values, start, end) {
+         var size = end - start;
 
-                   return {
-                       modified: difference.modified(),
-                       created: difference.created(),
-                       deleted: difference.deleted()
-                   };
-               },
+         if (size > 0) {
+           var middle = start + Math.floor(size / 2);
+           var key = keys[middle];
+           var data = values[middle];
+           var node = {
+             key: key,
+             data: data,
+             parent: parent
+           };
+           node.left = loadRecursive(node, keys, values, start, middle);
+           node.right = loadRecursive(node, keys, values, middle + 1, end);
+           return node;
+         }
 
+         return null;
+       }
 
-               hasChanges: function() {
-                   return this.difference().length() > 0;
-               },
+       function sort(keys, values, left, right, compare) {
+         if (left >= right) return;
+         var pivot = keys[left + right >> 1];
+         var i = left - 1;
+         var j = right + 1;
 
+         while (true) {
+           do {
+             i++;
+           } while (compare(keys[i], pivot) < 0);
 
-               imageryUsed: function(sources) {
-                   if (sources) {
-                       _imageryUsed = sources;
-                       return history;
-                   } else {
-                       var s = new Set();
-                       _stack.slice(1, _index + 1).forEach(function(state) {
-                           state.imageryUsed.forEach(function(source) {
-                               if (source !== 'Custom') {
-                                   s.add(source);
-                               }
-                           });
-                       });
-                       return Array.from(s);
-                   }
-               },
+           do {
+             j--;
+           } while (compare(keys[j], pivot) > 0);
 
+           if (i >= j) break;
+           var tmp = keys[i];
+           keys[i] = keys[j];
+           keys[j] = tmp;
+           tmp = values[i];
+           values[i] = values[j];
+           values[j] = tmp;
+         }
 
-               photoOverlaysUsed: function(sources) {
-                   if (sources) {
-                       _photoOverlaysUsed = sources;
-                       return history;
-                   } else {
-                       var s = new Set();
-                       _stack.slice(1, _index + 1).forEach(function(state) {
-                           if (state.photoOverlaysUsed && Array.isArray(state.photoOverlaysUsed)) {
-                               state.photoOverlaysUsed.forEach(function(photoOverlay) {
-                                   s.add(photoOverlay);
-                               });
-                           }
-                       });
-                       return Array.from(s);
-                   }
-               },
+         sort(keys, values, left, j, compare);
+         sort(keys, values, j + 1, right, compare);
+       }
 
+       var NORMAL = 0;
+       var NON_CONTRIBUTING = 1;
+       var SAME_TRANSITION = 2;
+       var DIFFERENT_TRANSITION = 3;
 
-               // save the current history state
-               checkpoint: function(key) {
-                   _checkpoints[key] = {
-                       stack: _stack,
-                       index: _index
-                   };
-                   return history;
-               },
+       var INTERSECTION = 0;
+       var UNION = 1;
+       var DIFFERENCE = 2;
+       var XOR = 3;
 
+       /**
+        * @param  {SweepEvent} event
+        * @param  {SweepEvent} prev
+        * @param  {Operation} operation
+        */
 
-               // restore history state to a given checkpoint or reset completely
-               reset: function(key) {
-                   if (key !== undefined && _checkpoints.hasOwnProperty(key)) {
-                       _stack = _checkpoints[key].stack;
-                       _index = _checkpoints[key].index;
-                   } else {
-                       _stack = [{graph: coreGraph()}];
-                       _index = 0;
-                       _tree = coreTree(_stack[0].graph);
-                       _checkpoints = {};
-                   }
-                   dispatch$1.call('change');
-                   return history;
-               },
+       function computeFields(event, prev, operation) {
+         // compute inOut and otherInOut fields
+         if (prev === null) {
+           event.inOut = false;
+           event.otherInOut = true; // previous line segment in sweepline belongs to the same polygon
+         } else {
+           if (event.isSubject === prev.isSubject) {
+             event.inOut = !prev.inOut;
+             event.otherInOut = prev.otherInOut; // previous line segment in sweepline belongs to the clipping polygon
+           } else {
+             event.inOut = !prev.otherInOut;
+             event.otherInOut = prev.isVertical() ? !prev.inOut : prev.inOut;
+           } // compute prevInResult field
 
 
-               // `toIntroGraph()` is used to export the intro graph used by the walkthrough.
-               //
-               // To use it:
-               //  1. Start the walkthrough.
-               //  2. Get to a "free editing" tutorial step
-               //  3. Make your edits to the walkthrough map
-               //  4. In your browser dev console run:
-               //        `id.history().toIntroGraph()`
-               //  5. This outputs stringified JSON to the browser console
-               //  6. Copy it to `data/intro_graph.json` and prettify it in your code editor
-               toIntroGraph: function() {
-                   var nextID = { n: 0, r: 0, w: 0 };
-                   var permIDs = {};
-                   var graph = this.graph();
-                   var baseEntities = {};
-
-                   // clone base entities..
-                   Object.values(graph.base().entities).forEach(function(entity) {
-                       var copy = copyIntroEntity(entity);
-                       baseEntities[copy.id] = copy;
-                   });
+           if (prev) {
+             event.prevInResult = !inResult(prev, operation) || prev.isVertical() ? prev.prevInResult : prev;
+           }
+         } // check if the line segment belongs to the Boolean operation
 
-                   // replace base entities with head entities..
-                   Object.keys(graph.entities).forEach(function(id) {
-                       var entity = graph.entities[id];
-                       if (entity) {
-                           var copy = copyIntroEntity(entity);
-                           baseEntities[copy.id] = copy;
-                       } else {
-                           delete baseEntities[id];
-                       }
-                   });
 
-                   // swap temporary for permanent ids..
-                   Object.values(baseEntities).forEach(function(entity) {
-                       if (Array.isArray(entity.nodes)) {
-                           entity.nodes = entity.nodes.map(function(node) {
-                               return permIDs[node] || node;
-                           });
-                       }
-                       if (Array.isArray(entity.members)) {
-                           entity.members = entity.members.map(function(member) {
-                               member.id = permIDs[member.id] || member.id;
-                               return member;
-                           });
-                       }
-                   });
+         var isInResult = inResult(event, operation);
 
-                   return JSON.stringify({ dataIntroGraph: baseEntities });
+         if (isInResult) {
+           event.resultTransition = determineResultTransition(event, operation);
+         } else {
+           event.resultTransition = 0;
+         }
+       }
+       /* eslint-disable indent */
 
+       function inResult(event, operation) {
+         switch (event.type) {
+           case NORMAL:
+             switch (operation) {
+               case INTERSECTION:
+                 return !event.otherInOut;
 
-                   function copyIntroEntity(source) {
-                       var copy = utilObjectOmit(source, ['type', 'user', 'v', 'version', 'visible']);
+               case UNION:
+                 return event.otherInOut;
 
-                       // Note: the copy is no longer an osmEntity, so it might not have `tags`
-                       if (copy.tags && !Object.keys(copy.tags)) {
-                           delete copy.tags;
-                       }
+               case DIFFERENCE:
+                 // return (event.isSubject && !event.otherInOut) ||
+                 //         (!event.isSubject && event.otherInOut);
+                 return event.isSubject && event.otherInOut || !event.isSubject && !event.otherInOut;
 
-                       if (Array.isArray(copy.loc)) {
-                           copy.loc[0] = +copy.loc[0].toFixed(6);
-                           copy.loc[1] = +copy.loc[1].toFixed(6);
-                       }
+               case XOR:
+                 return true;
+             }
 
-                       var match = source.id.match(/([nrw])-\d*/);  // temporary id
-                       if (match !== null) {
-                           var nrw = match[1];
-                           var permID;
-                           do { permID = nrw + (++nextID[nrw]); }
-                           while (baseEntities.hasOwnProperty(permID));
+             break;
 
-                           copy.id = permIDs[source.id] = permID;
-                       }
-                       return copy;
-                   }
-               },
+           case SAME_TRANSITION:
+             return operation === INTERSECTION || operation === UNION;
 
+           case DIFFERENT_TRANSITION:
+             return operation === DIFFERENCE;
 
-               toJSON: function() {
-                   if (!this.hasChanges()) return;
+           case NON_CONTRIBUTING:
+             return false;
+         }
 
-                   var allEntities = {};
-                   var baseEntities = {};
-                   var base = _stack[0];
+         return false;
+       }
+       /* eslint-enable indent */
 
-                   var s = _stack.map(function(i) {
-                       var modified = [];
-                       var deleted = [];
 
-                       Object.keys(i.graph.entities).forEach(function(id) {
-                           var entity = i.graph.entities[id];
-                           if (entity) {
-                               var key = osmEntity.key(entity);
-                               allEntities[key] = entity;
-                               modified.push(key);
-                           } else {
-                               deleted.push(id);
-                           }
+       function determineResultTransition(event, operation) {
+         var thisIn = !event.inOut;
+         var thatIn = !event.otherInOut;
+         var isIn;
 
-                           // make sure that the originals of changed or deleted entities get merged
-                           // into the base of the _stack after restoring the data from JSON.
-                           if (id in base.graph.entities) {
-                               baseEntities[id] = base.graph.entities[id];
-                           }
-                           if (entity && entity.nodes) {
-                               // get originals of pre-existing child nodes
-                               entity.nodes.forEach(function(nodeID) {
-                                   if (nodeID in base.graph.entities) {
-                                       baseEntities[nodeID] = base.graph.entities[nodeID];
-                                   }
-                               });
-                           }
-                           // get originals of parent entities too
-                           var baseParents = base.graph._parentWays[id];
-                           if (baseParents) {
-                               baseParents.forEach(function(parentID) {
-                                   if (parentID in base.graph.entities) {
-                                       baseEntities[parentID] = base.graph.entities[parentID];
-                                   }
-                               });
-                           }
-                       });
+         switch (operation) {
+           case INTERSECTION:
+             isIn = thisIn && thatIn;
+             break;
 
-                       var x = {};
+           case UNION:
+             isIn = thisIn || thatIn;
+             break;
 
-                       if (modified.length) x.modified = modified;
-                       if (deleted.length) x.deleted = deleted;
-                       if (i.imageryUsed) x.imageryUsed = i.imageryUsed;
-                       if (i.photoOverlaysUsed) x.photoOverlaysUsed = i.photoOverlaysUsed;
-                       if (i.annotation) x.annotation = i.annotation;
-                       if (i.transform) x.transform = i.transform;
-                       if (i.selectedIDs) x.selectedIDs = i.selectedIDs;
+           case XOR:
+             isIn = thisIn ^ thatIn;
+             break;
 
-                       return x;
-                   });
+           case DIFFERENCE:
+             if (event.isSubject) {
+               isIn = thisIn && !thatIn;
+             } else {
+               isIn = thatIn && !thisIn;
+             }
 
-                   return JSON.stringify({
-                       version: 3,
-                       entities: Object.values(allEntities),
-                       baseEntities: Object.values(baseEntities),
-                       stack: s,
-                       nextIDs: osmEntity.id.next,
-                       index: _index,
-                       // note the time the changes were saved
-                       timestamp: (new Date()).getTime()
-                   });
-               },
+             break;
+         }
 
+         return isIn ? +1 : -1;
+       }
 
-               fromJSON: function(json, loadChildNodes) {
-                   var h = JSON.parse(json);
-                   var loadComplete = true;
+       var SweepEvent = /*#__PURE__*/function () {
+         /**
+          * Sweepline event
+          *
+          * @class {SweepEvent}
+          * @param {Array.<Number>}  point
+          * @param {Boolean}         left
+          * @param {SweepEvent=}     otherEvent
+          * @param {Boolean}         isSubject
+          * @param {Number}          edgeType
+          */
+         function SweepEvent(point, left, otherEvent, isSubject, edgeType) {
+           _classCallCheck(this, SweepEvent);
 
-                   osmEntity.id.next = h.nextIDs;
-                   _index = h.index;
+           /**
+            * Is left endpoint?
+            * @type {Boolean}
+            */
+           this.left = left;
+           /**
+            * @type {Array.<Number>}
+            */
 
-                   if (h.version === 2 || h.version === 3) {
-                       var allEntities = {};
+           this.point = point;
+           /**
+            * Other edge reference
+            * @type {SweepEvent}
+            */
 
-                       h.entities.forEach(function(entity) {
-                           allEntities[osmEntity.key(entity)] = osmEntity(entity);
-                       });
+           this.otherEvent = otherEvent;
+           /**
+            * Belongs to source or clipping polygon
+            * @type {Boolean}
+            */
 
-                       if (h.version === 3) {
-                           // This merges originals for changed entities into the base of
-                           // the _stack even if the current _stack doesn't have them (for
-                           // example when iD has been restarted in a different region)
-                           var baseEntities = h.baseEntities.map(function(d) { return osmEntity(d); });
-                           var stack = _stack.map(function(state) { return state.graph; });
-                           _stack[0].graph.rebase(baseEntities, stack, true);
-                           _tree.rebase(baseEntities, true);
-
-                           // When we restore a modified way, we also need to fetch any missing
-                           // childnodes that would normally have been downloaded with it.. #2142
-                           if (loadChildNodes) {
-                               var osm = context.connection();
-                               var baseWays = baseEntities
-                                   .filter(function(e) { return e.type === 'way'; });
-                               var nodeIDs = baseWays
-                                   .reduce(function(acc, way) { return utilArrayUnion(acc, way.nodes); }, []);
-                               var missing = nodeIDs
-                                   .filter(function(n) { return !_stack[0].graph.hasEntity(n); });
-
-                               if (missing.length && osm) {
-                                   loadComplete = false;
-                                   context.map().redrawEnable(false);
-
-                                   var loading = uiLoading(context).blocking(true);
-                                   context.container().call(loading);
-
-                                   var childNodesLoaded = function(err, result) {
-                                       if (!err) {
-                                           var visibleGroups = utilArrayGroupBy(result.data, 'visible');
-                                           var visibles = visibleGroups.true || [];      // alive nodes
-                                           var invisibles = visibleGroups.false || [];   // deleted nodes
-
-                                           if (visibles.length) {
-                                               var visibleIDs = visibles.map(function(entity) { return entity.id; });
-                                               var stack = _stack.map(function(state) { return state.graph; });
-                                               missing = utilArrayDifference(missing, visibleIDs);
-                                               _stack[0].graph.rebase(visibles, stack, true);
-                                               _tree.rebase(visibles, true);
-                                           }
-
-                                           // fetch older versions of nodes that were deleted..
-                                           invisibles.forEach(function(entity) {
-                                               osm.loadEntityVersion(entity.id, +entity.version - 1, childNodesLoaded);
-                                           });
-                                       }
-
-                                       if (err || !missing.length) {
-                                           loading.close();
-                                           context.map().redrawEnable(true);
-                                           dispatch$1.call('change');
-                                           dispatch$1.call('restore', this);
-                                       }
-                                   };
-
-                                   osm.loadMultiple(missing, childNodesLoaded);
-                               }
-                           }
-                       }
+           this.isSubject = isSubject;
+           /**
+            * Edge contribution type
+            * @type {Number}
+            */
 
-                       _stack = h.stack.map(function(d) {
-                           var entities = {}, entity;
+           this.type = edgeType || NORMAL;
+           /**
+            * In-out transition for the sweepline crossing polygon
+            * @type {Boolean}
+            */
 
-                           if (d.modified) {
-                               d.modified.forEach(function(key) {
-                                   entity = allEntities[key];
-                                   entities[entity.id] = entity;
-                               });
-                           }
+           this.inOut = false;
+           /**
+            * @type {Boolean}
+            */
 
-                           if (d.deleted) {
-                               d.deleted.forEach(function(id) {
-                                   entities[id] = undefined;
-                               });
-                           }
+           this.otherInOut = false;
+           /**
+            * Previous event in result?
+            * @type {SweepEvent}
+            */
 
-                           return {
-                               graph: coreGraph(_stack[0].graph).load(entities),
-                               annotation: d.annotation,
-                               imageryUsed: d.imageryUsed,
-                               photoOverlaysUsed: d.photoOverlaysUsed,
-                               transform: d.transform,
-                               selectedIDs: d.selectedIDs
-                           };
-                       });
+           this.prevInResult = null;
+           /**
+            * Type of result transition (0 = not in result, +1 = out-in, -1, in-out)
+            * @type {Number}
+            */
 
-                   } else { // original version
-                       _stack = h.stack.map(function(d) {
-                           var entities = {};
+           this.resultTransition = 0; // connection step
 
-                           for (var i in d.entities) {
-                               var entity = d.entities[i];
-                               entities[i] = entity === 'undefined' ? undefined : osmEntity(entity);
-                           }
+           /**
+            * @type {Number}
+            */
 
-                           d.graph = coreGraph(_stack[0].graph).load(entities);
-                           return d;
-                       });
-                   }
+           this.otherPos = -1;
+           /**
+            * @type {Number}
+            */
 
-                   var transform = _stack[_index].transform;
-                   if (transform) {
-                       context.map().transformEase(transform, 0);   // 0 = immediate, no easing
-                   }
+           this.outputContourId = -1;
+           this.isExteriorRing = true; // TODO: Looks unused, remove?
+         }
+         /**
+          * @param  {Array.<Number>}  p
+          * @return {Boolean}
+          */
 
-                   if (loadComplete) {
-                       dispatch$1.call('change');
-                       dispatch$1.call('restore', this);
-                   }
 
-                   return history;
-               },
+         _createClass(SweepEvent, [{
+           key: "isBelow",
+           value: function isBelow(p) {
+             var p0 = this.point,
+                 p1 = this.otherEvent.point;
+             return this.left ? (p0[0] - p[0]) * (p1[1] - p[1]) - (p1[0] - p[0]) * (p0[1] - p[1]) > 0 // signedArea(this.point, this.otherEvent.point, p) > 0 :
+             : (p1[0] - p[0]) * (p0[1] - p[1]) - (p0[0] - p[0]) * (p1[1] - p[1]) > 0; //signedArea(this.otherEvent.point, this.point, p) > 0;
+           }
+           /**
+            * @param  {Array.<Number>}  p
+            * @return {Boolean}
+            */
 
+         }, {
+           key: "isAbove",
+           value: function isAbove(p) {
+             return !this.isBelow(p);
+           }
+           /**
+            * @return {Boolean}
+            */
 
-               lock: function() {
-                   return lock.lock();
-               },
+         }, {
+           key: "isVertical",
+           value: function isVertical() {
+             return this.point[0] === this.otherEvent.point[0];
+           }
+           /**
+            * Does event belong to result?
+            * @return {Boolean}
+            */
 
+         }, {
+           key: "clone",
+           value: function clone() {
+             var copy = new SweepEvent(this.point, this.left, this.otherEvent, this.isSubject, this.type);
+             copy.contourId = this.contourId;
+             copy.resultTransition = this.resultTransition;
+             copy.prevInResult = this.prevInResult;
+             copy.isExteriorRing = this.isExteriorRing;
+             copy.inOut = this.inOut;
+             copy.otherInOut = this.otherInOut;
+             return copy;
+           }
+         }, {
+           key: "inResult",
+           get: function get() {
+             return this.resultTransition !== 0;
+           }
+         }]);
 
-               unlock: function() {
-                   lock.unlock();
-               },
+         return SweepEvent;
+       }();
 
+       function equals(p1, p2) {
+         if (p1[0] === p2[0]) {
+           if (p1[1] === p2[1]) {
+             return true;
+           } else {
+             return false;
+           }
+         }
 
-               save: function() {
-                   if (lock.locked() &&
-                       // don't overwrite existing, unresolved changes
-                       !_hasUnresolvedRestorableChanges) {
+         return false;
+       } // const EPSILON = 1e-9;
+       // const abs = Math.abs;
+       // TODO https://github.com/w8r/martinez/issues/6#issuecomment-262847164
+       // Precision problem.
+       //
+       // module.exports = function equals(p1, p2) {
+       //   return abs(p1[0] - p2[0]) <= EPSILON && abs(p1[1] - p2[1]) <= EPSILON;
+       // };
 
-                       corePreferences(getKey('saved_history'), history.toJSON() || null);
-                   }
-                   return history;
-               },
+       var epsilon$1 = 1.1102230246251565e-16;
+       var splitter = 134217729;
+       var resulterrbound = (3 + 8 * epsilon$1) * epsilon$1; // fast_expansion_sum_zeroelim routine from oritinal code
 
+       function sum(elen, e, flen, f, h) {
+         var Q, Qnew, hh, bvirt;
+         var enow = e[0];
+         var fnow = f[0];
+         var eindex = 0;
+         var findex = 0;
 
-               // delete the history version saved in localStorage
-               clearSaved: function() {
-                   context.debouncedSave.cancel();
-                   if (lock.locked()) {
-                       _hasUnresolvedRestorableChanges = false;
-                       corePreferences(getKey('saved_history'), null);
+         if (fnow > enow === fnow > -enow) {
+           Q = enow;
+           enow = e[++eindex];
+         } else {
+           Q = fnow;
+           fnow = f[++findex];
+         }
 
-                       // clear the changeset metadata associated with the saved history
-                       corePreferences('comment', null);
-                       corePreferences('hashtags', null);
-                       corePreferences('source', null);
-                   }
-                   return history;
-               },
+         var hindex = 0;
 
+         if (eindex < elen && findex < flen) {
+           if (fnow > enow === fnow > -enow) {
+             Qnew = enow + Q;
+             hh = Q - (Qnew - enow);
+             enow = e[++eindex];
+           } else {
+             Qnew = fnow + Q;
+             hh = Q - (Qnew - fnow);
+             fnow = f[++findex];
+           }
 
-               savedHistoryJSON: function() {
-                   return corePreferences(getKey('saved_history'));
-               },
+           Q = Qnew;
 
+           if (hh !== 0) {
+             h[hindex++] = hh;
+           }
 
-               hasRestorableChanges: function() {
-                   return _hasUnresolvedRestorableChanges;
-               },
+           while (eindex < elen && findex < flen) {
+             if (fnow > enow === fnow > -enow) {
+               Qnew = Q + enow;
+               bvirt = Qnew - Q;
+               hh = Q - (Qnew - bvirt) + (enow - bvirt);
+               enow = e[++eindex];
+             } else {
+               Qnew = Q + fnow;
+               bvirt = Qnew - Q;
+               hh = Q - (Qnew - bvirt) + (fnow - bvirt);
+               fnow = f[++findex];
+             }
 
+             Q = Qnew;
 
-               // load history from a version stored in localStorage
-               restore: function() {
-                   if (lock.locked()) {
-                       _hasUnresolvedRestorableChanges = false;
-                       var json = this.savedHistoryJSON();
-                       if (json) history.fromJSON(json, true);
-                   }
-               },
+             if (hh !== 0) {
+               h[hindex++] = hh;
+             }
+           }
+         }
 
+         while (eindex < elen) {
+           Qnew = Q + enow;
+           bvirt = Qnew - Q;
+           hh = Q - (Qnew - bvirt) + (enow - bvirt);
+           enow = e[++eindex];
+           Q = Qnew;
 
-               _getKey: getKey
+           if (hh !== 0) {
+             h[hindex++] = hh;
+           }
+         }
 
-           };
+         while (findex < flen) {
+           Qnew = Q + fnow;
+           bvirt = Qnew - Q;
+           hh = Q - (Qnew - bvirt) + (fnow - bvirt);
+           fnow = f[++findex];
+           Q = Qnew;
 
+           if (hh !== 0) {
+             h[hindex++] = hh;
+           }
+         }
 
-           history.reset();
+         if (Q !== 0 || hindex === 0) {
+           h[hindex++] = Q;
+         }
 
-           return utilRebind(history, dispatch$1, 'on');
+         return hindex;
        }
+       function estimate(elen, e) {
+         var Q = e[0];
 
-       /**
-        * Look for roads that can be connected to other roads with a short extension
-        */
-       function validationAlmostJunction(context) {
-         const type = 'almost_junction';
-         const EXTEND_TH_METERS = 5;
-         const WELD_TH_METERS = 0.75;
-         // Comes from considering bounding case of parallel ways
-         const CLOSE_NODE_TH = EXTEND_TH_METERS - WELD_TH_METERS;
-         // Comes from considering bounding case of perpendicular ways
-         const SIG_ANGLE_TH = Math.atan(WELD_TH_METERS / EXTEND_TH_METERS);
-
-         function isHighway(entity) {
-           return entity.type === 'way'
-             && osmRoutableHighwayTagValues[entity.tags.highway];
+         for (var i = 1; i < elen; i++) {
+           Q += e[i];
          }
 
-         function isTaggedAsNotContinuing(node) {
-           return node.tags.noexit === 'yes'
-             || node.tags.amenity === 'parking_entrance'
-             || (node.tags.entrance && node.tags.entrance !== 'no');
-         }
+         return Q;
+       }
+       function vec(n) {
+         return new Float64Array(n);
+       }
 
+       var ccwerrboundA = (3 + 16 * epsilon$1) * epsilon$1;
+       var ccwerrboundB = (2 + 12 * epsilon$1) * epsilon$1;
+       var ccwerrboundC = (9 + 64 * epsilon$1) * epsilon$1 * epsilon$1;
+       var B = vec(4);
+       var C1 = vec(8);
+       var C2 = vec(12);
+       var D = vec(16);
+       var u = vec(4);
 
-         const validation = function checkAlmostJunction(entity, graph) {
-           if (!isHighway(entity)) return [];
-           if (entity.isDegenerate()) return [];
+       function orient2dadapt(ax, ay, bx, by, cx, cy, detsum) {
+         var acxtail, acytail, bcxtail, bcytail;
+
+         var bvirt, c, ahi, alo, bhi, blo, _i, _j, _0, s1, s0, t1, t0, u3;
+
+         var acx = ax - cx;
+         var bcx = bx - cx;
+         var acy = ay - cy;
+         var bcy = by - cy;
+         s1 = acx * bcy;
+         c = splitter * acx;
+         ahi = c - (c - acx);
+         alo = acx - ahi;
+         c = splitter * bcy;
+         bhi = c - (c - bcy);
+         blo = bcy - bhi;
+         s0 = alo * blo - (s1 - ahi * bhi - alo * bhi - ahi * blo);
+         t1 = acy * bcx;
+         c = splitter * acy;
+         ahi = c - (c - acy);
+         alo = acy - ahi;
+         c = splitter * bcx;
+         bhi = c - (c - bcx);
+         blo = bcx - bhi;
+         t0 = alo * blo - (t1 - ahi * bhi - alo * bhi - ahi * blo);
+         _i = s0 - t0;
+         bvirt = s0 - _i;
+         B[0] = s0 - (_i + bvirt) + (bvirt - t0);
+         _j = s1 + _i;
+         bvirt = _j - s1;
+         _0 = s1 - (_j - bvirt) + (_i - bvirt);
+         _i = _0 - t1;
+         bvirt = _0 - _i;
+         B[1] = _0 - (_i + bvirt) + (bvirt - t1);
+         u3 = _j + _i;
+         bvirt = u3 - _j;
+         B[2] = _j - (u3 - bvirt) + (_i - bvirt);
+         B[3] = u3;
+         var det = estimate(4, B);
+         var errbound = ccwerrboundB * detsum;
 
-           const tree = context.history().tree();
-           const extendableNodeInfos = findConnectableEndNodesByExtension(entity);
+         if (det >= errbound || -det >= errbound) {
+           return det;
+         }
+
+         bvirt = ax - acx;
+         acxtail = ax - (acx + bvirt) + (bvirt - cx);
+         bvirt = bx - bcx;
+         bcxtail = bx - (bcx + bvirt) + (bvirt - cx);
+         bvirt = ay - acy;
+         acytail = ay - (acy + bvirt) + (bvirt - cy);
+         bvirt = by - bcy;
+         bcytail = by - (bcy + bvirt) + (bvirt - cy);
+
+         if (acxtail === 0 && acytail === 0 && bcxtail === 0 && bcytail === 0) {
+           return det;
+         }
+
+         errbound = ccwerrboundC * detsum + resulterrbound * Math.abs(det);
+         det += acx * bcytail + bcy * acxtail - (acy * bcxtail + bcx * acytail);
+         if (det >= errbound || -det >= errbound) return det;
+         s1 = acxtail * bcy;
+         c = splitter * acxtail;
+         ahi = c - (c - acxtail);
+         alo = acxtail - ahi;
+         c = splitter * bcy;
+         bhi = c - (c - bcy);
+         blo = bcy - bhi;
+         s0 = alo * blo - (s1 - ahi * bhi - alo * bhi - ahi * blo);
+         t1 = acytail * bcx;
+         c = splitter * acytail;
+         ahi = c - (c - acytail);
+         alo = acytail - ahi;
+         c = splitter * bcx;
+         bhi = c - (c - bcx);
+         blo = bcx - bhi;
+         t0 = alo * blo - (t1 - ahi * bhi - alo * bhi - ahi * blo);
+         _i = s0 - t0;
+         bvirt = s0 - _i;
+         u[0] = s0 - (_i + bvirt) + (bvirt - t0);
+         _j = s1 + _i;
+         bvirt = _j - s1;
+         _0 = s1 - (_j - bvirt) + (_i - bvirt);
+         _i = _0 - t1;
+         bvirt = _0 - _i;
+         u[1] = _0 - (_i + bvirt) + (bvirt - t1);
+         u3 = _j + _i;
+         bvirt = u3 - _j;
+         u[2] = _j - (u3 - bvirt) + (_i - bvirt);
+         u[3] = u3;
+         var C1len = sum(4, B, 4, u, C1);
+         s1 = acx * bcytail;
+         c = splitter * acx;
+         ahi = c - (c - acx);
+         alo = acx - ahi;
+         c = splitter * bcytail;
+         bhi = c - (c - bcytail);
+         blo = bcytail - bhi;
+         s0 = alo * blo - (s1 - ahi * bhi - alo * bhi - ahi * blo);
+         t1 = acy * bcxtail;
+         c = splitter * acy;
+         ahi = c - (c - acy);
+         alo = acy - ahi;
+         c = splitter * bcxtail;
+         bhi = c - (c - bcxtail);
+         blo = bcxtail - bhi;
+         t0 = alo * blo - (t1 - ahi * bhi - alo * bhi - ahi * blo);
+         _i = s0 - t0;
+         bvirt = s0 - _i;
+         u[0] = s0 - (_i + bvirt) + (bvirt - t0);
+         _j = s1 + _i;
+         bvirt = _j - s1;
+         _0 = s1 - (_j - bvirt) + (_i - bvirt);
+         _i = _0 - t1;
+         bvirt = _0 - _i;
+         u[1] = _0 - (_i + bvirt) + (bvirt - t1);
+         u3 = _j + _i;
+         bvirt = u3 - _j;
+         u[2] = _j - (u3 - bvirt) + (_i - bvirt);
+         u[3] = u3;
+         var C2len = sum(C1len, C1, 4, u, C2);
+         s1 = acxtail * bcytail;
+         c = splitter * acxtail;
+         ahi = c - (c - acxtail);
+         alo = acxtail - ahi;
+         c = splitter * bcytail;
+         bhi = c - (c - bcytail);
+         blo = bcytail - bhi;
+         s0 = alo * blo - (s1 - ahi * bhi - alo * bhi - ahi * blo);
+         t1 = acytail * bcxtail;
+         c = splitter * acytail;
+         ahi = c - (c - acytail);
+         alo = acytail - ahi;
+         c = splitter * bcxtail;
+         bhi = c - (c - bcxtail);
+         blo = bcxtail - bhi;
+         t0 = alo * blo - (t1 - ahi * bhi - alo * bhi - ahi * blo);
+         _i = s0 - t0;
+         bvirt = s0 - _i;
+         u[0] = s0 - (_i + bvirt) + (bvirt - t0);
+         _j = s1 + _i;
+         bvirt = _j - s1;
+         _0 = s1 - (_j - bvirt) + (_i - bvirt);
+         _i = _0 - t1;
+         bvirt = _0 - _i;
+         u[1] = _0 - (_i + bvirt) + (bvirt - t1);
+         u3 = _j + _i;
+         bvirt = u3 - _j;
+         u[2] = _j - (u3 - bvirt) + (_i - bvirt);
+         u[3] = u3;
+         var Dlen = sum(C2len, C2, 4, u, D);
+         return D[Dlen - 1];
+       }
 
-           let issues = [];
+       function orient2d(ax, ay, bx, by, cx, cy) {
+         var detleft = (ay - cy) * (bx - cx);
+         var detright = (ax - cx) * (by - cy);
+         var det = detleft - detright;
+         if (detleft === 0 || detright === 0 || detleft > 0 !== detright > 0) return det;
+         var detsum = Math.abs(detleft + detright);
+         if (Math.abs(det) >= ccwerrboundA * detsum) return det;
+         return -orient2dadapt(ax, ay, bx, by, cx, cy, detsum);
+       }
 
-           extendableNodeInfos.forEach(extendableNodeInfo => {
-             issues.push(new validationIssue({
-               type,
-               subtype: 'highway-highway',
-               severity: 'warning',
-               message(context) {
-                 const entity1 = context.hasEntity(this.entityIds[0]);
-                 if (this.entityIds[0] === this.entityIds[2]) {
-                   return entity1 ? _t('issues.almost_junction.self.message', {
-                     feature: utilDisplayLabel(entity1, context.graph())
-                   }) : '';
-                 } else {
-                   const entity2 = context.hasEntity(this.entityIds[2]);
-                   return (entity1 && entity2) ? _t('issues.almost_junction.message', {
-                     feature: utilDisplayLabel(entity1, context.graph()),
-                     feature2: utilDisplayLabel(entity2, context.graph())
-                   }) : '';
-                 }
-               },
-               reference: showReference,
-               entityIds: [
-                 entity.id,
-                 extendableNodeInfo.node.id,
-                 extendableNodeInfo.wid,
-               ],
-               loc: extendableNodeInfo.node.loc,
-               hash: JSON.stringify(extendableNodeInfo.node.loc),
-               data: {
-                 midId: extendableNodeInfo.mid.id,
-                 edge: extendableNodeInfo.edge,
-                 cross_loc: extendableNodeInfo.cross_loc
-               },
-               dynamicFixes: makeFixes
-             }));
-           });
+       /**
+        * Signed area of the triangle (p0, p1, p2)
+        * @param  {Array.<Number>} p0
+        * @param  {Array.<Number>} p1
+        * @param  {Array.<Number>} p2
+        * @return {Number}
+        */
 
-           return issues;
+       function signedArea(p0, p1, p2) {
+         var res = orient2d(p0[0], p0[1], p1[0], p1[1], p2[0], p2[1]);
+         if (res > 0) return -1;
+         if (res < 0) return 1;
+         return 0;
+       }
 
-           function makeFixes(context) {
-             let fixes = [new validationIssueFix({
-               icon: 'iD-icon-abutment',
-               title: _t('issues.fix.connect_features.title'),
-               onClick(context) {
-                 const annotation = _t('issues.fix.connect_almost_junction.annotation');
-                 const [, endNodeId, crossWayId] = this.issue.entityIds;
-                 const midNode = context.entity(this.issue.data.midId);
-                 const endNode = context.entity(endNodeId);
-                 const crossWay = context.entity(crossWayId);
-
-                 // When endpoints are close, just join if resulting small change in angle (#7201)
-                 const nearEndNodes = findNearbyEndNodes(endNode, crossWay);
-                 if (nearEndNodes.length > 0) {
-                   const collinear = findSmallJoinAngle(midNode, endNode, nearEndNodes);
-                   if (collinear) {
-                     context.perform(
-                       actionMergeNodes([collinear.id, endNode.id], collinear.loc),
-                       annotation
-                     );
-                     return;
-                   }
-                 }
+       /**
+        * @param  {SweepEvent} e1
+        * @param  {SweepEvent} e2
+        * @return {Number}
+        */
 
-                 const targetEdge = this.issue.data.edge;
-                 const crossLoc = this.issue.data.cross_loc;
-                 const edgeNodes = [context.entity(targetEdge[0]), context.entity(targetEdge[1])];
-                 const closestNodeInfo = geoSphericalClosestNode(edgeNodes, crossLoc);
+       function compareEvents(e1, e2) {
+         var p1 = e1.point;
+         var p2 = e2.point; // Different x-coordinate
 
-                 // already a point nearby, just connect to that
-                 if (closestNodeInfo.distance < WELD_TH_METERS) {
-                   context.perform(
-                     actionMergeNodes([closestNodeInfo.node.id, endNode.id], closestNodeInfo.node.loc),
-                     annotation
-                   );
-                 // else add the end node to the edge way
-                 } else {
-                   context.perform(
-                     actionAddMidpoint({loc: crossLoc, edge: targetEdge}, endNode),
-                     annotation
-                   );
-                 }
-               }
-             })];
+         if (p1[0] > p2[0]) return 1;
+         if (p1[0] < p2[0]) return -1; // Different points, but same x-coordinate
+         // Event with lower y-coordinate is processed first
 
-             const node = context.hasEntity(this.entityIds[1]);
-             if (node && !node.hasInterestingTags()) {
-               // node has no descriptive tags, suggest noexit fix
-               fixes.push(new validationIssueFix({
-                 icon: 'maki-barrier',
-                 title: _t('issues.fix.tag_as_disconnected.title'),
-                 onClick(context) {
-                   const nodeID = this.issue.entityIds[1];
-                   const tags = Object.assign({}, context.entity(nodeID).tags);
-                   tags.noexit = 'yes';
-                   context.perform(
-                     actionChangeTags(nodeID, tags),
-                     _t('issues.fix.tag_as_disconnected.annotation')
-                   );
-                 }
-               }));
-             }
+         if (p1[1] !== p2[1]) return p1[1] > p2[1] ? 1 : -1;
+         return specialCases(e1, e2, p1);
+       }
+       /* eslint-disable no-unused-vars */
 
-             return fixes;
-           }
+       function specialCases(e1, e2, p1, p2) {
+         // Same coordinates, but one is a left endpoint and the other is
+         // a right endpoint. The right endpoint is processed first
+         if (e1.left !== e2.left) return e1.left ? 1 : -1; // const p2 = e1.otherEvent.point, p3 = e2.otherEvent.point;
+         // const sa = (p1[0] - p3[0]) * (p2[1] - p3[1]) - (p2[0] - p3[0]) * (p1[1] - p3[1])
+         // Same coordinates, both events
+         // are left endpoints or right endpoints.
+         // not collinear
 
-           function showReference(selection) {
-             selection.selectAll('.issue-reference')
-               .data([0])
-               .enter()
-               .append('div')
-               .attr('class', 'issue-reference')
-               .text(_t('issues.almost_junction.highway-highway.reference'));
-           }
+         if (signedArea(p1, e1.otherEvent.point, e2.otherEvent.point) !== 0) {
+           // the event associate to the bottom segment is processed first
+           return !e1.isBelow(e2.otherEvent.point) ? 1 : -1;
+         }
 
-           function isExtendableCandidate(node, way) {
-             // can not accurately test vertices on tiles not downloaded from osm - #5938
-             const osm = services.osm;
-             if (osm && !osm.isDataLoaded(node.loc)) {
-               return false;
-             }
-             if (isTaggedAsNotContinuing(node) || graph.parentWays(node).length !== 1) {
-               return false;
-             }
+         return !e1.isSubject && e2.isSubject ? 1 : -1;
+       }
+       /* eslint-enable no-unused-vars */
 
-             let occurences = 0;
-             for (const index in way.nodes) {
-               if (way.nodes[index] === node.id) {
-                 occurences += 1;
-                 if (occurences > 1) {
-                   return false;
-                 }
-               }
-             }
-             return true;
-           }
+       /**
+        * @param  {SweepEvent} se
+        * @param  {Array.<Number>} p
+        * @param  {Queue} queue
+        * @return {Queue}
+        */
 
-           function findConnectableEndNodesByExtension(way) {
-             let results = [];
-             if (way.isClosed()) return results;
+       function divideSegment(se, p, queue) {
+         var r = new SweepEvent(p, false, se, se.isSubject);
+         var l = new SweepEvent(p, true, se.otherEvent, se.isSubject);
+         /* eslint-disable no-console */
 
-             let testNodes;
-             const indices = [0, way.nodes.length - 1];
-             indices.forEach(nodeIndex => {
-               const nodeID = way.nodes[nodeIndex];
-               const node = graph.entity(nodeID);
+         if (equals(se.point, se.otherEvent.point)) {
+           console.warn('what is that, a collapsed segment?', se);
+         }
+         /* eslint-enable no-console */
 
-               if (!isExtendableCandidate(node, way)) return;
 
-               const connectionInfo = canConnectByExtend(way, nodeIndex);
-               if (!connectionInfo) return;
+         r.contourId = l.contourId = se.contourId; // avoid a rounding error. The left event would be processed after the right event
 
-               testNodes = graph.childNodes(way).slice();   // shallow copy
-               testNodes[nodeIndex] = testNodes[nodeIndex].move(connectionInfo.cross_loc);
+         if (compareEvents(l, se.otherEvent) > 0) {
+           se.otherEvent.left = true;
+           l.left = false;
+         } // avoid a rounding error. The left event would be processed after the right event
+         // if (compareEvents(se, r) > 0) {}
 
-               // don't flag issue if connecting the ways would cause self-intersection
-               if (geoHasSelfIntersections(testNodes, nodeID)) return;
 
-               results.push(connectionInfo);
-             });
+         se.otherEvent.otherEvent = l;
+         se.otherEvent = r;
+         queue.push(l);
+         queue.push(r);
+         return queue;
+       }
 
-             return results;
-           }
+       //const EPS = 1e-9;
 
-           function findNearbyEndNodes(node, way) {
-             return [
-               way.nodes[0],
-               way.nodes[way.nodes.length - 1]
-             ].map(d => graph.entity(d))
-             .filter(d => {
-               // Node cannot be near to itself, but other endnode of same way could be
-               return d.id !== node.id
-                 && geoSphericalDistance(node.loc, d.loc) <= CLOSE_NODE_TH;
-             });
-           }
+       /**
+        * Finds the magnitude of the cross product of two vectors (if we pretend
+        * they're in three dimensions)
+        *
+        * @param {Object} a First vector
+        * @param {Object} b Second vector
+        * @private
+        * @returns {Number} The magnitude of the cross product
+        */
+       function crossProduct(a, b) {
+         return a[0] * b[1] - a[1] * b[0];
+       }
+       /**
+        * Finds the dot product of two vectors.
+        *
+        * @param {Object} a First vector
+        * @param {Object} b Second vector
+        * @private
+        * @returns {Number} The dot product
+        */
 
-           function findSmallJoinAngle(midNode, tipNode, endNodes) {
-             // Both nodes could be close, so want to join whichever is closest to collinear
-             let joinTo;
-             let minAngle = Infinity;
 
-             // Checks midNode -> tipNode -> endNode for collinearity
-             endNodes.forEach(endNode => {
-               const a1 = geoAngle(midNode, tipNode, context.projection) + Math.PI;
-               const a2 = geoAngle(midNode, endNode, context.projection) + Math.PI;
-               const diff = Math.max(a1, a2) - Math.min(a1, a2);
+       function dotProduct(a, b) {
+         return a[0] * b[0] + a[1] * b[1];
+       }
+       /**
+        * Finds the intersection (if any) between two line segments a and b, given the
+        * line segments' end points a1, a2 and b1, b2.
+        *
+        * This algorithm is based on Schneider and Eberly.
+        * http://www.cimec.org.ar/~ncalvo/Schneider_Eberly.pdf
+        * Page 244.
+        *
+        * @param {Array.<Number>} a1 point of first line
+        * @param {Array.<Number>} a2 point of first line
+        * @param {Array.<Number>} b1 point of second line
+        * @param {Array.<Number>} b2 point of second line
+        * @param {Boolean=}       noEndpointTouch whether to skip single touchpoints
+        *                                         (meaning connected segments) as
+        *                                         intersections
+        * @returns {Array.<Array.<Number>>|Null} If the lines intersect, the point of
+        * intersection. If they overlap, the two end points of the overlapping segment.
+        * Otherwise, null.
+        */
 
-               if (diff < minAngle) {
-                 joinTo = endNode;
-                 minAngle = diff;
-               }
-             });
 
-             /* Threshold set by considering right angle triangle
-             based on node joining threshold and extension distance */
-             if (minAngle <= SIG_ANGLE_TH) return joinTo;
+       function intersection (a1, a2, b1, b2, noEndpointTouch) {
+         // The algorithm expects our lines in the form P + sd, where P is a point,
+         // s is on the interval [0, 1], and d is a vector.
+         // We are passed two points. P can be the first point of each pair. The
+         // vector, then, could be thought of as the distance (in x and y components)
+         // from the first point to the second point.
+         // So first, let's make our vectors:
+         var va = [a2[0] - a1[0], a2[1] - a1[1]];
+         var vb = [b2[0] - b1[0], b2[1] - b1[1]]; // We also define a function to convert back to regular point form:
 
-             return null;
-           }
+         /* eslint-disable arrow-body-style */
 
-           function hasTag(tags, key) {
-             return tags[key] !== undefined && tags[key] !== 'no';
-           }
+         function toPoint(p, s, d) {
+           return [p[0] + s * d[0], p[1] + s * d[1]];
+         }
+         /* eslint-enable arrow-body-style */
+         // The rest is pretty much a straight port of the algorithm.
 
-           function canConnectWays(way, way2) {
 
-             // allow self-connections
-             if (way.id === way2.id) return true;
+         var e = [b1[0] - a1[0], b1[1] - a1[1]];
+         var kross = crossProduct(va, vb);
+         var sqrKross = kross * kross;
+         var sqrLenA = dotProduct(va, va); //const sqrLenB  = dotProduct(vb, vb);
+         // Check for line intersection. This works because of the properties of the
+         // cross product -- specifically, two vectors are parallel if and only if the
+         // cross product is the 0 vector. The full calculation involves relative error
+         // to account for possible very small line segments. See Schneider & Eberly
+         // for details.
 
-             // if one is bridge or tunnel, both must be bridge or tunnel
-             if ((hasTag(way.tags, 'bridge') || hasTag(way2.tags, 'bridge')) &&
-               !(hasTag(way.tags, 'bridge') && hasTag(way2.tags, 'bridge'))) return false;
-             if ((hasTag(way.tags, 'tunnel') || hasTag(way2.tags, 'tunnel')) &&
-               !(hasTag(way.tags, 'tunnel') && hasTag(way2.tags, 'tunnel'))) return false;
+         if (sqrKross > 0
+         /* EPS * sqrLenB * sqLenA */
+         ) {
+             // If they're not parallel, then (because these are line segments) they
+             // still might not actually intersect. This code checks that the
+             // intersection point of the lines is actually on both line segments.
+             var s = crossProduct(e, vb) / kross;
 
-             // must have equivalent layers and levels
-             const layer1 = way.tags.layer || '0',
-               layer2 = way2.tags.layer || '0';
-             if (layer1 !== layer2) return false;
+             if (s < 0 || s > 1) {
+               // not on line segment a
+               return null;
+             }
 
-             const level1 = way.tags.level || '0',
-               level2 = way2.tags.level || '0';
-             if (level1 !== level2) return false;
+             var t = crossProduct(e, va) / kross;
 
-             return true;
-           }
+             if (t < 0 || t > 1) {
+               // not on line segment b
+               return null;
+             }
 
-           function canConnectByExtend(way, endNodeIdx) {
-             const tipNid = way.nodes[endNodeIdx];  // the 'tip' node for extension point
-             const midNid = endNodeIdx === 0 ? way.nodes[1] : way.nodes[way.nodes.length - 2];  // the other node of the edge
-             const tipNode = graph.entity(tipNid);
-             const midNode = graph.entity(midNid);
-             const lon = tipNode.loc[0];
-             const lat = tipNode.loc[1];
-             const lon_range = geoMetersToLon(EXTEND_TH_METERS, lat) / 2;
-             const lat_range = geoMetersToLat(EXTEND_TH_METERS) / 2;
-             const queryExtent = geoExtent([
-               [lon - lon_range, lat - lat_range],
-               [lon + lon_range, lat + lat_range]
-             ]);
-
-             // first, extend the edge of [midNode -> tipNode] by EXTEND_TH_METERS and find the "extended tip" location
-             const edgeLen = geoSphericalDistance(midNode.loc, tipNode.loc);
-             const t = EXTEND_TH_METERS / edgeLen + 1.0;
-             const extTipLoc = geoVecInterp(midNode.loc, tipNode.loc, t);
-
-             // then, check if the extension part [tipNode.loc -> extTipLoc] intersects any other ways
-             const segmentInfos = tree.waySegments(queryExtent, graph);
-             for (let i = 0; i < segmentInfos.length; i++) {
-               let segmentInfo = segmentInfos[i];
-
-               let way2 = graph.entity(segmentInfo.wayId);
+             if (s === 0 || s === 1) {
+               // on an endpoint of line segment a
+               return noEndpointTouch ? null : [toPoint(a1, s, va)];
+             }
 
-               if (!isHighway(way2)) continue;
+             if (t === 0 || t === 1) {
+               // on an endpoint of line segment b
+               return noEndpointTouch ? null : [toPoint(b1, t, vb)];
+             }
 
-               if (!canConnectWays(way, way2)) continue;
+             return [toPoint(a1, s, va)];
+           } // If we've reached this point, then the lines are either parallel or the
+         // same, but the segments could overlap partially or fully, or not at all.
+         // So we need to find the overlap, if any. To do that, we can use e, which is
+         // the (vector) difference between the two initial points. If this is parallel
+         // with the line itself, then the two lines are the same line, and there will
+         // be overlap.
+         //const sqrLenE = dotProduct(e, e);
 
-               let nAid = segmentInfo.nodes[0],
-                 nBid = segmentInfo.nodes[1];
 
-               if (nAid === tipNid || nBid === tipNid) continue;
+         kross = crossProduct(e, va);
+         sqrKross = kross * kross;
 
-               let nA = graph.entity(nAid),
-                 nB = graph.entity(nBid);
-               let crossLoc = geoLineIntersection([tipNode.loc, extTipLoc], [nA.loc, nB.loc]);
-               if (crossLoc) {
-                 return {
-                   mid: midNode,
-                   node: tipNode,
-                   wid: way2.id,
-                   edge: [nA.id, nB.id],
-                   cross_loc: crossLoc
-                 };
-               }
-             }
+         if (sqrKross > 0
+         /* EPS * sqLenB * sqLenE */
+         ) {
+             // Lines are just parallel, not the same. No overlap.
              return null;
            }
-         };
-
-         validation.type = type;
 
-         return validation;
-       }
+         var sa = dotProduct(va, e) / sqrLenA;
+         var sb = sa + dotProduct(va, vb) / sqrLenA;
+         var smin = Math.min(sa, sb);
+         var smax = Math.max(sa, sb); // this is, essentially, the FindIntersection acting on floats from
+         // Schneider & Eberly, just inlined into this function.
 
-       function validationCloseNodes(context) {
-           var type = 'close_nodes';
+         if (smin <= 1 && smax >= 0) {
+           // overlap on an end point
+           if (smin === 1) {
+             return noEndpointTouch ? null : [toPoint(a1, smin > 0 ? smin : 0, va)];
+           }
 
-           var pointThresholdMeters = 0.2;
+           if (smax === 0) {
+             return noEndpointTouch ? null : [toPoint(a1, smax < 1 ? smax : 1, va)];
+           }
 
-           var validation = function(entity, graph) {
-               if (entity.type === 'node') {
-                   return getIssuesForNode(entity);
-               } else if (entity.type === 'way') {
-                   return getIssuesForWay(entity);
-               }
-               return [];
+           if (noEndpointTouch && smin === 0 && smax === 1) return null; // There's overlap on a segment -- two points of intersection. Return both.
 
-               function getIssuesForNode(node) {
-                   var parentWays = graph.parentWays(node);
-                   if (parentWays.length) {
-                       return getIssuesForVertex(node, parentWays);
-                   } else {
-                       return getIssuesForDetachedPoint(node);
-                   }
-               }
+           return [toPoint(a1, smin > 0 ? smin : 0, va), toPoint(a1, smax < 1 ? smax : 1, va)];
+         }
 
-               function wayTypeFor(way) {
+         return null;
+       }
 
-                   if (way.tags.boundary && way.tags.boundary !== 'no') return 'boundary';
-                   if (way.tags.indoor && way.tags.indoor !== 'no') return 'indoor';
-                   if ((way.tags.building && way.tags.building !== 'no') ||
-                       (way.tags['building:part'] && way.tags['building:part'] !== 'no')) return 'building';
-                   if (osmPathHighwayTagValues[way.tags.highway]) return 'path';
+       /**
+        * @param  {SweepEvent} se1
+        * @param  {SweepEvent} se2
+        * @param  {Queue}      queue
+        * @return {Number}
+        */
 
-                   var parentRelations = graph.parentRelations(way);
-                   for (var i in parentRelations) {
-                       var relation = parentRelations[i];
+       function possibleIntersection(se1, se2, queue) {
+         // that disallows self-intersecting polygons,
+         // did cost us half a day, so I'll leave it
+         // out of respect
+         // if (se1.isSubject === se2.isSubject) return;
+         var inter = intersection(se1.point, se1.otherEvent.point, se2.point, se2.otherEvent.point);
+         var nintersections = inter ? inter.length : 0;
+         if (nintersections === 0) return 0; // no intersection
+         // the line segments intersect at an endpoint of both line segments
 
-                       if (relation.tags.type === 'boundary') return 'boundary';
+         if (nintersections === 1 && (equals(se1.point, se2.point) || equals(se1.otherEvent.point, se2.otherEvent.point))) {
+           return 0;
+         }
 
-                       if (relation.isMultipolygon()) {
-                           if (relation.tags.indoor && relation.tags.indoor !== 'no') return 'indoor';
-                           if ((relation.tags.building && relation.tags.building !== 'no') ||
-                               (relation.tags['building:part'] && relation.tags['building:part'] !== 'no')) return 'building';
-                       }
-                   }
+         if (nintersections === 2 && se1.isSubject === se2.isSubject) {
+           // if(se1.contourId === se2.contourId){
+           // console.warn('Edges of the same polygon overlap',
+           //   se1.point, se1.otherEvent.point, se2.point, se2.otherEvent.point);
+           // }
+           //throw new Error('Edges of the same polygon overlap');
+           return 0;
+         } // The line segments associated to se1 and se2 intersect
 
-                   return 'other';
-               }
 
-               function shouldCheckWay(way) {
+         if (nintersections === 1) {
+           // if the intersection point is not an endpoint of se1
+           if (!equals(se1.point, inter[0]) && !equals(se1.otherEvent.point, inter[0])) {
+             divideSegment(se1, inter[0], queue);
+           } // if the intersection point is not an endpoint of se2
 
-                   // don't flag issues where merging would create degenerate ways
-                   if (way.nodes.length <= 2 ||
-                       (way.isClosed() && way.nodes.length <= 4)) return false;
 
-                   var bbox = way.extent(graph).bbox();
-                   var hypotenuseMeters = geoSphericalDistance([bbox.minX, bbox.minY], [bbox.maxX, bbox.maxY]);
-                   // don't flag close nodes in very small ways
-                   if (hypotenuseMeters < 1.5) return false;
+           if (!equals(se2.point, inter[0]) && !equals(se2.otherEvent.point, inter[0])) {
+             divideSegment(se2, inter[0], queue);
+           }
 
-                   return true;
-               }
+           return 1;
+         } // The line segments associated to se1 and se2 overlap
 
-               function getIssuesForWay(way) {
-                   if (!shouldCheckWay(way)) return [];
 
-                   var issues = [],
-                       nodes = graph.childNodes(way);
-                   for (var i = 0; i < nodes.length - 1; i++) {
-                       var node1 = nodes[i];
-                       var node2 = nodes[i+1];
+         var events = [];
+         var leftCoincide = false;
+         var rightCoincide = false;
 
-                       var issue = getWayIssueIfAny(node1, node2, way);
-                       if (issue) issues.push(issue);
-                   }
-                   return issues;
-               }
+         if (equals(se1.point, se2.point)) {
+           leftCoincide = true; // linked
+         } else if (compareEvents(se1, se2) === 1) {
+           events.push(se2, se1);
+         } else {
+           events.push(se1, se2);
+         }
 
-               function getIssuesForVertex(node, parentWays) {
-                   var issues = [];
+         if (equals(se1.otherEvent.point, se2.otherEvent.point)) {
+           rightCoincide = true;
+         } else if (compareEvents(se1.otherEvent, se2.otherEvent) === 1) {
+           events.push(se2.otherEvent, se1.otherEvent);
+         } else {
+           events.push(se1.otherEvent, se2.otherEvent);
+         }
 
-                   function checkForCloseness(node1, node2, way) {
-                       var issue = getWayIssueIfAny(node1, node2, way);
-                       if (issue) issues.push(issue);
-                   }
+         if (leftCoincide && rightCoincide || leftCoincide) {
+           // both line segments are equal or share the left endpoint
+           se2.type = NON_CONTRIBUTING;
+           se1.type = se2.inOut === se1.inOut ? SAME_TRANSITION : DIFFERENT_TRANSITION;
 
-                   for (var i = 0; i < parentWays.length; i++) {
-                       var parentWay = parentWays[i];
+           if (leftCoincide && !rightCoincide) {
+             // honestly no idea, but changing events selection from [2, 1]
+             // to [0, 1] fixes the overlapping self-intersecting polygons issue
+             divideSegment(events[1].otherEvent, events[0].point, queue);
+           }
 
-                       if (!shouldCheckWay(parentWay)) continue;
+           return 2;
+         } // the line segments share the right endpoint
 
-                       var lastIndex = parentWay.nodes.length - 1;
-                       for (var j = 0; j < parentWay.nodes.length; j++) {
-                           if (j !== 0) {
-                               if (parentWay.nodes[j-1] === node.id) {
-                                   checkForCloseness(node, graph.entity(parentWay.nodes[j]), parentWay);
-                               }
-                           }
-                           if (j !== lastIndex) {
-                               if (parentWay.nodes[j+1] === node.id) {
-                                   checkForCloseness(graph.entity(parentWay.nodes[j]), node, parentWay);
-                               }
-                           }
-                       }
-                   }
-                   return issues;
-               }
 
-               function thresholdMetersForWay(way) {
-                   if (!shouldCheckWay(way)) return 0;
+         if (rightCoincide) {
+           divideSegment(events[0], events[1].point, queue);
+           return 3;
+         } // no line segment includes totally the other one
 
-                   var wayType = wayTypeFor(way);
 
-                   // don't flag boundaries since they might be highly detailed and can't be easily verified
-                   if (wayType === 'boundary') return 0;
-                   // expect some features to be mapped with higher levels of detail
-                   if (wayType === 'indoor') return 0.01;
-                   if (wayType === 'building') return 0.05;
-                   if (wayType === 'path') return 0.1;
-                   return 0.2;
-               }
+         if (events[0] !== events[3].otherEvent) {
+           divideSegment(events[0], events[1].point, queue);
+           divideSegment(events[1], events[2].point, queue);
+           return 3;
+         } // one line segment includes the other one
 
-               function getIssuesForDetachedPoint(node) {
 
-                   var issues = [];
+         divideSegment(events[0], events[1].point, queue);
+         divideSegment(events[3].otherEvent, events[2].point, queue);
+         return 3;
+       }
 
-                   var lon = node.loc[0];
-                   var lat = node.loc[1];
-                   var lon_range = geoMetersToLon(pointThresholdMeters, lat) / 2;
-                   var lat_range = geoMetersToLat(pointThresholdMeters) / 2;
-                   var queryExtent = geoExtent([
-                       [lon - lon_range, lat - lat_range],
-                       [lon + lon_range, lat + lat_range]
-                   ]);
+       /**
+        * @param  {SweepEvent} le1
+        * @param  {SweepEvent} le2
+        * @return {Number}
+        */
 
-                   var intersected = context.history().tree().intersects(queryExtent, graph);
-                   for (var j = 0; j < intersected.length; j++) {
-                       var nearby = intersected[j];
+       function compareSegments(le1, le2) {
+         if (le1 === le2) return 0; // Segments are not collinear
 
-                       if (nearby.id === node.id) continue;
-                       if (nearby.type !== 'node' || nearby.geometry(graph) !== 'point') continue;
+         if (signedArea(le1.point, le1.otherEvent.point, le2.point) !== 0 || signedArea(le1.point, le1.otherEvent.point, le2.otherEvent.point) !== 0) {
+           // If they share their left endpoint use the right endpoint to sort
+           if (equals(le1.point, le2.point)) return le1.isBelow(le2.otherEvent.point) ? -1 : 1; // Different left endpoint: use the left endpoint to sort
 
-                       if (nearby.loc === node.loc ||
-                           geoSphericalDistance(node.loc, nearby.loc) < pointThresholdMeters) {
+           if (le1.point[0] === le2.point[0]) return le1.point[1] < le2.point[1] ? -1 : 1; // has the line segment associated to e1 been inserted
+           // into S after the line segment associated to e2 ?
 
-                           // allow very close points if tags indicate the z-axis might vary
-                           var zAxisKeys = { layer: true, level: true, 'addr:housenumber': true, 'addr:unit': true };
-                           var zAxisDifferentiates = false;
-                           for (var key in zAxisKeys) {
-                               var nodeValue = node.tags[key] || '0';
-                               var nearbyValue = nearby.tags[key] || '0';
-                               if (nodeValue !== nearbyValue) {
-                                   zAxisDifferentiates = true;
-                                   break;
-                               }
-                           }
-                           if (zAxisDifferentiates) continue;
-
-                           issues.push(new validationIssue({
-                               type: type,
-                               subtype: 'detached',
-                               severity: 'warning',
-                               message: function(context) {
-                                   var entity = context.hasEntity(this.entityIds[0]),
-                                       entity2 = context.hasEntity(this.entityIds[1]);
-                                   return (entity && entity2) ? _t('issues.close_nodes.detached.message', {
-                                       feature: utilDisplayLabel(entity, context.graph()),
-                                       feature2: utilDisplayLabel(entity2, context.graph())
-                                   }) : '';
-                               },
-                               reference: showReference,
-                               entityIds: [node.id, nearby.id],
-                               dynamicFixes: function() {
-                                   return [
-                                       new validationIssueFix({
-                                           icon: 'iD-operation-disconnect',
-                                           title: _t('issues.fix.move_points_apart.title')
-                                       }),
-                                       new validationIssueFix({
-                                           icon: 'iD-icon-layers',
-                                           title: _t('issues.fix.use_different_layers_or_levels.title')
-                                       })
-                                   ];
-                               }
-                           }));
-                       }
-                   }
+           if (compareEvents(le1, le2) === 1) return le2.isAbove(le1.point) ? -1 : 1; // The line segment associated to e2 has been inserted
+           // into S after the line segment associated to e1
 
-                   return issues;
+           return le1.isBelow(le2.point) ? -1 : 1;
+         }
 
-                   function showReference(selection) {
-                       var referenceText = _t('issues.close_nodes.detached.reference');
-                       selection.selectAll('.issue-reference')
-                           .data([0])
-                           .enter()
-                           .append('div')
-                           .attr('class', 'issue-reference')
-                           .text(referenceText);
-                   }
-               }
+         if (le1.isSubject === le2.isSubject) {
+           // same polygon
+           var p1 = le1.point,
+               p2 = le2.point;
 
-               function getWayIssueIfAny(node1, node2, way) {
-                   if (node1.id === node2.id ||
-                       (node1.hasInterestingTags() && node2.hasInterestingTags())) {
-                       return null;
-                   }
+           if (p1[0] === p2[0] && p1[1] === p2[1]
+           /*equals(le1.point, le2.point)*/
+           ) {
+               p1 = le1.otherEvent.point;
+               p2 = le2.otherEvent.point;
+               if (p1[0] === p2[0] && p1[1] === p2[1]) return 0;else return le1.contourId > le2.contourId ? 1 : -1;
+             }
+         } else {
+           // Segments are collinear, but belong to separate polygons
+           return le1.isSubject ? -1 : 1;
+         }
 
-                   if (node1.loc !== node2.loc) {
-                       var parentWays1 = graph.parentWays(node1);
-                       var parentWays2 = new Set(graph.parentWays(node2));
+         return compareEvents(le1, le2) === 1 ? 1 : -1;
+       }
 
-                       var sharedWays = parentWays1.filter(function(parentWay) {
-                           return parentWays2.has(parentWay);
-                       });
+       function subdivide(eventQueue, subject, clipping, sbbox, cbbox, operation) {
+         var sweepLine = new SplayTree(compareSegments);
+         var sortedEvents = [];
+         var rightbound = Math.min(sbbox[2], cbbox[2]);
+         var prev, next, begin;
 
-                       var thresholds = sharedWays.map(function(parentWay) {
-                           return thresholdMetersForWay(parentWay);
-                       });
+         while (eventQueue.length !== 0) {
+           var event = eventQueue.pop();
+           sortedEvents.push(event); // optimization by bboxes for intersection and difference goes here
 
-                       var threshold = Math.min(...thresholds);
-                       var distance = geoSphericalDistance(node1.loc, node2.loc);
-                       if (distance > threshold) return null;
-                   }
+           if (operation === INTERSECTION && event.point[0] > rightbound || operation === DIFFERENCE && event.point[0] > sbbox[2]) {
+             break;
+           }
 
-                   return new validationIssue({
-                       type: type,
-                       subtype: 'vertices',
-                       severity: 'warning',
-                       message: function(context) {
-                           var entity = context.hasEntity(this.entityIds[0]);
-                           return entity ? _t('issues.close_nodes.message', { way: utilDisplayLabel(entity, context.graph()) }) : '';
-                       },
-                       reference: showReference,
-                       entityIds: [way.id, node1.id, node2.id],
-                       loc: node1.loc,
-                       dynamicFixes: function() {
-                           return [
-                               new validationIssueFix({
-                                   icon: 'iD-icon-plus',
-                                   title: _t('issues.fix.merge_points.title'),
-                                   onClick: function(context) {
-                                       var entityIds = this.issue.entityIds;
-                                       var action = actionMergeNodes([entityIds[1], entityIds[2]]);
-                                       context.perform(action, _t('issues.fix.merge_close_vertices.annotation'));
-                                   }
-                               }),
-                               new validationIssueFix({
-                                   icon: 'iD-operation-disconnect',
-                                   title: _t('issues.fix.move_points_apart.title')
-                               })
-                           ];
-                       }
-                   });
+           if (event.left) {
+             next = prev = sweepLine.insert(event);
+             begin = sweepLine.minNode();
+             if (prev !== begin) prev = sweepLine.prev(prev);else prev = null;
+             next = sweepLine.next(next);
+             var prevEvent = prev ? prev.key : null;
+             var prevprevEvent = void 0;
+             computeFields(event, prevEvent, operation);
 
-                   function showReference(selection) {
-                       var referenceText = _t('issues.close_nodes.reference');
-                       selection.selectAll('.issue-reference')
-                           .data([0])
-                           .enter()
-                           .append('div')
-                           .attr('class', 'issue-reference')
-                           .text(referenceText);
-                   }
+             if (next) {
+               if (possibleIntersection(event, next.key, eventQueue) === 2) {
+                 computeFields(event, prevEvent, operation);
+                 computeFields(event, next.key, operation);
                }
+             }
 
-           };
-
-
-           validation.type = type;
-
-           return validation;
-       }
-
-       function validationCrossingWays(context) {
-           var type = 'crossing_ways';
-
-           // returns the way or its parent relation, whichever has a useful feature type
-           function getFeatureWithFeatureTypeTagsForWay(way, graph) {
-               if (getFeatureType(way, graph) === null) {
-                   // if the way doesn't match a feature type, check its parent relations
-                   var parentRels = graph.parentRelations(way);
-                   for (var i = 0; i < parentRels.length; i++) {
-                       var rel = parentRels[i];
-                       if (getFeatureType(rel, graph) !== null) {
-                           return rel;
-                       }
-                   }
+             if (prev) {
+               if (possibleIntersection(prev.key, event, eventQueue) === 2) {
+                 var prevprev = prev;
+                 if (prevprev !== begin) prevprev = sweepLine.prev(prevprev);else prevprev = null;
+                 prevprevEvent = prevprev ? prevprev.key : null;
+                 computeFields(prevEvent, prevprevEvent, operation);
+                 computeFields(event, prevEvent, operation);
                }
-               return way;
-           }
+             }
+           } else {
+             event = event.otherEvent;
+             next = prev = sweepLine.find(event);
 
+             if (prev && next) {
+               if (prev !== begin) prev = sweepLine.prev(prev);else prev = null;
+               next = sweepLine.next(next);
+               sweepLine.remove(event);
 
-           function hasTag(tags, key) {
-               return tags[key] !== undefined && tags[key] !== 'no';
+               if (next && prev) {
+                 possibleIntersection(prev.key, next.key, eventQueue);
+               }
+             }
            }
+         }
 
-           function taggedAsIndoor(tags) {
-               return hasTag(tags, 'indoor') ||
-                   hasTag(tags, 'level') ||
-                   tags.highway === 'corridor';
-           }
+         return sortedEvents;
+       }
 
-           function allowsBridge(featureType) {
-               return featureType === 'highway' || featureType === 'railway' || featureType === 'waterway';
-           }
-           function allowsTunnel(featureType) {
-               return featureType === 'highway' || featureType === 'railway' || featureType === 'waterway';
-           }
+       var Contour = /*#__PURE__*/function () {
+         /**
+          * Contour
+          *
+          * @class {Contour}
+          */
+         function Contour() {
+           _classCallCheck(this, Contour);
 
+           this.points = [];
+           this.holeIds = [];
+           this.holeOf = null;
+           this.depth = null;
+         }
 
-           function getFeatureTypeForCrossingCheck(way, graph) {
-               var feature = getFeatureWithFeatureTypeTagsForWay(way, graph);
-               return getFeatureType(feature, graph);
+         _createClass(Contour, [{
+           key: "isExterior",
+           value: function isExterior() {
+             return this.holeOf == null;
            }
+         }]);
 
-           // discard
-           var ignoredBuildings = {
-               demolished: true, dismantled: true, proposed: true, razed: true
-           };
+         return Contour;
+       }();
 
+       /**
+        * @param  {Array.<SweepEvent>} sortedEvents
+        * @return {Array.<SweepEvent>}
+        */
 
-           function getFeatureType(entity, graph) {
+       function orderEvents(sortedEvents) {
+         var event, i, len, tmp;
+         var resultEvents = [];
 
-               var geometry = entity.geometry(graph);
-               if (geometry !== 'line' && geometry !== 'area') return null;
+         for (i = 0, len = sortedEvents.length; i < len; i++) {
+           event = sortedEvents[i];
 
-               var tags = entity.tags;
+           if (event.left && event.inResult || !event.left && event.otherEvent.inResult) {
+             resultEvents.push(event);
+           }
+         } // Due to overlapping edges the resultEvents array can be not wholly sorted
 
-               if (hasTag(tags, 'building') && !ignoredBuildings[tags.building]) return 'building';
-               if (hasTag(tags, 'highway') && osmRoutableHighwayTagValues[tags.highway]) return 'highway';
 
-               // don't check railway or waterway areas
-               if (geometry !== 'line') return null;
+         var sorted = false;
 
-               if (hasTag(tags, 'railway') && osmRailwayTrackTagValues[tags.railway]) return 'railway';
-               if (hasTag(tags, 'waterway') && osmFlowingWaterwayTagValues[tags.waterway]) return 'waterway';
+         while (!sorted) {
+           sorted = true;
 
-               return null;
+           for (i = 0, len = resultEvents.length; i < len; i++) {
+             if (i + 1 < len && compareEvents(resultEvents[i], resultEvents[i + 1]) === 1) {
+               tmp = resultEvents[i];
+               resultEvents[i] = resultEvents[i + 1];
+               resultEvents[i + 1] = tmp;
+               sorted = false;
+             }
            }
+         }
 
+         for (i = 0, len = resultEvents.length; i < len; i++) {
+           event = resultEvents[i];
+           event.otherPos = i;
+         } // imagine, the right event is found in the beginning of the queue,
+         // when his left counterpart is not marked yet
 
-           function isLegitCrossing(way1, featureType1, way2, featureType2) {
-               var tags1 = way1.tags;
-               var tags2 = way2.tags;
-
-               // assume 0 by default
-               var level1 = tags1.level || '0';
-               var level2 = tags2.level || '0';
 
-               if (taggedAsIndoor(tags1) && taggedAsIndoor(tags2) && level1 !== level2) {
-                   // assume features don't interact if they're indoor on different levels
-                   return true;
-               }
+         for (i = 0, len = resultEvents.length; i < len; i++) {
+           event = resultEvents[i];
 
-               // assume 0 by default; don't use way.layer() since we account for structures here
-               var layer1 = tags1.layer || '0';
-               var layer2 = tags2.layer || '0';
+           if (!event.left) {
+             tmp = event.otherPos;
+             event.otherPos = event.otherEvent.otherPos;
+             event.otherEvent.otherPos = tmp;
+           }
+         }
 
-               if (allowsBridge(featureType1) && allowsBridge(featureType2)) {
-                   if (hasTag(tags1, 'bridge') && !hasTag(tags2, 'bridge')) return true;
-                   if (!hasTag(tags1, 'bridge') && hasTag(tags2, 'bridge')) return true;
-                   // crossing bridges must use different layers
-                   if (hasTag(tags1, 'bridge') && hasTag(tags2, 'bridge') && layer1 !== layer2) return true;
-               } else if (allowsBridge(featureType1) && hasTag(tags1, 'bridge')) return true;
-               else if (allowsBridge(featureType2) && hasTag(tags2, 'bridge')) return true;
+         return resultEvents;
+       }
+       /**
+        * @param  {Number} pos
+        * @param  {Array.<SweepEvent>} resultEvents
+        * @param  {Object>}    processed
+        * @return {Number}
+        */
 
-               if (allowsTunnel(featureType1) && allowsTunnel(featureType2)) {
-                   if (hasTag(tags1, 'tunnel') && !hasTag(tags2, 'tunnel')) return true;
-                   if (!hasTag(tags1, 'tunnel') && hasTag(tags2, 'tunnel')) return true;
-                   // crossing tunnels must use different layers
-                   if (hasTag(tags1, 'tunnel') && hasTag(tags2, 'tunnel') && layer1 !== layer2) return true;
-               } else if (allowsTunnel(featureType1) && hasTag(tags1, 'tunnel')) return true;
-               else if (allowsTunnel(featureType2) && hasTag(tags2, 'tunnel')) return true;
 
-               // don't flag crossing waterways and pier/highways
-               if (featureType1 === 'waterway' && featureType2 === 'highway' && tags2.man_made === 'pier') return true;
-               if (featureType2 === 'waterway' && featureType1 === 'highway' && tags1.man_made === 'pier') return true;
+       function nextPos(pos, resultEvents, processed, origPos) {
+         var newPos = pos + 1,
+             p = resultEvents[pos].point,
+             p1;
+         var length = resultEvents.length;
+         if (newPos < length) p1 = resultEvents[newPos].point;
 
-               if (featureType1 === 'building' || featureType2 === 'building') {
-                   // for building crossings, different layers are enough
-                   if (layer1 !== layer2) return true;
-               }
-               return false;
+         while (newPos < length && p1[0] === p[0] && p1[1] === p[1]) {
+           if (!processed[newPos]) {
+             return newPos;
+           } else {
+             newPos++;
            }
 
+           p1 = resultEvents[newPos].point;
+         }
 
-           // highway values for which we shouldn't recommend connecting to waterways
-           var highwaysDisallowingFords = {
-               motorway: true, motorway_link: true, trunk: true, trunk_link: true,
-               primary: true, primary_link: true, secondary: true, secondary_link: true
-           };
-           var nonCrossingHighways = { track: true };
-
-           function tagsForConnectionNodeIfAllowed(entity1, entity2, graph) {
-               var featureType1 = getFeatureType(entity1, graph);
-               var featureType2 = getFeatureType(entity2, graph);
-
-               var geometry1 = entity1.geometry(graph);
-               var geometry2 = entity2.geometry(graph);
-               var bothLines = geometry1 === 'line' && geometry2 === 'line';
-
-               if (featureType1 === featureType2) {
-                   if (featureType1 === 'highway') {
-                       var entity1IsPath = osmPathHighwayTagValues[entity1.tags.highway];
-                       var entity2IsPath = osmPathHighwayTagValues[entity2.tags.highway];
-                       if ((entity1IsPath || entity2IsPath) && entity1IsPath !== entity2IsPath) {
-                           // one feature is a path but not both
-
-                           var roadFeature = entity1IsPath ? entity2 : entity1;
-                           if (nonCrossingHighways[roadFeature.tags.highway]) {
-                               // don't mark path connections with certain roads as crossings
-                               return {};
-                           }
-                           var pathFeature = entity1IsPath ? entity1 : entity2;
-                           if (['marked', 'unmarked'].indexOf(pathFeature.tags.crossing) !== -1) {
-                               // if the path is a crossing, match the crossing type
-                               return bothLines ? { highway: 'crossing', crossing: pathFeature.tags.crossing } : {};
-                           }
-                           // don't add a `crossing` subtag to ambiguous crossings
-                           return bothLines ? { highway: 'crossing' } : {};
-                       }
-                       return {};
-                   }
-                   if (featureType1 === 'waterway') return {};
-                   if (featureType1 === 'railway') return {};
+         newPos = pos - 1;
 
-               } else {
-                   var featureTypes = [featureType1, featureType2];
-                   if (featureTypes.indexOf('highway') !== -1) {
-                       if (featureTypes.indexOf('railway') !== -1) {
-                           if (osmPathHighwayTagValues[entity1.tags.highway] ||
-                               osmPathHighwayTagValues[entity2.tags.highway]) {
-                               // path-rail connections use this tag
-                               return bothLines ? { railway: 'crossing' } : {};
-                           } else {
-                               // road-rail connections use this tag
-                               return bothLines ? { railway: 'level_crossing' } : {};
-                           }
-                       }
+         while (processed[newPos] && newPos > origPos) {
+           newPos--;
+         }
 
-                       if (featureTypes.indexOf('waterway') !== -1) {
-                           // do not allow fords on structures
-                           if (hasTag(entity1.tags, 'tunnel') && hasTag(entity2.tags, 'tunnel')) return null;
-                           if (hasTag(entity1.tags, 'bridge') && hasTag(entity2.tags, 'bridge')) return null;
+         return newPos;
+       }
 
-                           if (highwaysDisallowingFords[entity1.tags.highway] ||
-                               highwaysDisallowingFords[entity2.tags.highway]) {
-                               // do not allow fords on major highways
-                               return null;
-                           }
-                           return bothLines ? { ford: 'yes' } : {};
-                       }
-                   }
-               }
-               return null;
-           }
+       function initializeContourFromContext(event, contours, contourId) {
+         var contour = new Contour();
 
+         if (event.prevInResult != null) {
+           var prevInResult = event.prevInResult; // Note that it is valid to query the "previous in result" for its output contour id,
+           // because we must have already processed it (i.e., assigned an output contour id)
+           // in an earlier iteration, otherwise it wouldn't be possible that it is "previous in
+           // result".
 
-           function findCrossingsByWay(way1, graph, tree) {
-               var edgeCrossInfos = [];
-               if (way1.type !== 'way') return edgeCrossInfos;
-
-               var way1FeatureType = getFeatureTypeForCrossingCheck(way1, graph);
-               if (way1FeatureType === null) return edgeCrossInfos;
-
-               var checkedSingleCrossingWays = {};
-
-               // declare vars ahead of time to reduce garbage collection
-               var i, j;
-               var extent;
-               var n1, n2, nA, nB, nAId, nBId;
-               var segment1, segment2;
-               var oneOnly;
-               var segmentInfos, segment2Info, way2, way2FeatureType;
-               var way1Nodes = graph.childNodes(way1);
-               var comparedWays = {};
-               for (i = 0; i < way1Nodes.length - 1; i++) {
-                   n1 = way1Nodes[i];
-                   n2 = way1Nodes[i + 1];
-                   extent = geoExtent([
-                       [
-                           Math.min(n1.loc[0], n2.loc[0]),
-                           Math.min(n1.loc[1], n2.loc[1])
-                       ],
-                       [
-                           Math.max(n1.loc[0], n2.loc[0]),
-                           Math.max(n1.loc[1], n2.loc[1])
-                       ]
-                   ]);
-
-                   // Optimize by only checking overlapping segments, not every segment
-                   // of overlapping ways
-                   segmentInfos = tree.waySegments(extent, graph);
-
-                   for (j = 0; j < segmentInfos.length; j++) {
-                       segment2Info = segmentInfos[j];
-
-                       // don't check for self-intersection in this validation
-                       if (segment2Info.wayId === way1.id) continue;
-
-                       // skip if this way was already checked and only one issue is needed
-                       if (checkedSingleCrossingWays[segment2Info.wayId]) continue;
-
-                       // mark this way as checked even if there are no crossings
-                       comparedWays[segment2Info.wayId] = true;
-
-                       way2 = graph.hasEntity(segment2Info.wayId);
-                       if (!way2) continue;
-
-                       // only check crossing highway, waterway, building, and railway
-                       way2FeatureType = getFeatureTypeForCrossingCheck(way2, graph);
-                       if (way2FeatureType === null ||
-                           isLegitCrossing(way1, way1FeatureType, way2, way2FeatureType)) {
-                           continue;
-                       }
+           var lowerContourId = prevInResult.outputContourId;
+           var lowerResultTransition = prevInResult.resultTransition;
 
-                       // create only one issue for building crossings
-                       oneOnly = way1FeatureType === 'building' || way2FeatureType === 'building';
+           if (lowerResultTransition > 0) {
+             // We are inside. Now we have to check if the thing below us is another hole or
+             // an exterior contour.
+             var lowerContour = contours[lowerContourId];
 
-                       nAId = segment2Info.nodes[0];
-                       nBId = segment2Info.nodes[1];
-                       if (nAId === n1.id || nAId === n2.id ||
-                           nBId === n1.id || nBId === n2.id) {
-                           // n1 or n2 is a connection node; skip
-                           continue;
-                       }
-                       nA = graph.hasEntity(nAId);
-                       if (!nA) continue;
-                       nB = graph.hasEntity(nBId);
-                       if (!nB) continue;
-
-                       segment1 = [n1.loc, n2.loc];
-                       segment2 = [nA.loc, nB.loc];
-                       var point = geoLineIntersection(segment1, segment2);
-                       if (point) {
-                           edgeCrossInfos.push({
-                               wayInfos: [
-                                   {
-                                       way: way1,
-                                       featureType: way1FeatureType,
-                                       edge: [n1.id, n2.id]
-                                   },
-                                   {
-                                       way: way2,
-                                       featureType: way2FeatureType,
-                                       edge: [nA.id, nB.id]
-                                   }
-                               ],
-                               crossPoint: point
-                           });
-                           if (oneOnly) {
-                               checkedSingleCrossingWays[way2.id] = true;
-                               break;
-                           }
-                       }
-                   }
-               }
-               return edgeCrossInfos;
+             if (lowerContour.holeOf != null) {
+               // The lower contour is a hole => Connect the new contour as a hole to its parent,
+               // and use same depth.
+               var parentContourId = lowerContour.holeOf;
+               contours[parentContourId].holeIds.push(contourId);
+               contour.holeOf = parentContourId;
+               contour.depth = contours[lowerContourId].depth;
+             } else {
+               // The lower contour is an exterior contour => Connect the new contour as a hole,
+               // and increment depth.
+               contours[lowerContourId].holeIds.push(contourId);
+               contour.holeOf = lowerContourId;
+               contour.depth = contours[lowerContourId].depth + 1;
+             }
+           } else {
+             // We are outside => this contour is an exterior contour of same depth.
+             contour.holeOf = null;
+             contour.depth = contours[lowerContourId].depth;
            }
+         } else {
+           // There is no lower/previous contour => this contour is an exterior contour of depth 0.
+           contour.holeOf = null;
+           contour.depth = 0;
+         }
 
+         return contour;
+       }
+       /**
+        * @param  {Array.<SweepEvent>} sortedEvents
+        * @return {Array.<*>} polygons
+        */
 
-           function waysToCheck(entity, graph) {
-               var featureType = getFeatureType(entity, graph);
-               if (!featureType) return [];
-
-               if (entity.type === 'way') {
-                   return [entity];
-               } else if (entity.type === 'relation') {
-                   return entity.members.reduce(function(array, member) {
-                       if (member.type === 'way' &&
-                           // only look at geometry ways
-                           (!member.role || member.role === 'outer' || member.role === 'inner')) {
-                           var entity = graph.hasEntity(member.id);
-                           // don't add duplicates
-                           if (entity && array.indexOf(entity) === -1) {
-                               array.push(entity);
-                           }
-                       }
-                       return array;
-                   }, []);
-               }
-               return [];
-           }
 
+       function connectEdges(sortedEvents) {
+         var i, len;
+         var resultEvents = orderEvents(sortedEvents); // "false"-filled array
 
-           var validation = function checkCrossingWays(entity, graph) {
+         var processed = {};
+         var contours = [];
 
-               var tree = context.history().tree();
+         var _loop = function _loop() {
+           if (processed[i]) {
+             return "continue";
+           }
 
-               var ways = waysToCheck(entity, graph);
+           var contourId = contours.length;
+           var contour = initializeContourFromContext(resultEvents[i], contours, contourId); // Helper function that combines marking an event as processed with assigning its output contour ID
 
-               var issues = [];
-               // declare these here to reduce garbage collection
-               var wayIndex, crossingIndex, crossings;
-               for (wayIndex in ways) {
-                   crossings = findCrossingsByWay(ways[wayIndex], graph, tree);
-                   for (crossingIndex in crossings) {
-                       issues.push(createIssue(crossings[crossingIndex], graph));
-                   }
-               }
-               return issues;
+           var markAsProcessed = function markAsProcessed(pos) {
+             processed[pos] = true;
+             resultEvents[pos].outputContourId = contourId;
            };
 
+           var pos = i;
+           var origPos = i;
+           var initial = resultEvents[i].point;
+           contour.points.push(initial);
+           /* eslint no-constant-condition: "off" */
 
-           function createIssue(crossing, graph) {
+           while (true) {
+             markAsProcessed(pos);
+             pos = resultEvents[pos].otherPos;
+             markAsProcessed(pos);
+             contour.points.push(resultEvents[pos].point);
+             pos = nextPos(pos, resultEvents, processed, origPos);
 
-               // use the entities with the tags that define the feature type
-               crossing.wayInfos.sort(function(way1Info, way2Info) {
-                   var type1 = way1Info.featureType;
-                   var type2 = way2Info.featureType;
-                   if (type1 === type2) {
-                       return utilDisplayLabel(way1Info.way, graph) > utilDisplayLabel(way2Info.way, graph);
-                   } else if (type1 === 'waterway') {
-                       return true;
-                   } else if (type2 === 'waterway') {
-                       return false;
-                   }
-                   return type1 < type2;
-               });
-               var entities = crossing.wayInfos.map(function(wayInfo) {
-                   return getFeatureWithFeatureTypeTagsForWay(wayInfo.way, graph);
-               });
-               var edges = [crossing.wayInfos[0].edge, crossing.wayInfos[1].edge];
-               var featureTypes = [crossing.wayInfos[0].featureType, crossing.wayInfos[1].featureType];
+             if (pos == origPos) {
+               break;
+             }
+           }
 
-               var connectionTags = tagsForConnectionNodeIfAllowed(entities[0], entities[1], graph);
+           contours.push(contour);
+         };
 
-               var featureType1 = crossing.wayInfos[0].featureType;
-               var featureType2 = crossing.wayInfos[1].featureType;
+         for (i = 0, len = resultEvents.length; i < len; i++) {
+           var _ret = _loop();
 
-               var isCrossingIndoors = taggedAsIndoor(entities[0].tags) && taggedAsIndoor(entities[1].tags);
-               var isCrossingTunnels = allowsTunnel(featureType1) && hasTag(entities[0].tags, 'tunnel') &&
-                                       allowsTunnel(featureType2) && hasTag(entities[1].tags, 'tunnel');
-               var isCrossingBridges = allowsBridge(featureType1) && hasTag(entities[0].tags, 'bridge') &&
-                                       allowsBridge(featureType2) && hasTag(entities[1].tags, 'bridge');
+           if (_ret === "continue") continue;
+         }
 
-               var subtype = [featureType1, featureType2].sort().join('-');
+         return contours;
+       }
 
-               var crossingTypeID = subtype;
+       var tinyqueue = TinyQueue;
+       var _default$1 = TinyQueue;
 
-               if (isCrossingIndoors) {
-                   crossingTypeID = 'indoor-indoor';
-               } else if (isCrossingTunnels) {
-                   crossingTypeID = 'tunnel-tunnel';
-               } else if (isCrossingBridges) {
-                   crossingTypeID = 'bridge-bridge';
-               }
-               if (connectionTags && (isCrossingIndoors || isCrossingTunnels || isCrossingBridges)) {
-                   crossingTypeID += '_connectable';
-               }
+       function TinyQueue(data, compare) {
+         if (!(this instanceof TinyQueue)) return new TinyQueue(data, compare);
+         this.data = data || [];
+         this.length = this.data.length;
+         this.compare = compare || defaultCompare$1;
 
-               return new validationIssue({
-                   type: type,
-                   subtype: subtype,
-                   severity: 'warning',
-                   message: function(context) {
-                       var graph = context.graph();
-                       var entity1 = graph.hasEntity(this.entityIds[0]),
-                           entity2 = graph.hasEntity(this.entityIds[1]);
-                       return (entity1 && entity2) ? _t('issues.crossing_ways.message', {
-                           feature: utilDisplayLabel(entity1, graph),
-                           feature2: utilDisplayLabel(entity2, graph)
-                       }) : '';
-                   },
-                   reference: showReference,
-                   entityIds: entities.map(function(entity) {
-                       return entity.id;
-                   }),
-                   data: {
-                       edges: edges,
-                       featureTypes: featureTypes,
-                       connectionTags: connectionTags
-                   },
-                   // differentiate based on the loc since two ways can cross multiple times
-                   hash: crossing.crossPoint.toString() +
-                       // if the edges change then so does the fix
-                       edges.slice().sort(function(edge1, edge2) {
-                           // order to assure hash is deterministic
-                           return edge1[0] < edge2[0] ? -1 : 1;
-                       }).toString() +
-                       // ensure the correct connection tags are added in the fix
-                       JSON.stringify(connectionTags),
-                   loc: crossing.crossPoint,
-                   dynamicFixes: function(context) {
-                       var mode = context.mode();
-                       if (!mode || mode.id !== 'select' || mode.selectedIDs().length !== 1) return [];
-
-                       var selectedIndex = this.entityIds[0] === mode.selectedIDs()[0] ? 0 : 1;
-                       var selectedFeatureType = this.data.featureTypes[selectedIndex];
-                       var otherFeatureType = this.data.featureTypes[selectedIndex === 0 ? 1 : 0];
-
-                       var fixes = [];
-
-                       if (connectionTags) {
-                           fixes.push(makeConnectWaysFix(this.data.connectionTags));
-                       }
+         if (this.length > 0) {
+           for (var i = (this.length >> 1) - 1; i >= 0; i--) {
+             this._down(i);
+           }
+         }
+       }
 
-                       if (isCrossingIndoors) {
-                           fixes.push(new validationIssueFix({
-                               icon: 'iD-icon-layers',
-                               title: _t('issues.fix.use_different_levels.title')
-                           }));
-                       } else if (isCrossingTunnels ||
-                           isCrossingBridges ||
-                           featureType1 === 'building' ||
-                           featureType2 === 'building')  {
-
-                           fixes.push(makeChangeLayerFix('higher'));
-                           fixes.push(makeChangeLayerFix('lower'));
-
-                       // can only add bridge/tunnel if both features are lines
-                       } else if (context.graph().geometry(this.entityIds[0]) === 'line' &&
-                           context.graph().geometry(this.entityIds[1]) === 'line') {
-
-                           // don't recommend adding bridges to waterways since they're uncommmon
-                           if (allowsBridge(selectedFeatureType) && selectedFeatureType !== 'waterway') {
-                               fixes.push(makeAddBridgeOrTunnelFix('add_a_bridge', 'temaki-bridge', 'bridge'));
-                           }
+       function defaultCompare$1(a, b) {
+         return a < b ? -1 : a > b ? 1 : 0;
+       }
 
-                           // don't recommend adding tunnels under waterways since they're uncommmon
-                           var skipTunnelFix = otherFeatureType === 'waterway' && selectedFeatureType !== 'waterway';
-                           if (allowsTunnel(selectedFeatureType) && !skipTunnelFix) {
-                               fixes.push(makeAddBridgeOrTunnelFix('add_a_tunnel', 'temaki-tunnel', 'tunnel'));
-                           }
-                       }
+       TinyQueue.prototype = {
+         push: function push(item) {
+           this.data.push(item);
+           this.length++;
 
-                       // repositioning the features is always an option
-                       fixes.push(new validationIssueFix({
-                           icon: 'iD-operation-move',
-                           title: _t('issues.fix.reposition_features.title')
-                       }));
+           this._up(this.length - 1);
+         },
+         pop: function pop() {
+           if (this.length === 0) return undefined;
+           var top = this.data[0];
+           this.length--;
 
-                       return fixes;
-                   }
-               });
+           if (this.length > 0) {
+             this.data[0] = this.data[this.length];
 
-               function showReference(selection) {
-                   selection.selectAll('.issue-reference')
-                       .data([0])
-                       .enter()
-                       .append('div')
-                       .attr('class', 'issue-reference')
-                       .text(_t('issues.crossing_ways.' + crossingTypeID + '.reference'));
-               }
+             this._down(0);
            }
 
-           function makeAddBridgeOrTunnelFix(fixTitleID, iconName, bridgeOrTunnel){
-               return new validationIssueFix({
-                   icon: iconName,
-                   title: _t('issues.fix.' + fixTitleID + '.title'),
-                   onClick: function(context) {
-                       var mode = context.mode();
-                       if (!mode || mode.id !== 'select') return;
-
-                       var selectedIDs = mode.selectedIDs();
-                       if (selectedIDs.length !== 1) return;
-
-                       var selectedWayID = selectedIDs[0];
-                       if (!context.hasEntity(selectedWayID)) return;
-
-                       var resultWayIDs = [selectedWayID];
-
-                       var edge, crossedEdge, crossedWayID;
-                       if (this.issue.entityIds[0] === selectedWayID) {
-                           edge = this.issue.data.edges[0];
-                           crossedEdge = this.issue.data.edges[1];
-                           crossedWayID = this.issue.entityIds[1];
-                       } else {
-                           edge = this.issue.data.edges[1];
-                           crossedEdge = this.issue.data.edges[0];
-                           crossedWayID = this.issue.entityIds[0];
-                       }
+           this.data.pop();
+           return top;
+         },
+         peek: function peek() {
+           return this.data[0];
+         },
+         _up: function _up(pos) {
+           var data = this.data;
+           var compare = this.compare;
+           var item = data[pos];
 
-                       var crossingLoc = this.issue.loc;
+           while (pos > 0) {
+             var parent = pos - 1 >> 1;
+             var current = data[parent];
+             if (compare(item, current) >= 0) break;
+             data[pos] = current;
+             pos = parent;
+           }
 
-                       var projection = context.projection;
+           data[pos] = item;
+         },
+         _down: function _down(pos) {
+           var data = this.data;
+           var compare = this.compare;
+           var halfLength = this.length >> 1;
+           var item = data[pos];
 
-                       var action = function actionAddStructure(graph) {
+           while (pos < halfLength) {
+             var left = (pos << 1) + 1;
+             var right = left + 1;
+             var best = data[left];
 
-                           var edgeNodes = [graph.entity(edge[0]), graph.entity(edge[1])];
+             if (right < this.length && compare(data[right], best) < 0) {
+               left = right;
+               best = data[right];
+             }
 
-                           var crossedWay = graph.hasEntity(crossedWayID);
-                           // use the explicit width of the crossed feature as the structure length, if available
-                           var structLengthMeters = crossedWay && crossedWay.tags.width && parseFloat(crossedWay.tags.width);
-                           if (!structLengthMeters) {
-                               // if no explicit width is set, approximate the width based on the tags
-                               structLengthMeters = crossedWay && crossedWay.impliedLineWidthMeters();
-                           }
-                           if (structLengthMeters) {
-                               if (getFeatureType(crossedWay, graph) === 'railway') {
-                                   // bridges over railways are generally much longer than the rail bed itself, compensate
-                                   structLengthMeters *= 2;
-                               }
-                           } else {
-                               // should ideally never land here since all rail/water/road tags should have an implied width
-                               structLengthMeters = 8;
-                           }
+             if (compare(best, item) >= 0) break;
+             data[pos] = best;
+             pos = left;
+           }
 
-                           var a1 = geoAngle(edgeNodes[0], edgeNodes[1], projection) + Math.PI;
-                           var a2 = geoAngle(graph.entity(crossedEdge[0]), graph.entity(crossedEdge[1]), projection) + Math.PI;
-                           var crossingAngle = Math.max(a1, a2) - Math.min(a1, a2);
-                           if (crossingAngle > Math.PI) crossingAngle -= Math.PI;
-                           // lengthen the structure to account for the angle of the crossing
-                           structLengthMeters = ((structLengthMeters / 2) / Math.sin(crossingAngle)) * 2;
+           data[pos] = item;
+         }
+       };
+       tinyqueue["default"] = _default$1;
 
-                           // add padding since the structure must extend past the edges of the crossed feature
-                           structLengthMeters += 4;
+       var max$5 = Math.max;
+       var min$a = Math.min;
+       var contourId = 0;
 
-                           // clamp the length to a reasonable range
-                           structLengthMeters = Math.min(Math.max(structLengthMeters, 4), 50);
+       function processPolygon(contourOrHole, isSubject, depth, Q, bbox, isExteriorRing) {
+         var i, len, s1, s2, e1, e2;
 
-                           function geomToProj(geoPoint) {
-                               return [
-                                   geoLonToMeters(geoPoint[0], geoPoint[1]),
-                                   geoLatToMeters(geoPoint[1])
-                               ];
-                           }
-                           function projToGeom(projPoint) {
-                               var lat = geoMetersToLat(projPoint[1]);
-                               return [
-                                   geoMetersToLon(projPoint[0], lat),
-                                   lat
-                               ];
-                           }
+         for (i = 0, len = contourOrHole.length - 1; i < len; i++) {
+           s1 = contourOrHole[i];
+           s2 = contourOrHole[i + 1];
+           e1 = new SweepEvent(s1, false, undefined, isSubject);
+           e2 = new SweepEvent(s2, false, e1, isSubject);
+           e1.otherEvent = e2;
 
-                           var projEdgeNode1 = geomToProj(edgeNodes[0].loc);
-                           var projEdgeNode2 = geomToProj(edgeNodes[1].loc);
+           if (s1[0] === s2[0] && s1[1] === s2[1]) {
+             continue; // skip collapsed edges, or it breaks
+           }
 
-                           var projectedAngle = geoVecAngle(projEdgeNode1, projEdgeNode2);
+           e1.contourId = e2.contourId = depth;
 
-                           var projectedCrossingLoc = geomToProj(crossingLoc);
-                           var linearToSphericalMetersRatio = geoVecLength(projEdgeNode1, projEdgeNode2) /
-                               geoSphericalDistance(edgeNodes[0].loc, edgeNodes[1].loc);
+           if (!isExteriorRing) {
+             e1.isExteriorRing = false;
+             e2.isExteriorRing = false;
+           }
 
-                           function locSphericalDistanceFromCrossingLoc(angle, distanceMeters) {
-                               var lengthSphericalMeters = distanceMeters * linearToSphericalMetersRatio;
-                               return projToGeom([
-                                   projectedCrossingLoc[0] + Math.cos(angle) * lengthSphericalMeters,
-                                   projectedCrossingLoc[1] + Math.sin(angle) * lengthSphericalMeters
-                               ]);
-                           }
+           if (compareEvents(e1, e2) > 0) {
+             e2.left = true;
+           } else {
+             e1.left = true;
+           }
 
-                           var endpointLocGetter1 = function(lengthMeters) {
-                               return locSphericalDistanceFromCrossingLoc(projectedAngle, lengthMeters);
-                           };
-                           var endpointLocGetter2 = function(lengthMeters) {
-                               return locSphericalDistanceFromCrossingLoc(projectedAngle + Math.PI, lengthMeters);
-                           };
-
-                           // avoid creating very short edges from splitting too close to another node
-                           var minEdgeLengthMeters = 0.55;
-
-                           // decide where to bound the structure along the way, splitting as necessary
-                           function determineEndpoint(edge, endNode, locGetter) {
-                               var newNode;
-
-                               var idealLengthMeters = structLengthMeters / 2;
-
-                               // distance between the crossing location and the end of the edge,
-                               // the maximum length of this side of the structure
-                               var crossingToEdgeEndDistance = geoSphericalDistance(crossingLoc, endNode.loc);
-
-                               if (crossingToEdgeEndDistance - idealLengthMeters > minEdgeLengthMeters) {
-                                   // the edge is long enough to insert a new node
-
-                                   // the loc that would result in the full expected length
-                                   var idealNodeLoc = locGetter(idealLengthMeters);
-
-                                   newNode = osmNode();
-                                   graph = actionAddMidpoint({ loc: idealNodeLoc, edge: edge }, newNode)(graph);
-
-                               } else {
-                                   var edgeCount = 0;
-                                   endNode.parentIntersectionWays(graph).forEach(function(way) {
-                                       way.nodes.forEach(function(nodeID) {
-                                           if (nodeID === endNode.id) {
-                                               if ((endNode.id === way.first() && endNode.id !== way.last()) ||
-                                                   (endNode.id === way.last() && endNode.id !== way.first())) {
-                                                   edgeCount += 1;
-                                               } else {
-                                                   edgeCount += 2;
-                                               }
-                                           }
-                                       });
-                                   });
-
-                                   if (edgeCount >= 3) {
-                                       // the end node is a junction, try to leave a segment
-                                       // between it and the structure - #7202
-
-                                       var insetLength = crossingToEdgeEndDistance - minEdgeLengthMeters;
-                                       if (insetLength > minEdgeLengthMeters) {
-                                           var insetNodeLoc = locGetter(insetLength);
-                                           newNode = osmNode();
-                                           graph = actionAddMidpoint({ loc: insetNodeLoc, edge: edge }, newNode)(graph);
-                                       }
-                                   }
-                               }
-
-                               // if the edge is too short to subdivide as desired, then
-                               // just bound the structure at the existing end node
-                               if (!newNode) newNode = endNode;
-
-                               var splitAction = actionSplit(newNode.id)
-                                   .limitWays(resultWayIDs); // only split selected or created ways
-
-                               // do the split
-                               graph = splitAction(graph);
-                               if (splitAction.getCreatedWayIDs().length) {
-                                   resultWayIDs.push(splitAction.getCreatedWayIDs()[0]);
-                               }
-
-                               return newNode;
-                           }
+           var x = s1[0],
+               y = s1[1];
+           bbox[0] = min$a(bbox[0], x);
+           bbox[1] = min$a(bbox[1], y);
+           bbox[2] = max$5(bbox[2], x);
+           bbox[3] = max$5(bbox[3], y); // Pushing it so the queue is sorted from left to right,
+           // with object on the left having the highest priority.
 
-                           var structEndNode1 = determineEndpoint(edge, edgeNodes[1], endpointLocGetter1);
-                           var structEndNode2 = determineEndpoint([edgeNodes[0].id, structEndNode1.id], edgeNodes[0], endpointLocGetter2);
+           Q.push(e1);
+           Q.push(e2);
+         }
+       }
 
-                           var structureWay = resultWayIDs.map(function(id) {
-                               return graph.entity(id);
-                           }).find(function(way) {
-                               return way.nodes.indexOf(structEndNode1.id) !== -1 &&
-                                   way.nodes.indexOf(structEndNode2.id) !== -1;
-                           });
+       function fillQueue(subject, clipping, sbbox, cbbox, operation) {
+         var eventQueue = new tinyqueue(null, compareEvents);
+         var polygonSet, isExteriorRing, i, ii, j, jj; //, k, kk;
 
-                           var tags = Object.assign({}, structureWay.tags); // copy tags
-                           if (bridgeOrTunnel === 'bridge'){
-                               tags.bridge = 'yes';
-                               tags.layer = '1';
-                           } else {
-                               var tunnelValue = 'yes';
-                               if (getFeatureType(structureWay, graph) === 'waterway') {
-                                   // use `tunnel=culvert` for waterways by default
-                                   tunnelValue = 'culvert';
-                               }
-                               tags.tunnel = tunnelValue;
-                               tags.layer = '-1';
-                           }
-                           // apply the structure tags to the way
-                           graph = actionChangeTags(structureWay.id, tags)(graph);
-                           return graph;
-                       };
+         for (i = 0, ii = subject.length; i < ii; i++) {
+           polygonSet = subject[i];
 
-                       context.perform(action, _t('issues.fix.' + fixTitleID + '.annotation'));
-                       context.enter(modeSelect(context, resultWayIDs));
-                   }
-               });
+           for (j = 0, jj = polygonSet.length; j < jj; j++) {
+             isExteriorRing = j === 0;
+             if (isExteriorRing) contourId++;
+             processPolygon(polygonSet[j], true, contourId, eventQueue, sbbox, isExteriorRing);
            }
+         }
 
-           function makeConnectWaysFix(connectionTags) {
-
-               var fixTitleID = 'connect_features';
-               if (connectionTags.ford) {
-                   fixTitleID = 'connect_using_ford';
-               }
-
-               return new validationIssueFix({
-                   icon: 'iD-icon-crossing',
-                   title: _t('issues.fix.' + fixTitleID + '.title'),
-                   onClick: function(context) {
-                       var loc = this.issue.loc;
-                       var connectionTags = this.issue.data.connectionTags;
-                       var edges = this.issue.data.edges;
+         for (i = 0, ii = clipping.length; i < ii; i++) {
+           polygonSet = clipping[i];
 
-                       context.perform(
-                           function actionConnectCrossingWays(graph) {
-                               // create the new node for the points
-                               var node = osmNode({ loc: loc, tags: connectionTags });
-                               graph = graph.replace(node);
-
-                               var nodesToMerge = [node.id];
-                               var mergeThresholdInMeters = 0.75;
-
-                               edges.forEach(function(edge) {
-                                   var edgeNodes = [graph.entity(edge[0]), graph.entity(edge[1])];
-                                   var closestNodeInfo = geoSphericalClosestNode(edgeNodes, loc);
-                                   // if there is already a point nearby, use that
-                                   if (closestNodeInfo.distance < mergeThresholdInMeters) {
-                                       nodesToMerge.push(closestNodeInfo.node.id);
-                                   // else add the new node to the way
-                                   } else {
-                                       graph = actionAddMidpoint({loc: loc, edge: edge}, node)(graph);
-                                   }
-                               });
-
-                               if (nodesToMerge.length > 1) {
-                                   // if we're using nearby nodes, merge them with the new node
-                                   graph = actionMergeNodes(nodesToMerge, loc)(graph);
-                               }
-
-                               return graph;
-                           },
-                           _t('issues.fix.connect_crossing_features.annotation')
-                       );
-                   }
-               });
+           for (j = 0, jj = polygonSet.length; j < jj; j++) {
+             isExteriorRing = j === 0;
+             if (operation === DIFFERENCE) isExteriorRing = false;
+             if (isExteriorRing) contourId++;
+             processPolygon(polygonSet[j], false, contourId, eventQueue, cbbox, isExteriorRing);
            }
+         }
 
-           function makeChangeLayerFix(higherOrLower) {
-               return new validationIssueFix({
-                   icon: 'iD-icon-' + (higherOrLower === 'higher' ? 'up' : 'down'),
-                   title: _t('issues.fix.tag_this_as_' + higherOrLower + '.title'),
-                   onClick: function(context) {
+         return eventQueue;
+       }
 
-                       var mode = context.mode();
-                       if (!mode || mode.id !== 'select') return;
+       var EMPTY = [];
 
-                       var selectedIDs = mode.selectedIDs();
-                       if (selectedIDs.length !== 1) return;
+       function trivialOperation(subject, clipping, operation) {
+         var result = null;
 
-                       var selectedID = selectedIDs[0];
-                       if (!this.issue.entityIds.some(function(entityId) {
-                           return entityId === selectedID;
-                       })) return;
+         if (subject.length * clipping.length === 0) {
+           if (operation === INTERSECTION) {
+             result = EMPTY;
+           } else if (operation === DIFFERENCE) {
+             result = subject;
+           } else if (operation === UNION || operation === XOR) {
+             result = subject.length === 0 ? clipping : subject;
+           }
+         }
 
-                       var entity = context.hasEntity(selectedID);
-                       if (!entity) return;
+         return result;
+       }
 
-                       var tags = Object.assign({}, entity.tags);   // shallow copy
-                       var layer = tags.layer && Number(tags.layer);
-                       if (layer && !isNaN(layer)) {
-                           if (higherOrLower === 'higher') {
-                               layer += 1;
-                           } else {
-                               layer -= 1;
-                           }
-                       } else {
-                           if (higherOrLower === 'higher') {
-                               layer = 1;
-                           } else {
-                               layer = -1;
-                           }
-                       }
-                       tags.layer = layer.toString();
-                       context.perform(
-                           actionChangeTags(entity.id, tags),
-                           _t('operations.change_tags.annotation')
-                       );
-                   }
-               });
-           }
+       function compareBBoxes(subject, clipping, sbbox, cbbox, operation) {
+         var result = null;
 
-           validation.type = type;
+         if (sbbox[0] > cbbox[2] || cbbox[0] > sbbox[2] || sbbox[1] > cbbox[3] || cbbox[1] > sbbox[3]) {
+           if (operation === INTERSECTION) {
+             result = EMPTY;
+           } else if (operation === DIFFERENCE) {
+             result = subject;
+           } else if (operation === UNION || operation === XOR) {
+             result = subject.concat(clipping);
+           }
+         }
 
-           return validation;
+         return result;
        }
 
-       function validationDisconnectedWay() {
-           var type = 'disconnected_way';
+       function _boolean(subject, clipping, operation) {
+         if (typeof subject[0][0][0] === 'number') {
+           subject = [subject];
+         }
 
-           function isTaggedAsHighway(entity) {
-               return osmRoutableHighwayTagValues[entity.tags.highway];
-           }
+         if (typeof clipping[0][0][0] === 'number') {
+           clipping = [clipping];
+         }
 
-           var validation = function checkDisconnectedWay(entity, graph) {
+         var trivial = trivialOperation(subject, clipping, operation);
 
-               var routingIslandWays = routingIslandForEntity(entity);
-               if (!routingIslandWays) return [];
+         if (trivial) {
+           return trivial === EMPTY ? null : trivial;
+         }
 
-               return [new validationIssue({
-                   type: type,
-                   subtype: 'highway',
-                   severity: 'warning',
-                   message: function(context) {
-                       if (this.entityIds.length === 1) {
-                           var entity = context.hasEntity(this.entityIds[0]);
-                           return entity ? _t('issues.disconnected_way.highway.message', { highway: utilDisplayLabel(entity, context.graph()) }) : '';
-                       }
-                       return _t('issues.disconnected_way.routable.message.multiple', { count: this.entityIds.length.toString() });
-                   },
-                   reference: showReference,
-                   entityIds: Array.from(routingIslandWays).map(function(way) { return way.id; }),
-                   dynamicFixes: makeFixes
-               })];
+         var sbbox = [Infinity, Infinity, -Infinity, -Infinity];
+         var cbbox = [Infinity, Infinity, -Infinity, -Infinity]; // console.time('fill queue');
 
+         var eventQueue = fillQueue(subject, clipping, sbbox, cbbox, operation); //console.timeEnd('fill queue');
 
-               function makeFixes(context) {
+         trivial = compareBBoxes(subject, clipping, sbbox, cbbox, operation);
 
-                   var fixes = [];
+         if (trivial) {
+           return trivial === EMPTY ? null : trivial;
+         } // console.time('subdivide edges');
 
-                   var singleEntity = this.entityIds.length === 1 && context.hasEntity(this.entityIds[0]);
 
-                   if (singleEntity) {
+         var sortedEvents = subdivide(eventQueue, subject, clipping, sbbox, cbbox, operation); //console.timeEnd('subdivide edges');
+         // console.time('connect vertices');
 
-                       if (singleEntity.type === 'way' && !singleEntity.isClosed()) {
+         var contours = connectEdges(sortedEvents); //console.timeEnd('connect vertices');
+         // Convert contours to polygons
 
-                           var textDirection = _mainLocalizer.textDirection();
+         var polygons = [];
 
-                           var startFix = makeContinueDrawingFixIfAllowed(textDirection, singleEntity.first(), 'start');
-                           if (startFix) fixes.push(startFix);
+         for (var i = 0; i < contours.length; i++) {
+           var contour = contours[i];
 
-                           var endFix = makeContinueDrawingFixIfAllowed(textDirection, singleEntity.last(), 'end');
-                           if (endFix) fixes.push(endFix);
-                       }
-                       if (!fixes.length) {
-                           fixes.push(new validationIssueFix({
-                               title: _t('issues.fix.connect_feature.title')
-                           }));
-                       }
+           if (contour.isExterior()) {
+             // The exterior ring goes first
+             var rings = [contour.points]; // Followed by holes if any
 
-                       fixes.push(new validationIssueFix({
-                           icon: 'iD-operation-delete',
-                           title: _t('issues.fix.delete_feature.title'),
-                           entityIds: [singleEntity.id],
-                           onClick: function(context) {
-                               var id = this.issue.entityIds[0];
-                               var operation = operationDelete(context, [id]);
-                               if (!operation.disabled()) {
-                                   operation();
-                               }
-                           }
-                       }));
-                   } else {
-                       fixes.push(new validationIssueFix({
-                           title: _t('issues.fix.connect_features.title')
-                       }));
-                   }
+             for (var j = 0; j < contour.holeIds.length; j++) {
+               var holeId = contour.holeIds[j];
+               rings.push(contours[holeId].points);
+             }
 
-                   return fixes;
-               }
+             polygons.push(rings);
+           }
+         }
 
+         return polygons;
+       }
 
-               function showReference(selection) {
-                   selection.selectAll('.issue-reference')
-                       .data([0])
-                       .enter()
-                       .append('div')
-                       .attr('class', 'issue-reference')
-                       .text(_t('issues.disconnected_way.routable.reference'));
-               }
+       function union(subject, clipping) {
+         return _boolean(subject, clipping, UNION);
+       }
 
-               function routingIslandForEntity(entity) {
+       /*! ieee754. BSD-3-Clause License. Feross Aboukhadijeh <https://feross.org/opensource> */
+       var read$6 = function read(buffer, offset, isLE, mLen, nBytes) {
+         var e, m;
+         var eLen = nBytes * 8 - mLen - 1;
+         var eMax = (1 << eLen) - 1;
+         var eBias = eMax >> 1;
+         var nBits = -7;
+         var i = isLE ? nBytes - 1 : 0;
+         var d = isLE ? -1 : 1;
+         var s = buffer[offset + i];
+         i += d;
+         e = s & (1 << -nBits) - 1;
+         s >>= -nBits;
+         nBits += eLen;
 
-                   var routingIsland = new Set();  // the interconnected routable features
-                   var waysToCheck = [];           // the queue of remaining routable ways to traverse
+         for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8) {}
 
-                   function queueParentWays(node) {
-                       graph.parentWays(node).forEach(function(parentWay) {
-                           if (!routingIsland.has(parentWay) &&    // only check each feature once
-                               isRoutableWay(parentWay, false)) {  // only check routable features
-                               routingIsland.add(parentWay);
-                               waysToCheck.push(parentWay);
-                           }
-                       });
-                   }
+         m = e & (1 << -nBits) - 1;
+         e >>= -nBits;
+         nBits += mLen;
 
-                   if (entity.type === 'way' && isRoutableWay(entity, true)) {
+         for (; nBits > 0; m = m * 256 + buffer[offset + i], i += d, nBits -= 8) {}
 
-                       routingIsland.add(entity);
-                       waysToCheck.push(entity);
+         if (e === 0) {
+           e = 1 - eBias;
+         } else if (e === eMax) {
+           return m ? NaN : (s ? -1 : 1) * Infinity;
+         } else {
+           m = m + Math.pow(2, mLen);
+           e = e - eBias;
+         }
 
-                   } else if (entity.type === 'node' && isRoutableNode(entity)) {
+         return (s ? -1 : 1) * m * Math.pow(2, e - mLen);
+       };
 
-                       routingIsland.add(entity);
-                       queueParentWays(entity);
+       var write$6 = function write(buffer, value, offset, isLE, mLen, nBytes) {
+         var e, m, c;
+         var eLen = nBytes * 8 - mLen - 1;
+         var eMax = (1 << eLen) - 1;
+         var eBias = eMax >> 1;
+         var rt = mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0;
+         var i = isLE ? 0 : nBytes - 1;
+         var d = isLE ? 1 : -1;
+         var s = value < 0 || value === 0 && 1 / value < 0 ? 1 : 0;
+         value = Math.abs(value);
 
-                   } else {
-                       // this feature isn't routable, cannot be a routing island
-                       return null;
-                   }
+         if (isNaN(value) || value === Infinity) {
+           m = isNaN(value) ? 1 : 0;
+           e = eMax;
+         } else {
+           e = Math.floor(Math.log(value) / Math.LN2);
 
-                   while (waysToCheck.length) {
-                       var wayToCheck = waysToCheck.pop();
-                       var childNodes = graph.childNodes(wayToCheck);
-                       for (var i in childNodes) {
-                           var vertex = childNodes[i];
+           if (value * (c = Math.pow(2, -e)) < 1) {
+             e--;
+             c *= 2;
+           }
 
-                           if (isConnectedVertex(vertex)) {
-                               // found a link to the wider network, not a routing island
-                               return null;
-                           }
+           if (e + eBias >= 1) {
+             value += rt / c;
+           } else {
+             value += rt * Math.pow(2, 1 - eBias);
+           }
 
-                           if (isRoutableNode(vertex)) {
-                               routingIsland.add(vertex);
-                           }
+           if (value * c >= 2) {
+             e++;
+             c /= 2;
+           }
 
-                           queueParentWays(vertex);
-                       }
-                   }
+           if (e + eBias >= eMax) {
+             m = 0;
+             e = eMax;
+           } else if (e + eBias >= 1) {
+             m = (value * c - 1) * Math.pow(2, mLen);
+             e = e + eBias;
+           } else {
+             m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen);
+             e = 0;
+           }
+         }
 
-                   // no network link found, this is a routing island, return its members
-                   return routingIsland;
-               }
+         for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}
 
-               function isConnectedVertex(vertex) {
-                   // assume ways overlapping unloaded tiles are connected to the wider road network  - #5938
-                   var osm = services.osm;
-                   if (osm && !osm.isDataLoaded(vertex.loc)) return true;
+         e = e << mLen | m;
+         eLen += mLen;
 
-                   // entrances are considered connected
-                   if (vertex.tags.entrance &&
-                       vertex.tags.entrance !== 'no') return true;
-                   if (vertex.tags.amenity === 'parking_entrance') return true;
+         for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}
 
-                   return false;
-               }
+         buffer[offset + i - d] |= s * 128;
+       };
 
-               function isRoutableNode(node) {
-                   // treat elevators as distinct features in the highway network
-                   if (node.tags.highway === 'elevator') return true;
-                   return false;
-               }
+       var ieee754$1 = {
+         read: read$6,
+         write: write$6
+       };
 
-               function isRoutableWay(way, ignoreInnerWays) {
-                   if (isTaggedAsHighway(way) || way.tags.route === 'ferry') return true;
+       var pbf = Pbf;
 
-                   return graph.parentRelations(way).some(function(parentRelation) {
-                       if (parentRelation.tags.type === 'route' &&
-                           parentRelation.tags.route === 'ferry') return true;
+       function Pbf(buf) {
+         this.buf = ArrayBuffer.isView && ArrayBuffer.isView(buf) ? buf : new Uint8Array(buf || 0);
+         this.pos = 0;
+         this.type = 0;
+         this.length = this.buf.length;
+       }
 
-                       if (parentRelation.isMultipolygon() &&
-                           isTaggedAsHighway(parentRelation) &&
-                           (!ignoreInnerWays || parentRelation.memberById(way.id).role !== 'inner')) return true;
-                   });
-               }
+       Pbf.Varint = 0; // varint: int32, int64, uint32, uint64, sint32, sint64, bool, enum
 
-               function makeContinueDrawingFixIfAllowed(textDirection, vertexID, whichEnd) {
-                   var vertex = graph.hasEntity(vertexID);
-                   if (!vertex || vertex.tags.noexit === 'yes') return null;
+       Pbf.Fixed64 = 1; // 64-bit: double, fixed64, sfixed64
 
-                   var useLeftContinue = (whichEnd === 'start' && textDirection === 'ltr') ||
-                       (whichEnd === 'end' && textDirection === 'rtl');
+       Pbf.Bytes = 2; // length-delimited: string, bytes, embedded messages, packed repeated fields
 
-                   return new validationIssueFix({
-                       icon: 'iD-operation-continue' + (useLeftContinue ? '-left' : ''),
-                       title: _t('issues.fix.continue_from_' + whichEnd + '.title'),
-                       entityIds: [vertexID],
-                       onClick: function(context) {
-                           var wayId = this.issue.entityIds[0];
-                           var way = context.hasEntity(wayId);
-                           var vertexId = this.entityIds[0];
-                           var vertex = context.hasEntity(vertexId);
+       Pbf.Fixed32 = 5; // 32-bit: float, fixed32, sfixed32
 
-                           if (!way || !vertex) return;
+       var SHIFT_LEFT_32 = (1 << 16) * (1 << 16),
+           SHIFT_RIGHT_32 = 1 / SHIFT_LEFT_32; // Threshold chosen based on both benchmarking and knowledge about browser string
+       // data structures (which currently switch structure types at 12 bytes or more)
 
-                           // make sure the vertex is actually visible and editable
-                           var map = context.map();
-                           if (!context.editable() || !map.trimmedExtent().contains(vertex.loc)) {
-                               map.zoomToEase(vertex);
-                           }
+       var TEXT_DECODER_MIN_LENGTH = 12;
+       var utf8TextDecoder = typeof TextDecoder === 'undefined' ? null : new TextDecoder('utf8');
+       Pbf.prototype = {
+         destroy: function destroy() {
+           this.buf = null;
+         },
+         // === READING =================================================================
+         readFields: function readFields(readField, result, end) {
+           end = end || this.length;
 
-                           context.enter(
-                               modeDrawLine(context, wayId, context.graph(), 'line', way.affix(vertexId), true)
-                           );
-                       }
-                   });
-               }
+           while (this.pos < end) {
+             var val = this.readVarint(),
+                 tag = val >> 3,
+                 startPos = this.pos;
+             this.type = val & 0x7;
+             readField(tag, result, this);
+             if (this.pos === startPos) this.skip(val);
+           }
 
-           };
+           return result;
+         },
+         readMessage: function readMessage(readField, result) {
+           return this.readFields(readField, result, this.readVarint() + this.pos);
+         },
+         readFixed32: function readFixed32() {
+           var val = readUInt32(this.buf, this.pos);
+           this.pos += 4;
+           return val;
+         },
+         readSFixed32: function readSFixed32() {
+           var val = readInt32(this.buf, this.pos);
+           this.pos += 4;
+           return val;
+         },
+         // 64-bit int handling is based on github.com/dpw/node-buffer-more-ints (MIT-licensed)
+         readFixed64: function readFixed64() {
+           var val = readUInt32(this.buf, this.pos) + readUInt32(this.buf, this.pos + 4) * SHIFT_LEFT_32;
+           this.pos += 8;
+           return val;
+         },
+         readSFixed64: function readSFixed64() {
+           var val = readUInt32(this.buf, this.pos) + readInt32(this.buf, this.pos + 4) * SHIFT_LEFT_32;
+           this.pos += 8;
+           return val;
+         },
+         readFloat: function readFloat() {
+           var val = ieee754$1.read(this.buf, this.pos, true, 23, 4);
+           this.pos += 4;
+           return val;
+         },
+         readDouble: function readDouble() {
+           var val = ieee754$1.read(this.buf, this.pos, true, 52, 8);
+           this.pos += 8;
+           return val;
+         },
+         readVarint: function readVarint(isSigned) {
+           var buf = this.buf,
+               val,
+               b;
+           b = buf[this.pos++];
+           val = b & 0x7f;
+           if (b < 0x80) return val;
+           b = buf[this.pos++];
+           val |= (b & 0x7f) << 7;
+           if (b < 0x80) return val;
+           b = buf[this.pos++];
+           val |= (b & 0x7f) << 14;
+           if (b < 0x80) return val;
+           b = buf[this.pos++];
+           val |= (b & 0x7f) << 21;
+           if (b < 0x80) return val;
+           b = buf[this.pos];
+           val |= (b & 0x0f) << 28;
+           return readVarintRemainder(val, isSigned, this);
+         },
+         readVarint64: function readVarint64() {
+           // for compatibility with v2.0.1
+           return this.readVarint(true);
+         },
+         readSVarint: function readSVarint() {
+           var num = this.readVarint();
+           return num % 2 === 1 ? (num + 1) / -2 : num / 2; // zigzag encoding
+         },
+         readBoolean: function readBoolean() {
+           return Boolean(this.readVarint());
+         },
+         readString: function readString() {
+           var end = this.readVarint() + this.pos;
+           var pos = this.pos;
+           this.pos = end;
 
-           validation.type = type;
+           if (end - pos >= TEXT_DECODER_MIN_LENGTH && utf8TextDecoder) {
+             // longer strings are fast with the built-in browser TextDecoder API
+             return readUtf8TextDecoder(this.buf, pos, end);
+           } // short strings are fast with our custom implementation
 
-           return validation;
-       }
 
-       function validationFormatting() {
-           var type = 'invalid_format';
+           return readUtf8(this.buf, pos, end);
+         },
+         readBytes: function readBytes() {
+           var end = this.readVarint() + this.pos,
+               buffer = this.buf.subarray(this.pos, end);
+           this.pos = end;
+           return buffer;
+         },
+         // verbose for performance reasons; doesn't affect gzipped size
+         readPackedVarint: function readPackedVarint(arr, isSigned) {
+           if (this.type !== Pbf.Bytes) return arr.push(this.readVarint(isSigned));
+           var end = readPackedEnd(this);
+           arr = arr || [];
 
-           var validation = function(entity) {
-               var issues = [];
+           while (this.pos < end) {
+             arr.push(this.readVarint(isSigned));
+           }
 
-               function isValidEmail(email) {
-                   // Emails in OSM are going to be official so they should be pretty simple
-                   // Using negated lists to better support all possible unicode characters (#6494)
-                   var valid_email = /^[^\(\)\\,":;<>@\[\]]+@[^\(\)\\,":;<>@\[\]\.]+(?:\.[a-z0-9-]+)*$/i;
+           return arr;
+         },
+         readPackedSVarint: function readPackedSVarint(arr) {
+           if (this.type !== Pbf.Bytes) return arr.push(this.readSVarint());
+           var end = readPackedEnd(this);
+           arr = arr || [];
 
-                   // An empty value is also acceptable
-                   return (!email || valid_email.test(email));
-               }
-               /*
-               function isSchemePresent(url) {
-                   var valid_scheme = /^https?:\/\//i;
-                   return (!url || valid_scheme.test(url));
-               }
-               */
-               function showReferenceEmail(selection) {
-                   selection.selectAll('.issue-reference')
-                       .data([0])
-                       .enter()
-                       .append('div')
-                       .attr('class', 'issue-reference')
-                       .text(_t('issues.invalid_format.email.reference'));
-               }
-               /*
-               function showReferenceWebsite(selection) {
-                   selection.selectAll('.issue-reference')
-                       .data([0])
-                       .enter()
-                       .append('div')
-                       .attr('class', 'issue-reference')
-                       .text(t('issues.invalid_format.website.reference'));
-               }
-
-               if (entity.tags.website) {
-                   // Multiple websites are possible
-                   // If ever we support ES6, arrow functions make this nicer
-                   var websites = entity.tags.website
-                       .split(';')
-                       .map(function(s) { return s.trim(); })
-                       .filter(function(x) { return !isSchemePresent(x); });
-
-                   if (websites.length) {
-                       issues.push(new validationIssue({
-                           type: type,
-                           subtype: 'website',
-                           severity: 'warning',
-                           message: function(context) {
-                               var entity = context.hasEntity(this.entityIds[0]);
-                               return entity ? t('issues.invalid_format.website.message' + this.data,
-                                   { feature: utilDisplayLabel(entity, context.graph()), site: websites.join(', ') }) : '';
-                           },
-                           reference: showReferenceWebsite,
-                           entityIds: [entity.id],
-                           hash: websites.join(),
-                           data: (websites.length > 1) ? '_multi' : ''
-                       }));
-                   }
-               }
-               */
-               if (entity.tags.email) {
-                   // Multiple emails are possible
-                   var emails = entity.tags.email
-                       .split(';')
-                       .map(function(s) { return s.trim(); })
-                       .filter(function(x) { return !isValidEmail(x); });
-
-                   if (emails.length) {
-                       issues.push(new validationIssue({
-                           type: type,
-                           subtype: 'email',
-                           severity: 'warning',
-                           message: function(context) {
-                               var entity = context.hasEntity(this.entityIds[0]);
-                               return entity ? _t('issues.invalid_format.email.message' + this.data,
-                                   { feature: utilDisplayLabel(entity, context.graph()), email: emails.join(', ') }) : '';
-                           },
-                           reference: showReferenceEmail,
-                           entityIds: [entity.id],
-                           hash: emails.join(),
-                           data: (emails.length > 1) ? '_multi' : ''
-                       }));
-                   }
-               }
+           while (this.pos < end) {
+             arr.push(this.readSVarint());
+           }
 
-               return issues;
-           };
+           return arr;
+         },
+         readPackedBoolean: function readPackedBoolean(arr) {
+           if (this.type !== Pbf.Bytes) return arr.push(this.readBoolean());
+           var end = readPackedEnd(this);
+           arr = arr || [];
 
-           validation.type = type;
+           while (this.pos < end) {
+             arr.push(this.readBoolean());
+           }
 
-           return validation;
-       }
+           return arr;
+         },
+         readPackedFloat: function readPackedFloat(arr) {
+           if (this.type !== Pbf.Bytes) return arr.push(this.readFloat());
+           var end = readPackedEnd(this);
+           arr = arr || [];
 
-       function validationHelpRequest(context) {
-           var type = 'help_request';
+           while (this.pos < end) {
+             arr.push(this.readFloat());
+           }
 
-           var validation = function checkFixmeTag(entity) {
+           return arr;
+         },
+         readPackedDouble: function readPackedDouble(arr) {
+           if (this.type !== Pbf.Bytes) return arr.push(this.readDouble());
+           var end = readPackedEnd(this);
+           arr = arr || [];
 
-               if (!entity.tags.fixme) return [];
+           while (this.pos < end) {
+             arr.push(this.readDouble());
+           }
 
-               // don't flag fixmes on features added by the user
-               if (entity.version === undefined) return [];
+           return arr;
+         },
+         readPackedFixed32: function readPackedFixed32(arr) {
+           if (this.type !== Pbf.Bytes) return arr.push(this.readFixed32());
+           var end = readPackedEnd(this);
+           arr = arr || [];
 
-               if (entity.v !== undefined) {
-                   var baseEntity = context.history().base().hasEntity(entity.id);
-                   // don't flag fixmes added by the user on existing features
-                   if (!baseEntity || !baseEntity.tags.fixme) return [];
-               }
+           while (this.pos < end) {
+             arr.push(this.readFixed32());
+           }
 
-               return [new validationIssue({
-                   type: type,
-                   subtype: 'fixme_tag',
-                   severity: 'warning',
-                   message: function(context) {
-                       var entity = context.hasEntity(this.entityIds[0]);
-                       return entity ? _t('issues.fixme_tag.message', { feature: utilDisplayLabel(entity, context.graph()) }) : '';
-                   },
-                   dynamicFixes: function() {
-                       return [
-                           new validationIssueFix({
-                               title: _t('issues.fix.address_the_concern.title')
-                           })
-                       ];
-                   },
-                   reference: showReference,
-                   entityIds: [entity.id]
-               })];
+           return arr;
+         },
+         readPackedSFixed32: function readPackedSFixed32(arr) {
+           if (this.type !== Pbf.Bytes) return arr.push(this.readSFixed32());
+           var end = readPackedEnd(this);
+           arr = arr || [];
 
-               function showReference(selection) {
-                   selection.selectAll('.issue-reference')
-                       .data([0])
-                       .enter()
-                       .append('div')
-                       .attr('class', 'issue-reference')
-                       .text(_t('issues.fixme_tag.reference'));
-               }
-           };
+           while (this.pos < end) {
+             arr.push(this.readSFixed32());
+           }
 
-           validation.type = type;
+           return arr;
+         },
+         readPackedFixed64: function readPackedFixed64(arr) {
+           if (this.type !== Pbf.Bytes) return arr.push(this.readFixed64());
+           var end = readPackedEnd(this);
+           arr = arr || [];
 
-           return validation;
-       }
+           while (this.pos < end) {
+             arr.push(this.readFixed64());
+           }
 
-       function validationImpossibleOneway() {
-           var type = 'impossible_oneway';
+           return arr;
+         },
+         readPackedSFixed64: function readPackedSFixed64(arr) {
+           if (this.type !== Pbf.Bytes) return arr.push(this.readSFixed64());
+           var end = readPackedEnd(this);
+           arr = arr || [];
 
-           var validation = function checkImpossibleOneway(entity, graph) {
+           while (this.pos < end) {
+             arr.push(this.readSFixed64());
+           }
 
-               if (entity.type !== 'way' || entity.geometry(graph) !== 'line') return [];
+           return arr;
+         },
+         skip: function skip(val) {
+           var type = val & 0x7;
+           if (type === Pbf.Varint) while (this.buf[this.pos++] > 0x7f) {} else if (type === Pbf.Bytes) this.pos = this.readVarint() + this.pos;else if (type === Pbf.Fixed32) this.pos += 4;else if (type === Pbf.Fixed64) this.pos += 8;else throw new Error('Unimplemented type: ' + type);
+         },
+         // === WRITING =================================================================
+         writeTag: function writeTag(tag, type) {
+           this.writeVarint(tag << 3 | type);
+         },
+         realloc: function realloc(min) {
+           var length = this.length || 16;
 
-               if (entity.isClosed()) return [];
+           while (length < this.pos + min) {
+             length *= 2;
+           }
 
-               if (!typeForWay(entity)) return [];
+           if (length !== this.length) {
+             var buf = new Uint8Array(length);
+             buf.set(this.buf);
+             this.buf = buf;
+             this.length = length;
+           }
+         },
+         finish: function finish() {
+           this.length = this.pos;
+           this.pos = 0;
+           return this.buf.subarray(0, this.length);
+         },
+         writeFixed32: function writeFixed32(val) {
+           this.realloc(4);
+           writeInt32(this.buf, val, this.pos);
+           this.pos += 4;
+         },
+         writeSFixed32: function writeSFixed32(val) {
+           this.realloc(4);
+           writeInt32(this.buf, val, this.pos);
+           this.pos += 4;
+         },
+         writeFixed64: function writeFixed64(val) {
+           this.realloc(8);
+           writeInt32(this.buf, val & -1, this.pos);
+           writeInt32(this.buf, Math.floor(val * SHIFT_RIGHT_32), this.pos + 4);
+           this.pos += 8;
+         },
+         writeSFixed64: function writeSFixed64(val) {
+           this.realloc(8);
+           writeInt32(this.buf, val & -1, this.pos);
+           writeInt32(this.buf, Math.floor(val * SHIFT_RIGHT_32), this.pos + 4);
+           this.pos += 8;
+         },
+         writeVarint: function writeVarint(val) {
+           val = +val || 0;
 
-               if (!isOneway(entity)) return [];
+           if (val > 0xfffffff || val < 0) {
+             writeBigVarint(val, this);
+             return;
+           }
 
-               var firstIssues = issuesForNode(entity, entity.first());
-               var lastIssues = issuesForNode(entity, entity.last());
+           this.realloc(4);
+           this.buf[this.pos++] = val & 0x7f | (val > 0x7f ? 0x80 : 0);
+           if (val <= 0x7f) return;
+           this.buf[this.pos++] = (val >>>= 7) & 0x7f | (val > 0x7f ? 0x80 : 0);
+           if (val <= 0x7f) return;
+           this.buf[this.pos++] = (val >>>= 7) & 0x7f | (val > 0x7f ? 0x80 : 0);
+           if (val <= 0x7f) return;
+           this.buf[this.pos++] = val >>> 7 & 0x7f;
+         },
+         writeSVarint: function writeSVarint(val) {
+           this.writeVarint(val < 0 ? -val * 2 - 1 : val * 2);
+         },
+         writeBoolean: function writeBoolean(val) {
+           this.writeVarint(Boolean(val));
+         },
+         writeString: function writeString(str) {
+           str = String(str);
+           this.realloc(str.length * 4);
+           this.pos++; // reserve 1 byte for short string length
 
-               return firstIssues.concat(lastIssues);
+           var startPos = this.pos; // write the string directly to the buffer and see how much was written
 
-               function typeForWay(way) {
-                   if (way.geometry(graph) !== 'line') return null;
+           this.pos = writeUtf8(this.buf, str, this.pos);
+           var len = this.pos - startPos;
+           if (len >= 0x80) makeRoomForExtraLength(startPos, len, this); // finally, write the message length in the reserved place and restore the position
 
-                   if (osmRoutableHighwayTagValues[way.tags.highway]) return 'highway';
-                   if (osmFlowingWaterwayTagValues[way.tags.waterway]) return 'waterway';
-                   return null;
-               }
+           this.pos = startPos - 1;
+           this.writeVarint(len);
+           this.pos += len;
+         },
+         writeFloat: function writeFloat(val) {
+           this.realloc(4);
+           ieee754$1.write(this.buf, val, this.pos, true, 23, 4);
+           this.pos += 4;
+         },
+         writeDouble: function writeDouble(val) {
+           this.realloc(8);
+           ieee754$1.write(this.buf, val, this.pos, true, 52, 8);
+           this.pos += 8;
+         },
+         writeBytes: function writeBytes(buffer) {
+           var len = buffer.length;
+           this.writeVarint(len);
+           this.realloc(len);
 
-               function isOneway(way) {
-                   if (way.tags.oneway === 'yes') return true;
-                   if (way.tags.oneway) return false;
+           for (var i = 0; i < len; i++) {
+             this.buf[this.pos++] = buffer[i];
+           }
+         },
+         writeRawMessage: function writeRawMessage(fn, obj) {
+           this.pos++; // reserve 1 byte for short message length
+           // write the message directly to the buffer and see how much was written
+
+           var startPos = this.pos;
+           fn(obj, this);
+           var len = this.pos - startPos;
+           if (len >= 0x80) makeRoomForExtraLength(startPos, len, this); // finally, write the message length in the reserved place and restore the position
+
+           this.pos = startPos - 1;
+           this.writeVarint(len);
+           this.pos += len;
+         },
+         writeMessage: function writeMessage(tag, fn, obj) {
+           this.writeTag(tag, Pbf.Bytes);
+           this.writeRawMessage(fn, obj);
+         },
+         writePackedVarint: function writePackedVarint(tag, arr) {
+           if (arr.length) this.writeMessage(tag, _writePackedVarint, arr);
+         },
+         writePackedSVarint: function writePackedSVarint(tag, arr) {
+           if (arr.length) this.writeMessage(tag, _writePackedSVarint, arr);
+         },
+         writePackedBoolean: function writePackedBoolean(tag, arr) {
+           if (arr.length) this.writeMessage(tag, _writePackedBoolean, arr);
+         },
+         writePackedFloat: function writePackedFloat(tag, arr) {
+           if (arr.length) this.writeMessage(tag, _writePackedFloat, arr);
+         },
+         writePackedDouble: function writePackedDouble(tag, arr) {
+           if (arr.length) this.writeMessage(tag, _writePackedDouble, arr);
+         },
+         writePackedFixed32: function writePackedFixed32(tag, arr) {
+           if (arr.length) this.writeMessage(tag, _writePackedFixed, arr);
+         },
+         writePackedSFixed32: function writePackedSFixed32(tag, arr) {
+           if (arr.length) this.writeMessage(tag, _writePackedSFixed, arr);
+         },
+         writePackedFixed64: function writePackedFixed64(tag, arr) {
+           if (arr.length) this.writeMessage(tag, _writePackedFixed2, arr);
+         },
+         writePackedSFixed64: function writePackedSFixed64(tag, arr) {
+           if (arr.length) this.writeMessage(tag, _writePackedSFixed2, arr);
+         },
+         writeBytesField: function writeBytesField(tag, buffer) {
+           this.writeTag(tag, Pbf.Bytes);
+           this.writeBytes(buffer);
+         },
+         writeFixed32Field: function writeFixed32Field(tag, val) {
+           this.writeTag(tag, Pbf.Fixed32);
+           this.writeFixed32(val);
+         },
+         writeSFixed32Field: function writeSFixed32Field(tag, val) {
+           this.writeTag(tag, Pbf.Fixed32);
+           this.writeSFixed32(val);
+         },
+         writeFixed64Field: function writeFixed64Field(tag, val) {
+           this.writeTag(tag, Pbf.Fixed64);
+           this.writeFixed64(val);
+         },
+         writeSFixed64Field: function writeSFixed64Field(tag, val) {
+           this.writeTag(tag, Pbf.Fixed64);
+           this.writeSFixed64(val);
+         },
+         writeVarintField: function writeVarintField(tag, val) {
+           this.writeTag(tag, Pbf.Varint);
+           this.writeVarint(val);
+         },
+         writeSVarintField: function writeSVarintField(tag, val) {
+           this.writeTag(tag, Pbf.Varint);
+           this.writeSVarint(val);
+         },
+         writeStringField: function writeStringField(tag, str) {
+           this.writeTag(tag, Pbf.Bytes);
+           this.writeString(str);
+         },
+         writeFloatField: function writeFloatField(tag, val) {
+           this.writeTag(tag, Pbf.Fixed32);
+           this.writeFloat(val);
+         },
+         writeDoubleField: function writeDoubleField(tag, val) {
+           this.writeTag(tag, Pbf.Fixed64);
+           this.writeDouble(val);
+         },
+         writeBooleanField: function writeBooleanField(tag, val) {
+           this.writeVarintField(tag, Boolean(val));
+         }
+       };
 
-                   for (var key in way.tags) {
-                       if (osmOneWayTags[key] && osmOneWayTags[key][way.tags[key]]) {
-                           return true;
-                       }
-                   }
-                   return false;
-               }
+       function readVarintRemainder(l, s, p) {
+         var buf = p.buf,
+             h,
+             b;
+         b = buf[p.pos++];
+         h = (b & 0x70) >> 4;
+         if (b < 0x80) return toNum(l, h, s);
+         b = buf[p.pos++];
+         h |= (b & 0x7f) << 3;
+         if (b < 0x80) return toNum(l, h, s);
+         b = buf[p.pos++];
+         h |= (b & 0x7f) << 10;
+         if (b < 0x80) return toNum(l, h, s);
+         b = buf[p.pos++];
+         h |= (b & 0x7f) << 17;
+         if (b < 0x80) return toNum(l, h, s);
+         b = buf[p.pos++];
+         h |= (b & 0x7f) << 24;
+         if (b < 0x80) return toNum(l, h, s);
+         b = buf[p.pos++];
+         h |= (b & 0x01) << 31;
+         if (b < 0x80) return toNum(l, h, s);
+         throw new Error('Expected varint not more than 10 bytes');
+       }
 
-               function nodeOccursMoreThanOnce(way, nodeID) {
-                   var occurences = 0;
-                   for (var index in way.nodes) {
-                       if (way.nodes[index] === nodeID) {
-                           occurences += 1;
-                           if (occurences > 1) return true;
-                       }
-                   }
-                   return false;
-               }
+       function readPackedEnd(pbf) {
+         return pbf.type === Pbf.Bytes ? pbf.readVarint() + pbf.pos : pbf.pos + 1;
+       }
 
-               function isConnectedViaOtherTypes(way, node) {
+       function toNum(low, high, isSigned) {
+         if (isSigned) {
+           return high * 0x100000000 + (low >>> 0);
+         }
 
-                   var wayType = typeForWay(way);
+         return (high >>> 0) * 0x100000000 + (low >>> 0);
+       }
 
-                   if (wayType === 'highway') {
-                       // entrances are considered connected
-                       if (node.tags.entrance && node.tags.entrance !== 'no') return true;
-                       if (node.tags.amenity === 'parking_entrance') return true;
-                   } else if (wayType === 'waterway') {
-                       if (node.id === way.first()) {
-                           // multiple waterways may start at the same spring
-                           if (node.tags.natural === 'spring') return true;
-                       } else {
-                           // multiple waterways may end at the same drain
-                           if (node.tags.manhole === 'drain') return true;
-                       }
-                   }
+       function writeBigVarint(val, pbf) {
+         var low, high;
 
-                   return graph.parentWays(node).some(function(parentWay) {
-                       if (parentWay.id === way.id) return false;
+         if (val >= 0) {
+           low = val % 0x100000000 | 0;
+           high = val / 0x100000000 | 0;
+         } else {
+           low = ~(-val % 0x100000000);
+           high = ~(-val / 0x100000000);
 
-                       if (wayType === 'highway') {
+           if (low ^ 0xffffffff) {
+             low = low + 1 | 0;
+           } else {
+             low = 0;
+             high = high + 1 | 0;
+           }
+         }
 
-                           // allow connections to highway areas
-                           if (parentWay.geometry(graph) === 'area' &&
-                               osmRoutableHighwayTagValues[parentWay.tags.highway]) return true;
+         if (val >= 0x10000000000000000 || val < -0x10000000000000000) {
+           throw new Error('Given varint doesn\'t fit into 10 bytes');
+         }
 
-                           // count connections to ferry routes as connected
-                           if (parentWay.tags.route === 'ferry') return true;
+         pbf.realloc(10);
+         writeBigVarintLow(low, high, pbf);
+         writeBigVarintHigh(high, pbf);
+       }
 
-                           return graph.parentRelations(parentWay).some(function(parentRelation) {
-                               if (parentRelation.tags.type === 'route' &&
-                                   parentRelation.tags.route === 'ferry') return true;
+       function writeBigVarintLow(low, high, pbf) {
+         pbf.buf[pbf.pos++] = low & 0x7f | 0x80;
+         low >>>= 7;
+         pbf.buf[pbf.pos++] = low & 0x7f | 0x80;
+         low >>>= 7;
+         pbf.buf[pbf.pos++] = low & 0x7f | 0x80;
+         low >>>= 7;
+         pbf.buf[pbf.pos++] = low & 0x7f | 0x80;
+         low >>>= 7;
+         pbf.buf[pbf.pos] = low & 0x7f;
+       }
 
-                               // allow connections to highway multipolygons
-                               return parentRelation.isMultipolygon() && osmRoutableHighwayTagValues[parentRelation.tags.highway];
-                           });
-                       } else if (wayType === 'waterway') {
-                           // multiple waterways may start or end at a water body at the same node
-                           if (parentWay.tags.natural === 'water' ||
-                               parentWay.tags.natural === 'coastline') return true;
-                       }
-                       return false;
-                   });
-               }
+       function writeBigVarintHigh(high, pbf) {
+         var lsb = (high & 0x07) << 4;
+         pbf.buf[pbf.pos++] |= lsb | ((high >>>= 3) ? 0x80 : 0);
+         if (!high) return;
+         pbf.buf[pbf.pos++] = high & 0x7f | ((high >>>= 7) ? 0x80 : 0);
+         if (!high) return;
+         pbf.buf[pbf.pos++] = high & 0x7f | ((high >>>= 7) ? 0x80 : 0);
+         if (!high) return;
+         pbf.buf[pbf.pos++] = high & 0x7f | ((high >>>= 7) ? 0x80 : 0);
+         if (!high) return;
+         pbf.buf[pbf.pos++] = high & 0x7f | ((high >>>= 7) ? 0x80 : 0);
+         if (!high) return;
+         pbf.buf[pbf.pos++] = high & 0x7f;
+       }
 
-               function issuesForNode(way, nodeID) {
+       function makeRoomForExtraLength(startPos, len, pbf) {
+         var extraLen = len <= 0x3fff ? 1 : len <= 0x1fffff ? 2 : len <= 0xfffffff ? 3 : Math.floor(Math.log(len) / (Math.LN2 * 7)); // if 1 byte isn't enough for encoding message length, shift the data to the right
 
-                   var isFirst = nodeID === way.first();
+         pbf.realloc(extraLen);
 
-                   var wayType = typeForWay(way);
+         for (var i = pbf.pos - 1; i >= startPos; i--) {
+           pbf.buf[i + extraLen] = pbf.buf[i];
+         }
+       }
 
-                   // ignore if this way is self-connected at this node
-                   if (nodeOccursMoreThanOnce(way, nodeID)) return [];
+       function _writePackedVarint(arr, pbf) {
+         for (var i = 0; i < arr.length; i++) {
+           pbf.writeVarint(arr[i]);
+         }
+       }
 
-                   var osm = services.osm;
-                   if (!osm) return [];
+       function _writePackedSVarint(arr, pbf) {
+         for (var i = 0; i < arr.length; i++) {
+           pbf.writeSVarint(arr[i]);
+         }
+       }
 
-                   var node = graph.hasEntity(nodeID);
+       function _writePackedFloat(arr, pbf) {
+         for (var i = 0; i < arr.length; i++) {
+           pbf.writeFloat(arr[i]);
+         }
+       }
 
-                   // ignore if this node or its tile are unloaded
-                   if (!node || !osm.isDataLoaded(node.loc)) return [];
+       function _writePackedDouble(arr, pbf) {
+         for (var i = 0; i < arr.length; i++) {
+           pbf.writeDouble(arr[i]);
+         }
+       }
 
-                   if (isConnectedViaOtherTypes(way, node)) return [];
+       function _writePackedBoolean(arr, pbf) {
+         for (var i = 0; i < arr.length; i++) {
+           pbf.writeBoolean(arr[i]);
+         }
+       }
 
-                   var attachedWaysOfSameType = graph.parentWays(node).filter(function(parentWay) {
-                       if (parentWay.id === way.id) return false;
-                       return typeForWay(parentWay) === wayType;
-                   });
+       function _writePackedFixed(arr, pbf) {
+         for (var i = 0; i < arr.length; i++) {
+           pbf.writeFixed32(arr[i]);
+         }
+       }
 
-                   // assume it's okay for waterways to start or end disconnected for now
-                   if (wayType === 'waterway' && attachedWaysOfSameType.length === 0) return [];
+       function _writePackedSFixed(arr, pbf) {
+         for (var i = 0; i < arr.length; i++) {
+           pbf.writeSFixed32(arr[i]);
+         }
+       }
 
-                   var attachedOneways = attachedWaysOfSameType.filter(function(attachedWay) {
-                       return isOneway(attachedWay);
-                   });
+       function _writePackedFixed2(arr, pbf) {
+         for (var i = 0; i < arr.length; i++) {
+           pbf.writeFixed64(arr[i]);
+         }
+       }
 
-                   // ignore if the way is connected to some non-oneway features
-                   if (attachedOneways.length < attachedWaysOfSameType.length) return [];
+       function _writePackedSFixed2(arr, pbf) {
+         for (var i = 0; i < arr.length; i++) {
+           pbf.writeSFixed64(arr[i]);
+         }
+       } // Buffer code below from https://github.com/feross/buffer, MIT-licensed
 
-                   if (attachedOneways.length) {
-                       var connectedEndpointsOkay = attachedOneways.some(function(attachedOneway) {
-                           if ((isFirst ? attachedOneway.first() : attachedOneway.last()) !== nodeID) return true;
-                           if (nodeOccursMoreThanOnce(attachedOneway, nodeID)) return true;
-                           return false;
-                       });
-                       if (connectedEndpointsOkay) return [];
-                   }
 
-                   var placement = isFirst ? 'start' : 'end',
-                       messageID = wayType + '.',
-                       referenceID = wayType + '.';
+       function readUInt32(buf, pos) {
+         return (buf[pos] | buf[pos + 1] << 8 | buf[pos + 2] << 16) + buf[pos + 3] * 0x1000000;
+       }
 
-                   if (wayType === 'waterway') {
-                       messageID += 'connected.' + placement;
-                       referenceID += 'connected';
-                   } else {
-                       messageID += placement;
-                       referenceID += placement;
-                   }
+       function writeInt32(buf, val, pos) {
+         buf[pos] = val;
+         buf[pos + 1] = val >>> 8;
+         buf[pos + 2] = val >>> 16;
+         buf[pos + 3] = val >>> 24;
+       }
 
-                   return [new validationIssue({
-                       type: type,
-                       subtype: wayType,
-                       severity: 'warning',
-                       message: function(context) {
-                           var entity = context.hasEntity(this.entityIds[0]);
-                           return entity ? _t('issues.impossible_oneway.' + messageID + '.message', {
-                               feature: utilDisplayLabel(entity, context.graph())
-                           }) : '';
-                       },
-                       reference: getReference(referenceID),
-                       entityIds: [way.id, node.id],
-                       dynamicFixes: function() {
-
-                           var fixes = [];
-
-                           if (attachedOneways.length) {
-                               fixes.push(new validationIssueFix({
-                                   icon: 'iD-operation-reverse',
-                                   title: _t('issues.fix.reverse_feature.title'),
-                                   entityIds: [way.id],
-                                   onClick: function(context) {
-                                       var id = this.issue.entityIds[0];
-                                       context.perform(actionReverse(id), _t('operations.reverse.annotation'));
-                                   }
-                               }));
-                           }
-                           if (node.tags.noexit !== 'yes') {
-                               var textDirection = _mainLocalizer.textDirection();
-                               var useLeftContinue = (isFirst && textDirection === 'ltr') ||
-                                   (!isFirst && textDirection === 'rtl');
-                               fixes.push(new validationIssueFix({
-                                   icon: 'iD-operation-continue' + (useLeftContinue ? '-left' : ''),
-                                   title: _t('issues.fix.continue_from_' + (isFirst ? 'start' : 'end') + '.title'),
-                                   onClick: function(context) {
-                                       var entityID = this.issue.entityIds[0];
-                                       var vertexID = this.issue.entityIds[1];
-                                       var way = context.entity(entityID);
-                                       var vertex = context.entity(vertexID);
-                                       continueDrawing(way, vertex, context);
-                                   }
-                               }));
-                           }
+       function readInt32(buf, pos) {
+         return (buf[pos] | buf[pos + 1] << 8 | buf[pos + 2] << 16) + (buf[pos + 3] << 24);
+       }
 
-                           return fixes;
-                       },
-                       loc: node.loc
-                   })];
-
-                   function getReference(referenceID) {
-                       return function showReference(selection) {
-                           selection.selectAll('.issue-reference')
-                               .data([0])
-                               .enter()
-                               .append('div')
-                               .attr('class', 'issue-reference')
-                               .text(_t('issues.impossible_oneway.' + referenceID + '.reference'));
-                       };
-                   }
-               }
-           };
+       function readUtf8(buf, pos, end) {
+         var str = '';
+         var i = pos;
 
-           function continueDrawing(way, vertex, context) {
-               // make sure the vertex is actually visible and editable
-               var map = context.map();
-               if (!context.editable() || !map.trimmedExtent().contains(vertex.loc)) {
-                   map.zoomToEase(vertex);
-               }
+         while (i < end) {
+           var b0 = buf[i];
+           var c = null; // codepoint
 
-               context.enter(
-                   modeDrawLine(context, way.id, context.graph(), 'line', way.affix(vertex.id), true)
-               );
-           }
+           var bytesPerSequence = b0 > 0xEF ? 4 : b0 > 0xDF ? 3 : b0 > 0xBF ? 2 : 1;
+           if (i + bytesPerSequence > end) break;
+           var b1, b2, b3;
 
-           validation.type = type;
+           if (bytesPerSequence === 1) {
+             if (b0 < 0x80) {
+               c = b0;
+             }
+           } else if (bytesPerSequence === 2) {
+             b1 = buf[i + 1];
 
-           return validation;
-       }
+             if ((b1 & 0xC0) === 0x80) {
+               c = (b0 & 0x1F) << 0x6 | b1 & 0x3F;
 
-       function validationIncompatibleSource() {
-           var type = 'incompatible_source';
-           var invalidSources = [
-               {
-                   id:'google', regex:'google', exceptRegex: 'books.google|Google Books|drive.google|googledrive|Google Drive'
+               if (c <= 0x7F) {
+                 c = null;
                }
-           ];
+             }
+           } else if (bytesPerSequence === 3) {
+             b1 = buf[i + 1];
+             b2 = buf[i + 2];
 
-           var validation = function checkIncompatibleSource(entity) {
+             if ((b1 & 0xC0) === 0x80 && (b2 & 0xC0) === 0x80) {
+               c = (b0 & 0xF) << 0xC | (b1 & 0x3F) << 0x6 | b2 & 0x3F;
 
-               var entitySources = entity.tags && entity.tags.source && entity.tags.source.split(';');
+               if (c <= 0x7FF || c >= 0xD800 && c <= 0xDFFF) {
+                 c = null;
+               }
+             }
+           } else if (bytesPerSequence === 4) {
+             b1 = buf[i + 1];
+             b2 = buf[i + 2];
+             b3 = buf[i + 3];
 
-               if (!entitySources) return [];
+             if ((b1 & 0xC0) === 0x80 && (b2 & 0xC0) === 0x80 && (b3 & 0xC0) === 0x80) {
+               c = (b0 & 0xF) << 0x12 | (b1 & 0x3F) << 0xC | (b2 & 0x3F) << 0x6 | b3 & 0x3F;
 
-               var issues = [];
+               if (c <= 0xFFFF || c >= 0x110000) {
+                 c = null;
+               }
+             }
+           }
 
-               invalidSources.forEach(function(invalidSource) {
+           if (c === null) {
+             c = 0xFFFD;
+             bytesPerSequence = 1;
+           } else if (c > 0xFFFF) {
+             c -= 0x10000;
+             str += String.fromCharCode(c >>> 10 & 0x3FF | 0xD800);
+             c = 0xDC00 | c & 0x3FF;
+           }
 
-                   var hasInvalidSource = entitySources.some(function(source) {
-                       if (!source.match(new RegExp(invalidSource.regex, 'i'))) return false;
-                       if (invalidSource.exceptRegex && source.match(new RegExp(invalidSource.exceptRegex, 'i'))) return false;
-                       return true;
-                   });
+           str += String.fromCharCode(c);
+           i += bytesPerSequence;
+         }
 
-                   if (!hasInvalidSource) return;
+         return str;
+       }
 
-                   issues.push(new validationIssue({
-                       type: type,
-                       severity: 'warning',
-                       message: function(context) {
-                           var entity = context.hasEntity(this.entityIds[0]);
-                           return entity ? _t('issues.incompatible_source.' + invalidSource.id + '.feature.message', {
-                               feature: utilDisplayLabel(entity, context.graph())
-                           }) : '';
-                       },
-                       reference: getReference(invalidSource.id),
-                       entityIds: [entity.id],
-                       dynamicFixes: function() {
-                           return [
-                               new validationIssueFix({
-                                   title: _t('issues.fix.remove_proprietary_data.title')
-                               })
-                           ];
-                       }
-                   }));
-               });
+       function readUtf8TextDecoder(buf, pos, end) {
+         return utf8TextDecoder.decode(buf.subarray(pos, end));
+       }
 
-               return issues;
+       function writeUtf8(buf, str, pos) {
+         for (var i = 0, c, lead; i < str.length; i++) {
+           c = str.charCodeAt(i); // code point
+
+           if (c > 0xD7FF && c < 0xE000) {
+             if (lead) {
+               if (c < 0xDC00) {
+                 buf[pos++] = 0xEF;
+                 buf[pos++] = 0xBF;
+                 buf[pos++] = 0xBD;
+                 lead = c;
+                 continue;
+               } else {
+                 c = lead - 0xD800 << 10 | c - 0xDC00 | 0x10000;
+                 lead = null;
+               }
+             } else {
+               if (c > 0xDBFF || i + 1 === str.length) {
+                 buf[pos++] = 0xEF;
+                 buf[pos++] = 0xBF;
+                 buf[pos++] = 0xBD;
+               } else {
+                 lead = c;
+               }
 
+               continue;
+             }
+           } else if (lead) {
+             buf[pos++] = 0xEF;
+             buf[pos++] = 0xBF;
+             buf[pos++] = 0xBD;
+             lead = null;
+           }
 
-               function getReference(id) {
-                   return function showReference(selection) {
-                       selection.selectAll('.issue-reference')
-                           .data([0])
-                           .enter()
-                           .append('div')
-                           .attr('class', 'issue-reference')
-                           .text(_t('issues.incompatible_source.' + id + '.reference'));
-                   };
+           if (c < 0x80) {
+             buf[pos++] = c;
+           } else {
+             if (c < 0x800) {
+               buf[pos++] = c >> 0x6 | 0xC0;
+             } else {
+               if (c < 0x10000) {
+                 buf[pos++] = c >> 0xC | 0xE0;
+               } else {
+                 buf[pos++] = c >> 0x12 | 0xF0;
+                 buf[pos++] = c >> 0xC & 0x3F | 0x80;
                }
-           };
 
-           validation.type = type;
+               buf[pos++] = c >> 0x6 & 0x3F | 0x80;
+             }
+
+             buf[pos++] = c & 0x3F | 0x80;
+           }
+         }
 
-           return validation;
+         return pos;
        }
 
-       function validationMaprules() {
-           var type = 'maprules';
+       var pointGeometry = Point;
+       /**
+        * A standalone point geometry with useful accessor, comparison, and
+        * modification methods.
+        *
+        * @class Point
+        * @param {Number} x the x-coordinate. this could be longitude or screen
+        * pixels, or any other sort of unit.
+        * @param {Number} y the y-coordinate. this could be latitude or screen
+        * pixels, or any other sort of unit.
+        * @example
+        * var point = new Point(-77, 38);
+        */
+
+       function Point(x, y) {
+         this.x = x;
+         this.y = y;
+       }
 
-           var validation = function checkMaprules(entity, graph) {
-               if (!services.maprules) return [];
+       Point.prototype = {
+         /**
+          * Clone this point, returning a new point that can be modified
+          * without affecting the old one.
+          * @return {Point} the clone
+          */
+         clone: function clone() {
+           return new Point(this.x, this.y);
+         },
 
-               var rules = services.maprules.validationRules();
-               var issues = [];
+         /**
+          * Add this point's x & y coordinates to another point,
+          * yielding a new point.
+          * @param {Point} p the other point
+          * @return {Point} output point
+          */
+         add: function add(p) {
+           return this.clone()._add(p);
+         },
 
-               for (var i = 0; i < rules.length; i++) {
-                   var rule = rules[i];
-                   rule.findIssues(entity, graph, issues);
-               }
+         /**
+          * Subtract this point's x & y coordinates to from point,
+          * yielding a new point.
+          * @param {Point} p the other point
+          * @return {Point} output point
+          */
+         sub: function sub(p) {
+           return this.clone()._sub(p);
+         },
 
-               return issues;
-           };
+         /**
+          * Multiply this point's x & y coordinates by point,
+          * yielding a new point.
+          * @param {Point} p the other point
+          * @return {Point} output point
+          */
+         multByPoint: function multByPoint(p) {
+           return this.clone()._multByPoint(p);
+         },
 
+         /**
+          * Divide this point's x & y coordinates by point,
+          * yielding a new point.
+          * @param {Point} p the other point
+          * @return {Point} output point
+          */
+         divByPoint: function divByPoint(p) {
+           return this.clone()._divByPoint(p);
+         },
 
-           validation.type = type;
+         /**
+          * Multiply this point's x & y coordinates by a factor,
+          * yielding a new point.
+          * @param {Point} k factor
+          * @return {Point} output point
+          */
+         mult: function mult(k) {
+           return this.clone()._mult(k);
+         },
 
-           return validation;
-       }
+         /**
+          * Divide this point's x & y coordinates by a factor,
+          * yielding a new point.
+          * @param {Point} k factor
+          * @return {Point} output point
+          */
+         div: function div(k) {
+           return this.clone()._div(k);
+         },
 
-       function validationMismatchedGeometry() {
-           var type = 'mismatched_geometry';
+         /**
+          * Rotate this point around the 0, 0 origin by an angle a,
+          * given in radians
+          * @param {Number} a angle to rotate around, in radians
+          * @return {Point} output point
+          */
+         rotate: function rotate(a) {
+           return this.clone()._rotate(a);
+         },
 
-           function tagSuggestingLineIsArea(entity) {
-               if (entity.type !== 'way' || entity.isClosed()) return null;
+         /**
+          * Rotate this point around p point by an angle a,
+          * given in radians
+          * @param {Number} a angle to rotate around, in radians
+          * @param {Point} p Point to rotate around
+          * @return {Point} output point
+          */
+         rotateAround: function rotateAround(a, p) {
+           return this.clone()._rotateAround(a, p);
+         },
 
-               var tagSuggestingArea = entity.tagSuggestingArea();
-               if (!tagSuggestingArea) {
-                   return null;
-               }
+         /**
+          * Multiply this point by a 4x1 transformation matrix
+          * @param {Array<Number>} m transformation matrix
+          * @return {Point} output point
+          */
+         matMult: function matMult(m) {
+           return this.clone()._matMult(m);
+         },
 
-               var asLine = _mainPresetIndex.matchTags(tagSuggestingArea, 'line');
-               var asArea = _mainPresetIndex.matchTags(tagSuggestingArea, 'area');
-               if (asLine && asArea && (asLine === asArea)) {
-                   // these tags also allow lines and making this an area wouldn't matter
-                   return null;
-               }
+         /**
+          * Calculate this point but as a unit vector from 0, 0, meaning
+          * that the distance from the resulting point to the 0, 0
+          * coordinate will be equal to 1 and the angle from the resulting
+          * point to the 0, 0 coordinate will be the same as before.
+          * @return {Point} unit vector point
+          */
+         unit: function unit() {
+           return this.clone()._unit();
+         },
 
-               return tagSuggestingArea;
-           }
+         /**
+          * Compute a perpendicular point, where the new y coordinate
+          * is the old x coordinate and the new x coordinate is the old y
+          * coordinate multiplied by -1
+          * @return {Point} perpendicular point
+          */
+         perp: function perp() {
+           return this.clone()._perp();
+         },
 
+         /**
+          * Return a version of this point with the x & y coordinates
+          * rounded to integers.
+          * @return {Point} rounded point
+          */
+         round: function round() {
+           return this.clone()._round();
+         },
 
-           function makeConnectEndpointsFixOnClick(way, graph) {
-               // must have at least three nodes to close this automatically
-               if (way.nodes.length < 3) return null;
+         /**
+          * Return the magitude of this point: this is the Euclidean
+          * distance from the 0, 0 coordinate to this point's x and y
+          * coordinates.
+          * @return {Number} magnitude
+          */
+         mag: function mag() {
+           return Math.sqrt(this.x * this.x + this.y * this.y);
+         },
 
-               var nodes = graph.childNodes(way), testNodes;
-               var firstToLastDistanceMeters = geoSphericalDistance(nodes[0].loc, nodes[nodes.length-1].loc);
+         /**
+          * Judge whether this point is equal to another point, returning
+          * true or false.
+          * @param {Point} other the other point
+          * @return {boolean} whether the points are equal
+          */
+         equals: function equals(other) {
+           return this.x === other.x && this.y === other.y;
+         },
 
-               // if the distance is very small, attempt to merge the endpoints
-               if (firstToLastDistanceMeters < 0.75) {
-                   testNodes = nodes.slice();   // shallow copy
-                   testNodes.pop();
-                   testNodes.push(testNodes[0]);
-                   // make sure this will not create a self-intersection
-                   if (!geoHasSelfIntersections(testNodes, testNodes[0].id)) {
-                       return function(context) {
-                           var way = context.entity(this.issue.entityIds[0]);
-                           context.perform(
-                               actionMergeNodes([way.nodes[0], way.nodes[way.nodes.length-1]], nodes[0].loc),
-                               _t('issues.fix.connect_endpoints.annotation')
-                           );
-                       };
-                   }
-               }
+         /**
+          * Calculate the distance from this point to another point
+          * @param {Point} p the other point
+          * @return {Number} distance
+          */
+         dist: function dist(p) {
+           return Math.sqrt(this.distSqr(p));
+         },
 
-               // if the points were not merged, attempt to close the way
-               testNodes = nodes.slice();   // shallow copy
-               testNodes.push(testNodes[0]);
-               // make sure this will not create a self-intersection
-               if (!geoHasSelfIntersections(testNodes, testNodes[0].id)) {
-                   return function(context) {
-                       var wayId = this.issue.entityIds[0];
-                       var way = context.entity(wayId);
-                       var nodeId = way.nodes[0];
-                       var index = way.nodes.length;
-                       context.perform(
-                           actionAddVertex(wayId, nodeId, index),
-                           _t('issues.fix.connect_endpoints.annotation')
-                       );
-                   };
-               }
-           }
+         /**
+          * Calculate the distance from this point to another point,
+          * without the square root step. Useful if you're comparing
+          * relative distances.
+          * @param {Point} p the other point
+          * @return {Number} distance
+          */
+         distSqr: function distSqr(p) {
+           var dx = p.x - this.x,
+               dy = p.y - this.y;
+           return dx * dx + dy * dy;
+         },
 
-           function lineTaggedAsAreaIssue(entity) {
+         /**
+          * Get the angle from the 0, 0 coordinate to this point, in radians
+          * coordinates.
+          * @return {Number} angle
+          */
+         angle: function angle() {
+           return Math.atan2(this.y, this.x);
+         },
 
-               var tagSuggestingArea = tagSuggestingLineIsArea(entity);
-               if (!tagSuggestingArea) return null;
+         /**
+          * Get the angle from this point to another point, in radians
+          * @param {Point} b the other point
+          * @return {Number} angle
+          */
+         angleTo: function angleTo(b) {
+           return Math.atan2(this.y - b.y, this.x - b.x);
+         },
 
-               return new validationIssue({
-                   type: type,
-                   subtype: 'area_as_line',
-                   severity: 'warning',
-                   message: function(context) {
-                       var entity = context.hasEntity(this.entityIds[0]);
-                       return entity ? _t('issues.tag_suggests_area.message', {
-                           feature: utilDisplayLabel(entity, context.graph()),
-                           tag: utilTagText({ tags: tagSuggestingArea })
-                       }) : '';
-                   },
-                   reference: showReference,
-                   entityIds: [entity.id],
-                   hash: JSON.stringify(tagSuggestingArea),
-                   dynamicFixes: function(context) {
+         /**
+          * Get the angle between this point and another point, in radians
+          * @param {Point} b the other point
+          * @return {Number} angle
+          */
+         angleWith: function angleWith(b) {
+           return this.angleWithSep(b.x, b.y);
+         },
+
+         /*
+          * Find the angle of the two vectors, solving the formula for
+          * the cross product a x b = |a||b|sin(θ) for θ.
+          * @param {Number} x the x-coordinate
+          * @param {Number} y the y-coordinate
+          * @return {Number} the angle in radians
+          */
+         angleWithSep: function angleWithSep(x, y) {
+           return Math.atan2(this.x * y - this.y * x, this.x * x + this.y * y);
+         },
+         _matMult: function _matMult(m) {
+           var x = m[0] * this.x + m[1] * this.y,
+               y = m[2] * this.x + m[3] * this.y;
+           this.x = x;
+           this.y = y;
+           return this;
+         },
+         _add: function _add(p) {
+           this.x += p.x;
+           this.y += p.y;
+           return this;
+         },
+         _sub: function _sub(p) {
+           this.x -= p.x;
+           this.y -= p.y;
+           return this;
+         },
+         _mult: function _mult(k) {
+           this.x *= k;
+           this.y *= k;
+           return this;
+         },
+         _div: function _div(k) {
+           this.x /= k;
+           this.y /= k;
+           return this;
+         },
+         _multByPoint: function _multByPoint(p) {
+           this.x *= p.x;
+           this.y *= p.y;
+           return this;
+         },
+         _divByPoint: function _divByPoint(p) {
+           this.x /= p.x;
+           this.y /= p.y;
+           return this;
+         },
+         _unit: function _unit() {
+           this._div(this.mag());
+
+           return this;
+         },
+         _perp: function _perp() {
+           var y = this.y;
+           this.y = this.x;
+           this.x = -y;
+           return this;
+         },
+         _rotate: function _rotate(angle) {
+           var cos = Math.cos(angle),
+               sin = Math.sin(angle),
+               x = cos * this.x - sin * this.y,
+               y = sin * this.x + cos * this.y;
+           this.x = x;
+           this.y = y;
+           return this;
+         },
+         _rotateAround: function _rotateAround(angle, p) {
+           var cos = Math.cos(angle),
+               sin = Math.sin(angle),
+               x = p.x + cos * (this.x - p.x) - sin * (this.y - p.y),
+               y = p.y + sin * (this.x - p.x) + cos * (this.y - p.y);
+           this.x = x;
+           this.y = y;
+           return this;
+         },
+         _round: function _round() {
+           this.x = Math.round(this.x);
+           this.y = Math.round(this.y);
+           return this;
+         }
+       };
+       /**
+        * Construct a point from an array if necessary, otherwise if the input
+        * is already a Point, or an unknown type, return it unchanged
+        * @param {Array<Number>|Point|*} a any kind of input value
+        * @return {Point} constructed point, or passed-through value.
+        * @example
+        * // this
+        * var point = Point.convert([0, 1]);
+        * // is equivalent to
+        * var point = new Point(0, 1);
+        */
 
-                       var fixes = [];
+       Point.convert = function (a) {
+         if (a instanceof Point) {
+           return a;
+         }
 
-                       var entity = context.entity(this.entityIds[0]);
-                       var connectEndsOnClick = makeConnectEndpointsFixOnClick(entity, context.graph());
+         if (Array.isArray(a)) {
+           return new Point(a[0], a[1]);
+         }
 
-                       fixes.push(new validationIssueFix({
-                           title: _t('issues.fix.connect_endpoints.title'),
-                           onClick: connectEndsOnClick
-                       }));
+         return a;
+       };
 
-                       fixes.push(new validationIssueFix({
-                           icon: 'iD-operation-delete',
-                           title: _t('issues.fix.remove_tag.title'),
-                           onClick: function(context) {
-                               var entityId = this.issue.entityIds[0];
-                               var entity = context.entity(entityId);
-                               var tags = Object.assign({}, entity.tags);  // shallow copy
-                               for (var key in tagSuggestingArea) {
-                                   delete tags[key];
-                               }
-                               context.perform(
-                                   actionChangeTags(entityId, tags),
-                                   _t('issues.fix.remove_tag.annotation')
-                               );
-                           }
-                       }));
+       var vectortilefeature = VectorTileFeature;
 
-                       return fixes;
-                   }
-               });
+       function VectorTileFeature(pbf, end, extent, keys, values) {
+         // Public
+         this.properties = {};
+         this.extent = extent;
+         this.type = 0; // Private
 
+         this._pbf = pbf;
+         this._geometry = -1;
+         this._keys = keys;
+         this._values = values;
+         pbf.readFields(readFeature, this, end);
+       }
 
-               function showReference(selection) {
-                   selection.selectAll('.issue-reference')
-                       .data([0])
-                       .enter()
-                       .append('div')
-                       .attr('class', 'issue-reference')
-                       .text(_t('issues.tag_suggests_area.reference'));
-               }
-           }
+       function readFeature(tag, feature, pbf) {
+         if (tag == 1) feature.id = pbf.readVarint();else if (tag == 2) readTag(pbf, feature);else if (tag == 3) feature.type = pbf.readVarint();else if (tag == 4) feature._geometry = pbf.pos;
+       }
 
-           function vertexTaggedAsPointIssue(entity, graph) {
-               // we only care about nodes
-               if (entity.type !== 'node') return null;
+       function readTag(pbf, feature) {
+         var end = pbf.readVarint() + pbf.pos;
 
-               // ignore tagless points
-               if (Object.keys(entity.tags).length === 0) return null;
+         while (pbf.pos < end) {
+           var key = feature._keys[pbf.readVarint()],
+               value = feature._values[pbf.readVarint()];
 
-               // address lines are special so just ignore them
-               if (entity.isOnAddressLine(graph)) return null;
+           feature.properties[key] = value;
+         }
+       }
 
-               var geometry = entity.geometry(graph);
-               var allowedGeometries = osmNodeGeometriesForTags(entity.tags);
+       VectorTileFeature.types = ['Unknown', 'Point', 'LineString', 'Polygon'];
 
-               if (geometry === 'point' && !allowedGeometries.point && allowedGeometries.vertex) {
+       VectorTileFeature.prototype.loadGeometry = function () {
+         var pbf = this._pbf;
+         pbf.pos = this._geometry;
+         var end = pbf.readVarint() + pbf.pos,
+             cmd = 1,
+             length = 0,
+             x = 0,
+             y = 0,
+             lines = [],
+             line;
 
-                   return new validationIssue({
-                       type: type,
-                       subtype: 'vertex_as_point',
-                       severity: 'warning',
-                       message: function(context) {
-                           var entity = context.hasEntity(this.entityIds[0]);
-                           return entity ? _t('issues.vertex_as_point.message', {
-                               feature: utilDisplayLabel(entity, context.graph())
-                           }) : '';
-                       },
-                       reference: function showReference(selection) {
-                           selection.selectAll('.issue-reference')
-                               .data([0])
-                               .enter()
-                               .append('div')
-                               .attr('class', 'issue-reference')
-                               .text(_t('issues.vertex_as_point.reference'));
-                       },
-                       entityIds: [entity.id]
-                   });
+         while (pbf.pos < end) {
+           if (length <= 0) {
+             var cmdLen = pbf.readVarint();
+             cmd = cmdLen & 0x7;
+             length = cmdLen >> 3;
+           }
 
-               } else if (geometry === 'vertex' && !allowedGeometries.vertex && allowedGeometries.point) {
+           length--;
 
-                   return new validationIssue({
-                       type: type,
-                       subtype: 'point_as_vertex',
-                       severity: 'warning',
-                       message: function(context) {
-                           var entity = context.hasEntity(this.entityIds[0]);
-                           return entity ? _t('issues.point_as_vertex.message', {
-                               feature: utilDisplayLabel(entity, context.graph())
-                           }) : '';
-                       },
-                       reference: function showReference(selection) {
-                           selection.selectAll('.issue-reference')
-                               .data([0])
-                               .enter()
-                               .append('div')
-                               .attr('class', 'issue-reference')
-                               .text(_t('issues.point_as_vertex.reference'));
-                       },
-                       entityIds: [entity.id],
-                       dynamicFixes: function(context) {
-
-                           var entityId = this.entityIds[0];
-
-                           var extractOnClick = null;
-                           if (!context.hasHiddenConnections(entityId)) {
-
-                               extractOnClick = function(context) {
-                                   var entityId = this.issue.entityIds[0];
-                                   var action = actionExtract(entityId);
-                                   context.perform(
-                                       action,
-                                       _t('operations.extract.annotation.single')
-                                   );
-                                   // re-enter mode to trigger updates
-                                   context.enter(modeSelect(context, [action.getExtractedNodeID()]));
-                               };
-                           }
+           if (cmd === 1 || cmd === 2) {
+             x += pbf.readSVarint();
+             y += pbf.readSVarint();
 
-                           return [
-                               new validationIssueFix({
-                                   icon: 'iD-operation-extract',
-                                   title: _t('issues.fix.extract_point.title'),
-                                   onClick: extractOnClick
-                               })
-                           ];
-                       }
-                   });
-               }
+             if (cmd === 1) {
+               // moveTo
+               if (line) lines.push(line);
+               line = [];
+             }
 
-               return null;
+             line.push(new pointGeometry(x, y));
+           } else if (cmd === 7) {
+             // Workaround for https://github.com/mapbox/mapnik-vector-tile/issues/90
+             if (line) {
+               line.push(line[0].clone()); // closePolygon
+             }
+           } else {
+             throw new Error('unknown command ' + cmd);
            }
+         }
 
-           function unclosedMultipolygonPartIssues(entity, graph) {
+         if (line) lines.push(line);
+         return lines;
+       };
 
-               if (entity.type !== 'relation' ||
-                   !entity.isMultipolygon() ||
-                   entity.isDegenerate() ||
-                   // cannot determine issues for incompletely-downloaded relations
-                   !entity.isComplete(graph)) return null;
+       VectorTileFeature.prototype.bbox = function () {
+         var pbf = this._pbf;
+         pbf.pos = this._geometry;
+         var end = pbf.readVarint() + pbf.pos,
+             cmd = 1,
+             length = 0,
+             x = 0,
+             y = 0,
+             x1 = Infinity,
+             x2 = -Infinity,
+             y1 = Infinity,
+             y2 = -Infinity;
 
-               var sequences = osmJoinWays(entity.members, graph);
+         while (pbf.pos < end) {
+           if (length <= 0) {
+             var cmdLen = pbf.readVarint();
+             cmd = cmdLen & 0x7;
+             length = cmdLen >> 3;
+           }
 
-               var issues = [];
+           length--;
 
-               for (var i in sequences) {
-                   var sequence = sequences[i];
+           if (cmd === 1 || cmd === 2) {
+             x += pbf.readSVarint();
+             y += pbf.readSVarint();
+             if (x < x1) x1 = x;
+             if (x > x2) x2 = x;
+             if (y < y1) y1 = y;
+             if (y > y2) y2 = y;
+           } else if (cmd !== 7) {
+             throw new Error('unknown command ' + cmd);
+           }
+         }
 
-                   if (!sequence.nodes) continue;
+         return [x1, y1, x2, y2];
+       };
 
-                   var firstNode = sequence.nodes[0];
-                   var lastNode = sequence.nodes[sequence.nodes.length - 1];
+       VectorTileFeature.prototype.toGeoJSON = function (x, y, z) {
+         var size = this.extent * Math.pow(2, z),
+             x0 = this.extent * x,
+             y0 = this.extent * y,
+             coords = this.loadGeometry(),
+             type = VectorTileFeature.types[this.type],
+             i,
+             j;
 
-                   // part is closed if the first and last nodes are the same
-                   if (firstNode === lastNode) continue;
+         function project(line) {
+           for (var j = 0; j < line.length; j++) {
+             var p = line[j],
+                 y2 = 180 - (p.y + y0) * 360 / size;
+             line[j] = [(p.x + x0) * 360 / size - 180, 360 / Math.PI * Math.atan(Math.exp(y2 * Math.PI / 180)) - 90];
+           }
+         }
 
-                   var issue = new validationIssue({
-                       type: type,
-                       subtype: 'unclosed_multipolygon_part',
-                       severity: 'warning',
-                       message: function(context) {
-                           var entity = context.hasEntity(this.entityIds[0]);
-                           return entity ? _t('issues.unclosed_multipolygon_part.message', {
-                               feature: utilDisplayLabel(entity, context.graph())
-                           }) : '';
-                       },
-                       reference: showReference,
-                       loc: sequence.nodes[0].loc,
-                       entityIds: [entity.id],
-                       hash: sequence.map(function(way) {
-                           return way.id;
-                       }).join()
-                   });
-                   issues.push(issue);
-               }
+         switch (this.type) {
+           case 1:
+             var points = [];
 
-               return issues;
+             for (i = 0; i < coords.length; i++) {
+               points[i] = coords[i][0];
+             }
 
-               function showReference(selection) {
-                   selection.selectAll('.issue-reference')
-                       .data([0])
-                       .enter()
-                       .append('div')
-                       .attr('class', 'issue-reference')
-                       .text(_t('issues.unclosed_multipolygon_part.reference'));
-               }
-           }
+             coords = points;
+             project(coords);
+             break;
 
-           var validation = function checkMismatchedGeometry(entity, graph) {
-               var issues = [
-                   vertexTaggedAsPointIssue(entity, graph),
-                   lineTaggedAsAreaIssue(entity)
-               ];
-               issues = issues.concat(unclosedMultipolygonPartIssues(entity, graph));
-               return issues.filter(Boolean);
-           };
+           case 2:
+             for (i = 0; i < coords.length; i++) {
+               project(coords[i]);
+             }
 
-           validation.type = type;
+             break;
 
-           return validation;
-       }
+           case 3:
+             coords = classifyRings(coords);
 
-       function validationMissingRole() {
-           var type = 'missing_role';
+             for (i = 0; i < coords.length; i++) {
+               for (j = 0; j < coords[i].length; j++) {
+                 project(coords[i][j]);
+               }
+             }
 
-           var validation = function checkMissingRole(entity, graph) {
-               var issues = [];
-               if (entity.type === 'way') {
-                   graph.parentRelations(entity).forEach(function(relation) {
-                       if (!relation.isMultipolygon()) return;
+             break;
+         }
 
-                       var member = relation.memberById(entity.id);
-                       if (member && isMissingRole(member)) {
-                           issues.push(makeIssue(entity, relation, member));
-                       }
-                   });
-               } else if (entity.type === 'relation' && entity.isMultipolygon()) {
-                   entity.indexedMembers().forEach(function(member) {
-                       var way = graph.hasEntity(member.id);
-                       if (way && isMissingRole(member)) {
-                           issues.push(makeIssue(way, entity, member));
-                       }
-                   });
-               }
+         if (coords.length === 1) {
+           coords = coords[0];
+         } else {
+           type = 'Multi' + type;
+         }
 
-               return issues;
-           };
+         var result = {
+           type: "Feature",
+           geometry: {
+             type: type,
+             coordinates: coords
+           },
+           properties: this.properties
+         };
 
+         if ('id' in this) {
+           result.id = this.id;
+         }
 
-           function isMissingRole(member) {
-               return !member.role || !member.role.trim().length;
-           }
+         return result;
+       }; // classifies an array of rings into polygons with outer rings and holes
 
 
-           function makeIssue(way, relation, member) {
-               return new validationIssue({
-                   type: type,
-                   severity: 'warning',
-                   message: function(context) {
-                       var member = context.hasEntity(this.entityIds[1]),
-                           relation = context.hasEntity(this.entityIds[0]);
-                       return (member && relation) ? _t('issues.missing_role.message', {
-                           member: utilDisplayLabel(member, context.graph()),
-                           relation: utilDisplayLabel(relation, context.graph())
-                       }) : '';
-                   },
-                   reference: showReference,
-                   entityIds: [relation.id, way.id],
-                   data: {
-                       member: member
-                   },
-                   hash: member.index.toString(),
-                   dynamicFixes: function() {
-                       return [
-                           makeAddRoleFix('inner'),
-                           makeAddRoleFix('outer'),
-                           new validationIssueFix({
-                               icon: 'iD-operation-delete',
-                               title: _t('issues.fix.remove_from_relation.title'),
-                               onClick: function(context) {
-                                   context.perform(
-                                       actionDeleteMember(this.issue.entityIds[0], this.issue.data.member.index),
-                                       _t('operations.delete_member.annotation')
-                                   );
-                               }
-                           })
-                       ];
-                   }
-               });
+       function classifyRings(rings) {
+         var len = rings.length;
+         if (len <= 1) return [rings];
+         var polygons = [],
+             polygon,
+             ccw;
 
+         for (var i = 0; i < len; i++) {
+           var area = signedArea$1(rings[i]);
+           if (area === 0) continue;
+           if (ccw === undefined) ccw = area < 0;
 
-               function showReference(selection) {
-                   selection.selectAll('.issue-reference')
-                       .data([0])
-                       .enter()
-                       .append('div')
-                       .attr('class', 'issue-reference')
-                       .text(_t('issues.missing_role.multipolygon.reference'));
-               }
+           if (ccw === area < 0) {
+             if (polygon) polygons.push(polygon);
+             polygon = [rings[i]];
+           } else {
+             polygon.push(rings[i]);
            }
+         }
 
+         if (polygon) polygons.push(polygon);
+         return polygons;
+       }
 
-           function makeAddRoleFix(role) {
-               return new validationIssueFix({
-                   title: _t('issues.fix.set_as_' + role + '.title'),
-                   onClick: function(context) {
-                       var oldMember = this.issue.data.member;
-                       var member = { id: this.issue.entityIds[1], type: oldMember.type, role: role };
-                       context.perform(
-                           actionChangeMember(this.issue.entityIds[0], member, oldMember.index),
-                           _t('operations.change_role.annotation')
-                       );
-                   }
-               });
-           }
+       function signedArea$1(ring) {
+         var sum = 0;
 
-           validation.type = type;
+         for (var i = 0, len = ring.length, j = len - 1, p1, p2; i < len; j = i++) {
+           p1 = ring[i];
+           p2 = ring[j];
+           sum += (p2.x - p1.x) * (p1.y + p2.y);
+         }
 
-           return validation;
+         return sum;
        }
 
-       function validationMissingTag(context) {
-           var type = 'missing_tag';
-
-           function hasDescriptiveTags(entity, graph) {
-               var keys = Object.keys(entity.tags)
-                   .filter(function(k) {
-                       if (k === 'area' || k === 'name') {
-                           return false;
-                       } else {
-                           return osmIsInterestingTag(k);
-                       }
-                   });
+       var vectortilelayer = VectorTileLayer;
 
-               if (entity.type === 'relation' &&
-                   keys.length === 1 &&
-                   entity.tags.type === 'multipolygon') {
-                   // this relation's only interesting tag just says its a multipolygon,
-                   // which is not descriptive enough
+       function VectorTileLayer(pbf, end) {
+         // Public
+         this.version = 1;
+         this.name = null;
+         this.extent = 4096;
+         this.length = 0; // Private
 
-                   // It's okay for a simple multipolygon to have no descriptive tags
-                   // if its outer way has them (old model, see `outdated_tags.js`)
-                   return osmOldMultipolygonOuterMemberOfRelation(entity, graph);
-               }
+         this._pbf = pbf;
+         this._keys = [];
+         this._values = [];
+         this._features = [];
+         pbf.readFields(readLayer, this, end);
+         this.length = this._features.length;
+       }
 
-               return keys.length > 0;
-           }
+       function readLayer(tag, layer, pbf) {
+         if (tag === 15) layer.version = pbf.readVarint();else if (tag === 1) layer.name = pbf.readString();else if (tag === 5) layer.extent = pbf.readVarint();else if (tag === 2) layer._features.push(pbf.pos);else if (tag === 3) layer._keys.push(pbf.readString());else if (tag === 4) layer._values.push(readValueMessage(pbf));
+       }
 
-           function isUnknownRoad(entity) {
-               return entity.type === 'way' && entity.tags.highway === 'road';
-           }
+       function readValueMessage(pbf) {
+         var value = null,
+             end = pbf.readVarint() + pbf.pos;
 
-           function isUntypedRelation(entity) {
-               return entity.type === 'relation' && !entity.tags.type;
-           }
+         while (pbf.pos < end) {
+           var tag = pbf.readVarint() >> 3;
+           value = tag === 1 ? pbf.readString() : tag === 2 ? pbf.readFloat() : tag === 3 ? pbf.readDouble() : tag === 4 ? pbf.readVarint64() : tag === 5 ? pbf.readVarint() : tag === 6 ? pbf.readSVarint() : tag === 7 ? pbf.readBoolean() : null;
+         }
 
-           var validation = function checkMissingTag(entity, graph) {
+         return value;
+       } // return feature `i` from this layer as a `VectorTileFeature`
 
-               var subtype;
 
-               var osm = context.connection();
-               var isUnloadedNode = entity.type === 'node' && osm && !osm.isDataLoaded(entity.loc);
+       VectorTileLayer.prototype.feature = function (i) {
+         if (i < 0 || i >= this._features.length) throw new Error('feature index out of bounds');
+         this._pbf.pos = this._features[i];
 
-               // we can't know if the node is a vertex if the tile is undownloaded
-               if (!isUnloadedNode &&
-                   // allow untagged nodes that are part of ways
-                   entity.geometry(graph) !== 'vertex' &&
-                   // allow untagged entities that are part of relations
-                   !entity.hasParentRelations(graph)) {
+         var end = this._pbf.readVarint() + this._pbf.pos;
 
-                   if (Object.keys(entity.tags).length === 0) {
-                       subtype = 'any';
-                   } else if (!hasDescriptiveTags(entity, graph)) {
-                       subtype = 'descriptive';
-                   } else if (isUntypedRelation(entity)) {
-                       subtype = 'relation_type';
-                   }
-               }
+         return new vectortilefeature(this._pbf, end, this.extent, this._keys, this._values);
+       };
 
-               // flag an unknown road even if it's a member of a relation
-               if (!subtype && isUnknownRoad(entity)) {
-                   subtype = 'highway_classification';
-               }
+       var vectortile = VectorTile;
 
-               if (!subtype) return [];
+       function VectorTile(pbf, end) {
+         this.layers = pbf.readFields(readTile, {}, end);
+       }
 
-               var messageID = subtype === 'highway_classification' ? 'unknown_road' : 'missing_tag.' + subtype;
-               var referenceID = subtype === 'highway_classification' ? 'unknown_road' : 'missing_tag';
+       function readTile(tag, layers, pbf) {
+         if (tag === 3) {
+           var layer = new vectortilelayer(pbf, pbf.readVarint() + pbf.pos);
+           if (layer.length) layers[layer.name] = layer;
+         }
+       }
 
-               // can always delete if the user created it in the first place..
-               var canDelete = (entity.version === undefined || entity.v !== undefined);
-               var severity = (canDelete && subtype !== 'highway_classification') ? 'error' : 'warning';
+       var VectorTile$1 = vectortile;
+       var VectorTileFeature$1 = vectortilefeature;
+       var VectorTileLayer$1 = vectortilelayer;
+       var vectorTile = {
+         VectorTile: VectorTile$1,
+         VectorTileFeature: VectorTileFeature$1,
+         VectorTileLayer: VectorTileLayer$1
+       };
 
-               return [new validationIssue({
-                   type: type,
-                   subtype: subtype,
-                   severity: severity,
-                   message: function(context) {
-                       var entity = context.hasEntity(this.entityIds[0]);
-                       return entity ? _t('issues.' + messageID + '.message', {
-                           feature: utilDisplayLabel(entity, context.graph())
-                       }) : '';
-                   },
-                   reference: showReference,
-                   entityIds: [entity.id],
-                   dynamicFixes: function(context) {
+       var tiler$7 = utilTiler().tileSize(512).margin(1);
+       var dispatch$8 = dispatch('loadedData');
 
-                       var fixes = [];
+       var _vtCache;
 
-                       var selectFixType = subtype === 'highway_classification' ? 'select_road_type' : 'select_preset';
+       function abortRequest$7(controller) {
+         controller.abort();
+       }
 
-                       fixes.push(new validationIssueFix({
-                           icon: 'iD-icon-search',
-                           title: _t('issues.fix.' + selectFixType + '.title'),
-                           onClick: function(context) {
-                               context.ui().sidebar.showPresetList();
-                           }
-                       }));
+       function vtToGeoJSON(data, tile, mergeCache) {
+         var vectorTile$1 = new vectorTile.VectorTile(new pbf(data));
+         var layers = Object.keys(vectorTile$1.layers);
 
-                       var deleteOnClick;
-
-                       var id = this.entityIds[0];
-                       var operation = operationDelete(context, [id]);
-                       var disabledReasonID = operation.disabled();
-                       if (!disabledReasonID) {
-                           deleteOnClick = function(context) {
-                               var id = this.issue.entityIds[0];
-                               var operation = operationDelete(context, [id]);
-                               if (!operation.disabled()) {
-                                   operation();
-                               }
-                           };
-                       }
+         if (!Array.isArray(layers)) {
+           layers = [layers];
+         }
 
-                       fixes.push(
-                           new validationIssueFix({
-                               icon: 'iD-operation-delete',
-                               title: _t('issues.fix.delete_feature.title'),
-                               disabledReason: disabledReasonID ? _t('operations.delete.' + disabledReasonID + '.single') : undefined,
-                               onClick: deleteOnClick
-                           })
-                       );
+         var features = [];
+         layers.forEach(function (layerID) {
+           var layer = vectorTile$1.layers[layerID];
 
-                       return fixes;
-                   }
-               })];
+           if (layer) {
+             for (var i = 0; i < layer.length; i++) {
+               var feature = layer.feature(i).toGeoJSON(tile.xyz[0], tile.xyz[1], tile.xyz[2]);
+               var geometry = feature.geometry; // Treat all Polygons as MultiPolygons
 
-               function showReference(selection) {
-                   selection.selectAll('.issue-reference')
-                       .data([0])
-                       .enter()
-                       .append('div')
-                       .attr('class', 'issue-reference')
-                       .text(_t('issues.' + referenceID + '.reference'));
+               if (geometry.type === 'Polygon') {
+                 geometry.type = 'MultiPolygon';
+                 geometry.coordinates = [geometry.coordinates];
                }
-           };
 
-           validation.type = type;
+               var isClipped = false; // Clip to tile bounds
 
-           return validation;
-       }
+               if (geometry.type === 'MultiPolygon') {
+                 var featureClip = turf_bboxClip(feature, tile.extent.rectangle());
 
-       // remove spaces, punctuation, diacritics
-       var simplify = (str) => {
-         return diacritics.remove(
-           str
-             .replace(/&/g, 'and')
-             .replace(/[\s\-=_!"#%'*{},.\/:;?\(\)\[\]@\\$\^*+<>~`’\u00a1\u00a7\u00b6\u00b7\u00bf\u037e\u0387\u055a-\u055f\u0589\u05c0\u05c3\u05c6\u05f3\u05f4\u0609\u060a\u060c\u060d\u061b\u061e\u061f\u066a-\u066d\u06d4\u0700-\u070d\u07f7-\u07f9\u0830-\u083e\u085e\u0964\u0965\u0970\u0af0\u0df4\u0e4f\u0e5a\u0e5b\u0f04-\u0f12\u0f14\u0f85\u0fd0-\u0fd4\u0fd9\u0fda\u104a-\u104f\u10fb\u1360-\u1368\u166d\u166e\u16eb-\u16ed\u1735\u1736\u17d4-\u17d6\u17d8-\u17da\u1800-\u1805\u1807-\u180a\u1944\u1945\u1a1e\u1a1f\u1aa0-\u1aa6\u1aa8-\u1aad\u1b5a-\u1b60\u1bfc-\u1bff\u1c3b-\u1c3f\u1c7e\u1c7f\u1cc0-\u1cc7\u1cd3\u2016\u2017\u2020-\u2027\u2030-\u2038\u203b-\u203e\u2041-\u2043\u2047-\u2051\u2053\u2055-\u205e\u2cf9-\u2cfc\u2cfe\u2cff\u2d70\u2e00\u2e01\u2e06-\u2e08\u2e0b\u2e0e-\u2e16\u2e18\u2e19\u2e1b\u2e1e\u2e1f\u2e2a-\u2e2e\u2e30-\u2e39\u3001-\u3003\u303d\u30fb\ua4fe\ua4ff\ua60d-\ua60f\ua673\ua67e\ua6f2-\ua6f7\ua874-\ua877\ua8ce\ua8cf\ua8f8-\ua8fa\ua92e\ua92f\ua95f\ua9c1-\ua9cd\ua9de\ua9df\uaa5c-\uaa5f\uaade\uaadf\uaaf0\uaaf1\uabeb\ufe10-\ufe16\ufe19\ufe30\ufe45\ufe46\ufe49-\ufe4c\ufe50-\ufe52\ufe54-\ufe57\ufe5f-\ufe61\ufe68\ufe6a\ufe6b\uff01-\uff03\uff05-\uff07\uff0a\uff0c\uff0e\uff0f\uff1a\uff1b\uff1f\uff20\uff3c\uff61\uff64\uff65]+/g,'')
-             .toLowerCase()
-         );
-       };
+                 if (!fastDeepEqual(feature.geometry, featureClip.geometry)) {
+                   // feature = featureClip;
+                   isClipped = true;
+                 }
 
-       // toParts - split a name-suggestion-index key into parts
-       // {
-       //   kvnd:        "amenity/fast_food|Thaï Express~(North America)",
-       //   kvn:         "amenity/fast_food|Thaï Express",
-       //   kv:          "amenity/fast_food",
-       //   k:           "amenity",
-       //   v:           "fast_food",
-       //   n:           "Thaï Express",
-       //   d:           "(North America)",
-       //   nsimple:     "thaiexpress",
-       //   kvnnsimple:  "amenity/fast_food|thaiexpress"
-       // }
-       var to_parts = (kvnd) => {
-         const parts = {};
-         parts.kvnd = kvnd;
+                 if (!feature.geometry.coordinates.length) continue; // not actually on this tile
 
-         const kvndparts = kvnd.split('~', 2);
-         if (kvndparts.length > 1) parts.d = kvndparts[1];
+                 if (!feature.geometry.coordinates[0].length) continue; // not actually on this tile
+               } // Generate some unique IDs and add some metadata
 
-         parts.kvn = kvndparts[0];
-         const kvnparts = parts.kvn.split('|', 2);
-         if (kvnparts.length > 1) parts.n = kvnparts[1];
 
-         parts.kv = kvnparts[0];
-         const kvparts = parts.kv.split('/', 2);
-         parts.k = kvparts[0];
-         parts.v = kvparts[1];
+               var featurehash = utilHashcode(fastJsonStableStringify(feature));
+               var propertyhash = utilHashcode(fastJsonStableStringify(feature.properties || {}));
+               feature.__layerID__ = layerID.replace(/[^_a-zA-Z0-9\-]/g, '_');
+               feature.__featurehash__ = featurehash;
+               feature.__propertyhash__ = propertyhash;
+               features.push(feature); // Clipped Polygons at same zoom with identical properties can get merged
 
-         parts.nsimple = simplify(parts.n);
-         parts.kvnsimple = parts.kv + '|' + parts.nsimple;
-         return parts;
-       };
+               if (isClipped && geometry.type === 'MultiPolygon') {
+                 var merged = mergeCache[propertyhash];
 
-       var matchGroups = {adult_gaming_centre:["amenity/casino","amenity/gambling","leisure/adult_gaming_centre"],beauty:["shop/beauty","shop/hairdresser_supply"],bed:["shop/bed","shop/furniture"],beverages:["shop/alcohol","shop/beverages"],camping:["leisure/park","tourism/camp_site","tourism/caravan_site"],car_parts:["shop/car_parts","shop/car_repair","shop/tires","shop/tyres"],confectionery:["shop/candy","shop/chocolate","shop/confectionery"],convenience:["shop/beauty","shop/chemist","shop/convenience","shop/cosmetics","shop/newsagent"],coworking:["amenity/coworking_space","office/coworking","office/coworking_space"],electronics:["office/telecommunication","shop/computer","shop/electronics","shop/hifi","shop/mobile","shop/mobile_phone","shop/telecommunication"],fashion:["shop/accessories","shop/bag","shop/botique","shop/clothes","shop/department_store","shop/fashion","shop/fashion_accessories","shop/sports","shop/shoes"],financial:["amenity/bank","office/accountant","office/financial","office/financial_advisor","office/tax_advisor","shop/tax"],fitness:["leisure/fitness_centre","leisure/fitness_center","leisure/sports_centre","leisure/sports_center"],food:["amenity/cafe","amenity/fast_food","amenity/ice_cream","amenity/restaurant","shop/bakery","shop/ice_cream","shop/pastry","shop/tea","shop/coffee"],fuel:["amenity/fuel","shop/gas","shop/convenience;gas","shop/gas;convenience"],gift:["shop/gift","shop/card","shop/cards","shop/stationery"],hardware:["shop/carpet","shop/diy","shop/doityourself","shop/doors","shop/electrical","shop/flooring","shop/hardware","shop/power_tools","shop/tool_hire","shop/tools","shop/trade"],health_food:["shop/health","shop/health_food","shop/herbalist","shop/nutrition_supplements"],houseware:["shop/houseware","shop/interior_decoration"],lodging:["tourism/hotel","tourism/motel"],money_transfer:["amenity/money_transfer","shop/money_transfer"],outdoor:["shop/outdoor","shop/sports"],rental:["amenity/bicycle_rental","amenity/boat_rental","amenity/car_rental","amenity/truck_rental","amenity/vehicle_rental","shop/rental"],school:["amenity/childcare","amenity/college","amenity/kindergarten","amenity/language_school","amenity/prep_school","amenity/school","amenity/university"],supermarket:["shop/food","shop/frozen_food","shop/greengrocer","shop/grocery","shop/supermarket","shop/wholesale"],variety_store:["shop/variety_store","shop/supermarket","shop/discount","shop/convenience"],vending:["amenity/vending_machine","shop/vending_machine"],wholesale:["shop/wholesale","shop/supermarket","shop/department_store"]};
-       var match_groups = {
-       matchGroups: matchGroups
-       };
+                 if (merged && merged.length) {
+                   var other = merged[0];
+                   var coords = union(feature.geometry.coordinates, other.geometry.coordinates);
 
-       var match_groups$1 = /*#__PURE__*/Object.freeze({
-               __proto__: null,
-               matchGroups: matchGroups,
-               'default': match_groups
-       });
+                   if (!coords || !coords.length) {
+                     continue; // something failed in martinez union
+                   }
 
-       var require$$0 = getCjsExportFromNamespace(match_groups$1);
+                   merged.push(feature);
 
-       const matchGroups$1 = require$$0.matchGroups;
+                   for (var j = 0; j < merged.length; j++) {
+                     // all these features get...
+                     merged[j].geometry.coordinates = coords; // same coords
 
+                     merged[j].__featurehash__ = featurehash; // same hash, so deduplication works
+                   }
+                 } else {
+                   mergeCache[propertyhash] = [feature];
+                 }
+               }
+             }
+           }
+         });
+         return features;
+       }
 
-       var matcher$1 = () => {
-         let _warnings = [];  // array of match conflict pairs
-         let _ambiguous = {};
-         let _matchIndex = {};
-         let matcher = {};
+       function loadTile(source, tile) {
+         if (source.loaded[tile.id] || source.inflight[tile.id]) return;
+         var url = source.template.replace('{x}', tile.xyz[0]).replace('{y}', tile.xyz[1]) // TMS-flipped y coordinate
+         .replace(/\{[t-]y\}/, Math.pow(2, tile.xyz[2]) - tile.xyz[1] - 1).replace(/\{z(oom)?\}/, tile.xyz[2]).replace(/\{switch:([^}]+)\}/, function (s, r) {
+           var subdomains = r.split(',');
+           return subdomains[(tile.xyz[0] + tile.xyz[1]) % subdomains.length];
+         });
+         var controller = new AbortController();
+         source.inflight[tile.id] = controller;
+         fetch(url, {
+           signal: controller.signal
+         }).then(function (response) {
+           if (!response.ok) {
+             throw new Error(response.status + ' ' + response.statusText);
+           }
 
+           source.loaded[tile.id] = [];
+           delete source.inflight[tile.id];
+           return response.arrayBuffer();
+         }).then(function (data) {
+           if (!data) {
+             throw new Error('No Data');
+           }
 
-         // Create an index of all the keys/simplenames for fast matching
-         matcher.buildMatchIndex = (brands) => {
-           // two passes - once for primary names, once for secondary/alternate names
-           Object.keys(brands).forEach(kvnd => insertNames(kvnd, 'primary'));
-           Object.keys(brands).forEach(kvnd => insertNames(kvnd, 'secondary'));
+           var z = tile.xyz[2];
 
+           if (!source.canMerge[z]) {
+             source.canMerge[z] = {}; // initialize mergeCache
+           }
 
-           function insertNames(kvnd, which) {
-             const obj = brands[kvnd];
-             const parts = to_parts(kvnd);
+           source.loaded[tile.id] = vtToGeoJSON(data, tile, source.canMerge[z]);
+           dispatch$8.call('loadedData');
+         })["catch"](function () {
+           source.loaded[tile.id] = [];
+           delete source.inflight[tile.id];
+         });
+       }
 
-             // Exit early for ambiguous names in the second pass.
-             // They were collected in the first pass and we don't gather alt names for them.
-             if (which === 'secondary' && parts.d) return;
+       var serviceVectorTile = {
+         init: function init() {
+           if (!_vtCache) {
+             this.reset();
+           }
 
+           this.event = utilRebind(this, dispatch$8, 'on');
+         },
+         reset: function reset() {
+           for (var sourceID in _vtCache) {
+             var source = _vtCache[sourceID];
 
-             if (obj.countryCodes) {
-               parts.countryCodes = obj.countryCodes.slice();  // copy
+             if (source && source.inflight) {
+               Object.values(source.inflight).forEach(abortRequest$7);
              }
+           }
 
-             const nomatches = (obj.nomatch || []);
-             if (nomatches.some(s => s === kvnd)) {
-               console.log(`WARNING match/nomatch conflict for ${kvnd}`);
-               return;
-             }
+           _vtCache = {};
+         },
+         addSource: function addSource(sourceID, template) {
+           _vtCache[sourceID] = {
+             template: template,
+             inflight: {},
+             loaded: {},
+             canMerge: {}
+           };
+           return _vtCache[sourceID];
+         },
+         data: function data(sourceID, projection) {
+           var source = _vtCache[sourceID];
+           if (!source) return [];
+           var tiles = tiler$7.getTiles(projection);
+           var seen = {};
+           var results = [];
 
-             const match_kv = [parts.kv]
-               .concat(obj.matchTags || [])
-               .concat([`${parts.k}/yes`, `building/yes`])   // #3454 - match some generic tags
-               .map(s => s.toLowerCase());
+           for (var i = 0; i < tiles.length; i++) {
+             var features = source.loaded[tiles[i].id];
+             if (!features || !features.length) continue;
 
-             let match_nsimple = [];
-             if (which === 'primary') {
-               match_nsimple = [parts.n]
-                 .concat(obj.matchNames || [])
-                 .concat(obj.tags.official_name || [])   // #2732 - match alternate names
-                 .map(simplify);
+             for (var j = 0; j < features.length; j++) {
+               var feature = features[j];
+               var hash = feature.__featurehash__;
+               if (seen[hash]) continue;
+               seen[hash] = true; // return a shallow copy, because the hash may change
+               // later if this feature gets merged with another
 
-             } else if (which === 'secondary') {
-               match_nsimple = []
-                 .concat(obj.tags.alt_name || [])        // #2732 - match alternate names
-                 .concat(obj.tags.short_name || [])      // #2732 - match alternate names
-                 .map(simplify);
+               results.push(Object.assign({}, feature)); // shallow copy
              }
+           }
 
-             if (!match_nsimple.length) return;  // nothing to do
+           return results;
+         },
+         loadTiles: function loadTiles(sourceID, template, projection) {
+           var source = _vtCache[sourceID];
 
-             match_kv.forEach(kv => {
-               match_nsimple.forEach(nsimple => {
-                 if (parts.d) {
-                   // Known ambiguous names with disambiguation string ~(USA) / ~(Canada)
-                   // FIXME: Name collisions will overwrite the initial entry (ok for now)
-                   if (!_ambiguous[kv]) _ambiguous[kv] = {};
-                   _ambiguous[kv][nsimple] = parts;
+           if (!source) {
+             source = this.addSource(sourceID, template);
+           }
 
-                 } else {
-                   // Names we mostly expect to be unique..
-                   if (!_matchIndex[kv]) _matchIndex[kv] = {};
+           var tiles = tiler$7.getTiles(projection); // abort inflight requests that are no longer needed
 
-                   const m = _matchIndex[kv][nsimple];
-                   if (m) {  // There already is a match for this name, skip it
-                     // Warn if we detect collisions in a primary name.
-                     // Skip warning if a secondary name or a generic `*=yes` tag - #2972 / #3454
-                     if (which === 'primary' && !/\/yes$/.test(kv)) {
-                       _warnings.push([m.kvnd, `${kvnd} (${kv}/${nsimple})`]);
-                     }
-                   } else {
-                     _matchIndex[kv][nsimple] = parts;   // insert
-                   }
-                 }
-               });
+           Object.keys(source.inflight).forEach(function (k) {
+             var wanted = tiles.find(function (tile) {
+               return k === tile.id;
              });
 
+             if (!wanted) {
+               abortRequest$7(source.inflight[k]);
+               delete source.inflight[k];
+             }
+           });
+           tiles.forEach(function (tile) {
+             loadTile(source, tile);
+           });
+         },
+         cache: function cache() {
+           return _vtCache;
+         }
+       };
+
+       var apibase$3 = 'https://www.wikidata.org/w/api.php?';
+       var _wikidataCache = {};
+       var serviceWikidata = {
+         init: function init() {},
+         reset: function reset() {
+           _wikidataCache = {};
+         },
+         // Search for Wikidata items matching the query
+         itemsForSearchQuery: function itemsForSearchQuery(query, callback) {
+           if (!query) {
+             if (callback) callback('No query', {});
+             return;
            }
-         };
 
+           var lang = this.languagesToQuery()[0];
+           var url = apibase$3 + utilQsString({
+             action: 'wbsearchentities',
+             format: 'json',
+             formatversion: 2,
+             search: query,
+             type: 'item',
+             // the language to search
+             language: lang,
+             // the language for the label and description in the result
+             uselang: lang,
+             limit: 10,
+             origin: '*'
+           });
+           d3_json(url).then(function (result) {
+             if (result && result.error) {
+               throw new Error(result.error);
+             }
 
-         // pass a `key`, `value`, `name` and return the best match,
-         // `countryCode` optional (if supplied, must match that too)
-         matcher.matchKVN = (key, value, name, countryCode) => {
-           return matcher.matchParts(to_parts(`${key}/${value}|${name}`), countryCode);
-         };
+             if (callback) callback(null, result.search || {});
+           })["catch"](function (err) {
+             if (callback) callback(err.message, {});
+           });
+         },
+         // Given a Wikipedia language and article title,
+         // return an array of corresponding Wikidata entities.
+         itemsByTitle: function itemsByTitle(lang, title, callback) {
+           if (!title) {
+             if (callback) callback('No title', {});
+             return;
+           }
 
+           lang = lang || 'en';
+           var url = apibase$3 + utilQsString({
+             action: 'wbgetentities',
+             format: 'json',
+             formatversion: 2,
+             sites: lang.replace(/-/g, '_') + 'wiki',
+             titles: title,
+             languages: 'en',
+             // shrink response by filtering to one language
+             origin: '*'
+           });
+           d3_json(url).then(function (result) {
+             if (result && result.error) {
+               throw new Error(result.error);
+             }
 
-         // pass a parts object and return the best match,
-         // `countryCode` optional (if supplied, must match that too)
-         matcher.matchParts = (parts, countryCode) => {
-           let match = null;
-           let inGroup = false;
+             if (callback) callback(null, result.entities || {});
+           })["catch"](function (err) {
+             if (callback) callback(err.message, {});
+           });
+         },
+         languagesToQuery: function languagesToQuery() {
+           return _mainLocalizer.localeCodes().map(function (code) {
+             return code.toLowerCase();
+           }).filter(function (code) {
+             // HACK: en-us isn't a wikidata language. We should really be filtering by
+             // the languages known to be supported by wikidata.
+             return code !== 'en-us';
+           });
+         },
+         entityByQID: function entityByQID(qid, callback) {
+           if (!qid) {
+             callback('No qid', {});
+             return;
+           }
 
-           // fixme: we currently return a single match for ambiguous
-           match = _ambiguous[parts.kv] && _ambiguous[parts.kv][parts.nsimple];
-           if (match && matchesCountryCode(match)) return match;
+           if (_wikidataCache[qid]) {
+             if (callback) callback(null, _wikidataCache[qid]);
+             return;
+           }
 
-           // try to return an exact match
-           match = _matchIndex[parts.kv] && _matchIndex[parts.kv][parts.nsimple];
-           if (match && matchesCountryCode(match)) return match;
+           var langs = this.languagesToQuery();
+           var url = apibase$3 + utilQsString({
+             action: 'wbgetentities',
+             format: 'json',
+             formatversion: 2,
+             ids: qid,
+             props: 'labels|descriptions|claims|sitelinks',
+             sitefilter: langs.map(function (d) {
+               return d + 'wiki';
+             }).join('|'),
+             languages: langs.join('|'),
+             languagefallback: 1,
+             origin: '*'
+           });
+           d3_json(url).then(function (result) {
+             if (result && result.error) {
+               throw new Error(result.error);
+             }
 
-           // look in match groups
-           for (let mg in matchGroups$1) {
-             const matchGroup = matchGroups$1[mg];
-             match = null;
-             inGroup = false;
+             if (callback) callback(null, result.entities[qid] || {});
+           })["catch"](function (err) {
+             if (callback) callback(err.message, {});
+           });
+         },
+         // Pass `params` object of the form:
+         // {
+         //   qid: 'string'      // brand wikidata  (e.g. 'Q37158')
+         // }
+         //
+         // Get an result object used to display tag documentation
+         // {
+         //   title:        'string',
+         //   description:  'string',
+         //   editURL:      'string',
+         //   imageURL:     'string',
+         //   wiki:         { title: 'string', text: 'string', url: 'string' }
+         // }
+         //
+         getDocs: function getDocs(params, callback) {
+           var langs = this.languagesToQuery();
+           this.entityByQID(params.qid, function (err, entity) {
+             if (err || !entity) {
+               callback(err || 'No entity');
+               return;
+             }
 
-             for (let i = 0; i < matchGroup.length; i++) {
-               const otherkv = matchGroup[i].toLowerCase();
-               if (!inGroup) {
-                 inGroup = otherkv === parts.kv;
-               }
-               if (!match) {
-                 // fixme: we currently return a single match for ambiguous
-                 match = _ambiguous[otherkv] && _ambiguous[otherkv][parts.nsimple];
-               }
-               if (!match) {
-                 match = _matchIndex[otherkv] && _matchIndex[otherkv][parts.nsimple];
-               }
+             var i;
+             var description;
 
-               if (match && !matchesCountryCode(match)) {
-                 match = null;
-               }
+             for (i in langs) {
+               var code = langs[i];
 
-               if (inGroup && match) {
-                 return match;
+               if (entity.descriptions[code] && entity.descriptions[code].language === code) {
+                 description = entity.descriptions[code];
+                 break;
                }
              }
-           }
 
-           return null;
-
-           function matchesCountryCode(match) {
-             if (!countryCode) return true;
-             if (!match.countryCodes) return true;
-             return match.countryCodes.indexOf(countryCode) !== -1;
-           }
-         };
+             if (!description && Object.values(entity.descriptions).length) description = Object.values(entity.descriptions)[0]; // prepare result
 
+             var result = {
+               title: entity.id,
+               description: description ? description.value : '',
+               descriptionLocaleCode: description ? description.language : '',
+               editURL: 'https://www.wikidata.org/wiki/' + entity.id
+             }; // add image
 
-         matcher.getWarnings = () => _warnings;
+             if (entity.claims) {
+               var imageroot = 'https://commons.wikimedia.org/w/index.php';
+               var props = ['P154', 'P18']; // logo image, image
 
-         return matcher;
-       };
+               var prop, image;
 
-       var quickselect$1 = createCommonjsModule(function (module, exports) {
-       (function (global, factory) {
-                module.exports = factory() ;
-       }(commonjsGlobal, (function () {
-       function quickselect(arr, k, left, right, compare) {
-           quickselectStep(arr, k, left || 0, right || (arr.length - 1), compare || defaultCompare);
-       }
+               for (i = 0; i < props.length; i++) {
+                 prop = entity.claims[props[i]];
 
-       function quickselectStep(arr, k, left, right, compare) {
+                 if (prop && Object.keys(prop).length > 0) {
+                   image = prop[Object.keys(prop)[0]].mainsnak.datavalue.value;
 
-           while (right > left) {
-               if (right - left > 600) {
-                   var n = right - left + 1;
-                   var m = k - left + 1;
-                   var z = Math.log(n);
-                   var s = 0.5 * Math.exp(2 * z / 3);
-                   var sd = 0.5 * Math.sqrt(z * s * (n - s) / n) * (m - n / 2 < 0 ? -1 : 1);
-                   var newLeft = Math.max(left, Math.floor(k - m * s / n + sd));
-                   var newRight = Math.min(right, Math.floor(k + (n - m) * s / n + sd));
-                   quickselectStep(arr, k, newLeft, newRight, compare);
+                   if (image) {
+                     result.imageURL = imageroot + '?' + utilQsString({
+                       title: 'Special:Redirect/file/' + image,
+                       width: 400
+                     });
+                     break;
+                   }
+                 }
                }
+             }
 
-               var t = arr[k];
-               var i = left;
-               var j = right;
+             if (entity.sitelinks) {
+               var englishLocale = _mainLocalizer.languageCode().toLowerCase() === 'en'; // must be one of these that we requested..
 
-               swap(arr, left, k);
-               if (compare(arr[right], t) > 0) swap(arr, left, right);
+               for (i = 0; i < langs.length; i++) {
+                 // check each, in order of preference
+                 var w = langs[i] + 'wiki';
 
-               while (i < j) {
-                   swap(arr, i, j);
-                   i++;
-                   j--;
-                   while (compare(arr[i], t) < 0) i++;
-                   while (compare(arr[j], t) > 0) j--;
-               }
+                 if (entity.sitelinks[w]) {
+                   var title = entity.sitelinks[w].title;
+                   var tKey = 'inspector.wiki_reference';
 
-               if (compare(arr[left], t) === 0) swap(arr, left, j);
-               else {
-                   j++;
-                   swap(arr, j, right);
+                   if (!englishLocale && langs[i] === 'en') {
+                     // user's locale isn't English but
+                     tKey = 'inspector.wiki_en_reference'; // we are sending them to enwiki anyway..
+                   }
+
+                   result.wiki = {
+                     title: title,
+                     text: tKey,
+                     url: 'https://' + langs[i] + '.wikipedia.org/wiki/' + title.replace(/ /g, '_')
+                   };
+                   break;
+                 }
                }
+             }
 
-               if (j <= k) left = j + 1;
-               if (k <= j) right = j - 1;
-           }
-       }
+             callback(null, result);
+           });
+         }
+       };
 
-       function swap(arr, i, j) {
-           var tmp = arr[i];
-           arr[i] = arr[j];
-           arr[j] = tmp;
-       }
+       var endpoint = 'https://en.wikipedia.org/w/api.php?';
+       var serviceWikipedia = {
+         init: function init() {},
+         reset: function reset() {},
+         search: function search(lang, query, callback) {
+           if (!query) {
+             if (callback) callback('No Query', []);
+             return;
+           }
 
-       function defaultCompare(a, b) {
-           return a < b ? -1 : a > b ? 1 : 0;
-       }
+           lang = lang || 'en';
+           var url = endpoint.replace('en', lang) + utilQsString({
+             action: 'query',
+             list: 'search',
+             srlimit: '10',
+             srinfo: 'suggestion',
+             format: 'json',
+             origin: '*',
+             srsearch: query
+           });
+           d3_json(url).then(function (result) {
+             if (result && result.error) {
+               throw new Error(result.error);
+             } else if (!result || !result.query || !result.query.search) {
+               throw new Error('No Results');
+             }
 
-       return quickselect;
+             if (callback) {
+               var titles = result.query.search.map(function (d) {
+                 return d.title;
+               });
+               callback(null, titles);
+             }
+           })["catch"](function (err) {
+             if (callback) callback(err, []);
+           });
+         },
+         suggestions: function suggestions(lang, query, callback) {
+           if (!query) {
+             if (callback) callback('', []);
+             return;
+           }
 
-       })));
-       });
+           lang = lang || 'en';
+           var url = endpoint.replace('en', lang) + utilQsString({
+             action: 'opensearch',
+             namespace: 0,
+             suggest: '',
+             format: 'json',
+             origin: '*',
+             search: query
+           });
+           d3_json(url).then(function (result) {
+             if (result && result.error) {
+               throw new Error(result.error);
+             } else if (!result || result.length < 2) {
+               throw new Error('No Results');
+             }
 
-       var rbush_1 = rbush;
-       var _default$2 = rbush;
+             if (callback) callback(null, result[1] || []);
+           })["catch"](function (err) {
+             if (callback) callback(err.message, []);
+           });
+         },
+         translations: function translations(lang, title, callback) {
+           if (!title) {
+             if (callback) callback('No Title');
+             return;
+           }
 
+           var url = endpoint.replace('en', lang) + utilQsString({
+             action: 'query',
+             prop: 'langlinks',
+             format: 'json',
+             origin: '*',
+             lllimit: 500,
+             titles: title
+           });
+           d3_json(url).then(function (result) {
+             if (result && result.error) {
+               throw new Error(result.error);
+             } else if (!result || !result.query || !result.query.pages) {
+               throw new Error('No Results');
+             }
 
+             if (callback) {
+               var list = result.query.pages[Object.keys(result.query.pages)[0]];
+               var translations = {};
 
-       function rbush(maxEntries, format) {
-           if (!(this instanceof rbush)) return new rbush(maxEntries, format);
+               if (list && list.langlinks) {
+                 list.langlinks.forEach(function (d) {
+                   translations[d.lang] = d['*'];
+                 });
+               }
 
-           // max entries in a node is 9 by default; min node fill is 40% for best performance
-           this._maxEntries = Math.max(4, maxEntries || 9);
-           this._minEntries = Math.max(2, Math.ceil(this._maxEntries * 0.4));
+               callback(null, translations);
+             }
+           })["catch"](function (err) {
+             if (callback) callback(err.message);
+           });
+         }
+       };
 
-           if (format) {
-               this._initFormat(format);
-           }
+       var services = {
+         geocoder: serviceNominatim,
+         keepRight: serviceKeepRight,
+         improveOSM: serviceImproveOSM,
+         osmose: serviceOsmose,
+         mapillary: serviceMapillary,
+         openstreetcam: serviceOpenstreetcam,
+         osm: serviceOsm,
+         osmWikibase: serviceOsmWikibase,
+         maprules: serviceMapRules,
+         streetside: serviceStreetside,
+         taginfo: serviceTaginfo,
+         vectorTile: serviceVectorTile,
+         wikidata: serviceWikidata,
+         wikipedia: serviceWikipedia
+       };
 
-           this.clear();
+       function svgIcon(name, svgklass, useklass) {
+         return function drawIcon(selection) {
+           selection.selectAll('svg.icon' + (svgklass ? '.' + svgklass.split(' ')[0] : '')).data([0]).enter().append('svg').attr('class', 'icon ' + (svgklass || '')).append('use').attr('xlink:href', name).attr('class', useklass);
+         };
        }
 
-       rbush.prototype = {
-
-           all: function () {
-               return this._all(this.data, []);
-           },
-
-           search: function (bbox) {
-
-               var node = this.data,
-                   result = [],
-                   toBBox = this.toBBox;
+       function uiNoteComments() {
+         var _note;
 
-               if (!intersects$1(bbox, node)) return result;
+         function noteComments(selection) {
+           if (_note.isNew()) return; // don't draw .comments-container
 
-               var nodesToSearch = [],
-                   i, len, child, childBBox;
+           var comments = selection.selectAll('.comments-container').data([0]);
+           comments = comments.enter().append('div').attr('class', 'comments-container').merge(comments);
+           var commentEnter = comments.selectAll('.comment').data(_note.comments).enter().append('div').attr('class', 'comment');
+           commentEnter.append('div').attr('class', function (d) {
+             return 'comment-avatar user-' + d.uid;
+           }).call(svgIcon('#iD-icon-avatar', 'comment-avatar-icon'));
+           var mainEnter = commentEnter.append('div').attr('class', 'comment-main');
+           var metadataEnter = mainEnter.append('div').attr('class', 'comment-metadata');
+           metadataEnter.append('div').attr('class', 'comment-author').each(function (d) {
+             var selection = select(this);
+             var osm = services.osm;
 
-               while (node) {
-                   for (i = 0, len = node.children.length; i < len; i++) {
+             if (osm && d.user) {
+               selection = selection.append('a').attr('class', 'comment-author-link').attr('href', osm.userURL(d.user)).attr('target', '_blank');
+             }
 
-                       child = node.children[i];
-                       childBBox = node.leaf ? toBBox(child) : child;
+             selection.html(function (d) {
+               return d.user || _t.html('note.anonymous');
+             });
+           });
+           metadataEnter.append('div').attr('class', 'comment-date').html(function (d) {
+             return _t('note.status.' + d.action, {
+               when: localeDateString(d.date)
+             });
+           });
+           mainEnter.append('div').attr('class', 'comment-text').html(function (d) {
+             return d.html;
+           }).selectAll('a').attr('rel', 'noopener nofollow').attr('target', '_blank');
+           comments.call(replaceAvatars);
+         }
 
-                       if (intersects$1(bbox, childBBox)) {
-                           if (node.leaf) result.push(child);
-                           else if (contains$2(bbox, childBBox)) this._all(child, result);
-                           else nodesToSearch.push(child);
-                       }
-                   }
-                   node = nodesToSearch.pop();
-               }
+         function replaceAvatars(selection) {
+           var showThirdPartyIcons = corePreferences('preferences.privacy.thirdpartyicons') || 'true';
+           var osm = services.osm;
+           if (showThirdPartyIcons !== 'true' || !osm) return;
+           var uids = {}; // gather uids in the comment thread
 
-               return result;
-           },
+           _note.comments.forEach(function (d) {
+             if (d.uid) uids[d.uid] = true;
+           });
 
-           collides: function (bbox) {
+           Object.keys(uids).forEach(function (uid) {
+             osm.loadUser(uid, function (err, user) {
+               if (!user || !user.image_url) return;
+               selection.selectAll('.comment-avatar.user-' + uid).html('').append('img').attr('class', 'icon comment-avatar-icon').attr('src', user.image_url).attr('alt', user.display_name);
+             });
+           });
+         }
 
-               var node = this.data,
-                   toBBox = this.toBBox;
+         function localeDateString(s) {
+           if (!s) return null;
+           var options = {
+             day: 'numeric',
+             month: 'short',
+             year: 'numeric'
+           };
+           s = s.replace(/-/g, '/'); // fix browser-specific Date() issues
 
-               if (!intersects$1(bbox, node)) return false;
+           var d = new Date(s);
+           if (isNaN(d.getTime())) return null;
+           return d.toLocaleDateString(_mainLocalizer.localeCode(), options);
+         }
 
-               var nodesToSearch = [],
-                   i, len, child, childBBox;
+         noteComments.note = function (val) {
+           if (!arguments.length) return _note;
+           _note = val;
+           return noteComments;
+         };
 
-               while (node) {
-                   for (i = 0, len = node.children.length; i < len; i++) {
+         return noteComments;
+       }
 
-                       child = node.children[i];
-                       childBBox = node.leaf ? toBBox(child) : child;
+       function uiNoteHeader() {
+         var _note;
 
-                       if (intersects$1(bbox, childBBox)) {
-                           if (node.leaf || contains$2(bbox, childBBox)) return true;
-                           nodesToSearch.push(child);
-                       }
-                   }
-                   node = nodesToSearch.pop();
-               }
+         function noteHeader(selection) {
+           var header = selection.selectAll('.note-header').data(_note ? [_note] : [], function (d) {
+             return d.status + d.id;
+           });
+           header.exit().remove();
+           var headerEnter = header.enter().append('div').attr('class', 'note-header');
+           var iconEnter = headerEnter.append('div').attr('class', function (d) {
+             return 'note-header-icon ' + d.status;
+           }).classed('new', function (d) {
+             return d.id < 0;
+           });
+           iconEnter.append('div').attr('class', 'preset-icon-28').call(svgIcon('#iD-icon-note', 'note-fill'));
+           iconEnter.each(function (d) {
+             var statusIcon = '#iD-icon-' + (d.id < 0 ? 'plus' : d.status === 'open' ? 'close' : 'apply');
+             iconEnter.append('div').attr('class', 'note-icon-annotation').call(svgIcon(statusIcon, 'icon-annotation'));
+           });
+           headerEnter.append('div').attr('class', 'note-header-label').html(function (d) {
+             if (_note.isNew()) {
+               return _t('note.new');
+             }
 
-               return false;
-           },
+             return _t('note.note') + ' ' + d.id + ' ' + (d.status === 'closed' ? _t('note.closed') : '');
+           });
+         }
 
-           load: function (data) {
-               if (!(data && data.length)) return this;
+         noteHeader.note = function (val) {
+           if (!arguments.length) return _note;
+           _note = val;
+           return noteHeader;
+         };
 
-               if (data.length < this._minEntries) {
-                   for (var i = 0, len = data.length; i < len; i++) {
-                       this.insert(data[i]);
-                   }
-                   return this;
-               }
+         return noteHeader;
+       }
 
-               // recursively build the tree with the given data from scratch using OMT algorithm
-               var node = this._build(data.slice(), 0, data.length - 1, 0);
+       function uiNoteReport() {
+         var _note;
 
-               if (!this.data.children.length) {
-                   // save as is if tree is empty
-                   this.data = node;
+         function noteReport(selection) {
+           var url;
 
-               } else if (this.data.height === node.height) {
-                   // split root if trees have the same height
-                   this._splitRoot(this.data, node);
+           if (services.osm && _note instanceof osmNote && !_note.isNew()) {
+             url = services.osm.noteReportURL(_note);
+           }
 
-               } else {
-                   if (this.data.height < node.height) {
-                       // swap trees if inserted one is bigger
-                       var tmpNode = this.data;
-                       this.data = node;
-                       node = tmpNode;
-                   }
+           var link = selection.selectAll('.note-report').data(url ? [url] : []); // exit
 
-                   // insert the small tree into the large tree at appropriate level
-                   this._insert(node, this.data.height - node.height - 1, true);
-               }
+           link.exit().remove(); // enter
 
-               return this;
-           },
+           var linkEnter = link.enter().append('a').attr('class', 'note-report').attr('target', '_blank').attr('href', function (d) {
+             return d;
+           }).call(svgIcon('#iD-icon-out-link', 'inline'));
+           linkEnter.append('span').html(_t.html('note.report'));
+         }
 
-           insert: function (item) {
-               if (item) this._insert(item, this.data.height - 1);
-               return this;
-           },
+         noteReport.note = function (val) {
+           if (!arguments.length) return _note;
+           _note = val;
+           return noteReport;
+         };
 
-           clear: function () {
-               this.data = createNode$1([]);
-               return this;
-           },
+         return noteReport;
+       }
 
-           remove: function (item, equalsFn) {
-               if (!item) return this;
+       function uiViewOnOSM(context) {
+         var _what; // an osmEntity or osmNote
 
-               var node = this.data,
-                   bbox = this.toBBox(item),
-                   path = [],
-                   indexes = [],
-                   i, parent, index, goingUp;
 
-               // depth-first iterative tree traversal
-               while (node || path.length) {
+         function viewOnOSM(selection) {
+           var url;
 
-                   if (!node) { // go up
-                       node = path.pop();
-                       parent = path[path.length - 1];
-                       i = indexes.pop();
-                       goingUp = true;
-                   }
+           if (_what instanceof osmEntity) {
+             url = context.connection().entityURL(_what);
+           } else if (_what instanceof osmNote) {
+             url = context.connection().noteURL(_what);
+           }
 
-                   if (node.leaf) { // check current node
-                       index = findItem$1(item, node.children, equalsFn);
+           var data = !_what || _what.isNew() ? [] : [_what];
+           var link = selection.selectAll('.view-on-osm').data(data, function (d) {
+             return d.id;
+           }); // exit
 
-                       if (index !== -1) {
-                           // item found, remove the item and condense tree upwards
-                           node.children.splice(index, 1);
-                           path.push(node);
-                           this._condense(path);
-                           return this;
-                       }
-                   }
+           link.exit().remove(); // enter
 
-                   if (!goingUp && !node.leaf && contains$2(node, bbox)) { // go down
-                       path.push(node);
-                       indexes.push(i);
-                       i = 0;
-                       parent = node;
-                       node = node.children[0];
+           var linkEnter = link.enter().append('a').attr('class', 'view-on-osm').attr('target', '_blank').attr('href', url).call(svgIcon('#iD-icon-out-link', 'inline'));
+           linkEnter.append('span').html(_t.html('inspector.view_on_osm'));
+         }
 
-                   } else if (parent) { // go right
-                       i++;
-                       node = parent.children[i];
-                       goingUp = false;
+         viewOnOSM.what = function (_) {
+           if (!arguments.length) return _what;
+           _what = _;
+           return viewOnOSM;
+         };
 
-                   } else node = null; // nothing found
-               }
+         return viewOnOSM;
+       }
 
-               return this;
-           },
+       function uiNoteEditor(context) {
+         var dispatch$1 = dispatch('change');
+         var noteComments = uiNoteComments();
+         var noteHeader = uiNoteHeader(); // var formFields = uiFormFields(context);
 
-           toBBox: function (item) { return item; },
+         var _note;
 
-           compareMinX: compareNodeMinX$1,
-           compareMinY: compareNodeMinY$1,
+         var _newNote; // var _fieldsArr;
 
-           toJSON: function () { return this.data; },
 
-           fromJSON: function (data) {
-               this.data = data;
-               return this;
-           },
+         function noteEditor(selection) {
+           var header = selection.selectAll('.header').data([0]);
+           var headerEnter = header.enter().append('div').attr('class', 'header fillL');
+           headerEnter.append('button').attr('class', 'close').on('click', function () {
+             context.enter(modeBrowse(context));
+           }).call(svgIcon('#iD-icon-close'));
+           headerEnter.append('h3').html(_t.html('note.title'));
+           var body = selection.selectAll('.body').data([0]);
+           body = body.enter().append('div').attr('class', 'body').merge(body);
+           var editor = body.selectAll('.note-editor').data([0]);
+           editor.enter().append('div').attr('class', 'modal-section note-editor').merge(editor).call(noteHeader.note(_note)).call(noteComments.note(_note)).call(noteSaveSection);
+           var footer = selection.selectAll('.footer').data([0]);
+           footer.enter().append('div').attr('class', 'footer').merge(footer).call(uiViewOnOSM(context).what(_note)).call(uiNoteReport().note(_note)); // rerender the note editor on any auth change
+
+           var osm = services.osm;
+
+           if (osm) {
+             osm.on('change.note-save', function () {
+               selection.call(noteEditor);
+             });
+           }
+         }
 
-           _all: function (node, result) {
-               var nodesToSearch = [];
-               while (node) {
-                   if (node.leaf) result.push.apply(result, node.children);
-                   else nodesToSearch.push.apply(nodesToSearch, node.children);
+         function noteSaveSection(selection) {
+           var isSelected = _note && _note.id === context.selectedNoteID();
 
-                   node = nodesToSearch.pop();
-               }
-               return result;
-           },
+           var noteSave = selection.selectAll('.note-save').data(isSelected ? [_note] : [], function (d) {
+             return d.status + d.id;
+           }); // exit
 
-           _build: function (items, left, right, height) {
+           noteSave.exit().remove(); // enter
 
-               var N = right - left + 1,
-                   M = this._maxEntries,
-                   node;
+           var noteSaveEnter = noteSave.enter().append('div').attr('class', 'note-save save-section cf'); // // if new note, show categories to pick from
+           // if (_note.isNew()) {
+           //     var presets = presetManager;
+           //     // NOTE: this key isn't a age and therefore there is no documentation (yet)
+           //     _fieldsArr = [
+           //         uiField(context, presets.field('category'), null, { show: true, revert: false }),
+           //     ];
+           //     _fieldsArr.forEach(function(field) {
+           //         field
+           //             .on('change', changeCategory);
+           //     });
+           //     noteSaveEnter
+           //         .append('div')
+           //         .attr('class', 'note-category')
+           //         .call(formFields.fieldsArr(_fieldsArr));
+           // }
+           // function changeCategory() {
+           //     // NOTE: perhaps there is a better way to get value
+           //     var val = context.container().select('input[name=\'category\']:checked').property('__data__') || undefined;
+           //     // store the unsaved category with the note itself
+           //     _note = _note.update({ newCategory: val });
+           //     var osm = services.osm;
+           //     if (osm) {
+           //         osm.replaceNote(_note);  // update note cache
+           //     }
+           //     noteSave
+           //         .call(noteSaveButtons);
+           // }
 
-               if (N <= M) {
-                   // reached leaf level; return leaf
-                   node = createNode$1(items.slice(left, right + 1));
-                   calcBBox$1(node, this.toBBox);
-                   return node;
+           noteSaveEnter.append('h4').attr('class', '.note-save-header').html(function () {
+             return _note.isNew() ? _t('note.newDescription') : _t('note.newComment');
+           });
+           var commentTextarea = noteSaveEnter.append('textarea').attr('class', 'new-comment-input').attr('placeholder', _t('note.inputPlaceholder')).attr('maxlength', 1000).property('value', function (d) {
+             return d.newComment;
+           }).call(utilNoAuto).on('keydown.note-input', keydown).on('input.note-input', changeInput).on('blur.note-input', changeInput);
+
+           if (!commentTextarea.empty() && _newNote) {
+             // autofocus the comment field for new notes
+             commentTextarea.node().focus();
+           } // update
+
+
+           noteSave = noteSaveEnter.merge(noteSave).call(userDetails).call(noteSaveButtons); // fast submit if user presses cmd+enter
+
+           function keydown(d3_event) {
+             if (!(d3_event.keyCode === 13 && // ↩ Return
+             d3_event.metaKey)) return;
+             var osm = services.osm;
+             if (!osm) return;
+             var hasAuth = osm.authenticated();
+             if (!hasAuth) return;
+             if (!_note.newComment) return;
+             d3_event.preventDefault();
+             select(this).on('keydown.note-input', null); // focus on button and submit
+
+             window.setTimeout(function () {
+               if (_note.isNew()) {
+                 noteSave.selectAll('.save-button').node().focus();
+                 clickSave();
+               } else {
+                 noteSave.selectAll('.comment-button').node().focus();
+                 clickComment();
                }
+             }, 10);
+           }
 
-               if (!height) {
-                   // target height of the bulk-loaded tree
-                   height = Math.ceil(Math.log(N) / Math.log(M));
-
-                   // target number of root entries to maximize storage utilization
-                   M = Math.ceil(N / Math.pow(M, height - 1));
-               }
+           function changeInput() {
+             var input = select(this);
+             var val = input.property('value').trim() || undefined; // store the unsaved comment with the note itself
 
-               node = createNode$1([]);
-               node.leaf = false;
-               node.height = height;
+             _note = _note.update({
+               newComment: val
+             });
+             var osm = services.osm;
 
-               // split the items into M mostly square tiles
+             if (osm) {
+               osm.replaceNote(_note); // update note cache
+             }
 
-               var N2 = Math.ceil(N / M),
-                   N1 = N2 * Math.ceil(Math.sqrt(M)),
-                   i, j, right2, right3;
+             noteSave.call(noteSaveButtons);
+           }
+         }
 
-               multiSelect$1(items, left, right, N1, this.compareMinX);
+         function userDetails(selection) {
+           var detailSection = selection.selectAll('.detail-section').data([0]);
+           detailSection = detailSection.enter().append('div').attr('class', 'detail-section').merge(detailSection);
+           var osm = services.osm;
+           if (!osm) return; // Add warning if user is not logged in
 
-               for (i = left; i <= right; i += N1) {
+           var hasAuth = osm.authenticated();
+           var authWarning = detailSection.selectAll('.auth-warning').data(hasAuth ? [] : [0]);
+           authWarning.exit().transition().duration(200).style('opacity', 0).remove();
+           var authEnter = authWarning.enter().insert('div', '.tag-reference-body').attr('class', 'field-warning auth-warning').style('opacity', 0);
+           authEnter.call(svgIcon('#iD-icon-alert', 'inline'));
+           authEnter.append('span').html(_t.html('note.login'));
+           authEnter.append('a').attr('target', '_blank').call(svgIcon('#iD-icon-out-link', 'inline')).append('span').html(_t.html('login')).on('click.note-login', function (d3_event) {
+             d3_event.preventDefault();
+             osm.authenticate();
+           });
+           authEnter.transition().duration(200).style('opacity', 1);
+           var prose = detailSection.selectAll('.note-save-prose').data(hasAuth ? [0] : []);
+           prose.exit().remove();
+           prose = prose.enter().append('p').attr('class', 'note-save-prose').html(_t.html('note.upload_explanation')).merge(prose);
+           osm.userDetails(function (err, user) {
+             if (err) return;
+             var userLink = select(document.createElement('div'));
 
-                   right2 = Math.min(i + N1 - 1, right);
+             if (user.image_url) {
+               userLink.append('img').attr('src', user.image_url).attr('class', 'icon pre-text user-icon');
+             }
 
-                   multiSelect$1(items, i, right2, N2, this.compareMinY);
+             userLink.append('a').attr('class', 'user-info').html(user.display_name).attr('href', osm.userURL(user.display_name)).attr('target', '_blank');
+             prose.html(_t.html('note.upload_explanation_with_user', {
+               user: userLink.html()
+             }));
+           });
+         }
 
-                   for (j = i; j <= right2; j += N2) {
+         function noteSaveButtons(selection) {
+           var osm = services.osm;
+           var hasAuth = osm && osm.authenticated();
 
-                       right3 = Math.min(j + N2 - 1, right2);
+           var isSelected = _note && _note.id === context.selectedNoteID();
 
-                       // pack each entry recursively
-                       node.children.push(this._build(items, j, right3, height - 1));
-                   }
-               }
+           var buttonSection = selection.selectAll('.buttons').data(isSelected ? [_note] : [], function (d) {
+             return d.status + d.id;
+           }); // exit
 
-               calcBBox$1(node, this.toBBox);
+           buttonSection.exit().remove(); // enter
 
-               return node;
-           },
+           var buttonEnter = buttonSection.enter().append('div').attr('class', 'buttons');
 
-           _chooseSubtree: function (bbox, node, level, path) {
+           if (_note.isNew()) {
+             buttonEnter.append('button').attr('class', 'button cancel-button secondary-action').html(_t.html('confirm.cancel'));
+             buttonEnter.append('button').attr('class', 'button save-button action').html(_t.html('note.save'));
+           } else {
+             buttonEnter.append('button').attr('class', 'button status-button action');
+             buttonEnter.append('button').attr('class', 'button comment-button action').html(_t.html('note.comment'));
+           } // update
 
-               var i, len, child, targetNode, area, enlargement, minArea, minEnlargement;
 
-               while (true) {
-                   path.push(node);
+           buttonSection = buttonSection.merge(buttonEnter);
+           buttonSection.select('.cancel-button') // select and propagate data
+           .on('click.cancel', clickCancel);
+           buttonSection.select('.save-button') // select and propagate data
+           .attr('disabled', isSaveDisabled).on('click.save', clickSave);
+           buttonSection.select('.status-button') // select and propagate data
+           .attr('disabled', hasAuth ? null : true).html(function (d) {
+             var action = d.status === 'open' ? 'close' : 'open';
+             var andComment = d.newComment ? '_comment' : '';
+             return _t('note.' + action + andComment);
+           }).on('click.status', clickStatus);
+           buttonSection.select('.comment-button') // select and propagate data
+           .attr('disabled', isSaveDisabled).on('click.comment', clickComment);
 
-                   if (node.leaf || path.length - 1 === level) break;
+           function isSaveDisabled(d) {
+             return hasAuth && d.status === 'open' && d.newComment ? null : true;
+           }
+         }
 
-                   minArea = minEnlargement = Infinity;
+         function clickCancel(d3_event, d) {
+           this.blur(); // avoid keeping focus on the button - #4641
 
-                   for (i = 0, len = node.children.length; i < len; i++) {
-                       child = node.children[i];
-                       area = bboxArea$1(child);
-                       enlargement = enlargedArea$1(bbox, child) - area;
+           var osm = services.osm;
 
-                       // choose entry with the least area enlargement
-                       if (enlargement < minEnlargement) {
-                           minEnlargement = enlargement;
-                           minArea = area < minArea ? area : minArea;
-                           targetNode = child;
+           if (osm) {
+             osm.removeNote(d);
+           }
 
-                       } else if (enlargement === minEnlargement) {
-                           // otherwise choose one with the smallest area
-                           if (area < minArea) {
-                               minArea = area;
-                               targetNode = child;
-                           }
-                       }
-                   }
+           context.enter(modeBrowse(context));
+           dispatch$1.call('change');
+         }
 
-                   node = targetNode || node.children[0];
-               }
+         function clickSave(d3_event, d) {
+           this.blur(); // avoid keeping focus on the button - #4641
 
-               return node;
-           },
+           var osm = services.osm;
 
-           _insert: function (item, level, isNode) {
+           if (osm) {
+             osm.postNoteCreate(d, function (err, note) {
+               dispatch$1.call('change', note);
+             });
+           }
+         }
 
-               var toBBox = this.toBBox,
-                   bbox = isNode ? item : toBBox(item),
-                   insertPath = [];
+         function clickStatus(d3_event, d) {
+           this.blur(); // avoid keeping focus on the button - #4641
 
-               // find the best node for accommodating the item, saving all nodes along the path too
-               var node = this._chooseSubtree(bbox, this.data, level, insertPath);
+           var osm = services.osm;
 
-               // put the item into the node
-               node.children.push(item);
-               extend$3(node, bbox);
+           if (osm) {
+             var setStatus = d.status === 'open' ? 'closed' : 'open';
+             osm.postNoteUpdate(d, setStatus, function (err, note) {
+               dispatch$1.call('change', note);
+             });
+           }
+         }
 
-               // split on node overflow; propagate upwards if necessary
-               while (level >= 0) {
-                   if (insertPath[level].children.length > this._maxEntries) {
-                       this._split(insertPath, level);
-                       level--;
-                   } else break;
-               }
+         function clickComment(d3_event, d) {
+           this.blur(); // avoid keeping focus on the button - #4641
 
-               // adjust bboxes along the insertion path
-               this._adjustParentBBoxes(bbox, insertPath, level);
-           },
+           var osm = services.osm;
 
-           // split overflowed node into two
-           _split: function (insertPath, level) {
+           if (osm) {
+             osm.postNoteUpdate(d, d.status, function (err, note) {
+               dispatch$1.call('change', note);
+             });
+           }
+         }
 
-               var node = insertPath[level],
-                   M = node.children.length,
-                   m = this._minEntries;
+         noteEditor.note = function (val) {
+           if (!arguments.length) return _note;
+           _note = val;
+           return noteEditor;
+         };
 
-               this._chooseSplitAxis(node, m, M);
+         noteEditor.newNote = function (val) {
+           if (!arguments.length) return _newNote;
+           _newNote = val;
+           return noteEditor;
+         };
 
-               var splitIndex = this._chooseSplitIndex(node, m, M);
+         return utilRebind(noteEditor, dispatch$1, 'on');
+       }
 
-               var newNode = createNode$1(node.children.splice(splitIndex, node.children.length - splitIndex));
-               newNode.height = node.height;
-               newNode.leaf = node.leaf;
+       function modeSelectNote(context, selectedNoteID) {
+         var mode = {
+           id: 'select-note',
+           button: 'browse'
+         };
 
-               calcBBox$1(node, this.toBBox);
-               calcBBox$1(newNode, this.toBBox);
+         var _keybinding = utilKeybinding('select-note');
 
-               if (level) insertPath[level - 1].children.push(newNode);
-               else this._splitRoot(node, newNode);
-           },
+         var _noteEditor = uiNoteEditor(context).on('change', function () {
+           context.map().pan([0, 0]); // trigger a redraw
 
-           _splitRoot: function (node, newNode) {
-               // split root node
-               this.data = createNode$1([node, newNode]);
-               this.data.height = node.height + 1;
-               this.data.leaf = false;
-               calcBBox$1(this.data, this.toBBox);
-           },
+           var note = checkSelectedID();
+           if (!note) return;
+           context.ui().sidebar.show(_noteEditor.note(note));
+         });
 
-           _chooseSplitIndex: function (node, m, M) {
+         var _behaviors = [behaviorBreathe(), behaviorHover(context), behaviorSelect(context), behaviorLasso(context), modeDragNode(context).behavior, modeDragNote(context).behavior];
+         var _newFeature = false;
 
-               var i, bbox1, bbox2, overlap, area, minOverlap, minArea, index;
+         function checkSelectedID() {
+           if (!services.osm) return;
+           var note = services.osm.getNote(selectedNoteID);
 
-               minOverlap = minArea = Infinity;
+           if (!note) {
+             context.enter(modeBrowse(context));
+           }
 
-               for (i = m; i <= M - m; i++) {
-                   bbox1 = distBBox$1(node, 0, i, this.toBBox);
-                   bbox2 = distBBox$1(node, i, M, this.toBBox);
+           return note;
+         } // class the note as selected, or return to browse mode if the note is gone
 
-                   overlap = intersectionArea$1(bbox1, bbox2);
-                   area = bboxArea$1(bbox1) + bboxArea$1(bbox2);
 
-                   // choose distribution with minimum overlap
-                   if (overlap < minOverlap) {
-                       minOverlap = overlap;
-                       index = i;
+         function selectNote(d3_event, drawn) {
+           if (!checkSelectedID()) return;
+           var selection = context.surface().selectAll('.layer-notes .note-' + selectedNoteID);
 
-                       minArea = area < minArea ? area : minArea;
+           if (selection.empty()) {
+             // Return to browse mode if selected DOM elements have
+             // disappeared because the user moved them out of view..
+             var source = d3_event && d3_event.type === 'zoom' && d3_event.sourceEvent;
 
-                   } else if (overlap === minOverlap) {
-                       // otherwise choose distribution with minimum area
-                       if (area < minArea) {
-                           minArea = area;
-                           index = i;
-                       }
-                   }
-               }
+             if (drawn && source && (source.type === 'pointermove' || source.type === 'mousemove' || source.type === 'touchmove')) {
+               context.enter(modeBrowse(context));
+             }
+           } else {
+             selection.classed('selected', true);
+             context.selectedNoteID(selectedNoteID);
+           }
+         }
 
-               return index;
-           },
+         function esc() {
+           if (context.container().select('.combobox').size()) return;
+           context.enter(modeBrowse(context));
+         }
 
-           // sorts node children by the best axis for split
-           _chooseSplitAxis: function (node, m, M) {
+         mode.zoomToSelected = function () {
+           if (!services.osm) return;
+           var note = services.osm.getNote(selectedNoteID);
 
-               var compareMinX = node.leaf ? this.compareMinX : compareNodeMinX$1,
-                   compareMinY = node.leaf ? this.compareMinY : compareNodeMinY$1,
-                   xMargin = this._allDistMargin(node, m, M, compareMinX),
-                   yMargin = this._allDistMargin(node, m, M, compareMinY);
+           if (note) {
+             context.map().centerZoomEase(note.loc, 20);
+           }
+         };
 
-               // if total distributions margin value is minimal for x, sort by minX,
-               // otherwise it's already sorted by minY
-               if (xMargin < yMargin) node.children.sort(compareMinX);
-           },
+         mode.newFeature = function (val) {
+           if (!arguments.length) return _newFeature;
+           _newFeature = val;
+           return mode;
+         };
 
-           // total margin of all possible split distributions where each node is at least m full
-           _allDistMargin: function (node, m, M, compare) {
+         mode.enter = function () {
+           var note = checkSelectedID();
+           if (!note) return;
 
-               node.children.sort(compare);
+           _behaviors.forEach(context.install);
 
-               var toBBox = this.toBBox,
-                   leftBBox = distBBox$1(node, 0, m, toBBox),
-                   rightBBox = distBBox$1(node, M - m, M, toBBox),
-                   margin = bboxMargin$1(leftBBox) + bboxMargin$1(rightBBox),
-                   i, child;
+           _keybinding.on(_t('inspector.zoom_to.key'), mode.zoomToSelected).on('⎋', esc, true);
 
-               for (i = m; i < M - m; i++) {
-                   child = node.children[i];
-                   extend$3(leftBBox, node.leaf ? toBBox(child) : child);
-                   margin += bboxMargin$1(leftBBox);
-               }
+           select(document).call(_keybinding);
+           selectNote();
+           var sidebar = context.ui().sidebar;
+           sidebar.show(_noteEditor.note(note).newNote(_newFeature)); // expand the sidebar, avoid obscuring the note if needed
 
-               for (i = M - m - 1; i >= m; i--) {
-                   child = node.children[i];
-                   extend$3(rightBBox, node.leaf ? toBBox(child) : child);
-                   margin += bboxMargin$1(rightBBox);
-               }
+           sidebar.expand(sidebar.intersects(note.extent()));
+           context.map().on('drawn.select', selectNote);
+         };
 
-               return margin;
-           },
+         mode.exit = function () {
+           _behaviors.forEach(context.uninstall);
 
-           _adjustParentBBoxes: function (bbox, path, level) {
-               // adjust bboxes along the given tree path
-               for (var i = level; i >= 0; i--) {
-                   extend$3(path[i], bbox);
-               }
-           },
+           select(document).call(_keybinding.unbind);
+           context.surface().selectAll('.layer-notes .selected').classed('selected hover', false);
+           context.map().on('drawn.select', null);
+           context.ui().sidebar.hide();
+           context.selectedNoteID(null);
+         };
 
-           _condense: function (path) {
-               // go through the path, removing empty nodes and updating bboxes
-               for (var i = path.length - 1, siblings; i >= 0; i--) {
-                   if (path[i].children.length === 0) {
-                       if (i > 0) {
-                           siblings = path[i - 1].children;
-                           siblings.splice(siblings.indexOf(path[i]), 1);
+         return mode;
+       }
 
-                       } else this.clear();
+       function modeDragNote(context) {
+         var mode = {
+           id: 'drag-note',
+           button: 'browse'
+         };
+         var edit = behaviorEdit(context);
 
-                   } else calcBBox$1(path[i], this.toBBox);
-               }
-           },
+         var _nudgeInterval;
 
-           _initFormat: function (format) {
-               // data format (minX, minY, maxX, maxY accessors)
+         var _lastLoc;
 
-               // uses eval-type function compilation instead of just accepting a toBBox function
-               // because the algorithms are very sensitive to sorting functions performance,
-               // so they should be dead simple and without inner calls
+         var _note; // most current note.. dragged note may have stale datum.
 
-               var compareArr = ['return a', ' - b', ';'];
 
-               this.compareMinX = new Function('a', 'b', compareArr.join(format[0]));
-               this.compareMinY = new Function('a', 'b', compareArr.join(format[1]));
+         function startNudge(d3_event, nudge) {
+           if (_nudgeInterval) window.clearInterval(_nudgeInterval);
+           _nudgeInterval = window.setInterval(function () {
+             context.map().pan(nudge);
+             doMove(d3_event, nudge);
+           }, 50);
+         }
 
-               this.toBBox = new Function('a',
-                   'return {minX: a' + format[0] +
-                   ', minY: a' + format[1] +
-                   ', maxX: a' + format[2] +
-                   ', maxY: a' + format[3] + '};');
+         function stopNudge() {
+           if (_nudgeInterval) {
+             window.clearInterval(_nudgeInterval);
+             _nudgeInterval = null;
            }
-       };
+         }
 
-       function findItem$1(item, items, equalsFn) {
-           if (!equalsFn) return items.indexOf(item);
+         function origin(note) {
+           return context.projection(note.loc);
+         }
+
+         function start(d3_event, note) {
+           _note = note;
+           var osm = services.osm;
 
-           for (var i = 0; i < items.length; i++) {
-               if (equalsFn(item, items[i])) return i;
+           if (osm) {
+             // Get latest note from cache.. The marker may have a stale datum bound to it
+             // and dragging it around can sometimes delete the users note comment.
+             _note = osm.getNote(_note.id);
            }
-           return -1;
-       }
 
-       // calculate node's bbox from bboxes of its children
-       function calcBBox$1(node, toBBox) {
-           distBBox$1(node, 0, node.children.length, toBBox, node);
-       }
+           context.surface().selectAll('.note-' + _note.id).classed('active', true);
+           context.perform(actionNoop());
+           context.enter(mode);
+           context.selectedNoteID(_note.id);
+         }
 
-       // min bounding rectangle of node children from k to p-1
-       function distBBox$1(node, k, p, toBBox, destNode) {
-           if (!destNode) destNode = createNode$1(null);
-           destNode.minX = Infinity;
-           destNode.minY = Infinity;
-           destNode.maxX = -Infinity;
-           destNode.maxY = -Infinity;
+         function move(d3_event, entity, point) {
+           d3_event.stopPropagation();
+           _lastLoc = context.projection.invert(point);
+           doMove(d3_event);
+           var nudge = geoViewportEdge(point, context.map().dimensions());
 
-           for (var i = k, child; i < p; i++) {
-               child = node.children[i];
-               extend$3(destNode, node.leaf ? toBBox(child) : child);
+           if (nudge) {
+             startNudge(d3_event, nudge);
+           } else {
+             stopNudge();
            }
+         }
 
-           return destNode;
-       }
-
-       function extend$3(a, b) {
-           a.minX = Math.min(a.minX, b.minX);
-           a.minY = Math.min(a.minY, b.minY);
-           a.maxX = Math.max(a.maxX, b.maxX);
-           a.maxY = Math.max(a.maxY, b.maxY);
-           return a;
-       }
+         function doMove(d3_event, nudge) {
+           nudge = nudge || [0, 0];
+           var currPoint = d3_event && d3_event.point || context.projection(_lastLoc);
+           var currMouse = geoVecSubtract(currPoint, nudge);
+           var loc = context.projection.invert(currMouse);
+           _note = _note.move(loc);
+           var osm = services.osm;
 
-       function compareNodeMinX$1(a, b) { return a.minX - b.minX; }
-       function compareNodeMinY$1(a, b) { return a.minY - b.minY; }
+           if (osm) {
+             osm.replaceNote(_note); // update note cache
+           }
 
-       function bboxArea$1(a)   { return (a.maxX - a.minX) * (a.maxY - a.minY); }
-       function bboxMargin$1(a) { return (a.maxX - a.minX) + (a.maxY - a.minY); }
+           context.replace(actionNoop()); // trigger redraw
+         }
 
-       function enlargedArea$1(a, b) {
-           return (Math.max(b.maxX, a.maxX) - Math.min(b.minX, a.minX)) *
-                  (Math.max(b.maxY, a.maxY) - Math.min(b.minY, a.minY));
-       }
+         function end() {
+           context.replace(actionNoop()); // trigger redraw
 
-       function intersectionArea$1(a, b) {
-           var minX = Math.max(a.minX, b.minX),
-               minY = Math.max(a.minY, b.minY),
-               maxX = Math.min(a.maxX, b.maxX),
-               maxY = Math.min(a.maxY, b.maxY);
+           context.selectedNoteID(_note.id).enter(modeSelectNote(context, _note.id));
+         }
 
-           return Math.max(0, maxX - minX) *
-                  Math.max(0, maxY - minY);
-       }
+         var drag = behaviorDrag().selector('.layer-touch.markers .target.note.new').surface(context.container().select('.main-map').node()).origin(origin).on('start', start).on('move', move).on('end', end);
 
-       function contains$2(a, b) {
-           return a.minX <= b.minX &&
-                  a.minY <= b.minY &&
-                  b.maxX <= a.maxX &&
-                  b.maxY <= a.maxY;
-       }
+         mode.enter = function () {
+           context.install(edit);
+         };
 
-       function intersects$1(a, b) {
-           return b.minX <= a.maxX &&
-                  b.minY <= a.maxY &&
-                  b.maxX >= a.minX &&
-                  b.maxY >= a.minY;
-       }
+         mode.exit = function () {
+           context.ui().sidebar.hover.cancel();
+           context.uninstall(edit);
+           context.surface().selectAll('.active').classed('active', false);
+           stopNudge();
+         };
 
-       function createNode$1(children) {
-           return {
-               children: children,
-               height: 1,
-               leaf: true,
-               minX: Infinity,
-               minY: Infinity,
-               maxX: -Infinity,
-               maxY: -Infinity
-           };
+         mode.behavior = drag;
+         return mode;
        }
 
-       // sort an array so that items come in groups of n unsorted items, with groups sorted between each other;
-       // combines selection algorithm with binary divide & conquer approach
+       function uiDataHeader() {
+         var _datum;
 
-       function multiSelect$1(arr, left, right, n, compare) {
-           var stack = [left, right],
-               mid;
+         function dataHeader(selection) {
+           var header = selection.selectAll('.data-header').data(_datum ? [_datum] : [], function (d) {
+             return d.__featurehash__;
+           });
+           header.exit().remove();
+           var headerEnter = header.enter().append('div').attr('class', 'data-header');
+           var iconEnter = headerEnter.append('div').attr('class', 'data-header-icon');
+           iconEnter.append('div').attr('class', 'preset-icon-28').call(svgIcon('#iD-icon-data', 'note-fill'));
+           headerEnter.append('div').attr('class', 'data-header-label').html(_t.html('map_data.layers.custom.title'));
+         }
 
-           while (stack.length) {
-               right = stack.pop();
-               left = stack.pop();
+         dataHeader.datum = function (val) {
+           if (!arguments.length) return _datum;
+           _datum = val;
+           return this;
+         };
 
-               if (right - left <= n) continue;
+         return dataHeader;
+       }
 
-               mid = left + Math.ceil((right - left) / n / 2) * n;
-               quickselect$1(arr, mid, left, right, compare);
+       // It is keyed on the `value` of the entry. Data should be an array of objects like:
+       //   [{
+       //       value:   'string value',  // required
+       //       display: 'label html'     // optional
+       //       title:   'hover text'     // optional
+       //       terms:   ['search terms'] // optional
+       //   }, ...]
 
-               stack.push(left, mid, mid, right);
-           }
-       }
-       rbush_1.default = _default$2;
+       var _comboHideTimerID;
 
-       var lineclip_1$1 = lineclip$1;
+       function uiCombobox(context, klass) {
+         var dispatch$1 = dispatch('accept', 'cancel');
+         var container = context.container();
+         var _suggestions = [];
+         var _data = [];
+         var _fetched = {};
+         var _selected = null;
+         var _canAutocomplete = true;
+         var _caseSensitive = false;
+         var _cancelFetch = false;
+         var _minItems = 2;
+         var _tDown = 0;
+
+         var _mouseEnterHandler, _mouseLeaveHandler;
+
+         var _fetcher = function _fetcher(val, cb) {
+           cb(_data.filter(function (d) {
+             var terms = d.terms || [];
+             terms.push(d.value);
+             return terms.some(function (term) {
+               return term.toString().toLowerCase().indexOf(val.toLowerCase()) !== -1;
+             });
+           }));
+         };
 
-       lineclip$1.polyline = lineclip$1;
-       lineclip$1.polygon = polygonclip$1;
+         var combobox = function combobox(input, attachTo) {
+           if (!input || input.empty()) return;
+           input.classed('combobox-input', true).on('focus.combo-input', focus).on('blur.combo-input', blur).on('keydown.combo-input', keydown).on('keyup.combo-input', keyup).on('input.combo-input', change).on('mousedown.combo-input', mousedown).each(function () {
+             var parent = this.parentNode;
+             var sibling = this.nextSibling;
+             select(parent).selectAll('.combobox-caret').filter(function (d) {
+               return d === input.node();
+             }).data([input.node()]).enter().insert('div', function () {
+               return sibling;
+             }).attr('class', 'combobox-caret').on('mousedown.combo-caret', function (d3_event) {
+               d3_event.preventDefault(); // don't steal focus from input
 
+               input.node().focus(); // focus the input as if it was clicked
 
-       // Cohen-Sutherland line clippign algorithm, adapted to efficiently
-       // handle polylines rather than just segments
+               mousedown(d3_event);
+             }).on('mouseup.combo-caret', function (d3_event) {
+               d3_event.preventDefault(); // don't steal focus from input
 
-       function lineclip$1(points, bbox, result) {
+               mouseup(d3_event);
+             });
+           });
 
-           var len = points.length,
-               codeA = bitCode$1(points[0], bbox),
-               part = [],
-               i, a, b, codeB, lastCode;
+           function mousedown(d3_event) {
+             if (d3_event.button !== 0) return; // left click only
 
-           if (!result) result = [];
+             _tDown = +new Date(); // clear selection
 
-           for (i = 1; i < len; i++) {
-               a = points[i - 1];
-               b = points[i];
-               codeB = lastCode = bitCode$1(b, bbox);
+             var start = input.property('selectionStart');
+             var end = input.property('selectionEnd');
 
-               while (true) {
+             if (start !== end) {
+               var val = utilGetSetValue(input);
+               input.node().setSelectionRange(val.length, val.length);
+               return;
+             }
 
-                   if (!(codeA | codeB)) { // accept
-                       part.push(a);
+             input.on('mouseup.combo-input', mouseup);
+           }
 
-                       if (codeB !== lastCode) { // segment went outside
-                           part.push(b);
+           function mouseup(d3_event) {
+             input.on('mouseup.combo-input', null);
+             if (d3_event.button !== 0) return; // left click only
 
-                           if (i < len - 1) { // start a new line
-                               result.push(part);
-                               part = [];
-                           }
-                       } else if (i === len - 1) {
-                           part.push(b);
-                       }
-                       break;
+             if (input.node() !== document.activeElement) return; // exit if this input is not focused
 
-                   } else if (codeA & codeB) { // trivial reject
-                       break;
+             var start = input.property('selectionStart');
+             var end = input.property('selectionEnd');
+             if (start !== end) return; // exit if user is selecting
+             // not showing or showing for a different field - try to show it.
 
-                   } else if (codeA) { // a outside, intersect with clip edge
-                       a = intersect$1(a, b, codeA, bbox);
-                       codeA = bitCode$1(a, bbox);
+             var combo = container.selectAll('.combobox');
 
-                   } else { // b outside
-                       b = intersect$1(a, b, codeB, bbox);
-                       codeB = bitCode$1(b, bbox);
-                   }
-               }
+             if (combo.empty() || combo.datum() !== input.node()) {
+               var tOrig = _tDown;
+               window.setTimeout(function () {
+                 if (tOrig !== _tDown) return; // exit if user double clicked
 
-               codeA = lastCode;
+                 fetchComboData('', function () {
+                   show();
+                   render();
+                 });
+               }, 250);
+             } else {
+               hide();
+             }
            }
 
-           if (part.length) result.push(part);
+           function focus() {
+             fetchComboData(''); // prefetch values (may warm taginfo cache)
+           }
 
-           return result;
-       }
+           function blur() {
+             _comboHideTimerID = window.setTimeout(hide, 75);
+           }
 
-       // Sutherland-Hodgeman polygon clipping algorithm
+           function show() {
+             hide(); // remove any existing
 
-       function polygonclip$1(points, bbox) {
+             container.insert('div', ':first-child').datum(input.node()).attr('class', 'combobox' + (klass ? ' combobox-' + klass : '')).style('position', 'absolute').style('display', 'block').style('left', '0px').on('mousedown.combo-container', function (d3_event) {
+               // prevent moving focus out of the input field
+               d3_event.preventDefault();
+             });
+             container.on('scroll.combo-scroll', render, true);
+           }
 
-           var result, edge, prev, prevInside, i, p, inside;
+           function hide() {
+             if (_comboHideTimerID) {
+               window.clearTimeout(_comboHideTimerID);
+               _comboHideTimerID = undefined;
+             }
 
-           // clip against each side of the clip rectangle
-           for (edge = 1; edge <= 8; edge *= 2) {
-               result = [];
-               prev = points[points.length - 1];
-               prevInside = !(bitCode$1(prev, bbox) & edge);
+             container.selectAll('.combobox').remove();
+             container.on('scroll.combo-scroll', null);
+           }
 
-               for (i = 0; i < points.length; i++) {
-                   p = points[i];
-                   inside = !(bitCode$1(p, bbox) & edge);
+           function keydown(d3_event) {
+             var shown = !container.selectAll('.combobox').empty();
+             var tagName = input.node() ? input.node().tagName.toLowerCase() : '';
 
-                   // if segment goes through the clip window, add an intersection
-                   if (inside !== prevInside) result.push(intersect$1(prev, p, edge, bbox));
+             switch (d3_event.keyCode) {
+               case 8: // ⌫ Backspace
 
-                   if (inside) result.push(p); // add a point if it's inside
+               case 46:
+                 // ⌦ Delete
+                 d3_event.stopPropagation();
+                 _selected = null;
+                 render();
+                 input.on('input.combo-input', function () {
+                   var start = input.property('selectionStart');
+                   input.node().setSelectionRange(start, start);
+                   input.on('input.combo-input', change);
+                 });
+                 break;
 
-                   prev = p;
-                   prevInside = inside;
-               }
+               case 9:
+                 // ⇥ Tab
+                 accept();
+                 break;
 
-               points = result;
+               case 13:
+                 // ↩ Return
+                 d3_event.preventDefault();
+                 d3_event.stopPropagation();
+                 break;
 
-               if (!points.length) break;
-           }
+               case 38:
+                 // ↑ Up arrow
+                 if (tagName === 'textarea' && !shown) return;
+                 d3_event.preventDefault();
 
-           return result;
-       }
+                 if (tagName === 'input' && !shown) {
+                   show();
+                 }
 
-       // intersect a segment against one of the 4 lines that make up the bbox
+                 nav(-1);
+                 break;
 
-       function intersect$1(a, b, edge, bbox) {
-           return edge & 8 ? [a[0] + (b[0] - a[0]) * (bbox[3] - a[1]) / (b[1] - a[1]), bbox[3]] : // top
-                  edge & 4 ? [a[0] + (b[0] - a[0]) * (bbox[1] - a[1]) / (b[1] - a[1]), bbox[1]] : // bottom
-                  edge & 2 ? [bbox[2], a[1] + (b[1] - a[1]) * (bbox[2] - a[0]) / (b[0] - a[0])] : // right
-                  edge & 1 ? [bbox[0], a[1] + (b[1] - a[1]) * (bbox[0] - a[0]) / (b[0] - a[0])] : // left
-                  null;
-       }
+               case 40:
+                 // ↓ Down arrow
+                 if (tagName === 'textarea' && !shown) return;
+                 d3_event.preventDefault();
 
-       // bit code reflects the point position relative to the bbox:
+                 if (tagName === 'input' && !shown) {
+                   show();
+                 }
 
-       //         left  mid  right
-       //    top  1001  1000  1010
-       //    mid  0001  0000  0010
-       // bottom  0101  0100  0110
+                 nav(+1);
+                 break;
+             }
+           }
 
-       function bitCode$1(p, bbox) {
-           var code = 0;
+           function keyup(d3_event) {
+             switch (d3_event.keyCode) {
+               case 27:
+                 // ⎋ Escape
+                 cancel();
+                 break;
 
-           if (p[0] < bbox[0]) code |= 1; // left
-           else if (p[0] > bbox[2]) code |= 2; // right
+               case 13:
+                 // ↩ Return
+                 accept();
+                 break;
+             }
+           } // Called whenever the input value is changed (e.g. on typing)
 
-           if (p[1] < bbox[1]) code |= 4; // bottom
-           else if (p[1] > bbox[3]) code |= 8; // top
 
-           return code;
-       }
+           function change() {
+             fetchComboData(value(), function () {
+               _selected = null;
+               var val = input.property('value');
 
-       var whichPolygon_1 = whichPolygon;
+               if (_suggestions.length) {
+                 if (input.property('selectionEnd') === val.length) {
+                   _selected = tryAutocomplete();
+                 }
 
-       function whichPolygon(data) {
-           var bboxes = [];
-           for (var i = 0; i < data.features.length; i++) {
-               var feature = data.features[i];
-               var coords = feature.geometry.coordinates;
+                 if (!_selected) {
+                   _selected = val;
+                 }
+               }
 
-               if (feature.geometry.type === 'Polygon') {
-                   bboxes.push(treeItem(coords, feature.properties));
+               if (val.length) {
+                 var combo = container.selectAll('.combobox');
 
-               } else if (feature.geometry.type === 'MultiPolygon') {
-                   for (var j = 0; j < coords.length; j++) {
-                       bboxes.push(treeItem(coords[j], feature.properties));
-                   }
+                 if (combo.empty()) {
+                   show();
+                 }
+               } else {
+                 hide();
                }
-           }
 
-           var tree = rbush_1().load(bboxes);
+               render();
+             });
+           } // Called when the user presses up/down arrows to navigate the list
 
-           function query(p, multi) {
-               var output = [],
-                   result = tree.search({
-                       minX: p[0],
-                       minY: p[1],
-                       maxX: p[0],
-                       maxY: p[1]
-                   });
-               for (var i = 0; i < result.length; i++) {
-                   if (insidePolygon(result[i].coords, p)) {
-                       if (multi)
-                           output.push(result[i].props);
-                       else
-                           return result[i].props;
-                   }
-               }
-               return multi && output.length ? output : null;
-           }
 
-           query.tree = tree;
-           query.bbox = function queryBBox(bbox) {
-               var output = [];
-               var result = tree.search({
-                   minX: bbox[0],
-                   minY: bbox[1],
-                   maxX: bbox[2],
-                   maxY: bbox[3]
-               });
-               for (var i = 0; i < result.length; i++) {
-                   if (polygonIntersectsBBox(result[i].coords, bbox)) {
-                       output.push(result[i].props);
-                   }
-               }
-               return output;
-           };
+           function nav(dir) {
+             if (_suggestions.length) {
+               // try to determine previously selected index..
+               var index = -1;
 
-           return query;
-       }
+               for (var i = 0; i < _suggestions.length; i++) {
+                 if (_selected && _suggestions[i].value === _selected) {
+                   index = i;
+                   break;
+                 }
+               } // pick new _selected
 
-       function polygonIntersectsBBox(polygon, bbox) {
-           var bboxCenter = [
-               (bbox[0] + bbox[2]) / 2,
-               (bbox[1] + bbox[3]) / 2
-           ];
-           if (insidePolygon(polygon, bboxCenter)) return true;
-           for (var i = 0; i < polygon.length; i++) {
-               if (lineclip_1$1(polygon[i], bbox).length > 0) return true;
-           }
-           return false;
-       }
 
-       // ray casting algorithm for detecting if point is in polygon
-       function insidePolygon(rings, p) {
-           var inside = false;
-           for (var i = 0, len = rings.length; i < len; i++) {
-               var ring = rings[i];
-               for (var j = 0, len2 = ring.length, k = len2 - 1; j < len2; k = j++) {
-                   if (rayIntersect(p, ring[j], ring[k])) inside = !inside;
-               }
+               index = Math.max(Math.min(index + dir, _suggestions.length - 1), 0);
+               _selected = _suggestions[index].value;
+               input.property('value', _selected);
+             }
+
+             render();
+             ensureVisible();
            }
-           return inside;
-       }
 
-       function rayIntersect(p, p1, p2) {
-           return ((p1[1] > p[1]) !== (p2[1] > p[1])) && (p[0] < (p2[0] - p1[0]) * (p[1] - p1[1]) / (p2[1] - p1[1]) + p1[0]);
-       }
+           function ensureVisible() {
+             var combo = container.selectAll('.combobox');
+             if (combo.empty()) return;
+             var containerRect = container.node().getBoundingClientRect();
+             var comboRect = combo.node().getBoundingClientRect();
 
-       function treeItem(coords, props) {
-           var item = {
-               minX: Infinity,
-               minY: Infinity,
-               maxX: -Infinity,
-               maxY: -Infinity,
-               coords: coords,
-               props: props
-           };
+             if (comboRect.bottom > containerRect.bottom) {
+               var node = attachTo ? attachTo.node() : input.node();
+               node.scrollIntoView({
+                 behavior: 'instant',
+                 block: 'center'
+               });
+               render();
+             } // https://stackoverflow.com/questions/11039885/scrollintoview-causing-the-whole-page-to-move
 
-           for (var i = 0; i < coords[0].length; i++) {
-               var p = coords[0][i];
-               item.minX = Math.min(item.minX, p[0]);
-               item.minY = Math.min(item.minY, p[1]);
-               item.maxX = Math.max(item.maxX, p[0]);
-               item.maxY = Math.max(item.maxY, p[1]);
-           }
-           return item;
-       }
 
-       var type = "FeatureCollection";
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-       var rawBorders = {
-       type: type,
-       features: features
-       };
+             var selected = combo.selectAll('.combobox-option.selected').node();
 
-       let borders = rawBorders;
-       let whichPolygonGetter = {};
-       let featuresByCode = {};
-       let idFilterRegex = /\bThe\b|\bthe\b|\band\b|\bof\b|[-_ .,()&[\]/]/g;
-       let levels = [
-         'subterritory',
-         'territory',
-         'country',
-         'intermediateRegion',
-         'subregion',
-         'region',
-         'union',
-         'world'
-       ];
-       loadDerivedDataAndCaches(borders);
-       function loadDerivedDataAndCaches(borders) {
-         let identifierProps = ['iso1A2', 'iso1A3', 'm49', 'wikidata', 'emojiFlag', 'nameEn'];
-         let geometryFeatures = [];
-         for (let i in borders.features) {
-           let feature = borders.features[i];
-           feature.properties.id = feature.properties.iso1A2 || feature.properties.m49;
-           loadM49(feature);
-           loadIsoStatus(feature);
-           loadLevel(feature);
-           loadGroups(feature);
-           loadRoadSpeedUnit(feature);
-           loadDriveSide(feature);
-           loadFlag(feature);
-           cacheFeatureByIDs(feature);
-           if (feature.geometry) geometryFeatures.push(feature);
-         }
-         for (let i in borders.features) {
-           let feature = borders.features[i];
-           feature.properties.groups.sort(function(groupID1, groupID2) {
-             return (
-               levels.indexOf(featuresByCode[groupID1].properties.level) -
-               levels.indexOf(featuresByCode[groupID2].properties.level)
-             );
-           });
-           loadMembersForGroupsOf(feature);
-         }
-         let geometryOnlyCollection = {
-           type: 'RegionFeatureCollection',
-           features: geometryFeatures
-         };
-         whichPolygonGetter = whichPolygon_1(geometryOnlyCollection);
-         function loadGroups(feature) {
-           let props = feature.properties;
-           if (!props.groups) {
-             props.groups = [];
-           }
-           if (props.country) {
-             props.groups.push(props.country);
-           }
-           if (props.m49 !== '001') {
-             props.groups.push('001');
-           }
-         }
-         function loadM49(feature) {
-           let props = feature.properties;
-           if (!props.m49 && props.iso1N3) {
-             props.m49 = props.iso1N3;
-           }
-         }
-         function loadIsoStatus(feature) {
-           let props = feature.properties;
-           if (!props.isoStatus && props.iso1A2) {
-             props.isoStatus = 'official';
-           }
-         }
-         function loadLevel(feature) {
-           let props = feature.properties;
-           if (props.level) return;
-           if (!props.country) {
-             props.level = 'country';
-           } else if (props.isoStatus === 'official') {
-             props.level = 'territory';
-           } else {
-             props.level = 'subterritory';
-           }
-         }
-         function loadRoadSpeedUnit(feature) {
-           let props = feature.properties;
-           if (props.roadSpeedUnit === undefined && props.iso1A2 && props.iso1A2 !== 'EU') {
-             props.roadSpeedUnit = 'km/h';
-           }
-         }
-         function loadDriveSide(feature) {
-           let props = feature.properties;
-           if (props.driveSide === undefined && props.iso1A2 && props.iso1A2 !== 'EU') {
-             props.driveSide = 'right';
-           }
-         }
-         function loadFlag(feature) {
-           if (!feature.properties.iso1A2) return;
-           let flag = feature.properties.iso1A2.replace(/./g, function(char) {
-             return String.fromCodePoint(char.charCodeAt(0) + 127397);
-           });
-           feature.properties.emojiFlag = flag;
-         }
-         function loadMembersForGroupsOf(feature) {
-           let featureID = feature.properties.id;
-           let standardizedGroupIDs = [];
-           for (let j in feature.properties.groups) {
-             let groupID = feature.properties.groups[j];
-             let groupFeature = featuresByCode[groupID];
-             standardizedGroupIDs.push(groupFeature.properties.id);
-             if (groupFeature.properties.members) {
-               groupFeature.properties.members.push(featureID);
-             } else {
-               groupFeature.properties.members = [featureID];
-             }
-           }
-           feature.properties.groups = standardizedGroupIDs;
-         }
-         function cacheFeatureByIDs(feature) {
-           for (let k in identifierProps) {
-             let prop = identifierProps[k];
-             let id = prop && feature.properties[prop];
-             if (id) {
-               id = id.replace(idFilterRegex, '').toUpperCase();
-               featuresByCode[id] = feature;
-             }
-           }
-           if (feature.properties.aliases) {
-             for (let j in feature.properties.aliases) {
-               let alias = feature.properties.aliases[j].replace(idFilterRegex, '').toUpperCase();
-               featuresByCode[alias] = feature;
-             }
-           }
-         }
-       }
-       function locArray(loc) {
-         if (Array.isArray(loc)) {
-           return loc;
-         } else if (loc.coordinates) {
-           return loc.coordinates;
-         }
-         return loc.geometry.coordinates;
-       }
-       function smallestFeature(loc) {
-         let query = locArray(loc);
-         let featureProperties = whichPolygonGetter(query);
-         if (!featureProperties) return null;
-         return featuresByCode[featureProperties.id];
-       }
-       function countryFeature(loc) {
-         let feature = smallestFeature(loc);
-         if (!feature) return null;
-         let countryCode = feature.properties.country || feature.properties.iso1A2;
-         return featuresByCode[countryCode];
-       }
-       function featureForLoc(loc, opts) {
-         if (opts && opts.level && opts.level !== 'country') {
-           let features = featuresContaining(loc);
-           let targetLevel = opts.level;
-           let targetLevelIndex = levels.indexOf(targetLevel);
-           if (targetLevelIndex === -1) return null;
-           for (let i in features) {
-             let feature = features[i];
-             if (
-               feature.properties.level === targetLevel ||
-               levels.indexOf(feature.properties.level) > targetLevelIndex
-             ) {
-               return feature;
+             if (selected) {
+               selected.scrollIntoView({
+                 behavior: 'smooth',
+                 block: 'nearest'
+               });
              }
            }
-           return null;
-         }
-         return countryFeature(loc);
-       }
-       function featureForID(id) {
-         let stringID;
-         if (typeof id === 'number') {
-           stringID = id.toString();
-           if (stringID.length === 1) {
-             stringID = '00' + stringID;
-           } else if (stringID.length === 2) {
-             stringID = '0' + stringID;
-           }
-         } else {
-           stringID = id.replace(idFilterRegex, '').toUpperCase();
-         }
-         return featuresByCode[stringID] || null;
-       }
-       function smallestOrMatchingFeature(query) {
-         if (typeof query === 'object') {
-           return smallestFeature(query);
-         }
-         return featureForID(query);
-       }
-       function feature(query, opts) {
-         if (typeof query === 'object') {
-           return featureForLoc(query, opts);
-         }
-         return featureForID(query);
-       }
-       function iso1A2Code(query, opts) {
-         let match = feature(query, opts);
-         if (!match) return null;
-         return match.properties.iso1A2 || null;
-       }
-       function featuresContaining(query, strict) {
-         let feature = smallestOrMatchingFeature(query);
-         if (!feature) return [];
-         let features = [];
-         if (!strict || typeof query === 'object') {
-           features.push(feature);
-         }
-         let properties = feature.properties;
-         for (let i in properties.groups) {
-           let groupID = properties.groups[i];
-           features.push(featuresByCode[groupID]);
-         }
-         return features;
-       }
-       function roadSpeedUnit(query) {
-         let feature = smallestOrMatchingFeature(query);
-         return (feature && feature.properties.roadSpeedUnit) || null;
-       }
 
-       let _dataDeprecated;
-       let _nsi;
+           function value() {
+             var value = input.property('value');
+             var start = input.property('selectionStart');
+             var end = input.property('selectionEnd');
 
-       function validationOutdatedTags() {
-         const type = 'outdated_tags';
-         const nsiKeys = ['amenity', 'shop', 'tourism', 'leisure', 'office'];
+             if (start && end) {
+               value = value.substring(0, start);
+             }
 
-         // A concern here in switching to async data means that `_dataDeprecated`
-         // and `_nsi` will not be available at first, so the data on early tiles
-         // may not have tags validated fully.
+             return value;
+           }
 
-         // initialize deprecated tags array
-         _mainFileFetcher.get('deprecated')
-           .then(d => _dataDeprecated = d)
-           .catch(() => { /* ignore */ });
-
-         _mainFileFetcher.get('nsi_brands')
-           .then(d => {
-             _nsi = {
-               brands: d.brands,
-               matcher: matcher$1(),
-               wikidata: {},
-               wikipedia: {}
-             };
+           function fetchComboData(v, cb) {
+             _cancelFetch = false;
 
-             // initialize name-suggestion-index matcher
-             _nsi.matcher.buildMatchIndex(d.brands);
+             _fetcher.call(input, v, function (results) {
+               // already chose a value, don't overwrite or autocomplete it
+               if (_cancelFetch) return;
+               _suggestions = results;
+               results.forEach(function (d) {
+                 _fetched[d.value] = d;
+               });
 
-             // index all known wikipedia and wikidata tags
-             Object.keys(d.brands).forEach(kvnd => {
-               const brand = d.brands[kvnd];
-               const wd = brand.tags['brand:wikidata'];
-               const wp = brand.tags['brand:wikipedia'];
-               if (wd) { _nsi.wikidata[wd] = kvnd; }
-               if (wp) { _nsi.wikipedia[wp] = kvnd; }
+               if (cb) {
+                 cb();
+               }
              });
+           }
 
-             return _nsi;
-           })
-           .catch(() => { /* ignore */ });
-
+           function tryAutocomplete() {
+             if (!_canAutocomplete) return;
+             var val = _caseSensitive ? value() : value().toLowerCase();
+             if (!val) return; // Don't autocomplete if user is typing a number - #4935
 
-         function oldTagIssues(entity, graph) {
-           const oldTags = Object.assign({}, entity.tags);  // shallow copy
-           let preset = _mainPresetIndex.match(entity, graph);
-           let subtype = 'deprecated_tags';
-           if (!preset) return [];
+             if (!isNaN(parseFloat(val)) && isFinite(val)) return;
+             var bestIndex = -1;
 
-           // upgrade preset..
-           if (preset.replacement) {
-             const newPreset = _mainPresetIndex.item(preset.replacement);
-             graph = actionChangePreset(entity.id, preset, newPreset, true /* skip field defaults */)(graph);
-             entity = graph.entity(entity.id);
-             preset = newPreset;
-           }
+             for (var i = 0; i < _suggestions.length; i++) {
+               var suggestion = _suggestions[i].value;
+               var compare = _caseSensitive ? suggestion : suggestion.toLowerCase(); // if search string matches suggestion exactly, pick it..
 
-           // upgrade tags..
-           if (_dataDeprecated) {
-             const deprecatedTags = entity.deprecatedTags(_dataDeprecated);
-             if (deprecatedTags.length) {
-               deprecatedTags.forEach(tag => {
-                 graph = actionUpgradeTags(entity.id, tag.old, tag.replace)(graph);
-               });
-               entity = graph.entity(entity.id);
+               if (compare === val) {
+                 bestIndex = i;
+                 break; // otherwise lock in the first result that starts with the search string..
+               } else if (bestIndex === -1 && compare.indexOf(val) === 0) {
+                 bestIndex = i;
+               }
              }
-           }
 
-           // add missing addTags..
-           let newTags = Object.assign({}, entity.tags);  // shallow copy
-           if (preset.tags !== preset.addTags) {
-             Object.keys(preset.addTags).forEach(k => {
-               if (!newTags[k]) {
-                 if (preset.addTags[k] === '*') {
-                   newTags[k] = 'yes';
-                 } else {
-                   newTags[k] = preset.addTags[k];
-                 }
-               }
-             });
+             if (bestIndex !== -1) {
+               var bestVal = _suggestions[bestIndex].value;
+               input.property('value', bestVal);
+               input.node().setSelectionRange(val.length, bestVal.length);
+               return bestVal;
+             }
            }
 
-           if (_nsi) {
-             // Do `wikidata` or `wikipedia` identify this entity as a brand?  #6416
-             // If so, these tags can be swapped to `brand:wikidata`/`brand:wikipedia`
-             let isBrand;
-             if (newTags.wikidata) {                 // try matching `wikidata`
-               isBrand = _nsi.wikidata[newTags.wikidata];
-             }
-             if (!isBrand && newTags.wikipedia) {    // fallback to `wikipedia`
-               isBrand = _nsi.wikipedia[newTags.wikipedia];
-             }
-             if (isBrand && !newTags.office) {       // but avoid doing this for corporate offices
-               if (newTags.wikidata) {
-                 newTags['brand:wikidata'] = newTags.wikidata;
-                 delete newTags.wikidata;
-               }
-               if (newTags.wikipedia) {
-                 newTags['brand:wikipedia'] = newTags.wikipedia;
-                 delete newTags.wikipedia;
-               }
-               // I considered setting `name` and other tags here, but they aren't unique per wikidata
-               // (Q2759586 -> in USA "Papa John's", in Russia "Папа Джонс")
-               // So users will really need to use a preset or assign `name` themselves.
+           function render() {
+             if (_suggestions.length < _minItems || document.activeElement !== input.node()) {
+               hide();
+               return;
              }
 
-             // try key/value|name match against name-suggestion-index
-             if (newTags.name) {
-               for (let i = 0; i < nsiKeys.length; i++) {
-                 const k = nsiKeys[i];
-                 if (!newTags[k]) continue;
-
-                 const center = entity.extent(graph).center();
-                 const countryCode = iso1A2Code(center);
-                 const match = _nsi.matcher.matchKVN(k, newTags[k], newTags.name, countryCode && countryCode.toLowerCase());
-                 if (!match) continue;
-
-                 // for now skip ambiguous matches (like Target~(USA) vs Target~(Australia))
-                 if (match.d) continue;
+             var shown = !container.selectAll('.combobox').empty();
+             if (!shown) return;
+             var combo = container.selectAll('.combobox');
+             var options = combo.selectAll('.combobox-option').data(_suggestions, function (d) {
+               return d.value;
+             });
+             options.exit().remove(); // enter/update
 
-                 const brand = _nsi.brands[match.kvnd];
-                 if (brand && brand.tags['brand:wikidata'] &&
-                   brand.tags['brand:wikidata'] !== entity.tags['not:brand:wikidata']) {
-                   subtype = 'noncanonical_brand';
+             options.enter().append('a').attr('class', 'combobox-option').attr('title', function (d) {
+               return d.title;
+             }).html(function (d) {
+               return d.display || d.value;
+             }).on('mouseenter', _mouseEnterHandler).on('mouseleave', _mouseLeaveHandler).merge(options).classed('selected', function (d) {
+               return d.value === _selected;
+             }).on('click.combo-option', accept).order();
+             var node = attachTo ? attachTo.node() : input.node();
+             var containerRect = container.node().getBoundingClientRect();
+             var rect = node.getBoundingClientRect();
+             combo.style('left', rect.left + 5 - containerRect.left + 'px').style('width', rect.width - 10 + 'px').style('top', rect.height + rect.top - containerRect.top + 'px');
+           } // Dispatches an 'accept' event
+           // Then hides the combobox.
 
-                   const keepTags = ['takeaway'].reduce((acc, k) => {
-                     if (newTags[k]) {
-                       acc[k] = newTags[k];
-                     }
-                     return acc;
-                   }, {});
 
-                   nsiKeys.forEach(k => delete newTags[k]);
-                   Object.assign(newTags, brand.tags, keepTags);
-                   break;
-                 }
-               }
-             }
-           }
+           function accept(d3_event, d) {
+             _cancelFetch = true;
+             var thiz = input.node();
 
-           // determine diff
-           const tagDiff = utilTagDiff(oldTags, newTags);
-           if (!tagDiff.length) return [];
+             if (d) {
+               // user clicked on a suggestion
+               utilGetSetValue(input, d.value); // replace field contents
 
-           const isOnlyAddingTags = tagDiff.every(d => d.type === '+');
+               utilTriggerEvent(input, 'change');
+             } // clear (and keep) selection
 
-           let prefix = '';
-           if (subtype === 'noncanonical_brand') {
-             prefix = 'noncanonical_brand.';
-           } else if (subtype === 'deprecated_tags' && isOnlyAddingTags) {
-             subtype = 'incomplete_tags';
-             prefix = 'incomplete.';
-           }
 
-           // don't allow autofixing brand tags
-           let autoArgs = subtype !== 'noncanonical_brand' ? [doUpgrade, _t('issues.fix.upgrade_tags.annotation')] : null;
+             var val = utilGetSetValue(input);
+             thiz.setSelectionRange(val.length, val.length);
+             d = _fetched[val];
+             dispatch$1.call('accept', thiz, d, val);
+             hide();
+           } // Dispatches an 'cancel' event
+           // Then hides the combobox.
 
-           return [new validationIssue({
-             type: type,
-             subtype: subtype,
-             severity: 'warning',
-             message: showMessage,
-             reference: showReference,
-             entityIds: [entity.id],
-             hash: JSON.stringify(tagDiff),
-             dynamicFixes: () => {
-               return [
-                 new validationIssueFix({
-                   autoArgs: autoArgs,
-                   title: _t('issues.fix.upgrade_tags.title'),
-                   onClick: (context) => {
-                     context.perform(doUpgrade, _t('issues.fix.upgrade_tags.annotation'));
-                   }
-                 })
-               ];
-             }
-           })];
 
+           function cancel() {
+             _cancelFetch = true;
+             var thiz = input.node(); // clear (and remove) selection, and replace field contents
 
-           function doUpgrade(graph) {
-             const currEntity = graph.hasEntity(entity.id);
-             if (!currEntity) return graph;
+             var val = utilGetSetValue(input);
+             var start = input.property('selectionStart');
+             var end = input.property('selectionEnd');
+             val = val.slice(0, start) + val.slice(end);
+             utilGetSetValue(input, val);
+             thiz.setSelectionRange(val.length, val.length);
+             dispatch$1.call('cancel', thiz);
+             hide();
+           }
+         };
 
-             let newTags = Object.assign({}, currEntity.tags);  // shallow copy
-             tagDiff.forEach(diff => {
-               if (diff.type === '-') {
-                 delete newTags[diff.key];
-               } else if (diff.type === '+') {
-                 newTags[diff.key] = diff.newVal;
-               }
-             });
+         combobox.canAutocomplete = function (val) {
+           if (!arguments.length) return _canAutocomplete;
+           _canAutocomplete = val;
+           return combobox;
+         };
 
-             return actionChangeTags(currEntity.id, newTags)(graph);
-           }
+         combobox.caseSensitive = function (val) {
+           if (!arguments.length) return _caseSensitive;
+           _caseSensitive = val;
+           return combobox;
+         };
 
+         combobox.data = function (val) {
+           if (!arguments.length) return _data;
+           _data = val;
+           return combobox;
+         };
 
-           function showMessage(context) {
-             const currEntity = context.hasEntity(entity.id);
-             if (!currEntity) return '';
+         combobox.fetcher = function (val) {
+           if (!arguments.length) return _fetcher;
+           _fetcher = val;
+           return combobox;
+         };
 
-             let messageID = `issues.outdated_tags.${prefix}message`;
-             if (subtype === 'noncanonical_brand' && isOnlyAddingTags) {
-               messageID += '_incomplete';
-             }
-             return _t(messageID, { feature: utilDisplayLabel(currEntity, context.graph()) });
-           }
+         combobox.minItems = function (val) {
+           if (!arguments.length) return _minItems;
+           _minItems = val;
+           return combobox;
+         };
 
+         combobox.itemsMouseEnter = function (val) {
+           if (!arguments.length) return _mouseEnterHandler;
+           _mouseEnterHandler = val;
+           return combobox;
+         };
 
-           function showReference(selection) {
-             let enter = selection.selectAll('.issue-reference')
-               .data([0])
-               .enter();
-
-             enter
-               .append('div')
-               .attr('class', 'issue-reference')
-               .text(_t(`issues.outdated_tags.${prefix}reference`));
-
-             enter
-               .append('strong')
-               .text(_t('issues.suggested'));
-
-             enter
-               .append('table')
-               .attr('class', 'tagDiff-table')
-               .selectAll('.tagDiff-row')
-               .data(tagDiff)
-               .enter()
-               .append('tr')
-               .attr('class', 'tagDiff-row')
-               .append('td')
-               .attr('class', d => {
-                 let klass = d.type === '+' ? 'add' : 'remove';
-                 return `tagDiff-cell tagDiff-cell-${klass}`;
-               })
-               .text(d => d.display);
-           }
-         }
+         combobox.itemsMouseLeave = function (val) {
+           if (!arguments.length) return _mouseLeaveHandler;
+           _mouseLeaveHandler = val;
+           return combobox;
+         };
 
+         return utilRebind(combobox, dispatch$1, 'on');
+       }
 
-         function oldMultipolygonIssues(entity, graph) {
-           let multipolygon, outerWay;
-           if (entity.type === 'relation') {
-             outerWay = osmOldMultipolygonOuterMemberOfRelation(entity, graph);
-             multipolygon = entity;
-           } else if (entity.type === 'way') {
-             multipolygon = osmIsOldMultipolygonOuterMember(entity, graph);
-             outerWay = entity;
-           } else {
-             return [];
-           }
+       uiCombobox.off = function (input, context) {
+         input.on('focus.combo-input', null).on('blur.combo-input', null).on('keydown.combo-input', null).on('keyup.combo-input', null).on('input.combo-input', null).on('mousedown.combo-input', null).on('mouseup.combo-input', null);
+         context.container().on('scroll.combo-scroll', null);
+       };
 
-           if (!multipolygon || !outerWay) return [];
+       // hide class, which sets display=none, and a d3 transition for opacity.
+       // this will cause blinking when called repeatedly, so check that the
+       // value actually changes between calls.
 
-           return [new validationIssue({
-             type: type,
-             subtype: 'old_multipolygon',
-             severity: 'warning',
-             message: showMessage,
-             reference: showReference,
-             entityIds: [outerWay.id, multipolygon.id],
-             dynamicFixes: () => {
-               return [
-                 new validationIssueFix({
-                   autoArgs: [doUpgrade, _t('issues.fix.move_tags.annotation')],
-                   title: _t('issues.fix.move_tags.title'),
-                   onClick: (context) => {
-                     context.perform(doUpgrade, _t('issues.fix.move_tags.annotation'));
-                   }
-                 })
-               ];
-             }
-           })];
+       function uiToggle(show, callback) {
+         return function (selection) {
+           selection.style('opacity', show ? 0 : 1).classed('hide', false).transition().style('opacity', show ? 1 : 0).on('end', function () {
+             select(this).classed('hide', !show).style('opacity', null);
+             if (callback) callback.apply(this);
+           });
+         };
+       }
 
+       function uiDisclosure(context, key, expandedDefault) {
+         var dispatch$1 = dispatch('toggled');
 
-           function doUpgrade(graph) {
-             let currMultipolygon = graph.hasEntity(multipolygon.id);
-             let currOuterWay = graph.hasEntity(outerWay.id);
-             if (!currMultipolygon || !currOuterWay) return graph;
+         var _expanded;
 
-             currMultipolygon = currMultipolygon.mergeTags(currOuterWay.tags);
-             graph = graph.replace(currMultipolygon);
-             return actionChangeTags(currOuterWay.id, {})(graph);
+         var _label = utilFunctor('');
+
+         var _updatePreference = true;
+
+         var _content = function _content() {};
+
+         var disclosure = function disclosure(selection) {
+           if (_expanded === undefined || _expanded === null) {
+             // loading _expanded here allows it to be reset by calling `disclosure.expanded(null)`
+             var preference = corePreferences('disclosure.' + key + '.expanded');
+             _expanded = preference === null ? !!expandedDefault : preference === 'true';
            }
 
+           var hideToggle = selection.selectAll('.hide-toggle-' + key).data([0]); // enter
 
-           function showMessage(context) {
-             let currMultipolygon = context.hasEntity(multipolygon.id);
-             if (!currMultipolygon) return '';
+           var hideToggleEnter = hideToggle.enter().append('a').attr('href', '#').attr('class', 'hide-toggle hide-toggle-' + key).call(svgIcon('', 'pre-text', 'hide-toggle-icon'));
+           hideToggleEnter.append('span').attr('class', 'hide-toggle-text'); // update
 
-             return _t('issues.old_multipolygon.message',
-                 { multipolygon: utilDisplayLabel(currMultipolygon, context.graph()) }
-             );
+           hideToggle = hideToggleEnter.merge(hideToggle);
+           hideToggle.on('click', toggle).classed('expanded', _expanded);
+           hideToggle.selectAll('.hide-toggle-text').html(_label());
+           hideToggle.selectAll('.hide-toggle-icon').attr('xlink:href', _expanded ? '#iD-icon-down' : _mainLocalizer.textDirection() === 'rtl' ? '#iD-icon-backward' : '#iD-icon-forward');
+           var wrap = selection.selectAll('.disclosure-wrap').data([0]); // enter/update
+
+           wrap = wrap.enter().append('div').attr('class', 'disclosure-wrap disclosure-wrap-' + key).merge(wrap).classed('hide', !_expanded);
+
+           if (_expanded) {
+             wrap.call(_content);
            }
 
+           function toggle(d3_event) {
+             d3_event.preventDefault();
+             _expanded = !_expanded;
 
-           function showReference(selection) {
-             selection.selectAll('.issue-reference')
-               .data([0])
-               .enter()
-               .append('div')
-               .attr('class', 'issue-reference')
-               .text(_t('issues.old_multipolygon.reference'));
+             if (_updatePreference) {
+               corePreferences('disclosure.' + key + '.expanded', _expanded);
+             }
+
+             hideToggle.classed('expanded', _expanded);
+             hideToggle.selectAll('.hide-toggle-icon').attr('xlink:href', _expanded ? '#iD-icon-down' : _mainLocalizer.textDirection() === 'rtl' ? '#iD-icon-backward' : '#iD-icon-forward');
+             wrap.call(uiToggle(_expanded));
+
+             if (_expanded) {
+               wrap.call(_content);
+             }
+
+             dispatch$1.call('toggled', this, _expanded);
            }
-         }
+         };
 
+         disclosure.label = function (val) {
+           if (!arguments.length) return _label;
+           _label = utilFunctor(val);
+           return disclosure;
+         };
 
-         let validation = function checkOutdatedTags(entity, graph) {
-           let issues = oldMultipolygonIssues(entity, graph);
-           if (!issues.length) issues = oldTagIssues(entity, graph);
-           return issues;
+         disclosure.expanded = function (val) {
+           if (!arguments.length) return _expanded;
+           _expanded = val;
+           return disclosure;
          };
 
+         disclosure.updatePreference = function (val) {
+           if (!arguments.length) return _updatePreference;
+           _updatePreference = val;
+           return disclosure;
+         };
 
-         validation.type = type;
+         disclosure.content = function (val) {
+           if (!arguments.length) return _content;
+           _content = val;
+           return disclosure;
+         };
 
-         return validation;
+         return utilRebind(disclosure, dispatch$1, 'on');
        }
 
-       function validationPrivateData() {
-           var type = 'private_data';
-
-           // assume that some buildings are private
-           var privateBuildingValues = {
-               detached: true,
-               farm: true,
-               house: true,
-               houseboat: true,
-               residential: true,
-               semidetached_house: true,
-               static_caravan: true
-           };
+       // Can be labeled and collapsible.
 
-           // but they might be public if they have one of these other tags
-           var publicKeys = {
-               amenity: true,
-               craft: true,
-               historic: true,
-               leisure: true,
-               office: true,
-               shop: true,
-               tourism: true
-           };
+       function uiSection(id, context) {
+         var _classes = utilFunctor('');
 
-           // these tags may contain personally identifying info
-           var personalTags = {
-               'contact:email': true,
-               'contact:fax': true,
-               'contact:phone': true,
-               email: true,
-               fax: true,
-               phone: true
-           };
+         var _shouldDisplay;
 
+         var _content;
 
-           var validation = function checkPrivateData(entity) {
-               var tags = entity.tags;
-               if (!tags.building || !privateBuildingValues[tags.building]) return [];
+         var _disclosure;
 
-               var keepTags = {};
-               for (var k in tags) {
-                   if (publicKeys[k]) return [];  // probably a public feature
-                   if (!personalTags[k]) {
-                       keepTags[k] = tags[k];
-                   }
-               }
+         var _label;
 
-               var tagDiff = utilTagDiff(tags, keepTags);
-               if (!tagDiff.length) return [];
+         var _expandedByDefault = utilFunctor(true);
 
-               var fixID = tagDiff.length === 1 ? 'remove_tag' : 'remove_tags';
+         var _disclosureContent;
 
-               return [new validationIssue({
-                   type: type,
-                   severity: 'warning',
-                   message: showMessage,
-                   reference: showReference,
-                   entityIds: [entity.id],
-                   dynamicFixes: function() {
-                       return [
-                           new validationIssueFix({
-                               icon: 'iD-operation-delete',
-                               title: _t('issues.fix.' + fixID + '.title'),
-                               onClick: function(context) {
-                                   context.perform(doUpgrade, _t('issues.fix.upgrade_tags.annotation'));
-                               }
-                           })
-                       ];
-                   }
-               })];
+         var _disclosureExpanded;
 
+         var _containerSelection = select(null);
 
-               function doUpgrade(graph) {
-                   var currEntity = graph.hasEntity(entity.id);
-                   if (!currEntity) return graph;
+         var section = {
+           id: id
+         };
 
-                   var newTags = Object.assign({}, currEntity.tags);  // shallow copy
-                   tagDiff.forEach(function(diff) {
-                       if (diff.type === '-') {
-                           delete newTags[diff.key];
-                       } else if (diff.type === '+') {
-                           newTags[diff.key] = diff.newVal;
-                       }
-                   });
+         section.classes = function (val) {
+           if (!arguments.length) return _classes;
+           _classes = utilFunctor(val);
+           return section;
+         };
 
-                   return actionChangeTags(currEntity.id, newTags)(graph);
-               }
+         section.label = function (val) {
+           if (!arguments.length) return _label;
+           _label = utilFunctor(val);
+           return section;
+         };
+
+         section.expandedByDefault = function (val) {
+           if (!arguments.length) return _expandedByDefault;
+           _expandedByDefault = utilFunctor(val);
+           return section;
+         };
 
+         section.shouldDisplay = function (val) {
+           if (!arguments.length) return _shouldDisplay;
+           _shouldDisplay = utilFunctor(val);
+           return section;
+         };
 
-               function showMessage(context) {
-                   var currEntity = context.hasEntity(this.entityIds[0]);
-                   if (!currEntity) return '';
+         section.content = function (val) {
+           if (!arguments.length) return _content;
+           _content = val;
+           return section;
+         };
 
-                   return _t('issues.private_data.contact.message',
-                       { feature: utilDisplayLabel(currEntity, context.graph()) }
-                   );
-               }
+         section.disclosureContent = function (val) {
+           if (!arguments.length) return _disclosureContent;
+           _disclosureContent = val;
+           return section;
+         };
 
+         section.disclosureExpanded = function (val) {
+           if (!arguments.length) return _disclosureExpanded;
+           _disclosureExpanded = val;
+           return section;
+         }; // may be called multiple times
 
-               function showReference(selection) {
-                   var enter = selection.selectAll('.issue-reference')
-                       .data([0])
-                       .enter();
 
-                   enter
-                       .append('div')
-                       .attr('class', 'issue-reference')
-                       .text(_t('issues.private_data.reference'));
+         section.render = function (selection) {
+           _containerSelection = selection.selectAll('.section-' + id).data([0]);
 
-                   enter
-                       .append('strong')
-                       .text(_t('issues.suggested'));
+           var sectionEnter = _containerSelection.enter().append('div').attr('class', 'section section-' + id + ' ' + (_classes && _classes() || ''));
 
-                   enter
-                       .append('table')
-                       .attr('class', 'tagDiff-table')
-                       .selectAll('.tagDiff-row')
-                       .data(tagDiff)
-                       .enter()
-                       .append('tr')
-                       .attr('class', 'tagDiff-row')
-                       .append('td')
-                       .attr('class', function(d) {
-                           var klass = d.type === '+' ? 'add' : 'remove';
-                           return 'tagDiff-cell tagDiff-cell-' + klass;
-                       })
-                       .text(function(d) { return d.display; });
-               }
-           };
+           _containerSelection = sectionEnter.merge(_containerSelection);
 
+           _containerSelection.call(renderContent);
+         };
 
-           validation.type = type;
+         section.reRender = function () {
+           _containerSelection.call(renderContent);
+         };
 
-           return validation;
-       }
+         section.selection = function () {
+           return _containerSelection;
+         };
 
-       let _discardNameRegexes = [];
+         section.disclosure = function () {
+           return _disclosure;
+         }; // may be called multiple times
 
-       function validationSuspiciousName() {
-         const type = 'suspicious_name';
-         const keysToTestForGenericValues = [
-           'aerialway', 'aeroway', 'amenity', 'building', 'craft', 'highway',
-           'leisure', 'railway', 'man_made', 'office', 'shop', 'tourism', 'waterway'
-         ];
 
-         // A concern here in switching to async data means that `_nsiFilters` will not
-         // be available at first, so the data on early tiles may not have tags validated fully.
+         function renderContent(selection) {
+           if (_shouldDisplay) {
+             var shouldDisplay = _shouldDisplay();
 
-         _mainFileFetcher.get('nsi_filters')
-           .then(filters => {
-             // known list of generic names (e.g. "bar")
-             _discardNameRegexes = filters.discardNames
-               .map(discardName => new RegExp(discardName, 'i'));
-           })
-           .catch(() => { /* ignore */ });
+             selection.classed('hide', !shouldDisplay);
+
+             if (!shouldDisplay) {
+               selection.html('');
+               return;
+             }
+           }
 
+           if (_disclosureContent) {
+             if (!_disclosure) {
+               _disclosure = uiDisclosure(context, id.replace(/-/g, '_'), _expandedByDefault()).label(_label || '')
+               /*.on('toggled', function(expanded) {
+                   if (expanded) { selection.node().parentNode.scrollTop += 200; }
+               })*/
+               .content(_disclosureContent);
+             }
 
-         function isDiscardedSuggestionName(lowercaseName) {
-           return _discardNameRegexes.some(regex => regex.test(lowercaseName));
-         }
+             if (_disclosureExpanded !== undefined) {
+               _disclosure.expanded(_disclosureExpanded);
 
-         // test if the name is just the key or tag value (e.g. "park")
-         function nameMatchesRawTag(lowercaseName, tags) {
-           for (let i = 0; i < keysToTestForGenericValues.length; i++) {
-             let key = keysToTestForGenericValues[i];
-             let val = tags[key];
-             if (val) {
-               val = val.toLowerCase();
-               if (key === lowercaseName ||
-                 val === lowercaseName ||
-                 key.replace(/\_/g, ' ') === lowercaseName ||
-                 val.replace(/\_/g, ' ') === lowercaseName) {
-                 return true;
-               }
+               _disclosureExpanded = undefined;
              }
+
+             selection.call(_disclosure);
+             return;
+           }
+
+           if (_content) {
+             selection.call(_content);
            }
-           return false;
          }
 
-         function isGenericName(name, tags) {
-           name = name.toLowerCase();
-           return nameMatchesRawTag(name, tags) || isDiscardedSuggestionName(name);
+         return section;
+       }
+
+       // {
+       //   key: 'string',     // required
+       //   value: 'string'    // optional
+       // }
+       //   -or-
+       // {
+       //   qid: 'string'      // brand wikidata  (e.g. 'Q37158')
+       // }
+       //
+
+       function uiTagReference(what) {
+         var wikibase = what.qid ? services.wikidata : services.osmWikibase;
+         var tagReference = {};
+
+         var _button = select(null);
+
+         var _body = select(null);
+
+         var _loaded;
+
+         var _showing;
+
+         function load() {
+           if (!wikibase) return;
+
+           _button.classed('tag-reference-loading', true);
+
+           wikibase.getDocs(what, gotDocs);
          }
 
-         function makeGenericNameIssue(entityId, nameKey, genericName, langCode) {
-           return new validationIssue({
-             type: type,
-             subtype: 'generic_name',
-             severity: 'warning',
-             message: function(context) {
-               let entity = context.hasEntity(this.entityIds[0]);
-               if (!entity) return '';
-               let preset = _mainPresetIndex.match(entity, context.graph());
-               let langName = langCode && _mainLocalizer.languageName(langCode);
-               return _t('issues.generic_name.message' + (langName ? '_language' : ''),
-                 { feature: preset.name(), name: genericName, language: langName }
-               );
-             },
-             reference: showReference,
-             entityIds: [entityId],
-             hash: nameKey + '=' + genericName,
-             dynamicFixes: function() {
-               return [
-                 new validationIssueFix({
-                   icon: 'iD-operation-delete',
-                   title: _t('issues.fix.remove_the_name.title'),
-                   onClick: function(context) {
-                     let entityId = this.issue.entityIds[0];
-                     let entity = context.entity(entityId);
-                     let tags = Object.assign({}, entity.tags);   // shallow copy
-                     delete tags[nameKey];
-                     context.perform(
-                       actionChangeTags(entityId, tags), _t('issues.fix.remove_generic_name.annotation')
-                     );
-                   }
-                 })
-               ];
-             }
-           });
+         function gotDocs(err, docs) {
+           _body.html('');
 
-           function showReference(selection) {
-             selection.selectAll('.issue-reference')
-               .data([0])
-               .enter()
-               .append('div')
-               .attr('class', 'issue-reference')
-               .text(_t('issues.generic_name.reference'));
+           if (!docs || !docs.title) {
+             _body.append('p').attr('class', 'tag-reference-description').html(_t.html('inspector.no_documentation_key'));
+
+             done();
+             return;
            }
-         }
 
-         function makeIncorrectNameIssue(entityId, nameKey, incorrectName, langCode) {
-           return new validationIssue({
-             type: type,
-             subtype: 'not_name',
-             severity: 'warning',
-             message: function(context) {
-               const entity = context.hasEntity(this.entityIds[0]);
-               if (!entity) return '';
-               const preset = _mainPresetIndex.match(entity, context.graph());
-               const langName = langCode && _mainLocalizer.languageName(langCode);
-               return _t('issues.incorrect_name.message' + (langName ? '_language' : ''),
-                 { feature: preset.name(), name: incorrectName, language: langName }
-               );
-             },
-             reference: showReference,
-             entityIds: [entityId],
-             hash: nameKey + '=' + incorrectName,
-             dynamicFixes: function() {
-               return [
-                 new validationIssueFix({
-                   icon: 'iD-operation-delete',
-                   title: _t('issues.fix.remove_the_name.title'),
-                   onClick: function(context) {
-                     const entityId = this.issue.entityIds[0];
-                     const entity = context.entity(entityId);
-                     let tags = Object.assign({}, entity.tags);   // shallow copy
-                     delete tags[nameKey];
-                     context.perform(
-                       actionChangeTags(entityId, tags), _t('issues.fix.remove_mistaken_name.annotation')
-                     );
-                   }
-                 })
-               ];
-             }
-           });
+           if (docs.imageURL) {
+             _body.append('img').attr('class', 'tag-reference-wiki-image').attr('src', docs.imageURL).on('load', function () {
+               done();
+             }).on('error', function () {
+               select(this).remove();
+               done();
+             });
+           } else {
+             done();
+           }
 
-           function showReference(selection) {
-             selection.selectAll('.issue-reference')
-               .data([0])
-               .enter()
-               .append('div')
-               .attr('class', 'issue-reference')
-               .text(_t('issues.generic_name.reference'));
+           _body.append('p').attr('class', 'tag-reference-description').html(docs.description ? _mainLocalizer.htmlForLocalizedText(docs.description, docs.descriptionLocaleCode) : _t.html('inspector.no_documentation_key')).append('a').attr('class', 'tag-reference-edit').attr('target', '_blank').attr('title', _t('inspector.edit_reference')).attr('href', docs.editURL).call(svgIcon('#iD-icon-edit', 'inline'));
+
+           if (docs.wiki) {
+             _body.append('a').attr('class', 'tag-reference-link').attr('target', '_blank').attr('href', docs.wiki.url).call(svgIcon('#iD-icon-out-link', 'inline')).append('span').html(_t.html(docs.wiki.text));
+           } // Add link to info about "good changeset comments" - #2923
+
+
+           if (what.key === 'comment') {
+             _body.append('a').attr('class', 'tag-reference-comment-link').attr('target', '_blank').call(svgIcon('#iD-icon-out-link', 'inline')).attr('href', _t('commit.about_changeset_comments_link')).append('span').html(_t.html('commit.about_changeset_comments'));
            }
          }
 
+         function done() {
+           _loaded = true;
 
-         let validation = function checkGenericName(entity) {
-           // a generic name is okay if it's a known brand or entity
-           if (entity.hasWikidata()) return [];
+           _button.classed('tag-reference-loading', false);
 
-           let issues = [];
-           const notNames = (entity.tags['not:name'] || '').split(';');
+           _body.classed('expanded', true).transition().duration(200).style('max-height', '200px').style('opacity', '1');
 
-           for (let key in entity.tags) {
-             const m = key.match(/^name(?:(?::)([a-zA-Z_-]+))?$/);
-             if (!m) continue;
+           _showing = true;
 
-             const langCode = m.length >= 2 ? m[1] : null;
-             const value = entity.tags[key];
-             if (notNames.length) {
-               for (let i in notNames) {
-                 const notName = notNames[i];
-                 if (notName && value === notName) {
-                   issues.push(makeIncorrectNameIssue(entity.id, key, value, langCode));
-                   continue;
-                 }
-               }
+           _button.selectAll('svg.icon use').each(function () {
+             var iconUse = select(this);
+
+             if (iconUse.attr('href') === '#iD-icon-info') {
+               iconUse.attr('href', '#iD-icon-info-filled');
              }
-             if (isGenericName(value, entity.tags)) {
-               issues.push(makeGenericNameIssue(entity.id, key, value, langCode));
+           });
+         }
+
+         function hide() {
+           _body.transition().duration(200).style('max-height', '0px').style('opacity', '0').on('end', function () {
+             _body.classed('expanded', false);
+           });
+
+           _showing = false;
+
+           _button.selectAll('svg.icon use').each(function () {
+             var iconUse = select(this);
+
+             if (iconUse.attr('href') === '#iD-icon-info-filled') {
+               iconUse.attr('href', '#iD-icon-info');
              }
-           }
+           });
+         }
 
-           return issues;
-         };
+         tagReference.button = function (selection, klass, iconName) {
+           _button = selection.selectAll('.tag-reference-button').data([0]);
+           _button = _button.enter().append('button').attr('class', 'tag-reference-button ' + (klass || '')).attr('title', _t('icons.information')).call(svgIcon('#iD-icon-' + (iconName || 'inspect'))).merge(_button);
 
+           _button.on('click', function (d3_event) {
+             d3_event.stopPropagation();
+             d3_event.preventDefault();
+             this.blur(); // avoid keeping focus on the button - #4641
 
-         validation.type = type;
+             if (_showing) {
+               hide();
+             } else if (_loaded) {
+               done();
+             } else {
+               load();
+             }
+           });
+         };
 
-         return validation;
-       }
+         tagReference.body = function (selection) {
+           var itemID = what.qid || what.key + '-' + (what.value || '');
+           _body = selection.selectAll('.tag-reference-body').data([itemID], function (d) {
+             return d;
+           });
 
-       function validationUnsquareWay(context) {
-           var type = 'unsquare_way';
-           var DEFAULT_DEG_THRESHOLD = 5;   // see also issues.js
+           _body.exit().remove();
 
-           // use looser epsilon for detection to reduce warnings of buildings that are essentially square already
-           var epsilon = 0.05;
-           var nodeThreshold = 10;
+           _body = _body.enter().append('div').attr('class', 'tag-reference-body').style('max-height', '0').style('opacity', '0').merge(_body);
 
-           function isBuilding(entity, graph) {
-               if (entity.type !== 'way' || entity.geometry(graph) !== 'area') return false;
-               return entity.tags.building && entity.tags.building !== 'no';
+           if (_showing === false) {
+             hide();
            }
+         };
 
+         tagReference.showing = function (val) {
+           if (!arguments.length) return _showing;
+           _showing = val;
+           return tagReference;
+         };
 
-           var validation = function checkUnsquareWay(entity, graph) {
+         return tagReference;
+       }
 
-               if (!isBuilding(entity, graph)) return [];
+       function uiSectionRawTagEditor(id, context) {
+         var section = uiSection(id, context).classes('raw-tag-editor').label(function () {
+           var count = Object.keys(_tags).filter(function (d) {
+             return d;
+           }).length;
+           return _t('inspector.title_count', {
+             title: _t.html('inspector.tags'),
+             count: count
+           });
+         }).expandedByDefault(false).disclosureContent(renderDisclosureContent);
+         var taginfo = services.taginfo;
+         var dispatch$1 = dispatch('change');
+         var availableViews = [{
+           id: 'list',
+           icon: '#fas-th-list'
+         }, {
+           id: 'text',
+           icon: '#fas-i-cursor'
+         }];
 
-               // don't flag ways marked as physically unsquare
-               if (entity.tags.nonsquare === 'yes') return [];
+         var _tagView = corePreferences('raw-tag-editor-view') || 'list'; // 'list, 'text'
 
-               var isClosed = entity.isClosed();
-               if (!isClosed) return [];        // this building has bigger problems
 
-               // don't flag ways with lots of nodes since they are likely detail-mapped
-               var nodes = graph.childNodes(entity).slice();    // shallow copy
-               if (nodes.length > nodeThreshold + 1) return [];   // +1 because closing node appears twice
+         var _readOnlyTags = []; // the keys in the order we want them to display
 
-               // ignore if not all nodes are fully downloaded
-               var osm = services.osm;
-               if (!osm || nodes.some(function(node) { return !osm.isDataLoaded(node.loc); })) return [];
-
-               // don't flag connected ways to avoid unresolvable unsquare loops
-               var hasConnectedSquarableWays = nodes.some(function(node) {
-                   return graph.parentWays(node).some(function(way) {
-                       if (way.id === entity.id) return false;
-                       if (isBuilding(way, graph)) return true;
-                       return graph.parentRelations(way).some(function(parentRelation) {
-                           return parentRelation.isMultipolygon() &&
-                               parentRelation.tags.building &&
-                               parentRelation.tags.building !== 'no';
-                       });
-                   });
-               });
-               if (hasConnectedSquarableWays) return [];
+         var _orderedKeys = [];
+         var _showBlank = false;
+         var _pendingChange = null;
 
+         var _state;
 
-               // user-configurable square threshold
-               var storedDegreeThreshold = corePreferences('validate-square-degrees');
-               var degreeThreshold = isNaN(storedDegreeThreshold) ? DEFAULT_DEG_THRESHOLD : parseFloat(storedDegreeThreshold);
+         var _presets;
 
-               var points = nodes.map(function(node) { return context.projection(node.loc); });
-               if (!geoOrthoCanOrthogonalize(points, isClosed, epsilon, degreeThreshold, true)) return [];
+         var _tags;
 
-               var autoArgs;
-               // don't allow autosquaring features linked to wikidata
-               if (!entity.tags.wikidata) {
-                   // use same degree threshold as for detection
-                   var autoAction = actionOrthogonalize(entity.id, context.projection, undefined, degreeThreshold);
-                   autoAction.transitionable = false;  // when autofixing, do it instantly
-                   autoArgs = [autoAction, _t('operations.orthogonalize.annotation.feature.single')];
-               }
+         var _entityIDs;
 
-               return [new validationIssue({
-                   type: type,
-                   subtype: 'building',
-                   severity: 'warning',
-                   message: function(context) {
-                       var entity = context.hasEntity(this.entityIds[0]);
-                       return entity ? _t('issues.unsquare_way.message', { feature: utilDisplayLabel(entity, context.graph()) }) : '';
-                   },
-                   reference: showReference,
-                   entityIds: [entity.id],
-                   hash: JSON.stringify(autoArgs !== undefined) + degreeThreshold,
-                   dynamicFixes: function() {
-                       return [
-                           new validationIssueFix({
-                               icon: 'iD-operation-orthogonalize',
-                               title: _t('issues.fix.square_feature.title'),
-                               autoArgs: autoArgs,
-                               onClick: function(context, completionHandler) {
-                                   var entityId = this.issue.entityIds[0];
-                                   // use same degree threshold as for detection
-                                   context.perform(
-                                       actionOrthogonalize(entityId, context.projection, undefined, degreeThreshold),
-                                       _t('operations.orthogonalize.annotation.feature.single')
-                                   );
-                                   // run after the squaring transition (currently 150ms)
-                                   window.setTimeout(function() { completionHandler(); }, 175);
-                               }
-                           }),
-                           /*
-                           new validationIssueFix({
-                               title: t('issues.fix.tag_as_unsquare.title'),
-                               onClick: function(context) {
-                                   var entityId = this.issue.entityIds[0];
-                                   var entity = context.entity(entityId);
-                                   var tags = Object.assign({}, entity.tags);  // shallow copy
-                                   tags.nonsquare = 'yes';
-                                   context.perform(
-                                       actionChangeTags(entityId, tags),
-                                       t('issues.fix.tag_as_unsquare.annotation')
-                                   );
-                               }
-                           })
-                           */
-                       ];
-                   }
-               })];
+         var _didInteract = false;
 
-               function showReference(selection) {
-                   selection.selectAll('.issue-reference')
-                       .data([0])
-                       .enter()
-                       .append('div')
-                       .attr('class', 'issue-reference')
-                       .text(_t('issues.unsquare_way.buildings.reference'));
-               }
-           };
+         function interacted() {
+           _didInteract = true;
+         }
 
-           validation.type = type;
+         function renderDisclosureContent(wrap) {
+           // remove deleted keys
+           _orderedKeys = _orderedKeys.filter(function (key) {
+             return _tags[key] !== undefined;
+           }); // When switching to a different entity or changing the state (hover/select)
+           // reorder the keys alphabetically.
+           // We trigger this by emptying the `_orderedKeys` array, then it will be rebuilt here.
+           // Otherwise leave their order alone - #5857, #5927
 
-           return validation;
-       }
+           var all = Object.keys(_tags).sort();
+           var missingKeys = utilArrayDifference(all, _orderedKeys);
 
-       var Validations = /*#__PURE__*/Object.freeze({
-               __proto__: null,
-               validationAlmostJunction: validationAlmostJunction,
-               validationCloseNodes: validationCloseNodes,
-               validationCrossingWays: validationCrossingWays,
-               validationDisconnectedWay: validationDisconnectedWay,
-               validationFormatting: validationFormatting,
-               validationHelpRequest: validationHelpRequest,
-               validationImpossibleOneway: validationImpossibleOneway,
-               validationIncompatibleSource: validationIncompatibleSource,
-               validationMaprules: validationMaprules,
-               validationMismatchedGeometry: validationMismatchedGeometry,
-               validationMissingRole: validationMissingRole,
-               validationMissingTag: validationMissingTag,
-               validationOutdatedTags: validationOutdatedTags,
-               validationPrivateData: validationPrivateData,
-               validationSuspiciousName: validationSuspiciousName,
-               validationUnsquareWay: validationUnsquareWay
-       });
+           for (var i in missingKeys) {
+             _orderedKeys.push(missingKeys[i]);
+           } // assemble row data
 
-       function coreValidator(context) {
-           var dispatch$1 = dispatch('validated', 'focusedIssue');
-           var validator = utilRebind({}, dispatch$1, 'on');
 
-           var _rules = {};
-           var _disabledRules = {};
+           var rowData = _orderedKeys.map(function (key, i) {
+             return {
+               index: i,
+               key: key,
+               value: _tags[key]
+             };
+           }); // append blank row last, if necessary
 
-           var _ignoredIssueIDs = {};          // issue.id -> true
-           var _baseCache = validationCache(); // issues before any user edits
-           var _headCache = validationCache(); // issues after all user edits
-           var _validatedGraph = null;
-           var _deferred = new Set();
 
-           //
-           // initialize the validator rulesets
-           //
-           validator.init = function() {
-               Object.values(Validations).forEach(function(validation) {
-                   if (typeof validation !== 'function') return;
+           if (!rowData.length || _showBlank) {
+             _showBlank = false;
+             rowData.push({
+               index: rowData.length,
+               key: '',
+               value: ''
+             });
+           } // View Options
+
+
+           var options = wrap.selectAll('.raw-tag-options').data([0]);
+           options.exit().remove();
+           var optionsEnter = options.enter().insert('div', ':first-child').attr('class', 'raw-tag-options');
+           var optionEnter = optionsEnter.selectAll('.raw-tag-option').data(availableViews, function (d) {
+             return d.id;
+           }).enter();
+           optionEnter.append('button').attr('class', function (d) {
+             return 'raw-tag-option raw-tag-option-' + d.id + (_tagView === d.id ? ' selected' : '');
+           }).attr('title', function (d) {
+             return _t('icons.' + d.id);
+           }).on('click', function (d3_event, d) {
+             _tagView = d.id;
+             corePreferences('raw-tag-editor-view', d.id);
+             wrap.selectAll('.raw-tag-option').classed('selected', function (datum) {
+               return datum === d;
+             });
+             wrap.selectAll('.tag-text').classed('hide', d.id !== 'text').each(setTextareaHeight);
+             wrap.selectAll('.tag-list, .add-row').classed('hide', d.id !== 'list');
+           }).each(function (d) {
+             select(this).call(svgIcon(d.icon));
+           }); // View as Text
 
-                   var fn = validation(context);
-                   var key = fn.type;
-                   _rules[key] = fn;
-               });
+           var textData = rowsToText(rowData);
+           var textarea = wrap.selectAll('.tag-text').data([0]);
+           textarea = textarea.enter().append('textarea').attr('class', 'tag-text' + (_tagView !== 'text' ? ' hide' : '')).call(utilNoAuto).attr('placeholder', _t('inspector.key_value')).attr('spellcheck', 'false').merge(textarea);
+           textarea.call(utilGetSetValue, textData).each(setTextareaHeight).on('input', setTextareaHeight).on('focus', interacted).on('blur', textChanged).on('change', textChanged); // View as List
 
-               var disabledRules = corePreferences('validate-disabledRules');
-               if (disabledRules) {
-                   disabledRules.split(',')
-                       .forEach(function(key) { _disabledRules[key] = true; });
-               }
-           };
+           var list = wrap.selectAll('.tag-list').data([0]);
+           list = list.enter().append('ul').attr('class', 'tag-list' + (_tagView !== 'list' ? ' hide' : '')).merge(list); // Container for the Add button
 
+           var addRowEnter = wrap.selectAll('.add-row').data([0]).enter().append('div').attr('class', 'add-row' + (_tagView !== 'list' ? ' hide' : ''));
+           addRowEnter.append('button').attr('class', 'add-tag').call(svgIcon('#iD-icon-plus', 'light')).on('click', addTag);
+           addRowEnter.append('div').attr('class', 'space-value'); // preserve space
 
-           //
-           // clear caches, called whenever iD resets after a save
-           //
-           validator.reset = function() {
-               Array.from(_deferred).forEach(function(handle) {
-                   window.cancelIdleCallback(handle);
-                   _deferred.delete(handle);
-               });
+           addRowEnter.append('div').attr('class', 'space-buttons'); // preserve space
+           // Tag list items
 
-               // clear caches
-               _ignoredIssueIDs = {};
-               _baseCache = validationCache();
-               _headCache = validationCache();
-               _validatedGraph = null;
-           };
+           var items = list.selectAll('.tag-row').data(rowData, function (d) {
+             return d.key;
+           });
+           items.exit().each(unbind).remove(); // Enter
 
-           validator.resetIgnoredIssues = function() {
-               _ignoredIssueIDs = {};
-               // reload UI
-               dispatch$1.call('validated');
-           };
+           var itemsEnter = items.enter().append('li').attr('class', 'tag-row').classed('readonly', isReadOnly);
+           var innerWrap = itemsEnter.append('div').attr('class', 'inner-wrap');
+           innerWrap.append('div').attr('class', 'key-wrap').append('input').property('type', 'text').attr('class', 'key').call(utilNoAuto).on('focus', interacted).on('blur', keyChange).on('change', keyChange);
+           innerWrap.append('div').attr('class', 'value-wrap').append('input').property('type', 'text').attr('class', 'value').call(utilNoAuto).on('focus', interacted).on('blur', valueChange).on('change', valueChange).on('keydown.push-more', pushMore);
+           innerWrap.append('button').attr('class', 'form-field-button remove').attr('title', _t('icons.remove')).call(svgIcon('#iD-operation-delete')); // Update
 
+           items = items.merge(itemsEnter).sort(function (a, b) {
+             return a.index - b.index;
+           });
+           items.each(function (d) {
+             var row = select(this);
+             var key = row.select('input.key'); // propagate bound data
 
-           // must update issues when the user changes the unsquare thereshold
-           validator.reloadUnsquareIssues = function() {
+             var value = row.select('input.value'); // propagate bound data
 
-               reloadUnsquareIssues(_headCache, context.graph());
-               reloadUnsquareIssues(_baseCache, context.history().base());
+             if (_entityIDs && taginfo && _state !== 'hover') {
+               bindTypeahead(key, value);
+             }
 
-               dispatch$1.call('validated');
-           };
+             var referenceOptions = {
+               key: d.key
+             };
 
-           function reloadUnsquareIssues(cache, graph) {
+             if (typeof d.value === 'string') {
+               referenceOptions.value = d.value;
+             }
 
-               var checkUnsquareWay = _rules.unsquare_way;
-               if (typeof checkUnsquareWay !== 'function') return;
+             var reference = uiTagReference(referenceOptions);
 
-               // uncache existing
-               cache.uncacheIssuesOfType('unsquare_way');
+             if (_state === 'hover') {
+               reference.showing(false);
+             }
 
-               var buildings = context.history().tree().intersects(geoExtent([-180,-90],[180, 90]), graph)  // everywhere
-                   .filter(function(entity) {
-                       return entity.type === 'way' && entity.tags.building && entity.tags.building !== 'no';
-                   });
+             row.select('.inner-wrap') // propagate bound data
+             .call(reference.button);
+             row.call(reference.body);
+             row.select('button.remove'); // propagate bound data
+           });
+           items.selectAll('input.key').attr('title', function (d) {
+             return d.key;
+           }).call(utilGetSetValue, function (d) {
+             return d.key;
+           }).attr('readonly', function (d) {
+             return isReadOnly(d) || typeof d.value !== 'string' || null;
+           });
+           items.selectAll('input.value').attr('title', function (d) {
+             return Array.isArray(d.value) ? d.value.filter(Boolean).join('\n') : d.value;
+           }).classed('mixed', function (d) {
+             return Array.isArray(d.value);
+           }).attr('placeholder', function (d) {
+             return typeof d.value === 'string' ? null : _t('inspector.multiple_values');
+           }).call(utilGetSetValue, function (d) {
+             return typeof d.value === 'string' ? d.value : '';
+           }).attr('readonly', function (d) {
+             return isReadOnly(d) || null;
+           });
+           items.selectAll('button.remove').on(('PointerEvent' in window ? 'pointer' : 'mouse') + 'down', removeTag); // 'click' fires too late - #5878
+         }
 
-               // rerun for all buildings
-               buildings.forEach(function(entity) {
-                   var detected = checkUnsquareWay(entity, graph);
-                   if (detected.length !== 1) return;
-                   var issue = detected[0];
-                   if (!cache.issuesByEntityID[entity.id]) {
-                       cache.issuesByEntityID[entity.id] = new Set();
-                   }
-                   cache.issuesByEntityID[entity.id].add(issue.id);
-                   cache.issuesByIssueID[issue.id] = issue;
-               });
+         function isReadOnly(d) {
+           for (var i = 0; i < _readOnlyTags.length; i++) {
+             if (d.key.match(_readOnlyTags[i]) !== null) {
+               return true;
+             }
            }
 
-           // options = {
-           //     what: 'all',     // 'all' or 'edited'
-           //     where: 'all',   // 'all' or 'visible'
-           //     includeIgnored: false   // true, false, or 'only'
-           //     includeDisabledRules: false   // true, false, or 'only'
-           // };
-           validator.getIssues = function(options) {
-               var opts = Object.assign({ what: 'all', where: 'all', includeIgnored: false, includeDisabledRules: false }, options);
-               var issues = Object.values(_headCache.issuesByIssueID);
-               var view = context.map().extent();
-
-               return issues.filter(function(issue) {
-                   if (!issue) return false;
-                   if (opts.includeDisabledRules === 'only' && !_disabledRules[issue.type]) return false;
-                   if (!opts.includeDisabledRules && _disabledRules[issue.type]) return false;
-
-                   if (opts.includeIgnored === 'only' && !_ignoredIssueIDs[issue.id]) return false;
-                   if (!opts.includeIgnored && _ignoredIssueIDs[issue.id]) return false;
-
-                   // Sanity check:  This issue may be for an entity that not longer exists.
-                   // If we detect this, uncache and return false so it is not included..
-                   var entityIds = issue.entityIds || [];
-                   for (var i = 0; i < entityIds.length; i++) {
-                       var entityId = entityIds[i];
-                       if (!context.hasEntity(entityId)) {
-                           delete _headCache.issuesByEntityID[entityId];
-                           delete _headCache.issuesByIssueID[issue.id];
-                           return false;
-                       }
-                   }
+           return false;
+         }
 
-                   if (opts.what === 'edited' && _baseCache.issuesByIssueID[issue.id]) return false;
+         function setTextareaHeight() {
+           if (_tagView !== 'text') return;
+           var selection = select(this);
+           var matches = selection.node().value.match(/\n/g);
+           var lineCount = 2 + Number(matches && matches.length);
+           var lineHeight = 20;
+           selection.style('height', lineCount * lineHeight + 'px');
+         }
 
-                   if (opts.where === 'visible') {
-                       var extent = issue.extent(context.graph());
-                       if (!view.intersects(extent)) return false;
-                   }
+         function stringify(s) {
+           return JSON.stringify(s).slice(1, -1); // without leading/trailing "
+         }
 
-                   return true;
-               });
-           };
+         function unstringify(s) {
+           var leading = '';
+           var trailing = '';
 
-           validator.getResolvedIssues = function() {
-               var baseIssues = Object.values(_baseCache.issuesByIssueID);
-               return baseIssues.filter(function(issue) {
-                   return !_headCache.issuesByIssueID[issue.id];
-               });
-           };
+           if (s.length < 1 || s.charAt(0) !== '"') {
+             leading = '"';
+           }
 
-           validator.focusIssue = function(issue) {
-               var extent = issue.extent(context.graph());
+           if (s.length < 2 || s.charAt(s.length - 1) !== '"' || s.charAt(s.length - 1) === '"' && s.charAt(s.length - 2) === '\\') {
+             trailing = '"';
+           }
 
-               if (extent) {
-                   var setZoom = Math.max(context.map().zoom(), 19);
-                   context.map().unobscuredCenterZoomEase(extent.center(), setZoom);
-
-                   // select the first entity
-                   if (issue.entityIds && issue.entityIds.length) {
-                       window.setTimeout(function() {
-                           var ids = issue.entityIds;
-                           context.enter(modeSelect(context, [ids[0]]));
-                           dispatch$1.call('focusedIssue', this, issue);
-                       }, 250);  // after ease
-                   }
-               }
-           };
+           return JSON.parse(leading + s + trailing);
+         }
 
+         function rowsToText(rows) {
+           var str = rows.filter(function (row) {
+             return row.key && row.key.trim() !== '';
+           }).map(function (row) {
+             var rawVal = row.value;
+             if (typeof rawVal !== 'string') rawVal = '*';
+             var val = rawVal ? stringify(rawVal) : '';
+             return stringify(row.key) + '=' + val;
+           }).join('\n');
 
-           validator.getIssuesBySeverity = function(options) {
-               var groups = utilArrayGroupBy(validator.getIssues(options), 'severity');
-               groups.error = groups.error || [];
-               groups.warning = groups.warning || [];
-               return groups;
-           };
+           if (_state !== 'hover' && str.length) {
+             return str + '\n';
+           }
 
-           // show some issue types in a particular order
-           var orderedIssueTypes = [
-               // flag missing data first
-               'missing_tag', 'missing_role',
-               // then flag identity issues
-               'outdated_tags', 'mismatched_geometry',
-               // flag geometry issues where fixing them might solve connectivity issues
-               'crossing_ways', 'almost_junction',
-               // then flag connectivity issues
-               'disconnected_way', 'impossible_oneway'
-           ];
-
-           // returns the issues that the given entity IDs have in common, matching the given options
-           validator.getSharedEntityIssues = function(entityIDs, options) {
-               var cache = _headCache;
-
-               // gather the issues that are common to all the entities
-               var issueIDs = entityIDs.reduce(function(acc, entityID) {
-                   var entityIssueIDs = cache.issuesByEntityID[entityID] || new Set();
-                   if (!acc) {
-                       return new Set(entityIssueIDs);
-                   }
-                   return new Set([...acc].filter(function(elem) {
-                       return entityIssueIDs.has(elem);
-                   }));
-               }, null) || [];
+           return str;
+         }
 
-               var opts = options || {};
+         function textChanged() {
+           var newText = this.value.trim();
+           var newTags = {};
+           newText.split('\n').forEach(function (row) {
+             var m = row.match(/^\s*([^=]+)=(.*)$/);
 
-               return Array.from(issueIDs)
-                   .map(function(id) { return cache.issuesByIssueID[id]; })
-                   .filter(function(issue) {
-                       if (!issue) return false;
-                       if (opts.includeDisabledRules === 'only' && !_disabledRules[issue.type]) return false;
-                       if (!opts.includeDisabledRules && _disabledRules[issue.type]) return false;
+             if (m !== null) {
+               var k = context.cleanTagKey(unstringify(m[1].trim()));
+               var v = context.cleanTagValue(unstringify(m[2].trim()));
+               newTags[k] = v;
+             }
+           });
+           var tagDiff = utilTagDiff(_tags, newTags);
+           if (!tagDiff.length) return;
+           _pendingChange = _pendingChange || {};
+           tagDiff.forEach(function (change) {
+             if (isReadOnly({
+               key: change.key
+             })) return; // skip unchanged multiselection placeholders
 
-                       if (opts.includeIgnored === 'only' && !_ignoredIssueIDs[issue.id]) return false;
-                       if (!opts.includeIgnored && _ignoredIssueIDs[issue.id]) return false;
+             if (change.newVal === '*' && typeof change.oldVal !== 'string') return;
 
-                       return true;
-                   }).sort(function(issue1, issue2) {
-                       if (issue1.type === issue2.type) {
-                           // issues of the same type, sort deterministically
-                           return issue1.id < issue2.id ? -1 : 1;
-                       }
-                       var index1 = orderedIssueTypes.indexOf(issue1.type);
-                       var index2 = orderedIssueTypes.indexOf(issue2.type);
-                       if (index1 !== -1 && index2 !== -1) {
-                           // both issue types have explicit sort orders
-                           return index1 - index2;
-                       } else if (index1 === -1 && index2 === -1) {
-                           // neither issue type has an explicit sort order, sort by type
-                           return issue1.type < issue2.type ? -1 : 1;
-                       } else {
-                           // order explicit types before everything else
-                           return index1 !== -1 ? -1 : 1;
-                       }
-                   });
-           };
+             if (change.type === '-') {
+               _pendingChange[change.key] = undefined;
+             } else if (change.type === '+') {
+               _pendingChange[change.key] = change.newVal || '';
+             }
+           });
 
+           if (Object.keys(_pendingChange).length === 0) {
+             _pendingChange = null;
+             return;
+           }
 
-           validator.getEntityIssues = function(entityID, options) {
-               return validator.getSharedEntityIssues([entityID], options);
-           };
+           scheduleChange();
+         }
 
+         function pushMore(d3_event) {
+           // if pressing Tab on the last value field with content, add a blank row
+           if (d3_event.keyCode === 9 && !d3_event.shiftKey && section.selection().selectAll('.tag-list li:last-child input.value').node() === this && utilGetSetValue(select(this))) {
+             addTag();
+           }
+         }
 
-           validator.getRuleKeys = function() {
-               return Object.keys(_rules);
-           };
+         function bindTypeahead(key, value) {
+           if (isReadOnly(key.datum())) return;
 
+           if (Array.isArray(value.datum().value)) {
+             value.call(uiCombobox(context, 'tag-value').minItems(1).fetcher(function (value, callback) {
+               var keyString = utilGetSetValue(key);
+               if (!_tags[keyString]) return;
 
-           validator.isRuleEnabled = function(key) {
-               return !_disabledRules[key];
-           };
+               var data = _tags[keyString].filter(Boolean).map(function (tagValue) {
+                 return {
+                   value: tagValue,
+                   title: tagValue
+                 };
+               });
+
+               callback(data);
+             }));
+             return;
+           }
+
+           var geometry = context.graph().geometry(_entityIDs[0]);
+           key.call(uiCombobox(context, 'tag-key').fetcher(function (value, callback) {
+             taginfo.keys({
+               debounce: true,
+               geometry: geometry,
+               query: value
+             }, function (err, data) {
+               if (!err) {
+                 var filtered = data.filter(function (d) {
+                   return _tags[d.value] === undefined;
+                 });
+                 callback(sort(value, filtered));
+               }
+             });
+           }));
+           value.call(uiCombobox(context, 'tag-value').fetcher(function (value, callback) {
+             taginfo.values({
+               debounce: true,
+               key: utilGetSetValue(key),
+               geometry: geometry,
+               query: value
+             }, function (err, data) {
+               if (!err) callback(sort(value, data));
+             });
+           }));
 
+           function sort(value, data) {
+             var sameletter = [];
+             var other = [];
 
-           validator.toggleRule = function(key) {
-               if (_disabledRules[key]) {
-                   delete _disabledRules[key];
+             for (var i = 0; i < data.length; i++) {
+               if (data[i].value.substring(0, value.length) === value) {
+                 sameletter.push(data[i]);
                } else {
-                   _disabledRules[key] = true;
+                 other.push(data[i]);
                }
+             }
 
-               corePreferences('validate-disabledRules', Object.keys(_disabledRules).join(','));
-               validator.validate();
-           };
+             return sameletter.concat(other);
+           }
+         }
 
+         function unbind() {
+           var row = select(this);
+           row.selectAll('input.key').call(uiCombobox.off, context);
+           row.selectAll('input.value').call(uiCombobox.off, context);
+         }
 
-           validator.disableRules = function(keys) {
-               _disabledRules = {};
-               keys.forEach(function(k) {
-                   _disabledRules[k] = true;
-               });
+         function keyChange(d3_event, d) {
+           if (select(this).attr('readonly')) return;
+           var kOld = d.key; // exit if we are currently about to delete this row anyway - #6366
 
-               corePreferences('validate-disabledRules', Object.keys(_disabledRules).join(','));
-               validator.validate();
-           };
+           if (_pendingChange && _pendingChange.hasOwnProperty(kOld) && _pendingChange[kOld] === undefined) return;
+           var kNew = context.cleanTagKey(this.value.trim()); // allow no change if the key should be readonly
 
+           if (isReadOnly({
+             key: kNew
+           })) {
+             this.value = kOld;
+             return;
+           }
 
-           validator.ignoreIssue = function(id) {
-               _ignoredIssueIDs[id] = true;
-           };
+           if (kNew && kNew !== kOld && _tags[kNew] !== undefined) {
+             // new key is already in use, switch focus to the existing row
+             this.value = kOld; // reset the key
+
+             section.selection().selectAll('.tag-list input.value').each(function (d) {
+               if (d.key === kNew) {
+                 // send focus to that other value combo instead
+                 var input = select(this).node();
+                 input.focus();
+                 input.select();
+               }
+             });
+             return;
+           }
 
+           var row = this.parentNode.parentNode;
+           var inputVal = select(row).selectAll('input.value');
+           var vNew = context.cleanTagValue(utilGetSetValue(inputVal));
+           _pendingChange = _pendingChange || {};
 
-           //
-           // Run validation on a single entity for the given graph
-           //
-           function validateEntity(entity, graph) {
-               var entityIssues = [];
+           if (kOld) {
+             _pendingChange[kOld] = undefined;
+           }
 
-               // runs validation and appends resulting issues
-               function runValidation(key) {
+           _pendingChange[kNew] = vNew; // update the ordered key index so this row doesn't change position
 
-                   var fn = _rules[key];
-                   if (typeof fn !== 'function') {
-                       console.error('no such validation rule = ' + key);  // eslint-disable-line no-console
-                       return;
-                   }
+           var existingKeyIndex = _orderedKeys.indexOf(kOld);
 
-                   var detected = fn(entity, graph);
-                   entityIssues = entityIssues.concat(detected);
-               }
+           if (existingKeyIndex !== -1) _orderedKeys[existingKeyIndex] = kNew;
+           d.key = kNew; // update datum to avoid exit/enter on tag update
+
+           d.value = vNew;
+           this.value = kNew;
+           utilGetSetValue(inputVal, vNew);
+           scheduleChange();
+         }
+
+         function valueChange(d3_event, d) {
+           if (isReadOnly(d)) return; // exit if this is a multiselection and no value was entered
+
+           if (typeof d.value !== 'string' && !this.value) return; // exit if we are currently about to delete this row anyway - #6366
+
+           if (_pendingChange && _pendingChange.hasOwnProperty(d.key) && _pendingChange[d.key] === undefined) return;
+           _pendingChange = _pendingChange || {};
+           _pendingChange[d.key] = context.cleanTagValue(this.value);
+           scheduleChange();
+         }
 
-               // run all rules
-               Object.keys(_rules).forEach(runValidation);
+         function removeTag(d3_event, d) {
+           if (isReadOnly(d)) return;
 
-               return entityIssues;
+           if (d.key === '') {
+             // removing the blank row
+             _showBlank = false;
+             section.reRender();
+           } else {
+             // remove the key from the ordered key index
+             _orderedKeys = _orderedKeys.filter(function (key) {
+               return key !== d.key;
+             });
+             _pendingChange = _pendingChange || {};
+             _pendingChange[d.key] = undefined;
+             scheduleChange();
            }
+         }
 
-           function entityIDsToValidate(entityIDs, graph) {
-               var processedIDs = new Set();
-               return entityIDs.reduce(function(acc, entityID) {
-                   // keep redundancy check separate from `acc` because an `entityID`
-                   // could have been added to `acc` as a related entity through an earlier pass
-                   if (processedIDs.has(entityID)) return acc;
-                   processedIDs.add(entityID);
+         function addTag() {
+           // Delay render in case this click is blurring an edited combo.
+           // Without the setTimeout, the `content` render would wipe out the pending tag change.
+           window.setTimeout(function () {
+             _showBlank = true;
+             section.reRender();
+             section.selection().selectAll('.tag-list li:last-child input.key').node().focus();
+           }, 20);
+         }
 
-                   var entity = graph.hasEntity(entityID);
-                   if (!entity) return acc;
+         function scheduleChange() {
+           // Cache IDs in case the editor is reloaded before the change event is called. - #6028
+           var entityIDs = _entityIDs; // Delay change in case this change is blurring an edited combo. - #5878
 
-                   acc.add(entityID);
+           window.setTimeout(function () {
+             if (!_pendingChange) return;
+             dispatch$1.call('change', this, entityIDs, _pendingChange);
+             _pendingChange = null;
+           }, 10);
+         }
 
-                   var checkParentRels = [entity];
+         section.state = function (val) {
+           if (!arguments.length) return _state;
 
-                   if (entity.type === 'node') {
-                       graph.parentWays(entity).forEach(function(parentWay) {
-                           acc.add(parentWay.id); // include parent ways
-                           checkParentRels.push(parentWay);
-                       });
-                   } else if (entity.type === 'relation') {
-                       entity.members.forEach(function(member) {
-                           acc.add(member.id); // include members
-                       });
-                   } else if (entity.type === 'way') {
-                       entity.nodes.forEach(function(nodeID) {
-                           acc.add(nodeID); // include child nodes
-                           graph._parentWays[nodeID].forEach(function(wayID) {
-                               acc.add(wayID); // include connected ways
-                           });
-                       });
-                   }
+           if (_state !== val) {
+             _orderedKeys = [];
+             _state = val;
+           }
 
-                   checkParentRels.forEach(function(entity) {   // include parent relations
-                       if (entity.type !== 'relation') {        // but not super-relations
-                           graph.parentRelations(entity).forEach(function(parentRelation) {
-                               acc.add(parentRelation.id);
-                           });
-                       }
-                   });
+           return section;
+         };
 
-                   return acc;
+         section.presets = function (val) {
+           if (!arguments.length) return _presets;
+           _presets = val;
 
-               }, new Set());
+           if (_presets && _presets.length && _presets[0].isFallback()) {
+             section.disclosureExpanded(true); // don't collapse the disclosure if the mapper used the raw tag editor - #1881
+           } else if (!_didInteract) {
+             section.disclosureExpanded(null);
            }
 
-           //
-           // Run validation for several entities, supplied `entityIDs`,
-           // against `graph` for the given `cache`
-           //
-           function validateEntities(entityIDs, graph, cache) {
+           return section;
+         };
 
-               // clear caches for existing issues related to these entities
-               entityIDs.forEach(cache.uncacheEntityID);
+         section.tags = function (val) {
+           if (!arguments.length) return _tags;
+           _tags = val;
+           return section;
+         };
 
-               // detect new issues and update caches
-               entityIDs.forEach(function(entityID) {
-                   var entity = graph.hasEntity(entityID);
-                   // don't validate deleted entities
-                   if (!entity) return;
+         section.entityIDs = function (val) {
+           if (!arguments.length) return _entityIDs;
 
-                   var issues = validateEntity(entity, graph);
-                   cache.cacheIssues(issues);
-               });
+           if (!_entityIDs || !val || !utilArrayIdentical(_entityIDs, val)) {
+             _entityIDs = val;
+             _orderedKeys = [];
            }
 
+           return section;
+         }; // pass an array of regular expressions to test against the tag key
 
-           //
-           // Validates anything that has changed since the last time it was run.
-           // Also updates the "validatedGraph" to be the current graph
-           // and dispatches a `validated` event when finished.
-           //
-           validator.validate = function() {
 
-               var currGraph = context.graph();
-               _validatedGraph = _validatedGraph || context.history().base();
-               if (currGraph === _validatedGraph) {
-                   dispatch$1.call('validated');
-                   return;
-               }
-               var oldGraph = _validatedGraph;
-               var difference = coreDifference(oldGraph, currGraph);
-               _validatedGraph = currGraph;
+         section.readOnlyTags = function (val) {
+           if (!arguments.length) return _readOnlyTags;
+           _readOnlyTags = val;
+           return section;
+         };
 
-               var createdAndModifiedEntityIDs = difference.extantIDs(true);   // created/modified (true = w/relation members)
-               var entityIDsToCheck = entityIDsToValidate(createdAndModifiedEntityIDs, currGraph);
+         return utilRebind(section, dispatch$1, 'on');
+       }
 
-               // check modified and deleted entities against the old graph in order to update their related entities
-               // (e.g. deleting the only highway connected to a road should create a disconnected highway issue)
-               var modifiedAndDeletedEntityIDs = difference.deleted().concat(difference.modified())
-                   .map(function(entity) { return entity.id; });
-               var entityIDsToCheckForOldGraph = entityIDsToValidate(modifiedAndDeletedEntityIDs, oldGraph);
+       function uiDataEditor(context) {
+         var dataHeader = uiDataHeader();
+         var rawTagEditor = uiSectionRawTagEditor('custom-data-tag-editor', context).expandedByDefault(true).readOnlyTags([/./]);
 
-               // concat the sets
-               entityIDsToCheckForOldGraph.forEach(entityIDsToCheck.add, entityIDsToCheck);
+         var _datum;
 
-               validateEntities(entityIDsToCheck, context.graph(), _headCache);
+         function dataEditor(selection) {
+           var header = selection.selectAll('.header').data([0]);
+           var headerEnter = header.enter().append('div').attr('class', 'header fillL');
+           headerEnter.append('button').attr('class', 'close').on('click', function () {
+             context.enter(modeBrowse(context));
+           }).call(svgIcon('#iD-icon-close'));
+           headerEnter.append('h3').html(_t.html('map_data.title'));
+           var body = selection.selectAll('.body').data([0]);
+           body = body.enter().append('div').attr('class', 'body').merge(body);
+           var editor = body.selectAll('.data-editor').data([0]); // enter/update
 
-               dispatch$1.call('validated');
-           };
+           editor.enter().append('div').attr('class', 'modal-section data-editor').merge(editor).call(dataHeader.datum(_datum));
+           var rte = body.selectAll('.raw-tag-editor').data([0]); // enter/update
 
+           rte.enter().append('div').attr('class', 'raw-tag-editor data-editor').merge(rte).call(rawTagEditor.tags(_datum && _datum.properties || {}).state('hover').render).selectAll('textarea.tag-text').attr('readonly', true).classed('readonly', true);
+         }
 
-           // WHEN TO RUN VALIDATION:
-           // When graph changes:
-           context.history()
-               .on('restore.validator', validator.validate)   // restore saved history
-               .on('undone.validator', validator.validate)    // undo
-               .on('redone.validator', validator.validate);   // redo
-               // but not on 'change' (e.g. while drawing)
+         dataEditor.datum = function (val) {
+           if (!arguments.length) return _datum;
+           _datum = val;
+           return this;
+         };
 
-           // When user chages editing modes:
-           context
-               .on('exit.validator', validator.validate);
+         return dataEditor;
+       }
 
-           // When merging fetched data:
-           context.history()
-               .on('merge.validator', function(entities) {
-                   if (!entities) return;
-                   var handle = window.requestIdleCallback(function() {
-                       var entityIDs = entities.map(function(entity) { return entity.id; });
-                       var headGraph = context.graph();
-                       validateEntities(entityIDsToValidate(entityIDs, headGraph), headGraph, _headCache);
+       function modeSelectData(context, selectedDatum) {
+         var mode = {
+           id: 'select-data',
+           button: 'browse'
+         };
+         var keybinding = utilKeybinding('select-data');
+         var dataEditor = uiDataEditor(context);
+         var behaviors = [behaviorBreathe(), behaviorHover(context), behaviorSelect(context), behaviorLasso(context), modeDragNode(context).behavior, modeDragNote(context).behavior]; // class the data as selected, or return to browse mode if the data is gone
 
-                       var baseGraph = context.history().base();
-                       validateEntities(entityIDsToValidate(entityIDs, baseGraph), baseGraph, _baseCache);
+         function selectData(d3_event, drawn) {
+           var selection = context.surface().selectAll('.layer-mapdata .data' + selectedDatum.__featurehash__);
 
-                       dispatch$1.call('validated');
-                   });
-                   _deferred.add(handle);
-               });
+           if (selection.empty()) {
+             // Return to browse mode if selected DOM elements have
+             // disappeared because the user moved them out of view..
+             var source = d3_event && d3_event.type === 'zoom' && d3_event.sourceEvent;
 
+             if (drawn && source && (source.type === 'pointermove' || source.type === 'mousemove' || source.type === 'touchmove')) {
+               context.enter(modeBrowse(context));
+             }
+           } else {
+             selection.classed('selected', true);
+           }
+         }
 
-           return validator;
-       }
+         function esc() {
+           if (context.container().select('.combobox').size()) return;
+           context.enter(modeBrowse(context));
+         }
 
+         mode.zoomToSelected = function () {
+           var extent = geoExtent(d3_geoBounds(selectedDatum));
+           context.map().centerZoomEase(extent.center(), context.map().trimmedExtentZoom(extent));
+         };
 
-       function validationCache() {
+         mode.enter = function () {
+           behaviors.forEach(context.install);
+           keybinding.on(_t('inspector.zoom_to.key'), mode.zoomToSelected).on('⎋', esc, true);
+           select(document).call(keybinding);
+           selectData();
+           var sidebar = context.ui().sidebar;
+           sidebar.show(dataEditor.datum(selectedDatum)); // expand the sidebar, avoid obscuring the data if needed
 
-           var cache = {
-               issuesByIssueID: {},  // issue.id -> issue
-               issuesByEntityID: {} // entity.id -> set(issue.id)
-           };
+           var extent = geoExtent(d3_geoBounds(selectedDatum));
+           sidebar.expand(sidebar.intersects(extent));
+           context.map().on('drawn.select-data', selectData);
+         };
 
-           cache.cacheIssues = function(issues) {
-               issues.forEach(function(issue) {
-                   var entityIds = issue.entityIds || [];
-                   entityIds.forEach(function(entityId) {
-                       if (!cache.issuesByEntityID[entityId]) {
-                           cache.issuesByEntityID[entityId] = new Set();
-                       }
-                       cache.issuesByEntityID[entityId].add(issue.id);
-                   });
-                   cache.issuesByIssueID[issue.id] = issue;
-               });
-           };
+         mode.exit = function () {
+           behaviors.forEach(context.uninstall);
+           select(document).call(keybinding.unbind);
+           context.surface().selectAll('.layer-mapdata .selected').classed('selected hover', false);
+           context.map().on('drawn.select-data', null);
+           context.ui().sidebar.hide();
+         };
 
-           cache.uncacheIssue = function(issue) {
-               // When multiple entities are involved (e.g. crossing_ways),
-               // remove this issue from the other entity caches too..
-               var entityIds = issue.entityIds || [];
-               entityIds.forEach(function(entityId) {
-                   if (cache.issuesByEntityID[entityId]) {
-                       cache.issuesByEntityID[entityId].delete(issue.id);
-                   }
-               });
-               delete cache.issuesByIssueID[issue.id];
-           };
+         return mode;
+       }
 
-           cache.uncacheIssues = function(issues) {
-               issues.forEach(cache.uncacheIssue);
-           };
+       function uiImproveOsmComments() {
+         var _qaItem;
 
-           cache.uncacheIssuesOfType = function(type) {
-               var issuesOfType = Object.values(cache.issuesByIssueID)
-                   .filter(function(issue) { return issue.type === type; });
-               cache.uncacheIssues(issuesOfType);
-           };
+         function issueComments(selection) {
+           // make the div immediately so it appears above the buttons
+           var comments = selection.selectAll('.comments-container').data([0]);
+           comments = comments.enter().append('div').attr('class', 'comments-container').merge(comments); // must retrieve comments from API before they can be displayed
 
-           //
-           // Remove a single entity and all its related issues from the caches
-           //
-           cache.uncacheEntityID = function(entityID) {
-               var issueIDs = cache.issuesByEntityID[entityID];
-               if (!issueIDs) return;
-
-               issueIDs.forEach(function(issueID) {
-                   var issue = cache.issuesByIssueID[issueID];
-                   if (issue) {
-                       cache.uncacheIssue(issue);
-                   } else {
-                       delete cache.issuesByIssueID[issueID];
-                   }
+           services.improveOSM.getComments(_qaItem).then(function (d) {
+             if (!d.comments) return; // nothing to do here
+
+             var commentEnter = comments.selectAll('.comment').data(d.comments).enter().append('div').attr('class', 'comment');
+             commentEnter.append('div').attr('class', 'comment-avatar').call(svgIcon('#iD-icon-avatar', 'comment-avatar-icon'));
+             var mainEnter = commentEnter.append('div').attr('class', 'comment-main');
+             var metadataEnter = mainEnter.append('div').attr('class', 'comment-metadata');
+             metadataEnter.append('div').attr('class', 'comment-author').each(function (d) {
+               var osm = services.osm;
+               var selection = select(this);
+
+               if (osm && d.username) {
+                 selection = selection.append('a').attr('class', 'comment-author-link').attr('href', osm.userURL(d.username)).attr('target', '_blank');
+               }
+
+               selection.html(function (d) {
+                 return d.username;
                });
+             });
+             metadataEnter.append('div').attr('class', 'comment-date').html(function (d) {
+               return _t.html('note.status.commented', {
+                 when: localeDateString(d.timestamp)
+               });
+             });
+             mainEnter.append('div').attr('class', 'comment-text').append('p').html(function (d) {
+               return d.text;
+             });
+           })["catch"](function (err) {
+             console.log(err); // eslint-disable-line no-console
+           });
+         }
 
-               delete cache.issuesByEntityID[entityID];
+         function localeDateString(s) {
+           if (!s) return null;
+           var options = {
+             day: 'numeric',
+             month: 'short',
+             year: 'numeric'
            };
+           var d = new Date(s * 1000); // timestamp is served in seconds, date takes ms
+
+           if (isNaN(d.getTime())) return null;
+           return d.toLocaleDateString(_mainLocalizer.localeCode(), options);
+         }
+
+         issueComments.issue = function (val) {
+           if (!arguments.length) return _qaItem;
+           _qaItem = val;
+           return issueComments;
+         };
 
-           return cache;
+         return issueComments;
        }
 
-       function coreUploader(context) {
+       function uiImproveOsmDetails(context) {
+         var _qaItem;
 
-           var dispatch$1 = dispatch(
-               // Start and end events are dispatched exactly once each per legitimate outside call to `save`
-               'saveStarted', // dispatched as soon as a call to `save` has been deemed legitimate
-               'saveEnded',   // dispatched after the result event has been dispatched
+         function issueDetail(d) {
+           if (d.desc) return d.desc;
+           var issueKey = d.issueKey;
+           d.replacements = d.replacements || {};
+           d.replacements["default"] = _t.html('inspector.unknown'); // special key `default` works as a fallback string
 
-               'willAttemptUpload', // dispatched before the actual upload call occurs, if it will
-               'progressChanged',
+           return _t.html("QA.improveOSM.error_types.".concat(issueKey, ".description"), d.replacements);
+         }
 
-               // Each save results in one of these outcomes:
-               'resultNoChanges', // upload wasn't attempted since there were no edits
-               'resultErrors',    // upload failed due to errors
-               'resultConflicts', // upload failed due to data conflicts
-               'resultSuccess'    // upload completed without errors
-           );
+         function improveOsmDetails(selection) {
+           var details = selection.selectAll('.error-details').data(_qaItem ? [_qaItem] : [], function (d) {
+             return "".concat(d.id, "-").concat(d.status || 0);
+           });
+           details.exit().remove();
+           var detailsEnter = details.enter().append('div').attr('class', 'error-details qa-details-container'); // description
 
-           var _isSaving = false;
+           var descriptionEnter = detailsEnter.append('div').attr('class', 'qa-details-subsection');
+           descriptionEnter.append('h4').html(_t.html('QA.keepRight.detail_description'));
+           descriptionEnter.append('div').attr('class', 'qa-details-description-text').html(issueDetail); // If there are entity links in the error message..
 
-           var _conflicts = [];
-           var _errors = [];
-           var _origChanges;
+           var relatedEntities = [];
+           descriptionEnter.selectAll('.error_entity_link, .error_object_link').attr('href', '#').each(function () {
+             var link = select(this);
+             var isObjectLink = link.classed('error_object_link');
+             var entityID = isObjectLink ? utilEntityRoot(_qaItem.objectType) + _qaItem.objectId : this.textContent;
+             var entity = context.hasEntity(entityID);
+             relatedEntities.push(entityID); // Add click handler
 
-           var _discardTags = {};
-           _mainFileFetcher.get('discarded')
-               .then(function(d) { _discardTags = d; })
-               .catch(function() { /* ignore */ });
+             link.on('mouseenter', function () {
+               utilHighlightEntities([entityID], true, context);
+             }).on('mouseleave', function () {
+               utilHighlightEntities([entityID], false, context);
+             }).on('click', function (d3_event) {
+               d3_event.preventDefault();
+               utilHighlightEntities([entityID], false, context);
+               var osmlayer = context.layers().layer('osm');
 
-           var uploader = utilRebind({}, dispatch$1, 'on');
+               if (!osmlayer.enabled()) {
+                 osmlayer.enabled(true);
+               }
 
-           uploader.isSaving = function() {
-               return _isSaving;
-           };
+               context.map().centerZoom(_qaItem.loc, 20);
 
-           uploader.save = function(changeset, tryAgain, checkConflicts) {
-               // Guard against accidentally entering save code twice - #4641
-               if (_isSaving && !tryAgain) {
-                   return;
+               if (entity) {
+                 context.enter(modeSelect(context, [entityID]));
+               } else {
+                 context.loadEntity(entityID, function () {
+                   context.enter(modeSelect(context, [entityID]));
+                 });
                }
+             }); // Replace with friendly name if possible
+             // (The entity may not yet be loaded into the graph)
 
-               var osm = context.connection();
-               if (!osm) return;
+             if (entity) {
+               var name = utilDisplayName(entity); // try to use common name
 
-               // If user somehow got logged out mid-save, try to reauthenticate..
-               // This can happen if they were logged in from before, but the tokens are no longer valid.
-               if (!osm.authenticated()) {
-                   osm.authenticate(function(err) {
-                       if (!err) {
-                           uploader.save(changeset, tryAgain, checkConflicts);  // continue where we left off..
-                       }
-                   });
-                   return;
+               if (!name && !isObjectLink) {
+                 var preset = _mainPresetIndex.match(entity, context.graph());
+                 name = preset && !preset.isFallback() && preset.name(); // fallback to preset name
                }
 
-               if (!_isSaving) {
-                   _isSaving = true;
-                   dispatch$1.call('saveStarted', this);
+               if (name) {
+                 this.innerText = name;
                }
+             }
+           }); // Don't hide entities related to this error - #5880
 
-               var history = context.history();
+           context.features().forceVisible(relatedEntities);
+           context.map().pan([0, 0]); // trigger a redraw
+         }
+
+         improveOsmDetails.issue = function (val) {
+           if (!arguments.length) return _qaItem;
+           _qaItem = val;
+           return improveOsmDetails;
+         };
 
-               _conflicts = [];
-               _errors = [];
+         return improveOsmDetails;
+       }
 
-               // Store original changes, in case user wants to download them as an .osc file
-               _origChanges = history.changes(actionDiscardTags(history.difference(), _discardTags));
+       function uiImproveOsmHeader() {
+         var _qaItem;
 
-               // First time, `history.perform` a no-op action.
-               // Any conflict resolutions will be done as `history.replace`
-               // Remember to pop this later if needed
-               if (!tryAgain) {
-                   history.perform(actionNoop());
-               }
+         function issueTitle(d) {
+           var issueKey = d.issueKey;
+           d.replacements = d.replacements || {};
+           d.replacements["default"] = _t.html('inspector.unknown'); // special key `default` works as a fallback string
 
-               // Attempt a fast upload.. If there are conflicts, re-enter with `checkConflicts = true`
-               if (!checkConflicts) {
-                   upload(changeset);
+           return _t.html("QA.improveOSM.error_types.".concat(issueKey, ".title"), d.replacements);
+         }
 
-               // Do the full (slow) conflict check..
-               } else {
-                   performFullConflictCheck(changeset);
-               }
+         function improveOsmHeader(selection) {
+           var header = selection.selectAll('.qa-header').data(_qaItem ? [_qaItem] : [], function (d) {
+             return "".concat(d.id, "-").concat(d.status || 0);
+           });
+           header.exit().remove();
+           var headerEnter = header.enter().append('div').attr('class', 'qa-header');
+           var svgEnter = headerEnter.append('div').attr('class', 'qa-header-icon').classed('new', function (d) {
+             return d.id < 0;
+           }).append('svg').attr('width', '20px').attr('height', '30px').attr('viewbox', '0 0 20 30').attr('class', function (d) {
+             return "preset-icon-28 qaItem ".concat(d.service, " itemId-").concat(d.id, " itemType-").concat(d.itemType);
+           });
+           svgEnter.append('polygon').attr('fill', 'currentColor').attr('class', 'qaItem-fill').attr('points', '16,3 4,3 1,6 1,17 4,20 7,20 10,27 13,20 16,20 19,17.033 19,6');
+           svgEnter.append('use').attr('class', 'icon-annotation').attr('width', '13px').attr('height', '13px').attr('transform', 'translate(3.5, 5)').attr('xlink:href', function (d) {
+             var picon = d.icon;
 
-           };
+             if (!picon) {
+               return '';
+             } else {
+               var isMaki = /^maki-/.test(picon);
+               return "#".concat(picon).concat(isMaki ? '-11' : '');
+             }
+           });
+           headerEnter.append('div').attr('class', 'qa-header-label').html(issueTitle);
+         }
+
+         improveOsmHeader.issue = function (val) {
+           if (!arguments.length) return _qaItem;
+           _qaItem = val;
+           return improveOsmHeader;
+         };
+
+         return improveOsmHeader;
+       }
+
+       function uiImproveOsmEditor(context) {
+         var dispatch$1 = dispatch('change');
+         var qaDetails = uiImproveOsmDetails(context);
+         var qaComments = uiImproveOsmComments();
+         var qaHeader = uiImproveOsmHeader();
 
+         var _qaItem;
 
-           function performFullConflictCheck(changeset) {
+         function improveOsmEditor(selection) {
+           var headerEnter = selection.selectAll('.header').data([0]).enter().append('div').attr('class', 'header fillL');
+           headerEnter.append('button').attr('class', 'close').on('click', function () {
+             return context.enter(modeBrowse(context));
+           }).call(svgIcon('#iD-icon-close'));
+           headerEnter.append('h3').html(_t.html('QA.improveOSM.title'));
+           var body = selection.selectAll('.body').data([0]);
+           body = body.enter().append('div').attr('class', 'body').merge(body);
+           var editor = body.selectAll('.qa-editor').data([0]);
+           editor.enter().append('div').attr('class', 'modal-section qa-editor').merge(editor).call(qaHeader.issue(_qaItem)).call(qaDetails.issue(_qaItem)).call(qaComments.issue(_qaItem)).call(improveOsmSaveSection);
+         }
 
-               var osm = context.connection();
-               if (!osm) return;
+         function improveOsmSaveSection(selection) {
+           var isSelected = _qaItem && _qaItem.id === context.selectedErrorID();
 
-               var history = context.history();
+           var isShown = _qaItem && (isSelected || _qaItem.newComment || _qaItem.comment);
+           var saveSection = selection.selectAll('.qa-save').data(isShown ? [_qaItem] : [], function (d) {
+             return "".concat(d.id, "-").concat(d.status || 0);
+           }); // exit
 
-               var localGraph = context.graph();
-               var remoteGraph = coreGraph(history.base(), true);
+           saveSection.exit().remove(); // enter
 
-               var summary = history.difference().summary();
-               var _toCheck = [];
-               for (var i = 0; i < summary.length; i++) {
-                   var item = summary[i];
-                   if (item.changeType === 'modified') {
-                       _toCheck.push(item.entity.id);
-                   }
-               }
+           var saveSectionEnter = saveSection.enter().append('div').attr('class', 'qa-save save-section cf');
+           saveSectionEnter.append('h4').attr('class', '.qa-save-header').html(_t.html('note.newComment'));
+           saveSectionEnter.append('textarea').attr('class', 'new-comment-input').attr('placeholder', _t('QA.keepRight.comment_placeholder')).attr('maxlength', 1000).property('value', function (d) {
+             return d.newComment;
+           }).call(utilNoAuto).on('input', changeInput).on('blur', changeInput); // update
 
-               var _toLoad = withChildNodes(_toCheck, localGraph);
-               var _loaded = {};
-               var _toLoadCount = 0;
-               var _toLoadTotal = _toLoad.length;
+           saveSection = saveSectionEnter.merge(saveSection).call(qaSaveButtons);
 
-               if (_toCheck.length) {
-                   dispatch$1.call('progressChanged', this, _toLoadCount, _toLoadTotal);
-                   _toLoad.forEach(function(id) { _loaded[id] = false; });
-                   osm.loadMultiple(_toLoad, loaded);
-               } else {
-                   upload(changeset);
-               }
+           function changeInput() {
+             var input = select(this);
+             var val = input.property('value').trim();
 
-               return;
+             if (val === '') {
+               val = undefined;
+             } // store the unsaved comment with the issue itself
 
-               function withChildNodes(ids, graph) {
-                   var s = new Set(ids);
-                   ids.forEach(function(id) {
-                       var entity = graph.entity(id);
-                       if (entity.type !== 'way') return;
 
-                       graph.childNodes(entity).forEach(function(child) {
-                           if (child.version !== undefined) {
-                               s.add(child.id);
-                           }
-                       });
-                   });
+             _qaItem = _qaItem.update({
+               newComment: val
+             });
+             var qaService = services.improveOSM;
 
-                   return Array.from(s);
-               }
+             if (qaService) {
+               qaService.replaceItem(_qaItem);
+             }
 
+             saveSection.call(qaSaveButtons);
+           }
+         }
 
-               // Reload modified entities into an alternate graph and check for conflicts..
-               function loaded(err, result) {
-                   if (_errors.length) return;
+         function qaSaveButtons(selection) {
+           var isSelected = _qaItem && _qaItem.id === context.selectedErrorID();
 
-                   if (err) {
-                       _errors.push({
-                           msg: err.message || err.responseText,
-                           details: [ _t('save.status_code', { code: err.status }) ]
-                       });
-                       didResultInErrors();
+           var buttonSection = selection.selectAll('.buttons').data(isSelected ? [_qaItem] : [], function (d) {
+             return d.status + d.id;
+           }); // exit
 
-                   } else {
-                       var loadMore = [];
-
-                       result.data.forEach(function(entity) {
-                           remoteGraph.replace(entity);
-                           _loaded[entity.id] = true;
-                           _toLoad = _toLoad.filter(function(val) { return val !== entity.id; });
-
-                           if (!entity.visible) return;
-
-                           // Because loadMultiple doesn't download /full like loadEntity,
-                           // need to also load children that aren't already being checked..
-                           var i, id;
-                           if (entity.type === 'way') {
-                               for (i = 0; i < entity.nodes.length; i++) {
-                                   id = entity.nodes[i];
-                                   if (_loaded[id] === undefined) {
-                                       _loaded[id] = false;
-                                       loadMore.push(id);
-                                   }
-                               }
-                           } else if (entity.type === 'relation' && entity.isMultipolygon()) {
-                               for (i = 0; i < entity.members.length; i++) {
-                                   id = entity.members[i].id;
-                                   if (_loaded[id] === undefined) {
-                                       _loaded[id] = false;
-                                       loadMore.push(id);
-                                   }
-                               }
-                           }
-                       });
+           buttonSection.exit().remove(); // enter
 
-                       _toLoadCount += result.data.length;
-                       _toLoadTotal += loadMore.length;
-                       dispatch$1.call('progressChanged', this, _toLoadCount, _toLoadTotal);
+           var buttonEnter = buttonSection.enter().append('div').attr('class', 'buttons');
+           buttonEnter.append('button').attr('class', 'button comment-button action').html(_t.html('QA.keepRight.save_comment'));
+           buttonEnter.append('button').attr('class', 'button close-button action');
+           buttonEnter.append('button').attr('class', 'button ignore-button action'); // update
 
-                       if (loadMore.length) {
-                           _toLoad.push.apply(_toLoad, loadMore);
-                           osm.loadMultiple(loadMore, loaded);
-                       }
+           buttonSection = buttonSection.merge(buttonEnter);
+           buttonSection.select('.comment-button').attr('disabled', function (d) {
+             return d.newComment ? null : true;
+           }).on('click.comment', function (d3_event, d) {
+             this.blur(); // avoid keeping focus on the button - #4641
 
-                       if (!_toLoad.length) {
-                           detectConflicts();
-                           upload(changeset);
-                       }
-                   }
-               }
+             var qaService = services.improveOSM;
 
+             if (qaService) {
+               qaService.postUpdate(d, function (err, item) {
+                 return dispatch$1.call('change', item);
+               });
+             }
+           });
+           buttonSection.select('.close-button').html(function (d) {
+             var andComment = d.newComment ? '_comment' : '';
+             return _t.html("QA.keepRight.close".concat(andComment));
+           }).on('click.close', function (d3_event, d) {
+             this.blur(); // avoid keeping focus on the button - #4641
 
-               function detectConflicts() {
-                   function choice(id, text, action) {
-                       return {
-                           id: id,
-                           text: text,
-                           action: function() {
-                               history.replace(action);
-                           }
-                       };
-                   }
-                   function formatUser(d) {
-                       return '<a href="' + osm.userURL(d) + '" target="_blank">' + d + '</a>';
-                   }
-                   function entityName(entity) {
-                       return utilDisplayName(entity) || (utilDisplayType(entity.id) + ' ' + entity.id);
-                   }
+             var qaService = services.improveOSM;
 
-                   function sameVersions(local, remote) {
-                       if (local.version !== remote.version) return false;
+             if (qaService) {
+               d.newStatus = 'SOLVED';
+               qaService.postUpdate(d, function (err, item) {
+                 return dispatch$1.call('change', item);
+               });
+             }
+           });
+           buttonSection.select('.ignore-button').html(function (d) {
+             var andComment = d.newComment ? '_comment' : '';
+             return _t.html("QA.keepRight.ignore".concat(andComment));
+           }).on('click.ignore', function (d3_event, d) {
+             this.blur(); // avoid keeping focus on the button - #4641
 
-                       if (local.type === 'way') {
-                           var children = utilArrayUnion(local.nodes, remote.nodes);
-                           for (var i = 0; i < children.length; i++) {
-                               var a = localGraph.hasEntity(children[i]);
-                               var b = remoteGraph.hasEntity(children[i]);
-                               if (a && b && a.version !== b.version) return false;
-                           }
-                       }
+             var qaService = services.improveOSM;
 
-                       return true;
-                   }
+             if (qaService) {
+               d.newStatus = 'INVALID';
+               qaService.postUpdate(d, function (err, item) {
+                 return dispatch$1.call('change', item);
+               });
+             }
+           });
+         } // NOTE: Don't change method name until UI v3 is merged
 
-                   _toCheck.forEach(function(id) {
-                       var local = localGraph.entity(id);
-                       var remote = remoteGraph.entity(id);
 
-                       if (sameVersions(local, remote)) return;
+         improveOsmEditor.error = function (val) {
+           if (!arguments.length) return _qaItem;
+           _qaItem = val;
+           return improveOsmEditor;
+         };
 
-                       var merge = actionMergeRemoteChanges(id, localGraph, remoteGraph, _discardTags, formatUser);
+         return utilRebind(improveOsmEditor, dispatch$1, 'on');
+       }
 
-                       history.replace(merge);
+       function uiKeepRightDetails(context) {
+         var _qaItem;
 
-                       var mergeConflicts = merge.conflicts();
-                       if (!mergeConflicts.length) return;  // merged safely
+         function issueDetail(d) {
+           var itemType = d.itemType,
+               parentIssueType = d.parentIssueType;
+           var unknown = _t.html('inspector.unknown');
+           var replacements = d.replacements || {};
+           replacements["default"] = unknown; // special key `default` works as a fallback string
 
-                       var forceLocal = actionMergeRemoteChanges(id, localGraph, remoteGraph, _discardTags).withOption('force_local');
-                       var forceRemote = actionMergeRemoteChanges(id, localGraph, remoteGraph, _discardTags).withOption('force_remote');
-                       var keepMine = _t('save.conflict.' + (remote.visible ? 'keep_local' : 'restore'));
-                       var keepTheirs = _t('save.conflict.' + (remote.visible ? 'keep_remote' : 'delete'));
+           var detail = _t.html("QA.keepRight.errorTypes.".concat(itemType, ".description"), replacements);
 
-                       _conflicts.push({
-                           id: id,
-                           name: entityName(local),
-                           details: mergeConflicts,
-                           chosen: 1,
-                           choices: [
-                               choice(id, keepMine, forceLocal),
-                               choice(id, keepTheirs, forceRemote)
-                           ]
-                       });
-                   });
-               }
+           if (detail === unknown) {
+             detail = _t.html("QA.keepRight.errorTypes.".concat(parentIssueType, ".description"), replacements);
            }
 
+           return detail;
+         }
 
-           function upload(changeset) {
-               var osm = context.connection();
-               if (!osm) {
-                   _errors.push({ msg: 'No OSM Service' });
-               }
+         function keepRightDetails(selection) {
+           var details = selection.selectAll('.error-details').data(_qaItem ? [_qaItem] : [], function (d) {
+             return "".concat(d.id, "-").concat(d.status || 0);
+           });
+           details.exit().remove();
+           var detailsEnter = details.enter().append('div').attr('class', 'error-details qa-details-container'); // description
 
-               if (_conflicts.length) {
-                   didResultInConflicts(changeset);
+           var descriptionEnter = detailsEnter.append('div').attr('class', 'qa-details-subsection');
+           descriptionEnter.append('h4').html(_t.html('QA.keepRight.detail_description'));
+           descriptionEnter.append('div').attr('class', 'qa-details-description-text').html(issueDetail); // If there are entity links in the error message..
 
-               } else if (_errors.length) {
-                   didResultInErrors();
+           var relatedEntities = [];
+           descriptionEnter.selectAll('.error_entity_link, .error_object_link').attr('href', '#').each(function () {
+             var link = select(this);
+             var isObjectLink = link.classed('error_object_link');
+             var entityID = isObjectLink ? utilEntityRoot(_qaItem.objectType) + _qaItem.objectId : this.textContent;
+             var entity = context.hasEntity(entityID);
+             relatedEntities.push(entityID); // Add click handler
 
-               } else {
-                   var history = context.history();
-                   var changes = history.changes(actionDiscardTags(history.difference(), _discardTags));
-                   if (changes.modified.length || changes.created.length || changes.deleted.length) {
+             link.on('mouseenter', function () {
+               utilHighlightEntities([entityID], true, context);
+             }).on('mouseleave', function () {
+               utilHighlightEntities([entityID], false, context);
+             }).on('click', function (d3_event) {
+               d3_event.preventDefault();
+               utilHighlightEntities([entityID], false, context);
+               var osmlayer = context.layers().layer('osm');
 
-                       dispatch$1.call('willAttemptUpload', this);
+               if (!osmlayer.enabled()) {
+                 osmlayer.enabled(true);
+               }
 
-                       osm.putChangeset(changeset, changes, uploadCallback);
+               context.map().centerZoomEase(_qaItem.loc, 20);
 
-                   } else {
-                       // changes were insignificant or reverted by user
-                       didResultInNoChanges();
-                   }
+               if (entity) {
+                 context.enter(modeSelect(context, [entityID]));
+               } else {
+                 context.loadEntity(entityID, function () {
+                   context.enter(modeSelect(context, [entityID]));
+                 });
                }
-           }
+             }); // Replace with friendly name if possible
+             // (The entity may not yet be loaded into the graph)
 
+             if (entity) {
+               var name = utilDisplayName(entity); // try to use common name
 
-           function uploadCallback(err, changeset) {
-               if (err) {
-                   if (err.status === 409) {  // 409 Conflict
-                       uploader.save(changeset, true, true);  // tryAgain = true, checkConflicts = true
-                   } else {
-                       _errors.push({
-                           msg: err.message || err.responseText,
-                           details: [ _t('save.status_code', { code: err.status }) ]
-                       });
-                       didResultInErrors();
-                   }
-
-               } else {
-                   didResultInSuccess(changeset);
+               if (!name && !isObjectLink) {
+                 var preset = _mainPresetIndex.match(entity, context.graph());
+                 name = preset && !preset.isFallback() && preset.name(); // fallback to preset name
                }
-           }
 
-           function didResultInNoChanges() {
+               if (name) {
+                 this.innerText = name;
+               }
+             }
+           }); // Don't hide entities related to this issue - #5880
 
-               dispatch$1.call('resultNoChanges', this);
+           context.features().forceVisible(relatedEntities);
+           context.map().pan([0, 0]); // trigger a redraw
+         }
 
-               endSave();
+         keepRightDetails.issue = function (val) {
+           if (!arguments.length) return _qaItem;
+           _qaItem = val;
+           return keepRightDetails;
+         };
 
-               context.flush(); // reset iD
-           }
+         return keepRightDetails;
+       }
 
-           function didResultInErrors() {
+       function uiKeepRightHeader() {
+         var _qaItem;
 
-               context.history().pop();
+         function issueTitle(d) {
+           var itemType = d.itemType,
+               parentIssueType = d.parentIssueType;
+           var unknown = _t.html('inspector.unknown');
+           var replacements = d.replacements || {};
+           replacements["default"] = unknown; // special key `default` works as a fallback string
 
-               dispatch$1.call('resultErrors', this, _errors);
+           var title = _t.html("QA.keepRight.errorTypes.".concat(itemType, ".title"), replacements);
 
-               endSave();
+           if (title === unknown) {
+             title = _t.html("QA.keepRight.errorTypes.".concat(parentIssueType, ".title"), replacements);
            }
 
+           return title;
+         }
+
+         function keepRightHeader(selection) {
+           var header = selection.selectAll('.qa-header').data(_qaItem ? [_qaItem] : [], function (d) {
+             return "".concat(d.id, "-").concat(d.status || 0);
+           });
+           header.exit().remove();
+           var headerEnter = header.enter().append('div').attr('class', 'qa-header');
+           var iconEnter = headerEnter.append('div').attr('class', 'qa-header-icon').classed('new', function (d) {
+             return d.id < 0;
+           });
+           iconEnter.append('div').attr('class', function (d) {
+             return "preset-icon-28 qaItem ".concat(d.service, " itemId-").concat(d.id, " itemType-").concat(d.parentIssueType);
+           }).call(svgIcon('#iD-icon-bolt', 'qaItem-fill'));
+           headerEnter.append('div').attr('class', 'qa-header-label').html(issueTitle);
+         }
+
+         keepRightHeader.issue = function (val) {
+           if (!arguments.length) return _qaItem;
+           _qaItem = val;
+           return keepRightHeader;
+         };
 
-           function didResultInConflicts(changeset) {
+         return keepRightHeader;
+       }
 
-               _conflicts.sort(function(a, b) { return b.id.localeCompare(a.id); });
+       function uiViewOnKeepRight() {
+         var _qaItem;
 
-               dispatch$1.call('resultConflicts', this, changeset, _conflicts, _origChanges);
+         function viewOnKeepRight(selection) {
+           var url;
 
-               endSave();
+           if (services.keepRight && _qaItem instanceof QAItem) {
+             url = services.keepRight.issueURL(_qaItem);
            }
 
+           var link = selection.selectAll('.view-on-keepRight').data(url ? [url] : []); // exit
 
-           function didResultInSuccess(changeset) {
+           link.exit().remove(); // enter
 
-               // delete the edit stack cached to local storage
-               context.history().clearSaved();
-
-               dispatch$1.call('resultSuccess', this, changeset);
+           var linkEnter = link.enter().append('a').attr('class', 'view-on-keepRight').attr('target', '_blank').attr('rel', 'noopener') // security measure
+           .attr('href', function (d) {
+             return d;
+           }).call(svgIcon('#iD-icon-out-link', 'inline'));
+           linkEnter.append('span').html(_t.html('inspector.view_on_keepRight'));
+         }
 
-               // Add delay to allow for postgres replication #1646 #2678
-               window.setTimeout(function() {
+         viewOnKeepRight.what = function (val) {
+           if (!arguments.length) return _qaItem;
+           _qaItem = val;
+           return viewOnKeepRight;
+         };
 
-                   endSave();
+         return viewOnKeepRight;
+       }
 
-                   context.flush(); // reset iD
-               }, 2500);
-           }
+       function uiKeepRightEditor(context) {
+         var dispatch$1 = dispatch('change');
+         var qaDetails = uiKeepRightDetails(context);
+         var qaHeader = uiKeepRightHeader();
 
+         var _qaItem;
 
-           function endSave() {
-               _isSaving = false;
+         function keepRightEditor(selection) {
+           var headerEnter = selection.selectAll('.header').data([0]).enter().append('div').attr('class', 'header fillL');
+           headerEnter.append('button').attr('class', 'close').on('click', function () {
+             return context.enter(modeBrowse(context));
+           }).call(svgIcon('#iD-icon-close'));
+           headerEnter.append('h3').html(_t.html('QA.keepRight.title'));
+           var body = selection.selectAll('.body').data([0]);
+           body = body.enter().append('div').attr('class', 'body').merge(body);
+           var editor = body.selectAll('.qa-editor').data([0]);
+           editor.enter().append('div').attr('class', 'modal-section qa-editor').merge(editor).call(qaHeader.issue(_qaItem)).call(qaDetails.issue(_qaItem)).call(keepRightSaveSection);
+           var footer = selection.selectAll('.footer').data([0]);
+           footer.enter().append('div').attr('class', 'footer').merge(footer).call(uiViewOnKeepRight().what(_qaItem));
+         }
 
-               dispatch$1.call('saveEnded', this);
-           }
+         function keepRightSaveSection(selection) {
+           var isSelected = _qaItem && _qaItem.id === context.selectedErrorID();
 
+           var isShown = _qaItem && (isSelected || _qaItem.newComment || _qaItem.comment);
+           var saveSection = selection.selectAll('.qa-save').data(isShown ? [_qaItem] : [], function (d) {
+             return "".concat(d.id, "-").concat(d.status || 0);
+           }); // exit
 
-           uploader.cancelConflictResolution = function() {
-               context.history().pop();
-           };
+           saveSection.exit().remove(); // enter
 
+           var saveSectionEnter = saveSection.enter().append('div').attr('class', 'qa-save save-section cf');
+           saveSectionEnter.append('h4').attr('class', '.qa-save-header').html(_t.html('QA.keepRight.comment'));
+           saveSectionEnter.append('textarea').attr('class', 'new-comment-input').attr('placeholder', _t('QA.keepRight.comment_placeholder')).attr('maxlength', 1000).property('value', function (d) {
+             return d.newComment || d.comment;
+           }).call(utilNoAuto).on('input', changeInput).on('blur', changeInput); // update
 
-           uploader.processResolvedConflicts = function(changeset) {
-               var history = context.history();
+           saveSection = saveSectionEnter.merge(saveSection).call(qaSaveButtons);
 
-               for (var i = 0; i < _conflicts.length; i++) {
-                   if (_conflicts[i].chosen === 1) {  // user chose "use theirs"
-                       var entity = context.hasEntity(_conflicts[i].id);
-                       if (entity && entity.type === 'way') {
-                           var children = utilArrayUniq(entity.nodes);
-                           for (var j = 0; j < children.length; j++) {
-                               history.replace(actionRevert(children[j]));
-                           }
-                       }
-                       history.replace(actionRevert(_conflicts[i].id));
-                   }
-               }
+           function changeInput() {
+             var input = select(this);
+             var val = input.property('value').trim();
 
-               uploader.save(changeset, true, false);  // tryAgain = true, checkConflicts = false
-           };
+             if (val === _qaItem.comment) {
+               val = undefined;
+             } // store the unsaved comment with the issue itself
 
 
-           uploader.reset = function() {
+             _qaItem = _qaItem.update({
+               newComment: val
+             });
+             var qaService = services.keepRight;
 
-           };
+             if (qaService) {
+               qaService.replaceItem(_qaItem); // update keepright cache
+             }
 
+             saveSection.call(qaSaveButtons);
+           }
+         }
 
-           return uploader;
-       }
+         function qaSaveButtons(selection) {
+           var isSelected = _qaItem && _qaItem.id === context.selectedErrorID();
 
-       var isRetina = window.devicePixelRatio && window.devicePixelRatio >= 2;
+           var buttonSection = selection.selectAll('.buttons').data(isSelected ? [_qaItem] : [], function (d) {
+             return d.status + d.id;
+           }); // exit
 
-       // listen for DPI change, e.g. when dragging a browser window from a retina to non-retina screen
-       window.matchMedia(`
-        (-webkit-min-device-pixel-ratio: 2), /* Safari */
-        (min-resolution: 2dppx),             /* standard */
-        (min-resolution: 192dpi)             /* fallback */
-    `).addListener(function() {
+           buttonSection.exit().remove(); // enter
 
-           isRetina = window.devicePixelRatio && window.devicePixelRatio >= 2;
-       });
+           var buttonEnter = buttonSection.enter().append('div').attr('class', 'buttons');
+           buttonEnter.append('button').attr('class', 'button comment-button action').html(_t.html('QA.keepRight.save_comment'));
+           buttonEnter.append('button').attr('class', 'button close-button action');
+           buttonEnter.append('button').attr('class', 'button ignore-button action'); // update
 
+           buttonSection = buttonSection.merge(buttonEnter);
+           buttonSection.select('.comment-button') // select and propagate data
+           .attr('disabled', function (d) {
+             return d.newComment ? null : true;
+           }).on('click.comment', function (d3_event, d) {
+             this.blur(); // avoid keeping focus on the button - #4641
 
-       function localeDateString(s) {
-           if (!s) return null;
-           var options = { day: 'numeric', month: 'short', year: 'numeric' };
-           var d = new Date(s);
-           if (isNaN(d.getTime())) return null;
-           return d.toLocaleDateString(_mainLocalizer.localeCode(), options);
-       }
+             var qaService = services.keepRight;
 
-       function vintageRange(vintage) {
-           var s;
-           if (vintage.start || vintage.end) {
-               s = (vintage.start || '?');
-               if (vintage.start !== vintage.end) {
-                   s += ' - ' + (vintage.end || '?');
-               }
-           }
-           return s;
-       }
+             if (qaService) {
+               qaService.postUpdate(d, function (err, item) {
+                 return dispatch$1.call('change', item);
+               });
+             }
+           });
+           buttonSection.select('.close-button') // select and propagate data
+           .html(function (d) {
+             var andComment = d.newComment ? '_comment' : '';
+             return _t.html("QA.keepRight.close".concat(andComment));
+           }).on('click.close', function (d3_event, d) {
+             this.blur(); // avoid keeping focus on the button - #4641
 
+             var qaService = services.keepRight;
 
-       function rendererBackgroundSource(data) {
-           var source = Object.assign({}, data);   // shallow copy
-           var _offset = [0, 0];
-           var _name = source.name;
-           var _description = source.description;
-           var _best = !!source.best;
-           var _template = source.encrypted ? utilAesDecrypt(source.template) : source.template;
-
-           source.tileSize = data.tileSize || 256;
-           source.zoomExtent = data.zoomExtent || [0, 22];
-           source.overzoom = data.overzoom !== false;
-
-           source.offset = function(val) {
-               if (!arguments.length) return _offset;
-               _offset = val;
-               return source;
-           };
+             if (qaService) {
+               d.newStatus = 'ignore_t'; // ignore temporarily (item fixed)
 
+               qaService.postUpdate(d, function (err, item) {
+                 return dispatch$1.call('change', item);
+               });
+             }
+           });
+           buttonSection.select('.ignore-button') // select and propagate data
+           .html(function (d) {
+             var andComment = d.newComment ? '_comment' : '';
+             return _t.html("QA.keepRight.ignore".concat(andComment));
+           }).on('click.ignore', function (d3_event, d) {
+             this.blur(); // avoid keeping focus on the button - #4641
 
-           source.nudge = function(val, zoomlevel) {
-               _offset[0] += val[0] / Math.pow(2, zoomlevel);
-               _offset[1] += val[1] / Math.pow(2, zoomlevel);
-               return source;
-           };
+             var qaService = services.keepRight;
 
+             if (qaService) {
+               d.newStatus = 'ignore'; // ignore permanently (false positive)
 
-           source.name = function() {
-               var id_safe = source.id.replace(/\./g, '<TX_DOT>');
-               return _t('imagery.' + id_safe + '.name', { default: _name });
-           };
+               qaService.postUpdate(d, function (err, item) {
+                 return dispatch$1.call('change', item);
+               });
+             }
+           });
+         } // NOTE: Don't change method name until UI v3 is merged
 
 
-           source.description = function() {
-               var id_safe = source.id.replace(/\./g, '<TX_DOT>');
-               return _t('imagery.' + id_safe + '.description', { default: _description });
-           };
+         keepRightEditor.error = function (val) {
+           if (!arguments.length) return _qaItem;
+           _qaItem = val;
+           return keepRightEditor;
+         };
 
+         return utilRebind(keepRightEditor, dispatch$1, 'on');
+       }
 
-           source.best = function() {
-               return _best;
-           };
+       function uiOsmoseDetails(context) {
+         var _qaItem;
 
+         function issueString(d, type) {
+           if (!d) return ''; // Issue strings are cached from Osmose API
 
-           source.area = function() {
-               if (!data.polygon) return Number.MAX_VALUE;  // worldwide
-               var area = d3_geoArea({ type: 'MultiPolygon', coordinates: [ data.polygon ] });
-               return isNaN(area) ? 0 : area;
-           };
+           var s = services.osmose.getStrings(d.itemType);
+           return type in s ? s[type] : '';
+         }
 
+         function osmoseDetails(selection) {
+           var details = selection.selectAll('.error-details').data(_qaItem ? [_qaItem] : [], function (d) {
+             return "".concat(d.id, "-").concat(d.status || 0);
+           });
+           details.exit().remove();
+           var detailsEnter = details.enter().append('div').attr('class', 'error-details qa-details-container'); // Description
 
-           source.imageryUsed = function() {
-               return name || source.id;
-           };
+           if (issueString(_qaItem, 'detail')) {
+             var div = detailsEnter.append('div').attr('class', 'qa-details-subsection');
+             div.append('h4').html(_t.html('QA.keepRight.detail_description'));
+             div.append('p').attr('class', 'qa-details-description-text').html(function (d) {
+               return issueString(d, 'detail');
+             }).selectAll('a').attr('rel', 'noopener').attr('target', '_blank');
+           } // Elements (populated later as data is requested)
 
 
-           source.template = function(val) {
-               if (!arguments.length) return _template;
-               if (source.id === 'custom') {
-                   _template = val;
-               }
-               return source;
-           };
+           var detailsDiv = detailsEnter.append('div').attr('class', 'qa-details-subsection');
+           var elemsDiv = detailsEnter.append('div').attr('class', 'qa-details-subsection'); // Suggested Fix (mustn't exist for every issue type)
 
+           if (issueString(_qaItem, 'fix')) {
+             var _div = detailsEnter.append('div').attr('class', 'qa-details-subsection');
 
-           source.url = function(coord) {
-               var result = _template;
-               if (result === '') return result;   // source 'none'
+             _div.append('h4').html(_t.html('QA.osmose.fix_title'));
 
+             _div.append('p').html(function (d) {
+               return issueString(d, 'fix');
+             }).selectAll('a').attr('rel', 'noopener').attr('target', '_blank');
+           } // Common Pitfalls (mustn't exist for every issue type)
 
-               // Guess a type based on the tokens present in the template
-               // (This is for 'custom' source, where we don't know)
-               if (!source.type) {
-                   if (/\{(proj|wkid|bbox)\}/.test(_template)) {
-                       source.type = 'wms';
-                       source.projection = 'EPSG:3857';  // guess
-                   } else if (/\{(x|y)\}/.test(_template)) {
-                       source.type = 'tms';
-                   } else if (/\{u\}/.test(_template)) {
-                       source.type = 'bing';
-                   }
-               }
 
+           if (issueString(_qaItem, 'trap')) {
+             var _div2 = detailsEnter.append('div').attr('class', 'qa-details-subsection');
 
-               if (source.type === 'wms') {
-                   var tileToProjectedCoords = (function(x, y, z) {
-                       //polyfill for IE11, PhantomJS
-                       var sinh = Math.sinh || function(x) {
-                           var y = Math.exp(x);
-                           return (y - 1 / y) / 2;
-                       };
+             _div2.append('h4').html(_t.html('QA.osmose.trap_title'));
 
-                       var zoomSize = Math.pow(2, z);
-                       var lon = x / zoomSize * Math.PI * 2 - Math.PI;
-                       var lat = Math.atan(sinh(Math.PI * (1 - 2 * y / zoomSize)));
-
-                       switch (source.projection) {
-                           case 'EPSG:4326':
-                               return {
-                                   x: lon * 180 / Math.PI,
-                                   y: lat * 180 / Math.PI
-                               };
-                           default: // EPSG:3857 and synonyms
-                               var mercCoords = mercatorRaw(lon, lat);
-                               return {
-                                   x: 20037508.34 / Math.PI * mercCoords[0],
-                                   y: 20037508.34 / Math.PI * mercCoords[1]
-                               };
-                       }
-                   });
+             _div2.append('p').html(function (d) {
+               return issueString(d, 'trap');
+             }).selectAll('a').attr('rel', 'noopener').attr('target', '_blank');
+           } // Save current item to check if UI changed by time request resolves
 
-                   var tileSize = source.tileSize;
-                   var projection = source.projection;
-                   var minXmaxY = tileToProjectedCoords(coord[0], coord[1], coord[2]);
-                   var maxXminY = tileToProjectedCoords(coord[0]+1, coord[1]+1, coord[2]);
-
-                   result = result.replace(/\{(\w+)\}/g, function (token, key) {
-                     switch (key) {
-                       case 'width':
-                       case 'height':
-                         return tileSize;
-                       case 'proj':
-                         return projection;
-                       case 'wkid':
-                         return projection.replace(/^EPSG:/, '');
-                       case 'bbox':
-                         return minXmaxY.x + ',' + maxXminY.y + ',' + maxXminY.x + ',' + minXmaxY.y;
-                       case 'w':
-                         return minXmaxY.x;
-                       case 's':
-                         return maxXminY.y;
-                       case 'n':
-                         return maxXminY.x;
-                       case 'e':
-                         return minXmaxY.y;
-                       default:
-                         return token;
-                     }
-                   });
 
-               } else if (source.type === 'tms') {
-                   result = result
-                       .replace('{x}', coord[0])
-                       .replace('{y}', coord[1])
-                       // TMS-flipped y coordinate
-                       .replace(/\{[t-]y\}/, Math.pow(2, coord[2]) - coord[1] - 1)
-                       .replace(/\{z(oom)?\}/, coord[2])
-                       // only fetch retina tiles for retina screens
-                       .replace(/\{@2x\}|\{r\}/, isRetina ? '@2x' : '');
-
-               } else if (source.type === 'bing') {
-                   result = result
-                       .replace('{u}', function() {
-                           var u = '';
-                           for (var zoom = coord[2]; zoom > 0; zoom--) {
-                               var b = 0;
-                               var mask = 1 << (zoom - 1);
-                               if ((coord[0] & mask) !== 0) b++;
-                               if ((coord[1] & mask) !== 0) b += 2;
-                               u += b.toString();
-                           }
-                           return u;
-                       });
-               }
+           var thisItem = _qaItem;
+           services.osmose.loadIssueDetail(_qaItem).then(function (d) {
+             // No details to add if there are no associated issue elements
+             if (!d.elems || d.elems.length === 0) return; // Do nothing if UI has moved on by the time this resolves
 
-               // these apply to any type..
-               result = result.replace(/\{switch:([^}]+)\}/, function(s, r) {
-                   var subdomains = r.split(',');
-                   return subdomains[(coord[0] + coord[1]) % subdomains.length];
-               });
+             if (context.selectedErrorID() !== thisItem.id && context.container().selectAll(".qaItem.osmose.hover.itemId-".concat(thisItem.id)).empty()) return; // Things like keys and values are dynamically added to a subtitle string
 
+             if (d.detail) {
+               detailsDiv.append('h4').html(_t.html('QA.osmose.detail_title'));
+               detailsDiv.append('p').html(function (d) {
+                 return d.detail;
+               }).selectAll('a').attr('rel', 'noopener').attr('target', '_blank');
+             } // Create list of linked issue elements
 
-               return result;
-           };
 
+             elemsDiv.append('h4').html(_t.html('QA.osmose.elems_title'));
+             elemsDiv.append('ul').selectAll('li').data(d.elems).enter().append('li').append('a').attr('href', '#').attr('class', 'error_entity_link').html(function (d) {
+               return d;
+             }).each(function () {
+               var link = select(this);
+               var entityID = this.textContent;
+               var entity = context.hasEntity(entityID); // Add click handler
+
+               link.on('mouseenter', function () {
+                 utilHighlightEntities([entityID], true, context);
+               }).on('mouseleave', function () {
+                 utilHighlightEntities([entityID], false, context);
+               }).on('click', function (d3_event) {
+                 d3_event.preventDefault();
+                 utilHighlightEntities([entityID], false, context);
+                 var osmlayer = context.layers().layer('osm');
+
+                 if (!osmlayer.enabled()) {
+                   osmlayer.enabled(true);
+                 }
 
-           source.validZoom = function(z) {
-               return source.zoomExtent[0] <= z &&
-                   (source.overzoom || source.zoomExtent[1] > z);
-           };
+                 context.map().centerZoom(d.loc, 20);
 
+                 if (entity) {
+                   context.enter(modeSelect(context, [entityID]));
+                 } else {
+                   context.loadEntity(entityID, function () {
+                     context.enter(modeSelect(context, [entityID]));
+                   });
+                 }
+               }); // Replace with friendly name if possible
+               // (The entity may not yet be loaded into the graph)
 
-           source.isLocatorOverlay = function() {
-               return source.id === 'mapbox_locator_overlay';
-           };
+               if (entity) {
+                 var name = utilDisplayName(entity); // try to use common name
 
+                 if (!name) {
+                   var preset = _mainPresetIndex.match(entity, context.graph());
+                   name = preset && !preset.isFallback() && preset.name(); // fallback to preset name
+                 }
 
-           /* hides a source from the list, but leaves it available for use */
-           source.isHidden = function() {
-               return source.id === 'DigitalGlobe-Premium-vintage' ||
-                   source.id === 'DigitalGlobe-Standard-vintage';
-           };
+                 if (name) {
+                   this.innerText = name;
+                 }
+               }
+             }); // Don't hide entities related to this issue - #5880
 
+             context.features().forceVisible(d.elems);
+             context.map().pan([0, 0]); // trigger a redraw
+           })["catch"](function (err) {
+             console.log(err); // eslint-disable-line no-console
+           });
+         }
 
-           source.copyrightNotices = function() {};
+         osmoseDetails.issue = function (val) {
+           if (!arguments.length) return _qaItem;
+           _qaItem = val;
+           return osmoseDetails;
+         };
 
+         return osmoseDetails;
+       }
 
-           source.getMetadata = function(center, tileCoord, callback) {
-               var vintage = {
-                   start: localeDateString(source.startDate),
-                   end: localeDateString(source.endDate)
-               };
-               vintage.range = vintageRange(vintage);
+       function uiOsmoseHeader() {
+         var _qaItem;
 
-               var metadata = { vintage: vintage };
-               callback(null, metadata);
-           };
+         function issueTitle(d) {
+           var unknown = _t('inspector.unknown');
+           if (!d) return unknown; // Issue titles supplied by Osmose
 
+           var s = services.osmose.getStrings(d.itemType);
+           return 'title' in s ? s.title : unknown;
+         }
 
-           return source;
-       }
+         function osmoseHeader(selection) {
+           var header = selection.selectAll('.qa-header').data(_qaItem ? [_qaItem] : [], function (d) {
+             return "".concat(d.id, "-").concat(d.status || 0);
+           });
+           header.exit().remove();
+           var headerEnter = header.enter().append('div').attr('class', 'qa-header');
+           var svgEnter = headerEnter.append('div').attr('class', 'qa-header-icon').classed('new', function (d) {
+             return d.id < 0;
+           }).append('svg').attr('width', '20px').attr('height', '30px').attr('viewbox', '0 0 20 30').attr('class', function (d) {
+             return "preset-icon-28 qaItem ".concat(d.service, " itemId-").concat(d.id, " itemType-").concat(d.itemType);
+           });
+           svgEnter.append('polygon').attr('fill', function (d) {
+             return services.osmose.getColor(d.item);
+           }).attr('class', 'qaItem-fill').attr('points', '16,3 4,3 1,6 1,17 4,20 7,20 10,27 13,20 16,20 19,17.033 19,6');
+           svgEnter.append('use').attr('class', 'icon-annotation').attr('width', '13px').attr('height', '13px').attr('transform', 'translate(3.5, 5)').attr('xlink:href', function (d) {
+             var picon = d.icon;
 
+             if (!picon) {
+               return '';
+             } else {
+               var isMaki = /^maki-/.test(picon);
+               return "#".concat(picon).concat(isMaki ? '-11' : '');
+             }
+           });
+           headerEnter.append('div').attr('class', 'qa-header-label').html(issueTitle);
+         }
 
-       rendererBackgroundSource.Bing = function(data, dispatch) {
-           // http://msdn.microsoft.com/en-us/library/ff701716.aspx
-           // http://msdn.microsoft.com/en-us/library/ff701701.aspx
+         osmoseHeader.issue = function (val) {
+           if (!arguments.length) return _qaItem;
+           _qaItem = val;
+           return osmoseHeader;
+         };
 
-           data.template = 'https://ecn.t{switch:0,1,2,3}.tiles.virtualearth.net/tiles/a{u}.jpeg?g=587&mkt=en-gb&n=z';
+         return osmoseHeader;
+       }
 
-           var bing = rendererBackgroundSource(data);
-           // var key = 'Arzdiw4nlOJzRwOz__qailc8NiR31Tt51dN2D7cm57NrnceZnCpgOkmJhNpGoppU'; // P2, JOSM, etc
-           var key = 'Ak5oTE46TUbjRp08OFVcGpkARErDobfpuyNKa-W2mQ8wbt1K1KL8p1bIRwWwcF-Q';    // iD
+       function uiViewOnOsmose() {
+         var _qaItem;
 
+         function viewOnOsmose(selection) {
+           var url;
 
-           var url = 'https://dev.virtualearth.net/REST/v1/Imagery/Metadata/Aerial?include=ImageryProviders&key=' + key;
-           var cache = {};
-           var inflight = {};
-           var providers = [];
+           if (services.osmose && _qaItem instanceof QAItem) {
+             url = services.osmose.itemURL(_qaItem);
+           }
 
-           d3_json(url)
-               .then(function(json) {
-                   providers = json.resourceSets[0].resources[0].imageryProviders.map(function(provider) {
-                       return {
-                           attribution: provider.attribution,
-                           areas: provider.coverageAreas.map(function(area) {
-                               return {
-                                   zoom: [area.zoomMin, area.zoomMax],
-                                   extent: geoExtent([area.bbox[1], area.bbox[0]], [area.bbox[3], area.bbox[2]])
-                               };
-                           })
-                       };
-                   });
-                   dispatch.call('change');
-               })
-               .catch(function() {
-                   /* ignore */
-               });
+           var link = selection.selectAll('.view-on-osmose').data(url ? [url] : []); // exit
 
+           link.exit().remove(); // enter
 
-           bing.copyrightNotices = function(zoom, extent) {
-               zoom = Math.min(zoom, 21);
-               return providers.filter(function(provider) {
-                   return provider.areas.some(function(area) {
-                       return extent.intersects(area.extent) &&
-                           area.zoom[0] <= zoom &&
-                           area.zoom[1] >= zoom;
-                   });
-               }).map(function(provider) {
-                   return provider.attribution;
-               }).join(', ');
-           };
+           var linkEnter = link.enter().append('a').attr('class', 'view-on-osmose').attr('target', '_blank').attr('rel', 'noopener') // security measure
+           .attr('href', function (d) {
+             return d;
+           }).call(svgIcon('#iD-icon-out-link', 'inline'));
+           linkEnter.append('span').html(_t.html('inspector.view_on_osmose'));
+         }
 
+         viewOnOsmose.what = function (val) {
+           if (!arguments.length) return _qaItem;
+           _qaItem = val;
+           return viewOnOsmose;
+         };
 
-           bing.getMetadata = function(center, tileCoord, callback) {
-               var tileID = tileCoord.slice(0, 3).join('/');
-               var zoom = Math.min(tileCoord[2], 21);
-               var centerPoint = center[1] + ',' + center[0];  // lat,lng
-               var url = 'https://dev.virtualearth.net/REST/v1/Imagery/Metadata/Aerial/' + centerPoint +
-                       '?zl=' + zoom + '&key=' + key;
+         return viewOnOsmose;
+       }
 
-               if (inflight[tileID]) return;
+       function uiOsmoseEditor(context) {
+         var dispatch$1 = dispatch('change');
+         var qaDetails = uiOsmoseDetails(context);
+         var qaHeader = uiOsmoseHeader();
 
-               if (!cache[tileID]) {
-                   cache[tileID] = {};
-               }
-               if (cache[tileID] && cache[tileID].metadata) {
-                   return callback(null, cache[tileID].metadata);
-               }
+         var _qaItem;
 
-               inflight[tileID] = true;
-               d3_json(url)
-                   .then(function(result) {
-                       delete inflight[tileID];
-                       if (!result) {
-                           throw new Error('Unknown Error');
-                       }
-                       var vintage = {
-                           start: localeDateString(result.resourceSets[0].resources[0].vintageStart),
-                           end: localeDateString(result.resourceSets[0].resources[0].vintageEnd)
-                       };
-                       vintage.range = vintageRange(vintage);
-
-                       var metadata = { vintage: vintage };
-                       cache[tileID].metadata = metadata;
-                       if (callback) callback(null, metadata);
-                   })
-                   .catch(function(err) {
-                       delete inflight[tileID];
-                       if (callback) callback(err.message);
-                   });
-           };
+         function osmoseEditor(selection) {
+           var header = selection.selectAll('.header').data([0]);
+           var headerEnter = header.enter().append('div').attr('class', 'header fillL');
+           headerEnter.append('button').attr('class', 'close').on('click', function () {
+             return context.enter(modeBrowse(context));
+           }).call(svgIcon('#iD-icon-close'));
+           headerEnter.append('h3').html(_t.html('QA.osmose.title'));
+           var body = selection.selectAll('.body').data([0]);
+           body = body.enter().append('div').attr('class', 'body').merge(body);
+           var editor = body.selectAll('.qa-editor').data([0]);
+           editor.enter().append('div').attr('class', 'modal-section qa-editor').merge(editor).call(qaHeader.issue(_qaItem)).call(qaDetails.issue(_qaItem)).call(osmoseSaveSection);
+           var footer = selection.selectAll('.footer').data([0]);
+           footer.enter().append('div').attr('class', 'footer').merge(footer).call(uiViewOnOsmose().what(_qaItem));
+         }
 
+         function osmoseSaveSection(selection) {
+           var isSelected = _qaItem && _qaItem.id === context.selectedErrorID();
 
-           bing.terms_url = 'https://blog.openstreetmap.org/2010/11/30/microsoft-imagery-details';
+           var isShown = _qaItem && isSelected;
+           var saveSection = selection.selectAll('.qa-save').data(isShown ? [_qaItem] : [], function (d) {
+             return "".concat(d.id, "-").concat(d.status || 0);
+           }); // exit
 
+           saveSection.exit().remove(); // enter
 
-           return bing;
-       };
+           var saveSectionEnter = saveSection.enter().append('div').attr('class', 'qa-save save-section cf'); // update
 
+           saveSection = saveSectionEnter.merge(saveSection).call(qaSaveButtons);
+         }
 
+         function qaSaveButtons(selection) {
+           var isSelected = _qaItem && _qaItem.id === context.selectedErrorID();
 
-       rendererBackgroundSource.Esri = function(data) {
-           // in addition to using the tilemap at zoom level 20, overzoom real tiles - #4327 (deprecated technique, but it works)
-           if (data.template.match(/blankTile/) === null) {
-               data.template = data.template + '?blankTile=false';
-           }
+           var buttonSection = selection.selectAll('.buttons').data(isSelected ? [_qaItem] : [], function (d) {
+             return d.status + d.id;
+           }); // exit
 
-           var esri = rendererBackgroundSource(data);
-           var cache = {};
-           var inflight = {};
-           var _prevCenter;
+           buttonSection.exit().remove(); // enter
 
-           // use a tilemap service to set maximum zoom for esri tiles dynamically
-           // https://developers.arcgis.com/documentation/tiled-elevation-service/
-           esri.fetchTilemap = function(center) {
-               // skip if we have already fetched a tilemap within 5km
-               if (_prevCenter && geoSphericalDistance(center, _prevCenter) < 5000) return;
-               _prevCenter = center;
+           var buttonEnter = buttonSection.enter().append('div').attr('class', 'buttons');
+           buttonEnter.append('button').attr('class', 'button close-button action');
+           buttonEnter.append('button').attr('class', 'button ignore-button action'); // update
 
-               // tiles are available globally to zoom level 19, afterward they may or may not be present
-               var z = 20;
+           buttonSection = buttonSection.merge(buttonEnter);
+           buttonSection.select('.close-button').html(_t.html('QA.keepRight.close')).on('click.close', function (d3_event, d) {
+             this.blur(); // avoid keeping focus on the button - #4641
 
-               // first generate a random url using the template
-               var dummyUrl = esri.url([1,2,3]);
+             var qaService = services.osmose;
 
-               // calculate url z/y/x from the lat/long of the center of the map
-               var x = (Math.floor((center[0] + 180) / 360 * Math.pow(2, z)));
-               var y = (Math.floor((1 - Math.log(Math.tan(center[1] * Math.PI / 180) + 1 / Math.cos(center[1] * Math.PI / 180)) / Math.PI) / 2 * Math.pow(2, z)));
+             if (qaService) {
+               d.newStatus = 'done';
+               qaService.postUpdate(d, function (err, item) {
+                 return dispatch$1.call('change', item);
+               });
+             }
+           });
+           buttonSection.select('.ignore-button').html(_t.html('QA.keepRight.ignore')).on('click.ignore', function (d3_event, d) {
+             this.blur(); // avoid keeping focus on the button - #4641
 
-               // fetch an 8x8 grid to leverage cache
-               var tilemapUrl = dummyUrl.replace(/tile\/[0-9]+\/[0-9]+\/[0-9]+\?blankTile=false/, 'tilemap') + '/' + z + '/' + y + '/' + x + '/8/8';
+             var qaService = services.osmose;
 
-               // make the request and introspect the response from the tilemap server
-               d3_json(tilemapUrl)
-                   .then(function(tilemap) {
-                       if (!tilemap) {
-                           throw new Error('Unknown Error');
-                       }
-                       var hasTiles = true;
-                       for (var i = 0; i < tilemap.data.length; i++) {
-                           // 0 means an individual tile in the grid doesn't exist
-                           if (!tilemap.data[i]) {
-                               hasTiles = false;
-                               break;
-                           }
-                       }
+             if (qaService) {
+               d.newStatus = 'false';
+               qaService.postUpdate(d, function (err, item) {
+                 return dispatch$1.call('change', item);
+               });
+             }
+           });
+         } // NOTE: Don't change method name until UI v3 is merged
 
-                       // if any tiles are missing at level 20 we restrict maxZoom to 19
-                       esri.zoomExtent[1] = (hasTiles ? 22 : 19);
-                   })
-                   .catch(function() {
-                       /* ignore */
-                   });
-           };
 
+         osmoseEditor.error = function (val) {
+           if (!arguments.length) return _qaItem;
+           _qaItem = val;
+           return osmoseEditor;
+         };
 
-           esri.getMetadata = function(center, tileCoord, callback) {
-               var tileID = tileCoord.slice(0, 3).join('/');
-               var zoom = Math.min(tileCoord[2], esri.zoomExtent[1]);
-               var centerPoint = center[0] + ',' + center[1];  // long, lat (as it should be)
-               var unknown = _t('info_panels.background.unknown');
-               var metadataLayer;
-               var vintage = {};
-               var metadata = {};
+         return utilRebind(osmoseEditor, dispatch$1, 'on');
+       }
 
-               if (inflight[tileID]) return;
+       function modeSelectError(context, selectedErrorID, selectedErrorService) {
+         var mode = {
+           id: 'select-error',
+           button: 'browse'
+         };
+         var keybinding = utilKeybinding('select-error');
+         var errorService = services[selectedErrorService];
+         var errorEditor;
 
-               switch (true) {
-                   case (zoom >= 20 && esri.id === 'EsriWorldImageryClarity'):
-                       metadataLayer = 4;
-                       break;
-                   case zoom >= 19:
-                       metadataLayer = 3;
-                       break;
-                   case zoom >= 17:
-                       metadataLayer = 2;
-                       break;
-                   case zoom >= 13:
-                       metadataLayer = 0;
-                       break;
-                   default:
-                       metadataLayer = 99;
-               }
+         switch (selectedErrorService) {
+           case 'improveOSM':
+             errorEditor = uiImproveOsmEditor(context).on('change', function () {
+               context.map().pan([0, 0]); // trigger a redraw
 
-               var url;
-               // build up query using the layer appropriate to the current zoom
-               if (esri.id === 'EsriWorldImagery') {
-                   url = 'https://services.arcgisonline.com/arcgis/rest/services/World_Imagery/MapServer/';
-               } else if (esri.id === 'EsriWorldImageryClarity') {
-                   url = 'https://serviceslab.arcgisonline.com/arcgis/rest/services/Clarity_World_Imagery/MapServer/';
-               }
+               var error = checkSelectedID();
+               if (!error) return;
+               context.ui().sidebar.show(errorEditor.error(error));
+             });
+             break;
 
-               url += metadataLayer + '/query?returnGeometry=false&geometry=' + centerPoint + '&inSR=4326&geometryType=esriGeometryPoint&outFields=*&f=json';
+           case 'keepRight':
+             errorEditor = uiKeepRightEditor(context).on('change', function () {
+               context.map().pan([0, 0]); // trigger a redraw
 
-               if (!cache[tileID]) {
-                   cache[tileID] = {};
-               }
-               if (cache[tileID] && cache[tileID].metadata) {
-                   return callback(null, cache[tileID].metadata);
-               }
+               var error = checkSelectedID();
+               if (!error) return;
+               context.ui().sidebar.show(errorEditor.error(error));
+             });
+             break;
 
-               // accurate metadata is only available >= 13
-               if (metadataLayer === 99) {
-                   vintage = {
-                       start: null,
-                       end: null,
-                       range: null
-                   };
-                   metadata = {
-                       vintage: null,
-                       source: unknown,
-                       description: unknown,
-                       resolution: unknown,
-                       accuracy: unknown
-                   };
+           case 'osmose':
+             errorEditor = uiOsmoseEditor(context).on('change', function () {
+               context.map().pan([0, 0]); // trigger a redraw
 
-                   callback(null, metadata);
+               var error = checkSelectedID();
+               if (!error) return;
+               context.ui().sidebar.show(errorEditor.error(error));
+             });
+             break;
+         }
 
-               } else {
-                   inflight[tileID] = true;
-                   d3_json(url)
-                       .then(function(result) {
-                           delete inflight[tileID];
-                           if (!result) {
-                               throw new Error('Unknown Error');
-                           } else if (result.features && result.features.length < 1) {
-                               throw new Error('No Results');
-                           } else if (result.error && result.error.message) {
-                               throw new Error(result.error.message);
-                           }
+         var behaviors = [behaviorBreathe(), behaviorHover(context), behaviorSelect(context), behaviorLasso(context), modeDragNode(context).behavior, modeDragNote(context).behavior];
 
-                           // pass through the discrete capture date from metadata
-                           var captureDate = localeDateString(result.features[0].attributes.SRC_DATE2);
-                           vintage = {
-                               start: captureDate,
-                               end: captureDate,
-                               range: captureDate
-                           };
-                           metadata = {
-                               vintage: vintage,
-                               source: clean(result.features[0].attributes.NICE_NAME),
-                               description: clean(result.features[0].attributes.NICE_DESC),
-                               resolution: clean(+parseFloat(result.features[0].attributes.SRC_RES).toFixed(4)),
-                               accuracy: clean(+parseFloat(result.features[0].attributes.SRC_ACC).toFixed(4))
-                           };
-
-                           // append units - meters
-                           if (isFinite(metadata.resolution)) {
-                               metadata.resolution += ' m';
-                           }
-                           if (isFinite(metadata.accuracy)) {
-                               metadata.accuracy += ' m';
-                           }
+         function checkSelectedID() {
+           if (!errorService) return;
+           var error = errorService.getError(selectedErrorID);
 
-                           cache[tileID].metadata = metadata;
-                           if (callback) callback(null, metadata);
-                       })
-                       .catch(function(err) {
-                           delete inflight[tileID];
-                           if (callback) callback(err.message);
-                       });
-               }
+           if (!error) {
+             context.enter(modeBrowse(context));
+           }
 
+           return error;
+         }
 
-               function clean(val) {
-                   return String(val).trim() || unknown;
-               }
-           };
+         mode.zoomToSelected = function () {
+           if (!errorService) return;
+           var error = errorService.getError(selectedErrorID);
 
-           return esri;
-       };
+           if (error) {
+             context.map().centerZoomEase(error.loc, 20);
+           }
+         };
 
+         mode.enter = function () {
+           var error = checkSelectedID();
+           if (!error) return;
+           behaviors.forEach(context.install);
+           keybinding.on(_t('inspector.zoom_to.key'), mode.zoomToSelected).on('⎋', esc, true);
+           select(document).call(keybinding);
+           selectError();
+           var sidebar = context.ui().sidebar;
+           sidebar.show(errorEditor.error(error));
+           context.map().on('drawn.select-error', selectError); // class the error as selected, or return to browse mode if the error is gone
 
-       rendererBackgroundSource.None = function() {
-           var source = rendererBackgroundSource({ id: 'none', template: '' });
+           function selectError(d3_event, drawn) {
+             if (!checkSelectedID()) return;
+             var selection = context.surface().selectAll('.itemId-' + selectedErrorID + '.' + selectedErrorService);
 
+             if (selection.empty()) {
+               // Return to browse mode if selected DOM elements have
+               // disappeared because the user moved them out of view..
+               var source = d3_event && d3_event.type === 'zoom' && d3_event.sourceEvent;
 
-           source.name = function() {
-               return _t('background.none');
-           };
+               if (drawn && source && (source.type === 'pointermove' || source.type === 'mousemove' || source.type === 'touchmove')) {
+                 context.enter(modeBrowse(context));
+               }
+             } else {
+               selection.classed('selected', true);
+               context.selectedErrorID(selectedErrorID);
+             }
+           }
 
+           function esc() {
+             if (context.container().select('.combobox').size()) return;
+             context.enter(modeBrowse(context));
+           }
+         };
 
-           source.imageryUsed = function() {
-               return null;
-           };
+         mode.exit = function () {
+           behaviors.forEach(context.uninstall);
+           select(document).call(keybinding.unbind);
+           context.surface().selectAll('.qaItem.selected').classed('selected hover', false);
+           context.map().on('drawn.select-error', null);
+           context.ui().sidebar.hide();
+           context.selectedErrorID(null);
+           context.features().forceVisible([]);
+         };
 
+         return mode;
+       }
 
-           source.area = function() {
-               return -1;  // sources in background pane are sorted by area
-           };
+       function behaviorSelect(context) {
+         var _tolerancePx = 4; // see also behaviorDrag
 
+         var _lastMouseEvent = null;
+         var _showMenu = false;
+         var _downPointers = {};
+         var _longPressTimeout = null;
+         var _lastInteractionType = null; // the id of the down pointer that's enabling multiselection while down
 
-           return source;
-       };
+         var _multiselectionPointerId = null; // use pointer events on supported platforms; fallback to mouse events
 
+         var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
 
-       rendererBackgroundSource.Custom = function(template) {
-           var source = rendererBackgroundSource({ id: 'custom', template: template });
+         function keydown(d3_event) {
+           if (d3_event.keyCode === 32) {
+             // don't react to spacebar events during text input
+             var activeNode = document.activeElement;
+             if (activeNode && new Set(['INPUT', 'TEXTAREA']).has(activeNode.nodeName)) return;
+           }
 
+           if (d3_event.keyCode === 93 || // context menu key
+           d3_event.keyCode === 32) {
+             // spacebar
+             d3_event.preventDefault();
+           }
 
-           source.name = function() {
-               return _t('background.custom');
-           };
+           if (d3_event.repeat) return; // ignore repeated events for held keys
+           // if any key is pressed the user is probably doing something other than long-pressing
 
+           cancelLongPress();
 
-           source.imageryUsed = function() {
-               // sanitize personal connection tokens - #6801
-               var cleaned = source.template();
+           if (d3_event.shiftKey) {
+             context.surface().classed('behavior-multiselect', true);
+           }
 
-               // from query string parameters
-               if (cleaned.indexOf('?') !== -1) {
-                   var parts = cleaned.split('?', 2);
-                   var qs = utilStringQs(parts[1]);
+           if (d3_event.keyCode === 32) {
+             // spacebar
+             if (!_downPointers.spacebar && _lastMouseEvent) {
+               cancelLongPress();
+               _longPressTimeout = window.setTimeout(didLongPress, 500, 'spacebar', 'spacebar');
+               _downPointers.spacebar = {
+                 firstEvent: _lastMouseEvent,
+                 lastEvent: _lastMouseEvent
+               };
+             }
+           }
+         }
 
-                   ['access_token', 'connectId', 'token'].forEach(function(param) {
-                       if (qs[param]) {
-                           qs[param] = '{apikey}';
-                       }
-                   });
-                   cleaned = parts[0] + '?' + utilQsString(qs, true);  // true = soft encode
-               }
+         function keyup(d3_event) {
+           cancelLongPress();
 
-               // from wms/wmts api path parameters
-               cleaned = cleaned.replace(/token\/(\w+)/, 'token/{apikey}');
+           if (!d3_event.shiftKey) {
+             context.surface().classed('behavior-multiselect', false);
+           }
 
-               return 'Custom (' + cleaned + ' )';
-           };
+           if (d3_event.keyCode === 93) {
+             // context menu key
+             d3_event.preventDefault();
+             _lastInteractionType = 'menukey';
+             contextmenu(d3_event);
+           } else if (d3_event.keyCode === 32) {
+             // spacebar
+             var pointer = _downPointers.spacebar;
 
+             if (pointer) {
+               delete _downPointers.spacebar;
+               if (pointer.done) return;
+               d3_event.preventDefault();
+               _lastInteractionType = 'spacebar';
+               click(pointer.firstEvent, pointer.lastEvent, 'spacebar');
+             }
+           }
+         }
 
-           source.area = function() {
-               return -2;  // sources in background pane are sorted by area
+         function pointerdown(d3_event) {
+           var id = (d3_event.pointerId || 'mouse').toString();
+           cancelLongPress();
+           if (d3_event.buttons && d3_event.buttons !== 1) return;
+           context.ui().closeEditMenu();
+           _longPressTimeout = window.setTimeout(didLongPress, 500, id, 'longdown-' + (d3_event.pointerType || 'mouse'));
+           _downPointers[id] = {
+             firstEvent: d3_event,
+             lastEvent: d3_event
            };
+         }
 
+         function didLongPress(id, interactionType) {
+           var pointer = _downPointers[id];
+           if (!pointer) return;
 
-           return source;
-       };
+           for (var i in _downPointers) {
+             // don't allow this or any currently down pointer to trigger another click
+             _downPointers[i].done = true;
+           } // treat long presses like right-clicks
 
-       function rendererTileLayer(context) {
-           var transformProp = utilPrefixCSSProperty('Transform');
-           var tiler = utilTiler();
 
-           var _tileSize = 256;
-           var _projection;
-           var _cache = {};
-           var _tileOrigin;
-           var _zoom;
-           var _source;
+           _longPressTimeout = null;
+           _lastInteractionType = interactionType;
+           _showMenu = true;
+           click(pointer.firstEvent, pointer.lastEvent, id);
+         }
 
+         function pointermove(d3_event) {
+           var id = (d3_event.pointerId || 'mouse').toString();
 
-           function tileSizeAtZoom(d, z) {
-               var EPSILON = 0.002;    // close seams
-               return ((_tileSize * Math.pow(2, z - d[2])) / _tileSize) + EPSILON;
+           if (_downPointers[id]) {
+             _downPointers[id].lastEvent = d3_event;
            }
 
+           if (!d3_event.pointerType || d3_event.pointerType === 'mouse') {
+             _lastMouseEvent = d3_event;
 
-           function atZoom(t, distance) {
-               var power = Math.pow(2, distance);
-               return [
-                   Math.floor(t[0] * power),
-                   Math.floor(t[1] * power),
-                   t[2] + distance
-               ];
+             if (_downPointers.spacebar) {
+               _downPointers.spacebar.lastEvent = d3_event;
+             }
            }
+         }
 
+         function pointerup(d3_event) {
+           var id = (d3_event.pointerId || 'mouse').toString();
+           var pointer = _downPointers[id];
+           if (!pointer) return;
+           delete _downPointers[id];
 
-           function lookUp(d) {
-               for (var up = -1; up > -d[2]; up--) {
-                   var tile = atZoom(d, up);
-                   if (_cache[_source.url(tile)] !== false) {
-                       return tile;
-                   }
-               }
+           if (_multiselectionPointerId === id) {
+             _multiselectionPointerId = null;
            }
 
+           if (pointer.done) return;
+           click(pointer.firstEvent, d3_event, id);
+         }
 
-           function uniqueBy(a, n) {
-               var o = [];
-               var seen = {};
-               for (var i = 0; i < a.length; i++) {
-                   if (seen[a[i][n]] === undefined) {
-                       o.push(a[i]);
-                       seen[a[i][n]] = true;
-                   }
-               }
-               return o;
-           }
-
+         function pointercancel(d3_event) {
+           var id = (d3_event.pointerId || 'mouse').toString();
+           if (!_downPointers[id]) return;
+           delete _downPointers[id];
 
-           function addSource(d) {
-               d.push(_source.url(d));
-               return d;
+           if (_multiselectionPointerId === id) {
+             _multiselectionPointerId = null;
            }
+         }
 
+         function contextmenu(d3_event) {
+           d3_event.preventDefault();
 
-           // Update tiles based on current state of `projection`.
-           function background(selection) {
-               _zoom = geoScaleToZoom(_projection.scale(), _tileSize);
-
-               var pixelOffset;
-               if (_source) {
-                   pixelOffset = [
-                       _source.offset()[0] * Math.pow(2, _zoom),
-                       _source.offset()[1] * Math.pow(2, _zoom)
-                   ];
-               } else {
-                   pixelOffset = [0, 0];
-               }
+           if (!+d3_event.clientX && !+d3_event.clientY) {
+             if (_lastMouseEvent) {
+               d3_event.sourceEvent = _lastMouseEvent;
+             } else {
+               return;
+             }
+           } else {
+             _lastMouseEvent = d3_event;
+             _lastInteractionType = 'rightclick';
+           }
 
-               var translate = [
-                   _projection.translate()[0] + pixelOffset[0],
-                   _projection.translate()[1] + pixelOffset[1]
-               ];
+           _showMenu = true;
+           click(d3_event, d3_event);
+         }
 
-               tiler
-                   .scale(_projection.scale() * 2 * Math.PI)
-                   .translate(translate);
+         function click(firstEvent, lastEvent, pointerId) {
+           cancelLongPress();
+           var mapNode = context.container().select('.main-map').node(); // Use the `main-map` coordinate system since the surface and supersurface
+           // are transformed when drag-panning.
 
-               _tileOrigin = [
-                   _projection.scale() * Math.PI - translate[0],
-                   _projection.scale() * Math.PI - translate[1]
-               ];
+           var pointGetter = utilFastMouse(mapNode);
+           var p1 = pointGetter(firstEvent);
+           var p2 = pointGetter(lastEvent);
+           var dist = geoVecLength(p1, p2);
 
-               render(selection);
+           if (dist > _tolerancePx || !mapContains(lastEvent)) {
+             resetProperties();
+             return;
            }
 
+           var targetDatum = lastEvent.target.__data__;
+           var multiselectEntityId;
 
-           // Derive the tiles onscreen, remove those offscreen and position them.
-           // Important that this part not depend on `_projection` because it's
-           // rentered when tiles load/error (see #644).
-           function render(selection) {
-               if (!_source) return;
-               var requests = [];
-               var showDebug = context.getDebug('tile') && !_source.overlay;
+           if (!_multiselectionPointerId) {
+             // If a different pointer than the one triggering this click is down on a
+             // feature, treat this and all future clicks as multiselection until that
+             // pointer is raised.
+             var selectPointerInfo = pointerDownOnSelection(pointerId);
 
-               if (_source.validZoom(_zoom)) {
-                   tiler.skipNullIsland(!!_source.overlay);
+             if (selectPointerInfo) {
+               _multiselectionPointerId = selectPointerInfo.pointerId; // if the other feature isn't selected yet, make sure we select it
 
-                   tiler().forEach(function(d) {
-                       addSource(d);
-                       if (d[3] === '') return;
-                       if (typeof d[3] !== 'string') return; // Workaround for #2295
-                       requests.push(d);
-                       if (_cache[d[3]] === false && lookUp(d)) {
-                           requests.push(addSource(lookUp(d)));
-                       }
-                   });
+               multiselectEntityId = !selectPointerInfo.selected && selectPointerInfo.entityId;
+               _downPointers[selectPointerInfo.pointerId].done = true;
+             }
+           } // support multiselect if data is already selected
 
-                   requests = uniqueBy(requests, 3).filter(function(r) {
-                       // don't re-request tiles which have failed in the past
-                       return _cache[r[3]] !== false;
-                   });
-               }
 
-               function load(d) {
-                   _cache[d[3]] = true;
-                   select(this)
-                       .on('error', null)
-                       .on('load', null)
-                       .classed('tile-loaded', true);
-                   render(selection);
-               }
+           var isMultiselect = context.mode().id === 'select' && ( // and shift key is down
+           lastEvent && lastEvent.shiftKey || // or we're lasso-selecting
+           context.surface().select('.lasso').node() || // or a pointer is down over a selected feature
+           _multiselectionPointerId && !multiselectEntityId);
 
-               function error(d) {
-                   _cache[d[3]] = false;
-                   select(this)
-                       .on('error', null)
-                       .on('load', null)
-                       .remove();
-                   render(selection);
-               }
+           processClick(targetDatum, isMultiselect, p2, multiselectEntityId);
 
-               function imageTransform(d) {
-                   var ts = _tileSize * Math.pow(2, _zoom - d[2]);
-                   var scale = tileSizeAtZoom(d, _zoom);
-                   return 'translate(' +
-                       ((d[0] * ts) - _tileOrigin[0]) + 'px,' +
-                       ((d[1] * ts) - _tileOrigin[1]) + 'px) ' +
-                       'scale(' + scale + ',' + scale + ')';
-               }
+           function mapContains(event) {
+             var rect = mapNode.getBoundingClientRect();
+             return event.clientX >= rect.left && event.clientX <= rect.right && event.clientY >= rect.top && event.clientY <= rect.bottom;
+           }
 
-               function tileCenter(d) {
-                   var ts = _tileSize * Math.pow(2, _zoom - d[2]);
-                   return [
-                       ((d[0] * ts) - _tileOrigin[0] + (ts / 2)),
-                       ((d[1] * ts) - _tileOrigin[1] + (ts / 2))
-                   ];
-               }
+           function pointerDownOnSelection(skipPointerId) {
+             var mode = context.mode();
+             var selectedIDs = mode.id === 'select' ? mode.selectedIDs() : [];
 
-               function debugTransform(d) {
-                   var coord = tileCenter(d);
-                   return 'translate(' + coord[0] + 'px,' + coord[1] + 'px)';
-               }
+             for (var pointerId in _downPointers) {
+               if (pointerId === 'spacebar' || pointerId === skipPointerId) continue;
+               var pointerInfo = _downPointers[pointerId];
+               var p1 = pointGetter(pointerInfo.firstEvent);
+               var p2 = pointGetter(pointerInfo.lastEvent);
+               if (geoVecLength(p1, p2) > _tolerancePx) continue;
+               var datum = pointerInfo.firstEvent.target.__data__;
+               var entity = datum && datum.properties && datum.properties.entity || datum;
+               if (context.graph().hasEntity(entity.id)) return {
+                 pointerId: pointerId,
+                 entityId: entity.id,
+                 selected: selectedIDs.indexOf(entity.id) !== -1
+               };
+             }
 
+             return null;
+           }
+         }
 
-               // Pick a representative tile near the center of the viewport
-               // (This is useful for sampling the imagery vintage)
-               var dims = tiler.size();
-               var mapCenter = [dims[0] / 2, dims[1] / 2];
-               var minDist = Math.max(dims[0], dims[1]);
-               var nearCenter;
+         function processClick(datum, isMultiselect, point, alsoSelectId) {
+           var mode = context.mode();
+           var showMenu = _showMenu;
+           var interactionType = _lastInteractionType;
+           var entity = datum && datum.properties && datum.properties.entity;
+           if (entity) datum = entity;
 
-               requests.forEach(function(d) {
-                   var c = tileCenter(d);
-                   var dist = geoVecLength(c, mapCenter);
-                   if (dist < minDist) {
-                       minDist = dist;
-                       nearCenter = d;
-                   }
-               });
+           if (datum && datum.type === 'midpoint') {
+             // treat targeting midpoints as if targeting the parent way
+             datum = datum.parents[0];
+           }
 
+           var newMode;
 
-               var image = selection.selectAll('img')
-                   .data(requests, function(d) { return d[3]; });
+           if (datum instanceof osmEntity) {
+             // targeting an entity
+             var selectedIDs = context.selectedIDs();
+             context.selectedNoteID(null);
+             context.selectedErrorID(null);
 
-               image.exit()
-                   .style(transformProp, imageTransform)
-                   .classed('tile-removing', true)
-                   .classed('tile-center', false)
-                   .each(function() {
-                       var tile = select(this);
-                       window.setTimeout(function() {
-                           if (tile.classed('tile-removing')) {
-                               tile.remove();
-                           }
-                       }, 300);
-                   });
+             if (!isMultiselect) {
+               // don't change the selection if we're toggling the menu atop a multiselection
+               if (!showMenu || selectedIDs.length <= 1 || selectedIDs.indexOf(datum.id) === -1) {
+                 if (alsoSelectId === datum.id) alsoSelectId = null;
+                 selectedIDs = (alsoSelectId ? [alsoSelectId] : []).concat([datum.id]); // always enter modeSelect even if the entity is already
+                 // selected since listeners may expect `context.enter` events,
+                 // e.g. in the walkthrough
 
-               image.enter()
-                 .append('img')
-                   .attr('class', 'tile')
-                   .attr('draggable', 'false')
-                   .style('width', _tileSize + 'px')
-                   .style('height', _tileSize + 'px')
-                   .attr('src', function(d) { return d[3]; })
-                   .on('error', error)
-                   .on('load', load)
-                 .merge(image)
-                   .style(transformProp, imageTransform)
-                   .classed('tile-debug', showDebug)
-                   .classed('tile-removing', false)
-                   .classed('tile-center', function(d) { return d === nearCenter; });
-
-
-
-               var debug = selection.selectAll('.tile-label-debug')
-                   .data(showDebug ? requests : [], function(d) { return d[3]; });
-
-               debug.exit()
-                   .remove();
-
-               if (showDebug) {
-                   var debugEnter = debug.enter()
-                       .append('div')
-                       .attr('class', 'tile-label-debug');
-
-                   debugEnter
-                       .append('div')
-                       .attr('class', 'tile-label-debug-coord');
-
-                   debugEnter
-                       .append('div')
-                       .attr('class', 'tile-label-debug-vintage');
-
-                   debug = debug.merge(debugEnter);
-
-                   debug
-                       .style(transformProp, debugTransform);
-
-                   debug
-                       .selectAll('.tile-label-debug-coord')
-                       .text(function(d) { return d[2] + ' / ' + d[0] + ' / ' + d[1]; });
-
-                   debug
-                       .selectAll('.tile-label-debug-vintage')
-                       .each(function(d) {
-                           var span = select(this);
-                           var center = context.projection.invert(tileCenter(d));
-                           _source.getMetadata(center, d, function(err, result) {
-                               span.text((result && result.vintage && result.vintage.range) ||
-                                   _t('info_panels.background.vintage') + ': ' + _t('info_panels.background.unknown')
-                               );
-                           });
-                       });
+                 newMode = mode.id === 'select' ? mode.selectedIDs(selectedIDs) : modeSelect(context, selectedIDs).selectBehavior(behavior);
+                 context.enter(newMode);
                }
+             } else {
+               if (selectedIDs.indexOf(datum.id) !== -1) {
+                 // clicked entity is already in the selectedIDs list..
+                 if (!showMenu) {
+                   // deselect clicked entity, then reenter select mode or return to browse mode..
+                   selectedIDs = selectedIDs.filter(function (id) {
+                     return id !== datum.id;
+                   });
+                   newMode = selectedIDs.length ? mode.selectedIDs(selectedIDs) : modeBrowse(context).selectBehavior(behavior);
+                   context.enter(newMode);
+                 }
+               } else {
+                 // clicked entity is not in the selected list, add it..
+                 selectedIDs = selectedIDs.concat([datum.id]);
+                 newMode = mode.selectedIDs(selectedIDs);
+                 context.enter(newMode);
+               }
+             }
+           } else if (datum && datum.__featurehash__ && !isMultiselect) {
+             // targeting custom data
+             context.selectedNoteID(null).enter(modeSelectData(context, datum));
+           } else if (datum instanceof osmNote && !isMultiselect) {
+             // targeting a note
+             context.selectedNoteID(datum.id).enter(modeSelectNote(context, datum.id));
+           } else if (datum instanceof QAItem & !isMultiselect) {
+             // targeting an external QA issue
+             context.selectedErrorID(datum.id).enter(modeSelectError(context, datum.id, datum.service));
+           } else {
+             // targeting nothing
+             context.selectedNoteID(null);
+             context.selectedErrorID(null);
 
+             if (!isMultiselect && mode.id !== 'browse') {
+               context.enter(modeBrowse(context));
+             }
            }
 
+           context.ui().closeEditMenu(); // always request to show the edit menu in case the mode needs it
 
-           background.projection = function(val) {
-               if (!arguments.length) return _projection;
-               _projection = val;
-               return background;
-           };
+           if (showMenu) context.ui().showEditMenu(point, interactionType);
+           resetProperties();
+         }
 
+         function cancelLongPress() {
+           if (_longPressTimeout) window.clearTimeout(_longPressTimeout);
+           _longPressTimeout = null;
+         }
 
-           background.dimensions = function(val) {
-               if (!arguments.length) return tiler.size();
-               tiler.size(val);
-               return background;
-           };
+         function resetProperties() {
+           cancelLongPress();
+           _showMenu = false;
+           _lastInteractionType = null; // don't reset _lastMouseEvent since it might still be useful
+         }
 
+         function behavior(selection) {
+           resetProperties();
+           _lastMouseEvent = context.map().lastPointerEvent();
+           select(window).on('keydown.select', keydown).on('keyup.select', keyup).on(_pointerPrefix + 'move.select', pointermove, true).on(_pointerPrefix + 'up.select', pointerup, true).on('pointercancel.select', pointercancel, true).on('contextmenu.select-window', function (d3_event) {
+             // Edge and IE really like to show the contextmenu on the
+             // menubar when user presses a keyboard menu button
+             // even after we've already preventdefaulted the key event.
+             var e = d3_event;
 
-           background.source = function(val) {
-               if (!arguments.length) return _source;
-               _source = val;
-               _tileSize = _source.tileSize;
-               _cache = {};
-               tiler.tileSize(_source.tileSize).zoomExtent(_source.zoomExtent);
-               return background;
-           };
+             if (+e.clientX === 0 && +e.clientY === 0) {
+               d3_event.preventDefault();
+             }
+           });
+           selection.on(_pointerPrefix + 'down.select', pointerdown).on('contextmenu.select', contextmenu);
+           /*if (d3_event && d3_event.shiftKey) {
+               context.surface()
+                   .classed('behavior-multiselect', true);
+           }*/
+         }
 
+         behavior.off = function (selection) {
+           cancelLongPress();
+           select(window).on('keydown.select', null).on('keyup.select', null).on('contextmenu.select-window', null).on(_pointerPrefix + 'move.select', null, true).on(_pointerPrefix + 'up.select', null, true).on('pointercancel.select', null, true);
+           selection.on(_pointerPrefix + 'down.select', null).on('contextmenu.select', null);
+           context.surface().classed('behavior-multiselect', false);
+         };
 
-           return background;
+         return behavior;
        }
 
-       let _imageryIndex = null;
-
-       function rendererBackground(context) {
-         const dispatch$1 = dispatch('change');
-         const detected = utilDetect();
-         const baseLayer = rendererTileLayer(context).projection(context.projection);
-         let _isValid = true;
-         let _overlayLayers = [];
-         let _brightness = 1;
-         let _contrast = 1;
-         let _saturation = 1;
-         let _sharpness = 1;
-
-
-         function ensureImageryIndex() {
-           return _mainFileFetcher.get('imagery')
-             .then(sources => {
-               if (_imageryIndex) return _imageryIndex;
-
-               _imageryIndex = {
-                 imagery: sources,
-                 features: {}
-               };
+       function behaviorDrawWay(context, wayID, mode, startGraph) {
+         var dispatch$1 = dispatch('rejectedSelfIntersection');
+         var behavior = behaviorDraw(context); // Must be set by `drawWay.nodeIndex` before each install of this behavior.
 
-               // use which-polygon to support efficient index and querying for imagery
-               const features = sources.map(source => {
-                 if (!source.polygon) return null;
-                 // workaround for editor-layer-index weirdness..
-                 // Add an extra array nest to each element in `source.polygon`
-                 // so the rings are not treated as a bunch of holes:
-                 // what we have: [ [[outer],[hole],[hole]] ]
-                 // what we want: [ [[outer]],[[outer]],[[outer]] ]
-                 const rings = source.polygon.map(ring => [ring]);
-
-                 const feature = {
-                   type: 'Feature',
-                   properties: { id: source.id },
-                   geometry: { type: 'MultiPolygon', coordinates: rings }
-                 };
+         var _nodeIndex;
 
-                 _imageryIndex.features[source.id] = feature;
-                 return feature;
+         var _origWay;
 
-               }).filter(Boolean);
+         var _wayGeometry;
 
-               _imageryIndex.query = whichPolygon_1({ type: 'FeatureCollection', features: features });
+         var _headNodeID;
 
+         var _annotation;
 
-               // Instantiate `rendererBackgroundSource` objects for each source
-               _imageryIndex.backgrounds = sources.map(source => {
-                 if (source.type === 'bing') {
-                   return rendererBackgroundSource.Bing(source, dispatch$1);
-                 } else if (/^EsriWorldImagery/.test(source.id)) {
-                   return rendererBackgroundSource.Esri(source);
-                 } else {
-                   return rendererBackgroundSource(source);
-                 }
-               });
+         var _pointerHasMoved = false; // The osmNode to be placed.
+         // This is temporary and just follows the mouse cursor until an "add" event occurs.
 
-               // Add 'None'
-               _imageryIndex.backgrounds.unshift(rendererBackgroundSource.None());
+         var _drawNode;
 
-               // Add 'Custom'
-               let template = corePreferences('background-custom-template') || '';
-               const custom = rendererBackgroundSource.Custom(template);
-               _imageryIndex.backgrounds.unshift(custom);
+         var _didResolveTempEdit = false;
 
-               return _imageryIndex;
-             });
+         function createDrawNode(loc) {
+           // don't make the draw node until we actually need it
+           _drawNode = osmNode({
+             loc: loc
+           });
+           context.pauseChangeDispatch();
+           context.replace(function actionAddDrawNode(graph) {
+             // add the draw node to the graph and insert it into the way
+             var way = graph.entity(wayID);
+             return graph.replace(_drawNode).replace(way.addNode(_drawNode.id, _nodeIndex));
+           }, _annotation);
+           context.resumeChangeDispatch();
+           setActiveElements();
          }
 
+         function removeDrawNode() {
+           context.pauseChangeDispatch();
+           context.replace(function actionDeleteDrawNode(graph) {
+             var way = graph.entity(wayID);
+             return graph.replace(way.removeNode(_drawNode.id)).remove(_drawNode);
+           }, _annotation);
+           _drawNode = undefined;
+           context.resumeChangeDispatch();
+         }
 
-         function background(selection) {
-           const currSource = baseLayer.source();
-
-           // If we are displaying an Esri basemap at high zoom,
-           // check its tilemap to see how high the zoom can go
-           if (context.map().zoom() > 18) {
-             if (currSource && /^EsriWorldImagery/.test(currSource.id)) {
-               const center = context.map().center();
-               currSource.fetchTilemap(center);
+         function keydown(d3_event) {
+           if (d3_event.keyCode === utilKeybinding.modifierCodes.alt) {
+             if (context.surface().classed('nope')) {
+               context.surface().classed('nope-suppressed', true);
              }
+
+             context.surface().classed('nope', false).classed('nope-disabled', true);
            }
+         }
 
-           // Is the imagery valid here? - #4827
-           const sources = background.sources(context.map().extent());
-           const wasValid = _isValid;
-           _isValid = !!sources.filter(d => d === currSource).length;
+         function keyup(d3_event) {
+           if (d3_event.keyCode === utilKeybinding.modifierCodes.alt) {
+             if (context.surface().classed('nope-suppressed')) {
+               context.surface().classed('nope', true);
+             }
 
-           if (wasValid !== _isValid) {      // change in valid status
-             background.updateImagery();
+             context.surface().classed('nope-suppressed', false).classed('nope-disabled', false);
            }
+         }
 
+         function allowsVertex(d) {
+           return d.geometry(context.graph()) === 'vertex' || _mainPresetIndex.allowsVertex(d, context.graph());
+         } // related code
+         // - `mode/drag_node.js`     `doMove()`
+         // - `behavior/draw.js`      `click()`
+         // - `behavior/draw_way.js`  `move()`
 
-           let baseFilter = '';
-           if (detected.cssfilters) {
-             if (_brightness !== 1) {
-               baseFilter += ` brightness(${_brightness})`;
-             }
-             if (_contrast !== 1) {
-               baseFilter += ` contrast(${_contrast})`;
-             }
-             if (_saturation !== 1) {
-               baseFilter += ` saturate(${_saturation})`;
-             }
-             if (_sharpness < 1) {  // gaussian blur
-               const blur = d3_interpolateNumber(0.5, 5)(1 - _sharpness);
-               baseFilter += ` blur(${blur}px)`;
-             }
-           }
 
-           let base = selection.selectAll('.layer-background')
-             .data([0]);
+         function move(d3_event, datum) {
+           var loc = context.map().mouseCoordinates();
+           if (!_drawNode) createDrawNode(loc);
+           context.surface().classed('nope-disabled', d3_event.altKey);
+           var targetLoc = datum && datum.properties && datum.properties.entity && allowsVertex(datum.properties.entity) && datum.properties.entity.loc;
+           var targetNodes = datum && datum.properties && datum.properties.nodes;
 
-           base = base.enter()
-             .insert('div', '.layer-data')
-             .attr('class', 'layer layer-background')
-             .merge(base);
+           if (targetLoc) {
+             // snap to node/vertex - a point target with `.loc`
+             loc = targetLoc;
+           } else if (targetNodes) {
+             // snap to way - a line target with `.nodes`
+             var choice = geoChooseEdge(targetNodes, context.map().mouse(), context.projection, _drawNode.id);
 
-           if (detected.cssfilters) {
-             base.style('filter', baseFilter || null);
-           } else {
-             base.style('opacity', _brightness);
+             if (choice) {
+               loc = choice.loc;
+             }
            }
 
+           context.replace(actionMoveNode(_drawNode.id, loc), _annotation);
+           _drawNode = context.entity(_drawNode.id);
+           checkGeometry(true
+           /* includeDrawNode */
+           );
+         } // Check whether this edit causes the geometry to break.
+         // If so, class the surface with a nope cursor.
+         // `includeDrawNode` - Only check the relevant line segments if finishing drawing
 
-           let imagery = base.selectAll('.layer-imagery')
-             .data([0]);
 
-           imagery.enter()
-             .append('div')
-             .attr('class', 'layer layer-imagery')
-             .merge(imagery)
-             .call(baseLayer);
+         function checkGeometry(includeDrawNode) {
+           var nopeDisabled = context.surface().classed('nope-disabled');
+           var isInvalid = isInvalidGeometry(includeDrawNode);
 
+           if (nopeDisabled) {
+             context.surface().classed('nope', false).classed('nope-suppressed', isInvalid);
+           } else {
+             context.surface().classed('nope', isInvalid).classed('nope-suppressed', false);
+           }
+         }
 
-           let maskFilter = '';
-           let mixBlendMode = '';
-           if (detected.cssfilters && _sharpness > 1) {  // apply unsharp mask
-             mixBlendMode = 'overlay';
-             maskFilter = 'saturate(0) blur(3px) invert(1)';
+         function isInvalidGeometry(includeDrawNode) {
+           var testNode = _drawNode; // we only need to test the single way we're drawing
 
-             let contrast = _sharpness - 1;
-             maskFilter += ` contrast(${contrast})`;
+           var parentWay = context.graph().entity(wayID);
+           var nodes = context.graph().childNodes(parentWay).slice(); // shallow copy
 
-             let brightness = d3_interpolateNumber(1, 0.85)(_sharpness - 1);
-             maskFilter += ` brightness(${brightness})`;
+           if (includeDrawNode) {
+             if (parentWay.isClosed()) {
+               // don't test the last segment for closed ways - #4655
+               // (still test the first segment)
+               nodes.pop();
+             }
+           } else {
+             // discount the draw node
+             if (parentWay.isClosed()) {
+               if (nodes.length < 3) return false;
+               if (_drawNode) nodes.splice(-2, 1);
+               testNode = nodes[nodes.length - 2];
+             } else {
+               // there's nothing we need to test if we ignore the draw node on open ways
+               return false;
+             }
            }
 
-           let mask = base.selectAll('.layer-unsharp-mask')
-             .data(detected.cssfilters && _sharpness > 1 ? [0] : []);
-
-           mask.exit()
-             .remove();
+           return testNode && geoHasSelfIntersections(nodes, testNode.id);
+         }
 
-           mask.enter()
-             .append('div')
-             .attr('class', 'layer layer-mask layer-unsharp-mask')
-             .merge(mask)
-             .call(baseLayer)
-             .style('filter', maskFilter || null)
-             .style('mix-blend-mode', mixBlendMode || null);
+         function undone() {
+           // undoing removed the temp edit
+           _didResolveTempEdit = true;
+           context.pauseChangeDispatch();
+           var nextMode;
 
+           if (context.graph() === startGraph) {
+             // We've undone back to the initial state before we started drawing.
+             // Just exit the draw mode without undoing whatever we did before
+             // we entered the draw mode.
+             nextMode = modeSelect(context, [wayID]);
+           } else {
+             // The `undo` only removed the temporary edit, so here we have to
+             // manually undo to actually remove the last node we added. We can't
+             // use the `undo` function since the initial "add" graph doesn't have
+             // an annotation and so cannot be undone to.
+             context.pop(1); // continue drawing
+
+             nextMode = mode;
+           } // clear the redo stack by adding and removing a blank edit
+
+
+           context.perform(actionNoop());
+           context.pop(1);
+           context.resumeChangeDispatch();
+           context.enter(nextMode);
+         }
+
+         function setActiveElements() {
+           if (!_drawNode) return;
+           context.surface().selectAll('.' + _drawNode.id).classed('active', true);
+         }
+
+         function resetToStartGraph() {
+           while (context.graph() !== startGraph) {
+             context.pop();
+           }
+         }
+
+         var drawWay = function drawWay(surface) {
+           _drawNode = undefined;
+           _didResolveTempEdit = false;
+           _origWay = context.entity(wayID);
+           _headNodeID = typeof _nodeIndex === 'number' ? _origWay.nodes[_nodeIndex] : _origWay.isClosed() ? _origWay.nodes[_origWay.nodes.length - 2] : _origWay.nodes[_origWay.nodes.length - 1];
+           _wayGeometry = _origWay.geometry(context.graph());
+           _annotation = _t((_origWay.nodes.length === (_origWay.isClosed() ? 2 : 1) ? 'operations.start.annotation.' : 'operations.continue.annotation.') + _wayGeometry);
+           _pointerHasMoved = false; // Push an annotated state for undo to return back to.
+           // We must make sure to replace or remove it later.
+
+           context.pauseChangeDispatch();
+           context.perform(actionNoop(), _annotation);
+           context.resumeChangeDispatch();
+           behavior.hover().initialNodeID(_headNodeID);
+           behavior.on('move', function () {
+             _pointerHasMoved = true;
+             move.apply(this, arguments);
+           }).on('down', function () {
+             move.apply(this, arguments);
+           }).on('downcancel', function () {
+             if (_drawNode) removeDrawNode();
+           }).on('click', drawWay.add).on('clickWay', drawWay.addWay).on('clickNode', drawWay.addNode).on('undo', context.undo).on('cancel', drawWay.cancel).on('finish', drawWay.finish);
+           select(window).on('keydown.drawWay', keydown).on('keyup.drawWay', keyup);
+           context.map().dblclickZoomEnable(false).on('drawn.draw', setActiveElements);
+           setActiveElements();
+           surface.call(behavior);
+           context.history().on('undone.draw', undone);
+         };
+
+         drawWay.off = function (surface) {
+           if (!_didResolveTempEdit) {
+             // Drawing was interrupted unexpectedly.
+             // This can happen if the user changes modes,
+             // clicks geolocate button, a hashchange event occurs, etc.
+             context.pauseChangeDispatch();
+             resetToStartGraph();
+             context.resumeChangeDispatch();
+           }
+
+           _drawNode = undefined;
+           _nodeIndex = undefined;
+           context.map().on('drawn.draw', null);
+           surface.call(behavior.off).selectAll('.active').classed('active', false);
+           surface.classed('nope', false).classed('nope-suppressed', false).classed('nope-disabled', false);
+           select(window).on('keydown.drawWay', null).on('keyup.drawWay', null);
+           context.history().on('undone.draw', null);
+         };
+
+         function attemptAdd(d, loc, doAdd) {
+           if (_drawNode) {
+             // move the node to the final loc in case move wasn't called
+             // consistently (e.g. on touch devices)
+             context.replace(actionMoveNode(_drawNode.id, loc), _annotation);
+             _drawNode = context.entity(_drawNode.id);
+           } else {
+             createDrawNode(loc);
+           }
 
-           let overlays = selection.selectAll('.layer-overlay')
-             .data(_overlayLayers, d => d.source().name());
+           checkGeometry(true
+           /* includeDrawNode */
+           );
 
-           overlays.exit()
-             .remove();
+           if (d && d.properties && d.properties.nope || context.surface().classed('nope')) {
+             if (!_pointerHasMoved) {
+               // prevent the temporary draw node from appearing on touch devices
+               removeDrawNode();
+             }
 
-           overlays.enter()
-             .insert('div', '.layer-data')
-             .attr('class', 'layer layer-overlay')
-             .merge(overlays)
-             .each((layer, i, nodes) => select(nodes[i]).call(layer));
-         }
+             dispatch$1.call('rejectedSelfIntersection', this);
+             return; // can't click here
+           }
 
+           context.pauseChangeDispatch();
+           doAdd(); // we just replaced the temporary edit with the real one
 
-         background.updateImagery = function() {
-           let currSource = baseLayer.source();
-           if (context.inIntro() || !currSource) return;
+           _didResolveTempEdit = true;
+           context.resumeChangeDispatch();
+           context.enter(mode);
+         } // Accept the current position of the drawing node
 
-           let o = _overlayLayers
-             .filter(d => !d.source().isLocatorOverlay() && !d.source().isHidden())
-             .map(d => d.source().id)
-             .join(',');
 
-           const meters = geoOffsetToMeters(currSource.offset());
-           const EPSILON = 0.01;
-           const x = +meters[0].toFixed(2);
-           const y = +meters[1].toFixed(2);
-           let hash = utilStringQs(window.location.hash);
+         drawWay.add = function (loc, d) {
+           attemptAdd(d, loc, function () {// don't need to do anything extra
+           });
+         }; // Connect the way to an existing way
 
-           let id = currSource.id;
-           if (id === 'custom') {
-             id = `custom:${currSource.template()}`;
-           }
 
-           if (id) {
-             hash.background = id;
-           } else {
-             delete hash.background;
-           }
+         drawWay.addWay = function (loc, edge, d) {
+           attemptAdd(d, loc, function () {
+             context.replace(actionAddMidpoint({
+               loc: loc,
+               edge: edge
+             }, _drawNode), _annotation);
+           });
+         }; // Connect the way to an existing node
 
-           if (o) {
-             hash.overlays = o;
-           } else {
-             delete hash.overlays;
-           }
 
-           if (Math.abs(x) > EPSILON || Math.abs(y) > EPSILON) {
-             hash.offset = `${x},${y}`;
-           } else {
-             delete hash.offset;
+         drawWay.addNode = function (node, d) {
+           // finish drawing if the mapper targets the prior node
+           if (node.id === _headNodeID || // or the first node when drawing an area
+           _origWay.isClosed() && node.id === _origWay.first()) {
+             drawWay.finish();
+             return;
            }
 
-           if (!window.mocha) {
-             window.location.replace('#' + utilQsString(hash, true));
-           }
+           attemptAdd(d, node.loc, function () {
+             context.replace(function actionReplaceDrawNode(graph) {
+               // remove the temporary draw node and insert the existing node
+               // at the same index
+               graph = graph.replace(graph.entity(wayID).removeNode(_drawNode.id)).remove(_drawNode);
+               return graph.replace(graph.entity(wayID).addNode(node.id, _nodeIndex));
+             }, _annotation);
+           });
+         }; // Finish the draw operation, removing the temporary edit.
+         // If the way has enough nodes to be valid, it's selected.
+         // Otherwise, delete everything and return to browse mode.
 
-           let imageryUsed = [];
-           let photoOverlaysUsed = [];
 
-           const currUsed = currSource.imageryUsed();
-           if (currUsed && _isValid) {
-             imageryUsed.push(currUsed);
+         drawWay.finish = function () {
+           checkGeometry(false
+           /* includeDrawNode */
+           );
+
+           if (context.surface().classed('nope')) {
+             dispatch$1.call('rejectedSelfIntersection', this);
+             return; // can't click here
            }
 
-           _overlayLayers
-             .filter(d => !d.source().isLocatorOverlay() && !d.source().isHidden())
-             .forEach(d => imageryUsed.push(d.source().imageryUsed()));
+           context.pauseChangeDispatch(); // remove the temporary edit
 
-           const dataLayer = context.layers().layer('data');
-           if (dataLayer && dataLayer.enabled() && dataLayer.hasData()) {
-             imageryUsed.push(dataLayer.getSrc());
+           context.pop(1);
+           _didResolveTempEdit = true;
+           context.resumeChangeDispatch();
+           var way = context.hasEntity(wayID);
+
+           if (!way || way.isDegenerate()) {
+             drawWay.cancel();
+             return;
            }
 
-           const photoOverlayLayers = {
-             streetside: 'Bing Streetside',
-             mapillary: 'Mapillary Images',
-             'mapillary-map-features': 'Mapillary Map Features',
-             'mapillary-signs': 'Mapillary Signs',
-             openstreetcam: 'OpenStreetCam Images'
-           };
+           window.setTimeout(function () {
+             context.map().dblclickZoomEnable(true);
+           }, 1000);
+           var isNewFeature = !mode.isContinuing;
+           context.enter(modeSelect(context, [wayID]).newFeature(isNewFeature));
+         }; // Cancel the draw operation, delete everything, and return to browse mode.
 
-           for (let layerID in photoOverlayLayers) {
-             const layer = context.layers().layer(layerID);
-             if (layer && layer.enabled()) {
-               photoOverlaysUsed.push(layerID);
-               imageryUsed.push(photoOverlayLayers[layerID]);
-             }
-           }
 
-           context.history().imageryUsed(imageryUsed);
-           context.history().photoOverlaysUsed(photoOverlaysUsed);
+         drawWay.cancel = function () {
+           context.pauseChangeDispatch();
+           resetToStartGraph();
+           context.resumeChangeDispatch();
+           window.setTimeout(function () {
+             context.map().dblclickZoomEnable(true);
+           }, 1000);
+           context.surface().classed('nope', false).classed('nope-disabled', false).classed('nope-suppressed', false);
+           context.enter(modeBrowse(context));
          };
 
+         drawWay.nodeIndex = function (val) {
+           if (!arguments.length) return _nodeIndex;
+           _nodeIndex = val;
+           return drawWay;
+         };
 
-         background.sources = (extent, zoom, includeCurrent) => {
-           if (!_imageryIndex) return [];   // called before init()?
+         drawWay.activeID = function () {
+           if (!arguments.length) return _drawNode && _drawNode.id; // no assign
 
-           let visible = {};
-           (_imageryIndex.query.bbox(extent.rectangle(), true) || [])
-             .forEach(d => visible[d.id] = true);
+           return drawWay;
+         };
 
-           const currSource = baseLayer.source();
+         return utilRebind(drawWay, dispatch$1, 'on');
+       }
 
-           return _imageryIndex.backgrounds.filter(source => {
-             if (!source.polygon) return true;                          // always include imagery with worldwide coverage
-             if (includeCurrent && currSource === source) return true;  // optionally include the current imagery
-             if (zoom && zoom < 6) return false;                        // optionally exclude local imagery at low zooms
-             return visible[source.id];                                 // include imagery visible in given extent
-           });
+       function modeDrawLine(context, wayID, startGraph, button, affix, continuing) {
+         var mode = {
+           button: button,
+           id: 'draw-line'
          };
+         var behavior = behaviorDrawWay(context, wayID, mode, startGraph).on('rejectedSelfIntersection.modeDrawLine', function () {
+           context.ui().flash.iconName('#iD-icon-no').label(_t('self_intersection.error.lines'))();
+         });
+         mode.wayID = wayID;
+         mode.isContinuing = continuing;
 
+         mode.enter = function () {
+           behavior.nodeIndex(affix === 'prefix' ? 0 : undefined);
+           context.install(behavior);
+         };
 
-         background.dimensions = (val) => {
-           if (!val) return;
-           baseLayer.dimensions(val);
-           _overlayLayers.forEach(layer => layer.dimensions(val));
+         mode.exit = function () {
+           context.uninstall(behavior);
          };
 
+         mode.selectedIDs = function () {
+           return [wayID];
+         };
 
-         background.baseLayerSource = function(d) {
-           if (!arguments.length) return baseLayer.source();
+         mode.activeID = function () {
+           return behavior && behavior.activeID() || [];
+         };
 
-           // test source against OSM imagery blacklists..
-           const osm = context.connection();
-           if (!osm) return background;
+         return mode;
+       }
 
-           const blacklists = osm.imageryBlacklists();
-           const template = d.template();
-           let fail = false;
-           let tested = 0;
-           let regex;
+       function operationContinue(context, selectedIDs) {
+         var _entities = selectedIDs.map(function (id) {
+           return context.graph().entity(id);
+         });
 
-           for (let i = 0; i < blacklists.length; i++) {
-             try {
-               regex = new RegExp(blacklists[i]);
-               fail = regex.test(template);
-               tested++;
-               if (fail) break;
-             } catch (e) {
-               /* noop */
-             }
-           }
+         var _geometries = Object.assign({
+           line: [],
+           vertex: []
+         }, utilArrayGroupBy(_entities, function (entity) {
+           return entity.geometry(context.graph());
+         }));
 
-           // ensure at least one test was run.
-           if (!tested) {
-             regex = new RegExp('.*\.google(apis)?\..*/(vt|kh)[\?/].*([xyz]=.*){3}.*');
-             fail = regex.test(template);
-           }
+         var _vertex = _geometries.vertex.length && _geometries.vertex[0];
 
-           baseLayer.source(!fail ? d : background.findSource('none'));
-           dispatch$1.call('change');
-           background.updateImagery();
-           return background;
-         };
+         function candidateWays() {
+           return _vertex ? context.graph().parentWays(_vertex).filter(function (parent) {
+             return parent.geometry(context.graph()) === 'line' && !parent.isClosed() && parent.affix(_vertex.id) && (_geometries.line.length === 0 || _geometries.line[0] === parent);
+           }) : [];
+         }
 
+         var _candidates = candidateWays();
 
-         background.findSource = (id) => {
-           if (!id || !_imageryIndex) return null;   // called before init()?
-           return _imageryIndex.backgrounds.find(d => d.id && d.id === id);
+         var operation = function operation() {
+           var candidate = _candidates[0];
+           context.enter(modeDrawLine(context, candidate.id, context.graph(), 'line', candidate.affix(_vertex.id), true));
          };
 
+         operation.relatedEntityIds = function () {
+           return _candidates.length ? [_candidates[0].id] : [];
+         };
 
-         background.bing = () => {
-           background.baseLayerSource(background.findSource('Bing'));
+         operation.available = function () {
+           return _geometries.vertex.length === 1 && _geometries.line.length <= 1 && !context.features().hasHiddenConnections(_vertex, context.graph());
          };
 
+         operation.disabled = function () {
+           if (_candidates.length === 0) {
+             return 'not_eligible';
+           } else if (_candidates.length > 1) {
+             return 'multiple';
+           }
 
-         background.showsLayer = (d) => {
-           const currSource = baseLayer.source();
-           if (!d || !currSource) return false;
-           return d.id === currSource.id || _overlayLayers.some(layer => d.id === layer.source().id);
+           return false;
          };
 
+         operation.tooltip = function () {
+           var disable = operation.disabled();
+           return disable ? _t('operations.continue.' + disable) : _t('operations.continue.description');
+         };
 
-         background.overlayLayerSources = () => {
-           return _overlayLayers.map(layer => layer.source());
+         operation.annotation = function () {
+           return _t('operations.continue.annotation.line');
          };
 
+         operation.id = 'continue';
+         operation.keys = [_t('operations.continue.key')];
+         operation.title = _t('operations.continue.title');
+         operation.behavior = behaviorOperation(context).which(operation);
+         return operation;
+       }
 
-         background.toggleOverlayLayer = (d) => {
-           let layer;
-           for (let i = 0; i < _overlayLayers.length; i++) {
-             layer = _overlayLayers[i];
-             if (layer.source() === d) {
-               _overlayLayers.splice(i, 1);
-               dispatch$1.call('change');
-               background.updateImagery();
-               return;
+       function operationCopy(context, selectedIDs) {
+         function getFilteredIdsToCopy() {
+           return selectedIDs.filter(function (selectedID) {
+             var entity = context.graph().hasEntity(selectedID); // don't copy untagged vertices separately from ways
+
+             return entity.hasInterestingTags() || entity.geometry(context.graph()) !== 'vertex';
+           });
+         }
+
+         var operation = function operation() {
+           var graph = context.graph();
+           var selected = groupEntities(getFilteredIdsToCopy(), graph);
+           var canCopy = [];
+           var skip = {};
+           var entity;
+           var i;
+
+           for (i = 0; i < selected.relation.length; i++) {
+             entity = selected.relation[i];
+
+             if (!skip[entity.id] && entity.isComplete(graph)) {
+               canCopy.push(entity.id);
+               skip = getDescendants(entity.id, graph, skip);
              }
            }
 
-           layer = rendererTileLayer(context)
-             .source(d)
-             .projection(context.projection)
-             .dimensions(baseLayer.dimensions()
-           );
+           for (i = 0; i < selected.way.length; i++) {
+             entity = selected.way[i];
 
-           _overlayLayers.push(layer);
-           dispatch$1.call('change');
-           background.updateImagery();
-         };
+             if (!skip[entity.id]) {
+               canCopy.push(entity.id);
+               skip = getDescendants(entity.id, graph, skip);
+             }
+           }
 
+           for (i = 0; i < selected.node.length; i++) {
+             entity = selected.node[i];
 
-         background.nudge = (d, zoom) => {
-           const currSource = baseLayer.source();
-           if (currSource) {
-             currSource.nudge(d, zoom);
-             dispatch$1.call('change');
-             background.updateImagery();
+             if (!skip[entity.id]) {
+               canCopy.push(entity.id);
+             }
+           }
+
+           context.copyIDs(canCopy);
+
+           if (_point && (canCopy.length !== 1 || graph.entity(canCopy[0]).type !== 'node')) {
+             // store the anchor coordinates if copying more than a single node
+             context.copyLonLat(context.projection.invert(_point));
+           } else {
+             context.copyLonLat(null);
            }
-           return background;
          };
 
+         function groupEntities(ids, graph) {
+           var entities = ids.map(function (id) {
+             return graph.entity(id);
+           });
+           return Object.assign({
+             relation: [],
+             way: [],
+             node: []
+           }, utilArrayGroupBy(entities, 'type'));
+         }
+
+         function getDescendants(id, graph, descendants) {
+           var entity = graph.entity(id);
+           var children;
+           descendants = descendants || {};
 
-         background.offset = function(d) {
-           const currSource = baseLayer.source();
-           if (!arguments.length) {
-             return (currSource && currSource.offset()) || [0, 0];
+           if (entity.type === 'relation') {
+             children = entity.members.map(function (m) {
+               return m.id;
+             });
+           } else if (entity.type === 'way') {
+             children = entity.nodes;
+           } else {
+             children = [];
            }
-           if (currSource) {
-             currSource.offset(d);
-             dispatch$1.call('change');
-             background.updateImagery();
+
+           for (var i = 0; i < children.length; i++) {
+             if (!descendants[children[i]]) {
+               descendants[children[i]] = true;
+               descendants = getDescendants(children[i], graph, descendants);
+             }
            }
-           return background;
-         };
 
+           return descendants;
+         }
 
-         background.brightness = function(d) {
-           if (!arguments.length) return _brightness;
-           _brightness = d;
-           if (context.mode()) dispatch$1.call('change');
-           return background;
+         operation.available = function () {
+           return getFilteredIdsToCopy().length > 0;
          };
 
+         operation.disabled = function () {
+           var extent = utilTotalExtent(getFilteredIdsToCopy(), context.graph());
 
-         background.contrast = function(d) {
-           if (!arguments.length) return _contrast;
-           _contrast = d;
-           if (context.mode()) dispatch$1.call('change');
-           return background;
+           if (extent.percentContainedIn(context.map().extent()) < 0.8) {
+             return 'too_large';
+           }
+
+           return false;
          };
 
+         operation.availableForKeypress = function () {
+           var selection = window.getSelection && window.getSelection(); // if the user has text selected then let them copy that, not the selected feature
 
-         background.saturation = function(d) {
-           if (!arguments.length) return _saturation;
-           _saturation = d;
-           if (context.mode()) dispatch$1.call('change');
-           return background;
+           return !selection || !selection.toString();
          };
 
+         operation.tooltip = function () {
+           var disable = operation.disabled();
+           return disable ? _t('operations.copy.' + disable, {
+             n: selectedIDs.length
+           }) : _t('operations.copy.description', {
+             n: selectedIDs.length
+           });
+         };
 
-         background.sharpness = function(d) {
-           if (!arguments.length) return _sharpness;
-           _sharpness = d;
-           if (context.mode()) dispatch$1.call('change');
-           return background;
+         operation.annotation = function () {
+           return _t('operations.copy.annotation', {
+             n: selectedIDs.length
+           });
          };
 
-         let _loadPromise;
+         var _point;
 
-         background.ensureLoaded = () => {
+         operation.point = function (val) {
+           _point = val;
+           return operation;
+         };
 
-           if (_loadPromise) return _loadPromise;
+         operation.id = 'copy';
+         operation.keys = [uiCmd('⌘C')];
+         operation.title = _t('operations.copy.title');
+         operation.behavior = behaviorOperation(context).which(operation);
+         return operation;
+       }
 
-           function parseMapParams(qmap) {
-             if (!qmap) return false;
-             const params = qmap.split('/').map(Number);
-             if (params.length < 3 || params.some(isNaN)) return false;
-             return geoExtent([params[2], params[1]]);  // lon,lat
+       function operationDisconnect(context, selectedIDs) {
+         var _vertexIDs = [];
+         var _wayIDs = [];
+         var _otherIDs = [];
+         var _actions = [];
+         selectedIDs.forEach(function (id) {
+           var entity = context.entity(id);
+
+           if (entity.type === 'way') {
+             _wayIDs.push(id);
+           } else if (entity.geometry(context.graph()) === 'vertex') {
+             _vertexIDs.push(id);
+           } else {
+             _otherIDs.push(id);
            }
+         });
 
-           const hash = utilStringQs(window.location.hash);
-           const requested = hash.background || hash.layer;
-           let extent = parseMapParams(hash.map);
-
-           return _loadPromise = ensureImageryIndex()
-             .then(imageryIndex => {
-               const first = imageryIndex.backgrounds.length && imageryIndex.backgrounds[0];
+         var _coords,
+             _descriptionID = '',
+             _annotationID = 'features';
 
-               let best;
-               if (!requested && extent) {
-                 best = background.sources(extent).find(s => s.best());
-               }
+         var _disconnectingVertexIds = [];
+         var _disconnectingWayIds = [];
 
-               // Decide which background layer to display
-               if (requested && requested.indexOf('custom:') === 0) {
-                 const template = requested.replace(/^custom:/, '');
-                 const custom = background.findSource('custom');
-                 background.baseLayerSource(custom.template(template));
-                 corePreferences('background-custom-template', template);
-               } else {
-                 background.baseLayerSource(
-                   background.findSource(requested) ||
-                   best ||
-                   background.findSource(corePreferences('background-last-used')) ||
-                   background.findSource('Bing') ||
-                   first ||
-                   background.findSource('none')
-                 );
-               }
+         if (_vertexIDs.length > 0) {
+           // At the selected vertices, disconnect the selected ways, if any, else
+           // disconnect all connected ways
+           _disconnectingVertexIds = _vertexIDs;
 
-               const locator = imageryIndex.backgrounds.find(d => d.overlay && d.default);
-               if (locator) {
-                 background.toggleOverlayLayer(locator);
-               }
+           _vertexIDs.forEach(function (vertexID) {
+             var action = actionDisconnect(vertexID);
 
-               const overlays = (hash.overlays || '').split(',');
-               overlays.forEach(overlay => {
-                 overlay = background.findSource(overlay);
-                 if (overlay) {
-                   background.toggleOverlayLayer(overlay);
-                 }
+             if (_wayIDs.length > 0) {
+               var waysIDsForVertex = _wayIDs.filter(function (wayID) {
+                 var way = context.entity(wayID);
+                 return way.nodes.indexOf(vertexID) !== -1;
                });
 
-               if (hash.gpx) {
-                 const gpx = context.layers().layer('data');
-                 if (gpx) {
-                   gpx.url(hash.gpx, '.gpx');
-                 }
-               }
+               action.limitWays(waysIDsForVertex);
+             }
 
-               if (hash.offset) {
-                 const offset = hash.offset
-                   .replace(/;/g, ',')
-                   .split(',')
-                   .map(n => !isNaN(n) && n);
+             _actions.push(action);
 
-                 if (offset.length === 2) {
-                   background.offset(geoMetersToOffset(offset));
-                 }
-               }
-             })
-             .catch(() => { /* ignore */ });
-         };
+             _disconnectingWayIds = _disconnectingWayIds.concat(context.graph().parentWays(context.graph().entity(vertexID)).map(function (d) {
+               return d.id;
+             }));
+           });
 
+           _disconnectingWayIds = utilArrayUniq(_disconnectingWayIds).filter(function (id) {
+             return _wayIDs.indexOf(id) === -1;
+           });
+           _descriptionID += _actions.length === 1 ? 'single_point.' : 'multiple_points.';
 
-         return utilRebind(background, dispatch$1, 'on');
-       }
+           if (_wayIDs.length === 1) {
+             _descriptionID += 'single_way.' + context.graph().geometry(_wayIDs[0]);
+           } else {
+             _descriptionID += _wayIDs.length === 0 ? 'no_ways' : 'multiple_ways';
+           }
+         } else if (_wayIDs.length > 0) {
+           // Disconnect the selected ways from each other, if they're connected,
+           // else disconnect them from all connected ways
+           var ways = _wayIDs.map(function (id) {
+             return context.entity(id);
+           });
 
-       function rendererFeatures(context) {
-           var dispatch$1 = dispatch('change', 'redraw');
-           var features = utilRebind({}, dispatch$1, 'on');
-           var _deferred = new Set();
-
-           var traffic_roads = {
-               'motorway': true,
-               'motorway_link': true,
-               'trunk': true,
-               'trunk_link': true,
-               'primary': true,
-               'primary_link': true,
-               'secondary': true,
-               'secondary_link': true,
-               'tertiary': true,
-               'tertiary_link': true,
-               'residential': true,
-               'unclassified': true,
-               'living_street': true
-           };
+           var nodes = utilGetAllNodes(_wayIDs, context.graph());
+           _coords = nodes.map(function (n) {
+             return n.loc;
+           }); // actions for connected nodes shared by at least two selected ways
 
-           var service_roads = {
-               'service': true,
-               'road': true,
-               'track': true
-           };
+           var sharedActions = [];
+           var sharedNodes = []; // actions for connected nodes
 
-           var paths = {
-               'path': true,
-               'footway': true,
-               'cycleway': true,
-               'bridleway': true,
-               'steps': true,
-               'pedestrian': true
-           };
+           var unsharedActions = [];
+           var unsharedNodes = [];
+           nodes.forEach(function (node) {
+             var action = actionDisconnect(node.id).limitWays(_wayIDs);
 
-           var past_futures = {
-               'proposed': true,
-               'construction': true,
-               'abandoned': true,
-               'dismantled': true,
-               'disused': true,
-               'razed': true,
-               'demolished': true,
-               'obliterated': true
-           };
+             if (action.disabled(context.graph()) !== 'not_connected') {
+               var count = 0;
+
+               for (var i in ways) {
+                 var way = ways[i];
 
-           var _cullFactor = 1;
-           var _cache = {};
-           var _rules = {};
-           var _stats = {};
-           var _keys = [];
-           var _hidden = [];
-           var _forceVisible = {};
+                 if (way.nodes.indexOf(node.id) !== -1) {
+                   count += 1;
+                 }
 
+                 if (count > 1) break;
+               }
 
-           function update() {
-               if (!window.mocha) {
-                   var hash = utilStringQs(window.location.hash);
-                   var disabled = features.disabled();
-                   if (disabled.length) {
-                       hash.disable_features = disabled.join(',');
-                   } else {
-                       delete hash.disable_features;
-                   }
-                   window.location.replace('#' + utilQsString(hash, true));
-                   corePreferences('disabled-features', disabled.join(','));
+               if (count > 1) {
+                 sharedActions.push(action);
+                 sharedNodes.push(node);
+               } else {
+                 unsharedActions.push(action);
+                 unsharedNodes.push(node);
                }
-               _hidden = features.hidden();
-               dispatch$1.call('change');
-               dispatch$1.call('redraw');
+             }
+           });
+           _descriptionID += 'no_points.';
+           _descriptionID += _wayIDs.length === 1 ? 'single_way.' : 'multiple_ways.';
+
+           if (sharedActions.length) {
+             // if any nodes are shared, only disconnect the selected ways from each other
+             _actions = sharedActions;
+             _disconnectingVertexIds = sharedNodes.map(function (node) {
+               return node.id;
+             });
+             _descriptionID += 'conjoined';
+             _annotationID = 'from_each_other';
+           } else {
+             // if no nodes are shared, disconnect the selected ways from all connected ways
+             _actions = unsharedActions;
+             _disconnectingVertexIds = unsharedNodes.map(function (node) {
+               return node.id;
+             });
+
+             if (_wayIDs.length === 1) {
+               _descriptionID += context.graph().geometry(_wayIDs[0]);
+             } else {
+               _descriptionID += 'separate';
+             }
            }
+         }
 
+         var _extent = utilTotalExtent(_disconnectingVertexIds, context.graph());
 
-           function defineRule(k, filter, max) {
-               var isEnabled = true;
+         var operation = function operation() {
+           context.perform(function (graph) {
+             return _actions.reduce(function (graph, action) {
+               return action(graph);
+             }, graph);
+           }, operation.annotation());
+           context.validator().validate();
+         };
 
-               _keys.push(k);
-               _rules[k] = {
-                   filter: filter,
-                   enabled: isEnabled,   // whether the user wants it enabled..
-                   count: 0,
-                   currentMax: (max || Infinity),
-                   defaultMax: (max || Infinity),
-                   enable: function() { this.enabled = true; this.currentMax = this.defaultMax; },
-                   disable: function() { this.enabled = false; this.currentMax = 0; },
-                   hidden: function() {
-                       return (this.count === 0 && !this.enabled) ||
-                           this.count > this.currentMax * _cullFactor;
-                   },
-                   autoHidden: function() { return this.hidden() && this.currentMax > 0; }
-               };
+         operation.relatedEntityIds = function () {
+           if (_vertexIDs.length) {
+             return _disconnectingWayIds;
            }
 
+           return _disconnectingVertexIds;
+         };
 
-           defineRule('points', function isPoint(tags, geometry) {
-               return geometry === 'point';
-           }, 200);
+         operation.available = function () {
+           if (_actions.length === 0) return false;
+           if (_otherIDs.length !== 0) return false;
+           if (_vertexIDs.length !== 0 && _wayIDs.length !== 0 && !_wayIDs.every(function (wayID) {
+             return _vertexIDs.some(function (vertexID) {
+               var way = context.entity(wayID);
+               return way.nodes.indexOf(vertexID) !== -1;
+             });
+           })) return false;
+           return true;
+         };
 
-           defineRule('traffic_roads', function isTrafficRoad(tags) {
-               return traffic_roads[tags.highway];
-           });
+         operation.disabled = function () {
+           var reason;
 
-           defineRule('service_roads', function isServiceRoad(tags) {
-               return service_roads[tags.highway];
-           });
+           for (var actionIndex in _actions) {
+             reason = _actions[actionIndex].disabled(context.graph());
+             if (reason) return reason;
+           }
 
-           defineRule('paths', function isPath(tags) {
-               return paths[tags.highway];
-           });
+           if (_extent && _extent.percentContainedIn(context.map().extent()) < 0.8) {
+             return 'too_large.' + ((_vertexIDs.length ? _vertexIDs : _wayIDs).length === 1 ? 'single' : 'multiple');
+           } else if (_coords && someMissing()) {
+             return 'not_downloaded';
+           } else if (selectedIDs.some(context.hasHiddenConnections)) {
+             return 'connected_to_hidden';
+           }
 
-           defineRule('buildings', function isBuilding(tags) {
-               return (
-                   (!!tags.building && tags.building !== 'no') ||
-                   tags.parking === 'multi-storey' ||
-                   tags.parking === 'sheds' ||
-                   tags.parking === 'carports' ||
-                   tags.parking === 'garage_boxes'
-               );
-           }, 250);
-
-           defineRule('building_parts', function isBuildingPart(tags) {
-               return tags['building:part'];
-           });
-
-           defineRule('indoor', function isIndoor(tags) {
-               return tags.indoor;
-           });
-
-           defineRule('landuse', function isLanduse(tags, geometry) {
-               return geometry === 'area' &&
-                   !_rules.buildings.filter(tags) &&
-                   !_rules.building_parts.filter(tags) &&
-                   !_rules.indoor.filter(tags) &&
-                   !_rules.water.filter(tags) &&
-                   !_rules.pistes.filter(tags);
-           });
-
-           defineRule('boundaries', function isBoundary(tags) {
-               return (
-                   !!tags.boundary
-               ) && !(
-                   traffic_roads[tags.highway] ||
-                   service_roads[tags.highway] ||
-                   paths[tags.highway] ||
-                   tags.waterway ||
-                   tags.railway ||
-                   tags.landuse ||
-                   tags.natural ||
-                   tags.building ||
-                   tags.power
-               );
-           });
+           return false;
 
-           defineRule('water', function isWater(tags) {
-               return (
-                   !!tags.waterway ||
-                   tags.natural === 'water' ||
-                   tags.natural === 'coastline' ||
-                   tags.natural === 'bay' ||
-                   tags.landuse === 'pond' ||
-                   tags.landuse === 'basin' ||
-                   tags.landuse === 'reservoir' ||
-                   tags.landuse === 'salt_pond'
-               );
-           });
+           function someMissing() {
+             if (context.inIntro()) return false;
+             var osm = context.connection();
 
-           defineRule('rail', function isRail(tags) {
-               return (
-                   !!tags.railway ||
-                   tags.landuse === 'railway'
-               ) && !(
-                   traffic_roads[tags.highway] ||
-                   service_roads[tags.highway] ||
-                   paths[tags.highway]
-               );
-           });
+             if (osm) {
+               var missing = _coords.filter(function (loc) {
+                 return !osm.isDataLoaded(loc);
+               });
 
-           defineRule('pistes', function isPiste(tags) {
-               return tags['piste:type'];
-           });
+               if (missing.length) {
+                 missing.forEach(function (loc) {
+                   context.loadTileAtLoc(loc);
+                 });
+                 return true;
+               }
+             }
 
-           defineRule('aerialways', function isPiste(tags) {
-               return tags.aerialway &&
-                   tags.aerialway !== 'yes' &&
-                   tags.aerialway !== 'station';
-           });
+             return false;
+           }
+         };
 
-           defineRule('power', function isPower(tags) {
-               return !!tags.power;
-           });
+         operation.tooltip = function () {
+           var disable = operation.disabled();
 
-           // contains a past/future tag, but not in active use as a road/path/cycleway/etc..
-           defineRule('past_future', function isPastFuture(tags) {
-               if (
-                   traffic_roads[tags.highway] ||
-                   service_roads[tags.highway] ||
-                   paths[tags.highway]
-               ) { return false; }
+           if (disable) {
+             return _t('operations.disconnect.' + disable);
+           }
 
-               var strings = Object.keys(tags);
+           return _t('operations.disconnect.description.' + _descriptionID);
+         };
 
-               for (var i = 0; i < strings.length; i++) {
-                   var s = strings[i];
-                   if (past_futures[s] || past_futures[tags[s]]) { return true; }
-               }
-               return false;
-           });
+         operation.annotation = function () {
+           return _t('operations.disconnect.annotation.' + _annotationID);
+         };
 
-           // Lines or areas that don't match another feature filter.
-           // IMPORTANT: The 'others' feature must be the last one defined,
-           //   so that code in getMatches can skip this test if `hasMatch = true`
-           defineRule('others', function isOther(tags, geometry) {
-               return (geometry === 'line' || geometry === 'area');
-           });
+         operation.id = 'disconnect';
+         operation.keys = [_t('operations.disconnect.key')];
+         operation.title = _t('operations.disconnect.title');
+         operation.behavior = behaviorOperation(context).which(operation);
+         return operation;
+       }
 
+       function operationDowngrade(context, selectedIDs) {
+         var _affectedFeatureCount = 0;
 
+         var _downgradeType = downgradeTypeForEntityIDs(selectedIDs);
 
-           features.features = function() {
-               return _rules;
-           };
+         var _multi = _affectedFeatureCount === 1 ? 'single' : 'multiple';
 
+         function downgradeTypeForEntityIDs(entityIds) {
+           var downgradeType;
+           _affectedFeatureCount = 0;
 
-           features.keys = function() {
-               return _keys;
-           };
+           for (var i in entityIds) {
+             var entityID = entityIds[i];
+             var type = downgradeTypeForEntityID(entityID);
 
+             if (type) {
+               _affectedFeatureCount += 1;
 
-           features.enabled = function(k) {
-               if (!arguments.length) {
-                   return _keys.filter(function(k) { return _rules[k].enabled; });
+               if (downgradeType && type !== downgradeType) {
+                 if (downgradeType !== 'generic' && type !== 'generic') {
+                   downgradeType = 'building_address';
+                 } else {
+                   downgradeType = 'generic';
+                 }
+               } else {
+                 downgradeType = type;
                }
-               return _rules[k] && _rules[k].enabled;
-           };
-
+             }
+           }
 
-           features.disabled = function(k) {
-               if (!arguments.length) {
-                   return _keys.filter(function(k) { return !_rules[k].enabled; });
-               }
-               return _rules[k] && !_rules[k].enabled;
-           };
+           return downgradeType;
+         }
 
+         function downgradeTypeForEntityID(entityID) {
+           var graph = context.graph();
+           var entity = graph.entity(entityID);
+           var preset = _mainPresetIndex.match(entity, graph);
+           if (!preset || preset.isFallback()) return null;
 
-           features.hidden = function(k) {
-               if (!arguments.length) {
-                   return _keys.filter(function(k) { return _rules[k].hidden(); });
-               }
-               return _rules[k] && _rules[k].hidden();
-           };
+           if (entity.type === 'node' && preset.id !== 'address' && Object.keys(entity.tags).some(function (key) {
+             return key.match(/^addr:.{1,}/);
+           })) {
+             return 'address';
+           }
 
+           var geometry = entity.geometry(graph);
 
-           features.autoHidden = function(k) {
-               if (!arguments.length) {
-                   return _keys.filter(function(k) { return _rules[k].autoHidden(); });
-               }
-               return _rules[k] && _rules[k].autoHidden();
-           };
+           if (geometry === 'area' && entity.tags.building && !preset.tags.building) {
+             return 'building';
+           }
 
+           if (geometry === 'vertex' && Object.keys(entity.tags).length) {
+             return 'generic';
+           }
 
-           features.enable = function(k) {
-               if (_rules[k] && !_rules[k].enabled) {
-                   _rules[k].enable();
-                   update();
-               }
-           };
+           return null;
+         }
 
-           features.enableAll = function() {
-               var didEnable = false;
-               for (var k in _rules) {
-                   if (!_rules[k].enabled) {
-                       didEnable = true;
-                       _rules[k].enable();
-                   }
-               }
-               if (didEnable) update();
-           };
+         var buildingKeysToKeep = ['architect', 'building', 'height', 'layer', 'source', 'type', 'wheelchair'];
+         var addressKeysToKeep = ['source'];
 
+         var operation = function operation() {
+           context.perform(function (graph) {
+             for (var i in selectedIDs) {
+               var entityID = selectedIDs[i];
+               var type = downgradeTypeForEntityID(entityID);
+               if (!type) continue;
+               var tags = Object.assign({}, graph.entity(entityID).tags); // shallow copy
 
-           features.disable = function(k) {
-               if (_rules[k] && _rules[k].enabled) {
-                   _rules[k].disable();
-                   update();
-               }
-           };
+               for (var key in tags) {
+                 if (type === 'address' && addressKeysToKeep.indexOf(key) !== -1) continue;
 
-           features.disableAll = function() {
-               var didDisable = false;
-               for (var k in _rules) {
-                   if (_rules[k].enabled) {
-                       didDisable = true;
-                       _rules[k].disable();
-                   }
-               }
-               if (didDisable) update();
-           };
+                 if (type === 'building') {
+                   if (buildingKeysToKeep.indexOf(key) !== -1 || key.match(/^building:.{1,}/) || key.match(/^roof:.{1,}/)) continue;
+                 }
 
+                 if (type !== 'generic') {
+                   if (key.match(/^addr:.{1,}/) || key.match(/^source:.{1,}/)) continue;
+                 }
 
-           features.toggle = function(k) {
-               if (_rules[k]) {
-                   (function(f) { return f.enabled ? f.disable() : f.enable(); }(_rules[k]));
-                   update();
+                 delete tags[key];
                }
-           };
 
+               graph = actionChangeTags(entityID, tags)(graph);
+             }
 
-           features.resetStats = function() {
-               for (var i = 0; i < _keys.length; i++) {
-                   _rules[_keys[i]].count = 0;
-               }
-               dispatch$1.call('change');
-           };
+             return graph;
+           }, operation.annotation());
+           context.validator().validate(); // refresh the select mode to enable the delete operation
 
+           context.enter(modeSelect(context, selectedIDs));
+         };
 
-           features.gatherStats = function(d, resolver, dimensions) {
-               var needsRedraw = false;
-               var types = utilArrayGroupBy(d, 'type');
-               var entities = [].concat(types.relation || [], types.way || [], types.node || []);
-               var currHidden, geometry, matches, i, j;
+         operation.available = function () {
+           return _downgradeType;
+         };
 
-               for (i = 0; i < _keys.length; i++) {
-                   _rules[_keys[i]].count = 0;
-               }
+         operation.disabled = function () {
+           if (selectedIDs.some(hasWikidataTag)) {
+             return 'has_wikidata_tag';
+           }
 
-               // adjust the threshold for point/building culling based on viewport size..
-               // a _cullFactor of 1 corresponds to a 1000x1000px viewport..
-               _cullFactor = dimensions[0] * dimensions[1] / 1000000;
+           return false;
 
-               for (i = 0; i < entities.length; i++) {
-                   geometry = entities[i].geometry(resolver);
-                   matches = Object.keys(features.getMatches(entities[i], resolver, geometry));
-                   for (j = 0; j < matches.length; j++) {
-                       _rules[matches[j]].count++;
-                   }
-               }
+           function hasWikidataTag(id) {
+             var entity = context.entity(id);
+             return entity.tags.wikidata && entity.tags.wikidata.trim().length > 0;
+           }
+         };
 
-               currHidden = features.hidden();
-               if (currHidden !== _hidden) {
-                   _hidden = currHidden;
-                   needsRedraw = true;
-                   dispatch$1.call('change');
-               }
+         operation.tooltip = function () {
+           var disable = operation.disabled();
+           return disable ? _t('operations.downgrade.' + disable + '.' + _multi) : _t('operations.downgrade.description.' + _downgradeType);
+         };
 
-               return needsRedraw;
-           };
+         operation.annotation = function () {
+           var suffix;
 
+           if (_downgradeType === 'building_address') {
+             suffix = 'generic';
+           } else {
+             suffix = _downgradeType;
+           }
 
-           features.stats = function() {
-               for (var i = 0; i < _keys.length; i++) {
-                   _stats[_keys[i]] = _rules[_keys[i]].count;
-               }
+           return _t('operations.downgrade.annotation.' + suffix, {
+             n: _affectedFeatureCount
+           });
+         };
 
-               return _stats;
-           };
+         operation.id = 'downgrade';
+         operation.keys = [uiCmd('⌫')];
+         operation.title = _t('operations.downgrade.title');
+         operation.behavior = behaviorOperation(context).which(operation);
+         return operation;
+       }
 
+       function operationExtract(context, selectedIDs) {
+         var _amount = selectedIDs.length === 1 ? 'single' : 'multiple';
 
-           features.clear = function(d) {
-               for (var i = 0; i < d.length; i++) {
-                   features.clearEntity(d[i]);
-               }
-           };
+         var _geometries = utilArrayUniq(selectedIDs.map(function (entityID) {
+           return context.graph().hasEntity(entityID) && context.graph().geometry(entityID);
+         }).filter(Boolean));
 
+         var _geometryID = _geometries.length === 1 ? _geometries[0] : 'feature';
 
-           features.clearEntity = function(entity) {
-               delete _cache[osmEntity.key(entity)];
-           };
+         var _extent;
 
+         var _actions = selectedIDs.map(function (entityID) {
+           var graph = context.graph();
+           var entity = graph.hasEntity(entityID);
+           if (!entity || !entity.hasInterestingTags()) return null;
+           if (entity.type === 'node' && graph.parentWays(entity).length === 0) return null;
 
-           features.reset = function() {
-               Array.from(_deferred).forEach(function(handle) {
-                   window.cancelIdleCallback(handle);
-                   _deferred.delete(handle);
-               });
+           if (entity.type !== 'node') {
+             var preset = _mainPresetIndex.match(entity, graph); // only allow extraction from ways/relations if the preset supports points
 
-               _cache = {};
-           };
+             if (preset.geometry.indexOf('point') === -1) return null;
+           }
 
-           // only certain relations are worth checking
-           function relationShouldBeChecked(relation) {
-               // multipolygon features have `area` geometry and aren't checked here
-               return relation.tags.type === 'boundary';
-           }
-
-           features.getMatches = function(entity, resolver, geometry) {
-               if (geometry === 'vertex' ||
-                   (geometry === 'relation' && !relationShouldBeChecked(entity))) return {};
-
-               var ent = osmEntity.key(entity);
-               if (!_cache[ent]) {
-                   _cache[ent] = {};
-               }
-
-               if (!_cache[ent].matches) {
-                   var matches = {};
-                   var hasMatch = false;
-
-                   for (var i = 0; i < _keys.length; i++) {
-                       if (_keys[i] === 'others') {
-                           if (hasMatch) continue;
-
-                           // If an entity...
-                           //   1. is a way that hasn't matched other 'interesting' feature rules,
-                           if (entity.type === 'way') {
-                               var parents = features.getParents(entity, resolver, geometry);
-
-                               //   2a. belongs only to a single multipolygon relation
-                               if ((parents.length === 1 && parents[0].isMultipolygon()) ||
-                                   // 2b. or belongs only to boundary relations
-                                   (parents.length > 0 && parents.every(function(parent) { return parent.tags.type === 'boundary'; }))) {
-
-                                   // ...then match whatever feature rules the parent relation has matched.
-                                   // see #2548, #2887
-                                   //
-                                   // IMPORTANT:
-                                   // For this to work, getMatches must be called on relations before ways.
-                                   //
-                                   var pkey = osmEntity.key(parents[0]);
-                                   if (_cache[pkey] && _cache[pkey].matches) {
-                                       matches = Object.assign({}, _cache[pkey].matches);  // shallow copy
-                                       continue;
-                                   }
-                               }
-                           }
-                       }
+           _extent = _extent ? _extent.extend(entity.extent(graph)) : entity.extent(graph);
+           return actionExtract(entityID);
+         }).filter(Boolean);
 
-                       if (_rules[_keys[i]].filter(entity.tags, geometry)) {
-                           matches[_keys[i]] = hasMatch = true;
-                       }
-                   }
-                   _cache[ent].matches = matches;
-               }
+         var operation = function operation() {
+           var combinedAction = function combinedAction(graph) {
+             _actions.forEach(function (action) {
+               graph = action(graph);
+             });
 
-               return _cache[ent].matches;
+             return graph;
            };
 
+           context.perform(combinedAction, operation.annotation()); // do the extract
 
-           features.getParents = function(entity, resolver, geometry) {
-               if (geometry === 'point') return [];
+           var extractedNodeIDs = _actions.map(function (action) {
+             return action.getExtractedNodeID();
+           });
 
-               var ent = osmEntity.key(entity);
-               if (!_cache[ent]) {
-                   _cache[ent] = {};
-               }
+           context.enter(modeSelect(context, extractedNodeIDs));
+         };
 
-               if (!_cache[ent].parents) {
-                   var parents = [];
-                   if (geometry === 'vertex') {
-                       parents = resolver.parentWays(entity);
-                   } else {   // 'line', 'area', 'relation'
-                       parents = resolver.parentRelations(entity);
-                   }
-                   _cache[ent].parents = parents;
-               }
-               return _cache[ent].parents;
-           };
+         operation.available = function () {
+           return _actions.length && selectedIDs.length === _actions.length;
+         };
 
+         operation.disabled = function () {
+           if (_extent && _extent.percentContainedIn(context.map().extent()) < 0.8) {
+             return 'too_large';
+           } else if (selectedIDs.some(function (entityID) {
+             return context.graph().geometry(entityID) === 'vertex' && context.hasHiddenConnections(entityID);
+           })) {
+             return 'connected_to_hidden';
+           }
 
-           features.isHiddenPreset = function(preset, geometry) {
-               if (!_hidden.length) return false;
-               if (!preset.tags) return false;
+           return false;
+         };
 
-               var test = preset.setTags({}, geometry);
-               for (var key in _rules) {
-                   if (_rules[key].filter(test, geometry)) {
-                       if (_hidden.indexOf(key) !== -1) {
-                           return key;
-                       }
-                       return false;
-                   }
-               }
-               return false;
-           };
+         operation.tooltip = function () {
+           var disableReason = operation.disabled();
 
+           if (disableReason) {
+             return _t('operations.extract.' + disableReason + '.' + _amount);
+           } else {
+             return _t('operations.extract.description.' + _geometryID + '.' + _amount);
+           }
+         };
 
-           features.isHiddenFeature = function(entity, resolver, geometry) {
-               if (!_hidden.length) return false;
-               if (!entity.version) return false;
-               if (_forceVisible[entity.id]) return false;
+         operation.annotation = function () {
+           return _t('operations.extract.annotation', {
+             n: selectedIDs.length
+           });
+         };
 
-               var matches = Object.keys(features.getMatches(entity, resolver, geometry));
-               return matches.length && matches.every(function(k) { return features.hidden(k); });
-           };
+         operation.id = 'extract';
+         operation.keys = [_t('operations.extract.key')];
+         operation.title = _t('operations.extract.title');
+         operation.behavior = behaviorOperation(context).which(operation);
+         return operation;
+       }
 
+       function operationMerge(context, selectedIDs) {
+         var _action = getAction();
+
+         function getAction() {
+           // prefer a non-disabled action first
+           var join = actionJoin(selectedIDs);
+           if (!join.disabled(context.graph())) return join;
+           var merge = actionMerge(selectedIDs);
+           if (!merge.disabled(context.graph())) return merge;
+           var mergePolygon = actionMergePolygon(selectedIDs);
+           if (!mergePolygon.disabled(context.graph())) return mergePolygon;
+           var mergeNodes = actionMergeNodes(selectedIDs);
+           if (!mergeNodes.disabled(context.graph())) return mergeNodes; // otherwise prefer an action with an interesting disabled reason
+
+           if (join.disabled(context.graph()) !== 'not_eligible') return join;
+           if (merge.disabled(context.graph()) !== 'not_eligible') return merge;
+           if (mergePolygon.disabled(context.graph()) !== 'not_eligible') return mergePolygon;
+           return mergeNodes;
+         }
+
+         var operation = function operation() {
+           if (operation.disabled()) return;
+           context.perform(_action, operation.annotation());
+           context.validator().validate();
+           var resultIDs = selectedIDs.filter(context.hasEntity);
+
+           if (resultIDs.length > 1) {
+             var interestingIDs = resultIDs.filter(function (id) {
+               return context.entity(id).hasInterestingTags();
+             });
+             if (interestingIDs.length) resultIDs = interestingIDs;
+           }
 
-           features.isHiddenChild = function(entity, resolver, geometry) {
-               if (!_hidden.length) return false;
-               if (!entity.version || geometry === 'point') return false;
-               if (_forceVisible[entity.id]) return false;
+           context.enter(modeSelect(context, resultIDs));
+         };
 
-               var parents = features.getParents(entity, resolver, geometry);
-               if (!parents.length) return false;
+         operation.available = function () {
+           return selectedIDs.length >= 2;
+         };
 
-               for (var i = 0; i < parents.length; i++) {
-                   if (!features.isHidden(parents[i], resolver, parents[i].geometry(resolver))) {
-                       return false;
-                   }
-               }
-               return true;
-           };
+         operation.disabled = function () {
+           var actionDisabled = _action.disabled(context.graph());
 
+           if (actionDisabled) return actionDisabled;
+           var osm = context.connection();
 
-           features.hasHiddenConnections = function(entity, resolver) {
-               if (!_hidden.length) return false;
+           if (osm && _action.resultingWayNodesLength && _action.resultingWayNodesLength(context.graph()) > osm.maxWayNodes()) {
+             return 'too_many_vertices';
+           }
 
-               var childNodes, connections;
-               if (entity.type === 'midpoint') {
-                   childNodes = [resolver.entity(entity.edge[0]), resolver.entity(entity.edge[1])];
-                   connections = [];
-               } else {
-                   childNodes = entity.nodes ? resolver.childNodes(entity) : [];
-                   connections = features.getParents(entity, resolver, entity.geometry(resolver));
-               }
+           return false;
+         };
 
-               // gather ways connected to child nodes..
-               connections = childNodes.reduce(function(result, e) {
-                   return resolver.isShared(e) ? utilArrayUnion(result, resolver.parentWays(e)) : result;
-               }, connections);
+         operation.tooltip = function () {
+           var disabled = operation.disabled();
 
-               return connections.some(function(e) {
-                   return features.isHidden(e, resolver, e.geometry(resolver));
+           if (disabled) {
+             if (disabled === 'restriction') {
+               return _t('operations.merge.restriction', {
+                 relation: _mainPresetIndex.item('type/restriction').name()
                });
-           };
+             }
 
+             return _t('operations.merge.' + disabled);
+           }
 
-           features.isHidden = function(entity, resolver, geometry) {
-               if (!_hidden.length) return false;
-               if (!entity.version) return false;
+           return _t('operations.merge.description');
+         };
 
-               var fn = (geometry === 'vertex' ? features.isHiddenChild : features.isHiddenFeature);
-               return fn(entity, resolver, geometry);
-           };
+         operation.annotation = function () {
+           return _t('operations.merge.annotation', {
+             n: selectedIDs.length
+           });
+         };
 
+         operation.id = 'merge';
+         operation.keys = [_t('operations.merge.key')];
+         operation.title = _t('operations.merge.title');
+         operation.behavior = behaviorOperation(context).which(operation);
+         return operation;
+       }
 
-           features.filter = function(d, resolver) {
-               if (!_hidden.length) return d;
+       function operationPaste(context) {
+         var _pastePoint;
 
-               var result = [];
-               for (var i = 0; i < d.length; i++) {
-                   var entity = d[i];
-                   if (!features.isHidden(entity, resolver, entity.geometry(resolver))) {
-                       result.push(entity);
-                   }
-               }
-               return result;
-           };
+         var operation = function operation() {
+           if (!_pastePoint) return;
+           var oldIDs = context.copyIDs();
+           if (!oldIDs.length) return;
+           var projection = context.projection;
+           var extent = geoExtent();
+           var oldGraph = context.copyGraph();
+           var newIDs = [];
+           var action = actionCopyEntities(oldIDs, oldGraph);
+           context.perform(action);
+           var copies = action.copies();
+           var originals = new Set();
+           Object.values(copies).forEach(function (entity) {
+             originals.add(entity.id);
+           });
 
+           for (var id in copies) {
+             var oldEntity = oldGraph.entity(id);
+             var newEntity = copies[id];
 
-           features.forceVisible = function(entityIDs) {
-               if (!arguments.length) return Object.keys(_forceVisible);
+             extent._extend(oldEntity.extent(oldGraph)); // Exclude child nodes from newIDs if their parent way was also copied.
 
-               _forceVisible = {};
-               for (var i = 0; i < entityIDs.length; i++) {
-                   _forceVisible[entityIDs[i]] = true;
-                   var entity = context.hasEntity(entityIDs[i]);
-                   if (entity && entity.type === 'relation') {
-                       // also show relation members (one level deep)
-                       for (var j in entity.members) {
-                           _forceVisible[entity.members[j].id] = true;
-                       }
-                   }
-               }
-               return features;
-           };
 
+             var parents = context.graph().parentWays(newEntity);
+             var parentCopied = parents.some(function (parent) {
+               return originals.has(parent.id);
+             });
 
-           features.init = function() {
-               var storage = corePreferences('disabled-features');
-               if (storage) {
-                   var storageDisabled = storage.replace(/;/g, ',').split(',');
-                   storageDisabled.forEach(features.disable);
-               }
+             if (!parentCopied) {
+               newIDs.push(newEntity.id);
+             }
+           } // Use the location of the copy operation to offset the paste location,
+           // or else use the center of the pasted extent
 
-               var hash = utilStringQs(window.location.hash);
-               if (hash.disable_features) {
-                   var hashDisabled = hash.disable_features.replace(/;/g, ',').split(',');
-                   hashDisabled.forEach(features.disable);
-               }
-           };
 
+           var copyPoint = context.copyLonLat() && projection(context.copyLonLat()) || projection(extent.center());
+           var delta = geoVecSubtract(_pastePoint, copyPoint); // Move the pasted objects to be anchored at the paste location
 
-           // warm up the feature matching cache upon merging fetched data
-           context.history().on('merge.features', function(newEntities) {
-               if (!newEntities) return;
-               var handle = window.requestIdleCallback(function() {
-                   var graph = context.graph();
-                   var types = utilArrayGroupBy(newEntities, 'type');
-                   // ensure that getMatches is called on relations before ways
-                   var entities = [].concat(types.relation || [], types.way || [], types.node || []);
-                   for (var i = 0; i < entities.length; i++) {
-                       var geometry = entities[i].geometry(graph);
-                       features.getMatches(entities[i], graph, geometry);
-                   }
-               });
-               _deferred.add(handle);
+           context.replace(actionMove(newIDs, delta, projection), operation.annotation());
+           context.enter(modeSelect(context, newIDs));
+         };
+
+         operation.point = function (val) {
+           _pastePoint = val;
+           return operation;
+         };
+
+         operation.available = function () {
+           return context.mode().id === 'browse';
+         };
+
+         operation.disabled = function () {
+           return !context.copyIDs().length;
+         };
+
+         operation.tooltip = function () {
+           var oldGraph = context.copyGraph();
+           var ids = context.copyIDs();
+
+           if (!ids.length) {
+             return _t('operations.paste.nothing_copied');
+           }
+
+           return _t('operations.paste.description', {
+             feature: utilDisplayLabel(oldGraph.entity(ids[0]), oldGraph),
+             n: ids.length
            });
+         };
 
+         operation.annotation = function () {
+           var ids = context.copyIDs();
+           return _t('operations.paste.annotation', {
+             n: ids.length
+           });
+         };
 
-           return features;
+         operation.id = 'paste';
+         operation.keys = [uiCmd('⌘V')];
+         operation.title = _t('operations.paste.title');
+         return operation;
        }
 
-       // Touch targets control which other vertices we can drag a vertex onto.
-       //
-       // - the activeID - nope
-       // - 1 away (adjacent) to the activeID - yes (vertices will be merged)
-       // - 2 away from the activeID - nope (would create a self intersecting segment)
-       // - all others on a linear way - yes
-       // - all others on a closed way - nope (would create a self intersecting polygon)
-       //
-       // returns
-       // 0 = active vertex - no touch/connect
-       // 1 = passive vertex - yes touch/connect
-       // 2 = adjacent vertex - yes but pay attention segmenting a line here
-       //
-       function svgPassiveVertex(node, graph, activeID) {
-           if (!activeID) return 1;
-           if (activeID === node.id) return 0;
+       function operationReverse(context, selectedIDs) {
+         var operation = function operation() {
+           context.perform(function combinedReverseAction(graph) {
+             actions().forEach(function (action) {
+               graph = action(graph);
+             });
+             return graph;
+           }, operation.annotation());
+           context.validator().validate();
+         };
+
+         function actions(situation) {
+           return selectedIDs.map(function (entityID) {
+             var entity = context.hasEntity(entityID);
+             if (!entity) return null;
 
-           var parents = graph.parentWays(node);
+             if (situation === 'toolbar') {
+               if (entity.type === 'way' && !entity.isOneWay() && !entity.isSided()) return null;
+             }
 
-           var i, j, nodes, isClosed, ix1, ix2, ix3, ix4, max;
+             var geometry = entity.geometry(context.graph());
+             if (entity.type !== 'node' && geometry !== 'line') return null;
+             var action = actionReverse(entityID);
+             if (action.disabled(context.graph())) return null;
+             return action;
+           }).filter(Boolean);
+         }
 
-           for (i = 0; i < parents.length; i++) {
-               nodes = parents[i].nodes;
-               isClosed = parents[i].isClosed();
-               for (j = 0; j < nodes.length; j++) {   // find this vertex, look nearby
-                   if (nodes[j] === node.id) {
-                       ix1 = j - 2;
-                       ix2 = j - 1;
-                       ix3 = j + 1;
-                       ix4 = j + 2;
-
-                       if (isClosed) {  // wraparound if needed
-                           max = nodes.length - 1;
-                           if (ix1 < 0)   ix1 = max + ix1;
-                           if (ix2 < 0)   ix2 = max + ix2;
-                           if (ix3 > max) ix3 = ix3 - max;
-                           if (ix4 > max) ix4 = ix4 - max;
-                       }
+         function reverseTypeID() {
+           var acts = actions();
+           var nodeActionCount = acts.filter(function (act) {
+             var entity = context.hasEntity(act.entityID());
+             return entity && entity.type === 'node';
+           }).length;
+           if (nodeActionCount === 0) return 'line';
+           if (nodeActionCount === acts.length) return 'point';
+           return 'feature';
+         }
 
-                       if (nodes[ix1] === activeID) return 0;        // no - prevent self intersect
-                       else if (nodes[ix2] === activeID) return 2;   // ok - adjacent
-                       else if (nodes[ix3] === activeID) return 2;   // ok - adjacent
-                       else if (nodes[ix4] === activeID) return 0;   // no - prevent self intersect
-                       else if (isClosed && nodes.indexOf(activeID) !== -1) return 0;  // no - prevent self intersect
-                   }
-               }
-           }
+         operation.available = function (situation) {
+           return actions(situation).length > 0;
+         };
 
-           return 1;   // ok
-       }
-
-
-       function svgMarkerSegments(projection, graph, dt,
-                                         shouldReverse,
-                                         bothDirections) {
-           return function(entity) {
-               var i = 0;
-               var offset = dt;
-               var segments = [];
-               var clip = d3_geoIdentity().clipExtent(projection.clipExtent()).stream;
-               var coordinates = graph.childNodes(entity).map(function(n) { return n.loc; });
-               var a, b;
-
-               if (shouldReverse(entity)) {
-                   coordinates.reverse();
-               }
-
-               d3_geoStream({
-                   type: 'LineString',
-                   coordinates: coordinates
-               }, projection.stream(clip({
-                   lineStart: function() {},
-                   lineEnd: function() { a = null; },
-                   point: function(x, y) {
-                       b = [x, y];
-
-                       if (a) {
-                           var span = geoVecLength(a, b) - offset;
-
-                           if (span >= 0) {
-                               var heading = geoVecAngle(a, b);
-                               var dx = dt * Math.cos(heading);
-                               var dy = dt * Math.sin(heading);
-                               var p = [
-                                   a[0] + offset * Math.cos(heading),
-                                   a[1] + offset * Math.sin(heading)
-                               ];
-
-                               // gather coordinates
-                               var coord = [a, p];
-                               for (span -= dt; span >= 0; span -= dt) {
-                                   p = geoVecAdd(p, [dx, dy]);
-                                   coord.push(p);
-                               }
-                               coord.push(b);
-
-                               // generate svg paths
-                               var segment = '';
-                               var j;
-
-                               for (j = 0; j < coord.length; j++) {
-                                   segment += (j === 0 ? 'M' : 'L') + coord[j][0] + ',' + coord[j][1];
-                               }
-                               segments.push({ id: entity.id, index: i++, d: segment });
-
-                               if (bothDirections(entity)) {
-                                   segment = '';
-                                   for (j = coord.length - 1; j >= 0; j--) {
-                                       segment += (j === coord.length - 1 ? 'M' : 'L') + coord[j][0] + ',' + coord[j][1];
-                                   }
-                                   segments.push({ id: entity.id, index: i++, d: segment });
-                               }
-                           }
+         operation.disabled = function () {
+           return false;
+         };
 
-                           offset = -span;
-                       }
+         operation.tooltip = function () {
+           return _t('operations.reverse.description.' + reverseTypeID());
+         };
 
-                       a = b;
-                   }
-               })));
+         operation.annotation = function () {
+           var acts = actions();
+           return _t('operations.reverse.annotation.' + reverseTypeID(), {
+             n: acts.length
+           });
+         };
 
-               return segments;
-           };
+         operation.id = 'reverse';
+         operation.keys = [_t('operations.reverse.key')];
+         operation.title = _t('operations.reverse.title');
+         operation.behavior = behaviorOperation(context).which(operation);
+         return operation;
        }
 
+       function operationSplit(context, selectedIDs) {
+         var _vertexIds = selectedIDs.filter(function (id) {
+           return context.graph().geometry(id) === 'vertex';
+         });
 
-       function svgPath(projection, graph, isArea) {
-
-           // Explanation of magic numbers:
-           // "padding" here allows space for strokes to extend beyond the viewport,
-           // so that the stroke isn't drawn along the edge of the viewport when
-           // the shape is clipped.
-           //
-           // When drawing lines, pad viewport by 5px.
-           // When drawing areas, pad viewport by 65px in each direction to allow
-           // for 60px area fill stroke (see ".fill-partial path.fill" css rule)
+         var _selectedWayIds = selectedIDs.filter(function (id) {
+           var entity = context.graph().hasEntity(id);
+           return entity && entity.type === 'way';
+         });
 
-           var cache = {};
-           var padding = isArea ? 65 : 5;
-           var viewport = projection.clipExtent();
-           var paddedExtent = [
-               [viewport[0][0] - padding, viewport[0][1] - padding],
-               [viewport[1][0] + padding, viewport[1][1] + padding]
-           ];
-           var clip = d3_geoIdentity().clipExtent(paddedExtent).stream;
-           var project = projection.stream;
-           var path = d3_geoPath()
-               .projection({stream: function(output) { return project(clip(output)); }});
-
-           var svgpath = function(entity) {
-               if (entity.id in cache) {
-                   return cache[entity.id];
-               } else {
-                   return cache[entity.id] = path(entity.asGeoJSON(graph));
-               }
-           };
+         var _isAvailable = _vertexIds.length > 0 && _vertexIds.length + _selectedWayIds.length === selectedIDs.length;
 
-           svgpath.geojson = function(d) {
-               if (d.__featurehash__ !== undefined) {
-                   if (d.__featurehash__ in cache) {
-                       return cache[d.__featurehash__];
-                   } else {
-                       return cache[d.__featurehash__] = path(d);
-                   }
-               } else {
-                   return path(d);
-               }
-           };
+         var _action = actionSplit(_vertexIds);
 
-           return svgpath;
-       }
+         var _ways = [];
+         var _geometry = 'feature';
+         var _waysAmount = 'single';
 
+         var _nodesAmount = _vertexIds.length === 1 ? 'single' : 'multiple';
 
-       function svgPointTransform(projection) {
-           var svgpoint = function(entity) {
-               // http://jsperf.com/short-array-join
-               var pt = projection(entity.loc);
-               return 'translate(' + pt[0] + ',' + pt[1] + ')';
-           };
+         if (_isAvailable) {
+           if (_selectedWayIds.length) _action.limitWays(_selectedWayIds);
+           _ways = _action.ways(context.graph());
+           var geometries = {};
 
-           svgpoint.geojson = function(d) {
-               return svgpoint(d.properties.entity);
-           };
+           _ways.forEach(function (way) {
+             geometries[way.geometry(context.graph())] = true;
+           });
 
-           return svgpoint;
-       }
+           if (Object.keys(geometries).length === 1) {
+             _geometry = Object.keys(geometries)[0];
+           }
 
+           _waysAmount = _ways.length === 1 ? 'single' : 'multiple';
+         }
 
-       function svgRelationMemberTags(graph) {
-           return function(entity) {
-               var tags = entity.tags;
-               var shouldCopyMultipolygonTags = !entity.hasInterestingTags();
-               graph.parentRelations(entity).forEach(function(relation) {
-                   var type = relation.tags.type;
-                   if ((type === 'multipolygon' && shouldCopyMultipolygonTags) || type === 'boundary') {
-                       tags = Object.assign({}, relation.tags, tags);
-                   }
-               });
-               return tags;
-           };
-       }
+         var operation = function operation() {
+           var difference = context.perform(_action, operation.annotation()); // select both the nodes and the ways so the mapper can immediately disconnect them if desired
 
+           var idsToSelect = _vertexIds.concat(difference.extantIDs().filter(function (id) {
+             // filter out relations that may have had member additions
+             return context.entity(id).type === 'way';
+           }));
 
-       function svgSegmentWay(way, graph, activeID) {
-           // When there is no activeID, we can memoize this expensive computation
-           if (activeID === undefined) {
-               return graph.transient(way, 'waySegments', getWaySegments);
-           } else {
-               return getWaySegments();
-           }
-
-           function getWaySegments() {
-               var isActiveWay = (way.nodes.indexOf(activeID) !== -1);
-               var features = { passive: [], active: [] };
-               var start = {};
-               var end = {};
-               var node, type;
-
-               for (var i = 0; i < way.nodes.length; i++) {
-                   node = graph.entity(way.nodes[i]);
-                   type = svgPassiveVertex(node, graph, activeID);
-                   end = { node: node, type: type };
-
-                   if (start.type !== undefined) {
-                       if (start.node.id === activeID || end.node.id === activeID) ; else if (isActiveWay && (start.type === 2 || end.type === 2)) {   // one adjacent vertex
-                           pushActive(start, end, i);
-                       } else if (start.type === 0 && end.type === 0) {   // both active vertices
-                           pushActive(start, end, i);
-                       } else {
-                           pushPassive(start, end, i);
-                       }
-                   }
+           context.enter(modeSelect(context, idsToSelect));
+         };
 
-                   start = end;
-               }
+         operation.relatedEntityIds = function () {
+           return _selectedWayIds.length ? [] : _ways.map(function (way) {
+             return way.id;
+           });
+         };
 
-               return features;
+         operation.available = function () {
+           return _isAvailable;
+         };
 
-               function pushActive(start, end, index) {
-                   features.active.push({
-                       type: 'Feature',
-                       id: way.id + '-' + index + '-nope',
-                       properties: {
-                           nope: true,
-                           target: true,
-                           entity: way,
-                           nodes: [start.node, end.node],
-                           index: index
-                       },
-                       geometry: {
-                           type: 'LineString',
-                           coordinates: [start.node.loc, end.node.loc]
-                       }
-                   });
-               }
+         operation.disabled = function () {
+           var reason = _action.disabled(context.graph());
 
-               function pushPassive(start, end, index) {
-                   features.passive.push({
-                       type: 'Feature',
-                       id: way.id + '-' + index,
-                       properties: {
-                           target: true,
-                           entity: way,
-                           nodes: [start.node, end.node],
-                           index: index
-                       },
-                       geometry: {
-                           type: 'LineString',
-                           coordinates: [start.node.loc, end.node.loc]
-                       }
-                   });
-               }
+           if (reason) {
+             return reason;
+           } else if (selectedIDs.some(context.hasHiddenConnections)) {
+             return 'connected_to_hidden';
            }
+
+           return false;
+         };
+
+         operation.tooltip = function () {
+           var disable = operation.disabled();
+           if (disable) return _t('operations.split.' + disable);
+           return _t('operations.split.description.' + _geometry + '.' + _waysAmount + '.' + _nodesAmount + '_node');
+         };
+
+         operation.annotation = function () {
+           return _t('operations.split.annotation.' + _geometry, {
+             n: _ways.length
+           });
+         };
+
+         operation.id = 'split';
+         operation.keys = [_t('operations.split.key')];
+         operation.title = _t('operations.split.title');
+         operation.behavior = behaviorOperation(context).which(operation);
+         return operation;
        }
 
-       function svgTagClasses() {
-           var primaries = [
-               'building', 'highway', 'railway', 'waterway', 'aeroway', 'aerialway',
-               'piste:type', 'boundary', 'power', 'amenity', 'natural', 'landuse',
-               'leisure', 'military', 'place', 'man_made', 'route', 'attraction',
-               'building:part', 'indoor'
-           ];
-           var statuses = [
-               // nonexistent, might be built
-               'proposed', 'planned',
-               // under maintentance or between groundbreaking and opening
-               'construction',
-               // existent but not functional
-               'disused',
-               // dilapidated to nonexistent
-               'abandoned',
-               // nonexistent, still may appear in imagery
-               'dismantled', 'razed', 'demolished', 'obliterated',
-               // existent occasionally, e.g. stormwater drainage basin
-               'intermittent'
-           ];
-           var secondaries = [
-               'oneway', 'bridge', 'tunnel', 'embankment', 'cutting', 'barrier',
-               'surface', 'tracktype', 'footway', 'crossing', 'service', 'sport',
-               'public_transport', 'location', 'parking', 'golf', 'type', 'leisure',
-               'man_made', 'indoor'
-           ];
-           var _tags = function(entity) { return entity.tags; };
-
-
-           var tagClasses = function(selection) {
-               selection.each(function tagClassesEach(entity) {
-                   var value = this.className;
-
-                   if (value.baseVal !== undefined) {
-                       value = value.baseVal;
-                   }
+       function operationStraighten(context, selectedIDs) {
+         var _wayIDs = selectedIDs.filter(function (id) {
+           return id.charAt(0) === 'w';
+         });
 
-                   var t = _tags(entity);
+         var _nodeIDs = selectedIDs.filter(function (id) {
+           return id.charAt(0) === 'n';
+         });
 
-                   var computed = tagClasses.getClassesString(t, value);
+         var _amount = (_wayIDs.length ? _wayIDs : _nodeIDs).length === 1 ? 'single' : 'multiple';
 
-                   if (computed !== value) {
-                       select(this).attr('class', computed);
-                   }
-               });
-           };
+         var _nodes = utilGetAllNodes(selectedIDs, context.graph());
 
+         var _coords = _nodes.map(function (n) {
+           return n.loc;
+         });
 
-           tagClasses.getClassesString = function(t, value) {
-               var primary, status;
-               var i, j, k, v;
+         var _extent = utilTotalExtent(selectedIDs, context.graph());
 
-               // in some situations we want to render perimeter strokes a certain way
-               var overrideGeometry;
-               if (/\bstroke\b/.test(value)) {
-                   if (!!t.barrier && t.barrier !== 'no') {
-                       overrideGeometry = 'line';
-                   }
+         var _action = chooseAction();
+
+         var _geometry;
+
+         function chooseAction() {
+           // straighten selected nodes
+           if (_wayIDs.length === 0 && _nodeIDs.length > 2) {
+             _geometry = 'point';
+             return actionStraightenNodes(_nodeIDs, context.projection); // straighten selected ways (possibly between range of 2 selected nodes)
+           } else if (_wayIDs.length > 0 && (_nodeIDs.length === 0 || _nodeIDs.length === 2)) {
+             var startNodeIDs = [];
+             var endNodeIDs = [];
+
+             for (var i = 0; i < selectedIDs.length; i++) {
+               var entity = context.entity(selectedIDs[i]);
+
+               if (entity.type === 'node') {
+                 continue;
+               } else if (entity.type !== 'way' || entity.isClosed()) {
+                 return null; // exit early, can't straighten these
                }
 
-               // preserve base classes (nothing with `tag-`)
-               var classes = value.trim().split(/\s+/)
-                   .filter(function(klass) {
-                       return klass.length && !/^tag-/.test(klass);
-                   })
-                   .map(function(klass) {  // special overrides for some perimeter strokes
-                       return (klass === 'line' || klass === 'area') ? (overrideGeometry || klass) : klass;
-                   });
+               startNodeIDs.push(entity.first());
+               endNodeIDs.push(entity.last());
+             } // Remove duplicate end/startNodeIDs (duplicate nodes cannot be at the line end)
+
+
+             startNodeIDs = startNodeIDs.filter(function (n) {
+               return startNodeIDs.indexOf(n) === startNodeIDs.lastIndexOf(n);
+             });
+             endNodeIDs = endNodeIDs.filter(function (n) {
+               return endNodeIDs.indexOf(n) === endNodeIDs.lastIndexOf(n);
+             }); // Ensure all ways are connected (i.e. only 2 unique endpoints/startpoints)
+
+             if (utilArrayDifference(startNodeIDs, endNodeIDs).length + utilArrayDifference(endNodeIDs, startNodeIDs).length !== 2) return null; // Ensure path contains at least 3 unique nodes
 
-               // pick at most one primary classification tag..
-               for (i = 0; i < primaries.length; i++) {
-                   k = primaries[i];
-                   v = t[k];
-                   if (!v || v === 'no') continue;
+             var wayNodeIDs = utilGetAllNodes(_wayIDs, context.graph()).map(function (node) {
+               return node.id;
+             });
+             if (wayNodeIDs.length <= 2) return null; // If range of 2 selected nodes is supplied, ensure nodes lie on the selected path
 
-                   if (k === 'piste:type') {  // avoid a ':' in the class name
-                       k = 'piste';
-                   } else if (k === 'building:part') {  // avoid a ':' in the class name
-                       k = 'building_part';
-                   }
+             if (_nodeIDs.length === 2 && (wayNodeIDs.indexOf(_nodeIDs[0]) === -1 || wayNodeIDs.indexOf(_nodeIDs[1]) === -1)) return null;
 
-                   primary = k;
-                   if (statuses.indexOf(v) !== -1) {   // e.g. `railway=abandoned`
-                       status = v;
-                       classes.push('tag-' + k);
-                   } else {
-                       classes.push('tag-' + k);
-                       classes.push('tag-' + k + '-' + v);
-                   }
+             if (_nodeIDs.length) {
+               // If we're only straightenting between two points, we only need that extent visible
+               _extent = utilTotalExtent(_nodeIDs, context.graph());
+             }
 
-                   break;
-               }
+             _geometry = 'line';
+             return actionStraightenWay(selectedIDs, context.projection);
+           }
 
-               if (!primary) {
-                   for (i = 0; i < statuses.length; i++) {
-                       for (j = 0; j < primaries.length; j++) {
-                           k = statuses[i] + ':' + primaries[j];  // e.g. `demolished:building=yes`
-                           v = t[k];
-                           if (!v || v === 'no') continue;
+           return null;
+         }
 
-                           status = statuses[i];
-                           break;
-                       }
-                   }
-               }
+         function operation() {
+           if (!_action) return;
+           context.perform(_action, operation.annotation());
+           window.setTimeout(function () {
+             context.validator().validate();
+           }, 300); // after any transition
+         }
+
+         operation.available = function () {
+           return Boolean(_action);
+         };
 
-               // add at most one status tag, only if relates to primary tag..
-               if (!status) {
-                   for (i = 0; i < statuses.length; i++) {
-                       k = statuses[i];
-                       v = t[k];
-                       if (!v || v === 'no') continue;
+         operation.disabled = function () {
+           var reason = _action.disabled(context.graph());
 
-                       if (v === 'yes') {   // e.g. `railway=rail + abandoned=yes`
-                           status = k;
-                       }
-                       else if (primary && primary === v) {  // e.g. `railway=rail + abandoned=railway`
-                           status = k;
-                       } else if (!primary && primaries.indexOf(v) !== -1) {  // e.g. `abandoned=railway`
-                           status = k;
-                           primary = v;
-                           classes.push('tag-' + v);
-                       }  // else ignore e.g.  `highway=path + abandoned=railway`
-
-                       if (status) break;
-                   }
-               }
+           if (reason) {
+             return reason;
+           } else if (_extent.percentContainedIn(context.map().extent()) < 0.8) {
+             return 'too_large';
+           } else if (someMissing()) {
+             return 'not_downloaded';
+           } else if (selectedIDs.some(context.hasHiddenConnections)) {
+             return 'connected_to_hidden';
+           }
 
-               if (status) {
-                   classes.push('tag-status');
-                   classes.push('tag-status-' + status);
-               }
+           return false;
 
-               // add any secondary tags
-               for (i = 0; i < secondaries.length; i++) {
-                   k = secondaries[i];
-                   v = t[k];
-                   if (!v || v === 'no' || k === primary) continue;
-                   classes.push('tag-' + k);
-                   classes.push('tag-' + k + '-' + v);
-               }
+           function someMissing() {
+             if (context.inIntro()) return false;
+             var osm = context.connection();
 
-               // For highways, look for surface tagging..
-               if ((primary === 'highway' && !osmPathHighwayTagValues[t.highway]) || primary === 'aeroway') {
-                   var surface = t.highway === 'track' ? 'unpaved' : 'paved';
-                   for (k in t) {
-                       v = t[k];
-                       if (k in osmPavedTags) {
-                           surface = osmPavedTags[k][v] ? 'paved' : 'unpaved';
-                       }
-                       if (k in osmSemipavedTags && !!osmSemipavedTags[k][v]) {
-                           surface = 'semipaved';
-                       }
-                   }
-                   classes.push('tag-' + surface);
-               }
+             if (osm) {
+               var missing = _coords.filter(function (loc) {
+                 return !osm.isDataLoaded(loc);
+               });
 
-               // If this is a wikidata-tagged item, add a class for that..
-               if (t.wikidata || t['brand:wikidata']) {
-                   classes.push('tag-wikidata');
+               if (missing.length) {
+                 missing.forEach(function (loc) {
+                   context.loadTileAtLoc(loc);
+                 });
+                 return true;
                }
+             }
 
-               return classes.join(' ').trim();
-           };
+             return false;
+           }
+         };
 
+         operation.tooltip = function () {
+           var disable = operation.disabled();
+           return disable ? _t('operations.straighten.' + disable + '.' + _amount) : _t('operations.straighten.description.' + _geometry + (_wayIDs.length === 1 ? '' : 's'));
+         };
 
-           tagClasses.tags = function(val) {
-               if (!arguments.length) return _tags;
-               _tags = val;
-               return tagClasses;
-           };
+         operation.annotation = function () {
+           return _t('operations.straighten.annotation.' + _geometry, {
+             n: _wayIDs.length ? _wayIDs.length : _nodeIDs.length
+           });
+         };
 
-           return tagClasses;
+         operation.id = 'straighten';
+         operation.keys = [_t('operations.straighten.key')];
+         operation.title = _t('operations.straighten.title');
+         operation.behavior = behaviorOperation(context).which(operation);
+         return operation;
        }
 
-       // Patterns only work in Firefox when set directly on element.
-       // (This is not a bug: https://bugzilla.mozilla.org/show_bug.cgi?id=750632)
-       var patterns = {
-           // tag - pattern name
-           // -or-
-           // tag - value - pattern name
-           // -or-
-           // tag - value - rules (optional tag-values, pattern name)
-           // (matches earlier rules first, so fallback should be last entry)
-           amenity: {
-               grave_yard: 'cemetery',
-               fountain: 'water_standing'
-           },
-           landuse: {
-               cemetery: [
-                   { religion: 'christian', pattern: 'cemetery_christian' },
-                   { religion: 'buddhist', pattern: 'cemetery_buddhist' },
-                   { religion: 'muslim', pattern: 'cemetery_muslim' },
-                   { religion: 'jewish', pattern: 'cemetery_jewish' },
-                   { pattern: 'cemetery' }
-               ],
-               construction: 'construction',
-               farmland: 'farmland',
-               farmyard: 'farmyard',
-               forest: [
-                   { leaf_type: 'broadleaved', pattern: 'forest_broadleaved' },
-                   { leaf_type: 'needleleaved', pattern: 'forest_needleleaved' },
-                   { leaf_type: 'leafless', pattern: 'forest_leafless' },
-                   { pattern: 'forest' } // same as 'leaf_type:mixed'
-               ],
-               grave_yard: 'cemetery',
-               grass: [
-                   { golf: 'green', pattern: 'golf_green' },
-                   { pattern: 'grass' },
-               ],
-               landfill: 'landfill',
-               meadow: 'meadow',
-               military: 'construction',
-               orchard: 'orchard',
-               quarry: 'quarry',
-               vineyard: 'vineyard'
-           },
-           natural: {
-               beach: 'beach',
-               grassland: 'grass',
-               sand: 'beach',
-               scrub: 'scrub',
-               water: [
-                   { water: 'pond', pattern: 'pond' },
-                   { water: 'reservoir', pattern: 'water_standing' },
-                   { pattern: 'waves' }
-               ],
-               wetland: [
-                   { wetland: 'marsh', pattern: 'wetland_marsh' },
-                   { wetland: 'swamp', pattern: 'wetland_swamp' },
-                   { wetland: 'bog', pattern: 'wetland_bog' },
-                   { wetland: 'reedbed', pattern: 'wetland_reedbed' },
-                   { pattern: 'wetland' }
-               ],
-               wood: [
-                   { leaf_type: 'broadleaved', pattern: 'forest_broadleaved' },
-                   { leaf_type: 'needleleaved', pattern: 'forest_needleleaved' },
-                   { leaf_type: 'leafless', pattern: 'forest_leafless' },
-                   { pattern: 'forest' } // same as 'leaf_type:mixed'
-               ]
-           },
-           traffic_calming: {
-               island: [
-                   { surface: 'grass', pattern: 'grass' },
-               ],
-               chicane: [
-                   { surface: 'grass', pattern: 'grass' },
-               ],
-               choker: [
-                   { surface: 'grass', pattern: 'grass' },
-               ]
-           }
-       };
+       var Operations = /*#__PURE__*/Object.freeze({
+               __proto__: null,
+               operationCircularize: operationCircularize,
+               operationContinue: operationContinue,
+               operationCopy: operationCopy,
+               operationDelete: operationDelete,
+               operationDisconnect: operationDisconnect,
+               operationDowngrade: operationDowngrade,
+               operationExtract: operationExtract,
+               operationMerge: operationMerge,
+               operationMove: operationMove,
+               operationOrthogonalize: operationOrthogonalize,
+               operationPaste: operationPaste,
+               operationReflectShort: operationReflectShort,
+               operationReflectLong: operationReflectLong,
+               operationReverse: operationReverse,
+               operationRotate: operationRotate,
+               operationSplit: operationSplit,
+               operationStraighten: operationStraighten
+       });
 
-       function svgTagPattern(tags) {
-           // Skip pattern filling if this is a building (buildings don't get patterns applied)
-           if (tags.building && tags.building !== 'no') {
-               return null;
-           }
+       var _relatedParent;
 
-           for (var tag in patterns) {
-               var entityValue = tags[tag];
-               if (!entityValue) continue;
+       function modeSelect(context, selectedIDs) {
+         var mode = {
+           id: 'select',
+           button: 'browse'
+         };
+         var keybinding = utilKeybinding('select');
 
-               if (typeof patterns[tag] === 'string') { // extra short syntax (just tag) - pattern name
-                   return 'pattern-' + patterns[tag];
-               } else {
-                   var values = patterns[tag];
-                   for (var value in values) {
-                       if (entityValue !== value) continue;
+         var _breatheBehavior = behaviorBreathe();
 
-                       var rules = values[value];
-                       if (typeof rules === 'string') { // short syntax - pattern name
-                           return 'pattern-' + rules;
-                       }
+         var _modeDragNode = modeDragNode(context);
 
-                       // long syntax - rule array
-                       for (var ruleKey in rules) {
-                           var rule = rules[ruleKey];
-
-                           var pass = true;
-                           for (var criterion in rule) {
-                               if (criterion !== 'pattern') { // reserved for pattern name
-                                   // The only rule is a required tag-value pair
-                                   var v = tags[criterion];
-                                   if (!v || v !== rule[criterion]) {
-                                       pass = false;
-                                       break;
-                                   }
-                               }
-                           }
+         var _selectBehavior;
 
-                           if (pass) {
-                               return 'pattern-' + rule.pattern;
-                           }
-                       }
-                   }
-               }
+         var _behaviors = [];
+         var _operations = [];
+         var _newFeature = false;
+         var _follow = false;
+
+         function singular() {
+           if (selectedIDs && selectedIDs.length === 1) {
+             return context.hasEntity(selectedIDs[0]);
            }
+         }
 
-           return null;
-       }
+         function selectedEntities() {
+           return selectedIDs.map(function (id) {
+             return context.hasEntity(id);
+           }).filter(Boolean);
+         }
 
-       function svgAreas(projection, context) {
+         function checkSelectedIDs() {
+           var ids = [];
 
+           if (Array.isArray(selectedIDs)) {
+             ids = selectedIDs.filter(function (id) {
+               return context.hasEntity(id);
+             });
+           }
 
-           function getPatternStyle(tags) {
-               var imageID = svgTagPattern(tags);
-               if (imageID) {
-                   return 'url("#ideditor-' + imageID + '")';
-               }
-               return '';
+           if (!ids.length) {
+             context.enter(modeBrowse(context));
+             return false;
+           } else if (selectedIDs.length > 1 && ids.length === 1 || selectedIDs.length === 1 && ids.length > 1) {
+             // switch between single- and multi-select UI
+             context.enter(modeSelect(context, ids));
+             return false;
            }
 
+           selectedIDs = ids;
+           return true;
+         } // find the common parent ways for nextVertex, previousVertex
 
-           function drawTargets(selection, graph, entities, filter) {
-               var targetClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
-               var nopeClass = context.getDebug('target') ? 'red ' : 'nocolor ';
-               var getPath = svgPath(projection).geojson;
-               var activeID = context.activeID();
-               var base = context.history().base();
 
-               // The targets and nopes will be MultiLineString sub-segments of the ways
-               var data = { targets: [], nopes: [] };
+         function commonParents() {
+           var graph = context.graph();
+           var commonParents = [];
 
-               entities.forEach(function(way) {
-                   var features = svgSegmentWay(way, graph, activeID);
-                   data.targets.push.apply(data.targets, features.passive);
-                   data.nopes.push.apply(data.nopes, features.active);
-               });
+           for (var i = 0; i < selectedIDs.length; i++) {
+             var entity = context.hasEntity(selectedIDs[i]);
 
+             if (!entity || entity.geometry(graph) !== 'vertex') {
+               return []; // selection includes some not vertices
+             }
 
-               // Targets allow hover and vertex snapping
-               var targetData = data.targets.filter(getPath);
-               var targets = selection.selectAll('.area.target-allowed')
-                   .filter(function(d) { return filter(d.properties.entity); })
-                   .data(targetData, function key(d) { return d.id; });
+             var currParents = graph.parentWays(entity).map(function (w) {
+               return w.id;
+             });
 
-               // exit
-               targets.exit()
-                   .remove();
+             if (!commonParents.length) {
+               commonParents = currParents;
+               continue;
+             }
 
-               var segmentWasEdited = function(d) {
-                   var wayID = d.properties.entity.id;
-                   // if the whole line was edited, don't draw segment changes
-                   if (!base.entities[wayID] ||
-                       !fastDeepEqual(graph.entities[wayID].nodes, base.entities[wayID].nodes)) {
-                       return false;
-                   }
-                   return d.properties.nodes.some(function(n) {
-                       return !base.entities[n.id] ||
-                              !fastDeepEqual(graph.entities[n.id].loc, base.entities[n.id].loc);
-                   });
-               };
+             commonParents = utilArrayIntersection(commonParents, currParents);
 
-               // enter/update
-               targets.enter()
-                   .append('path')
-                   .merge(targets)
-                   .attr('d', getPath)
-                   .attr('class', function(d) { return 'way area target target-allowed ' + targetClass + d.id; })
-                   .classed('segment-edited', segmentWasEdited);
-
-
-               // NOPE
-               var nopeData = data.nopes.filter(getPath);
-               var nopes = selection.selectAll('.area.target-nope')
-                   .filter(function(d) { return filter(d.properties.entity); })
-                   .data(nopeData, function key(d) { return d.id; });
-
-               // exit
-               nopes.exit()
-                   .remove();
-
-               // enter/update
-               nopes.enter()
-                   .append('path')
-                   .merge(nopes)
-                   .attr('d', getPath)
-                   .attr('class', function(d) { return 'way area target target-nope ' + nopeClass + d.id; })
-                   .classed('segment-edited', segmentWasEdited);
-           }
-
-
-           function drawAreas(selection, graph, entities, filter) {
-               var path = svgPath(projection, graph, true);
-               var areas = {};
-               var multipolygon;
-               var base = context.history().base();
-
-               for (var i = 0; i < entities.length; i++) {
-                   var entity = entities[i];
-                   if (entity.geometry(graph) !== 'area') continue;
-
-                   multipolygon = osmIsOldMultipolygonOuterMember(entity, graph);
-                   if (multipolygon) {
-                       areas[multipolygon.id] = {
-                           entity: multipolygon.mergeTags(entity.tags),
-                           area: Math.abs(entity.area(graph))
-                       };
-                   } else if (!areas[entity.id]) {
-                       areas[entity.id] = {
-                           entity: entity,
-                           area: Math.abs(entity.area(graph))
-                       };
-                   }
-               }
+             if (!commonParents.length) {
+               return [];
+             }
+           }
 
-               var fills = Object.values(areas).filter(function hasPath(a) { return path(a.entity); });
-               fills.sort(function areaSort(a, b) { return b.area - a.area; });
-               fills = fills.map(function(a) { return a.entity; });
+           return commonParents;
+         }
 
-               var strokes = fills.filter(function(area) { return area.type === 'way'; });
+         function singularParent() {
+           var parents = commonParents();
 
-               var data = {
-                   clip: fills,
-                   shadow: strokes,
-                   stroke: strokes,
-                   fill: fills
-               };
+           if (!parents || parents.length === 0) {
+             _relatedParent = null;
+             return null;
+           } // relatedParent is used when we visit a vertex with multiple
+           // parents, and we want to remember which parent line we started on.
 
-               var clipPaths = context.surface().selectAll('defs').selectAll('.clipPath-osm')
-                  .filter(filter)
-                  .data(data.clip, osmEntity.key);
 
-               clipPaths.exit()
-                  .remove();
+           if (parents.length === 1) {
+             _relatedParent = parents[0]; // remember this parent for later
+
+             return _relatedParent;
+           }
+
+           if (parents.indexOf(_relatedParent) !== -1) {
+             return _relatedParent; // prefer the previously seen parent
+           }
 
-               var clipPathsEnter = clipPaths.enter()
-                  .append('clipPath')
-                  .attr('class', 'clipPath-osm')
-                  .attr('id', function(entity) { return 'ideditor-' + entity.id + '-clippath'; });
+           return parents[0];
+         }
 
-               clipPathsEnter
-                  .append('path');
+         mode.selectedIDs = function (val) {
+           if (!arguments.length) return selectedIDs;
+           selectedIDs = val;
+           return mode;
+         };
 
-               clipPaths.merge(clipPathsEnter)
-                  .selectAll('path')
-                  .attr('d', path);
+         mode.zoomToSelected = function () {
+           context.map().zoomToEase(selectedEntities());
+         };
 
+         mode.newFeature = function (val) {
+           if (!arguments.length) return _newFeature;
+           _newFeature = val;
+           return mode;
+         };
 
-               var drawLayer = selection.selectAll('.layer-osm.areas');
-               var touchLayer = selection.selectAll('.layer-touch.areas');
+         mode.selectBehavior = function (val) {
+           if (!arguments.length) return _selectBehavior;
+           _selectBehavior = val;
+           return mode;
+         };
 
-               // Draw areas..
-               var areagroup = drawLayer
-                   .selectAll('g.areagroup')
-                   .data(['fill', 'shadow', 'stroke']);
+         mode.follow = function (val) {
+           if (!arguments.length) return _follow;
+           _follow = val;
+           return mode;
+         };
 
-               areagroup = areagroup.enter()
-                   .append('g')
-                   .attr('class', function(d) { return 'areagroup area-' + d; })
-                   .merge(areagroup);
+         function loadOperations() {
+           _operations.forEach(function (operation) {
+             if (operation.behavior) {
+               context.uninstall(operation.behavior);
+             }
+           });
 
-               var paths = areagroup
-                   .selectAll('path')
-                   .filter(filter)
-                   .data(function(layer) { return data[layer]; }, osmEntity.key);
+           _operations = Object.values(Operations).map(function (o) {
+             return o(context, selectedIDs);
+           }).filter(function (o) {
+             return o.id !== 'delete' && o.id !== 'downgrade' && o.id !== 'copy';
+           }).concat([// group copy/downgrade/delete operation together at the end of the list
+           operationCopy(context, selectedIDs), operationDowngrade(context, selectedIDs), operationDelete(context, selectedIDs)]).filter(function (operation) {
+             return operation.available();
+           });
 
-               paths.exit()
-                   .remove();
+           _operations.forEach(function (operation) {
+             if (operation.behavior) {
+               context.install(operation.behavior);
+             }
+           }); // remove any displayed menu
 
 
-               var fillpaths = selection.selectAll('.area-fill path.area').nodes();
-               var bisect = d3_bisector(function(node) { return -node.__data__.area(graph); }).left;
+           context.ui().closeEditMenu();
+         }
 
-               function sortedByArea(entity) {
-                   if (this._parent.__data__ === 'fill') {
-                       return fillpaths[bisect(fillpaths, -entity.area(graph))];
-                   }
-               }
+         mode.operations = function () {
+           return _operations;
+         };
 
-               paths = paths.enter()
-                   .insert('path', sortedByArea)
-                   .merge(paths)
-                   .each(function(entity) {
-                       var layer = this.parentNode.__data__;
-                       this.setAttribute('class', entity.type + ' area ' + layer + ' ' + entity.id);
+         mode.enter = function () {
+           if (!checkSelectedIDs()) return;
+           context.features().forceVisible(selectedIDs);
 
-                       if (layer === 'fill') {
-                           this.setAttribute('clip-path', 'url(#ideditor-' + entity.id + '-clippath)');
-                           this.style.fill = this.style.stroke = getPatternStyle(entity.tags);
-                       }
-                   })
-                   .classed('added', function(d) {
-                       return !base.entities[d.id];
-                   })
-                   .classed('geometry-edited', function(d) {
-                       return graph.entities[d.id] &&
-                           base.entities[d.id] &&
-                           !fastDeepEqual(graph.entities[d.id].nodes, base.entities[d.id].nodes);
-                   })
-                   .classed('retagged', function(d) {
-                       return graph.entities[d.id] &&
-                           base.entities[d.id] &&
-                           !fastDeepEqual(graph.entities[d.id].tags, base.entities[d.id].tags);
-                   })
-                   .call(svgTagClasses())
-                   .attr('d', path);
+           _modeDragNode.restoreSelectedIDs(selectedIDs);
 
+           loadOperations();
 
-               // Draw touch targets..
-               touchLayer
-                   .call(drawTargets, graph, data.stroke, filter);
+           if (!_behaviors.length) {
+             if (!_selectBehavior) _selectBehavior = behaviorSelect(context);
+             _behaviors = [behaviorPaste(context), _breatheBehavior, behaviorHover(context).on('hover', context.ui().sidebar.hoverModeSelect), _selectBehavior, behaviorLasso(context), _modeDragNode.behavior, modeDragNote(context).behavior];
            }
 
-           return drawAreas;
-       }
+           _behaviors.forEach(context.install);
 
-       //[4]           NameStartChar      ::=          ":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6] | [#xD8-#xF6] | [#xF8-#x2FF] | [#x370-#x37D] | [#x37F-#x1FFF] | [#x200C-#x200D] | [#x2070-#x218F] | [#x2C00-#x2FEF] | [#x3001-#xD7FF] | [#xF900-#xFDCF] | [#xFDF0-#xFFFD] | [#x10000-#xEFFFF]
-       //[4a]          NameChar           ::=          NameStartChar | "-" | "." | [0-9] | #xB7 | [#x0300-#x036F] | [#x203F-#x2040]
-       //[5]           Name       ::=          NameStartChar (NameChar)*
-       var nameStartChar = /[A-Z_a-z\xC0-\xD6\xD8-\xF6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD]/;//\u10000-\uEFFFF
-       var nameChar = new RegExp("[\\-\\.0-9"+nameStartChar.source.slice(1,-1)+"\\u00B7\\u0300-\\u036F\\u203F-\\u2040]");
-       var tagNamePattern = new RegExp('^'+nameStartChar.source+nameChar.source+'*(?:\:'+nameStartChar.source+nameChar.source+'*)?$');
-       //var tagNamePattern = /^[a-zA-Z_][\w\-\.]*(?:\:[a-zA-Z_][\w\-\.]*)?$/
-       //var handlers = 'resolveEntity,getExternalSubset,characters,endDocument,endElement,endPrefixMapping,ignorableWhitespace,processingInstruction,setDocumentLocator,skippedEntity,startDocument,startElement,startPrefixMapping,notationDecl,unparsedEntityDecl,error,fatalError,warning,attributeDecl,elementDecl,externalEntityDecl,internalEntityDecl,comment,endCDATA,endDTD,endEntity,startCDATA,startDTD,startEntity'.split(',')
+           keybinding.on(_t('inspector.zoom_to.key'), mode.zoomToSelected).on(['[', 'pgup'], previousVertex).on([']', 'pgdown'], nextVertex).on(['{', uiCmd('⌘['), 'home'], firstVertex).on(['}', uiCmd('⌘]'), 'end'], lastVertex).on(uiCmd('⇧←'), nudgeSelection([-10, 0])).on(uiCmd('⇧↑'), nudgeSelection([0, -10])).on(uiCmd('⇧→'), nudgeSelection([10, 0])).on(uiCmd('⇧↓'), nudgeSelection([0, 10])).on(uiCmd('⇧⌥←'), nudgeSelection([-100, 0])).on(uiCmd('⇧⌥↑'), nudgeSelection([0, -100])).on(uiCmd('⇧⌥→'), nudgeSelection([100, 0])).on(uiCmd('⇧⌥↓'), nudgeSelection([0, 100])).on(utilKeybinding.plusKeys.map(function (key) {
+             return uiCmd('⇧' + key);
+           }), scaleSelection(1.05)).on(utilKeybinding.plusKeys.map(function (key) {
+             return uiCmd('⇧⌥' + key);
+           }), scaleSelection(Math.pow(1.05, 5))).on(utilKeybinding.minusKeys.map(function (key) {
+             return uiCmd('⇧' + key);
+           }), scaleSelection(1 / 1.05)).on(utilKeybinding.minusKeys.map(function (key) {
+             return uiCmd('⇧⌥' + key);
+           }), scaleSelection(1 / Math.pow(1.05, 5))).on(['\\', 'pause'], nextParent).on('⎋', esc, true);
+           select(document).call(keybinding);
+           context.ui().sidebar.select(selectedIDs, _newFeature);
+           context.history().on('change.select', function () {
+             loadOperations(); // reselect after change in case relation members were removed or added
 
-       //S_TAG,        S_ATTR, S_EQ,   S_ATTR_NOQUOT_VALUE
-       //S_ATTR_SPACE, S_ATTR_END,     S_TAG_SPACE, S_TAG_CLOSE
-       var S_TAG = 0;//tag name offerring
-       var S_ATTR = 1;//attr name offerring 
-       var S_ATTR_SPACE=2;//attr name end and space offer
-       var S_EQ = 3;//=space?
-       var S_ATTR_NOQUOT_VALUE = 4;//attr value(no quot value only)
-       var S_ATTR_END = 5;//attr value end and no space(quot end)
-       var S_TAG_SPACE = 6;//(attr value end || tag end ) && (space offer)
-       var S_TAG_CLOSE = 7;//closed el<el />
+             selectElements();
+           }).on('undone.select', checkSelectedIDs).on('redone.select', checkSelectedIDs);
+           context.map().on('drawn.select', selectElements).on('crossEditableZoom.select', function () {
+             selectElements();
 
-       function XMLReader(){
-               
-       }
+             _breatheBehavior.restartIfNeeded(context.surface());
+           });
+           context.map().doubleUpHandler().on('doubleUp.modeSelect', didDoubleUp);
+           selectElements();
 
-       XMLReader.prototype = {
-               parse:function(source,defaultNSMap,entityMap){
-                       var domBuilder = this.domBuilder;
-                       domBuilder.startDocument();
-                       _copy(defaultNSMap ,defaultNSMap = {});
-                       parse(source,defaultNSMap,entityMap,
-                                       domBuilder,this.errorHandler);
-                       domBuilder.endDocument();
-               }
-       };
-       function parse(source,defaultNSMapCopy,entityMap,domBuilder,errorHandler){
-               function fixedFromCharCode(code) {
-                       // String.prototype.fromCharCode does not supports
-                       // > 2 bytes unicode chars directly
-                       if (code > 0xffff) {
-                               code -= 0x10000;
-                               var surrogate1 = 0xd800 + (code >> 10)
-                                       , surrogate2 = 0xdc00 + (code & 0x3ff);
-
-                               return String.fromCharCode(surrogate1, surrogate2);
-                       } else {
-                               return String.fromCharCode(code);
-                       }
-               }
-               function entityReplacer(a){
-                       var k = a.slice(1,-1);
-                       if(k in entityMap){
-                               return entityMap[k]; 
-                       }else if(k.charAt(0) === '#'){
-                               return fixedFromCharCode(parseInt(k.substr(1).replace('x','0x')))
-                       }else {
-                               errorHandler.error('entity not found:'+a);
-                               return a;
-                       }
-               }
-               function appendText(end){//has some bugs
-                       if(end>start){
-                               var xt = source.substring(start,end).replace(/&#?\w+;/g,entityReplacer);
-                               locator&&position(start);
-                               domBuilder.characters(xt,0,end-start);
-                               start = end;
-                       }
-               }
-               function position(p,m){
-                       while(p>=lineEnd && (m = linePattern.exec(source))){
-                               lineStart = m.index;
-                               lineEnd = lineStart + m[0].length;
-                               locator.lineNumber++;
-                               //console.log('line++:',locator,startPos,endPos)
-                       }
-                       locator.columnNumber = p-lineStart+1;
-               }
-               var lineStart = 0;
-               var lineEnd = 0;
-               var linePattern = /.*(?:\r\n?|\n)|.*$/g;
-               var locator = domBuilder.locator;
-               
-               var parseStack = [{currentNSMap:defaultNSMapCopy}];
-               var closeMap = {};
-               var start = 0;
-               while(true){
-                       try{
-                               var tagStart = source.indexOf('<',start);
-                               if(tagStart<0){
-                                       if(!source.substr(start).match(/^\s*$/)){
-                                               var doc = domBuilder.doc;
-                                       var text = doc.createTextNode(source.substr(start));
-                                       doc.appendChild(text);
-                                       domBuilder.currentElement = text;
-                                       }
-                                       return;
-                               }
-                               if(tagStart>start){
-                                       appendText(tagStart);
-                               }
-                               switch(source.charAt(tagStart+1)){
-                               case '/':
-                                       var end = source.indexOf('>',tagStart+3);
-                                       var tagName = source.substring(tagStart+2,end);
-                                       var config = parseStack.pop();
-                                       if(end<0){
-                                               
-                                       tagName = source.substring(tagStart+2).replace(/[\s<].*/,'');
-                                       //console.error('#@@@@@@'+tagName)
-                                       errorHandler.error("end tag name: "+tagName+' is not complete:'+config.tagName);
-                                       end = tagStart+1+tagName.length;
-                               }else if(tagName.match(/\s</)){
-                                       tagName = tagName.replace(/[\s<].*/,'');
-                                       errorHandler.error("end tag name: "+tagName+' maybe not complete');
-                                       end = tagStart+1+tagName.length;
-                                       }
-                                       //console.error(parseStack.length,parseStack)
-                                       //console.error(config);
-                                       var localNSMap = config.localNSMap;
-                                       var endMatch = config.tagName == tagName;
-                                       var endIgnoreCaseMach = endMatch || config.tagName&&config.tagName.toLowerCase() == tagName.toLowerCase();
-                               if(endIgnoreCaseMach){
-                                       domBuilder.endElement(config.uri,config.localName,tagName);
-                                               if(localNSMap){
-                                                       for(var prefix in localNSMap){
-                                                               domBuilder.endPrefixMapping(prefix) ;
-                                                       }
-                                               }
-                                               if(!endMatch){
-                                       errorHandler.fatalError("end tag name: "+tagName+' is not match the current start tagName:'+config.tagName );
-                                               }
-                               }else {
-                                       parseStack.push(config);
-                               }
-                                       
-                                       end++;
-                                       break;
-                                       // end elment
-                               case '?':// <?...?>
-                                       locator&&position(tagStart);
-                                       end = parseInstruction(source,tagStart,domBuilder);
-                                       break;
-                               case '!':// <!doctype,<![CDATA,<!--
-                                       locator&&position(tagStart);
-                                       end = parseDCC(source,tagStart,domBuilder,errorHandler);
-                                       break;
-                               default:
-                                       locator&&position(tagStart);
-                                       var el = new ElementAttributes();
-                                       var currentNSMap = parseStack[parseStack.length-1].currentNSMap;
-                                       //elStartEnd
-                                       var end = parseElementStartPart(source,tagStart,el,currentNSMap,entityReplacer,errorHandler);
-                                       var len = el.length;
-                                       
-                                       
-                                       if(!el.closed && fixSelfClosed(source,end,el.tagName,closeMap)){
-                                               el.closed = true;
-                                               if(!entityMap.nbsp){
-                                                       errorHandler.warning('unclosed xml attribute');
-                                               }
-                                       }
-                                       if(locator && len){
-                                               var locator2 = copyLocator(locator,{});
-                                               //try{//attribute position fixed
-                                               for(var i = 0;i<len;i++){
-                                                       var a = el[i];
-                                                       position(a.offset);
-                                                       a.locator = copyLocator(locator,{});
-                                               }
-                                               //}catch(e){console.error('@@@@@'+e)}
-                                               domBuilder.locator = locator2;
-                                               if(appendElement(el,domBuilder,currentNSMap)){
-                                                       parseStack.push(el);
-                                               }
-                                               domBuilder.locator = locator;
-                                       }else {
-                                               if(appendElement(el,domBuilder,currentNSMap)){
-                                                       parseStack.push(el);
-                                               }
-                                       }
-                                       
-                                       
-                                       
-                                       if(el.uri === 'http://www.w3.org/1999/xhtml' && !el.closed){
-                                               end = parseHtmlSpecialContent(source,end,el.tagName,entityReplacer,domBuilder);
-                                       }else {
-                                               end++;
-                                       }
-                               }
-                       }catch(e){
-                               errorHandler.error('element parse error: '+e);
-                               //errorHandler.error('element parse error: '+e);
-                               end = -1;
-                               //throw e;
-                       }
-                       if(end>start){
-                               start = end;
-                       }else {
-                               //TODO: 这里有可能sax回退,有位置错误风险
-                               appendText(Math.max(tagStart,start)+1);
-                       }
-               }
-       }
-       function copyLocator(f,t){
-               t.lineNumber = f.lineNumber;
-               t.columnNumber = f.columnNumber;
-               return t;
-       }
+           if (_follow) {
+             var extent = geoExtent();
+             var graph = context.graph();
+             selectedIDs.forEach(function (id) {
+               var entity = context.entity(id);
 
-       /**
-        * @see #appendElement(source,elStartEnd,el,selfClosed,entityReplacer,domBuilder,parseStack);
-        * @return end of the elementStartPart(end of elementEndPart for selfClosed el)
-        */
-       function parseElementStartPart(source,start,el,currentNSMap,entityReplacer,errorHandler){
-               var attrName;
-               var value;
-               var p = ++start;
-               var s = S_TAG;//status
-               while(true){
-                       var c = source.charAt(p);
-                       switch(c){
-                       case '=':
-                               if(s === S_ATTR){//attrName
-                                       attrName = source.slice(start,p);
-                                       s = S_EQ;
-                               }else if(s === S_ATTR_SPACE){
-                                       s = S_EQ;
-                               }else {
-                                       //fatalError: equal must after attrName or space after attrName
-                                       throw new Error('attribute equal must after attrName');
-                               }
-                               break;
-                       case '\'':
-                       case '"':
-                               if(s === S_EQ || s === S_ATTR //|| s == S_ATTR_SPACE
-                                       ){//equal
-                                       if(s === S_ATTR){
-                                               errorHandler.warning('attribute value must after "="');
-                                               attrName = source.slice(start,p);
-                                       }
-                                       start = p+1;
-                                       p = source.indexOf(c,start);
-                                       if(p>0){
-                                               value = source.slice(start,p).replace(/&#?\w+;/g,entityReplacer);
-                                               el.add(attrName,value,start-1);
-                                               s = S_ATTR_END;
-                                       }else {
-                                               //fatalError: no end quot match
-                                               throw new Error('attribute value no end \''+c+'\' match');
-                                       }
-                               }else if(s == S_ATTR_NOQUOT_VALUE){
-                                       value = source.slice(start,p).replace(/&#?\w+;/g,entityReplacer);
-                                       //console.log(attrName,value,start,p)
-                                       el.add(attrName,value,start);
-                                       //console.dir(el)
-                                       errorHandler.warning('attribute "'+attrName+'" missed start quot('+c+')!!');
-                                       start = p+1;
-                                       s = S_ATTR_END;
-                               }else {
-                                       //fatalError: no equal before
-                                       throw new Error('attribute value must after "="');
-                               }
-                               break;
-                       case '/':
-                               switch(s){
-                               case S_TAG:
-                                       el.setTagName(source.slice(start,p));
-                               case S_ATTR_END:
-                               case S_TAG_SPACE:
-                               case S_TAG_CLOSE:
-                                       s =S_TAG_CLOSE;
-                                       el.closed = true;
-                               case S_ATTR_NOQUOT_VALUE:
-                               case S_ATTR:
-                               case S_ATTR_SPACE:
-                                       break;
-                               //case S_EQ:
-                               default:
-                                       throw new Error("attribute invalid close char('/')")
-                               }
-                               break;
-                       case ''://end document
-                               //throw new Error('unexpected end of input')
-                               errorHandler.error('unexpected end of input');
-                               if(s == S_TAG){
-                                       el.setTagName(source.slice(start,p));
-                               }
-                               return p;
-                       case '>':
-                               switch(s){
-                               case S_TAG:
-                                       el.setTagName(source.slice(start,p));
-                               case S_ATTR_END:
-                               case S_TAG_SPACE:
-                               case S_TAG_CLOSE:
-                                       break;//normal
-                               case S_ATTR_NOQUOT_VALUE://Compatible state
-                               case S_ATTR:
-                                       value = source.slice(start,p);
-                                       if(value.slice(-1) === '/'){
-                                               el.closed  = true;
-                                               value = value.slice(0,-1);
-                                       }
-                               case S_ATTR_SPACE:
-                                       if(s === S_ATTR_SPACE){
-                                               value = attrName;
-                                       }
-                                       if(s == S_ATTR_NOQUOT_VALUE){
-                                               errorHandler.warning('attribute "'+value+'" missed quot(")!!');
-                                               el.add(attrName,value.replace(/&#?\w+;/g,entityReplacer),start);
-                                       }else {
-                                               if(currentNSMap[''] !== 'http://www.w3.org/1999/xhtml' || !value.match(/^(?:disabled|checked|selected)$/i)){
-                                                       errorHandler.warning('attribute "'+value+'" missed value!! "'+value+'" instead!!');
-                                               }
-                                               el.add(value,value,start);
-                                       }
-                                       break;
-                               case S_EQ:
-                                       throw new Error('attribute value missed!!');
-                               }
-       //                      console.log(tagName,tagNamePattern,tagNamePattern.test(tagName))
-                               return p;
-                       /*xml space '\x20' | #x9 | #xD | #xA; */
-                       case '\u0080':
-                               c = ' ';
-                       default:
-                               if(c<= ' '){//space
-                                       switch(s){
-                                       case S_TAG:
-                                               el.setTagName(source.slice(start,p));//tagName
-                                               s = S_TAG_SPACE;
-                                               break;
-                                       case S_ATTR:
-                                               attrName = source.slice(start,p);
-                                               s = S_ATTR_SPACE;
-                                               break;
-                                       case S_ATTR_NOQUOT_VALUE:
-                                               var value = source.slice(start,p).replace(/&#?\w+;/g,entityReplacer);
-                                               errorHandler.warning('attribute "'+value+'" missed quot(")!!');
-                                               el.add(attrName,value,start);
-                                       case S_ATTR_END:
-                                               s = S_TAG_SPACE;
-                                               break;
-                                       //case S_TAG_SPACE:
-                                       //case S_EQ:
-                                       //case S_ATTR_SPACE:
-                                       //      void();break;
-                                       //case S_TAG_CLOSE:
-                                               //ignore warning
-                                       }
-                               }else {//not space
-       //S_TAG,        S_ATTR, S_EQ,   S_ATTR_NOQUOT_VALUE
-       //S_ATTR_SPACE, S_ATTR_END,     S_TAG_SPACE, S_TAG_CLOSE
-                                       switch(s){
-                                       //case S_TAG:void();break;
-                                       //case S_ATTR:void();break;
-                                       //case S_ATTR_NOQUOT_VALUE:void();break;
-                                       case S_ATTR_SPACE:
-                                               var tagName =  el.tagName;
-                                               if(currentNSMap[''] !== 'http://www.w3.org/1999/xhtml' || !attrName.match(/^(?:disabled|checked|selected)$/i)){
-                                                       errorHandler.warning('attribute "'+attrName+'" missed value!! "'+attrName+'" instead2!!');
-                                               }
-                                               el.add(attrName,attrName,start);
-                                               start = p;
-                                               s = S_ATTR;
-                                               break;
-                                       case S_ATTR_END:
-                                               errorHandler.warning('attribute space is required"'+attrName+'"!!');
-                                       case S_TAG_SPACE:
-                                               s = S_ATTR;
-                                               start = p;
-                                               break;
-                                       case S_EQ:
-                                               s = S_ATTR_NOQUOT_VALUE;
-                                               start = p;
-                                               break;
-                                       case S_TAG_CLOSE:
-                                               throw new Error("elements closed character '/' and '>' must be connected to");
-                                       }
-                               }
-                       }//end outer switch
-                       //console.log('p++',p)
-                       p++;
-               }
-       }
-       /**
-        * @return true if has new namespace define
-        */
-       function appendElement(el,domBuilder,currentNSMap){
-               var tagName = el.tagName;
-               var localNSMap = null;
-               //var currentNSMap = parseStack[parseStack.length-1].currentNSMap;
-               var i = el.length;
-               while(i--){
-                       var a = el[i];
-                       var qName = a.qName;
-                       var value = a.value;
-                       var nsp = qName.indexOf(':');
-                       if(nsp>0){
-                               var prefix = a.prefix = qName.slice(0,nsp);
-                               var localName = qName.slice(nsp+1);
-                               var nsPrefix = prefix === 'xmlns' && localName;
-                       }else {
-                               localName = qName;
-                               prefix = null;
-                               nsPrefix = qName === 'xmlns' && '';
-                       }
-                       //can not set prefix,because prefix !== ''
-                       a.localName = localName ;
-                       //prefix == null for no ns prefix attribute 
-                       if(nsPrefix !== false){//hack!!
-                               if(localNSMap == null){
-                                       localNSMap = {};
-                                       //console.log(currentNSMap,0)
-                                       _copy(currentNSMap,currentNSMap={});
-                                       //console.log(currentNSMap,1)
-                               }
-                               currentNSMap[nsPrefix] = localNSMap[nsPrefix] = value;
-                               a.uri = 'http://www.w3.org/2000/xmlns/';
-                               domBuilder.startPrefixMapping(nsPrefix, value); 
-                       }
-               }
-               var i = el.length;
-               while(i--){
-                       a = el[i];
-                       var prefix = a.prefix;
-                       if(prefix){//no prefix attribute has no namespace
-                               if(prefix === 'xml'){
-                                       a.uri = 'http://www.w3.org/XML/1998/namespace';
-                               }if(prefix !== 'xmlns'){
-                                       a.uri = currentNSMap[prefix || ''];
-                                       
-                                       //{console.log('###'+a.qName,domBuilder.locator.systemId+'',currentNSMap,a.uri)}
-                               }
-                       }
-               }
-               var nsp = tagName.indexOf(':');
-               if(nsp>0){
-                       prefix = el.prefix = tagName.slice(0,nsp);
-                       localName = el.localName = tagName.slice(nsp+1);
-               }else {
-                       prefix = null;//important!!
-                       localName = el.localName = tagName;
-               }
-               //no prefix element has default namespace
-               var ns = el.uri = currentNSMap[prefix || ''];
-               domBuilder.startElement(ns,localName,tagName,el);
-               //endPrefixMapping and startPrefixMapping have not any help for dom builder
-               //localNSMap = null
-               if(el.closed){
-                       domBuilder.endElement(ns,localName,tagName);
-                       if(localNSMap){
-                               for(prefix in localNSMap){
-                                       domBuilder.endPrefixMapping(prefix); 
-                               }
-                       }
-               }else {
-                       el.currentNSMap = currentNSMap;
-                       el.localNSMap = localNSMap;
-                       //parseStack.push(el);
-                       return true;
-               }
-       }
-       function parseHtmlSpecialContent(source,elStartEnd,tagName,entityReplacer,domBuilder){
-               if(/^(?:script|textarea)$/i.test(tagName)){
-                       var elEndStart =  source.indexOf('</'+tagName+'>',elStartEnd);
-                       var text = source.substring(elStartEnd+1,elEndStart);
-                       if(/[&<]/.test(text)){
-                               if(/^script$/i.test(tagName)){
-                                       //if(!/\]\]>/.test(text)){
-                                               //lexHandler.startCDATA();
-                                               domBuilder.characters(text,0,text.length);
-                                               //lexHandler.endCDATA();
-                                               return elEndStart;
-                                       //}
-                               }//}else{//text area
-                                       text = text.replace(/&#?\w+;/g,entityReplacer);
-                                       domBuilder.characters(text,0,text.length);
-                                       return elEndStart;
-                               //}
-                               
-                       }
-               }
-               return elStartEnd+1;
-       }
-       function fixSelfClosed(source,elStartEnd,tagName,closeMap){
-               //if(tagName in closeMap){
-               var pos = closeMap[tagName];
-               if(pos == null){
-                       //console.log(tagName)
-                       pos =  source.lastIndexOf('</'+tagName+'>');
-                       if(pos<elStartEnd){//忘记闭合
-                               pos = source.lastIndexOf('</'+tagName);
-                       }
-                       closeMap[tagName] =pos;
-               }
-               return pos<elStartEnd;
-               //} 
-       }
-       function _copy(source,target){
-               for(var n in source){target[n] = source[n];}
-       }
-       function parseDCC(source,start,domBuilder,errorHandler){//sure start with '<!'
-               var next= source.charAt(start+2);
-               switch(next){
-               case '-':
-                       if(source.charAt(start + 3) === '-'){
-                               var end = source.indexOf('-->',start+4);
-                               //append comment source.substring(4,end)//<!--
-                               if(end>start){
-                                       domBuilder.comment(source,start+4,end-start-4);
-                                       return end+3;
-                               }else {
-                                       errorHandler.error("Unclosed comment");
-                                       return -1;
-                               }
-                       }else {
-                               //error
-                               return -1;
-                       }
-               default:
-                       if(source.substr(start+3,6) == 'CDATA['){
-                               var end = source.indexOf(']]>',start+9);
-                               domBuilder.startCDATA();
-                               domBuilder.characters(source,start+9,end-start-9);
-                               domBuilder.endCDATA(); 
-                               return end+3;
-                       }
-                       //<!DOCTYPE
-                       //startDTD(java.lang.String name, java.lang.String publicId, java.lang.String systemId) 
-                       var matchs = split(source,start);
-                       var len = matchs.length;
-                       if(len>1 && /!doctype/i.test(matchs[0][0])){
-                               var name = matchs[1][0];
-                               var pubid = len>3 && /^public$/i.test(matchs[2][0]) && matchs[3][0];
-                               var sysid = len>4 && matchs[4][0];
-                               var lastMatch = matchs[len-1];
-                               domBuilder.startDTD(name,pubid && pubid.replace(/^(['"])(.*?)\1$/,'$2'),
-                                               sysid && sysid.replace(/^(['"])(.*?)\1$/,'$2'));
-                               domBuilder.endDTD();
-                               
-                               return lastMatch.index+lastMatch[0].length
-                       }
-               }
-               return -1;
-       }
+               extent._extend(entity.extent(graph));
+             });
+             var loc = extent.center();
+             context.map().centerEase(loc); // we could enter the mode multiple times, so reset follow for next time
 
+             _follow = false;
+           }
 
+           function nudgeSelection(delta) {
+             return function () {
+               // prevent nudging during low zoom selection
+               if (!context.map().withinEditableZoom()) return;
+               var moveOp = operationMove(context, selectedIDs);
 
-       function parseInstruction(source,start,domBuilder){
-               var end = source.indexOf('?>',start);
-               if(end){
-                       var match = source.substring(start,end).match(/^<\?(\S*)\s*([\s\S]*?)\s*$/);
-                       if(match){
-                               var len = match[0].length;
-                               domBuilder.processingInstruction(match[1], match[2]) ;
-                               return end+2;
-                       }else {//error
-                               return -1;
-                       }
-               }
-               return -1;
-       }
+               if (moveOp.disabled()) {
+                 context.ui().flash.duration(4000).iconName('#iD-operation-' + moveOp.id).iconClass('operation disabled').label(moveOp.tooltip)();
+               } else {
+                 context.perform(actionMove(selectedIDs, delta, context.projection), moveOp.annotation());
+                 context.validator().validate();
+               }
+             };
+           }
 
-       /**
-        * @param source
-        */
-       function ElementAttributes(source){
-               
-       }
-       ElementAttributes.prototype = {
-               setTagName:function(tagName){
-                       if(!tagNamePattern.test(tagName)){
-                               throw new Error('invalid tagName:'+tagName)
-                       }
-                       this.tagName = tagName;
-               },
-               add:function(qName,value,offset){
-                       if(!tagNamePattern.test(qName)){
-                               throw new Error('invalid attribute:'+qName)
-                       }
-                       this[this.length++] = {qName:qName,value:value,offset:offset};
-               },
-               length:0,
-               getLocalName:function(i){return this[i].localName},
-               getLocator:function(i){return this[i].locator},
-               getQName:function(i){return this[i].qName},
-               getURI:function(i){return this[i].uri},
-               getValue:function(i){return this[i].value}
-       //      ,getIndex:function(uri, localName)){
-       //              if(localName){
-       //                      
-       //              }else{
-       //                      var qName = uri
-       //              }
-       //      },
-       //      getValue:function(){return this.getValue(this.getIndex.apply(this,arguments))},
-       //      getType:function(uri,localName){}
-       //      getType:function(i){},
-       };
+           function scaleSelection(factor) {
+             return function () {
+               // prevent scaling during low zoom selection
+               if (!context.map().withinEditableZoom()) return;
+               var nodes = utilGetAllNodes(selectedIDs, context.graph());
+               var isUp = factor > 1; // can only scale if multiple nodes are selected
 
+               if (nodes.length <= 1) return;
+               var extent = utilTotalExtent(selectedIDs, context.graph()); // These disabled checks would normally be handled by an operation
+               // object, but we don't want an actual scale operation at this point.
 
+               function scalingDisabled() {
+                 if (tooSmall()) {
+                   return 'too_small';
+                 } else if (extent.percentContainedIn(context.map().extent()) < 0.8) {
+                   return 'too_large';
+                 } else if (someMissing() || selectedIDs.some(incompleteRelation)) {
+                   return 'not_downloaded';
+                 } else if (selectedIDs.some(context.hasHiddenConnections)) {
+                   return 'connected_to_hidden';
+                 }
 
+                 return false;
 
-       function _set_proto_(thiz,parent){
-               thiz.__proto__ = parent;
-               return thiz;
-       }
-       if(!(_set_proto_({},_set_proto_.prototype) instanceof _set_proto_)){
-               _set_proto_ = function(thiz,parent){
-                       function p(){}          p.prototype = parent;
-                       p = new p();
-                       for(parent in thiz){
-                               p[parent] = thiz[parent];
-                       }
-                       return p;
-               };
-       }
+                 function tooSmall() {
+                   if (isUp) return false;
+                   var dLon = Math.abs(extent[1][0] - extent[0][0]);
+                   var dLat = Math.abs(extent[1][1] - extent[0][1]);
+                   return dLon < geoMetersToLon(1, extent[1][1]) && dLat < geoMetersToLat(1);
+                 }
 
-       function split(source,start){
-               var match;
-               var buf = [];
-               var reg = /'[^']+'|"[^"]+"|[^\s<>\/=]+=?|(\/?\s*>|<)/g;
-               reg.lastIndex = start;
-               reg.exec(source);//skip <
-               while(match = reg.exec(source)){
-                       buf.push(match);
-                       if(match[1])return buf;
-               }
-       }
+                 function someMissing() {
+                   if (context.inIntro()) return false;
+                   var osm = context.connection();
 
-       var XMLReader_1 = XMLReader;
+                   if (osm) {
+                     var missing = nodes.filter(function (n) {
+                       return !osm.isDataLoaded(n.loc);
+                     });
 
-       var sax = {
-               XMLReader: XMLReader_1
-       };
+                     if (missing.length) {
+                       missing.forEach(function (loc) {
+                         context.loadTileAtLoc(loc);
+                       });
+                       return true;
+                     }
+                   }
 
-       /*
-        * DOM Level 2
-        * Object DOMException
-        * @see http://www.w3.org/TR/REC-DOM-Level-1/ecma-script-language-binding.html
-        * @see http://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113/ecma-script-binding.html
-        */
+                   return false;
+                 }
 
-       function copy$2(src,dest){
-               for(var p in src){
-                       dest[p] = src[p];
-               }
-       }
-       /**
-       ^\w+\.prototype\.([_\w]+)\s*=\s*((?:.*\{\s*?[\r\n][\s\S]*?^})|\S.*?(?=[;\r\n]));?
-       ^\w+\.prototype\.([_\w]+)\s*=\s*(\S.*?(?=[;\r\n]));?
-        */
-       function _extends(Class,Super){
-               var pt = Class.prototype;
-               if(Object.create){
-                       var ppt = Object.create(Super.prototype);
-                       pt.__proto__ = ppt;
-               }
-               if(!(pt instanceof Super)){
-                       function t(){}          t.prototype = Super.prototype;
-                       t = new t();
-                       copy$2(pt,t);
-                       Class.prototype = pt = t;
-               }
-               if(pt.constructor != Class){
-                       if(typeof Class != 'function'){
-                               console.error("unknow Class:"+Class);
-                       }
-                       pt.constructor = Class;
-               }
-       }
-       var htmlns = 'http://www.w3.org/1999/xhtml' ;
-       // Node Types
-       var NodeType = {};
-       var ELEMENT_NODE                = NodeType.ELEMENT_NODE                = 1;
-       var ATTRIBUTE_NODE              = NodeType.ATTRIBUTE_NODE              = 2;
-       var TEXT_NODE                   = NodeType.TEXT_NODE                   = 3;
-       var CDATA_SECTION_NODE          = NodeType.CDATA_SECTION_NODE          = 4;
-       var ENTITY_REFERENCE_NODE       = NodeType.ENTITY_REFERENCE_NODE       = 5;
-       var ENTITY_NODE                 = NodeType.ENTITY_NODE                 = 6;
-       var PROCESSING_INSTRUCTION_NODE = NodeType.PROCESSING_INSTRUCTION_NODE = 7;
-       var COMMENT_NODE                = NodeType.COMMENT_NODE                = 8;
-       var DOCUMENT_NODE               = NodeType.DOCUMENT_NODE               = 9;
-       var DOCUMENT_TYPE_NODE          = NodeType.DOCUMENT_TYPE_NODE          = 10;
-       var DOCUMENT_FRAGMENT_NODE      = NodeType.DOCUMENT_FRAGMENT_NODE      = 11;
-       var NOTATION_NODE               = NodeType.NOTATION_NODE               = 12;
+                 function incompleteRelation(id) {
+                   var entity = context.entity(id);
+                   return entity.type === 'relation' && !entity.isComplete(context.graph());
+                 }
+               }
 
-       // ExceptionCode
-       var ExceptionCode = {};
-       var ExceptionMessage = {};
-       var INDEX_SIZE_ERR              = ExceptionCode.INDEX_SIZE_ERR              = ((ExceptionMessage[1]="Index size error"),1);
-       var DOMSTRING_SIZE_ERR          = ExceptionCode.DOMSTRING_SIZE_ERR          = ((ExceptionMessage[2]="DOMString size error"),2);
-       var HIERARCHY_REQUEST_ERR       = ExceptionCode.HIERARCHY_REQUEST_ERR       = ((ExceptionMessage[3]="Hierarchy request error"),3);
-       var WRONG_DOCUMENT_ERR          = ExceptionCode.WRONG_DOCUMENT_ERR          = ((ExceptionMessage[4]="Wrong document"),4);
-       var INVALID_CHARACTER_ERR       = ExceptionCode.INVALID_CHARACTER_ERR       = ((ExceptionMessage[5]="Invalid character"),5);
-       var NO_DATA_ALLOWED_ERR         = ExceptionCode.NO_DATA_ALLOWED_ERR         = ((ExceptionMessage[6]="No data allowed"),6);
-       var NO_MODIFICATION_ALLOWED_ERR = ExceptionCode.NO_MODIFICATION_ALLOWED_ERR = ((ExceptionMessage[7]="No modification allowed"),7);
-       var NOT_FOUND_ERR               = ExceptionCode.NOT_FOUND_ERR               = ((ExceptionMessage[8]="Not found"),8);
-       var NOT_SUPPORTED_ERR           = ExceptionCode.NOT_SUPPORTED_ERR           = ((ExceptionMessage[9]="Not supported"),9);
-       var INUSE_ATTRIBUTE_ERR         = ExceptionCode.INUSE_ATTRIBUTE_ERR         = ((ExceptionMessage[10]="Attribute in use"),10);
-       //level2
-       var INVALID_STATE_ERR           = ExceptionCode.INVALID_STATE_ERR               = ((ExceptionMessage[11]="Invalid state"),11);
-       var SYNTAX_ERR                  = ExceptionCode.SYNTAX_ERR                      = ((ExceptionMessage[12]="Syntax error"),12);
-       var INVALID_MODIFICATION_ERR    = ExceptionCode.INVALID_MODIFICATION_ERR        = ((ExceptionMessage[13]="Invalid modification"),13);
-       var NAMESPACE_ERR               = ExceptionCode.NAMESPACE_ERR                   = ((ExceptionMessage[14]="Invalid namespace"),14);
-       var INVALID_ACCESS_ERR          = ExceptionCode.INVALID_ACCESS_ERR              = ((ExceptionMessage[15]="Invalid access"),15);
+               var disabled = scalingDisabled();
 
+               if (disabled) {
+                 var multi = selectedIDs.length === 1 ? 'single' : 'multiple';
+                 context.ui().flash.duration(4000).iconName('#iD-icon-no').iconClass('operation disabled').label(_t('operations.scale.' + disabled + '.' + multi))();
+               } else {
+                 var pivot = context.projection(extent.center());
+                 var annotation = _t('operations.scale.annotation.' + (isUp ? 'up' : 'down') + '.feature', {
+                   n: selectedIDs.length
+                 });
+                 context.perform(actionScale(selectedIDs, pivot, factor, context.projection), annotation);
+                 context.validator().validate();
+               }
+             };
+           }
 
-       function DOMException$2(code, message) {
-               if(message instanceof Error){
-                       var error = message;
-               }else {
-                       error = this;
-                       Error.call(this, ExceptionMessage[code]);
-                       this.message = ExceptionMessage[code];
-                       if(Error.captureStackTrace) Error.captureStackTrace(this, DOMException$2);
-               }
-               error.code = code;
-               if(message) this.message = this.message + ": " + message;
-               return error;
-       }DOMException$2.prototype = Error.prototype;
-       copy$2(ExceptionCode,DOMException$2);
-       /**
-        * @see http://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113/core.html#ID-536297177
-        * The NodeList interface provides the abstraction of an ordered collection of nodes, without defining or constraining how this collection is implemented. NodeList objects in the DOM are live.
-        * The items in the NodeList are accessible via an integral index, starting from 0.
-        */
-       function NodeList() {
-       }NodeList.prototype = {
-               /**
-                * The number of nodes in the list. The range of valid child node indices is 0 to length-1 inclusive.
-                * @standard level1
-                */
-               length:0, 
-               /**
-                * Returns the indexth item in the collection. If index is greater than or equal to the number of nodes in the list, this returns null.
-                * @standard level1
-                * @param index  unsigned long 
-                *   Index into the collection.
-                * @return Node
-                *      The node at the indexth position in the NodeList, or null if that is not a valid index. 
-                */
-               item: function(index) {
-                       return this[index] || null;
-               },
-               toString:function(isHTML,nodeFilter){
-                       for(var buf = [], i = 0;i<this.length;i++){
-                               serializeToString(this[i],buf,isHTML,nodeFilter);
-                       }
-                       return buf.join('');
-               }
-       };
-       function LiveNodeList(node,refresh){
-               this._node = node;
-               this._refresh = refresh;
-               _updateLiveList(this);
-       }
-       function _updateLiveList(list){
-               var inc = list._node._inc || list._node.ownerDocument._inc;
-               if(list._inc != inc){
-                       var ls = list._refresh(list._node);
-                       //console.log(ls.length)
-                       __set__(list,'length',ls.length);
-                       copy$2(ls,list);
-                       list._inc = inc;
-               }
-       }
-       LiveNodeList.prototype.item = function(i){
-               _updateLiveList(this);
-               return this[i];
-       };
+           function didDoubleUp(d3_event, loc) {
+             if (!context.map().withinEditableZoom()) return;
+             var target = select(d3_event.target);
+             var datum = target.datum();
+             var entity = datum && datum.properties && datum.properties.entity;
+             if (!entity) return;
 
-       _extends(LiveNodeList,NodeList);
-       /**
-        * 
-        * Objects implementing the NamedNodeMap interface are used to represent collections of nodes that can be accessed by name. Note that NamedNodeMap does not inherit from NodeList; NamedNodeMaps are not maintained in any particular order. Objects contained in an object implementing NamedNodeMap may also be accessed by an ordinal index, but this is simply to allow convenient enumeration of the contents of a NamedNodeMap, and does not imply that the DOM specifies an order to these Nodes.
-        * NamedNodeMap objects in the DOM are live.
-        * used for attributes or DocumentType entities 
-        */
-       function NamedNodeMap() {
-       }
-       function _findNodeIndex(list,node){
-               var i = list.length;
-               while(i--){
-                       if(list[i] === node){return i}
-               }
-       }
-
-       function _addNamedNode(el,list,newAttr,oldAttr){
-               if(oldAttr){
-                       list[_findNodeIndex(list,oldAttr)] = newAttr;
-               }else {
-                       list[list.length++] = newAttr;
-               }
-               if(el){
-                       newAttr.ownerElement = el;
-                       var doc = el.ownerDocument;
-                       if(doc){
-                               oldAttr && _onRemoveAttribute(doc,el,oldAttr);
-                               _onAddAttribute(doc,el,newAttr);
-                       }
-               }
-       }
-       function _removeNamedNode(el,list,attr){
-               //console.log('remove attr:'+attr)
-               var i = _findNodeIndex(list,attr);
-               if(i>=0){
-                       var lastIndex = list.length-1;
-                       while(i<lastIndex){
-                               list[i] = list[++i];
-                       }
-                       list.length = lastIndex;
-                       if(el){
-                               var doc = el.ownerDocument;
-                               if(doc){
-                                       _onRemoveAttribute(doc,el,attr);
-                                       attr.ownerElement = null;
-                               }
-                       }
-               }else {
-                       throw DOMException$2(NOT_FOUND_ERR,new Error(el.tagName+'@'+attr))
-               }
-       }
-       NamedNodeMap.prototype = {
-               length:0,
-               item:NodeList.prototype.item,
-               getNamedItem: function(key) {
-       //              if(key.indexOf(':')>0 || key == 'xmlns'){
-       //                      return null;
-       //              }
-                       //console.log()
-                       var i = this.length;
-                       while(i--){
-                               var attr = this[i];
-                               //console.log(attr.nodeName,key)
-                               if(attr.nodeName == key){
-                                       return attr;
-                               }
-                       }
-               },
-               setNamedItem: function(attr) {
-                       var el = attr.ownerElement;
-                       if(el && el!=this._ownerElement){
-                               throw new DOMException$2(INUSE_ATTRIBUTE_ERR);
-                       }
-                       var oldAttr = this.getNamedItem(attr.nodeName);
-                       _addNamedNode(this._ownerElement,this,attr,oldAttr);
-                       return oldAttr;
-               },
-               /* returns Node */
-               setNamedItemNS: function(attr) {// raises: WRONG_DOCUMENT_ERR,NO_MODIFICATION_ALLOWED_ERR,INUSE_ATTRIBUTE_ERR
-                       var el = attr.ownerElement, oldAttr;
-                       if(el && el!=this._ownerElement){
-                               throw new DOMException$2(INUSE_ATTRIBUTE_ERR);
-                       }
-                       oldAttr = this.getNamedItemNS(attr.namespaceURI,attr.localName);
-                       _addNamedNode(this._ownerElement,this,attr,oldAttr);
-                       return oldAttr;
-               },
-
-               /* returns Node */
-               removeNamedItem: function(key) {
-                       var attr = this.getNamedItem(key);
-                       _removeNamedNode(this._ownerElement,this,attr);
-                       return attr;
-                       
-                       
-               },// raises: NOT_FOUND_ERR,NO_MODIFICATION_ALLOWED_ERR
-               
-               //for level2
-               removeNamedItemNS:function(namespaceURI,localName){
-                       var attr = this.getNamedItemNS(namespaceURI,localName);
-                       _removeNamedNode(this._ownerElement,this,attr);
-                       return attr;
-               },
-               getNamedItemNS: function(namespaceURI, localName) {
-                       var i = this.length;
-                       while(i--){
-                               var node = this[i];
-                               if(node.localName == localName && node.namespaceURI == namespaceURI){
-                                       return node;
-                               }
-                       }
-                       return null;
-               }
-       };
-       /**
-        * @see http://www.w3.org/TR/REC-DOM-Level-1/level-one-core.html#ID-102161490
-        */
-       function DOMImplementation(/* Object */ features) {
-               this._features = {};
-               if (features) {
-                       for (var feature in features) {
-                                this._features = features[feature];
-                       }
-               }
-       }
-       DOMImplementation.prototype = {
-               hasFeature: function(/* string */ feature, /* string */ version) {
-                       var versions = this._features[feature.toLowerCase()];
-                       if (versions && (!version || version in versions)) {
-                               return true;
-                       } else {
-                               return false;
-                       }
-               },
-               // Introduced in DOM Level 2:
-               createDocument:function(namespaceURI,  qualifiedName, doctype){// raises:INVALID_CHARACTER_ERR,NAMESPACE_ERR,WRONG_DOCUMENT_ERR
-                       var doc = new Document();
-                       doc.implementation = this;
-                       doc.childNodes = new NodeList();
-                       doc.doctype = doctype;
-                       if(doctype){
-                               doc.appendChild(doctype);
-                       }
-                       if(qualifiedName){
-                               var root = doc.createElementNS(namespaceURI,qualifiedName);
-                               doc.appendChild(root);
-                       }
-                       return doc;
-               },
-               // Introduced in DOM Level 2:
-               createDocumentType:function(qualifiedName, publicId, systemId){// raises:INVALID_CHARACTER_ERR,NAMESPACE_ERR
-                       var node = new DocumentType();
-                       node.name = qualifiedName;
-                       node.nodeName = qualifiedName;
-                       node.publicId = publicId;
-                       node.systemId = systemId;
-                       // Introduced in DOM Level 2:
-                       //readonly attribute DOMString        internalSubset;
-                       
-                       //TODO:..
-                       //  readonly attribute NamedNodeMap     entities;
-                       //  readonly attribute NamedNodeMap     notations;
-                       return node;
-               }
-       };
+             if (entity instanceof osmWay && target.classed('target')) {
+               var choice = geoChooseEdge(context.graph().childNodes(entity), loc, context.projection);
+               var prev = entity.nodes[choice.index - 1];
+               var next = entity.nodes[choice.index];
+               context.perform(actionAddMidpoint({
+                 loc: choice.loc,
+                 edge: [prev, next]
+               }, osmNode()), _t('operations.add.annotation.vertex'));
+             } else if (entity.type === 'midpoint') {
+               context.perform(actionAddMidpoint({
+                 loc: entity.loc,
+                 edge: entity.edge
+               }, osmNode()), _t('operations.add.annotation.vertex'));
+             }
+           }
 
+           function selectElements() {
+             if (!checkSelectedIDs()) return;
+             var surface = context.surface();
+             surface.selectAll('.selected-member').classed('selected-member', false);
+             surface.selectAll('.selected').classed('selected', false);
+             surface.selectAll('.related').classed('related', false);
+             singularParent();
 
-       /**
-        * @see http://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113/core.html#ID-1950641247
-        */
+             if (_relatedParent) {
+               surface.selectAll(utilEntitySelector([_relatedParent])).classed('related', true);
+             }
 
-       function Node() {
-       }
-       Node.prototype = {
-               firstChild : null,
-               lastChild : null,
-               previousSibling : null,
-               nextSibling : null,
-               attributes : null,
-               parentNode : null,
-               childNodes : null,
-               ownerDocument : null,
-               nodeValue : null,
-               namespaceURI : null,
-               prefix : null,
-               localName : null,
-               // Modified in DOM Level 2:
-               insertBefore:function(newChild, refChild){//raises 
-                       return _insertBefore(this,newChild,refChild);
-               },
-               replaceChild:function(newChild, oldChild){//raises 
-                       this.insertBefore(newChild,oldChild);
-                       if(oldChild){
-                               this.removeChild(oldChild);
-                       }
-               },
-               removeChild:function(oldChild){
-                       return _removeChild(this,oldChild);
-               },
-               appendChild:function(newChild){
-                       return this.insertBefore(newChild,null);
-               },
-               hasChildNodes:function(){
-                       return this.firstChild != null;
-               },
-               cloneNode:function(deep){
-                       return cloneNode(this.ownerDocument||this,this,deep);
-               },
-               // Modified in DOM Level 2:
-               normalize:function(){
-                       var child = this.firstChild;
-                       while(child){
-                               var next = child.nextSibling;
-                               if(next && next.nodeType == TEXT_NODE && child.nodeType == TEXT_NODE){
-                                       this.removeChild(next);
-                                       child.appendData(next.data);
-                               }else {
-                                       child.normalize();
-                                       child = next;
-                               }
-                       }
-               },
-               // Introduced in DOM Level 2:
-               isSupported:function(feature, version){
-                       return this.ownerDocument.implementation.hasFeature(feature,version);
-               },
-           // Introduced in DOM Level 2:
-           hasAttributes:function(){
-               return this.attributes.length>0;
-           },
-           lookupPrefix:function(namespaceURI){
-               var el = this;
-               while(el){
-                       var map = el._nsMap;
-                       //console.dir(map)
-                       if(map){
-                               for(var n in map){
-                                       if(map[n] == namespaceURI){
-                                               return n;
-                                       }
-                               }
-                       }
-                       el = el.nodeType == ATTRIBUTE_NODE?el.ownerDocument : el.parentNode;
-               }
-               return null;
-           },
-           // Introduced in DOM Level 3:
-           lookupNamespaceURI:function(prefix){
-               var el = this;
-               while(el){
-                       var map = el._nsMap;
-                       //console.dir(map)
-                       if(map){
-                               if(prefix in map){
-                                       return map[prefix] ;
-                               }
-                       }
-                       el = el.nodeType == ATTRIBUTE_NODE?el.ownerDocument : el.parentNode;
-               }
-               return null;
-           },
-           // Introduced in DOM Level 3:
-           isDefaultNamespace:function(namespaceURI){
-               var prefix = this.lookupPrefix(namespaceURI);
-               return prefix == null;
+             if (context.map().withinEditableZoom()) {
+               // Apply selection styling if not in wide selection
+               surface.selectAll(utilDeepMemberSelector(selectedIDs, context.graph(), true
+               /* skipMultipolgonMembers */
+               )).classed('selected-member', true);
+               surface.selectAll(utilEntityOrDeepMemberSelector(selectedIDs, context.graph())).classed('selected', true);
+             }
            }
-       };
 
+           function esc() {
+             if (context.container().select('.combobox').size()) return;
+             context.enter(modeBrowse(context));
+           }
 
-       function _xmlEncoder(c){
-               return c == '<' && '&lt;' ||
-                c == '>' && '&gt;' ||
-                c == '&' && '&amp;' ||
-                c == '"' && '&quot;' ||
-                '&#'+c.charCodeAt()+';'
-       }
-
+           function firstVertex(d3_event) {
+             d3_event.preventDefault();
+             var entity = singular();
+             var parent = singularParent();
+             var way;
 
-       copy$2(NodeType,Node);
-       copy$2(NodeType,Node.prototype);
+             if (entity && entity.type === 'way') {
+               way = entity;
+             } else if (parent) {
+               way = context.entity(parent);
+             }
 
-       /**
-        * @param callback return true for continue,false for break
-        * @return boolean true: break visit;
-        */
-       function _visitNode(node,callback){
-               if(callback(node)){
-                       return true;
-               }
-               if(node = node.firstChild){
-                       do{
-                               if(_visitNode(node,callback)){return true}
-               }while(node=node.nextSibling)
-           }
-       }
-
-
-
-       function Document(){
-       }
-       function _onAddAttribute(doc,el,newAttr){
-               doc && doc._inc++;
-               var ns = newAttr.namespaceURI ;
-               if(ns == 'http://www.w3.org/2000/xmlns/'){
-                       //update namespace
-                       el._nsMap[newAttr.prefix?newAttr.localName:''] = newAttr.value;
-               }
-       }
-       function _onRemoveAttribute(doc,el,newAttr,remove){
-               doc && doc._inc++;
-               var ns = newAttr.namespaceURI ;
-               if(ns == 'http://www.w3.org/2000/xmlns/'){
-                       //update namespace
-                       delete el._nsMap[newAttr.prefix?newAttr.localName:''];
-               }
-       }
-       function _onUpdateChild(doc,el,newChild){
-               if(doc && doc._inc){
-                       doc._inc++;
-                       //update childNodes
-                       var cs = el.childNodes;
-                       if(newChild){
-                               cs[cs.length++] = newChild;
-                       }else {
-                               //console.log(1)
-                               var child = el.firstChild;
-                               var i = 0;
-                               while(child){
-                                       cs[i++] = child;
-                                       child =child.nextSibling;
-                               }
-                               cs.length = i;
-                       }
-               }
-       }
+             if (way) {
+               context.enter(modeSelect(context, [way.first()]).follow(true));
+             }
+           }
 
-       /**
-        * attributes;
-        * children;
-        * 
-        * writeable properties:
-        * nodeValue,Attr:value,CharacterData:data
-        * prefix
-        */
-       function _removeChild(parentNode,child){
-               var previous = child.previousSibling;
-               var next = child.nextSibling;
-               if(previous){
-                       previous.nextSibling = next;
-               }else {
-                       parentNode.firstChild = next;
-               }
-               if(next){
-                       next.previousSibling = previous;
-               }else {
-                       parentNode.lastChild = previous;
-               }
-               _onUpdateChild(parentNode.ownerDocument,parentNode);
-               return child;
-       }
-       /**
-        * preformance key(refChild == null)
-        */
-       function _insertBefore(parentNode,newChild,nextChild){
-               var cp = newChild.parentNode;
-               if(cp){
-                       cp.removeChild(newChild);//remove and update
-               }
-               if(newChild.nodeType === DOCUMENT_FRAGMENT_NODE){
-                       var newFirst = newChild.firstChild;
-                       if (newFirst == null) {
-                               return newChild;
-                       }
-                       var newLast = newChild.lastChild;
-               }else {
-                       newFirst = newLast = newChild;
-               }
-               var pre = nextChild ? nextChild.previousSibling : parentNode.lastChild;
-
-               newFirst.previousSibling = pre;
-               newLast.nextSibling = nextChild;
-               
-               
-               if(pre){
-                       pre.nextSibling = newFirst;
-               }else {
-                       parentNode.firstChild = newFirst;
-               }
-               if(nextChild == null){
-                       parentNode.lastChild = newLast;
-               }else {
-                       nextChild.previousSibling = newLast;
-               }
-               do{
-                       newFirst.parentNode = parentNode;
-               }while(newFirst !== newLast && (newFirst= newFirst.nextSibling))
-               _onUpdateChild(parentNode.ownerDocument||parentNode,parentNode);
-               //console.log(parentNode.lastChild.nextSibling == null)
-               if (newChild.nodeType == DOCUMENT_FRAGMENT_NODE) {
-                       newChild.firstChild = newChild.lastChild = null;
-               }
-               return newChild;
-       }
-       function _appendSingleChild(parentNode,newChild){
-               var cp = newChild.parentNode;
-               if(cp){
-                       var pre = parentNode.lastChild;
-                       cp.removeChild(newChild);//remove and update
-                       var pre = parentNode.lastChild;
-               }
-               var pre = parentNode.lastChild;
-               newChild.parentNode = parentNode;
-               newChild.previousSibling = pre;
-               newChild.nextSibling = null;
-               if(pre){
-                       pre.nextSibling = newChild;
-               }else {
-                       parentNode.firstChild = newChild;
-               }
-               parentNode.lastChild = newChild;
-               _onUpdateChild(parentNode.ownerDocument,parentNode,newChild);
-               return newChild;
-               //console.log("__aa",parentNode.lastChild.nextSibling == null)
-       }
-       Document.prototype = {
-               //implementation : null,
-               nodeName :  '#document',
-               nodeType :  DOCUMENT_NODE,
-               doctype :  null,
-               documentElement :  null,
-               _inc : 1,
-               
-               insertBefore :  function(newChild, refChild){//raises 
-                       if(newChild.nodeType == DOCUMENT_FRAGMENT_NODE){
-                               var child = newChild.firstChild;
-                               while(child){
-                                       var next = child.nextSibling;
-                                       this.insertBefore(child,refChild);
-                                       child = next;
-                               }
-                               return newChild;
-                       }
-                       if(this.documentElement == null && newChild.nodeType == ELEMENT_NODE){
-                               this.documentElement = newChild;
-                       }
-                       
-                       return _insertBefore(this,newChild,refChild),(newChild.ownerDocument = this),newChild;
-               },
-               removeChild :  function(oldChild){
-                       if(this.documentElement == oldChild){
-                               this.documentElement = null;
-                       }
-                       return _removeChild(this,oldChild);
-               },
-               // Introduced in DOM Level 2:
-               importNode : function(importedNode,deep){
-                       return importNode(this,importedNode,deep);
-               },
-               // Introduced in DOM Level 2:
-               getElementById :        function(id){
-                       var rtv = null;
-                       _visitNode(this.documentElement,function(node){
-                               if(node.nodeType == ELEMENT_NODE){
-                                       if(node.getAttribute('id') == id){
-                                               rtv = node;
-                                               return true;
-                                       }
-                               }
-                       });
-                       return rtv;
-               },
-               
-               //document factory method:
-               createElement : function(tagName){
-                       var node = new Element();
-                       node.ownerDocument = this;
-                       node.nodeName = tagName;
-                       node.tagName = tagName;
-                       node.childNodes = new NodeList();
-                       var attrs       = node.attributes = new NamedNodeMap();
-                       attrs._ownerElement = node;
-                       return node;
-               },
-               createDocumentFragment :        function(){
-                       var node = new DocumentFragment();
-                       node.ownerDocument = this;
-                       node.childNodes = new NodeList();
-                       return node;
-               },
-               createTextNode :        function(data){
-                       var node = new Text();
-                       node.ownerDocument = this;
-                       node.appendData(data);
-                       return node;
-               },
-               createComment : function(data){
-                       var node = new Comment();
-                       node.ownerDocument = this;
-                       node.appendData(data);
-                       return node;
-               },
-               createCDATASection :    function(data){
-                       var node = new CDATASection();
-                       node.ownerDocument = this;
-                       node.appendData(data);
-                       return node;
-               },
-               createProcessingInstruction :   function(target,data){
-                       var node = new ProcessingInstruction();
-                       node.ownerDocument = this;
-                       node.tagName = node.target = target;
-                       node.nodeValue= node.data = data;
-                       return node;
-               },
-               createAttribute :       function(name){
-                       var node = new Attr();
-                       node.ownerDocument      = this;
-                       node.name = name;
-                       node.nodeName   = name;
-                       node.localName = name;
-                       node.specified = true;
-                       return node;
-               },
-               createEntityReference : function(name){
-                       var node = new EntityReference();
-                       node.ownerDocument      = this;
-                       node.nodeName   = name;
-                       return node;
-               },
-               // Introduced in DOM Level 2:
-               createElementNS :       function(namespaceURI,qualifiedName){
-                       var node = new Element();
-                       var pl = qualifiedName.split(':');
-                       var attrs       = node.attributes = new NamedNodeMap();
-                       node.childNodes = new NodeList();
-                       node.ownerDocument = this;
-                       node.nodeName = qualifiedName;
-                       node.tagName = qualifiedName;
-                       node.namespaceURI = namespaceURI;
-                       if(pl.length == 2){
-                               node.prefix = pl[0];
-                               node.localName = pl[1];
-                       }else {
-                               //el.prefix = null;
-                               node.localName = qualifiedName;
-                       }
-                       attrs._ownerElement = node;
-                       return node;
-               },
-               // Introduced in DOM Level 2:
-               createAttributeNS :     function(namespaceURI,qualifiedName){
-                       var node = new Attr();
-                       var pl = qualifiedName.split(':');
-                       node.ownerDocument = this;
-                       node.nodeName = qualifiedName;
-                       node.name = qualifiedName;
-                       node.namespaceURI = namespaceURI;
-                       node.specified = true;
-                       if(pl.length == 2){
-                               node.prefix = pl[0];
-                               node.localName = pl[1];
-                       }else {
-                               //el.prefix = null;
-                               node.localName = qualifiedName;
-                       }
-                       return node;
-               }
-       };
-       _extends(Document,Node);
+           function lastVertex(d3_event) {
+             d3_event.preventDefault();
+             var entity = singular();
+             var parent = singularParent();
+             var way;
 
+             if (entity && entity.type === 'way') {
+               way = entity;
+             } else if (parent) {
+               way = context.entity(parent);
+             }
 
-       function Element() {
-               this._nsMap = {};
-       }Element.prototype = {
-               nodeType : ELEMENT_NODE,
-               hasAttribute : function(name){
-                       return this.getAttributeNode(name)!=null;
-               },
-               getAttribute : function(name){
-                       var attr = this.getAttributeNode(name);
-                       return attr && attr.value || '';
-               },
-               getAttributeNode : function(name){
-                       return this.attributes.getNamedItem(name);
-               },
-               setAttribute : function(name, value){
-                       var attr = this.ownerDocument.createAttribute(name);
-                       attr.value = attr.nodeValue = "" + value;
-                       this.setAttributeNode(attr);
-               },
-               removeAttribute : function(name){
-                       var attr = this.getAttributeNode(name);
-                       attr && this.removeAttributeNode(attr);
-               },
-               
-               //four real opeartion method
-               appendChild:function(newChild){
-                       if(newChild.nodeType === DOCUMENT_FRAGMENT_NODE){
-                               return this.insertBefore(newChild,null);
-                       }else {
-                               return _appendSingleChild(this,newChild);
-                       }
-               },
-               setAttributeNode : function(newAttr){
-                       return this.attributes.setNamedItem(newAttr);
-               },
-               setAttributeNodeNS : function(newAttr){
-                       return this.attributes.setNamedItemNS(newAttr);
-               },
-               removeAttributeNode : function(oldAttr){
-                       //console.log(this == oldAttr.ownerElement)
-                       return this.attributes.removeNamedItem(oldAttr.nodeName);
-               },
-               //get real attribute name,and remove it by removeAttributeNode
-               removeAttributeNS : function(namespaceURI, localName){
-                       var old = this.getAttributeNodeNS(namespaceURI, localName);
-                       old && this.removeAttributeNode(old);
-               },
-               
-               hasAttributeNS : function(namespaceURI, localName){
-                       return this.getAttributeNodeNS(namespaceURI, localName)!=null;
-               },
-               getAttributeNS : function(namespaceURI, localName){
-                       var attr = this.getAttributeNodeNS(namespaceURI, localName);
-                       return attr && attr.value || '';
-               },
-               setAttributeNS : function(namespaceURI, qualifiedName, value){
-                       var attr = this.ownerDocument.createAttributeNS(namespaceURI, qualifiedName);
-                       attr.value = attr.nodeValue = "" + value;
-                       this.setAttributeNode(attr);
-               },
-               getAttributeNodeNS : function(namespaceURI, localName){
-                       return this.attributes.getNamedItemNS(namespaceURI, localName);
-               },
-               
-               getElementsByTagName : function(tagName){
-                       return new LiveNodeList(this,function(base){
-                               var ls = [];
-                               _visitNode(base,function(node){
-                                       if(node !== base && node.nodeType == ELEMENT_NODE && (tagName === '*' || node.tagName == tagName)){
-                                               ls.push(node);
-                                       }
-                               });
-                               return ls;
-                       });
-               },
-               getElementsByTagNameNS : function(namespaceURI, localName){
-                       return new LiveNodeList(this,function(base){
-                               var ls = [];
-                               _visitNode(base,function(node){
-                                       if(node !== base && node.nodeType === ELEMENT_NODE && (namespaceURI === '*' || node.namespaceURI === namespaceURI) && (localName === '*' || node.localName == localName)){
-                                               ls.push(node);
-                                       }
-                               });
-                               return ls;
-                               
-                       });
-               }
-       };
-       Document.prototype.getElementsByTagName = Element.prototype.getElementsByTagName;
-       Document.prototype.getElementsByTagNameNS = Element.prototype.getElementsByTagNameNS;
+             if (way) {
+               context.enter(modeSelect(context, [way.last()]).follow(true));
+             }
+           }
 
+           function previousVertex(d3_event) {
+             d3_event.preventDefault();
+             var parent = singularParent();
+             if (!parent) return;
+             var way = context.entity(parent);
+             var length = way.nodes.length;
+             var curr = way.nodes.indexOf(selectedIDs[0]);
+             var index = -1;
 
-       _extends(Element,Node);
-       function Attr() {
-       }Attr.prototype.nodeType = ATTRIBUTE_NODE;
-       _extends(Attr,Node);
-
-
-       function CharacterData() {
-       }CharacterData.prototype = {
-               data : '',
-               substringData : function(offset, count) {
-                       return this.data.substring(offset, offset+count);
-               },
-               appendData: function(text) {
-                       text = this.data+text;
-                       this.nodeValue = this.data = text;
-                       this.length = text.length;
-               },
-               insertData: function(offset,text) {
-                       this.replaceData(offset,0,text);
-               
-               },
-               appendChild:function(newChild){
-                       throw new Error(ExceptionMessage[HIERARCHY_REQUEST_ERR])
-               },
-               deleteData: function(offset, count) {
-                       this.replaceData(offset,count,"");
-               },
-               replaceData: function(offset, count, text) {
-                       var start = this.data.substring(0,offset);
-                       var end = this.data.substring(offset+count);
-                       text = start + text + end;
-                       this.nodeValue = this.data = text;
-                       this.length = text.length;
-               }
-       };
-       _extends(CharacterData,Node);
-       function Text() {
-       }Text.prototype = {
-               nodeName : "#text",
-               nodeType : TEXT_NODE,
-               splitText : function(offset) {
-                       var text = this.data;
-                       var newText = text.substring(offset);
-                       text = text.substring(0, offset);
-                       this.data = this.nodeValue = text;
-                       this.length = text.length;
-                       var newNode = this.ownerDocument.createTextNode(newText);
-                       if(this.parentNode){
-                               this.parentNode.insertBefore(newNode, this.nextSibling);
-                       }
-                       return newNode;
-               }
-       };
-       _extends(Text,CharacterData);
-       function Comment() {
-       }Comment.prototype = {
-               nodeName : "#comment",
-               nodeType : COMMENT_NODE
-       };
-       _extends(Comment,CharacterData);
+             if (curr > 0) {
+               index = curr - 1;
+             } else if (way.isClosed()) {
+               index = length - 2;
+             }
 
-       function CDATASection() {
-       }CDATASection.prototype = {
-               nodeName : "#cdata-section",
-               nodeType : CDATA_SECTION_NODE
-       };
-       _extends(CDATASection,CharacterData);
+             if (index !== -1) {
+               context.enter(modeSelect(context, [way.nodes[index]]).follow(true));
+             }
+           }
 
+           function nextVertex(d3_event) {
+             d3_event.preventDefault();
+             var parent = singularParent();
+             if (!parent) return;
+             var way = context.entity(parent);
+             var length = way.nodes.length;
+             var curr = way.nodes.indexOf(selectedIDs[0]);
+             var index = -1;
 
-       function DocumentType() {
-       }DocumentType.prototype.nodeType = DOCUMENT_TYPE_NODE;
-       _extends(DocumentType,Node);
+             if (curr < length - 1) {
+               index = curr + 1;
+             } else if (way.isClosed()) {
+               index = 0;
+             }
 
-       function Notation() {
-       }Notation.prototype.nodeType = NOTATION_NODE;
-       _extends(Notation,Node);
+             if (index !== -1) {
+               context.enter(modeSelect(context, [way.nodes[index]]).follow(true));
+             }
+           }
 
-       function Entity() {
-       }Entity.prototype.nodeType = ENTITY_NODE;
-       _extends(Entity,Node);
+           function nextParent(d3_event) {
+             d3_event.preventDefault();
+             var parents = commonParents();
+             if (!parents || parents.length < 2) return;
+             var index = parents.indexOf(_relatedParent);
 
-       function EntityReference() {
-       }EntityReference.prototype.nodeType = ENTITY_REFERENCE_NODE;
-       _extends(EntityReference,Node);
+             if (index < 0 || index > parents.length - 2) {
+               _relatedParent = parents[0];
+             } else {
+               _relatedParent = parents[index + 1];
+             }
 
-       function DocumentFragment() {
-       }DocumentFragment.prototype.nodeName =  "#document-fragment";
-       DocumentFragment.prototype.nodeType =   DOCUMENT_FRAGMENT_NODE;
-       _extends(DocumentFragment,Node);
+             var surface = context.surface();
+             surface.selectAll('.related').classed('related', false);
 
+             if (_relatedParent) {
+               surface.selectAll(utilEntitySelector([_relatedParent])).classed('related', true);
+             }
+           }
+         };
 
-       function ProcessingInstruction() {
-       }
-       ProcessingInstruction.prototype.nodeType = PROCESSING_INSTRUCTION_NODE;
-       _extends(ProcessingInstruction,Node);
-       function XMLSerializer$1(){}
-       XMLSerializer$1.prototype.serializeToString = function(node,isHtml,nodeFilter){
-               return nodeSerializeToString.call(node,isHtml,nodeFilter);
-       };
-       Node.prototype.toString = nodeSerializeToString;
-       function nodeSerializeToString(isHtml,nodeFilter){
-               var buf = [];
-               var refNode = this.nodeType == 9?this.documentElement:this;
-               var prefix = refNode.prefix;
-               var uri = refNode.namespaceURI;
-               
-               if(uri && prefix == null){
-                       //console.log(prefix)
-                       var prefix = refNode.lookupPrefix(uri);
-                       if(prefix == null){
-                               //isHTML = true;
-                               var visibleNamespaces=[
-                               {namespace:uri,prefix:null}
-                               //{namespace:uri,prefix:''}
-                               ];
-                       }
-               }
-               serializeToString(this,buf,isHtml,nodeFilter,visibleNamespaces);
-               //console.log('###',this.nodeType,uri,prefix,buf.join(''))
-               return buf.join('');
-       }
-       function needNamespaceDefine(node,isHTML, visibleNamespaces) {
-               var prefix = node.prefix||'';
-               var uri = node.namespaceURI;
-               if (!prefix && !uri){
-                       return false;
-               }
-               if (prefix === "xml" && uri === "http://www.w3.org/XML/1998/namespace" 
-                       || uri == 'http://www.w3.org/2000/xmlns/'){
-                       return false;
-               }
-               
-               var i = visibleNamespaces.length; 
-               //console.log('@@@@',node.tagName,prefix,uri,visibleNamespaces)
-               while (i--) {
-                       var ns = visibleNamespaces[i];
-                       // get namespace prefix
-                       //console.log(node.nodeType,node.tagName,ns.prefix,prefix)
-                       if (ns.prefix == prefix){
-                               return ns.namespace != uri;
-                       }
-               }
-               //console.log(isHTML,uri,prefix=='')
-               //if(isHTML && prefix ==null && uri == 'http://www.w3.org/1999/xhtml'){
-               //      return false;
-               //}
-               //node.flag = '11111'
-               //console.error(3,true,node.flag,node.prefix,node.namespaceURI)
-               return true;
-       }
-       function serializeToString(node,buf,isHTML,nodeFilter,visibleNamespaces){
-               if(nodeFilter){
-                       node = nodeFilter(node);
-                       if(node){
-                               if(typeof node == 'string'){
-                                       buf.push(node);
-                                       return;
-                               }
-                       }else {
-                               return;
-                       }
-                       //buf.sort.apply(attrs, attributeSorter);
-               }
-               switch(node.nodeType){
-               case ELEMENT_NODE:
-                       if (!visibleNamespaces) visibleNamespaces = [];
-                       var startVisibleNamespaces = visibleNamespaces.length;
-                       var attrs = node.attributes;
-                       var len = attrs.length;
-                       var child = node.firstChild;
-                       var nodeName = node.tagName;
-                       
-                       isHTML =  (htmlns === node.namespaceURI) ||isHTML; 
-                       buf.push('<',nodeName);
-                       
-                       
-                       
-                       for(var i=0;i<len;i++){
-                               // add namespaces for attributes
-                               var attr = attrs.item(i);
-                               if (attr.prefix == 'xmlns') {
-                                       visibleNamespaces.push({ prefix: attr.localName, namespace: attr.value });
-                               }else if(attr.nodeName == 'xmlns'){
-                                       visibleNamespaces.push({ prefix: '', namespace: attr.value });
-                               }
-                       }
-                       for(var i=0;i<len;i++){
-                               var attr = attrs.item(i);
-                               if (needNamespaceDefine(attr,isHTML, visibleNamespaces)) {
-                                       var prefix = attr.prefix||'';
-                                       var uri = attr.namespaceURI;
-                                       var ns = prefix ? ' xmlns:' + prefix : " xmlns";
-                                       buf.push(ns, '="' , uri , '"');
-                                       visibleNamespaces.push({ prefix: prefix, namespace:uri });
-                               }
-                               serializeToString(attr,buf,isHTML,nodeFilter,visibleNamespaces);
-                       }
-                       // add namespace for current node               
-                       if (needNamespaceDefine(node,isHTML, visibleNamespaces)) {
-                               var prefix = node.prefix||'';
-                               var uri = node.namespaceURI;
-                               var ns = prefix ? ' xmlns:' + prefix : " xmlns";
-                               buf.push(ns, '="' , uri , '"');
-                               visibleNamespaces.push({ prefix: prefix, namespace:uri });
-                       }
-                       
-                       if(child || isHTML && !/^(?:meta|link|img|br|hr|input)$/i.test(nodeName)){
-                               buf.push('>');
-                               //if is cdata child node
-                               if(isHTML && /^script$/i.test(nodeName)){
-                                       while(child){
-                                               if(child.data){
-                                                       buf.push(child.data);
-                                               }else {
-                                                       serializeToString(child,buf,isHTML,nodeFilter,visibleNamespaces);
-                                               }
-                                               child = child.nextSibling;
-                                       }
-                               }else
-                               {
-                                       while(child){
-                                               serializeToString(child,buf,isHTML,nodeFilter,visibleNamespaces);
-                                               child = child.nextSibling;
-                                       }
-                               }
-                               buf.push('</',nodeName,'>');
-                       }else {
-                               buf.push('/>');
-                       }
-                       // remove added visible namespaces
-                       //visibleNamespaces.length = startVisibleNamespaces;
-                       return;
-               case DOCUMENT_NODE:
-               case DOCUMENT_FRAGMENT_NODE:
-                       var child = node.firstChild;
-                       while(child){
-                               serializeToString(child,buf,isHTML,nodeFilter,visibleNamespaces);
-                               child = child.nextSibling;
-                       }
-                       return;
-               case ATTRIBUTE_NODE:
-                       return buf.push(' ',node.name,'="',node.value.replace(/[<&"]/g,_xmlEncoder),'"');
-               case TEXT_NODE:
-                       return buf.push(node.data.replace(/[<&]/g,_xmlEncoder));
-               case CDATA_SECTION_NODE:
-                       return buf.push( '<![CDATA[',node.data,']]>');
-               case COMMENT_NODE:
-                       return buf.push( "<!--",node.data,"-->");
-               case DOCUMENT_TYPE_NODE:
-                       var pubid = node.publicId;
-                       var sysid = node.systemId;
-                       buf.push('<!DOCTYPE ',node.name);
-                       if(pubid){
-                               buf.push(' PUBLIC "',pubid);
-                               if (sysid && sysid!='.') {
-                                       buf.push( '" "',sysid);
-                               }
-                               buf.push('">');
-                       }else if(sysid && sysid!='.'){
-                               buf.push(' SYSTEM "',sysid,'">');
-                       }else {
-                               var sub = node.internalSubset;
-                               if(sub){
-                                       buf.push(" [",sub,"]");
-                               }
-                               buf.push(">");
-                       }
-                       return;
-               case PROCESSING_INSTRUCTION_NODE:
-                       return buf.push( "<?",node.target," ",node.data,"?>");
-               case ENTITY_REFERENCE_NODE:
-                       return buf.push( '&',node.nodeName,';');
-               //case ENTITY_NODE:
-               //case NOTATION_NODE:
-               default:
-                       buf.push('??',node.nodeName);
-               }
-       }
-       function importNode(doc,node,deep){
-               var node2;
-               switch (node.nodeType) {
-               case ELEMENT_NODE:
-                       node2 = node.cloneNode(false);
-                       node2.ownerDocument = doc;
-                       //var attrs = node2.attributes;
-                       //var len = attrs.length;
-                       //for(var i=0;i<len;i++){
-                               //node2.setAttributeNodeNS(importNode(doc,attrs.item(i),deep));
-                       //}
-               case DOCUMENT_FRAGMENT_NODE:
-                       break;
-               case ATTRIBUTE_NODE:
-                       deep = true;
-                       break;
-               //case ENTITY_REFERENCE_NODE:
-               //case PROCESSING_INSTRUCTION_NODE:
-               ////case TEXT_NODE:
-               //case CDATA_SECTION_NODE:
-               //case COMMENT_NODE:
-               //      deep = false;
-               //      break;
-               //case DOCUMENT_NODE:
-               //case DOCUMENT_TYPE_NODE:
-               //cannot be imported.
-               //case ENTITY_NODE:
-               //case NOTATION_NODE:
-               //can not hit in level3
-               //default:throw e;
-               }
-               if(!node2){
-                       node2 = node.cloneNode(false);//false
-               }
-               node2.ownerDocument = doc;
-               node2.parentNode = null;
-               if(deep){
-                       var child = node.firstChild;
-                       while(child){
-                               node2.appendChild(importNode(doc,child,deep));
-                               child = child.nextSibling;
-                       }
-               }
-               return node2;
-       }
-       //
-       //var _relationMap = {firstChild:1,lastChild:1,previousSibling:1,nextSibling:1,
-       //                                      attributes:1,childNodes:1,parentNode:1,documentElement:1,doctype,};
-       function cloneNode(doc,node,deep){
-               var node2 = new node.constructor();
-               for(var n in node){
-                       var v = node[n];
-                       if(typeof v != 'object' ){
-                               if(v != node2[n]){
-                                       node2[n] = v;
-                               }
-                       }
-               }
-               if(node.childNodes){
-                       node2.childNodes = new NodeList();
-               }
-               node2.ownerDocument = doc;
-               switch (node2.nodeType) {
-               case ELEMENT_NODE:
-                       var attrs       = node.attributes;
-                       var attrs2      = node2.attributes = new NamedNodeMap();
-                       var len = attrs.length;
-                       attrs2._ownerElement = node2;
-                       for(var i=0;i<len;i++){
-                               node2.setAttributeNode(cloneNode(doc,attrs.item(i),true));
-                       }
-                       break;  case ATTRIBUTE_NODE:
-                       deep = true;
-               }
-               if(deep){
-                       var child = node.firstChild;
-                       while(child){
-                               node2.appendChild(cloneNode(doc,child,deep));
-                               child = child.nextSibling;
-                       }
-               }
-               return node2;
-       }
-
-       function __set__(object,key,value){
-               object[key] = value;
-       }
-       //do dynamic
-       try{
-               if(Object.defineProperty){
-                       Object.defineProperty(LiveNodeList.prototype,'length',{
-                               get:function(){
-                                       _updateLiveList(this);
-                                       return this.$$length;
-                               }
-                       });
-                       Object.defineProperty(Node.prototype,'textContent',{
-                               get:function(){
-                                       return getTextContent(this);
-                               },
-                               set:function(data){
-                                       switch(this.nodeType){
-                                       case ELEMENT_NODE:
-                                       case DOCUMENT_FRAGMENT_NODE:
-                                               while(this.firstChild){
-                                                       this.removeChild(this.firstChild);
-                                               }
-                                               if(data || String(data)){
-                                                       this.appendChild(this.ownerDocument.createTextNode(data));
-                                               }
-                                               break;
-                                       default:
-                                               //TODO:
-                                               this.data = data;
-                                               this.value = data;
-                                               this.nodeValue = data;
-                                       }
-                               }
-                       });
-                       
-                       function getTextContent(node){
-                               switch(node.nodeType){
-                               case ELEMENT_NODE:
-                               case DOCUMENT_FRAGMENT_NODE:
-                                       var buf = [];
-                                       node = node.firstChild;
-                                       while(node){
-                                               if(node.nodeType!==7 && node.nodeType !==8){
-                                                       buf.push(getTextContent(node));
-                                               }
-                                               node = node.nextSibling;
-                                       }
-                                       return buf.join('');
-                               default:
-                                       return node.nodeValue;
-                               }
-                       }
-                       __set__ = function(object,key,value){
-                               //console.log(value)
-                               object['$$'+key] = value;
-                       };
-               }
-       }catch(e){//ie8
-       }
+         mode.exit = function () {
+           _newFeature = false;
 
-       //if(typeof require == 'function'){
-               var DOMImplementation_1 = DOMImplementation;
-               var XMLSerializer_1 = XMLSerializer$1;
-       //}
+           _operations.forEach(function (operation) {
+             if (operation.behavior) {
+               context.uninstall(operation.behavior);
+             }
+           });
 
-       var dom = {
-               DOMImplementation: DOMImplementation_1,
-               XMLSerializer: XMLSerializer_1
-       };
+           _operations = [];
+
+           _behaviors.forEach(context.uninstall);
+
+           select(document).call(keybinding.unbind);
+           context.ui().closeEditMenu();
+           context.history().on('change.select', null).on('undone.select', null).on('redone.select', null);
+           var surface = context.surface();
+           surface.selectAll('.selected-member').classed('selected-member', false);
+           surface.selectAll('.selected').classed('selected', false);
+           surface.selectAll('.highlighted').classed('highlighted', false);
+           surface.selectAll('.related').classed('related', false);
+           context.map().on('drawn.select', null);
+           context.ui().sidebar.hide();
+           context.features().forceVisible([]);
+           var entity = singular();
+
+           if (_newFeature && entity && entity.type === 'relation' && // no tags
+           Object.keys(entity.tags).length === 0 && // no parent relations
+           context.graph().parentRelations(entity).length === 0 && ( // no members or one member with no role
+           entity.members.length === 0 || entity.members.length === 1 && !entity.members[0].role)) {
+             // the user added this relation but didn't edit it at all, so just delete it
+             var deleteAction = actionDeleteRelation(entity.id, true
+             /* don't delete untagged members */
+             );
+             context.perform(deleteAction, _t('operations.delete.annotation.relation'));
+           }
+         };
 
-       var domParser = createCommonjsModule(function (module, exports) {
-       function DOMParser(options){
-               this.options = options ||{locator:{}};
-               
-       }
-       DOMParser.prototype.parseFromString = function(source,mimeType){
-               var options = this.options;
-               var sax =  new XMLReader();
-               var domBuilder = options.domBuilder || new DOMHandler();//contentHandler and LexicalHandler
-               var errorHandler = options.errorHandler;
-               var locator = options.locator;
-               var defaultNSMap = options.xmlns||{};
-               var entityMap = {'lt':'<','gt':'>','amp':'&','quot':'"','apos':"'"};
-               if(locator){
-                       domBuilder.setDocumentLocator(locator);
-               }
-               
-               sax.errorHandler = buildErrorHandler(errorHandler,domBuilder,locator);
-               sax.domBuilder = options.domBuilder || domBuilder;
-               if(/\/x?html?$/.test(mimeType)){
-                       entityMap.nbsp = '\xa0';
-                       entityMap.copy = '\xa9';
-                       defaultNSMap['']= 'http://www.w3.org/1999/xhtml';
-               }
-               defaultNSMap.xml = defaultNSMap.xml || 'http://www.w3.org/XML/1998/namespace';
-               if(source){
-                       sax.parse(source,defaultNSMap,entityMap);
-               }else {
-                       sax.errorHandler.error("invalid doc source");
-               }
-               return domBuilder.doc;
-       };
-       function buildErrorHandler(errorImpl,domBuilder,locator){
-               if(!errorImpl){
-                       if(domBuilder instanceof DOMHandler){
-                               return domBuilder;
-                       }
-                       errorImpl = domBuilder ;
-               }
-               var errorHandler = {};
-               var isCallback = errorImpl instanceof Function;
-               locator = locator||{};
-               function build(key){
-                       var fn = errorImpl[key];
-                       if(!fn && isCallback){
-                               fn = errorImpl.length == 2?function(msg){errorImpl(key,msg);}:errorImpl;
-                       }
-                       errorHandler[key] = fn && function(msg){
-                               fn('[xmldom '+key+']\t'+msg+_locator(locator));
-                       }||function(){};
-               }
-               build('warning');
-               build('error');
-               build('fatalError');
-               return errorHandler;
+         return mode;
        }
 
-       //console.log('#\n\n\n\n\n\n\n####')
-       /**
-        * +ContentHandler+ErrorHandler
-        * +LexicalHandler+EntityResolver2
-        * -DeclHandler-DTDHandler 
-        * 
-        * DefaultHandler:EntityResolver, DTDHandler, ContentHandler, ErrorHandler
-        * DefaultHandler2:DefaultHandler,LexicalHandler, DeclHandler, EntityResolver2
-        * @link http://www.saxproject.org/apidoc/org/xml/sax/helpers/DefaultHandler.html
-        */
-       function DOMHandler() {
-           this.cdata = false;
-       }
-       function position(locator,node){
-               node.lineNumber = locator.lineNumber;
-               node.columnNumber = locator.columnNumber;
-       }
-       /**
-        * @see org.xml.sax.ContentHandler#startDocument
-        * @link http://www.saxproject.org/apidoc/org/xml/sax/ContentHandler.html
-        */ 
-       DOMHandler.prototype = {
-               startDocument : function() {
-               this.doc = new DOMImplementation().createDocument(null, null, null);
-               if (this.locator) {
-                       this.doc.documentURI = this.locator.systemId;
-               }
-               },
-               startElement:function(namespaceURI, localName, qName, attrs) {
-                       var doc = this.doc;
-                   var el = doc.createElementNS(namespaceURI, qName||localName);
-                   var len = attrs.length;
-                   appendElement(this, el);
-                   this.currentElement = el;
-                   
-                       this.locator && position(this.locator,el);
-                   for (var i = 0 ; i < len; i++) {
-                       var namespaceURI = attrs.getURI(i);
-                       var value = attrs.getValue(i);
-                       var qName = attrs.getQName(i);
-                               var attr = doc.createAttributeNS(namespaceURI, qName);
-                               this.locator &&position(attrs.getLocator(i),attr);
-                               attr.value = attr.nodeValue = value;
-                               el.setAttributeNode(attr);
-                   }
-               },
-               endElement:function(namespaceURI, localName, qName) {
-                       var current = this.currentElement;
-                       var tagName = current.tagName;
-                       this.currentElement = current.parentNode;
-               },
-               startPrefixMapping:function(prefix, uri) {
-               },
-               endPrefixMapping:function(prefix) {
-               },
-               processingInstruction:function(target, data) {
-                   var ins = this.doc.createProcessingInstruction(target, data);
-                   this.locator && position(this.locator,ins);
-                   appendElement(this, ins);
-               },
-               ignorableWhitespace:function(ch, start, length) {
-               },
-               characters:function(chars, start, length) {
-                       chars = _toString.apply(this,arguments);
-                       //console.log(chars)
-                       if(chars){
-                               if (this.cdata) {
-                                       var charNode = this.doc.createCDATASection(chars);
-                               } else {
-                                       var charNode = this.doc.createTextNode(chars);
-                               }
-                               if(this.currentElement){
-                                       this.currentElement.appendChild(charNode);
-                               }else if(/^\s*$/.test(chars)){
-                                       this.doc.appendChild(charNode);
-                                       //process xml
-                               }
-                               this.locator && position(this.locator,charNode);
-                       }
-               },
-               skippedEntity:function(name) {
-               },
-               endDocument:function() {
-                       this.doc.normalize();
-               },
-               setDocumentLocator:function (locator) {
-                   if(this.locator = locator){// && !('lineNumber' in locator)){
-                       locator.lineNumber = 0;
-                   }
-               },
-               //LexicalHandler
-               comment:function(chars, start, length) {
-                       chars = _toString.apply(this,arguments);
-                   var comm = this.doc.createComment(chars);
-                   this.locator && position(this.locator,comm);
-                   appendElement(this, comm);
-               },
-               
-               startCDATA:function() {
-                   //used in characters() methods
-                   this.cdata = true;
-               },
-               endCDATA:function() {
-                   this.cdata = false;
-               },
-               
-               startDTD:function(name, publicId, systemId) {
-                       var impl = this.doc.implementation;
-                   if (impl && impl.createDocumentType) {
-                       var dt = impl.createDocumentType(name, publicId, systemId);
-                       this.locator && position(this.locator,dt);
-                       appendElement(this, dt);
-                   }
-               },
-               /**
-                * @see org.xml.sax.ErrorHandler
-                * @link http://www.saxproject.org/apidoc/org/xml/sax/ErrorHandler.html
-                */
-               warning:function(error) {
-                       console.warn('[xmldom warning]\t'+error,_locator(this.locator));
-               },
-               error:function(error) {
-                       console.error('[xmldom error]\t'+error,_locator(this.locator));
-               },
-               fatalError:function(error) {
-                       console.error('[xmldom fatalError]\t'+error,_locator(this.locator));
-                   throw error;
-               }
-       };
-       function _locator(l){
-               if(l){
-                       return '\n@'+(l.systemId ||'')+'#[line:'+l.lineNumber+',col:'+l.columnNumber+']'
-               }
-       }
-       function _toString(chars,start,length){
-               if(typeof chars == 'string'){
-                       return chars.substr(start,length)
-               }else {//java sax connect width xmldom on rhino(what about: "? && !(chars instanceof String)")
-                       if(chars.length >= start+length || start){
-                               return new java.lang.String(chars,start,length)+'';
-                       }
-                       return chars;
-               }
-       }
+       function uiLasso(context) {
+         var group, polygon;
+         lasso.coordinates = [];
 
-       /*
-        * @link http://www.saxproject.org/apidoc/org/xml/sax/ext/LexicalHandler.html
-        * used method of org.xml.sax.ext.LexicalHandler:
-        *  #comment(chars, start, length)
-        *  #startCDATA()
-        *  #endCDATA()
-        *  #startDTD(name, publicId, systemId)
-        *
-        *
-        * IGNORED method of org.xml.sax.ext.LexicalHandler:
-        *  #endDTD()
-        *  #startEntity(name)
-        *  #endEntity(name)
-        *
-        *
-        * @link http://www.saxproject.org/apidoc/org/xml/sax/ext/DeclHandler.html
-        * IGNORED method of org.xml.sax.ext.DeclHandler
-        *      #attributeDecl(eName, aName, type, mode, value)
-        *  #elementDecl(name, model)
-        *  #externalEntityDecl(name, publicId, systemId)
-        *  #internalEntityDecl(name, value)
-        * @link http://www.saxproject.org/apidoc/org/xml/sax/ext/EntityResolver2.html
-        * IGNORED method of org.xml.sax.EntityResolver2
-        *  #resolveEntity(String name,String publicId,String baseURI,String systemId)
-        *  #resolveEntity(publicId, systemId)
-        *  #getExternalSubset(name, baseURI)
-        * @link http://www.saxproject.org/apidoc/org/xml/sax/DTDHandler.html
-        * IGNORED method of org.xml.sax.DTDHandler
-        *  #notationDecl(name, publicId, systemId) {};
-        *  #unparsedEntityDecl(name, publicId, systemId, notationName) {};
-        */
-       "endDTD,startEntity,endEntity,attributeDecl,elementDecl,externalEntityDecl,internalEntityDecl,resolveEntity,getExternalSubset,notationDecl,unparsedEntityDecl".replace(/\w+/g,function(key){
-               DOMHandler.prototype[key] = function(){return null};
-       });
+         function lasso(selection) {
+           context.container().classed('lasso', true);
+           group = selection.append('g').attr('class', 'lasso hide');
+           polygon = group.append('path').attr('class', 'lasso-path');
+           group.call(uiToggle(true));
+         }
 
-       /* Private static helpers treated below as private instance methods, so don't need to add these to the public API; we might use a Relator to also get rid of non-standard public properties */
-       function appendElement (hander,node) {
-           if (!hander.currentElement) {
-               hander.doc.appendChild(node);
-           } else {
-               hander.currentElement.appendChild(node);
+         function draw() {
+           if (polygon) {
+             polygon.data([lasso.coordinates]).attr('d', function (d) {
+               return 'M' + d.join(' L') + ' Z';
+             });
            }
-       }//appendChild and setAttributeNS are preformance key
+         }
 
-       //if(typeof require == 'function'){
-               var XMLReader = sax.XMLReader;
-               var DOMImplementation = exports.DOMImplementation = dom.DOMImplementation;
-               exports.XMLSerializer = dom.XMLSerializer ;
-               exports.DOMParser = DOMParser;
-       //}
-       });
+         lasso.extent = function () {
+           return lasso.coordinates.reduce(function (extent, point) {
+             return extent.extend(geoExtent(point));
+           }, geoExtent());
+         };
 
-       var togeojson = createCommonjsModule(function (module, exports) {
-       var toGeoJSON = (function() {
+         lasso.p = function (_) {
+           if (!arguments.length) return lasso;
+           lasso.coordinates.push(_);
+           draw();
+           return lasso;
+         };
 
-           var removeSpace = /\s*/g,
-               trimSpace = /^\s*|\s*$/g,
-               splitSpace = /\s+/;
-           // generate a short, numeric hash of a string
-           function okhash(x) {
-               if (!x || !x.length) return 0;
-               for (var i = 0, h = 0; i < x.length; i++) {
-                   h = ((h << 5) - h) + x.charCodeAt(i) | 0;
-               } return h;
-           }
-           // all Y children of X
-           function get(x, y) { return x.getElementsByTagName(y); }
-           function attr(x, y) { return x.getAttribute(y); }
-           function attrf(x, y) { return parseFloat(attr(x, y)); }
-           // one Y child of X, if any, otherwise null
-           function get1(x, y) { var n = get(x, y); return n.length ? n[0] : null; }
-           // https://developer.mozilla.org/en-US/docs/Web/API/Node.normalize
-           function norm(el) { if (el.normalize) { el.normalize(); } return el; }
-           // cast array x into numbers
-           function numarray(x) {
-               for (var j = 0, o = []; j < x.length; j++) { o[j] = parseFloat(x[j]); }
-               return o;
-           }
-           // get the content of a text node, if any
-           function nodeVal(x) {
-               if (x) { norm(x); }
-               return (x && x.textContent) || '';
-           }
-           // get the contents of multiple text nodes, if present
-           function getMulti(x, ys) {
-               var o = {}, n, k;
-               for (k = 0; k < ys.length; k++) {
-                   n = get1(x, ys[k]);
-                   if (n) o[ys[k]] = nodeVal(n);
-               }
-               return o;
-           }
-           // add properties of Y to X, overwriting if present in both
-           function extend(x, y) { for (var k in y) x[k] = y[k]; }
-           // get one coordinate from a coordinate array, if any
-           function coord1(v) { return numarray(v.replace(removeSpace, '').split(',')); }
-           // get all coordinates from a coordinate array as [[],[]]
-           function coord(v) {
-               var coords = v.replace(trimSpace, '').split(splitSpace),
-                   o = [];
-               for (var i = 0; i < coords.length; i++) {
-                   o.push(coord1(coords[i]));
-               }
-               return o;
-           }
-           function coordPair(x) {
-               var ll = [attrf(x, 'lon'), attrf(x, 'lat')],
-                   ele = get1(x, 'ele'),
-                   // handle namespaced attribute in browser
-                   heartRate = get1(x, 'gpxtpx:hr') || get1(x, 'hr'),
-                   time = get1(x, 'time'),
-                   e;
-               if (ele) {
-                   e = parseFloat(nodeVal(ele));
-                   if (!isNaN(e)) {
-                       ll.push(e);
-                   }
-               }
-               return {
-                   coordinates: ll,
-                   time: time ? nodeVal(time) : null,
-                   heartRate: heartRate ? parseFloat(nodeVal(heartRate)) : null
-               };
+         lasso.close = function () {
+           if (group) {
+             group.call(uiToggle(false, function () {
+               select(this).remove();
+             }));
            }
 
-           // create a new feature collection parent object
-           function fc() {
-               return {
-                   type: 'FeatureCollection',
-                   features: []
-               };
-           }
+           context.container().classed('lasso', false);
+         };
 
-           var serializer;
-           if (typeof XMLSerializer !== 'undefined') {
-               /* istanbul ignore next */
-               serializer = new XMLSerializer();
-           // only require xmldom in a node environment
-           } else if ( typeof process === 'object' && !process.browser) {
-               serializer = new (domParser.XMLSerializer)();
-           }
-           function xml2str(str) {
-               // IE9 will create a new XMLSerializer but it'll crash immediately.
-               // This line is ignored because we don't run coverage tests in IE9
-               /* istanbul ignore next */
-               if (str.xml !== undefined) return str.xml;
-               return serializer.serializeToString(str);
+         return lasso;
+       }
+
+       function behaviorLasso(context) {
+         // use pointer events on supported platforms; fallback to mouse events
+         var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
+
+         var behavior = function behavior(selection) {
+           var lasso;
+
+           function pointerdown(d3_event) {
+             var button = 0; // left
+
+             if (d3_event.button === button && d3_event.shiftKey === true) {
+               lasso = null;
+               select(window).on(_pointerPrefix + 'move.lasso', pointermove).on(_pointerPrefix + 'up.lasso', pointerup);
+               d3_event.stopPropagation();
+             }
            }
 
-           var t = {
-               kml: function(doc) {
-
-                   var gj = fc(),
-                       // styleindex keeps track of hashed styles in order to match features
-                       styleIndex = {}, styleByHash = {},
-                       // stylemapindex keeps track of style maps to expose in properties
-                       styleMapIndex = {},
-                       // atomic geospatial types supported by KML - MultiGeometry is
-                       // handled separately
-                       geotypes = ['Polygon', 'LineString', 'Point', 'Track', 'gx:Track'],
-                       // all root placemarks in the file
-                       placemarks = get(doc, 'Placemark'),
-                       styles = get(doc, 'Style'),
-                       styleMaps = get(doc, 'StyleMap');
-
-                   for (var k = 0; k < styles.length; k++) {
-                       var hash = okhash(xml2str(styles[k])).toString(16);
-                       styleIndex['#' + attr(styles[k], 'id')] = hash;
-                       styleByHash[hash] = styles[k];
-                   }
-                   for (var l = 0; l < styleMaps.length; l++) {
-                       styleIndex['#' + attr(styleMaps[l], 'id')] = okhash(xml2str(styleMaps[l])).toString(16);
-                       var pairs = get(styleMaps[l], 'Pair');
-                       var pairsMap = {};
-                       for (var m = 0; m < pairs.length; m++) {
-                           pairsMap[nodeVal(get1(pairs[m], 'key'))] = nodeVal(get1(pairs[m], 'styleUrl'));
-                       }
-                       styleMapIndex['#' + attr(styleMaps[l], 'id')] = pairsMap;
+           function pointermove() {
+             if (!lasso) {
+               lasso = uiLasso(context);
+               context.surface().call(lasso);
+             }
 
-                   }
-                   for (var j = 0; j < placemarks.length; j++) {
-                       gj.features = gj.features.concat(getPlacemark(placemarks[j]));
-                   }
-                   function kmlColor(v) {
-                       var color, opacity;
-                       v = v || '';
-                       if (v.substr(0, 1) === '#') { v = v.substr(1); }
-                       if (v.length === 6 || v.length === 3) { color = v; }
-                       if (v.length === 8) {
-                           opacity = parseInt(v.substr(0, 2), 16) / 255;
-                           color = '#' + v.substr(6, 2) +
-                               v.substr(4, 2) +
-                               v.substr(2, 2);
-                       }
-                       return [color, isNaN(opacity) ? undefined : opacity];
-                   }
-                   function gxCoord(v) { return numarray(v.split(' ')); }
-                   function gxCoords(root) {
-                       var elems = get(root, 'coord'), coords = [], times = [];
-                       if (elems.length === 0) elems = get(root, 'gx:coord');
-                       for (var i = 0; i < elems.length; i++) coords.push(gxCoord(nodeVal(elems[i])));
-                       var timeElems = get(root, 'when');
-                       for (var j = 0; j < timeElems.length; j++) times.push(nodeVal(timeElems[j]));
-                       return {
-                           coords: coords,
-                           times: times
-                       };
-                   }
-                   function getGeometry(root) {
-                       var geomNode, geomNodes, i, j, k, geoms = [], coordTimes = [];
-                       if (get1(root, 'MultiGeometry')) { return getGeometry(get1(root, 'MultiGeometry')); }
-                       if (get1(root, 'MultiTrack')) { return getGeometry(get1(root, 'MultiTrack')); }
-                       if (get1(root, 'gx:MultiTrack')) { return getGeometry(get1(root, 'gx:MultiTrack')); }
-                       for (i = 0; i < geotypes.length; i++) {
-                           geomNodes = get(root, geotypes[i]);
-                           if (geomNodes) {
-                               for (j = 0; j < geomNodes.length; j++) {
-                                   geomNode = geomNodes[j];
-                                   if (geotypes[i] === 'Point') {
-                                       geoms.push({
-                                           type: 'Point',
-                                           coordinates: coord1(nodeVal(get1(geomNode, 'coordinates')))
-                                       });
-                                   } else if (geotypes[i] === 'LineString') {
-                                       geoms.push({
-                                           type: 'LineString',
-                                           coordinates: coord(nodeVal(get1(geomNode, 'coordinates')))
-                                       });
-                                   } else if (geotypes[i] === 'Polygon') {
-                                       var rings = get(geomNode, 'LinearRing'),
-                                           coords = [];
-                                       for (k = 0; k < rings.length; k++) {
-                                           coords.push(coord(nodeVal(get1(rings[k], 'coordinates'))));
-                                       }
-                                       geoms.push({
-                                           type: 'Polygon',
-                                           coordinates: coords
-                                       });
-                                   } else if (geotypes[i] === 'Track' ||
-                                       geotypes[i] === 'gx:Track') {
-                                       var track = gxCoords(geomNode);
-                                       geoms.push({
-                                           type: 'LineString',
-                                           coordinates: track.coords
-                                       });
-                                       if (track.times.length) coordTimes.push(track.times);
-                                   }
-                               }
-                           }
-                       }
-                       return {
-                           geoms: geoms,
-                           coordTimes: coordTimes
-                       };
-                   }
-                   function getPlacemark(root) {
-                       var geomsAndTimes = getGeometry(root), i, properties = {},
-                           name = nodeVal(get1(root, 'name')),
-                           address = nodeVal(get1(root, 'address')),
-                           styleUrl = nodeVal(get1(root, 'styleUrl')),
-                           description = nodeVal(get1(root, 'description')),
-                           timeSpan = get1(root, 'TimeSpan'),
-                           timeStamp = get1(root, 'TimeStamp'),
-                           extendedData = get1(root, 'ExtendedData'),
-                           lineStyle = get1(root, 'LineStyle'),
-                           polyStyle = get1(root, 'PolyStyle'),
-                           visibility = get1(root, 'visibility');
-
-                       if (!geomsAndTimes.geoms.length) return [];
-                       if (name) properties.name = name;
-                       if (address) properties.address = address;
-                       if (styleUrl) {
-                           if (styleUrl[0] !== '#') {
-                               styleUrl = '#' + styleUrl;
-                           }
+             lasso.p(context.map().mouse());
+           }
 
-                           properties.styleUrl = styleUrl;
-                           if (styleIndex[styleUrl]) {
-                               properties.styleHash = styleIndex[styleUrl];
-                           }
-                           if (styleMapIndex[styleUrl]) {
-                               properties.styleMapHash = styleMapIndex[styleUrl];
-                               properties.styleHash = styleIndex[styleMapIndex[styleUrl].normal];
-                           }
-                           // Try to populate the lineStyle or polyStyle since we got the style hash
-                           var style = styleByHash[properties.styleHash];
-                           if (style) {
-                               if (!lineStyle) lineStyle = get1(style, 'LineStyle');
-                               if (!polyStyle) polyStyle = get1(style, 'PolyStyle');
-                           }
-                       }
-                       if (description) properties.description = description;
-                       if (timeSpan) {
-                           var begin = nodeVal(get1(timeSpan, 'begin'));
-                           var end = nodeVal(get1(timeSpan, 'end'));
-                           properties.timespan = { begin: begin, end: end };
-                       }
-                       if (timeStamp) {
-                           properties.timestamp = nodeVal(get1(timeStamp, 'when'));
-                       }
-                       if (lineStyle) {
-                           var linestyles = kmlColor(nodeVal(get1(lineStyle, 'color'))),
-                               color = linestyles[0],
-                               opacity = linestyles[1],
-                               width = parseFloat(nodeVal(get1(lineStyle, 'width')));
-                           if (color) properties.stroke = color;
-                           if (!isNaN(opacity)) properties['stroke-opacity'] = opacity;
-                           if (!isNaN(width)) properties['stroke-width'] = width;
-                       }
-                       if (polyStyle) {
-                           var polystyles = kmlColor(nodeVal(get1(polyStyle, 'color'))),
-                               pcolor = polystyles[0],
-                               popacity = polystyles[1],
-                               fill = nodeVal(get1(polyStyle, 'fill')),
-                               outline = nodeVal(get1(polyStyle, 'outline'));
-                           if (pcolor) properties.fill = pcolor;
-                           if (!isNaN(popacity)) properties['fill-opacity'] = popacity;
-                           if (fill) properties['fill-opacity'] = fill === '1' ? properties['fill-opacity'] || 1 : 0;
-                           if (outline) properties['stroke-opacity'] = outline === '1' ? properties['stroke-opacity'] || 1 : 0;
-                       }
-                       if (extendedData) {
-                           var datas = get(extendedData, 'Data'),
-                               simpleDatas = get(extendedData, 'SimpleData');
+           function normalize(a, b) {
+             return [[Math.min(a[0], b[0]), Math.min(a[1], b[1])], [Math.max(a[0], b[0]), Math.max(a[1], b[1])]];
+           }
 
-                           for (i = 0; i < datas.length; i++) {
-                               properties[datas[i].getAttribute('name')] = nodeVal(get1(datas[i], 'value'));
-                           }
-                           for (i = 0; i < simpleDatas.length; i++) {
-                               properties[simpleDatas[i].getAttribute('name')] = nodeVal(simpleDatas[i]);
-                           }
-                       }
-                       if (visibility) {
-                           properties.visibility = nodeVal(visibility);
-                       }
-                       if (geomsAndTimes.coordTimes.length) {
-                           properties.coordTimes = (geomsAndTimes.coordTimes.length === 1) ?
-                               geomsAndTimes.coordTimes[0] : geomsAndTimes.coordTimes;
-                       }
-                       var feature = {
-                           type: 'Feature',
-                           geometry: (geomsAndTimes.geoms.length === 1) ? geomsAndTimes.geoms[0] : {
-                               type: 'GeometryCollection',
-                               geometries: geomsAndTimes.geoms
-                           },
-                           properties: properties
-                       };
-                       if (attr(root, 'id')) feature.id = attr(root, 'id');
-                       return [feature];
-                   }
-                   return gj;
-               },
-               gpx: function(doc) {
-                   var i,
-                       tracks = get(doc, 'trk'),
-                       routes = get(doc, 'rte'),
-                       waypoints = get(doc, 'wpt'),
-                       // a feature collection
-                       gj = fc(),
-                       feature;
-                   for (i = 0; i < tracks.length; i++) {
-                       feature = getTrack(tracks[i]);
-                       if (feature) gj.features.push(feature);
-                   }
-                   for (i = 0; i < routes.length; i++) {
-                       feature = getRoute(routes[i]);
-                       if (feature) gj.features.push(feature);
-                   }
-                   for (i = 0; i < waypoints.length; i++) {
-                       gj.features.push(getPoint(waypoints[i]));
-                   }
-                   function getPoints(node, pointname) {
-                       var pts = get(node, pointname),
-                           line = [],
-                           times = [],
-                           heartRates = [],
-                           l = pts.length;
-                       if (l < 2) return {};  // Invalid line in GeoJSON
-                       for (var i = 0; i < l; i++) {
-                           var c = coordPair(pts[i]);
-                           line.push(c.coordinates);
-                           if (c.time) times.push(c.time);
-                           if (c.heartRate) heartRates.push(c.heartRate);
-                       }
-                       return {
-                           line: line,
-                           times: times,
-                           heartRates: heartRates
-                       };
-                   }
-                   function getTrack(node) {
-                       var segments = get(node, 'trkseg'),
-                           track = [],
-                           times = [],
-                           heartRates = [],
-                           line;
-                       for (var i = 0; i < segments.length; i++) {
-                           line = getPoints(segments[i], 'trkpt');
-                           if (line) {
-                               if (line.line) track.push(line.line);
-                               if (line.times && line.times.length) times.push(line.times);
-                               if (line.heartRates && line.heartRates.length) heartRates.push(line.heartRates);
-                           }
-                       }
-                       if (track.length === 0) return;
-                       var properties = getProperties(node);
-                       extend(properties, getLineStyle(get1(node, 'extensions')));
-                       if (times.length) properties.coordTimes = track.length === 1 ? times[0] : times;
-                       if (heartRates.length) properties.heartRates = track.length === 1 ? heartRates[0] : heartRates;
-                       return {
-                           type: 'Feature',
-                           properties: properties,
-                           geometry: {
-                               type: track.length === 1 ? 'LineString' : 'MultiLineString',
-                               coordinates: track.length === 1 ? track[0] : track
-                           }
-                       };
-                   }
-                   function getRoute(node) {
-                       var line = getPoints(node, 'rtept');
-                       if (!line.line) return;
-                       var prop = getProperties(node);
-                       extend(prop, getLineStyle(get1(node, 'extensions')));
-                       var routeObj = {
-                           type: 'Feature',
-                           properties: prop,
-                           geometry: {
-                               type: 'LineString',
-                               coordinates: line.line
-                           }
-                       };
-                       return routeObj;
-                   }
-                   function getPoint(node) {
-                       var prop = getProperties(node);
-                       extend(prop, getMulti(node, ['sym']));
-                       return {
-                           type: 'Feature',
-                           properties: prop,
-                           geometry: {
-                               type: 'Point',
-                               coordinates: coordPair(node).coordinates
-                           }
-                       };
-                   }
-                   function getLineStyle(extensions) {
-                       var style = {};
-                       if (extensions) {
-                           var lineStyle = get1(extensions, 'line');
-                           if (lineStyle) {
-                               var color = nodeVal(get1(lineStyle, 'color')),
-                                   opacity = parseFloat(nodeVal(get1(lineStyle, 'opacity'))),
-                                   width = parseFloat(nodeVal(get1(lineStyle, 'width')));
-                               if (color) style.stroke = color;
-                               if (!isNaN(opacity)) style['stroke-opacity'] = opacity;
-                               // GPX width is in mm, convert to px with 96 px per inch
-                               if (!isNaN(width)) style['stroke-width'] = width * 96 / 25.4;
-                           }
-                       }
-                       return style;
-                   }
-                   function getProperties(node) {
-                       var prop = getMulti(node, ['name', 'cmt', 'desc', 'type', 'time', 'keywords']),
-                           links = get(node, 'link');
-                       if (links.length) prop.links = [];
-                       for (var i = 0, link; i < links.length; i++) {
-                           link = { href: attr(links[i], 'href') };
-                           extend(link, getMulti(links[i], ['text', 'type']));
-                           prop.links.push(link);
-                       }
-                       return prop;
-                   }
-                   return gj;
-               }
-           };
-           return t;
-       })();
+           function lassoed() {
+             if (!lasso) return [];
+             var graph = context.graph();
+             var limitToNodes;
 
-       module.exports = toGeoJSON;
-       });
+             if (context.map().editableDataEnabled(true
+             /* skipZoomCheck */
+             ) && context.map().isInWideSelection()) {
+               // only select from the visible nodes
+               limitToNodes = new Set(utilGetAllNodes(context.selectedIDs(), graph));
+             } else if (!context.map().editableDataEnabled()) {
+               return [];
+             }
 
-       var _initialized = false;
-       var _enabled = false;
-       var _geojson;
+             var bounds = lasso.extent().map(context.projection.invert);
+             var extent = geoExtent(normalize(bounds[0], bounds[1]));
+             var intersects = context.history().intersects(extent).filter(function (entity) {
+               return entity.type === 'node' && (!limitToNodes || limitToNodes.has(entity)) && geoPointInPolygon(context.projection(entity.loc), lasso.coordinates) && !context.features().isHidden(entity, graph, entity.geometry(graph));
+             }); // sort the lassoed nodes as best we can
 
+             intersects.sort(function (node1, node2) {
+               var parents1 = graph.parentWays(node1);
+               var parents2 = graph.parentWays(node2);
 
-       function svgData(projection, context, dispatch) {
-           var throttledRedraw = throttle(function () { dispatch.call('change'); }, 1000);
-           var _showLabels = true;
-           var detected = utilDetect();
-           var layer = select(null);
-           var _vtService;
-           var _fileList;
-           var _template;
-           var _src;
+               if (parents1.length && parents2.length) {
+                 // both nodes are vertices
+                 var sharedParents = utilArrayIntersection(parents1, parents2);
 
+                 if (sharedParents.length) {
+                   var sharedParentNodes = sharedParents[0].nodes; // vertices are members of the same way; sort them in their listed order
 
-           function init() {
-               if (_initialized) return;  // run once
+                   return sharedParentNodes.indexOf(node1.id) - sharedParentNodes.indexOf(node2.id);
+                 } else {
+                   // vertices do not share a way; group them by their respective parent ways
+                   return parseFloat(parents1[0].id.slice(1)) - parseFloat(parents2[0].id.slice(1));
+                 }
+               } else if (parents1.length || parents2.length) {
+                 // only one node is a vertex; sort standalone points before vertices
+                 return parents1.length - parents2.length;
+               } // both nodes are standalone points; sort left to right
 
-               _geojson = {};
-               _enabled = true;
 
-               function over() {
-                   event.stopPropagation();
-                   event.preventDefault();
-                   event.dataTransfer.dropEffect = 'copy';
-               }
+               return node1.loc[0] - node2.loc[0];
+             });
+             return intersects.map(function (entity) {
+               return entity.id;
+             });
+           }
 
-               context.container()
-                   .attr('dropzone', 'copy')
-                   .on('drop.svgData', function() {
-                       event.stopPropagation();
-                       event.preventDefault();
-                       if (!detected.filedrop) return;
-                       drawData.fileList(event.dataTransfer.files);
-                   })
-                   .on('dragenter.svgData', over)
-                   .on('dragexit.svgData', over)
-                   .on('dragover.svgData', over);
+           function pointerup() {
+             select(window).on(_pointerPrefix + 'move.lasso', null).on(_pointerPrefix + 'up.lasso', null);
+             if (!lasso) return;
+             var ids = lassoed();
+             lasso.close();
 
-               _initialized = true;
+             if (ids.length) {
+               context.enter(modeSelect(context, ids));
+             }
            }
 
+           selection.on(_pointerPrefix + 'down.lasso', pointerdown);
+         };
+
+         behavior.off = function (selection) {
+           selection.on(_pointerPrefix + 'down.lasso', null);
+         };
 
-           function getService() {
-               if (services.vectorTile && !_vtService) {
-                   _vtService = services.vectorTile;
-                   _vtService.event.on('loadedData', throttledRedraw);
-               } else if (!services.vectorTile && _vtService) {
-                   _vtService = null;
-               }
+         return behavior;
+       }
 
-               return _vtService;
-           }
+       function modeBrowse(context) {
+         var mode = {
+           button: 'browse',
+           id: 'browse',
+           title: _t('modes.browse.title'),
+           description: _t('modes.browse.description')
+         };
+         var sidebar;
+
+         var _selectBehavior;
 
+         var _behaviors = [];
 
-           function showLayer() {
-               layerOn();
+         mode.selectBehavior = function (val) {
+           if (!arguments.length) return _selectBehavior;
+           _selectBehavior = val;
+           return mode;
+         };
 
-               layer
-                   .style('opacity', 0)
-                   .transition()
-                   .duration(250)
-                   .style('opacity', 1)
-                   .on('end', function () { dispatch.call('change'); });
+         mode.enter = function () {
+           if (!_behaviors.length) {
+             if (!_selectBehavior) _selectBehavior = behaviorSelect(context);
+             _behaviors = [behaviorPaste(context), behaviorHover(context).on('hover', context.ui().sidebar.hover), _selectBehavior, behaviorLasso(context), modeDragNode(context).behavior, modeDragNote(context).behavior];
            }
 
+           _behaviors.forEach(context.install); // Get focus on the body.
 
-           function hideLayer() {
-               throttledRedraw.cancel();
 
-               layer
-                   .transition()
-                   .duration(250)
-                   .style('opacity', 0)
-                   .on('end', layerOff);
+           if (document.activeElement && document.activeElement.blur) {
+             document.activeElement.blur();
            }
 
-
-           function layerOn() {
-               layer.style('display', 'block');
+           if (sidebar) {
+             context.ui().sidebar.show(sidebar);
+           } else {
+             context.ui().sidebar.select(null);
            }
+         };
+
+         mode.exit = function () {
+           context.ui().sidebar.hover.cancel();
 
+           _behaviors.forEach(context.uninstall);
 
-           function layerOff() {
-               layer.selectAll('.viewfield-group').remove();
-               layer.style('display', 'none');
+           if (sidebar) {
+             context.ui().sidebar.hide();
            }
+         };
+
+         mode.sidebar = function (_) {
+           if (!arguments.length) return sidebar;
+           sidebar = _;
+           return mode;
+         };
 
+         mode.operations = function () {
+           return [operationPaste(context)];
+         };
 
-           // ensure that all geojson features in a collection have IDs
-           function ensureIDs(gj) {
-               if (!gj) return null;
+         return mode;
+       }
 
-               if (gj.type === 'FeatureCollection') {
-                   for (var i = 0; i < gj.features.length; i++) {
-                       ensureFeatureID(gj.features[i]);
-                   }
-               } else {
-                   ensureFeatureID(gj);
-               }
-               return gj;
-           }
+       function behaviorAddWay(context) {
+         var dispatch$1 = dispatch('start', 'startFromWay', 'startFromNode');
+         var draw = behaviorDraw(context);
 
+         function behavior(surface) {
+           draw.on('click', function () {
+             dispatch$1.apply('start', this, arguments);
+           }).on('clickWay', function () {
+             dispatch$1.apply('startFromWay', this, arguments);
+           }).on('clickNode', function () {
+             dispatch$1.apply('startFromNode', this, arguments);
+           }).on('cancel', behavior.cancel).on('finish', behavior.cancel);
+           context.map().dblclickZoomEnable(false);
+           surface.call(draw);
+         }
 
-           // ensure that each single Feature object has a unique ID
-           function ensureFeatureID(feature) {
-               if (!feature) return;
-               feature.__featurehash__ = utilHashcode(fastJsonStableStringify(feature));
-               return feature;
+         behavior.off = function (surface) {
+           surface.call(draw.off);
+         };
+
+         behavior.cancel = function () {
+           window.setTimeout(function () {
+             context.map().dblclickZoomEnable(true);
+           }, 1000);
+           context.enter(modeBrowse(context));
+         };
+
+         return utilRebind(behavior, dispatch$1, 'on');
+       }
+
+       function behaviorHash(context) {
+         // cached window.location.hash
+         var _cachedHash = null; // allowable latitude range
+
+         var _latitudeLimit = 90 - 1e-8;
+
+         function computedHashParameters() {
+           var map = context.map();
+           var center = map.center();
+           var zoom = map.zoom();
+           var precision = Math.max(0, Math.ceil(Math.log(zoom) / Math.LN2));
+           var oldParams = utilObjectOmit(utilStringQs(window.location.hash), ['comment', 'source', 'hashtags', 'walkthrough']);
+           var newParams = {};
+           delete oldParams.id;
+           var selected = context.selectedIDs().filter(function (id) {
+             return context.hasEntity(id);
+           });
+
+           if (selected.length) {
+             newParams.id = selected.join(',');
            }
 
+           newParams.map = zoom.toFixed(2) + '/' + center[1].toFixed(precision) + '/' + center[0].toFixed(precision);
+           return Object.assign(oldParams, newParams);
+         }
+
+         function computedHash() {
+           return '#' + utilQsString(computedHashParameters(), true);
+         }
 
-           // Prefer an array of Features instead of a FeatureCollection
-           function getFeatures(gj) {
-               if (!gj) return [];
+         function computedTitle(includeChangeCount) {
+           var baseTitle = context.documentTitleBase() || 'iD';
+           var contextual;
+           var changeCount;
+           var titleID;
+           var selected = context.selectedIDs().filter(function (id) {
+             return context.hasEntity(id);
+           });
 
-               if (gj.type === 'FeatureCollection') {
-                   return gj.features;
-               } else {
-                   return [gj];
-               }
+           if (selected.length) {
+             var firstLabel = utilDisplayLabel(context.entity(selected[0]), context.graph());
+
+             if (selected.length > 1) {
+               contextual = _t('title.labeled_and_more', {
+                 labeled: firstLabel,
+                 count: selected.length - 1
+               });
+             } else {
+               contextual = firstLabel;
+             }
+
+             titleID = 'context';
            }
 
+           if (includeChangeCount) {
+             changeCount = context.history().difference().summary().length;
+
+             if (changeCount > 0) {
+               titleID = contextual ? 'changes_context' : 'changes';
+             }
+           }
 
-           function featureKey(d) {
-               return d.__featurehash__;
+           if (titleID) {
+             return _t('title.format.' + titleID, {
+               changes: changeCount,
+               base: baseTitle,
+               context: contextual
+             });
            }
 
+           return baseTitle;
+         }
+
+         function updateTitle(includeChangeCount) {
+           if (!context.setsDocumentTitle()) return;
+           var newTitle = computedTitle(includeChangeCount);
 
-           function isPolygon(d) {
-               return d.geometry.type === 'Polygon' || d.geometry.type === 'MultiPolygon';
+           if (document.title !== newTitle) {
+             document.title = newTitle;
            }
+         }
 
+         function updateHashIfNeeded() {
+           if (context.inIntro()) return;
+           var latestHash = computedHash();
 
-           function clipPathID(d) {
-               return 'ideditor-data-' + d.__featurehash__ + '-clippath';
+           if (_cachedHash !== latestHash) {
+             _cachedHash = latestHash; // Update the URL hash without affecting the browser navigation stack,
+             // though unavoidably creating a browser history entry
+
+             window.history.replaceState(null, computedTitle(false
+             /* includeChangeCount */
+             ), latestHash); // set the title we want displayed for the browser tab/window
+
+             updateTitle(true
+             /* includeChangeCount */
+             );
            }
+         }
+
+         var _throttledUpdate = throttle(updateHashIfNeeded, 500);
+
+         var _throttledUpdateTitle = throttle(function () {
+           updateTitle(true
+           /* includeChangeCount */
+           );
+         }, 500);
+
+         function hashchange() {
+           // ignore spurious hashchange events
+           if (window.location.hash === _cachedHash) return;
+           _cachedHash = window.location.hash;
+           var q = utilStringQs(_cachedHash);
+           var mapArgs = (q.map || '').split('/').map(Number);
+
+           if (mapArgs.length < 3 || mapArgs.some(isNaN)) {
+             // replace bogus hash
+             updateHashIfNeeded();
+           } else {
+             // don't update if the new hash already reflects the state of iD
+             if (_cachedHash === computedHash()) return;
+             var mode = context.mode();
+             context.map().centerZoom([mapArgs[2], Math.min(_latitudeLimit, Math.max(-_latitudeLimit, mapArgs[1]))], mapArgs[0]);
+
+             if (q.id && mode) {
+               var ids = q.id.split(',').filter(function (id) {
+                 return context.hasEntity(id);
+               });
+
+               if (ids.length && (mode.id === 'browse' || mode.id === 'select' && !utilArrayIdentical(mode.selectedIDs(), ids))) {
+                 context.enter(modeSelect(context, ids));
+                 return;
+               }
+             }
 
+             var center = context.map().center();
+             var dist = geoSphericalDistance(center, [mapArgs[2], mapArgs[1]]);
+             var maxdist = 500; // Don't allow the hash location to change too much while drawing
+             // This can happen if the user accidentally hit the back button.  #3996
 
-           function featureClasses(d) {
-               return [
-                   'data' + d.__featurehash__,
-                   d.geometry.type,
-                   isPolygon(d) ? 'area' : '',
-                   d.__layerID__ || ''
-               ].filter(Boolean).join(' ');
+             if (mode && mode.id.match(/^draw/) !== null && dist > maxdist) {
+               context.enter(modeBrowse(context));
+               return;
+             }
            }
+         }
 
+         function behavior() {
+           context.map().on('move.behaviorHash', _throttledUpdate);
+           context.history().on('change.behaviorHash', _throttledUpdateTitle);
+           context.on('enter.behaviorHash', _throttledUpdate);
+           select(window).on('hashchange.behaviorHash', hashchange);
 
-           function drawData(selection) {
-               var vtService = getService();
-               var getPath = svgPath(projection).geojson;
-               var getAreaPath = svgPath(projection, null, true).geojson;
-               var hasData = drawData.hasData();
+           if (window.location.hash) {
+             var q = utilStringQs(window.location.hash);
 
-               layer = selection.selectAll('.layer-mapdata')
-                   .data(_enabled && hasData ? [0] : []);
+             if (q.id) {
+               //if (!context.history().hasRestorableChanges()) {
+               // targeting specific features: download, select, and zoom to them
+               context.zoomToEntity(q.id.split(',')[0], !q.map); //}
+             }
 
-               layer.exit()
-                   .remove();
+             if (q.walkthrough === 'true') {
+               behavior.startWalkthrough = true;
+             }
 
-               layer = layer.enter()
-                   .append('g')
-                   .attr('class', 'layer-mapdata')
-                   .merge(layer);
+             if (q.map) {
+               behavior.hadHash = true;
+             }
 
-               var surface = context.surface();
-               if (!surface || surface.empty()) return;  // not ready to draw yet, starting up
+             hashchange();
+             updateTitle(false);
+           }
+         }
 
+         behavior.off = function () {
+           _throttledUpdate.cancel();
 
-               // Gather data
-               var geoData, polygonData;
-               if (_template && vtService) {   // fetch data from vector tile service
-                   var sourceID = _template;
-                   vtService.loadTiles(sourceID, _template, projection);
-                   geoData = vtService.data(sourceID, projection);
-               } else {
-                   geoData = getFeatures(_geojson);
-               }
-               geoData = geoData.filter(getPath);
-               polygonData = geoData.filter(isPolygon);
+           _throttledUpdateTitle.cancel();
 
+           context.map().on('move.behaviorHash', null);
+           context.on('enter.behaviorHash', null);
+           select(window).on('hashchange.behaviorHash', null);
+           window.location.hash = '';
+         };
 
-               // Draw clip paths for polygons
-               var clipPaths = surface.selectAll('defs').selectAll('.clipPath-data')
-                  .data(polygonData, featureKey);
+         return behavior;
+       }
 
-               clipPaths.exit()
-                  .remove();
+       /*
+           iD.coreDifference represents the difference between two graphs.
+           It knows how to calculate the set of entities that were
+           created, modified, or deleted, and also contains the logic
+           for recursively extending a difference to the complete set
+           of entities that will require a redraw, taking into account
+           child and parent relationships.
+        */
 
-               var clipPathsEnter = clipPaths.enter()
-                  .append('clipPath')
-                  .attr('class', 'clipPath-data')
-                  .attr('id', clipPathID);
+       function coreDifference(base, head) {
+         var _changes = {};
+         var _didChange = {}; // 'addition', 'deletion', 'geometry', 'properties'
 
-               clipPathsEnter
-                  .append('path');
+         var _diff = {};
 
-               clipPaths.merge(clipPathsEnter)
-                  .selectAll('path')
-                  .attr('d', getAreaPath);
+         function checkEntityID(id) {
+           var h = head.entities[id];
+           var b = base.entities[id];
+           if (h === b) return;
+           if (_changes[id]) return;
 
+           if (!h && b) {
+             _changes[id] = {
+               base: b,
+               head: h
+             };
+             _didChange.deletion = true;
+             return;
+           }
 
-               // Draw fill, shadow, stroke layers
-               var datagroups = layer
-                   .selectAll('g.datagroup')
-                   .data(['fill', 'shadow', 'stroke']);
+           if (h && !b) {
+             _changes[id] = {
+               base: b,
+               head: h
+             };
+             _didChange.addition = true;
+             return;
+           }
 
-               datagroups = datagroups.enter()
-                   .append('g')
-                   .attr('class', function(d) { return 'datagroup datagroup-' + d; })
-                   .merge(datagroups);
+           if (h && b) {
+             if (h.members && b.members && !fastDeepEqual(h.members, b.members)) {
+               _changes[id] = {
+                 base: b,
+                 head: h
+               };
+               _didChange.geometry = true;
+               _didChange.properties = true;
+               return;
+             }
 
+             if (h.loc && b.loc && !geoVecEqual(h.loc, b.loc)) {
+               _changes[id] = {
+                 base: b,
+                 head: h
+               };
+               _didChange.geometry = true;
+             }
 
-               // Draw paths
-               var pathData = {
-                   fill: polygonData,
-                   shadow: geoData,
-                   stroke: geoData
+             if (h.nodes && b.nodes && !fastDeepEqual(h.nodes, b.nodes)) {
+               _changes[id] = {
+                 base: b,
+                 head: h
                };
+               _didChange.geometry = true;
+             }
 
-               var paths = datagroups
-                   .selectAll('path')
-                   .data(function(layer) { return pathData[layer]; }, featureKey);
-
-               // exit
-               paths.exit()
-                   .remove();
-
-               // enter/update
-               paths = paths.enter()
-                   .append('path')
-                   .attr('class', function(d) {
-                       var datagroup = this.parentNode.__data__;
-                       return 'pathdata ' + datagroup + ' ' + featureClasses(d);
-                   })
-                   .attr('clip-path', function(d) {
-                       var datagroup = this.parentNode.__data__;
-                       return datagroup === 'fill' ? ('url(#' + clipPathID(d) + ')') : null;
-                   })
-                   .merge(paths)
-                   .attr('d', function(d) {
-                       var datagroup = this.parentNode.__data__;
-                       return datagroup === 'fill' ? getAreaPath(d) : getPath(d);
-                   });
+             if (h.tags && b.tags && !fastDeepEqual(h.tags, b.tags)) {
+               _changes[id] = {
+                 base: b,
+                 head: h
+               };
+               _didChange.properties = true;
+             }
+           }
+         }
 
+         function load() {
+           // HOT CODE: there can be many thousands of downloaded entities, so looping
+           // through them all can become a performance bottleneck. Optimize by
+           // resolving duplicates and using a basic `for` loop
+           var ids = utilArrayUniq(Object.keys(head.entities).concat(Object.keys(base.entities)));
 
-               // Draw labels
-               layer
-                   .call(drawLabels, 'label-halo', geoData)
-                   .call(drawLabels, 'label', geoData);
+           for (var i = 0; i < ids.length; i++) {
+             checkEntityID(ids[i]);
+           }
+         }
 
+         load();
 
-               function drawLabels(selection, textClass, data) {
-                   var labelPath = d3_geoPath(projection);
-                   var labelData = data.filter(function(d) {
-                       return _showLabels && d.properties && (d.properties.desc || d.properties.name);
-                   });
+         _diff.length = function length() {
+           return Object.keys(_changes).length;
+         };
 
-                   var labels = selection.selectAll('text.' + textClass)
-                       .data(labelData, featureKey);
+         _diff.changes = function changes() {
+           return _changes;
+         };
 
-                   // exit
-                   labels.exit()
-                       .remove();
+         _diff.didChange = _didChange; // pass true to include affected relation members
 
-                   // enter/update
-                   labels = labels.enter()
-                       .append('text')
-                       .attr('class', function(d) { return textClass + ' ' + featureClasses(d); })
-                       .merge(labels)
-                       .text(function(d) {
-                           return d.properties.desc || d.properties.name;
-                       })
-                       .attr('x', function(d) {
-                           var centroid = labelPath.centroid(d);
-                           return centroid[0] + 11;
-                       })
-                       .attr('y', function(d) {
-                           var centroid = labelPath.centroid(d);
-                           return centroid[1];
-                       });
-               }
-           }
+         _diff.extantIDs = function extantIDs(includeRelMembers) {
+           var result = new Set();
+           Object.keys(_changes).forEach(function (id) {
+             if (_changes[id].head) {
+               result.add(id);
+             }
 
+             var h = _changes[id].head;
+             var b = _changes[id].base;
+             var entity = h || b;
 
-           function getExtension(fileName) {
-               if (!fileName) return;
+             if (includeRelMembers && entity.type === 'relation') {
+               var mh = h ? h.members.map(function (m) {
+                 return m.id;
+               }) : [];
+               var mb = b ? b.members.map(function (m) {
+                 return m.id;
+               }) : [];
+               utilArrayUnion(mh, mb).forEach(function (memberID) {
+                 if (head.hasEntity(memberID)) {
+                   result.add(memberID);
+                 }
+               });
+             }
+           });
+           return Array.from(result);
+         };
 
-               var re = /\.(gpx|kml|(geo)?json)$/i;
-               var match = fileName.toLowerCase().match(re);
-               return match && match.length && match[0];
-           }
+         _diff.modified = function modified() {
+           var result = [];
+           Object.values(_changes).forEach(function (change) {
+             if (change.base && change.head) {
+               result.push(change.head);
+             }
+           });
+           return result;
+         };
 
+         _diff.created = function created() {
+           var result = [];
+           Object.values(_changes).forEach(function (change) {
+             if (!change.base && change.head) {
+               result.push(change.head);
+             }
+           });
+           return result;
+         };
 
-           function xmlToDom(textdata) {
-               return (new DOMParser()).parseFromString(textdata, 'text/xml');
-           }
+         _diff.deleted = function deleted() {
+           var result = [];
+           Object.values(_changes).forEach(function (change) {
+             if (change.base && !change.head) {
+               result.push(change.base);
+             }
+           });
+           return result;
+         };
 
+         _diff.summary = function summary() {
+           var relevant = {};
+           var keys = Object.keys(_changes);
 
-           drawData.setFile = function(extension, data) {
-               _template = null;
-               _fileList = null;
-               _geojson = null;
-               _src = null;
+           for (var i = 0; i < keys.length; i++) {
+             var change = _changes[keys[i]];
 
-               var gj;
-               switch (extension) {
-                   case '.gpx':
-                       gj = togeojson.gpx(xmlToDom(data));
-                       break;
-                   case '.kml':
-                       gj = togeojson.kml(xmlToDom(data));
-                       break;
-                   case '.geojson':
-                   case '.json':
-                       gj = JSON.parse(data);
-                       break;
+             if (change.head && change.head.geometry(head) !== 'vertex') {
+               addEntity(change.head, head, change.base ? 'modified' : 'created');
+             } else if (change.base && change.base.geometry(base) !== 'vertex') {
+               addEntity(change.base, base, 'deleted');
+             } else if (change.base && change.head) {
+               // modified vertex
+               var moved = !fastDeepEqual(change.base.loc, change.head.loc);
+               var retagged = !fastDeepEqual(change.base.tags, change.head.tags);
+
+               if (moved) {
+                 addParents(change.head);
                }
 
-               gj = gj || {};
-               if (Object.keys(gj).length) {
-                   _geojson = ensureIDs(gj);
-                   _src = extension + ' data file';
-                   this.fitZoom();
+               if (retagged || moved && change.head.hasInterestingTags()) {
+                 addEntity(change.head, head, 'modified');
                }
+             } else if (change.head && change.head.hasInterestingTags()) {
+               // created vertex
+               addEntity(change.head, head, 'created');
+             } else if (change.base && change.base.hasInterestingTags()) {
+               // deleted vertex
+               addEntity(change.base, base, 'deleted');
+             }
+           }
 
-               dispatch.call('change');
-               return this;
-           };
+           return Object.values(relevant);
 
+           function addEntity(entity, graph, changeType) {
+             relevant[entity.id] = {
+               entity: entity,
+               graph: graph,
+               changeType: changeType
+             };
+           }
 
-           drawData.showLabels = function(val) {
-               if (!arguments.length) return _showLabels;
+           function addParents(entity) {
+             var parents = head.parentWays(entity);
 
-               _showLabels = val;
-               return this;
-           };
+             for (var j = parents.length - 1; j >= 0; j--) {
+               var parent = parents[j];
 
+               if (!(parent.id in relevant)) {
+                 addEntity(parent, head, 'modified');
+               }
+             }
+           }
+         }; // returns complete set of entities that require a redraw
+         //  (optionally within given `extent`)
 
-           drawData.enabled = function(val) {
-               if (!arguments.length) return _enabled;
 
-               _enabled = val;
-               if (_enabled) {
-                   showLayer();
-               } else {
-                   hideLayer();
-               }
+         _diff.complete = function complete(extent) {
+           var result = {};
+           var id, change;
 
-               dispatch.call('change');
-               return this;
-           };
+           for (id in _changes) {
+             change = _changes[id];
+             var h = change.head;
+             var b = change.base;
+             var entity = h || b;
+             var i;
+             if (extent && (!h || !h.intersects(extent, head)) && (!b || !b.intersects(extent, base))) continue;
+             result[id] = h;
 
+             if (entity.type === 'way') {
+               var nh = h ? h.nodes : [];
+               var nb = b ? b.nodes : [];
+               var diff;
+               diff = utilArrayDifference(nh, nb);
 
-           drawData.hasData = function() {
-               var gj = _geojson || {};
-               return !!(_template || Object.keys(gj).length);
-           };
+               for (i = 0; i < diff.length; i++) {
+                 result[diff[i]] = head.hasEntity(diff[i]);
+               }
 
+               diff = utilArrayDifference(nb, nh);
 
-           drawData.template = function(val, src) {
-               if (!arguments.length) return _template;
+               for (i = 0; i < diff.length; i++) {
+                 result[diff[i]] = head.hasEntity(diff[i]);
+               }
+             }
 
-               // test source against OSM imagery blacklists..
-               var osm = context.connection();
-               if (osm) {
-                   var blacklists = osm.imageryBlacklists();
-                   var fail = false;
-                   var tested = 0;
-                   var regex;
+             if (entity.type === 'relation' && entity.isMultipolygon()) {
+               var mh = h ? h.members.map(function (m) {
+                 return m.id;
+               }) : [];
+               var mb = b ? b.members.map(function (m) {
+                 return m.id;
+               }) : [];
+               var ids = utilArrayUnion(mh, mb);
 
-                   for (var i = 0; i < blacklists.length; i++) {
-                       try {
-                           regex = new RegExp(blacklists[i]);
-                           fail = regex.test(val);
-                           tested++;
-                           if (fail) break;
-                       } catch (e) {
-                           /* noop */
-                       }
-                   }
+               for (i = 0; i < ids.length; i++) {
+                 var member = head.hasEntity(ids[i]);
+                 if (!member) continue; // not downloaded
 
-                   // ensure at least one test was run.
-                   if (!tested) {
-                       regex = new RegExp('.*\.google(apis)?\..*/(vt|kh)[\?/].*([xyz]=.*){3}.*');
-                       fail = regex.test(val);
-                   }
+                 if (extent && !member.intersects(extent, head)) continue; // not visible
+
+                 result[ids[i]] = member;
                }
+             }
 
-               _template = val;
-               _fileList = null;
-               _geojson = null;
+             addParents(head.parentWays(entity), result);
+             addParents(head.parentRelations(entity), result);
+           }
 
-               // strip off the querystring/hash from the template,
-               // it often includes the access token
-               _src = src || ('vectortile:' + val.split(/[?#]/)[0]);
+           return result;
 
-               dispatch.call('change');
-               return this;
-           };
+           function addParents(parents, result) {
+             for (var i = 0; i < parents.length; i++) {
+               var parent = parents[i];
+               if (parent.id in result) continue;
+               result[parent.id] = parent;
+               addParents(head.parentRelations(parent), result);
+             }
+           }
+         };
 
+         return _diff;
+       }
 
-           drawData.geojson = function(gj, src) {
-               if (!arguments.length) return _geojson;
+       function coreTree(head) {
+         // tree for entities
+         var _rtree = new RBush();
 
-               _template = null;
-               _fileList = null;
-               _geojson = null;
-               _src = null;
+         var _bboxes = {}; // maintain a separate tree for granular way segments
 
-               gj = gj || {};
-               if (Object.keys(gj).length) {
-                   _geojson = ensureIDs(gj);
-                   _src = src || 'unknown.geojson';
-               }
+         var _segmentsRTree = new RBush();
 
-               dispatch.call('change');
-               return this;
-           };
+         var _segmentsBBoxes = {};
+         var _segmentsByWayId = {};
+         var tree = {};
 
+         function entityBBox(entity) {
+           var bbox = entity.extent(head).bbox();
+           bbox.id = entity.id;
+           _bboxes[entity.id] = bbox;
+           return bbox;
+         }
 
-           drawData.fileList = function(fileList) {
-               if (!arguments.length) return _fileList;
+         function segmentBBox(segment) {
+           var extent = segment.extent(head); // extent can be null if the node entities aren't in the graph for some reason
 
-               _template = null;
-               _fileList = fileList;
-               _geojson = null;
-               _src = null;
+           if (!extent) return null;
+           var bbox = extent.bbox();
+           bbox.segment = segment;
+           _segmentsBBoxes[segment.id] = bbox;
+           return bbox;
+         }
 
-               if (!fileList || !fileList.length) return this;
-               var f = fileList[0];
-               var extension = getExtension(f.name);
-               var reader = new FileReader();
-               reader.onload = (function() {
-                   return function(e) {
-                       drawData.setFile(extension, e.target.result);
-                   };
-               })();
+         function removeEntity(entity) {
+           _rtree.remove(_bboxes[entity.id]);
 
-               reader.readAsText(f);
+           delete _bboxes[entity.id];
 
-               return this;
-           };
+           if (_segmentsByWayId[entity.id]) {
+             _segmentsByWayId[entity.id].forEach(function (segment) {
+               _segmentsRTree.remove(_segmentsBBoxes[segment.id]);
 
+               delete _segmentsBBoxes[segment.id];
+             });
 
-           drawData.url = function(url, defaultExtension) {
-               _template = null;
-               _fileList = null;
-               _geojson = null;
-               _src = null;
-
-               // strip off any querystring/hash from the url before checking extension
-               var testUrl = url.split(/[?#]/)[0];
-               var extension = getExtension(testUrl) || defaultExtension;
-               if (extension) {
-                   _template = null;
-                   d3_text(url)
-                       .then(function(data) {
-                           drawData.setFile(extension, data);
-                       })
-                       .catch(function() {
-                           /* ignore */
-                       });
+             delete _segmentsByWayId[entity.id];
+           }
+         }
 
-               } else {
-                   drawData.template(url);
-               }
+         function loadEntities(entities) {
+           _rtree.load(entities.map(entityBBox));
 
-               return this;
-           };
+           var segments = [];
+           entities.forEach(function (entity) {
+             if (entity.segments) {
+               var entitySegments = entity.segments(head); // cache these to make them easy to remove later
 
+               _segmentsByWayId[entity.id] = entitySegments;
+               segments = segments.concat(entitySegments);
+             }
+           });
+           if (segments.length) _segmentsRTree.load(segments.map(segmentBBox).filter(Boolean));
+         }
 
-           drawData.getSrc = function() {
-               return _src || '';
-           };
+         function updateParents(entity, insertions, memo) {
+           head.parentWays(entity).forEach(function (way) {
+             if (_bboxes[way.id]) {
+               removeEntity(way);
+               insertions[way.id] = way;
+             }
 
+             updateParents(way, insertions, memo);
+           });
+           head.parentRelations(entity).forEach(function (relation) {
+             if (memo[entity.id]) return;
+             memo[entity.id] = true;
 
-           drawData.fitZoom = function() {
-               var features = getFeatures(_geojson);
-               if (!features.length) return;
-
-               var map = context.map();
-               var viewport = map.trimmedExtent().polygon();
-               var coords = features.reduce(function(coords, feature) {
-                   var geom = feature.geometry;
-                   if (!geom) return coords;
-
-                   var c = geom.coordinates;
-
-                   /* eslint-disable no-fallthrough */
-                   switch (geom.type) {
-                       case 'Point':
-                           c = [c];
-                       case 'MultiPoint':
-                       case 'LineString':
-                           break;
-
-                       case 'MultiPolygon':
-                           c = utilArrayFlatten(c);
-                       case 'Polygon':
-                       case 'MultiLineString':
-                           c = utilArrayFlatten(c);
-                           break;
-                   }
-                   /* eslint-enable no-fallthrough */
+             if (_bboxes[relation.id]) {
+               removeEntity(relation);
+               insertions[relation.id] = relation;
+             }
 
-                   return utilArrayUnion(coords, c);
-               }, []);
+             updateParents(relation, insertions, memo);
+           });
+         }
 
-               if (!geoPolygonIntersectsPolygon(viewport, coords, true)) {
-                   var extent = geoExtent(d3_geoBounds({ type: 'LineString', coordinates: coords }));
-                   map.centerZoom(extent.center(), map.trimmedExtentZoom(extent));
-               }
+         tree.rebase = function (entities, force) {
+           var insertions = {};
 
-               return this;
-           };
+           for (var i = 0; i < entities.length; i++) {
+             var entity = entities[i];
+             if (!entity.visible) continue;
 
+             if (head.entities.hasOwnProperty(entity.id) || _bboxes[entity.id]) {
+               if (!force) {
+                 continue;
+               } else if (_bboxes[entity.id]) {
+                 removeEntity(entity);
+               }
+             }
 
-           init();
-           return drawData;
-       }
+             insertions[entity.id] = entity;
+             updateParents(entity, insertions, {});
+           }
 
-       function svgDebug(projection, context) {
+           loadEntities(Object.values(insertions));
+           return tree;
+         };
 
-         function drawDebug(selection) {
-           const showTile = context.getDebug('tile');
-           const showCollision = context.getDebug('collision');
-           const showImagery = context.getDebug('imagery');
-           const showTouchTargets = context.getDebug('target');
-           const showDownloaded = context.getDebug('downloaded');
+         function updateToGraph(graph) {
+           if (graph === head) return;
+           var diff = coreDifference(head, graph);
+           head = graph;
+           var changed = diff.didChange;
+           if (!changed.addition && !changed.deletion && !changed.geometry) return;
+           var insertions = {};
 
-           let debugData = [];
-           if (showTile) {
-             debugData.push({ class: 'red', label: 'tile' });
-           }
-           if (showCollision) {
-             debugData.push({ class: 'yellow', label: 'collision' });
-           }
-           if (showImagery) {
-             debugData.push({ class: 'orange', label: 'imagery' });
+           if (changed.deletion) {
+             diff.deleted().forEach(function (entity) {
+               removeEntity(entity);
+             });
            }
-           if (showTouchTargets) {
-             debugData.push({ class: 'pink', label: 'touchTargets' });
+
+           if (changed.geometry) {
+             diff.modified().forEach(function (entity) {
+               removeEntity(entity);
+               insertions[entity.id] = entity;
+               updateParents(entity, insertions, {});
+             });
            }
-           if (showDownloaded) {
-             debugData.push({ class: 'purple', label: 'downloaded' });
+
+           if (changed.addition) {
+             diff.created().forEach(function (entity) {
+               insertions[entity.id] = entity;
+             });
            }
 
+           loadEntities(Object.values(insertions));
+         } // returns an array of entities with bounding boxes overlapping `extent` for the given `graph`
 
-           let legend = context.container().select('.main-content')
-             .selectAll('.debug-legend')
-             .data(debugData.length ? [0] : []);
 
-           legend.exit()
-             .remove();
+         tree.intersects = function (extent, graph) {
+           updateToGraph(graph);
+           return _rtree.search(extent.bbox()).map(function (bbox) {
+             return graph.entity(bbox.id);
+           });
+         }; // returns an array of segment objects with bounding boxes overlapping `extent` for the given `graph`
 
-           legend = legend.enter()
-             .append('div')
-             .attr('class', 'fillD debug-legend')
-             .merge(legend);
 
+         tree.waySegments = function (extent, graph) {
+           updateToGraph(graph);
+           return _segmentsRTree.search(extent.bbox()).map(function (bbox) {
+             return bbox.segment;
+           });
+         };
 
-           let legendItems = legend.selectAll('.debug-legend-item')
-             .data(debugData, d => d.label);
+         return tree;
+       }
 
-           legendItems.exit()
-             .remove();
+       function uiModal(selection, blocking) {
+         var _this = this;
 
-           legendItems.enter()
-             .append('span')
-             .attr('class', d => `debug-legend-item ${d.class}`)
-             .text(d => d.label);
+         var keybinding = utilKeybinding('modal');
+         var previous = selection.select('div.modal');
+         var animate = previous.empty();
+         previous.transition().duration(200).style('opacity', 0).remove();
+         var shaded = selection.append('div').attr('class', 'shaded').style('opacity', 0);
 
+         shaded.close = function () {
+           shaded.transition().duration(200).style('opacity', 0).remove();
+           modal.transition().duration(200).style('top', '0px');
+           select(document).call(keybinding.unbind);
+         };
 
-           let layer = selection.selectAll('.layer-debug')
-             .data(showImagery || showDownloaded ? [0] : []);
+         var modal = shaded.append('div').attr('class', 'modal fillL');
+         modal.append('input').attr('class', 'keytrap keytrap-first').on('focus.keytrap', moveFocusToLast);
 
-           layer.exit()
-             .remove();
+         if (!blocking) {
+           shaded.on('click.remove-modal', function (d3_event) {
+             if (d3_event.target === _this) {
+               shaded.close();
+             }
+           });
+           modal.append('button').attr('class', 'close').on('click', shaded.close).call(svgIcon('#iD-icon-close'));
+           keybinding.on('⌫', shaded.close).on('⎋', shaded.close);
+           select(document).call(keybinding);
+         }
 
-           layer = layer.enter()
-             .append('g')
-             .attr('class', 'layer-debug')
-             .merge(layer);
+         modal.append('div').attr('class', 'content');
+         modal.append('input').attr('class', 'keytrap keytrap-last').on('focus.keytrap', moveFocusToFirst);
 
+         if (animate) {
+           shaded.transition().style('opacity', 1);
+         } else {
+           shaded.style('opacity', 1);
+         }
 
-           // imagery
-           const extent = context.map().extent();
-           _mainFileFetcher.get('imagery')
-             .then(d => {
-               const hits = (showImagery && d.query.bbox(extent.rectangle(), true)) || [];
-               const features = hits.map(d => d.features[d.id]);
+         return shaded;
 
-               let imagery = layer.selectAll('path.debug-imagery')
-                 .data(features);
+         function moveFocusToFirst() {
+           var node = modal // there are additional rules about what's focusable, but this suits our purposes
+           .select('a, button, input:not(.keytrap), select, textarea').node();
 
-               imagery.exit()
-                 .remove();
+           if (node) {
+             node.focus();
+           } else {
+             select(this).node().blur();
+           }
+         }
 
-               imagery.enter()
-                 .append('path')
-                 .attr('class', 'debug-imagery debug orange');
-             })
-             .catch(() => { /* ignore */ });
+         function moveFocusToLast() {
+           var nodes = modal.selectAll('a, button, input:not(.keytrap), select, textarea').nodes();
 
-           // downloaded
-           const osm = context.connection();
-           let dataDownloaded = [];
-           if (osm && showDownloaded) {
-             const rtree = osm.caches('get').tile.rtree;
-             dataDownloaded = rtree.all().map(bbox => {
-               return {
-                 type: 'Feature',
-                 properties: { id: bbox.id },
-                 geometry: {
-                   type: 'Polygon',
-                   coordinates: [[
-                     [ bbox.minX, bbox.minY ],
-                     [ bbox.minX, bbox.maxY ],
-                     [ bbox.maxX, bbox.maxY ],
-                     [ bbox.maxX, bbox.minY ],
-                     [ bbox.minX, bbox.minY ]
-                   ]]
-                 }
-               };
-             });
+           if (nodes.length) {
+             nodes[nodes.length - 1].focus();
+           } else {
+             select(this).node().blur();
            }
+         }
+       }
 
-           let downloaded = layer
-             .selectAll('path.debug-downloaded')
-             .data(showDownloaded ? dataDownloaded : []);
+       function uiLoading(context) {
+         var _modalSelection = select(null);
 
-           downloaded.exit()
-             .remove();
+         var _message = '';
+         var _blocking = false;
 
-           downloaded.enter()
-             .append('path')
-             .attr('class', 'debug-downloaded debug purple');
+         var loading = function loading(selection) {
+           _modalSelection = uiModal(selection, _blocking);
 
-           // update
-           layer.selectAll('path')
-             .attr('d', svgPath(projection).geojson);
-         }
+           var loadertext = _modalSelection.select('.content').classed('loading-modal', true).append('div').attr('class', 'modal-section fillL');
 
+           loadertext.append('img').attr('class', 'loader').attr('src', context.imagePath('loader-white.gif'));
+           loadertext.append('h3').html(_message);
 
-         // This looks strange because `enabled` methods on other layers are
-         // chainable getter/setters, and this one is just a getter.
-         drawDebug.enabled = function() {
-           if (!arguments.length) {
-             return context.getDebug('tile') ||
-               context.getDebug('collision') ||
-               context.getDebug('imagery') ||
-               context.getDebug('target') ||
-               context.getDebug('downloaded');
-           } else {
-               return this;
-           }
+           _modalSelection.select('button.close').attr('class', 'hide');
+
+           return loading;
          };
 
+         loading.message = function (val) {
+           if (!arguments.length) return _message;
+           _message = val;
+           return loading;
+         };
 
-         return drawDebug;
+         loading.blocking = function (val) {
+           if (!arguments.length) return _blocking;
+           _blocking = val;
+           return loading;
+         };
+
+         loading.close = function () {
+           _modalSelection.remove();
+         };
+
+         loading.isShown = function () {
+           return _modalSelection && !_modalSelection.empty() && _modalSelection.node().parentNode;
+         };
+
+         return loading;
        }
 
-       let _layerEnabled = false;
-       let _qaService;
+       function coreHistory(context) {
+         var dispatch$1 = dispatch('reset', 'change', 'merge', 'restore', 'undone', 'redone');
 
-       function svgKeepRight(projection, context, dispatch) {
-         const throttledRedraw = throttle(() => dispatch.call('change'), 1000);
-         const minZoom = 12;
+         var _lock = utilSessionMutex('lock'); // restorable if iD not open in another window/tab and a saved history exists in localStorage
 
-         let touchLayer = select(null);
-         let drawLayer = select(null);
-         let layerVisible = false;
 
-         function markerPath(selection, klass) {
-           selection
-             .attr('class', klass)
-             .attr('transform', 'translate(-4, -24)')
-             .attr('d', 'M11.6,6.2H7.1l1.4-5.1C8.6,0.6,8.1,0,7.5,0H2.2C1.7,0,1.3,0.3,1.3,0.8L0,10.2c-0.1,0.6,0.4,1.1,0.9,1.1h4.6l-1.8,7.6C3.6,19.4,4.1,20,4.7,20c0.3,0,0.6-0.2,0.8-0.5l6.9-11.9C12.7,7,12.3,6.2,11.6,6.2z');
-         }
+         var _hasUnresolvedRestorableChanges = _lock.lock() && !!corePreferences(getKey('saved_history'));
 
-         // Loosely-coupled keepRight service for fetching issues.
-         function getService() {
-           if (services.keepRight && !_qaService) {
-             _qaService = services.keepRight;
-             _qaService.on('loaded', throttledRedraw);
-           } else if (!services.keepRight && _qaService) {
-             _qaService = null;
-           }
+         var duration = 150;
+         var _imageryUsed = [];
+         var _photoOverlaysUsed = [];
+         var _checkpoints = {};
 
-           return _qaService;
-         }
+         var _pausedGraph;
 
-         // Show the markers
-         function editOn() {
-           if (!layerVisible) {
-             layerVisible = true;
-             drawLayer
-               .style('display', 'block');
+         var _stack;
+
+         var _index;
+
+         var _tree; // internal _act, accepts list of actions and eased time
+
+
+         function _act(actions, t) {
+           actions = Array.prototype.slice.call(actions);
+           var annotation;
+
+           if (typeof actions[actions.length - 1] !== 'function') {
+             annotation = actions.pop();
            }
-         }
 
-         // Immediately remove the markers and their touch targets
-         function editOff() {
-           if (layerVisible) {
-             layerVisible = false;
-             drawLayer
-               .style('display', 'none');
-             drawLayer.selectAll('.qaItem.keepRight')
-               .remove();
-             touchLayer.selectAll('.qaItem.keepRight')
-               .remove();
+           var graph = _stack[_index].graph;
+
+           for (var i = 0; i < actions.length; i++) {
+             graph = actions[i](graph, t);
            }
-         }
 
-         // Enable the layer.  This shows the markers and transitions them to visible.
-         function layerOn() {
-           editOn();
+           return {
+             graph: graph,
+             annotation: annotation,
+             imageryUsed: _imageryUsed,
+             photoOverlaysUsed: _photoOverlaysUsed,
+             transform: context.projection.transform(),
+             selectedIDs: context.selectedIDs()
+           };
+         } // internal _perform with eased time
 
-           drawLayer
-             .style('opacity', 0)
-             .transition()
-             .duration(250)
-             .style('opacity', 1)
-             .on('end interrupt', () => dispatch.call('change'));
-         }
 
-         // Disable the layer.  This transitions the layer invisible and then hides the markers.
-         function layerOff() {
-           throttledRedraw.cancel();
-           drawLayer.interrupt();
-           touchLayer.selectAll('.qaItem.keepRight')
-             .remove();
-
-           drawLayer
-             .transition()
-             .duration(250)
-             .style('opacity', 0)
-             .on('end interrupt', () => {
-               editOff();
-               dispatch.call('change');
-             });
-         }
+         function _perform(args, t) {
+           var previous = _stack[_index].graph;
+           _stack = _stack.slice(0, _index + 1);
 
-         // Update the issue markers
-         function updateMarkers() {
-           if (!layerVisible || !_layerEnabled) return;
+           var actionResult = _act(args, t);
 
-           const service = getService();
-           const selectedID = context.selectedErrorID();
-           const data = (service ? service.getItems(projection) : []);
-           const getTransform = svgPointTransform(projection);
+           _stack.push(actionResult);
 
-           // Draw markers..
-           const markers = drawLayer.selectAll('.qaItem.keepRight')
-             .data(data, d => d.id);
+           _index++;
+           return change(previous);
+         } // internal _replace with eased time
 
-           // exit
-           markers.exit()
-             .remove();
 
-           // enter
-           const markersEnter = markers.enter()
-             .append('g')
-               .attr('class', d => `qaItem ${d.service} itemId-${d.id} itemType-${d.parentIssueType}`);
-
-           markersEnter
-             .append('ellipse')
-               .attr('cx', 0.5)
-               .attr('cy', 1)
-               .attr('rx', 6.5)
-               .attr('ry', 3)
-               .attr('class', 'stroke');
-
-           markersEnter
-             .append('path')
-               .call(markerPath, 'shadow');
-
-           markersEnter
-             .append('use')
-               .attr('class', 'qaItem-fill')
-               .attr('width', '20px')
-               .attr('height', '20px')
-               .attr('x', '-8px')
-               .attr('y', '-22px')
-               .attr('xlink:href', '#iD-icon-bolt');
+         function _replace(args, t) {
+           var previous = _stack[_index].graph; // assert(_index == _stack.length - 1)
 
-           // update
-           markers
-             .merge(markersEnter)
-             .sort(sortY)
-               .classed('selected', d => d.id === selectedID)
-               .attr('transform', getTransform);
+           var actionResult = _act(args, t);
 
+           _stack[_index] = actionResult;
+           return change(previous);
+         } // internal _overwrite with eased time
 
-           // Draw targets..
-           if (touchLayer.empty()) return;
-           const fillClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
 
-           const targets = touchLayer.selectAll('.qaItem.keepRight')
-             .data(data, d => d.id);
+         function _overwrite(args, t) {
+           var previous = _stack[_index].graph;
 
-           // exit
-           targets.exit()
-             .remove();
+           if (_index > 0) {
+             _index--;
 
-           // enter/update
-           targets.enter()
-             .append('rect')
-               .attr('width', '20px')
-               .attr('height', '20px')
-               .attr('x', '-8px')
-               .attr('y', '-22px')
-             .merge(targets)
-             .sort(sortY)
-               .attr('class', d => `qaItem ${d.service} target ${fillClass} itemId-${d.id}`)
-               .attr('transform', getTransform);
+             _stack.pop();
+           }
 
+           _stack = _stack.slice(0, _index + 1);
 
-           function sortY(a, b) {
-             return (a.id === selectedID) ? 1
-               : (b.id === selectedID) ? -1
-               : (a.severity === 'error' && b.severity !== 'error') ? 1
-               : (b.severity === 'error' && a.severity !== 'error') ? -1
-               : b.loc[1] - a.loc[1];
+           var actionResult = _act(args, t);
+
+           _stack.push(actionResult);
+
+           _index++;
+           return change(previous);
+         } // determine difference and dispatch a change event
+
+
+         function change(previous) {
+           var difference = coreDifference(previous, history.graph());
+
+           if (!_pausedGraph) {
+             dispatch$1.call('change', this, difference);
            }
+
+           return difference;
+         } // iD uses namespaced keys so multiple installations do not conflict
+
+
+         function getKey(n) {
+           return 'iD_' + window.location.origin + '_' + n;
          }
 
-         // Draw the keepRight layer and schedule loading issues and updating markers.
-         function drawKeepRight(selection) {
-           const service = getService();
+         var history = {
+           graph: function graph() {
+             return _stack[_index].graph;
+           },
+           tree: function tree() {
+             return _tree;
+           },
+           base: function base() {
+             return _stack[0].graph;
+           },
+           merge: function merge(entities
+           /*, extent*/
+           ) {
+             var stack = _stack.map(function (state) {
+               return state.graph;
+             });
 
-           const surface = context.surface();
-           if (surface && !surface.empty()) {
-             touchLayer = surface.selectAll('.data-layer.touch .layer-touch.markers');
-           }
+             _stack[0].graph.rebase(entities, stack, false);
 
-           drawLayer = selection.selectAll('.layer-keepRight')
-             .data(service ? [0] : []);
+             _tree.rebase(entities, false);
 
-           drawLayer.exit()
-             .remove();
+             dispatch$1.call('merge', this, entities);
+           },
+           perform: function perform() {
+             // complete any transition already in progress
+             select(document).interrupt('history.perform');
+             var transitionable = false;
+             var action0 = arguments[0];
 
-           drawLayer = drawLayer.enter()
-             .append('g')
-               .attr('class', 'layer-keepRight')
-               .style('display', _layerEnabled ? 'block' : 'none')
-             .merge(drawLayer);
+             if (arguments.length === 1 || arguments.length === 2 && typeof arguments[1] !== 'function') {
+               transitionable = !!action0.transitionable;
+             }
 
-           if (_layerEnabled) {
-             if (service && ~~context.map().zoom() >= minZoom) {
-               editOn();
-               service.loadIssues(projection);
-               updateMarkers();
+             if (transitionable) {
+               var origArguments = arguments;
+               select(document).transition('history.perform').duration(duration).ease(linear$1).tween('history.tween', function () {
+                 return function (t) {
+                   if (t < 1) _overwrite([action0], t);
+                 };
+               }).on('start', function () {
+                 _perform([action0], 0);
+               }).on('end interrupt', function () {
+                 _overwrite(origArguments, 1);
+               });
              } else {
-               editOff();
+               return _perform(arguments);
              }
-           }
-         }
+           },
+           replace: function replace() {
+             select(document).interrupt('history.perform');
+             return _replace(arguments, 1);
+           },
+           // Same as calling pop and then perform
+           overwrite: function overwrite() {
+             select(document).interrupt('history.perform');
+             return _overwrite(arguments, 1);
+           },
+           pop: function pop(n) {
+             select(document).interrupt('history.perform');
+             var previous = _stack[_index].graph;
 
-         // Toggles the layer on and off
-         drawKeepRight.enabled = function(val) {
-           if (!arguments.length) return _layerEnabled;
+             if (isNaN(+n) || +n < 0) {
+               n = 1;
+             }
 
-           _layerEnabled = val;
-           if (_layerEnabled) {
-             layerOn();
-           } else {
-             layerOff();
-             if (context.selectedErrorID()) {
-               context.enter(modeBrowse(context));
+             while (n-- > 0 && _index > 0) {
+               _index--;
+
+               _stack.pop();
              }
-           }
 
-           dispatch.call('change');
-           return this;
-         };
+             return change(previous);
+           },
+           // Back to the previous annotated state or _index = 0.
+           undo: function undo() {
+             select(document).interrupt('history.perform');
+             var previousStack = _stack[_index];
+             var previous = previousStack.graph;
 
-         drawKeepRight.supported = () => !!getService();
+             while (_index > 0) {
+               _index--;
+               if (_stack[_index].annotation) break;
+             }
 
-         return drawKeepRight;
-       }
+             dispatch$1.call('undone', this, _stack[_index], previousStack);
+             return change(previous);
+           },
+           // Forward to the next annotated state.
+           redo: function redo() {
+             select(document).interrupt('history.perform');
+             var previousStack = _stack[_index];
+             var previous = previousStack.graph;
+             var tryIndex = _index;
 
-       function svgGeolocate(projection) {
-           var layer = select(null);
-           var _position;
+             while (tryIndex < _stack.length - 1) {
+               tryIndex++;
 
+               if (_stack[tryIndex].annotation) {
+                 _index = tryIndex;
+                 dispatch$1.call('redone', this, _stack[_index], previousStack);
+                 break;
+               }
+             }
 
-           function init() {
-               if (svgGeolocate.initialized) return;  // run once
-               svgGeolocate.enabled = false;
-               svgGeolocate.initialized = true;
-           }
+             return change(previous);
+           },
+           pauseChangeDispatch: function pauseChangeDispatch() {
+             if (!_pausedGraph) {
+               _pausedGraph = _stack[_index].graph;
+             }
+           },
+           resumeChangeDispatch: function resumeChangeDispatch() {
+             if (_pausedGraph) {
+               var previous = _pausedGraph;
+               _pausedGraph = null;
+               return change(previous);
+             }
+           },
+           undoAnnotation: function undoAnnotation() {
+             var i = _index;
 
-           function showLayer() {
-               layer.style('display', 'block');
-           }
+             while (i >= 0) {
+               if (_stack[i].annotation) return _stack[i].annotation;
+               i--;
+             }
+           },
+           redoAnnotation: function redoAnnotation() {
+             var i = _index + 1;
 
+             while (i <= _stack.length - 1) {
+               if (_stack[i].annotation) return _stack[i].annotation;
+               i++;
+             }
+           },
+           // Returns the entities from the active graph with bounding boxes
+           // overlapping the given `extent`.
+           intersects: function intersects(extent) {
+             return _tree.intersects(extent, _stack[_index].graph);
+           },
+           difference: function difference() {
+             var base = _stack[0].graph;
+             var head = _stack[_index].graph;
+             return coreDifference(base, head);
+           },
+           changes: function changes(action) {
+             var base = _stack[0].graph;
+             var head = _stack[_index].graph;
 
-           function hideLayer() {
-               layer
-                   .transition()
-                   .duration(250)
-                   .style('opacity', 0);
-           }
+             if (action) {
+               head = action(head);
+             }
 
-           function layerOn() {
-               layer
-                   .style('opacity', 0)
-                   .transition()
-                   .duration(250)
-                   .style('opacity', 1);
+             var difference = coreDifference(base, head);
+             return {
+               modified: difference.modified(),
+               created: difference.created(),
+               deleted: difference.deleted()
+             };
+           },
+           hasChanges: function hasChanges() {
+             return this.difference().length() > 0;
+           },
+           imageryUsed: function imageryUsed(sources) {
+             if (sources) {
+               _imageryUsed = sources;
+               return history;
+             } else {
+               var s = new Set();
 
-           }
+               _stack.slice(1, _index + 1).forEach(function (state) {
+                 state.imageryUsed.forEach(function (source) {
+                   if (source !== 'Custom') {
+                     s.add(source);
+                   }
+                 });
+               });
 
-           function layerOff() {
-               layer.style('display', 'none');
-           }
+               return Array.from(s);
+             }
+           },
+           photoOverlaysUsed: function photoOverlaysUsed(sources) {
+             if (sources) {
+               _photoOverlaysUsed = sources;
+               return history;
+             } else {
+               var s = new Set();
 
-           function transform(d) {
-               return svgPointTransform(projection)(d);
-           }
+               _stack.slice(1, _index + 1).forEach(function (state) {
+                 if (state.photoOverlaysUsed && Array.isArray(state.photoOverlaysUsed)) {
+                   state.photoOverlaysUsed.forEach(function (photoOverlay) {
+                     s.add(photoOverlay);
+                   });
+                 }
+               });
+
+               return Array.from(s);
+             }
+           },
+           // save the current history state
+           checkpoint: function checkpoint(key) {
+             _checkpoints[key] = {
+               stack: _stack,
+               index: _index
+             };
+             return history;
+           },
+           // restore history state to a given checkpoint or reset completely
+           reset: function reset(key) {
+             if (key !== undefined && _checkpoints.hasOwnProperty(key)) {
+               _stack = _checkpoints[key].stack;
+               _index = _checkpoints[key].index;
+             } else {
+               _stack = [{
+                 graph: coreGraph()
+               }];
+               _index = 0;
+               _tree = coreTree(_stack[0].graph);
+               _checkpoints = {};
+             }
 
-           function accuracy(accuracy, loc) { // converts accuracy to pixels...
-               var degreesRadius = geoMetersToLat(accuracy),
-                   tangentLoc = [loc[0], loc[1] + degreesRadius],
-                   projectedTangent = projection(tangentLoc),
-                   projectedLoc = projection([loc[0], loc[1]]);
+             dispatch$1.call('reset');
+             dispatch$1.call('change');
+             return history;
+           },
+           // `toIntroGraph()` is used to export the intro graph used by the walkthrough.
+           //
+           // To use it:
+           //  1. Start the walkthrough.
+           //  2. Get to a "free editing" tutorial step
+           //  3. Make your edits to the walkthrough map
+           //  4. In your browser dev console run:
+           //        `id.history().toIntroGraph()`
+           //  5. This outputs stringified JSON to the browser console
+           //  6. Copy it to `data/intro_graph.json` and prettify it in your code editor
+           toIntroGraph: function toIntroGraph() {
+             var nextID = {
+               n: 0,
+               r: 0,
+               w: 0
+             };
+             var permIDs = {};
+             var graph = this.graph();
+             var baseEntities = {}; // clone base entities..
 
-               // southern most point will have higher pixel value...
-              return Math.round(projectedLoc[1] - projectedTangent[1]).toString();
-           }
+             Object.values(graph.base().entities).forEach(function (entity) {
+               var copy = copyIntroEntity(entity);
+               baseEntities[copy.id] = copy;
+             }); // replace base entities with head entities..
 
-           function update() {
-               var geolocation = { loc: [_position.coords.longitude, _position.coords.latitude] };
+             Object.keys(graph.entities).forEach(function (id) {
+               var entity = graph.entities[id];
 
-               var groups = layer.selectAll('.geolocations').selectAll('.geolocation')
-                   .data([geolocation]);
+               if (entity) {
+                 var copy = copyIntroEntity(entity);
+                 baseEntities[copy.id] = copy;
+               } else {
+                 delete baseEntities[id];
+               }
+             }); // swap temporary for permanent ids..
 
-               groups.exit()
-                   .remove();
+             Object.values(baseEntities).forEach(function (entity) {
+               if (Array.isArray(entity.nodes)) {
+                 entity.nodes = entity.nodes.map(function (node) {
+                   return permIDs[node] || node;
+                 });
+               }
 
-               var pointsEnter = groups.enter()
-                   .append('g')
-                   .attr('class', 'geolocation');
+               if (Array.isArray(entity.members)) {
+                 entity.members = entity.members.map(function (member) {
+                   member.id = permIDs[member.id] || member.id;
+                   return member;
+                 });
+               }
+             });
+             return JSON.stringify({
+               dataIntroGraph: baseEntities
+             });
 
-               pointsEnter
-                   .append('circle')
-                   .attr('class', 'geolocate-radius')
-                   .attr('dx', '0')
-                   .attr('dy', '0')
-                   .attr('fill', 'rgb(15,128,225)')
-                   .attr('fill-opacity', '0.3')
-                   .attr('r', '0');
+             function copyIntroEntity(source) {
+               var copy = utilObjectOmit(source, ['type', 'user', 'v', 'version', 'visible']); // Note: the copy is no longer an osmEntity, so it might not have `tags`
 
-               pointsEnter
-                   .append('circle')
-                   .attr('dx', '0')
-                   .attr('dy', '0')
-                   .attr('fill', 'rgb(15,128,225)')
-                   .attr('stroke', 'white')
-                   .attr('stroke-width', '1.5')
-                   .attr('r', '6');
+               if (copy.tags && !Object.keys(copy.tags)) {
+                 delete copy.tags;
+               }
 
-               groups.merge(pointsEnter)
-                   .attr('transform', transform);
+               if (Array.isArray(copy.loc)) {
+                 copy.loc[0] = +copy.loc[0].toFixed(6);
+                 copy.loc[1] = +copy.loc[1].toFixed(6);
+               }
 
-               layer.select('.geolocate-radius').attr('r', accuracy(_position.coords.accuracy, geolocation.loc));
-           }
+               var match = source.id.match(/([nrw])-\d*/); // temporary id
 
-           function drawLocation(selection) {
-               var enabled = svgGeolocate.enabled;
+               if (match !== null) {
+                 var nrw = match[1];
+                 var permID;
 
-               layer = selection.selectAll('.layer-geolocate')
-                   .data([0]);
+                 do {
+                   permID = nrw + ++nextID[nrw];
+                 } while (baseEntities.hasOwnProperty(permID));
 
-               layer.exit()
-                   .remove();
+                 copy.id = permIDs[source.id] = permID;
+               }
 
-               var layerEnter = layer.enter()
-                   .append('g')
-                   .attr('class', 'layer-geolocate')
-                   .style('display', enabled ? 'block' : 'none');
+               return copy;
+             }
+           },
+           toJSON: function toJSON() {
+             if (!this.hasChanges()) return;
+             var allEntities = {};
+             var baseEntities = {};
+             var base = _stack[0];
 
-               layerEnter
-                   .append('g')
-                   .attr('class', 'geolocations');
+             var s = _stack.map(function (i) {
+               var modified = [];
+               var deleted = [];
+               Object.keys(i.graph.entities).forEach(function (id) {
+                 var entity = i.graph.entities[id];
 
-               layer = layerEnter
-                   .merge(layer);
+                 if (entity) {
+                   var key = osmEntity.key(entity);
+                   allEntities[key] = entity;
+                   modified.push(key);
+                 } else {
+                   deleted.push(id);
+                 } // make sure that the originals of changed or deleted entities get merged
+                 // into the base of the _stack after restoring the data from JSON.
 
-               if (enabled) {
-                   update();
-               } else {
-                   layerOff();
-               }
-           }
 
-           drawLocation.enabled = function (position, enabled) {
-               if (!arguments.length) return svgGeolocate.enabled;
-               _position = position;
-               svgGeolocate.enabled = enabled;
-               if (svgGeolocate.enabled) {
-                   showLayer();
-                   layerOn();
-               } else {
-                   hideLayer();
-               }
-               return this;
-           };
+                 if (id in base.graph.entities) {
+                   baseEntities[id] = base.graph.entities[id];
+                 }
+
+                 if (entity && entity.nodes) {
+                   // get originals of pre-existing child nodes
+                   entity.nodes.forEach(function (nodeID) {
+                     if (nodeID in base.graph.entities) {
+                       baseEntities[nodeID] = base.graph.entities[nodeID];
+                     }
+                   });
+                 } // get originals of parent entities too
+
+
+                 var baseParents = base.graph._parentWays[id];
+
+                 if (baseParents) {
+                   baseParents.forEach(function (parentID) {
+                     if (parentID in base.graph.entities) {
+                       baseEntities[parentID] = base.graph.entities[parentID];
+                     }
+                   });
+                 }
+               });
+               var x = {};
+               if (modified.length) x.modified = modified;
+               if (deleted.length) x.deleted = deleted;
+               if (i.imageryUsed) x.imageryUsed = i.imageryUsed;
+               if (i.photoOverlaysUsed) x.photoOverlaysUsed = i.photoOverlaysUsed;
+               if (i.annotation) x.annotation = i.annotation;
+               if (i.transform) x.transform = i.transform;
+               if (i.selectedIDs) x.selectedIDs = i.selectedIDs;
+               return x;
+             });
+
+             return JSON.stringify({
+               version: 3,
+               entities: Object.values(allEntities),
+               baseEntities: Object.values(baseEntities),
+               stack: s,
+               nextIDs: osmEntity.id.next,
+               index: _index,
+               // note the time the changes were saved
+               timestamp: new Date().getTime()
+             });
+           },
+           fromJSON: function fromJSON(json, loadChildNodes) {
+             var h = JSON.parse(json);
+             var loadComplete = true;
+             osmEntity.id.next = h.nextIDs;
+             _index = h.index;
+
+             if (h.version === 2 || h.version === 3) {
+               var allEntities = {};
+               h.entities.forEach(function (entity) {
+                 allEntities[osmEntity.key(entity)] = osmEntity(entity);
+               });
+
+               if (h.version === 3) {
+                 // This merges originals for changed entities into the base of
+                 // the _stack even if the current _stack doesn't have them (for
+                 // example when iD has been restarted in a different region)
+                 var baseEntities = h.baseEntities.map(function (d) {
+                   return osmEntity(d);
+                 });
+
+                 var stack = _stack.map(function (state) {
+                   return state.graph;
+                 });
+
+                 _stack[0].graph.rebase(baseEntities, stack, true);
+
+                 _tree.rebase(baseEntities, true); // When we restore a modified way, we also need to fetch any missing
+                 // childnodes that would normally have been downloaded with it.. #2142
+
+
+                 if (loadChildNodes) {
+                   var osm = context.connection();
+                   var baseWays = baseEntities.filter(function (e) {
+                     return e.type === 'way';
+                   });
+                   var nodeIDs = baseWays.reduce(function (acc, way) {
+                     return utilArrayUnion(acc, way.nodes);
+                   }, []);
+                   var missing = nodeIDs.filter(function (n) {
+                     return !_stack[0].graph.hasEntity(n);
+                   });
+
+                   if (missing.length && osm) {
+                     loadComplete = false;
+                     context.map().redrawEnable(false);
+                     var loading = uiLoading(context).blocking(true);
+                     context.container().call(loading);
+
+                     var childNodesLoaded = function childNodesLoaded(err, result) {
+                       if (!err) {
+                         var visibleGroups = utilArrayGroupBy(result.data, 'visible');
+                         var visibles = visibleGroups["true"] || []; // alive nodes
 
-           init();
-           return drawLocation;
-       }
+                         var invisibles = visibleGroups["false"] || []; // deleted nodes
 
-       function svgLabels(projection, context) {
-           var path = d3_geoPath(projection);
-           var detected = utilDetect();
-           var baselineHack = (detected.ie ||
-               detected.browser.toLowerCase() === 'edge' ||
-               (detected.browser.toLowerCase() === 'firefox' && detected.version >= 70));
-           var _rdrawn = new RBush();
-           var _rskipped = new RBush();
-           var _textWidthCache = {};
-           var _entitybboxes = {};
-
-           // Listed from highest to lowest priority
-           var labelStack = [
-               ['line', 'aeroway', '*', 12],
-               ['line', 'highway', 'motorway', 12],
-               ['line', 'highway', 'trunk', 12],
-               ['line', 'highway', 'primary', 12],
-               ['line', 'highway', 'secondary', 12],
-               ['line', 'highway', 'tertiary', 12],
-               ['line', 'highway', '*', 12],
-               ['line', 'railway', '*', 12],
-               ['line', 'waterway', '*', 12],
-               ['area', 'aeroway', '*', 12],
-               ['area', 'amenity', '*', 12],
-               ['area', 'building', '*', 12],
-               ['area', 'historic', '*', 12],
-               ['area', 'leisure', '*', 12],
-               ['area', 'man_made', '*', 12],
-               ['area', 'natural', '*', 12],
-               ['area', 'shop', '*', 12],
-               ['area', 'tourism', '*', 12],
-               ['area', 'camp_site', '*', 12],
-               ['point', 'aeroway', '*', 10],
-               ['point', 'amenity', '*', 10],
-               ['point', 'building', '*', 10],
-               ['point', 'historic', '*', 10],
-               ['point', 'leisure', '*', 10],
-               ['point', 'man_made', '*', 10],
-               ['point', 'natural', '*', 10],
-               ['point', 'shop', '*', 10],
-               ['point', 'tourism', '*', 10],
-               ['point', 'camp_site', '*', 10],
-               ['line', 'name', '*', 12],
-               ['area', 'name', '*', 12],
-               ['point', 'name', '*', 10]
-           ];
-
-
-           function shouldSkipIcon(preset) {
-               var noIcons = ['building', 'landuse', 'natural'];
-               return noIcons.some(function(s) {
-                   return preset.id.indexOf(s) >= 0;
-               });
-           }
+                         if (visibles.length) {
+                           var visibleIDs = visibles.map(function (entity) {
+                             return entity.id;
+                           });
+
+                           var stack = _stack.map(function (state) {
+                             return state.graph;
+                           });
 
+                           missing = utilArrayDifference(missing, visibleIDs);
 
-           function get(array, prop) {
-               return function(d, i) { return array[i][prop]; };
-           }
+                           _stack[0].graph.rebase(visibles, stack, true);
 
+                           _tree.rebase(visibles, true);
+                         } // fetch older versions of nodes that were deleted..
 
-           function textWidth(text, size, elem) {
-               var c = _textWidthCache[size];
-               if (!c) c = _textWidthCache[size] = {};
 
-               if (c[text]) {
-                   return c[text];
+                         invisibles.forEach(function (entity) {
+                           osm.loadEntityVersion(entity.id, +entity.version - 1, childNodesLoaded);
+                         });
+                       }
 
-               } else if (elem) {
-                   c[text] = elem.getComputedTextLength();
-                   return c[text];
+                       if (err || !missing.length) {
+                         loading.close();
+                         context.map().redrawEnable(true);
+                         dispatch$1.call('change');
+                         dispatch$1.call('restore', this);
+                       }
+                     };
 
-               } else {
-                   var str = encodeURIComponent(text).match(/%[CDEFcdef]/g);
-                   if (str === null) {
-                       return size / 3 * 2 * text.length;
-                   } else {
-                       return size / 3 * (2 * text.length + str.length);
+                     osm.loadMultiple(missing, childNodesLoaded);
                    }
+                 }
                }
-           }
 
+               _stack = h.stack.map(function (d) {
+                 var entities = {},
+                     entity;
 
-           function drawLinePaths(selection, entities, filter, classes, labels) {
-               var paths = selection.selectAll('path')
-                   .filter(filter)
-                   .data(entities, osmEntity.key);
-
-               // exit
-               paths.exit()
-                   .remove();
-
-               // enter/update
-               paths.enter()
-                   .append('path')
-                   .style('stroke-width', get(labels, 'font-size'))
-                   .attr('id', function(d) { return 'ideditor-labelpath-' + d.id; })
-                   .attr('class', classes)
-                   .merge(paths)
-                   .attr('d', get(labels, 'lineString'));
-           }
-
-
-           function drawLineLabels(selection, entities, filter, classes, labels) {
-               var texts = selection.selectAll('text.' + classes)
-                   .filter(filter)
-                   .data(entities, osmEntity.key);
-
-               // exit
-               texts.exit()
-                   .remove();
-
-               // enter
-               texts.enter()
-                   .append('text')
-                   .attr('class', function(d, i) { return classes + ' ' + labels[i].classes + ' ' + d.id; })
-                   .attr('dy', baselineHack ? '0.35em' : null)
-                   .append('textPath')
-                   .attr('class', 'textpath');
-
-               // update
-               selection.selectAll('text.' + classes).selectAll('.textpath')
-                   .filter(filter)
-                   .data(entities, osmEntity.key)
-                   .attr('startOffset', '50%')
-                   .attr('xlink:href', function(d) { return '#ideditor-labelpath-' + d.id; })
-                   .text(utilDisplayNameForPath);
-           }
-
-
-           function drawPointLabels(selection, entities, filter, classes, labels) {
-               var texts = selection.selectAll('text.' + classes)
-                   .filter(filter)
-                   .data(entities, osmEntity.key);
-
-               // exit
-               texts.exit()
-                   .remove();
-
-               // enter/update
-               texts.enter()
-                   .append('text')
-                   .attr('class', function(d, i) {
-                       return classes + ' ' + labels[i].classes + ' ' + d.id;
-                   })
-                   .merge(texts)
-                   .attr('x', get(labels, 'x'))
-                   .attr('y', get(labels, 'y'))
-                   .style('text-anchor', get(labels, 'textAnchor'))
-                   .text(utilDisplayName)
-                   .each(function(d, i) {
-                       textWidth(utilDisplayName(d), labels[i].height, this);
+                 if (d.modified) {
+                   d.modified.forEach(function (key) {
+                     entity = allEntities[key];
+                     entities[entity.id] = entity;
                    });
-           }
+                 }
 
+                 if (d.deleted) {
+                   d.deleted.forEach(function (id) {
+                     entities[id] = undefined;
+                   });
+                 }
 
-           function drawAreaLabels(selection, entities, filter, classes, labels) {
-               entities = entities.filter(hasText);
-               labels = labels.filter(hasText);
-               drawPointLabels(selection, entities, filter, classes, labels);
+                 return {
+                   graph: coreGraph(_stack[0].graph).load(entities),
+                   annotation: d.annotation,
+                   imageryUsed: d.imageryUsed,
+                   photoOverlaysUsed: d.photoOverlaysUsed,
+                   transform: d.transform,
+                   selectedIDs: d.selectedIDs
+                 };
+               });
+             } else {
+               // original version
+               _stack = h.stack.map(function (d) {
+                 var entities = {};
 
-               function hasText(d, i) {
-                   return labels[i].hasOwnProperty('x') && labels[i].hasOwnProperty('y');
-               }
-           }
+                 for (var i in d.entities) {
+                   var entity = d.entities[i];
+                   entities[i] = entity === 'undefined' ? undefined : osmEntity(entity);
+                 }
 
+                 d.graph = coreGraph(_stack[0].graph).load(entities);
+                 return d;
+               });
+             }
 
-           function drawAreaIcons(selection, entities, filter, classes, labels) {
-               var icons = selection.selectAll('use.' + classes)
-                   .filter(filter)
-                   .data(entities, osmEntity.key);
+             var transform = _stack[_index].transform;
 
-               // exit
-               icons.exit()
-                   .remove();
+             if (transform) {
+               context.map().transformEase(transform, 0); // 0 = immediate, no easing
+             }
 
-               // enter/update
-               icons.enter()
-                   .append('use')
-                   .attr('class', 'icon ' + classes)
-                   .attr('width', '17px')
-                   .attr('height', '17px')
-                   .merge(icons)
-                   .attr('transform', get(labels, 'transform'))
-                   .attr('xlink:href', function(d) {
-                       var preset = _mainPresetIndex.match(d, context.graph());
-                       var picon = preset && preset.icon;
+             if (loadComplete) {
+               dispatch$1.call('change');
+               dispatch$1.call('restore', this);
+             }
 
-                       if (!picon) {
-                           return '';
-                       } else {
-                           var isMaki = /^maki-/.test(picon);
-                           return '#' + picon + (isMaki ? '-15' : '');
-                       }
-                   });
-           }
+             return history;
+           },
+           lock: function lock() {
+             return _lock.lock();
+           },
+           unlock: function unlock() {
+             _lock.unlock();
+           },
+           save: function save() {
+             if (_lock.locked() && // don't overwrite existing, unresolved changes
+             !_hasUnresolvedRestorableChanges) {
+               corePreferences(getKey('saved_history'), history.toJSON() || null);
+             }
 
+             return history;
+           },
+           // delete the history version saved in localStorage
+           clearSaved: function clearSaved() {
+             context.debouncedSave.cancel();
 
-           function drawCollisionBoxes(selection, rtree, which) {
-               var classes = 'debug ' + which + ' ' + (which === 'debug-skipped' ? 'orange' : 'yellow');
+             if (_lock.locked()) {
+               _hasUnresolvedRestorableChanges = false;
+               corePreferences(getKey('saved_history'), null); // clear the changeset metadata associated with the saved history
 
-               var gj = [];
-               if (context.getDebug('collision')) {
-                   gj = rtree.all().map(function(d) {
-                       return { type: 'Polygon', coordinates: [[
-                           [d.minX, d.minY],
-                           [d.maxX, d.minY],
-                           [d.maxX, d.maxY],
-                           [d.minX, d.maxY],
-                           [d.minX, d.minY]
-                       ]]};
-                   });
-               }
+               corePreferences('comment', null);
+               corePreferences('hashtags', null);
+               corePreferences('source', null);
+             }
 
-               var boxes = selection.selectAll('.' + which)
-                   .data(gj);
+             return history;
+           },
+           savedHistoryJSON: function savedHistoryJSON() {
+             return corePreferences(getKey('saved_history'));
+           },
+           hasRestorableChanges: function hasRestorableChanges() {
+             return _hasUnresolvedRestorableChanges;
+           },
+           // load history from a version stored in localStorage
+           restore: function restore() {
+             if (_lock.locked()) {
+               _hasUnresolvedRestorableChanges = false;
+               var json = this.savedHistoryJSON();
+               if (json) history.fromJSON(json, true);
+             }
+           },
+           _getKey: getKey
+         };
+         history.reset();
+         return utilRebind(history, dispatch$1, 'on');
+       }
 
-               // exit
-               boxes.exit()
-                   .remove();
+       /**
+        * Look for roads that can be connected to other roads with a short extension
+        */
 
-               // enter/update
-               boxes.enter()
-                   .append('path')
-                   .attr('class', classes)
-                   .merge(boxes)
-                   .attr('d', d3_geoPath());
-           }
+       function validationAlmostJunction(context) {
+         var type = 'almost_junction';
+         var EXTEND_TH_METERS = 5;
+         var WELD_TH_METERS = 0.75; // Comes from considering bounding case of parallel ways
 
+         var CLOSE_NODE_TH = EXTEND_TH_METERS - WELD_TH_METERS; // Comes from considering bounding case of perpendicular ways
 
-           function drawLabels(selection, graph, entities, filter, dimensions, fullRedraw) {
-               var wireframe = context.surface().classed('fill-wireframe');
-               var zoom = geoScaleToZoom(projection.scale());
+         var SIG_ANGLE_TH = Math.atan(WELD_TH_METERS / EXTEND_TH_METERS);
 
-               var labelable = [];
-               var renderNodeAs = {};
-               var i, j, k, entity, geometry;
+         function isHighway(entity) {
+           return entity.type === 'way' && osmRoutableHighwayTagValues[entity.tags.highway];
+         }
 
-               for (i = 0; i < labelStack.length; i++) {
-                   labelable.push([]);
-               }
+         function isTaggedAsNotContinuing(node) {
+           return node.tags.noexit === 'yes' || node.tags.amenity === 'parking_entrance' || node.tags.entrance && node.tags.entrance !== 'no';
+         }
 
-               if (fullRedraw) {
-                   _rdrawn.clear();
-                   _rskipped.clear();
-                   _entitybboxes = {};
+         var validation = function checkAlmostJunction(entity, graph) {
+           if (!isHighway(entity)) return [];
+           if (entity.isDegenerate()) return [];
+           var tree = context.history().tree();
+           var extendableNodeInfos = findConnectableEndNodesByExtension(entity);
+           var issues = [];
+           extendableNodeInfos.forEach(function (extendableNodeInfo) {
+             issues.push(new validationIssue({
+               type: type,
+               subtype: 'highway-highway',
+               severity: 'warning',
+               message: function message(context) {
+                 var entity1 = context.hasEntity(this.entityIds[0]);
 
-               } else {
-                   for (i = 0; i < entities.length; i++) {
-                       entity = entities[i];
-                       var toRemove = []
-                           .concat(_entitybboxes[entity.id] || [])
-                           .concat(_entitybboxes[entity.id + 'I'] || []);
-
-                       for (j = 0; j < toRemove.length; j++) {
-                           _rdrawn.remove(toRemove[j]);
-                           _rskipped.remove(toRemove[j]);
-                       }
-                   }
-               }
+                 if (this.entityIds[0] === this.entityIds[2]) {
+                   return entity1 ? _t.html('issues.almost_junction.self.message', {
+                     feature: utilDisplayLabel(entity1, context.graph())
+                   }) : '';
+                 } else {
+                   var entity2 = context.hasEntity(this.entityIds[2]);
+                   return entity1 && entity2 ? _t.html('issues.almost_junction.message', {
+                     feature: utilDisplayLabel(entity1, context.graph()),
+                     feature2: utilDisplayLabel(entity2, context.graph())
+                   }) : '';
+                 }
+               },
+               reference: showReference,
+               entityIds: [entity.id, extendableNodeInfo.node.id, extendableNodeInfo.wid],
+               loc: extendableNodeInfo.node.loc,
+               hash: JSON.stringify(extendableNodeInfo.node.loc),
+               data: {
+                 midId: extendableNodeInfo.mid.id,
+                 edge: extendableNodeInfo.edge,
+                 cross_loc: extendableNodeInfo.cross_loc
+               },
+               dynamicFixes: makeFixes
+             }));
+           });
+           return issues;
 
-               // Loop through all the entities to do some preprocessing
-               for (i = 0; i < entities.length; i++) {
-                   entity = entities[i];
-                   geometry = entity.geometry(graph);
+           function makeFixes(context) {
+             var fixes = [new validationIssueFix({
+               icon: 'iD-icon-abutment',
+               title: _t.html('issues.fix.connect_features.title'),
+               onClick: function onClick(context) {
+                 var annotation = _t('issues.fix.connect_almost_junction.annotation');
 
-                   // Insert collision boxes around interesting points/vertices
-                   if (geometry === 'point' || (geometry === 'vertex' && isInterestingVertex(entity))) {
-                       var hasDirections = entity.directions(graph, projection).length;
-                       var markerPadding;
+                 var _this$issue$entityIds = _slicedToArray(this.issue.entityIds, 3),
+                     endNodeId = _this$issue$entityIds[1],
+                     crossWayId = _this$issue$entityIds[2];
 
-                       if (!wireframe && geometry === 'point' && !(zoom >= 18 && hasDirections)) {
-                           renderNodeAs[entity.id] = 'point';
-                           markerPadding = 20;   // extra y for marker height
-                       } else {
-                           renderNodeAs[entity.id] = 'vertex';
-                           markerPadding = 0;
-                       }
+                 var midNode = context.entity(this.issue.data.midId);
+                 var endNode = context.entity(endNodeId);
+                 var crossWay = context.entity(crossWayId); // When endpoints are close, just join if resulting small change in angle (#7201)
 
-                       var coord = projection(entity.loc);
-                       var nodePadding = 10;
-                       var bbox = {
-                           minX: coord[0] - nodePadding,
-                           minY: coord[1] - nodePadding - markerPadding,
-                           maxX: coord[0] + nodePadding,
-                           maxY: coord[1] + nodePadding
-                       };
+                 var nearEndNodes = findNearbyEndNodes(endNode, crossWay);
 
-                       doInsert(bbox, entity.id + 'P');
-                   }
+                 if (nearEndNodes.length > 0) {
+                   var collinear = findSmallJoinAngle(midNode, endNode, nearEndNodes);
 
-                   // From here on, treat vertices like points
-                   if (geometry === 'vertex') {
-                       geometry = 'point';
+                   if (collinear) {
+                     context.perform(actionMergeNodes([collinear.id, endNode.id], collinear.loc), annotation);
+                     return;
                    }
+                 }
 
-                   // Determine which entities are label-able
-                   var preset = geometry === 'area' && _mainPresetIndex.match(entity, graph);
-                   var icon = preset && !shouldSkipIcon(preset) && preset.icon;
-
-                   if (!icon && !utilDisplayName(entity))
-                       continue;
-
-                   for (k = 0; k < labelStack.length; k++) {
-                       var matchGeom = labelStack[k][0];
-                       var matchKey = labelStack[k][1];
-                       var matchVal = labelStack[k][2];
-                       var hasVal = entity.tags[matchKey];
+                 var targetEdge = this.issue.data.edge;
+                 var crossLoc = this.issue.data.cross_loc;
+                 var edgeNodes = [context.entity(targetEdge[0]), context.entity(targetEdge[1])];
+                 var closestNodeInfo = geoSphericalClosestNode(edgeNodes, crossLoc); // already a point nearby, just connect to that
 
-                       if (geometry === matchGeom && hasVal && (matchVal === '*' || matchVal === hasVal)) {
-                           labelable[k].push(entity);
-                           break;
-                       }
-                   }
+                 if (closestNodeInfo.distance < WELD_TH_METERS) {
+                   context.perform(actionMergeNodes([closestNodeInfo.node.id, endNode.id], closestNodeInfo.node.loc), annotation); // else add the end node to the edge way
+                 } else {
+                   context.perform(actionAddMidpoint({
+                     loc: crossLoc,
+                     edge: targetEdge
+                   }, endNode), annotation);
+                 }
                }
+             })];
+             var node = context.hasEntity(this.entityIds[1]);
 
-               var positions = {
-                   point: [],
-                   line: [],
-                   area: []
-               };
-
-               var labelled = {
-                   point: [],
-                   line: [],
-                   area: []
-               };
+             if (node && !node.hasInterestingTags()) {
+               // node has no descriptive tags, suggest noexit fix
+               fixes.push(new validationIssueFix({
+                 icon: 'maki-barrier',
+                 title: _t.html('issues.fix.tag_as_disconnected.title'),
+                 onClick: function onClick(context) {
+                   var nodeID = this.issue.entityIds[1];
+                   var tags = Object.assign({}, context.entity(nodeID).tags);
+                   tags.noexit = 'yes';
+                   context.perform(actionChangeTags(nodeID, tags), _t('issues.fix.tag_as_disconnected.annotation'));
+                 }
+               }));
+             }
 
-               // Try and find a valid label for labellable entities
-               for (k = 0; k < labelable.length; k++) {
-                   var fontSize = labelStack[k][3];
+             return fixes;
+           }
 
-                   for (i = 0; i < labelable[k].length; i++) {
-                       entity = labelable[k][i];
-                       geometry = entity.geometry(graph);
+           function showReference(selection) {
+             selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.almost_junction.highway-highway.reference'));
+           }
 
-                       var getName = (geometry === 'line') ? utilDisplayNameForPath : utilDisplayName;
-                       var name = getName(entity);
-                       var width = name && textWidth(name, fontSize);
-                       var p = null;
+           function isExtendableCandidate(node, way) {
+             // can not accurately test vertices on tiles not downloaded from osm - #5938
+             var osm = services.osm;
 
-                       if (geometry === 'point' || geometry === 'vertex') {
-                           // no point or vertex labels in wireframe mode
-                           // no vertex labels at low zooms (vertices have no icons)
-                           if (wireframe) continue;
-                           var renderAs = renderNodeAs[entity.id];
-                           if (renderAs === 'vertex' && zoom < 17) continue;
+             if (osm && !osm.isDataLoaded(node.loc)) {
+               return false;
+             }
 
-                           p = getPointLabel(entity, width, fontSize, renderAs);
+             if (isTaggedAsNotContinuing(node) || graph.parentWays(node).length !== 1) {
+               return false;
+             }
 
-                       } else if (geometry === 'line') {
-                           p = getLineLabel(entity, width, fontSize);
+             var occurrences = 0;
 
-                       } else if (geometry === 'area') {
-                           p = getAreaLabel(entity, width, fontSize);
-                       }
+             for (var index in way.nodes) {
+               if (way.nodes[index] === node.id) {
+                 occurrences += 1;
 
-                       if (p) {
-                           if (geometry === 'vertex') { geometry = 'point'; }  // treat vertex like point
-                           p.classes = geometry + ' tag-' + labelStack[k][1];
-                           positions[geometry].push(p);
-                           labelled[geometry].push(entity);
-                       }
-                   }
+                 if (occurrences > 1) {
+                   return false;
+                 }
                }
+             }
 
+             return true;
+           }
 
-               function isInterestingVertex(entity) {
-                   var selectedIDs = context.selectedIDs();
-
-                   return entity.hasInterestingTags() ||
-                       entity.isEndpoint(graph) ||
-                       entity.isConnected(graph) ||
-                       selectedIDs.indexOf(entity.id) !== -1 ||
-                       graph.parentWays(entity).some(function(parent) {
-                           return selectedIDs.indexOf(parent.id) !== -1;
-                       });
-               }
+           function findConnectableEndNodesByExtension(way) {
+             var results = [];
+             if (way.isClosed()) return results;
+             var testNodes;
+             var indices = [0, way.nodes.length - 1];
+             indices.forEach(function (nodeIndex) {
+               var nodeID = way.nodes[nodeIndex];
+               var node = graph.entity(nodeID);
+               if (!isExtendableCandidate(node, way)) return;
+               var connectionInfo = canConnectByExtend(way, nodeIndex);
+               if (!connectionInfo) return;
+               testNodes = graph.childNodes(way).slice(); // shallow copy
 
+               testNodes[nodeIndex] = testNodes[nodeIndex].move(connectionInfo.cross_loc); // don't flag issue if connecting the ways would cause self-intersection
 
-               function getPointLabel(entity, width, height, geometry) {
-                   var y = (geometry === 'point' ? -12 : 0);
-                   var pointOffsets = {
-                       ltr: [15, y, 'start'],
-                       rtl: [-15, y, 'end']
-                   };
+               if (geoHasSelfIntersections(testNodes, nodeID)) return;
+               results.push(connectionInfo);
+             });
+             return results;
+           }
 
-                   var textDirection = _mainLocalizer.textDirection();
+           function findNearbyEndNodes(node, way) {
+             return [way.nodes[0], way.nodes[way.nodes.length - 1]].map(function (d) {
+               return graph.entity(d);
+             }).filter(function (d) {
+               // Node cannot be near to itself, but other endnode of same way could be
+               return d.id !== node.id && geoSphericalDistance(node.loc, d.loc) <= CLOSE_NODE_TH;
+             });
+           }
 
-                   var coord = projection(entity.loc);
-                   var textPadding = 2;
-                   var offset = pointOffsets[textDirection];
-                   var p = {
-                       height: height,
-                       width: width,
-                       x: coord[0] + offset[0],
-                       y: coord[1] + offset[1],
-                       textAnchor: offset[2]
-                   };
+           function findSmallJoinAngle(midNode, tipNode, endNodes) {
+             // Both nodes could be close, so want to join whichever is closest to collinear
+             var joinTo;
+             var minAngle = Infinity; // Checks midNode -> tipNode -> endNode for collinearity
 
-                   // insert a collision box for the text label..
-                   var bbox;
-                   if (textDirection === 'rtl') {
-                       bbox = {
-                           minX: p.x - width - textPadding,
-                           minY: p.y - (height / 2) - textPadding,
-                           maxX: p.x + textPadding,
-                           maxY: p.y + (height / 2) + textPadding
-                       };
-                   } else {
-                       bbox = {
-                           minX: p.x - textPadding,
-                           minY: p.y - (height / 2) - textPadding,
-                           maxX: p.x + width + textPadding,
-                           maxY: p.y + (height / 2) + textPadding
-                       };
-                   }
+             endNodes.forEach(function (endNode) {
+               var a1 = geoAngle(midNode, tipNode, context.projection) + Math.PI;
+               var a2 = geoAngle(midNode, endNode, context.projection) + Math.PI;
+               var diff = Math.max(a1, a2) - Math.min(a1, a2);
 
-                   if (tryInsert([bbox], entity.id, true)) {
-                       return p;
-                   }
+               if (diff < minAngle) {
+                 joinTo = endNode;
+                 minAngle = diff;
                }
+             });
+             /* Threshold set by considering right angle triangle
+             based on node joining threshold and extension distance */
 
+             if (minAngle <= SIG_ANGLE_TH) return joinTo;
+             return null;
+           }
 
-               function getLineLabel(entity, width, height) {
-                   var viewport = geoExtent(context.projection.clipExtent()).polygon();
-                   var points = graph.childNodes(entity)
-                       .map(function(node) { return projection(node.loc); });
-                   var length = geoPathLength(points);
+           function hasTag(tags, key) {
+             return tags[key] !== undefined && tags[key] !== 'no';
+           }
 
-                   if (length < width + 20) return;
+           function canConnectWays(way, way2) {
+             // allow self-connections
+             if (way.id === way2.id) return true; // if one is bridge or tunnel, both must be bridge or tunnel
 
-                   // % along the line to attempt to place the label
-                   var lineOffsets = [50, 45, 55, 40, 60, 35, 65, 30, 70,
-                                      25, 75, 20, 80, 15, 95, 10, 90, 5, 95];
-                   var padding = 3;
+             if ((hasTag(way.tags, 'bridge') || hasTag(way2.tags, 'bridge')) && !(hasTag(way.tags, 'bridge') && hasTag(way2.tags, 'bridge'))) return false;
+             if ((hasTag(way.tags, 'tunnel') || hasTag(way2.tags, 'tunnel')) && !(hasTag(way.tags, 'tunnel') && hasTag(way2.tags, 'tunnel'))) return false; // must have equivalent layers and levels
 
-                   for (var i = 0; i < lineOffsets.length; i++) {
-                       var offset = lineOffsets[i];
-                       var middle = offset / 100 * length;
-                       var start = middle - width / 2;
+             var layer1 = way.tags.layer || '0',
+                 layer2 = way2.tags.layer || '0';
+             if (layer1 !== layer2) return false;
+             var level1 = way.tags.level || '0',
+                 level2 = way2.tags.level || '0';
+             if (level1 !== level2) return false;
+             return true;
+           }
 
-                       if (start < 0 || start + width > length) continue;
+           function canConnectByExtend(way, endNodeIdx) {
+             var tipNid = way.nodes[endNodeIdx]; // the 'tip' node for extension point
 
-                       // generate subpath and ignore paths that are invalid or don't cross viewport.
-                       var sub = subpath(points, start, start + width);
-                       if (!sub || !geoPolygonIntersectsPolygon(viewport, sub, true)) {
-                           continue;
-                       }
+             var midNid = endNodeIdx === 0 ? way.nodes[1] : way.nodes[way.nodes.length - 2]; // the other node of the edge
 
-                       var isReverse = reverse(sub);
-                       if (isReverse) {
-                           sub = sub.reverse();
-                       }
+             var tipNode = graph.entity(tipNid);
+             var midNode = graph.entity(midNid);
+             var lon = tipNode.loc[0];
+             var lat = tipNode.loc[1];
+             var lon_range = geoMetersToLon(EXTEND_TH_METERS, lat) / 2;
+             var lat_range = geoMetersToLat(EXTEND_TH_METERS) / 2;
+             var queryExtent = geoExtent([[lon - lon_range, lat - lat_range], [lon + lon_range, lat + lat_range]]); // first, extend the edge of [midNode -> tipNode] by EXTEND_TH_METERS and find the "extended tip" location
 
-                       var bboxes = [];
-                       var boxsize = (height + 2) / 2;
-
-                       for (var j = 0; j < sub.length - 1; j++) {
-                           var a = sub[j];
-                           var b = sub[j + 1];
-
-                           // split up the text into small collision boxes
-                           var num = Math.max(1, Math.floor(geoVecLength(a, b) / boxsize / 2));
-
-                           for (var box = 0; box < num; box++) {
-                               var p = geoVecInterp(a, b, box / num);
-                               var x0 = p[0] - boxsize - padding;
-                               var y0 = p[1] - boxsize - padding;
-                               var x1 = p[0] + boxsize + padding;
-                               var y1 = p[1] + boxsize + padding;
-
-                               bboxes.push({
-                                   minX: Math.min(x0, x1),
-                                   minY: Math.min(y0, y1),
-                                   maxX: Math.max(x0, x1),
-                                   maxY: Math.max(y0, y1)
-                               });
-                           }
-                       }
+             var edgeLen = geoSphericalDistance(midNode.loc, tipNode.loc);
+             var t = EXTEND_TH_METERS / edgeLen + 1.0;
+             var extTipLoc = geoVecInterp(midNode.loc, tipNode.loc, t); // then, check if the extension part [tipNode.loc -> extTipLoc] intersects any other ways
 
-                       if (tryInsert(bboxes, entity.id, false)) {   // accept this one
-                           return {
-                               'font-size': height + 2,
-                               lineString: lineString(sub),
-                               startOffset: offset + '%'
-                           };
-                       }
-                   }
+             var segmentInfos = tree.waySegments(queryExtent, graph);
 
-                   function reverse(p) {
-                       var angle = Math.atan2(p[1][1] - p[0][1], p[1][0] - p[0][0]);
-                       return !(p[0][0] < p[p.length - 1][0] && angle < Math.PI/2 && angle > -Math.PI/2);
-                   }
+             for (var i = 0; i < segmentInfos.length; i++) {
+               var segmentInfo = segmentInfos[i];
+               var way2 = graph.entity(segmentInfo.wayId);
+               if (!isHighway(way2)) continue;
+               if (!canConnectWays(way, way2)) continue;
+               var nAid = segmentInfo.nodes[0],
+                   nBid = segmentInfo.nodes[1];
+               if (nAid === tipNid || nBid === tipNid) continue;
+               var nA = graph.entity(nAid),
+                   nB = graph.entity(nBid);
+               var crossLoc = geoLineIntersection([tipNode.loc, extTipLoc], [nA.loc, nB.loc]);
 
-                   function lineString(points) {
-                       return 'M' + points.join('L');
-                   }
+               if (crossLoc) {
+                 return {
+                   mid: midNode,
+                   node: tipNode,
+                   wid: way2.id,
+                   edge: [nA.id, nB.id],
+                   cross_loc: crossLoc
+                 };
+               }
+             }
 
-                   function subpath(points, from, to) {
-                       var sofar = 0;
-                       var start, end, i0, i1;
-
-                       for (var i = 0; i < points.length - 1; i++) {
-                           var a = points[i];
-                           var b = points[i + 1];
-                           var current = geoVecLength(a, b);
-                           var portion;
-                           if (!start && sofar + current >= from) {
-                               portion = (from - sofar) / current;
-                               start = [
-                                   a[0] + portion * (b[0] - a[0]),
-                                   a[1] + portion * (b[1] - a[1])
-                               ];
-                               i0 = i + 1;
-                           }
-                           if (!end && sofar + current >= to) {
-                               portion = (to - sofar) / current;
-                               end = [
-                                   a[0] + portion * (b[0] - a[0]),
-                                   a[1] + portion * (b[1] - a[1])
-                               ];
-                               i1 = i + 1;
-                           }
-                           sofar += current;
-                       }
+             return null;
+           }
+         };
 
-                       var result = points.slice(i0, i1);
-                       result.unshift(start);
-                       result.push(end);
-                       return result;
-                   }
-               }
+         validation.type = type;
+         return validation;
+       }
 
+       function validationCloseNodes(context) {
+         var type = 'close_nodes';
+         var pointThresholdMeters = 0.2;
 
-               function getAreaLabel(entity, width, height) {
-                   var centroid = path.centroid(entity.asGeoJSON(graph, true));
-                   var extent = entity.extent(graph);
-                   var areaWidth = projection(extent[1])[0] - projection(extent[0])[0];
+         var validation = function validation(entity, graph) {
+           if (entity.type === 'node') {
+             return getIssuesForNode(entity);
+           } else if (entity.type === 'way') {
+             return getIssuesForWay(entity);
+           }
 
-                   if (isNaN(centroid[0]) || areaWidth < 20) return;
+           return [];
 
-                   var preset = _mainPresetIndex.match(entity, context.graph());
-                   var picon = preset && preset.icon;
-                   var iconSize = 17;
-                   var padding = 2;
-                   var p = {};
-
-                   if (picon) {  // icon and label..
-                       if (addIcon()) {
-                           addLabel(iconSize + padding);
-                           return p;
-                       }
-                   } else {   // label only..
-                       if (addLabel(0)) {
-                           return p;
-                       }
-                   }
+           function getIssuesForNode(node) {
+             var parentWays = graph.parentWays(node);
 
+             if (parentWays.length) {
+               return getIssuesForVertex(node, parentWays);
+             } else {
+               return getIssuesForDetachedPoint(node);
+             }
+           }
 
-                   function addIcon() {
-                       var iconX = centroid[0] - (iconSize / 2);
-                       var iconY = centroid[1] - (iconSize / 2);
-                       var bbox = {
-                           minX: iconX,
-                           minY: iconY,
-                           maxX: iconX + iconSize,
-                           maxY: iconY + iconSize
-                       };
+           function wayTypeFor(way) {
+             if (way.tags.boundary && way.tags.boundary !== 'no') return 'boundary';
+             if (way.tags.indoor && way.tags.indoor !== 'no') return 'indoor';
+             if (way.tags.building && way.tags.building !== 'no' || way.tags['building:part'] && way.tags['building:part'] !== 'no') return 'building';
+             if (osmPathHighwayTagValues[way.tags.highway]) return 'path';
+             var parentRelations = graph.parentRelations(way);
 
-                       if (tryInsert([bbox], entity.id + 'I', true)) {
-                           p.transform = 'translate(' + iconX + ',' + iconY + ')';
-                           return true;
-                       }
-                       return false;
-                   }
+             for (var i in parentRelations) {
+               var relation = parentRelations[i];
+               if (relation.tags.type === 'boundary') return 'boundary';
 
-                   function addLabel(yOffset) {
-                       if (width && areaWidth >= width + 20) {
-                           var labelX = centroid[0];
-                           var labelY = centroid[1] + yOffset;
-                           var bbox = {
-                               minX: labelX - (width / 2) - padding,
-                               minY: labelY - (height / 2) - padding,
-                               maxX: labelX + (width / 2) + padding,
-                               maxY: labelY + (height / 2) + padding
-                           };
-
-                           if (tryInsert([bbox], entity.id, true)) {
-                               p.x = labelX;
-                               p.y = labelY;
-                               p.textAnchor = 'middle';
-                               p.height = height;
-                               return true;
-                           }
-                       }
-                       return false;
-                   }
+               if (relation.isMultipolygon()) {
+                 if (relation.tags.indoor && relation.tags.indoor !== 'no') return 'indoor';
+                 if (relation.tags.building && relation.tags.building !== 'no' || relation.tags['building:part'] && relation.tags['building:part'] !== 'no') return 'building';
                }
+             }
 
+             return 'other';
+           }
 
-               // force insert a singular bounding box
-               // singular box only, no array, id better be unique
-               function doInsert(bbox, id) {
-                   bbox.id = id;
+           function shouldCheckWay(way) {
+             // don't flag issues where merging would create degenerate ways
+             if (way.nodes.length <= 2 || way.isClosed() && way.nodes.length <= 4) return false;
+             var bbox = way.extent(graph).bbox();
+             var hypotenuseMeters = geoSphericalDistance([bbox.minX, bbox.minY], [bbox.maxX, bbox.maxY]); // don't flag close nodes in very small ways
 
-                   var oldbox = _entitybboxes[id];
-                   if (oldbox) {
-                       _rdrawn.remove(oldbox);
-                   }
-                   _entitybboxes[id] = bbox;
-                   _rdrawn.insert(bbox);
-               }
+             if (hypotenuseMeters < 1.5) return false;
+             return true;
+           }
 
+           function getIssuesForWay(way) {
+             if (!shouldCheckWay(way)) return [];
+             var issues = [],
+                 nodes = graph.childNodes(way);
 
-               function tryInsert(bboxes, id, saveSkipped) {
-                   var skipped = false;
+             for (var i = 0; i < nodes.length - 1; i++) {
+               var node1 = nodes[i];
+               var node2 = nodes[i + 1];
+               var issue = getWayIssueIfAny(node1, node2, way);
+               if (issue) issues.push(issue);
+             }
 
-                   for (var i = 0; i < bboxes.length; i++) {
-                       var bbox = bboxes[i];
-                       bbox.id = id;
+             return issues;
+           }
 
-                       // Check that label is visible
-                       if (bbox.minX < 0 || bbox.minY < 0 || bbox.maxX > dimensions[0] || bbox.maxY > dimensions[1]) {
-                           skipped = true;
-                           break;
-                       }
-                       if (_rdrawn.collides(bbox)) {
-                           skipped = true;
-                           break;
-                       }
-                   }
+           function getIssuesForVertex(node, parentWays) {
+             var issues = [];
 
-                   _entitybboxes[id] = bboxes;
+             function checkForCloseness(node1, node2, way) {
+               var issue = getWayIssueIfAny(node1, node2, way);
+               if (issue) issues.push(issue);
+             }
 
-                   if (skipped) {
-                       if (saveSkipped) {
-                           _rskipped.load(bboxes);
-                       }
-                   } else {
-                       _rdrawn.load(bboxes);
+             for (var i = 0; i < parentWays.length; i++) {
+               var parentWay = parentWays[i];
+               if (!shouldCheckWay(parentWay)) continue;
+               var lastIndex = parentWay.nodes.length - 1;
+
+               for (var j = 0; j < parentWay.nodes.length; j++) {
+                 if (j !== 0) {
+                   if (parentWay.nodes[j - 1] === node.id) {
+                     checkForCloseness(node, graph.entity(parentWay.nodes[j]), parentWay);
                    }
+                 }
 
-                   return !skipped;
+                 if (j !== lastIndex) {
+                   if (parentWay.nodes[j + 1] === node.id) {
+                     checkForCloseness(graph.entity(parentWay.nodes[j]), node, parentWay);
+                   }
+                 }
                }
+             }
 
+             return issues;
+           }
 
-               var layer = selection.selectAll('.layer-osm.labels');
-               layer.selectAll('.labels-group')
-                   .data(['halo', 'label', 'debug'])
-                   .enter()
-                   .append('g')
-                   .attr('class', function(d) { return 'labels-group ' + d; });
-
-               var halo = layer.selectAll('.labels-group.halo');
-               var label = layer.selectAll('.labels-group.label');
-               var debug = layer.selectAll('.labels-group.debug');
-
-               // points
-               drawPointLabels(label, labelled.point, filter, 'pointlabel', positions.point);
-               drawPointLabels(halo, labelled.point, filter, 'pointlabel-halo', positions.point);
+           function thresholdMetersForWay(way) {
+             if (!shouldCheckWay(way)) return 0;
+             var wayType = wayTypeFor(way); // don't flag boundaries since they might be highly detailed and can't be easily verified
 
-               // lines
-               drawLinePaths(layer, labelled.line, filter, '', positions.line);
-               drawLineLabels(label, labelled.line, filter, 'linelabel', positions.line);
-               drawLineLabels(halo, labelled.line, filter, 'linelabel-halo', positions.line);
+             if (wayType === 'boundary') return 0; // expect some features to be mapped with higher levels of detail
 
-               // areas
-               drawAreaLabels(label, labelled.area, filter, 'arealabel', positions.area);
-               drawAreaLabels(halo, labelled.area, filter, 'arealabel-halo', positions.area);
-               drawAreaIcons(label, labelled.area, filter, 'areaicon', positions.area);
-               drawAreaIcons(halo, labelled.area, filter, 'areaicon-halo', positions.area);
+             if (wayType === 'indoor') return 0.01;
+             if (wayType === 'building') return 0.05;
+             if (wayType === 'path') return 0.1;
+             return 0.2;
+           }
 
-               // debug
-               drawCollisionBoxes(debug, _rskipped, 'debug-skipped');
-               drawCollisionBoxes(debug, _rdrawn, 'debug-drawn');
+           function getIssuesForDetachedPoint(node) {
+             var issues = [];
+             var lon = node.loc[0];
+             var lat = node.loc[1];
+             var lon_range = geoMetersToLon(pointThresholdMeters, lat) / 2;
+             var lat_range = geoMetersToLat(pointThresholdMeters) / 2;
+             var queryExtent = geoExtent([[lon - lon_range, lat - lat_range], [lon + lon_range, lat + lat_range]]);
+             var intersected = context.history().tree().intersects(queryExtent, graph);
 
-               layer.call(filterLabels);
-           }
+             for (var j = 0; j < intersected.length; j++) {
+               var nearby = intersected[j];
+               if (nearby.id === node.id) continue;
+               if (nearby.type !== 'node' || nearby.geometry(graph) !== 'point') continue;
 
+               if (nearby.loc === node.loc || geoSphericalDistance(node.loc, nearby.loc) < pointThresholdMeters) {
+                 // allow very close points if tags indicate the z-axis might vary
+                 var zAxisKeys = {
+                   layer: true,
+                   level: true,
+                   'addr:housenumber': true,
+                   'addr:unit': true
+                 };
+                 var zAxisDifferentiates = false;
 
-           function filterLabels(selection) {
-               var drawLayer = selection.selectAll('.layer-osm.labels');
-               var layers = drawLayer.selectAll('.labels-group.halo, .labels-group.label');
+                 for (var key in zAxisKeys) {
+                   var nodeValue = node.tags[key] || '0';
+                   var nearbyValue = nearby.tags[key] || '0';
 
-               layers.selectAll('.nolabel')
-                   .classed('nolabel', false);
+                   if (nodeValue !== nearbyValue) {
+                     zAxisDifferentiates = true;
+                     break;
+                   }
+                 }
 
-               var mouse = context.map().mouse();
-               var graph = context.graph();
-               var selectedIDs = context.selectedIDs();
-               var ids = [];
-               var pad, bbox;
-
-               // hide labels near the mouse
-               if (mouse) {
-                   pad = 20;
-                   bbox = { minX: mouse[0] - pad, minY: mouse[1] - pad, maxX: mouse[0] + pad, maxY: mouse[1] + pad };
-                   var nearMouse = _rdrawn.search(bbox).map(function(entity) { return entity.id; });
-                   ids.push.apply(ids, nearMouse);
-               }
-
-               // hide labels on selected nodes (they look weird when dragging / haloed)
-               for (var i = 0; i < selectedIDs.length; i++) {
-                   var entity = graph.hasEntity(selectedIDs[i]);
-                   if (entity && entity.type === 'node') {
-                       ids.push(selectedIDs[i]);
+                 if (zAxisDifferentiates) continue;
+                 issues.push(new validationIssue({
+                   type: type,
+                   subtype: 'detached',
+                   severity: 'warning',
+                   message: function message(context) {
+                     var entity = context.hasEntity(this.entityIds[0]),
+                         entity2 = context.hasEntity(this.entityIds[1]);
+                     return entity && entity2 ? _t.html('issues.close_nodes.detached.message', {
+                       feature: utilDisplayLabel(entity, context.graph()),
+                       feature2: utilDisplayLabel(entity2, context.graph())
+                     }) : '';
+                   },
+                   reference: showReference,
+                   entityIds: [node.id, nearby.id],
+                   dynamicFixes: function dynamicFixes() {
+                     return [new validationIssueFix({
+                       icon: 'iD-operation-disconnect',
+                       title: _t.html('issues.fix.move_points_apart.title')
+                     }), new validationIssueFix({
+                       icon: 'iD-icon-layers',
+                       title: _t.html('issues.fix.use_different_layers_or_levels.title')
+                     })];
                    }
+                 }));
                }
+             }
 
-               layers.selectAll(utilEntitySelector(ids))
-                   .classed('nolabel', true);
+             return issues;
 
+             function showReference(selection) {
+               var referenceText = _t('issues.close_nodes.detached.reference');
+               selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(referenceText);
+             }
+           }
 
-               // draw the mouse bbox if debugging is on..
-               var debug = selection.selectAll('.labels-group.debug');
-               var gj = [];
-               if (context.getDebug('collision')) {
-                   gj = bbox ? [{
-                       type: 'Polygon',
-                       coordinates: [[
-                           [bbox.minX, bbox.minY],
-                           [bbox.maxX, bbox.minY],
-                           [bbox.maxX, bbox.maxY],
-                           [bbox.minX, bbox.maxY],
-                           [bbox.minX, bbox.minY]
-                       ]]
-                   }] : [];
-               }
+           function getWayIssueIfAny(node1, node2, way) {
+             if (node1.id === node2.id || node1.hasInterestingTags() && node2.hasInterestingTags()) {
+               return null;
+             }
 
-               var box = debug.selectAll('.debug-mouse')
-                   .data(gj);
+             if (node1.loc !== node2.loc) {
+               var parentWays1 = graph.parentWays(node1);
+               var parentWays2 = new Set(graph.parentWays(node2));
+               var sharedWays = parentWays1.filter(function (parentWay) {
+                 return parentWays2.has(parentWay);
+               });
+               var thresholds = sharedWays.map(function (parentWay) {
+                 return thresholdMetersForWay(parentWay);
+               });
+               var threshold = Math.min.apply(Math, _toConsumableArray(thresholds));
+               var distance = geoSphericalDistance(node1.loc, node2.loc);
+               if (distance > threshold) return null;
+             }
 
-               // exit
-               box.exit()
-                   .remove();
+             return new validationIssue({
+               type: type,
+               subtype: 'vertices',
+               severity: 'warning',
+               message: function message(context) {
+                 var entity = context.hasEntity(this.entityIds[0]);
+                 return entity ? _t.html('issues.close_nodes.message', {
+                   way: utilDisplayLabel(entity, context.graph())
+                 }) : '';
+               },
+               reference: showReference,
+               entityIds: [way.id, node1.id, node2.id],
+               loc: node1.loc,
+               dynamicFixes: function dynamicFixes() {
+                 return [new validationIssueFix({
+                   icon: 'iD-icon-plus',
+                   title: _t.html('issues.fix.merge_points.title'),
+                   onClick: function onClick(context) {
+                     var entityIds = this.issue.entityIds;
+                     var action = actionMergeNodes([entityIds[1], entityIds[2]]);
+                     context.perform(action, _t('issues.fix.merge_close_vertices.annotation'));
+                   }
+                 }), new validationIssueFix({
+                   icon: 'iD-operation-disconnect',
+                   title: _t.html('issues.fix.move_points_apart.title')
+                 })];
+               }
+             });
 
-               // enter/update
-               box.enter()
-                   .append('path')
-                   .attr('class', 'debug debug-mouse yellow')
-                   .merge(box)
-                   .attr('d', d3_geoPath());
+             function showReference(selection) {
+               var referenceText = _t('issues.close_nodes.reference');
+               selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(referenceText);
+             }
            }
+         };
 
+         validation.type = type;
+         return validation;
+       }
 
-           var throttleFilterLabels = throttle(filterLabels, 100);
+       function validationCrossingWays(context) {
+         var type = 'crossing_ways'; // returns the way or its parent relation, whichever has a useful feature type
 
+         function getFeatureWithFeatureTypeTagsForWay(way, graph) {
+           if (getFeatureType(way, graph) === null) {
+             // if the way doesn't match a feature type, check its parent relations
+             var parentRels = graph.parentRelations(way);
 
-           drawLabels.observe = function(selection) {
-               var listener = function() { throttleFilterLabels(selection); };
-               selection.on('mousemove.hidelabels', listener);
-               context.on('enter.hidelabels', listener);
-           };
+             for (var i = 0; i < parentRels.length; i++) {
+               var rel = parentRels[i];
 
+               if (getFeatureType(rel, graph) !== null) {
+                 return rel;
+               }
+             }
+           }
 
-           drawLabels.off = function(selection) {
-               throttleFilterLabels.cancel();
-               selection.on('mousemove.hidelabels', null);
-               context.on('enter.hidelabels', null);
-           };
+           return way;
+         }
 
+         function hasTag(tags, key) {
+           return tags[key] !== undefined && tags[key] !== 'no';
+         }
 
-           return drawLabels;
-       }
+         function taggedAsIndoor(tags) {
+           return hasTag(tags, 'indoor') || hasTag(tags, 'level') || tags.highway === 'corridor';
+         }
 
-       let _layerEnabled$1 = false;
-       let _qaService$1;
+         function allowsBridge(featureType) {
+           return featureType === 'highway' || featureType === 'railway' || featureType === 'waterway';
+         }
 
-       function svgImproveOSM(projection, context, dispatch) {
-         const throttledRedraw = throttle(() => dispatch.call('change'), 1000);
-         const minZoom = 12;
+         function allowsTunnel(featureType) {
+           return featureType === 'highway' || featureType === 'railway' || featureType === 'waterway';
+         } // discard
 
-         let touchLayer = select(null);
-         let drawLayer = select(null);
-         let layerVisible = false;
 
-         function markerPath(selection, klass) {
-           selection
-             .attr('class', klass)
-             .attr('transform', 'translate(-10, -28)')
-             .attr('points', '16,3 4,3 1,6 1,17 4,20 7,20 10,27 13,20 16,20 19,17.033 19,6');
-         }
+         var ignoredBuildings = {
+           demolished: true,
+           dismantled: true,
+           proposed: true,
+           razed: true
+         };
 
-         // Loosely-coupled improveOSM service for fetching issues
-         function getService() {
-           if (services.improveOSM && !_qaService$1) {
-             _qaService$1 = services.improveOSM;
-             _qaService$1.on('loaded', throttledRedraw);
-           } else if (!services.improveOSM && _qaService$1) {
-             _qaService$1 = null;
-           }
+         function getFeatureType(entity, graph) {
+           var geometry = entity.geometry(graph);
+           if (geometry !== 'line' && geometry !== 'area') return null;
+           var tags = entity.tags;
+           if (hasTag(tags, 'building') && !ignoredBuildings[tags.building]) return 'building';
+           if (hasTag(tags, 'highway') && osmRoutableHighwayTagValues[tags.highway]) return 'highway'; // don't check railway or waterway areas
 
-           return _qaService$1;
+           if (geometry !== 'line') return null;
+           if (hasTag(tags, 'railway') && osmRailwayTrackTagValues[tags.railway]) return 'railway';
+           if (hasTag(tags, 'waterway') && osmFlowingWaterwayTagValues[tags.waterway]) return 'waterway';
+           return null;
          }
 
-         // Show the markers
-         function editOn() {
-           if (!layerVisible) {
-             layerVisible = true;
-             drawLayer
-               .style('display', 'block');
-           }
-         }
+         function isLegitCrossing(tags1, featureType1, tags2, featureType2) {
+           // assume 0 by default
+           var level1 = tags1.level || '0';
+           var level2 = tags2.level || '0';
 
-         // Immediately remove the markers and their touch targets
-         function editOff() {
-           if (layerVisible) {
-             layerVisible = false;
-             drawLayer
-               .style('display', 'none');
-             drawLayer.selectAll('.qaItem.improveOSM')
-               .remove();
-             touchLayer.selectAll('.qaItem.improveOSM')
-               .remove();
-           }
-         }
+           if (taggedAsIndoor(tags1) && taggedAsIndoor(tags2) && level1 !== level2) {
+             // assume features don't interact if they're indoor on different levels
+             return true;
+           } // assume 0 by default; don't use way.layer() since we account for structures here
 
-         // Enable the layer.  This shows the markers and transitions them to visible.
-         function layerOn() {
-           editOn();
 
-           drawLayer
-             .style('opacity', 0)
-             .transition()
-             .duration(250)
-             .style('opacity', 1)
-             .on('end interrupt', () => dispatch.call('change'));
-         }
+           var layer1 = tags1.layer || '0';
+           var layer2 = tags2.layer || '0';
 
-         // Disable the layer.  This transitions the layer invisible and then hides the markers.
-         function layerOff() {
-           throttledRedraw.cancel();
-           drawLayer.interrupt();
-           touchLayer.selectAll('.qaItem.improveOSM')
-             .remove();
-
-           drawLayer
-             .transition()
-             .duration(250)
-             .style('opacity', 0)
-             .on('end interrupt', () => {
-               editOff();
-               dispatch.call('change');
-             });
-         }
+           if (allowsBridge(featureType1) && allowsBridge(featureType2)) {
+             if (hasTag(tags1, 'bridge') && !hasTag(tags2, 'bridge')) return true;
+             if (!hasTag(tags1, 'bridge') && hasTag(tags2, 'bridge')) return true; // crossing bridges must use different layers
 
-         // Update the issue markers
-         function updateMarkers() {
-           if (!layerVisible || !_layerEnabled$1) return;
+             if (hasTag(tags1, 'bridge') && hasTag(tags2, 'bridge') && layer1 !== layer2) return true;
+           } else if (allowsBridge(featureType1) && hasTag(tags1, 'bridge')) return true;else if (allowsBridge(featureType2) && hasTag(tags2, 'bridge')) return true;
 
-           const service = getService();
-           const selectedID = context.selectedErrorID();
-           const data = (service ? service.getItems(projection) : []);
-           const getTransform = svgPointTransform(projection);
+           if (allowsTunnel(featureType1) && allowsTunnel(featureType2)) {
+             if (hasTag(tags1, 'tunnel') && !hasTag(tags2, 'tunnel')) return true;
+             if (!hasTag(tags1, 'tunnel') && hasTag(tags2, 'tunnel')) return true; // crossing tunnels must use different layers
 
-           // Draw markers..
-           const markers = drawLayer.selectAll('.qaItem.improveOSM')
-             .data(data, d => d.id);
+             if (hasTag(tags1, 'tunnel') && hasTag(tags2, 'tunnel') && layer1 !== layer2) return true;
+           } else if (allowsTunnel(featureType1) && hasTag(tags1, 'tunnel')) return true;else if (allowsTunnel(featureType2) && hasTag(tags2, 'tunnel')) return true; // don't flag crossing waterways and pier/highways
 
-           // exit
-           markers.exit()
-             .remove();
 
-           // enter
-           const markersEnter = markers.enter()
-             .append('g')
-               .attr('class', d => `qaItem ${d.service} itemId-${d.id} itemType-${d.itemType}`);
-
-           markersEnter
-             .append('polygon')
-               .call(markerPath, 'shadow');
-
-           markersEnter
-             .append('ellipse')
-               .attr('cx', 0)
-               .attr('cy', 0)
-               .attr('rx', 4.5)
-               .attr('ry', 2)
-               .attr('class', 'stroke');
-
-           markersEnter
-             .append('polygon')
-               .attr('fill', 'currentColor')
-               .call(markerPath, 'qaItem-fill');
-
-           markersEnter
-             .append('use')
-               .attr('transform', 'translate(-6.5, -23)')
-               .attr('class', 'icon-annotation')
-               .attr('width', '13px')
-               .attr('height', '13px')
-               .attr('xlink:href', d => {
-                 const picon = d.icon;
-
-                 if (!picon) {
-                 return '';
-                 } else {
-                 const isMaki = /^maki-/.test(picon);
-                 return `#${picon}${isMaki ? '-11' : ''}`;
-                 }
-               });
+           if (featureType1 === 'waterway' && featureType2 === 'highway' && tags2.man_made === 'pier') return true;
+           if (featureType2 === 'waterway' && featureType1 === 'highway' && tags1.man_made === 'pier') return true;
 
-           // update
-           markers
-             .merge(markersEnter)
-             .sort(sortY)
-               .classed('selected', d => d.id === selectedID)
-               .attr('transform', getTransform);
+           if (featureType1 === 'building' || featureType2 === 'building') {
+             // for building crossings, different layers are enough
+             if (layer1 !== layer2) return true;
+           }
 
+           return false;
+         } // highway values for which we shouldn't recommend connecting to waterways
 
-           // Draw targets..
-           if (touchLayer.empty()) return;
-           const fillClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
-
-           const targets = touchLayer.selectAll('.qaItem.improveOSM')
-             .data(data, d => d.id);
-
-           // exit
-           targets.exit()
-             .remove();
-
-           // enter/update
-           targets.enter()
-             .append('rect')
-               .attr('width', '20px')
-               .attr('height', '30px')
-               .attr('x', '-10px')
-               .attr('y', '-28px')
-             .merge(targets)
-             .sort(sortY)
-               .attr('class', d => `qaItem ${d.service} target ${fillClass} itemId-${d.id}`)
-               .attr('transform', getTransform);
 
-           function sortY(a, b) {
-             return (a.id === selectedID) ? 1
-               : (b.id === selectedID) ? -1
-               : b.loc[1] - a.loc[1];
-           }
-         }
+         var highwaysDisallowingFords = {
+           motorway: true,
+           motorway_link: true,
+           trunk: true,
+           trunk_link: true,
+           primary: true,
+           primary_link: true,
+           secondary: true,
+           secondary_link: true
+         };
+         var nonCrossingHighways = {
+           track: true
+         };
 
-         // Draw the ImproveOSM layer and schedule loading issues and updating markers.
-         function drawImproveOSM(selection) {
-           const service = getService();
+         function tagsForConnectionNodeIfAllowed(entity1, entity2, graph) {
+           var featureType1 = getFeatureType(entity1, graph);
+           var featureType2 = getFeatureType(entity2, graph);
+           var geometry1 = entity1.geometry(graph);
+           var geometry2 = entity2.geometry(graph);
+           var bothLines = geometry1 === 'line' && geometry2 === 'line';
 
-           const surface = context.surface();
-           if (surface && !surface.empty()) {
-             touchLayer = surface.selectAll('.data-layer.touch .layer-touch.markers');
-           }
+           if (featureType1 === featureType2) {
+             if (featureType1 === 'highway') {
+               var entity1IsPath = osmPathHighwayTagValues[entity1.tags.highway];
+               var entity2IsPath = osmPathHighwayTagValues[entity2.tags.highway];
 
-           drawLayer = selection.selectAll('.layer-improveOSM')
-             .data(service ? [0] : []);
+               if ((entity1IsPath || entity2IsPath) && entity1IsPath !== entity2IsPath) {
+                 // one feature is a path but not both
+                 var roadFeature = entity1IsPath ? entity2 : entity1;
 
-           drawLayer.exit()
-             .remove();
+                 if (nonCrossingHighways[roadFeature.tags.highway]) {
+                   // don't mark path connections with certain roads as crossings
+                   return {};
+                 }
 
-           drawLayer = drawLayer.enter()
-             .append('g')
-               .attr('class', 'layer-improveOSM')
-               .style('display', _layerEnabled$1 ? 'block' : 'none')
-             .merge(drawLayer);
+                 var pathFeature = entity1IsPath ? entity1 : entity2;
 
-           if (_layerEnabled$1) {
-             if (service && ~~context.map().zoom() >= minZoom) {
-               editOn();
-               service.loadIssues(projection);
-               updateMarkers();
-             } else {
-               editOff();
-             }
-           }
-         }
+                 if (['marked', 'unmarked'].indexOf(pathFeature.tags.crossing) !== -1) {
+                   // if the path is a crossing, match the crossing type
+                   return bothLines ? {
+                     highway: 'crossing',
+                     crossing: pathFeature.tags.crossing
+                   } : {};
+                 } // don't add a `crossing` subtag to ambiguous crossings
 
-         // Toggles the layer on and off
-         drawImproveOSM.enabled = function(val) {
-           if (!arguments.length) return _layerEnabled$1;
 
-           _layerEnabled$1 = val;
-           if (_layerEnabled$1) {
-             layerOn();
-           } else {
-             layerOff();
-             if (context.selectedErrorID()) {
-               context.enter(modeBrowse(context));
+                 return bothLines ? {
+                   highway: 'crossing'
+                 } : {};
+               }
+
+               return {};
              }
-           }
 
-           dispatch.call('change');
-           return this;
-         };
+             if (featureType1 === 'waterway') return {};
+             if (featureType1 === 'railway') return {};
+           } else {
+             var featureTypes = [featureType1, featureType2];
 
-         drawImproveOSM.supported = () => !!getService();
+             if (featureTypes.indexOf('highway') !== -1) {
+               if (featureTypes.indexOf('railway') !== -1) {
+                 if (!bothLines) return {};
+                 var isTram = entity1.tags.railway === 'tram' || entity2.tags.railway === 'tram';
 
-         return drawImproveOSM;
-       }
+                 if (osmPathHighwayTagValues[entity1.tags.highway] || osmPathHighwayTagValues[entity2.tags.highway]) {
+                   // path-tram connections use this tag
+                   if (isTram) return {
+                     railway: 'tram_crossing'
+                   }; // other path-rail connections use this tag
 
-       let _layerEnabled$2 = false;
-       let _qaService$2;
+                   return {
+                     railway: 'crossing'
+                   };
+                 } else {
+                   // path-tram connections use this tag
+                   if (isTram) return {
+                     railway: 'tram_level_crossing'
+                   }; // other road-rail connections use this tag
 
-       function svgOsmose(projection, context, dispatch) {
-         const throttledRedraw = throttle(() => dispatch.call('change'), 1000);
-         const minZoom = 12;
+                   return {
+                     railway: 'level_crossing'
+                   };
+                 }
+               }
 
-         let touchLayer = select(null);
-         let drawLayer = select(null);
-         let layerVisible = false;
+               if (featureTypes.indexOf('waterway') !== -1) {
+                 // do not allow fords on structures
+                 if (hasTag(entity1.tags, 'tunnel') && hasTag(entity2.tags, 'tunnel')) return null;
+                 if (hasTag(entity1.tags, 'bridge') && hasTag(entity2.tags, 'bridge')) return null;
 
-         function markerPath(selection, klass) {
-           selection
-             .attr('class', klass)
-             .attr('transform', 'translate(-10, -28)')
-             .attr('points', '16,3 4,3 1,6 1,17 4,20 7,20 10,27 13,20 16,20 19,17.033 19,6');
-         }
+                 if (highwaysDisallowingFords[entity1.tags.highway] || highwaysDisallowingFords[entity2.tags.highway]) {
+                   // do not allow fords on major highways
+                   return null;
+                 }
 
-         // Loosely-coupled osmose service for fetching issues
-         function getService() {
-           if (services.osmose && !_qaService$2) {
-             _qaService$2 = services.osmose;
-             _qaService$2.on('loaded', throttledRedraw);
-           } else if (!services.osmose && _qaService$2) {
-             _qaService$2 = null;
+                 return bothLines ? {
+                   ford: 'yes'
+                 } : {};
+               }
+             }
            }
 
-           return _qaService$2;
+           return null;
          }
 
-         // Show the markers
-         function editOn() {
-           if (!layerVisible) {
-             layerVisible = true;
-             drawLayer
-               .style('display', 'block');
-           }
-         }
+         function findCrossingsByWay(way1, graph, tree) {
+           var edgeCrossInfos = [];
+           if (way1.type !== 'way') return edgeCrossInfos;
+           var taggedFeature1 = getFeatureWithFeatureTypeTagsForWay(way1, graph);
+           var way1FeatureType = getFeatureType(taggedFeature1, graph);
+           if (way1FeatureType === null) return edgeCrossInfos;
+           var checkedSingleCrossingWays = {}; // declare vars ahead of time to reduce garbage collection
 
-         // Immediately remove the markers and their touch targets
-         function editOff() {
-           if (layerVisible) {
-             layerVisible = false;
-             drawLayer
-               .style('display', 'none');
-             drawLayer.selectAll('.qaItem.osmose')
-               .remove();
-             touchLayer.selectAll('.qaItem.osmose')
-               .remove();
-           }
-         }
+           var i, j;
+           var extent;
+           var n1, n2, nA, nB, nAId, nBId;
+           var segment1, segment2;
+           var oneOnly;
+           var segmentInfos, segment2Info, way2, taggedFeature2, way2FeatureType;
+           var way1Nodes = graph.childNodes(way1);
+           var comparedWays = {};
 
-         // Enable the layer.  This shows the markers and transitions them to visible.
-         function layerOn() {
-           editOn();
+           for (i = 0; i < way1Nodes.length - 1; i++) {
+             n1 = way1Nodes[i];
+             n2 = way1Nodes[i + 1];
+             extent = geoExtent([[Math.min(n1.loc[0], n2.loc[0]), Math.min(n1.loc[1], n2.loc[1])], [Math.max(n1.loc[0], n2.loc[0]), Math.max(n1.loc[1], n2.loc[1])]]); // Optimize by only checking overlapping segments, not every segment
+             // of overlapping ways
 
-           drawLayer
-             .style('opacity', 0)
-             .transition()
-             .duration(250)
-             .style('opacity', 1)
-             .on('end interrupt', () => dispatch.call('change'));
-         }
+             segmentInfos = tree.waySegments(extent, graph);
 
-         // Disable the layer.  This transitions the layer invisible and then hides the markers.
-         function layerOff() {
-           throttledRedraw.cancel();
-           drawLayer.interrupt();
-           touchLayer.selectAll('.qaItem.osmose')
-             .remove();
-
-           drawLayer
-             .transition()
-             .duration(250)
-             .style('opacity', 0)
-             .on('end interrupt', () => {
-               editOff();
-               dispatch.call('change');
-             });
-         }
+             for (j = 0; j < segmentInfos.length; j++) {
+               segment2Info = segmentInfos[j]; // don't check for self-intersection in this validation
 
-         // Update the issue markers
-         function updateMarkers() {
-           if (!layerVisible || !_layerEnabled$2) return;
+               if (segment2Info.wayId === way1.id) continue; // skip if this way was already checked and only one issue is needed
 
-           const service = getService();
-           const selectedID = context.selectedErrorID();
-           const data = (service ? service.getItems(projection) : []);
-           const getTransform = svgPointTransform(projection);
+               if (checkedSingleCrossingWays[segment2Info.wayId]) continue; // mark this way as checked even if there are no crossings
 
-           // Draw markers..
-           const markers = drawLayer.selectAll('.qaItem.osmose')
-             .data(data, d => d.id);
+               comparedWays[segment2Info.wayId] = true;
+               way2 = graph.hasEntity(segment2Info.wayId);
+               if (!way2) continue;
+               taggedFeature2 = getFeatureWithFeatureTypeTagsForWay(way2, graph); // only check crossing highway, waterway, building, and railway
 
-           // exit
-           markers.exit()
-             .remove();
+               way2FeatureType = getFeatureType(taggedFeature2, graph);
 
-           // enter
-           const markersEnter = markers.enter()
-             .append('g')
-               .attr('class', d => `qaItem ${d.service} itemId-${d.id} itemType-${d.itemType}`);
-
-           markersEnter
-             .append('polygon')
-               .call(markerPath, 'shadow');
-
-           markersEnter
-             .append('ellipse')
-               .attr('cx', 0)
-               .attr('cy', 0)
-               .attr('rx', 4.5)
-               .attr('ry', 2)
-               .attr('class', 'stroke');
-
-           markersEnter
-             .append('polygon')
-               .attr('fill', d => service.getColor(d.item))
-               .call(markerPath, 'qaItem-fill');
-
-           markersEnter
-             .append('use')
-               .attr('transform', 'translate(-6.5, -23)')
-               .attr('class', 'icon-annotation')
-               .attr('width', '13px')
-               .attr('height', '13px')
-               .attr('xlink:href', d => {
-                 const picon = d.icon;
-
-                 if (!picon) {
-                   return '';
-                 } else {
-                   const isMaki = /^maki-/.test(picon);
-                   return `#${picon}${isMaki ? '-11' : ''}`;
-                 }
-               });
+               if (way2FeatureType === null || isLegitCrossing(taggedFeature1.tags, way1FeatureType, taggedFeature2.tags, way2FeatureType)) {
+                 continue;
+               } // create only one issue for building crossings
 
-           // update
-           markers
-             .merge(markersEnter)
-             .sort(sortY)
-               .classed('selected', d => d.id === selectedID)
-               .attr('transform', getTransform);
 
-           // Draw targets..
-           if (touchLayer.empty()) return;
-           const fillClass = context.getDebug('target') ? 'pink' : 'nocolor';
-
-           const targets = touchLayer.selectAll('.qaItem.osmose')
-             .data(data, d => d.id);
-
-           // exit
-           targets.exit()
-             .remove();
-
-           // enter/update
-           targets.enter()
-             .append('rect')
-               .attr('width', '20px')
-               .attr('height', '30px')
-               .attr('x', '-10px')
-               .attr('y', '-28px')
-             .merge(targets)
-             .sort(sortY)
-               .attr('class', d => `qaItem ${d.service} target ${fillClass} itemId-${d.id}`)
-               .attr('transform', getTransform);
+               oneOnly = way1FeatureType === 'building' || way2FeatureType === 'building';
+               nAId = segment2Info.nodes[0];
+               nBId = segment2Info.nodes[1];
 
-           function sortY(a, b) {
-             return (a.id === selectedID) ? 1
-               : (b.id === selectedID) ? -1
-               : b.loc[1] - a.loc[1];
-           }
-         }
+               if (nAId === n1.id || nAId === n2.id || nBId === n1.id || nBId === n2.id) {
+                 // n1 or n2 is a connection node; skip
+                 continue;
+               }
 
-         // Draw the Osmose layer and schedule loading issues and updating markers.
-         function drawOsmose(selection) {
-           const service = getService();
+               nA = graph.hasEntity(nAId);
+               if (!nA) continue;
+               nB = graph.hasEntity(nBId);
+               if (!nB) continue;
+               segment1 = [n1.loc, n2.loc];
+               segment2 = [nA.loc, nB.loc];
+               var point = geoLineIntersection(segment1, segment2);
+
+               if (point) {
+                 edgeCrossInfos.push({
+                   wayInfos: [{
+                     way: way1,
+                     featureType: way1FeatureType,
+                     edge: [n1.id, n2.id]
+                   }, {
+                     way: way2,
+                     featureType: way2FeatureType,
+                     edge: [nA.id, nB.id]
+                   }],
+                   crossPoint: point
+                 });
 
-           const surface = context.surface();
-           if (surface && !surface.empty()) {
-             touchLayer = surface.selectAll('.data-layer.touch .layer-touch.markers');
+                 if (oneOnly) {
+                   checkedSingleCrossingWays[way2.id] = true;
+                   break;
+                 }
+               }
+             }
            }
 
-           drawLayer = selection.selectAll('.layer-osmose')
-             .data(service ? [0] : []);
+           return edgeCrossInfos;
+         }
 
-           drawLayer.exit()
-             .remove();
+         function waysToCheck(entity, graph) {
+           var featureType = getFeatureType(entity, graph);
+           if (!featureType) return [];
 
-           drawLayer = drawLayer.enter()
-             .append('g')
-               .attr('class', 'layer-osmose')
-               .style('display', _layerEnabled$2 ? 'block' : 'none')
-             .merge(drawLayer);
+           if (entity.type === 'way') {
+             return [entity];
+           } else if (entity.type === 'relation') {
+             return entity.members.reduce(function (array, member) {
+               if (member.type === 'way' && ( // only look at geometry ways
+               !member.role || member.role === 'outer' || member.role === 'inner')) {
+                 var entity = graph.hasEntity(member.id); // don't add duplicates
 
-           if (_layerEnabled$2) {
-             if (service && ~~context.map().zoom() >= minZoom) {
-               editOn();
-               service.loadIssues(projection);
-               updateMarkers();
-             } else {
-               editOff();
-             }
+                 if (entity && array.indexOf(entity) === -1) {
+                   array.push(entity);
+                 }
+               }
+
+               return array;
+             }, []);
            }
+
+           return [];
          }
 
-         // Toggles the layer on and off
-         drawOsmose.enabled = function(val) {
-           if (!arguments.length) return _layerEnabled$2;
+         var validation = function checkCrossingWays(entity, graph) {
+           var tree = context.history().tree();
+           var ways = waysToCheck(entity, graph);
+           var issues = []; // declare these here to reduce garbage collection
 
-           _layerEnabled$2 = val;
-           if (_layerEnabled$2) {
-             // Strings supplied by Osmose fetched before showing layer for first time
-             // NOTE: Currently no way to change locale in iD at runtime, would need to re-call this method if that's ever implemented
-             // Also, If layer is toggled quickly multiple requests are sent
-             getService().loadStrings()
-               .then(layerOn)
-               .catch(err => {
-                 console.log(err); // eslint-disable-line no-console
-               });
-           } else {
-             layerOff();
-             if (context.selectedErrorID()) {
-               context.enter(modeBrowse(context));
+           var wayIndex, crossingIndex, crossings;
+
+           for (wayIndex in ways) {
+             crossings = findCrossingsByWay(ways[wayIndex], graph, tree);
+
+             for (crossingIndex in crossings) {
+               issues.push(createIssue(crossings[crossingIndex], graph));
              }
            }
 
-           dispatch.call('change');
-           return this;
+           return issues;
          };
 
-         drawOsmose.supported = () => !!getService();
+         function createIssue(crossing, graph) {
+           // use the entities with the tags that define the feature type
+           crossing.wayInfos.sort(function (way1Info, way2Info) {
+             var type1 = way1Info.featureType;
+             var type2 = way2Info.featureType;
 
-         return drawOsmose;
-       }
+             if (type1 === type2) {
+               return utilDisplayLabel(way1Info.way, graph) > utilDisplayLabel(way2Info.way, graph);
+             } else if (type1 === 'waterway') {
+               return true;
+             } else if (type2 === 'waterway') {
+               return false;
+             }
 
-       function svgStreetside(projection, context, dispatch) {
-           var throttledRedraw = throttle(function () { dispatch.call('change'); }, 1000);
-           var minZoom = 14;
-           var minMarkerZoom = 16;
-           var minViewfieldZoom = 18;
-           var layer = select(null);
-           var _viewerYaw = 0;
-           var _selectedSequence = null;
-           var _streetside;
+             return type1 < type2;
+           });
+           var entities = crossing.wayInfos.map(function (wayInfo) {
+             return getFeatureWithFeatureTypeTagsForWay(wayInfo.way, graph);
+           });
+           var edges = [crossing.wayInfos[0].edge, crossing.wayInfos[1].edge];
+           var featureTypes = [crossing.wayInfos[0].featureType, crossing.wayInfos[1].featureType];
+           var connectionTags = tagsForConnectionNodeIfAllowed(entities[0], entities[1], graph);
+           var featureType1 = crossing.wayInfos[0].featureType;
+           var featureType2 = crossing.wayInfos[1].featureType;
+           var isCrossingIndoors = taggedAsIndoor(entities[0].tags) && taggedAsIndoor(entities[1].tags);
+           var isCrossingTunnels = allowsTunnel(featureType1) && hasTag(entities[0].tags, 'tunnel') && allowsTunnel(featureType2) && hasTag(entities[1].tags, 'tunnel');
+           var isCrossingBridges = allowsBridge(featureType1) && hasTag(entities[0].tags, 'bridge') && allowsBridge(featureType2) && hasTag(entities[1].tags, 'bridge');
+           var subtype = [featureType1, featureType2].sort().join('-');
+           var crossingTypeID = subtype;
 
-           /**
-            * init().
-            */
-           function init() {
-               if (svgStreetside.initialized) return;  // run once
-               svgStreetside.enabled = false;
-               svgStreetside.initialized = true;
+           if (isCrossingIndoors) {
+             crossingTypeID = 'indoor-indoor';
+           } else if (isCrossingTunnels) {
+             crossingTypeID = 'tunnel-tunnel';
+           } else if (isCrossingBridges) {
+             crossingTypeID = 'bridge-bridge';
            }
 
-           /**
-            * getService().
-            */
-           function getService() {
-               if (services.streetside && !_streetside) {
-                   _streetside = services.streetside;
-                   _streetside.event
-                       .on('viewerChanged.svgStreetside', viewerChanged)
-                       .on('loadedBubbles.svgStreetside', throttledRedraw);
-               } else if (!services.streetside && _streetside) {
-                   _streetside = null;
-               }
-
-               return _streetside;
+           if (connectionTags && (isCrossingIndoors || isCrossingTunnels || isCrossingBridges)) {
+             crossingTypeID += '_connectable';
            }
 
-           /**
-            * showLayer().
-            */
-           function showLayer() {
-               var service = getService();
-               if (!service) return;
+           return new validationIssue({
+             type: type,
+             subtype: subtype,
+             severity: 'warning',
+             message: function message(context) {
+               var graph = context.graph();
+               var entity1 = graph.hasEntity(this.entityIds[0]),
+                   entity2 = graph.hasEntity(this.entityIds[1]);
+               return entity1 && entity2 ? _t.html('issues.crossing_ways.message', {
+                 feature: utilDisplayLabel(entity1, graph),
+                 feature2: utilDisplayLabel(entity2, graph)
+               }) : '';
+             },
+             reference: showReference,
+             entityIds: entities.map(function (entity) {
+               return entity.id;
+             }),
+             data: {
+               edges: edges,
+               featureTypes: featureTypes,
+               connectionTags: connectionTags
+             },
+             // differentiate based on the loc since two ways can cross multiple times
+             hash: crossing.crossPoint.toString() + // if the edges change then so does the fix
+             edges.slice().sort(function (edge1, edge2) {
+               // order to assure hash is deterministic
+               return edge1[0] < edge2[0] ? -1 : 1;
+             }).toString() + // ensure the correct connection tags are added in the fix
+             JSON.stringify(connectionTags),
+             loc: crossing.crossPoint,
+             dynamicFixes: function dynamicFixes(context) {
+               var mode = context.mode();
+               if (!mode || mode.id !== 'select' || mode.selectedIDs().length !== 1) return [];
+               var selectedIndex = this.entityIds[0] === mode.selectedIDs()[0] ? 0 : 1;
+               var selectedFeatureType = this.data.featureTypes[selectedIndex];
+               var otherFeatureType = this.data.featureTypes[selectedIndex === 0 ? 1 : 0];
+               var fixes = [];
+
+               if (connectionTags) {
+                 fixes.push(makeConnectWaysFix(this.data.connectionTags));
+               }
+
+               if (isCrossingIndoors) {
+                 fixes.push(new validationIssueFix({
+                   icon: 'iD-icon-layers',
+                   title: _t.html('issues.fix.use_different_levels.title')
+                 }));
+               } else if (isCrossingTunnels || isCrossingBridges || featureType1 === 'building' || featureType2 === 'building') {
+                 fixes.push(makeChangeLayerFix('higher'));
+                 fixes.push(makeChangeLayerFix('lower')); // can only add bridge/tunnel if both features are lines
+               } else if (context.graph().geometry(this.entityIds[0]) === 'line' && context.graph().geometry(this.entityIds[1]) === 'line') {
+                 // don't recommend adding bridges to waterways since they're uncommon
+                 if (allowsBridge(selectedFeatureType) && selectedFeatureType !== 'waterway') {
+                   fixes.push(makeAddBridgeOrTunnelFix('add_a_bridge', 'temaki-bridge', 'bridge'));
+                 } // don't recommend adding tunnels under waterways since they're uncommon
 
-               editOn();
 
-               layer
-                   .style('opacity', 0)
-                   .transition()
-                   .duration(250)
-                   .style('opacity', 1)
-                   .on('end', function () { dispatch.call('change'); });
-           }
+                 var skipTunnelFix = otherFeatureType === 'waterway' && selectedFeatureType !== 'waterway';
 
-           /**
-            * hideLayer().
-            */
-           function hideLayer() {
-               throttledRedraw.cancel();
+                 if (allowsTunnel(selectedFeatureType) && !skipTunnelFix) {
+                   fixes.push(makeAddBridgeOrTunnelFix('add_a_tunnel', 'temaki-tunnel', 'tunnel'));
+                 }
+               } // repositioning the features is always an option
 
-               layer
-                   .transition()
-                   .duration(250)
-                   .style('opacity', 0)
-                   .on('end', editOff);
-           }
 
-           /**
-            * editOn().
-            */
-           function editOn() {
-               layer.style('display', 'block');
-           }
+               fixes.push(new validationIssueFix({
+                 icon: 'iD-operation-move',
+                 title: _t.html('issues.fix.reposition_features.title')
+               }));
+               return fixes;
+             }
+           });
 
-           /**
-            * editOff().
-            */
-           function editOff() {
-               layer.selectAll('.viewfield-group').remove();
-               layer.style('display', 'none');
+           function showReference(selection) {
+             selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.crossing_ways.' + crossingTypeID + '.reference'));
            }
+         }
 
-           /**
-            * click() Handles 'bubble' point click event.
-            */
-           function click(d) {
-               var service = getService();
-               if (!service) return;
-
-               // try to preserve the viewer rotation when staying on the same sequence
-               if (d.sequenceKey !== _selectedSequence) {
-                   _viewerYaw = 0;  // reset
+         function makeAddBridgeOrTunnelFix(fixTitleID, iconName, bridgeOrTunnel) {
+           return new validationIssueFix({
+             icon: iconName,
+             title: _t.html('issues.fix.' + fixTitleID + '.title'),
+             onClick: function onClick(context) {
+               var mode = context.mode();
+               if (!mode || mode.id !== 'select') return;
+               var selectedIDs = mode.selectedIDs();
+               if (selectedIDs.length !== 1) return;
+               var selectedWayID = selectedIDs[0];
+               if (!context.hasEntity(selectedWayID)) return;
+               var resultWayIDs = [selectedWayID];
+               var edge, crossedEdge, crossedWayID;
+
+               if (this.issue.entityIds[0] === selectedWayID) {
+                 edge = this.issue.data.edges[0];
+                 crossedEdge = this.issue.data.edges[1];
+                 crossedWayID = this.issue.entityIds[1];
+               } else {
+                 edge = this.issue.data.edges[1];
+                 crossedEdge = this.issue.data.edges[0];
+                 crossedWayID = this.issue.entityIds[0];
                }
-               _selectedSequence = d.sequenceKey;
 
-               service
-                   .selectImage(context, d)
-                   .then(response => {
-                       if (response.status === 'ok'){
-                           service.showViewer(context, _viewerYaw);
-                       }
-                   });
+               var crossingLoc = this.issue.loc;
+               var projection = context.projection;
 
+               var action = function actionAddStructure(graph) {
+                 var edgeNodes = [graph.entity(edge[0]), graph.entity(edge[1])];
+                 var crossedWay = graph.hasEntity(crossedWayID); // use the explicit width of the crossed feature as the structure length, if available
 
-               context.map().centerEase(d.loc);
-           }
+                 var structLengthMeters = crossedWay && crossedWay.tags.width && parseFloat(crossedWay.tags.width);
 
-           /**
-            * mouseover().
-            */
-           function mouseover(d) {
-               var service = getService();
-               if (service) service.setStyles(context, d);
-           }
+                 if (!structLengthMeters) {
+                   // if no explicit width is set, approximate the width based on the tags
+                   structLengthMeters = crossedWay && crossedWay.impliedLineWidthMeters();
+                 }
 
-           /**
-            * mouseout().
-            */
-           function mouseout() {
-               var service = getService();
-               if (service) service.setStyles(context, null);
-           }
+                 if (structLengthMeters) {
+                   if (getFeatureType(crossedWay, graph) === 'railway') {
+                     // bridges over railways are generally much longer than the rail bed itself, compensate
+                     structLengthMeters *= 2;
+                   }
+                 } else {
+                   // should ideally never land here since all rail/water/road tags should have an implied width
+                   structLengthMeters = 8;
+                 }
 
-           /**
-            * transform().
-            */
-           function transform(d) {
-               var t = svgPointTransform(projection)(d);
-               var rot = d.ca + _viewerYaw;
-               if (rot) {
-                   t += ' rotate(' + Math.floor(rot) + ',0,0)';
-               }
-               return t;
-           }
+                 var a1 = geoAngle(edgeNodes[0], edgeNodes[1], projection) + Math.PI;
+                 var a2 = geoAngle(graph.entity(crossedEdge[0]), graph.entity(crossedEdge[1]), projection) + Math.PI;
+                 var crossingAngle = Math.max(a1, a2) - Math.min(a1, a2);
+                 if (crossingAngle > Math.PI) crossingAngle -= Math.PI; // lengthen the structure to account for the angle of the crossing
 
+                 structLengthMeters = structLengthMeters / 2 / Math.sin(crossingAngle) * 2; // add padding since the structure must extend past the edges of the crossed feature
 
-           function viewerChanged() {
-               var service = getService();
-               if (!service) return;
+                 structLengthMeters += 4; // clamp the length to a reasonable range
 
-               var viewer = service.viewer();
-               if (!viewer) return;
+                 structLengthMeters = Math.min(Math.max(structLengthMeters, 4), 50);
 
-               // update viewfield rotation
-               _viewerYaw = viewer.getYaw();
+                 function geomToProj(geoPoint) {
+                   return [geoLonToMeters(geoPoint[0], geoPoint[1]), geoLatToMeters(geoPoint[1])];
+                 }
 
-               // avoid updating if the map is currently transformed
-               // e.g. during drags or easing.
-               if (context.map().isTransformed()) return;
+                 function projToGeom(projPoint) {
+                   var lat = geoMetersToLat(projPoint[1]);
+                   return [geoMetersToLon(projPoint[0], lat), lat];
+                 }
 
-               layer.selectAll('.viewfield-group.currentView')
-                   .attr('transform', transform);
-           }
+                 var projEdgeNode1 = geomToProj(edgeNodes[0].loc);
+                 var projEdgeNode2 = geomToProj(edgeNodes[1].loc);
+                 var projectedAngle = geoVecAngle(projEdgeNode1, projEdgeNode2);
+                 var projectedCrossingLoc = geomToProj(crossingLoc);
+                 var linearToSphericalMetersRatio = geoVecLength(projEdgeNode1, projEdgeNode2) / geoSphericalDistance(edgeNodes[0].loc, edgeNodes[1].loc);
 
+                 function locSphericalDistanceFromCrossingLoc(angle, distanceMeters) {
+                   var lengthSphericalMeters = distanceMeters * linearToSphericalMetersRatio;
+                   return projToGeom([projectedCrossingLoc[0] + Math.cos(angle) * lengthSphericalMeters, projectedCrossingLoc[1] + Math.sin(angle) * lengthSphericalMeters]);
+                 }
 
-           context.photos().on('change.streetside', update);
+                 var endpointLocGetter1 = function endpointLocGetter1(lengthMeters) {
+                   return locSphericalDistanceFromCrossingLoc(projectedAngle, lengthMeters);
+                 };
 
-           /**
-            * update().
-            */
-           function update() {
-               var viewer = context.container().select('.photoviewer');
-               var selected = viewer.empty() ? undefined : viewer.datum();
-               var z = ~~context.map().zoom();
-               var showMarkers = (z >= minMarkerZoom);
-               var showViewfields = (z >= minViewfieldZoom);
-               var service = getService();
+                 var endpointLocGetter2 = function endpointLocGetter2(lengthMeters) {
+                   return locSphericalDistanceFromCrossingLoc(projectedAngle + Math.PI, lengthMeters);
+                 }; // avoid creating very short edges from splitting too close to another node
 
-               var sequences = [];
-               var bubbles = [];
 
-               if (context.photos().showsPanoramic()) {
-                   sequences = (service ? service.sequences(projection) : []);
-                   bubbles = (service && showMarkers ? service.bubbles(projection) : []);
-               }
+                 var minEdgeLengthMeters = 0.55; // decide where to bound the structure along the way, splitting as necessary
 
-               var traces = layer.selectAll('.sequences').selectAll('.sequence')
-                   .data(sequences, function(d) { return d.properties.key; });
+                 function determineEndpoint(edge, endNode, locGetter) {
+                   var newNode;
+                   var idealLengthMeters = structLengthMeters / 2; // distance between the crossing location and the end of the edge,
+                   // the maximum length of this side of the structure
+
+                   var crossingToEdgeEndDistance = geoSphericalDistance(crossingLoc, endNode.loc);
+
+                   if (crossingToEdgeEndDistance - idealLengthMeters > minEdgeLengthMeters) {
+                     // the edge is long enough to insert a new node
+                     // the loc that would result in the full expected length
+                     var idealNodeLoc = locGetter(idealLengthMeters);
+                     newNode = osmNode();
+                     graph = actionAddMidpoint({
+                       loc: idealNodeLoc,
+                       edge: edge
+                     }, newNode)(graph);
+                   } else {
+                     var edgeCount = 0;
+                     endNode.parentIntersectionWays(graph).forEach(function (way) {
+                       way.nodes.forEach(function (nodeID) {
+                         if (nodeID === endNode.id) {
+                           if (endNode.id === way.first() && endNode.id !== way.last() || endNode.id === way.last() && endNode.id !== way.first()) {
+                             edgeCount += 1;
+                           } else {
+                             edgeCount += 2;
+                           }
+                         }
+                       });
+                     });
 
-               // exit
-               traces.exit()
-                   .remove();
+                     if (edgeCount >= 3) {
+                       // the end node is a junction, try to leave a segment
+                       // between it and the structure - #7202
+                       var insetLength = crossingToEdgeEndDistance - minEdgeLengthMeters;
+
+                       if (insetLength > minEdgeLengthMeters) {
+                         var insetNodeLoc = locGetter(insetLength);
+                         newNode = osmNode();
+                         graph = actionAddMidpoint({
+                           loc: insetNodeLoc,
+                           edge: edge
+                         }, newNode)(graph);
+                       }
+                     }
+                   } // if the edge is too short to subdivide as desired, then
+                   // just bound the structure at the existing end node
 
-               // enter/update
-               traces = traces.enter()
-                   .append('path')
-                   .attr('class', 'sequence')
-                   .merge(traces)
-                   .attr('d', svgPath(projection).geojson);
 
+                   if (!newNode) newNode = endNode;
+                   var splitAction = actionSplit([newNode.id]).limitWays(resultWayIDs); // only split selected or created ways
+                   // do the split
 
-               var groups = layer.selectAll('.markers').selectAll('.viewfield-group')
-                   .data(bubbles, function(d) {
-                       // force reenter once bubbles are attached to a sequence
-                       return d.key + (d.sequenceKey ? 'v1' : 'v0');
-                   });
+                   graph = splitAction(graph);
 
-               // exit
-               groups.exit()
-                   .remove();
-
-               // enter
-               var groupsEnter = groups.enter()
-                   .append('g')
-                   .attr('class', 'viewfield-group')
-                   .on('mouseenter', mouseover)
-                   .on('mouseleave', mouseout)
-                   .on('click', click);
-
-               groupsEnter
-                   .append('g')
-                   .attr('class', 'viewfield-scale');
-
-               // update
-               var markers = groups
-                   .merge(groupsEnter)
-                   .sort(function(a, b) {
-                       return (a === selected) ? 1
-                           : (b === selected) ? -1
-                           : b.loc[1] - a.loc[1];
-                   })
-                   .attr('transform', transform)
-                   .select('.viewfield-scale');
-
-
-               markers.selectAll('circle')
-                   .data([0])
-                   .enter()
-                   .append('circle')
-                   .attr('dx', '0')
-                   .attr('dy', '0')
-                   .attr('r', '6');
-
-               var viewfields = markers.selectAll('.viewfield')
-                   .data(showViewfields ? [0] : []);
-
-               viewfields.exit()
-                   .remove();
-
-               // viewfields may or may not be drawn...
-               // but if they are, draw below the circles
-               viewfields.enter()
-                   .insert('path', 'circle')
-                   .attr('class', 'viewfield')
-                   .attr('transform', 'scale(1.5,1.5),translate(-8, -13)')
-                   .attr('d', viewfieldPath);
-
-               function viewfieldPath() {
-                   var d = this.parentNode.__data__;
-                   if (d.pano) {
-                       return 'M 8,13 m -10,0 a 10,10 0 1,0 20,0 a 10,10 0 1,0 -20,0';
-                   } else {
-                       return 'M 6,9 C 8,8.4 8,8.4 10,9 L 16,-2 C 12,-5 4,-5 0,-2 z';
+                   if (splitAction.getCreatedWayIDs().length) {
+                     resultWayIDs.push(splitAction.getCreatedWayIDs()[0]);
                    }
-               }
 
-           }
+                   return newNode;
+                 }
 
-           /**
-            * drawImages()
-            * drawImages is the method that is returned (and that runs) everytime 'svgStreetside()' is called.
-            * 'svgStreetside()' is called from index.js
-            */
-           function drawImages(selection) {
-               var enabled = svgStreetside.enabled;
-               var service = getService();
+                 var structEndNode1 = determineEndpoint(edge, edgeNodes[1], endpointLocGetter1);
+                 var structEndNode2 = determineEndpoint([edgeNodes[0].id, structEndNode1.id], edgeNodes[0], endpointLocGetter2);
+                 var structureWay = resultWayIDs.map(function (id) {
+                   return graph.entity(id);
+                 }).find(function (way) {
+                   return way.nodes.indexOf(structEndNode1.id) !== -1 && way.nodes.indexOf(structEndNode2.id) !== -1;
+                 });
+                 var tags = Object.assign({}, structureWay.tags); // copy tags
+
+                 if (bridgeOrTunnel === 'bridge') {
+                   tags.bridge = 'yes';
+                   tags.layer = '1';
+                 } else {
+                   var tunnelValue = 'yes';
+
+                   if (getFeatureType(structureWay, graph) === 'waterway') {
+                     // use `tunnel=culvert` for waterways by default
+                     tunnelValue = 'culvert';
+                   }
 
-               layer = selection.selectAll('.layer-streetside-images')
-                   .data(service ? [0] : []);
+                   tags.tunnel = tunnelValue;
+                   tags.layer = '-1';
+                 } // apply the structure tags to the way
 
-               layer.exit()
-                   .remove();
 
-               var layerEnter = layer.enter()
-                   .append('g')
-                   .attr('class', 'layer-streetside-images')
-                   .style('display', enabled ? 'block' : 'none');
+                 graph = actionChangeTags(structureWay.id, tags)(graph);
+                 return graph;
+               };
 
-               layerEnter
-                   .append('g')
-                   .attr('class', 'sequences');
+               context.perform(action, _t('issues.fix.' + fixTitleID + '.annotation'));
+               context.enter(modeSelect(context, resultWayIDs));
+             }
+           });
+         }
 
-               layerEnter
-                   .append('g')
-                   .attr('class', 'markers');
+         function makeConnectWaysFix(connectionTags) {
+           var fixTitleID = 'connect_features';
 
-               layer = layerEnter
-                   .merge(layer);
+           if (connectionTags.ford) {
+             fixTitleID = 'connect_using_ford';
+           }
 
-               if (enabled) {
-                   if (service && ~~context.map().zoom() >= minZoom) {
-                       editOn();
-                       update();
-                       service.loadBubbles(projection);
+           return new validationIssueFix({
+             icon: 'iD-icon-crossing',
+             title: _t.html('issues.fix.' + fixTitleID + '.title'),
+             onClick: function onClick(context) {
+               var loc = this.issue.loc;
+               var connectionTags = this.issue.data.connectionTags;
+               var edges = this.issue.data.edges;
+               context.perform(function actionConnectCrossingWays(graph) {
+                 // create the new node for the points
+                 var node = osmNode({
+                   loc: loc,
+                   tags: connectionTags
+                 });
+                 graph = graph.replace(node);
+                 var nodesToMerge = [node.id];
+                 var mergeThresholdInMeters = 0.75;
+                 edges.forEach(function (edge) {
+                   var edgeNodes = [graph.entity(edge[0]), graph.entity(edge[1])];
+                   var closestNodeInfo = geoSphericalClosestNode(edgeNodes, loc); // if there is already a point nearby, use that
+
+                   if (closestNodeInfo.distance < mergeThresholdInMeters) {
+                     nodesToMerge.push(closestNodeInfo.node.id); // else add the new node to the way
                    } else {
-                       editOff();
+                     graph = actionAddMidpoint({
+                       loc: loc,
+                       edge: edge
+                     }, node)(graph);
                    }
-               }
-           }
+                 });
 
+                 if (nodesToMerge.length > 1) {
+                   // if we're using nearby nodes, merge them with the new node
+                   graph = actionMergeNodes(nodesToMerge, loc)(graph);
+                 }
 
-           /**
-            * drawImages.enabled().
-            */
-           drawImages.enabled = function(_) {
-               if (!arguments.length) return svgStreetside.enabled;
-               svgStreetside.enabled = _;
-               if (svgStreetside.enabled) {
-                   showLayer();
+                 return graph;
+               }, _t('issues.fix.connect_crossing_features.annotation'));
+             }
+           });
+         }
+
+         function makeChangeLayerFix(higherOrLower) {
+           return new validationIssueFix({
+             icon: 'iD-icon-' + (higherOrLower === 'higher' ? 'up' : 'down'),
+             title: _t.html('issues.fix.tag_this_as_' + higherOrLower + '.title'),
+             onClick: function onClick(context) {
+               var mode = context.mode();
+               if (!mode || mode.id !== 'select') return;
+               var selectedIDs = mode.selectedIDs();
+               if (selectedIDs.length !== 1) return;
+               var selectedID = selectedIDs[0];
+               if (!this.issue.entityIds.some(function (entityId) {
+                 return entityId === selectedID;
+               })) return;
+               var entity = context.hasEntity(selectedID);
+               if (!entity) return;
+               var tags = Object.assign({}, entity.tags); // shallow copy
+
+               var layer = tags.layer && Number(tags.layer);
+
+               if (layer && !isNaN(layer)) {
+                 if (higherOrLower === 'higher') {
+                   layer += 1;
+                 } else {
+                   layer -= 1;
+                 }
                } else {
-                   hideLayer();
+                 if (higherOrLower === 'higher') {
+                   layer = 1;
+                 } else {
+                   layer = -1;
+                 }
                }
-               dispatch.call('change');
-               return this;
-           };
-
-           /**
-            * drawImages.supported().
-            */
-           drawImages.supported = function() {
-               return !!getService();
-           };
 
-           init();
+               tags.layer = layer.toString();
+               context.perform(actionChangeTags(entity.id, tags), _t('operations.change_tags.annotation'));
+             }
+           });
+         }
 
-           return drawImages;
+         validation.type = type;
+         return validation;
        }
 
-       function svgMapillaryImages(projection, context, dispatch) {
-           var throttledRedraw = throttle(function () { dispatch.call('change'); }, 1000);
-           var minZoom = 12;
-           var minMarkerZoom = 16;
-           var minViewfieldZoom = 18;
-           var layer = select(null);
-           var _mapillary;
-           var viewerCompassAngle;
-
-
-           function init() {
-               if (svgMapillaryImages.initialized) return;  // run once
-               svgMapillaryImages.enabled = false;
-               svgMapillaryImages.initialized = true;
-           }
-
-
-           function getService() {
-               if (services.mapillary && !_mapillary) {
-                   _mapillary = services.mapillary;
-                   _mapillary.event.on('loadedImages', throttledRedraw);
-                   _mapillary.event.on('bearingChanged', function(e) {
-                       viewerCompassAngle = e;
-
-                       // avoid updating if the map is currently transformed
-                       // e.g. during drags or easing.
-                       if (context.map().isTransformed()) return;
-
-                       layer.selectAll('.viewfield-group.currentView')
-                           .filter(function(d) {
-                               return d.pano;
-                           })
-                           .attr('transform', transform);
-                   });
-               } else if (!services.mapillary && _mapillary) {
-                   _mapillary = null;
+       function validationDisconnectedWay() {
+         var type = 'disconnected_way';
+
+         function isTaggedAsHighway(entity) {
+           return osmRoutableHighwayTagValues[entity.tags.highway];
+         }
+
+         var validation = function checkDisconnectedWay(entity, graph) {
+           var routingIslandWays = routingIslandForEntity(entity);
+           if (!routingIslandWays) return [];
+           return [new validationIssue({
+             type: type,
+             subtype: 'highway',
+             severity: 'warning',
+             message: function message(context) {
+               var entity = this.entityIds.length && context.hasEntity(this.entityIds[0]);
+               var label = entity && utilDisplayLabel(entity, context.graph());
+               return _t.html('issues.disconnected_way.routable.message', {
+                 count: this.entityIds.length,
+                 highway: label
+               });
+             },
+             reference: showReference,
+             entityIds: Array.from(routingIslandWays).map(function (way) {
+               return way.id;
+             }),
+             dynamicFixes: makeFixes
+           })];
+
+           function makeFixes(context) {
+             var fixes = [];
+             var singleEntity = this.entityIds.length === 1 && context.hasEntity(this.entityIds[0]);
+
+             if (singleEntity) {
+               if (singleEntity.type === 'way' && !singleEntity.isClosed()) {
+                 var textDirection = _mainLocalizer.textDirection();
+                 var startFix = makeContinueDrawingFixIfAllowed(textDirection, singleEntity.first(), 'start');
+                 if (startFix) fixes.push(startFix);
+                 var endFix = makeContinueDrawingFixIfAllowed(textDirection, singleEntity.last(), 'end');
+                 if (endFix) fixes.push(endFix);
                }
 
-               return _mapillary;
-           }
+               if (!fixes.length) {
+                 fixes.push(new validationIssueFix({
+                   title: _t.html('issues.fix.connect_feature.title')
+                 }));
+               }
 
+               fixes.push(new validationIssueFix({
+                 icon: 'iD-operation-delete',
+                 title: _t.html('issues.fix.delete_feature.title'),
+                 entityIds: [singleEntity.id],
+                 onClick: function onClick(context) {
+                   var id = this.issue.entityIds[0];
+                   var operation = operationDelete(context, [id]);
 
-           function showLayer() {
-               var service = getService();
-               if (!service) return;
+                   if (!operation.disabled()) {
+                     operation();
+                   }
+                 }
+               }));
+             } else {
+               fixes.push(new validationIssueFix({
+                 title: _t.html('issues.fix.connect_features.title')
+               }));
+             }
 
-               editOn();
+             return fixes;
+           }
 
-               layer
-                   .style('opacity', 0)
-                   .transition()
-                   .duration(250)
-                   .style('opacity', 1)
-                   .on('end', function () { dispatch.call('change'); });
+           function showReference(selection) {
+             selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.disconnected_way.routable.reference'));
            }
 
+           function routingIslandForEntity(entity) {
+             var routingIsland = new Set(); // the interconnected routable features
 
-           function hideLayer() {
-               throttledRedraw.cancel();
+             var waysToCheck = []; // the queue of remaining routable ways to traverse
 
-               layer
-                   .transition()
-                   .duration(250)
-                   .style('opacity', 0)
-                   .on('end', editOff);
-           }
+             function queueParentWays(node) {
+               graph.parentWays(node).forEach(function (parentWay) {
+                 if (!routingIsland.has(parentWay) && // only check each feature once
+                 isRoutableWay(parentWay, false)) {
+                   // only check routable features
+                   routingIsland.add(parentWay);
+                   waysToCheck.push(parentWay);
+                 }
+               });
+             }
 
+             if (entity.type === 'way' && isRoutableWay(entity, true)) {
+               routingIsland.add(entity);
+               waysToCheck.push(entity);
+             } else if (entity.type === 'node' && isRoutableNode(entity)) {
+               routingIsland.add(entity);
+               queueParentWays(entity);
+             } else {
+               // this feature isn't routable, cannot be a routing island
+               return null;
+             }
 
-           function editOn() {
-               layer.style('display', 'block');
-           }
+             while (waysToCheck.length) {
+               var wayToCheck = waysToCheck.pop();
+               var childNodes = graph.childNodes(wayToCheck);
 
+               for (var i in childNodes) {
+                 var vertex = childNodes[i];
 
-           function editOff() {
-               layer.selectAll('.viewfield-group').remove();
-               layer.style('display', 'none');
-           }
+                 if (isConnectedVertex(vertex)) {
+                   // found a link to the wider network, not a routing island
+                   return null;
+                 }
 
+                 if (isRoutableNode(vertex)) {
+                   routingIsland.add(vertex);
+                 }
 
-           function click(d) {
-               var service = getService();
-               if (!service) return;
+                 queueParentWays(vertex);
+               }
+             } // no network link found, this is a routing island, return its members
 
-               service
-                   .selectImage(context, d.key)
-                   .updateViewer(context, d.key)
-                   .showViewer(context);
 
-               context.map().centerEase(d.loc);
+             return routingIsland;
            }
 
+           function isConnectedVertex(vertex) {
+             // assume ways overlapping unloaded tiles are connected to the wider road network  - #5938
+             var osm = services.osm;
+             if (osm && !osm.isDataLoaded(vertex.loc)) return true; // entrances are considered connected
 
-           function mouseover(d) {
-               var service = getService();
-               if (service) service.setStyles(context, d);
+             if (vertex.tags.entrance && vertex.tags.entrance !== 'no') return true;
+             if (vertex.tags.amenity === 'parking_entrance') return true;
+             return false;
            }
 
+           function isRoutableNode(node) {
+             // treat elevators as distinct features in the highway network
+             if (node.tags.highway === 'elevator') return true;
+             return false;
+           }
 
-           function mouseout() {
-               var service = getService();
-               if (service) service.setStyles(context, null);
+           function isRoutableWay(way, ignoreInnerWays) {
+             if (isTaggedAsHighway(way) || way.tags.route === 'ferry') return true;
+             return graph.parentRelations(way).some(function (parentRelation) {
+               if (parentRelation.tags.type === 'route' && parentRelation.tags.route === 'ferry') return true;
+               if (parentRelation.isMultipolygon() && isTaggedAsHighway(parentRelation) && (!ignoreInnerWays || parentRelation.memberById(way.id).role !== 'inner')) return true;
+               return false;
+             });
            }
 
+           function makeContinueDrawingFixIfAllowed(textDirection, vertexID, whichEnd) {
+             var vertex = graph.hasEntity(vertexID);
+             if (!vertex || vertex.tags.noexit === 'yes') return null;
+             var useLeftContinue = whichEnd === 'start' && textDirection === 'ltr' || whichEnd === 'end' && textDirection === 'rtl';
+             return new validationIssueFix({
+               icon: 'iD-operation-continue' + (useLeftContinue ? '-left' : ''),
+               title: _t.html('issues.fix.continue_from_' + whichEnd + '.title'),
+               entityIds: [vertexID],
+               onClick: function onClick(context) {
+                 var wayId = this.issue.entityIds[0];
+                 var way = context.hasEntity(wayId);
+                 var vertexId = this.entityIds[0];
+                 var vertex = context.hasEntity(vertexId);
+                 if (!way || !vertex) return; // make sure the vertex is actually visible and editable
+
+                 var map = context.map();
+
+                 if (!context.editable() || !map.trimmedExtent().contains(vertex.loc)) {
+                   map.zoomToEase(vertex);
+                 }
 
-           function transform(d) {
-               var t = svgPointTransform(projection)(d);
-               if (d.pano && viewerCompassAngle !== null && isFinite(viewerCompassAngle)) {
-                   t += ' rotate(' + Math.floor(viewerCompassAngle) + ',0,0)';
-               } else if (d.ca) {
-                   t += ' rotate(' + Math.floor(d.ca) + ',0,0)';
+                 context.enter(modeDrawLine(context, wayId, context.graph(), 'line', way.affix(vertexId), true));
                }
-               return t;
+             });
            }
+         };
+
+         validation.type = type;
+         return validation;
+       }
 
-           context.photos().on('change.mapillary_images', update);
+       function validationFormatting() {
+         var type = 'invalid_format';
 
-           function filterImages(images) {
-               var showsPano = context.photos().showsPanoramic();
-               var showsFlat = context.photos().showsFlat();
-               if (!showsPano || !showsFlat) {
-                   images = images.filter(function(image) {
-                       if (image.pano) return showsPano;
-                       return showsFlat;
-                   });
-               }
-               return images;
-           }
-
-           function filterSequences(sequences, service) {
-               var showsPano = context.photos().showsPanoramic();
-               var showsFlat = context.photos().showsFlat();
-               if (!showsPano || !showsFlat) {
-                   sequences = sequences.filter(function(sequence) {
-                       if (sequence.properties.hasOwnProperty('pano')) {
-                           if (sequence.properties.pano) return showsPano;
-                           return showsFlat;
-                       } else {
-                           // if the sequence doesn't specify pano or not, search its images
-                           var cProps = sequence.properties.coordinateProperties;
-                           if (cProps && cProps.image_keys && cProps.image_keys.length > 0) {
-                               for (var index in cProps.image_keys) {
-                                   var imageKey = cProps.image_keys[index];
-                                   var image = service.cachedImage(imageKey);
-                                   if (image && image.hasOwnProperty('pano')) {
-                                       if (image.pano) return showsPano;
-                                       return showsFlat;
-                                   }
-                               }
-                           }
-                       }
-                   });
-               }
-               return sequences;
+         var validation = function validation(entity) {
+           var issues = [];
+
+           function isValidEmail(email) {
+             // Emails in OSM are going to be official so they should be pretty simple
+             // Using negated lists to better support all possible unicode characters (#6494)
+             var valid_email = /^[^\(\)\\,":;<>@\[\]]+@[^\(\)\\,":;<>@\[\]\.]+(?:\.[a-z0-9-]+)*$/i; // An empty value is also acceptable
+
+             return !email || valid_email.test(email);
+           }
+           /*
+           function isSchemePresent(url) {
+               var valid_scheme = /^https?:\/\//i;
+               return (!url || valid_scheme.test(url));
            }
+           */
 
-           function update() {
 
-               var z = ~~context.map().zoom();
-               var showMarkers = (z >= minMarkerZoom);
-               var showViewfields = (z >= minViewfieldZoom);
-
-               var service = getService();
-               var selectedKey = service && service.getSelectedImageKey();
-               var sequences = (service ? service.sequences(projection) : []);
-               var images = (service && showMarkers ? service.images(projection) : []);
-
-               images = filterImages(images);
-               sequences = filterSequences(sequences, service);
-
-               var traces = layer.selectAll('.sequences').selectAll('.sequence')
-                   .data(sequences, function(d) { return d.properties.key; });
-
-               // exit
-               traces.exit()
-                   .remove();
-
-               // enter/update
-               traces = traces.enter()
-                   .append('path')
-                   .attr('class', 'sequence')
-                   .merge(traces)
-                   .attr('d', svgPath(projection).geojson);
-
-
-               var groups = layer.selectAll('.markers').selectAll('.viewfield-group')
-                   .data(images, function(d) { return d.key; });
-
-               // exit
-               groups.exit()
-                   .remove();
-
-               // enter
-               var groupsEnter = groups.enter()
-                   .append('g')
-                   .attr('class', 'viewfield-group')
-                   .on('mouseenter', mouseover)
-                   .on('mouseleave', mouseout)
-                   .on('click', click);
-
-               groupsEnter
-                   .append('g')
-                   .attr('class', 'viewfield-scale');
-
-               // update
-               var markers = groups
-                   .merge(groupsEnter)
-                   .sort(function(a, b) {
-                       return (a.key === selectedKey) ? 1
-                           : (b.key === selectedKey) ? -1
-                           : b.loc[1] - a.loc[1];  // sort Y
-                   })
-                   .attr('transform', transform)
-                   .select('.viewfield-scale');
-
-
-               markers.selectAll('circle')
+           function showReferenceEmail(selection) {
+             selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.invalid_format.email.reference'));
+           }
+           /*
+           function showReferenceWebsite(selection) {
+               selection.selectAll('.issue-reference')
                    .data([0])
                    .enter()
-                   .append('circle')
-                   .attr('dx', '0')
-                   .attr('dy', '0')
-                   .attr('r', '6');
-
-               var viewfields = markers.selectAll('.viewfield')
-                   .data(showViewfields ? [0] : []);
-
-               viewfields.exit()
-                   .remove();
-
-               viewfields.enter()               // viewfields may or may not be drawn...
-                   .insert('path', 'circle')    // but if they are, draw below the circles
-                   .attr('class', 'viewfield')
-                   .classed('pano', function() { return this.parentNode.__data__.pano; })
-                   .attr('transform', 'scale(1.5,1.5),translate(-8, -13)')
-                   .attr('d', viewfieldPath);
-
-               function viewfieldPath() {
-                   var d = this.parentNode.__data__;
-                   if (d.pano) {
-                       return 'M 8,13 m -10,0 a 10,10 0 1,0 20,0 a 10,10 0 1,0 -20,0';
-                   } else {
-                       return 'M 6,9 C 8,8.4 8,8.4 10,9 L 16,-2 C 12,-5 4,-5 0,-2 z';
-                   }
+                   .append('div')
+                   .attr('class', 'issue-reference')
+                   .html(t.html('issues.invalid_format.website.reference'));
+           }
+            if (entity.tags.website) {
+               // Multiple websites are possible
+               // If ever we support ES6, arrow functions make this nicer
+               var websites = entity.tags.website
+                   .split(';')
+                   .map(function(s) { return s.trim(); })
+                   .filter(function(x) { return !isSchemePresent(x); });
+                if (websites.length) {
+                   issues.push(new validationIssue({
+                       type: type,
+                       subtype: 'website',
+                       severity: 'warning',
+                       message: function(context) {
+                           var entity = context.hasEntity(this.entityIds[0]);
+                           return entity ? t.html('issues.invalid_format.website.message' + this.data,
+                               { feature: utilDisplayLabel(entity, context.graph()), site: websites.join(', ') }) : '';
+                       },
+                       reference: showReferenceWebsite,
+                       entityIds: [entity.id],
+                       hash: websites.join(),
+                       data: (websites.length > 1) ? '_multi' : ''
+                   }));
                }
            }
+           */
 
 
-           function drawImages(selection) {
-               var enabled = svgMapillaryImages.enabled;
-               var service = getService();
+           if (entity.tags.email) {
+             // Multiple emails are possible
+             var emails = entity.tags.email.split(';').map(function (s) {
+               return s.trim();
+             }).filter(function (x) {
+               return !isValidEmail(x);
+             });
 
-               layer = selection.selectAll('.layer-mapillary')
-                   .data(service ? [0] : []);
+             if (emails.length) {
+               issues.push(new validationIssue({
+                 type: type,
+                 subtype: 'email',
+                 severity: 'warning',
+                 message: function message(context) {
+                   var entity = context.hasEntity(this.entityIds[0]);
+                   return entity ? _t.html('issues.invalid_format.email.message' + this.data, {
+                     feature: utilDisplayLabel(entity, context.graph()),
+                     email: emails.join(', ')
+                   }) : '';
+                 },
+                 reference: showReferenceEmail,
+                 entityIds: [entity.id],
+                 hash: emails.join(),
+                 data: emails.length > 1 ? '_multi' : ''
+               }));
+             }
+           }
 
-               layer.exit()
-                   .remove();
+           return issues;
+         };
 
-               var layerEnter = layer.enter()
-                   .append('g')
-                   .attr('class', 'layer-mapillary')
-                   .style('display', enabled ? 'block' : 'none');
+         validation.type = type;
+         return validation;
+       }
 
-               layerEnter
-                   .append('g')
-                   .attr('class', 'sequences');
+       function validationHelpRequest(context) {
+         var type = 'help_request';
 
-               layerEnter
-                   .append('g')
-                   .attr('class', 'markers');
+         var validation = function checkFixmeTag(entity) {
+           if (!entity.tags.fixme) return []; // don't flag fixmes on features added by the user
 
-               layer = layerEnter
-                   .merge(layer);
+           if (entity.version === undefined) return [];
 
-               if (enabled) {
-                   if (service && ~~context.map().zoom() >= minZoom) {
-                       editOn();
-                       update();
-                       service.loadImages(projection);
-                   } else {
-                       editOff();
-                   }
-               }
+           if (entity.v !== undefined) {
+             var baseEntity = context.history().base().hasEntity(entity.id); // don't flag fixmes added by the user on existing features
+
+             if (!baseEntity || !baseEntity.tags.fixme) return [];
            }
 
+           return [new validationIssue({
+             type: type,
+             subtype: 'fixme_tag',
+             severity: 'warning',
+             message: function message(context) {
+               var entity = context.hasEntity(this.entityIds[0]);
+               return entity ? _t.html('issues.fixme_tag.message', {
+                 feature: utilDisplayLabel(entity, context.graph())
+               }) : '';
+             },
+             dynamicFixes: function dynamicFixes() {
+               return [new validationIssueFix({
+                 title: _t.html('issues.fix.address_the_concern.title')
+               })];
+             },
+             reference: showReference,
+             entityIds: [entity.id]
+           })];
 
-           drawImages.enabled = function(_) {
-               if (!arguments.length) return svgMapillaryImages.enabled;
-               svgMapillaryImages.enabled = _;
-               if (svgMapillaryImages.enabled) {
-                   showLayer();
-               } else {
-                   hideLayer();
-               }
-               dispatch.call('change');
-               return this;
-           };
+           function showReference(selection) {
+             selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.fixme_tag.reference'));
+           }
+         };
 
+         validation.type = type;
+         return validation;
+       }
 
-           drawImages.supported = function() {
-               return !!getService();
-           };
+       function validationImpossibleOneway() {
+         var type = 'impossible_oneway';
+
+         var validation = function checkImpossibleOneway(entity, graph) {
+           if (entity.type !== 'way' || entity.geometry(graph) !== 'line') return [];
+           if (entity.isClosed()) return [];
+           if (!typeForWay(entity)) return [];
+           if (!isOneway(entity)) return [];
+           var firstIssues = issuesForNode(entity, entity.first());
+           var lastIssues = issuesForNode(entity, entity.last());
+           return firstIssues.concat(lastIssues);
+
+           function typeForWay(way) {
+             if (way.geometry(graph) !== 'line') return null;
+             if (osmRoutableHighwayTagValues[way.tags.highway]) return 'highway';
+             if (osmFlowingWaterwayTagValues[way.tags.waterway]) return 'waterway';
+             return null;
+           }
 
+           function isOneway(way) {
+             if (way.tags.oneway === 'yes') return true;
+             if (way.tags.oneway) return false;
 
-           init();
-           return drawImages;
-       }
+             for (var key in way.tags) {
+               if (osmOneWayTags[key] && osmOneWayTags[key][way.tags[key]]) {
+                 return true;
+               }
+             }
 
-       function svgMapillarySigns(projection, context, dispatch) {
-           var throttledRedraw = throttle(function () { dispatch.call('change'); }, 1000);
-           var minZoom = 12;
-           var layer = select(null);
-           var _mapillary;
+             return false;
+           }
 
+           function nodeOccursMoreThanOnce(way, nodeID) {
+             var occurrences = 0;
+
+             for (var index in way.nodes) {
+               if (way.nodes[index] === nodeID) {
+                 occurrences += 1;
+                 if (occurrences > 1) return true;
+               }
+             }
 
-           function init() {
-               if (svgMapillarySigns.initialized) return;  // run once
-               svgMapillarySigns.enabled = false;
-               svgMapillarySigns.initialized = true;
+             return false;
            }
 
+           function isConnectedViaOtherTypes(way, node) {
+             var wayType = typeForWay(way);
 
-           function getService() {
-               if (services.mapillary && !_mapillary) {
-                   _mapillary = services.mapillary;
-                   _mapillary.event.on('loadedSigns', throttledRedraw);
-               } else if (!services.mapillary && _mapillary) {
-                   _mapillary = null;
+             if (wayType === 'highway') {
+               // entrances are considered connected
+               if (node.tags.entrance && node.tags.entrance !== 'no') return true;
+               if (node.tags.amenity === 'parking_entrance') return true;
+             } else if (wayType === 'waterway') {
+               if (node.id === way.first()) {
+                 // multiple waterways may start at the same spring
+                 if (node.tags.natural === 'spring') return true;
+               } else {
+                 // multiple waterways may end at the same drain
+                 if (node.tags.manhole === 'drain') return true;
                }
-               return _mapillary;
-           }
+             }
 
+             return graph.parentWays(node).some(function (parentWay) {
+               if (parentWay.id === way.id) return false;
 
-           function showLayer() {
-               var service = getService();
-               if (!service) return;
+               if (wayType === 'highway') {
+                 // allow connections to highway areas
+                 if (parentWay.geometry(graph) === 'area' && osmRoutableHighwayTagValues[parentWay.tags.highway]) return true; // count connections to ferry routes as connected
 
-               editOn();
-           }
+                 if (parentWay.tags.route === 'ferry') return true;
+                 return graph.parentRelations(parentWay).some(function (parentRelation) {
+                   if (parentRelation.tags.type === 'route' && parentRelation.tags.route === 'ferry') return true; // allow connections to highway multipolygons
 
+                   return parentRelation.isMultipolygon() && osmRoutableHighwayTagValues[parentRelation.tags.highway];
+                 });
+               } else if (wayType === 'waterway') {
+                 // multiple waterways may start or end at a water body at the same node
+                 if (parentWay.tags.natural === 'water' || parentWay.tags.natural === 'coastline') return true;
+               }
 
-           function hideLayer() {
-               throttledRedraw.cancel();
-               editOff();
+               return false;
+             });
            }
 
+           function issuesForNode(way, nodeID) {
+             var isFirst = nodeID === way.first();
+             var wayType = typeForWay(way); // ignore if this way is self-connected at this node
 
-           function editOn() {
-               layer.style('display', 'block');
-           }
+             if (nodeOccursMoreThanOnce(way, nodeID)) return [];
+             var osm = services.osm;
+             if (!osm) return [];
+             var node = graph.hasEntity(nodeID); // ignore if this node or its tile are unloaded
 
+             if (!node || !osm.isDataLoaded(node.loc)) return [];
+             if (isConnectedViaOtherTypes(way, node)) return [];
+             var attachedWaysOfSameType = graph.parentWays(node).filter(function (parentWay) {
+               if (parentWay.id === way.id) return false;
+               return typeForWay(parentWay) === wayType;
+             }); // assume it's okay for waterways to start or end disconnected for now
 
-           function editOff() {
-               layer.selectAll('.icon-sign').remove();
-               layer.style('display', 'none');
-           }
+             if (wayType === 'waterway' && attachedWaysOfSameType.length === 0) return [];
+             var attachedOneways = attachedWaysOfSameType.filter(function (attachedWay) {
+               return isOneway(attachedWay);
+             }); // ignore if the way is connected to some non-oneway features
 
+             if (attachedOneways.length < attachedWaysOfSameType.length) return [];
+
+             if (attachedOneways.length) {
+               var connectedEndpointsOkay = attachedOneways.some(function (attachedOneway) {
+                 if ((isFirst ? attachedOneway.first() : attachedOneway.last()) !== nodeID) return true;
+                 if (nodeOccursMoreThanOnce(attachedOneway, nodeID)) return true;
+                 return false;
+               });
+               if (connectedEndpointsOkay) return [];
+             }
 
-           function click(d) {
-               var service = getService();
-               if (!service) return;
+             var placement = isFirst ? 'start' : 'end',
+                 messageID = wayType + '.',
+                 referenceID = wayType + '.';
 
-               context.map().centerEase(d.loc);
+             if (wayType === 'waterway') {
+               messageID += 'connected.' + placement;
+               referenceID += 'connected';
+             } else {
+               messageID += placement;
+               referenceID += placement;
+             }
 
-               var selectedImageKey = service.getSelectedImageKey();
-               var imageKey;
+             return [new validationIssue({
+               type: type,
+               subtype: wayType,
+               severity: 'warning',
+               message: function message(context) {
+                 var entity = context.hasEntity(this.entityIds[0]);
+                 return entity ? _t.html('issues.impossible_oneway.' + messageID + '.message', {
+                   feature: utilDisplayLabel(entity, context.graph())
+                 }) : '';
+               },
+               reference: getReference(referenceID),
+               entityIds: [way.id, node.id],
+               dynamicFixes: function dynamicFixes() {
+                 var fixes = [];
 
-               // Pick one of the images the sign was detected in,
-               // preference given to an image already selected.
-               d.detections.forEach(function(detection) {
-                   if (!imageKey || selectedImageKey === detection.image_key) {
-                       imageKey = detection.image_key;
-                   }
-               });
+                 if (attachedOneways.length) {
+                   fixes.push(new validationIssueFix({
+                     icon: 'iD-operation-reverse',
+                     title: _t.html('issues.fix.reverse_feature.title'),
+                     entityIds: [way.id],
+                     onClick: function onClick(context) {
+                       var id = this.issue.entityIds[0];
+                       context.perform(actionReverse(id), _t('operations.reverse.annotation.line', {
+                         n: 1
+                       }));
+                     }
+                   }));
+                 }
 
-               service
-                   .selectImage(context, imageKey)
-                   .updateViewer(context, imageKey)
-                   .showViewer(context);
-           }
+                 if (node.tags.noexit !== 'yes') {
+                   var textDirection = _mainLocalizer.textDirection();
+                   var useLeftContinue = isFirst && textDirection === 'ltr' || !isFirst && textDirection === 'rtl';
+                   fixes.push(new validationIssueFix({
+                     icon: 'iD-operation-continue' + (useLeftContinue ? '-left' : ''),
+                     title: _t.html('issues.fix.continue_from_' + (isFirst ? 'start' : 'end') + '.title'),
+                     onClick: function onClick(context) {
+                       var entityID = this.issue.entityIds[0];
+                       var vertexID = this.issue.entityIds[1];
+                       var way = context.entity(entityID);
+                       var vertex = context.entity(vertexID);
+                       continueDrawing(way, vertex, context);
+                     }
+                   }));
+                 }
 
+                 return fixes;
+               },
+               loc: node.loc
+             })];
 
-           function update() {
-               var service = getService();
-               var data = (service ? service.signs(projection) : []);
-               var selectedImageKey = service.getSelectedImageKey();
-               var transform = svgPointTransform(projection);
-
-               var signs = layer.selectAll('.icon-sign')
-                   .data(data, function(d) { return d.key; });
-
-               // exit
-               signs.exit()
-                   .remove();
-
-               // enter
-               var enter = signs.enter()
-                   .append('g')
-                   .attr('class', 'icon-sign icon-detected')
-                   .on('click', click);
-
-               enter
-                   .append('use')
-                   .attr('width', '24px')
-                   .attr('height', '24px')
-                   .attr('x', '-12px')
-                   .attr('y', '-12px')
-                   .attr('xlink:href', function(d) { return '#' + d.value; });
-
-               enter
-                   .append('rect')
-                   .attr('width', '24px')
-                   .attr('height', '24px')
-                   .attr('x', '-12px')
-                   .attr('y', '-12px');
-
-               // update
-               signs
-                   .merge(enter)
-                   .attr('transform', transform)
-                   .classed('currentView', function(d) {
-                       return d.detections.some(function(detection) {
-                           return detection.image_key === selectedImageKey;
-                       });
-                   })
-                   .sort(function(a, b) {
-                       var aSelected = a.detections.some(function(detection) {
-                           return detection.image_key === selectedImageKey;
-                       });
-                       var bSelected = b.detections.some(function(detection) {
-                           return detection.image_key === selectedImageKey;
-                       });
-                       if (aSelected === bSelected) {
-                           return b.loc[1] - a.loc[1]; // sort Y
-                       } else if (aSelected) {
-                           return 1;
-                       }
-                       return -1;
-                   });
+             function getReference(referenceID) {
+               return function showReference(selection) {
+                 selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.impossible_oneway.' + referenceID + '.reference'));
+               };
+             }
            }
+         };
 
+         function continueDrawing(way, vertex, context) {
+           // make sure the vertex is actually visible and editable
+           var map = context.map();
 
-           function drawSigns(selection) {
-               var enabled = svgMapillarySigns.enabled;
-               var service = getService();
-
-               layer = selection.selectAll('.layer-mapillary-signs')
-                   .data(service ? [0] : []);
+           if (!context.editable() || !map.trimmedExtent().contains(vertex.loc)) {
+             map.zoomToEase(vertex);
+           }
 
-               layer.exit()
-                   .remove();
+           context.enter(modeDrawLine(context, way.id, context.graph(), 'line', way.affix(vertex.id), true));
+         }
 
-               layer = layer.enter()
-                   .append('g')
-                   .attr('class', 'layer-mapillary-signs layer-mapillary-detections')
-                   .style('display', enabled ? 'block' : 'none')
-                   .merge(layer);
+         validation.type = type;
+         return validation;
+       }
 
-               if (enabled) {
-                   if (service && ~~context.map().zoom() >= minZoom) {
-                       editOn();
-                       update();
-                       service.loadSigns(projection);
-                   } else {
-                       editOff();
-                   }
+       function validationIncompatibleSource() {
+         var type = 'incompatible_source';
+         var invalidSources = [{
+           id: 'google',
+           regex: 'google',
+           exceptRegex: 'books.google|Google Books|drive.google|googledrive|Google Drive'
+         }];
+
+         var validation = function checkIncompatibleSource(entity) {
+           var entitySources = entity.tags && entity.tags.source && entity.tags.source.split(';');
+           if (!entitySources) return [];
+           var issues = [];
+           invalidSources.forEach(function (invalidSource) {
+             var hasInvalidSource = entitySources.some(function (source) {
+               if (!source.match(new RegExp(invalidSource.regex, 'i'))) return false;
+               if (invalidSource.exceptRegex && source.match(new RegExp(invalidSource.exceptRegex, 'i'))) return false;
+               return true;
+             });
+             if (!hasInvalidSource) return;
+             issues.push(new validationIssue({
+               type: type,
+               severity: 'warning',
+               message: function message(context) {
+                 var entity = context.hasEntity(this.entityIds[0]);
+                 return entity ? _t.html('issues.incompatible_source.' + invalidSource.id + '.feature.message', {
+                   feature: utilDisplayLabel(entity, context.graph())
+                 }) : '';
+               },
+               reference: getReference(invalidSource.id),
+               entityIds: [entity.id],
+               dynamicFixes: function dynamicFixes() {
+                 return [new validationIssueFix({
+                   title: _t.html('issues.fix.remove_proprietary_data.title')
+                 })];
                }
+             }));
+           });
+           return issues;
+
+           function getReference(id) {
+             return function showReference(selection) {
+               selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.incompatible_source.' + id + '.reference'));
+             };
            }
+         };
 
+         validation.type = type;
+         return validation;
+       }
 
-           drawSigns.enabled = function(_) {
-               if (!arguments.length) return svgMapillarySigns.enabled;
-               svgMapillarySigns.enabled = _;
-               if (svgMapillarySigns.enabled) {
-                   showLayer();
-               } else {
-                   hideLayer();
-               }
-               dispatch.call('change');
-               return this;
-           };
+       function validationMaprules() {
+         var type = 'maprules';
 
+         var validation = function checkMaprules(entity, graph) {
+           if (!services.maprules) return [];
+           var rules = services.maprules.validationRules();
+           var issues = [];
 
-           drawSigns.supported = function() {
-               return !!getService();
-           };
+           for (var i = 0; i < rules.length; i++) {
+             var rule = rules[i];
+             rule.findIssues(entity, graph, issues);
+           }
 
+           return issues;
+         };
 
-           init();
-           return drawSigns;
+         validation.type = type;
+         return validation;
        }
 
-       function svgMapillaryMapFeatures(projection, context, dispatch) {
-           var throttledRedraw = throttle(function () { dispatch.call('change'); }, 1000);
-           var minZoom = 12;
-           var layer = select(null);
-           var _mapillary;
+       function validationMismatchedGeometry() {
+         var type = 'mismatched_geometry';
 
+         function tagSuggestingLineIsArea(entity) {
+           if (entity.type !== 'way' || entity.isClosed()) return null;
+           var tagSuggestingArea = entity.tagSuggestingArea();
 
-           function init() {
-               if (svgMapillaryMapFeatures.initialized) return;  // run once
-               svgMapillaryMapFeatures.enabled = false;
-               svgMapillaryMapFeatures.initialized = true;
+           if (!tagSuggestingArea) {
+             return null;
            }
 
+           var asLine = _mainPresetIndex.matchTags(tagSuggestingArea, 'line');
+           var asArea = _mainPresetIndex.matchTags(tagSuggestingArea, 'area');
 
-           function getService() {
-               if (services.mapillary && !_mapillary) {
-                   _mapillary = services.mapillary;
-                   _mapillary.event.on('loadedMapFeatures', throttledRedraw);
-               } else if (!services.mapillary && _mapillary) {
-                   _mapillary = null;
-               }
-               return _mapillary;
+           if (asLine && asArea && asLine === asArea) {
+             // these tags also allow lines and making this an area wouldn't matter
+             return null;
            }
 
+           return tagSuggestingArea;
+         }
 
-           function showLayer() {
-               var service = getService();
-               if (!service) return;
+         function makeConnectEndpointsFixOnClick(way, graph) {
+           // must have at least three nodes to close this automatically
+           if (way.nodes.length < 3) return null;
+           var nodes = graph.childNodes(way),
+               testNodes;
+           var firstToLastDistanceMeters = geoSphericalDistance(nodes[0].loc, nodes[nodes.length - 1].loc); // if the distance is very small, attempt to merge the endpoints
 
-               editOn();
-           }
+           if (firstToLastDistanceMeters < 0.75) {
+             testNodes = nodes.slice(); // shallow copy
 
+             testNodes.pop();
+             testNodes.push(testNodes[0]); // make sure this will not create a self-intersection
 
-           function hideLayer() {
-               throttledRedraw.cancel();
-               editOff();
-           }
+             if (!geoHasSelfIntersections(testNodes, testNodes[0].id)) {
+               return function (context) {
+                 var way = context.entity(this.issue.entityIds[0]);
+                 context.perform(actionMergeNodes([way.nodes[0], way.nodes[way.nodes.length - 1]], nodes[0].loc), _t('issues.fix.connect_endpoints.annotation'));
+               };
+             }
+           } // if the points were not merged, attempt to close the way
 
 
-           function editOn() {
-               layer.style('display', 'block');
-           }
+           testNodes = nodes.slice(); // shallow copy
 
+           testNodes.push(testNodes[0]); // make sure this will not create a self-intersection
 
-           function editOff() {
-               layer.selectAll('.icon-map-feature').remove();
-               layer.style('display', 'none');
+           if (!geoHasSelfIntersections(testNodes, testNodes[0].id)) {
+             return function (context) {
+               var wayId = this.issue.entityIds[0];
+               var way = context.entity(wayId);
+               var nodeId = way.nodes[0];
+               var index = way.nodes.length;
+               context.perform(actionAddVertex(wayId, nodeId, index), _t('issues.fix.connect_endpoints.annotation'));
+             };
            }
+         }
+
+         function lineTaggedAsAreaIssue(entity) {
+           var tagSuggestingArea = tagSuggestingLineIsArea(entity);
+           if (!tagSuggestingArea) return null;
+           return new validationIssue({
+             type: type,
+             subtype: 'area_as_line',
+             severity: 'warning',
+             message: function message(context) {
+               var entity = context.hasEntity(this.entityIds[0]);
+               return entity ? _t.html('issues.tag_suggests_area.message', {
+                 feature: utilDisplayLabel(entity, 'area'),
+                 tag: utilTagText({
+                   tags: tagSuggestingArea
+                 })
+               }) : '';
+             },
+             reference: showReference,
+             entityIds: [entity.id],
+             hash: JSON.stringify(tagSuggestingArea),
+             dynamicFixes: function dynamicFixes(context) {
+               var fixes = [];
+               var entity = context.entity(this.entityIds[0]);
+               var connectEndsOnClick = makeConnectEndpointsFixOnClick(entity, context.graph());
+               fixes.push(new validationIssueFix({
+                 title: _t.html('issues.fix.connect_endpoints.title'),
+                 onClick: connectEndsOnClick
+               }));
+               fixes.push(new validationIssueFix({
+                 icon: 'iD-operation-delete',
+                 title: _t.html('issues.fix.remove_tag.title'),
+                 onClick: function onClick(context) {
+                   var entityId = this.issue.entityIds[0];
+                   var entity = context.entity(entityId);
+                   var tags = Object.assign({}, entity.tags); // shallow copy
+
+                   for (var key in tagSuggestingArea) {
+                     delete tags[key];
+                   }
+
+                   context.perform(actionChangeTags(entityId, tags), _t('issues.fix.remove_tag.annotation'));
+                 }
+               }));
+               return fixes;
+             }
+           });
 
+           function showReference(selection) {
+             selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.tag_suggests_area.reference'));
+           }
+         }
 
-           function click(d) {
-               var service = getService();
-               if (!service) return;
+         function vertexTaggedAsPointIssue(entity, graph) {
+           // we only care about nodes
+           if (entity.type !== 'node') return null; // ignore tagless points
 
-               context.map().centerEase(d.loc);
+           if (Object.keys(entity.tags).length === 0) return null; // address lines are special so just ignore them
 
-               var selectedImageKey = service.getSelectedImageKey();
-               var imageKey;
+           if (entity.isOnAddressLine(graph)) return null;
+           var geometry = entity.geometry(graph);
+           var allowedGeometries = osmNodeGeometriesForTags(entity.tags);
 
-               // Pick one of the images the map feature was detected in,
-               // preference given to an image already selected.
-               d.detections.forEach(function(detection) {
-                   if (!imageKey || selectedImageKey === detection.image_key) {
-                       imageKey = detection.image_key;
-                   }
-               });
+           if (geometry === 'point' && !allowedGeometries.point && allowedGeometries.vertex) {
+             return new validationIssue({
+               type: type,
+               subtype: 'vertex_as_point',
+               severity: 'warning',
+               message: function message(context) {
+                 var entity = context.hasEntity(this.entityIds[0]);
+                 return entity ? _t.html('issues.vertex_as_point.message', {
+                   feature: utilDisplayLabel(entity, 'vertex')
+                 }) : '';
+               },
+               reference: function showReference(selection) {
+                 selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.vertex_as_point.reference'));
+               },
+               entityIds: [entity.id]
+             });
+           } else if (geometry === 'vertex' && !allowedGeometries.vertex && allowedGeometries.point) {
+             return new validationIssue({
+               type: type,
+               subtype: 'point_as_vertex',
+               severity: 'warning',
+               message: function message(context) {
+                 var entity = context.hasEntity(this.entityIds[0]);
+                 return entity ? _t.html('issues.point_as_vertex.message', {
+                   feature: utilDisplayLabel(entity, 'point')
+                 }) : '';
+               },
+               reference: function showReference(selection) {
+                 selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.point_as_vertex.reference'));
+               },
+               entityIds: [entity.id],
+               dynamicFixes: function dynamicFixes(context) {
+                 var entityId = this.entityIds[0];
+                 var extractOnClick = null;
+
+                 if (!context.hasHiddenConnections(entityId)) {
+                   extractOnClick = function extractOnClick(context) {
+                     var entityId = this.issue.entityIds[0];
+                     var action = actionExtract(entityId);
+                     context.perform(action, _t('operations.extract.annotation', {
+                       n: 1
+                     })); // re-enter mode to trigger updates
+
+                     context.enter(modeSelect(context, [action.getExtractedNodeID()]));
+                   };
+                 }
 
-               service
-                   .selectImage(context, imageKey)
-                   .updateViewer(context, imageKey)
-                   .showViewer(context);
+                 return [new validationIssueFix({
+                   icon: 'iD-operation-extract',
+                   title: _t.html('issues.fix.extract_point.title'),
+                   onClick: extractOnClick
+                 })];
+               }
+             });
            }
 
+           return null;
+         }
 
-           function update() {
-               var service = getService();
-               var data = (service ? service.mapFeatures(projection) : []);
-               var selectedImageKey = service && service.getSelectedImageKey();
-               var transform = svgPointTransform(projection);
-
-               var mapFeatures = layer.selectAll('.icon-map-feature')
-                   .data(data, function(d) { return d.key; });
-
-               // exit
-               mapFeatures.exit()
-                   .remove();
-
-               // enter
-               var enter = mapFeatures.enter()
-                   .append('g')
-                   .attr('class', 'icon-map-feature icon-detected')
-                   .on('click', click);
-
-               enter
-                   .append('title')
-                   .text(function(d) {
-                       var id = d.value.replace(/--/g, '.').replace(/-/g, '_');
-                       return _t('mapillary_map_features.' + id);
-                   });
+         function unclosedMultipolygonPartIssues(entity, graph) {
+           if (entity.type !== 'relation' || !entity.isMultipolygon() || entity.isDegenerate() || // cannot determine issues for incompletely-downloaded relations
+           !entity.isComplete(graph)) return null;
+           var sequences = osmJoinWays(entity.members, graph);
+           var issues = [];
 
-               enter
-                   .append('use')
-                   .attr('width', '24px')
-                   .attr('height', '24px')
-                   .attr('x', '-12px')
-                   .attr('y', '-12px')
-                   .attr('xlink:href', function(d) {
-                       if (d.value === 'object--billboard') {
-                           // no billboard icon right now, so use the advertisement icon
-                           return '#object--sign--advertisement';
-                       }
-                       return '#' + d.value;
-                   });
+           for (var i in sequences) {
+             var sequence = sequences[i];
+             if (!sequence.nodes) continue;
+             var firstNode = sequence.nodes[0];
+             var lastNode = sequence.nodes[sequence.nodes.length - 1]; // part is closed if the first and last nodes are the same
 
-               enter
-                   .append('rect')
-                   .attr('width', '24px')
-                   .attr('height', '24px')
-                   .attr('x', '-12px')
-                   .attr('y', '-12px');
-
-               // update
-               mapFeatures
-                   .merge(enter)
-                   .attr('transform', transform)
-                   .classed('currentView', function(d) {
-                       return d.detections.some(function(detection) {
-                           return detection.image_key === selectedImageKey;
-                       });
-                   })
-                   .sort(function(a, b) {
-                       var aSelected = a.detections.some(function(detection) {
-                           return detection.image_key === selectedImageKey;
-                       });
-                       var bSelected = b.detections.some(function(detection) {
-                           return detection.image_key === selectedImageKey;
-                       });
-                       if (aSelected === bSelected) {
-                           return b.loc[1] - a.loc[1]; // sort Y
-                       } else if (aSelected) {
-                           return 1;
-                       }
-                       return -1;
-                   });
+             if (firstNode === lastNode) continue;
+             var issue = new validationIssue({
+               type: type,
+               subtype: 'unclosed_multipolygon_part',
+               severity: 'warning',
+               message: function message(context) {
+                 var entity = context.hasEntity(this.entityIds[0]);
+                 return entity ? _t.html('issues.unclosed_multipolygon_part.message', {
+                   feature: utilDisplayLabel(entity, context.graph())
+                 }) : '';
+               },
+               reference: showReference,
+               loc: sequence.nodes[0].loc,
+               entityIds: [entity.id],
+               hash: sequence.map(function (way) {
+                 return way.id;
+               }).join()
+             });
+             issues.push(issue);
            }
 
+           return issues;
+
+           function showReference(selection) {
+             selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.unclosed_multipolygon_part.reference'));
+           }
+         }
+
+         var validation = function checkMismatchedGeometry(entity, graph) {
+           var issues = [vertexTaggedAsPointIssue(entity, graph), lineTaggedAsAreaIssue(entity)];
+           issues = issues.concat(unclosedMultipolygonPartIssues(entity, graph));
+           return issues.filter(Boolean);
+         };
+
+         validation.type = type;
+         return validation;
+       }
 
-           function drawMapFeatures(selection) {
-               var enabled = svgMapillaryMapFeatures.enabled;
-               var service = getService();
+       function validationMissingRole() {
+         var type = 'missing_role';
 
-               layer = selection.selectAll('.layer-mapillary-map-features')
-                   .data(service ? [0] : []);
+         var validation = function checkMissingRole(entity, graph) {
+           var issues = [];
 
-               layer.exit()
-                   .remove();
+           if (entity.type === 'way') {
+             graph.parentRelations(entity).forEach(function (relation) {
+               if (!relation.isMultipolygon()) return;
+               var member = relation.memberById(entity.id);
 
-               layer = layer.enter()
-                   .append('g')
-                   .attr('class', 'layer-mapillary-map-features layer-mapillary-detections')
-                   .style('display', enabled ? 'block' : 'none')
-                   .merge(layer);
+               if (member && isMissingRole(member)) {
+                 issues.push(makeIssue(entity, relation, member));
+               }
+             });
+           } else if (entity.type === 'relation' && entity.isMultipolygon()) {
+             entity.indexedMembers().forEach(function (member) {
+               var way = graph.hasEntity(member.id);
 
-               if (enabled) {
-                   if (service && ~~context.map().zoom() >= minZoom) {
-                       editOn();
-                       update();
-                       service.loadMapFeatures(projection);
-                   } else {
-                       editOff();
-                   }
+               if (way && isMissingRole(member)) {
+                 issues.push(makeIssue(way, entity, member));
                }
+             });
            }
 
+           return issues;
+         };
 
-           drawMapFeatures.enabled = function(_) {
-               if (!arguments.length) return svgMapillaryMapFeatures.enabled;
-               svgMapillaryMapFeatures.enabled = _;
-               if (svgMapillaryMapFeatures.enabled) {
-                   showLayer();
-               } else {
-                   hideLayer();
-               }
-               dispatch.call('change');
-               return this;
-           };
+         function isMissingRole(member) {
+           return !member.role || !member.role.trim().length;
+         }
 
+         function makeIssue(way, relation, member) {
+           return new validationIssue({
+             type: type,
+             severity: 'warning',
+             message: function message(context) {
+               var member = context.hasEntity(this.entityIds[1]),
+                   relation = context.hasEntity(this.entityIds[0]);
+               return member && relation ? _t.html('issues.missing_role.message', {
+                 member: utilDisplayLabel(member, context.graph()),
+                 relation: utilDisplayLabel(relation, context.graph())
+               }) : '';
+             },
+             reference: showReference,
+             entityIds: [relation.id, way.id],
+             data: {
+               member: member
+             },
+             hash: member.index.toString(),
+             dynamicFixes: function dynamicFixes() {
+               return [makeAddRoleFix('inner'), makeAddRoleFix('outer'), new validationIssueFix({
+                 icon: 'iD-operation-delete',
+                 title: _t.html('issues.fix.remove_from_relation.title'),
+                 onClick: function onClick(context) {
+                   context.perform(actionDeleteMember(this.issue.entityIds[0], this.issue.data.member.index), _t('operations.delete_member.annotation', {
+                     n: 1
+                   }));
+                 }
+               })];
+             }
+           });
 
-           drawMapFeatures.supported = function() {
-               return !!getService();
-           };
+           function showReference(selection) {
+             selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.missing_role.multipolygon.reference'));
+           }
+         }
 
+         function makeAddRoleFix(role) {
+           return new validationIssueFix({
+             title: _t.html('issues.fix.set_as_' + role + '.title'),
+             onClick: function onClick(context) {
+               var oldMember = this.issue.data.member;
+               var member = {
+                 id: this.issue.entityIds[1],
+                 type: oldMember.type,
+                 role: role
+               };
+               context.perform(actionChangeMember(this.issue.entityIds[0], member, oldMember.index), _t('operations.change_role.annotation', {
+                 n: 1
+               }));
+             }
+           });
+         }
 
-           init();
-           return drawMapFeatures;
+         validation.type = type;
+         return validation;
        }
 
-       function svgOpenstreetcamImages(projection, context, dispatch) {
-           var throttledRedraw = throttle(function () { dispatch.call('change'); }, 1000);
-           var minZoom = 12;
-           var minMarkerZoom = 16;
-           var minViewfieldZoom = 18;
-           var layer = select(null);
-           var _openstreetcam;
+       function validationMissingTag(context) {
+         var type = 'missing_tag';
 
+         function hasDescriptiveTags(entity, graph) {
+           var keys = Object.keys(entity.tags).filter(function (k) {
+             if (k === 'area' || k === 'name') {
+               return false;
+             } else {
+               return osmIsInterestingTag(k);
+             }
+           });
+
+           if (entity.type === 'relation' && keys.length === 1 && entity.tags.type === 'multipolygon') {
+             // this relation's only interesting tag just says its a multipolygon,
+             // which is not descriptive enough
+             // It's okay for a simple multipolygon to have no descriptive tags
+             // if its outer way has them (old model, see `outdated_tags.js`)
+             return osmOldMultipolygonOuterMemberOfRelation(entity, graph);
+           }
+
+           return keys.length > 0;
+         }
+
+         function isUnknownRoad(entity) {
+           return entity.type === 'way' && entity.tags.highway === 'road';
+         }
+
+         function isUntypedRelation(entity) {
+           return entity.type === 'relation' && !entity.tags.type;
+         }
+
+         var validation = function checkMissingTag(entity, graph) {
+           var subtype;
+           var osm = context.connection();
+           var isUnloadedNode = entity.type === 'node' && osm && !osm.isDataLoaded(entity.loc); // we can't know if the node is a vertex if the tile is undownloaded
+
+           if (!isUnloadedNode && // allow untagged nodes that are part of ways
+           entity.geometry(graph) !== 'vertex' && // allow untagged entities that are part of relations
+           !entity.hasParentRelations(graph)) {
+             if (Object.keys(entity.tags).length === 0) {
+               subtype = 'any';
+             } else if (!hasDescriptiveTags(entity, graph)) {
+               subtype = 'descriptive';
+             } else if (isUntypedRelation(entity)) {
+               subtype = 'relation_type';
+             }
+           } // flag an unknown road even if it's a member of a relation
 
-           function init() {
-               if (svgOpenstreetcamImages.initialized) return;  // run once
-               svgOpenstreetcamImages.enabled = false;
-               svgOpenstreetcamImages.initialized = true;
+
+           if (!subtype && isUnknownRoad(entity)) {
+             subtype = 'highway_classification';
            }
 
+           if (!subtype) return [];
+           var messageID = subtype === 'highway_classification' ? 'unknown_road' : 'missing_tag.' + subtype;
+           var referenceID = subtype === 'highway_classification' ? 'unknown_road' : 'missing_tag'; // can always delete if the user created it in the first place..
+
+           var canDelete = entity.version === undefined || entity.v !== undefined;
+           var severity = canDelete && subtype !== 'highway_classification' ? 'error' : 'warning';
+           return [new validationIssue({
+             type: type,
+             subtype: subtype,
+             severity: severity,
+             message: function message(context) {
+               var entity = context.hasEntity(this.entityIds[0]);
+               return entity ? _t.html('issues.' + messageID + '.message', {
+                 feature: utilDisplayLabel(entity, context.graph())
+               }) : '';
+             },
+             reference: showReference,
+             entityIds: [entity.id],
+             dynamicFixes: function dynamicFixes(context) {
+               var fixes = [];
+               var selectFixType = subtype === 'highway_classification' ? 'select_road_type' : 'select_preset';
+               fixes.push(new validationIssueFix({
+                 icon: 'iD-icon-search',
+                 title: _t.html('issues.fix.' + selectFixType + '.title'),
+                 onClick: function onClick(context) {
+                   context.ui().sidebar.showPresetList();
+                 }
+               }));
+               var deleteOnClick;
+               var id = this.entityIds[0];
+               var operation = operationDelete(context, [id]);
+               var disabledReasonID = operation.disabled();
+
+               if (!disabledReasonID) {
+                 deleteOnClick = function deleteOnClick(context) {
+                   var id = this.issue.entityIds[0];
+                   var operation = operationDelete(context, [id]);
 
-           function getService() {
-               if (services.openstreetcam && !_openstreetcam) {
-                   _openstreetcam = services.openstreetcam;
-                   _openstreetcam.event.on('loadedImages', throttledRedraw);
-               } else if (!services.openstreetcam && _openstreetcam) {
-                   _openstreetcam = null;
+                   if (!operation.disabled()) {
+                     operation();
+                   }
+                 };
                }
 
-               return _openstreetcam;
+               fixes.push(new validationIssueFix({
+                 icon: 'iD-operation-delete',
+                 title: _t.html('issues.fix.delete_feature.title'),
+                 disabledReason: disabledReasonID ? _t('operations.delete.' + disabledReasonID + '.single') : undefined,
+                 onClick: deleteOnClick
+               }));
+               return fixes;
+             }
+           })];
+
+           function showReference(selection) {
+             selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.' + referenceID + '.reference'));
            }
+         };
+
+         validation.type = type;
+         return validation;
+       }
+
+       var simplify = function simplify(str) {
+         return diacritics.remove(str.replace(/&/g, 'and').replace(/[\s\-=_!"#%'*{},.\/:;?\(\)\[\]@\\$\^*+<>~`’\u00a1\u00a7\u00b6\u00b7\u00bf\u037e\u0387\u055a-\u055f\u0589\u05c0\u05c3\u05c6\u05f3\u05f4\u0609\u060a\u060c\u060d\u061b\u061e\u061f\u066a-\u066d\u06d4\u0700-\u070d\u07f7-\u07f9\u0830-\u083e\u085e\u0964\u0965\u0970\u0af0\u0df4\u0e4f\u0e5a\u0e5b\u0f04-\u0f12\u0f14\u0f85\u0fd0-\u0fd4\u0fd9\u0fda\u104a-\u104f\u10fb\u1360-\u1368\u166d\u166e\u16eb-\u16ed\u1735\u1736\u17d4-\u17d6\u17d8-\u17da\u1800-\u1805\u1807-\u180a\u1944\u1945\u1a1e\u1a1f\u1aa0-\u1aa6\u1aa8-\u1aad\u1b5a-\u1b60\u1bfc-\u1bff\u1c3b-\u1c3f\u1c7e\u1c7f\u1cc0-\u1cc7\u1cd3\u2016\u2017\u2020-\u2027\u2030-\u2038\u203b-\u203e\u2041-\u2043\u2047-\u2051\u2053\u2055-\u205e\u2cf9-\u2cfc\u2cfe\u2cff\u2d70\u2e00\u2e01\u2e06-\u2e08\u2e0b\u2e0e-\u2e16\u2e18\u2e19\u2e1b\u2e1e\u2e1f\u2e2a-\u2e2e\u2e30-\u2e39\u3001-\u3003\u303d\u30fb\ua4fe\ua4ff\ua60d-\ua60f\ua673\ua67e\ua6f2-\ua6f7\ua874-\ua877\ua8ce\ua8cf\ua8f8-\ua8fa\ua92e\ua92f\ua95f\ua9c1-\ua9cd\ua9de\ua9df\uaa5c-\uaa5f\uaade\uaadf\uaaf0\uaaf1\uabeb\ufe10-\ufe16\ufe19\ufe30\ufe45\ufe46\ufe49-\ufe4c\ufe50-\ufe52\ufe54-\ufe57\ufe5f-\ufe61\ufe68\ufe6a\ufe6b\uff01-\uff03\uff05-\uff07\uff0a\uff0c\uff0e\uff0f\uff1a\uff1b\uff1f\uff20\uff3c\uff61\uff64\uff65]+/g, '').toLowerCase());
+       };
 
+       // {
+       //   kvnd:        "amenity/fast_food|Thaï Express~(North America)",
+       //   kvn:         "amenity/fast_food|Thaï Express",
+       //   kv:          "amenity/fast_food",
+       //   k:           "amenity",
+       //   v:           "fast_food",
+       //   n:           "Thaï Express",
+       //   d:           "(North America)",
+       //   nsimple:     "thaiexpress",
+       //   kvnnsimple:  "amenity/fast_food|thaiexpress"
+       // }
 
-           function showLayer() {
-               var service = getService();
-               if (!service) return;
+       var to_parts = function to_parts(kvnd) {
+         var parts = {};
+         parts.kvnd = kvnd;
+         var kvndparts = kvnd.split('~', 2);
+         if (kvndparts.length > 1) parts.d = kvndparts[1];
+         parts.kvn = kvndparts[0];
+         var kvnparts = parts.kvn.split('|', 2);
+         if (kvnparts.length > 1) parts.n = kvnparts[1];
+         parts.kv = kvnparts[0];
+         var kvparts = parts.kv.split('/', 2);
+         parts.k = kvparts[0];
+         parts.v = kvparts[1];
+         parts.nsimple = simplify(parts.n);
+         parts.kvnsimple = parts.kv + '|' + parts.nsimple;
+         return parts;
+       };
 
-               editOn();
+       var matchGroups = {adult_gaming_centre:["amenity/casino","amenity/gambling","leisure/adult_gaming_centre"],beauty:["shop/beauty","shop/hairdresser_supply"],bed:["shop/bed","shop/furniture"],beverages:["shop/alcohol","shop/beverages"],camping:["leisure/park","tourism/camp_site","tourism/caravan_site"],car_parts:["shop/car_parts","shop/car_repair","shop/tires","shop/tyres"],confectionery:["shop/candy","shop/chocolate","shop/confectionery"],convenience:["shop/beauty","shop/chemist","shop/convenience","shop/cosmetics","shop/newsagent"],coworking:["amenity/coworking_space","office/coworking","office/coworking_space"],electronics:["office/telecommunication","shop/computer","shop/electronics","shop/hifi","shop/mobile","shop/mobile_phone","shop/telecommunication"],fashion:["shop/accessories","shop/bag","shop/botique","shop/clothes","shop/department_store","shop/fashion","shop/fashion_accessories","shop/sports","shop/shoes"],financial:["amenity/bank","office/accountant","office/financial","office/financial_advisor","office/tax_advisor","shop/tax"],fitness:["leisure/fitness_centre","leisure/fitness_center","leisure/sports_centre","leisure/sports_center"],food:["amenity/cafe","amenity/fast_food","amenity/ice_cream","amenity/restaurant","shop/bakery","shop/ice_cream","shop/pastry","shop/tea","shop/coffee"],fuel:["amenity/fuel","shop/gas","shop/convenience;gas","shop/gas;convenience"],gift:["shop/gift","shop/card","shop/cards","shop/stationery"],hardware:["shop/carpet","shop/diy","shop/doityourself","shop/doors","shop/electrical","shop/flooring","shop/hardware","shop/power_tools","shop/tool_hire","shop/tools","shop/trade"],health_food:["shop/health","shop/health_food","shop/herbalist","shop/nutrition_supplements"],houseware:["shop/houseware","shop/interior_decoration"],lodging:["tourism/hotel","tourism/motel"],money_transfer:["amenity/money_transfer","shop/money_transfer"],outdoor:["shop/outdoor","shop/sports"],rental:["amenity/bicycle_rental","amenity/boat_rental","amenity/car_rental","amenity/truck_rental","amenity/vehicle_rental","shop/rental"],school:["amenity/childcare","amenity/college","amenity/kindergarten","amenity/language_school","amenity/prep_school","amenity/school","amenity/university"],supermarket:["shop/food","shop/frozen_food","shop/greengrocer","shop/grocery","shop/supermarket","shop/wholesale"],variety_store:["shop/variety_store","shop/supermarket","shop/discount","shop/convenience"],vending:["amenity/vending_machine","shop/vending_machine"],wholesale:["shop/wholesale","shop/supermarket","shop/department_store"]};
+       var require$$0 = {
+       matchGroups: matchGroups
+       };
 
-               layer
-                   .style('opacity', 0)
-                   .transition()
-                   .duration(250)
-                   .style('opacity', 1)
-                   .on('end', function () { dispatch.call('change'); });
-           }
+       var matchGroups$1 = require$$0.matchGroups;
 
+       var matcher$1 = function matcher() {
+         var _warnings = []; // array of match conflict pairs
 
-           function hideLayer() {
-               throttledRedraw.cancel();
+         var _ambiguous = {};
+         var _matchIndex = {};
+         var matcher = {}; // Create an index of all the keys/simplenames for fast matching
 
-               layer
-                   .transition()
-                   .duration(250)
-                   .style('opacity', 0)
-                   .on('end', editOff);
-           }
+         matcher.buildMatchIndex = function (brands) {
+           // two passes - once for primary names, once for secondary/alternate names
+           Object.keys(brands).forEach(function (kvnd) {
+             return insertNames(kvnd, 'primary');
+           });
+           Object.keys(brands).forEach(function (kvnd) {
+             return insertNames(kvnd, 'secondary');
+           });
 
+           function insertNames(kvnd, which) {
+             var obj = brands[kvnd];
+             var parts = to_parts(kvnd); // Exit early for ambiguous names in the second pass.
+             // They were collected in the first pass and we don't gather alt names for them.
 
-           function editOn() {
-               layer.style('display', 'block');
-           }
+             if (which === 'secondary' && parts.d) return;
 
+             if (obj.countryCodes) {
+               parts.countryCodes = obj.countryCodes.slice(); // copy
+             }
 
-           function editOff() {
-               layer.selectAll('.viewfield-group').remove();
-               layer.style('display', 'none');
-           }
+             var nomatches = obj.nomatch || [];
 
+             if (nomatches.some(function (s) {
+               return s === kvnd;
+             })) {
+               console.log("WARNING match/nomatch conflict for ".concat(kvnd));
+               return;
+             }
 
-           function click(d) {
-               var service = getService();
-               if (!service) return;
+             var match_kv = [parts.kv].concat(obj.matchTags || []).concat(["".concat(parts.k, "/yes"), "building/yes"]) // #3454 - match some generic tags
+             .map(function (s) {
+               return s.toLowerCase();
+             });
+             var match_nsimple = [];
 
-               service
-                   .selectImage(context, d)
-                   .updateViewer(context, d)
-                   .showViewer(context);
+             if (which === 'primary') {
+               match_nsimple = [parts.n].concat(obj.matchNames || []).concat(obj.tags.official_name || []) // #2732 - match alternate names
+               .map(simplify);
+             } else if (which === 'secondary') {
+               match_nsimple = [].concat(obj.tags.alt_name || []) // #2732 - match alternate names
+               .concat(obj.tags.short_name || []) // #2732 - match alternate names
+               .map(simplify);
+             }
 
-               context.map().centerEase(d.loc);
-           }
+             if (!match_nsimple.length) return; // nothing to do
 
+             match_kv.forEach(function (kv) {
+               match_nsimple.forEach(function (nsimple) {
+                 if (parts.d) {
+                   // Known ambiguous names with disambiguation string ~(USA) / ~(Canada)
+                   // FIXME: Name collisions will overwrite the initial entry (ok for now)
+                   if (!_ambiguous[kv]) _ambiguous[kv] = {};
+                   _ambiguous[kv][nsimple] = parts;
+                 } else {
+                   // Names we mostly expect to be unique..
+                   if (!_matchIndex[kv]) _matchIndex[kv] = {};
+                   var m = _matchIndex[kv][nsimple];
 
-           function mouseover(d) {
-               var service = getService();
-               if (service) service.setStyles(context, d);
+                   if (m) {
+                     // There already is a match for this name, skip it
+                     // Warn if we detect collisions in a primary name.
+                     // Skip warning if a secondary name or a generic `*=yes` tag - #2972 / #3454
+                     if (which === 'primary' && !/\/yes$/.test(kv)) {
+                       _warnings.push([m.kvnd, "".concat(kvnd, " (").concat(kv, "/").concat(nsimple, ")")]);
+                     }
+                   } else {
+                     _matchIndex[kv][nsimple] = parts; // insert
+                   }
+                 }
+               });
+             });
            }
+         }; // pass a `key`, `value`, `name` and return the best match,
+         // `countryCode` optional (if supplied, must match that too)
 
 
-           function mouseout() {
-               var service = getService();
-               if (service) service.setStyles(context, null);
-           }
-
+         matcher.matchKVN = function (key, value, name, countryCode) {
+           return matcher.matchParts(to_parts("".concat(key, "/").concat(value, "|").concat(name)), countryCode);
+         }; // pass a parts object and return the best match,
+         // `countryCode` optional (if supplied, must match that too)
 
-           function transform(d) {
-               var t = svgPointTransform(projection)(d);
-               if (d.ca) {
-                   t += ' rotate(' + Math.floor(d.ca) + ',0,0)';
-               }
-               return t;
-           }
 
+         matcher.matchParts = function (parts, countryCode) {
+           var match = null;
+           var inGroup = false; // fixme: we currently return a single match for ambiguous
 
-           context.photos().on('change.openstreetcam_images', update);
+           match = _ambiguous[parts.kv] && _ambiguous[parts.kv][parts.nsimple];
+           if (match && matchesCountryCode(match)) return match; // try to return an exact match
 
-           function update() {
-               var viewer = context.container().select('.photoviewer');
-               var selected = viewer.empty() ? undefined : viewer.datum();
+           match = _matchIndex[parts.kv] && _matchIndex[parts.kv][parts.nsimple];
+           if (match && matchesCountryCode(match)) return match; // look in match groups
 
-               var z = ~~context.map().zoom();
-               var showMarkers = (z >= minMarkerZoom);
-               var showViewfields = (z >= minViewfieldZoom);
+           for (var mg in matchGroups$1) {
+             var matchGroup = matchGroups$1[mg];
+             match = null;
+             inGroup = false;
 
-               var service = getService();
-               var sequences = [];
-               var images = [];
+             for (var i = 0; i < matchGroup.length; i++) {
+               var otherkv = matchGroup[i].toLowerCase();
 
-               if (context.photos().showsFlat()) {
-                   sequences = (service ? service.sequences(projection) : []);
-                   images = (service && showMarkers ? service.images(projection) : []);
+               if (!inGroup) {
+                 inGroup = otherkv === parts.kv;
                }
 
-               var traces = layer.selectAll('.sequences').selectAll('.sequence')
-                   .data(sequences, function(d) { return d.properties.key; });
-
-               // exit
-               traces.exit()
-                   .remove();
+               if (!match) {
+                 // fixme: we currently return a single match for ambiguous
+                 match = _ambiguous[otherkv] && _ambiguous[otherkv][parts.nsimple];
+               }
 
-               // enter/update
-               traces = traces.enter()
-                   .append('path')
-                   .attr('class', 'sequence')
-                   .merge(traces)
-                   .attr('d', svgPath(projection).geojson);
+               if (!match) {
+                 match = _matchIndex[otherkv] && _matchIndex[otherkv][parts.nsimple];
+               }
 
+               if (match && !matchesCountryCode(match)) {
+                 match = null;
+               }
 
-               var groups = layer.selectAll('.markers').selectAll('.viewfield-group')
-                   .data(images, function(d) { return d.key; });
+               if (inGroup && match) {
+                 return match;
+               }
+             }
+           }
 
-               // exit
-               groups.exit()
-                   .remove();
+           return null;
 
-               // enter
-               var groupsEnter = groups.enter()
-                   .append('g')
-                   .attr('class', 'viewfield-group')
-                   .on('mouseenter', mouseover)
-                   .on('mouseleave', mouseout)
-                   .on('click', click);
+           function matchesCountryCode(match) {
+             if (!countryCode) return true;
+             if (!match.countryCodes) return true;
+             return match.countryCodes.indexOf(countryCode) !== -1;
+           }
+         };
 
-               groupsEnter
-                   .append('g')
-                   .attr('class', 'viewfield-scale');
+         matcher.getWarnings = function () {
+           return _warnings;
+         };
 
-               // update
-               var markers = groups
-                   .merge(groupsEnter)
-                   .sort(function(a, b) {
-                       return (a === selected) ? 1
-                           : (b === selected) ? -1
-                           : b.loc[1] - a.loc[1];  // sort Y
-                   })
-                   .attr('transform', transform)
-                   .select('.viewfield-scale');
+         return matcher;
+       };
 
+       var fromCharCode = String.fromCharCode;
+       var nativeFromCodePoint = String.fromCodePoint;
 
-               markers.selectAll('circle')
-                   .data([0])
-                   .enter()
-                   .append('circle')
-                   .attr('dx', '0')
-                   .attr('dy', '0')
-                   .attr('r', '6');
+       // length should be 1, old FF problem
+       var INCORRECT_LENGTH = !!nativeFromCodePoint && nativeFromCodePoint.length != 1;
 
-               var viewfields = markers.selectAll('.viewfield')
-                   .data(showViewfields ? [0] : []);
+       // `String.fromCodePoint` method
+       // https://tc39.github.io/ecma262/#sec-string.fromcodepoint
+       _export({ target: 'String', stat: true, forced: INCORRECT_LENGTH }, {
+         fromCodePoint: function fromCodePoint(x) { // eslint-disable-line no-unused-vars
+           var elements = [];
+           var length = arguments.length;
+           var i = 0;
+           var code;
+           while (length > i) {
+             code = +arguments[i++];
+             if (toAbsoluteIndex(code, 0x10FFFF) !== code) throw RangeError(code + ' is not a valid code point');
+             elements.push(code < 0x10000
+               ? fromCharCode(code)
+               : fromCharCode(((code -= 0x10000) >> 10) + 0xD800, code % 0x400 + 0xDC00)
+             );
+           } return elements.join('');
+         }
+       });
 
-               viewfields.exit()
-                   .remove();
+       var quickselect$2 = createCommonjsModule(function (module, exports) {
+         (function (global, factory) {
+            module.exports = factory() ;
+         })(commonjsGlobal, function () {
 
-               viewfields.enter()               // viewfields may or may not be drawn...
-                   .insert('path', 'circle')    // but if they are, draw below the circles
-                   .attr('class', 'viewfield')
-                   .attr('transform', 'scale(1.5,1.5),translate(-8, -13)')
-                   .attr('d', 'M 6,9 C 8,8.4 8,8.4 10,9 L 16,-2 C 12,-5 4,-5 0,-2 z');
+           function quickselect(arr, k, left, right, compare) {
+             quickselectStep(arr, k, left || 0, right || arr.length - 1, compare || defaultCompare);
            }
 
+           function quickselectStep(arr, k, left, right, compare) {
+             while (right > left) {
+               if (right - left > 600) {
+                 var n = right - left + 1;
+                 var m = k - left + 1;
+                 var z = Math.log(n);
+                 var s = 0.5 * Math.exp(2 * z / 3);
+                 var sd = 0.5 * Math.sqrt(z * s * (n - s) / n) * (m - n / 2 < 0 ? -1 : 1);
+                 var newLeft = Math.max(left, Math.floor(k - m * s / n + sd));
+                 var newRight = Math.min(right, Math.floor(k + (n - m) * s / n + sd));
+                 quickselectStep(arr, k, newLeft, newRight, compare);
+               }
 
-           function drawImages(selection) {
-               var enabled = svgOpenstreetcamImages.enabled,
-                   service = getService();
-
-               layer = selection.selectAll('.layer-openstreetcam')
-                   .data(service ? [0] : []);
-
-               layer.exit()
-                   .remove();
-
-               var layerEnter = layer.enter()
-                   .append('g')
-                   .attr('class', 'layer-openstreetcam')
-                   .style('display', enabled ? 'block' : 'none');
-
-               layerEnter
-                   .append('g')
-                   .attr('class', 'sequences');
+               var t = arr[k];
+               var i = left;
+               var j = right;
+               swap(arr, left, k);
+               if (compare(arr[right], t) > 0) swap(arr, left, right);
 
-               layerEnter
-                   .append('g')
-                   .attr('class', 'markers');
+               while (i < j) {
+                 swap(arr, i, j);
+                 i++;
+                 j--;
 
-               layer = layerEnter
-                   .merge(layer);
+                 while (compare(arr[i], t) < 0) {
+                   i++;
+                 }
 
-               if (enabled) {
-                   if (service && ~~context.map().zoom() >= minZoom) {
-                       editOn();
-                       update();
-                       service.loadImages(projection);
-                   } else {
-                       editOff();
-                   }
+                 while (compare(arr[j], t) > 0) {
+                   j--;
+                 }
                }
-           }
 
-
-           drawImages.enabled = function(_) {
-               if (!arguments.length) return svgOpenstreetcamImages.enabled;
-               svgOpenstreetcamImages.enabled = _;
-               if (svgOpenstreetcamImages.enabled) {
-                   showLayer();
-               } else {
-                   hideLayer();
+               if (compare(arr[left], t) === 0) swap(arr, left, j);else {
+                 j++;
+                 swap(arr, j, right);
                }
-               dispatch.call('change');
-               return this;
-           };
+               if (j <= k) left = j + 1;
+               if (k <= j) right = j - 1;
+             }
+           }
 
+           function swap(arr, i, j) {
+             var tmp = arr[i];
+             arr[i] = arr[j];
+             arr[j] = tmp;
+           }
 
-           drawImages.supported = function() {
-               return !!getService();
-           };
+           function defaultCompare(a, b) {
+             return a < b ? -1 : a > b ? 1 : 0;
+           }
 
+           return quickselect;
+         });
+       });
 
-           init();
-           return drawImages;
-       }
+       var rbush_1 = rbush;
+       var _default$2 = rbush;
 
-       function svgOsm(projection, context, dispatch) {
-           var enabled = true;
+       function rbush(maxEntries, format) {
+         if (!(this instanceof rbush)) return new rbush(maxEntries, format); // max entries in a node is 9 by default; min node fill is 40% for best performance
 
+         this._maxEntries = Math.max(4, maxEntries || 9);
+         this._minEntries = Math.max(2, Math.ceil(this._maxEntries * 0.4));
 
-           function drawOsm(selection) {
-               selection.selectAll('.layer-osm')
-                   .data(['covered', 'areas', 'lines', 'points', 'labels'])
-                   .enter()
-                   .append('g')
-                   .attr('class', function(d) { return 'layer-osm ' + d; });
+         if (format) {
+           this._initFormat(format);
+         }
 
-               selection.selectAll('.layer-osm.points').selectAll('.points-group')
-                   .data(['points', 'midpoints', 'vertices', 'turns'])
-                   .enter()
-                   .append('g')
-                   .attr('class', function(d) { return 'points-group ' + d; });
-           }
+         this.clear();
+       }
 
+       rbush.prototype = {
+         all: function all() {
+           return this._all(this.data, []);
+         },
+         search: function search(bbox) {
+           var node = this.data,
+               result = [],
+               toBBox = this.toBBox;
+           if (!intersects$1(bbox, node)) return result;
+           var nodesToSearch = [],
+               i,
+               len,
+               child,
+               childBBox;
+
+           while (node) {
+             for (i = 0, len = node.children.length; i < len; i++) {
+               child = node.children[i];
+               childBBox = node.leaf ? toBBox(child) : child;
 
-           function showLayer() {
-               var layer = context.surface().selectAll('.data-layer.osm');
-               layer.interrupt();
+               if (intersects$1(bbox, childBBox)) {
+                 if (node.leaf) result.push(child);else if (contains$1(bbox, childBBox)) this._all(child, result);else nodesToSearch.push(child);
+               }
+             }
 
-               layer
-                   .classed('disabled', false)
-                   .style('opacity', 0)
-                   .transition()
-                   .duration(250)
-                   .style('opacity', 1)
-                   .on('end interrupt', function () {
-                       dispatch.call('change');
-                   });
+             node = nodesToSearch.pop();
            }
 
+           return result;
+         },
+         collides: function collides(bbox) {
+           var node = this.data,
+               toBBox = this.toBBox;
+           if (!intersects$1(bbox, node)) return false;
+           var nodesToSearch = [],
+               i,
+               len,
+               child,
+               childBBox;
+
+           while (node) {
+             for (i = 0, len = node.children.length; i < len; i++) {
+               child = node.children[i];
+               childBBox = node.leaf ? toBBox(child) : child;
 
-           function hideLayer() {
-               var layer = context.surface().selectAll('.data-layer.osm');
-               layer.interrupt();
+               if (intersects$1(bbox, childBBox)) {
+                 if (node.leaf || contains$1(bbox, childBBox)) return true;
+                 nodesToSearch.push(child);
+               }
+             }
 
-               layer
-                   .transition()
-                   .duration(250)
-                   .style('opacity', 0)
-                   .on('end interrupt', function () {
-                       layer.classed('disabled', true);
-                       dispatch.call('change');
-                   });
+             node = nodesToSearch.pop();
            }
 
+           return false;
+         },
+         load: function load(data) {
+           if (!(data && data.length)) return this;
 
-           drawOsm.enabled = function(val) {
-               if (!arguments.length) return enabled;
-               enabled = val;
-
-               if (enabled) {
-                   showLayer();
-               } else {
-                   hideLayer();
-               }
-
-               dispatch.call('change');
-               return this;
-           };
-
+           if (data.length < this._minEntries) {
+             for (var i = 0, len = data.length; i < len; i++) {
+               this.insert(data[i]);
+             }
 
-           return drawOsm;
-       }
+             return this;
+           } // recursively build the tree with the given data from scratch using OMT algorithm
 
-       var _notesEnabled = false;
-       var _osmService;
 
+           var node = this._build(data.slice(), 0, data.length - 1, 0);
 
-       function svgNotes(projection, context, dispatch$1) {
-           if (!dispatch$1) { dispatch$1 = dispatch('change'); }
-           var throttledRedraw = throttle(function () { dispatch$1.call('change'); }, 1000);
-           var minZoom = 12;
-           var touchLayer = select(null);
-           var drawLayer = select(null);
-           var _notesVisible = false;
+           if (!this.data.children.length) {
+             // save as is if tree is empty
+             this.data = node;
+           } else if (this.data.height === node.height) {
+             // split root if trees have the same height
+             this._splitRoot(this.data, node);
+           } else {
+             if (this.data.height < node.height) {
+               // swap trees if inserted one is bigger
+               var tmpNode = this.data;
+               this.data = node;
+               node = tmpNode;
+             } // insert the small tree into the large tree at appropriate level
 
 
-           function markerPath(selection, klass) {
-               selection
-                   .attr('class', klass)
-                   .attr('transform', 'translate(-8, -22)')
-                   .attr('d', 'm17.5,0l-15,0c-1.37,0 -2.5,1.12 -2.5,2.5l0,11.25c0,1.37 1.12,2.5 2.5,2.5l3.75,0l0,3.28c0,0.38 0.43,0.6 0.75,0.37l4.87,-3.65l5.62,0c1.37,0 2.5,-1.12 2.5,-2.5l0,-11.25c0,-1.37 -1.12,-2.5 -2.5,-2.5z');
+             this._insert(node, this.data.height - node.height - 1, true);
            }
 
+           return this;
+         },
+         insert: function insert(item) {
+           if (item) this._insert(item, this.data.height - 1);
+           return this;
+         },
+         clear: function clear() {
+           this.data = createNode$1([]);
+           return this;
+         },
+         remove: function remove(item, equalsFn) {
+           if (!item) return this;
+           var node = this.data,
+               bbox = this.toBBox(item),
+               path = [],
+               indexes = [],
+               i,
+               parent,
+               index,
+               goingUp; // depth-first iterative tree traversal
+
+           while (node || path.length) {
+             if (!node) {
+               // go up
+               node = path.pop();
+               parent = path[path.length - 1];
+               i = indexes.pop();
+               goingUp = true;
+             }
+
+             if (node.leaf) {
+               // check current node
+               index = findItem$1(item, node.children, equalsFn);
 
-           // Loosely-coupled osm service for fetching notes.
-           function getService() {
-               if (services.osm && !_osmService) {
-                   _osmService = services.osm;
-                   _osmService.on('loadedNotes', throttledRedraw);
-               } else if (!services.osm && _osmService) {
-                   _osmService = null;
-               }
-
-               return _osmService;
-           }
+               if (index !== -1) {
+                 // item found, remove the item and condense tree upwards
+                 node.children.splice(index, 1);
+                 path.push(node);
 
+                 this._condense(path);
 
-           // Show the notes
-           function editOn() {
-               if (!_notesVisible) {
-                   _notesVisible = true;
-                   drawLayer
-                       .style('display', 'block');
+                 return this;
                }
-           }
+             }
 
+             if (!goingUp && !node.leaf && contains$1(node, bbox)) {
+               // go down
+               path.push(node);
+               indexes.push(i);
+               i = 0;
+               parent = node;
+               node = node.children[0];
+             } else if (parent) {
+               // go right
+               i++;
+               node = parent.children[i];
+               goingUp = false;
+             } else node = null; // nothing found
 
-           // Immediately remove the notes and their touch targets
-           function editOff() {
-               if (_notesVisible) {
-                   _notesVisible = false;
-                   drawLayer
-                       .style('display', 'none');
-                   drawLayer.selectAll('.note')
-                       .remove();
-                   touchLayer.selectAll('.note')
-                       .remove();
-               }
            }
 
+           return this;
+         },
+         toBBox: function toBBox(item) {
+           return item;
+         },
+         compareMinX: compareNodeMinX$1,
+         compareMinY: compareNodeMinY$1,
+         toJSON: function toJSON() {
+           return this.data;
+         },
+         fromJSON: function fromJSON(data) {
+           this.data = data;
+           return this;
+         },
+         _all: function _all(node, result) {
+           var nodesToSearch = [];
 
-           // Enable the layer.  This shows the notes and transitions them to visible.
-           function layerOn() {
-               editOn();
-
-               drawLayer
-                   .style('opacity', 0)
-                   .transition()
-                   .duration(250)
-                   .style('opacity', 1)
-                   .on('end interrupt', function () {
-                       dispatch$1.call('change');
-                   });
+           while (node) {
+             if (node.leaf) result.push.apply(result, node.children);else nodesToSearch.push.apply(nodesToSearch, node.children);
+             node = nodesToSearch.pop();
            }
 
+           return result;
+         },
+         _build: function _build(items, left, right, height) {
+           var N = right - left + 1,
+               M = this._maxEntries,
+               node;
 
-           // Disable the layer.  This transitions the layer invisible and then hides the notes.
-           function layerOff() {
-               throttledRedraw.cancel();
-               drawLayer.interrupt();
-               touchLayer.selectAll('.note')
-                   .remove();
-
-               drawLayer
-                   .transition()
-                   .duration(250)
-                   .style('opacity', 0)
-                   .on('end interrupt', function () {
-                       editOff();
-                       dispatch$1.call('change');
-                   });
+           if (N <= M) {
+             // reached leaf level; return leaf
+             node = createNode$1(items.slice(left, right + 1));
+             calcBBox$1(node, this.toBBox);
+             return node;
            }
 
+           if (!height) {
+             // target height of the bulk-loaded tree
+             height = Math.ceil(Math.log(N) / Math.log(M)); // target number of root entries to maximize storage utilization
 
-           // Update the note markers
-           function updateMarkers() {
-               if (!_notesVisible || !_notesEnabled) return;
-
-               var service = getService();
-               var selectedID = context.selectedNoteID();
-               var data = (service ? service.notes(projection) : []);
-               var getTransform = svgPointTransform(projection);
-
-               // Draw markers..
-               var notes = drawLayer.selectAll('.note')
-                   .data(data, function(d) { return d.status + d.id; });
-
-               // exit
-               notes.exit()
-                   .remove();
-
-               // enter
-               var notesEnter = notes.enter()
-                   .append('g')
-                   .attr('class', function(d) { return 'note note-' + d.id + ' ' + d.status; })
-                   .classed('new', function(d) { return d.id < 0; });
-
-               notesEnter
-                   .append('ellipse')
-                   .attr('cx', 0.5)
-                   .attr('cy', 1)
-                   .attr('rx', 6.5)
-                   .attr('ry', 3)
-                   .attr('class', 'stroke');
-
-               notesEnter
-                   .append('path')
-                   .call(markerPath, 'shadow');
-
-               notesEnter
-                   .append('use')
-                   .attr('class', 'note-fill')
-                   .attr('width', '20px')
-                   .attr('height', '20px')
-                   .attr('x', '-8px')
-                   .attr('y', '-22px')
-                   .attr('xlink:href', '#iD-icon-note');
-
-               notesEnter.selectAll('.icon-annotation')
-                   .data(function(d) { return [d]; })
-                   .enter()
-                   .append('use')
-                   .attr('class', 'icon-annotation')
-                   .attr('width', '10px')
-                   .attr('height', '10px')
-                   .attr('x', '-3px')
-                   .attr('y', '-19px')
-                   .attr('xlink:href', function(d) {
-                       return '#iD-icon-' + (d.id < 0 ? 'plus' : (d.status === 'open' ? 'close' : 'apply'));
-                   });
-
-               // update
-               notes
-                   .merge(notesEnter)
-                   .sort(sortY)
-                   .classed('selected', function(d) {
-                       var mode = context.mode();
-                       var isMoving = mode && mode.id === 'drag-note';  // no shadows when dragging
-                       return !isMoving && d.id === selectedID;
-                   })
-                   .attr('transform', getTransform);
-
-
-               // Draw targets..
-               if (touchLayer.empty()) return;
-               var fillClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
+             M = Math.ceil(N / Math.pow(M, height - 1));
+           }
 
-               var targets = touchLayer.selectAll('.note')
-                   .data(data, function(d) { return d.id; });
+           node = createNode$1([]);
+           node.leaf = false;
+           node.height = height; // split the items into M mostly square tiles
 
-               // exit
-               targets.exit()
-                   .remove();
+           var N2 = Math.ceil(N / M),
+               N1 = N2 * Math.ceil(Math.sqrt(M)),
+               i,
+               j,
+               right2,
+               right3;
+           multiSelect$1(items, left, right, N1, this.compareMinX);
 
-               // enter/update
-               targets.enter()
-                   .append('rect')
-                   .attr('width', '20px')
-                   .attr('height', '20px')
-                   .attr('x', '-8px')
-                   .attr('y', '-22px')
-                   .merge(targets)
-                   .sort(sortY)
-                   .attr('class', function(d) {
-                       var newClass = (d.id < 0 ? 'new' : '');
-                       return 'note target note-' + d.id + ' ' + fillClass + newClass;
-                   })
-                   .attr('transform', getTransform);
+           for (i = left; i <= right; i += N1) {
+             right2 = Math.min(i + N1 - 1, right);
+             multiSelect$1(items, i, right2, N2, this.compareMinY);
 
+             for (j = i; j <= right2; j += N2) {
+               right3 = Math.min(j + N2 - 1, right2); // pack each entry recursively
 
-               function sortY(a, b) {
-                   return (a.id === selectedID) ? 1 : (b.id === selectedID) ? -1 : b.loc[1] - a.loc[1];
-               }
+               node.children.push(this._build(items, j, right3, height - 1));
+             }
            }
 
+           calcBBox$1(node, this.toBBox);
+           return node;
+         },
+         _chooseSubtree: function _chooseSubtree(bbox, node, level, path) {
+           var i, len, child, targetNode, area, enlargement, minArea, minEnlargement;
 
-           // Draw the notes layer and schedule loading notes and updating markers.
-           function drawNotes(selection) {
-               var service = getService();
+           while (true) {
+             path.push(node);
+             if (node.leaf || path.length - 1 === level) break;
+             minArea = minEnlargement = Infinity;
 
-               var surface = context.surface();
-               if (surface && !surface.empty()) {
-                   touchLayer = surface.selectAll('.data-layer.touch .layer-touch.markers');
+             for (i = 0, len = node.children.length; i < len; i++) {
+               child = node.children[i];
+               area = bboxArea$1(child);
+               enlargement = enlargedArea$1(bbox, child) - area; // choose entry with the least area enlargement
+
+               if (enlargement < minEnlargement) {
+                 minEnlargement = enlargement;
+                 minArea = area < minArea ? area : minArea;
+                 targetNode = child;
+               } else if (enlargement === minEnlargement) {
+                 // otherwise choose one with the smallest area
+                 if (area < minArea) {
+                   minArea = area;
+                   targetNode = child;
+                 }
                }
+             }
 
-               drawLayer = selection.selectAll('.layer-notes')
-                   .data(service ? [0] : []);
-
-               drawLayer.exit()
-                   .remove();
-
-               drawLayer = drawLayer.enter()
-                   .append('g')
-                   .attr('class', 'layer-notes')
-                   .style('display', _notesEnabled ? 'block' : 'none')
-                   .merge(drawLayer);
-
-               if (_notesEnabled) {
-                   if (service && ~~context.map().zoom() >= minZoom) {
-                       editOn();
-                       service.loadNotes(projection);
-                       updateMarkers();
-                   } else {
-                       editOff();
-                   }
-               }
+             node = targetNode || node.children[0];
            }
 
+           return node;
+         },
+         _insert: function _insert(item, level, isNode) {
+           var toBBox = this.toBBox,
+               bbox = isNode ? item : toBBox(item),
+               insertPath = []; // find the best node for accommodating the item, saving all nodes along the path too
 
-           // Toggles the layer on and off
-           drawNotes.enabled = function(val) {
-               if (!arguments.length) return _notesEnabled;
+           var node = this._chooseSubtree(bbox, this.data, level, insertPath); // put the item into the node
 
-               _notesEnabled = val;
-               if (_notesEnabled) {
-                   layerOn();
-               } else {
-                   layerOff();
-                   if (context.selectedNoteID()) {
-                       context.enter(modeBrowse(context));
-                   }
-               }
 
-               dispatch$1.call('change');
-               return this;
-           };
+           node.children.push(item);
+           extend$3(node, bbox); // split on node overflow; propagate upwards if necessary
 
+           while (level >= 0) {
+             if (insertPath[level].children.length > this._maxEntries) {
+               this._split(insertPath, level);
 
-           return drawNotes;
-       }
+               level--;
+             } else break;
+           } // adjust bboxes along the insertion path
 
-       function svgTouch() {
 
-           function drawTouch(selection) {
-               selection.selectAll('.layer-touch')
-                   .data(['areas', 'lines', 'points', 'turns', 'markers'])
-                   .enter()
-                   .append('g')
-                   .attr('class', function(d) { return 'layer-touch ' + d; });
+           this._adjustParentBBoxes(bbox, insertPath, level);
+         },
+         // split overflowed node into two
+         _split: function _split(insertPath, level) {
+           var node = insertPath[level],
+               M = node.children.length,
+               m = this._minEntries;
+
+           this._chooseSplitAxis(node, m, M);
+
+           var splitIndex = this._chooseSplitIndex(node, m, M);
+
+           var newNode = createNode$1(node.children.splice(splitIndex, node.children.length - splitIndex));
+           newNode.height = node.height;
+           newNode.leaf = node.leaf;
+           calcBBox$1(node, this.toBBox);
+           calcBBox$1(newNode, this.toBBox);
+           if (level) insertPath[level - 1].children.push(newNode);else this._splitRoot(node, newNode);
+         },
+         _splitRoot: function _splitRoot(node, newNode) {
+           // split root node
+           this.data = createNode$1([node, newNode]);
+           this.data.height = node.height + 1;
+           this.data.leaf = false;
+           calcBBox$1(this.data, this.toBBox);
+         },
+         _chooseSplitIndex: function _chooseSplitIndex(node, m, M) {
+           var i, bbox1, bbox2, overlap, area, minOverlap, minArea, index;
+           minOverlap = minArea = Infinity;
+
+           for (i = m; i <= M - m; i++) {
+             bbox1 = distBBox$1(node, 0, i, this.toBBox);
+             bbox2 = distBBox$1(node, i, M, this.toBBox);
+             overlap = intersectionArea$1(bbox1, bbox2);
+             area = bboxArea$1(bbox1) + bboxArea$1(bbox2); // choose distribution with minimum overlap
+
+             if (overlap < minOverlap) {
+               minOverlap = overlap;
+               index = i;
+               minArea = area < minArea ? area : minArea;
+             } else if (overlap === minOverlap) {
+               // otherwise choose distribution with minimum area
+               if (area < minArea) {
+                 minArea = area;
+                 index = i;
+               }
+             }
            }
 
-           return drawTouch;
-       }
+           return index;
+         },
+         // sorts node children by the best axis for split
+         _chooseSplitAxis: function _chooseSplitAxis(node, m, M) {
+           var compareMinX = node.leaf ? this.compareMinX : compareNodeMinX$1,
+               compareMinY = node.leaf ? this.compareMinY : compareNodeMinY$1,
+               xMargin = this._allDistMargin(node, m, M, compareMinX),
+               yMargin = this._allDistMargin(node, m, M, compareMinY); // if total distributions margin value is minimal for x, sort by minX,
+           // otherwise it's already sorted by minY
 
-       function refresh(selection, node) {
-           var cr = node.getBoundingClientRect();
-           var prop = [cr.width, cr.height];
-           selection.property('__dimensions__', prop);
-           return prop;
-       }
 
-       function utilGetDimensions(selection, force) {
-           if (!selection || selection.empty()) {
-               return [0, 0];
+           if (xMargin < yMargin) node.children.sort(compareMinX);
+         },
+         // total margin of all possible split distributions where each node is at least m full
+         _allDistMargin: function _allDistMargin(node, m, M, compare) {
+           node.children.sort(compare);
+           var toBBox = this.toBBox,
+               leftBBox = distBBox$1(node, 0, m, toBBox),
+               rightBBox = distBBox$1(node, M - m, M, toBBox),
+               margin = bboxMargin$1(leftBBox) + bboxMargin$1(rightBBox),
+               i,
+               child;
+
+           for (i = m; i < M - m; i++) {
+             child = node.children[i];
+             extend$3(leftBBox, node.leaf ? toBBox(child) : child);
+             margin += bboxMargin$1(leftBBox);
            }
-           var node = selection.node(),
-               cached = selection.property('__dimensions__');
-           return (!cached || force) ? refresh(selection, node) : cached;
-       }
 
+           for (i = M - m - 1; i >= m; i--) {
+             child = node.children[i];
+             extend$3(rightBBox, node.leaf ? toBBox(child) : child);
+             margin += bboxMargin$1(rightBBox);
+           }
 
-       function utilSetDimensions(selection, dimensions) {
-           if (!selection || selection.empty()) {
-               return selection;
+           return margin;
+         },
+         _adjustParentBBoxes: function _adjustParentBBoxes(bbox, path, level) {
+           // adjust bboxes along the given tree path
+           for (var i = level; i >= 0; i--) {
+             extend$3(path[i], bbox);
            }
-           var node = selection.node();
-           if (dimensions === null) {
-               refresh(selection, node);
-               return selection;
+         },
+         _condense: function _condense(path) {
+           // go through the path, removing empty nodes and updating bboxes
+           for (var i = path.length - 1, siblings; i >= 0; i--) {
+             if (path[i].children.length === 0) {
+               if (i > 0) {
+                 siblings = path[i - 1].children;
+                 siblings.splice(siblings.indexOf(path[i]), 1);
+               } else this.clear();
+             } else calcBBox$1(path[i], this.toBBox);
            }
-           return selection
-               .property('__dimensions__', [dimensions[0], dimensions[1]])
-               .attr('width', dimensions[0])
-               .attr('height', dimensions[1]);
-       }
+         },
+         _initFormat: function _initFormat(format) {
+           // data format (minX, minY, maxX, maxY accessors)
+           // uses eval-type function compilation instead of just accepting a toBBox function
+           // because the algorithms are very sensitive to sorting functions performance,
+           // so they should be dead simple and without inner calls
+           var compareArr = ['return a', ' - b', ';'];
+           this.compareMinX = new Function('a', 'b', compareArr.join(format[0]));
+           this.compareMinY = new Function('a', 'b', compareArr.join(format[1]));
+           this.toBBox = new Function('a', 'return {minX: a' + format[0] + ', minY: a' + format[1] + ', maxX: a' + format[2] + ', maxY: a' + format[3] + '};');
+         }
+       };
 
-       function svgLayers(projection, context) {
-           var dispatch$1 = dispatch('change');
-           var svg = select(null);
-           var _layers = [
-               { id: 'osm', layer: svgOsm(projection, context, dispatch$1) },
-               { id: 'notes', layer: svgNotes(projection, context, dispatch$1) },
-               { id: 'data', layer: svgData(projection, context, dispatch$1) },
-               { id: 'keepRight', layer: svgKeepRight(projection, context, dispatch$1) },
-               { id: 'improveOSM', layer: svgImproveOSM(projection, context, dispatch$1) },
-               { id: 'osmose', layer: svgOsmose(projection, context, dispatch$1) },
-               { id: 'streetside', layer: svgStreetside(projection, context, dispatch$1)},
-               { id: 'mapillary', layer: svgMapillaryImages(projection, context, dispatch$1) },
-               { id: 'mapillary-map-features',  layer: svgMapillaryMapFeatures(projection, context, dispatch$1) },
-               { id: 'mapillary-signs',  layer: svgMapillarySigns(projection, context, dispatch$1) },
-               { id: 'openstreetcam', layer: svgOpenstreetcamImages(projection, context, dispatch$1) },
-               { id: 'debug', layer: svgDebug(projection, context) },
-               { id: 'geolocate', layer: svgGeolocate(projection) },
-               { id: 'touch', layer: svgTouch() }
-           ];
-
-
-           function drawLayers(selection) {
-               svg = selection.selectAll('.surface')
-                   .data([0]);
-
-               svg = svg.enter()
-                   .append('svg')
-                   .attr('class', 'surface')
-                   .merge(svg);
-
-               var defs = svg.selectAll('.surface-defs')
-                   .data([0]);
-
-               defs.enter()
-                   .append('defs')
-                   .attr('class', 'surface-defs');
-
-               var groups = svg.selectAll('.data-layer')
-                   .data(_layers);
-
-               groups.exit()
-                   .remove();
-
-               groups.enter()
-                   .append('g')
-                   .attr('class', function(d) { return 'data-layer ' + d.id; })
-                   .merge(groups)
-                   .each(function(d) { select(this).call(d.layer); });
-           }
-
-
-           drawLayers.all = function() {
-               return _layers;
-           };
+       function findItem$1(item, items, equalsFn) {
+         if (!equalsFn) return items.indexOf(item);
 
+         for (var i = 0; i < items.length; i++) {
+           if (equalsFn(item, items[i])) return i;
+         }
 
-           drawLayers.layer = function(id) {
-               var obj = _layers.find(function(o) { return o.id === id; });
-               return obj && obj.layer;
-           };
+         return -1;
+       } // calculate node's bbox from bboxes of its children
 
 
-           drawLayers.only = function(what) {
-               var arr = [].concat(what);
-               var all = _layers.map(function(layer) { return layer.id; });
-               return drawLayers.remove(utilArrayDifference(all, arr));
-           };
+       function calcBBox$1(node, toBBox) {
+         distBBox$1(node, 0, node.children.length, toBBox, node);
+       } // min bounding rectangle of node children from k to p-1
 
 
-           drawLayers.remove = function(what) {
-               var arr = [].concat(what);
-               arr.forEach(function(id) {
-                   _layers = _layers.filter(function(o) { return o.id !== id; });
-               });
-               dispatch$1.call('change');
-               return this;
-           };
+       function distBBox$1(node, k, p, toBBox, destNode) {
+         if (!destNode) destNode = createNode$1(null);
+         destNode.minX = Infinity;
+         destNode.minY = Infinity;
+         destNode.maxX = -Infinity;
+         destNode.maxY = -Infinity;
 
+         for (var i = k, child; i < p; i++) {
+           child = node.children[i];
+           extend$3(destNode, node.leaf ? toBBox(child) : child);
+         }
 
-           drawLayers.add = function(what) {
-               var arr = [].concat(what);
-               arr.forEach(function(obj) {
-                   if ('id' in obj && 'layer' in obj) {
-                       _layers.push(obj);
-                   }
-               });
-               dispatch$1.call('change');
-               return this;
-           };
+         return destNode;
+       }
 
+       function extend$3(a, b) {
+         a.minX = Math.min(a.minX, b.minX);
+         a.minY = Math.min(a.minY, b.minY);
+         a.maxX = Math.max(a.maxX, b.maxX);
+         a.maxY = Math.max(a.maxY, b.maxY);
+         return a;
+       }
 
-           drawLayers.dimensions = function(val) {
-               if (!arguments.length) return utilGetDimensions(svg);
-               utilSetDimensions(svg, val);
-               return this;
-           };
+       function compareNodeMinX$1(a, b) {
+         return a.minX - b.minX;
+       }
 
+       function compareNodeMinY$1(a, b) {
+         return a.minY - b.minY;
+       }
 
-           return utilRebind(drawLayers, dispatch$1, 'on');
+       function bboxArea$1(a) {
+         return (a.maxX - a.minX) * (a.maxY - a.minY);
        }
 
-       function svgLines(projection, context) {
-           var detected = utilDetect();
+       function bboxMargin$1(a) {
+         return a.maxX - a.minX + (a.maxY - a.minY);
+       }
 
-           var highway_stack = {
-               motorway: 0,
-               motorway_link: 1,
-               trunk: 2,
-               trunk_link: 3,
-               primary: 4,
-               primary_link: 5,
-               secondary: 6,
-               tertiary: 7,
-               unclassified: 8,
-               residential: 9,
-               service: 10,
-               footway: 11
-           };
+       function enlargedArea$1(a, b) {
+         return (Math.max(b.maxX, a.maxX) - Math.min(b.minX, a.minX)) * (Math.max(b.maxY, a.maxY) - Math.min(b.minY, a.minY));
+       }
 
+       function intersectionArea$1(a, b) {
+         var minX = Math.max(a.minX, b.minX),
+             minY = Math.max(a.minY, b.minY),
+             maxX = Math.min(a.maxX, b.maxX),
+             maxY = Math.min(a.maxY, b.maxY);
+         return Math.max(0, maxX - minX) * Math.max(0, maxY - minY);
+       }
 
-           function drawTargets(selection, graph, entities, filter) {
-               var targetClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
-               var nopeClass = context.getDebug('target') ? 'red ' : 'nocolor ';
-               var getPath = svgPath(projection).geojson;
-               var activeID = context.activeID();
-               var base = context.history().base();
+       function contains$1(a, b) {
+         return a.minX <= b.minX && a.minY <= b.minY && b.maxX <= a.maxX && b.maxY <= a.maxY;
+       }
 
-               // The targets and nopes will be MultiLineString sub-segments of the ways
-               var data = { targets: [], nopes: [] };
+       function intersects$1(a, b) {
+         return b.minX <= a.maxX && b.minY <= a.maxY && b.maxX >= a.minX && b.maxY >= a.minY;
+       }
 
-               entities.forEach(function(way) {
-                   var features = svgSegmentWay(way, graph, activeID);
-                   data.targets.push.apply(data.targets, features.passive);
-                   data.nopes.push.apply(data.nopes, features.active);
-               });
+       function createNode$1(children) {
+         return {
+           children: children,
+           height: 1,
+           leaf: true,
+           minX: Infinity,
+           minY: Infinity,
+           maxX: -Infinity,
+           maxY: -Infinity
+         };
+       } // sort an array so that items come in groups of n unsorted items, with groups sorted between each other;
+       // combines selection algorithm with binary divide & conquer approach
 
 
-               // Targets allow hover and vertex snapping
-               var targetData = data.targets.filter(getPath);
-               var targets = selection.selectAll('.line.target-allowed')
-                   .filter(function(d) { return filter(d.properties.entity); })
-                   .data(targetData, function key(d) { return d.id; });
+       function multiSelect$1(arr, left, right, n, compare) {
+         var stack = [left, right],
+             mid;
 
-               // exit
-               targets.exit()
-                   .remove();
+         while (stack.length) {
+           right = stack.pop();
+           left = stack.pop();
+           if (right - left <= n) continue;
+           mid = left + Math.ceil((right - left) / n / 2) * n;
+           quickselect$2(arr, mid, left, right, compare);
+           stack.push(left, mid, mid, right);
+         }
+       }
+       rbush_1["default"] = _default$2;
 
-               var segmentWasEdited = function(d) {
-                   var wayID = d.properties.entity.id;
-                   // if the whole line was edited, don't draw segment changes
-                   if (!base.entities[wayID] ||
-                       !fastDeepEqual(graph.entities[wayID].nodes, base.entities[wayID].nodes)) {
-                       return false;
-                   }
-                   return d.properties.nodes.some(function(n) {
-                       return !base.entities[n.id] ||
-                              !fastDeepEqual(graph.entities[n.id].loc, base.entities[n.id].loc);
-                   });
-               };
+       var lineclip_1$1 = lineclip$1;
+       lineclip$1.polyline = lineclip$1;
+       lineclip$1.polygon = polygonclip$1; // Cohen-Sutherland line clippign algorithm, adapted to efficiently
+       // handle polylines rather than just segments
 
-               // enter/update
-               targets.enter()
-                   .append('path')
-                   .merge(targets)
-                   .attr('d', getPath)
-                   .attr('class', function(d) {
-                       return 'way line target target-allowed ' + targetClass + d.id;
-                   })
-                   .classed('segment-edited', segmentWasEdited);
-
-               // NOPE
-               var nopeData = data.nopes.filter(getPath);
-               var nopes = selection.selectAll('.line.target-nope')
-                   .filter(function(d) { return filter(d.properties.entity); })
-                   .data(nopeData, function key(d) { return d.id; });
-
-               // exit
-               nopes.exit()
-                   .remove();
-
-               // enter/update
-               nopes.enter()
-                   .append('path')
-                   .merge(nopes)
-                   .attr('d', getPath)
-                   .attr('class', function(d) {
-                       return 'way line target target-nope ' + nopeClass + d.id;
-                   })
-                   .classed('segment-edited', segmentWasEdited);
-           }
-
-
-           function drawLines(selection, graph, entities, filter) {
-               var base = context.history().base();
-
-               function waystack(a, b) {
-                   var selected = context.selectedIDs();
-                   var scoreA = selected.indexOf(a.id) !== -1 ? 20 : 0;
-                   var scoreB = selected.indexOf(b.id) !== -1 ? 20 : 0;
-
-                   if (a.tags.highway) { scoreA -= highway_stack[a.tags.highway]; }
-                   if (b.tags.highway) { scoreB -= highway_stack[b.tags.highway]; }
-                   return scoreA - scoreB;
-               }
-
-
-               function drawLineGroup(selection, klass, isSelected) {
-                   // Note: Don't add `.selected` class in draw modes
-                   var mode = context.mode();
-                   var isDrawing = mode && /^draw/.test(mode.id);
-                   var selectedClass = (!isDrawing && isSelected) ? 'selected ' : '';
-
-                   var lines = selection
-                       .selectAll('path')
-                       .filter(filter)
-                       .data(getPathData(isSelected), osmEntity.key);
-
-                   lines.exit()
-                       .remove();
-
-                   // Optimization: Call expensive TagClasses only on enter selection. This
-                   // works because osmEntity.key is defined to include the entity v attribute.
-                   lines.enter()
-                       .append('path')
-                       .attr('class', function(d) {
-
-                           var prefix = 'way line';
-
-                           // if this line isn't styled by its own tags
-                           if (!d.hasInterestingTags()) {
-
-                               var parentRelations = graph.parentRelations(d);
-                               var parentMultipolygons = parentRelations.filter(function(relation) {
-                                   return relation.isMultipolygon();
-                               });
-
-                               // and if it's a member of at least one multipolygon relation
-                               if (parentMultipolygons.length > 0 &&
-                                   // and only multipolygon relations
-                                   parentRelations.length === parentMultipolygons.length) {
-                                   // then fudge the classes to style this as an area edge
-                                   prefix = 'relation area';
-                               }
-                           }
+       function lineclip$1(points, bbox, result) {
+         var len = points.length,
+             codeA = bitCode$1(points[0], bbox),
+             part = [],
+             i,
+             a,
+             b,
+             codeB,
+             lastCode;
+         if (!result) result = [];
 
-                           var oldMPClass = oldMultiPolygonOuters[d.id] ? 'old-multipolygon ' : '';
-                           return prefix + ' ' + klass + ' ' + selectedClass + oldMPClass + d.id;
-                       })
-                       .classed('added', function(d) {
-                           return !base.entities[d.id];
-                       })
-                       .classed('geometry-edited', function(d) {
-                           return graph.entities[d.id] &&
-                               base.entities[d.id] &&
-                               !fastDeepEqual(graph.entities[d.id].nodes, base.entities[d.id].nodes);
-                       })
-                       .classed('retagged', function(d) {
-                           return graph.entities[d.id] &&
-                               base.entities[d.id] &&
-                               !fastDeepEqual(graph.entities[d.id].tags, base.entities[d.id].tags);
-                       })
-                       .call(svgTagClasses())
-                       .merge(lines)
-                       .sort(waystack)
-                       .attr('d', getPath)
-                       .call(svgTagClasses().tags(svgRelationMemberTags(graph)));
+         for (i = 1; i < len; i++) {
+           a = points[i - 1];
+           b = points[i];
+           codeB = lastCode = bitCode$1(b, bbox);
 
-                   return selection;
+           while (true) {
+             if (!(codeA | codeB)) {
+               // accept
+               part.push(a);
+
+               if (codeB !== lastCode) {
+                 // segment went outside
+                 part.push(b);
+
+                 if (i < len - 1) {
+                   // start a new line
+                   result.push(part);
+                   part = [];
+                 }
+               } else if (i === len - 1) {
+                 part.push(b);
                }
 
+               break;
+             } else if (codeA & codeB) {
+               // trivial reject
+               break;
+             } else if (codeA) {
+               // a outside, intersect with clip edge
+               a = intersect$1(a, b, codeA, bbox);
+               codeA = bitCode$1(a, bbox);
+             } else {
+               // b outside
+               b = intersect$1(a, b, codeB, bbox);
+               codeB = bitCode$1(b, bbox);
+             }
+           }
 
-               function getPathData(isSelected) {
-                   return function() {
-                       var layer = this.parentNode.__data__;
-                       var data = pathdata[layer] || [];
-                       return data.filter(function(d) {
-                           if (isSelected)
-                               return context.selectedIDs().indexOf(d.id) !== -1;
-                           else
-                               return context.selectedIDs().indexOf(d.id) === -1;
-                       });
-                   };
-               }
-
-               function addMarkers(layergroup, pathclass, groupclass, groupdata, marker) {
-                   var markergroup = layergroup
-                       .selectAll('g.' + groupclass)
-                       .data([pathclass]);
+           codeA = lastCode;
+         }
 
-                   markergroup = markergroup.enter()
-                       .append('g')
-                       .attr('class', groupclass)
-                       .merge(markergroup);
+         if (part.length) result.push(part);
+         return result;
+       } // Sutherland-Hodgeman polygon clipping algorithm
 
-                   var markers = markergroup
-                       .selectAll('path')
-                       .filter(filter)
-                       .data(
-                           function data() { return groupdata[this.parentNode.__data__] || []; },
-                           function key(d) { return [d.id, d.index]; }
-                       );
 
-                   markers.exit()
-                       .remove();
+       function polygonclip$1(points, bbox) {
+         var result, edge, prev, prevInside, i, p, inside; // clip against each side of the clip rectangle
 
-                   markers = markers.enter()
-                       .append('path')
-                       .attr('class', pathclass)
-                       .merge(markers)
-                       .attr('marker-mid', marker)
-                       .attr('d', function(d) { return d.d; });
+         for (edge = 1; edge <= 8; edge *= 2) {
+           result = [];
+           prev = points[points.length - 1];
+           prevInside = !(bitCode$1(prev, bbox) & edge);
 
-                   if (detected.ie) {
-                       markers.each(function() { this.parentNode.insertBefore(this, this); });
-                   }
-               }
+           for (i = 0; i < points.length; i++) {
+             p = points[i];
+             inside = !(bitCode$1(p, bbox) & edge); // if segment goes through the clip window, add an intersection
 
+             if (inside !== prevInside) result.push(intersect$1(prev, p, edge, bbox));
+             if (inside) result.push(p); // add a point if it's inside
 
-               var getPath = svgPath(projection, graph);
-               var ways = [];
-               var onewaydata = {};
-               var sideddata = {};
-               var oldMultiPolygonOuters = {};
+             prev = p;
+             prevInside = inside;
+           }
 
-               for (var i = 0; i < entities.length; i++) {
-                   var entity = entities[i];
-                   var outer = osmOldMultipolygonOuterMember(entity, graph);
-                   if (outer) {
-                       ways.push(entity.mergeTags(outer.tags));
-                       oldMultiPolygonOuters[outer.id] = true;
-                   } else if (entity.geometry(graph) === 'line') {
-                       ways.push(entity);
-                   }
-               }
+           points = result;
+           if (!points.length) break;
+         }
 
-               ways = ways.filter(getPath);
-               var pathdata = utilArrayGroupBy(ways, function(way) { return way.layer(); });
+         return result;
+       } // intersect a segment against one of the 4 lines that make up the bbox
 
-               Object.keys(pathdata).forEach(function(k) {
-                   var v = pathdata[k];
-                   var onewayArr = v.filter(function(d) { return d.isOneWay(); });
-                   var onewaySegments = svgMarkerSegments(
-                       projection, graph, 35,
-                       function shouldReverse(entity) { return entity.tags.oneway === '-1'; },
-                       function bothDirections(entity) {
-                           return entity.tags.oneway === 'reversible' || entity.tags.oneway === 'alternating';
-                       }
-                   );
-                   onewaydata[k] = utilArrayFlatten(onewayArr.map(onewaySegments));
-
-                   var sidedArr = v.filter(function(d) { return d.isSided(); });
-                   var sidedSegments = svgMarkerSegments(
-                       projection, graph, 30,
-                       function shouldReverse() { return false; },
-                       function bothDirections() { return false; }
-                   );
-                   sideddata[k] = utilArrayFlatten(sidedArr.map(sidedSegments));
-               });
 
+       function intersect$1(a, b, edge, bbox) {
+         return edge & 8 ? [a[0] + (b[0] - a[0]) * (bbox[3] - a[1]) / (b[1] - a[1]), bbox[3]] : // top
+         edge & 4 ? [a[0] + (b[0] - a[0]) * (bbox[1] - a[1]) / (b[1] - a[1]), bbox[1]] : // bottom
+         edge & 2 ? [bbox[2], a[1] + (b[1] - a[1]) * (bbox[2] - a[0]) / (b[0] - a[0])] : // right
+         edge & 1 ? [bbox[0], a[1] + (b[1] - a[1]) * (bbox[0] - a[0]) / (b[0] - a[0])] : // left
+         null;
+       } // bit code reflects the point position relative to the bbox:
+       //         left  mid  right
+       //    top  1001  1000  1010
+       //    mid  0001  0000  0010
+       // bottom  0101  0100  0110
 
-               var covered = selection.selectAll('.layer-osm.covered');     // under areas
-               var uncovered = selection.selectAll('.layer-osm.lines');     // over areas
-               var touchLayer = selection.selectAll('.layer-touch.lines');
-
-               // Draw lines..
-               [covered, uncovered].forEach(function(selection) {
-                   var range = (selection === covered ? range$1(-10,0) : range$1(0,11));
-                   var layergroup = selection
-                       .selectAll('g.layergroup')
-                       .data(range);
-
-                   layergroup = layergroup.enter()
-                       .append('g')
-                       .attr('class', function(d) { return 'layergroup layer' + String(d); })
-                       .merge(layergroup);
-
-                   layergroup
-                       .selectAll('g.linegroup')
-                       .data(['shadow', 'casing', 'stroke', 'shadow-highlighted', 'casing-highlighted', 'stroke-highlighted'])
-                       .enter()
-                       .append('g')
-                       .attr('class', function(d) { return 'linegroup line-' + d; });
-
-                   layergroup.selectAll('g.line-shadow')
-                       .call(drawLineGroup, 'shadow', false);
-                   layergroup.selectAll('g.line-casing')
-                       .call(drawLineGroup, 'casing', false);
-                   layergroup.selectAll('g.line-stroke')
-                       .call(drawLineGroup, 'stroke', false);
-
-                   layergroup.selectAll('g.line-shadow-highlighted')
-                       .call(drawLineGroup, 'shadow', true);
-                   layergroup.selectAll('g.line-casing-highlighted')
-                       .call(drawLineGroup, 'casing', true);
-                   layergroup.selectAll('g.line-stroke-highlighted')
-                       .call(drawLineGroup, 'stroke', true);
-
-                   addMarkers(layergroup, 'oneway', 'onewaygroup', onewaydata, 'url(#ideditor-oneway-marker)');
-                   addMarkers(layergroup, 'sided', 'sidedgroup', sideddata,
-                       function marker(d) {
-                           var category = graph.entity(d.id).sidednessIdentifier();
-                           return 'url(#ideditor-sided-marker-' + category + ')';
-                       }
-                   );
-               });
 
-               // Draw touch targets..
-               touchLayer
-                   .call(drawTargets, graph, ways, filter);
-           }
+       function bitCode$1(p, bbox) {
+         var code = 0;
+         if (p[0] < bbox[0]) code |= 1; // left
+         else if (p[0] > bbox[2]) code |= 2; // right
 
+         if (p[1] < bbox[1]) code |= 4; // bottom
+         else if (p[1] > bbox[3]) code |= 8; // top
 
-           return drawLines;
+         return code;
        }
 
-       function svgMidpoints(projection, context) {
-           var targetRadius = 8;
-
-           function drawTargets(selection, graph, entities, filter) {
-               var fillClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
-               var getTransform = svgPointTransform(projection).geojson;
-
-               var data = entities.map(function(midpoint) {
-                   return {
-                       type: 'Feature',
-                       id: midpoint.id,
-                       properties: {
-                           target: true,
-                           entity: midpoint
-                       },
-                       geometry: {
-                           type: 'Point',
-                           coordinates: midpoint.loc
-                       }
-                   };
-               });
+       var whichPolygon_1 = whichPolygon;
 
-               var targets = selection.selectAll('.midpoint.target')
-                   .filter(function(d) { return filter(d.properties.entity); })
-                   .data(data, function key(d) { return d.id; });
+       function whichPolygon(data) {
+         var bboxes = [];
 
-               // exit
-               targets.exit()
-                   .remove();
+         for (var i = 0; i < data.features.length; i++) {
+           var feature = data.features[i];
+           var coords = feature.geometry.coordinates;
 
-               // enter/update
-               targets.enter()
-                   .append('circle')
-                   .attr('r', targetRadius)
-                   .merge(targets)
-                   .attr('class', function(d) { return 'node midpoint target ' + fillClass + d.id; })
-                   .attr('transform', getTransform);
+           if (feature.geometry.type === 'Polygon') {
+             bboxes.push(treeItem(coords, feature.properties));
+           } else if (feature.geometry.type === 'MultiPolygon') {
+             for (var j = 0; j < coords.length; j++) {
+               bboxes.push(treeItem(coords[j], feature.properties));
+             }
            }
+         }
 
+         var tree = rbush_1().load(bboxes);
 
-           function drawMidpoints(selection, graph, entities, filter, extent) {
-               var drawLayer = selection.selectAll('.layer-osm.points .points-group.midpoints');
-               var touchLayer = selection.selectAll('.layer-touch.points');
-
-               var mode = context.mode();
-               if ((mode && mode.id !== 'select') || !context.map().withinEditableZoom()) {
-                   drawLayer.selectAll('.midpoint').remove();
-                   touchLayer.selectAll('.midpoint.target').remove();
-                   return;
-               }
-
-               var poly = extent.polygon();
-               var midpoints = {};
-
-               for (var i = 0; i < entities.length; i++) {
-                   var entity = entities[i];
-
-                   if (entity.type !== 'way') continue;
-                   if (!filter(entity)) continue;
-                   if (context.selectedIDs().indexOf(entity.id) < 0) continue;
-
-                   var nodes = graph.childNodes(entity);
-                   for (var j = 0; j < nodes.length - 1; j++) {
-                       var a = nodes[j];
-                       var b = nodes[j + 1];
-                       var id = [a.id, b.id].sort().join('-');
-
-                       if (midpoints[id]) {
-                           midpoints[id].parents.push(entity);
-                       } else if (geoVecLength(projection(a.loc), projection(b.loc)) > 40) {
-                           var point = geoVecInterp(a.loc, b.loc, 0.5);
-                           var loc = null;
-
-                           if (extent.intersects(point)) {
-                               loc = point;
-                           } else {
-                               for (var k = 0; k < 4; k++) {
-                                   point = geoLineIntersection([a.loc, b.loc], [poly[k], poly[k + 1]]);
-                                   if (point &&
-                                       geoVecLength(projection(a.loc), projection(point)) > 20 &&
-                                       geoVecLength(projection(b.loc), projection(point)) > 20)
-                                   {
-                                       loc = point;
-                                       break;
-                                   }
-                               }
-                           }
-
-                           if (loc) {
-                               midpoints[id] = {
-                                   type: 'midpoint',
-                                   id: id,
-                                   loc: loc,
-                                   edge: [a.id, b.id],
-                                   parents: [entity]
-                               };
-                           }
-                       }
-                   }
-               }
+         function query(p, multi) {
+           var output = [],
+               result = tree.search({
+             minX: p[0],
+             minY: p[1],
+             maxX: p[0],
+             maxY: p[1]
+           });
 
+           for (var i = 0; i < result.length; i++) {
+             if (insidePolygon(result[i].coords, p)) {
+               if (multi) output.push(result[i].props);else return result[i].props;
+             }
+           }
 
-               function midpointFilter(d) {
-                   if (midpoints[d.id])
-                       return true;
+           return multi && output.length ? output : null;
+         }
 
-                   for (var i = 0; i < d.parents.length; i++) {
-                       if (filter(d.parents[i])) {
-                           return true;
-                       }
-                   }
+         query.tree = tree;
 
-                   return false;
-               }
+         query.bbox = function queryBBox(bbox) {
+           var output = [];
+           var result = tree.search({
+             minX: bbox[0],
+             minY: bbox[1],
+             maxX: bbox[2],
+             maxY: bbox[3]
+           });
 
+           for (var i = 0; i < result.length; i++) {
+             if (polygonIntersectsBBox(result[i].coords, bbox)) {
+               output.push(result[i].props);
+             }
+           }
 
-               var groups = drawLayer.selectAll('.midpoint')
-                   .filter(midpointFilter)
-                   .data(Object.values(midpoints), function(d) { return d.id; });
+           return output;
+         };
 
-               groups.exit()
-                   .remove();
+         return query;
+       }
 
-               var enter = groups.enter()
-                   .insert('g', ':first-child')
-                   .attr('class', 'midpoint');
+       function polygonIntersectsBBox(polygon, bbox) {
+         var bboxCenter = [(bbox[0] + bbox[2]) / 2, (bbox[1] + bbox[3]) / 2];
+         if (insidePolygon(polygon, bboxCenter)) return true;
 
-               enter
-                   .append('polygon')
-                   .attr('points', '-6,8 10,0 -6,-8')
-                   .attr('class', 'shadow');
+         for (var i = 0; i < polygon.length; i++) {
+           if (lineclip_1$1(polygon[i], bbox).length > 0) return true;
+         }
 
-               enter
-                   .append('polygon')
-                   .attr('points', '-3,4 5,0 -3,-4')
-                   .attr('class', 'fill');
+         return false;
+       } // ray casting algorithm for detecting if point is in polygon
 
-               groups = groups
-                   .merge(enter)
-                   .attr('transform', function(d) {
-                       var translate = svgPointTransform(projection);
-                       var a = graph.entity(d.edge[0]);
-                       var b = graph.entity(d.edge[1]);
-                       var angle = geoAngle(a, b, projection) * (180 / Math.PI);
-                       return translate(d) + ' rotate(' + angle + ')';
-                   })
-                   .call(svgTagClasses().tags(
-                       function(d) { return d.parents[0].tags; }
-                   ));
 
-               // Propagate data bindings.
-               groups.select('polygon.shadow');
-               groups.select('polygon.fill');
+       function insidePolygon(rings, p) {
+         var inside = false;
 
+         for (var i = 0, len = rings.length; i < len; i++) {
+           var ring = rings[i];
 
-               // Draw touch targets..
-               touchLayer
-                   .call(drawTargets, graph, Object.values(midpoints), midpointFilter);
+           for (var j = 0, len2 = ring.length, k = len2 - 1; j < len2; k = j++) {
+             if (rayIntersect(p, ring[j], ring[k])) inside = !inside;
            }
+         }
 
-           return drawMidpoints;
+         return inside;
        }
 
-       function svgPoints(projection, context) {
-
-           function markerPath(selection, klass) {
-               selection
-                   .attr('class', klass)
-                   .attr('transform', 'translate(-8, -23)')
-                   .attr('d', 'M 17,8 C 17,13 11,21 8.5,23.5 C 6,21 0,13 0,8 C 0,4 4,-0.5 8.5,-0.5 C 13,-0.5 17,4 17,8 z');
-           }
+       function rayIntersect(p, p1, p2) {
+         return p1[1] > p[1] !== p2[1] > p[1] && p[0] < (p2[0] - p1[0]) * (p[1] - p1[1]) / (p2[1] - p1[1]) + p1[0];
+       }
 
-           function sortY(a, b) {
-               return b.loc[1] - a.loc[1];
-           }
+       function treeItem(coords, props) {
+         var item = {
+           minX: Infinity,
+           minY: Infinity,
+           maxX: -Infinity,
+           maxY: -Infinity,
+           coords: coords,
+           props: props
+         };
 
+         for (var i = 0; i < coords[0].length; i++) {
+           var p = coords[0][i];
+           item.minX = Math.min(item.minX, p[0]);
+           item.minY = Math.min(item.minY, p[1]);
+           item.maxX = Math.max(item.maxX, p[0]);
+           item.maxY = Math.max(item.maxY, p[1]);
+         }
 
-           // Avoid exit/enter if we're just moving stuff around.
-           // The node will get a new version but we only need to run the update selection.
-           function fastEntityKey(d) {
-               var mode = context.mode();
-               var isMoving = mode && /^(add|draw|drag|move|rotate)/.test(mode.id);
-               return isMoving ? d.id : osmEntity.key(d);
-           }
+         return item;
+       }
 
+       var type = "FeatureCollection";
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+       var rawBorders = {
+       type: type,
+       features: features
+       };
 
-           function drawTargets(selection, graph, entities, filter) {
-               var fillClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
-               var getTransform = svgPointTransform(projection).geojson;
-               var activeID = context.activeID();
-               var data = [];
+       var borders = rawBorders;
+       var whichPolygonGetter = {};
+       var featuresByCode = {};
+       var idFilterRegex = /\bThe\b|\bthe\b|\band\b|\bof\b|[-_ .,()&[\]/]/g;
+       var levels = ['subterritory', 'territory', 'country', 'intermediateRegion', 'subregion', 'region', 'union', 'world'];
+       loadDerivedDataAndCaches(borders);
 
-               entities.forEach(function(node) {
-                   if (activeID === node.id) return;   // draw no target on the activeID
+       function loadDerivedDataAndCaches(borders) {
+         var identifierProps = ['iso1A2', 'iso1A3', 'm49', 'wikidata', 'emojiFlag', 'nameEn'];
+         var geometryFeatures = [];
+
+         for (var i in borders.features) {
+           var _feature = borders.features[i];
+           _feature.properties.id = _feature.properties.iso1A2 || _feature.properties.m49;
+           loadM49(_feature);
+           loadIsoStatus(_feature);
+           loadLevel(_feature);
+           loadGroups(_feature);
+           loadRoadSpeedUnit(_feature);
+           loadDriveSide(_feature);
+           loadFlag(_feature);
+           cacheFeatureByIDs(_feature);
+           if (_feature.geometry) geometryFeatures.push(_feature);
+         }
+
+         for (var _i in borders.features) {
+           var _feature2 = borders.features[_i];
+
+           _feature2.properties.groups.sort(function (groupID1, groupID2) {
+             return levels.indexOf(featuresByCode[groupID1].properties.level) - levels.indexOf(featuresByCode[groupID2].properties.level);
+           });
 
-                   data.push({
-                       type: 'Feature',
-                       id: node.id,
-                       properties: {
-                           target: true,
-                           entity: node
-                       },
-                       geometry: node.asGeoJSON()
-                   });
-               });
+           loadMembersForGroupsOf(_feature2);
+         }
 
-               var targets = selection.selectAll('.point.target')
-                   .filter(function(d) { return filter(d.properties.entity); })
-                   .data(data, function key(d) { return d.id; });
-
-               // exit
-               targets.exit()
-                   .remove();
-
-               // enter/update
-               targets.enter()
-                   .append('rect')
-                   .attr('x', -10)
-                   .attr('y', -26)
-                   .attr('width', 20)
-                   .attr('height', 30)
-                   .merge(targets)
-                   .attr('class', function(d) { return 'node point target ' + fillClass + d.id; })
-                   .attr('transform', getTransform);
-           }
-
-
-           function drawPoints(selection, graph, entities, filter) {
-               var wireframe = context.surface().classed('fill-wireframe');
-               var zoom = geoScaleToZoom(projection.scale());
-               var base = context.history().base();
-
-               // Points with a direction will render as vertices at higher zooms..
-               function renderAsPoint(entity) {
-                   return entity.geometry(graph) === 'point' &&
-                       !(zoom >= 18 && entity.directions(graph, projection).length);
-               }
-
-               // All points will render as vertices in wireframe mode too..
-               var points = wireframe ? [] : entities.filter(renderAsPoint);
-               points.sort(sortY);
-
-
-               var drawLayer = selection.selectAll('.layer-osm.points .points-group.points');
-               var touchLayer = selection.selectAll('.layer-touch.points');
-
-               // Draw points..
-               var groups = drawLayer.selectAll('g.point')
-                   .filter(filter)
-                   .data(points, fastEntityKey);
-
-               groups.exit()
-                   .remove();
-
-               var enter = groups.enter()
-                   .append('g')
-                   .attr('class', function(d) { return 'node point ' + d.id; })
-                   .order();
-
-               enter
-                   .append('path')
-                   .call(markerPath, 'shadow');
-
-               enter
-                   .append('ellipse')
-                   .attr('cx', 0.5)
-                   .attr('cy', 1)
-                   .attr('rx', 6.5)
-                   .attr('ry', 3)
-                   .attr('class', 'stroke');
-
-               enter
-                   .append('path')
-                   .call(markerPath, 'stroke');
-
-               enter
-                   .append('use')
-                   .attr('transform', 'translate(-5, -19)')
-                   .attr('class', 'icon')
-                   .attr('width', '11px')
-                   .attr('height', '11px');
-
-               groups = groups
-                   .merge(enter)
-                   .attr('transform', svgPointTransform(projection))
-                   .classed('added', function(d) {
-                       return !base.entities[d.id]; // if it doesn't exist in the base graph, it's new
-                   })
-                   .classed('moved', function(d) {
-                       return base.entities[d.id] && !fastDeepEqual(graph.entities[d.id].loc, base.entities[d.id].loc);
-                   })
-                   .classed('retagged', function(d) {
-                       return base.entities[d.id] && !fastDeepEqual(graph.entities[d.id].tags, base.entities[d.id].tags);
-                   })
-                   .call(svgTagClasses());
-
-               groups.select('.shadow');   // propagate bound data
-               groups.select('.stroke');   // propagate bound data
-               groups.select('.icon')      // propagate bound data
-                   .attr('xlink:href', function(entity) {
-                       var preset = _mainPresetIndex.match(entity, graph);
-                       var picon = preset && preset.icon;
-
-                       if (!picon) {
-                           return '';
-                       } else {
-                           var isMaki = /^maki-/.test(picon);
-                           return '#' + picon + (isMaki ? '-11' : '');
-                       }
-                   });
+         var geometryOnlyCollection = {
+           type: 'RegionFeatureCollection',
+           features: geometryFeatures
+         };
+         whichPolygonGetter = whichPolygon_1(geometryOnlyCollection);
 
+         function loadGroups(feature) {
+           var props = feature.properties;
 
-               // Draw touch targets..
-               touchLayer
-                   .call(drawTargets, graph, points, filter);
+           if (!props.groups) {
+             props.groups = [];
            }
 
+           if (props.country) {
+             props.groups.push(props.country);
+           }
 
-           return drawPoints;
-       }
-
-       function svgTurns(projection, context) {
-
-           function icon(turn) {
-               var u = turn.u ? '-u' : '';
-               if (turn.no) return '#iD-turn-no' + u;
-               if (turn.only) return '#iD-turn-only' + u;
-               return '#iD-turn-yes' + u;
+           if (props.m49 !== '001') {
+             props.groups.push('001');
            }
+         }
 
-           function drawTurns(selection, graph, turns) {
+         function loadM49(feature) {
+           var props = feature.properties;
 
-               function turnTransform(d) {
-                   var pxRadius = 50;
-                   var toWay = graph.entity(d.to.way);
-                   var toPoints = graph.childNodes(toWay)
-                       .map(function (n) { return n.loc; })
-                       .map(projection);
-                   var toLength = geoPathLength(toPoints);
-                   var mid = toLength / 2;    // midpoint of destination way
+           if (!props.m49 && props.iso1N3) {
+             props.m49 = props.iso1N3;
+           }
+         }
 
-                   var toNode = graph.entity(d.to.node);
-                   var toVertex = graph.entity(d.to.vertex);
-                   var a = geoAngle(toVertex, toNode, projection);
-                   var o = projection(toVertex.loc);
-                   var r = d.u ? 0                  // u-turn: no radius
-                       : !toWay.__via ? pxRadius    // leaf way: put marker at pxRadius
-                       : Math.min(mid, pxRadius);   // via way: prefer pxRadius, fallback to mid for very short ways
+         function loadIsoStatus(feature) {
+           var props = feature.properties;
 
-                   return 'translate(' + (r * Math.cos(a) + o[0]) + ',' + (r * Math.sin(a) + o[1]) + ') ' +
-                       'rotate(' + a * 180 / Math.PI + ')';
-               }
+           if (!props.isoStatus && props.iso1A2) {
+             props.isoStatus = 'official';
+           }
+         }
 
+         function loadLevel(feature) {
+           var props = feature.properties;
+           if (props.level) return;
 
-               var drawLayer = selection.selectAll('.layer-osm.points .points-group.turns');
-               var touchLayer = selection.selectAll('.layer-touch.turns');
+           if (!props.country) {
+             props.level = 'country';
+           } else if (props.isoStatus === 'official') {
+             props.level = 'territory';
+           } else {
+             props.level = 'subterritory';
+           }
+         }
 
-               // Draw turns..
-               var groups = drawLayer.selectAll('g.turn')
-                   .data(turns, function(d) { return d.key; });
+         function loadRoadSpeedUnit(feature) {
+           var props = feature.properties;
 
-               // exit
-               groups.exit()
-                   .remove();
+           if (props.roadSpeedUnit === undefined && props.iso1A2 && props.iso1A2 !== 'EU') {
+             props.roadSpeedUnit = 'km/h';
+           }
+         }
 
-               // enter
-               var groupsEnter = groups.enter()
-                   .append('g')
-                   .attr('class', function(d) { return 'turn ' + d.key; });
+         function loadDriveSide(feature) {
+           var props = feature.properties;
 
-               var turnsEnter = groupsEnter
-                   .filter(function(d) { return !d.u; });
+           if (props.driveSide === undefined && props.iso1A2 && props.iso1A2 !== 'EU') {
+             props.driveSide = 'right';
+           }
+         }
 
-               turnsEnter.append('rect')
-                   .attr('transform', 'translate(-22, -12)')
-                   .attr('width', '44')
-                   .attr('height', '24');
+         function loadFlag(feature) {
+           if (!feature.properties.iso1A2) return;
+           var flag = feature.properties.iso1A2.replace(/./g, function (_char) {
+             return String.fromCodePoint(_char.charCodeAt(0) + 127397);
+           });
+           feature.properties.emojiFlag = flag;
+         }
 
-               turnsEnter.append('use')
-                   .attr('transform', 'translate(-22, -12)')
-                   .attr('width', '44')
-                   .attr('height', '24');
+         function loadMembersForGroupsOf(feature) {
+           var featureID = feature.properties.id;
+           var standardizedGroupIDs = [];
 
-               var uEnter = groupsEnter
-                   .filter(function(d) { return d.u; });
+           for (var j in feature.properties.groups) {
+             var groupID = feature.properties.groups[j];
+             var groupFeature = featuresByCode[groupID];
+             standardizedGroupIDs.push(groupFeature.properties.id);
 
-               uEnter.append('circle')
-                   .attr('r', '16');
+             if (groupFeature.properties.members) {
+               groupFeature.properties.members.push(featureID);
+             } else {
+               groupFeature.properties.members = [featureID];
+             }
+           }
 
-               uEnter.append('use')
-                   .attr('transform', 'translate(-16, -16)')
-                   .attr('width', '32')
-                   .attr('height', '32');
+           feature.properties.groups = standardizedGroupIDs;
+         }
 
-               // update
-               groups = groups
-                   .merge(groupsEnter)
-                   .attr('opacity', function(d) { return d.direct === false ? '0.7' : null; })
-                   .attr('transform', turnTransform);
+         function cacheFeatureByIDs(feature) {
+           for (var k in identifierProps) {
+             var prop = identifierProps[k];
+             var id = prop && feature.properties[prop];
 
-               groups.select('use')
-                   .attr('xlink:href', icon);
+             if (id) {
+               id = id.replace(idFilterRegex, '').toUpperCase();
+               featuresByCode[id] = feature;
+             }
+           }
 
-               groups.select('rect');      // propagate bound data
-               groups.select('circle');    // propagate bound data
+           if (feature.properties.aliases) {
+             for (var j in feature.properties.aliases) {
+               var alias = feature.properties.aliases[j].replace(idFilterRegex, '').toUpperCase();
+               featuresByCode[alias] = feature;
+             }
+           }
+         }
+       }
 
+       function locArray(loc) {
+         if (Array.isArray(loc)) {
+           return loc;
+         } else if (loc.coordinates) {
+           return loc.coordinates;
+         }
 
-               // Draw touch targets..
-               var fillClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
-               groups = touchLayer.selectAll('g.turn')
-                   .data(turns, function(d) { return d.key; });
+         return loc.geometry.coordinates;
+       }
 
-               // exit
-               groups.exit()
-                   .remove();
+       function smallestFeature(loc) {
+         var query = locArray(loc);
+         var featureProperties = whichPolygonGetter(query);
+         if (!featureProperties) return null;
+         return featuresByCode[featureProperties.id];
+       }
 
-               // enter
-               groupsEnter = groups.enter()
-                   .append('g')
-                   .attr('class', function(d) { return 'turn ' + d.key; });
+       function countryFeature(loc) {
+         var feature = smallestFeature(loc);
+         if (!feature) return null;
+         var countryCode = feature.properties.country || feature.properties.iso1A2;
+         return featuresByCode[countryCode];
+       }
 
-               turnsEnter = groupsEnter
-                   .filter(function(d) { return !d.u; });
+       function featureForLoc(loc, opts) {
+         if (opts && opts.level && opts.level !== 'country') {
+           var features = featuresContaining(loc);
+           var targetLevel = opts.level;
+           var targetLevelIndex = levels.indexOf(targetLevel);
+           if (targetLevelIndex === -1) return null;
 
-               turnsEnter.append('rect')
-                   .attr('class', 'target ' + fillClass)
-                   .attr('transform', 'translate(-22, -12)')
-                   .attr('width', '44')
-                   .attr('height', '24');
+           for (var i in features) {
+             var _feature3 = features[i];
 
-               uEnter = groupsEnter
-                   .filter(function(d) { return d.u; });
+             if (_feature3.properties.level === targetLevel || levels.indexOf(_feature3.properties.level) > targetLevelIndex) {
+               return _feature3;
+             }
+           }
 
-               uEnter.append('circle')
-                   .attr('class', 'target ' + fillClass)
-                   .attr('r', '16');
+           return null;
+         }
 
-               // update
-               groups = groups
-                   .merge(groupsEnter)
-                   .attr('transform', turnTransform);
+         return countryFeature(loc);
+       }
 
-               groups.select('rect');      // propagate bound data
-               groups.select('circle');    // propagate bound data
+       function featureForID(id) {
+         var stringID;
 
+         if (typeof id === 'number') {
+           stringID = id.toString();
 
-               return this;
+           if (stringID.length === 1) {
+             stringID = '00' + stringID;
+           } else if (stringID.length === 2) {
+             stringID = '0' + stringID;
            }
+         } else {
+           stringID = id.replace(idFilterRegex, '').toUpperCase();
+         }
 
-           return drawTurns;
+         return featuresByCode[stringID] || null;
        }
 
-       function svgVertices(projection, context) {
-           var radiuses = {
-               //       z16-, z17,   z18+,  w/icon
-               shadow: [6,    7.5,   7.5,   12],
-               stroke: [2.5,  3.5,   3.5,   8],
-               fill:   [1,    1.5,   1.5,   1.5]
-           };
+       function smallestOrMatchingFeature(query) {
+         if (_typeof(query) === 'object') {
+           return smallestFeature(query);
+         }
 
-           var _currHoverTarget;
-           var _currPersistent = {};
-           var _currHover = {};
-           var _prevHover = {};
-           var _currSelected = {};
-           var _prevSelected = {};
-           var _radii = {};
+         return featureForID(query);
+       }
 
+       function feature(query, opts) {
+         if (_typeof(query) === 'object') {
+           return featureForLoc(query, opts);
+         }
 
-           function sortY(a, b) {
-               return b.loc[1] - a.loc[1];
-           }
+         return featureForID(query);
+       }
+       function iso1A2Code(query, opts) {
+         var match = feature(query, opts);
+         if (!match) return null;
+         return match.properties.iso1A2 || null;
+       }
+       function featuresContaining(query, strict) {
+         var feature = smallestOrMatchingFeature(query);
+         if (!feature) return [];
+         var features = [];
 
-           // Avoid exit/enter if we're just moving stuff around.
-           // The node will get a new version but we only need to run the update selection.
-           function fastEntityKey(d) {
-               var mode = context.mode();
-               var isMoving = mode && /^(add|draw|drag|move|rotate)/.test(mode.id);
-               return isMoving ? d.id : osmEntity.key(d);
-           }
+         if (!strict || _typeof(query) === 'object') {
+           features.push(feature);
+         }
 
+         var properties = feature.properties;
 
-           function draw(selection, graph, vertices, sets, filter) {
-               sets = sets || { selected: {}, important: {}, hovered: {} };
+         for (var i in properties.groups) {
+           var groupID = properties.groups[i];
+           features.push(featuresByCode[groupID]);
+         }
 
-               var icons = {};
-               var directions = {};
-               var wireframe = context.surface().classed('fill-wireframe');
-               var zoom = geoScaleToZoom(projection.scale());
-               var z = (zoom < 17 ? 0 : zoom < 18 ? 1 : 2);
-               var activeID = context.activeID();
-               var base = context.history().base();
+         return features;
+       }
+       function roadSpeedUnit(query) {
+         var feature = smallestOrMatchingFeature(query);
+         return feature && feature.properties.roadSpeedUnit || null;
+       }
 
+       var _dataDeprecated;
 
-               function getIcon(d) {
-                   // always check latest entity, as fastEntityKey avoids enter/exit now
-                   var entity = graph.entity(d.id);
-                   if (entity.id in icons) return icons[entity.id];
+       var _nsi;
 
-                   icons[entity.id] =
-                       entity.hasInterestingTags() &&
-                       _mainPresetIndex.match(entity, graph).icon;
+       function validationOutdatedTags() {
+         var type = 'outdated_tags';
+         var nsiKeys = ['amenity', 'shop', 'tourism', 'leisure', 'office']; // A concern here in switching to async data means that `_dataDeprecated`
+         // and `_nsi` will not be available at first, so the data on early tiles
+         // may not have tags validated fully.
+         // initialize deprecated tags array
 
-                   return icons[entity.id];
-               }
+         _mainFileFetcher.get('deprecated').then(function (d) {
+           return _dataDeprecated = d;
+         })["catch"](function () {
+           /* ignore */
+         });
+         _mainFileFetcher.get('nsi_brands').then(function (d) {
+           _nsi = {
+             brands: d.brands,
+             matcher: matcher$1(),
+             wikidata: {},
+             wikipedia: {}
+           }; // initialize name-suggestion-index matcher
 
+           _nsi.matcher.buildMatchIndex(d.brands); // index all known wikipedia and wikidata tags
 
-               // memoize directions results, return false for empty arrays (for use in filter)
-               function getDirections(entity) {
-                   if (entity.id in directions) return directions[entity.id];
 
-                   var angles = entity.directions(graph, projection);
-                   directions[entity.id] = angles.length ? angles : false;
-                   return angles;
-               }
+           Object.keys(d.brands).forEach(function (kvnd) {
+             var brand = d.brands[kvnd];
+             var wd = brand.tags['brand:wikidata'];
+             var wp = brand.tags['brand:wikipedia'];
 
+             if (wd) {
+               _nsi.wikidata[wd] = kvnd;
+             }
 
-               function updateAttributes(selection) {
-                   ['shadow', 'stroke', 'fill'].forEach(function(klass) {
-                       var rads = radiuses[klass];
-                       selection.selectAll('.' + klass)
-                           .each(function(entity) {
-                               var i = z && getIcon(entity);
-                               var r = rads[i ? 3 : z];
+             if (wp) {
+               _nsi.wikipedia[wp] = kvnd;
+             }
+           });
+           return _nsi;
+         })["catch"](function () {
+           /* ignore */
+         });
 
-                               // slightly increase the size of unconnected endpoints #3775
-                               if (entity.id !== activeID && entity.isEndpoint(graph) && !entity.isConnected(graph)) {
-                                   r += 1.5;
-                               }
+         function oldTagIssues(entity, graph) {
+           var oldTags = Object.assign({}, entity.tags); // shallow copy
 
-                               if (klass === 'shadow') {   // remember this value, so we don't need to
-                                   _radii[entity.id] = r;  // recompute it when we draw the touch targets
-                               }
+           var preset = _mainPresetIndex.match(entity, graph);
+           var subtype = 'deprecated_tags';
+           if (!preset) return []; // upgrade preset..
 
-                               select(this)
-                                   .attr('r', r)
-                                   .attr('visibility', (i && klass === 'fill') ? 'hidden' : null);
-                           });
-                   });
-               }
+           if (preset.replacement) {
+             var newPreset = _mainPresetIndex.item(preset.replacement);
+             graph = actionChangePreset(entity.id, preset, newPreset, true
+             /* skip field defaults */
+             )(graph);
+             entity = graph.entity(entity.id);
+             preset = newPreset;
+           } // upgrade tags..
 
-               vertices.sort(sortY);
-
-               var groups = selection.selectAll('g.vertex')
-                   .filter(filter)
-                   .data(vertices, fastEntityKey);
-
-               // exit
-               groups.exit()
-                   .remove();
-
-               // enter
-               var enter = groups.enter()
-                   .append('g')
-                   .attr('class', function(d) { return 'node vertex ' + d.id; })
-                   .order();
-
-               enter
-                   .append('circle')
-                   .attr('class', 'shadow');
-
-               enter
-                   .append('circle')
-                   .attr('class', 'stroke');
-
-               // Vertices with tags get a fill.
-               enter.filter(function(d) { return d.hasInterestingTags(); })
-                   .append('circle')
-                   .attr('class', 'fill');
-
-               // update
-               groups = groups
-                   .merge(enter)
-                   .attr('transform', svgPointTransform(projection))
-                   .classed('sibling', function(d) { return d.id in sets.selected; })
-                   .classed('shared', function(d) { return graph.isShared(d); })
-                   .classed('endpoint', function(d) { return d.isEndpoint(graph); })
-                   .classed('added', function(d) {
-                       return !base.entities[d.id]; // if it doesn't exist in the base graph, it's new
-                   })
-                   .classed('moved', function(d) {
-                       return base.entities[d.id] && !fastDeepEqual(graph.entities[d.id].loc, base.entities[d.id].loc);
-                   })
-                   .classed('retagged', function(d) {
-                       return base.entities[d.id] && !fastDeepEqual(graph.entities[d.id].tags, base.entities[d.id].tags);
-                   })
-                   .call(updateAttributes);
-
-               // Vertices with icons get a `use`.
-               var iconUse = groups
-                   .selectAll('.icon')
-                   .data(function data(d) { return zoom >= 17 && getIcon(d) ? [d] : []; }, fastEntityKey);
-
-               // exit
-               iconUse.exit()
-                   .remove();
-
-               // enter
-               iconUse.enter()
-                   .append('use')
-                   .attr('class', 'icon')
-                   .attr('width', '11px')
-                   .attr('height', '11px')
-                   .attr('transform', 'translate(-5.5, -5.5)')
-                   .attr('xlink:href', function(d) {
-                       var picon = getIcon(d);
-                       var isMaki = /^maki-/.test(picon);
-                       return '#' + picon + (isMaki ? '-11' : '');
-                   });
 
+           if (_dataDeprecated) {
+             var deprecatedTags = entity.deprecatedTags(_dataDeprecated);
 
-               // Vertices with directions get viewfields
-               var dgroups = groups
-                   .selectAll('.viewfieldgroup')
-                   .data(function data(d) { return zoom >= 18 && getDirections(d) ? [d] : []; }, fastEntityKey);
-
-               // exit
-               dgroups.exit()
-                   .remove();
-
-               // enter/update
-               dgroups = dgroups.enter()
-                   .insert('g', '.shadow')
-                   .attr('class', 'viewfieldgroup')
-                   .merge(dgroups);
-
-               var viewfields = dgroups.selectAll('.viewfield')
-                   .data(getDirections, function key(d) { return osmEntity.key(d); });
-
-               // exit
-               viewfields.exit()
-                   .remove();
-
-               // enter/update
-               viewfields.enter()
-                   .append('path')
-                   .attr('class', 'viewfield')
-                   .attr('d', 'M0,0H0')
-                   .merge(viewfields)
-                   .attr('marker-start', 'url(#ideditor-viewfield-marker' + (wireframe ? '-wireframe' : '') + ')')
-                   .attr('transform', function(d) { return 'rotate(' + d + ')'; });
-           }
-
-
-           function drawTargets(selection, graph, entities, filter) {
-               var targetClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
-               var nopeClass = context.getDebug('target') ? 'red ' : 'nocolor ';
-               var getTransform = svgPointTransform(projection).geojson;
-               var activeID = context.activeID();
-               var data = { targets: [], nopes: [] };
-
-               entities.forEach(function(node) {
-                   if (activeID === node.id) return;   // draw no target on the activeID
-
-                   var vertexType = svgPassiveVertex(node, graph, activeID);
-                   if (vertexType !== 0) {     // passive or adjacent - allow to connect
-                       data.targets.push({
-                           type: 'Feature',
-                           id: node.id,
-                           properties: {
-                               target: true,
-                               entity: node
-                           },
-                           geometry: node.asGeoJSON()
-                       });
-                   } else {
-                       data.nopes.push({
-                           type: 'Feature',
-                           id: node.id + '-nope',
-                           properties: {
-                               nope: true,
-                               target: true,
-                               entity: node
-                           },
-                           geometry: node.asGeoJSON()
-                       });
-                   }
+             if (deprecatedTags.length) {
+               deprecatedTags.forEach(function (tag) {
+                 graph = actionUpgradeTags(entity.id, tag.old, tag.replace)(graph);
                });
+               entity = graph.entity(entity.id);
+             }
+           } // add missing addTags..
 
-               // Targets allow hover and vertex snapping
-               var targets = selection.selectAll('.vertex.target-allowed')
-                   .filter(function(d) { return filter(d.properties.entity); })
-                   .data(data.targets, function key(d) { return d.id; });
-
-               // exit
-               targets.exit()
-                   .remove();
-
-               // enter/update
-               targets.enter()
-                   .append('circle')
-                   .attr('r', function(d) {
-                       return _radii[d.id]
-                         || radiuses.shadow[3];
-                   })
-                   .merge(targets)
-                   .attr('class', function(d) {
-                       return 'node vertex target target-allowed '
-                       + targetClass + d.id;
-                   })
-                   .attr('transform', getTransform);
-
-
-               // NOPE
-               var nopes = selection.selectAll('.vertex.target-nope')
-                   .filter(function(d) { return filter(d.properties.entity); })
-                   .data(data.nopes, function key(d) { return d.id; });
-
-               // exit
-               nopes.exit()
-                   .remove();
-
-               // enter/update
-               nopes.enter()
-                   .append('circle')
-                   .attr('r', function(d) { return (_radii[d.properties.entity.id] || radiuses.shadow[3]); })
-                   .merge(nopes)
-                   .attr('class', function(d) { return 'node vertex target target-nope ' + nopeClass + d.id; })
-                   .attr('transform', getTransform);
-           }
-
-
-           // Points can also render as vertices:
-           // 1. in wireframe mode or
-           // 2. at higher zooms if they have a direction
-           function renderAsVertex(entity, graph, wireframe, zoom) {
-               var geometry = entity.geometry(graph);
-               return geometry === 'vertex' || (geometry === 'point' && (
-                   wireframe || (zoom >= 18 && entity.directions(graph, projection).length)
-               ));
-           }
-
-
-           function isEditedNode(node, base, head) {
-               var baseNode = base.entities[node.id];
-               var headNode = head.entities[node.id];
-               return !headNode ||
-                   !baseNode ||
-                   !fastDeepEqual(headNode.tags, baseNode.tags) ||
-                   !fastDeepEqual(headNode.loc, baseNode.loc);
-           }
-
-
-           function getSiblingAndChildVertices(ids, graph, wireframe, zoom) {
-               var results = {};
-
-               var seenIds = {};
-
-               function addChildVertices(entity) {
-
-                   // avoid redunant work and infinite recursion of circular relations
-                   if (seenIds[entity.id]) return;
-                   seenIds[entity.id] = true;
-
-                   var geometry = entity.geometry(graph);
-                   if (!context.features().isHiddenFeature(entity, graph, geometry)) {
-                       var i;
-                       if (entity.type === 'way') {
-                           for (i = 0; i < entity.nodes.length; i++) {
-                               var child = graph.hasEntity(entity.nodes[i]);
-                               if (child) {
-                                   addChildVertices(child);
-                               }
-                           }
-                       } else if (entity.type === 'relation') {
-                           for (i = 0; i < entity.members.length; i++) {
-                               var member = graph.hasEntity(entity.members[i].id);
-                               if (member) {
-                                   addChildVertices(member);
-                               }
-                           }
-                       } else if (renderAsVertex(entity, graph, wireframe, zoom)) {
-                           results[entity.id] = entity;
-                       }
-                   }
-               }
-
-               ids.forEach(function(id) {
-                   var entity = graph.hasEntity(id);
-                   if (!entity) return;
 
-                   if (entity.type === 'node') {
-                       if (renderAsVertex(entity, graph, wireframe, zoom)) {
-                           results[entity.id] = entity;
-                           graph.parentWays(entity).forEach(function(entity) {
-                               addChildVertices(entity);
-                           });
-                       }
-                   } else {  // way, relation
-                       addChildVertices(entity);
-                   }
-               });
+           var newTags = Object.assign({}, entity.tags); // shallow copy
 
-               return results;
+           if (preset.tags !== preset.addTags) {
+             Object.keys(preset.addTags).forEach(function (k) {
+               if (!newTags[k]) {
+                 if (preset.addTags[k] === '*') {
+                   newTags[k] = 'yes';
+                 } else {
+                   newTags[k] = preset.addTags[k];
+                 }
+               }
+             });
            }
 
+           if (_nsi) {
+             // Do `wikidata` or `wikipedia` identify this entity as a brand?  #6416
+             // If so, these tags can be swapped to `brand:wikidata`/`brand:wikipedia`
+             var isBrand;
+
+             if (newTags.wikidata) {
+               // try matching `wikidata`
+               isBrand = _nsi.wikidata[newTags.wikidata];
+             }
 
-           function drawVertices(selection, graph, entities, filter, extent, fullRedraw) {
-               var wireframe = context.surface().classed('fill-wireframe');
-               var visualDiff = context.surface().classed('highlight-edited');
-               var zoom = geoScaleToZoom(projection.scale());
-               var mode = context.mode();
-               var isMoving = mode && /^(add|draw|drag|move|rotate)/.test(mode.id);
-               var base = context.history().base();
-
-               var drawLayer = selection.selectAll('.layer-osm.points .points-group.vertices');
-               var touchLayer = selection.selectAll('.layer-touch.points');
-
-               if (fullRedraw) {
-                   _currPersistent = {};
-                   _radii = {};
-               }
-
-               // Collect important vertices from the `entities` list..
-               // (during a paritial redraw, it will not contain everything)
-               for (var i = 0; i < entities.length; i++) {
-                   var entity = entities[i];
-                   var geometry = entity.geometry(graph);
-                   var keep = false;
-
-                   // a point that looks like a vertex..
-                   if ((geometry === 'point') && renderAsVertex(entity, graph, wireframe, zoom)) {
-                       _currPersistent[entity.id] = entity;
-                       keep = true;
-
-                   // a vertex of some importance..
-                   } else if (geometry === 'vertex' &&
-                       (entity.hasInterestingTags() || entity.isEndpoint(graph) || entity.isConnected(graph)
-                       || (visualDiff && isEditedNode(entity, base, graph)))) {
-                       _currPersistent[entity.id] = entity;
-                       keep = true;
-                   }
+             if (!isBrand && newTags.wikipedia) {
+               // fallback to `wikipedia`
+               isBrand = _nsi.wikipedia[newTags.wikipedia];
+             }
 
-                   // whatever this is, it's not a persistent vertex..
-                   if (!keep && !fullRedraw) {
-                       delete _currPersistent[entity.id];
-                   }
+             if (isBrand && !newTags.office) {
+               // but avoid doing this for corporate offices
+               if (newTags.wikidata) {
+                 newTags['brand:wikidata'] = newTags.wikidata;
+                 delete newTags.wikidata;
                }
 
-               // 3 sets of vertices to consider:
-               var sets = {
-                   persistent: _currPersistent,  // persistent = important vertices (render always)
-                   selected: _currSelected,      // selected + siblings of selected (render always)
-                   hovered: _currHover           // hovered + siblings of hovered (render only in draw modes)
-               };
-
-               var all = Object.assign({}, (isMoving ? _currHover : {}), _currSelected, _currPersistent);
+               if (newTags.wikipedia) {
+                 newTags['brand:wikipedia'] = newTags.wikipedia;
+                 delete newTags.wikipedia;
+               } // I considered setting `name` and other tags here, but they aren't unique per wikidata
+               // (Q2759586 -> in USA "Papa John's", in Russia "Папа Джонс")
+               // So users will really need to use a preset or assign `name` themselves.
 
-               // Draw the vertices..
-               // The filter function controls the scope of what objects d3 will touch (exit/enter/update)
-               // Adjust the filter function to expand the scope beyond whatever entities were passed in.
-               var filterRendered = function(d) {
-                   return d.id in _currPersistent || d.id in _currSelected || d.id in _currHover || filter(d);
-               };
-               drawLayer
-                   .call(draw, graph, currentVisible(all), sets, filterRendered);
+             } // try key/value|name match against name-suggestion-index
 
-               // Draw touch targets..
-               // When drawing, render all targets (not just those affected by a partial redraw)
-               var filterTouch = function(d) {
-                   return isMoving ? true : filterRendered(d);
-               };
-               touchLayer
-                   .call(drawTargets, graph, currentVisible(all), filterTouch);
 
+             if (newTags.name) {
+               for (var i = 0; i < nsiKeys.length; i++) {
+                 var k = nsiKeys[i];
+                 if (!newTags[k]) continue;
+                 var center = entity.extent(graph).center();
+                 var countryCode = iso1A2Code(center);
 
-               function currentVisible(which) {
-                   return Object.keys(which)
-                       .map(graph.hasEntity, graph)     // the current version of this entity
-                       .filter(function (entity) { return entity && entity.intersects(extent, graph); });
-               }
-           }
+                 var match = _nsi.matcher.matchKVN(k, newTags[k], newTags.name, countryCode && countryCode.toLowerCase());
 
+                 if (!match) continue; // for now skip ambiguous matches (like Target~(USA) vs Target~(Australia))
 
-           // partial redraw - only update the selected items..
-           drawVertices.drawSelected = function(selection, graph, extent) {
-               var wireframe = context.surface().classed('fill-wireframe');
-               var zoom = geoScaleToZoom(projection.scale());
+                 if (match.d) continue;
+                 var brand = _nsi.brands[match.kvnd];
 
-               _prevSelected = _currSelected || {};
-               if (context.map().isInWideSelection()) {
-                   _currSelected = {};
-                   context.selectedIDs().forEach(function(id) {
-                       var entity = graph.hasEntity(id);
-                       if (!entity) return;
+                 if (brand && brand.tags['brand:wikidata'] && brand.tags['brand:wikidata'] !== entity.tags['not:brand:wikidata']) {
+                   subtype = 'noncanonical_brand';
+                   var keepTags = ['takeaway'].reduce(function (acc, k) {
+                     if (newTags[k]) {
+                       acc[k] = newTags[k];
+                     }
 
-                       if (entity.type === 'node') {
-                           if (renderAsVertex(entity, graph, wireframe, zoom)) {
-                               _currSelected[entity.id] = entity;
-                           }
-                       }
+                     return acc;
+                   }, {});
+                   nsiKeys.forEach(function (k) {
+                     return delete newTags[k];
                    });
-
-               } else {
-                   _currSelected = getSiblingAndChildVertices(context.selectedIDs(), graph, wireframe, zoom);
+                   Object.assign(newTags, brand.tags, keepTags);
+                   break;
+                 }
                }
+             }
+           } // determine diff
 
-               // note that drawVertices will add `_currSelected` automatically if needed..
-               var filter = function(d) { return d.id in _prevSelected; };
-               drawVertices(selection, graph, Object.values(_prevSelected), filter, extent, false);
-           };
-
-
-           // partial redraw - only update the hovered items..
-           drawVertices.drawHover = function(selection, graph, target, extent) {
-               if (target === _currHoverTarget) return;  // continue only if something changed
 
-               var wireframe = context.surface().classed('fill-wireframe');
-               var zoom = geoScaleToZoom(projection.scale());
+           var tagDiff = utilTagDiff(oldTags, newTags);
+           if (!tagDiff.length) return [];
+           var isOnlyAddingTags = tagDiff.every(function (d) {
+             return d.type === '+';
+           });
+           var prefix = '';
 
-               _prevHover = _currHover || {};
-               _currHoverTarget = target;
-               var entity = target && target.properties && target.properties.entity;
+           if (subtype === 'noncanonical_brand') {
+             prefix = 'noncanonical_brand.';
+           } else if (subtype === 'deprecated_tags' && isOnlyAddingTags) {
+             subtype = 'incomplete_tags';
+             prefix = 'incomplete.';
+           } // don't allow autofixing brand tags
 
-               if (entity) {
-                   _currHover = getSiblingAndChildVertices([entity.id], graph, wireframe, zoom);
-               } else {
-                   _currHover = {};
-               }
 
-               // note that drawVertices will add `_currHover` automatically if needed..
-               var filter = function(d) { return d.id in _prevHover; };
-               drawVertices(selection, graph, Object.values(_prevHover), filter, extent, false);
-           };
+           var autoArgs = subtype !== 'noncanonical_brand' ? [doUpgrade, _t('issues.fix.upgrade_tags.annotation')] : null;
+           return [new validationIssue({
+             type: type,
+             subtype: subtype,
+             severity: 'warning',
+             message: showMessage,
+             reference: showReference,
+             entityIds: [entity.id],
+             hash: JSON.stringify(tagDiff),
+             dynamicFixes: function dynamicFixes() {
+               return [new validationIssueFix({
+                 autoArgs: autoArgs,
+                 title: _t.html('issues.fix.upgrade_tags.title'),
+                 onClick: function onClick(context) {
+                   context.perform(doUpgrade, _t('issues.fix.upgrade_tags.annotation'));
+                 }
+               })];
+             }
+           })];
 
-           return drawVertices;
-       }
+           function doUpgrade(graph) {
+             var currEntity = graph.hasEntity(entity.id);
+             if (!currEntity) return graph;
+             var newTags = Object.assign({}, currEntity.tags); // shallow copy
 
-       function utilBindOnce(target, type, listener, capture) {
-           var typeOnce = type + '.once';
-           function one() {
-               target.on(typeOnce, null);
-               listener.apply(this, arguments);
+             tagDiff.forEach(function (diff) {
+               if (diff.type === '-') {
+                 delete newTags[diff.key];
+               } else if (diff.type === '+') {
+                 newTags[diff.key] = diff.newVal;
+               }
+             });
+             return actionChangeTags(currEntity.id, newTags)(graph);
            }
-           target.on(typeOnce, one, capture);
-           return this;
-       }
 
-       // Adapted from d3-zoom to handle pointer events.
+           function showMessage(context) {
+             var currEntity = context.hasEntity(entity.id);
+             if (!currEntity) return '';
+             var messageID = "issues.outdated_tags.".concat(prefix, "message");
 
-       // Ignore right-click, since that should open the context menu.
-       function defaultFilter$2() {
-         return !event.ctrlKey && !event.button;
-       }
+             if (subtype === 'noncanonical_brand' && isOnlyAddingTags) {
+               messageID += '_incomplete';
+             }
 
-       function defaultExtent$1() {
-         var e = this;
-         if (e instanceof SVGElement) {
-           e = e.ownerSVGElement || e;
-           if (e.hasAttribute('viewBox')) {
-             e = e.viewBox.baseVal;
-             return [[e.x, e.y], [e.x + e.width, e.y + e.height]];
+             return _t.html(messageID, {
+               feature: utilDisplayLabel(currEntity, context.graph())
+             });
            }
-           return [[0, 0], [e.width.baseVal.value, e.height.baseVal.value]];
-         }
-         return [[0, 0], [e.clientWidth, e.clientHeight]];
-       }
-
-       function defaultWheelDelta$1() {
-         return -event.deltaY * (event.deltaMode === 1 ? 0.05 : event.deltaMode ? 1 : 0.002);
-       }
-
-       function defaultConstrain$1(transform, extent, translateExtent) {
-         var dx0 = transform.invertX(extent[0][0]) - translateExtent[0][0],
-             dx1 = transform.invertX(extent[1][0]) - translateExtent[1][0],
-             dy0 = transform.invertY(extent[0][1]) - translateExtent[0][1],
-             dy1 = transform.invertY(extent[1][1]) - translateExtent[1][1];
-         return transform.translate(
-           dx1 > dx0 ? (dx0 + dx1) / 2 : Math.min(0, dx0) || Math.max(0, dx1),
-           dy1 > dy0 ? (dy0 + dy1) / 2 : Math.min(0, dy0) || Math.max(0, dy1)
-         );
-       }
-
-       function utilZoomPan() {
-         var filter = defaultFilter$2,
-             extent = defaultExtent$1,
-             constrain = defaultConstrain$1,
-             wheelDelta = defaultWheelDelta$1,
-             scaleExtent = [0, Infinity],
-             translateExtent = [[-Infinity, -Infinity], [Infinity, Infinity]],
-             interpolate = interpolateZoom,
-             listeners = dispatch('start', 'zoom', 'end'),
-             _wheelDelay = 150,
-             _transform = identity$2,
-             _activeGesture;
 
-         function zoom(selection) {
-           selection
-               .on('pointerdown.zoom', pointerdown)
-               .on('wheel.zoom', wheeled)
-               .style('touch-action', 'none')
-               .style('-webkit-tap-highlight-color', 'rgba(0,0,0,0)');
-
-           select(window)
-               .on('pointermove.zoompan', pointermove)
-               .on('pointerup.zoompan pointercancel.zoompan', pointerup);
-         }
-
-         zoom.transform = function(collection, transform, point) {
-           var selection = collection.selection ? collection.selection() : collection;
-           if (collection !== selection) {
-             schedule(collection, transform, point);
-           } else {
-             selection.interrupt().each(function() {
-               gesture(this, arguments)
-                   .start()
-                   .zoom(null, typeof transform === 'function' ? transform.apply(this, arguments) : transform)
-                   .end();
+           function showReference(selection) {
+             var enter = selection.selectAll('.issue-reference').data([0]).enter();
+             enter.append('div').attr('class', 'issue-reference').html(_t.html("issues.outdated_tags.".concat(prefix, "reference")));
+             enter.append('strong').html(_t.html('issues.suggested'));
+             enter.append('table').attr('class', 'tagDiff-table').selectAll('.tagDiff-row').data(tagDiff).enter().append('tr').attr('class', 'tagDiff-row').append('td').attr('class', function (d) {
+               var klass = d.type === '+' ? 'add' : 'remove';
+               return "tagDiff-cell tagDiff-cell-".concat(klass);
+             }).html(function (d) {
+               return d.display;
              });
            }
-         };
-
-         zoom.scaleBy = function(selection, k, p) {
-           zoom.scaleTo(selection, function() {
-             var k0 = _transform.k,
-                 k1 = typeof k === 'function' ? k.apply(this, arguments) : k;
-             return k0 * k1;
-           }, p);
-         };
-
-         zoom.scaleTo = function(selection, k, p) {
-           zoom.transform(selection, function() {
-             var e = extent.apply(this, arguments),
-                 t0 = _transform,
-                 p0 = p == null ? centroid(e) : typeof p === 'function' ? p.apply(this, arguments) : p,
-                 p1 = t0.invert(p0),
-                 k1 = typeof k === 'function' ? k.apply(this, arguments) : k;
-             return constrain(translate(scale(t0, k1), p0, p1), e, translateExtent);
-           }, p);
-         };
-
-         zoom.translateBy = function(selection, x, y) {
-           zoom.transform(selection, function() {
-             return constrain(_transform.translate(
-               typeof x === 'function' ? x.apply(this, arguments) : x,
-               typeof y === 'function' ? y.apply(this, arguments) : y
-             ), extent.apply(this, arguments), translateExtent);
-           });
-         };
-
-         zoom.translateTo = function(selection, x, y, p) {
-           zoom.transform(selection, function() {
-             var e = extent.apply(this, arguments),
-                 t = _transform,
-                 p0 = p == null ? centroid(e) : typeof p === 'function' ? p.apply(this, arguments) : p;
-             return constrain(identity$2.translate(p0[0], p0[1]).scale(t.k).translate(
-               typeof x === 'function' ? -x.apply(this, arguments) : -x,
-               typeof y === 'function' ? -y.apply(this, arguments) : -y
-             ), e, translateExtent);
-           }, p);
-         };
-
-         function scale(transform, k) {
-           k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], k));
-           return k === transform.k ? transform : new Transform(k, transform.x, transform.y);
-         }
-
-         function translate(transform, p0, p1) {
-           var x = p0[0] - p1[0] * transform.k, y = p0[1] - p1[1] * transform.k;
-           return x === transform.x && y === transform.y ? transform : new Transform(transform.k, x, y);
          }
 
-         function centroid(extent) {
-           return [(+extent[0][0] + +extent[1][0]) / 2, (+extent[0][1] + +extent[1][1]) / 2];
-         }
-
-         function schedule(transition, transform, point) {
-           transition
-               .on('start.zoom', function() { gesture(this, arguments).start(); })
-               .on('interrupt.zoom end.zoom', function() { gesture(this, arguments).end(); })
-               .tween('zoom', function() {
-                 var that = this,
-                     args = arguments,
-                     g = gesture(that, args),
-                     e = extent.apply(that, args),
-                     p = point == null ? centroid(e) : typeof point === 'function' ? point.apply(that, args) : point,
-                     w = Math.max(e[1][0] - e[0][0], e[1][1] - e[0][1]),
-                     a = _transform,
-                     b = typeof transform === 'function' ? transform.apply(that, args) : transform,
-                     i = interpolate(a.invert(p).concat(w / a.k), b.invert(p).concat(w / b.k));
-                 return function(t) {
-                   if (t === 1) t = b; // Avoid rounding error on end.
-                   else { var l = i(t), k = w / l[2]; t = new Transform(k, p[0] - l[0] * k, p[1] - l[1] * k); }
-                   g.zoom(null, t);
-                 };
-               });
-         }
-
-         function gesture(that, args, clean) {
-           return (!clean && _activeGesture) || new Gesture(that, args);
-         }
-
-         function Gesture(that, args) {
-           this.that = that;
-           this.args = args;
-           this.active = 0;
-           this.extent = extent.apply(that, args);
-         }
-
-         Gesture.prototype = {
-           start: function() {
-             if (++this.active === 1) {
-               _activeGesture = this;
-               this.emit('start');
-             }
-             return this;
-           },
-           zoom: function(key, transform) {
-             if (this.mouse && key !== 'mouse') this.mouse[1] = transform.invert(this.mouse[0]);
-             if (this.pointer0 && key !== 'touch') this.pointer0[1] = transform.invert(this.pointer0[0]);
-             if (this.pointer1 && key !== 'touch') this.pointer1[1] = transform.invert(this.pointer1[0]);
-             _transform = transform;
-             this.emit('zoom');
-             return this;
-           },
-           end: function() {
-             if (--this.active === 0) {
-               _activeGesture = null;
-               this.emit('end');
-             }
-             return this;
-           },
-           emit: function(type) {
-             customEvent(new ZoomEvent(zoom, type, _transform), listeners.apply, listeners, [type, this.that, this.args]);
-           }
-         };
-
-         function wheeled() {
-           if (!filter.apply(this, arguments)) return;
-           var g = gesture(this, arguments),
-               t = _transform,
-               k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], t.k * Math.pow(2, wheelDelta.apply(this, arguments)))),
-               p = utilFastMouse(this)(event);
-
-           // If the mouse is in the same location as before, reuse it.
-           // If there were recent wheel events, reset the wheel idle timeout.
-           if (g.wheel) {
-             if (g.mouse[0][0] !== p[0] || g.mouse[0][1] !== p[1]) {
-               g.mouse[1] = t.invert(g.mouse[0] = p);
-             }
-             clearTimeout(g.wheel);
+         function oldMultipolygonIssues(entity, graph) {
+           var multipolygon, outerWay;
 
-           // Otherwise, capture the mouse point and location at the start.
+           if (entity.type === 'relation') {
+             outerWay = osmOldMultipolygonOuterMemberOfRelation(entity, graph);
+             multipolygon = entity;
+           } else if (entity.type === 'way') {
+             multipolygon = osmIsOldMultipolygonOuterMember(entity, graph);
+             outerWay = entity;
            } else {
-             g.mouse = [p, t.invert(p)];
-             interrupt(this);
-             g.start();
+             return [];
            }
 
-           event.preventDefault();
-           event.stopImmediatePropagation();
-           g.wheel = setTimeout(wheelidled, _wheelDelay);
-           g.zoom('mouse', constrain(translate(scale(t, k), g.mouse[0], g.mouse[1]), g.extent, translateExtent));
+           if (!multipolygon || !outerWay) return [];
+           return [new validationIssue({
+             type: type,
+             subtype: 'old_multipolygon',
+             severity: 'warning',
+             message: showMessage,
+             reference: showReference,
+             entityIds: [outerWay.id, multipolygon.id],
+             dynamicFixes: function dynamicFixes() {
+               return [new validationIssueFix({
+                 autoArgs: [doUpgrade, _t('issues.fix.move_tags.annotation')],
+                 title: _t.html('issues.fix.move_tags.title'),
+                 onClick: function onClick(context) {
+                   context.perform(doUpgrade, _t('issues.fix.move_tags.annotation'));
+                 }
+               })];
+             }
+           })];
 
-           function wheelidled() {
-             g.wheel = null;
-             g.end();
+           function doUpgrade(graph) {
+             var currMultipolygon = graph.hasEntity(multipolygon.id);
+             var currOuterWay = graph.hasEntity(outerWay.id);
+             if (!currMultipolygon || !currOuterWay) return graph;
+             currMultipolygon = currMultipolygon.mergeTags(currOuterWay.tags);
+             graph = graph.replace(currMultipolygon);
+             return actionChangeTags(currOuterWay.id, {})(graph);
            }
-         }
-
-         var _downPointerIDs = new Set();
-         var _pointerLocGetter;
-
-         function pointerdown() {
-           _downPointerIDs.add(event.pointerId);
-
-           if (!filter.apply(this, arguments)) return;
-
-           var g = gesture(this, arguments, _downPointerIDs.size === 1);
-           var started;
 
-           event.stopImmediatePropagation();
-           _pointerLocGetter = utilFastMouse(this);
-           var loc = _pointerLocGetter(event);
-           var p = [loc, _transform.invert(loc), event.pointerId];
-           if (!g.pointer0) {
-              g.pointer0 = p;
-              started = true;
-
-           } else if (!g.pointer1 && g.pointer0[2] !== p[2]) {
-              g.pointer1 = p;
+           function showMessage(context) {
+             var currMultipolygon = context.hasEntity(multipolygon.id);
+             if (!currMultipolygon) return '';
+             return _t.html('issues.old_multipolygon.message', {
+               multipolygon: utilDisplayLabel(currMultipolygon, context.graph())
+             });
            }
 
-           if (started) {
-             interrupt(this);
-             g.start();
+           function showReference(selection) {
+             selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.old_multipolygon.reference'));
            }
          }
 
-         function pointermove() {
-           if (!_downPointerIDs.has(event.pointerId)) return;
+         var validation = function checkOutdatedTags(entity, graph) {
+           var issues = oldMultipolygonIssues(entity, graph);
+           if (!issues.length) issues = oldTagIssues(entity, graph);
+           return issues;
+         };
 
-           if (!_activeGesture || !_pointerLocGetter) return;
+         validation.type = type;
+         return validation;
+       }
 
-           var g = gesture(this, arguments);
+       function validationPrivateData() {
+         var type = 'private_data'; // assume that some buildings are private
+
+         var privateBuildingValues = {
+           detached: true,
+           farm: true,
+           house: true,
+           houseboat: true,
+           residential: true,
+           semidetached_house: true,
+           static_caravan: true
+         }; // but they might be public if they have one of these other tags
+
+         var publicKeys = {
+           amenity: true,
+           craft: true,
+           historic: true,
+           leisure: true,
+           office: true,
+           shop: true,
+           tourism: true
+         }; // these tags may contain personally identifying info
+
+         var personalTags = {
+           'contact:email': true,
+           'contact:fax': true,
+           'contact:phone': true,
+           email: true,
+           fax: true,
+           phone: true
+         };
+
+         var validation = function checkPrivateData(entity) {
+           var tags = entity.tags;
+           if (!tags.building || !privateBuildingValues[tags.building]) return [];
+           var keepTags = {};
 
-           var isPointer0 = g.pointer0 && g.pointer0[2] === event.pointerId;
-           var isPointer1 = !isPointer0 && g.pointer1 && g.pointer1[2] === event.pointerId;
+           for (var k in tags) {
+             if (publicKeys[k]) return []; // probably a public feature
 
-           if ((isPointer0 || isPointer1) && 'buttons' in event && !event.buttons) {
-             // The pointer went up without ending the gesture somehow, e.g.
-             // a down mouse was moved off the map and released. End it here.
-             if (g.pointer0) _downPointerIDs.delete(g.pointer0[2]);
-             if (g.pointer1) _downPointerIDs.delete(g.pointer1[2]);
-             g.end();
-             return;
+             if (!personalTags[k]) {
+               keepTags[k] = tags[k];
+             }
            }
 
-           event.preventDefault();
-           event.stopImmediatePropagation();
-
-           var loc = _pointerLocGetter(event);
-           var t, p, l;
+           var tagDiff = utilTagDiff(tags, keepTags);
+           if (!tagDiff.length) return [];
+           var fixID = tagDiff.length === 1 ? 'remove_tag' : 'remove_tags';
+           return [new validationIssue({
+             type: type,
+             severity: 'warning',
+             message: showMessage,
+             reference: showReference,
+             entityIds: [entity.id],
+             dynamicFixes: function dynamicFixes() {
+               return [new validationIssueFix({
+                 icon: 'iD-operation-delete',
+                 title: _t.html('issues.fix.' + fixID + '.title'),
+                 onClick: function onClick(context) {
+                   context.perform(doUpgrade, _t('issues.fix.upgrade_tags.annotation'));
+                 }
+               })];
+             }
+           })];
 
-           if (isPointer0) g.pointer0[0] = loc;
-           else if (isPointer1) g.pointer1[0] = loc;
+           function doUpgrade(graph) {
+             var currEntity = graph.hasEntity(entity.id);
+             if (!currEntity) return graph;
+             var newTags = Object.assign({}, currEntity.tags); // shallow copy
 
-           t = _transform;
-           if (g.pointer1) {
-             var p0 = g.pointer0[0], l0 = g.pointer0[1],
-                 p1 = g.pointer1[0], l1 = g.pointer1[1],
-                 dp = (dp = p1[0] - p0[0]) * dp + (dp = p1[1] - p0[1]) * dp,
-                 dl = (dl = l1[0] - l0[0]) * dl + (dl = l1[1] - l0[1]) * dl;
-             t = scale(t, Math.sqrt(dp / dl));
-             p = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2];
-             l = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2];
-           } else if (g.pointer0) {
-             p = g.pointer0[0];
-             l = g.pointer0[1];
+             tagDiff.forEach(function (diff) {
+               if (diff.type === '-') {
+                 delete newTags[diff.key];
+               } else if (diff.type === '+') {
+                 newTags[diff.key] = diff.newVal;
+               }
+             });
+             return actionChangeTags(currEntity.id, newTags)(graph);
            }
-           else return;
-           g.zoom('touch', constrain(translate(t, p, l), g.extent, translateExtent));
-         }
-
-         function pointerup() {
-           if (!_downPointerIDs.has(event.pointerId)) return;
-
-           _downPointerIDs.delete(event.pointerId);
-
-           if (!_activeGesture) return;
-
-           var g = gesture(this, arguments);
-
-           event.stopImmediatePropagation();
-
-           if (g.pointer0 && g.pointer0[2] === event.pointerId) delete g.pointer0;
-           else if (g.pointer1 && g.pointer1[2] === event.pointerId) delete g.pointer1;
 
-           if (g.pointer1 && !g.pointer0) {
-             g.pointer0 = g.pointer1;
-             delete g.pointer1;
-           }
-           if (g.pointer0) g.pointer0[1] = _transform.invert(g.pointer0[0]);
-           else {
-             g.end();
+           function showMessage(context) {
+             var currEntity = context.hasEntity(this.entityIds[0]);
+             if (!currEntity) return '';
+             return _t.html('issues.private_data.contact.message', {
+               feature: utilDisplayLabel(currEntity, context.graph())
+             });
            }
-         }
-
-         zoom.wheelDelta = function(_) {
-           return arguments.length ? (wheelDelta = utilFunctor(+_), zoom) : wheelDelta;
-         };
 
-         zoom.filter = function(_) {
-           return arguments.length ? (filter = utilFunctor(!!_), zoom) : filter;
+           function showReference(selection) {
+             var enter = selection.selectAll('.issue-reference').data([0]).enter();
+             enter.append('div').attr('class', 'issue-reference').html(_t.html('issues.private_data.reference'));
+             enter.append('strong').html(_t.html('issues.suggested'));
+             enter.append('table').attr('class', 'tagDiff-table').selectAll('.tagDiff-row').data(tagDiff).enter().append('tr').attr('class', 'tagDiff-row').append('td').attr('class', function (d) {
+               var klass = d.type === '+' ? 'add' : 'remove';
+               return 'tagDiff-cell tagDiff-cell-' + klass;
+             }).html(function (d) {
+               return d.display;
+             });
+           }
          };
 
-         zoom.extent = function(_) {
-           return arguments.length ? (extent = utilFunctor([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), zoom) : extent;
-         };
+         validation.type = type;
+         return validation;
+       }
 
-         zoom.scaleExtent = function(_) {
-           return arguments.length ? (scaleExtent[0] = +_[0], scaleExtent[1] = +_[1], zoom) : [scaleExtent[0], scaleExtent[1]];
-         };
+       var _discardNameRegexes = [];
+       function validationSuspiciousName() {
+         var type = 'suspicious_name';
+         var keysToTestForGenericValues = ['aerialway', 'aeroway', 'amenity', 'building', 'craft', 'highway', 'leisure', 'railway', 'man_made', 'office', 'shop', 'tourism', 'waterway']; // A concern here in switching to async data means that `_nsiFilters` will not
+         // be available at first, so the data on early tiles may not have tags validated fully.
 
-         zoom.translateExtent = function(_) {
-           return arguments.length ? (translateExtent[0][0] = +_[0][0], translateExtent[1][0] = +_[1][0], translateExtent[0][1] = +_[0][1], translateExtent[1][1] = +_[1][1], zoom) : [[translateExtent[0][0], translateExtent[0][1]], [translateExtent[1][0], translateExtent[1][1]]];
-         };
+         _mainFileFetcher.get('nsi_filters').then(function (filters) {
+           // known list of generic names (e.g. "bar")
+           _discardNameRegexes = filters.discardNames.map(function (discardName) {
+             return new RegExp(discardName, 'i');
+           });
+         })["catch"](function () {
+           /* ignore */
+         });
 
-         zoom.constrain = function(_) {
-           return arguments.length ? (constrain = _, zoom) : constrain;
-         };
+         function isDiscardedSuggestionName(lowercaseName) {
+           return _discardNameRegexes.some(function (regex) {
+             return regex.test(lowercaseName);
+           });
+         } // test if the name is just the key or tag value (e.g. "park")
 
-         zoom.interpolate = function(_) {
-           return arguments.length ? (interpolate = _, zoom) : interpolate;
-         };
 
-         zoom._transform = function(_) {
-           return arguments.length ? (_transform = _, zoom) : _transform;
-         };
+         function nameMatchesRawTag(lowercaseName, tags) {
+           for (var i = 0; i < keysToTestForGenericValues.length; i++) {
+             var key = keysToTestForGenericValues[i];
+             var val = tags[key];
 
-         zoom.on = function() {
-           var value = listeners.on.apply(listeners, arguments);
-           return value === listeners ? zoom : value;
-         };
+             if (val) {
+               val = val.toLowerCase();
 
-         return zoom;
-       }
+               if (key === lowercaseName || val === lowercaseName || key.replace(/\_/g, ' ') === lowercaseName || val.replace(/\_/g, ' ') === lowercaseName) {
+                 return true;
+               }
+             }
+           }
 
-       // A custom double-click / double-tap event detector that works on touch devices
-       // if pointer events are supported. Falls back to default `dblclick` event.
-       function utilDoubleUp() {
+           return false;
+         }
 
-           var dispatch$1 = dispatch('doubleUp');
+         function isGenericName(name, tags) {
+           name = name.toLowerCase();
+           return nameMatchesRawTag(name, tags) || isDiscardedSuggestionName(name);
+         }
 
-           var _maxTimespan = 500; // milliseconds
-           var _maxDistance = 20; // web pixels; be somewhat generous to account for touch devices
-           var _pointer; // object representing the pointer that could trigger double up
+         function makeGenericNameIssue(entityId, nameKey, genericName, langCode) {
+           return new validationIssue({
+             type: type,
+             subtype: 'generic_name',
+             severity: 'warning',
+             message: function message(context) {
+               var entity = context.hasEntity(this.entityIds[0]);
+               if (!entity) return '';
+               var preset = _mainPresetIndex.match(entity, context.graph());
+               var langName = langCode && _mainLocalizer.languageName(langCode);
+               return _t.html('issues.generic_name.message' + (langName ? '_language' : ''), {
+                 feature: preset.name(),
+                 name: genericName,
+                 language: langName
+               });
+             },
+             reference: showReference,
+             entityIds: [entityId],
+             hash: nameKey + '=' + genericName,
+             dynamicFixes: function dynamicFixes() {
+               return [new validationIssueFix({
+                 icon: 'iD-operation-delete',
+                 title: _t.html('issues.fix.remove_the_name.title'),
+                 onClick: function onClick(context) {
+                   var entityId = this.issue.entityIds[0];
+                   var entity = context.entity(entityId);
+                   var tags = Object.assign({}, entity.tags); // shallow copy
+
+                   delete tags[nameKey];
+                   context.perform(actionChangeTags(entityId, tags), _t('issues.fix.remove_generic_name.annotation'));
+                 }
+               })];
+             }
+           });
 
-           function pointerIsValidFor(loc) {
-               // second pointerup must occur within a small timeframe after the first pointerdown
-               return new Date().getTime() - _pointer.startTime <= _maxTimespan &&
-                   // all pointer events must occur within a small distance of the first pointerdown
-                   geoVecLength(_pointer.startLoc, loc) <= _maxDistance;
+           function showReference(selection) {
+             selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.generic_name.reference'));
            }
+         }
 
-           function pointerdown() {
-
-               // ignore right-click
-               if (event.ctrlKey || event.button === 2) return;
-
-               var loc = [event.clientX, event.clientY];
-
-               // Don't rely on pointerId here since it can change between pointerdown
-               // events on touch devices
-               if (_pointer && !pointerIsValidFor(loc)) {
-                   // if this pointer is no longer valid, clear it so another can be started
-                   _pointer = undefined;
-               }
+         function makeIncorrectNameIssue(entityId, nameKey, incorrectName, langCode) {
+           return new validationIssue({
+             type: type,
+             subtype: 'not_name',
+             severity: 'warning',
+             message: function message(context) {
+               var entity = context.hasEntity(this.entityIds[0]);
+               if (!entity) return '';
+               var preset = _mainPresetIndex.match(entity, context.graph());
+               var langName = langCode && _mainLocalizer.languageName(langCode);
+               return _t.html('issues.incorrect_name.message' + (langName ? '_language' : ''), {
+                 feature: preset.name(),
+                 name: incorrectName,
+                 language: langName
+               });
+             },
+             reference: showReference,
+             entityIds: [entityId],
+             hash: nameKey + '=' + incorrectName,
+             dynamicFixes: function dynamicFixes() {
+               return [new validationIssueFix({
+                 icon: 'iD-operation-delete',
+                 title: _t.html('issues.fix.remove_the_name.title'),
+                 onClick: function onClick(context) {
+                   var entityId = this.issue.entityIds[0];
+                   var entity = context.entity(entityId);
+                   var tags = Object.assign({}, entity.tags); // shallow copy
+
+                   delete tags[nameKey];
+                   context.perform(actionChangeTags(entityId, tags), _t('issues.fix.remove_mistaken_name.annotation'));
+                 }
+               })];
+             }
+           });
 
-               if (!_pointer) {
-                   _pointer = {
-                       startLoc: loc,
-                       startTime: new Date().getTime(),
-                       upCount: 0,
-                       pointerId: event.pointerId
-                   };
-               } else { // double down
-                   _pointer.pointerId = event.pointerId;
-               }
+           function showReference(selection) {
+             selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.generic_name.reference'));
            }
+         }
 
-           function pointerup() {
-
-               // ignore right-click
-               if (event.ctrlKey || event.button === 2) return;
+         var validation = function checkGenericName(entity) {
+           // a generic name is okay if it's a known brand or entity
+           if (entity.hasWikidata()) return [];
+           var issues = [];
+           var notNames = (entity.tags['not:name'] || '').split(';');
 
-               if (!_pointer || _pointer.pointerId !== event.pointerId) return;
+           for (var key in entity.tags) {
+             var m = key.match(/^name(?:(?::)([a-zA-Z_-]+))?$/);
+             if (!m) continue;
+             var langCode = m.length >= 2 ? m[1] : null;
+             var value = entity.tags[key];
 
-               _pointer.upCount += 1;
+             if (notNames.length) {
+               for (var i in notNames) {
+                 var notName = notNames[i];
 
-               if (_pointer.upCount === 2) { // double up!
-                   var loc = [event.clientX, event.clientY];
-                   if (pointerIsValidFor(loc)) {
-                       var locInThis = utilFastMouse(this)(event);
-                       dispatch$1.call('doubleUp', this, locInThis);
-                   }
-                   // clear the pointer info in any case
-                   _pointer = undefined;
+                 if (notName && value === notName) {
+                   issues.push(makeIncorrectNameIssue(entity.id, key, value, langCode));
+                   continue;
+                 }
                }
-           }
+             }
 
-           function doubleUp(selection) {
-               if ('PointerEvent' in window) {
-                   // dblclick isn't well supported on touch devices so manually use
-                   // pointer events if they're available
-                   selection
-                       .on('pointerdown.doubleUp', pointerdown)
-                       .on('pointerup.doubleUp', pointerup);
-               } else {
-                   // fallback to dblclick
-                   selection
-                       .on('dblclick.doubleUp', function() {
-                           dispatch$1.call('doubleUp', this, utilFastMouse(this)(event));
-                       });
-               }
+             if (isGenericName(value, entity.tags)) {
+               issues.push(makeGenericNameIssue(entity.id, key, value, langCode));
+             }
            }
 
-           doubleUp.off = function(selection) {
-               selection
-                   .on('pointerdown.doubleUp', null)
-                   .on('pointerup.doubleUp', null)
-                   .on('dblclick.doubleUp', null);
-           };
+           return issues;
+         };
 
-           return utilRebind(doubleUp, dispatch$1, 'on');
+         validation.type = type;
+         return validation;
        }
 
-       // constants
-       var TILESIZE = 256;
-       var minZoom = 2;
-       var maxZoom = 24;
-       var kMin = geoZoomToScale(minZoom, TILESIZE);
-       var kMax = geoZoomToScale(maxZoom, TILESIZE);
-
-       function clamp(num, min, max) {
-           return Math.max(min, Math.min(num, max));
-       }
+       function validationUnsquareWay(context) {
+         var type = 'unsquare_way';
+         var DEFAULT_DEG_THRESHOLD = 5; // see also issues.js
+         // use looser epsilon for detection to reduce warnings of buildings that are essentially square already
 
+         var epsilon = 0.05;
+         var nodeThreshold = 10;
 
-       function rendererMap(context) {
-           var dispatch$1 = dispatch(
-               'move', 'drawn',
-               'crossEditableZoom', 'hitMinZoom',
-               'changeHighlighting', 'changeAreaFill'
-           );
-           var projection = context.projection;
-           var curtainProjection = context.curtainProjection;
-           var drawLayers;
-           var drawPoints;
-           var drawVertices;
-           var drawLines;
-           var drawAreas;
-           var drawMidpoints;
-           var drawLabels;
-
-           var _selection = select(null);
-           var supersurface = select(null);
-           var wrapper = select(null);
-           var surface = select(null);
-
-           var _dimensions = [1, 1];
-           var _dblClickZoomEnabled = true;
-           var _redrawEnabled = true;
-           var _gestureTransformStart;
-           var _transformStart = projection.transform();
-           var _transformLast;
-           var _isTransformed = false;
-           var _minzoom = 0;
-           var _getMouseCoords;
-           var _lastPointerEvent;
-           var _lastWithinEditableZoom;
-
-           // whether a pointerdown event started the zoom
-           var _pointerDown = false;
-
-           // use pointer events on supported platforms; fallback to mouse events
-           var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
-
-           // use pointer event interaction if supported; fallback to touch/mouse events in d3-zoom
-           var _zoomerPannerFunction = 'PointerEvent' in window ? utilZoomPan : d3_zoom;
-
-           var _zoomerPanner = _zoomerPannerFunction()
-               .scaleExtent([kMin, kMax])
-               .interpolate(interpolate)
-               .filter(zoomEventFilter)
-               .on('zoom.map', zoomPan)
-               .on('start.map', function() {
-                   _pointerDown = event.sourceEvent && event.sourceEvent.type === 'pointerdown';
-               })
-               .on('end.map', function() {
-                   _pointerDown = false;
-               });
-           var _doubleUpHandler = utilDoubleUp();
-
-           var scheduleRedraw = throttle(redraw, 750);
-           // var isRedrawScheduled = false;
-           // var pendingRedrawCall;
-           // function scheduleRedraw() {
-           //     // Only schedule the redraw if one has not already been set.
-           //     if (isRedrawScheduled) return;
-           //     isRedrawScheduled = true;
-           //     var that = this;
-           //     var args = arguments;
-           //     pendingRedrawCall = window.requestIdleCallback(function () {
-           //         // Reset the boolean so future redraws can be set.
-           //         isRedrawScheduled = false;
-           //         redraw.apply(that, args);
-           //     }, { timeout: 1400 });
-           // }
+         function isBuilding(entity, graph) {
+           if (entity.type !== 'way' || entity.geometry(graph) !== 'area') return false;
+           return entity.tags.building && entity.tags.building !== 'no';
+         }
 
-           function cancelPendingRedraw() {
-               scheduleRedraw.cancel();
-               // isRedrawScheduled = false;
-               // window.cancelIdleCallback(pendingRedrawCall);
-           }
+         var validation = function checkUnsquareWay(entity, graph) {
+           if (!isBuilding(entity, graph)) return []; // don't flag ways marked as physically unsquare
 
+           if (entity.tags.nonsquare === 'yes') return [];
+           var isClosed = entity.isClosed();
+           if (!isClosed) return []; // this building has bigger problems
+           // don't flag ways with lots of nodes since they are likely detail-mapped
 
-           function map(selection) {
-               _selection = selection;
+           var nodes = graph.childNodes(entity).slice(); // shallow copy
 
-               context
-                   .on('change.map', immediateRedraw);
+           if (nodes.length > nodeThreshold + 1) return []; // +1 because closing node appears twice
+           // ignore if not all nodes are fully downloaded
 
-               var osm = context.connection();
-               if (osm) {
-                   osm.on('change.map', immediateRedraw);
-               }
+           var osm = services.osm;
+           if (!osm || nodes.some(function (node) {
+             return !osm.isDataLoaded(node.loc);
+           })) return []; // don't flag connected ways to avoid unresolvable unsquare loops
 
-               function didUndoOrRedo(targetTransform) {
-                   var mode = context.mode().id;
-                   if (mode !== 'browse' && mode !== 'select') return;
-                   if (targetTransform) {
-                       map.transformEase(targetTransform);
-                   }
-               }
+           var hasConnectedSquarableWays = nodes.some(function (node) {
+             return graph.parentWays(node).some(function (way) {
+               if (way.id === entity.id) return false;
+               if (isBuilding(way, graph)) return true;
+               return graph.parentRelations(way).some(function (parentRelation) {
+                 return parentRelation.isMultipolygon() && parentRelation.tags.building && parentRelation.tags.building !== 'no';
+               });
+             });
+           });
+           if (hasConnectedSquarableWays) return []; // user-configurable square threshold
 
-               context.history()
-                   .on('merge.map', function() { scheduleRedraw(); })
-                   .on('change.map', immediateRedraw)
-                   .on('undone.map', function(stack, fromStack) {
-                       didUndoOrRedo(fromStack.transform);
-                   })
-                   .on('redone.map', function(stack) {
-                       didUndoOrRedo(stack.transform);
-                   });
+           var storedDegreeThreshold = corePreferences('validate-square-degrees');
+           var degreeThreshold = isNaN(storedDegreeThreshold) ? DEFAULT_DEG_THRESHOLD : parseFloat(storedDegreeThreshold);
+           var points = nodes.map(function (node) {
+             return context.projection(node.loc);
+           });
+           if (!geoOrthoCanOrthogonalize(points, isClosed, epsilon, degreeThreshold, true)) return [];
+           var autoArgs; // don't allow autosquaring features linked to wikidata
 
-               context.background()
-                   .on('change.map', immediateRedraw);
+           if (!entity.tags.wikidata) {
+             // use same degree threshold as for detection
+             var autoAction = actionOrthogonalize(entity.id, context.projection, undefined, degreeThreshold);
+             autoAction.transitionable = false; // when autofixing, do it instantly
 
-               context.features()
-                   .on('redraw.map', immediateRedraw);
+             autoArgs = [autoAction, _t('operations.orthogonalize.annotation.feature', {
+               n: 1
+             })];
+           }
 
-               drawLayers
-                   .on('change.map', function() {
-                       context.background().updateImagery();
-                       immediateRedraw();
-                   });
+           return [new validationIssue({
+             type: type,
+             subtype: 'building',
+             severity: 'warning',
+             message: function message(context) {
+               var entity = context.hasEntity(this.entityIds[0]);
+               return entity ? _t.html('issues.unsquare_way.message', {
+                 feature: utilDisplayLabel(entity, context.graph())
+               }) : '';
+             },
+             reference: showReference,
+             entityIds: [entity.id],
+             hash: JSON.stringify(autoArgs !== undefined) + degreeThreshold,
+             dynamicFixes: function dynamicFixes() {
+               return [new validationIssueFix({
+                 icon: 'iD-operation-orthogonalize',
+                 title: _t.html('issues.fix.square_feature.title'),
+                 autoArgs: autoArgs,
+                 onClick: function onClick(context, completionHandler) {
+                   var entityId = this.issue.entityIds[0]; // use same degree threshold as for detection
+
+                   context.perform(actionOrthogonalize(entityId, context.projection, undefined, degreeThreshold), _t('operations.orthogonalize.annotation.feature', {
+                     n: 1
+                   })); // run after the squaring transition (currently 150ms)
+
+                   window.setTimeout(function () {
+                     completionHandler();
+                   }, 175);
+                 }
+               })
+               /*
+               new validationIssueFix({
+                   title: t.html('issues.fix.tag_as_unsquare.title'),
+                   onClick: function(context) {
+                       var entityId = this.issue.entityIds[0];
+                       var entity = context.entity(entityId);
+                       var tags = Object.assign({}, entity.tags);  // shallow copy
+                       tags.nonsquare = 'yes';
+                       context.perform(
+                           actionChangeTags(entityId, tags),
+                           t('issues.fix.tag_as_unsquare.annotation')
+                       );
+                   }
+               })
+               */
+               ];
+             }
+           })];
 
-               selection
-                   .on('wheel.map mousewheel.map', function() {
-                       // disable swipe-to-navigate browser pages on trackpad/magic mouse – #5552
-                       event.preventDefault();
-                   })
-                   .call(_zoomerPanner)
-                   .call(_zoomerPanner.transform, projection.transform())
-                   .on('dblclick.zoom', null); // override d3-zoom dblclick handling
-
-               map.supersurface = supersurface = selection.append('div')
-                   .attr('class', 'supersurface')
-                   .call(utilSetTransform, 0, 0);
-
-               // Need a wrapper div because Opera can't cope with an absolutely positioned
-               // SVG element: http://bl.ocks.org/jfirebaugh/6fbfbd922552bf776c16
-               wrapper = supersurface
-                   .append('div')
-                   .attr('class', 'layer layer-data');
-
-               map.surface = surface = wrapper
-                   .call(drawLayers)
-                   .selectAll('.surface');
-
-               surface
-                   .call(drawLabels.observe)
-                   .call(_doubleUpHandler)
-                   .on(_pointerPrefix + 'down.zoom', function() {
-                       _lastPointerEvent = event;
-                       if (event.button === 2) {
-                           event.stopPropagation();
-                       }
-                   }, true)
-                   .on(_pointerPrefix + 'up.zoom', function() {
-                       _lastPointerEvent = event;
-                       if (resetTransform()) {
-                           immediateRedraw();
-                       }
-                   })
-                   .on(_pointerPrefix + 'move.map', function() {
-                       _lastPointerEvent = event;
-                   })
-                   .on(_pointerPrefix + 'over.vertices', function() {
-                       if (map.editableDataEnabled() && !_isTransformed) {
-                           var hover = event.target.__data__;
-                           surface.call(drawVertices.drawHover, context.graph(), hover, map.extent());
-                           dispatch$1.call('drawn', this, { full: false });
-                       }
-                   })
-                   .on(_pointerPrefix + 'out.vertices', function() {
-                       if (map.editableDataEnabled() && !_isTransformed) {
-                           var hover = event.relatedTarget && event.relatedTarget.__data__;
-                           surface.call(drawVertices.drawHover, context.graph(), hover, map.extent());
-                           dispatch$1.call('drawn', this, { full: false });
-                       }
-                   });
+           function showReference(selection) {
+             selection.selectAll('.issue-reference').data([0]).enter().append('div').attr('class', 'issue-reference').html(_t.html('issues.unsquare_way.buildings.reference'));
+           }
+         };
 
-               var detected = utilDetect();
+         validation.type = type;
+         return validation;
+       }
 
-               // only WebKit supports gesture events
-               if ('GestureEvent' in window &&
-                   // Listening for gesture events on iOS 13.4+ breaks double-tapping,
-                   // but we only need to do this on desktop Safari anyway. – #7694
-                   !detected.isMobileWebKit) {
+       var Validations = /*#__PURE__*/Object.freeze({
+               __proto__: null,
+               validationAlmostJunction: validationAlmostJunction,
+               validationCloseNodes: validationCloseNodes,
+               validationCrossingWays: validationCrossingWays,
+               validationDisconnectedWay: validationDisconnectedWay,
+               validationFormatting: validationFormatting,
+               validationHelpRequest: validationHelpRequest,
+               validationImpossibleOneway: validationImpossibleOneway,
+               validationIncompatibleSource: validationIncompatibleSource,
+               validationMaprules: validationMaprules,
+               validationMismatchedGeometry: validationMismatchedGeometry,
+               validationMissingRole: validationMissingRole,
+               validationMissingTag: validationMissingTag,
+               validationOutdatedTags: validationOutdatedTags,
+               validationPrivateData: validationPrivateData,
+               validationSuspiciousName: validationSuspiciousName,
+               validationUnsquareWay: validationUnsquareWay
+       });
 
-                   // Desktop Safari sends gesture events for multitouch trackpad pinches.
-                   // We can listen for these and translate them into map zooms.
-                   surface
-                       .on('gesturestart.surface', function() {
-                           event.preventDefault();
-                           _gestureTransformStart = projection.transform();
-                       })
-                       .on('gesturechange.surface', gestureChange);
-               }
+       function coreValidator(context) {
+         var dispatch$1 = dispatch('validated', 'focusedIssue');
+         var validator = utilRebind({}, dispatch$1, 'on');
+         var _rules = {};
+         var _disabledRules = {};
+         var _ignoredIssueIDs = {}; // issue.id -> true
 
-               // must call after surface init
-               updateAreaFill();
+         var _baseCache = validationCache(); // issues before any user edits
 
-               _doubleUpHandler.on('doubleUp.map', function(p0) {
-                   if (!_dblClickZoomEnabled) return;
 
-                   // don't zoom if targeting something other than the map itself
-                   if (typeof event.target.__data__ === 'object' &&
-                       // or area fills
-                       !select(event.target).classed('fill')) return;
+         var _headCache = validationCache(); // issues after all user edits
 
-                   var zoomOut = event.shiftKey;
 
-                   var t = projection.transform();
+         var _validatedGraph = null;
 
-                   var p1 = t.invert(p0);
+         var _deferred = new Set(); //
+         // initialize the validator rulesets
+         //
 
-                   t = t.scale(zoomOut ? 0.5 : 2);
 
-                   t.x = p0[0] - p1[0] * t.k;
-                   t.y = p0[1] - p1[1] * t.k;
+         validator.init = function () {
+           Object.values(Validations).forEach(function (validation) {
+             if (typeof validation !== 'function') return;
+             var fn = validation(context);
+             var key = fn.type;
+             _rules[key] = fn;
+           });
+           var disabledRules = corePreferences('validate-disabledRules');
 
-                   map.transformEase(t);
-               });
+           if (disabledRules) {
+             disabledRules.split(',').forEach(function (key) {
+               _disabledRules[key] = true;
+             });
+           }
+         };
 
-               context.on('enter.map',  function() {
-                   if (!map.editableDataEnabled(true /* skip zoom check */)) return;
-
-                   // redraw immediately any objects affected by a change in selectedIDs.
-                   var graph = context.graph();
-                   var selectedAndParents = {};
-                   context.selectedIDs().forEach(function(id) {
-                       var entity = graph.hasEntity(id);
-                       if (entity) {
-                           selectedAndParents[entity.id] = entity;
-                           if (entity.type === 'node') {
-                               graph.parentWays(entity).forEach(function(parent) {
-                                   selectedAndParents[parent.id] = parent;
-                               });
-                           }
-                       }
-                   });
-                   var data = Object.values(selectedAndParents);
-                   var filter = function(d) { return d.id in selectedAndParents; };
+         function reset(resetIgnored) {
+           Array.from(_deferred).forEach(function (handle) {
+             window.cancelIdleCallback(handle);
 
-                   data = context.features().filter(data, graph);
+             _deferred["delete"](handle);
+           }); // clear caches
 
-                   surface
-                       .call(drawVertices.drawSelected, graph, map.extent())
-                       .call(drawLines, graph, data, filter)
-                       .call(drawAreas, graph, data, filter)
-                       .call(drawMidpoints, graph, data, filter, map.trimmedExtent());
+           if (resetIgnored) _ignoredIssueIDs = {};
+           _baseCache = validationCache();
+           _headCache = validationCache();
+           _validatedGraph = null;
+         } //
+         // clear caches, called whenever iD resets after a save
+         //
 
-                   dispatch$1.call('drawn', this, { full: false });
 
-                   // redraw everything else later
-                   scheduleRedraw();
-               });
+         validator.reset = function () {
+           reset(true);
+         };
 
-               map.dimensions(utilGetDimensions(selection));
-           }
+         validator.resetIgnoredIssues = function () {
+           _ignoredIssueIDs = {}; // reload UI
 
+           dispatch$1.call('validated');
+         }; // must update issues when the user changes the unsquare thereshold
 
-           function zoomEventFilter() {
-               // Fix for #2151, (see also d3/d3-zoom#60, d3/d3-brush#18)
-               // Intercept `mousedown` and check if there is an orphaned zoom gesture.
-               // This can happen if a previous `mousedown` occurred without a `mouseup`.
-               // If we detect this, dispatch `mouseup` to complete the orphaned gesture,
-               // so that d3-zoom won't stop propagation of new `mousedown` events.
-               if (event.type === 'mousedown') {
-                   var hasOrphan = false;
-                   var listeners = window.__on;
-                   for (var i = 0; i < listeners.length; i++) {
-                       var listener = listeners[i];
-                       if (listener.name === 'zoom' && listener.type === 'mouseup') {
-                           hasOrphan = true;
-                           break;
-                       }
-                   }
-                   if (hasOrphan) {
-                       var event$1 = window.CustomEvent;
-                       if (event$1) {
-                           event$1 = new event$1('mouseup');
-                       } else {
-                           event$1 = window.document.createEvent('Event');
-                           event$1.initEvent('mouseup', false, false);
-                       }
-                       // Event needs to be dispatched with an event.view property.
-                       event$1.view = window;
-                       window.dispatchEvent(event$1);
-                   }
-               }
 
-               return event.button !== 2;   // ignore right clicks
-           }
+         validator.reloadUnsquareIssues = function () {
+           reloadUnsquareIssues(_headCache, context.graph());
+           reloadUnsquareIssues(_baseCache, context.history().base());
+           dispatch$1.call('validated');
+         };
 
+         function reloadUnsquareIssues(cache, graph) {
+           var checkUnsquareWay = _rules.unsquare_way;
+           if (typeof checkUnsquareWay !== 'function') return; // uncache existing
 
-           function pxCenter() {
-               return [_dimensions[0] / 2, _dimensions[1] / 2];
-           }
+           cache.uncacheIssuesOfType('unsquare_way');
+           var buildings = context.history().tree().intersects(geoExtent([-180, -90], [180, 90]), graph) // everywhere
+           .filter(function (entity) {
+             return entity.type === 'way' && entity.tags.building && entity.tags.building !== 'no';
+           }); // rerun for all buildings
 
+           buildings.forEach(function (entity) {
+             var detected = checkUnsquareWay(entity, graph);
+             if (detected.length !== 1) return;
+             var issue = detected[0];
 
-           function drawEditable(difference, extent) {
-               var mode = context.mode();
-               var graph = context.graph();
-               var features = context.features();
-               var all = context.history().intersects(map.extent());
-               var fullRedraw = false;
-               var data;
-               var set;
-               var filter;
-               var applyFeatureLayerFilters = true;
-
-               if (map.isInWideSelection()) {
-                   data = [];
-                   utilEntityAndDeepMemberIDs(mode.selectedIDs(), context.graph()).forEach(function(id) {
-                       var entity = context.hasEntity(id);
-                       if (entity) data.push(entity);
-                   });
-                   fullRedraw = true;
-                   filter = utilFunctor(true);
-                   // selected features should always be visible, so we can skip filtering
-                   applyFeatureLayerFilters = false;
-
-               } else if (difference) {
-                   var complete = difference.complete(map.extent());
-                   data = Object.values(complete).filter(Boolean);
-                   set = new Set(Object.keys(complete));
-                   filter = function(d) { return set.has(d.id); };
-                   features.clear(data);
+             if (!cache.issuesByEntityID[entity.id]) {
+               cache.issuesByEntityID[entity.id] = new Set();
+             }
 
-               } else {
-                   // force a full redraw if gatherStats detects that a feature
-                   // should be auto-hidden (e.g. points or buildings)..
-                   if (features.gatherStats(all, graph, _dimensions)) {
-                       extent = undefined;
-                   }
+             cache.issuesByEntityID[entity.id].add(issue.id);
+             cache.issuesByIssueID[issue.id] = issue;
+           });
+         } // options = {
+         //     what: 'all',     // 'all' or 'edited'
+         //     where: 'all',   // 'all' or 'visible'
+         //     includeIgnored: false   // true, false, or 'only'
+         //     includeDisabledRules: false   // true, false, or 'only'
+         // };
+
+
+         validator.getIssues = function (options) {
+           var opts = Object.assign({
+             what: 'all',
+             where: 'all',
+             includeIgnored: false,
+             includeDisabledRules: false
+           }, options);
+           var issues = Object.values(_headCache.issuesByIssueID);
+           var view = context.map().extent();
+           return issues.filter(function (issue) {
+             if (!issue) return false;
+             if (opts.includeDisabledRules === 'only' && !_disabledRules[issue.type]) return false;
+             if (!opts.includeDisabledRules && _disabledRules[issue.type]) return false;
+             if (opts.includeIgnored === 'only' && !_ignoredIssueIDs[issue.id]) return false;
+             if (!opts.includeIgnored && _ignoredIssueIDs[issue.id]) return false; // Sanity check:  This issue may be for an entity that not longer exists.
+             // If we detect this, uncache and return false so it is not included..
 
-                   if (extent) {
-                       data = context.history().intersects(map.extent().intersection(extent));
-                       set = new Set(data.map(function(entity) { return entity.id; }));
-                       filter = function(d) { return set.has(d.id); };
+             var entityIds = issue.entityIds || [];
 
-                   } else {
-                       data = all;
-                       fullRedraw = true;
-                       filter = utilFunctor(true);
-                   }
-               }
+             for (var i = 0; i < entityIds.length; i++) {
+               var entityId = entityIds[i];
 
-               if (applyFeatureLayerFilters) {
-                   data = features.filter(data, graph);
-               } else {
-                   context.features().resetStats();
+               if (!context.hasEntity(entityId)) {
+                 delete _headCache.issuesByEntityID[entityId];
+                 delete _headCache.issuesByIssueID[issue.id];
+                 return false;
                }
+             }
 
-               if (mode && mode.id === 'select') {
-                   // update selected vertices - the user might have just double-clicked a way,
-                   // creating a new vertex, triggering a partial redraw without a mode change
-                   surface.call(drawVertices.drawSelected, graph, map.extent());
-               }
+             if (opts.what === 'edited' && _baseCache.issuesByIssueID[issue.id]) return false;
 
-               surface
-                   .call(drawVertices, graph, data, filter, map.extent(), fullRedraw)
-                   .call(drawLines, graph, data, filter)
-                   .call(drawAreas, graph, data, filter)
-                   .call(drawMidpoints, graph, data, filter, map.trimmedExtent())
-                   .call(drawLabels, graph, data, filter, _dimensions, fullRedraw)
-                   .call(drawPoints, graph, data, filter);
+             if (opts.where === 'visible') {
+               var extent = issue.extent(context.graph());
+               if (!view.intersects(extent)) return false;
+             }
 
-               dispatch$1.call('drawn', this, {full: true});
-           }
+             return true;
+           });
+         };
 
-           map.init = function() {
-               drawLayers = svgLayers(projection, context);
-               drawPoints = svgPoints(projection, context);
-               drawVertices = svgVertices(projection, context);
-               drawLines = svgLines(projection, context);
-               drawAreas = svgAreas(projection, context);
-               drawMidpoints = svgMidpoints(projection, context);
-               drawLabels = svgLabels(projection, context);
-           };
+         validator.getResolvedIssues = function () {
+           var baseIssues = Object.values(_baseCache.issuesByIssueID);
+           return baseIssues.filter(function (issue) {
+             return !_headCache.issuesByIssueID[issue.id];
+           });
+         };
 
-           function editOff() {
-               context.features().resetStats();
-               surface.selectAll('.layer-osm *').remove();
-               surface.selectAll('.layer-touch:not(.markers) *').remove();
-
-               var allowed = {
-                   'browse': true,
-                   'save': true,
-                   'select-note': true,
-                   'select-data': true,
-                   'select-error': true
-               };
+         validator.focusIssue = function (issue) {
+           var extent = issue.extent(context.graph());
 
-               var mode = context.mode();
-               if (mode && !allowed[mode.id]) {
-                   context.enter(modeBrowse(context));
-               }
+           if (extent) {
+             var setZoom = Math.max(context.map().zoom(), 19);
+             context.map().unobscuredCenterZoomEase(extent.center(), setZoom); // select the first entity
 
-               dispatch$1.call('drawn', this, {full: true});
+             if (issue.entityIds && issue.entityIds.length) {
+               window.setTimeout(function () {
+                 var ids = issue.entityIds;
+                 context.enter(modeSelect(context, [ids[0]]));
+                 dispatch$1.call('focusedIssue', this, issue);
+               }, 250); // after ease
+             }
            }
+         };
 
+         validator.getIssuesBySeverity = function (options) {
+           var groups = utilArrayGroupBy(validator.getIssues(options), 'severity');
+           groups.error = groups.error || [];
+           groups.warning = groups.warning || [];
+           return groups;
+         }; // show some issue types in a particular order
 
 
+         var orderedIssueTypes = [// flag missing data first
+         'missing_tag', 'missing_role', // then flag identity issues
+         'outdated_tags', 'mismatched_geometry', // flag geometry issues where fixing them might solve connectivity issues
+         'crossing_ways', 'almost_junction', // then flag connectivity issues
+         'disconnected_way', 'impossible_oneway']; // returns the issues that the given entity IDs have in common, matching the given options
 
+         validator.getSharedEntityIssues = function (entityIDs, options) {
+           var cache = _headCache; // gather the issues that are common to all the entities
 
-           function gestureChange() {
-               // Remap Safari gesture events to wheel events - #5492
-               // We want these disabled most places, but enabled for zoom/unzoom on map surface
-               // https://developer.mozilla.org/en-US/docs/Web/API/GestureEvent
-               var e = event;
-               e.preventDefault();
+           var issueIDs = entityIDs.reduce(function (acc, entityID) {
+             var entityIssueIDs = cache.issuesByEntityID[entityID] || new Set();
 
-               var props = {
-                   deltaMode: 0,    // dummy values to ignore in zoomPan
-                   deltaY: 1,       // dummy values to ignore in zoomPan
-                   clientX: e.clientX,
-                   clientY: e.clientY,
-                   screenX: e.screenX,
-                   screenY: e.screenY,
-                   x: e.x,
-                   y: e.y
-               };
+             if (!acc) {
+               return new Set(entityIssueIDs);
+             }
 
-               var e2 = new WheelEvent('wheel', props);
-               e2._scale = e.scale;         // preserve the original scale
-               e2._rotation = e.rotation;   // preserve the original rotation
-
-               _selection.node().dispatchEvent(e2);
-           }
-
-
-           function zoomPan(manualEvent) {
-               var event$1 = (manualEvent || event);
-               var source = event$1.sourceEvent;
-               var eventTransform = event$1.transform;
-               var x = eventTransform.x;
-               var y = eventTransform.y;
-               var k = eventTransform.k;
-
-               // Special handling of 'wheel' events:
-               // They might be triggered by the user scrolling the mouse wheel,
-               // or 2-finger pinch/zoom gestures, the transform may need adjustment.
-               if (source && source.type === 'wheel') {
-
-                   // assume that the gesture is already handled by pointer events
-                   if (_pointerDown) return;
-
-                   var detected = utilDetect();
-                   var dX = source.deltaX;
-                   var dY = source.deltaY;
-                   var x2 = x;
-                   var y2 = y;
-                   var k2 = k;
-                   var t0, p0, p1;
-
-                   // Normalize mousewheel scroll speed (Firefox) - #3029
-                   // If wheel delta is provided in LINE units, recalculate it in PIXEL units
-                   // We are essentially redoing the calculations that occur here:
-                   //   https://github.com/d3/d3-zoom/blob/78563a8348aa4133b07cac92e2595c2227ca7cd7/src/zoom.js#L203
-                   // See this for more info:
-                   //   https://github.com/basilfx/normalize-wheel/blob/master/src/normalizeWheel.js
-                   if (source.deltaMode === 1 /* LINE */) {
-                       // Convert from lines to pixels, more if the user is scrolling fast.
-                       // (I made up the exp function to roughly match Firefox to what Chrome does)
-                       // These numbers should be floats, because integers are treated as pan gesture below.
-                       var lines = Math.abs(source.deltaY);
-                       var sign = (source.deltaY > 0) ? 1 : -1;
-                       dY = sign * clamp(
-                           Math.exp((lines - 1) * 0.75) * 4.000244140625,
-                           4.000244140625,    // min
-                           350.000244140625   // max
-                       );
+             return new Set(_toConsumableArray(acc).filter(function (elem) {
+               return entityIssueIDs.has(elem);
+             }));
+           }, null) || [];
+           var opts = options || {};
+           return Array.from(issueIDs).map(function (id) {
+             return cache.issuesByIssueID[id];
+           }).filter(function (issue) {
+             if (!issue) return false;
+             if (opts.includeDisabledRules === 'only' && !_disabledRules[issue.type]) return false;
+             if (!opts.includeDisabledRules && _disabledRules[issue.type]) return false;
+             if (opts.includeIgnored === 'only' && !_ignoredIssueIDs[issue.id]) return false;
+             if (!opts.includeIgnored && _ignoredIssueIDs[issue.id]) return false;
+             return true;
+           }).sort(function (issue1, issue2) {
+             if (issue1.type === issue2.type) {
+               // issues of the same type, sort deterministically
+               return issue1.id < issue2.id ? -1 : 1;
+             }
 
-                       // On Firefox Windows and Linux we always get +/- the scroll line amount (default 3)
-                       // There doesn't seem to be any scroll accelleration.
-                       // This multiplier increases the speed a little bit - #5512
-                       if (detected.os !== 'mac') {
-                           dY *= 5;
-                       }
+             var index1 = orderedIssueTypes.indexOf(issue1.type);
+             var index2 = orderedIssueTypes.indexOf(issue2.type);
 
-                       // recalculate x2,y2,k2
-                       t0 = _isTransformed ? _transformLast : _transformStart;
-                       p0 = _getMouseCoords(source);
-                       p1 = t0.invert(p0);
-                       k2 = t0.k * Math.pow(2, -dY / 500);
-                       k2 = clamp(k2, kMin, kMax);
-                       x2 = p0[0] - p1[0] * k2;
-                       y2 = p0[1] - p1[1] * k2;
-
-                   // 2 finger map pinch zooming (Safari) - #5492
-                   // These are fake `wheel` events we made from Safari `gesturechange` events..
-                   } else if (source._scale) {
-                       // recalculate x2,y2,k2
-                       t0 = _gestureTransformStart;
-                       p0 = _getMouseCoords(source);
-                       p1 = t0.invert(p0);
-                       k2 = t0.k * source._scale;
-                       k2 = clamp(k2, kMin, kMax);
-                       x2 = p0[0] - p1[0] * k2;
-                       y2 = p0[1] - p1[1] * k2;
-
-                   // 2 finger map pinch zooming (all browsers except Safari) - #5492
-                   // Pinch zooming via the `wheel` event will always have:
-                   // - `ctrlKey = true`
-                   // - `deltaY` is not round integer pixels (ignore `deltaX`)
-                   } else if (source.ctrlKey && !isInteger(dY)) {
-                       dY *= 6;   // slightly scale up whatever the browser gave us
-
-                       // recalculate x2,y2,k2
-                       t0 = _isTransformed ? _transformLast : _transformStart;
-                       p0 = _getMouseCoords(source);
-                       p1 = t0.invert(p0);
-                       k2 = t0.k * Math.pow(2, -dY / 500);
-                       k2 = clamp(k2, kMin, kMax);
-                       x2 = p0[0] - p1[0] * k2;
-                       y2 = p0[1] - p1[1] * k2;
-
-                   // Trackpad scroll zooming with shift or alt/option key down
-                   } else if ((source.altKey || source.shiftKey) && isInteger(dY)) {
-                       // recalculate x2,y2,k2
-                       t0 = _isTransformed ? _transformLast : _transformStart;
-                       p0 = _getMouseCoords(source);
-                       p1 = t0.invert(p0);
-                       k2 = t0.k * Math.pow(2, -dY / 500);
-                       k2 = clamp(k2, kMin, kMax);
-                       x2 = p0[0] - p1[0] * k2;
-                       y2 = p0[1] - p1[1] * k2;
-
-                   // 2 finger map panning (Mac only, all browsers) - #5492, #5512
-                   // Panning via the `wheel` event will always have:
-                   // - `ctrlKey = false`
-                   // - `deltaX`,`deltaY` are round integer pixels
-                   } else if (detected.os === 'mac' && !source.ctrlKey && isInteger(dX) && isInteger(dY)) {
-                       p1 = projection.translate();
-                       x2 = p1[0] - dX;
-                       y2 = p1[1] - dY;
-                       k2 = projection.scale();
-                       k2 = clamp(k2, kMin, kMax);
-                   }
+             if (index1 !== -1 && index2 !== -1) {
+               // both issue types have explicit sort orders
+               return index1 - index2;
+             } else if (index1 === -1 && index2 === -1) {
+               // neither issue type has an explicit sort order, sort by type
+               return issue1.type < issue2.type ? -1 : 1;
+             } else {
+               // order explicit types before everything else
+               return index1 !== -1 ? -1 : 1;
+             }
+           });
+         };
 
-                   // something changed - replace the event transform
-                   if (x2 !== x || y2 !== y || k2 !== k) {
-                       x = x2;
-                       y = y2;
-                       k = k2;
-                       eventTransform = identity$2.translate(x2, y2).scale(k2);
-                       if (_zoomerPanner._transform) {
-                           // utilZoomPan interface
-                           _zoomerPanner._transform(eventTransform);
-                       } else {
-                           // d3_zoom interface
-                           _selection.node().__zoom = eventTransform;
-                       }
-                   }
+         validator.getEntityIssues = function (entityID, options) {
+           return validator.getSharedEntityIssues([entityID], options);
+         };
 
-               }
+         validator.getRuleKeys = function () {
+           return Object.keys(_rules);
+         };
 
-               if (_transformStart.x === x &&
-                   _transformStart.y === y &&
-                   _transformStart.k === k) {
-                   return;  // no change
-               }
+         validator.isRuleEnabled = function (key) {
+           return !_disabledRules[key];
+         };
 
-               var withinEditableZoom = map.withinEditableZoom();
-               if (_lastWithinEditableZoom !== withinEditableZoom) {
-                   if (_lastWithinEditableZoom !== undefined) {
-                       // notify that the map zoomed in or out over the editable zoom threshold
-                       dispatch$1.call('crossEditableZoom', this, withinEditableZoom);
-                   }
-                   _lastWithinEditableZoom = withinEditableZoom;
-               }
+         validator.toggleRule = function (key) {
+           if (_disabledRules[key]) {
+             delete _disabledRules[key];
+           } else {
+             _disabledRules[key] = true;
+           }
 
-               if (geoScaleToZoom(k, TILESIZE) < _minzoom) {
-                   surface.interrupt();
-                   dispatch$1.call('hitMinZoom', this, map);
-                   setCenterZoom(map.center(), context.minEditableZoom(), 0, true);
-                   scheduleRedraw();
-                   dispatch$1.call('move', this, map);
-                   return;
-               }
+           corePreferences('validate-disabledRules', Object.keys(_disabledRules).join(','));
+           validator.validate();
+         };
 
-               projection.transform(eventTransform);
+         validator.disableRules = function (keys) {
+           _disabledRules = {};
+           keys.forEach(function (k) {
+             _disabledRules[k] = true;
+           });
+           corePreferences('validate-disabledRules', Object.keys(_disabledRules).join(','));
+           validator.validate();
+         };
 
-               var scale = k / _transformStart.k;
-               var tX = (x / scale - _transformStart.x) * scale;
-               var tY = (y / scale - _transformStart.y) * scale;
+         validator.ignoreIssue = function (id) {
+           _ignoredIssueIDs[id] = true;
+         }; //
+         // Run validation on a single entity for the given graph
+         //
 
-               if (context.inIntro()) {
-                   curtainProjection.transform({
-                       x: x - tX,
-                       y: y - tY,
-                       k: k
-                   });
-               }
 
-               if (source) {
-                   _lastPointerEvent = event$1;
-               }
-               _isTransformed = true;
-               _transformLast = eventTransform;
-               utilSetTransform(supersurface, tX, tY, scale);
-               scheduleRedraw();
+         function validateEntity(entity, graph) {
+           var entityIssues = []; // runs validation and appends resulting issues
 
-               dispatch$1.call('move', this, map);
+           function runValidation(key) {
+             var fn = _rules[key];
 
+             if (typeof fn !== 'function') {
+               console.error('no such validation rule = ' + key); // eslint-disable-line no-console
 
-               function isInteger(val) {
-                   return typeof val === 'number' && isFinite(val) && Math.floor(val) === val;
-               }
-           }
+               return;
+             }
 
+             var detected = fn(entity, graph);
+             entityIssues = entityIssues.concat(detected);
+           } // run all rules
 
-           function resetTransform() {
-               if (!_isTransformed) return false;
 
-               utilSetTransform(supersurface, 0, 0);
-               _isTransformed = false;
-               if (context.inIntro()) {
-                   curtainProjection.transform(projection.transform());
-               }
-               return true;
-           }
+           Object.keys(_rules).forEach(runValidation);
+           return entityIssues;
+         }
 
+         function entityIDsToValidate(entityIDs, graph) {
+           var processedIDs = new Set();
+           return entityIDs.reduce(function (acc, entityID) {
+             // keep redundancy check separate from `acc` because an `entityID`
+             // could have been added to `acc` as a related entity through an earlier pass
+             if (processedIDs.has(entityID)) return acc;
+             processedIDs.add(entityID);
+             var entity = graph.hasEntity(entityID);
+             if (!entity) return acc;
+             acc.add(entityID);
+             var checkParentRels = [entity];
 
-           function redraw(difference, extent) {
-               if (surface.empty() || !_redrawEnabled) return;
+             if (entity.type === 'node') {
+               graph.parentWays(entity).forEach(function (parentWay) {
+                 acc.add(parentWay.id); // include parent ways
 
-               // If we are in the middle of a zoom/pan, we can't do differenced redraws.
-               // It would result in artifacts where differenced entities are redrawn with
-               // one transform and unchanged entities with another.
-               if (resetTransform()) {
-                   difference = extent = undefined;
-               }
+                 checkParentRels.push(parentWay);
+               });
+             } else if (entity.type === 'relation') {
+               entity.members.forEach(function (member) {
+                 acc.add(member.id); // include members
+               });
+             } else if (entity.type === 'way') {
+               entity.nodes.forEach(function (nodeID) {
+                 acc.add(nodeID); // include child nodes
 
-               var zoom = map.zoom();
-               var z = String(~~zoom);
+                 graph._parentWays[nodeID].forEach(function (wayID) {
+                   acc.add(wayID); // include connected ways
+                 });
+               });
+             }
 
-               if (surface.attr('data-zoom') !== z) {
-                   surface.attr('data-zoom', z);
+             checkParentRels.forEach(function (entity) {
+               // include parent relations
+               if (entity.type !== 'relation') {
+                 // but not super-relations
+                 graph.parentRelations(entity).forEach(function (parentRelation) {
+                   acc.add(parentRelation.id);
+                 });
                }
+             });
+             return acc;
+           }, new Set());
+         } //
+         // Run validation for several entities, supplied `entityIDs`,
+         // against `graph` for the given `cache`
+         //
 
-               // class surface as `lowzoom` around z17-z18.5 (based on latitude)
-               var lat = map.center()[1];
-               var lowzoom = linear$2()
-                   .domain([-60, 0, 60])
-                   .range([17, 18.5, 17])
-                   .clamp(true);
 
-               surface
-                   .classed('low-zoom', zoom <= lowzoom(lat));
+         function validateEntities(entityIDs, graph, cache) {
+           // clear caches for existing issues related to these entities
+           entityIDs.forEach(cache.uncacheEntityID); // detect new issues and update caches
 
+           entityIDs.forEach(function (entityID) {
+             var entity = graph.hasEntity(entityID); // don't validate deleted entities
 
-               if (!difference) {
-                   supersurface.call(context.background());
-                   wrapper.call(drawLayers);
-               }
+             if (!entity) return;
+             var issues = validateEntity(entity, graph);
+             cache.cacheIssues(issues);
+           });
+         } //
+         // Validates anything that has changed since the last time it was run.
+         // Also updates the "validatedGraph" to be the current graph
+         // and dispatches a `validated` event when finished.
+         //
 
-               // OSM
-               if (map.editableDataEnabled() || map.isInWideSelection()) {
-                   context.loadTiles(projection);
-                   drawEditable(difference, extent);
-               } else {
-                   editOff();
-               }
 
-               _transformStart = projection.transform();
+         validator.validate = function () {
+           var currGraph = context.graph();
+           _validatedGraph = _validatedGraph || context.history().base();
 
-               return map;
+           if (currGraph === _validatedGraph) {
+             dispatch$1.call('validated');
+             return;
            }
 
+           var oldGraph = _validatedGraph;
+           var difference = coreDifference(oldGraph, currGraph);
+           _validatedGraph = currGraph;
+           var createdAndModifiedEntityIDs = difference.extantIDs(true); // created/modified (true = w/relation members)
 
+           var entityIDsToCheck = entityIDsToValidate(createdAndModifiedEntityIDs, currGraph); // check modified and deleted entities against the old graph in order to update their related entities
+           // (e.g. deleting the only highway connected to a road should create a disconnected highway issue)
 
-           var immediateRedraw = function(difference, extent) {
-               if (!difference && !extent) cancelPendingRedraw();
-               redraw(difference, extent);
-           };
-
+           var modifiedAndDeletedEntityIDs = difference.deleted().concat(difference.modified()).map(function (entity) {
+             return entity.id;
+           });
+           var entityIDsToCheckForOldGraph = entityIDsToValidate(modifiedAndDeletedEntityIDs, oldGraph); // concat the sets
 
-           map.lastPointerEvent = function() {
-               return _lastPointerEvent;
-           };
+           entityIDsToCheckForOldGraph.forEach(entityIDsToCheck.add, entityIDsToCheck);
+           validateEntities(entityIDsToCheck, context.graph(), _headCache);
+           dispatch$1.call('validated');
+         };
 
+         context.history().on('reset.validator', function () {
+           // cached issues aren't valid any longer if the history has been reset
+           reset(false);
+           validator.validate();
+         }); // WHEN TO RUN VALIDATION:
+         // When graph changes:
 
-           map.mouse = function() {
-               var event$1 = _lastPointerEvent || event;
-               if (event$1) {
-                   var s;
-                   while ((s = event$1.sourceEvent)) { event$1 = s; }
-                   return _getMouseCoords(event$1);
-               }
-               return null;
-           };
+         context.history().on('restore.validator', validator.validate) // restore saved history
+         .on('undone.validator', validator.validate) // undo
+         .on('redone.validator', validator.validate); // redo
+         // but not on 'change' (e.g. while drawing)
+         // When user changes editing modes:
 
+         context.on('exit.validator', validator.validate); // When merging fetched data:
 
-           // returns Lng/Lat
-           map.mouseCoordinates = function() {
-               var coord = map.mouse() || pxCenter();
-               return projection.invert(coord);
-           };
+         context.history().on('merge.validator', function (entities) {
+           if (!entities) return;
+           var handle = window.requestIdleCallback(function () {
+             var entityIDs = entities.map(function (entity) {
+               return entity.id;
+             });
+             var headGraph = context.graph();
+             validateEntities(entityIDsToValidate(entityIDs, headGraph), headGraph, _headCache);
+             var baseGraph = context.history().base();
+             validateEntities(entityIDsToValidate(entityIDs, baseGraph), baseGraph, _baseCache);
+             dispatch$1.call('validated');
+           });
 
+           _deferred.add(handle);
+         });
+         return validator;
+       }
 
-           map.dblclickZoomEnable = function(val) {
-               if (!arguments.length) return _dblClickZoomEnabled;
-               _dblClickZoomEnabled = val;
-               return map;
-           };
+       function validationCache() {
+         var cache = {
+           issuesByIssueID: {},
+           // issue.id -> issue
+           issuesByEntityID: {} // entity.id -> set(issue.id)
 
+         };
 
-           map.redrawEnable = function(val) {
-               if (!arguments.length) return _redrawEnabled;
-               _redrawEnabled = val;
-               return map;
-           };
+         cache.cacheIssues = function (issues) {
+           issues.forEach(function (issue) {
+             var entityIds = issue.entityIds || [];
+             entityIds.forEach(function (entityId) {
+               if (!cache.issuesByEntityID[entityId]) {
+                 cache.issuesByEntityID[entityId] = new Set();
+               }
 
+               cache.issuesByEntityID[entityId].add(issue.id);
+             });
+             cache.issuesByIssueID[issue.id] = issue;
+           });
+         };
 
-           map.isTransformed = function() {
-               return _isTransformed;
-           };
+         cache.uncacheIssue = function (issue) {
+           // When multiple entities are involved (e.g. crossing_ways),
+           // remove this issue from the other entity caches too..
+           var entityIds = issue.entityIds || [];
+           entityIds.forEach(function (entityId) {
+             if (cache.issuesByEntityID[entityId]) {
+               cache.issuesByEntityID[entityId]["delete"](issue.id);
+             }
+           });
+           delete cache.issuesByIssueID[issue.id];
+         };
 
+         cache.uncacheIssues = function (issues) {
+           issues.forEach(cache.uncacheIssue);
+         };
 
-           function setTransform(t2, duration, force) {
-               var t = projection.transform();
-               if (!force && t2.k === t.k && t2.x === t.x && t2.y === t.y) return false;
+         cache.uncacheIssuesOfType = function (type) {
+           var issuesOfType = Object.values(cache.issuesByIssueID).filter(function (issue) {
+             return issue.type === type;
+           });
+           cache.uncacheIssues(issuesOfType);
+         }; //
+         // Remove a single entity and all its related issues from the caches
+         //
 
-               if (duration) {
-                   _selection
-                       .transition()
-                       .duration(duration)
-                       .on('start', function() { map.startEase(); })
-                       .call(_zoomerPanner.transform, identity$2.translate(t2.x, t2.y).scale(t2.k));
-               } else {
-                   projection.transform(t2);
-                   _transformStart = t2;
-                   _selection.call(_zoomerPanner.transform, _transformStart);
-               }
 
-               return true;
-           }
+         cache.uncacheEntityID = function (entityID) {
+           var issueIDs = cache.issuesByEntityID[entityID];
+           if (!issueIDs) return;
+           issueIDs.forEach(function (issueID) {
+             var issue = cache.issuesByIssueID[issueID];
 
+             if (issue) {
+               cache.uncacheIssue(issue);
+             } else {
+               delete cache.issuesByIssueID[issueID];
+             }
+           });
+           delete cache.issuesByEntityID[entityID];
+         };
 
-           function setCenterZoom(loc2, z2, duration, force) {
-               var c = map.center();
-               var z = map.zoom();
-               if (loc2[0] === c[0] && loc2[1] === c[1] && z2 === z && !force) return false;
+         return cache;
+       }
 
-               var proj = geoRawMercator().transform(projection.transform());  // copy projection
+       function coreUploader(context) {
+         var dispatch$1 = dispatch( // Start and end events are dispatched exactly once each per legitimate outside call to `save`
+         'saveStarted', // dispatched as soon as a call to `save` has been deemed legitimate
+         'saveEnded', // dispatched after the result event has been dispatched
+         'willAttemptUpload', // dispatched before the actual upload call occurs, if it will
+         'progressChanged', // Each save results in one of these outcomes:
+         'resultNoChanges', // upload wasn't attempted since there were no edits
+         'resultErrors', // upload failed due to errors
+         'resultConflicts', // upload failed due to data conflicts
+         'resultSuccess' // upload completed without errors
+         );
+         var _isSaving = false;
+         var _conflicts = [];
+         var _errors = [];
 
-               var k2 = clamp(geoZoomToScale(z2, TILESIZE), kMin, kMax);
-               proj.scale(k2);
+         var _origChanges;
 
-               var t = proj.translate();
-               var point = proj(loc2);
+         var _discardTags = {};
+         _mainFileFetcher.get('discarded').then(function (d) {
+           _discardTags = d;
+         })["catch"](function () {
+           /* ignore */
+         });
+         var uploader = utilRebind({}, dispatch$1, 'on');
 
-               var center = pxCenter();
-               t[0] += center[0] - point[0];
-               t[1] += center[1] - point[1];
+         uploader.isSaving = function () {
+           return _isSaving;
+         };
 
-               return setTransform(identity$2.translate(t[0], t[1]).scale(k2), duration, force);
+         uploader.save = function (changeset, tryAgain, checkConflicts) {
+           // Guard against accidentally entering save code twice - #4641
+           if (_isSaving && !tryAgain) {
+             return;
            }
 
+           var osm = context.connection();
+           if (!osm) return; // If user somehow got logged out mid-save, try to reauthenticate..
+           // This can happen if they were logged in from before, but the tokens are no longer valid.
 
-           map.pan = function(delta, duration) {
-               var t = projection.translate();
-               var k = projection.scale();
-
-               t[0] += delta[0];
-               t[1] += delta[1];
-
-               if (duration) {
-                   _selection
-                       .transition()
-                       .duration(duration)
-                       .on('start', function() { map.startEase(); })
-                       .call(_zoomerPanner.transform, identity$2.translate(t[0], t[1]).scale(k));
-               } else {
-                   projection.translate(t);
-                   _transformStart = projection.transform();
-                   _selection.call(_zoomerPanner.transform, _transformStart);
-                   dispatch$1.call('move', this, map);
-                   immediateRedraw();
+           if (!osm.authenticated()) {
+             osm.authenticate(function (err) {
+               if (!err) {
+                 uploader.save(changeset, tryAgain, checkConflicts); // continue where we left off..
                }
+             });
+             return;
+           }
 
-               return map;
-           };
-
-
-           map.dimensions = function(val) {
-               if (!arguments.length) return _dimensions;
+           if (!_isSaving) {
+             _isSaving = true;
+             dispatch$1.call('saveStarted', this);
+           }
 
-               _dimensions = val;
-               drawLayers.dimensions(_dimensions);
-               context.background().dimensions(_dimensions);
-               projection.clipExtent([[0, 0], _dimensions]);
-               _getMouseCoords = utilFastMouse(supersurface.node());
+           var history = context.history();
+           _conflicts = [];
+           _errors = []; // Store original changes, in case user wants to download them as an .osc file
 
-               scheduleRedraw();
-               return map;
-           };
+           _origChanges = history.changes(actionDiscardTags(history.difference(), _discardTags)); // First time, `history.perform` a no-op action.
+           // Any conflict resolutions will be done as `history.replace`
+           // Remember to pop this later if needed
 
+           if (!tryAgain) {
+             history.perform(actionNoop());
+           } // Attempt a fast upload.. If there are conflicts, re-enter with `checkConflicts = true`
 
-           function zoomIn(delta) {
-               setCenterZoom(map.center(), ~~map.zoom() + delta, 250, true);
-           }
 
-           function zoomOut(delta) {
-               setCenterZoom(map.center(), ~~map.zoom() - delta, 250, true);
+           if (!checkConflicts) {
+             upload(changeset); // Do the full (slow) conflict check..
+           } else {
+             performFullConflictCheck(changeset);
            }
+         };
 
-           map.zoomIn = function() { zoomIn(1); };
-           map.zoomInFurther = function() { zoomIn(4); };
-           map.canZoomIn = function() { return map.zoom() < maxZoom; };
-
-           map.zoomOut = function() { zoomOut(1); };
-           map.zoomOutFurther = function() { zoomOut(4); };
-           map.canZoomOut = function() { return map.zoom() > minZoom; };
-
-           map.center = function(loc2) {
-               if (!arguments.length) {
-                   return projection.invert(pxCenter());
-               }
-
-               if (setCenterZoom(loc2, map.zoom())) {
-                   dispatch$1.call('move', this, map);
-               }
+         function performFullConflictCheck(changeset) {
+           var osm = context.connection();
+           if (!osm) return;
+           var history = context.history();
+           var localGraph = context.graph();
+           var remoteGraph = coreGraph(history.base(), true);
+           var summary = history.difference().summary();
+           var _toCheck = [];
 
-               scheduleRedraw();
-               return map;
-           };
+           for (var i = 0; i < summary.length; i++) {
+             var item = summary[i];
 
-           map.unobscuredCenterZoomEase = function(loc, zoom) {
-               var offset = map.unobscuredOffsetPx();
+             if (item.changeType === 'modified') {
+               _toCheck.push(item.entity.id);
+             }
+           }
 
-               var proj = geoRawMercator().transform(projection.transform());  // copy projection
-               // use the target zoom to calculate the offset center
-               proj.scale(geoZoomToScale(zoom, TILESIZE));
+           var _toLoad = withChildNodes(_toCheck, localGraph);
 
-               var locPx = proj(loc);
-               var offsetLocPx = [locPx[0] + offset[0], locPx[1] + offset[1]];
-               var offsetLoc = proj.invert(offsetLocPx);
+           var _loaded = {};
+           var _toLoadCount = 0;
+           var _toLoadTotal = _toLoad.length;
 
-               map.centerZoomEase(offsetLoc, zoom);
-           };
+           if (_toCheck.length) {
+             dispatch$1.call('progressChanged', this, _toLoadCount, _toLoadTotal);
 
-           map.unobscuredOffsetPx = function() {
-               var openPane = context.container().select('.map-panes .map-pane.shown');
-               if (!openPane.empty()) {
-                   return [openPane.node().offsetWidth/2, 0];
-               }
-               return [0, 0];
-           };
+             _toLoad.forEach(function (id) {
+               _loaded[id] = false;
+             });
 
-           map.zoom = function(z2) {
-               if (!arguments.length) {
-                   return Math.max(geoScaleToZoom(projection.scale(), TILESIZE), 0);
-               }
+             osm.loadMultiple(_toLoad, loaded);
+           } else {
+             upload(changeset);
+           }
 
-               if (z2 < _minzoom) {
-                   surface.interrupt();
-                   dispatch$1.call('hitMinZoom', this, map);
-                   z2 = context.minEditableZoom();
-               }
+           return;
 
-               if (setCenterZoom(map.center(), z2)) {
-                   dispatch$1.call('move', this, map);
-               }
+           function withChildNodes(ids, graph) {
+             var s = new Set(ids);
+             ids.forEach(function (id) {
+               var entity = graph.entity(id);
+               if (entity.type !== 'way') return;
+               graph.childNodes(entity).forEach(function (child) {
+                 if (child.version !== undefined) {
+                   s.add(child.id);
+                 }
+               });
+             });
+             return Array.from(s);
+           } // Reload modified entities into an alternate graph and check for conflicts..
 
-               scheduleRedraw();
-               return map;
-           };
 
+           function loaded(err, result) {
+             if (_errors.length) return;
 
-           map.centerZoom = function(loc2, z2) {
-               if (setCenterZoom(loc2, z2)) {
-                   dispatch$1.call('move', this, map);
-               }
+             if (err) {
+               _errors.push({
+                 msg: err.message || err.responseText,
+                 details: [_t('save.status_code', {
+                   code: err.status
+                 })]
+               });
 
-               scheduleRedraw();
-               return map;
-           };
+               didResultInErrors();
+             } else {
+               var loadMore = [];
+               result.data.forEach(function (entity) {
+                 remoteGraph.replace(entity);
+                 _loaded[entity.id] = true;
+                 _toLoad = _toLoad.filter(function (val) {
+                   return val !== entity.id;
+                 });
+                 if (!entity.visible) return; // Because loadMultiple doesn't download /full like loadEntity,
+                 // need to also load children that aren't already being checked..
 
+                 var i, id;
 
-           map.zoomTo = function(entity) {
-               var extent = entity.extent(context.graph());
-               if (!isFinite(extent.area())) return map;
+                 if (entity.type === 'way') {
+                   for (i = 0; i < entity.nodes.length; i++) {
+                     id = entity.nodes[i];
 
-               var z2 = clamp(map.trimmedExtentZoom(extent), 0, 20);
-               return map.centerZoom(extent.center(), z2);
-           };
+                     if (_loaded[id] === undefined) {
+                       _loaded[id] = false;
+                       loadMore.push(id);
+                     }
+                   }
+                 } else if (entity.type === 'relation' && entity.isMultipolygon()) {
+                   for (i = 0; i < entity.members.length; i++) {
+                     id = entity.members[i].id;
 
+                     if (_loaded[id] === undefined) {
+                       _loaded[id] = false;
+                       loadMore.push(id);
+                     }
+                   }
+                 }
+               });
+               _toLoadCount += result.data.length;
+               _toLoadTotal += loadMore.length;
+               dispatch$1.call('progressChanged', this, _toLoadCount, _toLoadTotal);
 
-           map.centerEase = function(loc2, duration) {
-               duration = duration || 250;
-               setCenterZoom(loc2, map.zoom(), duration);
-               return map;
-           };
+               if (loadMore.length) {
+                 _toLoad.push.apply(_toLoad, loadMore);
 
+                 osm.loadMultiple(loadMore, loaded);
+               }
 
-           map.zoomEase = function(z2, duration) {
-               duration = duration || 250;
-               setCenterZoom(map.center(), z2, duration, false);
-               return map;
-           };
+               if (!_toLoad.length) {
+                 detectConflicts();
+                 upload(changeset);
+               }
+             }
+           }
 
+           function detectConflicts() {
+             function choice(id, text, _action) {
+               return {
+                 id: id,
+                 text: text,
+                 action: function action() {
+                   history.replace(_action);
+                 }
+               };
+             }
 
-           map.centerZoomEase = function(loc2, z2, duration) {
-               duration = duration || 250;
-               setCenterZoom(loc2, z2, duration, false);
-               return map;
-           };
+             function formatUser(d) {
+               return '<a href="' + osm.userURL(d) + '" target="_blank">' + d + '</a>';
+             }
 
+             function entityName(entity) {
+               return utilDisplayName(entity) || utilDisplayType(entity.id) + ' ' + entity.id;
+             }
 
-           map.transformEase = function(t2, duration) {
-               duration = duration || 250;
-               setTransform(t2, duration, false /* don't force */);
-               return map;
-           };
+             function sameVersions(local, remote) {
+               if (local.version !== remote.version) return false;
 
+               if (local.type === 'way') {
+                 var children = utilArrayUnion(local.nodes, remote.nodes);
 
-           map.zoomToEase = function(obj, duration) {
-               var extent;
-               if (Array.isArray(obj)) {
-                   obj.forEach(function(entity) {
-                       var entityExtent = entity.extent(context.graph());
-                       if (!extent) {
-                           extent = entityExtent;
-                       } else {
-                           extent = extent.extend(entityExtent);
-                       }
-                   });
-               } else {
-                   extent = obj.extent(context.graph());
+                 for (var i = 0; i < children.length; i++) {
+                   var a = localGraph.hasEntity(children[i]);
+                   var b = remoteGraph.hasEntity(children[i]);
+                   if (a && b && a.version !== b.version) return false;
+                 }
                }
-               if (!isFinite(extent.area())) return map;
-
-               var z2 = clamp(map.trimmedExtentZoom(extent), 0, 20);
-               return map.centerZoomEase(extent.center(), z2, duration);
-           };
 
+               return true;
+             }
 
-           map.startEase = function() {
-               utilBindOnce(surface, _pointerPrefix + 'down.ease', function() {
-                   map.cancelEase();
+             _toCheck.forEach(function (id) {
+               var local = localGraph.entity(id);
+               var remote = remoteGraph.entity(id);
+               if (sameVersions(local, remote)) return;
+               var merge = actionMergeRemoteChanges(id, localGraph, remoteGraph, _discardTags, formatUser);
+               history.replace(merge);
+               var mergeConflicts = merge.conflicts();
+               if (!mergeConflicts.length) return; // merged safely
+
+               var forceLocal = actionMergeRemoteChanges(id, localGraph, remoteGraph, _discardTags).withOption('force_local');
+               var forceRemote = actionMergeRemoteChanges(id, localGraph, remoteGraph, _discardTags).withOption('force_remote');
+               var keepMine = _t('save.conflict.' + (remote.visible ? 'keep_local' : 'restore'));
+               var keepTheirs = _t('save.conflict.' + (remote.visible ? 'keep_remote' : 'delete'));
+
+               _conflicts.push({
+                 id: id,
+                 name: entityName(local),
+                 details: mergeConflicts,
+                 chosen: 1,
+                 choices: [choice(id, keepMine, forceLocal), choice(id, keepTheirs, forceRemote)]
                });
-               return map;
-           };
+             });
+           }
+         }
 
+         function upload(changeset) {
+           var osm = context.connection();
 
-           map.cancelEase = function() {
-               _selection.interrupt();
-               return map;
-           };
+           if (!osm) {
+             _errors.push({
+               msg: 'No OSM Service'
+             });
+           }
 
+           if (_conflicts.length) {
+             didResultInConflicts(changeset);
+           } else if (_errors.length) {
+             didResultInErrors();
+           } else {
+             var history = context.history();
+             var changes = history.changes(actionDiscardTags(history.difference(), _discardTags));
 
-           map.extent = function(val) {
-               if (!arguments.length) {
-                   return new geoExtent(
-                       projection.invert([0, _dimensions[1]]),
-                       projection.invert([_dimensions[0], 0])
-                   );
-               } else {
-                   var extent = geoExtent(val);
-                   map.centerZoom(extent.center(), map.extentZoom(extent));
-               }
-           };
+             if (changes.modified.length || changes.created.length || changes.deleted.length) {
+               dispatch$1.call('willAttemptUpload', this);
+               osm.putChangeset(changeset, changes, uploadCallback);
+             } else {
+               // changes were insignificant or reverted by user
+               didResultInNoChanges();
+             }
+           }
+         }
 
+         function uploadCallback(err, changeset) {
+           if (err) {
+             if (err.status === 409) {
+               // 409 Conflict
+               uploader.save(changeset, true, true); // tryAgain = true, checkConflicts = true
+             } else {
+               _errors.push({
+                 msg: err.message || err.responseText,
+                 details: [_t('save.status_code', {
+                   code: err.status
+                 })]
+               });
 
-           map.trimmedExtent = function(val) {
-               if (!arguments.length) {
-                   var headerY = 71;
-                   var footerY = 30;
-                   var pad = 10;
-                   return new geoExtent(
-                       projection.invert([pad, _dimensions[1] - footerY - pad]),
-                       projection.invert([_dimensions[0] - pad, headerY + pad])
-                   );
-               } else {
-                   var extent = geoExtent(val);
-                   map.centerZoom(extent.center(), map.trimmedExtentZoom(extent));
-               }
-           };
+               didResultInErrors();
+             }
+           } else {
+             didResultInSuccess(changeset);
+           }
+         }
 
+         function didResultInNoChanges() {
+           dispatch$1.call('resultNoChanges', this);
+           endSave();
+           context.flush(); // reset iD
+         }
 
-           function calcExtentZoom(extent, dim) {
-               var tl = projection([extent[0][0], extent[1][1]]);
-               var br = projection([extent[1][0], extent[0][1]]);
+         function didResultInErrors() {
+           context.history().pop();
+           dispatch$1.call('resultErrors', this, _errors);
+           endSave();
+         }
 
-               // Calculate maximum zoom that fits extent
-               var hFactor = (br[0] - tl[0]) / dim[0];
-               var vFactor = (br[1] - tl[1]) / dim[1];
-               var hZoomDiff = Math.log(Math.abs(hFactor)) / Math.LN2;
-               var vZoomDiff = Math.log(Math.abs(vFactor)) / Math.LN2;
-               var newZoom = map.zoom() - Math.max(hZoomDiff, vZoomDiff);
+         function didResultInConflicts(changeset) {
+           _conflicts.sort(function (a, b) {
+             return b.id.localeCompare(a.id);
+           });
 
-               return newZoom;
-           }
+           dispatch$1.call('resultConflicts', this, changeset, _conflicts, _origChanges);
+           endSave();
+         }
 
+         function didResultInSuccess(changeset) {
+           // delete the edit stack cached to local storage
+           context.history().clearSaved();
+           dispatch$1.call('resultSuccess', this, changeset); // Add delay to allow for postgres replication #1646 #2678
 
-           map.extentZoom = function(val) {
-               return calcExtentZoom(geoExtent(val), _dimensions);
-           };
+           window.setTimeout(function () {
+             endSave();
+             context.flush(); // reset iD
+           }, 2500);
+         }
 
+         function endSave() {
+           _isSaving = false;
+           dispatch$1.call('saveEnded', this);
+         }
 
-           map.trimmedExtentZoom = function(val) {
-               var trimY = 120;
-               var trimX = 40;
-               var trimmed = [_dimensions[0] - trimX, _dimensions[1] - trimY];
-               return calcExtentZoom(geoExtent(val), trimmed);
-           };
+         uploader.cancelConflictResolution = function () {
+           context.history().pop();
+         };
 
+         uploader.processResolvedConflicts = function (changeset) {
+           var history = context.history();
 
-           map.withinEditableZoom = function() {
-               return map.zoom() >= context.minEditableZoom();
-           };
+           for (var i = 0; i < _conflicts.length; i++) {
+             if (_conflicts[i].chosen === 1) {
+               // user chose "use theirs"
+               var entity = context.hasEntity(_conflicts[i].id);
 
+               if (entity && entity.type === 'way') {
+                 var children = utilArrayUniq(entity.nodes);
 
-           map.isInWideSelection = function() {
-               return !map.withinEditableZoom() && context.selectedIDs().length;
-           };
+                 for (var j = 0; j < children.length; j++) {
+                   history.replace(actionRevert(children[j]));
+                 }
+               }
 
+               history.replace(actionRevert(_conflicts[i].id));
+             }
+           }
 
-           map.editableDataEnabled = function(skipZoomCheck) {
+           uploader.save(changeset, true, false); // tryAgain = true, checkConflicts = false
+         };
 
-               var layer = context.layers().layer('osm');
-               if (!layer || !layer.enabled()) return false;
+         uploader.reset = function () {};
 
-               return skipZoomCheck || map.withinEditableZoom();
-           };
+         return uploader;
+       }
 
+       var abs$4 = Math.abs;
+       var exp$2 = Math.exp;
+       var E = Math.E;
 
-           map.notesEditable = function() {
-               var layer = context.layers().layer('notes');
-               if (!layer || !layer.enabled()) return false;
+       var FORCED$g = fails(function () {
+         return Math.sinh(-2e-17) != -2e-17;
+       });
 
-               return map.withinEditableZoom();
-           };
+       // `Math.sinh` method
+       // https://tc39.github.io/ecma262/#sec-math.sinh
+       // V8 near Chromium 38 has a problem with very small numbers
+       _export({ target: 'Math', stat: true, forced: FORCED$g }, {
+         sinh: function sinh(x) {
+           return abs$4(x = +x) < 1 ? (mathExpm1(x) - mathExpm1(-x)) / 2 : (exp$2(x - 1) - exp$2(-x - 1)) * (E / 2);
+         }
+       });
 
+       var isRetina = window.devicePixelRatio && window.devicePixelRatio >= 2; // listen for DPI change, e.g. when dragging a browser window from a retina to non-retina screen
 
-           map.minzoom = function(val) {
-               if (!arguments.length) return _minzoom;
-               _minzoom = val;
-               return map;
-           };
+       window.matchMedia("\n        (-webkit-min-device-pixel-ratio: 2), /* Safari */\n        (min-resolution: 2dppx),             /* standard */\n        (min-resolution: 192dpi)             /* fallback */\n    ").addListener(function () {
+         isRetina = window.devicePixelRatio && window.devicePixelRatio >= 2;
+       });
 
+       function localeDateString(s) {
+         if (!s) return null;
+         var options = {
+           day: 'numeric',
+           month: 'short',
+           year: 'numeric'
+         };
+         var d = new Date(s);
+         if (isNaN(d.getTime())) return null;
+         return d.toLocaleDateString(_mainLocalizer.localeCode(), options);
+       }
 
-           map.toggleHighlightEdited = function() {
-               surface.classed('highlight-edited', !surface.classed('highlight-edited'));
-               map.pan([0,0]);  // trigger a redraw
-               dispatch$1.call('changeHighlighting', this);
-           };
+       function vintageRange(vintage) {
+         var s;
 
+         if (vintage.start || vintage.end) {
+           s = vintage.start || '?';
 
-           map.areaFillOptions = ['wireframe', 'partial', 'full'];
+           if (vintage.start !== vintage.end) {
+             s += ' - ' + (vintage.end || '?');
+           }
+         }
 
-           map.activeAreaFill = function(val) {
-               if (!arguments.length) return corePreferences('area-fill') || 'partial';
+         return s;
+       }
 
-               corePreferences('area-fill', val);
-               if (val !== 'wireframe') {
-                   corePreferences('area-fill-toggle', val);
-               }
-               updateAreaFill();
-               map.pan([0,0]);  // trigger a redraw
-               dispatch$1.call('changeAreaFill', this);
-               return map;
-           };
+       function rendererBackgroundSource(data) {
+         var source = Object.assign({}, data); // shallow copy
 
-           map.toggleWireframe = function() {
+         var _offset = [0, 0];
+         var _name = source.name;
+         var _description = source.description;
 
-               var activeFill = map.activeAreaFill();
+         var _best = !!source.best;
 
-               if (activeFill === 'wireframe') {
-                   activeFill = corePreferences('area-fill-toggle') || 'partial';
-               } else {
-                   activeFill = 'wireframe';
-               }
+         var _template = source.encrypted ? utilAesDecrypt(source.template) : source.template;
 
-               map.activeAreaFill(activeFill);
-           };
+         source.tileSize = data.tileSize || 256;
+         source.zoomExtent = data.zoomExtent || [0, 22];
+         source.overzoom = data.overzoom !== false;
 
-           function updateAreaFill() {
-               var activeFill = map.activeAreaFill();
-               map.areaFillOptions.forEach(function(opt) {
-                   surface.classed('fill-' + opt, Boolean(opt === activeFill));
-               });
-           }
+         source.offset = function (val) {
+           if (!arguments.length) return _offset;
+           _offset = val;
+           return source;
+         };
 
+         source.nudge = function (val, zoomlevel) {
+           _offset[0] += val[0] / Math.pow(2, zoomlevel);
+           _offset[1] += val[1] / Math.pow(2, zoomlevel);
+           return source;
+         };
 
-           map.layers = () => drawLayers;
+         source.name = function () {
+           var id_safe = source.id.replace(/\./g, '<TX_DOT>');
+           return _t('imagery.' + id_safe + '.name', {
+             "default": _name
+           });
+         };
 
+         source.label = function () {
+           var id_safe = source.id.replace(/\./g, '<TX_DOT>');
+           return _t.html('imagery.' + id_safe + '.name', {
+             "default": _name
+           });
+         };
 
-           map.doubleUpHandler = function() {
-               return _doubleUpHandler;
-           };
+         source.description = function () {
+           var id_safe = source.id.replace(/\./g, '<TX_DOT>');
+           return _t.html('imagery.' + id_safe + '.description', {
+             "default": _description
+           });
+         };
 
+         source.best = function () {
+           return _best;
+         };
 
-           return utilRebind(map, dispatch$1, 'on');
-       }
+         source.area = function () {
+           if (!data.polygon) return Number.MAX_VALUE; // worldwide
 
-       function rendererPhotos(context) {
-           var dispatch$1 = dispatch('change');
-           var _layerIDs = ['streetside', 'mapillary', 'mapillary-map-features', 'mapillary-signs', 'openstreetcam'];
-           var _allPhotoTypes = ['flat', 'panoramic'];
-           var _shownPhotoTypes = _allPhotoTypes.slice();   // shallow copy
+           var area = d3_geoArea({
+             type: 'MultiPolygon',
+             coordinates: [data.polygon]
+           });
+           return isNaN(area) ? 0 : area;
+         };
 
-           function photos() {}
+         source.imageryUsed = function () {
+           return _name || source.id;
+         };
 
-           function updateStorage() {
-               if (window.mocha) return;
+         source.template = function (val) {
+           if (!arguments.length) return _template;
 
-               var hash = utilStringQs(window.location.hash);
-               var enabled = context.layers().all().filter(function(d) {
-                   return _layerIDs.indexOf(d.id) !== -1 && d.layer && d.layer.supported() && d.layer.enabled();
-               }).map(function(d) {
-                   return d.id;
-               });
-               if (enabled.length) {
-                   hash.photo_overlay = enabled.join(',');
-               } else {
-                   delete hash.photo_overlay;
-               }
-               window.location.replace('#' + utilQsString(hash, true));
+           if (source.id === 'custom') {
+             _template = val;
            }
 
-           photos.overlayLayerIDs = function() {
-               return _layerIDs;
-           };
+           return source;
+         };
 
-           photos.allPhotoTypes = function() {
-               return _allPhotoTypes;
-           };
+         source.url = function (coord) {
+           var result = _template;
+           if (result === '') return result; // source 'none'
+           // Guess a type based on the tokens present in the template
+           // (This is for 'custom' source, where we don't know)
 
-           function showsLayer(id) {
-               var layer = context.layers().layer(id);
-               return layer && layer.supported() && layer.enabled();
+           if (!source.type) {
+             if (/SERVICE=WMS|\{(proj|wkid|bbox)\}/.test(_template)) {
+               source.type = 'wms';
+               source.projection = 'EPSG:3857'; // guess
+             } else if (/\{(x|y)\}/.test(_template)) {
+               source.type = 'tms';
+             } else if (/\{u\}/.test(_template)) {
+               source.type = 'bing';
+             }
            }
 
-           photos.shouldFilterByPhotoType = function() {
-               return showsLayer('mapillary') ||
-                   (showsLayer('streetside') && showsLayer('openstreetcam'));
-           };
-
-           photos.showsPhotoType = function(val) {
-               if (!photos.shouldFilterByPhotoType()) return true;
-
-               return _shownPhotoTypes.indexOf(val) !== -1;
-           };
-
-           photos.showsFlat = function() {
-               return photos.showsPhotoType('flat');
-           };
+           if (source.type === 'wms') {
+             var tileToProjectedCoords = function tileToProjectedCoords(x, y, z) {
+               //polyfill for IE11, PhantomJS
+               var sinh = Math.sinh || function (x) {
+                 var y = Math.exp(x);
+                 return (y - 1 / y) / 2;
+               };
 
-           photos.showsPanoramic = function() {
-               return photos.showsPhotoType('panoramic');
-           };
+               var zoomSize = Math.pow(2, z);
+               var lon = x / zoomSize * Math.PI * 2 - Math.PI;
+               var lat = Math.atan(sinh(Math.PI * (1 - 2 * y / zoomSize)));
 
-           photos.togglePhotoType = function(val) {
-               var index = _shownPhotoTypes.indexOf(val);
-               if (index !== -1) {
-                   _shownPhotoTypes.splice(index, 1);
-               } else {
-                   _shownPhotoTypes.push(val);
-               }
-               dispatch$1.call('change', this);
-               return photos;
-           };
+               switch (source.projection) {
+                 case 'EPSG:4326':
+                   return {
+                     x: lon * 180 / Math.PI,
+                     y: lat * 180 / Math.PI
+                   };
 
-           photos.init = function() {
-               var hash = utilStringQs(window.location.hash);
-               if (hash.photo_overlay) {
-                   var hashOverlayIDs = hash.photo_overlay.replace(/;/g, ',').split(',');
-                   hashOverlayIDs.forEach(function(id) {
-                       var layer = context.layers().layer(id);
-                       if (layer) layer.enabled(true);
-                   });
+                 default:
+                   // EPSG:3857 and synonyms
+                   var mercCoords = mercatorRaw(lon, lat);
+                   return {
+                     x: 20037508.34 / Math.PI * mercCoords[0],
+                     y: 20037508.34 / Math.PI * mercCoords[1]
+                   };
                }
+             };
 
-               context.layers().on('change.rendererPhotos', updateStorage);
-           };
+             var tileSize = source.tileSize;
+             var projection = source.projection;
+             var minXmaxY = tileToProjectedCoords(coord[0], coord[1], coord[2]);
+             var maxXminY = tileToProjectedCoords(coord[0] + 1, coord[1] + 1, coord[2]);
+             result = result.replace(/\{(\w+)\}/g, function (token, key) {
+               switch (key) {
+                 case 'width':
+                 case 'height':
+                   return tileSize;
+
+                 case 'proj':
+                   return projection;
+
+                 case 'wkid':
+                   return projection.replace(/^EPSG:/, '');
+
+                 case 'bbox':
+                   // WMS 1.3 flips x/y for some coordinate systems including EPSG:4326 - #7557
+                   if (projection === 'EPSG:4326' && // The CRS parameter implies version 1.3 (prior versions use SRS)
+                   /VERSION=1.3|CRS={proj}/.test(source.template())) {
+                     return maxXminY.y + ',' + minXmaxY.x + ',' + minXmaxY.y + ',' + maxXminY.x;
+                   } else {
+                     return minXmaxY.x + ',' + maxXminY.y + ',' + maxXminY.x + ',' + minXmaxY.y;
+                   }
 
-           return utilRebind(photos, dispatch$1, 'on');
-       }
+                 case 'w':
+                   return minXmaxY.x;
 
-       function uiAccount(context) {
-           var osm = context.connection();
+                 case 's':
+                   return maxXminY.y;
 
+                 case 'n':
+                   return maxXminY.x;
 
-           function update(selection) {
-               if (!osm) return;
+                 case 'e':
+                   return minXmaxY.y;
 
-               if (!osm.authenticated()) {
-                   selection.selectAll('.userLink, .logoutLink')
-                       .classed('hide', true);
-                   return;
+                 default:
+                   return token;
                }
+             });
+           } else if (source.type === 'tms') {
+             result = result.replace('{x}', coord[0]).replace('{y}', coord[1]) // TMS-flipped y coordinate
+             .replace(/\{[t-]y\}/, Math.pow(2, coord[2]) - coord[1] - 1).replace(/\{z(oom)?\}/, coord[2]) // only fetch retina tiles for retina screens
+             .replace(/\{@2x\}|\{r\}/, isRetina ? '@2x' : '');
+           } else if (source.type === 'bing') {
+             result = result.replace('{u}', function () {
+               var u = '';
+
+               for (var zoom = coord[2]; zoom > 0; zoom--) {
+                 var b = 0;
+                 var mask = 1 << zoom - 1;
+                 if ((coord[0] & mask) !== 0) b++;
+                 if ((coord[1] & mask) !== 0) b += 2;
+                 u += b.toString();
+               }
+
+               return u;
+             });
+           } // these apply to any type..
 
-               osm.userDetails(function(err, details) {
-                   var userLink = selection.select('.userLink'),
-                       logoutLink = selection.select('.logoutLink');
-
-                   userLink.html('');
-                   logoutLink.html('');
-
-                   if (err || !details) return;
-
-                   selection.selectAll('.userLink, .logoutLink')
-                       .classed('hide', false);
 
-                   // Link
-                   userLink.append('a')
-                       .attr('href', osm.userURL(details.display_name))
-                       .attr('target', '_blank');
+           result = result.replace(/\{switch:([^}]+)\}/, function (s, r) {
+             var subdomains = r.split(',');
+             return subdomains[(coord[0] + coord[1]) % subdomains.length];
+           });
+           return result;
+         };
 
-                   // Add thumbnail or dont
-                   if (details.image_url) {
-                       userLink.append('img')
-                           .attr('class', 'icon pre-text user-icon')
-                           .attr('src', details.image_url);
-                   } else {
-                       userLink
-                           .call(svgIcon('#iD-icon-avatar', 'pre-text light'));
-                   }
+         source.validZoom = function (z) {
+           return source.zoomExtent[0] <= z && (source.overzoom || source.zoomExtent[1] > z);
+         };
 
-                   // Add user name
-                   userLink.append('span')
-                       .attr('class', 'label')
-                       .text(details.display_name);
-
-                   logoutLink.append('a')
-                       .attr('class', 'logout')
-                       .attr('href', '#')
-                       .text(_t('logout'))
-                       .on('click.logout', function() {
-                           event.preventDefault();
-                           osm.logout();
-                       });
-               });
-           }
+         source.isLocatorOverlay = function () {
+           return source.id === 'mapbox_locator_overlay';
+         };
+         /* hides a source from the list, but leaves it available for use */
 
 
-           return function(selection) {
-               selection.append('li')
-                   .attr('class', 'logoutLink')
-                   .classed('hide', true);
+         source.isHidden = function () {
+           return source.id === 'DigitalGlobe-Premium-vintage' || source.id === 'DigitalGlobe-Standard-vintage';
+         };
 
-               selection.append('li')
-                   .attr('class', 'userLink')
-                   .classed('hide', true);
+         source.copyrightNotices = function () {};
 
-               if (osm) {
-                   osm.on('change.account', function() { update(selection); });
-                   update(selection);
-               }
+         source.getMetadata = function (center, tileCoord, callback) {
+           var vintage = {
+             start: localeDateString(source.startDate),
+             end: localeDateString(source.endDate)
            };
-       }
-
-       function uiAttribution(context) {
-         let _selection = select(null);
-
-
-         function render(selection, data, klass) {
-           let div = selection.selectAll(`.${klass}`)
-             .data([0]);
-
-           div = div.enter()
-             .append('div')
-             .attr('class', klass)
-             .merge(div);
+           vintage.range = vintageRange(vintage);
+           var metadata = {
+             vintage: vintage
+           };
+           callback(null, metadata);
+         };
 
+         return source;
+       }
 
-           let attributions = div.selectAll('.attribution')
-             .data(data, d => d.id);
+       rendererBackgroundSource.Bing = function (data, dispatch) {
+         // http://msdn.microsoft.com/en-us/library/ff701716.aspx
+         // http://msdn.microsoft.com/en-us/library/ff701701.aspx
+         data.template = 'https://ecn.t{switch:0,1,2,3}.tiles.virtualearth.net/tiles/a{u}.jpeg?g=587&mkt=en-gb&n=z';
+         var bing = rendererBackgroundSource(data); // var key = 'Arzdiw4nlOJzRwOz__qailc8NiR31Tt51dN2D7cm57NrnceZnCpgOkmJhNpGoppU'; // P2, JOSM, etc
 
-           attributions.exit()
-             .remove();
+         var key = 'Ak5oTE46TUbjRp08OFVcGpkARErDobfpuyNKa-W2mQ8wbt1K1KL8p1bIRwWwcF-Q'; // iD
 
-           attributions = attributions.enter()
-             .append('span')
-             .attr('class', 'attribution')
-             .each((d, i, nodes) => {
-               let attribution = select(nodes[i]);
+         var url = 'https://dev.virtualearth.net/REST/v1/Imagery/Metadata/Aerial?include=ImageryProviders&key=' + key;
+         var cache = {};
+         var inflight = {};
+         var providers = [];
+         d3_json(url).then(function (json) {
+           providers = json.resourceSets[0].resources[0].imageryProviders.map(function (provider) {
+             return {
+               attribution: provider.attribution,
+               areas: provider.coverageAreas.map(function (area) {
+                 return {
+                   zoom: [area.zoomMin, area.zoomMax],
+                   extent: geoExtent([area.bbox[1], area.bbox[0]], [area.bbox[3], area.bbox[2]])
+                 };
+               })
+             };
+           });
+           dispatch.call('change');
+         })["catch"](function () {
+           /* ignore */
+         });
 
-               if (d.terms_html) {
-                 attribution.html(d.terms_html);
-                 return;
-               }
+         bing.copyrightNotices = function (zoom, extent) {
+           zoom = Math.min(zoom, 21);
+           return providers.filter(function (provider) {
+             return provider.areas.some(function (area) {
+               return extent.intersects(area.extent) && area.zoom[0] <= zoom && area.zoom[1] >= zoom;
+             });
+           }).map(function (provider) {
+             return provider.attribution;
+           }).join(', ');
+         };
 
-               if (d.terms_url) {
-                 attribution = attribution
-                   .append('a')
-                   .attr('href', d.terms_url)
-                   .attr('target', '_blank');
-               }
+         bing.getMetadata = function (center, tileCoord, callback) {
+           var tileID = tileCoord.slice(0, 3).join('/');
+           var zoom = Math.min(tileCoord[2], 21);
+           var centerPoint = center[1] + ',' + center[0]; // lat,lng
 
-               const sourceID = d.id.replace(/\./g, '<TX_DOT>');
-               const terms_text = _t(`imagery.${sourceID}.attribution.text`,
-                 { default: d.terms_text || d.id || d.name() }
-               );
+           var url = 'https://dev.virtualearth.net/REST/v1/Imagery/Metadata/Aerial/' + centerPoint + '?zl=' + zoom + '&key=' + key;
+           if (inflight[tileID]) return;
 
-               if (d.icon && !d.overlay) {
-                 attribution
-                   .append('img')
-                   .attr('class', 'source-image')
-                   .attr('src', d.icon);
-               }
+           if (!cache[tileID]) {
+             cache[tileID] = {};
+           }
 
-               attribution
-                 .append('span')
-                 .attr('class', 'attribution-text')
-                 .text(terms_text);
-             })
-             .merge(attributions);
+           if (cache[tileID] && cache[tileID].metadata) {
+             return callback(null, cache[tileID].metadata);
+           }
 
+           inflight[tileID] = true;
+           d3_json(url).then(function (result) {
+             delete inflight[tileID];
 
-           let copyright = attributions.selectAll('.copyright-notice')
-             .data(d => {
-               let notice = d.copyrightNotices(context.map().zoom(), context.map().extent());
-               return notice ? [notice] : [];
-             });
+             if (!result) {
+               throw new Error('Unknown Error');
+             }
 
-           copyright.exit()
-             .remove();
+             var vintage = {
+               start: localeDateString(result.resourceSets[0].resources[0].vintageStart),
+               end: localeDateString(result.resourceSets[0].resources[0].vintageEnd)
+             };
+             vintage.range = vintageRange(vintage);
+             var metadata = {
+               vintage: vintage
+             };
+             cache[tileID].metadata = metadata;
+             if (callback) callback(null, metadata);
+           })["catch"](function (err) {
+             delete inflight[tileID];
+             if (callback) callback(err.message);
+           });
+         };
 
-           copyright = copyright.enter()
-             .append('span')
-             .attr('class', 'copyright-notice')
-             .merge(copyright);
+         bing.terms_url = 'https://blog.openstreetmap.org/2010/11/30/microsoft-imagery-details';
+         return bing;
+       };
 
-           copyright
-             .text(String);
+       rendererBackgroundSource.Esri = function (data) {
+         // in addition to using the tilemap at zoom level 20, overzoom real tiles - #4327 (deprecated technique, but it works)
+         if (data.template.match(/blankTile/) === null) {
+           data.template = data.template + '?blankTile=false';
          }
 
+         var esri = rendererBackgroundSource(data);
+         var cache = {};
+         var inflight = {};
 
-         function update() {
-           let baselayer = context.background().baseLayerSource();
-           _selection
-             .call(render, (baselayer ? [baselayer] : []), 'base-layer-attribution');
+         var _prevCenter; // use a tilemap service to set maximum zoom for esri tiles dynamically
+         // https://developers.arcgis.com/documentation/tiled-elevation-service/
 
-           const z = context.map().zoom();
-           let overlays = context.background().overlayLayerSources() || [];
-           _selection
-             .call(render, overlays.filter(s => s.validZoom(z)), 'overlay-layer-attribution');
-         }
 
+         esri.fetchTilemap = function (center) {
+           // skip if we have already fetched a tilemap within 5km
+           if (_prevCenter && geoSphericalDistance(center, _prevCenter) < 5000) return;
+           _prevCenter = center; // tiles are available globally to zoom level 19, afterward they may or may not be present
 
-         return function(selection) {
-           _selection = selection;
+           var z = 20; // first generate a random url using the template
 
-           context.background()
-             .on('change.attribution', update);
+           var dummyUrl = esri.url([1, 2, 3]); // calculate url z/y/x from the lat/long of the center of the map
 
-           context.map()
-             .on('move.attribution', throttle(update, 400, { leading: false }));
+           var x = Math.floor((center[0] + 180) / 360 * Math.pow(2, z));
+           var y = Math.floor((1 - Math.log(Math.tan(center[1] * Math.PI / 180) + 1 / Math.cos(center[1] * Math.PI / 180)) / Math.PI) / 2 * Math.pow(2, z)); // fetch an 8x8 grid to leverage cache
 
-           update();
-         };
-       }
+           var tilemapUrl = dummyUrl.replace(/tile\/[0-9]+\/[0-9]+\/[0-9]+\?blankTile=false/, 'tilemap') + '/' + z + '/' + y + '/' + x + '/8/8'; // make the request and introspect the response from the tilemap server
 
-       function uiContributors(context) {
-           var osm = context.connection(),
-               debouncedUpdate = debounce(function() { update(); }, 1000),
-               limit = 4,
-               hidden = false,
-               wrap = select(null);
+           d3_json(tilemapUrl).then(function (tilemap) {
+             if (!tilemap) {
+               throw new Error('Unknown Error');
+             }
 
+             var hasTiles = true;
 
-           function update() {
-               if (!osm) return;
+             for (var i = 0; i < tilemap.data.length; i++) {
+               // 0 means an individual tile in the grid doesn't exist
+               if (!tilemap.data[i]) {
+                 hasTiles = false;
+                 break;
+               }
+             } // if any tiles are missing at level 20 we restrict maxZoom to 19
 
-               var users = {},
-                   entities = context.history().intersects(context.map().extent());
 
-               entities.forEach(function(entity) {
-                   if (entity && entity.user) users[entity.user] = true;
-               });
+             esri.zoomExtent[1] = hasTiles ? 22 : 19;
+           })["catch"](function () {
+             /* ignore */
+           });
+         };
 
-               var u = Object.keys(users),
-                   subset = u.slice(0, u.length > limit ? limit - 1 : limit);
+         esri.getMetadata = function (center, tileCoord, callback) {
+           var tileID = tileCoord.slice(0, 3).join('/');
+           var zoom = Math.min(tileCoord[2], esri.zoomExtent[1]);
+           var centerPoint = center[0] + ',' + center[1]; // long, lat (as it should be)
 
-               wrap.html('')
-                   .call(svgIcon('#iD-icon-nearby', 'pre-text light'));
+           var unknown = _t('info_panels.background.unknown');
+           var metadataLayer;
+           var vintage = {};
+           var metadata = {};
+           if (inflight[tileID]) return;
 
-               var userList = select(document.createElement('span'));
+           switch (true) {
+             case zoom >= 20 && esri.id === 'EsriWorldImageryClarity':
+               metadataLayer = 4;
+               break;
 
-               userList.selectAll()
-                   .data(subset)
-                   .enter()
-                   .append('a')
-                   .attr('class', 'user-link')
-                   .attr('href', function(d) { return osm.userURL(d); })
-                   .attr('target', '_blank')
-                   .text(String);
-
-               if (u.length > limit) {
-                   var count = select(document.createElement('span'));
-
-                   count.append('a')
-                       .attr('target', '_blank')
-                       .attr('href', function() {
-                           return osm.changesetsURL(context.map().center(), context.map().zoom());
-                       })
-                       .text(u.length - limit + 1);
+             case zoom >= 19:
+               metadataLayer = 3;
+               break;
 
-                   wrap.append('span')
-                       .html(_t('contributors.truncated_list', { users: userList.html(), count: count.html() }));
+             case zoom >= 17:
+               metadataLayer = 2;
+               break;
 
-               } else {
-                   wrap.append('span')
-                       .html(_t('contributors.list', { users: userList.html() }));
-               }
+             case zoom >= 13:
+               metadataLayer = 0;
+               break;
+
+             default:
+               metadataLayer = 99;
+           }
 
-               if (!u.length) {
-                   hidden = true;
-                   wrap
-                       .transition()
-                       .style('opacity', 0);
+           var url; // build up query using the layer appropriate to the current zoom
 
-               } else if (hidden) {
-                   wrap
-                       .transition()
-                       .style('opacity', 1);
-               }
+           if (esri.id === 'EsriWorldImagery') {
+             url = 'https://services.arcgisonline.com/arcgis/rest/services/World_Imagery/MapServer/';
+           } else if (esri.id === 'EsriWorldImageryClarity') {
+             url = 'https://serviceslab.arcgisonline.com/arcgis/rest/services/Clarity_World_Imagery/MapServer/';
            }
 
+           url += metadataLayer + '/query?returnGeometry=false&geometry=' + centerPoint + '&inSR=4326&geometryType=esriGeometryPoint&outFields=*&f=json';
 
-           return function(selection) {
-               if (!osm) return;
-               wrap = selection;
-               update();
+           if (!cache[tileID]) {
+             cache[tileID] = {};
+           }
 
-               osm.on('loaded.contributors', debouncedUpdate);
-               context.map().on('move.contributors', debouncedUpdate);
-           };
-       }
+           if (cache[tileID] && cache[tileID].metadata) {
+             return callback(null, cache[tileID].metadata);
+           } // accurate metadata is only available >= 13
 
-       var _popoverID = 0;
 
-       function uiPopover(klass) {
-           var _id = _popoverID++;
-           var _anchorSelection = select(null);
-           var popover = function(selection) {
-               _anchorSelection = selection;
-               selection.each(setup);
-           };
-           var _animation = utilFunctor(false);
-           var _placement = utilFunctor('top'); // top, bottom, left, right
-           var _alignment = utilFunctor('center');  // leading, center, trailing
-           var _scrollContainer = utilFunctor(select(null));
-           var _content;
-           var _displayType = utilFunctor('');
-           var _hasArrow = utilFunctor(true);
-
-           // use pointer events on supported platforms; fallback to mouse events
-           var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
-
-           popover.displayType = function(val) {
-               if (arguments.length) {
-                   _displayType = utilFunctor(val);
-                   return popover;
-               } else {
-                   return _displayType;
-               }
-           };
+           if (metadataLayer === 99) {
+             vintage = {
+               start: null,
+               end: null,
+               range: null
+             };
+             metadata = {
+               vintage: null,
+               source: unknown,
+               description: unknown,
+               resolution: unknown,
+               accuracy: unknown
+             };
+             callback(null, metadata);
+           } else {
+             inflight[tileID] = true;
+             d3_json(url).then(function (result) {
+               delete inflight[tileID];
+
+               if (!result) {
+                 throw new Error('Unknown Error');
+               } else if (result.features && result.features.length < 1) {
+                 throw new Error('No Results');
+               } else if (result.error && result.error.message) {
+                 throw new Error(result.error.message);
+               } // pass through the discrete capture date from metadata
+
+
+               var captureDate = localeDateString(result.features[0].attributes.SRC_DATE2);
+               vintage = {
+                 start: captureDate,
+                 end: captureDate,
+                 range: captureDate
+               };
+               metadata = {
+                 vintage: vintage,
+                 source: clean(result.features[0].attributes.NICE_NAME),
+                 description: clean(result.features[0].attributes.NICE_DESC),
+                 resolution: clean(+parseFloat(result.features[0].attributes.SRC_RES).toFixed(4)),
+                 accuracy: clean(+parseFloat(result.features[0].attributes.SRC_ACC).toFixed(4))
+               }; // append units - meters
 
-           popover.hasArrow = function(val) {
-               if (arguments.length) {
-                   _hasArrow = utilFunctor(val);
-                   return popover;
-               } else {
-                   return _hasArrow;
+               if (isFinite(metadata.resolution)) {
+                 metadata.resolution += ' m';
                }
-           };
 
-           popover.placement = function(val) {
-               if (arguments.length) {
-                   _placement = utilFunctor(val);
-                   return popover;
-               } else {
-                   return _placement;
+               if (isFinite(metadata.accuracy)) {
+                 metadata.accuracy += ' m';
                }
-           };
 
-           popover.alignment = function(val) {
-               if (arguments.length) {
-                   _alignment = utilFunctor(val);
-                   return popover;
-               } else {
-                   return _alignment;
-               }
-           };
+               cache[tileID].metadata = metadata;
+               if (callback) callback(null, metadata);
+             })["catch"](function (err) {
+               delete inflight[tileID];
+               if (callback) callback(err.message);
+             });
+           }
 
-           popover.scrollContainer = function(val) {
-               if (arguments.length) {
-                   _scrollContainer = utilFunctor(val);
-                   return popover;
-               } else {
-                   return _scrollContainer;
-               }
-           };
+           function clean(val) {
+             return String(val).trim() || unknown;
+           }
+         };
 
-           popover.content = function(val) {
-               if (arguments.length) {
-                   _content = val;
-                   return popover;
-               } else {
-                   return _content;
-               }
-           };
+         return esri;
+       };
 
-           popover.isShown = function() {
-               var popoverSelection = _anchorSelection.select('.popover-' + _id);
-               return !popoverSelection.empty() && popoverSelection.classed('in');
-           };
+       rendererBackgroundSource.None = function () {
+         var source = rendererBackgroundSource({
+           id: 'none',
+           template: ''
+         });
 
-           popover.show = function() {
-               _anchorSelection.each(show);
-           };
+         source.name = function () {
+           return _t('background.none');
+         };
 
-           popover.updateContent = function() {
-               _anchorSelection.each(updateContent);
-           };
+         source.label = function () {
+           return _t.html('background.none');
+         };
 
-           popover.hide = function() {
-               _anchorSelection.each(hide);
-           };
+         source.imageryUsed = function () {
+           return null;
+         };
 
-           popover.toggle = function() {
-               _anchorSelection.each(toggle);
-           };
+         source.area = function () {
+           return -1; // sources in background pane are sorted by area
+         };
 
-           popover.destroy = function(selection, selector) {
-               // by default, just destroy the current popover
-               selector = selector || '.popover-' + _id;
-
-               selection
-                   .on(_pointerPrefix + 'enter.popover', null)
-                   .on(_pointerPrefix + 'leave.popover', null)
-                   .on(_pointerPrefix + 'up.popover', null)
-                   .on(_pointerPrefix + 'down.popover', null)
-                   .on('click.popover', null)
-                   .attr('title', function() {
-                       return this.getAttribute('data-original-title') || this.getAttribute('title');
-                   })
-                   .attr('data-original-title', null)
-                   .selectAll(selector)
-                   .remove();
-           };
+         return source;
+       };
 
+       rendererBackgroundSource.Custom = function (template) {
+         var source = rendererBackgroundSource({
+           id: 'custom',
+           template: template
+         });
 
-           popover.destroyAny = function(selection) {
-               selection.call(popover.destroy, '.popover');
-           };
+         source.name = function () {
+           return _t('background.custom');
+         };
 
-           function setup() {
-               var anchor = select(this);
-               var animate = _animation.apply(this, arguments);
-               var popoverSelection = anchor.selectAll('.popover-' + _id)
-                   .data([0]);
+         source.label = function () {
+           return _t.html('background.custom');
+         };
 
+         source.imageryUsed = function () {
+           // sanitize personal connection tokens - #6801
+           var cleaned = source.template(); // from query string parameters
 
-               var enter = popoverSelection.enter()
-                   .append('div')
-                   .attr('class', 'popover popover-' + _id + ' ' + (klass ? klass : ''))
-                   .classed('arrowed', _hasArrow.apply(this, arguments));
+           if (cleaned.indexOf('?') !== -1) {
+             var parts = cleaned.split('?', 2);
+             var qs = utilStringQs(parts[1]);
+             ['access_token', 'connectId', 'token'].forEach(function (param) {
+               if (qs[param]) {
+                 qs[param] = '{apikey}';
+               }
+             });
+             cleaned = parts[0] + '?' + utilQsString(qs, true); // true = soft encode
+           } // from wms/wmts api path parameters
 
-               enter
-                   .append('div')
-                   .attr('class', 'popover-arrow');
 
-               enter
-                   .append('div')
-                   .attr('class', 'popover-inner');
+           cleaned = cleaned.replace(/token\/(\w+)/, 'token/{apikey}');
+           return 'Custom (' + cleaned + ' )';
+         };
 
-               popoverSelection = enter
-                   .merge(popoverSelection);
+         source.area = function () {
+           return -2; // sources in background pane are sorted by area
+         };
 
-               if (animate) {
-                   popoverSelection.classed('fade', true);
-               }
+         return source;
+       };
 
-               var display = _displayType.apply(this, arguments);
+       function rendererTileLayer(context) {
+         var transformProp = utilPrefixCSSProperty('Transform');
+         var tiler = utilTiler();
+         var _tileSize = 256;
 
-               if (display === 'hover') {
-                   var _lastNonMouseEnterTime;
-                   anchor.on(_pointerPrefix + 'enter.popover', function() {
+         var _projection;
 
-                       if (event.pointerType) {
-                           if (event.pointerType !== 'mouse') {
-                               _lastNonMouseEnterTime = event.timeStamp;
-                               // only allow hover behavior for mouse input
-                               return;
-                           } else if (_lastNonMouseEnterTime &&
-                               event.timeStamp - _lastNonMouseEnterTime < 1500) {
-                               // HACK: iOS 13.4 sends an erroneous `mouse` type pointerenter
-                               // event for non-mouse interactions right after sending
-                               // the correct type pointerenter event. Workaround by discarding
-                               // any mouse event that occurs immediately after a non-mouse event.
-                               return;
-                           }
-                       }
+         var _cache = {};
 
-                       // don't show if buttons are pressed, e.g. during click and drag of map
-                       if (event.buttons !== 0) return;
+         var _tileOrigin;
 
-                       show.apply(this, arguments);
-                   });
-                   anchor.on(_pointerPrefix + 'leave.popover', function() {
-                       hide.apply(this, arguments);
-                   });
+         var _zoom;
 
-               } else if (display === 'clickFocus') {
-                   anchor
-                       .on(_pointerPrefix + 'down.popover', function() {
-                           event.preventDefault();
-                           event.stopPropagation();
-                       })
-                       .on(_pointerPrefix + 'up.popover', function() {
-                           event.preventDefault();
-                           event.stopPropagation();
-                       })
-                       .on('click.popover', toggle);
+         var _source;
 
-                   popoverSelection
-                       .attr('tabindex', 0)
-                       .on('blur.popover', function() {
-                           anchor.each(function() {
-                               hide.apply(this, arguments);
-                           });
-                       });
-               }
-           }
+         function tileSizeAtZoom(d, z) {
+           var EPSILON = 0.002; // close seams
 
+           return _tileSize * Math.pow(2, z - d[2]) / _tileSize + EPSILON;
+         }
 
-           function show() {
-               var anchor = select(this);
-               var popoverSelection = anchor.selectAll('.popover-' + _id);
+         function atZoom(t, distance) {
+           var power = Math.pow(2, distance);
+           return [Math.floor(t[0] * power), Math.floor(t[1] * power), t[2] + distance];
+         }
 
-               if (popoverSelection.empty()) {
-                   // popover was removed somehow, put it back
-                   anchor.call(popover.destroy);
-                   anchor.each(setup);
-                   popoverSelection = anchor.selectAll('.popover-' + _id);
-               }
+         function lookUp(d) {
+           for (var up = -1; up > -d[2]; up--) {
+             var tile = atZoom(d, up);
 
-               popoverSelection.classed('in', true);
+             if (_cache[_source.url(tile)] !== false) {
+               return tile;
+             }
+           }
+         }
 
-               var displayType = _displayType.apply(this, arguments);
-               if (displayType === 'clickFocus') {
-                   anchor.classed('active', true);
-                   popoverSelection.node().focus();
-               }
+         function uniqueBy(a, n) {
+           var o = [];
+           var seen = {};
 
-               anchor.each(updateContent);
+           for (var i = 0; i < a.length; i++) {
+             if (seen[a[i][n]] === undefined) {
+               o.push(a[i]);
+               seen[a[i][n]] = true;
+             }
            }
 
-           function updateContent() {
-               var anchor = select(this);
+           return o;
+         }
 
-               if (_content) {
-                   anchor.selectAll('.popover-' + _id + ' > .popover-inner')
-                       .call(_content.apply(this, arguments));
-               }
+         function addSource(d) {
+           d.push(_source.url(d));
+           return d;
+         } // Update tiles based on current state of `projection`.
 
-               updatePosition.apply(this, arguments);
-               // hack: update multiple times to fix instances where the absolute offset is
-               // set before the dynamic popover size is calculated by the browser
-               updatePosition.apply(this, arguments);
-               updatePosition.apply(this, arguments);
+
+         function background(selection) {
+           _zoom = geoScaleToZoom(_projection.scale(), _tileSize);
+           var pixelOffset;
+
+           if (_source) {
+             pixelOffset = [_source.offset()[0] * Math.pow(2, _zoom), _source.offset()[1] * Math.pow(2, _zoom)];
+           } else {
+             pixelOffset = [0, 0];
            }
 
+           var translate = [_projection.translate()[0] + pixelOffset[0], _projection.translate()[1] + pixelOffset[1]];
+           tiler.scale(_projection.scale() * 2 * Math.PI).translate(translate);
+           _tileOrigin = [_projection.scale() * Math.PI - translate[0], _projection.scale() * Math.PI - translate[1]];
+           render(selection);
+         } // Derive the tiles onscreen, remove those offscreen and position them.
+         // Important that this part not depend on `_projection` because it's
+         // rentered when tiles load/error (see #644).
 
-           function updatePosition() {
 
-               var anchor = select(this);
-               var popoverSelection = anchor.selectAll('.popover-' + _id);
+         function render(selection) {
+           if (!_source) return;
+           var requests = [];
+           var showDebug = context.getDebug('tile') && !_source.overlay;
 
-               var scrollContainer = _scrollContainer && _scrollContainer.apply(this, arguments);
-               var scrollNode = scrollContainer && !scrollContainer.empty() && scrollContainer.node();
-               var scrollLeft = scrollNode ? scrollNode.scrollLeft : 0;
-               var scrollTop = scrollNode ? scrollNode.scrollTop : 0;
+           if (_source.validZoom(_zoom)) {
+             tiler.skipNullIsland(!!_source.overlay);
+             tiler().forEach(function (d) {
+               addSource(d);
+               if (d[3] === '') return;
+               if (typeof d[3] !== 'string') return; // Workaround for #2295
 
-               var placement = _placement.apply(this, arguments);
-               popoverSelection
-                   .classed('left', false)
-                   .classed('right', false)
-                   .classed('top', false)
-                   .classed('bottom', false)
-                   .classed(placement, true);
+               requests.push(d);
 
-               var alignment = _alignment.apply(this, arguments);
-               var alignFactor = 0.5;
-               if (alignment === 'leading') {
-                   alignFactor = 0;
-               } else if (alignment === 'trailing') {
-                   alignFactor = 1;
+               if (_cache[d[3]] === false && lookUp(d)) {
+                 requests.push(addSource(lookUp(d)));
                }
-               var anchorFrame = getFrame(anchor.node());
-               var popoverFrame = getFrame(popoverSelection.node());
-               var position;
+             });
+             requests = uniqueBy(requests, 3).filter(function (r) {
+               // don't re-request tiles which have failed in the past
+               return _cache[r[3]] !== false;
+             });
+           }
 
-               switch (placement) {
-                   case 'top':
-                   position = {
-                       x: anchorFrame.x + (anchorFrame.w - popoverFrame.w) * alignFactor,
-                       y: anchorFrame.y - popoverFrame.h
-                   };
-                   break;
-                   case 'bottom':
-                   position = {
-                       x: anchorFrame.x + (anchorFrame.w - popoverFrame.w) * alignFactor,
-                       y: anchorFrame.y + anchorFrame.h
-                   };
-                   break;
-                   case 'left':
-                   position = {
-                       x: anchorFrame.x - popoverFrame.w,
-                       y: anchorFrame.y + (anchorFrame.h - popoverFrame.h) * alignFactor
-                   };
-                   break;
-                   case 'right':
-                   position = {
-                       x: anchorFrame.x + anchorFrame.w,
-                       y: anchorFrame.y + (anchorFrame.h - popoverFrame.h) * alignFactor
-                   };
-                   break;
-               }
+           function load(d3_event, d) {
+             _cache[d[3]] = true;
+             select(this).on('error', null).on('load', null).classed('tile-loaded', true);
+             render(selection);
+           }
 
-               if (position) {
+           function error(d3_event, d) {
+             _cache[d[3]] = false;
+             select(this).on('error', null).on('load', null).remove();
+             render(selection);
+           }
 
-                   if (scrollNode && (placement === 'top' || placement === 'bottom')) {
+           function imageTransform(d) {
+             var ts = _tileSize * Math.pow(2, _zoom - d[2]);
 
-                       var initialPosX = position.x;
+             var scale = tileSizeAtZoom(d, _zoom);
+             return 'translate(' + (d[0] * ts - _tileOrigin[0]) + 'px,' + (d[1] * ts - _tileOrigin[1]) + 'px) ' + 'scale(' + scale + ',' + scale + ')';
+           }
 
-                       if (position.x + popoverFrame.w > scrollNode.offsetWidth - 10) {
-                           position.x = scrollNode.offsetWidth - 10 - popoverFrame.w;
-                       } else if (position.x < 10) {
-                           position.x = 10;
-                       }
+           function tileCenter(d) {
+             var ts = _tileSize * Math.pow(2, _zoom - d[2]);
 
-                       var arrow = anchor.selectAll('.popover-' + _id + ' > .popover-arrow');
-                       // keep the arrow centered on the button, or as close as possible
-                       var arrowPosX = Math.min(Math.max(popoverFrame.w / 2 - (position.x - initialPosX), 10), popoverFrame.w - 10);
-                       arrow.style('left', ~~arrowPosX + 'px');
-                   }
+             return [d[0] * ts - _tileOrigin[0] + ts / 2, d[1] * ts - _tileOrigin[1] + ts / 2];
+           }
 
-                   popoverSelection.style('left', ~~position.x + 'px').style('top', ~~position.y + 'px');
-               } else {
-                   popoverSelection.style('left', null).style('top', null);
-               }
+           function debugTransform(d) {
+             var coord = tileCenter(d);
+             return 'translate(' + coord[0] + 'px,' + coord[1] + 'px)';
+           } // Pick a representative tile near the center of the viewport
+           // (This is useful for sampling the imagery vintage)
 
-               function getFrame(node) {
-                   var positionStyle = select(node).style('position');
-                   if (positionStyle === 'absolute' || positionStyle === 'static') {
-                       return {
-                           x: node.offsetLeft - scrollLeft,
-                           y: node.offsetTop - scrollTop,
-                           w: node.offsetWidth,
-                           h: node.offsetHeight
-                       };
-                   } else {
-                       return {
-                           x: 0,
-                           y: 0,
-                           w: node.offsetWidth,
-                           h: node.offsetHeight
-                       };
-                   }
-               }
-           }
 
+           var dims = tiler.size();
+           var mapCenter = [dims[0] / 2, dims[1] / 2];
+           var minDist = Math.max(dims[0], dims[1]);
+           var nearCenter;
+           requests.forEach(function (d) {
+             var c = tileCenter(d);
+             var dist = geoVecLength(c, mapCenter);
 
-           function hide() {
-               var anchor = select(this);
-               if (_displayType.apply(this, arguments) === 'clickFocus') {
-                   anchor.classed('active', false);
+             if (dist < minDist) {
+               minDist = dist;
+               nearCenter = d;
+             }
+           });
+           var image = selection.selectAll('img').data(requests, function (d) {
+             return d[3];
+           });
+           image.exit().style(transformProp, imageTransform).classed('tile-removing', true).classed('tile-center', false).each(function () {
+             var tile = select(this);
+             window.setTimeout(function () {
+               if (tile.classed('tile-removing')) {
+                 tile.remove();
                }
-               anchor.selectAll('.popover-' + _id).classed('in', false);
+             }, 300);
+           });
+           image.enter().append('img').attr('class', 'tile').attr('draggable', 'false').style('width', _tileSize + 'px').style('height', _tileSize + 'px').attr('src', function (d) {
+             return d[3];
+           }).on('error', error).on('load', load).merge(image).style(transformProp, imageTransform).classed('tile-debug', showDebug).classed('tile-removing', false).classed('tile-center', function (d) {
+             return d === nearCenter;
+           });
+           var debug = selection.selectAll('.tile-label-debug').data(showDebug ? requests : [], function (d) {
+             return d[3];
+           });
+           debug.exit().remove();
+
+           if (showDebug) {
+             var debugEnter = debug.enter().append('div').attr('class', 'tile-label-debug');
+             debugEnter.append('div').attr('class', 'tile-label-debug-coord');
+             debugEnter.append('div').attr('class', 'tile-label-debug-vintage');
+             debug = debug.merge(debugEnter);
+             debug.style(transformProp, debugTransform);
+             debug.selectAll('.tile-label-debug-coord').html(function (d) {
+               return d[2] + ' / ' + d[0] + ' / ' + d[1];
+             });
+             debug.selectAll('.tile-label-debug-vintage').each(function (d) {
+               var span = select(this);
+               var center = context.projection.invert(tileCenter(d));
+
+               _source.getMetadata(center, d, function (err, result) {
+                 span.html(result && result.vintage && result.vintage.range || _t('info_panels.background.vintage') + ': ' + _t('info_panels.background.unknown'));
+               });
+             });
            }
+         }
 
+         background.projection = function (val) {
+           if (!arguments.length) return _projection;
+           _projection = val;
+           return background;
+         };
 
-           function toggle() {
-               if (select(this).select('.popover-' + _id).classed('in')) {
-                   hide.apply(this, arguments);
-               } else {
-                   show.apply(this, arguments);
-               }
-           }
+         background.dimensions = function (val) {
+           if (!arguments.length) return tiler.size();
+           tiler.size(val);
+           return background;
+         };
 
+         background.source = function (val) {
+           if (!arguments.length) return _source;
+           _source = val;
+           _tileSize = _source.tileSize;
+           _cache = {};
+           tiler.tileSize(_source.tileSize).zoomExtent(_source.zoomExtent);
+           return background;
+         };
 
-           return popover;
+         return background;
        }
 
-       function uiTooltip(klass) {
-
-           var tooltip = uiPopover((klass || '') + ' tooltip')
-               .displayType('hover');
+       var _imageryIndex = null;
+       function rendererBackground(context) {
+         var dispatch$1 = dispatch('change');
+         var detected = utilDetect();
+         var baseLayer = rendererTileLayer(context).projection(context.projection);
+         var _isValid = true;
+         var _overlayLayers = [];
+         var _brightness = 1;
+         var _contrast = 1;
+         var _saturation = 1;
+         var _sharpness = 1;
 
-           var _title = function() {
-               var title = this.getAttribute('data-original-title');
-               if (title) {
-                   return title;
+         function ensureImageryIndex() {
+           return _mainFileFetcher.get('imagery').then(function (sources) {
+             if (_imageryIndex) return _imageryIndex;
+             _imageryIndex = {
+               imagery: sources,
+               features: {}
+             }; // use which-polygon to support efficient index and querying for imagery
+
+             var features = sources.map(function (source) {
+               if (!source.polygon) return null; // workaround for editor-layer-index weirdness..
+               // Add an extra array nest to each element in `source.polygon`
+               // so the rings are not treated as a bunch of holes:
+               // what we have: [ [[outer],[hole],[hole]] ]
+               // what we want: [ [[outer]],[[outer]],[[outer]] ]
+
+               var rings = source.polygon.map(function (ring) {
+                 return [ring];
+               });
+               var feature = {
+                 type: 'Feature',
+                 properties: {
+                   id: source.id
+                 },
+                 geometry: {
+                   type: 'MultiPolygon',
+                   coordinates: rings
+                 }
+               };
+               _imageryIndex.features[source.id] = feature;
+               return feature;
+             }).filter(Boolean);
+             _imageryIndex.query = whichPolygon_1({
+               type: 'FeatureCollection',
+               features: features
+             }); // Instantiate `rendererBackgroundSource` objects for each source
+
+             _imageryIndex.backgrounds = sources.map(function (source) {
+               if (source.type === 'bing') {
+                 return rendererBackgroundSource.Bing(source, dispatch$1);
+               } else if (/^EsriWorldImagery/.test(source.id)) {
+                 return rendererBackgroundSource.Esri(source);
                } else {
-                   title = this.getAttribute('title');
-                   this.removeAttribute('title');
-                   this.setAttribute('data-original-title', title);
+                 return rendererBackgroundSource(source);
                }
-               return title;
-           };
-
-           var _heading = utilFunctor(null);
-           var _keys = utilFunctor(null);
+             }); // Add 'None'
 
-           tooltip.title = function(val) {
-               if (!arguments.length) return _title;
-               _title = utilFunctor(val);
-               return tooltip;
-           };
+             _imageryIndex.backgrounds.unshift(rendererBackgroundSource.None()); // Add 'Custom'
 
-           tooltip.heading = function(val) {
-               if (!arguments.length) return _heading;
-               _heading = utilFunctor(val);
-               return tooltip;
-           };
 
-           tooltip.keys = function(val) {
-               if (!arguments.length) return _keys;
-               _keys = utilFunctor(val);
-               return tooltip;
-           };
+             var template = corePreferences('background-custom-template') || '';
+             var custom = rendererBackgroundSource.Custom(template);
 
-           tooltip.content(function() {
-               var heading = _heading.apply(this, arguments);
-               var text = _title.apply(this, arguments);
-               var keys = _keys.apply(this, arguments);
+             _imageryIndex.backgrounds.unshift(custom);
 
-               return function(selection) {
+             return _imageryIndex;
+           });
+         }
 
-                   var headingSelect = selection
-                       .selectAll('.tooltip-heading')
-                       .data(heading ? [heading] :[]);
+         function background(selection) {
+           var currSource = baseLayer.source(); // If we are displaying an Esri basemap at high zoom,
+           // check its tilemap to see how high the zoom can go
 
-                   headingSelect.exit()
-                       .remove();
+           if (context.map().zoom() > 18) {
+             if (currSource && /^EsriWorldImagery/.test(currSource.id)) {
+               var center = context.map().center();
+               currSource.fetchTilemap(center);
+             }
+           } // Is the imagery valid here? - #4827
 
-                   headingSelect.enter()
-                       .append('div')
-                       .attr('class', 'tooltip-heading')
-                       .merge(headingSelect)
-                       .html(heading);
 
-                   var textSelect = selection
-                       .selectAll('.tooltip-text')
-                       .data(text ? [text] :[]);
+           var sources = background.sources(context.map().extent());
+           var wasValid = _isValid;
+           _isValid = !!sources.filter(function (d) {
+             return d === currSource;
+           }).length;
 
-                   textSelect.exit()
-                       .remove();
+           if (wasValid !== _isValid) {
+             // change in valid status
+             background.updateImagery();
+           }
 
-                   textSelect.enter()
-                       .append('div')
-                       .attr('class', 'tooltip-text')
-                       .merge(textSelect)
-                       .html(text);
+           var baseFilter = '';
 
-                   var keyhintWrap = selection
-                       .selectAll('.keyhint-wrap')
-                       .data(keys && keys.length ? [0] : []);
+           if (detected.cssfilters) {
+             if (_brightness !== 1) {
+               baseFilter += " brightness(".concat(_brightness, ")");
+             }
 
-                   keyhintWrap.exit()
-                       .remove();
+             if (_contrast !== 1) {
+               baseFilter += " contrast(".concat(_contrast, ")");
+             }
 
-                   var keyhintWrapEnter = keyhintWrap.enter()
-                       .append('div')
-                       .attr('class', 'keyhint-wrap');
+             if (_saturation !== 1) {
+               baseFilter += " saturate(".concat(_saturation, ")");
+             }
 
-                   keyhintWrapEnter
-                       .append('span')
-                       .html(_t('tooltip_keyhint'));
+             if (_sharpness < 1) {
+               // gaussian blur
+               var blur = d3_interpolateNumber(0.5, 5)(1 - _sharpness);
+               baseFilter += " blur(".concat(blur, "px)");
+             }
+           }
 
-                   keyhintWrap = keyhintWrapEnter.merge(keyhintWrap);
+           var base = selection.selectAll('.layer-background').data([0]);
+           base = base.enter().insert('div', '.layer-data').attr('class', 'layer layer-background').merge(base);
 
-                   keyhintWrap.selectAll('kbd.shortcut')
-                       .data(keys && keys.length ? keys : [])
-                       .enter()
-                       .append('kbd')
-                       .attr('class', 'shortcut')
-                       .html(function(d) {
-                           return d;
-                       });
-               };
-           });
+           if (detected.cssfilters) {
+             base.style('filter', baseFilter || null);
+           } else {
+             base.style('opacity', _brightness);
+           }
 
-           return tooltip;
-       }
+           var imagery = base.selectAll('.layer-imagery').data([0]);
+           imagery.enter().append('div').attr('class', 'layer layer-imagery').merge(imagery).call(baseLayer);
+           var maskFilter = '';
+           var mixBlendMode = '';
 
-       function uiEditMenu(context) {
-           var dispatch$1 = dispatch('toggled');
+           if (detected.cssfilters && _sharpness > 1) {
+             // apply unsharp mask
+             mixBlendMode = 'overlay';
+             maskFilter = 'saturate(0) blur(3px) invert(1)';
+             var contrast = _sharpness - 1;
+             maskFilter += " contrast(".concat(contrast, ")");
+             var brightness = d3_interpolateNumber(1, 0.85)(_sharpness - 1);
+             maskFilter += " brightness(".concat(brightness, ")");
+           }
 
-           var _menu = select(null);
-           var _operations = [];
-           // the position the menu should be displayed relative to
-           var _anchorLoc = [0, 0];
-           var _anchorLocLonLat = [0, 0];
-           // a string indicating how the menu was opened
-           var _triggerType = '';
+           var mask = base.selectAll('.layer-unsharp-mask').data(detected.cssfilters && _sharpness > 1 ? [0] : []);
+           mask.exit().remove();
+           mask.enter().append('div').attr('class', 'layer layer-mask layer-unsharp-mask').merge(mask).call(baseLayer).style('filter', maskFilter || null).style('mix-blend-mode', mixBlendMode || null);
+           var overlays = selection.selectAll('.layer-overlay').data(_overlayLayers, function (d) {
+             return d.source().name();
+           });
+           overlays.exit().remove();
+           overlays.enter().insert('div', '.layer-data').attr('class', 'layer layer-overlay').merge(overlays).each(function (layer, i, nodes) {
+             return select(nodes[i]).call(layer);
+           });
+         }
 
-           var _vpTopMargin = 85; // viewport top margin
-           var _vpBottomMargin = 45; // viewport bottom margin
-           var _vpSideMargin = 35;   // viewport side margin
+         background.updateImagery = function () {
+           var currSource = baseLayer.source();
+           if (context.inIntro() || !currSource) return;
 
-           var _menuTop = false;
-           var _menuHeight;
-           var _menuWidth;
+           var o = _overlayLayers.filter(function (d) {
+             return !d.source().isLocatorOverlay() && !d.source().isHidden();
+           }).map(function (d) {
+             return d.source().id;
+           }).join(',');
 
-           // hardcode these values to make menu positioning easier
-           var _verticalPadding = 4;
+           var meters = geoOffsetToMeters(currSource.offset());
+           var EPSILON = 0.01;
+           var x = +meters[0].toFixed(2);
+           var y = +meters[1].toFixed(2);
+           var hash = utilStringQs(window.location.hash);
+           var id = currSource.id;
 
-           // see also `.edit-menu .tooltip` CSS; include margin
-           var _tooltipWidth = 210;
+           if (id === 'custom') {
+             id = "custom:".concat(currSource.template());
+           }
 
-           // offset the menu slightly from the target location
-           var _menuSideMargin = 10;
+           if (id) {
+             hash.background = id;
+           } else {
+             delete hash.background;
+           }
 
-           var _tooltips = [];
+           if (o) {
+             hash.overlays = o;
+           } else {
+             delete hash.overlays;
+           }
 
-           var editMenu = function(selection) {
+           if (Math.abs(x) > EPSILON || Math.abs(y) > EPSILON) {
+             hash.offset = "".concat(x, ",").concat(y);
+           } else {
+             delete hash.offset;
+           }
 
-               var isTouchMenu = _triggerType.includes('touch') || _triggerType.includes('pen');
+           if (!window.mocha) {
+             window.location.replace('#' + utilQsString(hash, true));
+           }
 
-               var ops = _operations.filter(function(op) {
-                   return !isTouchMenu || !op.mouseOnly;
-               });
+           var imageryUsed = [];
+           var photoOverlaysUsed = [];
+           var currUsed = currSource.imageryUsed();
 
-               if (!ops.length) return;
+           if (currUsed && _isValid) {
+             imageryUsed.push(currUsed);
+           }
 
-               _tooltips = [];
+           _overlayLayers.filter(function (d) {
+             return !d.source().isLocatorOverlay() && !d.source().isHidden();
+           }).forEach(function (d) {
+             return imageryUsed.push(d.source().imageryUsed());
+           });
 
-               // Position the menu above the anchor for stylus and finger input
-               // since the mapper's hand likely obscures the screen below the anchor
-               _menuTop = isTouchMenu;
+           var dataLayer = context.layers().layer('data');
 
-               // Show labels for touch input since there aren't hover tooltips
-               var showLabels = isTouchMenu;
+           if (dataLayer && dataLayer.enabled() && dataLayer.hasData()) {
+             imageryUsed.push(dataLayer.getSrc());
+           }
 
-               var buttonHeight = showLabels ? 32 : 34;
-               if (showLabels) {
-                   // Get a general idea of the width based on the length of the label
-                   _menuWidth = 52 + Math.min(120, 6 * Math.max.apply(Math, ops.map(function(op) {
-                       return op.title.length;
-                   })));
-               } else {
-                   _menuWidth = 44;
-               }
+           var photoOverlayLayers = {
+             streetside: 'Bing Streetside',
+             mapillary: 'Mapillary Images',
+             'mapillary-map-features': 'Mapillary Map Features',
+             'mapillary-signs': 'Mapillary Signs',
+             openstreetcam: 'OpenStreetCam Images'
+           };
 
-               _menuHeight = _verticalPadding * 2 + ops.length * buttonHeight;
+           for (var layerID in photoOverlayLayers) {
+             var layer = context.layers().layer(layerID);
 
-               _menu = selection
-                   .append('div')
-                   .attr('class', 'edit-menu')
-                   .classed('touch-menu', isTouchMenu)
-                   .style('padding', _verticalPadding + 'px 0');
-
-               var buttons = _menu.selectAll('.edit-menu-item')
-                   .data(ops);
-
-               // enter
-               var buttonsEnter = buttons.enter()
-                   .append('button')
-                   .attr('class', function (d) { return 'edit-menu-item edit-menu-item-' + d.id; })
-                   .style('height', buttonHeight + 'px')
-                   .on('click', click)
-                   // don't listen for `mouseup` because we only care about non-mouse pointer types
-                   .on('pointerup', pointerup)
-                   .on('pointerdown mousedown', function pointerdown() {
-                       // don't let button presses also act as map input - #1869
-                       event.stopPropagation();
-                   });
+             if (layer && layer.enabled()) {
+               photoOverlaysUsed.push(layerID);
+               imageryUsed.push(photoOverlayLayers[layerID]);
+             }
+           }
 
-               buttonsEnter.each(function(d) {
-                   var tooltip = uiTooltip()
-                       .heading(d.title)
-                       .title(d.tooltip())
-                       .keys([d.keys[0]]);
+           context.history().imageryUsed(imageryUsed);
+           context.history().photoOverlaysUsed(photoOverlaysUsed);
+         };
 
-                   _tooltips.push(tooltip);
+         var _checkedBlocklists;
 
-                   select(this)
-                       .call(tooltip)
-                       .append('div')
-                       .attr('class', 'icon-wrap')
-                       .call(svgIcon('#iD-operation-' + d.id, 'operation'));
-               });
+         background.sources = function (extent, zoom, includeCurrent) {
+           if (!_imageryIndex) return []; // called before init()?
 
-               if (showLabels) {
-                   buttonsEnter.append('span')
-                       .attr('class', 'label')
-                       .text(function(d) {
-                           return d.title;
-                       });
-               }
+           var visible = {};
+           (_imageryIndex.query.bbox(extent.rectangle(), true) || []).forEach(function (d) {
+             return visible[d.id] = true;
+           });
+           var currSource = baseLayer.source();
+           var osm = context.connection();
+           var blocklists = osm && osm.imageryBlocklists();
 
-               // update
-               buttons = buttonsEnter
-                   .merge(buttons)
-                   .classed('disabled', function(d) { return d.disabled(); });
+           if (blocklists && blocklists !== _checkedBlocklists) {
+             _imageryIndex.backgrounds.forEach(function (source) {
+               source.isBlocked = blocklists.some(function (blocklist) {
+                 return blocklist.test(source.template());
+               });
+             });
 
-               updatePosition();
+             _checkedBlocklists = blocklists;
+           }
 
-               var initialScale = context.projection.scale();
-               context.map()
-                   .on('move.edit-menu', function() {
-                       if (initialScale !== context.projection.scale()) {
-                           editMenu.close();
-                       }
-                   })
-                   .on('drawn.edit-menu', function(info) {
-                       if (info.full) updatePosition();
-                   });
+           return _imageryIndex.backgrounds.filter(function (source) {
+             if (includeCurrent && currSource === source) return true; // optionally always include the current imagery
 
-               var lastPointerUpType;
-               // `pointerup` is always called before `click`
-               function pointerup() {
-                   lastPointerUpType = event.pointerType;
-               }
-
-               function click(operation) {
-                   event.stopPropagation();
-                   if (operation.disabled()) {
-                       if (lastPointerUpType === 'touch' ||
-                           lastPointerUpType === 'pen') {
-                           // there are no tooltips for touch interactions so flash feedback instead
-                           context.ui().flash
-                               .duration(4000)
-                               .iconName('#iD-operation-' + operation.id)
-                               .iconClass('operation disabled')
-                               .text(operation.tooltip)();
-                       }
-                   } else {
-                       if (lastPointerUpType === 'touch' ||
-                           lastPointerUpType === 'pen') {
-                           context.ui().flash
-                               .duration(2000)
-                               .iconName('#iD-operation-' + operation.id)
-                               .iconClass('operation')
-                               .text(operation.annotation() || operation.title)();
-                       }
+             if (source.isBlocked) return false; // even bundled sources may be blocked - #7905
 
-                       operation();
-                       editMenu.close();
-                   }
-                   lastPointerUpType = null;
-               }
+             if (!source.polygon) return true; // always include imagery with worldwide coverage
 
-               dispatch$1.call('toggled', this, true);
-           };
+             if (zoom && zoom < 6) return false; // optionally exclude local imagery at low zooms
 
-           function updatePosition() {
+             return visible[source.id]; // include imagery visible in given extent
+           });
+         };
 
-               if (!_menu || _menu.empty()) return;
+         background.dimensions = function (val) {
+           if (!val) return;
+           baseLayer.dimensions(val);
 
-               var anchorLoc = context.projection(_anchorLocLonLat);
+           _overlayLayers.forEach(function (layer) {
+             return layer.dimensions(val);
+           });
+         };
 
-               var viewport = context.surfaceRect();
+         background.baseLayerSource = function (d) {
+           if (!arguments.length) return baseLayer.source(); // test source against OSM imagery blocklists..
 
-               if (anchorLoc[0] < 0 ||
-                   anchorLoc[0] > viewport.width ||
-                   anchorLoc[1] < 0 ||
-                   anchorLoc[1] > viewport.height) {
-                   // close the menu if it's gone offscreen
+           var osm = context.connection();
+           if (!osm) return background;
+           var blocklists = osm.imageryBlocklists();
+           var template = d.template();
+           var fail = false;
+           var tested = 0;
+           var regex;
+
+           for (var i = 0; i < blocklists.length; i++) {
+             regex = blocklists[i];
+             fail = regex.test(template);
+             tested++;
+             if (fail) break;
+           } // ensure at least one test was run.
 
-                   editMenu.close();
-                   return;
-               }
 
-               var menuLeft = displayOnLeft(viewport);
+           if (!tested) {
+             regex = /.*\.google(apis)?\..*\/(vt|kh)[\?\/].*([xyz]=.*){3}.*/;
+             fail = regex.test(template);
+           }
 
-               var offset = [0, 0];
+           baseLayer.source(!fail ? d : background.findSource('none'));
+           dispatch$1.call('change');
+           background.updateImagery();
+           return background;
+         };
 
-               offset[0] = menuLeft ? -1 * (_menuSideMargin + _menuWidth) : _menuSideMargin;
+         background.findSource = function (id) {
+           if (!id || !_imageryIndex) return null; // called before init()?
 
-               if (_menuTop) {
-                   if (anchorLoc[1] - _menuHeight < _vpTopMargin) {
-                       // menu is near top viewport edge, shift downward
-                       offset[1] = -anchorLoc[1] + _vpTopMargin;
-                   } else {
-                       offset[1] = -_menuHeight;
-                   }
-               } else {
-                   if (anchorLoc[1] + _menuHeight > (viewport.height - _vpBottomMargin)) {
-                       // menu is near bottom viewport edge, shift upwards
-                       offset[1] = -anchorLoc[1] - _menuHeight + viewport.height - _vpBottomMargin;
-                   } else {
-                       offset[1] = 0;
-                   }
-               }
+           return _imageryIndex.backgrounds.find(function (d) {
+             return d.id && d.id === id;
+           });
+         };
 
-               var origin = geoVecAdd(anchorLoc, offset);
+         background.bing = function () {
+           background.baseLayerSource(background.findSource('Bing'));
+         };
 
-               _menu
-                   .style('left', origin[0] + 'px')
-                   .style('top', origin[1] + 'px');
+         background.showsLayer = function (d) {
+           var currSource = baseLayer.source();
+           if (!d || !currSource) return false;
+           return d.id === currSource.id || _overlayLayers.some(function (layer) {
+             return d.id === layer.source().id;
+           });
+         };
 
-               var tooltipSide = tooltipPosition(viewport, menuLeft);
-               _tooltips.forEach(function(tooltip) {
-                   tooltip.placement(tooltipSide);
-               });
+         background.overlayLayerSources = function () {
+           return _overlayLayers.map(function (layer) {
+             return layer.source();
+           });
+         };
 
-               function displayOnLeft(viewport) {
-                   if (_mainLocalizer.textDirection() === 'ltr') {
-                       if ((anchorLoc[0] + _menuSideMargin + _menuWidth) > (viewport.width - _vpSideMargin)) {
-                           // right menu would be too close to the right viewport edge, go left
-                           return true;
-                       }
-                       // prefer right menu
-                       return false;
+         background.toggleOverlayLayer = function (d) {
+           var layer;
 
-                   } else { // rtl
-                       if ((anchorLoc[0] - _menuSideMargin - _menuWidth) < _vpSideMargin) {
-                           // left menu would be too close to the left viewport edge, go right
-                           return false;
-                       }
-                       // prefer left menu
-                       return true;
-                   }
-               }
+           for (var i = 0; i < _overlayLayers.length; i++) {
+             layer = _overlayLayers[i];
 
-               function tooltipPosition(viewport, menuLeft) {
-                   if (_mainLocalizer.textDirection() === 'ltr') {
-                       if (menuLeft) {
-                           // if there's not room for a right-side menu then there definitely
-                           // isn't room for right-side tooltips
-                           return 'left';
-                       }
-                       if ((anchorLoc[0] + _menuSideMargin + _menuWidth + _tooltipWidth) > (viewport.width - _vpSideMargin)) {
-                           // right tooltips would be too close to the right viewport edge, go left
-                           return 'left';
-                       }
-                       // prefer right tooltips
-                       return 'right';
+             if (layer.source() === d) {
+               _overlayLayers.splice(i, 1);
 
-                   } else { // rtl
-                       if (!menuLeft) {
-                           return 'right';
-                       }
-                       if ((anchorLoc[0] - _menuSideMargin - _menuWidth - _tooltipWidth) < _vpSideMargin) {
-                           // left tooltips would be too close to the left viewport edge, go right
-                           return 'right';
-                       }
-                       // prefer left tooltips
-                       return 'left';
-                   }
-               }
+               dispatch$1.call('change');
+               background.updateImagery();
+               return;
+             }
            }
 
-           editMenu.close = function () {
+           layer = rendererTileLayer(context).source(d).projection(context.projection).dimensions(baseLayer.dimensions());
 
-               context.map()
-                   .on('move.edit-menu', null)
-                   .on('drawn.edit-menu', null);
+           _overlayLayers.push(layer);
 
-               _menu.remove();
-               _tooltips = [];
+           dispatch$1.call('change');
+           background.updateImagery();
+         };
 
-               dispatch$1.call('toggled', this, false);
-           };
+         background.nudge = function (d, zoom) {
+           var currSource = baseLayer.source();
 
-           editMenu.anchorLoc = function(val) {
-               if (!arguments.length) return _anchorLoc;
-               _anchorLoc = val;
-               _anchorLocLonLat = context.projection.invert(_anchorLoc);
-               return editMenu;
-           };
+           if (currSource) {
+             currSource.nudge(d, zoom);
+             dispatch$1.call('change');
+             background.updateImagery();
+           }
 
-           editMenu.triggerType = function(val) {
-               if (!arguments.length) return _triggerType;
-               _triggerType = val;
-               return editMenu;
-           };
+           return background;
+         };
 
-           editMenu.operations = function(val) {
-               if (!arguments.length) return _operations;
-               _operations = val;
-               return editMenu;
-           };
+         background.offset = function (d) {
+           var currSource = baseLayer.source();
 
-           return utilRebind(editMenu, dispatch$1, 'on');
-       }
+           if (!arguments.length) {
+             return currSource && currSource.offset() || [0, 0];
+           }
 
-       function uiFeatureInfo(context) {
-           function update(selection) {
-               var features = context.features();
-               var stats = features.stats();
-               var count = 0;
-               var hiddenList = features.hidden().map(function(k) {
-                   if (stats[k]) {
-                       count += stats[k];
-                       return String(stats[k]) + ' ' + _t('feature.' + k + '.description');
-                   }
-               }).filter(Boolean);
+           if (currSource) {
+             currSource.offset(d);
+             dispatch$1.call('change');
+             background.updateImagery();
+           }
 
-               selection.html('');
+           return background;
+         };
 
-               if (hiddenList.length) {
-                   var tooltipBehavior = uiTooltip()
-                       .placement('top')
-                       .title(function() {
-                           return hiddenList.join('<br/>');
-                       });
+         background.brightness = function (d) {
+           if (!arguments.length) return _brightness;
+           _brightness = d;
+           if (context.mode()) dispatch$1.call('change');
+           return background;
+         };
 
-                   selection.append('a')
-                       .attr('class', 'chip')
-                       .attr('href', '#')
-                       .attr('tabindex', -1)
-                       .html(_t('feature_info.hidden_warning', { count: count }))
-                       .call(tooltipBehavior)
-                       .on('click', function() {
-                           tooltipBehavior.hide();
-                           event.preventDefault();
-                           // open the Map Data pane
-                           context.ui().togglePanes(context.container().select('.map-panes .map-data-pane'));
-                       });
-               }
+         background.contrast = function (d) {
+           if (!arguments.length) return _contrast;
+           _contrast = d;
+           if (context.mode()) dispatch$1.call('change');
+           return background;
+         };
 
-               selection
-                   .classed('hide', !hiddenList.length);
-           }
+         background.saturation = function (d) {
+           if (!arguments.length) return _saturation;
+           _saturation = d;
+           if (context.mode()) dispatch$1.call('change');
+           return background;
+         };
 
+         background.sharpness = function (d) {
+           if (!arguments.length) return _sharpness;
+           _sharpness = d;
+           if (context.mode()) dispatch$1.call('change');
+           return background;
+         };
 
-           return function(selection) {
-               update(selection);
+         var _loadPromise;
 
-               context.features().on('change.feature_info', function() {
-                   update(selection);
-               });
-           };
-       }
+         background.ensureLoaded = function () {
+           if (_loadPromise) return _loadPromise;
 
-       function uiFlash(context) {
-           var _flashTimer;
+           function parseMapParams(qmap) {
+             if (!qmap) return false;
+             var params = qmap.split('/').map(Number);
+             if (params.length < 3 || params.some(isNaN)) return false;
+             return geoExtent([params[2], params[1]]); // lon,lat
+           }
 
-           var _duration = 2000;
-           var _iconName = '#iD-icon-no';
-           var _iconClass = 'disabled';
-           var _text = '';
-           var _textClass;
+           var hash = utilStringQs(window.location.hash);
+           var requested = hash.background || hash.layer;
+           var extent = parseMapParams(hash.map);
+           return _loadPromise = ensureImageryIndex().then(function (imageryIndex) {
+             var first = imageryIndex.backgrounds.length && imageryIndex.backgrounds[0];
+             var best;
 
-           function flash() {
-               if (_flashTimer) {
-                   _flashTimer.stop();
-               }
+             if (!requested && extent) {
+               best = background.sources(extent).find(function (s) {
+                 return s.best();
+               });
+             } // Decide which background layer to display
 
-               context.container().select('.main-footer-wrap')
-                   .classed('footer-hide', true)
-                   .classed('footer-show', false);
-               context.container().select('.flash-wrap')
-                   .classed('footer-hide', false)
-                   .classed('footer-show', true);
 
-               var content = context.container().select('.flash-wrap').selectAll('.flash-content')
-                   .data([0]);
+             if (requested && requested.indexOf('custom:') === 0) {
+               var template = requested.replace(/^custom:/, '');
+               var custom = background.findSource('custom');
+               background.baseLayerSource(custom.template(template));
+               corePreferences('background-custom-template', template);
+             } else {
+               background.baseLayerSource(background.findSource(requested) || best || background.findSource(corePreferences('background-last-used')) || background.findSource('Bing') || first || background.findSource('none'));
+             }
 
-               // Enter
-               var contentEnter = content.enter()
-                   .append('div')
-                   .attr('class', 'flash-content');
+             var locator = imageryIndex.backgrounds.find(function (d) {
+               return d.overlay && d["default"];
+             });
 
-               var iconEnter = contentEnter
-                   .append('svg')
-                   .attr('class', 'flash-icon icon')
-                   .append('g')
-                   .attr('transform', 'translate(10,10)');
+             if (locator) {
+               background.toggleOverlayLayer(locator);
+             }
 
-               iconEnter
-                   .append('circle')
-                   .attr('r', 9);
+             var overlays = (hash.overlays || '').split(',');
+             overlays.forEach(function (overlay) {
+               overlay = background.findSource(overlay);
 
-               iconEnter
-                   .append('use')
-                   .attr('transform', 'translate(-7,-7)')
-                   .attr('width', '14')
-                   .attr('height', '14');
+               if (overlay) {
+                 background.toggleOverlayLayer(overlay);
+               }
+             });
 
-               contentEnter
-                   .append('div')
-                   .attr('class', 'flash-text');
+             if (hash.gpx) {
+               var gpx = context.layers().layer('data');
 
+               if (gpx) {
+                 gpx.url(hash.gpx, '.gpx');
+               }
+             }
 
-               // Update
-               content = content
-                   .merge(contentEnter);
+             if (hash.offset) {
+               var offset = hash.offset.replace(/;/g, ',').split(',').map(function (n) {
+                 return !isNaN(n) && n;
+               });
 
-               content
-                   .selectAll('.flash-icon')
-                   .attr('class', 'icon flash-icon ' + (_iconClass || ''));
+               if (offset.length === 2) {
+                 background.offset(geoMetersToOffset(offset));
+               }
+             }
+           })["catch"](function () {
+             /* ignore */
+           });
+         };
 
-               content
-                   .selectAll('.flash-icon use')
-                   .attr('xlink:href', _iconName);
+         return utilRebind(background, dispatch$1, 'on');
+       }
 
-               content
-                   .selectAll('.flash-text')
-                   .attr('class', 'flash-text ' + (_textClass || ''))
-                   .text(_text);
+       function rendererFeatures(context) {
+         var dispatch$1 = dispatch('change', 'redraw');
+         var features = utilRebind({}, dispatch$1, 'on');
+
+         var _deferred = new Set();
+
+         var traffic_roads = {
+           'motorway': true,
+           'motorway_link': true,
+           'trunk': true,
+           'trunk_link': true,
+           'primary': true,
+           'primary_link': true,
+           'secondary': true,
+           'secondary_link': true,
+           'tertiary': true,
+           'tertiary_link': true,
+           'residential': true,
+           'unclassified': true,
+           'living_street': true
+         };
+         var service_roads = {
+           'service': true,
+           'road': true,
+           'track': true
+         };
+         var paths = {
+           'path': true,
+           'footway': true,
+           'cycleway': true,
+           'bridleway': true,
+           'steps': true,
+           'pedestrian': true
+         };
+         var past_futures = {
+           'proposed': true,
+           'construction': true,
+           'abandoned': true,
+           'dismantled': true,
+           'disused': true,
+           'razed': true,
+           'demolished': true,
+           'obliterated': true
+         };
+         var _cullFactor = 1;
+         var _cache = {};
+         var _rules = {};
+         var _stats = {};
+         var _keys = [];
+         var _hidden = [];
+         var _forceVisible = {};
 
+         function update() {
+           if (!window.mocha) {
+             var hash = utilStringQs(window.location.hash);
+             var disabled = features.disabled();
 
-               _flashTimer = d3_timeout(function() {
-                   _flashTimer = null;
-                   context.container().select('.main-footer-wrap')
-                       .classed('footer-hide', false)
-                       .classed('footer-show', true);
-                   context.container().select('.flash-wrap')
-                       .classed('footer-hide', true)
-                       .classed('footer-show', false);
-               }, _duration);
+             if (disabled.length) {
+               hash.disable_features = disabled.join(',');
+             } else {
+               delete hash.disable_features;
+             }
 
-               return content;
+             window.location.replace('#' + utilQsString(hash, true));
+             corePreferences('disabled-features', disabled.join(','));
            }
 
+           _hidden = features.hidden();
+           dispatch$1.call('change');
+           dispatch$1.call('redraw');
+         }
 
-           flash.duration = function(_) {
-               if (!arguments.length) return _duration;
-               _duration = _;
-               return flash;
-           };
-
-           flash.text = function(_) {
-               if (!arguments.length) return _text;
-               _text = _;
-               return flash;
-           };
+         function defineRule(k, filter, max) {
+           var isEnabled = true;
 
-           flash.textClass = function(_) {
-               if (!arguments.length) return _textClass;
-               _textClass = _;
-               return flash;
-           };
+           _keys.push(k);
 
-           flash.iconName = function(_) {
-               if (!arguments.length) return _iconName;
-               _iconName = _;
-               return flash;
+           _rules[k] = {
+             filter: filter,
+             enabled: isEnabled,
+             // whether the user wants it enabled..
+             count: 0,
+             currentMax: max || Infinity,
+             defaultMax: max || Infinity,
+             enable: function enable() {
+               this.enabled = true;
+               this.currentMax = this.defaultMax;
+             },
+             disable: function disable() {
+               this.enabled = false;
+               this.currentMax = 0;
+             },
+             hidden: function hidden() {
+               return this.count === 0 && !this.enabled || this.count > this.currentMax * _cullFactor;
+             },
+             autoHidden: function autoHidden() {
+               return this.hidden() && this.currentMax > 0;
+             }
            };
+         }
 
-           flash.iconClass = function(_) {
-               if (!arguments.length) return _iconClass;
-               _iconClass = _;
-               return flash;
-           };
+         defineRule('points', function isPoint(tags, geometry) {
+           return geometry === 'point';
+         }, 200);
+         defineRule('traffic_roads', function isTrafficRoad(tags) {
+           return traffic_roads[tags.highway];
+         });
+         defineRule('service_roads', function isServiceRoad(tags) {
+           return service_roads[tags.highway];
+         });
+         defineRule('paths', function isPath(tags) {
+           return paths[tags.highway];
+         });
+         defineRule('buildings', function isBuilding(tags) {
+           return !!tags.building && tags.building !== 'no' || tags.parking === 'multi-storey' || tags.parking === 'sheds' || tags.parking === 'carports' || tags.parking === 'garage_boxes';
+         }, 250);
+         defineRule('building_parts', function isBuildingPart(tags) {
+           return tags['building:part'];
+         });
+         defineRule('indoor', function isIndoor(tags) {
+           return tags.indoor;
+         });
+         defineRule('landuse', function isLanduse(tags, geometry) {
+           return geometry === 'area' && !_rules.buildings.filter(tags) && !_rules.building_parts.filter(tags) && !_rules.indoor.filter(tags) && !_rules.water.filter(tags) && !_rules.pistes.filter(tags);
+         });
+         defineRule('boundaries', function isBoundary(tags) {
+           return !!tags.boundary && !(traffic_roads[tags.highway] || service_roads[tags.highway] || paths[tags.highway] || tags.waterway || tags.railway || tags.landuse || tags.natural || tags.building || tags.power);
+         });
+         defineRule('water', function isWater(tags) {
+           return !!tags.waterway || tags.natural === 'water' || tags.natural === 'coastline' || tags.natural === 'bay' || tags.landuse === 'pond' || tags.landuse === 'basin' || tags.landuse === 'reservoir' || tags.landuse === 'salt_pond';
+         });
+         defineRule('rail', function isRail(tags) {
+           return (!!tags.railway || tags.landuse === 'railway') && !(traffic_roads[tags.highway] || service_roads[tags.highway] || paths[tags.highway]);
+         });
+         defineRule('pistes', function isPiste(tags) {
+           return tags['piste:type'];
+         });
+         defineRule('aerialways', function isPiste(tags) {
+           return tags.aerialway && tags.aerialway !== 'yes' && tags.aerialway !== 'station';
+         });
+         defineRule('power', function isPower(tags) {
+           return !!tags.power;
+         }); // contains a past/future tag, but not in active use as a road/path/cycleway/etc..
 
-           return flash;
-       }
+         defineRule('past_future', function isPastFuture(tags) {
+           if (traffic_roads[tags.highway] || service_roads[tags.highway] || paths[tags.highway]) {
+             return false;
+           }
 
-       function uiFullScreen(context) {
-           var element = context.container().node();
-           // var button = d3_select(null);
+           var strings = Object.keys(tags);
 
+           for (var i = 0; i < strings.length; i++) {
+             var s = strings[i];
 
-           function getFullScreenFn() {
-               if (element.requestFullscreen) {
-                   return element.requestFullscreen;
-               } else if (element.msRequestFullscreen) {
-                   return element.msRequestFullscreen;
-               } else if (element.mozRequestFullScreen) {
-                   return element.mozRequestFullScreen;
-               } else if (element.webkitRequestFullscreen) {
-                   return element.webkitRequestFullscreen;
-               }
+             if (past_futures[s] || past_futures[tags[s]]) {
+               return true;
+             }
            }
 
+           return false;
+         }); // Lines or areas that don't match another feature filter.
+         // IMPORTANT: The 'others' feature must be the last one defined,
+         //   so that code in getMatches can skip this test if `hasMatch = true`
 
-           function getExitFullScreenFn() {
-               if (document.exitFullscreen) {
-                   return document.exitFullscreen;
-               } else if (document.msExitFullscreen) {
-                   return document.msExitFullscreen;
-               } else if (document.mozCancelFullScreen) {
-                   return document.mozCancelFullScreen;
-               } else if (document.webkitExitFullscreen) {
-                   return document.webkitExitFullscreen;
-               }
-           }
-
+         defineRule('others', function isOther(tags, geometry) {
+           return geometry === 'line' || geometry === 'area';
+         });
 
-           function isFullScreen() {
-               return document.fullscreenElement ||
-                   document.mozFullScreenElement ||
-                   document.webkitFullscreenElement ||
-                   document.msFullscreenElement;
-           }
+         features.features = function () {
+           return _rules;
+         };
 
+         features.keys = function () {
+           return _keys;
+         };
 
-           function isSupported() {
-               return !!getFullScreenFn();
+         features.enabled = function (k) {
+           if (!arguments.length) {
+             return _keys.filter(function (k) {
+               return _rules[k].enabled;
+             });
            }
 
+           return _rules[k] && _rules[k].enabled;
+         };
 
-           function fullScreen() {
-               event.preventDefault();
-               if (!isFullScreen()) {
-                   // button.classed('active', true);
-                   getFullScreenFn().apply(element);
-               } else {
-                   // button.classed('active', false);
-                   getExitFullScreenFn().apply(document);
-               }
+         features.disabled = function (k) {
+           if (!arguments.length) {
+             return _keys.filter(function (k) {
+               return !_rules[k].enabled;
+             });
            }
 
+           return _rules[k] && !_rules[k].enabled;
+         };
 
-           return function() { // selection) {
-               if (!isSupported()) return;
-
-               // button = selection.append('button')
-               //     .attr('title', t('full_screen'))
-               //     .attr('tabindex', -1)
-               //     .on('click', fullScreen)
-               //     .call(tooltip);
-
-               // button.append('span')
-               //     .attr('class', 'icon full-screen');
+         features.hidden = function (k) {
+           if (!arguments.length) {
+             return _keys.filter(function (k) {
+               return _rules[k].hidden();
+             });
+           }
 
-               var detected = utilDetect();
-               var keys = (detected.os === 'mac' ? [uiCmd('⌃⌘F'), 'f11'] : ['f11']);
-               context.keybinding().on(keys, fullScreen);
-           };
-       }
+           return _rules[k] && _rules[k].hidden();
+         };
 
-       function uiGeolocate(context) {
-           var _geolocationOptions = {
-               // prioritize speed and power usage over precision
-               enableHighAccuracy: false,
-               // don't hang indefinitely getting the location
-               timeout: 6000 // 6sec
-           };
-           var _locating = uiLoading(context).message(_t('geolocate.locating')).blocking(true);
-           var _layer = context.layers().layer('geolocate');
-           var _position;
-           var _extent;
-           var _timeoutID;
-           var _button = select(null);
+         features.autoHidden = function (k) {
+           if (!arguments.length) {
+             return _keys.filter(function (k) {
+               return _rules[k].autoHidden();
+             });
+           }
 
-           function click() {
-               if (context.inIntro()) return;
-               if (!_layer.enabled() && !_locating.isShown()) {
+           return _rules[k] && _rules[k].autoHidden();
+         };
 
-                   // This timeout ensures that we still call finish() even if
-                   // the user declines to share their location in Firefox
-                   _timeoutID = setTimeout(error, 10000 /* 10sec */ );
+         features.enable = function (k) {
+           if (_rules[k] && !_rules[k].enabled) {
+             _rules[k].enable();
 
-                   context.container().call(_locating);
-                   // get the latest position even if we already have one
-                   navigator.geolocation.getCurrentPosition(success, error, _geolocationOptions);
-               } else {
-                   _locating.close();
-                   _layer.enabled(null, false);
-                   updateButtonState();
-               }
+             update();
            }
+         };
 
-           function zoomTo() {
-               context.enter(modeBrowse(context));
+         features.enableAll = function () {
+           var didEnable = false;
 
-               var map = context.map();
-               _layer.enabled(_position, true);
-               updateButtonState();
-               map.centerZoomEase(_extent.center(), Math.min(20, map.extentZoom(_extent)));
-           }
+           for (var k in _rules) {
+             if (!_rules[k].enabled) {
+               didEnable = true;
 
-           function success(geolocation) {
-               _position = geolocation;
-               var coords = _position.coords;
-               _extent = geoExtent([coords.longitude, coords.latitude]).padByMeters(coords.accuracy);
-               zoomTo();
-               finish();
+               _rules[k].enable();
+             }
            }
 
-           function error() {
-               if (_position) {
-                   // use the position from a previous call if we have one
-                   zoomTo();
-               } else {
-                   context.ui().flash
-                       .text(_t('geolocate.location_unavailable'))
-                       .iconName('#iD-icon-geolocate')();
-               }
-
-               finish();
-           }
+           if (didEnable) update();
+         };
 
-           function finish() {
-               _locating.close();  // unblock ui
-               if (_timeoutID) { clearTimeout(_timeoutID); }
-               _timeoutID = undefined;
-           }
+         features.disable = function (k) {
+           if (_rules[k] && _rules[k].enabled) {
+             _rules[k].disable();
 
-           function updateButtonState() {
-               _button.classed('active', _layer.enabled());
+             update();
            }
+         };
 
-           return function(selection) {
-               if (!navigator.geolocation || !navigator.geolocation.getCurrentPosition) return;
-
-               _button = selection
-                   .append('button')
-                   .on('click', click)
-                   .call(svgIcon('#iD-icon-geolocate', 'light'))
-                   .call(uiTooltip()
-                       .placement((_mainLocalizer.textDirection() === 'rtl') ? 'right' : 'left')
-                       .title(_t('geolocate.title'))
-                       .keys([_t('geolocate.key')])
-                   );
+         features.disableAll = function () {
+           var didDisable = false;
 
-               context.keybinding().on(_t('geolocate.key'), click);
-           };
-       }
+           for (var k in _rules) {
+             if (_rules[k].enabled) {
+               didDisable = true;
 
-       function uiPanelBackground(context) {
-           var background = context.background();
-           var currSourceName = null;
-           var metadata = {};
-           var metadataKeys = [
-               'zoom', 'vintage', 'source', 'description', 'resolution', 'accuracy'
-           ];
+               _rules[k].disable();
+             }
+           }
 
-           var debouncedRedraw = debounce(redraw, 250);
+           if (didDisable) update();
+         };
 
-           function redraw(selection) {
-               var source = background.baseLayerSource();
-               if (!source) return;
+         features.toggle = function (k) {
+           if (_rules[k]) {
+             (function (f) {
+               return f.enabled ? f.disable() : f.enable();
+             })(_rules[k]);
 
-               var isDG = (source.id.match(/^DigitalGlobe/i) !== null);
+             update();
+           }
+         };
 
-               if (currSourceName !== source.name()) {
-                   currSourceName = source.name();
-                   metadata = {};
-               }
+         features.resetStats = function () {
+           for (var i = 0; i < _keys.length; i++) {
+             _rules[_keys[i]].count = 0;
+           }
 
-               selection.html('');
+           dispatch$1.call('change');
+         };
 
-               var list = selection
-                   .append('ul')
-                   .attr('class', 'background-info');
-
-               list
-                   .append('li')
-                   .text(currSourceName);
-
-               metadataKeys.forEach(function(k) {
-                   // DigitalGlobe vintage is available in raster layers for now.
-                   if (isDG && k === 'vintage') return;
-
-                   list
-                       .append('li')
-                       .attr('class', 'background-info-list-' + k)
-                       .classed('hide', !metadata[k])
-                       .text(_t('info_panels.background.' + k) + ':')
-                       .append('span')
-                       .attr('class', 'background-info-span-' + k)
-                       .text(metadata[k]);
-               });
+         features.gatherStats = function (d, resolver, dimensions) {
+           var needsRedraw = false;
+           var types = utilArrayGroupBy(d, 'type');
+           var entities = [].concat(types.relation || [], types.way || [], types.node || []);
+           var currHidden, geometry, matches, i, j;
 
-               debouncedGetMetadata(selection);
+           for (i = 0; i < _keys.length; i++) {
+             _rules[_keys[i]].count = 0;
+           } // adjust the threshold for point/building culling based on viewport size..
+           // a _cullFactor of 1 corresponds to a 1000x1000px viewport..
 
-               var toggleTiles = context.getDebug('tile') ? 'hide_tiles' : 'show_tiles';
 
-               selection
-                   .append('a')
-                   .text(_t('info_panels.background.' + toggleTiles))
-                   .attr('href', '#')
-                   .attr('class', 'button button-toggle-tiles')
-                   .on('click', function() {
-                       event.preventDefault();
-                       context.setDebug('tile', !context.getDebug('tile'));
-                       selection.call(redraw);
-                   });
+           _cullFactor = dimensions[0] * dimensions[1] / 1000000;
 
-               if (isDG) {
-                   var key = source.id + '-vintage';
-                   var sourceVintage = context.background().findSource(key);
-                   var showsVintage = context.background().showsLayer(sourceVintage);
-                   var toggleVintage = showsVintage ? 'hide_vintage' : 'show_vintage';
-                   selection
-                       .append('a')
-                       .text(_t('info_panels.background.' + toggleVintage))
-                       .attr('href', '#')
-                       .attr('class', 'button button-toggle-vintage')
-                       .on('click', function() {
-                           event.preventDefault();
-                           context.background().toggleOverlayLayer(sourceVintage);
-                           selection.call(redraw);
-                       });
-               }
+           for (i = 0; i < entities.length; i++) {
+             geometry = entities[i].geometry(resolver);
+             matches = Object.keys(features.getMatches(entities[i], resolver, geometry));
 
-               // disable if necessary
-               ['DigitalGlobe-Premium', 'DigitalGlobe-Standard'].forEach(function(layerId) {
-                   if (source.id !== layerId) {
-                       var key = layerId + '-vintage';
-                       var sourceVintage = context.background().findSource(key);
-                       if (context.background().showsLayer(sourceVintage)) {
-                           context.background().toggleOverlayLayer(sourceVintage);
-                       }
-                   }
-               });
+             for (j = 0; j < matches.length; j++) {
+               _rules[matches[j]].count++;
+             }
            }
 
+           currHidden = features.hidden();
 
-           var debouncedGetMetadata = debounce(getMetadata, 250);
-
-           function getMetadata(selection) {
-               var tile = context.container().select('.layer-background img.tile-center');   // tile near viewport center
-               if (tile.empty()) return;
+           if (currHidden !== _hidden) {
+             _hidden = currHidden;
+             needsRedraw = true;
+             dispatch$1.call('change');
+           }
 
-               var sourceName = currSourceName;
-               var d = tile.datum();
-               var zoom = (d && d.length >= 3 && d[2]) || Math.floor(context.map().zoom());
-               var center = context.map().center();
+           return needsRedraw;
+         };
 
-               // update zoom
-               metadata.zoom = String(zoom);
-               selection.selectAll('.background-info-list-zoom')
-                   .classed('hide', false)
-                   .selectAll('.background-info-span-zoom')
-                   .text(metadata.zoom);
-
-               if (!d || !d.length >= 3) return;
-
-               background.baseLayerSource().getMetadata(center, d, function(err, result) {
-                   if (err || currSourceName !== sourceName) return;
-
-                   // update vintage
-                   var vintage = result.vintage;
-                   metadata.vintage = (vintage && vintage.range) || _t('info_panels.background.unknown');
-                   selection.selectAll('.background-info-list-vintage')
-                       .classed('hide', false)
-                       .selectAll('.background-info-span-vintage')
-                       .text(metadata.vintage);
-
-                   // update other metdata
-                   metadataKeys.forEach(function(k) {
-                       if (k === 'zoom' || k === 'vintage') return;  // done already
-                       var val = result[k];
-                       metadata[k] = val;
-                       selection.selectAll('.background-info-list-' + k)
-                           .classed('hide', !val)
-                           .selectAll('.background-info-span-' + k)
-                           .text(val);
-                   });
-               });
+         features.stats = function () {
+           for (var i = 0; i < _keys.length; i++) {
+             _stats[_keys[i]] = _rules[_keys[i]].count;
            }
 
+           return _stats;
+         };
 
-           var panel = function(selection) {
-               selection.call(redraw);
-
-               context.map()
-                   .on('drawn.info-background', function() {
-                       selection.call(debouncedRedraw);
-                   })
-                   .on('move.info-background', function() {
-                       selection.call(debouncedGetMetadata);
-                   });
+         features.clear = function (d) {
+           for (var i = 0; i < d.length; i++) {
+             features.clearEntity(d[i]);
+           }
+         };
 
-           };
+         features.clearEntity = function (entity) {
+           delete _cache[osmEntity.key(entity)];
+         };
 
-           panel.off = function() {
-               context.map()
-                   .on('drawn.info-background', null)
-                   .on('move.info-background', null);
-           };
+         features.reset = function () {
+           Array.from(_deferred).forEach(function (handle) {
+             window.cancelIdleCallback(handle);
 
-           panel.id = 'background';
-           panel.title = _t('info_panels.background.title');
-           panel.key = _t('info_panels.background.key');
+             _deferred["delete"](handle);
+           });
+           _cache = {};
+         }; // only certain relations are worth checking
 
 
-           return panel;
-       }
+         function relationShouldBeChecked(relation) {
+           // multipolygon features have `area` geometry and aren't checked here
+           return relation.tags.type === 'boundary';
+         }
 
-       function uiPanelHistory(context) {
-           var osm;
+         features.getMatches = function (entity, resolver, geometry) {
+           if (geometry === 'vertex' || geometry === 'relation' && !relationShouldBeChecked(entity)) return {};
+           var ent = osmEntity.key(entity);
 
-           function displayTimestamp(timestamp) {
-               if (!timestamp) return _t('info_panels.history.unknown');
-               var options = {
-                   day: 'numeric', month: 'short', year: 'numeric',
-                   hour: 'numeric', minute: 'numeric', second: 'numeric'
-               };
-               var d = new Date(timestamp);
-               if (isNaN(d.getTime())) return _t('info_panels.history.unknown');
-               return d.toLocaleString(_mainLocalizer.localeCode(), options);
+           if (!_cache[ent]) {
+             _cache[ent] = {};
            }
 
+           if (!_cache[ent].matches) {
+             var matches = {};
+             var hasMatch = false;
 
-           function displayUser(selection, userName) {
-               if (!userName) {
-                   selection
-                       .append('span')
-                       .text(_t('info_panels.history.unknown'));
-                   return;
-               }
-
-               selection
-                   .append('span')
-                   .attr('class', 'user-name')
-                   .text(userName);
-
-               var links = selection
-                   .append('div')
-                   .attr('class', 'links');
+             for (var i = 0; i < _keys.length; i++) {
+               if (_keys[i] === 'others') {
+                 if (hasMatch) continue; // If an entity...
+                 //   1. is a way that hasn't matched other 'interesting' feature rules,
 
-               if (osm) {
-                   links
-                       .append('a')
-                       .attr('class', 'user-osm-link')
-                       .attr('href', osm.userURL(userName))
-                       .attr('target', '_blank')
-                       .attr('tabindex', -1)
-                       .text('OSM');
-               }
-
-               links
-                   .append('a')
-                   .attr('class', 'user-hdyc-link')
-                   .attr('href', 'https://hdyc.neis-one.org/?' + userName)
-                   .attr('target', '_blank')
-                   .attr('tabindex', -1)
-                   .text('HDYC');
-           }
-
-
-           function displayChangeset(selection, changeset) {
-               if (!changeset) {
-                   selection
-                       .append('span')
-                       .text(_t('info_panels.history.unknown'));
-                   return;
-               }
+                 if (entity.type === 'way') {
+                   var parents = features.getParents(entity, resolver, geometry); //   2a. belongs only to a single multipolygon relation
 
-               selection
-                   .append('span')
-                   .attr('class', 'changeset-id')
-                   .text(changeset);
+                   if (parents.length === 1 && parents[0].isMultipolygon() || // 2b. or belongs only to boundary relations
+                   parents.length > 0 && parents.every(function (parent) {
+                     return parent.tags.type === 'boundary';
+                   })) {
+                     // ...then match whatever feature rules the parent relation has matched.
+                     // see #2548, #2887
+                     //
+                     // IMPORTANT:
+                     // For this to work, getMatches must be called on relations before ways.
+                     //
+                     var pkey = osmEntity.key(parents[0]);
 
-               var links = selection
-                   .append('div')
-                   .attr('class', 'links');
+                     if (_cache[pkey] && _cache[pkey].matches) {
+                       matches = Object.assign({}, _cache[pkey].matches); // shallow copy
 
-               if (osm) {
-                   links
-                       .append('a')
-                       .attr('class', 'changeset-osm-link')
-                       .attr('href', osm.changesetURL(changeset))
-                       .attr('target', '_blank')
-                       .attr('tabindex', -1)
-                       .text('OSM');
-               }
-
-               links
-                   .append('a')
-                   .attr('class', 'changeset-osmcha-link')
-                   .attr('href', 'https://osmcha.org/changesets/' + changeset)
-                   .attr('target', '_blank')
-                   .attr('tabindex', -1)
-                   .text('OSMCha');
-
-               links
-                   .append('a')
-                   .attr('class', 'changeset-achavi-link')
-                   .attr('href', 'https://overpass-api.de/achavi/?changeset=' + changeset)
-                   .attr('target', '_blank')
-                   .attr('tabindex', -1)
-                   .text('Achavi');
-           }
-
-
-           function redraw(selection) {
-               var selectedNoteID = context.selectedNoteID();
-               osm = context.connection();
-
-               var selected, note, entity;
-               if (selectedNoteID && osm) {       // selected 1 note
-                   selected = [ _t('note.note') + ' ' + selectedNoteID ];
-                   note = osm.getNote(selectedNoteID);
-               } else {                           // selected 1..n entities
-                   selected = context.selectedIDs()
-                       .filter(function(e) { return context.hasEntity(e); });
-                   if (selected.length) {
-                       entity = context.entity(selected[0]);
+                       continue;
+                     }
                    }
+                 }
                }
 
-               var singular = selected.length === 1 ? selected[0] : null;
+               if (_rules[_keys[i]].filter(entity.tags, geometry)) {
+                 matches[_keys[i]] = hasMatch = true;
+               }
+             }
 
-               selection.html('');
+             _cache[ent].matches = matches;
+           }
 
-               selection
-                   .append('h4')
-                   .attr('class', 'history-heading')
-                   .text(singular || _t('info_panels.history.selected', { n: selected.length }));
+           return _cache[ent].matches;
+         };
 
-               if (!singular) return;
+         features.getParents = function (entity, resolver, geometry) {
+           if (geometry === 'point') return [];
+           var ent = osmEntity.key(entity);
 
-               if (entity) {
-                   selection.call(redrawEntity, entity);
-               } else if (note) {
-                   selection.call(redrawNote, note);
-               }
+           if (!_cache[ent]) {
+             _cache[ent] = {};
            }
 
+           if (!_cache[ent].parents) {
+             var parents = [];
 
-           function redrawNote(selection, note) {
-               if (!note || note.isNew()) {
-                   selection
-                       .append('div')
-                       .text(_t('info_panels.history.note_no_history'));
-                   return;
-               }
+             if (geometry === 'vertex') {
+               parents = resolver.parentWays(entity);
+             } else {
+               // 'line', 'area', 'relation'
+               parents = resolver.parentRelations(entity);
+             }
 
-               var list = selection
-                   .append('ul');
+             _cache[ent].parents = parents;
+           }
 
-               list
-                   .append('li')
-                   .text(_t('info_panels.history.note_comments') + ':')
-                   .append('span')
-                   .text(note.comments.length);
+           return _cache[ent].parents;
+         };
 
-               if (note.comments.length) {
-                   list
-                       .append('li')
-                       .text(_t('info_panels.history.note_created_date') + ':')
-                       .append('span')
-                       .text(displayTimestamp(note.comments[0].date));
+         features.isHiddenPreset = function (preset, geometry) {
+           if (!_hidden.length) return false;
+           if (!preset.tags) return false;
+           var test = preset.setTags({}, geometry);
 
-                   list
-                       .append('li')
-                       .text(_t('info_panels.history.note_created_user') + ':')
-                       .call(displayUser, note.comments[0].user);
+           for (var key in _rules) {
+             if (_rules[key].filter(test, geometry)) {
+               if (_hidden.indexOf(key) !== -1) {
+                 return key;
                }
 
-               if (osm) {
-                   selection
-                       .append('a')
-                       .attr('class', 'view-history-on-osm')
-                       .attr('target', '_blank')
-                       .attr('tabindex', -1)
-                       .attr('href', osm.noteURL(note))
-                       .call(svgIcon('#iD-icon-out-link', 'inline'))
-                       .append('span')
-                       .text(_t('info_panels.history.note_link_text'));
-               }
+               return false;
+             }
            }
 
+           return false;
+         };
 
-           function redrawEntity(selection, entity) {
-               if (!entity || entity.isNew()) {
-                   selection
-                       .append('div')
-                       .text(_t('info_panels.history.no_history'));
-                   return;
-               }
+         features.isHiddenFeature = function (entity, resolver, geometry) {
+           if (!_hidden.length) return false;
+           if (!entity.version) return false;
+           if (_forceVisible[entity.id]) return false;
+           var matches = Object.keys(features.getMatches(entity, resolver, geometry));
+           return matches.length && matches.every(function (k) {
+             return features.hidden(k);
+           });
+         };
 
-               var links = selection
-                   .append('div')
-                   .attr('class', 'links');
+         features.isHiddenChild = function (entity, resolver, geometry) {
+           if (!_hidden.length) return false;
+           if (!entity.version || geometry === 'point') return false;
+           if (_forceVisible[entity.id]) return false;
+           var parents = features.getParents(entity, resolver, geometry);
+           if (!parents.length) return false;
 
-               if (osm) {
-                   links
-                       .append('a')
-                       .attr('class', 'view-history-on-osm')
-                       .attr('href', osm.historyURL(entity))
-                       .attr('target', '_blank')
-                       .attr('tabindex', -1)
-                       .attr('title', _t('info_panels.history.link_text'))
-                       .text('OSM');
-               }
-               links
-                   .append('a')
-                   .attr('class', 'pewu-history-viewer-link')
-                   .attr('href', 'https://pewu.github.io/osm-history/#/' + entity.type + '/' + entity.osmId())
-                   .attr('target', '_blank')
-                   .attr('tabindex', -1)
-                   .text('PeWu');
-
-               var list = selection
-                   .append('ul');
-
-               list
-                   .append('li')
-                   .text(_t('info_panels.history.version') + ':')
-                   .append('span')
-                   .text(entity.version);
-
-               list
-                   .append('li')
-                   .text(_t('info_panels.history.last_edit') + ':')
-                   .append('span')
-                   .text(displayTimestamp(entity.timestamp));
-
-               list
-                   .append('li')
-                   .text(_t('info_panels.history.edited_by') + ':')
-                   .call(displayUser, entity.user);
-
-               list
-                   .append('li')
-                   .text(_t('info_panels.history.changeset') + ':')
-                   .call(displayChangeset, entity.changeset);
-           }
-
-
-           var panel = function(selection) {
-               selection.call(redraw);
+           for (var i = 0; i < parents.length; i++) {
+             if (!features.isHidden(parents[i], resolver, parents[i].geometry(resolver))) {
+               return false;
+             }
+           }
 
-               context.map()
-                   .on('drawn.info-history', function() {
-                       selection.call(redraw);
-                   });
+           return true;
+         };
 
-               context
-                   .on('enter.info-history', function() {
-                       selection.call(redraw);
-                   });
-           };
+         features.hasHiddenConnections = function (entity, resolver) {
+           if (!_hidden.length) return false;
+           var childNodes, connections;
 
-           panel.off = function() {
-               context.map().on('drawn.info-history', null);
-               context.on('enter.info-history', null);
-           };
+           if (entity.type === 'midpoint') {
+             childNodes = [resolver.entity(entity.edge[0]), resolver.entity(entity.edge[1])];
+             connections = [];
+           } else {
+             childNodes = entity.nodes ? resolver.childNodes(entity) : [];
+             connections = features.getParents(entity, resolver, entity.geometry(resolver));
+           } // gather ways connected to child nodes..
 
-           panel.id = 'history';
-           panel.title = _t('info_panels.history.title');
-           panel.key = _t('info_panels.history.key');
 
+           connections = childNodes.reduce(function (result, e) {
+             return resolver.isShared(e) ? utilArrayUnion(result, resolver.parentWays(e)) : result;
+           }, connections);
+           return connections.some(function (e) {
+             return features.isHidden(e, resolver, e.geometry(resolver));
+           });
+         };
 
-           return panel;
-       }
+         features.isHidden = function (entity, resolver, geometry) {
+           if (!_hidden.length) return false;
+           if (!entity.version) return false;
+           var fn = geometry === 'vertex' ? features.isHiddenChild : features.isHiddenFeature;
+           return fn(entity, resolver, geometry);
+         };
 
-       var OSM_PRECISION = 7;
+         features.filter = function (d, resolver) {
+           if (!_hidden.length) return d;
+           var result = [];
 
-       /**
-        * Returns a localized representation of the given length measurement.
-        *
-        * @param {Number} m area in meters
-        * @param {Boolean} isImperial true for U.S. customary units; false for metric
-        */
-       function displayLength(m, isImperial) {
-           var d = m * (isImperial ? 3.28084 : 1);
-           var unit;
+           for (var i = 0; i < d.length; i++) {
+             var entity = d[i];
 
-           if (isImperial) {
-               if (d >= 5280) {
-                   d /= 5280;
-                   unit = 'miles';
-               } else {
-                   unit = 'feet';
-               }
-           } else {
-               if (d >= 1000) {
-                   d /= 1000;
-                   unit = 'kilometers';
-               } else {
-                   unit = 'meters';
-               }
+             if (!features.isHidden(entity, resolver, entity.geometry(resolver))) {
+               result.push(entity);
+             }
            }
 
-           return _t('units.' + unit, {
-               quantity: d.toLocaleString(_mainLocalizer.localeCode(), {
-                   maximumSignificantDigits: 4
-               })
-           });
-       }
+           return result;
+         };
 
-       /**
-        * Returns a localized representation of the given area measurement.
-        *
-        * @param {Number} m2 area in square meters
-        * @param {Boolean} isImperial true for U.S. customary units; false for metric
-        */
-       function displayArea(m2, isImperial) {
-           var locale = _mainLocalizer.localeCode();
-           var d = m2 * (isImperial ? 10.7639111056 : 1);
-           var d1, d2, area;
-           var unit1 = '';
-           var unit2 = '';
+         features.forceVisible = function (entityIDs) {
+           if (!arguments.length) return Object.keys(_forceVisible);
+           _forceVisible = {};
 
-           if (isImperial) {
-               if (d >= 6969600) { // > 0.25mi² show mi²
-                   d1 = d / 27878400;
-                   unit1 = 'square_miles';
-               } else {
-                   d1 = d;
-                   unit1 = 'square_feet';
-               }
+           for (var i = 0; i < entityIDs.length; i++) {
+             _forceVisible[entityIDs[i]] = true;
+             var entity = context.hasEntity(entityIDs[i]);
 
-               if (d > 4356 && d < 43560000) { // 0.1 - 1000 acres
-                   d2 = d / 43560;
-                   unit2 = 'acres';
+             if (entity && entity.type === 'relation') {
+               // also show relation members (one level deep)
+               for (var j in entity.members) {
+                 _forceVisible[entity.members[j].id] = true;
                }
+             }
+           }
 
-           } else {
-               if (d >= 250000) { // > 0.25km² show km²
-                   d1 = d / 1000000;
-                   unit1 = 'square_kilometers';
-               } else {
-                   d1 = d;
-                   unit1 = 'square_meters';
-               }
+           return features;
+         };
 
-               if (d > 1000 && d < 10000000) { // 0.1 - 1000 hectares
-                   d2 = d / 10000;
-                   unit2 = 'hectares';
-               }
+         features.init = function () {
+           var storage = corePreferences('disabled-features');
+
+           if (storage) {
+             var storageDisabled = storage.replace(/;/g, ',').split(',');
+             storageDisabled.forEach(features.disable);
            }
 
-           area = _t('units.' + unit1, {
-               quantity: d1.toLocaleString(locale, {
-                   maximumSignificantDigits: 4
-               })
-           });
+           var hash = utilStringQs(window.location.hash);
 
-           if (d2) {
-               return _t('units.area_pair', {
-                   area1: area,
-                   area2: _t('units.' + unit2, {
-                       quantity: d2.toLocaleString(locale, {
-                           maximumSignificantDigits: 2
-                       })
-                   })
-               });
-           } else {
-               return area;
+           if (hash.disable_features) {
+             var hashDisabled = hash.disable_features.replace(/;/g, ',').split(',');
+             hashDisabled.forEach(features.disable);
            }
-       }
-
-       function wrap(x, min, max) {
-           var d = max - min;
-           return ((x - min) % d + d) % d + min;
-       }
+         }; // warm up the feature matching cache upon merging fetched data
 
-       function clamp$1(x, min, max) {
-           return Math.max(min, Math.min(x, max));
-       }
 
-       function displayCoordinate(deg, pos, neg) {
-           var locale = _mainLocalizer.localeCode();
-           var min = (Math.abs(deg) - Math.floor(Math.abs(deg))) * 60;
-           var sec = (min - Math.floor(min)) * 60;
-           var displayDegrees = _t('units.arcdegrees', {
-               quantity: Math.floor(Math.abs(deg)).toLocaleString(locale)
-           });
-           var displayCoordinate;
-
-           if (Math.floor(sec) > 0) {
-               displayCoordinate = displayDegrees +
-                   _t('units.arcminutes', {
-                       quantity: Math.floor(min).toLocaleString(locale)
-                   }) +
-                   _t('units.arcseconds', {
-                       quantity: Math.round(sec).toLocaleString(locale)
-                   });
-           } else if (Math.floor(min) > 0) {
-               displayCoordinate = displayDegrees +
-                   _t('units.arcminutes', {
-                       quantity: Math.round(min).toLocaleString(locale)
-                   });
-           } else {
-               displayCoordinate = _t('units.arcdegrees', {
-                   quantity: Math.round(Math.abs(deg)).toLocaleString(locale)
-               });
-           }
+         context.history().on('merge.features', function (newEntities) {
+           if (!newEntities) return;
+           var handle = window.requestIdleCallback(function () {
+             var graph = context.graph();
+             var types = utilArrayGroupBy(newEntities, 'type'); // ensure that getMatches is called on relations before ways
 
-           if (deg === 0) {
-               return displayCoordinate;
-           } else {
-               return _t('units.coordinate', {
-                   coordinate: displayCoordinate,
-                   direction: _t('units.' + (deg > 0 ? pos : neg))
-               });
-           }
-       }
+             var entities = [].concat(types.relation || [], types.way || [], types.node || []);
 
-       /**
-        * Returns given coordinate pair in degree-minute-second format.
-        *
-        * @param {Array<Number>} coord longitude and latitude
-        */
-       function dmsCoordinatePair(coord) {
-           return _t('units.coordinate_pair', {
-               latitude: displayCoordinate(clamp$1(coord[1], -90, 90), 'north', 'south'),
-               longitude: displayCoordinate(wrap(coord[0], -180, 180), 'east', 'west')
+             for (var i = 0; i < entities.length; i++) {
+               var geometry = entities[i].geometry(graph);
+               features.getMatches(entities[i], graph, geometry);
+             }
            });
-       }
 
-       /**
-        * Returns the given coordinate pair in decimal format.
-        * note: unlocalized to avoid comma ambiguity - see #4765
-        *
-        * @param {Array<Number>} coord longitude and latitude
-        */
-       function decimalCoordinatePair(coord) {
-           return _t('units.coordinate_pair', {
-               latitude: clamp$1(coord[1], -90, 90).toFixed(OSM_PRECISION),
-               longitude: wrap(coord[0], -180, 180).toFixed(OSM_PRECISION)
-           });
+           _deferred.add(handle);
+         });
+         return features;
        }
 
-       function uiPanelLocation(context) {
-           var currLocation = '';
-
-
-           function redraw(selection) {
-               selection.html('');
+       //
+       // - the activeID - nope
+       // - 1 away (adjacent) to the activeID - yes (vertices will be merged)
+       // - 2 away from the activeID - nope (would create a self intersecting segment)
+       // - all others on a linear way - yes
+       // - all others on a closed way - nope (would create a self intersecting polygon)
+       //
+       // returns
+       // 0 = active vertex - no touch/connect
+       // 1 = passive vertex - yes touch/connect
+       // 2 = adjacent vertex - yes but pay attention segmenting a line here
+       //
 
-               var list = selection
-                   .append('ul');
+       function svgPassiveVertex(node, graph, activeID) {
+         if (!activeID) return 1;
+         if (activeID === node.id) return 0;
+         var parents = graph.parentWays(node);
+         var i, j, nodes, isClosed, ix1, ix2, ix3, ix4, max;
+
+         for (i = 0; i < parents.length; i++) {
+           nodes = parents[i].nodes;
+           isClosed = parents[i].isClosed();
+
+           for (j = 0; j < nodes.length; j++) {
+             // find this vertex, look nearby
+             if (nodes[j] === node.id) {
+               ix1 = j - 2;
+               ix2 = j - 1;
+               ix3 = j + 1;
+               ix4 = j + 2;
 
-               // Mouse coordinates
-               var coord = context.map().mouseCoordinates();
-               if (coord.some(isNaN)) {
-                   coord = context.map().center();
+               if (isClosed) {
+                 // wraparound if needed
+                 max = nodes.length - 1;
+                 if (ix1 < 0) ix1 = max + ix1;
+                 if (ix2 < 0) ix2 = max + ix2;
+                 if (ix3 > max) ix3 = ix3 - max;
+                 if (ix4 > max) ix4 = ix4 - max;
                }
 
-               list
-                   .append('li')
-                   .text(dmsCoordinatePair(coord))
-                   .append('li')
-                   .text(decimalCoordinatePair(coord));
-
-               // Location Info
-               selection
-                   .append('div')
-                   .attr('class', 'location-info')
-                   .text(currLocation || ' ');
-
-               debouncedGetLocation(selection, coord);
+               if (nodes[ix1] === activeID) return 0; // no - prevent self intersect
+               else if (nodes[ix2] === activeID) return 2; // ok - adjacent
+                 else if (nodes[ix3] === activeID) return 2; // ok - adjacent
+                   else if (nodes[ix4] === activeID) return 0; // no - prevent self intersect
+                     else if (isClosed && nodes.indexOf(activeID) !== -1) return 0; // no - prevent self intersect
+             }
            }
+         }
 
+         return 1; // ok
+       }
+       function svgMarkerSegments(projection, graph, dt, shouldReverse, bothDirections) {
+         return function (entity) {
+           var i = 0;
+           var offset = dt;
+           var segments = [];
+           var clip = d3_geoIdentity().clipExtent(projection.clipExtent()).stream;
+           var coordinates = graph.childNodes(entity).map(function (n) {
+             return n.loc;
+           });
+           var a, b;
 
-           var debouncedGetLocation = debounce(getLocation, 250);
-           function getLocation(selection, coord) {
-               if (!services.geocoder) {
-                   currLocation = _t('info_panels.location.unknown_location');
-                   selection.selectAll('.location-info')
-                       .text(currLocation);
-               } else {
-                   services.geocoder.reverse(coord, function(err, result) {
-                       currLocation = result ? result.display_name : _t('info_panels.location.unknown_location');
-                       selection.selectAll('.location-info')
-                           .text(currLocation);
-                   });
-               }
+           if (shouldReverse(entity)) {
+             coordinates.reverse();
            }
 
+           d3_geoStream({
+             type: 'LineString',
+             coordinates: coordinates
+           }, projection.stream(clip({
+             lineStart: function lineStart() {},
+             lineEnd: function lineEnd() {
+               a = null;
+             },
+             point: function point(x, y) {
+               b = [x, y];
 
-           var panel = function(selection) {
-               selection.call(redraw);
-
-               context.surface()
-                   .on(('PointerEvent' in window ? 'pointer' : 'mouse') + 'move.info-location', function() {
-                       selection.call(redraw);
-                   });
-           };
+               if (a) {
+                 var span = geoVecLength(a, b) - offset;
 
-           panel.off = function() {
-               context.surface()
-                   .on('.info-location', null);
-           };
+                 if (span >= 0) {
+                   var heading = geoVecAngle(a, b);
+                   var dx = dt * Math.cos(heading);
+                   var dy = dt * Math.sin(heading);
+                   var p = [a[0] + offset * Math.cos(heading), a[1] + offset * Math.sin(heading)]; // gather coordinates
 
-           panel.id = 'location';
-           panel.title = _t('info_panels.location.title');
-           panel.key = _t('info_panels.location.key');
+                   var coord = [a, p];
 
+                   for (span -= dt; span >= 0; span -= dt) {
+                     p = geoVecAdd(p, [dx, dy]);
+                     coord.push(p);
+                   }
 
-           return panel;
-       }
+                   coord.push(b); // generate svg paths
 
-       function uiPanelMeasurement(context) {
-           var locale = _mainLocalizer.localeCode();
-           var isImperial = !_mainLocalizer.usesMetric();
+                   var segment = '';
+                   var j;
 
+                   for (j = 0; j < coord.length; j++) {
+                     segment += (j === 0 ? 'M' : 'L') + coord[j][0] + ',' + coord[j][1];
+                   }
 
-           function radiansToMeters(r) {
-               // using WGS84 authalic radius (6371007.1809 m)
-               return r * 6371007.1809;
-           }
+                   segments.push({
+                     id: entity.id,
+                     index: i++,
+                     d: segment
+                   });
 
-           function steradiansToSqmeters(r) {
-               // http://gis.stackexchange.com/a/124857/40446
-               return r / (4 * Math.PI) * 510065621724000;
-           }
+                   if (bothDirections(entity)) {
+                     segment = '';
 
+                     for (j = coord.length - 1; j >= 0; j--) {
+                       segment += (j === coord.length - 1 ? 'M' : 'L') + coord[j][0] + ',' + coord[j][1];
+                     }
 
-           function toLineString(feature) {
-               if (feature.type === 'LineString') return feature;
+                     segments.push({
+                       id: entity.id,
+                       index: i++,
+                       d: segment
+                     });
+                   }
+                 }
 
-               var result = { type: 'LineString', coordinates: [] };
-               if (feature.type === 'Polygon') {
-                   result.coordinates = feature.coordinates[0];
-               } else if (feature.type === 'MultiPolygon') {
-                   result.coordinates = feature.coordinates[0][0];
+                 offset = -span;
                }
 
-               return result;
+               a = b;
+             }
+           })));
+           return segments;
+         };
+       }
+       function svgPath(projection, graph, isArea) {
+         // Explanation of magic numbers:
+         // "padding" here allows space for strokes to extend beyond the viewport,
+         // so that the stroke isn't drawn along the edge of the viewport when
+         // the shape is clipped.
+         //
+         // When drawing lines, pad viewport by 5px.
+         // When drawing areas, pad viewport by 65px in each direction to allow
+         // for 60px area fill stroke (see ".fill-partial path.fill" css rule)
+         var cache = {};
+         var padding = isArea ? 65 : 5;
+         var viewport = projection.clipExtent();
+         var paddedExtent = [[viewport[0][0] - padding, viewport[0][1] - padding], [viewport[1][0] + padding, viewport[1][1] + padding]];
+         var clip = d3_geoIdentity().clipExtent(paddedExtent).stream;
+         var project = projection.stream;
+         var path = d3_geoPath().projection({
+           stream: function stream(output) {
+             return project(clip(output));
            }
+         });
 
+         var svgpath = function svgpath(entity) {
+           if (entity.id in cache) {
+             return cache[entity.id];
+           } else {
+             return cache[entity.id] = path(entity.asGeoJSON(graph));
+           }
+         };
 
-           function redraw(selection) {
-               var graph = context.graph();
-               var selectedNoteID = context.selectedNoteID();
-               var osm = services.osm;
-
-               var heading;
-               var center, location, centroid;
-               var closed, geometry;
-               var totalNodeCount, length = 0, area = 0;
+         svgpath.geojson = function (d) {
+           if (d.__featurehash__ !== undefined) {
+             if (d.__featurehash__ in cache) {
+               return cache[d.__featurehash__];
+             } else {
+               return cache[d.__featurehash__] = path(d);
+             }
+           } else {
+             return path(d);
+           }
+         };
 
-               if (selectedNoteID && osm) {       // selected 1 note
+         return svgpath;
+       }
+       function svgPointTransform(projection) {
+         var svgpoint = function svgpoint(entity) {
+           // http://jsperf.com/short-array-join
+           var pt = projection(entity.loc);
+           return 'translate(' + pt[0] + ',' + pt[1] + ')';
+         };
 
-                   var note = osm.getNote(selectedNoteID);
-                   heading = _t('note.note') + ' ' + selectedNoteID;
-                   location = note.loc;
-                   geometry = 'note';
+         svgpoint.geojson = function (d) {
+           return svgpoint(d.properties.entity);
+         };
 
-               } else {                           // selected 1..n entities
-                   var selectedIDs = context.selectedIDs().filter(function(id) {
-                       return context.hasEntity(id);
-                   });
-                   var selected = selectedIDs.map(function(id) {
-                       return context.entity(id);
-                   });
+         return svgpoint;
+       }
+       function svgRelationMemberTags(graph) {
+         return function (entity) {
+           var tags = entity.tags;
+           var shouldCopyMultipolygonTags = !entity.hasInterestingTags();
+           graph.parentRelations(entity).forEach(function (relation) {
+             var type = relation.tags.type;
 
-                   heading = selected.length === 1 ? selected[0].id :
-                       _t('info_panels.measurement.selected', { n: selected.length.toLocaleString(locale) });
-
-                   if (selected.length) {
-                       var extent = geoExtent();
-                       for (var i in selected) {
-                           var entity = selected[i];
-                           extent._extend(entity.extent(graph));
-
-                           geometry = entity.geometry(graph);
-                           if (geometry === 'line' || geometry === 'area') {
-                               closed = (entity.type === 'relation') || (entity.isClosed() && !entity.isDegenerate());
-                               var feature = entity.asGeoJSON(graph);
-                               length += radiansToMeters(d3_geoLength(toLineString(feature)));
-                               centroid = d3_geoCentroid(feature);
-                               if (closed) {
-                                   area += steradiansToSqmeters(entity.area(graph));
-                               }
-                           }
-                       }
+             if (type === 'multipolygon' && shouldCopyMultipolygonTags || type === 'boundary') {
+               tags = Object.assign({}, relation.tags, tags);
+             }
+           });
+           return tags;
+         };
+       }
+       function svgSegmentWay(way, graph, activeID) {
+         // When there is no activeID, we can memoize this expensive computation
+         if (activeID === undefined) {
+           return graph["transient"](way, 'waySegments', getWaySegments);
+         } else {
+           return getWaySegments();
+         }
 
-                       if (selected.length > 1) {
-                           geometry = null;
-                           closed = null;
-                           centroid = null;
-                       }
+         function getWaySegments() {
+           var isActiveWay = way.nodes.indexOf(activeID) !== -1;
+           var features = {
+             passive: [],
+             active: []
+           };
+           var start = {};
+           var end = {};
+           var node, type;
 
-                       if (selected.length === 1 && selected[0].type === 'node') {
-                           location = selected[0].loc;
-                       } else {
-                           totalNodeCount = utilGetAllNodes(selectedIDs, context.graph()).length;
-                       }
+           for (var i = 0; i < way.nodes.length; i++) {
+             node = graph.entity(way.nodes[i]);
+             type = svgPassiveVertex(node, graph, activeID);
+             end = {
+               node: node,
+               type: type
+             };
 
-                       if (!location && !centroid) {
-                           center = extent.center();
-                       }
-                   }
+             if (start.type !== undefined) {
+               if (start.node.id === activeID || end.node.id === activeID) ; else if (isActiveWay && (start.type === 2 || end.type === 2)) {
+                 // one adjacent vertex
+                 pushActive(start, end, i);
+               } else if (start.type === 0 && end.type === 0) {
+                 // both active vertices
+                 pushActive(start, end, i);
+               } else {
+                 pushPassive(start, end, i);
                }
+             }
 
-               selection.html('');
-
-               if (heading) {
-                   selection
-                       .append('h4')
-                       .attr('class', 'measurement-heading')
-                       .text(heading);
-               }
+             start = end;
+           }
 
-               var list = selection
-                   .append('ul');
-               var coordItem;
+           return features;
 
-               if (geometry) {
-                   list
-                       .append('li')
-                       .text(_t('info_panels.measurement.geometry') + ':')
-                       .append('span')
-                       .text(
-                           closed ? _t('info_panels.measurement.closed_' + geometry) : _t('geometry.' + geometry)
-                       );
+           function pushActive(start, end, index) {
+             features.active.push({
+               type: 'Feature',
+               id: way.id + '-' + index + '-nope',
+               properties: {
+                 nope: true,
+                 target: true,
+                 entity: way,
+                 nodes: [start.node, end.node],
+                 index: index
+               },
+               geometry: {
+                 type: 'LineString',
+                 coordinates: [start.node.loc, end.node.loc]
                }
+             });
+           }
 
-               if (totalNodeCount) {
-                   list
-                       .append('li')
-                       .text(_t('info_panels.measurement.node_count') + ':')
-                       .append('span')
-                       .text(totalNodeCount.toLocaleString(locale));
-               }
-
-               if (area) {
-                   list
-                       .append('li')
-                       .text(_t('info_panels.measurement.area') + ':')
-                       .append('span')
-                       .text(displayArea(area, isImperial));
-               }
-
-               if (length) {
-                   var lengthLabel = _t('info_panels.measurement.' + (closed ? 'perimeter' : 'length'));
-                   list
-                       .append('li')
-                       .text(lengthLabel + ':')
-                       .append('span')
-                       .text(displayLength(length, isImperial));
-               }
-
-               if (location) {
-                   coordItem = list
-                       .append('li')
-                       .text(_t('info_panels.measurement.location') + ':');
-                   coordItem.append('span')
-                       .text(dmsCoordinatePair(location));
-                   coordItem.append('span')
-                       .text(decimalCoordinatePair(location));
-               }
-
-               if (centroid) {
-                   coordItem = list
-                       .append('li')
-                       .text(_t('info_panels.measurement.centroid') + ':');
-                   coordItem.append('span')
-                       .text(dmsCoordinatePair(centroid));
-                   coordItem.append('span')
-                       .text(decimalCoordinatePair(centroid));
-               }
-
-               if (center) {
-                   coordItem = list
-                       .append('li')
-                       .text(_t('info_panels.measurement.center') + ':');
-                   coordItem.append('span')
-                       .text(dmsCoordinatePair(center));
-                   coordItem.append('span')
-                       .text(decimalCoordinatePair(center));
-               }
-
-               if (length || area) {
-                   var toggle  = isImperial ? 'imperial' : 'metric';
-                   selection
-                       .append('a')
-                       .text(_t('info_panels.measurement.' + toggle))
-                       .attr('href', '#')
-                       .attr('class', 'button button-toggle-units')
-                       .on('click', function() {
-                           event.preventDefault();
-                           isImperial = !isImperial;
-                           selection.call(redraw);
-                       });
+           function pushPassive(start, end, index) {
+             features.passive.push({
+               type: 'Feature',
+               id: way.id + '-' + index,
+               properties: {
+                 target: true,
+                 entity: way,
+                 nodes: [start.node, end.node],
+                 index: index
+               },
+               geometry: {
+                 type: 'LineString',
+                 coordinates: [start.node.loc, end.node.loc]
                }
+             });
            }
+         }
+       }
 
+       function svgTagClasses() {
+         var primaries = ['building', 'highway', 'railway', 'waterway', 'aeroway', 'aerialway', 'piste:type', 'boundary', 'power', 'amenity', 'natural', 'landuse', 'leisure', 'military', 'place', 'man_made', 'route', 'attraction', 'building:part', 'indoor'];
+         var statuses = [// nonexistent, might be built
+         'proposed', 'planned', // under maintentance or between groundbreaking and opening
+         'construction', // existent but not functional
+         'disused', // dilapidated to nonexistent
+         'abandoned', // nonexistent, still may appear in imagery
+         'dismantled', 'razed', 'demolished', 'obliterated', // existent occasionally, e.g. stormwater drainage basin
+         'intermittent'];
+         var secondaries = ['oneway', 'bridge', 'tunnel', 'embankment', 'cutting', 'barrier', 'surface', 'tracktype', 'footway', 'crossing', 'service', 'sport', 'public_transport', 'location', 'parking', 'golf', 'type', 'leisure', 'man_made', 'indoor'];
 
-           var panel = function(selection) {
-               selection.call(redraw);
-
-               context.map()
-                   .on('drawn.info-measurement', function() {
-                       selection.call(redraw);
-                   });
-
-               context
-                   .on('enter.info-measurement', function() {
-                       selection.call(redraw);
-                   });
-           };
-
-           panel.off = function() {
-               context.map().on('drawn.info-measurement', null);
-               context.on('enter.info-measurement', null);
-           };
+         var _tags = function _tags(entity) {
+           return entity.tags;
+         };
 
-           panel.id = 'measurement';
-           panel.title = _t('info_panels.measurement.title');
-           panel.key = _t('info_panels.measurement.key');
+         var tagClasses = function tagClasses(selection) {
+           selection.each(function tagClassesEach(entity) {
+             var value = this.className;
 
+             if (value.baseVal !== undefined) {
+               value = value.baseVal;
+             }
 
-           return panel;
-       }
+             var t = _tags(entity);
 
-       var uiInfoPanels = {
-           background: uiPanelBackground,
-           history: uiPanelHistory,
-           location: uiPanelLocation,
-           measurement: uiPanelMeasurement,
-       };
+             var computed = tagClasses.getClassesString(t, value);
 
-       function uiInfo(context) {
-           var ids = Object.keys(uiInfoPanels);
-           var wasActive = ['measurement'];
-           var panels = {};
-           var active = {};
-
-           // create panels
-           ids.forEach(function(k) {
-               if (!panels[k]) {
-                   panels[k] = uiInfoPanels[k](context);
-                   active[k] = false;
-               }
+             if (computed !== value) {
+               select(this).attr('class', computed);
+             }
            });
+         };
 
+         tagClasses.getClassesString = function (t, value) {
+           var primary, status;
+           var i, j, k, v; // in some situations we want to render perimeter strokes a certain way
 
-           function info(selection) {
-
-               function redraw() {
-                   var activeids = ids.filter(function(k) { return active[k]; }).sort();
+           var overrideGeometry;
 
-                   var containers = infoPanels.selectAll('.panel-container')
-                       .data(activeids, function(k) { return k; });
+           if (/\bstroke\b/.test(value)) {
+             if (!!t.barrier && t.barrier !== 'no') {
+               overrideGeometry = 'line';
+             }
+           } // preserve base classes (nothing with `tag-`)
 
-                   containers.exit()
-                       .style('opacity', 1)
-                       .transition()
-                       .duration(200)
-                       .style('opacity', 0)
-                       .on('end', function(d) {
-                           select(this)
-                               .call(panels[d].off)
-                               .remove();
-                       });
 
-                   var enter = containers.enter()
-                       .append('div')
-                       .attr('class', function(d) { return 'fillD2 panel-container panel-container-' + d; });
+           var classes = value.trim().split(/\s+/).filter(function (klass) {
+             return klass.length && !/^tag-/.test(klass);
+           }).map(function (klass) {
+             // special overrides for some perimeter strokes
+             return klass === 'line' || klass === 'area' ? overrideGeometry || klass : klass;
+           }); // pick at most one primary classification tag..
 
-                   enter
-                       .style('opacity', 0)
-                       .transition()
-                       .duration(200)
-                       .style('opacity', 1);
+           for (i = 0; i < primaries.length; i++) {
+             k = primaries[i];
+             v = t[k];
+             if (!v || v === 'no') continue;
 
-                   var title = enter
-                       .append('div')
-                       .attr('class', 'panel-title fillD2');
+             if (k === 'piste:type') {
+               // avoid a ':' in the class name
+               k = 'piste';
+             } else if (k === 'building:part') {
+               // avoid a ':' in the class name
+               k = 'building_part';
+             }
 
-                   title
-                       .append('h3')
-                       .text(function(d) { return panels[d].title; });
+             primary = k;
 
-                   title
-                       .append('button')
-                       .attr('class', 'close')
-                       .on('click', function (d) { info.toggle(d); })
-                       .call(svgIcon('#iD-icon-close'));
+             if (statuses.indexOf(v) !== -1) {
+               // e.g. `railway=abandoned`
+               status = v;
+               classes.push('tag-' + k);
+             } else {
+               classes.push('tag-' + k);
+               classes.push('tag-' + k + '-' + v);
+             }
 
-                   enter
-                       .append('div')
-                       .attr('class', function(d) { return 'panel-content panel-content-' + d; });
+             break;
+           }
 
+           if (!primary) {
+             for (i = 0; i < statuses.length; i++) {
+               for (j = 0; j < primaries.length; j++) {
+                 k = statuses[i] + ':' + primaries[j]; // e.g. `demolished:building=yes`
 
-                   // redraw the panels
-                   infoPanels.selectAll('.panel-content')
-                       .each(function(d) {
-                           select(this).call(panels[d]);
-                       });
+                 v = t[k];
+                 if (!v || v === 'no') continue;
+                 status = statuses[i];
+                 break;
                }
+             }
+           } // add at most one status tag, only if relates to primary tag..
 
 
-               info.toggle = function(which) {
-                   if (event) {
-                       event.stopImmediatePropagation();
-                       event.preventDefault();
-                   }
+           if (!status) {
+             for (i = 0; i < statuses.length; i++) {
+               k = statuses[i];
+               v = t[k];
+               if (!v || v === 'no') continue;
 
-                   var activeids = ids.filter(function(k) { return active[k]; });
+               if (v === 'yes') {
+                 // e.g. `railway=rail + abandoned=yes`
+                 status = k;
+               } else if (primary && primary === v) {
+                 // e.g. `railway=rail + abandoned=railway`
+                 status = k;
+               } else if (!primary && primaries.indexOf(v) !== -1) {
+                 // e.g. `abandoned=railway`
+                 status = k;
+                 primary = v;
+                 classes.push('tag-' + v);
+               } // else ignore e.g.  `highway=path + abandoned=railway`
 
-                   if (which) {  // toggle one
-                       active[which] = !active[which];
-                       if (activeids.length === 1 && activeids[0] === which) {  // none active anymore
-                           wasActive = [which];
-                       }
 
-                       context.container().select('.' + which + '-panel-toggle-item')
-                           .classed('active', active[which])
-                           .select('input')
-                           .property('checked', active[which]);
-
-                   } else {      // toggle all
-                       if (activeids.length) {
-                           wasActive = activeids;
-                           activeids.forEach(function(k) { active[k] = false; });
-                       } else {
-                           wasActive.forEach(function(k) { active[k] = true; });
-                       }
-                   }
+               if (status) break;
+             }
+           }
 
-                   redraw();
-               };
+           if (status) {
+             classes.push('tag-status');
+             classes.push('tag-status-' + status);
+           } // add any secondary tags
 
 
-               var infoPanels = selection.selectAll('.info-panels')
-                   .data([0]);
+           for (i = 0; i < secondaries.length; i++) {
+             k = secondaries[i];
+             v = t[k];
+             if (!v || v === 'no' || k === primary) continue;
+             classes.push('tag-' + k);
+             classes.push('tag-' + k + '-' + v);
+           } // For highways, look for surface tagging..
 
-               infoPanels = infoPanels.enter()
-                   .append('div')
-                   .attr('class', 'info-panels')
-                   .merge(infoPanels);
 
-               redraw();
+           if (primary === 'highway' && !osmPathHighwayTagValues[t.highway] || primary === 'aeroway') {
+             var surface = t.highway === 'track' ? 'unpaved' : 'paved';
 
-               context.keybinding()
-                   .on(uiCmd('⌘' + _t('info_panels.key')), info.toggle);
+             for (k in t) {
+               v = t[k];
 
-               ids.forEach(function(k) {
-                   var key = _t('info_panels.' + k + '.key', { default: null });
-                   if (!key) return;
-                   context.keybinding()
-                       .on(uiCmd('⌘⇧' + key), function() { info.toggle(k); });
-               });
-           }
+               if (k in osmPavedTags) {
+                 surface = osmPavedTags[k][v] ? 'paved' : 'unpaved';
+               }
 
-           return info;
-       }
+               if (k in osmSemipavedTags && !!osmSemipavedTags[k][v]) {
+                 surface = 'semipaved';
+               }
+             }
 
-       function pointBox(loc, context) {
-           var rect = context.surfaceRect();
-           var point = context.curtainProjection(loc);
-           return {
-               left: point[0] + rect.left - 40,
-               top: point[1] + rect.top - 60,
-               width: 80,
-               height: 90
-           };
-       }
+             classes.push('tag-' + surface);
+           } // If this is a wikidata-tagged item, add a class for that..
 
 
-       function pad(locOrBox, padding, context) {
-           var box;
-           if (locOrBox instanceof Array) {
-               var rect = context.surfaceRect();
-               var point = context.curtainProjection(locOrBox);
-               box = {
-                   left: point[0] + rect.left,
-                   top: point[1] + rect.top
-               };
-           } else {
-               box = locOrBox;
+           if (t.wikidata || t['brand:wikidata']) {
+             classes.push('tag-wikidata');
            }
 
-           return {
-               left: box.left - padding,
-               top: box.top - padding,
-               width: (box.width || 0) + 2 * padding,
-               height: (box.width || 0) + 2 * padding
-           };
-       }
+           return classes.join(' ').trim();
+         };
 
+         tagClasses.tags = function (val) {
+           if (!arguments.length) return _tags;
+           _tags = val;
+           return tagClasses;
+         };
 
-       function icon(name, svgklass, useklass) {
-           return '<svg class="icon ' + (svgklass || '') + '">' +
-                '<use xlink:href="' + name + '"' +
-                (useklass ? ' class="' + useklass + '"' : '') + '></use></svg>';
+         return tagClasses;
        }
 
-       var helpStringReplacements;
+       // Patterns only work in Firefox when set directly on element.
+       // (This is not a bug: https://bugzilla.mozilla.org/show_bug.cgi?id=750632)
+       var patterns = {
+         // tag - pattern name
+         // -or-
+         // tag - value - pattern name
+         // -or-
+         // tag - value - rules (optional tag-values, pattern name)
+         // (matches earlier rules first, so fallback should be last entry)
+         amenity: {
+           grave_yard: 'cemetery',
+           fountain: 'water_standing'
+         },
+         landuse: {
+           cemetery: [{
+             religion: 'christian',
+             pattern: 'cemetery_christian'
+           }, {
+             religion: 'buddhist',
+             pattern: 'cemetery_buddhist'
+           }, {
+             religion: 'muslim',
+             pattern: 'cemetery_muslim'
+           }, {
+             religion: 'jewish',
+             pattern: 'cemetery_jewish'
+           }, {
+             pattern: 'cemetery'
+           }],
+           construction: 'construction',
+           farmland: 'farmland',
+           farmyard: 'farmyard',
+           forest: [{
+             leaf_type: 'broadleaved',
+             pattern: 'forest_broadleaved'
+           }, {
+             leaf_type: 'needleleaved',
+             pattern: 'forest_needleleaved'
+           }, {
+             leaf_type: 'leafless',
+             pattern: 'forest_leafless'
+           }, {
+             pattern: 'forest'
+           } // same as 'leaf_type:mixed'
+           ],
+           grave_yard: 'cemetery',
+           grass: [{
+             golf: 'green',
+             pattern: 'golf_green'
+           }, {
+             pattern: 'grass'
+           }],
+           landfill: 'landfill',
+           meadow: 'meadow',
+           military: 'construction',
+           orchard: 'orchard',
+           quarry: 'quarry',
+           vineyard: 'vineyard'
+         },
+         natural: {
+           beach: 'beach',
+           grassland: 'grass',
+           sand: 'beach',
+           scrub: 'scrub',
+           water: [{
+             water: 'pond',
+             pattern: 'pond'
+           }, {
+             water: 'reservoir',
+             pattern: 'water_standing'
+           }, {
+             pattern: 'waves'
+           }],
+           wetland: [{
+             wetland: 'marsh',
+             pattern: 'wetland_marsh'
+           }, {
+             wetland: 'swamp',
+             pattern: 'wetland_swamp'
+           }, {
+             wetland: 'bog',
+             pattern: 'wetland_bog'
+           }, {
+             wetland: 'reedbed',
+             pattern: 'wetland_reedbed'
+           }, {
+             pattern: 'wetland'
+           }],
+           wood: [{
+             leaf_type: 'broadleaved',
+             pattern: 'forest_broadleaved'
+           }, {
+             leaf_type: 'needleleaved',
+             pattern: 'forest_needleleaved'
+           }, {
+             leaf_type: 'leafless',
+             pattern: 'forest_leafless'
+           }, {
+             pattern: 'forest'
+           } // same as 'leaf_type:mixed'
+           ]
+         },
+         traffic_calming: {
+           island: [{
+             surface: 'grass',
+             pattern: 'grass'
+           }],
+           chicane: [{
+             surface: 'grass',
+             pattern: 'grass'
+           }],
+           choker: [{
+             surface: 'grass',
+             pattern: 'grass'
+           }]
+         }
+       };
+       function svgTagPattern(tags) {
+         // Skip pattern filling if this is a building (buildings don't get patterns applied)
+         if (tags.building && tags.building !== 'no') {
+           return null;
+         }
 
-       // Returns the localized string for `id` with a standardized set of icon, key, and
-       // label replacements suitable for tutorials and documentation. Optionally supplemented
-       // with custom `replacements`
-       function helpString(id, replacements) {
-           // only load these the first time
-           if (!helpStringReplacements) helpStringReplacements = {
-               // insert icons corresponding to various UI elements
-               point_icon: icon('#iD-icon-point', 'pre-text'),
-               line_icon: icon('#iD-icon-line', 'pre-text'),
-               area_icon: icon('#iD-icon-area', 'pre-text'),
-               note_icon: icon('#iD-icon-note', 'pre-text add-note'),
-               plus: icon('#iD-icon-plus', 'pre-text'),
-               minus: icon('#iD-icon-minus', 'pre-text'),
-               move_icon: icon('#iD-operation-move', 'pre-text operation'),
-               merge_icon: icon('#iD-operation-merge', 'pre-text operation'),
-               delete_icon: icon('#iD-operation-delete', 'pre-text operation'),
-               circularize_icon: icon('#iD-operation-circularize', 'pre-text operation'),
-               split_icon: icon('#iD-operation-split', 'pre-text operation'),
-               orthogonalize_icon: icon('#iD-operation-orthogonalize', 'pre-text operation'),
-               disconnect_icon: icon('#iD-operation-disconnect', 'pre-text operation'),
-               layers_icon: icon('#iD-icon-layers', 'pre-text'),
-               data_icon: icon('#iD-icon-data', 'pre-text'),
-               inspect: icon('#iD-icon-inspect', 'pre-text'),
-               help_icon: icon('#iD-icon-help', 'pre-text'),
-               undo_icon: icon(_mainLocalizer.textDirection() === 'rtl' ? '#iD-icon-redo' : '#iD-icon-undo', 'pre-text'),
-               redo_icon: icon(_mainLocalizer.textDirection() === 'rtl' ? '#iD-icon-undo' : '#iD-icon-redo', 'pre-text'),
-               save_icon: icon('#iD-icon-save', 'pre-text'),
-               leftclick: icon('#iD-walkthrough-mouse-left', 'pre-text operation'),
-               rightclick: icon('#iD-walkthrough-mouse-right', 'pre-text operation'),
-               mousewheel_icon: icon('#iD-walkthrough-mousewheel', 'pre-text operation'),
-               tap_icon: icon('#iD-walkthrough-tap', 'pre-text operation'),
-               doubletap_icon: icon('#iD-walkthrough-doubletap', 'pre-text operation'),
-               longpress_icon: icon('#iD-walkthrough-longpress', 'pre-text operation'),
-               touchdrag_icon: icon('#iD-walkthrough-touchdrag', 'pre-text operation'),
-               pinch_icon: icon('#iD-walkthrough-pinch-apart', 'pre-text operation'),
-
-               // insert keys; may be localized and platform-dependent
-               shift: uiCmd.display('⇧'),
-               alt: uiCmd.display('⌥'),
-               return: uiCmd.display('↵'),
-               esc: _t('shortcuts.key.esc'),
-               space: _t('shortcuts.key.space'),
-               add_note_key: _t('modes.add_note.key'),
-               help_key: _t('help.key'),
-               shortcuts_key: _t('shortcuts.toggle.key'),
-
-               // reference localized UI labels directly so that they'll always match
-               save: _t('save.title'),
-               undo: _t('undo.title'),
-               redo: _t('redo.title'),
-               upload: _t('commit.save'),
-               point: _t('modes.add_point.title'),
-               line: _t('modes.add_line.title'),
-               area: _t('modes.add_area.title'),
-               note: _t('modes.add_note.title'),
-               delete: _t('operations.delete.title'),
-               move: _t('operations.move.title'),
-               orthogonalize: _t('operations.orthogonalize.title'),
-               circularize: _t('operations.circularize.title'),
-               merge: _t('operations.merge.title'),
-               disconnect: _t('operations.disconnect.title'),
-               split: _t('operations.split.title'),
-               map_data: _t('map_data.title'),
-               osm_notes: _t('map_data.layers.notes.title'),
-               fields: _t('inspector.fields'),
-               tags: _t('inspector.tags'),
-               relations: _t('inspector.relations'),
-               new_relation: _t('inspector.new_relation'),
-               turn_restrictions: _t('presets.fields.restrictions.label'),
-               background_settings: _t('background.description'),
-               imagery_offset: _t('background.fix_misalignment'),
-               start_the_walkthrough: _t('splash.walkthrough'),
-               help: _t('help.title'),
-               ok: _t('intro.ok')
-           };
+         for (var tag in patterns) {
+           var entityValue = tags[tag];
+           if (!entityValue) continue;
 
-           var reps;
-           if (replacements) {
-               reps = Object.assign(replacements, helpStringReplacements);
+           if (typeof patterns[tag] === 'string') {
+             // extra short syntax (just tag) - pattern name
+             return 'pattern-' + patterns[tag];
            } else {
-               reps = helpStringReplacements;
-           }
-
-           return _t(id, reps)
-                // use keyboard key styling for shortcuts
-               .replace(/\`(.*?)\`/g, '<kbd>$1</kbd>');
-       }
-
+             var values = patterns[tag];
 
-       function slugify(text) {
-           return text.toString().toLowerCase()
-               .replace(/\s+/g, '-')           // Replace spaces with -
-               .replace(/[^\w\-]+/g, '')       // Remove all non-word chars
-               .replace(/\-\-+/g, '-')         // Replace multiple - with single -
-               .replace(/^-+/, '')             // Trim - from start of text
-               .replace(/-+$/, '');            // Trim - from end of text
-       }
+             for (var value in values) {
+               if (entityValue !== value) continue;
+               var rules = values[value];
 
+               if (typeof rules === 'string') {
+                 // short syntax - pattern name
+                 return 'pattern-' + rules;
+               } // long syntax - rule array
 
-       // console warning for missing walkthrough names
-       var missingStrings = {};
-       function checkKey(key, text) {
-           if (_t(key, { default: undefined}) === undefined) {
-               if (missingStrings.hasOwnProperty(key)) return;  // warn once
-               missingStrings[key] = text;
-               var missing = key + ': ' + text;
-               if (typeof console !== 'undefined') console.log(missing); // eslint-disable-line
-           }
-       }
 
+               for (var ruleKey in rules) {
+                 var rule = rules[ruleKey];
+                 var pass = true;
 
-       function localize(obj) {
-           var key;
+                 for (var criterion in rule) {
+                   if (criterion !== 'pattern') {
+                     // reserved for pattern name
+                     // The only rule is a required tag-value pair
+                     var v = tags[criterion];
 
-           // Assign name if entity has one..
-           var name = obj.tags && obj.tags.name;
-           if (name) {
-               key = 'intro.graph.name.' + slugify(name);
-               obj.tags.name = _t(key, { default: name });
-               checkKey(key, name);
-           }
-
-           // Assign street name if entity has one..
-           var street = obj.tags && obj.tags['addr:street'];
-           if (street) {
-               key = 'intro.graph.name.' + slugify(street);
-               obj.tags['addr:street'] = _t(key, { default: street });
-               checkKey(key, street);
-
-               // Add address details common across walkthrough..
-               var addrTags = [
-                   'block_number', 'city', 'county', 'district', 'hamlet', 'neighbourhood',
-                   'postcode', 'province', 'quarter', 'state', 'subdistrict', 'suburb'
-               ];
-               addrTags.forEach(function(k) {
-                   var key = 'intro.graph.' + k;
-                   var tag = 'addr:' + k;
-                   var val = obj.tags && obj.tags[tag];
-                   var str = _t(key, { default: val });
-
-                   if (str) {
-                       if (str.match(/^<.*>$/) !== null) {
-                           delete obj.tags[tag];
-                       } else {
-                           obj.tags[tag] = str;
-                       }
+                     if (!v || v !== rule[criterion]) {
+                       pass = false;
+                       break;
+                     }
                    }
-               });
-           }
-
-           return obj;
-       }
-
-
-       // Used to detect squareness.. some duplicataion of code from actionOrthogonalize.
-       function isMostlySquare(points) {
-           // note: uses 15 here instead of the 12 from actionOrthogonalize because
-           // actionOrthogonalize can actually straighten some larger angles as it iterates
-           var threshold = 15; // degrees within right or straight
-           var lowerBound = Math.cos((90 - threshold) * Math.PI / 180);  // near right
-           var upperBound = Math.cos(threshold * Math.PI / 180);         // near straight
-
-           for (var i = 0; i < points.length; i++) {
-               var a = points[(i - 1 + points.length) % points.length];
-               var origin = points[i];
-               var b = points[(i + 1) % points.length];
+                 }
 
-               var dotp = geoVecNormalizedDot(a, b, origin);
-               var mag = Math.abs(dotp);
-               if (mag > lowerBound && mag < upperBound) {
-                   return false;
+                 if (pass) {
+                   return 'pattern-' + rule.pattern;
+                 }
                }
+             }
            }
+         }
 
-           return true;
-       }
-
-
-       function selectMenuItem(context, operation) {
-           return context.container().select('.edit-menu .edit-menu-item-' + operation);
-       }
-
-
-       function transitionTime(point1, point2) {
-           var distance = geoSphericalDistance(point1, point2);
-           if (distance === 0)
-               return 0;
-           else if (distance < 80)
-               return 500;
-           else
-               return 1000;
+         return null;
        }
 
-       // Tooltips and svg mask used to highlight certain features
-       function uiCurtain(containerNode) {
+       function svgAreas(projection, context) {
+         function getPatternStyle(tags) {
+           var imageID = svgTagPattern(tags);
 
-           var surface = select(null),
-               tooltip = select(null),
-               darkness = select(null);
+           if (imageID) {
+             return 'url("#ideditor-' + imageID + '")';
+           }
 
-           function curtain(selection) {
-               surface = selection
-                   .append('svg')
-                   .attr('class', 'curtain')
-                   .style('top', 0)
-                   .style('left', 0);
+           return '';
+         }
 
-               darkness = surface.append('path')
-                   .attr('x', 0)
-                   .attr('y', 0)
-                   .attr('class', 'curtain-darkness');
+         function drawTargets(selection, graph, entities, filter) {
+           var targetClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
+           var nopeClass = context.getDebug('target') ? 'red ' : 'nocolor ';
+           var getPath = svgPath(projection).geojson;
+           var activeID = context.activeID();
+           var base = context.history().base(); // The targets and nopes will be MultiLineString sub-segments of the ways
 
-               select(window).on('resize.curtain', resize);
+           var data = {
+             targets: [],
+             nopes: []
+           };
+           entities.forEach(function (way) {
+             var features = svgSegmentWay(way, graph, activeID);
+             data.targets.push.apply(data.targets, features.passive);
+             data.nopes.push.apply(data.nopes, features.active);
+           }); // Targets allow hover and vertex snapping
 
-               tooltip = selection.append('div')
-                   .attr('class', 'tooltip');
+           var targetData = data.targets.filter(getPath);
+           var targets = selection.selectAll('.area.target-allowed').filter(function (d) {
+             return filter(d.properties.entity);
+           }).data(targetData, function key(d) {
+             return d.id;
+           }); // exit
 
-               tooltip
-                   .append('div')
-                   .attr('class', 'popover-arrow');
+           targets.exit().remove();
 
-               tooltip
-                   .append('div')
-                   .attr('class', 'popover-inner');
+           var segmentWasEdited = function segmentWasEdited(d) {
+             var wayID = d.properties.entity.id; // if the whole line was edited, don't draw segment changes
 
-               resize();
+             if (!base.entities[wayID] || !fastDeepEqual(graph.entities[wayID].nodes, base.entities[wayID].nodes)) {
+               return false;
+             }
 
+             return d.properties.nodes.some(function (n) {
+               return !base.entities[n.id] || !fastDeepEqual(graph.entities[n.id].loc, base.entities[n.id].loc);
+             });
+           }; // enter/update
 
-               function resize() {
-                   surface
-                       .attr('width', containerNode.clientWidth)
-                       .attr('height', containerNode.clientHeight);
-                   curtain.cut(darkness.datum());
-               }
-           }
 
+           targets.enter().append('path').merge(targets).attr('d', getPath).attr('class', function (d) {
+             return 'way area target target-allowed ' + targetClass + d.id;
+           }).classed('segment-edited', segmentWasEdited); // NOPE
 
-           /**
-            * Reveal cuts the curtain to highlight the given box,
-            * and shows a tooltip with instructions next to the box.
-            *
-            * @param  {String|ClientRect} [box]   box used to cut the curtain
-            * @param  {String}    [text]          text for a tooltip
-            * @param  {Object}    [options]
-            * @param  {string}    [options.tooltipClass]    optional class to add to the tooltip
-            * @param  {integer}   [options.duration]        transition time in milliseconds
-            * @param  {string}    [options.buttonText]      if set, create a button with this text label
-            * @param  {function}  [options.buttonCallback]  if set, the callback for the button
-            * @param  {function}  [options.padding]         extra margin in px to put around bbox
-            * @param  {String|ClientRect} [options.tooltipBox]  box for tooltip position, if different from box for the curtain
-            */
-           curtain.reveal = function(box, text, options) {
-               options = options || {};
-
-               if (typeof box === 'string') {
-                   box = select(box).node();
-               }
-               if (box && box.getBoundingClientRect) {
-                   box = copyBox(box.getBoundingClientRect());
-                   var containerRect = containerNode.getBoundingClientRect();
-                   box.top -= containerRect.top;
-                   box.left -= containerRect.left;
-               }
-               if (box && options.padding) {
-                   box.top -= options.padding;
-                   box.left -= options.padding;
-                   box.bottom += options.padding;
-                   box.right += options.padding;
-                   box.height += options.padding * 2;
-                   box.width += options.padding * 2;
-               }
-
-               var tooltipBox;
-               if (options.tooltipBox) {
-                   tooltipBox = options.tooltipBox;
-                   if (typeof tooltipBox === 'string') {
-                       tooltipBox = select(tooltipBox).node();
-                   }
-                   if (tooltipBox && tooltipBox.getBoundingClientRect) {
-                       tooltipBox = copyBox(tooltipBox.getBoundingClientRect());
-                   }
-               } else {
-                   tooltipBox = box;
-               }
+           var nopeData = data.nopes.filter(getPath);
+           var nopes = selection.selectAll('.area.target-nope').filter(function (d) {
+             return filter(d.properties.entity);
+           }).data(nopeData, function key(d) {
+             return d.id;
+           }); // exit
 
-               if (tooltipBox && text) {
-                   // pseudo markdown bold text for the instruction section..
-                   var parts = text.split('**');
-                   var html = parts[0] ? '<span>' + parts[0] + '</span>' : '';
-                   if (parts[1]) {
-                       html += '<span class="instruction">' + parts[1] + '</span>';
-                   }
+           nopes.exit().remove(); // enter/update
 
-                   html = html.replace(/\*(.*?)\*/g, '<em>$1</em>');   // emphasis
-                   html = html.replace(/\{br\}/g, '<br/><br/>');       // linebreak
+           nopes.enter().append('path').merge(nopes).attr('d', getPath).attr('class', function (d) {
+             return 'way area target target-nope ' + nopeClass + d.id;
+           }).classed('segment-edited', segmentWasEdited);
+         }
 
-                   if (options.buttonText && options.buttonCallback) {
-                       html += '<div class="button-section">' +
-                           '<button href="#" class="button action">' + options.buttonText + '</button></div>';
-                   }
+         function drawAreas(selection, graph, entities, filter) {
+           var path = svgPath(projection, graph, true);
+           var areas = {};
+           var multipolygon;
+           var base = context.history().base();
 
-                   var classes = 'curtain-tooltip popover tooltip arrowed in ' + (options.tooltipClass || '');
-                   tooltip
-                       .classed(classes, true)
-                       .selectAll('.popover-inner')
-                       .html(html);
-
-                   if (options.buttonText && options.buttonCallback) {
-                       var button = tooltip.selectAll('.button-section .button.action');
-                       button
-                           .on('click', function() {
-                               event.preventDefault();
-                               options.buttonCallback();
-                           });
-                   }
+           for (var i = 0; i < entities.length; i++) {
+             var entity = entities[i];
+             if (entity.geometry(graph) !== 'area') continue;
+             multipolygon = osmIsOldMultipolygonOuterMember(entity, graph);
 
-                   var tip = copyBox(tooltip.node().getBoundingClientRect()),
-                       w = containerNode.clientWidth,
-                       h = containerNode.clientHeight,
-                       tooltipWidth = 200,
-                       tooltipArrow = 5,
-                       side, pos;
+             if (multipolygon) {
+               areas[multipolygon.id] = {
+                 entity: multipolygon.mergeTags(entity.tags),
+                 area: Math.abs(entity.area(graph))
+               };
+             } else if (!areas[entity.id]) {
+               areas[entity.id] = {
+                 entity: entity,
+                 area: Math.abs(entity.area(graph))
+               };
+             }
+           }
 
+           var fills = Object.values(areas).filter(function hasPath(a) {
+             return path(a.entity);
+           });
+           fills.sort(function areaSort(a, b) {
+             return b.area - a.area;
+           });
+           fills = fills.map(function (a) {
+             return a.entity;
+           });
+           var strokes = fills.filter(function (area) {
+             return area.type === 'way';
+           });
+           var data = {
+             clip: fills,
+             shadow: strokes,
+             stroke: strokes,
+             fill: fills
+           };
+           var clipPaths = context.surface().selectAll('defs').selectAll('.clipPath-osm').filter(filter).data(data.clip, osmEntity.key);
+           clipPaths.exit().remove();
+           var clipPathsEnter = clipPaths.enter().append('clipPath').attr('class', 'clipPath-osm').attr('id', function (entity) {
+             return 'ideditor-' + entity.id + '-clippath';
+           });
+           clipPathsEnter.append('path');
+           clipPaths.merge(clipPathsEnter).selectAll('path').attr('d', path);
+           var drawLayer = selection.selectAll('.layer-osm.areas');
+           var touchLayer = selection.selectAll('.layer-touch.areas'); // Draw areas..
 
-                   // hack: this will have bottom placement,
-                   // so need to reserve extra space for the tooltip illustration.
-                   if (options.tooltipClass === 'intro-mouse') {
-                       tip.height += 80;
-                   }
+           var areagroup = drawLayer.selectAll('g.areagroup').data(['fill', 'shadow', 'stroke']);
+           areagroup = areagroup.enter().append('g').attr('class', function (d) {
+             return 'areagroup area-' + d;
+           }).merge(areagroup);
+           var paths = areagroup.selectAll('path').filter(filter).data(function (layer) {
+             return data[layer];
+           }, osmEntity.key);
+           paths.exit().remove();
+           var fillpaths = selection.selectAll('.area-fill path.area').nodes();
+           var bisect = d3_bisector(function (node) {
+             return -node.__data__.area(graph);
+           }).left;
 
-                   // trim box dimensions to just the portion that fits in the container..
-                   if (tooltipBox.top + tooltipBox.height > h) {
-                       tooltipBox.height -= (tooltipBox.top + tooltipBox.height - h);
-                   }
-                   if (tooltipBox.left + tooltipBox.width > w) {
-                       tooltipBox.width -= (tooltipBox.left + tooltipBox.width - w);
-                   }
+           function sortedByArea(entity) {
+             if (this._parent.__data__ === 'fill') {
+               return fillpaths[bisect(fillpaths, -entity.area(graph))];
+             }
+           }
 
-                   // determine tooltip placement..
+           paths = paths.enter().insert('path', sortedByArea).merge(paths).each(function (entity) {
+             var layer = this.parentNode.__data__;
+             this.setAttribute('class', entity.type + ' area ' + layer + ' ' + entity.id);
 
-                   if (tooltipBox.top + tooltipBox.height < 100) {
-                       // tooltip below box..
-                       side = 'bottom';
-                       pos = [
-                           tooltipBox.left + tooltipBox.width / 2 - tip.width / 2,
-                           tooltipBox.top + tooltipBox.height
-                       ];
+             if (layer === 'fill') {
+               this.setAttribute('clip-path', 'url(#ideditor-' + entity.id + '-clippath)');
+               this.style.fill = this.style.stroke = getPatternStyle(entity.tags);
+             }
+           }).classed('added', function (d) {
+             return !base.entities[d.id];
+           }).classed('geometry-edited', function (d) {
+             return graph.entities[d.id] && base.entities[d.id] && !fastDeepEqual(graph.entities[d.id].nodes, base.entities[d.id].nodes);
+           }).classed('retagged', function (d) {
+             return graph.entities[d.id] && base.entities[d.id] && !fastDeepEqual(graph.entities[d.id].tags, base.entities[d.id].tags);
+           }).call(svgTagClasses()).attr('d', path); // Draw touch targets..
 
-                   } else if (tooltipBox.top > h - 140) {
-                       // tooltip above box..
-                       side = 'top';
-                       pos = [
-                           tooltipBox.left + tooltipBox.width / 2 - tip.width / 2,
-                           tooltipBox.top - tip.height
-                       ];
+           touchLayer.call(drawTargets, graph, data.stroke, filter);
+         }
 
-                   } else {
-                       // tooltip to the side of the tooltipBox..
-                       var tipY = tooltipBox.top + tooltipBox.height / 2 - tip.height / 2;
+         return drawAreas;
+       }
 
-                       if (_mainLocalizer.textDirection() === 'rtl') {
-                           if (tooltipBox.left - tooltipWidth - tooltipArrow < 70) {
-                               side = 'right';
-                               pos = [tooltipBox.left + tooltipBox.width + tooltipArrow, tipY];
+       //[4]           NameStartChar      ::=          ":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6] | [#xD8-#xF6] | [#xF8-#x2FF] | [#x370-#x37D] | [#x37F-#x1FFF] | [#x200C-#x200D] | [#x2070-#x218F] | [#x2C00-#x2FEF] | [#x3001-#xD7FF] | [#xF900-#xFDCF] | [#xFDF0-#xFFFD] | [#x10000-#xEFFFF]
+       //[4a]          NameChar           ::=          NameStartChar | "-" | "." | [0-9] | #xB7 | [#x0300-#x036F] | [#x203F-#x2040]
+       //[5]           Name       ::=          NameStartChar (NameChar)*
+       var nameStartChar = /[A-Z_a-z\xC0-\xD6\xD8-\xF6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD]/; //\u10000-\uEFFFF
 
-                           } else {
-                               side = 'left';
-                               pos = [tooltipBox.left - tooltipWidth - tooltipArrow, tipY];
-                           }
+       var nameChar = new RegExp("[\\-\\.0-9" + nameStartChar.source.slice(1, -1) + "\\u00B7\\u0300-\\u036F\\u203F-\\u2040]");
+       var tagNamePattern = new RegExp('^' + nameStartChar.source + nameChar.source + '*(?:\:' + nameStartChar.source + nameChar.source + '*)?$'); //var tagNamePattern = /^[a-zA-Z_][\w\-\.]*(?:\:[a-zA-Z_][\w\-\.]*)?$/
+       //var handlers = 'resolveEntity,getExternalSubset,characters,endDocument,endElement,endPrefixMapping,ignorableWhitespace,processingInstruction,setDocumentLocator,skippedEntity,startDocument,startElement,startPrefixMapping,notationDecl,unparsedEntityDecl,error,fatalError,warning,attributeDecl,elementDecl,externalEntityDecl,internalEntityDecl,comment,endCDATA,endDTD,endEntity,startCDATA,startDTD,startEntity'.split(',')
+       //S_TAG,        S_ATTR, S_EQ,   S_ATTR_NOQUOT_VALUE
+       //S_ATTR_SPACE, S_ATTR_END,     S_TAG_SPACE, S_TAG_CLOSE
 
-                       } else {
-                           if (tooltipBox.left + tooltipBox.width + tooltipArrow + tooltipWidth > w - 70) {
-                               side = 'left';
-                               pos = [tooltipBox.left - tooltipWidth - tooltipArrow, tipY];
-                           }
-                           else {
-                               side = 'right';
-                               pos = [tooltipBox.left + tooltipBox.width + tooltipArrow, tipY];
-                           }
-                       }
-                   }
+       var S_TAG = 0; //tag name offerring
 
-                   if (options.duration !== 0 || !tooltip.classed(side)) {
-                       tooltip.call(uiToggle(true));
-                   }
+       var S_ATTR = 1; //attr name offerring 
 
-                   tooltip
-                       .style('top', pos[1] + 'px')
-                       .style('left', pos[0] + 'px')
-                       .attr('class', classes + ' ' + side);
+       var S_ATTR_SPACE = 2; //attr name end and space offer
 
+       var S_EQ = 3; //=space?
 
-                   // shift popover-inner if it is very close to the top or bottom edge
-                   // (doesn't affect the placement of the popover-arrow)
-                   var shiftY = 0;
-                   if (side === 'left' || side === 'right') {
-                       if (pos[1] < 60) {
-                           shiftY = 60 - pos[1];
-                       }
-                       else if (pos[1] + tip.height > h - 100) {
-                           shiftY = h - pos[1] - tip.height - 100;
-                       }
-                   }
-                   tooltip.selectAll('.popover-inner')
-                       .style('top', shiftY + 'px');
+       var S_ATTR_NOQUOT_VALUE = 4; //attr value(no quot value only)
 
-               } else {
-                   tooltip
-                       .classed('in', false)
-                       .call(uiToggle(false));
-               }
+       var S_ATTR_END = 5; //attr value end and no space(quot end)
 
-               curtain.cut(box, options.duration);
+       var S_TAG_SPACE = 6; //(attr value end || tag end ) && (space offer)
 
-               return tooltip;
-           };
+       var S_TAG_CLOSE = 7; //closed el<el />
 
+       function XMLReader() {}
 
-           curtain.cut = function(datum, duration) {
-               darkness.datum(datum)
-                   .interrupt();
+       XMLReader.prototype = {
+         parse: function parse(source, defaultNSMap, entityMap) {
+           var domBuilder = this.domBuilder;
+           domBuilder.startDocument();
 
-               var selection;
-               if (duration === 0) {
-                   selection = darkness;
-               } else {
-                   selection = darkness
-                       .transition()
-                       .duration(duration || 600)
-                       .ease(linear$1);
-               }
-
-               selection
-                   .attr('d', function(d) {
-                       var containerWidth = containerNode.clientWidth;
-                       var containerHeight = containerNode.clientHeight;
-                       var string = 'M 0,0 L 0,' + containerHeight + ' L ' +
-                           containerWidth + ',' + containerHeight + 'L' +
-                           containerWidth + ',0 Z';
-
-                       if (!d) return string;
-                       return string + 'M' +
-                           d.left + ',' + d.top + 'L' +
-                           d.left + ',' + (d.top + d.height) + 'L' +
-                           (d.left + d.width) + ',' + (d.top + d.height) + 'L' +
-                           (d.left + d.width) + ',' + (d.top) + 'Z';
+           _copy(defaultNSMap, defaultNSMap = {});
 
-                   });
-           };
+           _parse(source, defaultNSMap, entityMap, domBuilder, this.errorHandler);
 
+           domBuilder.endDocument();
+         }
+       };
 
-           curtain.remove = function() {
-               surface.remove();
-               tooltip.remove();
-               select(window).on('resize.curtain', null);
-           };
+       function _parse(source, defaultNSMapCopy, entityMap, domBuilder, errorHandler) {
+         function fixedFromCharCode(code) {
+           // String.prototype.fromCharCode does not supports
+           // > 2 bytes unicode chars directly
+           if (code > 0xffff) {
+             code -= 0x10000;
+             var surrogate1 = 0xd800 + (code >> 10),
+                 surrogate2 = 0xdc00 + (code & 0x3ff);
+             return String.fromCharCode(surrogate1, surrogate2);
+           } else {
+             return String.fromCharCode(code);
+           }
+         }
 
+         function entityReplacer(a) {
+           var k = a.slice(1, -1);
 
-           // ClientRects are immutable, so copy them to an object,
-           // in case we need to trim the height/width.
-           function copyBox(src) {
-               return {
-                   top: src.top,
-                   right: src.right,
-                   bottom: src.bottom,
-                   left: src.left,
-                   width: src.width,
-                   height: src.height
-               };
+           if (k in entityMap) {
+             return entityMap[k];
+           } else if (k.charAt(0) === '#') {
+             return fixedFromCharCode(parseInt(k.substr(1).replace('x', '0x')));
+           } else {
+             errorHandler.error('entity not found:' + a);
+             return a;
            }
+         }
 
+         function appendText(end) {
+           //has some bugs
+           if (end > start) {
+             var xt = source.substring(start, end).replace(/&#?\w+;/g, entityReplacer);
+             locator && position(start);
+             domBuilder.characters(xt, 0, end - start);
+             start = end;
+           }
+         }
 
-           return curtain;
-       }
-
-       function uiIntroWelcome(context, reveal) {
-           var dispatch$1 = dispatch('done');
+         function position(p, m) {
+           while (p >= lineEnd && (m = linePattern.exec(source))) {
+             lineStart = m.index;
+             lineEnd = lineStart + m[0].length;
+             locator.lineNumber++; //console.log('line++:',locator,startPos,endPos)
+           }
 
-           var chapter = {
-               title: 'intro.welcome.title'
-           };
+           locator.columnNumber = p - lineStart + 1;
+         }
 
+         var lineStart = 0;
+         var lineEnd = 0;
+         var linePattern = /.*(?:\r\n?|\n)|.*$/g;
+         var locator = domBuilder.locator;
+         var parseStack = [{
+           currentNSMap: defaultNSMapCopy
+         }];
+         var closeMap = {};
+         var start = 0;
 
-           function welcome() {
-               context.map().centerZoom([-85.63591, 41.94285], 19);
-               reveal('.intro-nav-wrap .chapter-welcome',
-                   helpString('intro.welcome.welcome'),
-                   { buttonText: _t('intro.ok'), buttonCallback: practice }
-               );
-           }
+         while (true) {
+           try {
+             var tagStart = source.indexOf('<', start);
 
-           function practice() {
-               reveal('.intro-nav-wrap .chapter-welcome',
-                   helpString('intro.welcome.practice'),
-                   { buttonText: _t('intro.ok'), buttonCallback: words }
-               );
-           }
+             if (tagStart < 0) {
+               if (!source.substr(start).match(/^\s*$/)) {
+                 var doc = domBuilder.doc;
+                 var text = doc.createTextNode(source.substr(start));
+                 doc.appendChild(text);
+                 domBuilder.currentElement = text;
+               }
 
-           function words() {
-               reveal('.intro-nav-wrap .chapter-welcome',
-                   helpString('intro.welcome.words'),
-                   { buttonText: _t('intro.ok'), buttonCallback: chapters }
-               );
-           }
+               return;
+             }
 
+             if (tagStart > start) {
+               appendText(tagStart);
+             }
 
-           function chapters() {
-               dispatch$1.call('done');
-               reveal('.intro-nav-wrap .chapter-navigation',
-                   helpString('intro.welcome.chapters', { next: _t('intro.navigation.title') })
-               );
-           }
+             switch (source.charAt(tagStart + 1)) {
+               case '/':
+                 var end = source.indexOf('>', tagStart + 3);
+                 var tagName = source.substring(tagStart + 2, end);
+                 var config = parseStack.pop();
 
+                 if (end < 0) {
+                   tagName = source.substring(tagStart + 2).replace(/[\s<].*/, ''); //console.error('#@@@@@@'+tagName)
 
-           chapter.enter = function() {
-               welcome();
-           };
+                   errorHandler.error("end tag name: " + tagName + ' is not complete:' + config.tagName);
+                   end = tagStart + 1 + tagName.length;
+                 } else if (tagName.match(/\s</)) {
+                   tagName = tagName.replace(/[\s<].*/, '');
+                   errorHandler.error("end tag name: " + tagName + ' maybe not complete');
+                   end = tagStart + 1 + tagName.length;
+                 } //console.error(parseStack.length,parseStack)
+                 //console.error(config);
 
 
-           chapter.exit = function() {
-               context.container().select('.curtain-tooltip.intro-mouse')
-                   .selectAll('.counter')
-                   .remove();
-           };
+                 var localNSMap = config.localNSMap;
+                 var endMatch = config.tagName == tagName;
+                 var endIgnoreCaseMach = endMatch || config.tagName && config.tagName.toLowerCase() == tagName.toLowerCase();
 
+                 if (endIgnoreCaseMach) {
+                   domBuilder.endElement(config.uri, config.localName, tagName);
 
-           chapter.restart = function() {
-               chapter.exit();
-               chapter.enter();
-           };
+                   if (localNSMap) {
+                     for (var prefix in localNSMap) {
+                       domBuilder.endPrefixMapping(prefix);
+                     }
+                   }
 
+                   if (!endMatch) {
+                     errorHandler.fatalError("end tag name: " + tagName + ' is not match the current start tagName:' + config.tagName);
+                   }
+                 } else {
+                   parseStack.push(config);
+                 }
 
-           return utilRebind(chapter, dispatch$1, 'on');
-       }
+                 end++;
+                 break;
+               // end elment
 
-       function uiIntroNavigation(context, reveal) {
-           var dispatch$1 = dispatch('done');
-           var timeouts = [];
-           var hallId = 'n2061';
-           var townHall = [-85.63591, 41.94285];
-           var springStreetId = 'w397';
-           var springStreetEndId = 'n1834';
-           var springStreet = [-85.63582, 41.94255];
-           var onewayField = _mainPresetIndex.field('oneway');
-           var maxspeedField = _mainPresetIndex.field('maxspeed');
-
-
-           var chapter = {
-               title: 'intro.navigation.title'
-           };
+               case '?':
+                 // <?...?>
+                 locator && position(tagStart);
+                 end = parseInstruction(source, tagStart, domBuilder);
+                 break;
 
+               case '!':
+                 // <!doctype,<![CDATA,<!--
+                 locator && position(tagStart);
+                 end = parseDCC(source, tagStart, domBuilder, errorHandler);
+                 break;
 
-           function timeout(f, t) {
-               timeouts.push(window.setTimeout(f, t));
-           }
+               default:
+                 locator && position(tagStart);
+                 var el = new ElementAttributes();
+                 var currentNSMap = parseStack[parseStack.length - 1].currentNSMap; //elStartEnd
 
+                 var end = parseElementStartPart(source, tagStart, el, currentNSMap, entityReplacer, errorHandler);
+                 var len = el.length;
 
-           function eventCancel() {
-               event.stopPropagation();
-               event.preventDefault();
-           }
+                 if (!el.closed && fixSelfClosed(source, end, el.tagName, closeMap)) {
+                   el.closed = true;
 
+                   if (!entityMap.nbsp) {
+                     errorHandler.warning('unclosed xml attribute');
+                   }
+                 }
 
-           function isTownHallSelected() {
-               var ids = context.selectedIDs();
-               return ids.length === 1 && ids[0] === hallId;
-           }
+                 if (locator && len) {
+                   var locator2 = copyLocator(locator, {}); //try{//attribute position fixed
 
+                   for (var i = 0; i < len; i++) {
+                     var a = el[i];
+                     position(a.offset);
+                     a.locator = copyLocator(locator, {});
+                   } //}catch(e){console.error('@@@@@'+e)}
 
-           function dragMap() {
-               context.enter(modeBrowse(context));
-               context.history().reset('initial');
 
-               var msec = transitionTime(townHall, context.map().center());
-               if (msec) { reveal(null, null, { duration: 0 }); }
-               context.map().centerZoomEase(townHall, 19, msec);
+                   domBuilder.locator = locator2;
 
-               timeout(function() {
-                   var centerStart = context.map().center();
+                   if (appendElement(el, domBuilder, currentNSMap)) {
+                     parseStack.push(el);
+                   }
 
-                   var textId = context.lastPointerType() === 'mouse' ? 'drag' : 'drag_touch';
-                   var dragString = helpString('intro.navigation.map_info') + '{br}' + helpString('intro.navigation.' + textId);
-                   reveal('.surface', dragString);
-                   context.map().on('drawn.intro', function() {
-                       reveal('.surface', dragString, { duration: 0 });
-                   });
+                   domBuilder.locator = locator;
+                 } else {
+                   if (appendElement(el, domBuilder, currentNSMap)) {
+                     parseStack.push(el);
+                   }
+                 }
 
-                   context.map().on('move.intro', function() {
-                       var centerNow = context.map().center();
-                       if (centerStart[0] !== centerNow[0] || centerStart[1] !== centerNow[1]) {
-                           context.map().on('move.intro', null);
-                           timeout(function() { continueTo(zoomMap); }, 3000);
-                       }
-                   });
+                 if (el.uri === 'http://www.w3.org/1999/xhtml' && !el.closed) {
+                   end = parseHtmlSpecialContent(source, end, el.tagName, entityReplacer, domBuilder);
+                 } else {
+                   end++;
+                 }
+
+             }
+           } catch (e) {
+             errorHandler.error('element parse error: ' + e); //errorHandler.error('element parse error: '+e);
 
-               }, msec + 100);
+             end = -1; //throw e;
+           }
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   nextStep();
-               }
+           if (end > start) {
+             start = end;
+           } else {
+             //TODO: 这里有可能sax回退,有位置错误风险
+             appendText(Math.max(tagStart, start) + 1);
            }
+         }
+       }
+
+       function copyLocator(f, t) {
+         t.lineNumber = f.lineNumber;
+         t.columnNumber = f.columnNumber;
+         return t;
+       }
+       /**
+        * @see #appendElement(source,elStartEnd,el,selfClosed,entityReplacer,domBuilder,parseStack);
+        * @return end of the elementStartPart(end of elementEndPart for selfClosed el)
+        */
 
 
-           function zoomMap() {
-               var zoomStart = context.map().zoom();
+       function parseElementStartPart(source, start, el, currentNSMap, entityReplacer, errorHandler) {
+         var attrName;
+         var value;
+         var p = ++start;
+         var s = S_TAG; //status
+
+         while (true) {
+           var c = source.charAt(p);
+
+           switch (c) {
+             case '=':
+               if (s === S_ATTR) {
+                 //attrName
+                 attrName = source.slice(start, p);
+                 s = S_EQ;
+               } else if (s === S_ATTR_SPACE) {
+                 s = S_EQ;
+               } else {
+                 //fatalError: equal must after attrName or space after attrName
+                 throw new Error('attribute equal must after attrName');
+               }
 
-               var textId = context.lastPointerType() === 'mouse' ? 'zoom' : 'zoom_touch';
-               var zoomString = helpString('intro.navigation.' + textId);
+               break;
 
-               reveal('.surface', zoomString);
+             case '\'':
+             case '"':
+               if (s === S_EQ || s === S_ATTR //|| s == S_ATTR_SPACE
+               ) {
+                   //equal
+                   if (s === S_ATTR) {
+                     errorHandler.warning('attribute value must after "="');
+                     attrName = source.slice(start, p);
+                   }
 
-               context.map().on('drawn.intro', function() {
-                   reveal('.surface', zoomString, { duration: 0 });
-               });
+                   start = p + 1;
+                   p = source.indexOf(c, start);
 
-               context.map().on('move.intro', function() {
-                   if (context.map().zoom() !== zoomStart) {
-                       context.map().on('move.intro', null);
-                       timeout(function() { continueTo(features); }, 3000);
+                   if (p > 0) {
+                     value = source.slice(start, p).replace(/&#?\w+;/g, entityReplacer);
+                     el.add(attrName, value, start - 1);
+                     s = S_ATTR_END;
+                   } else {
+                     //fatalError: no end quot match
+                     throw new Error('attribute value no end \'' + c + '\' match');
                    }
-               });
+                 } else if (s == S_ATTR_NOQUOT_VALUE) {
+                 value = source.slice(start, p).replace(/&#?\w+;/g, entityReplacer); //console.log(attrName,value,start,p)
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   nextStep();
+                 el.add(attrName, value, start); //console.dir(el)
+
+                 errorHandler.warning('attribute "' + attrName + '" missed start quot(' + c + ')!!');
+                 start = p + 1;
+                 s = S_ATTR_END;
+               } else {
+                 //fatalError: no equal before
+                 throw new Error('attribute value must after "="');
                }
-           }
 
+               break;
 
-           function features() {
-               var onClick = function() { continueTo(pointsLinesAreas); };
+             case '/':
+               switch (s) {
+                 case S_TAG:
+                   el.setTagName(source.slice(start, p));
 
-               reveal('.surface', helpString('intro.navigation.features'),
-                   { buttonText: _t('intro.ok'), buttonCallback: onClick }
-               );
+                 case S_ATTR_END:
+                 case S_TAG_SPACE:
+                 case S_TAG_CLOSE:
+                   s = S_TAG_CLOSE;
+                   el.closed = true;
 
-               context.map().on('drawn.intro', function() {
-                   reveal('.surface', helpString('intro.navigation.features'),
-                       { duration: 0, buttonText: _t('intro.ok'), buttonCallback: onClick }
-                   );
-               });
+                 case S_ATTR_NOQUOT_VALUE:
+                 case S_ATTR:
+                 case S_ATTR_SPACE:
+                   break;
+                 //case S_EQ:
 
-               function continueTo(nextStep) {
-                   context.map().on('drawn.intro', null);
-                   nextStep();
+                 default:
+                   throw new Error("attribute invalid close char('/')");
                }
-           }
-
-           function pointsLinesAreas() {
-               var onClick = function() { continueTo(nodesWays); };
 
-               reveal('.surface', helpString('intro.navigation.points_lines_areas'),
-                   { buttonText: _t('intro.ok'), buttonCallback: onClick }
-               );
+               break;
 
-               context.map().on('drawn.intro', function() {
-                   reveal('.surface', helpString('intro.navigation.points_lines_areas'),
-                       { duration: 0, buttonText: _t('intro.ok'), buttonCallback: onClick }
-                   );
-               });
+             case '':
+               //end document
+               //throw new Error('unexpected end of input')
+               errorHandler.error('unexpected end of input');
 
-               function continueTo(nextStep) {
-                   context.map().on('drawn.intro', null);
-                   nextStep();
+               if (s == S_TAG) {
+                 el.setTagName(source.slice(start, p));
                }
-           }
 
-           function nodesWays() {
-               var onClick = function() { continueTo(clickTownHall); };
+               return p;
 
-               reveal('.surface', helpString('intro.navigation.nodes_ways'),
-                   { buttonText: _t('intro.ok'), buttonCallback: onClick }
-               );
+             case '>':
+               switch (s) {
+                 case S_TAG:
+                   el.setTagName(source.slice(start, p));
 
-               context.map().on('drawn.intro', function() {
-                   reveal('.surface', helpString('intro.navigation.nodes_ways'),
-                       { duration: 0, buttonText: _t('intro.ok'), buttonCallback: onClick }
-                   );
-               });
+                 case S_ATTR_END:
+                 case S_TAG_SPACE:
+                 case S_TAG_CLOSE:
+                   break;
+                 //normal
 
-               function continueTo(nextStep) {
-                   context.map().on('drawn.intro', null);
-                   nextStep();
-               }
-           }
+                 case S_ATTR_NOQUOT_VALUE: //Compatible state
 
-           function clickTownHall() {
-               context.enter(modeBrowse(context));
-               context.history().reset('initial');
+                 case S_ATTR:
+                   value = source.slice(start, p);
 
-               var entity = context.hasEntity(hallId);
-               if (!entity) return;
-               reveal(null, null, { duration: 0 });
-               context.map().centerZoomEase(entity.loc, 19, 500);
-
-               timeout(function() {
-                   var entity = context.hasEntity(hallId);
-                   if (!entity) return;
-                   var box = pointBox(entity.loc, context);
-                   var textId = context.lastPointerType() === 'mouse' ? 'click_townhall' : 'tap_townhall';
-                   reveal(box, helpString('intro.navigation.' + textId));
-
-                   context.map().on('move.intro drawn.intro', function() {
-                       var entity = context.hasEntity(hallId);
-                       if (!entity) return;
-                       var box = pointBox(entity.loc, context);
-                       reveal(box, helpString('intro.navigation.' + textId), { duration: 0 });
-                   });
+                   if (value.slice(-1) === '/') {
+                     el.closed = true;
+                     value = value.slice(0, -1);
+                   }
 
-                   context.on('enter.intro', function() {
-                       if (isTownHallSelected()) continueTo(selectedTownHall);
-                   });
+                 case S_ATTR_SPACE:
+                   if (s === S_ATTR_SPACE) {
+                     value = attrName;
+                   }
 
-               }, 550);  // after centerZoomEase
+                   if (s == S_ATTR_NOQUOT_VALUE) {
+                     errorHandler.warning('attribute "' + value + '" missed quot(")!!');
+                     el.add(attrName, value.replace(/&#?\w+;/g, entityReplacer), start);
+                   } else {
+                     if (currentNSMap[''] !== 'http://www.w3.org/1999/xhtml' || !value.match(/^(?:disabled|checked|selected)$/i)) {
+                       errorHandler.warning('attribute "' + value + '" missed value!! "' + value + '" instead!!');
+                     }
 
-               context.history().on('change.intro', function() {
-                   if (!context.hasEntity(hallId)) {
-                       continueTo(clickTownHall);
+                     el.add(value, value, start);
                    }
-               });
-
-               function continueTo(nextStep) {
-                   context.on('enter.intro', null);
-                   context.map().on('move.intro drawn.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
-               }
-           }
 
+                   break;
 
-           function selectedTownHall() {
-               if (!isTownHallSelected()) return clickTownHall();
+                 case S_EQ:
+                   throw new Error('attribute value missed!!');
+               } //                    console.log(tagName,tagNamePattern,tagNamePattern.test(tagName))
 
-               var entity = context.hasEntity(hallId);
-               if (!entity) return clickTownHall();
 
-               var box = pointBox(entity.loc, context);
-               var onClick = function() { continueTo(editorTownHall); };
+               return p;
 
-               reveal(box, helpString('intro.navigation.selected_townhall'),
-                   { buttonText: _t('intro.ok'), buttonCallback: onClick }
-               );
+             /*xml space '\x20' | #x9 | #xD | #xA; */
 
-               context.map().on('move.intro drawn.intro', function() {
-                   var entity = context.hasEntity(hallId);
-                   if (!entity) return;
-                   var box = pointBox(entity.loc, context);
-                   reveal(box, helpString('intro.navigation.selected_townhall'),
-                       { duration: 0, buttonText: _t('intro.ok'), buttonCallback: onClick }
-                   );
-               });
+             case "\x80":
+               c = ' ';
 
-               context.history().on('change.intro', function() {
-                   if (!context.hasEntity(hallId)) {
-                       continueTo(clickTownHall);
-                   }
-               });
+             default:
+               if (c <= ' ') {
+                 //space
+                 switch (s) {
+                   case S_TAG:
+                     el.setTagName(source.slice(start, p)); //tagName
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
-               }
-           }
+                     s = S_TAG_SPACE;
+                     break;
 
+                   case S_ATTR:
+                     attrName = source.slice(start, p);
+                     s = S_ATTR_SPACE;
+                     break;
 
-           function editorTownHall() {
-               if (!isTownHallSelected()) return clickTownHall();
+                   case S_ATTR_NOQUOT_VALUE:
+                     var value = source.slice(start, p).replace(/&#?\w+;/g, entityReplacer);
+                     errorHandler.warning('attribute "' + value + '" missed quot(")!!');
+                     el.add(attrName, value, start);
 
-               // disallow scrolling
-               context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+                   case S_ATTR_END:
+                     s = S_TAG_SPACE;
+                     break;
+                   //case S_TAG_SPACE:
+                   //case S_EQ:
+                   //case S_ATTR_SPACE:
+                   //  void();break;
+                   //case S_TAG_CLOSE:
+                   //ignore warning
+                 }
+               } else {
+                 //not space
+                 //S_TAG,      S_ATTR, S_EQ,   S_ATTR_NOQUOT_VALUE
+                 //S_ATTR_SPACE,       S_ATTR_END,     S_TAG_SPACE, S_TAG_CLOSE
+                 switch (s) {
+                   //case S_TAG:void();break;
+                   //case S_ATTR:void();break;
+                   //case S_ATTR_NOQUOT_VALUE:void();break;
+                   case S_ATTR_SPACE:
+                     var tagName = el.tagName;
+
+                     if (currentNSMap[''] !== 'http://www.w3.org/1999/xhtml' || !attrName.match(/^(?:disabled|checked|selected)$/i)) {
+                       errorHandler.warning('attribute "' + attrName + '" missed value!! "' + attrName + '" instead2!!');
+                     }
 
-               var onClick = function() { continueTo(presetTownHall); };
+                     el.add(attrName, attrName, start);
+                     start = p;
+                     s = S_ATTR;
+                     break;
 
-               reveal('.entity-editor-pane',
-                   helpString('intro.navigation.editor_townhall'),
-                   { buttonText: _t('intro.ok'), buttonCallback: onClick }
-               );
+                   case S_ATTR_END:
+                     errorHandler.warning('attribute space is required"' + attrName + '"!!');
 
-               context.on('exit.intro', function() {
-                   continueTo(clickTownHall);
-               });
+                   case S_TAG_SPACE:
+                     s = S_ATTR;
+                     start = p;
+                     break;
 
-               context.history().on('change.intro', function() {
-                   if (!context.hasEntity(hallId)) {
-                       continueTo(clickTownHall);
-                   }
-               });
+                   case S_EQ:
+                     s = S_ATTR_NOQUOT_VALUE;
+                     start = p;
+                     break;
 
-               function continueTo(nextStep) {
-                   context.on('exit.intro', null);
-                   context.history().on('change.intro', null);
-                   context.container().select('.inspector-wrap').on('wheel.intro', null);
-                   nextStep();
+                   case S_TAG_CLOSE:
+                     throw new Error("elements closed character '/' and '>' must be connected to");
+                 }
                }
-           }
 
+           } //end outer switch
+           //console.log('p++',p)
 
-           function presetTownHall() {
-               if (!isTownHallSelected()) return clickTownHall();
 
-               // reset pane, in case user happened to change it..
-               context.container().select('.inspector-wrap .panewrap').style('right', '0%');
-               // disallow scrolling
-               context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+           p++;
+         }
+       }
+       /**
+        * @return true if has new namespace define
+        */
 
-               // preset match, in case the user happened to change it.
-               var entity = context.entity(context.selectedIDs()[0]);
-               var preset = _mainPresetIndex.match(entity, context.graph());
 
-               var onClick = function() { continueTo(fieldsTownHall); };
+       function appendElement(el, domBuilder, currentNSMap) {
+         var tagName = el.tagName;
+         var localNSMap = null; //var currentNSMap = parseStack[parseStack.length-1].currentNSMap;
 
-               reveal('.entity-editor-pane .section-feature-type',
-                   helpString('intro.navigation.preset_townhall', { preset: preset.name() }),
-                   { buttonText: _t('intro.ok'), buttonCallback: onClick }
-               );
+         var i = el.length;
 
-               context.on('exit.intro', function() {
-                   continueTo(clickTownHall);
-               });
+         while (i--) {
+           var a = el[i];
+           var qName = a.qName;
+           var value = a.value;
+           var nsp = qName.indexOf(':');
 
-               context.history().on('change.intro', function() {
-                   if (!context.hasEntity(hallId)) {
-                       continueTo(clickTownHall);
-                   }
-               });
+           if (nsp > 0) {
+             var prefix = a.prefix = qName.slice(0, nsp);
+             var localName = qName.slice(nsp + 1);
+             var nsPrefix = prefix === 'xmlns' && localName;
+           } else {
+             localName = qName;
+             prefix = null;
+             nsPrefix = qName === 'xmlns' && '';
+           } //can not set prefix,because prefix !== ''
 
-               function continueTo(nextStep) {
-                   context.on('exit.intro', null);
-                   context.history().on('change.intro', null);
-                   context.container().select('.inspector-wrap').on('wheel.intro', null);
-                   nextStep();
-               }
-           }
 
+           a.localName = localName; //prefix == null for no ns prefix attribute 
 
-           function fieldsTownHall() {
-               if (!isTownHallSelected()) return clickTownHall();
+           if (nsPrefix !== false) {
+             //hack!!
+             if (localNSMap == null) {
+               localNSMap = {}; //console.log(currentNSMap,0)
 
-               // reset pane, in case user happened to change it..
-               context.container().select('.inspector-wrap .panewrap').style('right', '0%');
-               // disallow scrolling
-               context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+               _copy(currentNSMap, currentNSMap = {}); //console.log(currentNSMap,1)
 
-               var onClick = function() { continueTo(closeTownHall); };
+             }
 
-               reveal('.entity-editor-pane .section-preset-fields',
-                   helpString('intro.navigation.fields_townhall'),
-                   { buttonText: _t('intro.ok'), buttonCallback: onClick }
-               );
+             currentNSMap[nsPrefix] = localNSMap[nsPrefix] = value;
+             a.uri = 'http://www.w3.org/2000/xmlns/';
+             domBuilder.startPrefixMapping(nsPrefix, value);
+           }
+         }
 
-               context.on('exit.intro', function() {
-                   continueTo(clickTownHall);
-               });
+         var i = el.length;
 
-               context.history().on('change.intro', function() {
-                   if (!context.hasEntity(hallId)) {
-                       continueTo(clickTownHall);
-                   }
-               });
+         while (i--) {
+           a = el[i];
+           var prefix = a.prefix;
 
-               function continueTo(nextStep) {
-                   context.on('exit.intro', null);
-                   context.history().on('change.intro', null);
-                   context.container().select('.inspector-wrap').on('wheel.intro', null);
-                   nextStep();
-               }
-           }
+           if (prefix) {
+             //no prefix attribute has no namespace
+             if (prefix === 'xml') {
+               a.uri = 'http://www.w3.org/XML/1998/namespace';
+             }
 
+             if (prefix !== 'xmlns') {
+               a.uri = currentNSMap[prefix || '']; //{console.log('###'+a.qName,domBuilder.locator.systemId+'',currentNSMap,a.uri)}
+             }
+           }
+         }
 
-           function closeTownHall() {
-               if (!isTownHallSelected()) return clickTownHall();
+         var nsp = tagName.indexOf(':');
 
-               var selector = '.entity-editor-pane button.close svg use';
-               var href = select(selector).attr('href') || '#iD-icon-close';
+         if (nsp > 0) {
+           prefix = el.prefix = tagName.slice(0, nsp);
+           localName = el.localName = tagName.slice(nsp + 1);
+         } else {
+           prefix = null; //important!!
 
-               reveal('.entity-editor-pane',
-                   helpString('intro.navigation.close_townhall', { button: icon(href, 'pre-text') })
-               );
+           localName = el.localName = tagName;
+         } //no prefix element has default namespace
 
-               context.on('exit.intro', function() {
-                   continueTo(searchStreet);
-               });
 
-               context.history().on('change.intro', function() {
-                   // update the close icon in the tooltip if the user edits something.
-                   var selector = '.entity-editor-pane button.close svg use';
-                   var href = select(selector).attr('href') || '#iD-icon-close';
+         var ns = el.uri = currentNSMap[prefix || ''];
+         domBuilder.startElement(ns, localName, tagName, el); //endPrefixMapping and startPrefixMapping have not any help for dom builder
+         //localNSMap = null
 
-                   reveal('.entity-editor-pane',
-                       helpString('intro.navigation.close_townhall', { button: icon(href, 'pre-text') }),
-                       { duration: 0 }
-                   );
-               });
+         if (el.closed) {
+           domBuilder.endElement(ns, localName, tagName);
 
-               function continueTo(nextStep) {
-                   context.on('exit.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
-               }
+           if (localNSMap) {
+             for (prefix in localNSMap) {
+               domBuilder.endPrefixMapping(prefix);
+             }
            }
+         } else {
+           el.currentNSMap = currentNSMap;
+           el.localNSMap = localNSMap; //parseStack.push(el);
 
+           return true;
+         }
+       }
 
-           function searchStreet() {
-               context.enter(modeBrowse(context));
-               context.history().reset('initial');  // ensure spring street exists
-
-               var msec = transitionTime(springStreet, context.map().center());
-               if (msec) { reveal(null, null, { duration: 0 }); }
-               context.map().centerZoomEase(springStreet, 19, msec);  // ..and user can see it
+       function parseHtmlSpecialContent(source, elStartEnd, tagName, entityReplacer, domBuilder) {
+         if (/^(?:script|textarea)$/i.test(tagName)) {
+           var elEndStart = source.indexOf('</' + tagName + '>', elStartEnd);
+           var text = source.substring(elStartEnd + 1, elEndStart);
 
-               timeout(function() {
-                   reveal('.search-header input',
-                       helpString('intro.navigation.search_street', { name: _t('intro.graph.name.spring-street') })
-                   );
+           if (/[&<]/.test(text)) {
+             if (/^script$/i.test(tagName)) {
+               //if(!/\]\]>/.test(text)){
+               //lexHandler.startCDATA();
+               domBuilder.characters(text, 0, text.length); //lexHandler.endCDATA();
 
-                   context.container().select('.search-header input')
-                       .on('keyup.intro', checkSearchResult);
-               }, msec + 100);
-           }
+               return elEndStart; //}
+             } //}else{//text area
 
 
-           function checkSearchResult() {
-               var first = context.container().select('.feature-list-item:nth-child(0n+2)');  // skip "No Results" item
-               var firstName = first.select('.entity-name');
-               var name = _t('intro.graph.name.spring-street');
+             text = text.replace(/&#?\w+;/g, entityReplacer);
+             domBuilder.characters(text, 0, text.length);
+             return elEndStart; //}
+           }
+         }
 
-               if (!firstName.empty() && firstName.text() === name) {
-                   reveal(first.node(),
-                       helpString('intro.navigation.choose_street', { name: name }),
-                       { duration: 300 }
-                   );
+         return elStartEnd + 1;
+       }
 
-                   context.on('exit.intro', function() {
-                       continueTo(selectedStreet);
-                   });
+       function fixSelfClosed(source, elStartEnd, tagName, closeMap) {
+         //if(tagName in closeMap){
+         var pos = closeMap[tagName];
 
-                   context.container().select('.search-header input')
-                       .on('keydown.intro', eventCancel, true)
-                       .on('keyup.intro', null);
-               }
+         if (pos == null) {
+           //console.log(tagName)
+           pos = source.lastIndexOf('</' + tagName + '>');
 
-               function continueTo(nextStep) {
-                   context.on('exit.intro', null);
-                   context.container().select('.search-header input')
-                       .on('keydown.intro', null)
-                       .on('keyup.intro', null);
-                   nextStep();
-               }
+           if (pos < elStartEnd) {
+             //忘记闭合
+             pos = source.lastIndexOf('</' + tagName);
            }
 
+           closeMap[tagName] = pos;
+         }
 
-           function selectedStreet() {
-               if (!context.hasEntity(springStreetEndId) || !context.hasEntity(springStreetId)) {
-                   return searchStreet();
-               }
+         return pos < elStartEnd; //} 
+       }
 
-               var onClick = function() { continueTo(editorStreet); };
-               var entity = context.entity(springStreetEndId);
-               var box = pointBox(entity.loc, context);
-               box.height = 500;
+       function _copy(source, target) {
+         for (var n in source) {
+           target[n] = source[n];
+         }
+       }
 
-               reveal(box,
-                   helpString('intro.navigation.selected_street', { name: _t('intro.graph.name.spring-street') }),
-                   { duration: 600, buttonText: _t('intro.ok'), buttonCallback: onClick }
-               );
+       function parseDCC(source, start, domBuilder, errorHandler) {
+         //sure start with '<!'
+         var next = source.charAt(start + 2);
 
-               timeout(function() {
-                   context.map().on('move.intro drawn.intro', function() {
-                       var entity = context.hasEntity(springStreetEndId);
-                       if (!entity) return;
-                       var box = pointBox(entity.loc, context);
-                       box.height = 500;
-                       reveal(box,
-                           helpString('intro.navigation.selected_street', { name: _t('intro.graph.name.spring-street') }),
-                           { duration: 0, buttonText: _t('intro.ok'), buttonCallback: onClick }
-                       );
-                   });
-               }, 600);  // after reveal.
+         switch (next) {
+           case '-':
+             if (source.charAt(start + 3) === '-') {
+               var end = source.indexOf('-->', start + 4); //append comment source.substring(4,end)//<!--
 
-               context.on('enter.intro', function(mode) {
-                   if (!context.hasEntity(springStreetId)) {
-                       return continueTo(searchStreet);
-                   }
-                   var ids = context.selectedIDs();
-                   if (mode.id !== 'select' || !ids.length || ids[0] !== springStreetId) {
-                       // keep Spring Street selected..
-                       context.enter(modeSelect(context, [springStreetId]));
-                   }
-               });
+               if (end > start) {
+                 domBuilder.comment(source, start + 4, end - start - 4);
+                 return end + 3;
+               } else {
+                 errorHandler.error("Unclosed comment");
+                 return -1;
+               }
+             } else {
+               //error
+               return -1;
+             }
 
-               context.history().on('change.intro', function() {
-                   if (!context.hasEntity(springStreetEndId) || !context.hasEntity(springStreetId)) {
-                       timeout(function() {
-                           continueTo(searchStreet);
-                       }, 300);  // after any transition (e.g. if user deleted intersection)
-                   }
-               });
+           default:
+             if (source.substr(start + 3, 6) == 'CDATA[') {
+               var end = source.indexOf(']]>', start + 9);
+               domBuilder.startCDATA();
+               domBuilder.characters(source, start + 9, end - start - 9);
+               domBuilder.endCDATA();
+               return end + 3;
+             } //<!DOCTYPE
+             //startDTD(java.lang.String name, java.lang.String publicId, java.lang.String systemId) 
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.on('enter.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
-               }
-           }
 
+             var matchs = split$1(source, start);
+             var len = matchs.length;
 
-           function editorStreet() {
-               var selector = '.entity-editor-pane button.close svg use';
-               var href = select(selector).attr('href') || '#iD-icon-close';
+             if (len > 1 && /!doctype/i.test(matchs[0][0])) {
+               var name = matchs[1][0];
+               var pubid = len > 3 && /^public$/i.test(matchs[2][0]) && matchs[3][0];
+               var sysid = len > 4 && matchs[4][0];
+               var lastMatch = matchs[len - 1];
+               domBuilder.startDTD(name, pubid && pubid.replace(/^(['"])(.*?)\1$/, '$2'), sysid && sysid.replace(/^(['"])(.*?)\1$/, '$2'));
+               domBuilder.endDTD();
+               return lastMatch.index + lastMatch[0].length;
+             }
 
-               reveal('.entity-editor-pane', helpString('intro.navigation.street_different_fields') + '{br}' +
-                   helpString('intro.navigation.editor_street', {
-                       button: icon(href, 'pre-text'),
-                       field1: onewayField.label(),
-                       field2: maxspeedField.label()
-                   }));
+         }
 
-               context.on('exit.intro', function() {
-                   continueTo(play);
-               });
+         return -1;
+       }
 
-               context.history().on('change.intro', function() {
-                   // update the close icon in the tooltip if the user edits something.
-                   var selector = '.entity-editor-pane button.close svg use';
-                   var href = select(selector).attr('href') || '#iD-icon-close';
-
-                   reveal('.entity-editor-pane', helpString('intro.navigation.street_different_fields') + '{br}' +
-                       helpString('intro.navigation.editor_street', {
-                           button: icon(href, 'pre-text'),
-                           field1: onewayField.label(),
-                           field2: maxspeedField.label()
-                       }), { duration: 0 }
-                   );
-               });
+       function parseInstruction(source, start, domBuilder) {
+         var end = source.indexOf('?>', start);
 
-               function continueTo(nextStep) {
-                   context.on('exit.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
-               }
+         if (end) {
+           var match = source.substring(start, end).match(/^<\?(\S*)\s*([\s\S]*?)\s*$/);
+
+           if (match) {
+             var len = match[0].length;
+             domBuilder.processingInstruction(match[1], match[2]);
+             return end + 2;
+           } else {
+             //error
+             return -1;
            }
+         }
+
+         return -1;
+       }
+       /**
+        * @param source
+        */
 
 
-           function play() {
-               dispatch$1.call('done');
-               reveal('.ideditor',
-                   helpString('intro.navigation.play', { next: _t('intro.points.title') }), {
-                       tooltipBox: '.intro-nav-wrap .chapter-point',
-                       buttonText: _t('intro.ok'),
-                       buttonCallback: function() { reveal('.ideditor'); }
-                   }
-               );
+       function ElementAttributes(source) {}
+
+       ElementAttributes.prototype = {
+         setTagName: function setTagName(tagName) {
+           if (!tagNamePattern.test(tagName)) {
+             throw new Error('invalid tagName:' + tagName);
            }
 
+           this.tagName = tagName;
+         },
+         add: function add(qName, value, offset) {
+           if (!tagNamePattern.test(qName)) {
+             throw new Error('invalid attribute:' + qName);
+           }
 
-           chapter.enter = function() {
-               dragMap();
+           this[this.length++] = {
+             qName: qName,
+             value: value,
+             offset: offset
            };
+         },
+         length: 0,
+         getLocalName: function getLocalName(i) {
+           return this[i].localName;
+         },
+         getLocator: function getLocator(i) {
+           return this[i].locator;
+         },
+         getQName: function getQName(i) {
+           return this[i].qName;
+         },
+         getURI: function getURI(i) {
+           return this[i].uri;
+         },
+         getValue: function getValue(i) {
+           return this[i].value;
+         } //  ,getIndex:function(uri, localName)){
+         //            if(localName){
+         //                    
+         //            }else{
+         //                    var qName = uri
+         //            }
+         //    },
+         //    getValue:function(){return this.getValue(this.getIndex.apply(this,arguments))},
+         //    getType:function(uri,localName){}
+         //    getType:function(i){},
 
+       };
 
-           chapter.exit = function() {
-               timeouts.forEach(window.clearTimeout);
-               context.on('enter.intro exit.intro', null);
-               context.map().on('move.intro drawn.intro', null);
-               context.history().on('change.intro', null);
-               context.container().select('.inspector-wrap').on('wheel.intro', null);
-               context.container().select('.search-header input').on('keydown.intro keyup.intro', null);
-           };
+       function _set_proto_(thiz, parent) {
+         thiz.__proto__ = parent;
+         return thiz;
+       }
 
+       if (!(_set_proto_({}, _set_proto_.prototype) instanceof _set_proto_)) {
+         _set_proto_ = function _set_proto_(thiz, parent) {
+           function p() {}
+           p.prototype = parent;
+           p = new p();
 
-           chapter.restart = function() {
-               chapter.exit();
-               chapter.enter();
-           };
+           for (parent in thiz) {
+             p[parent] = thiz[parent];
+           }
+
+           return p;
+         };
+       }
 
+       function split$1(source, start) {
+         var match;
+         var buf = [];
+         var reg = /'[^']+'|"[^"]+"|[^\s<>\/=]+=?|(\/?\s*>|<)/g;
+         reg.lastIndex = start;
+         reg.exec(source); //skip <
 
-           return utilRebind(chapter, dispatch$1, 'on');
+         while (match = reg.exec(source)) {
+           buf.push(match);
+           if (match[1]) return buf;
+         }
        }
 
-       function uiIntroPoint(context, reveal) {
-           var dispatch$1 = dispatch('done');
-           var timeouts = [];
-           var intersection = [-85.63279, 41.94394];
-           var building = [-85.632422, 41.944045];
-           var cafePreset = _mainPresetIndex.item('amenity/cafe');
-           var _pointID = null;
+       var XMLReader_1 = XMLReader;
+       var sax = {
+         XMLReader: XMLReader_1
+       };
 
+       /*
+        * DOM Level 2
+        * Object DOMException
+        * @see http://www.w3.org/TR/REC-DOM-Level-1/ecma-script-language-binding.html
+        * @see http://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113/ecma-script-binding.html
+        */
+       function copy$1(src, dest) {
+         for (var p in src) {
+           dest[p] = src[p];
+         }
+       }
+       /**
+       ^\w+\.prototype\.([_\w]+)\s*=\s*((?:.*\{\s*?[\r\n][\s\S]*?^})|\S.*?(?=[;\r\n]));?
+       ^\w+\.prototype\.([_\w]+)\s*=\s*(\S.*?(?=[;\r\n]));?
+        */
 
-           var chapter = {
-               title: 'intro.points.title'
-           };
 
+       function _extends(Class, Super) {
+         var pt = Class.prototype;
 
-           function timeout(f, t) {
-               timeouts.push(window.setTimeout(f, t));
-           }
+         if (Object.create) {
+           var ppt = Object.create(Super.prototype);
+           pt.__proto__ = ppt;
+         }
 
+         if (!(pt instanceof Super)) {
+           var t = function t() {};
+           t.prototype = Super.prototype;
+           t = new t();
+           copy$1(pt, t);
+           Class.prototype = pt = t;
+         }
 
-           function eventCancel() {
-               event.stopPropagation();
-               event.preventDefault();
+         if (pt.constructor != Class) {
+           if (typeof Class != 'function') {
+             console.error("unknow Class:" + Class);
            }
 
+           pt.constructor = Class;
+         }
+       }
 
-           function addPoint() {
-               context.enter(modeBrowse(context));
-               context.history().reset('initial');
+       var htmlns = 'http://www.w3.org/1999/xhtml'; // Node Types
 
-               var msec = transitionTime(intersection, context.map().center());
-               if (msec) { reveal(null, null, { duration: 0 }); }
-               context.map().centerZoomEase(intersection, 19, msec);
+       var NodeType = {};
+       var ELEMENT_NODE = NodeType.ELEMENT_NODE = 1;
+       var ATTRIBUTE_NODE = NodeType.ATTRIBUTE_NODE = 2;
+       var TEXT_NODE = NodeType.TEXT_NODE = 3;
+       var CDATA_SECTION_NODE = NodeType.CDATA_SECTION_NODE = 4;
+       var ENTITY_REFERENCE_NODE = NodeType.ENTITY_REFERENCE_NODE = 5;
+       var ENTITY_NODE = NodeType.ENTITY_NODE = 6;
+       var PROCESSING_INSTRUCTION_NODE = NodeType.PROCESSING_INSTRUCTION_NODE = 7;
+       var COMMENT_NODE = NodeType.COMMENT_NODE = 8;
+       var DOCUMENT_NODE = NodeType.DOCUMENT_NODE = 9;
+       var DOCUMENT_TYPE_NODE = NodeType.DOCUMENT_TYPE_NODE = 10;
+       var DOCUMENT_FRAGMENT_NODE = NodeType.DOCUMENT_FRAGMENT_NODE = 11;
+       var NOTATION_NODE = NodeType.NOTATION_NODE = 12; // ExceptionCode
 
-               timeout(function() {
-                   var tooltip = reveal('button.add-point',
-                       helpString('intro.points.points_info') + '{br}' + helpString('intro.points.add_point'));
+       var ExceptionCode = {};
+       var ExceptionMessage = {};
+       var INDEX_SIZE_ERR = ExceptionCode.INDEX_SIZE_ERR = (ExceptionMessage[1] = "Index size error", 1);
+       var DOMSTRING_SIZE_ERR = ExceptionCode.DOMSTRING_SIZE_ERR = (ExceptionMessage[2] = "DOMString size error", 2);
+       var HIERARCHY_REQUEST_ERR = ExceptionCode.HIERARCHY_REQUEST_ERR = (ExceptionMessage[3] = "Hierarchy request error", 3);
+       var WRONG_DOCUMENT_ERR = ExceptionCode.WRONG_DOCUMENT_ERR = (ExceptionMessage[4] = "Wrong document", 4);
+       var INVALID_CHARACTER_ERR = ExceptionCode.INVALID_CHARACTER_ERR = (ExceptionMessage[5] = "Invalid character", 5);
+       var NO_DATA_ALLOWED_ERR = ExceptionCode.NO_DATA_ALLOWED_ERR = (ExceptionMessage[6] = "No data allowed", 6);
+       var NO_MODIFICATION_ALLOWED_ERR = ExceptionCode.NO_MODIFICATION_ALLOWED_ERR = (ExceptionMessage[7] = "No modification allowed", 7);
+       var NOT_FOUND_ERR = ExceptionCode.NOT_FOUND_ERR = (ExceptionMessage[8] = "Not found", 8);
+       var NOT_SUPPORTED_ERR = ExceptionCode.NOT_SUPPORTED_ERR = (ExceptionMessage[9] = "Not supported", 9);
+       var INUSE_ATTRIBUTE_ERR = ExceptionCode.INUSE_ATTRIBUTE_ERR = (ExceptionMessage[10] = "Attribute in use", 10); //level2
+
+       var INVALID_STATE_ERR = ExceptionCode.INVALID_STATE_ERR = (ExceptionMessage[11] = "Invalid state", 11);
+       var SYNTAX_ERR = ExceptionCode.SYNTAX_ERR = (ExceptionMessage[12] = "Syntax error", 12);
+       var INVALID_MODIFICATION_ERR = ExceptionCode.INVALID_MODIFICATION_ERR = (ExceptionMessage[13] = "Invalid modification", 13);
+       var NAMESPACE_ERR = ExceptionCode.NAMESPACE_ERR = (ExceptionMessage[14] = "Invalid namespace", 14);
+       var INVALID_ACCESS_ERR = ExceptionCode.INVALID_ACCESS_ERR = (ExceptionMessage[15] = "Invalid access", 15);
 
-                   _pointID = null;
+       function DOMException$2(code, message) {
+         if (message instanceof Error) {
+           var error = message;
+         } else {
+           error = this;
+           Error.call(this, ExceptionMessage[code]);
+           this.message = ExceptionMessage[code];
+           if (Error.captureStackTrace) Error.captureStackTrace(this, DOMException$2);
+         }
 
-                   tooltip.selectAll('.popover-inner')
-                       .insert('svg', 'span')
-                       .attr('class', 'tooltip-illustration')
-                       .append('use')
-                       .attr('xlink:href', '#iD-graphic-points');
+         error.code = code;
+         if (message) this.message = this.message + ": " + message;
+         return error;
+       }
+       DOMException$2.prototype = Error.prototype;
+       copy$1(ExceptionCode, DOMException$2);
+       /**
+        * @see http://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113/core.html#ID-536297177
+        * The NodeList interface provides the abstraction of an ordered collection of nodes, without defining or constraining how this collection is implemented. NodeList objects in the DOM are live.
+        * The items in the NodeList are accessible via an integral index, starting from 0.
+        */
 
-                   context.on('enter.intro', function(mode) {
-                       if (mode.id !== 'add-point') return;
-                       continueTo(placePoint);
-                   });
-               }, msec + 100);
+       function NodeList() {}
+       NodeList.prototype = {
+         /**
+          * The number of nodes in the list. The range of valid child node indices is 0 to length-1 inclusive.
+          * @standard level1
+          */
+         length: 0,
 
-               function continueTo(nextStep) {
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
+         /**
+          * Returns the indexth item in the collection. If index is greater than or equal to the number of nodes in the list, this returns null.
+          * @standard level1
+          * @param index  unsigned long 
+          *   Index into the collection.
+          * @return Node
+          *    The node at the indexth position in the NodeList, or null if that is not a valid index. 
+          */
+         item: function item(index) {
+           return this[index] || null;
+         },
+         toString: function toString(isHTML, nodeFilter) {
+           for (var buf = [], i = 0; i < this.length; i++) {
+             serializeToString(this[i], buf, isHTML, nodeFilter);
            }
 
+           return buf.join('');
+         }
+       };
 
-           function placePoint() {
-               if (context.mode().id !== 'add-point') {
-                   return chapter.restart();
-               }
-
-               var pointBox = pad(building, 150, context);
-               var textId = context.lastPointerType() === 'mouse' ? 'place_point' : 'place_point_touch';
-               reveal(pointBox, helpString('intro.points.' + textId));
+       function LiveNodeList(node, refresh) {
+         this._node = node;
+         this._refresh = refresh;
 
-               context.map().on('move.intro drawn.intro', function() {
-                   pointBox = pad(building, 150, context);
-                   reveal(pointBox, helpString('intro.points.' + textId), { duration: 0 });
-               });
+         _updateLiveList(this);
+       }
 
-               context.on('enter.intro', function(mode) {
-                   if (mode.id !== 'select') return chapter.restart();
-                   _pointID = context.mode().selectedIDs()[0];
-                   continueTo(searchPreset);
-               });
+       function _updateLiveList(list) {
+         var inc = list._node._inc || list._node.ownerDocument._inc;
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
-           }
+         if (list._inc != inc) {
+           var ls = list._refresh(list._node); //console.log(ls.length)
 
 
-           function searchPreset() {
-               if (context.mode().id !== 'select' || !_pointID || !context.hasEntity(_pointID)) {
-                   return addPoint();
-               }
+           __set__(list, 'length', ls.length);
 
-               // disallow scrolling
-               context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+           copy$1(ls, list);
+           list._inc = inc;
+         }
+       }
 
-               context.container().select('.preset-search-input')
-                   .on('keydown.intro', null)
-                   .on('keyup.intro', checkPresetSearch);
+       LiveNodeList.prototype.item = function (i) {
+         _updateLiveList(this);
 
-               reveal('.preset-search-input',
-                   helpString('intro.points.search_cafe', { preset: cafePreset.name() })
-               );
+         return this[i];
+       };
 
-               context.on('enter.intro', function(mode) {
-                   if (!_pointID || !context.hasEntity(_pointID)) {
-                       return continueTo(addPoint);
-                   }
+       _extends(LiveNodeList, NodeList);
+       /**
+        * 
+        * Objects implementing the NamedNodeMap interface are used to represent collections of nodes that can be accessed by name. Note that NamedNodeMap does not inherit from NodeList; NamedNodeMaps are not maintained in any particular order. Objects contained in an object implementing NamedNodeMap may also be accessed by an ordinal index, but this is simply to allow convenient enumeration of the contents of a NamedNodeMap, and does not imply that the DOM specifies an order to these Nodes.
+        * NamedNodeMap objects in the DOM are live.
+        * used for attributes or DocumentType entities 
+        */
 
-                   var ids = context.selectedIDs();
-                   if (mode.id !== 'select' || !ids.length || ids[0] !== _pointID) {
-                       // keep the user's point selected..
-                       context.enter(modeSelect(context, [_pointID]));
 
-                       // disallow scrolling
-                       context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+       function NamedNodeMap() {}
 
-                       context.container().select('.preset-search-input')
-                           .on('keydown.intro', null)
-                           .on('keyup.intro', checkPresetSearch);
+       function _findNodeIndex(list, node) {
+         var i = list.length;
 
-                       reveal('.preset-search-input',
-                           helpString('intro.points.search_cafe', { preset: cafePreset.name() })
-                       );
+         while (i--) {
+           if (list[i] === node) {
+             return i;
+           }
+         }
+       }
 
-                       context.history().on('change.intro', null);
-                   }
-               });
+       function _addNamedNode(el, list, newAttr, oldAttr) {
+         if (oldAttr) {
+           list[_findNodeIndex(list, oldAttr)] = newAttr;
+         } else {
+           list[list.length++] = newAttr;
+         }
 
+         if (el) {
+           newAttr.ownerElement = el;
+           var doc = el.ownerDocument;
 
-               function checkPresetSearch() {
-                   var first = context.container().select('.preset-list-item:first-child');
+           if (doc) {
+             oldAttr && _onRemoveAttribute(doc, el, oldAttr);
 
-                   if (first.classed('preset-amenity-cafe')) {
-                       context.container().select('.preset-search-input')
-                           .on('keydown.intro', eventCancel, true)
-                           .on('keyup.intro', null);
+             _onAddAttribute(doc, el, newAttr);
+           }
+         }
+       }
 
-                       reveal(first.select('.preset-list-button').node(),
-                           helpString('intro.points.choose_cafe', { preset: cafePreset.name() }),
-                           { duration: 300 }
-                       );
+       function _removeNamedNode(el, list, attr) {
+         //console.log('remove attr:'+attr)
+         var i = _findNodeIndex(list, attr);
 
-                       context.history().on('change.intro', function() {
-                           continueTo(aboutFeatureEditor);
-                       });
-                   }
-               }
+         if (i >= 0) {
+           var lastIndex = list.length - 1;
 
-               function continueTo(nextStep) {
-                   context.on('enter.intro', null);
-                   context.history().on('change.intro', null);
-                   context.container().select('.inspector-wrap').on('wheel.intro', null);
-                   context.container().select('.preset-search-input').on('keydown.intro keyup.intro', null);
-                   nextStep();
-               }
+           while (i < lastIndex) {
+             list[i] = list[++i];
            }
 
+           list.length = lastIndex;
 
-           function aboutFeatureEditor() {
-               if (context.mode().id !== 'select' || !_pointID || !context.hasEntity(_pointID)) {
-                   return addPoint();
-               }
-
-               timeout(function() {
-                   reveal('.entity-editor-pane', helpString('intro.points.feature_editor'), {
-                       tooltipClass: 'intro-points-describe',
-                       buttonText: _t('intro.ok'),
-                       buttonCallback: function() { continueTo(addName); }
-                   });
-               }, 400);
+           if (el) {
+             var doc = el.ownerDocument;
 
-               context.on('exit.intro', function() {
-                   // if user leaves select mode here, just continue with the tutorial.
-                   continueTo(reselectPoint);
-               });
+             if (doc) {
+               _onRemoveAttribute(doc, el, attr);
 
-               function continueTo(nextStep) {
-                   context.on('exit.intro', null);
-                   nextStep();
-               }
+               attr.ownerElement = null;
+             }
            }
+         } else {
+           throw DOMException$2(NOT_FOUND_ERR, new Error(el.tagName + '@' + attr));
+         }
+       }
 
+       NamedNodeMap.prototype = {
+         length: 0,
+         item: NodeList.prototype.item,
+         getNamedItem: function getNamedItem(key) {
+           //          if(key.indexOf(':')>0 || key == 'xmlns'){
+           //                  return null;
+           //          }
+           //console.log()
+           var i = this.length;
 
-           function addName() {
-               if (context.mode().id !== 'select' || !_pointID || !context.hasEntity(_pointID)) {
-                   return addPoint();
-               }
+           while (i--) {
+             var attr = this[i]; //console.log(attr.nodeName,key)
 
-               // reset pane, in case user happened to change it..
-               context.container().select('.inspector-wrap .panewrap').style('right', '0%');
+             if (attr.nodeName == key) {
+               return attr;
+             }
+           }
+         },
+         setNamedItem: function setNamedItem(attr) {
+           var el = attr.ownerElement;
 
-               var addNameString = helpString('intro.points.fields_info') + '{br}' + helpString('intro.points.add_name');
+           if (el && el != this._ownerElement) {
+             throw new DOMException$2(INUSE_ATTRIBUTE_ERR);
+           }
 
-               timeout(function() {
-                   // It's possible for the user to add a name in a previous step..
-                   // If so, don't tell them to add the name in this step.
-                   // Give them an OK button instead.
-                   var entity = context.entity(_pointID);
-                   if (entity.tags.name) {
-                       var tooltip = reveal('.entity-editor-pane', addNameString, {
-                           tooltipClass: 'intro-points-describe',
-                           buttonText: _t('intro.ok'),
-                           buttonCallback: function() { continueTo(addCloseEditor); }
-                       });
-                       tooltip.select('.instruction').style('display', 'none');
+           var oldAttr = this.getNamedItem(attr.nodeName);
 
-                   } else {
-                       reveal('.entity-editor-pane', addNameString,
-                           { tooltipClass: 'intro-points-describe' }
-                       );
-                   }
-               }, 400);
+           _addNamedNode(this._ownerElement, this, attr, oldAttr);
 
-               context.history().on('change.intro', function() {
-                   continueTo(addCloseEditor);
-               });
+           return oldAttr;
+         },
 
-               context.on('exit.intro', function() {
-                   // if user leaves select mode here, just continue with the tutorial.
-                   continueTo(reselectPoint);
-               });
+         /* returns Node */
+         setNamedItemNS: function setNamedItemNS(attr) {
+           // raises: WRONG_DOCUMENT_ERR,NO_MODIFICATION_ALLOWED_ERR,INUSE_ATTRIBUTE_ERR
+           var el = attr.ownerElement,
+               oldAttr;
 
-               function continueTo(nextStep) {
-                   context.on('exit.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
-               }
+           if (el && el != this._ownerElement) {
+             throw new DOMException$2(INUSE_ATTRIBUTE_ERR);
            }
 
+           oldAttr = this.getNamedItemNS(attr.namespaceURI, attr.localName);
 
-           function addCloseEditor() {
-               // reset pane, in case user happened to change it..
-               context.container().select('.inspector-wrap .panewrap').style('right', '0%');
+           _addNamedNode(this._ownerElement, this, attr, oldAttr);
 
-               var selector = '.entity-editor-pane button.close svg use';
-               var href = select(selector).attr('href') || '#iD-icon-close';
+           return oldAttr;
+         },
 
-               context.on('exit.intro', function() {
-                   continueTo(reselectPoint);
-               });
+         /* returns Node */
+         removeNamedItem: function removeNamedItem(key) {
+           var attr = this.getNamedItem(key);
 
-               reveal('.entity-editor-pane',
-                   helpString('intro.points.add_close', { button: icon(href, 'pre-text') })
-               );
+           _removeNamedNode(this._ownerElement, this, attr);
 
-               function continueTo(nextStep) {
-                   context.on('exit.intro', null);
-                   nextStep();
-               }
+           return attr;
+         },
+         // raises: NOT_FOUND_ERR,NO_MODIFICATION_ALLOWED_ERR
+         //for level2
+         removeNamedItemNS: function removeNamedItemNS(namespaceURI, localName) {
+           var attr = this.getNamedItemNS(namespaceURI, localName);
+
+           _removeNamedNode(this._ownerElement, this, attr);
+
+           return attr;
+         },
+         getNamedItemNS: function getNamedItemNS(namespaceURI, localName) {
+           var i = this.length;
+
+           while (i--) {
+             var node = this[i];
+
+             if (node.localName == localName && node.namespaceURI == namespaceURI) {
+               return node;
+             }
            }
 
+           return null;
+         }
+       };
+       /**
+        * @see http://www.w3.org/TR/REC-DOM-Level-1/level-one-core.html#ID-102161490
+        */
 
-           function reselectPoint() {
-               if (!_pointID) return chapter.restart();
-               var entity = context.hasEntity(_pointID);
-               if (!entity) return chapter.restart();
+       function DOMImplementation(
+       /* Object */
+       features) {
+         this._features = {};
 
-               // make sure it's still a cafe, in case user somehow changed it..
-               var oldPreset = _mainPresetIndex.match(entity, context.graph());
-               context.replace(actionChangePreset(_pointID, oldPreset, cafePreset));
+         if (features) {
+           for (var feature in features) {
+             this._features = features[feature];
+           }
+         }
+       }
+       DOMImplementation.prototype = {
+         hasFeature: function hasFeature(
+         /* string */
+         feature,
+         /* string */
+         version) {
+           var versions = this._features[feature.toLowerCase()];
+
+           if (versions && (!version || version in versions)) {
+             return true;
+           } else {
+             return false;
+           }
+         },
+         // Introduced in DOM Level 2:
+         createDocument: function createDocument(namespaceURI, qualifiedName, doctype) {
+           // raises:INVALID_CHARACTER_ERR,NAMESPACE_ERR,WRONG_DOCUMENT_ERR
+           var doc = new Document();
+           doc.implementation = this;
+           doc.childNodes = new NodeList();
+           doc.doctype = doctype;
 
-               context.enter(modeBrowse(context));
+           if (doctype) {
+             doc.appendChild(doctype);
+           }
 
-               var msec = transitionTime(entity.loc, context.map().center());
-               if (msec) { reveal(null, null, { duration: 0 }); }
-               context.map().centerEase(entity.loc, msec);
+           if (qualifiedName) {
+             var root = doc.createElementNS(namespaceURI, qualifiedName);
+             doc.appendChild(root);
+           }
 
-               timeout(function() {
-                   var box = pointBox(entity.loc, context);
-                   reveal(box, helpString('intro.points.reselect'), { duration: 600 });
+           return doc;
+         },
+         // Introduced in DOM Level 2:
+         createDocumentType: function createDocumentType(qualifiedName, publicId, systemId) {
+           // raises:INVALID_CHARACTER_ERR,NAMESPACE_ERR
+           var node = new DocumentType();
+           node.name = qualifiedName;
+           node.nodeName = qualifiedName;
+           node.publicId = publicId;
+           node.systemId = systemId; // Introduced in DOM Level 2:
+           //readonly attribute DOMString        internalSubset;
+           //TODO:..
+           //  readonly attribute NamedNodeMap     entities;
+           //  readonly attribute NamedNodeMap     notations;
 
-                   timeout(function() {
-                       context.map().on('move.intro drawn.intro', function() {
-                           var entity = context.hasEntity(_pointID);
-                           if (!entity) return chapter.restart();
-                           var box = pointBox(entity.loc, context);
-                           reveal(box, helpString('intro.points.reselect'), { duration: 0 });
-                       });
-                   }, 600); // after reveal..
+           return node;
+         }
+       };
+       /**
+        * @see http://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113/core.html#ID-1950641247
+        */
 
-                   context.on('enter.intro', function(mode) {
-                       if (mode.id !== 'select') return;
-                       continueTo(updatePoint);
-                   });
+       function Node() {}
+       Node.prototype = {
+         firstChild: null,
+         lastChild: null,
+         previousSibling: null,
+         nextSibling: null,
+         attributes: null,
+         parentNode: null,
+         childNodes: null,
+         ownerDocument: null,
+         nodeValue: null,
+         namespaceURI: null,
+         prefix: null,
+         localName: null,
+         // Modified in DOM Level 2:
+         insertBefore: function insertBefore(newChild, refChild) {
+           //raises 
+           return _insertBefore(this, newChild, refChild);
+         },
+         replaceChild: function replaceChild(newChild, oldChild) {
+           //raises 
+           this.insertBefore(newChild, oldChild);
+
+           if (oldChild) {
+             this.removeChild(oldChild);
+           }
+         },
+         removeChild: function removeChild(oldChild) {
+           return _removeChild(this, oldChild);
+         },
+         appendChild: function appendChild(newChild) {
+           return this.insertBefore(newChild, null);
+         },
+         hasChildNodes: function hasChildNodes() {
+           return this.firstChild != null;
+         },
+         cloneNode: function cloneNode(deep) {
+           return _cloneNode(this.ownerDocument || this, this, deep);
+         },
+         // Modified in DOM Level 2:
+         normalize: function normalize() {
+           var child = this.firstChild;
 
-               }, msec + 100);
+           while (child) {
+             var next = child.nextSibling;
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
+             if (next && next.nodeType == TEXT_NODE && child.nodeType == TEXT_NODE) {
+               this.removeChild(next);
+               child.appendData(next.data);
+             } else {
+               child.normalize();
+               child = next;
+             }
            }
+         },
+         // Introduced in DOM Level 2:
+         isSupported: function isSupported(feature, version) {
+           return this.ownerDocument.implementation.hasFeature(feature, version);
+         },
+         // Introduced in DOM Level 2:
+         hasAttributes: function hasAttributes() {
+           return this.attributes.length > 0;
+         },
+         lookupPrefix: function lookupPrefix(namespaceURI) {
+           var el = this;
 
+           while (el) {
+             var map = el._nsMap; //console.dir(map)
 
-           function updatePoint() {
-               if (context.mode().id !== 'select' || !_pointID || !context.hasEntity(_pointID)) {
-                   return continueTo(reselectPoint);
+             if (map) {
+               for (var n in map) {
+                 if (map[n] == namespaceURI) {
+                   return n;
+                 }
                }
+             }
 
-               // reset pane, in case user happened to untag the point..
-               context.container().select('.inspector-wrap .panewrap').style('right', '0%');
-
-               context.on('exit.intro', function() {
-                   continueTo(reselectPoint);
-               });
+             el = el.nodeType == ATTRIBUTE_NODE ? el.ownerDocument : el.parentNode;
+           }
 
-               context.history().on('change.intro', function() {
-                   continueTo(updateCloseEditor);
-               });
+           return null;
+         },
+         // Introduced in DOM Level 3:
+         lookupNamespaceURI: function lookupNamespaceURI(prefix) {
+           var el = this;
 
-               timeout(function() {
-                   reveal('.entity-editor-pane', helpString('intro.points.update'),
-                       { tooltipClass: 'intro-points-describe' }
-                   );
-               }, 400);
+           while (el) {
+             var map = el._nsMap; //console.dir(map)
 
-               function continueTo(nextStep) {
-                   context.on('exit.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
+             if (map) {
+               if (prefix in map) {
+                 return map[prefix];
                }
+             }
+
+             el = el.nodeType == ATTRIBUTE_NODE ? el.ownerDocument : el.parentNode;
            }
 
+           return null;
+         },
+         // Introduced in DOM Level 3:
+         isDefaultNamespace: function isDefaultNamespace(namespaceURI) {
+           var prefix = this.lookupPrefix(namespaceURI);
+           return prefix == null;
+         }
+       };
 
-           function updateCloseEditor() {
-               if (context.mode().id !== 'select' || !_pointID || !context.hasEntity(_pointID)) {
-                   return continueTo(reselectPoint);
-               }
+       function _xmlEncoder(c) {
+         return c == '<' && '&lt;' || c == '>' && '&gt;' || c == '&' && '&amp;' || c == '"' && '&quot;' || '&#' + c.charCodeAt() + ';';
+       }
 
-               // reset pane, in case user happened to change it..
-               context.container().select('.inspector-wrap .panewrap').style('right', '0%');
+       copy$1(NodeType, Node);
+       copy$1(NodeType, Node.prototype);
+       /**
+        * @param callback return true for continue,false for break
+        * @return boolean true: break visit;
+        */
 
-               context.on('exit.intro', function() {
-                   continueTo(rightClickPoint);
-               });
+       function _visitNode(node, callback) {
+         if (callback(node)) {
+           return true;
+         }
 
-               timeout(function() {
-                   reveal('.entity-editor-pane',
-                       helpString('intro.points.update_close', { button: icon('#iD-icon-close', 'pre-text') })
-                   );
-               }, 500);
+         if (node = node.firstChild) {
+           do {
+             if (_visitNode(node, callback)) {
+               return true;
+             }
+           } while (node = node.nextSibling);
+         }
+       }
 
-               function continueTo(nextStep) {
-                   context.on('exit.intro', null);
-                   nextStep();
-               }
-           }
+       function Document() {}
 
+       function _onAddAttribute(doc, el, newAttr) {
+         doc && doc._inc++;
+         var ns = newAttr.namespaceURI;
 
-           function rightClickPoint() {
-               if (!_pointID) return chapter.restart();
-               var entity = context.hasEntity(_pointID);
-               if (!entity) return chapter.restart();
+         if (ns == 'http://www.w3.org/2000/xmlns/') {
+           //update namespace
+           el._nsMap[newAttr.prefix ? newAttr.localName : ''] = newAttr.value;
+         }
+       }
 
-               context.enter(modeBrowse(context));
+       function _onRemoveAttribute(doc, el, newAttr, remove) {
+         doc && doc._inc++;
+         var ns = newAttr.namespaceURI;
 
-               var box = pointBox(entity.loc, context);
-               var textId = context.lastPointerType() === 'mouse' ? 'rightclick' : 'edit_menu_touch';
-               reveal(box, helpString('intro.points.' + textId), { duration: 600 });
-
-               timeout(function() {
-                   context.map().on('move.intro', function() {
-                       var entity = context.hasEntity(_pointID);
-                       if (!entity) return chapter.restart();
-                       var box = pointBox(entity.loc, context);
-                       reveal(box, helpString('intro.points.' + textId), { duration: 0 });
-                   });
-               }, 600); // after reveal
-
-               context.on('enter.intro', function(mode) {
-                   if (mode.id !== 'select') return;
-                   var ids = context.selectedIDs();
-                   if (ids.length !== 1 || ids[0] !== _pointID) return;
-
-                   timeout(function() {
-                       var node = selectMenuItem(context, 'delete').node();
-                       if (!node) return;
-                       continueTo(enterDelete);
-                   }, 50);  // after menu visible
-               });
+         if (ns == 'http://www.w3.org/2000/xmlns/') {
+           //update namespace
+           delete el._nsMap[newAttr.prefix ? newAttr.localName : ''];
+         }
+       }
 
-               function continueTo(nextStep) {
-                   context.on('enter.intro', null);
-                   context.map().on('move.intro', null);
-                   nextStep();
-               }
+       function _onUpdateChild(doc, el, newChild) {
+         if (doc && doc._inc) {
+           doc._inc++; //update childNodes
+
+           var cs = el.childNodes;
+
+           if (newChild) {
+             cs[cs.length++] = newChild;
+           } else {
+             //console.log(1)
+             var child = el.firstChild;
+             var i = 0;
+
+             while (child) {
+               cs[i++] = child;
+               child = child.nextSibling;
+             }
+
+             cs.length = i;
            }
+         }
+       }
+       /**
+        * attributes;
+        * children;
+        * 
+        * writeable properties:
+        * nodeValue,Attr:value,CharacterData:data
+        * prefix
+        */
 
 
-           function enterDelete() {
-               if (!_pointID) return chapter.restart();
-               var entity = context.hasEntity(_pointID);
-               if (!entity) return chapter.restart();
+       function _removeChild(parentNode, child) {
+         var previous = child.previousSibling;
+         var next = child.nextSibling;
 
-               var node = selectMenuItem(context, 'delete').node();
-               if (!node) { return continueTo(rightClickPoint); }
+         if (previous) {
+           previous.nextSibling = next;
+         } else {
+           parentNode.firstChild = next;
+         }
 
-               reveal('.edit-menu',
-                   helpString('intro.points.delete'),
-                   { padding: 50 }
-               );
+         if (next) {
+           next.previousSibling = previous;
+         } else {
+           parentNode.lastChild = previous;
+         }
 
-               timeout(function() {
-                   context.map().on('move.intro', function() {
-                       reveal('.edit-menu',
-                           helpString('intro.points.delete'),
-                           { duration: 0,  padding: 50 }
-                       );
-                   });
-               }, 300); // after menu visible
+         _onUpdateChild(parentNode.ownerDocument, parentNode);
 
-               context.on('exit.intro', function() {
-                   if (!_pointID) return chapter.restart();
-                   var entity = context.hasEntity(_pointID);
-                   if (entity) return continueTo(rightClickPoint);  // point still exists
-               });
+         return child;
+       }
+       /**
+        * preformance key(refChild == null)
+        */
 
-               context.history().on('change.intro', function(changed) {
-                   if (changed.deleted().length) {
-                       continueTo(undo);
-                   }
-               });
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro', null);
-                   context.history().on('change.intro', null);
-                   context.on('exit.intro', null);
-                   nextStep();
-               }
+       function _insertBefore(parentNode, newChild, nextChild) {
+         var cp = newChild.parentNode;
+
+         if (cp) {
+           cp.removeChild(newChild); //remove and update
+         }
+
+         if (newChild.nodeType === DOCUMENT_FRAGMENT_NODE) {
+           var newFirst = newChild.firstChild;
+
+           if (newFirst == null) {
+             return newChild;
            }
 
+           var newLast = newChild.lastChild;
+         } else {
+           newFirst = newLast = newChild;
+         }
 
-           function undo() {
-               context.history().on('change.intro', function() {
-                   continueTo(play);
-               });
+         var pre = nextChild ? nextChild.previousSibling : parentNode.lastChild;
+         newFirst.previousSibling = pre;
+         newLast.nextSibling = nextChild;
 
-               reveal('.top-toolbar button.undo-button',
-                   helpString('intro.points.undo')
-               );
+         if (pre) {
+           pre.nextSibling = newFirst;
+         } else {
+           parentNode.firstChild = newFirst;
+         }
 
-               function continueTo(nextStep) {
-                   context.history().on('change.intro', null);
-                   nextStep();
-               }
-           }
+         if (nextChild == null) {
+           parentNode.lastChild = newLast;
+         } else {
+           nextChild.previousSibling = newLast;
+         }
+
+         do {
+           newFirst.parentNode = parentNode;
+         } while (newFirst !== newLast && (newFirst = newFirst.nextSibling));
 
+         _onUpdateChild(parentNode.ownerDocument || parentNode, parentNode); //console.log(parentNode.lastChild.nextSibling == null)
 
-           function play() {
-               dispatch$1.call('done');
-               reveal('.ideditor',
-                   helpString('intro.points.play', { next: _t('intro.areas.title') }), {
-                       tooltipBox: '.intro-nav-wrap .chapter-area',
-                       buttonText: _t('intro.ok'),
-                       buttonCallback: function() { reveal('.ideditor'); }
-                   }
-               );
-           }
 
+         if (newChild.nodeType == DOCUMENT_FRAGMENT_NODE) {
+           newChild.firstChild = newChild.lastChild = null;
+         }
 
-           chapter.enter = function() {
-               addPoint();
-           };
+         return newChild;
+       }
 
+       function _appendSingleChild(parentNode, newChild) {
+         var cp = newChild.parentNode;
 
-           chapter.exit = function() {
-               timeouts.forEach(window.clearTimeout);
-               context.on('enter.intro exit.intro', null);
-               context.map().on('move.intro drawn.intro', null);
-               context.history().on('change.intro', null);
-               context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
-               context.container().select('.preset-search-input').on('keydown.intro keyup.intro', null);
-           };
+         if (cp) {
+           var pre = parentNode.lastChild;
+           cp.removeChild(newChild); //remove and update
 
+           var pre = parentNode.lastChild;
+         }
 
-           chapter.restart = function() {
-               chapter.exit();
-               chapter.enter();
-           };
+         var pre = parentNode.lastChild;
+         newChild.parentNode = parentNode;
+         newChild.previousSibling = pre;
+         newChild.nextSibling = null;
+
+         if (pre) {
+           pre.nextSibling = newChild;
+         } else {
+           parentNode.firstChild = newChild;
+         }
+
+         parentNode.lastChild = newChild;
 
+         _onUpdateChild(parentNode.ownerDocument, parentNode, newChild);
 
-           return utilRebind(chapter, dispatch$1, 'on');
+         return newChild; //console.log("__aa",parentNode.lastChild.nextSibling == null)
        }
 
-       function uiIntroArea(context, reveal) {
-           var dispatch$1 = dispatch('done');
-           var playground = [-85.63552, 41.94159];
-           var playgroundPreset = _mainPresetIndex.item('leisure/playground');
-           var nameField = _mainPresetIndex.field('name');
-           var descriptionField = _mainPresetIndex.field('description');
-           var timeouts = [];
-           var _areaID;
+       Document.prototype = {
+         //implementation : null,
+         nodeName: '#document',
+         nodeType: DOCUMENT_NODE,
+         doctype: null,
+         documentElement: null,
+         _inc: 1,
+         insertBefore: function insertBefore(newChild, refChild) {
+           //raises 
+           if (newChild.nodeType == DOCUMENT_FRAGMENT_NODE) {
+             var child = newChild.firstChild;
 
+             while (child) {
+               var next = child.nextSibling;
+               this.insertBefore(child, refChild);
+               child = next;
+             }
 
-           var chapter = {
-               title: 'intro.areas.title'
-           };
+             return newChild;
+           }
 
+           if (this.documentElement == null && newChild.nodeType == ELEMENT_NODE) {
+             this.documentElement = newChild;
+           }
 
-           function timeout(f, t) {
-               timeouts.push(window.setTimeout(f, t));
+           return _insertBefore(this, newChild, refChild), newChild.ownerDocument = this, newChild;
+         },
+         removeChild: function removeChild(oldChild) {
+           if (this.documentElement == oldChild) {
+             this.documentElement = null;
            }
 
+           return _removeChild(this, oldChild);
+         },
+         // Introduced in DOM Level 2:
+         importNode: function importNode(importedNode, deep) {
+           return _importNode(this, importedNode, deep);
+         },
+         // Introduced in DOM Level 2:
+         getElementById: function getElementById(id) {
+           var rtv = null;
+
+           _visitNode(this.documentElement, function (node) {
+             if (node.nodeType == ELEMENT_NODE) {
+               if (node.getAttribute('id') == id) {
+                 rtv = node;
+                 return true;
+               }
+             }
+           });
 
-           function eventCancel() {
-               event.stopPropagation();
-               event.preventDefault();
+           return rtv;
+         },
+         //document factory method:
+         createElement: function createElement(tagName) {
+           var node = new Element();
+           node.ownerDocument = this;
+           node.nodeName = tagName;
+           node.tagName = tagName;
+           node.childNodes = new NodeList();
+           var attrs = node.attributes = new NamedNodeMap();
+           attrs._ownerElement = node;
+           return node;
+         },
+         createDocumentFragment: function createDocumentFragment() {
+           var node = new DocumentFragment();
+           node.ownerDocument = this;
+           node.childNodes = new NodeList();
+           return node;
+         },
+         createTextNode: function createTextNode(data) {
+           var node = new Text();
+           node.ownerDocument = this;
+           node.appendData(data);
+           return node;
+         },
+         createComment: function createComment(data) {
+           var node = new Comment();
+           node.ownerDocument = this;
+           node.appendData(data);
+           return node;
+         },
+         createCDATASection: function createCDATASection(data) {
+           var node = new CDATASection();
+           node.ownerDocument = this;
+           node.appendData(data);
+           return node;
+         },
+         createProcessingInstruction: function createProcessingInstruction(target, data) {
+           var node = new ProcessingInstruction();
+           node.ownerDocument = this;
+           node.tagName = node.target = target;
+           node.nodeValue = node.data = data;
+           return node;
+         },
+         createAttribute: function createAttribute(name) {
+           var node = new Attr();
+           node.ownerDocument = this;
+           node.name = name;
+           node.nodeName = name;
+           node.localName = name;
+           node.specified = true;
+           return node;
+         },
+         createEntityReference: function createEntityReference(name) {
+           var node = new EntityReference();
+           node.ownerDocument = this;
+           node.nodeName = name;
+           return node;
+         },
+         // Introduced in DOM Level 2:
+         createElementNS: function createElementNS(namespaceURI, qualifiedName) {
+           var node = new Element();
+           var pl = qualifiedName.split(':');
+           var attrs = node.attributes = new NamedNodeMap();
+           node.childNodes = new NodeList();
+           node.ownerDocument = this;
+           node.nodeName = qualifiedName;
+           node.tagName = qualifiedName;
+           node.namespaceURI = namespaceURI;
+
+           if (pl.length == 2) {
+             node.prefix = pl[0];
+             node.localName = pl[1];
+           } else {
+             //el.prefix = null;
+             node.localName = qualifiedName;
            }
 
-
-           function revealPlayground(center, text, options) {
-               var padding = 180 * Math.pow(2, context.map().zoom() - 19.5);
-               var box = pad(center, padding, context);
-               reveal(box, text, options);
+           attrs._ownerElement = node;
+           return node;
+         },
+         // Introduced in DOM Level 2:
+         createAttributeNS: function createAttributeNS(namespaceURI, qualifiedName) {
+           var node = new Attr();
+           var pl = qualifiedName.split(':');
+           node.ownerDocument = this;
+           node.nodeName = qualifiedName;
+           node.name = qualifiedName;
+           node.namespaceURI = namespaceURI;
+           node.specified = true;
+
+           if (pl.length == 2) {
+             node.prefix = pl[0];
+             node.localName = pl[1];
+           } else {
+             //el.prefix = null;
+             node.localName = qualifiedName;
            }
 
+           return node;
+         }
+       };
 
-           function addArea() {
-               context.enter(modeBrowse(context));
-               context.history().reset('initial');
-               _areaID = null;
-
-               var msec = transitionTime(playground, context.map().center());
-               if (msec) { reveal(null, null, { duration: 0 }); }
-               context.map().centerZoomEase(playground, 19, msec);
-
-               timeout(function() {
-                   var tooltip = reveal('button.add-area',
-                       helpString('intro.areas.add_playground'));
-
-                   tooltip.selectAll('.popover-inner')
-                       .insert('svg', 'span')
-                       .attr('class', 'tooltip-illustration')
-                       .append('use')
-                       .attr('xlink:href', '#iD-graphic-areas');
-
-                   context.on('enter.intro', function(mode) {
-                       if (mode.id !== 'add-area') return;
-                       continueTo(startPlayground);
-                   });
-               }, msec + 100);
+       _extends(Document, Node);
 
-               function continueTo(nextStep) {
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
+       function Element() {
+         this._nsMap = {};
+       }
+       Element.prototype = {
+         nodeType: ELEMENT_NODE,
+         hasAttribute: function hasAttribute(name) {
+           return this.getAttributeNode(name) != null;
+         },
+         getAttribute: function getAttribute(name) {
+           var attr = this.getAttributeNode(name);
+           return attr && attr.value || '';
+         },
+         getAttributeNode: function getAttributeNode(name) {
+           return this.attributes.getNamedItem(name);
+         },
+         setAttribute: function setAttribute(name, value) {
+           var attr = this.ownerDocument.createAttribute(name);
+           attr.value = attr.nodeValue = "" + value;
+           this.setAttributeNode(attr);
+         },
+         removeAttribute: function removeAttribute(name) {
+           var attr = this.getAttributeNode(name);
+           attr && this.removeAttributeNode(attr);
+         },
+         //four real opeartion method
+         appendChild: function appendChild(newChild) {
+           if (newChild.nodeType === DOCUMENT_FRAGMENT_NODE) {
+             return this.insertBefore(newChild, null);
+           } else {
+             return _appendSingleChild(this, newChild);
            }
+         },
+         setAttributeNode: function setAttributeNode(newAttr) {
+           return this.attributes.setNamedItem(newAttr);
+         },
+         setAttributeNodeNS: function setAttributeNodeNS(newAttr) {
+           return this.attributes.setNamedItemNS(newAttr);
+         },
+         removeAttributeNode: function removeAttributeNode(oldAttr) {
+           //console.log(this == oldAttr.ownerElement)
+           return this.attributes.removeNamedItem(oldAttr.nodeName);
+         },
+         //get real attribute name,and remove it by removeAttributeNode
+         removeAttributeNS: function removeAttributeNS(namespaceURI, localName) {
+           var old = this.getAttributeNodeNS(namespaceURI, localName);
+           old && this.removeAttributeNode(old);
+         },
+         hasAttributeNS: function hasAttributeNS(namespaceURI, localName) {
+           return this.getAttributeNodeNS(namespaceURI, localName) != null;
+         },
+         getAttributeNS: function getAttributeNS(namespaceURI, localName) {
+           var attr = this.getAttributeNodeNS(namespaceURI, localName);
+           return attr && attr.value || '';
+         },
+         setAttributeNS: function setAttributeNS(namespaceURI, qualifiedName, value) {
+           var attr = this.ownerDocument.createAttributeNS(namespaceURI, qualifiedName);
+           attr.value = attr.nodeValue = "" + value;
+           this.setAttributeNode(attr);
+         },
+         getAttributeNodeNS: function getAttributeNodeNS(namespaceURI, localName) {
+           return this.attributes.getNamedItemNS(namespaceURI, localName);
+         },
+         getElementsByTagName: function getElementsByTagName(tagName) {
+           return new LiveNodeList(this, function (base) {
+             var ls = [];
 
-
-           function startPlayground() {
-               if (context.mode().id !== 'add-area') {
-                   return chapter.restart();
+             _visitNode(base, function (node) {
+               if (node !== base && node.nodeType == ELEMENT_NODE && (tagName === '*' || node.tagName == tagName)) {
+                 ls.push(node);
                }
+             });
 
-               _areaID = null;
-               context.map().zoomEase(19.5, 500);
+             return ls;
+           });
+         },
+         getElementsByTagNameNS: function getElementsByTagNameNS(namespaceURI, localName) {
+           return new LiveNodeList(this, function (base) {
+             var ls = [];
 
-               timeout(function() {
-                   var textId = context.lastPointerType() === 'mouse' ? 'starting_node_click' : 'starting_node_tap';
-                   var startDrawString = helpString('intro.areas.start_playground') + helpString('intro.areas.' + textId);
-                   revealPlayground(playground,
-                       startDrawString, { duration: 250 }
-                   );
+             _visitNode(base, function (node) {
+               if (node !== base && node.nodeType === ELEMENT_NODE && (namespaceURI === '*' || node.namespaceURI === namespaceURI) && (localName === '*' || node.localName == localName)) {
+                 ls.push(node);
+               }
+             });
 
-                   timeout(function() {
-                       context.map().on('move.intro drawn.intro', function() {
-                           revealPlayground(playground,
-                               startDrawString, { duration: 0 }
-                           );
-                       });
-                       context.on('enter.intro', function(mode) {
-                           if (mode.id !== 'draw-area') return chapter.restart();
-                           continueTo(continuePlayground);
-                       });
-                   }, 250);  // after reveal
+             return ls;
+           });
+         }
+       };
+       Document.prototype.getElementsByTagName = Element.prototype.getElementsByTagName;
+       Document.prototype.getElementsByTagNameNS = Element.prototype.getElementsByTagNameNS;
 
-               }, 550);  // after easing
+       _extends(Element, Node);
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
-           }
+       function Attr() {}
+       Attr.prototype.nodeType = ATTRIBUTE_NODE;
 
+       _extends(Attr, Node);
 
-           function continuePlayground() {
-               if (context.mode().id !== 'draw-area') {
-                   return chapter.restart();
-               }
+       function CharacterData() {}
+       CharacterData.prototype = {
+         data: '',
+         substringData: function substringData(offset, count) {
+           return this.data.substring(offset, offset + count);
+         },
+         appendData: function appendData(text) {
+           text = this.data + text;
+           this.nodeValue = this.data = text;
+           this.length = text.length;
+         },
+         insertData: function insertData(offset, text) {
+           this.replaceData(offset, 0, text);
+         },
+         appendChild: function appendChild(newChild) {
+           throw new Error(ExceptionMessage[HIERARCHY_REQUEST_ERR]);
+         },
+         deleteData: function deleteData(offset, count) {
+           this.replaceData(offset, count, "");
+         },
+         replaceData: function replaceData(offset, count, text) {
+           var start = this.data.substring(0, offset);
+           var end = this.data.substring(offset + count);
+           text = start + text + end;
+           this.nodeValue = this.data = text;
+           this.length = text.length;
+         }
+       };
 
-               _areaID = null;
-               revealPlayground(playground,
-                   helpString('intro.areas.continue_playground'),
-                   { duration: 250 }
-               );
+       _extends(CharacterData, Node);
 
-               timeout(function() {
-                   context.map().on('move.intro drawn.intro', function() {
-                       revealPlayground(playground,
-                           helpString('intro.areas.continue_playground'),
-                           { duration: 0 }
-                       );
-                   });
-               }, 250);  // after reveal
-
-               context.on('enter.intro', function(mode) {
-                   if (mode.id === 'draw-area') {
-                       var entity = context.hasEntity(context.selectedIDs()[0]);
-                       if (entity && entity.nodes.length >= 6) {
-                           return continueTo(finishPlayground);
-                       } else {
-                           return;
-                       }
-                   } else if (mode.id === 'select') {
-                       _areaID = context.selectedIDs()[0];
-                       return continueTo(searchPresets);
-                   } else {
-                       return chapter.restart();
-                   }
-               });
+       function Text() {}
+       Text.prototype = {
+         nodeName: "#text",
+         nodeType: TEXT_NODE,
+         splitText: function splitText(offset) {
+           var text = this.data;
+           var newText = text.substring(offset);
+           text = text.substring(0, offset);
+           this.data = this.nodeValue = text;
+           this.length = text.length;
+           var newNode = this.ownerDocument.createTextNode(newText);
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
+           if (this.parentNode) {
+             this.parentNode.insertBefore(newNode, this.nextSibling);
            }
 
+           return newNode;
+         }
+       };
 
-           function finishPlayground() {
-               if (context.mode().id !== 'draw-area') {
-                   return chapter.restart();
-               }
-
-               _areaID = null;
+       _extends(Text, CharacterData);
 
-               var finishString = helpString('intro.areas.finish_area_' + (context.lastPointerType() === 'mouse' ? 'click' : 'tap')) +
-                   helpString('intro.areas.finish_playground');
-               revealPlayground(playground,
-                   finishString, { duration: 250 }
-               );
+       function Comment() {}
+       Comment.prototype = {
+         nodeName: "#comment",
+         nodeType: COMMENT_NODE
+       };
 
-               timeout(function() {
-                   context.map().on('move.intro drawn.intro', function() {
-                       revealPlayground(playground,
-                           finishString, { duration: 0 }
-                       );
-                   });
-               }, 250);  // after reveal
+       _extends(Comment, CharacterData);
 
-               context.on('enter.intro', function(mode) {
-                   if (mode.id === 'draw-area') {
-                       return;
-                   } else if (mode.id === 'select') {
-                       _areaID = context.selectedIDs()[0];
-                       return continueTo(searchPresets);
-                   } else {
-                       return chapter.restart();
-                   }
-               });
+       function CDATASection() {}
+       CDATASection.prototype = {
+         nodeName: "#cdata-section",
+         nodeType: CDATA_SECTION_NODE
+       };
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
-           }
+       _extends(CDATASection, CharacterData);
 
+       function DocumentType() {}
+       DocumentType.prototype.nodeType = DOCUMENT_TYPE_NODE;
 
-           function searchPresets() {
-               if (!_areaID || !context.hasEntity(_areaID)) {
-                   return addArea();
-               }
-               var ids = context.selectedIDs();
-               if (context.mode().id !== 'select' || !ids.length || ids[0] !== _areaID) {
-                   context.enter(modeSelect(context, [_areaID]));
-               }
+       _extends(DocumentType, Node);
 
-               // disallow scrolling
-               context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+       function Notation() {}
+       Notation.prototype.nodeType = NOTATION_NODE;
 
-               timeout(function() {
-                   // reset pane, in case user somehow happened to change it..
-                   context.container().select('.inspector-wrap .panewrap').style('right', '-100%');
+       _extends(Notation, Node);
 
-                   context.container().select('.preset-search-input')
-                       .on('keydown.intro', null)
-                       .on('keyup.intro', checkPresetSearch);
+       function Entity() {}
+       Entity.prototype.nodeType = ENTITY_NODE;
 
-                   reveal('.preset-search-input',
-                       helpString('intro.areas.search_playground', { preset: playgroundPreset.name() })
-                   );
-               }, 400);  // after preset list pane visible..
+       _extends(Entity, Node);
 
-               context.on('enter.intro', function(mode) {
-                   if (!_areaID || !context.hasEntity(_areaID)) {
-                       return continueTo(addArea);
-                   }
+       function EntityReference() {}
+       EntityReference.prototype.nodeType = ENTITY_REFERENCE_NODE;
 
-                   var ids = context.selectedIDs();
-                   if (mode.id !== 'select' || !ids.length || ids[0] !== _areaID) {
-                       // keep the user's area selected..
-                       context.enter(modeSelect(context, [_areaID]));
+       _extends(EntityReference, Node);
 
-                       // reset pane, in case user somehow happened to change it..
-                       context.container().select('.inspector-wrap .panewrap').style('right', '-100%');
-                       // disallow scrolling
-                       context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+       function DocumentFragment() {}
+       DocumentFragment.prototype.nodeName = "#document-fragment";
+       DocumentFragment.prototype.nodeType = DOCUMENT_FRAGMENT_NODE;
 
-                       context.container().select('.preset-search-input')
-                           .on('keydown.intro', null)
-                           .on('keyup.intro', checkPresetSearch);
+       _extends(DocumentFragment, Node);
 
-                       reveal('.preset-search-input',
-                           helpString('intro.areas.search_playground', { preset: playgroundPreset.name() })
-                       );
+       function ProcessingInstruction() {}
 
-                       context.history().on('change.intro', null);
-                   }
-               });
+       ProcessingInstruction.prototype.nodeType = PROCESSING_INSTRUCTION_NODE;
 
-               function checkPresetSearch() {
-                   var first = context.container().select('.preset-list-item:first-child');
+       _extends(ProcessingInstruction, Node);
 
-                   if (first.classed('preset-leisure-playground')) {
-                       reveal(first.select('.preset-list-button').node(),
-                           helpString('intro.areas.choose_playground', { preset: playgroundPreset.name() }),
-                           { duration: 300 }
-                       );
+       function XMLSerializer$1() {}
 
-                       context.container().select('.preset-search-input')
-                           .on('keydown.intro', eventCancel, true)
-                           .on('keyup.intro', null);
+       XMLSerializer$1.prototype.serializeToString = function (node, isHtml, nodeFilter) {
+         return nodeSerializeToString.call(node, isHtml, nodeFilter);
+       };
 
-                       context.history().on('change.intro', function() {
-                           continueTo(clickAddField);
-                       });
-                   }
-               }
+       Node.prototype.toString = nodeSerializeToString;
 
-               function continueTo(nextStep) {
-                   context.container().select('.inspector-wrap').on('wheel.intro', null);
-                   context.on('enter.intro', null);
-                   context.history().on('change.intro', null);
-                   context.container().select('.preset-search-input').on('keydown.intro keyup.intro', null);
-                   nextStep();
-               }
+       function nodeSerializeToString(isHtml, nodeFilter) {
+         var buf = [];
+         var refNode = this.nodeType == 9 ? this.documentElement : this;
+         var prefix = refNode.prefix;
+         var uri = refNode.namespaceURI;
+
+         if (uri && prefix == null) {
+           //console.log(prefix)
+           var prefix = refNode.lookupPrefix(uri);
+
+           if (prefix == null) {
+             //isHTML = true;
+             var visibleNamespaces = [{
+               namespace: uri,
+               prefix: null
+             } //{namespace:uri,prefix:''}
+             ];
            }
+         }
 
+         serializeToString(this, buf, isHtml, nodeFilter, visibleNamespaces); //console.log('###',this.nodeType,uri,prefix,buf.join(''))
 
-           function clickAddField() {
-               if (!_areaID || !context.hasEntity(_areaID)) {
-                   return addArea();
-               }
-               var ids = context.selectedIDs();
-               if (context.mode().id !== 'select' || !ids.length || ids[0] !== _areaID) {
-                   return searchPresets();
-               }
-
-               if (!context.container().select('.form-field-description').empty()) {
-                   return continueTo(describePlayground);
-               }
-
-               // disallow scrolling
-               context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
-
-               timeout(function() {
-                   // reset pane, in case user somehow happened to change it..
-                   context.container().select('.inspector-wrap .panewrap').style('right', '0%');
-
-                   // It's possible for the user to add a description in a previous step..
-                   // If they did this already, just continue to next step.
-                   var entity = context.entity(_areaID);
-                   if (entity.tags.description) {
-                       return continueTo(play);
-                   }
+         return buf.join('');
+       }
 
-                   // scroll "Add field" into view
-                   var box = context.container().select('.more-fields').node().getBoundingClientRect();
-                   if (box.top > 300) {
-                       var pane = context.container().select('.entity-editor-pane .inspector-body');
-                       var start = pane.node().scrollTop;
-                       var end = start + (box.top - 300);
-
-                       pane
-                           .transition()
-                           .duration(250)
-                           .tween('scroll.inspector', function() {
-                               var node = this;
-                               var i = d3_interpolateNumber(start, end);
-                               return function(t) {
-                                   node.scrollTop = i(t);
-                               };
-                           });
-                   }
+       function needNamespaceDefine(node, isHTML, visibleNamespaces) {
+         var prefix = node.prefix || '';
+         var uri = node.namespaceURI;
 
-                   timeout(function() {
-                       reveal('.more-fields .combobox-input',
-                           helpString('intro.areas.add_field', {
-                               name: nameField.label(),
-                               description: descriptionField.label()
-                           }),
-                           { duration: 300 }
-                       );
+         if (!prefix && !uri) {
+           return false;
+         }
 
-                       context.container().select('.more-fields .combobox-input')
-                           .on('click.intro', function() {
-                               // Watch for the combobox to appear...
-                               var watcher;
-                               watcher = window.setInterval(function() {
-                                   if (!context.container().select('div.combobox').empty()) {
-                                       window.clearInterval(watcher);
-                                       continueTo(chooseDescriptionField);
-                                   }
-                               }, 300);
-                           });
-                   }, 300);  // after "Add Field" visible
+         if (prefix === "xml" && uri === "http://www.w3.org/XML/1998/namespace" || uri == 'http://www.w3.org/2000/xmlns/') {
+           return false;
+         }
 
-               }, 400);  // after editor pane visible
+         var i = visibleNamespaces.length; //console.log('@@@@',node.tagName,prefix,uri,visibleNamespaces)
 
-               context.on('exit.intro', function() {
-                   return continueTo(searchPresets);
-               });
+         while (i--) {
+           var ns = visibleNamespaces[i]; // get namespace prefix
+           //console.log(node.nodeType,node.tagName,ns.prefix,prefix)
 
-               function continueTo(nextStep) {
-                   context.container().select('.inspector-wrap').on('wheel.intro', null);
-                   context.container().select('.more-fields .combobox-input').on('click.intro', null);
-                   context.on('exit.intro', null);
-                   nextStep();
-               }
+           if (ns.prefix == prefix) {
+             return ns.namespace != uri;
            }
+         } //console.log(isHTML,uri,prefix=='')
+         //if(isHTML && prefix ==null && uri == 'http://www.w3.org/1999/xhtml'){
+         //    return false;
+         //}
+         //node.flag = '11111'
+         //console.error(3,true,node.flag,node.prefix,node.namespaceURI)
 
 
-           function chooseDescriptionField() {
-               if (!_areaID || !context.hasEntity(_areaID)) {
-                   return addArea();
-               }
-               var ids = context.selectedIDs();
-               if (context.mode().id !== 'select' || !ids.length || ids[0] !== _areaID) {
-                   return searchPresets();
-               }
+         return true;
+       }
 
-               if (!context.container().select('.form-field-description').empty()) {
-                   return continueTo(describePlayground);
-               }
+       function serializeToString(node, buf, isHTML, nodeFilter, visibleNamespaces) {
+         if (nodeFilter) {
+           node = nodeFilter(node);
 
-               // Make sure combobox is ready..
-               if (context.container().select('div.combobox').empty()) {
-                   return continueTo(clickAddField);
-               }
-               // Watch for the combobox to go away..
-               var watcher;
-               watcher = window.setInterval(function() {
-                   if (context.container().select('div.combobox').empty()) {
-                       window.clearInterval(watcher);
-                       timeout(function() {
-                           if (context.container().select('.form-field-description').empty()) {
-                               continueTo(retryChooseDescription);
-                           } else {
-                               continueTo(describePlayground);
-                           }
-                       }, 300);  // after description field added.
-                   }
-               }, 300);
+           if (node) {
+             if (typeof node == 'string') {
+               buf.push(node);
+               return;
+             }
+           } else {
+             return;
+           } //buf.sort.apply(attrs, attributeSorter);
 
-               reveal('div.combobox',
-                   helpString('intro.areas.choose_field', { field: descriptionField.label() }),
-                   { duration: 300 }
-               );
+         }
 
-               context.on('exit.intro', function() {
-                   return continueTo(searchPresets);
-               });
+         switch (node.nodeType) {
+           case ELEMENT_NODE:
+             if (!visibleNamespaces) visibleNamespaces = [];
+             var startVisibleNamespaces = visibleNamespaces.length;
+             var attrs = node.attributes;
+             var len = attrs.length;
+             var child = node.firstChild;
+             var nodeName = node.tagName;
+             isHTML = htmlns === node.namespaceURI || isHTML;
+             buf.push('<', nodeName);
 
-               function continueTo(nextStep) {
-                   if (watcher) window.clearInterval(watcher);
-                   context.on('exit.intro', null);
-                   nextStep();
+             for (var i = 0; i < len; i++) {
+               // add namespaces for attributes
+               var attr = attrs.item(i);
+
+               if (attr.prefix == 'xmlns') {
+                 visibleNamespaces.push({
+                   prefix: attr.localName,
+                   namespace: attr.value
+                 });
+               } else if (attr.nodeName == 'xmlns') {
+                 visibleNamespaces.push({
+                   prefix: '',
+                   namespace: attr.value
+                 });
                }
-           }
+             }
 
+             for (var i = 0; i < len; i++) {
+               var attr = attrs.item(i);
 
-           function describePlayground() {
-               if (!_areaID || !context.hasEntity(_areaID)) {
-                   return addArea();
-               }
-               var ids = context.selectedIDs();
-               if (context.mode().id !== 'select' || !ids.length || ids[0] !== _areaID) {
-                   return searchPresets();
+               if (needNamespaceDefine(attr, isHTML, visibleNamespaces)) {
+                 var prefix = attr.prefix || '';
+                 var uri = attr.namespaceURI;
+                 var ns = prefix ? ' xmlns:' + prefix : " xmlns";
+                 buf.push(ns, '="', uri, '"');
+                 visibleNamespaces.push({
+                   prefix: prefix,
+                   namespace: uri
+                 });
                }
 
-               // reset pane, in case user happened to change it..
-               context.container().select('.inspector-wrap .panewrap').style('right', '0%');
+               serializeToString(attr, buf, isHTML, nodeFilter, visibleNamespaces);
+             } // add namespace for current node               
 
-               if (context.container().select('.form-field-description').empty()) {
-                   return continueTo(retryChooseDescription);
-               }
 
-               context.on('exit.intro', function() {
-                   continueTo(play);
+             if (needNamespaceDefine(node, isHTML, visibleNamespaces)) {
+               var prefix = node.prefix || '';
+               var uri = node.namespaceURI;
+               var ns = prefix ? ' xmlns:' + prefix : " xmlns";
+               buf.push(ns, '="', uri, '"');
+               visibleNamespaces.push({
+                 prefix: prefix,
+                 namespace: uri
                });
+             }
 
-               reveal('.entity-editor-pane',
-                   helpString('intro.areas.describe_playground', { button: icon('#iD-icon-close', 'pre-text') }),
-                   { duration: 300 }
-               );
-
-               function continueTo(nextStep) {
-                   context.on('exit.intro', null);
-                   nextStep();
-               }
-           }
+             if (child || isHTML && !/^(?:meta|link|img|br|hr|input)$/i.test(nodeName)) {
+               buf.push('>'); //if is cdata child node
 
+               if (isHTML && /^script$/i.test(nodeName)) {
+                 while (child) {
+                   if (child.data) {
+                     buf.push(child.data);
+                   } else {
+                     serializeToString(child, buf, isHTML, nodeFilter, visibleNamespaces);
+                   }
 
-           function retryChooseDescription() {
-               if (!_areaID || !context.hasEntity(_areaID)) {
-                   return addArea();
-               }
-               var ids = context.selectedIDs();
-               if (context.mode().id !== 'select' || !ids.length || ids[0] !== _areaID) {
-                   return searchPresets();
+                   child = child.nextSibling;
+                 }
+               } else {
+                 while (child) {
+                   serializeToString(child, buf, isHTML, nodeFilter, visibleNamespaces);
+                   child = child.nextSibling;
+                 }
                }
 
-               // reset pane, in case user happened to change it..
-               context.container().select('.inspector-wrap .panewrap').style('right', '0%');
-
-               reveal('.entity-editor-pane',
-                   helpString('intro.areas.retry_add_field', { field: descriptionField.label() }), {
-                   buttonText: _t('intro.ok'),
-                   buttonCallback: function() { continueTo(clickAddField); }
-               });
+               buf.push('</', nodeName, '>');
+             } else {
+               buf.push('/>');
+             } // remove added visible namespaces
+             //visibleNamespaces.length = startVisibleNamespaces;
 
-               context.on('exit.intro', function() {
-                   return continueTo(searchPresets);
-               });
 
-               function continueTo(nextStep) {
-                   context.on('exit.intro', null);
-                   nextStep();
-               }
-           }
+             return;
 
+           case DOCUMENT_NODE:
+           case DOCUMENT_FRAGMENT_NODE:
+             var child = node.firstChild;
 
-           function play() {
-               dispatch$1.call('done');
-               reveal('.ideditor',
-                   helpString('intro.areas.play', { next: _t('intro.lines.title') }), {
-                       tooltipBox: '.intro-nav-wrap .chapter-line',
-                       buttonText: _t('intro.ok'),
-                       buttonCallback: function() { reveal('.ideditor'); }
-                   }
-               );
-           }
+             while (child) {
+               serializeToString(child, buf, isHTML, nodeFilter, visibleNamespaces);
+               child = child.nextSibling;
+             }
 
+             return;
 
-           chapter.enter = function() {
-               addArea();
-           };
+           case ATTRIBUTE_NODE:
+             return buf.push(' ', node.name, '="', node.value.replace(/[<&"]/g, _xmlEncoder), '"');
 
+           case TEXT_NODE:
+             return buf.push(node.data.replace(/[<&]/g, _xmlEncoder));
 
-           chapter.exit = function() {
-               timeouts.forEach(window.clearTimeout);
-               context.on('enter.intro exit.intro', null);
-               context.map().on('move.intro drawn.intro', null);
-               context.history().on('change.intro', null);
-               context.container().select('.inspector-wrap').on('wheel.intro', null);
-               context.container().select('.preset-search-input').on('keydown.intro keyup.intro', null);
-               context.container().select('.more-fields .combobox-input').on('click.intro', null);
-           };
+           case CDATA_SECTION_NODE:
+             return buf.push('<![CDATA[', node.data, ']]>');
 
+           case COMMENT_NODE:
+             return buf.push("<!--", node.data, "-->");
 
-           chapter.restart = function() {
-               chapter.exit();
-               chapter.enter();
-           };
+           case DOCUMENT_TYPE_NODE:
+             var pubid = node.publicId;
+             var sysid = node.systemId;
+             buf.push('<!DOCTYPE ', node.name);
 
+             if (pubid) {
+               buf.push(' PUBLIC "', pubid);
 
-           return utilRebind(chapter, dispatch$1, 'on');
-       }
+               if (sysid && sysid != '.') {
+                 buf.push('" "', sysid);
+               }
 
-       function uiIntroLine(context, reveal) {
-           var dispatch$1 = dispatch('done');
-           var timeouts = [];
-           var _tulipRoadID = null;
-           var flowerRoadID = 'w646';
-           var tulipRoadStart = [-85.6297754121684, 41.95805253325314];
-           var tulipRoadMidpoint = [-85.62975395449628, 41.95787501510204];
-           var tulipRoadIntersection = [-85.62974496187628, 41.95742515554585];
-           var roadCategory = _mainPresetIndex.item('category-road_minor');
-           var residentialPreset = _mainPresetIndex.item('highway/residential');
-           var woodRoadID = 'w525';
-           var woodRoadEndID = 'n2862';
-           var woodRoadAddNode = [-85.62390110349587, 41.95397111462291];
-           var woodRoadDragEndpoint = [-85.623867390213, 41.95466987786487];
-           var woodRoadDragMidpoint = [-85.62386254803509, 41.95430395953872];
-           var washingtonStreetID = 'w522';
-           var twelfthAvenueID = 'w1';
-           var eleventhAvenueEndID = 'n3550';
-           var twelfthAvenueEndID = 'n5';
-           var _washingtonSegmentID = null;
-           var eleventhAvenueEnd = context.entity(eleventhAvenueEndID).loc;
-           var twelfthAvenueEnd = context.entity(twelfthAvenueEndID).loc;
-           var deleteLinesLoc = [-85.6219395542764, 41.95228033922477];
-           var twelfthAvenue = [-85.62219310052491, 41.952505413152956];
-
-
-           var chapter = {
-               title: 'intro.lines.title'
-           };
+               buf.push('">');
+             } else if (sysid && sysid != '.') {
+               buf.push(' SYSTEM "', sysid, '">');
+             } else {
+               var sub = node.internalSubset;
 
+               if (sub) {
+                 buf.push(" [", sub, "]");
+               }
 
-           function timeout(f, t) {
-               timeouts.push(window.setTimeout(f, t));
-           }
+               buf.push(">");
+             }
 
+             return;
 
-           function eventCancel() {
-               event.stopPropagation();
-               event.preventDefault();
-           }
+           case PROCESSING_INSTRUCTION_NODE:
+             return buf.push("<?", node.target, " ", node.data, "?>");
 
+           case ENTITY_REFERENCE_NODE:
+             return buf.push('&', node.nodeName, ';');
+           //case ENTITY_NODE:
+           //case NOTATION_NODE:
 
-           function addLine() {
-               context.enter(modeBrowse(context));
-               context.history().reset('initial');
+           default:
+             buf.push('??', node.nodeName);
+         }
+       }
 
-               var msec = transitionTime(tulipRoadStart, context.map().center());
-               if (msec) { reveal(null, null, { duration: 0 }); }
-               context.map().centerZoomEase(tulipRoadStart, 18.5, msec);
+       function _importNode(doc, node, deep) {
+         var node2;
 
-               timeout(function() {
-                   var tooltip = reveal('button.add-line',
-                       helpString('intro.lines.add_line'));
+         switch (node.nodeType) {
+           case ELEMENT_NODE:
+             node2 = node.cloneNode(false);
+             node2.ownerDocument = doc;
+           //var attrs = node2.attributes;
+           //var len = attrs.length;
+           //for(var i=0;i<len;i++){
+           //node2.setAttributeNodeNS(importNode(doc,attrs.item(i),deep));
+           //}
 
-                   tooltip.selectAll('.popover-inner')
-                       .insert('svg', 'span')
-                       .attr('class', 'tooltip-illustration')
-                       .append('use')
-                       .attr('xlink:href', '#iD-graphic-lines');
+           case DOCUMENT_FRAGMENT_NODE:
+             break;
 
-                   context.on('enter.intro', function(mode) {
-                       if (mode.id !== 'add-line') return;
-                       continueTo(startLine);
-                   });
-               }, msec + 100);
+           case ATTRIBUTE_NODE:
+             deep = true;
+             break;
+           //case ENTITY_REFERENCE_NODE:
+           //case PROCESSING_INSTRUCTION_NODE:
+           ////case TEXT_NODE:
+           //case CDATA_SECTION_NODE:
+           //case COMMENT_NODE:
+           //  deep = false;
+           //  break;
+           //case DOCUMENT_NODE:
+           //case DOCUMENT_TYPE_NODE:
+           //cannot be imported.
+           //case ENTITY_NODE:
+           //case NOTATION_NODE:
+           //can not hit in level3
+           //default:throw e;
+         }
 
-               function continueTo(nextStep) {
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
-           }
+         if (!node2) {
+           node2 = node.cloneNode(false); //false
+         }
 
+         node2.ownerDocument = doc;
+         node2.parentNode = null;
 
-           function startLine() {
-               if (context.mode().id !== 'add-line') return chapter.restart();
+         if (deep) {
+           var child = node.firstChild;
 
-               _tulipRoadID = null;
+           while (child) {
+             node2.appendChild(_importNode(doc, child, deep));
+             child = child.nextSibling;
+           }
+         }
 
-               var padding = 70 * Math.pow(2, context.map().zoom() - 18);
-               var box = pad(tulipRoadStart, padding, context);
-               box.height = box.height + 100;
+         return node2;
+       } //
+       //var _relationMap = {firstChild:1,lastChild:1,previousSibling:1,nextSibling:1,
+       //                                      attributes:1,childNodes:1,parentNode:1,documentElement:1,doctype,};
 
-               var textId = context.lastPointerType() === 'mouse' ? 'start_line' : 'start_line_tap';
-               var startLineString = helpString('intro.lines.missing_road') + '{br}' +
-                   helpString('intro.lines.line_draw_info') +
-                   helpString('intro.lines.' + textId);
-               reveal(box, startLineString);
 
-               context.map().on('move.intro drawn.intro', function() {
-                   padding = 70 * Math.pow(2, context.map().zoom() - 18);
-                   box = pad(tulipRoadStart, padding, context);
-                   box.height = box.height + 100;
-                   reveal(box, startLineString, { duration: 0 });
-               });
+       function _cloneNode(doc, node, deep) {
+         var node2 = new node.constructor();
 
-               context.on('enter.intro', function(mode) {
-                   if (mode.id !== 'draw-line') return chapter.restart();
-                   continueTo(drawLine);
-               });
+         for (var n in node) {
+           var v = node[n];
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
+           if (_typeof(v) != 'object') {
+             if (v != node2[n]) {
+               node2[n] = v;
+             }
            }
+         }
 
+         if (node.childNodes) {
+           node2.childNodes = new NodeList();
+         }
 
-           function drawLine() {
-               if (context.mode().id !== 'draw-line') return chapter.restart();
+         node2.ownerDocument = doc;
 
-               _tulipRoadID = context.mode().selectedIDs()[0];
-               context.map().centerEase(tulipRoadMidpoint, 500);
+         switch (node2.nodeType) {
+           case ELEMENT_NODE:
+             var attrs = node.attributes;
+             var attrs2 = node2.attributes = new NamedNodeMap();
+             var len = attrs.length;
+             attrs2._ownerElement = node2;
 
-               timeout(function() {
-                   var padding = 200 * Math.pow(2, context.map().zoom() - 18.5);
-                   var box = pad(tulipRoadMidpoint, padding, context);
-                   box.height = box.height * 2;
-                   reveal(box,
-                       helpString('intro.lines.intersect', { name: _t('intro.graph.name.flower-street') })
-                   );
+             for (var i = 0; i < len; i++) {
+               node2.setAttributeNode(_cloneNode(doc, attrs.item(i), true));
+             }
 
-                   context.map().on('move.intro drawn.intro', function() {
-                       padding = 200 * Math.pow(2, context.map().zoom() - 18.5);
-                       box = pad(tulipRoadMidpoint, padding, context);
-                       box.height = box.height * 2;
-                       reveal(box,
-                           helpString('intro.lines.intersect', { name: _t('intro.graph.name.flower-street') }),
-                           { duration: 0 }
-                       );
-                   });
-               }, 550);  // after easing..
+             break;
 
-               context.history().on('change.intro', function() {
-                   if (isLineConnected()) {
-                       continueTo(continueLine);
-                   }
-               });
+           case ATTRIBUTE_NODE:
+             deep = true;
+         }
 
-               context.on('enter.intro', function(mode) {
-                   if (mode.id === 'draw-line') {
-                       return;
-                   } else if (mode.id === 'select') {
-                       continueTo(retryIntersect);
-                       return;
-                   } else {
-                       return chapter.restart();
-                   }
-               });
+         if (deep) {
+           var child = node.firstChild;
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.history().on('change.intro', null);
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
+           while (child) {
+             node2.appendChild(_cloneNode(doc, child, deep));
+             child = child.nextSibling;
            }
+         }
 
+         return node2;
+       }
 
-           function isLineConnected() {
-               var entity = _tulipRoadID && context.hasEntity(_tulipRoadID);
-               if (!entity) return false;
-
-               var drawNodes = context.graph().childNodes(entity);
-               return drawNodes.some(function(node) {
-                   return context.graph().parentWays(node).some(function(parent) {
-                       return parent.id === flowerRoadID;
-                   });
-               });
-           }
+       function __set__(object, key, value) {
+         object[key] = value;
+       } //do dynamic
 
 
-           function retryIntersect() {
-               select(window).on('pointerdown.intro mousedown.intro', eventCancel, true);
+       try {
+         if (Object.defineProperty) {
+           var getTextContent = function getTextContent(node) {
+             switch (node.nodeType) {
+               case ELEMENT_NODE:
+               case DOCUMENT_FRAGMENT_NODE:
+                 var buf = [];
+                 node = node.firstChild;
 
-               var box = pad(tulipRoadIntersection, 80, context);
-               reveal(box,
-                   helpString('intro.lines.retry_intersect', { name: _t('intro.graph.name.flower-street') })
-               );
+                 while (node) {
+                   if (node.nodeType !== 7 && node.nodeType !== 8) {
+                     buf.push(getTextContent(node));
+                   }
 
-               timeout(chapter.restart, 3000);
-           }
+                   node = node.nextSibling;
+                 }
 
+                 return buf.join('');
 
-           function continueLine() {
-               if (context.mode().id !== 'draw-line') return chapter.restart();
-               var entity = _tulipRoadID && context.hasEntity(_tulipRoadID);
-               if (!entity) return chapter.restart();
+               default:
+                 return node.nodeValue;
+             }
+           };
 
-               context.map().centerEase(tulipRoadIntersection, 500);
+           Object.defineProperty(LiveNodeList.prototype, 'length', {
+             get: function get() {
+               _updateLiveList(this);
 
-               var continueLineText = helpString('intro.lines.continue_line') + '{br}' +
-                   helpString('intro.lines.finish_line_' + (context.lastPointerType() === 'mouse' ? 'click' : 'tap')) +
-                   helpString('intro.lines.finish_road');
+               return this.$$length;
+             }
+           });
+           Object.defineProperty(Node.prototype, 'textContent', {
+             get: function get() {
+               return getTextContent(this);
+             },
+             set: function set(data) {
+               switch (this.nodeType) {
+                 case ELEMENT_NODE:
+                 case DOCUMENT_FRAGMENT_NODE:
+                   while (this.firstChild) {
+                     this.removeChild(this.firstChild);
+                   }
 
-               reveal('.surface', continueLineText);
+                   if (data || String(data)) {
+                     this.appendChild(this.ownerDocument.createTextNode(data));
+                   }
 
-               context.on('enter.intro', function(mode) {
-                   if (mode.id === 'draw-line')
-                       return;
-                   else if (mode.id === 'select')
-                       return continueTo(chooseCategoryRoad);
-                   else
-                       return chapter.restart();
-               });
+                   break;
 
-               function continueTo(nextStep) {
-                   context.on('enter.intro', null);
-                   nextStep();
+                 default:
+                   //TODO:
+                   this.data = data;
+                   this.value = data;
+                   this.nodeValue = data;
                }
-           }
-
-
-           function chooseCategoryRoad() {
-               if (context.mode().id !== 'select') return chapter.restart();
+             }
+           });
 
-               context.on('exit.intro', function() {
-                   return chapter.restart();
-               });
+           __set__ = function __set__(object, key, value) {
+             //console.log(value)
+             object['$$' + key] = value;
+           };
+         }
+       } catch (e) {//ie8
+       } //if(typeof require == 'function'){
 
-               var button = context.container().select('.preset-category-road_minor .preset-list-button');
-               if (button.empty()) return chapter.restart();
 
-               // disallow scrolling
-               context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+       var DOMImplementation_1 = DOMImplementation;
+       var XMLSerializer_1 = XMLSerializer$1; //}
 
-               timeout(function() {
-                   // reset pane, in case user somehow happened to change it..
-                   context.container().select('.inspector-wrap .panewrap').style('right', '-100%');
+       var dom = {
+         DOMImplementation: DOMImplementation_1,
+         XMLSerializer: XMLSerializer_1
+       };
 
-                   reveal(button.node(),
-                       helpString('intro.lines.choose_category_road', { category: roadCategory.name() })
-                   );
+       var domParser = createCommonjsModule(function (module, exports) {
+         function DOMParser(options) {
+           this.options = options || {
+             locator: {}
+           };
+         }
 
-                   button.on('click.intro', function() {
-                       continueTo(choosePresetResidential);
-                   });
+         DOMParser.prototype.parseFromString = function (source, mimeType) {
+           var options = this.options;
+           var sax = new XMLReader();
+           var domBuilder = options.domBuilder || new DOMHandler(); //contentHandler and LexicalHandler
 
-               }, 400);  // after editor pane visible
+           var errorHandler = options.errorHandler;
+           var locator = options.locator;
+           var defaultNSMap = options.xmlns || {};
+           var entityMap = {
+             'lt': '<',
+             'gt': '>',
+             'amp': '&',
+             'quot': '"',
+             'apos': "'"
+           };
 
-               function continueTo(nextStep) {
-                   context.container().select('.inspector-wrap').on('wheel.intro', null);
-                   context.container().select('.preset-list-button').on('click.intro', null);
-                   context.on('exit.intro', null);
-                   nextStep();
-               }
+           if (locator) {
+             domBuilder.setDocumentLocator(locator);
            }
 
+           sax.errorHandler = buildErrorHandler(errorHandler, domBuilder, locator);
+           sax.domBuilder = options.domBuilder || domBuilder;
 
-           function choosePresetResidential() {
-               if (context.mode().id !== 'select') return chapter.restart();
-
-               context.on('exit.intro', function() {
-                   return chapter.restart();
-               });
-
-               var subgrid = context.container().select('.preset-category-road_minor .subgrid');
-               if (subgrid.empty()) return chapter.restart();
-
-               subgrid.selectAll(':not(.preset-highway-residential) .preset-list-button')
-                   .on('click.intro', function() {
-                       continueTo(retryPresetResidential);
-                   });
-
-               subgrid.selectAll('.preset-highway-residential .preset-list-button')
-                   .on('click.intro', function() {
-                       continueTo(nameRoad);
-                   });
-
-               timeout(function() {
-                   reveal(subgrid.node(),
-                       helpString('intro.lines.choose_preset_residential', { preset: residentialPreset.name() }),
-                       { tooltipBox: '.preset-highway-residential .preset-list-button', duration: 300 }
-                   );
-               }, 300);
-
-               function continueTo(nextStep) {
-                   context.container().select('.preset-list-button').on('click.intro', null);
-                   context.on('exit.intro', null);
-                   nextStep();
-               }
+           if (/\/x?html?$/.test(mimeType)) {
+             entityMap.nbsp = '\xa0';
+             entityMap.copy = '\xa9';
+             defaultNSMap[''] = 'http://www.w3.org/1999/xhtml';
            }
 
+           defaultNSMap.xml = defaultNSMap.xml || 'http://www.w3.org/XML/1998/namespace';
 
-           // selected wrong road type
-           function retryPresetResidential() {
-               if (context.mode().id !== 'select') return chapter.restart();
+           if (source) {
+             sax.parse(source, defaultNSMap, entityMap);
+           } else {
+             sax.errorHandler.error("invalid doc source");
+           }
 
-               context.on('exit.intro', function() {
-                   return chapter.restart();
-               });
+           return domBuilder.doc;
+         };
 
-               // disallow scrolling
-               context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+         function buildErrorHandler(errorImpl, domBuilder, locator) {
+           if (!errorImpl) {
+             if (domBuilder instanceof DOMHandler) {
+               return domBuilder;
+             }
 
-               timeout(function() {
-                   var button = context.container().select('.entity-editor-pane .preset-list-button');
+             errorImpl = domBuilder;
+           }
 
-                   reveal(button.node(),
-                       helpString('intro.lines.retry_preset_residential', { preset: residentialPreset.name() })
-                   );
+           var errorHandler = {};
+           var isCallback = errorImpl instanceof Function;
+           locator = locator || {};
 
-                   button.on('click.intro', function() {
-                       continueTo(chooseCategoryRoad);
-                   });
+           function build(key) {
+             var fn = errorImpl[key];
 
-               }, 500);
+             if (!fn && isCallback) {
+               fn = errorImpl.length == 2 ? function (msg) {
+                 errorImpl(key, msg);
+               } : errorImpl;
+             }
 
-               function continueTo(nextStep) {
-                   context.container().select('.inspector-wrap').on('wheel.intro', null);
-                   context.container().select('.preset-list-button').on('click.intro', null);
-                   context.on('exit.intro', null);
-                   nextStep();
-               }
+             errorHandler[key] = fn && function (msg) {
+               fn('[xmldom ' + key + ']\t' + msg + _locator(locator));
+             } || function () {};
            }
 
+           build('warning');
+           build('error');
+           build('fatalError');
+           return errorHandler;
+         } //console.log('#\n\n\n\n\n\n\n####')
 
-           function nameRoad() {
-               context.on('exit.intro', function() {
-                   continueTo(didNameRoad);
-               });
+         /**
+          * +ContentHandler+ErrorHandler
+          * +LexicalHandler+EntityResolver2
+          * -DeclHandler-DTDHandler 
+          * 
+          * DefaultHandler:EntityResolver, DTDHandler, ContentHandler, ErrorHandler
+          * DefaultHandler2:DefaultHandler,LexicalHandler, DeclHandler, EntityResolver2
+          * @link http://www.saxproject.org/apidoc/org/xml/sax/helpers/DefaultHandler.html
+          */
 
-               timeout(function() {
-                   reveal('.entity-editor-pane',
-                       helpString('intro.lines.name_road', { button: icon('#iD-icon-close', 'pre-text') }),
-                       { tooltipClass: 'intro-lines-name_road' }
-                   );
-               }, 500);
 
-               function continueTo(nextStep) {
-                   context.on('exit.intro', null);
-                   nextStep();
-               }
-           }
+         function DOMHandler() {
+           this.cdata = false;
+         }
 
+         function position(locator, node) {
+           node.lineNumber = locator.lineNumber;
+           node.columnNumber = locator.columnNumber;
+         }
+         /**
+          * @see org.xml.sax.ContentHandler#startDocument
+          * @link http://www.saxproject.org/apidoc/org/xml/sax/ContentHandler.html
+          */
 
-           function didNameRoad() {
-               context.history().checkpoint('doneAddLine');
 
-               timeout(function() {
-                   reveal('.surface', helpString('intro.lines.did_name_road'), {
-                       buttonText: _t('intro.ok'),
-                       buttonCallback: function() { continueTo(updateLine); }
-                   });
-               }, 500);
+         DOMHandler.prototype = {
+           startDocument: function startDocument() {
+             this.doc = new DOMImplementation().createDocument(null, null, null);
 
-               function continueTo(nextStep) {
-                   nextStep();
-               }
-           }
+             if (this.locator) {
+               this.doc.documentURI = this.locator.systemId;
+             }
+           },
+           startElement: function startElement(namespaceURI, localName, qName, attrs) {
+             var doc = this.doc;
+             var el = doc.createElementNS(namespaceURI, qName || localName);
+             var len = attrs.length;
+             appendElement(this, el);
+             this.currentElement = el;
+             this.locator && position(this.locator, el);
 
+             for (var i = 0; i < len; i++) {
+               var namespaceURI = attrs.getURI(i);
+               var value = attrs.getValue(i);
+               var qName = attrs.getQName(i);
+               var attr = doc.createAttributeNS(namespaceURI, qName);
+               this.locator && position(attrs.getLocator(i), attr);
+               attr.value = attr.nodeValue = value;
+               el.setAttributeNode(attr);
+             }
+           },
+           endElement: function endElement(namespaceURI, localName, qName) {
+             var current = this.currentElement;
+             var tagName = current.tagName;
+             this.currentElement = current.parentNode;
+           },
+           startPrefixMapping: function startPrefixMapping(prefix, uri) {},
+           endPrefixMapping: function endPrefixMapping(prefix) {},
+           processingInstruction: function processingInstruction(target, data) {
+             var ins = this.doc.createProcessingInstruction(target, data);
+             this.locator && position(this.locator, ins);
+             appendElement(this, ins);
+           },
+           ignorableWhitespace: function ignorableWhitespace(ch, start, length) {},
+           characters: function characters(chars, start, length) {
+             chars = _toString.apply(this, arguments); //console.log(chars)
 
-           function updateLine() {
-               context.history().reset('doneAddLine');
-               if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
-                   return chapter.restart();
+             if (chars) {
+               if (this.cdata) {
+                 var charNode = this.doc.createCDATASection(chars);
+               } else {
+                 var charNode = this.doc.createTextNode(chars);
                }
 
-               var msec = transitionTime(woodRoadDragMidpoint, context.map().center());
-               if (msec) { reveal(null, null, { duration: 0 }); }
-               context.map().centerZoomEase(woodRoadDragMidpoint, 19, msec);
+               if (this.currentElement) {
+                 this.currentElement.appendChild(charNode);
+               } else if (/^\s*$/.test(chars)) {
+                 this.doc.appendChild(charNode); //process xml
+               }
 
-               timeout(function() {
-                   var padding = 250 * Math.pow(2, context.map().zoom() - 19);
-                   var box = pad(woodRoadDragMidpoint, padding, context);
-                   var advance = function() { continueTo(addNode); };
+               this.locator && position(this.locator, charNode);
+             }
+           },
+           skippedEntity: function skippedEntity(name) {},
+           endDocument: function endDocument() {
+             this.doc.normalize();
+           },
+           setDocumentLocator: function setDocumentLocator(locator) {
+             if (this.locator = locator) {
+               // && !('lineNumber' in locator)){
+               locator.lineNumber = 0;
+             }
+           },
+           //LexicalHandler
+           comment: function comment(chars, start, length) {
+             chars = _toString.apply(this, arguments);
+             var comm = this.doc.createComment(chars);
+             this.locator && position(this.locator, comm);
+             appendElement(this, comm);
+           },
+           startCDATA: function startCDATA() {
+             //used in characters() methods
+             this.cdata = true;
+           },
+           endCDATA: function endCDATA() {
+             this.cdata = false;
+           },
+           startDTD: function startDTD(name, publicId, systemId) {
+             var impl = this.doc.implementation;
 
-                   reveal(box, helpString('intro.lines.update_line'),
-                       { buttonText: _t('intro.ok'), buttonCallback: advance }
-                   );
+             if (impl && impl.createDocumentType) {
+               var dt = impl.createDocumentType(name, publicId, systemId);
+               this.locator && position(this.locator, dt);
+               appendElement(this, dt);
+             }
+           },
 
-                   context.map().on('move.intro drawn.intro', function() {
-                       var padding = 250 * Math.pow(2, context.map().zoom() - 19);
-                       var box = pad(woodRoadDragMidpoint, padding, context);
-                       reveal(box, helpString('intro.lines.update_line'),
-                           { duration: 0, buttonText: _t('intro.ok'), buttonCallback: advance }
-                       );
-                   });
-               }, msec + 100);
+           /**
+            * @see org.xml.sax.ErrorHandler
+            * @link http://www.saxproject.org/apidoc/org/xml/sax/ErrorHandler.html
+            */
+           warning: function warning(error) {
+             console.warn('[xmldom warning]\t' + error, _locator(this.locator));
+           },
+           error: function error(_error) {
+             console.error('[xmldom error]\t' + _error, _locator(this.locator));
+           },
+           fatalError: function fatalError(error) {
+             console.error('[xmldom fatalError]\t' + error, _locator(this.locator));
+             throw error;
+           }
+         };
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   nextStep();
-               }
+         function _locator(l) {
+           if (l) {
+             return '\n@' + (l.systemId || '') + '#[line:' + l.lineNumber + ',col:' + l.columnNumber + ']';
            }
+         }
 
+         function _toString(chars, start, length) {
+           if (typeof chars == 'string') {
+             return chars.substr(start, length);
+           } else {
+             //java sax connect width xmldom on rhino(what about: "? && !(chars instanceof String)")
+             if (chars.length >= start + length || start) {
+               return new java.lang.String(chars, start, length) + '';
+             }
 
-           function addNode() {
-               context.history().reset('doneAddLine');
-               if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
-                   return chapter.restart();
-               }
+             return chars;
+           }
+         }
+         /*
+          * @link http://www.saxproject.org/apidoc/org/xml/sax/ext/LexicalHandler.html
+          * used method of org.xml.sax.ext.LexicalHandler:
+          *  #comment(chars, start, length)
+          *  #startCDATA()
+          *  #endCDATA()
+          *  #startDTD(name, publicId, systemId)
+          *
+          *
+          * IGNORED method of org.xml.sax.ext.LexicalHandler:
+          *  #endDTD()
+          *  #startEntity(name)
+          *  #endEntity(name)
+          *
+          *
+          * @link http://www.saxproject.org/apidoc/org/xml/sax/ext/DeclHandler.html
+          * IGNORED method of org.xml.sax.ext.DeclHandler
+          *    #attributeDecl(eName, aName, type, mode, value)
+          *  #elementDecl(name, model)
+          *  #externalEntityDecl(name, publicId, systemId)
+          *  #internalEntityDecl(name, value)
+          * @link http://www.saxproject.org/apidoc/org/xml/sax/ext/EntityResolver2.html
+          * IGNORED method of org.xml.sax.EntityResolver2
+          *  #resolveEntity(String name,String publicId,String baseURI,String systemId)
+          *  #resolveEntity(publicId, systemId)
+          *  #getExternalSubset(name, baseURI)
+          * @link http://www.saxproject.org/apidoc/org/xml/sax/DTDHandler.html
+          * IGNORED method of org.xml.sax.DTDHandler
+          *  #notationDecl(name, publicId, systemId) {};
+          *  #unparsedEntityDecl(name, publicId, systemId, notationName) {};
+          */
 
-               var padding = 40 * Math.pow(2, context.map().zoom() - 19);
-               var box = pad(woodRoadAddNode, padding, context);
-               var addNodeString = helpString('intro.lines.add_node' + (context.lastPointerType() === 'mouse' ? '' : '_touch'));
-               reveal(box, addNodeString);
 
-               context.map().on('move.intro drawn.intro', function() {
-                   var padding = 40 * Math.pow(2, context.map().zoom() - 19);
-                   var box = pad(woodRoadAddNode, padding, context);
-                   reveal(box, addNodeString, { duration: 0 });
-               });
+         "endDTD,startEntity,endEntity,attributeDecl,elementDecl,externalEntityDecl,internalEntityDecl,resolveEntity,getExternalSubset,notationDecl,unparsedEntityDecl".replace(/\w+/g, function (key) {
+           DOMHandler.prototype[key] = function () {
+             return null;
+           };
+         });
+         /* Private static helpers treated below as private instance methods, so don't need to add these to the public API; we might use a Relator to also get rid of non-standard public properties */
 
-               context.history().on('change.intro', function(changed) {
-                   if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
-                       return continueTo(updateLine);
-                   }
-                   if (changed.created().length === 1) {
-                       timeout(function() { continueTo(startDragEndpoint); }, 500);
-                   }
-               });
+         function appendElement(hander, node) {
+           if (!hander.currentElement) {
+             hander.doc.appendChild(node);
+           } else {
+             hander.currentElement.appendChild(node);
+           }
+         } //appendChild and setAttributeNS are preformance key
+         //if(typeof require == 'function'){
 
-               context.on('enter.intro', function(mode) {
-                   if (mode.id !== 'select') {
-                       continueTo(updateLine);
-                   }
-               });
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.history().on('change.intro', null);
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
-           }
+         var XMLReader = sax.XMLReader;
+         var DOMImplementation = exports.DOMImplementation = dom.DOMImplementation;
+         exports.XMLSerializer = dom.XMLSerializer;
+         exports.DOMParser = DOMParser; //}
+       });
 
+       var togeojson = createCommonjsModule(function (module, exports) {
+         var toGeoJSON = function () {
 
-           function startDragEndpoint() {
-               if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
-                   return continueTo(updateLine);
-               }
-               var padding = 100 * Math.pow(2, context.map().zoom() - 19);
-               var box = pad(woodRoadDragEndpoint, padding, context);
-               var startDragString = helpString('intro.lines.start_drag_endpoint' + (context.lastPointerType() === 'mouse' ? '' : '_touch')) +
-                   helpString('intro.lines.drag_to_intersection');
-               reveal(box, startDragString);
+           var removeSpace = /\s*/g,
+               trimSpace = /^\s*|\s*$/g,
+               splitSpace = /\s+/; // generate a short, numeric hash of a string
 
-               context.map().on('move.intro drawn.intro', function() {
-                   if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
-                       return continueTo(updateLine);
-                   }
-                   var padding = 100 * Math.pow(2, context.map().zoom() - 19);
-                   var box = pad(woodRoadDragEndpoint, padding, context);
-                   reveal(box, startDragString, { duration: 0 });
+           function okhash(x) {
+             if (!x || !x.length) return 0;
 
-                   var entity = context.entity(woodRoadEndID);
-                   if (geoSphericalDistance(entity.loc, woodRoadDragEndpoint) <= 4) {
-                       continueTo(finishDragEndpoint);
-                   }
-               });
+             for (var i = 0, h = 0; i < x.length; i++) {
+               h = (h << 5) - h + x.charCodeAt(i) | 0;
+             }
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   nextStep();
-               }
-           }
+             return h;
+           } // all Y children of X
 
 
-           function finishDragEndpoint() {
-               if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
-                   return continueTo(updateLine);
-               }
+           function get(x, y) {
+             return x.getElementsByTagName(y);
+           }
 
-               var padding = 100 * Math.pow(2, context.map().zoom() - 19);
-               var box = pad(woodRoadDragEndpoint, padding, context);
-               var finishDragString = helpString('intro.lines.spot_looks_good') +
-                   helpString('intro.lines.finish_drag_endpoint' + (context.lastPointerType() === 'mouse' ? '' : '_touch'));
-               reveal(box, finishDragString);
+           function attr(x, y) {
+             return x.getAttribute(y);
+           }
 
-               context.map().on('move.intro drawn.intro', function() {
-                   if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
-                       return continueTo(updateLine);
-                   }
-                   var padding = 100 * Math.pow(2, context.map().zoom() - 19);
-                   var box = pad(woodRoadDragEndpoint, padding, context);
-                   reveal(box, finishDragString, { duration: 0 });
+           function attrf(x, y) {
+             return parseFloat(attr(x, y));
+           } // one Y child of X, if any, otherwise null
 
-                   var entity = context.entity(woodRoadEndID);
-                   if (geoSphericalDistance(entity.loc, woodRoadDragEndpoint) > 4) {
-                       continueTo(startDragEndpoint);
-                   }
-               });
 
-               context.on('enter.intro', function() {
-                   continueTo(startDragMidpoint);
-               });
+           function get1(x, y) {
+             var n = get(x, y);
+             return n.length ? n[0] : null;
+           } // https://developer.mozilla.org/en-US/docs/Web/API/Node.normalize
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
-           }
 
+           function norm(el) {
+             if (el.normalize) {
+               el.normalize();
+             }
 
-           function startDragMidpoint() {
-               if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
-                   return continueTo(updateLine);
-               }
-               if (context.selectedIDs().indexOf(woodRoadID) === -1) {
-                   context.enter(modeSelect(context, [woodRoadID]));
-               }
+             return el;
+           } // cast array x into numbers
 
-               var padding = 80 * Math.pow(2, context.map().zoom() - 19);
-               var box = pad(woodRoadDragMidpoint, padding, context);
-               reveal(box, helpString('intro.lines.start_drag_midpoint'));
 
-               context.map().on('move.intro drawn.intro', function() {
-                   if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
-                       return continueTo(updateLine);
-                   }
-                   var padding = 80 * Math.pow(2, context.map().zoom() - 19);
-                   var box = pad(woodRoadDragMidpoint, padding, context);
-                   reveal(box, helpString('intro.lines.start_drag_midpoint'), { duration: 0 });
-               });
+           function numarray(x) {
+             for (var j = 0, o = []; j < x.length; j++) {
+               o[j] = parseFloat(x[j]);
+             }
 
-               context.history().on('change.intro', function(changed) {
-                   if (changed.created().length === 1) {
-                       continueTo(continueDragMidpoint);
-                   }
-               });
+             return o;
+           } // get the content of a text node, if any
 
-               context.on('enter.intro', function(mode) {
-                   if (mode.id !== 'select') {
-                       // keep Wood Road selected so midpoint triangles are drawn..
-                       context.enter(modeSelect(context, [woodRoadID]));
-                   }
-               });
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.history().on('change.intro', null);
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
-           }
+           function nodeVal(x) {
+             if (x) {
+               norm(x);
+             }
 
+             return x && x.textContent || '';
+           } // get the contents of multiple text nodes, if present
 
-           function continueDragMidpoint() {
-               if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
-                   return continueTo(updateLine);
-               }
 
-               var padding = 100 * Math.pow(2, context.map().zoom() - 19);
-               var box = pad(woodRoadDragEndpoint, padding, context);
-               box.height += 400;
+           function getMulti(x, ys) {
+             var o = {},
+                 n,
+                 k;
 
-               var advance = function() {
-                   context.history().checkpoint('doneUpdateLine');
-                   continueTo(deleteLines);
-               };
+             for (k = 0; k < ys.length; k++) {
+               n = get1(x, ys[k]);
+               if (n) o[ys[k]] = nodeVal(n);
+             }
 
-               reveal(box, helpString('intro.lines.continue_drag_midpoint'),
-                   { buttonText: _t('intro.ok'), buttonCallback: advance }
-               );
+             return o;
+           } // add properties of Y to X, overwriting if present in both
 
-               context.map().on('move.intro drawn.intro', function() {
-                   if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
-                       return continueTo(updateLine);
-                   }
-                   var padding = 100 * Math.pow(2, context.map().zoom() - 19);
-                   var box = pad(woodRoadDragEndpoint, padding, context);
-                   box.height += 400;
-                   reveal(box, helpString('intro.lines.continue_drag_midpoint'),
-                       { duration: 0, buttonText: _t('intro.ok'), buttonCallback: advance }
-                   );
-               });
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   nextStep();
-               }
-           }
+           function extend(x, y) {
+             for (var k in y) {
+               x[k] = y[k];
+             }
+           } // get one coordinate from a coordinate array, if any
 
 
-           function deleteLines() {
-               context.history().reset('doneUpdateLine');
-               context.enter(modeBrowse(context));
+           function coord1(v) {
+             return numarray(v.replace(removeSpace, '').split(','));
+           } // get all coordinates from a coordinate array as [[],[]]
 
-               if (!context.hasEntity(washingtonStreetID) ||
-                   !context.hasEntity(twelfthAvenueID) ||
-                   !context.hasEntity(eleventhAvenueEndID)) {
-                   return chapter.restart();
-               }
-
-               var msec = transitionTime(deleteLinesLoc, context.map().center());
-               if (msec) { reveal(null, null, { duration: 0 }); }
-               context.map().centerZoomEase(deleteLinesLoc, 18, msec);
-
-               timeout(function() {
-                   var padding = 200 * Math.pow(2, context.map().zoom() - 18);
-                   var box = pad(deleteLinesLoc, padding, context);
-                   box.top -= 200;
-                   box.height += 400;
-                   var advance = function() { continueTo(rightClickIntersection); };
-
-                   reveal(box, helpString('intro.lines.delete_lines', { street: _t('intro.graph.name.12th-avenue') }),
-                       { buttonText: _t('intro.ok'), buttonCallback: advance }
-                   );
-
-                   context.map().on('move.intro drawn.intro', function() {
-                       var padding = 200 * Math.pow(2, context.map().zoom() - 18);
-                       var box = pad(deleteLinesLoc, padding, context);
-                       box.top -= 200;
-                       box.height += 400;
-                       reveal(box, helpString('intro.lines.delete_lines', { street: _t('intro.graph.name.12th-avenue') }),
-                           { duration: 0, buttonText: _t('intro.ok'), buttonCallback: advance }
-                       );
-                   });
 
-                   context.history().on('change.intro', function() {
-                       timeout(function() {
-                           continueTo(deleteLines);
-                       }, 500);  // after any transition (e.g. if user deleted intersection)
-                   });
+           function coord(v) {
+             var coords = v.replace(trimSpace, '').split(splitSpace),
+                 o = [];
 
-               }, msec + 100);
+             for (var i = 0; i < coords.length; i++) {
+               o.push(coord1(coords[i]));
+             }
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
-               }
+             return o;
            }
 
+           function coordPair(x) {
+             var ll = [attrf(x, 'lon'), attrf(x, 'lat')],
+                 ele = get1(x, 'ele'),
+                 // handle namespaced attribute in browser
+             heartRate = get1(x, 'gpxtpx:hr') || get1(x, 'hr'),
+                 time = get1(x, 'time'),
+                 e;
 
-           function rightClickIntersection() {
-               context.history().reset('doneUpdateLine');
-               context.enter(modeBrowse(context));
-
-               context.map().centerZoomEase(eleventhAvenueEnd, 18, 500);
+             if (ele) {
+               e = parseFloat(nodeVal(ele));
 
-               var rightClickString = helpString('intro.lines.split_street', {
-                       street1: _t('intro.graph.name.11th-avenue'),
-                       street2: _t('intro.graph.name.washington-street')
-                   }) +
-                   helpString('intro.lines.' + (context.lastPointerType() === 'mouse' ? 'rightclick_intersection' : 'edit_menu_intersection_touch'));
+               if (!isNaN(e)) {
+                 ll.push(e);
+               }
+             }
 
-               timeout(function() {
-                   var padding = 60 * Math.pow(2, context.map().zoom() - 18);
-                   var box = pad(eleventhAvenueEnd, padding, context);
-                   reveal(box, rightClickString);
+             return {
+               coordinates: ll,
+               time: time ? nodeVal(time) : null,
+               heartRate: heartRate ? parseFloat(nodeVal(heartRate)) : null
+             };
+           } // create a new feature collection parent object
 
-                   context.map().on('move.intro drawn.intro', function() {
-                       var padding = 60 * Math.pow(2, context.map().zoom() - 18);
-                       var box = pad(eleventhAvenueEnd, padding, context);
-                       reveal(box, rightClickString,
-                           { duration: 0 }
-                       );
-                   });
 
-                   context.on('enter.intro', function(mode) {
-                       if (mode.id !== 'select') return;
-                       var ids = context.selectedIDs();
-                       if (ids.length !== 1 || ids[0] !== eleventhAvenueEndID) return;
+           function fc() {
+             return {
+               type: 'FeatureCollection',
+               features: []
+             };
+           }
 
-                       timeout(function() {
-                           var node = selectMenuItem(context, 'split').node();
-                           if (!node) return;
-                           continueTo(splitIntersection);
-                       }, 50);  // after menu visible
-                   });
+           var serializer;
 
-                   context.history().on('change.intro', function() {
-                       timeout(function() {
-                           continueTo(deleteLines);
-                       }, 300);  // after any transition (e.g. if user deleted intersection)
-                   });
+           if (typeof XMLSerializer !== 'undefined') {
+             /* istanbul ignore next */
+             serializer = new XMLSerializer(); // only require xmldom in a node environment
+           } else if ( (typeof process === "undefined" ? "undefined" : _typeof(process)) === 'object' && !process.browser) {
+             serializer = new domParser.XMLSerializer();
+           }
 
-               }, 600);
+           function xml2str(str) {
+             // IE9 will create a new XMLSerializer but it'll crash immediately.
+             // This line is ignored because we don't run coverage tests in IE9
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.on('enter.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
-               }
+             /* istanbul ignore next */
+             if (str.xml !== undefined) return str.xml;
+             return serializer.serializeToString(str);
            }
 
+           var t = {
+             kml: function kml(doc) {
+               var gj = fc(),
+                   // styleindex keeps track of hashed styles in order to match features
+               styleIndex = {},
+                   styleByHash = {},
+                   // stylemapindex keeps track of style maps to expose in properties
+               styleMapIndex = {},
+                   // atomic geospatial types supported by KML - MultiGeometry is
+               // handled separately
+               geotypes = ['Polygon', 'LineString', 'Point', 'Track', 'gx:Track'],
+                   // all root placemarks in the file
+               placemarks = get(doc, 'Placemark'),
+                   styles = get(doc, 'Style'),
+                   styleMaps = get(doc, 'StyleMap');
+
+               for (var k = 0; k < styles.length; k++) {
+                 var hash = okhash(xml2str(styles[k])).toString(16);
+                 styleIndex['#' + attr(styles[k], 'id')] = hash;
+                 styleByHash[hash] = styles[k];
+               }
+
+               for (var l = 0; l < styleMaps.length; l++) {
+                 styleIndex['#' + attr(styleMaps[l], 'id')] = okhash(xml2str(styleMaps[l])).toString(16);
+                 var pairs = get(styleMaps[l], 'Pair');
+                 var pairsMap = {};
+
+                 for (var m = 0; m < pairs.length; m++) {
+                   pairsMap[nodeVal(get1(pairs[m], 'key'))] = nodeVal(get1(pairs[m], 'styleUrl'));
+                 }
 
-           function splitIntersection() {
-               if (!context.hasEntity(washingtonStreetID) ||
-                   !context.hasEntity(twelfthAvenueID) ||
-                   !context.hasEntity(eleventhAvenueEndID)) {
-                   return continueTo(deleteLines);
+                 styleMapIndex['#' + attr(styleMaps[l], 'id')] = pairsMap;
                }
 
-               var node = selectMenuItem(context, 'split').node();
-               if (!node) { return continueTo(rightClickIntersection); }
+               for (var j = 0; j < placemarks.length; j++) {
+                 gj.features = gj.features.concat(getPlacemark(placemarks[j]));
+               }
 
-               var wasChanged = false;
-               _washingtonSegmentID = null;
+               function kmlColor(v) {
+                 var color, opacity;
+                 v = v || '';
 
-               reveal('.edit-menu', helpString('intro.lines.split_intersection',
-                   { street: _t('intro.graph.name.washington-street') }),
-                   { padding: 50 }
-               );
+                 if (v.substr(0, 1) === '#') {
+                   v = v.substr(1);
+                 }
 
-               context.map().on('move.intro drawn.intro', function() {
-                   var node = selectMenuItem(context, 'split').node();
-                   if (!wasChanged && !node) { return continueTo(rightClickIntersection); }
+                 if (v.length === 6 || v.length === 3) {
+                   color = v;
+                 }
 
-                   reveal('.edit-menu', helpString('intro.lines.split_intersection',
-                       { street: _t('intro.graph.name.washington-street') }),
-                       { duration: 0, padding: 50 }
-                   );
-               });
+                 if (v.length === 8) {
+                   opacity = parseInt(v.substr(0, 2), 16) / 255;
+                   color = '#' + v.substr(6, 2) + v.substr(4, 2) + v.substr(2, 2);
+                 }
 
-               context.history().on('change.intro', function(changed) {
-                   wasChanged = true;
-                   timeout(function() {
-                       if (context.history().undoAnnotation() === _t('operations.split.annotation.line')) {
-                           _washingtonSegmentID = changed.created()[0].id;
-                           continueTo(didSplit);
-                       } else {
-                           _washingtonSegmentID = null;
-                           continueTo(retrySplit);
-                       }
-                   }, 300);  // after any transition (e.g. if user deleted intersection)
-               });
+                 return [color, isNaN(opacity) ? undefined : opacity];
+               }
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
+               function gxCoord(v) {
+                 return numarray(v.split(' '));
                }
-           }
 
+               function gxCoords(root) {
+                 var elems = get(root, 'coord'),
+                     coords = [],
+                     times = [];
+                 if (elems.length === 0) elems = get(root, 'gx:coord');
 
-           function retrySplit() {
-               context.enter(modeBrowse(context));
-               context.map().centerZoomEase(eleventhAvenueEnd, 18, 500);
-               var advance = function() { continueTo(rightClickIntersection); };
+                 for (var i = 0; i < elems.length; i++) {
+                   coords.push(gxCoord(nodeVal(elems[i])));
+                 }
 
-               var padding = 60 * Math.pow(2, context.map().zoom() - 18);
-               var box = pad(eleventhAvenueEnd, padding, context);
-               reveal(box, helpString('intro.lines.retry_split'),
-                   { buttonText: _t('intro.ok'), buttonCallback: advance }
-               );
+                 var timeElems = get(root, 'when');
 
-               context.map().on('move.intro drawn.intro', function() {
-                   var padding = 60 * Math.pow(2, context.map().zoom() - 18);
-                   var box = pad(eleventhAvenueEnd, padding, context);
-                   reveal(box, helpString('intro.lines.retry_split'),
-                       { duration: 0, buttonText: _t('intro.ok'), buttonCallback: advance }
-                   );
-               });
+                 for (var j = 0; j < timeElems.length; j++) {
+                   times.push(nodeVal(timeElems[j]));
+                 }
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   nextStep();
+                 return {
+                   coords: coords,
+                   times: times
+                 };
                }
-           }
 
+               function getGeometry(root) {
+                 var geomNode,
+                     geomNodes,
+                     i,
+                     j,
+                     k,
+                     geoms = [],
+                     coordTimes = [];
 
-           function didSplit() {
-               if (!_washingtonSegmentID ||
-                   !context.hasEntity(_washingtonSegmentID) ||
-                   !context.hasEntity(washingtonStreetID) ||
-                   !context.hasEntity(twelfthAvenueID) ||
-                   !context.hasEntity(eleventhAvenueEndID)) {
-                   return continueTo(rightClickIntersection);
-               }
-
-               var ids = context.selectedIDs();
-               var string = 'intro.lines.did_split_' + (ids.length > 1 ? 'multi' : 'single');
-               var street = _t('intro.graph.name.washington-street');
+                 if (get1(root, 'MultiGeometry')) {
+                   return getGeometry(get1(root, 'MultiGeometry'));
+                 }
 
-               var padding = 200 * Math.pow(2, context.map().zoom() - 18);
-               var box = pad(twelfthAvenue, padding, context);
-               box.width = box.width / 2;
-               reveal(box, helpString(string, { street1: street, street2: street }),
-                   { duration: 500 }
-               );
+                 if (get1(root, 'MultiTrack')) {
+                   return getGeometry(get1(root, 'MultiTrack'));
+                 }
 
-               timeout(function() {
-                   context.map().centerZoomEase(twelfthAvenue, 18, 500);
+                 if (get1(root, 'gx:MultiTrack')) {
+                   return getGeometry(get1(root, 'gx:MultiTrack'));
+                 }
 
-                   context.map().on('move.intro drawn.intro', function() {
-                       var padding = 200 * Math.pow(2, context.map().zoom() - 18);
-                       var box = pad(twelfthAvenue, padding, context);
-                       box.width = box.width / 2;
-                       reveal(box, helpString(string, { street1: street, street2: street }),
-                           { duration: 0 }
-                       );
-                   });
-               }, 600);  // after initial reveal and curtain cut
+                 for (i = 0; i < geotypes.length; i++) {
+                   geomNodes = get(root, geotypes[i]);
 
-               context.on('enter.intro', function() {
-                   var ids = context.selectedIDs();
-                   if (ids.length === 1 && ids[0] === _washingtonSegmentID) {
-                       continueTo(multiSelect);
-                   }
-               });
+                   if (geomNodes) {
+                     for (j = 0; j < geomNodes.length; j++) {
+                       geomNode = geomNodes[j];
 
-               context.history().on('change.intro', function() {
-                   if (!_washingtonSegmentID ||
-                       !context.hasEntity(_washingtonSegmentID) ||
-                       !context.hasEntity(washingtonStreetID) ||
-                       !context.hasEntity(twelfthAvenueID) ||
-                       !context.hasEntity(eleventhAvenueEndID)) {
-                       return continueTo(rightClickIntersection);
-                   }
-               });
+                       if (geotypes[i] === 'Point') {
+                         geoms.push({
+                           type: 'Point',
+                           coordinates: coord1(nodeVal(get1(geomNode, 'coordinates')))
+                         });
+                       } else if (geotypes[i] === 'LineString') {
+                         geoms.push({
+                           type: 'LineString',
+                           coordinates: coord(nodeVal(get1(geomNode, 'coordinates')))
+                         });
+                       } else if (geotypes[i] === 'Polygon') {
+                         var rings = get(geomNode, 'LinearRing'),
+                             coords = [];
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.on('enter.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
-               }
-           }
+                         for (k = 0; k < rings.length; k++) {
+                           coords.push(coord(nodeVal(get1(rings[k], 'coordinates'))));
+                         }
 
+                         geoms.push({
+                           type: 'Polygon',
+                           coordinates: coords
+                         });
+                       } else if (geotypes[i] === 'Track' || geotypes[i] === 'gx:Track') {
+                         var track = gxCoords(geomNode);
+                         geoms.push({
+                           type: 'LineString',
+                           coordinates: track.coords
+                         });
+                         if (track.times.length) coordTimes.push(track.times);
+                       }
+                     }
+                   }
+                 }
 
-           function multiSelect() {
-               if (!_washingtonSegmentID ||
-                   !context.hasEntity(_washingtonSegmentID) ||
-                   !context.hasEntity(washingtonStreetID) ||
-                   !context.hasEntity(twelfthAvenueID) ||
-                   !context.hasEntity(eleventhAvenueEndID)) {
-                   return continueTo(rightClickIntersection);
+                 return {
+                   geoms: geoms,
+                   coordTimes: coordTimes
+                 };
                }
 
-               var ids = context.selectedIDs();
-               var hasWashington = ids.indexOf(_washingtonSegmentID) !== -1;
-               var hasTwelfth = ids.indexOf(twelfthAvenueID) !== -1;
+               function getPlacemark(root) {
+                 var geomsAndTimes = getGeometry(root),
+                     i,
+                     properties = {},
+                     name = nodeVal(get1(root, 'name')),
+                     address = nodeVal(get1(root, 'address')),
+                     styleUrl = nodeVal(get1(root, 'styleUrl')),
+                     description = nodeVal(get1(root, 'description')),
+                     timeSpan = get1(root, 'TimeSpan'),
+                     timeStamp = get1(root, 'TimeStamp'),
+                     extendedData = get1(root, 'ExtendedData'),
+                     lineStyle = get1(root, 'LineStyle'),
+                     polyStyle = get1(root, 'PolyStyle'),
+                     visibility = get1(root, 'visibility');
+                 if (!geomsAndTimes.geoms.length) return [];
+                 if (name) properties.name = name;
+                 if (address) properties.address = address;
 
-               if (hasWashington && hasTwelfth) {
-                   return continueTo(multiRightClick);
-               } else if (!hasWashington && !hasTwelfth) {
-                   return continueTo(didSplit);
-               }
+                 if (styleUrl) {
+                   if (styleUrl[0] !== '#') {
+                     styleUrl = '#' + styleUrl;
+                   }
 
-               context.map().centerZoomEase(twelfthAvenue, 18, 500);
+                   properties.styleUrl = styleUrl;
 
-               timeout(function() {
-                   var selected, other, padding, box;
-                   if (hasWashington) {
-                       selected = _t('intro.graph.name.washington-street');
-                       other = _t('intro.graph.name.12th-avenue');
-                       padding = 60 * Math.pow(2, context.map().zoom() - 18);
-                       box = pad(twelfthAvenueEnd, padding, context);
-                       box.width *= 3;
-                   } else {
-                       selected = _t('intro.graph.name.12th-avenue');
-                       other = _t('intro.graph.name.washington-street');
-                       padding = 200 * Math.pow(2, context.map().zoom() - 18);
-                       box = pad(twelfthAvenue, padding, context);
-                       box.width /= 2;
+                   if (styleIndex[styleUrl]) {
+                     properties.styleHash = styleIndex[styleUrl];
                    }
 
-                   reveal(box,
-                       helpString('intro.lines.multi_select',
-                           { selected: selected, other1: other }) + ' ' +
-                       helpString('intro.lines.add_to_selection_' + (context.lastPointerType() === 'mouse' ? 'click' : 'touch'),
-                           { selected: selected, other2: other })
-                   );
-
-                   context.map().on('move.intro drawn.intro', function() {
-                       if (hasWashington) {
-                           selected = _t('intro.graph.name.washington-street');
-                           other = _t('intro.graph.name.12th-avenue');
-                           padding = 60 * Math.pow(2, context.map().zoom() - 18);
-                           box = pad(twelfthAvenueEnd, padding, context);
-                           box.width *= 3;
-                       } else {
-                           selected = _t('intro.graph.name.12th-avenue');
-                           other = _t('intro.graph.name.washington-street');
-                           padding = 200 * Math.pow(2, context.map().zoom() - 18);
-                           box = pad(twelfthAvenue, padding, context);
-                           box.width /= 2;
-                       }
+                   if (styleMapIndex[styleUrl]) {
+                     properties.styleMapHash = styleMapIndex[styleUrl];
+                     properties.styleHash = styleIndex[styleMapIndex[styleUrl].normal];
+                   } // Try to populate the lineStyle or polyStyle since we got the style hash
 
-                       reveal(box,
-                           helpString('intro.lines.multi_select',
-                               { selected: selected, other1: other }) + ' ' +
-                           helpString('intro.lines.add_to_selection_' + (context.lastPointerType() === 'mouse' ? 'click' : 'touch'),
-                               { selected: selected, other2: other }),
-                           { duration: 0 }
-                       );
-                   });
 
-                   context.on('enter.intro', function() {
-                       continueTo(multiSelect);
-                   });
+                   var style = styleByHash[properties.styleHash];
 
-                   context.history().on('change.intro', function() {
-                       if (!_washingtonSegmentID ||
-                           !context.hasEntity(_washingtonSegmentID) ||
-                           !context.hasEntity(washingtonStreetID) ||
-                           !context.hasEntity(twelfthAvenueID) ||
-                           !context.hasEntity(eleventhAvenueEndID)) {
-                           return continueTo(rightClickIntersection);
-                       }
-                   });
-               }, 600);
+                   if (style) {
+                     if (!lineStyle) lineStyle = get1(style, 'LineStyle');
+                     if (!polyStyle) polyStyle = get1(style, 'PolyStyle');
+                   }
+                 }
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.on('enter.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
-               }
-           }
+                 if (description) properties.description = description;
 
+                 if (timeSpan) {
+                   var begin = nodeVal(get1(timeSpan, 'begin'));
+                   var end = nodeVal(get1(timeSpan, 'end'));
+                   properties.timespan = {
+                     begin: begin,
+                     end: end
+                   };
+                 }
 
-           function multiRightClick() {
-               if (!_washingtonSegmentID ||
-                   !context.hasEntity(_washingtonSegmentID) ||
-                   !context.hasEntity(washingtonStreetID) ||
-                   !context.hasEntity(twelfthAvenueID) ||
-                   !context.hasEntity(eleventhAvenueEndID)) {
-                   return continueTo(rightClickIntersection);
-               }
+                 if (timeStamp) {
+                   properties.timestamp = nodeVal(get1(timeStamp, 'when'));
+                 }
 
-               var padding = 200 * Math.pow(2, context.map().zoom() - 18);
-               var box = pad(twelfthAvenue, padding, context);
+                 if (lineStyle) {
+                   var linestyles = kmlColor(nodeVal(get1(lineStyle, 'color'))),
+                       color = linestyles[0],
+                       opacity = linestyles[1],
+                       width = parseFloat(nodeVal(get1(lineStyle, 'width')));
+                   if (color) properties.stroke = color;
+                   if (!isNaN(opacity)) properties['stroke-opacity'] = opacity;
+                   if (!isNaN(width)) properties['stroke-width'] = width;
+                 }
 
-               var rightClickString = helpString('intro.lines.multi_select_success') +
-                   helpString('intro.lines.multi_' + (context.lastPointerType() === 'mouse' ? 'rightclick' : 'edit_menu_touch'));
-               reveal(box, rightClickString);
+                 if (polyStyle) {
+                   var polystyles = kmlColor(nodeVal(get1(polyStyle, 'color'))),
+                       pcolor = polystyles[0],
+                       popacity = polystyles[1],
+                       fill = nodeVal(get1(polyStyle, 'fill')),
+                       outline = nodeVal(get1(polyStyle, 'outline'));
+                   if (pcolor) properties.fill = pcolor;
+                   if (!isNaN(popacity)) properties['fill-opacity'] = popacity;
+                   if (fill) properties['fill-opacity'] = fill === '1' ? properties['fill-opacity'] || 1 : 0;
+                   if (outline) properties['stroke-opacity'] = outline === '1' ? properties['stroke-opacity'] || 1 : 0;
+                 }
 
-               context.map().on('move.intro drawn.intro', function() {
-                   var padding = 200 * Math.pow(2, context.map().zoom() - 18);
-                   var box = pad(twelfthAvenue, padding, context);
-                   reveal(box, rightClickString, { duration: 0 });
-               });
+                 if (extendedData) {
+                   var datas = get(extendedData, 'Data'),
+                       simpleDatas = get(extendedData, 'SimpleData');
 
-               context.ui().editMenu().on('toggled.intro', function(open) {
-                   if (!open) return;
-
-                   timeout(function() {
-                       var ids = context.selectedIDs();
-                       if (ids.length === 2 &&
-                           ids.indexOf(twelfthAvenueID) !== -1 &&
-                           ids.indexOf(_washingtonSegmentID) !== -1) {
-                               var node = selectMenuItem(context, 'delete').node();
-                               if (!node) return;
-                               continueTo(multiDelete);
-                       } else if (ids.length === 1 &&
-                           ids.indexOf(_washingtonSegmentID) !== -1) {
-                           return continueTo(multiSelect);
-                       } else {
-                           return continueTo(didSplit);
-                       }
-                   }, 300);  // after edit menu visible
-               });
+                   for (i = 0; i < datas.length; i++) {
+                     properties[datas[i].getAttribute('name')] = nodeVal(get1(datas[i], 'value'));
+                   }
 
-               context.history().on('change.intro', function() {
-                   if (!_washingtonSegmentID ||
-                       !context.hasEntity(_washingtonSegmentID) ||
-                       !context.hasEntity(washingtonStreetID) ||
-                       !context.hasEntity(twelfthAvenueID) ||
-                       !context.hasEntity(eleventhAvenueEndID)) {
-                       return continueTo(rightClickIntersection);
+                   for (i = 0; i < simpleDatas.length; i++) {
+                     properties[simpleDatas[i].getAttribute('name')] = nodeVal(simpleDatas[i]);
                    }
-               });
+                 }
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.ui().editMenu().on('toggled.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
-               }
-           }
+                 if (visibility) {
+                   properties.visibility = nodeVal(visibility);
+                 }
 
+                 if (geomsAndTimes.coordTimes.length) {
+                   properties.coordTimes = geomsAndTimes.coordTimes.length === 1 ? geomsAndTimes.coordTimes[0] : geomsAndTimes.coordTimes;
+                 }
 
-           function multiDelete() {
-               if (!_washingtonSegmentID ||
-                   !context.hasEntity(_washingtonSegmentID) ||
-                   !context.hasEntity(washingtonStreetID) ||
-                   !context.hasEntity(twelfthAvenueID) ||
-                   !context.hasEntity(eleventhAvenueEndID)) {
-                   return continueTo(rightClickIntersection);
+                 var feature = {
+                   type: 'Feature',
+                   geometry: geomsAndTimes.geoms.length === 1 ? geomsAndTimes.geoms[0] : {
+                     type: 'GeometryCollection',
+                     geometries: geomsAndTimes.geoms
+                   },
+                   properties: properties
+                 };
+                 if (attr(root, 'id')) feature.id = attr(root, 'id');
+                 return [feature];
                }
 
-               var node = selectMenuItem(context, 'delete').node();
-               if (!node) return continueTo(multiRightClick);
+               return gj;
+             },
+             gpx: function gpx(doc) {
+               var i,
+                   tracks = get(doc, 'trk'),
+                   routes = get(doc, 'rte'),
+                   waypoints = get(doc, 'wpt'),
+                   // a feature collection
+               gj = fc(),
+                   feature;
+
+               for (i = 0; i < tracks.length; i++) {
+                 feature = getTrack(tracks[i]);
+                 if (feature) gj.features.push(feature);
+               }
+
+               for (i = 0; i < routes.length; i++) {
+                 feature = getRoute(routes[i]);
+                 if (feature) gj.features.push(feature);
+               }
+
+               for (i = 0; i < waypoints.length; i++) {
+                 gj.features.push(getPoint(waypoints[i]));
+               }
+
+               function getPoints(node, pointname) {
+                 var pts = get(node, pointname),
+                     line = [],
+                     times = [],
+                     heartRates = [],
+                     l = pts.length;
+                 if (l < 2) return {}; // Invalid line in GeoJSON
+
+                 for (var i = 0; i < l; i++) {
+                   var c = coordPair(pts[i]);
+                   line.push(c.coordinates);
+                   if (c.time) times.push(c.time);
+                   if (c.heartRate) heartRates.push(c.heartRate);
+                 }
 
-               reveal('.edit-menu',
-                   helpString('intro.lines.multi_delete'),
-                   { padding: 50 }
-               );
+                 return {
+                   line: line,
+                   times: times,
+                   heartRates: heartRates
+                 };
+               }
 
-               context.map().on('move.intro drawn.intro', function() {
-                   reveal('.edit-menu',
-                       helpString('intro.lines.multi_delete'),
-                       { duration: 0, padding: 50 }
-                   );
-               });
+               function getTrack(node) {
+                 var segments = get(node, 'trkseg'),
+                     track = [],
+                     times = [],
+                     heartRates = [],
+                     line;
 
-               context.on('exit.intro', function() {
-                   if (context.hasEntity(_washingtonSegmentID) || context.hasEntity(twelfthAvenueID)) {
-                       return continueTo(multiSelect);  // left select mode but roads still exist
-                   }
-               });
+                 for (var i = 0; i < segments.length; i++) {
+                   line = getPoints(segments[i], 'trkpt');
 
-               context.history().on('change.intro', function() {
-                   if (context.hasEntity(_washingtonSegmentID) || context.hasEntity(twelfthAvenueID)) {
-                       continueTo(retryDelete);         // changed something but roads still exist
-                   } else {
-                       continueTo(play);
+                   if (line) {
+                     if (line.line) track.push(line.line);
+                     if (line.times && line.times.length) times.push(line.times);
+                     if (line.heartRates && line.heartRates.length) heartRates.push(line.heartRates);
                    }
-               });
+                 }
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.on('exit.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
+                 if (track.length === 0) return;
+                 var properties = getProperties(node);
+                 extend(properties, getLineStyle(get1(node, 'extensions')));
+                 if (times.length) properties.coordTimes = track.length === 1 ? times[0] : times;
+                 if (heartRates.length) properties.heartRates = track.length === 1 ? heartRates[0] : heartRates;
+                 return {
+                   type: 'Feature',
+                   properties: properties,
+                   geometry: {
+                     type: track.length === 1 ? 'LineString' : 'MultiLineString',
+                     coordinates: track.length === 1 ? track[0] : track
+                   }
+                 };
                }
-           }
 
+               function getRoute(node) {
+                 var line = getPoints(node, 'rtept');
+                 if (!line.line) return;
+                 var prop = getProperties(node);
+                 extend(prop, getLineStyle(get1(node, 'extensions')));
+                 var routeObj = {
+                   type: 'Feature',
+                   properties: prop,
+                   geometry: {
+                     type: 'LineString',
+                     coordinates: line.line
+                   }
+                 };
+                 return routeObj;
+               }
 
-           function retryDelete() {
-               context.enter(modeBrowse(context));
+               function getPoint(node) {
+                 var prop = getProperties(node);
+                 extend(prop, getMulti(node, ['sym']));
+                 return {
+                   type: 'Feature',
+                   properties: prop,
+                   geometry: {
+                     type: 'Point',
+                     coordinates: coordPair(node).coordinates
+                   }
+                 };
+               }
 
-               var padding = 200 * Math.pow(2, context.map().zoom() - 18);
-               var box = pad(twelfthAvenue, padding, context);
-               reveal(box, helpString('intro.lines.retry_delete'), {
-                   buttonText: _t('intro.ok'),
-                   buttonCallback: function() { continueTo(multiSelect); }
-               });
+               function getLineStyle(extensions) {
+                 var style = {};
 
-               function continueTo(nextStep) {
-                   nextStep();
-               }
-           }
+                 if (extensions) {
+                   var lineStyle = get1(extensions, 'line');
 
+                   if (lineStyle) {
+                     var color = nodeVal(get1(lineStyle, 'color')),
+                         opacity = parseFloat(nodeVal(get1(lineStyle, 'opacity'))),
+                         width = parseFloat(nodeVal(get1(lineStyle, 'width')));
+                     if (color) style.stroke = color;
+                     if (!isNaN(opacity)) style['stroke-opacity'] = opacity; // GPX width is in mm, convert to px with 96 px per inch
 
-           function play() {
-               dispatch$1.call('done');
-               reveal('.ideditor',
-                   helpString('intro.lines.play', { next: _t('intro.buildings.title') }), {
-                       tooltipBox: '.intro-nav-wrap .chapter-building',
-                       buttonText: _t('intro.ok'),
-                       buttonCallback: function() { reveal('.ideditor'); }
+                     if (!isNaN(width)) style['stroke-width'] = width * 96 / 25.4;
                    }
-               );
-          }
-
+                 }
 
-           chapter.enter = function() {
-               addLine();
-           };
+                 return style;
+               }
 
+               function getProperties(node) {
+                 var prop = getMulti(node, ['name', 'cmt', 'desc', 'type', 'time', 'keywords']),
+                     links = get(node, 'link');
+                 if (links.length) prop.links = [];
 
-           chapter.exit = function() {
-               timeouts.forEach(window.clearTimeout);
-               select(window).on('pointerdown.intro mousedown.intro', null, true);
-               context.on('enter.intro exit.intro', null);
-               context.map().on('move.intro drawn.intro', null);
-               context.history().on('change.intro', null);
-               context.container().select('.inspector-wrap').on('wheel.intro', null);
-               context.container().select('.preset-list-button').on('click.intro', null);
-           };
+                 for (var i = 0, link; i < links.length; i++) {
+                   link = {
+                     href: attr(links[i], 'href')
+                   };
+                   extend(link, getMulti(links[i], ['text', 'type']));
+                   prop.links.push(link);
+                 }
 
+                 return prop;
+               }
 
-           chapter.restart = function() {
-               chapter.exit();
-               chapter.enter();
+               return gj;
+             }
            };
+           return t;
+         }();
 
+         module.exports = toGeoJSON;
+       });
 
-           return utilRebind(chapter, dispatch$1, 'on');
-       }
+       var _initialized = false;
+       var _enabled = false;
 
-       function uiIntroBuilding(context, reveal) {
-           var dispatch$1 = dispatch('done');
-           var house = [-85.62815, 41.95638];
-           var tank = [-85.62732, 41.95347];
-           var buildingCatetory = _mainPresetIndex.item('category-building');
-           var housePreset = _mainPresetIndex.item('building/house');
-           var tankPreset = _mainPresetIndex.item('man_made/storage_tank');
-           var timeouts = [];
-           var _houseID = null;
-           var _tankID = null;
-
-
-           var chapter = {
-               title: 'intro.buildings.title'
-           };
+       var _geojson;
 
+       function svgData(projection, context, dispatch) {
+         var throttledRedraw = throttle(function () {
+           dispatch.call('change');
+         }, 1000);
 
-           function timeout(f, t) {
-               timeouts.push(window.setTimeout(f, t));
-           }
+         var _showLabels = true;
+         var detected = utilDetect();
+         var layer = select(null);
 
+         var _vtService;
 
-           function eventCancel() {
-               event.stopPropagation();
-               event.preventDefault();
-           }
+         var _fileList;
 
+         var _template;
 
-           function revealHouse(center, text, options) {
-               var padding = 160 * Math.pow(2, context.map().zoom() - 20);
-               var box = pad(center, padding, context);
-               reveal(box, text, options);
-           }
+         var _src;
+
+         function init() {
+           if (_initialized) return; // run once
 
+           _geojson = {};
+           _enabled = true;
 
-           function revealTank(center, text, options) {
-               var padding = 190 * Math.pow(2, context.map().zoom() - 19.5);
-               var box = pad(center, padding, context);
-               reveal(box, text, options);
+           function over(d3_event) {
+             d3_event.stopPropagation();
+             d3_event.preventDefault();
+             d3_event.dataTransfer.dropEffect = 'copy';
            }
 
+           context.container().attr('dropzone', 'copy').on('drop.svgData', function (d3_event) {
+             d3_event.stopPropagation();
+             d3_event.preventDefault();
+             if (!detected.filedrop) return;
+             drawData.fileList(d3_event.dataTransfer.files);
+           }).on('dragenter.svgData', over).on('dragexit.svgData', over).on('dragover.svgData', over);
+           _initialized = true;
+         }
 
-           function addHouse() {
-               context.enter(modeBrowse(context));
-               context.history().reset('initial');
-               _houseID = null;
-
-               var msec = transitionTime(house, context.map().center());
-               if (msec) { reveal(null, null, { duration: 0 }); }
-               context.map().centerZoomEase(house, 19, msec);
-
-               timeout(function() {
-                   var tooltip = reveal('button.add-area',
-                       helpString('intro.buildings.add_building'));
-
-                   tooltip.selectAll('.popover-inner')
-                       .insert('svg', 'span')
-                       .attr('class', 'tooltip-illustration')
-                       .append('use')
-                       .attr('xlink:href', '#iD-graphic-buildings');
-
-                   context.on('enter.intro', function(mode) {
-                       if (mode.id !== 'add-area') return;
-                       continueTo(startHouse);
-                   });
-               }, msec + 100);
+         function getService() {
+           if (services.vectorTile && !_vtService) {
+             _vtService = services.vectorTile;
 
-               function continueTo(nextStep) {
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
+             _vtService.event.on('loadedData', throttledRedraw);
+           } else if (!services.vectorTile && _vtService) {
+             _vtService = null;
            }
 
+           return _vtService;
+         }
 
-           function startHouse() {
-               if (context.mode().id !== 'add-area') {
-                   return continueTo(addHouse);
-               }
+         function showLayer() {
+           layerOn();
+           layer.style('opacity', 0).transition().duration(250).style('opacity', 1).on('end', function () {
+             dispatch.call('change');
+           });
+         }
 
-               _houseID = null;
-               context.map().zoomEase(20, 500);
+         function hideLayer() {
+           throttledRedraw.cancel();
+           layer.transition().duration(250).style('opacity', 0).on('end', layerOff);
+         }
 
-               timeout(function() {
-                   var startString = helpString('intro.buildings.start_building') +
-                       helpString('intro.buildings.building_corner_' + (context.lastPointerType() === 'mouse' ? 'click' : 'tap'));
-                   revealHouse(house, startString);
+         function layerOn() {
+           layer.style('display', 'block');
+         }
 
-                   context.map().on('move.intro drawn.intro', function() {
-                       revealHouse(house, startString, { duration: 0 });
-                   });
+         function layerOff() {
+           layer.selectAll('.viewfield-group').remove();
+           layer.style('display', 'none');
+         } // ensure that all geojson features in a collection have IDs
 
-                   context.on('enter.intro', function(mode) {
-                       if (mode.id !== 'draw-area') return chapter.restart();
-                       continueTo(continueHouse);
-                   });
 
-               }, 550);  // after easing
+         function ensureIDs(gj) {
+           if (!gj) return null;
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
+           if (gj.type === 'FeatureCollection') {
+             for (var i = 0; i < gj.features.length; i++) {
+               ensureFeatureID(gj.features[i]);
+             }
+           } else {
+             ensureFeatureID(gj);
            }
 
+           return gj;
+         } // ensure that each single Feature object has a unique ID
 
-           function continueHouse() {
-               if (context.mode().id !== 'draw-area') {
-                   return continueTo(addHouse);
-               }
-
-               _houseID = null;
-
-               var continueString = helpString('intro.buildings.continue_building') + '{br}' +
-                   helpString('intro.areas.finish_area_' + (context.lastPointerType() === 'mouse' ? 'click' : 'tap')) +
-                   helpString('intro.buildings.finish_building');
 
-               revealHouse(house, continueString);
+         function ensureFeatureID(feature) {
+           if (!feature) return;
+           feature.__featurehash__ = utilHashcode(fastJsonStableStringify(feature));
+           return feature;
+         } // Prefer an array of Features instead of a FeatureCollection
 
-               context.map().on('move.intro drawn.intro', function() {
-                   revealHouse(house, continueString, { duration: 0 });
-               });
-
-               context.on('enter.intro', function(mode) {
-                   if (mode.id === 'draw-area') {
-                       return;
-                   } else if (mode.id === 'select') {
-                       var graph = context.graph();
-                       var way = context.entity(context.selectedIDs()[0]);
-                       var nodes = graph.childNodes(way);
-                       var points = utilArrayUniq(nodes)
-                           .map(function(n) { return context.projection(n.loc); });
-
-                       if (isMostlySquare(points)) {
-                           _houseID = way.id;
-                           return continueTo(chooseCategoryBuilding);
-                       } else {
-                           return continueTo(retryHouse);
-                       }
 
-                   } else {
-                       return chapter.restart();
-                   }
-               });
+         function getFeatures(gj) {
+           if (!gj) return [];
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
+           if (gj.type === 'FeatureCollection') {
+             return gj.features;
+           } else {
+             return [gj];
            }
+         }
 
+         function featureKey(d) {
+           return d.__featurehash__;
+         }
 
-           function retryHouse() {
-               var onClick = function() { continueTo(addHouse); };
-
-               revealHouse(house, helpString('intro.buildings.retry_building'),
-                   { buttonText: _t('intro.ok'), buttonCallback: onClick }
-               );
+         function isPolygon(d) {
+           return d.geometry.type === 'Polygon' || d.geometry.type === 'MultiPolygon';
+         }
 
-               context.map().on('move.intro drawn.intro', function() {
-                   revealHouse(house, helpString('intro.buildings.retry_building'),
-                       { duration: 0, buttonText: _t('intro.ok'), buttonCallback: onClick }
-                   );
-               });
+         function clipPathID(d) {
+           return 'ideditor-data-' + d.__featurehash__ + '-clippath';
+         }
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   nextStep();
-               }
-           }
+         function featureClasses(d) {
+           return ['data' + d.__featurehash__, d.geometry.type, isPolygon(d) ? 'area' : '', d.__layerID__ || ''].filter(Boolean).join(' ');
+         }
 
+         function drawData(selection) {
+           var vtService = getService();
+           var getPath = svgPath(projection).geojson;
+           var getAreaPath = svgPath(projection, null, true).geojson;
+           var hasData = drawData.hasData();
+           layer = selection.selectAll('.layer-mapdata').data(_enabled && hasData ? [0] : []);
+           layer.exit().remove();
+           layer = layer.enter().append('g').attr('class', 'layer-mapdata').merge(layer);
+           var surface = context.surface();
+           if (!surface || surface.empty()) return; // not ready to draw yet, starting up
+           // Gather data
 
-           function chooseCategoryBuilding() {
-               if (!_houseID || !context.hasEntity(_houseID)) {
-                   return addHouse();
-               }
-               var ids = context.selectedIDs();
-               if (context.mode().id !== 'select' || !ids.length || ids[0] !== _houseID) {
-                   context.enter(modeSelect(context, [_houseID]));
-               }
+           var geoData, polygonData;
 
-               // disallow scrolling
-               context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+           if (_template && vtService) {
+             // fetch data from vector tile service
+             var sourceID = _template;
+             vtService.loadTiles(sourceID, _template, projection);
+             geoData = vtService.data(sourceID, projection);
+           } else {
+             geoData = getFeatures(_geojson);
+           }
+
+           geoData = geoData.filter(getPath);
+           polygonData = geoData.filter(isPolygon); // Draw clip paths for polygons
+
+           var clipPaths = surface.selectAll('defs').selectAll('.clipPath-data').data(polygonData, featureKey);
+           clipPaths.exit().remove();
+           var clipPathsEnter = clipPaths.enter().append('clipPath').attr('class', 'clipPath-data').attr('id', clipPathID);
+           clipPathsEnter.append('path');
+           clipPaths.merge(clipPathsEnter).selectAll('path').attr('d', getAreaPath); // Draw fill, shadow, stroke layers
+
+           var datagroups = layer.selectAll('g.datagroup').data(['fill', 'shadow', 'stroke']);
+           datagroups = datagroups.enter().append('g').attr('class', function (d) {
+             return 'datagroup datagroup-' + d;
+           }).merge(datagroups); // Draw paths
+
+           var pathData = {
+             fill: polygonData,
+             shadow: geoData,
+             stroke: geoData
+           };
+           var paths = datagroups.selectAll('path').data(function (layer) {
+             return pathData[layer];
+           }, featureKey); // exit
+
+           paths.exit().remove(); // enter/update
+
+           paths = paths.enter().append('path').attr('class', function (d) {
+             var datagroup = this.parentNode.__data__;
+             return 'pathdata ' + datagroup + ' ' + featureClasses(d);
+           }).attr('clip-path', function (d) {
+             var datagroup = this.parentNode.__data__;
+             return datagroup === 'fill' ? 'url(#' + clipPathID(d) + ')' : null;
+           }).merge(paths).attr('d', function (d) {
+             var datagroup = this.parentNode.__data__;
+             return datagroup === 'fill' ? getAreaPath(d) : getPath(d);
+           }); // Draw labels
+
+           layer.call(drawLabels, 'label-halo', geoData).call(drawLabels, 'label', geoData);
+
+           function drawLabels(selection, textClass, data) {
+             var labelPath = d3_geoPath(projection);
+             var labelData = data.filter(function (d) {
+               return _showLabels && d.properties && (d.properties.desc || d.properties.name);
+             });
+             var labels = selection.selectAll('text.' + textClass).data(labelData, featureKey); // exit
+
+             labels.exit().remove(); // enter/update
+
+             labels = labels.enter().append('text').attr('class', function (d) {
+               return textClass + ' ' + featureClasses(d);
+             }).merge(labels).text(function (d) {
+               return d.properties.desc || d.properties.name;
+             }).attr('x', function (d) {
+               var centroid = labelPath.centroid(d);
+               return centroid[0] + 11;
+             }).attr('y', function (d) {
+               var centroid = labelPath.centroid(d);
+               return centroid[1];
+             });
+           }
+         }
 
-               timeout(function() {
-                   // reset pane, in case user somehow happened to change it..
-                   context.container().select('.inspector-wrap .panewrap').style('right', '-100%');
+         function getExtension(fileName) {
+           if (!fileName) return;
+           var re = /\.(gpx|kml|(geo)?json)$/i;
+           var match = fileName.toLowerCase().match(re);
+           return match && match.length && match[0];
+         }
 
-                   var button = context.container().select('.preset-category-building .preset-list-button');
+         function xmlToDom(textdata) {
+           return new DOMParser().parseFromString(textdata, 'text/xml');
+         }
 
-                   reveal(button.node(),
-                       helpString('intro.buildings.choose_category_building', { category: buildingCatetory.name() })
-                   );
+         drawData.setFile = function (extension, data) {
+           _template = null;
+           _fileList = null;
+           _geojson = null;
+           _src = null;
+           var gj;
 
-                   button.on('click.intro', function() {
-                       button.on('click.intro', null);
-                       continueTo(choosePresetHouse);
-                   });
+           switch (extension) {
+             case '.gpx':
+               gj = togeojson.gpx(xmlToDom(data));
+               break;
 
-               }, 400);  // after preset list pane visible..
+             case '.kml':
+               gj = togeojson.kml(xmlToDom(data));
+               break;
 
+             case '.geojson':
+             case '.json':
+               gj = JSON.parse(data);
+               break;
+           }
 
-               context.on('enter.intro', function(mode) {
-                   if (!_houseID || !context.hasEntity(_houseID)) {
-                       return continueTo(addHouse);
-                   }
-                   var ids = context.selectedIDs();
-                   if (mode.id !== 'select' || !ids.length || ids[0] !== _houseID) {
-                       return continueTo(chooseCategoryBuilding);
-                   }
-               });
+           gj = gj || {};
 
-               function continueTo(nextStep) {
-                   context.container().select('.inspector-wrap').on('wheel.intro', null);
-                   context.container().select('.preset-list-button').on('click.intro', null);
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
+           if (Object.keys(gj).length) {
+             _geojson = ensureIDs(gj);
+             _src = extension + ' data file';
+             this.fitZoom();
            }
 
+           dispatch.call('change');
+           return this;
+         };
 
-           function choosePresetHouse() {
-               if (!_houseID || !context.hasEntity(_houseID)) {
-                   return addHouse();
-               }
-               var ids = context.selectedIDs();
-               if (context.mode().id !== 'select' || !ids.length || ids[0] !== _houseID) {
-                   context.enter(modeSelect(context, [_houseID]));
-               }
+         drawData.showLabels = function (val) {
+           if (!arguments.length) return _showLabels;
+           _showLabels = val;
+           return this;
+         };
 
-               // disallow scrolling
-               context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+         drawData.enabled = function (val) {
+           if (!arguments.length) return _enabled;
+           _enabled = val;
 
-               timeout(function() {
-                   // reset pane, in case user somehow happened to change it..
-                   context.container().select('.inspector-wrap .panewrap').style('right', '-100%');
+           if (_enabled) {
+             showLayer();
+           } else {
+             hideLayer();
+           }
 
-                   var button = context.container().select('.preset-building-house .preset-list-button');
+           dispatch.call('change');
+           return this;
+         };
 
-                   reveal(button.node(),
-                       helpString('intro.buildings.choose_preset_house', { preset: housePreset.name() }),
-                       { duration: 300 }
-                   );
+         drawData.hasData = function () {
+           var gj = _geojson || {};
+           return !!(_template || Object.keys(gj).length);
+         };
 
-                   button.on('click.intro', function() {
-                       button.on('click.intro', null);
-                       continueTo(closeEditorHouse);
-                   });
+         drawData.template = function (val, src) {
+           if (!arguments.length) return _template; // test source against OSM imagery blocklists..
 
-               }, 400);  // after preset list pane visible..
+           var osm = context.connection();
 
-               context.on('enter.intro', function(mode) {
-                   if (!_houseID || !context.hasEntity(_houseID)) {
-                       return continueTo(addHouse);
-                   }
-                   var ids = context.selectedIDs();
-                   if (mode.id !== 'select' || !ids.length || ids[0] !== _houseID) {
-                       return continueTo(chooseCategoryBuilding);
-                   }
-               });
+           if (osm) {
+             var blocklists = osm.imageryBlocklists();
+             var fail = false;
+             var tested = 0;
+             var regex;
 
-               function continueTo(nextStep) {
-                   context.container().select('.inspector-wrap').on('wheel.intro', null);
-                   context.container().select('.preset-list-button').on('click.intro', null);
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
-           }
+             for (var i = 0; i < blocklists.length; i++) {
+               regex = blocklists[i];
+               fail = regex.test(val);
+               tested++;
+               if (fail) break;
+             } // ensure at least one test was run.
 
 
-           function closeEditorHouse() {
-               if (!_houseID || !context.hasEntity(_houseID)) {
-                   return addHouse();
-               }
-               var ids = context.selectedIDs();
-               if (context.mode().id !== 'select' || !ids.length || ids[0] !== _houseID) {
-                   context.enter(modeSelect(context, [_houseID]));
-               }
+             if (!tested) {
+               regex = /.*\.google(apis)?\..*\/(vt|kh)[\?\/].*([xyz]=.*){3}.*/;
+               fail = regex.test(val);
+             }
+           }
 
-               context.history().checkpoint('hasHouse');
+           _template = val;
+           _fileList = null;
+           _geojson = null; // strip off the querystring/hash from the template,
+           // it often includes the access token
 
-               context.on('exit.intro', function() {
-                   continueTo(rightClickHouse);
-               });
+           _src = src || 'vectortile:' + val.split(/[?#]/)[0];
+           dispatch.call('change');
+           return this;
+         };
 
-               timeout(function() {
-                   reveal('.entity-editor-pane',
-                       helpString('intro.buildings.close', { button: icon('#iD-icon-close', 'pre-text') })
-                   );
-               }, 500);
+         drawData.geojson = function (gj, src) {
+           if (!arguments.length) return _geojson;
+           _template = null;
+           _fileList = null;
+           _geojson = null;
+           _src = null;
+           gj = gj || {};
 
-               function continueTo(nextStep) {
-                   context.on('exit.intro', null);
-                   nextStep();
-               }
+           if (Object.keys(gj).length) {
+             _geojson = ensureIDs(gj);
+             _src = src || 'unknown.geojson';
            }
 
+           dispatch.call('change');
+           return this;
+         };
 
-           function rightClickHouse() {
-               if (!_houseID) return chapter.restart();
+         drawData.fileList = function (fileList) {
+           if (!arguments.length) return _fileList;
+           _template = null;
+           _fileList = fileList;
+           _geojson = null;
+           _src = null;
+           if (!fileList || !fileList.length) return this;
+           var f = fileList[0];
+           var extension = getExtension(f.name);
+           var reader = new FileReader();
+
+           reader.onload = function () {
+             return function (e) {
+               drawData.setFile(extension, e.target.result);
+             };
+           }();
 
-               context.enter(modeBrowse(context));
-               context.history().reset('hasHouse');
-               var zoom = context.map().zoom();
-               if (zoom < 20) {
-                   zoom = 20;
-               }
-               context.map().centerZoomEase(house, zoom, 500);
-
-               context.on('enter.intro', function(mode) {
-                   if (mode.id !== 'select') return;
-                   var ids = context.selectedIDs();
-                   if (ids.length !== 1 || ids[0] !== _houseID) return;
-
-                   timeout(function() {
-                       var node = selectMenuItem(context, 'orthogonalize').node();
-                       if (!node) return;
-                       continueTo(clickSquare);
-                   }, 50);  // after menu visible
-               });
+           reader.readAsText(f);
+           return this;
+         };
 
-               context.map().on('move.intro drawn.intro', function() {
-                   var rightclickString = helpString('intro.buildings.' + (context.lastPointerType() === 'mouse' ? 'rightclick_building' : 'edit_menu_building_touch'));
-                   revealHouse(house, rightclickString, { duration: 0 });
-               });
+         drawData.url = function (url, defaultExtension) {
+           _template = null;
+           _fileList = null;
+           _geojson = null;
+           _src = null; // strip off any querystring/hash from the url before checking extension
 
-               context.history().on('change.intro', function() {
-                   continueTo(rightClickHouse);
-               });
+           var testUrl = url.split(/[?#]/)[0];
+           var extension = getExtension(testUrl) || defaultExtension;
 
-               function continueTo(nextStep) {
-                   context.on('enter.intro', null);
-                   context.map().on('move.intro drawn.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
-               }
+           if (extension) {
+             _template = null;
+             d3_text(url).then(function (data) {
+               drawData.setFile(extension, data);
+             })["catch"](function () {
+               /* ignore */
+             });
+           } else {
+             drawData.template(url);
            }
 
+           return this;
+         };
 
-           function clickSquare() {
-               if (!_houseID) return chapter.restart();
-               var entity = context.hasEntity(_houseID);
-               if (!entity) return continueTo(rightClickHouse);
-
-               var node = selectMenuItem(context, 'orthogonalize').node();
-               if (!node) { return continueTo(rightClickHouse); }
+         drawData.getSrc = function () {
+           return _src || '';
+         };
 
-               var wasChanged = false;
+         drawData.fitZoom = function () {
+           var features = getFeatures(_geojson);
+           if (!features.length) return;
+           var map = context.map();
+           var viewport = map.trimmedExtent().polygon();
+           var coords = features.reduce(function (coords, feature) {
+             var geom = feature.geometry;
+             if (!geom) return coords;
+             var c = geom.coordinates;
+             /* eslint-disable no-fallthrough */
 
-               reveal('.edit-menu',
-                   helpString('intro.buildings.square_building'),
-                   { padding: 50 }
-               );
+             switch (geom.type) {
+               case 'Point':
+                 c = [c];
 
-               context.on('enter.intro', function(mode) {
-                   if (mode.id === 'browse') {
-                       continueTo(rightClickHouse);
-                   } else if (mode.id === 'move' || mode.id === 'rotate') {
-                       continueTo(retryClickSquare);
-                   }
-               });
+               case 'MultiPoint':
+               case 'LineString':
+                 break;
 
-               context.map().on('move.intro', function() {
-                   var node = selectMenuItem(context, 'orthogonalize').node();
-                   if (!wasChanged && !node) { return continueTo(rightClickHouse); }
+               case 'MultiPolygon':
+                 c = utilArrayFlatten(c);
 
-                   reveal('.edit-menu',
-                       helpString('intro.buildings.square_building'),
-                       { duration: 0, padding: 50 }
-                   );
-               });
+               case 'Polygon':
+               case 'MultiLineString':
+                 c = utilArrayFlatten(c);
+                 break;
+             }
+             /* eslint-enable no-fallthrough */
 
-               context.history().on('change.intro', function() {
-                   wasChanged = true;
-                   context.history().on('change.intro', null);
 
-                   // Something changed.  Wait for transition to complete and check undo annotation.
-                   timeout(function() {
-                       if (context.history().undoAnnotation() === _t('operations.orthogonalize.annotation.feature.single')) {
-                           continueTo(doneSquare);
-                       } else {
-                           continueTo(retryClickSquare);
-                       }
-                   }, 500);  // after transitioned actions
-               });
+             return utilArrayUnion(coords, c);
+           }, []);
 
-               function continueTo(nextStep) {
-                   context.on('enter.intro', null);
-                   context.map().on('move.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
-               }
+           if (!geoPolygonIntersectsPolygon(viewport, coords, true)) {
+             var extent = geoExtent(d3_geoBounds({
+               type: 'LineString',
+               coordinates: coords
+             }));
+             map.centerZoom(extent.center(), map.trimmedExtentZoom(extent));
            }
 
+           return this;
+         };
 
-           function retryClickSquare() {
-               context.enter(modeBrowse(context));
+         init();
+         return drawData;
+       }
 
-               revealHouse(house, helpString('intro.buildings.retry_square'), {
-                   buttonText: _t('intro.ok'),
-                   buttonCallback: function() { continueTo(rightClickHouse); }
-               });
+       function svgDebug(projection, context) {
+         function drawDebug(selection) {
+           var showTile = context.getDebug('tile');
+           var showCollision = context.getDebug('collision');
+           var showImagery = context.getDebug('imagery');
+           var showTouchTargets = context.getDebug('target');
+           var showDownloaded = context.getDebug('downloaded');
+           var debugData = [];
 
-               function continueTo(nextStep) {
-                   nextStep();
-               }
+           if (showTile) {
+             debugData.push({
+               "class": 'red',
+               label: 'tile'
+             });
            }
 
+           if (showCollision) {
+             debugData.push({
+               "class": 'yellow',
+               label: 'collision'
+             });
+           }
 
-           function doneSquare() {
-               context.history().checkpoint('doneSquare');
+           if (showImagery) {
+             debugData.push({
+               "class": 'orange',
+               label: 'imagery'
+             });
+           }
 
-               revealHouse(house, helpString('intro.buildings.done_square'), {
-                   buttonText: _t('intro.ok'),
-                   buttonCallback: function() { continueTo(addTank); }
-               });
+           if (showTouchTargets) {
+             debugData.push({
+               "class": 'pink',
+               label: 'touchTargets'
+             });
+           }
 
-               function continueTo(nextStep) {
-                   nextStep();
-               }
+           if (showDownloaded) {
+             debugData.push({
+               "class": 'purple',
+               label: 'downloaded'
+             });
            }
 
+           var legend = context.container().select('.main-content').selectAll('.debug-legend').data(debugData.length ? [0] : []);
+           legend.exit().remove();
+           legend = legend.enter().append('div').attr('class', 'fillD debug-legend').merge(legend);
+           var legendItems = legend.selectAll('.debug-legend-item').data(debugData, function (d) {
+             return d.label;
+           });
+           legendItems.exit().remove();
+           legendItems.enter().append('span').attr('class', function (d) {
+             return "debug-legend-item ".concat(d["class"]);
+           }).text(function (d) {
+             return d.label;
+           });
+           var layer = selection.selectAll('.layer-debug').data(showImagery || showDownloaded ? [0] : []);
+           layer.exit().remove();
+           layer = layer.enter().append('g').attr('class', 'layer-debug').merge(layer); // imagery
+
+           var extent = context.map().extent();
+           _mainFileFetcher.get('imagery').then(function (d) {
+             var hits = showImagery && d.query.bbox(extent.rectangle(), true) || [];
+             var features = hits.map(function (d) {
+               return d.features[d.id];
+             });
+             var imagery = layer.selectAll('path.debug-imagery').data(features);
+             imagery.exit().remove();
+             imagery.enter().append('path').attr('class', 'debug-imagery debug orange');
+           })["catch"](function () {
+             /* ignore */
+           }); // downloaded
+
+           var osm = context.connection();
+           var dataDownloaded = [];
 
-           function addTank() {
-               context.enter(modeBrowse(context));
-               context.history().reset('doneSquare');
-               _tankID = null;
+           if (osm && showDownloaded) {
+             var rtree = osm.caches('get').tile.rtree;
+             dataDownloaded = rtree.all().map(function (bbox) {
+               return {
+                 type: 'Feature',
+                 properties: {
+                   id: bbox.id
+                 },
+                 geometry: {
+                   type: 'Polygon',
+                   coordinates: [[[bbox.minX, bbox.minY], [bbox.minX, bbox.maxY], [bbox.maxX, bbox.maxY], [bbox.maxX, bbox.minY], [bbox.minX, bbox.minY]]]
+                 }
+               };
+             });
+           }
 
-               var msec = transitionTime(tank, context.map().center());
-               if (msec) { reveal(null, null, { duration: 0 }); }
-               context.map().centerZoomEase(tank, 19.5, msec);
+           var downloaded = layer.selectAll('path.debug-downloaded').data(showDownloaded ? dataDownloaded : []);
+           downloaded.exit().remove();
+           downloaded.enter().append('path').attr('class', 'debug-downloaded debug purple'); // update
 
-               timeout(function() {
-                   reveal('button.add-area',
-                       helpString('intro.buildings.add_tank')
-                   );
+           layer.selectAll('path').attr('d', svgPath(projection).geojson);
+         } // This looks strange because `enabled` methods on other layers are
+         // chainable getter/setters, and this one is just a getter.
 
-                   context.on('enter.intro', function(mode) {
-                       if (mode.id !== 'add-area') return;
-                       continueTo(startTank);
-                   });
-               }, msec + 100);
 
-               function continueTo(nextStep) {
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
+         drawDebug.enabled = function () {
+           if (!arguments.length) {
+             return context.getDebug('tile') || context.getDebug('collision') || context.getDebug('imagery') || context.getDebug('target') || context.getDebug('downloaded');
+           } else {
+             return this;
            }
+         };
 
+         return drawDebug;
+       }
 
-           function startTank() {
-               if (context.mode().id !== 'add-area') {
-                   return continueTo(addTank);
-               }
+       /*
+           A standalone SVG element that contains only a `defs` sub-element. To be
+           used once globally, since defs IDs must be unique within a document.
+       */
 
-               _tankID = null;
+       function svgDefs(context) {
+         var _defsSelection = select(null);
 
-               timeout(function() {
-                   var startString = helpString('intro.buildings.start_tank') +
-                       helpString('intro.buildings.tank_edge_' + (context.lastPointerType() === 'mouse' ? 'click' : 'tap'));
-                   revealTank(tank, startString);
+         var _spritesheetIds = ['iD-sprite', 'maki-sprite', 'temaki-sprite', 'fa-sprite', 'community-sprite'];
 
-                   context.map().on('move.intro drawn.intro', function() {
-                       revealTank(tank, startString, { duration: 0 });
-                   });
+         function drawDefs(selection) {
+           _defsSelection = selection.append('defs'); // add markers
 
-                   context.on('enter.intro', function(mode) {
-                       if (mode.id !== 'draw-area') return chapter.restart();
-                       continueTo(continueTank);
-                   });
+           _defsSelection.append('marker').attr('id', 'ideditor-oneway-marker').attr('viewBox', '0 0 10 5').attr('refX', 2.5).attr('refY', 2.5).attr('markerWidth', 2).attr('markerHeight', 2).attr('markerUnits', 'strokeWidth').attr('orient', 'auto').append('path').attr('class', 'oneway-marker-path').attr('d', 'M 5,3 L 0,3 L 0,2 L 5,2 L 5,0 L 10,2.5 L 5,5 z').attr('stroke', 'none').attr('fill', '#000').attr('opacity', '0.75'); // SVG markers have to be given a colour where they're defined
+           // (they can't inherit it from the line they're attached to),
+           // so we need to manually define markers for each color of tag
+           // (also, it's slightly nicer if we can control the
+           // positioning for different tags)
 
-               }, 550);  // after easing
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
+           function addSidedMarker(name, color, offset) {
+             _defsSelection.append('marker').attr('id', 'ideditor-sided-marker-' + name).attr('viewBox', '0 0 2 2').attr('refX', 1).attr('refY', -offset).attr('markerWidth', 1.5).attr('markerHeight', 1.5).attr('markerUnits', 'strokeWidth').attr('orient', 'auto').append('path').attr('class', 'sided-marker-path sided-marker-' + name + '-path').attr('d', 'M 0,0 L 1,1 L 2,0 z').attr('stroke', 'none').attr('fill', color);
            }
 
+           addSidedMarker('natural', 'rgb(170, 170, 170)', 0); // for a coastline, the arrows are (somewhat unintuitively) on
+           // the water side, so let's color them blue (with a gap) to
+           // give a stronger indication
 
-           function continueTank() {
-               if (context.mode().id !== 'draw-area') {
-                   return continueTo(addTank);
-               }
-
-               _tankID = null;
+           addSidedMarker('coastline', '#77dede', 1);
+           addSidedMarker('waterway', '#77dede', 1); // barriers have a dashed line, and separating the triangle
+           // from the line visually suits that
 
-               var continueString = helpString('intro.buildings.continue_tank') + '{br}' +
-                   helpString('intro.areas.finish_area_' + (context.lastPointerType() === 'mouse' ? 'click' : 'tap')) +
-                   helpString('intro.buildings.finish_tank');
+           addSidedMarker('barrier', '#ddd', 1);
+           addSidedMarker('man_made', '#fff', 0);
 
-               revealTank(tank, continueString);
+           _defsSelection.append('marker').attr('id', 'ideditor-viewfield-marker').attr('viewBox', '0 0 16 16').attr('refX', 8).attr('refY', 16).attr('markerWidth', 4).attr('markerHeight', 4).attr('markerUnits', 'strokeWidth').attr('orient', 'auto').append('path').attr('class', 'viewfield-marker-path').attr('d', 'M 6,14 C 8,13.4 8,13.4 10,14 L 16,3 C 12,0 4,0 0,3 z').attr('fill', '#333').attr('fill-opacity', '0.75').attr('stroke', '#fff').attr('stroke-width', '0.5px').attr('stroke-opacity', '0.75');
 
-               context.map().on('move.intro drawn.intro', function() {
-                   revealTank(tank, continueString, { duration: 0 });
-               });
+           _defsSelection.append('marker').attr('id', 'ideditor-viewfield-marker-wireframe').attr('viewBox', '0 0 16 16').attr('refX', 8).attr('refY', 16).attr('markerWidth', 4).attr('markerHeight', 4).attr('markerUnits', 'strokeWidth').attr('orient', 'auto').append('path').attr('class', 'viewfield-marker-path').attr('d', 'M 6,14 C 8,13.4 8,13.4 10,14 L 16,3 C 12,0 4,0 0,3 z').attr('fill', 'none').attr('stroke', '#fff').attr('stroke-width', '0.5px').attr('stroke-opacity', '0.75'); // add patterns
 
-               context.on('enter.intro', function(mode) {
-                   if (mode.id === 'draw-area') {
-                       return;
-                   } else if (mode.id === 'select') {
-                       _tankID = context.selectedIDs()[0];
-                       return continueTo(searchPresetTank);
-                   } else {
-                       return continueTo(addTank);
-                   }
-               });
 
-               function continueTo(nextStep) {
-                   context.map().on('move.intro drawn.intro', null);
-                   context.on('enter.intro', null);
-                   nextStep();
-               }
-           }
+           var patterns = _defsSelection.selectAll('pattern').data([// pattern name, pattern image name
+           ['beach', 'dots'], ['construction', 'construction'], ['cemetery', 'cemetery'], ['cemetery_christian', 'cemetery_christian'], ['cemetery_buddhist', 'cemetery_buddhist'], ['cemetery_muslim', 'cemetery_muslim'], ['cemetery_jewish', 'cemetery_jewish'], ['farmland', 'farmland'], ['farmyard', 'farmyard'], ['forest', 'forest'], ['forest_broadleaved', 'forest_broadleaved'], ['forest_needleleaved', 'forest_needleleaved'], ['forest_leafless', 'forest_leafless'], ['golf_green', 'grass'], ['grass', 'grass'], ['landfill', 'landfill'], ['meadow', 'grass'], ['orchard', 'orchard'], ['pond', 'pond'], ['quarry', 'quarry'], ['scrub', 'bushes'], ['vineyard', 'vineyard'], ['water_standing', 'lines'], ['waves', 'waves'], ['wetland', 'wetland'], ['wetland_marsh', 'wetland_marsh'], ['wetland_swamp', 'wetland_swamp'], ['wetland_bog', 'wetland_bog'], ['wetland_reedbed', 'wetland_reedbed']]).enter().append('pattern').attr('id', function (d) {
+             return 'ideditor-pattern-' + d[0];
+           }).attr('width', 32).attr('height', 32).attr('patternUnits', 'userSpaceOnUse');
 
+           patterns.append('rect').attr('x', 0).attr('y', 0).attr('width', 32).attr('height', 32).attr('class', function (d) {
+             return 'pattern-color-' + d[0];
+           });
+           patterns.append('image').attr('x', 0).attr('y', 0).attr('width', 32).attr('height', 32).attr('xlink:href', function (d) {
+             return context.imagePath('pattern/' + d[1] + '.png');
+           }); // add clip paths
 
-           function searchPresetTank() {
-               if (!_tankID || !context.hasEntity(_tankID)) {
-                   return addTank();
-               }
-               var ids = context.selectedIDs();
-               if (context.mode().id !== 'select' || !ids.length || ids[0] !== _tankID) {
-                   context.enter(modeSelect(context, [_tankID]));
-               }
+           _defsSelection.selectAll('clipPath').data([12, 18, 20, 32, 45]).enter().append('clipPath').attr('id', function (d) {
+             return 'ideditor-clip-square-' + d;
+           }).append('rect').attr('x', 0).attr('y', 0).attr('width', function (d) {
+             return d;
+           }).attr('height', function (d) {
+             return d;
+           }); // add symbol spritesheets
 
-               // disallow scrolling
-               context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
 
-               timeout(function() {
-                   // reset pane, in case user somehow happened to change it..
-                   context.container().select('.inspector-wrap .panewrap').style('right', '-100%');
+           addSprites(_spritesheetIds, true);
+         }
 
-                   context.container().select('.preset-search-input')
-                       .on('keydown.intro', null)
-                       .on('keyup.intro', checkPresetSearch);
+         function addSprites(ids, overrideColors) {
+           _spritesheetIds = utilArrayUniq(_spritesheetIds.concat(ids));
 
-                   reveal('.preset-search-input',
-                       helpString('intro.buildings.search_tank', { preset: tankPreset.name() })
-                   );
-               }, 400);  // after preset list pane visible..
+           var spritesheets = _defsSelection.selectAll('.spritesheet').data(_spritesheetIds);
 
-               context.on('enter.intro', function(mode) {
-                   if (!_tankID || !context.hasEntity(_tankID)) {
-                       return continueTo(addTank);
-                   }
+           spritesheets.enter().append('g').attr('class', function (d) {
+             return 'spritesheet spritesheet-' + d;
+           }).each(function (d) {
+             var url = context.imagePath(d + '.svg');
+             var node = select(this).node();
+             svg(url).then(function (svg) {
+               node.appendChild(select(svg.documentElement).attr('id', 'ideditor-' + d).node());
 
-                   var ids = context.selectedIDs();
-                   if (mode.id !== 'select' || !ids.length || ids[0] !== _tankID) {
-                       // keep the user's area selected..
-                       context.enter(modeSelect(context, [_tankID]));
+               if (overrideColors && d !== 'iD-sprite') {
+                 // allow icon colors to be overridden..
+                 select(node).selectAll('path').attr('fill', 'currentColor');
+               }
+             })["catch"](function () {
+               /* ignore */
+             });
+           });
+           spritesheets.exit().remove();
+         }
 
-                       // reset pane, in case user somehow happened to change it..
-                       context.container().select('.inspector-wrap .panewrap').style('right', '-100%');
-                       // disallow scrolling
-                       context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+         drawDefs.addSprites = addSprites;
+         return drawDefs;
+       }
 
-                       context.container().select('.preset-search-input')
-                           .on('keydown.intro', null)
-                           .on('keyup.intro', checkPresetSearch);
+       var _layerEnabled = false;
 
-                       reveal('.preset-search-input',
-                           helpString('intro.buildings.search_tank', { preset: tankPreset.name() })
-                       );
+       var _qaService;
 
-                       context.history().on('change.intro', null);
-                   }
-               });
+       function svgKeepRight(projection, context, dispatch) {
+         var throttledRedraw = throttle(function () {
+           return dispatch.call('change');
+         }, 1000);
 
-               function checkPresetSearch() {
-                   var first = context.container().select('.preset-list-item:first-child');
+         var minZoom = 12;
+         var touchLayer = select(null);
+         var drawLayer = select(null);
+         var layerVisible = false;
 
-                   if (first.classed('preset-man_made-storage_tank')) {
-                       reveal(first.select('.preset-list-button').node(),
-                           helpString('intro.buildings.choose_tank', { preset: tankPreset.name() }),
-                           { duration: 300 }
-                       );
+         function markerPath(selection, klass) {
+           selection.attr('class', klass).attr('transform', 'translate(-4, -24)').attr('d', 'M11.6,6.2H7.1l1.4-5.1C8.6,0.6,8.1,0,7.5,0H2.2C1.7,0,1.3,0.3,1.3,0.8L0,10.2c-0.1,0.6,0.4,1.1,0.9,1.1h4.6l-1.8,7.6C3.6,19.4,4.1,20,4.7,20c0.3,0,0.6-0.2,0.8-0.5l6.9-11.9C12.7,7,12.3,6.2,11.6,6.2z');
+         } // Loosely-coupled keepRight service for fetching issues.
 
-                       context.container().select('.preset-search-input')
-                           .on('keydown.intro', eventCancel, true)
-                           .on('keyup.intro', null);
 
-                       context.history().on('change.intro', function() {
-                           continueTo(closeEditorTank);
-                       });
-                   }
-               }
+         function getService() {
+           if (services.keepRight && !_qaService) {
+             _qaService = services.keepRight;
 
-               function continueTo(nextStep) {
-                   context.container().select('.inspector-wrap').on('wheel.intro', null);
-                   context.on('enter.intro', null);
-                   context.history().on('change.intro', null);
-                   context.container().select('.preset-search-input').on('keydown.intro keyup.intro', null);
-                   nextStep();
-               }
+             _qaService.on('loaded', throttledRedraw);
+           } else if (!services.keepRight && _qaService) {
+             _qaService = null;
            }
 
+           return _qaService;
+         } // Show the markers
 
-           function closeEditorTank() {
-               if (!_tankID || !context.hasEntity(_tankID)) {
-                   return addTank();
-               }
-               var ids = context.selectedIDs();
-               if (context.mode().id !== 'select' || !ids.length || ids[0] !== _tankID) {
-                   context.enter(modeSelect(context, [_tankID]));
-               }
-
-               context.history().checkpoint('hasTank');
 
-               context.on('exit.intro', function() {
-                   continueTo(rightClickTank);
-               });
+         function editOn() {
+           if (!layerVisible) {
+             layerVisible = true;
+             drawLayer.style('display', 'block');
+           }
+         } // Immediately remove the markers and their touch targets
 
-               timeout(function() {
-                   reveal('.entity-editor-pane',
-                       helpString('intro.buildings.close', { button: icon('#iD-icon-close', 'pre-text') })
-                   );
-               }, 500);
 
-               function continueTo(nextStep) {
-                   context.on('exit.intro', null);
-                   nextStep();
-               }
+         function editOff() {
+           if (layerVisible) {
+             layerVisible = false;
+             drawLayer.style('display', 'none');
+             drawLayer.selectAll('.qaItem.keepRight').remove();
+             touchLayer.selectAll('.qaItem.keepRight').remove();
            }
+         } // Enable the layer.  This shows the markers and transitions them to visible.
 
 
-           function rightClickTank() {
-               if (!_tankID) return continueTo(addTank);
-
-               context.enter(modeBrowse(context));
-               context.history().reset('hasTank');
-               context.map().centerEase(tank, 500);
-
-               timeout(function() {
-                   context.on('enter.intro', function(mode) {
-                       if (mode.id !== 'select') return;
-                       var ids = context.selectedIDs();
-                       if (ids.length !== 1 || ids[0] !== _tankID) return;
-
-                       timeout(function() {
-                           var node = selectMenuItem(context, 'circularize').node();
-                           if (!node) return;
-                           continueTo(clickCircle);
-                       }, 50);  // after menu visible
-                   });
+         function layerOn() {
+           editOn();
+           drawLayer.style('opacity', 0).transition().duration(250).style('opacity', 1).on('end interrupt', function () {
+             return dispatch.call('change');
+           });
+         } // Disable the layer.  This transitions the layer invisible and then hides the markers.
 
-                   var rightclickString = helpString('intro.buildings.' + (context.lastPointerType() === 'mouse' ? 'rightclick_tank' : 'edit_menu_tank_touch'));
 
-                   revealTank(tank, rightclickString);
+         function layerOff() {
+           throttledRedraw.cancel();
+           drawLayer.interrupt();
+           touchLayer.selectAll('.qaItem.keepRight').remove();
+           drawLayer.transition().duration(250).style('opacity', 0).on('end interrupt', function () {
+             editOff();
+             dispatch.call('change');
+           });
+         } // Update the issue markers
 
-                   context.map().on('move.intro drawn.intro', function() {
-                       revealTank(tank, rightclickString, { duration: 0 });
-                   });
 
-                   context.history().on('change.intro', function() {
-                       continueTo(rightClickTank);
-                   });
+         function updateMarkers() {
+           if (!layerVisible || !_layerEnabled) return;
+           var service = getService();
+           var selectedID = context.selectedErrorID();
+           var data = service ? service.getItems(projection) : [];
+           var getTransform = svgPointTransform(projection); // Draw markers..
 
-               }, 600);
+           var markers = drawLayer.selectAll('.qaItem.keepRight').data(data, function (d) {
+             return d.id;
+           }); // exit
 
-               function continueTo(nextStep) {
-                   context.on('enter.intro', null);
-                   context.map().on('move.intro drawn.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
-               }
-           }
+           markers.exit().remove(); // enter
 
+           var markersEnter = markers.enter().append('g').attr('class', function (d) {
+             return "qaItem ".concat(d.service, " itemId-").concat(d.id, " itemType-").concat(d.parentIssueType);
+           });
+           markersEnter.append('ellipse').attr('cx', 0.5).attr('cy', 1).attr('rx', 6.5).attr('ry', 3).attr('class', 'stroke');
+           markersEnter.append('path').call(markerPath, 'shadow');
+           markersEnter.append('use').attr('class', 'qaItem-fill').attr('width', '20px').attr('height', '20px').attr('x', '-8px').attr('y', '-22px').attr('xlink:href', '#iD-icon-bolt'); // update
 
-           function clickCircle() {
-               if (!_tankID) return chapter.restart();
-               var entity = context.hasEntity(_tankID);
-               if (!entity) return continueTo(rightClickTank);
+           markers.merge(markersEnter).sort(sortY).classed('selected', function (d) {
+             return d.id === selectedID;
+           }).attr('transform', getTransform); // Draw targets..
 
-               var node = selectMenuItem(context, 'circularize').node();
-               if (!node) { return continueTo(rightClickTank); }
+           if (touchLayer.empty()) return;
+           var fillClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
+           var targets = touchLayer.selectAll('.qaItem.keepRight').data(data, function (d) {
+             return d.id;
+           }); // exit
 
-               var wasChanged = false;
+           targets.exit().remove(); // enter/update
 
-               reveal('.edit-menu',
-                   helpString('intro.buildings.circle_tank'),
-                   { padding: 50 }
-               );
+           targets.enter().append('rect').attr('width', '20px').attr('height', '20px').attr('x', '-8px').attr('y', '-22px').merge(targets).sort(sortY).attr('class', function (d) {
+             return "qaItem ".concat(d.service, " target ").concat(fillClass, " itemId-").concat(d.id);
+           }).attr('transform', getTransform);
 
-               context.on('enter.intro', function(mode) {
-                   if (mode.id === 'browse') {
-                       continueTo(rightClickTank);
-                   } else if (mode.id === 'move' || mode.id === 'rotate') {
-                       continueTo(retryClickCircle);
-                   }
-               });
+           function sortY(a, b) {
+             return a.id === selectedID ? 1 : b.id === selectedID ? -1 : a.severity === 'error' && b.severity !== 'error' ? 1 : b.severity === 'error' && a.severity !== 'error' ? -1 : b.loc[1] - a.loc[1];
+           }
+         } // Draw the keepRight layer and schedule loading issues and updating markers.
 
-               context.map().on('move.intro', function() {
-                   var node = selectMenuItem(context, 'circularize').node();
-                   if (!wasChanged && !node) { return continueTo(rightClickTank); }
 
-                   reveal('.edit-menu',
-                       helpString('intro.buildings.circle_tank'),
-                       { duration: 0, padding: 50 }
-                   );
-               });
+         function drawKeepRight(selection) {
+           var service = getService();
+           var surface = context.surface();
 
-               context.history().on('change.intro', function() {
-                   wasChanged = true;
-                   context.history().on('change.intro', null);
+           if (surface && !surface.empty()) {
+             touchLayer = surface.selectAll('.data-layer.touch .layer-touch.markers');
+           }
 
-                   // Something changed.  Wait for transition to complete and check undo annotation.
-                   timeout(function() {
-                       if (context.history().undoAnnotation() === _t('operations.circularize.annotation.single')) {
-                           continueTo(play);
-                       } else {
-                           continueTo(retryClickCircle);
-                       }
-                   }, 500);  // after transitioned actions
-               });
+           drawLayer = selection.selectAll('.layer-keepRight').data(service ? [0] : []);
+           drawLayer.exit().remove();
+           drawLayer = drawLayer.enter().append('g').attr('class', 'layer-keepRight').style('display', _layerEnabled ? 'block' : 'none').merge(drawLayer);
 
-               function continueTo(nextStep) {
-                   context.on('enter.intro', null);
-                   context.map().on('move.intro', null);
-                   context.history().on('change.intro', null);
-                   nextStep();
-               }
+           if (_layerEnabled) {
+             if (service && ~~context.map().zoom() >= minZoom) {
+               editOn();
+               service.loadIssues(projection);
+               updateMarkers();
+             } else {
+               editOff();
+             }
            }
+         } // Toggles the layer on and off
 
 
-           function retryClickCircle() {
-               context.enter(modeBrowse(context));
+         drawKeepRight.enabled = function (val) {
+           if (!arguments.length) return _layerEnabled;
+           _layerEnabled = val;
 
-               revealTank(tank, helpString('intro.buildings.retry_circle'), {
-                   buttonText: _t('intro.ok'),
-                   buttonCallback: function() { continueTo(rightClickTank); }
-               });
+           if (_layerEnabled) {
+             layerOn();
+           } else {
+             layerOff();
 
-               function continueTo(nextStep) {
-                   nextStep();
-               }
+             if (context.selectedErrorID()) {
+               context.enter(modeBrowse(context));
+             }
            }
 
+           dispatch.call('change');
+           return this;
+         };
 
-           function play() {
-               dispatch$1.call('done');
-               reveal('.ideditor',
-                   helpString('intro.buildings.play', { next: _t('intro.startediting.title') }), {
-                       tooltipBox: '.intro-nav-wrap .chapter-startEditing',
-                       buttonText: _t('intro.ok'),
-                       buttonCallback: function() { reveal('.ideditor'); }
-                   }
-               );
-           }
+         drawKeepRight.supported = function () {
+           return !!getService();
+         };
 
+         return drawKeepRight;
+       }
 
-           chapter.enter = function() {
-               addHouse();
-           };
+       function svgGeolocate(projection) {
+         var layer = select(null);
 
+         var _position;
 
-           chapter.exit = function() {
-               timeouts.forEach(window.clearTimeout);
-               context.on('enter.intro exit.intro', null);
-               context.map().on('move.intro drawn.intro', null);
-               context.history().on('change.intro', null);
-               context.container().select('.inspector-wrap').on('wheel.intro', null);
-               context.container().select('.preset-search-input').on('keydown.intro keyup.intro', null);
-               context.container().select('.more-fields .combobox-input').on('click.intro', null);
-           };
+         function init() {
+           if (svgGeolocate.initialized) return; // run once
 
+           svgGeolocate.enabled = false;
+           svgGeolocate.initialized = true;
+         }
 
-           chapter.restart = function() {
-               chapter.exit();
-               chapter.enter();
-           };
+         function showLayer() {
+           layer.style('display', 'block');
+         }
 
+         function hideLayer() {
+           layer.transition().duration(250).style('opacity', 0);
+         }
 
-           return utilRebind(chapter, dispatch$1, 'on');
-       }
+         function layerOn() {
+           layer.style('opacity', 0).transition().duration(250).style('opacity', 1);
+         }
 
-       function uiIntroStartEditing(context, reveal) {
-           var dispatch$1 = dispatch('done', 'startEditing');
-           var modalSelection = select(null);
+         function layerOff() {
+           layer.style('display', 'none');
+         }
 
+         function transform(d) {
+           return svgPointTransform(projection)(d);
+         }
 
-           var chapter = {
-               title: 'intro.startediting.title'
-           };
+         function accuracy(accuracy, loc) {
+           // converts accuracy to pixels...
+           var degreesRadius = geoMetersToLat(accuracy),
+               tangentLoc = [loc[0], loc[1] + degreesRadius],
+               projectedTangent = projection(tangentLoc),
+               projectedLoc = projection([loc[0], loc[1]]); // southern most point will have higher pixel value...
 
-           function showHelp() {
-               reveal('.map-control.help-control',
-                   helpString('intro.startediting.help'), {
-                       buttonText: _t('intro.ok'),
-                       buttonCallback: function() { shortcuts(); }
-                   }
-               );
-           }
+           return Math.round(projectedLoc[1] - projectedTangent[1]).toString();
+         }
 
-           function shortcuts() {
-               reveal('.map-control.help-control',
-                   helpString('intro.startediting.shortcuts'), {
-                       buttonText: _t('intro.ok'),
-                       buttonCallback: function() { showSave(); }
-                   }
-               );
+         function update() {
+           var geolocation = {
+             loc: [_position.coords.longitude, _position.coords.latitude]
+           };
+           var groups = layer.selectAll('.geolocations').selectAll('.geolocation').data([geolocation]);
+           groups.exit().remove();
+           var pointsEnter = groups.enter().append('g').attr('class', 'geolocation');
+           pointsEnter.append('circle').attr('class', 'geolocate-radius').attr('dx', '0').attr('dy', '0').attr('fill', 'rgb(15,128,225)').attr('fill-opacity', '0.3').attr('r', '0');
+           pointsEnter.append('circle').attr('dx', '0').attr('dy', '0').attr('fill', 'rgb(15,128,225)').attr('stroke', 'white').attr('stroke-width', '1.5').attr('r', '6');
+           groups.merge(pointsEnter).attr('transform', transform);
+           layer.select('.geolocate-radius').attr('r', accuracy(_position.coords.accuracy, geolocation.loc));
+         }
+
+         function drawLocation(selection) {
+           var enabled = svgGeolocate.enabled;
+           layer = selection.selectAll('.layer-geolocate').data([0]);
+           layer.exit().remove();
+           var layerEnter = layer.enter().append('g').attr('class', 'layer-geolocate').style('display', enabled ? 'block' : 'none');
+           layerEnter.append('g').attr('class', 'geolocations');
+           layer = layerEnter.merge(layer);
+
+           if (enabled) {
+             update();
+           } else {
+             layerOff();
            }
+         }
 
-           function showSave() {
-               context.container().selectAll('.shaded').remove();  // in case user opened keyboard shortcuts
-               reveal('.top-toolbar button.save',
-                   helpString('intro.startediting.save'), {
-                       buttonText: _t('intro.ok'),
-                       buttonCallback: function() { showStart(); }
-                   }
-               );
-           }
+         drawLocation.enabled = function (position, enabled) {
+           if (!arguments.length) return svgGeolocate.enabled;
+           _position = position;
+           svgGeolocate.enabled = enabled;
 
-           function showStart() {
-               context.container().selectAll('.shaded').remove();  // in case user opened keyboard shortcuts
+           if (svgGeolocate.enabled) {
+             showLayer();
+             layerOn();
+           } else {
+             hideLayer();
+           }
 
-               modalSelection = uiModal(context.container());
+           return this;
+         };
 
-               modalSelection.select('.modal')
-                   .attr('class', 'modal-splash modal');
+         init();
+         return drawLocation;
+       }
 
-               modalSelection.selectAll('.close').remove();
+       function svgLabels(projection, context) {
+         var path = d3_geoPath(projection);
+         var detected = utilDetect();
+         var baselineHack = detected.ie || detected.browser.toLowerCase() === 'edge' || detected.browser.toLowerCase() === 'firefox' && detected.version >= 70;
 
-               var startbutton = modalSelection.select('.content')
-                   .attr('class', 'fillL')
-                   .append('button')
-                       .attr('class', 'modal-section huge-modal-button')
-                       .on('click', function() {
-                           modalSelection.remove();
-                       });
+         var _rdrawn = new RBush();
 
-                   startbutton
-                       .append('svg')
-                       .attr('class', 'illustration')
-                       .append('use')
-                       .attr('xlink:href', '#iD-logo-walkthrough');
+         var _rskipped = new RBush();
 
-                   startbutton
-                       .append('h2')
-                       .text(_t('intro.startediting.start'));
+         var _textWidthCache = {};
+         var _entitybboxes = {}; // Listed from highest to lowest priority
 
-               dispatch$1.call('startEditing');
-           }
+         var labelStack = [['line', 'aeroway', '*', 12], ['line', 'highway', 'motorway', 12], ['line', 'highway', 'trunk', 12], ['line', 'highway', 'primary', 12], ['line', 'highway', 'secondary', 12], ['line', 'highway', 'tertiary', 12], ['line', 'highway', '*', 12], ['line', 'railway', '*', 12], ['line', 'waterway', '*', 12], ['area', 'aeroway', '*', 12], ['area', 'amenity', '*', 12], ['area', 'building', '*', 12], ['area', 'historic', '*', 12], ['area', 'leisure', '*', 12], ['area', 'man_made', '*', 12], ['area', 'natural', '*', 12], ['area', 'shop', '*', 12], ['area', 'tourism', '*', 12], ['area', 'camp_site', '*', 12], ['point', 'aeroway', '*', 10], ['point', 'amenity', '*', 10], ['point', 'building', '*', 10], ['point', 'historic', '*', 10], ['point', 'leisure', '*', 10], ['point', 'man_made', '*', 10], ['point', 'natural', '*', 10], ['point', 'shop', '*', 10], ['point', 'tourism', '*', 10], ['point', 'camp_site', '*', 10], ['line', 'name', '*', 12], ['area', 'name', '*', 12], ['point', 'name', '*', 10]];
 
+         function shouldSkipIcon(preset) {
+           var noIcons = ['building', 'landuse', 'natural'];
+           return noIcons.some(function (s) {
+             return preset.id.indexOf(s) >= 0;
+           });
+         }
 
-           chapter.enter = function() {
-               showHelp();
+         function get(array, prop) {
+           return function (d, i) {
+             return array[i][prop];
            };
+         }
 
+         function textWidth(text, size, elem) {
+           var c = _textWidthCache[size];
+           if (!c) c = _textWidthCache[size] = {};
 
-           chapter.exit = function() {
-               modalSelection.remove();
-               context.container().selectAll('.shaded').remove();  // in case user opened keyboard shortcuts
-           };
+           if (c[text]) {
+             return c[text];
+           } else if (elem) {
+             c[text] = elem.getComputedTextLength();
+             return c[text];
+           } else {
+             var str = encodeURIComponent(text).match(/%[CDEFcdef]/g);
 
+             if (str === null) {
+               return size / 3 * 2 * text.length;
+             } else {
+               return size / 3 * (2 * text.length + str.length);
+             }
+           }
+         }
 
-           return utilRebind(chapter, dispatch$1, 'on');
-       }
+         function drawLinePaths(selection, entities, filter, classes, labels) {
+           var paths = selection.selectAll('path').filter(filter).data(entities, osmEntity.key); // exit
 
-       const chapterUi = {
-         welcome: uiIntroWelcome,
-         navigation: uiIntroNavigation,
-         point: uiIntroPoint,
-         area: uiIntroArea,
-         line: uiIntroLine,
-         building: uiIntroBuilding,
-         startEditing: uiIntroStartEditing
-       };
+           paths.exit().remove(); // enter/update
 
-       const chapterFlow = [
-         'welcome',
-         'navigation',
-         'point',
-         'area',
-         'line',
-         'building',
-         'startEditing'
-       ];
+           paths.enter().append('path').style('stroke-width', get(labels, 'font-size')).attr('id', function (d) {
+             return 'ideditor-labelpath-' + d.id;
+           }).attr('class', classes).merge(paths).attr('d', get(labels, 'lineString'));
+         }
 
+         function drawLineLabels(selection, entities, filter, classes, labels) {
+           var texts = selection.selectAll('text.' + classes).filter(filter).data(entities, osmEntity.key); // exit
 
-       function uiIntro(context) {
-         const INTRO_IMAGERY = 'EsriWorldImageryClarity';
-         let _introGraph = {};
-         let _currChapter;
+           texts.exit().remove(); // enter
 
+           texts.enter().append('text').attr('class', function (d, i) {
+             return classes + ' ' + labels[i].classes + ' ' + d.id;
+           }).attr('dy', baselineHack ? '0.35em' : null).append('textPath').attr('class', 'textpath'); // update
 
-         function intro(selection) {
-           _mainFileFetcher.get('intro_graph')
-             .then(dataIntroGraph => {
-               // create entities for intro graph and localize names
-               for (let id in dataIntroGraph) {
-                 if (!_introGraph[id]) {
-                   _introGraph[id] = osmEntity(localize(dataIntroGraph[id]));
-                 }
-               }
-               selection.call(startIntro);
-             })
-             .catch(function() { /* ignore */ });
+           selection.selectAll('text.' + classes).selectAll('.textpath').filter(filter).data(entities, osmEntity.key).attr('startOffset', '50%').attr('xlink:href', function (d) {
+             return '#ideditor-labelpath-' + d.id;
+           }).text(utilDisplayNameForPath);
          }
 
+         function drawPointLabels(selection, entities, filter, classes, labels) {
+           var texts = selection.selectAll('text.' + classes).filter(filter).data(entities, osmEntity.key); // exit
 
-         function startIntro(selection) {
-           context.enter(modeBrowse(context));
-
-           // Save current map state
-           let osm = context.connection();
-           let history = context.history().toJSON();
-           let hash = window.location.hash;
-           let center = context.map().center();
-           let zoom = context.map().zoom();
-           let background = context.background().baseLayerSource();
-           let overlays = context.background().overlayLayerSources();
-           let opacity = context.container().selectAll('.main-map .layer-background').style('opacity');
-           let caches = osm && osm.caches();
-           let baseEntities = context.history().graph().base().entities;
-
-           // Show sidebar and disable the sidebar resizing button
-           // (this needs to be before `context.inIntro(true)`)
-           context.ui().sidebar.expand();
-           context.container().selectAll('button.sidebar-toggle').classed('disabled', true);
+           texts.exit().remove(); // enter/update
 
-           // Block saving
-           context.inIntro(true);
+           texts.enter().append('text').attr('class', function (d, i) {
+             return classes + ' ' + labels[i].classes + ' ' + d.id;
+           }).merge(texts).attr('x', get(labels, 'x')).attr('y', get(labels, 'y')).style('text-anchor', get(labels, 'textAnchor')).text(utilDisplayName).each(function (d, i) {
+             textWidth(utilDisplayName(d), labels[i].height, this);
+           });
+         }
 
-           // Load semi-real data used in intro
-           if (osm) { osm.toggle(false).reset(); }
-           context.history().reset();
-           context.history().merge(Object.values(coreGraph().load(_introGraph).entities));
-           context.history().checkpoint('initial');
+         function drawAreaLabels(selection, entities, filter, classes, labels) {
+           entities = entities.filter(hasText);
+           labels = labels.filter(hasText);
+           drawPointLabels(selection, entities, filter, classes, labels);
 
-           // Setup imagery
-           let imagery = context.background().findSource(INTRO_IMAGERY);
-           if (imagery) {
-             context.background().baseLayerSource(imagery);
-           } else {
-             context.background().bing();
+           function hasText(d, i) {
+             return labels[i].hasOwnProperty('x') && labels[i].hasOwnProperty('y');
            }
-           overlays.forEach(d => context.background().toggleOverlayLayer(d));
+         }
 
-           // Setup data layers (only OSM)
-           let layers = context.layers();
-           layers.all().forEach(item => {
-             // if the layer has the function `enabled`
-             if (typeof item.layer.enabled === 'function') {
-               item.layer.enabled(item.id === 'osm');
+         function drawAreaIcons(selection, entities, filter, classes, labels) {
+           var icons = selection.selectAll('use.' + classes).filter(filter).data(entities, osmEntity.key); // exit
+
+           icons.exit().remove(); // enter/update
+
+           icons.enter().append('use').attr('class', 'icon ' + classes).attr('width', '17px').attr('height', '17px').merge(icons).attr('transform', get(labels, 'transform')).attr('xlink:href', function (d) {
+             var preset = _mainPresetIndex.match(d, context.graph());
+             var picon = preset && preset.icon;
+
+             if (!picon) {
+               return '';
+             } else {
+               var isMaki = /^maki-/.test(picon);
+               return '#' + picon + (isMaki ? '-15' : '');
              }
            });
+         }
 
+         function drawCollisionBoxes(selection, rtree, which) {
+           var classes = 'debug ' + which + ' ' + (which === 'debug-skipped' ? 'orange' : 'yellow');
+           var gj = [];
 
-           context.container().selectAll('.main-map .layer-background').style('opacity', 1);
+           if (context.getDebug('collision')) {
+             gj = rtree.all().map(function (d) {
+               return {
+                 type: 'Polygon',
+                 coordinates: [[[d.minX, d.minY], [d.maxX, d.minY], [d.maxX, d.maxY], [d.minX, d.maxY], [d.minX, d.minY]]]
+               };
+             });
+           }
 
-           let curtain = uiCurtain(context.container().node());
-           selection.call(curtain);
+           var boxes = selection.selectAll('.' + which).data(gj); // exit
 
-           // Store that the user started the walkthrough..
-           corePreferences('walkthrough_started', 'yes');
+           boxes.exit().remove(); // enter/update
 
-           // Restore previous walkthrough progress..
-           let storedProgress = corePreferences('walkthrough_progress') || '';
-           let progress = storedProgress.split(';').filter(Boolean);
+           boxes.enter().append('path').attr('class', classes).merge(boxes).attr('d', d3_geoPath());
+         }
 
-           let chapters = chapterFlow.map((chapter, i) => {
-             let s = chapterUi[chapter](context, curtain.reveal)
-               .on('done', () => {
+         function drawLabels(selection, graph, entities, filter, dimensions, fullRedraw) {
+           var wireframe = context.surface().classed('fill-wireframe');
+           var zoom = geoScaleToZoom(projection.scale());
+           var labelable = [];
+           var renderNodeAs = {};
+           var i, j, k, entity, geometry;
 
-                 buttons
-                   .filter(d => d.title === s.title)
-                   .classed('finished', true);
+           for (i = 0; i < labelStack.length; i++) {
+             labelable.push([]);
+           }
 
-                 if (i < chapterFlow.length - 1) {
-                   const next = chapterFlow[i + 1];
-                   context.container().select(`button.chapter-${next}`)
-                     .classed('next', true);
-                 }
+           if (fullRedraw) {
+             _rdrawn.clear();
 
-                 // Store walkthrough progress..
-                 progress.push(chapter);
-                 corePreferences('walkthrough_progress', utilArrayUniq(progress).join(';'));
-               });
-             return s;
-           });
+             _rskipped.clear();
 
-           chapters[chapters.length - 1].on('startEditing', () => {
-             // Store walkthrough progress..
-             progress.push('startEditing');
-             corePreferences('walkthrough_progress', utilArrayUniq(progress).join(';'));
+             _entitybboxes = {};
+           } else {
+             for (i = 0; i < entities.length; i++) {
+               entity = entities[i];
+               var toRemove = [].concat(_entitybboxes[entity.id] || []).concat(_entitybboxes[entity.id + 'I'] || []);
 
-             // Store if walkthrough is completed..
-             let incomplete = utilArrayDifference(chapterFlow, progress);
-             if (!incomplete.length) {
-               corePreferences('walkthrough_completed', 'yes');
-             }
+               for (j = 0; j < toRemove.length; j++) {
+                 _rdrawn.remove(toRemove[j]);
 
-             curtain.remove();
-             navwrap.remove();
-             context.container().selectAll('.main-map .layer-background').style('opacity', opacity);
-             context.container().selectAll('button.sidebar-toggle').classed('disabled', false);
-             if (osm) { osm.toggle(true).reset().caches(caches); }
-             context.history().reset().merge(Object.values(baseEntities));
-             context.background().baseLayerSource(background);
-             overlays.forEach(d => context.background().toggleOverlayLayer(d));
-             if (history) { context.history().fromJSON(history, false); }
-             context.map().centerZoom(center, zoom);
-             window.location.replace(hash);
-             context.inIntro(false);
-           });
+                 _rskipped.remove(toRemove[j]);
+               }
+             }
+           } // Loop through all the entities to do some preprocessing
 
-           let navwrap = selection
-             .append('div')
-             .attr('class', 'intro-nav-wrap fillD');
 
-           navwrap
-             .append('svg')
-             .attr('class', 'intro-nav-wrap-logo')
-             .append('use')
-             .attr('xlink:href', '#iD-logo-walkthrough');
+           for (i = 0; i < entities.length; i++) {
+             entity = entities[i];
+             geometry = entity.geometry(graph); // Insert collision boxes around interesting points/vertices
 
-           let buttonwrap = navwrap
-             .append('div')
-             .attr('class', 'joined')
-             .selectAll('button.chapter');
+             if (geometry === 'point' || geometry === 'vertex' && isInterestingVertex(entity)) {
+               var hasDirections = entity.directions(graph, projection).length;
+               var markerPadding;
 
-           let buttons = buttonwrap
-             .data(chapters)
-             .enter()
-             .append('button')
-             .attr('class', (d, i) => `chapter chapter-${chapterFlow[i]}`)
-             .on('click', enterChapter);
+               if (!wireframe && geometry === 'point' && !(zoom >= 18 && hasDirections)) {
+                 renderNodeAs[entity.id] = 'point';
+                 markerPadding = 20; // extra y for marker height
+               } else {
+                 renderNodeAs[entity.id] = 'vertex';
+                 markerPadding = 0;
+               }
 
-           buttons
-             .append('span')
-             .text(d => _t(d.title));
+               var coord = projection(entity.loc);
+               var nodePadding = 10;
+               var bbox = {
+                 minX: coord[0] - nodePadding,
+                 minY: coord[1] - nodePadding - markerPadding,
+                 maxX: coord[0] + nodePadding,
+                 maxY: coord[1] + nodePadding
+               };
+               doInsert(bbox, entity.id + 'P');
+             } // From here on, treat vertices like points
 
-           buttons
-             .append('span')
-             .attr('class', 'status')
-             .call(svgIcon((_mainLocalizer.textDirection() === 'rtl' ? '#iD-icon-backward' : '#iD-icon-forward'), 'inline'));
 
-           enterChapter(chapters[0]);
+             if (geometry === 'vertex') {
+               geometry = 'point';
+             } // Determine which entities are label-able
 
 
-           function enterChapter(newChapter) {
-             if (_currChapter) { _currChapter.exit(); }
-             context.enter(modeBrowse(context));
+             var preset = geometry === 'area' && _mainPresetIndex.match(entity, graph);
+             var icon = preset && !shouldSkipIcon(preset) && preset.icon;
+             if (!icon && !utilDisplayName(entity)) continue;
 
-             _currChapter = newChapter;
-             _currChapter.enter();
+             for (k = 0; k < labelStack.length; k++) {
+               var matchGeom = labelStack[k][0];
+               var matchKey = labelStack[k][1];
+               var matchVal = labelStack[k][2];
+               var hasVal = entity.tags[matchKey];
 
-             buttons
-               .classed('next', false)
-               .classed('active', d => d.title === _currChapter.title);
+               if (geometry === matchGeom && hasVal && (matchVal === '*' || matchVal === hasVal)) {
+                 labelable[k].push(entity);
+                 break;
+               }
+             }
            }
-         }
 
+           var positions = {
+             point: [],
+             line: [],
+             area: []
+           };
+           var labelled = {
+             point: [],
+             line: [],
+             area: []
+           }; // Try and find a valid label for labellable entities
 
-         return intro;
-       }
+           for (k = 0; k < labelable.length; k++) {
+             var fontSize = labelStack[k][3];
 
-       function uiIssuesInfo(context) {
+             for (i = 0; i < labelable[k].length; i++) {
+               entity = labelable[k][i];
+               geometry = entity.geometry(graph);
+               var getName = geometry === 'line' ? utilDisplayNameForPath : utilDisplayName;
+               var name = getName(entity);
+               var width = name && textWidth(name, fontSize);
+               var p = null;
 
-           var warningsItem = {
-               id: 'warnings',
-               count: 0,
-               iconID: 'iD-icon-alert',
-               descriptionID: 'issues.warnings_and_errors'
-           };
+               if (geometry === 'point' || geometry === 'vertex') {
+                 // no point or vertex labels in wireframe mode
+                 // no vertex labels at low zooms (vertices have no icons)
+                 if (wireframe) continue;
+                 var renderAs = renderNodeAs[entity.id];
+                 if (renderAs === 'vertex' && zoom < 17) continue;
+                 p = getPointLabel(entity, width, fontSize, renderAs);
+               } else if (geometry === 'line') {
+                 p = getLineLabel(entity, width, fontSize);
+               } else if (geometry === 'area') {
+                 p = getAreaLabel(entity, width, fontSize);
+               }
+
+               if (p) {
+                 if (geometry === 'vertex') {
+                   geometry = 'point';
+                 } // treat vertex like point
 
-           var resolvedItem = {
-               id: 'resolved',
-               count: 0,
-               iconID: 'iD-icon-apply',
-               descriptionID: 'issues.user_resolved_issues'
-           };
 
-           function update(selection) {
+                 p.classes = geometry + ' tag-' + labelStack[k][1];
+                 positions[geometry].push(p);
+                 labelled[geometry].push(entity);
+               }
+             }
+           }
 
-               var shownItems = [];
+           function isInterestingVertex(entity) {
+             var selectedIDs = context.selectedIDs();
+             return entity.hasInterestingTags() || entity.isEndpoint(graph) || entity.isConnected(graph) || selectedIDs.indexOf(entity.id) !== -1 || graph.parentWays(entity).some(function (parent) {
+               return selectedIDs.indexOf(parent.id) !== -1;
+             });
+           }
 
-               var liveIssues = context.validator().getIssues({
-                   what: corePreferences('validate-what') || 'edited',
-                   where: corePreferences('validate-where') || 'all'
-               });
-               if (liveIssues.length) {
-                   warningsItem.count = liveIssues.length;
-                   shownItems.push(warningsItem);
-               }
+           function getPointLabel(entity, width, height, geometry) {
+             var y = geometry === 'point' ? -12 : 0;
+             var pointOffsets = {
+               ltr: [15, y, 'start'],
+               rtl: [-15, y, 'end']
+             };
+             var textDirection = _mainLocalizer.textDirection();
+             var coord = projection(entity.loc);
+             var textPadding = 2;
+             var offset = pointOffsets[textDirection];
+             var p = {
+               height: height,
+               width: width,
+               x: coord[0] + offset[0],
+               y: coord[1] + offset[1],
+               textAnchor: offset[2]
+             }; // insert a collision box for the text label..
+
+             var bbox;
+
+             if (textDirection === 'rtl') {
+               bbox = {
+                 minX: p.x - width - textPadding,
+                 minY: p.y - height / 2 - textPadding,
+                 maxX: p.x + textPadding,
+                 maxY: p.y + height / 2 + textPadding
+               };
+             } else {
+               bbox = {
+                 minX: p.x - textPadding,
+                 minY: p.y - height / 2 - textPadding,
+                 maxX: p.x + width + textPadding,
+                 maxY: p.y + height / 2 + textPadding
+               };
+             }
 
-               if (corePreferences('validate-what') === 'all') {
-                   var resolvedIssues = context.validator().getResolvedIssues();
-                   if (resolvedIssues.length) {
-                       resolvedItem.count = resolvedIssues.length;
-                       shownItems.push(resolvedItem);
-                   }
-               }
+             if (tryInsert([bbox], entity.id, true)) {
+               return p;
+             }
+           }
 
-               var chips = selection.selectAll('.chip')
-                   .data(shownItems, function(d) {
-                       return d.id;
-                   });
+           function getLineLabel(entity, width, height) {
+             var viewport = geoExtent(context.projection.clipExtent()).polygon();
+             var points = graph.childNodes(entity).map(function (node) {
+               return projection(node.loc);
+             });
+             var length = geoPathLength(points);
+             if (length < width + 20) return; // % along the line to attempt to place the label
 
-               chips.exit().remove();
+             var lineOffsets = [50, 45, 55, 40, 60, 35, 65, 30, 70, 25, 75, 20, 80, 15, 95, 10, 90, 5, 95];
+             var padding = 3;
 
-               var enter = chips.enter()
-                   .append('a')
-                   .attr('class', function(d) {
-                       return 'chip ' + d.id + '-count';
-                   })
-                   .attr('href', '#')
-                   .attr('tabindex', -1)
-                   .each(function(d) {
+             for (var i = 0; i < lineOffsets.length; i++) {
+               var offset = lineOffsets[i];
+               var middle = offset / 100 * length;
+               var start = middle - width / 2;
+               if (start < 0 || start + width > length) continue; // generate subpath and ignore paths that are invalid or don't cross viewport.
 
-                       var chipSelection = select(this);
+               var sub = subpath(points, start, start + width);
 
-                       var tooltipBehavior = uiTooltip()
-                           .placement('top')
-                           .title(_t(d.descriptionID));
+               if (!sub || !geoPolygonIntersectsPolygon(viewport, sub, true)) {
+                 continue;
+               }
 
-                       chipSelection
-                           .call(tooltipBehavior)
-                           .on('click', function() {
-                               event.preventDefault();
+               var isReverse = reverse(sub);
 
-                               tooltipBehavior.hide(select(this));
-                               // open the Issues pane
-                               context.ui().togglePanes(context.container().select('.map-panes .issues-pane'));
-                           });
+               if (isReverse) {
+                 sub = sub.reverse();
+               }
 
-                       chipSelection.call(svgIcon('#' + d.iconID));
+               var bboxes = [];
+               var boxsize = (height + 2) / 2;
 
-                   });
+               for (var j = 0; j < sub.length - 1; j++) {
+                 var a = sub[j];
+                 var b = sub[j + 1]; // split up the text into small collision boxes
 
-               enter.append('span')
-                   .attr('class', 'count');
+                 var num = Math.max(1, Math.floor(geoVecLength(a, b) / boxsize / 2));
 
-               enter.merge(chips)
-                   .selectAll('span.count')
-                   .text(function(d) {
-                       return d.count.toString();
+                 for (var box = 0; box < num; box++) {
+                   var p = geoVecInterp(a, b, box / num);
+                   var x0 = p[0] - boxsize - padding;
+                   var y0 = p[1] - boxsize - padding;
+                   var x1 = p[0] + boxsize + padding;
+                   var y1 = p[1] + boxsize + padding;
+                   bboxes.push({
+                     minX: Math.min(x0, x1),
+                     minY: Math.min(y0, y1),
+                     maxX: Math.max(x0, x1),
+                     maxY: Math.max(y0, y1)
                    });
-           }
-
+                 }
+               }
 
-           return function(selection) {
-               update(selection);
+               if (tryInsert(bboxes, entity.id, false)) {
+                 // accept this one
+                 return {
+                   'font-size': height + 2,
+                   lineString: lineString(sub),
+                   startOffset: offset + '%'
+                 };
+               }
+             }
 
-               context.validator().on('validated.infobox', function() {
-                   update(selection);
-               });
-           };
-       }
+             function reverse(p) {
+               var angle = Math.atan2(p[1][1] - p[0][1], p[1][0] - p[0][0]);
+               return !(p[0][0] < p[p.length - 1][0] && angle < Math.PI / 2 && angle > -Math.PI / 2);
+             }
 
-       // import { utilGetDimensions } from '../util/dimensions';
+             function lineString(points) {
+               return 'M' + points.join('L');
+             }
 
+             function subpath(points, from, to) {
+               var sofar = 0;
+               var start, end, i0, i1;
 
-       function uiMapInMap(context) {
+               for (var i = 0; i < points.length - 1; i++) {
+                 var a = points[i];
+                 var b = points[i + 1];
+                 var current = geoVecLength(a, b);
+                 var portion;
 
-           function mapInMap(selection) {
-               var backgroundLayer = rendererTileLayer(context);
-               var overlayLayers = {};
-               var projection = geoRawMercator();
-               var dataLayer = svgData(projection, context).showLabels(false);
-               var debugLayer = svgDebug(projection, context);
-               var zoom = d3_zoom()
-                   .scaleExtent([geoZoomToScale(0.5), geoZoomToScale(24)])
-                   .on('start', zoomStarted)
-                   .on('zoom', zoomed)
-                   .on('end', zoomEnded);
-
-               var wrap = select(null);
-               var tiles = select(null);
-               var viewport = select(null);
-
-               var _isTransformed = false;
-               var _isHidden = true;
-               var _skipEvents = false;
-               var _gesture = null;
-               var _zDiff = 6;    // by default, minimap renders at (main zoom - 6)
-               var _dMini;        // dimensions of minimap
-               var _cMini;        // center pixel of minimap
-               var _tStart;       // transform at start of gesture
-               var _tCurr;        // transform at most recent event
-               var _timeoutID;
-
-
-               function zoomStarted() {
-                   if (_skipEvents) return;
-                   _tStart = _tCurr = projection.transform();
-                   _gesture = null;
-               }
-
-
-               function zoomed() {
-                   if (_skipEvents) return;
-
-                   var x = event.transform.x;
-                   var y = event.transform.y;
-                   var k = event.transform.k;
-                   var isZooming = (k !== _tStart.k);
-                   var isPanning = (x !== _tStart.x || y !== _tStart.y);
-
-                   if (!isZooming && !isPanning) {
-                       return;  // no change
-                   }
+                 if (!start && sofar + current >= from) {
+                   portion = (from - sofar) / current;
+                   start = [a[0] + portion * (b[0] - a[0]), a[1] + portion * (b[1] - a[1])];
+                   i0 = i + 1;
+                 }
 
-                   // lock in either zooming or panning, don't allow both in minimap.
-                   if (!_gesture) {
-                       _gesture = isZooming ? 'zoom' : 'pan';
-                   }
+                 if (!end && sofar + current >= to) {
+                   portion = (to - sofar) / current;
+                   end = [a[0] + portion * (b[0] - a[0]), a[1] + portion * (b[1] - a[1])];
+                   i1 = i + 1;
+                 }
 
-                   var tMini = projection.transform();
-                   var tX, tY, scale;
+                 sofar += current;
+               }
 
-                   if (_gesture === 'zoom') {
-                       scale = k / tMini.k;
-                       tX = (_cMini[0] / scale - _cMini[0]) * scale;
-                       tY = (_cMini[1] / scale - _cMini[1]) * scale;
-                   } else {
-                       k = tMini.k;
-                       scale = 1;
-                       tX = x - tMini.x;
-                       tY = y - tMini.y;
-                   }
+               var result = points.slice(i0, i1);
+               result.unshift(start);
+               result.push(end);
+               return result;
+             }
+           }
 
-                   utilSetTransform(tiles, tX, tY, scale);
-                   utilSetTransform(viewport, 0, 0, scale);
-                   _isTransformed = true;
-                   _tCurr = identity$2.translate(x, y).scale(k);
+           function getAreaLabel(entity, width, height) {
+             var centroid = path.centroid(entity.asGeoJSON(graph, true));
+             var extent = entity.extent(graph);
+             var areaWidth = projection(extent[1])[0] - projection(extent[0])[0];
+             if (isNaN(centroid[0]) || areaWidth < 20) return;
+             var preset = _mainPresetIndex.match(entity, context.graph());
+             var picon = preset && preset.icon;
+             var iconSize = 17;
+             var padding = 2;
+             var p = {};
 
-                   var zMain = geoScaleToZoom(context.projection.scale());
-                   var zMini = geoScaleToZoom(k);
+             if (picon) {
+               // icon and label..
+               if (addIcon()) {
+                 addLabel(iconSize + padding);
+                 return p;
+               }
+             } else {
+               // label only..
+               if (addLabel(0)) {
+                 return p;
+               }
+             }
 
-                   _zDiff = zMain - zMini;
+             function addIcon() {
+               var iconX = centroid[0] - iconSize / 2;
+               var iconY = centroid[1] - iconSize / 2;
+               var bbox = {
+                 minX: iconX,
+                 minY: iconY,
+                 maxX: iconX + iconSize,
+                 maxY: iconY + iconSize
+               };
 
-                   queueRedraw();
+               if (tryInsert([bbox], entity.id + 'I', true)) {
+                 p.transform = 'translate(' + iconX + ',' + iconY + ')';
+                 return true;
                }
 
+               return false;
+             }
 
-               function zoomEnded() {
-                   if (_skipEvents) return;
-                   if (_gesture !== 'pan') return;
+             function addLabel(yOffset) {
+               if (width && areaWidth >= width + 20) {
+                 var labelX = centroid[0];
+                 var labelY = centroid[1] + yOffset;
+                 var bbox = {
+                   minX: labelX - width / 2 - padding,
+                   minY: labelY - height / 2 - padding,
+                   maxX: labelX + width / 2 + padding,
+                   maxY: labelY + height / 2 + padding
+                 };
 
-                   updateProjection();
-                   _gesture = null;
-                   context.map().center(projection.invert(_cMini));   // recenter main map..
+                 if (tryInsert([bbox], entity.id, true)) {
+                   p.x = labelX;
+                   p.y = labelY;
+                   p.textAnchor = 'middle';
+                   p.height = height;
+                   return true;
+                 }
                }
 
+               return false;
+             }
+           } // force insert a singular bounding box
+           // singular box only, no array, id better be unique
 
-               function updateProjection() {
-                   var loc = context.map().center();
-                   var tMain = context.projection.transform();
-                   var zMain = geoScaleToZoom(tMain.k);
-                   var zMini = Math.max(zMain - _zDiff, 0.5);
-                   var kMini = geoZoomToScale(zMini);
 
-                   projection
-                       .translate([tMain.x, tMain.y])
-                       .scale(kMini);
+           function doInsert(bbox, id) {
+             bbox.id = id;
+             var oldbox = _entitybboxes[id];
 
-                   var point = projection(loc);
-                   var mouse = (_gesture === 'pan') ? geoVecSubtract([_tCurr.x, _tCurr.y], [_tStart.x, _tStart.y]) : [0, 0];
-                   var xMini = _cMini[0] - point[0] + tMain.x + mouse[0];
-                   var yMini = _cMini[1] - point[1] + tMain.y + mouse[1];
+             if (oldbox) {
+               _rdrawn.remove(oldbox);
+             }
 
-                   projection
-                       .translate([xMini, yMini])
-                       .clipExtent([[0, 0], _dMini]);
+             _entitybboxes[id] = bbox;
 
-                   _tCurr = projection.transform();
+             _rdrawn.insert(bbox);
+           }
 
-                   if (_isTransformed) {
-                       utilSetTransform(tiles, 0, 0);
-                       utilSetTransform(viewport, 0, 0);
-                       _isTransformed = false;
-                   }
+           function tryInsert(bboxes, id, saveSkipped) {
+             var skipped = false;
 
-                   zoom
-                       .scaleExtent([geoZoomToScale(0.5), geoZoomToScale(zMain - 3)]);
+             for (var i = 0; i < bboxes.length; i++) {
+               var bbox = bboxes[i];
+               bbox.id = id; // Check that label is visible
 
-                   _skipEvents = true;
-                   wrap.call(zoom.transform, _tCurr);
-                   _skipEvents = false;
+               if (bbox.minX < 0 || bbox.minY < 0 || bbox.maxX > dimensions[0] || bbox.maxY > dimensions[1]) {
+                 skipped = true;
+                 break;
                }
 
+               if (_rdrawn.collides(bbox)) {
+                 skipped = true;
+                 break;
+               }
+             }
 
-               function redraw() {
-                   clearTimeout(_timeoutID);
-                   if (_isHidden) return;
-
-                   updateProjection();
-                   var zMini = geoScaleToZoom(projection.scale());
+             _entitybboxes[id] = bboxes;
 
-                   // setup tile container
-                   tiles = wrap
-                       .selectAll('.map-in-map-tiles')
-                       .data([0]);
+             if (skipped) {
+               if (saveSkipped) {
+                 _rskipped.load(bboxes);
+               }
+             } else {
+               _rdrawn.load(bboxes);
+             }
 
-                   tiles = tiles.enter()
-                       .append('div')
-                       .attr('class', 'map-in-map-tiles')
-                       .merge(tiles);
+             return !skipped;
+           }
 
-                   // redraw background
-                   backgroundLayer
-                       .source(context.background().baseLayerSource())
-                       .projection(projection)
-                       .dimensions(_dMini);
+           var layer = selection.selectAll('.layer-osm.labels');
+           layer.selectAll('.labels-group').data(['halo', 'label', 'debug']).enter().append('g').attr('class', function (d) {
+             return 'labels-group ' + d;
+           });
+           var halo = layer.selectAll('.labels-group.halo');
+           var label = layer.selectAll('.labels-group.label');
+           var debug = layer.selectAll('.labels-group.debug'); // points
 
-                   var background = tiles
-                       .selectAll('.map-in-map-background')
-                       .data([0]);
+           drawPointLabels(label, labelled.point, filter, 'pointlabel', positions.point);
+           drawPointLabels(halo, labelled.point, filter, 'pointlabel-halo', positions.point); // lines
 
-                   background.enter()
-                       .append('div')
-                       .attr('class', 'map-in-map-background')
-                       .merge(background)
-                       .call(backgroundLayer);
+           drawLinePaths(layer, labelled.line, filter, '', positions.line);
+           drawLineLabels(label, labelled.line, filter, 'linelabel', positions.line);
+           drawLineLabels(halo, labelled.line, filter, 'linelabel-halo', positions.line); // areas
 
+           drawAreaLabels(label, labelled.area, filter, 'arealabel', positions.area);
+           drawAreaLabels(halo, labelled.area, filter, 'arealabel-halo', positions.area);
+           drawAreaIcons(label, labelled.area, filter, 'areaicon', positions.area);
+           drawAreaIcons(halo, labelled.area, filter, 'areaicon-halo', positions.area); // debug
 
-                   // redraw overlay
-                   var overlaySources = context.background().overlayLayerSources();
-                   var activeOverlayLayers = [];
-                   for (var i = 0; i < overlaySources.length; i++) {
-                       if (overlaySources[i].validZoom(zMini)) {
-                           if (!overlayLayers[i]) overlayLayers[i] = rendererTileLayer(context);
-                           activeOverlayLayers.push(overlayLayers[i]
-                               .source(overlaySources[i])
-                               .projection(projection)
-                               .dimensions(_dMini));
-                       }
-                   }
+           drawCollisionBoxes(debug, _rskipped, 'debug-skipped');
+           drawCollisionBoxes(debug, _rdrawn, 'debug-drawn');
+           layer.call(filterLabels);
+         }
 
-                   var overlay = tiles
-                       .selectAll('.map-in-map-overlay')
-                       .data([0]);
+         function filterLabels(selection) {
+           var drawLayer = selection.selectAll('.layer-osm.labels');
+           var layers = drawLayer.selectAll('.labels-group.halo, .labels-group.label');
+           layers.selectAll('.nolabel').classed('nolabel', false);
+           var mouse = context.map().mouse();
+           var graph = context.graph();
+           var selectedIDs = context.selectedIDs();
+           var ids = [];
+           var pad, bbox; // hide labels near the mouse
+
+           if (mouse) {
+             pad = 20;
+             bbox = {
+               minX: mouse[0] - pad,
+               minY: mouse[1] - pad,
+               maxX: mouse[0] + pad,
+               maxY: mouse[1] + pad
+             };
 
-                   overlay = overlay.enter()
-                       .append('div')
-                       .attr('class', 'map-in-map-overlay')
-                       .merge(overlay);
+             var nearMouse = _rdrawn.search(bbox).map(function (entity) {
+               return entity.id;
+             });
 
+             ids.push.apply(ids, nearMouse);
+           } // hide labels on selected nodes (they look weird when dragging / haloed)
 
-                   var overlays = overlay
-                       .selectAll('div')
-                       .data(activeOverlayLayers, function(d) { return d.source().name(); });
 
-                   overlays.exit()
-                       .remove();
+           for (var i = 0; i < selectedIDs.length; i++) {
+             var entity = graph.hasEntity(selectedIDs[i]);
 
-                   overlays = overlays.enter()
-                       .append('div')
-                       .merge(overlays)
-                       .each(function(layer) { select(this).call(layer); });
+             if (entity && entity.type === 'node') {
+               ids.push(selectedIDs[i]);
+             }
+           }
 
+           layers.selectAll(utilEntitySelector(ids)).classed('nolabel', true); // draw the mouse bbox if debugging is on..
 
-                   var dataLayers = tiles
-                       .selectAll('.map-in-map-data')
-                       .data([0]);
+           var debug = selection.selectAll('.labels-group.debug');
+           var gj = [];
 
-                   dataLayers.exit()
-                       .remove();
+           if (context.getDebug('collision')) {
+             gj = bbox ? [{
+               type: 'Polygon',
+               coordinates: [[[bbox.minX, bbox.minY], [bbox.maxX, bbox.minY], [bbox.maxX, bbox.maxY], [bbox.minX, bbox.maxY], [bbox.minX, bbox.minY]]]
+             }] : [];
+           }
 
-                   dataLayers = dataLayers.enter()
-                       .append('svg')
-                       .attr('class', 'map-in-map-data')
-                       .merge(dataLayers)
-                       .call(dataLayer)
-                       .call(debugLayer);
+           var box = debug.selectAll('.debug-mouse').data(gj); // exit
 
+           box.exit().remove(); // enter/update
 
-                   // redraw viewport bounding box
-                   if (_gesture !== 'pan') {
-                       var getPath = d3_geoPath(projection);
-                       var bbox = { type: 'Polygon', coordinates: [context.map().extent().polygon()] };
+           box.enter().append('path').attr('class', 'debug debug-mouse yellow').merge(box).attr('d', d3_geoPath());
+         }
 
-                       viewport = wrap.selectAll('.map-in-map-viewport')
-                           .data([0]);
+         var throttleFilterLabels = throttle(filterLabels, 100);
 
-                       viewport = viewport.enter()
-                           .append('svg')
-                           .attr('class', 'map-in-map-viewport')
-                           .merge(viewport);
+         drawLabels.observe = function (selection) {
+           var listener = function listener() {
+             throttleFilterLabels(selection);
+           };
 
+           selection.on('mousemove.hidelabels', listener);
+           context.on('enter.hidelabels', listener);
+         };
 
-                       var path = viewport.selectAll('.map-in-map-bbox')
-                           .data([bbox]);
+         drawLabels.off = function (selection) {
+           throttleFilterLabels.cancel();
+           selection.on('mousemove.hidelabels', null);
+           context.on('enter.hidelabels', null);
+         };
 
-                       path.enter()
-                           .append('path')
-                           .attr('class', 'map-in-map-bbox')
-                           .merge(path)
-                           .attr('d', getPath)
-                           .classed('thick', function(d) { return getPath.area(d) < 30; });
-                   }
-               }
+         return drawLabels;
+       }
 
+       var _layerEnabled$1 = false;
 
-               function queueRedraw() {
-                   clearTimeout(_timeoutID);
-                   _timeoutID = setTimeout(function() { redraw(); }, 750);
-               }
+       var _qaService$1;
 
+       function svgImproveOSM(projection, context, dispatch) {
+         var throttledRedraw = throttle(function () {
+           return dispatch.call('change');
+         }, 1000);
 
-               function toggle() {
-                   if (event) event.preventDefault();
+         var minZoom = 12;
+         var touchLayer = select(null);
+         var drawLayer = select(null);
+         var layerVisible = false;
 
-                   _isHidden = !_isHidden;
+         function markerPath(selection, klass) {
+           selection.attr('class', klass).attr('transform', 'translate(-10, -28)').attr('points', '16,3 4,3 1,6 1,17 4,20 7,20 10,27 13,20 16,20 19,17.033 19,6');
+         } // Loosely-coupled improveOSM service for fetching issues
 
-                   context.container().select('.minimap-toggle-item')
-                       .classed('active', !_isHidden)
-                       .select('input')
-                       .property('checked', !_isHidden);
 
-                   if (_isHidden) {
-                       wrap
-                           .style('display', 'block')
-                           .style('opacity', '1')
-                           .transition()
-                           .duration(200)
-                           .style('opacity', '0')
-                           .on('end', function() {
-                               selection.selectAll('.map-in-map')
-                                   .style('display', 'none');
-                           });
-                   } else {
-                       wrap
-                           .style('display', 'block')
-                           .style('opacity', '0')
-                           .transition()
-                           .duration(200)
-                           .style('opacity', '1')
-                           .on('end', function() {
-                               redraw();
-                           });
-                   }
-               }
+         function getService() {
+           if (services.improveOSM && !_qaService$1) {
+             _qaService$1 = services.improveOSM;
 
+             _qaService$1.on('loaded', throttledRedraw);
+           } else if (!services.improveOSM && _qaService$1) {
+             _qaService$1 = null;
+           }
 
-               uiMapInMap.toggle = toggle;
+           return _qaService$1;
+         } // Show the markers
 
-               wrap = selection.selectAll('.map-in-map')
-                   .data([0]);
 
-               wrap = wrap.enter()
-                   .append('div')
-                   .attr('class', 'map-in-map')
-                   .style('display', (_isHidden ? 'none' : 'block'))
-                   .call(zoom)
-                   .on('dblclick.zoom', null)
-                   .merge(wrap);
-
-               // reflow warning: Hardcode dimensions - currently can't resize it anyway..
-               _dMini = [200,150]; //utilGetDimensions(wrap);
-               _cMini = geoVecScale(_dMini, 0.5);
-
-               context.map()
-                   .on('drawn.map-in-map', function(drawn) {
-                       if (drawn.full === true) {
-                           redraw();
-                       }
-                   });
+         function editOn() {
+           if (!layerVisible) {
+             layerVisible = true;
+             drawLayer.style('display', 'block');
+           }
+         } // Immediately remove the markers and their touch targets
 
-               redraw();
 
-               context.keybinding()
-                   .on(_t('background.minimap.key'), toggle);
+         function editOff() {
+           if (layerVisible) {
+             layerVisible = false;
+             drawLayer.style('display', 'none');
+             drawLayer.selectAll('.qaItem.improveOSM').remove();
+             touchLayer.selectAll('.qaItem.improveOSM').remove();
            }
+         } // Enable the layer.  This shows the markers and transitions them to visible.
 
-           return mapInMap;
-       }
 
-       function uiNotice(context) {
+         function layerOn() {
+           editOn();
+           drawLayer.style('opacity', 0).transition().duration(250).style('opacity', 1).on('end interrupt', function () {
+             return dispatch.call('change');
+           });
+         } // Disable the layer.  This transitions the layer invisible and then hides the markers.
 
-           return function(selection) {
-               var div = selection
-                   .append('div')
-                   .attr('class', 'notice');
-
-               var button = div
-                   .append('button')
-                   .attr('class', 'zoom-to notice fillD')
-                   .on('click', function() {
-                       context.map().zoomEase(context.minEditableZoom());
-                   })
-                   .on('wheel', function() {   // let wheel events pass through #4482
-                       var e2 = new WheelEvent(event.type, event);
-                       context.surface().node().dispatchEvent(e2);
-                   });
 
-               button
-                   .call(svgIcon('#iD-icon-plus', 'pre-text'))
-                   .append('span')
-                   .attr('class', 'label')
-                   .text(_t('zoom_in_edit'));
+         function layerOff() {
+           throttledRedraw.cancel();
+           drawLayer.interrupt();
+           touchLayer.selectAll('.qaItem.improveOSM').remove();
+           drawLayer.transition().duration(250).style('opacity', 0).on('end interrupt', function () {
+             editOff();
+             dispatch.call('change');
+           });
+         } // Update the issue markers
 
 
-               function disableTooHigh() {
-                   var canEdit = context.map().zoom() >= context.minEditableZoom();
-                   div.style('display', canEdit ? 'none' : 'block');
-               }
+         function updateMarkers() {
+           if (!layerVisible || !_layerEnabled$1) return;
+           var service = getService();
+           var selectedID = context.selectedErrorID();
+           var data = service ? service.getItems(projection) : [];
+           var getTransform = svgPointTransform(projection); // Draw markers..
 
-               context.map()
-                   .on('move.notice', debounce(disableTooHigh, 500));
+           var markers = drawLayer.selectAll('.qaItem.improveOSM').data(data, function (d) {
+             return d.id;
+           }); // exit
 
-               disableTooHigh();
-           };
-       }
+           markers.exit().remove(); // enter
 
-       function uiPhotoviewer(context) {
+           var markersEnter = markers.enter().append('g').attr('class', function (d) {
+             return "qaItem ".concat(d.service, " itemId-").concat(d.id, " itemType-").concat(d.itemType);
+           });
+           markersEnter.append('polygon').call(markerPath, 'shadow');
+           markersEnter.append('ellipse').attr('cx', 0).attr('cy', 0).attr('rx', 4.5).attr('ry', 2).attr('class', 'stroke');
+           markersEnter.append('polygon').attr('fill', 'currentColor').call(markerPath, 'qaItem-fill');
+           markersEnter.append('use').attr('transform', 'translate(-6.5, -23)').attr('class', 'icon-annotation').attr('width', '13px').attr('height', '13px').attr('xlink:href', function (d) {
+             var picon = d.icon;
 
-           var dispatch$1 = dispatch('resize');
+             if (!picon) {
+               return '';
+             } else {
+               var isMaki = /^maki-/.test(picon);
+               return "#".concat(picon).concat(isMaki ? '-11' : '');
+             }
+           }); // update
 
-           var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
+           markers.merge(markersEnter).sort(sortY).classed('selected', function (d) {
+             return d.id === selectedID;
+           }).attr('transform', getTransform); // Draw targets..
 
-           function photoviewer(selection) {
-               selection
-                   .append('button')
-                   .attr('class', 'thumb-hide')
-                   .on('click', function () {
-                       if (services.streetside) { services.streetside.hideViewer(context); }
-                       if (services.mapillary) { services.mapillary.hideViewer(context); }
-                       if (services.openstreetcam) { services.openstreetcam.hideViewer(context); }
-                   })
-                   .append('div')
-                   .call(svgIcon('#iD-icon-close'));
-
-               function preventDefault() {
-                   event.preventDefault();
-               }
-
-               selection
-                   .append('button')
-                   .attr('class', 'resize-handle-xy')
-                   .on('touchstart touchdown touchend', preventDefault)
-                   .on(
-                       _pointerPrefix + 'down',
-                       buildResizeListener(selection, 'resize', dispatch$1, { resizeOnX: true, resizeOnY: true })
-                   );
-
-               selection
-                   .append('button')
-                   .attr('class', 'resize-handle-x')
-                   .on('touchstart touchdown touchend', preventDefault)
-                   .on(
-                       _pointerPrefix + 'down',
-                       buildResizeListener(selection, 'resize', dispatch$1, { resizeOnX: true })
-                   );
-
-               selection
-                   .append('button')
-                   .attr('class', 'resize-handle-y')
-                   .on('touchstart touchdown touchend', preventDefault)
-                   .on(
-                       _pointerPrefix + 'down',
-                       buildResizeListener(selection, 'resize', dispatch$1, { resizeOnY: true })
-                   );
-
-               services.streetside.loadViewer(context);
-               services.mapillary.loadViewer(context);
-               services.openstreetcam.loadViewer(context);
-
-               function buildResizeListener(target, eventName, dispatch, options) {
-
-                   var resizeOnX = !!options.resizeOnX;
-                   var resizeOnY = !!options.resizeOnY;
-                   var minHeight = options.minHeight || 240;
-                   var minWidth = options.minWidth || 320;
-                   var pointerId;
-                   var startX;
-                   var startY;
-                   var startWidth;
-                   var startHeight;
-
-                   function startResize() {
-                       if (pointerId !== (event.pointerId || 'mouse')) return;
-
-                       event.preventDefault();
-                       event.stopPropagation();
-
-                       var mapSize = context.map().dimensions();
-
-                       if (resizeOnX) {
-                           var maxWidth = mapSize[0];
-                           var newWidth = clamp((startWidth + event.clientX - startX), minWidth, maxWidth);
-                           target.style('width', newWidth + 'px');
-                       }
+           if (touchLayer.empty()) return;
+           var fillClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
+           var targets = touchLayer.selectAll('.qaItem.improveOSM').data(data, function (d) {
+             return d.id;
+           }); // exit
 
-                       if (resizeOnY) {
-                           var maxHeight = mapSize[1] - 90;  // preserve space at top/bottom of map
-                           var newHeight = clamp((startHeight + startY - event.clientY), minHeight, maxHeight);
-                           target.style('height', newHeight + 'px');
-                       }
+           targets.exit().remove(); // enter/update
 
-                       dispatch.call(eventName, target, utilGetDimensions(target, true));
-                   }
+           targets.enter().append('rect').attr('width', '20px').attr('height', '30px').attr('x', '-10px').attr('y', '-28px').merge(targets).sort(sortY).attr('class', function (d) {
+             return "qaItem ".concat(d.service, " target ").concat(fillClass, " itemId-").concat(d.id);
+           }).attr('transform', getTransform);
 
-                   function clamp(num, min, max) {
-                       return Math.max(min, Math.min(num, max));
-                   }
+           function sortY(a, b) {
+             return a.id === selectedID ? 1 : b.id === selectedID ? -1 : b.loc[1] - a.loc[1];
+           }
+         } // Draw the ImproveOSM layer and schedule loading issues and updating markers.
 
-                   function stopResize() {
-                       if (pointerId !== (event.pointerId || 'mouse')) return;
 
-                       event.preventDefault();
-                       event.stopPropagation();
+         function drawImproveOSM(selection) {
+           var service = getService();
+           var surface = context.surface();
 
-                       // remove all the listeners we added
-                       select(window)
-                           .on('.' + eventName, null);
-                   }
+           if (surface && !surface.empty()) {
+             touchLayer = surface.selectAll('.data-layer.touch .layer-touch.markers');
+           }
+
+           drawLayer = selection.selectAll('.layer-improveOSM').data(service ? [0] : []);
+           drawLayer.exit().remove();
+           drawLayer = drawLayer.enter().append('g').attr('class', 'layer-improveOSM').style('display', _layerEnabled$1 ? 'block' : 'none').merge(drawLayer);
 
-                   return function initResize() {
-                       event.preventDefault();
-                       event.stopPropagation();
+           if (_layerEnabled$1) {
+             if (service && ~~context.map().zoom() >= minZoom) {
+               editOn();
+               service.loadIssues(projection);
+               updateMarkers();
+             } else {
+               editOff();
+             }
+           }
+         } // Toggles the layer on and off
 
-                       pointerId = event.pointerId || 'mouse';
 
-                       startX = event.clientX;
-                       startY = event.clientY;
-                       var targetRect = target.node().getBoundingClientRect();
-                       startWidth = targetRect.width;
-                       startHeight = targetRect.height;
+         drawImproveOSM.enabled = function (val) {
+           if (!arguments.length) return _layerEnabled$1;
+           _layerEnabled$1 = val;
 
-                       select(window)
-                           .on(_pointerPrefix + 'move.' + eventName, startResize, false)
-                           .on(_pointerPrefix + 'up.' + eventName, stopResize, false);
+           if (_layerEnabled$1) {
+             layerOn();
+           } else {
+             layerOff();
 
-                       if (_pointerPrefix === 'pointer') {
-                           select(window)
-                               .on('pointercancel.' + eventName, stopResize, false);
-                       }
-                   };
-               }
+             if (context.selectedErrorID()) {
+               context.enter(modeBrowse(context));
+             }
            }
 
-           photoviewer.onMapResize = function() {
-               var photoviewer = context.container().select('.photoviewer');
-               var content = context.container().select('.main-content');
-               var mapDimensions = utilGetDimensions(content, true);
-               // shrink photo viewer if it is too big
-               // (-90 preserves space at top and bottom of map used by menus)
-               var photoDimensions = utilGetDimensions(photoviewer, true);
-               if (photoDimensions[0] > mapDimensions[0] || photoDimensions[1] > (mapDimensions[1] - 90)) {
-                   var setPhotoDimensions = [
-                       Math.min(photoDimensions[0], mapDimensions[0]),
-                       Math.min(photoDimensions[1], mapDimensions[1] - 90),
-                   ];
-
-                   photoviewer
-                       .style('width', setPhotoDimensions[0] + 'px')
-                       .style('height', setPhotoDimensions[1] + 'px');
+           dispatch.call('change');
+           return this;
+         };
 
-                   dispatch$1.call('resize', photoviewer, setPhotoDimensions);
-               }
-           };
+         drawImproveOSM.supported = function () {
+           return !!getService();
+         };
 
-           return utilRebind(photoviewer, dispatch$1, 'on');
+         return drawImproveOSM;
        }
 
-       function uiRestore(context) {
-         return function(selection) {
-           if (!context.history().hasRestorableChanges()) return;
+       var _layerEnabled$2 = false;
 
-           let modalSelection = uiModal(selection, true);
+       var _qaService$2;
 
-           modalSelection.select('.modal')
-             .attr('class', 'modal fillL');
+       function svgOsmose(projection, context, dispatch) {
+         var throttledRedraw = throttle(function () {
+           return dispatch.call('change');
+         }, 1000);
 
-           let introModal = modalSelection.select('.content');
+         var minZoom = 12;
+         var touchLayer = select(null);
+         var drawLayer = select(null);
+         var layerVisible = false;
 
-           introModal
-             .append('div')
-             .attr('class', 'modal-section')
-             .append('h3')
-             .text(_t('restore.heading'));
+         function markerPath(selection, klass) {
+           selection.attr('class', klass).attr('transform', 'translate(-10, -28)').attr('points', '16,3 4,3 1,6 1,17 4,20 7,20 10,27 13,20 16,20 19,17.033 19,6');
+         } // Loosely-coupled osmose service for fetching issues
 
-           introModal
-             .append('div')
-             .attr('class','modal-section')
-             .append('p')
-             .text(_t('restore.description'));
 
-           let buttonWrap = introModal
-             .append('div')
-             .attr('class', 'modal-actions');
+         function getService() {
+           if (services.osmose && !_qaService$2) {
+             _qaService$2 = services.osmose;
 
-           let restore = buttonWrap
-             .append('button')
-             .attr('class', 'restore')
-             .on('click', () => {
-               context.history().restore();
-               modalSelection.remove();
-             });
+             _qaService$2.on('loaded', throttledRedraw);
+           } else if (!services.osmose && _qaService$2) {
+             _qaService$2 = null;
+           }
 
-           restore
-             .append('svg')
-             .attr('class', 'logo logo-restore')
-             .append('use')
-             .attr('xlink:href', '#iD-logo-restore');
+           return _qaService$2;
+         } // Show the markers
 
-           restore
-             .append('div')
-             .text(_t('restore.restore'));
 
-           let reset = buttonWrap
-             .append('button')
-             .attr('class', 'reset')
-             .on('click', () => {
-               context.history().clearSaved();
-               modalSelection.remove();
-             });
+         function editOn() {
+           if (!layerVisible) {
+             layerVisible = true;
+             drawLayer.style('display', 'block');
+           }
+         } // Immediately remove the markers and their touch targets
 
-           reset
-             .append('svg')
-             .attr('class', 'logo logo-reset')
-             .append('use')
-             .attr('xlink:href', '#iD-logo-reset');
 
-           reset
-             .append('div')
-             .text(_t('restore.reset'));
+         function editOff() {
+           if (layerVisible) {
+             layerVisible = false;
+             drawLayer.style('display', 'none');
+             drawLayer.selectAll('.qaItem.osmose').remove();
+             touchLayer.selectAll('.qaItem.osmose').remove();
+           }
+         } // Enable the layer.  This shows the markers and transitions them to visible.
 
-           restore.node().focus();
-         };
-       }
 
-       function uiScale(context) {
-           var projection = context.projection,
-               isImperial = !_mainLocalizer.usesMetric(),
-               maxLength = 180,
-               tickHeight = 8;
+         function layerOn() {
+           editOn();
+           drawLayer.style('opacity', 0).transition().duration(250).style('opacity', 1).on('end interrupt', function () {
+             return dispatch.call('change');
+           });
+         } // Disable the layer.  This transitions the layer invisible and then hides the markers.
 
 
-           function scaleDefs(loc1, loc2) {
-               var lat = (loc2[1] + loc1[1]) / 2,
-                   conversion = (isImperial ? 3.28084 : 1),
-                   dist = geoLonToMeters(loc2[0] - loc1[0], lat) * conversion,
-                   scale = { dist: 0, px: 0, text: '' },
-                   buckets, i, val, dLon;
+         function layerOff() {
+           throttledRedraw.cancel();
+           drawLayer.interrupt();
+           touchLayer.selectAll('.qaItem.osmose').remove();
+           drawLayer.transition().duration(250).style('opacity', 0).on('end interrupt', function () {
+             editOff();
+             dispatch.call('change');
+           });
+         } // Update the issue markers
 
-               if (isImperial) {
-                   buckets = [5280000, 528000, 52800, 5280, 500, 50, 5, 1];
-               } else {
-                   buckets = [5000000, 500000, 50000, 5000, 500, 50, 5, 1];
-               }
 
-               // determine a user-friendly endpoint for the scale
-               for (i = 0; i < buckets.length; i++) {
-                   val = buckets[i];
-                   if (dist >= val) {
-                       scale.dist = Math.floor(dist / val) * val;
-                       break;
-                   } else {
-                       scale.dist = +dist.toFixed(2);
-                   }
-               }
+         function updateMarkers() {
+           if (!layerVisible || !_layerEnabled$2) return;
+           var service = getService();
+           var selectedID = context.selectedErrorID();
+           var data = service ? service.getItems(projection) : [];
+           var getTransform = svgPointTransform(projection); // Draw markers..
 
-               dLon = geoMetersToLon(scale.dist / conversion, lat);
-               scale.px = Math.round(projection([loc1[0] + dLon, loc1[1]])[0]);
+           var markers = drawLayer.selectAll('.qaItem.osmose').data(data, function (d) {
+             return d.id;
+           }); // exit
 
-               scale.text = displayLength(scale.dist / conversion, isImperial);
+           markers.exit().remove(); // enter
 
-               return scale;
-           }
+           var markersEnter = markers.enter().append('g').attr('class', function (d) {
+             return "qaItem ".concat(d.service, " itemId-").concat(d.id, " itemType-").concat(d.itemType);
+           });
+           markersEnter.append('polygon').call(markerPath, 'shadow');
+           markersEnter.append('ellipse').attr('cx', 0).attr('cy', 0).attr('rx', 4.5).attr('ry', 2).attr('class', 'stroke');
+           markersEnter.append('polygon').attr('fill', function (d) {
+             return service.getColor(d.item);
+           }).call(markerPath, 'qaItem-fill');
+           markersEnter.append('use').attr('transform', 'translate(-6.5, -23)').attr('class', 'icon-annotation').attr('width', '13px').attr('height', '13px').attr('xlink:href', function (d) {
+             var picon = d.icon;
+
+             if (!picon) {
+               return '';
+             } else {
+               var isMaki = /^maki-/.test(picon);
+               return "#".concat(picon).concat(isMaki ? '-11' : '');
+             }
+           }); // update
 
+           markers.merge(markersEnter).sort(sortY).classed('selected', function (d) {
+             return d.id === selectedID;
+           }).attr('transform', getTransform); // Draw targets..
 
-           function update(selection) {
-               // choose loc1, loc2 along bottom of viewport (near where the scale will be drawn)
-               var dims = context.map().dimensions(),
-                   loc1 = projection.invert([0, dims[1]]),
-                   loc2 = projection.invert([maxLength, dims[1]]),
-                   scale = scaleDefs(loc1, loc2);
+           if (touchLayer.empty()) return;
+           var fillClass = context.getDebug('target') ? 'pink' : 'nocolor';
+           var targets = touchLayer.selectAll('.qaItem.osmose').data(data, function (d) {
+             return d.id;
+           }); // exit
 
-               selection.select('.scale-path')
-                   .attr('d', 'M0.5,0.5v' + tickHeight + 'h' + scale.px + 'v-' + tickHeight);
+           targets.exit().remove(); // enter/update
 
-               selection.select('.scale-textgroup')
-                   .attr('transform', 'translate(' + (scale.px + 8) + ',' + tickHeight + ')');
+           targets.enter().append('rect').attr('width', '20px').attr('height', '30px').attr('x', '-10px').attr('y', '-28px').merge(targets).sort(sortY).attr('class', function (d) {
+             return "qaItem ".concat(d.service, " target ").concat(fillClass, " itemId-").concat(d.id);
+           }).attr('transform', getTransform);
 
-               selection.select('.scale-text')
-                   .text(scale.text);
+           function sortY(a, b) {
+             return a.id === selectedID ? 1 : b.id === selectedID ? -1 : b.loc[1] - a.loc[1];
            }
+         } // Draw the Osmose layer and schedule loading issues and updating markers.
 
 
-           return function(selection) {
-               function switchUnits() {
-                   isImperial = !isImperial;
-                   selection.call(update);
-               }
-
-               var scalegroup = selection.append('svg')
-                   .attr('class', 'scale')
-                   .on('click', switchUnits)
-                   .append('g')
-                   .attr('transform', 'translate(10,11)');
-
-               scalegroup
-                   .append('path')
-                   .attr('class', 'scale-path');
+         function drawOsmose(selection) {
+           var service = getService();
+           var surface = context.surface();
 
-               scalegroup
-                   .append('g')
-                   .attr('class', 'scale-textgroup')
-                   .append('text')
-                   .attr('class', 'scale-text');
+           if (surface && !surface.empty()) {
+             touchLayer = surface.selectAll('.data-layer.touch .layer-touch.markers');
+           }
 
-               selection.call(update);
+           drawLayer = selection.selectAll('.layer-osmose').data(service ? [0] : []);
+           drawLayer.exit().remove();
+           drawLayer = drawLayer.enter().append('g').attr('class', 'layer-osmose').style('display', _layerEnabled$2 ? 'block' : 'none').merge(drawLayer);
 
-               context.map().on('move.scale', function() {
-                   update(selection);
-               });
-           };
-       }
+           if (_layerEnabled$2) {
+             if (service && ~~context.map().zoom() >= minZoom) {
+               editOn();
+               service.loadIssues(projection);
+               updateMarkers();
+             } else {
+               editOff();
+             }
+           }
+         } // Toggles the layer on and off
 
-       function uiShortcuts(context) {
-           var detected = utilDetect();
-           var _activeTab = 0;
-           var _modalSelection;
-           var _selection = select(null);
 
+         drawOsmose.enabled = function (val) {
+           if (!arguments.length) return _layerEnabled$2;
+           _layerEnabled$2 = val;
 
-           context.keybinding()
-               .on([_t('shortcuts.toggle.key'), '?'], function () {
-                   if (context.container().selectAll('.modal-shortcuts').size()) {  // already showing
-                       if (_modalSelection) {
-                           _modalSelection.close();
-                           _modalSelection = null;
-                       }
-                   } else {
-                       _modalSelection = uiModal(_selection);
-                       _modalSelection.call(shortcutsModal);
-                   }
-               });
+           if (_layerEnabled$2) {
+             // Strings supplied by Osmose fetched before showing layer for first time
+             // NOTE: Currently no way to change locale in iD at runtime, would need to re-call this method if that's ever implemented
+             // Also, If layer is toggled quickly multiple requests are sent
+             getService().loadStrings().then(layerOn)["catch"](function (err) {
+               console.log(err); // eslint-disable-line no-console
+             });
+           } else {
+             layerOff();
 
+             if (context.selectedErrorID()) {
+               context.enter(modeBrowse(context));
+             }
+           }
 
-           function shortcutsModal(_modalSelection) {
-               _modalSelection.select('.modal')
-                   .classed('modal-shortcuts', true);
+           dispatch.call('change');
+           return this;
+         };
 
-               var content = _modalSelection.select('.content');
+         drawOsmose.supported = function () {
+           return !!getService();
+         };
 
-               content
-                   .append('div')
-                   .attr('class', 'modal-section')
-                   .append('h3')
-                   .text(_t('shortcuts.title'));
+         return drawOsmose;
+       }
 
-               _mainFileFetcher.get('shortcuts')
-                   .then(function(data) { content.call(render, data); })
-                   .catch(function() { /* ignore */ });
-           }
+       function svgStreetside(projection, context, dispatch) {
+         var throttledRedraw = throttle(function () {
+           dispatch.call('change');
+         }, 1000);
 
+         var minZoom = 14;
+         var minMarkerZoom = 16;
+         var minViewfieldZoom = 18;
+         var layer = select(null);
+         var _viewerYaw = 0;
+         var _selectedSequence = null;
 
-           function render(selection, dataShortcuts) {
-               var wrapper = selection
-                   .selectAll('.wrapper')
-                   .data([0]);
+         var _streetside;
+         /**
+          * init().
+          */
 
-               var wrapperEnter = wrapper
-                   .enter()
-                   .append('div')
-                   .attr('class', 'wrapper modal-section');
 
-               var tabsBar = wrapperEnter
-                   .append('div')
-                   .attr('class', 'tabs-bar');
+         function init() {
+           if (svgStreetside.initialized) return; // run once
 
-               var shortcutsList = wrapperEnter
-                   .append('div')
-                   .attr('class', 'shortcuts-list');
+           svgStreetside.enabled = false;
+           svgStreetside.initialized = true;
+         }
+         /**
+          * getService().
+          */
 
-               wrapper = wrapper.merge(wrapperEnter);
 
-               var tabs = tabsBar
-                   .selectAll('.tab')
-                   .data(dataShortcuts);
+         function getService() {
+           if (services.streetside && !_streetside) {
+             _streetside = services.streetside;
 
-               var tabsEnter = tabs
-                   .enter()
-                   .append('div')
-                   .attr('class', 'tab')
-                   .on('click', function (d, i) {
-                       _activeTab = i;
-                       render(selection, dataShortcuts);
-                   });
+             _streetside.event.on('viewerChanged.svgStreetside', viewerChanged).on('loadedImages.svgStreetside', throttledRedraw);
+           } else if (!services.streetside && _streetside) {
+             _streetside = null;
+           }
 
-               tabsEnter
-                   .append('span')
-                   .text(function (d) { return _t(d.text); });
+           return _streetside;
+         }
+         /**
+          * showLayer().
+          */
 
-               tabs = tabs
-                   .merge(tabsEnter);
 
-               // Update
-               wrapper.selectAll('.tab')
-                   .classed('active', function (d, i) {
-                       return i === _activeTab;
-                   });
+         function showLayer() {
+           var service = getService();
+           if (!service) return;
+           editOn();
+           layer.style('opacity', 0).transition().duration(250).style('opacity', 1).on('end', function () {
+             dispatch.call('change');
+           });
+         }
+         /**
+          * hideLayer().
+          */
 
 
-               var shortcuts = shortcutsList
-                   .selectAll('.shortcut-tab')
-                   .data(dataShortcuts);
+         function hideLayer() {
+           throttledRedraw.cancel();
+           layer.transition().duration(250).style('opacity', 0).on('end', editOff);
+         }
+         /**
+          * editOn().
+          */
 
-               var shortcutsEnter = shortcuts
-                   .enter()
-                   .append('div')
-                   .attr('class', function(d) { return 'shortcut-tab shortcut-tab-' + d.tab; });
 
-               var columnsEnter = shortcutsEnter
-                   .selectAll('.shortcut-column')
-                   .data(function (d) { return d.columns; })
-                   .enter()
-                   .append('table')
-                   .attr('class', 'shortcut-column');
+         function editOn() {
+           layer.style('display', 'block');
+         }
+         /**
+          * editOff().
+          */
 
-               var rowsEnter = columnsEnter
-                   .selectAll('.shortcut-row')
-                   .data(function (d) { return d.rows; })
-                   .enter()
-                   .append('tr')
-                   .attr('class', 'shortcut-row');
 
+         function editOff() {
+           layer.selectAll('.viewfield-group').remove();
+           layer.style('display', 'none');
+         }
+         /**
+          * click() Handles 'bubble' point click event.
+          */
 
-               var sectionRows = rowsEnter
-                   .filter(function (d) { return !d.shortcuts; });
 
-               sectionRows
-                   .append('td');
+         function click(d3_event, d) {
+           var service = getService();
+           if (!service) return; // try to preserve the viewer rotation when staying on the same sequence
 
-               sectionRows
-                   .append('td')
-                   .attr('class', 'shortcut-section')
-                   .append('h3')
-                   .text(function (d) { return _t(d.text); });
+           if (d.sequenceKey !== _selectedSequence) {
+             _viewerYaw = 0; // reset
+           }
 
+           _selectedSequence = d.sequenceKey;
+           service.ensureViewerLoaded(context).then(function () {
+             service.selectImage(context, d.key).yaw(_viewerYaw).showViewer(context);
+           });
+           context.map().centerEase(d.loc);
+         }
+         /**
+          * mouseover().
+          */
 
-               var shortcutRows = rowsEnter
-                   .filter(function (d) { return d.shortcuts; });
 
-               var shortcutKeys = shortcutRows
-                   .append('td')
-                   .attr('class', 'shortcut-keys');
+         function mouseover(d3_event, d) {
+           var service = getService();
+           if (service) service.setStyles(context, d);
+         }
+         /**
+          * mouseout().
+          */
 
-               var modifierKeys = shortcutKeys
-                   .filter(function (d) { return d.modifiers; });
 
-               modifierKeys
-                   .selectAll('kbd.modifier')
-                   .data(function (d) {
-                       if (detected.os === 'win' && d.text === 'shortcuts.editing.commands.redo') {
-                           return ['⌘'];
-                       } else if (detected.os !== 'mac' && d.text === 'shortcuts.browsing.display_options.fullscreen') {
-                           return [];
-                       } else {
-                           return d.modifiers;
-                       }
-                   })
-                   .enter()
-                   .each(function () {
-                       var selection = select(this);
+         function mouseout() {
+           var service = getService();
+           if (service) service.setStyles(context, null);
+         }
+         /**
+          * transform().
+          */
 
-                       selection
-                           .append('kbd')
-                           .attr('class', 'modifier')
-                           .text(function (d) { return uiCmd.display(d); });
 
-                       selection
-                           .append('span')
-                           .text('+');
-                   });
+         function transform(d) {
+           var t = svgPointTransform(projection)(d);
+           var rot = d.ca + _viewerYaw;
 
+           if (rot) {
+             t += ' rotate(' + Math.floor(rot) + ',0,0)';
+           }
 
-               shortcutKeys
-                   .selectAll('kbd.shortcut')
-                   .data(function (d) {
-                       var arr = d.shortcuts;
-                       if (detected.os === 'win' && d.text === 'shortcuts.editing.commands.redo') {
-                           arr = ['Y'];
-                       } else if (detected.os !== 'mac' && d.text === 'shortcuts.browsing.display_options.fullscreen') {
-                           arr = ['F11'];
-                       }
+           return t;
+         }
 
-                       // replace translations
-                       arr = arr.map(function(s) {
-                           return uiCmd.display(s.indexOf('.') !== -1 ? _t(s) : s);
-                       });
+         function viewerChanged() {
+           var service = getService();
+           if (!service) return;
+           var viewer = service.viewer();
+           if (!viewer) return; // update viewfield rotation
 
-                       return utilArrayUniq(arr).map(function(s) {
-                           return {
-                               shortcut: s,
-                               separator: d.separator,
-                               suffix: d.suffix
-                           };
-                       });
-                   })
-                   .enter()
-                   .each(function (d, i, nodes) {
-                       var selection = select(this);
-                       var click = d.shortcut.toLowerCase().match(/(.*).click/);
-
-                       if (click && click[1]) {   // replace "left_click", "right_click" with mouse icon
-                           selection
-                               .call(svgIcon('#iD-walkthrough-mouse-' + click[1], 'operation'));
-                       } else if (d.shortcut.toLowerCase() === 'long-press') {
-                           selection
-                               .call(svgIcon('#iD-walkthrough-longpress', 'longpress operation'));
-                       } else if (d.shortcut.toLowerCase() === 'tap') {
-                           selection
-                               .call(svgIcon('#iD-walkthrough-tap', 'tap operation'));
-                       } else {
-                           selection
-                               .append('kbd')
-                               .attr('class', 'shortcut')
-                               .text(function (d) { return d.shortcut; });
-                       }
+           _viewerYaw = viewer.getYaw(); // avoid updating if the map is currently transformed
+           // e.g. during drags or easing.
 
-                       if (i < nodes.length - 1) {
-                           selection
-                               .append('span')
-                               .text(d.separator || '\u00a0' + _t('shortcuts.or') + '\u00a0');
-                       } else if (i === nodes.length - 1 && d.suffix) {
-                           selection
-                               .append('span')
-                               .text(d.suffix);
-                       }
-                   });
+           if (context.map().isTransformed()) return;
+           layer.selectAll('.viewfield-group.currentView').attr('transform', transform);
+         }
 
+         function filterBubbles(bubbles) {
+           var fromDate = context.photos().fromDate();
+           var toDate = context.photos().toDate();
+           var usernames = context.photos().usernames();
 
-               shortcutKeys
-                   .filter(function(d) { return d.gesture; })
-                   .each(function () {
-                       var selection = select(this);
+           if (fromDate) {
+             var fromTimestamp = new Date(fromDate).getTime();
+             bubbles = bubbles.filter(function (bubble) {
+               return new Date(bubble.captured_at).getTime() >= fromTimestamp;
+             });
+           }
 
-                       selection
-                           .append('span')
-                           .text('+');
+           if (toDate) {
+             var toTimestamp = new Date(toDate).getTime();
+             bubbles = bubbles.filter(function (bubble) {
+               return new Date(bubble.captured_at).getTime() <= toTimestamp;
+             });
+           }
 
-                       selection
-                           .append('span')
-                           .attr('class', 'gesture')
-                           .text(function (d) { return _t(d.gesture); });
-                   });
+           if (usernames) {
+             bubbles = bubbles.filter(function (bubble) {
+               return usernames.indexOf(bubble.captured_by) !== -1;
+             });
+           }
 
+           return bubbles;
+         }
 
-               shortcutRows
-                   .append('td')
-                   .attr('class', 'shortcut-desc')
-                   .text(function (d) { return d.text ? _t(d.text) : '\u00a0'; });
+         function filterSequences(sequences) {
+           var fromDate = context.photos().fromDate();
+           var toDate = context.photos().toDate();
+           var usernames = context.photos().usernames();
 
+           if (fromDate) {
+             var fromTimestamp = new Date(fromDate).getTime();
+             sequences = sequences.filter(function (sequences) {
+               return new Date(sequences.properties.captured_at).getTime() >= fromTimestamp;
+             });
+           }
 
-               shortcuts = shortcuts
-                   .merge(shortcutsEnter);
+           if (toDate) {
+             var toTimestamp = new Date(toDate).getTime();
+             sequences = sequences.filter(function (sequences) {
+               return new Date(sequences.properties.captured_at).getTime() <= toTimestamp;
+             });
+           }
 
-               // Update
-               wrapper.selectAll('.shortcut-tab')
-                   .style('display', function (d, i) {
-                       return i === _activeTab ? 'flex' : 'none';
-                   });
+           if (usernames) {
+             sequences = sequences.filter(function (sequences) {
+               return usernames.indexOf(sequences.properties.captured_by) !== -1;
+             });
            }
 
+           return sequences;
+         }
+         /**
+          * update().
+          */
 
-           return function(selection, show) {
-               _selection = selection;
-               if (show) {
-                   _modalSelection = uiModal(selection);
-                   _modalSelection.call(shortcutsModal);
-               }
-           };
-       }
 
-       var pair_1 = pair;
+         function update() {
+           var viewer = context.container().select('.photoviewer');
+           var selected = viewer.empty() ? undefined : viewer.datum();
+           var z = ~~context.map().zoom();
+           var showMarkers = z >= minMarkerZoom;
+           var showViewfields = z >= minViewfieldZoom;
+           var service = getService();
+           var sequences = [];
+           var bubbles = [];
 
+           if (context.photos().showsPanoramic()) {
+             sequences = service ? service.sequences(projection) : [];
+             bubbles = service && showMarkers ? service.bubbles(projection) : [];
+             sequences = filterSequences(sequences);
+             bubbles = filterBubbles(bubbles);
+           }
 
-       function search(input, dims) {
-         if (!dims) dims = 'NSEW';
-         if (typeof input !== 'string') return null;
+           var traces = layer.selectAll('.sequences').selectAll('.sequence').data(sequences, function (d) {
+             return d.properties.key;
+           }); // exit
 
-         input = input.toUpperCase();
-         var regex = /^[\s\,]*([NSEW])?\s*([\-|\—|\―]?[0-9.]+)[°º˚]?\s*(?:([0-9.]+)['’′‘]\s*)?(?:([0-9.]+)(?:''|"|”|″)\s*)?([NSEW])?/;
+           traces.exit().remove(); // enter/update
 
-         var m = input.match(regex);
-         if (!m) return null;  // no match
+           traces = traces.enter().append('path').attr('class', 'sequence').merge(traces).attr('d', svgPath(projection).geojson);
+           var groups = layer.selectAll('.markers').selectAll('.viewfield-group').data(bubbles, function (d) {
+             // force reenter once bubbles are attached to a sequence
+             return d.key + (d.sequenceKey ? 'v1' : 'v0');
+           }); // exit
 
-         var matched = m[0];
+           groups.exit().remove(); // enter
 
-         // extract dimension.. m[1] = leading, m[5] = trailing
-         var dim;
-         if (m[1] && m[5]) {                 // if matched both..
-           dim = m[1];                       // keep leading
-           matched = matched.slice(0, -1);   // remove trailing dimension from match
-         } else {
-           dim = m[1] || m[5];
-         }
+           var groupsEnter = groups.enter().append('g').attr('class', 'viewfield-group').on('mouseenter', mouseover).on('mouseleave', mouseout).on('click', click);
+           groupsEnter.append('g').attr('class', 'viewfield-scale'); // update
 
-         // if unrecognized dimension
-         if (dim && dims.indexOf(dim) === -1) return null;
+           var markers = groups.merge(groupsEnter).sort(function (a, b) {
+             return a === selected ? 1 : b === selected ? -1 : b.loc[1] - a.loc[1];
+           }).attr('transform', transform).select('.viewfield-scale');
+           markers.selectAll('circle').data([0]).enter().append('circle').attr('dx', '0').attr('dy', '0').attr('r', '6');
+           var viewfields = markers.selectAll('.viewfield').data(showViewfields ? [0] : []);
+           viewfields.exit().remove(); // viewfields may or may not be drawn...
+           // but if they are, draw below the circles
 
-         // extract DMS
-         var deg = m[2] ? parseFloat(m[2]) : 0;
-         var min = m[3] ? parseFloat(m[3]) / 60 : 0;
-         var sec = m[4] ? parseFloat(m[4]) / 3600 : 0;
-         var sign = (deg < 0) ? -1 : 1;
-         if (dim === 'S' || dim === 'W') sign *= -1;
+           viewfields.enter().insert('path', 'circle').attr('class', 'viewfield').attr('transform', 'scale(1.5,1.5),translate(-8, -13)').attr('d', viewfieldPath);
 
-         return {
-           val: (Math.abs(deg) + min + sec) * sign,
-           dim: dim,
-           matched: matched,
-           remain: input.slice(matched.length)
-         };
-       }
+           function viewfieldPath() {
+             var d = this.parentNode.__data__;
 
+             if (d.pano) {
+               return 'M 8,13 m -10,0 a 10,10 0 1,0 20,0 a 10,10 0 1,0 -20,0';
+             } else {
+               return 'M 6,9 C 8,8.4 8,8.4 10,9 L 16,-2 C 12,-5 4,-5 0,-2 z';
+             }
+           }
+         }
+         /**
+          * drawImages()
+          * drawImages is the method that is returned (and that runs) every time 'svgStreetside()' is called.
+          * 'svgStreetside()' is called from index.js
+          */
 
-       function pair(input, dims) {
-         input = input.trim();
-         var one = search(input, dims);
-         if (!one) return null;
 
-         input = one.remain.trim();
-         var two = search(input, dims);
-         if (!two || two.remain) return null;
+         function drawImages(selection) {
+           var enabled = svgStreetside.enabled;
+           var service = getService();
+           layer = selection.selectAll('.layer-streetside-images').data(service ? [0] : []);
+           layer.exit().remove();
+           var layerEnter = layer.enter().append('g').attr('class', 'layer-streetside-images').style('display', enabled ? 'block' : 'none');
+           layerEnter.append('g').attr('class', 'sequences');
+           layerEnter.append('g').attr('class', 'markers');
+           layer = layerEnter.merge(layer);
 
-         if (one.dim) {
-           return swapdim(one.val, two.val, one.dim);
-         } else {
-           return [one.val, two.val];
+           if (enabled) {
+             if (service && ~~context.map().zoom() >= minZoom) {
+               editOn();
+               update();
+               service.loadBubbles(projection);
+             } else {
+               editOff();
+             }
+           }
          }
-       }
+         /**
+          * drawImages.enabled().
+          */
 
 
-       function swapdim(a, b, dim) {
-         if (dim === 'N' || dim === 'S') return [a, b];
-         if (dim === 'W' || dim === 'E') return [b, a];
-       }
+         drawImages.enabled = function (_) {
+           if (!arguments.length) return svgStreetside.enabled;
+           svgStreetside.enabled = _;
 
-       function uiFeatureList(context) {
-           var _geocodeResults;
+           if (svgStreetside.enabled) {
+             showLayer();
+             context.photos().on('change.streetside', update);
+           } else {
+             hideLayer();
+             context.photos().on('change.streetside', null);
+           }
 
+           dispatch.call('change');
+           return this;
+         };
+         /**
+          * drawImages.supported().
+          */
 
-           function featureList(selection) {
-               var header = selection
-                   .append('div')
-                   .attr('class', 'header fillL cf');
 
-               header
-                   .append('h3')
-                   .text(_t('inspector.feature_list'));
+         drawImages.supported = function () {
+           return !!getService();
+         };
 
-               var searchWrap = selection
-                   .append('div')
-                   .attr('class', 'search-header');
+         init();
+         return drawImages;
+       }
 
-               var search = searchWrap
-                   .append('input')
-                   .attr('placeholder', _t('inspector.search'))
-                   .attr('type', 'search')
-                   .call(utilNoAuto)
-                   .on('keypress', keypress)
-                   .on('keydown', keydown)
-                   .on('input', inputevent);
+       function svgMapillaryImages(projection, context, dispatch) {
+         var throttledRedraw = throttle(function () {
+           dispatch.call('change');
+         }, 1000);
 
-               searchWrap
-                   .call(svgIcon('#iD-icon-search', 'pre-text'));
+         var minZoom = 12;
+         var minMarkerZoom = 16;
+         var minViewfieldZoom = 18;
+         var layer = select(null);
 
-               var listWrap = selection
-                   .append('div')
-                   .attr('class', 'inspector-body');
+         var _mapillary;
 
-               var list = listWrap
-                   .append('div')
-                   .attr('class', 'feature-list cf');
+         var viewerCompassAngle;
 
-               context
-                   .on('exit.feature-list', clearSearch);
-               context.map()
-                   .on('drawn.feature-list', mapDrawn);
+         function init() {
+           if (svgMapillaryImages.initialized) return; // run once
 
-               context.keybinding()
-                   .on(uiCmd('⌘F'), focusSearch);
+           svgMapillaryImages.enabled = false;
+           svgMapillaryImages.initialized = true;
+         }
 
+         function getService() {
+           if (services.mapillary && !_mapillary) {
+             _mapillary = services.mapillary;
 
-               function focusSearch() {
-                   var mode = context.mode() && context.mode().id;
-                   if (mode !== 'browse') return;
+             _mapillary.event.on('loadedImages', throttledRedraw);
+           } else if (!services.mapillary && _mapillary) {
+             _mapillary = null;
+           }
 
-                   event.preventDefault();
-                   search.node().focus();
-               }
+           return _mapillary;
+         }
 
+         function showLayer() {
+           var service = getService();
+           if (!service) return;
+           editOn();
+           layer.style('opacity', 0).transition().duration(250).style('opacity', 1).on('end', function () {
+             dispatch.call('change');
+           });
+         }
 
-               function keydown() {
-                   if (event.keyCode === 27) {  // escape
-                       search.node().blur();
-                   }
-               }
+         function hideLayer() {
+           throttledRedraw.cancel();
+           layer.transition().duration(250).style('opacity', 0).on('end', editOff);
+         }
 
+         function editOn() {
+           layer.style('display', 'block');
+         }
 
-               function keypress() {
-                   var q = search.property('value'),
-                       items = list.selectAll('.feature-list-item');
-                   if (event.keyCode === 13 && q.length && items.size()) {  // return
-                       click(items.datum());
-                   }
-               }
+         function editOff() {
+           layer.selectAll('.viewfield-group').remove();
+           layer.style('display', 'none');
+         }
 
+         function click(d3_event, d) {
+           var service = getService();
+           if (!service) return;
+           service.ensureViewerLoaded(context).then(function () {
+             service.selectImage(context, d.key).showViewer(context);
+           });
+           context.map().centerEase(d.loc);
+         }
 
-               function inputevent() {
-                   _geocodeResults = undefined;
-                   drawList();
-               }
+         function mouseover(d) {
+           var service = getService();
+           if (service) service.setStyles(context, d);
+         }
 
+         function mouseout() {
+           var service = getService();
+           if (service) service.setStyles(context, null);
+         }
 
-               function clearSearch() {
-                   search.property('value', '');
-                   drawList();
-               }
+         function transform(d) {
+           var t = svgPointTransform(projection)(d);
 
+           if (d.pano && viewerCompassAngle !== null && isFinite(viewerCompassAngle)) {
+             t += ' rotate(' + Math.floor(viewerCompassAngle) + ',0,0)';
+           } else if (d.ca) {
+             t += ' rotate(' + Math.floor(d.ca) + ',0,0)';
+           }
 
-               function mapDrawn(e) {
-                   if (e.full) {
-                       drawList();
-                   }
-               }
+           return t;
+         }
 
+         function filterImages(images) {
+           var showsPano = context.photos().showsPanoramic();
+           var showsFlat = context.photos().showsFlat();
+           var fromDate = context.photos().fromDate();
+           var toDate = context.photos().toDate();
+           var usernames = context.photos().usernames();
 
-               function features() {
-                   var result = [];
-                   var graph = context.graph();
-                   var visibleCenter = context.map().extent().center();
-                   var q = search.property('value').toLowerCase();
+           if (!showsPano || !showsFlat) {
+             images = images.filter(function (image) {
+               if (image.pano) return showsPano;
+               return showsFlat;
+             });
+           }
 
-                   if (!q) return result;
+           if (fromDate) {
+             var fromTimestamp = new Date(fromDate).getTime();
+             images = images.filter(function (image) {
+               return new Date(image.captured_at).getTime() >= fromTimestamp;
+             });
+           }
 
-                   var idMatch = q.match(/(?:^|\W)(node|way|relation|[nwr])\W?0*([1-9]\d*)(?:\W|$)/i);
+           if (toDate) {
+             var toTimestamp = new Date(toDate).getTime();
+             images = images.filter(function (image) {
+               return new Date(image.captured_at).getTime() <= toTimestamp;
+             });
+           }
 
-                   if (idMatch) {
-                       var elemType = idMatch[1].charAt(0);
-                       var elemId = idMatch[2];
-                       result.push({
-                           id: elemType + elemId,
-                           geometry: elemType === 'n' ? 'point' : elemType === 'w' ? 'line' : 'relation',
-                           type: elemType === 'n' ? _t('inspector.node') : elemType === 'w' ? _t('inspector.way') : _t('inspector.relation'),
-                           name: elemId
-                       });
-                   }
+           if (usernames) {
+             images = images.filter(function (image) {
+               return usernames.indexOf(image.captured_by) !== -1;
+             });
+           }
 
-                   var locationMatch = pair_1(q.toUpperCase()) || q.match(/^(-?\d+\.?\d*)\s+(-?\d+\.?\d*)$/);
+           return images;
+         }
 
-                   if (locationMatch) {
-                       var loc = [parseFloat(locationMatch[0]), parseFloat(locationMatch[1])];
-                       result.push({
-                           id: -1,
-                           geometry: 'point',
-                           type: _t('inspector.location'),
-                           name: dmsCoordinatePair([loc[1], loc[0]]),
-                           location: loc
-                       });
-                   }
+         function filterSequences(sequences, service) {
+           var showsPano = context.photos().showsPanoramic();
+           var showsFlat = context.photos().showsFlat();
+           var fromDate = context.photos().fromDate();
+           var toDate = context.photos().toDate();
+           var usernames = context.photos().usernames();
 
-                   var allEntities = graph.entities;
-                   var localResults = [];
-                   for (var id in allEntities) {
-                       var entity = allEntities[id];
-                       if (!entity) continue;
-
-                       var name = utilDisplayName(entity) || '';
-                       if (name.toLowerCase().indexOf(q) < 0) continue;
-
-                       var matched = _mainPresetIndex.match(entity, graph);
-                       var type = (matched && matched.name()) || utilDisplayType(entity.id);
-                       var extent = entity.extent(graph);
-                       var distance = extent ? geoSphericalDistance(visibleCenter, extent.center()) : 0;
-
-                       localResults.push({
-                           id: entity.id,
-                           entity: entity,
-                           geometry: entity.geometry(graph),
-                           type: type,
-                           name: name,
-                           distance: distance
-                       });
+           if (!showsPano || !showsFlat) {
+             sequences = sequences.filter(function (sequence) {
+               if (sequence.properties.hasOwnProperty('pano')) {
+                 if (sequence.properties.pano) return showsPano;
+                 return showsFlat;
+               } else {
+                 // if the sequence doesn't specify pano or not, search its images
+                 var cProps = sequence.properties.coordinateProperties;
 
-                       if (localResults.length > 100) break;
-                   }
-                   localResults = localResults.sort(function byDistance(a, b) {
-                       return a.distance - b.distance;
-                   });
-                   result = result.concat(localResults);
+                 if (cProps && cProps.image_keys && cProps.image_keys.length > 0) {
+                   for (var index in cProps.image_keys) {
+                     var imageKey = cProps.image_keys[index];
+                     var image = service.cachedImage(imageKey);
 
-                   (_geocodeResults || []).forEach(function(d) {
-                       if (d.osm_type && d.osm_id) {    // some results may be missing these - #1890
+                     if (image && image.hasOwnProperty('pano')) {
+                       if (image.pano) return showsPano;
+                       return showsFlat;
+                     }
+                   }
+                 }
+               }
 
-                           // Make a temporary osmEntity so we can preset match
-                           // and better localize the search result - #4725
-                           var id = osmEntity.id.fromOSM(d.osm_type, d.osm_id);
-                           var tags = {};
-                           tags[d.class] = d.type;
+               return false;
+             });
+           }
 
-                           var attrs = { id: id, type: d.osm_type, tags: tags };
-                           if (d.osm_type === 'way') {   // for ways, add some fake closed nodes
-                               attrs.nodes = ['a','a'];  // so that geometry area is possible
-                           }
+           if (fromDate) {
+             var fromTimestamp = new Date(fromDate).getTime();
+             sequences = sequences.filter(function (sequence) {
+               return new Date(sequence.properties.captured_at).getTime() >= fromTimestamp;
+             });
+           }
 
-                           var tempEntity = osmEntity(attrs);
-                           var tempGraph = coreGraph([tempEntity]);
-                           var matched = _mainPresetIndex.match(tempEntity, tempGraph);
-                           var type = (matched && matched.name()) || utilDisplayType(id);
-
-                           result.push({
-                               id: tempEntity.id,
-                               geometry: tempEntity.geometry(tempGraph),
-                               type: type,
-                               name: d.display_name,
-                               extent: new geoExtent(
-                                   [parseFloat(d.boundingbox[3]), parseFloat(d.boundingbox[0])],
-                                   [parseFloat(d.boundingbox[2]), parseFloat(d.boundingbox[1])])
-                           });
-                       }
-                   });
+           if (toDate) {
+             var toTimestamp = new Date(toDate).getTime();
+             sequences = sequences.filter(function (sequence) {
+               return new Date(sequence.properties.captured_at).getTime() <= toTimestamp;
+             });
+           }
 
-                   if (q.match(/^[0-9]+$/)) {
-                       // if query is just a number, possibly an OSM ID without a prefix
-                       result.push({
-                           id: 'n' + q,
-                           geometry: 'point',
-                           type: _t('inspector.node'),
-                           name: q
-                       });
-                       result.push({
-                           id: 'w' + q,
-                           geometry: 'line',
-                           type: _t('inspector.way'),
-                           name: q
-                       });
-                       result.push({
-                           id: 'r' + q,
-                           geometry: 'relation',
-                           type: _t('inspector.relation'),
-                           name: q
-                       });
-                   }
+           if (usernames) {
+             sequences = sequences.filter(function (sequence) {
+               return usernames.indexOf(sequence.properties.username) !== -1;
+             });
+           }
 
-                   return result;
-               }
+           return sequences;
+         }
 
+         function update() {
+           var z = ~~context.map().zoom();
+           var showMarkers = z >= minMarkerZoom;
+           var showViewfields = z >= minViewfieldZoom;
+           var service = getService();
+           var sequences = service ? service.sequences(projection) : [];
+           var images = service && showMarkers ? service.images(projection) : [];
+           images = filterImages(images);
+           sequences = filterSequences(sequences, service);
+           service.filterViewer(context);
+           var traces = layer.selectAll('.sequences').selectAll('.sequence').data(sequences, function (d) {
+             return d.properties.key;
+           }); // exit
+
+           traces.exit().remove(); // enter/update
+
+           traces = traces.enter().append('path').attr('class', 'sequence').merge(traces).attr('d', svgPath(projection).geojson);
+           var groups = layer.selectAll('.markers').selectAll('.viewfield-group').data(images, function (d) {
+             return d.key;
+           }); // exit
+
+           groups.exit().remove(); // enter
+
+           var groupsEnter = groups.enter().append('g').attr('class', 'viewfield-group').on('mouseenter', mouseover).on('mouseleave', mouseout).on('click', click);
+           groupsEnter.append('g').attr('class', 'viewfield-scale'); // update
+
+           var markers = groups.merge(groupsEnter).sort(function (a, b) {
+             return b.loc[1] - a.loc[1]; // sort Y
+           }).attr('transform', transform).select('.viewfield-scale');
+           markers.selectAll('circle').data([0]).enter().append('circle').attr('dx', '0').attr('dy', '0').attr('r', '6');
+           var viewfields = markers.selectAll('.viewfield').data(showViewfields ? [0] : []);
+           viewfields.exit().remove();
+           viewfields.enter() // viewfields may or may not be drawn...
+           .insert('path', 'circle') // but if they are, draw below the circles
+           .attr('class', 'viewfield').classed('pano', function () {
+             return this.parentNode.__data__.pano;
+           }).attr('transform', 'scale(1.5,1.5),translate(-8, -13)').attr('d', viewfieldPath);
 
-               function drawList() {
-                   var value = search.property('value');
-                   var results = features();
+           function viewfieldPath() {
+             var d = this.parentNode.__data__;
 
-                   list.classed('filtered', value.length);
+             if (d.pano) {
+               return 'M 8,13 m -10,0 a 10,10 0 1,0 20,0 a 10,10 0 1,0 -20,0';
+             } else {
+               return 'M 6,9 C 8,8.4 8,8.4 10,9 L 16,-2 C 12,-5 4,-5 0,-2 z';
+             }
+           }
+         }
 
-                   var resultsIndicator = list.selectAll('.no-results-item')
-                       .data([0])
-                       .enter()
-                       .append('button')
-                       .property('disabled', true)
-                       .attr('class', 'no-results-item')
-                       .call(svgIcon('#iD-icon-alert', 'pre-text'));
-
-                   resultsIndicator.append('span')
-                       .attr('class', 'entity-name');
-
-                   list.selectAll('.no-results-item .entity-name')
-                       .text(_t('geocoder.no_results_worldwide'));
-
-                   if (services.geocoder) {
-                     list.selectAll('.geocode-item')
-                         .data([0])
-                         .enter()
-                         .append('button')
-                         .attr('class', 'geocode-item')
-                         .on('click', geocoderSearch)
-                         .append('div')
-                         .attr('class', 'label')
-                         .append('span')
-                         .attr('class', 'entity-name')
-                         .text(_t('geocoder.search'));
-                   }
+         function drawImages(selection) {
+           var enabled = svgMapillaryImages.enabled;
+           var service = getService();
+           layer = selection.selectAll('.layer-mapillary').data(service ? [0] : []);
+           layer.exit().remove();
+           var layerEnter = layer.enter().append('g').attr('class', 'layer-mapillary').style('display', enabled ? 'block' : 'none');
+           layerEnter.append('g').attr('class', 'sequences');
+           layerEnter.append('g').attr('class', 'markers');
+           layer = layerEnter.merge(layer);
 
-                   list.selectAll('.no-results-item')
-                       .style('display', (value.length && !results.length) ? 'block' : 'none');
+           if (enabled) {
+             if (service && ~~context.map().zoom() >= minZoom) {
+               editOn();
+               update();
+               service.loadImages(projection);
+             } else {
+               editOff();
+             }
+           }
+         }
 
-                   list.selectAll('.geocode-item')
-                       .style('display', (value && _geocodeResults === undefined) ? 'block' : 'none');
+         drawImages.enabled = function (_) {
+           if (!arguments.length) return svgMapillaryImages.enabled;
+           svgMapillaryImages.enabled = _;
 
-                   list.selectAll('.feature-list-item')
-                       .data([-1])
-                       .remove();
+           if (svgMapillaryImages.enabled) {
+             showLayer();
+             context.photos().on('change.mapillary_images', update);
+           } else {
+             hideLayer();
+             context.photos().on('change.mapillary_images', null);
+           }
 
-                   var items = list.selectAll('.feature-list-item')
-                       .data(results, function(d) { return d.id; });
+           dispatch.call('change');
+           return this;
+         };
 
-                   var enter = items.enter()
-                       .insert('button', '.geocode-item')
-                       .attr('class', 'feature-list-item')
-                       .on('mouseover', mouseover)
-                       .on('mouseout', mouseout)
-                       .on('click', click);
+         drawImages.supported = function () {
+           return !!getService();
+         };
 
-                   var label = enter
-                       .append('div')
-                       .attr('class', 'label');
+         init();
+         return drawImages;
+       }
 
-                   label
-                       .each(function(d) {
-                           select(this)
-                               .call(svgIcon('#iD-icon-' + d.geometry, 'pre-text'));
-                       });
+       function svgMapillaryPosition(projection, context) {
+         var throttledRedraw = throttle(function () {
+           update();
+         }, 1000);
 
-                   label
-                       .append('span')
-                       .attr('class', 'entity-type')
-                       .text(function(d) { return d.type; });
+         var minZoom = 12;
+         var minViewfieldZoom = 18;
+         var layer = select(null);
 
-                   label
-                       .append('span')
-                       .attr('class', 'entity-name')
-                       .text(function(d) { return d.name; });
+         var _mapillary;
 
-                   enter
-                       .style('opacity', 0)
-                       .transition()
-                       .style('opacity', 1);
+         var viewerCompassAngle;
 
-                   items.order();
+         function init() {
+           if (svgMapillaryPosition.initialized) return; // run once
 
-                   items.exit()
-                       .remove();
-               }
+           svgMapillaryPosition.initialized = true;
+         }
 
+         function getService() {
+           if (services.mapillary && !_mapillary) {
+             _mapillary = services.mapillary;
 
-               function mouseover(d) {
-                   if (d.id === -1) return;
+             _mapillary.event.on('nodeChanged', throttledRedraw);
 
-                   utilHighlightEntities([d.id], true, context);
-               }
+             _mapillary.event.on('bearingChanged', function (e) {
+               viewerCompassAngle = e;
+               if (context.map().isTransformed()) return;
+               layer.selectAll('.viewfield-group.currentView').filter(function (d) {
+                 return d.pano;
+               }).attr('transform', transform);
+             });
+           } else if (!services.mapillary && _mapillary) {
+             _mapillary = null;
+           }
 
+           return _mapillary;
+         }
 
-               function mouseout(d) {
-                   if (d.id === -1) return;
+         function editOn() {
+           layer.style('display', 'block');
+         }
 
-                   utilHighlightEntities([d.id], false, context);
-               }
+         function editOff() {
+           layer.selectAll('.viewfield-group').remove();
+           layer.style('display', 'none');
+         }
 
+         function transform(d) {
+           var t = svgPointTransform(projection)(d);
 
-               function click(d) {
-                   event.preventDefault();
+           if (d.pano && viewerCompassAngle !== null && isFinite(viewerCompassAngle)) {
+             t += ' rotate(' + Math.floor(viewerCompassAngle) + ',0,0)';
+           } else if (d.ca) {
+             t += ' rotate(' + Math.floor(d.ca) + ',0,0)';
+           }
 
-                   if (d.location) {
-                       context.map().centerZoomEase([d.location[1], d.location[0]], 19);
+           return t;
+         }
 
-                   } else if (d.entity) {
-                       utilHighlightEntities([d.id], false, context);
+         function update() {
+           var z = ~~context.map().zoom();
+           var showViewfields = z >= minViewfieldZoom;
+           var service = getService();
+           var node = service && service.getActiveImage();
+           var groups = layer.selectAll('.markers').selectAll('.viewfield-group').data(node ? [node] : [], function (d) {
+             return d.key;
+           }); // exit
+
+           groups.exit().remove(); // enter
+
+           var groupsEnter = groups.enter().append('g').attr('class', 'viewfield-group currentView highlighted');
+           groupsEnter.append('g').attr('class', 'viewfield-scale'); // update
+
+           var markers = groups.merge(groupsEnter).attr('transform', transform).select('.viewfield-scale');
+           markers.selectAll('circle').data([0]).enter().append('circle').attr('dx', '0').attr('dy', '0').attr('r', '6');
+           var viewfields = markers.selectAll('.viewfield').data(showViewfields ? [0] : []);
+           viewfields.exit().remove();
+           viewfields.enter().insert('path', 'circle').attr('class', 'viewfield').classed('pano', function () {
+             return this.parentNode.__data__.pano;
+           }).attr('transform', 'scale(1.5,1.5),translate(-8, -13)').attr('d', viewfieldPath);
 
-                       context.enter(modeSelect(context, [d.entity.id]));
-                       context.map().zoomToEase(d.entity);
+           function viewfieldPath() {
+             var d = this.parentNode.__data__;
 
-                   } else {
-                       // download, zoom to, and select the entity with the given ID
-                       context.zoomToEntity(d.id);
-                   }
-               }
+             if (d.pano) {
+               return 'M 8,13 m -10,0 a 10,10 0 1,0 20,0 a 10,10 0 1,0 -20,0';
+             } else {
+               return 'M 6,9 C 8,8.4 8,8.4 10,9 L 16,-2 C 12,-5 4,-5 0,-2 z';
+             }
+           }
+         }
 
+         function drawImages(selection) {
+           var service = getService();
+           layer = selection.selectAll('.layer-mapillary-position').data(service ? [0] : []);
+           layer.exit().remove();
+           var layerEnter = layer.enter().append('g').attr('class', 'layer-mapillary-position');
+           layerEnter.append('g').attr('class', 'markers');
+           layer = layerEnter.merge(layer);
 
-               function geocoderSearch() {
-                   services.geocoder.search(search.property('value'), function (err, resp) {
-                       _geocodeResults = resp || [];
-                       drawList();
-                   });
-               }
+           if (service && ~~context.map().zoom() >= minZoom) {
+             editOn();
+             update();
+           } else {
+             editOff();
            }
+         }
+
+         drawImages.enabled = function () {
+           update();
+           return this;
+         };
 
+         drawImages.supported = function () {
+           return !!getService();
+         };
 
-           return featureList;
+         init();
+         return drawImages;
        }
 
-       function uiSectionEntityIssues(context) {
+       function svgMapillarySigns(projection, context, dispatch) {
+         var throttledRedraw = throttle(function () {
+           dispatch.call('change');
+         }, 1000);
 
-           var _entityIDs = [];
-           var _issues = [];
-           var _activeIssueID;
+         var minZoom = 12;
+         var layer = select(null);
 
-           var section = uiSection('entity-issues', context)
-               .shouldDisplay(function() {
-                   return _issues.length > 0;
-               })
-               .title(function() {
-                   return _t('issues.list_title', { count: _issues.length });
-               })
-               .disclosureContent(renderDisclosureContent);
+         var _mapillary;
 
-           context.validator()
-               .on('validated.entity_issues', function() {
-                   // Refresh on validated events
-                   reloadIssues();
-                   section.reRender();
-               })
-               .on('focusedIssue.entity_issues', function(issue) {
-                    makeActiveIssue(issue.id);
-               });
+         function init() {
+           if (svgMapillarySigns.initialized) return; // run once
 
-           function reloadIssues() {
-               _issues = context.validator().getSharedEntityIssues(_entityIDs, { includeDisabledRules: true });
-           }
+           svgMapillarySigns.enabled = false;
+           svgMapillarySigns.initialized = true;
+         }
+
+         function getService() {
+           if (services.mapillary && !_mapillary) {
+             _mapillary = services.mapillary;
 
-           function makeActiveIssue(issueID) {
-               _activeIssueID = issueID;
-               section.selection().selectAll('.issue-container')
-                   .classed('active', function(d) { return d.id === _activeIssueID; });
+             _mapillary.event.on('loadedSigns', throttledRedraw);
+           } else if (!services.mapillary && _mapillary) {
+             _mapillary = null;
            }
 
-           function renderDisclosureContent(selection) {
+           return _mapillary;
+         }
 
-               selection.classed('grouped-items-area', true);
+         function showLayer() {
+           var service = getService();
+           if (!service) return;
+           service.loadSignResources(context);
+           editOn();
+         }
 
-               _activeIssueID = _issues.length > 0 ? _issues[0].id : null;
+         function hideLayer() {
+           throttledRedraw.cancel();
+           editOff();
+         }
 
-               var containers = selection.selectAll('.issue-container')
-                   .data(_issues, function(d) { return d.id; });
+         function editOn() {
+           layer.style('display', 'block');
+         }
 
-               // Exit
-               containers.exit()
-                   .remove();
+         function editOff() {
+           layer.selectAll('.icon-sign').remove();
+           layer.style('display', 'none');
+         }
 
-               // Enter
-               var containersEnter = containers.enter()
-                   .append('div')
-                   .attr('class', 'issue-container');
+         function click(d3_event, d) {
+           var service = getService();
+           if (!service) return;
+           context.map().centerEase(d.loc);
+           var selectedImageKey = service.getSelectedImageKey();
+           var imageKey;
+           var highlightedDetection; // Pick one of the images the sign was detected in,
+           // preference given to an image already selected.
 
+           d.detections.forEach(function (detection) {
+             if (!imageKey || selectedImageKey === detection.image_key) {
+               imageKey = detection.image_key;
+               highlightedDetection = detection;
+             }
+           });
 
-               var itemsEnter = containersEnter
-                   .append('div')
-                   .attr('class', function(d) { return 'issue severity-' + d.severity; })
-                   .on('mouseover.highlight', function(d) {
-                       // don't hover-highlight the selected entity
-                       var ids = d.entityIds
-                           .filter(function(e) { return _entityIDs.indexOf(e) === -1; });
-
-                       utilHighlightEntities(ids, true, context);
-                   })
-                   .on('mouseout.highlight', function(d) {
-                       var ids = d.entityIds
-                           .filter(function(e) { return _entityIDs.indexOf(e) === -1; });
-
-                       utilHighlightEntities(ids, false, context);
-                   });
+           if (imageKey === selectedImageKey) {
+             service.highlightDetection(highlightedDetection).selectImage(context, imageKey);
+           } else {
+             service.ensureViewerLoaded(context).then(function () {
+               service.highlightDetection(highlightedDetection).selectImage(context, imageKey).showViewer(context);
+             });
+           }
+         }
 
-               var labelsEnter = itemsEnter
-                   .append('div')
-                   .attr('class', 'issue-label')
-                   .on('click', function(d) {
+         function filterData(detectedFeatures) {
+           var service = getService();
+           var fromDate = context.photos().fromDate();
+           var toDate = context.photos().toDate();
+           var usernames = context.photos().usernames();
 
-                       makeActiveIssue(d.id); // expand only the clicked item
+           if (fromDate) {
+             var fromTimestamp = new Date(fromDate).getTime();
+             detectedFeatures = detectedFeatures.filter(function (feature) {
+               return new Date(feature.last_seen_at).getTime() >= fromTimestamp;
+             });
+           }
 
-                       var extent = d.extent(context.graph());
-                       if (extent) {
-                           var setZoom = Math.max(context.map().zoom(), 19);
-                           context.map().unobscuredCenterZoomEase(extent.center(), setZoom);
-                       }
-                   });
+           if (toDate) {
+             var toTimestamp = new Date(toDate).getTime();
+             detectedFeatures = detectedFeatures.filter(function (feature) {
+               return new Date(feature.first_seen_at).getTime() <= toTimestamp;
+             });
+           }
 
-               var textEnter = labelsEnter
-                   .append('span')
-                   .attr('class', 'issue-text');
-
-               textEnter
-                   .append('span')
-                   .attr('class', 'issue-icon')
-                   .each(function(d) {
-                       var iconName = '#iD-icon-' + (d.severity === 'warning' ? 'alert' : 'error');
-                       select(this)
-                           .call(svgIcon(iconName));
-                   });
+           if (usernames && service) {
+             detectedFeatures = detectedFeatures.filter(function (feature) {
+               return feature.detections.some(function (detection) {
+                 var imageKey = detection.image_key;
+                 var image = service.cachedImage(imageKey);
+                 return image && usernames.indexOf(image.captured_by) !== -1;
+               });
+             });
+           }
 
-               textEnter
-                   .append('span')
-                   .attr('class', 'issue-message');
-
-
-               var infoButton = labelsEnter
-                   .append('button')
-                   .attr('class', 'issue-info-button')
-                   .attr('title', _t('icons.information'))
-                   .attr('tabindex', -1)
-                   .call(svgIcon('#iD-icon-inspect'));
-
-               infoButton
-                   .on('click', function () {
-                       event.stopPropagation();
-                       event.preventDefault();
-                       this.blur();    // avoid keeping focus on the button - #4641
-
-                       var container = select(this.parentNode.parentNode.parentNode);
-                       var info = container.selectAll('.issue-info');
-                       var isExpanded = info.classed('expanded');
-
-                       if (isExpanded) {
-                           info
-                               .transition()
-                               .duration(200)
-                               .style('max-height', '0px')
-                               .style('opacity', '0')
-                               .on('end', function () {
-                                   info.classed('expanded', false);
-                               });
-                       } else {
-                           info
-                               .classed('expanded', true)
-                               .transition()
-                               .duration(200)
-                               .style('max-height', '200px')
-                               .style('opacity', '1')
-                               .on('end', function () {
-                                   info.style('max-height', null);
-                               });
-                       }
-                   });
+           return detectedFeatures;
+         }
 
-               itemsEnter
-                   .append('ul')
-                   .attr('class', 'issue-fix-list');
+         function update() {
+           var service = getService();
+           var data = service ? service.signs(projection) : [];
+           data = filterData(data);
+           var selectedImageKey = service.getSelectedImageKey();
+           var transform = svgPointTransform(projection);
+           var signs = layer.selectAll('.icon-sign').data(data, function (d) {
+             return d.key;
+           }); // exit
+
+           signs.exit().remove(); // enter
+
+           var enter = signs.enter().append('g').attr('class', 'icon-sign icon-detected').on('click', click);
+           enter.append('use').attr('width', '24px').attr('height', '24px').attr('x', '-12px').attr('y', '-12px').attr('xlink:href', function (d) {
+             return '#' + d.value;
+           });
+           enter.append('rect').attr('width', '24px').attr('height', '24px').attr('x', '-12px').attr('y', '-12px'); // update
 
-               containersEnter
-                   .append('div')
-                   .attr('class', 'issue-info')
-                   .style('max-height', '0')
-                   .style('opacity', '0')
-                   .each(function(d) {
-                       if (typeof d.reference === 'function') {
-                           select(this)
-                               .call(d.reference);
-                       } else {
-                           select(this)
-                               .text(_t('inspector.no_documentation_key'));
-                       }
-                   });
+           signs.merge(enter).attr('transform', transform).classed('currentView', function (d) {
+             return d.detections.some(function (detection) {
+               return detection.image_key === selectedImageKey;
+             });
+           }).sort(function (a, b) {
+             var aSelected = a.detections.some(function (detection) {
+               return detection.image_key === selectedImageKey;
+             });
+             var bSelected = b.detections.some(function (detection) {
+               return detection.image_key === selectedImageKey;
+             });
 
+             if (aSelected === bSelected) {
+               return b.loc[1] - a.loc[1]; // sort Y
+             } else if (aSelected) {
+               return 1;
+             }
 
-               // Update
-               containers = containers
-                   .merge(containersEnter)
-                   .classed('active', function(d) { return d.id === _activeIssueID; });
+             return -1;
+           });
+         }
 
-               containers.selectAll('.issue-message')
-                   .text(function(d) {
-                       return d.message(context);
-                   });
+         function drawSigns(selection) {
+           var enabled = svgMapillarySigns.enabled;
+           var service = getService();
+           layer = selection.selectAll('.layer-mapillary-signs').data(service ? [0] : []);
+           layer.exit().remove();
+           layer = layer.enter().append('g').attr('class', 'layer-mapillary-signs layer-mapillary-detections').style('display', enabled ? 'block' : 'none').merge(layer);
 
-               // fixes
-               var fixLists = containers.selectAll('.issue-fix-list');
+           if (enabled) {
+             if (service && ~~context.map().zoom() >= minZoom) {
+               editOn();
+               update();
+               service.loadSigns(projection);
+               service.showSignDetections(true);
+             } else {
+               editOff();
+             }
+           } else if (service) {
+             service.showSignDetections(false);
+           }
+         }
 
-               var fixes = fixLists.selectAll('.issue-fix-item')
-                   .data(function(d) { return d.fixes ? d.fixes(context) : []; }, function(fix) { return fix.id; });
+         drawSigns.enabled = function (_) {
+           if (!arguments.length) return svgMapillarySigns.enabled;
+           svgMapillarySigns.enabled = _;
 
-               fixes.exit()
-                   .remove();
+           if (svgMapillarySigns.enabled) {
+             showLayer();
+             context.photos().on('change.mapillary_signs', update);
+           } else {
+             hideLayer();
+             context.photos().on('change.mapillary_signs', null);
+           }
 
-               var fixesEnter = fixes.enter()
-                   .append('li')
-                   .attr('class', 'issue-fix-item')
-                   .on('click', function(d) {
-                       // not all fixes are actionable
-                       if (!select(this).classed('actionable') || !d.onClick) return;
+           dispatch.call('change');
+           return this;
+         };
 
-                       // Don't run another fix for this issue within a second of running one
-                       // (Necessary for "Select a feature type" fix. Most fixes should only ever run once)
-                       if (d.issue.dateLastRanFix && new Date() - d.issue.dateLastRanFix < 1000) return;
-                       d.issue.dateLastRanFix = new Date();
+         drawSigns.supported = function () {
+           return !!getService();
+         };
 
-                       // remove hover-highlighting
-                       utilHighlightEntities(d.issue.entityIds.concat(d.entityIds), false, context);
+         init();
+         return drawSigns;
+       }
 
-                       new Promise(function(resolve, reject) {
-                           d.onClick(context, resolve, reject);
-                           if (d.onClick.length <= 1) {
-                               // if the fix doesn't take any completion parameters then consider it resolved
-                               resolve();
-                           }
-                       })
-                       .then(function() {
-                           // revalidate whenever the fix has finished running successfully
-                           context.validator().validate();
-                       });
-                   })
-                   .on('mouseover.highlight', function(d) {
-                       utilHighlightEntities(d.entityIds, true, context);
-                   })
-                   .on('mouseout.highlight', function(d) {
-                       utilHighlightEntities(d.entityIds, false, context);
-                   });
+       function svgMapillaryMapFeatures(projection, context, dispatch) {
+         var throttledRedraw = throttle(function () {
+           dispatch.call('change');
+         }, 1000);
 
-               fixesEnter
-                   .append('span')
-                   .attr('class', 'fix-icon')
-                   .each(function(d) {
-                       var iconName = d.icon || 'iD-icon-wrench';
-                       if (iconName.startsWith('maki')) {
-                           iconName += '-15';
-                       }
-                       select(this).call(svgIcon('#' + iconName));
-                   });
+         var minZoom = 12;
+         var layer = select(null);
 
-               fixesEnter
-                   .append('span')
-                   .attr('class', 'fix-message')
-                   .text(function(d) { return d.title; });
-
-               fixesEnter.merge(fixes)
-                   .classed('actionable', function(d) {
-                       return d.onClick;
-                   })
-                   .attr('title', function(d) {
-                       if (d.disabledReason) {
-                           return d.disabledReason;
-                       }
-                       return null;
-                   });
-           }
+         var _mapillary;
 
-           section.entityIDs = function(val) {
-               if (!arguments.length) return _entityIDs;
-               if (!_entityIDs || !val || !utilArrayIdentical(_entityIDs, val)) {
-                   _entityIDs = val;
-                   _activeIssueID = null;
-                   reloadIssues();
-               }
-               return section;
-           };
+         function init() {
+           if (svgMapillaryMapFeatures.initialized) return; // run once
 
-           return section;
-       }
+           svgMapillaryMapFeatures.enabled = false;
+           svgMapillaryMapFeatures.initialized = true;
+         }
 
-       function uiPresetIcon() {
-         let _preset;
-         let _geometry;
-         let _sizeClass = 'medium';
+         function getService() {
+           if (services.mapillary && !_mapillary) {
+             _mapillary = services.mapillary;
 
+             _mapillary.event.on('loadedMapFeatures', throttledRedraw);
+           } else if (!services.mapillary && _mapillary) {
+             _mapillary = null;
+           }
 
-         function isSmall() {
-           return _sizeClass === 'small';
+           return _mapillary;
          }
 
+         function showLayer() {
+           var service = getService();
+           if (!service) return;
+           service.loadObjectResources(context);
+           editOn();
+         }
 
-         function presetIcon(selection) {
-           selection.each(render);
+         function hideLayer() {
+           throttledRedraw.cancel();
+           editOff();
          }
 
+         function editOn() {
+           layer.style('display', 'block');
+         }
 
-         function getIcon(p, geom) {
-           if (isSmall() && p.isFallback && p.isFallback())
-             return 'iD-icon-' + p.id;
-           else if (p.icon)
-             return p.icon;
-           else if (geom === 'line')
-             return 'iD-other-line';
-           else if (geom === 'vertex')
-             return p.isFallback() ? '' : 'temaki-vertex';
-           else if (isSmall() && geom === 'point')
-             return '';
-           else
-             return 'maki-marker-stroked';
+         function editOff() {
+           layer.selectAll('.icon-map-feature').remove();
+           layer.style('display', 'none');
          }
 
+         function click(d3_event, d) {
+           var service = getService();
+           if (!service) return;
+           context.map().centerEase(d.loc);
+           var selectedImageKey = service.getSelectedImageKey();
+           var imageKey;
+           var highlightedDetection; // Pick one of the images the map feature was detected in,
+           // preference given to an image already selected.
 
-         function renderPointBorder(enter) {
-           const w = 40;
-           const h = 40;
+           d.detections.forEach(function (detection) {
+             if (!imageKey || selectedImageKey === detection.image_key) {
+               imageKey = detection.image_key;
+               highlightedDetection = detection;
+             }
+           });
 
-           enter
-             .append('svg')
-             .attr('class', 'preset-icon-fill preset-icon-point-border')
-             .attr('width', w)
-             .attr('height', h)
-             .attr('viewBox', `0 0 ${w} ${h}`)
-             .append('path')
-             .attr('transform', 'translate(11.5, 8)')
-             .attr('d', 'M 17,8 C 17,13 11,21 8.5,23.5 C 6,21 0,13 0,8 C 0,4 4,-0.5 8.5,-0.5 C 13,-0.5 17,4 17,8 z');
+           if (imageKey === selectedImageKey) {
+             service.highlightDetection(highlightedDetection).selectImage(context, imageKey);
+           } else {
+             service.ensureViewerLoaded(context).then(function () {
+               service.highlightDetection(highlightedDetection).selectImage(context, imageKey).showViewer(context);
+             });
+           }
          }
 
+         function filterData(detectedFeatures) {
+           var service = getService();
+           var fromDate = context.photos().fromDate();
+           var toDate = context.photos().toDate();
+           var usernames = context.photos().usernames();
 
-         function renderCircleFill(fillEnter) {
-           const w = 60;
-           const h = 60;
-           const d = 40;
-
-           fillEnter
-             .append('svg')
-             .attr('class', 'preset-icon-fill preset-icon-fill-vertex')
-             .attr('width', w)
-             .attr('height', h)
-             .attr('viewBox', `0 0 ${w} ${h}`)
-             .append('circle')
-             .attr('cx', w / 2)
-             .attr('cy', h / 2)
-             .attr('r', d / 2);
-         }
+           if (fromDate) {
+             var fromTimestamp = new Date(fromDate).getTime();
+             detectedFeatures = detectedFeatures.filter(function (feature) {
+               return new Date(feature.last_seen_at).getTime() >= fromTimestamp;
+             });
+           }
 
+           if (toDate) {
+             var toTimestamp = new Date(toDate).getTime();
+             detectedFeatures = detectedFeatures.filter(function (feature) {
+               return new Date(feature.first_seen_at).getTime() <= toTimestamp;
+             });
+           }
 
-         function renderSquareFill(fillEnter) {
-           const d = isSmall() ? 40 : 60;
-           const w = d;
-           const h = d;
-           const l = d * 2/3;
-           const c1 = (w-l) / 2;
-           const c2 = c1 + l;
+           if (usernames && service) {
+             detectedFeatures = detectedFeatures.filter(function (feature) {
+               return feature.detections.some(function (detection) {
+                 var imageKey = detection.image_key;
+                 var image = service.cachedImage(imageKey);
+                 return image && usernames.indexOf(image.captured_by) !== -1;
+               });
+             });
+           }
 
-           fillEnter = fillEnter
-             .append('svg')
-             .attr('class', 'preset-icon-fill preset-icon-fill-area')
-             .attr('width', w)
-             .attr('height', h)
-             .attr('viewBox', `0 0 ${w} ${h}`);
+           return detectedFeatures;
+         }
 
-           ['fill', 'stroke'].forEach(klass => {
-             fillEnter
-               .append('path')
-               .attr('d', `M${c1} ${c1} L${c1} ${c2} L${c2} ${c2} L${c2} ${c1} Z`)
-               .attr('class', `line area ${klass}`);
+         function update() {
+           var service = getService();
+           var data = service ? service.mapFeatures(projection) : [];
+           data = filterData(data);
+           var selectedImageKey = service && service.getSelectedImageKey();
+           var transform = svgPointTransform(projection);
+           var mapFeatures = layer.selectAll('.icon-map-feature').data(data, function (d) {
+             return d.key;
+           }); // exit
+
+           mapFeatures.exit().remove(); // enter
+
+           var enter = mapFeatures.enter().append('g').attr('class', 'icon-map-feature icon-detected').on('click', click);
+           enter.append('title').text(function (d) {
+             var id = d.value.replace(/--/g, '.').replace(/-/g, '_');
+             return _t('mapillary_map_features.' + id);
            });
+           enter.append('use').attr('width', '24px').attr('height', '24px').attr('x', '-12px').attr('y', '-12px').attr('xlink:href', function (d) {
+             if (d.value === 'object--billboard') {
+               // no billboard icon right now, so use the advertisement icon
+               return '#object--sign--advertisement';
+             }
 
-           const rVertex = 2.5;
-           [[c1, c1], [c1, c2], [c2, c2], [c2, c1]].forEach(point => {
-             fillEnter
-               .append('circle')
-               .attr('class', 'vertex')
-               .attr('cx', point[0])
-               .attr('cy', point[1])
-               .attr('r', rVertex);
+             return '#' + d.value;
            });
+           enter.append('rect').attr('width', '24px').attr('height', '24px').attr('x', '-12px').attr('y', '-12px'); // update
 
-           if (!isSmall()) {
-             const rMidpoint = 1.25;
-             [[c1, w/2], [c2, w/2], [h/2, c1], [h/2, c2]].forEach(point => {
-               fillEnter
-                 .append('circle')
-                 .attr('class', 'midpoint')
-                 .attr('cx', point[0])
-                 .attr('cy', point[1])
-                 .attr('r', rMidpoint);
-             });
-           }
-         }
-
-
-         function renderLine(lineEnter) {
-           const d = isSmall() ? 40 : 60;
-           // draw the line parametrically
-           const w = d;
-           const h = d;
-           const y = Math.round(d * 0.72);
-           const l = Math.round(d * 0.6);
-           const r = 2.5;
-           const x1 = (w - l) / 2;
-           const x2 = x1 + l;
-
-           lineEnter = lineEnter
-             .append('svg')
-             .attr('class', 'preset-icon-line')
-             .attr('width', w)
-             .attr('height', h)
-             .attr('viewBox', `0 0 ${w} ${h}`);
-
-           ['casing', 'stroke'].forEach(klass => {
-             lineEnter
-               .append('path')
-               .attr('d', `M${x1} ${y} L${x2} ${y}`)
-               .attr('class', `line ${klass}`);
-           });
-
-           [[x1-1, y], [x2+1, y]].forEach(point => {
-             lineEnter
-               .append('circle')
-               .attr('class', 'vertex')
-               .attr('cx', point[0])
-               .attr('cy', point[1])
-               .attr('r', r);
-           });
-         }
-
-
-         function renderRoute(routeEnter) {
-           const d = isSmall() ? 40 : 60;
-           // draw the route parametrically
-           const w = d;
-           const h = d;
-           const y1 = Math.round(d * 0.80);
-           const y2 = Math.round(d * 0.68);
-           const l = Math.round(d * 0.6);
-           const r = 2;
-           const x1 = (w - l) / 2;
-           const x2 = x1 + l / 3;
-           const x3 = x2 + l / 3;
-           const x4 = x3 + l / 3;
-
-           routeEnter = routeEnter
-             .append('svg')
-             .attr('class', 'preset-icon-route')
-             .attr('width', w)
-             .attr('height', h)
-             .attr('viewBox', `0 0 ${w} ${h}`);
-
-           ['casing', 'stroke'].forEach(klass => {
-             routeEnter
-               .append('path')
-               .attr('d', `M${x1} ${y1} L${x2} ${y2}`)
-               .attr('class', `segment0 line ${klass}`);
-             routeEnter
-               .append('path')
-               .attr('d', `M${x2} ${y2} L${x3} ${y1}`)
-               .attr('class', `segment1 line ${klass}`);
-             routeEnter
-               .append('path')
-               .attr('d', `M${x3} ${y1} L${x4} ${y2}`)
-               .attr('class', `segment2 line ${klass}`);
-           });
-
-           [[x1, y1], [x2, y2], [x3, y1], [x4, y2]].forEach(point => {
-             routeEnter
-               .append('circle')
-               .attr('class', 'vertex')
-               .attr('cx', point[0])
-               .attr('cy', point[1])
-               .attr('r', r);
-           });
-         }
-
-
-         // Route icons are drawn with a zigzag annotation underneath:
-         //     o   o
-         //    / \ /
-         //   o   o
-         // This dataset defines the styles that are used to draw the zigzag segments.
-         const routeSegments = {
-           bicycle: ['highway/cycleway', 'highway/cycleway', 'highway/cycleway'],
-           bus: ['highway/unclassified', 'highway/secondary', 'highway/primary'],
-           trolleybus: ['highway/unclassified', 'highway/secondary', 'highway/primary'],
-           detour: ['highway/tertiary', 'highway/residential', 'highway/unclassified'],
-           ferry: ['route/ferry', 'route/ferry', 'route/ferry'],
-           foot: ['highway/footway', 'highway/footway', 'highway/footway'],
-           hiking: ['highway/path', 'highway/path', 'highway/path'],
-           horse: ['highway/bridleway', 'highway/bridleway', 'highway/bridleway'],
-           light_rail: ['railway/light_rail', 'railway/light_rail', 'railway/light_rail'],
-           monorail: ['railway/monorail', 'railway/monorail', 'railway/monorail'],
-           pipeline: ['man_made/pipeline', 'man_made/pipeline', 'man_made/pipeline'],
-           piste: ['piste/downhill', 'piste/hike', 'piste/nordic'],
-           power: ['power/line', 'power/line', 'power/line'],
-           road: ['highway/secondary', 'highway/primary', 'highway/trunk'],
-           subway: ['railway/subway', 'railway/subway', 'railway/subway'],
-           train: ['railway/rail', 'railway/rail', 'railway/rail'],
-           tram: ['railway/tram', 'railway/tram', 'railway/tram'],
-           waterway: ['waterway/stream', 'waterway/stream', 'waterway/stream']
-         };
+           mapFeatures.merge(enter).attr('transform', transform).classed('currentView', function (d) {
+             return d.detections.some(function (detection) {
+               return detection.image_key === selectedImageKey;
+             });
+           }).sort(function (a, b) {
+             var aSelected = a.detections.some(function (detection) {
+               return detection.image_key === selectedImageKey;
+             });
+             var bSelected = b.detections.some(function (detection) {
+               return detection.image_key === selectedImageKey;
+             });
 
+             if (aSelected === bSelected) {
+               return b.loc[1] - a.loc[1]; // sort Y
+             } else if (aSelected) {
+               return 1;
+             }
 
-         function render() {
-           let p = _preset.apply(this, arguments);
-           let geom = _geometry ? _geometry.apply(this, arguments) : null;
-           if (geom === 'relation' && p.tags && ((p.tags.type === 'route' && p.tags.route && routeSegments[p.tags.route]) || p.tags.type === 'waterway')) {
-             geom = 'route';
-           }
+             return -1;
+           });
+         }
 
-           const showThirdPartyIcons = corePreferences('preferences.privacy.thirdpartyicons') || 'true';
-           const isFallback = isSmall() && p.isFallback && p.isFallback();
-           const imageURL = (showThirdPartyIcons === 'true') && p.imageURL;
-           const picon = getIcon(p, geom);
-           const isMaki = picon && /^maki-/.test(picon);
-           const isTemaki = picon && /^temaki-/.test(picon);
-           const isFa = picon && /^fa[srb]-/.test(picon);
-           const isTnp = picon && /^tnp-/.test(picon);
-           const isiDIcon = picon && !(isMaki || isTemaki || isFa || isTnp);
-           const isCategory = !p.setTags;
-           const drawPoint = picon && geom === 'point' && isSmall() && !isFallback;
-           const drawVertex = picon !== null && geom === 'vertex' && (!isSmall() || !isFallback);
-           const drawLine = picon && geom === 'line' && !isFallback && !isCategory;
-           const drawArea = picon && geom === 'area' && !isFallback;
-           const drawRoute = picon && geom === 'route';
-           const isFramed = (drawVertex || drawArea || drawLine || drawRoute);
-
-           let tags = !isCategory ? p.setTags({}, geom) : {};
-           for (let k in tags) {
-             if (tags[k] === '*') {
-               tags[k] = 'yes';
+         function drawMapFeatures(selection) {
+           var enabled = svgMapillaryMapFeatures.enabled;
+           var service = getService();
+           layer = selection.selectAll('.layer-mapillary-map-features').data(service ? [0] : []);
+           layer.exit().remove();
+           layer = layer.enter().append('g').attr('class', 'layer-mapillary-map-features layer-mapillary-detections').style('display', enabled ? 'block' : 'none').merge(layer);
+
+           if (enabled) {
+             if (service && ~~context.map().zoom() >= minZoom) {
+               editOn();
+               update();
+               service.loadMapFeatures(projection);
+               service.showFeatureDetections(true);
+             } else {
+               editOff();
              }
+           } else if (service) {
+             service.showFeatureDetections(false);
+           }
+         }
+
+         drawMapFeatures.enabled = function (_) {
+           if (!arguments.length) return svgMapillaryMapFeatures.enabled;
+           svgMapillaryMapFeatures.enabled = _;
+
+           if (svgMapillaryMapFeatures.enabled) {
+             showLayer();
+             context.photos().on('change.mapillary_map_features', update);
+           } else {
+             hideLayer();
+             context.photos().on('change.mapillary_map_features', null);
            }
 
-           let tagClasses = svgTagClasses().getClassesString(tags, '');
-           let selection = select(this);
+           dispatch.call('change');
+           return this;
+         };
 
-           let container = selection.selectAll('.preset-icon-container')
-             .data([0]);
+         drawMapFeatures.supported = function () {
+           return !!getService();
+         };
 
-           container = container.enter()
-             .append('div')
-             .attr('class', `preset-icon-container ${_sizeClass}`)
-             .merge(container);
+         init();
+         return drawMapFeatures;
+       }
 
-           container
-             .classed('showing-img', !!imageURL)
-             .classed('fallback', isFallback);
+       function svgOpenstreetcamImages(projection, context, dispatch) {
+         var throttledRedraw = throttle(function () {
+           dispatch.call('change');
+         }, 1000);
 
+         var minZoom = 12;
+         var minMarkerZoom = 16;
+         var minViewfieldZoom = 18;
+         var layer = select(null);
 
-           let pointBorder = container.selectAll('.preset-icon-point-border')
-             .data(drawPoint ? [0] : []);
+         var _openstreetcam;
 
-           pointBorder.exit()
-             .remove();
+         function init() {
+           if (svgOpenstreetcamImages.initialized) return; // run once
 
-           let pointBorderEnter = pointBorder.enter();
-           renderPointBorder(pointBorderEnter);
-           pointBorder = pointBorderEnter.merge(pointBorder);
+           svgOpenstreetcamImages.enabled = false;
+           svgOpenstreetcamImages.initialized = true;
+         }
 
+         function getService() {
+           if (services.openstreetcam && !_openstreetcam) {
+             _openstreetcam = services.openstreetcam;
 
-           let vertexFill = container.selectAll('.preset-icon-fill-vertex')
-             .data(drawVertex ? [0] : []);
+             _openstreetcam.event.on('loadedImages', throttledRedraw);
+           } else if (!services.openstreetcam && _openstreetcam) {
+             _openstreetcam = null;
+           }
 
-           vertexFill.exit()
-             .remove();
+           return _openstreetcam;
+         }
 
-           let vertexFillEnter = vertexFill.enter();
-           renderCircleFill(vertexFillEnter);
-           vertexFill = vertexFillEnter.merge(vertexFill);
+         function showLayer() {
+           var service = getService();
+           if (!service) return;
+           editOn();
+           layer.style('opacity', 0).transition().duration(250).style('opacity', 1).on('end', function () {
+             dispatch.call('change');
+           });
+         }
 
+         function hideLayer() {
+           throttledRedraw.cancel();
+           layer.transition().duration(250).style('opacity', 0).on('end', editOff);
+         }
 
-           let fill = container.selectAll('.preset-icon-fill-area')
-             .data(drawArea ? [0] : []);
+         function editOn() {
+           layer.style('display', 'block');
+         }
 
-           fill.exit()
-             .remove();
+         function editOff() {
+           layer.selectAll('.viewfield-group').remove();
+           layer.style('display', 'none');
+         }
 
-           let fillEnter = fill.enter();
-           renderSquareFill(fillEnter);
-           fill = fillEnter.merge(fill);
+         function click(d3_event, d) {
+           var service = getService();
+           if (!service) return;
+           service.ensureViewerLoaded(context).then(function () {
+             service.selectImage(context, d.key).showViewer(context);
+           });
+           context.map().centerEase(d.loc);
+         }
 
-           fill.selectAll('path.stroke')
-             .attr('class', `area stroke ${tagClasses}`);
-           fill.selectAll('path.fill')
-             .attr('class', `area fill ${tagClasses}`);
+         function mouseover(d3_event, d) {
+           var service = getService();
+           if (service) service.setStyles(context, d);
+         }
 
+         function mouseout() {
+           var service = getService();
+           if (service) service.setStyles(context, null);
+         }
 
-           let line = container.selectAll('.preset-icon-line')
-             .data(drawLine ? [0] : []);
+         function transform(d) {
+           var t = svgPointTransform(projection)(d);
 
-           line.exit()
-             .remove();
+           if (d.ca) {
+             t += ' rotate(' + Math.floor(d.ca) + ',0,0)';
+           }
 
-           let lineEnter = line.enter();
-           renderLine(lineEnter);
-           line = lineEnter.merge(line);
+           return t;
+         }
 
-           line.selectAll('path.stroke')
-             .attr('class', `line stroke ${tagClasses}`);
-           line.selectAll('path.casing')
-             .attr('class', `line casing ${tagClasses}`);
+         function filterImages(images) {
+           var fromDate = context.photos().fromDate();
+           var toDate = context.photos().toDate();
+           var usernames = context.photos().usernames();
 
+           if (fromDate) {
+             var fromTimestamp = new Date(fromDate).getTime();
+             images = images.filter(function (item) {
+               return new Date(item.captured_at).getTime() >= fromTimestamp;
+             });
+           }
 
-           let route = container.selectAll('.preset-icon-route')
-             .data(drawRoute ? [0] : []);
+           if (toDate) {
+             var toTimestamp = new Date(toDate).getTime();
+             images = images.filter(function (item) {
+               return new Date(item.captured_at).getTime() <= toTimestamp;
+             });
+           }
 
-           route.exit()
-             .remove();
+           if (usernames) {
+             images = images.filter(function (item) {
+               return usernames.indexOf(item.captured_by) !== -1;
+             });
+           }
 
-           let routeEnter = route.enter();
-           renderRoute(routeEnter);
-           route = routeEnter.merge(route);
+           return images;
+         }
 
-           if (drawRoute) {
-             let routeType = p.tags.type === 'waterway' ? 'waterway' : p.tags.route;
-             const segmentPresetIDs = routeSegments[routeType];
-             for (let i in segmentPresetIDs) {
-               const segmentPreset = _mainPresetIndex.item(segmentPresetIDs[i]);
-               const segmentTagClasses = svgTagClasses().getClassesString(segmentPreset.tags, '');
-               route.selectAll(`path.stroke.segment${i}`)
-                 .attr('class', `segment${i} line stroke ${segmentTagClasses}`);
-               route.selectAll(`path.casing.segment${i}`)
-                 .attr('class', `segment${i} line casing ${segmentTagClasses}`);
-             }
+         function filterSequences(sequences) {
+           var fromDate = context.photos().fromDate();
+           var toDate = context.photos().toDate();
+           var usernames = context.photos().usernames();
+
+           if (fromDate) {
+             var fromTimestamp = new Date(fromDate).getTime();
+             sequences = sequences.filter(function (image) {
+               return new Date(image.properties.captured_at).getTime() >= fromTimestamp;
+             });
            }
 
+           if (toDate) {
+             var toTimestamp = new Date(toDate).getTime();
+             sequences = sequences.filter(function (image) {
+               return new Date(image.properties.captured_at).getTime() <= toTimestamp;
+             });
+           }
 
-           let icon = container.selectAll('.preset-icon')
-             .data(picon ? [0] : []);
+           if (usernames) {
+             sequences = sequences.filter(function (image) {
+               return usernames.indexOf(image.properties.captured_by) !== -1;
+             });
+           }
 
-           icon.exit()
-             .remove();
+           return sequences;
+         }
 
-           icon = icon.enter()
-             .append('div')
-             .attr('class', 'preset-icon')
-             .call(svgIcon(''))
-             .merge(icon);
+         function update() {
+           var viewer = context.container().select('.photoviewer');
+           var selected = viewer.empty() ? undefined : viewer.datum();
+           var z = ~~context.map().zoom();
+           var showMarkers = z >= minMarkerZoom;
+           var showViewfields = z >= minViewfieldZoom;
+           var service = getService();
+           var sequences = [];
+           var images = [];
 
-           icon
-             .attr('class', 'preset-icon ' + (geom ? geom + '-geom' : ''))
-             .classed('framed', isFramed)
-             .classed('preset-icon-iD', isiDIcon);
+           if (context.photos().showsFlat()) {
+             sequences = service ? service.sequences(projection) : [];
+             images = service && showMarkers ? service.images(projection) : [];
+             sequences = filterSequences(sequences);
+             images = filterImages(images);
+           }
 
-           icon.selectAll('svg')
-             .attr('class', 'icon ' + picon + ' ' + (!isiDIcon && geom !== 'line'  ? '' : tagClasses));
+           var traces = layer.selectAll('.sequences').selectAll('.sequence').data(sequences, function (d) {
+             return d.properties.key;
+           }); // exit
 
-           icon.selectAll('use')
-             .attr('href', '#' + picon + (isMaki ? (isSmall() && geom === 'point' ? '-11' : '-15') : ''));
+           traces.exit().remove(); // enter/update
 
-           let imageIcon = container.selectAll('img.image-icon')
-             .data(imageURL ? [0] : []);
+           traces = traces.enter().append('path').attr('class', 'sequence').merge(traces).attr('d', svgPath(projection).geojson);
+           var groups = layer.selectAll('.markers').selectAll('.viewfield-group').data(images, function (d) {
+             return d.key;
+           }); // exit
 
-           imageIcon.exit()
-             .remove();
+           groups.exit().remove(); // enter
 
-           imageIcon = imageIcon.enter()
-             .append('img')
-             .attr('class', 'image-icon')
-             .on('load', () => container.classed('showing-img', true) )
-             .on('error', () => container.classed('showing-img', false) )
-             .merge(imageIcon);
+           var groupsEnter = groups.enter().append('g').attr('class', 'viewfield-group').on('mouseenter', mouseover).on('mouseleave', mouseout).on('click', click);
+           groupsEnter.append('g').attr('class', 'viewfield-scale'); // update
 
-           imageIcon
-             .attr('src', imageURL);
+           var markers = groups.merge(groupsEnter).sort(function (a, b) {
+             return a === selected ? 1 : b === selected ? -1 : b.loc[1] - a.loc[1]; // sort Y
+           }).attr('transform', transform).select('.viewfield-scale');
+           markers.selectAll('circle').data([0]).enter().append('circle').attr('dx', '0').attr('dy', '0').attr('r', '6');
+           var viewfields = markers.selectAll('.viewfield').data(showViewfields ? [0] : []);
+           viewfields.exit().remove();
+           viewfields.enter() // viewfields may or may not be drawn...
+           .insert('path', 'circle') // but if they are, draw below the circles
+           .attr('class', 'viewfield').attr('transform', 'scale(1.5,1.5),translate(-8, -13)').attr('d', 'M 6,9 C 8,8.4 8,8.4 10,9 L 16,-2 C 12,-5 4,-5 0,-2 z');
          }
 
+         function drawImages(selection) {
+           var enabled = svgOpenstreetcamImages.enabled,
+               service = getService();
+           layer = selection.selectAll('.layer-openstreetcam').data(service ? [0] : []);
+           layer.exit().remove();
+           var layerEnter = layer.enter().append('g').attr('class', 'layer-openstreetcam').style('display', enabled ? 'block' : 'none');
+           layerEnter.append('g').attr('class', 'sequences');
+           layerEnter.append('g').attr('class', 'markers');
+           layer = layerEnter.merge(layer);
 
-         presetIcon.preset = function(val) {
-           if (!arguments.length) return _preset;
-           _preset = utilFunctor(val);
-           return presetIcon;
-         };
+           if (enabled) {
+             if (service && ~~context.map().zoom() >= minZoom) {
+               editOn();
+               update();
+               service.loadImages(projection);
+             } else {
+               editOff();
+             }
+           }
+         }
 
+         drawImages.enabled = function (_) {
+           if (!arguments.length) return svgOpenstreetcamImages.enabled;
+           svgOpenstreetcamImages.enabled = _;
 
-         presetIcon.geometry = function(val) {
-           if (!arguments.length) return _geometry;
-           _geometry = utilFunctor(val);
-           return presetIcon;
-         };
+           if (svgOpenstreetcamImages.enabled) {
+             showLayer();
+             context.photos().on('change.openstreetcam_images', update);
+           } else {
+             hideLayer();
+             context.photos().on('change.openstreetcam_images', null);
+           }
 
+           dispatch.call('change');
+           return this;
+         };
 
-         presetIcon.sizeClass = function(val) {
-           if (!arguments.length) return _sizeClass;
-           _sizeClass = val;
-           return presetIcon;
+         drawImages.supported = function () {
+           return !!getService();
          };
 
-         return presetIcon;
+         init();
+         return drawImages;
        }
 
-       function uiSectionFeatureType(context) {
-
-           var dispatch$1 = dispatch('choose');
-
-           var _entityIDs = [];
-           var _presets = [];
+       function svgOsm(projection, context, dispatch) {
+         var enabled = true;
 
-           var _tagReference;
+         function drawOsm(selection) {
+           selection.selectAll('.layer-osm').data(['covered', 'areas', 'lines', 'points', 'labels']).enter().append('g').attr('class', function (d) {
+             return 'layer-osm ' + d;
+           });
+           selection.selectAll('.layer-osm.points').selectAll('.points-group').data(['points', 'midpoints', 'vertices', 'turns']).enter().append('g').attr('class', function (d) {
+             return 'points-group ' + d;
+           });
+         }
 
-           var section = uiSection('feature-type', context)
-               .title(_t('inspector.feature_type'))
-               .disclosureContent(renderDisclosureContent);
+         function showLayer() {
+           var layer = context.surface().selectAll('.data-layer.osm');
+           layer.interrupt();
+           layer.classed('disabled', false).style('opacity', 0).transition().duration(250).style('opacity', 1).on('end interrupt', function () {
+             dispatch.call('change');
+           });
+         }
 
-           function renderDisclosureContent(selection) {
+         function hideLayer() {
+           var layer = context.surface().selectAll('.data-layer.osm');
+           layer.interrupt();
+           layer.transition().duration(250).style('opacity', 0).on('end interrupt', function () {
+             layer.classed('disabled', true);
+             dispatch.call('change');
+           });
+         }
 
-               selection.classed('preset-list-item', true);
-               selection.classed('mixed-types', _presets.length > 1);
+         drawOsm.enabled = function (val) {
+           if (!arguments.length) return enabled;
+           enabled = val;
 
-               var presetButtonWrap = selection
-                   .selectAll('.preset-list-button-wrap')
-                   .data([0])
-                   .enter()
-                   .append('div')
-                   .attr('class', 'preset-list-button-wrap');
+           if (enabled) {
+             showLayer();
+           } else {
+             hideLayer();
+           }
 
-               var presetButton = presetButtonWrap
-                   .append('button')
-                   .attr('class', 'preset-list-button preset-reset')
-                   .call(uiTooltip()
-                       .title(_t('inspector.back_tooltip'))
-                       .placement('bottom')
-                   );
+           dispatch.call('change');
+           return this;
+         };
 
-               presetButton.append('div')
-                   .attr('class', 'preset-icon-container');
+         return drawOsm;
+       }
 
-               presetButton
-                   .append('div')
-                   .attr('class', 'label')
-                   .append('div')
-                   .attr('class', 'label-inner');
+       var _notesEnabled = false;
 
-               presetButtonWrap.append('div')
-                   .attr('class', 'accessory-buttons');
+       var _osmService;
 
-               var tagReferenceBodyWrap = selection
-                   .selectAll('.tag-reference-body-wrap')
-                   .data([0]);
+       function svgNotes(projection, context, dispatch$1) {
+         if (!dispatch$1) {
+           dispatch$1 = dispatch('change');
+         }
 
-               tagReferenceBodyWrap = tagReferenceBodyWrap
-                   .enter()
-                   .append('div')
-                   .attr('class', 'tag-reference-body-wrap')
-                   .merge(tagReferenceBodyWrap);
-
-               // update header
-               if (_tagReference) {
-                   selection.selectAll('.preset-list-button-wrap .accessory-buttons')
-                       .style('display', _presets.length === 1 ? null : 'none')
-                       .call(_tagReference.button);
-
-                   tagReferenceBodyWrap
-                       .style('display', _presets.length === 1 ? null : 'none')
-                       .call(_tagReference.body);
-               }
-
-               selection.selectAll('.preset-reset')
-                   .on('click', function() {
-                        dispatch$1.call('choose', this, _presets);
-                   })
-                   .on('pointerdown pointerup mousedown mouseup', function() {
-                       event.preventDefault();
-                       event.stopPropagation();
-                   });
+         var throttledRedraw = throttle(function () {
+           dispatch$1.call('change');
+         }, 1000);
 
-               var geometries = entityGeometries();
-               selection.select('.preset-list-item button')
-                   .call(uiPresetIcon()
-                       .geometry(_presets.length === 1 ? (geometries.length === 1 && geometries[0]) : null)
-                       .preset(_presets.length === 1 ? _presets[0] : _mainPresetIndex.item('point'))
-                   );
+         var minZoom = 12;
+         var touchLayer = select(null);
+         var drawLayer = select(null);
+         var _notesVisible = false;
 
-               // NOTE: split on en-dash, not a hypen (to avoid conflict with hyphenated names)
-               var names = _presets.length === 1 ? _presets[0].name().split(' – ') : [_t('inspector.multiple_types')];
+         function markerPath(selection, klass) {
+           selection.attr('class', klass).attr('transform', 'translate(-8, -22)').attr('d', 'm17.5,0l-15,0c-1.37,0 -2.5,1.12 -2.5,2.5l0,11.25c0,1.37 1.12,2.5 2.5,2.5l3.75,0l0,3.28c0,0.38 0.43,0.6 0.75,0.37l4.87,-3.65l5.62,0c1.37,0 2.5,-1.12 2.5,-2.5l0,-11.25c0,-1.37 -1.12,-2.5 -2.5,-2.5z');
+         } // Loosely-coupled osm service for fetching notes.
 
-               var label = selection.select('.label-inner');
-               var nameparts = label.selectAll('.namepart')
-                   .data(names, function(d) { return d; });
 
-               nameparts.exit()
-                   .remove();
+         function getService() {
+           if (services.osm && !_osmService) {
+             _osmService = services.osm;
 
-               nameparts
-                   .enter()
-                   .append('div')
-                   .attr('class', 'namepart')
-                   .text(function(d) { return d; });
+             _osmService.on('loadedNotes', throttledRedraw);
+           } else if (!services.osm && _osmService) {
+             _osmService = null;
            }
 
-           section.entityIDs = function(val) {
-               if (!arguments.length) return _entityIDs;
-               _entityIDs = val;
-               return section;
-           };
-
-           section.presets = function(val) {
-               if (!arguments.length) return _presets;
+           return _osmService;
+         } // Show the notes
 
-               // don't reload the same preset
-               if (!utilArrayIdentical(val, _presets)) {
-                   _presets = val;
-
-                   var geometries = entityGeometries();
-                   if (_presets.length === 1 && geometries.length) {
-                       _tagReference = uiTagReference(_presets[0].reference(geometries[0]))
-                           .showing(false);
-                   }
-               }
 
-               return section;
-           };
+         function editOn() {
+           if (!_notesVisible) {
+             _notesVisible = true;
+             drawLayer.style('display', 'block');
+           }
+         } // Immediately remove the notes and their touch targets
 
-           function entityGeometries() {
 
-               var counts = {};
+         function editOff() {
+           if (_notesVisible) {
+             _notesVisible = false;
+             drawLayer.style('display', 'none');
+             drawLayer.selectAll('.note').remove();
+             touchLayer.selectAll('.note').remove();
+           }
+         } // Enable the layer.  This shows the notes and transitions them to visible.
 
-               for (var i in _entityIDs) {
-                   var geometry = context.graph().geometry(_entityIDs[i]);
-                   if (!counts[geometry]) counts[geometry] = 0;
-                   counts[geometry] += 1;
-               }
 
-               return Object.keys(counts).sort(function(geom1, geom2) {
-                   return counts[geom2] - counts[geom1];
-               });
-           }
+         function layerOn() {
+           editOn();
+           drawLayer.style('opacity', 0).transition().duration(250).style('opacity', 1).on('end interrupt', function () {
+             dispatch$1.call('change');
+           });
+         } // Disable the layer.  This transitions the layer invisible and then hides the notes.
 
-           return utilRebind(section, dispatch$1, 'on');
-       }
 
-       // This currently only works with the 'restrictions' field
-       // It borrows some code from uiHelp
+         function layerOff() {
+           throttledRedraw.cancel();
+           drawLayer.interrupt();
+           touchLayer.selectAll('.note').remove();
+           drawLayer.transition().duration(250).style('opacity', 0).on('end interrupt', function () {
+             editOff();
+             dispatch$1.call('change');
+           });
+         } // Update the note markers
 
-       function uiFieldHelp(context, fieldName) {
-           var fieldHelp = {};
-           var _inspector = select(null);
-           var _wrap = select(null);
-           var _body = select(null);
-
-           var fieldHelpKeys = {
-               restrictions: [
-                   ['about',[
-                       'about',
-                       'from_via_to',
-                       'maxdist',
-                       'maxvia'
-                   ]],
-                   ['inspecting',[
-                       'about',
-                       'from_shadow',
-                       'allow_shadow',
-                       'restrict_shadow',
-                       'only_shadow',
-                       'restricted',
-                       'only'
-                   ]],
-                   ['modifying',[
-                       'about',
-                       'indicators',
-                       'allow_turn',
-                       'restrict_turn',
-                       'only_turn'
-                   ]],
-                   ['tips',[
-                       'simple',
-                       'simple_example',
-                       'indirect',
-                       'indirect_example',
-                       'indirect_noedit'
-                   ]]
-               ]
-           };
 
-           var fieldHelpHeadings = {};
+         function updateMarkers() {
+           if (!_notesVisible || !_notesEnabled) return;
+           var service = getService();
+           var selectedID = context.selectedNoteID();
+           var data = service ? service.notes(projection) : [];
+           var getTransform = svgPointTransform(projection); // Draw markers..
+
+           var notes = drawLayer.selectAll('.note').data(data, function (d) {
+             return d.status + d.id;
+           }); // exit
+
+           notes.exit().remove(); // enter
+
+           var notesEnter = notes.enter().append('g').attr('class', function (d) {
+             return 'note note-' + d.id + ' ' + d.status;
+           }).classed('new', function (d) {
+             return d.id < 0;
+           });
+           notesEnter.append('ellipse').attr('cx', 0.5).attr('cy', 1).attr('rx', 6.5).attr('ry', 3).attr('class', 'stroke');
+           notesEnter.append('path').call(markerPath, 'shadow');
+           notesEnter.append('use').attr('class', 'note-fill').attr('width', '20px').attr('height', '20px').attr('x', '-8px').attr('y', '-22px').attr('xlink:href', '#iD-icon-note');
+           notesEnter.selectAll('.icon-annotation').data(function (d) {
+             return [d];
+           }).enter().append('use').attr('class', 'icon-annotation').attr('width', '10px').attr('height', '10px').attr('x', '-3px').attr('y', '-19px').attr('xlink:href', function (d) {
+             return '#iD-icon-' + (d.id < 0 ? 'plus' : d.status === 'open' ? 'close' : 'apply');
+           }); // update
+
+           notes.merge(notesEnter).sort(sortY).classed('selected', function (d) {
+             var mode = context.mode();
+             var isMoving = mode && mode.id === 'drag-note'; // no shadows when dragging
+
+             return !isMoving && d.id === selectedID;
+           }).attr('transform', getTransform); // Draw targets..
 
-           var replacements = {
-               distField: _t('restriction.controls.distance'),
-               viaField: _t('restriction.controls.via'),
-               fromShadow: icon('#iD-turn-shadow', 'pre-text shadow from'),
-               allowShadow: icon('#iD-turn-shadow', 'pre-text shadow allow'),
-               restrictShadow: icon('#iD-turn-shadow', 'pre-text shadow restrict'),
-               onlyShadow: icon('#iD-turn-shadow', 'pre-text shadow only'),
-               allowTurn: icon('#iD-turn-yes', 'pre-text turn'),
-               restrictTurn: icon('#iD-turn-no', 'pre-text turn'),
-               onlyTurn: icon('#iD-turn-only', 'pre-text turn')
-           };
+           if (touchLayer.empty()) return;
+           var fillClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
+           var targets = touchLayer.selectAll('.note').data(data, function (d) {
+             return d.id;
+           }); // exit
 
+           targets.exit().remove(); // enter/update
 
-           // For each section, squash all the texts into a single markdown document
-           var docs = fieldHelpKeys[fieldName].map(function(key) {
-               var helpkey = 'help.field.' + fieldName + '.' + key[0];
-               var text = key[1].reduce(function(all, part) {
-                   var subkey = helpkey + '.' + part;
-                   var depth = fieldHelpHeadings[subkey];                     // is this subkey a heading?
-                   var hhh = depth ? Array(depth + 1).join('#') + ' ' : '';   // if so, prepend with some ##'s
-                   return all + hhh + _t(subkey, replacements) + '\n\n';
-               }, '');
+           targets.enter().append('rect').attr('width', '20px').attr('height', '20px').attr('x', '-8px').attr('y', '-22px').merge(targets).sort(sortY).attr('class', function (d) {
+             var newClass = d.id < 0 ? 'new' : '';
+             return 'note target note-' + d.id + ' ' + fillClass + newClass;
+           }).attr('transform', getTransform);
 
-               return {
-                   key: helpkey,
-                   title: _t(helpkey + '.title'),
-                   html: marked_1(text.trim())
-               };
-           });
+           function sortY(a, b) {
+             return a.id === selectedID ? 1 : b.id === selectedID ? -1 : b.loc[1] - a.loc[1];
+           }
+         } // Draw the notes layer and schedule loading notes and updating markers.
 
 
-           function show() {
-               updatePosition();
+         function drawNotes(selection) {
+           var service = getService();
+           var surface = context.surface();
 
-               _body
-                   .classed('hide', false)
-                   .style('opacity', '0')
-                   .transition()
-                   .duration(200)
-                   .style('opacity', '1');
+           if (surface && !surface.empty()) {
+             touchLayer = surface.selectAll('.data-layer.touch .layer-touch.markers');
            }
 
+           drawLayer = selection.selectAll('.layer-notes').data(service ? [0] : []);
+           drawLayer.exit().remove();
+           drawLayer = drawLayer.enter().append('g').attr('class', 'layer-notes').style('display', _notesEnabled ? 'block' : 'none').merge(drawLayer);
 
-           function hide() {
-               _body
-                   .classed('hide', true)
-                   .transition()
-                   .duration(200)
-                   .style('opacity', '0')
-                   .on('end', function () {
-                       _body.classed('hide', true);
-                   });
+           if (_notesEnabled) {
+             if (service && ~~context.map().zoom() >= minZoom) {
+               editOn();
+               service.loadNotes(projection);
+               updateMarkers();
+             } else {
+               editOff();
+             }
            }
+         } // Toggles the layer on and off
 
 
-           function clickHelp(index) {
-               var d = docs[index];
-               var tkeys = fieldHelpKeys[fieldName][index][1];
+         drawNotes.enabled = function (val) {
+           if (!arguments.length) return _notesEnabled;
+           _notesEnabled = val;
 
-               _body.selectAll('.field-help-nav-item')
-                   .classed('active', function(d, i) { return i === index; });
-
-               var content = _body.selectAll('.field-help-content')
-                   .html(d.html);
+           if (_notesEnabled) {
+             layerOn();
+           } else {
+             layerOff();
 
-               // class the paragraphs so we can find and style them
-               content.selectAll('p')
-                   .attr('class', function(d, i) { return tkeys[i]; });
+             if (context.selectedNoteID()) {
+               context.enter(modeBrowse(context));
+             }
+           }
 
-               // insert special content for certain help sections
-               if (d.key === 'help.field.restrictions.inspecting') {
-                   content
-                       .insert('img', 'p.from_shadow')
-                       .attr('class', 'field-help-image cf')
-                       .attr('src', context.imagePath('tr_inspect.gif'));
+           dispatch$1.call('change');
+           return this;
+         };
 
-               } else if (d.key === 'help.field.restrictions.modifying') {
-                   content
-                       .insert('img', 'p.allow_turn')
-                       .attr('class', 'field-help-image cf')
-                       .attr('src', context.imagePath('tr_modify.gif'));
-               }
-           }
+         return drawNotes;
+       }
 
+       function svgTouch() {
+         function drawTouch(selection) {
+           selection.selectAll('.layer-touch').data(['areas', 'lines', 'points', 'turns', 'markers']).enter().append('g').attr('class', function (d) {
+             return 'layer-touch ' + d;
+           });
+         }
 
-           fieldHelp.button = function(selection) {
-               if (_body.empty()) return;
+         return drawTouch;
+       }
 
-               var button = selection.selectAll('.field-help-button')
-                   .data([0]);
+       function refresh(selection, node) {
+         var cr = node.getBoundingClientRect();
+         var prop = [cr.width, cr.height];
+         selection.property('__dimensions__', prop);
+         return prop;
+       }
 
-               // enter/update
-               button.enter()
-                   .append('button')
-                   .attr('class', 'field-help-button')
-                   .attr('tabindex', -1)
-                   .call(svgIcon('#iD-icon-help'))
-                   .merge(button)
-                   .on('click', function () {
-                       event.stopPropagation();
-                       event.preventDefault();
-                       if (_body.classed('hide')) {
-                           show();
-                       } else {
-                           hide();
-                       }
-                   });
-           };
+       function utilGetDimensions(selection, force) {
+         if (!selection || selection.empty()) {
+           return [0, 0];
+         }
 
+         var node = selection.node(),
+             cached = selection.property('__dimensions__');
+         return !cached || force ? refresh(selection, node) : cached;
+       }
+       function utilSetDimensions(selection, dimensions) {
+         if (!selection || selection.empty()) {
+           return selection;
+         }
 
-           function updatePosition() {
-               var wrap = _wrap.node();
-               var inspector = _inspector.node();
-               var wRect = wrap.getBoundingClientRect();
-               var iRect = inspector.getBoundingClientRect();
+         var node = selection.node();
 
-               _body
-                   .style('top', wRect.top + inspector.scrollTop - iRect.top + 'px');
-           }
+         if (dimensions === null) {
+           refresh(selection, node);
+           return selection;
+         }
 
+         return selection.property('__dimensions__', [dimensions[0], dimensions[1]]).attr('width', dimensions[0]).attr('height', dimensions[1]);
+       }
 
-           fieldHelp.body = function(selection) {
-               // This control expects the field to have a form-field-input-wrap div
-               _wrap = selection.selectAll('.form-field-input-wrap');
-               if (_wrap.empty()) return;
+       function svgLayers(projection, context) {
+         var dispatch$1 = dispatch('change');
+         var svg = select(null);
+         var _layers = [{
+           id: 'osm',
+           layer: svgOsm(projection, context, dispatch$1)
+         }, {
+           id: 'notes',
+           layer: svgNotes(projection, context, dispatch$1)
+         }, {
+           id: 'data',
+           layer: svgData(projection, context, dispatch$1)
+         }, {
+           id: 'keepRight',
+           layer: svgKeepRight(projection, context, dispatch$1)
+         }, {
+           id: 'improveOSM',
+           layer: svgImproveOSM(projection, context, dispatch$1)
+         }, {
+           id: 'osmose',
+           layer: svgOsmose(projection, context, dispatch$1)
+         }, {
+           id: 'streetside',
+           layer: svgStreetside(projection, context, dispatch$1)
+         }, {
+           id: 'mapillary',
+           layer: svgMapillaryImages(projection, context, dispatch$1)
+         }, {
+           id: 'mapillary-position',
+           layer: svgMapillaryPosition(projection, context)
+         }, {
+           id: 'mapillary-map-features',
+           layer: svgMapillaryMapFeatures(projection, context, dispatch$1)
+         }, {
+           id: 'mapillary-signs',
+           layer: svgMapillarySigns(projection, context, dispatch$1)
+         }, {
+           id: 'openstreetcam',
+           layer: svgOpenstreetcamImages(projection, context, dispatch$1)
+         }, {
+           id: 'debug',
+           layer: svgDebug(projection, context)
+         }, {
+           id: 'geolocate',
+           layer: svgGeolocate(projection)
+         }, {
+           id: 'touch',
+           layer: svgTouch()
+         }];
+
+         function drawLayers(selection) {
+           svg = selection.selectAll('.surface').data([0]);
+           svg = svg.enter().append('svg').attr('class', 'surface').merge(svg);
+           var defs = svg.selectAll('.surface-defs').data([0]);
+           defs.enter().append('defs').attr('class', 'surface-defs');
+           var groups = svg.selectAll('.data-layer').data(_layers);
+           groups.exit().remove();
+           groups.enter().append('g').attr('class', function (d) {
+             return 'data-layer ' + d.id;
+           }).merge(groups).each(function (d) {
+             select(this).call(d.layer);
+           });
+         }
 
-               // absolute position relative to the inspector, so it "floats" above the fields
-               _inspector = context.container().select('.sidebar .entity-editor-pane .inspector-body');
-               if (_inspector.empty()) return;
+         drawLayers.all = function () {
+           return _layers;
+         };
 
-               _body = _inspector.selectAll('.field-help-body')
-                   .data([0]);
+         drawLayers.layer = function (id) {
+           var obj = _layers.find(function (o) {
+             return o.id === id;
+           });
 
-               var enter = _body.enter()
-                   .append('div')
-                   .attr('class', 'field-help-body hide');   // initially hidden
+           return obj && obj.layer;
+         };
 
-               var titleEnter = enter
-                   .append('div')
-                   .attr('class', 'field-help-title cf');
-
-               titleEnter
-                   .append('h2')
-                   .attr('class', ((_mainLocalizer.textDirection() === 'rtl') ? 'fr' : 'fl'))
-                   .text(_t('help.field.' + fieldName + '.title'));
-
-               titleEnter
-                   .append('button')
-                   .attr('class', 'fr close')
-                   .on('click', function() {
-                       event.stopPropagation();
-                       event.preventDefault();
-                       hide();
-                   })
-                   .call(svgIcon('#iD-icon-close'));
-
-               var navEnter = enter
-                   .append('div')
-                   .attr('class', 'field-help-nav cf');
+         drawLayers.only = function (what) {
+           var arr = [].concat(what);
 
-               var titles = docs.map(function(d) { return d.title; });
-               navEnter.selectAll('.field-help-nav-item')
-                   .data(titles)
-                   .enter()
-                   .append('div')
-                   .attr('class', 'field-help-nav-item')
-                   .text(function(d) { return d; })
-                   .on('click', function(d, i) {
-                       event.stopPropagation();
-                       event.preventDefault();
-                       clickHelp(i);
-                   });
+           var all = _layers.map(function (layer) {
+             return layer.id;
+           });
 
-               enter
-                   .append('div')
-                   .attr('class', 'field-help-content');
+           return drawLayers.remove(utilArrayDifference(all, arr));
+         };
 
-               _body = _body
-                   .merge(enter);
+         drawLayers.remove = function (what) {
+           var arr = [].concat(what);
+           arr.forEach(function (id) {
+             _layers = _layers.filter(function (o) {
+               return o.id !== id;
+             });
+           });
+           dispatch$1.call('change');
+           return this;
+         };
 
-               clickHelp(0);
-           };
+         drawLayers.add = function (what) {
+           var arr = [].concat(what);
+           arr.forEach(function (obj) {
+             if ('id' in obj && 'layer' in obj) {
+               _layers.push(obj);
+             }
+           });
+           dispatch$1.call('change');
+           return this;
+         };
 
+         drawLayers.dimensions = function (val) {
+           if (!arguments.length) return utilGetDimensions(svg);
+           utilSetDimensions(svg, val);
+           return this;
+         };
 
-           return fieldHelp;
+         return utilRebind(drawLayers, dispatch$1, 'on');
        }
 
-       function uiFieldCheck(field, context) {
-           var dispatch$1 = dispatch('change');
-           var options = field.strings && field.strings.options;
-           var values = [];
-           var texts = [];
+       function svgLines(projection, context) {
+         var detected = utilDetect();
+         var highway_stack = {
+           motorway: 0,
+           motorway_link: 1,
+           trunk: 2,
+           trunk_link: 3,
+           primary: 4,
+           primary_link: 5,
+           secondary: 6,
+           tertiary: 7,
+           unclassified: 8,
+           residential: 9,
+           service: 10,
+           footway: 11
+         };
+
+         function drawTargets(selection, graph, entities, filter) {
+           var targetClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
+           var nopeClass = context.getDebug('target') ? 'red ' : 'nocolor ';
+           var getPath = svgPath(projection).geojson;
+           var activeID = context.activeID();
+           var base = context.history().base(); // The targets and nopes will be MultiLineString sub-segments of the ways
+
+           var data = {
+             targets: [],
+             nopes: []
+           };
+           entities.forEach(function (way) {
+             var features = svgSegmentWay(way, graph, activeID);
+             data.targets.push.apply(data.targets, features.passive);
+             data.nopes.push.apply(data.nopes, features.active);
+           }); // Targets allow hover and vertex snapping
+
+           var targetData = data.targets.filter(getPath);
+           var targets = selection.selectAll('.line.target-allowed').filter(function (d) {
+             return filter(d.properties.entity);
+           }).data(targetData, function key(d) {
+             return d.id;
+           }); // exit
+
+           targets.exit().remove();
+
+           var segmentWasEdited = function segmentWasEdited(d) {
+             var wayID = d.properties.entity.id; // if the whole line was edited, don't draw segment changes
+
+             if (!base.entities[wayID] || !fastDeepEqual(graph.entities[wayID].nodes, base.entities[wayID].nodes)) {
+               return false;
+             }
 
-           var _tags;
+             return d.properties.nodes.some(function (n) {
+               return !base.entities[n.id] || !fastDeepEqual(graph.entities[n.id].loc, base.entities[n.id].loc);
+             });
+           }; // enter/update
 
-           var input = select(null);
-           var text = select(null);
-           var label = select(null);
-           var reverser = select(null);
 
-           var _impliedYes;
-           var _entityIDs = [];
-           var _value;
+           targets.enter().append('path').merge(targets).attr('d', getPath).attr('class', function (d) {
+             return 'way line target target-allowed ' + targetClass + d.id;
+           }).classed('segment-edited', segmentWasEdited); // NOPE
 
+           var nopeData = data.nopes.filter(getPath);
+           var nopes = selection.selectAll('.line.target-nope').filter(function (d) {
+             return filter(d.properties.entity);
+           }).data(nopeData, function key(d) {
+             return d.id;
+           }); // exit
 
-           if (options) {
-               for (var k in options) {
-                   values.push(k === 'undefined' ? undefined : k);
-                   texts.push(field.t('options.' + k, { 'default': options[k] }));
-               }
-           } else {
-               values = [undefined, 'yes'];
-               texts = [_t('inspector.unknown'), _t('inspector.check.yes')];
-               if (field.type !== 'defaultCheck') {
-                   values.push('no');
-                   texts.push(_t('inspector.check.no'));
-               }
-           }
+           nopes.exit().remove(); // enter/update
 
+           nopes.enter().append('path').merge(nopes).attr('d', getPath).attr('class', function (d) {
+             return 'way line target target-nope ' + nopeClass + d.id;
+           }).classed('segment-edited', segmentWasEdited);
+         }
 
-           // Checks tags to see whether an undefined value is "Assumed to be Yes"
-           function checkImpliedYes() {
-               _impliedYes = (field.id === 'oneway_yes');
+         function drawLines(selection, graph, entities, filter) {
+           var base = context.history().base();
 
-               // hack: pretend `oneway` field is a `oneway_yes` field
-               // where implied oneway tag exists (e.g. `junction=roundabout`) #2220, #1841
-               if (field.id === 'oneway') {
-                   var entity = context.entity(_entityIDs[0]);
-                   for (var key in entity.tags) {
-                       if (key in osmOneWayTags && (entity.tags[key] in osmOneWayTags[key])) {
-                           _impliedYes = true;
-                           texts[0] = _t('presets.fields.oneway_yes.options.undefined');
-                           break;
-                       }
-                   }
-               }
-           }
+           function waystack(a, b) {
+             var selected = context.selectedIDs();
+             var scoreA = selected.indexOf(a.id) !== -1 ? 20 : 0;
+             var scoreB = selected.indexOf(b.id) !== -1 ? 20 : 0;
+
+             if (a.tags.highway) {
+               scoreA -= highway_stack[a.tags.highway];
+             }
 
+             if (b.tags.highway) {
+               scoreB -= highway_stack[b.tags.highway];
+             }
 
-           function reverserHidden() {
-               if (!context.container().select('div.inspector-hover').empty()) return true;
-               return !(_value === 'yes' || (_impliedYes && !_value));
+             return scoreA - scoreB;
            }
 
+           function drawLineGroup(selection, klass, isSelected) {
+             // Note: Don't add `.selected` class in draw modes
+             var mode = context.mode();
+             var isDrawing = mode && /^draw/.test(mode.id);
+             var selectedClass = !isDrawing && isSelected ? 'selected ' : '';
+             var lines = selection.selectAll('path').filter(filter).data(getPathData(isSelected), osmEntity.key);
+             lines.exit().remove(); // Optimization: Call expensive TagClasses only on enter selection. This
+             // works because osmEntity.key is defined to include the entity v attribute.
 
-           function reverserSetText(selection) {
-               var entity = _entityIDs.length && context.hasEntity(_entityIDs[0]);
-               if (reverserHidden() || !entity) return selection;
+             lines.enter().append('path').attr('class', function (d) {
+               var prefix = 'way line'; // if this line isn't styled by its own tags
 
-               var first = entity.first();
-               var last = entity.isClosed() ? entity.nodes[entity.nodes.length - 2] : entity.last();
-               var pseudoDirection = first < last;
-               var icon = pseudoDirection ? '#iD-icon-forward' : '#iD-icon-backward';
+               if (!d.hasInterestingTags()) {
+                 var parentRelations = graph.parentRelations(d);
+                 var parentMultipolygons = parentRelations.filter(function (relation) {
+                   return relation.isMultipolygon();
+                 }); // and if it's a member of at least one multipolygon relation
 
-               selection.selectAll('.reverser-span')
-                   .text(_t('inspector.check.reverser'))
-                   .call(svgIcon(icon, 'inline'));
+                 if (parentMultipolygons.length > 0 && // and only multipolygon relations
+                 parentRelations.length === parentMultipolygons.length) {
+                   // then fudge the classes to style this as an area edge
+                   prefix = 'relation area';
+                 }
+               }
 
-               return selection;
+               var oldMPClass = oldMultiPolygonOuters[d.id] ? 'old-multipolygon ' : '';
+               return prefix + ' ' + klass + ' ' + selectedClass + oldMPClass + d.id;
+             }).classed('added', function (d) {
+               return !base.entities[d.id];
+             }).classed('geometry-edited', function (d) {
+               return graph.entities[d.id] && base.entities[d.id] && !fastDeepEqual(graph.entities[d.id].nodes, base.entities[d.id].nodes);
+             }).classed('retagged', function (d) {
+               return graph.entities[d.id] && base.entities[d.id] && !fastDeepEqual(graph.entities[d.id].tags, base.entities[d.id].tags);
+             }).call(svgTagClasses()).merge(lines).sort(waystack).attr('d', getPath).call(svgTagClasses().tags(svgRelationMemberTags(graph)));
+             return selection;
+           }
+
+           function getPathData(isSelected) {
+             return function () {
+               var layer = this.parentNode.__data__;
+               var data = pathdata[layer] || [];
+               return data.filter(function (d) {
+                 if (isSelected) return context.selectedIDs().indexOf(d.id) !== -1;else return context.selectedIDs().indexOf(d.id) === -1;
+               });
+             };
            }
 
+           function addMarkers(layergroup, pathclass, groupclass, groupdata, marker) {
+             var markergroup = layergroup.selectAll('g.' + groupclass).data([pathclass]);
+             markergroup = markergroup.enter().append('g').attr('class', groupclass).merge(markergroup);
+             var markers = markergroup.selectAll('path').filter(filter).data(function data() {
+               return groupdata[this.parentNode.__data__] || [];
+             }, function key(d) {
+               return [d.id, d.index];
+             });
+             markers.exit().remove();
+             markers = markers.enter().append('path').attr('class', pathclass).merge(markers).attr('marker-mid', marker).attr('d', function (d) {
+               return d.d;
+             });
 
-           var check = function(selection) {
-               checkImpliedYes();
-
-               label = selection.selectAll('.form-field-input-wrap')
-                   .data([0]);
+             if (detected.ie) {
+               markers.each(function () {
+                 this.parentNode.insertBefore(this, this);
+               });
+             }
+           }
 
-               var enter = label.enter()
-                   .append('label')
-                   .attr('class', 'form-field-input-wrap form-field-input-check');
+           var getPath = svgPath(projection, graph);
+           var ways = [];
+           var onewaydata = {};
+           var sideddata = {};
+           var oldMultiPolygonOuters = {};
 
-               enter
-                   .append('input')
-                   .property('indeterminate', field.type !== 'defaultCheck')
-                   .attr('type', 'checkbox')
-                   .attr('id', field.domId);
+           for (var i = 0; i < entities.length; i++) {
+             var entity = entities[i];
+             var outer = osmOldMultipolygonOuterMember(entity, graph);
 
-               enter
-                   .append('span')
-                   .text(texts[0])
-                   .attr('class', 'value');
+             if (outer) {
+               ways.push(entity.mergeTags(outer.tags));
+               oldMultiPolygonOuters[outer.id] = true;
+             } else if (entity.geometry(graph) === 'line') {
+               ways.push(entity);
+             }
+           }
 
-               if (field.type === 'onewayCheck') {
-                   enter
-                       .append('a')
-                       .attr('class', 'reverser button' + (reverserHidden() ? ' hide' : ''))
-                       .attr('href', '#')
-                       .append('span')
-                       .attr('class', 'reverser-span');
-               }
+           ways = ways.filter(getPath);
+           var pathdata = utilArrayGroupBy(ways, function (way) {
+             return way.layer();
+           });
+           Object.keys(pathdata).forEach(function (k) {
+             var v = pathdata[k];
+             var onewayArr = v.filter(function (d) {
+               return d.isOneWay();
+             });
+             var onewaySegments = svgMarkerSegments(projection, graph, 35, function shouldReverse(entity) {
+               return entity.tags.oneway === '-1';
+             }, function bothDirections(entity) {
+               return entity.tags.oneway === 'reversible' || entity.tags.oneway === 'alternating';
+             });
+             onewaydata[k] = utilArrayFlatten(onewayArr.map(onewaySegments));
+             var sidedArr = v.filter(function (d) {
+               return d.isSided();
+             });
+             var sidedSegments = svgMarkerSegments(projection, graph, 30, function shouldReverse() {
+               return false;
+             }, function bothDirections() {
+               return false;
+             });
+             sideddata[k] = utilArrayFlatten(sidedArr.map(sidedSegments));
+           });
+           var covered = selection.selectAll('.layer-osm.covered'); // under areas
 
-               label = label.merge(enter);
-               input = label.selectAll('input');
-               text = label.selectAll('span.value');
+           var uncovered = selection.selectAll('.layer-osm.lines'); // over areas
 
-               input
-                   .on('click', function() {
-                       event.stopPropagation();
-                       var t = {};
+           var touchLayer = selection.selectAll('.layer-touch.lines'); // Draw lines..
 
-                       if (Array.isArray(_tags[field.key])) {
-                           if (values.indexOf('yes') !== -1) {
-                               t[field.key] = 'yes';
-                           } else {
-                               t[field.key] = values[0];
-                           }
-                       } else {
-                           t[field.key] = values[(values.indexOf(_value) + 1) % values.length];
-                       }
+           [covered, uncovered].forEach(function (selection) {
+             var range$1 = selection === covered ? range(-10, 0) : range(0, 11);
+             var layergroup = selection.selectAll('g.layergroup').data(range$1);
+             layergroup = layergroup.enter().append('g').attr('class', function (d) {
+               return 'layergroup layer' + String(d);
+             }).merge(layergroup);
+             layergroup.selectAll('g.linegroup').data(['shadow', 'casing', 'stroke', 'shadow-highlighted', 'casing-highlighted', 'stroke-highlighted']).enter().append('g').attr('class', function (d) {
+               return 'linegroup line-' + d;
+             });
+             layergroup.selectAll('g.line-shadow').call(drawLineGroup, 'shadow', false);
+             layergroup.selectAll('g.line-casing').call(drawLineGroup, 'casing', false);
+             layergroup.selectAll('g.line-stroke').call(drawLineGroup, 'stroke', false);
+             layergroup.selectAll('g.line-shadow-highlighted').call(drawLineGroup, 'shadow', true);
+             layergroup.selectAll('g.line-casing-highlighted').call(drawLineGroup, 'casing', true);
+             layergroup.selectAll('g.line-stroke-highlighted').call(drawLineGroup, 'stroke', true);
+             addMarkers(layergroup, 'oneway', 'onewaygroup', onewaydata, 'url(#ideditor-oneway-marker)');
+             addMarkers(layergroup, 'sided', 'sidedgroup', sideddata, function marker(d) {
+               var category = graph.entity(d.id).sidednessIdentifier();
+               return 'url(#ideditor-sided-marker-' + category + ')';
+             });
+           }); // Draw touch targets..
 
-                       // Don't cycle through `alternating` or `reversible` states - #4970
-                       // (They are supported as translated strings, but should not toggle with clicks)
-                       if (t[field.key] === 'reversible' || t[field.key] === 'alternating') {
-                           t[field.key] = values[0];
-                       }
+           touchLayer.call(drawTargets, graph, ways, filter);
+         }
 
-                       dispatch$1.call('change', this, t);
-                   });
+         return drawLines;
+       }
 
-               if (field.type === 'onewayCheck') {
-                   reverser = label.selectAll('.reverser');
-
-                   reverser
-                       .call(reverserSetText)
-                       .on('click', function() {
-                           event.preventDefault();
-                           event.stopPropagation();
-                           context.perform(
-                               function(graph) {
-                                   for (var i in _entityIDs) {
-                                       graph = actionReverse(_entityIDs[i])(graph);
-                                   }
-                                   return graph;
-                               },
-                               _t('operations.reverse.annotation')
-                           );
-
-                           // must manually revalidate since no 'change' event was called
-                           context.validator().validate();
+       function svgMidpoints(projection, context) {
+         var targetRadius = 8;
 
-                           select(this)
-                               .call(reverserSetText);
-                       });
+         function drawTargets(selection, graph, entities, filter) {
+           var fillClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
+           var getTransform = svgPointTransform(projection).geojson;
+           var data = entities.map(function (midpoint) {
+             return {
+               type: 'Feature',
+               id: midpoint.id,
+               properties: {
+                 target: true,
+                 entity: midpoint
+               },
+               geometry: {
+                 type: 'Point',
+                 coordinates: midpoint.loc
                }
-           };
+             };
+           });
+           var targets = selection.selectAll('.midpoint.target').filter(function (d) {
+             return filter(d.properties.entity);
+           }).data(data, function key(d) {
+             return d.id;
+           }); // exit
 
+           targets.exit().remove(); // enter/update
 
-           check.entityIDs = function(val) {
-               if (!arguments.length) return _entityIDs;
-               _entityIDs = val;
-               return check;
-           };
+           targets.enter().append('circle').attr('r', targetRadius).merge(targets).attr('class', function (d) {
+             return 'node midpoint target ' + fillClass + d.id;
+           }).attr('transform', getTransform);
+         }
 
+         function drawMidpoints(selection, graph, entities, filter, extent) {
+           var drawLayer = selection.selectAll('.layer-osm.points .points-group.midpoints');
+           var touchLayer = selection.selectAll('.layer-touch.points');
+           var mode = context.mode();
 
-           check.tags = function(tags) {
+           if (mode && mode.id !== 'select' || !context.map().withinEditableZoom()) {
+             drawLayer.selectAll('.midpoint').remove();
+             touchLayer.selectAll('.midpoint.target').remove();
+             return;
+           }
 
-               _tags = tags;
+           var poly = extent.polygon();
+           var midpoints = {};
 
-               function isChecked(val) {
-                   return val !== 'no' && val !== '' && val !== undefined && val !== null;
-               }
+           for (var i = 0; i < entities.length; i++) {
+             var entity = entities[i];
+             if (entity.type !== 'way') continue;
+             if (!filter(entity)) continue;
+             if (context.selectedIDs().indexOf(entity.id) < 0) continue;
+             var nodes = graph.childNodes(entity);
 
-               function textFor(val) {
-                   if (val === '') val = undefined;
-                   var index = values.indexOf(val);
-                   return (index !== -1 ? texts[index] : ('"' + val + '"'));
-               }
+             for (var j = 0; j < nodes.length - 1; j++) {
+               var a = nodes[j];
+               var b = nodes[j + 1];
+               var id = [a.id, b.id].sort().join('-');
 
-               checkImpliedYes();
+               if (midpoints[id]) {
+                 midpoints[id].parents.push(entity);
+               } else if (geoVecLength(projection(a.loc), projection(b.loc)) > 40) {
+                 var point = geoVecInterp(a.loc, b.loc, 0.5);
+                 var loc = null;
 
-               var isMixed = Array.isArray(tags[field.key]);
+                 if (extent.intersects(point)) {
+                   loc = point;
+                 } else {
+                   for (var k = 0; k < 4; k++) {
+                     point = geoLineIntersection([a.loc, b.loc], [poly[k], poly[k + 1]]);
 
-               _value = !isMixed && tags[field.key] && tags[field.key].toLowerCase();
+                     if (point && geoVecLength(projection(a.loc), projection(point)) > 20 && geoVecLength(projection(b.loc), projection(point)) > 20) {
+                       loc = point;
+                       break;
+                     }
+                   }
+                 }
 
-               if (field.type === 'onewayCheck' && (_value === '1' || _value === '-1')) {
-                   _value = 'yes';
+                 if (loc) {
+                   midpoints[id] = {
+                     type: 'midpoint',
+                     id: id,
+                     loc: loc,
+                     edge: [a.id, b.id],
+                     parents: [entity]
+                   };
+                 }
                }
+             }
+           }
 
-               input
-                   .property('indeterminate', isMixed || (field.type !== 'defaultCheck' && !_value))
-                   .property('checked', isChecked(_value));
-
-               text
-                   .text(isMixed ? _t('inspector.multiple_values') : textFor(_value))
-                   .classed('mixed', isMixed);
-
-               label
-                   .classed('set', !!_value);
+           function midpointFilter(d) {
+             if (midpoints[d.id]) return true;
 
-               if (field.type === 'onewayCheck') {
-                   reverser
-                       .classed('hide', reverserHidden())
-                       .call(reverserSetText);
+             for (var i = 0; i < d.parents.length; i++) {
+               if (filter(d.parents[i])) {
+                 return true;
                }
-           };
-
-
-           check.focus = function() {
-               input.node().focus();
-           };
-
-           return utilRebind(check, dispatch$1, 'on');
-       }
+             }
 
-       function uiFieldCombo(field, context) {
-           var dispatch$1 = dispatch('change');
-           var taginfo = services.taginfo;
-           var isMulti = (field.type === 'multiCombo');
-           var isNetwork = (field.type === 'networkCombo');
-           var isSemi = (field.type === 'semiCombo');
-           var optstrings = field.strings && field.strings.options;
-           var optarray = field.options;
-           var snake_case = (field.snake_case || (field.snake_case === undefined));
-           var caseSensitive = field.caseSensitive;
-           var combobox = uiCombobox(context, 'combo-' + field.safeid)
-               .caseSensitive(caseSensitive)
-               .minItems(isMulti || isSemi ? 1 : 2);
-           var container = select(null);
-           var inputWrap = select(null);
-           var input = select(null);
-           var _comboData = [];
-           var _multiData = [];
-           var _entityIDs = [];
-           var _tags;
-           var _countryCode;
-           var _staticPlaceholder;
-
-           // initialize deprecated tags array
-           var _dataDeprecated = [];
-           _mainFileFetcher.get('deprecated')
-               .then(function(d) { _dataDeprecated = d; })
-               .catch(function() { /* ignore */ });
-
-
-           // ensure multiCombo field.key ends with a ':'
-           if (isMulti && /[^:]$/.test(field.key)) {
-               field.key += ':';
-           }
-
-
-           function snake(s) {
-               return s.replace(/\s+/g, '_');
-           }
-
-           function unsnake(s) {
-               return s.replace(/_+/g, ' ');
-           }
-
-           function clean(s) {
-               return s.split(';')
-                   .map(function(s) { return s.trim(); })
-                   .join(';');
+             return false;
            }
 
+           var groups = drawLayer.selectAll('.midpoint').filter(midpointFilter).data(Object.values(midpoints), function (d) {
+             return d.id;
+           });
+           groups.exit().remove();
+           var enter = groups.enter().insert('g', ':first-child').attr('class', 'midpoint');
+           enter.append('polygon').attr('points', '-6,8 10,0 -6,-8').attr('class', 'shadow');
+           enter.append('polygon').attr('points', '-3,4 5,0 -3,-4').attr('class', 'fill');
+           groups = groups.merge(enter).attr('transform', function (d) {
+             var translate = svgPointTransform(projection);
+             var a = graph.entity(d.edge[0]);
+             var b = graph.entity(d.edge[1]);
+             var angle = geoAngle(a, b, projection) * (180 / Math.PI);
+             return translate(d) + ' rotate(' + angle + ')';
+           }).call(svgTagClasses().tags(function (d) {
+             return d.parents[0].tags;
+           })); // Propagate data bindings.
 
-           // returns the tag value for a display value
-           // (for multiCombo, dval should be the key suffix, not the entire key)
-           function tagValue(dval) {
-               dval = clean(dval || '');
+           groups.select('polygon.shadow');
+           groups.select('polygon.fill'); // Draw touch targets..
 
-               if (optstrings) {
-                   var found = _comboData.find(function(o) {
-                       return o.key && clean(o.value) === dval;
-                   });
-                   if (found) {
-                       return found.key;
-                   }
-               }
+           touchLayer.call(drawTargets, graph, Object.values(midpoints), midpointFilter);
+         }
 
-               if (field.type === 'typeCombo' && !dval) {
-                   return 'yes';
-               }
+         return drawMidpoints;
+       }
 
-               return (snake_case ? snake(dval) : dval) || undefined;
-           }
+       function svgPoints(projection, context) {
+         function markerPath(selection, klass) {
+           selection.attr('class', klass).attr('transform', 'translate(-8, -23)').attr('d', 'M 17,8 C 17,13 11,21 8.5,23.5 C 6,21 0,13 0,8 C 0,4 4,-0.5 8.5,-0.5 C 13,-0.5 17,4 17,8 z');
+         }
 
+         function sortY(a, b) {
+           return b.loc[1] - a.loc[1];
+         } // Avoid exit/enter if we're just moving stuff around.
+         // The node will get a new version but we only need to run the update selection.
 
-           // returns the display value for a tag value
-           // (for multiCombo, tval should be the key suffix, not the entire key)
-           function displayValue(tval) {
-               tval = tval || '';
 
-               if (optstrings) {
-                   var found = _comboData.find(function(o) {
-                       return o.key === tval && o.value;
-                   });
-                   if (found) {
-                       return found.value;
-                   }
-               }
+         function fastEntityKey(d) {
+           var mode = context.mode();
+           var isMoving = mode && /^(add|draw|drag|move|rotate)/.test(mode.id);
+           return isMoving ? d.id : osmEntity.key(d);
+         }
 
-               if (field.type === 'typeCombo' && tval.toLowerCase() === 'yes') {
-                   return '';
-               }
+         function drawTargets(selection, graph, entities, filter) {
+           var fillClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
+           var getTransform = svgPointTransform(projection).geojson;
+           var activeID = context.activeID();
+           var data = [];
+           entities.forEach(function (node) {
+             if (activeID === node.id) return; // draw no target on the activeID
 
-               return snake_case ? unsnake(tval) : tval;
-           }
+             data.push({
+               type: 'Feature',
+               id: node.id,
+               properties: {
+                 target: true,
+                 entity: node
+               },
+               geometry: node.asGeoJSON()
+             });
+           });
+           var targets = selection.selectAll('.point.target').filter(function (d) {
+             return filter(d.properties.entity);
+           }).data(data, function key(d) {
+             return d.id;
+           }); // exit
+
+           targets.exit().remove(); // enter/update
+
+           targets.enter().append('rect').attr('x', -10).attr('y', -26).attr('width', 20).attr('height', 30).merge(targets).attr('class', function (d) {
+             return 'node point target ' + fillClass + d.id;
+           }).attr('transform', getTransform);
+         }
+
+         function drawPoints(selection, graph, entities, filter) {
+           var wireframe = context.surface().classed('fill-wireframe');
+           var zoom = geoScaleToZoom(projection.scale());
+           var base = context.history().base(); // Points with a direction will render as vertices at higher zooms..
+
+           function renderAsPoint(entity) {
+             return entity.geometry(graph) === 'point' && !(zoom >= 18 && entity.directions(graph, projection).length);
+           } // All points will render as vertices in wireframe mode too..
+
+
+           var points = wireframe ? [] : entities.filter(renderAsPoint);
+           points.sort(sortY);
+           var drawLayer = selection.selectAll('.layer-osm.points .points-group.points');
+           var touchLayer = selection.selectAll('.layer-touch.points'); // Draw points..
+
+           var groups = drawLayer.selectAll('g.point').filter(filter).data(points, fastEntityKey);
+           groups.exit().remove();
+           var enter = groups.enter().append('g').attr('class', function (d) {
+             return 'node point ' + d.id;
+           }).order();
+           enter.append('path').call(markerPath, 'shadow');
+           enter.append('ellipse').attr('cx', 0.5).attr('cy', 1).attr('rx', 6.5).attr('ry', 3).attr('class', 'stroke');
+           enter.append('path').call(markerPath, 'stroke');
+           enter.append('use').attr('transform', 'translate(-5, -19)').attr('class', 'icon').attr('width', '11px').attr('height', '11px');
+           groups = groups.merge(enter).attr('transform', svgPointTransform(projection)).classed('added', function (d) {
+             return !base.entities[d.id]; // if it doesn't exist in the base graph, it's new
+           }).classed('moved', function (d) {
+             return base.entities[d.id] && !fastDeepEqual(graph.entities[d.id].loc, base.entities[d.id].loc);
+           }).classed('retagged', function (d) {
+             return base.entities[d.id] && !fastDeepEqual(graph.entities[d.id].tags, base.entities[d.id].tags);
+           }).call(svgTagClasses());
+           groups.select('.shadow'); // propagate bound data
+
+           groups.select('.stroke'); // propagate bound data
+
+           groups.select('.icon') // propagate bound data
+           .attr('xlink:href', function (entity) {
+             var preset = _mainPresetIndex.match(entity, graph);
+             var picon = preset && preset.icon;
+
+             if (!picon) {
+               return '';
+             } else {
+               var isMaki = /^maki-/.test(picon);
+               return '#' + picon + (isMaki ? '-11' : '');
+             }
+           }); // Draw touch targets..
 
+           touchLayer.call(drawTargets, graph, points, filter);
+         }
 
-           // Compute the difference between arrays of objects by `value` property
-           //
-           // objectDifference([{value:1}, {value:2}, {value:3}], [{value:2}])
-           // > [{value:1}, {value:3}]
-           //
-           function objectDifference(a, b) {
-               return a.filter(function(d1) {
-                   return !b.some(function(d2) {
-                       return !d2.isMixed && d1.value === d2.value;
-                   });
-               });
-           }
+         return drawPoints;
+       }
 
+       function svgTurns(projection, context) {
+         function icon(turn) {
+           var u = turn.u ? '-u' : '';
+           if (turn.no) return '#iD-turn-no' + u;
+           if (turn.only) return '#iD-turn-only' + u;
+           return '#iD-turn-yes' + u;
+         }
 
-           function initCombo(selection, attachTo) {
-               if (optstrings) {
-                   selection.attr('readonly', 'readonly');
-                   selection.call(combobox, attachTo);
-                   setStaticValues(setPlaceholder);
+         function drawTurns(selection, graph, turns) {
+           function turnTransform(d) {
+             var pxRadius = 50;
+             var toWay = graph.entity(d.to.way);
+             var toPoints = graph.childNodes(toWay).map(function (n) {
+               return n.loc;
+             }).map(projection);
+             var toLength = geoPathLength(toPoints);
+             var mid = toLength / 2; // midpoint of destination way
 
-               } else if (optarray) {
-                   selection.call(combobox, attachTo);
-                   setStaticValues(setPlaceholder);
+             var toNode = graph.entity(d.to.node);
+             var toVertex = graph.entity(d.to.vertex);
+             var a = geoAngle(toVertex, toNode, projection);
+             var o = projection(toVertex.loc);
+             var r = d.u ? 0 // u-turn: no radius
+             : !toWay.__via ? pxRadius // leaf way: put marker at pxRadius
+             : Math.min(mid, pxRadius); // via way: prefer pxRadius, fallback to mid for very short ways
 
-               } else if (taginfo) {
-                   selection.call(combobox.fetcher(setTaginfoValues), attachTo);
-                   setTaginfoValues('', setPlaceholder);
-               }
+             return 'translate(' + (r * Math.cos(a) + o[0]) + ',' + (r * Math.sin(a) + o[1]) + ') ' + 'rotate(' + a * 180 / Math.PI + ')';
            }
 
+           var drawLayer = selection.selectAll('.layer-osm.points .points-group.turns');
+           var touchLayer = selection.selectAll('.layer-touch.turns'); // Draw turns..
 
-           function setStaticValues(callback) {
-               if (!(optstrings || optarray)) return;
-
-               if (optstrings) {
-                   _comboData = Object.keys(optstrings).map(function(k) {
-                       var v = field.t('options.' + k, { 'default': optstrings[k] });
-                       return {
-                           key: k,
-                           value: v,
-                           title: v
-                       };
-                   });
+           var groups = drawLayer.selectAll('g.turn').data(turns, function (d) {
+             return d.key;
+           }); // exit
 
-               } else if (optarray) {
-                   _comboData = optarray.map(function(k) {
-                       var v = snake_case ? unsnake(k) : k;
-                       return {
-                           key: k,
-                           value: v,
-                           title: v
-                       };
-                   });
-               }
+           groups.exit().remove(); // enter
 
-               combobox.data(objectDifference(_comboData, _multiData));
-               if (callback) callback(_comboData);
-           }
+           var groupsEnter = groups.enter().append('g').attr('class', function (d) {
+             return 'turn ' + d.key;
+           });
+           var turnsEnter = groupsEnter.filter(function (d) {
+             return !d.u;
+           });
+           turnsEnter.append('rect').attr('transform', 'translate(-22, -12)').attr('width', '44').attr('height', '24');
+           turnsEnter.append('use').attr('transform', 'translate(-22, -12)').attr('width', '44').attr('height', '24');
+           var uEnter = groupsEnter.filter(function (d) {
+             return d.u;
+           });
+           uEnter.append('circle').attr('r', '16');
+           uEnter.append('use').attr('transform', 'translate(-16, -16)').attr('width', '32').attr('height', '32'); // update
 
+           groups = groups.merge(groupsEnter).attr('opacity', function (d) {
+             return d.direct === false ? '0.7' : null;
+           }).attr('transform', turnTransform);
+           groups.select('use').attr('xlink:href', icon);
+           groups.select('rect'); // propagate bound data
 
-           function setTaginfoValues(q, callback) {
-               var fn = isMulti ? 'multikeys' : 'values';
-               var query = (isMulti ? field.key : '') + q;
-               var hasCountryPrefix = isNetwork && _countryCode && _countryCode.indexOf(q.toLowerCase()) === 0;
-               if (hasCountryPrefix) {
-                   query = _countryCode + ':';
-               }
+           groups.select('circle'); // propagate bound data
+           // Draw touch targets..
 
-               var params = {
-                   debounce: (q !== ''),
-                   key: field.key,
-                   query: query
-               };
+           var fillClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
+           groups = touchLayer.selectAll('g.turn').data(turns, function (d) {
+             return d.key;
+           }); // exit
 
-               if (_entityIDs.length) {
-                   params.geometry = context.graph().geometry(_entityIDs[0]);
-               }
+           groups.exit().remove(); // enter
 
-               taginfo[fn](params, function(err, data) {
-                   if (err) return;
+           groupsEnter = groups.enter().append('g').attr('class', function (d) {
+             return 'turn ' + d.key;
+           });
+           turnsEnter = groupsEnter.filter(function (d) {
+             return !d.u;
+           });
+           turnsEnter.append('rect').attr('class', 'target ' + fillClass).attr('transform', 'translate(-22, -12)').attr('width', '44').attr('height', '24');
+           uEnter = groupsEnter.filter(function (d) {
+             return d.u;
+           });
+           uEnter.append('circle').attr('class', 'target ' + fillClass).attr('r', '16'); // update
 
-                   data = data.filter(function(d) {
+           groups = groups.merge(groupsEnter).attr('transform', turnTransform);
+           groups.select('rect'); // propagate bound data
 
-                       if (field.type === 'typeCombo' && d.value === 'yes') {
-                           // don't show the fallback value
-                           return false;
-                       }
+           groups.select('circle'); // propagate bound data
 
-                       // don't show values with very low usage
-                       return !d.count || d.count > 10;
-                   });
+           return this;
+         }
 
-                   var deprecatedValues = osmEntity.deprecatedTagValuesByKey(_dataDeprecated)[field.key];
-                   if (deprecatedValues) {
-                       // don't suggest deprecated tag values
-                       data = data.filter(function(d) {
-                           return deprecatedValues.indexOf(d.value) === -1;
-                       });
-                   }
+         return drawTurns;
+       }
 
-                   if (hasCountryPrefix) {
-                       data = data.filter(function(d) {
-                           return d.value.toLowerCase().indexOf(_countryCode + ':') === 0;
-                       });
-                   }
+       function svgVertices(projection, context) {
+         var radiuses = {
+           //       z16-, z17,   z18+,  w/icon
+           shadow: [6, 7.5, 7.5, 12],
+           stroke: [2.5, 3.5, 3.5, 8],
+           fill: [1, 1.5, 1.5, 1.5]
+         };
+
+         var _currHoverTarget;
+
+         var _currPersistent = {};
+         var _currHover = {};
+         var _prevHover = {};
+         var _currSelected = {};
+         var _prevSelected = {};
+         var _radii = {};
+
+         function sortY(a, b) {
+           return b.loc[1] - a.loc[1];
+         } // Avoid exit/enter if we're just moving stuff around.
+         // The node will get a new version but we only need to run the update selection.
+
+
+         function fastEntityKey(d) {
+           var mode = context.mode();
+           var isMoving = mode && /^(add|draw|drag|move|rotate)/.test(mode.id);
+           return isMoving ? d.id : osmEntity.key(d);
+         }
+
+         function draw(selection, graph, vertices, sets, filter) {
+           sets = sets || {
+             selected: {},
+             important: {},
+             hovered: {}
+           };
+           var icons = {};
+           var directions = {};
+           var wireframe = context.surface().classed('fill-wireframe');
+           var zoom = geoScaleToZoom(projection.scale());
+           var z = zoom < 17 ? 0 : zoom < 18 ? 1 : 2;
+           var activeID = context.activeID();
+           var base = context.history().base();
+
+           function getIcon(d) {
+             // always check latest entity, as fastEntityKey avoids enter/exit now
+             var entity = graph.entity(d.id);
+             if (entity.id in icons) return icons[entity.id];
+             icons[entity.id] = entity.hasInterestingTags() && _mainPresetIndex.match(entity, graph).icon;
+             return icons[entity.id];
+           } // memoize directions results, return false for empty arrays (for use in filter)
+
+
+           function getDirections(entity) {
+             if (entity.id in directions) return directions[entity.id];
+             var angles = entity.directions(graph, projection);
+             directions[entity.id] = angles.length ? angles : false;
+             return angles;
+           }
+
+           function updateAttributes(selection) {
+             ['shadow', 'stroke', 'fill'].forEach(function (klass) {
+               var rads = radiuses[klass];
+               selection.selectAll('.' + klass).each(function (entity) {
+                 var i = z && getIcon(entity);
+                 var r = rads[i ? 3 : z]; // slightly increase the size of unconnected endpoints #3775
+
+                 if (entity.id !== activeID && entity.isEndpoint(graph) && !entity.isConnected(graph)) {
+                   r += 1.5;
+                 }
 
-                   // hide the caret if there are no suggestions
-                   container.classed('empty-combobox', data.length === 0);
-
-                   _comboData = data.map(function(d) {
-                       var k = d.value;
-                       if (isMulti) k = k.replace(field.key, '');
-                       var v = snake_case ? unsnake(k) : k;
-                       return {
-                           key: k,
-                           value: v,
-                           title: isMulti ? v : d.title
-                       };
-                   });
+                 if (klass === 'shadow') {
+                   // remember this value, so we don't need to
+                   _radii[entity.id] = r; // recompute it when we draw the touch targets
+                 }
 
-                   _comboData = objectDifference(_comboData, _multiData);
-                   if (callback) callback(_comboData);
+                 select(this).attr('r', r).attr('visibility', i && klass === 'fill' ? 'hidden' : null);
                });
+             });
            }
 
+           vertices.sort(sortY);
+           var groups = selection.selectAll('g.vertex').filter(filter).data(vertices, fastEntityKey); // exit
 
-           function setPlaceholder(values) {
+           groups.exit().remove(); // enter
 
-               if (isMulti || isSemi) {
-                   _staticPlaceholder = field.placeholder() || _t('inspector.add');
-               } else {
-                   var vals = values
-                       .map(function(d) { return d.value; })
-                       .filter(function(s) { return s.length < 20; });
+           var enter = groups.enter().append('g').attr('class', function (d) {
+             return 'node vertex ' + d.id;
+           }).order();
+           enter.append('circle').attr('class', 'shadow');
+           enter.append('circle').attr('class', 'stroke'); // Vertices with tags get a fill.
 
-                   var placeholders = vals.length > 1 ? vals : values.map(function(d) { return d.key; });
-                   _staticPlaceholder = field.placeholder() || placeholders.slice(0, 3).join(', ');
-               }
+           enter.filter(function (d) {
+             return d.hasInterestingTags();
+           }).append('circle').attr('class', 'fill'); // update
 
-               if (!/(…|\.\.\.)$/.test(_staticPlaceholder)) {
-                   _staticPlaceholder += '…';
-               }
+           groups = groups.merge(enter).attr('transform', svgPointTransform(projection)).classed('sibling', function (d) {
+             return d.id in sets.selected;
+           }).classed('shared', function (d) {
+             return graph.isShared(d);
+           }).classed('endpoint', function (d) {
+             return d.isEndpoint(graph);
+           }).classed('added', function (d) {
+             return !base.entities[d.id]; // if it doesn't exist in the base graph, it's new
+           }).classed('moved', function (d) {
+             return base.entities[d.id] && !fastDeepEqual(graph.entities[d.id].loc, base.entities[d.id].loc);
+           }).classed('retagged', function (d) {
+             return base.entities[d.id] && !fastDeepEqual(graph.entities[d.id].tags, base.entities[d.id].tags);
+           }).call(updateAttributes); // Vertices with icons get a `use`.
 
-               var ph;
-               if (!isMulti && !isSemi && _tags && Array.isArray(_tags[field.key])) {
-                   ph = _t('inspector.multiple_values');
-               } else {
-                   ph =  _staticPlaceholder;
-               }
+           var iconUse = groups.selectAll('.icon').data(function data(d) {
+             return zoom >= 17 && getIcon(d) ? [d] : [];
+           }, fastEntityKey); // exit
 
-               container.selectAll('input')
-                   .attr('placeholder', ph);
-           }
+           iconUse.exit().remove(); // enter
 
+           iconUse.enter().append('use').attr('class', 'icon').attr('width', '11px').attr('height', '11px').attr('transform', 'translate(-5.5, -5.5)').attr('xlink:href', function (d) {
+             var picon = getIcon(d);
+             var isMaki = /^maki-/.test(picon);
+             return '#' + picon + (isMaki ? '-11' : '');
+           }); // Vertices with directions get viewfields
 
-           function change() {
-               var t = {};
-               var val;
-
-               if (isMulti || isSemi) {
-                   val = tagValue(utilGetSetValue(input).replace(/,/g, ';')) || '';
-                   container.classed('active', false);
-                   utilGetSetValue(input, '');
-
-                   var vals = val.split(';').filter(Boolean);
-                   if (!vals.length) return;
-
-                   if (isMulti) {
-                       utilArrayUniq(vals).forEach(function(v) {
-                           var key = field.key + v;
-                           if (_tags) {
-                               // don't set a multicombo value to 'yes' if it already has a non-'no' value
-                               // e.g. `language:de=main`
-                               var old = _tags[key];
-                               if (typeof old === 'string' && old.toLowerCase() !== 'no') return;
-                           }
-                           key = context.cleanTagKey(key);
-                           field.keys.push(key);
-                           t[key] = 'yes';
-                       });
+           var dgroups = groups.selectAll('.viewfieldgroup').data(function data(d) {
+             return zoom >= 18 && getDirections(d) ? [d] : [];
+           }, fastEntityKey); // exit
 
-                   } else if (isSemi) {
-                       var arr = _multiData.map(function(d) { return d.key; });
-                       arr = arr.concat(vals);
-                       t[field.key] = context.cleanTagValue(utilArrayUniq(arr).filter(Boolean).join(';'));
-                   }
+           dgroups.exit().remove(); // enter/update
 
-                   window.setTimeout(function() { input.node().focus(); }, 10);
+           dgroups = dgroups.enter().insert('g', '.shadow').attr('class', 'viewfieldgroup').merge(dgroups);
+           var viewfields = dgroups.selectAll('.viewfield').data(getDirections, function key(d) {
+             return osmEntity.key(d);
+           }); // exit
 
-               } else {
-                   var rawValue = utilGetSetValue(input);
+           viewfields.exit().remove(); // enter/update
 
-                   // don't override multiple values with blank string
-                   if (!rawValue && Array.isArray(_tags[field.key])) return;
+           viewfields.enter().append('path').attr('class', 'viewfield').attr('d', 'M0,0H0').merge(viewfields).attr('marker-start', 'url(#ideditor-viewfield-marker' + (wireframe ? '-wireframe' : '') + ')').attr('transform', function (d) {
+             return 'rotate(' + d + ')';
+           });
+         }
 
-                   val = context.cleanTagValue(tagValue(rawValue));
-                   t[field.key] = val || undefined;
-               }
+         function drawTargets(selection, graph, entities, filter) {
+           var targetClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
+           var nopeClass = context.getDebug('target') ? 'red ' : 'nocolor ';
+           var getTransform = svgPointTransform(projection).geojson;
+           var activeID = context.activeID();
+           var data = {
+             targets: [],
+             nopes: []
+           };
+           entities.forEach(function (node) {
+             if (activeID === node.id) return; // draw no target on the activeID
 
-               dispatch$1.call('change', this, t);
-           }
+             var vertexType = svgPassiveVertex(node, graph, activeID);
 
+             if (vertexType !== 0) {
+               // passive or adjacent - allow to connect
+               data.targets.push({
+                 type: 'Feature',
+                 id: node.id,
+                 properties: {
+                   target: true,
+                   entity: node
+                 },
+                 geometry: node.asGeoJSON()
+               });
+             } else {
+               data.nopes.push({
+                 type: 'Feature',
+                 id: node.id + '-nope',
+                 properties: {
+                   nope: true,
+                   target: true,
+                   entity: node
+                 },
+                 geometry: node.asGeoJSON()
+               });
+             }
+           }); // Targets allow hover and vertex snapping
 
-           function removeMultikey(d) {
-               event.stopPropagation();
-               var t = {};
-               if (isMulti) {
-                   t[d.key] = undefined;
-               } else if (isSemi) {
-                   var arr = _multiData.map(function(md) {
-                       return md.key === d.key ? null : md.key;
-                   }).filter(Boolean);
+           var targets = selection.selectAll('.vertex.target-allowed').filter(function (d) {
+             return filter(d.properties.entity);
+           }).data(data.targets, function key(d) {
+             return d.id;
+           }); // exit
 
-                   arr = utilArrayUniq(arr);
-                   t[field.key] = arr.length ? arr.join(';') : undefined;
-               }
-               dispatch$1.call('change', this, t);
-           }
+           targets.exit().remove(); // enter/update
 
+           targets.enter().append('circle').attr('r', function (d) {
+             return _radii[d.id] || radiuses.shadow[3];
+           }).merge(targets).attr('class', function (d) {
+             return 'node vertex target target-allowed ' + targetClass + d.id;
+           }).attr('transform', getTransform); // NOPE
 
-           function combo(selection) {
-               container = selection.selectAll('.form-field-input-wrap')
-                   .data([0]);
+           var nopes = selection.selectAll('.vertex.target-nope').filter(function (d) {
+             return filter(d.properties.entity);
+           }).data(data.nopes, function key(d) {
+             return d.id;
+           }); // exit
 
-               var type = (isMulti || isSemi) ? 'multicombo': 'combo';
-               container = container.enter()
-                   .append('div')
-                   .attr('class', 'form-field-input-wrap form-field-input-' + type)
-                   .merge(container);
+           nopes.exit().remove(); // enter/update
 
-               if (isMulti || isSemi) {
-                   container = container.selectAll('.chiplist')
-                       .data([0]);
+           nopes.enter().append('circle').attr('r', function (d) {
+             return _radii[d.properties.entity.id] || radiuses.shadow[3];
+           }).merge(nopes).attr('class', function (d) {
+             return 'node vertex target target-nope ' + nopeClass + d.id;
+           }).attr('transform', getTransform);
+         } // Points can also render as vertices:
+         // 1. in wireframe mode or
+         // 2. at higher zooms if they have a direction
 
-                   var listClass = 'chiplist';
 
-                   // Use a separate line for each value in the Destinations field
-                   // to mimic highway exit signs
-                   if (field.key === 'destination') {
-                       listClass += ' full-line-chips';
-                   }
+         function renderAsVertex(entity, graph, wireframe, zoom) {
+           var geometry = entity.geometry(graph);
+           return geometry === 'vertex' || geometry === 'point' && (wireframe || zoom >= 18 && entity.directions(graph, projection).length);
+         }
 
-                   container = container.enter()
-                       .append('ul')
-                       .attr('class', listClass)
-                       .on('click', function() {
-                           window.setTimeout(function() { input.node().focus(); }, 10);
-                       })
-                       .merge(container);
+         function isEditedNode(node, base, head) {
+           var baseNode = base.entities[node.id];
+           var headNode = head.entities[node.id];
+           return !headNode || !baseNode || !fastDeepEqual(headNode.tags, baseNode.tags) || !fastDeepEqual(headNode.loc, baseNode.loc);
+         }
 
+         function getSiblingAndChildVertices(ids, graph, wireframe, zoom) {
+           var results = {};
+           var seenIds = {};
 
-                   inputWrap = container.selectAll('.input-wrap')
-                       .data([0]);
+           function addChildVertices(entity) {
+             // avoid redundant work and infinite recursion of circular relations
+             if (seenIds[entity.id]) return;
+             seenIds[entity.id] = true;
+             var geometry = entity.geometry(graph);
 
-                   inputWrap = inputWrap.enter()
-                       .append('li')
-                       .attr('class', 'input-wrap')
-                       .merge(inputWrap);
+             if (!context.features().isHiddenFeature(entity, graph, geometry)) {
+               var i;
 
-                   input = inputWrap.selectAll('input')
-                       .data([0]);
-               } else {
-                   input = container.selectAll('input')
-                       .data([0]);
-               }
-
-               input = input.enter()
-                   .append('input')
-                   .attr('type', 'text')
-                   .attr('id', field.domId)
-                   .call(utilNoAuto)
-                   .call(initCombo, selection)
-                   .merge(input);
-
-               if (isNetwork) {
-                   var extent = combinedEntityExtent();
-                   var countryCode = extent && iso1A2Code(extent.center());
-                   _countryCode = countryCode && countryCode.toLowerCase();
-               }
-
-               input
-                   .on('change', change)
-                   .on('blur', change);
-
-               input
-                   .on('keydown.field', function() {
-                       switch (event.keyCode) {
-                           case 13: // ↩ Return
-                               input.node().blur(); // blurring also enters the value
-                               event.stopPropagation();
-                               break;
-                       }
-                   });
+               if (entity.type === 'way') {
+                 for (i = 0; i < entity.nodes.length; i++) {
+                   var child = graph.hasEntity(entity.nodes[i]);
 
-               if (isMulti || isSemi) {
-                   combobox
-                       .on('accept', function() {
-                           input.node().blur();
-                           input.node().focus();
-                       });
+                   if (child) {
+                     addChildVertices(child);
+                   }
+                 }
+               } else if (entity.type === 'relation') {
+                 for (i = 0; i < entity.members.length; i++) {
+                   var member = graph.hasEntity(entity.members[i].id);
 
-                   input
-                       .on('focus', function() { container.classed('active', true); });
+                   if (member) {
+                     addChildVertices(member);
+                   }
+                 }
+               } else if (renderAsVertex(entity, graph, wireframe, zoom)) {
+                 results[entity.id] = entity;
                }
+             }
            }
 
+           ids.forEach(function (id) {
+             var entity = graph.hasEntity(id);
+             if (!entity) return;
 
-           combo.tags = function(tags) {
-               _tags = tags;
-
-               if (isMulti || isSemi) {
-                   _multiData = [];
+             if (entity.type === 'node') {
+               if (renderAsVertex(entity, graph, wireframe, zoom)) {
+                 results[entity.id] = entity;
+                 graph.parentWays(entity).forEach(function (entity) {
+                   addChildVertices(entity);
+                 });
+               }
+             } else {
+               // way, relation
+               addChildVertices(entity);
+             }
+           });
+           return results;
+         }
 
-                   var maxLength;
+         function drawVertices(selection, graph, entities, filter, extent, fullRedraw) {
+           var wireframe = context.surface().classed('fill-wireframe');
+           var visualDiff = context.surface().classed('highlight-edited');
+           var zoom = geoScaleToZoom(projection.scale());
+           var mode = context.mode();
+           var isMoving = mode && /^(add|draw|drag|move|rotate)/.test(mode.id);
+           var base = context.history().base();
+           var drawLayer = selection.selectAll('.layer-osm.points .points-group.vertices');
+           var touchLayer = selection.selectAll('.layer-touch.points');
 
-                   if (isMulti) {
-                       // Build _multiData array containing keys already set..
-                       for (var k in tags) {
-                           if (k.indexOf(field.key) !== 0) continue;
-                           var v = tags[k];
-                           if (!v || (typeof v === 'string' && v.toLowerCase() === 'no')) continue;
+           if (fullRedraw) {
+             _currPersistent = {};
+             _radii = {};
+           } // Collect important vertices from the `entities` list..
+           // (during a partial redraw, it will not contain everything)
 
-                           var suffix = k.substring(field.key.length);
-                           _multiData.push({
-                               key: k,
-                               value: displayValue(suffix),
-                               isMixed: Array.isArray(v)
-                           });
-                       }
 
-                       // Set keys for form-field modified (needed for undo and reset buttons)..
-                       field.keys = _multiData.map(function(d) { return d.key; });
+           for (var i = 0; i < entities.length; i++) {
+             var entity = entities[i];
+             var geometry = entity.geometry(graph);
+             var keep = false; // a point that looks like a vertex..
 
-                       // limit the input length so it fits after prepending the key prefix
-                       maxLength = context.maxCharsForTagKey() - utilUnicodeCharsCount(field.key);
+             if (geometry === 'point' && renderAsVertex(entity, graph, wireframe, zoom)) {
+               _currPersistent[entity.id] = entity;
+               keep = true; // a vertex of some importance..
+             } else if (geometry === 'vertex' && (entity.hasInterestingTags() || entity.isEndpoint(graph) || entity.isConnected(graph) || visualDiff && isEditedNode(entity, base, graph))) {
+               _currPersistent[entity.id] = entity;
+               keep = true;
+             } // whatever this is, it's not a persistent vertex..
 
-                   } else if (isSemi) {
 
-                       var allValues = [];
-                       var commonValues;
-                       if (Array.isArray(tags[field.key])) {
+             if (!keep && !fullRedraw) {
+               delete _currPersistent[entity.id];
+             }
+           } // 3 sets of vertices to consider:
 
-                           tags[field.key].forEach(function(tagVal) {
-                               var thisVals = utilArrayUniq((tagVal || '').split(';')).filter(Boolean);
-                               allValues = allValues.concat(thisVals);
-                               if (!commonValues) {
-                                   commonValues = thisVals;
-                               } else {
-                                   commonValues = commonValues.filter(value => thisVals.includes(value));
-                               }
-                           });
-                           allValues = utilArrayUniq(allValues).filter(Boolean);
 
-                       } else {
-                           allValues =  utilArrayUniq((tags[field.key] || '').split(';')).filter(Boolean);
-                           commonValues = allValues;
-                       }
+           var sets = {
+             persistent: _currPersistent,
+             // persistent = important vertices (render always)
+             selected: _currSelected,
+             // selected + siblings of selected (render always)
+             hovered: _currHover // hovered + siblings of hovered (render only in draw modes)
 
-                       _multiData = allValues.map(function(v) {
-                           return {
-                               key: v,
-                               value: displayValue(v),
-                               isMixed: !commonValues.includes(v)
-                           };
-                       });
+           };
+           var all = Object.assign({}, isMoving ? _currHover : {}, _currSelected, _currPersistent); // Draw the vertices..
+           // The filter function controls the scope of what objects d3 will touch (exit/enter/update)
+           // Adjust the filter function to expand the scope beyond whatever entities were passed in.
 
-                       var currLength = utilUnicodeCharsCount(commonValues.join(';'));
+           var filterRendered = function filterRendered(d) {
+             return d.id in _currPersistent || d.id in _currSelected || d.id in _currHover || filter(d);
+           };
 
-                       // limit the input length to the remaining available characters
-                       maxLength = context.maxCharsForTagValue() - currLength;
+           drawLayer.call(draw, graph, currentVisible(all), sets, filterRendered); // Draw touch targets..
+           // When drawing, render all targets (not just those affected by a partial redraw)
 
-                       if (currLength > 0) {
-                           // account for the separator if a new value will be appended to existing
-                           maxLength -= 1;
-                       }
-                   }
-                   // a negative maxlength doesn't make sense
-                   maxLength = Math.max(0, maxLength);
+           var filterTouch = function filterTouch(d) {
+             return isMoving ? true : filterRendered(d);
+           };
 
-                   var allowDragAndDrop = isSemi // only semiCombo values are ordered
-                       && !Array.isArray(tags[field.key]);
+           touchLayer.call(drawTargets, graph, currentVisible(all), filterTouch);
 
-                   // Exclude existing multikeys from combo options..
-                   var available = objectDifference(_comboData, _multiData);
-                   combobox.data(available);
+           function currentVisible(which) {
+             return Object.keys(which).map(graph.hasEntity, graph) // the current version of this entity
+             .filter(function (entity) {
+               return entity && entity.intersects(extent, graph);
+             });
+           }
+         } // partial redraw - only update the selected items..
 
-                   // Hide 'Add' button if this field uses fixed set of
-                   // translateable optstrings and they're all currently used,
-                   // or if the field is already at its character limit
-                   var hideAdd = (optstrings && !available.length) || maxLength <= 0;
-                   container.selectAll('.chiplist .input-wrap')
-                       .style('display', hideAdd ? 'none' : null);
 
+         drawVertices.drawSelected = function (selection, graph, extent) {
+           var wireframe = context.surface().classed('fill-wireframe');
+           var zoom = geoScaleToZoom(projection.scale());
+           _prevSelected = _currSelected || {};
 
-                   // Render chips
-                   var chips = container.selectAll('.chip')
-                       .data(_multiData);
+           if (context.map().isInWideSelection()) {
+             _currSelected = {};
+             context.selectedIDs().forEach(function (id) {
+               var entity = graph.hasEntity(id);
+               if (!entity) return;
 
-                   chips.exit()
-                       .remove();
+               if (entity.type === 'node') {
+                 if (renderAsVertex(entity, graph, wireframe, zoom)) {
+                   _currSelected[entity.id] = entity;
+                 }
+               }
+             });
+           } else {
+             _currSelected = getSiblingAndChildVertices(context.selectedIDs(), graph, wireframe, zoom);
+           } // note that drawVertices will add `_currSelected` automatically if needed..
 
-                   var enter = chips.enter()
-                       .insert('li', '.input-wrap')
-                       .attr('class', 'chip');
 
-                   enter.append('span');
-                   enter.append('a');
+           var filter = function filter(d) {
+             return d.id in _prevSelected;
+           };
 
-                   chips = chips.merge(enter)
-                       .order()
-                       .classed('draggable', allowDragAndDrop)
-                       .classed('mixed', function(d) {
-                           return d.isMixed;
-                       })
-                       .attr('title', function(d) {
-                           return d.isMixed ? _t('inspector.unshared_value_tooltip') : null;
-                       });
+           drawVertices(selection, graph, Object.values(_prevSelected), filter, extent, false);
+         }; // partial redraw - only update the hovered items..
 
-                   if (allowDragAndDrop) {
-                       registerDragAndDrop(chips);
-                   }
 
-                   chips.select('span')
-                       .text(function(d) { return d.value; });
+         drawVertices.drawHover = function (selection, graph, target, extent) {
+           if (target === _currHoverTarget) return; // continue only if something changed
 
-                   chips.select('a')
-                       .on('click', removeMultikey)
-                       .attr('class', 'remove')
-                       .text('×');
+           var wireframe = context.surface().classed('fill-wireframe');
+           var zoom = geoScaleToZoom(projection.scale());
+           _prevHover = _currHover || {};
+           _currHoverTarget = target;
+           var entity = target && target.properties && target.properties.entity;
 
-               } else {
-                   var isMixed = Array.isArray(tags[field.key]);
+           if (entity) {
+             _currHover = getSiblingAndChildVertices([entity.id], graph, wireframe, zoom);
+           } else {
+             _currHover = {};
+           } // note that drawVertices will add `_currHover` automatically if needed..
 
-                   var mixedValues = isMixed && tags[field.key].map(function(val) {
-                       return displayValue(val);
-                   }).filter(Boolean);
 
-                   utilGetSetValue(input, !isMixed ? displayValue(tags[field.key]) : '')
-                       .attr('title', isMixed ? mixedValues.join('\n') : undefined)
-                       .attr('placeholder', isMixed ? _t('inspector.multiple_values') : _staticPlaceholder || '')
-                       .classed('mixed', isMixed);
-               }
+           var filter = function filter(d) {
+             return d.id in _prevHover;
            };
 
-           function registerDragAndDrop(selection) {
+           drawVertices(selection, graph, Object.values(_prevHover), filter, extent, false);
+         };
 
-               // allow drag and drop re-ordering of chips
-               var dragOrigin, targetIndex;
-               selection.call(d3_drag()
-                   .on('start', function() {
-                       dragOrigin = {
-                           x: event.x,
-                           y: event.y
-                       };
-                       targetIndex = null;
-                   })
-                   .on('drag', function(d, index) {
-                       var x = event.x - dragOrigin.x,
-                           y = event.y - dragOrigin.y;
-
-                       if (!select(this).classed('dragging') &&
-                           // don't display drag until dragging beyond a distance threshold
-                           Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2)) <= 5) return;
-
-                       select(this)
-                           .classed('dragging', true);
-
-                       targetIndex = null;
-                       var targetIndexOffsetTop = null;
-                       var draggedTagWidth = select(this).node().offsetWidth;
-
-                       if (field.key === 'destination') { // meaning tags are full width
-                           container.selectAll('.chip')
-                               .style('transform', function(d2, index2) {
-                                   var node = select(this).node();
-
-                                   if (index === index2) {
-                                       return 'translate(' + x + 'px, ' + y + 'px)';
-                                   // move the dragged tag up the order
-                                   } else if (index2 > index && event.y > node.offsetTop) {
-                                       if (targetIndex === null || index2 > targetIndex) {
-                                           targetIndex = index2;
-                                       }
-                                       return 'translateY(-100%)';
-                                   // move the dragged tag down the order
-                                   } else if (index2 < index && event.y < node.offsetTop + node.offsetHeight) {
-                                       if (targetIndex === null || index2 < targetIndex) {
-                                           targetIndex = index2;
-                                       }
-                                       return 'translateY(100%)';
-                                   }
-                                   return null;
-                               });
-                       } else {
-                           container.selectAll('.chip')
-                               .each(function(d2, index2) {
-                                   var node = select(this).node();
-
-                                   // check the cursor is in the bounding box
-                                   if (
-                                       index !== index2 &&
-                                       event.x < node.offsetLeft + node.offsetWidth + 5 &&
-                                       event.x > node.offsetLeft &&
-                                       event.y < node.offsetTop + node.offsetHeight &&
-                                       event.y > node.offsetTop
-                                   ) {
-                                       targetIndex = index2;
-                                       targetIndexOffsetTop = node.offsetTop;
-                                   }
-                               })
-                               .style('transform', function(d2, index2) {
-                                   var node = select(this).node();
-
-                                   if (index === index2) {
-                                       return 'translate(' + x + 'px, ' + y + 'px)';
-                                   }
-
-                                   // only translate tags in the same row
-                                   if (node.offsetTop === targetIndexOffsetTop) {
-                                       if (index2 < index && index2 >= targetIndex) {
-                                           return 'translateX(' + draggedTagWidth + 'px)';
-                                       } else if (index2 > index && index2 <= targetIndex) {
-                                           return 'translateX(-' + draggedTagWidth + 'px)';
-                                       }
-                                   }
-                                   return null;
-                               });
-                           }
-                   })
-                   .on('end', function(d, index) {
-                       if (!select(this).classed('dragging')) {
-                           return;
-                       }
+         return drawVertices;
+       }
 
-                       select(this)
-                           .classed('dragging', false);
+       function utilBindOnce(target, type, listener, capture) {
+         var typeOnce = type + '.once';
 
-                       container.selectAll('.chip')
-                           .style('transform', null);
+         function one() {
+           target.on(typeOnce, null);
+           listener.apply(this, arguments);
+         }
 
-                       if (typeof targetIndex === 'number') {
-                           var element = _multiData[index];
-                           _multiData.splice(index, 1);
-                           _multiData.splice(targetIndex, 0, element);
+         target.on(typeOnce, one, capture);
+         return this;
+       }
 
-                           var t = {};
+       function defaultFilter$2(d3_event) {
+         return !d3_event.ctrlKey && !d3_event.button;
+       }
 
-                           if (_multiData.length) {
-                               t[field.key] = _multiData.map(function(element) {
-                                   return element.key;
-                               }).join(';');
-                           } else {
-                               t[field.key] = undefined;
-                           }
+       function defaultExtent$1() {
+         var e = this;
 
-                           dispatch$1.call('change', this, t);
-                       }
-                       dragOrigin = undefined;
-                       targetIndex = undefined;
-                   })
-               );
+         if (e instanceof SVGElement) {
+           e = e.ownerSVGElement || e;
+
+           if (e.hasAttribute('viewBox')) {
+             e = e.viewBox.baseVal;
+             return [[e.x, e.y], [e.x + e.width, e.y + e.height]];
            }
 
+           return [[0, 0], [e.width.baseVal.value, e.height.baseVal.value]];
+         }
 
-           combo.focus = function() {
-               input.node().focus();
-           };
+         return [[0, 0], [e.clientWidth, e.clientHeight]];
+       }
 
+       function defaultWheelDelta$1(d3_event) {
+         return -d3_event.deltaY * (d3_event.deltaMode === 1 ? 0.05 : d3_event.deltaMode ? 1 : 0.002);
+       }
 
-           combo.entityIDs = function(val) {
-               if (!arguments.length) return _entityIDs;
-               _entityIDs = val;
-               return combo;
-           };
+       function defaultConstrain$1(transform, extent, translateExtent) {
+         var dx0 = transform.invertX(extent[0][0]) - translateExtent[0][0],
+             dx1 = transform.invertX(extent[1][0]) - translateExtent[1][0],
+             dy0 = transform.invertY(extent[0][1]) - translateExtent[0][1],
+             dy1 = transform.invertY(extent[1][1]) - translateExtent[1][1];
+         return transform.translate(dx1 > dx0 ? (dx0 + dx1) / 2 : Math.min(0, dx0) || Math.max(0, dx1), dy1 > dy0 ? (dy0 + dy1) / 2 : Math.min(0, dy0) || Math.max(0, dy1));
+       }
 
+       function utilZoomPan() {
+         var filter = defaultFilter$2,
+             extent = defaultExtent$1,
+             constrain = defaultConstrain$1,
+             wheelDelta = defaultWheelDelta$1,
+             scaleExtent = [0, Infinity],
+             translateExtent = [[-Infinity, -Infinity], [Infinity, Infinity]],
+             interpolate = interpolateZoom,
+             dispatch$1 = dispatch('start', 'zoom', 'end'),
+             _wheelDelay = 150,
+             _transform = identity$2,
+             _activeGesture;
 
-           function combinedEntityExtent() {
-               return _entityIDs && _entityIDs.length && utilTotalExtent(_entityIDs, context.graph());
-           }
+         function zoom(selection) {
+           selection.on('pointerdown.zoom', pointerdown).on('wheel.zoom', wheeled).style('touch-action', 'none').style('-webkit-tap-highlight-color', 'rgba(0,0,0,0)');
+           select(window).on('pointermove.zoompan', pointermove).on('pointerup.zoompan pointercancel.zoompan', pointerup);
+         }
 
+         zoom.transform = function (collection, transform, point) {
+           var selection = collection.selection ? collection.selection() : collection;
 
-           return utilRebind(combo, dispatch$1, 'on');
-       }
+           if (collection !== selection) {
+             schedule(collection, transform, point);
+           } else {
+             selection.interrupt().each(function () {
+               gesture(this, arguments).start(null).zoom(null, null, typeof transform === 'function' ? transform.apply(this, arguments) : transform).end(null);
+             });
+           }
+         };
 
-       function uiFieldText(field, context) {
-           var dispatch$1 = dispatch('change');
-           var input = select(null);
-           var outlinkButton = select(null);
-           var _entityIDs = [];
-           var _tags;
-           var _phoneFormats = {};
+         zoom.scaleBy = function (selection, k, p) {
+           zoom.scaleTo(selection, function () {
+             var k0 = _transform.k,
+                 k1 = typeof k === 'function' ? k.apply(this, arguments) : k;
+             return k0 * k1;
+           }, p);
+         };
 
-           if (field.type === 'tel') {
-               _mainFileFetcher.get('phone_formats')
-                   .then(function(d) {
-                       _phoneFormats = d;
-                       updatePhonePlaceholder();
-                   })
-                   .catch(function() { /* ignore */ });
-           }
+         zoom.scaleTo = function (selection, k, p) {
+           zoom.transform(selection, function () {
+             var e = extent.apply(this, arguments),
+                 t0 = _transform,
+                 p0 = !p ? centroid(e) : typeof p === 'function' ? p.apply(this, arguments) : p,
+                 p1 = t0.invert(p0),
+                 k1 = typeof k === 'function' ? k.apply(this, arguments) : k;
+             return constrain(translate(scale(t0, k1), p0, p1), e, translateExtent);
+           }, p);
+         };
 
-           function i(selection) {
-               var entity = _entityIDs.length && context.hasEntity(_entityIDs[0]);
-               var preset = entity && _mainPresetIndex.match(entity, context.graph());
-               var isLocked = preset && preset.suggestion && field.id === 'brand';
-               field.locked(isLocked);
+         zoom.translateBy = function (selection, x, y) {
+           zoom.transform(selection, function () {
+             return constrain(_transform.translate(typeof x === 'function' ? x.apply(this, arguments) : x, typeof y === 'function' ? y.apply(this, arguments) : y), extent.apply(this, arguments), translateExtent);
+           });
+         };
 
-               var wrap = selection.selectAll('.form-field-input-wrap')
-                   .data([0]);
+         zoom.translateTo = function (selection, x, y, p) {
+           zoom.transform(selection, function () {
+             var e = extent.apply(this, arguments),
+                 t = _transform,
+                 p0 = !p ? centroid(e) : typeof p === 'function' ? p.apply(this, arguments) : p;
+             return constrain(identity$2.translate(p0[0], p0[1]).scale(t.k).translate(typeof x === 'function' ? -x.apply(this, arguments) : -x, typeof y === 'function' ? -y.apply(this, arguments) : -y), e, translateExtent);
+           }, p);
+         };
 
-               wrap = wrap.enter()
-                   .append('div')
-                   .attr('class', 'form-field-input-wrap form-field-input-' + field.type)
-                   .merge(wrap);
+         function scale(transform, k) {
+           k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], k));
+           return k === transform.k ? transform : new Transform(k, transform.x, transform.y);
+         }
 
-               input = wrap.selectAll('input')
-                   .data([0]);
+         function translate(transform, p0, p1) {
+           var x = p0[0] - p1[0] * transform.k,
+               y = p0[1] - p1[1] * transform.k;
+           return x === transform.x && y === transform.y ? transform : new Transform(transform.k, x, y);
+         }
 
-               input = input.enter()
-                   .append('input')
-                   .attr('type', field.type === 'identifier' ? 'text' : field.type)
-                   .attr('id', field.domId)
-                   .classed(field.type, true)
-                   .call(utilNoAuto)
-                   .merge(input);
+         function centroid(extent) {
+           return [(+extent[0][0] + +extent[1][0]) / 2, (+extent[0][1] + +extent[1][1]) / 2];
+         }
 
-               input
-                   .classed('disabled', !!isLocked)
-                   .attr('readonly', isLocked || null)
-                   .on('input', change(true))
-                   .on('blur', change())
-                   .on('change', change());
+         function schedule(transition, transform, point) {
+           transition.on('start.zoom', function () {
+             gesture(this, arguments).start(null);
+           }).on('interrupt.zoom end.zoom', function () {
+             gesture(this, arguments).end(null);
+           }).tween('zoom', function () {
+             var that = this,
+                 args = arguments,
+                 g = gesture(that, args),
+                 e = extent.apply(that, args),
+                 p = !point ? centroid(e) : typeof point === 'function' ? point.apply(that, args) : point,
+                 w = Math.max(e[1][0] - e[0][0], e[1][1] - e[0][1]),
+                 a = _transform,
+                 b = typeof transform === 'function' ? transform.apply(that, args) : transform,
+                 i = interpolate(a.invert(p).concat(w / a.k), b.invert(p).concat(w / b.k));
+             return function (t) {
+               if (t === 1) t = b; // Avoid rounding error on end.
+               else {
+                   var l = i(t),
+                       k = w / l[2];
+                   t = new Transform(k, p[0] - l[0] * k, p[1] - l[1] * k);
+                 }
+               g.zoom(null, null, t);
+             };
+           });
+         }
 
+         function gesture(that, args, clean) {
+           return !clean && _activeGesture || new Gesture(that, args);
+         }
 
-               if (field.type === 'tel') {
-                   updatePhonePlaceholder();
+         function Gesture(that, args) {
+           this.that = that;
+           this.args = args;
+           this.active = 0;
+           this.extent = extent.apply(that, args);
+         }
 
-               } else if (field.type === 'number') {
-                   var rtl = (_mainLocalizer.textDirection() === 'rtl');
+         Gesture.prototype = {
+           start: function start(d3_event) {
+             if (++this.active === 1) {
+               _activeGesture = this;
+               dispatch$1.call('start', this, d3_event);
+             }
 
-                   input.attr('type', 'text');
+             return this;
+           },
+           zoom: function zoom(d3_event, key, transform) {
+             if (this.mouse && key !== 'mouse') this.mouse[1] = transform.invert(this.mouse[0]);
+             if (this.pointer0 && key !== 'touch') this.pointer0[1] = transform.invert(this.pointer0[0]);
+             if (this.pointer1 && key !== 'touch') this.pointer1[1] = transform.invert(this.pointer1[0]);
+             _transform = transform;
+             dispatch$1.call('zoom', this, d3_event, key, transform);
+             return this;
+           },
+           end: function end(d3_event) {
+             if (--this.active === 0) {
+               _activeGesture = null;
+               dispatch$1.call('end', this, d3_event);
+             }
 
-                   var buttons = wrap.selectAll('.increment, .decrement')
-                       .data(rtl ? [1, -1] : [-1, 1]);
+             return this;
+           }
+         };
 
-                   buttons.enter()
-                       .append('button')
-                       .attr('tabindex', -1)
-                       .attr('class', function(d) {
-                           var which = (d === 1 ? 'increment' : 'decrement');
-                           return 'form-field-button ' + which;
-                       })
-                       .merge(buttons)
-                       .on('click', function(d) {
-                           event.preventDefault();
-                           var raw_vals = input.node().value || '0';
-                           var vals = raw_vals.split(';');
-                           vals = vals.map(function(v) {
-                               var num = parseFloat(v.trim(), 10);
-                               return isFinite(num) ? clamped(num + d) : v.trim();
-                           });
-                           input.node().value = vals.join(';');
-                           change()();
-                       });
-               } else if (field.type === 'identifier' && field.urlFormat && field.pattern) {
+         function wheeled(d3_event) {
+           if (!filter.apply(this, arguments)) return;
+           var g = gesture(this, arguments),
+               t = _transform,
+               k = Math.max(scaleExtent[0], Math.min(scaleExtent[1], t.k * Math.pow(2, wheelDelta.apply(this, arguments)))),
+               p = utilFastMouse(this)(d3_event); // If the mouse is in the same location as before, reuse it.
+           // If there were recent wheel events, reset the wheel idle timeout.
 
-                   input.attr('type', 'text');
+           if (g.wheel) {
+             if (g.mouse[0][0] !== p[0] || g.mouse[0][1] !== p[1]) {
+               g.mouse[1] = t.invert(g.mouse[0] = p);
+             }
 
-                   outlinkButton = wrap.selectAll('.foreign-id-permalink')
-                       .data([0]);
+             clearTimeout(g.wheel); // Otherwise, capture the mouse point and location at the start.
+           } else {
+             g.mouse = [p, t.invert(p)];
+             interrupt(this);
+             g.start(d3_event);
+           }
 
-                   outlinkButton.enter()
-                       .append('button')
-                       .attr('tabindex', -1)
-                       .call(svgIcon('#iD-icon-out-link'))
-                       .attr('class', 'form-field-button foreign-id-permalink')
-                       .attr('title', function() {
-                           var domainResults = /^https?:\/\/(.{1,}?)\//.exec(field.urlFormat);
-                           if (domainResults.length >= 2 && domainResults[1]) {
-                               var domain = domainResults[1];
-                               return _t('icons.view_on', { domain: domain });
-                           }
-                           return '';
-                       })
-                       .on('click', function() {
-                           event.preventDefault();
+           d3_event.preventDefault();
+           d3_event.stopImmediatePropagation();
+           g.wheel = setTimeout(wheelidled, _wheelDelay);
+           g.zoom(d3_event, 'mouse', constrain(translate(scale(t, k), g.mouse[0], g.mouse[1]), g.extent, translateExtent));
 
-                           var value = validIdentifierValueForLink();
-                           if (value) {
-                               var url = field.urlFormat.replace(/{value}/, encodeURIComponent(value));
-                               window.open(url, '_blank');
-                           }
-                       })
-                       .merge(outlinkButton);
-               }
+           function wheelidled() {
+             g.wheel = null;
+             g.end(d3_event);
            }
+         }
 
+         var _downPointerIDs = new Set();
 
-           function updatePhonePlaceholder() {
-               if (input.empty() || !Object.keys(_phoneFormats).length) return;
+         var _pointerLocGetter;
 
-               var extent = combinedEntityExtent();
-               var countryCode = extent && iso1A2Code(extent.center());
-               var format = countryCode && _phoneFormats[countryCode.toLowerCase()];
-               if (format) input.attr('placeholder', format);
-           }
+         function pointerdown(d3_event) {
+           _downPointerIDs.add(d3_event.pointerId);
 
+           if (!filter.apply(this, arguments)) return;
+           var g = gesture(this, arguments, _downPointerIDs.size === 1);
+           var started;
+           d3_event.stopImmediatePropagation();
+           _pointerLocGetter = utilFastMouse(this);
 
-           function validIdentifierValueForLink() {
-               if (field.type === 'identifier' && field.pattern) {
-                   var value = utilGetSetValue(input).trim().split(';')[0];
-                   return value && value.match(new RegExp(field.pattern));
-               }
-               return null;
-           }
+           var loc = _pointerLocGetter(d3_event);
 
+           var p = [loc, _transform.invert(loc), d3_event.pointerId];
 
-           // clamp number to min/max
-           function clamped(num) {
-               if (field.minValue !== undefined) {
-                   num = Math.max(num, field.minValue);
-               }
-               if (field.maxValue !== undefined) {
-                   num = Math.min(num, field.maxValue);
-               }
-               return num;
+           if (!g.pointer0) {
+             g.pointer0 = p;
+             started = true;
+           } else if (!g.pointer1 && g.pointer0[2] !== p[2]) {
+             g.pointer1 = p;
            }
 
-
-           function change(onInput) {
-               return function() {
-                   var t = {};
-                   var val = utilGetSetValue(input);
-                   if (!onInput) val = context.cleanTagValue(val);
-
-                   // don't override multiple values with blank string
-                   if (!val && Array.isArray(_tags[field.key])) return;
-
-                   if (!onInput) {
-                       if (field.type === 'number' && val) {
-                           var vals = val.split(';');
-                           vals = vals.map(function(v) {
-                               var num = parseFloat(v.trim(), 10);
-                               return isFinite(num) ? clamped(num) : v.trim();
-                           });
-                           val = vals.join(';');
-                       }
-                       utilGetSetValue(input, val);
-                   }
-                   t[field.key] = val || undefined;
-                   dispatch$1.call('change', this, t, onInput);
-               };
+           if (started) {
+             interrupt(this);
+             g.start(d3_event);
            }
+         }
 
+         function pointermove(d3_event) {
+           if (!_downPointerIDs.has(d3_event.pointerId)) return;
+           if (!_activeGesture || !_pointerLocGetter) return;
+           var g = gesture(this, arguments);
+           var isPointer0 = g.pointer0 && g.pointer0[2] === d3_event.pointerId;
+           var isPointer1 = !isPointer0 && g.pointer1 && g.pointer1[2] === d3_event.pointerId;
 
-           i.entityIDs = function(val) {
-               if (!arguments.length) return _entityIDs;
-               _entityIDs = val;
-               return i;
-           };
+           if ((isPointer0 || isPointer1) && 'buttons' in d3_event && !d3_event.buttons) {
+             // The pointer went up without ending the gesture somehow, e.g.
+             // a down mouse was moved off the map and released. End it here.
+             if (g.pointer0) _downPointerIDs["delete"](g.pointer0[2]);
+             if (g.pointer1) _downPointerIDs["delete"](g.pointer1[2]);
+             g.end(d3_event);
+             return;
+           }
+
+           d3_event.preventDefault();
+           d3_event.stopImmediatePropagation();
 
+           var loc = _pointerLocGetter(d3_event);
 
-           i.tags = function(tags) {
-               _tags = tags;
+           var t, p, l;
+           if (isPointer0) g.pointer0[0] = loc;else if (isPointer1) g.pointer1[0] = loc;
+           t = _transform;
 
-               var isMixed = Array.isArray(tags[field.key]);
+           if (g.pointer1) {
+             var p0 = g.pointer0[0],
+                 l0 = g.pointer0[1],
+                 p1 = g.pointer1[0],
+                 l1 = g.pointer1[1],
+                 dp = (dp = p1[0] - p0[0]) * dp + (dp = p1[1] - p0[1]) * dp,
+                 dl = (dl = l1[0] - l0[0]) * dl + (dl = l1[1] - l0[1]) * dl;
+             t = scale(t, Math.sqrt(dp / dl));
+             p = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2];
+             l = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2];
+           } else if (g.pointer0) {
+             p = g.pointer0[0];
+             l = g.pointer0[1];
+           } else return;
 
-               utilGetSetValue(input, !isMixed && tags[field.key] ? tags[field.key] : '')
-                   .attr('title', isMixed ? tags[field.key].filter(Boolean).join('\n') : undefined)
-                   .attr('placeholder', isMixed ? _t('inspector.multiple_values') : (field.placeholder() || _t('inspector.unknown')))
-                   .classed('mixed', isMixed);
+           g.zoom(d3_event, 'touch', constrain(translate(t, p, l), g.extent, translateExtent));
+         }
 
-               if (outlinkButton && !outlinkButton.empty()) {
-                   var disabled = !validIdentifierValueForLink();
-                   outlinkButton.classed('disabled', disabled);
-               }
-           };
+         function pointerup(d3_event) {
+           if (!_downPointerIDs.has(d3_event.pointerId)) return;
 
+           _downPointerIDs["delete"](d3_event.pointerId);
 
-           i.focus = function() {
-               var node = input.node();
-               if (node) node.focus();
-           };
+           if (!_activeGesture) return;
+           var g = gesture(this, arguments);
+           d3_event.stopImmediatePropagation();
+           if (g.pointer0 && g.pointer0[2] === d3_event.pointerId) delete g.pointer0;else if (g.pointer1 && g.pointer1[2] === d3_event.pointerId) delete g.pointer1;
 
-           function combinedEntityExtent() {
-               return _entityIDs && _entityIDs.length && utilTotalExtent(_entityIDs, context.graph());
+           if (g.pointer1 && !g.pointer0) {
+             g.pointer0 = g.pointer1;
+             delete g.pointer1;
            }
 
-           return utilRebind(i, dispatch$1, 'on');
-       }
+           if (g.pointer0) g.pointer0[1] = _transform.invert(g.pointer0[0]);else {
+             g.end(d3_event);
+           }
+         }
 
-       function uiFieldAccess(field, context) {
-           var dispatch$1 = dispatch('change');
-           var items = select(null);
-           var _tags;
+         zoom.wheelDelta = function (_) {
+           return arguments.length ? (wheelDelta = utilFunctor(+_), zoom) : wheelDelta;
+         };
 
-           function access(selection) {
-               var wrap = selection.selectAll('.form-field-input-wrap')
-                   .data([0]);
+         zoom.filter = function (_) {
+           return arguments.length ? (filter = utilFunctor(!!_), zoom) : filter;
+         };
 
-               wrap = wrap.enter()
-                   .append('div')
-                   .attr('class', 'form-field-input-wrap form-field-input-' + field.type)
-                   .merge(wrap);
+         zoom.extent = function (_) {
+           return arguments.length ? (extent = utilFunctor([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), zoom) : extent;
+         };
 
-               var list = wrap.selectAll('ul')
-                   .data([0]);
+         zoom.scaleExtent = function (_) {
+           return arguments.length ? (scaleExtent[0] = +_[0], scaleExtent[1] = +_[1], zoom) : [scaleExtent[0], scaleExtent[1]];
+         };
 
-               list = list.enter()
-                   .append('ul')
-                   .attr('class', 'rows')
-                   .merge(list);
+         zoom.translateExtent = function (_) {
+           return arguments.length ? (translateExtent[0][0] = +_[0][0], translateExtent[1][0] = +_[1][0], translateExtent[0][1] = +_[0][1], translateExtent[1][1] = +_[1][1], zoom) : [[translateExtent[0][0], translateExtent[0][1]], [translateExtent[1][0], translateExtent[1][1]]];
+         };
 
+         zoom.constrain = function (_) {
+           return arguments.length ? (constrain = _, zoom) : constrain;
+         };
 
-               items = list.selectAll('li')
-                   .data(field.keys);
+         zoom.interpolate = function (_) {
+           return arguments.length ? (interpolate = _, zoom) : interpolate;
+         };
 
-               // Enter
-               var enter = items.enter()
-                   .append('li')
-                   .attr('class', function(d) { return 'labeled-input preset-access-' + d; });
+         zoom._transform = function (_) {
+           return arguments.length ? (_transform = _, zoom) : _transform;
+         };
 
-               enter
-                   .append('span')
-                   .attr('class', 'label preset-label-access')
-                   .attr('for', function(d) { return 'preset-input-access-' + d; })
-                   .text(function(d) { return field.t('types.' + d); });
+         return utilRebind(zoom, dispatch$1, 'on');
+       }
 
-               enter
-                   .append('div')
-                   .attr('class', 'preset-input-access-wrap')
-                   .append('input')
-                   .attr('type', 'text')
-                   .attr('class', function(d) { return 'preset-input-access preset-input-access-' + d; })
-                   .call(utilNoAuto)
-                   .each(function(d) {
-                       select(this)
-                           .call(uiCombobox(context, 'access-' + d)
-                               .data(access.options(d))
-                           );
-                   });
+       // if pointer events are supported. Falls back to default `dblclick` event.
 
+       function utilDoubleUp() {
+         var dispatch$1 = dispatch('doubleUp');
+         var _maxTimespan = 500; // milliseconds
 
-               // Update
-               items = items.merge(enter);
+         var _maxDistance = 20; // web pixels; be somewhat generous to account for touch devices
 
-               wrap.selectAll('.preset-input-access')
-                   .on('change', change)
-                   .on('blur', change);
-           }
+         var _pointer; // object representing the pointer that could trigger double up
 
 
-           function change(d) {
-               var tag = {};
-               var value = context.cleanTagValue(utilGetSetValue(select(this)));
+         function pointerIsValidFor(loc) {
+           // second pointerup must occur within a small timeframe after the first pointerdown
+           return new Date().getTime() - _pointer.startTime <= _maxTimespan && // all pointer events must occur within a small distance of the first pointerdown
+           geoVecLength(_pointer.startLoc, loc) <= _maxDistance;
+         }
 
-               // don't override multiple values with blank string
-               if (!value && typeof _tags[d] !== 'string') return;
+         function pointerdown(d3_event) {
+           // ignore right-click
+           if (d3_event.ctrlKey || d3_event.button === 2) return;
+           var loc = [d3_event.clientX, d3_event.clientY]; // Don't rely on pointerId here since it can change between pointerdown
+           // events on touch devices
 
-               tag[d] = value || undefined;
-               dispatch$1.call('change', this, tag);
+           if (_pointer && !pointerIsValidFor(loc)) {
+             // if this pointer is no longer valid, clear it so another can be started
+             _pointer = undefined;
            }
 
+           if (!_pointer) {
+             _pointer = {
+               startLoc: loc,
+               startTime: new Date().getTime(),
+               upCount: 0,
+               pointerId: d3_event.pointerId
+             };
+           } else {
+             // double down
+             _pointer.pointerId = d3_event.pointerId;
+           }
+         }
 
-           access.options = function(type) {
-               var options = ['no', 'permissive', 'private', 'permit', 'destination'];
-
-               if (type !== 'access') {
-                   options.unshift('yes');
-                   options.push('designated');
-
-                   if (type === 'bicycle') {
-                       options.push('dismount');
-                   }
-               }
-
-               return options.map(function(option) {
-                   return {
-                       title: field.t('options.' + option + '.description'),
-                       value: option
-                   };
-               });
-           };
+         function pointerup(d3_event) {
+           // ignore right-click
+           if (d3_event.ctrlKey || d3_event.button === 2) return;
+           if (!_pointer || _pointer.pointerId !== d3_event.pointerId) return;
+           _pointer.upCount += 1;
 
+           if (_pointer.upCount === 2) {
+             // double up!
+             var loc = [d3_event.clientX, d3_event.clientY];
 
-           var placeholdersByHighway = {
-               footway: {
-                   foot: 'designated',
-                   motor_vehicle: 'no'
-               },
-               steps: {
-                   foot: 'yes',
-                   motor_vehicle: 'no',
-                   bicycle: 'no',
-                   horse: 'no'
-               },
-               pedestrian: {
-                   foot: 'yes',
-                   motor_vehicle: 'no'
-               },
-               cycleway: {
-                   motor_vehicle: 'no',
-                   bicycle: 'designated'
-               },
-               bridleway: {
-                   motor_vehicle: 'no',
-                   horse: 'designated'
-               },
-               path: {
-                   foot: 'yes',
-                   motor_vehicle: 'no',
-                   bicycle: 'yes',
-                   horse: 'yes'
-               },
-               motorway: {
-                   foot: 'no',
-                   motor_vehicle: 'yes',
-                   bicycle: 'no',
-                   horse: 'no'
-               },
-               trunk: {
-                   motor_vehicle: 'yes'
-               },
-               primary: {
-                   foot: 'yes',
-                   motor_vehicle: 'yes',
-                   bicycle: 'yes',
-                   horse: 'yes'
-               },
-               secondary: {
-                   foot: 'yes',
-                   motor_vehicle: 'yes',
-                   bicycle: 'yes',
-                   horse: 'yes'
-               },
-               tertiary: {
-                   foot: 'yes',
-                   motor_vehicle: 'yes',
-                   bicycle: 'yes',
-                   horse: 'yes'
-               },
-               residential: {
-                   foot: 'yes',
-                   motor_vehicle: 'yes',
-                   bicycle: 'yes',
-                   horse: 'yes'
-               },
-               unclassified: {
-                   foot: 'yes',
-                   motor_vehicle: 'yes',
-                   bicycle: 'yes',
-                   horse: 'yes'
-               },
-               service: {
-                   foot: 'yes',
-                   motor_vehicle: 'yes',
-                   bicycle: 'yes',
-                   horse: 'yes'
-               },
-               motorway_link: {
-                   foot: 'no',
-                   motor_vehicle: 'yes',
-                   bicycle: 'no',
-                   horse: 'no'
-               },
-               trunk_link: {
-                   motor_vehicle: 'yes'
-               },
-               primary_link: {
-                   foot: 'yes',
-                   motor_vehicle: 'yes',
-                   bicycle: 'yes',
-                   horse: 'yes'
-               },
-               secondary_link: {
-                   foot: 'yes',
-                   motor_vehicle: 'yes',
-                   bicycle: 'yes',
-                   horse: 'yes'
-               },
-               tertiary_link: {
-                   foot: 'yes',
-                   motor_vehicle: 'yes',
-                   bicycle: 'yes',
-                   horse: 'yes'
-               }
-           };
+             if (pointerIsValidFor(loc)) {
+               var locInThis = utilFastMouse(this)(d3_event);
+               dispatch$1.call('doubleUp', this, d3_event, locInThis);
+             } // clear the pointer info in any case
 
 
-           access.tags = function(tags) {
-               _tags = tags;
-
-               utilGetSetValue(items.selectAll('.preset-input-access'), function(d) {
-                       return typeof tags[d] === 'string' ? tags[d] : '';
-                   })
-                   .classed('mixed', function(d) {
-                       return tags[d] && Array.isArray(tags[d]);
-                   })
-                   .attr('title', function(d) {
-                       return tags[d] && Array.isArray(tags[d]) && tags[d].filter(Boolean).join('\n');
-                   })
-                   .attr('placeholder', function(d) {
-                       if (tags[d] && Array.isArray(tags[d])) {
-                           return _t('inspector.multiple_values');
-                       }
-                       if (d === 'access') {
-                           return 'yes';
-                       }
-                       if (tags.access && typeof tags.access === 'string') {
-                           return tags.access;
-                       }
-                       if (tags.highway) {
-                           if (typeof tags.highway === 'string') {
-                               if (placeholdersByHighway[tags.highway] &&
-                                   placeholdersByHighway[tags.highway][d]) {
+             _pointer = undefined;
+           }
+         }
 
-                                   return placeholdersByHighway[tags.highway][d];
-                               }
-                           } else {
-                               var impliedAccesses = tags.highway.filter(Boolean).map(function(highwayVal) {
-                                   return placeholdersByHighway[highwayVal] && placeholdersByHighway[highwayVal][d];
-                               }).filter(Boolean);
-
-                               if (impliedAccesses.length === tags.highway.length &&
-                                   new Set(impliedAccesses).size === 1) {
-                                   // if all the highway values have the same implied access for this type then use that
-                                   return impliedAccesses[0];
-                               }
-                           }
-                       }
-                       return field.placeholder();
-                   });
-           };
+         function doubleUp(selection) {
+           if ('PointerEvent' in window) {
+             // dblclick isn't well supported on touch devices so manually use
+             // pointer events if they're available
+             selection.on('pointerdown.doubleUp', pointerdown).on('pointerup.doubleUp', pointerup);
+           } else {
+             // fallback to dblclick
+             selection.on('dblclick.doubleUp', function (d3_event) {
+               dispatch$1.call('doubleUp', this, d3_event, utilFastMouse(this)(d3_event));
+             });
+           }
+         }
 
+         doubleUp.off = function (selection) {
+           selection.on('pointerdown.doubleUp', null).on('pointerup.doubleUp', null).on('dblclick.doubleUp', null);
+         };
 
-           access.focus = function() {
-               items.selectAll('.preset-input-access')
-                   .node().focus();
-           };
+         return utilRebind(doubleUp, dispatch$1, 'on');
+       }
 
+       var TILESIZE = 256;
+       var minZoom = 2;
+       var maxZoom = 24;
+       var kMin = geoZoomToScale(minZoom, TILESIZE);
+       var kMax = geoZoomToScale(maxZoom, TILESIZE);
 
-           return utilRebind(access, dispatch$1, 'on');
+       function clamp(num, min, max) {
+         return Math.max(min, Math.min(num, max));
        }
 
-       function uiFieldAddress(field, context) {
-           var dispatch$1 = dispatch('change');
-           var _selection = select(null);
-           var _wrap = select(null);
-           var addrField = _mainPresetIndex.field('address');   // needed for placeholder strings
-
-           var _entityIDs = [];
-           var _tags;
-           var _countryCode;
-           var _addressFormats = [{
-               format: [
-                   ['housenumber', 'street'],
-                   ['city', 'postcode']
-               ]
-             }];
+       function rendererMap(context) {
+         var dispatch$1 = dispatch('move', 'drawn', 'crossEditableZoom', 'hitMinZoom', 'changeHighlighting', 'changeAreaFill');
+         var projection = context.projection;
+         var curtainProjection = context.curtainProjection;
+         var drawLayers;
+         var drawPoints;
+         var drawVertices;
+         var drawLines;
+         var drawAreas;
+         var drawMidpoints;
+         var drawLabels;
 
-           _mainFileFetcher.get('address_formats')
-               .then(function(d) {
-                   _addressFormats = d;
-                   if (!_selection.empty()) {
-                       _selection.call(address);
-                   }
-               })
-               .catch(function() { /* ignore */ });
-
-
-           function getNearStreets() {
-               var extent = combinedEntityExtent();
-               var l = extent.center();
-               var box = geoExtent(l).padByMeters(200);
-
-               var streets = context.history().intersects(box)
-                   .filter(isAddressable)
-                   .map(function(d) {
-                       var loc = context.projection([
-                           (extent[0][0] + extent[1][0]) / 2,
-                           (extent[0][1] + extent[1][1]) / 2
-                       ]);
-                       var choice = geoChooseEdge(context.graph().childNodes(d), loc, context.projection);
-
-                       return {
-                           title: d.tags.name,
-                           value: d.tags.name,
-                           dist: choice.distance
-                       };
-                   })
-                   .sort(function(a, b) {
-                       return a.dist - b.dist;
-                   });
+         var _selection = select(null);
 
-               return utilArrayUniqBy(streets, 'value');
+         var supersurface = select(null);
+         var wrapper = select(null);
+         var surface = select(null);
+         var _dimensions = [1, 1];
+         var _dblClickZoomEnabled = true;
+         var _redrawEnabled = true;
 
-               function isAddressable(d) {
-                   return d.tags.highway && d.tags.name && d.type === 'way';
-               }
-           }
+         var _gestureTransformStart;
 
+         var _transformStart = projection.transform();
 
-           function getNearCities() {
-               var extent = combinedEntityExtent();
-               var l = extent.center();
-               var box = geoExtent(l).padByMeters(200);
+         var _transformLast;
 
-               var cities = context.history().intersects(box)
-                   .filter(isAddressable)
-                   .map(function(d) {
-                       return {
-                           title: d.tags['addr:city'] || d.tags.name,
-                           value: d.tags['addr:city'] || d.tags.name,
-                           dist: geoSphericalDistance(d.extent(context.graph()).center(), l)
-                       };
-                   })
-                   .sort(function(a, b) {
-                       return a.dist - b.dist;
-                   });
+         var _isTransformed = false;
+         var _minzoom = 0;
 
-               return utilArrayUniqBy(cities, 'value');
+         var _getMouseCoords;
 
+         var _lastPointerEvent;
 
-               function isAddressable(d) {
-                   if (d.tags.name) {
-                       if (d.tags.admin_level === '8' && d.tags.boundary === 'administrative')
-                           return true;
-                       if (d.tags.border_type === 'city')
-                           return true;
-                       if (d.tags.place === 'city' || d.tags.place === 'town' || d.tags.place === 'village')
-                           return true;
-                   }
+         var _lastWithinEditableZoom; // whether a pointerdown event started the zoom
 
-                   if (d.tags['addr:city'])
-                       return true;
 
-                   return false;
-               }
-           }
+         var _pointerDown = false; // use pointer events on supported platforms; fallback to mouse events
 
-           function getNearValues(key) {
-               var extent = combinedEntityExtent();
-               var l = extent.center();
-               var box = geoExtent(l).padByMeters(200);
+         var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse'; // use pointer event interaction if supported; fallback to touch/mouse events in d3-zoom
 
-               var results = context.history().intersects(box)
-                   .filter(function hasTag(d) { return _entityIDs.indexOf(d.id) === -1 && d.tags[key]; })
-                   .map(function(d) {
-                       return {
-                           title: d.tags[key],
-                           value: d.tags[key],
-                           dist: geoSphericalDistance(d.extent(context.graph()).center(), l)
-                       };
-                   })
-                   .sort(function(a, b) {
-                       return a.dist - b.dist;
-                   });
 
-               return utilArrayUniqBy(results, 'value');
-           }
+         var _zoomerPannerFunction = 'PointerEvent' in window ? utilZoomPan : d3_zoom;
 
+         var _zoomerPanner = _zoomerPannerFunction().scaleExtent([kMin, kMax]).interpolate(interpolate).filter(zoomEventFilter).on('zoom.map', zoomPan).on('start.map', function (d3_event) {
+           _pointerDown = d3_event && (d3_event.type === 'pointerdown' || d3_event.sourceEvent && d3_event.sourceEvent.type === 'pointerdown');
+         }).on('end.map', function () {
+           _pointerDown = false;
+         });
 
-           function updateForCountryCode() {
+         var _doubleUpHandler = utilDoubleUp();
+
+         var scheduleRedraw = throttle(redraw, 750); // var isRedrawScheduled = false;
+         // var pendingRedrawCall;
+         // function scheduleRedraw() {
+         //     // Only schedule the redraw if one has not already been set.
+         //     if (isRedrawScheduled) return;
+         //     isRedrawScheduled = true;
+         //     var that = this;
+         //     var args = arguments;
+         //     pendingRedrawCall = window.requestIdleCallback(function () {
+         //         // Reset the boolean so future redraws can be set.
+         //         isRedrawScheduled = false;
+         //         redraw.apply(that, args);
+         //     }, { timeout: 1400 });
+         // }
 
-               if (!_countryCode) return;
 
-               var addressFormat;
-               for (var i = 0; i < _addressFormats.length; i++) {
-                   var format = _addressFormats[i];
-                   if (!format.countryCodes) {
-                       addressFormat = format;   // choose the default format, keep going
-                   } else if (format.countryCodes.indexOf(_countryCode) !== -1) {
-                       addressFormat = format;   // choose the country format, stop here
-                       break;
-                   }
-               }
+         function cancelPendingRedraw() {
+           scheduleRedraw.cancel(); // isRedrawScheduled = false;
+           // window.cancelIdleCallback(pendingRedrawCall);
+         }
 
-               var dropdowns = addressFormat.dropdowns || [
-                   'city', 'county', 'country', 'district', 'hamlet',
-                   'neighbourhood', 'place', 'postcode', 'province',
-                   'quarter', 'state', 'street', 'subdistrict', 'suburb'
-               ];
+         function map(selection) {
+           _selection = selection;
+           context.on('change.map', immediateRedraw);
+           var osm = context.connection();
 
-               var widths = addressFormat.widths || {
-                   housenumber: 1/3, street: 2/3,
-                   city: 2/3, state: 1/4, postcode: 1/3
-               };
+           if (osm) {
+             osm.on('change.map', immediateRedraw);
+           }
 
-               function row(r) {
-                   // Normalize widths.
-                   var total = r.reduce(function(sum, key) {
-                       return sum + (widths[key] || 0.5);
-                   }, 0);
+           function didUndoOrRedo(targetTransform) {
+             var mode = context.mode().id;
+             if (mode !== 'browse' && mode !== 'select') return;
 
-                   return r.map(function(key) {
-                       return {
-                           id: key,
-                           width: (widths[key] || 0.5) / total
-                       };
-                   });
-               }
+             if (targetTransform) {
+               map.transformEase(targetTransform);
+             }
+           }
 
-               var rows = _wrap.selectAll('.addr-row')
-                   .data(addressFormat.format, function(d) {
-                       return d.toString();
-                   });
+           context.history().on('merge.map', function () {
+             scheduleRedraw();
+           }).on('change.map', immediateRedraw).on('undone.map', function (stack, fromStack) {
+             didUndoOrRedo(fromStack.transform);
+           }).on('redone.map', function (stack) {
+             didUndoOrRedo(stack.transform);
+           });
+           context.background().on('change.map', immediateRedraw);
+           context.features().on('redraw.map', immediateRedraw);
+           drawLayers.on('change.map', function () {
+             context.background().updateImagery();
+             immediateRedraw();
+           });
+           selection.on('wheel.map mousewheel.map', function (d3_event) {
+             // disable swipe-to-navigate browser pages on trackpad/magic mouse – #5552
+             d3_event.preventDefault();
+           }).call(_zoomerPanner).call(_zoomerPanner.transform, projection.transform()).on('dblclick.zoom', null); // override d3-zoom dblclick handling
+
+           map.supersurface = supersurface = selection.append('div').attr('class', 'supersurface').call(utilSetTransform, 0, 0); // Need a wrapper div because Opera can't cope with an absolutely positioned
+           // SVG element: http://bl.ocks.org/jfirebaugh/6fbfbd922552bf776c16
+
+           wrapper = supersurface.append('div').attr('class', 'layer layer-data');
+           map.surface = surface = wrapper.call(drawLayers).selectAll('.surface');
+           surface.call(drawLabels.observe).call(_doubleUpHandler).on(_pointerPrefix + 'down.zoom', function (d3_event) {
+             _lastPointerEvent = d3_event;
+
+             if (d3_event.button === 2) {
+               d3_event.stopPropagation();
+             }
+           }, true).on(_pointerPrefix + 'up.zoom', function (d3_event) {
+             _lastPointerEvent = d3_event;
+
+             if (resetTransform()) {
+               immediateRedraw();
+             }
+           }).on(_pointerPrefix + 'move.map', function (d3_event) {
+             _lastPointerEvent = d3_event;
+           }).on(_pointerPrefix + 'over.vertices', function (d3_event) {
+             if (map.editableDataEnabled() && !_isTransformed) {
+               var hover = d3_event.target.__data__;
+               surface.call(drawVertices.drawHover, context.graph(), hover, map.extent());
+               dispatch$1.call('drawn', this, {
+                 full: false
+               });
+             }
+           }).on(_pointerPrefix + 'out.vertices', function (d3_event) {
+             if (map.editableDataEnabled() && !_isTransformed) {
+               var hover = d3_event.relatedTarget && d3_event.relatedTarget.__data__;
+               surface.call(drawVertices.drawHover, context.graph(), hover, map.extent());
+               dispatch$1.call('drawn', this, {
+                 full: false
+               });
+             }
+           });
+           var detected = utilDetect(); // only WebKit supports gesture events
+
+           if ('GestureEvent' in window && // Listening for gesture events on iOS 13.4+ breaks double-tapping,
+           // but we only need to do this on desktop Safari anyway. – #7694
+           !detected.isMobileWebKit) {
+             // Desktop Safari sends gesture events for multitouch trackpad pinches.
+             // We can listen for these and translate them into map zooms.
+             surface.on('gesturestart.surface', function (d3_event) {
+               d3_event.preventDefault();
+               _gestureTransformStart = projection.transform();
+             }).on('gesturechange.surface', gestureChange);
+           } // must call after surface init
+
+
+           updateAreaFill();
+
+           _doubleUpHandler.on('doubleUp.map', function (d3_event, p0) {
+             if (!_dblClickZoomEnabled) return; // don't zoom if targeting something other than the map itself
+
+             if (_typeof(d3_event.target.__data__) === 'object' && // or area fills
+             !select(d3_event.target).classed('fill')) return;
+             var zoomOut = d3_event.shiftKey;
+             var t = projection.transform();
+             var p1 = t.invert(p0);
+             t = t.scale(zoomOut ? 0.5 : 2);
+             t.x = p0[0] - p1[0] * t.k;
+             t.y = p0[1] - p1[1] * t.k;
+             map.transformEase(t);
+           });
 
-               rows.exit()
-                   .remove();
+           context.on('enter.map', function () {
+             if (!map.editableDataEnabled(true
+             /* skip zoom check */
+             )) return; // redraw immediately any objects affected by a change in selectedIDs.
 
-               rows
-                   .enter()
-                   .append('div')
-                   .attr('class', 'addr-row')
-                   .selectAll('input')
-                   .data(row)
-                   .enter()
-                   .append('input')
-                   .property('type', 'text')
-                   .call(updatePlaceholder)
-                   .attr('class', function (d) { return 'addr-' + d.id; })
-                   .call(utilNoAuto)
-                   .each(addDropdown)
-                   .style('width', function (d) { return d.width * 100 + '%'; });
-
-
-               function addDropdown(d) {
-                   if (dropdowns.indexOf(d.id) === -1) return;  // not a dropdown
-
-                   var nearValues = (d.id === 'street') ? getNearStreets
-                       : (d.id === 'city') ? getNearCities
-                       : getNearValues;
-
-                   select(this)
-                       .call(uiCombobox(context, 'address-' + d.id)
-                           .minItems(1)
-                           .caseSensitive(true)
-                           .fetcher(function(value, callback) {
-                               callback(nearValues('addr:' + d.id));
-                           })
-                       );
+             var graph = context.graph();
+             var selectedAndParents = {};
+             context.selectedIDs().forEach(function (id) {
+               var entity = graph.hasEntity(id);
+
+               if (entity) {
+                 selectedAndParents[entity.id] = entity;
+
+                 if (entity.type === 'node') {
+                   graph.parentWays(entity).forEach(function (parent) {
+                     selectedAndParents[parent.id] = parent;
+                   });
+                 }
                }
+             });
+             var data = Object.values(selectedAndParents);
 
-               _wrap.selectAll('input')
-                   .on('blur', change())
-                   .on('change', change());
+             var filter = function filter(d) {
+               return d.id in selectedAndParents;
+             };
 
-               _wrap.selectAll('input:not(.combobox-input)')
-                   .on('input', change(true));
+             data = context.features().filter(data, graph);
+             surface.call(drawVertices.drawSelected, graph, map.extent()).call(drawLines, graph, data, filter).call(drawAreas, graph, data, filter).call(drawMidpoints, graph, data, filter, map.trimmedExtent());
+             dispatch$1.call('drawn', this, {
+               full: false
+             }); // redraw everything else later
 
-               if (_tags) updateTags(_tags);
-           }
+             scheduleRedraw();
+           });
+           map.dimensions(utilGetDimensions(selection));
+         }
 
+         function zoomEventFilter(d3_event) {
+           // Fix for #2151, (see also d3/d3-zoom#60, d3/d3-brush#18)
+           // Intercept `mousedown` and check if there is an orphaned zoom gesture.
+           // This can happen if a previous `mousedown` occurred without a `mouseup`.
+           // If we detect this, dispatch `mouseup` to complete the orphaned gesture,
+           // so that d3-zoom won't stop propagation of new `mousedown` events.
+           if (d3_event.type === 'mousedown') {
+             var hasOrphan = false;
+             var listeners = window.__on;
 
-           function address(selection) {
-               _selection = selection;
+             for (var i = 0; i < listeners.length; i++) {
+               var listener = listeners[i];
 
-               _wrap = selection.selectAll('.form-field-input-wrap')
-                   .data([0]);
+               if (listener.name === 'zoom' && listener.type === 'mouseup') {
+                 hasOrphan = true;
+                 break;
+               }
+             }
 
-               _wrap = _wrap.enter()
-                   .append('div')
-                   .attr('class', 'form-field-input-wrap form-field-input-' + field.type)
-                   .merge(_wrap);
+             if (hasOrphan) {
+               var event = window.CustomEvent;
 
-               var extent = combinedEntityExtent();
+               if (event) {
+                 event = new event('mouseup');
+               } else {
+                 event = window.document.createEvent('Event');
+                 event.initEvent('mouseup', false, false);
+               } // Event needs to be dispatched with an event.view property.
 
-               if (extent) {
-                   var countryCode;
-                   if (context.inIntro()) {
-                       // localize the address format for the walkthrough
-                       countryCode = _t('intro.graph.countrycode');
-                   } else {
-                       var center = extent.center();
-                       countryCode = iso1A2Code(center);
-                   }
-                   if (countryCode) {
-                       _countryCode = countryCode.toLowerCase();
-                       updateForCountryCode();
-                   }
-               }
+
+               event.view = window;
+               window.dispatchEvent(event);
+             }
            }
 
+           return d3_event.button !== 2; // ignore right clicks
+         }
 
-           function change(onInput) {
-               return function() {
-                   var tags = {};
+         function pxCenter() {
+           return [_dimensions[0] / 2, _dimensions[1] / 2];
+         }
+
+         function drawEditable(difference, extent) {
+           var mode = context.mode();
+           var graph = context.graph();
+           var features = context.features();
+           var all = context.history().intersects(map.extent());
+           var fullRedraw = false;
+           var data;
+           var set;
+           var filter;
+           var applyFeatureLayerFilters = true;
+
+           if (map.isInWideSelection()) {
+             data = [];
+             utilEntityAndDeepMemberIDs(mode.selectedIDs(), context.graph()).forEach(function (id) {
+               var entity = context.hasEntity(id);
+               if (entity) data.push(entity);
+             });
+             fullRedraw = true;
+             filter = utilFunctor(true); // selected features should always be visible, so we can skip filtering
 
-                   _wrap.selectAll('input')
-                       .each(function (subfield) {
-                           var key = field.key + ':' + subfield.id;
+             applyFeatureLayerFilters = false;
+           } else if (difference) {
+             var complete = difference.complete(map.extent());
+             data = Object.values(complete).filter(Boolean);
+             set = new Set(Object.keys(complete));
 
-                           var value = this.value;
-                           if (!onInput) value = context.cleanTagValue(value);
+             filter = function filter(d) {
+               return set.has(d.id);
+             };
 
-                           // don't override multiple values with blank string
-                           if (Array.isArray(_tags[key]) && !value) return;
+             features.clear(data);
+           } else {
+             // force a full redraw if gatherStats detects that a feature
+             // should be auto-hidden (e.g. points or buildings)..
+             if (features.gatherStats(all, graph, _dimensions)) {
+               extent = undefined;
+             }
 
-                           tags[key] = value || undefined;
-                       });
+             if (extent) {
+               data = context.history().intersects(map.extent().intersection(extent));
+               set = new Set(data.map(function (entity) {
+                 return entity.id;
+               }));
 
-                   dispatch$1.call('change', this, tags, onInput);
+               filter = function filter(d) {
+                 return set.has(d.id);
                };
+             } else {
+               data = all;
+               fullRedraw = true;
+               filter = utilFunctor(true);
+             }
            }
 
-           function updatePlaceholder(inputSelection) {
-               return inputSelection.attr('placeholder', function(subfield) {
-                   if (_tags && Array.isArray(_tags[field.key + ':' + subfield.id])) {
-                       return _t('inspector.multiple_values');
-                   }
-                   if (_countryCode) {
-                       var localkey = subfield.id + '!' + _countryCode;
-                       var tkey = addrField.strings.placeholders[localkey] ? localkey : subfield.id;
-                       return addrField.t('placeholders.' + tkey);
-                   }
-               });
+           if (applyFeatureLayerFilters) {
+             data = features.filter(data, graph);
+           } else {
+             context.features().resetStats();
            }
 
-
-           function updateTags(tags) {
-               utilGetSetValue(_wrap.selectAll('input'), function (subfield) {
-                       var val = tags[field.key + ':' + subfield.id];
-                       return typeof val === 'string' ? val : '';
-                   })
-                   .attr('title', function(subfield) {
-                       var val = tags[field.key + ':' + subfield.id];
-                       return val && Array.isArray(val) && val.filter(Boolean).join('\n');
-                   })
-                   .classed('mixed', function(subfield) {
-                       return Array.isArray(tags[field.key + ':' + subfield.id]);
-                   })
-                   .call(updatePlaceholder);
+           if (mode && mode.id === 'select') {
+             // update selected vertices - the user might have just double-clicked a way,
+             // creating a new vertex, triggering a partial redraw without a mode change
+             surface.call(drawVertices.drawSelected, graph, map.extent());
            }
 
+           surface.call(drawVertices, graph, data, filter, map.extent(), fullRedraw).call(drawLines, graph, data, filter).call(drawAreas, graph, data, filter).call(drawMidpoints, graph, data, filter, map.trimmedExtent()).call(drawLabels, graph, data, filter, _dimensions, fullRedraw).call(drawPoints, graph, data, filter);
+           dispatch$1.call('drawn', this, {
+             full: true
+           });
+         }
+
+         map.init = function () {
+           drawLayers = svgLayers(projection, context);
+           drawPoints = svgPoints(projection, context);
+           drawVertices = svgVertices(projection, context);
+           drawLines = svgLines(projection, context);
+           drawAreas = svgAreas(projection, context);
+           drawMidpoints = svgMidpoints(projection, context);
+           drawLabels = svgLabels(projection, context);
+         };
 
-           function combinedEntityExtent() {
-               return _entityIDs && _entityIDs.length && utilTotalExtent(_entityIDs, context.graph());
+         function editOff() {
+           context.features().resetStats();
+           surface.selectAll('.layer-osm *').remove();
+           surface.selectAll('.layer-touch:not(.markers) *').remove();
+           var allowed = {
+             'browse': true,
+             'save': true,
+             'select-note': true,
+             'select-data': true,
+             'select-error': true
+           };
+           var mode = context.mode();
+
+           if (mode && !allowed[mode.id]) {
+             context.enter(modeBrowse(context));
            }
 
+           dispatch$1.call('drawn', this, {
+             full: true
+           });
+         }
 
-           address.entityIDs = function(val) {
-               if (!arguments.length) return _entityIDs;
-               _entityIDs = val;
-               return address;
-           };
+         function gestureChange(d3_event) {
+           // Remap Safari gesture events to wheel events - #5492
+           // We want these disabled most places, but enabled for zoom/unzoom on map surface
+           // https://developer.mozilla.org/en-US/docs/Web/API/GestureEvent
+           var e = d3_event;
+           e.preventDefault();
+           var props = {
+             deltaMode: 0,
+             // dummy values to ignore in zoomPan
+             deltaY: 1,
+             // dummy values to ignore in zoomPan
+             clientX: e.clientX,
+             clientY: e.clientY,
+             screenX: e.screenX,
+             screenY: e.screenY,
+             x: e.x,
+             y: e.y
+           };
+           var e2 = new WheelEvent('wheel', props);
+           e2._scale = e.scale; // preserve the original scale
+
+           e2._rotation = e.rotation; // preserve the original rotation
+
+           _selection.node().dispatchEvent(e2);
+         }
+
+         function zoomPan(event, key, transform) {
+           var source = event && event.sourceEvent || event;
+           var eventTransform = transform || event && event.transform;
+           var x = eventTransform.x;
+           var y = eventTransform.y;
+           var k = eventTransform.k; // Special handling of 'wheel' events:
+           // They might be triggered by the user scrolling the mouse wheel,
+           // or 2-finger pinch/zoom gestures, the transform may need adjustment.
+
+           if (source && source.type === 'wheel') {
+             // assume that the gesture is already handled by pointer events
+             if (_pointerDown) return;
+             var detected = utilDetect();
+             var dX = source.deltaX;
+             var dY = source.deltaY;
+             var x2 = x;
+             var y2 = y;
+             var k2 = k;
+             var t0, p0, p1; // Normalize mousewheel scroll speed (Firefox) - #3029
+             // If wheel delta is provided in LINE units, recalculate it in PIXEL units
+             // We are essentially redoing the calculations that occur here:
+             //   https://github.com/d3/d3-zoom/blob/78563a8348aa4133b07cac92e2595c2227ca7cd7/src/zoom.js#L203
+             // See this for more info:
+             //   https://github.com/basilfx/normalize-wheel/blob/master/src/normalizeWheel.js
+
+             if (source.deltaMode === 1
+             /* LINE */
+             ) {
+                 // Convert from lines to pixels, more if the user is scrolling fast.
+                 // (I made up the exp function to roughly match Firefox to what Chrome does)
+                 // These numbers should be floats, because integers are treated as pan gesture below.
+                 var lines = Math.abs(source.deltaY);
+                 var sign = source.deltaY > 0 ? 1 : -1;
+                 dY = sign * clamp(Math.exp((lines - 1) * 0.75) * 4.000244140625, 4.000244140625, // min
+                 350.000244140625 // max
+                 ); // On Firefox Windows and Linux we always get +/- the scroll line amount (default 3)
+                 // There doesn't seem to be any scroll acceleration.
+                 // This multiplier increases the speed a little bit - #5512
+
+                 if (detected.os !== 'mac') {
+                   dY *= 5;
+                 } // recalculate x2,y2,k2
+
+
+                 t0 = _isTransformed ? _transformLast : _transformStart;
+                 p0 = _getMouseCoords(source);
+                 p1 = t0.invert(p0);
+                 k2 = t0.k * Math.pow(2, -dY / 500);
+                 k2 = clamp(k2, kMin, kMax);
+                 x2 = p0[0] - p1[0] * k2;
+                 y2 = p0[1] - p1[1] * k2; // 2 finger map pinch zooming (Safari) - #5492
+                 // These are fake `wheel` events we made from Safari `gesturechange` events..
+               } else if (source._scale) {
+               // recalculate x2,y2,k2
+               t0 = _gestureTransformStart;
+               p0 = _getMouseCoords(source);
+               p1 = t0.invert(p0);
+               k2 = t0.k * source._scale;
+               k2 = clamp(k2, kMin, kMax);
+               x2 = p0[0] - p1[0] * k2;
+               y2 = p0[1] - p1[1] * k2; // 2 finger map pinch zooming (all browsers except Safari) - #5492
+               // Pinch zooming via the `wheel` event will always have:
+               // - `ctrlKey = true`
+               // - `deltaY` is not round integer pixels (ignore `deltaX`)
+             } else if (source.ctrlKey && !isInteger(dY)) {
+               dY *= 6; // slightly scale up whatever the browser gave us
+               // recalculate x2,y2,k2
+
+               t0 = _isTransformed ? _transformLast : _transformStart;
+               p0 = _getMouseCoords(source);
+               p1 = t0.invert(p0);
+               k2 = t0.k * Math.pow(2, -dY / 500);
+               k2 = clamp(k2, kMin, kMax);
+               x2 = p0[0] - p1[0] * k2;
+               y2 = p0[1] - p1[1] * k2; // Trackpad scroll zooming with shift or alt/option key down
+             } else if ((source.altKey || source.shiftKey) && isInteger(dY)) {
+               // recalculate x2,y2,k2
+               t0 = _isTransformed ? _transformLast : _transformStart;
+               p0 = _getMouseCoords(source);
+               p1 = t0.invert(p0);
+               k2 = t0.k * Math.pow(2, -dY / 500);
+               k2 = clamp(k2, kMin, kMax);
+               x2 = p0[0] - p1[0] * k2;
+               y2 = p0[1] - p1[1] * k2; // 2 finger map panning (Mac only, all browsers) - #5492, #5512
+               // Panning via the `wheel` event will always have:
+               // - `ctrlKey = false`
+               // - `deltaX`,`deltaY` are round integer pixels
+             } else if (detected.os === 'mac' && !source.ctrlKey && isInteger(dX) && isInteger(dY)) {
+               p1 = projection.translate();
+               x2 = p1[0] - dX;
+               y2 = p1[1] - dY;
+               k2 = projection.scale();
+               k2 = clamp(k2, kMin, kMax);
+             } // something changed - replace the event transform
+
+
+             if (x2 !== x || y2 !== y || k2 !== k) {
+               x = x2;
+               y = y2;
+               k = k2;
+               eventTransform = identity$2.translate(x2, y2).scale(k2);
+
+               if (_zoomerPanner._transform) {
+                 // utilZoomPan interface
+                 _zoomerPanner._transform(eventTransform);
+               } else {
+                 // d3_zoom interface
+                 _selection.node().__zoom = eventTransform;
+               }
+             }
+           }
 
+           if (_transformStart.x === x && _transformStart.y === y && _transformStart.k === k) {
+             return; // no change
+           }
 
-           address.tags = function(tags) {
-               _tags = tags;
-               updateTags(tags);
-           };
+           var withinEditableZoom = map.withinEditableZoom();
 
+           if (_lastWithinEditableZoom !== withinEditableZoom) {
+             if (_lastWithinEditableZoom !== undefined) {
+               // notify that the map zoomed in or out over the editable zoom threshold
+               dispatch$1.call('crossEditableZoom', this, withinEditableZoom);
+             }
 
-           address.focus = function() {
-               var node = _wrap.selectAll('input').node();
-               if (node) node.focus();
-           };
+             _lastWithinEditableZoom = withinEditableZoom;
+           }
 
+           if (geoScaleToZoom(k, TILESIZE) < _minzoom) {
+             surface.interrupt();
+             dispatch$1.call('hitMinZoom', this, map);
+             setCenterZoom(map.center(), context.minEditableZoom(), 0, true);
+             scheduleRedraw();
+             dispatch$1.call('move', this, map);
+             return;
+           }
 
-           return utilRebind(address, dispatch$1, 'on');
-       }
+           projection.transform(eventTransform);
+           var scale = k / _transformStart.k;
+           var tX = (x / scale - _transformStart.x) * scale;
+           var tY = (y / scale - _transformStart.y) * scale;
 
-       function uiFieldCycleway(field, context) {
-           var dispatch$1 = dispatch('change');
-           var items = select(null);
-           var wrap = select(null);
-           var _tags;
+           if (context.inIntro()) {
+             curtainProjection.transform({
+               x: x - tX,
+               y: y - tY,
+               k: k
+             });
+           }
 
-           function cycleway(selection) {
+           if (source) {
+             _lastPointerEvent = event;
+           }
 
-               function stripcolon(s) {
-                   return s.replace(':', '');
-               }
+           _isTransformed = true;
+           _transformLast = eventTransform;
+           utilSetTransform(supersurface, tX, tY, scale);
+           scheduleRedraw();
+           dispatch$1.call('move', this, map);
 
+           function isInteger(val) {
+             return typeof val === 'number' && isFinite(val) && Math.floor(val) === val;
+           }
+         }
 
-               wrap = selection.selectAll('.form-field-input-wrap')
-                   .data([0]);
+         function resetTransform() {
+           if (!_isTransformed) return false;
+           utilSetTransform(supersurface, 0, 0);
+           _isTransformed = false;
 
-               wrap = wrap.enter()
-                   .append('div')
-                   .attr('class', 'form-field-input-wrap form-field-input-' + field.type)
-                   .merge(wrap);
+           if (context.inIntro()) {
+             curtainProjection.transform(projection.transform());
+           }
 
+           return true;
+         }
 
-               var div = wrap.selectAll('ul')
-                   .data([0]);
+         function redraw(difference, extent) {
+           if (surface.empty() || !_redrawEnabled) return; // If we are in the middle of a zoom/pan, we can't do differenced redraws.
+           // It would result in artifacts where differenced entities are redrawn with
+           // one transform and unchanged entities with another.
 
-               div = div.enter()
-                   .append('ul')
-                   .attr('class', 'rows')
-                   .merge(div);
+           if (resetTransform()) {
+             difference = extent = undefined;
+           }
 
-               var keys = ['cycleway:left', 'cycleway:right'];
+           var zoom = map.zoom();
+           var z = String(~~zoom);
 
-               items = div.selectAll('li')
-                   .data(keys);
+           if (surface.attr('data-zoom') !== z) {
+             surface.attr('data-zoom', z);
+           } // class surface as `lowzoom` around z17-z18.5 (based on latitude)
 
-               var enter = items.enter()
-                   .append('li')
-                   .attr('class', function(d) { return 'labeled-input preset-cycleway-' + stripcolon(d); });
 
-               enter
-                   .append('span')
-                   .attr('class', 'label preset-label-cycleway')
-                   .attr('for', function(d) { return 'preset-input-cycleway-' + stripcolon(d); })
-                   .text(function(d) { return field.t('types.' + d); });
+           var lat = map.center()[1];
+           var lowzoom = linear$2().domain([-60, 0, 60]).range([17, 18.5, 17]).clamp(true);
+           surface.classed('low-zoom', zoom <= lowzoom(lat));
 
-               enter
-                   .append('div')
-                   .attr('class', 'preset-input-cycleway-wrap')
-                   .append('input')
-                   .attr('type', 'text')
-                   .attr('class', function(d) { return 'preset-input-cycleway preset-input-' + stripcolon(d); })
-                   .call(utilNoAuto)
-                   .each(function(d) {
-                       select(this)
-                           .call(uiCombobox(context, 'cycleway-' + stripcolon(d))
-                               .data(cycleway.options(d))
-                           );
-                   });
+           if (!difference) {
+             supersurface.call(context.background());
+             wrapper.call(drawLayers);
+           } // OSM
 
-               items = items.merge(enter);
 
-               // Update
-               wrap.selectAll('.preset-input-cycleway')
-                   .on('change', change)
-                   .on('blur', change);
+           if (map.editableDataEnabled() || map.isInWideSelection()) {
+             context.loadTiles(projection);
+             drawEditable(difference, extent);
+           } else {
+             editOff();
            }
 
+           _transformStart = projection.transform();
+           return map;
+         }
 
-           function change(key) {
-
-               var newValue = context.cleanTagValue(utilGetSetValue(select(this)));
-
-               // don't override multiple values with blank string
-               if (!newValue && (Array.isArray(_tags.cycleway) || Array.isArray(_tags[key]))) return;
+         var immediateRedraw = function immediateRedraw(difference, extent) {
+           if (!difference && !extent) cancelPendingRedraw();
+           redraw(difference, extent);
+         };
 
-               if (newValue === 'none' || newValue === '') { newValue = undefined; }
+         map.lastPointerEvent = function () {
+           return _lastPointerEvent;
+         };
 
-               var otherKey = key === 'cycleway:left' ? 'cycleway:right' : 'cycleway:left';
-               var otherValue = typeof _tags.cycleway === 'string' ? _tags.cycleway : _tags[otherKey];
-               if (otherValue && Array.isArray(otherValue)) {
-                   // we must always have an explicit value for comparison
-                   otherValue = otherValue[0];
-               }
-               if (otherValue === 'none' || otherValue === '') { otherValue = undefined; }
+         map.mouse = function (d3_event) {
+           var event = _lastPointerEvent || d3_event;
 
-               var tag = {};
+           if (event) {
+             var s;
 
-               // If the left and right tags match, use the cycleway tag to tag both
-               // sides the same way
-               if (newValue === otherValue) {
-                   tag = {
-                       cycleway: newValue,
-                       'cycleway:left': undefined,
-                       'cycleway:right': undefined
-                   };
-               } else {
-                   // Always set both left and right as changing one can affect the other
-                   tag = {
-                       cycleway: undefined
-                   };
-                   tag[key] = newValue;
-                   tag[otherKey] = otherValue;
-               }
+             while (s = event.sourceEvent) {
+               event = s;
+             }
 
-               dispatch$1.call('change', this, tag);
+             return _getMouseCoords(event);
            }
 
+           return null;
+         }; // returns Lng/Lat
 
-           cycleway.options = function() {
-               return Object.keys(field.strings.options).map(function(option) {
-                   return {
-                       title: field.t('options.' + option + '.description'),
-                       value: option
-                   };
-               });
-           };
-
-
-           cycleway.tags = function(tags) {
-               _tags = tags;
-
-               // If cycleway is set, use that instead of individual values
-               var commonValue = typeof tags.cycleway === 'string' && tags.cycleway;
 
-               utilGetSetValue(items.selectAll('.preset-input-cycleway'), function(d) {
-                       if (commonValue) return commonValue;
-                       return !tags.cycleway && typeof tags[d] === 'string' ? tags[d] : '';
-                   })
-                   .attr('title', function(d) {
-                       if (Array.isArray(tags.cycleway) || Array.isArray(tags[d])) {
-                           var vals = [];
-                           if (Array.isArray(tags.cycleway)) {
-                               vals = vals.concat(tags.cycleway);
-                           }
-                           if (Array.isArray(tags[d])) {
-                               vals = vals.concat(tags[d]);
-                           }
-                           return vals.filter(Boolean).join('\n');
-                       }
-                       return null;
-                   })
-                   .attr('placeholder', function(d) {
-                       if (Array.isArray(tags.cycleway) || Array.isArray(tags[d])) {
-                           return _t('inspector.multiple_values');
-                       }
-                       return field.placeholder();
-                   })
-                   .classed('mixed', function(d) {
-                       return Array.isArray(tags.cycleway) || Array.isArray(tags[d]);
-                   });
-           };
+         map.mouseCoordinates = function () {
+           var coord = map.mouse() || pxCenter();
+           return projection.invert(coord);
+         };
 
+         map.dblclickZoomEnable = function (val) {
+           if (!arguments.length) return _dblClickZoomEnabled;
+           _dblClickZoomEnabled = val;
+           return map;
+         };
 
-           cycleway.focus = function() {
-               var node = wrap.selectAll('input').node();
-               if (node) node.focus();
-           };
+         map.redrawEnable = function (val) {
+           if (!arguments.length) return _redrawEnabled;
+           _redrawEnabled = val;
+           return map;
+         };
 
+         map.isTransformed = function () {
+           return _isTransformed;
+         };
 
-           return utilRebind(cycleway, dispatch$1, 'on');
-       }
+         function setTransform(t2, duration, force) {
+           var t = projection.transform();
+           if (!force && t2.k === t.k && t2.x === t.x && t2.y === t.y) return false;
 
-       function uiFieldLanes(field, context) {
-           var dispatch$1 = dispatch('change');
-           var LANE_WIDTH = 40;
-           var LANE_HEIGHT = 200;
-           var _entityIDs = [];
+           if (duration) {
+             _selection.transition().duration(duration).on('start', function () {
+               map.startEase();
+             }).call(_zoomerPanner.transform, identity$2.translate(t2.x, t2.y).scale(t2.k));
+           } else {
+             projection.transform(t2);
+             _transformStart = t2;
 
-           function lanes(selection) {
-               var lanesData = context.entity(_entityIDs[0]).lanes();
+             _selection.call(_zoomerPanner.transform, _transformStart);
+           }
 
-               if (!context.container().select('.inspector-wrap.inspector-hidden').empty() || !selection.node().parentNode) {
-                   selection.call(lanes.off);
-                   return;
-               }
+           return true;
+         }
 
-               var wrap = selection.selectAll('.form-field-input-wrap')
-                   .data([0]);
+         function setCenterZoom(loc2, z2, duration, force) {
+           var c = map.center();
+           var z = map.zoom();
+           if (loc2[0] === c[0] && loc2[1] === c[1] && z2 === z && !force) return false;
+           var proj = geoRawMercator().transform(projection.transform()); // copy projection
+
+           var k2 = clamp(geoZoomToScale(z2, TILESIZE), kMin, kMax);
+           proj.scale(k2);
+           var t = proj.translate();
+           var point = proj(loc2);
+           var center = pxCenter();
+           t[0] += center[0] - point[0];
+           t[1] += center[1] - point[1];
+           return setTransform(identity$2.translate(t[0], t[1]).scale(k2), duration, force);
+         }
+
+         map.pan = function (delta, duration) {
+           var t = projection.translate();
+           var k = projection.scale();
+           t[0] += delta[0];
+           t[1] += delta[1];
+
+           if (duration) {
+             _selection.transition().duration(duration).on('start', function () {
+               map.startEase();
+             }).call(_zoomerPanner.transform, identity$2.translate(t[0], t[1]).scale(k));
+           } else {
+             projection.translate(t);
+             _transformStart = projection.transform();
 
-               wrap = wrap.enter()
-                   .append('div')
-                   .attr('class', 'form-field-input-wrap form-field-input-' + field.type)
-                   .merge(wrap);
+             _selection.call(_zoomerPanner.transform, _transformStart);
 
-               var surface =  wrap.selectAll('.surface')
-                   .data([0]);
+             dispatch$1.call('move', this, map);
+             immediateRedraw();
+           }
 
-               var d = utilGetDimensions(wrap);
-               var freeSpace = d[0] - lanesData.lanes.length * LANE_WIDTH * 1.5 + LANE_WIDTH * 0.5;
+           return map;
+         };
 
-               surface = surface.enter()
-                   .append('svg')
-                   .attr('width', d[0])
-                   .attr('height', 300)
-                   .attr('class', 'surface')
-                   .merge(surface);
+         map.dimensions = function (val) {
+           if (!arguments.length) return _dimensions;
+           _dimensions = val;
+           drawLayers.dimensions(_dimensions);
+           context.background().dimensions(_dimensions);
+           projection.clipExtent([[0, 0], _dimensions]);
+           _getMouseCoords = utilFastMouse(supersurface.node());
+           scheduleRedraw();
+           return map;
+         };
 
+         function zoomIn(delta) {
+           setCenterZoom(map.center(), ~~map.zoom() + delta, 250, true);
+         }
 
-               var lanesSelection = surface.selectAll('.lanes')
-                   .data([0]);
+         function zoomOut(delta) {
+           setCenterZoom(map.center(), ~~map.zoom() - delta, 250, true);
+         }
 
-               lanesSelection = lanesSelection.enter()
-                   .append('g')
-                   .attr('class', 'lanes')
-                   .merge(lanesSelection);
+         map.zoomIn = function () {
+           zoomIn(1);
+         };
 
-               lanesSelection
-                   .attr('transform', function () {
-                       return 'translate(' + (freeSpace / 2) + ', 0)';
-                   });
+         map.zoomInFurther = function () {
+           zoomIn(4);
+         };
 
+         map.canZoomIn = function () {
+           return map.zoom() < maxZoom;
+         };
 
-               var lane = lanesSelection.selectAll('.lane')
-                  .data(lanesData.lanes);
-
-               lane.exit()
-                   .remove();
-
-               var enter = lane.enter()
-                   .append('g')
-                   .attr('class', 'lane');
-
-               enter
-                   .append('g')
-                   .append('rect')
-                   .attr('y', 50)
-                   .attr('width', LANE_WIDTH)
-                   .attr('height', LANE_HEIGHT);
-
-               enter
-                   .append('g')
-                   .attr('class', 'forward')
-                   .append('text')
-                   .attr('y', 40)
-                   .attr('x', 14)
-                   .text('▲');
-
-               enter
-                   .append('g')
-                   .attr('class', 'bothways')
-                   .append('text')
-                   .attr('y', 40)
-                   .attr('x', 14)
-                   .text('▲▼');
-
-               enter
-                   .append('g')
-                   .attr('class', 'backward')
-                   .append('text')
-                   .attr('y', 40)
-                   .attr('x', 14)
-                   .text('▼');
-
-
-               lane = lane
-                   .merge(enter);
-
-               lane
-                   .attr('transform', function(d) {
-                       return 'translate(' + (LANE_WIDTH * d.index * 1.5) + ', 0)';
-                   });
+         map.zoomOut = function () {
+           zoomOut(1);
+         };
 
-               lane.select('.forward')
-                   .style('visibility', function(d) {
-                       return d.direction === 'forward' ? 'visible' : 'hidden';
-                   });
+         map.zoomOutFurther = function () {
+           zoomOut(4);
+         };
 
-               lane.select('.bothways')
-                   .style('visibility', function(d) {
-                       return d.direction === 'bothways' ? 'visible' : 'hidden';
-                   });
+         map.canZoomOut = function () {
+           return map.zoom() > minZoom;
+         };
 
-               lane.select('.backward')
-                   .style('visibility', function(d) {
-                       return d.direction === 'backward' ? 'visible' : 'hidden';
-                   });
+         map.center = function (loc2) {
+           if (!arguments.length) {
+             return projection.invert(pxCenter());
            }
 
+           if (setCenterZoom(loc2, map.zoom())) {
+             dispatch$1.call('move', this, map);
+           }
 
-           lanes.entityIDs = function(val) {
-               _entityIDs = val;
-           };
+           scheduleRedraw();
+           return map;
+         };
 
-           lanes.tags = function() {};
-           lanes.focus = function() {};
-           lanes.off = function() {};
+         map.unobscuredCenterZoomEase = function (loc, zoom) {
+           var offset = map.unobscuredOffsetPx();
+           var proj = geoRawMercator().transform(projection.transform()); // copy projection
+           // use the target zoom to calculate the offset center
 
-           return utilRebind(lanes, dispatch$1, 'on');
-       }
+           proj.scale(geoZoomToScale(zoom, TILESIZE));
+           var locPx = proj(loc);
+           var offsetLocPx = [locPx[0] + offset[0], locPx[1] + offset[1]];
+           var offsetLoc = proj.invert(offsetLocPx);
+           map.centerZoomEase(offsetLoc, zoom);
+         };
 
-       uiFieldLanes.supportsMultiselection = false;
+         map.unobscuredOffsetPx = function () {
+           var openPane = context.container().select('.map-panes .map-pane.shown');
 
-       var _languagesArray = [];
+           if (!openPane.empty()) {
+             return [openPane.node().offsetWidth / 2, 0];
+           }
 
+           return [0, 0];
+         };
 
-       function uiFieldLocalized(field, context) {
-           var dispatch$1 = dispatch('change', 'input');
-           var wikipedia = services.wikipedia;
-           var input = select(null);
-           var localizedInputs = select(null);
-           var _countryCode;
-           var _tags;
+         map.zoom = function (z2) {
+           if (!arguments.length) {
+             return Math.max(geoScaleToZoom(projection.scale(), TILESIZE), 0);
+           }
 
+           if (z2 < _minzoom) {
+             surface.interrupt();
+             dispatch$1.call('hitMinZoom', this, map);
+             z2 = context.minEditableZoom();
+           }
 
-           // A concern here in switching to async data means that _languagesArray will not
-           // be available the first time through, so things like the fetchers and
-           // the language() function will not work immediately.
-           _mainFileFetcher.get('languages')
-               .then(loadLanguagesArray)
-               .catch(function() { /* ignore */ });
+           if (setCenterZoom(map.center(), z2)) {
+             dispatch$1.call('move', this, map);
+           }
 
-           var _territoryLanguages = {};
-           _mainFileFetcher.get('territory_languages')
-               .then(function(d) { _territoryLanguages = d; })
-               .catch(function() { /* ignore */ });
+           scheduleRedraw();
+           return map;
+         };
 
+         map.centerZoom = function (loc2, z2) {
+           if (setCenterZoom(loc2, z2)) {
+             dispatch$1.call('move', this, map);
+           }
 
-           var allSuggestions = _mainPresetIndex.collection.filter(function(p) {
-               return p.suggestion === true;
-           });
+           scheduleRedraw();
+           return map;
+         };
 
-           // reuse these combos
-           var langCombo = uiCombobox(context, 'localized-lang')
-               .fetcher(fetchLanguages)
-               .minItems(0);
+         map.zoomTo = function (entity) {
+           var extent = entity.extent(context.graph());
+           if (!isFinite(extent.area())) return map;
+           var z2 = clamp(map.trimmedExtentZoom(extent), 0, 20);
+           return map.centerZoom(extent.center(), z2);
+         };
 
-           var brandCombo = uiCombobox(context, 'localized-brand')
-               .canAutocomplete(false)
-               .minItems(1);
+         map.centerEase = function (loc2, duration) {
+           duration = duration || 250;
+           setCenterZoom(loc2, map.zoom(), duration);
+           return map;
+         };
 
-           var _selection = select(null);
-           var _multilingual = [];
-           var _buttonTip = uiTooltip()
-               .title(_t('translate.translate'))
-               .placement('left');
-           var _wikiTitles;
-           var _entityIDs = [];
+         map.zoomEase = function (z2, duration) {
+           duration = duration || 250;
+           setCenterZoom(map.center(), z2, duration, false);
+           return map;
+         };
 
+         map.centerZoomEase = function (loc2, z2, duration) {
+           duration = duration || 250;
+           setCenterZoom(loc2, z2, duration, false);
+           return map;
+         };
 
-           function loadLanguagesArray(dataLanguages) {
-               if (_languagesArray.length !== 0) return;
+         map.transformEase = function (t2, duration) {
+           duration = duration || 250;
+           setTransform(t2, duration, false
+           /* don't force */
+           );
+           return map;
+         };
 
-               // some conversion is needed to ensure correct OSM tags are used
-               var replacements = {
-                   sr: 'sr-Cyrl',      // in OSM, `sr` implies Cyrillic
-                   'sr-Cyrl': false    // `sr-Cyrl` isn't used in OSM
-               };
+         map.zoomToEase = function (obj, duration) {
+           var extent;
 
-               for (var code in dataLanguages) {
-                   if (replacements[code] === false) continue;
-                   var metaCode = code;
-                   if (replacements[code]) metaCode = replacements[code];
+           if (Array.isArray(obj)) {
+             obj.forEach(function (entity) {
+               var entityExtent = entity.extent(context.graph());
 
-                   _languagesArray.push({
-                       localName: _mainLocalizer.languageName(metaCode, { localOnly: true }),
-                       nativeName: dataLanguages[metaCode].nativeName,
-                       code: code,
-                       label: _mainLocalizer.languageName(metaCode)
-                   });
+               if (!extent) {
+                 extent = entityExtent;
+               } else {
+                 extent = extent.extend(entityExtent);
                }
+             });
+           } else {
+             extent = obj.extent(context.graph());
            }
 
+           if (!isFinite(extent.area())) return map;
+           var z2 = clamp(map.trimmedExtentZoom(extent), 0, 20);
+           return map.centerZoomEase(extent.center(), z2, duration);
+         };
 
-           function calcLocked() {
-
-               // only lock the Name field
-               var isLocked = field.id === 'name' &&
-                   _entityIDs.length &&
-                   // lock the field if any feature needs it
-                   _entityIDs.some(function(entityID) {
-
-                       var entity = context.graph().hasEntity(entityID);
-                       if (!entity) return false;
-
-                       var original = context.graph().base().entities[_entityIDs[0]];
-                       var hasOriginalName = original && entity.tags.name && entity.tags.name === original.tags.name;
-                       // if the name was already edited manually then allow further editing
-                       if (!hasOriginalName) return false;
-
-                       // features linked to Wikidata are likely important and should be protected
-                       if (entity.tags.wikidata) return true;
+         map.startEase = function () {
+           utilBindOnce(surface, _pointerPrefix + 'down.ease', function () {
+             map.cancelEase();
+           });
+           return map;
+         };
 
-                       // assume the name has already been confirmed if its source has been researched
-                       if (entity.tags['name:etymology:wikidata']) return true;
+         map.cancelEase = function () {
+           _selection.interrupt();
 
-                       var preset = _mainPresetIndex.match(entity, context.graph());
-                       var isSuggestion = preset && preset.suggestion;
-                       var showsBrand = preset && preset.originalFields.filter(function(d) {
-                           return d.id === 'brand';
-                       }).length;
-                       // protect standardized brand names
-                       return isSuggestion && !showsBrand;
-                   });
+           return map;
+         };
 
-               field.locked(isLocked);
+         map.extent = function (val) {
+           if (!arguments.length) {
+             return new geoExtent(projection.invert([0, _dimensions[1]]), projection.invert([_dimensions[0], 0]));
+           } else {
+             var extent = geoExtent(val);
+             map.centerZoom(extent.center(), map.extentZoom(extent));
            }
+         };
 
-
-           // update _multilingual, maintaining the existing order
-           function calcMultilingual(tags) {
-               var existingLangsOrdered = _multilingual.map(function(item) {
-                   return item.lang;
-               });
-               var existingLangs = new Set(existingLangsOrdered.filter(Boolean));
-
-               for (var k in tags) {
-                   var m = k.match(/^(.*):([a-zA-Z_-]+)$/);
-                   if (m && m[1] === field.key && m[2]) {
-                       var item = { lang: m[2], value: tags[k] };
-                       if (existingLangs.has(item.lang)) {
-                           // update the value
-                           _multilingual[existingLangsOrdered.indexOf(item.lang)].value = item.value;
-                           existingLangs.delete(item.lang);
-                       } else {
-                           _multilingual.push(item);
-                       }
-                   }
-               }
-
-               _multilingual = _multilingual.filter(function(item) {
-                   return !item.lang || !existingLangs.has(item.lang);
-               });
+         map.trimmedExtent = function (val) {
+           if (!arguments.length) {
+             var headerY = 71;
+             var footerY = 30;
+             var pad = 10;
+             return new geoExtent(projection.invert([pad, _dimensions[1] - footerY - pad]), projection.invert([_dimensions[0] - pad, headerY + pad]));
+           } else {
+             var extent = geoExtent(val);
+             map.centerZoom(extent.center(), map.trimmedExtentZoom(extent));
            }
+         };
 
+         function calcExtentZoom(extent, dim) {
+           var tl = projection([extent[0][0], extent[1][1]]);
+           var br = projection([extent[1][0], extent[0][1]]); // Calculate maximum zoom that fits extent
 
-           function localized(selection) {
-               _selection = selection;
-               calcLocked();
-               var isLocked = field.locked();
-               var singularEntity = _entityIDs.length === 1 && context.hasEntity(_entityIDs[0]);
-               var preset = singularEntity && _mainPresetIndex.match(singularEntity, context.graph());
-
-               var wrap = selection.selectAll('.form-field-input-wrap')
-                   .data([0]);
+           var hFactor = (br[0] - tl[0]) / dim[0];
+           var vFactor = (br[1] - tl[1]) / dim[1];
+           var hZoomDiff = Math.log(Math.abs(hFactor)) / Math.LN2;
+           var vZoomDiff = Math.log(Math.abs(vFactor)) / Math.LN2;
+           var newZoom = map.zoom() - Math.max(hZoomDiff, vZoomDiff);
+           return newZoom;
+         }
 
-               // enter/update
-               wrap = wrap.enter()
-                   .append('div')
-                   .attr('class', 'form-field-input-wrap form-field-input-' + field.type)
-                   .merge(wrap);
-
-               input = wrap.selectAll('.localized-main')
-                   .data([0]);
-
-               // enter/update
-               input = input.enter()
-                   .append('input')
-                   .attr('type', 'text')
-                   .attr('id', field.domId)
-                   .attr('class', 'localized-main')
-                   .call(utilNoAuto)
-                   .merge(input);
-
-               if (preset && field.id === 'name') {
-                   var pTag = preset.id.split('/', 2);
-                   var pKey = pTag[0];
-                   var pValue = pTag[1];
-
-                   if (!preset.suggestion) {
-                       // Not a suggestion preset - Add a suggestions dropdown if it makes sense to.
-                       // This code attempts to determine if the matched preset is the
-                       // kind of preset that even can benefit from name suggestions..
-                       // - true = shops, cafes, hotels, etc. (also generic and fallback presets)
-                       // - false = churches, parks, hospitals, etc. (things not in the index)
-                       var isFallback = preset.isFallback();
-                       var goodSuggestions = allSuggestions.filter(function(s) {
-                           if (isFallback) return true;
-                           var sTag = s.id.split('/', 2);
-                           var sKey = sTag[0];
-                           var sValue = sTag[1];
-                           return pKey === sKey && (!pValue || pValue === sValue);
-                       });
+         map.extentZoom = function (val) {
+           return calcExtentZoom(geoExtent(val), _dimensions);
+         };
 
-                       // Show the suggestions.. If the user picks one, change the tags..
-                       if (allSuggestions.length && goodSuggestions.length) {
-                           input
-                               .on('blur.localized', checkBrandOnBlur)
-                               .call(brandCombo
-                                   .fetcher(fetchBrandNames(preset, allSuggestions))
-                                   .on('accept', acceptBrand)
-                                   .on('cancel', cancelBrand)
-                               );
-                       }
-                   }
-               }
+         map.trimmedExtentZoom = function (val) {
+           var trimY = 120;
+           var trimX = 40;
+           var trimmed = [_dimensions[0] - trimX, _dimensions[1] - trimY];
+           return calcExtentZoom(geoExtent(val), trimmed);
+         };
 
-               input
-                   .classed('disabled', !!isLocked)
-                   .attr('readonly', isLocked || null)
-                   .on('input', change(true))
-                   .on('blur', change())
-                   .on('change', change());
+         map.withinEditableZoom = function () {
+           return map.zoom() >= context.minEditableZoom();
+         };
 
+         map.isInWideSelection = function () {
+           return !map.withinEditableZoom() && context.selectedIDs().length;
+         };
 
-               var translateButton = wrap.selectAll('.localized-add')
-                   .data([0]);
+         map.editableDataEnabled = function (skipZoomCheck) {
+           var layer = context.layers().layer('osm');
+           if (!layer || !layer.enabled()) return false;
+           return skipZoomCheck || map.withinEditableZoom();
+         };
 
-               translateButton = translateButton.enter()
-                   .append('button')
-                   .attr('class', 'localized-add form-field-button')
-                   .attr('tabindex', -1)
-                   .call(svgIcon('#iD-icon-plus'))
-                   .merge(translateButton);
+         map.notesEditable = function () {
+           var layer = context.layers().layer('notes');
+           if (!layer || !layer.enabled()) return false;
+           return map.withinEditableZoom();
+         };
 
-               translateButton
-                   .classed('disabled', !!isLocked)
-                   .call(isLocked ? _buttonTip.destroy : _buttonTip)
-                   .on('click', addNew);
+         map.minzoom = function (val) {
+           if (!arguments.length) return _minzoom;
+           _minzoom = val;
+           return map;
+         };
 
+         map.toggleHighlightEdited = function () {
+           surface.classed('highlight-edited', !surface.classed('highlight-edited'));
+           map.pan([0, 0]); // trigger a redraw
 
-               if (_tags && !_multilingual.length) {
-                   calcMultilingual(_tags);
-               }
+           dispatch$1.call('changeHighlighting', this);
+         };
 
-               localizedInputs = selection.selectAll('.localized-multilingual')
-                   .data([0]);
+         map.areaFillOptions = ['wireframe', 'partial', 'full'];
 
-               localizedInputs = localizedInputs.enter()
-                   .append('div')
-                   .attr('class', 'localized-multilingual')
-                   .merge(localizedInputs);
+         map.activeAreaFill = function (val) {
+           if (!arguments.length) return corePreferences('area-fill') || 'partial';
+           corePreferences('area-fill', val);
 
-               localizedInputs
-                   .call(renderMultilingual);
+           if (val !== 'wireframe') {
+             corePreferences('area-fill-toggle', val);
+           }
 
-               localizedInputs.selectAll('button, input')
-                   .classed('disabled', !!isLocked)
-                   .attr('readonly', isLocked || null);
+           updateAreaFill();
+           map.pan([0, 0]); // trigger a redraw
 
+           dispatch$1.call('changeAreaFill', this);
+           return map;
+         };
 
+         map.toggleWireframe = function () {
+           var activeFill = map.activeAreaFill();
 
-               // We are not guaranteed to get an `accept` or `cancel` when blurring the field.
-               // (This can happen if the user actives the combo, arrows down, and then clicks off to blur)
-               // So compare the current field value against the suggestions one last time.
-               function checkBrandOnBlur() {
-                   var latest = _entityIDs.length === 1 && context.hasEntity(_entityIDs[0]);
-                   if (!latest) return;   // deleting the entity blurred the field?
+           if (activeFill === 'wireframe') {
+             activeFill = corePreferences('area-fill-toggle') || 'partial';
+           } else {
+             activeFill = 'wireframe';
+           }
 
-                   var preset = _mainPresetIndex.match(latest, context.graph());
-                   if (preset && preset.suggestion) return;   // already accepted
+           map.activeAreaFill(activeFill);
+         };
 
-                   // note: here we are testing against "decorated" names, i.e. 'Starbucks – Cafe'
-                   var name = utilGetSetValue(input).trim();
-                   var matched = allSuggestions.filter(function(s) { return name === s.name(); });
+         function updateAreaFill() {
+           var activeFill = map.activeAreaFill();
+           map.areaFillOptions.forEach(function (opt) {
+             surface.classed('fill-' + opt, Boolean(opt === activeFill));
+           });
+         }
 
-                   if (matched.length === 1) {
-                       acceptBrand({ suggestion: matched[0] });
-                   } else {
-                       cancelBrand();
-                   }
-               }
+         map.layers = function () {
+           return drawLayers;
+         };
 
+         map.doubleUpHandler = function () {
+           return _doubleUpHandler;
+         };
 
-               function acceptBrand(d) {
+         return utilRebind(map, dispatch$1, 'on');
+       }
 
-                   var entity = _entityIDs.length === 1 && context.hasEntity(_entityIDs[0]);
+       function rendererPhotos(context) {
+         var dispatch$1 = dispatch('change');
+         var _layerIDs = ['streetside', 'mapillary', 'mapillary-map-features', 'mapillary-signs', 'openstreetcam'];
+         var _allPhotoTypes = ['flat', 'panoramic'];
 
-                   if (!d || !entity) {
-                       cancelBrand();
-                       return;
-                   }
+         var _shownPhotoTypes = _allPhotoTypes.slice(); // shallow copy
 
-                   var tags = entity.tags;
-                   var geometry = entity.geometry(context.graph());
-                   var removed = preset.unsetTags(tags, geometry);
-                   for (var k in tags) {
-                       tags[k] = removed[k];  // set removed tags to `undefined`
-                   }
-                   tags = d.suggestion.setTags(tags, geometry);
-                   utilGetSetValue(input, tags.name);
-                   dispatch$1.call('change', this, tags);
-               }
 
+         var _dateFilters = ['fromDate', 'toDate'];
 
-               // user hit escape, clean whatever preset name appears after the last ' – '
-               function cancelBrand() {
-                   var name = utilGetSetValue(input);
-                   var clean = cleanName(name);
-                   if (clean !== name) {
-                       utilGetSetValue(input, clean);
-                       dispatch$1.call('change', this, { name: clean });
-                   }
-               }
+         var _fromDate;
 
-               // Remove whatever is after the last ' – '
-               // NOTE: split/join on en-dash, not a hypen (to avoid conflict with fr - nl names in Brussels etc)
-               function cleanName(name) {
-                   var parts = name.split(' – ');
-                   if (parts.length > 1) {
-                       parts.pop();
-                       name = parts.join(' – ');
-                   }
-                   return name;
-               }
-
-
-               function fetchBrandNames(preset, suggestions) {
-                   var pTag = preset.id.split('/', 2);
-                   var pKey = pTag[0];
-                   var pValue = pTag[1];
-
-                   return function(value, callback) {
-                       var results = [];
-                       if (value && value.length > 2) {
-                           for (var i = 0; i < suggestions.length; i++) {
-                               var s = suggestions[i];
-
-                               // don't suggest brands from incompatible countries
-                               if (_countryCode && s.countryCodes &&
-                                   s.countryCodes.indexOf(_countryCode) === -1) continue;
-
-                               var sTag = s.id.split('/', 2);
-                               var sKey = sTag[0];
-                               var sValue = sTag[1];
-                               var name = s.name();
-                               var dist = utilEditDistance(value, name.substring(0, value.length));
-                               var matchesPreset = (pKey === sKey && (!pValue || pValue === sValue));
-
-                               if (dist < 1 || (matchesPreset && dist < 3)) {
-                                   var obj = {
-                                       title: name,
-                                       value: name,
-                                       suggestion: s,
-                                       dist: dist + (matchesPreset ? 0 : 1)  // penalize if not matched preset
-                                   };
-                                   results.push(obj);
-                               }
-                           }
-                           results.sort(function(a, b) { return a.dist - b.dist; });
-                       }
-                       results = results.slice(0, 10);
-                       callback(results);
-                   };
-               }
+         var _toDate;
 
+         var _usernames;
 
-               function addNew() {
-                   event.preventDefault();
-                   if (field.locked()) return;
+         function photos() {}
 
-                   var defaultLang = _mainLocalizer.languageCode().toLowerCase();
-                   var langExists = _multilingual.find(function(datum) { return datum.lang === defaultLang; });
-                   var isLangEn = defaultLang.indexOf('en') > -1;
-                   if (isLangEn || langExists) {
-                       defaultLang = '';
-                       langExists = _multilingual.find(function(datum) { return datum.lang === defaultLang; });
-                   }
+         function updateStorage() {
+           if (window.mocha) return;
+           var hash = utilStringQs(window.location.hash);
+           var enabled = context.layers().all().filter(function (d) {
+             return _layerIDs.indexOf(d.id) !== -1 && d.layer && d.layer.supported() && d.layer.enabled();
+           }).map(function (d) {
+             return d.id;
+           });
 
-                   if (!langExists) {
-                       // prepend the value so it appears at the top
-                       _multilingual.unshift({ lang: defaultLang, value: '' });
+           if (enabled.length) {
+             hash.photo_overlay = enabled.join(',');
+           } else {
+             delete hash.photo_overlay;
+           }
 
-                       localizedInputs
-                           .call(renderMultilingual);
-                   }
-               }
+           window.location.replace('#' + utilQsString(hash, true));
+         }
 
+         photos.overlayLayerIDs = function () {
+           return _layerIDs;
+         };
 
-               function change(onInput) {
-                   return function() {
-                       if (field.locked()) {
-                           event.preventDefault();
-                           return;
-                       }
+         photos.allPhotoTypes = function () {
+           return _allPhotoTypes;
+         };
 
-                       var val = utilGetSetValue(select(this));
-                       if (!onInput) val = context.cleanTagValue(val);
+         photos.dateFilters = function () {
+           return _dateFilters;
+         };
 
-                       // don't override multiple values with blank string
-                       if (!val && Array.isArray(_tags[field.key])) return;
+         photos.dateFilterValue = function (val) {
+           return val === _dateFilters[0] ? _fromDate : _toDate;
+         };
 
-                       var t = {};
+         photos.setDateFilter = function (type, val, updateUrl) {
+           // validate the date
+           var date = val && new Date(val);
 
-                       t[field.key] = val || undefined;
-                       dispatch$1.call('change', this, t, onInput);
-                   };
-               }
+           if (date && !isNaN(date)) {
+             val = date.toISOString().substr(0, 10);
+           } else {
+             val = null;
            }
 
+           if (type === _dateFilters[0]) {
+             _fromDate = val;
 
-           function key(lang) {
-               return field.key + ':' + lang;
+             if (_fromDate && _toDate && new Date(_toDate) < new Date(_fromDate)) {
+               _toDate = _fromDate;
+             }
            }
 
+           if (type === _dateFilters[1]) {
+             _toDate = val;
 
-           function changeLang(d) {
-               var tags = {};
+             if (_fromDate && _toDate && new Date(_toDate) < new Date(_fromDate)) {
+               _fromDate = _toDate;
+             }
+           }
 
-               // make sure unrecognized suffixes are lowercase - #7156
-               var lang = utilGetSetValue(select(this)).toLowerCase();
+           dispatch$1.call('change', this);
 
-               var language = _languagesArray.find(function(d) {
-                   return d.label.toLowerCase() === lang ||
-                       (d.localName && d.localName.toLowerCase() === lang) ||
-                       (d.nativeName && d.nativeName.toLowerCase() === lang);
-               });
-               if (language) lang = language.code;
+           if (updateUrl) {
+             var rangeString;
 
-               if (d.lang && d.lang !== lang) {
-                   tags[key(d.lang)] = undefined;
-               }
+             if (_fromDate || _toDate) {
+               rangeString = (_fromDate || '') + '_' + (_toDate || '');
+             }
 
-               var newKey = lang && context.cleanTagKey(key(lang));
+             setUrlFilterValue('photo_dates', rangeString);
+           }
+         };
 
-               var value = utilGetSetValue(select(this.parentNode).selectAll('.localized-value'));
+         photos.setUsernameFilter = function (val, updateUrl) {
+           if (val && typeof val === 'string') val = val.replace(/;/g, ',').split(',');
 
-               if (newKey && value) {
-                   tags[newKey] = value;
-               } else if (newKey && _wikiTitles && _wikiTitles[d.lang]) {
-                   tags[newKey] = _wikiTitles[d.lang];
-               }
+           if (val) {
+             val = val.map(function (d) {
+               return d.trim();
+             }).filter(Boolean);
 
-               d.lang = lang;
-               dispatch$1.call('change', this, tags);
+             if (!val.length) {
+               val = null;
+             }
            }
 
+           _usernames = val;
+           dispatch$1.call('change', this);
 
-           function changeValue(d) {
-               if (!d.lang) return;
-               var value = context.cleanTagValue(utilGetSetValue(select(this))) || undefined;
+           if (updateUrl) {
+             var hashString;
 
-               // don't override multiple values with blank string
-               if (!value && Array.isArray(d.value)) return;
+             if (_usernames) {
+               hashString = _usernames.join(',');
+             }
 
-               var t = {};
-               t[key(d.lang)] = value;
-               d.value = value;
-               dispatch$1.call('change', this, t);
+             setUrlFilterValue('photo_username', hashString);
            }
+         };
 
+         function setUrlFilterValue(property, val) {
+           if (!window.mocha) {
+             var hash = utilStringQs(window.location.hash);
 
-           function fetchLanguages(value, cb) {
-               var v = value.toLowerCase();
-
-               // show the user's language first
-               var langCodes = [_mainLocalizer.localeCode(), _mainLocalizer.languageCode()];
-
-               if (_countryCode && _territoryLanguages[_countryCode]) {
-                   langCodes = langCodes.concat(_territoryLanguages[_countryCode]);
-               }
+             if (val) {
+               if (hash[property] === val) return;
+               hash[property] = val;
+             } else {
+               if (!(property in hash)) return;
+               delete hash[property];
+             }
 
-               var langItems = [];
-               langCodes.forEach(function(code) {
-                   var langItem = _languagesArray.find(function(item) {
-                       return item.code === code;
-                   });
-                   if (langItem) langItems.push(langItem);
-               });
-               langItems = utilArrayUniq(langItems.concat(_languagesArray));
-
-               cb(langItems.filter(function(d) {
-                   return d.label.toLowerCase().indexOf(v) >= 0 ||
-                       (d.localName && d.localName.toLowerCase().indexOf(v) >= 0) ||
-                       (d.nativeName && d.nativeName.toLowerCase().indexOf(v) >= 0) ||
-                       d.code.toLowerCase().indexOf(v) >= 0;
-               }).map(function(d) {
-                   return { value: d.label };
-               }));
+             window.location.replace('#' + utilQsString(hash, true));
            }
+         }
 
+         function showsLayer(id) {
+           var layer = context.layers().layer(id);
+           return layer && layer.supported() && layer.enabled();
+         }
 
-           function renderMultilingual(selection) {
-               var entries = selection.selectAll('div.entry')
-                   .data(_multilingual, function(d) { return d.lang; });
+         photos.shouldFilterByDate = function () {
+           return showsLayer('mapillary') || showsLayer('openstreetcam') || showsLayer('streetside');
+         };
 
-               entries.exit()
-                   .style('top', '0')
-                   .style('max-height', '240px')
-                   .transition()
-                   .duration(200)
-                   .style('opacity', '0')
-                   .style('max-height', '0px')
-                   .remove();
+         photos.shouldFilterByPhotoType = function () {
+           return showsLayer('mapillary') || showsLayer('streetside') && showsLayer('openstreetcam');
+         };
 
-               var entriesEnter = entries.enter()
-                   .append('div')
-                   .attr('class', 'entry')
-                   .each(function(_, index) {
-                       var wrap = select(this);
-
-                       var domId = utilUniqueDomId(index);
-
-                       var label = wrap
-                           .append('label')
-                           .attr('class', 'field-label')
-                           .attr('for', domId);
-
-                       var text = label
-                           .append('span')
-                           .attr('class', 'label-text');
-
-                       text
-                           .append('span')
-                           .attr('class', 'label-textvalue')
-                           .text(_t('translate.localized_translation_label'));
-
-                       text
-                           .append('span')
-                           .attr('class', 'label-textannotation');
-
-                       label
-                           .append('button')
-                           .attr('class', 'remove-icon-multilingual')
-                           .on('click', function(d, index) {
-                               if (field.locked()) return;
-                               event.preventDefault();
-
-                               if (!d.lang || !d.value) {
-                                   _multilingual.splice(index, 1);
-                                   renderMultilingual(selection);
-                               } else {
-                                   // remove from entity tags
-                                   var t = {};
-                                   t[key(d.lang)] = undefined;
-                                   dispatch$1.call('change', this, t);
-                               }
-
-                           })
-                           .call(svgIcon('#iD-operation-delete'));
-
-                       wrap
-                           .append('input')
-                           .attr('class', 'localized-lang')
-                           .attr('id', domId)
-                           .attr('type', 'text')
-                           .attr('placeholder', _t('translate.localized_translation_language'))
-                           .on('blur', changeLang)
-                           .on('change', changeLang)
-                           .call(langCombo);
-
-                       wrap
-                           .append('input')
-                           .attr('type', 'text')
-                           .attr('class', 'localized-value')
-                           .on('blur', changeValue)
-                           .on('change', changeValue);
-                   });
+         photos.shouldFilterByUsername = function () {
+           return showsLayer('mapillary') || showsLayer('openstreetcam') || showsLayer('streetside');
+         };
 
-               entriesEnter
-                   .style('margin-top', '0px')
-                   .style('max-height', '0px')
-                   .style('opacity', '0')
-                   .transition()
-                   .duration(200)
-                   .style('margin-top', '10px')
-                   .style('max-height', '240px')
-                   .style('opacity', '1')
-                   .on('end', function() {
-                       select(this)
-                           .style('max-height', '')
-                           .style('overflow', 'visible');
-                   });
+         photos.showsPhotoType = function (val) {
+           if (!photos.shouldFilterByPhotoType()) return true;
+           return _shownPhotoTypes.indexOf(val) !== -1;
+         };
 
-               entries = entries.merge(entriesEnter);
+         photos.showsFlat = function () {
+           return photos.showsPhotoType('flat');
+         };
 
-               entries.order();
+         photos.showsPanoramic = function () {
+           return photos.showsPhotoType('panoramic');
+         };
 
-               entries.classed('present', function(d) {
-                   return d.lang && d.value;
-               });
+         photos.fromDate = function () {
+           return _fromDate;
+         };
 
-               utilGetSetValue(entries.select('.localized-lang'), function(d) {
-                   return _mainLocalizer.languageName(d.lang);
-               });
+         photos.toDate = function () {
+           return _toDate;
+         };
 
-               utilGetSetValue(entries.select('.localized-value'), function(d) {
-                       return typeof d.value === 'string' ? d.value : '';
-                   })
-                   .attr('title', function(d) {
-                       return Array.isArray(d.value) ? d.value.filter(Boolean).join('\n') : null;
-                   })
-                   .attr('placeholder', function(d) {
-                       return Array.isArray(d.value) ? _t('inspector.multiple_values') : _t('translate.localized_translation_name');
-                   })
-                   .classed('mixed', function(d) {
-                       return Array.isArray(d.value);
-                   });
+         photos.togglePhotoType = function (val) {
+           var index = _shownPhotoTypes.indexOf(val);
+
+           if (index !== -1) {
+             _shownPhotoTypes.splice(index, 1);
+           } else {
+             _shownPhotoTypes.push(val);
            }
 
+           dispatch$1.call('change', this);
+           return photos;
+         };
 
-           localized.tags = function(tags) {
-               _tags = tags;
+         photos.usernames = function () {
+           return _usernames;
+         };
 
-               // Fetch translations from wikipedia
-               if (typeof tags.wikipedia === 'string' && !_wikiTitles) {
-                   _wikiTitles = {};
-                   var wm = tags.wikipedia.match(/([^:]+):(.+)/);
-                   if (wm && wm[0] && wm[1]) {
-                       wikipedia.translations(wm[1], wm[2], function(err, d) {
-                           if (err || !d) return;
-                           _wikiTitles = d;
-                       });
-                   }
-               }
+         photos.init = function () {
+           var hash = utilStringQs(window.location.hash);
 
-               var isMixed = Array.isArray(tags[field.key]);
+           if (hash.photo_dates) {
+             // expect format like `photo_dates=2019-01-01_2020-12-31`, but allow a couple different separators
+             var parts = /^(.*)[–_](.*)$/g.exec(hash.photo_dates.trim());
+             this.setDateFilter('fromDate', parts && parts.length >= 2 && parts[1], false);
+             this.setDateFilter('toDate', parts && parts.length >= 3 && parts[2], false);
+           }
 
-               utilGetSetValue(input, typeof tags[field.key] === 'string' ? tags[field.key] : '')
-                   .attr('title', isMixed ? tags[field.key].filter(Boolean).join('\n') : undefined)
-                   .attr('placeholder', isMixed ? _t('inspector.multiple_values') : field.placeholder())
-                   .classed('mixed', isMixed);
+           if (hash.photo_username) {
+             this.setUsernameFilter(hash.photo_username, false);
+           }
 
-               calcMultilingual(tags);
+           if (hash.photo_overlay) {
+             // support enabling photo layers by default via a URL parameter, e.g. `photo_overlay=openstreetcam;mapillary;streetside`
+             var hashOverlayIDs = hash.photo_overlay.replace(/;/g, ',').split(',');
+             hashOverlayIDs.forEach(function (id) {
+               var layer = _layerIDs.indexOf(id) !== -1 && context.layers().layer(id);
+               if (layer && !layer.enabled()) layer.enabled(true);
+             });
+           }
 
-               _selection
-                   .call(localized);
-           };
+           if (hash.photo) {
+             // support opening a photo via a URL parameter, e.g. `photo=mapillary-fztgSDtLpa08ohPZFZjeRQ`
+             var photoIds = hash.photo.replace(/;/g, ',').split(',');
+             var photoId = photoIds.length && photoIds[0].trim();
+             var results = /(.*)\/(.*)/g.exec(photoId);
+
+             if (results && results.length >= 3) {
+               var serviceId = results[1];
+               var photoKey = results[2];
+               var service = services[serviceId];
+
+               if (service && service.ensureViewerLoaded) {
+                 // if we're showing a photo then make sure its layer is enabled too
+                 var layer = _layerIDs.indexOf(serviceId) !== -1 && context.layers().layer(serviceId);
+                 if (layer && !layer.enabled()) layer.enabled(true);
+                 var baselineTime = Date.now();
+                 service.on('loadedImages.rendererPhotos', function () {
+                   // don't open the viewer if too much time has elapsed
+                   if (Date.now() - baselineTime > 45000) {
+                     service.on('loadedImages.rendererPhotos', null);
+                     return;
+                   }
 
+                   if (!service.cachedImage(photoKey)) return;
+                   service.on('loadedImages.rendererPhotos', null);
+                   service.ensureViewerLoaded(context).then(function () {
+                     service.selectImage(context, photoKey).showViewer(context);
+                   });
+                 });
+               }
+             }
+           }
 
-           localized.focus = function() {
-               input.node().focus();
-           };
+           context.layers().on('change.rendererPhotos', updateStorage);
+         };
 
+         return utilRebind(photos, dispatch$1, 'on');
+       }
 
-           localized.entityIDs = function(val) {
-               if (!arguments.length) return _entityIDs;
-               _entityIDs = val;
-               _multilingual = [];
-               loadCountryCode();
-               return localized;
-           };
+       function uiAccount(context) {
+         var osm = context.connection();
 
-           function loadCountryCode() {
-               var extent = combinedEntityExtent();
-               var countryCode = extent && iso1A2Code(extent.center());
-               _countryCode = countryCode && countryCode.toLowerCase();
-           }
+         function update(selection) {
+           if (!osm) return;
 
-           function combinedEntityExtent() {
-               return _entityIDs && _entityIDs.length && utilTotalExtent(_entityIDs, context.graph());
+           if (!osm.authenticated()) {
+             selection.selectAll('.userLink, .logoutLink').classed('hide', true);
+             return;
            }
 
-           return utilRebind(localized, dispatch$1, 'on');
-       }
-
-       function uiFieldMaxspeed(field, context) {
-           var dispatch$1 = dispatch('change');
-           var unitInput = select(null);
-           var input = select(null);
-           var _entityIDs = [];
-           var _tags;
-           var _isImperial;
+           osm.userDetails(function (err, details) {
+             var userLink = selection.select('.userLink'),
+                 logoutLink = selection.select('.logoutLink');
+             userLink.html('');
+             logoutLink.html('');
+             if (err || !details) return;
+             selection.selectAll('.userLink, .logoutLink').classed('hide', false); // Link
 
-           var speedCombo = uiCombobox(context, 'maxspeed');
-           var unitCombo = uiCombobox(context, 'maxspeed-unit')
-                   .data(['km/h', 'mph'].map(comboValues));
+             var userLinkA = userLink.append('a').attr('href', osm.userURL(details.display_name)).attr('target', '_blank'); // Add thumbnail or dont
 
-           var metricValues = [20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120];
-           var imperialValues = [5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80];
+             if (details.image_url) {
+               userLinkA.append('img').attr('class', 'icon pre-text user-icon').attr('src', details.image_url);
+             } else {
+               userLinkA.call(svgIcon('#iD-icon-avatar', 'pre-text light'));
+             } // Add user name
 
 
-           function maxspeed(selection) {
+             userLinkA.append('span').attr('class', 'label').html(details.display_name);
+             logoutLink.append('a').attr('class', 'logout').attr('href', '#').html(_t.html('logout')).on('click.logout', function (d3_event) {
+               d3_event.preventDefault();
+               osm.logout();
+             });
+           });
+         }
 
-               var wrap = selection.selectAll('.form-field-input-wrap')
-                   .data([0]);
+         return function (selection) {
+           selection.append('li').attr('class', 'userLink').classed('hide', true);
+           selection.append('li').attr('class', 'logoutLink').classed('hide', true);
 
-               wrap = wrap.enter()
-                   .append('div')
-                   .attr('class', 'form-field-input-wrap form-field-input-' + field.type)
-                   .merge(wrap);
+           if (osm) {
+             osm.on('change.account', function () {
+               update(selection);
+             });
+             update(selection);
+           }
+         };
+       }
 
+       function uiAttribution(context) {
+         var _selection = select(null);
 
-               input = wrap.selectAll('input.maxspeed-number')
-                   .data([0]);
+         function render(selection, data, klass) {
+           var div = selection.selectAll(".".concat(klass)).data([0]);
+           div = div.enter().append('div').attr('class', klass).merge(div);
+           var attributions = div.selectAll('.attribution').data(data, function (d) {
+             return d.id;
+           });
+           attributions.exit().remove();
+           attributions = attributions.enter().append('span').attr('class', 'attribution').each(function (d, i, nodes) {
+             var attribution = select(nodes[i]);
 
-               input = input.enter()
-                   .append('input')
-                   .attr('type', 'text')
-                   .attr('class', 'maxspeed-number')
-                   .attr('id', field.domId)
-                   .call(utilNoAuto)
-                   .call(speedCombo)
-                   .merge(input);
+             if (d.terms_html) {
+               attribution.html(d.terms_html);
+               return;
+             }
 
-               input
-                   .on('change', change)
-                   .on('blur', change);
+             if (d.terms_url) {
+               attribution = attribution.append('a').attr('href', d.terms_url).attr('target', '_blank');
+             }
 
-               var loc = combinedEntityExtent().center();
-               _isImperial = roadSpeedUnit(loc) === 'mph';
+             var sourceID = d.id.replace(/\./g, '<TX_DOT>');
+             var terms_text = _t("imagery.".concat(sourceID, ".attribution.text"), {
+               "default": d.terms_text || d.id || d.name()
+             });
 
-               unitInput = wrap.selectAll('input.maxspeed-unit')
-                   .data([0]);
+             if (d.icon && !d.overlay) {
+               attribution.append('img').attr('class', 'source-image').attr('src', d.icon);
+             }
 
-               unitInput = unitInput.enter()
-                   .append('input')
-                   .attr('type', 'text')
-                   .attr('class', 'maxspeed-unit')
-                   .call(unitCombo)
-                   .merge(unitInput);
+             attribution.append('span').attr('class', 'attribution-text').html(terms_text);
+           }).merge(attributions);
+           var copyright = attributions.selectAll('.copyright-notice').data(function (d) {
+             var notice = d.copyrightNotices(context.map().zoom(), context.map().extent());
+             return notice ? [notice] : [];
+           });
+           copyright.exit().remove();
+           copyright = copyright.enter().append('span').attr('class', 'copyright-notice').merge(copyright);
+           copyright.html(String);
+         }
 
-               unitInput
-                   .on('blur', changeUnits)
-                   .on('change', changeUnits);
+         function update() {
+           var baselayer = context.background().baseLayerSource();
 
+           _selection.call(render, baselayer ? [baselayer] : [], 'base-layer-attribution');
 
-               function changeUnits() {
-                   _isImperial = utilGetSetValue(unitInput) === 'mph';
-                   utilGetSetValue(unitInput, _isImperial ? 'mph' : 'km/h');
-                   setUnitSuggestions();
-                   change();
-               }
-           }
+           var z = context.map().zoom();
+           var overlays = context.background().overlayLayerSources() || [];
 
+           _selection.call(render, overlays.filter(function (s) {
+             return s.validZoom(z);
+           }), 'overlay-layer-attribution');
+         }
 
-           function setUnitSuggestions() {
-               speedCombo.data((_isImperial ? imperialValues : metricValues).map(comboValues));
-               utilGetSetValue(unitInput, _isImperial ? 'mph' : 'km/h');
-           }
+         return function (selection) {
+           _selection = selection;
+           context.background().on('change.attribution', update);
+           context.map().on('move.attribution', throttle(update, 400, {
+             leading: false
+           }));
+           update();
+         };
+       }
 
+       function uiContributors(context) {
+         var osm = context.connection(),
+             debouncedUpdate = debounce(function () {
+           update();
+         }, 1000),
+             limit = 4,
+             hidden = false,
+             wrap = select(null);
 
-           function comboValues(d) {
-               return {
-                   value: d.toString(),
-                   title: d.toString()
-               };
+         function update() {
+           if (!osm) return;
+           var users = {},
+               entities = context.history().intersects(context.map().extent());
+           entities.forEach(function (entity) {
+             if (entity && entity.user) users[entity.user] = true;
+           });
+           var u = Object.keys(users),
+               subset = u.slice(0, u.length > limit ? limit - 1 : limit);
+           wrap.html('').call(svgIcon('#iD-icon-nearby', 'pre-text light'));
+           var userList = select(document.createElement('span'));
+           userList.selectAll().data(subset).enter().append('a').attr('class', 'user-link').attr('href', function (d) {
+             return osm.userURL(d);
+           }).attr('target', '_blank').html(String);
+
+           if (u.length > limit) {
+             var count = select(document.createElement('span'));
+             var othersNum = u.length - limit + 1;
+             count.append('a').attr('target', '_blank').attr('href', function () {
+               return osm.changesetsURL(context.map().center(), context.map().zoom());
+             }).html(othersNum);
+             wrap.append('span').html(_t.html('contributors.truncated_list', {
+               n: othersNum,
+               users: userList.html(),
+               count: count.html()
+             }));
+           } else {
+             wrap.append('span').html(_t.html('contributors.list', {
+               users: userList.html()
+             }));
            }
 
+           if (!u.length) {
+             hidden = true;
+             wrap.transition().style('opacity', 0);
+           } else if (hidden) {
+             wrap.transition().style('opacity', 1);
+           }
+         }
 
-           function change() {
-               var tag = {};
-               var value = utilGetSetValue(input).trim();
+         return function (selection) {
+           if (!osm) return;
+           wrap = selection;
+           update();
+           osm.on('loaded.contributors', debouncedUpdate);
+           context.map().on('move.contributors', debouncedUpdate);
+         };
+       }
 
-               // don't override multiple values with blank string
-               if (!value && Array.isArray(_tags[field.key])) return;
+       var _popoverID = 0;
+       function uiPopover(klass) {
+         var _id = _popoverID++;
 
-               if (!value) {
-                   tag[field.key] = undefined;
-               } else if (isNaN(value) || !_isImperial) {
-                   tag[field.key] = context.cleanTagValue(value);
-               } else {
-                   tag[field.key] = context.cleanTagValue(value + ' mph');
-               }
+         var _anchorSelection = select(null);
 
-               dispatch$1.call('change', this, tag);
-           }
+         var popover = function popover(selection) {
+           _anchorSelection = selection;
+           selection.each(setup);
+         };
 
+         var _animation = utilFunctor(false);
 
-           maxspeed.tags = function(tags) {
-               _tags = tags;
+         var _placement = utilFunctor('top'); // top, bottom, left, right
 
-               var value = tags[field.key];
-               var isMixed = Array.isArray(value);
 
-               if (!isMixed) {
-                   if (value && value.indexOf('mph') >= 0) {
-                       value = parseInt(value, 10).toString();
-                       _isImperial = true;
-                   } else if (value) {
-                       _isImperial = false;
-                   }
-               }
+         var _alignment = utilFunctor('center'); // leading, center, trailing
 
-               setUnitSuggestions();
 
-               utilGetSetValue(input, typeof value === 'string' ? value : '')
-                   .attr('title', isMixed ? value.filter(Boolean).join('\n') : null)
-                   .attr('placeholder', isMixed ? _t('inspector.multiple_values') : field.placeholder())
-                   .classed('mixed', isMixed);
-           };
+         var _scrollContainer = utilFunctor(select(null));
 
+         var _content;
 
-           maxspeed.focus = function() {
-               input.node().focus();
-           };
+         var _displayType = utilFunctor('');
 
+         var _hasArrow = utilFunctor(true); // use pointer events on supported platforms; fallback to mouse events
 
-           maxspeed.entityIDs = function(val) {
-               _entityIDs = val;
-           };
 
+         var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
 
-           function combinedEntityExtent() {
-               return _entityIDs && _entityIDs.length && utilTotalExtent(_entityIDs, context.graph());
+         popover.displayType = function (val) {
+           if (arguments.length) {
+             _displayType = utilFunctor(val);
+             return popover;
+           } else {
+             return _displayType;
            }
+         };
 
+         popover.hasArrow = function (val) {
+           if (arguments.length) {
+             _hasArrow = utilFunctor(val);
+             return popover;
+           } else {
+             return _hasArrow;
+           }
+         };
 
-           return utilRebind(maxspeed, dispatch$1, 'on');
-       }
-
-       function uiFieldRadio(field, context) {
-           var dispatch$1 = dispatch('change');
-           var placeholder = select(null);
-           var wrap = select(null);
-           var labels = select(null);
-           var radios = select(null);
-           var radioData = (field.options || (field.strings && field.strings.options && Object.keys(field.strings.options)) || field.keys).slice();  // shallow copy
-           var typeField;
-           var layerField;
-           var _oldType = {};
-           var _entityIDs = [];
-
-
-           function selectedKey() {
-               var node = wrap.selectAll('.form-field-input-radio label.active input');
-               return !node.empty() && node.datum();
+         popover.placement = function (val) {
+           if (arguments.length) {
+             _placement = utilFunctor(val);
+             return popover;
+           } else {
+             return _placement;
            }
+         };
 
+         popover.alignment = function (val) {
+           if (arguments.length) {
+             _alignment = utilFunctor(val);
+             return popover;
+           } else {
+             return _alignment;
+           }
+         };
 
-           function radio(selection) {
-               selection.classed('preset-radio', true);
+         popover.scrollContainer = function (val) {
+           if (arguments.length) {
+             _scrollContainer = utilFunctor(val);
+             return popover;
+           } else {
+             return _scrollContainer;
+           }
+         };
 
-               wrap = selection.selectAll('.form-field-input-wrap')
-                   .data([0]);
+         popover.content = function (val) {
+           if (arguments.length) {
+             _content = val;
+             return popover;
+           } else {
+             return _content;
+           }
+         };
 
-               var enter = wrap.enter()
-                   .append('div')
-                   .attr('class', 'form-field-input-wrap form-field-input-radio');
+         popover.isShown = function () {
+           var popoverSelection = _anchorSelection.select('.popover-' + _id);
 
-               enter
-                   .append('span')
-                   .attr('class', 'placeholder');
+           return !popoverSelection.empty() && popoverSelection.classed('in');
+         };
 
-               wrap = wrap
-                   .merge(enter);
+         popover.show = function () {
+           _anchorSelection.each(show);
+         };
 
+         popover.updateContent = function () {
+           _anchorSelection.each(updateContent);
+         };
 
-               placeholder = wrap.selectAll('.placeholder');
+         popover.hide = function () {
+           _anchorSelection.each(hide);
+         };
 
-               labels = wrap.selectAll('label')
-                   .data(radioData);
+         popover.toggle = function () {
+           _anchorSelection.each(toggle);
+         };
 
-               enter = labels.enter()
-                   .append('label');
+         popover.destroy = function (selection, selector) {
+           // by default, just destroy the current popover
+           selector = selector || '.popover-' + _id;
+           selection.on(_pointerPrefix + 'enter.popover', null).on(_pointerPrefix + 'leave.popover', null).on(_pointerPrefix + 'up.popover', null).on(_pointerPrefix + 'down.popover', null).on('click.popover', null).attr('title', function () {
+             return this.getAttribute('data-original-title') || this.getAttribute('title');
+           }).attr('data-original-title', null).selectAll(selector).remove();
+         };
 
-               enter
-                   .append('input')
-                   .attr('type', 'radio')
-                   .attr('name', field.id)
-                   .attr('value', function(d) { return field.t('options.' + d, { 'default': d }); })
-                   .attr('checked', false);
+         popover.destroyAny = function (selection) {
+           selection.call(popover.destroy, '.popover');
+         };
 
-               enter
-                   .append('span')
-                   .text(function(d) { return field.t('options.' + d, { 'default': d }); });
+         function setup() {
+           var anchor = select(this);
 
-               labels = labels
-                   .merge(enter);
+           var animate = _animation.apply(this, arguments);
 
-               radios = labels.selectAll('input')
-                   .on('change', changeRadio);
+           var popoverSelection = anchor.selectAll('.popover-' + _id).data([0]);
+           var enter = popoverSelection.enter().append('div').attr('class', 'popover popover-' + _id + ' ' + (klass ? klass : '')).classed('arrowed', _hasArrow.apply(this, arguments));
+           enter.append('div').attr('class', 'popover-arrow');
+           enter.append('div').attr('class', 'popover-inner');
+           popoverSelection = enter.merge(popoverSelection);
 
+           if (animate) {
+             popoverSelection.classed('fade', true);
            }
 
+           var display = _displayType.apply(this, arguments);
 
-           function structureExtras(selection, tags) {
-               var selected = selectedKey() || tags.layer !== undefined;
-               var type = _mainPresetIndex.field(selected);
-               var layer = _mainPresetIndex.field('layer');
-               var showLayer = (selected === 'bridge' || selected === 'tunnel' || tags.layer !== undefined);
-
-
-               var extrasWrap = selection.selectAll('.structure-extras-wrap')
-                   .data(selected ? [0] : []);
-
-               extrasWrap.exit()
-                   .remove();
+           if (display === 'hover') {
+             var _lastNonMouseEnterTime;
 
-               extrasWrap = extrasWrap.enter()
-                   .append('div')
-                   .attr('class', 'structure-extras-wrap')
-                   .merge(extrasWrap);
-
-               var list = extrasWrap.selectAll('ul')
-                   .data([0]);
+             anchor.on(_pointerPrefix + 'enter.popover', function (d3_event) {
+               if (d3_event.pointerType) {
+                 if (d3_event.pointerType !== 'mouse') {
+                   _lastNonMouseEnterTime = d3_event.timeStamp; // only allow hover behavior for mouse input
 
-               list = list.enter()
-                   .append('ul')
-                   .attr('class', 'rows')
-                   .merge(list);
+                   return;
+                 } else if (_lastNonMouseEnterTime && d3_event.timeStamp - _lastNonMouseEnterTime < 1500) {
+                   // HACK: iOS 13.4 sends an erroneous `mouse` type pointerenter
+                   // event for non-mouse interactions right after sending
+                   // the correct type pointerenter event. Workaround by discarding
+                   // any mouse event that occurs immediately after a non-mouse event.
+                   return;
+                 }
+               } // don't show if buttons are pressed, e.g. during click and drag of map
+
+
+               if (d3_event.buttons !== 0) return;
+               show.apply(this, arguments);
+             }).on(_pointerPrefix + 'leave.popover', function () {
+               hide.apply(this, arguments);
+             }) // show on focus too for better keyboard navigation support
+             .on('focus.popover', function () {
+               show.apply(this, arguments);
+             }).on('blur.popover', function () {
+               hide.apply(this, arguments);
+             });
+           } else if (display === 'clickFocus') {
+             anchor.on(_pointerPrefix + 'down.popover', function (d3_event) {
+               d3_event.preventDefault();
+               d3_event.stopPropagation();
+             }).on(_pointerPrefix + 'up.popover', function (d3_event) {
+               d3_event.preventDefault();
+               d3_event.stopPropagation();
+             }).on('click.popover', toggle);
+             popoverSelection // This attribute lets the popover take focus
+             .attr('tabindex', 0).on('blur.popover', function () {
+               anchor.each(function () {
+                 hide.apply(this, arguments);
+               });
+             });
+           }
+         }
 
+         function show() {
+           var anchor = select(this);
+           var popoverSelection = anchor.selectAll('.popover-' + _id);
 
-               // Type
-               if (type) {
-                   if (!typeField || typeField.id !== selected) {
-                       typeField = uiField(context, type, _entityIDs, { wrap: false })
-                           .on('change', changeType);
-                   }
-                   typeField.tags(tags);
-               } else {
-                   typeField = null;
-               }
+           if (popoverSelection.empty()) {
+             // popover was removed somehow, put it back
+             anchor.call(popover.destroy);
+             anchor.each(setup);
+             popoverSelection = anchor.selectAll('.popover-' + _id);
+           }
 
-               var typeItem = list.selectAll('.structure-type-item')
-                   .data(typeField ? [typeField] : [], function(d) { return d.id; });
+           popoverSelection.classed('in', true);
 
-               // Exit
-               typeItem.exit()
-                   .remove();
+           var displayType = _displayType.apply(this, arguments);
 
-               // Enter
-               var typeEnter = typeItem.enter()
-                   .insert('li', ':first-child')
-                   .attr('class', 'labeled-input structure-type-item');
+           if (displayType === 'clickFocus') {
+             anchor.classed('active', true);
+             popoverSelection.node().focus();
+           }
 
-               typeEnter
-                   .append('span')
-                   .attr('class', 'label structure-label-type')
-                   .attr('for', 'preset-input-' + selected)
-                   .text(_t('inspector.radio.structure.type'));
+           anchor.each(updateContent);
+         }
 
-               typeEnter
-                   .append('div')
-                   .attr('class', 'structure-input-type-wrap');
+         function updateContent() {
+           var anchor = select(this);
 
-               // Update
-               typeItem = typeItem
-                   .merge(typeEnter);
+           if (_content) {
+             anchor.selectAll('.popover-' + _id + ' > .popover-inner').call(_content.apply(this, arguments));
+           }
 
-               if (typeField) {
-                   typeItem.selectAll('.structure-input-type-wrap')
-                       .call(typeField.render);
-               }
+           updatePosition.apply(this, arguments); // hack: update multiple times to fix instances where the absolute offset is
+           // set before the dynamic popover size is calculated by the browser
 
+           updatePosition.apply(this, arguments);
+           updatePosition.apply(this, arguments);
+         }
 
-               // Layer
-               if (layer && showLayer) {
-                   if (!layerField) {
-                       layerField = uiField(context, layer, _entityIDs, { wrap: false })
-                           .on('change', changeLayer);
-                   }
-                   layerField.tags(tags);
-                   field.keys = utilArrayUnion(field.keys, ['layer']);
-               } else {
-                   layerField = null;
-                   field.keys = field.keys.filter(function(k) { return k !== 'layer'; });
-               }
+         function updatePosition() {
+           var anchor = select(this);
+           var popoverSelection = anchor.selectAll('.popover-' + _id);
 
-               var layerItem = list.selectAll('.structure-layer-item')
-                   .data(layerField ? [layerField] : []);
+           var scrollContainer = _scrollContainer && _scrollContainer.apply(this, arguments);
 
-               // Exit
-               layerItem.exit()
-                   .remove();
+           var scrollNode = scrollContainer && !scrollContainer.empty() && scrollContainer.node();
+           var scrollLeft = scrollNode ? scrollNode.scrollLeft : 0;
+           var scrollTop = scrollNode ? scrollNode.scrollTop : 0;
 
-               // Enter
-               var layerEnter = layerItem.enter()
-                   .append('li')
-                   .attr('class', 'labeled-input structure-layer-item');
+           var placement = _placement.apply(this, arguments);
 
-               layerEnter
-                   .append('span')
-                   .attr('class', 'label structure-label-layer')
-                   .attr('for', 'preset-input-layer')
-                   .text(_t('inspector.radio.structure.layer'));
+           popoverSelection.classed('left', false).classed('right', false).classed('top', false).classed('bottom', false).classed(placement, true);
 
-               layerEnter
-                   .append('div')
-                   .attr('class', 'structure-input-layer-wrap');
+           var alignment = _alignment.apply(this, arguments);
 
-               // Update
-               layerItem = layerItem
-                   .merge(layerEnter);
+           var alignFactor = 0.5;
 
-               if (layerField) {
-                   layerItem.selectAll('.structure-input-layer-wrap')
-                       .call(layerField.render);
-               }
+           if (alignment === 'leading') {
+             alignFactor = 0;
+           } else if (alignment === 'trailing') {
+             alignFactor = 1;
            }
 
+           var anchorFrame = getFrame(anchor.node());
+           var popoverFrame = getFrame(popoverSelection.node());
+           var position;
 
-           function changeType(t, onInput) {
-               var key = selectedKey();
-               if (!key) return;
+           switch (placement) {
+             case 'top':
+               position = {
+                 x: anchorFrame.x + (anchorFrame.w - popoverFrame.w) * alignFactor,
+                 y: anchorFrame.y - popoverFrame.h
+               };
+               break;
 
-               var val = t[key];
-               if (val !== 'no') {
-                   _oldType[key] = val;
-               }
+             case 'bottom':
+               position = {
+                 x: anchorFrame.x + (anchorFrame.w - popoverFrame.w) * alignFactor,
+                 y: anchorFrame.y + anchorFrame.h
+               };
+               break;
 
-               if (field.type === 'structureRadio') {
-                   // remove layer if it should not be set
-                   if (val === 'no' ||
-                       (key !== 'bridge' && key !== 'tunnel') ||
-                       (key === 'tunnel' && val === 'building_passage')) {
-                       t.layer = undefined;
-                   }
-                   // add layer if it should be set
-                   if (t.layer === undefined) {
-                       if (key === 'bridge' && val !== 'no') {
-                           t.layer = '1';
-                       }
-                       if (key === 'tunnel' && val !== 'no' && val !== 'building_passage') {
-                           t.layer = '-1';
-                       }
-                   }
-                }
+             case 'left':
+               position = {
+                 x: anchorFrame.x - popoverFrame.w,
+                 y: anchorFrame.y + (anchorFrame.h - popoverFrame.h) * alignFactor
+               };
+               break;
 
-               dispatch$1.call('change', this, t, onInput);
+             case 'right':
+               position = {
+                 x: anchorFrame.x + anchorFrame.w,
+                 y: anchorFrame.y + (anchorFrame.h - popoverFrame.h) * alignFactor
+               };
+               break;
            }
 
+           if (position) {
+             if (scrollNode && (placement === 'top' || placement === 'bottom')) {
+               var initialPosX = position.x;
 
-           function changeLayer(t, onInput) {
-               if (t.layer === '0') {
-                   t.layer = undefined;
+               if (position.x + popoverFrame.w > scrollNode.offsetWidth - 10) {
+                 position.x = scrollNode.offsetWidth - 10 - popoverFrame.w;
+               } else if (position.x < 10) {
+                 position.x = 10;
                }
-               dispatch$1.call('change', this, t, onInput);
-           }
 
+               var arrow = anchor.selectAll('.popover-' + _id + ' > .popover-arrow'); // keep the arrow centered on the button, or as close as possible
 
-           function changeRadio() {
-               var t = {};
-               var activeKey;
+               var arrowPosX = Math.min(Math.max(popoverFrame.w / 2 - (position.x - initialPosX), 10), popoverFrame.w - 10);
+               arrow.style('left', ~~arrowPosX + 'px');
+             }
 
-               if (field.key) {
-                   t[field.key] = undefined;
-               }
+             popoverSelection.style('left', ~~position.x + 'px').style('top', ~~position.y + 'px');
+           } else {
+             popoverSelection.style('left', null).style('top', null);
+           }
 
-               radios.each(function(d) {
-                   var active = select(this).property('checked');
-                   if (active) activeKey = d;
+           function getFrame(node) {
+             var positionStyle = select(node).style('position');
 
-                   if (field.key) {
-                       if (active) t[field.key] = d;
-                   } else {
-                       var val = _oldType[activeKey] || 'yes';
-                       t[d] = active ? val : undefined;
-                   }
-               });
+             if (positionStyle === 'absolute' || positionStyle === 'static') {
+               return {
+                 x: node.offsetLeft - scrollLeft,
+                 y: node.offsetTop - scrollTop,
+                 w: node.offsetWidth,
+                 h: node.offsetHeight
+               };
+             } else {
+               return {
+                 x: 0,
+                 y: 0,
+                 w: node.offsetWidth,
+                 h: node.offsetHeight
+               };
+             }
+           }
+         }
 
-               if (field.type === 'structureRadio') {
-                   if (activeKey === 'bridge') {
-                       t.layer = '1';
-                   } else if (activeKey === 'tunnel' && t.tunnel !== 'building_passage') {
-                       t.layer = '-1';
-                   } else {
-                       t.layer = undefined;
-                   }
-               }
+         function hide() {
+           var anchor = select(this);
 
-               dispatch$1.call('change', this, t);
+           if (_displayType.apply(this, arguments) === 'clickFocus') {
+             anchor.classed('active', false);
            }
 
+           anchor.selectAll('.popover-' + _id).classed('in', false);
+         }
 
-           radio.tags = function(tags) {
+         function toggle() {
+           if (select(this).select('.popover-' + _id).classed('in')) {
+             hide.apply(this, arguments);
+           } else {
+             show.apply(this, arguments);
+           }
+         }
 
-               radios.property('checked', function(d) {
-                   if (field.key) {
-                       return tags[field.key] === d;
-                   }
-                   return !!(typeof tags[d] === 'string' && tags[d].toLowerCase() !== 'no');
-               });
+         return popover;
+       }
 
-               function isMixed(d) {
-                   if (field.key) {
-                       return Array.isArray(tags[field.key]) && tags[field.key].includes(d);
-                   }
-                   return Array.isArray(tags[d]);
-               }
+       function uiTooltip(klass) {
+         var tooltip = uiPopover((klass || '') + ' tooltip').displayType('hover');
 
-               labels
-                   .classed('active', function(d) {
-                       if (field.key) {
-                           return (Array.isArray(tags[field.key]) && tags[field.key].includes(d))
-                               || tags[field.key] === d;
-                       }
-                       return Array.isArray(tags[d]) || !!(tags[d] && tags[d].toLowerCase() !== 'no');
-                   })
-                   .classed('mixed', isMixed)
-                   .attr('title', function(d) {
-                       return isMixed(d) ? _t('inspector.unshared_value_tooltip') : null;
-                   });
+         var _title = function _title() {
+           var title = this.getAttribute('data-original-title');
 
+           if (title) {
+             return title;
+           } else {
+             title = this.getAttribute('title');
+             this.removeAttribute('title');
+             this.setAttribute('data-original-title', title);
+           }
 
-               var selection = radios.filter(function() { return this.checked; });
+           return title;
+         };
 
-               if (selection.empty()) {
-                   placeholder.text(_t('inspector.none'));
-               } else {
-                   placeholder.text(selection.attr('value'));
-                   _oldType[selection.datum()] = tags[selection.datum()];
-               }
+         var _heading = utilFunctor(null);
 
-               if (field.type === 'structureRadio') {
-                   // For waterways without a tunnel tag, set 'culvert' as
-                   // the _oldType to default to if the user picks 'tunnel'
-                   if (!!tags.waterway && !_oldType.tunnel) {
-                       _oldType.tunnel = 'culvert';
-                   }
+         var _keys = utilFunctor(null);
 
-                   wrap.call(structureExtras, tags);
-               }
-           };
+         tooltip.title = function (val) {
+           if (!arguments.length) return _title;
+           _title = utilFunctor(val);
+           return tooltip;
+         };
 
+         tooltip.heading = function (val) {
+           if (!arguments.length) return _heading;
+           _heading = utilFunctor(val);
+           return tooltip;
+         };
 
-           radio.focus = function() {
-               radios.node().focus();
-           };
+         tooltip.keys = function (val) {
+           if (!arguments.length) return _keys;
+           _keys = utilFunctor(val);
+           return tooltip;
+         };
 
+         tooltip.content(function () {
+           var heading = _heading.apply(this, arguments);
 
-           radio.entityIDs = function(val) {
-               if (!arguments.length) return _entityIDs;
-               _entityIDs = val;
-               _oldType = {};
-               return radio;
-           };
+           var text = _title.apply(this, arguments);
 
+           var keys = _keys.apply(this, arguments);
 
-           radio.isAllowed = function() {
-               return _entityIDs.length === 1;
+           return function (selection) {
+             var headingSelect = selection.selectAll('.tooltip-heading').data(heading ? [heading] : []);
+             headingSelect.exit().remove();
+             headingSelect.enter().append('div').attr('class', 'tooltip-heading').merge(headingSelect).html(heading);
+             var textSelect = selection.selectAll('.tooltip-text').data(text ? [text] : []);
+             textSelect.exit().remove();
+             textSelect.enter().append('div').attr('class', 'tooltip-text').merge(textSelect).html(text);
+             var keyhintWrap = selection.selectAll('.keyhint-wrap').data(keys && keys.length ? [0] : []);
+             keyhintWrap.exit().remove();
+             var keyhintWrapEnter = keyhintWrap.enter().append('div').attr('class', 'keyhint-wrap');
+             keyhintWrapEnter.append('span').html(_t.html('tooltip_keyhint'));
+             keyhintWrap = keyhintWrapEnter.merge(keyhintWrap);
+             keyhintWrap.selectAll('kbd.shortcut').data(keys && keys.length ? keys : []).enter().append('kbd').attr('class', 'shortcut').html(function (d) {
+               return d;
+             });
            };
-
-
-           return utilRebind(radio, dispatch$1, 'on');
+         });
+         return tooltip;
        }
 
-       function uiFieldRestrictions(field, context) {
-           var dispatch$1 = dispatch('change');
-           var breathe = behaviorBreathe();
-
-           corePreferences('turn-restriction-via-way', null);                 // remove old key
-           var storedViaWay = corePreferences('turn-restriction-via-way0');   // use new key #6922
-           var storedDistance = corePreferences('turn-restriction-distance');
-
-           var _maxViaWay = storedViaWay !== null ? (+storedViaWay) : 0;
-           var _maxDistance = storedDistance ? (+storedDistance) : 30;
-           var _initialized = false;
-           var _parent = select(null);       // the entire field
-           var _container = select(null);    // just the map
-           var _oldTurns;
-           var _graph;
-           var _vertexID;
-           var _intersection;
-           var _fromWayID;
-
-           var _lastXPos;
-
-
-           function restrictions(selection) {
-               _parent = selection;
-
-               // try to reuse the intersection, but always rebuild it if the graph has changed
-               if (_vertexID && (context.graph() !== _graph || !_intersection)) {
-                   _graph = context.graph();
-                   _intersection = osmIntersection(_graph, _vertexID, _maxDistance);
-               }
-
-               // It's possible for there to be no actual intersection here.
-               // for example, a vertex of two `highway=path`
-               // In this case, hide the field.
-               var isOK = (
-                   _intersection &&
-                   _intersection.vertices.length &&           // has vertices
-                   _intersection.vertices                     // has the vertex that the user selected
-                       .filter(function(vertex) { return vertex.id === _vertexID; }).length &&
-                   _intersection.ways.length > 2 &&           // has more than 2 ways
-                   _intersection.ways                         // has more than 1 TO way
-                       .filter(function(way) { return way.__to; }).length > 1
-               );
-
-               // Also hide in the case where
-               select(selection.node().parentNode).classed('hide', !isOK);
-
-               // if form field is hidden or has detached from dom, clean up.
-               if (!isOK ||
-                   !context.container().select('.inspector-wrap.inspector-hidden').empty() ||
-                   !selection.node().parentNode ||
-                   !selection.node().parentNode.parentNode) {
-                   selection.call(restrictions.off);
-                   return;
-               }
+       function uiEditMenu(context) {
+         var dispatch$1 = dispatch('toggled');
 
+         var _menu = select(null);
 
-               var wrap = selection.selectAll('.form-field-input-wrap')
-                   .data([0]);
+         var _operations = []; // the position the menu should be displayed relative to
 
-               wrap = wrap.enter()
-                   .append('div')
-                   .attr('class', 'form-field-input-wrap form-field-input-' + field.type)
-                   .merge(wrap);
+         var _anchorLoc = [0, 0];
+         var _anchorLocLonLat = [0, 0]; // a string indicating how the menu was opened
 
-               var container = wrap.selectAll('.restriction-container')
-                   .data([0]);
+         var _triggerType = '';
+         var _vpTopMargin = 85; // viewport top margin
 
-               // enter
-               var containerEnter = container.enter()
-                   .append('div')
-                   .attr('class', 'restriction-container');
+         var _vpBottomMargin = 45; // viewport bottom margin
 
-               containerEnter
-                   .append('div')
-                   .attr('class', 'restriction-help');
+         var _vpSideMargin = 35; // viewport side margin
 
-               // update
-               _container = containerEnter
-                   .merge(container)
-                   .call(renderViewer);
+         var _menuTop = false;
 
-               var controls = wrap.selectAll('.restriction-controls')
-                   .data([0]);
+         var _menuHeight;
 
-               // enter/update
-               controls.enter()
-                   .append('div')
-                   .attr('class', 'restriction-controls-container')
-                   .append('div')
-                   .attr('class', 'restriction-controls')
-                   .merge(controls)
-                   .call(renderControls);
-           }
+         var _menuWidth; // hardcode these values to make menu positioning easier
 
 
-           function renderControls(selection) {
-               var distControl = selection.selectAll('.restriction-distance')
-                   .data([0]);
+         var _verticalPadding = 4; // see also `.edit-menu .tooltip` CSS; include margin
 
-               distControl.exit()
-                   .remove();
+         var _tooltipWidth = 210; // offset the menu slightly from the target location
 
-               var distControlEnter = distControl.enter()
-                   .append('div')
-                   .attr('class', 'restriction-control restriction-distance');
-
-               distControlEnter
-                   .append('span')
-                   .attr('class', 'restriction-control-label restriction-distance-label')
-                   .text(_t('restriction.controls.distance') + ':');
-
-               distControlEnter
-                   .append('input')
-                   .attr('class', 'restriction-distance-input')
-                   .attr('type', 'range')
-                   .attr('min', '20')
-                   .attr('max', '50')
-                   .attr('step', '5');
-
-               distControlEnter
-                   .append('span')
-                   .attr('class', 'restriction-distance-text');
-
-               // update
-               selection.selectAll('.restriction-distance-input')
-                   .property('value', _maxDistance)
-                   .on('input', function() {
-                       var val = select(this).property('value');
-                       _maxDistance = +val;
-                       _intersection = null;
-                       _container.selectAll('.layer-osm .layer-turns *').remove();
-                       corePreferences('turn-restriction-distance', _maxDistance);
-                       _parent.call(restrictions);
-                   });
+         var _menuSideMargin = 10;
+         var _tooltips = [];
 
-               selection.selectAll('.restriction-distance-text')
-                   .text(displayMaxDistance(_maxDistance));
+         var editMenu = function editMenu(selection) {
+           var isTouchMenu = _triggerType.includes('touch') || _triggerType.includes('pen');
 
+           var ops = _operations.filter(function (op) {
+             return !isTouchMenu || !op.mouseOnly;
+           });
 
-               var viaControl = selection.selectAll('.restriction-via-way')
-                   .data([0]);
+           if (!ops.length) return;
+           _tooltips = []; // Position the menu above the anchor for stylus and finger input
+           // since the mapper's hand likely obscures the screen below the anchor
 
-               viaControl.exit()
-                   .remove();
+           _menuTop = isTouchMenu; // Show labels for touch input since there aren't hover tooltips
 
-               var viaControlEnter = viaControl.enter()
-                   .append('div')
-                   .attr('class', 'restriction-control restriction-via-way');
-
-               viaControlEnter
-                   .append('span')
-                   .attr('class', 'restriction-control-label restriction-via-way-label')
-                   .text(_t('restriction.controls.via') + ':');
-
-               viaControlEnter
-                   .append('input')
-                   .attr('class', 'restriction-via-way-input')
-                   .attr('type', 'range')
-                   .attr('min', '0')
-                   .attr('max', '2')
-                   .attr('step', '1');
-
-               viaControlEnter
-                   .append('span')
-                   .attr('class', 'restriction-via-way-text');
-
-               // update
-               selection.selectAll('.restriction-via-way-input')
-                   .property('value', _maxViaWay)
-                   .on('input', function() {
-                       var val = select(this).property('value');
-                       _maxViaWay = +val;
-                       _container.selectAll('.layer-osm .layer-turns *').remove();
-                       corePreferences('turn-restriction-via-way0', _maxViaWay);
-                       _parent.call(restrictions);
-                   });
+           var showLabels = isTouchMenu;
+           var buttonHeight = showLabels ? 32 : 34;
 
-               selection.selectAll('.restriction-via-way-text')
-                   .text(displayMaxVia(_maxViaWay));
+           if (showLabels) {
+             // Get a general idea of the width based on the length of the label
+             _menuWidth = 52 + Math.min(120, 6 * Math.max.apply(Math, ops.map(function (op) {
+               return op.title.length;
+             })));
+           } else {
+             _menuWidth = 44;
            }
 
+           _menuHeight = _verticalPadding * 2 + ops.length * buttonHeight;
+           _menu = selection.append('div').attr('class', 'edit-menu').classed('touch-menu', isTouchMenu).style('padding', _verticalPadding + 'px 0');
 
-           function renderViewer(selection) {
-               if (!_intersection) return;
+           var buttons = _menu.selectAll('.edit-menu-item').data(ops); // enter
 
-               var vgraph = _intersection.graph;
-               var filter = utilFunctor(true);
-               var projection = geoRawMercator();
 
-               // Reflow warning: `utilGetDimensions` calls `getBoundingClientRect`
-               // Instead of asking the restriction-container for its dimensions,
-               //  we can ask the .sidebar, which can have its dimensions cached.
-               // width: calc as sidebar - padding
-               // height: hardcoded (from `80_app.css`)
-               // var d = utilGetDimensions(selection);
-               var sdims = utilGetDimensions(context.container().select('.sidebar'));
-               var d = [ sdims[0] - 50, 370 ];
-               var c = geoVecScale(d, 0.5);
-               var z = 22;
-
-               projection.scale(geoZoomToScale(z));
-
-               // Calculate extent of all key vertices
-               var extent = geoExtent();
-               for (var i = 0; i < _intersection.vertices.length; i++) {
-                   extent._extend(_intersection.vertices[i].extent());
-               }
+           var buttonsEnter = buttons.enter().append('button').attr('class', function (d) {
+             return 'edit-menu-item edit-menu-item-' + d.id;
+           }).style('height', buttonHeight + 'px').on('click', click) // don't listen for `mouseup` because we only care about non-mouse pointer types
+           .on('pointerup', pointerup).on('pointerdown mousedown', function pointerdown(d3_event) {
+             // don't let button presses also act as map input - #1869
+             d3_event.stopPropagation();
+           }).on('mouseenter.highlight', function (d3_event, d) {
+             if (!d.relatedEntityIds || select(this).classed('disabled')) return;
+             utilHighlightEntities(d.relatedEntityIds(), true, context);
+           }).on('mouseleave.highlight', function (d3_event, d) {
+             if (!d.relatedEntityIds) return;
+             utilHighlightEntities(d.relatedEntityIds(), false, context);
+           });
+           buttonsEnter.each(function (d) {
+             var tooltip = uiTooltip().heading(d.title).title(d.tooltip()).keys([d.keys[0]]);
 
-               // If this is a large intersection, adjust zoom to fit extent
-               if (_intersection.vertices.length > 1) {
-                   var padding = 180;   // in z22 pixels
-                   var tl = projection([extent[0][0], extent[1][1]]);
-                   var br = projection([extent[1][0], extent[0][1]]);
-                   var hFactor = (br[0] - tl[0]) / (d[0] - padding);
-                   var vFactor = (br[1] - tl[1]) / (d[1] - padding);
-                   var hZoomDiff = Math.log(Math.abs(hFactor)) / Math.LN2;
-                   var vZoomDiff = Math.log(Math.abs(vFactor)) / Math.LN2;
-                   z = z - Math.max(hZoomDiff, vZoomDiff);
-                   projection.scale(geoZoomToScale(z));
-               }
+             _tooltips.push(tooltip);
 
-               var padTop = 35;   // reserve top space for hint text
-               var extentCenter = projection(extent.center());
-               extentCenter[1] = extentCenter[1] - padTop;
+             select(this).call(tooltip).append('div').attr('class', 'icon-wrap').call(svgIcon('#iD-operation-' + d.id, 'operation'));
+           });
 
-               projection
-                   .translate(geoVecSubtract(c, extentCenter))
-                   .clipExtent([[0, 0], d]);
+           if (showLabels) {
+             buttonsEnter.append('span').attr('class', 'label').html(function (d) {
+               return d.title;
+             });
+           } // update
 
-               var drawLayers = svgLayers(projection, context).only(['osm','touch']).dimensions(d);
-               var drawVertices = svgVertices(projection, context);
-               var drawLines = svgLines(projection, context);
-               var drawTurns = svgTurns(projection, context);
 
-               var firstTime = selection.selectAll('.surface').empty();
+           buttonsEnter.merge(buttons).classed('disabled', function (d) {
+             return d.disabled();
+           });
+           updatePosition();
+           var initialScale = context.projection.scale();
+           context.map().on('move.edit-menu', function () {
+             if (initialScale !== context.projection.scale()) {
+               editMenu.close();
+             }
+           }).on('drawn.edit-menu', function (info) {
+             if (info.full) updatePosition();
+           });
+           var lastPointerUpType; // `pointerup` is always called before `click`
 
-               selection
-                   .call(drawLayers);
+           function pointerup(d3_event) {
+             lastPointerUpType = d3_event.pointerType;
+           }
 
-               var surface = selection.selectAll('.surface')
-                   .classed('tr', true);
+           function click(d3_event, operation) {
+             d3_event.stopPropagation();
 
-               if (firstTime) {
-                   _initialized = true;
+             if (operation.relatedEntityIds) {
+               utilHighlightEntities(operation.relatedEntityIds(), false, context);
+             }
 
-                   surface
-                       .call(breathe);
+             if (operation.disabled()) {
+               if (lastPointerUpType === 'touch' || lastPointerUpType === 'pen') {
+                 // there are no tooltips for touch interactions so flash feedback instead
+                 context.ui().flash.duration(4000).iconName('#iD-operation-' + operation.id).iconClass('operation disabled').label(operation.tooltip)();
                }
-
-               // This can happen if we've lowered the detail while a FROM way
-               // is selected, and that way is no longer part of the intersection.
-               if (_fromWayID && !vgraph.hasEntity(_fromWayID)) {
-                   _fromWayID = null;
-                   _oldTurns = null;
+             } else {
+               if (lastPointerUpType === 'touch' || lastPointerUpType === 'pen') {
+                 context.ui().flash.duration(2000).iconName('#iD-operation-' + operation.id).iconClass('operation').label(operation.annotation() || operation.title)();
                }
 
-               surface
-                   .call(utilSetDimensions, d)
-                   .call(drawVertices, vgraph, _intersection.vertices, filter, extent, z)
-                   .call(drawLines, vgraph, _intersection.ways, filter)
-                   .call(drawTurns, vgraph, _intersection.turns(_fromWayID, _maxViaWay));
-
-               surface
-                   .on('click.restrictions', click)
-                   .on('mouseover.restrictions', mouseover);
-
-               surface
-                   .selectAll('.selected')
-                   .classed('selected', false);
-
-               surface
-                   .selectAll('.related')
-                   .classed('related', false);
+               operation();
+               editMenu.close();
+             }
 
-               if (_fromWayID) {
-                   var way = vgraph.entity(_fromWayID);
-                   surface
-                       .selectAll('.' + _fromWayID)
-                       .classed('selected', true)
-                       .classed('related', true);
-               }
+             lastPointerUpType = null;
+           }
 
-               document.addEventListener('resizeWindow', function () {
-                   utilSetDimensions(_container, null);
-                   redraw(1);
-               }, false);
+           dispatch$1.call('toggled', this, true);
+         };
 
-               updateHints(null);
+         function updatePosition() {
+           if (!_menu || _menu.empty()) return;
+           var anchorLoc = context.projection(_anchorLocLonLat);
+           var viewport = context.surfaceRect();
 
+           if (anchorLoc[0] < 0 || anchorLoc[0] > viewport.width || anchorLoc[1] < 0 || anchorLoc[1] > viewport.height) {
+             // close the menu if it's gone offscreen
+             editMenu.close();
+             return;
+           }
 
-               function click() {
-                   surface
-                       .call(breathe.off)
-                       .call(breathe);
+           var menuLeft = displayOnLeft(viewport);
+           var offset = [0, 0];
+           offset[0] = menuLeft ? -1 * (_menuSideMargin + _menuWidth) : _menuSideMargin;
 
-                   var datum = event.target.__data__;
-                   var entity = datum && datum.properties && datum.properties.entity;
-                   if (entity) {
-                       datum = entity;
-                   }
+           if (_menuTop) {
+             if (anchorLoc[1] - _menuHeight < _vpTopMargin) {
+               // menu is near top viewport edge, shift downward
+               offset[1] = -anchorLoc[1] + _vpTopMargin;
+             } else {
+               offset[1] = -_menuHeight;
+             }
+           } else {
+             if (anchorLoc[1] + _menuHeight > viewport.height - _vpBottomMargin) {
+               // menu is near bottom viewport edge, shift upwards
+               offset[1] = -anchorLoc[1] - _menuHeight + viewport.height - _vpBottomMargin;
+             } else {
+               offset[1] = 0;
+             }
+           }
 
-                   if (datum instanceof osmWay && (datum.__from || datum.__via)) {
-                       _fromWayID = datum.id;
-                       _oldTurns = null;
-                       redraw();
+           var origin = geoVecAdd(anchorLoc, offset);
 
-                   } else if (datum instanceof osmTurn) {
-                       var actions, extraActions, turns, i;
-                       var restrictionType = osmInferRestriction(vgraph, datum, projection);
+           _menu.style('left', origin[0] + 'px').style('top', origin[1] + 'px');
 
-                       if (datum.restrictionID && !datum.direct) {
-                           return;
+           var tooltipSide = tooltipPosition(viewport, menuLeft);
 
-                       } else if (datum.restrictionID && !datum.only) {    // NO -> ONLY
-                           var seen = {};
-                           var datumOnly = JSON.parse(JSON.stringify(datum));   // deep clone the datum
-                           datumOnly.only = true;                               // but change this property
-                           restrictionType = restrictionType.replace(/^no/, 'only');
-
-                           // Adding an ONLY restriction should destroy all other direct restrictions from the FROM towards the VIA.
-                           // We will remember them in _oldTurns, and restore them if the user clicks again.
-                           turns = _intersection.turns(_fromWayID, 2);
-                           extraActions = [];
-                           _oldTurns = [];
-                           for (i = 0; i < turns.length; i++) {
-                               var turn = turns[i];
-                               if (seen[turn.restrictionID]) continue;  // avoid deleting the turn twice (#4968, #4928)
-
-                               if (turn.direct && turn.path[1] === datum.path[1]) {
-                                   seen[turns[i].restrictionID] = true;
-                                   turn.restrictionType = osmInferRestriction(vgraph, turn, projection);
-                                   _oldTurns.push(turn);
-                                   extraActions.push(actionUnrestrictTurn(turn));
-                               }
-                           }
+           _tooltips.forEach(function (tooltip) {
+             tooltip.placement(tooltipSide);
+           });
 
-                           actions = _intersection.actions.concat(extraActions, [
-                               actionRestrictTurn(datumOnly, restrictionType),
-                               _t('operations.restriction.annotation.create')
-                           ]);
-
-                       } else if (datum.restrictionID) {   // ONLY -> Allowed
-                           // Restore whatever restrictions we might have destroyed by cycling thru the ONLY state.
-                           // This relies on the assumption that the intersection was already split up when we
-                           // performed the previous action (NO -> ONLY), so the IDs in _oldTurns shouldn't have changed.
-                           turns = _oldTurns || [];
-                           extraActions = [];
-                           for (i = 0; i < turns.length; i++) {
-                               if (turns[i].key !== datum.key) {
-                                   extraActions.push(actionRestrictTurn(turns[i], turns[i].restrictionType));
-                               }
-                           }
-                           _oldTurns = null;
-
-                           actions = _intersection.actions.concat(extraActions, [
-                               actionUnrestrictTurn(datum),
-                               _t('operations.restriction.annotation.delete')
-                           ]);
-
-                       } else {    // Allowed -> NO
-                           actions = _intersection.actions.concat([
-                               actionRestrictTurn(datum, restrictionType),
-                               _t('operations.restriction.annotation.create')
-                           ]);
-                       }
+           function displayOnLeft(viewport) {
+             if (_mainLocalizer.textDirection() === 'ltr') {
+               if (anchorLoc[0] + _menuSideMargin + _menuWidth > viewport.width - _vpSideMargin) {
+                 // right menu would be too close to the right viewport edge, go left
+                 return true;
+               } // prefer right menu
 
-                       context.perform.apply(context, actions);
 
-                       // At this point the datum will be changed, but will have same key..
-                       // Refresh it and update the help..
-                       var s = surface.selectAll('.' + datum.key);
-                       datum = s.empty() ? null : s.datum();
-                       updateHints(datum);
+               return false;
+             } else {
+               // rtl
+               if (anchorLoc[0] - _menuSideMargin - _menuWidth < _vpSideMargin) {
+                 // left menu would be too close to the left viewport edge, go right
+                 return false;
+               } // prefer left menu
 
-                   } else {
-                       _fromWayID = null;
-                       _oldTurns = null;
-                       redraw();
-                   }
-               }
 
+               return true;
+             }
+           }
 
-               function mouseover() {
-                   var datum = event.target.__data__;
-                   updateHints(datum);
+           function tooltipPosition(viewport, menuLeft) {
+             if (_mainLocalizer.textDirection() === 'ltr') {
+               if (menuLeft) {
+                 // if there's not room for a right-side menu then there definitely
+                 // isn't room for right-side tooltips
+                 return 'left';
                }
 
-               _lastXPos = _lastXPos || sdims[0];
-
-               function redraw(minChange) {
-                   var xPos = -1;
+               if (anchorLoc[0] + _menuSideMargin + _menuWidth + _tooltipWidth > viewport.width - _vpSideMargin) {
+                 // right tooltips would be too close to the right viewport edge, go left
+                 return 'left';
+               } // prefer right tooltips
 
-                   if (minChange) {
-                       xPos = utilGetDimensions(context.container().select('.sidebar'))[0];
-                   }
 
-                   if (!minChange || (minChange && Math.abs(xPos - _lastXPos) >= minChange)) {
-                       if (context.hasEntity(_vertexID)) {
-                           _lastXPos = xPos;
-                           _container.call(renderViewer);
-                       }
-                   }
+               return 'right';
+             } else {
+               // rtl
+               if (!menuLeft) {
+                 return 'right';
                }
 
+               if (anchorLoc[0] - _menuSideMargin - _menuWidth - _tooltipWidth < _vpSideMargin) {
+                 // left tooltips would be too close to the left viewport edge, go right
+                 return 'right';
+               } // prefer left tooltips
 
-               function highlightPathsFrom(wayID) {
-                   surface.selectAll('.related')
-                       .classed('related', false)
-                       .classed('allow', false)
-                       .classed('restrict', false)
-                       .classed('only', false);
 
-                   surface.selectAll('.' + wayID)
-                       .classed('related', true);
+               return 'left';
+             }
+           }
+         }
+
+         editMenu.close = function () {
+           context.map().on('move.edit-menu', null).on('drawn.edit-menu', null);
 
-                   if (wayID) {
-                       var turns = _intersection.turns(wayID, _maxViaWay);
-                       for (var i = 0; i < turns.length; i++) {
-                           var turn = turns[i];
-                           var ids = [turn.to.way];
-                           var klass = (turn.no ? 'restrict' : (turn.only ? 'only' : 'allow'));
+           _menu.remove();
 
-                           if (turn.only || turns.length === 1) {
-                               if (turn.via.ways) {
-                                   ids = ids.concat(turn.via.ways);
-                               }
-                           } else if (turn.to.way === wayID) {
-                               continue;
-                           }
+           _tooltips = [];
+           dispatch$1.call('toggled', this, false);
+         };
 
-                           surface.selectAll(utilEntitySelector(ids))
-                               .classed('related', true)
-                               .classed('allow', (klass === 'allow'))
-                               .classed('restrict', (klass === 'restrict'))
-                               .classed('only', (klass === 'only'));
-                       }
-                   }
-               }
+         editMenu.anchorLoc = function (val) {
+           if (!arguments.length) return _anchorLoc;
+           _anchorLoc = val;
+           _anchorLocLonLat = context.projection.invert(_anchorLoc);
+           return editMenu;
+         };
 
+         editMenu.triggerType = function (val) {
+           if (!arguments.length) return _triggerType;
+           _triggerType = val;
+           return editMenu;
+         };
 
-               function updateHints(datum) {
-                   var help = _container.selectAll('.restriction-help').html('');
+         editMenu.operations = function (val) {
+           if (!arguments.length) return _operations;
+           _operations = val;
+           return editMenu;
+         };
 
-                   var placeholders = {};
-                   ['from', 'via', 'to'].forEach(function(k) {
-                       placeholders[k] = '<span class="qualifier">' + _t('restriction.help.' + k) + '</span>';
-                   });
+         return utilRebind(editMenu, dispatch$1, 'on');
+       }
 
-                   var entity = datum && datum.properties && datum.properties.entity;
-                   if (entity) {
-                       datum = entity;
-                   }
+       function uiFeatureInfo(context) {
+         function update(selection) {
+           var features = context.features();
+           var stats = features.stats();
+           var count = 0;
+           var hiddenList = features.hidden().map(function (k) {
+             if (stats[k]) {
+               count += stats[k];
+               return _t('inspector.title_count', {
+                 title: _t.html('feature.' + k + '.description'),
+                 count: stats[k]
+               });
+             }
 
-                   if (_fromWayID) {
-                       way = vgraph.entity(_fromWayID);
-                       surface
-                           .selectAll('.' + _fromWayID)
-                           .classed('selected', true)
-                           .classed('related', true);
-                   }
+             return null;
+           }).filter(Boolean);
+           selection.html('');
 
-                   // Hovering a way
-                   if (datum instanceof osmWay && datum.__from) {
-                       way = datum;
-
-                       highlightPathsFrom(_fromWayID ? null : way.id);
-                       surface.selectAll('.' + way.id)
-                           .classed('related', true);
-
-                       var clickSelect = (!_fromWayID || _fromWayID !== way.id);
-                       help
-                           .append('div')      // "Click to select FROM {fromName}." / "FROM {fromName}"
-                           .html(_t('restriction.help.' + (clickSelect ? 'select_from_name' : 'from_name'), {
-                               from: placeholders.from,
-                               fromName: displayName(way.id, vgraph)
-                           }));
-
-
-                   // Hovering a turn arrow
-                   } else if (datum instanceof osmTurn) {
-                       var restrictionType = osmInferRestriction(vgraph, datum, projection);
-                       var turnType = restrictionType.replace(/^(only|no)\_/, '');
-                       var indirect = (datum.direct === false ? _t('restriction.help.indirect') : '');
-                       var klass, turnText, nextText;
-
-                       if (datum.no) {
-                           klass = 'restrict';
-                           turnText = _t('restriction.help.turn.no_' + turnType, { indirect: indirect });
-                           nextText = _t('restriction.help.turn.only_' + turnType, { indirect: '' });
-                       } else if (datum.only) {
-                           klass = 'only';
-                           turnText = _t('restriction.help.turn.only_' + turnType, { indirect: indirect });
-                           nextText = _t('restriction.help.turn.allowed_' + turnType, { indirect: '' });
-                       } else {
-                           klass = 'allow';
-                           turnText = _t('restriction.help.turn.allowed_' + turnType, { indirect: indirect });
-                           nextText = _t('restriction.help.turn.no_' + turnType, { indirect: '' });
-                       }
+           if (hiddenList.length) {
+             var tooltipBehavior = uiTooltip().placement('top').title(function () {
+               return hiddenList.join('<br/>');
+             });
+             selection.append('a').attr('class', 'chip').attr('href', '#').html(_t.html('feature_info.hidden_warning', {
+               count: count
+             })).call(tooltipBehavior).on('click', function (d3_event) {
+               tooltipBehavior.hide();
+               d3_event.preventDefault(); // open the Map Data pane
 
-                       help
-                           .append('div')      // "NO Right Turn (indirect)"
-                           .attr('class', 'qualifier ' + klass)
-                           .text(turnText);
-
-                       help
-                           .append('div')      // "FROM {fromName} TO {toName}"
-                           .html(_t('restriction.help.from_name_to_name', {
-                               from: placeholders.from,
-                               fromName: displayName(datum.from.way, vgraph),
-                               to: placeholders.to,
-                               toName: displayName(datum.to.way, vgraph)
-                           }));
-
-                       if (datum.via.ways && datum.via.ways.length) {
-                           var names = [];
-                           for (var i = 0; i < datum.via.ways.length; i++) {
-                               var prev = names[names.length - 1];
-                               var curr = displayName(datum.via.ways[i], vgraph);
-                               if (!prev || curr !== prev)   // collapse identical names
-                                   names.push(curr);
-                           }
+               context.ui().togglePanes(context.container().select('.map-panes .map-data-pane'));
+             });
+           }
 
-                           help
-                               .append('div')      // "VIA {viaNames}"
-                               .html(_t('restriction.help.via_names', {
-                                   via: placeholders.via,
-                                   viaNames: names.join(', ')
-                               }));
-                       }
+           selection.classed('hide', !hiddenList.length);
+         }
 
-                       if (!indirect) {
-                           help
-                               .append('div')      // Click for "No Right Turn"
-                               .text(_t('restriction.help.toggle', { turn: nextText.trim() }));
-                       }
+         return function (selection) {
+           update(selection);
+           context.features().on('change.feature_info', function () {
+             update(selection);
+           });
+         };
+       }
 
-                       highlightPathsFrom(null);
-                       var alongIDs = datum.path.slice();
-                       surface.selectAll(utilEntitySelector(alongIDs))
-                           .classed('related', true)
-                           .classed('allow', (klass === 'allow'))
-                           .classed('restrict', (klass === 'restrict'))
-                           .classed('only', (klass === 'only'));
+       function uiFlash(context) {
+         var _flashTimer;
+
+         var _duration = 2000;
+         var _iconName = '#iD-icon-no';
+         var _iconClass = 'disabled';
+         var _label = '';
+
+         function flash() {
+           if (_flashTimer) {
+             _flashTimer.stop();
+           }
+
+           context.container().select('.main-footer-wrap').classed('footer-hide', true).classed('footer-show', false);
+           context.container().select('.flash-wrap').classed('footer-hide', false).classed('footer-show', true);
+           var content = context.container().select('.flash-wrap').selectAll('.flash-content').data([0]); // Enter
+
+           var contentEnter = content.enter().append('div').attr('class', 'flash-content');
+           var iconEnter = contentEnter.append('svg').attr('class', 'flash-icon icon').append('g').attr('transform', 'translate(10,10)');
+           iconEnter.append('circle').attr('r', 9);
+           iconEnter.append('use').attr('transform', 'translate(-7,-7)').attr('width', '14').attr('height', '14');
+           contentEnter.append('div').attr('class', 'flash-text'); // Update
+
+           content = content.merge(contentEnter);
+           content.selectAll('.flash-icon').attr('class', 'icon flash-icon ' + (_iconClass || ''));
+           content.selectAll('.flash-icon use').attr('xlink:href', _iconName);
+           content.selectAll('.flash-text').attr('class', 'flash-text').html(_label);
+           _flashTimer = d3_timeout(function () {
+             _flashTimer = null;
+             context.container().select('.main-footer-wrap').classed('footer-hide', false).classed('footer-show', true);
+             context.container().select('.flash-wrap').classed('footer-hide', true).classed('footer-show', false);
+           }, _duration);
+           return content;
+         }
+
+         flash.duration = function (_) {
+           if (!arguments.length) return _duration;
+           _duration = _;
+           return flash;
+         };
 
+         flash.label = function (_) {
+           if (!arguments.length) return _label;
+           _label = _;
+           return flash;
+         };
 
-                   // Hovering empty surface
-                   } else {
-                       highlightPathsFrom(null);
-                       if (_fromWayID) {
-                           help
-                               .append('div')      // "FROM {fromName}"
-                               .html(_t('restriction.help.from_name', {
-                                   from: placeholders.from,
-                                   fromName: displayName(_fromWayID, vgraph)
-                               }));
-
-                       } else {
-                           help
-                               .append('div')      // "Click to select a FROM segment."
-                               .html(_t('restriction.help.select_from', {
-                                   from: placeholders.from
-                               }));
-                       }
-                   }
-               }
-           }
+         flash.iconName = function (_) {
+           if (!arguments.length) return _iconName;
+           _iconName = _;
+           return flash;
+         };
 
+         flash.iconClass = function (_) {
+           if (!arguments.length) return _iconClass;
+           _iconClass = _;
+           return flash;
+         };
 
-           function displayMaxDistance(maxDist) {
-               var isImperial = !_mainLocalizer.usesMetric();
-               var opts;
+         return flash;
+       }
 
-               if (isImperial) {
-                   var distToFeet = {   // imprecise conversion for prettier display
-                       20: 70, 25: 85, 30: 100, 35: 115, 40: 130, 45: 145, 50: 160
-                   }[maxDist];
-                   opts = { distance: _t('units.feet', { quantity: distToFeet }) };
-               } else {
-                   opts = { distance: _t('units.meters', { quantity: maxDist }) };
-               }
+       function uiFullScreen(context) {
+         var element = context.container().node(); // var button = d3_select(null);
 
-               return _t('restriction.controls.distance_up_to', opts);
+         function getFullScreenFn() {
+           if (element.requestFullscreen) {
+             return element.requestFullscreen;
+           } else if (element.msRequestFullscreen) {
+             return element.msRequestFullscreen;
+           } else if (element.mozRequestFullScreen) {
+             return element.mozRequestFullScreen;
+           } else if (element.webkitRequestFullscreen) {
+             return element.webkitRequestFullscreen;
            }
+         }
 
-
-           function displayMaxVia(maxVia) {
-               return maxVia === 0 ? _t('restriction.controls.via_node_only')
-                   : maxVia === 1 ? _t('restriction.controls.via_up_to_one')
-                   : _t('restriction.controls.via_up_to_two');
+         function getExitFullScreenFn() {
+           if (document.exitFullscreen) {
+             return document.exitFullscreen;
+           } else if (document.msExitFullscreen) {
+             return document.msExitFullscreen;
+           } else if (document.mozCancelFullScreen) {
+             return document.mozCancelFullScreen;
+           } else if (document.webkitExitFullscreen) {
+             return document.webkitExitFullscreen;
            }
+         }
 
+         function isFullScreen() {
+           return document.fullscreenElement || document.mozFullScreenElement || document.webkitFullscreenElement || document.msFullscreenElement;
+         }
 
-           function displayName(entityID, graph) {
-               var entity = graph.entity(entityID);
-               var name = utilDisplayName(entity) || '';
-               var matched = _mainPresetIndex.match(entity, graph);
-               var type = (matched && matched.name()) || utilDisplayType(entity.id);
-               return name || type;
-           }
+         function isSupported() {
+           return !!getFullScreenFn();
+         }
 
+         function fullScreen(d3_event) {
+           d3_event.preventDefault();
 
-           restrictions.entityIDs = function(val) {
-               _intersection = null;
-               _fromWayID = null;
-               _oldTurns = null;
-               _vertexID = val[0];
-           };
+           if (!isFullScreen()) {
+             // button.classed('active', true);
+             getFullScreenFn().apply(element);
+           } else {
+             // button.classed('active', false);
+             getExitFullScreenFn().apply(document);
+           }
+         }
 
+         return function () {
+           // selection) {
+           if (!isSupported()) return; // button = selection.append('button')
+           //     .attr('title', t('full_screen'))
+           //     .on('click', fullScreen)
+           //     .call(tooltip);
+           // button.append('span')
+           //     .attr('class', 'icon full-screen');
 
-           restrictions.tags = function() {};
-           restrictions.focus = function() {};
+           var detected = utilDetect();
+           var keys = detected.os === 'mac' ? [uiCmd('⌃⌘F'), 'f11'] : ['f11'];
+           context.keybinding().on(keys, fullScreen);
+         };
+       }
 
+       function uiGeolocate(context) {
+         var _geolocationOptions = {
+           // prioritize speed and power usage over precision
+           enableHighAccuracy: false,
+           // don't hang indefinitely getting the location
+           timeout: 6000 // 6sec
 
-           restrictions.off = function(selection) {
-               if (!_initialized) return;
+         };
 
-               selection.selectAll('.surface')
-                   .call(breathe.off)
-                   .on('click.restrictions', null)
-                   .on('mouseover.restrictions', null);
+         var _locating = uiLoading(context).message(_t.html('geolocate.locating')).blocking(true);
 
-               select(window)
-                   .on('resize.restrictions', null);
-           };
+         var _layer = context.layers().layer('geolocate');
 
+         var _position;
 
-           return utilRebind(restrictions, dispatch$1, 'on');
-       }
+         var _extent;
 
-       uiFieldRestrictions.supportsMultiselection = false;
+         var _timeoutID;
 
-       function uiFieldTextarea(field, context) {
-           var dispatch$1 = dispatch('change');
-           var input = select(null);
-           var _tags;
+         var _button = select(null);
 
+         function click() {
+           if (context.inIntro()) return;
 
-           function textarea(selection) {
-               var wrap = selection.selectAll('.form-field-input-wrap')
-                   .data([0]);
+           if (!_layer.enabled() && !_locating.isShown()) {
+             // This timeout ensures that we still call finish() even if
+             // the user declines to share their location in Firefox
+             _timeoutID = setTimeout(error, 10000
+             /* 10sec */
+             );
+             context.container().call(_locating); // get the latest position even if we already have one
 
-               wrap = wrap.enter()
-                   .append('div')
-                   .attr('class', 'form-field-input-wrap form-field-input-' + field.type)
-                   .merge(wrap);
+             navigator.geolocation.getCurrentPosition(success, error, _geolocationOptions);
+           } else {
+             _locating.close();
 
-               input = wrap.selectAll('textarea')
-                   .data([0]);
+             _layer.enabled(null, false);
 
-               input = input.enter()
-                   .append('textarea')
-                   .attr('id', field.domId)
-                   .call(utilNoAuto)
-                   .on('input', change(true))
-                   .on('blur', change())
-                   .on('change', change())
-                   .merge(input);
+             updateButtonState();
            }
+         }
 
+         function zoomTo() {
+           context.enter(modeBrowse(context));
+           var map = context.map();
 
-           function change(onInput) {
-               return function() {
+           _layer.enabled(_position, true);
 
-                   var val = utilGetSetValue(input);
-                   if (!onInput) val = context.cleanTagValue(val);
+           updateButtonState();
+           map.centerZoomEase(_extent.center(), Math.min(20, map.extentZoom(_extent)));
+         }
 
-                   // don't override multiple values with blank string
-                   if (!val && Array.isArray(_tags[field.key])) return;
+         function success(geolocation) {
+           _position = geolocation;
+           var coords = _position.coords;
+           _extent = geoExtent([coords.longitude, coords.latitude]).padByMeters(coords.accuracy);
+           zoomTo();
+           finish();
+         }
 
-                   var t = {};
-                   t[field.key] = val || undefined;
-                   dispatch$1.call('change', this, t, onInput);
-               };
+         function error() {
+           if (_position) {
+             // use the position from a previous call if we have one
+             zoomTo();
+           } else {
+             context.ui().flash.label(_t.html('geolocate.location_unavailable')).iconName('#iD-icon-geolocate')();
            }
 
+           finish();
+         }
 
-           textarea.tags = function(tags) {
-               _tags = tags;
-
-               var isMixed = Array.isArray(tags[field.key]);
+         function finish() {
+           _locating.close(); // unblock ui
 
-               utilGetSetValue(input, !isMixed && tags[field.key] ? tags[field.key] : '')
-                   .attr('title', isMixed ? tags[field.key].filter(Boolean).join('\n') : undefined)
-                   .attr('placeholder', isMixed ? _t('inspector.multiple_values') : (field.placeholder() || _t('inspector.unknown')))
-                   .classed('mixed', isMixed);
-           };
 
+           if (_timeoutID) {
+             clearTimeout(_timeoutID);
+           }
 
-           textarea.focus = function() {
-               input.node().focus();
-           };
+           _timeoutID = undefined;
+         }
 
+         function updateButtonState() {
+           _button.classed('active', _layer.enabled());
+         }
 
-           return utilRebind(textarea, dispatch$1, 'on');
+         return function (selection) {
+           if (!navigator.geolocation || !navigator.geolocation.getCurrentPosition) return;
+           _button = selection.append('button').on('click', click).call(svgIcon('#iD-icon-geolocate', 'light')).call(uiTooltip().placement(_mainLocalizer.textDirection() === 'rtl' ? 'right' : 'left').title(_t.html('geolocate.title')).keys([_t('geolocate.key')]));
+           context.keybinding().on(_t('geolocate.key'), click);
+         };
        }
 
-       function uiFieldWikidata(field, context) {
-           var wikidata = services.wikidata;
-           var dispatch$1 = dispatch('change');
-
-           var _selection = select(null);
-           var _searchInput = select(null);
-           var _qid = null;
-           var _wikidataEntity = null;
-           var _wikiURL = '';
-           var _entityIDs = [];
-
-           var _wikipediaKey = field.keys && field.keys.find(function(key) {
-                   return key.includes('wikipedia');
-               }),
-               _hintKey = field.key === 'wikidata' ? 'name' : field.key.split(':')[0];
+       function uiPanelBackground(context) {
+         var background = context.background();
+         var _currSourceName = null;
+         var _metadata = {};
+         var _metadataKeys = ['zoom', 'vintage', 'source', 'description', 'resolution', 'accuracy'];
 
-           var combobox = uiCombobox(context, 'combo-' + field.safeid)
-               .caseSensitive(true)
-               .minItems(1);
+         var debouncedRedraw = debounce(redraw, 250);
 
-           function wiki(selection) {
+         function redraw(selection) {
+           var source = background.baseLayerSource();
+           if (!source) return;
+           var isDG = source.id.match(/^DigitalGlobe/i) !== null;
+           var sourceLabel = source.label();
 
-               _selection = selection;
+           if (_currSourceName !== sourceLabel) {
+             _currSourceName = sourceLabel;
+             _metadata = {};
+           }
 
-               var wrap = selection.selectAll('.form-field-input-wrap')
-                   .data([0]);
+           selection.html('');
+           var list = selection.append('ul').attr('class', 'background-info');
+           list.append('li').html(_currSourceName);
 
-               wrap = wrap.enter()
-                   .append('div')
-                   .attr('class', 'form-field-input-wrap form-field-input-' + field.type)
-                   .merge(wrap);
-
-
-               var list = wrap.selectAll('ul')
-                   .data([0]);
-
-               list = list.enter()
-                   .append('ul')
-                   .attr('class', 'rows')
-                   .merge(list);
-
-               var searchRow = list.selectAll('li.wikidata-search')
-                   .data([0]);
-
-               var searchRowEnter = searchRow.enter()
-                   .append('li')
-                   .attr('class', 'wikidata-search');
-
-               searchRowEnter
-                   .append('input')
-                   .attr('type', 'text')
-                   .attr('id', field.domId)
-                   .style('flex', '1')
-                   .call(utilNoAuto)
-                   .on('focus', function() {
-                       var node = select(this).node();
-                       node.setSelectionRange(0, node.value.length);
-                   })
-                   .on('blur', function() {
-                       setLabelForEntity();
-                   })
-                   .call(combobox.fetcher(fetchWikidataItems));
-
-               combobox.on('accept', function(d) {
-                   _qid = d.id;
-                   change();
-               }).on('cancel', function() {
-                   setLabelForEntity();
-               });
+           _metadataKeys.forEach(function (k) {
+             // DigitalGlobe vintage is available in raster layers for now.
+             if (isDG && k === 'vintage') return;
+             list.append('li').attr('class', 'background-info-list-' + k).classed('hide', !_metadata[k]).html(_t.html('info_panels.background.' + k) + ':').append('span').attr('class', 'background-info-span-' + k).html(_metadata[k]);
+           });
 
-               searchRowEnter
-                   .append('button')
-                   .attr('class', 'form-field-button wiki-link')
-                   .attr('title', _t('icons.view_on', { domain: 'wikidata.org' }))
-                   .attr('tabindex', -1)
-                   .call(svgIcon('#iD-icon-out-link'))
-                   .on('click', function() {
-                       event.preventDefault();
-                       if (_wikiURL) window.open(_wikiURL, '_blank');
-                   });
+           debouncedGetMetadata(selection);
+           var toggleTiles = context.getDebug('tile') ? 'hide_tiles' : 'show_tiles';
+           selection.append('a').html(_t.html('info_panels.background.' + toggleTiles)).attr('href', '#').attr('class', 'button button-toggle-tiles').on('click', function (d3_event) {
+             d3_event.preventDefault();
+             context.setDebug('tile', !context.getDebug('tile'));
+             selection.call(redraw);
+           });
 
-               searchRow = searchRow.merge(searchRowEnter);
-
-               _searchInput = searchRow.select('input');
-
-               var wikidataProperties = ['description', 'identifier'];
-
-               var items = list.selectAll('li.labeled-input')
-                   .data(wikidataProperties);
-
-               // Enter
-               var enter = items.enter()
-                   .append('li')
-                   .attr('class', function(d) { return 'labeled-input preset-wikidata-' + d; });
-
-               enter
-                   .append('span')
-                   .attr('class', 'label')
-                   .text(function(d) { return _t('wikidata.' + d); });
-
-               enter
-                   .append('input')
-                   .attr('type', 'text')
-                   .call(utilNoAuto)
-                   .classed('disabled', 'true')
-                   .attr('readonly', 'true');
-
-               enter
-                   .append('button')
-                   .attr('class', 'form-field-button')
-                   .attr('title', _t('icons.copy'))
-                   .attr('tabindex', -1)
-                   .call(svgIcon('#iD-operation-copy'))
-                   .on('click', function() {
-                       event.preventDefault();
-                       select(this.parentNode)
-                           .select('input')
-                           .node()
-                           .select();
-                       document.execCommand('copy');
-                   });
+           if (isDG) {
+             var key = source.id + '-vintage';
+             var sourceVintage = context.background().findSource(key);
+             var showsVintage = context.background().showsLayer(sourceVintage);
+             var toggleVintage = showsVintage ? 'hide_vintage' : 'show_vintage';
+             selection.append('a').html(_t.html('info_panels.background.' + toggleVintage)).attr('href', '#').attr('class', 'button button-toggle-vintage').on('click', function (d3_event) {
+               d3_event.preventDefault();
+               context.background().toggleOverlayLayer(sourceVintage);
+               selection.call(redraw);
+             });
+           } // disable if necessary
 
-           }
 
-           function fetchWikidataItems(q, callback) {
+           ['DigitalGlobe-Premium', 'DigitalGlobe-Standard'].forEach(function (layerId) {
+             if (source.id !== layerId) {
+               var key = layerId + '-vintage';
+               var sourceVintage = context.background().findSource(key);
 
-               if (!q && _hintKey) {
-                   // other tags may be good search terms
-                   for (var i in _entityIDs) {
-                       var entity = context.hasEntity(_entityIDs[i]);
-                       if (entity.tags[_hintKey]) {
-                           q = entity.tags[_hintKey];
-                           break;
-                       }
-                   }
+               if (context.background().showsLayer(sourceVintage)) {
+                 context.background().toggleOverlayLayer(sourceVintage);
                }
+             }
+           });
+         }
 
-               wikidata.itemsForSearchQuery(q, function(err, data) {
-                   if (err) return;
+         var debouncedGetMetadata = debounce(getMetadata, 250);
 
-                   for (var i in data) {
-                       data[i].value = data[i].label + ' (' +  data[i].id + ')';
-                       data[i].title = data[i].description;
-                   }
+         function getMetadata(selection) {
+           var tile = context.container().select('.layer-background img.tile-center'); // tile near viewport center
 
-                   if (callback) callback(data);
-               });
-           }
+           if (tile.empty()) return;
+           var sourceName = _currSourceName;
+           var d = tile.datum();
+           var zoom = d && d.length >= 3 && d[2] || Math.floor(context.map().zoom());
+           var center = context.map().center(); // update zoom
 
+           _metadata.zoom = String(zoom);
+           selection.selectAll('.background-info-list-zoom').classed('hide', false).selectAll('.background-info-span-zoom').html(_metadata.zoom);
+           if (!d || !d.length >= 3) return;
+           background.baseLayerSource().getMetadata(center, d, function (err, result) {
+             if (err || _currSourceName !== sourceName) return; // update vintage
 
-           function change() {
-               var syncTags = {};
-               syncTags[field.key] = _qid;
-               dispatch$1.call('change', this, syncTags);
+             var vintage = result.vintage;
+             _metadata.vintage = vintage && vintage.range || _t('info_panels.background.unknown');
+             selection.selectAll('.background-info-list-vintage').classed('hide', false).selectAll('.background-info-span-vintage').html(_metadata.vintage); // update other _metadata
 
-               // attempt asynchronous update of wikidata tag..
-               var initGraph = context.graph();
-               var initEntityIDs = _entityIDs;
+             _metadataKeys.forEach(function (k) {
+               if (k === 'zoom' || k === 'vintage') return; // done already
 
-               wikidata.entityByQID(_qid, function(err, entity) {
-                   if (err) return;
+               var val = result[k];
+               _metadata[k] = val;
+               selection.selectAll('.background-info-list-' + k).classed('hide', !val).selectAll('.background-info-span-' + k).html(val);
+             });
+           });
+         }
 
-                   // If graph has changed, we can't apply this update.
-                   if (context.graph() !== initGraph) return;
+         var panel = function panel(selection) {
+           selection.call(redraw);
+           context.map().on('drawn.info-background', function () {
+             selection.call(debouncedRedraw);
+           }).on('move.info-background', function () {
+             selection.call(debouncedGetMetadata);
+           });
+         };
 
-                   if (!entity.sitelinks) return;
+         panel.off = function () {
+           context.map().on('drawn.info-background', null).on('move.info-background', null);
+         };
 
-                   var langs = wikidata.languagesToQuery();
-                   // use the label and description languages as fallbacks
-                   ['labels', 'descriptions'].forEach(function(key) {
-                       if (!entity[key]) return;
+         panel.id = 'background';
+         panel.label = _t.html('info_panels.background.title');
+         panel.key = _t('info_panels.background.key');
+         return panel;
+       }
 
-                       var valueLangs = Object.keys(entity[key]);
-                       if (valueLangs.length === 0) return;
-                       var valueLang = valueLangs[0];
+       function uiPanelHistory(context) {
+         var osm;
 
-                       if (langs.indexOf(valueLang) === -1) {
-                           langs.push(valueLang);
-                       }
-                   });
+         function displayTimestamp(timestamp) {
+           if (!timestamp) return _t('info_panels.history.unknown');
+           var options = {
+             day: 'numeric',
+             month: 'short',
+             year: 'numeric',
+             hour: 'numeric',
+             minute: 'numeric',
+             second: 'numeric'
+           };
+           var d = new Date(timestamp);
+           if (isNaN(d.getTime())) return _t('info_panels.history.unknown');
+           return d.toLocaleString(_mainLocalizer.localeCode(), options);
+         }
 
-                   var newWikipediaValue;
-
-                   if (_wikipediaKey) {
-                       var foundPreferred;
-                       for (var i in langs) {
-                           var lang = langs[i];
-                           var siteID = lang.replace('-', '_') + 'wiki';
-                           if (entity.sitelinks[siteID]) {
-                               foundPreferred = true;
-                               newWikipediaValue = lang + ':' + entity.sitelinks[siteID].title;
-                               // use the first match
-                               break;
-                           }
-                       }
+         function displayUser(selection, userName) {
+           if (!userName) {
+             selection.append('span').html(_t.html('info_panels.history.unknown'));
+             return;
+           }
 
-                       if (!foundPreferred) {
-                           // No wikipedia sites available in the user's language or the fallback languages,
-                           // default to any wikipedia sitelink
+           selection.append('span').attr('class', 'user-name').html(userName);
+           var links = selection.append('div').attr('class', 'links');
 
-                           var wikiSiteKeys = Object.keys(entity.sitelinks).filter(function(site) {
-                               return site.endsWith('wiki');
-                           });
+           if (osm) {
+             links.append('a').attr('class', 'user-osm-link').attr('href', osm.userURL(userName)).attr('target', '_blank').html('OSM');
+           }
 
-                           if (wikiSiteKeys.length === 0) {
-                               // if no wikipedia pages are linked to this wikidata entity, delete that tag
-                               newWikipediaValue = null;
-                           } else {
-                               var wikiLang = wikiSiteKeys[0].slice(0, -4).replace('_', '-');
-                               var wikiTitle = entity.sitelinks[wikiSiteKeys[0]].title;
-                               newWikipediaValue = wikiLang + ':' + wikiTitle;
-                           }
-                       }
-                   }
+           links.append('a').attr('class', 'user-hdyc-link').attr('href', 'https://hdyc.neis-one.org/?' + userName).attr('target', '_blank').attr('tabindex', -1).html('HDYC');
+         }
 
-                   if (newWikipediaValue) {
-                       newWikipediaValue = context.cleanTagValue(newWikipediaValue);
-                   }
+         function displayChangeset(selection, changeset) {
+           if (!changeset) {
+             selection.append('span').html(_t.html('info_panels.history.unknown'));
+             return;
+           }
 
-                   if (typeof newWikipediaValue === 'undefined') return;
+           selection.append('span').attr('class', 'changeset-id').html(changeset);
+           var links = selection.append('div').attr('class', 'links');
 
-                   var actions = initEntityIDs.map(function(entityID) {
-                       var entity = context.hasEntity(entityID);
-                       if (!entity) return;
+           if (osm) {
+             links.append('a').attr('class', 'changeset-osm-link').attr('href', osm.changesetURL(changeset)).attr('target', '_blank').html('OSM');
+           }
 
-                       var currTags = Object.assign({}, entity.tags);  // shallow copy
-                       if (newWikipediaValue === null) {
-                           if (!currTags[_wikipediaKey]) return;
+           links.append('a').attr('class', 'changeset-osmcha-link').attr('href', 'https://osmcha.org/changesets/' + changeset).attr('target', '_blank').html('OSMCha');
+           links.append('a').attr('class', 'changeset-achavi-link').attr('href', 'https://overpass-api.de/achavi/?changeset=' + changeset).attr('target', '_blank').html('Achavi');
+         }
 
-                           delete currTags[_wikipediaKey];
-                       } else {
-                           currTags[_wikipediaKey] = newWikipediaValue;
-                       }
+         function redraw(selection) {
+           var selectedNoteID = context.selectedNoteID();
+           osm = context.connection();
+           var selected, note, entity;
 
-                       return actionChangeTags(entityID, currTags);
-                   }).filter(Boolean);
+           if (selectedNoteID && osm) {
+             // selected 1 note
+             selected = [_t('note.note') + ' ' + selectedNoteID];
+             note = osm.getNote(selectedNoteID);
+           } else {
+             // selected 1..n entities
+             selected = context.selectedIDs().filter(function (e) {
+               return context.hasEntity(e);
+             });
 
-                   if (!actions.length) return;
+             if (selected.length) {
+               entity = context.entity(selected[0]);
+             }
+           }
 
-                   // Coalesce the update of wikidata tag into the previous tag change
-                   context.overwrite(
-                       function actionUpdateWikipediaTags(graph) {
-                           actions.forEach(function(action) {
-                               graph = action(graph);
-                           });
-                           return graph;
-                       },
-                       context.history().undoAnnotation()
-                   );
+           var singular = selected.length === 1 ? selected[0] : null;
+           selection.html('');
+           selection.append('h4').attr('class', 'history-heading').html(singular || _t.html('info_panels.selected', {
+             n: selected.length
+           }));
+           if (!singular) return;
 
-                   // do not dispatch.call('change') here, because entity_editor
-                   // changeTags() is not intended to be called asynchronously
-               });
+           if (entity) {
+             selection.call(redrawEntity, entity);
+           } else if (note) {
+             selection.call(redrawNote, note);
            }
+         }
 
-           function setLabelForEntity() {
-               var label = '';
-               if (_wikidataEntity) {
-                   label = entityPropertyForDisplay(_wikidataEntity, 'labels');
-                   if (label.length === 0) {
-                       label = _wikidataEntity.id.toString();
-                   }
-               }
-               utilGetSetValue(_searchInput, label);
+         function redrawNote(selection, note) {
+           if (!note || note.isNew()) {
+             selection.append('div').html(_t.html('info_panels.history.note_no_history'));
+             return;
            }
 
+           var list = selection.append('ul');
+           list.append('li').html(_t.html('info_panels.history.note_comments') + ':').append('span').html(note.comments.length);
 
-           wiki.tags = function(tags) {
-
-               var isMixed = Array.isArray(tags[field.key]);
-               _searchInput
-                   .attr('title', isMixed ? tags[field.key].filter(Boolean).join('\n') : null)
-                   .attr('placeholder', isMixed ? _t('inspector.multiple_values') : '')
-                   .classed('mixed', isMixed);
-
-               _qid = typeof tags[field.key] === 'string' && tags[field.key] || '';
+           if (note.comments.length) {
+             list.append('li').html(_t.html('info_panels.history.note_created_date') + ':').append('span').html(displayTimestamp(note.comments[0].date));
+             list.append('li').html(_t.html('info_panels.history.note_created_user') + ':').call(displayUser, note.comments[0].user);
+           }
 
-               if (!/^Q[0-9]*$/.test(_qid)) {   // not a proper QID
-                   unrecognized();
-                   return;
-               }
+           if (osm) {
+             selection.append('a').attr('class', 'view-history-on-osm').attr('target', '_blank').attr('href', osm.noteURL(note)).call(svgIcon('#iD-icon-out-link', 'inline')).append('span').html(_t.html('info_panels.history.note_link_text'));
+           }
+         }
 
-               // QID value in correct format
-               _wikiURL = 'https://wikidata.org/wiki/' + _qid;
-               wikidata.entityByQID(_qid, function(err, entity) {
-                   if (err) {
-                       unrecognized();
-                       return;
-                   }
-                   _wikidataEntity = entity;
+         function redrawEntity(selection, entity) {
+           if (!entity || entity.isNew()) {
+             selection.append('div').html(_t.html('info_panels.history.no_history'));
+             return;
+           }
 
-                   setLabelForEntity();
+           var links = selection.append('div').attr('class', 'links');
 
-                   var description = entityPropertyForDisplay(entity, 'descriptions');
+           if (osm) {
+             links.append('a').attr('class', 'view-history-on-osm').attr('href', osm.historyURL(entity)).attr('target', '_blank').attr('title', _t('info_panels.history.link_text')).html('OSM');
+           }
 
-                   _selection.select('button.wiki-link')
-                       .classed('disabled', false);
+           links.append('a').attr('class', 'pewu-history-viewer-link').attr('href', 'https://pewu.github.io/osm-history/#/' + entity.type + '/' + entity.osmId()).attr('target', '_blank').attr('tabindex', -1).html('PeWu');
+           var list = selection.append('ul');
+           list.append('li').html(_t.html('info_panels.history.version') + ':').append('span').html(entity.version);
+           list.append('li').html(_t.html('info_panels.history.last_edit') + ':').append('span').html(displayTimestamp(entity.timestamp));
+           list.append('li').html(_t.html('info_panels.history.edited_by') + ':').call(displayUser, entity.user);
+           list.append('li').html(_t.html('info_panels.history.changeset') + ':').call(displayChangeset, entity.changeset);
+         }
 
-                   _selection.select('.preset-wikidata-description')
-                       .style('display', function(){
-                           return description.length > 0 ? 'flex' : 'none';
-                       })
-                       .select('input')
-                       .attr('value', description);
+         var panel = function panel(selection) {
+           selection.call(redraw);
+           context.map().on('drawn.info-history', function () {
+             selection.call(redraw);
+           });
+           context.on('enter.info-history', function () {
+             selection.call(redraw);
+           });
+         };
 
-                   _selection.select('.preset-wikidata-identifier')
-                       .style('display', function(){
-                           return entity.id ? 'flex' : 'none';
-                       })
-                       .select('input')
-                       .attr('value', entity.id);
-               });
+         panel.off = function () {
+           context.map().on('drawn.info-history', null);
+           context.on('enter.info-history', null);
+         };
 
+         panel.id = 'history';
+         panel.label = _t.html('info_panels.history.title');
+         panel.key = _t('info_panels.history.key');
+         return panel;
+       }
 
-               // not a proper QID
-               function unrecognized() {
-                   _wikidataEntity = null;
-                   setLabelForEntity();
+       var OSM_PRECISION = 7;
+       /**
+        * Returns a localized representation of the given length measurement.
+        *
+        * @param {Number} m area in meters
+        * @param {Boolean} isImperial true for U.S. customary units; false for metric
+        */
 
-                   _selection.select('.preset-wikidata-description')
-                       .style('display', 'none');
-                   _selection.select('.preset-wikidata-identifier')
-                       .style('display', 'none');
+       function displayLength(m, isImperial) {
+         var d = m * (isImperial ? 3.28084 : 1);
+         var unit;
 
-                   _selection.select('button.wiki-link')
-                       .classed('disabled', true);
+         if (isImperial) {
+           if (d >= 5280) {
+             d /= 5280;
+             unit = 'miles';
+           } else {
+             unit = 'feet';
+           }
+         } else {
+           if (d >= 1000) {
+             d /= 1000;
+             unit = 'kilometers';
+           } else {
+             unit = 'meters';
+           }
+         }
 
-                   if (_qid && _qid !== '') {
-                       _wikiURL = 'https://wikidata.org/wiki/Special:Search?search=' + _qid;
-                   } else {
-                       _wikiURL = '';
-                   }
-               }
-           };
+         return _t('units.' + unit, {
+           quantity: d.toLocaleString(_mainLocalizer.localeCode(), {
+             maximumSignificantDigits: 4
+           })
+         });
+       }
+       /**
+        * Returns a localized representation of the given area measurement.
+        *
+        * @param {Number} m2 area in square meters
+        * @param {Boolean} isImperial true for U.S. customary units; false for metric
+        */
 
-           function entityPropertyForDisplay(wikidataEntity, propKey) {
-               if (!wikidataEntity[propKey]) return '';
-               var propObj = wikidataEntity[propKey];
-               var langKeys = Object.keys(propObj);
-               if (langKeys.length === 0) return '';
-               // sorted by priority, since we want to show the user's language first if possible
-               var langs = wikidata.languagesToQuery();
-               for (var i in langs) {
-                   var lang = langs[i];
-                   var valueObj = propObj[lang];
-                   if (valueObj && valueObj.value && valueObj.value.length > 0) return valueObj.value;
-               }
-               // default to any available value
-               return propObj[langKeys[0]].value;
+       function displayArea(m2, isImperial) {
+         var locale = _mainLocalizer.localeCode();
+         var d = m2 * (isImperial ? 10.7639111056 : 1);
+         var d1, d2, area;
+         var unit1 = '';
+         var unit2 = '';
+
+         if (isImperial) {
+           if (d >= 6969600) {
+             // > 0.25mi² show mi²
+             d1 = d / 27878400;
+             unit1 = 'square_miles';
+           } else {
+             d1 = d;
+             unit1 = 'square_feet';
            }
 
+           if (d > 4356 && d < 43560000) {
+             // 0.1 - 1000 acres
+             d2 = d / 43560;
+             unit2 = 'acres';
+           }
+         } else {
+           if (d >= 250000) {
+             // > 0.25km² show km²
+             d1 = d / 1000000;
+             unit1 = 'square_kilometers';
+           } else {
+             d1 = d;
+             unit1 = 'square_meters';
+           }
 
-           wiki.entityIDs = function(val) {
-               if (!arguments.length) return _entityIDs;
-               _entityIDs = val;
-               return wiki;
-           };
-
+           if (d > 1000 && d < 10000000) {
+             // 0.1 - 1000 hectares
+             d2 = d / 10000;
+             unit2 = 'hectares';
+           }
+         }
 
-           wiki.focus = function() {
-               _searchInput.node().focus();
-           };
+         area = _t('units.' + unit1, {
+           quantity: d1.toLocaleString(locale, {
+             maximumSignificantDigits: 4
+           })
+         });
 
+         if (d2) {
+           return _t('units.area_pair', {
+             area1: area,
+             area2: _t('units.' + unit2, {
+               quantity: d2.toLocaleString(locale, {
+                 maximumSignificantDigits: 2
+               })
+             })
+           });
+         } else {
+           return area;
+         }
+       }
 
-           return utilRebind(wiki, dispatch$1, 'on');
+       function wrap$2(x, min, max) {
+         var d = max - min;
+         return ((x - min) % d + d) % d + min;
        }
 
-       function uiFieldWikipedia(field, context) {
-         const dispatch$1 = dispatch('change');
-         const wikipedia = services.wikipedia;
-         const wikidata = services.wikidata;
-         let _langInput = select(null);
-         let _titleInput = select(null);
-         let _wikiURL = '';
-         let _entityIDs;
-         let _tags;
-
-         let _dataWikipedia = [];
-         _mainFileFetcher.get('wmf_sitematrix')
-           .then(d => {
-             _dataWikipedia = d;
-             if (_tags) updateForTags(_tags);
-           })
-           .catch(() => { /* ignore */ });
+       function clamp$1(x, min, max) {
+         return Math.max(min, Math.min(x, max));
+       }
 
+       function displayCoordinate(deg, pos, neg) {
+         var locale = _mainLocalizer.localeCode();
+         var min = (Math.abs(deg) - Math.floor(Math.abs(deg))) * 60;
+         var sec = (min - Math.floor(min)) * 60;
+         var displayDegrees = _t('units.arcdegrees', {
+           quantity: Math.floor(Math.abs(deg)).toLocaleString(locale)
+         });
+         var displayCoordinate;
 
-         const langCombo = uiCombobox(context, 'wikipedia-lang')
-           .fetcher((value, callback) => {
-             const v = value.toLowerCase();
-             callback(_dataWikipedia
-               .filter(d => {
-                 return d[0].toLowerCase().indexOf(v) >= 0 ||
-                   d[1].toLowerCase().indexOf(v) >= 0 ||
-                   d[2].toLowerCase().indexOf(v) >= 0;
-               })
-               .map(d => ({ value: d[1] }))
-             );
+         if (Math.floor(sec) > 0) {
+           displayCoordinate = displayDegrees + _t('units.arcminutes', {
+             quantity: Math.floor(min).toLocaleString(locale)
+           }) + _t('units.arcseconds', {
+             quantity: Math.round(sec).toLocaleString(locale)
+           });
+         } else if (Math.floor(min) > 0) {
+           displayCoordinate = displayDegrees + _t('units.arcminutes', {
+             quantity: Math.round(min).toLocaleString(locale)
            });
+         } else {
+           displayCoordinate = _t('units.arcdegrees', {
+             quantity: Math.round(Math.abs(deg)).toLocaleString(locale)
+           });
+         }
 
-         const titleCombo = uiCombobox(context, 'wikipedia-title')
-           .fetcher((value, callback) => {
-             if (!value) {
-               value = '';
-               for (let i in _entityIDs) {
-                 let entity = context.hasEntity(_entityIDs[i]);
-                 if (entity.tags.name) {
-                   value = entity.tags.name;
-                   break;
-                 }
-               }
-             }
-             const searchfn = value.length > 7 ? wikipedia.search : wikipedia.suggestions;
-             searchfn(language()[2], value, (query, data) => {
-               callback( data.map(d => ({ value: d })) );
-             });
+         if (deg === 0) {
+           return displayCoordinate;
+         } else {
+           return _t('units.coordinate', {
+             coordinate: displayCoordinate,
+             direction: _t('units.' + (deg > 0 ? pos : neg))
            });
+         }
+       }
+       /**
+        * Returns given coordinate pair in degree-minute-second format.
+        *
+        * @param {Array<Number>} coord longitude and latitude
+        */
 
 
-         function wiki(selection) {
-           let wrap = selection.selectAll('.form-field-input-wrap')
-             .data([0]);
+       function dmsCoordinatePair(coord) {
+         return _t('units.coordinate_pair', {
+           latitude: displayCoordinate(clamp$1(coord[1], -90, 90), 'north', 'south'),
+           longitude: displayCoordinate(wrap$2(coord[0], -180, 180), 'east', 'west')
+         });
+       }
+       /**
+        * Returns the given coordinate pair in decimal format.
+        * note: unlocalized to avoid comma ambiguity - see #4765
+        *
+        * @param {Array<Number>} coord longitude and latitude
+        */
 
-           wrap = wrap.enter()
-             .append('div')
-             .attr('class', `form-field-input-wrap form-field-input-${field.type}`)
-             .merge(wrap);
+       function decimalCoordinatePair(coord) {
+         return _t('units.coordinate_pair', {
+           latitude: clamp$1(coord[1], -90, 90).toFixed(OSM_PRECISION),
+           longitude: wrap$2(coord[0], -180, 180).toFixed(OSM_PRECISION)
+         });
+       }
 
+       function uiPanelLocation(context) {
+         var currLocation = '';
 
-           let langContainer = wrap.selectAll('.wiki-lang-container')
-             .data([0]);
+         function redraw(selection) {
+           selection.html('');
+           var list = selection.append('ul'); // Mouse coordinates
 
-           langContainer = langContainer.enter()
-             .append('div')
-             .attr('class', 'wiki-lang-container')
-             .merge(langContainer);
+           var coord = context.map().mouseCoordinates();
 
+           if (coord.some(isNaN)) {
+             coord = context.map().center();
+           }
 
-           _langInput = langContainer.selectAll('input.wiki-lang')
-             .data([0]);
+           list.append('li').html(dmsCoordinatePair(coord)).append('li').html(decimalCoordinatePair(coord)); // Location Info
 
-           _langInput = _langInput.enter()
-             .append('input')
-             .attr('type', 'text')
-             .attr('class', 'wiki-lang')
-             .attr('placeholder', _t('translate.localized_translation_language'))
-             .call(utilNoAuto)
-             .call(langCombo)
-             .merge(_langInput);
+           selection.append('div').attr('class', 'location-info').html(currLocation || ' ');
+           debouncedGetLocation(selection, coord);
+         }
 
-           utilGetSetValue(_langInput, language()[1]);
+         var debouncedGetLocation = debounce(getLocation, 250);
 
-           _langInput
-             .on('blur', changeLang)
-             .on('change', changeLang);
+         function getLocation(selection, coord) {
+           if (!services.geocoder) {
+             currLocation = _t('info_panels.location.unknown_location');
+             selection.selectAll('.location-info').html(currLocation);
+           } else {
+             services.geocoder.reverse(coord, function (err, result) {
+               currLocation = result ? result.display_name : _t('info_panels.location.unknown_location');
+               selection.selectAll('.location-info').html(currLocation);
+             });
+           }
+         }
 
+         var panel = function panel(selection) {
+           selection.call(redraw);
+           context.surface().on(('PointerEvent' in window ? 'pointer' : 'mouse') + 'move.info-location', function () {
+             selection.call(redraw);
+           });
+         };
 
-           let titleContainer = wrap.selectAll('.wiki-title-container')
-             .data([0]);
+         panel.off = function () {
+           context.surface().on('.info-location', null);
+         };
 
-           titleContainer = titleContainer.enter()
-             .append('div')
-             .attr('class', 'wiki-title-container')
-             .merge(titleContainer);
+         panel.id = 'location';
+         panel.label = _t.html('info_panels.location.title');
+         panel.key = _t('info_panels.location.key');
+         return panel;
+       }
 
-           _titleInput = titleContainer.selectAll('input.wiki-title')
-             .data([0]);
+       function uiPanelMeasurement(context) {
+         function radiansToMeters(r) {
+           // using WGS84 authalic radius (6371007.1809 m)
+           return r * 6371007.1809;
+         }
 
-           _titleInput = _titleInput.enter()
-             .append('input')
-             .attr('type', 'text')
-             .attr('class', 'wiki-title')
-             .attr('id', field.domId)
-             .call(utilNoAuto)
-             .call(titleCombo)
-             .merge(_titleInput);
+         function steradiansToSqmeters(r) {
+           // http://gis.stackexchange.com/a/124857/40446
+           return r / (4 * Math.PI) * 510065621724000;
+         }
 
-           _titleInput
-             .on('blur', blur)
-             .on('change', change);
+         function toLineString(feature) {
+           if (feature.type === 'LineString') return feature;
+           var result = {
+             type: 'LineString',
+             coordinates: []
+           };
 
+           if (feature.type === 'Polygon') {
+             result.coordinates = feature.coordinates[0];
+           } else if (feature.type === 'MultiPolygon') {
+             result.coordinates = feature.coordinates[0][0];
+           }
 
-           let link = titleContainer.selectAll('.wiki-link')
-             .data([0]);
+           return result;
+         }
 
-           link = link.enter()
-             .append('button')
-             .attr('class', 'form-field-button wiki-link')
-             .attr('tabindex', -1)
-             .attr('title', _t('icons.view_on', { domain: 'wikipedia.org' }))
-             .call(svgIcon('#iD-icon-out-link'))
-             .merge(link);
+         var _isImperial = !_mainLocalizer.usesMetric();
 
-           link
-             .on('click', () => {
-               event.preventDefault();
-               if (_wikiURL) window.open(_wikiURL, '_blank');
+         function redraw(selection) {
+           var graph = context.graph();
+           var selectedNoteID = context.selectedNoteID();
+           var osm = services.osm;
+           var localeCode = _mainLocalizer.localeCode();
+           var heading;
+           var center, location, centroid;
+           var closed, geometry;
+           var totalNodeCount,
+               length = 0,
+               area = 0,
+               distance;
+
+           if (selectedNoteID && osm) {
+             // selected 1 note
+             var note = osm.getNote(selectedNoteID);
+             heading = _t('note.note') + ' ' + selectedNoteID;
+             location = note.loc;
+             geometry = 'note';
+           } else {
+             // selected 1..n entities
+             var selectedIDs = context.selectedIDs().filter(function (id) {
+               return context.hasEntity(id);
+             });
+             var selected = selectedIDs.map(function (id) {
+               return context.entity(id);
+             });
+             heading = selected.length === 1 ? selected[0].id : _t('info_panels.selected', {
+               n: selected.length
              });
-         }
 
+             if (selected.length) {
+               var extent = geoExtent();
 
-         function language() {
-           const value = utilGetSetValue(_langInput).toLowerCase();
-           const locale = _mainLocalizer.localeCode().toLowerCase();
-           let localeLanguage;
-           return _dataWikipedia.find(d => {
-             if (d[2] === locale) localeLanguage = d;
-             return d[0].toLowerCase() === value || d[1].toLowerCase() === value || d[2] === value;
-           }) || localeLanguage || ['English', 'English', 'en'];
-         }
+               for (var i in selected) {
+                 var entity = selected[i];
 
+                 extent._extend(entity.extent(graph));
 
-         function changeLang() {
-           utilGetSetValue(_langInput, language()[1]);
-           change(true);
-         }
+                 geometry = entity.geometry(graph);
 
+                 if (geometry === 'line' || geometry === 'area') {
+                   closed = entity.type === 'relation' || entity.isClosed() && !entity.isDegenerate();
+                   var feature = entity.asGeoJSON(graph);
+                   length += radiansToMeters(d3_geoLength(toLineString(feature))); // d3_geoCentroid is wrong for counterclockwise-wound polygons, so wind them clockwise
 
-         function blur() {
-           change(true);
-         }
+                   centroid = d3_geoCentroid(geojsonRewind(Object.assign({}, feature), true));
 
+                   if (closed) {
+                     area += steradiansToSqmeters(entity.area(graph));
+                   }
+                 }
+               }
 
-         function change(skipWikidata) {
-           let value = utilGetSetValue(_titleInput);
-           const m = value.match(/https?:\/\/([-a-z]+)\.wikipedia\.org\/(?:wiki|\1-[-a-z]+)\/([^#]+)(?:#(.+))?/);
-           const l = m && _dataWikipedia.find(d => m[1] === d[2]);
-           let syncTags = {};
+               if (selected.length > 1) {
+                 geometry = null;
+                 closed = null;
+                 centroid = null;
+               }
 
-           if (l) {
-             // Normalize title http://www.mediawiki.org/wiki/API:Query#Title_normalization
-             value = decodeURIComponent(m[2]).replace(/_/g, ' ');
-             if (m[3]) {
-               let anchor;
-               // try {
-               // leave this out for now - #6232
-                 // Best-effort `anchordecode:` implementation
-                 // anchor = decodeURIComponent(m[3].replace(/\.([0-9A-F]{2})/g, '%$1'));
-               // } catch (e) {
-               anchor = decodeURIComponent(m[3]);
-               // }
-               value += '#' + anchor.replace(/_/g, ' ');
+               if (selected.length === 2 && selected[0].type === 'node' && selected[1].type === 'node') {
+                 distance = geoSphericalDistance(selected[0].loc, selected[1].loc);
+               }
+
+               if (selected.length === 1 && selected[0].type === 'node') {
+                 location = selected[0].loc;
+               } else {
+                 totalNodeCount = utilGetAllNodes(selectedIDs, context.graph()).length;
+               }
+
+               if (!location && !centroid) {
+                 center = extent.center();
+               }
              }
-             value = value.slice(0, 1).toUpperCase() + value.slice(1);
-             utilGetSetValue(_langInput, l[1]);
-             utilGetSetValue(_titleInput, value);
            }
 
-           if (value) {
-             syncTags.wikipedia = context.cleanTagValue(language()[2] + ':' + value);
-           } else {
-             syncTags.wikipedia = undefined;
-           }
+           selection.html('');
 
-           dispatch$1.call('change', this, syncTags);
+           if (heading) {
+             selection.append('h4').attr('class', 'measurement-heading').html(heading);
+           }
 
+           var list = selection.append('ul');
+           var coordItem;
 
-           if (skipWikidata || !value || !language()[2]) return;
+           if (geometry) {
+             list.append('li').html(_t.html('info_panels.measurement.geometry') + ':').append('span').html(closed ? _t('info_panels.measurement.closed_' + geometry) : _t('geometry.' + geometry));
+           }
 
-           // attempt asynchronous update of wikidata tag..
-           const initGraph = context.graph();
-           const initEntityIDs = _entityIDs;
+           if (totalNodeCount) {
+             list.append('li').html(_t.html('info_panels.measurement.node_count') + ':').append('span').html(totalNodeCount.toLocaleString(localeCode));
+           }
 
-           wikidata.itemsByTitle(language()[2], value, (err, data) => {
-             if (err || !data || !Object.keys(data).length) return;
+           if (area) {
+             list.append('li').html(_t.html('info_panels.measurement.area') + ':').append('span').html(displayArea(area, _isImperial));
+           }
 
-             // If graph has changed, we can't apply this update.
-             if (context.graph() !== initGraph) return;
+           if (length) {
+             list.append('li').html(_t.html('info_panels.measurement.' + (closed ? 'perimeter' : 'length')) + ':').append('span').html(displayLength(length, _isImperial));
+           }
 
-             const qids = Object.keys(data);
-             const value = qids && qids.find(id => id.match(/^Q\d+$/));
+           if (typeof distance === 'number') {
+             list.append('li').html(_t.html('info_panels.measurement.distance') + ':').append('span').html(displayLength(distance, _isImperial));
+           }
 
-             let actions = initEntityIDs.map((entityID) => {
-               let entity = context.entity(entityID).tags;
-               let currTags = Object.assign({}, entity);  // shallow copy
-               if (currTags.wikidata !== value) {
-                   currTags.wikidata = value;
-                   return actionChangeTags(entityID, currTags);
-               }
-             }).filter(Boolean);
+           if (location) {
+             coordItem = list.append('li').html(_t.html('info_panels.measurement.location') + ':');
+             coordItem.append('span').html(dmsCoordinatePair(location));
+             coordItem.append('span').html(decimalCoordinatePair(location));
+           }
 
-             if (!actions.length) return;
+           if (centroid) {
+             coordItem = list.append('li').html(_t.html('info_panels.measurement.centroid') + ':');
+             coordItem.append('span').html(dmsCoordinatePair(centroid));
+             coordItem.append('span').html(decimalCoordinatePair(centroid));
+           }
 
-             // Coalesce the update of wikidata tag into the previous tag change
-             context.overwrite(
-               function actionUpdateWikidataTags(graph) {
-                 actions.forEach(function(action) {
-                   graph = action(graph);
-                 });
-                 return graph;
-               },
-               context.history().undoAnnotation()
-             );
+           if (center) {
+             coordItem = list.append('li').html(_t.html('info_panels.measurement.center') + ':');
+             coordItem.append('span').html(dmsCoordinatePair(center));
+             coordItem.append('span').html(decimalCoordinatePair(center));
+           }
 
-             // do not dispatch.call('change') here, because entity_editor
-             // changeTags() is not intended to be called asynchronously
-           });
+           if (length || area || typeof distance === 'number') {
+             var toggle = _isImperial ? 'imperial' : 'metric';
+             selection.append('a').html(_t.html('info_panels.measurement.' + toggle)).attr('href', '#').attr('class', 'button button-toggle-units').on('click', function (d3_event) {
+               d3_event.preventDefault();
+               _isImperial = !_isImperial;
+               selection.call(redraw);
+             });
+           }
          }
 
+         var panel = function panel(selection) {
+           selection.call(redraw);
+           context.map().on('drawn.info-measurement', function () {
+             selection.call(redraw);
+           });
+           context.on('enter.info-measurement', function () {
+             selection.call(redraw);
+           });
+         };
 
-         wiki.tags = (tags) => {
-           _tags = tags;
-           updateForTags(tags);
+         panel.off = function () {
+           context.map().on('drawn.info-measurement', null);
+           context.on('enter.info-measurement', null);
          };
 
-         function updateForTags(tags) {
+         panel.id = 'measurement';
+         panel.label = _t.html('info_panels.measurement.title');
+         panel.key = _t('info_panels.measurement.key');
+         return panel;
+       }
+
+       var uiInfoPanels = {
+         background: uiPanelBackground,
+         history: uiPanelHistory,
+         location: uiPanelLocation,
+         measurement: uiPanelMeasurement
+       };
 
-           const value = typeof tags[field.key] === 'string' ? tags[field.key] : '';
-           const m = value.match(/([^:]+):([^#]+)(?:#(.+))?/);
-           const l = m && _dataWikipedia.find(d => m[1] === d[2]);
-           let anchor = m && m[3];
+       function uiInfo(context) {
+         var ids = Object.keys(uiInfoPanels);
+         var wasActive = ['measurement'];
+         var panels = {};
+         var active = {}; // create panels
 
-           // value in correct format
-           if (l) {
-             utilGetSetValue(_langInput, l[1]);
-             utilGetSetValue(_titleInput, m[2] + (anchor ? ('#' + anchor) : ''));
-             if (anchor) {
-               try {
-                 // Best-effort `anchorencode:` implementation
-                 anchor = encodeURIComponent(anchor.replace(/ /g, '_')).replace(/%/g, '.');
-               } catch (e) {
-                 anchor = anchor.replace(/ /g, '_');
+         ids.forEach(function (k) {
+           if (!panels[k]) {
+             panels[k] = uiInfoPanels[k](context);
+             active[k] = false;
+           }
+         });
+
+         function info(selection) {
+           function redraw() {
+             var activeids = ids.filter(function (k) {
+               return active[k];
+             }).sort();
+             var containers = infoPanels.selectAll('.panel-container').data(activeids, function (k) {
+               return k;
+             });
+             containers.exit().style('opacity', 1).transition().duration(200).style('opacity', 0).on('end', function (d) {
+               select(this).call(panels[d].off).remove();
+             });
+             var enter = containers.enter().append('div').attr('class', function (d) {
+               return 'fillD2 panel-container panel-container-' + d;
+             });
+             enter.style('opacity', 0).transition().duration(200).style('opacity', 1);
+             var title = enter.append('div').attr('class', 'panel-title fillD2');
+             title.append('h3').html(function (d) {
+               return panels[d].label;
+             });
+             title.append('button').attr('class', 'close').on('click', function (d3_event, d) {
+               d3_event.stopImmediatePropagation();
+               d3_event.preventDefault();
+               info.toggle(d);
+             }).call(svgIcon('#iD-icon-close'));
+             enter.append('div').attr('class', function (d) {
+               return 'panel-content panel-content-' + d;
+             }); // redraw the panels
+
+             infoPanels.selectAll('.panel-content').each(function (d) {
+               select(this).call(panels[d]);
+             });
+           }
+
+           info.toggle = function (which) {
+             var activeids = ids.filter(function (k) {
+               return active[k];
+             });
+
+             if (which) {
+               // toggle one
+               active[which] = !active[which];
+
+               if (activeids.length === 1 && activeids[0] === which) {
+                 // none active anymore
+                 wasActive = [which];
                }
-             }
-             _wikiURL = 'https://' + m[1] + '.wikipedia.org/wiki/' +
-               m[2].replace(/ /g, '_') + (anchor ? ('#' + anchor) : '');
 
-           // unrecognized value format
-           } else {
-             utilGetSetValue(_titleInput, value);
-             if (value && value !== '') {
-               utilGetSetValue(_langInput, '');
-               _wikiURL = `https://en.wikipedia.org/wiki/Special:Search?search=${value}`;
+               context.container().select('.' + which + '-panel-toggle-item').classed('active', active[which]).select('input').property('checked', active[which]);
              } else {
-               _wikiURL = '';
+               // toggle all
+               if (activeids.length) {
+                 wasActive = activeids;
+                 activeids.forEach(function (k) {
+                   active[k] = false;
+                 });
+               } else {
+                 wasActive.forEach(function (k) {
+                   active[k] = true;
+                 });
+               }
              }
-           }
+
+             redraw();
+           };
+
+           var infoPanels = selection.selectAll('.info-panels').data([0]);
+           infoPanels = infoPanels.enter().append('div').attr('class', 'info-panels').merge(infoPanels);
+           redraw();
+           context.keybinding().on(uiCmd('⌘' + _t('info_panels.key')), function (d3_event) {
+             d3_event.stopImmediatePropagation();
+             d3_event.preventDefault();
+             info.toggle();
+           });
+           ids.forEach(function (k) {
+             var key = _t('info_panels.' + k + '.key', {
+               "default": null
+             });
+             if (!key) return;
+             context.keybinding().on(uiCmd('⌘⇧' + key), function (d3_event) {
+               d3_event.stopImmediatePropagation();
+               d3_event.preventDefault();
+               info.toggle(k);
+             });
+           });
          }
 
+         return info;
+       }
 
-         wiki.entityIDs = (val) => {
-           if (!arguments.length) return _entityIDs;
-           _entityIDs = val;
-           return wiki;
+       function pointBox(loc, context) {
+         var rect = context.surfaceRect();
+         var point = context.curtainProjection(loc);
+         return {
+           left: point[0] + rect.left - 40,
+           top: point[1] + rect.top - 60,
+           width: 80,
+           height: 90
          };
+       }
+       function pad(locOrBox, padding, context) {
+         var box;
 
+         if (locOrBox instanceof Array) {
+           var rect = context.surfaceRect();
+           var point = context.curtainProjection(locOrBox);
+           box = {
+             left: point[0] + rect.left,
+             top: point[1] + rect.top
+           };
+         } else {
+           box = locOrBox;
+         }
 
-         wiki.focus = () => {
-           _titleInput.node().focus();
+         return {
+           left: box.left - padding,
+           top: box.top - padding,
+           width: (box.width || 0) + 2 * padding,
+           height: (box.width || 0) + 2 * padding
          };
+       }
+       function icon(name, svgklass, useklass) {
+         return '<svg class="icon ' + (svgklass || '') + '">' + '<use xlink:href="' + name + '"' + (useklass ? ' class="' + useklass + '"' : '') + '></use></svg>';
+       }
+       var helpStringReplacements; // Returns the localized HTML element for `id` with a standardized set of icon, key, and
+       // label replacements suitable for tutorials and documentation. Optionally supplemented
+       // with custom `replacements`
+
+       function helpHtml(id, replacements) {
+         // only load these the first time
+         if (!helpStringReplacements) helpStringReplacements = {
+           // insert icons corresponding to various UI elements
+           point_icon: icon('#iD-icon-point', 'inline'),
+           line_icon: icon('#iD-icon-line', 'inline'),
+           area_icon: icon('#iD-icon-area', 'inline'),
+           note_icon: icon('#iD-icon-note', 'inline add-note'),
+           plus: icon('#iD-icon-plus', 'inline'),
+           minus: icon('#iD-icon-minus', 'inline'),
+           layers_icon: icon('#iD-icon-layers', 'inline'),
+           data_icon: icon('#iD-icon-data', 'inline'),
+           inspect: icon('#iD-icon-inspect', 'inline'),
+           help_icon: icon('#iD-icon-help', 'inline'),
+           undo_icon: icon(_mainLocalizer.textDirection() === 'rtl' ? '#iD-icon-redo' : '#iD-icon-undo', 'inline'),
+           redo_icon: icon(_mainLocalizer.textDirection() === 'rtl' ? '#iD-icon-undo' : '#iD-icon-redo', 'inline'),
+           save_icon: icon('#iD-icon-save', 'inline'),
+           // operation icons
+           circularize_icon: icon('#iD-operation-circularize', 'inline operation'),
+           continue_icon: icon('#iD-operation-continue', 'inline operation'),
+           copy_icon: icon('#iD-operation-copy', 'inline operation'),
+           delete_icon: icon('#iD-operation-delete', 'inline operation'),
+           disconnect_icon: icon('#iD-operation-disconnect', 'inline operation'),
+           downgrade_icon: icon('#iD-operation-downgrade', 'inline operation'),
+           extract_icon: icon('#iD-operation-extract', 'inline operation'),
+           merge_icon: icon('#iD-operation-merge', 'inline operation'),
+           move_icon: icon('#iD-operation-move', 'inline operation'),
+           orthogonalize_icon: icon('#iD-operation-orthogonalize', 'inline operation'),
+           paste_icon: icon('#iD-operation-paste', 'inline operation'),
+           reflect_long_icon: icon('#iD-operation-reflect-long', 'inline operation'),
+           reflect_short_icon: icon('#iD-operation-reflect-short', 'inline operation'),
+           reverse_icon: icon('#iD-operation-reverse', 'inline operation'),
+           rotate_icon: icon('#iD-operation-rotate', 'inline operation'),
+           split_icon: icon('#iD-operation-split', 'inline operation'),
+           straighten_icon: icon('#iD-operation-straighten', 'inline operation'),
+           // interaction icons
+           leftclick: icon('#iD-walkthrough-mouse-left', 'inline operation'),
+           rightclick: icon('#iD-walkthrough-mouse-right', 'inline operation'),
+           mousewheel_icon: icon('#iD-walkthrough-mousewheel', 'inline operation'),
+           tap_icon: icon('#iD-walkthrough-tap', 'inline operation'),
+           doubletap_icon: icon('#iD-walkthrough-doubletap', 'inline operation'),
+           longpress_icon: icon('#iD-walkthrough-longpress', 'inline operation'),
+           touchdrag_icon: icon('#iD-walkthrough-touchdrag', 'inline operation'),
+           pinch_icon: icon('#iD-walkthrough-pinch-apart', 'inline operation'),
+           // insert keys; may be localized and platform-dependent
+           shift: uiCmd.display('⇧'),
+           alt: uiCmd.display('⌥'),
+           "return": uiCmd.display('↵'),
+           esc: _t.html('shortcuts.key.esc'),
+           space: _t.html('shortcuts.key.space'),
+           add_note_key: _t.html('modes.add_note.key'),
+           help_key: _t.html('help.key'),
+           shortcuts_key: _t.html('shortcuts.toggle.key'),
+           // reference localized UI labels directly so that they'll always match
+           save: _t.html('save.title'),
+           undo: _t.html('undo.title'),
+           redo: _t.html('redo.title'),
+           upload: _t.html('commit.save'),
+           point: _t.html('modes.add_point.title'),
+           line: _t.html('modes.add_line.title'),
+           area: _t.html('modes.add_area.title'),
+           note: _t.html('modes.add_note.label'),
+           circularize: _t.html('operations.circularize.title'),
+           "continue": _t.html('operations.continue.title'),
+           copy: _t.html('operations.copy.title'),
+           "delete": _t.html('operations.delete.title'),
+           disconnect: _t.html('operations.disconnect.title'),
+           downgrade: _t.html('operations.downgrade.title'),
+           extract: _t.html('operations.extract.title'),
+           merge: _t.html('operations.merge.title'),
+           move: _t.html('operations.move.title'),
+           orthogonalize: _t.html('operations.orthogonalize.title'),
+           paste: _t.html('operations.paste.title'),
+           reflect_long: _t.html('operations.reflect.title.long'),
+           reflect_short: _t.html('operations.reflect.title.short'),
+           reverse: _t.html('operations.reverse.title'),
+           rotate: _t.html('operations.rotate.title'),
+           split: _t.html('operations.split.title'),
+           straighten: _t.html('operations.straighten.title'),
+           map_data: _t.html('map_data.title'),
+           osm_notes: _t.html('map_data.layers.notes.title'),
+           fields: _t.html('inspector.fields'),
+           tags: _t.html('inspector.tags'),
+           relations: _t.html('inspector.relations'),
+           new_relation: _t.html('inspector.new_relation'),
+           turn_restrictions: _t.html('presets.fields.restrictions.label'),
+           background_settings: _t.html('background.description'),
+           imagery_offset: _t.html('background.fix_misalignment'),
+           start_the_walkthrough: _t.html('splash.walkthrough'),
+           help: _t.html('help.title'),
+           ok: _t.html('intro.ok')
+         };
+         var reps;
+
+         if (replacements) {
+           reps = Object.assign(replacements, helpStringReplacements);
+         } else {
+           reps = helpStringReplacements;
+         }
 
+         return _t.html(id, reps) // use keyboard key styling for shortcuts
+         .replace(/\`(.*?)\`/g, '<kbd>$1</kbd>');
+       }
 
-         return utilRebind(wiki, dispatch$1, 'on');
+       function slugify(text) {
+         return text.toString().toLowerCase().replace(/\s+/g, '-') // Replace spaces with -
+         .replace(/[^\w\-]+/g, '') // Remove all non-word chars
+         .replace(/\-\-+/g, '-') // Replace multiple - with single -
+         .replace(/^-+/, '') // Trim - from start of text
+         .replace(/-+$/, ''); // Trim - from end of text
+       } // console warning for missing walkthrough names
+
+
+       var missingStrings = {};
+
+       function checkKey(key, text) {
+         if (_t(key, {
+           "default": undefined
+         }) === undefined) {
+           if (missingStrings.hasOwnProperty(key)) return; // warn once
+
+           missingStrings[key] = text;
+           var missing = key + ': ' + text;
+           if (typeof console !== 'undefined') console.log(missing); // eslint-disable-line
+         }
        }
 
-       uiFieldWikipedia.supportsMultiselection = false;
+       function localize(obj) {
+         var key; // Assign name if entity has one..
 
-       var uiFields = {
-           access: uiFieldAccess,
-           address: uiFieldAddress,
-           check: uiFieldCheck,
-           combo: uiFieldCombo,
-           cycleway: uiFieldCycleway,
-           defaultCheck: uiFieldCheck,
-           email: uiFieldText,
-           identifier: uiFieldText,
-           lanes: uiFieldLanes,
-           localized: uiFieldLocalized,
-           maxspeed: uiFieldMaxspeed,
-           multiCombo: uiFieldCombo,
-           networkCombo: uiFieldCombo,
-           number: uiFieldText,
-           onewayCheck: uiFieldCheck,
-           radio: uiFieldRadio,
-           restrictions: uiFieldRestrictions,
-           semiCombo: uiFieldCombo,
-           structureRadio: uiFieldRadio,
-           tel: uiFieldText,
-           text: uiFieldText,
-           textarea: uiFieldTextarea,
-           typeCombo: uiFieldCombo,
-           url: uiFieldText,
-           wikidata: uiFieldWikidata,
-           wikipedia: uiFieldWikipedia
-       };
+         var name = obj.tags && obj.tags.name;
 
-       function uiField(context, presetField, entityIDs, options) {
-           options = Object.assign({
-               show: true,
-               wrap: true,
-               remove: true,
-               revert: true,
-               info: true
-           }, options);
+         if (name) {
+           key = 'intro.graph.name.' + slugify(name);
+           obj.tags.name = _t(key, {
+             "default": name
+           });
+           checkKey(key, name);
+         } // Assign street name if entity has one..
+
+
+         var street = obj.tags && obj.tags['addr:street'];
+
+         if (street) {
+           key = 'intro.graph.name.' + slugify(street);
+           obj.tags['addr:street'] = _t(key, {
+             "default": street
+           });
+           checkKey(key, street); // Add address details common across walkthrough..
+
+           var addrTags = ['block_number', 'city', 'county', 'district', 'hamlet', 'neighbourhood', 'postcode', 'province', 'quarter', 'state', 'subdistrict', 'suburb'];
+           addrTags.forEach(function (k) {
+             var key = 'intro.graph.' + k;
+             var tag = 'addr:' + k;
+             var val = obj.tags && obj.tags[tag];
+             var str = _t(key, {
+               "default": val
+             });
+
+             if (str) {
+               if (str.match(/^<.*>$/) !== null) {
+                 delete obj.tags[tag];
+               } else {
+                 obj.tags[tag] = str;
+               }
+             }
+           });
+         }
+
+         return obj;
+       } // Used to detect squareness.. some duplicataion of code from actionOrthogonalize.
 
-           var dispatch$1 = dispatch('change', 'revert');
-           var field = Object.assign({}, presetField);   // shallow copy
-           field.domId = utilUniqueDomId('form-field-' + field.safeid);
-           var _show = options.show;
-           var _state = '';
-           var _tags = {};
+       function isMostlySquare(points) {
+         // note: uses 15 here instead of the 12 from actionOrthogonalize because
+         // actionOrthogonalize can actually straighten some larger angles as it iterates
+         var threshold = 15; // degrees within right or straight
 
-           var _locked = false;
-           var _lockedTip = uiTooltip()
-               .title(_t('inspector.lock.suggestion', { label: field.label }))
-               .placement('bottom');
+         var lowerBound = Math.cos((90 - threshold) * Math.PI / 180); // near right
 
+         var upperBound = Math.cos(threshold * Math.PI / 180); // near straight
 
-           field.keys = field.keys || [field.key];
+         for (var i = 0; i < points.length; i++) {
+           var a = points[(i - 1 + points.length) % points.length];
+           var origin = points[i];
+           var b = points[(i + 1) % points.length];
+           var dotp = geoVecNormalizedDot(a, b, origin);
+           var mag = Math.abs(dotp);
 
-           // only create the fields that are actually being shown
-           if (_show && !field.impl) {
-               createField();
+           if (mag > lowerBound && mag < upperBound) {
+             return false;
            }
+         }
 
-           // Creates the field.. This is done lazily,
-           // once we know that the field will be shown.
-           function createField() {
-               field.impl = uiFields[field.type](field, context)
-                   .on('change', function(t, onInput) {
-                       dispatch$1.call('change', field, t, onInput);
-                   });
+         return true;
+       }
+       function selectMenuItem(context, operation) {
+         return context.container().select('.edit-menu .edit-menu-item-' + operation);
+       }
+       function transitionTime(point1, point2) {
+         var distance = geoSphericalDistance(point1, point2);
+         if (distance === 0) return 0;else if (distance < 80) return 500;else return 1000;
+       }
 
-               if (entityIDs) {
-                   field.entityIDs = entityIDs;
-                   // if this field cares about the entities, pass them along
-                   if (field.impl.entityIDs) {
-                       field.impl.entityIDs(entityIDs);
-                   }
-               }
-           }
+       function uiCurtain(containerNode) {
+         var surface = select(null),
+             tooltip = select(null),
+             darkness = select(null);
 
+         function curtain(selection) {
+           surface = selection.append('svg').attr('class', 'curtain').style('top', 0).style('left', 0);
+           darkness = surface.append('path').attr('x', 0).attr('y', 0).attr('class', 'curtain-darkness');
+           select(window).on('resize.curtain', resize);
+           tooltip = selection.append('div').attr('class', 'tooltip');
+           tooltip.append('div').attr('class', 'popover-arrow');
+           tooltip.append('div').attr('class', 'popover-inner');
+           resize();
 
-           function isModified() {
-               if (!entityIDs || !entityIDs.length) return false;
-               return entityIDs.some(function(entityID) {
-                   var original = context.graph().base().entities[entityID];
-                   var latest = context.graph().entity(entityID);
-                   return field.keys.some(function(key) {
-                       return original ? latest.tags[key] !== original.tags[key] : latest.tags[key];
-                   });
-               });
+           function resize() {
+             surface.attr('width', containerNode.clientWidth).attr('height', containerNode.clientHeight);
+             curtain.cut(darkness.datum());
            }
+         }
+         /**
+          * Reveal cuts the curtain to highlight the given box,
+          * and shows a tooltip with instructions next to the box.
+          *
+          * @param  {String|ClientRect} [box]   box used to cut the curtain
+          * @param  {String}    [text]          text for a tooltip
+          * @param  {Object}    [options]
+          * @param  {string}    [options.tooltipClass]    optional class to add to the tooltip
+          * @param  {integer}   [options.duration]        transition time in milliseconds
+          * @param  {string}    [options.buttonText]      if set, create a button with this text label
+          * @param  {function}  [options.buttonCallback]  if set, the callback for the button
+          * @param  {function}  [options.padding]         extra margin in px to put around bbox
+          * @param  {String|ClientRect} [options.tooltipBox]  box for tooltip position, if different from box for the curtain
+          */
 
 
-           function tagsContainFieldKey() {
-               return field.keys.some(function(key) {
-                   if (field.type === 'multiCombo') {
-                       for (var tagKey in _tags) {
-                           if (tagKey.indexOf(key) === 0) {
-                               return true;
-                           }
-                       }
-                       return false;
-                   }
-                   return _tags[key] !== undefined;
-               });
-           }
+         curtain.reveal = function (box, html, options) {
+           options = options || {};
 
+           if (typeof box === 'string') {
+             box = select(box).node();
+           }
 
-           function revert(d) {
-               event.stopPropagation();
-               event.preventDefault();
-               if (!entityIDs || _locked) return;
+           if (box && box.getBoundingClientRect) {
+             box = copyBox(box.getBoundingClientRect());
+             var containerRect = containerNode.getBoundingClientRect();
+             box.top -= containerRect.top;
+             box.left -= containerRect.left;
+           }
 
-               dispatch$1.call('revert', d, d.keys);
+           if (box && options.padding) {
+             box.top -= options.padding;
+             box.left -= options.padding;
+             box.bottom += options.padding;
+             box.right += options.padding;
+             box.height += options.padding * 2;
+             box.width += options.padding * 2;
            }
 
+           var tooltipBox;
 
-           function remove(d) {
-               event.stopPropagation();
-               event.preventDefault();
-               if (_locked) return;
+           if (options.tooltipBox) {
+             tooltipBox = options.tooltipBox;
 
-               var t = {};
-               d.keys.forEach(function(key) {
-                   t[key] = undefined;
-               });
+             if (typeof tooltipBox === 'string') {
+               tooltipBox = select(tooltipBox).node();
+             }
 
-               dispatch$1.call('change', d, t);
+             if (tooltipBox && tooltipBox.getBoundingClientRect) {
+               tooltipBox = copyBox(tooltipBox.getBoundingClientRect());
+             }
+           } else {
+             tooltipBox = box;
            }
 
+           if (tooltipBox && html) {
+             if (html.indexOf('**') !== -1) {
+               if (html.indexOf('<span') === 0) {
+                 html = html.replace(/^(<span.*?>)(.+?)(\*\*)/, '$1<span>$2</span>$3');
+               } else {
+                 html = html.replace(/^(.+?)(\*\*)/, '<span>$1</span>$2');
+               } // pseudo markdown bold text for the instruction section..
 
-           field.render = function(selection) {
-               var container = selection.selectAll('.form-field')
-                   .data([field]);
 
-               // Enter
-               var enter = container.enter()
-                   .append('div')
-                   .attr('class', function(d) { return 'form-field form-field-' + d.safeid; })
-                   .classed('nowrap', !options.wrap);
-
-               if (options.wrap) {
-                   var labelEnter = enter
-                       .append('label')
-                       .attr('class', 'field-label')
-                       .attr('for', function(d) { return d.domId; });
-
-                   var textEnter = labelEnter
-                       .append('span')
-                       .attr('class', 'label-text');
-
-                   textEnter
-                       .append('span')
-                       .attr('class', 'label-textvalue')
-                       .text(function(d) { return d.label(); });
-
-                   textEnter
-                       .append('span')
-                       .attr('class', 'label-textannotation');
-
-                   if (options.remove) {
-                       labelEnter
-                           .append('button')
-                           .attr('class', 'remove-icon')
-                           .attr('title', _t('icons.remove'))
-                           .attr('tabindex', -1)
-                           .call(svgIcon('#iD-operation-delete'));
-                   }
+               html = html.replace(/\*\*(.*?)\*\*/g, '<span class="instruction">$1</span>');
+             }
 
-                   if (options.revert) {
-                       labelEnter
-                           .append('button')
-                           .attr('class', 'modified-icon')
-                           .attr('title', _t('icons.undo'))
-                           .attr('tabindex', -1)
-                           .call(svgIcon((_mainLocalizer.textDirection() === 'rtl') ? '#iD-icon-redo' : '#iD-icon-undo'));
-                   }
-               }
+             html = html.replace(/\*(.*?)\*/g, '<em>$1</em>'); // emphasis
 
+             html = html.replace(/\{br\}/g, '<br/><br/>'); // linebreak
 
-               // Update
-               container = container
-                   .merge(enter);
+             if (options.buttonText && options.buttonCallback) {
+               html += '<div class="button-section">' + '<button href="#" class="button action">' + options.buttonText + '</button></div>';
+             }
 
-               container.select('.field-label > .remove-icon')  // propagate bound data
-                   .on('click', remove);
+             var classes = 'curtain-tooltip popover tooltip arrowed in ' + (options.tooltipClass || '');
+             tooltip.classed(classes, true).selectAll('.popover-inner').html(html);
 
-               container.select('.field-label > .modified-icon')  // propagate bound data
-                   .on('click', revert);
+             if (options.buttonText && options.buttonCallback) {
+               var button = tooltip.selectAll('.button-section .button.action');
+               button.on('click', function (d3_event) {
+                 d3_event.preventDefault();
+                 options.buttonCallback();
+               });
+             }
 
-               container
-                   .each(function(d) {
-                       var selection = select(this);
+             var tip = copyBox(tooltip.node().getBoundingClientRect()),
+                 w = containerNode.clientWidth,
+                 h = containerNode.clientHeight,
+                 tooltipWidth = 200,
+                 tooltipArrow = 5,
+                 side,
+                 pos; // hack: this will have bottom placement,
+             // so need to reserve extra space for the tooltip illustration.
 
-                       if (!d.impl) {
-                           createField();
-                       }
+             if (options.tooltipClass === 'intro-mouse') {
+               tip.height += 80;
+             } // trim box dimensions to just the portion that fits in the container..
 
-                       var reference, help;
 
-                       // instantiate field help
-                       if (options.wrap && field.type === 'restrictions') {
-                           help = uiFieldHelp(context, 'restrictions');
-                       }
+             if (tooltipBox.top + tooltipBox.height > h) {
+               tooltipBox.height -= tooltipBox.top + tooltipBox.height - h;
+             }
 
-                       // instantiate tag reference
-                       if (options.wrap && options.info) {
-                           var referenceKey = d.key;
-                           if (d.type === 'multiCombo') {   // lookup key without the trailing ':'
-                               referenceKey = referenceKey.replace(/:$/, '');
-                           }
+             if (tooltipBox.left + tooltipBox.width > w) {
+               tooltipBox.width -= tooltipBox.left + tooltipBox.width - w;
+             } // determine tooltip placement..
 
-                           reference = uiTagReference(d.reference || { key: referenceKey });
-                           if (_state === 'hover') {
-                               reference.showing(false);
-                           }
-                       }
 
-                       selection
-                           .call(d.impl);
+             if (tooltipBox.top + tooltipBox.height < 100) {
+               // tooltip below box..
+               side = 'bottom';
+               pos = [tooltipBox.left + tooltipBox.width / 2 - tip.width / 2, tooltipBox.top + tooltipBox.height];
+             } else if (tooltipBox.top > h - 140) {
+               // tooltip above box..
+               side = 'top';
+               pos = [tooltipBox.left + tooltipBox.width / 2 - tip.width / 2, tooltipBox.top - tip.height];
+             } else {
+               // tooltip to the side of the tooltipBox..
+               var tipY = tooltipBox.top + tooltipBox.height / 2 - tip.height / 2;
 
-                       // add field help components
-                       if (help) {
-                           selection
-                               .call(help.body)
-                               .select('.field-label')
-                               .call(help.button);
-                       }
+               if (_mainLocalizer.textDirection() === 'rtl') {
+                 if (tooltipBox.left - tooltipWidth - tooltipArrow < 70) {
+                   side = 'right';
+                   pos = [tooltipBox.left + tooltipBox.width + tooltipArrow, tipY];
+                 } else {
+                   side = 'left';
+                   pos = [tooltipBox.left - tooltipWidth - tooltipArrow, tipY];
+                 }
+               } else {
+                 if (tooltipBox.left + tooltipBox.width + tooltipArrow + tooltipWidth > w - 70) {
+                   side = 'left';
+                   pos = [tooltipBox.left - tooltipWidth - tooltipArrow, tipY];
+                 } else {
+                   side = 'right';
+                   pos = [tooltipBox.left + tooltipBox.width + tooltipArrow, tipY];
+                 }
+               }
+             }
 
-                       // add tag reference components
-                       if (reference) {
-                           selection
-                               .call(reference.body)
-                               .select('.field-label')
-                               .call(reference.button);
-                       }
+             if (options.duration !== 0 || !tooltip.classed(side)) {
+               tooltip.call(uiToggle(true));
+             }
 
-                       d.impl.tags(_tags);
-                   });
+             tooltip.style('top', pos[1] + 'px').style('left', pos[0] + 'px').attr('class', classes + ' ' + side); // shift popover-inner if it is very close to the top or bottom edge
+             // (doesn't affect the placement of the popover-arrow)
 
+             var shiftY = 0;
+
+             if (side === 'left' || side === 'right') {
+               if (pos[1] < 60) {
+                 shiftY = 60 - pos[1];
+               } else if (pos[1] + tip.height > h - 100) {
+                 shiftY = h - pos[1] - tip.height - 100;
+               }
+             }
 
-                   container
-                       .classed('locked', _locked)
-                       .classed('modified', isModified())
-                       .classed('present', tagsContainFieldKey());
+             tooltip.selectAll('.popover-inner').style('top', shiftY + 'px');
+           } else {
+             tooltip.classed('in', false).call(uiToggle(false));
+           }
 
+           curtain.cut(box, options.duration);
+           return tooltip;
+         };
 
-                   // show a tip and lock icon if the field is locked
-                   var annotation = container.selectAll('.field-label .label-textannotation');
-                   var icon = annotation.selectAll('.icon')
-                       .data(_locked ? [0]: []);
+         curtain.cut = function (datum, duration) {
+           darkness.datum(datum).interrupt();
+           var selection;
 
-                   icon.exit()
-                       .remove();
+           if (duration === 0) {
+             selection = darkness;
+           } else {
+             selection = darkness.transition().duration(duration || 600).ease(linear$1);
+           }
 
-                   icon.enter()
-                       .append('svg')
-                       .attr('class', 'icon')
-                       .append('use')
-                       .attr('xlink:href', '#fas-lock');
+           selection.attr('d', function (d) {
+             var containerWidth = containerNode.clientWidth;
+             var containerHeight = containerNode.clientHeight;
+             var string = 'M 0,0 L 0,' + containerHeight + ' L ' + containerWidth + ',' + containerHeight + 'L' + containerWidth + ',0 Z';
+             if (!d) return string;
+             return string + 'M' + d.left + ',' + d.top + 'L' + d.left + ',' + (d.top + d.height) + 'L' + (d.left + d.width) + ',' + (d.top + d.height) + 'L' + (d.left + d.width) + ',' + d.top + 'Z';
+           });
+         };
 
-                   container.call(_locked ? _lockedTip : _lockedTip.destroy);
-           };
+         curtain.remove = function () {
+           surface.remove();
+           tooltip.remove();
+           select(window).on('resize.curtain', null);
+         }; // ClientRects are immutable, so copy them to an object,
+         // in case we need to trim the height/width.
 
 
-           field.state = function(val) {
-               if (!arguments.length) return _state;
-               _state = val;
-               return field;
+         function copyBox(src) {
+           return {
+             top: src.top,
+             right: src.right,
+             bottom: src.bottom,
+             left: src.left,
+             width: src.width,
+             height: src.height
            };
+         }
 
+         return curtain;
+       }
 
-           field.tags = function(val) {
-               if (!arguments.length) return _tags;
-               _tags = val;
+       function uiIntroWelcome(context, reveal) {
+         var dispatch$1 = dispatch('done');
+         var chapter = {
+           title: 'intro.welcome.title'
+         };
 
-               if (tagsContainFieldKey() && !_show) {
-                   // always show a field if it has a value to display
-                   _show = true;
-                   if (!field.impl) {
-                       createField();
-                   }
-               }
+         function welcome() {
+           context.map().centerZoom([-85.63591, 41.94285], 19);
+           reveal('.intro-nav-wrap .chapter-welcome', helpHtml('intro.welcome.welcome'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: practice
+           });
+         }
 
-               return field;
-           };
+         function practice() {
+           reveal('.intro-nav-wrap .chapter-welcome', helpHtml('intro.welcome.practice'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: words
+           });
+         }
 
+         function words() {
+           reveal('.intro-nav-wrap .chapter-welcome', helpHtml('intro.welcome.words'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: chapters
+           });
+         }
 
-           field.locked = function(val) {
-               if (!arguments.length) return _locked;
-               _locked = val;
-               return field;
-           };
+         function chapters() {
+           dispatch$1.call('done');
+           reveal('.intro-nav-wrap .chapter-navigation', helpHtml('intro.welcome.chapters', {
+             next: _t('intro.navigation.title')
+           }));
+         }
 
+         chapter.enter = function () {
+           welcome();
+         };
 
-           field.show = function() {
-               _show = true;
-               if (!field.impl) {
-                   createField();
-               }
-               if (field.default && field.key && _tags[field.key] !== field.default) {
-                   var t = {};
-                   t[field.key] = field.default;
-                   dispatch$1.call('change', this, t);
-               }
-           };
+         chapter.exit = function () {
+           context.container().select('.curtain-tooltip.intro-mouse').selectAll('.counter').remove();
+         };
 
-           // A shown field has a visible UI, a non-shown field is in the 'Add field' dropdown
-           field.isShown = function() {
-               return _show;
-           };
+         chapter.restart = function () {
+           chapter.exit();
+           chapter.enter();
+         };
 
+         return utilRebind(chapter, dispatch$1, 'on');
+       }
 
-           // An allowed field can appear in the UI or in the 'Add field' dropdown.
-           // A non-allowed field is hidden from the user altogether
-           field.isAllowed = function() {
+       function uiIntroNavigation(context, reveal) {
+         var dispatch$1 = dispatch('done');
+         var timeouts = [];
+         var hallId = 'n2061';
+         var townHall = [-85.63591, 41.94285];
+         var springStreetId = 'w397';
+         var springStreetEndId = 'n1834';
+         var springStreet = [-85.63582, 41.94255];
+         var onewayField = _mainPresetIndex.field('oneway');
+         var maxspeedField = _mainPresetIndex.field('maxspeed');
+         var chapter = {
+           title: 'intro.navigation.title'
+         };
 
-               if (entityIDs &&
-                   entityIDs.length > 1 &&
-                   uiFields[field.type].supportsMultiselection === false) return false;
+         function timeout(f, t) {
+           timeouts.push(window.setTimeout(f, t));
+         }
 
-               if (field.geometry && !entityIDs.every(function(entityID) {
-                   return field.matchGeometry(context.graph().geometry(entityID));
-               })) return false;
+         function eventCancel(d3_event) {
+           d3_event.stopPropagation();
+           d3_event.preventDefault();
+         }
 
-               if (field.countryCodes || field.notCountryCodes) {
-                   var extent = combinedEntityExtent();
-                   if (!extent) return true;
+         function isTownHallSelected() {
+           var ids = context.selectedIDs();
+           return ids.length === 1 && ids[0] === hallId;
+         }
 
-                   var center = extent.center();
-                   var countryCode = iso1A2Code(center);
+         function dragMap() {
+           context.enter(modeBrowse(context));
+           context.history().reset('initial');
+           var msec = transitionTime(townHall, context.map().center());
 
-                   if (!countryCode) return false;
+           if (msec) {
+             reveal(null, null, {
+               duration: 0
+             });
+           }
 
-                   countryCode = countryCode.toLowerCase();
+           context.map().centerZoomEase(townHall, 19, msec);
+           timeout(function () {
+             var centerStart = context.map().center();
+             var textId = context.lastPointerType() === 'mouse' ? 'drag' : 'drag_touch';
+             var dragString = helpHtml('intro.navigation.map_info') + '{br}' + helpHtml('intro.navigation.' + textId);
+             reveal('.surface', dragString);
+             context.map().on('drawn.intro', function () {
+               reveal('.surface', dragString, {
+                 duration: 0
+               });
+             });
+             context.map().on('move.intro', function () {
+               var centerNow = context.map().center();
 
-                   if (field.countryCodes && field.countryCodes.indexOf(countryCode) === -1) {
-                       return false;
-                   }
-                   if (field.notCountryCodes && field.notCountryCodes.indexOf(countryCode) !== -1) {
-                       return false;
-                   }
+               if (centerStart[0] !== centerNow[0] || centerStart[1] !== centerNow[1]) {
+                 context.map().on('move.intro', null);
+                 timeout(function () {
+                   continueTo(zoomMap);
+                 }, 3000);
                }
+             });
+           }, msec + 100);
 
-               var prerequisiteTag = field.prerequisiteTag;
-
-               if (entityIDs &&
-                   !tagsContainFieldKey() && // ignore tagging prerequisites if a value is already present
-                   prerequisiteTag) {
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             nextStep();
+           }
+         }
 
-                   if (!entityIDs.every(function(entityID) {
-                       var entity = context.graph().entity(entityID);
-                       if (prerequisiteTag.key) {
-                           var value = entity.tags[prerequisiteTag.key];
-                           if (!value) return false;
+         function zoomMap() {
+           var zoomStart = context.map().zoom();
+           var textId = context.lastPointerType() === 'mouse' ? 'zoom' : 'zoom_touch';
+           var zoomString = helpHtml('intro.navigation.' + textId);
+           reveal('.surface', zoomString);
+           context.map().on('drawn.intro', function () {
+             reveal('.surface', zoomString, {
+               duration: 0
+             });
+           });
+           context.map().on('move.intro', function () {
+             if (context.map().zoom() !== zoomStart) {
+               context.map().on('move.intro', null);
+               timeout(function () {
+                 continueTo(features);
+               }, 3000);
+             }
+           });
 
-                           if (prerequisiteTag.valueNot) {
-                               return prerequisiteTag.valueNot !== value;
-                           }
-                           if (prerequisiteTag.value) {
-                               return prerequisiteTag.value === value;
-                           }
-                       } else if (prerequisiteTag.keyNot) {
-                           if (entity.tags[prerequisiteTag.keyNot]) return false;
-                       }
-                       return true;
-                   })) return false;
-               }
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             nextStep();
+           }
+         }
 
-               return true;
+         function features() {
+           var onClick = function onClick() {
+             continueTo(pointsLinesAreas);
            };
 
+           reveal('.surface', helpHtml('intro.navigation.features'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: onClick
+           });
+           context.map().on('drawn.intro', function () {
+             reveal('.surface', helpHtml('intro.navigation.features'), {
+               duration: 0,
+               buttonText: _t.html('intro.ok'),
+               buttonCallback: onClick
+             });
+           });
+
+           function continueTo(nextStep) {
+             context.map().on('drawn.intro', null);
+             nextStep();
+           }
+         }
 
-           field.focus = function() {
-               if (field.impl) {
-                   field.impl.focus();
-               }
+         function pointsLinesAreas() {
+           var onClick = function onClick() {
+             continueTo(nodesWays);
            };
 
+           reveal('.surface', helpHtml('intro.navigation.points_lines_areas'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: onClick
+           });
+           context.map().on('drawn.intro', function () {
+             reveal('.surface', helpHtml('intro.navigation.points_lines_areas'), {
+               duration: 0,
+               buttonText: _t.html('intro.ok'),
+               buttonCallback: onClick
+             });
+           });
 
-           function combinedEntityExtent() {
-               return entityIDs && entityIDs.length && entityIDs.reduce(function(extent, entityID) {
-                   var entity = context.graph().entity(entityID);
-                   return extent.extend(entity.extent(context.graph()));
-               }, geoExtent());
+           function continueTo(nextStep) {
+             context.map().on('drawn.intro', null);
+             nextStep();
            }
+         }
 
+         function nodesWays() {
+           var onClick = function onClick() {
+             continueTo(clickTownHall);
+           };
 
-           return utilRebind(field, dispatch$1, 'on');
-       }
-
-       function uiFormFields(context) {
-           var moreCombo = uiCombobox(context, 'more-fields').minItems(1);
-           var _fieldsArr = [];
-           var _lastPlaceholder = '';
-           var _state = '';
-           var _klass = '';
+           reveal('.surface', helpHtml('intro.navigation.nodes_ways'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: onClick
+           });
+           context.map().on('drawn.intro', function () {
+             reveal('.surface', helpHtml('intro.navigation.nodes_ways'), {
+               duration: 0,
+               buttonText: _t.html('intro.ok'),
+               buttonCallback: onClick
+             });
+           });
 
+           function continueTo(nextStep) {
+             context.map().on('drawn.intro', null);
+             nextStep();
+           }
+         }
 
-           function formFields(selection) {
-               var allowedFields = _fieldsArr.filter(function(field) { return field.isAllowed(); });
-               var shown = allowedFields.filter(function(field) { return field.isShown(); });
-               var notShown = allowedFields.filter(function(field) { return !field.isShown(); });
+         function clickTownHall() {
+           context.enter(modeBrowse(context));
+           context.history().reset('initial');
+           var entity = context.hasEntity(hallId);
+           if (!entity) return;
+           reveal(null, null, {
+             duration: 0
+           });
+           context.map().centerZoomEase(entity.loc, 19, 500);
+           timeout(function () {
+             var entity = context.hasEntity(hallId);
+             if (!entity) return;
+             var box = pointBox(entity.loc, context);
+             var textId = context.lastPointerType() === 'mouse' ? 'click_townhall' : 'tap_townhall';
+             reveal(box, helpHtml('intro.navigation.' + textId));
+             context.map().on('move.intro drawn.intro', function () {
+               var entity = context.hasEntity(hallId);
+               if (!entity) return;
+               var box = pointBox(entity.loc, context);
+               reveal(box, helpHtml('intro.navigation.' + textId), {
+                 duration: 0
+               });
+             });
+             context.on('enter.intro', function () {
+               if (isTownHallSelected()) continueTo(selectedTownHall);
+             });
+           }, 550); // after centerZoomEase
 
-               var container = selection.selectAll('.form-fields-container')
-                   .data([0]);
+           context.history().on('change.intro', function () {
+             if (!context.hasEntity(hallId)) {
+               continueTo(clickTownHall);
+             }
+           });
 
-               container = container.enter()
-                   .append('div')
-                   .attr('class', 'form-fields-container ' + (_klass || ''))
-                   .merge(container);
+           function continueTo(nextStep) {
+             context.on('enter.intro', null);
+             context.map().on('move.intro drawn.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
+           }
+         }
 
+         function selectedTownHall() {
+           if (!isTownHallSelected()) return clickTownHall();
+           var entity = context.hasEntity(hallId);
+           if (!entity) return clickTownHall();
+           var box = pointBox(entity.loc, context);
 
-               var fields = container.selectAll('.wrap-form-field')
-                   .data(shown, function(d) { return d.id + (d.entityIDs ? d.entityIDs.join() : ''); });
+           var onClick = function onClick() {
+             continueTo(editorTownHall);
+           };
 
-               fields.exit()
-                   .remove();
+           reveal(box, helpHtml('intro.navigation.selected_townhall'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: onClick
+           });
+           context.map().on('move.intro drawn.intro', function () {
+             var entity = context.hasEntity(hallId);
+             if (!entity) return;
+             var box = pointBox(entity.loc, context);
+             reveal(box, helpHtml('intro.navigation.selected_townhall'), {
+               duration: 0,
+               buttonText: _t.html('intro.ok'),
+               buttonCallback: onClick
+             });
+           });
+           context.history().on('change.intro', function () {
+             if (!context.hasEntity(hallId)) {
+               continueTo(clickTownHall);
+             }
+           });
 
-               // Enter
-               var enter = fields.enter()
-                   .append('div')
-                   .attr('class', function(d) { return 'wrap-form-field wrap-form-field-' + d.safeid; });
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
+           }
+         }
 
-               // Update
-               fields = fields
-                   .merge(enter);
+         function editorTownHall() {
+           if (!isTownHallSelected()) return clickTownHall(); // disallow scrolling
 
-               fields
-                   .order()
-                   .each(function(d) {
-                       select(this)
-                           .call(d.render);
-                   });
+           context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
 
+           var onClick = function onClick() {
+             continueTo(presetTownHall);
+           };
 
-               var titles = [];
-               var moreFields = notShown.map(function(field) {
-                   var label = field.label();
-                   titles.push(label);
+           reveal('.entity-editor-pane', helpHtml('intro.navigation.editor_townhall'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: onClick
+           });
+           context.on('exit.intro', function () {
+             continueTo(clickTownHall);
+           });
+           context.history().on('change.intro', function () {
+             if (!context.hasEntity(hallId)) {
+               continueTo(clickTownHall);
+             }
+           });
 
-                   var terms = field.terms();
-                   if (field.key) terms.push(field.key);
-                   if (field.keys) terms = terms.concat(field.keys);
+           function continueTo(nextStep) {
+             context.on('exit.intro', null);
+             context.history().on('change.intro', null);
+             context.container().select('.inspector-wrap').on('wheel.intro', null);
+             nextStep();
+           }
+         }
 
-                   return {
-                       title: label,
-                       value: label,
-                       field: field,
-                       terms: terms
-                   };
-               });
+         function presetTownHall() {
+           if (!isTownHallSelected()) return clickTownHall(); // reset pane, in case user happened to change it..
 
-               var placeholder = titles.slice(0,3).join(', ') + ((titles.length > 3) ? '…' : '');
+           context.container().select('.inspector-wrap .panewrap').style('right', '0%'); // disallow scrolling
 
+           context.container().select('.inspector-wrap').on('wheel.intro', eventCancel); // preset match, in case the user happened to change it.
 
-               var more = selection.selectAll('.more-fields')
-                   .data((_state === 'hover' || moreFields.length === 0) ? [] : [0]);
+           var entity = context.entity(context.selectedIDs()[0]);
+           var preset = _mainPresetIndex.match(entity, context.graph());
 
-               more.exit()
-                   .remove();
+           var onClick = function onClick() {
+             continueTo(fieldsTownHall);
+           };
 
-               var moreEnter = more.enter()
-                   .append('div')
-                   .attr('class', 'more-fields')
-                   .append('label');
-
-               moreEnter
-                   .append('span')
-                   .text(_t('inspector.add_fields'));
-
-               more = moreEnter
-                   .merge(more);
-
-
-               var input = more.selectAll('.value')
-                   .data([0]);
-
-               input.exit()
-                   .remove();
-
-               input = input.enter()
-                   .append('input')
-                   .attr('class', 'value')
-                   .attr('type', 'text')
-                   .attr('placeholder', placeholder)
-                   .call(utilNoAuto)
-                   .merge(input);
-
-               input
-                   .call(utilGetSetValue, '')
-                   .call(moreCombo
-                       .data(moreFields)
-                       .on('accept', function (d) {
-                           if (!d) return;  // user entered something that was not matched
-                           var field = d.field;
-                           field.show();
-                           selection.call(formFields);  // rerender
-                           if (field.type !== 'semiCombo' && field.type !== 'multiCombo') {
-                               field.focus();
-                           }
-                       })
-                   );
+           reveal('.entity-editor-pane .section-feature-type', helpHtml('intro.navigation.preset_townhall', {
+             preset: preset.name()
+           }), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: onClick
+           });
+           context.on('exit.intro', function () {
+             continueTo(clickTownHall);
+           });
+           context.history().on('change.intro', function () {
+             if (!context.hasEntity(hallId)) {
+               continueTo(clickTownHall);
+             }
+           });
 
-               // avoid updating placeholder excessively (triggers style recalc)
-               if (_lastPlaceholder !== placeholder) {
-                   input.attr('placeholder', placeholder);
-                   _lastPlaceholder = placeholder;
-               }
+           function continueTo(nextStep) {
+             context.on('exit.intro', null);
+             context.history().on('change.intro', null);
+             context.container().select('.inspector-wrap').on('wheel.intro', null);
+             nextStep();
            }
+         }
 
+         function fieldsTownHall() {
+           if (!isTownHallSelected()) return clickTownHall(); // reset pane, in case user happened to change it..
 
-           formFields.fieldsArr = function(val) {
-               if (!arguments.length) return _fieldsArr;
-               _fieldsArr = val || [];
-               return formFields;
-           };
+           context.container().select('.inspector-wrap .panewrap').style('right', '0%'); // disallow scrolling
 
-           formFields.state = function(val) {
-               if (!arguments.length) return _state;
-               _state = val;
-               return formFields;
-           };
+           context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
 
-           formFields.klass = function(val) {
-               if (!arguments.length) return _klass;
-               _klass = val;
-               return formFields;
+           var onClick = function onClick() {
+             continueTo(closeTownHall);
            };
 
+           reveal('.entity-editor-pane .section-preset-fields', helpHtml('intro.navigation.fields_townhall'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: onClick
+           });
+           context.on('exit.intro', function () {
+             continueTo(clickTownHall);
+           });
+           context.history().on('change.intro', function () {
+             if (!context.hasEntity(hallId)) {
+               continueTo(clickTownHall);
+             }
+           });
 
-           return formFields;
-       }
-
-       function uiSectionPresetFields(context) {
-
-           var section = uiSection('preset-fields', context)
-               .title(function() {
-                   return _t('inspector.fields');
-               })
-               .disclosureContent(renderDisclosureContent);
-
-           var dispatch$1 = dispatch('change', 'revert');
-           var formFields = uiFormFields(context);
-           var _state;
-           var _fieldsArr;
-           var _presets = [];
-           var _tags;
-           var _entityIDs;
+           function continueTo(nextStep) {
+             context.on('exit.intro', null);
+             context.history().on('change.intro', null);
+             context.container().select('.inspector-wrap').on('wheel.intro', null);
+             nextStep();
+           }
+         }
 
-           function renderDisclosureContent(selection) {
-               if (!_fieldsArr) {
+         function closeTownHall() {
+           if (!isTownHallSelected()) return clickTownHall();
+           var selector = '.entity-editor-pane button.close svg use';
+           var href = select(selector).attr('href') || '#iD-icon-close';
+           reveal('.entity-editor-pane', helpHtml('intro.navigation.close_townhall', {
+             button: icon(href, 'inline')
+           }));
+           context.on('exit.intro', function () {
+             continueTo(searchStreet);
+           });
+           context.history().on('change.intro', function () {
+             // update the close icon in the tooltip if the user edits something.
+             var selector = '.entity-editor-pane button.close svg use';
+             var href = select(selector).attr('href') || '#iD-icon-close';
+             reveal('.entity-editor-pane', helpHtml('intro.navigation.close_townhall', {
+               button: icon(href, 'inline')
+             }), {
+               duration: 0
+             });
+           });
 
-                   var graph = context.graph();
+           function continueTo(nextStep) {
+             context.on('exit.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
+           }
+         }
 
-                   var geometries = Object.keys(_entityIDs.reduce(function(geoms, entityID) {
-                       return geoms[graph.entity(entityID).geometry(graph)] = true;
-                   }, {}));
+         function searchStreet() {
+           context.enter(modeBrowse(context));
+           context.history().reset('initial'); // ensure spring street exists
 
-                   var presetsManager = _mainPresetIndex;
+           var msec = transitionTime(springStreet, context.map().center());
 
-                   var allFields = [];
-                   var allMoreFields = [];
-                   var sharedTotalFields;
+           if (msec) {
+             reveal(null, null, {
+               duration: 0
+             });
+           }
 
-                   _presets.forEach(function(preset) {
-                       var fields = preset.fields();
-                       var moreFields = preset.moreFields();
+           context.map().centerZoomEase(springStreet, 19, msec); // ..and user can see it
 
-                       allFields = utilArrayUnion(allFields, fields);
-                       allMoreFields = utilArrayUnion(allMoreFields, moreFields);
+           timeout(function () {
+             reveal('.search-header input', helpHtml('intro.navigation.search_street', {
+               name: _t('intro.graph.name.spring-street')
+             }));
+             context.container().select('.search-header input').on('keyup.intro', checkSearchResult);
+           }, msec + 100);
+         }
 
-                       if (!sharedTotalFields) {
-                           sharedTotalFields = utilArrayUnion(fields, moreFields);
-                       } else {
-                           sharedTotalFields = sharedTotalFields.filter(function(field) {
-                               return fields.indexOf(field) !== -1 || moreFields.indexOf(field) !== -1;
-                           });
-                       }
-                   });
+         function checkSearchResult() {
+           var first = context.container().select('.feature-list-item:nth-child(0n+2)'); // skip "No Results" item
 
-                   var sharedFields = allFields.filter(function(field) {
-                       return sharedTotalFields.indexOf(field) !== -1;
-                   });
-                   var sharedMoreFields = allMoreFields.filter(function(field) {
-                       return sharedTotalFields.indexOf(field) !== -1;
-                   });
+           var firstName = first.select('.entity-name');
+           var name = _t('intro.graph.name.spring-street');
 
-                   _fieldsArr = [];
+           if (!firstName.empty() && firstName.html() === name) {
+             reveal(first.node(), helpHtml('intro.navigation.choose_street', {
+               name: name
+             }), {
+               duration: 300
+             });
+             context.on('exit.intro', function () {
+               continueTo(selectedStreet);
+             });
+             context.container().select('.search-header input').on('keydown.intro', eventCancel, true).on('keyup.intro', null);
+           }
 
-                   sharedFields.forEach(function(field) {
-                       if (field.matchAllGeometry(geometries)) {
-                           _fieldsArr.push(
-                               uiField(context, field, _entityIDs)
-                           );
-                       }
-                   });
+           function continueTo(nextStep) {
+             context.on('exit.intro', null);
+             context.container().select('.search-header input').on('keydown.intro', null).on('keyup.intro', null);
+             nextStep();
+           }
+         }
 
-                   var singularEntity = _entityIDs.length === 1 && graph.hasEntity(_entityIDs[0]);
-                   if (singularEntity && singularEntity.isHighwayIntersection(graph) && presetsManager.field('restrictions')) {
-                       _fieldsArr.push(
-                           uiField(context, presetsManager.field('restrictions'), _entityIDs)
-                       );
-                   }
+         function selectedStreet() {
+           if (!context.hasEntity(springStreetEndId) || !context.hasEntity(springStreetId)) {
+             return searchStreet();
+           }
 
-                   var additionalFields = utilArrayUnion(sharedMoreFields, presetsManager.universal());
-                   additionalFields.sort(function(field1, field2) {
-                       return field1.label().localeCompare(field2.label(), _mainLocalizer.localeCode());
-                   });
+           var onClick = function onClick() {
+             continueTo(editorStreet);
+           };
 
-                   additionalFields.forEach(function(field) {
-                       if (sharedFields.indexOf(field) === -1 &&
-                           field.matchAllGeometry(geometries)) {
-                           _fieldsArr.push(
-                               uiField(context, field, _entityIDs, { show: false })
-                           );
-                       }
-                   });
+           var entity = context.entity(springStreetEndId);
+           var box = pointBox(entity.loc, context);
+           box.height = 500;
+           reveal(box, helpHtml('intro.navigation.selected_street', {
+             name: _t('intro.graph.name.spring-street')
+           }), {
+             duration: 600,
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: onClick
+           });
+           timeout(function () {
+             context.map().on('move.intro drawn.intro', function () {
+               var entity = context.hasEntity(springStreetEndId);
+               if (!entity) return;
+               var box = pointBox(entity.loc, context);
+               box.height = 500;
+               reveal(box, helpHtml('intro.navigation.selected_street', {
+                 name: _t('intro.graph.name.spring-street')
+               }), {
+                 duration: 0,
+                 buttonText: _t.html('intro.ok'),
+                 buttonCallback: onClick
+               });
+             });
+           }, 600); // after reveal.
 
-                   _fieldsArr.forEach(function(field) {
-                       field
-                           .on('change', function(t, onInput) {
-                               dispatch$1.call('change', field, _entityIDs, t, onInput);
-                           })
-                           .on('revert', function(keys) {
-                               dispatch$1.call('revert', field, keys);
-                           });
-                   });
-               }
+           context.on('enter.intro', function (mode) {
+             if (!context.hasEntity(springStreetId)) {
+               return continueTo(searchStreet);
+             }
 
-               _fieldsArr.forEach(function(field) {
-                   field
-                       .state(_state)
-                       .tags(_tags);
-               });
+             var ids = context.selectedIDs();
 
+             if (mode.id !== 'select' || !ids.length || ids[0] !== springStreetId) {
+               // keep Spring Street selected..
+               context.enter(modeSelect(context, [springStreetId]));
+             }
+           });
+           context.history().on('change.intro', function () {
+             if (!context.hasEntity(springStreetEndId) || !context.hasEntity(springStreetId)) {
+               timeout(function () {
+                 continueTo(searchStreet);
+               }, 300); // after any transition (e.g. if user deleted intersection)
+             }
+           });
 
-               selection
-                   .call(formFields
-                       .fieldsArr(_fieldsArr)
-                       .state(_state)
-                       .klass('grouped-items-area')
-                   );
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.on('enter.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
+           }
+         }
 
+         function editorStreet() {
+           var selector = '.entity-editor-pane button.close svg use';
+           var href = select(selector).attr('href') || '#iD-icon-close';
+           reveal('.entity-editor-pane', helpHtml('intro.navigation.street_different_fields') + '{br}' + helpHtml('intro.navigation.editor_street', {
+             button: icon(href, 'inline'),
+             field1: onewayField.label(),
+             field2: maxspeedField.label()
+           }));
+           context.on('exit.intro', function () {
+             continueTo(play);
+           });
+           context.history().on('change.intro', function () {
+             // update the close icon in the tooltip if the user edits something.
+             var selector = '.entity-editor-pane button.close svg use';
+             var href = select(selector).attr('href') || '#iD-icon-close';
+             reveal('.entity-editor-pane', helpHtml('intro.navigation.street_different_fields') + '{br}' + helpHtml('intro.navigation.editor_street', {
+               button: icon(href, 'inline'),
+               field1: onewayField.label(),
+               field2: maxspeedField.label()
+             }), {
+               duration: 0
+             });
+           });
 
-               selection.selectAll('.wrap-form-field input')
-                   .on('keydown', function() {
-                       // if user presses enter, and combobox is not active, accept edits..
-                       if (event.keyCode === 13 && context.container().select('.combobox').empty()) {
-                           context.enter(modeBrowse(context));
-                       }
-                   });
+           function continueTo(nextStep) {
+             context.on('exit.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
            }
+         }
 
-           section.presets = function(val) {
-               if (!arguments.length) return _presets;
-               if (!_presets || !val || !utilArrayIdentical(_presets, val)) {
-                   _presets = val;
-                   _fieldsArr = null;
-               }
-               return section;
-           };
+         function play() {
+           dispatch$1.call('done');
+           reveal('.ideditor', helpHtml('intro.navigation.play', {
+             next: _t('intro.points.title')
+           }), {
+             tooltipBox: '.intro-nav-wrap .chapter-point',
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: function buttonCallback() {
+               reveal('.ideditor');
+             }
+           });
+         }
 
-           section.state = function(val) {
-               if (!arguments.length) return _state;
-               _state = val;
-               return section;
-           };
+         chapter.enter = function () {
+           dragMap();
+         };
 
-           section.tags = function(val) {
-               if (!arguments.length) return _tags;
-               _tags = val;
-               // Don't reset _fieldsArr here.
-               return section;
-           };
+         chapter.exit = function () {
+           timeouts.forEach(window.clearTimeout);
+           context.on('enter.intro exit.intro', null);
+           context.map().on('move.intro drawn.intro', null);
+           context.history().on('change.intro', null);
+           context.container().select('.inspector-wrap').on('wheel.intro', null);
+           context.container().select('.search-header input').on('keydown.intro keyup.intro', null);
+         };
 
-           section.entityIDs = function(val) {
-               if (!arguments.length) return _entityIDs;
-               if (!val || !_entityIDs || !utilArrayIdentical(_entityIDs, val)) {
-                   _entityIDs = val;
-                   _fieldsArr = null;
-               }
-               return section;
-           };
+         chapter.restart = function () {
+           chapter.exit();
+           chapter.enter();
+         };
 
-           return utilRebind(section, dispatch$1, 'on');
+         return utilRebind(chapter, dispatch$1, 'on');
        }
 
-       function uiSectionRawMemberEditor(context) {
+       function uiIntroPoint(context, reveal) {
+         var dispatch$1 = dispatch('done');
+         var timeouts = [];
+         var intersection = [-85.63279, 41.94394];
+         var building = [-85.632422, 41.944045];
+         var cafePreset = _mainPresetIndex.item('amenity/cafe');
+         var _pointID = null;
+         var chapter = {
+           title: 'intro.points.title'
+         };
 
-           var section = uiSection('raw-member-editor', context)
-               .shouldDisplay(function() {
-                   if (!_entityIDs || _entityIDs.length !== 1) return false;
+         function timeout(f, t) {
+           timeouts.push(window.setTimeout(f, t));
+         }
 
-                   var entity = context.hasEntity(_entityIDs[0]);
-                   return entity && entity.type === 'relation';
-               })
-               .title(function() {
-                   var entity = context.hasEntity(_entityIDs[0]);
-                   if (!entity) return '';
+         function eventCancel(d3_event) {
+           d3_event.stopPropagation();
+           d3_event.preventDefault();
+         }
 
-                   var gt = entity.members.length > _maxMembers ? '>' : '';
-                   var count = gt + entity.members.slice(0, _maxMembers).length;
-                   return _t('inspector.title_count', { title: _t('inspector.members'), count: count });
-               })
-               .disclosureContent(renderDisclosureContent);
+         function addPoint() {
+           context.enter(modeBrowse(context));
+           context.history().reset('initial');
+           var msec = transitionTime(intersection, context.map().center());
 
-           var taginfo = services.taginfo;
-           var _entityIDs;
-           var _maxMembers = 1000;
+           if (msec) {
+             reveal(null, null, {
+               duration: 0
+             });
+           }
 
-           function downloadMember(d) {
-               event.preventDefault();
+           context.map().centerZoomEase(intersection, 19, msec);
+           timeout(function () {
+             var tooltip = reveal('button.add-point', helpHtml('intro.points.points_info') + '{br}' + helpHtml('intro.points.add_point'));
+             _pointID = null;
+             tooltip.selectAll('.popover-inner').insert('svg', 'span').attr('class', 'tooltip-illustration').append('use').attr('xlink:href', '#iD-graphic-points');
+             context.on('enter.intro', function (mode) {
+               if (mode.id !== 'add-point') return;
+               continueTo(placePoint);
+             });
+           }, msec + 100);
 
-               // display the loading indicator
-               select(this.parentNode).classed('tag-reference-loading', true);
-               context.loadEntity(d.id, function() {
-                   section.reRender();
-               });
+           function continueTo(nextStep) {
+             context.on('enter.intro', null);
+             nextStep();
            }
+         }
 
-           function zoomToMember(d) {
-               event.preventDefault();
+         function placePoint() {
+           if (context.mode().id !== 'add-point') {
+             return chapter.restart();
+           }
 
-               var entity = context.entity(d.id);
-               context.map().zoomToEase(entity);
+           var pointBox = pad(building, 150, context);
+           var textId = context.lastPointerType() === 'mouse' ? 'place_point' : 'place_point_touch';
+           reveal(pointBox, helpHtml('intro.points.' + textId));
+           context.map().on('move.intro drawn.intro', function () {
+             pointBox = pad(building, 150, context);
+             reveal(pointBox, helpHtml('intro.points.' + textId), {
+               duration: 0
+             });
+           });
+           context.on('enter.intro', function (mode) {
+             if (mode.id !== 'select') return chapter.restart();
+             _pointID = context.mode().selectedIDs()[0];
+             continueTo(searchPreset);
+           });
 
-               // highlight the feature in case it wasn't previously on-screen
-               utilHighlightEntities([d.id], true, context);
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.on('enter.intro', null);
+             nextStep();
            }
+         }
 
+         function searchPreset() {
+           if (context.mode().id !== 'select' || !_pointID || !context.hasEntity(_pointID)) {
+             return addPoint();
+           } // disallow scrolling
 
-           function selectMember(d) {
-               event.preventDefault();
 
-               // remove the hover-highlight styling
-               utilHighlightEntities([d.id], false, context);
+           context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+           context.container().select('.preset-search-input').on('keydown.intro', null).on('keyup.intro', checkPresetSearch);
+           reveal('.preset-search-input', helpHtml('intro.points.search_cafe', {
+             preset: cafePreset.name()
+           }));
+           context.on('enter.intro', function (mode) {
+             if (!_pointID || !context.hasEntity(_pointID)) {
+               return continueTo(addPoint);
+             }
 
-               var entity = context.entity(d.id);
-               var mapExtent = context.map().extent();
-               if (!entity.intersects(mapExtent, context.graph())) {
-                   // zoom to the entity if its extent is not visible now
-                   context.map().zoomToEase(entity);
-               }
+             var ids = context.selectedIDs();
+
+             if (mode.id !== 'select' || !ids.length || ids[0] !== _pointID) {
+               // keep the user's point selected..
+               context.enter(modeSelect(context, [_pointID])); // disallow scrolling
+
+               context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+               context.container().select('.preset-search-input').on('keydown.intro', null).on('keyup.intro', checkPresetSearch);
+               reveal('.preset-search-input', helpHtml('intro.points.search_cafe', {
+                 preset: cafePreset.name()
+               }));
+               context.history().on('change.intro', null);
+             }
+           });
 
-               context.enter(modeSelect(context, [d.id]));
+           function checkPresetSearch() {
+             var first = context.container().select('.preset-list-item:first-child');
+
+             if (first.classed('preset-amenity-cafe')) {
+               context.container().select('.preset-search-input').on('keydown.intro', eventCancel, true).on('keyup.intro', null);
+               reveal(first.select('.preset-list-button').node(), helpHtml('intro.points.choose_cafe', {
+                 preset: cafePreset.name()
+               }), {
+                 duration: 300
+               });
+               context.history().on('change.intro', function () {
+                 continueTo(aboutFeatureEditor);
+               });
+             }
            }
 
+           function continueTo(nextStep) {
+             context.on('enter.intro', null);
+             context.history().on('change.intro', null);
+             context.container().select('.inspector-wrap').on('wheel.intro', null);
+             context.container().select('.preset-search-input').on('keydown.intro keyup.intro', null);
+             nextStep();
+           }
+         }
 
-           function changeRole(d) {
-               var oldRole = d.role;
-               var newRole = context.cleanRelationRole(select(this).property('value'));
+         function aboutFeatureEditor() {
+           if (context.mode().id !== 'select' || !_pointID || !context.hasEntity(_pointID)) {
+             return addPoint();
+           }
 
-               if (oldRole !== newRole) {
-                   var member = { id: d.id, type: d.type, role: newRole };
-                   context.perform(
-                       actionChangeMember(d.relation.id, member, d.index),
-                       _t('operations.change_role.annotation')
-                   );
+           timeout(function () {
+             reveal('.entity-editor-pane', helpHtml('intro.points.feature_editor'), {
+               tooltipClass: 'intro-points-describe',
+               buttonText: _t.html('intro.ok'),
+               buttonCallback: function buttonCallback() {
+                 continueTo(addName);
                }
+             });
+           }, 400);
+           context.on('exit.intro', function () {
+             // if user leaves select mode here, just continue with the tutorial.
+             continueTo(reselectPoint);
+           });
+
+           function continueTo(nextStep) {
+             context.on('exit.intro', null);
+             nextStep();
            }
+         }
 
+         function addName() {
+           if (context.mode().id !== 'select' || !_pointID || !context.hasEntity(_pointID)) {
+             return addPoint();
+           } // reset pane, in case user happened to change it..
 
-           function deleteMember(d) {
 
-               // remove the hover-highlight styling
-               utilHighlightEntities([d.id], false, context);
+           context.container().select('.inspector-wrap .panewrap').style('right', '0%');
+           var addNameString = helpHtml('intro.points.fields_info') + '{br}' + helpHtml('intro.points.add_name');
+           timeout(function () {
+             // It's possible for the user to add a name in a previous step..
+             // If so, don't tell them to add the name in this step.
+             // Give them an OK button instead.
+             var entity = context.entity(_pointID);
 
-               context.perform(
-                   actionDeleteMember(d.relation.id, d.index),
-                   _t('operations.delete_member.annotation')
-               );
+             if (entity.tags.name) {
+               var tooltip = reveal('.entity-editor-pane', addNameString, {
+                 tooltipClass: 'intro-points-describe',
+                 buttonText: _t.html('intro.ok'),
+                 buttonCallback: function buttonCallback() {
+                   continueTo(addCloseEditor);
+                 }
+               });
+               tooltip.select('.instruction').style('display', 'none');
+             } else {
+               reveal('.entity-editor-pane', addNameString, {
+                 tooltipClass: 'intro-points-describe'
+               });
+             }
+           }, 400);
+           context.history().on('change.intro', function () {
+             continueTo(addCloseEditor);
+           });
+           context.on('exit.intro', function () {
+             // if user leaves select mode here, just continue with the tutorial.
+             continueTo(reselectPoint);
+           });
 
-               if (!context.hasEntity(d.relation.id)) {
-                   context.enter(modeBrowse(context));
-               }
+           function continueTo(nextStep) {
+             context.on('exit.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
            }
+         }
+
+         function addCloseEditor() {
+           // reset pane, in case user happened to change it..
+           context.container().select('.inspector-wrap .panewrap').style('right', '0%');
+           var selector = '.entity-editor-pane button.close svg use';
+           var href = select(selector).attr('href') || '#iD-icon-close';
+           context.on('exit.intro', function () {
+             continueTo(reselectPoint);
+           });
+           reveal('.entity-editor-pane', helpHtml('intro.points.add_close', {
+             button: icon(href, 'inline')
+           }));
+
+           function continueTo(nextStep) {
+             context.on('exit.intro', null);
+             nextStep();
+           }
+         }
 
-           function renderDisclosureContent(selection) {
+         function reselectPoint() {
+           if (!_pointID) return chapter.restart();
+           var entity = context.hasEntity(_pointID);
+           if (!entity) return chapter.restart(); // make sure it's still a cafe, in case user somehow changed it..
 
-               var entityID = _entityIDs[0];
+           var oldPreset = _mainPresetIndex.match(entity, context.graph());
+           context.replace(actionChangePreset(_pointID, oldPreset, cafePreset));
+           context.enter(modeBrowse(context));
+           var msec = transitionTime(entity.loc, context.map().center());
 
-               var memberships = [];
-               var entity = context.entity(entityID);
-               entity.members.slice(0, _maxMembers).forEach(function(member, index) {
-                   memberships.push({
-                       index: index,
-                       id: member.id,
-                       type: member.type,
-                       role: member.role,
-                       relation: entity,
-                       member: context.hasEntity(member.id),
-                       domId: utilUniqueDomId(entityID + '-member-' + index)
-                   });
+           if (msec) {
+             reveal(null, null, {
+               duration: 0
+             });
+           }
+
+           context.map().centerEase(entity.loc, msec);
+           timeout(function () {
+             var box = pointBox(entity.loc, context);
+             reveal(box, helpHtml('intro.points.reselect'), {
+               duration: 600
+             });
+             timeout(function () {
+               context.map().on('move.intro drawn.intro', function () {
+                 var entity = context.hasEntity(_pointID);
+                 if (!entity) return chapter.restart();
+                 var box = pointBox(entity.loc, context);
+                 reveal(box, helpHtml('intro.points.reselect'), {
+                   duration: 0
+                 });
                });
+             }, 600); // after reveal..
+
+             context.on('enter.intro', function (mode) {
+               if (mode.id !== 'select') return;
+               continueTo(updatePoint);
+             });
+           }, msec + 100);
 
-               var list = selection.selectAll('.member-list')
-                   .data([0]);
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.on('enter.intro', null);
+             nextStep();
+           }
+         }
 
-               list = list.enter()
-                   .append('ul')
-                   .attr('class', 'member-list')
-                   .merge(list);
+         function updatePoint() {
+           if (context.mode().id !== 'select' || !_pointID || !context.hasEntity(_pointID)) {
+             return continueTo(reselectPoint);
+           } // reset pane, in case user happened to untag the point..
 
 
-               var items = list.selectAll('li')
-                   .data(memberships, function(d) {
-                       return osmEntity.key(d.relation) + ',' + d.index + ',' +
-                           (d.member ? osmEntity.key(d.member) : 'incomplete');
-                   });
+           context.container().select('.inspector-wrap .panewrap').style('right', '0%');
+           context.on('exit.intro', function () {
+             continueTo(reselectPoint);
+           });
+           context.history().on('change.intro', function () {
+             continueTo(updateCloseEditor);
+           });
+           timeout(function () {
+             reveal('.entity-editor-pane', helpHtml('intro.points.update'), {
+               tooltipClass: 'intro-points-describe'
+             });
+           }, 400);
 
-               items.exit()
-                   .each(unbind)
-                   .remove();
-
-               var itemsEnter = items.enter()
-                   .append('li')
-                   .attr('class', 'member-row form-field')
-                   .classed('member-incomplete', function(d) { return !d.member; });
-
-               itemsEnter
-                   .each(function(d) {
-                       var item = select(this);
-
-                       var label = item
-                           .append('label')
-                           .attr('class', 'field-label')
-                           .attr('for', d.domId);
-
-                       if (d.member) {
-                           // highlight the member feature in the map while hovering on the list item
-                           item
-                               .on('mouseover', function() {
-                                   utilHighlightEntities([d.id], true, context);
-                               })
-                               .on('mouseout', function() {
-                                   utilHighlightEntities([d.id], false, context);
-                               });
-
-                           var labelLink = label
-                               .append('span')
-                               .attr('class', 'label-text')
-                               .append('a')
-                               .attr('href', '#')
-                               .on('click', selectMember);
-
-                           labelLink
-                               .append('span')
-                               .attr('class', 'member-entity-type')
-                               .text(function(d) {
-                                   var matched = _mainPresetIndex.match(d.member, context.graph());
-                                   return (matched && matched.name()) || utilDisplayType(d.member.id);
-                               });
-
-                           labelLink
-                               .append('span')
-                               .attr('class', 'member-entity-name')
-                               .text(function(d) { return utilDisplayName(d.member); });
-
-                           label
-                               .append('button')
-                               .attr('tabindex', -1)
-                               .attr('title', _t('icons.remove'))
-                               .attr('class', 'remove member-delete')
-                               .call(svgIcon('#iD-operation-delete'));
-
-                           label
-                               .append('button')
-                               .attr('class', 'member-zoom')
-                               .attr('title', _t('icons.zoom_to'))
-                               .call(svgIcon('#iD-icon-framed-dot', 'monochrome'))
-                               .on('click', zoomToMember);
-
-                       } else {
-                           var labelText = label
-                               .append('span')
-                               .attr('class', 'label-text');
-
-                           labelText
-                               .append('span')
-                               .attr('class', 'member-entity-type')
-                               .text(_t('inspector.' + d.type, { id: d.id }));
-
-                           labelText
-                               .append('span')
-                               .attr('class', 'member-entity-name')
-                               .text(_t('inspector.incomplete', { id: d.id }));
-
-                           label
-                               .append('button')
-                               .attr('class', 'member-download')
-                               .attr('title', _t('icons.download'))
-                               .attr('tabindex', -1)
-                               .call(svgIcon('#iD-icon-load'))
-                               .on('click', downloadMember);
-                       }
-                   });
+           function continueTo(nextStep) {
+             context.on('exit.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
+           }
+         }
 
-               var wrapEnter = itemsEnter
-                   .append('div')
-                   .attr('class', 'form-field-input-wrap form-field-input-member');
-
-               wrapEnter
-                   .append('input')
-                   .attr('class', 'member-role')
-                   .attr('id', function(d) {
-                       return d.domId;
-                   })
-                   .property('type', 'text')
-                   .attr('placeholder', _t('inspector.role'))
-                   .call(utilNoAuto);
-
-               if (taginfo) {
-                   wrapEnter.each(bindTypeahead);
-               }
-
-               // update
-               items = items
-                   .merge(itemsEnter)
-                   .order();
-
-               items.select('input.member-role')
-                   .property('value', function(d) { return d.role; })
-                   .on('blur', changeRole)
-                   .on('change', changeRole);
-
-               items.select('button.member-delete')
-                   .on('click', deleteMember);
-
-               var dragOrigin, targetIndex;
-
-               items.call(d3_drag()
-                   .on('start', function() {
-                       dragOrigin = {
-                           x: event.x,
-                           y: event.y
-                       };
-                       targetIndex = null;
-                   })
-                   .on('drag', function(d, index) {
-                       var x = event.x - dragOrigin.x,
-                           y = event.y - dragOrigin.y;
-
-                       if (!select(this).classed('dragging') &&
-                           // don't display drag until dragging beyond a distance threshold
-                           Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2)) <= 5) return;
-
-                       select(this)
-                           .classed('dragging', true);
-
-                       targetIndex = null;
-
-                       selection.selectAll('li.member-row')
-                           .style('transform', function(d2, index2) {
-                               var node = select(this).node();
-                               if (index === index2) {
-                                   return 'translate(' + x + 'px, ' + y + 'px)';
-                               } else if (index2 > index && event.y > node.offsetTop) {
-                                   if (targetIndex === null || index2 > targetIndex) {
-                                       targetIndex = index2;
-                                   }
-                                   return 'translateY(-100%)';
-                               } else if (index2 < index && event.y < node.offsetTop + node.offsetHeight) {
-                                   if (targetIndex === null || index2 < targetIndex) {
-                                       targetIndex = index2;
-                                   }
-                                   return 'translateY(100%)';
-                               }
-                               return null;
-                           });
-                   })
-                   .on('end', function(d, index) {
+         function updateCloseEditor() {
+           if (context.mode().id !== 'select' || !_pointID || !context.hasEntity(_pointID)) {
+             return continueTo(reselectPoint);
+           } // reset pane, in case user happened to change it..
 
-                       if (!select(this).classed('dragging')) {
-                           return;
-                       }
 
-                       select(this)
-                           .classed('dragging', false);
+           context.container().select('.inspector-wrap .panewrap').style('right', '0%');
+           context.on('exit.intro', function () {
+             continueTo(rightClickPoint);
+           });
+           timeout(function () {
+             reveal('.entity-editor-pane', helpHtml('intro.points.update_close', {
+               button: icon('#iD-icon-close', 'inline')
+             }));
+           }, 500);
 
-                       selection.selectAll('li.member-row')
-                           .style('transform', null);
+           function continueTo(nextStep) {
+             context.on('exit.intro', null);
+             nextStep();
+           }
+         }
 
-                       if (targetIndex !== null) {
-                           // dragged to a new position, reorder
-                           context.perform(
-                               actionMoveMember(d.relation.id, index, targetIndex),
-                               _t('operations.reorder_members.annotation')
-                           );
-                       }
-                   })
-               );
+         function rightClickPoint() {
+           if (!_pointID) return chapter.restart();
+           var entity = context.hasEntity(_pointID);
+           if (!entity) return chapter.restart();
+           context.enter(modeBrowse(context));
+           var box = pointBox(entity.loc, context);
+           var textId = context.lastPointerType() === 'mouse' ? 'rightclick' : 'edit_menu_touch';
+           reveal(box, helpHtml('intro.points.' + textId), {
+             duration: 600
+           });
+           timeout(function () {
+             context.map().on('move.intro', function () {
+               var entity = context.hasEntity(_pointID);
+               if (!entity) return chapter.restart();
+               var box = pointBox(entity.loc, context);
+               reveal(box, helpHtml('intro.points.' + textId), {
+                 duration: 0
+               });
+             });
+           }, 600); // after reveal
 
+           context.on('enter.intro', function (mode) {
+             if (mode.id !== 'select') return;
+             var ids = context.selectedIDs();
+             if (ids.length !== 1 || ids[0] !== _pointID) return;
+             timeout(function () {
+               var node = selectMenuItem(context, 'delete').node();
+               if (!node) return;
+               continueTo(enterDelete);
+             }, 50); // after menu visible
+           });
 
+           function continueTo(nextStep) {
+             context.on('enter.intro', null);
+             context.map().on('move.intro', null);
+             nextStep();
+           }
+         }
 
-               function bindTypeahead(d) {
-                   var row = select(this);
-                   var role = row.selectAll('input.member-role');
-                   var origValue = role.property('value');
+         function enterDelete() {
+           if (!_pointID) return chapter.restart();
+           var entity = context.hasEntity(_pointID);
+           if (!entity) return chapter.restart();
+           var node = selectMenuItem(context, 'delete').node();
 
-                   function sort(value, data) {
-                       var sameletter = [];
-                       var other = [];
-                       for (var i = 0; i < data.length; i++) {
-                           if (data[i].value.substring(0, value.length) === value) {
-                               sameletter.push(data[i]);
-                           } else {
-                               other.push(data[i]);
-                           }
-                       }
-                       return sameletter.concat(other);
-                   }
+           if (!node) {
+             return continueTo(rightClickPoint);
+           }
 
-                   role.call(uiCombobox(context, 'member-role')
-                       .fetcher(function(role, callback) {
-                           // The `geometry` param is used in the `taginfo.js` interface for
-                           // filtering results, as a key into the `tag_members_fractions`
-                           // object.  If we don't know the geometry because the member is
-                           // not yet downloaded, it's ok to guess based on type.
-                           var geometry;
-                           if (d.member) {
-                               geometry = context.graph().geometry(d.member.id);
-                           } else if (d.type === 'relation') {
-                               geometry = 'relation';
-                           } else if (d.type === 'way') {
-                               geometry = 'line';
-                           } else {
-                               geometry = 'point';
-                           }
+           reveal('.edit-menu', helpHtml('intro.points.delete'), {
+             padding: 50
+           });
+           timeout(function () {
+             context.map().on('move.intro', function () {
+               reveal('.edit-menu', helpHtml('intro.points.delete'), {
+                 duration: 0,
+                 padding: 50
+               });
+             });
+           }, 300); // after menu visible
 
-                           var rtype = entity.tags.type;
-                           taginfo.roles({
-                               debounce: true,
-                               rtype: rtype || '',
-                               geometry: geometry,
-                               query: role
-                           }, function(err, data) {
-                               if (!err) callback(sort(role, data));
-                           });
-                       })
-                       .on('cancel', function() {
-                           role.property('value', origValue);
-                       })
-                   );
-               }
+           context.on('exit.intro', function () {
+             if (!_pointID) return chapter.restart();
+             var entity = context.hasEntity(_pointID);
+             if (entity) return continueTo(rightClickPoint); // point still exists
+           });
+           context.history().on('change.intro', function (changed) {
+             if (changed.deleted().length) {
+               continueTo(undo);
+             }
+           });
 
+           function continueTo(nextStep) {
+             context.map().on('move.intro', null);
+             context.history().on('change.intro', null);
+             context.on('exit.intro', null);
+             nextStep();
+           }
+         }
 
-               function unbind() {
-                   var row = select(this);
+         function undo() {
+           context.history().on('change.intro', function () {
+             continueTo(play);
+           });
+           reveal('.top-toolbar button.undo-button', helpHtml('intro.points.undo'));
 
-                   row.selectAll('input.member-role')
-                       .call(uiCombobox.off, context);
-               }
+           function continueTo(nextStep) {
+             context.history().on('change.intro', null);
+             nextStep();
            }
+         }
 
-           section.entityIDs = function(val) {
-               if (!arguments.length) return _entityIDs;
-               _entityIDs = val;
-               return section;
-           };
+         function play() {
+           dispatch$1.call('done');
+           reveal('.ideditor', helpHtml('intro.points.play', {
+             next: _t('intro.areas.title')
+           }), {
+             tooltipBox: '.intro-nav-wrap .chapter-area',
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: function buttonCallback() {
+               reveal('.ideditor');
+             }
+           });
+         }
 
+         chapter.enter = function () {
+           addPoint();
+         };
 
-           return section;
+         chapter.exit = function () {
+           timeouts.forEach(window.clearTimeout);
+           context.on('enter.intro exit.intro', null);
+           context.map().on('move.intro drawn.intro', null);
+           context.history().on('change.intro', null);
+           context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+           context.container().select('.preset-search-input').on('keydown.intro keyup.intro', null);
+         };
+
+         chapter.restart = function () {
+           chapter.exit();
+           chapter.enter();
+         };
+
+         return utilRebind(chapter, dispatch$1, 'on');
        }
 
-       function uiSectionRawMembershipEditor(context) {
+       function uiIntroArea(context, reveal) {
+         var dispatch$1 = dispatch('done');
+         var playground = [-85.63552, 41.94159];
+         var playgroundPreset = _mainPresetIndex.item('leisure/playground');
+         var nameField = _mainPresetIndex.field('name');
+         var descriptionField = _mainPresetIndex.field('description');
+         var timeouts = [];
 
-           var section = uiSection('raw-membership-editor', context)
-               .shouldDisplay(function() {
-                   return _entityIDs && _entityIDs.length === 1;
-               })
-               .title(function() {
-                   var entity = context.hasEntity(_entityIDs[0]);
-                   if (!entity) return '';
-
-                   var parents = context.graph().parentRelations(entity);
-                   var gt = parents.length > _maxMemberships ? '>' : '';
-                   var count = gt + parents.slice(0, _maxMemberships).length;
-                   return _t('inspector.title_count', { title: _t('inspector.relations'), count: count });
-               })
-               .disclosureContent(renderDisclosureContent);
-
-           var taginfo = services.taginfo;
-           var nearbyCombo = uiCombobox(context, 'parent-relation')
-               .minItems(1)
-               .fetcher(fetchNearbyRelations)
-               .itemsMouseEnter(function(d) {
-                   if (d.relation) utilHighlightEntities([d.relation.id], true, context);
-               })
-               .itemsMouseLeave(function(d) {
-                   if (d.relation) utilHighlightEntities([d.relation.id], false, context);
-               });
-           var _inChange = false;
-           var _entityIDs = [];
-           var _showBlank;
-           var _maxMemberships = 1000;
+         var _areaID;
 
-           function selectRelation(d) {
-               event.preventDefault();
+         var chapter = {
+           title: 'intro.areas.title'
+         };
 
-               // remove the hover-highlight styling
-               utilHighlightEntities([d.relation.id], false, context);
+         function timeout(f, t) {
+           timeouts.push(window.setTimeout(f, t));
+         }
 
-               context.enter(modeSelect(context, [d.relation.id]));
-           }
+         function eventCancel(d3_event) {
+           d3_event.stopPropagation();
+           d3_event.preventDefault();
+         }
 
-           function zoomToRelation(d) {
-               event.preventDefault();
+         function revealPlayground(center, text, options) {
+           var padding = 180 * Math.pow(2, context.map().zoom() - 19.5);
+           var box = pad(center, padding, context);
+           reveal(box, text, options);
+         }
 
-               var entity = context.entity(d.relation.id);
-               context.map().zoomToEase(entity);
+         function addArea() {
+           context.enter(modeBrowse(context));
+           context.history().reset('initial');
+           _areaID = null;
+           var msec = transitionTime(playground, context.map().center());
 
-               // highlight the relation in case it wasn't previously on-screen
-               utilHighlightEntities([d.relation.id], true, context);
+           if (msec) {
+             reveal(null, null, {
+               duration: 0
+             });
            }
 
+           context.map().centerZoomEase(playground, 19, msec);
+           timeout(function () {
+             var tooltip = reveal('button.add-area', helpHtml('intro.areas.add_playground'));
+             tooltip.selectAll('.popover-inner').insert('svg', 'span').attr('class', 'tooltip-illustration').append('use').attr('xlink:href', '#iD-graphic-areas');
+             context.on('enter.intro', function (mode) {
+               if (mode.id !== 'add-area') return;
+               continueTo(startPlayground);
+             });
+           }, msec + 100);
 
-           function changeRole(d) {
-               if (d === 0) return;    // called on newrow (shoudn't happen)
-               if (_inChange) return;  // avoid accidental recursive call #5731
-
-               var oldRole = d.member.role;
-               var newRole = context.cleanRelationRole(select(this).property('value'));
+           function continueTo(nextStep) {
+             context.on('enter.intro', null);
+             nextStep();
+           }
+         }
 
-               if (oldRole !== newRole) {
-                   _inChange = true;
-                   context.perform(
-                       actionChangeMember(d.relation.id, Object.assign({}, d.member, { role: newRole }), d.index),
-                       _t('operations.change_role.annotation')
-                   );
-               }
-               _inChange = false;
+         function startPlayground() {
+           if (context.mode().id !== 'add-area') {
+             return chapter.restart();
            }
 
+           _areaID = null;
+           context.map().zoomEase(19.5, 500);
+           timeout(function () {
+             var textId = context.lastPointerType() === 'mouse' ? 'starting_node_click' : 'starting_node_tap';
+             var startDrawString = helpHtml('intro.areas.start_playground') + helpHtml('intro.areas.' + textId);
+             revealPlayground(playground, startDrawString, {
+               duration: 250
+             });
+             timeout(function () {
+               context.map().on('move.intro drawn.intro', function () {
+                 revealPlayground(playground, startDrawString, {
+                   duration: 0
+                 });
+               });
+               context.on('enter.intro', function (mode) {
+                 if (mode.id !== 'draw-area') return chapter.restart();
+                 continueTo(continuePlayground);
+               });
+             }, 250); // after reveal
+           }, 550); // after easing
+
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.on('enter.intro', null);
+             nextStep();
+           }
+         }
 
-           function addMembership(d, role) {
-               this.blur();           // avoid keeping focus on the button
-               _showBlank = false;
+         function continuePlayground() {
+           if (context.mode().id !== 'draw-area') {
+             return chapter.restart();
+           }
 
-               var member = { id: _entityIDs[0], type: context.entity(_entityIDs[0]).type, role: role };
+           _areaID = null;
+           revealPlayground(playground, helpHtml('intro.areas.continue_playground'), {
+             duration: 250
+           });
+           timeout(function () {
+             context.map().on('move.intro drawn.intro', function () {
+               revealPlayground(playground, helpHtml('intro.areas.continue_playground'), {
+                 duration: 0
+               });
+             });
+           }, 250); // after reveal
 
-               if (d.relation) {
-                   context.perform(
-                       actionAddMember(d.relation.id, member),
-                       _t('operations.add_member.annotation')
-                   );
+           context.on('enter.intro', function (mode) {
+             if (mode.id === 'draw-area') {
+               var entity = context.hasEntity(context.selectedIDs()[0]);
 
+               if (entity && entity.nodes.length >= 6) {
+                 return continueTo(finishPlayground);
                } else {
-                   var relation = osmRelation();
-                   context.perform(
-                       actionAddEntity(relation),
-                       actionAddMember(relation.id, member),
-                       _t('operations.add.annotation.relation')
-                   );
-
-                   context.enter(modeSelect(context, [relation.id]).newFeature(true));
+                 return;
                }
+             } else if (mode.id === 'select') {
+               _areaID = context.selectedIDs()[0];
+               return continueTo(searchPresets);
+             } else {
+               return chapter.restart();
+             }
+           });
+
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.on('enter.intro', null);
+             nextStep();
            }
+         }
 
+         function finishPlayground() {
+           if (context.mode().id !== 'draw-area') {
+             return chapter.restart();
+           }
 
-           function deleteMembership(d) {
-               this.blur();           // avoid keeping focus on the button
-               if (d === 0) return;   // called on newrow (shoudn't happen)
+           _areaID = null;
+           var finishString = helpHtml('intro.areas.finish_area_' + (context.lastPointerType() === 'mouse' ? 'click' : 'tap')) + helpHtml('intro.areas.finish_playground');
+           revealPlayground(playground, finishString, {
+             duration: 250
+           });
+           timeout(function () {
+             context.map().on('move.intro drawn.intro', function () {
+               revealPlayground(playground, finishString, {
+                 duration: 0
+               });
+             });
+           }, 250); // after reveal
 
-               // remove the hover-highlight styling
-               utilHighlightEntities([d.relation.id], false, context);
+           context.on('enter.intro', function (mode) {
+             if (mode.id === 'draw-area') {
+               return;
+             } else if (mode.id === 'select') {
+               _areaID = context.selectedIDs()[0];
+               return continueTo(searchPresets);
+             } else {
+               return chapter.restart();
+             }
+           });
 
-               context.perform(
-                   actionDeleteMember(d.relation.id, d.index),
-                   _t('operations.delete_member.annotation')
-               );
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.on('enter.intro', null);
+             nextStep();
            }
+         }
 
+         function searchPresets() {
+           if (!_areaID || !context.hasEntity(_areaID)) {
+             return addArea();
+           }
 
-           function fetchNearbyRelations(q, callback) {
-               var newRelation = { relation: null, value: _t('inspector.new_relation') };
-
-               var entityID = _entityIDs[0];
+           var ids = context.selectedIDs();
 
-               var result = [];
+           if (context.mode().id !== 'select' || !ids.length || ids[0] !== _areaID) {
+             context.enter(modeSelect(context, [_areaID]));
+           } // disallow scrolling
 
-               var graph = context.graph();
 
-               function baseDisplayLabel(entity) {
-                   var matched = _mainPresetIndex.match(entity, graph);
-                   var presetName = (matched && matched.name()) || _t('inspector.relation');
-                   var entityName = utilDisplayName(entity) || '';
+           context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+           timeout(function () {
+             // reset pane, in case user somehow happened to change it..
+             context.container().select('.inspector-wrap .panewrap').style('right', '-100%');
+             context.container().select('.preset-search-input').on('keydown.intro', null).on('keyup.intro', checkPresetSearch);
+             reveal('.preset-search-input', helpHtml('intro.areas.search_playground', {
+               preset: playgroundPreset.name()
+             }));
+           }, 400); // after preset list pane visible..
 
-                   return presetName + ' ' + entityName;
-               }
+           context.on('enter.intro', function (mode) {
+             if (!_areaID || !context.hasEntity(_areaID)) {
+               return continueTo(addArea);
+             }
 
-               var explicitRelation = q && context.hasEntity(q.toLowerCase());
-               if (explicitRelation && explicitRelation.type === 'relation' && explicitRelation.id !== entityID) {
-                   // loaded relation is specified explicitly, only show that
+             var ids = context.selectedIDs();
 
-                   result.push({
-                       relation: explicitRelation,
-                       value: baseDisplayLabel(explicitRelation) + ' ' + explicitRelation.id
-                   });
-               } else {
+             if (mode.id !== 'select' || !ids.length || ids[0] !== _areaID) {
+               // keep the user's area selected..
+               context.enter(modeSelect(context, [_areaID])); // reset pane, in case user somehow happened to change it..
 
-                   context.history().intersects(context.map().extent()).forEach(function(entity) {
-                       if (entity.type !== 'relation' || entity.id === entityID) return;
+               context.container().select('.inspector-wrap .panewrap').style('right', '-100%'); // disallow scrolling
 
-                       var value = baseDisplayLabel(entity);
-                       if (q && (value + ' ' + entity.id).toLowerCase().indexOf(q.toLowerCase()) === -1) return;
+               context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+               context.container().select('.preset-search-input').on('keydown.intro', null).on('keyup.intro', checkPresetSearch);
+               reveal('.preset-search-input', helpHtml('intro.areas.search_playground', {
+                 preset: playgroundPreset.name()
+               }));
+               context.history().on('change.intro', null);
+             }
+           });
 
-                       result.push({ relation: entity, value: value });
-                   });
+           function checkPresetSearch() {
+             var first = context.container().select('.preset-list-item:first-child');
 
-                   result.sort(function(a, b) {
-                       return osmRelation.creationOrder(a.relation, b.relation);
-                   });
+             if (first.classed('preset-leisure-playground')) {
+               reveal(first.select('.preset-list-button').node(), helpHtml('intro.areas.choose_playground', {
+                 preset: playgroundPreset.name()
+               }), {
+                 duration: 300
+               });
+               context.container().select('.preset-search-input').on('keydown.intro', eventCancel, true).on('keyup.intro', null);
+               context.history().on('change.intro', function () {
+                 continueTo(clickAddField);
+               });
+             }
+           }
 
-                   // Dedupe identical names by appending relation id - see #2891
-                   var dupeGroups = Object.values(utilArrayGroupBy(result, 'value'))
-                       .filter(function(v) { return v.length > 1; });
+           function continueTo(nextStep) {
+             context.container().select('.inspector-wrap').on('wheel.intro', null);
+             context.on('enter.intro', null);
+             context.history().on('change.intro', null);
+             context.container().select('.preset-search-input').on('keydown.intro keyup.intro', null);
+             nextStep();
+           }
+         }
 
-                   dupeGroups.forEach(function(group) {
-                       group.forEach(function(obj) {
-                           obj.value += ' ' + obj.relation.id;
-                       });
-                   });
-               }
+         function clickAddField() {
+           if (!_areaID || !context.hasEntity(_areaID)) {
+             return addArea();
+           }
 
-               result.forEach(function(obj) {
-                   obj.title = obj.value;
-               });
+           var ids = context.selectedIDs();
 
-               result.unshift(newRelation);
-               callback(result);
+           if (context.mode().id !== 'select' || !ids.length || ids[0] !== _areaID) {
+             return searchPresets();
            }
 
-           function renderDisclosureContent(selection) {
+           if (!context.container().select('.form-field-description').empty()) {
+             return continueTo(describePlayground);
+           } // disallow scrolling
 
-               var entityID = _entityIDs[0];
 
-               var entity = context.entity(entityID);
-               var parents = context.graph().parentRelations(entity);
+           context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+           timeout(function () {
+             // reset pane, in case user somehow happened to change it..
+             context.container().select('.inspector-wrap .panewrap').style('right', '0%'); // It's possible for the user to add a description in a previous step..
+             // If they did this already, just continue to next step.
 
-               var memberships = [];
+             var entity = context.entity(_areaID);
 
-               parents.slice(0, _maxMemberships).forEach(function(relation) {
-                   relation.members.forEach(function(member, index) {
-                       if (member.id === entity.id) {
-                           memberships.push({
-                               relation: relation,
-                               member: member,
-                               index: index,
-                               domId: utilUniqueDomId(entityID + '-membership-' + relation.id + '-' + index)
-                           });
-                       }
-                   });
+             if (entity.tags.description) {
+               return continueTo(play);
+             } // scroll "Add field" into view
+
+
+             var box = context.container().select('.more-fields').node().getBoundingClientRect();
+
+             if (box.top > 300) {
+               var pane = context.container().select('.entity-editor-pane .inspector-body');
+               var start = pane.node().scrollTop;
+               var end = start + (box.top - 300);
+               pane.transition().duration(250).tween('scroll.inspector', function () {
+                 var node = this;
+                 var i = d3_interpolateNumber(start, end);
+                 return function (t) {
+                   node.scrollTop = i(t);
+                 };
                });
+             }
 
-               var list = selection.selectAll('.member-list')
-                   .data([0]);
+             timeout(function () {
+               reveal('.more-fields .combobox-input', helpHtml('intro.areas.add_field', {
+                 name: nameField.label(),
+                 description: descriptionField.label()
+               }), {
+                 duration: 300
+               });
+               context.container().select('.more-fields .combobox-input').on('click.intro', function () {
+                 // Watch for the combobox to appear...
+                 var watcher;
+                 watcher = window.setInterval(function () {
+                   if (!context.container().select('div.combobox').empty()) {
+                     window.clearInterval(watcher);
+                     continueTo(chooseDescriptionField);
+                   }
+                 }, 300);
+               });
+             }, 300); // after "Add Field" visible
+           }, 400); // after editor pane visible
 
-               list = list.enter()
-                   .append('ul')
-                   .attr('class', 'member-list')
-                   .merge(list);
+           context.on('exit.intro', function () {
+             return continueTo(searchPresets);
+           });
 
+           function continueTo(nextStep) {
+             context.container().select('.inspector-wrap').on('wheel.intro', null);
+             context.container().select('.more-fields .combobox-input').on('click.intro', null);
+             context.on('exit.intro', null);
+             nextStep();
+           }
+         }
 
-               var items = list.selectAll('li.member-row-normal')
-                   .data(memberships, function(d) {
-                       return osmEntity.key(d.relation) + ',' + d.index;
-                   });
+         function chooseDescriptionField() {
+           if (!_areaID || !context.hasEntity(_areaID)) {
+             return addArea();
+           }
 
-               items.exit()
-                   .each(unbind)
-                   .remove();
-
-               // Enter
-               var itemsEnter = items.enter()
-                   .append('li')
-                   .attr('class', 'member-row member-row-normal form-field');
-
-               // highlight the relation in the map while hovering on the list item
-               itemsEnter.on('mouseover', function(d) {
-                       utilHighlightEntities([d.relation.id], true, context);
-                   })
-                   .on('mouseout', function(d) {
-                       utilHighlightEntities([d.relation.id], false, context);
-                   });
+           var ids = context.selectedIDs();
 
-               var labelEnter = itemsEnter
-                   .append('label')
-                   .attr('class', 'field-label')
-                   .attr('for', function(d) {
-                       return d.domId;
-                   });
+           if (context.mode().id !== 'select' || !ids.length || ids[0] !== _areaID) {
+             return searchPresets();
+           }
 
-               var labelLink = labelEnter
-                   .append('span')
-                   .attr('class', 'label-text')
-                   .append('a')
-                   .attr('href', '#')
-                   .on('click', selectRelation);
-
-               labelLink
-                   .append('span')
-                   .attr('class', 'member-entity-type')
-                   .text(function(d) {
-                       var matched = _mainPresetIndex.match(d.relation, context.graph());
-                       return (matched && matched.name()) || _t('inspector.relation');
-                   });
+           if (!context.container().select('.form-field-description').empty()) {
+             return continueTo(describePlayground);
+           } // Make sure combobox is ready..
 
-               labelLink
-                   .append('span')
-                   .attr('class', 'member-entity-name')
-                   .text(function(d) { return utilDisplayName(d.relation); });
-
-               labelEnter
-                   .append('button')
-                   .attr('tabindex', -1)
-                   .attr('class', 'remove member-delete')
-                   .call(svgIcon('#iD-operation-delete'))
-                   .on('click', deleteMembership);
-
-               labelEnter
-                   .append('button')
-                   .attr('class', 'member-zoom')
-                   .attr('title', _t('icons.zoom_to'))
-                   .call(svgIcon('#iD-icon-framed-dot', 'monochrome'))
-                   .on('click', zoomToRelation);
-
-               var wrapEnter = itemsEnter
-                   .append('div')
-                   .attr('class', 'form-field-input-wrap form-field-input-member');
-
-               wrapEnter
-                   .append('input')
-                   .attr('class', 'member-role')
-                   .attr('id', function(d) {
-                       return d.domId;
-                   })
-                   .property('type', 'text')
-                   .attr('placeholder', _t('inspector.role'))
-                   .call(utilNoAuto)
-                   .property('value', function(d) { return d.member.role; })
-                   .on('blur', changeRole)
-                   .on('change', changeRole);
-
-               if (taginfo) {
-                   wrapEnter.each(bindTypeahead);
-               }
-
-
-               var newMembership = list.selectAll('.member-row-new')
-                   .data(_showBlank ? [0] : []);
-
-               // Exit
-               newMembership.exit()
-                   .remove();
-
-               // Enter
-               var newMembershipEnter = newMembership.enter()
-                   .append('li')
-                   .attr('class', 'member-row member-row-new form-field');
-
-               var newLabelEnter = newMembershipEnter
-                   .append('label')
-                   .attr('class', 'field-label');
-
-               newLabelEnter
-                   .append('input')
-                   .attr('placeholder', _t('inspector.choose_relation'))
-                   .attr('type', 'text')
-                   .attr('class', 'member-entity-input')
-                   .call(utilNoAuto);
-
-               newLabelEnter
-                   .append('button')
-                   .attr('tabindex', -1)
-                   .attr('class', 'remove member-delete')
-                   .call(svgIcon('#iD-operation-delete'))
-                   .on('click', function() {
-                       list.selectAll('.member-row-new')
-                           .remove();
-                   });
 
-               var newWrapEnter = newMembershipEnter
-                   .append('div')
-                   .attr('class', 'form-field-input-wrap form-field-input-member');
+           if (context.container().select('div.combobox').empty()) {
+             return continueTo(clickAddField);
+           } // Watch for the combobox to go away..
 
-               newWrapEnter
-                   .append('input')
-                   .attr('class', 'member-role')
-                   .property('type', 'text')
-                   .attr('placeholder', _t('inspector.role'))
-                   .call(utilNoAuto);
 
-               // Update
-               newMembership = newMembership
-                   .merge(newMembershipEnter);
+           var watcher;
+           watcher = window.setInterval(function () {
+             if (context.container().select('div.combobox').empty()) {
+               window.clearInterval(watcher);
+               timeout(function () {
+                 if (context.container().select('.form-field-description').empty()) {
+                   continueTo(retryChooseDescription);
+                 } else {
+                   continueTo(describePlayground);
+                 }
+               }, 300); // after description field added.
+             }
+           }, 300);
+           reveal('div.combobox', helpHtml('intro.areas.choose_field', {
+             field: descriptionField.label()
+           }), {
+             duration: 300
+           });
+           context.on('exit.intro', function () {
+             return continueTo(searchPresets);
+           });
+
+           function continueTo(nextStep) {
+             if (watcher) window.clearInterval(watcher);
+             context.on('exit.intro', null);
+             nextStep();
+           }
+         }
 
-               newMembership.selectAll('.member-entity-input')
-                   .on('blur', cancelEntity)   // if it wasn't accepted normally, cancel it
-                   .call(nearbyCombo
-                       .on('accept', acceptEntity)
-                       .on('cancel', cancelEntity)
-                   );
+         function describePlayground() {
+           if (!_areaID || !context.hasEntity(_areaID)) {
+             return addArea();
+           }
 
+           var ids = context.selectedIDs();
 
-               // Container for the Add button
-               var addRow = selection.selectAll('.add-row')
-                   .data([0]);
+           if (context.mode().id !== 'select' || !ids.length || ids[0] !== _areaID) {
+             return searchPresets();
+           } // reset pane, in case user happened to change it..
 
-               // enter
-               var addRowEnter = addRow.enter()
-                   .append('div')
-                   .attr('class', 'add-row');
 
-               var addRelationButton = addRowEnter
-                   .append('button')
-                   .attr('class', 'add-relation');
+           context.container().select('.inspector-wrap .panewrap').style('right', '0%');
+
+           if (context.container().select('.form-field-description').empty()) {
+             return continueTo(retryChooseDescription);
+           }
+
+           context.on('exit.intro', function () {
+             continueTo(play);
+           });
+           reveal('.entity-editor-pane', helpHtml('intro.areas.describe_playground', {
+             button: icon('#iD-icon-close', 'inline')
+           }), {
+             duration: 300
+           });
+
+           function continueTo(nextStep) {
+             context.on('exit.intro', null);
+             nextStep();
+           }
+         }
 
-               addRelationButton
-                   .call(svgIcon('#iD-icon-plus', 'light'));
-               addRelationButton
-                   .call(uiTooltip().title(_t('inspector.add_to_relation')).placement(_mainLocalizer.textDirection() === 'ltr' ? 'right' : 'left'));
+         function retryChooseDescription() {
+           if (!_areaID || !context.hasEntity(_areaID)) {
+             return addArea();
+           }
 
-               addRowEnter
-                   .append('div')
-                   .attr('class', 'space-value');   // preserve space
+           var ids = context.selectedIDs();
 
-               addRowEnter
-                   .append('div')
-                   .attr('class', 'space-buttons');  // preserve space
+           if (context.mode().id !== 'select' || !ids.length || ids[0] !== _areaID) {
+             return searchPresets();
+           } // reset pane, in case user happened to change it..
 
-               // update
-               addRow = addRow
-                   .merge(addRowEnter);
 
-               addRow.select('.add-relation')
-                   .on('click', function() {
-                       _showBlank = true;
-                       section.reRender();
-                       list.selectAll('.member-entity-input').node().focus();
-                   });
+           context.container().select('.inspector-wrap .panewrap').style('right', '0%');
+           reveal('.entity-editor-pane', helpHtml('intro.areas.retry_add_field', {
+             field: descriptionField.label()
+           }), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: function buttonCallback() {
+               continueTo(clickAddField);
+             }
+           });
+           context.on('exit.intro', function () {
+             return continueTo(searchPresets);
+           });
 
+           function continueTo(nextStep) {
+             context.on('exit.intro', null);
+             nextStep();
+           }
+         }
 
-               function acceptEntity(d) {
-                   if (!d) {
-                       cancelEntity();
-                       return;
-                   }
-                   // remove hover-higlighting
-                   if (d.relation) utilHighlightEntities([d.relation.id], false, context);
+         function play() {
+           dispatch$1.call('done');
+           reveal('.ideditor', helpHtml('intro.areas.play', {
+             next: _t('intro.lines.title')
+           }), {
+             tooltipBox: '.intro-nav-wrap .chapter-line',
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: function buttonCallback() {
+               reveal('.ideditor');
+             }
+           });
+         }
 
-                   var role = context.cleanRelationRole(list.selectAll('.member-row-new .member-role').property('value'));
-                   addMembership(d, role);
-               }
+         chapter.enter = function () {
+           addArea();
+         };
 
+         chapter.exit = function () {
+           timeouts.forEach(window.clearTimeout);
+           context.on('enter.intro exit.intro', null);
+           context.map().on('move.intro drawn.intro', null);
+           context.history().on('change.intro', null);
+           context.container().select('.inspector-wrap').on('wheel.intro', null);
+           context.container().select('.preset-search-input').on('keydown.intro keyup.intro', null);
+           context.container().select('.more-fields .combobox-input').on('click.intro', null);
+         };
 
-               function cancelEntity() {
-                   var input = newMembership.selectAll('.member-entity-input');
-                   input.property('value', '');
+         chapter.restart = function () {
+           chapter.exit();
+           chapter.enter();
+         };
 
-                   // remove hover-higlighting
-                   context.surface().selectAll('.highlighted')
-                       .classed('highlighted', false);
-               }
+         return utilRebind(chapter, dispatch$1, 'on');
+       }
 
+       function uiIntroLine(context, reveal) {
+         var dispatch$1 = dispatch('done');
+         var timeouts = [];
+         var _tulipRoadID = null;
+         var flowerRoadID = 'w646';
+         var tulipRoadStart = [-85.6297754121684, 41.95805253325314];
+         var tulipRoadMidpoint = [-85.62975395449628, 41.95787501510204];
+         var tulipRoadIntersection = [-85.62974496187628, 41.95742515554585];
+         var roadCategory = _mainPresetIndex.item('category-road_minor');
+         var residentialPreset = _mainPresetIndex.item('highway/residential');
+         var woodRoadID = 'w525';
+         var woodRoadEndID = 'n2862';
+         var woodRoadAddNode = [-85.62390110349587, 41.95397111462291];
+         var woodRoadDragEndpoint = [-85.623867390213, 41.95466987786487];
+         var woodRoadDragMidpoint = [-85.62386254803509, 41.95430395953872];
+         var washingtonStreetID = 'w522';
+         var twelfthAvenueID = 'w1';
+         var eleventhAvenueEndID = 'n3550';
+         var twelfthAvenueEndID = 'n5';
+         var _washingtonSegmentID = null;
+         var eleventhAvenueEnd = context.entity(eleventhAvenueEndID).loc;
+         var twelfthAvenueEnd = context.entity(twelfthAvenueEndID).loc;
+         var deleteLinesLoc = [-85.6219395542764, 41.95228033922477];
+         var twelfthAvenue = [-85.62219310052491, 41.952505413152956];
+         var chapter = {
+           title: 'intro.lines.title'
+         };
+
+         function timeout(f, t) {
+           timeouts.push(window.setTimeout(f, t));
+         }
+
+         function eventCancel(d3_event) {
+           d3_event.stopPropagation();
+           d3_event.preventDefault();
+         }
+
+         function addLine() {
+           context.enter(modeBrowse(context));
+           context.history().reset('initial');
+           var msec = transitionTime(tulipRoadStart, context.map().center());
 
-               function bindTypeahead(d) {
-                   var row = select(this);
-                   var role = row.selectAll('input.member-role');
-                   var origValue = role.property('value');
+           if (msec) {
+             reveal(null, null, {
+               duration: 0
+             });
+           }
 
-                   function sort(value, data) {
-                       var sameletter = [];
-                       var other = [];
-                       for (var i = 0; i < data.length; i++) {
-                           if (data[i].value.substring(0, value.length) === value) {
-                               sameletter.push(data[i]);
-                           } else {
-                               other.push(data[i]);
-                           }
-                       }
-                       return sameletter.concat(other);
-                   }
+           context.map().centerZoomEase(tulipRoadStart, 18.5, msec);
+           timeout(function () {
+             var tooltip = reveal('button.add-line', helpHtml('intro.lines.add_line'));
+             tooltip.selectAll('.popover-inner').insert('svg', 'span').attr('class', 'tooltip-illustration').append('use').attr('xlink:href', '#iD-graphic-lines');
+             context.on('enter.intro', function (mode) {
+               if (mode.id !== 'add-line') return;
+               continueTo(startLine);
+             });
+           }, msec + 100);
+
+           function continueTo(nextStep) {
+             context.on('enter.intro', null);
+             nextStep();
+           }
+         }
+
+         function startLine() {
+           if (context.mode().id !== 'add-line') return chapter.restart();
+           _tulipRoadID = null;
+           var padding = 70 * Math.pow(2, context.map().zoom() - 18);
+           var box = pad(tulipRoadStart, padding, context);
+           box.height = box.height + 100;
+           var textId = context.lastPointerType() === 'mouse' ? 'start_line' : 'start_line_tap';
+           var startLineString = helpHtml('intro.lines.missing_road') + '{br}' + helpHtml('intro.lines.line_draw_info') + helpHtml('intro.lines.' + textId);
+           reveal(box, startLineString);
+           context.map().on('move.intro drawn.intro', function () {
+             padding = 70 * Math.pow(2, context.map().zoom() - 18);
+             box = pad(tulipRoadStart, padding, context);
+             box.height = box.height + 100;
+             reveal(box, startLineString, {
+               duration: 0
+             });
+           });
+           context.on('enter.intro', function (mode) {
+             if (mode.id !== 'draw-line') return chapter.restart();
+             continueTo(drawLine);
+           });
 
-                   role.call(uiCombobox(context, 'member-role')
-                       .fetcher(function(role, callback) {
-                           var rtype = d.relation.tags.type;
-                           taginfo.roles({
-                               debounce: true,
-                               rtype: rtype || '',
-                               geometry: context.graph().geometry(entityID),
-                               query: role
-                           }, function(err, data) {
-                               if (!err) callback(sort(role, data));
-                           });
-                       })
-                       .on('cancel', function() {
-                           role.property('value', origValue);
-                       })
-                   );
-               }
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.on('enter.intro', null);
+             nextStep();
+           }
+         }
 
+         function drawLine() {
+           if (context.mode().id !== 'draw-line') return chapter.restart();
+           _tulipRoadID = context.mode().selectedIDs()[0];
+           context.map().centerEase(tulipRoadMidpoint, 500);
+           timeout(function () {
+             var padding = 200 * Math.pow(2, context.map().zoom() - 18.5);
+             var box = pad(tulipRoadMidpoint, padding, context);
+             box.height = box.height * 2;
+             reveal(box, helpHtml('intro.lines.intersect', {
+               name: _t('intro.graph.name.flower-street')
+             }));
+             context.map().on('move.intro drawn.intro', function () {
+               padding = 200 * Math.pow(2, context.map().zoom() - 18.5);
+               box = pad(tulipRoadMidpoint, padding, context);
+               box.height = box.height * 2;
+               reveal(box, helpHtml('intro.lines.intersect', {
+                 name: _t('intro.graph.name.flower-street')
+               }), {
+                 duration: 0
+               });
+             });
+           }, 550); // after easing..
 
-               function unbind() {
-                   var row = select(this);
+           context.history().on('change.intro', function () {
+             if (isLineConnected()) {
+               continueTo(continueLine);
+             }
+           });
+           context.on('enter.intro', function (mode) {
+             if (mode.id === 'draw-line') {
+               return;
+             } else if (mode.id === 'select') {
+               continueTo(retryIntersect);
+               return;
+             } else {
+               return chapter.restart();
+             }
+           });
 
-                   row.selectAll('input.member-role')
-                       .call(uiCombobox.off, context);
-               }
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.history().on('change.intro', null);
+             context.on('enter.intro', null);
+             nextStep();
            }
+         }
 
+         function isLineConnected() {
+           var entity = _tulipRoadID && context.hasEntity(_tulipRoadID);
 
-           section.entityIDs = function(val) {
-               if (!arguments.length) return _entityIDs;
-               _entityIDs = val;
-               _showBlank = false;
-               return section;
-           };
-
+           if (!entity) return false;
+           var drawNodes = context.graph().childNodes(entity);
+           return drawNodes.some(function (node) {
+             return context.graph().parentWays(node).some(function (parent) {
+               return parent.id === flowerRoadID;
+             });
+           });
+         }
 
-           return section;
-       }
+         function retryIntersect() {
+           select(window).on('pointerdown.intro mousedown.intro', eventCancel, true);
+           var box = pad(tulipRoadIntersection, 80, context);
+           reveal(box, helpHtml('intro.lines.retry_intersect', {
+             name: _t('intro.graph.name.flower-street')
+           }));
+           timeout(chapter.restart, 3000);
+         }
 
-       function uiSectionSelectionList(context) {
+         function continueLine() {
+           if (context.mode().id !== 'draw-line') return chapter.restart();
 
-           var _selectedIDs = [];
+           var entity = _tulipRoadID && context.hasEntity(_tulipRoadID);
 
-           var section = uiSection('selected-features', context)
-               .shouldDisplay(function() {
-                   return _selectedIDs.length > 1;
-               })
-               .title(function() {
-                   return _t('inspector.title_count', { title: _t('inspector.features'), count: _selectedIDs.length });
-               })
-               .disclosureContent(renderDisclosureContent);
+           if (!entity) return chapter.restart();
+           context.map().centerEase(tulipRoadIntersection, 500);
+           var continueLineText = helpHtml('intro.lines.continue_line') + '{br}' + helpHtml('intro.lines.finish_line_' + (context.lastPointerType() === 'mouse' ? 'click' : 'tap')) + helpHtml('intro.lines.finish_road');
+           reveal('.surface', continueLineText);
+           context.on('enter.intro', function (mode) {
+             if (mode.id === 'draw-line') return;else if (mode.id === 'select') return continueTo(chooseCategoryRoad);else return chapter.restart();
+           });
 
-           context.history()
-               .on('change.selectionList', function(difference) {
-                   if (difference) {
-                       section.reRender();
-                   }
-               });
+           function continueTo(nextStep) {
+             context.on('enter.intro', null);
+             nextStep();
+           }
+         }
 
-           section.entityIDs = function(val) {
-               if (!arguments.length) return _selectedIDs;
-               _selectedIDs = val;
-               return section;
-           };
+         function chooseCategoryRoad() {
+           if (context.mode().id !== 'select') return chapter.restart();
+           context.on('exit.intro', function () {
+             return chapter.restart();
+           });
+           var button = context.container().select('.preset-category-road_minor .preset-list-button');
+           if (button.empty()) return chapter.restart(); // disallow scrolling
+
+           context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+           timeout(function () {
+             // reset pane, in case user somehow happened to change it..
+             context.container().select('.inspector-wrap .panewrap').style('right', '-100%');
+             reveal(button.node(), helpHtml('intro.lines.choose_category_road', {
+               category: roadCategory.name()
+             }));
+             button.on('click.intro', function () {
+               continueTo(choosePresetResidential);
+             });
+           }, 400); // after editor pane visible
 
-           function selectEntity(entity) {
-               context.enter(modeSelect(context, [entity.id]));
+           function continueTo(nextStep) {
+             context.container().select('.inspector-wrap').on('wheel.intro', null);
+             context.container().select('.preset-list-button').on('click.intro', null);
+             context.on('exit.intro', null);
+             nextStep();
            }
+         }
 
-           function deselectEntity(entity) {
-               event.stopPropagation();
+         function choosePresetResidential() {
+           if (context.mode().id !== 'select') return chapter.restart();
+           context.on('exit.intro', function () {
+             return chapter.restart();
+           });
+           var subgrid = context.container().select('.preset-category-road_minor .subgrid');
+           if (subgrid.empty()) return chapter.restart();
+           subgrid.selectAll(':not(.preset-highway-residential) .preset-list-button').on('click.intro', function () {
+             continueTo(retryPresetResidential);
+           });
+           subgrid.selectAll('.preset-highway-residential .preset-list-button').on('click.intro', function () {
+             continueTo(nameRoad);
+           });
+           timeout(function () {
+             reveal(subgrid.node(), helpHtml('intro.lines.choose_preset_residential', {
+               preset: residentialPreset.name()
+             }), {
+               tooltipBox: '.preset-highway-residential .preset-list-button',
+               duration: 300
+             });
+           }, 300);
 
-               var selectedIDs = _selectedIDs.slice();
-               var index = selectedIDs.indexOf(entity.id);
-               if (index > -1) {
-                   selectedIDs.splice(index, 1);
-                   context.enter(modeSelect(context, selectedIDs));
-               }
+           function continueTo(nextStep) {
+             context.container().select('.preset-list-button').on('click.intro', null);
+             context.on('exit.intro', null);
+             nextStep();
            }
+         } // selected wrong road type
 
-           function renderDisclosureContent(selection) {
 
-               var list = selection.selectAll('.feature-list')
-                   .data([0]);
-
-               list = list.enter()
-                   .append('div')
-                   .attr('class', 'feature-list')
-                   .merge(list);
+         function retryPresetResidential() {
+           if (context.mode().id !== 'select') return chapter.restart();
+           context.on('exit.intro', function () {
+             return chapter.restart();
+           }); // disallow scrolling
 
-               var entities = _selectedIDs
-                   .map(function(id) { return context.hasEntity(id); })
-                   .filter(Boolean);
+           context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+           timeout(function () {
+             var button = context.container().select('.entity-editor-pane .preset-list-button');
+             reveal(button.node(), helpHtml('intro.lines.retry_preset_residential', {
+               preset: residentialPreset.name()
+             }));
+             button.on('click.intro', function () {
+               continueTo(chooseCategoryRoad);
+             });
+           }, 500);
 
-               var items = list.selectAll('.feature-list-item')
-                   .data(entities, osmEntity.key);
+           function continueTo(nextStep) {
+             context.container().select('.inspector-wrap').on('wheel.intro', null);
+             context.container().select('.preset-list-button').on('click.intro', null);
+             context.on('exit.intro', null);
+             nextStep();
+           }
+         }
 
-               items.exit()
-                   .remove();
+         function nameRoad() {
+           context.on('exit.intro', function () {
+             continueTo(didNameRoad);
+           });
+           timeout(function () {
+             reveal('.entity-editor-pane', helpHtml('intro.lines.name_road', {
+               button: icon('#iD-icon-close', 'inline')
+             }), {
+               tooltipClass: 'intro-lines-name_road'
+             });
+           }, 500);
 
-               // Enter
-               var enter = items.enter()
-                   .append('div')
-                   .attr('class', 'feature-list-item')
-                   .on('click', selectEntity);
+           function continueTo(nextStep) {
+             context.on('exit.intro', null);
+             nextStep();
+           }
+         }
 
-               enter
-                   .each(function(d) {
-                       select(this).on('mouseover', function() {
-                           utilHighlightEntities([d.id], true, context);
-                       });
-                       select(this).on('mouseout', function() {
-                           utilHighlightEntities([d.id], false, context);
-                       });
-                   });
+         function didNameRoad() {
+           context.history().checkpoint('doneAddLine');
+           timeout(function () {
+             reveal('.surface', helpHtml('intro.lines.did_name_road'), {
+               buttonText: _t.html('intro.ok'),
+               buttonCallback: function buttonCallback() {
+                 continueTo(updateLine);
+               }
+             });
+           }, 500);
 
-               var label = enter
-                   .append('button')
-                   .attr('class', 'label');
-
-               enter
-                   .append('button')
-                   .attr('class', 'close')
-                   .attr('title', _t('icons.deselect'))
-                   .on('click', deselectEntity)
-                   .call(svgIcon('#iD-icon-close'));
-
-               label
-                   .append('span')
-                   .attr('class', 'entity-geom-icon')
-                   .call(svgIcon('', 'pre-text'));
-
-               label
-                   .append('span')
-                   .attr('class', 'entity-type');
-
-               label
-                   .append('span')
-                   .attr('class', 'entity-name');
-
-               // Update
-               items = items.merge(enter);
-
-               items.selectAll('.entity-geom-icon use')
-                   .attr('href', function() {
-                       var entity = this.parentNode.parentNode.__data__;
-                       return '#iD-icon-' + entity.geometry(context.graph());
-                   });
+           function continueTo(nextStep) {
+             nextStep();
+           }
+         }
 
-               items.selectAll('.entity-type')
-                   .text(function(entity) { return _mainPresetIndex.match(entity, context.graph()).name(); });
+         function updateLine() {
+           context.history().reset('doneAddLine');
 
-               items.selectAll('.entity-name')
-                   .text(function(d) {
-                       // fetch latest entity
-                       var entity = context.entity(d.id);
-                       return utilDisplayName(entity);
-                   });
+           if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
+             return chapter.restart();
            }
 
-           return section;
-       }
+           var msec = transitionTime(woodRoadDragMidpoint, context.map().center());
 
-       function uiEntityEditor(context) {
-           var dispatch$1 = dispatch('choose');
-           var _state = 'select';
-           var _coalesceChanges = false;
-           var _modified = false;
-           var _base;
-           var _entityIDs;
-           var _activePresets = [];
-           var _newFeature;
+           if (msec) {
+             reveal(null, null, {
+               duration: 0
+             });
+           }
 
-           var _sections;
+           context.map().centerZoomEase(woodRoadDragMidpoint, 19, msec);
+           timeout(function () {
+             var padding = 250 * Math.pow(2, context.map().zoom() - 19);
+             var box = pad(woodRoadDragMidpoint, padding, context);
 
-           function entityEditor(selection) {
+             var advance = function advance() {
+               continueTo(addNode);
+             };
 
-               var combinedTags = utilCombinedTags(_entityIDs, context.graph());
+             reveal(box, helpHtml('intro.lines.update_line'), {
+               buttonText: _t.html('intro.ok'),
+               buttonCallback: advance
+             });
+             context.map().on('move.intro drawn.intro', function () {
+               var padding = 250 * Math.pow(2, context.map().zoom() - 19);
+               var box = pad(woodRoadDragMidpoint, padding, context);
+               reveal(box, helpHtml('intro.lines.update_line'), {
+                 duration: 0,
+                 buttonText: _t.html('intro.ok'),
+                 buttonCallback: advance
+               });
+             });
+           }, msec + 100);
 
-               // Header
-               var header = selection.selectAll('.header')
-                   .data([0]);
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             nextStep();
+           }
+         }
 
-               // Enter
-               var headerEnter = header.enter()
-                   .append('div')
-                   .attr('class', 'header fillL cf');
+         function addNode() {
+           context.history().reset('doneAddLine');
 
-               headerEnter
-                   .append('button')
-                   .attr('class', 'preset-reset preset-choose')
-                   .call(svgIcon((_mainLocalizer.textDirection() === 'rtl') ? '#iD-icon-forward' : '#iD-icon-backward'));
+           if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
+             return chapter.restart();
+           }
 
-               headerEnter
-                   .append('button')
-                   .attr('class', 'close')
-                   .on('click', function() { context.enter(modeBrowse(context)); })
-                   .call(svgIcon(_modified ? '#iD-icon-apply' : '#iD-icon-close'));
+           var padding = 40 * Math.pow(2, context.map().zoom() - 19);
+           var box = pad(woodRoadAddNode, padding, context);
+           var addNodeString = helpHtml('intro.lines.add_node' + (context.lastPointerType() === 'mouse' ? '' : '_touch'));
+           reveal(box, addNodeString);
+           context.map().on('move.intro drawn.intro', function () {
+             var padding = 40 * Math.pow(2, context.map().zoom() - 19);
+             var box = pad(woodRoadAddNode, padding, context);
+             reveal(box, addNodeString, {
+               duration: 0
+             });
+           });
+           context.history().on('change.intro', function (changed) {
+             if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
+               return continueTo(updateLine);
+             }
 
-               headerEnter
-                   .append('h3');
+             if (changed.created().length === 1) {
+               timeout(function () {
+                 continueTo(startDragEndpoint);
+               }, 500);
+             }
+           });
+           context.on('enter.intro', function (mode) {
+             if (mode.id !== 'select') {
+               continueTo(updateLine);
+             }
+           });
 
-               // Update
-               header = header
-                   .merge(headerEnter);
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.history().on('change.intro', null);
+             context.on('enter.intro', null);
+             nextStep();
+           }
+         }
 
-               header.selectAll('h3')
-                   .text(_entityIDs.length === 1 ? _t('inspector.edit') : _t('inspector.edit_features'));
+         function startDragEndpoint() {
+           if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
+             return continueTo(updateLine);
+           }
 
-               header.selectAll('.preset-reset')
-                   .on('click', function() {
-                       dispatch$1.call('choose', this, _activePresets);
-                   });
+           var padding = 100 * Math.pow(2, context.map().zoom() - 19);
+           var box = pad(woodRoadDragEndpoint, padding, context);
+           var startDragString = helpHtml('intro.lines.start_drag_endpoint' + (context.lastPointerType() === 'mouse' ? '' : '_touch')) + helpHtml('intro.lines.drag_to_intersection');
+           reveal(box, startDragString);
+           context.map().on('move.intro drawn.intro', function () {
+             if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
+               return continueTo(updateLine);
+             }
 
-               // Body
-               var body = selection.selectAll('.inspector-body')
-                   .data([0]);
+             var padding = 100 * Math.pow(2, context.map().zoom() - 19);
+             var box = pad(woodRoadDragEndpoint, padding, context);
+             reveal(box, startDragString, {
+               duration: 0
+             });
+             var entity = context.entity(woodRoadEndID);
 
-               // Enter
-               var bodyEnter = body.enter()
-                   .append('div')
-                   .attr('class', 'entity-editor inspector-body sep-top');
-
-               // Update
-               body = body
-                   .merge(bodyEnter);
-
-               if (!_sections) {
-                   _sections = [
-                       uiSectionSelectionList(context),
-                       uiSectionFeatureType(context).on('choose', function(presets) {
-                           dispatch$1.call('choose', this, presets);
-                       }),
-                       uiSectionEntityIssues(context),
-                       uiSectionPresetFields(context).on('change', changeTags).on('revert', revertTags),
-                       uiSectionRawTagEditor('raw-tag-editor', context).on('change', changeTags),
-                       uiSectionRawMemberEditor(context),
-                       uiSectionRawMembershipEditor(context)
-                   ];
-               }
-
-               _sections.forEach(function(section) {
-                   if (section.entityIDs) {
-                       section.entityIDs(_entityIDs);
-                   }
-                   if (section.presets) {
-                       section.presets(_activePresets);
-                   }
-                   if (section.tags) {
-                       section.tags(combinedTags);
-                   }
-                   if (section.state) {
-                       section.state(_state);
-                   }
-                   body.call(section.render);
-               });
+             if (geoSphericalDistance(entity.loc, woodRoadDragEndpoint) <= 4) {
+               continueTo(finishDragEndpoint);
+             }
+           });
 
-               body
-                   .selectAll('.key-trap-wrap')
-                   .data([0])
-                   .enter()
-                   .append('div')
-                   .attr('class', 'key-trap-wrap')
-                   .append('input')
-                   .attr('type', 'text')
-                   .attr('class', 'key-trap')
-                   .on('keydown.key-trap', function() {
-                       // On tabbing, send focus back to the first field on the inspector-body
-                       // (probably the `name` field) #4159
-                       if (event.keyCode === 9 && !event.shiftKey) {
-                           event.preventDefault();
-                           body.select('input').node().focus();
-                       }
-                   });
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             nextStep();
+           }
+         }
 
-               context.history()
-                   .on('change.entity-editor', historyChanged);
+         function finishDragEndpoint() {
+           if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
+             return continueTo(updateLine);
+           }
 
-               function historyChanged(difference) {
-                   if (selection.selectAll('.entity-editor').empty()) return;
-                   if (_state === 'hide') return;
-                   var significant = !difference ||
-                           difference.didChange.properties ||
-                           difference.didChange.addition ||
-                           difference.didChange.deletion;
-                   if (!significant) return;
+           var padding = 100 * Math.pow(2, context.map().zoom() - 19);
+           var box = pad(woodRoadDragEndpoint, padding, context);
+           var finishDragString = helpHtml('intro.lines.spot_looks_good') + helpHtml('intro.lines.finish_drag_endpoint' + (context.lastPointerType() === 'mouse' ? '' : '_touch'));
+           reveal(box, finishDragString);
+           context.map().on('move.intro drawn.intro', function () {
+             if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
+               return continueTo(updateLine);
+             }
 
-                   _entityIDs = _entityIDs.filter(context.hasEntity);
-                   if (!_entityIDs.length) return;
+             var padding = 100 * Math.pow(2, context.map().zoom() - 19);
+             var box = pad(woodRoadDragEndpoint, padding, context);
+             reveal(box, finishDragString, {
+               duration: 0
+             });
+             var entity = context.entity(woodRoadEndID);
 
-                   var priorActivePreset = _activePresets.length === 1 && _activePresets[0];
+             if (geoSphericalDistance(entity.loc, woodRoadDragEndpoint) > 4) {
+               continueTo(startDragEndpoint);
+             }
+           });
+           context.on('enter.intro', function () {
+             continueTo(startDragMidpoint);
+           });
 
-                   loadActivePresets();
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.on('enter.intro', null);
+             nextStep();
+           }
+         }
 
-                   var graph = context.graph();
-                   entityEditor.modified(_base !== graph);
-                   entityEditor(selection);
+         function startDragMidpoint() {
+           if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
+             return continueTo(updateLine);
+           }
 
-                   if (priorActivePreset && _activePresets.length === 1 && priorActivePreset !== _activePresets[0]) {
-                       // flash the button to indicate the preset changed
-                       context.container().selectAll('.entity-editor button.preset-reset .label')
-                           .style('background-color', '#fff')
-                           .transition()
-                           .duration(750)
-                           .style('background-color', null);
-                   }
-               }
+           if (context.selectedIDs().indexOf(woodRoadID) === -1) {
+             context.enter(modeSelect(context, [woodRoadID]));
            }
 
+           var padding = 80 * Math.pow(2, context.map().zoom() - 19);
+           var box = pad(woodRoadDragMidpoint, padding, context);
+           reveal(box, helpHtml('intro.lines.start_drag_midpoint'));
+           context.map().on('move.intro drawn.intro', function () {
+             if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
+               return continueTo(updateLine);
+             }
+
+             var padding = 80 * Math.pow(2, context.map().zoom() - 19);
+             var box = pad(woodRoadDragMidpoint, padding, context);
+             reveal(box, helpHtml('intro.lines.start_drag_midpoint'), {
+               duration: 0
+             });
+           });
+           context.history().on('change.intro', function (changed) {
+             if (changed.created().length === 1) {
+               continueTo(continueDragMidpoint);
+             }
+           });
+           context.on('enter.intro', function (mode) {
+             if (mode.id !== 'select') {
+               // keep Wood Road selected so midpoint triangles are drawn..
+               context.enter(modeSelect(context, [woodRoadID]));
+             }
+           });
 
-           // Tag changes that fire on input can all get coalesced into a single
-           // history operation when the user leaves the field.  #2342
-           // Use explicit entityIDs in case the selection changes before the event is fired.
-           function changeTags(entityIDs, changed, onInput) {
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.history().on('change.intro', null);
+             context.on('enter.intro', null);
+             nextStep();
+           }
+         }
 
-               var actions = [];
-               for (var i in entityIDs) {
-                   var entityID = entityIDs[i];
-                   var entity = context.entity(entityID);
+         function continueDragMidpoint() {
+           if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
+             return continueTo(updateLine);
+           }
 
-                   var tags = Object.assign({}, entity.tags);   // shallow copy
+           var padding = 100 * Math.pow(2, context.map().zoom() - 19);
+           var box = pad(woodRoadDragEndpoint, padding, context);
+           box.height += 400;
 
-                   for (var k in changed) {
-                       if (!k) continue;
-                       var v = changed[k];
-                       if (v !== undefined || tags.hasOwnProperty(k)) {
-                           tags[k] = v;
-                       }
-                   }
+           var advance = function advance() {
+             context.history().checkpoint('doneUpdateLine');
+             continueTo(deleteLines);
+           };
 
-                   if (!onInput) {
-                       tags = utilCleanTags(tags);
-                   }
+           reveal(box, helpHtml('intro.lines.continue_drag_midpoint'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: advance
+           });
+           context.map().on('move.intro drawn.intro', function () {
+             if (!context.hasEntity(woodRoadID) || !context.hasEntity(woodRoadEndID)) {
+               return continueTo(updateLine);
+             }
+
+             var padding = 100 * Math.pow(2, context.map().zoom() - 19);
+             var box = pad(woodRoadDragEndpoint, padding, context);
+             box.height += 400;
+             reveal(box, helpHtml('intro.lines.continue_drag_midpoint'), {
+               duration: 0,
+               buttonText: _t.html('intro.ok'),
+               buttonCallback: advance
+             });
+           });
 
-                   if (!fastDeepEqual(entity.tags, tags)) {
-                       actions.push(actionChangeTags(entityID, tags));
-                   }
-               }
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             nextStep();
+           }
+         }
 
-               if (actions.length) {
-                   var combinedAction = function(graph) {
-                       actions.forEach(function(action) {
-                           graph = action(graph);
-                       });
-                       return graph;
-                   };
+         function deleteLines() {
+           context.history().reset('doneUpdateLine');
+           context.enter(modeBrowse(context));
 
-                   var annotation = _t('operations.change_tags.annotation');
+           if (!context.hasEntity(washingtonStreetID) || !context.hasEntity(twelfthAvenueID) || !context.hasEntity(eleventhAvenueEndID)) {
+             return chapter.restart();
+           }
 
-                   if (_coalesceChanges) {
-                       context.overwrite(combinedAction, annotation);
-                   } else {
-                       context.perform(combinedAction, annotation);
-                       _coalesceChanges = !!onInput;
-                   }
-               }
+           var msec = transitionTime(deleteLinesLoc, context.map().center());
 
-               // if leaving field (blur event), rerun validation
-               if (!onInput) {
-                   context.validator().validate();
-               }
+           if (msec) {
+             reveal(null, null, {
+               duration: 0
+             });
            }
 
-           function revertTags(keys) {
+           context.map().centerZoomEase(deleteLinesLoc, 18, msec);
+           timeout(function () {
+             var padding = 200 * Math.pow(2, context.map().zoom() - 18);
+             var box = pad(deleteLinesLoc, padding, context);
+             box.top -= 200;
+             box.height += 400;
 
-               var actions = [];
-               for (var i in _entityIDs) {
-                   var entityID = _entityIDs[i];
+             var advance = function advance() {
+               continueTo(rightClickIntersection);
+             };
 
-                   var original = context.graph().base().entities[entityID];
-                   var changed = {};
-                   for (var j in keys) {
-                       var key = keys[j];
-                       changed[key] = original ? original.tags[key] : undefined;
-                   }
+             reveal(box, helpHtml('intro.lines.delete_lines', {
+               street: _t('intro.graph.name.12th-avenue')
+             }), {
+               buttonText: _t.html('intro.ok'),
+               buttonCallback: advance
+             });
+             context.map().on('move.intro drawn.intro', function () {
+               var padding = 200 * Math.pow(2, context.map().zoom() - 18);
+               var box = pad(deleteLinesLoc, padding, context);
+               box.top -= 200;
+               box.height += 400;
+               reveal(box, helpHtml('intro.lines.delete_lines', {
+                 street: _t('intro.graph.name.12th-avenue')
+               }), {
+                 duration: 0,
+                 buttonText: _t.html('intro.ok'),
+                 buttonCallback: advance
+               });
+             });
+             context.history().on('change.intro', function () {
+               timeout(function () {
+                 continueTo(deleteLines);
+               }, 500); // after any transition (e.g. if user deleted intersection)
+             });
+           }, msec + 100);
 
-                   var entity = context.entity(entityID);
-                   var tags = Object.assign({}, entity.tags);   // shallow copy
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
+           }
+         }
 
-                   for (var k in changed) {
-                       if (!k) continue;
-                       var v = changed[k];
-                       if (v !== undefined || tags.hasOwnProperty(k)) {
-                           tags[k] = v;
-                       }
-                   }
+         function rightClickIntersection() {
+           context.history().reset('doneUpdateLine');
+           context.enter(modeBrowse(context));
+           context.map().centerZoomEase(eleventhAvenueEnd, 18, 500);
+           var rightClickString = helpHtml('intro.lines.split_street', {
+             street1: _t('intro.graph.name.11th-avenue'),
+             street2: _t('intro.graph.name.washington-street')
+           }) + helpHtml('intro.lines.' + (context.lastPointerType() === 'mouse' ? 'rightclick_intersection' : 'edit_menu_intersection_touch'));
+           timeout(function () {
+             var padding = 60 * Math.pow(2, context.map().zoom() - 18);
+             var box = pad(eleventhAvenueEnd, padding, context);
+             reveal(box, rightClickString);
+             context.map().on('move.intro drawn.intro', function () {
+               var padding = 60 * Math.pow(2, context.map().zoom() - 18);
+               var box = pad(eleventhAvenueEnd, padding, context);
+               reveal(box, rightClickString, {
+                 duration: 0
+               });
+             });
+             context.on('enter.intro', function (mode) {
+               if (mode.id !== 'select') return;
+               var ids = context.selectedIDs();
+               if (ids.length !== 1 || ids[0] !== eleventhAvenueEndID) return;
+               timeout(function () {
+                 var node = selectMenuItem(context, 'split').node();
+                 if (!node) return;
+                 continueTo(splitIntersection);
+               }, 50); // after menu visible
+             });
+             context.history().on('change.intro', function () {
+               timeout(function () {
+                 continueTo(deleteLines);
+               }, 300); // after any transition (e.g. if user deleted intersection)
+             });
+           }, 600);
 
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.on('enter.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
+           }
+         }
 
-                   tags = utilCleanTags(tags);
+         function splitIntersection() {
+           if (!context.hasEntity(washingtonStreetID) || !context.hasEntity(twelfthAvenueID) || !context.hasEntity(eleventhAvenueEndID)) {
+             return continueTo(deleteLines);
+           }
 
-                   if (!fastDeepEqual(entity.tags, tags)) {
-                       actions.push(actionChangeTags(entityID, tags));
-                   }
+           var node = selectMenuItem(context, 'split').node();
 
-               }
+           if (!node) {
+             return continueTo(rightClickIntersection);
+           }
 
-               if (actions.length) {
-                   var combinedAction = function(graph) {
-                       actions.forEach(function(action) {
-                           graph = action(graph);
-                       });
-                       return graph;
-                   };
+           var wasChanged = false;
+           _washingtonSegmentID = null;
+           reveal('.edit-menu', helpHtml('intro.lines.split_intersection', {
+             street: _t('intro.graph.name.washington-street')
+           }), {
+             padding: 50
+           });
+           context.map().on('move.intro drawn.intro', function () {
+             var node = selectMenuItem(context, 'split').node();
 
-                   var annotation = _t('operations.change_tags.annotation');
+             if (!wasChanged && !node) {
+               return continueTo(rightClickIntersection);
+             }
 
-                   if (_coalesceChanges) {
-                       context.overwrite(combinedAction, annotation);
-                   } else {
-                       context.perform(combinedAction, annotation);
-                       _coalesceChanges = false;
-                   }
+             reveal('.edit-menu', helpHtml('intro.lines.split_intersection', {
+               street: _t('intro.graph.name.washington-street')
+             }), {
+               duration: 0,
+               padding: 50
+             });
+           });
+           context.history().on('change.intro', function (changed) {
+             wasChanged = true;
+             timeout(function () {
+               if (context.history().undoAnnotation() === _t('operations.split.annotation.line', {
+                 n: 1
+               })) {
+                 _washingtonSegmentID = changed.created()[0].id;
+                 continueTo(didSplit);
+               } else {
+                 _washingtonSegmentID = null;
+                 continueTo(retrySplit);
                }
+             }, 300); // after any transition (e.g. if user deleted intersection)
+           });
 
-               context.validator().validate();
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
            }
+         }
 
+         function retrySplit() {
+           context.enter(modeBrowse(context));
+           context.map().centerZoomEase(eleventhAvenueEnd, 18, 500);
 
-           entityEditor.modified = function(val) {
-               if (!arguments.length) return _modified;
-               _modified = val;
-               return entityEditor;
+           var advance = function advance() {
+             continueTo(rightClickIntersection);
            };
 
+           var padding = 60 * Math.pow(2, context.map().zoom() - 18);
+           var box = pad(eleventhAvenueEnd, padding, context);
+           reveal(box, helpHtml('intro.lines.retry_split'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: advance
+           });
+           context.map().on('move.intro drawn.intro', function () {
+             var padding = 60 * Math.pow(2, context.map().zoom() - 18);
+             var box = pad(eleventhAvenueEnd, padding, context);
+             reveal(box, helpHtml('intro.lines.retry_split'), {
+               duration: 0,
+               buttonText: _t.html('intro.ok'),
+               buttonCallback: advance
+             });
+           });
 
-           entityEditor.state = function(val) {
-               if (!arguments.length) return _state;
-               _state = val;
-               return entityEditor;
-           };
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             nextStep();
+           }
+         }
 
+         function didSplit() {
+           if (!_washingtonSegmentID || !context.hasEntity(_washingtonSegmentID) || !context.hasEntity(washingtonStreetID) || !context.hasEntity(twelfthAvenueID) || !context.hasEntity(eleventhAvenueEndID)) {
+             return continueTo(rightClickIntersection);
+           }
 
-           entityEditor.entityIDs = function(val) {
-               if (!arguments.length) return _entityIDs;
-               if (val && _entityIDs && utilArrayIdentical(_entityIDs, val)) return entityEditor;  // exit early if no change
+           var ids = context.selectedIDs();
+           var string = 'intro.lines.did_split_' + (ids.length > 1 ? 'multi' : 'single');
+           var street = _t('intro.graph.name.washington-street');
+           var padding = 200 * Math.pow(2, context.map().zoom() - 18);
+           var box = pad(twelfthAvenue, padding, context);
+           box.width = box.width / 2;
+           reveal(box, helpHtml(string, {
+             street1: street,
+             street2: street
+           }), {
+             duration: 500
+           });
+           timeout(function () {
+             context.map().centerZoomEase(twelfthAvenue, 18, 500);
+             context.map().on('move.intro drawn.intro', function () {
+               var padding = 200 * Math.pow(2, context.map().zoom() - 18);
+               var box = pad(twelfthAvenue, padding, context);
+               box.width = box.width / 2;
+               reveal(box, helpHtml(string, {
+                 street1: street,
+                 street2: street
+               }), {
+                 duration: 0
+               });
+             });
+           }, 600); // after initial reveal and curtain cut
 
-               _entityIDs = val;
-               _base = context.graph();
-               _coalesceChanges = false;
+           context.on('enter.intro', function () {
+             var ids = context.selectedIDs();
 
-               loadActivePresets();
+             if (ids.length === 1 && ids[0] === _washingtonSegmentID) {
+               continueTo(multiSelect);
+             }
+           });
+           context.history().on('change.intro', function () {
+             if (!_washingtonSegmentID || !context.hasEntity(_washingtonSegmentID) || !context.hasEntity(washingtonStreetID) || !context.hasEntity(twelfthAvenueID) || !context.hasEntity(eleventhAvenueEndID)) {
+               return continueTo(rightClickIntersection);
+             }
+           });
 
-               return entityEditor
-                   .modified(false);
-           };
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.on('enter.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
+           }
+         }
 
+         function multiSelect() {
+           if (!_washingtonSegmentID || !context.hasEntity(_washingtonSegmentID) || !context.hasEntity(washingtonStreetID) || !context.hasEntity(twelfthAvenueID) || !context.hasEntity(eleventhAvenueEndID)) {
+             return continueTo(rightClickIntersection);
+           }
 
-           entityEditor.newFeature = function(val) {
-               if (!arguments.length) return _newFeature;
-               _newFeature = val;
-               return entityEditor;
-           };
+           var ids = context.selectedIDs();
+           var hasWashington = ids.indexOf(_washingtonSegmentID) !== -1;
+           var hasTwelfth = ids.indexOf(twelfthAvenueID) !== -1;
 
+           if (hasWashington && hasTwelfth) {
+             return continueTo(multiRightClick);
+           } else if (!hasWashington && !hasTwelfth) {
+             return continueTo(didSplit);
+           }
 
-           function loadActivePresets() {
+           context.map().centerZoomEase(twelfthAvenue, 18, 500);
+           timeout(function () {
+             var selected, other, padding, box;
 
-               var graph = context.graph();
+             if (hasWashington) {
+               selected = _t('intro.graph.name.washington-street');
+               other = _t('intro.graph.name.12th-avenue');
+               padding = 60 * Math.pow(2, context.map().zoom() - 18);
+               box = pad(twelfthAvenueEnd, padding, context);
+               box.width *= 3;
+             } else {
+               selected = _t('intro.graph.name.12th-avenue');
+               other = _t('intro.graph.name.washington-street');
+               padding = 200 * Math.pow(2, context.map().zoom() - 18);
+               box = pad(twelfthAvenue, padding, context);
+               box.width /= 2;
+             }
+
+             reveal(box, helpHtml('intro.lines.multi_select', {
+               selected: selected,
+               other1: other
+             }) + ' ' + helpHtml('intro.lines.add_to_selection_' + (context.lastPointerType() === 'mouse' ? 'click' : 'touch'), {
+               selected: selected,
+               other2: other
+             }));
+             context.map().on('move.intro drawn.intro', function () {
+               if (hasWashington) {
+                 selected = _t('intro.graph.name.washington-street');
+                 other = _t('intro.graph.name.12th-avenue');
+                 padding = 60 * Math.pow(2, context.map().zoom() - 18);
+                 box = pad(twelfthAvenueEnd, padding, context);
+                 box.width *= 3;
+               } else {
+                 selected = _t('intro.graph.name.12th-avenue');
+                 other = _t('intro.graph.name.washington-street');
+                 padding = 200 * Math.pow(2, context.map().zoom() - 18);
+                 box = pad(twelfthAvenue, padding, context);
+                 box.width /= 2;
+               }
+
+               reveal(box, helpHtml('intro.lines.multi_select', {
+                 selected: selected,
+                 other1: other
+               }) + ' ' + helpHtml('intro.lines.add_to_selection_' + (context.lastPointerType() === 'mouse' ? 'click' : 'touch'), {
+                 selected: selected,
+                 other2: other
+               }), {
+                 duration: 0
+               });
+             });
+             context.on('enter.intro', function () {
+               continueTo(multiSelect);
+             });
+             context.history().on('change.intro', function () {
+               if (!_washingtonSegmentID || !context.hasEntity(_washingtonSegmentID) || !context.hasEntity(washingtonStreetID) || !context.hasEntity(twelfthAvenueID) || !context.hasEntity(eleventhAvenueEndID)) {
+                 return continueTo(rightClickIntersection);
+               }
+             });
+           }, 600);
 
-               var counts = {};
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.on('enter.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
+           }
+         }
 
-               for (var i in _entityIDs) {
-                   var entity = graph.hasEntity(_entityIDs[i]);
-                   if (!entity) return;
+         function multiRightClick() {
+           if (!_washingtonSegmentID || !context.hasEntity(_washingtonSegmentID) || !context.hasEntity(washingtonStreetID) || !context.hasEntity(twelfthAvenueID) || !context.hasEntity(eleventhAvenueEndID)) {
+             return continueTo(rightClickIntersection);
+           }
 
-                   var match = _mainPresetIndex.match(entity, graph);
+           var padding = 200 * Math.pow(2, context.map().zoom() - 18);
+           var box = pad(twelfthAvenue, padding, context);
+           var rightClickString = helpHtml('intro.lines.multi_select_success') + helpHtml('intro.lines.multi_' + (context.lastPointerType() === 'mouse' ? 'rightclick' : 'edit_menu_touch'));
+           reveal(box, rightClickString);
+           context.map().on('move.intro drawn.intro', function () {
+             var padding = 200 * Math.pow(2, context.map().zoom() - 18);
+             var box = pad(twelfthAvenue, padding, context);
+             reveal(box, rightClickString, {
+               duration: 0
+             });
+           });
+           context.ui().editMenu().on('toggled.intro', function (open) {
+             if (!open) return;
+             timeout(function () {
+               var ids = context.selectedIDs();
 
-                   if (!counts[match.id]) counts[match.id] = 0;
-                   counts[match.id] += 1;
+               if (ids.length === 2 && ids.indexOf(twelfthAvenueID) !== -1 && ids.indexOf(_washingtonSegmentID) !== -1) {
+                 var node = selectMenuItem(context, 'delete').node();
+                 if (!node) return;
+                 continueTo(multiDelete);
+               } else if (ids.length === 1 && ids.indexOf(_washingtonSegmentID) !== -1) {
+                 return continueTo(multiSelect);
+               } else {
+                 return continueTo(didSplit);
                }
+             }, 300); // after edit menu visible
+           });
+           context.history().on('change.intro', function () {
+             if (!_washingtonSegmentID || !context.hasEntity(_washingtonSegmentID) || !context.hasEntity(washingtonStreetID) || !context.hasEntity(twelfthAvenueID) || !context.hasEntity(eleventhAvenueEndID)) {
+               return continueTo(rightClickIntersection);
+             }
+           });
 
-               var matches = Object.keys(counts).sort(function(p1, p2) {
-                   return counts[p2] - counts[p1];
-               }).map(function(pID) {
-                   return _mainPresetIndex.item(pID);
-               });
-
-               // A "weak" preset doesn't set any tags. (e.g. "Address")
-               var weakPreset = _activePresets.length === 1 &&
-                   Object.keys(_activePresets[0].addTags || {}).length === 0;
-               // Don't replace a weak preset with a fallback preset (e.g. "Point")
-               if (weakPreset && matches.length === 1 && matches[0].isFallback()) return;
-
-               entityEditor.presets(matches);
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.ui().editMenu().on('toggled.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
            }
+         }
 
-           entityEditor.presets = function(val) {
-               if (!arguments.length) return _activePresets;
-
-               // don't reload the same preset
-               if (!utilArrayIdentical(val, _activePresets)) {
-                   _activePresets = val;
-               }
-               return entityEditor;
-           };
+         function multiDelete() {
+           if (!_washingtonSegmentID || !context.hasEntity(_washingtonSegmentID) || !context.hasEntity(washingtonStreetID) || !context.hasEntity(twelfthAvenueID) || !context.hasEntity(eleventhAvenueEndID)) {
+             return continueTo(rightClickIntersection);
+           }
 
-           return utilRebind(entityEditor, dispatch$1, 'on');
-       }
+           var node = selectMenuItem(context, 'delete').node();
+           if (!node) return continueTo(multiRightClick);
+           reveal('.edit-menu', helpHtml('intro.lines.multi_delete'), {
+             padding: 50
+           });
+           context.map().on('move.intro drawn.intro', function () {
+             reveal('.edit-menu', helpHtml('intro.lines.multi_delete'), {
+               duration: 0,
+               padding: 50
+             });
+           });
+           context.on('exit.intro', function () {
+             if (context.hasEntity(_washingtonSegmentID) || context.hasEntity(twelfthAvenueID)) {
+               return continueTo(multiSelect); // left select mode but roads still exist
+             }
+           });
+           context.history().on('change.intro', function () {
+             if (context.hasEntity(_washingtonSegmentID) || context.hasEntity(twelfthAvenueID)) {
+               continueTo(retryDelete); // changed something but roads still exist
+             } else {
+               continueTo(play);
+             }
+           });
 
-       function uiPresetList(context) {
-           var dispatch$1 = dispatch('cancel', 'choose');
-           var _entityIDs;
-           var _currentPresets;
-           var _autofocus = false;
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.on('exit.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
+           }
+         }
 
+         function retryDelete() {
+           context.enter(modeBrowse(context));
+           var padding = 200 * Math.pow(2, context.map().zoom() - 18);
+           var box = pad(twelfthAvenue, padding, context);
+           reveal(box, helpHtml('intro.lines.retry_delete'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: function buttonCallback() {
+               continueTo(multiSelect);
+             }
+           });
 
-           function presetList(selection) {
-               if (!_entityIDs) return;
+           function continueTo(nextStep) {
+             nextStep();
+           }
+         }
 
-               var presets = _mainPresetIndex.matchAllGeometry(entityGeometries());
+         function play() {
+           dispatch$1.call('done');
+           reveal('.ideditor', helpHtml('intro.lines.play', {
+             next: _t('intro.buildings.title')
+           }), {
+             tooltipBox: '.intro-nav-wrap .chapter-building',
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: function buttonCallback() {
+               reveal('.ideditor');
+             }
+           });
+         }
 
-               selection.html('');
+         chapter.enter = function () {
+           addLine();
+         };
 
-               var messagewrap = selection
-                   .append('div')
-                   .attr('class', 'header fillL');
-
-               var message = messagewrap
-                   .append('h3')
-                   .text(_t('inspector.choose'));
-
-               messagewrap
-                   .append('button')
-                   .attr('class', 'preset-choose')
-                   .on('click', function() { dispatch$1.call('cancel', this); })
-                   .call(svgIcon((_mainLocalizer.textDirection() === 'rtl') ? '#iD-icon-backward' : '#iD-icon-forward'));
-
-               function initialKeydown() {
-                   // hack to let delete shortcut work when search is autofocused
-                   if (search.property('value').length === 0 &&
-                       (event.keyCode === utilKeybinding.keyCodes['⌫'] ||
-                        event.keyCode === utilKeybinding.keyCodes['⌦'])) {
-                       event.preventDefault();
-                       event.stopPropagation();
-                       operationDelete(context, _entityIDs)();
-
-                   // hack to let undo work when search is autofocused
-                   } else if (search.property('value').length === 0 &&
-                       (event.ctrlKey || event.metaKey) &&
-                       event.keyCode === utilKeybinding.keyCodes.z) {
-                       event.preventDefault();
-                       event.stopPropagation();
-                       context.undo();
-                   } else if (!event.ctrlKey && !event.metaKey) {
-                       // don't check for delete/undo hack on future keydown events
-                       select(this).on('keydown', keydown);
-                       keydown.call(this);
-                   }
-               }
+         chapter.exit = function () {
+           timeouts.forEach(window.clearTimeout);
+           select(window).on('pointerdown.intro mousedown.intro', null, true);
+           context.on('enter.intro exit.intro', null);
+           context.map().on('move.intro drawn.intro', null);
+           context.history().on('change.intro', null);
+           context.container().select('.inspector-wrap').on('wheel.intro', null);
+           context.container().select('.preset-list-button').on('click.intro', null);
+         };
 
-               function keydown() {
-                   // down arrow
-                   if (event.keyCode === utilKeybinding.keyCodes['↓'] &&
-                       // if insertion point is at the end of the string
-                       search.node().selectionStart === search.property('value').length) {
-                       event.preventDefault();
-                       event.stopPropagation();
-                       // move focus to the first item in the preset list
-                       var buttons = list.selectAll('.preset-list-button');
-                       if (!buttons.empty()) buttons.nodes()[0].focus();
-                   }
-               }
+         chapter.restart = function () {
+           chapter.exit();
+           chapter.enter();
+         };
 
-               function keypress() {
-                   // enter
-                   var value = search.property('value');
-                   if (event.keyCode === 13 && value.length) {
-                       list.selectAll('.preset-list-item:first-child')
-                           .each(function(d) { d.choose.call(this); });
-                   }
-               }
+         return utilRebind(chapter, dispatch$1, 'on');
+       }
 
-               function inputevent() {
-                   var value = search.property('value');
-                   list.classed('filtered', value.length);
-                   var extent = combinedEntityExtent();
-                   var results, messageText;
-                   if (value.length && extent) {
-                       var center = extent.center();
-                       var countryCode = iso1A2Code(center);
+       function uiIntroBuilding(context, reveal) {
+         var dispatch$1 = dispatch('done');
+         var house = [-85.62815, 41.95638];
+         var tank = [-85.62732, 41.95347];
+         var buildingCatetory = _mainPresetIndex.item('category-building');
+         var housePreset = _mainPresetIndex.item('building/house');
+         var tankPreset = _mainPresetIndex.item('man_made/storage_tank');
+         var timeouts = [];
+         var _houseID = null;
+         var _tankID = null;
+         var chapter = {
+           title: 'intro.buildings.title'
+         };
 
-                       results = presets.search(value, entityGeometries()[0], countryCode && countryCode.toLowerCase());
-                       messageText = _t('inspector.results', {
-                           n: results.collection.length,
-                           search: value
-                       });
-                   } else {
-                       results = _mainPresetIndex.defaults(entityGeometries()[0], 36, !context.inIntro());
-                       messageText = _t('inspector.choose');
-                   }
-                   list.call(drawList, results);
-                   message.text(messageText);
-               }
+         function timeout(f, t) {
+           timeouts.push(window.setTimeout(f, t));
+         }
 
-               var searchWrap = selection
-                   .append('div')
-                   .attr('class', 'search-header');
+         function eventCancel(d3_event) {
+           d3_event.stopPropagation();
+           d3_event.preventDefault();
+         }
 
-               var search = searchWrap
-                   .append('input')
-                   .attr('class', 'preset-search-input')
-                   .attr('placeholder', _t('inspector.search'))
-                   .attr('type', 'search')
-                   .call(utilNoAuto)
-                   .on('keydown', initialKeydown)
-                   .on('keypress', keypress)
-                   .on('input', inputevent);
+         function revealHouse(center, text, options) {
+           var padding = 160 * Math.pow(2, context.map().zoom() - 20);
+           var box = pad(center, padding, context);
+           reveal(box, text, options);
+         }
 
-               searchWrap
-                   .call(svgIcon('#iD-icon-search', 'pre-text'));
+         function revealTank(center, text, options) {
+           var padding = 190 * Math.pow(2, context.map().zoom() - 19.5);
+           var box = pad(center, padding, context);
+           reveal(box, text, options);
+         }
 
-               if (_autofocus) {
-                   search.node().focus();
-               }
+         function addHouse() {
+           context.enter(modeBrowse(context));
+           context.history().reset('initial');
+           _houseID = null;
+           var msec = transitionTime(house, context.map().center());
 
-               var listWrap = selection
-                   .append('div')
-                   .attr('class', 'inspector-body');
+           if (msec) {
+             reveal(null, null, {
+               duration: 0
+             });
+           }
 
-               var list = listWrap
-                   .append('div')
-                   .attr('class', 'preset-list')
-                   .call(drawList, _mainPresetIndex.defaults(entityGeometries()[0], 36, !context.inIntro()));
+           context.map().centerZoomEase(house, 19, msec);
+           timeout(function () {
+             var tooltip = reveal('button.add-area', helpHtml('intro.buildings.add_building'));
+             tooltip.selectAll('.popover-inner').insert('svg', 'span').attr('class', 'tooltip-illustration').append('use').attr('xlink:href', '#iD-graphic-buildings');
+             context.on('enter.intro', function (mode) {
+               if (mode.id !== 'add-area') return;
+               continueTo(startHouse);
+             });
+           }, msec + 100);
 
-               context.features().on('change.preset-list', updateForFeatureHiddenState);
+           function continueTo(nextStep) {
+             context.on('enter.intro', null);
+             nextStep();
            }
+         }
 
+         function startHouse() {
+           if (context.mode().id !== 'add-area') {
+             return continueTo(addHouse);
+           }
 
-           function drawList(list, presets) {
-               presets = presets.matchAllGeometry(entityGeometries());
-               var collection = presets.collection.reduce(function(collection, preset) {
-                   if (!preset) return collection;
+           _houseID = null;
+           context.map().zoomEase(20, 500);
+           timeout(function () {
+             var startString = helpHtml('intro.buildings.start_building') + helpHtml('intro.buildings.building_corner_' + (context.lastPointerType() === 'mouse' ? 'click' : 'tap'));
+             revealHouse(house, startString);
+             context.map().on('move.intro drawn.intro', function () {
+               revealHouse(house, startString, {
+                 duration: 0
+               });
+             });
+             context.on('enter.intro', function (mode) {
+               if (mode.id !== 'draw-area') return chapter.restart();
+               continueTo(continueHouse);
+             });
+           }, 550); // after easing
 
-                   if (preset.members) {
-                       if (preset.members.collection.filter(function(preset) {
-                           return preset.addable();
-                       }).length > 1) {
-                           collection.push(CategoryItem(preset));
-                       }
-                   } else if (preset.addable()) {
-                       collection.push(PresetItem(preset));
-                   }
-                   return collection;
-               }, []);
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.on('enter.intro', null);
+             nextStep();
+           }
+         }
 
-               var items = list.selectAll('.preset-list-item')
-                   .data(collection, function(d) { return d.preset.id; });
+         function continueHouse() {
+           if (context.mode().id !== 'draw-area') {
+             return continueTo(addHouse);
+           }
 
-               items.order();
+           _houseID = null;
+           var continueString = helpHtml('intro.buildings.continue_building') + '{br}' + helpHtml('intro.areas.finish_area_' + (context.lastPointerType() === 'mouse' ? 'click' : 'tap')) + helpHtml('intro.buildings.finish_building');
+           revealHouse(house, continueString);
+           context.map().on('move.intro drawn.intro', function () {
+             revealHouse(house, continueString, {
+               duration: 0
+             });
+           });
+           context.on('enter.intro', function (mode) {
+             if (mode.id === 'draw-area') {
+               return;
+             } else if (mode.id === 'select') {
+               var graph = context.graph();
+               var way = context.entity(context.selectedIDs()[0]);
+               var nodes = graph.childNodes(way);
+               var points = utilArrayUniq(nodes).map(function (n) {
+                 return context.projection(n.loc);
+               });
 
-               items.exit()
-                   .remove();
+               if (isMostlySquare(points)) {
+                 _houseID = way.id;
+                 return continueTo(chooseCategoryBuilding);
+               } else {
+                 return continueTo(retryHouse);
+               }
+             } else {
+               return chapter.restart();
+             }
+           });
 
-               items.enter()
-                   .append('div')
-                   .attr('class', function(item) { return 'preset-list-item preset-' + item.preset.id.replace('/', '-'); })
-                   .classed('current', function(item) { return _currentPresets.indexOf(item.preset) !== -1; })
-                   .each(function(item) { select(this).call(item); })
-                   .style('opacity', 0)
-                   .transition()
-                   .style('opacity', 1);
-
-               updateForFeatureHiddenState();
-           }
-
-           function itemKeydown(){
-               // the actively focused item
-               var item = select(this.closest('.preset-list-item'));
-               var parentItem = select(item.node().parentNode.closest('.preset-list-item'));
-
-               // arrow down, move focus to the next, lower item
-               if (event.keyCode === utilKeybinding.keyCodes['↓']) {
-                   event.preventDefault();
-                   event.stopPropagation();
-                   // the next item in the list at the same level
-                   var nextItem = select(item.node().nextElementSibling);
-                   // if there is no next item in this list
-                   if (nextItem.empty()) {
-                       // if there is a parent item
-                       if (!parentItem.empty()) {
-                           // the item is the last item of a sublist,
-                           // select the next item at the parent level
-                           nextItem = select(parentItem.node().nextElementSibling);
-                       }
-                   // if the focused item is expanded
-                   } else if (select(this).classed('expanded')) {
-                       // select the first subitem instead
-                       nextItem = item.select('.subgrid .preset-list-item:first-child');
-                   }
-                   if (!nextItem.empty()) {
-                       // focus on the next item
-                       nextItem.select('.preset-list-button').node().focus();
-                   }
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.on('enter.intro', null);
+             nextStep();
+           }
+         }
 
-               // arrow up, move focus to the previous, higher item
-               } else if (event.keyCode === utilKeybinding.keyCodes['↑']) {
-                   event.preventDefault();
-                   event.stopPropagation();
-                   // the previous item in the list at the same level
-                   var previousItem = select(item.node().previousElementSibling);
-
-                   // if there is no previous item in this list
-                   if (previousItem.empty()) {
-                       // if there is a parent item
-                       if (!parentItem.empty()) {
-                           // the item is the first subitem of a sublist select the parent item
-                           previousItem = parentItem;
-                       }
-                   // if the previous item is expanded
-                   } else if (previousItem.select('.preset-list-button').classed('expanded')) {
-                       // select the last subitem of the sublist of the previous item
-                       previousItem = previousItem.select('.subgrid .preset-list-item:last-child');
-                   }
+         function retryHouse() {
+           var onClick = function onClick() {
+             continueTo(addHouse);
+           };
 
-                   if (!previousItem.empty()) {
-                       // focus on the previous item
-                       previousItem.select('.preset-list-button').node().focus();
-                   } else {
-                       // the focus is at the top of the list, move focus back to the search field
-                       var search = select(this.closest('.preset-list-pane')).select('.preset-search-input');
-                       search.node().focus();
-                   }
+           revealHouse(house, helpHtml('intro.buildings.retry_building'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: onClick
+           });
+           context.map().on('move.intro drawn.intro', function () {
+             revealHouse(house, helpHtml('intro.buildings.retry_building'), {
+               duration: 0,
+               buttonText: _t.html('intro.ok'),
+               buttonCallback: onClick
+             });
+           });
 
-               // arrow left, move focus to the parent item if there is one
-               } else if (event.keyCode === utilKeybinding.keyCodes[(_mainLocalizer.textDirection() === 'rtl') ? '→' : '←']) {
-                   event.preventDefault();
-                   event.stopPropagation();
-                   // if there is a parent item, focus on the parent item
-                   if (!parentItem.empty()) {
-                       parentItem.select('.preset-list-button').node().focus();
-                   }
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             nextStep();
+           }
+         }
 
-               // arrow right, choose this item
-               } else if (event.keyCode === utilKeybinding.keyCodes[(_mainLocalizer.textDirection() === 'rtl') ? '←' : '→']) {
-                   event.preventDefault();
-                   event.stopPropagation();
-                   item.datum().choose.call(select(this).node());
-               }
+         function chooseCategoryBuilding() {
+           if (!_houseID || !context.hasEntity(_houseID)) {
+             return addHouse();
            }
 
+           var ids = context.selectedIDs();
 
-           function CategoryItem(preset) {
-               var box, sublist, shown = false;
+           if (context.mode().id !== 'select' || !ids.length || ids[0] !== _houseID) {
+             context.enter(modeSelect(context, [_houseID]));
+           } // disallow scrolling
 
-               function item(selection) {
-                   var wrap = selection.append('div')
-                       .attr('class', 'preset-list-button-wrap category');
 
-                   function click() {
-                       var isExpanded = select(this).classed('expanded');
-                       var iconName = isExpanded ?
-                           (_mainLocalizer.textDirection() === 'rtl' ? '#iD-icon-backward' : '#iD-icon-forward') : '#iD-icon-down';
-                       select(this)
-                           .classed('expanded', !isExpanded);
-                       select(this).selectAll('div.label-inner svg.icon use')
-                           .attr('href', iconName);
-                       item.choose();
-                   }
+           context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+           timeout(function () {
+             // reset pane, in case user somehow happened to change it..
+             context.container().select('.inspector-wrap .panewrap').style('right', '-100%');
+             var button = context.container().select('.preset-category-building .preset-list-button');
+             reveal(button.node(), helpHtml('intro.buildings.choose_category_building', {
+               category: buildingCatetory.name()
+             }));
+             button.on('click.intro', function () {
+               button.on('click.intro', null);
+               continueTo(choosePresetHouse);
+             });
+           }, 400); // after preset list pane visible..
 
-                   var geometries = entityGeometries();
+           context.on('enter.intro', function (mode) {
+             if (!_houseID || !context.hasEntity(_houseID)) {
+               return continueTo(addHouse);
+             }
 
-                   var button = wrap
-                       .append('button')
-                       .attr('class', 'preset-list-button')
-                       .classed('expanded', false)
-                       .call(uiPresetIcon()
-                           .geometry(geometries.length === 1 && geometries[0])
-                           .preset(preset))
-                       .on('click', click)
-                       .on('keydown', function() {
-                           // right arrow, expand the focused item
-                           if (event.keyCode === utilKeybinding.keyCodes[(_mainLocalizer.textDirection() === 'rtl') ? '←' : '→']) {
-                               event.preventDefault();
-                               event.stopPropagation();
-                               // if the item isn't expanded
-                               if (!select(this).classed('expanded')) {
-                                   // toggle expansion (expand the item)
-                                   click.call(this);
-                               }
-                           // left arrow, collapse the focused item
-                           } else if (event.keyCode === utilKeybinding.keyCodes[(_mainLocalizer.textDirection() === 'rtl') ? '→' : '←']) {
-                               event.preventDefault();
-                               event.stopPropagation();
-                               // if the item is expanded
-                               if (select(this).classed('expanded')) {
-                                   // toggle expansion (collapse the item)
-                                   click.call(this);
-                               }
-                           } else {
-                               itemKeydown.call(this);
-                           }
-                       });
+             var ids = context.selectedIDs();
 
-                   var label = button
-                       .append('div')
-                       .attr('class', 'label')
-                       .append('div')
-                       .attr('class', 'label-inner');
+             if (mode.id !== 'select' || !ids.length || ids[0] !== _houseID) {
+               return continueTo(chooseCategoryBuilding);
+             }
+           });
+
+           function continueTo(nextStep) {
+             context.container().select('.inspector-wrap').on('wheel.intro', null);
+             context.container().select('.preset-list-button').on('click.intro', null);
+             context.on('enter.intro', null);
+             nextStep();
+           }
+         }
+
+         function choosePresetHouse() {
+           if (!_houseID || !context.hasEntity(_houseID)) {
+             return addHouse();
+           }
 
-                   label
-                       .append('div')
-                       .attr('class', 'namepart')
-                       .call(svgIcon((_mainLocalizer.textDirection() === 'rtl' ? '#iD-icon-backward' : '#iD-icon-forward'), 'inline'))
-                       .append('span')
-                       .html(function() { return preset.name() + '&hellip;'; });
+           var ids = context.selectedIDs();
 
-                   box = selection.append('div')
-                       .attr('class', 'subgrid')
-                       .style('max-height', '0px')
-                       .style('opacity', 0);
+           if (context.mode().id !== 'select' || !ids.length || ids[0] !== _houseID) {
+             context.enter(modeSelect(context, [_houseID]));
+           } // disallow scrolling
 
-                   box.append('div')
-                       .attr('class', 'arrow');
 
-                   sublist = box.append('div')
-                       .attr('class', 'preset-list fillL3');
-               }
+           context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+           timeout(function () {
+             // reset pane, in case user somehow happened to change it..
+             context.container().select('.inspector-wrap .panewrap').style('right', '-100%');
+             var button = context.container().select('.preset-building-house .preset-list-button');
+             reveal(button.node(), helpHtml('intro.buildings.choose_preset_house', {
+               preset: housePreset.name()
+             }), {
+               duration: 300
+             });
+             button.on('click.intro', function () {
+               button.on('click.intro', null);
+               continueTo(closeEditorHouse);
+             });
+           }, 400); // after preset list pane visible..
 
+           context.on('enter.intro', function (mode) {
+             if (!_houseID || !context.hasEntity(_houseID)) {
+               return continueTo(addHouse);
+             }
 
-               item.choose = function() {
-                   if (!box || !sublist) return;
+             var ids = context.selectedIDs();
 
-                   if (shown) {
-                       shown = false;
-                       box.transition()
-                           .duration(200)
-                           .style('opacity', '0')
-                           .style('max-height', '0px')
-                           .style('padding-bottom', '0px');
-                   } else {
-                       shown = true;
-                       var members = preset.members.matchAllGeometry(entityGeometries());
-                       sublist.call(drawList, members);
-                       box.transition()
-                           .duration(200)
-                           .style('opacity', '1')
-                           .style('max-height', 200 + members.collection.length * 190 + 'px')
-                           .style('padding-bottom', '10px');
-                   }
-               };
+             if (mode.id !== 'select' || !ids.length || ids[0] !== _houseID) {
+               return continueTo(chooseCategoryBuilding);
+             }
+           });
 
-               item.preset = preset;
-               return item;
+           function continueTo(nextStep) {
+             context.container().select('.inspector-wrap').on('wheel.intro', null);
+             context.container().select('.preset-list-button').on('click.intro', null);
+             context.on('enter.intro', null);
+             nextStep();
            }
+         }
 
+         function closeEditorHouse() {
+           if (!_houseID || !context.hasEntity(_houseID)) {
+             return addHouse();
+           }
 
-           function PresetItem(preset) {
-               function item(selection) {
-                   var wrap = selection.append('div')
-                       .attr('class', 'preset-list-button-wrap');
-
-                   var geometries = entityGeometries();
+           var ids = context.selectedIDs();
 
-                   var button = wrap.append('button')
-                       .attr('class', 'preset-list-button')
-                       .call(uiPresetIcon()
-                           .geometry(geometries.length === 1 && geometries[0])
-                           .preset(preset))
-                       .on('click', item.choose)
-                       .on('keydown', itemKeydown);
+           if (context.mode().id !== 'select' || !ids.length || ids[0] !== _houseID) {
+             context.enter(modeSelect(context, [_houseID]));
+           }
 
-                   var label = button
-                       .append('div')
-                       .attr('class', 'label')
-                       .append('div')
-                       .attr('class', 'label-inner');
+           context.history().checkpoint('hasHouse');
+           context.on('exit.intro', function () {
+             continueTo(rightClickHouse);
+           });
+           timeout(function () {
+             reveal('.entity-editor-pane', helpHtml('intro.buildings.close', {
+               button: icon('#iD-icon-close', 'inline')
+             }));
+           }, 500);
 
-                   // NOTE: split/join on en-dash, not a hypen (to avoid conflict with fr - nl names in Brussels etc)
-                   label.selectAll('.namepart')
-                       .data(preset.name().split(' – '))
-                       .enter()
-                       .append('div')
-                       .attr('class', 'namepart')
-                       .text(function(d) { return d; });
+           function continueTo(nextStep) {
+             context.on('exit.intro', null);
+             nextStep();
+           }
+         }
 
-                   wrap.call(item.reference.button);
-                   selection.call(item.reference.body);
-               }
+         function rightClickHouse() {
+           if (!_houseID) return chapter.restart();
+           context.enter(modeBrowse(context));
+           context.history().reset('hasHouse');
+           var zoom = context.map().zoom();
 
-               item.choose = function() {
-                   if (select(this).classed('disabled')) return;
-                   if (!context.inIntro()) {
-                       _mainPresetIndex.setMostRecent(preset, entityGeometries()[0]);
-                   }
-                   context.perform(
-                       function(graph) {
-                           for (var i in _entityIDs) {
-                               var entityID = _entityIDs[i];
-                               var oldPreset = _mainPresetIndex.match(graph.entity(entityID), graph);
-                               graph = actionChangePreset(entityID, oldPreset, preset)(graph);
-                           }
-                           return graph;
-                       },
-                       _t('operations.change_tags.annotation')
-                   );
+           if (zoom < 20) {
+             zoom = 20;
+           }
 
-                   context.validator().validate();  // rerun validation
-                   dispatch$1.call('choose', this, preset);
-               };
+           context.map().centerZoomEase(house, zoom, 500);
+           context.on('enter.intro', function (mode) {
+             if (mode.id !== 'select') return;
+             var ids = context.selectedIDs();
+             if (ids.length !== 1 || ids[0] !== _houseID) return;
+             timeout(function () {
+               var node = selectMenuItem(context, 'orthogonalize').node();
+               if (!node) return;
+               continueTo(clickSquare);
+             }, 50); // after menu visible
+           });
+           context.map().on('move.intro drawn.intro', function () {
+             var rightclickString = helpHtml('intro.buildings.' + (context.lastPointerType() === 'mouse' ? 'rightclick_building' : 'edit_menu_building_touch'));
+             revealHouse(house, rightclickString, {
+               duration: 0
+             });
+           });
+           context.history().on('change.intro', function () {
+             continueTo(rightClickHouse);
+           });
 
-               item.help = function() {
-                   event.stopPropagation();
-                   item.reference.toggle();
-               };
+           function continueTo(nextStep) {
+             context.on('enter.intro', null);
+             context.map().on('move.intro drawn.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
+           }
+         }
 
-               item.preset = preset;
-               item.reference = uiTagReference(preset.reference(entityGeometries()[0]));
+         function clickSquare() {
+           if (!_houseID) return chapter.restart();
+           var entity = context.hasEntity(_houseID);
+           if (!entity) return continueTo(rightClickHouse);
+           var node = selectMenuItem(context, 'orthogonalize').node();
 
-               return item;
+           if (!node) {
+             return continueTo(rightClickHouse);
            }
 
+           var wasChanged = false;
+           reveal('.edit-menu', helpHtml('intro.buildings.square_building'), {
+             padding: 50
+           });
+           context.on('enter.intro', function (mode) {
+             if (mode.id === 'browse') {
+               continueTo(rightClickHouse);
+             } else if (mode.id === 'move' || mode.id === 'rotate') {
+               continueTo(retryClickSquare);
+             }
+           });
+           context.map().on('move.intro', function () {
+             var node = selectMenuItem(context, 'orthogonalize').node();
 
-           function updateForFeatureHiddenState() {
-               if (!_entityIDs.every(context.hasEntity)) return;
+             if (!wasChanged && !node) {
+               return continueTo(rightClickHouse);
+             }
 
-               var geometries = entityGeometries();
-               var button = context.container().selectAll('.preset-list .preset-list-button');
+             reveal('.edit-menu', helpHtml('intro.buildings.square_building'), {
+               duration: 0,
+               padding: 50
+             });
+           });
+           context.history().on('change.intro', function () {
+             wasChanged = true;
+             context.history().on('change.intro', null); // Something changed.  Wait for transition to complete and check undo annotation.
 
-               // remove existing tooltips
-               button.call(uiTooltip().destroyAny);
+             timeout(function () {
+               if (context.history().undoAnnotation() === _t('operations.orthogonalize.annotation.feature', {
+                 n: 1
+               })) {
+                 continueTo(doneSquare);
+               } else {
+                 continueTo(retryClickSquare);
+               }
+             }, 500); // after transitioned actions
+           });
 
-               button.each(function(item, index) {
-                   var hiddenPresetFeaturesId;
-                   for (var i in geometries) {
-                       hiddenPresetFeaturesId = context.features().isHiddenPreset(item.preset, geometries[i]);
-                       if (hiddenPresetFeaturesId) break;
-                   }
-                   var isHiddenPreset = !context.inIntro() &&
-                       !!hiddenPresetFeaturesId &&
-                       (_currentPresets.length !== 1 || item.preset !== _currentPresets[0]);
-
-                   select(this)
-                       .classed('disabled', isHiddenPreset);
-
-                   if (isHiddenPreset) {
-                       var isAutoHidden = context.features().autoHidden(hiddenPresetFeaturesId);
-                       var tooltipIdSuffix = isAutoHidden ? 'zoom' : 'manual';
-                       var tooltipObj = { features: _t('feature.' + hiddenPresetFeaturesId + '.description') };
-                       select(this).call(uiTooltip()
-                           .title(_t('inspector.hidden_preset.' + tooltipIdSuffix, tooltipObj))
-                           .placement(index < 2 ? 'bottom' : 'top')
-                       );
-                   }
-               });
+           function continueTo(nextStep) {
+             context.on('enter.intro', null);
+             context.map().on('move.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
            }
+         }
 
-           presetList.autofocus = function(val) {
-               if (!arguments.length) return _autofocus;
-               _autofocus = val;
-               return presetList;
-           };
+         function retryClickSquare() {
+           context.enter(modeBrowse(context));
+           revealHouse(house, helpHtml('intro.buildings.retry_square'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: function buttonCallback() {
+               continueTo(rightClickHouse);
+             }
+           });
 
-           presetList.entityIDs = function(val) {
-               if (!arguments.length) return _entityIDs;
-               _entityIDs = val;
-               if (_entityIDs && _entityIDs.length) {
-                   var presets = _entityIDs.map(function(entityID) {
-                       return _mainPresetIndex.match(context.entity(entityID), context.graph());
-                   });
-                   presetList.presets(presets);
-               }
-               return presetList;
-           };
+           function continueTo(nextStep) {
+             nextStep();
+           }
+         }
 
-           presetList.presets = function(val) {
-               if (!arguments.length) return _currentPresets;
-               _currentPresets = val;
-               return presetList;
-           };
+         function doneSquare() {
+           context.history().checkpoint('doneSquare');
+           revealHouse(house, helpHtml('intro.buildings.done_square'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: function buttonCallback() {
+               continueTo(addTank);
+             }
+           });
 
-           function entityGeometries() {
+           function continueTo(nextStep) {
+             nextStep();
+           }
+         }
 
-               var counts = {};
+         function addTank() {
+           context.enter(modeBrowse(context));
+           context.history().reset('doneSquare');
+           _tankID = null;
+           var msec = transitionTime(tank, context.map().center());
 
-               for (var i in _entityIDs) {
-                   var entityID = _entityIDs[i];
-                   var entity = context.entity(entityID);
-                   var geometry = entity.geometry(context.graph());
+           if (msec) {
+             reveal(null, null, {
+               duration: 0
+             });
+           }
 
-                   // Treat entities on addr:interpolation lines as points, not vertices (#3241)
-                   if (geometry === 'vertex' && entity.isOnAddressLine(context.graph())) {
-                       geometry = 'point';
-                   }
+           context.map().centerZoomEase(tank, 19.5, msec);
+           timeout(function () {
+             reveal('button.add-area', helpHtml('intro.buildings.add_tank'));
+             context.on('enter.intro', function (mode) {
+               if (mode.id !== 'add-area') return;
+               continueTo(startTank);
+             });
+           }, msec + 100);
 
-                   if (!counts[geometry]) counts[geometry] = 0;
-                   counts[geometry] += 1;
-               }
+           function continueTo(nextStep) {
+             context.on('enter.intro', null);
+             nextStep();
+           }
+         }
+
+         function startTank() {
+           if (context.mode().id !== 'add-area') {
+             return continueTo(addTank);
+           }
 
-               return Object.keys(counts).sort(function(geom1, geom2) {
-                   return counts[geom2] - counts[geom1];
+           _tankID = null;
+           timeout(function () {
+             var startString = helpHtml('intro.buildings.start_tank') + helpHtml('intro.buildings.tank_edge_' + (context.lastPointerType() === 'mouse' ? 'click' : 'tap'));
+             revealTank(tank, startString);
+             context.map().on('move.intro drawn.intro', function () {
+               revealTank(tank, startString, {
+                 duration: 0
                });
+             });
+             context.on('enter.intro', function (mode) {
+               if (mode.id !== 'draw-area') return chapter.restart();
+               continueTo(continueTank);
+             });
+           }, 550); // after easing
+
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.on('enter.intro', null);
+             nextStep();
            }
+         }
 
-           function combinedEntityExtent() {
-               return _entityIDs.reduce(function(extent, entityID) {
-                   var entity = context.graph().entity(entityID);
-                   return extent.extend(entity.extent(context.graph()));
-               }, geoExtent());
+         function continueTank() {
+           if (context.mode().id !== 'draw-area') {
+             return continueTo(addTank);
            }
 
-           return utilRebind(presetList, dispatch$1, 'on');
-       }
+           _tankID = null;
+           var continueString = helpHtml('intro.buildings.continue_tank') + '{br}' + helpHtml('intro.areas.finish_area_' + (context.lastPointerType() === 'mouse' ? 'click' : 'tap')) + helpHtml('intro.buildings.finish_tank');
+           revealTank(tank, continueString);
+           context.map().on('move.intro drawn.intro', function () {
+             revealTank(tank, continueString, {
+               duration: 0
+             });
+           });
+           context.on('enter.intro', function (mode) {
+             if (mode.id === 'draw-area') {
+               return;
+             } else if (mode.id === 'select') {
+               _tankID = context.selectedIDs()[0];
+               return continueTo(searchPresetTank);
+             } else {
+               return continueTo(addTank);
+             }
+           });
 
-       function uiInspector(context) {
-           var presetList = uiPresetList(context);
-           var entityEditor = uiEntityEditor(context);
-           var wrap = select(null),
-               presetPane = select(null),
-               editorPane = select(null);
-           var _state = 'select';
-           var _entityIDs;
-           var _newFeature = false;
-
-
-           function inspector(selection) {
-               presetList
-                   .entityIDs(_entityIDs)
-                   .autofocus(_newFeature)
-                   .on('choose', inspector.setPreset)
-                   .on('cancel', function() {
-                       wrap.transition()
-                           .styleTween('right', function() { return interpolate('-100%', '0%'); });
-                       editorPane.call(entityEditor);
-                   });
+           function continueTo(nextStep) {
+             context.map().on('move.intro drawn.intro', null);
+             context.on('enter.intro', null);
+             nextStep();
+           }
+         }
 
-               entityEditor
-                   .state(_state)
-                   .entityIDs(_entityIDs)
-                   .on('choose', inspector.showList);
+         function searchPresetTank() {
+           if (!_tankID || !context.hasEntity(_tankID)) {
+             return addTank();
+           }
 
-               wrap = selection.selectAll('.panewrap')
-                   .data([0]);
+           var ids = context.selectedIDs();
 
-               var enter = wrap.enter()
-                   .append('div')
-                   .attr('class', 'panewrap');
+           if (context.mode().id !== 'select' || !ids.length || ids[0] !== _tankID) {
+             context.enter(modeSelect(context, [_tankID]));
+           } // disallow scrolling
 
-               enter
-                   .append('div')
-                   .attr('class', 'preset-list-pane pane');
 
-               enter
-                   .append('div')
-                   .attr('class', 'entity-editor-pane pane');
+           context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+           timeout(function () {
+             // reset pane, in case user somehow happened to change it..
+             context.container().select('.inspector-wrap .panewrap').style('right', '-100%');
+             context.container().select('.preset-search-input').on('keydown.intro', null).on('keyup.intro', checkPresetSearch);
+             reveal('.preset-search-input', helpHtml('intro.buildings.search_tank', {
+               preset: tankPreset.name()
+             }));
+           }, 400); // after preset list pane visible..
 
-               wrap = wrap.merge(enter);
-               presetPane = wrap.selectAll('.preset-list-pane');
-               editorPane = wrap.selectAll('.entity-editor-pane');
+           context.on('enter.intro', function (mode) {
+             if (!_tankID || !context.hasEntity(_tankID)) {
+               return continueTo(addTank);
+             }
 
-               function shouldDefaultToPresetList() {
-                   // always show the inspector on hover
-                   if (_state !== 'select') return false;
+             var ids = context.selectedIDs();
 
-                   // can only change preset on single selection
-                   if (_entityIDs.length !== 1) return false;
+             if (mode.id !== 'select' || !ids.length || ids[0] !== _tankID) {
+               // keep the user's area selected..
+               context.enter(modeSelect(context, [_tankID])); // reset pane, in case user somehow happened to change it..
 
-                   var entityID = _entityIDs[0];
-                   var entity = context.hasEntity(entityID);
-                   if (!entity) return false;
+               context.container().select('.inspector-wrap .panewrap').style('right', '-100%'); // disallow scrolling
 
-                   // default to inspector if there are already tags
-                   if (entity.hasNonGeometryTags()) return false;
+               context.container().select('.inspector-wrap').on('wheel.intro', eventCancel);
+               context.container().select('.preset-search-input').on('keydown.intro', null).on('keyup.intro', checkPresetSearch);
+               reveal('.preset-search-input', helpHtml('intro.buildings.search_tank', {
+                 preset: tankPreset.name()
+               }));
+               context.history().on('change.intro', null);
+             }
+           });
 
-                   // prompt to select preset if feature is new and untagged
-                   if (_newFeature) return true;
+           function checkPresetSearch() {
+             var first = context.container().select('.preset-list-item:first-child');
 
-                   // all existing features except vertices should default to inspector
-                   if (entity.geometry(context.graph()) !== 'vertex') return false;
+             if (first.classed('preset-man_made-storage_tank')) {
+               reveal(first.select('.preset-list-button').node(), helpHtml('intro.buildings.choose_tank', {
+                 preset: tankPreset.name()
+               }), {
+                 duration: 300
+               });
+               context.container().select('.preset-search-input').on('keydown.intro', eventCancel, true).on('keyup.intro', null);
+               context.history().on('change.intro', function () {
+                 continueTo(closeEditorTank);
+               });
+             }
+           }
 
-                   // show vertex relations if any
-                   if (context.graph().parentRelations(entity).length) return false;
+           function continueTo(nextStep) {
+             context.container().select('.inspector-wrap').on('wheel.intro', null);
+             context.on('enter.intro', null);
+             context.history().on('change.intro', null);
+             context.container().select('.preset-search-input').on('keydown.intro keyup.intro', null);
+             nextStep();
+           }
+         }
 
-                   // show vertex issues if there are any
-                   if (context.validator().getEntityIssues(entityID).length) return false;
+         function closeEditorTank() {
+           if (!_tankID || !context.hasEntity(_tankID)) {
+             return addTank();
+           }
 
-                   // show turn retriction editor for junction vertices
-                   if (entity.isHighwayIntersection(context.graph())) return false;
+           var ids = context.selectedIDs();
 
-                   // otherwise show preset list for uninteresting vertices
-                   return true;
-               }
+           if (context.mode().id !== 'select' || !ids.length || ids[0] !== _tankID) {
+             context.enter(modeSelect(context, [_tankID]));
+           }
 
-               if (shouldDefaultToPresetList()) {
-                   wrap.style('right', '-100%');
-                   presetPane.call(presetList);
-               } else {
-                   wrap.style('right', '0%');
-                   editorPane.call(entityEditor);
-               }
+           context.history().checkpoint('hasTank');
+           context.on('exit.intro', function () {
+             continueTo(rightClickTank);
+           });
+           timeout(function () {
+             reveal('.entity-editor-pane', helpHtml('intro.buildings.close', {
+               button: icon('#iD-icon-close', 'inline')
+             }));
+           }, 500);
 
-               var footer = selection.selectAll('.footer')
-                   .data([0]);
+           function continueTo(nextStep) {
+             context.on('exit.intro', null);
+             nextStep();
+           }
+         }
 
-               footer = footer.enter()
-                   .append('div')
-                   .attr('class', 'footer')
-                   .merge(footer);
+         function rightClickTank() {
+           if (!_tankID) return continueTo(addTank);
+           context.enter(modeBrowse(context));
+           context.history().reset('hasTank');
+           context.map().centerEase(tank, 500);
+           timeout(function () {
+             context.on('enter.intro', function (mode) {
+               if (mode.id !== 'select') return;
+               var ids = context.selectedIDs();
+               if (ids.length !== 1 || ids[0] !== _tankID) return;
+               timeout(function () {
+                 var node = selectMenuItem(context, 'circularize').node();
+                 if (!node) return;
+                 continueTo(clickCircle);
+               }, 50); // after menu visible
+             });
+             var rightclickString = helpHtml('intro.buildings.' + (context.lastPointerType() === 'mouse' ? 'rightclick_tank' : 'edit_menu_tank_touch'));
+             revealTank(tank, rightclickString);
+             context.map().on('move.intro drawn.intro', function () {
+               revealTank(tank, rightclickString, {
+                 duration: 0
+               });
+             });
+             context.history().on('change.intro', function () {
+               continueTo(rightClickTank);
+             });
+           }, 600);
 
-               footer
-                   .call(uiViewOnOSM(context)
-                       .what(context.hasEntity(_entityIDs.length === 1 && _entityIDs[0]))
-                   );
+           function continueTo(nextStep) {
+             context.on('enter.intro', null);
+             context.map().on('move.intro drawn.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
            }
+         }
 
-           inspector.showList = function(presets) {
-
-               wrap.transition()
-                   .styleTween('right', function() { return interpolate('0%', '-100%'); });
+         function clickCircle() {
+           if (!_tankID) return chapter.restart();
+           var entity = context.hasEntity(_tankID);
+           if (!entity) return continueTo(rightClickTank);
+           var node = selectMenuItem(context, 'circularize').node();
 
-               if (presets) {
-                   presetList.presets(presets);
-               }
+           if (!node) {
+             return continueTo(rightClickTank);
+           }
 
-               presetPane
-                   .call(presetList.autofocus(true));
-           };
+           var wasChanged = false;
+           reveal('.edit-menu', helpHtml('intro.buildings.circle_tank'), {
+             padding: 50
+           });
+           context.on('enter.intro', function (mode) {
+             if (mode.id === 'browse') {
+               continueTo(rightClickTank);
+             } else if (mode.id === 'move' || mode.id === 'rotate') {
+               continueTo(retryClickCircle);
+             }
+           });
+           context.map().on('move.intro', function () {
+             var node = selectMenuItem(context, 'circularize').node();
 
-           inspector.setPreset = function(preset) {
+             if (!wasChanged && !node) {
+               return continueTo(rightClickTank);
+             }
 
-               // upon setting multipolygon, go to the area preset list instead of the editor
-               if (preset.id === 'type/multipolygon') {
-                   presetPane
-                       .call(presetList.autofocus(true));
+             reveal('.edit-menu', helpHtml('intro.buildings.circle_tank'), {
+               duration: 0,
+               padding: 50
+             });
+           });
+           context.history().on('change.intro', function () {
+             wasChanged = true;
+             context.history().on('change.intro', null); // Something changed.  Wait for transition to complete and check undo annotation.
 
+             timeout(function () {
+               if (context.history().undoAnnotation() === _t('operations.circularize.annotation.feature', {
+                 n: 1
+               })) {
+                 continueTo(play);
                } else {
-                   wrap.transition()
-                       .styleTween('right', function() { return interpolate('-100%', '0%'); });
-
-                   editorPane
-                       .call(entityEditor.presets([preset]));
+                 continueTo(retryClickCircle);
                }
+             }, 500); // after transitioned actions
+           });
 
-           };
+           function continueTo(nextStep) {
+             context.on('enter.intro', null);
+             context.map().on('move.intro', null);
+             context.history().on('change.intro', null);
+             nextStep();
+           }
+         }
 
-           inspector.state = function(val) {
-               if (!arguments.length) return _state;
-               _state = val;
-               entityEditor.state(_state);
+         function retryClickCircle() {
+           context.enter(modeBrowse(context));
+           revealTank(tank, helpHtml('intro.buildings.retry_circle'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: function buttonCallback() {
+               continueTo(rightClickTank);
+             }
+           });
 
-               // remove any old field help overlay that might have gotten attached to the inspector
-               context.container().selectAll('.field-help-body').remove();
+           function continueTo(nextStep) {
+             nextStep();
+           }
+         }
 
-               return inspector;
-           };
+         function play() {
+           dispatch$1.call('done');
+           reveal('.ideditor', helpHtml('intro.buildings.play', {
+             next: _t('intro.startediting.title')
+           }), {
+             tooltipBox: '.intro-nav-wrap .chapter-startEditing',
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: function buttonCallback() {
+               reveal('.ideditor');
+             }
+           });
+         }
 
+         chapter.enter = function () {
+           addHouse();
+         };
 
-           inspector.entityIDs = function(val) {
-               if (!arguments.length) return _entityIDs;
-               _entityIDs = val;
-               return inspector;
-           };
+         chapter.exit = function () {
+           timeouts.forEach(window.clearTimeout);
+           context.on('enter.intro exit.intro', null);
+           context.map().on('move.intro drawn.intro', null);
+           context.history().on('change.intro', null);
+           context.container().select('.inspector-wrap').on('wheel.intro', null);
+           context.container().select('.preset-search-input').on('keydown.intro keyup.intro', null);
+           context.container().select('.more-fields .combobox-input').on('click.intro', null);
+         };
 
+         chapter.restart = function () {
+           chapter.exit();
+           chapter.enter();
+         };
 
-           inspector.newFeature = function(val) {
-               if (!arguments.length) return _newFeature;
-               _newFeature = val;
-               return inspector;
-           };
+         return utilRebind(chapter, dispatch$1, 'on');
+       }
 
+       function uiIntroStartEditing(context, reveal) {
+         var dispatch$1 = dispatch('done', 'startEditing');
+         var modalSelection = select(null);
+         var chapter = {
+           title: 'intro.startediting.title'
+         };
 
-           return inspector;
-       }
+         function showHelp() {
+           reveal('.map-control.help-control', helpHtml('intro.startediting.help'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: function buttonCallback() {
+               shortcuts();
+             }
+           });
+         }
 
-       function uiSidebar(context) {
-           var inspector = uiInspector(context);
-           var dataEditor = uiDataEditor(context);
-           var noteEditor = uiNoteEditor(context);
-           var improveOsmEditor = uiImproveOsmEditor(context);
-           var keepRightEditor = uiKeepRightEditor(context);
-           var osmoseEditor = uiOsmoseEditor(context);
-           var _current;
-           var _wasData = false;
-           var _wasNote = false;
-           var _wasQaItem = false;
-
-           // use pointer events on supported platforms; fallback to mouse events
-           var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
-
-
-           function sidebar(selection) {
-               var container = context.container();
-               var minWidth = 240;
-               var sidebarWidth;
-               var containerWidth;
-               var dragOffset;
-
-               // Set the initial width constraints
-               selection
-                   .style('min-width', minWidth + 'px')
-                   .style('max-width', '400px')
-                   .style('width', '33.3333%');
-
-               var resizer = selection
-                   .append('div')
-                   .attr('class', 'sidebar-resizer')
-                   .on(_pointerPrefix + 'down.sidebar-resizer', pointerdown);
+         function shortcuts() {
+           reveal('.map-control.help-control', helpHtml('intro.startediting.shortcuts'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: function buttonCallback() {
+               showSave();
+             }
+           });
+         }
 
-               var downPointerId, lastClientX, containerLocGetter;
+         function showSave() {
+           context.container().selectAll('.shaded').remove(); // in case user opened keyboard shortcuts
 
-               function pointerdown() {
-                   if (downPointerId) return;
+           reveal('.top-toolbar button.save', helpHtml('intro.startediting.save'), {
+             buttonText: _t.html('intro.ok'),
+             buttonCallback: function buttonCallback() {
+               showStart();
+             }
+           });
+         }
 
-                   if ('button' in event && event.button !== 0) return;
+         function showStart() {
+           context.container().selectAll('.shaded').remove(); // in case user opened keyboard shortcuts
 
-                   downPointerId = event.pointerId || 'mouse';
+           modalSelection = uiModal(context.container());
+           modalSelection.select('.modal').attr('class', 'modal-splash modal');
+           modalSelection.selectAll('.close').remove();
+           var startbutton = modalSelection.select('.content').attr('class', 'fillL').append('button').attr('class', 'modal-section huge-modal-button').on('click', function () {
+             modalSelection.remove();
+           });
+           startbutton.append('svg').attr('class', 'illustration').append('use').attr('xlink:href', '#iD-logo-walkthrough');
+           startbutton.append('h2').html(_t.html('intro.startediting.start'));
+           dispatch$1.call('startEditing');
+         }
 
-                   lastClientX = event.clientX;
+         chapter.enter = function () {
+           showHelp();
+         };
 
-                   containerLocGetter = utilFastMouse(container.node());
+         chapter.exit = function () {
+           modalSelection.remove();
+           context.container().selectAll('.shaded').remove(); // in case user opened keyboard shortcuts
+         };
 
-                   // offset from edge of sidebar-resizer
-                   dragOffset = utilFastMouse(resizer.node())(event)[0] - 1;
+         return utilRebind(chapter, dispatch$1, 'on');
+       }
 
-                   sidebarWidth = selection.node().getBoundingClientRect().width;
-                   containerWidth = container.node().getBoundingClientRect().width;
-                   var widthPct = (sidebarWidth / containerWidth) * 100;
-                   selection
-                       .style('width', widthPct + '%')    // lock in current width
-                       .style('max-width', '85%');        // but allow larger widths
+       var chapterUi = {
+         welcome: uiIntroWelcome,
+         navigation: uiIntroNavigation,
+         point: uiIntroPoint,
+         area: uiIntroArea,
+         line: uiIntroLine,
+         building: uiIntroBuilding,
+         startEditing: uiIntroStartEditing
+       };
+       var chapterFlow = ['welcome', 'navigation', 'point', 'area', 'line', 'building', 'startEditing'];
+       function uiIntro(context) {
+         var INTRO_IMAGERY = 'EsriWorldImageryClarity';
+         var _introGraph = {};
 
-                   resizer.classed('dragging', true);
+         var _currChapter;
 
-                   select(window)
-                       .on('touchmove.sidebar-resizer', function() {
-                           // disable page scrolling while resizing on touch input
-                           event.preventDefault();
-                       }, { passive: false })
-                       .on(_pointerPrefix + 'move.sidebar-resizer', pointermove)
-                       .on(_pointerPrefix + 'up.sidebar-resizer pointercancel.sidebar-resizer', pointerup);
+         function intro(selection) {
+           _mainFileFetcher.get('intro_graph').then(function (dataIntroGraph) {
+             // create entities for intro graph and localize names
+             for (var id in dataIntroGraph) {
+               if (!_introGraph[id]) {
+                 _introGraph[id] = osmEntity(localize(dataIntroGraph[id]));
                }
+             }
 
-               function pointermove() {
+             selection.call(startIntro);
+           })["catch"](function () {
+             /* ignore */
+           });
+         }
 
-                   if (downPointerId !== (event.pointerId || 'mouse')) return;
+         function startIntro(selection) {
+           context.enter(modeBrowse(context)); // Save current map state
 
-                   event.preventDefault();
+           var osm = context.connection();
+           var history = context.history().toJSON();
+           var hash = window.location.hash;
+           var center = context.map().center();
+           var zoom = context.map().zoom();
+           var background = context.background().baseLayerSource();
+           var overlays = context.background().overlayLayerSources();
+           var opacity = context.container().selectAll('.main-map .layer-background').style('opacity');
+           var caches = osm && osm.caches();
+           var baseEntities = context.history().graph().base().entities; // Show sidebar and disable the sidebar resizing button
+           // (this needs to be before `context.inIntro(true)`)
 
-                   var dx = event.clientX - lastClientX;
+           context.ui().sidebar.expand();
+           context.container().selectAll('button.sidebar-toggle').classed('disabled', true); // Block saving
 
-                   lastClientX = event.clientX;
+           context.inIntro(true); // Load semi-real data used in intro
 
-                   var isRTL = (_mainLocalizer.textDirection() === 'rtl');
-                   var scaleX = isRTL ? 0 : 1;
-                   var xMarginProperty = isRTL ? 'margin-right' : 'margin-left';
+           if (osm) {
+             osm.toggle(false).reset();
+           }
 
-                   var x = containerLocGetter(event)[0] - dragOffset;
-                   sidebarWidth = isRTL ? containerWidth - x : x;
+           context.history().reset();
+           context.history().merge(Object.values(coreGraph().load(_introGraph).entities));
+           context.history().checkpoint('initial'); // Setup imagery
 
-                   var isCollapsed = selection.classed('collapsed');
-                   var shouldCollapse = sidebarWidth < minWidth;
+           var imagery = context.background().findSource(INTRO_IMAGERY);
 
-                   selection.classed('collapsed', shouldCollapse);
+           if (imagery) {
+             context.background().baseLayerSource(imagery);
+           } else {
+             context.background().bing();
+           }
 
-                   if (shouldCollapse) {
-                       if (!isCollapsed) {
-                           selection
-                               .style(xMarginProperty, '-400px')
-                               .style('width', '400px');
+           overlays.forEach(function (d) {
+             return context.background().toggleOverlayLayer(d);
+           }); // Setup data layers (only OSM)
 
-                           context.ui().onResize([(sidebarWidth - dx) * scaleX, 0]);
-                       }
+           var layers = context.layers();
+           layers.all().forEach(function (item) {
+             // if the layer has the function `enabled`
+             if (typeof item.layer.enabled === 'function') {
+               item.layer.enabled(item.id === 'osm');
+             }
+           });
+           context.container().selectAll('.main-map .layer-background').style('opacity', 1);
+           var curtain = uiCurtain(context.container().node());
+           selection.call(curtain); // Store that the user started the walkthrough..
 
-                   } else {
-                       var widthPct = (sidebarWidth / containerWidth) * 100;
-                       selection
-                           .style(xMarginProperty, null)
-                           .style('width', widthPct + '%');
-
-                       if (isCollapsed) {
-                           context.ui().onResize([-sidebarWidth * scaleX, 0]);
-                       } else {
-                           context.ui().onResize([-dx * scaleX, 0]);
-                       }
-                   }
-               }
+           corePreferences('walkthrough_started', 'yes'); // Restore previous walkthrough progress..
 
-               function pointerup() {
-                   if (downPointerId !== (event.pointerId || 'mouse')) return;
+           var storedProgress = corePreferences('walkthrough_progress') || '';
+           var progress = storedProgress.split(';').filter(Boolean);
+           var chapters = chapterFlow.map(function (chapter, i) {
+             var s = chapterUi[chapter](context, curtain.reveal).on('done', function () {
+               buttons.filter(function (d) {
+                 return d.title === s.title;
+               }).classed('finished', true);
 
-                   downPointerId = null;
+               if (i < chapterFlow.length - 1) {
+                 var next = chapterFlow[i + 1];
+                 context.container().select("button.chapter-".concat(next)).classed('next', true);
+               } // Store walkthrough progress..
 
-                   resizer.classed('dragging', false);
 
-                   select(window)
-                       .on('touchmove.sidebar-resizer', null)
-                       .on(_pointerPrefix + 'move.sidebar-resizer', null)
-                       .on(_pointerPrefix + 'up.sidebar-resizer pointercancel.sidebar-resizer', null);
-               }
+               progress.push(chapter);
+               corePreferences('walkthrough_progress', utilArrayUniq(progress).join(';'));
+             });
+             return s;
+           });
+           chapters[chapters.length - 1].on('startEditing', function () {
+             // Store walkthrough progress..
+             progress.push('startEditing');
+             corePreferences('walkthrough_progress', utilArrayUniq(progress).join(';')); // Store if walkthrough is completed..
 
-               var featureListWrap = selection
-                   .append('div')
-                   .attr('class', 'feature-list-pane')
-                   .call(uiFeatureList(context));
+             var incomplete = utilArrayDifference(chapterFlow, progress);
 
-               var inspectorWrap = selection
-                   .append('div')
-                   .attr('class', 'inspector-hidden inspector-wrap');
+             if (!incomplete.length) {
+               corePreferences('walkthrough_completed', 'yes');
+             }
 
-               var hoverModeSelect = function(targets) {
-                   context.container().selectAll('.feature-list-item').classed('hover', false);
+             curtain.remove();
+             navwrap.remove();
+             context.container().selectAll('.main-map .layer-background').style('opacity', opacity);
+             context.container().selectAll('button.sidebar-toggle').classed('disabled', false);
 
-                   if (context.selectedIDs().length > 1 &&
-                       targets && targets.length) {
+             if (osm) {
+               osm.toggle(true).reset().caches(caches);
+             }
 
-                       var elements = context.container().selectAll('.feature-list-item')
-                           .filter(function (node) {
-                               return targets.indexOf(node) !== -1;
-                           });
+             context.history().reset().merge(Object.values(baseEntities));
+             context.background().baseLayerSource(background);
+             overlays.forEach(function (d) {
+               return context.background().toggleOverlayLayer(d);
+             });
 
-                       if (!elements.empty()) {
-                           elements.classed('hover', true);
-                       }
-                   }
-               };
+             if (history) {
+               context.history().fromJSON(history, false);
+             }
 
-               sidebar.hoverModeSelect = throttle(hoverModeSelect, 200);
+             context.map().centerZoom(center, zoom);
+             window.location.replace(hash);
+             context.inIntro(false);
+           });
+           var navwrap = selection.append('div').attr('class', 'intro-nav-wrap fillD');
+           navwrap.append('svg').attr('class', 'intro-nav-wrap-logo').append('use').attr('xlink:href', '#iD-logo-walkthrough');
+           var buttonwrap = navwrap.append('div').attr('class', 'joined').selectAll('button.chapter');
+           var buttons = buttonwrap.data(chapters).enter().append('button').attr('class', function (d, i) {
+             return "chapter chapter-".concat(chapterFlow[i]);
+           }).on('click', enterChapter);
+           buttons.append('span').html(function (d) {
+             return _t.html(d.title);
+           });
+           buttons.append('span').attr('class', 'status').call(svgIcon(_mainLocalizer.textDirection() === 'rtl' ? '#iD-icon-backward' : '#iD-icon-forward', 'inline'));
+           enterChapter(null, chapters[0]);
 
-               function hover(targets) {
-                   var datum = targets && targets.length && targets[0];
-                   if (datum && datum.__featurehash__) {   // hovering on data
-                       _wasData = true;
-                       sidebar
-                           .show(dataEditor.datum(datum));
+           function enterChapter(d3_event, newChapter) {
+             if (_currChapter) {
+               _currChapter.exit();
+             }
 
-                       selection.selectAll('.sidebar-component')
-                           .classed('inspector-hover', true);
+             context.enter(modeBrowse(context));
+             _currChapter = newChapter;
 
-                   } else if (datum instanceof osmNote) {
-                       if (context.mode().id === 'drag-note') return;
-                       _wasNote = true;
+             _currChapter.enter();
 
-                       var osm = services.osm;
-                       if (osm) {
-                           datum = osm.getNote(datum.id);   // marker may contain stale data - get latest
-                       }
+             buttons.classed('next', false).classed('active', function (d) {
+               return d.title === _currChapter.title;
+             });
+           }
+         }
 
-                       sidebar
-                           .show(noteEditor.note(datum));
+         return intro;
+       }
 
-                       selection.selectAll('.sidebar-component')
-                           .classed('inspector-hover', true);
+       function uiIssuesInfo(context) {
+         var warningsItem = {
+           id: 'warnings',
+           count: 0,
+           iconID: 'iD-icon-alert',
+           descriptionID: 'issues.warnings_and_errors'
+         };
+         var resolvedItem = {
+           id: 'resolved',
+           count: 0,
+           iconID: 'iD-icon-apply',
+           descriptionID: 'issues.user_resolved_issues'
+         };
+
+         function update(selection) {
+           var shownItems = [];
+           var liveIssues = context.validator().getIssues({
+             what: corePreferences('validate-what') || 'edited',
+             where: corePreferences('validate-where') || 'all'
+           });
 
-                   } else if (datum instanceof QAItem) {
-                       _wasQaItem = true;
+           if (liveIssues.length) {
+             warningsItem.count = liveIssues.length;
+             shownItems.push(warningsItem);
+           }
 
-                       var errService = services[datum.service];
-                       if (errService) {
-                           // marker may contain stale data - get latest
-                           datum = errService.getError(datum.id);
-                       }
+           if (corePreferences('validate-what') === 'all') {
+             var resolvedIssues = context.validator().getResolvedIssues();
 
-                       // Currently only three possible services
-                       var errEditor;
-                       if (datum.service === 'keepRight') {
-                           errEditor = keepRightEditor;
-                       } else if (datum.service === 'osmose') {
-                           errEditor = osmoseEditor;
-                       } else {
-                           errEditor = improveOsmEditor;
-                       }
+             if (resolvedIssues.length) {
+               resolvedItem.count = resolvedIssues.length;
+               shownItems.push(resolvedItem);
+             }
+           }
 
-                       context.container().selectAll('.qaItem.' + datum.service)
-                           .classed('hover', function(d) { return d.id === datum.id; });
+           var chips = selection.selectAll('.chip').data(shownItems, function (d) {
+             return d.id;
+           });
+           chips.exit().remove();
+           var enter = chips.enter().append('a').attr('class', function (d) {
+             return 'chip ' + d.id + '-count';
+           }).attr('href', '#').each(function (d) {
+             var chipSelection = select(this);
+             var tooltipBehavior = uiTooltip().placement('top').title(_t.html(d.descriptionID));
+             chipSelection.call(tooltipBehavior).on('click', function (d3_event) {
+               d3_event.preventDefault();
+               tooltipBehavior.hide(select(this)); // open the Issues pane
+
+               context.ui().togglePanes(context.container().select('.map-panes .issues-pane'));
+             });
+             chipSelection.call(svgIcon('#' + d.iconID));
+           });
+           enter.append('span').attr('class', 'count');
+           enter.merge(chips).selectAll('span.count').html(function (d) {
+             return d.count.toString();
+           });
+         }
 
-                       sidebar
-                           .show(errEditor.error(datum));
+         return function (selection) {
+           update(selection);
+           context.validator().on('validated.infobox', function () {
+             update(selection);
+           });
+         };
+       }
 
-                       selection.selectAll('.sidebar-component')
-                           .classed('inspector-hover', true);
+       function uiMapInMap(context) {
+         function mapInMap(selection) {
+           var backgroundLayer = rendererTileLayer(context);
+           var overlayLayers = {};
+           var projection = geoRawMercator();
+           var dataLayer = svgData(projection, context).showLabels(false);
+           var debugLayer = svgDebug(projection, context);
+           var zoom = d3_zoom().scaleExtent([geoZoomToScale(0.5), geoZoomToScale(24)]).on('start', zoomStarted).on('zoom', zoomed).on('end', zoomEnded);
+           var wrap = select(null);
+           var tiles = select(null);
+           var viewport = select(null);
+           var _isTransformed = false;
+           var _isHidden = true;
+           var _skipEvents = false;
+           var _gesture = null;
+           var _zDiff = 6; // by default, minimap renders at (main zoom - 6)
 
-                   } else if (!_current && (datum instanceof osmEntity)) {
-                       featureListWrap
-                           .classed('inspector-hidden', true);
+           var _dMini; // dimensions of minimap
 
-                       inspectorWrap
-                           .classed('inspector-hidden', false)
-                           .classed('inspector-hover', true);
 
-                       if (!inspector.entityIDs() || !utilArrayIdentical(inspector.entityIDs(), [datum.id]) || inspector.state() !== 'hover') {
-                           inspector
-                               .state('hover')
-                               .entityIDs([datum.id])
-                               .newFeature(false);
+           var _cMini; // center pixel of minimap
 
-                           inspectorWrap
-                               .call(inspector);
-                       }
 
-                   } else if (!_current) {
-                       featureListWrap
-                           .classed('inspector-hidden', false);
-                       inspectorWrap
-                           .classed('inspector-hidden', true);
-                       inspector
-                           .state('hide');
-
-                   } else if (_wasData || _wasNote || _wasQaItem) {
-                       _wasNote = false;
-                       _wasData = false;
-                       _wasQaItem = false;
-                       context.container().selectAll('.note').classed('hover', false);
-                       context.container().selectAll('.qaItem').classed('hover', false);
-                       sidebar.hide();
-                   }
-               }
+           var _tStart; // transform at start of gesture
 
-               sidebar.hover = throttle(hover, 200);
 
+           var _tCurr; // transform at most recent event
 
-               sidebar.intersects = function(extent) {
-                   var rect = selection.node().getBoundingClientRect();
-                   return extent.intersects([
-                       context.projection.invert([0, rect.height]),
-                       context.projection.invert([rect.width, 0])
-                   ]);
-               };
 
+           var _timeoutID;
 
-               sidebar.select = function(ids, newFeature) {
-                   sidebar.hide();
+           function zoomStarted() {
+             if (_skipEvents) return;
+             _tStart = _tCurr = projection.transform();
+             _gesture = null;
+           }
 
-                   if (ids && ids.length) {
+           function zoomed(d3_event) {
+             if (_skipEvents) return;
+             var x = d3_event.transform.x;
+             var y = d3_event.transform.y;
+             var k = d3_event.transform.k;
+             var isZooming = k !== _tStart.k;
+             var isPanning = x !== _tStart.x || y !== _tStart.y;
 
-                       var entity = ids.length === 1 && context.entity(ids[0]);
-                       if (entity && newFeature && selection.classed('collapsed')) {
-                           // uncollapse the sidebar
-                           var extent = entity.extent(context.graph());
-                           sidebar.expand(sidebar.intersects(extent));
-                       }
+             if (!isZooming && !isPanning) {
+               return; // no change
+             } // lock in either zooming or panning, don't allow both in minimap.
 
-                       featureListWrap
-                           .classed('inspector-hidden', true);
 
-                       inspectorWrap
-                           .classed('inspector-hidden', false)
-                           .classed('inspector-hover', false);
+             if (!_gesture) {
+               _gesture = isZooming ? 'zoom' : 'pan';
+             }
 
-                       if (!inspector.entityIDs() || !utilArrayIdentical(inspector.entityIDs(), ids) || inspector.state() !== 'select') {
-                           inspector
-                               .state('select')
-                               .entityIDs(ids)
-                               .newFeature(newFeature);
+             var tMini = projection.transform();
+             var tX, tY, scale;
 
-                           inspectorWrap
-                               .call(inspector);
-                       }
+             if (_gesture === 'zoom') {
+               scale = k / tMini.k;
+               tX = (_cMini[0] / scale - _cMini[0]) * scale;
+               tY = (_cMini[1] / scale - _cMini[1]) * scale;
+             } else {
+               k = tMini.k;
+               scale = 1;
+               tX = x - tMini.x;
+               tY = y - tMini.y;
+             }
+
+             utilSetTransform(tiles, tX, tY, scale);
+             utilSetTransform(viewport, 0, 0, scale);
+             _isTransformed = true;
+             _tCurr = identity$2.translate(x, y).scale(k);
+             var zMain = geoScaleToZoom(context.projection.scale());
+             var zMini = geoScaleToZoom(k);
+             _zDiff = zMain - zMini;
+             queueRedraw();
+           }
+
+           function zoomEnded() {
+             if (_skipEvents) return;
+             if (_gesture !== 'pan') return;
+             updateProjection();
+             _gesture = null;
+             context.map().center(projection.invert(_cMini)); // recenter main map..
+           }
+
+           function updateProjection() {
+             var loc = context.map().center();
+             var tMain = context.projection.transform();
+             var zMain = geoScaleToZoom(tMain.k);
+             var zMini = Math.max(zMain - _zDiff, 0.5);
+             var kMini = geoZoomToScale(zMini);
+             projection.translate([tMain.x, tMain.y]).scale(kMini);
+             var point = projection(loc);
+             var mouse = _gesture === 'pan' ? geoVecSubtract([_tCurr.x, _tCurr.y], [_tStart.x, _tStart.y]) : [0, 0];
+             var xMini = _cMini[0] - point[0] + tMain.x + mouse[0];
+             var yMini = _cMini[1] - point[1] + tMain.y + mouse[1];
+             projection.translate([xMini, yMini]).clipExtent([[0, 0], _dMini]);
+             _tCurr = projection.transform();
+
+             if (_isTransformed) {
+               utilSetTransform(tiles, 0, 0);
+               utilSetTransform(viewport, 0, 0);
+               _isTransformed = false;
+             }
 
-                   } else {
-                       inspector
-                           .state('hide');
-                   }
-               };
+             zoom.scaleExtent([geoZoomToScale(0.5), geoZoomToScale(zMain - 3)]);
+             _skipEvents = true;
+             wrap.call(zoom.transform, _tCurr);
+             _skipEvents = false;
+           }
 
+           function redraw() {
+             clearTimeout(_timeoutID);
+             if (_isHidden) return;
+             updateProjection();
+             var zMini = geoScaleToZoom(projection.scale()); // setup tile container
 
-               sidebar.showPresetList = function() {
-                   inspector.showList();
-               };
+             tiles = wrap.selectAll('.map-in-map-tiles').data([0]);
+             tiles = tiles.enter().append('div').attr('class', 'map-in-map-tiles').merge(tiles); // redraw background
 
+             backgroundLayer.source(context.background().baseLayerSource()).projection(projection).dimensions(_dMini);
+             var background = tiles.selectAll('.map-in-map-background').data([0]);
+             background.enter().append('div').attr('class', 'map-in-map-background').merge(background).call(backgroundLayer); // redraw overlay
 
-               sidebar.show = function(component, element) {
-                   featureListWrap
-                       .classed('inspector-hidden', true);
-                   inspectorWrap
-                       .classed('inspector-hidden', true);
+             var overlaySources = context.background().overlayLayerSources();
+             var activeOverlayLayers = [];
 
-                   if (_current) _current.remove();
-                   _current = selection
-                       .append('div')
-                       .attr('class', 'sidebar-component')
-                       .call(component, element);
-               };
+             for (var i = 0; i < overlaySources.length; i++) {
+               if (overlaySources[i].validZoom(zMini)) {
+                 if (!overlayLayers[i]) overlayLayers[i] = rendererTileLayer(context);
+                 activeOverlayLayers.push(overlayLayers[i].source(overlaySources[i]).projection(projection).dimensions(_dMini));
+               }
+             }
 
+             var overlay = tiles.selectAll('.map-in-map-overlay').data([0]);
+             overlay = overlay.enter().append('div').attr('class', 'map-in-map-overlay').merge(overlay);
+             var overlays = overlay.selectAll('div').data(activeOverlayLayers, function (d) {
+               return d.source().name();
+             });
+             overlays.exit().remove();
+             overlays = overlays.enter().append('div').merge(overlays).each(function (layer) {
+               select(this).call(layer);
+             });
+             var dataLayers = tiles.selectAll('.map-in-map-data').data([0]);
+             dataLayers.exit().remove();
+             dataLayers = dataLayers.enter().append('svg').attr('class', 'map-in-map-data').merge(dataLayers).call(dataLayer).call(debugLayer); // redraw viewport bounding box
+
+             if (_gesture !== 'pan') {
+               var getPath = d3_geoPath(projection);
+               var bbox = {
+                 type: 'Polygon',
+                 coordinates: [context.map().extent().polygon()]
+               };
+               viewport = wrap.selectAll('.map-in-map-viewport').data([0]);
+               viewport = viewport.enter().append('svg').attr('class', 'map-in-map-viewport').merge(viewport);
+               var path = viewport.selectAll('.map-in-map-bbox').data([bbox]);
+               path.enter().append('path').attr('class', 'map-in-map-bbox').merge(path).attr('d', getPath).classed('thick', function (d) {
+                 return getPath.area(d) < 30;
+               });
+             }
+           }
 
-               sidebar.hide = function() {
-                   featureListWrap
-                       .classed('inspector-hidden', false);
-                   inspectorWrap
-                       .classed('inspector-hidden', true);
+           function queueRedraw() {
+             clearTimeout(_timeoutID);
+             _timeoutID = setTimeout(function () {
+               redraw();
+             }, 750);
+           }
 
-                   if (_current) _current.remove();
-                   _current = null;
-               };
+           function toggle(d3_event) {
+             if (d3_event) d3_event.preventDefault();
+             _isHidden = !_isHidden;
+             context.container().select('.minimap-toggle-item').classed('active', !_isHidden).select('input').property('checked', !_isHidden);
 
+             if (_isHidden) {
+               wrap.style('display', 'block').style('opacity', '1').transition().duration(200).style('opacity', '0').on('end', function () {
+                 selection.selectAll('.map-in-map').style('display', 'none');
+               });
+             } else {
+               wrap.style('display', 'block').style('opacity', '0').transition().duration(200).style('opacity', '1').on('end', function () {
+                 redraw();
+               });
+             }
+           }
 
-               sidebar.expand = function(moveMap) {
-                   if (selection.classed('collapsed')) {
-                       sidebar.toggle(moveMap);
-                   }
-               };
+           uiMapInMap.toggle = toggle;
+           wrap = selection.selectAll('.map-in-map').data([0]);
+           wrap = wrap.enter().append('div').attr('class', 'map-in-map').style('display', _isHidden ? 'none' : 'block').call(zoom).on('dblclick.zoom', null).merge(wrap); // reflow warning: Hardcode dimensions - currently can't resize it anyway..
 
+           _dMini = [200, 150]; //utilGetDimensions(wrap);
 
-               sidebar.collapse = function(moveMap) {
-                   if (!selection.classed('collapsed')) {
-                       sidebar.toggle(moveMap);
-                   }
-               };
+           _cMini = geoVecScale(_dMini, 0.5);
+           context.map().on('drawn.map-in-map', function (drawn) {
+             if (drawn.full === true) {
+               redraw();
+             }
+           });
+           redraw();
+           context.keybinding().on(_t('background.minimap.key'), toggle);
+         }
 
+         return mapInMap;
+       }
 
-               sidebar.toggle = function(moveMap) {
-                   var e = event;
-                   if (e && e.sourceEvent) {
-                       e.sourceEvent.preventDefault();
-                   } else if (e) {
-                       e.preventDefault();
-                   }
+       function uiNotice(context) {
+         return function (selection) {
+           var div = selection.append('div').attr('class', 'notice');
+           var button = div.append('button').attr('class', 'zoom-to notice fillD').on('click', function () {
+             context.map().zoomEase(context.minEditableZoom());
+           }).on('wheel', function (d3_event) {
+             // let wheel events pass through #4482
+             var e2 = new WheelEvent(d3_event.type, d3_event);
+             context.surface().node().dispatchEvent(e2);
+           });
+           button.call(svgIcon('#iD-icon-plus', 'pre-text')).append('span').attr('class', 'label').html(_t.html('zoom_in_edit'));
 
-                   // Don't allow sidebar to toggle when the user is in the walkthrough.
-                   if (context.inIntro()) return;
+           function disableTooHigh() {
+             var canEdit = context.map().zoom() >= context.minEditableZoom();
+             div.style('display', canEdit ? 'none' : 'block');
+           }
 
-                   var isCollapsed = selection.classed('collapsed');
-                   var isCollapsing = !isCollapsed;
-                   var isRTL = (_mainLocalizer.textDirection() === 'rtl');
-                   var scaleX = isRTL ? 0 : 1;
-                   var xMarginProperty = isRTL ? 'margin-right' : 'margin-left';
+           context.map().on('move.notice', debounce(disableTooHigh, 500));
+           disableTooHigh();
+         };
+       }
 
-                   sidebarWidth = selection.node().getBoundingClientRect().width;
+       function uiPhotoviewer(context) {
+         var dispatch$1 = dispatch('resize');
 
-                   // switch from % to px
-                   selection.style('width', sidebarWidth + 'px');
+         var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
 
-                   var startMargin, endMargin, lastMargin;
-                   if (isCollapsing) {
-                       startMargin = lastMargin = 0;
-                       endMargin = -sidebarWidth;
-                   } else {
-                       startMargin = lastMargin = -sidebarWidth;
-                       endMargin = 0;
-                   }
+         function photoviewer(selection) {
+           selection.append('button').attr('class', 'thumb-hide').on('click', function () {
+             if (services.streetside) {
+               services.streetside.hideViewer(context);
+             }
 
-                   selection.transition()
-                       .style(xMarginProperty, endMargin + 'px')
-                       .tween('panner', function() {
-                           var i = d3_interpolateNumber(startMargin, endMargin);
-                           return function(t) {
-                               var dx = lastMargin - Math.round(i(t));
-                               lastMargin = lastMargin - dx;
-                               context.ui().onResize(moveMap ? undefined : [dx * scaleX, 0]);
-                           };
-                       })
-                       .on('end', function() {
-                           selection.classed('collapsed', isCollapsing);
-
-                           // switch back from px to %
-                           if (!isCollapsing) {
-                               var containerWidth = container.node().getBoundingClientRect().width;
-                               var widthPct = (sidebarWidth / containerWidth) * 100;
-                               selection
-                                   .style(xMarginProperty, null)
-                                   .style('width', widthPct + '%');
-                           }
-                       });
-               };
+             if (services.mapillary) {
+               services.mapillary.hideViewer(context);
+             }
 
-               // toggle the sidebar collapse when double-clicking the resizer
-               resizer.on('dblclick', sidebar.toggle);
+             if (services.openstreetcam) {
+               services.openstreetcam.hideViewer(context);
+             }
+           }).append('div').call(svgIcon('#iD-icon-close'));
 
-               // ensure hover sidebar is closed when zooming out beyond editable zoom
-               context.map().on('crossEditableZoom.sidebar', function(within) {
-                   if (!within && !selection.select('.inspector-hover').empty()) {
-                       hover([]);
-                   }
-               });
+           function preventDefault(d3_event) {
+             d3_event.preventDefault();
            }
 
-           sidebar.showPresetList = function() {};
-           sidebar.hover = function() {};
-           sidebar.hover.cancel = function() {};
-           sidebar.intersects = function() {};
-           sidebar.select = function() {};
-           sidebar.show = function() {};
-           sidebar.hide = function() {};
-           sidebar.expand = function() {};
-           sidebar.collapse = function() {};
-           sidebar.toggle = function() {};
+           selection.append('button').attr('class', 'resize-handle-xy').on('touchstart touchdown touchend', preventDefault).on(_pointerPrefix + 'down', buildResizeListener(selection, 'resize', dispatch$1, {
+             resizeOnX: true,
+             resizeOnY: true
+           }));
+           selection.append('button').attr('class', 'resize-handle-x').on('touchstart touchdown touchend', preventDefault).on(_pointerPrefix + 'down', buildResizeListener(selection, 'resize', dispatch$1, {
+             resizeOnX: true
+           }));
+           selection.append('button').attr('class', 'resize-handle-y').on('touchstart touchdown touchend', preventDefault).on(_pointerPrefix + 'down', buildResizeListener(selection, 'resize', dispatch$1, {
+             resizeOnY: true
+           }));
 
-           return sidebar;
-       }
+           function buildResizeListener(target, eventName, dispatch, options) {
+             var resizeOnX = !!options.resizeOnX;
+             var resizeOnY = !!options.resizeOnY;
+             var minHeight = options.minHeight || 240;
+             var minWidth = options.minWidth || 320;
+             var pointerId;
+             var startX;
+             var startY;
+             var startWidth;
+             var startHeight;
 
-       function uiSourceSwitch(context) {
-           var keys;
+             function startResize(d3_event) {
+               if (pointerId !== (d3_event.pointerId || 'mouse')) return;
+               d3_event.preventDefault();
+               d3_event.stopPropagation();
+               var mapSize = context.map().dimensions();
 
+               if (resizeOnX) {
+                 var maxWidth = mapSize[0];
+                 var newWidth = clamp(startWidth + d3_event.clientX - startX, minWidth, maxWidth);
+                 target.style('width', newWidth + 'px');
+               }
 
-           function click() {
-               event.preventDefault();
+               if (resizeOnY) {
+                 var maxHeight = mapSize[1] - 90; // preserve space at top/bottom of map
 
-               var osm = context.connection();
-               if (!osm) return;
+                 var newHeight = clamp(startHeight + startY - d3_event.clientY, minHeight, maxHeight);
+                 target.style('height', newHeight + 'px');
+               }
 
-               if (context.inIntro()) return;
+               dispatch.call(eventName, target, utilGetDimensions(target, true));
+             }
 
-               if (context.history().hasChanges() &&
-                   !window.confirm(_t('source_switch.lose_changes'))) return;
+             function clamp(num, min, max) {
+               return Math.max(min, Math.min(num, max));
+             }
 
-               var isLive = select(this)
-                   .classed('live');
+             function stopResize(d3_event) {
+               if (pointerId !== (d3_event.pointerId || 'mouse')) return;
+               d3_event.preventDefault();
+               d3_event.stopPropagation(); // remove all the listeners we added
 
-               isLive = !isLive;
-               context.enter(modeBrowse(context));
-               context.history().clearSaved();          // remove saved history
-               context.flush();                         // remove stored data
+               select(window).on('.' + eventName, null);
+             }
 
-               select(this)
-                   .text(isLive ? _t('source_switch.live') : _t('source_switch.dev'))
-                   .classed('live', isLive)
-                   .classed('chip', isLive);
+             return function initResize(d3_event) {
+               d3_event.preventDefault();
+               d3_event.stopPropagation();
+               pointerId = d3_event.pointerId || 'mouse';
+               startX = d3_event.clientX;
+               startY = d3_event.clientY;
+               var targetRect = target.node().getBoundingClientRect();
+               startWidth = targetRect.width;
+               startHeight = targetRect.height;
+               select(window).on(_pointerPrefix + 'move.' + eventName, startResize, false).on(_pointerPrefix + 'up.' + eventName, stopResize, false);
 
-               osm.switch(isLive ? keys[0] : keys[1]);  // switch connection (warning: dispatches 'change' event)
+               if (_pointerPrefix === 'pointer') {
+                 select(window).on('pointercancel.' + eventName, stopResize, false);
+               }
+             };
            }
+         }
 
-           var sourceSwitch = function(selection) {
-               selection
-                   .append('a')
-                   .attr('href', '#')
-                   .text(_t('source_switch.live'))
-                   .attr('class', 'live chip')
-                   .on('click', click);
-           };
+         photoviewer.onMapResize = function () {
+           var photoviewer = context.container().select('.photoviewer');
+           var content = context.container().select('.main-content');
+           var mapDimensions = utilGetDimensions(content, true); // shrink photo viewer if it is too big
+           // (-90 preserves space at top and bottom of map used by menus)
 
+           var photoDimensions = utilGetDimensions(photoviewer, true);
 
-           sourceSwitch.keys = function(_) {
-               if (!arguments.length) return keys;
-               keys = _;
-               return sourceSwitch;
-           };
+           if (photoDimensions[0] > mapDimensions[0] || photoDimensions[1] > mapDimensions[1] - 90) {
+             var setPhotoDimensions = [Math.min(photoDimensions[0], mapDimensions[0]), Math.min(photoDimensions[1], mapDimensions[1] - 90)];
+             photoviewer.style('width', setPhotoDimensions[0] + 'px').style('height', setPhotoDimensions[1] + 'px');
+             dispatch$1.call('resize', photoviewer, setPhotoDimensions);
+           }
+         };
 
+         return utilRebind(photoviewer, dispatch$1, 'on');
+       }
 
-           return sourceSwitch;
+       function uiRestore(context) {
+         return function (selection) {
+           if (!context.history().hasRestorableChanges()) return;
+           var modalSelection = uiModal(selection, true);
+           modalSelection.select('.modal').attr('class', 'modal fillL');
+           var introModal = modalSelection.select('.content');
+           introModal.append('div').attr('class', 'modal-section').append('h3').html(_t.html('restore.heading'));
+           introModal.append('div').attr('class', 'modal-section').append('p').html(_t.html('restore.description'));
+           var buttonWrap = introModal.append('div').attr('class', 'modal-actions');
+           var restore = buttonWrap.append('button').attr('class', 'restore').on('click', function () {
+             context.history().restore();
+             modalSelection.remove();
+           });
+           restore.append('svg').attr('class', 'logo logo-restore').append('use').attr('xlink:href', '#iD-logo-restore');
+           restore.append('div').html(_t.html('restore.restore'));
+           var reset = buttonWrap.append('button').attr('class', 'reset').on('click', function () {
+             context.history().clearSaved();
+             modalSelection.remove();
+           });
+           reset.append('svg').attr('class', 'logo logo-reset').append('use').attr('xlink:href', '#iD-logo-reset');
+           reset.append('div').html(_t.html('restore.reset'));
+           restore.node().focus();
+         };
        }
 
-       function uiSpinner(context) {
-           var osm = context.connection();
+       function uiScale(context) {
+         var projection = context.projection,
+             isImperial = !_mainLocalizer.usesMetric(),
+             maxLength = 180,
+             tickHeight = 8;
+
+         function scaleDefs(loc1, loc2) {
+           var lat = (loc2[1] + loc1[1]) / 2,
+               conversion = isImperial ? 3.28084 : 1,
+               dist = geoLonToMeters(loc2[0] - loc1[0], lat) * conversion,
+               scale = {
+             dist: 0,
+             px: 0,
+             text: ''
+           },
+               buckets,
+               i,
+               val,
+               dLon;
 
+           if (isImperial) {
+             buckets = [5280000, 528000, 52800, 5280, 500, 50, 5, 1];
+           } else {
+             buckets = [5000000, 500000, 50000, 5000, 500, 50, 5, 1];
+           } // determine a user-friendly endpoint for the scale
 
-           return function(selection) {
-               var img = selection
-                   .append('img')
-                   .attr('src', context.imagePath('loader-black.gif'))
-                   .style('opacity', 0);
 
-               if (osm) {
-                   osm
-                       .on('loading.spinner', function() {
-                           img.transition()
-                               .style('opacity', 1);
-                       })
-                       .on('loaded.spinner', function() {
-                           img.transition()
-                               .style('opacity', 0);
-                       });
-               }
-           };
-       }
+           for (i = 0; i < buckets.length; i++) {
+             val = buckets[i];
 
-       function uiSplash(context) {
-         return (selection) => {
-           // Exception - if there are restorable changes, skip this splash screen.
-           // This is because we currently only support one `uiModal` at a time
-           //  and we need to show them `uiRestore`` instead of this one.
-           if (context.history().hasRestorableChanges()) return;
+             if (dist >= val) {
+               scale.dist = Math.floor(dist / val) * val;
+               break;
+             } else {
+               scale.dist = +dist.toFixed(2);
+             }
+           }
 
-           // If user has not seen this version of the privacy policy, show the splash again.
-           let updateMessage = '';
-           const sawPrivacyVersion = corePreferences('sawPrivacyVersion');
-           let showSplash = !corePreferences('sawSplash');
-           if (sawPrivacyVersion !== context.privacyVersion) {
-             updateMessage = _t('splash.privacy_update');
-             showSplash = true;
+           dLon = geoMetersToLon(scale.dist / conversion, lat);
+           scale.px = Math.round(projection([loc1[0] + dLon, loc1[1]])[0]);
+           scale.text = displayLength(scale.dist / conversion, isImperial);
+           return scale;
+         }
+
+         function update(selection) {
+           // choose loc1, loc2 along bottom of viewport (near where the scale will be drawn)
+           var dims = context.map().dimensions(),
+               loc1 = projection.invert([0, dims[1]]),
+               loc2 = projection.invert([maxLength, dims[1]]),
+               scale = scaleDefs(loc1, loc2);
+           selection.select('.scale-path').attr('d', 'M0.5,0.5v' + tickHeight + 'h' + scale.px + 'v-' + tickHeight);
+           selection.select('.scale-text').style(_mainLocalizer.textDirection() === 'ltr' ? 'left' : 'right', scale.px + 16 + 'px').html(scale.text);
+         }
+
+         return function (selection) {
+           function switchUnits() {
+             isImperial = !isImperial;
+             selection.call(update);
            }
 
-           if (!showSplash) return;
+           var scalegroup = selection.append('svg').attr('class', 'scale').on('click', switchUnits).append('g').attr('transform', 'translate(10,11)');
+           scalegroup.append('path').attr('class', 'scale-path');
+           selection.append('div').attr('class', 'scale-text');
+           selection.call(update);
+           context.map().on('move.scale', function () {
+             update(selection);
+           });
+         };
+       }
 
-           corePreferences('sawSplash', true);
-           corePreferences('sawPrivacyVersion', context.privacyVersion);
+       function uiShortcuts(context) {
+         var detected = utilDetect();
+         var _activeTab = 0;
 
-           // fetch intro graph data now, while user is looking at the splash screen
-           _mainFileFetcher.get('intro_graph');
+         var _modalSelection;
 
-           let modalSelection = uiModal(selection);
+         var _selection = select(null);
 
-           modalSelection.select('.modal')
-             .attr('class', 'modal-splash modal');
+         function shortcutsModal(_modalSelection) {
+           _modalSelection.select('.modal').classed('modal-shortcuts', true);
 
-           let introModal = modalSelection.select('.content')
-             .append('div')
-             .attr('class', 'fillL');
+           var content = _modalSelection.select('.content');
 
-           introModal
-             .append('div')
-             .attr('class','modal-section')
-             .append('h3')
-             .text(_t('splash.welcome'));
+           content.append('div').attr('class', 'modal-section').append('h3').html(_t.html('shortcuts.title'));
+           _mainFileFetcher.get('shortcuts').then(function (data) {
+             content.call(render, data);
+           })["catch"](function () {
+             /* ignore */
+           });
+         }
 
-           let modalSection = introModal
-             .append('div')
-             .attr('class','modal-section');
+         function render(selection, dataShortcuts) {
+           var wrapper = selection.selectAll('.wrapper').data([0]);
+           var wrapperEnter = wrapper.enter().append('div').attr('class', 'wrapper modal-section');
+           var tabsBar = wrapperEnter.append('div').attr('class', 'tabs-bar');
+           var shortcutsList = wrapperEnter.append('div').attr('class', 'shortcuts-list');
+           wrapper = wrapper.merge(wrapperEnter);
+           var tabs = tabsBar.selectAll('.tab').data(dataShortcuts);
+           var tabsEnter = tabs.enter().append('a').attr('class', 'tab').attr('href', '#').on('click', function (d3_event) {
+             d3_event.preventDefault();
+             var i = tabs.nodes().indexOf(this);
+             _activeTab = i;
+             render(selection, dataShortcuts);
+           });
+           tabsEnter.append('span').html(function (d) {
+             return _t.html(d.text);
+           }); // Update
 
-           modalSection
-             .append('p')
-             .html(_t('splash.text', {
-               version: context.version,
-               website: '<a target="_blank" href="http://ideditor.blog/">ideditor.blog</a>',
-               github: '<a target="_blank" href="https://github.com/openstreetmap/iD">github.com</a>'
-             }));
+           wrapper.selectAll('.tab').classed('active', function (d, i) {
+             return i === _activeTab;
+           });
+           var shortcuts = shortcutsList.selectAll('.shortcut-tab').data(dataShortcuts);
+           var shortcutsEnter = shortcuts.enter().append('div').attr('class', function (d) {
+             return 'shortcut-tab shortcut-tab-' + d.tab;
+           });
+           var columnsEnter = shortcutsEnter.selectAll('.shortcut-column').data(function (d) {
+             return d.columns;
+           }).enter().append('table').attr('class', 'shortcut-column');
+           var rowsEnter = columnsEnter.selectAll('.shortcut-row').data(function (d) {
+             return d.rows;
+           }).enter().append('tr').attr('class', 'shortcut-row');
+           var sectionRows = rowsEnter.filter(function (d) {
+             return !d.shortcuts;
+           });
+           sectionRows.append('td');
+           sectionRows.append('td').attr('class', 'shortcut-section').append('h3').html(function (d) {
+             return _t.html(d.text);
+           });
+           var shortcutRows = rowsEnter.filter(function (d) {
+             return d.shortcuts;
+           });
+           var shortcutKeys = shortcutRows.append('td').attr('class', 'shortcut-keys');
+           var modifierKeys = shortcutKeys.filter(function (d) {
+             return d.modifiers;
+           });
+           modifierKeys.selectAll('kbd.modifier').data(function (d) {
+             if (detected.os === 'win' && d.text === 'shortcuts.editing.commands.redo') {
+               return ['⌘'];
+             } else if (detected.os !== 'mac' && d.text === 'shortcuts.browsing.display_options.fullscreen') {
+               return [];
+             } else {
+               return d.modifiers;
+             }
+           }).enter().each(function () {
+             var selection = select(this);
+             selection.append('kbd').attr('class', 'modifier').html(function (d) {
+               return uiCmd.display(d);
+             });
+             selection.append('span').html('+');
+           });
+           shortcutKeys.selectAll('kbd.shortcut').data(function (d) {
+             var arr = d.shortcuts;
 
-           modalSection
-             .append('p')
-             .html(_t('splash.privacy', {
-               updateMessage: updateMessage,
-               privacyLink: '<a target="_blank" href="https://github.com/openstreetmap/iD/blob/release/PRIVACY.md">' +
-                 _t('splash.privacy_policy') + '</a>'
-             }));
+             if (detected.os === 'win' && d.text === 'shortcuts.editing.commands.redo') {
+               arr = ['Y'];
+             } else if (detected.os !== 'mac' && d.text === 'shortcuts.browsing.display_options.fullscreen') {
+               arr = ['F11'];
+             } // replace translations
 
-           let buttonWrap = introModal
-             .append('div')
-             .attr('class', 'modal-actions');
 
-           let walkthrough = buttonWrap
-             .append('button')
-             .attr('class', 'walkthrough')
-             .on('click', () => {
-               context.container().call(uiIntro(context));
-               modalSelection.close();
+             arr = arr.map(function (s) {
+               return uiCmd.display(s.indexOf('.') !== -1 ? _t(s) : s);
+             });
+             return utilArrayUniq(arr).map(function (s) {
+               return {
+                 shortcut: s,
+                 separator: d.separator,
+                 suffix: d.suffix
+               };
+             });
+           }).enter().each(function (d, i, nodes) {
+             var selection = select(this);
+             var click = d.shortcut.toLowerCase().match(/(.*).click/);
+
+             if (click && click[1]) {
+               // replace "left_click", "right_click" with mouse icon
+               selection.call(svgIcon('#iD-walkthrough-mouse-' + click[1], 'operation'));
+             } else if (d.shortcut.toLowerCase() === 'long-press') {
+               selection.call(svgIcon('#iD-walkthrough-longpress', 'longpress operation'));
+             } else if (d.shortcut.toLowerCase() === 'tap') {
+               selection.call(svgIcon('#iD-walkthrough-tap', 'tap operation'));
+             } else {
+               selection.append('kbd').attr('class', 'shortcut').html(function (d) {
+                 return d.shortcut;
+               });
+             }
+
+             if (i < nodes.length - 1) {
+               selection.append('span').html(d.separator || "\xA0" + _t.html('shortcuts.or') + "\xA0");
+             } else if (i === nodes.length - 1 && d.suffix) {
+               selection.append('span').html(d.suffix);
+             }
+           });
+           shortcutKeys.filter(function (d) {
+             return d.gesture;
+           }).each(function () {
+             var selection = select(this);
+             selection.append('span').html('+');
+             selection.append('span').attr('class', 'gesture').html(function (d) {
+               return _t.html(d.gesture);
              });
+           });
+           shortcutRows.append('td').attr('class', 'shortcut-desc').html(function (d) {
+             return d.text ? _t.html(d.text) : "\xA0";
+           }); // Update
 
-           walkthrough
-             .append('svg')
-             .attr('class', 'logo logo-walkthrough')
-             .append('use')
-             .attr('xlink:href', '#iD-logo-walkthrough');
+           wrapper.selectAll('.shortcut-tab').style('display', function (d, i) {
+             return i === _activeTab ? 'flex' : 'none';
+           });
+         }
 
-           walkthrough
-             .append('div')
-             .text(_t('splash.walkthrough'));
+         return function (selection, show) {
+           _selection = selection;
 
-           let startEditing = buttonWrap
-             .append('button')
-             .attr('class', 'start-editing')
-             .on('click', modalSelection.close);
+           if (show) {
+             _modalSelection = uiModal(selection);
 
-           startEditing
-             .append('svg')
-             .attr('class', 'logo logo-features')
-             .append('use')
-             .attr('xlink:href', '#iD-logo-features');
+             _modalSelection.call(shortcutsModal);
+           } else {
+             context.keybinding().on([_t('shortcuts.toggle.key'), '?'], function () {
+               if (context.container().selectAll('.modal-shortcuts').size()) {
+                 // already showing
+                 if (_modalSelection) {
+                   _modalSelection.close();
 
-           startEditing
-             .append('div')
-             .text(_t('splash.start'));
+                   _modalSelection = null;
+                 }
+               } else {
+                 _modalSelection = uiModal(_selection);
 
-           modalSelection.select('button.close')
-             .attr('class','hide');
+                 _modalSelection.call(shortcutsModal);
+               }
+             });
+           }
          };
        }
 
-       function uiStatus(context) {
-           var osm = context.connection();
+       var pair_1 = pair;
 
+       function search(input, dims) {
+         if (!dims) dims = 'NSEW';
+         if (typeof input !== 'string') return null;
+         input = input.toUpperCase();
+         var regex = /^[\s\,]*([NSEW])?\s*([\-|\—|\―]?[0-9.]+)[°º˚]?\s*(?:([0-9.]+)['’′‘]\s*)?(?:([0-9.]+)(?:''|"|”|″)\s*)?([NSEW])?/;
+         var m = input.match(regex);
+         if (!m) return null; // no match
 
-           return function(selection) {
-               if (!osm) return;
+         var matched = m[0]; // extract dimension.. m[1] = leading, m[5] = trailing
 
-               function update(err, apiStatus) {
-                   selection.html('');
+         var dim;
 
-                   if (err) {
-                       if (apiStatus === 'connectionSwitched') {
-                           // if the connection was just switched, we can't rely on
-                           // the status (we're getting the status of the previous api)
-                           return;
+         if (m[1] && m[5]) {
+           // if matched both..
+           dim = m[1]; // keep leading
 
-                       } else if (apiStatus === 'rateLimited') {
-                           selection
-                               .text(_t('osm_api_status.message.rateLimit'))
-                               .append('a')
-                               .attr('class', 'api-status-login')
-                               .attr('target', '_blank')
-                               .call(svgIcon('#iD-icon-out-link', 'inline'))
-                               .append('span')
-                               .text(_t('login'))
-                               .on('click.login', function() {
-                                   event.preventDefault();
-                                   osm.authenticate();
-                               });
-                       } else {
-
-                           // don't allow retrying too rapidly
-                           var throttledRetry = throttle(function() {
-                               // try loading the visible tiles
-                               context.loadTiles(context.projection);
-                               // manually reload the status too in case all visible tiles were already loaded
-                               osm.reloadApiStatus();
-                           }, 2000);
-
-                           // eslint-disable-next-line no-warning-comments
-                           // TODO: nice messages for different error types
-                           selection
-                               .text(_t('osm_api_status.message.error') + ' ')
-                               .append('a')
-                               // let the user manually retry their connection directly
-                               .text(_t('osm_api_status.retry'))
-                               .on('click.retry', function() {
-                                   event.preventDefault();
-                                   throttledRetry();
-                               });
-                       }
+           matched = matched.slice(0, -1); // remove trailing dimension from match
+         } else {
+           dim = m[1] || m[5];
+         } // if unrecognized dimension
 
-                   } else if (apiStatus === 'readonly') {
-                       selection.text(_t('osm_api_status.message.readonly'));
-                   } else if (apiStatus === 'offline') {
-                       selection.text(_t('osm_api_status.message.offline'));
-                   }
 
-                   selection.attr('class', 'api-status ' + (err ? 'error' : apiStatus));
-               }
+         if (dim && dims.indexOf(dim) === -1) return null; // extract DMS
 
-               osm.on('apiStatusChange.uiStatus', update);
+         var deg = m[2] ? parseFloat(m[2]) : 0;
+         var min = m[3] ? parseFloat(m[3]) / 60 : 0;
+         var sec = m[4] ? parseFloat(m[4]) / 3600 : 0;
+         var sign = deg < 0 ? -1 : 1;
+         if (dim === 'S' || dim === 'W') sign *= -1;
+         return {
+           val: (Math.abs(deg) + min + sec) * sign,
+           dim: dim,
+           matched: matched,
+           remain: input.slice(matched.length)
+         };
+       }
 
-               // reload the status periodically regardless of other factors
-               window.setInterval(function() {
-                   osm.reloadApiStatus();
-               }, 90000);
+       function pair(input, dims) {
+         input = input.trim();
+         var one = search(input, dims);
+         if (!one) return null;
+         input = one.remain.trim();
+         var two = search(input, dims);
+         if (!two || two.remain) return null;
 
-               // load the initial status in case no OSM data was loaded yet
-               osm.reloadApiStatus();
-           };
+         if (one.dim) {
+           return swapdim(one.val, two.val, one.dim);
+         } else {
+           return [one.val, two.val];
+         }
        }
 
-       function modeDrawArea(context, wayID, startGraph, button) {
-           var mode = {
-               button: button,
-               id: 'draw-area'
-           };
+       function swapdim(a, b, dim) {
+         if (dim === 'N' || dim === 'S') return [a, b];
+         if (dim === 'W' || dim === 'E') return [b, a];
+       }
 
-           var behavior = behaviorDrawWay(context, wayID, mode, startGraph)
-               .on('rejectedSelfIntersection.modeDrawArea', function() {
-                   context.ui().flash
-                       .text(_t('self_intersection.error.areas'))();
-               });
+       function uiFeatureList(context) {
+         var _geocodeResults;
 
-           mode.wayID = wayID;
+         function featureList(selection) {
+           var header = selection.append('div').attr('class', 'header fillL');
+           header.append('h3').html(_t.html('inspector.feature_list'));
+           var searchWrap = selection.append('div').attr('class', 'search-header');
+           searchWrap.call(svgIcon('#iD-icon-search', 'pre-text'));
+           var search = searchWrap.append('input').attr('placeholder', _t('inspector.search')).attr('type', 'search').call(utilNoAuto).on('keypress', keypress).on('keydown', keydown).on('input', inputevent);
+           var listWrap = selection.append('div').attr('class', 'inspector-body');
+           var list = listWrap.append('div').attr('class', 'feature-list');
+           context.on('exit.feature-list', clearSearch);
+           context.map().on('drawn.feature-list', mapDrawn);
+           context.keybinding().on(uiCmd('⌘F'), focusSearch);
 
-           mode.enter = function() {
-               context.install(behavior);
-           };
+           function focusSearch(d3_event) {
+             var mode = context.mode() && context.mode().id;
+             if (mode !== 'browse') return;
+             d3_event.preventDefault();
+             search.node().focus();
+           }
 
-           mode.exit = function() {
-               context.uninstall(behavior);
-           };
+           function keydown(d3_event) {
+             if (d3_event.keyCode === 27) {
+               // escape
+               search.node().blur();
+             }
+           }
 
-           mode.selectedIDs = function() {
-               return [wayID];
-           };
+           function keypress(d3_event) {
+             var q = search.property('value'),
+                 items = list.selectAll('.feature-list-item');
 
-           mode.activeID = function() {
-               return (behavior && behavior.activeID()) || [];
-           };
+             if (d3_event.keyCode === 13 && // ↩ Return
+             q.length && items.size()) {
+               click(items.datum());
+             }
+           }
 
-           return mode;
-       }
+           function inputevent() {
+             _geocodeResults = undefined;
+             drawList();
+           }
 
-       function modeAddArea(context, mode) {
-           mode.id = 'add-area';
+           function clearSearch() {
+             search.property('value', '');
+             drawList();
+           }
 
-           var behavior = behaviorAddWay(context)
-               .on('start', start)
-               .on('startFromWay', startFromWay)
-               .on('startFromNode', startFromNode);
+           function mapDrawn(e) {
+             if (e.full) {
+               drawList();
+             }
+           }
 
-           var defaultTags = { area: 'yes' };
-           if (mode.preset) defaultTags = mode.preset.setTags(defaultTags, 'area');
+           function features() {
+             var result = [];
+             var graph = context.graph();
+             var visibleCenter = context.map().extent().center();
+             var q = search.property('value').toLowerCase();
+             if (!q) return result;
+             var locationMatch = pair_1(q.toUpperCase()) || q.match(/^(-?\d+\.?\d*)\s+(-?\d+\.?\d*)$/);
+
+             if (locationMatch) {
+               var loc = [parseFloat(locationMatch[0]), parseFloat(locationMatch[1])];
+               result.push({
+                 id: -1,
+                 geometry: 'point',
+                 type: _t('inspector.location'),
+                 name: dmsCoordinatePair([loc[1], loc[0]]),
+                 location: loc
+               });
+             } // A location search takes priority over an ID search
 
 
-           function actionClose(wayId) {
-               return function (graph) {
-                   return graph.replace(graph.entity(wayId).close());
-               };
-           }
+             var idMatch = !locationMatch && q.match(/(?:^|\W)(node|way|relation|[nwr])\W?0*([1-9]\d*)(?:\W|$)/i);
 
+             if (idMatch) {
+               var elemType = idMatch[1].charAt(0);
+               var elemId = idMatch[2];
+               result.push({
+                 id: elemType + elemId,
+                 geometry: elemType === 'n' ? 'point' : elemType === 'w' ? 'line' : 'relation',
+                 type: elemType === 'n' ? _t('inspector.node') : elemType === 'w' ? _t('inspector.way') : _t('inspector.relation'),
+                 name: elemId
+               });
+             }
 
-           function start(loc) {
-               var startGraph = context.graph();
-               var node = osmNode({ loc: loc });
-               var way = osmWay({ tags: defaultTags });
+             var allEntities = graph.entities;
+             var localResults = [];
 
-               context.perform(
-                   actionAddEntity(node),
-                   actionAddEntity(way),
-                   actionAddVertex(way.id, node.id),
-                   actionClose(way.id)
-               );
+             for (var id in allEntities) {
+               var entity = allEntities[id];
+               if (!entity) continue;
+               var name = utilDisplayName(entity) || '';
+               if (name.toLowerCase().indexOf(q) < 0) continue;
+               var matched = _mainPresetIndex.match(entity, graph);
+               var type = matched && matched.name() || utilDisplayType(entity.id);
+               var extent = entity.extent(graph);
+               var distance = extent ? geoSphericalDistance(visibleCenter, extent.center()) : 0;
+               localResults.push({
+                 id: entity.id,
+                 entity: entity,
+                 geometry: entity.geometry(graph),
+                 type: type,
+                 name: name,
+                 distance: distance
+               });
+               if (localResults.length > 100) break;
+             }
 
-               context.enter(modeDrawArea(context, way.id, startGraph, mode.button));
-           }
+             localResults = localResults.sort(function byDistance(a, b) {
+               return a.distance - b.distance;
+             });
+             result = result.concat(localResults);
+
+             (_geocodeResults || []).forEach(function (d) {
+               if (d.osm_type && d.osm_id) {
+                 // some results may be missing these - #1890
+                 // Make a temporary osmEntity so we can preset match
+                 // and better localize the search result - #4725
+                 var id = osmEntity.id.fromOSM(d.osm_type, d.osm_id);
+                 var tags = {};
+                 tags[d["class"]] = d.type;
+                 var attrs = {
+                   id: id,
+                   type: d.osm_type,
+                   tags: tags
+                 };
 
+                 if (d.osm_type === 'way') {
+                   // for ways, add some fake closed nodes
+                   attrs.nodes = ['a', 'a']; // so that geometry area is possible
+                 }
 
-           function startFromWay(loc, edge) {
-               var startGraph = context.graph();
-               var node = osmNode({ loc: loc });
-               var way = osmWay({ tags: defaultTags });
+                 var tempEntity = osmEntity(attrs);
+                 var tempGraph = coreGraph([tempEntity]);
+                 var matched = _mainPresetIndex.match(tempEntity, tempGraph);
+                 var type = matched && matched.name() || utilDisplayType(id);
+                 result.push({
+                   id: tempEntity.id,
+                   geometry: tempEntity.geometry(tempGraph),
+                   type: type,
+                   name: d.display_name,
+                   extent: new geoExtent([parseFloat(d.boundingbox[3]), parseFloat(d.boundingbox[0])], [parseFloat(d.boundingbox[2]), parseFloat(d.boundingbox[1])])
+                 });
+               }
+             });
 
-               context.perform(
-                   actionAddEntity(node),
-                   actionAddEntity(way),
-                   actionAddVertex(way.id, node.id),
-                   actionClose(way.id),
-                   actionAddMidpoint({ loc: loc, edge: edge }, node)
-               );
+             if (q.match(/^[0-9]+$/)) {
+               // if query is just a number, possibly an OSM ID without a prefix
+               result.push({
+                 id: 'n' + q,
+                 geometry: 'point',
+                 type: _t('inspector.node'),
+                 name: q
+               });
+               result.push({
+                 id: 'w' + q,
+                 geometry: 'line',
+                 type: _t('inspector.way'),
+                 name: q
+               });
+               result.push({
+                 id: 'r' + q,
+                 geometry: 'relation',
+                 type: _t('inspector.relation'),
+                 name: q
+               });
+             }
 
-               context.enter(modeDrawArea(context, way.id, startGraph, mode.button));
+             return result;
            }
 
+           function drawList() {
+             var value = search.property('value');
+             var results = features();
+             list.classed('filtered', value.length);
+             var resultsIndicator = list.selectAll('.no-results-item').data([0]).enter().append('button').property('disabled', true).attr('class', 'no-results-item').call(svgIcon('#iD-icon-alert', 'pre-text'));
+             resultsIndicator.append('span').attr('class', 'entity-name');
+             list.selectAll('.no-results-item .entity-name').html(_t.html('geocoder.no_results_worldwide'));
 
-           function startFromNode(node) {
-               var startGraph = context.graph();
-               var way = osmWay({ tags: defaultTags });
-
-               context.perform(
-                   actionAddEntity(way),
-                   actionAddVertex(way.id, node.id),
-                   actionClose(way.id)
-               );
+             if (services.geocoder) {
+               list.selectAll('.geocode-item').data([0]).enter().append('button').attr('class', 'geocode-item secondary-action').on('click', geocoderSearch).append('div').attr('class', 'label').append('span').attr('class', 'entity-name').html(_t.html('geocoder.search'));
+             }
 
-               context.enter(modeDrawArea(context, way.id, startGraph, mode.button));
+             list.selectAll('.no-results-item').style('display', value.length && !results.length ? 'block' : 'none');
+             list.selectAll('.geocode-item').style('display', value && _geocodeResults === undefined ? 'block' : 'none');
+             list.selectAll('.feature-list-item').data([-1]).remove();
+             var items = list.selectAll('.feature-list-item').data(results, function (d) {
+               return d.id;
+             });
+             var enter = items.enter().insert('button', '.geocode-item').attr('class', 'feature-list-item').on('mouseover', mouseover).on('mouseout', mouseout).on('click', click);
+             var label = enter.append('div').attr('class', 'label');
+             label.each(function (d) {
+               select(this).call(svgIcon('#iD-icon-' + d.geometry, 'pre-text'));
+             });
+             label.append('span').attr('class', 'entity-type').html(function (d) {
+               return d.type;
+             });
+             label.append('span').attr('class', 'entity-name').html(function (d) {
+               return d.name;
+             });
+             enter.style('opacity', 0).transition().style('opacity', 1);
+             items.order();
+             items.exit().remove();
            }
 
+           function mouseover(d3_event, d) {
+             if (d.id === -1) return;
+             utilHighlightEntities([d.id], true, context);
+           }
 
-           mode.enter = function() {
-               context.install(behavior);
-           };
+           function mouseout(d3_event, d) {
+             if (d.id === -1) return;
+             utilHighlightEntities([d.id], false, context);
+           }
 
+           function click(d3_event, d) {
+             d3_event.preventDefault();
 
-           mode.exit = function() {
-               context.uninstall(behavior);
-           };
+             if (d.location) {
+               context.map().centerZoomEase([d.location[1], d.location[0]], 19);
+             } else if (d.entity) {
+               utilHighlightEntities([d.id], false, context);
+               context.enter(modeSelect(context, [d.entity.id]));
+               context.map().zoomToEase(d.entity);
+             } else {
+               // download, zoom to, and select the entity with the given ID
+               context.zoomToEntity(d.id);
+             }
+           }
 
+           function geocoderSearch() {
+             services.geocoder.search(search.property('value'), function (err, resp) {
+               _geocodeResults = resp || [];
+               drawList();
+             });
+           }
+         }
 
-           return mode;
+         return featureList;
        }
 
-       function modeAddLine(context, mode) {
-           mode.id = 'add-line';
-
-           var behavior = behaviorAddWay(context)
-               .on('start', start)
-               .on('startFromWay', startFromWay)
-               .on('startFromNode', startFromNode);
-
-           var defaultTags = {};
-           if (mode.preset) defaultTags = mode.preset.setTags(defaultTags, 'line');
+       function uiSectionEntityIssues(context) {
+         var _entityIDs = [];
+         var _issues = [];
 
+         var _activeIssueID;
 
-           function start(loc) {
-               var startGraph = context.graph();
-               var node = osmNode({ loc: loc });
-               var way = osmWay({ tags: defaultTags });
+         var section = uiSection('entity-issues', context).shouldDisplay(function () {
+           return _issues.length > 0;
+         }).label(function () {
+           return _t('inspector.title_count', {
+             title: _t.html('issues.list_title'),
+             count: _issues.length
+           });
+         }).disclosureContent(renderDisclosureContent);
+         context.validator().on('validated.entity_issues', function () {
+           // Refresh on validated events
+           reloadIssues();
+           section.reRender();
+         }).on('focusedIssue.entity_issues', function (issue) {
+           makeActiveIssue(issue.id);
+         });
 
-               context.perform(
-                   actionAddEntity(node),
-                   actionAddEntity(way),
-                   actionAddVertex(way.id, node.id)
-               );
+         function reloadIssues() {
+           _issues = context.validator().getSharedEntityIssues(_entityIDs, {
+             includeDisabledRules: true
+           });
+         }
 
-               context.enter(modeDrawLine(context, way.id, startGraph, mode.button));
-           }
+         function makeActiveIssue(issueID) {
+           _activeIssueID = issueID;
+           section.selection().selectAll('.issue-container').classed('active', function (d) {
+             return d.id === _activeIssueID;
+           });
+         }
 
+         function renderDisclosureContent(selection) {
+           selection.classed('grouped-items-area', true);
+           _activeIssueID = _issues.length > 0 ? _issues[0].id : null;
+           var containers = selection.selectAll('.issue-container').data(_issues, function (d) {
+             return d.id;
+           }); // Exit
 
-           function startFromWay(loc, edge) {
-               var startGraph = context.graph();
-               var node = osmNode({ loc: loc });
-               var way = osmWay({ tags: defaultTags });
+           containers.exit().remove(); // Enter
 
-               context.perform(
-                   actionAddEntity(node),
-                   actionAddEntity(way),
-                   actionAddVertex(way.id, node.id),
-                   actionAddMidpoint({ loc: loc, edge: edge }, node)
-               );
+           var containersEnter = containers.enter().append('div').attr('class', 'issue-container');
+           var itemsEnter = containersEnter.append('div').attr('class', function (d) {
+             return 'issue severity-' + d.severity;
+           }).on('mouseover.highlight', function (d3_event, d) {
+             // don't hover-highlight the selected entity
+             var ids = d.entityIds.filter(function (e) {
+               return _entityIDs.indexOf(e) === -1;
+             });
+             utilHighlightEntities(ids, true, context);
+           }).on('mouseout.highlight', function (d3_event, d) {
+             var ids = d.entityIds.filter(function (e) {
+               return _entityIDs.indexOf(e) === -1;
+             });
+             utilHighlightEntities(ids, false, context);
+           });
+           var labelsEnter = itemsEnter.append('div').attr('class', 'issue-label');
+           var textEnter = labelsEnter.append('button').attr('class', 'issue-text').on('click', function (d3_event, d) {
+             makeActiveIssue(d.id); // expand only the clicked item
 
-               context.enter(modeDrawLine(context, way.id, startGraph, mode.button));
-           }
+             var extent = d.extent(context.graph());
 
+             if (extent) {
+               var setZoom = Math.max(context.map().zoom(), 19);
+               context.map().unobscuredCenterZoomEase(extent.center(), setZoom);
+             }
+           });
+           textEnter.each(function (d) {
+             var iconName = '#iD-icon-' + (d.severity === 'warning' ? 'alert' : 'error');
+             select(this).call(svgIcon(iconName, 'issue-icon'));
+           });
+           textEnter.append('span').attr('class', 'issue-message');
+           var infoButton = labelsEnter.append('button').attr('class', 'issue-info-button').attr('title', _t('icons.information')).call(svgIcon('#iD-icon-inspect'));
+           infoButton.on('click', function (d3_event) {
+             d3_event.stopPropagation();
+             d3_event.preventDefault();
+             this.blur(); // avoid keeping focus on the button - #4641
+
+             var container = select(this.parentNode.parentNode.parentNode);
+             var info = container.selectAll('.issue-info');
+             var isExpanded = info.classed('expanded');
+
+             if (isExpanded) {
+               info.transition().duration(200).style('max-height', '0px').style('opacity', '0').on('end', function () {
+                 info.classed('expanded', false);
+               });
+             } else {
+               info.classed('expanded', true).transition().duration(200).style('max-height', '200px').style('opacity', '1').on('end', function () {
+                 info.style('max-height', null);
+               });
+             }
+           });
+           itemsEnter.append('ul').attr('class', 'issue-fix-list');
+           containersEnter.append('div').attr('class', 'issue-info').style('max-height', '0').style('opacity', '0').each(function (d) {
+             if (typeof d.reference === 'function') {
+               select(this).call(d.reference);
+             } else {
+               select(this).html(_t.html('inspector.no_documentation_key'));
+             }
+           }); // Update
 
-           function startFromNode(node) {
-               var startGraph = context.graph();
-               var way = osmWay({ tags: defaultTags });
+           containers = containers.merge(containersEnter).classed('active', function (d) {
+             return d.id === _activeIssueID;
+           });
+           containers.selectAll('.issue-message').html(function (d) {
+             return d.message(context);
+           }); // fixes
+
+           var fixLists = containers.selectAll('.issue-fix-list');
+           var fixes = fixLists.selectAll('.issue-fix-item').data(function (d) {
+             return d.fixes ? d.fixes(context) : [];
+           }, function (fix) {
+             return fix.id;
+           });
+           fixes.exit().remove();
+           var fixesEnter = fixes.enter().append('li').attr('class', 'issue-fix-item');
+           var buttons = fixesEnter.append('button').on('click', function (d3_event, d) {
+             // not all fixes are actionable
+             if (select(this).attr('disabled') || !d.onClick) return; // Don't run another fix for this issue within a second of running one
+             // (Necessary for "Select a feature type" fix. Most fixes should only ever run once)
+
+             if (d.issue.dateLastRanFix && new Date() - d.issue.dateLastRanFix < 1000) return;
+             d.issue.dateLastRanFix = new Date(); // remove hover-highlighting
+
+             utilHighlightEntities(d.issue.entityIds.concat(d.entityIds), false, context);
+             new Promise(function (resolve, reject) {
+               d.onClick(context, resolve, reject);
+
+               if (d.onClick.length <= 1) {
+                 // if the fix doesn't take any completion parameters then consider it resolved
+                 resolve();
+               }
+             }).then(function () {
+               // revalidate whenever the fix has finished running successfully
+               context.validator().validate();
+             });
+           }).on('mouseover.highlight', function (d3_event, d) {
+             utilHighlightEntities(d.entityIds, true, context);
+           }).on('mouseout.highlight', function (d3_event, d) {
+             utilHighlightEntities(d.entityIds, false, context);
+           });
+           buttons.each(function (d) {
+             var iconName = d.icon || 'iD-icon-wrench';
 
-               context.perform(
-                   actionAddEntity(way),
-                   actionAddVertex(way.id, node.id)
-               );
+             if (iconName.startsWith('maki')) {
+               iconName += '-15';
+             }
 
-               context.enter(modeDrawLine(context, way.id, startGraph, mode.button));
-           }
+             select(this).call(svgIcon('#' + iconName, 'fix-icon'));
+           });
+           buttons.append('span').attr('class', 'fix-message').html(function (d) {
+             return d.title;
+           });
+           fixesEnter.merge(fixes).selectAll('button').classed('actionable', function (d) {
+             return d.onClick;
+           }).attr('disabled', function (d) {
+             return d.onClick ? null : 'true';
+           }).attr('title', function (d) {
+             if (d.disabledReason) {
+               return d.disabledReason;
+             }
 
+             return null;
+           });
+         }
 
-           mode.enter = function() {
-               context.install(behavior);
-           };
+         section.entityIDs = function (val) {
+           if (!arguments.length) return _entityIDs;
 
+           if (!_entityIDs || !val || !utilArrayIdentical(_entityIDs, val)) {
+             _entityIDs = val;
+             _activeIssueID = null;
+             reloadIssues();
+           }
 
-           mode.exit = function() {
-               context.uninstall(behavior);
-           };
+           return section;
+         };
 
-           return mode;
+         return section;
        }
 
-       function modeAddPoint(context, mode) {
+       function uiPresetIcon() {
+         var _preset;
 
-           mode.id = 'add-point';
+         var _geometry;
 
-           var behavior = behaviorDraw(context)
-               .on('click', add)
-               .on('clickWay', addWay)
-               .on('clickNode', addNode)
-               .on('cancel', cancel)
-               .on('finish', cancel);
+         var _sizeClass = 'medium';
 
-           var defaultTags = {};
-           if (mode.preset) defaultTags = mode.preset.setTags(defaultTags, 'point');
+         function isSmall() {
+           return _sizeClass === 'small';
+         }
 
+         function presetIcon(selection) {
+           selection.each(render);
+         }
 
-           function add(loc) {
-               var node = osmNode({ loc: loc, tags: defaultTags });
+         function getIcon(p, geom) {
+           if (isSmall() && p.isFallback && p.isFallback()) return 'iD-icon-' + p.id;else if (p.icon) return p.icon;else if (geom === 'line') return 'iD-other-line';else if (geom === 'vertex') return p.isFallback() ? '' : 'temaki-vertex';else if (isSmall() && geom === 'point') return '';else return 'maki-marker-stroked';
+         }
 
-               context.perform(
-                   actionAddEntity(node),
-                   _t('operations.add.annotation.point')
-               );
+         function renderPointBorder(container, drawPoint) {
+           var pointBorder = container.selectAll('.preset-icon-point-border').data(drawPoint ? [0] : []);
+           pointBorder.exit().remove();
+           var pointBorderEnter = pointBorder.enter();
+           var w = 40;
+           var h = 40;
+           pointBorderEnter.append('svg').attr('class', 'preset-icon-fill preset-icon-point-border').attr('width', w).attr('height', h).attr('viewBox', "0 0 ".concat(w, " ").concat(h)).append('path').attr('transform', 'translate(11.5, 8)').attr('d', 'M 17,8 C 17,13 11,21 8.5,23.5 C 6,21 0,13 0,8 C 0,4 4,-0.5 8.5,-0.5 C 13,-0.5 17,4 17,8 z');
+           pointBorder = pointBorderEnter.merge(pointBorder);
+         }
 
-               enterSelectMode(node);
-           }
+         function renderCircleFill(container, drawVertex) {
+           var vertexFill = container.selectAll('.preset-icon-fill-vertex').data(drawVertex ? [0] : []);
+           vertexFill.exit().remove();
+           var vertexFillEnter = vertexFill.enter();
+           var w = 60;
+           var h = 60;
+           var d = 40;
+           vertexFillEnter.append('svg').attr('class', 'preset-icon-fill preset-icon-fill-vertex').attr('width', w).attr('height', h).attr('viewBox', "0 0 ".concat(w, " ").concat(h)).append('circle').attr('cx', w / 2).attr('cy', h / 2).attr('r', d / 2);
+           vertexFill = vertexFillEnter.merge(vertexFill);
+         }
 
+         function renderSquareFill(container, drawArea, tagClasses) {
+           var fill = container.selectAll('.preset-icon-fill-area').data(drawArea ? [0] : []);
+           fill.exit().remove();
+           var fillEnter = fill.enter();
+           var d = isSmall() ? 40 : 60;
+           var w = d;
+           var h = d;
+           var l = d * 2 / 3;
+           var c1 = (w - l) / 2;
+           var c2 = c1 + l;
+           fillEnter = fillEnter.append('svg').attr('class', 'preset-icon-fill preset-icon-fill-area').attr('width', w).attr('height', h).attr('viewBox', "0 0 ".concat(w, " ").concat(h));
+           ['fill', 'stroke'].forEach(function (klass) {
+             fillEnter.append('path').attr('d', "M".concat(c1, " ").concat(c1, " L").concat(c1, " ").concat(c2, " L").concat(c2, " ").concat(c2, " L").concat(c2, " ").concat(c1, " Z")).attr('class', "line area ".concat(klass));
+           });
+           var rVertex = 2.5;
+           [[c1, c1], [c1, c2], [c2, c2], [c2, c1]].forEach(function (point) {
+             fillEnter.append('circle').attr('class', 'vertex').attr('cx', point[0]).attr('cy', point[1]).attr('r', rVertex);
+           });
 
-           function addWay(loc, edge) {
-               var node = osmNode({ tags: defaultTags });
+           if (!isSmall()) {
+             var rMidpoint = 1.25;
+             [[c1, w / 2], [c2, w / 2], [h / 2, c1], [h / 2, c2]].forEach(function (point) {
+               fillEnter.append('circle').attr('class', 'midpoint').attr('cx', point[0]).attr('cy', point[1]).attr('r', rMidpoint);
+             });
+           }
 
-               context.perform(
-                   actionAddMidpoint({loc: loc, edge: edge}, node),
-                   _t('operations.add.annotation.vertex')
-               );
+           fill = fillEnter.merge(fill);
+           fill.selectAll('path.stroke').attr('class', "area stroke ".concat(tagClasses));
+           fill.selectAll('path.fill').attr('class', "area fill ".concat(tagClasses));
+         }
+
+         function renderLine(container, drawLine, tagClasses) {
+           var line = container.selectAll('.preset-icon-line').data(drawLine ? [0] : []);
+           line.exit().remove();
+           var lineEnter = line.enter();
+           var d = isSmall() ? 40 : 60; // draw the line parametrically
+
+           var w = d;
+           var h = d;
+           var y = Math.round(d * 0.72);
+           var l = Math.round(d * 0.6);
+           var r = 2.5;
+           var x1 = (w - l) / 2;
+           var x2 = x1 + l;
+           lineEnter = lineEnter.append('svg').attr('class', 'preset-icon-line').attr('width', w).attr('height', h).attr('viewBox', "0 0 ".concat(w, " ").concat(h));
+           ['casing', 'stroke'].forEach(function (klass) {
+             lineEnter.append('path').attr('d', "M".concat(x1, " ").concat(y, " L").concat(x2, " ").concat(y)).attr('class', "line ".concat(klass));
+           });
+           [[x1 - 1, y], [x2 + 1, y]].forEach(function (point) {
+             lineEnter.append('circle').attr('class', 'vertex').attr('cx', point[0]).attr('cy', point[1]).attr('r', r);
+           });
+           line = lineEnter.merge(line);
+           line.selectAll('path.stroke').attr('class', "line stroke ".concat(tagClasses));
+           line.selectAll('path.casing').attr('class', "line casing ".concat(tagClasses));
+         }
+
+         function renderRoute(container, drawRoute, p) {
+           var route = container.selectAll('.preset-icon-route').data(drawRoute ? [0] : []);
+           route.exit().remove();
+           var routeEnter = route.enter();
+           var d = isSmall() ? 40 : 60; // draw the route parametrically
+
+           var w = d;
+           var h = d;
+           var y1 = Math.round(d * 0.80);
+           var y2 = Math.round(d * 0.68);
+           var l = Math.round(d * 0.6);
+           var r = 2;
+           var x1 = (w - l) / 2;
+           var x2 = x1 + l / 3;
+           var x3 = x2 + l / 3;
+           var x4 = x3 + l / 3;
+           routeEnter = routeEnter.append('svg').attr('class', 'preset-icon-route').attr('width', w).attr('height', h).attr('viewBox', "0 0 ".concat(w, " ").concat(h));
+           ['casing', 'stroke'].forEach(function (klass) {
+             routeEnter.append('path').attr('d', "M".concat(x1, " ").concat(y1, " L").concat(x2, " ").concat(y2)).attr('class', "segment0 line ".concat(klass));
+             routeEnter.append('path').attr('d', "M".concat(x2, " ").concat(y2, " L").concat(x3, " ").concat(y1)).attr('class', "segment1 line ".concat(klass));
+             routeEnter.append('path').attr('d', "M".concat(x3, " ").concat(y1, " L").concat(x4, " ").concat(y2)).attr('class', "segment2 line ".concat(klass));
+           });
+           [[x1, y1], [x2, y2], [x3, y1], [x4, y2]].forEach(function (point) {
+             routeEnter.append('circle').attr('class', 'vertex').attr('cx', point[0]).attr('cy', point[1]).attr('r', r);
+           });
+           route = routeEnter.merge(route);
 
-               enterSelectMode(node);
-           }
+           if (drawRoute) {
+             var routeType = p.tags.type === 'waterway' ? 'waterway' : p.tags.route;
+             var segmentPresetIDs = routeSegments[routeType];
 
-           function enterSelectMode(node) {
-               context.enter(
-                   modeSelect(context, [node.id]).newFeature(true)
-               );
+             for (var i in segmentPresetIDs) {
+               var segmentPreset = _mainPresetIndex.item(segmentPresetIDs[i]);
+               var segmentTagClasses = svgTagClasses().getClassesString(segmentPreset.tags, '');
+               route.selectAll("path.stroke.segment".concat(i)).attr('class', "segment".concat(i, " line stroke ").concat(segmentTagClasses));
+               route.selectAll("path.casing.segment".concat(i)).attr('class', "segment".concat(i, " line casing ").concat(segmentTagClasses));
+             }
            }
+         } // Route icons are drawn with a zigzag annotation underneath:
+         //     o   o
+         //    / \ /
+         //   o   o
+         // This dataset defines the styles that are used to draw the zigzag segments.
 
 
-           function addNode(node) {
-               if (Object.keys(defaultTags).length === 0) {
-                   enterSelectMode(node);
-                   return;
-               }
+         var routeSegments = {
+           bicycle: ['highway/cycleway', 'highway/cycleway', 'highway/cycleway'],
+           bus: ['highway/unclassified', 'highway/secondary', 'highway/primary'],
+           trolleybus: ['highway/unclassified', 'highway/secondary', 'highway/primary'],
+           detour: ['highway/tertiary', 'highway/residential', 'highway/unclassified'],
+           ferry: ['route/ferry', 'route/ferry', 'route/ferry'],
+           foot: ['highway/footway', 'highway/footway', 'highway/footway'],
+           hiking: ['highway/path', 'highway/path', 'highway/path'],
+           horse: ['highway/bridleway', 'highway/bridleway', 'highway/bridleway'],
+           light_rail: ['railway/light_rail', 'railway/light_rail', 'railway/light_rail'],
+           monorail: ['railway/monorail', 'railway/monorail', 'railway/monorail'],
+           pipeline: ['man_made/pipeline', 'man_made/pipeline', 'man_made/pipeline'],
+           piste: ['piste/downhill', 'piste/hike', 'piste/nordic'],
+           power: ['power/line', 'power/line', 'power/line'],
+           road: ['highway/secondary', 'highway/primary', 'highway/trunk'],
+           subway: ['railway/subway', 'railway/subway', 'railway/subway'],
+           train: ['railway/rail', 'railway/rail', 'railway/rail'],
+           tram: ['railway/tram', 'railway/tram', 'railway/tram'],
+           waterway: ['waterway/stream', 'waterway/stream', 'waterway/stream']
+         };
 
-               var tags = Object.assign({}, node.tags);  // shallow copy
-               for (var key in defaultTags) {
-                   tags[key] = defaultTags[key];
-               }
+         function render() {
+           var p = _preset.apply(this, arguments);
 
-               context.perform(
-                   actionChangeTags(node.id, tags),
-                   _t('operations.add.annotation.point')
-               );
+           var geom = _geometry ? _geometry.apply(this, arguments) : null;
 
-               enterSelectMode(node);
+           if (geom === 'relation' && p.tags && (p.tags.type === 'route' && p.tags.route && routeSegments[p.tags.route] || p.tags.type === 'waterway')) {
+             geom = 'route';
            }
 
+           var showThirdPartyIcons = corePreferences('preferences.privacy.thirdpartyicons') || 'true';
+           var isFallback = isSmall() && p.isFallback && p.isFallback();
+           var imageURL = showThirdPartyIcons === 'true' && p.imageURL;
+           var picon = getIcon(p, geom);
+           var isMaki = picon && /^maki-/.test(picon);
+           var isTemaki = picon && /^temaki-/.test(picon);
+           var isFa = picon && /^fa[srb]-/.test(picon);
+           var isiDIcon = picon && !(isMaki || isTemaki || isFa);
+           var isCategory = !p.setTags;
+           var drawPoint = picon && geom === 'point' && isSmall() && !isFallback;
+           var drawVertex = picon !== null && geom === 'vertex' && (!isSmall() || !isFallback);
+           var drawLine = picon && geom === 'line' && !isFallback && !isCategory;
+           var drawArea = picon && geom === 'area' && !isFallback;
+           var drawRoute = picon && geom === 'route';
+           var isFramed = drawVertex || drawArea || drawLine || drawRoute;
+           var tags = !isCategory ? p.setTags({}, geom) : {};
 
-           function cancel() {
-               context.enter(modeBrowse(context));
+           for (var k in tags) {
+             if (tags[k] === '*') {
+               tags[k] = 'yes';
+             }
            }
 
+           var tagClasses = svgTagClasses().getClassesString(tags, '');
+           var selection = select(this);
+           var container = selection.selectAll('.preset-icon-container').data([0]);
+           container = container.enter().append('div').attr('class', "preset-icon-container ".concat(_sizeClass)).merge(container);
+           container.classed('showing-img', !!imageURL).classed('fallback', isFallback);
+           renderPointBorder(container, drawPoint);
+           renderCircleFill(container, drawVertex);
+           renderSquareFill(container, drawArea, tagClasses);
+           renderLine(container, drawLine, tagClasses);
+           renderRoute(container, drawRoute, p);
+           var icon = container.selectAll('.preset-icon').data(picon ? [0] : []);
+           icon.exit().remove();
+           icon = icon.enter().append('div').attr('class', 'preset-icon').call(svgIcon('')).merge(icon);
+           icon.attr('class', 'preset-icon ' + (geom ? geom + '-geom' : '')).classed('framed', isFramed).classed('preset-icon-iD', isiDIcon);
+           icon.selectAll('svg').attr('class', 'icon ' + picon + ' ' + (!isiDIcon && geom !== 'line' ? '' : tagClasses));
+           icon.selectAll('use').attr('href', '#' + picon + (isMaki ? isSmall() && geom === 'point' ? '-11' : '-15' : ''));
+           var imageIcon = container.selectAll('img.image-icon').data(imageURL ? [0] : []);
+           imageIcon.exit().remove();
+           imageIcon = imageIcon.enter().append('img').attr('class', 'image-icon').on('load', function () {
+             return container.classed('showing-img', true);
+           }).on('error', function () {
+             return container.classed('showing-img', false);
+           }).merge(imageIcon);
+           imageIcon.attr('src', imageURL);
+         }
+
+         presetIcon.preset = function (val) {
+           if (!arguments.length) return _preset;
+           _preset = utilFunctor(val);
+           return presetIcon;
+         };
 
-           mode.enter = function() {
-               context.install(behavior);
-           };
-
-
-           mode.exit = function() {
-               context.uninstall(behavior);
-           };
+         presetIcon.geometry = function (val) {
+           if (!arguments.length) return _geometry;
+           _geometry = utilFunctor(val);
+           return presetIcon;
+         };
 
+         presetIcon.sizeClass = function (val) {
+           if (!arguments.length) return _sizeClass;
+           _sizeClass = val;
+           return presetIcon;
+         };
 
-           return mode;
+         return presetIcon;
        }
 
-       function modeAddNote(context) {
-           var mode = {
-               id: 'add-note',
-               button: 'note',
-               title: _t('modes.add_note.title'),
-               description: _t('modes.add_note.description'),
-               key: _t('modes.add_note.key')
-           };
-
-           var behavior = behaviorDraw(context)
-               .on('click', add)
-               .on('cancel', cancel)
-               .on('finish', cancel);
-
-
-           function add(loc) {
-               var osm = services.osm;
-               if (!osm) return;
-
-               var note = osmNote({ loc: loc, status: 'open', comments: [] });
-               osm.replaceNote(note);
+       function uiSectionFeatureType(context) {
+         var dispatch$1 = dispatch('choose');
+         var _entityIDs = [];
+         var _presets = [];
+
+         var _tagReference;
+
+         var section = uiSection('feature-type', context).label(_t.html('inspector.feature_type')).disclosureContent(renderDisclosureContent);
+
+         function renderDisclosureContent(selection) {
+           selection.classed('preset-list-item', true);
+           selection.classed('mixed-types', _presets.length > 1);
+           var presetButtonWrap = selection.selectAll('.preset-list-button-wrap').data([0]).enter().append('div').attr('class', 'preset-list-button-wrap');
+           var presetButton = presetButtonWrap.append('button').attr('class', 'preset-list-button preset-reset').call(uiTooltip().title(_t.html('inspector.back_tooltip')).placement('bottom'));
+           presetButton.append('div').attr('class', 'preset-icon-container');
+           presetButton.append('div').attr('class', 'label').append('div').attr('class', 'label-inner');
+           presetButtonWrap.append('div').attr('class', 'accessory-buttons');
+           var tagReferenceBodyWrap = selection.selectAll('.tag-reference-body-wrap').data([0]);
+           tagReferenceBodyWrap = tagReferenceBodyWrap.enter().append('div').attr('class', 'tag-reference-body-wrap').merge(tagReferenceBodyWrap); // update header
+
+           if (_tagReference) {
+             selection.selectAll('.preset-list-button-wrap .accessory-buttons').style('display', _presets.length === 1 ? null : 'none').call(_tagReference.button);
+             tagReferenceBodyWrap.style('display', _presets.length === 1 ? null : 'none').call(_tagReference.body);
+           }
+
+           selection.selectAll('.preset-reset').on('click', function () {
+             dispatch$1.call('choose', this, _presets);
+           }).on('pointerdown pointerup mousedown mouseup', function (d3_event) {
+             d3_event.preventDefault();
+             d3_event.stopPropagation();
+           });
+           var geometries = entityGeometries();
+           selection.select('.preset-list-item button').call(uiPresetIcon().geometry(_presets.length === 1 ? geometries.length === 1 && geometries[0] : null).preset(_presets.length === 1 ? _presets[0] : _mainPresetIndex.item('point')));
+           var names = _presets.length === 1 ? [_presets[0].nameLabel(), _presets[0].subtitleLabel()].filter(Boolean) : [_t('inspector.multiple_types')];
+           var label = selection.select('.label-inner');
+           var nameparts = label.selectAll('.namepart').data(names, function (d) {
+             return d;
+           });
+           nameparts.exit().remove();
+           nameparts.enter().append('div').attr('class', 'namepart').html(function (d) {
+             return d;
+           });
+         }
 
-               // force a reraw (there is no history change that would otherwise do this)
-               context.map().pan([0,0]);
+         section.entityIDs = function (val) {
+           if (!arguments.length) return _entityIDs;
+           _entityIDs = val;
+           return section;
+         };
 
-               context
-                   .selectedNoteID(note.id)
-                   .enter(modeSelectNote(context, note.id).newFeature(true));
-           }
+         section.presets = function (val) {
+           if (!arguments.length) return _presets; // don't reload the same preset
 
+           if (!utilArrayIdentical(val, _presets)) {
+             _presets = val;
 
-           function cancel() {
-               context.enter(modeBrowse(context));
+             if (_presets.length === 1) {
+               _tagReference = uiTagReference(_presets[0].reference()).showing(false);
+             }
            }
 
+           return section;
+         };
 
-           mode.enter = function() {
-               context.install(behavior);
-           };
-
+         function entityGeometries() {
+           var counts = {};
 
-           mode.exit = function() {
-               context.uninstall(behavior);
-           };
+           for (var i in _entityIDs) {
+             var geometry = context.graph().geometry(_entityIDs[i]);
+             if (!counts[geometry]) counts[geometry] = 0;
+             counts[geometry] += 1;
+           }
 
+           return Object.keys(counts).sort(function (geom1, geom2) {
+             return counts[geom2] - counts[geom1];
+           });
+         }
 
-           return mode;
+         return utilRebind(section, dispatch$1, 'on');
        }
 
-       function uiConflicts(context) {
-           var dispatch$1 = dispatch('cancel', 'save');
-           var keybinding = utilKeybinding('conflicts');
-           var _origChanges;
-           var _conflictList;
-           var _shownConflictIndex;
-
-
-           function keybindingOn() {
-               select(document)
-                   .call(keybinding.on('⎋', cancel, true));
-           }
+       // It borrows some code from uiHelp
 
-           function keybindingOff() {
-               select(document)
-                   .call(keybinding.unbind);
-           }
+       function uiFieldHelp(context, fieldName) {
+         var fieldHelp = {};
 
-           function tryAgain() {
-               keybindingOff();
-               dispatch$1.call('save');
-           }
+         var _inspector = select(null);
 
-           function cancel() {
-               keybindingOff();
-               dispatch$1.call('cancel');
-           }
+         var _wrap = select(null);
 
+         var _body = select(null);
 
-           function conflicts(selection) {
-               keybindingOn();
+         var fieldHelpKeys = {
+           restrictions: [['about', ['about', 'from_via_to', 'maxdist', 'maxvia']], ['inspecting', ['about', 'from_shadow', 'allow_shadow', 'restrict_shadow', 'only_shadow', 'restricted', 'only']], ['modifying', ['about', 'indicators', 'allow_turn', 'restrict_turn', 'only_turn']], ['tips', ['simple', 'simple_example', 'indirect', 'indirect_example', 'indirect_noedit']]]
+         };
+         var fieldHelpHeadings = {};
+         var replacements = {
+           distField: _t.html('restriction.controls.distance'),
+           viaField: _t.html('restriction.controls.via'),
+           fromShadow: icon('#iD-turn-shadow', 'inline shadow from'),
+           allowShadow: icon('#iD-turn-shadow', 'inline shadow allow'),
+           restrictShadow: icon('#iD-turn-shadow', 'inline shadow restrict'),
+           onlyShadow: icon('#iD-turn-shadow', 'inline shadow only'),
+           allowTurn: icon('#iD-turn-yes', 'inline turn'),
+           restrictTurn: icon('#iD-turn-no', 'inline turn'),
+           onlyTurn: icon('#iD-turn-only', 'inline turn')
+         }; // For each section, squash all the texts into a single markdown document
 
-               var headerEnter = selection.selectAll('.header')
-                   .data([0])
-                   .enter()
-                   .append('div')
-                   .attr('class', 'header fillL');
+         var docs = fieldHelpKeys[fieldName].map(function (key) {
+           var helpkey = 'help.field.' + fieldName + '.' + key[0];
+           var text = key[1].reduce(function (all, part) {
+             var subkey = helpkey + '.' + part;
+             var depth = fieldHelpHeadings[subkey]; // is this subkey a heading?
 
-               headerEnter
-                   .append('button')
-                   .attr('class', 'fr')
-                   .on('click', cancel)
-                   .call(svgIcon('#iD-icon-close'));
+             var hhh = depth ? Array(depth + 1).join('#') + ' ' : ''; // if so, prepend with some ##'s
 
-               headerEnter
-                   .append('h3')
-                   .text(_t('save.conflict.header'));
+             return all + hhh + _t.html(subkey, replacements) + '\n\n';
+           }, '');
+           return {
+             key: helpkey,
+             title: _t.html(helpkey + '.title'),
+             html: marked_1(text.trim())
+           };
+         });
 
-               var bodyEnter = selection.selectAll('.body')
-                   .data([0])
-                   .enter()
-                   .append('div')
-                   .attr('class', 'body fillL');
+         function show() {
+           updatePosition();
 
-               var conflictsHelpEnter = bodyEnter
-                   .append('div')
-                   .attr('class', 'conflicts-help')
-                   .text(_t('save.conflict.help'));
+           _body.classed('hide', false).style('opacity', '0').transition().duration(200).style('opacity', '1');
+         }
 
+         function hide() {
+           _body.classed('hide', true).transition().duration(200).style('opacity', '0').on('end', function () {
+             _body.classed('hide', true);
+           });
+         }
 
-               // Download changes link
-               var detected = utilDetect();
-               var changeset = new osmChangeset();
+         function clickHelp(index) {
+           var d = docs[index];
+           var tkeys = fieldHelpKeys[fieldName][index][1];
 
-               delete changeset.id;  // Export without changeset_id
+           _body.selectAll('.field-help-nav-item').classed('active', function (d, i) {
+             return i === index;
+           });
 
-               var data = JXON.stringify(changeset.osmChangeJXON(_origChanges));
-               var blob = new Blob([data], { type: 'text/xml;charset=utf-8;' });
-               var fileName = 'changes.osc';
+           var content = _body.selectAll('.field-help-content').html(d.html); // class the paragraphs so we can find and style them
 
-               var linkEnter = conflictsHelpEnter.selectAll('.download-changes')
-                   .append('a')
-                   .attr('class', 'download-changes');
 
-               if (detected.download) {      // All except IE11 and Edge
-                   linkEnter                 // download the data as a file
-                       .attr('href', window.URL.createObjectURL(blob))
-                       .attr('download', fileName);
+           content.selectAll('p').attr('class', function (d, i) {
+             return tkeys[i];
+           }); // insert special content for certain help sections
 
-               } else {                      // IE11 and Edge
-                   linkEnter                 // open data uri in a new tab
-                       .attr('target', '_blank')
-                       .on('click.download', function() {
-                           navigator.msSaveBlob(blob, fileName);
-                       });
-               }
+           if (d.key === 'help.field.restrictions.inspecting') {
+             content.insert('img', 'p.from_shadow').attr('class', 'field-help-image cf').attr('src', context.imagePath('tr_inspect.gif'));
+           } else if (d.key === 'help.field.restrictions.modifying') {
+             content.insert('img', 'p.allow_turn').attr('class', 'field-help-image cf').attr('src', context.imagePath('tr_modify.gif'));
+           }
+         }
 
-               linkEnter
-                   .call(svgIcon('#iD-icon-load', 'inline'))
-                   .append('span')
-                   .text(_t('save.conflict.download_changes'));
+         fieldHelp.button = function (selection) {
+           if (_body.empty()) return;
+           var button = selection.selectAll('.field-help-button').data([0]); // enter/update
 
+           button.enter().append('button').attr('class', 'field-help-button').call(svgIcon('#iD-icon-help')).merge(button).on('click', function (d3_event) {
+             d3_event.stopPropagation();
+             d3_event.preventDefault();
 
-               bodyEnter
-                   .append('div')
-                   .attr('class', 'conflict-container fillL3')
-                   .call(showConflict, 0);
+             if (_body.classed('hide')) {
+               show();
+             } else {
+               hide();
+             }
+           });
+         };
 
-               bodyEnter
-                   .append('div')
-                   .attr('class', 'conflicts-done')
-                   .attr('opacity', 0)
-                   .style('display', 'none')
-                   .text(_t('save.conflict.done'));
+         function updatePosition() {
+           var wrap = _wrap.node();
 
-               var buttonsEnter = bodyEnter
-                   .append('div')
-                   .attr('class','buttons col12 joined conflicts-buttons');
+           var inspector = _inspector.node();
 
-               buttonsEnter
-                   .append('button')
-                   .attr('disabled', _conflictList.length > 1)
-                   .attr('class', 'action conflicts-button col6')
-                   .text(_t('save.title'))
-                   .on('click.try_again', tryAgain);
+           var wRect = wrap.getBoundingClientRect();
+           var iRect = inspector.getBoundingClientRect();
 
-               buttonsEnter
-                   .append('button')
-                   .attr('class', 'secondary-action conflicts-button col6')
-                   .text(_t('confirm.cancel'))
-                   .on('click.cancel', cancel);
-           }
+           _body.style('top', wRect.top + inspector.scrollTop - iRect.top + 'px');
+         }
 
+         fieldHelp.body = function (selection) {
+           // This control expects the field to have a form-field-input-wrap div
+           _wrap = selection.selectAll('.form-field-input-wrap');
+           if (_wrap.empty()) return; // absolute position relative to the inspector, so it "floats" above the fields
 
-           function showConflict(selection, index) {
-               index = utilWrap(index, _conflictList.length);
-               _shownConflictIndex = index;
+           _inspector = context.container().select('.sidebar .entity-editor-pane .inspector-body');
+           if (_inspector.empty()) return;
+           _body = _inspector.selectAll('.field-help-body').data([0]);
 
-               var parent = select(selection.node().parentNode);
+           var enter = _body.enter().append('div').attr('class', 'field-help-body hide'); // initially hidden
 
-               // enable save button if this is the last conflict being reviewed..
-               if (index === _conflictList.length - 1) {
-                   window.setTimeout(function() {
-                       parent.select('.conflicts-button')
-                           .attr('disabled', null);
 
-                       parent.select('.conflicts-done')
-                           .transition()
-                           .attr('opacity', 1)
-                           .style('display', 'block');
-                   }, 250);
-               }
+           var titleEnter = enter.append('div').attr('class', 'field-help-title cf');
+           titleEnter.append('h2').attr('class', _mainLocalizer.textDirection() === 'rtl' ? 'fr' : 'fl').html(_t.html('help.field.' + fieldName + '.title'));
+           titleEnter.append('button').attr('class', 'fr close').on('click', function (d3_event) {
+             d3_event.stopPropagation();
+             d3_event.preventDefault();
+             hide();
+           }).call(svgIcon('#iD-icon-close'));
+           var navEnter = enter.append('div').attr('class', 'field-help-nav cf');
+           var titles = docs.map(function (d) {
+             return d.title;
+           });
+           navEnter.selectAll('.field-help-nav-item').data(titles).enter().append('div').attr('class', 'field-help-nav-item').html(function (d) {
+             return d;
+           }).on('click', function (d3_event, d) {
+             d3_event.stopPropagation();
+             d3_event.preventDefault();
+             clickHelp(titles.indexOf(d));
+           });
+           enter.append('div').attr('class', 'field-help-content');
+           _body = _body.merge(enter);
+           clickHelp(0);
+         };
 
-               var conflict = selection
-                   .selectAll('.conflict')
-                   .data([_conflictList[index]]);
+         return fieldHelp;
+       }
 
-               conflict.exit()
-                   .remove();
+       function uiFieldCheck(field, context) {
+         var dispatch$1 = dispatch('change');
+         var options = field.strings && field.strings.options;
+         var values = [];
+         var texts = [];
 
-               var conflictEnter = conflict.enter()
-                   .append('div')
-                   .attr('class', 'conflict');
-
-               conflictEnter
-                   .append('h4')
-                   .attr('class', 'conflict-count')
-                   .text(_t('save.conflict.count', { num: index + 1, total: _conflictList.length }));
-
-               conflictEnter
-                   .append('a')
-                   .attr('class', 'conflict-description')
-                   .attr('href', '#')
-                   .text(function(d) { return d.name; })
-                   .on('click', function(d) {
-                       event.preventDefault();
-                       zoomToEntity(d.id);
-                   });
+         var _tags;
 
-               var details = conflictEnter
-                   .append('div')
-                   .attr('class', 'conflict-detail-container');
+         var input = select(null);
+         var text = select(null);
+         var label = select(null);
+         var reverser = select(null);
 
-               details
-                   .append('ul')
-                   .attr('class', 'conflict-detail-list')
-                   .selectAll('li')
-                   .data(function(d) { return d.details || []; })
-                   .enter()
-                   .append('li')
-                   .attr('class', 'conflict-detail-item')
-                   .html(function(d) { return d; });
+         var _impliedYes;
 
-               details
-                   .append('div')
-                   .attr('class', 'conflict-choices')
-                   .call(addChoices);
+         var _entityIDs = [];
 
-               details
-                   .append('div')
-                   .attr('class', 'conflict-nav-buttons joined cf')
-                   .selectAll('button')
-                   .data(['previous', 'next'])
-                   .enter()
-                   .append('button')
-                   .text(function(d) { return _t('save.conflict.' + d); })
-                   .attr('class', 'conflict-nav-button action col6')
-                   .attr('disabled', function(d, i) {
-                       return (i === 0 && index === 0) ||
-                           (i === 1 && index === _conflictList.length - 1) || null;
-                   })
-                   .on('click', function(d, i) {
-                       event.preventDefault();
-
-                       var container = parent.selectAll('.conflict-container');
-                       var sign = (i === 0 ? -1 : 1);
-
-                       container
-                           .selectAll('.conflict')
-                           .remove();
-
-                       container
-                           .call(showConflict, index + sign);
-                   });
+         var _value;
 
+         if (options) {
+           for (var k in options) {
+             values.push(k === 'undefined' ? undefined : k);
+             texts.push(field.t.html('options.' + k, {
+               'default': options[k]
+             }));
            }
+         } else {
+           values = [undefined, 'yes'];
+           texts = [_t.html('inspector.unknown'), _t.html('inspector.check.yes')];
 
-
-           function addChoices(selection) {
-               var choices = selection
-                   .append('ul')
-                   .attr('class', 'layer-list')
-                   .selectAll('li')
-                   .data(function(d) { return d.choices || []; });
-
-               // enter
-               var choicesEnter = choices.enter()
-                   .append('li')
-                   .attr('class', 'layer');
-
-               var labelEnter = choicesEnter
-                   .append('label');
-
-               labelEnter
-                   .append('input')
-                   .attr('type', 'radio')
-                   .attr('name', function(d) { return d.id; })
-                   .on('change', function(d, i) {
-                       var ul = this.parentNode.parentNode.parentNode;
-                       ul.__data__.chosen = i;
-                       choose(ul, d);
-                   });
-
-               labelEnter
-                   .append('span')
-                   .text(function(d) { return d.text; });
-
-               // update
-               choicesEnter
-                   .merge(choices)
-                   .each(function(d, i) {
-                       var ul = this.parentNode;
-                       if (ul.__data__.chosen === i) {
-                           choose(ul, d);
-                       }
-                   });
+           if (field.type !== 'defaultCheck') {
+             values.push('no');
+             texts.push(_t.html('inspector.check.no'));
            }
+         } // Checks tags to see whether an undefined value is "Assumed to be Yes"
 
 
-           function choose(ul, datum) {
-               if (event) event.preventDefault();
+         function checkImpliedYes() {
+           _impliedYes = field.id === 'oneway_yes'; // hack: pretend `oneway` field is a `oneway_yes` field
+           // where implied oneway tag exists (e.g. `junction=roundabout`) #2220, #1841
 
-               select(ul)
-                   .selectAll('li')
-                   .classed('active', function(d) { return d === datum; })
-                   .selectAll('input')
-                   .property('checked', function(d) { return d === datum; });
+           if (field.id === 'oneway') {
+             var entity = context.entity(_entityIDs[0]);
 
-               var extent = geoExtent();
-               var entity;
+             for (var key in entity.tags) {
+               if (key in osmOneWayTags && entity.tags[key] in osmOneWayTags[key]) {
+                 _impliedYes = true;
+                 texts[0] = _t.html('presets.fields.oneway_yes.options.undefined');
+                 break;
+               }
+             }
+           }
+         }
 
-               entity = context.graph().hasEntity(datum.id);
-               if (entity) extent._extend(entity.extent(context.graph()));
+         function reverserHidden() {
+           if (!context.container().select('div.inspector-hover').empty()) return true;
+           return !(_value === 'yes' || _impliedYes && !_value);
+         }
 
-               datum.action();
+         function reverserSetText(selection) {
+           var entity = _entityIDs.length && context.hasEntity(_entityIDs[0]);
+           if (reverserHidden() || !entity) return selection;
+           var first = entity.first();
+           var last = entity.isClosed() ? entity.nodes[entity.nodes.length - 2] : entity.last();
+           var pseudoDirection = first < last;
+           var icon = pseudoDirection ? '#iD-icon-forward' : '#iD-icon-backward';
+           selection.selectAll('.reverser-span').html(_t.html('inspector.check.reverser')).call(svgIcon(icon, 'inline'));
+           return selection;
+         }
 
-               entity = context.graph().hasEntity(datum.id);
-               if (entity) extent._extend(entity.extent(context.graph()));
+         var check = function check(selection) {
+           checkImpliedYes();
+           label = selection.selectAll('.form-field-input-wrap').data([0]);
+           var enter = label.enter().append('label').attr('class', 'form-field-input-wrap form-field-input-check');
+           enter.append('input').property('indeterminate', field.type !== 'defaultCheck').attr('type', 'checkbox').attr('id', field.domId);
+           enter.append('span').html(texts[0]).attr('class', 'value');
 
-               zoomToEntity(datum.id, extent);
+           if (field.type === 'onewayCheck') {
+             enter.append('button').attr('class', 'reverser' + (reverserHidden() ? ' hide' : '')).append('span').attr('class', 'reverser-span');
            }
 
+           label = label.merge(enter);
+           input = label.selectAll('input');
+           text = label.selectAll('span.value');
+           input.on('click', function (d3_event) {
+             d3_event.stopPropagation();
+             var t = {};
 
-           function zoomToEntity(id, extent) {
-               context.surface().selectAll('.hover')
-                   .classed('hover', false);
-
-               var entity = context.graph().hasEntity(id);
-               if (entity) {
-                   if (extent) {
-                       context.map().trimmedExtent(extent);
-                   } else {
-                       context.map().zoomToEase(entity);
-                   }
-                   context.surface().selectAll(utilEntityOrMemberSelector([entity.id], context.graph()))
-                       .classed('hover', true);
+             if (Array.isArray(_tags[field.key])) {
+               if (values.indexOf('yes') !== -1) {
+                 t[field.key] = 'yes';
+               } else {
+                 t[field.key] = values[0];
                }
-           }
-
-
-           // The conflict list should be an array of objects like:
-           // {
-           //     id: id,
-           //     name: entityName(local),
-           //     details: merge.conflicts(),
-           //     chosen: 1,
-           //     choices: [
-           //         choice(id, keepMine, forceLocal),
-           //         choice(id, keepTheirs, forceRemote)
-           //     ]
-           // }
-           conflicts.conflictList = function(_) {
-               if (!arguments.length) return _conflictList;
-               _conflictList = _;
-               return conflicts;
-           };
-
+             } else {
+               t[field.key] = values[(values.indexOf(_value) + 1) % values.length];
+             } // Don't cycle through `alternating` or `reversible` states - #4970
+             // (They are supported as translated strings, but should not toggle with clicks)
 
-           conflicts.origChanges = function(_) {
-               if (!arguments.length) return _origChanges;
-               _origChanges = _;
-               return conflicts;
-           };
 
+             if (t[field.key] === 'reversible' || t[field.key] === 'alternating') {
+               t[field.key] = values[0];
+             }
 
-           conflicts.shownEntityIds = function() {
-               if (_conflictList && typeof _shownConflictIndex === 'number') {
-                   return [_conflictList[_shownConflictIndex].id];
-               }
-               return [];
-           };
+             dispatch$1.call('change', this, t);
+           });
 
+           if (field.type === 'onewayCheck') {
+             reverser = label.selectAll('.reverser');
+             reverser.call(reverserSetText).on('click', function (d3_event) {
+               d3_event.preventDefault();
+               d3_event.stopPropagation();
+               context.perform(function (graph) {
+                 for (var i in _entityIDs) {
+                   graph = actionReverse(_entityIDs[i])(graph);
+                 }
 
-           return utilRebind(conflicts, dispatch$1, 'on');
-       }
+                 return graph;
+               }, _t('operations.reverse.annotation.line', {
+                 n: 1
+               })); // must manually revalidate since no 'change' event was called
 
-       function uiConfirm(selection) {
-           var modalSelection = uiModal(selection);
+               context.validator().validate();
+               select(this).call(reverserSetText);
+             });
+           }
+         };
 
-           modalSelection.select('.modal')
-               .classed('modal-alert', true);
+         check.entityIDs = function (val) {
+           if (!arguments.length) return _entityIDs;
+           _entityIDs = val;
+           return check;
+         };
 
-           var section = modalSelection.select('.content');
+         check.tags = function (tags) {
+           _tags = tags;
 
-           section.append('div')
-               .attr('class', 'modal-section header');
+           function isChecked(val) {
+             return val !== 'no' && val !== '' && val !== undefined && val !== null;
+           }
 
-           section.append('div')
-               .attr('class', 'modal-section message-text');
+           function textFor(val) {
+             if (val === '') val = undefined;
+             var index = values.indexOf(val);
+             return index !== -1 ? texts[index] : '"' + val + '"';
+           }
 
-           var buttons = section.append('div')
-               .attr('class', 'modal-section buttons cf');
+           checkImpliedYes();
+           var isMixed = Array.isArray(tags[field.key]);
+           _value = !isMixed && tags[field.key] && tags[field.key].toLowerCase();
 
+           if (field.type === 'onewayCheck' && (_value === '1' || _value === '-1')) {
+             _value = 'yes';
+           }
 
-           modalSelection.okButton = function() {
-               buttons
-                   .append('button')
-                   .attr('class', 'button ok-button action')
-                   .on('click.confirm', function() {
-                       modalSelection.remove();
-                   })
-                   .text(_t('confirm.okay'))
-                   .node()
-                   .focus();
+           input.property('indeterminate', isMixed || field.type !== 'defaultCheck' && !_value).property('checked', isChecked(_value));
+           text.html(isMixed ? _t.html('inspector.multiple_values') : textFor(_value)).classed('mixed', isMixed);
+           label.classed('set', !!_value);
 
-               return modalSelection;
-           };
+           if (field.type === 'onewayCheck') {
+             reverser.classed('hide', reverserHidden()).call(reverserSetText);
+           }
+         };
 
+         check.focus = function () {
+           input.node().focus();
+         };
 
-           return modalSelection;
+         return utilRebind(check, dispatch$1, 'on');
        }
 
-       function uiChangesetEditor(context) {
-           var dispatch$1 = dispatch('change');
-           var formFields = uiFormFields(context);
-           var commentCombo = uiCombobox(context, 'comment').caseSensitive(true);
-           var _fieldsArr;
-           var _tags;
-           var _changesetID;
+       function uiFieldCombo(field, context) {
+         var dispatch$1 = dispatch('change');
 
+         var _isMulti = field.type === 'multiCombo' || field.type === 'manyCombo';
 
-           function changesetEditor(selection) {
-               render(selection);
-           }
+         var _isNetwork = field.type === 'networkCombo';
 
+         var _isSemi = field.type === 'semiCombo';
 
-           function render(selection) {
-               var initial = false;
+         var _optstrings = field.strings && field.strings.options;
 
-               if (!_fieldsArr) {
-                   initial = true;
-                   var presets = _mainPresetIndex;
+         var _optarray = field.options;
 
-                   _fieldsArr = [
-                       uiField(context, presets.field('comment'), null, { show: true, revert: false }),
-                       uiField(context, presets.field('source'), null, { show: false, revert: false }),
-                       uiField(context, presets.field('hashtags'), null, { show: false, revert: false }),
-                   ];
+         var _snake_case = field.snake_case || field.snake_case === undefined;
 
-                   _fieldsArr.forEach(function(field) {
-                       field
-                           .on('change', function(t, onInput) {
-                               dispatch$1.call('change', field, undefined, t, onInput);
-                           });
-                   });
-               }
+         var _combobox = uiCombobox(context, 'combo-' + field.safeid).caseSensitive(field.caseSensitive).minItems(_isMulti || _isSemi ? 1 : 2);
 
-               _fieldsArr.forEach(function(field) {
-                   field
-                       .tags(_tags);
-               });
+         var _container = select(null);
 
+         var _inputWrap = select(null);
 
-               selection
-                   .call(formFields.fieldsArr(_fieldsArr));
+         var _input = select(null);
 
+         var _comboData = [];
+         var _multiData = [];
+         var _entityIDs = [];
 
-               if (initial) {
-                   var commentField = selection.select('.form-field-comment textarea');
-                   var commentNode = commentField.node();
+         var _tags;
 
-                   if (commentNode) {
-                       commentNode.focus();
-                       commentNode.select();
-                   }
+         var _countryCode;
 
-                   // trigger a 'blur' event so that comment field can be cleaned
-                   // and checked for hashtags, even if retrieved from localstorage
-                   utilTriggerEvent(commentField, 'blur');
+         var _staticPlaceholder; // initialize deprecated tags array
 
-                   var osm = context.connection();
-                   if (osm) {
-                       osm.userChangesets(function (err, changesets) {
-                           if (err) return;
-
-                           var comments = changesets.map(function(changeset) {
-                               var comment = changeset.tags.comment;
-                               return comment ? { title: comment, value: comment } : null;
-                           }).filter(Boolean);
-
-                           commentField
-                               .call(commentCombo
-                                   .data(utilArrayUniqBy(comments, 'title'))
-                               );
-                       });
-                   }
-               }
 
-               // Add warning if comment mentions Google
-               var hasGoogle = _tags.comment.match(/google/i);
-               var commentWarning = selection.select('.form-field-comment').selectAll('.comment-warning')
-                   .data(hasGoogle ? [0] : []);
+         var _dataDeprecated = [];
+         _mainFileFetcher.get('deprecated').then(function (d) {
+           _dataDeprecated = d;
+         })["catch"](function () {
+           /* ignore */
+         }); // ensure multiCombo field.key ends with a ':'
 
-               commentWarning.exit()
-                   .transition()
-                   .duration(200)
-                   .style('opacity', 0)
-                   .remove();
+         if (_isMulti && field.key && /[^:]$/.test(field.key)) {
+           field.key += ':';
+         }
 
-               var commentEnter = commentWarning.enter()
-                   .insert('div', '.tag-reference-body')
-                   .attr('class', 'field-warning comment-warning')
-                   .style('opacity', 0);
+         function snake(s) {
+           return s.replace(/\s+/g, '_');
+         }
 
-               commentEnter
-                   .append('a')
-                   .attr('target', '_blank')
-                   .attr('tabindex', -1)
-                   .call(svgIcon('#iD-icon-alert', 'inline'))
-                   .attr('href', _t('commit.google_warning_link'))
-                   .append('span')
-                   .text(_t('commit.google_warning'));
+         function unsnake(s) {
+           return s.replace(/_+/g, ' ');
+         }
 
-               commentEnter
-                   .transition()
-                   .duration(200)
-                   .style('opacity', 1);
-           }
+         function clean(s) {
+           return s.split(';').map(function (s) {
+             return s.trim();
+           }).join(';');
+         } // returns the tag value for a display value
+         // (for multiCombo, dval should be the key suffix, not the entire key)
 
 
-           changesetEditor.tags = function(_) {
-               if (!arguments.length) return _tags;
-               _tags = _;
-               // Don't reset _fieldsArr here.
-               return changesetEditor;
-           };
+         function tagValue(dval) {
+           dval = clean(dval || '');
 
+           if (_optstrings) {
+             var found = _comboData.find(function (o) {
+               return o.key && clean(o.value) === dval;
+             });
 
-           changesetEditor.changesetID = function(_) {
-               if (!arguments.length) return _changesetID;
-               if (_changesetID === _) return changesetEditor;
-               _changesetID = _;
-               _fieldsArr = null;
-               return changesetEditor;
-           };
+             if (found) {
+               return found.key;
+             }
+           }
 
+           if (field.type === 'typeCombo' && !dval) {
+             return 'yes';
+           }
 
-           return utilRebind(changesetEditor, dispatch$1, 'on');
-       }
+           return (_snake_case ? snake(dval) : dval) || undefined;
+         } // returns the display value for a tag value
+         // (for multiCombo, tval should be the key suffix, not the entire key)
 
-       function uiSectionChanges(context) {
-           var detected = utilDetect();
 
-           var _discardTags = {};
-           _mainFileFetcher.get('discarded')
-               .then(function(d) { _discardTags = d; })
-               .catch(function() { /* ignore */ });
+         function displayValue(tval) {
+           tval = tval || '';
 
-           var section = uiSection('changes-list', context)
-               .title(function() {
-                   var history = context.history();
-                   var summary = history.difference().summary();
-                   return _t('commit.changes', { count: summary.length });
-               })
-               .disclosureContent(renderDisclosureContent);
+           if (_optstrings) {
+             var found = _comboData.find(function (o) {
+               return o.key === tval && o.value;
+             });
 
-           function renderDisclosureContent(selection) {
-               var history = context.history();
-               var summary = history.difference().summary();
+             if (found) {
+               return found.value;
+             }
+           }
 
-               var container = selection.selectAll('.commit-section')
-                   .data([0]);
+           if (field.type === 'typeCombo' && tval.toLowerCase() === 'yes') {
+             return '';
+           }
 
-               var containerEnter = container.enter()
-                   .append('div')
-                   .attr('class', 'commit-section');
+           return _snake_case ? unsnake(tval) : tval;
+         } // Compute the difference between arrays of objects by `value` property
+         //
+         // objectDifference([{value:1}, {value:2}, {value:3}], [{value:2}])
+         // > [{value:1}, {value:3}]
+         //
 
-               containerEnter
-                   .append('ul')
-                   .attr('class', 'changeset-list');
 
-               container = containerEnter
-                   .merge(container);
+         function objectDifference(a, b) {
+           return a.filter(function (d1) {
+             return !b.some(function (d2) {
+               return !d2.isMixed && d1.value === d2.value;
+             });
+           });
+         }
 
+         function initCombo(selection, attachTo) {
+           if (_optstrings) {
+             selection.attr('readonly', 'readonly');
+             selection.call(_combobox, attachTo);
+             setStaticValues(setPlaceholder);
+           } else if (_optarray) {
+             selection.call(_combobox, attachTo);
+             setStaticValues(setPlaceholder);
+           } else if (services.taginfo) {
+             selection.call(_combobox.fetcher(setTaginfoValues), attachTo);
+             setTaginfoValues('', setPlaceholder);
+           }
+         }
 
-               var items = container.select('ul').selectAll('li')
-                   .data(summary);
+         function setStaticValues(callback) {
+           if (!(_optstrings || _optarray)) return;
 
-               var itemsEnter = items.enter()
-                   .append('li')
-                   .attr('class', 'change-item');
+           if (_optstrings) {
+             _comboData = Object.keys(_optstrings).map(function (k) {
+               var v = field.t('options.' + k, {
+                 'default': _optstrings[k]
+               });
+               return {
+                 key: k,
+                 value: v,
+                 title: v,
+                 display: field.t.html('options.' + k, {
+                   'default': _optstrings[k]
+                 })
+               };
+             });
+           } else if (_optarray) {
+             _comboData = _optarray.map(function (k) {
+               var v = _snake_case ? unsnake(k) : k;
+               return {
+                 key: k,
+                 value: v,
+                 title: v
+               };
+             });
+           }
 
-               itemsEnter
-                   .each(function(d) {
-                       select(this)
-                           .call(svgIcon('#iD-icon-' + d.entity.geometry(d.graph), 'pre-text ' + d.changeType));
-                   });
+           _combobox.data(objectDifference(_comboData, _multiData));
 
-               itemsEnter
-                   .append('span')
-                   .attr('class', 'change-type')
-                   .text(function(d) { return _t('commit.' + d.changeType) + ' '; });
-
-               itemsEnter
-                   .append('strong')
-                   .attr('class', 'entity-type')
-                   .text(function(d) {
-                       var matched = _mainPresetIndex.match(d.entity, d.graph);
-                       return (matched && matched.name()) || utilDisplayType(d.entity.id);
-                   });
+           if (callback) callback(_comboData);
+         }
 
-               itemsEnter
-                   .append('span')
-                   .attr('class', 'entity-name')
-                   .text(function(d) {
-                       var name = utilDisplayName(d.entity) || '',
-                           string = '';
-                       if (name !== '') {
-                           string += ':';
-                       }
-                       return string += ' ' + name;
-                   });
+         function setTaginfoValues(q, callback) {
+           var fn = _isMulti ? 'multikeys' : 'values';
+           var query = (_isMulti ? field.key : '') + q;
+           var hasCountryPrefix = _isNetwork && _countryCode && _countryCode.indexOf(q.toLowerCase()) === 0;
 
-               itemsEnter
-                   .style('opacity', 0)
-                   .transition()
-                   .style('opacity', 1);
+           if (hasCountryPrefix) {
+             query = _countryCode + ':';
+           }
 
-               items = itemsEnter
-                   .merge(items);
+           var params = {
+             debounce: q !== '',
+             key: field.key,
+             query: query
+           };
 
-               items
-                   .on('mouseover', mouseover)
-                   .on('mouseout', mouseout)
-                   .on('click', click);
+           if (_entityIDs.length) {
+             params.geometry = context.graph().geometry(_entityIDs[0]);
+           }
 
+           services.taginfo[fn](params, function (err, data) {
+             if (err) return;
+             data = data.filter(function (d) {
+               if (field.type === 'typeCombo' && d.value === 'yes') {
+                 // don't show the fallback value
+                 return false;
+               } // don't show values with very low usage
 
-               // Download changeset link
-               var changeset = new osmChangeset().update({ id: undefined });
-               var changes = history.changes(actionDiscardTags(history.difference(), _discardTags));
 
-               delete changeset.id;  // Export without chnageset_id
+               return !d.count || d.count > 10;
+             });
+             var deprecatedValues = osmEntity.deprecatedTagValuesByKey(_dataDeprecated)[field.key];
 
-               var data = JXON.stringify(changeset.osmChangeJXON(changes));
-               var blob = new Blob([data], {type: 'text/xml;charset=utf-8;'});
-               var fileName = 'changes.osc';
+             if (deprecatedValues) {
+               // don't suggest deprecated tag values
+               data = data.filter(function (d) {
+                 return deprecatedValues.indexOf(d.value) === -1;
+               });
+             }
 
-               var linkEnter = container.selectAll('.download-changes')
-                   .data([0])
-                   .enter()
-                   .append('a')
-                   .attr('class', 'download-changes');
-
-               if (detected.download) {      // All except IE11 and Edge
-                   linkEnter                 // download the data as a file
-                       .attr('href', window.URL.createObjectURL(blob))
-                       .attr('download', fileName);
-
-               } else {                      // IE11 and Edge
-                   linkEnter                 // open data uri in a new tab
-                       .attr('target', '_blank')
-                       .on('click.download', function() {
-                           navigator.msSaveBlob(blob, fileName);
-                       });
-               }
+             if (hasCountryPrefix) {
+               data = data.filter(function (d) {
+                 return d.value.toLowerCase().indexOf(_countryCode + ':') === 0;
+               });
+             } // hide the caret if there are no suggestions
 
-               linkEnter
-                   .call(svgIcon('#iD-icon-load', 'inline'))
-                   .append('span')
-                   .text(_t('commit.download_changes'));
 
+             _container.classed('empty-combobox', data.length === 0);
 
-               function mouseover(d) {
-                   if (d.entity) {
-                       context.surface().selectAll(
-                           utilEntityOrMemberSelector([d.entity.id], context.graph())
-                       ).classed('hover', true);
-                   }
-               }
+             _comboData = data.map(function (d) {
+               var k = d.value;
+               if (_isMulti) k = k.replace(field.key, '');
+               var v = _snake_case ? unsnake(k) : k;
+               return {
+                 key: k,
+                 value: v,
+                 title: _isMulti ? v : d.title
+               };
+             });
+             _comboData = objectDifference(_comboData, _multiData);
+             if (callback) callback(_comboData);
+           });
+         }
 
+         function setPlaceholder(values) {
+           if (_isMulti || _isSemi) {
+             _staticPlaceholder = field.placeholder() || _t('inspector.add');
+           } else {
+             var vals = values.map(function (d) {
+               return d.value;
+             }).filter(function (s) {
+               return s.length < 20;
+             });
+             var placeholders = vals.length > 1 ? vals : values.map(function (d) {
+               return d.key;
+             });
+             _staticPlaceholder = field.placeholder() || placeholders.slice(0, 3).join(', ');
+           }
 
-               function mouseout() {
-                   context.surface().selectAll('.hover')
-                       .classed('hover', false);
-               }
+           if (!/(…|\.\.\.)$/.test(_staticPlaceholder)) {
+             _staticPlaceholder += '…';
+           }
 
+           var ph;
 
-               function click(change) {
-                   if (change.changeType !== 'deleted') {
-                       var entity = change.entity;
-                       context.map().zoomToEase(entity);
-                       context.surface().selectAll(utilEntityOrMemberSelector([entity.id], context.graph()))
-                           .classed('hover', true);
-                   }
-               }
+           if (!_isMulti && !_isSemi && _tags && Array.isArray(_tags[field.key])) {
+             ph = _t('inspector.multiple_values');
+           } else {
+             ph = _staticPlaceholder;
            }
 
-           return section;
-       }
+           _container.selectAll('input').attr('placeholder', ph);
+         }
 
-       function uiCommitWarnings(context) {
+         function change() {
+           var t = {};
+           var val;
 
-           function commitWarnings(selection) {
-               var issuesBySeverity = context.validator()
-                   .getIssuesBySeverity({ what: 'edited', where: 'all', includeDisabledRules: true });
+           if (_isMulti || _isSemi) {
+             val = tagValue(utilGetSetValue(_input).replace(/,/g, ';')) || '';
 
-               for (var severity in issuesBySeverity) {
-                   var issues = issuesBySeverity[severity];
-                   var section = severity + '-section';
-                   var issueItem = severity + '-item';
+             _container.classed('active', false);
 
-                   var container = selection.selectAll('.' + section)
-                       .data(issues.length ? [0] : []);
+             utilGetSetValue(_input, '');
+             var vals = val.split(';').filter(Boolean);
+             if (!vals.length) return;
 
-                   container.exit()
-                       .remove();
+             if (_isMulti) {
+               utilArrayUniq(vals).forEach(function (v) {
+                 var key = (field.key || '') + v;
 
-                   var containerEnter = container.enter()
-                       .append('div')
-                       .attr('class', 'modal-section ' + section + ' fillL2');
+                 if (_tags) {
+                   // don't set a multicombo value to 'yes' if it already has a non-'no' value
+                   // e.g. `language:de=main`
+                   var old = _tags[key];
+                   if (typeof old === 'string' && old.toLowerCase() !== 'no') return;
+                 }
 
-                   containerEnter
-                       .append('h3')
-                       .text(severity === 'warning' ? _t('commit.warnings') : _t('commit.errors'));
+                 key = context.cleanTagKey(key);
+                 field.keys.push(key);
+                 t[key] = 'yes';
+               });
+             } else if (_isSemi) {
+               var arr = _multiData.map(function (d) {
+                 return d.key;
+               });
 
-                   containerEnter
-                       .append('ul')
-                       .attr('class', 'changeset-list');
+               arr = arr.concat(vals);
+               t[field.key] = context.cleanTagValue(utilArrayUniq(arr).filter(Boolean).join(';'));
+             }
 
-                   container = containerEnter
-                       .merge(container);
+             window.setTimeout(function () {
+               _input.node().focus();
+             }, 10);
+           } else {
+             var rawValue = utilGetSetValue(_input); // don't override multiple values with blank string
 
+             if (!rawValue && Array.isArray(_tags[field.key])) return;
+             val = context.cleanTagValue(tagValue(rawValue));
+             t[field.key] = val || undefined;
+           }
 
-                   var items = container.select('ul').selectAll('li')
-                       .data(issues, function(d) { return d.id; });
+           dispatch$1.call('change', this, t);
+         }
 
-                   items.exit()
-                       .remove();
+         function removeMultikey(d3_event, d) {
+           d3_event.preventDefault();
+           d3_event.stopPropagation();
+           var t = {};
 
-                   var itemsEnter = items.enter()
-                       .append('li')
-                       .attr('class', issueItem);
+           if (_isMulti) {
+             t[d.key] = undefined;
+           } else if (_isSemi) {
+             var arr = _multiData.map(function (md) {
+               return md.key === d.key ? null : md.key;
+             }).filter(Boolean);
 
-                   itemsEnter
-                       .call(svgIcon('#iD-icon-alert', 'pre-text'));
+             arr = utilArrayUniq(arr);
+             t[field.key] = arr.length ? arr.join(';') : undefined;
+           }
 
-                   itemsEnter
-                       .append('strong')
-                       .attr('class', 'issue-message');
+           dispatch$1.call('change', this, t);
+         }
 
-                   itemsEnter.filter(function(d) { return d.tooltip; })
-                       .call(uiTooltip()
-                           .title(function(d) { return d.tooltip; })
-                           .placement('top')
-                       );
+         function combo(selection) {
+           _container = selection.selectAll('.form-field-input-wrap').data([0]);
+           var type = _isMulti || _isSemi ? 'multicombo' : 'combo';
+           _container = _container.enter().append('div').attr('class', 'form-field-input-wrap form-field-input-' + type).merge(_container);
 
-                   items = itemsEnter
-                       .merge(items);
+           if (_isMulti || _isSemi) {
+             _container = _container.selectAll('.chiplist').data([0]);
+             var listClass = 'chiplist'; // Use a separate line for each value in the Destinations field
+             // to mimic highway exit signs
 
-                   items.selectAll('.issue-message')
-                       .text(function(d) {
-                           return d.message(context);
-                       });
+             if (field.key === 'destination') {
+               listClass += ' full-line-chips';
+             }
 
-                   items
-                       .on('mouseover', function(d) {
-                           if (d.entityIds) {
-                               context.surface().selectAll(
-                                   utilEntityOrMemberSelector(
-                                       d.entityIds,
-                                       context.graph()
-                                   )
-                               ).classed('hover', true);
-                           }
-                       })
-                       .on('mouseout', function() {
-                           context.surface().selectAll('.hover')
-                               .classed('hover', false);
-                       })
-                       .on('click', function(d) {
-                           context.validator().focusIssue(d);
-                       });
-               }
+             _container = _container.enter().append('ul').attr('class', listClass).on('click', function () {
+               window.setTimeout(function () {
+                 _input.node().focus();
+               }, 10);
+             }).merge(_container);
+             _inputWrap = _container.selectAll('.input-wrap').data([0]);
+             _inputWrap = _inputWrap.enter().append('li').attr('class', 'input-wrap').merge(_inputWrap);
+             _input = _inputWrap.selectAll('input').data([0]);
+           } else {
+             _input = _container.selectAll('input').data([0]);
            }
 
+           _input = _input.enter().append('input').attr('type', 'text').attr('id', field.domId).call(utilNoAuto).call(initCombo, selection).merge(_input);
 
-           return commitWarnings;
-       }
-
-       var readOnlyTags = [
-           /^changesets_count$/,
-           /^created_by$/,
-           /^ideditor:/,
-           /^imagery_used$/,
-           /^host$/,
-           /^locale$/,
-           /^warnings:/,
-           /^resolved:/,
-           /^closed:note$/,
-           /^closed:keepright$/,
-           /^closed:improveosm:/,
-           /^closed:osmose:/
-       ];
-
-       // treat most punctuation (except -, _, +, &) as hashtag delimiters - #4398
-       // from https://stackoverflow.com/a/25575009
-       var hashtagRegex = /(#[^\u2000-\u206F\u2E00-\u2E7F\s\\'!"#$%()*,.\/:;<=>?@\[\]^`{|}~]+)/g;
-
+           if (_isNetwork) {
+             var extent = combinedEntityExtent();
+             var countryCode = extent && iso1A2Code(extent.center());
+             _countryCode = countryCode && countryCode.toLowerCase();
+           }
 
-       function uiCommit(context) {
-           var dispatch$1 = dispatch('cancel');
-           var _userDetails;
-           var _selection;
+           _input.on('change', change).on('blur', change);
 
-           var changesetEditor = uiChangesetEditor(context)
-               .on('change', changeTags);
-           var rawTagEditor = uiSectionRawTagEditor('changeset-tag-editor', context)
-               .on('change', changeTags)
-               .readOnlyTags(readOnlyTags);
-           var commitChanges = uiSectionChanges(context);
-           var commitWarnings = uiCommitWarnings(context);
+           _input.on('keydown.field', function (d3_event) {
+             switch (d3_event.keyCode) {
+               case 13:
+                 // ↩ Return
+                 _input.node().blur(); // blurring also enters the value
 
 
-           function commit(selection) {
-               _selection = selection;
+                 d3_event.stopPropagation();
+                 break;
+             }
+           });
 
-               // Initialize changeset if one does not exist yet.
-               if (!context.changeset) initChangeset();
+           if (_isMulti || _isSemi) {
+             _combobox.on('accept', function () {
+               _input.node().blur();
 
-               loadDerivedChangesetTags();
+               _input.node().focus();
+             });
 
-               selection.call(render);
+             _input.on('focus', function () {
+               _container.classed('active', true);
+             });
            }
+         }
 
-           function initChangeset() {
+         combo.tags = function (tags) {
+           _tags = tags;
 
-               // expire stored comment, hashtags, source after cutoff datetime - #3947 #4899
-               var commentDate = +corePreferences('commentDate') || 0;
-               var currDate = Date.now();
-               var cutoff = 2 * 86400 * 1000;   // 2 days
-               if (commentDate > currDate || currDate - commentDate > cutoff) {
-                   corePreferences('comment', null);
-                   corePreferences('hashtags', null);
-                   corePreferences('source', null);
-               }
+           if (_isMulti || _isSemi) {
+             _multiData = [];
+             var maxLength;
 
-               // load in explicitly-set values, if any
-               if (context.defaultChangesetComment()) {
-                   corePreferences('comment', context.defaultChangesetComment());
-                   corePreferences('commentDate', Date.now());
-               }
-               if (context.defaultChangesetSource()) {
-                   corePreferences('source', context.defaultChangesetSource());
-                   corePreferences('commentDate', Date.now());
-               }
-               if (context.defaultChangesetHashtags()) {
-                   corePreferences('hashtags', context.defaultChangesetHashtags());
-                   corePreferences('commentDate', Date.now());
+             if (_isMulti) {
+               // Build _multiData array containing keys already set..
+               for (var k in tags) {
+                 if (field.key && k.indexOf(field.key) !== 0 || field.keys.indexOf(k) === -1) continue;
+                 var v = tags[k];
+                 if (!v || typeof v === 'string' && v.toLowerCase() === 'no') continue;
+                 var suffix = field.key ? k.substring(field.key.length) : k;
+
+                 _multiData.push({
+                   key: k,
+                   value: displayValue(suffix),
+                   isMixed: Array.isArray(v)
+                 });
                }
 
-               var detected = utilDetect();
-               var tags = {
-                   comment: corePreferences('comment') || '',
-                   created_by: context.cleanTagValue('iD ' + context.version),
-                   host: context.cleanTagValue(detected.host),
-                   locale: context.cleanTagValue(_mainLocalizer.localeCode())
-               };
-
-               // call findHashtags initially - this will remove stored
-               // hashtags if any hashtags are found in the comment - #4304
-               findHashtags(tags, true);
+               if (field.key) {
+                 // Set keys for form-field modified (needed for undo and reset buttons)..
+                 field.keys = _multiData.map(function (d) {
+                   return d.key;
+                 }); // limit the input length so it fits after prepending the key prefix
 
-               var hashtags = corePreferences('hashtags');
-               if (hashtags) {
-                   tags.hashtags = hashtags;
+                 maxLength = context.maxCharsForTagKey() - utilUnicodeCharsCount(field.key);
+               } else {
+                 maxLength = context.maxCharsForTagKey();
                }
+             } else if (_isSemi) {
+               var allValues = [];
+               var commonValues;
 
-               var source = corePreferences('source');
-               if (source) {
-                   tags.source = source;
-               }
-               var photoOverlaysUsed = context.history().photoOverlaysUsed();
-               if (photoOverlaysUsed.length) {
-                   var sources = (tags.source || '').split(';');
+               if (Array.isArray(tags[field.key])) {
+                 tags[field.key].forEach(function (tagVal) {
+                   var thisVals = utilArrayUniq((tagVal || '').split(';')).filter(Boolean);
+                   allValues = allValues.concat(thisVals);
 
-                   // include this tag for any photo layer
-                   if (sources.indexOf('streetlevel imagery') === -1) {
-                       sources.push('streetlevel imagery');
+                   if (!commonValues) {
+                     commonValues = thisVals;
+                   } else {
+                     commonValues = commonValues.filter(function (value) {
+                       return thisVals.includes(value);
+                     });
                    }
-
-                   // add the photo overlays used during editing as sources
-                   photoOverlaysUsed.forEach(function(photoOverlay) {
-                       if (sources.indexOf(photoOverlay) === -1) {
-                           sources.push(photoOverlay);
-                       }
-                   });
-
-                   tags.source = context.cleanTagValue(sources.join(';'));
+                 });
+                 allValues = utilArrayUniq(allValues).filter(Boolean);
+               } else {
+                 allValues = utilArrayUniq((tags[field.key] || '').split(';')).filter(Boolean);
+                 commonValues = allValues;
                }
 
-               context.changeset = new osmChangeset({ tags: tags });
-           }
-
-           // Calculates read-only metadata tags based on the user's editing session and applies
-           // them to the changeset.
-           function loadDerivedChangesetTags() {
-
-               var osm = context.connection();
-               if (!osm) return;
-
-               var tags = Object.assign({}, context.changeset.tags);   // shallow copy
-
-               // assign tags for imagery used
-               var imageryUsed = context.cleanTagValue(context.history().imageryUsed().join(';'));
-               tags.imagery_used = imageryUsed || 'None';
-
-               // assign tags for closed issues and notes
-               var osmClosed = osm.getClosedIDs();
-               var itemType;
-               if (osmClosed.length) {
-                   tags['closed:note'] = context.cleanTagValue(osmClosed.join(';'));
-               }
-               if (services.keepRight) {
-                   var krClosed = services.keepRight.getClosedIDs();
-                   if (krClosed.length) {
-                       tags['closed:keepright'] = context.cleanTagValue(krClosed.join(';'));
-                   }
-               }
-               if (services.improveOSM) {
-                   var iOsmClosed = services.improveOSM.getClosedCounts();
-                   for (itemType in iOsmClosed) {
-                       tags['closed:improveosm:' + itemType] = context.cleanTagValue(iOsmClosed[itemType].toString());
-                   }
-               }
-               if (services.osmose) {
-                   var osmoseClosed = services.osmose.getClosedCounts();
-                   for (itemType in osmoseClosed) {
-                       tags['closed:osmose:' + itemType] = context.cleanTagValue(osmoseClosed[itemType].toString());
-                   }
-               }
+               _multiData = allValues.map(function (v) {
+                 return {
+                   key: v,
+                   value: displayValue(v),
+                   isMixed: !commonValues.includes(v)
+                 };
+               });
+               var currLength = utilUnicodeCharsCount(commonValues.join(';')); // limit the input length to the remaining available characters
 
-               // remove existing issue counts
-               for (var key in tags) {
-                   if (key.match(/(^warnings:)|(^resolved:)/)) {
-                       delete tags[key];
-                   }
-               }
+               maxLength = context.maxCharsForTagValue() - currLength;
 
-               function addIssueCounts(issues, prefix) {
-                   var issuesByType = utilArrayGroupBy(issues, 'type');
-                   for (var issueType in issuesByType) {
-                       var issuesOfType = issuesByType[issueType];
-                       if (issuesOfType[0].subtype) {
-                           var issuesBySubtype = utilArrayGroupBy(issuesOfType, 'subtype');
-                           for (var issueSubtype in issuesBySubtype) {
-                               var issuesOfSubtype = issuesBySubtype[issueSubtype];
-                               tags[prefix + ':' + issueType + ':' + issueSubtype] = context.cleanTagValue(issuesOfSubtype.length.toString());
-                           }
-                       } else {
-                           tags[prefix + ':' + issueType] = context.cleanTagValue(issuesOfType.length.toString());
-                       }
-                   }
+               if (currLength > 0) {
+                 // account for the separator if a new value will be appended to existing
+                 maxLength -= 1;
                }
+             } // a negative maxlength doesn't make sense
 
-               // add counts of warnings generated by the user's edits
-               var warnings = context.validator()
-                   .getIssuesBySeverity({ what: 'edited', where: 'all', includeIgnored: true, includeDisabledRules: true }).warning;
-               addIssueCounts(warnings, 'warnings');
-
-               // add counts of issues resolved by the user's edits
-               var resolvedIssues = context.validator().getResolvedIssues();
-               addIssueCounts(resolvedIssues, 'resolved');
-
-               context.changeset = context.changeset.update({ tags: tags });
-           }
-
-           function render(selection) {
-
-               var osm = context.connection();
-               if (!osm) return;
-
-               var header = selection.selectAll('.header')
-                   .data([0]);
-
-               var headerTitle = header.enter()
-                   .append('div')
-                   .attr('class', 'header fillL header-container');
-
-               headerTitle
-                   .append('div')
-                   .attr('class', 'header-block header-block-outer');
-
-               headerTitle
-                   .append('div')
-                   .attr('class', 'header-block')
-                   .append('h3')
-                   .text(_t('commit.title'));
 
-               headerTitle
-                   .append('div')
-                   .attr('class', 'header-block header-block-outer header-block-close')
-                   .append('button')
-                   .attr('class', 'close')
-                   .on('click', function() {
-                       dispatch$1.call('cancel', this);
-                   })
-                   .call(svgIcon('#iD-icon-close'));
-
-               var body = selection.selectAll('.body')
-                   .data([0]);
-
-               body = body.enter()
-                   .append('div')
-                   .attr('class', 'body')
-                   .merge(body);
+             maxLength = Math.max(0, maxLength);
+             var allowDragAndDrop = _isSemi // only semiCombo values are ordered
+             && !Array.isArray(tags[field.key]); // Exclude existing multikeys from combo options..
 
+             var available = objectDifference(_comboData, _multiData);
 
-               // Changeset Section
-               var changesetSection = body.selectAll('.changeset-editor')
-                   .data([0]);
+             _combobox.data(available); // Hide 'Add' button if this field uses fixed set of
+             // translateable _optstrings and they're all currently used,
+             // or if the field is already at its character limit
 
-               changesetSection = changesetSection.enter()
-                   .append('div')
-                   .attr('class', 'modal-section changeset-editor')
-                   .merge(changesetSection);
 
-               changesetSection
-                   .call(changesetEditor
-                       .changesetID(context.changeset.id)
-                       .tags(context.changeset.tags)
-                   );
+             var hideAdd = _optstrings && !available.length || maxLength <= 0;
 
+             _container.selectAll('.chiplist .input-wrap').style('display', hideAdd ? 'none' : null); // Render chips
 
-               // Warnings
-               body.call(commitWarnings);
 
+             var chips = _container.selectAll('.chip').data(_multiData);
 
-               // Upload Explanation
-               var saveSection = body.selectAll('.save-section')
-                   .data([0]);
+             chips.exit().remove();
+             var enter = chips.enter().insert('li', '.input-wrap').attr('class', 'chip');
+             enter.append('span');
+             enter.append('a');
+             chips = chips.merge(enter).order().classed('draggable', allowDragAndDrop).classed('mixed', function (d) {
+               return d.isMixed;
+             }).attr('title', function (d) {
+               return d.isMixed ? _t('inspector.unshared_value_tooltip') : null;
+             });
 
-               saveSection = saveSection.enter()
-                   .append('div')
-                   .attr('class','modal-section save-section fillL')
-                   .merge(saveSection);
+             if (allowDragAndDrop) {
+               registerDragAndDrop(chips);
+             }
 
-               var prose = saveSection.selectAll('.commit-info')
-                   .data([0]);
+             chips.select('span').html(function (d) {
+               return d.value;
+             });
+             chips.select('a').attr('href', '#').on('click', removeMultikey).attr('class', 'remove').html('×');
+           } else {
+             var isMixed = Array.isArray(tags[field.key]);
+             var mixedValues = isMixed && tags[field.key].map(function (val) {
+               return displayValue(val);
+             }).filter(Boolean);
+             utilGetSetValue(_input, !isMixed ? displayValue(tags[field.key]) : '').attr('title', isMixed ? mixedValues.join('\n') : undefined).attr('placeholder', isMixed ? _t('inspector.multiple_values') : _staticPlaceholder || '').classed('mixed', isMixed);
+           }
+         };
 
-               if (prose.enter().size()) {   // first time, make sure to update user details in prose
-                   _userDetails = null;
-               }
+         function registerDragAndDrop(selection) {
+           // allow drag and drop re-ordering of chips
+           var dragOrigin, targetIndex;
+           selection.call(d3_drag().on('start', function (d3_event) {
+             dragOrigin = {
+               x: d3_event.x,
+               y: d3_event.y
+             };
+             targetIndex = null;
+           }).on('drag', function (d3_event) {
+             var x = d3_event.x - dragOrigin.x,
+                 y = d3_event.y - dragOrigin.y;
+             if (!select(this).classed('dragging') && // don't display drag until dragging beyond a distance threshold
+             Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2)) <= 5) return;
+             var index = selection.nodes().indexOf(this);
+             select(this).classed('dragging', true);
+             targetIndex = null;
+             var targetIndexOffsetTop = null;
+             var draggedTagWidth = select(this).node().offsetWidth;
+
+             if (field.key === 'destination') {
+               // meaning tags are full width
+               _container.selectAll('.chip').style('transform', function (d2, index2) {
+                 var node = select(this).node();
+
+                 if (index === index2) {
+                   return 'translate(' + x + 'px, ' + y + 'px)'; // move the dragged tag up the order
+                 } else if (index2 > index && d3_event.y > node.offsetTop) {
+                   if (targetIndex === null || index2 > targetIndex) {
+                     targetIndex = index2;
+                   }
+
+                   return 'translateY(-100%)'; // move the dragged tag down the order
+                 } else if (index2 < index && d3_event.y < node.offsetTop + node.offsetHeight) {
+                   if (targetIndex === null || index2 < targetIndex) {
+                     targetIndex = index2;
+                   }
+
+                   return 'translateY(100%)';
+                 }
 
-               prose = prose.enter()
-                   .append('p')
-                   .attr('class', 'commit-info')
-                   .text(_t('commit.upload_explanation'))
-                   .merge(prose);
+                 return null;
+               });
+             } else {
+               _container.selectAll('.chip').each(function (d2, index2) {
+                 var node = select(this).node(); // check the cursor is in the bounding box
 
-               // always check if this has changed, but only update prose.html()
-               // if needed, because it can trigger a style recalculation
-               osm.userDetails(function(err, user) {
-                   if (err) return;
+                 if (index !== index2 && d3_event.x < node.offsetLeft + node.offsetWidth + 5 && d3_event.x > node.offsetLeft && d3_event.y < node.offsetTop + node.offsetHeight && d3_event.y > node.offsetTop) {
+                   targetIndex = index2;
+                   targetIndexOffsetTop = node.offsetTop;
+                 }
+               }).style('transform', function (d2, index2) {
+                 var node = select(this).node();
 
-                   if (_userDetails === user) return;  // no change
-                   _userDetails = user;
+                 if (index === index2) {
+                   return 'translate(' + x + 'px, ' + y + 'px)';
+                 } // only translate tags in the same row
 
-                   var userLink = select(document.createElement('div'));
 
-                   if (user.image_url) {
-                       userLink
-                           .append('img')
-                           .attr('src', user.image_url)
-                           .attr('class', 'icon pre-text user-icon');
+                 if (node.offsetTop === targetIndexOffsetTop) {
+                   if (index2 < index && index2 >= targetIndex) {
+                     return 'translateX(' + draggedTagWidth + 'px)';
+                   } else if (index2 > index && index2 <= targetIndex) {
+                     return 'translateX(-' + draggedTagWidth + 'px)';
                    }
+                 }
 
-                   userLink
-                       .append('a')
-                       .attr('class', 'user-info')
-                       .text(user.display_name)
-                       .attr('href', osm.userURL(user.display_name))
-                       .attr('target', '_blank');
-
-                   prose
-                       .html(_t('commit.upload_explanation_with_user', { user: userLink.html() }));
+                 return null;
                });
+             }
+           }).on('end', function () {
+             if (!select(this).classed('dragging')) {
+               return;
+             }
 
+             var index = selection.nodes().indexOf(this);
+             select(this).classed('dragging', false);
 
-               // Request Review
-               var requestReview = saveSection.selectAll('.request-review')
-                   .data([0]);
-
-               // Enter
-               var requestReviewEnter = requestReview.enter()
-                   .append('div')
-                   .attr('class', 'request-review');
-
-               var requestReviewDomId = utilUniqueDomId('commit-input-request-review');
+             _container.selectAll('.chip').style('transform', null);
 
-               var labelEnter = requestReviewEnter
-                   .append('label')
-                   .attr('for', requestReviewDomId);
+             if (typeof targetIndex === 'number') {
+               var element = _multiData[index];
 
-               labelEnter
-                   .append('input')
-                   .attr('type', 'checkbox')
-                   .attr('id', requestReviewDomId);
+               _multiData.splice(index, 1);
 
-               labelEnter
-                   .append('span')
-                   .text(_t('commit.request_review'));
+               _multiData.splice(targetIndex, 0, element);
 
-               // Update
-               requestReview = requestReview
-                   .merge(requestReviewEnter);
+               var t = {};
 
-               var requestReviewInput = requestReview.selectAll('input')
-                   .property('checked', isReviewRequested(context.changeset.tags))
-                   .on('change', toggleRequestReview);
+               if (_multiData.length) {
+                 t[field.key] = _multiData.map(function (element) {
+                   return element.key;
+                 }).join(';');
+               } else {
+                 t[field.key] = undefined;
+               }
 
+               dispatch$1.call('change', this, t);
+             }
 
-               // Buttons
-               var buttonSection = saveSection.selectAll('.buttons')
-                   .data([0]);
+             dragOrigin = undefined;
+             targetIndex = undefined;
+           }));
+         }
 
-               // enter
-               var buttonEnter = buttonSection.enter()
-                   .append('div')
-                   .attr('class', 'buttons fillL');
+         combo.focus = function () {
+           _input.node().focus();
+         };
 
-               buttonEnter
-                   .append('button')
-                   .attr('class', 'secondary-action button cancel-button')
-                   .append('span')
-                   .attr('class', 'label')
-                   .text(_t('commit.cancel'));
+         combo.entityIDs = function (val) {
+           if (!arguments.length) return _entityIDs;
+           _entityIDs = val;
+           return combo;
+         };
 
-               var uploadButton = buttonEnter
-                   .append('button')
-                   .attr('class', 'action button save-button');
+         function combinedEntityExtent() {
+           return _entityIDs && _entityIDs.length && utilTotalExtent(_entityIDs, context.graph());
+         }
 
-               uploadButton.append('span')
-                   .attr('class', 'label')
-                   .text(_t('commit.save'));
+         return utilRebind(combo, dispatch$1, 'on');
+       }
 
-               var uploadBlockerTooltipText = getUploadBlockerMessage();
+       function uiFieldText(field, context) {
+         var dispatch$1 = dispatch('change');
+         var input = select(null);
+         var outlinkButton = select(null);
+         var _entityIDs = [];
 
-               // update
-               buttonSection = buttonSection
-                   .merge(buttonEnter);
+         var _tags;
 
-               buttonSection.selectAll('.cancel-button')
-                   .on('click.cancel', function() {
-                       dispatch$1.call('cancel', this);
-                   });
+         var _phoneFormats = {};
 
-               buttonSection.selectAll('.save-button')
-                   .classed('disabled', uploadBlockerTooltipText !== null)
-                   .on('click.save', function() {
-                       if (!select(this).classed('disabled')) {
-                           this.blur();    // avoid keeping focus on the button - #4641
-                           context.uploader().save(context.changeset);
-                       }
-                   });
+         if (field.type === 'tel') {
+           _mainFileFetcher.get('phone_formats').then(function (d) {
+             _phoneFormats = d;
+             updatePhonePlaceholder();
+           })["catch"](function () {
+             /* ignore */
+           });
+         }
 
-               // remove any existing tooltip
-               uiTooltip().destroyAny(buttonSection.selectAll('.save-button'));
+         function i(selection) {
+           var entity = _entityIDs.length && context.hasEntity(_entityIDs[0]);
+           var preset = entity && _mainPresetIndex.match(entity, context.graph());
+           var isLocked = preset && preset.suggestion && field.id === 'brand';
+           field.locked(isLocked);
+           var wrap = selection.selectAll('.form-field-input-wrap').data([0]);
+           wrap = wrap.enter().append('div').attr('class', 'form-field-input-wrap form-field-input-' + field.type).merge(wrap);
+           input = wrap.selectAll('input').data([0]);
+           input = input.enter().append('input').attr('type', field.type === 'identifier' ? 'text' : field.type).attr('id', field.domId).classed(field.type, true).call(utilNoAuto).merge(input);
+           input.classed('disabled', !!isLocked).attr('readonly', isLocked || null).on('input', change(true)).on('blur', change()).on('change', change());
 
-               if (uploadBlockerTooltipText) {
-                   buttonSection.selectAll('.save-button')
-                       .call(uiTooltip().title(uploadBlockerTooltipText).placement('top'));
+           if (field.type === 'tel') {
+             updatePhonePlaceholder();
+           } else if (field.type === 'number') {
+             var rtl = _mainLocalizer.textDirection() === 'rtl';
+             input.attr('type', 'text');
+             var inc = field.increment;
+             var buttons = wrap.selectAll('.increment, .decrement').data(rtl ? [inc, -inc] : [-inc, inc]);
+             buttons.enter().append('button').attr('class', function (d) {
+               var which = d > 0 ? 'increment' : 'decrement';
+               return 'form-field-button ' + which;
+             }).merge(buttons).on('click', function (d3_event, d) {
+               d3_event.preventDefault();
+               var raw_vals = input.node().value || '0';
+               var vals = raw_vals.split(';');
+               vals = vals.map(function (v) {
+                 var num = parseFloat(v.trim(), 10);
+                 return isFinite(num) ? clamped(num + d) : v.trim();
+               });
+               input.node().value = vals.join(';');
+               change()();
+             });
+           } else if (field.type === 'identifier' && field.urlFormat && field.pattern) {
+             input.attr('type', 'text');
+             outlinkButton = wrap.selectAll('.foreign-id-permalink').data([0]);
+             outlinkButton.enter().append('button').call(svgIcon('#iD-icon-out-link')).attr('class', 'form-field-button foreign-id-permalink').attr('title', function () {
+               var domainResults = /^https?:\/\/(.{1,}?)\//.exec(field.urlFormat);
+
+               if (domainResults.length >= 2 && domainResults[1]) {
+                 var domain = domainResults[1];
+                 return _t('icons.view_on', {
+                   domain: domain
+                 });
                }
 
-               // Raw Tag Editor
-               var tagSection = body.selectAll('.tag-section.raw-tag-editor')
-                   .data([0]);
-
-               tagSection = tagSection.enter()
-                   .append('div')
-                   .attr('class', 'modal-section tag-section raw-tag-editor')
-                   .merge(tagSection);
-
-               tagSection
-                   .call(rawTagEditor
-                       .tags(Object.assign({}, context.changeset.tags))   // shallow copy
-                       .render
-                   );
-
-               var changesSection = body.selectAll('.commit-changes-section')
-                   .data([0]);
-
-               changesSection = changesSection.enter()
-                   .append('div')
-                   .attr('class', 'modal-section commit-changes-section')
-                   .merge(changesSection);
-
-               // Change summary
-               changesSection.call(commitChanges.render);
-
-
-               function toggleRequestReview() {
-                   var rr = requestReviewInput.property('checked');
-                   updateChangeset({ review_requested: (rr ? 'yes' : undefined) });
+               return '';
+             }).on('click', function (d3_event) {
+               d3_event.preventDefault();
+               var value = validIdentifierValueForLink();
 
-                   tagSection
-                       .call(rawTagEditor
-                           .tags(Object.assign({}, context.changeset.tags))   // shallow copy
-                           .render
-                       );
+               if (value) {
+                 var url = field.urlFormat.replace(/{value}/, encodeURIComponent(value));
+                 window.open(url, '_blank');
                }
+             }).merge(outlinkButton);
            }
+         }
 
+         function updatePhonePlaceholder() {
+           if (input.empty() || !Object.keys(_phoneFormats).length) return;
+           var extent = combinedEntityExtent();
+           var countryCode = extent && iso1A2Code(extent.center());
 
-           function getUploadBlockerMessage() {
-               var errors = context.validator()
-                   .getIssuesBySeverity({ what: 'edited', where: 'all' }).error;
+           var format = countryCode && _phoneFormats[countryCode.toLowerCase()];
 
-               if (errors.length) {
-                   return _t('commit.outstanding_errors_message', { count: errors.length });
+           if (format) input.attr('placeholder', format);
+         }
 
-               } else {
-                   var hasChangesetComment = context.changeset && context.changeset.tags.comment && context.changeset.tags.comment.trim().length;
-                   if (!hasChangesetComment) {
-                       return _t('commit.comment_needed_message');
-                   }
-               }
-               return null;
+         function validIdentifierValueForLink() {
+           if (field.type === 'identifier' && field.pattern) {
+             var value = utilGetSetValue(input).trim().split(';')[0];
+             return value && value.match(new RegExp(field.pattern));
            }
 
+           return null;
+         } // clamp number to min/max
 
-           function changeTags(_, changed, onInput) {
-               if (changed.hasOwnProperty('comment')) {
-                   if (changed.comment === undefined) {
-                       changed.comment = '';
-                   }
-                   if (!onInput) {
-                       corePreferences('comment', changed.comment);
-                       corePreferences('commentDate', Date.now());
-                   }
-               }
-               if (changed.hasOwnProperty('source')) {
-                   if (changed.source === undefined) {
-                       corePreferences('source', null);
-                   } else if (!onInput) {
-                       corePreferences('source', changed.source);
-                       corePreferences('commentDate', Date.now());
-                   }
-               }
-               // no need to update `prefs` for `hashtags` here since it's done in `updateChangeset`
-
-               updateChangeset(changed, onInput);
 
-               if (_selection) {
-                   _selection.call(render);
-               }
+         function clamped(num) {
+           if (field.minValue !== undefined) {
+             num = Math.max(num, field.minValue);
            }
 
+           if (field.maxValue !== undefined) {
+             num = Math.min(num, field.maxValue);
+           }
 
-           function findHashtags(tags, commentOnly) {
-               var detectedHashtags = commentHashtags();
-
-               if (detectedHashtags.length) {
-                   // always remove stored hashtags if there are hashtags in the comment - #4304
-                   corePreferences('hashtags', null);
-               }
-               if (!detectedHashtags.length || !commentOnly) {
-                   detectedHashtags = detectedHashtags.concat(hashtagHashtags());
-               }
+           return num;
+         }
 
-               var allLowerCase = new Set();
-               return detectedHashtags.filter(function(hashtag) {
-                   // Compare tags as lowercase strings, but keep original case tags
-                   var lowerCase = hashtag.toLowerCase();
-                   if (!allLowerCase.has(lowerCase)) {
-                       allLowerCase.add(lowerCase);
-                       return true;
-                   }
-                   return false;
-               });
+         function change(onInput) {
+           return function () {
+             var t = {};
+             var val = utilGetSetValue(input);
+             if (!onInput) val = context.cleanTagValue(val); // don't override multiple values with blank string
 
-               // Extract hashtags from `comment`
-               function commentHashtags() {
-                   var matches = (tags.comment || '')
-                       .replace(/http\S*/g, '')  // drop anything that looks like a URL - #4289
-                       .match(hashtagRegex);
+             if (!val && Array.isArray(_tags[field.key])) return;
 
-                   return matches || [];
+             if (!onInput) {
+               if (field.type === 'number' && val) {
+                 var vals = val.split(';');
+                 vals = vals.map(function (v) {
+                   var num = parseFloat(v.trim(), 10);
+                   return isFinite(num) ? clamped(num) : v.trim();
+                 });
+                 val = vals.join(';');
                }
 
-               // Extract and clean hashtags from `hashtags`
-               function hashtagHashtags() {
-                   var matches = (tags.hashtags || '')
-                       .split(/[,;\s]+/)
-                       .map(function (s) {
-                           if (s[0] !== '#') { s = '#' + s; }    // prepend '#'
-                           var matched = s.match(hashtagRegex);
-                           return matched && matched[0];
-                       }).filter(Boolean);                       // exclude falsy
-
-                   return matches || [];
-               }
-           }
+               utilGetSetValue(input, val);
+             }
 
+             t[field.key] = val || undefined;
+             dispatch$1.call('change', this, t, onInput);
+           };
+         }
 
-           function isReviewRequested(tags) {
-               var rr = tags.review_requested;
-               if (rr === undefined) return false;
-               rr = rr.trim().toLowerCase();
-               return !(rr === '' || rr === 'no');
-           }
+         i.entityIDs = function (val) {
+           if (!arguments.length) return _entityIDs;
+           _entityIDs = val;
+           return i;
+         };
 
+         i.tags = function (tags) {
+           _tags = tags;
+           var isMixed = Array.isArray(tags[field.key]);
+           utilGetSetValue(input, !isMixed && tags[field.key] ? tags[field.key] : '').attr('title', isMixed ? tags[field.key].filter(Boolean).join('\n') : undefined).attr('placeholder', isMixed ? _t('inspector.multiple_values') : field.placeholder() || _t('inspector.unknown')).classed('mixed', isMixed);
 
-           function updateChangeset(changed, onInput) {
-               var tags = Object.assign({}, context.changeset.tags);   // shallow copy
+           if (outlinkButton && !outlinkButton.empty()) {
+             var disabled = !validIdentifierValueForLink();
+             outlinkButton.classed('disabled', disabled);
+           }
+         };
 
-               Object.keys(changed).forEach(function(k) {
-                   var v = changed[k];
-                   k = context.cleanTagKey(k);
-                   if (readOnlyTags.indexOf(k) !== -1) return;
+         i.focus = function () {
+           var node = input.node();
+           if (node) node.focus();
+         };
 
-                   if (k !== '' && v !== undefined) {
-                       if (onInput) {
-                           tags[k] = v;
-                       } else {
-                           tags[k] = context.cleanTagValue(v);
-                       }
-                   } else {
-                       delete tags[k];
-                   }
-               });
+         function combinedEntityExtent() {
+           return _entityIDs && _entityIDs.length && utilTotalExtent(_entityIDs, context.graph());
+         }
 
-               if (!onInput) {
-                   // when changing the comment, override hashtags with any found in comment.
-                   var commentOnly = changed.hasOwnProperty('comment') && (changed.comment !== '');
-                   var arr = findHashtags(tags, commentOnly);
-                   if (arr.length) {
-                       tags.hashtags = context.cleanTagValue(arr.join(';'));
-                       corePreferences('hashtags', tags.hashtags);
-                   } else {
-                       delete tags.hashtags;
-                       corePreferences('hashtags', null);
-                   }
-               }
+         return utilRebind(i, dispatch$1, 'on');
+       }
 
-               // always update userdetails, just in case user reauthenticates as someone else
-               if (_userDetails && _userDetails.changesets_count !== undefined) {
-                   var changesetsCount = parseInt(_userDetails.changesets_count, 10) + 1;  // #4283
-                   tags.changesets_count = String(changesetsCount);
+       function uiFieldAccess(field, context) {
+         var dispatch$1 = dispatch('change');
+         var items = select(null);
 
-                   // first 100 edits - new user
-                   if (changesetsCount <= 100) {
-                       var s;
-                       s = corePreferences('walkthrough_completed');
-                       if (s) {
-                           tags['ideditor:walkthrough_completed'] = s;
-                       }
+         var _tags;
 
-                       s = corePreferences('walkthrough_progress');
-                       if (s) {
-                           tags['ideditor:walkthrough_progress'] = s;
-                       }
+         function access(selection) {
+           var wrap = selection.selectAll('.form-field-input-wrap').data([0]);
+           wrap = wrap.enter().append('div').attr('class', 'form-field-input-wrap form-field-input-' + field.type).merge(wrap);
+           var list = wrap.selectAll('ul').data([0]);
+           list = list.enter().append('ul').attr('class', 'rows').merge(list);
+           items = list.selectAll('li').data(field.keys); // Enter
 
-                       s = corePreferences('walkthrough_started');
-                       if (s) {
-                           tags['ideditor:walkthrough_started'] = s;
-                       }
-                   }
-               } else {
-                   delete tags.changesets_count;
-               }
+           var enter = items.enter().append('li').attr('class', function (d) {
+             return 'labeled-input preset-access-' + d;
+           });
+           enter.append('span').attr('class', 'label preset-label-access').attr('for', function (d) {
+             return 'preset-input-access-' + d;
+           }).html(function (d) {
+             return field.t.html('types.' + d);
+           });
+           enter.append('div').attr('class', 'preset-input-access-wrap').append('input').attr('type', 'text').attr('class', function (d) {
+             return 'preset-input-access preset-input-access-' + d;
+           }).call(utilNoAuto).each(function (d) {
+             select(this).call(uiCombobox(context, 'access-' + d).data(access.options(d)));
+           }); // Update
 
-               if (!fastDeepEqual(context.changeset.tags, tags)) {
-                   context.changeset = context.changeset.update({ tags: tags });
-               }
-           }
+           items = items.merge(enter);
+           wrap.selectAll('.preset-input-access').on('change', change).on('blur', change);
+         }
 
+         function change(d3_event, d) {
+           var tag = {};
+           var value = context.cleanTagValue(utilGetSetValue(select(this))); // don't override multiple values with blank string
 
-           commit.reset = function() {
-               context.changeset = null;
-           };
+           if (!value && typeof _tags[d] !== 'string') return;
+           tag[d] = value || undefined;
+           dispatch$1.call('change', this, tag);
+         }
 
+         access.options = function (type) {
+           var options = ['no', 'permissive', 'private', 'permit', 'destination'];
 
-           return utilRebind(commit, dispatch$1, 'on');
-       }
+           if (type !== 'access') {
+             options.unshift('yes');
+             options.push('designated');
 
-       var RADIUS = 6378137;
-       var FLATTENING = 1/298.257223563;
-       var POLAR_RADIUS$1 = 6356752.3142;
+             if (type === 'bicycle') {
+               options.push('dismount');
+             }
+           }
 
-       var wgs84 = {
-               RADIUS: RADIUS,
-               FLATTENING: FLATTENING,
-               POLAR_RADIUS: POLAR_RADIUS$1
-       };
+           return options.map(function (option) {
+             return {
+               title: field.t('options.' + option + '.description'),
+               value: option
+             };
+           });
+         };
 
-       var geometry_1 = geometry;
-       var ring = ringArea;
+         var placeholdersByHighway = {
+           footway: {
+             foot: 'designated',
+             motor_vehicle: 'no'
+           },
+           steps: {
+             foot: 'yes',
+             motor_vehicle: 'no',
+             bicycle: 'no',
+             horse: 'no'
+           },
+           pedestrian: {
+             foot: 'yes',
+             motor_vehicle: 'no'
+           },
+           cycleway: {
+             motor_vehicle: 'no',
+             bicycle: 'designated'
+           },
+           bridleway: {
+             motor_vehicle: 'no',
+             horse: 'designated'
+           },
+           path: {
+             foot: 'yes',
+             motor_vehicle: 'no',
+             bicycle: 'yes',
+             horse: 'yes'
+           },
+           motorway: {
+             foot: 'no',
+             motor_vehicle: 'yes',
+             bicycle: 'no',
+             horse: 'no'
+           },
+           trunk: {
+             motor_vehicle: 'yes'
+           },
+           primary: {
+             foot: 'yes',
+             motor_vehicle: 'yes',
+             bicycle: 'yes',
+             horse: 'yes'
+           },
+           secondary: {
+             foot: 'yes',
+             motor_vehicle: 'yes',
+             bicycle: 'yes',
+             horse: 'yes'
+           },
+           tertiary: {
+             foot: 'yes',
+             motor_vehicle: 'yes',
+             bicycle: 'yes',
+             horse: 'yes'
+           },
+           residential: {
+             foot: 'yes',
+             motor_vehicle: 'yes',
+             bicycle: 'yes',
+             horse: 'yes'
+           },
+           unclassified: {
+             foot: 'yes',
+             motor_vehicle: 'yes',
+             bicycle: 'yes',
+             horse: 'yes'
+           },
+           service: {
+             foot: 'yes',
+             motor_vehicle: 'yes',
+             bicycle: 'yes',
+             horse: 'yes'
+           },
+           motorway_link: {
+             foot: 'no',
+             motor_vehicle: 'yes',
+             bicycle: 'no',
+             horse: 'no'
+           },
+           trunk_link: {
+             motor_vehicle: 'yes'
+           },
+           primary_link: {
+             foot: 'yes',
+             motor_vehicle: 'yes',
+             bicycle: 'yes',
+             horse: 'yes'
+           },
+           secondary_link: {
+             foot: 'yes',
+             motor_vehicle: 'yes',
+             bicycle: 'yes',
+             horse: 'yes'
+           },
+           tertiary_link: {
+             foot: 'yes',
+             motor_vehicle: 'yes',
+             bicycle: 'yes',
+             horse: 'yes'
+           }
+         };
+
+         access.tags = function (tags) {
+           _tags = tags;
+           utilGetSetValue(items.selectAll('.preset-input-access'), function (d) {
+             return typeof tags[d] === 'string' ? tags[d] : '';
+           }).classed('mixed', function (d) {
+             return tags[d] && Array.isArray(tags[d]);
+           }).attr('title', function (d) {
+             return tags[d] && Array.isArray(tags[d]) && tags[d].filter(Boolean).join('\n');
+           }).attr('placeholder', function (d) {
+             if (tags[d] && Array.isArray(tags[d])) {
+               return _t('inspector.multiple_values');
+             }
 
-       function geometry(_) {
-           var area = 0, i;
-           switch (_.type) {
-               case 'Polygon':
-                   return polygonArea(_.coordinates);
-               case 'MultiPolygon':
-                   for (i = 0; i < _.coordinates.length; i++) {
-                       area += polygonArea(_.coordinates[i]);
-                   }
-                   return area;
-               case 'Point':
-               case 'MultiPoint':
-               case 'LineString':
-               case 'MultiLineString':
-                   return 0;
-               case 'GeometryCollection':
-                   for (i = 0; i < _.geometries.length; i++) {
-                       area += geometry(_.geometries[i]);
-                   }
-                   return area;
-           }
-       }
+             if (d === 'access') {
+               return 'yes';
+             }
 
-       function polygonArea(coords) {
-           var area = 0;
-           if (coords && coords.length > 0) {
-               area += Math.abs(ringArea(coords[0]));
-               for (var i = 1; i < coords.length; i++) {
-                   area -= Math.abs(ringArea(coords[i]));
-               }
-           }
-           return area;
-       }
+             if (tags.access && typeof tags.access === 'string') {
+               return tags.access;
+             }
 
-       /**
-        * Calculate the approximate area of the polygon were it projected onto
-        *     the earth.  Note that this area will be positive if ring is oriented
-        *     clockwise, otherwise it will be negative.
-        *
-        * Reference:
-        * Robert. G. Chamberlain and William H. Duquette, "Some Algorithms for
-        *     Polygons on a Sphere", JPL Publication 07-03, Jet Propulsion
-        *     Laboratory, Pasadena, CA, June 2007 http://trs-new.jpl.nasa.gov/dspace/handle/2014/40409
-        *
-        * Returns:
-        * {float} The approximate signed geodesic area of the polygon in square
-        *     meters.
-        */
+             if (tags.highway) {
+               if (typeof tags.highway === 'string') {
+                 if (placeholdersByHighway[tags.highway] && placeholdersByHighway[tags.highway][d]) {
+                   return placeholdersByHighway[tags.highway][d];
+                 }
+               } else {
+                 var impliedAccesses = tags.highway.filter(Boolean).map(function (highwayVal) {
+                   return placeholdersByHighway[highwayVal] && placeholdersByHighway[highwayVal][d];
+                 }).filter(Boolean);
 
-       function ringArea(coords) {
-           var p1, p2, p3, lowerIndex, middleIndex, upperIndex, i,
-           area = 0,
-           coordsLength = coords.length;
-
-           if (coordsLength > 2) {
-               for (i = 0; i < coordsLength; i++) {
-                   if (i === coordsLength - 2) {// i = N-2
-                       lowerIndex = coordsLength - 2;
-                       middleIndex = coordsLength -1;
-                       upperIndex = 0;
-                   } else if (i === coordsLength - 1) {// i = N-1
-                       lowerIndex = coordsLength - 1;
-                       middleIndex = 0;
-                       upperIndex = 1;
-                   } else { // i = 0 to N-3
-                       lowerIndex = i;
-                       middleIndex = i+1;
-                       upperIndex = i+2;
-                   }
-                   p1 = coords[lowerIndex];
-                   p2 = coords[middleIndex];
-                   p3 = coords[upperIndex];
-                   area += ( rad(p3[0]) - rad(p1[0]) ) * Math.sin( rad(p2[1]));
+                 if (impliedAccesses.length === tags.highway.length && new Set(impliedAccesses).size === 1) {
+                   // if all the highway values have the same implied access for this type then use that
+                   return impliedAccesses[0];
+                 }
                }
+             }
 
-               area = area * wgs84.RADIUS * wgs84.RADIUS / 2;
-           }
+             return field.placeholder();
+           });
+         };
 
-           return area;
-       }
+         access.focus = function () {
+           items.selectAll('.preset-input-access').node().focus();
+         };
 
-       function rad(_) {
-           return _ * Math.PI / 180;
+         return utilRebind(access, dispatch$1, 'on');
        }
 
-       var geojsonArea = {
-               geometry: geometry_1,
-               ring: ring
-       };
+       function uiFieldAddress(field, context) {
+         var dispatch$1 = dispatch('change');
 
-       function toRadians(angleInDegrees) {
-         return (angleInDegrees * Math.PI) / 180;
-       }
+         var _selection = select(null);
 
-       function toDegrees(angleInRadians) {
-         return (angleInRadians * 180) / Math.PI;
-       }
+         var _wrap = select(null);
 
-       function offset(c1, distance, bearing) {
-         var lat1 = toRadians(c1[1]);
-         var lon1 = toRadians(c1[0]);
-         var dByR = distance / 6378137; // distance divided by 6378137 (radius of the earth) wgs84
-         var lat = Math.asin(
-           Math.sin(lat1) * Math.cos(dByR) +
-             Math.cos(lat1) * Math.sin(dByR) * Math.cos(bearing)
-         );
-         var lon =
-           lon1 +
-           Math.atan2(
-             Math.sin(bearing) * Math.sin(dByR) * Math.cos(lat1),
-             Math.cos(dByR) - Math.sin(lat1) * Math.sin(lat)
-           );
-         return [toDegrees(lon), toDegrees(lat)];
-       }
+         var addrField = _mainPresetIndex.field('address'); // needed for placeholder strings
 
-       function validateCenter(center) {
-         const validCenterLengths = [2, 3];
-         if (!Array.isArray(center) || !validCenterLengths.includes(center.length)) {
-           throw new Error("ERROR! Center has to be an array of length two or three");
-         }
-         const [lng, lat] = center;
-         if (typeof lng !== "number" || typeof lat !== "number") {
-           throw new Error(
-             `ERROR! Longitude and Latitude has to be numbers but where ${typeof lng} and ${typeof lat}`
-           );
-         }
-         if (lng > 180 || lng < -180) {
-           throw new Error(
-             `ERROR! Longitude has to be between -180 and 180 but was ${lng}`
-           );
-         }
+         var _entityIDs = [];
 
-         if (lat > 90 || lat < -90) {
-           throw new Error(
-             `ERROR! Latitude has to be between -90 and 90 but was ${lat}`
-           );
-         }
-       }
+         var _tags;
 
-       function validateRadius(radius) {
-         if (typeof radius !== "number") {
-           throw new Error(
-             `ERROR! Radius has to be a positive number but was: ${typeof radius}`
-           );
-         }
+         var _countryCode;
 
-         if (radius <= 0) {
-           throw new Error(
-             `ERROR! Radius has to be a positive number but was: ${radius}`
-           );
-         }
-       }
+         var _addressFormats = [{
+           format: [['housenumber', 'street'], ['city', 'postcode']]
+         }];
+         _mainFileFetcher.get('address_formats').then(function (d) {
+           _addressFormats = d;
 
-       function validateNumberOfSegments(numberOfSegments) {
-         if (typeof numberOfSegments !== "number" && numberOfSegments !== undefined) {
-           throw new Error(
-             `ERROR! Number of segments has to be a number but was: ${typeof numberOfSegments}`
-           );
-         }
+           if (!_selection.empty()) {
+             _selection.call(address);
+           }
+         })["catch"](function () {
+           /* ignore */
+         });
 
-         if (numberOfSegments < 3) {
-           throw new Error(
-             `ERROR! Number of segments has to be at least 3 but was: ${numberOfSegments}`
-           );
+         function getNearStreets() {
+           var extent = combinedEntityExtent();
+           var l = extent.center();
+           var box = geoExtent(l).padByMeters(200);
+           var streets = context.history().intersects(box).filter(isAddressable).map(function (d) {
+             var loc = context.projection([(extent[0][0] + extent[1][0]) / 2, (extent[0][1] + extent[1][1]) / 2]);
+             var choice = geoChooseEdge(context.graph().childNodes(d), loc, context.projection);
+             return {
+               title: d.tags.name,
+               value: d.tags.name,
+               dist: choice.distance
+             };
+           }).sort(function (a, b) {
+             return a.dist - b.dist;
+           });
+           return utilArrayUniqBy(streets, 'value');
+
+           function isAddressable(d) {
+             return d.tags.highway && d.tags.name && d.type === 'way';
+           }
          }
-       }
 
-       function validateInput({ center, radius, numberOfSegments }) {
-         validateCenter(center);
-         validateRadius(radius);
-         validateNumberOfSegments(numberOfSegments);
-       }
+         function getNearCities() {
+           var extent = combinedEntityExtent();
+           var l = extent.center();
+           var box = geoExtent(l).padByMeters(200);
+           var cities = context.history().intersects(box).filter(isAddressable).map(function (d) {
+             return {
+               title: d.tags['addr:city'] || d.tags.name,
+               value: d.tags['addr:city'] || d.tags.name,
+               dist: geoSphericalDistance(d.extent(context.graph()).center(), l)
+             };
+           }).sort(function (a, b) {
+             return a.dist - b.dist;
+           });
+           return utilArrayUniqBy(cities, 'value');
 
-       var circleToPolygon = function circleToPolygon(center, radius, numberOfSegments) {
-         var n = numberOfSegments ? numberOfSegments : 32;
+           function isAddressable(d) {
+             if (d.tags.name) {
+               if (d.tags.admin_level === '8' && d.tags.boundary === 'administrative') return true;
+               if (d.tags.border_type === 'city') return true;
+               if (d.tags.place === 'city' || d.tags.place === 'town' || d.tags.place === 'village') return true;
+             }
 
-         // validateInput() throws error on invalid input and do nothing on valid input
-         validateInput({ center, radius, numberOfSegments });
+             if (d.tags['addr:city']) return true;
+             return false;
+           }
+         }
 
-         var coordinates = [];
-         for (var i = 0; i < n; ++i) {
-           coordinates.push(offset(center, radius, (2 * Math.PI * -i) / n));
+         function getNearValues(key) {
+           var extent = combinedEntityExtent();
+           var l = extent.center();
+           var box = geoExtent(l).padByMeters(200);
+           var results = context.history().intersects(box).filter(function hasTag(d) {
+             return _entityIDs.indexOf(d.id) === -1 && d.tags[key];
+           }).map(function (d) {
+             return {
+               title: d.tags[key],
+               value: d.tags[key],
+               dist: geoSphericalDistance(d.extent(context.graph()).center(), l)
+             };
+           }).sort(function (a, b) {
+             return a.dist - b.dist;
+           });
+           return utilArrayUniqBy(results, 'value');
          }
-         coordinates.push(coordinates[0]);
 
-         return {
-           type: "Polygon",
-           coordinates: [coordinates]
-         };
-       };
+         function updateForCountryCode() {
+           if (!_countryCode) return;
+           var addressFormat;
 
-       var geojsonPrecision = createCommonjsModule(function (module) {
-       (function() {
+           for (var i = 0; i < _addressFormats.length; i++) {
+             var format = _addressFormats[i];
 
-         function parse(t, coordinatePrecision, extrasPrecision) {
+             if (!format.countryCodes) {
+               addressFormat = format; // choose the default format, keep going
+             } else if (format.countryCodes.indexOf(_countryCode) !== -1) {
+               addressFormat = format; // choose the country format, stop here
 
-           function point(p) {
-             return p.map(function(e, index) {
-               if (index < 2) {
-                   return 1 * e.toFixed(coordinatePrecision);
-               } else {
-                   return 1 * e.toFixed(extrasPrecision);
-               }
-             });
+               break;
+             }
            }
 
-           function multi(l) {
-             return l.map(point);
-           }
+           var dropdowns = addressFormat.dropdowns || ['city', 'county', 'country', 'district', 'hamlet', 'neighbourhood', 'place', 'postcode', 'province', 'quarter', 'state', 'street', 'subdistrict', 'suburb'];
+           var widths = addressFormat.widths || {
+             housenumber: 1 / 3,
+             street: 2 / 3,
+             city: 2 / 3,
+             state: 1 / 4,
+             postcode: 1 / 3
+           };
 
-           function poly(p) {
-             return p.map(multi);
+           function row(r) {
+             // Normalize widths.
+             var total = r.reduce(function (sum, key) {
+               return sum + (widths[key] || 0.5);
+             }, 0);
+             return r.map(function (key) {
+               return {
+                 id: key,
+                 width: (widths[key] || 0.5) / total
+               };
+             });
            }
 
-           function multiPoly(m) {
-             return m.map(poly);
-           }
+           var rows = _wrap.selectAll('.addr-row').data(addressFormat.format, function (d) {
+             return d.toString();
+           });
 
-           function geometry(obj) {
-             if (!obj) {
-               return {};
-             }
-             
-             switch (obj.type) {
-               case "Point":
-                 obj.coordinates = point(obj.coordinates);
-                 return obj;
-               case "LineString":
-               case "MultiPoint":
-                 obj.coordinates = multi(obj.coordinates);
-                 return obj;
-               case "Polygon":
-               case "MultiLineString":
-                 obj.coordinates = poly(obj.coordinates);
-                 return obj;
-               case "MultiPolygon":
-                 obj.coordinates = multiPoly(obj.coordinates);
-                 return obj;
-               case "GeometryCollection":
-                 obj.geometries = obj.geometries.map(geometry);
-                 return obj;
-               default :
-                 return {};
-             }
-           }
+           rows.exit().remove();
+           rows.enter().append('div').attr('class', 'addr-row').selectAll('input').data(row).enter().append('input').property('type', 'text').call(updatePlaceholder).attr('class', function (d) {
+             return 'addr-' + d.id;
+           }).call(utilNoAuto).each(addDropdown).style('width', function (d) {
+             return d.width * 100 + '%';
+           });
 
-           function feature(obj) {
-             obj.geometry = geometry(obj.geometry);
-             return obj
-           }
+           function addDropdown(d) {
+             if (dropdowns.indexOf(d.id) === -1) return; // not a dropdown
 
-           function featureCollection(f) {
-             f.features = f.features.map(feature);
-             return f;
+             var nearValues = d.id === 'street' ? getNearStreets : d.id === 'city' ? getNearCities : getNearValues;
+             select(this).call(uiCombobox(context, 'address-' + d.id).minItems(1).caseSensitive(true).fetcher(function (value, callback) {
+               callback(nearValues('addr:' + d.id));
+             }));
            }
 
-           function geometryCollection(g) {
-             g.geometries = g.geometries.map(geometry);
-             return g;
-           }
+           _wrap.selectAll('input').on('blur', change()).on('change', change());
 
-           if (!t) {
-             return t;
-           }
+           _wrap.selectAll('input:not(.combobox-input)').on('input', change(true));
 
-           switch (t.type) {
-             case "Feature":
-               return feature(t);
-             case "GeometryCollection" :
-               return geometryCollection(t);
-             case "FeatureCollection" :
-               return featureCollection(t);
-             case "Point":
-             case "LineString":
-             case "Polygon":
-             case "MultiPoint":
-             case "MultiPolygon":
-             case "MultiLineString":
-               return geometry(t);
-             default :
-               return t;
-           }
-             
+           if (_tags) updateTags(_tags);
          }
 
-         module.exports = parse;
-         module.exports.parse = parse;
+         function address(selection) {
+           _selection = selection;
+           _wrap = selection.selectAll('.form-field-input-wrap').data([0]);
+           _wrap = _wrap.enter().append('div').attr('class', 'form-field-input-wrap form-field-input-' + field.type).merge(_wrap);
+           var extent = combinedEntityExtent();
 
-       }());
-       });
+           if (extent) {
+             var countryCode;
 
-       /* Polyfill service v3.13.0
-        * For detailed credits and licence information see http://github.com/financial-times/polyfill-service
-        *
-        * - Array.prototype.fill, License: CC0 */
+             if (context.inIntro()) {
+               // localize the address format for the walkthrough
+               countryCode = _t('intro.graph.countrycode');
+             } else {
+               var center = extent.center();
+               countryCode = iso1A2Code(center);
+             }
 
-       if (!('fill' in Array.prototype)) {
-         Object.defineProperty(Array.prototype, 'fill', {
-           configurable: true,
-           value: function fill (value) {
-             if (this === undefined || this === null) {
-               throw new TypeError(this + ' is not an object')
+             if (countryCode) {
+               _countryCode = countryCode.toLowerCase();
+               updateForCountryCode();
              }
+           }
+         }
 
-             var arrayLike = Object(this);
+         function change(onInput) {
+           return function () {
+             var tags = {};
 
-             var length = Math.max(Math.min(arrayLike.length, 9007199254740991), 0) || 0;
+             _wrap.selectAll('input').each(function (subfield) {
+               var key = field.key + ':' + subfield.id;
+               var value = this.value;
+               if (!onInput) value = context.cleanTagValue(value); // don't override multiple values with blank string
 
-             var relativeStart = 1 in arguments ? parseInt(Number(arguments[1]), 10) || 0 : 0;
+               if (Array.isArray(_tags[key]) && !value) return;
+               tags[key] = value || undefined;
+             });
 
-             relativeStart = relativeStart < 0 ? Math.max(length + relativeStart, 0) : Math.min(relativeStart, length);
+             dispatch$1.call('change', this, tags, onInput);
+           };
+         }
 
-             var relativeEnd = 2 in arguments && arguments[2] !== undefined ? parseInt(Number(arguments[2]), 10) || 0 : length;
+         function updatePlaceholder(inputSelection) {
+           return inputSelection.attr('placeholder', function (subfield) {
+             if (_tags && Array.isArray(_tags[field.key + ':' + subfield.id])) {
+               return _t('inspector.multiple_values');
+             }
 
-             relativeEnd = relativeEnd < 0 ? Math.max(length + arguments[2], 0) : Math.min(relativeEnd, length);
+             if (_countryCode) {
+               var localkey = subfield.id + '!' + _countryCode;
+               var tkey = addrField.strings.placeholders[localkey] ? localkey : subfield.id;
+               return addrField.t('placeholders.' + tkey);
+             }
+           });
+         }
 
-             while (relativeStart < relativeEnd) {
-               arrayLike[relativeStart] = value;
+         function updateTags(tags) {
+           utilGetSetValue(_wrap.selectAll('input'), function (subfield) {
+             var val = tags[field.key + ':' + subfield.id];
+             return typeof val === 'string' ? val : '';
+           }).attr('title', function (subfield) {
+             var val = tags[field.key + ':' + subfield.id];
+             return val && Array.isArray(val) && val.filter(Boolean).join('\n');
+           }).classed('mixed', function (subfield) {
+             return Array.isArray(tags[field.key + ':' + subfield.id]);
+           }).call(updatePlaceholder);
+         }
 
-               ++relativeStart;
-             }
+         function combinedEntityExtent() {
+           return _entityIDs && _entityIDs.length && utilTotalExtent(_entityIDs, context.graph());
+         }
 
-             return arrayLike
-           },
-           writable: true
-         });
-       }
+         address.entityIDs = function (val) {
+           if (!arguments.length) return _entityIDs;
+           _entityIDs = val;
+           return address;
+         };
 
-       /**
-        * Polyfill for IE support
-        */
-       Number.isFinite = Number.isFinite || function (value) {
-         return typeof value === 'number' && isFinite(value)
-       };
+         address.tags = function (tags) {
+           _tags = tags;
+           updateTags(tags);
+         };
 
-       Number.isInteger = Number.isInteger || function (val) {
-         return typeof val === 'number' &&
-         isFinite(val) &&
-         Math.floor(val) === val
-       };
+         address.focus = function () {
+           var node = _wrap.selectAll('input').node();
 
-       Number.parseFloat = Number.parseFloat || parseFloat;
+           if (node) node.focus();
+         };
 
-       Number.isNaN = Number.isNaN || function (value) {
-         return value !== value // eslint-disable-line
-       };
+         return utilRebind(address, dispatch$1, 'on');
+       }
 
-       /**
-        * Polyfill for IE support
-        */
-       Math.trunc = Math.trunc || function (x) {
-         return x < 0 ? Math.ceil(x) : Math.floor(x)
-       };
+       function uiFieldCycleway(field, context) {
+         var dispatch$1 = dispatch('change');
+         var items = select(null);
+         var wrap = select(null);
 
-       var NumberUtil = function NumberUtil () {};
+         var _tags;
 
-       NumberUtil.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       NumberUtil.prototype.getClass = function getClass () {
-         return NumberUtil
-       };
-       NumberUtil.prototype.equalsWithTolerance = function equalsWithTolerance (x1, x2, tolerance) {
-         return Math.abs(x1 - x2) <= tolerance
-       };
+         function cycleway(selection) {
+           function stripcolon(s) {
+             return s.replace(':', '');
+           }
 
-       var IllegalArgumentException = (function (Error) {
-               function IllegalArgumentException (message) {
-                       Error.call(this, message);
-                       this.name = 'IllegalArgumentException';
-                       this.message = message;
-                       this.stack = (new Error()).stack;
-               }
-
-               if ( Error ) IllegalArgumentException.__proto__ = Error;
-               IllegalArgumentException.prototype = Object.create( Error && Error.prototype );
-               IllegalArgumentException.prototype.constructor = IllegalArgumentException;
-
-               return IllegalArgumentException;
-       }(Error));
-
-       var Double = function Double () {};
-
-       var staticAccessors$1 = { MAX_VALUE: { configurable: true } };
-
-       Double.isNaN = function isNaN (n) { return Number.isNaN(n) };
-       Double.doubleToLongBits = function doubleToLongBits (n) { return n };
-       Double.longBitsToDouble = function longBitsToDouble (n) { return n };
-       Double.isInfinite = function isInfinite (n) { return !Number.isFinite(n) };
-       staticAccessors$1.MAX_VALUE.get = function () { return Number.MAX_VALUE };
-
-       Object.defineProperties( Double, staticAccessors$1 );
-
-       var Comparable = function Comparable () {};
-
-       var Clonable = function Clonable () {};
-
-       var Comparator = function Comparator () {};
-
-       function Serializable () {}
-
-       // import Assert from '../util/Assert'
-
-       var Coordinate = function Coordinate () {
-         this.x = null;
-         this.y = null;
-         this.z = null;
-         if (arguments.length === 0) {
-           this.x = 0.0;
-           this.y = 0.0;
-           this.z = Coordinate.NULL_ORDINATE;
-         } else if (arguments.length === 1) {
-           var c = arguments[0];
-           this.x = c.x;
-           this.y = c.y;
-           this.z = c.z;
-         } else if (arguments.length === 2) {
-           this.x = arguments[0];
-           this.y = arguments[1];
-           this.z = Coordinate.NULL_ORDINATE;
-         } else if (arguments.length === 3) {
-           this.x = arguments[0];
-           this.y = arguments[1];
-           this.z = arguments[2];
-         }
-       };
+           wrap = selection.selectAll('.form-field-input-wrap').data([0]);
+           wrap = wrap.enter().append('div').attr('class', 'form-field-input-wrap form-field-input-' + field.type).merge(wrap);
+           var div = wrap.selectAll('ul').data([0]);
+           div = div.enter().append('ul').attr('class', 'rows').merge(div);
+           var keys = ['cycleway:left', 'cycleway:right'];
+           items = div.selectAll('li').data(keys);
+           var enter = items.enter().append('li').attr('class', function (d) {
+             return 'labeled-input preset-cycleway-' + stripcolon(d);
+           });
+           enter.append('span').attr('class', 'label preset-label-cycleway').attr('for', function (d) {
+             return 'preset-input-cycleway-' + stripcolon(d);
+           }).html(function (d) {
+             return field.t.html('types.' + d);
+           });
+           enter.append('div').attr('class', 'preset-input-cycleway-wrap').append('input').attr('type', 'text').attr('class', function (d) {
+             return 'preset-input-cycleway preset-input-' + stripcolon(d);
+           }).call(utilNoAuto).each(function (d) {
+             select(this).call(uiCombobox(context, 'cycleway-' + stripcolon(d)).data(cycleway.options(d)));
+           });
+           items = items.merge(enter); // Update
 
-       var staticAccessors = { DimensionalComparator: { configurable: true },serialVersionUID: { configurable: true },NULL_ORDINATE: { configurable: true },X: { configurable: true },Y: { configurable: true },Z: { configurable: true } };
-       Coordinate.prototype.setOrdinate = function setOrdinate (ordinateIndex, value) {
-         switch (ordinateIndex) {
-           case Coordinate.X:
-             this.x = value;
-             break
-           case Coordinate.Y:
-             this.y = value;
-             break
-           case Coordinate.Z:
-             this.z = value;
-             break
-           default:
-             throw new IllegalArgumentException('Invalid ordinate index: ' + ordinateIndex)
+           wrap.selectAll('.preset-input-cycleway').on('change', change).on('blur', change);
          }
-       };
-       Coordinate.prototype.equals2D = function equals2D () {
-         if (arguments.length === 1) {
-           var other = arguments[0];
-           if (this.x !== other.x) {
-             return false
+
+         function change(d3_event, key) {
+           var newValue = context.cleanTagValue(utilGetSetValue(select(this))); // don't override multiple values with blank string
+
+           if (!newValue && (Array.isArray(_tags.cycleway) || Array.isArray(_tags[key]))) return;
+
+           if (newValue === 'none' || newValue === '') {
+             newValue = undefined;
            }
-           if (this.y !== other.y) {
-             return false
+
+           var otherKey = key === 'cycleway:left' ? 'cycleway:right' : 'cycleway:left';
+           var otherValue = typeof _tags.cycleway === 'string' ? _tags.cycleway : _tags[otherKey];
+
+           if (otherValue && Array.isArray(otherValue)) {
+             // we must always have an explicit value for comparison
+             otherValue = otherValue[0];
            }
-           return true
-         } else if (arguments.length === 2) {
-           var c = arguments[0];
-           var tolerance = arguments[1];
-           if (!NumberUtil.equalsWithTolerance(this.x, c.x, tolerance)) {
-             return false
+
+           if (otherValue === 'none' || otherValue === '') {
+             otherValue = undefined;
            }
-           if (!NumberUtil.equalsWithTolerance(this.y, c.y, tolerance)) {
-             return false
+
+           var tag = {}; // If the left and right tags match, use the cycleway tag to tag both
+           // sides the same way
+
+           if (newValue === otherValue) {
+             tag = {
+               cycleway: newValue,
+               'cycleway:left': undefined,
+               'cycleway:right': undefined
+             };
+           } else {
+             // Always set both left and right as changing one can affect the other
+             tag = {
+               cycleway: undefined
+             };
+             tag[key] = newValue;
+             tag[otherKey] = otherValue;
            }
-           return true
-         }
-       };
-       Coordinate.prototype.getOrdinate = function getOrdinate (ordinateIndex) {
-         switch (ordinateIndex) {
-           case Coordinate.X:
-             return this.x
-           case Coordinate.Y:
-             return this.y
-           case Coordinate.Z:
-             return this.z
-         }
-         throw new IllegalArgumentException('Invalid ordinate index: ' + ordinateIndex)
-       };
-       Coordinate.prototype.equals3D = function equals3D (other) {
-         return this.x === other.x &&
-                this.y === other.y &&
-                ((this.z === other.z || Double.isNaN(this.z)) &&
-                Double.isNaN(other.z))
-       };
-       Coordinate.prototype.equals = function equals (other) {
-         if (!(other instanceof Coordinate)) {
-           return false
-         }
-         return this.equals2D(other)
-       };
-       Coordinate.prototype.equalInZ = function equalInZ (c, tolerance) {
-         return NumberUtil.equalsWithTolerance(this.z, c.z, tolerance)
-       };
-       Coordinate.prototype.compareTo = function compareTo (o) {
-         var other = o;
-         if (this.x < other.x) { return -1 }
-         if (this.x > other.x) { return 1 }
-         if (this.y < other.y) { return -1 }
-         if (this.y > other.y) { return 1 }
-         return 0
-       };
-       Coordinate.prototype.clone = function clone () {
-         // try {
-         // var coord = null
-         // return coord
-         // } catch (e) {
-         // if (e instanceof CloneNotSupportedException) {
-         //   Assert.shouldNeverReachHere("this shouldn't happen because this class is Cloneable")
-         //   return null
-         // } else throw e
-         // } finally {}
-       };
-       Coordinate.prototype.copy = function copy () {
-         return new Coordinate(this)
-       };
-       Coordinate.prototype.toString = function toString () {
-         return '(' + this.x + ', ' + this.y + ', ' + this.z + ')'
-       };
-       Coordinate.prototype.distance3D = function distance3D (c) {
-         var dx = this.x - c.x;
-         var dy = this.y - c.y;
-         var dz = this.z - c.z;
-         return Math.sqrt(dx * dx + dy * dy + dz * dz)
-       };
-       Coordinate.prototype.distance = function distance (c) {
-         var dx = this.x - c.x;
-         var dy = this.y - c.y;
-         return Math.sqrt(dx * dx + dy * dy)
-       };
-       Coordinate.prototype.hashCode = function hashCode () {
-         var result = 17;
-         result = 37 * result + Coordinate.hashCode(this.x);
-         result = 37 * result + Coordinate.hashCode(this.y);
-         return result
-       };
-       Coordinate.prototype.setCoordinate = function setCoordinate (other) {
-         this.x = other.x;
-         this.y = other.y;
-         this.z = other.z;
-       };
-       Coordinate.prototype.interfaces_ = function interfaces_ () {
-         return [Comparable, Clonable, Serializable]
-       };
-       Coordinate.prototype.getClass = function getClass () {
-         return Coordinate
-       };
-       Coordinate.hashCode = function hashCode () {
-         if (arguments.length === 1) {
-           var x = arguments[0];
-           var f = Double.doubleToLongBits(x);
-           return Math.trunc((f ^ f) >>> 32)
-         }
-       };
-       staticAccessors.DimensionalComparator.get = function () { return DimensionalComparator };
-       staticAccessors.serialVersionUID.get = function () { return 6683108902428366910 };
-       staticAccessors.NULL_ORDINATE.get = function () { return Double.NaN };
-       staticAccessors.X.get = function () { return 0 };
-       staticAccessors.Y.get = function () { return 1 };
-       staticAccessors.Z.get = function () { return 2 };
-
-       Object.defineProperties( Coordinate, staticAccessors );
-
-       var DimensionalComparator = function DimensionalComparator (dimensionsToTest) {
-         this._dimensionsToTest = 2;
-         if (arguments.length === 0) ; else if (arguments.length === 1) {
-           var dimensionsToTest$1 = arguments[0];
-           if (dimensionsToTest$1 !== 2 && dimensionsToTest$1 !== 3) { throw new IllegalArgumentException('only 2 or 3 dimensions may be specified') }
-           this._dimensionsToTest = dimensionsToTest$1;
+
+           dispatch$1.call('change', this, tag);
          }
-       };
-       DimensionalComparator.prototype.compare = function compare (o1, o2) {
-         var c1 = o1;
-         var c2 = o2;
-         var compX = DimensionalComparator.compare(c1.x, c2.x);
-         if (compX !== 0) { return compX }
-         var compY = DimensionalComparator.compare(c1.y, c2.y);
-         if (compY !== 0) { return compY }
-         if (this._dimensionsToTest <= 2) { return 0 }
-         var compZ = DimensionalComparator.compare(c1.z, c2.z);
-         return compZ
-       };
-       DimensionalComparator.prototype.interfaces_ = function interfaces_ () {
-         return [Comparator]
-       };
-       DimensionalComparator.prototype.getClass = function getClass () {
-         return DimensionalComparator
-       };
-       DimensionalComparator.compare = function compare (a, b) {
-         if (a < b) { return -1 }
-         if (a > b) { return 1 }
-         if (Double.isNaN(a)) {
-           if (Double.isNaN(b)) { return 0 }
-           return -1
-         }
-         if (Double.isNaN(b)) { return 1 }
-         return 0
-       };
 
-       // import hasInterface from '../../../../hasInterface'
-       // import CoordinateSequence from './CoordinateSequence'
+         cycleway.options = function () {
+           return Object.keys(field.strings.options).map(function (option) {
+             return {
+               title: field.t('options.' + option + '.description'),
+               value: option
+             };
+           });
+         };
 
-       var CoordinateSequenceFactory = function CoordinateSequenceFactory () {};
+         cycleway.tags = function (tags) {
+           _tags = tags; // If cycleway is set, use that instead of individual values
 
-       CoordinateSequenceFactory.prototype.create = function create () {
-         // if (arguments.length === 1) {
-         // if (arguments[0] instanceof Array) {
-         //   let coordinates = arguments[0]
-         // } else if (hasInterface(arguments[0], CoordinateSequence)) {
-         //   let coordSeq = arguments[0]
-         // }
-         // } else if (arguments.length === 2) {
-         // let size = arguments[0]
-         // let dimension = arguments[1]
-         // }
-       };
-       CoordinateSequenceFactory.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       CoordinateSequenceFactory.prototype.getClass = function getClass () {
-         return CoordinateSequenceFactory
-       };
+           var commonValue = typeof tags.cycleway === 'string' && tags.cycleway;
+           utilGetSetValue(items.selectAll('.preset-input-cycleway'), function (d) {
+             if (commonValue) return commonValue;
+             return !tags.cycleway && typeof tags[d] === 'string' ? tags[d] : '';
+           }).attr('title', function (d) {
+             if (Array.isArray(tags.cycleway) || Array.isArray(tags[d])) {
+               var vals = [];
 
-       var Location = function Location () {};
+               if (Array.isArray(tags.cycleway)) {
+                 vals = vals.concat(tags.cycleway);
+               }
 
-       var staticAccessors$4 = { INTERIOR: { configurable: true },BOUNDARY: { configurable: true },EXTERIOR: { configurable: true },NONE: { configurable: true } };
+               if (Array.isArray(tags[d])) {
+                 vals = vals.concat(tags[d]);
+               }
 
-       Location.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       Location.prototype.getClass = function getClass () {
-         return Location
-       };
-       Location.toLocationSymbol = function toLocationSymbol (locationValue) {
-         switch (locationValue) {
-           case Location.EXTERIOR:
-             return 'e'
-           case Location.BOUNDARY:
-             return 'b'
-           case Location.INTERIOR:
-             return 'i'
-           case Location.NONE:
-             return '-'
-         }
-         throw new IllegalArgumentException('Unknown location value: ' + locationValue)
-       };
-       staticAccessors$4.INTERIOR.get = function () { return 0 };
-       staticAccessors$4.BOUNDARY.get = function () { return 1 };
-       staticAccessors$4.EXTERIOR.get = function () { return 2 };
-       staticAccessors$4.NONE.get = function () { return -1 };
+               return vals.filter(Boolean).join('\n');
+             }
 
-       Object.defineProperties( Location, staticAccessors$4 );
+             return null;
+           }).attr('placeholder', function (d) {
+             if (Array.isArray(tags.cycleway) || Array.isArray(tags[d])) {
+               return _t('inspector.multiple_values');
+             }
 
-       var hasInterface = function (o, i) {
-         return o.interfaces_ && o.interfaces_().indexOf(i) > -1
-       };
+             return field.placeholder();
+           }).classed('mixed', function (d) {
+             return Array.isArray(tags.cycleway) || Array.isArray(tags[d]);
+           });
+         };
 
-       var MathUtil = function MathUtil () {};
+         cycleway.focus = function () {
+           var node = wrap.selectAll('input').node();
+           if (node) node.focus();
+         };
 
-       var staticAccessors$5 = { LOG_10: { configurable: true } };
+         return utilRebind(cycleway, dispatch$1, 'on');
+       }
 
-       MathUtil.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       MathUtil.prototype.getClass = function getClass () {
-         return MathUtil
-       };
-       MathUtil.log10 = function log10 (x) {
-         var ln = Math.log(x);
-         if (Double.isInfinite(ln)) { return ln }
-         if (Double.isNaN(ln)) { return ln }
-         return ln / MathUtil.LOG_10
-       };
-       MathUtil.min = function min (v1, v2, v3, v4) {
-         var min = v1;
-         if (v2 < min) { min = v2; }
-         if (v3 < min) { min = v3; }
-         if (v4 < min) { min = v4; }
-         return min
-       };
-       MathUtil.clamp = function clamp () {
-         if (typeof arguments[2] === 'number' && (typeof arguments[0] === 'number' && typeof arguments[1] === 'number')) {
-           var x = arguments[0];
-           var min = arguments[1];
-           var max = arguments[2];
-           if (x < min) { return min }
-           if (x > max) { return max }
-           return x
-         } else if (Number.isInteger(arguments[2]) && (Number.isInteger(arguments[0]) && Number.isInteger(arguments[1]))) {
-           var x$1 = arguments[0];
-           var min$1 = arguments[1];
-           var max$1 = arguments[2];
-           if (x$1 < min$1) { return min$1 }
-           if (x$1 > max$1) { return max$1 }
-           return x$1
-         }
-       };
-       MathUtil.wrap = function wrap (index, max) {
-         if (index < 0) {
-           return max - -index % max
-         }
-         return index % max
-       };
-       MathUtil.max = function max () {
-         if (arguments.length === 3) {
-           var v1 = arguments[0];
-           var v2 = arguments[1];
-           var v3 = arguments[2];
-           var max = v1;
-           if (v2 > max) { max = v2; }
-           if (v3 > max) { max = v3; }
-           return max
-         } else if (arguments.length === 4) {
-           var v1$1 = arguments[0];
-           var v2$1 = arguments[1];
-           var v3$1 = arguments[2];
-           var v4 = arguments[3];
-           var max$1 = v1$1;
-           if (v2$1 > max$1) { max$1 = v2$1; }
-           if (v3$1 > max$1) { max$1 = v3$1; }
-           if (v4 > max$1) { max$1 = v4; }
-           return max$1
+       function uiFieldLanes(field, context) {
+         var dispatch$1 = dispatch('change');
+         var LANE_WIDTH = 40;
+         var LANE_HEIGHT = 200;
+         var _entityIDs = [];
+
+         function lanes(selection) {
+           var lanesData = context.entity(_entityIDs[0]).lanes();
+
+           if (!context.container().select('.inspector-wrap.inspector-hidden').empty() || !selection.node().parentNode) {
+             selection.call(lanes.off);
+             return;
+           }
+
+           var wrap = selection.selectAll('.form-field-input-wrap').data([0]);
+           wrap = wrap.enter().append('div').attr('class', 'form-field-input-wrap form-field-input-' + field.type).merge(wrap);
+           var surface = wrap.selectAll('.surface').data([0]);
+           var d = utilGetDimensions(wrap);
+           var freeSpace = d[0] - lanesData.lanes.length * LANE_WIDTH * 1.5 + LANE_WIDTH * 0.5;
+           surface = surface.enter().append('svg').attr('width', d[0]).attr('height', 300).attr('class', 'surface').merge(surface);
+           var lanesSelection = surface.selectAll('.lanes').data([0]);
+           lanesSelection = lanesSelection.enter().append('g').attr('class', 'lanes').merge(lanesSelection);
+           lanesSelection.attr('transform', function () {
+             return 'translate(' + freeSpace / 2 + ', 0)';
+           });
+           var lane = lanesSelection.selectAll('.lane').data(lanesData.lanes);
+           lane.exit().remove();
+           var enter = lane.enter().append('g').attr('class', 'lane');
+           enter.append('g').append('rect').attr('y', 50).attr('width', LANE_WIDTH).attr('height', LANE_HEIGHT);
+           enter.append('g').attr('class', 'forward').append('text').attr('y', 40).attr('x', 14).html('▲');
+           enter.append('g').attr('class', 'bothways').append('text').attr('y', 40).attr('x', 14).html('▲▼');
+           enter.append('g').attr('class', 'backward').append('text').attr('y', 40).attr('x', 14).html('▼');
+           lane = lane.merge(enter);
+           lane.attr('transform', function (d) {
+             return 'translate(' + LANE_WIDTH * d.index * 1.5 + ', 0)';
+           });
+           lane.select('.forward').style('visibility', function (d) {
+             return d.direction === 'forward' ? 'visible' : 'hidden';
+           });
+           lane.select('.bothways').style('visibility', function (d) {
+             return d.direction === 'bothways' ? 'visible' : 'hidden';
+           });
+           lane.select('.backward').style('visibility', function (d) {
+             return d.direction === 'backward' ? 'visible' : 'hidden';
+           });
          }
-       };
-       MathUtil.average = function average (x1, x2) {
-         return (x1 + x2) / 2.0
-       };
-       staticAccessors$5.LOG_10.get = function () { return Math.log(10) };
 
-       Object.defineProperties( MathUtil, staticAccessors$5 );
+         lanes.entityIDs = function (val) {
+           _entityIDs = val;
+         };
 
-       var StringBuffer = function StringBuffer (str) {
-         this.str = str;
-       };
-       StringBuffer.prototype.append = function append (e) {
-         this.str += e;
-       };
+         lanes.tags = function () {};
 
-       StringBuffer.prototype.setCharAt = function setCharAt (i, c) {
-         this.str = this.str.substr(0, i) + c + this.str.substr(i + 1);
-       };
+         lanes.focus = function () {};
 
-       StringBuffer.prototype.toString = function toString (e) {
-         return this.str
-       };
+         lanes.off = function () {};
 
-       var Integer = function Integer (value) {
-         this.value = value;
-       };
-       Integer.prototype.intValue = function intValue () {
-         return this.value
-       };
-       Integer.prototype.compareTo = function compareTo (o) {
-         if (this.value < o) { return -1 }
-         if (this.value > o) { return 1 }
-         return 0
-       };
-       Integer.isNaN = function isNaN (n) { return Number.isNaN(n) };
-
-       var Character = function Character () {};
-
-       Character.isWhitespace = function isWhitespace (c) { return ((c <= 32 && c >= 0) || c === 127) };
-       Character.toUpperCase = function toUpperCase (c) { return c.toUpperCase() };
-
-       var DD = function DD () {
-         this._hi = 0.0;
-         this._lo = 0.0;
-         if (arguments.length === 0) {
-           this.init(0.0);
-         } else if (arguments.length === 1) {
-           if (typeof arguments[0] === 'number') {
-             var x = arguments[0];
-             this.init(x);
-           } else if (arguments[0] instanceof DD) {
-             var dd = arguments[0];
-             this.init(dd);
-           } else if (typeof arguments[0] === 'string') {
-             var str = arguments[0];
-             DD.call(this, DD.parse(str));
-           }
-         } else if (arguments.length === 2) {
-           var hi = arguments[0];
-           var lo = arguments[1];
-           this.init(hi, lo);
-         }
-       };
+         return utilRebind(lanes, dispatch$1, 'on');
+       }
+       uiFieldLanes.supportsMultiselection = false;
 
-       var staticAccessors$7 = { PI: { configurable: true },TWO_PI: { configurable: true },PI_2: { configurable: true },E: { configurable: true },NaN: { configurable: true },EPS: { configurable: true },SPLIT: { configurable: true },MAX_PRINT_DIGITS: { configurable: true },TEN: { configurable: true },ONE: { configurable: true },SCI_NOT_EXPONENT_CHAR: { configurable: true },SCI_NOT_ZERO: { configurable: true } };
-       DD.prototype.le = function le (y) {
-         return (this._hi < y._hi || this._hi === y._hi) && this._lo <= y._lo
-       };
-       DD.prototype.extractSignificantDigits = function extractSignificantDigits (insertDecimalPoint, magnitude) {
-         var y = this.abs();
-         var mag = DD.magnitude(y._hi);
-         var scale = DD.TEN.pow(mag);
-         y = y.divide(scale);
-         if (y.gt(DD.TEN)) {
-           y = y.divide(DD.TEN);
-           mag += 1;
-         } else if (y.lt(DD.ONE)) {
-           y = y.multiply(DD.TEN);
-           mag -= 1;
-         }
-         var decimalPointPos = mag + 1;
-         var buf = new StringBuffer();
-         var numDigits = DD.MAX_PRINT_DIGITS - 1;
-         for (var i = 0; i <= numDigits; i++) {
-           if (insertDecimalPoint && i === decimalPointPos) {
-             buf.append('.');
-           }
-           var digit = Math.trunc(y._hi);
-           if (digit < 0) {
-             break
-           }
-           var rebiasBy10 = false;
-           var digitChar = 0;
-           if (digit > 9) {
-             rebiasBy10 = true;
-             digitChar = '9';
-           } else {
-             digitChar = '0' + digit;
-           }
-           buf.append(digitChar);
-           y = y.subtract(DD.valueOf(digit)).multiply(DD.TEN);
-           if (rebiasBy10) { y.selfAdd(DD.TEN); }
-           var continueExtractingDigits = true;
-           var remMag = DD.magnitude(y._hi);
-           if (remMag < 0 && Math.abs(remMag) >= numDigits - i) { continueExtractingDigits = false; }
-           if (!continueExtractingDigits) { break }
-         }
-         magnitude[0] = mag;
-         return buf.toString()
-       };
-       DD.prototype.sqr = function sqr () {
-         return this.multiply(this)
-       };
-       DD.prototype.doubleValue = function doubleValue () {
-         return this._hi + this._lo
-       };
-       DD.prototype.subtract = function subtract () {
-         if (arguments[0] instanceof DD) {
-           var y = arguments[0];
-           return this.add(y.negate())
-         } else if (typeof arguments[0] === 'number') {
-           var y$1 = arguments[0];
-           return this.add(-y$1)
-         }
-       };
-       DD.prototype.equals = function equals () {
-         if (arguments.length === 1) {
-           var y = arguments[0];
-           return this._hi === y._hi && this._lo === y._lo
-         }
-       };
-       DD.prototype.isZero = function isZero () {
-         return this._hi === 0.0 && this._lo === 0.0
-       };
-       DD.prototype.selfSubtract = function selfSubtract () {
-         if (arguments[0] instanceof DD) {
-           var y = arguments[0];
-           if (this.isNaN()) { return this }
-           return this.selfAdd(-y._hi, -y._lo)
-         } else if (typeof arguments[0] === 'number') {
-           var y$1 = arguments[0];
-           if (this.isNaN()) { return this }
-           return this.selfAdd(-y$1, 0.0)
-         }
-       };
-       DD.prototype.getSpecialNumberString = function getSpecialNumberString () {
-         if (this.isZero()) { return '0.0' }
-         if (this.isNaN()) { return 'NaN ' }
-         return null
-       };
-       DD.prototype.min = function min (x) {
-         if (this.le(x)) {
-           return this
-         } else {
-           return x
-         }
-       };
-       DD.prototype.selfDivide = function selfDivide () {
-         if (arguments.length === 1) {
-           if (arguments[0] instanceof DD) {
-             var y = arguments[0];
-             return this.selfDivide(y._hi, y._lo)
-           } else if (typeof arguments[0] === 'number') {
-             var y$1 = arguments[0];
-             return this.selfDivide(y$1, 0.0)
-           }
-         } else if (arguments.length === 2) {
-           var yhi = arguments[0];
-           var ylo = arguments[1];
-           var hc = null;
-           var tc = null;
-           var hy = null;
-           var ty = null;
-           var C = null;
-           var c = null;
-           var U = null;
-           var u = null;
-           C = this._hi / yhi;
-           c = DD.SPLIT * C;
-           hc = c - C;
-           u = DD.SPLIT * yhi;
-           hc = c - hc;
-           tc = C - hc;
-           hy = u - yhi;
-           U = C * yhi;
-           hy = u - hy;
-           ty = yhi - hy;
-           u = hc * hy - U + hc * ty + tc * hy + tc * ty;
-           c = (this._hi - U - u + this._lo - C * ylo) / yhi;
-           u = C + c;
-           this._hi = u;
-           this._lo = C - u + c;
-           return this
-         }
-       };
-       DD.prototype.dump = function dump () {
-         return 'DD<' + this._hi + ', ' + this._lo + '>'
-       };
-       DD.prototype.divide = function divide () {
-         if (arguments[0] instanceof DD) {
-           var y = arguments[0];
-           var hc = null;
-           var tc = null;
-           var hy = null;
-           var ty = null;
-           var C = null;
-           var c = null;
-           var U = null;
-           var u = null;
-           C = this._hi / y._hi;
-           c = DD.SPLIT * C;
-           hc = c - C;
-           u = DD.SPLIT * y._hi;
-           hc = c - hc;
-           tc = C - hc;
-           hy = u - y._hi;
-           U = C * y._hi;
-           hy = u - hy;
-           ty = y._hi - hy;
-           u = hc * hy - U + hc * ty + tc * hy + tc * ty;
-           c = (this._hi - U - u + this._lo - C * y._lo) / y._hi;
-           u = C + c;
-           var zhi = u;
-           var zlo = C - u + c;
-           return new DD(zhi, zlo)
-         } else if (typeof arguments[0] === 'number') {
-           var y$1 = arguments[0];
-           if (Double.isNaN(y$1)) { return DD.createNaN() }
-           return DD.copy(this).selfDivide(y$1, 0.0)
-         }
-       };
-       DD.prototype.ge = function ge (y) {
-         return (this._hi > y._hi || this._hi === y._hi) && this._lo >= y._lo
-       };
-       DD.prototype.pow = function pow (exp) {
-         if (exp === 0.0) { return DD.valueOf(1.0) }
-         var r = new DD(this);
-         var s = DD.valueOf(1.0);
-         var n = Math.abs(exp);
-         if (n > 1) {
-           while (n > 0) {
-             if (n % 2 === 1) {
-               s.selfMultiply(r);
-             }
-             n /= 2;
-             if (n > 0) { r = r.sqr(); }
-           }
-         } else {
-           s = r;
-         }
-         if (exp < 0) { return s.reciprocal() }
-         return s
-       };
-       DD.prototype.ceil = function ceil () {
-         if (this.isNaN()) { return DD.NaN }
-         var fhi = Math.ceil(this._hi);
-         var flo = 0.0;
-         if (fhi === this._hi) {
-           flo = Math.ceil(this._lo);
-         }
-         return new DD(fhi, flo)
-       };
-       DD.prototype.compareTo = function compareTo (o) {
-         var other = o;
-         if (this._hi < other._hi) { return -1 }
-         if (this._hi > other._hi) { return 1 }
-         if (this._lo < other._lo) { return -1 }
-         if (this._lo > other._lo) { return 1 }
-         return 0
-       };
-       DD.prototype.rint = function rint () {
-         if (this.isNaN()) { return this }
-         var plus5 = this.add(0.5);
-         return plus5.floor()
-       };
-       DD.prototype.setValue = function setValue () {
-         if (arguments[0] instanceof DD) {
-           var value = arguments[0];
-           this.init(value);
-           return this
-         } else if (typeof arguments[0] === 'number') {
-           var value$1 = arguments[0];
-           this.init(value$1);
-           return this
-         }
-       };
-       DD.prototype.max = function max (x) {
-         if (this.ge(x)) {
-           return this
-         } else {
-           return x
-         }
-       };
-       DD.prototype.sqrt = function sqrt () {
-         if (this.isZero()) { return DD.valueOf(0.0) }
-         if (this.isNegative()) {
-           return DD.NaN
-         }
-         var x = 1.0 / Math.sqrt(this._hi);
-         var ax = this._hi * x;
-         var axdd = DD.valueOf(ax);
-         var diffSq = this.subtract(axdd.sqr());
-         var d2 = diffSq._hi * (x * 0.5);
-         return axdd.add(d2)
-       };
-       DD.prototype.selfAdd = function selfAdd () {
-         if (arguments.length === 1) {
-           if (arguments[0] instanceof DD) {
-             var y = arguments[0];
-             return this.selfAdd(y._hi, y._lo)
-           } else if (typeof arguments[0] === 'number') {
-             var y$1 = arguments[0];
-             var H = null;
-             var h = null;
-             var S = null;
-             var s = null;
-             var e = null;
-             var f = null;
-             S = this._hi + y$1;
-             e = S - this._hi;
-             s = S - e;
-             s = y$1 - e + (this._hi - s);
-             f = s + this._lo;
-             H = S + f;
-             h = f + (S - H);
-             this._hi = H + h;
-             this._lo = h + (H - this._hi);
-             return this
-           }
-         } else if (arguments.length === 2) {
-           var yhi = arguments[0];
-           var ylo = arguments[1];
-           var H$1 = null;
-           var h$1 = null;
-           var T = null;
-           var t = null;
-           var S$1 = null;
-           var s$1 = null;
-           var e$1 = null;
-           var f$1 = null;
-           S$1 = this._hi + yhi;
-           T = this._lo + ylo;
-           e$1 = S$1 - this._hi;
-           f$1 = T - this._lo;
-           s$1 = S$1 - e$1;
-           t = T - f$1;
-           s$1 = yhi - e$1 + (this._hi - s$1);
-           t = ylo - f$1 + (this._lo - t);
-           e$1 = s$1 + T;
-           H$1 = S$1 + e$1;
-           h$1 = e$1 + (S$1 - H$1);
-           e$1 = t + h$1;
-           var zhi = H$1 + e$1;
-           var zlo = e$1 + (H$1 - zhi);
-           this._hi = zhi;
-           this._lo = zlo;
-           return this
-         }
-       };
-       DD.prototype.selfMultiply = function selfMultiply () {
-         if (arguments.length === 1) {
-           if (arguments[0] instanceof DD) {
-             var y = arguments[0];
-             return this.selfMultiply(y._hi, y._lo)
-           } else if (typeof arguments[0] === 'number') {
-             var y$1 = arguments[0];
-             return this.selfMultiply(y$1, 0.0)
-           }
-         } else if (arguments.length === 2) {
-           var yhi = arguments[0];
-           var ylo = arguments[1];
-           var hx = null;
-           var tx = null;
-           var hy = null;
-           var ty = null;
-           var C = null;
-           var c = null;
-           C = DD.SPLIT * this._hi;
-           hx = C - this._hi;
-           c = DD.SPLIT * yhi;
-           hx = C - hx;
-           tx = this._hi - hx;
-           hy = c - yhi;
-           C = this._hi * yhi;
-           hy = c - hy;
-           ty = yhi - hy;
-           c = hx * hy - C + hx * ty + tx * hy + tx * ty + (this._hi * ylo + this._lo * yhi);
-           var zhi = C + c;
-           hx = C - zhi;
-           var zlo = c + hx;
-           this._hi = zhi;
-           this._lo = zlo;
-           return this
-         }
-       };
-       DD.prototype.selfSqr = function selfSqr () {
-         return this.selfMultiply(this)
-       };
-       DD.prototype.floor = function floor () {
-         if (this.isNaN()) { return DD.NaN }
-         var fhi = Math.floor(this._hi);
-         var flo = 0.0;
-         if (fhi === this._hi) {
-           flo = Math.floor(this._lo);
-         }
-         return new DD(fhi, flo)
-       };
-       DD.prototype.negate = function negate () {
-         if (this.isNaN()) { return this }
-         return new DD(-this._hi, -this._lo)
-       };
-       DD.prototype.clone = function clone () {
-         // try {
-         // return null
-         // } catch (ex) {
-         // if (ex instanceof CloneNotSupportedException) {
-         //   return null
-         // } else throw ex
-         // } finally {}
-       };
-       DD.prototype.multiply = function multiply () {
-         if (arguments[0] instanceof DD) {
-           var y = arguments[0];
-           if (y.isNaN()) { return DD.createNaN() }
-           return DD.copy(this).selfMultiply(y)
-         } else if (typeof arguments[0] === 'number') {
-           var y$1 = arguments[0];
-           if (Double.isNaN(y$1)) { return DD.createNaN() }
-           return DD.copy(this).selfMultiply(y$1, 0.0)
-         }
-       };
-       DD.prototype.isNaN = function isNaN () {
-         return Double.isNaN(this._hi)
-       };
-       DD.prototype.intValue = function intValue () {
-         return Math.trunc(this._hi)
-       };
-       DD.prototype.toString = function toString () {
-         var mag = DD.magnitude(this._hi);
-         if (mag >= -3 && mag <= 20) { return this.toStandardNotation() }
-         return this.toSciNotation()
-       };
-       DD.prototype.toStandardNotation = function toStandardNotation () {
-         var specialStr = this.getSpecialNumberString();
-         if (specialStr !== null) { return specialStr }
-         var magnitude = new Array(1).fill(null);
-         var sigDigits = this.extractSignificantDigits(true, magnitude);
-         var decimalPointPos = magnitude[0] + 1;
-         var num = sigDigits;
-         if (sigDigits.charAt(0) === '.') {
-           num = '0' + sigDigits;
-         } else if (decimalPointPos < 0) {
-           num = '0.' + DD.stringOfChar('0', -decimalPointPos) + sigDigits;
-         } else if (sigDigits.indexOf('.') === -1) {
-           var numZeroes = decimalPointPos - sigDigits.length;
-           var zeroes = DD.stringOfChar('0', numZeroes);
-           num = sigDigits + zeroes + '.0';
-         }
-         if (this.isNegative()) { return '-' + num }
-         return num
-       };
-       DD.prototype.reciprocal = function reciprocal () {
-         var hc = null;
-         var tc = null;
-         var hy = null;
-         var ty = null;
-         var C = null;
-         var c = null;
-         var U = null;
-         var u = null;
-         C = 1.0 / this._hi;
-         c = DD.SPLIT * C;
-         hc = c - C;
-         u = DD.SPLIT * this._hi;
-         hc = c - hc;
-         tc = C - hc;
-         hy = u - this._hi;
-         U = C * this._hi;
-         hy = u - hy;
-         ty = this._hi - hy;
-         u = hc * hy - U + hc * ty + tc * hy + tc * ty;
-         c = (1.0 - U - u - C * this._lo) / this._hi;
-         var zhi = C + c;
-         var zlo = C - zhi + c;
-         return new DD(zhi, zlo)
-       };
-       DD.prototype.toSciNotation = function toSciNotation () {
-         if (this.isZero()) { return DD.SCI_NOT_ZERO }
-         var specialStr = this.getSpecialNumberString();
-         if (specialStr !== null) { return specialStr }
-         var magnitude = new Array(1).fill(null);
-         var digits = this.extractSignificantDigits(false, magnitude);
-         var expStr = DD.SCI_NOT_EXPONENT_CHAR + magnitude[0];
-         if (digits.charAt(0) === '0') {
-           throw new Error('Found leading zero: ' + digits)
-         }
-         var trailingDigits = '';
-         if (digits.length > 1) { trailingDigits = digits.substring(1); }
-         var digitsWithDecimal = digits.charAt(0) + '.' + trailingDigits;
-         if (this.isNegative()) { return '-' + digitsWithDecimal + expStr }
-         return digitsWithDecimal + expStr
-       };
-       DD.prototype.abs = function abs () {
-         if (this.isNaN()) { return DD.NaN }
-         if (this.isNegative()) { return this.negate() }
-         return new DD(this)
-       };
-       DD.prototype.isPositive = function isPositive () {
-         return (this._hi > 0.0 || this._hi === 0.0) && this._lo > 0.0
-       };
-       DD.prototype.lt = function lt (y) {
-         return (this._hi < y._hi || this._hi === y._hi) && this._lo < y._lo
-       };
-       DD.prototype.add = function add () {
-         if (arguments[0] instanceof DD) {
-           var y = arguments[0];
-           return DD.copy(this).selfAdd(y)
-         } else if (typeof arguments[0] === 'number') {
-           var y$1 = arguments[0];
-           return DD.copy(this).selfAdd(y$1)
-         }
-       };
-       DD.prototype.init = function init () {
-         if (arguments.length === 1) {
-           if (typeof arguments[0] === 'number') {
-             var x = arguments[0];
-             this._hi = x;
-             this._lo = 0.0;
-           } else if (arguments[0] instanceof DD) {
-             var dd = arguments[0];
-             this._hi = dd._hi;
-             this._lo = dd._lo;
-           }
-         } else if (arguments.length === 2) {
-           var hi = arguments[0];
-           var lo = arguments[1];
-           this._hi = hi;
-           this._lo = lo;
-         }
-       };
-       DD.prototype.gt = function gt (y) {
-         return (this._hi > y._hi || this._hi === y._hi) && this._lo > y._lo
-       };
-       DD.prototype.isNegative = function isNegative () {
-         return (this._hi < 0.0 || this._hi === 0.0) && this._lo < 0.0
-       };
-       DD.prototype.trunc = function trunc () {
-         if (this.isNaN()) { return DD.NaN }
-         if (this.isPositive()) { return this.floor(); } else { return this.ceil() }
-       };
-       DD.prototype.signum = function signum () {
-         if (this._hi > 0) { return 1 }
-         if (this._hi < 0) { return -1 }
-         if (this._lo > 0) { return 1 }
-         if (this._lo < 0) { return -1 }
-         return 0
-       };
-       DD.prototype.interfaces_ = function interfaces_ () {
-         return [Serializable, Comparable, Clonable]
-       };
-       DD.prototype.getClass = function getClass () {
-         return DD
-       };
-       DD.sqr = function sqr (x) {
-         return DD.valueOf(x).selfMultiply(x)
-       };
-       DD.valueOf = function valueOf () {
-         if (typeof arguments[0] === 'string') {
-           var str = arguments[0];
-           return DD.parse(str)
-         } else if (typeof arguments[0] === 'number') {
-           var x = arguments[0];
-           return new DD(x)
-         }
-       };
-       DD.sqrt = function sqrt (x) {
-         return DD.valueOf(x).sqrt()
-       };
-       DD.parse = function parse (str) {
-         var i = 0;
-         var strlen = str.length;
-         while (Character.isWhitespace(str.charAt(i))) { i++; }
-         var isNegative = false;
-         if (i < strlen) {
-           var signCh = str.charAt(i);
-           if (signCh === '-' || signCh === '+') {
-             i++;
-             if (signCh === '-') { isNegative = true; }
-           }
-         }
-         var val = new DD();
-         var numDigits = 0;
-         var numBeforeDec = 0;
-         var exp = 0;
-         while (true) {
-           if (i >= strlen) { break }
-           var ch = str.charAt(i);
-           i++;
-           if (Character.isDigit(ch)) {
-             var d = ch - '0';
-             val.selfMultiply(DD.TEN);
-             val.selfAdd(d);
-             numDigits++;
-             continue
-           }
-           if (ch === '.') {
-             numBeforeDec = numDigits;
-             continue
-           }
-           if (ch === 'e' || ch === 'E') {
-             var expStr = str.substring(i);
-             try {
-               exp = Integer.parseInt(expStr);
-             } catch (ex) {
-               if (ex instanceof Error) {
-                 throw new Error('Invalid exponent ' + expStr + ' in string ' + str)
-               } else { throw ex }
-             } finally {}
-             break
-           }
-           throw new Error("Unexpected character '" + ch + "' at position " + i + ' in string ' + str)
-         }
-         var val2 = val;
-         var numDecPlaces = numDigits - numBeforeDec - exp;
-         if (numDecPlaces === 0) {
-           val2 = val;
-         } else if (numDecPlaces > 0) {
-           var scale = DD.TEN.pow(numDecPlaces);
-           val2 = val.divide(scale);
-         } else if (numDecPlaces < 0) {
-           var scale$1 = DD.TEN.pow(-numDecPlaces);
-           val2 = val.multiply(scale$1);
-         }
-         if (isNegative) {
-           return val2.negate()
-         }
-         return val2
-       };
-       DD.createNaN = function createNaN () {
-         return new DD(Double.NaN, Double.NaN)
-       };
-       DD.copy = function copy (dd) {
-         return new DD(dd)
-       };
-       DD.magnitude = function magnitude (x) {
-         var xAbs = Math.abs(x);
-         var xLog10 = Math.log(xAbs) / Math.log(10);
-         var xMag = Math.trunc(Math.floor(xLog10));
-         var xApprox = Math.pow(10, xMag);
-         if (xApprox * 10 <= xAbs) { xMag += 1; }
-         return xMag
-       };
-       DD.stringOfChar = function stringOfChar (ch, len) {
-         var buf = new StringBuffer();
-         for (var i = 0; i < len; i++) {
-           buf.append(ch);
-         }
-         return buf.toString()
-       };
-       staticAccessors$7.PI.get = function () { return new DD(3.141592653589793116e+00, 1.224646799147353207e-16) };
-       staticAccessors$7.TWO_PI.get = function () { return new DD(6.283185307179586232e+00, 2.449293598294706414e-16) };
-       staticAccessors$7.PI_2.get = function () { return new DD(1.570796326794896558e+00, 6.123233995736766036e-17) };
-       staticAccessors$7.E.get = function () { return new DD(2.718281828459045091e+00, 1.445646891729250158e-16) };
-       staticAccessors$7.NaN.get = function () { return new DD(Double.NaN, Double.NaN) };
-       staticAccessors$7.EPS.get = function () { return 1.23259516440783e-32 };
-       staticAccessors$7.SPLIT.get = function () { return 134217729.0 };
-       staticAccessors$7.MAX_PRINT_DIGITS.get = function () { return 32 };
-       staticAccessors$7.TEN.get = function () { return DD.valueOf(10.0) };
-       staticAccessors$7.ONE.get = function () { return DD.valueOf(1.0) };
-       staticAccessors$7.SCI_NOT_EXPONENT_CHAR.get = function () { return 'E' };
-       staticAccessors$7.SCI_NOT_ZERO.get = function () { return '0.0E0' };
-
-       Object.defineProperties( DD, staticAccessors$7 );
-
-       var CGAlgorithmsDD = function CGAlgorithmsDD () {};
-
-       var staticAccessors$6 = { DP_SAFE_EPSILON: { configurable: true } };
-
-       CGAlgorithmsDD.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       CGAlgorithmsDD.prototype.getClass = function getClass () {
-         return CGAlgorithmsDD
-       };
-       CGAlgorithmsDD.orientationIndex = function orientationIndex (p1, p2, q) {
-         var index = CGAlgorithmsDD.orientationIndexFilter(p1, p2, q);
-         if (index <= 1) { return index }
-         var dx1 = DD.valueOf(p2.x).selfAdd(-p1.x);
-         var dy1 = DD.valueOf(p2.y).selfAdd(-p1.y);
-         var dx2 = DD.valueOf(q.x).selfAdd(-p2.x);
-         var dy2 = DD.valueOf(q.y).selfAdd(-p2.y);
-         return dx1.selfMultiply(dy2).selfSubtract(dy1.selfMultiply(dx2)).signum()
-       };
-       CGAlgorithmsDD.signOfDet2x2 = function signOfDet2x2 (x1, y1, x2, y2) {
-         var det = x1.multiply(y2).selfSubtract(y1.multiply(x2));
-         return det.signum()
-       };
-       CGAlgorithmsDD.intersection = function intersection (p1, p2, q1, q2) {
-         var denom1 = DD.valueOf(q2.y).selfSubtract(q1.y).selfMultiply(DD.valueOf(p2.x).selfSubtract(p1.x));
-         var denom2 = DD.valueOf(q2.x).selfSubtract(q1.x).selfMultiply(DD.valueOf(p2.y).selfSubtract(p1.y));
-         var denom = denom1.subtract(denom2);
-         var numx1 = DD.valueOf(q2.x).selfSubtract(q1.x).selfMultiply(DD.valueOf(p1.y).selfSubtract(q1.y));
-         var numx2 = DD.valueOf(q2.y).selfSubtract(q1.y).selfMultiply(DD.valueOf(p1.x).selfSubtract(q1.x));
-         var numx = numx1.subtract(numx2);
-         var fracP = numx.selfDivide(denom).doubleValue();
-         var x = DD.valueOf(p1.x).selfAdd(DD.valueOf(p2.x).selfSubtract(p1.x).selfMultiply(fracP)).doubleValue();
-         var numy1 = DD.valueOf(p2.x).selfSubtract(p1.x).selfMultiply(DD.valueOf(p1.y).selfSubtract(q1.y));
-         var numy2 = DD.valueOf(p2.y).selfSubtract(p1.y).selfMultiply(DD.valueOf(p1.x).selfSubtract(q1.x));
-         var numy = numy1.subtract(numy2);
-         var fracQ = numy.selfDivide(denom).doubleValue();
-         var y = DD.valueOf(q1.y).selfAdd(DD.valueOf(q2.y).selfSubtract(q1.y).selfMultiply(fracQ)).doubleValue();
-         return new Coordinate(x, y)
-       };
-       CGAlgorithmsDD.orientationIndexFilter = function orientationIndexFilter (pa, pb, pc) {
-         var detsum = null;
-         var detleft = (pa.x - pc.x) * (pb.y - pc.y);
-         var detright = (pa.y - pc.y) * (pb.x - pc.x);
-         var det = detleft - detright;
-         if (detleft > 0.0) {
-           if (detright <= 0.0) {
-             return CGAlgorithmsDD.signum(det)
-           } else {
-             detsum = detleft + detright;
-           }
-         } else if (detleft < 0.0) {
-           if (detright >= 0.0) {
-             return CGAlgorithmsDD.signum(det)
-           } else {
-             detsum = -detleft - detright;
-           }
-         } else {
-           return CGAlgorithmsDD.signum(det)
-         }
-         var errbound = CGAlgorithmsDD.DP_SAFE_EPSILON * detsum;
-         if (det >= errbound || -det >= errbound) {
-           return CGAlgorithmsDD.signum(det)
-         }
-         return 2
-       };
-       CGAlgorithmsDD.signum = function signum (x) {
-         if (x > 0) { return 1 }
-         if (x < 0) { return -1 }
-         return 0
-       };
-       staticAccessors$6.DP_SAFE_EPSILON.get = function () { return 1e-15 };
-
-       Object.defineProperties( CGAlgorithmsDD, staticAccessors$6 );
-
-       var CoordinateSequence = function CoordinateSequence () {};
-
-       var staticAccessors$8 = { X: { configurable: true },Y: { configurable: true },Z: { configurable: true },M: { configurable: true } };
-
-       staticAccessors$8.X.get = function () { return 0 };
-       staticAccessors$8.Y.get = function () { return 1 };
-       staticAccessors$8.Z.get = function () { return 2 };
-       staticAccessors$8.M.get = function () { return 3 };
-       CoordinateSequence.prototype.setOrdinate = function setOrdinate (index, ordinateIndex, value) {};
-       CoordinateSequence.prototype.size = function size () {};
-       CoordinateSequence.prototype.getOrdinate = function getOrdinate (index, ordinateIndex) {};
-       CoordinateSequence.prototype.getCoordinate = function getCoordinate () {};
-       CoordinateSequence.prototype.getCoordinateCopy = function getCoordinateCopy (i) {};
-       CoordinateSequence.prototype.getDimension = function getDimension () {};
-       CoordinateSequence.prototype.getX = function getX (index) {};
-       CoordinateSequence.prototype.clone = function clone () {};
-       CoordinateSequence.prototype.expandEnvelope = function expandEnvelope (env) {};
-       CoordinateSequence.prototype.copy = function copy () {};
-       CoordinateSequence.prototype.getY = function getY (index) {};
-       CoordinateSequence.prototype.toCoordinateArray = function toCoordinateArray () {};
-       CoordinateSequence.prototype.interfaces_ = function interfaces_ () {
-         return [Clonable]
-       };
-       CoordinateSequence.prototype.getClass = function getClass () {
-         return CoordinateSequence
-       };
+       var _languagesArray = [];
+       function uiFieldLocalized(field, context) {
+         var dispatch$1 = dispatch('change', 'input');
+         var wikipedia = services.wikipedia;
+         var input = select(null);
+         var localizedInputs = select(null);
 
-       Object.defineProperties( CoordinateSequence, staticAccessors$8 );
+         var _countryCode;
 
-       var Exception = function Exception () {};
+         var _tags; // A concern here in switching to async data means that _languagesArray will not
+         // be available the first time through, so things like the fetchers and
+         // the language() function will not work immediately.
 
-       var NotRepresentableException = (function (Exception$$1) {
-         function NotRepresentableException () {
-           Exception$$1.call(this, 'Projective point not representable on the Cartesian plane.');
-         }
 
-         if ( Exception$$1 ) NotRepresentableException.__proto__ = Exception$$1;
-         NotRepresentableException.prototype = Object.create( Exception$$1 && Exception$$1.prototype );
-         NotRepresentableException.prototype.constructor = NotRepresentableException;
-         NotRepresentableException.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         NotRepresentableException.prototype.getClass = function getClass () {
-           return NotRepresentableException
-         };
+         _mainFileFetcher.get('languages').then(loadLanguagesArray)["catch"](function () {
+           /* ignore */
+         });
+         var _territoryLanguages = {};
+         _mainFileFetcher.get('territory_languages').then(function (d) {
+           _territoryLanguages = d;
+         })["catch"](function () {
+           /* ignore */
+         });
+         var allSuggestions = _mainPresetIndex.collection.filter(function (p) {
+           return p.suggestion === true;
+         }); // reuse these combos
 
-         return NotRepresentableException;
-       }(Exception));
+         var langCombo = uiCombobox(context, 'localized-lang').fetcher(fetchLanguages).minItems(0);
+         var brandCombo = uiCombobox(context, 'localized-brand').canAutocomplete(false).minItems(1);
 
-       var System = function System () {};
+         var _selection = select(null);
 
-       System.arraycopy = function arraycopy (src, srcPos, dest, destPos, len) {
-         var c = 0;
-         for (var i = srcPos; i < srcPos + len; i++) {
-           dest[destPos + c] = src[i];
-           c++;
-         }
-       };
+         var _multilingual = [];
 
-       System.getProperty = function getProperty (name) {
-         return {
-           'line.separator': '\n'
-         }[name]
-       };
+         var _buttonTip = uiTooltip().title(_t.html('translate.translate')).placement('left');
 
-       var HCoordinate = function HCoordinate () {
-         this.x = null;
-         this.y = null;
-         this.w = null;
-         if (arguments.length === 0) {
-           this.x = 0.0;
-           this.y = 0.0;
-           this.w = 1.0;
-         } else if (arguments.length === 1) {
-           var p = arguments[0];
-           this.x = p.x;
-           this.y = p.y;
-           this.w = 1.0;
-         } else if (arguments.length === 2) {
-           if (typeof arguments[0] === 'number' && typeof arguments[1] === 'number') {
-             var _x = arguments[0];
-             var _y = arguments[1];
-             this.x = _x;
-             this.y = _y;
-             this.w = 1.0;
-           } else if (arguments[0] instanceof HCoordinate && arguments[1] instanceof HCoordinate) {
-             var p1 = arguments[0];
-             var p2 = arguments[1];
-             this.x = p1.y * p2.w - p2.y * p1.w;
-             this.y = p2.x * p1.w - p1.x * p2.w;
-             this.w = p1.x * p2.y - p2.x * p1.y;
-           } else if (arguments[0] instanceof Coordinate && arguments[1] instanceof Coordinate) {
-             var p1$1 = arguments[0];
-             var p2$1 = arguments[1];
-             this.x = p1$1.y - p2$1.y;
-             this.y = p2$1.x - p1$1.x;
-             this.w = p1$1.x * p2$1.y - p2$1.x * p1$1.y;
-           }
-         } else if (arguments.length === 3) {
-           var _x$1 = arguments[0];
-           var _y$1 = arguments[1];
-           var _w = arguments[2];
-           this.x = _x$1;
-           this.y = _y$1;
-           this.w = _w;
-         } else if (arguments.length === 4) {
-           var p1$2 = arguments[0];
-           var p2$2 = arguments[1];
-           var q1 = arguments[2];
-           var q2 = arguments[3];
-           var px = p1$2.y - p2$2.y;
-           var py = p2$2.x - p1$2.x;
-           var pw = p1$2.x * p2$2.y - p2$2.x * p1$2.y;
-           var qx = q1.y - q2.y;
-           var qy = q2.x - q1.x;
-           var qw = q1.x * q2.y - q2.x * q1.y;
-           this.x = py * qw - qy * pw;
-           this.y = qx * pw - px * qw;
-           this.w = px * qy - qx * py;
-         }
-       };
-       HCoordinate.prototype.getY = function getY () {
-         var a = this.y / this.w;
-         if (Double.isNaN(a) || Double.isInfinite(a)) {
-           throw new NotRepresentableException()
-         }
-         return a
-       };
-       HCoordinate.prototype.getX = function getX () {
-         var a = this.x / this.w;
-         if (Double.isNaN(a) || Double.isInfinite(a)) {
-           throw new NotRepresentableException()
-         }
-         return a
-       };
-       HCoordinate.prototype.getCoordinate = function getCoordinate () {
-         var p = new Coordinate();
-         p.x = this.getX();
-         p.y = this.getY();
-         return p
-       };
-       HCoordinate.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       HCoordinate.prototype.getClass = function getClass () {
-         return HCoordinate
-       };
-       HCoordinate.intersection = function intersection (p1, p2, q1, q2) {
-         var px = p1.y - p2.y;
-         var py = p2.x - p1.x;
-         var pw = p1.x * p2.y - p2.x * p1.y;
-         var qx = q1.y - q2.y;
-         var qy = q2.x - q1.x;
-         var qw = q1.x * q2.y - q2.x * q1.y;
-         var x = py * qw - qy * pw;
-         var y = qx * pw - px * qw;
-         var w = px * qy - qx * py;
-         var xInt = x / w;
-         var yInt = y / w;
-         if (Double.isNaN(xInt) || (Double.isInfinite(xInt) || Double.isNaN(yInt)) || Double.isInfinite(yInt)) {
-           throw new NotRepresentableException()
-         }
-         return new Coordinate(xInt, yInt)
-       };
+         var _wikiTitles;
 
-       var Envelope = function Envelope () {
-         this._minx = null;
-         this._maxx = null;
-         this._miny = null;
-         this._maxy = null;
-         if (arguments.length === 0) {
-           this.init();
-         } else if (arguments.length === 1) {
-           if (arguments[0] instanceof Coordinate) {
-             var p = arguments[0];
-             this.init(p.x, p.x, p.y, p.y);
-           } else if (arguments[0] instanceof Envelope) {
-             var env = arguments[0];
-             this.init(env);
-           }
-         } else if (arguments.length === 2) {
-           var p1 = arguments[0];
-           var p2 = arguments[1];
-           this.init(p1.x, p2.x, p1.y, p2.y);
-         } else if (arguments.length === 4) {
-           var x1 = arguments[0];
-           var x2 = arguments[1];
-           var y1 = arguments[2];
-           var y2 = arguments[3];
-           this.init(x1, x2, y1, y2);
-         }
-       };
+         var _entityIDs = [];
 
-       var staticAccessors$9 = { serialVersionUID: { configurable: true } };
-       Envelope.prototype.getArea = function getArea () {
-         return this.getWidth() * this.getHeight()
-       };
-       Envelope.prototype.equals = function equals (other) {
-         if (!(other instanceof Envelope)) {
-           return false
-         }
-         var otherEnvelope = other;
-         if (this.isNull()) {
-           return otherEnvelope.isNull()
-         }
-         return this._maxx === otherEnvelope.getMaxX() && this._maxy === otherEnvelope.getMaxY() && this._minx === otherEnvelope.getMinX() && this._miny === otherEnvelope.getMinY()
-       };
-       Envelope.prototype.intersection = function intersection (env) {
-         if (this.isNull() || env.isNull() || !this.intersects(env)) { return new Envelope() }
-         var intMinX = this._minx > env._minx ? this._minx : env._minx;
-         var intMinY = this._miny > env._miny ? this._miny : env._miny;
-         var intMaxX = this._maxx < env._maxx ? this._maxx : env._maxx;
-         var intMaxY = this._maxy < env._maxy ? this._maxy : env._maxy;
-         return new Envelope(intMinX, intMaxX, intMinY, intMaxY)
-       };
-       Envelope.prototype.isNull = function isNull () {
-         return this._maxx < this._minx
-       };
-       Envelope.prototype.getMaxX = function getMaxX () {
-         return this._maxx
-       };
-       Envelope.prototype.covers = function covers () {
-         if (arguments.length === 1) {
-           if (arguments[0] instanceof Coordinate) {
-             var p = arguments[0];
-             return this.covers(p.x, p.y)
-           } else if (arguments[0] instanceof Envelope) {
-             var other = arguments[0];
-             if (this.isNull() || other.isNull()) {
-               return false
-             }
-             return other.getMinX() >= this._minx && other.getMaxX() <= this._maxx && other.getMinY() >= this._miny && other.getMaxY() <= this._maxy
-           }
-         } else if (arguments.length === 2) {
-           var x = arguments[0];
-           var y = arguments[1];
-           if (this.isNull()) { return false }
-           return x >= this._minx && x <= this._maxx && y >= this._miny && y <= this._maxy
-         }
-       };
-       Envelope.prototype.intersects = function intersects () {
-         if (arguments.length === 1) {
-           if (arguments[0] instanceof Envelope) {
-             var other = arguments[0];
-             if (this.isNull() || other.isNull()) {
-               return false
-             }
-             return !(other._minx > this._maxx || other._maxx < this._minx || other._miny > this._maxy || other._maxy < this._miny)
-           } else if (arguments[0] instanceof Coordinate) {
-             var p = arguments[0];
-             return this.intersects(p.x, p.y)
-           }
-         } else if (arguments.length === 2) {
-           var x = arguments[0];
-           var y = arguments[1];
-           if (this.isNull()) { return false }
-           return !(x > this._maxx || x < this._minx || y > this._maxy || y < this._miny)
-         }
-       };
-       Envelope.prototype.getMinY = function getMinY () {
-         return this._miny
-       };
-       Envelope.prototype.getMinX = function getMinX () {
-         return this._minx
-       };
-       Envelope.prototype.expandToInclude = function expandToInclude () {
-         if (arguments.length === 1) {
-           if (arguments[0] instanceof Coordinate) {
-             var p = arguments[0];
-             this.expandToInclude(p.x, p.y);
-           } else if (arguments[0] instanceof Envelope) {
-             var other = arguments[0];
-             if (other.isNull()) {
-               return null
-             }
-             if (this.isNull()) {
-               this._minx = other.getMinX();
-               this._maxx = other.getMaxX();
-               this._miny = other.getMinY();
-               this._maxy = other.getMaxY();
-             } else {
-               if (other._minx < this._minx) {
-                 this._minx = other._minx;
-               }
-               if (other._maxx > this._maxx) {
-                 this._maxx = other._maxx;
-               }
-               if (other._miny < this._miny) {
-                 this._miny = other._miny;
-               }
-               if (other._maxy > this._maxy) {
-                 this._maxy = other._maxy;
-               }
-             }
-           }
-         } else if (arguments.length === 2) {
-           var x = arguments[0];
-           var y = arguments[1];
-           if (this.isNull()) {
-             this._minx = x;
-             this._maxx = x;
-             this._miny = y;
-             this._maxy = y;
-           } else {
-             if (x < this._minx) {
-               this._minx = x;
-             }
-             if (x > this._maxx) {
-               this._maxx = x;
-             }
-             if (y < this._miny) {
-               this._miny = y;
-             }
-             if (y > this._maxy) {
-               this._maxy = y;
-             }
-           }
-         }
-       };
-       Envelope.prototype.minExtent = function minExtent () {
-         if (this.isNull()) { return 0.0 }
-         var w = this.getWidth();
-         var h = this.getHeight();
-         if (w < h) { return w }
-         return h
-       };
-       Envelope.prototype.getWidth = function getWidth () {
-         if (this.isNull()) {
-           return 0
-         }
-         return this._maxx - this._minx
-       };
-       Envelope.prototype.compareTo = function compareTo (o) {
-         var env = o;
-         if (this.isNull()) {
-           if (env.isNull()) { return 0 }
-           return -1
-         } else {
-           if (env.isNull()) { return 1 }
-         }
-         if (this._minx < env._minx) { return -1 }
-         if (this._minx > env._minx) { return 1 }
-         if (this._miny < env._miny) { return -1 }
-         if (this._miny > env._miny) { return 1 }
-         if (this._maxx < env._maxx) { return -1 }
-         if (this._maxx > env._maxx) { return 1 }
-         if (this._maxy < env._maxy) { return -1 }
-         if (this._maxy > env._maxy) { return 1 }
-         return 0
-       };
-       Envelope.prototype.translate = function translate (transX, transY) {
-         if (this.isNull()) {
-           return null
-         }
-         this.init(this.getMinX() + transX, this.getMaxX() + transX, this.getMinY() + transY, this.getMaxY() + transY);
-       };
-       Envelope.prototype.toString = function toString () {
-         return 'Env[' + this._minx + ' : ' + this._maxx + ', ' + this._miny + ' : ' + this._maxy + ']'
-       };
-       Envelope.prototype.setToNull = function setToNull () {
-         this._minx = 0;
-         this._maxx = -1;
-         this._miny = 0;
-         this._maxy = -1;
-       };
-       Envelope.prototype.getHeight = function getHeight () {
-         if (this.isNull()) {
-           return 0
-         }
-         return this._maxy - this._miny
-       };
-       Envelope.prototype.maxExtent = function maxExtent () {
-         if (this.isNull()) { return 0.0 }
-         var w = this.getWidth();
-         var h = this.getHeight();
-         if (w > h) { return w }
-         return h
-       };
-       Envelope.prototype.expandBy = function expandBy () {
-         if (arguments.length === 1) {
-           var distance = arguments[0];
-           this.expandBy(distance, distance);
-         } else if (arguments.length === 2) {
-           var deltaX = arguments[0];
-           var deltaY = arguments[1];
-           if (this.isNull()) { return null }
-           this._minx -= deltaX;
-           this._maxx += deltaX;
-           this._miny -= deltaY;
-           this._maxy += deltaY;
-           if (this._minx > this._maxx || this._miny > this._maxy) { this.setToNull(); }
-         }
-       };
-       Envelope.prototype.contains = function contains () {
-         if (arguments.length === 1) {
-           if (arguments[0] instanceof Envelope) {
-             var other = arguments[0];
-             return this.covers(other)
-           } else if (arguments[0] instanceof Coordinate) {
-             var p = arguments[0];
-             return this.covers(p)
-           }
-         } else if (arguments.length === 2) {
-           var x = arguments[0];
-           var y = arguments[1];
-           return this.covers(x, y)
-         }
-       };
-       Envelope.prototype.centre = function centre () {
-         if (this.isNull()) { return null }
-         return new Coordinate((this.getMinX() + this.getMaxX()) / 2.0, (this.getMinY() + this.getMaxY()) / 2.0)
-       };
-       Envelope.prototype.init = function init () {
-         if (arguments.length === 0) {
-           this.setToNull();
-         } else if (arguments.length === 1) {
-           if (arguments[0] instanceof Coordinate) {
-             var p = arguments[0];
-             this.init(p.x, p.x, p.y, p.y);
-           } else if (arguments[0] instanceof Envelope) {
-             var env = arguments[0];
-             this._minx = env._minx;
-             this._maxx = env._maxx;
-             this._miny = env._miny;
-             this._maxy = env._maxy;
-           }
-         } else if (arguments.length === 2) {
-           var p1 = arguments[0];
-           var p2 = arguments[1];
-           this.init(p1.x, p2.x, p1.y, p2.y);
-         } else if (arguments.length === 4) {
-           var x1 = arguments[0];
-           var x2 = arguments[1];
-           var y1 = arguments[2];
-           var y2 = arguments[3];
-           if (x1 < x2) {
-             this._minx = x1;
-             this._maxx = x2;
-           } else {
-             this._minx = x2;
-             this._maxx = x1;
-           }
-           if (y1 < y2) {
-             this._miny = y1;
-             this._maxy = y2;
-           } else {
-             this._miny = y2;
-             this._maxy = y1;
-           }
-         }
-       };
-       Envelope.prototype.getMaxY = function getMaxY () {
-         return this._maxy
-       };
-       Envelope.prototype.distance = function distance (env) {
-         if (this.intersects(env)) { return 0 }
-         var dx = 0.0;
-         if (this._maxx < env._minx) { dx = env._minx - this._maxx; } else if (this._minx > env._maxx) { dx = this._minx - env._maxx; }
-         var dy = 0.0;
-         if (this._maxy < env._miny) { dy = env._miny - this._maxy; } else if (this._miny > env._maxy) { dy = this._miny - env._maxy; }
-         if (dx === 0.0) { return dy }
-         if (dy === 0.0) { return dx }
-         return Math.sqrt(dx * dx + dy * dy)
-       };
-       Envelope.prototype.hashCode = function hashCode () {
-         var result = 17;
-         result = 37 * result + Coordinate.hashCode(this._minx);
-         result = 37 * result + Coordinate.hashCode(this._maxx);
-         result = 37 * result + Coordinate.hashCode(this._miny);
-         result = 37 * result + Coordinate.hashCode(this._maxy);
-         return result
-       };
-       Envelope.prototype.interfaces_ = function interfaces_ () {
-         return [Comparable, Serializable]
-       };
-       Envelope.prototype.getClass = function getClass () {
-         return Envelope
-       };
-       Envelope.intersects = function intersects () {
-         if (arguments.length === 3) {
-           var p1 = arguments[0];
-           var p2 = arguments[1];
-           var q = arguments[2];
-           if (q.x >= (p1.x < p2.x ? p1.x : p2.x) && q.x <= (p1.x > p2.x ? p1.x : p2.x) && (q.y >= (p1.y < p2.y ? p1.y : p2.y) && q.y <= (p1.y > p2.y ? p1.y : p2.y))) {
-             return true
-           }
-           return false
-         } else if (arguments.length === 4) {
-           var p1$1 = arguments[0];
-           var p2$1 = arguments[1];
-           var q1 = arguments[2];
-           var q2 = arguments[3];
-           var minq = Math.min(q1.x, q2.x);
-           var maxq = Math.max(q1.x, q2.x);
-           var minp = Math.min(p1$1.x, p2$1.x);
-           var maxp = Math.max(p1$1.x, p2$1.x);
-           if (minp > maxq) { return false }
-           if (maxp < minq) { return false }
-           minq = Math.min(q1.y, q2.y);
-           maxq = Math.max(q1.y, q2.y);
-           minp = Math.min(p1$1.y, p2$1.y);
-           maxp = Math.max(p1$1.y, p2$1.y);
-           if (minp > maxq) { return false }
-           if (maxp < minq) { return false }
-           return true
-         }
-       };
-       staticAccessors$9.serialVersionUID.get = function () { return 5873921885273102420 };
+         function loadLanguagesArray(dataLanguages) {
+           if (_languagesArray.length !== 0) return; // some conversion is needed to ensure correct OSM tags are used
 
-       Object.defineProperties( Envelope, staticAccessors$9 );
+           var replacements = {
+             sr: 'sr-Cyrl',
+             // in OSM, `sr` implies Cyrillic
+             'sr-Cyrl': false // `sr-Cyrl` isn't used in OSM
 
-       var regExes = {
-         'typeStr': /^\s*(\w+)\s*\(\s*(.*)\s*\)\s*$/,
-         'emptyTypeStr': /^\s*(\w+)\s*EMPTY\s*$/,
-         'spaces': /\s+/,
-         'parenComma': /\)\s*,\s*\(/,
-         'doubleParenComma': /\)\s*\)\s*,\s*\(\s*\(/, // can't use {2} here
-         'trimParens': /^\s*\(?(.*?)\)?\s*$/
-       };
+           };
 
-       /**
-        * Class for reading and writing Well-Known Text.
-        *
-        * NOTE: Adapted from OpenLayers 2.11 implementation.
-        */
+           for (var code in dataLanguages) {
+             if (replacements[code] === false) continue;
+             var metaCode = code;
+             if (replacements[code]) metaCode = replacements[code];
 
-       /** Create a new parser for WKT
-        *
-        * @param {GeometryFactory} geometryFactory
-        * @return An instance of WKTParser.
-        * @constructor
-        * @private
-        */
-       var WKTParser = function WKTParser (geometryFactory) {
-         this.geometryFactory = geometryFactory || new GeometryFactory();
-       };
-       /**
-        * Deserialize a WKT string and return a geometry. Supports WKT for POINT,
-        * MULTIPOINT, LINESTRING, LINEARRING, MULTILINESTRING, POLYGON, MULTIPOLYGON,
-        * and GEOMETRYCOLLECTION.
-        *
-        * @param {String} wkt A WKT string.
-        * @return {Geometry} A geometry instance.
-        * @private
-        */
-       WKTParser.prototype.read = function read (wkt) {
-         var geometry, type, str;
-         wkt = wkt.replace(/[\n\r]/g, ' ');
-         var matches = regExes.typeStr.exec(wkt);
-         if (wkt.search('EMPTY') !== -1) {
-           matches = regExes.emptyTypeStr.exec(wkt);
-           matches[2] = undefined;
-         }
-         if (matches) {
-           type = matches[1].toLowerCase();
-           str = matches[2];
-           if (parse$1[type]) {
-             geometry = parse$1[type].apply(this, [str]);
+             _languagesArray.push({
+               localName: _mainLocalizer.languageName(metaCode, {
+                 localOnly: true
+               }),
+               nativeName: dataLanguages[metaCode].nativeName,
+               code: code,
+               label: _mainLocalizer.languageName(metaCode)
+             });
            }
          }
 
-         if (geometry === undefined) { throw new Error('Could not parse WKT ' + wkt) }
+         function calcLocked() {
+           // only lock the Name field
+           var isLocked = field.id === 'name' && _entityIDs.length && // lock the field if any feature needs it
+           _entityIDs.some(function (entityID) {
+             var entity = context.graph().hasEntity(entityID);
+             if (!entity) return false;
 
-         return geometry
-       };
+             var original = context.graph().base().entities[_entityIDs[0]];
 
-       /**
-        * Serialize a geometry into a WKT string.
-        *
-        * @param {Geometry} geometry A feature or array of features.
-        * @return {String} The WKT string representation of the input geometries.
-        * @private
-        */
-       WKTParser.prototype.write = function write (geometry) {
-         return this.extractGeometry(geometry)
-       };
+             var hasOriginalName = original && entity.tags.name && entity.tags.name === original.tags.name; // if the name was already edited manually then allow further editing
 
-       /**
-        * Entry point to construct the WKT for a single Geometry object.
-        *
-        * @param {Geometry} geometry
-        * @return {String} A WKT string of representing the geometry.
-        * @private
-        */
-       WKTParser.prototype.extractGeometry = function extractGeometry (geometry) {
-         var type = geometry.getGeometryType().toLowerCase();
-         if (!extract$1[type]) {
-           return null
-         }
-         var wktType = type.toUpperCase();
-         var data;
-         if (geometry.isEmpty()) {
-           data = wktType + ' EMPTY';
-         } else {
-           data = wktType + '(' + extract$1[type].apply(this, [geometry]) + ')';
-         }
-         return data
-       };
+             if (!hasOriginalName) return false; // features linked to Wikidata are likely important and should be protected
 
-       /**
-        * Object with properties corresponding to the geometry types. Property values
-        * are functions that do the actual data extraction.
-        * @private
-        */
-       var extract$1 = {
-         coordinate: function coordinate (coordinate$1) {
-           return coordinate$1.x + ' ' + coordinate$1.y
-         },
+             if (entity.tags.wikidata) return true; // assume the name has already been confirmed if its source has been researched
 
-         /**
-          * Return a space delimited string of point coordinates.
-          *
-          * @param {Point}
-          *          point
-          * @return {String} A string of coordinates representing the point.
-          */
-         point: function point (point$1) {
-           return extract$1.coordinate.call(this, point$1._coordinates._coordinates[0])
-         },
+             if (entity.tags['name:etymology:wikidata']) return true;
+             var preset = _mainPresetIndex.match(entity, context.graph());
+             var isSuggestion = preset && preset.suggestion;
+             var showsBrand = preset && preset.originalFields.filter(function (d) {
+               return d.id === 'brand';
+             }).length; // protect standardized brand names
+
+             return isSuggestion && !showsBrand;
+           });
+
+           field.locked(isLocked);
+         } // update _multilingual, maintaining the existing order
+
+
+         function calcMultilingual(tags) {
+           var existingLangsOrdered = _multilingual.map(function (item) {
+             return item.lang;
+           });
+
+           var existingLangs = new Set(existingLangsOrdered.filter(Boolean));
+
+           for (var k in tags) {
+             var m = k.match(/^(.*):([a-zA-Z_-]+)$/);
+
+             if (m && m[1] === field.key && m[2]) {
+               var item = {
+                 lang: m[2],
+                 value: tags[k]
+               };
+
+               if (existingLangs.has(item.lang)) {
+                 // update the value
+                 _multilingual[existingLangsOrdered.indexOf(item.lang)].value = item.value;
+                 existingLangs["delete"](item.lang);
+               } else {
+                 _multilingual.push(item);
+               }
+             }
+           }
+
+           _multilingual = _multilingual.filter(function (item) {
+             return !item.lang || !existingLangs.has(item.lang);
+           });
+         }
 
-         /**
-          * Return a comma delimited string of point coordinates from a multipoint.
-          *
-          * @param {MultiPoint}
-          *          multipoint
-          * @return {String} A string of point coordinate strings representing the
-          *         multipoint.
-          */
-         multipoint: function multipoint (multipoint$1) {
-           var this$1 = this;
+         function localized(selection) {
+           _selection = selection;
+           calcLocked();
+           var isLocked = field.locked();
+           var singularEntity = _entityIDs.length === 1 && context.hasEntity(_entityIDs[0]);
+           var preset = singularEntity && _mainPresetIndex.match(singularEntity, context.graph());
+           var wrap = selection.selectAll('.form-field-input-wrap').data([0]); // enter/update
 
-           var array = [];
-           for (var i = 0, len = multipoint$1._geometries.length; i < len; ++i) {
-             array.push('(' + extract$1.point.apply(this$1, [multipoint$1._geometries[i]]) + ')');
-           }
-           return array.join(',')
-         },
+           wrap = wrap.enter().append('div').attr('class', 'form-field-input-wrap form-field-input-' + field.type).merge(wrap);
+           input = wrap.selectAll('.localized-main').data([0]); // enter/update
 
-         /**
-          * Return a comma delimited string of point coordinates from a line.
-          *
-          * @param {LineString} linestring
-          * @return {String} A string of point coordinate strings representing the linestring.
-          */
-         linestring: function linestring (linestring$1) {
-           var this$1 = this;
+           input = input.enter().append('input').attr('type', 'text').attr('id', field.domId).attr('class', 'localized-main').call(utilNoAuto).merge(input);
 
-           var array = [];
-           for (var i = 0, len = linestring$1._points._coordinates.length; i < len; ++i) {
-             array.push(extract$1.coordinate.apply(this$1, [linestring$1._points._coordinates[i]]));
-           }
-           return array.join(',')
-         },
+           if (preset && field.id === 'name') {
+             var pTag = preset.id.split('/', 2);
+             var pKey = pTag[0];
+             var pValue = pTag[1];
 
-         linearring: function linearring (linearring$1) {
-           var this$1 = this;
+             if (!preset.suggestion) {
+               // Not a suggestion preset - Add a suggestions dropdown if it makes sense to.
+               // This code attempts to determine if the matched preset is the
+               // kind of preset that even can benefit from name suggestions..
+               // - true = shops, cafes, hotels, etc. (also generic and fallback presets)
+               // - false = churches, parks, hospitals, etc. (things not in the index)
+               var isFallback = preset.isFallback();
+               var goodSuggestions = allSuggestions.filter(function (s) {
+                 if (isFallback) return true;
+                 var sTag = s.id.split('/', 2);
+                 var sKey = sTag[0];
+                 var sValue = sTag[1];
+                 return pKey === sKey && (!pValue || pValue === sValue);
+               }); // Show the suggestions.. If the user picks one, change the tags..
 
-           var array = [];
-           for (var i = 0, len = linearring$1._points._coordinates.length; i < len; ++i) {
-             array.push(extract$1.coordinate.apply(this$1, [linearring$1._points._coordinates[i]]));
+               if (allSuggestions.length && goodSuggestions.length) {
+                 input.on('blur.localized', checkBrandOnBlur).call(brandCombo.fetcher(fetchBrandNames(preset, allSuggestions)).on('accept', acceptBrand).on('cancel', cancelBrand));
+               }
+             }
            }
-           return array.join(',')
-         },
 
-         /**
-          * Return a comma delimited string of linestring strings from a
-          * multilinestring.
-          *
-          * @param {MultiLineString} multilinestring
-          * @return {String} A string of of linestring strings representing the multilinestring.
-          */
-         multilinestring: function multilinestring (multilinestring$1) {
-           var this$1 = this;
+           input.classed('disabled', !!isLocked).attr('readonly', isLocked || null).on('input', change(true)).on('blur', change()).on('change', change());
+           var translateButton = wrap.selectAll('.localized-add').data([0]);
+           translateButton = translateButton.enter().append('button').attr('class', 'localized-add form-field-button').call(svgIcon('#iD-icon-plus')).merge(translateButton);
+           translateButton.classed('disabled', !!isLocked).call(isLocked ? _buttonTip.destroy : _buttonTip).on('click', addNew);
 
-           var array = [];
-           for (var i = 0, len = multilinestring$1._geometries.length; i < len; ++i) {
-             array.push('(' +
-               extract$1.linestring.apply(this$1, [multilinestring$1._geometries[i]]) +
-               ')');
+           if (_tags && !_multilingual.length) {
+             calcMultilingual(_tags);
            }
-           return array.join(',')
-         },
 
-         /**
-          * Return a comma delimited string of linear ring arrays from a polygon.
-          *
-          * @param {Polygon} polygon
-          * @return {String} An array of linear ring arrays representing the polygon.
-          */
-         polygon: function polygon (polygon$1) {
-           var this$1 = this;
+           localizedInputs = selection.selectAll('.localized-multilingual').data([0]);
+           localizedInputs = localizedInputs.enter().append('div').attr('class', 'localized-multilingual').merge(localizedInputs);
+           localizedInputs.call(renderMultilingual);
+           localizedInputs.selectAll('button, input').classed('disabled', !!isLocked).attr('readonly', isLocked || null); // We are not guaranteed to get an `accept` or `cancel` when blurring the field.
+           // (This can happen if the user actives the combo, arrows down, and then clicks off to blur)
+           // So compare the current field value against the suggestions one last time.
 
-           var array = [];
-           array.push('(' + extract$1.linestring.apply(this, [polygon$1._shell]) + ')');
-           for (var i = 0, len = polygon$1._holes.length; i < len; ++i) {
-             array.push('(' + extract$1.linestring.apply(this$1, [polygon$1._holes[i]]) + ')');
-           }
-           return array.join(',')
-         },
+           function checkBrandOnBlur() {
+             var latest = _entityIDs.length === 1 && context.hasEntity(_entityIDs[0]);
+             if (!latest) return; // deleting the entity blurred the field?
 
-         /**
-          * Return an array of polygon arrays from a multipolygon.
-          *
-          * @param {MultiPolygon} multipolygon
-          * @return {String} An array of polygon arrays representing the multipolygon.
-          */
-         multipolygon: function multipolygon (multipolygon$1) {
-           var this$1 = this;
+             var preset = _mainPresetIndex.match(latest, context.graph());
+             if (preset && preset.suggestion) return; // already accepted
 
-           var array = [];
-           for (var i = 0, len = multipolygon$1._geometries.length; i < len; ++i) {
-             array.push('(' + extract$1.polygon.apply(this$1, [multipolygon$1._geometries[i]]) + ')');
+             var name = utilGetSetValue(input).trim();
+             var matched = allSuggestions.filter(function (s) {
+               return name === s.name();
+             });
+
+             if (matched.length === 1) {
+               acceptBrand({
+                 suggestion: matched[0]
+               });
+             } else {
+               cancelBrand();
+             }
            }
-           return array.join(',')
-         },
 
-         /**
-          * Return the WKT portion between 'GEOMETRYCOLLECTION(' and ')' for an
-          * geometrycollection.
-          *
-          * @param {GeometryCollection} collection
-          * @return {String} internal WKT representation of the collection.
-          */
-         geometrycollection: function geometrycollection (collection) {
-           var this$1 = this;
+           function acceptBrand(d) {
+             var entity = _entityIDs.length === 1 && context.hasEntity(_entityIDs[0]);
 
-           var array = [];
-           for (var i = 0, len = collection._geometries.length; i < len; ++i) {
-             array.push(this$1.extractGeometry(collection._geometries[i]));
-           }
-           return array.join(',')
-         }
-       };
+             if (!d || !entity) {
+               cancelBrand();
+               return;
+             }
 
-       /**
-        * Object with properties corresponding to the geometry types. Property values
-        * are functions that do the actual parsing.
-        * @private
-        */
-       var parse$1 = {
-         /**
-          * Return point geometry given a point WKT fragment.
-          *
-          * @param {String} str A WKT fragment representing the point.
-          * @return {Point} A point geometry.
-          * @private
-          */
-         point: function point (str) {
-           if (str === undefined) {
-             return this.geometryFactory.createPoint()
-           }
+             var tags = entity.tags;
+             var geometry = entity.geometry(context.graph());
+             var removed = preset.unsetTags(tags, geometry);
 
-           var coords = str.trim().split(regExes.spaces);
-           return this.geometryFactory.createPoint(new Coordinate(Number.parseFloat(coords[0]),
-             Number.parseFloat(coords[1])))
-         },
+             for (var k in tags) {
+               tags[k] = removed[k]; // set removed tags to `undefined`
+             }
 
-         /**
-          * Return a multipoint geometry given a multipoint WKT fragment.
-          *
-          * @param {String} str A WKT fragment representing the multipoint.
-          * @return {Point} A multipoint feature.
-          * @private
-          */
-         multipoint: function multipoint (str) {
-           var this$1 = this;
+             tags = d.suggestion.setTags(tags, geometry);
+             utilGetSetValue(input, tags.name);
+             dispatch$1.call('change', this, tags);
+           } // user hit escape
 
-           if (str === undefined) {
-             return this.geometryFactory.createMultiPoint()
-           }
 
-           var point;
-           var points = str.trim().split(',');
-           var components = [];
-           for (var i = 0, len = points.length; i < len; ++i) {
-             point = points[i].replace(regExes.trimParens, '$1');
-             components.push(parse$1.point.apply(this$1, [point]));
+           function cancelBrand() {
+             var name = utilGetSetValue(input);
+             dispatch$1.call('change', this, {
+               name: name
+             });
            }
-           return this.geometryFactory.createMultiPoint(components)
-         },
 
-         /**
-          * Return a linestring geometry given a linestring WKT fragment.
-          *
-          * @param {String} str A WKT fragment representing the linestring.
-          * @return {LineString} A linestring geometry.
-          * @private
-          */
-         linestring: function linestring (str) {
-           if (str === undefined) {
-             return this.geometryFactory.createLineString()
-           }
+           function fetchBrandNames(preset, suggestions) {
+             var pTag = preset.id.split('/', 2);
+             var pKey = pTag[0];
+             var pValue = pTag[1];
+             return function (value, callback) {
+               var results = [];
 
-           var points = str.trim().split(',');
-           var components = [];
-           var coords;
-           for (var i = 0, len = points.length; i < len; ++i) {
-             coords = points[i].trim().split(regExes.spaces);
-             components.push(new Coordinate(Number.parseFloat(coords[0]), Number.parseFloat(coords[1])));
-           }
-           return this.geometryFactory.createLineString(components)
-         },
+               if (value && value.length > 2) {
+                 for (var i = 0; i < suggestions.length; i++) {
+                   var s = suggestions[i]; // don't suggest brands from incompatible countries
+
+                   if (_countryCode && s.countryCodes && s.countryCodes.indexOf(_countryCode) === -1) continue;
+                   var sTag = s.id.split('/', 2);
+                   var sKey = sTag[0];
+                   var sValue = sTag[1];
+                   var subtitle = s.subtitle();
+                   var name = s.name();
+                   if (subtitle) name += ' – ' + subtitle;
+                   var dist = utilEditDistance(value, name.substring(0, value.length));
+                   var matchesPreset = pKey === sKey && (!pValue || pValue === sValue);
+
+                   if (dist < 1 || matchesPreset && dist < 3) {
+                     var obj = {
+                       value: s.name(),
+                       title: name,
+                       display: s.nameLabel() + (subtitle ? ' – ' + s.subtitleLabel() : ''),
+                       suggestion: s,
+                       dist: dist + (matchesPreset ? 0 : 1) // penalize if not matched preset
+
+                     };
+                     results.push(obj);
+                   }
+                 }
 
-         /**
-          * Return a linearring geometry given a linearring WKT fragment.
-          *
-          * @param {String} str A WKT fragment representing the linearring.
-          * @return {LinearRing} A linearring geometry.
-          * @private
-          */
-         linearring: function linearring (str) {
-           if (str === undefined) {
-             return this.geometryFactory.createLinearRing()
-           }
+                 results.sort(function (a, b) {
+                   return a.dist - b.dist;
+                 });
+               }
 
-           var points = str.trim().split(',');
-           var components = [];
-           var coords;
-           for (var i = 0, len = points.length; i < len; ++i) {
-             coords = points[i].trim().split(regExes.spaces);
-             components.push(new Coordinate(Number.parseFloat(coords[0]), Number.parseFloat(coords[1])));
+               results = results.slice(0, 10);
+               callback(results);
+             };
            }
-           return this.geometryFactory.createLinearRing(components)
-         },
 
-         /**
-          * Return a multilinestring geometry given a multilinestring WKT fragment.
-          *
-          * @param {String} str A WKT fragment representing the multilinestring.
-          * @return {MultiLineString} A multilinestring geometry.
-          * @private
-          */
-         multilinestring: function multilinestring (str) {
-           var this$1 = this;
+           function addNew(d3_event) {
+             d3_event.preventDefault();
+             if (field.locked()) return;
+             var defaultLang = _mainLocalizer.languageCode().toLowerCase();
 
-           if (str === undefined) {
-             return this.geometryFactory.createMultiLineString()
-           }
+             var langExists = _multilingual.find(function (datum) {
+               return datum.lang === defaultLang;
+             });
 
-           var line;
-           var lines = str.trim().split(regExes.parenComma);
-           var components = [];
-           for (var i = 0, len = lines.length; i < len; ++i) {
-             line = lines[i].replace(regExes.trimParens, '$1');
-             components.push(parse$1.linestring.apply(this$1, [line]));
-           }
-           return this.geometryFactory.createMultiLineString(components)
-         },
+             var isLangEn = defaultLang.indexOf('en') > -1;
 
-         /**
-          * Return a polygon geometry given a polygon WKT fragment.
-          *
-          * @param {String} str A WKT fragment representing the polygon.
-          * @return {Polygon} A polygon geometry.
-          * @private
-          */
-         polygon: function polygon (str) {
-           var this$1 = this;
+             if (isLangEn || langExists) {
+               defaultLang = '';
+               langExists = _multilingual.find(function (datum) {
+                 return datum.lang === defaultLang;
+               });
+             }
 
-           if (str === undefined) {
-             return this.geometryFactory.createPolygon()
-           }
+             if (!langExists) {
+               // prepend the value so it appears at the top
+               _multilingual.unshift({
+                 lang: defaultLang,
+                 value: ''
+               });
 
-           var ring, linestring, linearring;
-           var rings = str.trim().split(regExes.parenComma);
-           var shell;
-           var holes = [];
-           for (var i = 0, len = rings.length; i < len; ++i) {
-             ring = rings[i].replace(regExes.trimParens, '$1');
-             linestring = parse$1.linestring.apply(this$1, [ring]);
-             linearring = this$1.geometryFactory.createLinearRing(linestring._points);
-             if (i === 0) {
-               shell = linearring;
-             } else {
-               holes.push(linearring);
+               localizedInputs.call(renderMultilingual);
              }
            }
-           return this.geometryFactory.createPolygon(shell, holes)
-         },
 
-         /**
-          * Return a multipolygon geometry given a multipolygon WKT fragment.
-          *
-          * @param {String} str A WKT fragment representing the multipolygon.
-          * @return {MultiPolygon} A multipolygon geometry.
-          * @private
-          */
-         multipolygon: function multipolygon (str) {
-           var this$1 = this;
+           function change(onInput) {
+             return function (d3_event) {
+               if (field.locked()) {
+                 d3_event.preventDefault();
+                 return;
+               }
 
-           if (str === undefined) {
-             return this.geometryFactory.createMultiPolygon()
-           }
+               var val = utilGetSetValue(select(this));
+               if (!onInput) val = context.cleanTagValue(val); // don't override multiple values with blank string
 
-           var polygon;
-           var polygons = str.trim().split(regExes.doubleParenComma);
-           var components = [];
-           for (var i = 0, len = polygons.length; i < len; ++i) {
-             polygon = polygons[i].replace(regExes.trimParens, '$1');
-             components.push(parse$1.polygon.apply(this$1, [polygon]));
+               if (!val && Array.isArray(_tags[field.key])) return;
+               var t = {};
+               t[field.key] = val || undefined;
+               dispatch$1.call('change', this, t, onInput);
+             };
            }
-           return this.geometryFactory.createMultiPolygon(components)
-         },
+         }
 
-         /**
-          * Return a geometrycollection given a geometrycollection WKT fragment.
-          *
-          * @param {String} str A WKT fragment representing the geometrycollection.
-          * @return {GeometryCollection}
-          * @private
-          */
-         geometrycollection: function geometrycollection (str) {
-           var this$1 = this;
+         function key(lang) {
+           return field.key + ':' + lang;
+         }
 
-           if (str === undefined) {
-             return this.geometryFactory.createGeometryCollection()
-           }
+         function changeLang(d3_event, d) {
+           var tags = {}; // make sure unrecognized suffixes are lowercase - #7156
+
+           var lang = utilGetSetValue(select(this)).toLowerCase();
 
-           // separate components of the collection with |
-           str = str.replace(/,\s*([A-Za-z])/g, '|$1');
-           var wktArray = str.trim().split('|');
-           var components = [];
-           for (var i = 0, len = wktArray.length; i < len; ++i) {
-             components.push(this$1.read(wktArray[i]));
+           var language = _languagesArray.find(function (d) {
+             return d.label.toLowerCase() === lang || d.localName && d.localName.toLowerCase() === lang || d.nativeName && d.nativeName.toLowerCase() === lang;
+           });
+
+           if (language) lang = language.code;
+
+           if (d.lang && d.lang !== lang) {
+             tags[key(d.lang)] = undefined;
            }
-           return this.geometryFactory.createGeometryCollection(components)
-         }
-       };
 
-       /**
-        * Writes the Well-Known Text representation of a {@link Geometry}. The
-        * Well-Known Text format is defined in the <A
-        * HREF="http://www.opengis.org/techno/specs.htm"> OGC Simple Features
-        * Specification for SQL</A>.
-        * <p>
-        * The <code>WKTWriter</code> outputs coordinates rounded to the precision
-        * model. Only the maximum number of decimal places necessary to represent the
-        * ordinates to the required precision will be output.
-        * <p>
-        * The SFS WKT spec does not define a special tag for {@link LinearRing}s.
-        * Under the spec, rings are output as <code>LINESTRING</code>s.
-        */
+           var newKey = lang && context.cleanTagKey(key(lang));
+           var value = utilGetSetValue(select(this.parentNode).selectAll('.localized-value'));
 
-       /**
-        * @param {GeometryFactory} geometryFactory
-        * @constructor
-        */
-       var WKTWriter = function WKTWriter (geometryFactory) {
-         this.parser = new WKTParser(geometryFactory);
-       };
+           if (newKey && value) {
+             tags[newKey] = value;
+           } else if (newKey && _wikiTitles && _wikiTitles[d.lang]) {
+             tags[newKey] = _wikiTitles[d.lang];
+           }
 
-       /**
-        * Converts a <code>Geometry</code> to its Well-known Text representation.
-        *
-        * @param {Geometry} geometry a <code>Geometry</code> to process.
-        * @return {string} a <Geometry Tagged Text> string (see the OpenGIS Simple
-        *       Features Specification).
-        * @memberof WKTWriter
-        */
-       WKTWriter.prototype.write = function write (geometry) {
-         return this.parser.write(geometry)
-       };
-       /**
-        * Generates the WKT for a <tt>LINESTRING</tt> specified by two
-        * {@link Coordinate}s.
-        *
-        * @param p0 the first coordinate.
-        * @param p1 the second coordinate.
-        *
-        * @return the WKT.
-        * @private
-        */
-       WKTWriter.toLineString = function toLineString (p0, p1) {
-         if (arguments.length !== 2) {
-           throw new Error('Not implemented')
+           d.lang = lang;
+           dispatch$1.call('change', this, tags);
          }
-         return 'LINESTRING ( ' + p0.x + ' ' + p0.y + ', ' + p1.x + ' ' + p1.y + ' )'
-       };
 
-       var RuntimeException = (function (Error) {
-         function RuntimeException (message) {
-           Error.call(this, message);
-           this.name = 'RuntimeException';
-           this.message = message;
-           this.stack = (new Error()).stack;
+         function changeValue(d3_event, d) {
+           if (!d.lang) return;
+           var value = context.cleanTagValue(utilGetSetValue(select(this))) || undefined; // don't override multiple values with blank string
+
+           if (!value && Array.isArray(d.value)) return;
+           var t = {};
+           t[key(d.lang)] = value;
+           d.value = value;
+           dispatch$1.call('change', this, t);
          }
 
-         if ( Error ) RuntimeException.__proto__ = Error;
-         RuntimeException.prototype = Object.create( Error && Error.prototype );
-         RuntimeException.prototype.constructor = RuntimeException;
+         function fetchLanguages(value, cb) {
+           var v = value.toLowerCase(); // show the user's language first
 
-         return RuntimeException;
-       }(Error));
+           var langCodes = [_mainLocalizer.localeCode(), _mainLocalizer.languageCode()];
 
-       var AssertionFailedException = (function (RuntimeException$$1) {
-         function AssertionFailedException () {
-           RuntimeException$$1.call(this);
-           if (arguments.length === 0) {
-             RuntimeException$$1.call(this);
-           } else if (arguments.length === 1) {
-             var message = arguments[0];
-             RuntimeException$$1.call(this, message);
+           if (_countryCode && _territoryLanguages[_countryCode]) {
+             langCodes = langCodes.concat(_territoryLanguages[_countryCode]);
            }
+
+           var langItems = [];
+           langCodes.forEach(function (code) {
+             var langItem = _languagesArray.find(function (item) {
+               return item.code === code;
+             });
+
+             if (langItem) langItems.push(langItem);
+           });
+           langItems = utilArrayUniq(langItems.concat(_languagesArray));
+           cb(langItems.filter(function (d) {
+             return d.label.toLowerCase().indexOf(v) >= 0 || d.localName && d.localName.toLowerCase().indexOf(v) >= 0 || d.nativeName && d.nativeName.toLowerCase().indexOf(v) >= 0 || d.code.toLowerCase().indexOf(v) >= 0;
+           }).map(function (d) {
+             return {
+               value: d.label
+             };
+           }));
          }
 
-         if ( RuntimeException$$1 ) AssertionFailedException.__proto__ = RuntimeException$$1;
-         AssertionFailedException.prototype = Object.create( RuntimeException$$1 && RuntimeException$$1.prototype );
-         AssertionFailedException.prototype.constructor = AssertionFailedException;
-         AssertionFailedException.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         AssertionFailedException.prototype.getClass = function getClass () {
-           return AssertionFailedException
-         };
+         function renderMultilingual(selection) {
+           var entries = selection.selectAll('div.entry').data(_multilingual, function (d) {
+             return d.lang;
+           });
+           entries.exit().style('top', '0').style('max-height', '240px').transition().duration(200).style('opacity', '0').style('max-height', '0px').remove();
+           var entriesEnter = entries.enter().append('div').attr('class', 'entry').each(function (_, index) {
+             var wrap = select(this);
+             var domId = utilUniqueDomId(index);
+             var label = wrap.append('label').attr('class', 'field-label').attr('for', domId);
+             var text = label.append('span').attr('class', 'label-text');
+             text.append('span').attr('class', 'label-textvalue').html(_t.html('translate.localized_translation_label'));
+             text.append('span').attr('class', 'label-textannotation');
+             label.append('button').attr('class', 'remove-icon-multilingual').on('click', function (d3_event, d) {
+               if (field.locked()) return;
+               d3_event.preventDefault();
+
+               if (!d.lang || !d.value) {
+                 _multilingual.splice(index, 1);
+
+                 renderMultilingual(selection);
+               } else {
+                 // remove from entity tags
+                 var t = {};
+                 t[key(d.lang)] = undefined;
+                 dispatch$1.call('change', this, t);
+               }
+             }).call(svgIcon('#iD-operation-delete'));
+             wrap.append('input').attr('class', 'localized-lang').attr('id', domId).attr('type', 'text').attr('placeholder', _t('translate.localized_translation_language')).on('blur', changeLang).on('change', changeLang).call(langCombo);
+             wrap.append('input').attr('type', 'text').attr('class', 'localized-value').on('blur', changeValue).on('change', changeValue);
+           });
+           entriesEnter.style('margin-top', '0px').style('max-height', '0px').style('opacity', '0').transition().duration(200).style('margin-top', '10px').style('max-height', '240px').style('opacity', '1').on('end', function () {
+             select(this).style('max-height', '').style('overflow', 'visible');
+           });
+           entries = entries.merge(entriesEnter);
+           entries.order();
+           entries.classed('present', function (d) {
+             return d.lang && d.value;
+           });
+           utilGetSetValue(entries.select('.localized-lang'), function (d) {
+             return _mainLocalizer.languageName(d.lang);
+           });
+           utilGetSetValue(entries.select('.localized-value'), function (d) {
+             return typeof d.value === 'string' ? d.value : '';
+           }).attr('title', function (d) {
+             return Array.isArray(d.value) ? d.value.filter(Boolean).join('\n') : null;
+           }).attr('placeholder', function (d) {
+             return Array.isArray(d.value) ? _t('inspector.multiple_values') : _t('translate.localized_translation_name');
+           }).classed('mixed', function (d) {
+             return Array.isArray(d.value);
+           });
+         }
 
-         return AssertionFailedException;
-       }(RuntimeException));
+         localized.tags = function (tags) {
+           _tags = tags; // Fetch translations from wikipedia
 
-       var Assert = function Assert () {};
+           if (typeof tags.wikipedia === 'string' && !_wikiTitles) {
+             _wikiTitles = {};
+             var wm = tags.wikipedia.match(/([^:]+):(.+)/);
 
-       Assert.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       Assert.prototype.getClass = function getClass () {
-         return Assert
-       };
-       Assert.shouldNeverReachHere = function shouldNeverReachHere () {
-         if (arguments.length === 0) {
-           Assert.shouldNeverReachHere(null);
-         } else if (arguments.length === 1) {
-           var message = arguments[0];
-           throw new AssertionFailedException('Should never reach here' + (message !== null ? ': ' + message : ''))
-         }
-       };
-       Assert.isTrue = function isTrue () {
-         var assertion;
-         var message;
-         if (arguments.length === 1) {
-           assertion = arguments[0];
-           Assert.isTrue(assertion, null);
-         } else if (arguments.length === 2) {
-           assertion = arguments[0];
-           message = arguments[1];
-           if (!assertion) {
-             if (message === null) {
-               throw new AssertionFailedException()
-             } else {
-               throw new AssertionFailedException(message)
+             if (wm && wm[0] && wm[1]) {
+               wikipedia.translations(wm[1], wm[2], function (err, d) {
+                 if (err || !d) return;
+                 _wikiTitles = d;
+               });
              }
            }
+
+           var isMixed = Array.isArray(tags[field.key]);
+           utilGetSetValue(input, typeof tags[field.key] === 'string' ? tags[field.key] : '').attr('title', isMixed ? tags[field.key].filter(Boolean).join('\n') : undefined).attr('placeholder', isMixed ? _t('inspector.multiple_values') : field.placeholder()).classed('mixed', isMixed);
+           calcMultilingual(tags);
+
+           _selection.call(localized);
+         };
+
+         localized.focus = function () {
+           input.node().focus();
+         };
+
+         localized.entityIDs = function (val) {
+           if (!arguments.length) return _entityIDs;
+           _entityIDs = val;
+           _multilingual = [];
+           loadCountryCode();
+           return localized;
+         };
+
+         function loadCountryCode() {
+           var extent = combinedEntityExtent();
+           var countryCode = extent && iso1A2Code(extent.center());
+           _countryCode = countryCode && countryCode.toLowerCase();
          }
-       };
-       Assert.equals = function equals () {
-         var expectedValue;
-         var actualValue;
-         var message;
-         if (arguments.length === 2) {
-           expectedValue = arguments[0];
-           actualValue = arguments[1];
-           Assert.equals(expectedValue, actualValue, null);
-         } else if (arguments.length === 3) {
-           expectedValue = arguments[0];
-           actualValue = arguments[1];
-           message = arguments[2];
-           if (!actualValue.equals(expectedValue)) {
-             throw new AssertionFailedException('Expected ' + expectedValue + ' but encountered ' + actualValue + (message !== null ? ': ' + message : ''))
-           }
+
+         function combinedEntityExtent() {
+           return _entityIDs && _entityIDs.length && utilTotalExtent(_entityIDs, context.graph());
          }
-       };
 
-       var LineIntersector = function LineIntersector () {
-         this._result = null;
-         this._inputLines = Array(2).fill().map(function () { return Array(2); });
-         this._intPt = new Array(2).fill(null);
-         this._intLineIndex = null;
-         this._isProper = null;
-         this._pa = null;
-         this._pb = null;
-         this._precisionModel = null;
-         this._intPt[0] = new Coordinate();
-         this._intPt[1] = new Coordinate();
-         this._pa = this._intPt[0];
-         this._pb = this._intPt[1];
-         this._result = 0;
-       };
+         return utilRebind(localized, dispatch$1, 'on');
+       }
 
-       var staticAccessors$10 = { DONT_INTERSECT: { configurable: true },DO_INTERSECT: { configurable: true },COLLINEAR: { configurable: true },NO_INTERSECTION: { configurable: true },POINT_INTERSECTION: { configurable: true },COLLINEAR_INTERSECTION: { configurable: true } };
-       LineIntersector.prototype.getIndexAlongSegment = function getIndexAlongSegment (segmentIndex, intIndex) {
-         this.computeIntLineIndex();
-         return this._intLineIndex[segmentIndex][intIndex]
-       };
-       LineIntersector.prototype.getTopologySummary = function getTopologySummary () {
-         var catBuf = new StringBuffer();
-         if (this.isEndPoint()) { catBuf.append(' endpoint'); }
-         if (this._isProper) { catBuf.append(' proper'); }
-         if (this.isCollinear()) { catBuf.append(' collinear'); }
-         return catBuf.toString()
-       };
-       LineIntersector.prototype.computeIntersection = function computeIntersection (p1, p2, p3, p4) {
-         this._inputLines[0][0] = p1;
-         this._inputLines[0][1] = p2;
-         this._inputLines[1][0] = p3;
-         this._inputLines[1][1] = p4;
-         this._result = this.computeIntersect(p1, p2, p3, p4);
-       };
-       LineIntersector.prototype.getIntersectionNum = function getIntersectionNum () {
-         return this._result
-       };
-       LineIntersector.prototype.computeIntLineIndex = function computeIntLineIndex () {
-         if (arguments.length === 0) {
-           if (this._intLineIndex === null) {
-             this._intLineIndex = Array(2).fill().map(function () { return Array(2); });
-             this.computeIntLineIndex(0);
-             this.computeIntLineIndex(1);
-           }
-         } else if (arguments.length === 1) {
-           var segmentIndex = arguments[0];
-           var dist0 = this.getEdgeDistance(segmentIndex, 0);
-           var dist1 = this.getEdgeDistance(segmentIndex, 1);
-           if (dist0 > dist1) {
-             this._intLineIndex[segmentIndex][0] = 0;
-             this._intLineIndex[segmentIndex][1] = 1;
-           } else {
-             this._intLineIndex[segmentIndex][0] = 1;
-             this._intLineIndex[segmentIndex][1] = 0;
+       function uiFieldMaxspeed(field, context) {
+         var dispatch$1 = dispatch('change');
+         var unitInput = select(null);
+         var input = select(null);
+         var _entityIDs = [];
+
+         var _tags;
+
+         var _isImperial;
+
+         var speedCombo = uiCombobox(context, 'maxspeed');
+         var unitCombo = uiCombobox(context, 'maxspeed-unit').data(['km/h', 'mph'].map(comboValues));
+         var metricValues = [20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120];
+         var imperialValues = [5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80];
+
+         function maxspeed(selection) {
+           var wrap = selection.selectAll('.form-field-input-wrap').data([0]);
+           wrap = wrap.enter().append('div').attr('class', 'form-field-input-wrap form-field-input-' + field.type).merge(wrap);
+           input = wrap.selectAll('input.maxspeed-number').data([0]);
+           input = input.enter().append('input').attr('type', 'text').attr('class', 'maxspeed-number').attr('id', field.domId).call(utilNoAuto).call(speedCombo).merge(input);
+           input.on('change', change).on('blur', change);
+           var loc = combinedEntityExtent().center();
+           _isImperial = roadSpeedUnit(loc) === 'mph';
+           unitInput = wrap.selectAll('input.maxspeed-unit').data([0]);
+           unitInput = unitInput.enter().append('input').attr('type', 'text').attr('class', 'maxspeed-unit').call(unitCombo).merge(unitInput);
+           unitInput.on('blur', changeUnits).on('change', changeUnits);
+
+           function changeUnits() {
+             _isImperial = utilGetSetValue(unitInput) === 'mph';
+             utilGetSetValue(unitInput, _isImperial ? 'mph' : 'km/h');
+             setUnitSuggestions();
+             change();
            }
          }
-       };
-       LineIntersector.prototype.isProper = function isProper () {
-         return this.hasIntersection() && this._isProper
-       };
-       LineIntersector.prototype.setPrecisionModel = function setPrecisionModel (precisionModel) {
-         this._precisionModel = precisionModel;
-       };
-       LineIntersector.prototype.isInteriorIntersection = function isInteriorIntersection () {
-           var this$1 = this;
 
-         if (arguments.length === 0) {
-           if (this.isInteriorIntersection(0)) { return true }
-           if (this.isInteriorIntersection(1)) { return true }
-           return false
-         } else if (arguments.length === 1) {
-           var inputLineIndex = arguments[0];
-           for (var i = 0; i < this._result; i++) {
-             if (!(this$1._intPt[i].equals2D(this$1._inputLines[inputLineIndex][0]) || this$1._intPt[i].equals2D(this$1._inputLines[inputLineIndex][1]))) {
-               return true
-             }
-           }
-           return false
+         function setUnitSuggestions() {
+           speedCombo.data((_isImperial ? imperialValues : metricValues).map(comboValues));
+           utilGetSetValue(unitInput, _isImperial ? 'mph' : 'km/h');
          }
-       };
-       LineIntersector.prototype.getIntersection = function getIntersection (intIndex) {
-         return this._intPt[intIndex]
-       };
-       LineIntersector.prototype.isEndPoint = function isEndPoint () {
-         return this.hasIntersection() && !this._isProper
-       };
-       LineIntersector.prototype.hasIntersection = function hasIntersection () {
-         return this._result !== LineIntersector.NO_INTERSECTION
-       };
-       LineIntersector.prototype.getEdgeDistance = function getEdgeDistance (segmentIndex, intIndex) {
-         var dist = LineIntersector.computeEdgeDistance(this._intPt[intIndex], this._inputLines[segmentIndex][0], this._inputLines[segmentIndex][1]);
-         return dist
-       };
-       LineIntersector.prototype.isCollinear = function isCollinear () {
-         return this._result === LineIntersector.COLLINEAR_INTERSECTION
-       };
-       LineIntersector.prototype.toString = function toString () {
-         return WKTWriter.toLineString(this._inputLines[0][0], this._inputLines[0][1]) + ' - ' + WKTWriter.toLineString(this._inputLines[1][0], this._inputLines[1][1]) + this.getTopologySummary()
-       };
-       LineIntersector.prototype.getEndpoint = function getEndpoint (segmentIndex, ptIndex) {
-         return this._inputLines[segmentIndex][ptIndex]
-       };
-       LineIntersector.prototype.isIntersection = function isIntersection (pt) {
-           var this$1 = this;
 
-         for (var i = 0; i < this._result; i++) {
-           if (this$1._intPt[i].equals2D(pt)) {
-             return true
-           }
+         function comboValues(d) {
+           return {
+             value: d.toString(),
+             title: d.toString()
+           };
          }
-         return false
-       };
-       LineIntersector.prototype.getIntersectionAlongSegment = function getIntersectionAlongSegment (segmentIndex, intIndex) {
-         this.computeIntLineIndex();
-         return this._intPt[this._intLineIndex[segmentIndex][intIndex]]
-       };
-       LineIntersector.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       LineIntersector.prototype.getClass = function getClass () {
-         return LineIntersector
-       };
-       LineIntersector.computeEdgeDistance = function computeEdgeDistance (p, p0, p1) {
-         var dx = Math.abs(p1.x - p0.x);
-         var dy = Math.abs(p1.y - p0.y);
-         var dist = -1.0;
-         if (p.equals(p0)) {
-           dist = 0.0;
-         } else if (p.equals(p1)) {
-           if (dx > dy) { dist = dx; } else { dist = dy; }
-         } else {
-           var pdx = Math.abs(p.x - p0.x);
-           var pdy = Math.abs(p.y - p0.y);
-           if (dx > dy) { dist = pdx; } else { dist = pdy; }
-           if (dist === 0.0 && !p.equals(p0)) {
-             dist = Math.max(pdx, pdy);
+
+         function change() {
+           var tag = {};
+           var value = utilGetSetValue(input).trim(); // don't override multiple values with blank string
+
+           if (!value && Array.isArray(_tags[field.key])) return;
+
+           if (!value) {
+             tag[field.key] = undefined;
+           } else if (isNaN(value) || !_isImperial) {
+             tag[field.key] = context.cleanTagValue(value);
+           } else {
+             tag[field.key] = context.cleanTagValue(value + ' mph');
            }
+
+           dispatch$1.call('change', this, tag);
          }
-         Assert.isTrue(!(dist === 0.0 && !p.equals(p0)), 'Bad distance calculation');
-         return dist
-       };
-       LineIntersector.nonRobustComputeEdgeDistance = function nonRobustComputeEdgeDistance (p, p1, p2) {
-         var dx = p.x - p1.x;
-         var dy = p.y - p1.y;
-         var dist = Math.sqrt(dx * dx + dy * dy);
-         Assert.isTrue(!(dist === 0.0 && !p.equals(p1)), 'Invalid distance calculation');
-         return dist
-       };
-       staticAccessors$10.DONT_INTERSECT.get = function () { return 0 };
-       staticAccessors$10.DO_INTERSECT.get = function () { return 1 };
-       staticAccessors$10.COLLINEAR.get = function () { return 2 };
-       staticAccessors$10.NO_INTERSECTION.get = function () { return 0 };
-       staticAccessors$10.POINT_INTERSECTION.get = function () { return 1 };
-       staticAccessors$10.COLLINEAR_INTERSECTION.get = function () { return 2 };
-
-       Object.defineProperties( LineIntersector, staticAccessors$10 );
-
-       var RobustLineIntersector = (function (LineIntersector$$1) {
-         function RobustLineIntersector () {
-           LineIntersector$$1.apply(this, arguments);
-         }
-
-         if ( LineIntersector$$1 ) RobustLineIntersector.__proto__ = LineIntersector$$1;
-         RobustLineIntersector.prototype = Object.create( LineIntersector$$1 && LineIntersector$$1.prototype );
-         RobustLineIntersector.prototype.constructor = RobustLineIntersector;
-
-         RobustLineIntersector.prototype.isInSegmentEnvelopes = function isInSegmentEnvelopes (intPt) {
-           var env0 = new Envelope(this._inputLines[0][0], this._inputLines[0][1]);
-           var env1 = new Envelope(this._inputLines[1][0], this._inputLines[1][1]);
-           return env0.contains(intPt) && env1.contains(intPt)
-         };
-         RobustLineIntersector.prototype.computeIntersection = function computeIntersection () {
-           if (arguments.length === 3) {
-             var p = arguments[0];
-             var p1 = arguments[1];
-             var p2 = arguments[2];
-             this._isProper = false;
-             if (Envelope.intersects(p1, p2, p)) {
-               if (CGAlgorithms.orientationIndex(p1, p2, p) === 0 && CGAlgorithms.orientationIndex(p2, p1, p) === 0) {
-                 this._isProper = true;
-                 if (p.equals(p1) || p.equals(p2)) {
-                   this._isProper = false;
-                 }
-                 this._result = LineIntersector$$1.POINT_INTERSECTION;
-                 return null
-               }
-             }
-             this._result = LineIntersector$$1.NO_INTERSECTION;
-           } else { return LineIntersector$$1.prototype.computeIntersection.apply(this, arguments) }
-         };
-         RobustLineIntersector.prototype.normalizeToMinimum = function normalizeToMinimum (n1, n2, n3, n4, normPt) {
-           normPt.x = this.smallestInAbsValue(n1.x, n2.x, n3.x, n4.x);
-           normPt.y = this.smallestInAbsValue(n1.y, n2.y, n3.y, n4.y);
-           n1.x -= normPt.x;
-           n1.y -= normPt.y;
-           n2.x -= normPt.x;
-           n2.y -= normPt.y;
-           n3.x -= normPt.x;
-           n3.y -= normPt.y;
-           n4.x -= normPt.x;
-           n4.y -= normPt.y;
-         };
-         RobustLineIntersector.prototype.safeHCoordinateIntersection = function safeHCoordinateIntersection (p1, p2, q1, q2) {
-           var intPt = null;
-           try {
-             intPt = HCoordinate.intersection(p1, p2, q1, q2);
-           } catch (e) {
-             if (e instanceof NotRepresentableException) {
-               intPt = RobustLineIntersector.nearestEndpoint(p1, p2, q1, q2);
-             } else { throw e }
-           } finally {}
-           return intPt
-         };
-         RobustLineIntersector.prototype.intersection = function intersection (p1, p2, q1, q2) {
-           var intPt = this.intersectionWithNormalization(p1, p2, q1, q2);
-           if (!this.isInSegmentEnvelopes(intPt)) {
-             intPt = new Coordinate(RobustLineIntersector.nearestEndpoint(p1, p2, q1, q2));
-           }
-           if (this._precisionModel !== null) {
-             this._precisionModel.makePrecise(intPt);
-           }
-           return intPt
-         };
-         RobustLineIntersector.prototype.smallestInAbsValue = function smallestInAbsValue (x1, x2, x3, x4) {
-           var x = x1;
-           var xabs = Math.abs(x);
-           if (Math.abs(x2) < xabs) {
-             x = x2;
-             xabs = Math.abs(x2);
-           }
-           if (Math.abs(x3) < xabs) {
-             x = x3;
-             xabs = Math.abs(x3);
-           }
-           if (Math.abs(x4) < xabs) {
-             x = x4;
-           }
-           return x
-         };
-         RobustLineIntersector.prototype.checkDD = function checkDD (p1, p2, q1, q2, intPt) {
-           var intPtDD = CGAlgorithmsDD.intersection(p1, p2, q1, q2);
-           var isIn = this.isInSegmentEnvelopes(intPtDD);
-           System.out.println('DD in env = ' + isIn + '  --------------------- ' + intPtDD);
-           if (intPt.distance(intPtDD) > 0.0001) {
-             System.out.println('Distance = ' + intPt.distance(intPtDD));
-           }
-         };
-         RobustLineIntersector.prototype.intersectionWithNormalization = function intersectionWithNormalization (p1, p2, q1, q2) {
-           var n1 = new Coordinate(p1);
-           var n2 = new Coordinate(p2);
-           var n3 = new Coordinate(q1);
-           var n4 = new Coordinate(q2);
-           var normPt = new Coordinate();
-           this.normalizeToEnvCentre(n1, n2, n3, n4, normPt);
-           var intPt = this.safeHCoordinateIntersection(n1, n2, n3, n4);
-           intPt.x += normPt.x;
-           intPt.y += normPt.y;
-           return intPt
-         };
-         RobustLineIntersector.prototype.computeCollinearIntersection = function computeCollinearIntersection (p1, p2, q1, q2) {
-           var p1q1p2 = Envelope.intersects(p1, p2, q1);
-           var p1q2p2 = Envelope.intersects(p1, p2, q2);
-           var q1p1q2 = Envelope.intersects(q1, q2, p1);
-           var q1p2q2 = Envelope.intersects(q1, q2, p2);
-           if (p1q1p2 && p1q2p2) {
-             this._intPt[0] = q1;
-             this._intPt[1] = q2;
-             return LineIntersector$$1.COLLINEAR_INTERSECTION
-           }
-           if (q1p1q2 && q1p2q2) {
-             this._intPt[0] = p1;
-             this._intPt[1] = p2;
-             return LineIntersector$$1.COLLINEAR_INTERSECTION
-           }
-           if (p1q1p2 && q1p1q2) {
-             this._intPt[0] = q1;
-             this._intPt[1] = p1;
-             return q1.equals(p1) && !p1q2p2 && !q1p2q2 ? LineIntersector$$1.POINT_INTERSECTION : LineIntersector$$1.COLLINEAR_INTERSECTION
-           }
-           if (p1q1p2 && q1p2q2) {
-             this._intPt[0] = q1;
-             this._intPt[1] = p2;
-             return q1.equals(p2) && !p1q2p2 && !q1p1q2 ? LineIntersector$$1.POINT_INTERSECTION : LineIntersector$$1.COLLINEAR_INTERSECTION
-           }
-           if (p1q2p2 && q1p1q2) {
-             this._intPt[0] = q2;
-             this._intPt[1] = p1;
-             return q2.equals(p1) && !p1q1p2 && !q1p2q2 ? LineIntersector$$1.POINT_INTERSECTION : LineIntersector$$1.COLLINEAR_INTERSECTION
-           }
-           if (p1q2p2 && q1p2q2) {
-             this._intPt[0] = q2;
-             this._intPt[1] = p2;
-             return q2.equals(p2) && !p1q1p2 && !q1p1q2 ? LineIntersector$$1.POINT_INTERSECTION : LineIntersector$$1.COLLINEAR_INTERSECTION
-           }
-           return LineIntersector$$1.NO_INTERSECTION
-         };
-         RobustLineIntersector.prototype.normalizeToEnvCentre = function normalizeToEnvCentre (n00, n01, n10, n11, normPt) {
-           var minX0 = n00.x < n01.x ? n00.x : n01.x;
-           var minY0 = n00.y < n01.y ? n00.y : n01.y;
-           var maxX0 = n00.x > n01.x ? n00.x : n01.x;
-           var maxY0 = n00.y > n01.y ? n00.y : n01.y;
-           var minX1 = n10.x < n11.x ? n10.x : n11.x;
-           var minY1 = n10.y < n11.y ? n10.y : n11.y;
-           var maxX1 = n10.x > n11.x ? n10.x : n11.x;
-           var maxY1 = n10.y > n11.y ? n10.y : n11.y;
-           var intMinX = minX0 > minX1 ? minX0 : minX1;
-           var intMaxX = maxX0 < maxX1 ? maxX0 : maxX1;
-           var intMinY = minY0 > minY1 ? minY0 : minY1;
-           var intMaxY = maxY0 < maxY1 ? maxY0 : maxY1;
-           var intMidX = (intMinX + intMaxX) / 2.0;
-           var intMidY = (intMinY + intMaxY) / 2.0;
-           normPt.x = intMidX;
-           normPt.y = intMidY;
-           n00.x -= normPt.x;
-           n00.y -= normPt.y;
-           n01.x -= normPt.x;
-           n01.y -= normPt.y;
-           n10.x -= normPt.x;
-           n10.y -= normPt.y;
-           n11.x -= normPt.x;
-           n11.y -= normPt.y;
-         };
-         RobustLineIntersector.prototype.computeIntersect = function computeIntersect (p1, p2, q1, q2) {
-           this._isProper = false;
-           if (!Envelope.intersects(p1, p2, q1, q2)) { return LineIntersector$$1.NO_INTERSECTION }
-           var Pq1 = CGAlgorithms.orientationIndex(p1, p2, q1);
-           var Pq2 = CGAlgorithms.orientationIndex(p1, p2, q2);
-           if ((Pq1 > 0 && Pq2 > 0) || (Pq1 < 0 && Pq2 < 0)) {
-             return LineIntersector$$1.NO_INTERSECTION
-           }
-           var Qp1 = CGAlgorithms.orientationIndex(q1, q2, p1);
-           var Qp2 = CGAlgorithms.orientationIndex(q1, q2, p2);
-           if ((Qp1 > 0 && Qp2 > 0) || (Qp1 < 0 && Qp2 < 0)) {
-             return LineIntersector$$1.NO_INTERSECTION
-           }
-           var collinear = Pq1 === 0 && Pq2 === 0 && Qp1 === 0 && Qp2 === 0;
-           if (collinear) {
-             return this.computeCollinearIntersection(p1, p2, q1, q2)
-           }
-           if (Pq1 === 0 || Pq2 === 0 || Qp1 === 0 || Qp2 === 0) {
-             this._isProper = false;
-             if (p1.equals2D(q1) || p1.equals2D(q2)) {
-               this._intPt[0] = p1;
-             } else if (p2.equals2D(q1) || p2.equals2D(q2)) {
-               this._intPt[0] = p2;
-             } else if (Pq1 === 0) {
-               this._intPt[0] = new Coordinate(q1);
-             } else if (Pq2 === 0) {
-               this._intPt[0] = new Coordinate(q2);
-             } else if (Qp1 === 0) {
-               this._intPt[0] = new Coordinate(p1);
-             } else if (Qp2 === 0) {
-               this._intPt[0] = new Coordinate(p2);
+
+         maxspeed.tags = function (tags) {
+           _tags = tags;
+           var value = tags[field.key];
+           var isMixed = Array.isArray(value);
+
+           if (!isMixed) {
+             if (value && value.indexOf('mph') >= 0) {
+               value = parseInt(value, 10).toString();
+               _isImperial = true;
+             } else if (value) {
+               _isImperial = false;
              }
-           } else {
-             this._isProper = true;
-             this._intPt[0] = this.intersection(p1, p2, q1, q2);
            }
-           return LineIntersector$$1.POINT_INTERSECTION
-         };
-         RobustLineIntersector.prototype.interfaces_ = function interfaces_ () {
-           return []
+
+           setUnitSuggestions();
+           utilGetSetValue(input, typeof value === 'string' ? value : '').attr('title', isMixed ? value.filter(Boolean).join('\n') : null).attr('placeholder', isMixed ? _t('inspector.multiple_values') : field.placeholder()).classed('mixed', isMixed);
          };
-         RobustLineIntersector.prototype.getClass = function getClass () {
-           return RobustLineIntersector
+
+         maxspeed.focus = function () {
+           input.node().focus();
          };
-         RobustLineIntersector.nearestEndpoint = function nearestEndpoint (p1, p2, q1, q2) {
-           var nearestPt = p1;
-           var minDist = CGAlgorithms.distancePointLine(p1, q1, q2);
-           var dist = CGAlgorithms.distancePointLine(p2, q1, q2);
-           if (dist < minDist) {
-             minDist = dist;
-             nearestPt = p2;
-           }
-           dist = CGAlgorithms.distancePointLine(q1, p1, p2);
-           if (dist < minDist) {
-             minDist = dist;
-             nearestPt = q1;
-           }
-           dist = CGAlgorithms.distancePointLine(q2, p1, p2);
-           if (dist < minDist) {
-             minDist = dist;
-             nearestPt = q2;
-           }
-           return nearestPt
+
+         maxspeed.entityIDs = function (val) {
+           _entityIDs = val;
          };
 
-         return RobustLineIntersector;
-       }(LineIntersector));
+         function combinedEntityExtent() {
+           return _entityIDs && _entityIDs.length && utilTotalExtent(_entityIDs, context.graph());
+         }
 
-       var RobustDeterminant = function RobustDeterminant () {};
+         return utilRebind(maxspeed, dispatch$1, 'on');
+       }
 
-       RobustDeterminant.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       RobustDeterminant.prototype.getClass = function getClass () {
-         return RobustDeterminant
-       };
-       RobustDeterminant.orientationIndex = function orientationIndex (p1, p2, q) {
-         var dx1 = p2.x - p1.x;
-         var dy1 = p2.y - p1.y;
-         var dx2 = q.x - p2.x;
-         var dy2 = q.y - p2.y;
-         return RobustDeterminant.signOfDet2x2(dx1, dy1, dx2, dy2)
-       };
-       RobustDeterminant.signOfDet2x2 = function signOfDet2x2 (x1, y1, x2, y2) {
-         var sign = null;
-         var swap = null;
-         var k = null;
-         sign = 1;
-         if (x1 === 0.0 || y2 === 0.0) {
-           if (y1 === 0.0 || x2 === 0.0) {
-             return 0
-           } else if (y1 > 0) {
-             if (x2 > 0) {
-               return -sign
-             } else {
-               return sign
-             }
-           } else {
-             if (x2 > 0) {
-               return sign
-             } else {
-               return -sign
-             }
-           }
+       function uiFieldRadio(field, context) {
+         var dispatch$1 = dispatch('change');
+         var placeholder = select(null);
+         var wrap = select(null);
+         var labels = select(null);
+         var radios = select(null);
+         var radioData = (field.options || field.strings && field.strings.options && Object.keys(field.strings.options) || field.keys).slice(); // shallow copy
+
+         var typeField;
+         var layerField;
+         var _oldType = {};
+         var _entityIDs = [];
+
+         function selectedKey() {
+           var node = wrap.selectAll('.form-field-input-radio label.active input');
+           return !node.empty() && node.datum();
+         }
+
+         function radio(selection) {
+           selection.classed('preset-radio', true);
+           wrap = selection.selectAll('.form-field-input-wrap').data([0]);
+           var enter = wrap.enter().append('div').attr('class', 'form-field-input-wrap form-field-input-radio');
+           enter.append('span').attr('class', 'placeholder');
+           wrap = wrap.merge(enter);
+           placeholder = wrap.selectAll('.placeholder');
+           labels = wrap.selectAll('label').data(radioData);
+           enter = labels.enter().append('label');
+           enter.append('input').attr('type', 'radio').attr('name', field.id).attr('value', function (d) {
+             return field.t('options.' + d, {
+               'default': d
+             });
+           }).attr('checked', false);
+           enter.append('span').html(function (d) {
+             return field.t.html('options.' + d, {
+               'default': d
+             });
+           });
+           labels = labels.merge(enter);
+           radios = labels.selectAll('input').on('change', changeRadio);
          }
-         if (y1 === 0.0 || x2 === 0.0) {
-           if (y2 > 0) {
-             if (x1 > 0) {
-               return sign
-             } else {
-               return -sign
+
+         function structureExtras(selection, tags) {
+           var selected = selectedKey() || tags.layer !== undefined;
+           var type = _mainPresetIndex.field(selected);
+           var layer = _mainPresetIndex.field('layer');
+           var showLayer = selected === 'bridge' || selected === 'tunnel' || tags.layer !== undefined;
+           var extrasWrap = selection.selectAll('.structure-extras-wrap').data(selected ? [0] : []);
+           extrasWrap.exit().remove();
+           extrasWrap = extrasWrap.enter().append('div').attr('class', 'structure-extras-wrap').merge(extrasWrap);
+           var list = extrasWrap.selectAll('ul').data([0]);
+           list = list.enter().append('ul').attr('class', 'rows').merge(list); // Type
+
+           if (type) {
+             if (!typeField || typeField.id !== selected) {
+               typeField = uiField(context, type, _entityIDs, {
+                 wrap: false
+               }).on('change', changeType);
              }
+
+             typeField.tags(tags);
            } else {
-             if (x1 > 0) {
-               return -sign
-             } else {
-               return sign
-             }
+             typeField = null;
            }
-         }
-         if (y1 > 0.0) {
-           if (y2 > 0.0) {
-             if (y1 <= y2) ; else {
-               sign = -sign;
-               swap = x1;
-               x1 = x2;
-               x2 = swap;
-               swap = y1;
-               y1 = y2;
-               y2 = swap;
+
+           var typeItem = list.selectAll('.structure-type-item').data(typeField ? [typeField] : [], function (d) {
+             return d.id;
+           }); // Exit
+
+           typeItem.exit().remove(); // Enter
+
+           var typeEnter = typeItem.enter().insert('li', ':first-child').attr('class', 'labeled-input structure-type-item');
+           typeEnter.append('span').attr('class', 'label structure-label-type').attr('for', 'preset-input-' + selected).html(_t.html('inspector.radio.structure.type'));
+           typeEnter.append('div').attr('class', 'structure-input-type-wrap'); // Update
+
+           typeItem = typeItem.merge(typeEnter);
+
+           if (typeField) {
+             typeItem.selectAll('.structure-input-type-wrap').call(typeField.render);
+           } // Layer
+
+
+           if (layer && showLayer) {
+             if (!layerField) {
+               layerField = uiField(context, layer, _entityIDs, {
+                 wrap: false
+               }).on('change', changeLayer);
              }
+
+             layerField.tags(tags);
+             field.keys = utilArrayUnion(field.keys, ['layer']);
            } else {
-             if (y1 <= -y2) {
-               sign = -sign;
-               x2 = -x2;
-               y2 = -y2;
-             } else {
-               swap = x1;
-               x1 = -x2;
-               x2 = swap;
-               swap = y1;
-               y1 = -y2;
-               y2 = swap;
-             }
+             layerField = null;
+             field.keys = field.keys.filter(function (k) {
+               return k !== 'layer';
+             });
            }
-         } else {
-           if (y2 > 0.0) {
-             if (-y1 <= y2) {
-               sign = -sign;
-               x1 = -x1;
-               y1 = -y1;
-             } else {
-               swap = -x1;
-               x1 = x2;
-               x2 = swap;
-               swap = -y1;
-               y1 = y2;
-               y2 = swap;
-             }
-           } else {
-             if (y1 >= y2) {
-               x1 = -x1;
-               y1 = -y1;
-               x2 = -x2;
-               y2 = -y2;
-             } else {
-               sign = -sign;
-               swap = -x1;
-               x1 = -x2;
-               x2 = swap;
-               swap = -y1;
-               y1 = -y2;
-               y2 = swap;
-             }
+
+           var layerItem = list.selectAll('.structure-layer-item').data(layerField ? [layerField] : []); // Exit
+
+           layerItem.exit().remove(); // Enter
+
+           var layerEnter = layerItem.enter().append('li').attr('class', 'labeled-input structure-layer-item');
+           layerEnter.append('span').attr('class', 'label structure-label-layer').attr('for', 'preset-input-layer').html(_t.html('inspector.radio.structure.layer'));
+           layerEnter.append('div').attr('class', 'structure-input-layer-wrap'); // Update
+
+           layerItem = layerItem.merge(layerEnter);
+
+           if (layerField) {
+             layerItem.selectAll('.structure-input-layer-wrap').call(layerField.render);
            }
          }
-         if (x1 > 0.0) {
-           if (x2 > 0.0) {
-             if (x1 <= x2) ; else {
-               return sign
-             }
-           } else {
-             return sign
+
+         function changeType(t, onInput) {
+           var key = selectedKey();
+           if (!key) return;
+           var val = t[key];
+
+           if (val !== 'no') {
+             _oldType[key] = val;
            }
-         } else {
-           if (x2 > 0.0) {
-             return -sign
-           } else {
-             if (x1 >= x2) {
-               sign = -sign;
-               x1 = -x1;
-               x2 = -x2;
-             } else {
-               return -sign
+
+           if (field.type === 'structureRadio') {
+             // remove layer if it should not be set
+             if (val === 'no' || key !== 'bridge' && key !== 'tunnel' || key === 'tunnel' && val === 'building_passage') {
+               t.layer = undefined;
+             } // add layer if it should be set
+
+
+             if (t.layer === undefined) {
+               if (key === 'bridge' && val !== 'no') {
+                 t.layer = '1';
+               }
+
+               if (key === 'tunnel' && val !== 'no' && val !== 'building_passage') {
+                 t.layer = '-1';
+               }
              }
            }
+
+           dispatch$1.call('change', this, t, onInput);
          }
-         while (true) {
-           k = Math.floor(x2 / x1);
-           x2 = x2 - k * x1;
-           y2 = y2 - k * y1;
-           if (y2 < 0.0) {
-             return -sign
+
+         function changeLayer(t, onInput) {
+           if (t.layer === '0') {
+             t.layer = undefined;
            }
-           if (y2 > y1) {
-             return sign
+
+           dispatch$1.call('change', this, t, onInput);
+         }
+
+         function changeRadio() {
+           var t = {};
+           var activeKey;
+
+           if (field.key) {
+             t[field.key] = undefined;
            }
-           if (x1 > x2 + x2) {
-             if (y1 < y2 + y2) {
-               return sign
-             }
-           } else {
-             if (y1 > y2 + y2) {
-               return -sign
+
+           radios.each(function (d) {
+             var active = select(this).property('checked');
+             if (active) activeKey = d;
+
+             if (field.key) {
+               if (active) t[field.key] = d;
              } else {
-               x2 = x1 - x2;
-               y2 = y1 - y2;
-               sign = -sign;
+               var val = _oldType[activeKey] || 'yes';
+               t[d] = active ? val : undefined;
              }
-           }
-           if (y2 === 0.0) {
-             if (x2 === 0.0) {
-               return 0
+           });
+
+           if (field.type === 'structureRadio') {
+             if (activeKey === 'bridge') {
+               t.layer = '1';
+             } else if (activeKey === 'tunnel' && t.tunnel !== 'building_passage') {
+               t.layer = '-1';
              } else {
-               return -sign
+               t.layer = undefined;
              }
            }
-           if (x2 === 0.0) {
-             return sign
-           }
-           k = Math.floor(x1 / x2);
-           x1 = x1 - k * x2;
-           y1 = y1 - k * y2;
-           if (y1 < 0.0) {
-             return sign
-           }
-           if (y1 > y2) {
-             return -sign
-           }
-           if (x2 > x1 + x1) {
-             if (y2 < y1 + y1) {
-               return -sign
-             }
-           } else {
-             if (y2 > y1 + y1) {
-               return sign
-             } else {
-               x1 = x2 - x1;
-               y1 = y2 - y1;
-               sign = -sign;
+
+           dispatch$1.call('change', this, t);
+         }
+
+         radio.tags = function (tags) {
+           radios.property('checked', function (d) {
+             if (field.key) {
+               return tags[field.key] === d;
              }
-           }
-           if (y1 === 0.0) {
-             if (x1 === 0.0) {
-               return 0
-             } else {
-               return sign
+
+             return !!(typeof tags[d] === 'string' && tags[d].toLowerCase() !== 'no');
+           });
+
+           function isMixed(d) {
+             if (field.key) {
+               return Array.isArray(tags[field.key]) && tags[field.key].includes(d);
              }
-           }
-           if (x1 === 0.0) {
-             return -sign
-           }
-         }
-       };
 
-       var RayCrossingCounter = function RayCrossingCounter () {
-         this._p = null;
-         this._crossingCount = 0;
-         this._isPointOnSegment = false;
-         var p = arguments[0];
-         this._p = p;
-       };
-       RayCrossingCounter.prototype.countSegment = function countSegment (p1, p2) {
-         if (p1.x < this._p.x && p2.x < this._p.x) { return null }
-         if (this._p.x === p2.x && this._p.y === p2.y) {
-           this._isPointOnSegment = true;
-           return null
-         }
-         if (p1.y === this._p.y && p2.y === this._p.y) {
-           var minx = p1.x;
-           var maxx = p2.x;
-           if (minx > maxx) {
-             minx = p2.x;
-             maxx = p1.x;
-           }
-           if (this._p.x >= minx && this._p.x <= maxx) {
-             this._isPointOnSegment = true;
-           }
-           return null
-         }
-         if ((p1.y > this._p.y && p2.y <= this._p.y) || (p2.y > this._p.y && p1.y <= this._p.y)) {
-           var x1 = p1.x - this._p.x;
-           var y1 = p1.y - this._p.y;
-           var x2 = p2.x - this._p.x;
-           var y2 = p2.y - this._p.y;
-           var xIntSign = RobustDeterminant.signOfDet2x2(x1, y1, x2, y2);
-           if (xIntSign === 0.0) {
-             this._isPointOnSegment = true;
-             return null
-           }
-           if (y2 < y1) { xIntSign = -xIntSign; }
-           if (xIntSign > 0.0) {
-             this._crossingCount++;
+             return Array.isArray(tags[d]);
            }
-         }
-       };
-       RayCrossingCounter.prototype.isPointInPolygon = function isPointInPolygon () {
-         return this.getLocation() !== Location.EXTERIOR
-       };
-       RayCrossingCounter.prototype.getLocation = function getLocation () {
-         if (this._isPointOnSegment) { return Location.BOUNDARY }
-         if (this._crossingCount % 2 === 1) {
-           return Location.INTERIOR
-         }
-         return Location.EXTERIOR
-       };
-       RayCrossingCounter.prototype.isOnSegment = function isOnSegment () {
-         return this._isPointOnSegment
-       };
-       RayCrossingCounter.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       RayCrossingCounter.prototype.getClass = function getClass () {
-         return RayCrossingCounter
-       };
-       RayCrossingCounter.locatePointInRing = function locatePointInRing () {
-         if (arguments[0] instanceof Coordinate && hasInterface(arguments[1], CoordinateSequence)) {
-           var p = arguments[0];
-           var ring = arguments[1];
-           var counter = new RayCrossingCounter(p);
-           var p1 = new Coordinate();
-           var p2 = new Coordinate();
-           for (var i = 1; i < ring.size(); i++) {
-             ring.getCoordinate(i, p1);
-             ring.getCoordinate(i - 1, p2);
-             counter.countSegment(p1, p2);
-             if (counter.isOnSegment()) { return counter.getLocation() }
-           }
-           return counter.getLocation()
-         } else if (arguments[0] instanceof Coordinate && arguments[1] instanceof Array) {
-           var p$1 = arguments[0];
-           var ring$1 = arguments[1];
-           var counter$1 = new RayCrossingCounter(p$1);
-           for (var i$1 = 1; i$1 < ring$1.length; i$1++) {
-             var p1$1 = ring$1[i$1];
-             var p2$1 = ring$1[i$1 - 1];
-             counter$1.countSegment(p1$1, p2$1);
-             if (counter$1.isOnSegment()) { return counter$1.getLocation() }
-           }
-           return counter$1.getLocation()
-         }
-       };
 
-       var CGAlgorithms = function CGAlgorithms () {};
+           labels.classed('active', function (d) {
+             if (field.key) {
+               return Array.isArray(tags[field.key]) && tags[field.key].includes(d) || tags[field.key] === d;
+             }
 
-       var staticAccessors$3 = { CLOCKWISE: { configurable: true },RIGHT: { configurable: true },COUNTERCLOCKWISE: { configurable: true },LEFT: { configurable: true },COLLINEAR: { configurable: true },STRAIGHT: { configurable: true } };
+             return Array.isArray(tags[d]) || !!(tags[d] && tags[d].toLowerCase() !== 'no');
+           }).classed('mixed', isMixed).attr('title', function (d) {
+             return isMixed(d) ? _t('inspector.unshared_value_tooltip') : null;
+           });
+           var selection = radios.filter(function () {
+             return this.checked;
+           });
 
-       CGAlgorithms.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       CGAlgorithms.prototype.getClass = function getClass () {
-         return CGAlgorithms
-       };
-       CGAlgorithms.orientationIndex = function orientationIndex (p1, p2, q) {
-         return CGAlgorithmsDD.orientationIndex(p1, p2, q)
-       };
-       CGAlgorithms.signedArea = function signedArea () {
-         if (arguments[0] instanceof Array) {
-           var ring = arguments[0];
-           if (ring.length < 3) { return 0.0 }
-           var sum = 0.0;
-           var x0 = ring[0].x;
-           for (var i = 1; i < ring.length - 1; i++) {
-             var x = ring[i].x - x0;
-             var y1 = ring[i + 1].y;
-             var y2 = ring[i - 1].y;
-             sum += x * (y2 - y1);
-           }
-           return sum / 2.0
-         } else if (hasInterface(arguments[0], CoordinateSequence)) {
-           var ring$1 = arguments[0];
-           var n = ring$1.size();
-           if (n < 3) { return 0.0 }
-           var p0 = new Coordinate();
-           var p1 = new Coordinate();
-           var p2 = new Coordinate();
-           ring$1.getCoordinate(0, p1);
-           ring$1.getCoordinate(1, p2);
-           var x0$1 = p1.x;
-           p2.x -= x0$1;
-           var sum$1 = 0.0;
-           for (var i$1 = 1; i$1 < n - 1; i$1++) {
-             p0.y = p1.y;
-             p1.x = p2.x;
-             p1.y = p2.y;
-             ring$1.getCoordinate(i$1 + 1, p2);
-             p2.x -= x0$1;
-             sum$1 += p1.x * (p0.y - p2.y);
-           }
-           return sum$1 / 2.0
-         }
-       };
-       CGAlgorithms.distanceLineLine = function distanceLineLine (A, B, C, D) {
-         if (A.equals(B)) { return CGAlgorithms.distancePointLine(A, C, D) }
-         if (C.equals(D)) { return CGAlgorithms.distancePointLine(D, A, B) }
-         var noIntersection = false;
-         if (!Envelope.intersects(A, B, C, D)) {
-           noIntersection = true;
-         } else {
-           var denom = (B.x - A.x) * (D.y - C.y) - (B.y - A.y) * (D.x - C.x);
-           if (denom === 0) {
-             noIntersection = true;
+           if (selection.empty()) {
+             placeholder.html(_t.html('inspector.none'));
            } else {
-             var rNumb = (A.y - C.y) * (D.x - C.x) - (A.x - C.x) * (D.y - C.y);
-             var sNum = (A.y - C.y) * (B.x - A.x) - (A.x - C.x) * (B.y - A.y);
-             var s = sNum / denom;
-             var r = rNumb / denom;
-             if (r < 0 || r > 1 || s < 0 || s > 1) {
-               noIntersection = true;
-             }
+             placeholder.html(selection.attr('value'));
+             _oldType[selection.datum()] = tags[selection.datum()];
            }
-         }
-         if (noIntersection) {
-           return MathUtil.min(CGAlgorithms.distancePointLine(A, C, D), CGAlgorithms.distancePointLine(B, C, D), CGAlgorithms.distancePointLine(C, A, B), CGAlgorithms.distancePointLine(D, A, B))
-         }
-         return 0.0
-       };
-       CGAlgorithms.isPointInRing = function isPointInRing (p, ring) {
-         return CGAlgorithms.locatePointInRing(p, ring) !== Location.EXTERIOR
-       };
-       CGAlgorithms.computeLength = function computeLength (pts) {
-         var n = pts.size();
-         if (n <= 1) { return 0.0 }
-         var len = 0.0;
-         var p = new Coordinate();
-         pts.getCoordinate(0, p);
-         var x0 = p.x;
-         var y0 = p.y;
-         for (var i = 1; i < n; i++) {
-           pts.getCoordinate(i, p);
-           var x1 = p.x;
-           var y1 = p.y;
-           var dx = x1 - x0;
-           var dy = y1 - y0;
-           len += Math.sqrt(dx * dx + dy * dy);
-           x0 = x1;
-           y0 = y1;
-         }
-         return len
-       };
-       CGAlgorithms.isCCW = function isCCW (ring) {
-         var nPts = ring.length - 1;
-         if (nPts < 3) { throw new IllegalArgumentException('Ring has fewer than 4 points, so orientation cannot be determined') }
-         var hiPt = ring[0];
-         var hiIndex = 0;
-         for (var i = 1; i <= nPts; i++) {
-           var p = ring[i];
-           if (p.y > hiPt.y) {
-             hiPt = p;
-             hiIndex = i;
-           }
-         }
-         var iPrev = hiIndex;
-         do {
-           iPrev = iPrev - 1;
-           if (iPrev < 0) { iPrev = nPts; }
-         } while (ring[iPrev].equals2D(hiPt) && iPrev !== hiIndex)
-         var iNext = hiIndex;
-         do {
-           iNext = (iNext + 1) % nPts;
-         } while (ring[iNext].equals2D(hiPt) && iNext !== hiIndex)
-         var prev = ring[iPrev];
-         var next = ring[iNext];
-         if (prev.equals2D(hiPt) || next.equals2D(hiPt) || prev.equals2D(next)) { return false }
-         var disc = CGAlgorithms.computeOrientation(prev, hiPt, next);
-         var isCCW = false;
-         if (disc === 0) {
-           isCCW = prev.x > next.x;
-         } else {
-           isCCW = disc > 0;
-         }
-         return isCCW
-       };
-       CGAlgorithms.locatePointInRing = function locatePointInRing (p, ring) {
-         return RayCrossingCounter.locatePointInRing(p, ring)
-       };
-       CGAlgorithms.distancePointLinePerpendicular = function distancePointLinePerpendicular (p, A, B) {
-         var len2 = (B.x - A.x) * (B.x - A.x) + (B.y - A.y) * (B.y - A.y);
-         var s = ((A.y - p.y) * (B.x - A.x) - (A.x - p.x) * (B.y - A.y)) / len2;
-         return Math.abs(s) * Math.sqrt(len2)
-       };
-       CGAlgorithms.computeOrientation = function computeOrientation (p1, p2, q) {
-         return CGAlgorithms.orientationIndex(p1, p2, q)
-       };
-       CGAlgorithms.distancePointLine = function distancePointLine () {
-         if (arguments.length === 2) {
-           var p = arguments[0];
-           var line = arguments[1];
-           if (line.length === 0) { throw new IllegalArgumentException('Line array must contain at least one vertex') }
-           var minDistance = p.distance(line[0]);
-           for (var i = 0; i < line.length - 1; i++) {
-             var dist = CGAlgorithms.distancePointLine(p, line[i], line[i + 1]);
-             if (dist < minDistance) {
-               minDistance = dist;
-             }
-           }
-           return minDistance
-         } else if (arguments.length === 3) {
-           var p$1 = arguments[0];
-           var A = arguments[1];
-           var B = arguments[2];
-           if (A.x === B.x && A.y === B.y) { return p$1.distance(A) }
-           var len2 = (B.x - A.x) * (B.x - A.x) + (B.y - A.y) * (B.y - A.y);
-           var r = ((p$1.x - A.x) * (B.x - A.x) + (p$1.y - A.y) * (B.y - A.y)) / len2;
-           if (r <= 0.0) { return p$1.distance(A) }
-           if (r >= 1.0) { return p$1.distance(B) }
-           var s = ((A.y - p$1.y) * (B.x - A.x) - (A.x - p$1.x) * (B.y - A.y)) / len2;
-           return Math.abs(s) * Math.sqrt(len2)
-         }
-       };
-       CGAlgorithms.isOnLine = function isOnLine (p, pt) {
-         var lineIntersector = new RobustLineIntersector();
-         for (var i = 1; i < pt.length; i++) {
-           var p0 = pt[i - 1];
-           var p1 = pt[i];
-           lineIntersector.computeIntersection(p, p0, p1);
-           if (lineIntersector.hasIntersection()) {
-             return true
+
+           if (field.type === 'structureRadio') {
+             // For waterways without a tunnel tag, set 'culvert' as
+             // the _oldType to default to if the user picks 'tunnel'
+             if (!!tags.waterway && !_oldType.tunnel) {
+               _oldType.tunnel = 'culvert';
+             }
+
+             wrap.call(structureExtras, tags);
            }
-         }
-         return false
-       };
-       staticAccessors$3.CLOCKWISE.get = function () { return -1 };
-       staticAccessors$3.RIGHT.get = function () { return CGAlgorithms.CLOCKWISE };
-       staticAccessors$3.COUNTERCLOCKWISE.get = function () { return 1 };
-       staticAccessors$3.LEFT.get = function () { return CGAlgorithms.COUNTERCLOCKWISE };
-       staticAccessors$3.COLLINEAR.get = function () { return 0 };
-       staticAccessors$3.STRAIGHT.get = function () { return CGAlgorithms.COLLINEAR };
+         };
 
-       Object.defineProperties( CGAlgorithms, staticAccessors$3 );
+         radio.focus = function () {
+           radios.node().focus();
+         };
 
-       var GeometryComponentFilter = function GeometryComponentFilter () {};
+         radio.entityIDs = function (val) {
+           if (!arguments.length) return _entityIDs;
+           _entityIDs = val;
+           _oldType = {};
+           return radio;
+         };
 
-       GeometryComponentFilter.prototype.filter = function filter (geom) {};
-       GeometryComponentFilter.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       GeometryComponentFilter.prototype.getClass = function getClass () {
-         return GeometryComponentFilter
-       };
+         radio.isAllowed = function () {
+           return _entityIDs.length === 1;
+         };
 
-       var Geometry = function Geometry () {
-         var factory = arguments[0];
+         return utilRebind(radio, dispatch$1, 'on');
+       }
 
-         this._envelope = null;
-         this._factory = null;
-         this._SRID = null;
-         this._userData = null;
-         this._factory = factory;
-         this._SRID = factory.getSRID();
-       };
+       function uiFieldRestrictions(field, context) {
+         var dispatch$1 = dispatch('change');
+         var breathe = behaviorBreathe();
+         corePreferences('turn-restriction-via-way', null); // remove old key
 
-       var staticAccessors$11 = { serialVersionUID: { configurable: true },SORTINDEX_POINT: { configurable: true },SORTINDEX_MULTIPOINT: { configurable: true },SORTINDEX_LINESTRING: { configurable: true },SORTINDEX_LINEARRING: { configurable: true },SORTINDEX_MULTILINESTRING: { configurable: true },SORTINDEX_POLYGON: { configurable: true },SORTINDEX_MULTIPOLYGON: { configurable: true },SORTINDEX_GEOMETRYCOLLECTION: { configurable: true },geometryChangedFilter: { configurable: true } };
-       Geometry.prototype.isGeometryCollection = function isGeometryCollection () {
-         return this.getSortIndex() === Geometry.SORTINDEX_GEOMETRYCOLLECTION
-       };
-       Geometry.prototype.getFactory = function getFactory () {
-         return this._factory
-       };
-       Geometry.prototype.getGeometryN = function getGeometryN (n) {
-         return this
-       };
-       Geometry.prototype.getArea = function getArea () {
-         return 0.0
-       };
-       Geometry.prototype.isRectangle = function isRectangle () {
-         return false
-       };
-       Geometry.prototype.equals = function equals () {
-         if (arguments[0] instanceof Geometry) {
-           var g$1 = arguments[0];
-           if (g$1 === null) { return false }
-           return this.equalsTopo(g$1)
-         } else if (arguments[0] instanceof Object) {
-           var o = arguments[0];
-           if (!(o instanceof Geometry)) { return false }
-           var g = o;
-           return this.equalsExact(g)
-         }
-       };
-       Geometry.prototype.equalsExact = function equalsExact (other) {
-         return this === other || this.equalsExact(other, 0)
-       };
-       Geometry.prototype.geometryChanged = function geometryChanged () {
-         this.apply(Geometry.geometryChangedFilter);
-       };
-       Geometry.prototype.geometryChangedAction = function geometryChangedAction () {
-         this._envelope = null;
-       };
-       Geometry.prototype.equalsNorm = function equalsNorm (g) {
-         if (g === null) { return false }
-         return this.norm().equalsExact(g.norm())
-       };
-       Geometry.prototype.getLength = function getLength () {
-         return 0.0
-       };
-       Geometry.prototype.getNumGeometries = function getNumGeometries () {
-         return 1
-       };
-       Geometry.prototype.compareTo = function compareTo () {
-         if (arguments.length === 1) {
-           var o = arguments[0];
-           var other = o;
-           if (this.getSortIndex() !== other.getSortIndex()) {
-             return this.getSortIndex() - other.getSortIndex()
-           }
-           if (this.isEmpty() && other.isEmpty()) {
-             return 0
-           }
-           if (this.isEmpty()) {
-             return -1
-           }
-           if (other.isEmpty()) {
-             return 1
-           }
-           return this.compareToSameClass(o)
-         } else if (arguments.length === 2) {
-           var other$1 = arguments[0];
-           var comp = arguments[1];
-           if (this.getSortIndex() !== other$1.getSortIndex()) {
-             return this.getSortIndex() - other$1.getSortIndex()
-           }
-           if (this.isEmpty() && other$1.isEmpty()) {
-             return 0
-           }
-           if (this.isEmpty()) {
-             return -1
-           }
-           if (other$1.isEmpty()) {
-             return 1
-           }
-           return this.compareToSameClass(other$1, comp)
-         }
-       };
-       Geometry.prototype.getUserData = function getUserData () {
-         return this._userData
-       };
-       Geometry.prototype.getSRID = function getSRID () {
-         return this._SRID
-       };
-       Geometry.prototype.getEnvelope = function getEnvelope () {
-         return this.getFactory().toGeometry(this.getEnvelopeInternal())
-       };
-       Geometry.prototype.checkNotGeometryCollection = function checkNotGeometryCollection (g) {
-         if (g.getSortIndex() === Geometry.SORTINDEX_GEOMETRYCOLLECTION) {
-           throw new IllegalArgumentException('This method does not support GeometryCollection arguments')
-         }
-       };
-       Geometry.prototype.equal = function equal (a, b, tolerance) {
-         if (tolerance === 0) {
-           return a.equals(b)
-         }
-         return a.distance(b) <= tolerance
-       };
-       Geometry.prototype.norm = function norm () {
-         var copy = this.copy();
-         copy.normalize();
-         return copy
-       };
-       Geometry.prototype.getPrecisionModel = function getPrecisionModel () {
-         return this._factory.getPrecisionModel()
-       };
-       Geometry.prototype.getEnvelopeInternal = function getEnvelopeInternal () {
-         if (this._envelope === null) {
-           this._envelope = this.computeEnvelopeInternal();
-         }
-         return new Envelope(this._envelope)
-       };
-       Geometry.prototype.setSRID = function setSRID (SRID) {
-         this._SRID = SRID;
-       };
-       Geometry.prototype.setUserData = function setUserData (userData) {
-         this._userData = userData;
-       };
-       Geometry.prototype.compare = function compare (a, b) {
-         var i = a.iterator();
-         var j = b.iterator();
-         while (i.hasNext() && j.hasNext()) {
-           var aElement = i.next();
-           var bElement = j.next();
-           var comparison = aElement.compareTo(bElement);
-           if (comparison !== 0) {
-             return comparison
-           }
-         }
-         if (i.hasNext()) {
-           return 1
-         }
-         if (j.hasNext()) {
-           return -1
-         }
-         return 0
-       };
-       Geometry.prototype.hashCode = function hashCode () {
-         return this.getEnvelopeInternal().hashCode()
-       };
-       Geometry.prototype.isGeometryCollectionOrDerived = function isGeometryCollectionOrDerived () {
-         if (this.getSortIndex() === Geometry.SORTINDEX_GEOMETRYCOLLECTION || this.getSortIndex() === Geometry.SORTINDEX_MULTIPOINT || this.getSortIndex() === Geometry.SORTINDEX_MULTILINESTRING || this.getSortIndex() === Geometry.SORTINDEX_MULTIPOLYGON) {
-           return true
-         }
-         return false
-       };
-       Geometry.prototype.interfaces_ = function interfaces_ () {
-         return [Clonable, Comparable, Serializable]
-       };
-       Geometry.prototype.getClass = function getClass () {
-         return Geometry
-       };
-       Geometry.hasNonEmptyElements = function hasNonEmptyElements (geometries) {
-         for (var i = 0; i < geometries.length; i++) {
-           if (!geometries[i].isEmpty()) {
-             return true
-           }
-         }
-         return false
-       };
-       Geometry.hasNullElements = function hasNullElements (array) {
-         for (var i = 0; i < array.length; i++) {
-           if (array[i] === null) {
-             return true
-           }
-         }
-         return false
-       };
-       staticAccessors$11.serialVersionUID.get = function () { return 8763622679187376702 };
-       staticAccessors$11.SORTINDEX_POINT.get = function () { return 0 };
-       staticAccessors$11.SORTINDEX_MULTIPOINT.get = function () { return 1 };
-       staticAccessors$11.SORTINDEX_LINESTRING.get = function () { return 2 };
-       staticAccessors$11.SORTINDEX_LINEARRING.get = function () { return 3 };
-       staticAccessors$11.SORTINDEX_MULTILINESTRING.get = function () { return 4 };
-       staticAccessors$11.SORTINDEX_POLYGON.get = function () { return 5 };
-       staticAccessors$11.SORTINDEX_MULTIPOLYGON.get = function () { return 6 };
-       staticAccessors$11.SORTINDEX_GEOMETRYCOLLECTION.get = function () { return 7 };
-       staticAccessors$11.geometryChangedFilter.get = function () { return geometryChangedFilter };
-
-       Object.defineProperties( Geometry, staticAccessors$11 );
-
-       var geometryChangedFilter = function geometryChangedFilter () {};
-
-       geometryChangedFilter.interfaces_ = function interfaces_ () {
-         return [GeometryComponentFilter]
-       };
-       geometryChangedFilter.filter = function filter (geom) {
-         geom.geometryChangedAction();
-       };
+         var storedViaWay = corePreferences('turn-restriction-via-way0'); // use new key #6922
 
-       var CoordinateFilter = function CoordinateFilter () {};
+         var storedDistance = corePreferences('turn-restriction-distance');
 
-       CoordinateFilter.prototype.filter = function filter (coord) {};
-       CoordinateFilter.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       CoordinateFilter.prototype.getClass = function getClass () {
-         return CoordinateFilter
-       };
+         var _maxViaWay = storedViaWay !== null ? +storedViaWay : 0;
 
-       var BoundaryNodeRule = function BoundaryNodeRule () {};
+         var _maxDistance = storedDistance ? +storedDistance : 30;
 
-       var staticAccessors$12 = { Mod2BoundaryNodeRule: { configurable: true },EndPointBoundaryNodeRule: { configurable: true },MultiValentEndPointBoundaryNodeRule: { configurable: true },MonoValentEndPointBoundaryNodeRule: { configurable: true },MOD2_BOUNDARY_RULE: { configurable: true },ENDPOINT_BOUNDARY_RULE: { configurable: true },MULTIVALENT_ENDPOINT_BOUNDARY_RULE: { configurable: true },MONOVALENT_ENDPOINT_BOUNDARY_RULE: { configurable: true },OGC_SFS_BOUNDARY_RULE: { configurable: true } };
+         var _initialized = false;
 
-       BoundaryNodeRule.prototype.isInBoundary = function isInBoundary (boundaryCount) {};
-       BoundaryNodeRule.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       BoundaryNodeRule.prototype.getClass = function getClass () {
-         return BoundaryNodeRule
-       };
-       staticAccessors$12.Mod2BoundaryNodeRule.get = function () { return Mod2BoundaryNodeRule };
-       staticAccessors$12.EndPointBoundaryNodeRule.get = function () { return EndPointBoundaryNodeRule };
-       staticAccessors$12.MultiValentEndPointBoundaryNodeRule.get = function () { return MultiValentEndPointBoundaryNodeRule };
-       staticAccessors$12.MonoValentEndPointBoundaryNodeRule.get = function () { return MonoValentEndPointBoundaryNodeRule };
-       staticAccessors$12.MOD2_BOUNDARY_RULE.get = function () { return new Mod2BoundaryNodeRule() };
-       staticAccessors$12.ENDPOINT_BOUNDARY_RULE.get = function () { return new EndPointBoundaryNodeRule() };
-       staticAccessors$12.MULTIVALENT_ENDPOINT_BOUNDARY_RULE.get = function () { return new MultiValentEndPointBoundaryNodeRule() };
-       staticAccessors$12.MONOVALENT_ENDPOINT_BOUNDARY_RULE.get = function () { return new MonoValentEndPointBoundaryNodeRule() };
-       staticAccessors$12.OGC_SFS_BOUNDARY_RULE.get = function () { return BoundaryNodeRule.MOD2_BOUNDARY_RULE };
-
-       Object.defineProperties( BoundaryNodeRule, staticAccessors$12 );
-
-       var Mod2BoundaryNodeRule = function Mod2BoundaryNodeRule () {};
-
-       Mod2BoundaryNodeRule.prototype.isInBoundary = function isInBoundary (boundaryCount) {
-         return boundaryCount % 2 === 1
-       };
-       Mod2BoundaryNodeRule.prototype.interfaces_ = function interfaces_ () {
-         return [BoundaryNodeRule]
-       };
-       Mod2BoundaryNodeRule.prototype.getClass = function getClass () {
-         return Mod2BoundaryNodeRule
-       };
+         var _parent = select(null); // the entire field
 
-       var EndPointBoundaryNodeRule = function EndPointBoundaryNodeRule () {};
 
-       EndPointBoundaryNodeRule.prototype.isInBoundary = function isInBoundary (boundaryCount) {
-         return boundaryCount > 0
-       };
-       EndPointBoundaryNodeRule.prototype.interfaces_ = function interfaces_ () {
-         return [BoundaryNodeRule]
-       };
-       EndPointBoundaryNodeRule.prototype.getClass = function getClass () {
-         return EndPointBoundaryNodeRule
-       };
+         var _container = select(null); // just the map
 
-       var MultiValentEndPointBoundaryNodeRule = function MultiValentEndPointBoundaryNodeRule () {};
 
-       MultiValentEndPointBoundaryNodeRule.prototype.isInBoundary = function isInBoundary (boundaryCount) {
-         return boundaryCount > 1
-       };
-       MultiValentEndPointBoundaryNodeRule.prototype.interfaces_ = function interfaces_ () {
-         return [BoundaryNodeRule]
-       };
-       MultiValentEndPointBoundaryNodeRule.prototype.getClass = function getClass () {
-         return MultiValentEndPointBoundaryNodeRule
-       };
+         var _oldTurns;
 
-       var MonoValentEndPointBoundaryNodeRule = function MonoValentEndPointBoundaryNodeRule () {};
+         var _graph;
 
-       MonoValentEndPointBoundaryNodeRule.prototype.isInBoundary = function isInBoundary (boundaryCount) {
-         return boundaryCount === 1
-       };
-       MonoValentEndPointBoundaryNodeRule.prototype.interfaces_ = function interfaces_ () {
-         return [BoundaryNodeRule]
-       };
-       MonoValentEndPointBoundaryNodeRule.prototype.getClass = function getClass () {
-         return MonoValentEndPointBoundaryNodeRule
-       };
+         var _vertexID;
 
-       // import Iterator from './Iterator'
+         var _intersection;
 
-       /**
-        * @see http://download.oracle.com/javase/6/docs/api/java/util/Collection.html
-        *
-        * @constructor
-        * @private
-        */
-       var Collection = function Collection () {};
+         var _fromWayID;
 
-       Collection.prototype.add = function add () {};
+         var _lastXPos;
 
-       /**
-        * Appends all of the elements in the specified collection to the end of this
-        * list, in the order that they are returned by the specified collection's
-        * iterator (optional operation).
-        * @param {javascript.util.Collection} c
-        * @return {boolean}
-        */
-       Collection.prototype.addAll = function addAll () {};
+         function restrictions(selection) {
+           _parent = selection; // try to reuse the intersection, but always rebuild it if the graph has changed
 
-       /**
-        * Returns true if this collection contains no elements.
-        * @return {boolean}
-        */
-       Collection.prototype.isEmpty = function isEmpty () {};
+           if (_vertexID && (context.graph() !== _graph || !_intersection)) {
+             _graph = context.graph();
+             _intersection = osmIntersection(_graph, _vertexID, _maxDistance);
+           } // It's possible for there to be no actual intersection here.
+           // for example, a vertex of two `highway=path`
+           // In this case, hide the field.
 
-       /**
-        * Returns an iterator over the elements in this collection.
-        * @return {javascript.util.Iterator}
-        */
-       Collection.prototype.iterator = function iterator () {};
 
-       /**
-        * Returns an iterator over the elements in this collection.
-        * @return {number}
-        */
-       Collection.prototype.size = function size () {};
+           var isOK = _intersection && _intersection.vertices.length && // has vertices
+           _intersection.vertices // has the vertex that the user selected
+           .filter(function (vertex) {
+             return vertex.id === _vertexID;
+           }).length && _intersection.ways.length > 2 && // has more than 2 ways
+           _intersection.ways // has more than 1 TO way
+           .filter(function (way) {
+             return way.__to;
+           }).length > 1; // Also hide in the case where
 
-       /**
-        * Returns an array containing all of the elements in this collection.
-        * @return {Array}
-        */
-       Collection.prototype.toArray = function toArray () {};
+           select(selection.node().parentNode).classed('hide', !isOK); // if form field is hidden or has detached from dom, clean up.
 
-       /**
-        * Removes a single instance of the specified element from this collection if it
-        * is present. (optional)
-        * @param {Object} e
-        * @return {boolean}
-        */
-       Collection.prototype.remove = function remove () {};
+           if (!isOK || !context.container().select('.inspector-wrap.inspector-hidden').empty() || !selection.node().parentNode || !selection.node().parentNode.parentNode) {
+             selection.call(restrictions.off);
+             return;
+           }
 
-       /**
-        * @param {string=} message Optional message
-        * @extends {Error}
-        * @constructor
-        * @private
-        */
-       function IndexOutOfBoundsException (message) {
-         this.message = message || '';
-       }
-       IndexOutOfBoundsException.prototype = new Error();
+           var wrap = selection.selectAll('.form-field-input-wrap').data([0]);
+           wrap = wrap.enter().append('div').attr('class', 'form-field-input-wrap form-field-input-' + field.type).merge(wrap);
+           var container = wrap.selectAll('.restriction-container').data([0]); // enter
 
-       /**
-        * @type {string}
-        */
-       IndexOutOfBoundsException.prototype.name = 'IndexOutOfBoundsException';
+           var containerEnter = container.enter().append('div').attr('class', 'restriction-container');
+           containerEnter.append('div').attr('class', 'restriction-help'); // update
 
-       /**
-        * @see http://download.oracle.com/javase/6/docs/api/java/util/Iterator.html
-        * @constructor
-        * @private
-        */
-       var Iterator$1 = function Iterator () {};
+           _container = containerEnter.merge(container).call(renderViewer);
+           var controls = wrap.selectAll('.restriction-controls').data([0]); // enter/update
 
-       Iterator$1.prototype.hasNext = function hasNext () {};
+           controls.enter().append('div').attr('class', 'restriction-controls-container').append('div').attr('class', 'restriction-controls').merge(controls).call(renderControls);
+         }
 
-       /**
-        * Returns the next element in the iteration.
-        * @return {Object}
-        */
-       Iterator$1.prototype.next = function next () {};
+         function renderControls(selection) {
+           var distControl = selection.selectAll('.restriction-distance').data([0]);
+           distControl.exit().remove();
+           var distControlEnter = distControl.enter().append('div').attr('class', 'restriction-control restriction-distance');
+           distControlEnter.append('span').attr('class', 'restriction-control-label restriction-distance-label').html(_t.html('restriction.controls.distance') + ':');
+           distControlEnter.append('input').attr('class', 'restriction-distance-input').attr('type', 'range').attr('min', '20').attr('max', '50').attr('step', '5');
+           distControlEnter.append('span').attr('class', 'restriction-distance-text'); // update
 
-       /**
-        * Removes from the underlying collection the last element returned by the
-        * iterator (optional operation).
-        */
-       Iterator$1.prototype.remove = function remove () {};
+           selection.selectAll('.restriction-distance-input').property('value', _maxDistance).on('input', function () {
+             var val = select(this).property('value');
+             _maxDistance = +val;
+             _intersection = null;
 
-       /**
-        * @see http://download.oracle.com/javase/6/docs/api/java/util/List.html
-        *
-        * @extends {javascript.util.Collection}
-        * @constructor
-        * @private
-        */
-       var List = (function (Collection$$1) {
-         function List () {
-           Collection$$1.apply(this, arguments);
-         }
+             _container.selectAll('.layer-osm .layer-turns *').remove();
 
-         if ( Collection$$1 ) List.__proto__ = Collection$$1;
-         List.prototype = Object.create( Collection$$1 && Collection$$1.prototype );
-         List.prototype.constructor = List;
+             corePreferences('turn-restriction-distance', _maxDistance);
 
-         List.prototype.get = function get () { };
+             _parent.call(restrictions);
+           });
+           selection.selectAll('.restriction-distance-text').html(displayMaxDistance(_maxDistance));
+           var viaControl = selection.selectAll('.restriction-via-way').data([0]);
+           viaControl.exit().remove();
+           var viaControlEnter = viaControl.enter().append('div').attr('class', 'restriction-control restriction-via-way');
+           viaControlEnter.append('span').attr('class', 'restriction-control-label restriction-via-way-label').html(_t.html('restriction.controls.via') + ':');
+           viaControlEnter.append('input').attr('class', 'restriction-via-way-input').attr('type', 'range').attr('min', '0').attr('max', '2').attr('step', '1');
+           viaControlEnter.append('span').attr('class', 'restriction-via-way-text'); // update
 
-         /**
-          * Replaces the element at the specified position in this list with the
-          * specified element (optional operation).
-          * @param {number} index
-          * @param {Object} e
-          * @return {Object}
-          */
-         List.prototype.set = function set () { };
+           selection.selectAll('.restriction-via-way-input').property('value', _maxViaWay).on('input', function () {
+             var val = select(this).property('value');
+             _maxViaWay = +val;
 
-         /**
-          * Returns true if this collection contains no elements.
-          * @return {boolean}
-          */
-         List.prototype.isEmpty = function isEmpty () { };
+             _container.selectAll('.layer-osm .layer-turns *').remove();
 
-         return List;
-       }(Collection));
+             corePreferences('turn-restriction-via-way0', _maxViaWay);
 
-       /**
-        * @param {string=} message Optional message
-        * @extends {Error}
-        * @constructor
-        * @private
-        */
-       function NoSuchElementException (message) {
-         this.message = message || '';
-       }
-       NoSuchElementException.prototype = new Error();
+             _parent.call(restrictions);
+           });
+           selection.selectAll('.restriction-via-way-text').html(displayMaxVia(_maxViaWay));
+         }
+
+         function renderViewer(selection) {
+           if (!_intersection) return;
+           var vgraph = _intersection.graph;
+           var filter = utilFunctor(true);
+           var projection = geoRawMercator(); // Reflow warning: `utilGetDimensions` calls `getBoundingClientRect`
+           // Instead of asking the restriction-container for its dimensions,
+           //  we can ask the .sidebar, which can have its dimensions cached.
+           // width: calc as sidebar - padding
+           // height: hardcoded (from `80_app.css`)
+           // var d = utilGetDimensions(selection);
+
+           var sdims = utilGetDimensions(context.container().select('.sidebar'));
+           var d = [sdims[0] - 50, 370];
+           var c = geoVecScale(d, 0.5);
+           var z = 22;
+           projection.scale(geoZoomToScale(z)); // Calculate extent of all key vertices
 
-       /**
-        * @type {string}
-        */
-       NoSuchElementException.prototype.name = 'NoSuchElementException';
+           var extent = geoExtent();
 
-       // import OperationNotSupported from './OperationNotSupported'
+           for (var i = 0; i < _intersection.vertices.length; i++) {
+             extent._extend(_intersection.vertices[i].extent());
+           } // If this is a large intersection, adjust zoom to fit extent
 
-       /**
-        * @see http://download.oracle.com/javase/6/docs/api/java/util/ArrayList.html
-        *
-        * @extends List
-        * @private
-        */
-       var ArrayList = (function (List$$1) {
-         function ArrayList () {
-           List$$1.call(this);
-           this.array_ = [];
 
-           if (arguments[0] instanceof Collection) {
-             this.addAll(arguments[0]);
-           }
-         }
+           if (_intersection.vertices.length > 1) {
+             var padding = 180; // in z22 pixels
+
+             var tl = projection([extent[0][0], extent[1][1]]);
+             var br = projection([extent[1][0], extent[0][1]]);
+             var hFactor = (br[0] - tl[0]) / (d[0] - padding);
+             var vFactor = (br[1] - tl[1]) / (d[1] - padding);
+             var hZoomDiff = Math.log(Math.abs(hFactor)) / Math.LN2;
+             var vZoomDiff = Math.log(Math.abs(vFactor)) / Math.LN2;
+             z = z - Math.max(hZoomDiff, vZoomDiff);
+             projection.scale(geoZoomToScale(z));
+           }
+
+           var padTop = 35; // reserve top space for hint text
+
+           var extentCenter = projection(extent.center());
+           extentCenter[1] = extentCenter[1] - padTop;
+           projection.translate(geoVecSubtract(c, extentCenter)).clipExtent([[0, 0], d]);
+           var drawLayers = svgLayers(projection, context).only(['osm', 'touch']).dimensions(d);
+           var drawVertices = svgVertices(projection, context);
+           var drawLines = svgLines(projection, context);
+           var drawTurns = svgTurns(projection, context);
+           var firstTime = selection.selectAll('.surface').empty();
+           selection.call(drawLayers);
+           var surface = selection.selectAll('.surface').classed('tr', true);
+
+           if (firstTime) {
+             _initialized = true;
+             surface.call(breathe);
+           } // This can happen if we've lowered the detail while a FROM way
+           // is selected, and that way is no longer part of the intersection.
 
-         if ( List$$1 ) ArrayList.__proto__ = List$$1;
-         ArrayList.prototype = Object.create( List$$1 && List$$1.prototype );
-         ArrayList.prototype.constructor = ArrayList;
 
-         ArrayList.prototype.ensureCapacity = function ensureCapacity () {};
-         ArrayList.prototype.interfaces_ = function interfaces_ () { return [List$$1, Collection] };
+           if (_fromWayID && !vgraph.hasEntity(_fromWayID)) {
+             _fromWayID = null;
+             _oldTurns = null;
+           }
 
-         /**
-          * @override
-          */
-         ArrayList.prototype.add = function add (e) {
-           if (arguments.length === 1) {
-             this.array_.push(e);
-           } else {
-             this.array_.splice(arguments[0], arguments[1]);
+           surface.call(utilSetDimensions, d).call(drawVertices, vgraph, _intersection.vertices, filter, extent, z).call(drawLines, vgraph, _intersection.ways, filter).call(drawTurns, vgraph, _intersection.turns(_fromWayID, _maxViaWay));
+           surface.on('click.restrictions', click).on('mouseover.restrictions', mouseover);
+           surface.selectAll('.selected').classed('selected', false);
+           surface.selectAll('.related').classed('related', false);
+           var way;
+
+           if (_fromWayID) {
+             way = vgraph.entity(_fromWayID);
+             surface.selectAll('.' + _fromWayID).classed('selected', true).classed('related', true);
            }
-           return true
-         };
 
-         ArrayList.prototype.clear = function clear () {
-           this.array_ = [];
-         };
+           document.addEventListener('resizeWindow', function () {
+             utilSetDimensions(_container, null);
+             redraw(1);
+           }, false);
+           updateHints(null);
 
-         /**
-          * @override
-          */
-         ArrayList.prototype.addAll = function addAll (c) {
-           var this$1 = this;
+           function click(d3_event) {
+             surface.call(breathe.off).call(breathe);
+             var datum = d3_event.target.__data__;
+             var entity = datum && datum.properties && datum.properties.entity;
 
-           for (var i = c.iterator(); i.hasNext();) {
-             this$1.add(i.next());
-           }
-           return true
-         };
+             if (entity) {
+               datum = entity;
+             }
 
-         /**
-          * @override
-          */
-         ArrayList.prototype.set = function set (index, element) {
-           var oldElement = this.array_[index];
-           this.array_[index] = element;
-           return oldElement
-         };
+             if (datum instanceof osmWay && (datum.__from || datum.__via)) {
+               _fromWayID = datum.id;
+               _oldTurns = null;
+               redraw();
+             } else if (datum instanceof osmTurn) {
+               var actions, extraActions, turns, i;
+               var restrictionType = osmInferRestriction(vgraph, datum, projection);
 
-         /**
-          * @override
-          */
-         ArrayList.prototype.iterator = function iterator () {
-           return new Iterator_(this)
-         };
+               if (datum.restrictionID && !datum.direct) {
+                 return;
+               } else if (datum.restrictionID && !datum.only) {
+                 // NO -> ONLY
+                 var seen = {};
+                 var datumOnly = JSON.parse(JSON.stringify(datum)); // deep clone the datum
 
-         /**
-          * @override
-          */
-         ArrayList.prototype.get = function get (index) {
-           if (index < 0 || index >= this.size()) {
-             throw new IndexOutOfBoundsException()
-           }
+                 datumOnly.only = true; // but change this property
 
-           return this.array_[index]
-         };
+                 restrictionType = restrictionType.replace(/^no/, 'only'); // Adding an ONLY restriction should destroy all other direct restrictions from the FROM towards the VIA.
+                 // We will remember them in _oldTurns, and restore them if the user clicks again.
 
-         /**
-          * @override
-          */
-         ArrayList.prototype.isEmpty = function isEmpty () {
-           return this.array_.length === 0
-         };
+                 turns = _intersection.turns(_fromWayID, 2);
+                 extraActions = [];
+                 _oldTurns = [];
 
-         /**
-          * @override
-          */
-         ArrayList.prototype.size = function size () {
-           return this.array_.length
-         };
+                 for (i = 0; i < turns.length; i++) {
+                   var turn = turns[i];
+                   if (seen[turn.restrictionID]) continue; // avoid deleting the turn twice (#4968, #4928)
 
-         /**
-          * @override
-          */
-         ArrayList.prototype.toArray = function toArray () {
-           var this$1 = this;
+                   if (turn.direct && turn.path[1] === datum.path[1]) {
+                     seen[turns[i].restrictionID] = true;
+                     turn.restrictionType = osmInferRestriction(vgraph, turn, projection);
 
-           var array = [];
+                     _oldTurns.push(turn);
 
-           for (var i = 0, len = this.array_.length; i < len; i++) {
-             array.push(this$1.array_[i]);
-           }
+                     extraActions.push(actionUnrestrictTurn(turn));
+                   }
+                 }
 
-           return array
-         };
+                 actions = _intersection.actions.concat(extraActions, [actionRestrictTurn(datumOnly, restrictionType), _t('operations.restriction.annotation.create')]);
+               } else if (datum.restrictionID) {
+                 // ONLY -> Allowed
+                 // Restore whatever restrictions we might have destroyed by cycling thru the ONLY state.
+                 // This relies on the assumption that the intersection was already split up when we
+                 // performed the previous action (NO -> ONLY), so the IDs in _oldTurns shouldn't have changed.
+                 turns = _oldTurns || [];
+                 extraActions = [];
 
-         /**
-          * @override
-          */
-         ArrayList.prototype.remove = function remove (o) {
-           var this$1 = this;
+                 for (i = 0; i < turns.length; i++) {
+                   if (turns[i].key !== datum.key) {
+                     extraActions.push(actionRestrictTurn(turns[i], turns[i].restrictionType));
+                   }
+                 }
 
-           var found = false;
+                 _oldTurns = null;
+                 actions = _intersection.actions.concat(extraActions, [actionUnrestrictTurn(datum), _t('operations.restriction.annotation.delete')]);
+               } else {
+                 // Allowed -> NO
+                 actions = _intersection.actions.concat([actionRestrictTurn(datum, restrictionType), _t('operations.restriction.annotation.create')]);
+               }
 
-           for (var i = 0, len = this.array_.length; i < len; i++) {
-             if (this$1.array_[i] === o) {
-               this$1.array_.splice(i, 1);
-               found = true;
-               break
+               context.perform.apply(context, actions); // At this point the datum will be changed, but will have same key..
+               // Refresh it and update the help..
+
+               var s = surface.selectAll('.' + datum.key);
+               datum = s.empty() ? null : s.datum();
+               updateHints(datum);
+             } else {
+               _fromWayID = null;
+               _oldTurns = null;
+               redraw();
              }
            }
 
-           return found
-         };
+           function mouseover(d3_event) {
+             var datum = d3_event.target.__data__;
+             updateHints(datum);
+           }
 
-         return ArrayList;
-       }(List));
+           _lastXPos = _lastXPos || sdims[0];
 
-       /**
-        * @extends {Iterator}
-        * @param {ArrayList} arrayList
-        * @constructor
-        * @private
-        */
-       var Iterator_ = (function (Iterator$$1) {
-         function Iterator_ (arrayList) {
-           Iterator$$1.call(this);
-           /**
-            * @type {ArrayList}
-            * @private
-           */
-           this.arrayList_ = arrayList;
-           /**
-            * @type {number}
-            * @private
-           */
-           this.position_ = 0;
-         }
+           function redraw(minChange) {
+             var xPos = -1;
+
+             if (minChange) {
+               xPos = utilGetDimensions(context.container().select('.sidebar'))[0];
+             }
 
-         if ( Iterator$$1 ) Iterator_.__proto__ = Iterator$$1;
-         Iterator_.prototype = Object.create( Iterator$$1 && Iterator$$1.prototype );
-         Iterator_.prototype.constructor = Iterator_;
+             if (!minChange || minChange && Math.abs(xPos - _lastXPos) >= minChange) {
+               if (context.hasEntity(_vertexID)) {
+                 _lastXPos = xPos;
 
-         /**
-          * @override
-          */
-         Iterator_.prototype.next = function next () {
-           if (this.position_ === this.arrayList_.size()) {
-             throw new NoSuchElementException()
+                 _container.call(renderViewer);
+               }
+             }
            }
-           return this.arrayList_.get(this.position_++)
-         };
 
-         /**
-          * @override
-          */
-         Iterator_.prototype.hasNext = function hasNext () {
-           if (this.position_ < this.arrayList_.size()) {
-             return true
-           } else {
-             return false
-           }
-         };
+           function highlightPathsFrom(wayID) {
+             surface.selectAll('.related').classed('related', false).classed('allow', false).classed('restrict', false).classed('only', false);
+             surface.selectAll('.' + wayID).classed('related', true);
 
-         /**
-          * TODO: should be in ListIterator
-          * @override
-          */
-         Iterator_.prototype.set = function set (element) {
-           return this.arrayList_.set(this.position_ - 1, element)
-         };
+             if (wayID) {
+               var turns = _intersection.turns(wayID, _maxViaWay);
 
-         /**
-          * @override
-          */
-         Iterator_.prototype.remove = function remove () {
-           this.arrayList_.remove(this.arrayList_.get(this.position_));
-         };
-
-         return Iterator_;
-       }(Iterator$1));
-
-       var CoordinateList = (function (ArrayList$$1) {
-         function CoordinateList () {
-           ArrayList$$1.call(this);
-           if (arguments.length === 0) ; else if (arguments.length === 1) {
-             var coord = arguments[0];
-             this.ensureCapacity(coord.length);
-             this.add(coord, true);
-           } else if (arguments.length === 2) {
-             var coord$1 = arguments[0];
-             var allowRepeated = arguments[1];
-             this.ensureCapacity(coord$1.length);
-             this.add(coord$1, allowRepeated);
-           }
-         }
-
-         if ( ArrayList$$1 ) CoordinateList.__proto__ = ArrayList$$1;
-         CoordinateList.prototype = Object.create( ArrayList$$1 && ArrayList$$1.prototype );
-         CoordinateList.prototype.constructor = CoordinateList;
-
-         var staticAccessors = { coordArrayType: { configurable: true } };
-         staticAccessors.coordArrayType.get = function () { return new Array(0).fill(null) };
-         CoordinateList.prototype.getCoordinate = function getCoordinate (i) {
-           return this.get(i)
-         };
-         CoordinateList.prototype.addAll = function addAll () {
-           var this$1 = this;
-
-           if (arguments.length === 2) {
-             var coll = arguments[0];
-             var allowRepeated = arguments[1];
-             var isChanged = false;
-             for (var i = coll.iterator(); i.hasNext();) {
-               this$1.add(i.next(), allowRepeated);
-               isChanged = true;
-             }
-             return isChanged
-           } else { return ArrayList$$1.prototype.addAll.apply(this, arguments) }
-         };
-         CoordinateList.prototype.clone = function clone () {
-           var this$1 = this;
-
-           var clone = ArrayList$$1.prototype.clone.call(this);
-           for (var i = 0; i < this.size(); i++) {
-             clone.add(i, this$1.get(i).copy());
-           }
-           return clone
-         };
-         CoordinateList.prototype.toCoordinateArray = function toCoordinateArray () {
-           return this.toArray(CoordinateList.coordArrayType)
-         };
-         CoordinateList.prototype.add = function add () {
-           var this$1 = this;
-
-           if (arguments.length === 1) {
-             var coord = arguments[0];
-             ArrayList$$1.prototype.add.call(this, coord);
-           } else if (arguments.length === 2) {
-             if (arguments[0] instanceof Array && typeof arguments[1] === 'boolean') {
-               var coord$1 = arguments[0];
-               var allowRepeated = arguments[1];
-               this.add(coord$1, allowRepeated, true);
-               return true
-             } else if (arguments[0] instanceof Coordinate && typeof arguments[1] === 'boolean') {
-               var coord$2 = arguments[0];
-               var allowRepeated$1 = arguments[1];
-               if (!allowRepeated$1) {
-                 if (this.size() >= 1) {
-                   var last = this.get(this.size() - 1);
-                   if (last.equals2D(coord$2)) { return null }
-                 }
-               }
-               ArrayList$$1.prototype.add.call(this, coord$2);
-             } else if (arguments[0] instanceof Object && typeof arguments[1] === 'boolean') {
-               var obj = arguments[0];
-               var allowRepeated$2 = arguments[1];
-               this.add(obj, allowRepeated$2);
-               return true
-             }
-           } else if (arguments.length === 3) {
-             if (typeof arguments[2] === 'boolean' && (arguments[0] instanceof Array && typeof arguments[1] === 'boolean')) {
-               var coord$3 = arguments[0];
-               var allowRepeated$3 = arguments[1];
-               var direction = arguments[2];
-               if (direction) {
-                 for (var i$1 = 0; i$1 < coord$3.length; i$1++) {
-                   this$1.add(coord$3[i$1], allowRepeated$3);
-                 }
-               } else {
-                 for (var i$2 = coord$3.length - 1; i$2 >= 0; i$2--) {
-                   this$1.add(coord$3[i$2], allowRepeated$3);
-                 }
-               }
-               return true
-             } else if (typeof arguments[2] === 'boolean' && (Number.isInteger(arguments[0]) && arguments[1] instanceof Coordinate)) {
-               var i$3 = arguments[0];
-               var coord$4 = arguments[1];
-               var allowRepeated$4 = arguments[2];
-               if (!allowRepeated$4) {
-                 var size = this.size();
-                 if (size > 0) {
-                   if (i$3 > 0) {
-                     var prev = this.get(i$3 - 1);
-                     if (prev.equals2D(coord$4)) { return null }
-                   }
-                   if (i$3 < size) {
-                     var next = this.get(i$3);
-                     if (next.equals2D(coord$4)) { return null }
+               for (var i = 0; i < turns.length; i++) {
+                 var turn = turns[i];
+                 var ids = [turn.to.way];
+                 var klass = turn.no ? 'restrict' : turn.only ? 'only' : 'allow';
+
+                 if (turn.only || turns.length === 1) {
+                   if (turn.via.ways) {
+                     ids = ids.concat(turn.via.ways);
                    }
+                 } else if (turn.to.way === wayID) {
+                   continue;
                  }
+
+                 surface.selectAll(utilEntitySelector(ids)).classed('related', true).classed('allow', klass === 'allow').classed('restrict', klass === 'restrict').classed('only', klass === 'only');
                }
-               ArrayList$$1.prototype.add.call(this, i$3, coord$4);
              }
-           } else if (arguments.length === 4) {
-             var coord$5 = arguments[0];
-             var allowRepeated$5 = arguments[1];
-             var start = arguments[2];
-             var end = arguments[3];
-             var inc = 1;
-             if (start > end) { inc = -1; }
-             for (var i = start; i !== end; i += inc) {
-               this$1.add(coord$5[i], allowRepeated$5);
-             }
-             return true
            }
-         };
-         CoordinateList.prototype.closeRing = function closeRing () {
-           if (this.size() > 0) { this.add(new Coordinate(this.get(0)), false); }
-         };
-         CoordinateList.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         CoordinateList.prototype.getClass = function getClass () {
-           return CoordinateList
-         };
 
-         Object.defineProperties( CoordinateList, staticAccessors );
+           function updateHints(datum) {
+             var help = _container.selectAll('.restriction-help').html('');
+
+             var placeholders = {};
+             ['from', 'via', 'to'].forEach(function (k) {
+               placeholders[k] = '<span class="qualifier">' + _t('restriction.help.' + k) + '</span>';
+             });
+             var entity = datum && datum.properties && datum.properties.entity;
+
+             if (entity) {
+               datum = entity;
+             }
+
+             if (_fromWayID) {
+               way = vgraph.entity(_fromWayID);
+               surface.selectAll('.' + _fromWayID).classed('selected', true).classed('related', true);
+             } // Hovering a way
+
+
+             if (datum instanceof osmWay && datum.__from) {
+               way = datum;
+               highlightPathsFrom(_fromWayID ? null : way.id);
+               surface.selectAll('.' + way.id).classed('related', true);
+               var clickSelect = !_fromWayID || _fromWayID !== way.id;
+               help.append('div') // "Click to select FROM {fromName}." / "FROM {fromName}"
+               .html(_t.html('restriction.help.' + (clickSelect ? 'select_from_name' : 'from_name'), {
+                 from: placeholders.from,
+                 fromName: displayName(way.id, vgraph)
+               })); // Hovering a turn arrow
+             } else if (datum instanceof osmTurn) {
+               var restrictionType = osmInferRestriction(vgraph, datum, projection);
+               var turnType = restrictionType.replace(/^(only|no)\_/, '');
+               var indirect = datum.direct === false ? _t.html('restriction.help.indirect') : '';
+               var klass, turnText, nextText;
+
+               if (datum.no) {
+                 klass = 'restrict';
+                 turnText = _t.html('restriction.help.turn.no_' + turnType, {
+                   indirect: indirect
+                 });
+                 nextText = _t.html('restriction.help.turn.only_' + turnType, {
+                   indirect: ''
+                 });
+               } else if (datum.only) {
+                 klass = 'only';
+                 turnText = _t.html('restriction.help.turn.only_' + turnType, {
+                   indirect: indirect
+                 });
+                 nextText = _t.html('restriction.help.turn.allowed_' + turnType, {
+                   indirect: ''
+                 });
+               } else {
+                 klass = 'allow';
+                 turnText = _t.html('restriction.help.turn.allowed_' + turnType, {
+                   indirect: indirect
+                 });
+                 nextText = _t.html('restriction.help.turn.no_' + turnType, {
+                   indirect: ''
+                 });
+               }
 
-         return CoordinateList;
-       }(ArrayList));
+               help.append('div') // "NO Right Turn (indirect)"
+               .attr('class', 'qualifier ' + klass).html(turnText);
+               help.append('div') // "FROM {fromName} TO {toName}"
+               .html(_t.html('restriction.help.from_name_to_name', {
+                 from: placeholders.from,
+                 fromName: displayName(datum.from.way, vgraph),
+                 to: placeholders.to,
+                 toName: displayName(datum.to.way, vgraph)
+               }));
 
-       var CoordinateArrays = function CoordinateArrays () {};
+               if (datum.via.ways && datum.via.ways.length) {
+                 var names = [];
 
-       var staticAccessors$13 = { ForwardComparator: { configurable: true },BidirectionalComparator: { configurable: true },coordArrayType: { configurable: true } };
+                 for (var i = 0; i < datum.via.ways.length; i++) {
+                   var prev = names[names.length - 1];
+                   var curr = displayName(datum.via.ways[i], vgraph);
+                   if (!prev || curr !== prev) // collapse identical names
+                     names.push(curr);
+                 }
 
-       staticAccessors$13.ForwardComparator.get = function () { return ForwardComparator };
-       staticAccessors$13.BidirectionalComparator.get = function () { return BidirectionalComparator };
-       staticAccessors$13.coordArrayType.get = function () { return new Array(0).fill(null) };
+                 help.append('div') // "VIA {viaNames}"
+                 .html(_t.html('restriction.help.via_names', {
+                   via: placeholders.via,
+                   viaNames: names.join(', ')
+                 }));
+               }
 
-       CoordinateArrays.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       CoordinateArrays.prototype.getClass = function getClass () {
-         return CoordinateArrays
-       };
-       CoordinateArrays.isRing = function isRing (pts) {
-         if (pts.length < 4) { return false }
-         if (!pts[0].equals2D(pts[pts.length - 1])) { return false }
-         return true
-       };
-       CoordinateArrays.ptNotInList = function ptNotInList (testPts, pts) {
-         for (var i = 0; i < testPts.length; i++) {
-           var testPt = testPts[i];
-           if (CoordinateArrays.indexOf(testPt, pts) < 0) { return testPt }
-         }
-         return null
-       };
-       CoordinateArrays.scroll = function scroll (coordinates, firstCoordinate) {
-         var i = CoordinateArrays.indexOf(firstCoordinate, coordinates);
-         if (i < 0) { return null }
-         var newCoordinates = new Array(coordinates.length).fill(null);
-         System.arraycopy(coordinates, i, newCoordinates, 0, coordinates.length - i);
-         System.arraycopy(coordinates, 0, newCoordinates, coordinates.length - i, i);
-         System.arraycopy(newCoordinates, 0, coordinates, 0, coordinates.length);
-       };
-       CoordinateArrays.equals = function equals () {
-         if (arguments.length === 2) {
-           var coord1 = arguments[0];
-           var coord2 = arguments[1];
-           if (coord1 === coord2) { return true }
-           if (coord1 === null || coord2 === null) { return false }
-           if (coord1.length !== coord2.length) { return false }
-           for (var i = 0; i < coord1.length; i++) {
-             if (!coord1[i].equals(coord2[i])) { return false }
-           }
-           return true
-         } else if (arguments.length === 3) {
-           var coord1$1 = arguments[0];
-           var coord2$1 = arguments[1];
-           var coordinateComparator = arguments[2];
-           if (coord1$1 === coord2$1) { return true }
-           if (coord1$1 === null || coord2$1 === null) { return false }
-           if (coord1$1.length !== coord2$1.length) { return false }
-           for (var i$1 = 0; i$1 < coord1$1.length; i$1++) {
-             if (coordinateComparator.compare(coord1$1[i$1], coord2$1[i$1]) !== 0) { return false }
-           }
-           return true
-         }
-       };
-       CoordinateArrays.intersection = function intersection (coordinates, env) {
-         var coordList = new CoordinateList();
-         for (var i = 0; i < coordinates.length; i++) {
-           if (env.intersects(coordinates[i])) { coordList.add(coordinates[i], true); }
-         }
-         return coordList.toCoordinateArray()
-       };
-       CoordinateArrays.hasRepeatedPoints = function hasRepeatedPoints (coord) {
-         for (var i = 1; i < coord.length; i++) {
-           if (coord[i - 1].equals(coord[i])) {
-             return true
-           }
-         }
-         return false
-       };
-       CoordinateArrays.removeRepeatedPoints = function removeRepeatedPoints (coord) {
-         if (!CoordinateArrays.hasRepeatedPoints(coord)) { return coord }
-         var coordList = new CoordinateList(coord, false);
-         return coordList.toCoordinateArray()
-       };
-       CoordinateArrays.reverse = function reverse (coord) {
-         var last = coord.length - 1;
-         var mid = Math.trunc(last / 2);
-         for (var i = 0; i <= mid; i++) {
-           var tmp = coord[i];
-           coord[i] = coord[last - i];
-           coord[last - i] = tmp;
-         }
-       };
-       CoordinateArrays.removeNull = function removeNull (coord) {
-         var nonNull = 0;
-         for (var i = 0; i < coord.length; i++) {
-           if (coord[i] !== null) { nonNull++; }
-         }
-         var newCoord = new Array(nonNull).fill(null);
-         if (nonNull === 0) { return newCoord }
-         var j = 0;
-         for (var i$1 = 0; i$1 < coord.length; i$1++) {
-           if (coord[i$1] !== null) { newCoord[j++] = coord[i$1]; }
-         }
-         return newCoord
-       };
-       CoordinateArrays.copyDeep = function copyDeep () {
-         if (arguments.length === 1) {
-           var coordinates = arguments[0];
-           var copy = new Array(coordinates.length).fill(null);
-           for (var i = 0; i < coordinates.length; i++) {
-             copy[i] = new Coordinate(coordinates[i]);
-           }
-           return copy
-         } else if (arguments.length === 5) {
-           var src = arguments[0];
-           var srcStart = arguments[1];
-           var dest = arguments[2];
-           var destStart = arguments[3];
-           var length = arguments[4];
-           for (var i$1 = 0; i$1 < length; i$1++) {
-             dest[destStart + i$1] = new Coordinate(src[srcStart + i$1]);
+               if (!indirect) {
+                 help.append('div') // Click for "No Right Turn"
+                 .html(_t.html('restriction.help.toggle', {
+                   turn: nextText.trim()
+                 }));
+               }
+
+               highlightPathsFrom(null);
+               var alongIDs = datum.path.slice();
+               surface.selectAll(utilEntitySelector(alongIDs)).classed('related', true).classed('allow', klass === 'allow').classed('restrict', klass === 'restrict').classed('only', klass === 'only'); // Hovering empty surface
+             } else {
+               highlightPathsFrom(null);
+
+               if (_fromWayID) {
+                 help.append('div') // "FROM {fromName}"
+                 .html(_t.html('restriction.help.from_name', {
+                   from: placeholders.from,
+                   fromName: displayName(_fromWayID, vgraph)
+                 }));
+               } else {
+                 help.append('div') // "Click to select a FROM segment."
+                 .html(_t.html('restriction.help.select_from', {
+                   from: placeholders.from
+                 }));
+               }
+             }
            }
          }
-       };
-       CoordinateArrays.isEqualReversed = function isEqualReversed (pts1, pts2) {
-         for (var i = 0; i < pts1.length; i++) {
-           var p1 = pts1[i];
-           var p2 = pts2[pts1.length - i - 1];
-           if (p1.compareTo(p2) !== 0) { return false }
-         }
-         return true
-       };
-       CoordinateArrays.envelope = function envelope (coordinates) {
-         var env = new Envelope();
-         for (var i = 0; i < coordinates.length; i++) {
-           env.expandToInclude(coordinates[i]);
-         }
-         return env
-       };
-       CoordinateArrays.toCoordinateArray = function toCoordinateArray (coordList) {
-         return coordList.toArray(CoordinateArrays.coordArrayType)
-       };
-       CoordinateArrays.atLeastNCoordinatesOrNothing = function atLeastNCoordinatesOrNothing (n, c) {
-         return c.length >= n ? c : []
-       };
-       CoordinateArrays.indexOf = function indexOf (coordinate, coordinates) {
-         for (var i = 0; i < coordinates.length; i++) {
-           if (coordinate.equals(coordinates[i])) {
-             return i
+
+         function displayMaxDistance(maxDist) {
+           var isImperial = !_mainLocalizer.usesMetric();
+           var opts;
+
+           if (isImperial) {
+             var distToFeet = {
+               // imprecise conversion for prettier display
+               20: 70,
+               25: 85,
+               30: 100,
+               35: 115,
+               40: 130,
+               45: 145,
+               50: 160
+             }[maxDist];
+             opts = {
+               distance: _t('units.feet', {
+                 quantity: distToFeet
+               })
+             };
+           } else {
+             opts = {
+               distance: _t('units.meters', {
+                 quantity: maxDist
+               })
+             };
            }
+
+           return _t.html('restriction.controls.distance_up_to', opts);
          }
-         return -1
-       };
-       CoordinateArrays.increasingDirection = function increasingDirection (pts) {
-         for (var i = 0; i < Math.trunc(pts.length / 2); i++) {
-           var j = pts.length - 1 - i;
-           var comp = pts[i].compareTo(pts[j]);
-           if (comp !== 0) { return comp }
-         }
-         return 1
-       };
-       CoordinateArrays.compare = function compare (pts1, pts2) {
-         var i = 0;
-         while (i < pts1.length && i < pts2.length) {
-           var compare = pts1[i].compareTo(pts2[i]);
-           if (compare !== 0) { return compare }
-           i++;
+
+         function displayMaxVia(maxVia) {
+           return maxVia === 0 ? _t.html('restriction.controls.via_node_only') : maxVia === 1 ? _t.html('restriction.controls.via_up_to_one') : _t.html('restriction.controls.via_up_to_two');
          }
-         if (i < pts2.length) { return -1 }
-         if (i < pts1.length) { return 1 }
-         return 0
-       };
-       CoordinateArrays.minCoordinate = function minCoordinate (coordinates) {
-         var minCoord = null;
-         for (var i = 0; i < coordinates.length; i++) {
-           if (minCoord === null || minCoord.compareTo(coordinates[i]) > 0) {
-             minCoord = coordinates[i];
-           }
+
+         function displayName(entityID, graph) {
+           var entity = graph.entity(entityID);
+           var name = utilDisplayName(entity) || '';
+           var matched = _mainPresetIndex.match(entity, graph);
+           var type = matched && matched.name() || utilDisplayType(entity.id);
+           return name || type;
          }
-         return minCoord
-       };
-       CoordinateArrays.extract = function extract (pts, start, end) {
-         start = MathUtil.clamp(start, 0, pts.length);
-         end = MathUtil.clamp(end, -1, pts.length);
-         var npts = end - start + 1;
-         if (end < 0) { npts = 0; }
-         if (start >= pts.length) { npts = 0; }
-         if (end < start) { npts = 0; }
-         var extractPts = new Array(npts).fill(null);
-         if (npts === 0) { return extractPts }
-         var iPts = 0;
-         for (var i = start; i <= end; i++) {
-           extractPts[iPts++] = pts[i];
-         }
-         return extractPts
-       };
 
-       Object.defineProperties( CoordinateArrays, staticAccessors$13 );
+         restrictions.entityIDs = function (val) {
+           _intersection = null;
+           _fromWayID = null;
+           _oldTurns = null;
+           _vertexID = val[0];
+         };
 
-       var ForwardComparator = function ForwardComparator () {};
+         restrictions.tags = function () {};
 
-       ForwardComparator.prototype.compare = function compare (o1, o2) {
-         var pts1 = o1;
-         var pts2 = o2;
-         return CoordinateArrays.compare(pts1, pts2)
-       };
-       ForwardComparator.prototype.interfaces_ = function interfaces_ () {
-         return [Comparator]
-       };
-       ForwardComparator.prototype.getClass = function getClass () {
-         return ForwardComparator
-       };
+         restrictions.focus = function () {};
 
-       var BidirectionalComparator = function BidirectionalComparator () {};
-
-       BidirectionalComparator.prototype.compare = function compare (o1, o2) {
-         var pts1 = o1;
-         var pts2 = o2;
-         if (pts1.length < pts2.length) { return -1 }
-         if (pts1.length > pts2.length) { return 1 }
-         if (pts1.length === 0) { return 0 }
-         var forwardComp = CoordinateArrays.compare(pts1, pts2);
-         var isEqualRev = CoordinateArrays.isEqualReversed(pts1, pts2);
-         if (isEqualRev) { return 0 }
-         return forwardComp
-       };
-       BidirectionalComparator.prototype.OLDcompare = function OLDcompare (o1, o2) {
-         var pts1 = o1;
-         var pts2 = o2;
-         if (pts1.length < pts2.length) { return -1 }
-         if (pts1.length > pts2.length) { return 1 }
-         if (pts1.length === 0) { return 0 }
-         var dir1 = CoordinateArrays.increasingDirection(pts1);
-         var dir2 = CoordinateArrays.increasingDirection(pts2);
-         var i1 = dir1 > 0 ? 0 : pts1.length - 1;
-         var i2 = dir2 > 0 ? 0 : pts1.length - 1;
-         for (var i = 0; i < pts1.length; i++) {
-           var comparePt = pts1[i1].compareTo(pts2[i2]);
-           if (comparePt !== 0) { return comparePt }
-           i1 += dir1;
-           i2 += dir2;
-         }
-         return 0
-       };
-       BidirectionalComparator.prototype.interfaces_ = function interfaces_ () {
-         return [Comparator]
-       };
-       BidirectionalComparator.prototype.getClass = function getClass () {
-         return BidirectionalComparator
-       };
+         restrictions.off = function (selection) {
+           if (!_initialized) return;
+           selection.selectAll('.surface').call(breathe.off).on('click.restrictions', null).on('mouseover.restrictions', null);
+           select(window).on('resize.restrictions', null);
+         };
 
-       /**
-        * @see http://download.oracle.com/javase/6/docs/api/java/util/Map.html
-        *
-        * @constructor
-        * @private
-        */
-       var Map$1$1 = function Map () {};
+         return utilRebind(restrictions, dispatch$1, 'on');
+       }
+       uiFieldRestrictions.supportsMultiselection = false;
 
-       Map$1$1.prototype.get = function get () {};
-       /**
-        * Associates the specified value with the specified key in this map (optional
-        * operation).
-        * @param {Object} key
-        * @param {Object} value
-        * @return {Object}
-        */
-       Map$1$1.prototype.put = function put () {};
+       function uiFieldTextarea(field, context) {
+         var dispatch$1 = dispatch('change');
+         var input = select(null);
 
-       /**
-        * Returns the number of key-value mappings in this map.
-        * @return {number}
-        */
-       Map$1$1.prototype.size = function size () {};
+         var _tags;
 
-       /**
-        * Returns a Collection view of the values contained in this map.
-        * @return {javascript.util.Collection}
-        */
-       Map$1$1.prototype.values = function values () {};
+         function textarea(selection) {
+           var wrap = selection.selectAll('.form-field-input-wrap').data([0]);
+           wrap = wrap.enter().append('div').attr('class', 'form-field-input-wrap form-field-input-' + field.type).merge(wrap);
+           input = wrap.selectAll('textarea').data([0]);
+           input = input.enter().append('textarea').attr('id', field.domId).call(utilNoAuto).on('input', change(true)).on('blur', change()).on('change', change()).merge(input);
+         }
 
-       /**
-        * Returns a {@link Set} view of the mappings contained in this map.
-        * The set is backed by the map, so changes to the map are
-        * reflected in the set, and vice-versa.If the map is modified
-        * while an iteration over the set is in progress (except through
-        * the iterator's own <tt>remove</tt> operation, or through the
-        * <tt>setValue</tt> operation on a map entry returned by the
-        * iterator) the results of the iteration are undefined.The set
-        * supports element removal, which removes the corresponding
-        * mapping from the map, via the <tt>Iterator.remove</tt>,
-        * <tt>Set.remove</tt>, <tt>removeAll</tt>, <tt>retainAll</tt> and
-        * <tt>clear</tt> operations.It does not support the
-        * <tt>add</tt> or <tt>addAll</tt> operations.
-        *
-        * @return {Set} a set view of the mappings contained in this map
-        */
-       Map$1$1.prototype.entrySet = function entrySet () {};
+         function change(onInput) {
+           return function () {
+             var val = utilGetSetValue(input);
+             if (!onInput) val = context.cleanTagValue(val); // don't override multiple values with blank string
 
-       /**
-        * @see http://download.oracle.com/javase/6/docs/api/java/util/SortedMap.html
-        *
-        * @extends {Map}
-        * @constructor
-        * @private
-        */
-       var SortedMap = (function (Map) {
-               function SortedMap () {
-                       Map.apply(this, arguments);
-               }if ( Map ) SortedMap.__proto__ = Map;
-               SortedMap.prototype = Object.create( Map && Map.prototype );
-               SortedMap.prototype.constructor = SortedMap;
+             if (!val && Array.isArray(_tags[field.key])) return;
+             var t = {};
+             t[field.key] = val || undefined;
+             dispatch$1.call('change', this, t, onInput);
+           };
+         }
 
-               
+         textarea.tags = function (tags) {
+           _tags = tags;
+           var isMixed = Array.isArray(tags[field.key]);
+           utilGetSetValue(input, !isMixed && tags[field.key] ? tags[field.key] : '').attr('title', isMixed ? tags[field.key].filter(Boolean).join('\n') : undefined).attr('placeholder', isMixed ? _t('inspector.multiple_values') : field.placeholder() || _t('inspector.unknown')).classed('mixed', isMixed);
+         };
 
-               return SortedMap;
-       }(Map$1$1));
+         textarea.focus = function () {
+           input.node().focus();
+         };
 
-       /**
-        * @param {string=} message Optional message
-        * @extends {Error}
-        * @constructor
-        * @private
-        */
-       function OperationNotSupported (message) {
-         this.message = message || '';
+         return utilRebind(textarea, dispatch$1, 'on');
        }
-       OperationNotSupported.prototype = new Error();
 
-       /**
-        * @type {string}
-        */
-       OperationNotSupported.prototype.name = 'OperationNotSupported';
+       function uiFieldWikidata(field, context) {
+         var wikidata = services.wikidata;
+         var dispatch$1 = dispatch('change');
 
-       /**
-        * @see http://download.oracle.com/javase/6/docs/api/java/util/Set.html
-        *
-        * @extends {Collection}
-        * @constructor
-        * @private
-        */
-       function Set$2() {}
-       Set$2.prototype = new Collection();
+         var _selection = select(null);
 
+         var _searchInput = select(null);
 
-       /**
-        * Returns true if this set contains the specified element. More formally,
-        * returns true if and only if this set contains an element e such that (o==null ?
-        * e==null : o.equals(e)).
-        * @param {Object} e
-        * @return {boolean}
-        */
-       Set$2.prototype.contains = function() {};
+         var _qid = null;
+         var _wikidataEntity = null;
+         var _wikiURL = '';
+         var _entityIDs = [];
 
-       /**
-        * @see http://docs.oracle.com/javase/6/docs/api/java/util/HashSet.html
-        *
-        * @extends {javascript.util.Set}
-        * @constructor
-        * @private
-        */
-       var HashSet = (function (Set$$1) {
-         function HashSet () {
-           Set$$1.call(this);
-           this.array_ = [];
+         var _wikipediaKey = field.keys && field.keys.find(function (key) {
+           return key.includes('wikipedia');
+         }),
+             _hintKey = field.key === 'wikidata' ? 'name' : field.key.split(':')[0];
 
-           if (arguments[0] instanceof Collection) {
-             this.addAll(arguments[0]);
-           }
-         }
+         var combobox = uiCombobox(context, 'combo-' + field.safeid).caseSensitive(true).minItems(1);
 
-         if ( Set$$1 ) HashSet.__proto__ = Set$$1;
-         HashSet.prototype = Object.create( Set$$1 && Set$$1.prototype );
-         HashSet.prototype.constructor = HashSet;
+         function wiki(selection) {
+           _selection = selection;
+           var wrap = selection.selectAll('.form-field-input-wrap').data([0]);
+           wrap = wrap.enter().append('div').attr('class', 'form-field-input-wrap form-field-input-' + field.type).merge(wrap);
+           var list = wrap.selectAll('ul').data([0]);
+           list = list.enter().append('ul').attr('class', 'rows').merge(list);
+           var searchRow = list.selectAll('li.wikidata-search').data([0]);
+           var searchRowEnter = searchRow.enter().append('li').attr('class', 'wikidata-search');
+           searchRowEnter.append('input').attr('type', 'text').attr('id', field.domId).style('flex', '1').call(utilNoAuto).on('focus', function () {
+             var node = select(this).node();
+             node.setSelectionRange(0, node.value.length);
+           }).on('blur', function () {
+             setLabelForEntity();
+           }).call(combobox.fetcher(fetchWikidataItems));
+           combobox.on('accept', function (d) {
+             if (d) {
+               _qid = d.id;
+               change();
+             }
+           }).on('cancel', function () {
+             setLabelForEntity();
+           });
+           searchRowEnter.append('button').attr('class', 'form-field-button wiki-link').attr('title', _t('icons.view_on', {
+             domain: 'wikidata.org'
+           })).call(svgIcon('#iD-icon-out-link')).on('click', function (d3_event) {
+             d3_event.preventDefault();
+             if (_wikiURL) window.open(_wikiURL, '_blank');
+           });
+           searchRow = searchRow.merge(searchRowEnter);
+           _searchInput = searchRow.select('input');
+           var wikidataProperties = ['description', 'identifier'];
+           var items = list.selectAll('li.labeled-input').data(wikidataProperties); // Enter
 
-         /**
-          * @override
-          */
-         HashSet.prototype.contains = function contains (o) {
-           var this$1 = this;
+           var enter = items.enter().append('li').attr('class', function (d) {
+             return 'labeled-input preset-wikidata-' + d;
+           });
+           enter.append('span').attr('class', 'label').html(function (d) {
+             return _t.html('wikidata.' + d);
+           });
+           enter.append('input').attr('type', 'text').call(utilNoAuto).classed('disabled', 'true').attr('readonly', 'true');
+           enter.append('button').attr('class', 'form-field-button').attr('title', _t('icons.copy')).call(svgIcon('#iD-operation-copy')).on('click', function (d3_event) {
+             d3_event.preventDefault();
+             select(this.parentNode).select('input').node().select();
+             document.execCommand('copy');
+           });
+         }
 
-           for (var i = 0, len = this.array_.length; i < len; i++) {
-             var e = this$1.array_[i];
-             if (e === o) {
-               return true
-             }
-           }
-           return false
-         };
+         function fetchWikidataItems(q, callback) {
+           if (!q && _hintKey) {
+             // other tags may be good search terms
+             for (var i in _entityIDs) {
+               var entity = context.hasEntity(_entityIDs[i]);
 
-         /**
-          * @override
-          */
-         HashSet.prototype.add = function add (o) {
-           if (this.contains(o)) {
-             return false
+               if (entity.tags[_hintKey]) {
+                 q = entity.tags[_hintKey];
+                 break;
+               }
+             }
            }
 
-           this.array_.push(o);
-
-           return true
-         };
-
-         /**
-          * @override
-          */
-         HashSet.prototype.addAll = function addAll (c) {
-           var this$1 = this;
+           wikidata.itemsForSearchQuery(q, function (err, data) {
+             if (err) return;
 
-           for (var i = c.iterator(); i.hasNext();) {
-             this$1.add(i.next());
-           }
-           return true
-         };
+             for (var i in data) {
+               data[i].value = data[i].label + ' (' + data[i].id + ')';
+               data[i].title = data[i].description;
+             }
 
-         /**
-          * @override
-          */
-         HashSet.prototype.remove = function remove (o) {
-           // throw new javascript.util.OperationNotSupported()
-           throw new Error()
-         };
+             if (callback) callback(data);
+           });
+         }
 
-         /**
-          * @override
-          */
-         HashSet.prototype.size = function size () {
-           return this.array_.length
-         };
+         function change() {
+           var syncTags = {};
+           syncTags[field.key] = _qid;
+           dispatch$1.call('change', this, syncTags); // attempt asynchronous update of wikidata tag..
 
-         /**
-          * @override
-          */
-         HashSet.prototype.isEmpty = function isEmpty () {
-           return this.array_.length === 0
-         };
+           var initGraph = context.graph();
+           var initEntityIDs = _entityIDs;
+           wikidata.entityByQID(_qid, function (err, entity) {
+             if (err) return; // If graph has changed, we can't apply this update.
 
-         /**
-          * @override
-          */
-         HashSet.prototype.toArray = function toArray () {
-           var this$1 = this;
+             if (context.graph() !== initGraph) return;
+             if (!entity.sitelinks) return;
+             var langs = wikidata.languagesToQuery(); // use the label and description languages as fallbacks
 
-           var array = [];
+             ['labels', 'descriptions'].forEach(function (key) {
+               if (!entity[key]) return;
+               var valueLangs = Object.keys(entity[key]);
+               if (valueLangs.length === 0) return;
+               var valueLang = valueLangs[0];
 
-           for (var i = 0, len = this.array_.length; i < len; i++) {
-             array.push(this$1.array_[i]);
-           }
+               if (langs.indexOf(valueLang) === -1) {
+                 langs.push(valueLang);
+               }
+             });
+             var newWikipediaValue;
 
-           return array
-         };
+             if (_wikipediaKey) {
+               var foundPreferred;
 
-         /**
-          * @override
-          */
-         HashSet.prototype.iterator = function iterator () {
-           return new Iterator_$1(this)
-         };
+               for (var i in langs) {
+                 var lang = langs[i];
+                 var siteID = lang.replace('-', '_') + 'wiki';
 
-         return HashSet;
-       }(Set$2));
+                 if (entity.sitelinks[siteID]) {
+                   foundPreferred = true;
+                   newWikipediaValue = lang + ':' + entity.sitelinks[siteID].title; // use the first match
 
-       /**
-          * @extends {Iterator}
-          * @param {HashSet} hashSet
-          * @constructor
-          * @private
-          */
-       var Iterator_$1 = (function (Iterator$$1) {
-         function Iterator_ (hashSet) {
-           Iterator$$1.call(this);
-           /**
-            * @type {HashSet}
-            * @private
-            */
-           this.hashSet_ = hashSet;
-           /**
-            * @type {number}
-            * @private
-            */
-           this.position_ = 0;
-         }
+                   break;
+                 }
+               }
 
-         if ( Iterator$$1 ) Iterator_.__proto__ = Iterator$$1;
-         Iterator_.prototype = Object.create( Iterator$$1 && Iterator$$1.prototype );
-         Iterator_.prototype.constructor = Iterator_;
+               if (!foundPreferred) {
+                 // No wikipedia sites available in the user's language or the fallback languages,
+                 // default to any wikipedia sitelink
+                 var wikiSiteKeys = Object.keys(entity.sitelinks).filter(function (site) {
+                   return site.endsWith('wiki');
+                 });
 
-         /**
-          * @override
-          */
-         Iterator_.prototype.next = function next () {
-           if (this.position_ === this.hashSet_.size()) {
-             throw new NoSuchElementException()
-           }
-           return this.hashSet_.array_[this.position_++]
-         };
+                 if (wikiSiteKeys.length === 0) {
+                   // if no wikipedia pages are linked to this wikidata entity, delete that tag
+                   newWikipediaValue = null;
+                 } else {
+                   var wikiLang = wikiSiteKeys[0].slice(0, -4).replace('_', '-');
+                   var wikiTitle = entity.sitelinks[wikiSiteKeys[0]].title;
+                   newWikipediaValue = wikiLang + ':' + wikiTitle;
+                 }
+               }
+             }
 
-         /**
-          * @override
-          */
-         Iterator_.prototype.hasNext = function hasNext () {
-           if (this.position_ < this.hashSet_.size()) {
-             return true
-           } else {
-             return false
-           }
-         };
+             if (newWikipediaValue) {
+               newWikipediaValue = context.cleanTagValue(newWikipediaValue);
+             }
 
-         /**
-          * @override
-          */
-         Iterator_.prototype.remove = function remove () {
-           throw new OperationNotSupported()
-         };
+             if (typeof newWikipediaValue === 'undefined') return;
+             var actions = initEntityIDs.map(function (entityID) {
+               var entity = context.hasEntity(entityID);
+               if (!entity) return null;
+               var currTags = Object.assign({}, entity.tags); // shallow copy
 
-         return Iterator_;
-       }(Iterator$1));
+               if (newWikipediaValue === null) {
+                 if (!currTags[_wikipediaKey]) return null;
+                 delete currTags[_wikipediaKey];
+               } else {
+                 currTags[_wikipediaKey] = newWikipediaValue;
+               }
 
-       var BLACK = 0;
-       var RED = 1;
-       function colorOf (p) { return (p === null ? BLACK : p.color) }
-       function parentOf (p) { return (p === null ? null : p.parent) }
-       function setColor (p, c) { if (p !== null) { p.color = c; } }
-       function leftOf (p) { return (p === null ? null : p.left) }
-       function rightOf (p) { return (p === null ? null : p.right) }
+               return actionChangeTags(entityID, currTags);
+             }).filter(Boolean);
+             if (!actions.length) return; // Coalesce the update of wikidata tag into the previous tag change
 
-       /**
-        * @see http://download.oracle.com/javase/6/docs/api/java/util/TreeMap.html
-        *
-        * @extends {SortedMap}
-        * @constructor
-        * @private
-        */
-       function TreeMap () {
-         /**
-          * @type {Object}
-          * @private
-          */
-         this.root_ = null;
-         /**
-          * @type {number}
-          * @private
-         */
-         this.size_ = 0;
-       }
-       TreeMap.prototype = new SortedMap();
+             context.overwrite(function actionUpdateWikipediaTags(graph) {
+               actions.forEach(function (action) {
+                 graph = action(graph);
+               });
+               return graph;
+             }, context.history().undoAnnotation()); // do not dispatch.call('change') here, because entity_editor
+             // changeTags() is not intended to be called asynchronously
+           });
+         }
 
-       /**
-        * @override
-        */
-       TreeMap.prototype.get = function (key) {
-         var p = this.root_;
-         while (p !== null) {
-           var cmp = key['compareTo'](p.key);
-           if (cmp < 0) { p = p.left; }
-           else if (cmp > 0) { p = p.right; }
-           else { return p.value }
-         }
-         return null
-       };
+         function setLabelForEntity() {
+           var label = '';
 
-       /**
-        * @override
-        */
-       TreeMap.prototype.put = function (key, value) {
-         if (this.root_ === null) {
-           this.root_ = {
-             key: key,
-             value: value,
-             left: null,
-             right: null,
-             parent: null,
-             color: BLACK,
-             getValue: function getValue () { return this.value },
-             getKey: function getKey () { return this.key }
-           };
-           this.size_ = 1;
-           return null
-         }
-         var t = this.root_;
-         var parent;
-         var cmp;
-         do {
-           parent = t;
-           cmp = key['compareTo'](t.key);
-           if (cmp < 0) {
-             t = t.left;
-           } else if (cmp > 0) {
-             t = t.right;
-           } else {
-             var oldValue = t.value;
-             t.value = value;
-             return oldValue
-           }
-         } while (t !== null)
-         var e = {
-           key: key,
-           left: null,
-           right: null,
-           value: value,
-           parent: parent,
-           color: BLACK,
-           getValue: function getValue () { return this.value },
-           getKey: function getKey () { return this.key }
-         };
-         if (cmp < 0) {
-           parent.left = e;
-         } else {
-           parent.right = e;
-         }
-         this.fixAfterInsertion(e);
-         this.size_++;
-         return null
-       };
+           if (_wikidataEntity) {
+             label = entityPropertyForDisplay(_wikidataEntity, 'labels');
 
-       /**
-        * @param {Object} x
-        */
-       TreeMap.prototype.fixAfterInsertion = function (x) {
-         var this$1 = this;
-
-         x.color = RED;
-         while (x != null && x !== this.root_ && x.parent.color === RED) {
-           if (parentOf(x) === leftOf(parentOf(parentOf(x)))) {
-             var y = rightOf(parentOf(parentOf(x)));
-             if (colorOf(y) === RED) {
-               setColor(parentOf(x), BLACK);
-               setColor(y, BLACK);
-               setColor(parentOf(parentOf(x)), RED);
-               x = parentOf(parentOf(x));
-             } else {
-               if (x === rightOf(parentOf(x))) {
-                 x = parentOf(x);
-                 this$1.rotateLeft(x);
-               }
-               setColor(parentOf(x), BLACK);
-               setColor(parentOf(parentOf(x)), RED);
-               this$1.rotateRight(parentOf(parentOf(x)));
-             }
-           } else {
-             var y$1 = leftOf(parentOf(parentOf(x)));
-             if (colorOf(y$1) === RED) {
-               setColor(parentOf(x), BLACK);
-               setColor(y$1, BLACK);
-               setColor(parentOf(parentOf(x)), RED);
-               x = parentOf(parentOf(x));
-             } else {
-               if (x === leftOf(parentOf(x))) {
-                 x = parentOf(x);
-                 this$1.rotateRight(x);
-               }
-               setColor(parentOf(x), BLACK);
-               setColor(parentOf(parentOf(x)), RED);
-               this$1.rotateLeft(parentOf(parentOf(x)));
+             if (label.length === 0) {
+               label = _wikidataEntity.id.toString();
              }
            }
-         }
-         this.root_.color = BLACK;
-       };
 
-       /**
-        * @override
-        */
-       TreeMap.prototype.values = function () {
-         var arrayList = new ArrayList();
-         var p = this.getFirstEntry();
-         if (p !== null) {
-           arrayList.add(p.value);
-           while ((p = TreeMap.successor(p)) !== null) {
-             arrayList.add(p.value);
-           }
+           utilGetSetValue(_searchInput, label);
          }
-         return arrayList
-       };
 
-       /**
-        * @override
-        */
-       TreeMap.prototype.entrySet = function () {
-         var hashSet = new HashSet();
-         var p = this.getFirstEntry();
-         if (p !== null) {
-           hashSet.add(p);
-           while ((p = TreeMap.successor(p)) !== null) {
-             hashSet.add(p);
-           }
-         }
-         return hashSet
-       };
+         wiki.tags = function (tags) {
+           var isMixed = Array.isArray(tags[field.key]);
 
-       /**
-        * @param {Object} p
-        */
-       TreeMap.prototype.rotateLeft = function (p) {
-         if (p != null) {
-           var r = p.right;
-           p.right = r.left;
-           if (r.left != null) { r.left.parent = p; }
-           r.parent = p.parent;
-           if (p.parent === null) { this.root_ = r; } else if (p.parent.left === p) { p.parent.left = r; } else { p.parent.right = r; }
-           r.left = p;
-           p.parent = r;
-         }
-       };
+           _searchInput.attr('title', isMixed ? tags[field.key].filter(Boolean).join('\n') : null).attr('placeholder', isMixed ? _t('inspector.multiple_values') : '').classed('mixed', isMixed);
 
-       /**
-        * @param {Object} p
-        */
-       TreeMap.prototype.rotateRight = function (p) {
-         if (p != null) {
-           var l = p.left;
-           p.left = l.right;
-           if (l.right != null) { l.right.parent = p; }
-           l.parent = p.parent;
-           if (p.parent === null) { this.root_ = l; } else if (p.parent.right === p) { p.parent.right = l; } else { p.parent.left = l; }
-           l.right = p;
-           p.parent = l;
-         }
-       };
+           _qid = typeof tags[field.key] === 'string' && tags[field.key] || '';
 
-       /**
-        * @return {Object}
-        */
-       TreeMap.prototype.getFirstEntry = function () {
-         var p = this.root_;
-         if (p != null) {
-           while (p.left != null) {
-             p = p.left;
-           }
-         }
-         return p
-       };
+           if (!/^Q[0-9]*$/.test(_qid)) {
+             // not a proper QID
+             unrecognized();
+             return;
+           } // QID value in correct format
 
-       /**
-        * @param {Object} t
-        * @return {Object}
-        * @private
-        */
-       TreeMap.successor = function (t) {
-         if (t === null) { return null } else if (t.right !== null) {
-           var p = t.right;
-           while (p.left !== null) {
-             p = p.left;
-           }
-           return p
-         } else {
-           var p$1 = t.parent;
-           var ch = t;
-           while (p$1 !== null && ch === p$1.right) {
-             ch = p$1;
-             p$1 = p$1.parent;
-           }
-           return p$1
-         }
-       };
 
-       /**
-        * @override
-        */
-       TreeMap.prototype.size = function () {
-         return this.size_
-       };
+           _wikiURL = 'https://wikidata.org/wiki/' + _qid;
+           wikidata.entityByQID(_qid, function (err, entity) {
+             if (err) {
+               unrecognized();
+               return;
+             }
 
-       var Lineal = function Lineal () {};
+             _wikidataEntity = entity;
+             setLabelForEntity();
+             var description = entityPropertyForDisplay(entity, 'descriptions');
 
-       Lineal.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       Lineal.prototype.getClass = function getClass () {
-         return Lineal
-       };
+             _selection.select('button.wiki-link').classed('disabled', false);
 
-       /**
-        * @see http://download.oracle.com/javase/6/docs/api/java/util/SortedSet.html
-        *
-        * @extends {Set}
-        * @constructor
-        * @private
-        */
-       function SortedSet () {}
-       SortedSet.prototype = new Set$2();
+             _selection.select('.preset-wikidata-description').style('display', function () {
+               return description.length > 0 ? 'flex' : 'none';
+             }).select('input').attr('value', description);
 
-       // import Iterator from './Iterator'
-       /**
-        * @see http://download.oracle.com/javase/6/docs/api/java/util/TreeSet.html
-        *
-        * @extends {SortedSet}
-        * @constructor
-        * @private
-        */
-       function TreeSet () {
-         /**
-          * @type {Array}
-          * @private
-         */
-         this.array_ = [];
+             _selection.select('.preset-wikidata-identifier').style('display', function () {
+               return entity.id ? 'flex' : 'none';
+             }).select('input').attr('value', entity.id);
+           }); // not a proper QID
 
-         if (arguments[0] instanceof Collection) {
-           this.addAll(arguments[0]);
-         }
-       }
-       TreeSet.prototype = new SortedSet();
+           function unrecognized() {
+             _wikidataEntity = null;
+             setLabelForEntity();
 
-       /**
-        * @override
-        */
-       TreeSet.prototype.contains = function (o) {
-         var this$1 = this;
+             _selection.select('.preset-wikidata-description').style('display', 'none');
+
+             _selection.select('.preset-wikidata-identifier').style('display', 'none');
 
-         for (var i = 0, len = this.array_.length; i < len; i++) {
-           var e = this$1.array_[i];
-           if (e['compareTo'](o) === 0) {
-             return true
+             _selection.select('button.wiki-link').classed('disabled', true);
+
+             if (_qid && _qid !== '') {
+               _wikiURL = 'https://wikidata.org/wiki/Special:Search?search=' + _qid;
+             } else {
+               _wikiURL = '';
+             }
            }
-         }
-         return false
-       };
+         };
 
-       /**
-        * @override
-        */
-       TreeSet.prototype.add = function (o) {
-         var this$1 = this;
+         function entityPropertyForDisplay(wikidataEntity, propKey) {
+           if (!wikidataEntity[propKey]) return '';
+           var propObj = wikidataEntity[propKey];
+           var langKeys = Object.keys(propObj);
+           if (langKeys.length === 0) return ''; // sorted by priority, since we want to show the user's language first if possible
 
-         if (this.contains(o)) {
-           return false
-         }
+           var langs = wikidata.languagesToQuery();
 
-         for (var i = 0, len = this.array_.length; i < len; i++) {
-           var e = this$1.array_[i];
-           if (e['compareTo'](o) === 1) {
-             this$1.array_.splice(i, 0, o);
-             return true
-           }
+           for (var i in langs) {
+             var lang = langs[i];
+             var valueObj = propObj[lang];
+             if (valueObj && valueObj.value && valueObj.value.length > 0) return valueObj.value;
+           } // default to any available value
+
+
+           return propObj[langKeys[0]].value;
          }
 
-         this.array_.push(o);
+         wiki.entityIDs = function (val) {
+           if (!arguments.length) return _entityIDs;
+           _entityIDs = val;
+           return wiki;
+         };
 
-         return true
-       };
+         wiki.focus = function () {
+           _searchInput.node().focus();
+         };
 
-       /**
-        * @override
-        */
-       TreeSet.prototype.addAll = function (c) {
-         var this$1 = this;
+         return utilRebind(wiki, dispatch$1, 'on');
+       }
 
-         for (var i = c.iterator(); i.hasNext();) {
-           this$1.add(i.next());
-         }
-         return true
-       };
+       function uiFieldWikipedia(field, context) {
+         var _arguments = arguments;
+         var dispatch$1 = dispatch('change');
+         var wikipedia = services.wikipedia;
+         var wikidata = services.wikidata;
 
-       /**
-        * @override
-        */
-       TreeSet.prototype.remove = function (e) {
-         throw new OperationNotSupported()
-       };
+         var _langInput = select(null);
 
-       /**
-        * @override
-        */
-       TreeSet.prototype.size = function () {
-         return this.array_.length
-       };
+         var _titleInput = select(null);
 
-       /**
-        * @override
-        */
-       TreeSet.prototype.isEmpty = function () {
-         return this.array_.length === 0
-       };
+         var _wikiURL = '';
 
-       /**
-        * @override
-        */
-       TreeSet.prototype.toArray = function () {
-         var this$1 = this;
+         var _entityIDs;
 
-         var array = [];
+         var _tags;
 
-         for (var i = 0, len = this.array_.length; i < len; i++) {
-           array.push(this$1.array_[i]);
-         }
+         var _dataWikipedia = [];
+         _mainFileFetcher.get('wmf_sitematrix').then(function (d) {
+           _dataWikipedia = d;
+           if (_tags) updateForTags(_tags);
+         })["catch"](function () {
+           /* ignore */
+         });
+         var langCombo = uiCombobox(context, 'wikipedia-lang').fetcher(function (value, callback) {
+           var v = value.toLowerCase();
+           callback(_dataWikipedia.filter(function (d) {
+             return d[0].toLowerCase().indexOf(v) >= 0 || d[1].toLowerCase().indexOf(v) >= 0 || d[2].toLowerCase().indexOf(v) >= 0;
+           }).map(function (d) {
+             return {
+               value: d[1]
+             };
+           }));
+         });
+         var titleCombo = uiCombobox(context, 'wikipedia-title').fetcher(function (value, callback) {
+           if (!value) {
+             value = '';
 
-         return array
-       };
+             for (var i in _entityIDs) {
+               var entity = context.hasEntity(_entityIDs[i]);
 
-       /**
-        * @override
-        */
-       TreeSet.prototype.iterator = function () {
-         return new Iterator_$2(this)
-       };
+               if (entity.tags.name) {
+                 value = entity.tags.name;
+                 break;
+               }
+             }
+           }
 
-       /**
-        * @extends {javascript.util.Iterator}
-        * @param {javascript.util.TreeSet} treeSet
-        * @constructor
-        * @private
-        */
-       var Iterator_$2 = function (treeSet) {
-         /**
-          * @type {javascript.util.TreeSet}
-          * @private
-          */
-         this.treeSet_ = treeSet;
-         /**
-          * @type {number}
-          * @private
-          */
-         this.position_ = 0;
-       };
+           var searchfn = value.length > 7 ? wikipedia.search : wikipedia.suggestions;
+           searchfn(language()[2], value, function (query, data) {
+             callback(data.map(function (d) {
+               return {
+                 value: d
+               };
+             }));
+           });
+         });
 
-       /**
-        * @override
-        */
-       Iterator_$2.prototype.next = function () {
-         if (this.position_ === this.treeSet_.size()) {
-           throw new NoSuchElementException()
-         }
-         return this.treeSet_.array_[this.position_++]
-       };
+         function wiki(selection) {
+           var wrap = selection.selectAll('.form-field-input-wrap').data([0]);
+           wrap = wrap.enter().append('div').attr('class', "form-field-input-wrap form-field-input-".concat(field.type)).merge(wrap);
+           var langContainer = wrap.selectAll('.wiki-lang-container').data([0]);
+           langContainer = langContainer.enter().append('div').attr('class', 'wiki-lang-container').merge(langContainer);
+           _langInput = langContainer.selectAll('input.wiki-lang').data([0]);
+           _langInput = _langInput.enter().append('input').attr('type', 'text').attr('class', 'wiki-lang').attr('placeholder', _t('translate.localized_translation_language')).call(utilNoAuto).call(langCombo).merge(_langInput);
+
+           _langInput.on('blur', changeLang).on('change', changeLang);
+
+           var titleContainer = wrap.selectAll('.wiki-title-container').data([0]);
+           titleContainer = titleContainer.enter().append('div').attr('class', 'wiki-title-container').merge(titleContainer);
+           _titleInput = titleContainer.selectAll('input.wiki-title').data([0]);
+           _titleInput = _titleInput.enter().append('input').attr('type', 'text').attr('class', 'wiki-title').attr('id', field.domId).call(utilNoAuto).call(titleCombo).merge(_titleInput);
+
+           _titleInput.on('blur', function () {
+             change(true);
+           }).on('change', function () {
+             change(false);
+           });
 
-       /**
-        * @override
-        */
-       Iterator_$2.prototype.hasNext = function () {
-         if (this.position_ < this.treeSet_.size()) {
-           return true
-         } else {
-           return false
+           var link = titleContainer.selectAll('.wiki-link').data([0]);
+           link = link.enter().append('button').attr('class', 'form-field-button wiki-link').attr('title', _t('icons.view_on', {
+             domain: 'wikipedia.org'
+           })).call(svgIcon('#iD-icon-out-link')).merge(link);
+           link.on('click', function (d3_event) {
+             d3_event.preventDefault();
+             if (_wikiURL) window.open(_wikiURL, '_blank');
+           });
          }
-       };
 
-       /**
-        * @override
-        */
-       Iterator_$2.prototype.remove = function () {
-         throw new OperationNotSupported()
-       };
+         function defaultLanguageInfo(skipEnglishFallback) {
+           var langCode = _mainLocalizer.languageCode().toLowerCase();
 
-       /**
-        * @see http://download.oracle.com/javase/6/docs/api/java/util/Arrays.html
-        *
-        * @constructor
-        * @private
-        */
-       var Arrays = function Arrays () {};
+           for (var i in _dataWikipedia) {
+             var d = _dataWikipedia[i]; // default to the language of iD's current locale
 
-       Arrays.sort = function sort () {
-         var a = arguments[0];
-         var i;
-         var t;
-         var comparator;
-         var compare;
-         if (arguments.length === 1) {
-           compare = function (a, b) {
-             return a.compareTo(b)
-           };
-           a.sort(compare);
-         } else if (arguments.length === 2) {
-           comparator = arguments[1];
-           compare = function (a, b) {
-             return comparator['compare'](a, b)
-           };
-           a.sort(compare);
-         } else if (arguments.length === 3) {
-           t = a.slice(arguments[1], arguments[2]);
-           t.sort();
-           var r = a.slice(0, arguments[1]).concat(t, a.slice(arguments[2], a.length));
-           a.splice(0, a.length);
-           for (i = 0; i < r.length; i++) {
-             a.push(r[i]);
-           }
-         } else if (arguments.length === 4) {
-           t = a.slice(arguments[1], arguments[2]);
-           comparator = arguments[3];
-           compare = function (a, b) {
-             return comparator['compare'](a, b)
-           };
-           t.sort(compare);
-           r = a.slice(0, arguments[1]).concat(t, a.slice(arguments[2], a.length));
-           a.splice(0, a.length);
-           for (i = 0; i < r.length; i++) {
-             a.push(r[i]);
-           }
-         }
-       };
-       /**
-        * @param {Array} array
-        * @return {ArrayList}
-        */
-       Arrays.asList = function asList (array) {
-         var arrayList = new ArrayList();
-         for (var i = 0, len = array.length; i < len; i++) {
-           arrayList.add(array[i]);
-         }
-         return arrayList
-       };
+             if (d[2] === langCode) return d;
+           } // fallback to English
 
-       var Dimension = function Dimension () {};
-
-       var staticAccessors$14 = { P: { configurable: true },L: { configurable: true },A: { configurable: true },FALSE: { configurable: true },TRUE: { configurable: true },DONTCARE: { configurable: true },SYM_FALSE: { configurable: true },SYM_TRUE: { configurable: true },SYM_DONTCARE: { configurable: true },SYM_P: { configurable: true },SYM_L: { configurable: true },SYM_A: { configurable: true } };
-
-       staticAccessors$14.P.get = function () { return 0 };
-       staticAccessors$14.L.get = function () { return 1 };
-       staticAccessors$14.A.get = function () { return 2 };
-       staticAccessors$14.FALSE.get = function () { return -1 };
-       staticAccessors$14.TRUE.get = function () { return -2 };
-       staticAccessors$14.DONTCARE.get = function () { return -3 };
-       staticAccessors$14.SYM_FALSE.get = function () { return 'F' };
-       staticAccessors$14.SYM_TRUE.get = function () { return 'T' };
-       staticAccessors$14.SYM_DONTCARE.get = function () { return '*' };
-       staticAccessors$14.SYM_P.get = function () { return '0' };
-       staticAccessors$14.SYM_L.get = function () { return '1' };
-       staticAccessors$14.SYM_A.get = function () { return '2' };
-
-       Dimension.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       Dimension.prototype.getClass = function getClass () {
-         return Dimension
-       };
-       Dimension.toDimensionSymbol = function toDimensionSymbol (dimensionValue) {
-         switch (dimensionValue) {
-           case Dimension.FALSE:
-             return Dimension.SYM_FALSE
-           case Dimension.TRUE:
-             return Dimension.SYM_TRUE
-           case Dimension.DONTCARE:
-             return Dimension.SYM_DONTCARE
-           case Dimension.P:
-             return Dimension.SYM_P
-           case Dimension.L:
-             return Dimension.SYM_L
-           case Dimension.A:
-             return Dimension.SYM_A
-         }
-         throw new IllegalArgumentException('Unknown dimension value: ' + dimensionValue)
-       };
-       Dimension.toDimensionValue = function toDimensionValue (dimensionSymbol) {
-         switch (Character.toUpperCase(dimensionSymbol)) {
-           case Dimension.SYM_FALSE:
-             return Dimension.FALSE
-           case Dimension.SYM_TRUE:
-             return Dimension.TRUE
-           case Dimension.SYM_DONTCARE:
-             return Dimension.DONTCARE
-           case Dimension.SYM_P:
-             return Dimension.P
-           case Dimension.SYM_L:
-             return Dimension.L
-           case Dimension.SYM_A:
-             return Dimension.A
-         }
-         throw new IllegalArgumentException('Unknown dimension symbol: ' + dimensionSymbol)
-       };
 
-       Object.defineProperties( Dimension, staticAccessors$14 );
+           return skipEnglishFallback ? ['', '', ''] : ['English', 'English', 'en'];
+         }
 
-       var GeometryFilter = function GeometryFilter () {};
+         function language(skipEnglishFallback) {
+           var value = utilGetSetValue(_langInput).toLowerCase();
 
-       GeometryFilter.prototype.filter = function filter (geom) {};
-       GeometryFilter.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       GeometryFilter.prototype.getClass = function getClass () {
-         return GeometryFilter
-       };
+           for (var i in _dataWikipedia) {
+             var d = _dataWikipedia[i]; // return the language already set in the UI, if supported
 
-       var CoordinateSequenceFilter = function CoordinateSequenceFilter () {};
+             if (d[0].toLowerCase() === value || d[1].toLowerCase() === value || d[2] === value) return d;
+           } // fallback to English
 
-       CoordinateSequenceFilter.prototype.filter = function filter (seq, i) {};
-       CoordinateSequenceFilter.prototype.isDone = function isDone () {};
-       CoordinateSequenceFilter.prototype.isGeometryChanged = function isGeometryChanged () {};
-       CoordinateSequenceFilter.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       CoordinateSequenceFilter.prototype.getClass = function getClass () {
-         return CoordinateSequenceFilter
-       };
 
-       var GeometryCollection = (function (Geometry$$1) {
-         function GeometryCollection (geometries, factory) {
-           Geometry$$1.call(this, factory);
-           this._geometries = geometries || [];
+           return defaultLanguageInfo(skipEnglishFallback);
+         }
 
-           if (Geometry$$1.hasNullElements(this._geometries)) {
-             throw new IllegalArgumentException('geometries must not contain null elements')
-           }
+         function changeLang() {
+           utilGetSetValue(_langInput, language()[1]);
+           change(true);
          }
 
-         if ( Geometry$$1 ) GeometryCollection.__proto__ = Geometry$$1;
-         GeometryCollection.prototype = Object.create( Geometry$$1 && Geometry$$1.prototype );
-         GeometryCollection.prototype.constructor = GeometryCollection;
+         function change(skipWikidata) {
+           var value = utilGetSetValue(_titleInput);
+           var m = value.match(/https?:\/\/([-a-z]+)\.wikipedia\.org\/(?:wiki|\1-[-a-z]+)\/([^#]+)(?:#(.+))?/);
 
-         var staticAccessors = { serialVersionUID: { configurable: true } };
-         GeometryCollection.prototype.computeEnvelopeInternal = function computeEnvelopeInternal () {
-           var this$1 = this;
+           var langInfo = m && _dataWikipedia.find(function (d) {
+             return m[1] === d[2];
+           });
 
-           var envelope = new Envelope();
-           for (var i = 0; i < this._geometries.length; i++) {
-             envelope.expandToInclude(this$1._geometries[i].getEnvelopeInternal());
-           }
-           return envelope
-         };
-         GeometryCollection.prototype.getGeometryN = function getGeometryN (n) {
-           return this._geometries[n]
-         };
-         GeometryCollection.prototype.getSortIndex = function getSortIndex () {
-           return Geometry$$1.SORTINDEX_GEOMETRYCOLLECTION
-         };
-         GeometryCollection.prototype.getCoordinates = function getCoordinates () {
-           var this$1 = this;
+           var syncTags = {};
 
-           var coordinates = new Array(this.getNumPoints()).fill(null);
-           var k = -1;
-           for (var i = 0; i < this._geometries.length; i++) {
-             var childCoordinates = this$1._geometries[i].getCoordinates();
-             for (var j = 0; j < childCoordinates.length; j++) {
-               k++;
-               coordinates[k] = childCoordinates[j];
-             }
-           }
-           return coordinates
-         };
-         GeometryCollection.prototype.getArea = function getArea () {
-           var this$1 = this;
+           if (langInfo) {
+             var nativeLangName = langInfo[1]; // Normalize title http://www.mediawiki.org/wiki/API:Query#Title_normalization
 
-           var area = 0.0;
-           for (var i = 0; i < this._geometries.length; i++) {
-             area += this$1._geometries[i].getArea();
-           }
-           return area
-         };
-         GeometryCollection.prototype.equalsExact = function equalsExact () {
-           var this$1 = this;
+             value = decodeURIComponent(m[2]).replace(/_/g, ' ');
 
-           if (arguments.length === 2) {
-             var other = arguments[0];
-             var tolerance = arguments[1];
-             if (!this.isEquivalentClass(other)) {
-               return false
-             }
-             var otherCollection = other;
-             if (this._geometries.length !== otherCollection._geometries.length) {
-               return false
-             }
-             for (var i = 0; i < this._geometries.length; i++) {
-               if (!this$1._geometries[i].equalsExact(otherCollection._geometries[i], tolerance)) {
-                 return false
-               }
-             }
-             return true
-           } else { return Geometry$$1.prototype.equalsExact.apply(this, arguments) }
-         };
-         GeometryCollection.prototype.normalize = function normalize () {
-           var this$1 = this;
+             if (m[3]) {
+               var anchor; // try {
+               // leave this out for now - #6232
+               // Best-effort `anchordecode:` implementation
+               // anchor = decodeURIComponent(m[3].replace(/\.([0-9A-F]{2})/g, '%$1'));
+               // } catch (e) {
 
-           for (var i = 0; i < this._geometries.length; i++) {
-             this$1._geometries[i].normalize();
-           }
-           Arrays.sort(this._geometries);
-         };
-         GeometryCollection.prototype.getCoordinate = function getCoordinate () {
-           if (this.isEmpty()) { return null }
-           return this._geometries[0].getCoordinate()
-         };
-         GeometryCollection.prototype.getBoundaryDimension = function getBoundaryDimension () {
-           var this$1 = this;
+               anchor = decodeURIComponent(m[3]); // }
 
-           var dimension = Dimension.FALSE;
-           for (var i = 0; i < this._geometries.length; i++) {
-             dimension = Math.max(dimension, this$1._geometries[i].getBoundaryDimension());
-           }
-           return dimension
-         };
-         GeometryCollection.prototype.getDimension = function getDimension () {
-           var this$1 = this;
+               value += '#' + anchor.replace(/_/g, ' ');
+             }
 
-           var dimension = Dimension.FALSE;
-           for (var i = 0; i < this._geometries.length; i++) {
-             dimension = Math.max(dimension, this$1._geometries[i].getDimension());
+             value = value.slice(0, 1).toUpperCase() + value.slice(1);
+             utilGetSetValue(_langInput, nativeLangName);
+             utilGetSetValue(_titleInput, value);
            }
-           return dimension
-         };
-         GeometryCollection.prototype.getLength = function getLength () {
-           var this$1 = this;
 
-           var sum = 0.0;
-           for (var i = 0; i < this._geometries.length; i++) {
-             sum += this$1._geometries[i].getLength();
+           if (value) {
+             syncTags.wikipedia = context.cleanTagValue(language()[2] + ':' + value);
+           } else {
+             syncTags.wikipedia = undefined;
            }
-           return sum
-         };
-         GeometryCollection.prototype.getNumPoints = function getNumPoints () {
-           var this$1 = this;
 
-           var numPoints = 0;
-           for (var i = 0; i < this._geometries.length; i++) {
-             numPoints += this$1._geometries[i].getNumPoints();
-           }
-           return numPoints
-         };
-         GeometryCollection.prototype.getNumGeometries = function getNumGeometries () {
-           return this._geometries.length
-         };
-         GeometryCollection.prototype.reverse = function reverse () {
-           var this$1 = this;
+           dispatch$1.call('change', this, syncTags);
+           if (skipWikidata || !value || !language()[2]) return; // attempt asynchronous update of wikidata tag..
 
-           var n = this._geometries.length;
-           var revGeoms = new Array(n).fill(null);
-           for (var i = 0; i < this._geometries.length; i++) {
-             revGeoms[i] = this$1._geometries[i].reverse();
-           }
-           return this.getFactory().createGeometryCollection(revGeoms)
-         };
-         GeometryCollection.prototype.compareToSameClass = function compareToSameClass () {
-           var this$1 = this;
+           var initGraph = context.graph();
+           var initEntityIDs = _entityIDs;
+           wikidata.itemsByTitle(language()[2], value, function (err, data) {
+             if (err || !data || !Object.keys(data).length) return; // If graph has changed, we can't apply this update.
 
-           if (arguments.length === 1) {
-             var o = arguments[0];
-             var theseElements = new TreeSet(Arrays.asList(this._geometries));
-             var otherElements = new TreeSet(Arrays.asList(o._geometries));
-             return this.compare(theseElements, otherElements)
-           } else if (arguments.length === 2) {
-             var o$1 = arguments[0];
-             var comp = arguments[1];
-             var gc = o$1;
-             var n1 = this.getNumGeometries();
-             var n2 = gc.getNumGeometries();
-             var i = 0;
-             while (i < n1 && i < n2) {
-               var thisGeom = this$1.getGeometryN(i);
-               var otherGeom = gc.getGeometryN(i);
-               var holeComp = thisGeom.compareToSameClass(otherGeom, comp);
-               if (holeComp !== 0) { return holeComp }
-               i++;
-             }
-             if (i < n1) { return 1 }
-             if (i < n2) { return -1 }
-             return 0
-           }
-         };
-         GeometryCollection.prototype.apply = function apply () {
-           var this$1 = this;
+             if (context.graph() !== initGraph) return;
+             var qids = Object.keys(data);
+             var value = qids && qids.find(function (id) {
+               return id.match(/^Q\d+$/);
+             });
+             var actions = initEntityIDs.map(function (entityID) {
+               var entity = context.entity(entityID).tags;
+               var currTags = Object.assign({}, entity); // shallow copy
 
-           if (hasInterface(arguments[0], CoordinateFilter)) {
-             var filter = arguments[0];
-             for (var i = 0; i < this._geometries.length; i++) {
-               this$1._geometries[i].apply(filter);
-             }
-           } else if (hasInterface(arguments[0], CoordinateSequenceFilter)) {
-             var filter$1 = arguments[0];
-             if (this._geometries.length === 0) { return null }
-             for (var i$1 = 0; i$1 < this._geometries.length; i$1++) {
-               this$1._geometries[i$1].apply(filter$1);
-               if (filter$1.isDone()) {
-                 break
+               if (currTags.wikidata !== value) {
+                 currTags.wikidata = value;
+                 return actionChangeTags(entityID, currTags);
                }
-             }
-             if (filter$1.isGeometryChanged()) { this.geometryChanged(); }
-           } else if (hasInterface(arguments[0], GeometryFilter)) {
-             var filter$2 = arguments[0];
-             filter$2.filter(this);
-             for (var i$2 = 0; i$2 < this._geometries.length; i$2++) {
-               this$1._geometries[i$2].apply(filter$2);
-             }
-           } else if (hasInterface(arguments[0], GeometryComponentFilter)) {
-             var filter$3 = arguments[0];
-             filter$3.filter(this);
-             for (var i$3 = 0; i$3 < this._geometries.length; i$3++) {
-               this$1._geometries[i$3].apply(filter$3);
-             }
-           }
-         };
-         GeometryCollection.prototype.getBoundary = function getBoundary () {
-           this.checkNotGeometryCollection(this);
-           Assert.shouldNeverReachHere();
-           return null
-         };
-         GeometryCollection.prototype.clone = function clone () {
-           var this$1 = this;
 
-           var gc = Geometry$$1.prototype.clone.call(this);
-           gc._geometries = new Array(this._geometries.length).fill(null);
-           for (var i = 0; i < this._geometries.length; i++) {
-             gc._geometries[i] = this$1._geometries[i].clone();
-           }
-           return gc
-         };
-         GeometryCollection.prototype.getGeometryType = function getGeometryType () {
-           return 'GeometryCollection'
-         };
-         GeometryCollection.prototype.copy = function copy () {
-           var this$1 = this;
+               return null;
+             }).filter(Boolean);
+             if (!actions.length) return; // Coalesce the update of wikidata tag into the previous tag change
 
-           var geometries = new Array(this._geometries.length).fill(null);
-           for (var i = 0; i < geometries.length; i++) {
-             geometries[i] = this$1._geometries[i].copy();
-           }
-           return new GeometryCollection(geometries, this._factory)
-         };
-         GeometryCollection.prototype.isEmpty = function isEmpty () {
-           var this$1 = this;
+             context.overwrite(function actionUpdateWikidataTags(graph) {
+               actions.forEach(function (action) {
+                 graph = action(graph);
+               });
+               return graph;
+             }, context.history().undoAnnotation()); // do not dispatch.call('change') here, because entity_editor
+             // changeTags() is not intended to be called asynchronously
+           });
+         }
 
-           for (var i = 0; i < this._geometries.length; i++) {
-             if (!this$1._geometries[i].isEmpty()) {
-               return false
-             }
-           }
-           return true
-         };
-         GeometryCollection.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         GeometryCollection.prototype.getClass = function getClass () {
-           return GeometryCollection
+         wiki.tags = function (tags) {
+           _tags = tags;
+           updateForTags(tags);
          };
-         staticAccessors.serialVersionUID.get = function () { return -5694727726395021467 };
 
-         Object.defineProperties( GeometryCollection, staticAccessors );
+         function updateForTags(tags) {
+           var value = typeof tags[field.key] === 'string' ? tags[field.key] : ''; // Expect tag format of `tagLang:tagArticleTitle`, e.g. `fr:Paris`, with
+           // optional suffix of `#anchor`
 
-         return GeometryCollection;
-       }(Geometry));
+           var m = value.match(/([^:]+):([^#]+)(?:#(.+))?/);
+           var tagLang = m && m[1];
+           var tagArticleTitle = m && m[2];
+           var anchor = m && m[3];
 
-       var MultiLineString = (function (GeometryCollection$$1) {
-         function MultiLineString () {
-           GeometryCollection$$1.apply(this, arguments);
-         }
+           var tagLangInfo = tagLang && _dataWikipedia.find(function (d) {
+             return tagLang === d[2];
+           }); // value in correct format
 
-         if ( GeometryCollection$$1 ) MultiLineString.__proto__ = GeometryCollection$$1;
-         MultiLineString.prototype = Object.create( GeometryCollection$$1 && GeometryCollection$$1.prototype );
-         MultiLineString.prototype.constructor = MultiLineString;
 
-         var staticAccessors = { serialVersionUID: { configurable: true } };
+           if (tagLangInfo) {
+             var nativeLangName = tagLangInfo[1];
+             utilGetSetValue(_langInput, nativeLangName);
+             utilGetSetValue(_titleInput, tagArticleTitle + (anchor ? '#' + anchor : ''));
 
-         MultiLineString.prototype.getSortIndex = function getSortIndex () {
-           return Geometry.SORTINDEX_MULTILINESTRING
-         };
-         MultiLineString.prototype.equalsExact = function equalsExact () {
-           if (arguments.length === 2) {
-             var other = arguments[0];
-             var tolerance = arguments[1];
-             if (!this.isEquivalentClass(other)) {
-               return false
+             if (anchor) {
+               try {
+                 // Best-effort `anchorencode:` implementation
+                 anchor = encodeURIComponent(anchor.replace(/ /g, '_')).replace(/%/g, '.');
+               } catch (e) {
+                 anchor = anchor.replace(/ /g, '_');
+               }
              }
-             return GeometryCollection$$1.prototype.equalsExact.call(this, other, tolerance)
-           } else { return GeometryCollection$$1.prototype.equalsExact.apply(this, arguments) }
-         };
-         MultiLineString.prototype.getBoundaryDimension = function getBoundaryDimension () {
-           if (this.isClosed()) {
-             return Dimension.FALSE
-           }
-           return 0
-         };
-         MultiLineString.prototype.isClosed = function isClosed () {
-           var this$1 = this;
 
-           if (this.isEmpty()) {
-             return false
-           }
-           for (var i = 0; i < this._geometries.length; i++) {
-             if (!this$1._geometries[i].isClosed()) {
-               return false
+             _wikiURL = 'https://' + tagLang + '.wikipedia.org/wiki/' + tagArticleTitle.replace(/ /g, '_') + (anchor ? '#' + anchor : ''); // unrecognized value format
+           } else {
+             utilGetSetValue(_titleInput, value);
+
+             if (value && value !== '') {
+               utilGetSetValue(_langInput, '');
+               var defaultLangInfo = defaultLanguageInfo();
+               _wikiURL = "https://".concat(defaultLangInfo[2], ".wikipedia.org/w/index.php?fulltext=1&search=").concat(value);
+             } else {
+               var shownOrDefaultLangInfo = language(true
+               /* skipEnglishFallback */
+               );
+               utilGetSetValue(_langInput, shownOrDefaultLangInfo[1]);
+               _wikiURL = '';
              }
            }
-           return true
-         };
-         MultiLineString.prototype.getDimension = function getDimension () {
-           return 1
-         };
-         MultiLineString.prototype.reverse = function reverse () {
-           var this$1 = this;
+         }
 
-           var nLines = this._geometries.length;
-           var revLines = new Array(nLines).fill(null);
-           for (var i = 0; i < this._geometries.length; i++) {
-             revLines[nLines - 1 - i] = this$1._geometries[i].reverse();
-           }
-           return this.getFactory().createMultiLineString(revLines)
-         };
-         MultiLineString.prototype.getBoundary = function getBoundary () {
-           return new BoundaryOp(this).getBoundary()
-         };
-         MultiLineString.prototype.getGeometryType = function getGeometryType () {
-           return 'MultiLineString'
+         wiki.entityIDs = function (val) {
+           if (!_arguments.length) return _entityIDs;
+           _entityIDs = val;
+           return wiki;
          };
-         MultiLineString.prototype.copy = function copy () {
-           var this$1 = this;
 
-           var lineStrings = new Array(this._geometries.length).fill(null);
-           for (var i = 0; i < lineStrings.length; i++) {
-             lineStrings[i] = this$1._geometries[i].copy();
-           }
-           return new MultiLineString(lineStrings, this._factory)
-         };
-         MultiLineString.prototype.interfaces_ = function interfaces_ () {
-           return [Lineal]
-         };
-         MultiLineString.prototype.getClass = function getClass () {
-           return MultiLineString
+         wiki.focus = function () {
+           _titleInput.node().focus();
          };
-         staticAccessors.serialVersionUID.get = function () { return 8166665132445433741 };
 
-         Object.defineProperties( MultiLineString, staticAccessors );
-
-         return MultiLineString;
-       }(GeometryCollection));
+         return utilRebind(wiki, dispatch$1, 'on');
+       }
+       uiFieldWikipedia.supportsMultiselection = false;
 
-       var BoundaryOp = function BoundaryOp () {
-         this._geom = null;
-         this._geomFact = null;
-         this._bnRule = null;
-         this._endpointMap = null;
-         if (arguments.length === 1) {
-           var geom = arguments[0];
-           var bnRule = BoundaryNodeRule.MOD2_BOUNDARY_RULE;
-           this._geom = geom;
-           this._geomFact = geom.getFactory();
-           this._bnRule = bnRule;
-         } else if (arguments.length === 2) {
-           var geom$1 = arguments[0];
-           var bnRule$1 = arguments[1];
-           this._geom = geom$1;
-           this._geomFact = geom$1.getFactory();
-           this._bnRule = bnRule$1;
-         }
-       };
-       BoundaryOp.prototype.boundaryMultiLineString = function boundaryMultiLineString (mLine) {
-         if (this._geom.isEmpty()) {
-           return this.getEmptyMultiPoint()
-         }
-         var bdyPts = this.computeBoundaryCoordinates(mLine);
-         if (bdyPts.length === 1) {
-           return this._geomFact.createPoint(bdyPts[0])
-         }
-         return this._geomFact.createMultiPointFromCoords(bdyPts)
-       };
-       BoundaryOp.prototype.getBoundary = function getBoundary () {
-         if (this._geom instanceof LineString) { return this.boundaryLineString(this._geom) }
-         if (this._geom instanceof MultiLineString) { return this.boundaryMultiLineString(this._geom) }
-         return this._geom.getBoundary()
+       var uiFields = {
+         access: uiFieldAccess,
+         address: uiFieldAddress,
+         check: uiFieldCheck,
+         combo: uiFieldCombo,
+         cycleway: uiFieldCycleway,
+         defaultCheck: uiFieldCheck,
+         email: uiFieldText,
+         identifier: uiFieldText,
+         lanes: uiFieldLanes,
+         localized: uiFieldLocalized,
+         maxspeed: uiFieldMaxspeed,
+         manyCombo: uiFieldCombo,
+         multiCombo: uiFieldCombo,
+         networkCombo: uiFieldCombo,
+         number: uiFieldText,
+         onewayCheck: uiFieldCheck,
+         radio: uiFieldRadio,
+         restrictions: uiFieldRestrictions,
+         semiCombo: uiFieldCombo,
+         structureRadio: uiFieldRadio,
+         tel: uiFieldText,
+         text: uiFieldText,
+         textarea: uiFieldTextarea,
+         typeCombo: uiFieldCombo,
+         url: uiFieldText,
+         wikidata: uiFieldWikidata,
+         wikipedia: uiFieldWikipedia
        };
-       BoundaryOp.prototype.boundaryLineString = function boundaryLineString (line) {
-         if (this._geom.isEmpty()) {
-           return this.getEmptyMultiPoint()
-         }
-         if (line.isClosed()) {
-           var closedEndpointOnBoundary = this._bnRule.isInBoundary(2);
-           if (closedEndpointOnBoundary) {
-             return line.getStartPoint()
-           } else {
-             return this._geomFact.createMultiPoint()
+
+       function uiField(context, presetField, entityIDs, options) {
+         options = Object.assign({
+           show: true,
+           wrap: true,
+           remove: true,
+           revert: true,
+           info: true
+         }, options);
+         var dispatch$1 = dispatch('change', 'revert');
+         var field = Object.assign({}, presetField); // shallow copy
+
+         field.domId = utilUniqueDomId('form-field-' + field.safeid);
+         var _show = options.show;
+         var _state = '';
+         var _tags = {};
+         var _locked = false;
+
+         var _lockedTip = uiTooltip().title(_t.html('inspector.lock.suggestion', {
+           label: field.label
+         })).placement('bottom');
+
+         field.keys = field.keys || [field.key]; // only create the fields that are actually being shown
+
+         if (_show && !field.impl) {
+           createField();
+         } // Creates the field.. This is done lazily,
+         // once we know that the field will be shown.
+
+
+         function createField() {
+           field.impl = uiFields[field.type](field, context).on('change', function (t, onInput) {
+             dispatch$1.call('change', field, t, onInput);
+           });
+
+           if (entityIDs) {
+             field.entityIDs = entityIDs; // if this field cares about the entities, pass them along
+
+             if (field.impl.entityIDs) {
+               field.impl.entityIDs(entityIDs);
+             }
            }
          }
-         return this._geomFact.createMultiPoint([line.getStartPoint(), line.getEndPoint()])
-       };
-       BoundaryOp.prototype.getEmptyMultiPoint = function getEmptyMultiPoint () {
-         return this._geomFact.createMultiPoint()
-       };
-       BoundaryOp.prototype.computeBoundaryCoordinates = function computeBoundaryCoordinates (mLine) {
-           var this$1 = this;
-
-         var bdyPts = new ArrayList();
-         this._endpointMap = new TreeMap();
-         for (var i = 0; i < mLine.getNumGeometries(); i++) {
-           var line = mLine.getGeometryN(i);
-           if (line.getNumPoints() === 0) { continue }
-           this$1.addEndpoint(line.getCoordinateN(0));
-           this$1.addEndpoint(line.getCoordinateN(line.getNumPoints() - 1));
-         }
-         for (var it = this._endpointMap.entrySet().iterator(); it.hasNext();) {
-           var entry = it.next();
-           var counter = entry.getValue();
-           var valence = counter.count;
-           if (this$1._bnRule.isInBoundary(valence)) {
-             bdyPts.add(entry.getKey());
-           }
-         }
-         return CoordinateArrays.toCoordinateArray(bdyPts)
-       };
-       BoundaryOp.prototype.addEndpoint = function addEndpoint (pt) {
-         var counter = this._endpointMap.get(pt);
-         if (counter === null) {
-           counter = new Counter();
-           this._endpointMap.put(pt, counter);
-         }
-         counter.count++;
-       };
-       BoundaryOp.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       BoundaryOp.prototype.getClass = function getClass () {
-         return BoundaryOp
-       };
-       BoundaryOp.getBoundary = function getBoundary () {
-         if (arguments.length === 1) {
-           var g = arguments[0];
-           var bop = new BoundaryOp(g);
-           return bop.getBoundary()
-         } else if (arguments.length === 2) {
-           var g$1 = arguments[0];
-           var bnRule = arguments[1];
-           var bop$1 = new BoundaryOp(g$1, bnRule);
-           return bop$1.getBoundary()
+
+         function isModified() {
+           if (!entityIDs || !entityIDs.length) return false;
+           return entityIDs.some(function (entityID) {
+             var original = context.graph().base().entities[entityID];
+             var latest = context.graph().entity(entityID);
+             return field.keys.some(function (key) {
+               return original ? latest.tags[key] !== original.tags[key] : latest.tags[key];
+             });
+           });
          }
-       };
 
-       var Counter = function Counter () {
-         this.count = null;
-       };
-       Counter.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       Counter.prototype.getClass = function getClass () {
-         return Counter
-       };
+         function tagsContainFieldKey() {
+           return field.keys.some(function (key) {
+             if (field.type === 'multiCombo') {
+               for (var tagKey in _tags) {
+                 if (tagKey.indexOf(key) === 0) {
+                   return true;
+                 }
+               }
 
-       // boundary
+               return false;
+             }
 
-       function PrintStream () {}
+             return _tags[key] !== undefined;
+           });
+         }
 
-       function StringReader () {}
+         function revert(d3_event, d) {
+           d3_event.stopPropagation();
+           d3_event.preventDefault();
+           if (!entityIDs || _locked) return;
+           dispatch$1.call('revert', d, d.keys);
+         }
 
-       var DecimalFormat = function DecimalFormat () {};
+         function remove(d3_event, d) {
+           d3_event.stopPropagation();
+           d3_event.preventDefault();
+           if (_locked) return;
+           var t = {};
+           d.keys.forEach(function (key) {
+             t[key] = undefined;
+           });
+           dispatch$1.call('change', d, t);
+         }
 
-       function ByteArrayOutputStream () {}
+         field.render = function (selection) {
+           var container = selection.selectAll('.form-field').data([field]); // Enter
 
-       function IOException () {}
+           var enter = container.enter().append('div').attr('class', function (d) {
+             return 'form-field form-field-' + d.safeid;
+           }).classed('nowrap', !options.wrap);
 
-       function LineNumberReader () {}
+           if (options.wrap) {
+             var labelEnter = enter.append('label').attr('class', 'field-label').attr('for', function (d) {
+               return d.domId;
+             });
+             var textEnter = labelEnter.append('span').attr('class', 'label-text');
+             textEnter.append('span').attr('class', 'label-textvalue').html(function (d) {
+               return d.label();
+             });
+             textEnter.append('span').attr('class', 'label-textannotation');
 
-       var StringUtil = function StringUtil () {};
+             if (options.remove) {
+               labelEnter.append('button').attr('class', 'remove-icon').attr('title', _t('icons.remove')).call(svgIcon('#iD-operation-delete'));
+             }
 
-       var staticAccessors$15 = { NEWLINE: { configurable: true },SIMPLE_ORDINATE_FORMAT: { configurable: true } };
+             if (options.revert) {
+               labelEnter.append('button').attr('class', 'modified-icon').attr('title', _t('icons.undo')).call(svgIcon(_mainLocalizer.textDirection() === 'rtl' ? '#iD-icon-redo' : '#iD-icon-undo'));
+             }
+           } // Update
 
-       StringUtil.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       StringUtil.prototype.getClass = function getClass () {
-         return StringUtil
-       };
-       StringUtil.chars = function chars (c, n) {
-         var ch = new Array(n).fill(null);
-         for (var i = 0; i < n; i++) {
-           ch[i] = c;
-         }
-         return String(ch)
-       };
-       StringUtil.getStackTrace = function getStackTrace () {
-         if (arguments.length === 1) {
-           var t = arguments[0];
-           var os = new ByteArrayOutputStream();
-           var ps = new PrintStream(os);
-           t.printStackTrace(ps);
-           return os.toString()
-         } else if (arguments.length === 2) {
-           var t$1 = arguments[0];
-           var depth = arguments[1];
-           var stackTrace = '';
-           var stringReader = new StringReader(StringUtil.getStackTrace(t$1));
-           var lineNumberReader = new LineNumberReader(stringReader);
-           for (var i = 0; i < depth; i++) {
-             try {
-               stackTrace += lineNumberReader.readLine() + StringUtil.NEWLINE;
-             } catch (e) {
-               if (e instanceof IOException) {
-                 Assert.shouldNeverReachHere();
-               } else { throw e }
-             } finally {}
-           }
-           return stackTrace
-         }
-       };
-       StringUtil.split = function split (s, separator) {
-         var separatorlen = separator.length;
-         var tokenList = new ArrayList();
-         var tmpString = '' + s;
-         var pos = tmpString.indexOf(separator);
-         while (pos >= 0) {
-           var token = tmpString.substring(0, pos);
-           tokenList.add(token);
-           tmpString = tmpString.substring(pos + separatorlen);
-           pos = tmpString.indexOf(separator);
-         }
-         if (tmpString.length > 0) { tokenList.add(tmpString); }
-         var res = new Array(tokenList.size()).fill(null);
-         for (var i = 0; i < res.length; i++) {
-           res[i] = tokenList.get(i);
-         }
-         return res
-       };
-       StringUtil.toString = function toString () {
-         if (arguments.length === 1) {
-           var d = arguments[0];
-           return StringUtil.SIMPLE_ORDINATE_FORMAT.format(d)
-         }
-       };
-       StringUtil.spaces = function spaces (n) {
-         return StringUtil.chars(' ', n)
-       };
-       staticAccessors$15.NEWLINE.get = function () { return System.getProperty('line.separator') };
-       staticAccessors$15.SIMPLE_ORDINATE_FORMAT.get = function () { return new DecimalFormat('0.#') };
 
-       Object.defineProperties( StringUtil, staticAccessors$15 );
+           container = container.merge(enter);
+           container.select('.field-label > .remove-icon') // propagate bound data
+           .on('click', remove);
+           container.select('.field-label > .modified-icon') // propagate bound data
+           .on('click', revert);
+           container.each(function (d) {
+             var selection = select(this);
 
-       var CoordinateSequences = function CoordinateSequences () {};
+             if (!d.impl) {
+               createField();
+             }
 
-       CoordinateSequences.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       CoordinateSequences.prototype.getClass = function getClass () {
-         return CoordinateSequences
-       };
-       CoordinateSequences.copyCoord = function copyCoord (src, srcPos, dest, destPos) {
-         var minDim = Math.min(src.getDimension(), dest.getDimension());
-         for (var dim = 0; dim < minDim; dim++) {
-           dest.setOrdinate(destPos, dim, src.getOrdinate(srcPos, dim));
-         }
-       };
-       CoordinateSequences.isRing = function isRing (seq) {
-         var n = seq.size();
-         if (n === 0) { return true }
-         if (n <= 3) { return false }
-         return seq.getOrdinate(0, CoordinateSequence.X) === seq.getOrdinate(n - 1, CoordinateSequence.X) && seq.getOrdinate(0, CoordinateSequence.Y) === seq.getOrdinate(n - 1, CoordinateSequence.Y)
-       };
-       CoordinateSequences.isEqual = function isEqual (cs1, cs2) {
-         var cs1Size = cs1.size();
-         var cs2Size = cs2.size();
-         if (cs1Size !== cs2Size) { return false }
-         var dim = Math.min(cs1.getDimension(), cs2.getDimension());
-         for (var i = 0; i < cs1Size; i++) {
-           for (var d = 0; d < dim; d++) {
-             var v1 = cs1.getOrdinate(i, d);
-             var v2 = cs2.getOrdinate(i, d);
-             if (cs1.getOrdinate(i, d) === cs2.getOrdinate(i, d)) { continue }
-             if (Double.isNaN(v1) && Double.isNaN(v2)) { continue }
-             return false
-           }
-         }
-         return true
-       };
-       CoordinateSequences.extend = function extend (fact, seq, size) {
-         var newseq = fact.create(size, seq.getDimension());
-         var n = seq.size();
-         CoordinateSequences.copy(seq, 0, newseq, 0, n);
-         if (n > 0) {
-           for (var i = n; i < size; i++) { CoordinateSequences.copy(seq, n - 1, newseq, i, 1); }
-         }
-         return newseq
-       };
-       CoordinateSequences.reverse = function reverse (seq) {
-         var last = seq.size() - 1;
-         var mid = Math.trunc(last / 2);
-         for (var i = 0; i <= mid; i++) {
-           CoordinateSequences.swap(seq, i, last - i);
-         }
-       };
-       CoordinateSequences.swap = function swap (seq, i, j) {
-         if (i === j) { return null }
-         for (var dim = 0; dim < seq.getDimension(); dim++) {
-           var tmp = seq.getOrdinate(i, dim);
-           seq.setOrdinate(i, dim, seq.getOrdinate(j, dim));
-           seq.setOrdinate(j, dim, tmp);
-         }
-       };
-       CoordinateSequences.copy = function copy (src, srcPos, dest, destPos, length) {
-         for (var i = 0; i < length; i++) {
-           CoordinateSequences.copyCoord(src, srcPos + i, dest, destPos + i);
-         }
-       };
-       CoordinateSequences.toString = function toString () {
-         if (arguments.length === 1) {
-           var cs = arguments[0];
-           var size = cs.size();
-           if (size === 0) { return '()' }
-           var dim = cs.getDimension();
-           var buf = new StringBuffer();
-           buf.append('(');
-           for (var i = 0; i < size; i++) {
-             if (i > 0) { buf.append(' '); }
-             for (var d = 0; d < dim; d++) {
-               if (d > 0) { buf.append(','); }
-               buf.append(StringUtil.toString(cs.getOrdinate(i, d)));
-             }
-           }
-           buf.append(')');
-           return buf.toString()
-         }
-       };
-       CoordinateSequences.ensureValidRing = function ensureValidRing (fact, seq) {
-         var n = seq.size();
-         if (n === 0) { return seq }
-         if (n <= 3) { return CoordinateSequences.createClosedRing(fact, seq, 4) }
-         var isClosed = seq.getOrdinate(0, CoordinateSequence.X) === seq.getOrdinate(n - 1, CoordinateSequence.X) && seq.getOrdinate(0, CoordinateSequence.Y) === seq.getOrdinate(n - 1, CoordinateSequence.Y);
-         if (isClosed) { return seq }
-         return CoordinateSequences.createClosedRing(fact, seq, n + 1)
-       };
-       CoordinateSequences.createClosedRing = function createClosedRing (fact, seq, size) {
-         var newseq = fact.create(size, seq.getDimension());
-         var n = seq.size();
-         CoordinateSequences.copy(seq, 0, newseq, 0, n);
-         for (var i = n; i < size; i++) { CoordinateSequences.copy(seq, 0, newseq, i, 1); }
-         return newseq
-       };
+             var reference, help; // instantiate field help
 
-       var LineString = (function (Geometry$$1) {
-         function LineString (points, factory) {
-           Geometry$$1.call(this, factory);
-           this._points = null;
-           this.init(points);
-         }
+             if (options.wrap && field.type === 'restrictions') {
+               help = uiFieldHelp(context, 'restrictions');
+             } // instantiate tag reference
 
-         if ( Geometry$$1 ) LineString.__proto__ = Geometry$$1;
-         LineString.prototype = Object.create( Geometry$$1 && Geometry$$1.prototype );
-         LineString.prototype.constructor = LineString;
 
-         var staticAccessors = { serialVersionUID: { configurable: true } };
-         LineString.prototype.computeEnvelopeInternal = function computeEnvelopeInternal () {
-           if (this.isEmpty()) {
-             return new Envelope()
-           }
-           return this._points.expandEnvelope(new Envelope())
-         };
-         LineString.prototype.isRing = function isRing () {
-           return this.isClosed() && this.isSimple()
-         };
-         LineString.prototype.getSortIndex = function getSortIndex () {
-           return Geometry$$1.SORTINDEX_LINESTRING
-         };
-         LineString.prototype.getCoordinates = function getCoordinates () {
-           return this._points.toCoordinateArray()
-         };
-         LineString.prototype.equalsExact = function equalsExact () {
-           var this$1 = this;
+             if (options.wrap && options.info) {
+               var referenceKey = d.key || '';
 
-           if (arguments.length === 2) {
-             var other = arguments[0];
-             var tolerance = arguments[1];
-             if (!this.isEquivalentClass(other)) {
-               return false
-             }
-             var otherLineString = other;
-             if (this._points.size() !== otherLineString._points.size()) {
-               return false
-             }
-             for (var i = 0; i < this._points.size(); i++) {
-               if (!this$1.equal(this$1._points.getCoordinate(i), otherLineString._points.getCoordinate(i), tolerance)) {
-                 return false
+               if (d.type === 'multiCombo') {
+                 // lookup key without the trailing ':'
+                 referenceKey = referenceKey.replace(/:$/, '');
                }
-             }
-             return true
-           } else { return Geometry$$1.prototype.equalsExact.apply(this, arguments) }
-         };
-         LineString.prototype.normalize = function normalize () {
-           var this$1 = this;
 
-           for (var i = 0; i < Math.trunc(this._points.size() / 2); i++) {
-             var j = this$1._points.size() - 1 - i;
-             if (!this$1._points.getCoordinate(i).equals(this$1._points.getCoordinate(j))) {
-               if (this$1._points.getCoordinate(i).compareTo(this$1._points.getCoordinate(j)) > 0) {
-                 CoordinateSequences.reverse(this$1._points);
-               }
-               return null
-             }
-           }
-         };
-         LineString.prototype.getCoordinate = function getCoordinate () {
-           if (this.isEmpty()) { return null }
-           return this._points.getCoordinate(0)
-         };
-         LineString.prototype.getBoundaryDimension = function getBoundaryDimension () {
-           if (this.isClosed()) {
-             return Dimension.FALSE
-           }
-           return 0
-         };
-         LineString.prototype.isClosed = function isClosed () {
-           if (this.isEmpty()) {
-             return false
-           }
-           return this.getCoordinateN(0).equals2D(this.getCoordinateN(this.getNumPoints() - 1))
-         };
-         LineString.prototype.getEndPoint = function getEndPoint () {
-           if (this.isEmpty()) {
-             return null
-           }
-           return this.getPointN(this.getNumPoints() - 1)
-         };
-         LineString.prototype.getDimension = function getDimension () {
-           return 1
-         };
-         LineString.prototype.getLength = function getLength () {
-           return CGAlgorithms.computeLength(this._points)
-         };
-         LineString.prototype.getNumPoints = function getNumPoints () {
-           return this._points.size()
-         };
-         LineString.prototype.reverse = function reverse () {
-           var seq = this._points.copy();
-           CoordinateSequences.reverse(seq);
-           var revLine = this.getFactory().createLineString(seq);
-           return revLine
-         };
-         LineString.prototype.compareToSameClass = function compareToSameClass () {
-           var this$1 = this;
+               reference = uiTagReference(d.reference || {
+                 key: referenceKey
+               });
 
-           if (arguments.length === 1) {
-             var o = arguments[0];
-             var line = o;
-             var i = 0;
-             var j = 0;
-             while (i < this._points.size() && j < line._points.size()) {
-               var comparison = this$1._points.getCoordinate(i).compareTo(line._points.getCoordinate(j));
-               if (comparison !== 0) {
-                 return comparison
+               if (_state === 'hover') {
+                 reference.showing(false);
                }
-               i++;
-               j++;
              }
-             if (i < this._points.size()) {
-               return 1
-             }
-             if (j < line._points.size()) {
-               return -1
-             }
-             return 0
-           } else if (arguments.length === 2) {
-             var o$1 = arguments[0];
-             var comp = arguments[1];
-             var line$1 = o$1;
-             return comp.compare(this._points, line$1._points)
-           }
-         };
-         LineString.prototype.apply = function apply () {
-           var this$1 = this;
 
-           if (hasInterface(arguments[0], CoordinateFilter)) {
-             var filter = arguments[0];
-             for (var i = 0; i < this._points.size(); i++) {
-               filter.filter(this$1._points.getCoordinate(i));
-             }
-           } else if (hasInterface(arguments[0], CoordinateSequenceFilter)) {
-             var filter$1 = arguments[0];
-             if (this._points.size() === 0) { return null }
-             for (var i$1 = 0; i$1 < this._points.size(); i$1++) {
-               filter$1.filter(this$1._points, i$1);
-               if (filter$1.isDone()) { break }
-             }
-             if (filter$1.isGeometryChanged()) { this.geometryChanged(); }
-           } else if (hasInterface(arguments[0], GeometryFilter)) {
-             var filter$2 = arguments[0];
-             filter$2.filter(this);
-           } else if (hasInterface(arguments[0], GeometryComponentFilter)) {
-             var filter$3 = arguments[0];
-             filter$3.filter(this);
-           }
-         };
-         LineString.prototype.getBoundary = function getBoundary () {
-           return new BoundaryOp(this).getBoundary()
-         };
-         LineString.prototype.isEquivalentClass = function isEquivalentClass (other) {
-           return other instanceof LineString
-         };
-         LineString.prototype.clone = function clone () {
-           var ls = Geometry$$1.prototype.clone.call(this);
-           ls._points = this._points.clone();
-           return ls
-         };
-         LineString.prototype.getCoordinateN = function getCoordinateN (n) {
-           return this._points.getCoordinate(n)
-         };
-         LineString.prototype.getGeometryType = function getGeometryType () {
-           return 'LineString'
-         };
-         LineString.prototype.copy = function copy () {
-           return new LineString(this._points.copy(), this._factory)
-         };
-         LineString.prototype.getCoordinateSequence = function getCoordinateSequence () {
-           return this._points
-         };
-         LineString.prototype.isEmpty = function isEmpty () {
-           return this._points.size() === 0
-         };
-         LineString.prototype.init = function init (points) {
-           if (points === null) {
-             points = this.getFactory().getCoordinateSequenceFactory().create([]);
-           }
-           if (points.size() === 1) {
-             throw new IllegalArgumentException('Invalid number of points in LineString (found ' + points.size() + ' - must be 0 or >= 2)')
-           }
-           this._points = points;
-         };
-         LineString.prototype.isCoordinate = function isCoordinate (pt) {
-           var this$1 = this;
+             selection.call(d.impl); // add field help components
 
-           for (var i = 0; i < this._points.size(); i++) {
-             if (this$1._points.getCoordinate(i).equals(pt)) {
-               return true
-             }
-           }
-           return false
-         };
-         LineString.prototype.getStartPoint = function getStartPoint () {
-           if (this.isEmpty()) {
-             return null
-           }
-           return this.getPointN(0)
-         };
-         LineString.prototype.getPointN = function getPointN (n) {
-           return this.getFactory().createPoint(this._points.getCoordinate(n))
-         };
-         LineString.prototype.interfaces_ = function interfaces_ () {
-           return [Lineal]
-         };
-         LineString.prototype.getClass = function getClass () {
-           return LineString
-         };
-         staticAccessors.serialVersionUID.get = function () { return 3110669828065365560 };
+             if (help) {
+               selection.call(help.body).select('.field-label').call(help.button);
+             } // add tag reference components
 
-         Object.defineProperties( LineString, staticAccessors );
 
-         return LineString;
-       }(Geometry));
+             if (reference) {
+               selection.call(reference.body).select('.field-label').call(reference.button);
+             }
 
-       var Puntal = function Puntal () {};
+             d.impl.tags(_tags);
+           });
+           container.classed('locked', _locked).classed('modified', isModified()).classed('present', tagsContainFieldKey()); // show a tip and lock icon if the field is locked
 
-       Puntal.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       Puntal.prototype.getClass = function getClass () {
-         return Puntal
-       };
+           var annotation = container.selectAll('.field-label .label-textannotation');
+           var icon = annotation.selectAll('.icon').data(_locked ? [0] : []);
+           icon.exit().remove();
+           icon.enter().append('svg').attr('class', 'icon').append('use').attr('xlink:href', '#fas-lock');
+           container.call(_locked ? _lockedTip : _lockedTip.destroy);
+         };
 
-       var Point$1 = (function (Geometry$$1) {
-         function Point (coordinates, factory) {
-           Geometry$$1.call(this, factory);
-           this._coordinates = coordinates || null;
-           this.init(this._coordinates);
-         }
+         field.state = function (val) {
+           if (!arguments.length) return _state;
+           _state = val;
+           return field;
+         };
 
-         if ( Geometry$$1 ) Point.__proto__ = Geometry$$1;
-         Point.prototype = Object.create( Geometry$$1 && Geometry$$1.prototype );
-         Point.prototype.constructor = Point;
+         field.tags = function (val) {
+           if (!arguments.length) return _tags;
+           _tags = val;
 
-         var staticAccessors = { serialVersionUID: { configurable: true } };
-         Point.prototype.computeEnvelopeInternal = function computeEnvelopeInternal () {
-           if (this.isEmpty()) {
-             return new Envelope()
-           }
-           var env = new Envelope();
-           env.expandToInclude(this._coordinates.getX(0), this._coordinates.getY(0));
-           return env
-         };
-         Point.prototype.getSortIndex = function getSortIndex () {
-           return Geometry$$1.SORTINDEX_POINT
-         };
-         Point.prototype.getCoordinates = function getCoordinates () {
-           return this.isEmpty() ? [] : [this.getCoordinate()]
-         };
-         Point.prototype.equalsExact = function equalsExact () {
-           if (arguments.length === 2) {
-             var other = arguments[0];
-             var tolerance = arguments[1];
-             if (!this.isEquivalentClass(other)) {
-               return false
-             }
-             if (this.isEmpty() && other.isEmpty()) {
-               return true
-             }
-             if (this.isEmpty() !== other.isEmpty()) {
-               return false
-             }
-             return this.equal(other.getCoordinate(), this.getCoordinate(), tolerance)
-           } else { return Geometry$$1.prototype.equalsExact.apply(this, arguments) }
-         };
-         Point.prototype.normalize = function normalize () {};
-         Point.prototype.getCoordinate = function getCoordinate () {
-           return this._coordinates.size() !== 0 ? this._coordinates.getCoordinate(0) : null
-         };
-         Point.prototype.getBoundaryDimension = function getBoundaryDimension () {
-           return Dimension.FALSE
-         };
-         Point.prototype.getDimension = function getDimension () {
-           return 0
-         };
-         Point.prototype.getNumPoints = function getNumPoints () {
-           return this.isEmpty() ? 0 : 1
-         };
-         Point.prototype.reverse = function reverse () {
-           return this.copy()
-         };
-         Point.prototype.getX = function getX () {
-           if (this.getCoordinate() === null) {
-             throw new Error('getX called on empty Point')
-           }
-           return this.getCoordinate().x
-         };
-         Point.prototype.compareToSameClass = function compareToSameClass () {
-           if (arguments.length === 1) {
-             var other = arguments[0];
-             var point$1 = other;
-             return this.getCoordinate().compareTo(point$1.getCoordinate())
-           } else if (arguments.length === 2) {
-             var other$1 = arguments[0];
-             var comp = arguments[1];
-             var point = other$1;
-             return comp.compare(this._coordinates, point._coordinates)
-           }
-         };
-         Point.prototype.apply = function apply () {
-           if (hasInterface(arguments[0], CoordinateFilter)) {
-             var filter = arguments[0];
-             if (this.isEmpty()) {
-               return null
+           if (tagsContainFieldKey() && !_show) {
+             // always show a field if it has a value to display
+             _show = true;
+
+             if (!field.impl) {
+               createField();
              }
-             filter.filter(this.getCoordinate());
-           } else if (hasInterface(arguments[0], CoordinateSequenceFilter)) {
-             var filter$1 = arguments[0];
-             if (this.isEmpty()) { return null }
-             filter$1.filter(this._coordinates, 0);
-             if (filter$1.isGeometryChanged()) { this.geometryChanged(); }
-           } else if (hasInterface(arguments[0], GeometryFilter)) {
-             var filter$2 = arguments[0];
-             filter$2.filter(this);
-           } else if (hasInterface(arguments[0], GeometryComponentFilter)) {
-             var filter$3 = arguments[0];
-             filter$3.filter(this);
            }
+
+           return field;
          };
-         Point.prototype.getBoundary = function getBoundary () {
-           return this.getFactory().createGeometryCollection(null)
-         };
-         Point.prototype.clone = function clone () {
-           var p = Geometry$$1.prototype.clone.call(this);
-           p._coordinates = this._coordinates.clone();
-           return p
-         };
-         Point.prototype.getGeometryType = function getGeometryType () {
-           return 'Point'
-         };
-         Point.prototype.copy = function copy () {
-           return new Point(this._coordinates.copy(), this._factory)
-         };
-         Point.prototype.getCoordinateSequence = function getCoordinateSequence () {
-           return this._coordinates
+
+         field.locked = function (val) {
+           if (!arguments.length) return _locked;
+           _locked = val;
+           return field;
          };
-         Point.prototype.getY = function getY () {
-           if (this.getCoordinate() === null) {
-             throw new Error('getY called on empty Point')
+
+         field.show = function () {
+           _show = true;
+
+           if (!field.impl) {
+             createField();
            }
-           return this.getCoordinate().y
-         };
-         Point.prototype.isEmpty = function isEmpty () {
-           return this._coordinates.size() === 0
-         };
-         Point.prototype.init = function init (coordinates) {
-           if (coordinates === null) {
-             coordinates = this.getFactory().getCoordinateSequenceFactory().create([]);
+
+           if (field["default"] && field.key && _tags[field.key] !== field["default"]) {
+             var t = {};
+             t[field.key] = field["default"];
+             dispatch$1.call('change', this, t);
            }
-           Assert.isTrue(coordinates.size() <= 1);
-           this._coordinates = coordinates;
-         };
-         Point.prototype.isSimple = function isSimple () {
-           return true
-         };
-         Point.prototype.interfaces_ = function interfaces_ () {
-           return [Puntal]
-         };
-         Point.prototype.getClass = function getClass () {
-           return Point
-         };
-         staticAccessors.serialVersionUID.get = function () { return 4902022702746614570 };
+         }; // A shown field has a visible UI, a non-shown field is in the 'Add field' dropdown
 
-         Object.defineProperties( Point, staticAccessors );
 
-         return Point;
-       }(Geometry));
+         field.isShown = function () {
+           return _show;
+         }; // An allowed field can appear in the UI or in the 'Add field' dropdown.
+         // A non-allowed field is hidden from the user altogether
 
-       var Polygonal = function Polygonal () {};
 
-       Polygonal.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       Polygonal.prototype.getClass = function getClass () {
-         return Polygonal
-       };
+         field.isAllowed = function () {
+           if (entityIDs && entityIDs.length > 1 && uiFields[field.type].supportsMultiselection === false) return false;
+           if (field.geometry && !entityIDs.every(function (entityID) {
+             return field.matchGeometry(context.graph().geometry(entityID));
+           })) return false;
 
-       var Polygon = (function (Geometry$$1) {
-         function Polygon (shell, holes, factory) {
-           Geometry$$1.call(this, factory);
-           this._shell = null;
-           this._holes = null;
-           if (shell === null) {
-             shell = this.getFactory().createLinearRing();
-           }
-           if (holes === null) {
-             holes = [];
-           }
-           if (Geometry$$1.hasNullElements(holes)) {
-             throw new IllegalArgumentException('holes must not contain null elements')
-           }
-           if (shell.isEmpty() && Geometry$$1.hasNonEmptyElements(holes)) {
-             throw new IllegalArgumentException('shell is empty but holes are not')
-           }
-           this._shell = shell;
-           this._holes = holes;
-         }
+           if (field.countryCodes || field.notCountryCodes) {
+             var extent = combinedEntityExtent();
+             if (!extent) return true;
+             var center = extent.center();
+             var countryCode = iso1A2Code(center);
+             if (!countryCode) return false;
+             countryCode = countryCode.toLowerCase();
 
-         if ( Geometry$$1 ) Polygon.__proto__ = Geometry$$1;
-         Polygon.prototype = Object.create( Geometry$$1 && Geometry$$1.prototype );
-         Polygon.prototype.constructor = Polygon;
+             if (field.countryCodes && field.countryCodes.indexOf(countryCode) === -1) {
+               return false;
+             }
 
-         var staticAccessors = { serialVersionUID: { configurable: true } };
-         Polygon.prototype.computeEnvelopeInternal = function computeEnvelopeInternal () {
-           return this._shell.getEnvelopeInternal()
-         };
-         Polygon.prototype.getSortIndex = function getSortIndex () {
-           return Geometry$$1.SORTINDEX_POLYGON
-         };
-         Polygon.prototype.getCoordinates = function getCoordinates () {
-           var this$1 = this;
-
-           if (this.isEmpty()) {
-             return []
-           }
-           var coordinates = new Array(this.getNumPoints()).fill(null);
-           var k = -1;
-           var shellCoordinates = this._shell.getCoordinates();
-           for (var x = 0; x < shellCoordinates.length; x++) {
-             k++;
-             coordinates[k] = shellCoordinates[x];
-           }
-           for (var i = 0; i < this._holes.length; i++) {
-             var childCoordinates = this$1._holes[i].getCoordinates();
-             for (var j = 0; j < childCoordinates.length; j++) {
-               k++;
-               coordinates[k] = childCoordinates[j];
+             if (field.notCountryCodes && field.notCountryCodes.indexOf(countryCode) !== -1) {
+               return false;
              }
            }
-           return coordinates
-         };
-         Polygon.prototype.getArea = function getArea () {
-           var this$1 = this;
 
-           var area = 0.0;
-           area += Math.abs(CGAlgorithms.signedArea(this._shell.getCoordinateSequence()));
-           for (var i = 0; i < this._holes.length; i++) {
-             area -= Math.abs(CGAlgorithms.signedArea(this$1._holes[i].getCoordinateSequence()));
-           }
-           return area
-         };
-         Polygon.prototype.isRectangle = function isRectangle () {
-           if (this.getNumInteriorRing() !== 0) { return false }
-           if (this._shell === null) { return false }
-           if (this._shell.getNumPoints() !== 5) { return false }
-           var seq = this._shell.getCoordinateSequence();
-           var env = this.getEnvelopeInternal();
-           for (var i = 0; i < 5; i++) {
-             var x = seq.getX(i);
-             if (!(x === env.getMinX() || x === env.getMaxX())) { return false }
-             var y = seq.getY(i);
-             if (!(y === env.getMinY() || y === env.getMaxY())) { return false }
-           }
-           var prevX = seq.getX(0);
-           var prevY = seq.getY(0);
-           for (var i$1 = 1; i$1 <= 4; i$1++) {
-             var x$1 = seq.getX(i$1);
-             var y$1 = seq.getY(i$1);
-             var xChanged = x$1 !== prevX;
-             var yChanged = y$1 !== prevY;
-             if (xChanged === yChanged) { return false }
-             prevX = x$1;
-             prevY = y$1;
-           }
-           return true
-         };
-         Polygon.prototype.equalsExact = function equalsExact () {
-           var this$1 = this;
+           var prerequisiteTag = field.prerequisiteTag;
 
-           if (arguments.length === 2) {
-             var other = arguments[0];
-             var tolerance = arguments[1];
-             if (!this.isEquivalentClass(other)) {
-               return false
-             }
-             var otherPolygon = other;
-             var thisShell = this._shell;
-             var otherPolygonShell = otherPolygon._shell;
-             if (!thisShell.equalsExact(otherPolygonShell, tolerance)) {
-               return false
-             }
-             if (this._holes.length !== otherPolygon._holes.length) {
-               return false
-             }
-             for (var i = 0; i < this._holes.length; i++) {
-               if (!this$1._holes[i].equalsExact(otherPolygon._holes[i], tolerance)) {
-                 return false
-               }
-             }
-             return true
-           } else { return Geometry$$1.prototype.equalsExact.apply(this, arguments) }
-         };
-         Polygon.prototype.normalize = function normalize () {
-           var this$1 = this;
-
-           if (arguments.length === 0) {
-             this.normalize(this._shell, true);
-             for (var i = 0; i < this._holes.length; i++) {
-               this$1.normalize(this$1._holes[i], false);
-             }
-             Arrays.sort(this._holes);
-           } else if (arguments.length === 2) {
-             var ring = arguments[0];
-             var clockwise = arguments[1];
-             if (ring.isEmpty()) {
-               return null
-             }
-             var uniqueCoordinates = new Array(ring.getCoordinates().length - 1).fill(null);
-             System.arraycopy(ring.getCoordinates(), 0, uniqueCoordinates, 0, uniqueCoordinates.length);
-             var minCoordinate = CoordinateArrays.minCoordinate(ring.getCoordinates());
-             CoordinateArrays.scroll(uniqueCoordinates, minCoordinate);
-             System.arraycopy(uniqueCoordinates, 0, ring.getCoordinates(), 0, uniqueCoordinates.length);
-             ring.getCoordinates()[uniqueCoordinates.length] = uniqueCoordinates[0];
-             if (CGAlgorithms.isCCW(ring.getCoordinates()) === clockwise) {
-               CoordinateArrays.reverse(ring.getCoordinates());
-             }
-           }
-         };
-         Polygon.prototype.getCoordinate = function getCoordinate () {
-           return this._shell.getCoordinate()
-         };
-         Polygon.prototype.getNumInteriorRing = function getNumInteriorRing () {
-           return this._holes.length
-         };
-         Polygon.prototype.getBoundaryDimension = function getBoundaryDimension () {
-           return 1
-         };
-         Polygon.prototype.getDimension = function getDimension () {
-           return 2
-         };
-         Polygon.prototype.getLength = function getLength () {
-           var this$1 = this;
-
-           var len = 0.0;
-           len += this._shell.getLength();
-           for (var i = 0; i < this._holes.length; i++) {
-             len += this$1._holes[i].getLength();
-           }
-           return len
-         };
-         Polygon.prototype.getNumPoints = function getNumPoints () {
-           var this$1 = this;
-
-           var numPoints = this._shell.getNumPoints();
-           for (var i = 0; i < this._holes.length; i++) {
-             numPoints += this$1._holes[i].getNumPoints();
-           }
-           return numPoints
-         };
-         Polygon.prototype.reverse = function reverse () {
-           var this$1 = this;
-
-           var poly = this.copy();
-           poly._shell = this._shell.copy().reverse();
-           poly._holes = new Array(this._holes.length).fill(null);
-           for (var i = 0; i < this._holes.length; i++) {
-             poly._holes[i] = this$1._holes[i].copy().reverse();
-           }
-           return poly
-         };
-         Polygon.prototype.convexHull = function convexHull () {
-           return this.getExteriorRing().convexHull()
-         };
-         Polygon.prototype.compareToSameClass = function compareToSameClass () {
-           var this$1 = this;
+           if (entityIDs && !tagsContainFieldKey() && // ignore tagging prerequisites if a value is already present
+           prerequisiteTag) {
+             if (!entityIDs.every(function (entityID) {
+               var entity = context.graph().entity(entityID);
 
-           if (arguments.length === 1) {
-             var o = arguments[0];
-             var thisShell = this._shell;
-             var otherShell = o._shell;
-             return thisShell.compareToSameClass(otherShell)
-           } else if (arguments.length === 2) {
-             var o$1 = arguments[0];
-             var comp = arguments[1];
-             var poly = o$1;
-             var thisShell$1 = this._shell;
-             var otherShell$1 = poly._shell;
-             var shellComp = thisShell$1.compareToSameClass(otherShell$1, comp);
-             if (shellComp !== 0) { return shellComp }
-             var nHole1 = this.getNumInteriorRing();
-             var nHole2 = poly.getNumInteriorRing();
-             var i = 0;
-             while (i < nHole1 && i < nHole2) {
-               var thisHole = this$1.getInteriorRingN(i);
-               var otherHole = poly.getInteriorRingN(i);
-               var holeComp = thisHole.compareToSameClass(otherHole, comp);
-               if (holeComp !== 0) { return holeComp }
-               i++;
-             }
-             if (i < nHole1) { return 1 }
-             if (i < nHole2) { return -1 }
-             return 0
-           }
-         };
-         Polygon.prototype.apply = function apply (filter) {
-           var this$1 = this;
+               if (prerequisiteTag.key) {
+                 var value = entity.tags[prerequisiteTag.key];
+                 if (!value) return false;
 
-           if (hasInterface(filter, CoordinateFilter)) {
-             this._shell.apply(filter);
-             for (var i$1 = 0; i$1 < this._holes.length; i$1++) {
-               this$1._holes[i$1].apply(filter);
-             }
-           } else if (hasInterface(filter, CoordinateSequenceFilter)) {
-             this._shell.apply(filter);
-             if (!filter.isDone()) {
-               for (var i$2 = 0; i$2 < this._holes.length; i$2++) {
-                 this$1._holes[i$2].apply(filter);
-                 if (filter.isDone()) { break }
+                 if (prerequisiteTag.valueNot) {
+                   return prerequisiteTag.valueNot !== value;
+                 }
+
+                 if (prerequisiteTag.value) {
+                   return prerequisiteTag.value === value;
+                 }
+               } else if (prerequisiteTag.keyNot) {
+                 if (entity.tags[prerequisiteTag.keyNot]) return false;
                }
-             }
-             if (filter.isGeometryChanged()) { this.geometryChanged(); }
-           } else if (hasInterface(filter, GeometryFilter)) {
-             filter.filter(this);
-           } else if (hasInterface(filter, GeometryComponentFilter)) {
-             filter.filter(this);
-             this._shell.apply(filter);
-             for (var i = 0; i < this._holes.length; i++) {
-               this$1._holes[i].apply(filter);
-             }
-           }
-         };
-         Polygon.prototype.getBoundary = function getBoundary () {
-           var this$1 = this;
 
-           if (this.isEmpty()) {
-             return this.getFactory().createMultiLineString()
-           }
-           var rings = new Array(this._holes.length + 1).fill(null);
-           rings[0] = this._shell;
-           for (var i = 0; i < this._holes.length; i++) {
-             rings[i + 1] = this$1._holes[i];
+               return true;
+             })) return false;
            }
-           if (rings.length <= 1) { return this.getFactory().createLinearRing(rings[0].getCoordinateSequence()) }
-           return this.getFactory().createMultiLineString(rings)
-         };
-         Polygon.prototype.clone = function clone () {
-           var this$1 = this;
 
-           var poly = Geometry$$1.prototype.clone.call(this);
-           poly._shell = this._shell.clone();
-           poly._holes = new Array(this._holes.length).fill(null);
-           for (var i = 0; i < this._holes.length; i++) {
-             poly._holes[i] = this$1._holes[i].clone();
-           }
-           return poly
-         };
-         Polygon.prototype.getGeometryType = function getGeometryType () {
-           return 'Polygon'
+           return true;
          };
-         Polygon.prototype.copy = function copy () {
-           var this$1 = this;
 
-           var shell = this._shell.copy();
-           var holes = new Array(this._holes.length).fill(null);
-           for (var i = 0; i < holes.length; i++) {
-             holes[i] = this$1._holes[i].copy();
+         field.focus = function () {
+           if (field.impl) {
+             field.impl.focus();
            }
-           return new Polygon(shell, holes, this._factory)
-         };
-         Polygon.prototype.getExteriorRing = function getExteriorRing () {
-           return this._shell
          };
-         Polygon.prototype.isEmpty = function isEmpty () {
-           return this._shell.isEmpty()
-         };
-         Polygon.prototype.getInteriorRingN = function getInteriorRingN (n) {
-           return this._holes[n]
-         };
-         Polygon.prototype.interfaces_ = function interfaces_ () {
-           return [Polygonal]
-         };
-         Polygon.prototype.getClass = function getClass () {
-           return Polygon
-         };
-         staticAccessors.serialVersionUID.get = function () { return -3494792200821764533 };
 
-         Object.defineProperties( Polygon, staticAccessors );
+         function combinedEntityExtent() {
+           return entityIDs && entityIDs.length && entityIDs.reduce(function (extent, entityID) {
+             var entity = context.graph().entity(entityID);
+             return extent.extend(entity.extent(context.graph()));
+           }, geoExtent());
+         }
 
-         return Polygon;
-       }(Geometry));
+         return utilRebind(field, dispatch$1, 'on');
+       }
 
-       var MultiPoint = (function (GeometryCollection$$1) {
-         function MultiPoint () {
-           GeometryCollection$$1.apply(this, arguments);
-         }
+       function uiFormFields(context) {
+         var moreCombo = uiCombobox(context, 'more-fields').minItems(1);
+         var _fieldsArr = [];
+         var _lastPlaceholder = '';
+         var _state = '';
+         var _klass = '';
+
+         function formFields(selection) {
+           var allowedFields = _fieldsArr.filter(function (field) {
+             return field.isAllowed();
+           });
 
-         if ( GeometryCollection$$1 ) MultiPoint.__proto__ = GeometryCollection$$1;
-         MultiPoint.prototype = Object.create( GeometryCollection$$1 && GeometryCollection$$1.prototype );
-         MultiPoint.prototype.constructor = MultiPoint;
+           var shown = allowedFields.filter(function (field) {
+             return field.isShown();
+           });
+           var notShown = allowedFields.filter(function (field) {
+             return !field.isShown();
+           });
+           var container = selection.selectAll('.form-fields-container').data([0]);
+           container = container.enter().append('div').attr('class', 'form-fields-container ' + (_klass || '')).merge(container);
+           var fields = container.selectAll('.wrap-form-field').data(shown, function (d) {
+             return d.id + (d.entityIDs ? d.entityIDs.join() : '');
+           });
+           fields.exit().remove(); // Enter
 
-         var staticAccessors = { serialVersionUID: { configurable: true } };
+           var enter = fields.enter().append('div').attr('class', function (d) {
+             return 'wrap-form-field wrap-form-field-' + d.safeid;
+           }); // Update
 
-         MultiPoint.prototype.getSortIndex = function getSortIndex () {
-           return Geometry.SORTINDEX_MULTIPOINT
-         };
-         MultiPoint.prototype.isValid = function isValid () {
-           return true
-         };
-         MultiPoint.prototype.equalsExact = function equalsExact () {
-           if (arguments.length === 2) {
-             var other = arguments[0];
-             var tolerance = arguments[1];
-             if (!this.isEquivalentClass(other)) {
-               return false
-             }
-             return GeometryCollection$$1.prototype.equalsExact.call(this, other, tolerance)
-           } else { return GeometryCollection$$1.prototype.equalsExact.apply(this, arguments) }
-         };
-         MultiPoint.prototype.getCoordinate = function getCoordinate () {
-           if (arguments.length === 1) {
-             var n = arguments[0];
-             return this._geometries[n].getCoordinate()
-           } else { return GeometryCollection$$1.prototype.getCoordinate.apply(this, arguments) }
-         };
-         MultiPoint.prototype.getBoundaryDimension = function getBoundaryDimension () {
-           return Dimension.FALSE
-         };
-         MultiPoint.prototype.getDimension = function getDimension () {
-           return 0
-         };
-         MultiPoint.prototype.getBoundary = function getBoundary () {
-           return this.getFactory().createGeometryCollection(null)
-         };
-         MultiPoint.prototype.getGeometryType = function getGeometryType () {
-           return 'MultiPoint'
+           fields = fields.merge(enter);
+           fields.order().each(function (d) {
+             select(this).call(d.render);
+           });
+           var titles = [];
+           var moreFields = notShown.map(function (field) {
+             var title = field.title();
+             titles.push(title);
+             var terms = field.terms();
+             if (field.key) terms.push(field.key);
+             if (field.keys) terms = terms.concat(field.keys);
+             return {
+               display: field.label(),
+               value: title,
+               title: title,
+               field: field,
+               terms: terms
+             };
+           });
+           var placeholder = titles.slice(0, 3).join(', ') + (titles.length > 3 ? '…' : '');
+           var more = selection.selectAll('.more-fields').data(_state === 'hover' || moreFields.length === 0 ? [] : [0]);
+           more.exit().remove();
+           var moreEnter = more.enter().append('div').attr('class', 'more-fields').append('label');
+           moreEnter.append('span').html(_t.html('inspector.add_fields'));
+           more = moreEnter.merge(more);
+           var input = more.selectAll('.value').data([0]);
+           input.exit().remove();
+           input = input.enter().append('input').attr('class', 'value').attr('type', 'text').attr('placeholder', placeholder).call(utilNoAuto).merge(input);
+           input.call(utilGetSetValue, '').call(moreCombo.data(moreFields).on('accept', function (d) {
+             if (!d) return; // user entered something that was not matched
+
+             var field = d.field;
+             field.show();
+             selection.call(formFields); // rerender
+
+             field.focus();
+           })); // avoid updating placeholder excessively (triggers style recalc)
+
+           if (_lastPlaceholder !== placeholder) {
+             input.attr('placeholder', placeholder);
+             _lastPlaceholder = placeholder;
+           }
+         }
+
+         formFields.fieldsArr = function (val) {
+           if (!arguments.length) return _fieldsArr;
+           _fieldsArr = val || [];
+           return formFields;
          };
-         MultiPoint.prototype.copy = function copy () {
-           var this$1 = this;
 
-           var points = new Array(this._geometries.length).fill(null);
-           for (var i = 0; i < points.length; i++) {
-             points[i] = this$1._geometries[i].copy();
-           }
-           return new MultiPoint(points, this._factory)
-         };
-         MultiPoint.prototype.interfaces_ = function interfaces_ () {
-           return [Puntal]
+         formFields.state = function (val) {
+           if (!arguments.length) return _state;
+           _state = val;
+           return formFields;
          };
-         MultiPoint.prototype.getClass = function getClass () {
-           return MultiPoint
+
+         formFields.klass = function (val) {
+           if (!arguments.length) return _klass;
+           _klass = val;
+           return formFields;
          };
-         staticAccessors.serialVersionUID.get = function () { return -8048474874175355449 };
 
-         Object.defineProperties( MultiPoint, staticAccessors );
+         return formFields;
+       }
 
-         return MultiPoint;
-       }(GeometryCollection));
+       function uiSectionPresetFields(context) {
+         var section = uiSection('preset-fields', context).label(_t.html('inspector.fields')).disclosureContent(renderDisclosureContent);
+         var dispatch$1 = dispatch('change', 'revert');
+         var formFields = uiFormFields(context);
 
-       var LinearRing = (function (LineString$$1) {
-         function LinearRing (points, factory) {
-           if (points instanceof Coordinate && factory instanceof GeometryFactory) {
-             points = factory.getCoordinateSequenceFactory().create(points);
-           }
-           LineString$$1.call(this, points, factory);
-           this.validateConstruction();
-         }
+         var _state;
 
-         if ( LineString$$1 ) LinearRing.__proto__ = LineString$$1;
-         LinearRing.prototype = Object.create( LineString$$1 && LineString$$1.prototype );
-         LinearRing.prototype.constructor = LinearRing;
+         var _fieldsArr;
 
-         var staticAccessors = { MINIMUM_VALID_SIZE: { configurable: true },serialVersionUID: { configurable: true } };
-         LinearRing.prototype.getSortIndex = function getSortIndex () {
-           return Geometry.SORTINDEX_LINEARRING
-         };
-         LinearRing.prototype.getBoundaryDimension = function getBoundaryDimension () {
-           return Dimension.FALSE
-         };
-         LinearRing.prototype.isClosed = function isClosed () {
-           if (this.isEmpty()) {
-             return true
-           }
-           return LineString$$1.prototype.isClosed.call(this)
-         };
-         LinearRing.prototype.reverse = function reverse () {
-           var seq = this._points.copy();
-           CoordinateSequences.reverse(seq);
-           var rev = this.getFactory().createLinearRing(seq);
-           return rev
-         };
-         LinearRing.prototype.validateConstruction = function validateConstruction () {
-           if (!this.isEmpty() && !LineString$$1.prototype.isClosed.call(this)) {
-             throw new IllegalArgumentException('Points of LinearRing do not form a closed linestring')
-           }
-           if (this.getCoordinateSequence().size() >= 1 && this.getCoordinateSequence().size() < LinearRing.MINIMUM_VALID_SIZE) {
-             throw new IllegalArgumentException('Invalid number of points in LinearRing (found ' + this.getCoordinateSequence().size() + ' - must be 0 or >= 4)')
-           }
-         };
-         LinearRing.prototype.getGeometryType = function getGeometryType () {
-           return 'LinearRing'
-         };
-         LinearRing.prototype.copy = function copy () {
-           return new LinearRing(this._points.copy(), this._factory)
-         };
-         LinearRing.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         LinearRing.prototype.getClass = function getClass () {
-           return LinearRing
-         };
-         staticAccessors.MINIMUM_VALID_SIZE.get = function () { return 4 };
-         staticAccessors.serialVersionUID.get = function () { return -4261142084085851829 };
+         var _presets = [];
 
-         Object.defineProperties( LinearRing, staticAccessors );
+         var _tags;
 
-         return LinearRing;
-       }(LineString));
+         var _entityIDs;
 
-       var MultiPolygon = (function (GeometryCollection$$1) {
-         function MultiPolygon () {
-           GeometryCollection$$1.apply(this, arguments);
-         }
+         function renderDisclosureContent(selection) {
+           if (!_fieldsArr) {
+             var graph = context.graph();
+             var geometries = Object.keys(_entityIDs.reduce(function (geoms, entityID) {
+               geoms[graph.entity(entityID).geometry(graph)] = true;
+               return geoms;
+             }, {}));
+             var presetsManager = _mainPresetIndex;
+             var allFields = [];
+             var allMoreFields = [];
+             var sharedTotalFields;
 
-         if ( GeometryCollection$$1 ) MultiPolygon.__proto__ = GeometryCollection$$1;
-         MultiPolygon.prototype = Object.create( GeometryCollection$$1 && GeometryCollection$$1.prototype );
-         MultiPolygon.prototype.constructor = MultiPolygon;
+             _presets.forEach(function (preset) {
+               var fields = preset.fields();
+               var moreFields = preset.moreFields();
+               allFields = utilArrayUnion(allFields, fields);
+               allMoreFields = utilArrayUnion(allMoreFields, moreFields);
 
-         var staticAccessors = { serialVersionUID: { configurable: true } };
+               if (!sharedTotalFields) {
+                 sharedTotalFields = utilArrayUnion(fields, moreFields);
+               } else {
+                 sharedTotalFields = sharedTotalFields.filter(function (field) {
+                   return fields.indexOf(field) !== -1 || moreFields.indexOf(field) !== -1;
+                 });
+               }
+             });
 
-         MultiPolygon.prototype.getSortIndex = function getSortIndex () {
-           return Geometry.SORTINDEX_MULTIPOLYGON
-         };
-         MultiPolygon.prototype.equalsExact = function equalsExact () {
-           if (arguments.length === 2) {
-             var other = arguments[0];
-             var tolerance = arguments[1];
-             if (!this.isEquivalentClass(other)) {
-               return false
+             var sharedFields = allFields.filter(function (field) {
+               return sharedTotalFields.indexOf(field) !== -1;
+             });
+             var sharedMoreFields = allMoreFields.filter(function (field) {
+               return sharedTotalFields.indexOf(field) !== -1;
+             });
+             _fieldsArr = [];
+             sharedFields.forEach(function (field) {
+               if (field.matchAllGeometry(geometries)) {
+                 _fieldsArr.push(uiField(context, field, _entityIDs));
+               }
+             });
+             var singularEntity = _entityIDs.length === 1 && graph.hasEntity(_entityIDs[0]);
+
+             if (singularEntity && singularEntity.isHighwayIntersection(graph) && presetsManager.field('restrictions')) {
+               _fieldsArr.push(uiField(context, presetsManager.field('restrictions'), _entityIDs));
              }
-             return GeometryCollection$$1.prototype.equalsExact.call(this, other, tolerance)
-           } else { return GeometryCollection$$1.prototype.equalsExact.apply(this, arguments) }
-         };
-         MultiPolygon.prototype.getBoundaryDimension = function getBoundaryDimension () {
-           return 1
-         };
-         MultiPolygon.prototype.getDimension = function getDimension () {
-           return 2
-         };
-         MultiPolygon.prototype.reverse = function reverse () {
-           var this$1 = this;
 
-           var n = this._geometries.length;
-           var revGeoms = new Array(n).fill(null);
-           for (var i = 0; i < this._geometries.length; i++) {
-             revGeoms[i] = this$1._geometries[i].reverse();
-           }
-           return this.getFactory().createMultiPolygon(revGeoms)
-         };
-         MultiPolygon.prototype.getBoundary = function getBoundary () {
-           var this$1 = this;
+             var additionalFields = utilArrayUnion(sharedMoreFields, presetsManager.universal());
+             additionalFields.sort(function (field1, field2) {
+               return field1.label().localeCompare(field2.label(), _mainLocalizer.localeCode());
+             });
+             additionalFields.forEach(function (field) {
+               if (sharedFields.indexOf(field) === -1 && field.matchAllGeometry(geometries)) {
+                 _fieldsArr.push(uiField(context, field, _entityIDs, {
+                   show: false
+                 }));
+               }
+             });
 
-           if (this.isEmpty()) {
-             return this.getFactory().createMultiLineString()
+             _fieldsArr.forEach(function (field) {
+               field.on('change', function (t, onInput) {
+                 dispatch$1.call('change', field, _entityIDs, t, onInput);
+               }).on('revert', function (keys) {
+                 dispatch$1.call('revert', field, keys);
+               });
+             });
            }
-           var allRings = new ArrayList();
-           for (var i = 0; i < this._geometries.length; i++) {
-             var polygon = this$1._geometries[i];
-             var rings = polygon.getBoundary();
-             for (var j = 0; j < rings.getNumGeometries(); j++) {
-               allRings.add(rings.getGeometryN(j));
+
+           _fieldsArr.forEach(function (field) {
+             field.state(_state).tags(_tags);
+           });
+
+           selection.call(formFields.fieldsArr(_fieldsArr).state(_state).klass('grouped-items-area'));
+           selection.selectAll('.wrap-form-field input').on('keydown', function (d3_event) {
+             // if user presses enter, and combobox is not active, accept edits..
+             if (d3_event.keyCode === 13 && // ↩ Return
+             context.container().select('.combobox').empty()) {
+               context.enter(modeBrowse(context));
              }
+           });
+         }
+
+         section.presets = function (val) {
+           if (!arguments.length) return _presets;
+
+           if (!_presets || !val || !utilArrayIdentical(_presets, val)) {
+             _presets = val;
+             _fieldsArr = null;
            }
-           var allRingsArray = new Array(allRings.size()).fill(null);
-           return this.getFactory().createMultiLineString(allRings.toArray(allRingsArray))
-         };
-         MultiPolygon.prototype.getGeometryType = function getGeometryType () {
-           return 'MultiPolygon'
+
+           return section;
          };
-         MultiPolygon.prototype.copy = function copy () {
-           var this$1 = this;
 
-           var polygons = new Array(this._geometries.length).fill(null);
-           for (var i = 0; i < polygons.length; i++) {
-             polygons[i] = this$1._geometries[i].copy();
-           }
-           return new MultiPolygon(polygons, this._factory)
+         section.state = function (val) {
+           if (!arguments.length) return _state;
+           _state = val;
+           return section;
          };
-         MultiPolygon.prototype.interfaces_ = function interfaces_ () {
-           return [Polygonal]
+
+         section.tags = function (val) {
+           if (!arguments.length) return _tags;
+           _tags = val; // Don't reset _fieldsArr here.
+
+           return section;
          };
-         MultiPolygon.prototype.getClass = function getClass () {
-           return MultiPolygon
+
+         section.entityIDs = function (val) {
+           if (!arguments.length) return _entityIDs;
+
+           if (!val || !_entityIDs || !utilArrayIdentical(_entityIDs, val)) {
+             _entityIDs = val;
+             _fieldsArr = null;
+           }
+
+           return section;
          };
-         staticAccessors.serialVersionUID.get = function () { return -551033529766975875 };
 
-         Object.defineProperties( MultiPolygon, staticAccessors );
+         return utilRebind(section, dispatch$1, 'on');
+       }
 
-         return MultiPolygon;
-       }(GeometryCollection));
+       function uiSectionRawMemberEditor(context) {
+         var section = uiSection('raw-member-editor', context).shouldDisplay(function () {
+           if (!_entityIDs || _entityIDs.length !== 1) return false;
+           var entity = context.hasEntity(_entityIDs[0]);
+           return entity && entity.type === 'relation';
+         }).label(function () {
+           var entity = context.hasEntity(_entityIDs[0]);
+           if (!entity) return '';
+           var gt = entity.members.length > _maxMembers ? '>' : '';
+           var count = gt + entity.members.slice(0, _maxMembers).length;
+           return _t('inspector.title_count', {
+             title: _t.html('inspector.members'),
+             count: count
+           });
+         }).disclosureContent(renderDisclosureContent);
+         var taginfo = services.taginfo;
 
-       var GeometryEditor = function GeometryEditor (factory) {
-         this._factory = factory || null;
-         this._isUserDataCopied = false;
-       };
+         var _entityIDs;
 
-       var staticAccessors$16 = { NoOpGeometryOperation: { configurable: true },CoordinateOperation: { configurable: true },CoordinateSequenceOperation: { configurable: true } };
-       GeometryEditor.prototype.setCopyUserData = function setCopyUserData (isUserDataCopied) {
-         this._isUserDataCopied = isUserDataCopied;
-       };
-       GeometryEditor.prototype.edit = function edit (geometry, operation) {
-         if (geometry === null) { return null }
-         var result = this.editInternal(geometry, operation);
-         if (this._isUserDataCopied) {
-           result.setUserData(geometry.getUserData());
-         }
-         return result
-       };
-       GeometryEditor.prototype.editInternal = function editInternal (geometry, operation) {
-         if (this._factory === null) { this._factory = geometry.getFactory(); }
-         if (geometry instanceof GeometryCollection) {
-           return this.editGeometryCollection(geometry, operation)
-         }
-         if (geometry instanceof Polygon) {
-           return this.editPolygon(geometry, operation)
-         }
-         if (geometry instanceof Point$1) {
-           return operation.edit(geometry, this._factory)
-         }
-         if (geometry instanceof LineString) {
-           return operation.edit(geometry, this._factory)
-         }
-         Assert.shouldNeverReachHere('Unsupported Geometry class: ' + geometry.getClass().getName());
-         return null
-       };
-       GeometryEditor.prototype.editGeometryCollection = function editGeometryCollection (collection, operation) {
-           var this$1 = this;
+         var _maxMembers = 1000;
 
-         var collectionForType = operation.edit(collection, this._factory);
-         var geometries = new ArrayList();
-         for (var i = 0; i < collectionForType.getNumGeometries(); i++) {
-           var geometry = this$1.edit(collectionForType.getGeometryN(i), operation);
-           if (geometry === null || geometry.isEmpty()) {
-             continue
-           }
-           geometries.add(geometry);
-         }
-         if (collectionForType.getClass() === MultiPoint) {
-           return this._factory.createMultiPoint(geometries.toArray([]))
-         }
-         if (collectionForType.getClass() === MultiLineString) {
-           return this._factory.createMultiLineString(geometries.toArray([]))
-         }
-         if (collectionForType.getClass() === MultiPolygon) {
-           return this._factory.createMultiPolygon(geometries.toArray([]))
-         }
-         return this._factory.createGeometryCollection(geometries.toArray([]))
-       };
-       GeometryEditor.prototype.editPolygon = function editPolygon (polygon, operation) {
-           var this$1 = this;
+         function downloadMember(d3_event, d) {
+           d3_event.preventDefault(); // display the loading indicator
 
-         var newPolygon = operation.edit(polygon, this._factory);
-         if (newPolygon === null) { newPolygon = this._factory.createPolygon(null); }
-         if (newPolygon.isEmpty()) {
-           return newPolygon
-         }
-         var shell = this.edit(newPolygon.getExteriorRing(), operation);
-         if (shell === null || shell.isEmpty()) {
-           return this._factory.createPolygon()
-         }
-         var holes = new ArrayList();
-         for (var i = 0; i < newPolygon.getNumInteriorRing(); i++) {
-           var hole = this$1.edit(newPolygon.getInteriorRingN(i), operation);
-           if (hole === null || hole.isEmpty()) {
-             continue
-           }
-           holes.add(hole);
+           select(this.parentNode).classed('tag-reference-loading', true);
+           context.loadEntity(d.id, function () {
+             section.reRender();
+           });
          }
-         return this._factory.createPolygon(shell, holes.toArray([]))
-       };
-       GeometryEditor.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       GeometryEditor.prototype.getClass = function getClass () {
-         return GeometryEditor
-       };
-       GeometryEditor.GeometryEditorOperation = function GeometryEditorOperation () {};
-       staticAccessors$16.NoOpGeometryOperation.get = function () { return NoOpGeometryOperation };
-       staticAccessors$16.CoordinateOperation.get = function () { return CoordinateOperation };
-       staticAccessors$16.CoordinateSequenceOperation.get = function () { return CoordinateSequenceOperation };
 
-       Object.defineProperties( GeometryEditor, staticAccessors$16 );
+         function zoomToMember(d3_event, d) {
+           d3_event.preventDefault();
+           var entity = context.entity(d.id);
+           context.map().zoomToEase(entity); // highlight the feature in case it wasn't previously on-screen
 
-       var NoOpGeometryOperation = function NoOpGeometryOperation () {};
+           utilHighlightEntities([d.id], true, context);
+         }
 
-       NoOpGeometryOperation.prototype.edit = function edit (geometry, factory) {
-         return geometry
-       };
-       NoOpGeometryOperation.prototype.interfaces_ = function interfaces_ () {
-         return [GeometryEditor.GeometryEditorOperation]
-       };
-       NoOpGeometryOperation.prototype.getClass = function getClass () {
-         return NoOpGeometryOperation
-       };
+         function selectMember(d3_event, d) {
+           d3_event.preventDefault(); // remove the hover-highlight styling
 
-       var CoordinateOperation = function CoordinateOperation () {};
+           utilHighlightEntities([d.id], false, context);
+           var entity = context.entity(d.id);
+           var mapExtent = context.map().extent();
 
-       CoordinateOperation.prototype.edit = function edit (geometry, factory) {
-         var coords = this.editCoordinates(geometry.getCoordinates(), geometry);
-         if (coords === null) { return geometry }
-         if (geometry instanceof LinearRing) {
-           return factory.createLinearRing(coords)
-         }
-         if (geometry instanceof LineString) {
-           return factory.createLineString(coords)
-         }
-         if (geometry instanceof Point$1) {
-           if (coords.length > 0) {
-             return factory.createPoint(coords[0])
-           } else {
-             return factory.createPoint()
+           if (!entity.intersects(mapExtent, context.graph())) {
+             // zoom to the entity if its extent is not visible now
+             context.map().zoomToEase(entity);
            }
-         }
-         return geometry
-       };
-       CoordinateOperation.prototype.interfaces_ = function interfaces_ () {
-         return [GeometryEditor.GeometryEditorOperation]
-       };
-       CoordinateOperation.prototype.getClass = function getClass () {
-         return CoordinateOperation
-       };
-
-       var CoordinateSequenceOperation = function CoordinateSequenceOperation () {};
 
-       CoordinateSequenceOperation.prototype.edit = function edit (geometry, factory) {
-         if (geometry instanceof LinearRing) {
-           return factory.createLinearRing(this.edit(geometry.getCoordinateSequence(), geometry))
+           context.enter(modeSelect(context, [d.id]));
          }
-         if (geometry instanceof LineString) {
-           return factory.createLineString(this.edit(geometry.getCoordinateSequence(), geometry))
-         }
-         if (geometry instanceof Point$1) {
-           return factory.createPoint(this.edit(geometry.getCoordinateSequence(), geometry))
-         }
-         return geometry
-       };
-       CoordinateSequenceOperation.prototype.interfaces_ = function interfaces_ () {
-         return [GeometryEditor.GeometryEditorOperation]
-       };
-       CoordinateSequenceOperation.prototype.getClass = function getClass () {
-         return CoordinateSequenceOperation
-       };
 
-       var CoordinateArraySequence = function CoordinateArraySequence () {
-         var this$1 = this;
+         function changeRole(d3_event, d) {
+           var oldRole = d.role;
+           var newRole = context.cleanRelationRole(select(this).property('value'));
 
-         this._dimension = 3;
-         this._coordinates = null;
-         if (arguments.length === 1) {
-           if (arguments[0] instanceof Array) {
-             this._coordinates = arguments[0];
-             this._dimension = 3;
-           } else if (Number.isInteger(arguments[0])) {
-             var size = arguments[0];
-             this._coordinates = new Array(size).fill(null);
-             for (var i = 0; i < size; i++) {
-               this$1._coordinates[i] = new Coordinate();
-             }
-           } else if (hasInterface(arguments[0], CoordinateSequence)) {
-             var coordSeq = arguments[0];
-             if (coordSeq === null) {
-               this._coordinates = new Array(0).fill(null);
-               return null
-             }
-             this._dimension = coordSeq.getDimension();
-             this._coordinates = new Array(coordSeq.size()).fill(null);
-             for (var i$1 = 0; i$1 < this._coordinates.length; i$1++) {
-               this$1._coordinates[i$1] = coordSeq.getCoordinateCopy(i$1);
-             }
-           }
-         } else if (arguments.length === 2) {
-           if (arguments[0] instanceof Array && Number.isInteger(arguments[1])) {
-             var coordinates = arguments[0];
-             var dimension = arguments[1];
-             this._coordinates = coordinates;
-             this._dimension = dimension;
-             if (coordinates === null) { this._coordinates = new Array(0).fill(null); }
-           } else if (Number.isInteger(arguments[0]) && Number.isInteger(arguments[1])) {
-             var size$1 = arguments[0];
-             var dimension$1 = arguments[1];
-             this._coordinates = new Array(size$1).fill(null);
-             this._dimension = dimension$1;
-             for (var i$2 = 0; i$2 < size$1; i$2++) {
-               this$1._coordinates[i$2] = new Coordinate();
-             }
+           if (oldRole !== newRole) {
+             var member = {
+               id: d.id,
+               type: d.type,
+               role: newRole
+             };
+             context.perform(actionChangeMember(d.relation.id, member, d.index), _t('operations.change_role.annotation', {
+               n: 1
+             }));
+             context.validator().validate();
            }
          }
-       };
 
-       var staticAccessors$18 = { serialVersionUID: { configurable: true } };
-       CoordinateArraySequence.prototype.setOrdinate = function setOrdinate (index, ordinateIndex, value) {
-         switch (ordinateIndex) {
-           case CoordinateSequence.X:
-             this._coordinates[index].x = value;
-             break
-           case CoordinateSequence.Y:
-             this._coordinates[index].y = value;
-             break
-           case CoordinateSequence.Z:
-             this._coordinates[index].z = value;
-             break
-           default:
-             throw new IllegalArgumentException('invalid ordinateIndex')
-         }
-       };
-       CoordinateArraySequence.prototype.size = function size () {
-         return this._coordinates.length
-       };
-       CoordinateArraySequence.prototype.getOrdinate = function getOrdinate (index, ordinateIndex) {
-         switch (ordinateIndex) {
-           case CoordinateSequence.X:
-             return this._coordinates[index].x
-           case CoordinateSequence.Y:
-             return this._coordinates[index].y
-           case CoordinateSequence.Z:
-             return this._coordinates[index].z
-         }
-         return Double.NaN
-       };
-       CoordinateArraySequence.prototype.getCoordinate = function getCoordinate () {
-         if (arguments.length === 1) {
-           var i = arguments[0];
-           return this._coordinates[i]
-         } else if (arguments.length === 2) {
-           var index = arguments[0];
-           var coord = arguments[1];
-           coord.x = this._coordinates[index].x;
-           coord.y = this._coordinates[index].y;
-           coord.z = this._coordinates[index].z;
-         }
-       };
-       CoordinateArraySequence.prototype.getCoordinateCopy = function getCoordinateCopy (i) {
-         return new Coordinate(this._coordinates[i])
-       };
-       CoordinateArraySequence.prototype.getDimension = function getDimension () {
-         return this._dimension
-       };
-       CoordinateArraySequence.prototype.getX = function getX (index) {
-         return this._coordinates[index].x
-       };
-       CoordinateArraySequence.prototype.clone = function clone () {
-           var this$1 = this;
+         function deleteMember(d3_event, d) {
+           // remove the hover-highlight styling
+           utilHighlightEntities([d.id], false, context);
+           context.perform(actionDeleteMember(d.relation.id, d.index), _t('operations.delete_member.annotation', {
+             n: 1
+           }));
 
-         var cloneCoordinates = new Array(this.size()).fill(null);
-         for (var i = 0; i < this._coordinates.length; i++) {
-           cloneCoordinates[i] = this$1._coordinates[i].clone();
-         }
-         return new CoordinateArraySequence(cloneCoordinates, this._dimension)
-       };
-       CoordinateArraySequence.prototype.expandEnvelope = function expandEnvelope (env) {
-           var this$1 = this;
+           if (!context.hasEntity(d.relation.id)) {
+             // Removing the last member will also delete the relation.
+             // If this happens we need to exit the selection mode
+             context.enter(modeBrowse(context));
+           } else {
+             // Changing the mode also runs `validate`, but otherwise we need to
+             // rerun it manually
+             context.validator().validate();
+           }
+         }
+
+         function renderDisclosureContent(selection) {
+           var entityID = _entityIDs[0];
+           var memberships = [];
+           var entity = context.entity(entityID);
+           entity.members.slice(0, _maxMembers).forEach(function (member, index) {
+             memberships.push({
+               index: index,
+               id: member.id,
+               type: member.type,
+               role: member.role,
+               relation: entity,
+               member: context.hasEntity(member.id),
+               domId: utilUniqueDomId(entityID + '-member-' + index)
+             });
+           });
+           var list = selection.selectAll('.member-list').data([0]);
+           list = list.enter().append('ul').attr('class', 'member-list').merge(list);
+           var items = list.selectAll('li').data(memberships, function (d) {
+             return osmEntity.key(d.relation) + ',' + d.index + ',' + (d.member ? osmEntity.key(d.member) : 'incomplete');
+           });
+           items.exit().each(unbind).remove();
+           var itemsEnter = items.enter().append('li').attr('class', 'member-row form-field').classed('member-incomplete', function (d) {
+             return !d.member;
+           });
+           itemsEnter.each(function (d) {
+             var item = select(this);
+             var label = item.append('label').attr('class', 'field-label').attr('for', d.domId);
+
+             if (d.member) {
+               // highlight the member feature in the map while hovering on the list item
+               item.on('mouseover', function () {
+                 utilHighlightEntities([d.id], true, context);
+               }).on('mouseout', function () {
+                 utilHighlightEntities([d.id], false, context);
+               });
+               var labelLink = label.append('span').attr('class', 'label-text').append('a').attr('href', '#').on('click', selectMember);
+               labelLink.append('span').attr('class', 'member-entity-type').html(function (d) {
+                 var matched = _mainPresetIndex.match(d.member, context.graph());
+                 return matched && matched.name() || utilDisplayType(d.member.id);
+               });
+               labelLink.append('span').attr('class', 'member-entity-name').html(function (d) {
+                 return utilDisplayName(d.member);
+               });
+               label.append('button').attr('title', _t('icons.remove')).attr('class', 'remove member-delete').call(svgIcon('#iD-operation-delete'));
+               label.append('button').attr('class', 'member-zoom').attr('title', _t('icons.zoom_to')).call(svgIcon('#iD-icon-framed-dot', 'monochrome')).on('click', zoomToMember);
+             } else {
+               var labelText = label.append('span').attr('class', 'label-text');
+               labelText.append('span').attr('class', 'member-entity-type').html(_t.html('inspector.' + d.type, {
+                 id: d.id
+               }));
+               labelText.append('span').attr('class', 'member-entity-name').html(_t.html('inspector.incomplete', {
+                 id: d.id
+               }));
+               label.append('button').attr('class', 'member-download').attr('title', _t('icons.download')).call(svgIcon('#iD-icon-load')).on('click', downloadMember);
+             }
+           });
+           var wrapEnter = itemsEnter.append('div').attr('class', 'form-field-input-wrap form-field-input-member');
+           wrapEnter.append('input').attr('class', 'member-role').attr('id', function (d) {
+             return d.domId;
+           }).property('type', 'text').attr('placeholder', _t('inspector.role')).call(utilNoAuto);
+
+           if (taginfo) {
+             wrapEnter.each(bindTypeahead);
+           } // update
+
+
+           items = items.merge(itemsEnter).order();
+           items.select('input.member-role').property('value', function (d) {
+             return d.role;
+           }).on('blur', changeRole).on('change', changeRole);
+           items.select('button.member-delete').on('click', deleteMember);
+           var dragOrigin, targetIndex;
+           items.call(d3_drag().on('start', function (d3_event) {
+             dragOrigin = {
+               x: d3_event.x,
+               y: d3_event.y
+             };
+             targetIndex = null;
+           }).on('drag', function (d3_event) {
+             var x = d3_event.x - dragOrigin.x,
+                 y = d3_event.y - dragOrigin.y;
+             if (!select(this).classed('dragging') && // don't display drag until dragging beyond a distance threshold
+             Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2)) <= 5) return;
+             var index = items.nodes().indexOf(this);
+             select(this).classed('dragging', true);
+             targetIndex = null;
+             selection.selectAll('li.member-row').style('transform', function (d2, index2) {
+               var node = select(this).node();
+
+               if (index === index2) {
+                 return 'translate(' + x + 'px, ' + y + 'px)';
+               } else if (index2 > index && d3_event.y > node.offsetTop) {
+                 if (targetIndex === null || index2 > targetIndex) {
+                   targetIndex = index2;
+                 }
 
-         for (var i = 0; i < this._coordinates.length; i++) {
-           env.expandToInclude(this$1._coordinates[i]);
-         }
-         return env
-       };
-       CoordinateArraySequence.prototype.copy = function copy () {
-           var this$1 = this;
+                 return 'translateY(-100%)';
+               } else if (index2 < index && d3_event.y < node.offsetTop + node.offsetHeight) {
+                 if (targetIndex === null || index2 < targetIndex) {
+                   targetIndex = index2;
+                 }
 
-         var cloneCoordinates = new Array(this.size()).fill(null);
-         for (var i = 0; i < this._coordinates.length; i++) {
-           cloneCoordinates[i] = this$1._coordinates[i].copy();
-         }
-         return new CoordinateArraySequence(cloneCoordinates, this._dimension)
-       };
-       CoordinateArraySequence.prototype.toString = function toString () {
-           var this$1 = this;
-
-         if (this._coordinates.length > 0) {
-           var strBuf = new StringBuffer(17 * this._coordinates.length);
-           strBuf.append('(');
-           strBuf.append(this._coordinates[0]);
-           for (var i = 1; i < this._coordinates.length; i++) {
-             strBuf.append(', ');
-             strBuf.append(this$1._coordinates[i]);
-           }
-           strBuf.append(')');
-           return strBuf.toString()
-         } else {
-           return '()'
-         }
-       };
-       CoordinateArraySequence.prototype.getY = function getY (index) {
-         return this._coordinates[index].y
-       };
-       CoordinateArraySequence.prototype.toCoordinateArray = function toCoordinateArray () {
-         return this._coordinates
-       };
-       CoordinateArraySequence.prototype.interfaces_ = function interfaces_ () {
-         return [CoordinateSequence, Serializable]
-       };
-       CoordinateArraySequence.prototype.getClass = function getClass () {
-         return CoordinateArraySequence
-       };
-       staticAccessors$18.serialVersionUID.get = function () { return -915438501601840650 };
+                 return 'translateY(100%)';
+               }
+
+               return null;
+             });
+           }).on('end', function (d3_event, d) {
+             if (!select(this).classed('dragging')) return;
+             var index = items.nodes().indexOf(this);
+             select(this).classed('dragging', false);
+             selection.selectAll('li.member-row').style('transform', null);
+
+             if (targetIndex !== null) {
+               // dragged to a new position, reorder
+               context.perform(actionMoveMember(d.relation.id, index, targetIndex), _t('operations.reorder_members.annotation'));
+               context.validator().validate();
+             }
+           }));
 
-       Object.defineProperties( CoordinateArraySequence, staticAccessors$18 );
+           function bindTypeahead(d) {
+             var row = select(this);
+             var role = row.selectAll('input.member-role');
+             var origValue = role.property('value');
 
-       var CoordinateArraySequenceFactory = function CoordinateArraySequenceFactory () {};
+             function sort(value, data) {
+               var sameletter = [];
+               var other = [];
 
-       var staticAccessors$17 = { serialVersionUID: { configurable: true },instanceObject: { configurable: true } };
+               for (var i = 0; i < data.length; i++) {
+                 if (data[i].value.substring(0, value.length) === value) {
+                   sameletter.push(data[i]);
+                 } else {
+                   other.push(data[i]);
+                 }
+               }
 
-       CoordinateArraySequenceFactory.prototype.readResolve = function readResolve () {
-         return CoordinateArraySequenceFactory.instance()
-       };
-       CoordinateArraySequenceFactory.prototype.create = function create () {
-         if (arguments.length === 1) {
-           if (arguments[0] instanceof Array) {
-             var coordinates = arguments[0];
-             return new CoordinateArraySequence(coordinates)
-           } else if (hasInterface(arguments[0], CoordinateSequence)) {
-             var coordSeq = arguments[0];
-             return new CoordinateArraySequence(coordSeq)
-           }
-         } else if (arguments.length === 2) {
-           var size = arguments[0];
-           var dimension = arguments[1];
-           if (dimension > 3) { dimension = 3; }
-           if (dimension < 2) { return new CoordinateArraySequence(size) }
-           return new CoordinateArraySequence(size, dimension)
-         }
-       };
-       CoordinateArraySequenceFactory.prototype.interfaces_ = function interfaces_ () {
-         return [CoordinateSequenceFactory, Serializable]
-       };
-       CoordinateArraySequenceFactory.prototype.getClass = function getClass () {
-         return CoordinateArraySequenceFactory
-       };
-       CoordinateArraySequenceFactory.instance = function instance () {
-         return CoordinateArraySequenceFactory.instanceObject
-       };
+               return sameletter.concat(other);
+             }
 
-       staticAccessors$17.serialVersionUID.get = function () { return -4099577099607551657 };
-       staticAccessors$17.instanceObject.get = function () { return new CoordinateArraySequenceFactory() };
+             role.call(uiCombobox(context, 'member-role').fetcher(function (role, callback) {
+               // The `geometry` param is used in the `taginfo.js` interface for
+               // filtering results, as a key into the `tag_members_fractions`
+               // object.  If we don't know the geometry because the member is
+               // not yet downloaded, it's ok to guess based on type.
+               var geometry;
 
-       Object.defineProperties( CoordinateArraySequenceFactory, staticAccessors$17 );
+               if (d.member) {
+                 geometry = context.graph().geometry(d.member.id);
+               } else if (d.type === 'relation') {
+                 geometry = 'relation';
+               } else if (d.type === 'way') {
+                 geometry = 'line';
+               } else {
+                 geometry = 'point';
+               }
 
-       /**
-        * @see http://download.oracle.com/javase/6/docs/api/java/util/HashMap.html
-        *
-        * @extends {javascript.util.Map}
-        * @constructor
-        * @private
-        */
-       var HashMap = (function (MapInterface) {
-         function HashMap () {
-           MapInterface.call(this);
-           this.map_ = new Map();
+               var rtype = entity.tags.type;
+               taginfo.roles({
+                 debounce: true,
+                 rtype: rtype || '',
+                 geometry: geometry,
+                 query: role
+               }, function (err, data) {
+                 if (!err) callback(sort(role, data));
+               });
+             }).on('cancel', function () {
+               role.property('value', origValue);
+             }));
+           }
+
+           function unbind() {
+             var row = select(this);
+             row.selectAll('input.member-role').call(uiCombobox.off, context);
+           }
          }
 
-         if ( MapInterface ) HashMap.__proto__ = MapInterface;
-         HashMap.prototype = Object.create( MapInterface && MapInterface.prototype );
-         HashMap.prototype.constructor = HashMap;
-         /**
-          * @override
-          */
-         HashMap.prototype.get = function get (key) {
-           return this.map_.get(key) || null
+         section.entityIDs = function (val) {
+           if (!arguments.length) return _entityIDs;
+           _entityIDs = val;
+           return section;
          };
 
-         /**
-          * @override
-          */
-         HashMap.prototype.put = function put (key, value) {
-           this.map_.set(key, value);
-           return value
-         };
+         return section;
+       }
 
-         /**
-          * @override
-          */
-         HashMap.prototype.values = function values () {
-           var arrayList = new ArrayList();
-           var it = this.map_.values();
-           var o = it.next();
-           while (!o.done) {
-             arrayList.add(o.value);
-             o = it.next();
+       function actionDeleteMembers(relationId, memberIndexes) {
+         return function (graph) {
+           // Remove the members in descending order so removals won't shift what members
+           // are at the remaining indexes
+           memberIndexes.sort(function (a, b) {
+             return b - a;
+           });
+
+           for (var i in memberIndexes) {
+             graph = actionDeleteMember(relationId, memberIndexes[i])(graph);
            }
-           return arrayList
-         };
 
-         /**
-          * @override
-          */
-         HashMap.prototype.entrySet = function entrySet () {
-           var hashSet = new HashSet();
-           this.map_.entries().forEach(function (entry) { return hashSet.add(entry); });
-           return hashSet
+           return graph;
          };
+       }
 
-         /**
-          * @override
-          */
-         HashMap.prototype.size = function size () {
-           return this.map_.size()
-         };
-
-         return HashMap;
-       }(Map$1$1));
-
-       var PrecisionModel = function PrecisionModel () {
-         this._modelType = null;
-         this._scale = null;
-         if (arguments.length === 0) {
-           this._modelType = PrecisionModel.FLOATING;
-         } else if (arguments.length === 1) {
-           if (arguments[0] instanceof Type$2) {
-             var modelType = arguments[0];
-             this._modelType = modelType;
-             if (modelType === PrecisionModel.FIXED) {
-               this.setScale(1.0);
-             }
-           } else if (typeof arguments[0] === 'number') {
-             var scale = arguments[0];
-             this._modelType = PrecisionModel.FIXED;
-             this.setScale(scale);
-           } else if (arguments[0] instanceof PrecisionModel) {
-             var pm = arguments[0];
-             this._modelType = pm._modelType;
-             this._scale = pm._scale;
-           }
-         }
-       };
+       function uiSectionRawMembershipEditor(context) {
+         var section = uiSection('raw-membership-editor', context).shouldDisplay(function () {
+           return _entityIDs && _entityIDs.length;
+         }).label(function () {
+           var parents = getSharedParentRelations();
+           var gt = parents.length > _maxMemberships ? '>' : '';
+           var count = gt + parents.slice(0, _maxMemberships).length;
+           return _t('inspector.title_count', {
+             title: _t.html('inspector.relations'),
+             count: count
+           });
+         }).disclosureContent(renderDisclosureContent);
+         var taginfo = services.taginfo;
+         var nearbyCombo = uiCombobox(context, 'parent-relation').minItems(1).fetcher(fetchNearbyRelations).itemsMouseEnter(function (d3_event, d) {
+           if (d.relation) utilHighlightEntities([d.relation.id], true, context);
+         }).itemsMouseLeave(function (d3_event, d) {
+           if (d.relation) utilHighlightEntities([d.relation.id], false, context);
+         });
+         var _inChange = false;
+         var _entityIDs = [];
 
-       var staticAccessors$19 = { serialVersionUID: { configurable: true },maximumPreciseValue: { configurable: true } };
-       PrecisionModel.prototype.equals = function equals (other) {
-         if (!(other instanceof PrecisionModel)) {
-           return false
-         }
-         var otherPrecisionModel = other;
-         return this._modelType === otherPrecisionModel._modelType && this._scale === otherPrecisionModel._scale
-       };
-       PrecisionModel.prototype.compareTo = function compareTo (o) {
-         var other = o;
-         var sigDigits = this.getMaximumSignificantDigits();
-         var otherSigDigits = other.getMaximumSignificantDigits();
-         return new Integer(sigDigits).compareTo(new Integer(otherSigDigits))
-       };
-       PrecisionModel.prototype.getScale = function getScale () {
-         return this._scale
-       };
-       PrecisionModel.prototype.isFloating = function isFloating () {
-         return this._modelType === PrecisionModel.FLOATING || this._modelType === PrecisionModel.FLOATING_SINGLE
-       };
-       PrecisionModel.prototype.getType = function getType () {
-         return this._modelType
-       };
-       PrecisionModel.prototype.toString = function toString () {
-         var description = 'UNKNOWN';
-         if (this._modelType === PrecisionModel.FLOATING) {
-           description = 'Floating';
-         } else if (this._modelType === PrecisionModel.FLOATING_SINGLE) {
-           description = 'Floating-Single';
-         } else if (this._modelType === PrecisionModel.FIXED) {
-           description = 'Fixed (Scale=' + this.getScale() + ')';
-         }
-         return description
-       };
-       PrecisionModel.prototype.makePrecise = function makePrecise () {
-         if (typeof arguments[0] === 'number') {
-           var val = arguments[0];
-           if (Double.isNaN(val)) { return val }
-           if (this._modelType === PrecisionModel.FLOATING_SINGLE) {
-             var floatSingleVal = val;
-             return floatSingleVal
-           }
-           if (this._modelType === PrecisionModel.FIXED) {
-             return Math.round(val * this._scale) / this._scale
-           }
-           return val
-         } else if (arguments[0] instanceof Coordinate) {
-           var coord = arguments[0];
-           if (this._modelType === PrecisionModel.FLOATING) { return null }
-           coord.x = this.makePrecise(coord.x);
-           coord.y = this.makePrecise(coord.y);
-         }
-       };
-       PrecisionModel.prototype.getMaximumSignificantDigits = function getMaximumSignificantDigits () {
-         var maxSigDigits = 16;
-         if (this._modelType === PrecisionModel.FLOATING) {
-           maxSigDigits = 16;
-         } else if (this._modelType === PrecisionModel.FLOATING_SINGLE) {
-           maxSigDigits = 6;
-         } else if (this._modelType === PrecisionModel.FIXED) {
-           maxSigDigits = 1 + Math.trunc(Math.ceil(Math.log(this.getScale()) / Math.log(10)));
-         }
-         return maxSigDigits
-       };
-       PrecisionModel.prototype.setScale = function setScale (scale) {
-         this._scale = Math.abs(scale);
-       };
-       PrecisionModel.prototype.interfaces_ = function interfaces_ () {
-         return [Serializable, Comparable]
-       };
-       PrecisionModel.prototype.getClass = function getClass () {
-         return PrecisionModel
-       };
-       PrecisionModel.mostPrecise = function mostPrecise (pm1, pm2) {
-         if (pm1.compareTo(pm2) >= 0) { return pm1 }
-         return pm2
-       };
-       staticAccessors$19.serialVersionUID.get = function () { return 7777263578777803835 };
-       staticAccessors$19.maximumPreciseValue.get = function () { return 9007199254740992.0 };
+         var _showBlank;
 
-       Object.defineProperties( PrecisionModel, staticAccessors$19 );
+         var _maxMemberships = 1000;
 
-       var Type$2 = function Type (name) {
-         this._name = name || null;
-         Type.nameToTypeMap.put(name, this);
-       };
+         function getSharedParentRelations() {
+           var parents = [];
 
-       var staticAccessors$1$1 = { serialVersionUID: { configurable: true },nameToTypeMap: { configurable: true } };
-       Type$2.prototype.readResolve = function readResolve () {
-         return Type$2.nameToTypeMap.get(this._name)
-       };
-       Type$2.prototype.toString = function toString () {
-         return this._name
-       };
-       Type$2.prototype.interfaces_ = function interfaces_ () {
-         return [Serializable]
-       };
-       Type$2.prototype.getClass = function getClass () {
-         return Type$2
-       };
-       staticAccessors$1$1.serialVersionUID.get = function () { return -5528602631731589822 };
-       staticAccessors$1$1.nameToTypeMap.get = function () { return new HashMap() };
-
-       Object.defineProperties( Type$2, staticAccessors$1$1 );
-
-       PrecisionModel.Type = Type$2;
-       PrecisionModel.FIXED = new Type$2('FIXED');
-       PrecisionModel.FLOATING = new Type$2('FLOATING');
-       PrecisionModel.FLOATING_SINGLE = new Type$2('FLOATING SINGLE');
-
-       var GeometryFactory = function GeometryFactory () {
-         this._precisionModel = new PrecisionModel();
-         this._SRID = 0;
-         this._coordinateSequenceFactory = GeometryFactory.getDefaultCoordinateSequenceFactory();
-
-         if (arguments.length === 0) ; else if (arguments.length === 1) {
-           if (hasInterface(arguments[0], CoordinateSequenceFactory)) {
-             this._coordinateSequenceFactory = arguments[0];
-           } else if (arguments[0] instanceof PrecisionModel) {
-             this._precisionModel = arguments[0];
-           }
-         } else if (arguments.length === 2) {
-           this._precisionModel = arguments[0];
-           this._SRID = arguments[1];
-         } else if (arguments.length === 3) {
-           this._precisionModel = arguments[0];
-           this._SRID = arguments[1];
-           this._coordinateSequenceFactory = arguments[2];
-         }
-       };
+           for (var i = 0; i < _entityIDs.length; i++) {
+             var entity = context.graph().hasEntity(_entityIDs[i]);
+             if (!entity) continue;
 
-       var staticAccessors$2 = { serialVersionUID: { configurable: true } };
-       GeometryFactory.prototype.toGeometry = function toGeometry (envelope) {
-         if (envelope.isNull()) {
-           return this.createPoint(null)
-         }
-         if (envelope.getMinX() === envelope.getMaxX() && envelope.getMinY() === envelope.getMaxY()) {
-           return this.createPoint(new Coordinate(envelope.getMinX(), envelope.getMinY()))
-         }
-         if (envelope.getMinX() === envelope.getMaxX() || envelope.getMinY() === envelope.getMaxY()) {
-           return this.createLineString([new Coordinate(envelope.getMinX(), envelope.getMinY()), new Coordinate(envelope.getMaxX(), envelope.getMaxY())])
-         }
-         return this.createPolygon(this.createLinearRing([new Coordinate(envelope.getMinX(), envelope.getMinY()), new Coordinate(envelope.getMinX(), envelope.getMaxY()), new Coordinate(envelope.getMaxX(), envelope.getMaxY()), new Coordinate(envelope.getMaxX(), envelope.getMinY()), new Coordinate(envelope.getMinX(), envelope.getMinY())]), null)
-       };
-       GeometryFactory.prototype.createLineString = function createLineString (coordinates) {
-         if (!coordinates) { return new LineString(this.getCoordinateSequenceFactory().create([]), this) }
-         else if (coordinates instanceof Array) { return new LineString(this.getCoordinateSequenceFactory().create(coordinates), this) }
-         else if (hasInterface(coordinates, CoordinateSequence)) { return new LineString(coordinates, this) }
-       };
-       GeometryFactory.prototype.createMultiLineString = function createMultiLineString () {
-         if (arguments.length === 0) {
-           return new MultiLineString(null, this)
-         } else if (arguments.length === 1) {
-           var lineStrings = arguments[0];
-           return new MultiLineString(lineStrings, this)
-         }
-       };
-       GeometryFactory.prototype.buildGeometry = function buildGeometry (geomList) {
-         var geomClass = null;
-         var isHeterogeneous = false;
-         var hasGeometryCollection = false;
-         for (var i = geomList.iterator(); i.hasNext();) {
-           var geom = i.next();
-           var partClass = geom.getClass();
-           if (geomClass === null) {
-             geomClass = partClass;
-           }
-           if (partClass !== geomClass) {
-             isHeterogeneous = true;
-           }
-           if (geom.isGeometryCollectionOrDerived()) { hasGeometryCollection = true; }
-         }
-         if (geomClass === null) {
-           return this.createGeometryCollection()
-         }
-         if (isHeterogeneous || hasGeometryCollection) {
-           return this.createGeometryCollection(GeometryFactory.toGeometryArray(geomList))
-         }
-         var geom0 = geomList.iterator().next();
-         var isCollection = geomList.size() > 1;
-         if (isCollection) {
-           if (geom0 instanceof Polygon) {
-             return this.createMultiPolygon(GeometryFactory.toPolygonArray(geomList))
-           } else if (geom0 instanceof LineString) {
-             return this.createMultiLineString(GeometryFactory.toLineStringArray(geomList))
-           } else if (geom0 instanceof Point$1) {
-             return this.createMultiPoint(GeometryFactory.toPointArray(geomList))
-           }
-           Assert.shouldNeverReachHere('Unhandled class: ' + geom0.getClass().getName());
-         }
-         return geom0
-       };
-       GeometryFactory.prototype.createMultiPointFromCoords = function createMultiPointFromCoords (coordinates) {
-         return this.createMultiPoint(coordinates !== null ? this.getCoordinateSequenceFactory().create(coordinates) : null)
-       };
-       GeometryFactory.prototype.createPoint = function createPoint () {
-         if (arguments.length === 0) {
-           return this.createPoint(this.getCoordinateSequenceFactory().create([]))
-         } else if (arguments.length === 1) {
-           if (arguments[0] instanceof Coordinate) {
-             var coordinate = arguments[0];
-             return this.createPoint(coordinate !== null ? this.getCoordinateSequenceFactory().create([coordinate]) : null)
-           } else if (hasInterface(arguments[0], CoordinateSequence)) {
-             var coordinates = arguments[0];
-             return new Point$1(coordinates, this)
-           }
-         }
-       };
-       GeometryFactory.prototype.getCoordinateSequenceFactory = function getCoordinateSequenceFactory () {
-         return this._coordinateSequenceFactory
-       };
-       GeometryFactory.prototype.createPolygon = function createPolygon () {
-         if (arguments.length === 0) {
-           return new Polygon(null, null, this)
-         } else if (arguments.length === 1) {
-           if (hasInterface(arguments[0], CoordinateSequence)) {
-             var coordinates = arguments[0];
-             return this.createPolygon(this.createLinearRing(coordinates))
-           } else if (arguments[0] instanceof Array) {
-             var coordinates$1 = arguments[0];
-             return this.createPolygon(this.createLinearRing(coordinates$1))
-           } else if (arguments[0] instanceof LinearRing) {
-             var shell = arguments[0];
-             return this.createPolygon(shell, null)
-           }
-         } else if (arguments.length === 2) {
-           var shell$1 = arguments[0];
-           var holes = arguments[1];
-           return new Polygon(shell$1, holes, this)
-         }
-       };
-       GeometryFactory.prototype.getSRID = function getSRID () {
-         return this._SRID
-       };
-       GeometryFactory.prototype.createGeometryCollection = function createGeometryCollection () {
-         if (arguments.length === 0) {
-           return new GeometryCollection(null, this)
-         } else if (arguments.length === 1) {
-           var geometries = arguments[0];
-           return new GeometryCollection(geometries, this)
-         }
-       };
-       GeometryFactory.prototype.createGeometry = function createGeometry (g) {
-         var editor = new GeometryEditor(this);
-         return editor.edit(g, {
-           edit: function () {
-             if (arguments.length === 2) {
-               var coordSeq = arguments[0];
-               // const geometry = arguments[1]
-               return this._coordinateSequenceFactory.create(coordSeq)
+             if (i === 0) {
+               parents = context.graph().parentRelations(entity);
+             } else {
+               parents = utilArrayIntersection(parents, context.graph().parentRelations(entity));
              }
+
+             if (!parents.length) break;
            }
-         })
-       };
-       GeometryFactory.prototype.getPrecisionModel = function getPrecisionModel () {
-         return this._precisionModel
-       };
-       GeometryFactory.prototype.createLinearRing = function createLinearRing () {
-         if (arguments.length === 0) {
-           return this.createLinearRing(this.getCoordinateSequenceFactory().create([]))
-         } else if (arguments.length === 1) {
-           if (arguments[0] instanceof Array) {
-             var coordinates = arguments[0];
-             return this.createLinearRing(coordinates !== null ? this.getCoordinateSequenceFactory().create(coordinates) : null)
-           } else if (hasInterface(arguments[0], CoordinateSequence)) {
-             var coordinates$1 = arguments[0];
-             return new LinearRing(coordinates$1, this)
-           }
-         }
-       };
-       GeometryFactory.prototype.createMultiPolygon = function createMultiPolygon () {
-         if (arguments.length === 0) {
-           return new MultiPolygon(null, this)
-         } else if (arguments.length === 1) {
-           var polygons = arguments[0];
-           return new MultiPolygon(polygons, this)
-         }
-       };
-       GeometryFactory.prototype.createMultiPoint = function createMultiPoint () {
-           var this$1 = this;
-
-         if (arguments.length === 0) {
-           return new MultiPoint(null, this)
-         } else if (arguments.length === 1) {
-           if (arguments[0] instanceof Array) {
-             var point = arguments[0];
-             return new MultiPoint(point, this)
-           } else if (arguments[0] instanceof Array) {
-             var coordinates = arguments[0];
-             return this.createMultiPoint(coordinates !== null ? this.getCoordinateSequenceFactory().create(coordinates) : null)
-           } else if (hasInterface(arguments[0], CoordinateSequence)) {
-             var coordinates$1 = arguments[0];
-             if (coordinates$1 === null) {
-               return this.createMultiPoint(new Array(0).fill(null))
-             }
-             var points = new Array(coordinates$1.size()).fill(null);
-             for (var i = 0; i < coordinates$1.size(); i++) {
-               var ptSeq = this$1.getCoordinateSequenceFactory().create(1, coordinates$1.getDimension());
-               CoordinateSequences.copy(coordinates$1, i, ptSeq, 0, 1);
-               points[i] = this$1.createPoint(ptSeq);
-             }
-             return this.createMultiPoint(points)
-           }
+
+           return parents;
          }
-       };
-       GeometryFactory.prototype.interfaces_ = function interfaces_ () {
-         return [Serializable]
-       };
-       GeometryFactory.prototype.getClass = function getClass () {
-         return GeometryFactory
-       };
-       GeometryFactory.toMultiPolygonArray = function toMultiPolygonArray (multiPolygons) {
-         var multiPolygonArray = new Array(multiPolygons.size()).fill(null);
-         return multiPolygons.toArray(multiPolygonArray)
-       };
-       GeometryFactory.toGeometryArray = function toGeometryArray (geometries) {
-         if (geometries === null) { return null }
-         var geometryArray = new Array(geometries.size()).fill(null);
-         return geometries.toArray(geometryArray)
-       };
-       GeometryFactory.getDefaultCoordinateSequenceFactory = function getDefaultCoordinateSequenceFactory () {
-         return CoordinateArraySequenceFactory.instance()
-       };
-       GeometryFactory.toMultiLineStringArray = function toMultiLineStringArray (multiLineStrings) {
-         var multiLineStringArray = new Array(multiLineStrings.size()).fill(null);
-         return multiLineStrings.toArray(multiLineStringArray)
-       };
-       GeometryFactory.toLineStringArray = function toLineStringArray (lineStrings) {
-         var lineStringArray = new Array(lineStrings.size()).fill(null);
-         return lineStrings.toArray(lineStringArray)
-       };
-       GeometryFactory.toMultiPointArray = function toMultiPointArray (multiPoints) {
-         var multiPointArray = new Array(multiPoints.size()).fill(null);
-         return multiPoints.toArray(multiPointArray)
-       };
-       GeometryFactory.toLinearRingArray = function toLinearRingArray (linearRings) {
-         var linearRingArray = new Array(linearRings.size()).fill(null);
-         return linearRings.toArray(linearRingArray)
-       };
-       GeometryFactory.toPointArray = function toPointArray (points) {
-         var pointArray = new Array(points.size()).fill(null);
-         return points.toArray(pointArray)
-       };
-       GeometryFactory.toPolygonArray = function toPolygonArray (polygons) {
-         var polygonArray = new Array(polygons.size()).fill(null);
-         return polygons.toArray(polygonArray)
-       };
-       GeometryFactory.createPointFromInternalCoord = function createPointFromInternalCoord (coord, exemplar) {
-         exemplar.getPrecisionModel().makePrecise(coord);
-         return exemplar.getFactory().createPoint(coord)
-       };
-       staticAccessors$2.serialVersionUID.get = function () { return -6820524753094095635 };
 
-       Object.defineProperties( GeometryFactory, staticAccessors$2 );
+         function getMemberships() {
+           var memberships = [];
+           var relations = getSharedParentRelations().slice(0, _maxMemberships);
+           var isMultiselect = _entityIDs.length > 1;
+           var i, relation, membership, index, member, indexedMember;
 
-       var geometryTypes = ['Point', 'MultiPoint', 'LineString', 'MultiLineString', 'Polygon', 'MultiPolygon'];
+           for (i = 0; i < relations.length; i++) {
+             relation = relations[i];
+             membership = {
+               relation: relation,
+               members: [],
+               hash: osmEntity.key(relation)
+             };
 
-       /**
-        * Class for reading and writing Well-Known Text.Create a new parser for GeoJSON
-        * NOTE: Adapted from OpenLayers 2.11 implementation.
-        */
+             for (index = 0; index < relation.members.length; index++) {
+               member = relation.members[index];
 
-       /**
-        * Create a new parser for GeoJSON
-        *
-        * @param {GeometryFactory} geometryFactory
-        * @return An instance of GeoJsonParser.
-        * @constructor
-        * @private
-        */
-       var GeoJSONParser = function GeoJSONParser (geometryFactory) {
-         this.geometryFactory = geometryFactory || new GeometryFactory();
-       };
-       /**
-        * Deserialize a GeoJSON object and return the Geometry or Feature(Collection) with JSTS Geometries
-        *
-        * @param {}
-        *        A GeoJSON object.
-        * @return {} A Geometry instance or object representing a Feature(Collection) with Geometry instances.
-        * @private
-        */
-       GeoJSONParser.prototype.read = function read (json) {
-         var obj;
-         if (typeof json === 'string') {
-           obj = JSON.parse(json);
-         } else {
-           obj = json;
-         }
+               if (_entityIDs.indexOf(member.id) !== -1) {
+                 indexedMember = Object.assign({}, member, {
+                   index: index
+                 });
+                 membership.members.push(indexedMember);
+                 membership.hash += ',' + index.toString();
+
+                 if (!isMultiselect) {
+                   // For single selections, list one entry per membership per relation.
+                   // For multiselections, list one entry per relation.
+                   memberships.push(membership);
+                   membership = {
+                     relation: relation,
+                     members: [],
+                     hash: osmEntity.key(relation)
+                   };
+                 }
+               }
+             }
 
-         var type = obj.type;
+             if (membership.members.length) memberships.push(membership);
+           }
 
-         if (!parse$2[type]) {
-           throw new Error('Unknown GeoJSON type: ' + obj.type)
+           memberships.forEach(function (membership) {
+             membership.domId = utilUniqueDomId('membership-' + membership.relation.id);
+             var roles = [];
+             membership.members.forEach(function (member) {
+               if (roles.indexOf(member.role) === -1) roles.push(member.role);
+             });
+             membership.role = roles.length === 1 ? roles[0] : roles;
+           });
+           return memberships;
          }
 
-         if (geometryTypes.indexOf(type) !== -1) {
-           return parse$2[type].apply(this, [obj.coordinates])
-         } else if (type === 'GeometryCollection') {
-           return parse$2[type].apply(this, [obj.geometries])
-         }
+         function selectRelation(d3_event, d) {
+           d3_event.preventDefault(); // remove the hover-highlight styling
 
-         // feature or feature collection
-         return parse$2[type].apply(this, [obj])
-       };
+           utilHighlightEntities([d.relation.id], false, context);
+           context.enter(modeSelect(context, [d.relation.id]));
+         }
 
-       /**
-        * Serialize a Geometry object into GeoJSON
-        *
-        * @param {Geometry}
-        *        geometry A Geometry or array of Geometries.
-        * @return {Object} A GeoJSON object represting the input Geometry/Geometries.
-        * @private
-        */
-       GeoJSONParser.prototype.write = function write (geometry) {
-         var type = geometry.getGeometryType();
+         function zoomToRelation(d3_event, d) {
+           d3_event.preventDefault();
+           var entity = context.entity(d.relation.id);
+           context.map().zoomToEase(entity); // highlight the relation in case it wasn't previously on-screen
 
-         if (!extract[type]) {
-           throw new Error('Geometry is not supported')
+           utilHighlightEntities([d.relation.id], true, context);
          }
 
-         return extract[type].apply(this, [geometry])
-       };
-
-       var parse$2 = {
-         /**
-          * Parse a GeoJSON Feature object
-          *
-          * @param {Object}
-          *          obj Object to parse.
-          *
-          * @return {Object} Feature with geometry/bbox converted to JSTS Geometries.
-          */
-         Feature: function (obj) {
-           var feature = {};
+         function changeRole(d3_event, d) {
+           if (d === 0) return; // called on newrow (shouldn't happen)
 
-           // copy features
-           for (var key in obj) {
-             feature[key] = obj[key];
-           }
+           if (_inChange) return; // avoid accidental recursive call #5731
 
-           // parse geometry
-           if (obj.geometry) {
-             var type = obj.geometry.type;
-             if (!parse$2[type]) {
-               throw new Error('Unknown GeoJSON type: ' + obj.type)
-             }
-             feature.geometry = this.read(obj.geometry);
-           }
+           var newRole = context.cleanRelationRole(select(this).property('value'));
+           if (!newRole.trim() && typeof d.role !== 'string') return;
+           var membersToUpdate = d.members.filter(function (member) {
+             return member.role !== newRole;
+           });
 
-           // bbox
-           if (obj.bbox) {
-             feature.bbox = parse$2.bbox.apply(this, [obj.bbox]);
+           if (membersToUpdate.length) {
+             _inChange = true;
+             context.perform(function actionChangeMemberRoles(graph) {
+               membersToUpdate.forEach(function (member) {
+                 var newMember = Object.assign({}, member, {
+                   role: newRole
+                 });
+                 delete newMember.index;
+                 graph = actionChangeMember(d.relation.id, newMember, member.index)(graph);
+               });
+               return graph;
+             }, _t('operations.change_role.annotation', {
+               n: membersToUpdate.length
+             }));
+             context.validator().validate();
            }
 
-           return feature
-         },
-
-         /**
-          * Parse a GeoJSON FeatureCollection object
-          *
-          * @param {Object}
-          *          obj Object to parse.
-          *
-          * @return {Object} FeatureCollection with geometry/bbox converted to JSTS Geometries.
-          */
-         FeatureCollection: function (obj) {
-           var this$1 = this;
+           _inChange = false;
+         }
 
-           var featureCollection = {};
+         function addMembership(d, role) {
+           this.blur(); // avoid keeping focus on the button
 
-           if (obj.features) {
-             featureCollection.features = [];
+           _showBlank = false;
 
-             for (var i = 0; i < obj.features.length; ++i) {
-               featureCollection.features.push(this$1.read(obj.features[i]));
-             }
-           }
+           function actionAddMembers(relationId, ids, role) {
+             return function (graph) {
+               for (var i in ids) {
+                 var member = {
+                   id: ids[i],
+                   type: graph.entity(ids[i]).type,
+                   role: role
+                 };
+                 graph = actionAddMember(relationId, member)(graph);
+               }
 
-           if (obj.bbox) {
-             featureCollection.bbox = this.parse.bbox.apply(this, [obj.bbox]);
+               return graph;
+             };
            }
 
-           return featureCollection
-         },
+           if (d.relation) {
+             context.perform(actionAddMembers(d.relation.id, _entityIDs, role), _t('operations.add_member.annotation', {
+               n: _entityIDs.length
+             }));
+             context.validator().validate();
+           } else {
+             var relation = osmRelation();
+             context.perform(actionAddEntity(relation), actionAddMembers(relation.id, _entityIDs, role), _t('operations.add.annotation.relation')); // changing the mode also runs `validate`
 
-         /**
-          * Convert the ordinates in an array to an array of Coordinates
-          *
-          * @param {Array}
-          *          array Array with {Number}s.
-          *
-          * @return {Array} Array with Coordinates.
-          */
-         coordinates: function (array) {
-           var coordinates = [];
-           for (var i = 0; i < array.length; ++i) {
-             var sub = array[i];
-             coordinates.push(new Coordinate(sub[0], sub[1]));
+             context.enter(modeSelect(context, [relation.id]).newFeature(true));
            }
-           return coordinates
-         },
+         }
 
-         /**
-          * Convert the bbox to a LinearRing
-          *
-          * @param {Array}
-          *          array Array with [xMin, yMin, xMax, yMax].
-          *
-          * @return {Array} Array with Coordinates.
-          */
-         bbox: function (array) {
-           return this.geometryFactory.createLinearRing([
-             new Coordinate(array[0], array[1]),
-             new Coordinate(array[2], array[1]),
-             new Coordinate(array[2], array[3]),
-             new Coordinate(array[0], array[3]),
-             new Coordinate(array[0], array[1])
-           ])
-         },
+         function deleteMembership(d3_event, d) {
+           this.blur(); // avoid keeping focus on the button
 
-         /**
-          * Convert an Array with ordinates to a Point
-          *
-          * @param {Array}
-          *          array Array with ordinates.
-          *
-          * @return {Point} Point.
-          */
-         Point: function (array) {
-           var coordinate = new Coordinate(array[0], array[1]);
-           return this.geometryFactory.createPoint(coordinate)
-         },
+           if (d === 0) return; // called on newrow (shouldn't happen)
+           // remove the hover-highlight styling
 
-         /**
-          * Convert an Array with coordinates to a MultiPoint
-          *
-          * @param {Array}
-          *          array Array with coordinates.
-          *
-          * @return {MultiPoint} MultiPoint.
-          */
-         MultiPoint: function (array) {
-           var this$1 = this;
+           utilHighlightEntities([d.relation.id], false, context);
+           var indexes = d.members.map(function (member) {
+             return member.index;
+           });
+           context.perform(actionDeleteMembers(d.relation.id, indexes), _t('operations.delete_member.annotation', {
+             n: _entityIDs.length
+           }));
+           context.validator().validate();
+         }
 
-           var points = [];
-           for (var i = 0; i < array.length; ++i) {
-             points.push(parse$2.Point.apply(this$1, [array[i]]));
+         function fetchNearbyRelations(q, callback) {
+           var newRelation = {
+             relation: null,
+             value: _t('inspector.new_relation'),
+             display: _t.html('inspector.new_relation')
+           };
+           var entityID = _entityIDs[0];
+           var result = [];
+           var graph = context.graph();
+
+           function baseDisplayLabel(entity) {
+             var matched = _mainPresetIndex.match(entity, graph);
+             var presetName = matched && matched.name() || _t('inspector.relation');
+             var entityName = utilDisplayName(entity) || '';
+             return presetName + ' ' + entityName;
            }
-           return this.geometryFactory.createMultiPoint(points)
-         },
 
-         /**
-          * Convert an Array with coordinates to a LineString
-          *
-          * @param {Array}
-          *          array Array with coordinates.
-          *
-          * @return {LineString} LineString.
-          */
-         LineString: function (array) {
-           var coordinates = parse$2.coordinates.apply(this, [array]);
-           return this.geometryFactory.createLineString(coordinates)
-         },
+           var explicitRelation = q && context.hasEntity(q.toLowerCase());
 
-         /**
-          * Convert an Array with coordinates to a MultiLineString
-          *
-          * @param {Array}
-          *          array Array with coordinates.
-          *
-          * @return {MultiLineString} MultiLineString.
-          */
-         MultiLineString: function (array) {
-           var this$1 = this;
+           if (explicitRelation && explicitRelation.type === 'relation' && explicitRelation.id !== entityID) {
+             // loaded relation is specified explicitly, only show that
+             result.push({
+               relation: explicitRelation,
+               value: baseDisplayLabel(explicitRelation) + ' ' + explicitRelation.id
+             });
+           } else {
+             context.history().intersects(context.map().extent()).forEach(function (entity) {
+               if (entity.type !== 'relation' || entity.id === entityID) return;
+               var value = baseDisplayLabel(entity);
+               if (q && (value + ' ' + entity.id).toLowerCase().indexOf(q.toLowerCase()) === -1) return;
+               result.push({
+                 relation: entity,
+                 value: value
+               });
+             });
+             result.sort(function (a, b) {
+               return osmRelation.creationOrder(a.relation, b.relation);
+             }); // Dedupe identical names by appending relation id - see #2891
 
-           var lineStrings = [];
-           for (var i = 0; i < array.length; ++i) {
-             lineStrings.push(parse$2.LineString.apply(this$1, [array[i]]));
+             var dupeGroups = Object.values(utilArrayGroupBy(result, 'value')).filter(function (v) {
+               return v.length > 1;
+             });
+             dupeGroups.forEach(function (group) {
+               group.forEach(function (obj) {
+                 obj.value += ' ' + obj.relation.id;
+               });
+             });
            }
-           return this.geometryFactory.createMultiLineString(lineStrings)
-         },
 
-         /**
-          * Convert an Array to a Polygon
-          *
-          * @param {Array}
-          *          array Array with shell and holes.
-          *
-          * @return {Polygon} Polygon.
-          */
-         Polygon: function (array) {
-           var this$1 = this;
+           result.forEach(function (obj) {
+             obj.title = obj.value;
+           });
+           result.unshift(newRelation);
+           callback(result);
+         }
 
-           var shellCoordinates = parse$2.coordinates.apply(this, [array[0]]);
-           var shell = this.geometryFactory.createLinearRing(shellCoordinates);
-           var holes = [];
-           for (var i = 1; i < array.length; ++i) {
-             var hole = array[i];
-             var coordinates = parse$2.coordinates.apply(this$1, [hole]);
-             var linearRing = this$1.geometryFactory.createLinearRing(coordinates);
-             holes.push(linearRing);
-           }
-           return this.geometryFactory.createPolygon(shell, holes)
-         },
+         function renderDisclosureContent(selection) {
+           var memberships = getMemberships();
+           var list = selection.selectAll('.member-list').data([0]);
+           list = list.enter().append('ul').attr('class', 'member-list').merge(list);
+           var items = list.selectAll('li.member-row-normal').data(memberships, function (d) {
+             return d.hash;
+           });
+           items.exit().each(unbind).remove(); // Enter
 
-         /**
-          * Convert an Array to a MultiPolygon
-          *
-          * @param {Array}
-          *          array Array of arrays with shell and rings.
-          *
-          * @return {MultiPolygon} MultiPolygon.
-          */
-         MultiPolygon: function (array) {
-           var this$1 = this;
+           var itemsEnter = items.enter().append('li').attr('class', 'member-row member-row-normal form-field'); // highlight the relation in the map while hovering on the list item
 
-           var polygons = [];
-           for (var i = 0; i < array.length; ++i) {
-             var polygon = array[i];
-             polygons.push(parse$2.Polygon.apply(this$1, [polygon]));
-           }
-           return this.geometryFactory.createMultiPolygon(polygons)
-         },
+           itemsEnter.on('mouseover', function (d3_event, d) {
+             utilHighlightEntities([d.relation.id], true, context);
+           }).on('mouseout', function (d3_event, d) {
+             utilHighlightEntities([d.relation.id], false, context);
+           });
+           var labelEnter = itemsEnter.append('label').attr('class', 'field-label').attr('for', function (d) {
+             return d.domId;
+           });
+           var labelLink = labelEnter.append('span').attr('class', 'label-text').append('a').attr('href', '#').on('click', selectRelation);
+           labelLink.append('span').attr('class', 'member-entity-type').html(function (d) {
+             var matched = _mainPresetIndex.match(d.relation, context.graph());
+             return matched && matched.name() || _t('inspector.relation');
+           });
+           labelLink.append('span').attr('class', 'member-entity-name').html(function (d) {
+             return utilDisplayName(d.relation);
+           });
+           labelEnter.append('button').attr('class', 'remove member-delete').call(svgIcon('#iD-operation-delete')).on('click', deleteMembership);
+           labelEnter.append('button').attr('class', 'member-zoom').attr('title', _t('icons.zoom_to')).call(svgIcon('#iD-icon-framed-dot', 'monochrome')).on('click', zoomToRelation);
+           var wrapEnter = itemsEnter.append('div').attr('class', 'form-field-input-wrap form-field-input-member');
+           wrapEnter.append('input').attr('class', 'member-role').attr('id', function (d) {
+             return d.domId;
+           }).property('type', 'text').property('value', function (d) {
+             return typeof d.role === 'string' ? d.role : '';
+           }).attr('title', function (d) {
+             return Array.isArray(d.role) ? d.role.filter(Boolean).join('\n') : d.role;
+           }).attr('placeholder', function (d) {
+             return Array.isArray(d.role) ? _t('inspector.multiple_roles') : _t('inspector.role');
+           }).classed('mixed', function (d) {
+             return Array.isArray(d.role);
+           }).call(utilNoAuto).on('blur', changeRole).on('change', changeRole);
+
+           if (taginfo) {
+             wrapEnter.each(bindTypeahead);
+           }
+
+           var newMembership = list.selectAll('.member-row-new').data(_showBlank ? [0] : []); // Exit
+
+           newMembership.exit().remove(); // Enter
+
+           var newMembershipEnter = newMembership.enter().append('li').attr('class', 'member-row member-row-new form-field');
+           var newLabelEnter = newMembershipEnter.append('label').attr('class', 'field-label');
+           newLabelEnter.append('input').attr('placeholder', _t('inspector.choose_relation')).attr('type', 'text').attr('class', 'member-entity-input').call(utilNoAuto);
+           newLabelEnter.append('button').attr('class', 'remove member-delete').call(svgIcon('#iD-operation-delete')).on('click', function () {
+             list.selectAll('.member-row-new').remove();
+           });
+           var newWrapEnter = newMembershipEnter.append('div').attr('class', 'form-field-input-wrap form-field-input-member');
+           newWrapEnter.append('input').attr('class', 'member-role').property('type', 'text').attr('placeholder', _t('inspector.role')).call(utilNoAuto); // Update
 
-         /**
-          * Convert an Array to a GeometryCollection
-          *
-          * @param {Array}
-          *          array Array of GeoJSON geometries.
-          *
-          * @return {GeometryCollection} GeometryCollection.
-          */
-         GeometryCollection: function (array) {
-           var this$1 = this;
+           newMembership = newMembership.merge(newMembershipEnter);
+           newMembership.selectAll('.member-entity-input').on('blur', cancelEntity) // if it wasn't accepted normally, cancel it
+           .call(nearbyCombo.on('accept', acceptEntity).on('cancel', cancelEntity)); // Container for the Add button
 
-           var geometries = [];
-           for (var i = 0; i < array.length; ++i) {
-             var geometry = array[i];
-             geometries.push(this$1.read(geometry));
-           }
-           return this.geometryFactory.createGeometryCollection(geometries)
-         }
-       };
+           var addRow = selection.selectAll('.add-row').data([0]); // enter
 
-       var extract = {
-         /**
-          * Convert a Coordinate to an Array
-          *
-          * @param {Coordinate}
-          *          coordinate Coordinate to convert.
-          *
-          * @return {Array} Array of ordinates.
-          */
-         coordinate: function (coordinate) {
-           return [coordinate.x, coordinate.y]
-         },
+           var addRowEnter = addRow.enter().append('div').attr('class', 'add-row');
+           var addRelationButton = addRowEnter.append('button').attr('class', 'add-relation');
+           addRelationButton.call(svgIcon('#iD-icon-plus', 'light'));
+           addRelationButton.call(uiTooltip().title(_t.html('inspector.add_to_relation')).placement(_mainLocalizer.textDirection() === 'ltr' ? 'right' : 'left'));
+           addRowEnter.append('div').attr('class', 'space-value'); // preserve space
 
-         /**
-          * Convert a Point to a GeoJSON object
-          *
-          * @param {Point}
-          *          point Point to convert.
-          *
-          * @return {Array} Array of 2 ordinates (paired to a coordinate).
-          */
-         Point: function (point) {
-           var array = extract.coordinate.apply(this, [point.getCoordinate()]);
-           return {
-             type: 'Point',
-             coordinates: array
-           }
-         },
+           addRowEnter.append('div').attr('class', 'space-buttons'); // preserve space
+           // update
 
-         /**
-          * Convert a MultiPoint to a GeoJSON object
-          *
-          * @param {MultiPoint}
-          *          multipoint MultiPoint to convert.
-          *
-          * @return {Array} Array of coordinates.
-          */
-         MultiPoint: function (multipoint) {
-           var this$1 = this;
+           addRow = addRow.merge(addRowEnter);
+           addRow.select('.add-relation').on('click', function () {
+             _showBlank = true;
+             section.reRender();
+             list.selectAll('.member-entity-input').node().focus();
+           });
 
-           var array = [];
-           for (var i = 0; i < multipoint._geometries.length; ++i) {
-             var point = multipoint._geometries[i];
-             var geoJson = extract.Point.apply(this$1, [point]);
-             array.push(geoJson.coordinates);
-           }
-           return {
-             type: 'MultiPoint',
-             coordinates: array
-           }
-         },
+           function acceptEntity(d) {
+             if (!d) {
+               cancelEntity();
+               return;
+             } // remove hover-higlighting
 
-         /**
-          * Convert a LineString to a GeoJSON object
-          *
-          * @param {LineString}
-          *          linestring LineString to convert.
-          *
-          * @return {Array} Array of coordinates.
-          */
-         LineString: function (linestring) {
-           var this$1 = this;
 
-           var array = [];
-           var coordinates = linestring.getCoordinates();
-           for (var i = 0; i < coordinates.length; ++i) {
-             var coordinate = coordinates[i];
-             array.push(extract.coordinate.apply(this$1, [coordinate]));
-           }
-           return {
-             type: 'LineString',
-             coordinates: array
+             if (d.relation) utilHighlightEntities([d.relation.id], false, context);
+             var role = context.cleanRelationRole(list.selectAll('.member-row-new .member-role').property('value'));
+             addMembership(d, role);
            }
-         },
 
-         /**
-          * Convert a MultiLineString to a GeoJSON object
-          *
-          * @param {MultiLineString}
-          *          multilinestring MultiLineString to convert.
-          *
-          * @return {Array} Array of Array of coordinates.
-          */
-         MultiLineString: function (multilinestring) {
-           var this$1 = this;
+           function cancelEntity() {
+             var input = newMembership.selectAll('.member-entity-input');
+             input.property('value', ''); // remove hover-higlighting
 
-           var array = [];
-           for (var i = 0; i < multilinestring._geometries.length; ++i) {
-             var linestring = multilinestring._geometries[i];
-             var geoJson = extract.LineString.apply(this$1, [linestring]);
-             array.push(geoJson.coordinates);
+             context.surface().selectAll('.highlighted').classed('highlighted', false);
            }
-           return {
-             type: 'MultiLineString',
-             coordinates: array
-           }
-         },
-
-         /**
-          * Convert a Polygon to a GeoJSON object
-          *
-          * @param {Polygon}
-          *          polygon Polygon to convert.
-          *
-          * @return {Array} Array with shell, holes.
-          */
-         Polygon: function (polygon) {
-           var this$1 = this;
 
-           var array = [];
-           var shellGeoJson = extract.LineString.apply(this, [polygon._shell]);
-           array.push(shellGeoJson.coordinates);
-           for (var i = 0; i < polygon._holes.length; ++i) {
-             var hole = polygon._holes[i];
-             var holeGeoJson = extract.LineString.apply(this$1, [hole]);
-             array.push(holeGeoJson.coordinates);
-           }
-           return {
-             type: 'Polygon',
-             coordinates: array
-           }
-         },
+           function bindTypeahead(d) {
+             var row = select(this);
+             var role = row.selectAll('input.member-role');
+             var origValue = role.property('value');
 
-         /**
-          * Convert a MultiPolygon to a GeoJSON object
-          *
-          * @param {MultiPolygon}
-          *          multipolygon MultiPolygon to convert.
-          *
-          * @return {Array} Array of polygons.
-          */
-         MultiPolygon: function (multipolygon) {
-           var this$1 = this;
+             function sort(value, data) {
+               var sameletter = [];
+               var other = [];
 
-           var array = [];
-           for (var i = 0; i < multipolygon._geometries.length; ++i) {
-             var polygon = multipolygon._geometries[i];
-             var geoJson = extract.Polygon.apply(this$1, [polygon]);
-             array.push(geoJson.coordinates);
-           }
-           return {
-             type: 'MultiPolygon',
-             coordinates: array
-           }
-         },
+               for (var i = 0; i < data.length; i++) {
+                 if (data[i].value.substring(0, value.length) === value) {
+                   sameletter.push(data[i]);
+                 } else {
+                   other.push(data[i]);
+                 }
+               }
 
-         /**
-          * Convert a GeometryCollection to a GeoJSON object
-          *
-          * @param {GeometryCollection}
-          *          collection GeometryCollection to convert.
-          *
-          * @return {Array} Array of geometries.
-          */
-         GeometryCollection: function (collection) {
-           var this$1 = this;
+               return sameletter.concat(other);
+             }
 
-           var array = [];
-           for (var i = 0; i < collection._geometries.length; ++i) {
-             var geometry = collection._geometries[i];
-             var type = geometry.getGeometryType();
-             array.push(extract[type].apply(this$1, [geometry]));
+             role.call(uiCombobox(context, 'member-role').fetcher(function (role, callback) {
+               var rtype = d.relation.tags.type;
+               taginfo.roles({
+                 debounce: true,
+                 rtype: rtype || '',
+                 geometry: context.graph().geometry(_entityIDs[0]),
+                 query: role
+               }, function (err, data) {
+                 if (!err) callback(sort(role, data));
+               });
+             }).on('cancel', function () {
+               role.property('value', origValue);
+             }));
            }
-           return {
-             type: 'GeometryCollection',
-             geometries: array
+
+           function unbind() {
+             var row = select(this);
+             row.selectAll('input.member-role').call(uiCombobox.off, context);
            }
          }
-       };
-
-       /**
-        * Converts a geometry in GeoJSON to a {@link Geometry}.
-        */
-
-       /**
-        * A <code>GeoJSONReader</code> is parameterized by a <code>GeometryFactory</code>,
-        * to allow it to create <code>Geometry</code> objects of the appropriate
-        * implementation. In particular, the <code>GeometryFactory</code> determines
-        * the <code>PrecisionModel</code> and <code>SRID</code> that is used.
-        *
-        * @param {GeometryFactory} geometryFactory
-        * @constructor
-        */
-       var GeoJSONReader = function GeoJSONReader (geometryFactory) {
-         this.geometryFactory = geometryFactory || new GeometryFactory();
-         this.precisionModel = this.geometryFactory.getPrecisionModel();
-         this.parser = new GeoJSONParser(this.geometryFactory);
-       };
-       /**
-        * Reads a GeoJSON representation of a {@link Geometry}
-        *
-        * Will also parse GeoJSON Features/FeatureCollections as custom objects.
-        *
-        * @param {Object|String} geoJson a GeoJSON Object or String.
-        * @return {Geometry|Object} a <code>Geometry or Feature/FeatureCollection representation.</code>
-        * @memberof GeoJSONReader
-        */
-       GeoJSONReader.prototype.read = function read (geoJson) {
-         var geometry = this.parser.read(geoJson);
 
-         if (this.precisionModel.getType() === PrecisionModel.FIXED) {
-           this.reducePrecision(geometry);
-         }
+         section.entityIDs = function (val) {
+           if (!arguments.length) return _entityIDs;
+           _entityIDs = val;
+           _showBlank = false;
+           return section;
+         };
 
-         return geometry
-       };
+         return section;
+       }
 
-       // NOTE: this is a hack
-       GeoJSONReader.prototype.reducePrecision = function reducePrecision (geometry) {
-           var this$1 = this;
+       function uiSectionSelectionList(context) {
+         var _selectedIDs = [];
+         var section = uiSection('selected-features', context).shouldDisplay(function () {
+           return _selectedIDs.length > 1;
+         }).label(function () {
+           return _t('inspector.title_count', {
+             title: _t.html('inspector.features'),
+             count: _selectedIDs.length
+           });
+         }).disclosureContent(renderDisclosureContent);
+         context.history().on('change.selectionList', function (difference) {
+           if (difference) {
+             section.reRender();
+           }
+         });
 
-         var i, len;
+         section.entityIDs = function (val) {
+           if (!arguments.length) return _selectedIDs;
+           _selectedIDs = val;
+           return section;
+         };
 
-         if (geometry.coordinate) {
-           this.precisionModel.makePrecise(geometry.coordinate);
-         } else if (geometry.points) {
-           for (i = 0, len = geometry.points.length; i < len; i++) {
-             this$1.precisionModel.makePrecise(geometry.points[i]);
-           }
-         } else if (geometry.geometries) {
-           for (i = 0, len = geometry.geometries.length; i < len; i++) {
-             this$1.reducePrecision(geometry.geometries[i]);
-           }
+         function selectEntity(d3_event, entity) {
+           context.enter(modeSelect(context, [entity.id]));
          }
-       };
 
-       /**
-        * @module GeoJSONWriter
-        */
-
-       /**
-        * Writes the GeoJSON representation of a {@link Geometry}. The
-        * The GeoJSON format is defined <A
-        * HREF="http://geojson.org/geojson-spec.html">here</A>.
-        */
+         function deselectEntity(d3_event, entity) {
+           d3_event.stopPropagation();
 
-       /**
-        * The <code>GeoJSONWriter</code> outputs coordinates rounded to the precision
-        * model. Only the maximum number of decimal places necessary to represent the
-        * ordinates to the required precision will be output.
-        *
-        * @param {GeometryFactory} geometryFactory
-        * @constructor
-        */
-       var GeoJSONWriter = function GeoJSONWriter () {
-         this.parser = new GeoJSONParser(this.geometryFactory);
-       };
-       /**
-        * Converts a <code>Geometry</code> to its GeoJSON representation.
-        *
-        * @param {Geometry}
-        *        geometry a <code>Geometry</code> to process.
-        * @return {Object} The GeoJSON representation of the Geometry.
-        * @memberof GeoJSONWriter
-        */
-       GeoJSONWriter.prototype.write = function write (geometry) {
-         return this.parser.write(geometry)
-       };
+           var selectedIDs = _selectedIDs.slice();
 
-       /* eslint-disable no-undef */
+           var index = selectedIDs.indexOf(entity.id);
 
-       // io
+           if (index > -1) {
+             selectedIDs.splice(index, 1);
+             context.enter(modeSelect(context, selectedIDs));
+           }
+         }
 
-       var Position = function Position () {};
+         function renderDisclosureContent(selection) {
+           var list = selection.selectAll('.feature-list').data([0]);
+           list = list.enter().append('div').attr('class', 'feature-list').merge(list);
 
-       var staticAccessors$20 = { ON: { configurable: true },LEFT: { configurable: true },RIGHT: { configurable: true } };
+           var entities = _selectedIDs.map(function (id) {
+             return context.hasEntity(id);
+           }).filter(Boolean);
 
-       Position.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       Position.prototype.getClass = function getClass () {
-         return Position
-       };
-       Position.opposite = function opposite (position) {
-         if (position === Position.LEFT) { return Position.RIGHT }
-         if (position === Position.RIGHT) { return Position.LEFT }
-         return position
-       };
-       staticAccessors$20.ON.get = function () { return 0 };
-       staticAccessors$20.LEFT.get = function () { return 1 };
-       staticAccessors$20.RIGHT.get = function () { return 2 };
+           var items = list.selectAll('.feature-list-item').data(entities, osmEntity.key);
+           items.exit().remove(); // Enter
 
-       Object.defineProperties( Position, staticAccessors$20 );
+           var enter = items.enter().append('button').attr('class', 'feature-list-item').on('click', selectEntity);
+           enter.each(function (d) {
+             select(this).on('mouseover', function () {
+               utilHighlightEntities([d.id], true, context);
+             });
+             select(this).on('mouseout', function () {
+               utilHighlightEntities([d.id], false, context);
+             });
+           });
+           var label = enter.append('div').attr('class', 'label');
+           enter.append('button').attr('class', 'close').attr('title', _t('icons.deselect')).on('click', deselectEntity).call(svgIcon('#iD-icon-close'));
+           label.append('span').attr('class', 'entity-geom-icon').call(svgIcon('', 'pre-text'));
+           label.append('span').attr('class', 'entity-type');
+           label.append('span').attr('class', 'entity-name'); // Update
+
+           items = items.merge(enter);
+           items.selectAll('.entity-geom-icon use').attr('href', function () {
+             var entity = this.parentNode.parentNode.__data__;
+             return '#iD-icon-' + entity.geometry(context.graph());
+           });
+           items.selectAll('.entity-type').html(function (entity) {
+             return _mainPresetIndex.match(entity, context.graph()).name();
+           });
+           items.selectAll('.entity-name').html(function (d) {
+             // fetch latest entity
+             var entity = context.entity(d.id);
+             return utilDisplayName(entity);
+           });
+         }
 
-       /**
-        * @param {string=} message Optional message
-        * @extends {Error}
-        * @constructor
-        * @private
-        */
-       function EmptyStackException (message) {
-         this.message = message || '';
+         return section;
        }
-       EmptyStackException.prototype = new Error();
 
-       /**
-        * @type {string}
-        */
-       EmptyStackException.prototype.name = 'EmptyStackException';
-
-       /**
-        * @see http://download.oracle.com/javase/6/docs/api/java/util/Stack.html
-        *
-        * @extends {List}
-        * @constructor
-        * @private
-        */
-       function Stack () {
-         /**
-          * @type {Array}
-          * @private
-          */
-         this.array_ = [];
-       }
-       Stack.prototype = new List();
+       function uiEntityEditor(context) {
+         var dispatch$1 = dispatch('choose');
+         var _state = 'select';
+         var _coalesceChanges = false;
+         var _modified = false;
 
-       /**
-        * @override
-        */
-       Stack.prototype.add = function (e) {
-         this.array_.push(e);
-         return true
-       };
+         var _base;
 
-       /**
-        * @override
-        */
-       Stack.prototype.get = function (index) {
-         if (index < 0 || index >= this.size()) {
-           throw new Error()
-         }
+         var _entityIDs;
 
-         return this.array_[index]
-       };
+         var _activePresets = [];
 
-       /**
-        * Pushes an item onto the top of this stack.
-        * @param {Object} e
-        * @return {Object}
-        */
-       Stack.prototype.push = function (e) {
-         this.array_.push(e);
-         return e
-       };
+         var _newFeature;
 
-       /**
-        * Pushes an item onto the top of this stack.
-        * @param {Object} e
-        * @return {Object}
-        */
-       Stack.prototype.pop = function (e) {
-         if (this.array_.length === 0) {
-           throw new EmptyStackException()
-         }
+         var _sections;
 
-         return this.array_.pop()
-       };
+         function entityEditor(selection) {
+           var combinedTags = utilCombinedTags(_entityIDs, context.graph()); // Header
 
-       /**
-        * Looks at the object at the top of this stack without removing it from the
-        * stack.
-        * @return {Object}
-        */
-       Stack.prototype.peek = function () {
-         if (this.array_.length === 0) {
-           throw new EmptyStackException()
-         }
+           var header = selection.selectAll('.header').data([0]); // Enter
 
-         return this.array_[this.array_.length - 1]
-       };
+           var headerEnter = header.enter().append('div').attr('class', 'header fillL');
+           headerEnter.append('button').attr('class', 'preset-reset preset-choose').call(svgIcon(_mainLocalizer.textDirection() === 'rtl' ? '#iD-icon-forward' : '#iD-icon-backward'));
+           headerEnter.append('button').attr('class', 'close').on('click', function () {
+             context.enter(modeBrowse(context));
+           }).call(svgIcon(_modified ? '#iD-icon-apply' : '#iD-icon-close'));
+           headerEnter.append('h3'); // Update
 
-       /**
-        * Tests if this stack is empty.
-        * @return {boolean} true if and only if this stack contains no items; false
-        *         otherwise.
-        */
-       Stack.prototype.empty = function () {
-         if (this.array_.length === 0) {
-           return true
-         } else {
-           return false
-         }
-       };
+           header = header.merge(headerEnter);
+           header.selectAll('h3').html(_entityIDs.length === 1 ? _t.html('inspector.edit') : _t.html('inspector.edit_features'));
+           header.selectAll('.preset-reset').on('click', function () {
+             dispatch$1.call('choose', this, _activePresets);
+           }); // Body
 
-       /**
-        * @return {boolean}
-        */
-       Stack.prototype.isEmpty = function () {
-         return this.empty()
-       };
+           var body = selection.selectAll('.inspector-body').data([0]); // Enter
 
-       /**
-        * Returns the 1-based position where an object is on this stack. If the object
-        * o occurs as an item in this stack, this method returns the distance from the
-        * top of the stack of the occurrence nearest the top of the stack; the topmost
-        * item on the stack is considered to be at distance 1. The equals method is
-        * used to compare o to the items in this stack.
-        *
-        * NOTE: does not currently actually use equals. (=== is used)
-        *
-        * @param {Object} o
-        * @return {number} the 1-based position from the top of the stack where the
-        *         object is located; the return value -1 indicates that the object is
-        *         not on the stack.
-        */
-       Stack.prototype.search = function (o) {
-         return this.array_.indexOf(o)
-       };
+           var bodyEnter = body.enter().append('div').attr('class', 'entity-editor inspector-body sep-top'); // Update
 
-       /**
-        * @return {number}
-        * @export
-        */
-       Stack.prototype.size = function () {
-         return this.array_.length
-       };
+           body = body.merge(bodyEnter);
 
-       /**
-        * @return {Array}
-        */
-       Stack.prototype.toArray = function () {
-         var this$1 = this;
+           if (!_sections) {
+             _sections = [uiSectionSelectionList(context), uiSectionFeatureType(context).on('choose', function (presets) {
+               dispatch$1.call('choose', this, presets);
+             }), uiSectionEntityIssues(context), uiSectionPresetFields(context).on('change', changeTags).on('revert', revertTags), uiSectionRawTagEditor('raw-tag-editor', context).on('change', changeTags), uiSectionRawMemberEditor(context), uiSectionRawMembershipEditor(context)];
+           }
 
-         var array = [];
+           _sections.forEach(function (section) {
+             if (section.entityIDs) {
+               section.entityIDs(_entityIDs);
+             }
 
-         for (var i = 0, len = this.array_.length; i < len; i++) {
-           array.push(this$1.array_[i]);
-         }
+             if (section.presets) {
+               section.presets(_activePresets);
+             }
 
-         return array
-       };
+             if (section.tags) {
+               section.tags(combinedTags);
+             }
 
-       var RightmostEdgeFinder = function RightmostEdgeFinder () {
-         this._minIndex = -1;
-         this._minCoord = null;
-         this._minDe = null;
-         this._orientedDe = null;
-       };
-       RightmostEdgeFinder.prototype.getCoordinate = function getCoordinate () {
-         return this._minCoord
-       };
-       RightmostEdgeFinder.prototype.getRightmostSide = function getRightmostSide (de, index) {
-         var side = this.getRightmostSideOfSegment(de, index);
-         if (side < 0) { side = this.getRightmostSideOfSegment(de, index - 1); }
-         if (side < 0) {
-           this._minCoord = null;
-           this.checkForRightmostCoordinate(de);
-         }
-         return side
-       };
-       RightmostEdgeFinder.prototype.findRightmostEdgeAtVertex = function findRightmostEdgeAtVertex () {
-         var pts = this._minDe.getEdge().getCoordinates();
-         Assert.isTrue(this._minIndex > 0 && this._minIndex < pts.length, 'rightmost point expected to be interior vertex of edge');
-         var pPrev = pts[this._minIndex - 1];
-         var pNext = pts[this._minIndex + 1];
-         var orientation = CGAlgorithms.computeOrientation(this._minCoord, pNext, pPrev);
-         var usePrev = false;
-         if (pPrev.y < this._minCoord.y && pNext.y < this._minCoord.y && orientation === CGAlgorithms.COUNTERCLOCKWISE) {
-           usePrev = true;
-         } else if (pPrev.y > this._minCoord.y && pNext.y > this._minCoord.y && orientation === CGAlgorithms.CLOCKWISE) {
-           usePrev = true;
-         }
-         if (usePrev) {
-           this._minIndex = this._minIndex - 1;
-         }
-       };
-       RightmostEdgeFinder.prototype.getRightmostSideOfSegment = function getRightmostSideOfSegment (de, i) {
-         var e = de.getEdge();
-         var coord = e.getCoordinates();
-         if (i < 0 || i + 1 >= coord.length) { return -1 }
-         if (coord[i].y === coord[i + 1].y) { return -1 }
-         var pos = Position.LEFT;
-         if (coord[i].y < coord[i + 1].y) { pos = Position.RIGHT; }
-         return pos
-       };
-       RightmostEdgeFinder.prototype.getEdge = function getEdge () {
-         return this._orientedDe
-       };
-       RightmostEdgeFinder.prototype.checkForRightmostCoordinate = function checkForRightmostCoordinate (de) {
-           var this$1 = this;
+             if (section.state) {
+               section.state(_state);
+             }
 
-         var coord = de.getEdge().getCoordinates();
-         for (var i = 0; i < coord.length - 1; i++) {
-           if (this$1._minCoord === null || coord[i].x > this$1._minCoord.x) {
-             this$1._minDe = de;
-             this$1._minIndex = i;
-             this$1._minCoord = coord[i];
-           }
-         }
-       };
-       RightmostEdgeFinder.prototype.findRightmostEdgeAtNode = function findRightmostEdgeAtNode () {
-         var node = this._minDe.getNode();
-         var star = node.getEdges();
-         this._minDe = star.getRightmostEdge();
-         if (!this._minDe.isForward()) {
-           this._minDe = this._minDe.getSym();
-           this._minIndex = this._minDe.getEdge().getCoordinates().length - 1;
-         }
-       };
-       RightmostEdgeFinder.prototype.findEdge = function findEdge (dirEdgeList) {
-           var this$1 = this;
+             body.call(section.render);
+           });
 
-         for (var i = dirEdgeList.iterator(); i.hasNext();) {
-           var de = i.next();
-           if (!de.isForward()) { continue }
-           this$1.checkForRightmostCoordinate(de);
-         }
-         Assert.isTrue(this._minIndex !== 0 || this._minCoord.equals(this._minDe.getCoordinate()), 'inconsistency in rightmost processing');
-         if (this._minIndex === 0) {
-           this.findRightmostEdgeAtNode();
-         } else {
-           this.findRightmostEdgeAtVertex();
-         }
-         this._orientedDe = this._minDe;
-         var rightmostSide = this.getRightmostSide(this._minDe, this._minIndex);
-         if (rightmostSide === Position.LEFT) {
-           this._orientedDe = this._minDe.getSym();
-         }
-       };
-       RightmostEdgeFinder.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       RightmostEdgeFinder.prototype.getClass = function getClass () {
-         return RightmostEdgeFinder
-       };
+           context.history().on('change.entity-editor', historyChanged);
 
-       var TopologyException = (function (RuntimeException$$1) {
-         function TopologyException (msg, pt) {
-           RuntimeException$$1.call(this, TopologyException.msgWithCoord(msg, pt));
-           this.pt = pt ? new Coordinate(pt) : null;
-           this.name = 'TopologyException';
-         }
+           function historyChanged(difference) {
+             if (selection.selectAll('.entity-editor').empty()) return;
+             if (_state === 'hide') return;
+             var significant = !difference || difference.didChange.properties || difference.didChange.addition || difference.didChange.deletion;
+             if (!significant) return;
+             _entityIDs = _entityIDs.filter(context.hasEntity);
+             if (!_entityIDs.length) return;
+             var priorActivePreset = _activePresets.length === 1 && _activePresets[0];
+             loadActivePresets();
+             var graph = context.graph();
+             entityEditor.modified(_base !== graph);
+             entityEditor(selection);
 
-         if ( RuntimeException$$1 ) TopologyException.__proto__ = RuntimeException$$1;
-         TopologyException.prototype = Object.create( RuntimeException$$1 && RuntimeException$$1.prototype );
-         TopologyException.prototype.constructor = TopologyException;
-         TopologyException.prototype.getCoordinate = function getCoordinate () {
-           return this.pt
-         };
-         TopologyException.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         TopologyException.prototype.getClass = function getClass () {
-           return TopologyException
-         };
-         TopologyException.msgWithCoord = function msgWithCoord (msg, pt) {
-           if (!pt) { return msg + ' [ ' + pt + ' ]' }
-           return msg
-         };
+             if (priorActivePreset && _activePresets.length === 1 && priorActivePreset !== _activePresets[0]) {
+               // flash the button to indicate the preset changed
+               context.container().selectAll('.entity-editor button.preset-reset .label').style('background-color', '#fff').transition().duration(750).style('background-color', null);
+             }
+           }
+         } // Tag changes that fire on input can all get coalesced into a single
+         // history operation when the user leaves the field.  #2342
+         // Use explicit entityIDs in case the selection changes before the event is fired.
 
-         return TopologyException;
-       }(RuntimeException));
 
-       var LinkedList = function LinkedList () {
-         this.array_ = [];
-       };
-       LinkedList.prototype.addLast = function addLast (e) {
-         this.array_.push(e);
-       };
-       LinkedList.prototype.removeFirst = function removeFirst () {
-         return this.array_.shift()
-       };
-       LinkedList.prototype.isEmpty = function isEmpty () {
-         return this.array_.length === 0
-       };
+         function changeTags(entityIDs, changed, onInput) {
+           var actions = [];
 
-       var BufferSubgraph = function BufferSubgraph () {
-         this._finder = null;
-         this._dirEdgeList = new ArrayList();
-         this._nodes = new ArrayList();
-         this._rightMostCoord = null;
-         this._env = null;
-         this._finder = new RightmostEdgeFinder();
-       };
-       BufferSubgraph.prototype.clearVisitedEdges = function clearVisitedEdges () {
-         for (var it = this._dirEdgeList.iterator(); it.hasNext();) {
-           var de = it.next();
-           de.setVisited(false);
-         }
-       };
-       BufferSubgraph.prototype.getRightmostCoordinate = function getRightmostCoordinate () {
-         return this._rightMostCoord
-       };
-       BufferSubgraph.prototype.computeNodeDepth = function computeNodeDepth (n) {
-           var this$1 = this;
+           for (var i in entityIDs) {
+             var entityID = entityIDs[i];
+             var entity = context.entity(entityID);
+             var tags = Object.assign({}, entity.tags); // shallow copy
 
-         var startEdge = null;
-         for (var i = n.getEdges().iterator(); i.hasNext();) {
-           var de = i.next();
-           if (de.isVisited() || de.getSym().isVisited()) {
-             startEdge = de;
-             break
-           }
-         }
-         if (startEdge === null) { throw new TopologyException('unable to find edge to compute depths at ' + n.getCoordinate()) }
-         n.getEdges().computeDepths(startEdge);
-         for (var i$1 = n.getEdges().iterator(); i$1.hasNext();) {
-           var de$1 = i$1.next();
-           de$1.setVisited(true);
-           this$1.copySymDepths(de$1);
-         }
-       };
-       BufferSubgraph.prototype.computeDepth = function computeDepth (outsideDepth) {
-         this.clearVisitedEdges();
-         var de = this._finder.getEdge();
-         // const n = de.getNode()
-         // const label = de.getLabel()
-         de.setEdgeDepths(Position.RIGHT, outsideDepth);
-         this.copySymDepths(de);
-         this.computeDepths(de);
-       };
-       BufferSubgraph.prototype.create = function create (node) {
-         this.addReachable(node);
-         this._finder.findEdge(this._dirEdgeList);
-         this._rightMostCoord = this._finder.getCoordinate();
-       };
-       BufferSubgraph.prototype.findResultEdges = function findResultEdges () {
-         for (var it = this._dirEdgeList.iterator(); it.hasNext();) {
-           var de = it.next();
-           if (de.getDepth(Position.RIGHT) >= 1 && de.getDepth(Position.LEFT) <= 0 && !de.isInteriorAreaEdge()) {
-             de.setInResult(true);
-           }
-         }
-       };
-       BufferSubgraph.prototype.computeDepths = function computeDepths (startEdge) {
-           var this$1 = this;
-
-         var nodesVisited = new HashSet();
-         var nodeQueue = new LinkedList();
-         var startNode = startEdge.getNode();
-         nodeQueue.addLast(startNode);
-         nodesVisited.add(startNode);
-         startEdge.setVisited(true);
-         while (!nodeQueue.isEmpty()) {
-           var n = nodeQueue.removeFirst();
-           nodesVisited.add(n);
-           this$1.computeNodeDepth(n);
-           for (var i = n.getEdges().iterator(); i.hasNext();) {
-             var de = i.next();
-             var sym = de.getSym();
-             if (sym.isVisited()) { continue }
-             var adjNode = sym.getNode();
-             if (!nodesVisited.contains(adjNode)) {
-               nodeQueue.addLast(adjNode);
-               nodesVisited.add(adjNode);
-             }
-           }
-         }
-       };
-       BufferSubgraph.prototype.compareTo = function compareTo (o) {
-         var graph = o;
-         if (this._rightMostCoord.x < graph._rightMostCoord.x) {
-           return -1
-         }
-         if (this._rightMostCoord.x > graph._rightMostCoord.x) {
-           return 1
-         }
-         return 0
-       };
-       BufferSubgraph.prototype.getEnvelope = function getEnvelope () {
-         if (this._env === null) {
-           var edgeEnv = new Envelope();
-           for (var it = this._dirEdgeList.iterator(); it.hasNext();) {
-             var dirEdge = it.next();
-             var pts = dirEdge.getEdge().getCoordinates();
-             for (var i = 0; i < pts.length - 1; i++) {
-               edgeEnv.expandToInclude(pts[i]);
-             }
-           }
-           this._env = edgeEnv;
-         }
-         return this._env
-       };
-       BufferSubgraph.prototype.addReachable = function addReachable (startNode) {
-           var this$1 = this;
+             for (var k in changed) {
+               if (!k) continue;
+               var v = changed[k];
 
-         var nodeStack = new Stack();
-         nodeStack.add(startNode);
-         while (!nodeStack.empty()) {
-           var node = nodeStack.pop();
-           this$1.add(node, nodeStack);
-         }
-       };
-       BufferSubgraph.prototype.copySymDepths = function copySymDepths (de) {
-         var sym = de.getSym();
-         sym.setDepth(Position.LEFT, de.getDepth(Position.RIGHT));
-         sym.setDepth(Position.RIGHT, de.getDepth(Position.LEFT));
-       };
-       BufferSubgraph.prototype.add = function add (node, nodeStack) {
-           var this$1 = this;
-
-         node.setVisited(true);
-         this._nodes.add(node);
-         for (var i = node.getEdges().iterator(); i.hasNext();) {
-           var de = i.next();
-           this$1._dirEdgeList.add(de);
-           var sym = de.getSym();
-           var symNode = sym.getNode();
-           if (!symNode.isVisited()) { nodeStack.push(symNode); }
-         }
-       };
-       BufferSubgraph.prototype.getNodes = function getNodes () {
-         return this._nodes
-       };
-       BufferSubgraph.prototype.getDirectedEdges = function getDirectedEdges () {
-         return this._dirEdgeList
-       };
-       BufferSubgraph.prototype.interfaces_ = function interfaces_ () {
-         return [Comparable]
-       };
-       BufferSubgraph.prototype.getClass = function getClass () {
-         return BufferSubgraph
-       };
+               if (v !== undefined || tags.hasOwnProperty(k)) {
+                 tags[k] = v;
+               }
+             }
 
-       var TopologyLocation = function TopologyLocation () {
-         var this$1 = this;
+             if (!onInput) {
+               tags = utilCleanTags(tags);
+             }
 
-         this.location = null;
-         if (arguments.length === 1) {
-           if (arguments[0] instanceof Array) {
-             var location = arguments[0];
-             this.init(location.length);
-           } else if (Number.isInteger(arguments[0])) {
-             var on = arguments[0];
-             this.init(1);
-             this.location[Position.ON] = on;
-           } else if (arguments[0] instanceof TopologyLocation) {
-             var gl = arguments[0];
-             this.init(gl.location.length);
-             if (gl !== null) {
-               for (var i = 0; i < this.location.length; i++) {
-                 this$1.location[i] = gl.location[i];
-               }
-             }
-           }
-         } else if (arguments.length === 3) {
-           var on$1 = arguments[0];
-           var left = arguments[1];
-           var right = arguments[2];
-           this.init(3);
-           this.location[Position.ON] = on$1;
-           this.location[Position.LEFT] = left;
-           this.location[Position.RIGHT] = right;
-         }
-       };
-       TopologyLocation.prototype.setAllLocations = function setAllLocations (locValue) {
-           var this$1 = this;
+             if (!fastDeepEqual(entity.tags, tags)) {
+               actions.push(actionChangeTags(entityID, tags));
+             }
+           }
 
-         for (var i = 0; i < this.location.length; i++) {
-           this$1.location[i] = locValue;
-         }
-       };
-       TopologyLocation.prototype.isNull = function isNull () {
-           var this$1 = this;
+           if (actions.length) {
+             var combinedAction = function combinedAction(graph) {
+               actions.forEach(function (action) {
+                 graph = action(graph);
+               });
+               return graph;
+             };
 
-         for (var i = 0; i < this.location.length; i++) {
-           if (this$1.location[i] !== Location.NONE) { return false }
-         }
-         return true
-       };
-       TopologyLocation.prototype.setAllLocationsIfNull = function setAllLocationsIfNull (locValue) {
-           var this$1 = this;
+             var annotation = _t('operations.change_tags.annotation');
 
-         for (var i = 0; i < this.location.length; i++) {
-           if (this$1.location[i] === Location.NONE) { this$1.location[i] = locValue; }
-         }
-       };
-       TopologyLocation.prototype.isLine = function isLine () {
-         return this.location.length === 1
-       };
-       TopologyLocation.prototype.merge = function merge (gl) {
-           var this$1 = this;
+             if (_coalesceChanges) {
+               context.overwrite(combinedAction, annotation);
+             } else {
+               context.perform(combinedAction, annotation);
+               _coalesceChanges = !!onInput;
+             }
+           } // if leaving field (blur event), rerun validation
 
-         if (gl.location.length > this.location.length) {
-           var newLoc = new Array(3).fill(null);
-           newLoc[Position.ON] = this.location[Position.ON];
-           newLoc[Position.LEFT] = Location.NONE;
-           newLoc[Position.RIGHT] = Location.NONE;
-           this.location = newLoc;
-         }
-         for (var i = 0; i < this.location.length; i++) {
-           if (this$1.location[i] === Location.NONE && i < gl.location.length) { this$1.location[i] = gl.location[i]; }
-         }
-       };
-       TopologyLocation.prototype.getLocations = function getLocations () {
-         return this.location
-       };
-       TopologyLocation.prototype.flip = function flip () {
-         if (this.location.length <= 1) { return null }
-         var temp = this.location[Position.LEFT];
-         this.location[Position.LEFT] = this.location[Position.RIGHT];
-         this.location[Position.RIGHT] = temp;
-       };
-       TopologyLocation.prototype.toString = function toString () {
-         var buf = new StringBuffer();
-         if (this.location.length > 1) { buf.append(Location.toLocationSymbol(this.location[Position.LEFT])); }
-         buf.append(Location.toLocationSymbol(this.location[Position.ON]));
-         if (this.location.length > 1) { buf.append(Location.toLocationSymbol(this.location[Position.RIGHT])); }
-         return buf.toString()
-       };
-       TopologyLocation.prototype.setLocations = function setLocations (on, left, right) {
-         this.location[Position.ON] = on;
-         this.location[Position.LEFT] = left;
-         this.location[Position.RIGHT] = right;
-       };
-       TopologyLocation.prototype.get = function get (posIndex) {
-         if (posIndex < this.location.length) { return this.location[posIndex] }
-         return Location.NONE
-       };
-       TopologyLocation.prototype.isArea = function isArea () {
-         return this.location.length > 1
-       };
-       TopologyLocation.prototype.isAnyNull = function isAnyNull () {
-           var this$1 = this;
 
-         for (var i = 0; i < this.location.length; i++) {
-           if (this$1.location[i] === Location.NONE) { return true }
-         }
-         return false
-       };
-       TopologyLocation.prototype.setLocation = function setLocation () {
-         if (arguments.length === 1) {
-           var locValue = arguments[0];
-           this.setLocation(Position.ON, locValue);
-         } else if (arguments.length === 2) {
-           var locIndex = arguments[0];
-           var locValue$1 = arguments[1];
-           this.location[locIndex] = locValue$1;
+           if (!onInput) {
+             context.validator().validate();
+           }
          }
-       };
-       TopologyLocation.prototype.init = function init (size) {
-         this.location = new Array(size).fill(null);
-         this.setAllLocations(Location.NONE);
-       };
-       TopologyLocation.prototype.isEqualOnSide = function isEqualOnSide (le, locIndex) {
-         return this.location[locIndex] === le.location[locIndex]
-       };
-       TopologyLocation.prototype.allPositionsEqual = function allPositionsEqual (loc) {
-           var this$1 = this;
 
-         for (var i = 0; i < this.location.length; i++) {
-           if (this$1.location[i] !== loc) { return false }
-         }
-         return true
-       };
-       TopologyLocation.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       TopologyLocation.prototype.getClass = function getClass () {
-         return TopologyLocation
-       };
+         function revertTags(keys) {
+           var actions = [];
 
-       var Label = function Label () {
-         this.elt = new Array(2).fill(null);
-         if (arguments.length === 1) {
-           if (Number.isInteger(arguments[0])) {
-             var onLoc = arguments[0];
-             this.elt[0] = new TopologyLocation(onLoc);
-             this.elt[1] = new TopologyLocation(onLoc);
-           } else if (arguments[0] instanceof Label) {
-             var lbl = arguments[0];
-             this.elt[0] = new TopologyLocation(lbl.elt[0]);
-             this.elt[1] = new TopologyLocation(lbl.elt[1]);
-           }
-         } else if (arguments.length === 2) {
-           var geomIndex = arguments[0];
-           var onLoc$1 = arguments[1];
-           this.elt[0] = new TopologyLocation(Location.NONE);
-           this.elt[1] = new TopologyLocation(Location.NONE);
-           this.elt[geomIndex].setLocation(onLoc$1);
-         } else if (arguments.length === 3) {
-           var onLoc$2 = arguments[0];
-           var leftLoc = arguments[1];
-           var rightLoc = arguments[2];
-           this.elt[0] = new TopologyLocation(onLoc$2, leftLoc, rightLoc);
-           this.elt[1] = new TopologyLocation(onLoc$2, leftLoc, rightLoc);
-         } else if (arguments.length === 4) {
-           var geomIndex$1 = arguments[0];
-           var onLoc$3 = arguments[1];
-           var leftLoc$1 = arguments[2];
-           var rightLoc$1 = arguments[3];
-           this.elt[0] = new TopologyLocation(Location.NONE, Location.NONE, Location.NONE);
-           this.elt[1] = new TopologyLocation(Location.NONE, Location.NONE, Location.NONE);
-           this.elt[geomIndex$1].setLocations(onLoc$3, leftLoc$1, rightLoc$1);
-         }
-       };
-       Label.prototype.getGeometryCount = function getGeometryCount () {
-         var count = 0;
-         if (!this.elt[0].isNull()) { count++; }
-         if (!this.elt[1].isNull()) { count++; }
-         return count
-       };
-       Label.prototype.setAllLocations = function setAllLocations (geomIndex, location) {
-         this.elt[geomIndex].setAllLocations(location);
-       };
-       Label.prototype.isNull = function isNull (geomIndex) {
-         return this.elt[geomIndex].isNull()
-       };
-       Label.prototype.setAllLocationsIfNull = function setAllLocationsIfNull () {
-         if (arguments.length === 1) {
-           var location = arguments[0];
-           this.setAllLocationsIfNull(0, location);
-           this.setAllLocationsIfNull(1, location);
-         } else if (arguments.length === 2) {
-           var geomIndex = arguments[0];
-           var location$1 = arguments[1];
-           this.elt[geomIndex].setAllLocationsIfNull(location$1);
-         }
-       };
-       Label.prototype.isLine = function isLine (geomIndex) {
-         return this.elt[geomIndex].isLine()
-       };
-       Label.prototype.merge = function merge (lbl) {
-           var this$1 = this;
+           for (var i in _entityIDs) {
+             var entityID = _entityIDs[i];
+             var original = context.graph().base().entities[entityID];
+             var changed = {};
 
-         for (var i = 0; i < 2; i++) {
-           if (this$1.elt[i] === null && lbl.elt[i] !== null) {
-             this$1.elt[i] = new TopologyLocation(lbl.elt[i]);
-           } else {
-             this$1.elt[i].merge(lbl.elt[i]);
-           }
-         }
-       };
-       Label.prototype.flip = function flip () {
-         this.elt[0].flip();
-         this.elt[1].flip();
-       };
-       Label.prototype.getLocation = function getLocation () {
-         if (arguments.length === 1) {
-           var geomIndex = arguments[0];
-           return this.elt[geomIndex].get(Position.ON)
-         } else if (arguments.length === 2) {
-           var geomIndex$1 = arguments[0];
-           var posIndex = arguments[1];
-           return this.elt[geomIndex$1].get(posIndex)
-         }
-       };
-       Label.prototype.toString = function toString () {
-         var buf = new StringBuffer();
-         if (this.elt[0] !== null) {
-           buf.append('A:');
-           buf.append(this.elt[0].toString());
-         }
-         if (this.elt[1] !== null) {
-           buf.append(' B:');
-           buf.append(this.elt[1].toString());
-         }
-         return buf.toString()
-       };
-       Label.prototype.isArea = function isArea () {
-         if (arguments.length === 0) {
-           return this.elt[0].isArea() || this.elt[1].isArea()
-         } else if (arguments.length === 1) {
-           var geomIndex = arguments[0];
-           return this.elt[geomIndex].isArea()
-         }
-       };
-       Label.prototype.isAnyNull = function isAnyNull (geomIndex) {
-         return this.elt[geomIndex].isAnyNull()
-       };
-       Label.prototype.setLocation = function setLocation () {
-         if (arguments.length === 2) {
-           var geomIndex = arguments[0];
-           var location = arguments[1];
-           this.elt[geomIndex].setLocation(Position.ON, location);
-         } else if (arguments.length === 3) {
-           var geomIndex$1 = arguments[0];
-           var posIndex = arguments[1];
-           var location$1 = arguments[2];
-           this.elt[geomIndex$1].setLocation(posIndex, location$1);
-         }
-       };
-       Label.prototype.isEqualOnSide = function isEqualOnSide (lbl, side) {
-         return this.elt[0].isEqualOnSide(lbl.elt[0], side) && this.elt[1].isEqualOnSide(lbl.elt[1], side)
-       };
-       Label.prototype.allPositionsEqual = function allPositionsEqual (geomIndex, loc) {
-         return this.elt[geomIndex].allPositionsEqual(loc)
-       };
-       Label.prototype.toLine = function toLine (geomIndex) {
-         if (this.elt[geomIndex].isArea()) { this.elt[geomIndex] = new TopologyLocation(this.elt[geomIndex].location[0]); }
-       };
-       Label.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       Label.prototype.getClass = function getClass () {
-         return Label
-       };
-       Label.toLineLabel = function toLineLabel (label) {
-         var lineLabel = new Label(Location.NONE);
-         for (var i = 0; i < 2; i++) {
-           lineLabel.setLocation(i, label.getLocation(i));
-         }
-         return lineLabel
-       };
+             for (var j in keys) {
+               var key = keys[j];
+               changed[key] = original ? original.tags[key] : undefined;
+             }
 
-       var EdgeRing = function EdgeRing () {
-         this._startDe = null;
-         this._maxNodeDegree = -1;
-         this._edges = new ArrayList();
-         this._pts = new ArrayList();
-         this._label = new Label(Location.NONE);
-         this._ring = null;
-         this._isHole = null;
-         this._shell = null;
-         this._holes = new ArrayList();
-         this._geometryFactory = null;
-         var start = arguments[0];
-         var geometryFactory = arguments[1];
-         this._geometryFactory = geometryFactory;
-         this.computePoints(start);
-         this.computeRing();
-       };
-       EdgeRing.prototype.computeRing = function computeRing () {
-           var this$1 = this;
+             var entity = context.entity(entityID);
+             var tags = Object.assign({}, entity.tags); // shallow copy
 
-         if (this._ring !== null) { return null }
-         var coord = new Array(this._pts.size()).fill(null);
-         for (var i = 0; i < this._pts.size(); i++) {
-           coord[i] = this$1._pts.get(i);
-         }
-         this._ring = this._geometryFactory.createLinearRing(coord);
-         this._isHole = CGAlgorithms.isCCW(this._ring.getCoordinates());
-       };
-       EdgeRing.prototype.isIsolated = function isIsolated () {
-         return this._label.getGeometryCount() === 1
-       };
-       EdgeRing.prototype.computePoints = function computePoints (start) {
-           var this$1 = this;
+             for (var k in changed) {
+               if (!k) continue;
+               var v = changed[k];
 
-         this._startDe = start;
-         var de = start;
-         var isFirstEdge = true;
-         do {
-           if (de === null) { throw new TopologyException('Found null DirectedEdge') }
-           if (de.getEdgeRing() === this$1) { throw new TopologyException('Directed Edge visited twice during ring-building at ' + de.getCoordinate()) }
-           this$1._edges.add(de);
-           var label = de.getLabel();
-           Assert.isTrue(label.isArea());
-           this$1.mergeLabel(label);
-           this$1.addPoints(de.getEdge(), de.isForward(), isFirstEdge);
-           isFirstEdge = false;
-           this$1.setEdgeRing(de, this$1);
-           de = this$1.getNext(de);
-         } while (de !== this._startDe)
-       };
-       EdgeRing.prototype.getLinearRing = function getLinearRing () {
-         return this._ring
-       };
-       EdgeRing.prototype.getCoordinate = function getCoordinate (i) {
-         return this._pts.get(i)
-       };
-       EdgeRing.prototype.computeMaxNodeDegree = function computeMaxNodeDegree () {
-           var this$1 = this;
+               if (v !== undefined || tags.hasOwnProperty(k)) {
+                 tags[k] = v;
+               }
+             }
 
-         this._maxNodeDegree = 0;
-         var de = this._startDe;
-         do {
-           var node = de.getNode();
-           var degree = node.getEdges().getOutgoingDegree(this$1);
-           if (degree > this$1._maxNodeDegree) { this$1._maxNodeDegree = degree; }
-           de = this$1.getNext(de);
-         } while (de !== this._startDe)
-         this._maxNodeDegree *= 2;
-       };
-       EdgeRing.prototype.addPoints = function addPoints (edge, isForward, isFirstEdge) {
-           var this$1 = this;
+             tags = utilCleanTags(tags);
 
-         var edgePts = edge.getCoordinates();
-         if (isForward) {
-           var startIndex = 1;
-           if (isFirstEdge) { startIndex = 0; }
-           for (var i = startIndex; i < edgePts.length; i++) {
-             this$1._pts.add(edgePts[i]);
-           }
-         } else {
-           var startIndex$1 = edgePts.length - 2;
-           if (isFirstEdge) { startIndex$1 = edgePts.length - 1; }
-           for (var i$1 = startIndex$1; i$1 >= 0; i$1--) {
-             this$1._pts.add(edgePts[i$1]);
-           }
-         }
-       };
-       EdgeRing.prototype.isHole = function isHole () {
-         return this._isHole
-       };
-       EdgeRing.prototype.setInResult = function setInResult () {
-         var de = this._startDe;
-         do {
-           de.getEdge().setInResult(true);
-           de = de.getNext();
-         } while (de !== this._startDe)
-       };
-       EdgeRing.prototype.containsPoint = function containsPoint (p) {
-         var shell = this.getLinearRing();
-         var env = shell.getEnvelopeInternal();
-         if (!env.contains(p)) { return false }
-         if (!CGAlgorithms.isPointInRing(p, shell.getCoordinates())) { return false }
-         for (var i = this._holes.iterator(); i.hasNext();) {
-           var hole = i.next();
-           if (hole.containsPoint(p)) { return false }
-         }
-         return true
-       };
-       EdgeRing.prototype.addHole = function addHole (ring) {
-         this._holes.add(ring);
-       };
-       EdgeRing.prototype.isShell = function isShell () {
-         return this._shell === null
-       };
-       EdgeRing.prototype.getLabel = function getLabel () {
-         return this._label
-       };
-       EdgeRing.prototype.getEdges = function getEdges () {
-         return this._edges
-       };
-       EdgeRing.prototype.getMaxNodeDegree = function getMaxNodeDegree () {
-         if (this._maxNodeDegree < 0) { this.computeMaxNodeDegree(); }
-         return this._maxNodeDegree
-       };
-       EdgeRing.prototype.getShell = function getShell () {
-         return this._shell
-       };
-       EdgeRing.prototype.mergeLabel = function mergeLabel () {
-         if (arguments.length === 1) {
-           var deLabel = arguments[0];
-           this.mergeLabel(deLabel, 0);
-           this.mergeLabel(deLabel, 1);
-         } else if (arguments.length === 2) {
-           var deLabel$1 = arguments[0];
-           var geomIndex = arguments[1];
-           var loc = deLabel$1.getLocation(geomIndex, Position.RIGHT);
-           if (loc === Location.NONE) { return null }
-           if (this._label.getLocation(geomIndex) === Location.NONE) {
-             this._label.setLocation(geomIndex, loc);
-             return null
+             if (!fastDeepEqual(entity.tags, tags)) {
+               actions.push(actionChangeTags(entityID, tags));
+             }
            }
-         }
-       };
-       EdgeRing.prototype.setShell = function setShell (shell) {
-         this._shell = shell;
-         if (shell !== null) { shell.addHole(this); }
-       };
-       EdgeRing.prototype.toPolygon = function toPolygon (geometryFactory) {
-           var this$1 = this;
 
-         var holeLR = new Array(this._holes.size()).fill(null);
-         for (var i = 0; i < this._holes.size(); i++) {
-           holeLR[i] = this$1._holes.get(i).getLinearRing();
-         }
-         var poly = geometryFactory.createPolygon(this.getLinearRing(), holeLR);
-         return poly
-       };
-       EdgeRing.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       EdgeRing.prototype.getClass = function getClass () {
-         return EdgeRing
-       };
+           if (actions.length) {
+             var combinedAction = function combinedAction(graph) {
+               actions.forEach(function (action) {
+                 graph = action(graph);
+               });
+               return graph;
+             };
+
+             var annotation = _t('operations.change_tags.annotation');
+
+             if (_coalesceChanges) {
+               context.overwrite(combinedAction, annotation);
+             } else {
+               context.perform(combinedAction, annotation);
+               _coalesceChanges = false;
+             }
+           }
 
-       var MinimalEdgeRing = (function (EdgeRing$$1) {
-         function MinimalEdgeRing () {
-           var start = arguments[0];
-           var geometryFactory = arguments[1];
-           EdgeRing$$1.call(this, start, geometryFactory);
+           context.validator().validate();
          }
 
-         if ( EdgeRing$$1 ) MinimalEdgeRing.__proto__ = EdgeRing$$1;
-         MinimalEdgeRing.prototype = Object.create( EdgeRing$$1 && EdgeRing$$1.prototype );
-         MinimalEdgeRing.prototype.constructor = MinimalEdgeRing;
-         MinimalEdgeRing.prototype.setEdgeRing = function setEdgeRing (de, er) {
-           de.setMinEdgeRing(er);
+         entityEditor.modified = function (val) {
+           if (!arguments.length) return _modified;
+           _modified = val;
+           return entityEditor;
          };
-         MinimalEdgeRing.prototype.getNext = function getNext (de) {
-           return de.getNextMin()
-         };
-         MinimalEdgeRing.prototype.interfaces_ = function interfaces_ () {
-           return []
+
+         entityEditor.state = function (val) {
+           if (!arguments.length) return _state;
+           _state = val;
+           return entityEditor;
          };
-         MinimalEdgeRing.prototype.getClass = function getClass () {
-           return MinimalEdgeRing
+
+         entityEditor.entityIDs = function (val) {
+           if (!arguments.length) return _entityIDs;
+           if (val && _entityIDs && utilArrayIdentical(_entityIDs, val)) return entityEditor; // exit early if no change
+
+           _entityIDs = val;
+           _base = context.graph();
+           _coalesceChanges = false;
+           loadActivePresets(true);
+           return entityEditor.modified(false);
          };
 
-         return MinimalEdgeRing;
-       }(EdgeRing));
+         entityEditor.newFeature = function (val) {
+           if (!arguments.length) return _newFeature;
+           _newFeature = val;
+           return entityEditor;
+         };
 
-       var MaximalEdgeRing = (function (EdgeRing$$1) {
-         function MaximalEdgeRing () {
-           var start = arguments[0];
-           var geometryFactory = arguments[1];
-           EdgeRing$$1.call(this, start, geometryFactory);
-         }
+         function loadActivePresets(isForNewSelection) {
+           var graph = context.graph();
+           var counts = {};
 
-         if ( EdgeRing$$1 ) MaximalEdgeRing.__proto__ = EdgeRing$$1;
-         MaximalEdgeRing.prototype = Object.create( EdgeRing$$1 && EdgeRing$$1.prototype );
-         MaximalEdgeRing.prototype.constructor = MaximalEdgeRing;
-         MaximalEdgeRing.prototype.buildMinimalRings = function buildMinimalRings () {
-           var this$1 = this;
+           for (var i in _entityIDs) {
+             var entity = graph.hasEntity(_entityIDs[i]);
+             if (!entity) return;
+             var match = _mainPresetIndex.match(entity, graph);
+             if (!counts[match.id]) counts[match.id] = 0;
+             counts[match.id] += 1;
+           }
 
-           var minEdgeRings = new ArrayList();
-           var de = this._startDe;
-           do {
-             if (de.getMinEdgeRing() === null) {
-               var minEr = new MinimalEdgeRing(de, this$1._geometryFactory);
-               minEdgeRings.add(minEr);
-             }
-             de = de.getNext();
-           } while (de !== this._startDe)
-           return minEdgeRings
-         };
-         MaximalEdgeRing.prototype.setEdgeRing = function setEdgeRing (de, er) {
-           de.setEdgeRing(er);
-         };
-         MaximalEdgeRing.prototype.linkDirectedEdgesForMinimalEdgeRings = function linkDirectedEdgesForMinimalEdgeRings () {
-           var this$1 = this;
+           var matches = Object.keys(counts).sort(function (p1, p2) {
+             return counts[p2] - counts[p1];
+           }).map(function (pID) {
+             return _mainPresetIndex.item(pID);
+           });
 
-           var de = this._startDe;
-           do {
-             var node = de.getNode();
-             node.getEdges().linkMinimalDirectedEdges(this$1);
-             de = de.getNext();
-           } while (de !== this._startDe)
-         };
-         MaximalEdgeRing.prototype.getNext = function getNext (de) {
-           return de.getNext()
-         };
-         MaximalEdgeRing.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         MaximalEdgeRing.prototype.getClass = function getClass () {
-           return MaximalEdgeRing
-         };
+           if (!isForNewSelection) {
+             // A "weak" preset doesn't set any tags. (e.g. "Address")
+             var weakPreset = _activePresets.length === 1 && !_activePresets[0].isFallback() && Object.keys(_activePresets[0].addTags || {}).length === 0; // Don't replace a weak preset with a fallback preset (e.g. "Point")
 
-         return MaximalEdgeRing;
-       }(EdgeRing));
+             if (weakPreset && matches.length === 1 && matches[0].isFallback()) return;
+           }
 
-       var GraphComponent = function GraphComponent () {
-         this._label = null;
-         this._isInResult = false;
-         this._isCovered = false;
-         this._isCoveredSet = false;
-         this._isVisited = false;
-         if (arguments.length === 0) ; else if (arguments.length === 1) {
-           var label = arguments[0];
-           this._label = label;
+           entityEditor.presets(matches);
          }
-       };
-       GraphComponent.prototype.setVisited = function setVisited (isVisited) {
-         this._isVisited = isVisited;
-       };
-       GraphComponent.prototype.setInResult = function setInResult (isInResult) {
-         this._isInResult = isInResult;
-       };
-       GraphComponent.prototype.isCovered = function isCovered () {
-         return this._isCovered
-       };
-       GraphComponent.prototype.isCoveredSet = function isCoveredSet () {
-         return this._isCoveredSet
-       };
-       GraphComponent.prototype.setLabel = function setLabel (label) {
-         this._label = label;
-       };
-       GraphComponent.prototype.getLabel = function getLabel () {
-         return this._label
-       };
-       GraphComponent.prototype.setCovered = function setCovered (isCovered) {
-         this._isCovered = isCovered;
-         this._isCoveredSet = true;
-       };
-       GraphComponent.prototype.updateIM = function updateIM (im) {
-         Assert.isTrue(this._label.getGeometryCount() >= 2, 'found partial label');
-         this.computeIM(im);
-       };
-       GraphComponent.prototype.isInResult = function isInResult () {
-         return this._isInResult
-       };
-       GraphComponent.prototype.isVisited = function isVisited () {
-         return this._isVisited
-       };
-       GraphComponent.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       GraphComponent.prototype.getClass = function getClass () {
-         return GraphComponent
-       };
 
-       var Node$1 = (function (GraphComponent$$1) {
-         function Node () {
-           GraphComponent$$1.call(this);
-           this._coord = null;
-           this._edges = null;
-           var coord = arguments[0];
-           var edges = arguments[1];
-           this._coord = coord;
-           this._edges = edges;
-           this._label = new Label(0, Location.NONE);
-         }
-
-         if ( GraphComponent$$1 ) Node.__proto__ = GraphComponent$$1;
-         Node.prototype = Object.create( GraphComponent$$1 && GraphComponent$$1.prototype );
-         Node.prototype.constructor = Node;
-         Node.prototype.isIncidentEdgeInResult = function isIncidentEdgeInResult () {
-           for (var it = this.getEdges().getEdges().iterator(); it.hasNext();) {
-             var de = it.next();
-             if (de.getEdge().isInResult()) { return true }
-           }
-           return false
-         };
-         Node.prototype.isIsolated = function isIsolated () {
-           return this._label.getGeometryCount() === 1
-         };
-         Node.prototype.getCoordinate = function getCoordinate () {
-           return this._coord
-         };
-         Node.prototype.print = function print (out) {
-           out.println('node ' + this._coord + ' lbl: ' + this._label);
-         };
-         Node.prototype.computeIM = function computeIM (im) {};
-         Node.prototype.computeMergedLocation = function computeMergedLocation (label2, eltIndex) {
-           var loc = Location.NONE;
-           loc = this._label.getLocation(eltIndex);
-           if (!label2.isNull(eltIndex)) {
-             var nLoc = label2.getLocation(eltIndex);
-             if (loc !== Location.BOUNDARY) { loc = nLoc; }
-           }
-           return loc
-         };
-         Node.prototype.setLabel = function setLabel () {
-           if (arguments.length === 2) {
-             var argIndex = arguments[0];
-             var onLocation = arguments[1];
-             if (this._label === null) {
-               this._label = new Label(argIndex, onLocation);
-             } else { this._label.setLocation(argIndex, onLocation); }
-           } else { return GraphComponent$$1.prototype.setLabel.apply(this, arguments) }
-         };
-         Node.prototype.getEdges = function getEdges () {
-           return this._edges
-         };
-         Node.prototype.mergeLabel = function mergeLabel () {
-           var this$1 = this;
-
-           if (arguments[0] instanceof Node) {
-             var n = arguments[0];
-             this.mergeLabel(n._label);
-           } else if (arguments[0] instanceof Label) {
-             var label2 = arguments[0];
-             for (var i = 0; i < 2; i++) {
-               var loc = this$1.computeMergedLocation(label2, i);
-               var thisLoc = this$1._label.getLocation(i);
-               if (thisLoc === Location.NONE) { this$1._label.setLocation(i, loc); }
-             }
-           }
-         };
-         Node.prototype.add = function add (e) {
-           this._edges.insert(e);
-           e.setNode(this);
-         };
-         Node.prototype.setLabelBoundary = function setLabelBoundary (argIndex) {
-           if (this._label === null) { return null }
-           var loc = Location.NONE;
-           if (this._label !== null) { loc = this._label.getLocation(argIndex); }
-           var newLoc = null;
-           switch (loc) {
-             case Location.BOUNDARY:
-               newLoc = Location.INTERIOR;
-               break
-             case Location.INTERIOR:
-               newLoc = Location.BOUNDARY;
-               break
-             default:
-               newLoc = Location.BOUNDARY;
-               break
+         entityEditor.presets = function (val) {
+           if (!arguments.length) return _activePresets; // don't reload the same preset
+
+           if (!utilArrayIdentical(val, _activePresets)) {
+             _activePresets = val;
            }
-           this._label.setLocation(argIndex, newLoc);
-         };
-         Node.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         Node.prototype.getClass = function getClass () {
-           return Node
+
+           return entityEditor;
          };
 
-         return Node;
-       }(GraphComponent));
+         return utilRebind(entityEditor, dispatch$1, 'on');
+       }
+
+       function uiPresetList(context) {
+         var dispatch$1 = dispatch('cancel', 'choose');
 
-       var NodeMap = function NodeMap () {
-         this.nodeMap = new TreeMap();
-         this.nodeFact = null;
-         var nodeFact = arguments[0];
-         this.nodeFact = nodeFact;
-       };
-       NodeMap.prototype.find = function find (coord) {
-         return this.nodeMap.get(coord)
-       };
-       NodeMap.prototype.addNode = function addNode () {
-         if (arguments[0] instanceof Coordinate) {
-           var coord = arguments[0];
-           var node = this.nodeMap.get(coord);
-           if (node === null) {
-             node = this.nodeFact.createNode(coord);
-             this.nodeMap.put(coord, node);
-           }
-           return node
-         } else if (arguments[0] instanceof Node$1) {
-           var n = arguments[0];
-           var node$1 = this.nodeMap.get(n.getCoordinate());
-           if (node$1 === null) {
-             this.nodeMap.put(n.getCoordinate(), n);
-             return n
-           }
-           node$1.mergeLabel(n);
-           return node$1
-         }
-       };
-       NodeMap.prototype.print = function print (out) {
-         for (var it = this.iterator(); it.hasNext();) {
-           var n = it.next();
-           n.print(out);
-         }
-       };
-       NodeMap.prototype.iterator = function iterator () {
-         return this.nodeMap.values().iterator()
-       };
-       NodeMap.prototype.values = function values () {
-         return this.nodeMap.values()
-       };
-       NodeMap.prototype.getBoundaryNodes = function getBoundaryNodes (geomIndex) {
-         var bdyNodes = new ArrayList();
-         for (var i = this.iterator(); i.hasNext();) {
-           var node = i.next();
-           if (node.getLabel().getLocation(geomIndex) === Location.BOUNDARY) { bdyNodes.add(node); }
-         }
-         return bdyNodes
-       };
-       NodeMap.prototype.add = function add (e) {
-         var p = e.getCoordinate();
-         var n = this.addNode(p);
-         n.add(e);
-       };
-       NodeMap.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       NodeMap.prototype.getClass = function getClass () {
-         return NodeMap
-       };
+         var _entityIDs;
 
-       var Quadrant = function Quadrant () {};
+         var _currentPresets;
 
-       var staticAccessors$21 = { NE: { configurable: true },NW: { configurable: true },SW: { configurable: true },SE: { configurable: true } };
+         var _autofocus = false;
 
-       Quadrant.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       Quadrant.prototype.getClass = function getClass () {
-         return Quadrant
-       };
-       Quadrant.isNorthern = function isNorthern (quad) {
-         return quad === Quadrant.NE || quad === Quadrant.NW
-       };
-       Quadrant.isOpposite = function isOpposite (quad1, quad2) {
-         if (quad1 === quad2) { return false }
-         var diff = (quad1 - quad2 + 4) % 4;
-         if (diff === 2) { return true }
-         return false
-       };
-       Quadrant.commonHalfPlane = function commonHalfPlane (quad1, quad2) {
-         if (quad1 === quad2) { return quad1 }
-         var diff = (quad1 - quad2 + 4) % 4;
-         if (diff === 2) { return -1 }
-         var min = quad1 < quad2 ? quad1 : quad2;
-         var max = quad1 > quad2 ? quad1 : quad2;
-         if (min === 0 && max === 3) { return 3 }
-         return min
-       };
-       Quadrant.isInHalfPlane = function isInHalfPlane (quad, halfPlane) {
-         if (halfPlane === Quadrant.SE) {
-           return quad === Quadrant.SE || quad === Quadrant.SW
-         }
-         return quad === halfPlane || quad === halfPlane + 1
-       };
-       Quadrant.quadrant = function quadrant () {
-         if (typeof arguments[0] === 'number' && typeof arguments[1] === 'number') {
-           var dx = arguments[0];
-           var dy = arguments[1];
-           if (dx === 0.0 && dy === 0.0) { throw new IllegalArgumentException('Cannot compute the quadrant for point ( ' + dx + ', ' + dy + ' )') }
-           if (dx >= 0.0) {
-             if (dy >= 0.0) { return Quadrant.NE; } else { return Quadrant.SE }
-           } else {
-             if (dy >= 0.0) { return Quadrant.NW; } else { return Quadrant.SW }
-           }
-         } else if (arguments[0] instanceof Coordinate && arguments[1] instanceof Coordinate) {
-           var p0 = arguments[0];
-           var p1 = arguments[1];
-           if (p1.x === p0.x && p1.y === p0.y) { throw new IllegalArgumentException('Cannot compute the quadrant for two identical points ' + p0) }
-           if (p1.x >= p0.x) {
-             if (p1.y >= p0.y) { return Quadrant.NE; } else { return Quadrant.SE }
-           } else {
-             if (p1.y >= p0.y) { return Quadrant.NW; } else { return Quadrant.SW }
+         function presetList(selection) {
+           if (!_entityIDs) return;
+           var presets = _mainPresetIndex.matchAllGeometry(entityGeometries());
+           selection.html('');
+           var messagewrap = selection.append('div').attr('class', 'header fillL');
+           var message = messagewrap.append('h3').html(_t.html('inspector.choose'));
+           messagewrap.append('button').attr('class', 'preset-choose').on('click', function () {
+             dispatch$1.call('cancel', this);
+           }).call(svgIcon(_mainLocalizer.textDirection() === 'rtl' ? '#iD-icon-backward' : '#iD-icon-forward'));
+
+           function initialKeydown(d3_event) {
+             // hack to let delete shortcut work when search is autofocused
+             if (search.property('value').length === 0 && (d3_event.keyCode === utilKeybinding.keyCodes['⌫'] || d3_event.keyCode === utilKeybinding.keyCodes['⌦'])) {
+               d3_event.preventDefault();
+               d3_event.stopPropagation();
+               operationDelete(context, _entityIDs)(); // hack to let undo work when search is autofocused
+             } else if (search.property('value').length === 0 && (d3_event.ctrlKey || d3_event.metaKey) && d3_event.keyCode === utilKeybinding.keyCodes.z) {
+               d3_event.preventDefault();
+               d3_event.stopPropagation();
+               context.undo();
+             } else if (!d3_event.ctrlKey && !d3_event.metaKey) {
+               // don't check for delete/undo hack on future keydown events
+               select(this).on('keydown', keydown);
+               keydown.call(this, d3_event);
+             }
            }
-         }
-       };
-       staticAccessors$21.NE.get = function () { return 0 };
-       staticAccessors$21.NW.get = function () { return 1 };
-       staticAccessors$21.SW.get = function () { return 2 };
-       staticAccessors$21.SE.get = function () { return 3 };
-
-       Object.defineProperties( Quadrant, staticAccessors$21 );
-
-       var EdgeEnd = function EdgeEnd () {
-         this._edge = null;
-         this._label = null;
-         this._node = null;
-         this._p0 = null;
-         this._p1 = null;
-         this._dx = null;
-         this._dy = null;
-         this._quadrant = null;
-         if (arguments.length === 1) {
-           var edge = arguments[0];
-           this._edge = edge;
-         } else if (arguments.length === 3) {
-           var edge$1 = arguments[0];
-           var p0 = arguments[1];
-           var p1 = arguments[2];
-           var label = null;
-           this._edge = edge$1;
-           this.init(p0, p1);
-           this._label = label;
-         } else if (arguments.length === 4) {
-           var edge$2 = arguments[0];
-           var p0$1 = arguments[1];
-           var p1$1 = arguments[2];
-           var label$1 = arguments[3];
-           this._edge = edge$2;
-           this.init(p0$1, p1$1);
-           this._label = label$1;
-         }
-       };
-       EdgeEnd.prototype.compareDirection = function compareDirection (e) {
-         if (this._dx === e._dx && this._dy === e._dy) { return 0 }
-         if (this._quadrant > e._quadrant) { return 1 }
-         if (this._quadrant < e._quadrant) { return -1 }
-         return CGAlgorithms.computeOrientation(e._p0, e._p1, this._p1)
-       };
-       EdgeEnd.prototype.getDy = function getDy () {
-         return this._dy
-       };
-       EdgeEnd.prototype.getCoordinate = function getCoordinate () {
-         return this._p0
-       };
-       EdgeEnd.prototype.setNode = function setNode (node) {
-         this._node = node;
-       };
-       EdgeEnd.prototype.print = function print (out) {
-         var angle = Math.atan2(this._dy, this._dx);
-         var className = this.getClass().getName();
-         var lastDotPos = className.lastIndexOf('.');
-         var name = className.substring(lastDotPos + 1);
-         out.print('  ' + name + ': ' + this._p0 + ' - ' + this._p1 + ' ' + this._quadrant + ':' + angle + '   ' + this._label);
-       };
-       EdgeEnd.prototype.compareTo = function compareTo (obj) {
-         var e = obj;
-         return this.compareDirection(e)
-       };
-       EdgeEnd.prototype.getDirectedCoordinate = function getDirectedCoordinate () {
-         return this._p1
-       };
-       EdgeEnd.prototype.getDx = function getDx () {
-         return this._dx
-       };
-       EdgeEnd.prototype.getLabel = function getLabel () {
-         return this._label
-       };
-       EdgeEnd.prototype.getEdge = function getEdge () {
-         return this._edge
-       };
-       EdgeEnd.prototype.getQuadrant = function getQuadrant () {
-         return this._quadrant
-       };
-       EdgeEnd.prototype.getNode = function getNode () {
-         return this._node
-       };
-       EdgeEnd.prototype.toString = function toString () {
-         var angle = Math.atan2(this._dy, this._dx);
-         var className = this.getClass().getName();
-         var lastDotPos = className.lastIndexOf('.');
-         var name = className.substring(lastDotPos + 1);
-         return '  ' + name + ': ' + this._p0 + ' - ' + this._p1 + ' ' + this._quadrant + ':' + angle + '   ' + this._label
-       };
-       EdgeEnd.prototype.computeLabel = function computeLabel (boundaryNodeRule) {};
-       EdgeEnd.prototype.init = function init (p0, p1) {
-         this._p0 = p0;
-         this._p1 = p1;
-         this._dx = p1.x - p0.x;
-         this._dy = p1.y - p0.y;
-         this._quadrant = Quadrant.quadrant(this._dx, this._dy);
-         Assert.isTrue(!(this._dx === 0 && this._dy === 0), 'EdgeEnd with identical endpoints found');
-       };
-       EdgeEnd.prototype.interfaces_ = function interfaces_ () {
-         return [Comparable]
-       };
-       EdgeEnd.prototype.getClass = function getClass () {
-         return EdgeEnd
-       };
 
-       var DirectedEdge = (function (EdgeEnd$$1) {
-         function DirectedEdge () {
-           var edge = arguments[0];
-           var isForward = arguments[1];
-           EdgeEnd$$1.call(this, edge);
-           this._isForward = null;
-           this._isInResult = false;
-           this._isVisited = false;
-           this._sym = null;
-           this._next = null;
-           this._nextMin = null;
-           this._edgeRing = null;
-           this._minEdgeRing = null;
-           this._depth = [0, -999, -999];
-           this._isForward = isForward;
-           if (isForward) {
-             this.init(edge.getCoordinate(0), edge.getCoordinate(1));
-           } else {
-             var n = edge.getNumPoints() - 1;
-             this.init(edge.getCoordinate(n), edge.getCoordinate(n - 1));
+           function keydown(d3_event) {
+             // down arrow
+             if (d3_event.keyCode === utilKeybinding.keyCodes['↓'] && // if insertion point is at the end of the string
+             search.node().selectionStart === search.property('value').length) {
+               d3_event.preventDefault();
+               d3_event.stopPropagation(); // move focus to the first item in the preset list
+
+               var buttons = list.selectAll('.preset-list-button');
+               if (!buttons.empty()) buttons.nodes()[0].focus();
+             }
            }
-           this.computeDirectedLabel();
-         }
 
-         if ( EdgeEnd$$1 ) DirectedEdge.__proto__ = EdgeEnd$$1;
-         DirectedEdge.prototype = Object.create( EdgeEnd$$1 && EdgeEnd$$1.prototype );
-         DirectedEdge.prototype.constructor = DirectedEdge;
-         DirectedEdge.prototype.getNextMin = function getNextMin () {
-           return this._nextMin
-         };
-         DirectedEdge.prototype.getDepth = function getDepth (position) {
-           return this._depth[position]
-         };
-         DirectedEdge.prototype.setVisited = function setVisited (isVisited) {
-           this._isVisited = isVisited;
-         };
-         DirectedEdge.prototype.computeDirectedLabel = function computeDirectedLabel () {
-           this._label = new Label(this._edge.getLabel());
-           if (!this._isForward) { this._label.flip(); }
-         };
-         DirectedEdge.prototype.getNext = function getNext () {
-           return this._next
-         };
-         DirectedEdge.prototype.setDepth = function setDepth (position, depthVal) {
-           if (this._depth[position] !== -999) {
-             if (this._depth[position] !== depthVal) { throw new TopologyException('assigned depths do not match', this.getCoordinate()) }
+           function keypress(d3_event) {
+             // enter
+             var value = search.property('value');
+
+             if (d3_event.keyCode === 13 && // ↩ Return
+             value.length) {
+               list.selectAll('.preset-list-item:first-child').each(function (d) {
+                 d.choose.call(this);
+               });
+             }
            }
-           this._depth[position] = depthVal;
-         };
-         DirectedEdge.prototype.isInteriorAreaEdge = function isInteriorAreaEdge () {
-           var this$1 = this;
 
-           var isInteriorAreaEdge = true;
-           for (var i = 0; i < 2; i++) {
-             if (!(this$1._label.isArea(i) && this$1._label.getLocation(i, Position.LEFT) === Location.INTERIOR && this$1._label.getLocation(i, Position.RIGHT) === Location.INTERIOR)) {
-               isInteriorAreaEdge = false;
+           function inputevent() {
+             var value = search.property('value');
+             list.classed('filtered', value.length);
+             var extent = combinedEntityExtent();
+             var results, messageText;
+
+             if (value.length && extent) {
+               var center = extent.center();
+               var countryCode = iso1A2Code(center);
+               results = presets.search(value, entityGeometries()[0], countryCode && countryCode.toLowerCase());
+               messageText = _t('inspector.results', {
+                 n: results.collection.length,
+                 search: value
+               });
+             } else {
+               results = _mainPresetIndex.defaults(entityGeometries()[0], 36, !context.inIntro());
+               messageText = _t('inspector.choose');
              }
+
+             list.call(drawList, results);
+             message.html(messageText);
            }
-           return isInteriorAreaEdge
-         };
-         DirectedEdge.prototype.setNextMin = function setNextMin (nextMin) {
-           this._nextMin = nextMin;
-         };
-         DirectedEdge.prototype.print = function print (out) {
-           EdgeEnd$$1.prototype.print.call(this, out);
-           out.print(' ' + this._depth[Position.LEFT] + '/' + this._depth[Position.RIGHT]);
-           out.print(' (' + this.getDepthDelta() + ')');
-           if (this._isInResult) { out.print(' inResult'); }
-         };
-         DirectedEdge.prototype.setMinEdgeRing = function setMinEdgeRing (minEdgeRing) {
-           this._minEdgeRing = minEdgeRing;
-         };
-         DirectedEdge.prototype.isLineEdge = function isLineEdge () {
-           var isLine = this._label.isLine(0) || this._label.isLine(1);
-           var isExteriorIfArea0 = !this._label.isArea(0) || this._label.allPositionsEqual(0, Location.EXTERIOR);
-           var isExteriorIfArea1 = !this._label.isArea(1) || this._label.allPositionsEqual(1, Location.EXTERIOR);
-           return isLine && isExteriorIfArea0 && isExteriorIfArea1
-         };
-         DirectedEdge.prototype.setEdgeRing = function setEdgeRing (edgeRing) {
-           this._edgeRing = edgeRing;
-         };
-         DirectedEdge.prototype.getMinEdgeRing = function getMinEdgeRing () {
-           return this._minEdgeRing
-         };
-         DirectedEdge.prototype.getDepthDelta = function getDepthDelta () {
-           var depthDelta = this._edge.getDepthDelta();
-           if (!this._isForward) { depthDelta = -depthDelta; }
-           return depthDelta
-         };
-         DirectedEdge.prototype.setInResult = function setInResult (isInResult) {
-           this._isInResult = isInResult;
-         };
-         DirectedEdge.prototype.getSym = function getSym () {
-           return this._sym
-         };
-         DirectedEdge.prototype.isForward = function isForward () {
-           return this._isForward
-         };
-         DirectedEdge.prototype.getEdge = function getEdge () {
-           return this._edge
-         };
-         DirectedEdge.prototype.printEdge = function printEdge (out) {
-           this.print(out);
-           out.print(' ');
-           if (this._isForward) { this._edge.print(out); } else { this._edge.printReverse(out); }
-         };
-         DirectedEdge.prototype.setSym = function setSym (de) {
-           this._sym = de;
-         };
-         DirectedEdge.prototype.setVisitedEdge = function setVisitedEdge (isVisited) {
-           this.setVisited(isVisited);
-           this._sym.setVisited(isVisited);
-         };
-         DirectedEdge.prototype.setEdgeDepths = function setEdgeDepths (position, depth) {
-           var depthDelta = this.getEdge().getDepthDelta();
-           if (!this._isForward) { depthDelta = -depthDelta; }
-           var directionFactor = 1;
-           if (position === Position.LEFT) { directionFactor = -1; }
-           var oppositePos = Position.opposite(position);
-           var delta = depthDelta * directionFactor;
-           var oppositeDepth = depth + delta;
-           this.setDepth(position, depth);
-           this.setDepth(oppositePos, oppositeDepth);
-         };
-         DirectedEdge.prototype.getEdgeRing = function getEdgeRing () {
-           return this._edgeRing
-         };
-         DirectedEdge.prototype.isInResult = function isInResult () {
-           return this._isInResult
-         };
-         DirectedEdge.prototype.setNext = function setNext (next) {
-           this._next = next;
-         };
-         DirectedEdge.prototype.isVisited = function isVisited () {
-           return this._isVisited
-         };
-         DirectedEdge.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         DirectedEdge.prototype.getClass = function getClass () {
-           return DirectedEdge
-         };
-         DirectedEdge.depthFactor = function depthFactor (currLocation, nextLocation) {
-           if (currLocation === Location.EXTERIOR && nextLocation === Location.INTERIOR) { return 1; } else if (currLocation === Location.INTERIOR && nextLocation === Location.EXTERIOR) { return -1 }
-           return 0
-         };
 
-         return DirectedEdge;
-       }(EdgeEnd));
+           var searchWrap = selection.append('div').attr('class', 'search-header');
+           searchWrap.call(svgIcon('#iD-icon-search', 'pre-text'));
+           var search = searchWrap.append('input').attr('class', 'preset-search-input').attr('placeholder', _t('inspector.search')).attr('type', 'search').call(utilNoAuto).on('keydown', initialKeydown).on('keypress', keypress).on('input', inputevent);
 
-       var NodeFactory = function NodeFactory () {};
+           if (_autofocus) {
+             search.node().focus(); // Safari 14 doesn't always like to focus immediately,
+             // so try again on the next pass
 
-       NodeFactory.prototype.createNode = function createNode (coord) {
-         return new Node$1(coord, null)
-       };
-       NodeFactory.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       NodeFactory.prototype.getClass = function getClass () {
-         return NodeFactory
-       };
+             setTimeout(function () {
+               search.node().focus();
+             }, 0);
+           }
 
-       var PlanarGraph = function PlanarGraph () {
-         this._edges = new ArrayList();
-         this._nodes = null;
-         this._edgeEndList = new ArrayList();
-         if (arguments.length === 0) {
-           this._nodes = new NodeMap(new NodeFactory());
-         } else if (arguments.length === 1) {
-           var nodeFact = arguments[0];
-           this._nodes = new NodeMap(nodeFact);
+           var listWrap = selection.append('div').attr('class', 'inspector-body');
+           var list = listWrap.append('div').attr('class', 'preset-list').call(drawList, _mainPresetIndex.defaults(entityGeometries()[0], 36, !context.inIntro()));
+           context.features().on('change.preset-list', updateForFeatureHiddenState);
          }
-       };
-       PlanarGraph.prototype.printEdges = function printEdges (out) {
-           var this$1 = this;
 
-         out.println('Edges:');
-         for (var i = 0; i < this._edges.size(); i++) {
-           out.println('edge ' + i + ':');
-           var e = this$1._edges.get(i);
-           e.print(out);
-           e.eiList.print(out);
-         }
-       };
-       PlanarGraph.prototype.find = function find (coord) {
-         return this._nodes.find(coord)
-       };
-       PlanarGraph.prototype.addNode = function addNode () {
-         if (arguments[0] instanceof Node$1) {
-           var node = arguments[0];
-           return this._nodes.addNode(node)
-         } else if (arguments[0] instanceof Coordinate) {
-           var coord = arguments[0];
-           return this._nodes.addNode(coord)
-         }
-       };
-       PlanarGraph.prototype.getNodeIterator = function getNodeIterator () {
-         return this._nodes.iterator()
-       };
-       PlanarGraph.prototype.linkResultDirectedEdges = function linkResultDirectedEdges () {
-         for (var nodeit = this._nodes.iterator(); nodeit.hasNext();) {
-           var node = nodeit.next();
-           node.getEdges().linkResultDirectedEdges();
-         }
-       };
-       PlanarGraph.prototype.debugPrintln = function debugPrintln (o) {
-         System.out.println(o);
-       };
-       PlanarGraph.prototype.isBoundaryNode = function isBoundaryNode (geomIndex, coord) {
-         var node = this._nodes.find(coord);
-         if (node === null) { return false }
-         var label = node.getLabel();
-         if (label !== null && label.getLocation(geomIndex) === Location.BOUNDARY) { return true }
-         return false
-       };
-       PlanarGraph.prototype.linkAllDirectedEdges = function linkAllDirectedEdges () {
-         for (var nodeit = this._nodes.iterator(); nodeit.hasNext();) {
-           var node = nodeit.next();
-           node.getEdges().linkAllDirectedEdges();
-         }
-       };
-       PlanarGraph.prototype.matchInSameDirection = function matchInSameDirection (p0, p1, ep0, ep1) {
-         if (!p0.equals(ep0)) { return false }
-         if (CGAlgorithms.computeOrientation(p0, p1, ep1) === CGAlgorithms.COLLINEAR && Quadrant.quadrant(p0, p1) === Quadrant.quadrant(ep0, ep1)) { return true }
-         return false
-       };
-       PlanarGraph.prototype.getEdgeEnds = function getEdgeEnds () {
-         return this._edgeEndList
-       };
-       PlanarGraph.prototype.debugPrint = function debugPrint (o) {
-         System.out.print(o);
-       };
-       PlanarGraph.prototype.getEdgeIterator = function getEdgeIterator () {
-         return this._edges.iterator()
-       };
-       PlanarGraph.prototype.findEdgeInSameDirection = function findEdgeInSameDirection (p0, p1) {
-           var this$1 = this;
+         function drawList(list, presets) {
+           presets = presets.matchAllGeometry(entityGeometries());
+           var collection = presets.collection.reduce(function (collection, preset) {
+             if (!preset) return collection;
 
-         for (var i = 0; i < this._edges.size(); i++) {
-           var e = this$1._edges.get(i);
-           var eCoord = e.getCoordinates();
-           if (this$1.matchInSameDirection(p0, p1, eCoord[0], eCoord[1])) { return e }
-           if (this$1.matchInSameDirection(p0, p1, eCoord[eCoord.length - 1], eCoord[eCoord.length - 2])) { return e }
-         }
-         return null
-       };
-       PlanarGraph.prototype.insertEdge = function insertEdge (e) {
-         this._edges.add(e);
-       };
-       PlanarGraph.prototype.findEdgeEnd = function findEdgeEnd (e) {
-         for (var i = this.getEdgeEnds().iterator(); i.hasNext();) {
-           var ee = i.next();
-           if (ee.getEdge() === e) { return ee }
-         }
-         return null
-       };
-       PlanarGraph.prototype.addEdges = function addEdges (edgesToAdd) {
-           var this$1 = this;
-
-         for (var it = edgesToAdd.iterator(); it.hasNext();) {
-           var e = it.next();
-           this$1._edges.add(e);
-           var de1 = new DirectedEdge(e, true);
-           var de2 = new DirectedEdge(e, false);
-           de1.setSym(de2);
-           de2.setSym(de1);
-           this$1.add(de1);
-           this$1.add(de2);
-         }
-       };
-       PlanarGraph.prototype.add = function add (e) {
-         this._nodes.add(e);
-         this._edgeEndList.add(e);
-       };
-       PlanarGraph.prototype.getNodes = function getNodes () {
-         return this._nodes.values()
-       };
-       PlanarGraph.prototype.findEdge = function findEdge (p0, p1) {
-           var this$1 = this;
+             if (preset.members) {
+               if (preset.members.collection.filter(function (preset) {
+                 return preset.addable();
+               }).length > 1) {
+                 collection.push(CategoryItem(preset));
+               }
+             } else if (preset.addable()) {
+               collection.push(PresetItem(preset));
+             }
 
-         for (var i = 0; i < this._edges.size(); i++) {
-           var e = this$1._edges.get(i);
-           var eCoord = e.getCoordinates();
-           if (p0.equals(eCoord[0]) && p1.equals(eCoord[1])) { return e }
-         }
-         return null
-       };
-       PlanarGraph.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       PlanarGraph.prototype.getClass = function getClass () {
-         return PlanarGraph
-       };
-       PlanarGraph.linkResultDirectedEdges = function linkResultDirectedEdges (nodes) {
-         for (var nodeit = nodes.iterator(); nodeit.hasNext();) {
-           var node = nodeit.next();
-           node.getEdges().linkResultDirectedEdges();
-         }
-       };
+             return collection;
+           }, []);
+           var items = list.selectAll('.preset-list-item').data(collection, function (d) {
+             return d.preset.id;
+           });
+           items.order();
+           items.exit().remove();
+           items.enter().append('div').attr('class', function (item) {
+             return 'preset-list-item preset-' + item.preset.id.replace('/', '-');
+           }).classed('current', function (item) {
+             return _currentPresets.indexOf(item.preset) !== -1;
+           }).each(function (item) {
+             select(this).call(item);
+           }).style('opacity', 0).transition().style('opacity', 1);
+           updateForFeatureHiddenState();
+         }
+
+         function itemKeydown(d3_event) {
+           // the actively focused item
+           var item = select(this.closest('.preset-list-item'));
+           var parentItem = select(item.node().parentNode.closest('.preset-list-item')); // arrow down, move focus to the next, lower item
+
+           if (d3_event.keyCode === utilKeybinding.keyCodes['↓']) {
+             d3_event.preventDefault();
+             d3_event.stopPropagation(); // the next item in the list at the same level
+
+             var nextItem = select(item.node().nextElementSibling); // if there is no next item in this list
+
+             if (nextItem.empty()) {
+               // if there is a parent item
+               if (!parentItem.empty()) {
+                 // the item is the last item of a sublist,
+                 // select the next item at the parent level
+                 nextItem = select(parentItem.node().nextElementSibling);
+               } // if the focused item is expanded
+
+             } else if (select(this).classed('expanded')) {
+               // select the first subitem instead
+               nextItem = item.select('.subgrid .preset-list-item:first-child');
+             }
+
+             if (!nextItem.empty()) {
+               // focus on the next item
+               nextItem.select('.preset-list-button').node().focus();
+             } // arrow up, move focus to the previous, higher item
+
+           } else if (d3_event.keyCode === utilKeybinding.keyCodes['↑']) {
+             d3_event.preventDefault();
+             d3_event.stopPropagation(); // the previous item in the list at the same level
+
+             var previousItem = select(item.node().previousElementSibling); // if there is no previous item in this list
+
+             if (previousItem.empty()) {
+               // if there is a parent item
+               if (!parentItem.empty()) {
+                 // the item is the first subitem of a sublist select the parent item
+                 previousItem = parentItem;
+               } // if the previous item is expanded
+
+             } else if (previousItem.select('.preset-list-button').classed('expanded')) {
+               // select the last subitem of the sublist of the previous item
+               previousItem = previousItem.select('.subgrid .preset-list-item:last-child');
+             }
+
+             if (!previousItem.empty()) {
+               // focus on the previous item
+               previousItem.select('.preset-list-button').node().focus();
+             } else {
+               // the focus is at the top of the list, move focus back to the search field
+               var search = select(this.closest('.preset-list-pane')).select('.preset-search-input');
+               search.node().focus();
+             } // arrow left, move focus to the parent item if there is one
 
-       var PolygonBuilder = function PolygonBuilder () {
-         this._geometryFactory = null;
-         this._shellList = new ArrayList();
-         var geometryFactory = arguments[0];
-         this._geometryFactory = geometryFactory;
-       };
-       PolygonBuilder.prototype.sortShellsAndHoles = function sortShellsAndHoles (edgeRings, shellList, freeHoleList) {
-         for (var it = edgeRings.iterator(); it.hasNext();) {
-           var er = it.next();
-           if (er.isHole()) {
-             freeHoleList.add(er);
-           } else {
-             shellList.add(er);
-           }
-         }
-       };
-       PolygonBuilder.prototype.computePolygons = function computePolygons (shellList) {
-           var this$1 = this;
+           } else if (d3_event.keyCode === utilKeybinding.keyCodes[_mainLocalizer.textDirection() === 'rtl' ? '→' : '←']) {
+             d3_event.preventDefault();
+             d3_event.stopPropagation(); // if there is a parent item, focus on the parent item
 
-         var resultPolyList = new ArrayList();
-         for (var it = shellList.iterator(); it.hasNext();) {
-           var er = it.next();
-           var poly = er.toPolygon(this$1._geometryFactory);
-           resultPolyList.add(poly);
-         }
-         return resultPolyList
-       };
-       PolygonBuilder.prototype.placeFreeHoles = function placeFreeHoles (shellList, freeHoleList) {
-           var this$1 = this;
+             if (!parentItem.empty()) {
+               parentItem.select('.preset-list-button').node().focus();
+             } // arrow right, choose this item
 
-         for (var it = freeHoleList.iterator(); it.hasNext();) {
-           var hole = it.next();
-           if (hole.getShell() === null) {
-             var shell = this$1.findEdgeRingContaining(hole, shellList);
-             if (shell === null) { throw new TopologyException('unable to assign hole to a shell', hole.getCoordinate(0)) }
-             hole.setShell(shell);
+           } else if (d3_event.keyCode === utilKeybinding.keyCodes[_mainLocalizer.textDirection() === 'rtl' ? '←' : '→']) {
+             d3_event.preventDefault();
+             d3_event.stopPropagation();
+             item.datum().choose.call(select(this).node());
            }
          }
-       };
-       PolygonBuilder.prototype.buildMinimalEdgeRings = function buildMinimalEdgeRings (maxEdgeRings, shellList, freeHoleList) {
-           var this$1 = this;
-
-         var edgeRings = new ArrayList();
-         for (var it = maxEdgeRings.iterator(); it.hasNext();) {
-           var er = it.next();
-           if (er.getMaxNodeDegree() > 2) {
-             er.linkDirectedEdgesForMinimalEdgeRings();
-             var minEdgeRings = er.buildMinimalRings();
-             var shell = this$1.findShell(minEdgeRings);
-             if (shell !== null) {
-               this$1.placePolygonHoles(shell, minEdgeRings);
-               shellList.add(shell);
-             } else {
-               freeHoleList.addAll(minEdgeRings);
+
+         function CategoryItem(preset) {
+           var box,
+               sublist,
+               shown = false;
+
+           function item(selection) {
+             var wrap = selection.append('div').attr('class', 'preset-list-button-wrap category');
+
+             function click() {
+               var isExpanded = select(this).classed('expanded');
+               var iconName = isExpanded ? _mainLocalizer.textDirection() === 'rtl' ? '#iD-icon-backward' : '#iD-icon-forward' : '#iD-icon-down';
+               select(this).classed('expanded', !isExpanded);
+               select(this).selectAll('div.label-inner svg.icon use').attr('href', iconName);
+               item.choose();
              }
-           } else {
-             edgeRings.add(er);
+
+             var geometries = entityGeometries();
+             var button = wrap.append('button').attr('class', 'preset-list-button').classed('expanded', false).call(uiPresetIcon().geometry(geometries.length === 1 && geometries[0]).preset(preset)).on('click', click).on('keydown', function (d3_event) {
+               // right arrow, expand the focused item
+               if (d3_event.keyCode === utilKeybinding.keyCodes[_mainLocalizer.textDirection() === 'rtl' ? '←' : '→']) {
+                 d3_event.preventDefault();
+                 d3_event.stopPropagation(); // if the item isn't expanded
+
+                 if (!select(this).classed('expanded')) {
+                   // toggle expansion (expand the item)
+                   click.call(this, d3_event);
+                 } // left arrow, collapse the focused item
+
+               } else if (d3_event.keyCode === utilKeybinding.keyCodes[_mainLocalizer.textDirection() === 'rtl' ? '→' : '←']) {
+                 d3_event.preventDefault();
+                 d3_event.stopPropagation(); // if the item is expanded
+
+                 if (select(this).classed('expanded')) {
+                   // toggle expansion (collapse the item)
+                   click.call(this, d3_event);
+                 }
+               } else {
+                 itemKeydown.call(this, d3_event);
+               }
+             });
+             var label = button.append('div').attr('class', 'label').append('div').attr('class', 'label-inner');
+             label.append('div').attr('class', 'namepart').call(svgIcon(_mainLocalizer.textDirection() === 'rtl' ? '#iD-icon-backward' : '#iD-icon-forward', 'inline')).append('span').html(function () {
+               return preset.nameLabel() + '&hellip;';
+             });
+             box = selection.append('div').attr('class', 'subgrid').style('max-height', '0px').style('opacity', 0);
+             box.append('div').attr('class', 'arrow');
+             sublist = box.append('div').attr('class', 'preset-list fillL3');
            }
-         }
-         return edgeRings
-       };
-       PolygonBuilder.prototype.containsPoint = function containsPoint (p) {
-         for (var it = this._shellList.iterator(); it.hasNext();) {
-           var er = it.next();
-           if (er.containsPoint(p)) { return true }
-         }
-         return false
-       };
-       PolygonBuilder.prototype.buildMaximalEdgeRings = function buildMaximalEdgeRings (dirEdges) {
-           var this$1 = this;
 
-         var maxEdgeRings = new ArrayList();
-         for (var it = dirEdges.iterator(); it.hasNext();) {
-           var de = it.next();
-           if (de.isInResult() && de.getLabel().isArea()) {
-             if (de.getEdgeRing() === null) {
-               var er = new MaximalEdgeRing(de, this$1._geometryFactory);
-               maxEdgeRings.add(er);
-               er.setInResult();
+           item.choose = function () {
+             if (!box || !sublist) return;
+
+             if (shown) {
+               shown = false;
+               box.transition().duration(200).style('opacity', '0').style('max-height', '0px').style('padding-bottom', '0px');
+             } else {
+               shown = true;
+               var members = preset.members.matchAllGeometry(entityGeometries());
+               sublist.call(drawList, members);
+               box.transition().duration(200).style('opacity', '1').style('max-height', 200 + members.collection.length * 190 + 'px').style('padding-bottom', '10px');
              }
-           }
+           };
+
+           item.preset = preset;
+           return item;
          }
-         return maxEdgeRings
-       };
-       PolygonBuilder.prototype.placePolygonHoles = function placePolygonHoles (shell, minEdgeRings) {
-         for (var it = minEdgeRings.iterator(); it.hasNext();) {
-           var er = it.next();
-           if (er.isHole()) {
-             er.setShell(shell);
+
+         function PresetItem(preset) {
+           function item(selection) {
+             var wrap = selection.append('div').attr('class', 'preset-list-button-wrap');
+             var geometries = entityGeometries();
+             var button = wrap.append('button').attr('class', 'preset-list-button').call(uiPresetIcon().geometry(geometries.length === 1 && geometries[0]).preset(preset)).on('click', item.choose).on('keydown', itemKeydown);
+             var label = button.append('div').attr('class', 'label').append('div').attr('class', 'label-inner');
+             var nameparts = [preset.nameLabel(), preset.subtitleLabel()].filter(Boolean);
+             label.selectAll('.namepart').data(nameparts).enter().append('div').attr('class', 'namepart').html(function (d) {
+               return d;
+             });
+             wrap.call(item.reference.button);
+             selection.call(item.reference.body);
            }
-         }
-       };
-       PolygonBuilder.prototype.getPolygons = function getPolygons () {
-         var resultPolyList = this.computePolygons(this._shellList);
-         return resultPolyList
-       };
-       PolygonBuilder.prototype.findEdgeRingContaining = function findEdgeRingContaining (testEr, shellList) {
-         var testRing = testEr.getLinearRing();
-         var testEnv = testRing.getEnvelopeInternal();
-         var testPt = testRing.getCoordinateN(0);
-         var minShell = null;
-         var minEnv = null;
-         for (var it = shellList.iterator(); it.hasNext();) {
-           var tryShell = it.next();
-           var tryRing = tryShell.getLinearRing();
-           var tryEnv = tryRing.getEnvelopeInternal();
-           if (minShell !== null) { minEnv = minShell.getLinearRing().getEnvelopeInternal(); }
-           var isContained = false;
-           if (tryEnv.contains(testEnv) && CGAlgorithms.isPointInRing(testPt, tryRing.getCoordinates())) { isContained = true; }
-           if (isContained) {
-             if (minShell === null || minEnv.contains(tryEnv)) {
-               minShell = tryShell;
-             }
-           }
-         }
-         return minShell
-       };
-       PolygonBuilder.prototype.findShell = function findShell (minEdgeRings) {
-         var shellCount = 0;
-         var shell = null;
-         for (var it = minEdgeRings.iterator(); it.hasNext();) {
-           var er = it.next();
-           if (!er.isHole()) {
-             shell = er;
-             shellCount++;
-           }
-         }
-         Assert.isTrue(shellCount <= 1, 'found two shells in MinimalEdgeRing list');
-         return shell
-       };
-       PolygonBuilder.prototype.add = function add () {
-         if (arguments.length === 1) {
-           var graph = arguments[0];
-           this.add(graph.getEdgeEnds(), graph.getNodes());
-         } else if (arguments.length === 2) {
-           var dirEdges = arguments[0];
-           var nodes = arguments[1];
-           PlanarGraph.linkResultDirectedEdges(nodes);
-           var maxEdgeRings = this.buildMaximalEdgeRings(dirEdges);
-           var freeHoleList = new ArrayList();
-           var edgeRings = this.buildMinimalEdgeRings(maxEdgeRings, this._shellList, freeHoleList);
-           this.sortShellsAndHoles(edgeRings, this._shellList, freeHoleList);
-           this.placeFreeHoles(this._shellList, freeHoleList);
-         }
-       };
-       PolygonBuilder.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       PolygonBuilder.prototype.getClass = function getClass () {
-         return PolygonBuilder
-       };
 
-       var Boundable = function Boundable () {};
+           item.choose = function () {
+             if (select(this).classed('disabled')) return;
 
-       Boundable.prototype.getBounds = function getBounds () {};
-       Boundable.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       Boundable.prototype.getClass = function getClass () {
-         return Boundable
-       };
+             if (!context.inIntro()) {
+               _mainPresetIndex.setMostRecent(preset, entityGeometries()[0]);
+             }
 
-       var ItemBoundable = function ItemBoundable () {
-         this._bounds = null;
-         this._item = null;
-         var bounds = arguments[0];
-         var item = arguments[1];
-         this._bounds = bounds;
-         this._item = item;
-       };
-       ItemBoundable.prototype.getItem = function getItem () {
-         return this._item
-       };
-       ItemBoundable.prototype.getBounds = function getBounds () {
-         return this._bounds
-       };
-       ItemBoundable.prototype.interfaces_ = function interfaces_ () {
-         return [Boundable, Serializable]
-       };
-       ItemBoundable.prototype.getClass = function getClass () {
-         return ItemBoundable
-       };
+             context.perform(function (graph) {
+               for (var i in _entityIDs) {
+                 var entityID = _entityIDs[i];
+                 var oldPreset = _mainPresetIndex.match(graph.entity(entityID), graph);
+                 graph = actionChangePreset(entityID, oldPreset, preset)(graph);
+               }
 
-       var PriorityQueue = function PriorityQueue () {
-         this._size = null;
-         this._items = null;
-         this._size = 0;
-         this._items = new ArrayList();
-         this._items.add(null);
-       };
-       PriorityQueue.prototype.poll = function poll () {
-         if (this.isEmpty()) { return null }
-         var minItem = this._items.get(1);
-         this._items.set(1, this._items.get(this._size));
-         this._size -= 1;
-         this.reorder(1);
-         return minItem
-       };
-       PriorityQueue.prototype.size = function size () {
-         return this._size
-       };
-       PriorityQueue.prototype.reorder = function reorder (hole) {
-           var this$1 = this;
+               return graph;
+             }, _t('operations.change_tags.annotation'));
+             context.validator().validate(); // rerun validation
 
-         var child = null;
-         var tmp = this._items.get(hole);
-         for (; hole * 2 <= this._size; hole = child) {
-           child = hole * 2;
-           if (child !== this$1._size && this$1._items.get(child + 1).compareTo(this$1._items.get(child)) < 0) { child++; }
-           if (this$1._items.get(child).compareTo(tmp) < 0) { this$1._items.set(hole, this$1._items.get(child)); } else { break }
-         }
-         this._items.set(hole, tmp);
-       };
-       PriorityQueue.prototype.clear = function clear () {
-         this._size = 0;
-         this._items.clear();
-       };
-       PriorityQueue.prototype.isEmpty = function isEmpty () {
-         return this._size === 0
-       };
-       PriorityQueue.prototype.add = function add (x) {
-           var this$1 = this;
+             dispatch$1.call('choose', this, preset);
+           };
+
+           item.help = function (d3_event) {
+             d3_event.stopPropagation();
+             item.reference.toggle();
+           };
 
-         this._items.add(null);
-         this._size += 1;
-         var hole = this._size;
-         this._items.set(0, x);
-         for (; x.compareTo(this._items.get(Math.trunc(hole / 2))) < 0; hole /= 2) {
-           this$1._items.set(hole, this$1._items.get(Math.trunc(hole / 2)));
+           item.preset = preset;
+           item.reference = uiTagReference(preset.reference());
+           return item;
          }
-         this._items.set(hole, x);
-       };
-       PriorityQueue.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       PriorityQueue.prototype.getClass = function getClass () {
-         return PriorityQueue
-       };
 
-       var ItemVisitor = function ItemVisitor () {};
+         function updateForFeatureHiddenState() {
+           if (!_entityIDs.every(context.hasEntity)) return;
+           var geometries = entityGeometries();
+           var button = context.container().selectAll('.preset-list .preset-list-button'); // remove existing tooltips
 
-       ItemVisitor.prototype.visitItem = function visitItem (item) {};
-       ItemVisitor.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       ItemVisitor.prototype.getClass = function getClass () {
-         return ItemVisitor
-       };
+           button.call(uiTooltip().destroyAny);
+           button.each(function (item, index) {
+             var hiddenPresetFeaturesId;
 
-       var SpatialIndex = function SpatialIndex () {};
+             for (var i in geometries) {
+               hiddenPresetFeaturesId = context.features().isHiddenPreset(item.preset, geometries[i]);
+               if (hiddenPresetFeaturesId) break;
+             }
 
-       SpatialIndex.prototype.insert = function insert (itemEnv, item) {};
-       SpatialIndex.prototype.remove = function remove (itemEnv, item) {};
-       SpatialIndex.prototype.query = function query () {
-         // if (arguments.length === 1) {
-         // const searchEnv = arguments[0]
-         // } else if (arguments.length === 2) {
-         // const searchEnv = arguments[0]
-         // const visitor = arguments[1]
-         // }
-       };
-       SpatialIndex.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       SpatialIndex.prototype.getClass = function getClass () {
-         return SpatialIndex
-       };
+             var isHiddenPreset = !context.inIntro() && !!hiddenPresetFeaturesId && (_currentPresets.length !== 1 || item.preset !== _currentPresets[0]);
+             select(this).classed('disabled', isHiddenPreset);
 
-       var AbstractNode = function AbstractNode () {
-         this._childBoundables = new ArrayList();
-         this._bounds = null;
-         this._level = null;
-         if (arguments.length === 0) ; else if (arguments.length === 1) {
-           var level = arguments[0];
-           this._level = level;
+             if (isHiddenPreset) {
+               var isAutoHidden = context.features().autoHidden(hiddenPresetFeaturesId);
+               select(this).call(uiTooltip().title(_t.html('inspector.hidden_preset.' + (isAutoHidden ? 'zoom' : 'manual'), {
+                 features: _t.html('feature.' + hiddenPresetFeaturesId + '.description')
+               })).placement(index < 2 ? 'bottom' : 'top'));
+             }
+           });
          }
-       };
 
-       var staticAccessors$22 = { serialVersionUID: { configurable: true } };
-       AbstractNode.prototype.getLevel = function getLevel () {
-         return this._level
-       };
-       AbstractNode.prototype.size = function size () {
-         return this._childBoundables.size()
-       };
-       AbstractNode.prototype.getChildBoundables = function getChildBoundables () {
-         return this._childBoundables
-       };
-       AbstractNode.prototype.addChildBoundable = function addChildBoundable (childBoundable) {
-         Assert.isTrue(this._bounds === null);
-         this._childBoundables.add(childBoundable);
-       };
-       AbstractNode.prototype.isEmpty = function isEmpty () {
-         return this._childBoundables.isEmpty()
-       };
-       AbstractNode.prototype.getBounds = function getBounds () {
-         if (this._bounds === null) {
-           this._bounds = this.computeBounds();
-         }
-         return this._bounds
-       };
-       AbstractNode.prototype.interfaces_ = function interfaces_ () {
-         return [Boundable, Serializable]
-       };
-       AbstractNode.prototype.getClass = function getClass () {
-         return AbstractNode
-       };
-       staticAccessors$22.serialVersionUID.get = function () { return 6493722185909573708 };
+         presetList.autofocus = function (val) {
+           if (!arguments.length) return _autofocus;
+           _autofocus = val;
+           return presetList;
+         };
 
-       Object.defineProperties( AbstractNode, staticAccessors$22 );
+         presetList.entityIDs = function (val) {
+           if (!arguments.length) return _entityIDs;
+           _entityIDs = val;
 
-       var Collections = function Collections () {};
+           if (_entityIDs && _entityIDs.length) {
+             var presets = _entityIDs.map(function (entityID) {
+               return _mainPresetIndex.match(context.entity(entityID), context.graph());
+             });
 
-       Collections.reverseOrder = function reverseOrder () {
-         return {
-           compare: function compare (a, b) {
-             return b.compareTo(a)
+             presetList.presets(presets);
            }
-         }
-       };
-       Collections.min = function min (l) {
-         Collections.sort(l);
-         return l.get(0)
-       };
-       Collections.sort = function sort (l, c) {
-         var a = l.toArray();
-         if (c) {
-           Arrays.sort(a, c);
-         } else {
-           Arrays.sort(a);
-         }
-         var i = l.iterator();
-         for (var pos = 0, alen = a.length; pos < alen; pos++) {
-           i.next();
-           i.set(a[pos]);
-         }
-       };
-       Collections.singletonList = function singletonList (o) {
-         var arrayList = new ArrayList();
-         arrayList.add(o);
-         return arrayList
-       };
 
-       var BoundablePair = function BoundablePair () {
-         this._boundable1 = null;
-         this._boundable2 = null;
-         this._distance = null;
-         this._itemDistance = null;
-         var boundable1 = arguments[0];
-         var boundable2 = arguments[1];
-         var itemDistance = arguments[2];
-         this._boundable1 = boundable1;
-         this._boundable2 = boundable2;
-         this._itemDistance = itemDistance;
-         this._distance = this.distance();
-       };
-       BoundablePair.prototype.expandToQueue = function expandToQueue (priQ, minDistance) {
-         var isComp1 = BoundablePair.isComposite(this._boundable1);
-         var isComp2 = BoundablePair.isComposite(this._boundable2);
-         if (isComp1 && isComp2) {
-           if (BoundablePair.area(this._boundable1) > BoundablePair.area(this._boundable2)) {
-             this.expand(this._boundable1, this._boundable2, priQ, minDistance);
-             return null
-           } else {
-             this.expand(this._boundable2, this._boundable1, priQ, minDistance);
-             return null
-           }
-         } else if (isComp1) {
-           this.expand(this._boundable1, this._boundable2, priQ, minDistance);
-           return null
-         } else if (isComp2) {
-           this.expand(this._boundable2, this._boundable1, priQ, minDistance);
-           return null
-         }
-         throw new IllegalArgumentException('neither boundable is composite')
-       };
-       BoundablePair.prototype.isLeaves = function isLeaves () {
-         return !(BoundablePair.isComposite(this._boundable1) || BoundablePair.isComposite(this._boundable2))
-       };
-       BoundablePair.prototype.compareTo = function compareTo (o) {
-         var nd = o;
-         if (this._distance < nd._distance) { return -1 }
-         if (this._distance > nd._distance) { return 1 }
-         return 0
-       };
-       BoundablePair.prototype.expand = function expand (bndComposite, bndOther, priQ, minDistance) {
-           var this$1 = this;
+           return presetList;
+         };
 
-         var children = bndComposite.getChildBoundables();
-         for (var i = children.iterator(); i.hasNext();) {
-           var child = i.next();
-           var bp = new BoundablePair(child, bndOther, this$1._itemDistance);
-           if (bp.getDistance() < minDistance) {
-             priQ.add(bp);
-           }
-         }
-       };
-       BoundablePair.prototype.getBoundable = function getBoundable (i) {
-         if (i === 0) { return this._boundable1 }
-         return this._boundable2
-       };
-       BoundablePair.prototype.getDistance = function getDistance () {
-         return this._distance
-       };
-       BoundablePair.prototype.distance = function distance () {
-         if (this.isLeaves()) {
-           return this._itemDistance.distance(this._boundable1, this._boundable2)
-         }
-         return this._boundable1.getBounds().distance(this._boundable2.getBounds())
-       };
-       BoundablePair.prototype.interfaces_ = function interfaces_ () {
-         return [Comparable]
-       };
-       BoundablePair.prototype.getClass = function getClass () {
-         return BoundablePair
-       };
-       BoundablePair.area = function area (b) {
-         return b.getBounds().getArea()
-       };
-       BoundablePair.isComposite = function isComposite (item) {
-         return item instanceof AbstractNode
-       };
+         presetList.presets = function (val) {
+           if (!arguments.length) return _currentPresets;
+           _currentPresets = val;
+           return presetList;
+         };
 
-       var AbstractSTRtree = function AbstractSTRtree () {
-         this._root = null;
-         this._built = false;
-         this._itemBoundables = new ArrayList();
-         this._nodeCapacity = null;
-         if (arguments.length === 0) {
-           var nodeCapacity = AbstractSTRtree.DEFAULT_NODE_CAPACITY;
-           this._nodeCapacity = nodeCapacity;
-         } else if (arguments.length === 1) {
-           var nodeCapacity$1 = arguments[0];
-           Assert.isTrue(nodeCapacity$1 > 1, 'Node capacity must be greater than 1');
-           this._nodeCapacity = nodeCapacity$1;
-         }
-       };
+         function entityGeometries() {
+           var counts = {};
 
-       var staticAccessors$23 = { IntersectsOp: { configurable: true },serialVersionUID: { configurable: true },DEFAULT_NODE_CAPACITY: { configurable: true } };
-       AbstractSTRtree.prototype.getNodeCapacity = function getNodeCapacity () {
-         return this._nodeCapacity
-       };
-       AbstractSTRtree.prototype.lastNode = function lastNode (nodes) {
-         return nodes.get(nodes.size() - 1)
-       };
-       AbstractSTRtree.prototype.size = function size () {
-           var this$1 = this;
+           for (var i in _entityIDs) {
+             var entityID = _entityIDs[i];
+             var entity = context.entity(entityID);
+             var geometry = entity.geometry(context.graph()); // Treat entities on addr:interpolation lines as points, not vertices (#3241)
 
-         if (arguments.length === 0) {
-           if (this.isEmpty()) {
-             return 0
-           }
-           this.build();
-           return this.size(this._root)
-         } else if (arguments.length === 1) {
-           var node = arguments[0];
-           var size = 0;
-           for (var i = node.getChildBoundables().iterator(); i.hasNext();) {
-             var childBoundable = i.next();
-             if (childBoundable instanceof AbstractNode) {
-               size += this$1.size(childBoundable);
-             } else if (childBoundable instanceof ItemBoundable) {
-               size += 1;
-             }
-           }
-           return size
-         }
-       };
-       AbstractSTRtree.prototype.removeItem = function removeItem (node, item) {
-         var childToRemove = null;
-         for (var i = node.getChildBoundables().iterator(); i.hasNext();) {
-           var childBoundable = i.next();
-           if (childBoundable instanceof ItemBoundable) {
-             if (childBoundable.getItem() === item) { childToRemove = childBoundable; }
-           }
-         }
-         if (childToRemove !== null) {
-           node.getChildBoundables().remove(childToRemove);
-           return true
-         }
-         return false
-       };
-       AbstractSTRtree.prototype.itemsTree = function itemsTree () {
-           var this$1 = this;
-
-         if (arguments.length === 0) {
-           this.build();
-           var valuesTree = this.itemsTree(this._root);
-           if (valuesTree === null) { return new ArrayList() }
-           return valuesTree
-         } else if (arguments.length === 1) {
-           var node = arguments[0];
-           var valuesTreeForNode = new ArrayList();
-           for (var i = node.getChildBoundables().iterator(); i.hasNext();) {
-             var childBoundable = i.next();
-             if (childBoundable instanceof AbstractNode) {
-               var valuesTreeForChild = this$1.itemsTree(childBoundable);
-               if (valuesTreeForChild !== null) { valuesTreeForNode.add(valuesTreeForChild); }
-             } else if (childBoundable instanceof ItemBoundable) {
-               valuesTreeForNode.add(childBoundable.getItem());
-             } else {
-               Assert.shouldNeverReachHere();
+             if (geometry === 'vertex' && entity.isOnAddressLine(context.graph())) {
+               geometry = 'point';
              }
-           }
-           if (valuesTreeForNode.size() <= 0) { return null }
-           return valuesTreeForNode
-         }
-       };
-       AbstractSTRtree.prototype.insert = function insert (bounds, item) {
-         Assert.isTrue(!this._built, 'Cannot insert items into an STR packed R-tree after it has been built.');
-         this._itemBoundables.add(new ItemBoundable(bounds, item));
-       };
-       AbstractSTRtree.prototype.boundablesAtLevel = function boundablesAtLevel () {
-           var this$1 = this;
 
-         if (arguments.length === 1) {
-           var level = arguments[0];
-           var boundables = new ArrayList();
-           this.boundablesAtLevel(level, this._root, boundables);
-           return boundables
-         } else if (arguments.length === 3) {
-           var level$1 = arguments[0];
-           var top = arguments[1];
-           var boundables$1 = arguments[2];
-           Assert.isTrue(level$1 > -2);
-           if (top.getLevel() === level$1) {
-             boundables$1.add(top);
-             return null
-           }
-           for (var i = top.getChildBoundables().iterator(); i.hasNext();) {
-             var boundable = i.next();
-             if (boundable instanceof AbstractNode) {
-               this$1.boundablesAtLevel(level$1, boundable, boundables$1);
-             } else {
-               Assert.isTrue(boundable instanceof ItemBoundable);
-               if (level$1 === -1) {
-                 boundables$1.add(boundable);
-               }
-             }
+             if (!counts[geometry]) counts[geometry] = 0;
+             counts[geometry] += 1;
            }
-           return null
+
+           return Object.keys(counts).sort(function (geom1, geom2) {
+             return counts[geom2] - counts[geom1];
+           });
          }
-       };
-       AbstractSTRtree.prototype.query = function query () {
-           var this$1 = this;
 
-         if (arguments.length === 1) {
-           var searchBounds = arguments[0];
-           this.build();
-           var matches = new ArrayList();
-           if (this.isEmpty()) {
-             return matches
-           }
-           if (this.getIntersectsOp().intersects(this._root.getBounds(), searchBounds)) {
-             this.query(searchBounds, this._root, matches);
-           }
-           return matches
-         } else if (arguments.length === 2) {
-           var searchBounds$1 = arguments[0];
-           var visitor = arguments[1];
-           this.build();
-           if (this.isEmpty()) {
-             return null
-           }
-           if (this.getIntersectsOp().intersects(this._root.getBounds(), searchBounds$1)) {
-             this.query(searchBounds$1, this._root, visitor);
-           }
-         } else if (arguments.length === 3) {
-           if (hasInterface(arguments[2], ItemVisitor) && (arguments[0] instanceof Object && arguments[1] instanceof AbstractNode)) {
-             var searchBounds$2 = arguments[0];
-             var node = arguments[1];
-             var visitor$1 = arguments[2];
-             var childBoundables = node.getChildBoundables();
-             for (var i = 0; i < childBoundables.size(); i++) {
-               var childBoundable = childBoundables.get(i);
-               if (!this$1.getIntersectsOp().intersects(childBoundable.getBounds(), searchBounds$2)) {
-                 continue
-               }
-               if (childBoundable instanceof AbstractNode) {
-                 this$1.query(searchBounds$2, childBoundable, visitor$1);
-               } else if (childBoundable instanceof ItemBoundable) {
-                 visitor$1.visitItem(childBoundable.getItem());
-               } else {
-                 Assert.shouldNeverReachHere();
-               }
-             }
-           } else if (hasInterface(arguments[2], List) && (arguments[0] instanceof Object && arguments[1] instanceof AbstractNode)) {
-             var searchBounds$3 = arguments[0];
-             var node$1 = arguments[1];
-             var matches$1 = arguments[2];
-             var childBoundables$1 = node$1.getChildBoundables();
-             for (var i$1 = 0; i$1 < childBoundables$1.size(); i$1++) {
-               var childBoundable$1 = childBoundables$1.get(i$1);
-               if (!this$1.getIntersectsOp().intersects(childBoundable$1.getBounds(), searchBounds$3)) {
-                 continue
-               }
-               if (childBoundable$1 instanceof AbstractNode) {
-                 this$1.query(searchBounds$3, childBoundable$1, matches$1);
-               } else if (childBoundable$1 instanceof ItemBoundable) {
-                 matches$1.add(childBoundable$1.getItem());
-               } else {
-                 Assert.shouldNeverReachHere();
-               }
-             }
-           }
+         function combinedEntityExtent() {
+           return _entityIDs.reduce(function (extent, entityID) {
+             var entity = context.graph().entity(entityID);
+             return extent.extend(entity.extent(context.graph()));
+           }, geoExtent());
          }
-       };
-       AbstractSTRtree.prototype.build = function build () {
-         if (this._built) { return null }
-         this._root = this._itemBoundables.isEmpty() ? this.createNode(0) : this.createHigherLevels(this._itemBoundables, -1);
-         this._itemBoundables = null;
-         this._built = true;
-       };
-       AbstractSTRtree.prototype.getRoot = function getRoot () {
-         this.build();
-         return this._root
-       };
-       AbstractSTRtree.prototype.remove = function remove () {
-           var this$1 = this;
 
-         if (arguments.length === 2) {
-           var searchBounds = arguments[0];
-           var item = arguments[1];
-           this.build();
-           if (this.getIntersectsOp().intersects(this._root.getBounds(), searchBounds)) {
-             return this.remove(searchBounds, this._root, item)
-           }
-           return false
-         } else if (arguments.length === 3) {
-           var searchBounds$1 = arguments[0];
-           var node = arguments[1];
-           var item$1 = arguments[2];
-           var found = this.removeItem(node, item$1);
-           if (found) { return true }
-           var childToPrune = null;
-           for (var i = node.getChildBoundables().iterator(); i.hasNext();) {
-             var childBoundable = i.next();
-             if (!this$1.getIntersectsOp().intersects(childBoundable.getBounds(), searchBounds$1)) {
-               continue
-             }
-             if (childBoundable instanceof AbstractNode) {
-               found = this$1.remove(searchBounds$1, childBoundable, item$1);
-               if (found) {
-                 childToPrune = childBoundable;
-                 break
-               }
-             }
+         return utilRebind(presetList, dispatch$1, 'on');
+       }
+
+       function uiInspector(context) {
+         var presetList = uiPresetList(context);
+         var entityEditor = uiEntityEditor(context);
+         var wrap = select(null),
+             presetPane = select(null),
+             editorPane = select(null);
+         var _state = 'select';
+
+         var _entityIDs;
+
+         var _newFeature = false;
+
+         function inspector(selection) {
+           presetList.entityIDs(_entityIDs).autofocus(_newFeature).on('choose', inspector.setPreset).on('cancel', function () {
+             inspector.setPreset();
+           });
+           entityEditor.state(_state).entityIDs(_entityIDs).on('choose', inspector.showList);
+           wrap = selection.selectAll('.panewrap').data([0]);
+           var enter = wrap.enter().append('div').attr('class', 'panewrap');
+           enter.append('div').attr('class', 'preset-list-pane pane');
+           enter.append('div').attr('class', 'entity-editor-pane pane');
+           wrap = wrap.merge(enter);
+           presetPane = wrap.selectAll('.preset-list-pane');
+           editorPane = wrap.selectAll('.entity-editor-pane');
+
+           function shouldDefaultToPresetList() {
+             // always show the inspector on hover
+             if (_state !== 'select') return false; // can only change preset on single selection
+
+             if (_entityIDs.length !== 1) return false;
+             var entityID = _entityIDs[0];
+             var entity = context.hasEntity(entityID);
+             if (!entity) return false; // default to inspector if there are already tags
+
+             if (entity.hasNonGeometryTags()) return false; // prompt to select preset if feature is new and untagged
+
+             if (_newFeature) return true; // all existing features except vertices should default to inspector
+
+             if (entity.geometry(context.graph()) !== 'vertex') return false; // show vertex relations if any
+
+             if (context.graph().parentRelations(entity).length) return false; // show vertex issues if there are any
+
+             if (context.validator().getEntityIssues(entityID).length) return false; // show turn retriction editor for junction vertices
+
+             if (entity.isHighwayIntersection(context.graph())) return false; // otherwise show preset list for uninteresting vertices
+
+             return true;
            }
-           if (childToPrune !== null) {
-             if (childToPrune.getChildBoundables().isEmpty()) {
-               node.getChildBoundables().remove(childToPrune);
-             }
+
+           if (shouldDefaultToPresetList()) {
+             wrap.style('right', '-100%');
+             editorPane.classed('hide', true);
+             presetPane.classed('hide', false).call(presetList);
+           } else {
+             wrap.style('right', '0%');
+             presetPane.classed('hide', true);
+             editorPane.classed('hide', false).call(entityEditor);
            }
-           return found
-         }
-       };
-       AbstractSTRtree.prototype.createHigherLevels = function createHigherLevels (boundablesOfALevel, level) {
-         Assert.isTrue(!boundablesOfALevel.isEmpty());
-         var parentBoundables = this.createParentBoundables(boundablesOfALevel, level + 1);
-         if (parentBoundables.size() === 1) {
-           return parentBoundables.get(0)
+
+           var footer = selection.selectAll('.footer').data([0]);
+           footer = footer.enter().append('div').attr('class', 'footer').merge(footer);
+           footer.call(uiViewOnOSM(context).what(context.hasEntity(_entityIDs.length === 1 && _entityIDs[0])));
          }
-         return this.createHigherLevels(parentBoundables, level + 1)
-       };
-       AbstractSTRtree.prototype.depth = function depth () {
-           var this$1 = this;
 
-         if (arguments.length === 0) {
-           if (this.isEmpty()) {
-             return 0
+         inspector.showList = function (presets) {
+           presetPane.classed('hide', false);
+           wrap.transition().styleTween('right', function () {
+             return interpolate('0%', '-100%');
+           }).on('end', function () {
+             editorPane.classed('hide', true);
+           });
+
+           if (presets) {
+             presetList.presets(presets);
            }
-           this.build();
-           return this.depth(this._root)
-         } else if (arguments.length === 1) {
-           var node = arguments[0];
-           var maxChildDepth = 0;
-           for (var i = node.getChildBoundables().iterator(); i.hasNext();) {
-             var childBoundable = i.next();
-             if (childBoundable instanceof AbstractNode) {
-               var childDepth = this$1.depth(childBoundable);
-               if (childDepth > maxChildDepth) { maxChildDepth = childDepth; }
+
+           presetPane.call(presetList.autofocus(true));
+         };
+
+         inspector.setPreset = function (preset) {
+           // upon setting multipolygon, go to the area preset list instead of the editor
+           if (preset && preset.id === 'type/multipolygon') {
+             presetPane.call(presetList.autofocus(true));
+           } else {
+             editorPane.classed('hide', false);
+             wrap.transition().styleTween('right', function () {
+               return interpolate('-100%', '0%');
+             }).on('end', function () {
+               presetPane.classed('hide', true);
+             });
+
+             if (preset) {
+               entityEditor.presets([preset]);
              }
+
+             editorPane.call(entityEditor);
            }
-           return maxChildDepth + 1
-         }
-       };
-       AbstractSTRtree.prototype.createParentBoundables = function createParentBoundables (childBoundables, newLevel) {
-           var this$1 = this;
-
-         Assert.isTrue(!childBoundables.isEmpty());
-         var parentBoundables = new ArrayList();
-         parentBoundables.add(this.createNode(newLevel));
-         var sortedChildBoundables = new ArrayList(childBoundables);
-         Collections.sort(sortedChildBoundables, this.getComparator());
-         for (var i = sortedChildBoundables.iterator(); i.hasNext();) {
-           var childBoundable = i.next();
-           if (this$1.lastNode(parentBoundables).getChildBoundables().size() === this$1.getNodeCapacity()) {
-             parentBoundables.add(this$1.createNode(newLevel));
-           }
-           this$1.lastNode(parentBoundables).addChildBoundable(childBoundable);
-         }
-         return parentBoundables
-       };
-       AbstractSTRtree.prototype.isEmpty = function isEmpty () {
-         if (!this._built) { return this._itemBoundables.isEmpty() }
-         return this._root.isEmpty()
-       };
-       AbstractSTRtree.prototype.interfaces_ = function interfaces_ () {
-         return [Serializable]
-       };
-       AbstractSTRtree.prototype.getClass = function getClass () {
-         return AbstractSTRtree
-       };
-       AbstractSTRtree.compareDoubles = function compareDoubles (a, b) {
-         return a > b ? 1 : a < b ? -1 : 0
-       };
-       staticAccessors$23.IntersectsOp.get = function () { return IntersectsOp };
-       staticAccessors$23.serialVersionUID.get = function () { return -3886435814360241337 };
-       staticAccessors$23.DEFAULT_NODE_CAPACITY.get = function () { return 10 };
+         };
+
+         inspector.state = function (val) {
+           if (!arguments.length) return _state;
+           _state = val;
+           entityEditor.state(_state); // remove any old field help overlay that might have gotten attached to the inspector
+
+           context.container().selectAll('.field-help-body').remove();
+           return inspector;
+         };
+
+         inspector.entityIDs = function (val) {
+           if (!arguments.length) return _entityIDs;
+           _entityIDs = val;
+           return inspector;
+         };
+
+         inspector.newFeature = function (val) {
+           if (!arguments.length) return _newFeature;
+           _newFeature = val;
+           return inspector;
+         };
+
+         return inspector;
+       }
+
+       function uiSidebar(context) {
+         var inspector = uiInspector(context);
+         var dataEditor = uiDataEditor(context);
+         var noteEditor = uiNoteEditor(context);
+         var improveOsmEditor = uiImproveOsmEditor(context);
+         var keepRightEditor = uiKeepRightEditor(context);
+         var osmoseEditor = uiOsmoseEditor(context);
 
-       Object.defineProperties( AbstractSTRtree, staticAccessors$23 );
+         var _current;
 
-       var IntersectsOp = function IntersectsOp () {};
+         var _wasData = false;
+         var _wasNote = false;
+         var _wasQaItem = false; // use pointer events on supported platforms; fallback to mouse events
 
-       var ItemDistance = function ItemDistance () {};
+         var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
 
-       ItemDistance.prototype.distance = function distance (item1, item2) {};
-       ItemDistance.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       ItemDistance.prototype.getClass = function getClass () {
-         return ItemDistance
-       };
+         function sidebar(selection) {
+           var container = context.container();
+           var minWidth = 240;
+           var sidebarWidth;
+           var containerWidth;
+           var dragOffset; // Set the initial width constraints
+
+           selection.style('min-width', minWidth + 'px').style('max-width', '400px').style('width', '33.3333%');
+           var resizer = selection.append('div').attr('class', 'sidebar-resizer').on(_pointerPrefix + 'down.sidebar-resizer', pointerdown);
+           var downPointerId, lastClientX, containerLocGetter;
+
+           function pointerdown(d3_event) {
+             if (downPointerId) return;
+             if ('button' in d3_event && d3_event.button !== 0) return;
+             downPointerId = d3_event.pointerId || 'mouse';
+             lastClientX = d3_event.clientX;
+             containerLocGetter = utilFastMouse(container.node()); // offset from edge of sidebar-resizer
+
+             dragOffset = utilFastMouse(resizer.node())(d3_event)[0] - 1;
+             sidebarWidth = selection.node().getBoundingClientRect().width;
+             containerWidth = container.node().getBoundingClientRect().width;
+             var widthPct = sidebarWidth / containerWidth * 100;
+             selection.style('width', widthPct + '%') // lock in current width
+             .style('max-width', '85%'); // but allow larger widths
+
+             resizer.classed('dragging', true);
+             select(window).on('touchmove.sidebar-resizer', function (d3_event) {
+               // disable page scrolling while resizing on touch input
+               d3_event.preventDefault();
+             }, {
+               passive: false
+             }).on(_pointerPrefix + 'move.sidebar-resizer', pointermove).on(_pointerPrefix + 'up.sidebar-resizer pointercancel.sidebar-resizer', pointerup);
+           }
+
+           function pointermove(d3_event) {
+             if (downPointerId !== (d3_event.pointerId || 'mouse')) return;
+             d3_event.preventDefault();
+             var dx = d3_event.clientX - lastClientX;
+             lastClientX = d3_event.clientX;
+             var isRTL = _mainLocalizer.textDirection() === 'rtl';
+             var scaleX = isRTL ? 0 : 1;
+             var xMarginProperty = isRTL ? 'margin-right' : 'margin-left';
+             var x = containerLocGetter(d3_event)[0] - dragOffset;
+             sidebarWidth = isRTL ? containerWidth - x : x;
+             var isCollapsed = selection.classed('collapsed');
+             var shouldCollapse = sidebarWidth < minWidth;
+             selection.classed('collapsed', shouldCollapse);
+
+             if (shouldCollapse) {
+               if (!isCollapsed) {
+                 selection.style(xMarginProperty, '-400px').style('width', '400px');
+                 context.ui().onResize([(sidebarWidth - dx) * scaleX, 0]);
+               }
+             } else {
+               var widthPct = sidebarWidth / containerWidth * 100;
+               selection.style(xMarginProperty, null).style('width', widthPct + '%');
 
-       var STRtree = (function (AbstractSTRtree$$1) {
-         function STRtree (nodeCapacity) {
-           nodeCapacity = nodeCapacity || STRtree.DEFAULT_NODE_CAPACITY;
-           AbstractSTRtree$$1.call(this, nodeCapacity);
-         }
-
-         if ( AbstractSTRtree$$1 ) STRtree.__proto__ = AbstractSTRtree$$1;
-         STRtree.prototype = Object.create( AbstractSTRtree$$1 && AbstractSTRtree$$1.prototype );
-         STRtree.prototype.constructor = STRtree;
-
-         var staticAccessors = { STRtreeNode: { configurable: true },serialVersionUID: { configurable: true },xComparator: { configurable: true },yComparator: { configurable: true },intersectsOp: { configurable: true },DEFAULT_NODE_CAPACITY: { configurable: true } };
-         STRtree.prototype.createParentBoundablesFromVerticalSlices = function createParentBoundablesFromVerticalSlices (verticalSlices, newLevel) {
-           var this$1 = this;
-
-           Assert.isTrue(verticalSlices.length > 0);
-           var parentBoundables = new ArrayList();
-           for (var i = 0; i < verticalSlices.length; i++) {
-             parentBoundables.addAll(this$1.createParentBoundablesFromVerticalSlice(verticalSlices[i], newLevel));
-           }
-           return parentBoundables
-         };
-         STRtree.prototype.createNode = function createNode (level) {
-           return new STRtreeNode(level)
-         };
-         STRtree.prototype.size = function size () {
-           if (arguments.length === 0) {
-             return AbstractSTRtree$$1.prototype.size.call(this)
-           } else { return AbstractSTRtree$$1.prototype.size.apply(this, arguments) }
-         };
-         STRtree.prototype.insert = function insert () {
-           if (arguments.length === 2) {
-             var itemEnv = arguments[0];
-             var item = arguments[1];
-             if (itemEnv.isNull()) {
-               return null
-             }
-             AbstractSTRtree$$1.prototype.insert.call(this, itemEnv, item);
-           } else { return AbstractSTRtree$$1.prototype.insert.apply(this, arguments) }
-         };
-         STRtree.prototype.getIntersectsOp = function getIntersectsOp () {
-           return STRtree.intersectsOp
-         };
-         STRtree.prototype.verticalSlices = function verticalSlices (childBoundables, sliceCount) {
-           var sliceCapacity = Math.trunc(Math.ceil(childBoundables.size() / sliceCount));
-           var slices = new Array(sliceCount).fill(null);
-           var i = childBoundables.iterator();
-           for (var j = 0; j < sliceCount; j++) {
-             slices[j] = new ArrayList();
-             var boundablesAddedToSlice = 0;
-             while (i.hasNext() && boundablesAddedToSlice < sliceCapacity) {
-               var childBoundable = i.next();
-               slices[j].add(childBoundable);
-               boundablesAddedToSlice++;
-             }
-           }
-           return slices
-         };
-         STRtree.prototype.query = function query () {
-           if (arguments.length === 1) {
-             var searchEnv = arguments[0];
-             return AbstractSTRtree$$1.prototype.query.call(this, searchEnv)
-           } else if (arguments.length === 2) {
-             var searchEnv$1 = arguments[0];
-             var visitor = arguments[1];
-             AbstractSTRtree$$1.prototype.query.call(this, searchEnv$1, visitor);
-           } else if (arguments.length === 3) {
-             if (hasInterface(arguments[2], ItemVisitor) && (arguments[0] instanceof Object && arguments[1] instanceof AbstractNode)) {
-               var searchBounds = arguments[0];
-               var node = arguments[1];
-               var visitor$1 = arguments[2];
-               AbstractSTRtree$$1.prototype.query.call(this, searchBounds, node, visitor$1);
-             } else if (hasInterface(arguments[2], List) && (arguments[0] instanceof Object && arguments[1] instanceof AbstractNode)) {
-               var searchBounds$1 = arguments[0];
-               var node$1 = arguments[1];
-               var matches = arguments[2];
-               AbstractSTRtree$$1.prototype.query.call(this, searchBounds$1, node$1, matches);
-             }
-           }
-         };
-         STRtree.prototype.getComparator = function getComparator () {
-           return STRtree.yComparator
-         };
-         STRtree.prototype.createParentBoundablesFromVerticalSlice = function createParentBoundablesFromVerticalSlice (childBoundables, newLevel) {
-           return AbstractSTRtree$$1.prototype.createParentBoundables.call(this, childBoundables, newLevel)
-         };
-         STRtree.prototype.remove = function remove () {
-           if (arguments.length === 2) {
-             var itemEnv = arguments[0];
-             var item = arguments[1];
-             return AbstractSTRtree$$1.prototype.remove.call(this, itemEnv, item)
-           } else { return AbstractSTRtree$$1.prototype.remove.apply(this, arguments) }
-         };
-         STRtree.prototype.depth = function depth () {
-           if (arguments.length === 0) {
-             return AbstractSTRtree$$1.prototype.depth.call(this)
-           } else { return AbstractSTRtree$$1.prototype.depth.apply(this, arguments) }
-         };
-         STRtree.prototype.createParentBoundables = function createParentBoundables (childBoundables, newLevel) {
-           Assert.isTrue(!childBoundables.isEmpty());
-           var minLeafCount = Math.trunc(Math.ceil(childBoundables.size() / this.getNodeCapacity()));
-           var sortedChildBoundables = new ArrayList(childBoundables);
-           Collections.sort(sortedChildBoundables, STRtree.xComparator);
-           var verticalSlices = this.verticalSlices(sortedChildBoundables, Math.trunc(Math.ceil(Math.sqrt(minLeafCount))));
-           return this.createParentBoundablesFromVerticalSlices(verticalSlices, newLevel)
-         };
-         STRtree.prototype.nearestNeighbour = function nearestNeighbour () {
-           if (arguments.length === 1) {
-             if (hasInterface(arguments[0], ItemDistance)) {
-               var itemDist = arguments[0];
-               var bp = new BoundablePair(this.getRoot(), this.getRoot(), itemDist);
-               return this.nearestNeighbour(bp)
-             } else if (arguments[0] instanceof BoundablePair) {
-               var initBndPair = arguments[0];
-               return this.nearestNeighbour(initBndPair, Double.POSITIVE_INFINITY)
-             }
-           } else if (arguments.length === 2) {
-             if (arguments[0] instanceof STRtree && hasInterface(arguments[1], ItemDistance)) {
-               var tree = arguments[0];
-               var itemDist$1 = arguments[1];
-               var bp$1 = new BoundablePair(this.getRoot(), tree.getRoot(), itemDist$1);
-               return this.nearestNeighbour(bp$1)
-             } else if (arguments[0] instanceof BoundablePair && typeof arguments[1] === 'number') {
-               var initBndPair$1 = arguments[0];
-               var maxDistance = arguments[1];
-               var distanceLowerBound = maxDistance;
-               var minPair = null;
-               var priQ = new PriorityQueue();
-               priQ.add(initBndPair$1);
-               while (!priQ.isEmpty() && distanceLowerBound > 0.0) {
-                 var bndPair = priQ.poll();
-                 var currentDistance = bndPair.getDistance();
-                 if (currentDistance >= distanceLowerBound) { break }
-                 if (bndPair.isLeaves()) {
-                   distanceLowerBound = currentDistance;
-                   minPair = bndPair;
-                 } else {
-                   bndPair.expandToQueue(priQ, distanceLowerBound);
-                 }
+               if (isCollapsed) {
+                 context.ui().onResize([-sidebarWidth * scaleX, 0]);
+               } else {
+                 context.ui().onResize([-dx * scaleX, 0]);
                }
-               return [minPair.getBoundable(0).getItem(), minPair.getBoundable(1).getItem()]
-             }
-           } else if (arguments.length === 3) {
-             var env = arguments[0];
-             var item = arguments[1];
-             var itemDist$2 = arguments[2];
-             var bnd = new ItemBoundable(env, item);
-             var bp$2 = new BoundablePair(this.getRoot(), bnd, itemDist$2);
-             return this.nearestNeighbour(bp$2)[0]
-           }
-         };
-         STRtree.prototype.interfaces_ = function interfaces_ () {
-           return [SpatialIndex, Serializable]
-         };
-         STRtree.prototype.getClass = function getClass () {
-           return STRtree
-         };
-         STRtree.centreX = function centreX (e) {
-           return STRtree.avg(e.getMinX(), e.getMaxX())
-         };
-         STRtree.avg = function avg (a, b) {
-           return (a + b) / 2
-         };
-         STRtree.centreY = function centreY (e) {
-           return STRtree.avg(e.getMinY(), e.getMaxY())
-         };
-         staticAccessors.STRtreeNode.get = function () { return STRtreeNode };
-         staticAccessors.serialVersionUID.get = function () { return 259274702368956900 };
-         staticAccessors.xComparator.get = function () {
-           return {
-             interfaces_: function () {
-               return [Comparator]
-             },
-             compare: function (o1, o2) {
-               return AbstractSTRtree$$1.compareDoubles(STRtree.centreX(o1.getBounds()), STRtree.centreX(o2.getBounds()))
-             }
-           }
-         };
-         staticAccessors.yComparator.get = function () {
-           return {
-             interfaces_: function () {
-               return [Comparator]
-             },
-             compare: function (o1, o2) {
-               return AbstractSTRtree$$1.compareDoubles(STRtree.centreY(o1.getBounds()), STRtree.centreY(o2.getBounds()))
              }
            }
-         };
-         staticAccessors.intersectsOp.get = function () {
-           return {
-             interfaces_: function () {
-               return [AbstractSTRtree$$1.IntersectsOp]
-             },
-             intersects: function (aBounds, bBounds) {
-               return aBounds.intersects(bBounds)
-             }
+
+           function pointerup(d3_event) {
+             if (downPointerId !== (d3_event.pointerId || 'mouse')) return;
+             downPointerId = null;
+             resizer.classed('dragging', false);
+             select(window).on('touchmove.sidebar-resizer', null).on(_pointerPrefix + 'move.sidebar-resizer', null).on(_pointerPrefix + 'up.sidebar-resizer pointercancel.sidebar-resizer', null);
            }
-         };
-         staticAccessors.DEFAULT_NODE_CAPACITY.get = function () { return 10 };
 
-         Object.defineProperties( STRtree, staticAccessors );
+           var featureListWrap = selection.append('div').attr('class', 'feature-list-pane').call(uiFeatureList(context));
+           var inspectorWrap = selection.append('div').attr('class', 'inspector-hidden inspector-wrap');
 
-         return STRtree;
-       }(AbstractSTRtree));
+           var hoverModeSelect = function hoverModeSelect(targets) {
+             context.container().selectAll('.feature-list-item').classed('hover', false);
 
-       var STRtreeNode = (function (AbstractNode$$1) {
-         function STRtreeNode () {
-           var level = arguments[0];
-           AbstractNode$$1.call(this, level);
-         }
+             if (context.selectedIDs().length > 1 && targets && targets.length) {
+               var elements = context.container().selectAll('.feature-list-item').filter(function (node) {
+                 return targets.indexOf(node) !== -1;
+               });
 
-         if ( AbstractNode$$1 ) STRtreeNode.__proto__ = AbstractNode$$1;
-         STRtreeNode.prototype = Object.create( AbstractNode$$1 && AbstractNode$$1.prototype );
-         STRtreeNode.prototype.constructor = STRtreeNode;
-         STRtreeNode.prototype.computeBounds = function computeBounds () {
-           var bounds = null;
-           for (var i = this.getChildBoundables().iterator(); i.hasNext();) {
-             var childBoundable = i.next();
-             if (bounds === null) {
-               bounds = new Envelope(childBoundable.getBounds());
-             } else {
-               bounds.expandToInclude(childBoundable.getBounds());
+               if (!elements.empty()) {
+                 elements.classed('hover', true);
+               }
              }
-           }
-           return bounds
-         };
-         STRtreeNode.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         STRtreeNode.prototype.getClass = function getClass () {
-           return STRtreeNode
-         };
-
-         return STRtreeNode;
-       }(AbstractNode));
+           };
 
-       var SegmentPointComparator = function SegmentPointComparator () {};
+           sidebar.hoverModeSelect = throttle(hoverModeSelect, 200);
 
-       SegmentPointComparator.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       SegmentPointComparator.prototype.getClass = function getClass () {
-         return SegmentPointComparator
-       };
-       SegmentPointComparator.relativeSign = function relativeSign (x0, x1) {
-         if (x0 < x1) { return -1 }
-         if (x0 > x1) { return 1 }
-         return 0
-       };
-       SegmentPointComparator.compare = function compare (octant, p0, p1) {
-         if (p0.equals2D(p1)) { return 0 }
-         var xSign = SegmentPointComparator.relativeSign(p0.x, p1.x);
-         var ySign = SegmentPointComparator.relativeSign(p0.y, p1.y);
-         switch (octant) {
-           case 0:
-             return SegmentPointComparator.compareValue(xSign, ySign)
-           case 1:
-             return SegmentPointComparator.compareValue(ySign, xSign)
-           case 2:
-             return SegmentPointComparator.compareValue(ySign, -xSign)
-           case 3:
-             return SegmentPointComparator.compareValue(-xSign, ySign)
-           case 4:
-             return SegmentPointComparator.compareValue(-xSign, -ySign)
-           case 5:
-             return SegmentPointComparator.compareValue(-ySign, -xSign)
-           case 6:
-             return SegmentPointComparator.compareValue(-ySign, xSign)
-           case 7:
-             return SegmentPointComparator.compareValue(xSign, -ySign)
-         }
-         Assert.shouldNeverReachHere('invalid octant value');
-         return 0
-       };
-       SegmentPointComparator.compareValue = function compareValue (compareSign0, compareSign1) {
-         if (compareSign0 < 0) { return -1 }
-         if (compareSign0 > 0) { return 1 }
-         if (compareSign1 < 0) { return -1 }
-         if (compareSign1 > 0) { return 1 }
-         return 0
-       };
+           function hover(targets) {
+             var datum = targets && targets.length && targets[0];
 
-       var SegmentNode = function SegmentNode () {
-         this._segString = null;
-         this.coord = null;
-         this.segmentIndex = null;
-         this._segmentOctant = null;
-         this._isInterior = null;
-         var segString = arguments[0];
-         var coord = arguments[1];
-         var segmentIndex = arguments[2];
-         var segmentOctant = arguments[3];
-         this._segString = segString;
-         this.coord = new Coordinate(coord);
-         this.segmentIndex = segmentIndex;
-         this._segmentOctant = segmentOctant;
-         this._isInterior = !coord.equals2D(segString.getCoordinate(segmentIndex));
-       };
-       SegmentNode.prototype.getCoordinate = function getCoordinate () {
-         return this.coord
-       };
-       SegmentNode.prototype.print = function print (out) {
-         out.print(this.coord);
-         out.print(' seg # = ' + this.segmentIndex);
-       };
-       SegmentNode.prototype.compareTo = function compareTo (obj) {
-         var other = obj;
-         if (this.segmentIndex < other.segmentIndex) { return -1 }
-         if (this.segmentIndex > other.segmentIndex) { return 1 }
-         if (this.coord.equals2D(other.coord)) { return 0 }
-         return SegmentPointComparator.compare(this._segmentOctant, this.coord, other.coord)
-       };
-       SegmentNode.prototype.isEndPoint = function isEndPoint (maxSegmentIndex) {
-         if (this.segmentIndex === 0 && !this._isInterior) { return true }
-         if (this.segmentIndex === maxSegmentIndex) { return true }
-         return false
-       };
-       SegmentNode.prototype.isInterior = function isInterior () {
-         return this._isInterior
-       };
-       SegmentNode.prototype.interfaces_ = function interfaces_ () {
-         return [Comparable]
-       };
-       SegmentNode.prototype.getClass = function getClass () {
-         return SegmentNode
-       };
+             if (datum && datum.__featurehash__) {
+               // hovering on data
+               _wasData = true;
+               sidebar.show(dataEditor.datum(datum));
+               selection.selectAll('.sidebar-component').classed('inspector-hover', true);
+             } else if (datum instanceof osmNote) {
+               if (context.mode().id === 'drag-note') return;
+               _wasNote = true;
+               var osm = services.osm;
 
-       // import Iterator from '../../../../java/util/Iterator'
-       var SegmentNodeList = function SegmentNodeList () {
-         this._nodeMap = new TreeMap();
-         this._edge = null;
-         var edge = arguments[0];
-         this._edge = edge;
-       };
-       SegmentNodeList.prototype.getSplitCoordinates = function getSplitCoordinates () {
-           var this$1 = this;
-
-         var coordList = new CoordinateList();
-         this.addEndpoints();
-         var it = this.iterator();
-         var eiPrev = it.next();
-         while (it.hasNext()) {
-           var ei = it.next();
-           this$1.addEdgeCoordinates(eiPrev, ei, coordList);
-           eiPrev = ei;
-         }
-         return coordList.toCoordinateArray()
-       };
-       SegmentNodeList.prototype.addCollapsedNodes = function addCollapsedNodes () {
-           var this$1 = this;
+               if (osm) {
+                 datum = osm.getNote(datum.id); // marker may contain stale data - get latest
+               }
 
-         var collapsedVertexIndexes = new ArrayList();
-         this.findCollapsesFromInsertedNodes(collapsedVertexIndexes);
-         this.findCollapsesFromExistingVertices(collapsedVertexIndexes);
-         for (var it = collapsedVertexIndexes.iterator(); it.hasNext();) {
-           var vertexIndex = it.next().intValue();
-           this$1.add(this$1._edge.getCoordinate(vertexIndex), vertexIndex);
-         }
-       };
-       SegmentNodeList.prototype.print = function print (out) {
-         out.println('Intersections:');
-         for (var it = this.iterator(); it.hasNext();) {
-           var ei = it.next();
-           ei.print(out);
-         }
-       };
-       SegmentNodeList.prototype.findCollapsesFromExistingVertices = function findCollapsesFromExistingVertices (collapsedVertexIndexes) {
-           var this$1 = this;
+               sidebar.show(noteEditor.note(datum));
+               selection.selectAll('.sidebar-component').classed('inspector-hover', true);
+             } else if (datum instanceof QAItem) {
+               _wasQaItem = true;
+               var errService = services[datum.service];
 
-         for (var i = 0; i < this._edge.size() - 2; i++) {
-           var p0 = this$1._edge.getCoordinate(i);
-           // const p1 = this._edge.getCoordinate(i + 1)
-           var p2 = this$1._edge.getCoordinate(i + 2);
-           if (p0.equals2D(p2)) {
-             collapsedVertexIndexes.add(new Integer(i + 1));
-           }
-         }
-       };
-       SegmentNodeList.prototype.addEdgeCoordinates = function addEdgeCoordinates (ei0, ei1, coordList) {
-           var this$1 = this;
-
-         // let npts = ei1.segmentIndex - ei0.segmentIndex + 2
-         var lastSegStartPt = this._edge.getCoordinate(ei1.segmentIndex);
-         var useIntPt1 = ei1.isInterior() || !ei1.coord.equals2D(lastSegStartPt);
-         // if (!useIntPt1) {
-         // npts--
-         // }
-         // const ipt = 0
-         coordList.add(new Coordinate(ei0.coord), false);
-         for (var i = ei0.segmentIndex + 1; i <= ei1.segmentIndex; i++) {
-           coordList.add(this$1._edge.getCoordinate(i));
-         }
-         if (useIntPt1) {
-           coordList.add(new Coordinate(ei1.coord));
-         }
-       };
-       SegmentNodeList.prototype.iterator = function iterator () {
-         return this._nodeMap.values().iterator()
-       };
-       SegmentNodeList.prototype.addSplitEdges = function addSplitEdges (edgeList) {
-           var this$1 = this;
-
-         this.addEndpoints();
-         this.addCollapsedNodes();
-         var it = this.iterator();
-         var eiPrev = it.next();
-         while (it.hasNext()) {
-           var ei = it.next();
-           var newEdge = this$1.createSplitEdge(eiPrev, ei);
-           edgeList.add(newEdge);
-           eiPrev = ei;
-         }
-       };
-       SegmentNodeList.prototype.findCollapseIndex = function findCollapseIndex (ei0, ei1, collapsedVertexIndex) {
-         if (!ei0.coord.equals2D(ei1.coord)) { return false }
-         var numVerticesBetween = ei1.segmentIndex - ei0.segmentIndex;
-         if (!ei1.isInterior()) {
-           numVerticesBetween--;
-         }
-         if (numVerticesBetween === 1) {
-           collapsedVertexIndex[0] = ei0.segmentIndex + 1;
-           return true
-         }
-         return false
-       };
-       SegmentNodeList.prototype.findCollapsesFromInsertedNodes = function findCollapsesFromInsertedNodes (collapsedVertexIndexes) {
-           var this$1 = this;
-
-         var collapsedVertexIndex = new Array(1).fill(null);
-         var it = this.iterator();
-         var eiPrev = it.next();
-         while (it.hasNext()) {
-           var ei = it.next();
-           var isCollapsed = this$1.findCollapseIndex(eiPrev, ei, collapsedVertexIndex);
-           if (isCollapsed) { collapsedVertexIndexes.add(new Integer(collapsedVertexIndex[0])); }
-           eiPrev = ei;
-         }
-       };
-       SegmentNodeList.prototype.getEdge = function getEdge () {
-         return this._edge
-       };
-       SegmentNodeList.prototype.addEndpoints = function addEndpoints () {
-         var maxSegIndex = this._edge.size() - 1;
-         this.add(this._edge.getCoordinate(0), 0);
-         this.add(this._edge.getCoordinate(maxSegIndex), maxSegIndex);
-       };
-       SegmentNodeList.prototype.createSplitEdge = function createSplitEdge (ei0, ei1) {
-           var this$1 = this;
-
-         var npts = ei1.segmentIndex - ei0.segmentIndex + 2;
-         var lastSegStartPt = this._edge.getCoordinate(ei1.segmentIndex);
-         var useIntPt1 = ei1.isInterior() || !ei1.coord.equals2D(lastSegStartPt);
-         if (!useIntPt1) {
-           npts--;
-         }
-         var pts = new Array(npts).fill(null);
-         var ipt = 0;
-         pts[ipt++] = new Coordinate(ei0.coord);
-         for (var i = ei0.segmentIndex + 1; i <= ei1.segmentIndex; i++) {
-           pts[ipt++] = this$1._edge.getCoordinate(i);
-         }
-         if (useIntPt1) { pts[ipt] = new Coordinate(ei1.coord); }
-         return new NodedSegmentString(pts, this._edge.getData())
-       };
-       SegmentNodeList.prototype.add = function add (intPt, segmentIndex) {
-         var eiNew = new SegmentNode(this._edge, intPt, segmentIndex, this._edge.getSegmentOctant(segmentIndex));
-         var ei = this._nodeMap.get(eiNew);
-         if (ei !== null) {
-           Assert.isTrue(ei.coord.equals2D(intPt), 'Found equal nodes with different coordinates');
-           return ei
-         }
-         this._nodeMap.put(eiNew, eiNew);
-         return eiNew
-       };
-       SegmentNodeList.prototype.checkSplitEdgesCorrectness = function checkSplitEdgesCorrectness (splitEdges) {
-         var edgePts = this._edge.getCoordinates();
-         var split0 = splitEdges.get(0);
-         var pt0 = split0.getCoordinate(0);
-         if (!pt0.equals2D(edgePts[0])) { throw new RuntimeException('bad split edge start point at ' + pt0) }
-         var splitn = splitEdges.get(splitEdges.size() - 1);
-         var splitnPts = splitn.getCoordinates();
-         var ptn = splitnPts[splitnPts.length - 1];
-         if (!ptn.equals2D(edgePts[edgePts.length - 1])) { throw new RuntimeException('bad split edge end point at ' + ptn) }
-       };
-       SegmentNodeList.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       SegmentNodeList.prototype.getClass = function getClass () {
-         return SegmentNodeList
-       };
+               if (errService) {
+                 // marker may contain stale data - get latest
+                 datum = errService.getError(datum.id);
+               } // Currently only three possible services
 
 
+               var errEditor;
 
-       // class NodeVertexIterator {
-       //   constructor () {
-       //     this._nodeList = null
-       //     this._edge = null
-       //     this._nodeIt = null
-       //     this._currNode = null
-       //     this._nextNode = null
-       //     this._currSegIndex = 0
-       //     let nodeList = arguments[0]
-       //     this._nodeList = nodeList
-       //     this._edge = nodeList.getEdge()
-       //     this._nodeIt = nodeList.iterator()
-       //     this.readNextNode()
-       //   }
-       //   next () {
-       //     if (this._currNode === null) {
-       //       this._currNode = this._nextNode
-       //       this._currSegIndex = this._currNode.segmentIndex
-       //       this.readNextNode()
-       //       return this._currNode
-       //     }
-       //     if (this._nextNode === null) return null
-       //     if (this._nextNode.segmentIndex === this._currNode.segmentIndex) {
-       //       this._currNode = this._nextNode
-       //       this._currSegIndex = this._currNode.segmentIndex
-       //       this.readNextNode()
-       //       return this._currNode
-       //     }
-       //     if (this._nextNode.segmentIndex > this._currNode.segmentIndex) {}
-       //     return null
-       //   }
-       //   remove () {
-       //     // throw new UnsupportedOperationException(this.getClass().getName())
-       //   }
-       //   hasNext () {
-       //     if (this._nextNode === null) return false
-       //     return true
-       //   }
-       //   readNextNode () {
-       //     if (this._nodeIt.hasNext()) this._nextNode = this._nodeIt.next(); else this._nextNode = null
-       //   }
-       //   interfaces_ () {
-       //     return [Iterator]
-       //   }
-       //   getClass () {
-       //     return NodeVertexIterator
-       //   }
-       // }
+               if (datum.service === 'keepRight') {
+                 errEditor = keepRightEditor;
+               } else if (datum.service === 'osmose') {
+                 errEditor = osmoseEditor;
+               } else {
+                 errEditor = improveOsmEditor;
+               }
 
-       var Octant = function Octant () {};
+               context.container().selectAll('.qaItem.' + datum.service).classed('hover', function (d) {
+                 return d.id === datum.id;
+               });
+               sidebar.show(errEditor.error(datum));
+               selection.selectAll('.sidebar-component').classed('inspector-hover', true);
+             } else if (!_current && datum instanceof osmEntity) {
+               featureListWrap.classed('inspector-hidden', true);
+               inspectorWrap.classed('inspector-hidden', false).classed('inspector-hover', true);
 
-       Octant.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       Octant.prototype.getClass = function getClass () {
-         return Octant
-       };
-       Octant.octant = function octant () {
-         if (typeof arguments[0] === 'number' && typeof arguments[1] === 'number') {
-           var dx = arguments[0];
-           var dy = arguments[1];
-           if (dx === 0.0 && dy === 0.0) { throw new IllegalArgumentException('Cannot compute the octant for point ( ' + dx + ', ' + dy + ' )') }
-           var adx = Math.abs(dx);
-           var ady = Math.abs(dy);
-           if (dx >= 0) {
-             if (dy >= 0) {
-               if (adx >= ady) { return 0; } else { return 1 }
-             } else {
-               if (adx >= ady) { return 7; } else { return 6 }
-             }
-           } else {
-             if (dy >= 0) {
-               if (adx >= ady) { return 3; } else { return 2 }
-             } else {
-               if (adx >= ady) { return 4; } else { return 5 }
+               if (!inspector.entityIDs() || !utilArrayIdentical(inspector.entityIDs(), [datum.id]) || inspector.state() !== 'hover') {
+                 inspector.state('hover').entityIDs([datum.id]).newFeature(false);
+                 inspectorWrap.call(inspector);
+               }
+             } else if (!_current) {
+               featureListWrap.classed('inspector-hidden', false);
+               inspectorWrap.classed('inspector-hidden', true);
+               inspector.state('hide');
+             } else if (_wasData || _wasNote || _wasQaItem) {
+               _wasNote = false;
+               _wasData = false;
+               _wasQaItem = false;
+               context.container().selectAll('.note').classed('hover', false);
+               context.container().selectAll('.qaItem').classed('hover', false);
+               sidebar.hide();
              }
            }
-         } else if (arguments[0] instanceof Coordinate && arguments[1] instanceof Coordinate) {
-           var p0 = arguments[0];
-           var p1 = arguments[1];
-           var dx$1 = p1.x - p0.x;
-           var dy$1 = p1.y - p0.y;
-           if (dx$1 === 0.0 && dy$1 === 0.0) { throw new IllegalArgumentException('Cannot compute the octant for two identical points ' + p0) }
-           return Octant.octant(dx$1, dy$1)
-         }
-       };
 
-       var SegmentString = function SegmentString () {};
+           sidebar.hover = throttle(hover, 200);
 
-       SegmentString.prototype.getCoordinates = function getCoordinates () {};
-       SegmentString.prototype.size = function size () {};
-       SegmentString.prototype.getCoordinate = function getCoordinate (i) {};
-       SegmentString.prototype.isClosed = function isClosed () {};
-       SegmentString.prototype.setData = function setData (data) {};
-       SegmentString.prototype.getData = function getData () {};
-       SegmentString.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       SegmentString.prototype.getClass = function getClass () {
-         return SegmentString
-       };
+           sidebar.intersects = function (extent) {
+             var rect = selection.node().getBoundingClientRect();
+             return extent.intersects([context.projection.invert([0, rect.height]), context.projection.invert([rect.width, 0])]);
+           };
 
-       var NodableSegmentString = function NodableSegmentString () {};
+           sidebar.select = function (ids, newFeature) {
+             sidebar.hide();
 
-       NodableSegmentString.prototype.addIntersection = function addIntersection (intPt, segmentIndex) {};
-       NodableSegmentString.prototype.interfaces_ = function interfaces_ () {
-         return [SegmentString]
-       };
-       NodableSegmentString.prototype.getClass = function getClass () {
-         return NodableSegmentString
-       };
+             if (ids && ids.length) {
+               var entity = ids.length === 1 && context.entity(ids[0]);
 
-       var NodedSegmentString = function NodedSegmentString () {
-         this._nodeList = new SegmentNodeList(this);
-         this._pts = null;
-         this._data = null;
-         var pts = arguments[0];
-         var data = arguments[1];
-         this._pts = pts;
-         this._data = data;
-       };
-       NodedSegmentString.prototype.getCoordinates = function getCoordinates () {
-         return this._pts
-       };
-       NodedSegmentString.prototype.size = function size () {
-         return this._pts.length
-       };
-       NodedSegmentString.prototype.getCoordinate = function getCoordinate (i) {
-         return this._pts[i]
-       };
-       NodedSegmentString.prototype.isClosed = function isClosed () {
-         return this._pts[0].equals(this._pts[this._pts.length - 1])
-       };
-       NodedSegmentString.prototype.getSegmentOctant = function getSegmentOctant (index) {
-         if (index === this._pts.length - 1) { return -1 }
-         return this.safeOctant(this.getCoordinate(index), this.getCoordinate(index + 1))
-       };
-       NodedSegmentString.prototype.setData = function setData (data) {
-         this._data = data;
-       };
-       NodedSegmentString.prototype.safeOctant = function safeOctant (p0, p1) {
-         if (p0.equals2D(p1)) { return 0 }
-         return Octant.octant(p0, p1)
-       };
-       NodedSegmentString.prototype.getData = function getData () {
-         return this._data
-       };
-       NodedSegmentString.prototype.addIntersection = function addIntersection () {
-         if (arguments.length === 2) {
-           var intPt$1 = arguments[0];
-           var segmentIndex = arguments[1];
-           this.addIntersectionNode(intPt$1, segmentIndex);
-         } else if (arguments.length === 4) {
-           var li = arguments[0];
-           var segmentIndex$1 = arguments[1];
-           // const geomIndex = arguments[2]
-           var intIndex = arguments[3];
-           var intPt = new Coordinate(li.getIntersection(intIndex));
-           this.addIntersection(intPt, segmentIndex$1);
-         }
-       };
-       NodedSegmentString.prototype.toString = function toString () {
-         return WKTWriter.toLineString(new CoordinateArraySequence(this._pts))
-       };
-       NodedSegmentString.prototype.getNodeList = function getNodeList () {
-         return this._nodeList
-       };
-       NodedSegmentString.prototype.addIntersectionNode = function addIntersectionNode (intPt, segmentIndex) {
-         var normalizedSegmentIndex = segmentIndex;
-         var nextSegIndex = normalizedSegmentIndex + 1;
-         if (nextSegIndex < this._pts.length) {
-           var nextPt = this._pts[nextSegIndex];
-           if (intPt.equals2D(nextPt)) {
-             normalizedSegmentIndex = nextSegIndex;
-           }
-         }
-         var ei = this._nodeList.add(intPt, normalizedSegmentIndex);
-         return ei
-       };
-       NodedSegmentString.prototype.addIntersections = function addIntersections (li, segmentIndex, geomIndex) {
-           var this$1 = this;
+               if (entity && newFeature && selection.classed('collapsed')) {
+                 // uncollapse the sidebar
+                 var extent = entity.extent(context.graph());
+                 sidebar.expand(sidebar.intersects(extent));
+               }
 
-         for (var i = 0; i < li.getIntersectionNum(); i++) {
-           this$1.addIntersection(li, segmentIndex, geomIndex, i);
-         }
-       };
-       NodedSegmentString.prototype.interfaces_ = function interfaces_ () {
-         return [NodableSegmentString]
-       };
-       NodedSegmentString.prototype.getClass = function getClass () {
-         return NodedSegmentString
-       };
-       NodedSegmentString.getNodedSubstrings = function getNodedSubstrings () {
-         if (arguments.length === 1) {
-           var segStrings = arguments[0];
-           var resultEdgelist = new ArrayList();
-           NodedSegmentString.getNodedSubstrings(segStrings, resultEdgelist);
-           return resultEdgelist
-         } else if (arguments.length === 2) {
-           var segStrings$1 = arguments[0];
-           var resultEdgelist$1 = arguments[1];
-           for (var i = segStrings$1.iterator(); i.hasNext();) {
-             var ss = i.next();
-             ss.getNodeList().addSplitEdges(resultEdgelist$1);
-           }
-         }
-       };
+               featureListWrap.classed('inspector-hidden', true);
+               inspectorWrap.classed('inspector-hidden', false).classed('inspector-hover', false); // reload the UI even if the ids are the same since the entities
+               // themselves may have changed
 
-       var LineSegment = function LineSegment () {
-         this.p0 = null;
-         this.p1 = null;
-         if (arguments.length === 0) {
-           this.p0 = new Coordinate();
-           this.p1 = new Coordinate();
-         } else if (arguments.length === 1) {
-           var ls = arguments[0];
-           this.p0 = new Coordinate(ls.p0);
-           this.p1 = new Coordinate(ls.p1);
-         } else if (arguments.length === 2) {
-           this.p0 = arguments[0];
-           this.p1 = arguments[1];
-         } else if (arguments.length === 4) {
-           var x0 = arguments[0];
-           var y0 = arguments[1];
-           var x1 = arguments[2];
-           var y1 = arguments[3];
-           this.p0 = new Coordinate(x0, y0);
-           this.p1 = new Coordinate(x1, y1);
-         }
-       };
+               inspector.state('select').entityIDs(ids).newFeature(newFeature);
+               inspectorWrap.call(inspector);
+             } else {
+               inspector.state('hide');
+             }
+           };
 
-       var staticAccessors$24 = { serialVersionUID: { configurable: true } };
-       LineSegment.prototype.minX = function minX () {
-         return Math.min(this.p0.x, this.p1.x)
-       };
-       LineSegment.prototype.orientationIndex = function orientationIndex () {
-         if (arguments[0] instanceof LineSegment) {
-           var seg = arguments[0];
-           var orient0 = CGAlgorithms.orientationIndex(this.p0, this.p1, seg.p0);
-           var orient1 = CGAlgorithms.orientationIndex(this.p0, this.p1, seg.p1);
-           if (orient0 >= 0 && orient1 >= 0) { return Math.max(orient0, orient1) }
-           if (orient0 <= 0 && orient1 <= 0) { return Math.max(orient0, orient1) }
-           return 0
-         } else if (arguments[0] instanceof Coordinate) {
-           var p = arguments[0];
-           return CGAlgorithms.orientationIndex(this.p0, this.p1, p)
-         }
-       };
-       LineSegment.prototype.toGeometry = function toGeometry (geomFactory) {
-         return geomFactory.createLineString([this.p0, this.p1])
-       };
-       LineSegment.prototype.isVertical = function isVertical () {
-         return this.p0.x === this.p1.x
-       };
-       LineSegment.prototype.equals = function equals (o) {
-         if (!(o instanceof LineSegment)) {
-           return false
-         }
-         var other = o;
-         return this.p0.equals(other.p0) && this.p1.equals(other.p1)
-       };
-       LineSegment.prototype.intersection = function intersection (line) {
-         var li = new RobustLineIntersector();
-         li.computeIntersection(this.p0, this.p1, line.p0, line.p1);
-         if (li.hasIntersection()) { return li.getIntersection(0) }
-         return null
-       };
-       LineSegment.prototype.project = function project () {
-         if (arguments[0] instanceof Coordinate) {
-           var p = arguments[0];
-           if (p.equals(this.p0) || p.equals(this.p1)) { return new Coordinate(p) }
-           var r = this.projectionFactor(p);
-           var coord = new Coordinate();
-           coord.x = this.p0.x + r * (this.p1.x - this.p0.x);
-           coord.y = this.p0.y + r * (this.p1.y - this.p0.y);
-           return coord
-         } else if (arguments[0] instanceof LineSegment) {
-           var seg = arguments[0];
-           var pf0 = this.projectionFactor(seg.p0);
-           var pf1 = this.projectionFactor(seg.p1);
-           if (pf0 >= 1.0 && pf1 >= 1.0) { return null }
-           if (pf0 <= 0.0 && pf1 <= 0.0) { return null }
-           var newp0 = this.project(seg.p0);
-           if (pf0 < 0.0) { newp0 = this.p0; }
-           if (pf0 > 1.0) { newp0 = this.p1; }
-           var newp1 = this.project(seg.p1);
-           if (pf1 < 0.0) { newp1 = this.p0; }
-           if (pf1 > 1.0) { newp1 = this.p1; }
-           return new LineSegment(newp0, newp1)
-         }
-       };
-       LineSegment.prototype.normalize = function normalize () {
-         if (this.p1.compareTo(this.p0) < 0) { this.reverse(); }
-       };
-       LineSegment.prototype.angle = function angle () {
-         return Math.atan2(this.p1.y - this.p0.y, this.p1.x - this.p0.x)
-       };
-       LineSegment.prototype.getCoordinate = function getCoordinate (i) {
-         if (i === 0) { return this.p0 }
-         return this.p1
-       };
-       LineSegment.prototype.distancePerpendicular = function distancePerpendicular (p) {
-         return CGAlgorithms.distancePointLinePerpendicular(p, this.p0, this.p1)
-       };
-       LineSegment.prototype.minY = function minY () {
-         return Math.min(this.p0.y, this.p1.y)
-       };
-       LineSegment.prototype.midPoint = function midPoint () {
-         return LineSegment.midPoint(this.p0, this.p1)
-       };
-       LineSegment.prototype.projectionFactor = function projectionFactor (p) {
-         if (p.equals(this.p0)) { return 0.0 }
-         if (p.equals(this.p1)) { return 1.0 }
-         var dx = this.p1.x - this.p0.x;
-         var dy = this.p1.y - this.p0.y;
-         var len = dx * dx + dy * dy;
-         if (len <= 0.0) { return Double.NaN }
-         var r = ((p.x - this.p0.x) * dx + (p.y - this.p0.y) * dy) / len;
-         return r
-       };
-       LineSegment.prototype.closestPoints = function closestPoints (line) {
-         var intPt = this.intersection(line);
-         if (intPt !== null) {
-           return [intPt, intPt]
-         }
-         var closestPt = new Array(2).fill(null);
-         var minDistance = Double.MAX_VALUE;
-         var dist = null;
-         var close00 = this.closestPoint(line.p0);
-         minDistance = close00.distance(line.p0);
-         closestPt[0] = close00;
-         closestPt[1] = line.p0;
-         var close01 = this.closestPoint(line.p1);
-         dist = close01.distance(line.p1);
-         if (dist < minDistance) {
-           minDistance = dist;
-           closestPt[0] = close01;
-           closestPt[1] = line.p1;
-         }
-         var close10 = line.closestPoint(this.p0);
-         dist = close10.distance(this.p0);
-         if (dist < minDistance) {
-           minDistance = dist;
-           closestPt[0] = this.p0;
-           closestPt[1] = close10;
-         }
-         var close11 = line.closestPoint(this.p1);
-         dist = close11.distance(this.p1);
-         if (dist < minDistance) {
-           minDistance = dist;
-           closestPt[0] = this.p1;
-           closestPt[1] = close11;
-         }
-         return closestPt
-       };
-       LineSegment.prototype.closestPoint = function closestPoint (p) {
-         var factor = this.projectionFactor(p);
-         if (factor > 0 && factor < 1) {
-           return this.project(p)
-         }
-         var dist0 = this.p0.distance(p);
-         var dist1 = this.p1.distance(p);
-         if (dist0 < dist1) { return this.p0 }
-         return this.p1
-       };
-       LineSegment.prototype.maxX = function maxX () {
-         return Math.max(this.p0.x, this.p1.x)
-       };
-       LineSegment.prototype.getLength = function getLength () {
-         return this.p0.distance(this.p1)
-       };
-       LineSegment.prototype.compareTo = function compareTo (o) {
-         var other = o;
-         var comp0 = this.p0.compareTo(other.p0);
-         if (comp0 !== 0) { return comp0 }
-         return this.p1.compareTo(other.p1)
-       };
-       LineSegment.prototype.reverse = function reverse () {
-         var temp = this.p0;
-         this.p0 = this.p1;
-         this.p1 = temp;
-       };
-       LineSegment.prototype.equalsTopo = function equalsTopo (other) {
-         return this.p0.equals(other.p0) &&
-               (this.p1.equals(other.p1) || this.p0.equals(other.p1)) &&
-                this.p1.equals(other.p0)
-       };
-       LineSegment.prototype.lineIntersection = function lineIntersection (line) {
-         try {
-           var intPt = HCoordinate.intersection(this.p0, this.p1, line.p0, line.p1);
-           return intPt
-         } catch (ex) {
-           if (ex instanceof NotRepresentableException) ; else { throw ex }
-         } finally {}
-         return null
-       };
-       LineSegment.prototype.maxY = function maxY () {
-         return Math.max(this.p0.y, this.p1.y)
-       };
-       LineSegment.prototype.pointAlongOffset = function pointAlongOffset (segmentLengthFraction, offsetDistance) {
-         var segx = this.p0.x + segmentLengthFraction * (this.p1.x - this.p0.x);
-         var segy = this.p0.y + segmentLengthFraction * (this.p1.y - this.p0.y);
-         var dx = this.p1.x - this.p0.x;
-         var dy = this.p1.y - this.p0.y;
-         var len = Math.sqrt(dx * dx + dy * dy);
-         var ux = 0.0;
-         var uy = 0.0;
-         if (offsetDistance !== 0.0) {
-           if (len <= 0.0) { throw new Error('Cannot compute offset from zero-length line segment') }
-           ux = offsetDistance * dx / len;
-           uy = offsetDistance * dy / len;
-         }
-         var offsetx = segx - uy;
-         var offsety = segy + ux;
-         var coord = new Coordinate(offsetx, offsety);
-         return coord
-       };
-       LineSegment.prototype.setCoordinates = function setCoordinates () {
-         if (arguments.length === 1) {
-           var ls = arguments[0];
-           this.setCoordinates(ls.p0, ls.p1);
-         } else if (arguments.length === 2) {
-           var p0 = arguments[0];
-           var p1 = arguments[1];
-           this.p0.x = p0.x;
-           this.p0.y = p0.y;
-           this.p1.x = p1.x;
-           this.p1.y = p1.y;
-         }
-       };
-       LineSegment.prototype.segmentFraction = function segmentFraction (inputPt) {
-         var segFrac = this.projectionFactor(inputPt);
-         if (segFrac < 0.0) { segFrac = 0.0; } else if (segFrac > 1.0 || Double.isNaN(segFrac)) { segFrac = 1.0; }
-         return segFrac
-       };
-       LineSegment.prototype.toString = function toString () {
-         return 'LINESTRING( ' + this.p0.x + ' ' + this.p0.y + ', ' + this.p1.x + ' ' + this.p1.y + ')'
-       };
-       LineSegment.prototype.isHorizontal = function isHorizontal () {
-         return this.p0.y === this.p1.y
-       };
-       LineSegment.prototype.distance = function distance () {
-         if (arguments[0] instanceof LineSegment) {
-           var ls = arguments[0];
-           return CGAlgorithms.distanceLineLine(this.p0, this.p1, ls.p0, ls.p1)
-         } else if (arguments[0] instanceof Coordinate) {
-           var p = arguments[0];
-           return CGAlgorithms.distancePointLine(p, this.p0, this.p1)
-         }
-       };
-       LineSegment.prototype.pointAlong = function pointAlong (segmentLengthFraction) {
-         var coord = new Coordinate();
-         coord.x = this.p0.x + segmentLengthFraction * (this.p1.x - this.p0.x);
-         coord.y = this.p0.y + segmentLengthFraction * (this.p1.y - this.p0.y);
-         return coord
-       };
-       LineSegment.prototype.hashCode = function hashCode () {
-         var bits0 = Double.doubleToLongBits(this.p0.x);
-         bits0 ^= Double.doubleToLongBits(this.p0.y) * 31;
-         var hash0 = Math.trunc(bits0) ^ Math.trunc(bits0 >> 32);
-         var bits1 = Double.doubleToLongBits(this.p1.x);
-         bits1 ^= Double.doubleToLongBits(this.p1.y) * 31;
-         var hash1 = Math.trunc(bits1) ^ Math.trunc(bits1 >> 32);
-         return hash0 ^ hash1
-       };
-       LineSegment.prototype.interfaces_ = function interfaces_ () {
-         return [Comparable, Serializable]
-       };
-       LineSegment.prototype.getClass = function getClass () {
-         return LineSegment
-       };
-       LineSegment.midPoint = function midPoint (p0, p1) {
-         return new Coordinate((p0.x + p1.x) / 2, (p0.y + p1.y) / 2)
-       };
-       staticAccessors$24.serialVersionUID.get = function () { return 3252005833466256227 };
+           sidebar.showPresetList = function () {
+             inspector.showList();
+           };
 
-       Object.defineProperties( LineSegment, staticAccessors$24 );
+           sidebar.show = function (component, element) {
+             featureListWrap.classed('inspector-hidden', true);
+             inspectorWrap.classed('inspector-hidden', true);
+             if (_current) _current.remove();
+             _current = selection.append('div').attr('class', 'sidebar-component').call(component, element);
+           };
 
-       var MonotoneChainOverlapAction = function MonotoneChainOverlapAction () {
-         this.tempEnv1 = new Envelope();
-         this.tempEnv2 = new Envelope();
-         this._overlapSeg1 = new LineSegment();
-         this._overlapSeg2 = new LineSegment();
-       };
-       MonotoneChainOverlapAction.prototype.overlap = function overlap () {
-         if (arguments.length === 2) ; else if (arguments.length === 4) {
-           var mc1 = arguments[0];
-           var start1 = arguments[1];
-           var mc2 = arguments[2];
-           var start2 = arguments[3];
-           mc1.getLineSegment(start1, this._overlapSeg1);
-           mc2.getLineSegment(start2, this._overlapSeg2);
-           this.overlap(this._overlapSeg1, this._overlapSeg2);
-         }
-       };
-       MonotoneChainOverlapAction.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       MonotoneChainOverlapAction.prototype.getClass = function getClass () {
-         return MonotoneChainOverlapAction
-       };
+           sidebar.hide = function () {
+             featureListWrap.classed('inspector-hidden', false);
+             inspectorWrap.classed('inspector-hidden', true);
+             if (_current) _current.remove();
+             _current = null;
+           };
 
-       var MonotoneChain = function MonotoneChain () {
-         this._pts = null;
-         this._start = null;
-         this._end = null;
-         this._env = null;
-         this._context = null;
-         this._id = null;
-         var pts = arguments[0];
-         var start = arguments[1];
-         var end = arguments[2];
-         var context = arguments[3];
-         this._pts = pts;
-         this._start = start;
-         this._end = end;
-         this._context = context;
-       };
-       MonotoneChain.prototype.getLineSegment = function getLineSegment (index, ls) {
-         ls.p0 = this._pts[index];
-         ls.p1 = this._pts[index + 1];
-       };
-       MonotoneChain.prototype.computeSelect = function computeSelect (searchEnv, start0, end0, mcs) {
-         var p0 = this._pts[start0];
-         var p1 = this._pts[end0];
-         mcs.tempEnv1.init(p0, p1);
-         if (end0 - start0 === 1) {
-           mcs.select(this, start0);
-           return null
-         }
-         if (!searchEnv.intersects(mcs.tempEnv1)) { return null }
-         var mid = Math.trunc((start0 + end0) / 2);
-         if (start0 < mid) {
-           this.computeSelect(searchEnv, start0, mid, mcs);
-         }
-         if (mid < end0) {
-           this.computeSelect(searchEnv, mid, end0, mcs);
-         }
-       };
-       MonotoneChain.prototype.getCoordinates = function getCoordinates () {
-           var this$1 = this;
+           sidebar.expand = function (moveMap) {
+             if (selection.classed('collapsed')) {
+               sidebar.toggle(moveMap);
+             }
+           };
 
-         var coord = new Array(this._end - this._start + 1).fill(null);
-         var index = 0;
-         for (var i = this._start; i <= this._end; i++) {
-           coord[index++] = this$1._pts[i];
-         }
-         return coord
-       };
-       MonotoneChain.prototype.computeOverlaps = function computeOverlaps (mc, mco) {
-         this.computeOverlapsInternal(this._start, this._end, mc, mc._start, mc._end, mco);
-       };
-       MonotoneChain.prototype.setId = function setId (id) {
-         this._id = id;
-       };
-       MonotoneChain.prototype.select = function select (searchEnv, mcs) {
-         this.computeSelect(searchEnv, this._start, this._end, mcs);
-       };
-       MonotoneChain.prototype.getEnvelope = function getEnvelope () {
-         if (this._env === null) {
-           var p0 = this._pts[this._start];
-           var p1 = this._pts[this._end];
-           this._env = new Envelope(p0, p1);
-         }
-         return this._env
-       };
-       MonotoneChain.prototype.getEndIndex = function getEndIndex () {
-         return this._end
-       };
-       MonotoneChain.prototype.getStartIndex = function getStartIndex () {
-         return this._start
-       };
-       MonotoneChain.prototype.getContext = function getContext () {
-         return this._context
-       };
-       MonotoneChain.prototype.getId = function getId () {
-         return this._id
-       };
-       MonotoneChain.prototype.computeOverlapsInternal = function computeOverlapsInternal (start0, end0, mc, start1, end1, mco) {
-         var p00 = this._pts[start0];
-         var p01 = this._pts[end0];
-         var p10 = mc._pts[start1];
-         var p11 = mc._pts[end1];
-         if (end0 - start0 === 1 && end1 - start1 === 1) {
-           mco.overlap(this, start0, mc, start1);
-           return null
-         }
-         mco.tempEnv1.init(p00, p01);
-         mco.tempEnv2.init(p10, p11);
-         if (!mco.tempEnv1.intersects(mco.tempEnv2)) { return null }
-         var mid0 = Math.trunc((start0 + end0) / 2);
-         var mid1 = Math.trunc((start1 + end1) / 2);
-         if (start0 < mid0) {
-           if (start1 < mid1) { this.computeOverlapsInternal(start0, mid0, mc, start1, mid1, mco); }
-           if (mid1 < end1) { this.computeOverlapsInternal(start0, mid0, mc, mid1, end1, mco); }
-         }
-         if (mid0 < end0) {
-           if (start1 < mid1) { this.computeOverlapsInternal(mid0, end0, mc, start1, mid1, mco); }
-           if (mid1 < end1) { this.computeOverlapsInternal(mid0, end0, mc, mid1, end1, mco); }
-         }
-       };
-       MonotoneChain.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       MonotoneChain.prototype.getClass = function getClass () {
-         return MonotoneChain
-       };
+           sidebar.collapse = function (moveMap) {
+             if (!selection.classed('collapsed')) {
+               sidebar.toggle(moveMap);
+             }
+           };
 
-       var MonotoneChainBuilder = function MonotoneChainBuilder () {};
+           sidebar.toggle = function (moveMap) {
+             // Don't allow sidebar to toggle when the user is in the walkthrough.
+             if (context.inIntro()) return;
+             var isCollapsed = selection.classed('collapsed');
+             var isCollapsing = !isCollapsed;
+             var isRTL = _mainLocalizer.textDirection() === 'rtl';
+             var scaleX = isRTL ? 0 : 1;
+             var xMarginProperty = isRTL ? 'margin-right' : 'margin-left';
+             sidebarWidth = selection.node().getBoundingClientRect().width; // switch from % to px
 
-       MonotoneChainBuilder.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       MonotoneChainBuilder.prototype.getClass = function getClass () {
-         return MonotoneChainBuilder
-       };
-       MonotoneChainBuilder.getChainStartIndices = function getChainStartIndices (pts) {
-         var start = 0;
-         var startIndexList = new ArrayList();
-         startIndexList.add(new Integer(start));
-         do {
-           var last = MonotoneChainBuilder.findChainEnd(pts, start);
-           startIndexList.add(new Integer(last));
-           start = last;
-         } while (start < pts.length - 1)
-         var startIndex = MonotoneChainBuilder.toIntArray(startIndexList);
-         return startIndex
-       };
-       MonotoneChainBuilder.findChainEnd = function findChainEnd (pts, start) {
-         var safeStart = start;
-         while (safeStart < pts.length - 1 && pts[safeStart].equals2D(pts[safeStart + 1])) {
-           safeStart++;
-         }
-         if (safeStart >= pts.length - 1) {
-           return pts.length - 1
-         }
-         var chainQuad = Quadrant.quadrant(pts[safeStart], pts[safeStart + 1]);
-         var last = start + 1;
-         while (last < pts.length) {
-           if (!pts[last - 1].equals2D(pts[last])) {
-             var quad = Quadrant.quadrant(pts[last - 1], pts[last]);
-             if (quad !== chainQuad) { break }
-           }
-           last++;
-         }
-         return last - 1
-       };
-       MonotoneChainBuilder.getChains = function getChains () {
-         if (arguments.length === 1) {
-           var pts = arguments[0];
-           return MonotoneChainBuilder.getChains(pts, null)
-         } else if (arguments.length === 2) {
-           var pts$1 = arguments[0];
-           var context = arguments[1];
-           var mcList = new ArrayList();
-           var startIndex = MonotoneChainBuilder.getChainStartIndices(pts$1);
-           for (var i = 0; i < startIndex.length - 1; i++) {
-             var mc = new MonotoneChain(pts$1, startIndex[i], startIndex[i + 1], context);
-             mcList.add(mc);
-           }
-           return mcList
-         }
-       };
-       MonotoneChainBuilder.toIntArray = function toIntArray (list) {
-         var array = new Array(list.size()).fill(null);
-         for (var i = 0; i < array.length; i++) {
-           array[i] = list.get(i).intValue();
-         }
-         return array
-       };
+             selection.style('width', sidebarWidth + 'px');
+             var startMargin, endMargin, lastMargin;
 
-       var Noder = function Noder () {};
+             if (isCollapsing) {
+               startMargin = lastMargin = 0;
+               endMargin = -sidebarWidth;
+             } else {
+               startMargin = lastMargin = -sidebarWidth;
+               endMargin = 0;
+             }
 
-       Noder.prototype.computeNodes = function computeNodes (segStrings) {};
-       Noder.prototype.getNodedSubstrings = function getNodedSubstrings () {};
-       Noder.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       Noder.prototype.getClass = function getClass () {
-         return Noder
-       };
+             if (!isCollapsing) {
+               // unhide the sidebar's content before it transitions onscreen
+               selection.classed('collapsed', isCollapsing);
+             }
 
-       var SinglePassNoder = function SinglePassNoder () {
-         this._segInt = null;
-         if (arguments.length === 0) ; else if (arguments.length === 1) {
-           var segInt = arguments[0];
-           this.setSegmentIntersector(segInt);
-         }
-       };
-       SinglePassNoder.prototype.setSegmentIntersector = function setSegmentIntersector (segInt) {
-         this._segInt = segInt;
-       };
-       SinglePassNoder.prototype.interfaces_ = function interfaces_ () {
-         return [Noder]
-       };
-       SinglePassNoder.prototype.getClass = function getClass () {
-         return SinglePassNoder
-       };
+             selection.transition().style(xMarginProperty, endMargin + 'px').tween('panner', function () {
+               var i = d3_interpolateNumber(startMargin, endMargin);
+               return function (t) {
+                 var dx = lastMargin - Math.round(i(t));
+                 lastMargin = lastMargin - dx;
+                 context.ui().onResize(moveMap ? undefined : [dx * scaleX, 0]);
+               };
+             }).on('end', function () {
+               if (isCollapsing) {
+                 // hide the sidebar's content after it transitions offscreen
+                 selection.classed('collapsed', isCollapsing);
+               } // switch back from px to %
 
-       var MCIndexNoder = (function (SinglePassNoder$$1) {
-         function MCIndexNoder (si) {
-           if (si) { SinglePassNoder$$1.call(this, si); }
-           else { SinglePassNoder$$1.call(this); }
-           this._monoChains = new ArrayList();
-           this._index = new STRtree();
-           this._idCounter = 0;
-           this._nodedSegStrings = null;
-           this._nOverlaps = 0;
-         }
 
-         if ( SinglePassNoder$$1 ) MCIndexNoder.__proto__ = SinglePassNoder$$1;
-         MCIndexNoder.prototype = Object.create( SinglePassNoder$$1 && SinglePassNoder$$1.prototype );
-         MCIndexNoder.prototype.constructor = MCIndexNoder;
+               if (!isCollapsing) {
+                 var containerWidth = container.node().getBoundingClientRect().width;
+                 var widthPct = sidebarWidth / containerWidth * 100;
+                 selection.style(xMarginProperty, null).style('width', widthPct + '%');
+               }
+             });
+           }; // toggle the sidebar collapse when double-clicking the resizer
 
-         var staticAccessors = { SegmentOverlapAction: { configurable: true } };
-         MCIndexNoder.prototype.getMonotoneChains = function getMonotoneChains () {
-           return this._monoChains
-         };
-         MCIndexNoder.prototype.getNodedSubstrings = function getNodedSubstrings () {
-           return NodedSegmentString.getNodedSubstrings(this._nodedSegStrings)
-         };
-         MCIndexNoder.prototype.getIndex = function getIndex () {
-           return this._index
-         };
-         MCIndexNoder.prototype.add = function add (segStr) {
-           var this$1 = this;
-
-           var segChains = MonotoneChainBuilder.getChains(segStr.getCoordinates(), segStr);
-           for (var i = segChains.iterator(); i.hasNext();) {
-             var mc = i.next();
-             mc.setId(this$1._idCounter++);
-             this$1._index.insert(mc.getEnvelope(), mc);
-             this$1._monoChains.add(mc);
-           }
-         };
-         MCIndexNoder.prototype.computeNodes = function computeNodes (inputSegStrings) {
-           var this$1 = this;
-
-           this._nodedSegStrings = inputSegStrings;
-           for (var i = inputSegStrings.iterator(); i.hasNext();) {
-             this$1.add(i.next());
-           }
-           this.intersectChains();
-         };
-         MCIndexNoder.prototype.intersectChains = function intersectChains () {
-           var this$1 = this;
-
-           var overlapAction = new SegmentOverlapAction(this._segInt);
-           for (var i = this._monoChains.iterator(); i.hasNext();) {
-             var queryChain = i.next();
-             var overlapChains = this$1._index.query(queryChain.getEnvelope());
-             for (var j = overlapChains.iterator(); j.hasNext();) {
-               var testChain = j.next();
-               if (testChain.getId() > queryChain.getId()) {
-                 queryChain.computeOverlaps(testChain, overlapAction);
-                 this$1._nOverlaps++;
-               }
-               if (this$1._segInt.isDone()) { return null }
-             }
-           }
-         };
-         MCIndexNoder.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         MCIndexNoder.prototype.getClass = function getClass () {
-           return MCIndexNoder
-         };
-         staticAccessors.SegmentOverlapAction.get = function () { return SegmentOverlapAction };
-
-         Object.defineProperties( MCIndexNoder, staticAccessors );
-
-         return MCIndexNoder;
-       }(SinglePassNoder));
-
-       var SegmentOverlapAction = (function (MonotoneChainOverlapAction$$1) {
-         function SegmentOverlapAction () {
-           MonotoneChainOverlapAction$$1.call(this);
-           this._si = null;
-           var si = arguments[0];
-           this._si = si;
-         }
-
-         if ( MonotoneChainOverlapAction$$1 ) SegmentOverlapAction.__proto__ = MonotoneChainOverlapAction$$1;
-         SegmentOverlapAction.prototype = Object.create( MonotoneChainOverlapAction$$1 && MonotoneChainOverlapAction$$1.prototype );
-         SegmentOverlapAction.prototype.constructor = SegmentOverlapAction;
-         SegmentOverlapAction.prototype.overlap = function overlap () {
-           if (arguments.length === 4) {
-             var mc1 = arguments[0];
-             var start1 = arguments[1];
-             var mc2 = arguments[2];
-             var start2 = arguments[3];
-             var ss1 = mc1.getContext();
-             var ss2 = mc2.getContext();
-             this._si.processIntersections(ss1, start1, ss2, start2);
-           } else { return MonotoneChainOverlapAction$$1.prototype.overlap.apply(this, arguments) }
-         };
-         SegmentOverlapAction.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         SegmentOverlapAction.prototype.getClass = function getClass () {
-           return SegmentOverlapAction
-         };
-
-         return SegmentOverlapAction;
-       }(MonotoneChainOverlapAction));
 
-       var BufferParameters = function BufferParameters () {
-         this._quadrantSegments = BufferParameters.DEFAULT_QUADRANT_SEGMENTS;
-         this._endCapStyle = BufferParameters.CAP_ROUND;
-         this._joinStyle = BufferParameters.JOIN_ROUND;
-         this._mitreLimit = BufferParameters.DEFAULT_MITRE_LIMIT;
-         this._isSingleSided = false;
-         this._simplifyFactor = BufferParameters.DEFAULT_SIMPLIFY_FACTOR;
+           resizer.on('dblclick', function (d3_event) {
+             d3_event.preventDefault();
 
-         if (arguments.length === 0) ; else if (arguments.length === 1) {
-           var quadrantSegments = arguments[0];
-           this.setQuadrantSegments(quadrantSegments);
-         } else if (arguments.length === 2) {
-           var quadrantSegments$1 = arguments[0];
-           var endCapStyle = arguments[1];
-           this.setQuadrantSegments(quadrantSegments$1);
-           this.setEndCapStyle(endCapStyle);
-         } else if (arguments.length === 4) {
-           var quadrantSegments$2 = arguments[0];
-           var endCapStyle$1 = arguments[1];
-           var joinStyle = arguments[2];
-           var mitreLimit = arguments[3];
-           this.setQuadrantSegments(quadrantSegments$2);
-           this.setEndCapStyle(endCapStyle$1);
-           this.setJoinStyle(joinStyle);
-           this.setMitreLimit(mitreLimit);
-         }
-       };
+             if (d3_event.sourceEvent) {
+               d3_event.sourceEvent.preventDefault();
+             }
 
-       var staticAccessors$25 = { CAP_ROUND: { configurable: true },CAP_FLAT: { configurable: true },CAP_SQUARE: { configurable: true },JOIN_ROUND: { configurable: true },JOIN_MITRE: { configurable: true },JOIN_BEVEL: { configurable: true },DEFAULT_QUADRANT_SEGMENTS: { configurable: true },DEFAULT_MITRE_LIMIT: { configurable: true },DEFAULT_SIMPLIFY_FACTOR: { configurable: true } };
-       BufferParameters.prototype.getEndCapStyle = function getEndCapStyle () {
-         return this._endCapStyle
-       };
-       BufferParameters.prototype.isSingleSided = function isSingleSided () {
-         return this._isSingleSided
-       };
-       BufferParameters.prototype.setQuadrantSegments = function setQuadrantSegments (quadSegs) {
-         this._quadrantSegments = quadSegs;
-         if (this._quadrantSegments === 0) { this._joinStyle = BufferParameters.JOIN_BEVEL; }
-         if (this._quadrantSegments < 0) {
-           this._joinStyle = BufferParameters.JOIN_MITRE;
-           this._mitreLimit = Math.abs(this._quadrantSegments);
-         }
-         if (quadSegs <= 0) {
-           this._quadrantSegments = 1;
-         }
-         if (this._joinStyle !== BufferParameters.JOIN_ROUND) {
-           this._quadrantSegments = BufferParameters.DEFAULT_QUADRANT_SEGMENTS;
+             sidebar.toggle();
+           }); // ensure hover sidebar is closed when zooming out beyond editable zoom
+
+           context.map().on('crossEditableZoom.sidebar', function (within) {
+             if (!within && !selection.select('.inspector-hover').empty()) {
+               hover([]);
+             }
+           });
          }
-       };
-       BufferParameters.prototype.getJoinStyle = function getJoinStyle () {
-         return this._joinStyle
-       };
-       BufferParameters.prototype.setJoinStyle = function setJoinStyle (joinStyle) {
-         this._joinStyle = joinStyle;
-       };
-       BufferParameters.prototype.setSimplifyFactor = function setSimplifyFactor (simplifyFactor) {
-         this._simplifyFactor = simplifyFactor < 0 ? 0 : simplifyFactor;
-       };
-       BufferParameters.prototype.getSimplifyFactor = function getSimplifyFactor () {
-         return this._simplifyFactor
-       };
-       BufferParameters.prototype.getQuadrantSegments = function getQuadrantSegments () {
-         return this._quadrantSegments
-       };
-       BufferParameters.prototype.setEndCapStyle = function setEndCapStyle (endCapStyle) {
-         this._endCapStyle = endCapStyle;
-       };
-       BufferParameters.prototype.getMitreLimit = function getMitreLimit () {
-         return this._mitreLimit
-       };
-       BufferParameters.prototype.setMitreLimit = function setMitreLimit (mitreLimit) {
-         this._mitreLimit = mitreLimit;
-       };
-       BufferParameters.prototype.setSingleSided = function setSingleSided (isSingleSided) {
-         this._isSingleSided = isSingleSided;
-       };
-       BufferParameters.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       BufferParameters.prototype.getClass = function getClass () {
-         return BufferParameters
-       };
-       BufferParameters.bufferDistanceError = function bufferDistanceError (quadSegs) {
-         var alpha = Math.PI / 2.0 / quadSegs;
-         return 1 - Math.cos(alpha / 2.0)
-       };
-       staticAccessors$25.CAP_ROUND.get = function () { return 1 };
-       staticAccessors$25.CAP_FLAT.get = function () { return 2 };
-       staticAccessors$25.CAP_SQUARE.get = function () { return 3 };
-       staticAccessors$25.JOIN_ROUND.get = function () { return 1 };
-       staticAccessors$25.JOIN_MITRE.get = function () { return 2 };
-       staticAccessors$25.JOIN_BEVEL.get = function () { return 3 };
-       staticAccessors$25.DEFAULT_QUADRANT_SEGMENTS.get = function () { return 8 };
-       staticAccessors$25.DEFAULT_MITRE_LIMIT.get = function () { return 5.0 };
-       staticAccessors$25.DEFAULT_SIMPLIFY_FACTOR.get = function () { return 0.01 };
-
-       Object.defineProperties( BufferParameters, staticAccessors$25 );
-
-       var BufferInputLineSimplifier = function BufferInputLineSimplifier (inputLine) {
-         this._distanceTol = null;
-         this._isDeleted = null;
-         this._angleOrientation = CGAlgorithms.COUNTERCLOCKWISE;
-         this._inputLine = inputLine || null;
-       };
 
-       var staticAccessors$26 = { INIT: { configurable: true },DELETE: { configurable: true },KEEP: { configurable: true },NUM_PTS_TO_CHECK: { configurable: true } };
-       BufferInputLineSimplifier.prototype.isDeletable = function isDeletable (i0, i1, i2, distanceTol) {
-         var p0 = this._inputLine[i0];
-         var p1 = this._inputLine[i1];
-         var p2 = this._inputLine[i2];
-         if (!this.isConcave(p0, p1, p2)) { return false }
-         if (!this.isShallow(p0, p1, p2, distanceTol)) { return false }
-         return this.isShallowSampled(p0, p1, i0, i2, distanceTol)
-       };
-       BufferInputLineSimplifier.prototype.deleteShallowConcavities = function deleteShallowConcavities () {
-           var this$1 = this;
+         sidebar.showPresetList = function () {};
 
-         var index = 1;
-         // const maxIndex = this._inputLine.length - 1
-         var midIndex = this.findNextNonDeletedIndex(index);
-         var lastIndex = this.findNextNonDeletedIndex(midIndex);
-         var isChanged = false;
-         while (lastIndex < this._inputLine.length) {
-           var isMiddleVertexDeleted = false;
-           if (this$1.isDeletable(index, midIndex, lastIndex, this$1._distanceTol)) {
-             this$1._isDeleted[midIndex] = BufferInputLineSimplifier.DELETE;
-             isMiddleVertexDeleted = true;
-             isChanged = true;
-           }
-           if (isMiddleVertexDeleted) { index = lastIndex; } else { index = midIndex; }
-           midIndex = this$1.findNextNonDeletedIndex(index);
-           lastIndex = this$1.findNextNonDeletedIndex(midIndex);
-         }
-         return isChanged
-       };
-       BufferInputLineSimplifier.prototype.isShallowConcavity = function isShallowConcavity (p0, p1, p2, distanceTol) {
-         var orientation = CGAlgorithms.computeOrientation(p0, p1, p2);
-         var isAngleToSimplify = orientation === this._angleOrientation;
-         if (!isAngleToSimplify) { return false }
-         var dist = CGAlgorithms.distancePointLine(p1, p0, p2);
-         return dist < distanceTol
-       };
-       BufferInputLineSimplifier.prototype.isShallowSampled = function isShallowSampled (p0, p2, i0, i2, distanceTol) {
-           var this$1 = this;
+         sidebar.hover = function () {};
 
-         var inc = Math.trunc((i2 - i0) / BufferInputLineSimplifier.NUM_PTS_TO_CHECK);
-         if (inc <= 0) { inc = 1; }
-         for (var i = i0; i < i2; i += inc) {
-           if (!this$1.isShallow(p0, p2, this$1._inputLine[i], distanceTol)) { return false }
-         }
-         return true
-       };
-       BufferInputLineSimplifier.prototype.isConcave = function isConcave (p0, p1, p2) {
-         var orientation = CGAlgorithms.computeOrientation(p0, p1, p2);
-         var isConcave = orientation === this._angleOrientation;
-         return isConcave
-       };
-       BufferInputLineSimplifier.prototype.simplify = function simplify (distanceTol) {
-           var this$1 = this;
+         sidebar.hover.cancel = function () {};
 
-         this._distanceTol = Math.abs(distanceTol);
-         if (distanceTol < 0) { this._angleOrientation = CGAlgorithms.CLOCKWISE; }
-         this._isDeleted = new Array(this._inputLine.length).fill(null);
-         var isChanged = false;
-         do {
-           isChanged = this$1.deleteShallowConcavities();
-         } while (isChanged)
-         return this.collapseLine()
-       };
-       BufferInputLineSimplifier.prototype.findNextNonDeletedIndex = function findNextNonDeletedIndex (index) {
-         var next = index + 1;
-         while (next < this._inputLine.length && this._isDeleted[next] === BufferInputLineSimplifier.DELETE) { next++; }
-         return next
-       };
-       BufferInputLineSimplifier.prototype.isShallow = function isShallow (p0, p1, p2, distanceTol) {
-         var dist = CGAlgorithms.distancePointLine(p1, p0, p2);
-         return dist < distanceTol
-       };
-       BufferInputLineSimplifier.prototype.collapseLine = function collapseLine () {
-           var this$1 = this;
+         sidebar.intersects = function () {};
 
-         var coordList = new CoordinateList();
-         for (var i = 0; i < this._inputLine.length; i++) {
-           if (this$1._isDeleted[i] !== BufferInputLineSimplifier.DELETE) { coordList.add(this$1._inputLine[i]); }
-         }
-         return coordList.toCoordinateArray()
-       };
-       BufferInputLineSimplifier.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       BufferInputLineSimplifier.prototype.getClass = function getClass () {
-         return BufferInputLineSimplifier
-       };
-       BufferInputLineSimplifier.simplify = function simplify (inputLine, distanceTol) {
-         var simp = new BufferInputLineSimplifier(inputLine);
-         return simp.simplify(distanceTol)
-       };
-       staticAccessors$26.INIT.get = function () { return 0 };
-       staticAccessors$26.DELETE.get = function () { return 1 };
-       staticAccessors$26.KEEP.get = function () { return 1 };
-       staticAccessors$26.NUM_PTS_TO_CHECK.get = function () { return 10 };
-
-       Object.defineProperties( BufferInputLineSimplifier, staticAccessors$26 );
-
-       var OffsetSegmentString = function OffsetSegmentString () {
-         this._ptList = null;
-         this._precisionModel = null;
-         this._minimimVertexDistance = 0.0;
-         this._ptList = new ArrayList();
-       };
+         sidebar.select = function () {};
 
-       var staticAccessors$28 = { COORDINATE_ARRAY_TYPE: { configurable: true } };
-       OffsetSegmentString.prototype.getCoordinates = function getCoordinates () {
-         var coord = this._ptList.toArray(OffsetSegmentString.COORDINATE_ARRAY_TYPE);
-         return coord
-       };
-       OffsetSegmentString.prototype.setPrecisionModel = function setPrecisionModel (precisionModel) {
-         this._precisionModel = precisionModel;
-       };
-       OffsetSegmentString.prototype.addPt = function addPt (pt) {
-         var bufPt = new Coordinate(pt);
-         this._precisionModel.makePrecise(bufPt);
-         if (this.isRedundant(bufPt)) { return null }
-         this._ptList.add(bufPt);
-       };
-       OffsetSegmentString.prototype.revere = function revere () {};
-       OffsetSegmentString.prototype.addPts = function addPts (pt, isForward) {
-           var this$1 = this;
+         sidebar.show = function () {};
 
-         if (isForward) {
-           for (var i = 0; i < pt.length; i++) {
-             this$1.addPt(pt[i]);
-           }
-         } else {
-           for (var i$1 = pt.length - 1; i$1 >= 0; i$1--) {
-             this$1.addPt(pt[i$1]);
-           }
-         }
-       };
-       OffsetSegmentString.prototype.isRedundant = function isRedundant (pt) {
-         if (this._ptList.size() < 1) { return false }
-         var lastPt = this._ptList.get(this._ptList.size() - 1);
-         var ptDist = pt.distance(lastPt);
-         if (ptDist < this._minimimVertexDistance) { return true }
-         return false
-       };
-       OffsetSegmentString.prototype.toString = function toString () {
-         var fact = new GeometryFactory();
-         var line = fact.createLineString(this.getCoordinates());
-         return line.toString()
-       };
-       OffsetSegmentString.prototype.closeRing = function closeRing () {
-         if (this._ptList.size() < 1) { return null }
-         var startPt = new Coordinate(this._ptList.get(0));
-         var lastPt = this._ptList.get(this._ptList.size() - 1);
-         // const last2Pt = null
-         // if (this._ptList.size() >= 2) last2Pt = this._ptList.get(this._ptList.size() - 2)
-         if (startPt.equals(lastPt)) { return null }
-         this._ptList.add(startPt);
-       };
-       OffsetSegmentString.prototype.setMinimumVertexDistance = function setMinimumVertexDistance (minimimVertexDistance) {
-         this._minimimVertexDistance = minimimVertexDistance;
-       };
-       OffsetSegmentString.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       OffsetSegmentString.prototype.getClass = function getClass () {
-         return OffsetSegmentString
-       };
-       staticAccessors$28.COORDINATE_ARRAY_TYPE.get = function () { return new Array(0).fill(null) };
+         sidebar.hide = function () {};
 
-       Object.defineProperties( OffsetSegmentString, staticAccessors$28 );
+         sidebar.expand = function () {};
 
-       var Angle = function Angle () {};
+         sidebar.collapse = function () {};
 
-       var staticAccessors$29 = { PI_TIMES_2: { configurable: true },PI_OVER_2: { configurable: true },PI_OVER_4: { configurable: true },COUNTERCLOCKWISE: { configurable: true },CLOCKWISE: { configurable: true },NONE: { configurable: true } };
+         sidebar.toggle = function () {};
 
-       Angle.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       Angle.prototype.getClass = function getClass () {
-         return Angle
-       };
-       Angle.toDegrees = function toDegrees (radians) {
-         return radians * 180 / Math.PI
-       };
-       Angle.normalize = function normalize (angle) {
-         while (angle > Math.PI) { angle -= Angle.PI_TIMES_2; }
-         while (angle <= -Math.PI) { angle += Angle.PI_TIMES_2; }
-         return angle
-       };
-       Angle.angle = function angle () {
-         if (arguments.length === 1) {
-           var p = arguments[0];
-           return Math.atan2(p.y, p.x)
-         } else if (arguments.length === 2) {
-           var p0 = arguments[0];
-           var p1 = arguments[1];
-           var dx = p1.x - p0.x;
-           var dy = p1.y - p0.y;
-           return Math.atan2(dy, dx)
-         }
-       };
-       Angle.isAcute = function isAcute (p0, p1, p2) {
-         var dx0 = p0.x - p1.x;
-         var dy0 = p0.y - p1.y;
-         var dx1 = p2.x - p1.x;
-         var dy1 = p2.y - p1.y;
-         var dotprod = dx0 * dx1 + dy0 * dy1;
-         return dotprod > 0
-       };
-       Angle.isObtuse = function isObtuse (p0, p1, p2) {
-         var dx0 = p0.x - p1.x;
-         var dy0 = p0.y - p1.y;
-         var dx1 = p2.x - p1.x;
-         var dy1 = p2.y - p1.y;
-         var dotprod = dx0 * dx1 + dy0 * dy1;
-         return dotprod < 0
-       };
-       Angle.interiorAngle = function interiorAngle (p0, p1, p2) {
-         var anglePrev = Angle.angle(p1, p0);
-         var angleNext = Angle.angle(p1, p2);
-         return Math.abs(angleNext - anglePrev)
-       };
-       Angle.normalizePositive = function normalizePositive (angle) {
-         if (angle < 0.0) {
-           while (angle < 0.0) { angle += Angle.PI_TIMES_2; }
-           if (angle >= Angle.PI_TIMES_2) { angle = 0.0; }
-         } else {
-           while (angle >= Angle.PI_TIMES_2) { angle -= Angle.PI_TIMES_2; }
-           if (angle < 0.0) { angle = 0.0; }
-         }
-         return angle
-       };
-       Angle.angleBetween = function angleBetween (tip1, tail, tip2) {
-         var a1 = Angle.angle(tail, tip1);
-         var a2 = Angle.angle(tail, tip2);
-         return Angle.diff(a1, a2)
-       };
-       Angle.diff = function diff (ang1, ang2) {
-         var delAngle = null;
-         if (ang1 < ang2) {
-           delAngle = ang2 - ang1;
-         } else {
-           delAngle = ang1 - ang2;
-         }
-         if (delAngle > Math.PI) {
-           delAngle = 2 * Math.PI - delAngle;
-         }
-         return delAngle
-       };
-       Angle.toRadians = function toRadians (angleDegrees) {
-         return angleDegrees * Math.PI / 180.0
-       };
-       Angle.getTurn = function getTurn (ang1, ang2) {
-         var crossproduct = Math.sin(ang2 - ang1);
-         if (crossproduct > 0) {
-           return Angle.COUNTERCLOCKWISE
-         }
-         if (crossproduct < 0) {
-           return Angle.CLOCKWISE
-         }
-         return Angle.NONE
-       };
-       Angle.angleBetweenOriented = function angleBetweenOriented (tip1, tail, tip2) {
-         var a1 = Angle.angle(tail, tip1);
-         var a2 = Angle.angle(tail, tip2);
-         var angDel = a2 - a1;
-         if (angDel <= -Math.PI) { return angDel + Angle.PI_TIMES_2 }
-         if (angDel > Math.PI) { return angDel - Angle.PI_TIMES_2 }
-         return angDel
-       };
-       staticAccessors$29.PI_TIMES_2.get = function () { return 2.0 * Math.PI };
-       staticAccessors$29.PI_OVER_2.get = function () { return Math.PI / 2.0 };
-       staticAccessors$29.PI_OVER_4.get = function () { return Math.PI / 4.0 };
-       staticAccessors$29.COUNTERCLOCKWISE.get = function () { return CGAlgorithms.COUNTERCLOCKWISE };
-       staticAccessors$29.CLOCKWISE.get = function () { return CGAlgorithms.CLOCKWISE };
-       staticAccessors$29.NONE.get = function () { return CGAlgorithms.COLLINEAR };
-
-       Object.defineProperties( Angle, staticAccessors$29 );
-
-       var OffsetSegmentGenerator = function OffsetSegmentGenerator () {
-         this._maxCurveSegmentError = 0.0;
-         this._filletAngleQuantum = null;
-         this._closingSegLengthFactor = 1;
-         this._segList = null;
-         this._distance = 0.0;
-         this._precisionModel = null;
-         this._bufParams = null;
-         this._li = null;
-         this._s0 = null;
-         this._s1 = null;
-         this._s2 = null;
-         this._seg0 = new LineSegment();
-         this._seg1 = new LineSegment();
-         this._offset0 = new LineSegment();
-         this._offset1 = new LineSegment();
-         this._side = 0;
-         this._hasNarrowConcaveAngle = false;
-         var precisionModel = arguments[0];
-         var bufParams = arguments[1];
-         var distance = arguments[2];
-         this._precisionModel = precisionModel;
-         this._bufParams = bufParams;
-         this._li = new RobustLineIntersector();
-         this._filletAngleQuantum = Math.PI / 2.0 / bufParams.getQuadrantSegments();
-         if (bufParams.getQuadrantSegments() >= 8 && bufParams.getJoinStyle() === BufferParameters.JOIN_ROUND) { this._closingSegLengthFactor = OffsetSegmentGenerator.MAX_CLOSING_SEG_LEN_FACTOR; }
-         this.init(distance);
-       };
+         return sidebar;
+       }
 
-       var staticAccessors$27 = { OFFSET_SEGMENT_SEPARATION_FACTOR: { configurable: true },INSIDE_TURN_VERTEX_SNAP_DISTANCE_FACTOR: { configurable: true },CURVE_VERTEX_SNAP_DISTANCE_FACTOR: { configurable: true },MAX_CLOSING_SEG_LEN_FACTOR: { configurable: true } };
-       OffsetSegmentGenerator.prototype.addNextSegment = function addNextSegment (p, addStartPoint) {
-         this._s0 = this._s1;
-         this._s1 = this._s2;
-         this._s2 = p;
-         this._seg0.setCoordinates(this._s0, this._s1);
-         this.computeOffsetSegment(this._seg0, this._side, this._distance, this._offset0);
-         this._seg1.setCoordinates(this._s1, this._s2);
-         this.computeOffsetSegment(this._seg1, this._side, this._distance, this._offset1);
-         if (this._s1.equals(this._s2)) { return null }
-         var orientation = CGAlgorithms.computeOrientation(this._s0, this._s1, this._s2);
-         var outsideTurn = (orientation === CGAlgorithms.CLOCKWISE && this._side === Position.LEFT) || (orientation === CGAlgorithms.COUNTERCLOCKWISE && this._side === Position.RIGHT);
-         if (orientation === 0) {
-           this.addCollinear(addStartPoint);
-         } else if (outsideTurn) {
-           this.addOutsideTurn(orientation, addStartPoint);
-         } else {
-           this.addInsideTurn(orientation, addStartPoint);
-         }
-       };
-       OffsetSegmentGenerator.prototype.addLineEndCap = function addLineEndCap (p0, p1) {
-         var seg = new LineSegment(p0, p1);
-         var offsetL = new LineSegment();
-         this.computeOffsetSegment(seg, Position.LEFT, this._distance, offsetL);
-         var offsetR = new LineSegment();
-         this.computeOffsetSegment(seg, Position.RIGHT, this._distance, offsetR);
-         var dx = p1.x - p0.x;
-         var dy = p1.y - p0.y;
-         var angle = Math.atan2(dy, dx);
-         switch (this._bufParams.getEndCapStyle()) {
-           case BufferParameters.CAP_ROUND:
-             this._segList.addPt(offsetL.p1);
-             this.addFilletArc(p1, angle + Math.PI / 2, angle - Math.PI / 2, CGAlgorithms.CLOCKWISE, this._distance);
-             this._segList.addPt(offsetR.p1);
-             break
-           case BufferParameters.CAP_FLAT:
-             this._segList.addPt(offsetL.p1);
-             this._segList.addPt(offsetR.p1);
-             break
-           case BufferParameters.CAP_SQUARE:
-             var squareCapSideOffset = new Coordinate();
-             squareCapSideOffset.x = Math.abs(this._distance) * Math.cos(angle);
-             squareCapSideOffset.y = Math.abs(this._distance) * Math.sin(angle);
-             var squareCapLOffset = new Coordinate(offsetL.p1.x + squareCapSideOffset.x, offsetL.p1.y + squareCapSideOffset.y);
-             var squareCapROffset = new Coordinate(offsetR.p1.x + squareCapSideOffset.x, offsetR.p1.y + squareCapSideOffset.y);
-             this._segList.addPt(squareCapLOffset);
-             this._segList.addPt(squareCapROffset);
-             break
-         }
-       };
-       OffsetSegmentGenerator.prototype.getCoordinates = function getCoordinates () {
-         var pts = this._segList.getCoordinates();
-         return pts
-       };
-       OffsetSegmentGenerator.prototype.addMitreJoin = function addMitreJoin (p, offset0, offset1, distance) {
-         var isMitreWithinLimit = true;
-         var intPt = null;
-         try {
-           intPt = HCoordinate.intersection(offset0.p0, offset0.p1, offset1.p0, offset1.p1);
-           var mitreRatio = distance <= 0.0 ? 1.0 : intPt.distance(p) / Math.abs(distance);
-           if (mitreRatio > this._bufParams.getMitreLimit()) { isMitreWithinLimit = false; }
-         } catch (ex) {
-           if (ex instanceof NotRepresentableException) {
-             intPt = new Coordinate(0, 0);
-             isMitreWithinLimit = false;
-           } else { throw ex }
-         } finally {}
-         if (isMitreWithinLimit) {
-           this._segList.addPt(intPt);
-         } else {
-           this.addLimitedMitreJoin(offset0, offset1, distance, this._bufParams.getMitreLimit());
-         }
-       };
-       OffsetSegmentGenerator.prototype.addFilletCorner = function addFilletCorner (p, p0, p1, direction, radius) {
-         var dx0 = p0.x - p.x;
-         var dy0 = p0.y - p.y;
-         var startAngle = Math.atan2(dy0, dx0);
-         var dx1 = p1.x - p.x;
-         var dy1 = p1.y - p.y;
-         var endAngle = Math.atan2(dy1, dx1);
-         if (direction === CGAlgorithms.CLOCKWISE) {
-           if (startAngle <= endAngle) { startAngle += 2.0 * Math.PI; }
-         } else {
-           if (startAngle >= endAngle) { startAngle -= 2.0 * Math.PI; }
-         }
-         this._segList.addPt(p0);
-         this.addFilletArc(p, startAngle, endAngle, direction, radius);
-         this._segList.addPt(p1);
-       };
-       OffsetSegmentGenerator.prototype.addOutsideTurn = function addOutsideTurn (orientation, addStartPoint) {
-         if (this._offset0.p1.distance(this._offset1.p0) < this._distance * OffsetSegmentGenerator.OFFSET_SEGMENT_SEPARATION_FACTOR) {
-           this._segList.addPt(this._offset0.p1);
-           return null
-         }
-         if (this._bufParams.getJoinStyle() === BufferParameters.JOIN_MITRE) {
-           this.addMitreJoin(this._s1, this._offset0, this._offset1, this._distance);
-         } else if (this._bufParams.getJoinStyle() === BufferParameters.JOIN_BEVEL) {
-           this.addBevelJoin(this._offset0, this._offset1);
-         } else {
-           if (addStartPoint) { this._segList.addPt(this._offset0.p1); }
-           this.addFilletCorner(this._s1, this._offset0.p1, this._offset1.p0, orientation, this._distance);
-           this._segList.addPt(this._offset1.p0);
-         }
-       };
-       OffsetSegmentGenerator.prototype.createSquare = function createSquare (p) {
-         this._segList.addPt(new Coordinate(p.x + this._distance, p.y + this._distance));
-         this._segList.addPt(new Coordinate(p.x + this._distance, p.y - this._distance));
-         this._segList.addPt(new Coordinate(p.x - this._distance, p.y - this._distance));
-         this._segList.addPt(new Coordinate(p.x - this._distance, p.y + this._distance));
-         this._segList.closeRing();
-       };
-       OffsetSegmentGenerator.prototype.addSegments = function addSegments (pt, isForward) {
-         this._segList.addPts(pt, isForward);
-       };
-       OffsetSegmentGenerator.prototype.addFirstSegment = function addFirstSegment () {
-         this._segList.addPt(this._offset1.p0);
-       };
-       OffsetSegmentGenerator.prototype.addLastSegment = function addLastSegment () {
-         this._segList.addPt(this._offset1.p1);
-       };
-       OffsetSegmentGenerator.prototype.initSideSegments = function initSideSegments (s1, s2, side) {
-         this._s1 = s1;
-         this._s2 = s2;
-         this._side = side;
-         this._seg1.setCoordinates(s1, s2);
-         this.computeOffsetSegment(this._seg1, side, this._distance, this._offset1);
-       };
-       OffsetSegmentGenerator.prototype.addLimitedMitreJoin = function addLimitedMitreJoin (offset0, offset1, distance, mitreLimit) {
-         var basePt = this._seg0.p1;
-         var ang0 = Angle.angle(basePt, this._seg0.p0);
-         // const ang1 = Angle.angle(basePt, this._seg1.p1)
-         var angDiff = Angle.angleBetweenOriented(this._seg0.p0, basePt, this._seg1.p1);
-         var angDiffHalf = angDiff / 2;
-         var midAng = Angle.normalize(ang0 + angDiffHalf);
-         var mitreMidAng = Angle.normalize(midAng + Math.PI);
-         var mitreDist = mitreLimit * distance;
-         var bevelDelta = mitreDist * Math.abs(Math.sin(angDiffHalf));
-         var bevelHalfLen = distance - bevelDelta;
-         var bevelMidX = basePt.x + mitreDist * Math.cos(mitreMidAng);
-         var bevelMidY = basePt.y + mitreDist * Math.sin(mitreMidAng);
-         var bevelMidPt = new Coordinate(bevelMidX, bevelMidY);
-         var mitreMidLine = new LineSegment(basePt, bevelMidPt);
-         var bevelEndLeft = mitreMidLine.pointAlongOffset(1.0, bevelHalfLen);
-         var bevelEndRight = mitreMidLine.pointAlongOffset(1.0, -bevelHalfLen);
-         if (this._side === Position.LEFT) {
-           this._segList.addPt(bevelEndLeft);
-           this._segList.addPt(bevelEndRight);
-         } else {
-           this._segList.addPt(bevelEndRight);
-           this._segList.addPt(bevelEndLeft);
-         }
-       };
-       OffsetSegmentGenerator.prototype.computeOffsetSegment = function computeOffsetSegment (seg, side, distance, offset) {
-         var sideSign = side === Position.LEFT ? 1 : -1;
-         var dx = seg.p1.x - seg.p0.x;
-         var dy = seg.p1.y - seg.p0.y;
-         var len = Math.sqrt(dx * dx + dy * dy);
-         var ux = sideSign * distance * dx / len;
-         var uy = sideSign * distance * dy / len;
-         offset.p0.x = seg.p0.x - uy;
-         offset.p0.y = seg.p0.y + ux;
-         offset.p1.x = seg.p1.x - uy;
-         offset.p1.y = seg.p1.y + ux;
-       };
-       OffsetSegmentGenerator.prototype.addFilletArc = function addFilletArc (p, startAngle, endAngle, direction, radius) {
-           var this$1 = this;
-
-         var directionFactor = direction === CGAlgorithms.CLOCKWISE ? -1 : 1;
-         var totalAngle = Math.abs(startAngle - endAngle);
-         var nSegs = Math.trunc(totalAngle / this._filletAngleQuantum + 0.5);
-         if (nSegs < 1) { return null }
-         var initAngle = 0.0;
-         var currAngleInc = totalAngle / nSegs;
-         var currAngle = initAngle;
-         var pt = new Coordinate();
-         while (currAngle < totalAngle) {
-           var angle = startAngle + directionFactor * currAngle;
-           pt.x = p.x + radius * Math.cos(angle);
-           pt.y = p.y + radius * Math.sin(angle);
-           this$1._segList.addPt(pt);
-           currAngle += currAngleInc;
-         }
-       };
-       OffsetSegmentGenerator.prototype.addInsideTurn = function addInsideTurn (orientation, addStartPoint) {
-         this._li.computeIntersection(this._offset0.p0, this._offset0.p1, this._offset1.p0, this._offset1.p1);
-         if (this._li.hasIntersection()) {
-           this._segList.addPt(this._li.getIntersection(0));
-         } else {
-           this._hasNarrowConcaveAngle = true;
-           if (this._offset0.p1.distance(this._offset1.p0) < this._distance * OffsetSegmentGenerator.INSIDE_TURN_VERTEX_SNAP_DISTANCE_FACTOR) {
-             this._segList.addPt(this._offset0.p1);
-           } else {
-             this._segList.addPt(this._offset0.p1);
-             if (this._closingSegLengthFactor > 0) {
-               var mid0 = new Coordinate((this._closingSegLengthFactor * this._offset0.p1.x + this._s1.x) / (this._closingSegLengthFactor + 1), (this._closingSegLengthFactor * this._offset0.p1.y + this._s1.y) / (this._closingSegLengthFactor + 1));
-               this._segList.addPt(mid0);
-               var mid1 = new Coordinate((this._closingSegLengthFactor * this._offset1.p0.x + this._s1.x) / (this._closingSegLengthFactor + 1), (this._closingSegLengthFactor * this._offset1.p0.y + this._s1.y) / (this._closingSegLengthFactor + 1));
-               this._segList.addPt(mid1);
-             } else {
-               this._segList.addPt(this._s1);
-             }
-             this._segList.addPt(this._offset1.p0);
-           }
-         }
-       };
-       OffsetSegmentGenerator.prototype.createCircle = function createCircle (p) {
-         var pt = new Coordinate(p.x + this._distance, p.y);
-         this._segList.addPt(pt);
-         this.addFilletArc(p, 0.0, 2.0 * Math.PI, -1, this._distance);
-         this._segList.closeRing();
-       };
-       OffsetSegmentGenerator.prototype.addBevelJoin = function addBevelJoin (offset0, offset1) {
-         this._segList.addPt(offset0.p1);
-         this._segList.addPt(offset1.p0);
-       };
-       OffsetSegmentGenerator.prototype.init = function init (distance) {
-         this._distance = distance;
-         this._maxCurveSegmentError = distance * (1 - Math.cos(this._filletAngleQuantum / 2.0));
-         this._segList = new OffsetSegmentString();
-         this._segList.setPrecisionModel(this._precisionModel);
-         this._segList.setMinimumVertexDistance(distance * OffsetSegmentGenerator.CURVE_VERTEX_SNAP_DISTANCE_FACTOR);
-       };
-       OffsetSegmentGenerator.prototype.addCollinear = function addCollinear (addStartPoint) {
-         this._li.computeIntersection(this._s0, this._s1, this._s1, this._s2);
-         var numInt = this._li.getIntersectionNum();
-         if (numInt >= 2) {
-           if (this._bufParams.getJoinStyle() === BufferParameters.JOIN_BEVEL || this._bufParams.getJoinStyle() === BufferParameters.JOIN_MITRE) {
-             if (addStartPoint) { this._segList.addPt(this._offset0.p1); }
-             this._segList.addPt(this._offset1.p0);
-           } else {
-             this.addFilletCorner(this._s1, this._offset0.p1, this._offset1.p0, CGAlgorithms.CLOCKWISE, this._distance);
-           }
-         }
-       };
-       OffsetSegmentGenerator.prototype.closeRing = function closeRing () {
-         this._segList.closeRing();
-       };
-       OffsetSegmentGenerator.prototype.hasNarrowConcaveAngle = function hasNarrowConcaveAngle () {
-         return this._hasNarrowConcaveAngle
-       };
-       OffsetSegmentGenerator.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       OffsetSegmentGenerator.prototype.getClass = function getClass () {
-         return OffsetSegmentGenerator
-       };
-       staticAccessors$27.OFFSET_SEGMENT_SEPARATION_FACTOR.get = function () { return 1.0E-3 };
-       staticAccessors$27.INSIDE_TURN_VERTEX_SNAP_DISTANCE_FACTOR.get = function () { return 1.0E-3 };
-       staticAccessors$27.CURVE_VERTEX_SNAP_DISTANCE_FACTOR.get = function () { return 1.0E-6 };
-       staticAccessors$27.MAX_CLOSING_SEG_LEN_FACTOR.get = function () { return 80 };
-
-       Object.defineProperties( OffsetSegmentGenerator, staticAccessors$27 );
-
-       var OffsetCurveBuilder = function OffsetCurveBuilder () {
-         this._distance = 0.0;
-         this._precisionModel = null;
-         this._bufParams = null;
-         var precisionModel = arguments[0];
-         var bufParams = arguments[1];
-         this._precisionModel = precisionModel;
-         this._bufParams = bufParams;
-       };
-       OffsetCurveBuilder.prototype.getOffsetCurve = function getOffsetCurve (inputPts, distance) {
-         this._distance = distance;
-         if (distance === 0.0) { return null }
-         var isRightSide = distance < 0.0;
-         var posDistance = Math.abs(distance);
-         var segGen = this.getSegGen(posDistance);
-         if (inputPts.length <= 1) {
-           this.computePointCurve(inputPts[0], segGen);
-         } else {
-           this.computeOffsetCurve(inputPts, isRightSide, segGen);
-         }
-         var curvePts = segGen.getCoordinates();
-         if (isRightSide) { CoordinateArrays.reverse(curvePts); }
-         return curvePts
-       };
-       OffsetCurveBuilder.prototype.computeSingleSidedBufferCurve = function computeSingleSidedBufferCurve (inputPts, isRightSide, segGen) {
-         var distTol = this.simplifyTolerance(this._distance);
-         if (isRightSide) {
-           segGen.addSegments(inputPts, true);
-           var simp2 = BufferInputLineSimplifier.simplify(inputPts, -distTol);
-           var n2 = simp2.length - 1;
-           segGen.initSideSegments(simp2[n2], simp2[n2 - 1], Position.LEFT);
-           segGen.addFirstSegment();
-           for (var i = n2 - 2; i >= 0; i--) {
-             segGen.addNextSegment(simp2[i], true);
-           }
-         } else {
-           segGen.addSegments(inputPts, false);
-           var simp1 = BufferInputLineSimplifier.simplify(inputPts, distTol);
-           var n1 = simp1.length - 1;
-           segGen.initSideSegments(simp1[0], simp1[1], Position.LEFT);
-           segGen.addFirstSegment();
-           for (var i$1 = 2; i$1 <= n1; i$1++) {
-             segGen.addNextSegment(simp1[i$1], true);
-           }
-         }
-         segGen.addLastSegment();
-         segGen.closeRing();
-       };
-       OffsetCurveBuilder.prototype.computeRingBufferCurve = function computeRingBufferCurve (inputPts, side, segGen) {
-         var distTol = this.simplifyTolerance(this._distance);
-         if (side === Position.RIGHT) { distTol = -distTol; }
-         var simp = BufferInputLineSimplifier.simplify(inputPts, distTol);
-         var n = simp.length - 1;
-         segGen.initSideSegments(simp[n - 1], simp[0], side);
-         for (var i = 1; i <= n; i++) {
-           var addStartPoint = i !== 1;
-           segGen.addNextSegment(simp[i], addStartPoint);
-         }
-         segGen.closeRing();
-       };
-       OffsetCurveBuilder.prototype.computeLineBufferCurve = function computeLineBufferCurve (inputPts, segGen) {
-         var distTol = this.simplifyTolerance(this._distance);
-         var simp1 = BufferInputLineSimplifier.simplify(inputPts, distTol);
-         var n1 = simp1.length - 1;
-         segGen.initSideSegments(simp1[0], simp1[1], Position.LEFT);
-         for (var i = 2; i <= n1; i++) {
-           segGen.addNextSegment(simp1[i], true);
-         }
-         segGen.addLastSegment();
-         segGen.addLineEndCap(simp1[n1 - 1], simp1[n1]);
-         var simp2 = BufferInputLineSimplifier.simplify(inputPts, -distTol);
-         var n2 = simp2.length - 1;
-         segGen.initSideSegments(simp2[n2], simp2[n2 - 1], Position.LEFT);
-         for (var i$1 = n2 - 2; i$1 >= 0; i$1--) {
-           segGen.addNextSegment(simp2[i$1], true);
-         }
-         segGen.addLastSegment();
-         segGen.addLineEndCap(simp2[1], simp2[0]);
-         segGen.closeRing();
-       };
-       OffsetCurveBuilder.prototype.computePointCurve = function computePointCurve (pt, segGen) {
-         switch (this._bufParams.getEndCapStyle()) {
-           case BufferParameters.CAP_ROUND:
-             segGen.createCircle(pt);
-             break
-           case BufferParameters.CAP_SQUARE:
-             segGen.createSquare(pt);
-             break
-         }
-       };
-       OffsetCurveBuilder.prototype.getLineCurve = function getLineCurve (inputPts, distance) {
-         this._distance = distance;
-         if (distance < 0.0 && !this._bufParams.isSingleSided()) { return null }
-         if (distance === 0.0) { return null }
-         var posDistance = Math.abs(distance);
-         var segGen = this.getSegGen(posDistance);
-         if (inputPts.length <= 1) {
-           this.computePointCurve(inputPts[0], segGen);
-         } else {
-           if (this._bufParams.isSingleSided()) {
-             var isRightSide = distance < 0.0;
-             this.computeSingleSidedBufferCurve(inputPts, isRightSide, segGen);
-           } else { this.computeLineBufferCurve(inputPts, segGen); }
-         }
-         var lineCoord = segGen.getCoordinates();
-         return lineCoord
-       };
-       OffsetCurveBuilder.prototype.getBufferParameters = function getBufferParameters () {
-         return this._bufParams
-       };
-       OffsetCurveBuilder.prototype.simplifyTolerance = function simplifyTolerance (bufDistance) {
-         return bufDistance * this._bufParams.getSimplifyFactor()
-       };
-       OffsetCurveBuilder.prototype.getRingCurve = function getRingCurve (inputPts, side, distance) {
-         this._distance = distance;
-         if (inputPts.length <= 2) { return this.getLineCurve(inputPts, distance) }
-         if (distance === 0.0) {
-           return OffsetCurveBuilder.copyCoordinates(inputPts)
-         }
-         var segGen = this.getSegGen(distance);
-         this.computeRingBufferCurve(inputPts, side, segGen);
-         return segGen.getCoordinates()
-       };
-       OffsetCurveBuilder.prototype.computeOffsetCurve = function computeOffsetCurve (inputPts, isRightSide, segGen) {
-         var distTol = this.simplifyTolerance(this._distance);
-         if (isRightSide) {
-           var simp2 = BufferInputLineSimplifier.simplify(inputPts, -distTol);
-           var n2 = simp2.length - 1;
-           segGen.initSideSegments(simp2[n2], simp2[n2 - 1], Position.LEFT);
-           segGen.addFirstSegment();
-           for (var i = n2 - 2; i >= 0; i--) {
-             segGen.addNextSegment(simp2[i], true);
-           }
-         } else {
-           var simp1 = BufferInputLineSimplifier.simplify(inputPts, distTol);
-           var n1 = simp1.length - 1;
-           segGen.initSideSegments(simp1[0], simp1[1], Position.LEFT);
-           segGen.addFirstSegment();
-           for (var i$1 = 2; i$1 <= n1; i$1++) {
-             segGen.addNextSegment(simp1[i$1], true);
-           }
-         }
-         segGen.addLastSegment();
-       };
-       OffsetCurveBuilder.prototype.getSegGen = function getSegGen (distance) {
-         return new OffsetSegmentGenerator(this._precisionModel, this._bufParams, distance)
-       };
-       OffsetCurveBuilder.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       OffsetCurveBuilder.prototype.getClass = function getClass () {
-         return OffsetCurveBuilder
-       };
-       OffsetCurveBuilder.copyCoordinates = function copyCoordinates (pts) {
-         var copy = new Array(pts.length).fill(null);
-         for (var i = 0; i < copy.length; i++) {
-           copy[i] = new Coordinate(pts[i]);
-         }
-         return copy
-       };
+       function uiSourceSwitch(context) {
+         var keys;
 
-       var SubgraphDepthLocater = function SubgraphDepthLocater () {
-         this._subgraphs = null;
-         this._seg = new LineSegment();
-         this._cga = new CGAlgorithms();
-         var subgraphs = arguments[0];
-         this._subgraphs = subgraphs;
-       };
+         function click(d3_event) {
+           d3_event.preventDefault();
+           var osm = context.connection();
+           if (!osm) return;
+           if (context.inIntro()) return;
+           if (context.history().hasChanges() && !window.confirm(_t('source_switch.lose_changes'))) return;
+           var isLive = select(this).classed('live');
+           isLive = !isLive;
+           context.enter(modeBrowse(context));
+           context.history().clearSaved(); // remove saved history
 
-       var staticAccessors$30 = { DepthSegment: { configurable: true } };
-       SubgraphDepthLocater.prototype.findStabbedSegments = function findStabbedSegments () {
-           var this$1 = this;
+           context.flush(); // remove stored data
 
-         if (arguments.length === 1) {
-           var stabbingRayLeftPt = arguments[0];
-           var stabbedSegments = new ArrayList();
-           for (var i = this._subgraphs.iterator(); i.hasNext();) {
-             var bsg = i.next();
-             var env = bsg.getEnvelope();
-             if (stabbingRayLeftPt.y < env.getMinY() || stabbingRayLeftPt.y > env.getMaxY()) { continue }
-             this$1.findStabbedSegments(stabbingRayLeftPt, bsg.getDirectedEdges(), stabbedSegments);
-           }
-           return stabbedSegments
-         } else if (arguments.length === 3) {
-           if (hasInterface(arguments[2], List) && (arguments[0] instanceof Coordinate && arguments[1] instanceof DirectedEdge)) {
-             var stabbingRayLeftPt$1 = arguments[0];
-             var dirEdge = arguments[1];
-             var stabbedSegments$1 = arguments[2];
-             var pts = dirEdge.getEdge().getCoordinates();
-             for (var i$1 = 0; i$1 < pts.length - 1; i$1++) {
-               this$1._seg.p0 = pts[i$1];
-               this$1._seg.p1 = pts[i$1 + 1];
-               if (this$1._seg.p0.y > this$1._seg.p1.y) { this$1._seg.reverse(); }
-               var maxx = Math.max(this$1._seg.p0.x, this$1._seg.p1.x);
-               if (maxx < stabbingRayLeftPt$1.x) { continue }
-               if (this$1._seg.isHorizontal()) { continue }
-               if (stabbingRayLeftPt$1.y < this$1._seg.p0.y || stabbingRayLeftPt$1.y > this$1._seg.p1.y) { continue }
-               if (CGAlgorithms.computeOrientation(this$1._seg.p0, this$1._seg.p1, stabbingRayLeftPt$1) === CGAlgorithms.RIGHT) { continue }
-               var depth = dirEdge.getDepth(Position.LEFT);
-               if (!this$1._seg.p0.equals(pts[i$1])) { depth = dirEdge.getDepth(Position.RIGHT); }
-               var ds = new DepthSegment(this$1._seg, depth);
-               stabbedSegments$1.add(ds);
-             }
-           } else if (hasInterface(arguments[2], List) && (arguments[0] instanceof Coordinate && hasInterface(arguments[1], List))) {
-             var stabbingRayLeftPt$2 = arguments[0];
-             var dirEdges = arguments[1];
-             var stabbedSegments$2 = arguments[2];
-             for (var i$2 = dirEdges.iterator(); i$2.hasNext();) {
-               var de = i$2.next();
-               if (!de.isForward()) { continue }
-               this$1.findStabbedSegments(stabbingRayLeftPt$2, de, stabbedSegments$2);
-             }
-           }
+           select(this).html(isLive ? _t.html('source_switch.live') : _t.html('source_switch.dev')).classed('live', isLive).classed('chip', isLive);
+           osm["switch"](isLive ? keys[0] : keys[1]); // switch connection (warning: dispatches 'change' event)
          }
-       };
-       SubgraphDepthLocater.prototype.getDepth = function getDepth (p) {
-         var stabbedSegments = this.findStabbedSegments(p);
-         if (stabbedSegments.size() === 0) { return 0 }
-         var ds = Collections.min(stabbedSegments);
-         return ds._leftDepth
-       };
-       SubgraphDepthLocater.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       SubgraphDepthLocater.prototype.getClass = function getClass () {
-         return SubgraphDepthLocater
-       };
-       staticAccessors$30.DepthSegment.get = function () { return DepthSegment };
 
-       Object.defineProperties( SubgraphDepthLocater, staticAccessors$30 );
-
-       var DepthSegment = function DepthSegment () {
-         this._upwardSeg = null;
-         this._leftDepth = null;
-         var seg = arguments[0];
-         var depth = arguments[1];
-         this._upwardSeg = new LineSegment(seg);
-         this._leftDepth = depth;
-       };
-       DepthSegment.prototype.compareTo = function compareTo (obj) {
-         var other = obj;
-         if (this._upwardSeg.minX() >= other._upwardSeg.maxX()) { return 1 }
-         if (this._upwardSeg.maxX() <= other._upwardSeg.minX()) { return -1 }
-         var orientIndex = this._upwardSeg.orientationIndex(other._upwardSeg);
-         if (orientIndex !== 0) { return orientIndex }
-         orientIndex = -1 * other._upwardSeg.orientationIndex(this._upwardSeg);
-         if (orientIndex !== 0) { return orientIndex }
-         return this._upwardSeg.compareTo(other._upwardSeg)
-       };
-       DepthSegment.prototype.compareX = function compareX (seg0, seg1) {
-         var compare0 = seg0.p0.compareTo(seg1.p0);
-         if (compare0 !== 0) { return compare0 }
-         return seg0.p1.compareTo(seg1.p1)
-       };
-       DepthSegment.prototype.toString = function toString () {
-         return this._upwardSeg.toString()
-       };
-       DepthSegment.prototype.interfaces_ = function interfaces_ () {
-         return [Comparable]
-       };
-       DepthSegment.prototype.getClass = function getClass () {
-         return DepthSegment
-       };
+         var sourceSwitch = function sourceSwitch(selection) {
+           selection.append('a').attr('href', '#').html(_t.html('source_switch.live')).attr('class', 'live chip').on('click', click);
+         };
 
-       var Triangle = function Triangle (p0, p1, p2) {
-         this.p0 = p0 || null;
-         this.p1 = p1 || null;
-         this.p2 = p2 || null;
-       };
-       Triangle.prototype.area = function area () {
-         return Triangle.area(this.p0, this.p1, this.p2)
-       };
-       Triangle.prototype.signedArea = function signedArea () {
-         return Triangle.signedArea(this.p0, this.p1, this.p2)
-       };
-       Triangle.prototype.interpolateZ = function interpolateZ (p) {
-         if (p === null) { throw new IllegalArgumentException('Supplied point is null.') }
-         return Triangle.interpolateZ(p, this.p0, this.p1, this.p2)
-       };
-       Triangle.prototype.longestSideLength = function longestSideLength () {
-         return Triangle.longestSideLength(this.p0, this.p1, this.p2)
-       };
-       Triangle.prototype.isAcute = function isAcute () {
-         return Triangle.isAcute(this.p0, this.p1, this.p2)
-       };
-       Triangle.prototype.circumcentre = function circumcentre () {
-         return Triangle.circumcentre(this.p0, this.p1, this.p2)
-       };
-       Triangle.prototype.area3D = function area3D () {
-         return Triangle.area3D(this.p0, this.p1, this.p2)
-       };
-       Triangle.prototype.centroid = function centroid () {
-         return Triangle.centroid(this.p0, this.p1, this.p2)
-       };
-       Triangle.prototype.inCentre = function inCentre () {
-         return Triangle.inCentre(this.p0, this.p1, this.p2)
-       };
-       Triangle.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       Triangle.prototype.getClass = function getClass () {
-         return Triangle
-       };
-       Triangle.area = function area (a, b, c) {
-         return Math.abs(((c.x - a.x) * (b.y - a.y) - (b.x - a.x) * (c.y - a.y)) / 2)
-       };
-       Triangle.signedArea = function signedArea (a, b, c) {
-         return ((c.x - a.x) * (b.y - a.y) - (b.x - a.x) * (c.y - a.y)) / 2
-       };
-       Triangle.det = function det (m00, m01, m10, m11) {
-         return m00 * m11 - m01 * m10
-       };
-       Triangle.interpolateZ = function interpolateZ (p, v0, v1, v2) {
-         var x0 = v0.x;
-         var y0 = v0.y;
-         var a = v1.x - x0;
-         var b = v2.x - x0;
-         var c = v1.y - y0;
-         var d = v2.y - y0;
-         var det = a * d - b * c;
-         var dx = p.x - x0;
-         var dy = p.y - y0;
-         var t = (d * dx - b * dy) / det;
-         var u = (-c * dx + a * dy) / det;
-         var z = v0.z + t * (v1.z - v0.z) + u * (v2.z - v0.z);
-         return z
-       };
-       Triangle.longestSideLength = function longestSideLength (a, b, c) {
-         var lenAB = a.distance(b);
-         var lenBC = b.distance(c);
-         var lenCA = c.distance(a);
-         var maxLen = lenAB;
-         if (lenBC > maxLen) { maxLen = lenBC; }
-         if (lenCA > maxLen) { maxLen = lenCA; }
-         return maxLen
-       };
-       Triangle.isAcute = function isAcute (a, b, c) {
-         if (!Angle.isAcute(a, b, c)) { return false }
-         if (!Angle.isAcute(b, c, a)) { return false }
-         if (!Angle.isAcute(c, a, b)) { return false }
-         return true
-       };
-       Triangle.circumcentre = function circumcentre (a, b, c) {
-         var cx = c.x;
-         var cy = c.y;
-         var ax = a.x - cx;
-         var ay = a.y - cy;
-         var bx = b.x - cx;
-         var by = b.y - cy;
-         var denom = 2 * Triangle.det(ax, ay, bx, by);
-         var numx = Triangle.det(ay, ax * ax + ay * ay, by, bx * bx + by * by);
-         var numy = Triangle.det(ax, ax * ax + ay * ay, bx, bx * bx + by * by);
-         var ccx = cx - numx / denom;
-         var ccy = cy + numy / denom;
-         return new Coordinate(ccx, ccy)
-       };
-       Triangle.perpendicularBisector = function perpendicularBisector (a, b) {
-         var dx = b.x - a.x;
-         var dy = b.y - a.y;
-         var l1 = new HCoordinate(a.x + dx / 2.0, a.y + dy / 2.0, 1.0);
-         var l2 = new HCoordinate(a.x - dy + dx / 2.0, a.y + dx + dy / 2.0, 1.0);
-         return new HCoordinate(l1, l2)
-       };
-       Triangle.angleBisector = function angleBisector (a, b, c) {
-         var len0 = b.distance(a);
-         var len2 = b.distance(c);
-         var frac = len0 / (len0 + len2);
-         var dx = c.x - a.x;
-         var dy = c.y - a.y;
-         var splitPt = new Coordinate(a.x + frac * dx, a.y + frac * dy);
-         return splitPt
-       };
-       Triangle.area3D = function area3D (a, b, c) {
-         var ux = b.x - a.x;
-         var uy = b.y - a.y;
-         var uz = b.z - a.z;
-         var vx = c.x - a.x;
-         var vy = c.y - a.y;
-         var vz = c.z - a.z;
-         var crossx = uy * vz - uz * vy;
-         var crossy = uz * vx - ux * vz;
-         var crossz = ux * vy - uy * vx;
-         var absSq = crossx * crossx + crossy * crossy + crossz * crossz;
-         var area3D = Math.sqrt(absSq) / 2;
-         return area3D
-       };
-       Triangle.centroid = function centroid (a, b, c) {
-         var x = (a.x + b.x + c.x) / 3;
-         var y = (a.y + b.y + c.y) / 3;
-         return new Coordinate(x, y)
-       };
-       Triangle.inCentre = function inCentre (a, b, c) {
-         var len0 = b.distance(c);
-         var len1 = a.distance(c);
-         var len2 = a.distance(b);
-         var circum = len0 + len1 + len2;
-         var inCentreX = (len0 * a.x + len1 * b.x + len2 * c.x) / circum;
-         var inCentreY = (len0 * a.y + len1 * b.y + len2 * c.y) / circum;
-         return new Coordinate(inCentreX, inCentreY)
-       };
+         sourceSwitch.keys = function (_) {
+           if (!arguments.length) return keys;
+           keys = _;
+           return sourceSwitch;
+         };
 
-       var OffsetCurveSetBuilder = function OffsetCurveSetBuilder () {
-         this._inputGeom = null;
-         this._distance = null;
-         this._curveBuilder = null;
-         this._curveList = new ArrayList();
-         var inputGeom = arguments[0];
-         var distance = arguments[1];
-         var curveBuilder = arguments[2];
-         this._inputGeom = inputGeom;
-         this._distance = distance;
-         this._curveBuilder = curveBuilder;
-       };
-       OffsetCurveSetBuilder.prototype.addPoint = function addPoint (p) {
-         if (this._distance <= 0.0) { return null }
-         var coord = p.getCoordinates();
-         var curve = this._curveBuilder.getLineCurve(coord, this._distance);
-         this.addCurve(curve, Location.EXTERIOR, Location.INTERIOR);
-       };
-       OffsetCurveSetBuilder.prototype.addPolygon = function addPolygon (p) {
-           var this$1 = this;
-
-         var offsetDistance = this._distance;
-         var offsetSide = Position.LEFT;
-         if (this._distance < 0.0) {
-           offsetDistance = -this._distance;
-           offsetSide = Position.RIGHT;
-         }
-         var shell = p.getExteriorRing();
-         var shellCoord = CoordinateArrays.removeRepeatedPoints(shell.getCoordinates());
-         if (this._distance < 0.0 && this.isErodedCompletely(shell, this._distance)) { return null }
-         if (this._distance <= 0.0 && shellCoord.length < 3) { return null }
-         this.addPolygonRing(shellCoord, offsetDistance, offsetSide, Location.EXTERIOR, Location.INTERIOR);
-         for (var i = 0; i < p.getNumInteriorRing(); i++) {
-           var hole = p.getInteriorRingN(i);
-           var holeCoord = CoordinateArrays.removeRepeatedPoints(hole.getCoordinates());
-           if (this$1._distance > 0.0 && this$1.isErodedCompletely(hole, -this$1._distance)) { continue }
-           this$1.addPolygonRing(holeCoord, offsetDistance, Position.opposite(offsetSide), Location.INTERIOR, Location.EXTERIOR);
-         }
-       };
-       OffsetCurveSetBuilder.prototype.isTriangleErodedCompletely = function isTriangleErodedCompletely (triangleCoord, bufferDistance) {
-         var tri = new Triangle(triangleCoord[0], triangleCoord[1], triangleCoord[2]);
-         var inCentre = tri.inCentre();
-         var distToCentre = CGAlgorithms.distancePointLine(inCentre, tri.p0, tri.p1);
-         return distToCentre < Math.abs(bufferDistance)
-       };
-       OffsetCurveSetBuilder.prototype.addLineString = function addLineString (line) {
-         if (this._distance <= 0.0 && !this._curveBuilder.getBufferParameters().isSingleSided()) { return null }
-         var coord = CoordinateArrays.removeRepeatedPoints(line.getCoordinates());
-         var curve = this._curveBuilder.getLineCurve(coord, this._distance);
-         this.addCurve(curve, Location.EXTERIOR, Location.INTERIOR);
-       };
-       OffsetCurveSetBuilder.prototype.addCurve = function addCurve (coord, leftLoc, rightLoc) {
-         if (coord === null || coord.length < 2) { return null }
-         var e = new NodedSegmentString(coord, new Label(0, Location.BOUNDARY, leftLoc, rightLoc));
-         this._curveList.add(e);
-       };
-       OffsetCurveSetBuilder.prototype.getCurves = function getCurves () {
-         this.add(this._inputGeom);
-         return this._curveList
-       };
-       OffsetCurveSetBuilder.prototype.addPolygonRing = function addPolygonRing (coord, offsetDistance, side, cwLeftLoc, cwRightLoc) {
-         if (offsetDistance === 0.0 && coord.length < LinearRing.MINIMUM_VALID_SIZE) { return null }
-         var leftLoc = cwLeftLoc;
-         var rightLoc = cwRightLoc;
-         if (coord.length >= LinearRing.MINIMUM_VALID_SIZE && CGAlgorithms.isCCW(coord)) {
-           leftLoc = cwRightLoc;
-           rightLoc = cwLeftLoc;
-           side = Position.opposite(side);
-         }
-         var curve = this._curveBuilder.getRingCurve(coord, side, offsetDistance);
-         this.addCurve(curve, leftLoc, rightLoc);
-       };
-       OffsetCurveSetBuilder.prototype.add = function add (g) {
-         if (g.isEmpty()) { return null }
-         if (g instanceof Polygon) { this.addPolygon(g); }
-         else if (g instanceof LineString) { this.addLineString(g); }
-         else if (g instanceof Point$1) { this.addPoint(g); }
-         else if (g instanceof MultiPoint) { this.addCollection(g); }
-         else if (g instanceof MultiLineString) { this.addCollection(g); }
-         else if (g instanceof MultiPolygon) { this.addCollection(g); }
-         else if (g instanceof GeometryCollection) { this.addCollection(g); }
-         // else throw new UnsupportedOperationException(g.getClass().getName())
-       };
-       OffsetCurveSetBuilder.prototype.isErodedCompletely = function isErodedCompletely (ring, bufferDistance) {
-         var ringCoord = ring.getCoordinates();
-         // const minDiam = 0.0
-         if (ringCoord.length < 4) { return bufferDistance < 0 }
-         if (ringCoord.length === 4) { return this.isTriangleErodedCompletely(ringCoord, bufferDistance) }
-         var env = ring.getEnvelopeInternal();
-         var envMinDimension = Math.min(env.getHeight(), env.getWidth());
-         if (bufferDistance < 0.0 && 2 * Math.abs(bufferDistance) > envMinDimension) { return true }
-         return false
-       };
-       OffsetCurveSetBuilder.prototype.addCollection = function addCollection (gc) {
-           var this$1 = this;
+         return sourceSwitch;
+       }
 
-         for (var i = 0; i < gc.getNumGeometries(); i++) {
-           var g = gc.getGeometryN(i);
-           this$1.add(g);
-         }
-       };
-       OffsetCurveSetBuilder.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       OffsetCurveSetBuilder.prototype.getClass = function getClass () {
-         return OffsetCurveSetBuilder
-       };
+       function uiSpinner(context) {
+         var osm = context.connection();
+         return function (selection) {
+           var img = selection.append('img').attr('src', context.imagePath('loader-black.gif')).style('opacity', 0);
+
+           if (osm) {
+             osm.on('loading.spinner', function () {
+               img.transition().style('opacity', 1);
+             }).on('loaded.spinner', function () {
+               img.transition().style('opacity', 0);
+             });
+           }
+         };
+       }
 
-       var PointOnGeometryLocator = function PointOnGeometryLocator () {};
+       function uiSplash(context) {
+         return function (selection) {
+           // Exception - if there are restorable changes, skip this splash screen.
+           // This is because we currently only support one `uiModal` at a time
+           //  and we need to show them `uiRestore`` instead of this one.
+           if (context.history().hasRestorableChanges()) return; // If user has not seen this version of the privacy policy, show the splash again.
 
-       PointOnGeometryLocator.prototype.locate = function locate (p) {};
-       PointOnGeometryLocator.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       PointOnGeometryLocator.prototype.getClass = function getClass () {
-         return PointOnGeometryLocator
-       };
+           var updateMessage = '';
+           var sawPrivacyVersion = corePreferences('sawPrivacyVersion');
+           var showSplash = !corePreferences('sawSplash');
 
-       var GeometryCollectionIterator = function GeometryCollectionIterator () {
-         this._parent = null;
-         this._atStart = null;
-         this._max = null;
-         this._index = null;
-         this._subcollectionIterator = null;
-         var parent = arguments[0];
-         this._parent = parent;
-         this._atStart = true;
-         this._index = 0;
-         this._max = parent.getNumGeometries();
-       };
-       GeometryCollectionIterator.prototype.next = function next () {
-         if (this._atStart) {
-           this._atStart = false;
-           if (GeometryCollectionIterator.isAtomic(this._parent)) { this._index++; }
-           return this._parent
-         }
-         if (this._subcollectionIterator !== null) {
-           if (this._subcollectionIterator.hasNext()) {
-             return this._subcollectionIterator.next()
-           } else {
-             this._subcollectionIterator = null;
-           }
-         }
-         if (this._index >= this._max) {
-           throw new NoSuchElementException()
-         }
-         var obj = this._parent.getGeometryN(this._index++);
-         if (obj instanceof GeometryCollection) {
-           this._subcollectionIterator = new GeometryCollectionIterator(obj);
-           return this._subcollectionIterator.next()
-         }
-         return obj
-       };
-       GeometryCollectionIterator.prototype.remove = function remove () {
-         throw new Error(this.getClass().getName())
-       };
-       GeometryCollectionIterator.prototype.hasNext = function hasNext () {
-         if (this._atStart) {
-           return true
-         }
-         if (this._subcollectionIterator !== null) {
-           if (this._subcollectionIterator.hasNext()) {
-             return true
+           if (sawPrivacyVersion !== context.privacyVersion) {
+             updateMessage = _t('splash.privacy_update');
+             showSplash = true;
            }
-           this._subcollectionIterator = null;
-         }
-         if (this._index >= this._max) {
-           return false
-         }
-         return true
-       };
-       GeometryCollectionIterator.prototype.interfaces_ = function interfaces_ () {
-         return [Iterator$1]
-       };
-       GeometryCollectionIterator.prototype.getClass = function getClass () {
-         return GeometryCollectionIterator
-       };
-       GeometryCollectionIterator.isAtomic = function isAtomic (geom) {
-         return !(geom instanceof GeometryCollection)
-       };
 
-       var SimplePointInAreaLocator = function SimplePointInAreaLocator () {
-         this._geom = null;
-         var geom = arguments[0];
-         this._geom = geom;
-       };
-       SimplePointInAreaLocator.prototype.locate = function locate (p) {
-         return SimplePointInAreaLocator.locate(p, this._geom)
-       };
-       SimplePointInAreaLocator.prototype.interfaces_ = function interfaces_ () {
-         return [PointOnGeometryLocator]
-       };
-       SimplePointInAreaLocator.prototype.getClass = function getClass () {
-         return SimplePointInAreaLocator
-       };
-       SimplePointInAreaLocator.isPointInRing = function isPointInRing (p, ring) {
-         if (!ring.getEnvelopeInternal().intersects(p)) { return false }
-         return CGAlgorithms.isPointInRing(p, ring.getCoordinates())
-       };
-       SimplePointInAreaLocator.containsPointInPolygon = function containsPointInPolygon (p, poly) {
-         if (poly.isEmpty()) { return false }
-         var shell = poly.getExteriorRing();
-         if (!SimplePointInAreaLocator.isPointInRing(p, shell)) { return false }
-         for (var i = 0; i < poly.getNumInteriorRing(); i++) {
-           var hole = poly.getInteriorRingN(i);
-           if (SimplePointInAreaLocator.isPointInRing(p, hole)) { return false }
-         }
-         return true
-       };
-       SimplePointInAreaLocator.containsPoint = function containsPoint (p, geom) {
-         if (geom instanceof Polygon) {
-           return SimplePointInAreaLocator.containsPointInPolygon(p, geom)
-         } else if (geom instanceof GeometryCollection) {
-           var geomi = new GeometryCollectionIterator(geom);
-           while (geomi.hasNext()) {
-             var g2 = geomi.next();
-             if (g2 !== geom) { if (SimplePointInAreaLocator.containsPoint(p, g2)) { return true } }
-           }
-         }
-         return false
-       };
-       SimplePointInAreaLocator.locate = function locate (p, geom) {
-         if (geom.isEmpty()) { return Location.EXTERIOR }
-         if (SimplePointInAreaLocator.containsPoint(p, geom)) { return Location.INTERIOR }
-         return Location.EXTERIOR
-       };
+           if (!showSplash) return;
+           corePreferences('sawSplash', true);
+           corePreferences('sawPrivacyVersion', context.privacyVersion); // fetch intro graph data now, while user is looking at the splash screen
+
+           _mainFileFetcher.get('intro_graph');
+           var modalSelection = uiModal(selection);
+           modalSelection.select('.modal').attr('class', 'modal-splash modal');
+           var introModal = modalSelection.select('.content').append('div').attr('class', 'fillL');
+           introModal.append('div').attr('class', 'modal-section').append('h3').html(_t.html('splash.welcome'));
+           var modalSection = introModal.append('div').attr('class', 'modal-section');
+           modalSection.append('p').html(_t.html('splash.text', {
+             version: context.version,
+             website: '<a target="_blank" href="http://ideditor.blog/">ideditor.blog</a>',
+             github: '<a target="_blank" href="https://github.com/openstreetmap/iD">github.com</a>'
+           }));
+           modalSection.append('p').html(_t.html('splash.privacy', {
+             updateMessage: updateMessage,
+             privacyLink: '<a target="_blank" href="https://github.com/openstreetmap/iD/blob/release/PRIVACY.md">' + _t('splash.privacy_policy') + '</a>'
+           }));
+           var buttonWrap = introModal.append('div').attr('class', 'modal-actions');
+           var walkthrough = buttonWrap.append('button').attr('class', 'walkthrough').on('click', function () {
+             context.container().call(uiIntro(context));
+             modalSelection.close();
+           });
+           walkthrough.append('svg').attr('class', 'logo logo-walkthrough').append('use').attr('xlink:href', '#iD-logo-walkthrough');
+           walkthrough.append('div').html(_t.html('splash.walkthrough'));
+           var startEditing = buttonWrap.append('button').attr('class', 'start-editing').on('click', modalSelection.close);
+           startEditing.append('svg').attr('class', 'logo logo-features').append('use').attr('xlink:href', '#iD-logo-features');
+           startEditing.append('div').html(_t.html('splash.start'));
+           modalSelection.select('button.close').attr('class', 'hide');
+         };
+       }
 
-       var EdgeEndStar = function EdgeEndStar () {
-         this._edgeMap = new TreeMap();
-         this._edgeList = null;
-         this._ptInAreaLocation = [Location.NONE, Location.NONE];
-       };
-       EdgeEndStar.prototype.getNextCW = function getNextCW (ee) {
-         this.getEdges();
-         var i = this._edgeList.indexOf(ee);
-         var iNextCW = i - 1;
-         if (i === 0) { iNextCW = this._edgeList.size() - 1; }
-         return this._edgeList.get(iNextCW)
-       };
-       EdgeEndStar.prototype.propagateSideLabels = function propagateSideLabels (geomIndex) {
-         var startLoc = Location.NONE;
-         for (var it = this.iterator(); it.hasNext();) {
-           var e = it.next();
-           var label = e.getLabel();
-           if (label.isArea(geomIndex) && label.getLocation(geomIndex, Position.LEFT) !== Location.NONE) { startLoc = label.getLocation(geomIndex, Position.LEFT); }
-         }
-         if (startLoc === Location.NONE) { return null }
-         var currLoc = startLoc;
-         for (var it$1 = this.iterator(); it$1.hasNext();) {
-           var e$1 = it$1.next();
-           var label$1 = e$1.getLabel();
-           if (label$1.getLocation(geomIndex, Position.ON) === Location.NONE) { label$1.setLocation(geomIndex, Position.ON, currLoc); }
-           if (label$1.isArea(geomIndex)) {
-             var leftLoc = label$1.getLocation(geomIndex, Position.LEFT);
-             var rightLoc = label$1.getLocation(geomIndex, Position.RIGHT);
-             if (rightLoc !== Location.NONE) {
-               if (rightLoc !== currLoc) { throw new TopologyException('side location conflict', e$1.getCoordinate()) }
-               if (leftLoc === Location.NONE) {
-                 Assert.shouldNeverReachHere('found single null side (at ' + e$1.getCoordinate() + ')');
-               }
-               currLoc = leftLoc;
-             } else {
-               Assert.isTrue(label$1.getLocation(geomIndex, Position.LEFT) === Location.NONE, 'found single null side');
-               label$1.setLocation(geomIndex, Position.RIGHT, currLoc);
-               label$1.setLocation(geomIndex, Position.LEFT, currLoc);
-             }
-           }
-         }
-       };
-       EdgeEndStar.prototype.getCoordinate = function getCoordinate () {
-         var it = this.iterator();
-         if (!it.hasNext()) { return null }
-         var e = it.next();
-         return e.getCoordinate()
-       };
-       EdgeEndStar.prototype.print = function print (out) {
-         System.out.println('EdgeEndStar:   ' + this.getCoordinate());
-         for (var it = this.iterator(); it.hasNext();) {
-           var e = it.next();
-           e.print(out);
-         }
-       };
-       EdgeEndStar.prototype.isAreaLabelsConsistent = function isAreaLabelsConsistent (geomGraph) {
-         this.computeEdgeEndLabels(geomGraph.getBoundaryNodeRule());
-         return this.checkAreaLabelsConsistent(0)
-       };
-       EdgeEndStar.prototype.checkAreaLabelsConsistent = function checkAreaLabelsConsistent (geomIndex) {
-         var edges = this.getEdges();
-         if (edges.size() <= 0) { return true }
-         var lastEdgeIndex = edges.size() - 1;
-         var startLabel = edges.get(lastEdgeIndex).getLabel();
-         var startLoc = startLabel.getLocation(geomIndex, Position.LEFT);
-         Assert.isTrue(startLoc !== Location.NONE, 'Found unlabelled area edge');
-         var currLoc = startLoc;
-         for (var it = this.iterator(); it.hasNext();) {
-           var e = it.next();
-           var label = e.getLabel();
-           Assert.isTrue(label.isArea(geomIndex), 'Found non-area edge');
-           var leftLoc = label.getLocation(geomIndex, Position.LEFT);
-           var rightLoc = label.getLocation(geomIndex, Position.RIGHT);
-           if (leftLoc === rightLoc) {
-             return false
-           }
-           if (rightLoc !== currLoc) {
-             return false
-           }
-           currLoc = leftLoc;
-         }
-         return true
-       };
-       EdgeEndStar.prototype.findIndex = function findIndex (eSearch) {
-           var this$1 = this;
+       function uiStatus(context) {
+         var osm = context.connection();
+         return function (selection) {
+           if (!osm) return;
 
-         this.iterator();
-         for (var i = 0; i < this._edgeList.size(); i++) {
-           var e = this$1._edgeList.get(i);
-           if (e === eSearch) { return i }
-         }
-         return -1
-       };
-       EdgeEndStar.prototype.iterator = function iterator () {
-         return this.getEdges().iterator()
-       };
-       EdgeEndStar.prototype.getEdges = function getEdges () {
-         if (this._edgeList === null) {
-           this._edgeList = new ArrayList(this._edgeMap.values());
-         }
-         return this._edgeList
-       };
-       EdgeEndStar.prototype.getLocation = function getLocation (geomIndex, p, geom) {
-         if (this._ptInAreaLocation[geomIndex] === Location.NONE) {
-           this._ptInAreaLocation[geomIndex] = SimplePointInAreaLocator.locate(p, geom[geomIndex].getGeometry());
-         }
-         return this._ptInAreaLocation[geomIndex]
-       };
-       EdgeEndStar.prototype.toString = function toString () {
-         var buf = new StringBuffer();
-         buf.append('EdgeEndStar:   ' + this.getCoordinate());
-         buf.append('\n');
-         for (var it = this.iterator(); it.hasNext();) {
-           var e = it.next();
-           buf.append(e);
-           buf.append('\n');
-         }
-         return buf.toString()
-       };
-       EdgeEndStar.prototype.computeEdgeEndLabels = function computeEdgeEndLabels (boundaryNodeRule) {
-         for (var it = this.iterator(); it.hasNext();) {
-           var ee = it.next();
-           ee.computeLabel(boundaryNodeRule);
-         }
-       };
-       EdgeEndStar.prototype.computeLabelling = function computeLabelling (geomGraph) {
-           var this$1 = this;
-
-         this.computeEdgeEndLabels(geomGraph[0].getBoundaryNodeRule());
-         this.propagateSideLabels(0);
-         this.propagateSideLabels(1);
-         var hasDimensionalCollapseEdge = [false, false];
-         for (var it = this.iterator(); it.hasNext();) {
-           var e = it.next();
-           var label = e.getLabel();
-           for (var geomi = 0; geomi < 2; geomi++) {
-             if (label.isLine(geomi) && label.getLocation(geomi) === Location.BOUNDARY) { hasDimensionalCollapseEdge[geomi] = true; }
-           }
-         }
-         for (var it$1 = this.iterator(); it$1.hasNext();) {
-           var e$1 = it$1.next();
-           var label$1 = e$1.getLabel();
-           for (var geomi$1 = 0; geomi$1 < 2; geomi$1++) {
-             if (label$1.isAnyNull(geomi$1)) {
-               var loc = Location.NONE;
-               if (hasDimensionalCollapseEdge[geomi$1]) {
-                 loc = Location.EXTERIOR;
+           function update(err, apiStatus) {
+             selection.html('');
+
+             if (err) {
+               if (apiStatus === 'connectionSwitched') {
+                 // if the connection was just switched, we can't rely on
+                 // the status (we're getting the status of the previous api)
+                 return;
+               } else if (apiStatus === 'rateLimited') {
+                 selection.html(_t.html('osm_api_status.message.rateLimit')).append('a').attr('href', '#').attr('class', 'api-status-login').attr('target', '_blank').call(svgIcon('#iD-icon-out-link', 'inline')).append('span').html(_t.html('login')).on('click.login', function (d3_event) {
+                   d3_event.preventDefault();
+                   osm.authenticate();
+                 });
                } else {
-                 var p = e$1.getCoordinate();
-                 loc = this$1.getLocation(geomi$1, p, geomGraph);
+                 // don't allow retrying too rapidly
+                 var throttledRetry = throttle(function () {
+                   // try loading the visible tiles
+                   context.loadTiles(context.projection); // manually reload the status too in case all visible tiles were already loaded
+
+                   osm.reloadApiStatus();
+                 }, 2000); // eslint-disable-next-line no-warning-comments
+                 // TODO: nice messages for different error types
+
+
+                 selection.html(_t.html('osm_api_status.message.error') + ' ').append('a').attr('href', '#') // let the user manually retry their connection directly
+                 .html(_t.html('osm_api_status.retry')).on('click.retry', function (d3_event) {
+                   d3_event.preventDefault();
+                   throttledRetry();
+                 });
                }
-               label$1.setAllLocationsIfNull(geomi$1, loc);
+             } else if (apiStatus === 'readonly') {
+               selection.html(_t.html('osm_api_status.message.readonly'));
+             } else if (apiStatus === 'offline') {
+               selection.html(_t.html('osm_api_status.message.offline'));
              }
-           }
-         }
-       };
-       EdgeEndStar.prototype.getDegree = function getDegree () {
-         return this._edgeMap.size()
-       };
-       EdgeEndStar.prototype.insertEdgeEnd = function insertEdgeEnd (e, obj) {
-         this._edgeMap.put(e, obj);
-         this._edgeList = null;
-       };
-       EdgeEndStar.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       EdgeEndStar.prototype.getClass = function getClass () {
-         return EdgeEndStar
-       };
 
-       var DirectedEdgeStar = (function (EdgeEndStar$$1) {
-         function DirectedEdgeStar () {
-           EdgeEndStar$$1.call(this);
-           this._resultAreaEdgeList = null;
-           this._label = null;
-           this._SCANNING_FOR_INCOMING = 1;
-           this._LINKING_TO_OUTGOING = 2;
-         }
-
-         if ( EdgeEndStar$$1 ) DirectedEdgeStar.__proto__ = EdgeEndStar$$1;
-         DirectedEdgeStar.prototype = Object.create( EdgeEndStar$$1 && EdgeEndStar$$1.prototype );
-         DirectedEdgeStar.prototype.constructor = DirectedEdgeStar;
-         DirectedEdgeStar.prototype.linkResultDirectedEdges = function linkResultDirectedEdges () {
-           var this$1 = this;
-
-           this.getResultAreaEdges();
-           var firstOut = null;
-           var incoming = null;
-           var state = this._SCANNING_FOR_INCOMING;
-           for (var i = 0; i < this._resultAreaEdgeList.size(); i++) {
-             var nextOut = this$1._resultAreaEdgeList.get(i);
-             var nextIn = nextOut.getSym();
-             if (!nextOut.getLabel().isArea()) { continue }
-             if (firstOut === null && nextOut.isInResult()) { firstOut = nextOut; }
-             switch (state) {
-               case this$1._SCANNING_FOR_INCOMING:
-                 if (!nextIn.isInResult()) { continue }
-                 incoming = nextIn;
-                 state = this$1._LINKING_TO_OUTGOING;
-                 break
-               case this$1._LINKING_TO_OUTGOING:
-                 if (!nextOut.isInResult()) { continue }
-                 incoming.setNext(nextOut);
-                 state = this$1._SCANNING_FOR_INCOMING;
-                 break
-             }
-           }
-           if (state === this._LINKING_TO_OUTGOING) {
-             if (firstOut === null) { throw new TopologyException('no outgoing dirEdge found', this.getCoordinate()) }
-             Assert.isTrue(firstOut.isInResult(), 'unable to link last incoming dirEdge');
-             incoming.setNext(firstOut);
-           }
-         };
-         DirectedEdgeStar.prototype.insert = function insert (ee) {
-           var de = ee;
-           this.insertEdgeEnd(de, de);
-         };
-         DirectedEdgeStar.prototype.getRightmostEdge = function getRightmostEdge () {
-           var edges = this.getEdges();
-           var size = edges.size();
-           if (size < 1) { return null }
-           var de0 = edges.get(0);
-           if (size === 1) { return de0 }
-           var deLast = edges.get(size - 1);
-           var quad0 = de0.getQuadrant();
-           var quad1 = deLast.getQuadrant();
-           if (Quadrant.isNorthern(quad0) && Quadrant.isNorthern(quad1)) { return de0; } else if (!Quadrant.isNorthern(quad0) && !Quadrant.isNorthern(quad1)) { return deLast; } else {
-             // const nonHorizontalEdge = null
-             if (de0.getDy() !== 0) { return de0; } else if (deLast.getDy() !== 0) { return deLast }
-           }
-           Assert.shouldNeverReachHere('found two horizontal edges incident on node');
-           return null
-         };
-         DirectedEdgeStar.prototype.print = function print (out) {
-           System.out.println('DirectedEdgeStar: ' + this.getCoordinate());
-           for (var it = this.iterator(); it.hasNext();) {
-             var de = it.next();
-             out.print('out ');
-             de.print(out);
-             out.println();
-             out.print('in ');
-             de.getSym().print(out);
-             out.println();
-           }
-         };
-         DirectedEdgeStar.prototype.getResultAreaEdges = function getResultAreaEdges () {
-           var this$1 = this;
-
-           if (this._resultAreaEdgeList !== null) { return this._resultAreaEdgeList }
-           this._resultAreaEdgeList = new ArrayList();
-           for (var it = this.iterator(); it.hasNext();) {
-             var de = it.next();
-             if (de.isInResult() || de.getSym().isInResult()) { this$1._resultAreaEdgeList.add(de); }
-           }
-           return this._resultAreaEdgeList
-         };
-         DirectedEdgeStar.prototype.updateLabelling = function updateLabelling (nodeLabel) {
-           for (var it = this.iterator(); it.hasNext();) {
-             var de = it.next();
-             var label = de.getLabel();
-             label.setAllLocationsIfNull(0, nodeLabel.getLocation(0));
-             label.setAllLocationsIfNull(1, nodeLabel.getLocation(1));
-           }
-         };
-         DirectedEdgeStar.prototype.linkAllDirectedEdges = function linkAllDirectedEdges () {
-           var this$1 = this;
-
-           this.getEdges();
-           var prevOut = null;
-           var firstIn = null;
-           for (var i = this._edgeList.size() - 1; i >= 0; i--) {
-             var nextOut = this$1._edgeList.get(i);
-             var nextIn = nextOut.getSym();
-             if (firstIn === null) { firstIn = nextIn; }
-             if (prevOut !== null) { nextIn.setNext(prevOut); }
-             prevOut = nextOut;
-           }
-           firstIn.setNext(prevOut);
-         };
-         DirectedEdgeStar.prototype.computeDepths = function computeDepths () {
-           var this$1 = this;
-
-           if (arguments.length === 1) {
-             var de = arguments[0];
-             var edgeIndex = this.findIndex(de);
-             // const label = de.getLabel()
-             var startDepth = de.getDepth(Position.LEFT);
-             var targetLastDepth = de.getDepth(Position.RIGHT);
-             var nextDepth = this.computeDepths(edgeIndex + 1, this._edgeList.size(), startDepth);
-             var lastDepth = this.computeDepths(0, edgeIndex, nextDepth);
-             if (lastDepth !== targetLastDepth) { throw new TopologyException('depth mismatch at ' + de.getCoordinate()) }
-           } else if (arguments.length === 3) {
-             var startIndex = arguments[0];
-             var endIndex = arguments[1];
-             var startDepth$1 = arguments[2];
-             var currDepth = startDepth$1;
-             for (var i = startIndex; i < endIndex; i++) {
-               var nextDe = this$1._edgeList.get(i);
-               // const label = nextDe.getLabel()
-               nextDe.setEdgeDepths(Position.RIGHT, currDepth);
-               currDepth = nextDe.getDepth(Position.LEFT);
-             }
-             return currDepth
-           }
-         };
-         DirectedEdgeStar.prototype.mergeSymLabels = function mergeSymLabels () {
-           for (var it = this.iterator(); it.hasNext();) {
-             var de = it.next();
-             var label = de.getLabel();
-             label.merge(de.getSym().getLabel());
-           }
-         };
-         DirectedEdgeStar.prototype.linkMinimalDirectedEdges = function linkMinimalDirectedEdges (er) {
-           var this$1 = this;
-
-           var firstOut = null;
-           var incoming = null;
-           var state = this._SCANNING_FOR_INCOMING;
-           for (var i = this._resultAreaEdgeList.size() - 1; i >= 0; i--) {
-             var nextOut = this$1._resultAreaEdgeList.get(i);
-             var nextIn = nextOut.getSym();
-             if (firstOut === null && nextOut.getEdgeRing() === er) { firstOut = nextOut; }
-             switch (state) {
-               case this$1._SCANNING_FOR_INCOMING:
-                 if (nextIn.getEdgeRing() !== er) { continue }
-                 incoming = nextIn;
-                 state = this$1._LINKING_TO_OUTGOING;
-                 break
-               case this$1._LINKING_TO_OUTGOING:
-                 if (nextOut.getEdgeRing() !== er) { continue }
-                 incoming.setNextMin(nextOut);
-                 state = this$1._SCANNING_FOR_INCOMING;
-                 break
-             }
-           }
-           if (state === this._LINKING_TO_OUTGOING) {
-             Assert.isTrue(firstOut !== null, 'found null for first outgoing dirEdge');
-             Assert.isTrue(firstOut.getEdgeRing() === er, 'unable to link last incoming dirEdge');
-             incoming.setNextMin(firstOut);
-           }
-         };
-         DirectedEdgeStar.prototype.getOutgoingDegree = function getOutgoingDegree () {
-           if (arguments.length === 0) {
-             var degree = 0;
-             for (var it = this.iterator(); it.hasNext();) {
-               var de = it.next();
-               if (de.isInResult()) { degree++; }
-             }
-             return degree
-           } else if (arguments.length === 1) {
-             var er = arguments[0];
-             var degree$1 = 0;
-             for (var it$1 = this.iterator(); it$1.hasNext();) {
-               var de$1 = it$1.next();
-               if (de$1.getEdgeRing() === er) { degree$1++; }
-             }
-             return degree$1
-           }
-         };
-         DirectedEdgeStar.prototype.getLabel = function getLabel () {
-           return this._label
-         };
-         DirectedEdgeStar.prototype.findCoveredLineEdges = function findCoveredLineEdges () {
-           var startLoc = Location.NONE;
-           for (var it = this.iterator(); it.hasNext();) {
-             var nextOut = it.next();
-             var nextIn = nextOut.getSym();
-             if (!nextOut.isLineEdge()) {
-               if (nextOut.isInResult()) {
-                 startLoc = Location.INTERIOR;
-                 break
-               }
-               if (nextIn.isInResult()) {
-                 startLoc = Location.EXTERIOR;
-                 break
-               }
-             }
-           }
-           if (startLoc === Location.NONE) { return null }
-           var currLoc = startLoc;
-           for (var it$1 = this.iterator(); it$1.hasNext();) {
-             var nextOut$1 = it$1.next();
-             var nextIn$1 = nextOut$1.getSym();
-             if (nextOut$1.isLineEdge()) {
-               nextOut$1.getEdge().setCovered(currLoc === Location.INTERIOR);
-             } else {
-               if (nextOut$1.isInResult()) { currLoc = Location.EXTERIOR; }
-               if (nextIn$1.isInResult()) { currLoc = Location.INTERIOR; }
-             }
+             selection.attr('class', 'api-status ' + (err ? 'error' : apiStatus));
            }
+
+           osm.on('apiStatusChange.uiStatus', update); // reload the status periodically regardless of other factors
+
+           window.setInterval(function () {
+             osm.reloadApiStatus();
+           }, 90000); // load the initial status in case no OSM data was loaded yet
+
+           osm.reloadApiStatus();
          };
-         DirectedEdgeStar.prototype.computeLabelling = function computeLabelling (geom) {
-           var this$1 = this;
+       }
 
-           EdgeEndStar$$1.prototype.computeLabelling.call(this, geom);
-           this._label = new Label(Location.NONE);
-           for (var it = this.iterator(); it.hasNext();) {
-             var ee = it.next();
-             var e = ee.getEdge();
-             var eLabel = e.getLabel();
-             for (var i = 0; i < 2; i++) {
-               var eLoc = eLabel.getLocation(i);
-               if (eLoc === Location.INTERIOR || eLoc === Location.BOUNDARY) { this$1._label.setLocation(i, Location.INTERIOR); }
-             }
-           }
+       function modeDrawArea(context, wayID, startGraph, button) {
+         var mode = {
+           button: button,
+           id: 'draw-area'
          };
-         DirectedEdgeStar.prototype.interfaces_ = function interfaces_ () {
-           return []
+         var behavior = behaviorDrawWay(context, wayID, mode, startGraph).on('rejectedSelfIntersection.modeDrawArea', function () {
+           context.ui().flash.iconName('#iD-icon-no').label(_t('self_intersection.error.areas'))();
+         });
+         mode.wayID = wayID;
+
+         mode.enter = function () {
+           context.install(behavior);
          };
-         DirectedEdgeStar.prototype.getClass = function getClass () {
-           return DirectedEdgeStar
+
+         mode.exit = function () {
+           context.uninstall(behavior);
          };
 
-         return DirectedEdgeStar;
-       }(EdgeEndStar));
+         mode.selectedIDs = function () {
+           return [wayID];
+         };
 
-       var OverlayNodeFactory = (function (NodeFactory$$1) {
-         function OverlayNodeFactory () {
-           NodeFactory$$1.apply(this, arguments);
-         }
+         mode.activeID = function () {
+           return behavior && behavior.activeID() || [];
+         };
 
-         if ( NodeFactory$$1 ) OverlayNodeFactory.__proto__ = NodeFactory$$1;
-         OverlayNodeFactory.prototype = Object.create( NodeFactory$$1 && NodeFactory$$1.prototype );
-         OverlayNodeFactory.prototype.constructor = OverlayNodeFactory;
+         return mode;
+       }
 
-         OverlayNodeFactory.prototype.createNode = function createNode (coord) {
-           return new Node$1(coord, new DirectedEdgeStar())
-         };
-         OverlayNodeFactory.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         OverlayNodeFactory.prototype.getClass = function getClass () {
-           return OverlayNodeFactory
+       function modeAddArea(context, mode) {
+         mode.id = 'add-area';
+         var behavior = behaviorAddWay(context).on('start', start).on('startFromWay', startFromWay).on('startFromNode', startFromNode);
+         var defaultTags = {
+           area: 'yes'
          };
+         if (mode.preset) defaultTags = mode.preset.setTags(defaultTags, 'area');
 
-         return OverlayNodeFactory;
-       }(NodeFactory));
-
-       var OrientedCoordinateArray = function OrientedCoordinateArray () {
-         this._pts = null;
-         this._orientation = null;
-         var pts = arguments[0];
-         this._pts = pts;
-         this._orientation = OrientedCoordinateArray.orientation(pts);
-       };
-       OrientedCoordinateArray.prototype.compareTo = function compareTo (o1) {
-         var oca = o1;
-         var comp = OrientedCoordinateArray.compareOriented(this._pts, this._orientation, oca._pts, oca._orientation);
-         return comp
-       };
-       OrientedCoordinateArray.prototype.interfaces_ = function interfaces_ () {
-         return [Comparable]
-       };
-       OrientedCoordinateArray.prototype.getClass = function getClass () {
-         return OrientedCoordinateArray
-       };
-       OrientedCoordinateArray.orientation = function orientation (pts) {
-         return CoordinateArrays.increasingDirection(pts) === 1
-       };
-       OrientedCoordinateArray.compareOriented = function compareOriented (pts1, orientation1, pts2, orientation2) {
-         var dir1 = orientation1 ? 1 : -1;
-         var dir2 = orientation2 ? 1 : -1;
-         var limit1 = orientation1 ? pts1.length : -1;
-         var limit2 = orientation2 ? pts2.length : -1;
-         var i1 = orientation1 ? 0 : pts1.length - 1;
-         var i2 = orientation2 ? 0 : pts2.length - 1;
-         // const comp = 0
-         while (true) {
-           var compPt = pts1[i1].compareTo(pts2[i2]);
-           if (compPt !== 0) { return compPt }
-           i1 += dir1;
-           i2 += dir2;
-           var done1 = i1 === limit1;
-           var done2 = i2 === limit2;
-           if (done1 && !done2) { return -1 }
-           if (!done1 && done2) { return 1 }
-           if (done1 && done2) { return 0 }
+         function actionClose(wayId) {
+           return function (graph) {
+             return graph.replace(graph.entity(wayId).close());
+           };
          }
-       };
-
-       var EdgeList = function EdgeList () {
-         this._edges = new ArrayList();
-         this._ocaMap = new TreeMap();
-       };
-       EdgeList.prototype.print = function print (out) {
-           var this$1 = this;
-
-         out.print('MULTILINESTRING ( ');
-         for (var j = 0; j < this._edges.size(); j++) {
-           var e = this$1._edges.get(j);
-           if (j > 0) { out.print(','); }
-           out.print('(');
-           var pts = e.getCoordinates();
-           for (var i = 0; i < pts.length; i++) {
-             if (i > 0) { out.print(','); }
-             out.print(pts[i].x + ' ' + pts[i].y);
-           }
-           out.println(')');
-         }
-         out.print(')  ');
-       };
-       EdgeList.prototype.addAll = function addAll (edgeColl) {
-           var this$1 = this;
 
-         for (var i = edgeColl.iterator(); i.hasNext();) {
-           this$1.add(i.next());
+         function start(loc) {
+           var startGraph = context.graph();
+           var node = osmNode({
+             loc: loc
+           });
+           var way = osmWay({
+             tags: defaultTags
+           });
+           context.perform(actionAddEntity(node), actionAddEntity(way), actionAddVertex(way.id, node.id), actionClose(way.id));
+           context.enter(modeDrawArea(context, way.id, startGraph, mode.button));
          }
-       };
-       EdgeList.prototype.findEdgeIndex = function findEdgeIndex (e) {
-           var this$1 = this;
 
-         for (var i = 0; i < this._edges.size(); i++) {
-           if (this$1._edges.get(i).equals(e)) { return i }
+         function startFromWay(loc, edge) {
+           var startGraph = context.graph();
+           var node = osmNode({
+             loc: loc
+           });
+           var way = osmWay({
+             tags: defaultTags
+           });
+           context.perform(actionAddEntity(node), actionAddEntity(way), actionAddVertex(way.id, node.id), actionClose(way.id), actionAddMidpoint({
+             loc: loc,
+             edge: edge
+           }, node));
+           context.enter(modeDrawArea(context, way.id, startGraph, mode.button));
          }
-         return -1
-       };
-       EdgeList.prototype.iterator = function iterator () {
-         return this._edges.iterator()
-       };
-       EdgeList.prototype.getEdges = function getEdges () {
-         return this._edges
-       };
-       EdgeList.prototype.get = function get (i) {
-         return this._edges.get(i)
-       };
-       EdgeList.prototype.findEqualEdge = function findEqualEdge (e) {
-         var oca = new OrientedCoordinateArray(e.getCoordinates());
-         var matchEdge = this._ocaMap.get(oca);
-         return matchEdge
-       };
-       EdgeList.prototype.add = function add (e) {
-         this._edges.add(e);
-         var oca = new OrientedCoordinateArray(e.getCoordinates());
-         this._ocaMap.put(oca, e);
-       };
-       EdgeList.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       EdgeList.prototype.getClass = function getClass () {
-         return EdgeList
-       };
 
-       var SegmentIntersector = function SegmentIntersector () {};
+         function startFromNode(node) {
+           var startGraph = context.graph();
+           var way = osmWay({
+             tags: defaultTags
+           });
+           context.perform(actionAddEntity(way), actionAddVertex(way.id, node.id), actionClose(way.id));
+           context.enter(modeDrawArea(context, way.id, startGraph, mode.button));
+         }
 
-       SegmentIntersector.prototype.processIntersections = function processIntersections (e0, segIndex0, e1, segIndex1) {};
-       SegmentIntersector.prototype.isDone = function isDone () {};
-       SegmentIntersector.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       SegmentIntersector.prototype.getClass = function getClass () {
-         return SegmentIntersector
-       };
+         mode.enter = function () {
+           context.install(behavior);
+         };
 
-       var IntersectionAdder = function IntersectionAdder () {
-         this._hasIntersection = false;
-         this._hasProper = false;
-         this._hasProperInterior = false;
-         this._hasInterior = false;
-         this._properIntersectionPoint = null;
-         this._li = null;
-         this._isSelfIntersection = null;
-         this.numIntersections = 0;
-         this.numInteriorIntersections = 0;
-         this.numProperIntersections = 0;
-         this.numTests = 0;
-         var li = arguments[0];
-         this._li = li;
-       };
-       IntersectionAdder.prototype.isTrivialIntersection = function isTrivialIntersection (e0, segIndex0, e1, segIndex1) {
-         if (e0 === e1) {
-           if (this._li.getIntersectionNum() === 1) {
-             if (IntersectionAdder.isAdjacentSegments(segIndex0, segIndex1)) { return true }
-             if (e0.isClosed()) {
-               var maxSegIndex = e0.size() - 1;
-               if ((segIndex0 === 0 && segIndex1 === maxSegIndex) ||
-                   (segIndex1 === 0 && segIndex0 === maxSegIndex)) {
-                 return true
-               }
-             }
-           }
-         }
-         return false
-       };
-       IntersectionAdder.prototype.getProperIntersectionPoint = function getProperIntersectionPoint () {
-         return this._properIntersectionPoint
-       };
-       IntersectionAdder.prototype.hasProperInteriorIntersection = function hasProperInteriorIntersection () {
-         return this._hasProperInterior
-       };
-       IntersectionAdder.prototype.getLineIntersector = function getLineIntersector () {
-         return this._li
-       };
-       IntersectionAdder.prototype.hasProperIntersection = function hasProperIntersection () {
-         return this._hasProper
-       };
-       IntersectionAdder.prototype.processIntersections = function processIntersections (e0, segIndex0, e1, segIndex1) {
-         if (e0 === e1 && segIndex0 === segIndex1) { return null }
-         this.numTests++;
-         var p00 = e0.getCoordinates()[segIndex0];
-         var p01 = e0.getCoordinates()[segIndex0 + 1];
-         var p10 = e1.getCoordinates()[segIndex1];
-         var p11 = e1.getCoordinates()[segIndex1 + 1];
-         this._li.computeIntersection(p00, p01, p10, p11);
-         if (this._li.hasIntersection()) {
-           this.numIntersections++;
-           if (this._li.isInteriorIntersection()) {
-             this.numInteriorIntersections++;
-             this._hasInterior = true;
-           }
-           if (!this.isTrivialIntersection(e0, segIndex0, e1, segIndex1)) {
-             this._hasIntersection = true;
-             e0.addIntersections(this._li, segIndex0, 0);
-             e1.addIntersections(this._li, segIndex1, 1);
-             if (this._li.isProper()) {
-               this.numProperIntersections++;
-               this._hasProper = true;
-               this._hasProperInterior = true;
-             }
-           }
-         }
-       };
-       IntersectionAdder.prototype.hasIntersection = function hasIntersection () {
-         return this._hasIntersection
-       };
-       IntersectionAdder.prototype.isDone = function isDone () {
-         return false
-       };
-       IntersectionAdder.prototype.hasInteriorIntersection = function hasInteriorIntersection () {
-         return this._hasInterior
-       };
-       IntersectionAdder.prototype.interfaces_ = function interfaces_ () {
-         return [SegmentIntersector]
-       };
-       IntersectionAdder.prototype.getClass = function getClass () {
-         return IntersectionAdder
-       };
-       IntersectionAdder.isAdjacentSegments = function isAdjacentSegments (i1, i2) {
-         return Math.abs(i1 - i2) === 1
-       };
+         mode.exit = function () {
+           context.uninstall(behavior);
+         };
 
-       var EdgeIntersection = function EdgeIntersection () {
-         this.coord = null;
-         this.segmentIndex = null;
-         this.dist = null;
-         var coord = arguments[0];
-         var segmentIndex = arguments[1];
-         var dist = arguments[2];
-         this.coord = new Coordinate(coord);
-         this.segmentIndex = segmentIndex;
-         this.dist = dist;
-       };
-       EdgeIntersection.prototype.getSegmentIndex = function getSegmentIndex () {
-         return this.segmentIndex
-       };
-       EdgeIntersection.prototype.getCoordinate = function getCoordinate () {
-         return this.coord
-       };
-       EdgeIntersection.prototype.print = function print (out) {
-         out.print(this.coord);
-         out.print(' seg # = ' + this.segmentIndex);
-         out.println(' dist = ' + this.dist);
-       };
-       EdgeIntersection.prototype.compareTo = function compareTo (obj) {
-         var other = obj;
-         return this.compare(other.segmentIndex, other.dist)
-       };
-       EdgeIntersection.prototype.isEndPoint = function isEndPoint (maxSegmentIndex) {
-         if (this.segmentIndex === 0 && this.dist === 0.0) { return true }
-         if (this.segmentIndex === maxSegmentIndex) { return true }
-         return false
-       };
-       EdgeIntersection.prototype.toString = function toString () {
-         return this.coord + ' seg # = ' + this.segmentIndex + ' dist = ' + this.dist
-       };
-       EdgeIntersection.prototype.getDistance = function getDistance () {
-         return this.dist
-       };
-       EdgeIntersection.prototype.compare = function compare (segmentIndex, dist) {
-         if (this.segmentIndex < segmentIndex) { return -1 }
-         if (this.segmentIndex > segmentIndex) { return 1 }
-         if (this.dist < dist) { return -1 }
-         if (this.dist > dist) { return 1 }
-         return 0
-       };
-       EdgeIntersection.prototype.interfaces_ = function interfaces_ () {
-         return [Comparable]
-       };
-       EdgeIntersection.prototype.getClass = function getClass () {
-         return EdgeIntersection
-       };
+         return mode;
+       }
 
-       var EdgeIntersectionList = function EdgeIntersectionList () {
-         this._nodeMap = new TreeMap();
-         this.edge = null;
-         var edge = arguments[0];
-         this.edge = edge;
-       };
-       EdgeIntersectionList.prototype.print = function print (out) {
-         out.println('Intersections:');
-         for (var it = this.iterator(); it.hasNext();) {
-           var ei = it.next();
-           ei.print(out);
+       function modeAddLine(context, mode) {
+         mode.id = 'add-line';
+         var behavior = behaviorAddWay(context).on('start', start).on('startFromWay', startFromWay).on('startFromNode', startFromNode);
+         var defaultTags = {};
+         if (mode.preset) defaultTags = mode.preset.setTags(defaultTags, 'line');
+
+         function start(loc) {
+           var startGraph = context.graph();
+           var node = osmNode({
+             loc: loc
+           });
+           var way = osmWay({
+             tags: defaultTags
+           });
+           context.perform(actionAddEntity(node), actionAddEntity(way), actionAddVertex(way.id, node.id));
+           context.enter(modeDrawLine(context, way.id, startGraph, mode.button));
          }
-       };
-       EdgeIntersectionList.prototype.iterator = function iterator () {
-         return this._nodeMap.values().iterator()
-       };
-       EdgeIntersectionList.prototype.addSplitEdges = function addSplitEdges (edgeList) {
-           var this$1 = this;
-
-         this.addEndpoints();
-         var it = this.iterator();
-         var eiPrev = it.next();
-         while (it.hasNext()) {
-           var ei = it.next();
-           var newEdge = this$1.createSplitEdge(eiPrev, ei);
-           edgeList.add(newEdge);
-           eiPrev = ei;
+
+         function startFromWay(loc, edge) {
+           var startGraph = context.graph();
+           var node = osmNode({
+             loc: loc
+           });
+           var way = osmWay({
+             tags: defaultTags
+           });
+           context.perform(actionAddEntity(node), actionAddEntity(way), actionAddVertex(way.id, node.id), actionAddMidpoint({
+             loc: loc,
+             edge: edge
+           }, node));
+           context.enter(modeDrawLine(context, way.id, startGraph, mode.button));
          }
-       };
-       EdgeIntersectionList.prototype.addEndpoints = function addEndpoints () {
-         var maxSegIndex = this.edge.pts.length - 1;
-         this.add(this.edge.pts[0], 0, 0.0);
-         this.add(this.edge.pts[maxSegIndex], maxSegIndex, 0.0);
-       };
-       EdgeIntersectionList.prototype.createSplitEdge = function createSplitEdge (ei0, ei1) {
-           var this$1 = this;
-
-         var npts = ei1.segmentIndex - ei0.segmentIndex + 2;
-         var lastSegStartPt = this.edge.pts[ei1.segmentIndex];
-         var useIntPt1 = ei1.dist > 0.0 || !ei1.coord.equals2D(lastSegStartPt);
-         if (!useIntPt1) {
-           npts--;
-         }
-         var pts = new Array(npts).fill(null);
-         var ipt = 0;
-         pts[ipt++] = new Coordinate(ei0.coord);
-         for (var i = ei0.segmentIndex + 1; i <= ei1.segmentIndex; i++) {
-           pts[ipt++] = this$1.edge.pts[i];
-         }
-         if (useIntPt1) { pts[ipt] = ei1.coord; }
-         return new Edge(pts, new Label(this.edge._label))
-       };
-       EdgeIntersectionList.prototype.add = function add (intPt, segmentIndex, dist) {
-         var eiNew = new EdgeIntersection(intPt, segmentIndex, dist);
-         var ei = this._nodeMap.get(eiNew);
-         if (ei !== null) {
-           return ei
-         }
-         this._nodeMap.put(eiNew, eiNew);
-         return eiNew
-       };
-       EdgeIntersectionList.prototype.isIntersection = function isIntersection (pt) {
-         for (var it = this.iterator(); it.hasNext();) {
-           var ei = it.next();
-           if (ei.coord.equals(pt)) { return true }
+
+         function startFromNode(node) {
+           var startGraph = context.graph();
+           var way = osmWay({
+             tags: defaultTags
+           });
+           context.perform(actionAddEntity(way), actionAddVertex(way.id, node.id));
+           context.enter(modeDrawLine(context, way.id, startGraph, mode.button));
          }
-         return false
-       };
-       EdgeIntersectionList.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       EdgeIntersectionList.prototype.getClass = function getClass () {
-         return EdgeIntersectionList
-       };
 
-       var MonotoneChainIndexer = function MonotoneChainIndexer () {};
+         mode.enter = function () {
+           context.install(behavior);
+         };
 
-       MonotoneChainIndexer.prototype.getChainStartIndices = function getChainStartIndices (pts) {
-           var this$1 = this;
+         mode.exit = function () {
+           context.uninstall(behavior);
+         };
 
-         var start = 0;
-         var startIndexList = new ArrayList();
-         startIndexList.add(new Integer(start));
-         do {
-           var last = this$1.findChainEnd(pts, start);
-           startIndexList.add(new Integer(last));
-           start = last;
-         } while (start < pts.length - 1)
-         var startIndex = MonotoneChainIndexer.toIntArray(startIndexList);
-         return startIndex
-       };
-       MonotoneChainIndexer.prototype.findChainEnd = function findChainEnd (pts, start) {
-         var chainQuad = Quadrant.quadrant(pts[start], pts[start + 1]);
-         var last = start + 1;
-         while (last < pts.length) {
-           var quad = Quadrant.quadrant(pts[last - 1], pts[last]);
-           if (quad !== chainQuad) { break }
-           last++;
-         }
-         return last - 1
-       };
-       MonotoneChainIndexer.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       MonotoneChainIndexer.prototype.getClass = function getClass () {
-         return MonotoneChainIndexer
-       };
-       MonotoneChainIndexer.toIntArray = function toIntArray (list) {
-         var array = new Array(list.size()).fill(null);
-         for (var i = 0; i < array.length; i++) {
-           array[i] = list.get(i).intValue();
-         }
-         return array
-       };
+         return mode;
+       }
 
-       var MonotoneChainEdge = function MonotoneChainEdge () {
-         this.e = null;
-         this.pts = null;
-         this.startIndex = null;
-         this.env1 = new Envelope();
-         this.env2 = new Envelope();
-         var e = arguments[0];
-         this.e = e;
-         this.pts = e.getCoordinates();
-         var mcb = new MonotoneChainIndexer();
-         this.startIndex = mcb.getChainStartIndices(this.pts);
-       };
-       MonotoneChainEdge.prototype.getCoordinates = function getCoordinates () {
-         return this.pts
-       };
-       MonotoneChainEdge.prototype.getMaxX = function getMaxX (chainIndex) {
-         var x1 = this.pts[this.startIndex[chainIndex]].x;
-         var x2 = this.pts[this.startIndex[chainIndex + 1]].x;
-         return x1 > x2 ? x1 : x2
-       };
-       MonotoneChainEdge.prototype.getMinX = function getMinX (chainIndex) {
-         var x1 = this.pts[this.startIndex[chainIndex]].x;
-         var x2 = this.pts[this.startIndex[chainIndex + 1]].x;
-         return x1 < x2 ? x1 : x2
-       };
-       MonotoneChainEdge.prototype.computeIntersectsForChain = function computeIntersectsForChain () {
-         if (arguments.length === 4) {
-           var chainIndex0 = arguments[0];
-           var mce = arguments[1];
-           var chainIndex1 = arguments[2];
-           var si = arguments[3];
-           this.computeIntersectsForChain(this.startIndex[chainIndex0], this.startIndex[chainIndex0 + 1], mce, mce.startIndex[chainIndex1], mce.startIndex[chainIndex1 + 1], si);
-         } else if (arguments.length === 6) {
-           var start0 = arguments[0];
-           var end0 = arguments[1];
-           var mce$1 = arguments[2];
-           var start1 = arguments[3];
-           var end1 = arguments[4];
-           var ei = arguments[5];
-           var p00 = this.pts[start0];
-           var p01 = this.pts[end0];
-           var p10 = mce$1.pts[start1];
-           var p11 = mce$1.pts[end1];
-           if (end0 - start0 === 1 && end1 - start1 === 1) {
-             ei.addIntersections(this.e, start0, mce$1.e, start1);
-             return null
-           }
-           this.env1.init(p00, p01);
-           this.env2.init(p10, p11);
-           if (!this.env1.intersects(this.env2)) { return null }
-           var mid0 = Math.trunc((start0 + end0) / 2);
-           var mid1 = Math.trunc((start1 + end1) / 2);
-           if (start0 < mid0) {
-             if (start1 < mid1) { this.computeIntersectsForChain(start0, mid0, mce$1, start1, mid1, ei); }
-             if (mid1 < end1) { this.computeIntersectsForChain(start0, mid0, mce$1, mid1, end1, ei); }
-           }
-           if (mid0 < end0) {
-             if (start1 < mid1) { this.computeIntersectsForChain(mid0, end0, mce$1, start1, mid1, ei); }
-             if (mid1 < end1) { this.computeIntersectsForChain(mid0, end0, mce$1, mid1, end1, ei); }
-           }
+       function modeAddPoint(context, mode) {
+         mode.id = 'add-point';
+         var behavior = behaviorDraw(context).on('click', add).on('clickWay', addWay).on('clickNode', addNode).on('cancel', cancel).on('finish', cancel);
+         var defaultTags = {};
+         if (mode.preset) defaultTags = mode.preset.setTags(defaultTags, 'point');
+
+         function add(loc) {
+           var node = osmNode({
+             loc: loc,
+             tags: defaultTags
+           });
+           context.perform(actionAddEntity(node), _t('operations.add.annotation.point'));
+           enterSelectMode(node);
          }
-       };
-       MonotoneChainEdge.prototype.getStartIndexes = function getStartIndexes () {
-         return this.startIndex
-       };
-       MonotoneChainEdge.prototype.computeIntersects = function computeIntersects (mce, si) {
-           var this$1 = this;
 
-         for (var i = 0; i < this.startIndex.length - 1; i++) {
-           for (var j = 0; j < mce.startIndex.length - 1; j++) {
-             this$1.computeIntersectsForChain(i, mce, j, si);
-           }
+         function addWay(loc, edge) {
+           var node = osmNode({
+             tags: defaultTags
+           });
+           context.perform(actionAddMidpoint({
+             loc: loc,
+             edge: edge
+           }, node), _t('operations.add.annotation.vertex'));
+           enterSelectMode(node);
          }
-       };
-       MonotoneChainEdge.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       MonotoneChainEdge.prototype.getClass = function getClass () {
-         return MonotoneChainEdge
-       };
 
-       var Depth = function Depth () {
-         var this$1 = this;
+         function enterSelectMode(node) {
+           context.enter(modeSelect(context, [node.id]).newFeature(true));
+         }
 
-         this._depth = Array(2).fill().map(function () { return Array(3); });
-         for (var i = 0; i < 2; i++) {
-           for (var j = 0; j < 3; j++) {
-             this$1._depth[i][j] = Depth.NULL_VALUE;
+         function addNode(node) {
+           if (Object.keys(defaultTags).length === 0) {
+             enterSelectMode(node);
+             return;
            }
-         }
-       };
 
-       var staticAccessors$31 = { NULL_VALUE: { configurable: true } };
-       Depth.prototype.getDepth = function getDepth (geomIndex, posIndex) {
-         return this._depth[geomIndex][posIndex]
-       };
-       Depth.prototype.setDepth = function setDepth (geomIndex, posIndex, depthValue) {
-         this._depth[geomIndex][posIndex] = depthValue;
-       };
-       Depth.prototype.isNull = function isNull () {
-           var this$1 = this;
+           var tags = Object.assign({}, node.tags); // shallow copy
 
-         if (arguments.length === 0) {
-           for (var i = 0; i < 2; i++) {
-             for (var j = 0; j < 3; j++) {
-               if (this$1._depth[i][j] !== Depth.NULL_VALUE) { return false }
-             }
+           for (var key in defaultTags) {
+             tags[key] = defaultTags[key];
            }
-           return true
-         } else if (arguments.length === 1) {
-           var geomIndex = arguments[0];
-           return this._depth[geomIndex][1] === Depth.NULL_VALUE
-         } else if (arguments.length === 2) {
-           var geomIndex$1 = arguments[0];
-           var posIndex = arguments[1];
-           return this._depth[geomIndex$1][posIndex] === Depth.NULL_VALUE
-         }
-       };
-       Depth.prototype.normalize = function normalize () {
-           var this$1 = this;
 
-         for (var i = 0; i < 2; i++) {
-           if (!this$1.isNull(i)) {
-             var minDepth = this$1._depth[i][1];
-             if (this$1._depth[i][2] < minDepth) { minDepth = this$1._depth[i][2]; }
-             if (minDepth < 0) { minDepth = 0; }
-             for (var j = 1; j < 3; j++) {
-               var newValue = 0;
-               if (this$1._depth[i][j] > minDepth) { newValue = 1; }
-               this$1._depth[i][j] = newValue;
-             }
-           }
+           context.perform(actionChangeTags(node.id, tags), _t('operations.add.annotation.point'));
+           enterSelectMode(node);
          }
-       };
-       Depth.prototype.getDelta = function getDelta (geomIndex) {
-         return this._depth[geomIndex][Position.RIGHT] - this._depth[geomIndex][Position.LEFT]
-       };
-       Depth.prototype.getLocation = function getLocation (geomIndex, posIndex) {
-         if (this._depth[geomIndex][posIndex] <= 0) { return Location.EXTERIOR }
-         return Location.INTERIOR
-       };
-       Depth.prototype.toString = function toString () {
-         return 'A: ' + this._depth[0][1] + ',' + this._depth[0][2] + ' B: ' + this._depth[1][1] + ',' + this._depth[1][2]
-       };
-       Depth.prototype.add = function add () {
-           var this$1 = this;
 
-         if (arguments.length === 1) {
-           var lbl = arguments[0];
-           for (var i = 0; i < 2; i++) {
-             for (var j = 1; j < 3; j++) {
-               var loc = lbl.getLocation(i, j);
-               if (loc === Location.EXTERIOR || loc === Location.INTERIOR) {
-                 if (this$1.isNull(i, j)) {
-                   this$1._depth[i][j] = Depth.depthAtLocation(loc);
-                 } else { this$1._depth[i][j] += Depth.depthAtLocation(loc); }
-               }
-             }
-           }
-         } else if (arguments.length === 3) {
-           var geomIndex = arguments[0];
-           var posIndex = arguments[1];
-           var location = arguments[2];
-           if (location === Location.INTERIOR) { this._depth[geomIndex][posIndex]++; }
-         }
-       };
-       Depth.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       Depth.prototype.getClass = function getClass () {
-         return Depth
-       };
-       Depth.depthAtLocation = function depthAtLocation (location) {
-         if (location === Location.EXTERIOR) { return 0 }
-         if (location === Location.INTERIOR) { return 1 }
-         return Depth.NULL_VALUE
-       };
-       staticAccessors$31.NULL_VALUE.get = function () { return -1 };
-
-       Object.defineProperties( Depth, staticAccessors$31 );
-
-       var Edge = (function (GraphComponent$$1) {
-         function Edge () {
-           GraphComponent$$1.call(this);
-           this.pts = null;
-           this._env = null;
-           this.eiList = new EdgeIntersectionList(this);
-           this._name = null;
-           this._mce = null;
-           this._isIsolated = true;
-           this._depth = new Depth();
-           this._depthDelta = 0;
-           if (arguments.length === 1) {
-             var pts = arguments[0];
-             Edge.call(this, pts, null);
-           } else if (arguments.length === 2) {
-             var pts$1 = arguments[0];
-             var label = arguments[1];
-             this.pts = pts$1;
-             this._label = label;
-           }
+         function cancel() {
+           context.enter(modeBrowse(context));
          }
 
-         if ( GraphComponent$$1 ) Edge.__proto__ = GraphComponent$$1;
-         Edge.prototype = Object.create( GraphComponent$$1 && GraphComponent$$1.prototype );
-         Edge.prototype.constructor = Edge;
-         Edge.prototype.getDepth = function getDepth () {
-           return this._depth
-         };
-         Edge.prototype.getCollapsedEdge = function getCollapsedEdge () {
-           var newPts = new Array(2).fill(null);
-           newPts[0] = this.pts[0];
-           newPts[1] = this.pts[1];
-           var newe = new Edge(newPts, Label.toLineLabel(this._label));
-           return newe
-         };
-         Edge.prototype.isIsolated = function isIsolated () {
-           return this._isIsolated
-         };
-         Edge.prototype.getCoordinates = function getCoordinates () {
-           return this.pts
-         };
-         Edge.prototype.setIsolated = function setIsolated (isIsolated) {
-           this._isIsolated = isIsolated;
+         mode.enter = function () {
+           context.install(behavior);
          };
-         Edge.prototype.setName = function setName (name) {
-           this._name = name;
-         };
-         Edge.prototype.equals = function equals (o) {
-           var this$1 = this;
 
-           if (!(o instanceof Edge)) { return false }
-           var e = o;
-           if (this.pts.length !== e.pts.length) { return false }
-           var isEqualForward = true;
-           var isEqualReverse = true;
-           var iRev = this.pts.length;
-           for (var i = 0; i < this.pts.length; i++) {
-             if (!this$1.pts[i].equals2D(e.pts[i])) {
-               isEqualForward = false;
-             }
-             if (!this$1.pts[i].equals2D(e.pts[--iRev])) {
-               isEqualReverse = false;
-             }
-             if (!isEqualForward && !isEqualReverse) { return false }
-           }
-           return true
+         mode.exit = function () {
+           context.uninstall(behavior);
          };
-         Edge.prototype.getCoordinate = function getCoordinate () {
-           if (arguments.length === 0) {
-             if (this.pts.length > 0) { return this.pts[0] }
-             return null
-           } else if (arguments.length === 1) {
-             var i = arguments[0];
-             return this.pts[i]
-           }
-         };
-         Edge.prototype.print = function print (out) {
-           var this$1 = this;
 
-           out.print('edge ' + this._name + ': ');
-           out.print('LINESTRING (');
-           for (var i = 0; i < this.pts.length; i++) {
-             if (i > 0) { out.print(','); }
-             out.print(this$1.pts[i].x + ' ' + this$1.pts[i].y);
-           }
-           out.print(')  ' + this._label + ' ' + this._depthDelta);
-         };
-         Edge.prototype.computeIM = function computeIM (im) {
-           Edge.updateIM(this._label, im);
-         };
-         Edge.prototype.isCollapsed = function isCollapsed () {
-           if (!this._label.isArea()) { return false }
-           if (this.pts.length !== 3) { return false }
-           if (this.pts[0].equals(this.pts[2])) { return true }
-           return false
-         };
-         Edge.prototype.isClosed = function isClosed () {
-           return this.pts[0].equals(this.pts[this.pts.length - 1])
-         };
-         Edge.prototype.getMaximumSegmentIndex = function getMaximumSegmentIndex () {
-           return this.pts.length - 1
-         };
-         Edge.prototype.getDepthDelta = function getDepthDelta () {
-           return this._depthDelta
-         };
-         Edge.prototype.getNumPoints = function getNumPoints () {
-           return this.pts.length
-         };
-         Edge.prototype.printReverse = function printReverse (out) {
-           var this$1 = this;
+         return mode;
+       }
 
-           out.print('edge ' + this._name + ': ');
-           for (var i = this.pts.length - 1; i >= 0; i--) {
-             out.print(this$1.pts[i] + ' ');
-           }
-           out.println('');
-         };
-         Edge.prototype.getMonotoneChainEdge = function getMonotoneChainEdge () {
-           if (this._mce === null) { this._mce = new MonotoneChainEdge(this); }
-           return this._mce
+       function modeAddNote(context) {
+         var mode = {
+           id: 'add-note',
+           button: 'note',
+           description: _t.html('modes.add_note.description'),
+           key: _t('modes.add_note.key')
          };
-         Edge.prototype.getEnvelope = function getEnvelope () {
-           var this$1 = this;
+         var behavior = behaviorDraw(context).on('click', add).on('cancel', cancel).on('finish', cancel);
 
-           if (this._env === null) {
-             this._env = new Envelope();
-             for (var i = 0; i < this.pts.length; i++) {
-               this$1._env.expandToInclude(this$1.pts[i]);
-             }
-           }
-           return this._env
-         };
-         Edge.prototype.addIntersection = function addIntersection (li, segmentIndex, geomIndex, intIndex) {
-           var intPt = new Coordinate(li.getIntersection(intIndex));
-           var normalizedSegmentIndex = segmentIndex;
-           var dist = li.getEdgeDistance(geomIndex, intIndex);
-           var nextSegIndex = normalizedSegmentIndex + 1;
-           if (nextSegIndex < this.pts.length) {
-             var nextPt = this.pts[nextSegIndex];
-             if (intPt.equals2D(nextPt)) {
-               normalizedSegmentIndex = nextSegIndex;
-               dist = 0.0;
-             }
-           }
-           this.eiList.add(intPt, normalizedSegmentIndex, dist);
-         };
-         Edge.prototype.toString = function toString () {
-           var this$1 = this;
+         function add(loc) {
+           var osm = services.osm;
+           if (!osm) return;
+           var note = osmNote({
+             loc: loc,
+             status: 'open',
+             comments: []
+           });
+           osm.replaceNote(note); // force a reraw (there is no history change that would otherwise do this)
 
-           var buf = new StringBuffer();
-           buf.append('edge ' + this._name + ': ');
-           buf.append('LINESTRING (');
-           for (var i = 0; i < this.pts.length; i++) {
-             if (i > 0) { buf.append(','); }
-             buf.append(this$1.pts[i].x + ' ' + this$1.pts[i].y);
-           }
-           buf.append(')  ' + this._label + ' ' + this._depthDelta);
-           return buf.toString()
-         };
-         Edge.prototype.isPointwiseEqual = function isPointwiseEqual (e) {
-           var this$1 = this;
+           context.map().pan([0, 0]);
+           context.selectedNoteID(note.id).enter(modeSelectNote(context, note.id).newFeature(true));
+         }
 
-           if (this.pts.length !== e.pts.length) { return false }
-           for (var i = 0; i < this.pts.length; i++) {
-             if (!this$1.pts[i].equals2D(e.pts[i])) {
-               return false
-             }
-           }
-           return true
-         };
-         Edge.prototype.setDepthDelta = function setDepthDelta (depthDelta) {
-           this._depthDelta = depthDelta;
-         };
-         Edge.prototype.getEdgeIntersectionList = function getEdgeIntersectionList () {
-           return this.eiList
-         };
-         Edge.prototype.addIntersections = function addIntersections (li, segmentIndex, geomIndex) {
-           var this$1 = this;
+         function cancel() {
+           context.enter(modeBrowse(context));
+         }
 
-           for (var i = 0; i < li.getIntersectionNum(); i++) {
-             this$1.addIntersection(li, segmentIndex, geomIndex, i);
-           }
-         };
-         Edge.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         Edge.prototype.getClass = function getClass () {
-           return Edge
+         mode.enter = function () {
+           context.install(behavior);
          };
-         Edge.updateIM = function updateIM () {
-           if (arguments.length === 2) {
-             var label = arguments[0];
-             var im = arguments[1];
-             im.setAtLeastIfValid(label.getLocation(0, Position.ON), label.getLocation(1, Position.ON), 1);
-             if (label.isArea()) {
-               im.setAtLeastIfValid(label.getLocation(0, Position.LEFT), label.getLocation(1, Position.LEFT), 2);
-               im.setAtLeastIfValid(label.getLocation(0, Position.RIGHT), label.getLocation(1, Position.RIGHT), 2);
-             }
-           } else { return GraphComponent$$1.prototype.updateIM.apply(this, arguments) }
+
+         mode.exit = function () {
+           context.uninstall(behavior);
          };
 
-         return Edge;
-       }(GraphComponent));
+         return mode;
+       }
 
-       var BufferBuilder = function BufferBuilder (bufParams) {
-         this._workingPrecisionModel = null;
-         this._workingNoder = null;
-         this._geomFact = null;
-         this._graph = null;
-         this._edgeList = new EdgeList();
-         this._bufParams = bufParams || null;
-       };
-       BufferBuilder.prototype.setWorkingPrecisionModel = function setWorkingPrecisionModel (pm) {
-         this._workingPrecisionModel = pm;
-       };
-       BufferBuilder.prototype.insertUniqueEdge = function insertUniqueEdge (e) {
-         var existingEdge = this._edgeList.findEqualEdge(e);
-         if (existingEdge !== null) {
-           var existingLabel = existingEdge.getLabel();
-           var labelToMerge = e.getLabel();
-           if (!existingEdge.isPointwiseEqual(e)) {
-             labelToMerge = new Label(e.getLabel());
-             labelToMerge.flip();
-           }
-           existingLabel.merge(labelToMerge);
-           var mergeDelta = BufferBuilder.depthDelta(labelToMerge);
-           var existingDelta = existingEdge.getDepthDelta();
-           var newDelta = existingDelta + mergeDelta;
-           existingEdge.setDepthDelta(newDelta);
-         } else {
-           this._edgeList.add(e);
-           e.setDepthDelta(BufferBuilder.depthDelta(e.getLabel()));
-         }
-       };
-       BufferBuilder.prototype.buildSubgraphs = function buildSubgraphs (subgraphList, polyBuilder) {
-         var processedGraphs = new ArrayList();
-         for (var i = subgraphList.iterator(); i.hasNext();) {
-           var subgraph = i.next();
-           var p = subgraph.getRightmostCoordinate();
-           var locater = new SubgraphDepthLocater(processedGraphs);
-           var outsideDepth = locater.getDepth(p);
-           subgraph.computeDepth(outsideDepth);
-           subgraph.findResultEdges();
-           processedGraphs.add(subgraph);
-           polyBuilder.add(subgraph.getDirectedEdges(), subgraph.getNodes());
-         }
-       };
-       BufferBuilder.prototype.createSubgraphs = function createSubgraphs (graph) {
-         var subgraphList = new ArrayList();
-         for (var i = graph.getNodes().iterator(); i.hasNext();) {
-           var node = i.next();
-           if (!node.isVisited()) {
-             var subgraph = new BufferSubgraph();
-             subgraph.create(node);
-             subgraphList.add(subgraph);
-           }
-         }
-         Collections.sort(subgraphList, Collections.reverseOrder());
-         return subgraphList
-       };
-       BufferBuilder.prototype.createEmptyResultGeometry = function createEmptyResultGeometry () {
-         var emptyGeom = this._geomFact.createPolygon();
-         return emptyGeom
-       };
-       BufferBuilder.prototype.getNoder = function getNoder (precisionModel) {
-         if (this._workingNoder !== null) { return this._workingNoder }
-         var noder = new MCIndexNoder();
-         var li = new RobustLineIntersector();
-         li.setPrecisionModel(precisionModel);
-         noder.setSegmentIntersector(new IntersectionAdder(li));
-         return noder
-       };
-       BufferBuilder.prototype.buffer = function buffer (g, distance) {
-         var precisionModel = this._workingPrecisionModel;
-         if (precisionModel === null) { precisionModel = g.getPrecisionModel(); }
-         this._geomFact = g.getFactory();
-         var curveBuilder = new OffsetCurveBuilder(precisionModel, this._bufParams);
-         var curveSetBuilder = new OffsetCurveSetBuilder(g, distance, curveBuilder);
-         var bufferSegStrList = curveSetBuilder.getCurves();
-         if (bufferSegStrList.size() <= 0) {
-           return this.createEmptyResultGeometry()
-         }
-         this.computeNodedEdges(bufferSegStrList, precisionModel);
-         this._graph = new PlanarGraph(new OverlayNodeFactory());
-         this._graph.addEdges(this._edgeList.getEdges());
-         var subgraphList = this.createSubgraphs(this._graph);
-         var polyBuilder = new PolygonBuilder(this._geomFact);
-         this.buildSubgraphs(subgraphList, polyBuilder);
-         var resultPolyList = polyBuilder.getPolygons();
-         if (resultPolyList.size() <= 0) {
-           return this.createEmptyResultGeometry()
-         }
-         var resultGeom = this._geomFact.buildGeometry(resultPolyList);
-         return resultGeom
-       };
-       BufferBuilder.prototype.computeNodedEdges = function computeNodedEdges (bufferSegStrList, precisionModel) {
-           var this$1 = this;
-
-         var noder = this.getNoder(precisionModel);
-         noder.computeNodes(bufferSegStrList);
-         var nodedSegStrings = noder.getNodedSubstrings();
-         for (var i = nodedSegStrings.iterator(); i.hasNext();) {
-           var segStr = i.next();
-           var pts = segStr.getCoordinates();
-           if (pts.length === 2 && pts[0].equals2D(pts[1])) { continue }
-           var oldLabel = segStr.getData();
-           var edge = new Edge(segStr.getCoordinates(), new Label(oldLabel));
-           this$1.insertUniqueEdge(edge);
+       function uiConflicts(context) {
+         var dispatch$1 = dispatch('cancel', 'save');
+         var keybinding = utilKeybinding('conflicts');
+
+         var _origChanges;
+
+         var _conflictList;
+
+         var _shownConflictIndex;
+
+         function keybindingOn() {
+           select(document).call(keybinding.on('⎋', cancel, true));
          }
-       };
-       BufferBuilder.prototype.setNoder = function setNoder (noder) {
-         this._workingNoder = noder;
-       };
-       BufferBuilder.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       BufferBuilder.prototype.getClass = function getClass () {
-         return BufferBuilder
-       };
-       BufferBuilder.depthDelta = function depthDelta (label) {
-         var lLoc = label.getLocation(0, Position.LEFT);
-         var rLoc = label.getLocation(0, Position.RIGHT);
-         if (lLoc === Location.INTERIOR && rLoc === Location.EXTERIOR) { return 1; } else if (lLoc === Location.EXTERIOR && rLoc === Location.INTERIOR) { return -1 }
-         return 0
-       };
-       BufferBuilder.convertSegStrings = function convertSegStrings (it) {
-         var fact = new GeometryFactory();
-         var lines = new ArrayList();
-         while (it.hasNext()) {
-           var ss = it.next();
-           var line = fact.createLineString(ss.getCoordinates());
-           lines.add(line);
-         }
-         return fact.buildGeometry(lines)
-       };
 
-       var ScaledNoder = function ScaledNoder () {
-         this._noder = null;
-         this._scaleFactor = null;
-         this._offsetX = null;
-         this._offsetY = null;
-         this._isScaled = false;
-         if (arguments.length === 2) {
-           var noder = arguments[0];
-           var scaleFactor = arguments[1];
-           this._noder = noder;
-           this._scaleFactor = scaleFactor;
-           this._offsetX = 0.0;
-           this._offsetY = 0.0;
-           this._isScaled = !this.isIntegerPrecision();
-         } else if (arguments.length === 4) {
-           var noder$1 = arguments[0];
-           var scaleFactor$1 = arguments[1];
-           var offsetX = arguments[2];
-           var offsetY = arguments[3];
-           this._noder = noder$1;
-           this._scaleFactor = scaleFactor$1;
-           this._offsetX = offsetX;
-           this._offsetY = offsetY;
-           this._isScaled = !this.isIntegerPrecision();
+         function keybindingOff() {
+           select(document).call(keybinding.unbind);
          }
-       };
-       ScaledNoder.prototype.rescale = function rescale () {
-           var this$1 = this;
-
-         if (hasInterface(arguments[0], Collection)) {
-           var segStrings = arguments[0];
-           for (var i = segStrings.iterator(); i.hasNext();) {
-             var ss = i.next();
-             this$1.rescale(ss.getCoordinates());
-           }
-         } else if (arguments[0] instanceof Array) {
-           var pts = arguments[0];
-           // let p0 = null
-           // let p1 = null
-           // if (pts.length === 2) {
-           // p0 = new Coordinate(pts[0])
-           // p1 = new Coordinate(pts[1])
-           // }
-           for (var i$1 = 0; i$1 < pts.length; i$1++) {
-             pts[i$1].x = pts[i$1].x / this$1._scaleFactor + this$1._offsetX;
-             pts[i$1].y = pts[i$1].y / this$1._scaleFactor + this$1._offsetY;
-           }
-           if (pts.length === 2 && pts[0].equals2D(pts[1])) {
-             System.out.println(pts);
-           }
+
+         function tryAgain() {
+           keybindingOff();
+           dispatch$1.call('save');
          }
-       };
-       ScaledNoder.prototype.scale = function scale () {
-           var this$1 = this;
-
-         if (hasInterface(arguments[0], Collection)) {
-           var segStrings = arguments[0];
-           var nodedSegmentStrings = new ArrayList();
-           for (var i = segStrings.iterator(); i.hasNext();) {
-             var ss = i.next();
-             nodedSegmentStrings.add(new NodedSegmentString(this$1.scale(ss.getCoordinates()), ss.getData()));
-           }
-           return nodedSegmentStrings
-         } else if (arguments[0] instanceof Array) {
-           var pts = arguments[0];
-           var roundPts = new Array(pts.length).fill(null);
-           for (var i$1 = 0; i$1 < pts.length; i$1++) {
-             roundPts[i$1] = new Coordinate(Math.round((pts[i$1].x - this$1._offsetX) * this$1._scaleFactor), Math.round((pts[i$1].y - this$1._offsetY) * this$1._scaleFactor), pts[i$1].z);
-           }
-           var roundPtsNoDup = CoordinateArrays.removeRepeatedPoints(roundPts);
-           return roundPtsNoDup
+
+         function cancel() {
+           keybindingOff();
+           dispatch$1.call('cancel');
          }
-       };
-       ScaledNoder.prototype.isIntegerPrecision = function isIntegerPrecision () {
-         return this._scaleFactor === 1.0
-       };
-       ScaledNoder.prototype.getNodedSubstrings = function getNodedSubstrings () {
-         var splitSS = this._noder.getNodedSubstrings();
-         if (this._isScaled) { this.rescale(splitSS); }
-         return splitSS
-       };
-       ScaledNoder.prototype.computeNodes = function computeNodes (inputSegStrings) {
-         var intSegStrings = inputSegStrings;
-         if (this._isScaled) { intSegStrings = this.scale(inputSegStrings); }
-         this._noder.computeNodes(intSegStrings);
-       };
-       ScaledNoder.prototype.interfaces_ = function interfaces_ () {
-         return [Noder]
-       };
-       ScaledNoder.prototype.getClass = function getClass () {
-         return ScaledNoder
-       };
 
-       var NodingValidator = function NodingValidator () {
-         this._li = new RobustLineIntersector();
-         this._segStrings = null;
-         var segStrings = arguments[0];
-         this._segStrings = segStrings;
-       };
+         function conflicts(selection) {
+           keybindingOn();
+           var headerEnter = selection.selectAll('.header').data([0]).enter().append('div').attr('class', 'header fillL');
+           headerEnter.append('button').attr('class', 'fr').on('click', cancel).call(svgIcon('#iD-icon-close'));
+           headerEnter.append('h3').html(_t.html('save.conflict.header'));
+           var bodyEnter = selection.selectAll('.body').data([0]).enter().append('div').attr('class', 'body fillL');
+           var conflictsHelpEnter = bodyEnter.append('div').attr('class', 'conflicts-help').html(_t.html('save.conflict.help')); // Download changes link
 
-       var staticAccessors$33 = { fact: { configurable: true } };
-       NodingValidator.prototype.checkEndPtVertexIntersections = function checkEndPtVertexIntersections () {
-           var this$1 = this;
+           var detected = utilDetect();
+           var changeset = new osmChangeset();
+           delete changeset.id; // Export without changeset_id
 
-         if (arguments.length === 0) {
-           for (var i = this._segStrings.iterator(); i.hasNext();) {
-             var ss = i.next();
-             var pts = ss.getCoordinates();
-             this$1.checkEndPtVertexIntersections(pts[0], this$1._segStrings);
-             this$1.checkEndPtVertexIntersections(pts[pts.length - 1], this$1._segStrings);
-           }
-         } else if (arguments.length === 2) {
-           var testPt = arguments[0];
-           var segStrings = arguments[1];
-           for (var i$1 = segStrings.iterator(); i$1.hasNext();) {
-             var ss$1 = i$1.next();
-             var pts$1 = ss$1.getCoordinates();
-             for (var j = 1; j < pts$1.length - 1; j++) {
-               if (pts$1[j].equals(testPt)) { throw new RuntimeException('found endpt/interior pt intersection at index ' + j + ' :pt ' + testPt) }
-             }
-           }
-         }
-       };
-       NodingValidator.prototype.checkInteriorIntersections = function checkInteriorIntersections () {
-           var this$1 = this;
-
-         if (arguments.length === 0) {
-           for (var i = this._segStrings.iterator(); i.hasNext();) {
-             var ss0 = i.next();
-             for (var j = this._segStrings.iterator(); j.hasNext();) {
-               var ss1 = j.next();
-               this$1.checkInteriorIntersections(ss0, ss1);
-             }
-           }
-         } else if (arguments.length === 2) {
-           var ss0$1 = arguments[0];
-           var ss1$1 = arguments[1];
-           var pts0 = ss0$1.getCoordinates();
-           var pts1 = ss1$1.getCoordinates();
-           for (var i0 = 0; i0 < pts0.length - 1; i0++) {
-             for (var i1 = 0; i1 < pts1.length - 1; i1++) {
-               this$1.checkInteriorIntersections(ss0$1, i0, ss1$1, i1);
-             }
-           }
-         } else if (arguments.length === 4) {
-           var e0 = arguments[0];
-           var segIndex0 = arguments[1];
-           var e1 = arguments[2];
-           var segIndex1 = arguments[3];
-           if (e0 === e1 && segIndex0 === segIndex1) { return null }
-           var p00 = e0.getCoordinates()[segIndex0];
-           var p01 = e0.getCoordinates()[segIndex0 + 1];
-           var p10 = e1.getCoordinates()[segIndex1];
-           var p11 = e1.getCoordinates()[segIndex1 + 1];
-           this._li.computeIntersection(p00, p01, p10, p11);
-           if (this._li.hasIntersection()) {
-             if (this._li.isProper() || this.hasInteriorIntersection(this._li, p00, p01) || this.hasInteriorIntersection(this._li, p10, p11)) {
-               throw new RuntimeException('found non-noded intersection at ' + p00 + '-' + p01 + ' and ' + p10 + '-' + p11)
-             }
-           }
-         }
-       };
-       NodingValidator.prototype.checkValid = function checkValid () {
-         this.checkEndPtVertexIntersections();
-         this.checkInteriorIntersections();
-         this.checkCollapses();
-       };
-       NodingValidator.prototype.checkCollapses = function checkCollapses () {
-           var this$1 = this;
+           var data = JXON.stringify(changeset.osmChangeJXON(_origChanges));
+           var blob = new Blob([data], {
+             type: 'text/xml;charset=utf-8;'
+           });
+           var fileName = 'changes.osc';
+           var linkEnter = conflictsHelpEnter.selectAll('.download-changes').append('a').attr('class', 'download-changes');
 
-         if (arguments.length === 0) {
-           for (var i = this._segStrings.iterator(); i.hasNext();) {
-             var ss = i.next();
-             this$1.checkCollapses(ss);
-           }
-         } else if (arguments.length === 1) {
-           var ss$1 = arguments[0];
-           var pts = ss$1.getCoordinates();
-           for (var i$1 = 0; i$1 < pts.length - 2; i$1++) {
-             this$1.checkCollapse(pts[i$1], pts[i$1 + 1], pts[i$1 + 2]);
+           if (detected.download) {
+             // All except IE11 and Edge
+             linkEnter // download the data as a file
+             .attr('href', window.URL.createObjectURL(blob)).attr('download', fileName);
+           } else {
+             // IE11 and Edge
+             linkEnter // open data uri in a new tab
+             .attr('target', '_blank').on('click.download', function () {
+               navigator.msSaveBlob(blob, fileName);
+             });
            }
-         }
-       };
-       NodingValidator.prototype.hasInteriorIntersection = function hasInteriorIntersection (li, p0, p1) {
-         for (var i = 0; i < li.getIntersectionNum(); i++) {
-           var intPt = li.getIntersection(i);
-           if (!(intPt.equals(p0) || intPt.equals(p1))) { return true }
-         }
-         return false
-       };
-       NodingValidator.prototype.checkCollapse = function checkCollapse (p0, p1, p2) {
-         if (p0.equals(p2)) { throw new RuntimeException('found non-noded collapse at ' + NodingValidator.fact.createLineString([p0, p1, p2])) }
-       };
-       NodingValidator.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       NodingValidator.prototype.getClass = function getClass () {
-         return NodingValidator
-       };
-       staticAccessors$33.fact.get = function () { return new GeometryFactory() };
-
-       Object.defineProperties( NodingValidator, staticAccessors$33 );
-
-       var HotPixel = function HotPixel () {
-         this._li = null;
-         this._pt = null;
-         this._originalPt = null;
-         this._ptScaled = null;
-         this._p0Scaled = null;
-         this._p1Scaled = null;
-         this._scaleFactor = null;
-         this._minx = null;
-         this._maxx = null;
-         this._miny = null;
-         this._maxy = null;
-         this._corner = new Array(4).fill(null);
-         this._safeEnv = null;
-         var pt = arguments[0];
-         var scaleFactor = arguments[1];
-         var li = arguments[2];
-         this._originalPt = pt;
-         this._pt = pt;
-         this._scaleFactor = scaleFactor;
-         this._li = li;
-         if (scaleFactor <= 0) { throw new IllegalArgumentException('Scale factor must be non-zero') }
-         if (scaleFactor !== 1.0) {
-           this._pt = new Coordinate(this.scale(pt.x), this.scale(pt.y));
-           this._p0Scaled = new Coordinate();
-           this._p1Scaled = new Coordinate();
-         }
-         this.initCorners(this._pt);
-       };
 
-       var staticAccessors$34 = { SAFE_ENV_EXPANSION_FACTOR: { configurable: true } };
-       HotPixel.prototype.intersectsScaled = function intersectsScaled (p0, p1) {
-         var segMinx = Math.min(p0.x, p1.x);
-         var segMaxx = Math.max(p0.x, p1.x);
-         var segMiny = Math.min(p0.y, p1.y);
-         var segMaxy = Math.max(p0.y, p1.y);
-         var isOutsidePixelEnv = this._maxx < segMinx || this._minx > segMaxx || this._maxy < segMiny || this._miny > segMaxy;
-         if (isOutsidePixelEnv) { return false }
-         var intersects = this.intersectsToleranceSquare(p0, p1);
-         Assert.isTrue(!(isOutsidePixelEnv && intersects), 'Found bad envelope test');
-         return intersects
-       };
-       HotPixel.prototype.initCorners = function initCorners (pt) {
-         var tolerance = 0.5;
-         this._minx = pt.x - tolerance;
-         this._maxx = pt.x + tolerance;
-         this._miny = pt.y - tolerance;
-         this._maxy = pt.y + tolerance;
-         this._corner[0] = new Coordinate(this._maxx, this._maxy);
-         this._corner[1] = new Coordinate(this._minx, this._maxy);
-         this._corner[2] = new Coordinate(this._minx, this._miny);
-         this._corner[3] = new Coordinate(this._maxx, this._miny);
-       };
-       HotPixel.prototype.intersects = function intersects (p0, p1) {
-         if (this._scaleFactor === 1.0) { return this.intersectsScaled(p0, p1) }
-         this.copyScaled(p0, this._p0Scaled);
-         this.copyScaled(p1, this._p1Scaled);
-         return this.intersectsScaled(this._p0Scaled, this._p1Scaled)
-       };
-       HotPixel.prototype.scale = function scale (val) {
-         return Math.round(val * this._scaleFactor)
-       };
-       HotPixel.prototype.getCoordinate = function getCoordinate () {
-         return this._originalPt
-       };
-       HotPixel.prototype.copyScaled = function copyScaled (p, pScaled) {
-         pScaled.x = this.scale(p.x);
-         pScaled.y = this.scale(p.y);
-       };
-       HotPixel.prototype.getSafeEnvelope = function getSafeEnvelope () {
-         if (this._safeEnv === null) {
-           var safeTolerance = HotPixel.SAFE_ENV_EXPANSION_FACTOR / this._scaleFactor;
-           this._safeEnv = new Envelope(this._originalPt.x - safeTolerance, this._originalPt.x + safeTolerance, this._originalPt.y - safeTolerance, this._originalPt.y + safeTolerance);
+           linkEnter.call(svgIcon('#iD-icon-load', 'inline')).append('span').html(_t.html('save.conflict.download_changes'));
+           bodyEnter.append('div').attr('class', 'conflict-container fillL3').call(showConflict, 0);
+           bodyEnter.append('div').attr('class', 'conflicts-done').attr('opacity', 0).style('display', 'none').html(_t.html('save.conflict.done'));
+           var buttonsEnter = bodyEnter.append('div').attr('class', 'buttons col12 joined conflicts-buttons');
+           buttonsEnter.append('button').attr('disabled', _conflictList.length > 1).attr('class', 'action conflicts-button col6').html(_t.html('save.title')).on('click.try_again', tryAgain);
+           buttonsEnter.append('button').attr('class', 'secondary-action conflicts-button col6').html(_t.html('confirm.cancel')).on('click.cancel', cancel);
+         }
+
+         function showConflict(selection, index) {
+           index = utilWrap(index, _conflictList.length);
+           _shownConflictIndex = index;
+           var parent = select(selection.node().parentNode); // enable save button if this is the last conflict being reviewed..
+
+           if (index === _conflictList.length - 1) {
+             window.setTimeout(function () {
+               parent.select('.conflicts-button').attr('disabled', null);
+               parent.select('.conflicts-done').transition().attr('opacity', 1).style('display', 'block');
+             }, 250);
+           }
+
+           var conflict = selection.selectAll('.conflict').data([_conflictList[index]]);
+           conflict.exit().remove();
+           var conflictEnter = conflict.enter().append('div').attr('class', 'conflict');
+           conflictEnter.append('h4').attr('class', 'conflict-count').html(_t.html('save.conflict.count', {
+             num: index + 1,
+             total: _conflictList.length
+           }));
+           conflictEnter.append('a').attr('class', 'conflict-description').attr('href', '#').html(function (d) {
+             return d.name;
+           }).on('click', function (d3_event, d) {
+             d3_event.preventDefault();
+             zoomToEntity(d.id);
+           });
+           var details = conflictEnter.append('div').attr('class', 'conflict-detail-container');
+           details.append('ul').attr('class', 'conflict-detail-list').selectAll('li').data(function (d) {
+             return d.details || [];
+           }).enter().append('li').attr('class', 'conflict-detail-item').html(function (d) {
+             return d;
+           });
+           details.append('div').attr('class', 'conflict-choices').call(addChoices);
+           details.append('div').attr('class', 'conflict-nav-buttons joined cf').selectAll('button').data(['previous', 'next']).enter().append('button').html(function (d) {
+             return _t.html('save.conflict.' + d);
+           }).attr('class', 'conflict-nav-button action col6').attr('disabled', function (d, i) {
+             return i === 0 && index === 0 || i === 1 && index === _conflictList.length - 1 || null;
+           }).on('click', function (d3_event, d) {
+             d3_event.preventDefault();
+             var container = parent.selectAll('.conflict-container');
+             var sign = d === 'previous' ? -1 : 1;
+             container.selectAll('.conflict').remove();
+             container.call(showConflict, index + sign);
+           });
          }
-         return this._safeEnv
-       };
-       HotPixel.prototype.intersectsPixelClosure = function intersectsPixelClosure (p0, p1) {
-         this._li.computeIntersection(p0, p1, this._corner[0], this._corner[1]);
-         if (this._li.hasIntersection()) { return true }
-         this._li.computeIntersection(p0, p1, this._corner[1], this._corner[2]);
-         if (this._li.hasIntersection()) { return true }
-         this._li.computeIntersection(p0, p1, this._corner[2], this._corner[3]);
-         if (this._li.hasIntersection()) { return true }
-         this._li.computeIntersection(p0, p1, this._corner[3], this._corner[0]);
-         if (this._li.hasIntersection()) { return true }
-         return false
-       };
-       HotPixel.prototype.intersectsToleranceSquare = function intersectsToleranceSquare (p0, p1) {
-         var intersectsLeft = false;
-         var intersectsBottom = false;
-         this._li.computeIntersection(p0, p1, this._corner[0], this._corner[1]);
-         if (this._li.isProper()) { return true }
-         this._li.computeIntersection(p0, p1, this._corner[1], this._corner[2]);
-         if (this._li.isProper()) { return true }
-         if (this._li.hasIntersection()) { intersectsLeft = true; }
-         this._li.computeIntersection(p0, p1, this._corner[2], this._corner[3]);
-         if (this._li.isProper()) { return true }
-         if (this._li.hasIntersection()) { intersectsBottom = true; }
-         this._li.computeIntersection(p0, p1, this._corner[3], this._corner[0]);
-         if (this._li.isProper()) { return true }
-         if (intersectsLeft && intersectsBottom) { return true }
-         if (p0.equals(this._pt)) { return true }
-         if (p1.equals(this._pt)) { return true }
-         return false
-       };
-       HotPixel.prototype.addSnappedNode = function addSnappedNode (segStr, segIndex) {
-         var p0 = segStr.getCoordinate(segIndex);
-         var p1 = segStr.getCoordinate(segIndex + 1);
-         if (this.intersects(p0, p1)) {
-           segStr.addIntersection(this.getCoordinate(), segIndex);
-           return true
-         }
-         return false
-       };
-       HotPixel.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       HotPixel.prototype.getClass = function getClass () {
-         return HotPixel
-       };
-       staticAccessors$34.SAFE_ENV_EXPANSION_FACTOR.get = function () { return 0.75 };
 
-       Object.defineProperties( HotPixel, staticAccessors$34 );
+         function addChoices(selection) {
+           var choices = selection.append('ul').attr('class', 'layer-list').selectAll('li').data(function (d) {
+             return d.choices || [];
+           }); // enter
 
-       var MonotoneChainSelectAction = function MonotoneChainSelectAction () {
-         this.tempEnv1 = new Envelope();
-         this.selectedSegment = new LineSegment();
-       };
-       MonotoneChainSelectAction.prototype.select = function select () {
-         if (arguments.length === 1) ; else if (arguments.length === 2) {
-           var mc = arguments[0];
-           var startIndex = arguments[1];
-           mc.getLineSegment(startIndex, this.selectedSegment);
-           this.select(this.selectedSegment);
-         }
-       };
-       MonotoneChainSelectAction.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       MonotoneChainSelectAction.prototype.getClass = function getClass () {
-         return MonotoneChainSelectAction
-       };
+           var choicesEnter = choices.enter().append('li').attr('class', 'layer');
+           var labelEnter = choicesEnter.append('label');
+           labelEnter.append('input').attr('type', 'radio').attr('name', function (d) {
+             return d.id;
+           }).on('change', function (d3_event, d) {
+             var ul = this.parentNode.parentNode.parentNode;
+             ul.__data__.chosen = d.id;
+             choose(d3_event, ul, d);
+           });
+           labelEnter.append('span').html(function (d) {
+             return d.text;
+           }); // update
 
-       var MCIndexPointSnapper = function MCIndexPointSnapper () {
-         this._index = null;
-         var index = arguments[0];
-         this._index = index;
-       };
+           choicesEnter.merge(choices).each(function (d) {
+             var ul = this.parentNode;
 
-       var staticAccessors$35 = { HotPixelSnapAction: { configurable: true } };
-       MCIndexPointSnapper.prototype.snap = function snap () {
-         if (arguments.length === 1) {
-           var hotPixel = arguments[0];
-           return this.snap(hotPixel, null, -1)
-         } else if (arguments.length === 3) {
-           var hotPixel$1 = arguments[0];
-           var parentEdge = arguments[1];
-           var hotPixelVertexIndex = arguments[2];
-           var pixelEnv = hotPixel$1.getSafeEnvelope();
-           var hotPixelSnapAction = new HotPixelSnapAction(hotPixel$1, parentEdge, hotPixelVertexIndex);
-           this._index.query(pixelEnv, {
-             interfaces_: function () {
-               return [ItemVisitor]
-             },
-             visitItem: function (item) {
-               var testChain = item;
-               testChain.select(pixelEnv, hotPixelSnapAction);
+             if (ul.__data__.chosen === d.id) {
+               choose(null, ul, d);
              }
            });
-           return hotPixelSnapAction.isNodeAdded()
          }
-       };
-       MCIndexPointSnapper.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       MCIndexPointSnapper.prototype.getClass = function getClass () {
-         return MCIndexPointSnapper
-       };
-       staticAccessors$35.HotPixelSnapAction.get = function () { return HotPixelSnapAction };
-
-       Object.defineProperties( MCIndexPointSnapper, staticAccessors$35 );
-
-       var HotPixelSnapAction = (function (MonotoneChainSelectAction$$1) {
-         function HotPixelSnapAction () {
-           MonotoneChainSelectAction$$1.call(this);
-           this._hotPixel = null;
-           this._parentEdge = null;
-           this._hotPixelVertexIndex = null;
-           this._isNodeAdded = false;
-           var hotPixel = arguments[0];
-           var parentEdge = arguments[1];
-           var hotPixelVertexIndex = arguments[2];
-           this._hotPixel = hotPixel;
-           this._parentEdge = parentEdge;
-           this._hotPixelVertexIndex = hotPixelVertexIndex;
-         }
-
-         if ( MonotoneChainSelectAction$$1 ) HotPixelSnapAction.__proto__ = MonotoneChainSelectAction$$1;
-         HotPixelSnapAction.prototype = Object.create( MonotoneChainSelectAction$$1 && MonotoneChainSelectAction$$1.prototype );
-         HotPixelSnapAction.prototype.constructor = HotPixelSnapAction;
-         HotPixelSnapAction.prototype.isNodeAdded = function isNodeAdded () {
-           return this._isNodeAdded
-         };
-         HotPixelSnapAction.prototype.select = function select () {
-           if (arguments.length === 2) {
-             var mc = arguments[0];
-             var startIndex = arguments[1];
-             var ss = mc.getContext();
-             if (this._parentEdge !== null) {
-               if (ss === this._parentEdge && startIndex === this._hotPixelVertexIndex) { return null }
-             }
-             this._isNodeAdded = this._hotPixel.addSnappedNode(ss, startIndex);
-           } else { return MonotoneChainSelectAction$$1.prototype.select.apply(this, arguments) }
-         };
-         HotPixelSnapAction.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         HotPixelSnapAction.prototype.getClass = function getClass () {
-           return HotPixelSnapAction
-         };
-
-         return HotPixelSnapAction;
-       }(MonotoneChainSelectAction));
-
-       var InteriorIntersectionFinderAdder = function InteriorIntersectionFinderAdder () {
-         this._li = null;
-         this._interiorIntersections = null;
-         var li = arguments[0];
-         this._li = li;
-         this._interiorIntersections = new ArrayList();
-       };
-       InteriorIntersectionFinderAdder.prototype.processIntersections = function processIntersections (e0, segIndex0, e1, segIndex1) {
-           var this$1 = this;
 
-         if (e0 === e1 && segIndex0 === segIndex1) { return null }
-         var p00 = e0.getCoordinates()[segIndex0];
-         var p01 = e0.getCoordinates()[segIndex0 + 1];
-         var p10 = e1.getCoordinates()[segIndex1];
-         var p11 = e1.getCoordinates()[segIndex1 + 1];
-         this._li.computeIntersection(p00, p01, p10, p11);
-         if (this._li.hasIntersection()) {
-           if (this._li.isInteriorIntersection()) {
-             for (var intIndex = 0; intIndex < this._li.getIntersectionNum(); intIndex++) {
-               this$1._interiorIntersections.add(this$1._li.getIntersection(intIndex));
+         function choose(d3_event, ul, datum) {
+           if (d3_event) d3_event.preventDefault();
+           select(ul).selectAll('li').classed('active', function (d) {
+             return d === datum;
+           }).selectAll('input').property('checked', function (d) {
+             return d === datum;
+           });
+           var extent = geoExtent();
+           var entity;
+           entity = context.graph().hasEntity(datum.id);
+           if (entity) extent._extend(entity.extent(context.graph()));
+           datum.action();
+           entity = context.graph().hasEntity(datum.id);
+           if (entity) extent._extend(entity.extent(context.graph()));
+           zoomToEntity(datum.id, extent);
+         }
+
+         function zoomToEntity(id, extent) {
+           context.surface().selectAll('.hover').classed('hover', false);
+           var entity = context.graph().hasEntity(id);
+
+           if (entity) {
+             if (extent) {
+               context.map().trimmedExtent(extent);
+             } else {
+               context.map().zoomToEase(entity);
              }
-             e0.addIntersections(this._li, segIndex0, 0);
-             e1.addIntersections(this._li, segIndex1, 1);
+
+             context.surface().selectAll(utilEntityOrMemberSelector([entity.id], context.graph())).classed('hover', true);
            }
-         }
-       };
-       InteriorIntersectionFinderAdder.prototype.isDone = function isDone () {
-         return false
-       };
-       InteriorIntersectionFinderAdder.prototype.getInteriorIntersections = function getInteriorIntersections () {
-         return this._interiorIntersections
-       };
-       InteriorIntersectionFinderAdder.prototype.interfaces_ = function interfaces_ () {
-         return [SegmentIntersector]
-       };
-       InteriorIntersectionFinderAdder.prototype.getClass = function getClass () {
-         return InteriorIntersectionFinderAdder
-       };
+         } // The conflict list should be an array of objects like:
+         // {
+         //     id: id,
+         //     name: entityName(local),
+         //     details: merge.conflicts(),
+         //     chosen: 1,
+         //     choices: [
+         //         choice(id, keepMine, forceLocal),
+         //         choice(id, keepTheirs, forceRemote)
+         //     ]
+         // }
 
-       var MCIndexSnapRounder = function MCIndexSnapRounder () {
-         this._pm = null;
-         this._li = null;
-         this._scaleFactor = null;
-         this._noder = null;
-         this._pointSnapper = null;
-         this._nodedSegStrings = null;
-         var pm = arguments[0];
-         this._pm = pm;
-         this._li = new RobustLineIntersector();
-         this._li.setPrecisionModel(pm);
-         this._scaleFactor = pm.getScale();
-       };
-       MCIndexSnapRounder.prototype.checkCorrectness = function checkCorrectness (inputSegmentStrings) {
-         var resultSegStrings = NodedSegmentString.getNodedSubstrings(inputSegmentStrings);
-         var nv = new NodingValidator(resultSegStrings);
-         try {
-           nv.checkValid();
-         } catch (ex) {
-           if (ex instanceof Exception) {
-             ex.printStackTrace();
-           } else { throw ex }
-         } finally {}
-       };
-       MCIndexSnapRounder.prototype.getNodedSubstrings = function getNodedSubstrings () {
-         return NodedSegmentString.getNodedSubstrings(this._nodedSegStrings)
-       };
-       MCIndexSnapRounder.prototype.snapRound = function snapRound (segStrings, li) {
-         var intersections = this.findInteriorIntersections(segStrings, li);
-         this.computeIntersectionSnaps(intersections);
-         this.computeVertexSnaps(segStrings);
-       };
-       MCIndexSnapRounder.prototype.findInteriorIntersections = function findInteriorIntersections (segStrings, li) {
-         var intFinderAdder = new InteriorIntersectionFinderAdder(li);
-         this._noder.setSegmentIntersector(intFinderAdder);
-         this._noder.computeNodes(segStrings);
-         return intFinderAdder.getInteriorIntersections()
-       };
-       MCIndexSnapRounder.prototype.computeVertexSnaps = function computeVertexSnaps () {
-           var this$1 = this;
 
-         if (hasInterface(arguments[0], Collection)) {
-           var edges = arguments[0];
-           for (var i0 = edges.iterator(); i0.hasNext();) {
-             var edge0 = i0.next();
-             this$1.computeVertexSnaps(edge0);
-           }
-         } else if (arguments[0] instanceof NodedSegmentString) {
-           var e = arguments[0];
-           var pts0 = e.getCoordinates();
-           for (var i = 0; i < pts0.length; i++) {
-             var hotPixel = new HotPixel(pts0[i], this$1._scaleFactor, this$1._li);
-             var isNodeAdded = this$1._pointSnapper.snap(hotPixel, e, i);
-             if (isNodeAdded) {
-               e.addIntersection(pts0[i], i);
-             }
+         conflicts.conflictList = function (_) {
+           if (!arguments.length) return _conflictList;
+           _conflictList = _;
+           return conflicts;
+         };
+
+         conflicts.origChanges = function (_) {
+           if (!arguments.length) return _origChanges;
+           _origChanges = _;
+           return conflicts;
+         };
+
+         conflicts.shownEntityIds = function () {
+           if (_conflictList && typeof _shownConflictIndex === 'number') {
+             return [_conflictList[_shownConflictIndex].id];
            }
-         }
-       };
-       MCIndexSnapRounder.prototype.computeNodes = function computeNodes (inputSegmentStrings) {
-         this._nodedSegStrings = inputSegmentStrings;
-         this._noder = new MCIndexNoder();
-         this._pointSnapper = new MCIndexPointSnapper(this._noder.getIndex());
-         this.snapRound(inputSegmentStrings, this._li);
-       };
-       MCIndexSnapRounder.prototype.computeIntersectionSnaps = function computeIntersectionSnaps (snapPts) {
-           var this$1 = this;
 
-         for (var it = snapPts.iterator(); it.hasNext();) {
-           var snapPt = it.next();
-           var hotPixel = new HotPixel(snapPt, this$1._scaleFactor, this$1._li);
-           this$1._pointSnapper.snap(hotPixel);
-         }
-       };
-       MCIndexSnapRounder.prototype.interfaces_ = function interfaces_ () {
-         return [Noder]
-       };
-       MCIndexSnapRounder.prototype.getClass = function getClass () {
-         return MCIndexSnapRounder
-       };
+           return [];
+         };
 
-       var BufferOp = function BufferOp () {
-         this._argGeom = null;
-         this._distance = null;
-         this._bufParams = new BufferParameters();
-         this._resultGeometry = null;
-         this._saveException = null;
-         if (arguments.length === 1) {
-           var g = arguments[0];
-           this._argGeom = g;
-         } else if (arguments.length === 2) {
-           var g$1 = arguments[0];
-           var bufParams = arguments[1];
-           this._argGeom = g$1;
-           this._bufParams = bufParams;
-         }
-       };
+         return utilRebind(conflicts, dispatch$1, 'on');
+       }
 
-       var staticAccessors$32 = { CAP_ROUND: { configurable: true },CAP_BUTT: { configurable: true },CAP_FLAT: { configurable: true },CAP_SQUARE: { configurable: true },MAX_PRECISION_DIGITS: { configurable: true } };
-       BufferOp.prototype.bufferFixedPrecision = function bufferFixedPrecision (fixedPM) {
-         var noder = new ScaledNoder(new MCIndexSnapRounder(new PrecisionModel(1.0)), fixedPM.getScale());
-         var bufBuilder = new BufferBuilder(this._bufParams);
-         bufBuilder.setWorkingPrecisionModel(fixedPM);
-         bufBuilder.setNoder(noder);
-         this._resultGeometry = bufBuilder.buffer(this._argGeom, this._distance);
-       };
-       BufferOp.prototype.bufferReducedPrecision = function bufferReducedPrecision () {
-           var this$1 = this;
+       function uiConfirm(selection) {
+         var modalSelection = uiModal(selection);
+         modalSelection.select('.modal').classed('modal-alert', true);
+         var section = modalSelection.select('.content');
+         section.append('div').attr('class', 'modal-section header');
+         section.append('div').attr('class', 'modal-section message-text');
+         var buttons = section.append('div').attr('class', 'modal-section buttons cf');
+
+         modalSelection.okButton = function () {
+           buttons.append('button').attr('class', 'button ok-button action').on('click.confirm', function () {
+             modalSelection.remove();
+           }).html(_t.html('confirm.okay')).node().focus();
+           return modalSelection;
+         };
 
-         if (arguments.length === 0) {
-           for (var precDigits = BufferOp.MAX_PRECISION_DIGITS; precDigits >= 0; precDigits--) {
-             try {
-               this$1.bufferReducedPrecision(precDigits);
-             } catch (ex) {
-               if (ex instanceof TopologyException) {
-                 this$1._saveException = ex;
-               } else { throw ex }
-             } finally {}
-             if (this$1._resultGeometry !== null) { return null }
-           }
-           throw this._saveException
-         } else if (arguments.length === 1) {
-           var precisionDigits = arguments[0];
-           var sizeBasedScaleFactor = BufferOp.precisionScaleFactor(this._argGeom, this._distance, precisionDigits);
-           var fixedPM = new PrecisionModel(sizeBasedScaleFactor);
-           this.bufferFixedPrecision(fixedPM);
-         }
-       };
-       BufferOp.prototype.computeGeometry = function computeGeometry () {
-         this.bufferOriginalPrecision();
-         if (this._resultGeometry !== null) { return null }
-         var argPM = this._argGeom.getFactory().getPrecisionModel();
-         if (argPM.getType() === PrecisionModel.FIXED) { this.bufferFixedPrecision(argPM); } else { this.bufferReducedPrecision(); }
-       };
-       BufferOp.prototype.setQuadrantSegments = function setQuadrantSegments (quadrantSegments) {
-         this._bufParams.setQuadrantSegments(quadrantSegments);
-       };
-       BufferOp.prototype.bufferOriginalPrecision = function bufferOriginalPrecision () {
-         try {
-           var bufBuilder = new BufferBuilder(this._bufParams);
-           this._resultGeometry = bufBuilder.buffer(this._argGeom, this._distance);
-         } catch (ex) {
-           if (ex instanceof RuntimeException) {
-             this._saveException = ex;
-           } else { throw ex }
-         } finally {}
-       };
-       BufferOp.prototype.getResultGeometry = function getResultGeometry (distance) {
-         this._distance = distance;
-         this.computeGeometry();
-         return this._resultGeometry
-       };
-       BufferOp.prototype.setEndCapStyle = function setEndCapStyle (endCapStyle) {
-         this._bufParams.setEndCapStyle(endCapStyle);
-       };
-       BufferOp.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       BufferOp.prototype.getClass = function getClass () {
-         return BufferOp
-       };
-       BufferOp.bufferOp = function bufferOp () {
-         if (arguments.length === 2) {
-           var g = arguments[0];
-           var distance = arguments[1];
-           var gBuf = new BufferOp(g);
-           var geomBuf = gBuf.getResultGeometry(distance);
-           return geomBuf
-         } else if (arguments.length === 3) {
-           if (Number.isInteger(arguments[2]) && (arguments[0] instanceof Geometry && typeof arguments[1] === 'number')) {
-             var g$1 = arguments[0];
-             var distance$1 = arguments[1];
-             var quadrantSegments = arguments[2];
-             var bufOp = new BufferOp(g$1);
-             bufOp.setQuadrantSegments(quadrantSegments);
-             var geomBuf$1 = bufOp.getResultGeometry(distance$1);
-             return geomBuf$1
-           } else if (arguments[2] instanceof BufferParameters && (arguments[0] instanceof Geometry && typeof arguments[1] === 'number')) {
-             var g$2 = arguments[0];
-             var distance$2 = arguments[1];
-             var params = arguments[2];
-             var bufOp$1 = new BufferOp(g$2, params);
-             var geomBuf$2 = bufOp$1.getResultGeometry(distance$2);
-             return geomBuf$2
-           }
-         } else if (arguments.length === 4) {
-           var g$3 = arguments[0];
-           var distance$3 = arguments[1];
-           var quadrantSegments$1 = arguments[2];
-           var endCapStyle = arguments[3];
-           var bufOp$2 = new BufferOp(g$3);
-           bufOp$2.setQuadrantSegments(quadrantSegments$1);
-           bufOp$2.setEndCapStyle(endCapStyle);
-           var geomBuf$3 = bufOp$2.getResultGeometry(distance$3);
-           return geomBuf$3
-         }
-       };
-       BufferOp.precisionScaleFactor = function precisionScaleFactor (g, distance, maxPrecisionDigits) {
-         var env = g.getEnvelopeInternal();
-         var envMax = MathUtil.max(Math.abs(env.getMaxX()), Math.abs(env.getMaxY()), Math.abs(env.getMinX()), Math.abs(env.getMinY()));
-         var expandByDistance = distance > 0.0 ? distance : 0.0;
-         var bufEnvMax = envMax + 2 * expandByDistance;
-         var bufEnvPrecisionDigits = Math.trunc(Math.log(bufEnvMax) / Math.log(10) + 1.0);
-         var minUnitLog10 = maxPrecisionDigits - bufEnvPrecisionDigits;
-         var scaleFactor = Math.pow(10.0, minUnitLog10);
-         return scaleFactor
-       };
-       staticAccessors$32.CAP_ROUND.get = function () { return BufferParameters.CAP_ROUND };
-       staticAccessors$32.CAP_BUTT.get = function () { return BufferParameters.CAP_FLAT };
-       staticAccessors$32.CAP_FLAT.get = function () { return BufferParameters.CAP_FLAT };
-       staticAccessors$32.CAP_SQUARE.get = function () { return BufferParameters.CAP_SQUARE };
-       staticAccessors$32.MAX_PRECISION_DIGITS.get = function () { return 12 };
-
-       Object.defineProperties( BufferOp, staticAccessors$32 );
-
-       var PointPairDistance = function PointPairDistance () {
-         this._pt = [new Coordinate(), new Coordinate()];
-         this._distance = Double.NaN;
-         this._isNull = true;
-       };
-       PointPairDistance.prototype.getCoordinates = function getCoordinates () {
-         return this._pt
-       };
-       PointPairDistance.prototype.getCoordinate = function getCoordinate (i) {
-         return this._pt[i]
-       };
-       PointPairDistance.prototype.setMinimum = function setMinimum () {
-         if (arguments.length === 1) {
-           var ptDist = arguments[0];
-           this.setMinimum(ptDist._pt[0], ptDist._pt[1]);
-         } else if (arguments.length === 2) {
-           var p0 = arguments[0];
-           var p1 = arguments[1];
-           if (this._isNull) {
-             this.initialize(p0, p1);
-             return null
-           }
-           var dist = p0.distance(p1);
-           if (dist < this._distance) { this.initialize(p0, p1, dist); }
-         }
-       };
-       PointPairDistance.prototype.initialize = function initialize () {
-         if (arguments.length === 0) {
-           this._isNull = true;
-         } else if (arguments.length === 2) {
-           var p0 = arguments[0];
-           var p1 = arguments[1];
-           this._pt[0].setCoordinate(p0);
-           this._pt[1].setCoordinate(p1);
-           this._distance = p0.distance(p1);
-           this._isNull = false;
-         } else if (arguments.length === 3) {
-           var p0$1 = arguments[0];
-           var p1$1 = arguments[1];
-           var distance = arguments[2];
-           this._pt[0].setCoordinate(p0$1);
-           this._pt[1].setCoordinate(p1$1);
-           this._distance = distance;
-           this._isNull = false;
-         }
-       };
-       PointPairDistance.prototype.getDistance = function getDistance () {
-         return this._distance
-       };
-       PointPairDistance.prototype.setMaximum = function setMaximum () {
-         if (arguments.length === 1) {
-           var ptDist = arguments[0];
-           this.setMaximum(ptDist._pt[0], ptDist._pt[1]);
-         } else if (arguments.length === 2) {
-           var p0 = arguments[0];
-           var p1 = arguments[1];
-           if (this._isNull) {
-             this.initialize(p0, p1);
-             return null
-           }
-           var dist = p0.distance(p1);
-           if (dist > this._distance) { this.initialize(p0, p1, dist); }
+         return modalSelection;
+       }
+
+       function uiChangesetEditor(context) {
+         var dispatch$1 = dispatch('change');
+         var formFields = uiFormFields(context);
+         var commentCombo = uiCombobox(context, 'comment').caseSensitive(true);
+
+         var _fieldsArr;
+
+         var _tags;
+
+         var _changesetID;
+
+         function changesetEditor(selection) {
+           render(selection);
          }
-       };
-       PointPairDistance.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       PointPairDistance.prototype.getClass = function getClass () {
-         return PointPairDistance
-       };
 
-       var DistanceToPointFinder = function DistanceToPointFinder () {};
+         function render(selection) {
+           var initial = false;
 
-       DistanceToPointFinder.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       DistanceToPointFinder.prototype.getClass = function getClass () {
-         return DistanceToPointFinder
-       };
-       DistanceToPointFinder.computeDistance = function computeDistance () {
-         if (arguments[2] instanceof PointPairDistance && (arguments[0] instanceof LineString && arguments[1] instanceof Coordinate)) {
-           var line = arguments[0];
-           var pt = arguments[1];
-           var ptDist = arguments[2];
-           var coords = line.getCoordinates();
-           var tempSegment = new LineSegment();
-           for (var i = 0; i < coords.length - 1; i++) {
-             tempSegment.setCoordinates(coords[i], coords[i + 1]);
-             var closestPt = tempSegment.closestPoint(pt);
-             ptDist.setMinimum(closestPt, pt);
-           }
-         } else if (arguments[2] instanceof PointPairDistance && (arguments[0] instanceof Polygon && arguments[1] instanceof Coordinate)) {
-           var poly = arguments[0];
-           var pt$1 = arguments[1];
-           var ptDist$1 = arguments[2];
-           DistanceToPointFinder.computeDistance(poly.getExteriorRing(), pt$1, ptDist$1);
-           for (var i$1 = 0; i$1 < poly.getNumInteriorRing(); i$1++) {
-             DistanceToPointFinder.computeDistance(poly.getInteriorRingN(i$1), pt$1, ptDist$1);
-           }
-         } else if (arguments[2] instanceof PointPairDistance && (arguments[0] instanceof Geometry && arguments[1] instanceof Coordinate)) {
-           var geom = arguments[0];
-           var pt$2 = arguments[1];
-           var ptDist$2 = arguments[2];
-           if (geom instanceof LineString) {
-             DistanceToPointFinder.computeDistance(geom, pt$2, ptDist$2);
-           } else if (geom instanceof Polygon) {
-             DistanceToPointFinder.computeDistance(geom, pt$2, ptDist$2);
-           } else if (geom instanceof GeometryCollection) {
-             var gc = geom;
-             for (var i$2 = 0; i$2 < gc.getNumGeometries(); i$2++) {
-               var g = gc.getGeometryN(i$2);
-               DistanceToPointFinder.computeDistance(g, pt$2, ptDist$2);
-             }
-           } else {
-             ptDist$2.setMinimum(geom.getCoordinate(), pt$2);
+           if (!_fieldsArr) {
+             initial = true;
+             var presets = _mainPresetIndex;
+             _fieldsArr = [uiField(context, presets.field('comment'), null, {
+               show: true,
+               revert: false
+             }), uiField(context, presets.field('source'), null, {
+               show: false,
+               revert: false
+             }), uiField(context, presets.field('hashtags'), null, {
+               show: false,
+               revert: false
+             })];
+
+             _fieldsArr.forEach(function (field) {
+               field.on('change', function (t, onInput) {
+                 dispatch$1.call('change', field, undefined, t, onInput);
+               });
+             });
            }
-         } else if (arguments[2] instanceof PointPairDistance && (arguments[0] instanceof LineSegment && arguments[1] instanceof Coordinate)) {
-           var segment = arguments[0];
-           var pt$3 = arguments[1];
-           var ptDist$3 = arguments[2];
-           var closestPt$1 = segment.closestPoint(pt$3);
-           ptDist$3.setMinimum(closestPt$1, pt$3);
+
+           _fieldsArr.forEach(function (field) {
+             field.tags(_tags);
+           });
+
+           selection.call(formFields.fieldsArr(_fieldsArr));
+
+           if (initial) {
+             var commentField = selection.select('.form-field-comment textarea');
+             var commentNode = commentField.node();
+
+             if (commentNode) {
+               commentNode.focus();
+               commentNode.select();
+             } // trigger a 'blur' event so that comment field can be cleaned
+             // and checked for hashtags, even if retrieved from localstorage
+
+
+             utilTriggerEvent(commentField, 'blur');
+             var osm = context.connection();
+
+             if (osm) {
+               osm.userChangesets(function (err, changesets) {
+                 if (err) return;
+                 var comments = changesets.map(function (changeset) {
+                   var comment = changeset.tags.comment;
+                   return comment ? {
+                     title: comment,
+                     value: comment
+                   } : null;
+                 }).filter(Boolean);
+                 commentField.call(commentCombo.data(utilArrayUniqBy(comments, 'title')));
+               });
+             }
+           } // Add warning if comment mentions Google
+
+
+           var hasGoogle = _tags.comment.match(/google/i);
+
+           var commentWarning = selection.select('.form-field-comment').selectAll('.comment-warning').data(hasGoogle ? [0] : []);
+           commentWarning.exit().transition().duration(200).style('opacity', 0).remove();
+           var commentEnter = commentWarning.enter().insert('div', '.tag-reference-body').attr('class', 'field-warning comment-warning').style('opacity', 0);
+           commentEnter.append('a').attr('target', '_blank').call(svgIcon('#iD-icon-alert', 'inline')).attr('href', _t('commit.google_warning_link')).append('span').html(_t.html('commit.google_warning'));
+           commentEnter.transition().duration(200).style('opacity', 1);
          }
-       };
 
-       var BufferCurveMaximumDistanceFinder = function BufferCurveMaximumDistanceFinder (inputGeom) {
-         this._maxPtDist = new PointPairDistance();
-         this._inputGeom = inputGeom || null;
-       };
+         changesetEditor.tags = function (_) {
+           if (!arguments.length) return _tags;
+           _tags = _; // Don't reset _fieldsArr here.
 
-       var staticAccessors$36 = { MaxPointDistanceFilter: { configurable: true },MaxMidpointDistanceFilter: { configurable: true } };
-       BufferCurveMaximumDistanceFinder.prototype.computeMaxMidpointDistance = function computeMaxMidpointDistance (curve) {
-         var distFilter = new MaxMidpointDistanceFilter(this._inputGeom);
-         curve.apply(distFilter);
-         this._maxPtDist.setMaximum(distFilter.getMaxPointDistance());
-       };
-       BufferCurveMaximumDistanceFinder.prototype.computeMaxVertexDistance = function computeMaxVertexDistance (curve) {
-         var distFilter = new MaxPointDistanceFilter(this._inputGeom);
-         curve.apply(distFilter);
-         this._maxPtDist.setMaximum(distFilter.getMaxPointDistance());
-       };
-       BufferCurveMaximumDistanceFinder.prototype.findDistance = function findDistance (bufferCurve) {
-         this.computeMaxVertexDistance(bufferCurve);
-         this.computeMaxMidpointDistance(bufferCurve);
-         return this._maxPtDist.getDistance()
-       };
-       BufferCurveMaximumDistanceFinder.prototype.getDistancePoints = function getDistancePoints () {
-         return this._maxPtDist
-       };
-       BufferCurveMaximumDistanceFinder.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       BufferCurveMaximumDistanceFinder.prototype.getClass = function getClass () {
-         return BufferCurveMaximumDistanceFinder
-       };
-       staticAccessors$36.MaxPointDistanceFilter.get = function () { return MaxPointDistanceFilter };
-       staticAccessors$36.MaxMidpointDistanceFilter.get = function () { return MaxMidpointDistanceFilter };
+           return changesetEditor;
+         };
 
-       Object.defineProperties( BufferCurveMaximumDistanceFinder, staticAccessors$36 );
+         changesetEditor.changesetID = function (_) {
+           if (!arguments.length) return _changesetID;
+           if (_changesetID === _) return changesetEditor;
+           _changesetID = _;
+           _fieldsArr = null;
+           return changesetEditor;
+         };
 
-       var MaxPointDistanceFilter = function MaxPointDistanceFilter (geom) {
-         this._maxPtDist = new PointPairDistance();
-         this._minPtDist = new PointPairDistance();
-         this._geom = geom || null;
-       };
-       MaxPointDistanceFilter.prototype.filter = function filter (pt) {
-         this._minPtDist.initialize();
-         DistanceToPointFinder.computeDistance(this._geom, pt, this._minPtDist);
-         this._maxPtDist.setMaximum(this._minPtDist);
-       };
-       MaxPointDistanceFilter.prototype.getMaxPointDistance = function getMaxPointDistance () {
-         return this._maxPtDist
-       };
-       MaxPointDistanceFilter.prototype.interfaces_ = function interfaces_ () {
-         return [CoordinateFilter]
-       };
-       MaxPointDistanceFilter.prototype.getClass = function getClass () {
-         return MaxPointDistanceFilter
-       };
+         return utilRebind(changesetEditor, dispatch$1, 'on');
+       }
 
-       var MaxMidpointDistanceFilter = function MaxMidpointDistanceFilter (geom) {
-         this._maxPtDist = new PointPairDistance();
-         this._minPtDist = new PointPairDistance();
-         this._geom = geom || null;
-       };
-       MaxMidpointDistanceFilter.prototype.filter = function filter (seq, index) {
-         if (index === 0) { return null }
-         var p0 = seq.getCoordinate(index - 1);
-         var p1 = seq.getCoordinate(index);
-         var midPt = new Coordinate((p0.x + p1.x) / 2, (p0.y + p1.y) / 2);
-         this._minPtDist.initialize();
-         DistanceToPointFinder.computeDistance(this._geom, midPt, this._minPtDist);
-         this._maxPtDist.setMaximum(this._minPtDist);
-       };
-       MaxMidpointDistanceFilter.prototype.isDone = function isDone () {
-         return false
-       };
-       MaxMidpointDistanceFilter.prototype.isGeometryChanged = function isGeometryChanged () {
-         return false
-       };
-       MaxMidpointDistanceFilter.prototype.getMaxPointDistance = function getMaxPointDistance () {
-         return this._maxPtDist
-       };
-       MaxMidpointDistanceFilter.prototype.interfaces_ = function interfaces_ () {
-         return [CoordinateSequenceFilter]
-       };
-       MaxMidpointDistanceFilter.prototype.getClass = function getClass () {
-         return MaxMidpointDistanceFilter
-       };
+       function uiSectionChanges(context) {
+         var detected = utilDetect();
+         var _discardTags = {};
+         _mainFileFetcher.get('discarded').then(function (d) {
+           _discardTags = d;
+         })["catch"](function () {
+           /* ignore */
+         });
+         var section = uiSection('changes-list', context).label(function () {
+           var history = context.history();
+           var summary = history.difference().summary();
+           return _t('inspector.title_count', {
+             title: _t.html('commit.changes'),
+             count: summary.length
+           });
+         }).disclosureContent(renderDisclosureContent);
 
-       var PolygonExtracter = function PolygonExtracter (comps) {
-         this._comps = comps || null;
-       };
-       PolygonExtracter.prototype.filter = function filter (geom) {
-         if (geom instanceof Polygon) { this._comps.add(geom); }
-       };
-       PolygonExtracter.prototype.interfaces_ = function interfaces_ () {
-         return [GeometryFilter]
-       };
-       PolygonExtracter.prototype.getClass = function getClass () {
-         return PolygonExtracter
-       };
-       PolygonExtracter.getPolygons = function getPolygons () {
-         if (arguments.length === 1) {
-           var geom = arguments[0];
-           return PolygonExtracter.getPolygons(geom, new ArrayList())
-         } else if (arguments.length === 2) {
-           var geom$1 = arguments[0];
-           var list = arguments[1];
-           if (geom$1 instanceof Polygon) {
-             list.add(geom$1);
-           } else if (geom$1 instanceof GeometryCollection) {
-             geom$1.apply(new PolygonExtracter(list));
-           }
-           return list
-         }
-       };
+         function renderDisclosureContent(selection) {
+           var history = context.history();
+           var summary = history.difference().summary();
+           var container = selection.selectAll('.commit-section').data([0]);
+           var containerEnter = container.enter().append('div').attr('class', 'commit-section');
+           containerEnter.append('ul').attr('class', 'changeset-list');
+           container = containerEnter.merge(container);
+           var items = container.select('ul').selectAll('li').data(summary);
+           var itemsEnter = items.enter().append('li').attr('class', 'change-item');
+           var buttons = itemsEnter.append('button').on('mouseover', mouseover).on('mouseout', mouseout).on('click', click);
+           buttons.each(function (d) {
+             select(this).call(svgIcon('#iD-icon-' + d.entity.geometry(d.graph), 'pre-text ' + d.changeType));
+           });
+           buttons.append('span').attr('class', 'change-type').html(function (d) {
+             return _t.html('commit.' + d.changeType) + ' ';
+           });
+           buttons.append('strong').attr('class', 'entity-type').html(function (d) {
+             var matched = _mainPresetIndex.match(d.entity, d.graph);
+             return matched && matched.name() || utilDisplayType(d.entity.id);
+           });
+           buttons.append('span').attr('class', 'entity-name').html(function (d) {
+             var name = utilDisplayName(d.entity) || '',
+                 string = '';
 
-       var LinearComponentExtracter = function LinearComponentExtracter () {
-         this._lines = null;
-         this._isForcedToLineString = false;
-         if (arguments.length === 1) {
-           var lines = arguments[0];
-           this._lines = lines;
-         } else if (arguments.length === 2) {
-           var lines$1 = arguments[0];
-           var isForcedToLineString = arguments[1];
-           this._lines = lines$1;
-           this._isForcedToLineString = isForcedToLineString;
-         }
-       };
-       LinearComponentExtracter.prototype.filter = function filter (geom) {
-         if (this._isForcedToLineString && geom instanceof LinearRing) {
-           var line = geom.getFactory().createLineString(geom.getCoordinateSequence());
-           this._lines.add(line);
-           return null
-         }
-         if (geom instanceof LineString) { this._lines.add(geom); }
-       };
-       LinearComponentExtracter.prototype.setForceToLineString = function setForceToLineString (isForcedToLineString) {
-         this._isForcedToLineString = isForcedToLineString;
-       };
-       LinearComponentExtracter.prototype.interfaces_ = function interfaces_ () {
-         return [GeometryComponentFilter]
-       };
-       LinearComponentExtracter.prototype.getClass = function getClass () {
-         return LinearComponentExtracter
-       };
-       LinearComponentExtracter.getGeometry = function getGeometry () {
-         if (arguments.length === 1) {
-           var geom = arguments[0];
-           return geom.getFactory().buildGeometry(LinearComponentExtracter.getLines(geom))
-         } else if (arguments.length === 2) {
-           var geom$1 = arguments[0];
-           var forceToLineString = arguments[1];
-           return geom$1.getFactory().buildGeometry(LinearComponentExtracter.getLines(geom$1, forceToLineString))
-         }
-       };
-       LinearComponentExtracter.getLines = function getLines () {
-         if (arguments.length === 1) {
-           var geom = arguments[0];
-           return LinearComponentExtracter.getLines(geom, false)
-         } else if (arguments.length === 2) {
-           if (hasInterface(arguments[0], Collection) && hasInterface(arguments[1], Collection)) {
-             var geoms = arguments[0];
-             var lines$1 = arguments[1];
-             for (var i = geoms.iterator(); i.hasNext();) {
-               var g = i.next();
-               LinearComponentExtracter.getLines(g, lines$1);
-             }
-             return lines$1
-           } else if (arguments[0] instanceof Geometry && typeof arguments[1] === 'boolean') {
-             var geom$1 = arguments[0];
-             var forceToLineString = arguments[1];
-             var lines = new ArrayList();
-             geom$1.apply(new LinearComponentExtracter(lines, forceToLineString));
-             return lines
-           } else if (arguments[0] instanceof Geometry && hasInterface(arguments[1], Collection)) {
-             var geom$2 = arguments[0];
-             var lines$2 = arguments[1];
-             if (geom$2 instanceof LineString) {
-               lines$2.add(geom$2);
-             } else {
-               geom$2.apply(new LinearComponentExtracter(lines$2));
+             if (name !== '') {
+               string += ':';
+             }
+
+             return string += ' ' + name;
+           });
+           items = itemsEnter.merge(items); // Download changeset link
+
+           var changeset = new osmChangeset().update({
+             id: undefined
+           });
+           var changes = history.changes(actionDiscardTags(history.difference(), _discardTags));
+           delete changeset.id; // Export without chnageset_id
+
+           var data = JXON.stringify(changeset.osmChangeJXON(changes));
+           var blob = new Blob([data], {
+             type: 'text/xml;charset=utf-8;'
+           });
+           var fileName = 'changes.osc';
+           var linkEnter = container.selectAll('.download-changes').data([0]).enter().append('a').attr('class', 'download-changes');
+
+           if (detected.download) {
+             // All except IE11 and Edge
+             linkEnter // download the data as a file
+             .attr('href', window.URL.createObjectURL(blob)).attr('download', fileName);
+           } else {
+             // IE11 and Edge
+             linkEnter // open data uri in a new tab
+             .attr('target', '_blank').on('click.download', function () {
+               navigator.msSaveBlob(blob, fileName);
+             });
+           }
+
+           linkEnter.call(svgIcon('#iD-icon-load', 'inline')).append('span').html(_t.html('commit.download_changes'));
+
+           function mouseover(d) {
+             if (d.entity) {
+               context.surface().selectAll(utilEntityOrMemberSelector([d.entity.id], context.graph())).classed('hover', true);
              }
-             return lines$2
            }
-         } else if (arguments.length === 3) {
-           if (typeof arguments[2] === 'boolean' && (hasInterface(arguments[0], Collection) && hasInterface(arguments[1], Collection))) {
-             var geoms$1 = arguments[0];
-             var lines$3 = arguments[1];
-             var forceToLineString$1 = arguments[2];
-             for (var i$1 = geoms$1.iterator(); i$1.hasNext();) {
-               var g$1 = i$1.next();
-               LinearComponentExtracter.getLines(g$1, lines$3, forceToLineString$1);
+
+           function mouseout() {
+             context.surface().selectAll('.hover').classed('hover', false);
+           }
+
+           function click(d3_event, change) {
+             if (change.changeType !== 'deleted') {
+               var entity = change.entity;
+               context.map().zoomToEase(entity);
+               context.surface().selectAll(utilEntityOrMemberSelector([entity.id], context.graph())).classed('hover', true);
              }
-             return lines$3
-           } else if (typeof arguments[2] === 'boolean' && (arguments[0] instanceof Geometry && hasInterface(arguments[1], Collection))) {
-             var geom$3 = arguments[0];
-             var lines$4 = arguments[1];
-             var forceToLineString$2 = arguments[2];
-             geom$3.apply(new LinearComponentExtracter(lines$4, forceToLineString$2));
-             return lines$4
            }
          }
-       };
 
-       var PointLocator = function PointLocator () {
-         this._boundaryRule = BoundaryNodeRule.OGC_SFS_BOUNDARY_RULE;
-         this._isIn = null;
-         this._numBoundaries = null;
-         if (arguments.length === 0) ; else if (arguments.length === 1) {
-           var boundaryRule = arguments[0];
-           if (boundaryRule === null) { throw new IllegalArgumentException('Rule must be non-null') }
-           this._boundaryRule = boundaryRule;
-         }
-       };
-       PointLocator.prototype.locateInternal = function locateInternal () {
-           var this$1 = this;
-
-         if (arguments[0] instanceof Coordinate && arguments[1] instanceof Polygon) {
-           var p = arguments[0];
-           var poly = arguments[1];
-           if (poly.isEmpty()) { return Location.EXTERIOR }
-           var shell = poly.getExteriorRing();
-           var shellLoc = this.locateInPolygonRing(p, shell);
-           if (shellLoc === Location.EXTERIOR) { return Location.EXTERIOR }
-           if (shellLoc === Location.BOUNDARY) { return Location.BOUNDARY }
-           for (var i = 0; i < poly.getNumInteriorRing(); i++) {
-             var hole = poly.getInteriorRingN(i);
-             var holeLoc = this$1.locateInPolygonRing(p, hole);
-             if (holeLoc === Location.INTERIOR) { return Location.EXTERIOR }
-             if (holeLoc === Location.BOUNDARY) { return Location.BOUNDARY }
-           }
-           return Location.INTERIOR
-         } else if (arguments[0] instanceof Coordinate && arguments[1] instanceof LineString) {
-           var p$1 = arguments[0];
-           var l = arguments[1];
-           if (!l.getEnvelopeInternal().intersects(p$1)) { return Location.EXTERIOR }
-           var pt = l.getCoordinates();
-           if (!l.isClosed()) {
-             if (p$1.equals(pt[0]) || p$1.equals(pt[pt.length - 1])) {
-               return Location.BOUNDARY
-             }
-           }
-           if (CGAlgorithms.isOnLine(p$1, pt)) { return Location.INTERIOR }
-           return Location.EXTERIOR
-         } else if (arguments[0] instanceof Coordinate && arguments[1] instanceof Point$1) {
-           var p$2 = arguments[0];
-           var pt$1 = arguments[1];
-           var ptCoord = pt$1.getCoordinate();
-           if (ptCoord.equals2D(p$2)) { return Location.INTERIOR }
-           return Location.EXTERIOR
-         }
-       };
-       PointLocator.prototype.locateInPolygonRing = function locateInPolygonRing (p, ring) {
-         if (!ring.getEnvelopeInternal().intersects(p)) { return Location.EXTERIOR }
-         return CGAlgorithms.locatePointInRing(p, ring.getCoordinates())
-       };
-       PointLocator.prototype.intersects = function intersects (p, geom) {
-         return this.locate(p, geom) !== Location.EXTERIOR
-       };
-       PointLocator.prototype.updateLocationInfo = function updateLocationInfo (loc) {
-         if (loc === Location.INTERIOR) { this._isIn = true; }
-         if (loc === Location.BOUNDARY) { this._numBoundaries++; }
-       };
-       PointLocator.prototype.computeLocation = function computeLocation (p, geom) {
-           var this$1 = this;
-
-         if (geom instanceof Point$1) {
-           this.updateLocationInfo(this.locateInternal(p, geom));
-         }
-         if (geom instanceof LineString) {
-           this.updateLocationInfo(this.locateInternal(p, geom));
-         } else if (geom instanceof Polygon) {
-           this.updateLocationInfo(this.locateInternal(p, geom));
-         } else if (geom instanceof MultiLineString) {
-           var ml = geom;
-           for (var i = 0; i < ml.getNumGeometries(); i++) {
-             var l = ml.getGeometryN(i);
-             this$1.updateLocationInfo(this$1.locateInternal(p, l));
-           }
-         } else if (geom instanceof MultiPolygon) {
-           var mpoly = geom;
-           for (var i$1 = 0; i$1 < mpoly.getNumGeometries(); i$1++) {
-             var poly = mpoly.getGeometryN(i$1);
-             this$1.updateLocationInfo(this$1.locateInternal(p, poly));
-           }
-         } else if (geom instanceof GeometryCollection) {
-           var geomi = new GeometryCollectionIterator(geom);
-           while (geomi.hasNext()) {
-             var g2 = geomi.next();
-             if (g2 !== geom) { this$1.computeLocation(p, g2); }
+         return section;
+       }
+
+       function uiCommitWarnings(context) {
+         function commitWarnings(selection) {
+           var issuesBySeverity = context.validator().getIssuesBySeverity({
+             what: 'edited',
+             where: 'all',
+             includeDisabledRules: true
+           });
+
+           for (var severity in issuesBySeverity) {
+             var issues = issuesBySeverity[severity];
+             var section = severity + '-section';
+             var issueItem = severity + '-item';
+             var container = selection.selectAll('.' + section).data(issues.length ? [0] : []);
+             container.exit().remove();
+             var containerEnter = container.enter().append('div').attr('class', 'modal-section ' + section + ' fillL2');
+             containerEnter.append('h3').html(severity === 'warning' ? _t.html('commit.warnings') : _t.html('commit.errors'));
+             containerEnter.append('ul').attr('class', 'changeset-list');
+             container = containerEnter.merge(container);
+             var items = container.select('ul').selectAll('li').data(issues, function (d) {
+               return d.id;
+             });
+             items.exit().remove();
+             var itemsEnter = items.enter().append('li').attr('class', issueItem);
+             var buttons = itemsEnter.append('button').on('mouseover', function (d3_event, d) {
+               if (d.entityIds) {
+                 context.surface().selectAll(utilEntityOrMemberSelector(d.entityIds, context.graph())).classed('hover', true);
+               }
+             }).on('mouseout', function () {
+               context.surface().selectAll('.hover').classed('hover', false);
+             }).on('click', function (d3_event, d) {
+               context.validator().focusIssue(d);
+             });
+             buttons.call(svgIcon('#iD-icon-alert', 'pre-text'));
+             buttons.append('strong').attr('class', 'issue-message');
+             buttons.filter(function (d) {
+               return d.tooltip;
+             }).call(uiTooltip().title(function (d) {
+               return d.tooltip;
+             }).placement('top'));
+             items = itemsEnter.merge(items);
+             items.selectAll('.issue-message').html(function (d) {
+               return d.message(context);
+             });
            }
          }
-       };
-       PointLocator.prototype.locate = function locate (p, geom) {
-         if (geom.isEmpty()) { return Location.EXTERIOR }
-         if (geom instanceof LineString) {
-           return this.locateInternal(p, geom)
-         } else if (geom instanceof Polygon) {
-           return this.locateInternal(p, geom)
-         }
-         this._isIn = false;
-         this._numBoundaries = 0;
-         this.computeLocation(p, geom);
-         if (this._boundaryRule.isInBoundary(this._numBoundaries)) { return Location.BOUNDARY }
-         if (this._numBoundaries > 0 || this._isIn) { return Location.INTERIOR }
-         return Location.EXTERIOR
-       };
-       PointLocator.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       PointLocator.prototype.getClass = function getClass () {
-         return PointLocator
-       };
 
-       var GeometryLocation = function GeometryLocation () {
-         this._component = null;
-         this._segIndex = null;
-         this._pt = null;
-         if (arguments.length === 2) {
-           var component = arguments[0];
-           var pt = arguments[1];
-           GeometryLocation.call(this, component, GeometryLocation.INSIDE_AREA, pt);
-         } else if (arguments.length === 3) {
-           var component$1 = arguments[0];
-           var segIndex = arguments[1];
-           var pt$1 = arguments[2];
-           this._component = component$1;
-           this._segIndex = segIndex;
-           this._pt = pt$1;
+         return commitWarnings;
+       }
+
+       var readOnlyTags = [/^changesets_count$/, /^created_by$/, /^ideditor:/, /^imagery_used$/, /^host$/, /^locale$/, /^warnings:/, /^resolved:/, /^closed:note$/, /^closed:keepright$/, /^closed:improveosm:/, /^closed:osmose:/]; // treat most punctuation (except -, _, +, &) as hashtag delimiters - #4398
+       // from https://stackoverflow.com/a/25575009
+
+       var hashtagRegex = /(#[^\u2000-\u206F\u2E00-\u2E7F\s\\'!"#$%()*,.\/:;<=>?@\[\]^`{|}~]+)/g;
+       function uiCommit(context) {
+         var dispatch$1 = dispatch('cancel');
+
+         var _userDetails;
+
+         var _selection;
+
+         var changesetEditor = uiChangesetEditor(context).on('change', changeTags);
+         var rawTagEditor = uiSectionRawTagEditor('changeset-tag-editor', context).on('change', changeTags).readOnlyTags(readOnlyTags);
+         var commitChanges = uiSectionChanges(context);
+         var commitWarnings = uiCommitWarnings(context);
+
+         function commit(selection) {
+           _selection = selection; // Initialize changeset if one does not exist yet.
+
+           if (!context.changeset) initChangeset();
+           loadDerivedChangesetTags();
+           selection.call(render);
          }
-       };
 
-       var staticAccessors$38 = { INSIDE_AREA: { configurable: true } };
-       GeometryLocation.prototype.isInsideArea = function isInsideArea () {
-         return this._segIndex === GeometryLocation.INSIDE_AREA
-       };
-       GeometryLocation.prototype.getCoordinate = function getCoordinate () {
-         return this._pt
-       };
-       GeometryLocation.prototype.getGeometryComponent = function getGeometryComponent () {
-         return this._component
-       };
-       GeometryLocation.prototype.getSegmentIndex = function getSegmentIndex () {
-         return this._segIndex
-       };
-       GeometryLocation.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       GeometryLocation.prototype.getClass = function getClass () {
-         return GeometryLocation
-       };
-       staticAccessors$38.INSIDE_AREA.get = function () { return -1 };
+         function initChangeset() {
+           // expire stored comment, hashtags, source after cutoff datetime - #3947 #4899
+           var commentDate = +corePreferences('commentDate') || 0;
+           var currDate = Date.now();
+           var cutoff = 2 * 86400 * 1000; // 2 days
 
-       Object.defineProperties( GeometryLocation, staticAccessors$38 );
+           if (commentDate > currDate || currDate - commentDate > cutoff) {
+             corePreferences('comment', null);
+             corePreferences('hashtags', null);
+             corePreferences('source', null);
+           } // load in explicitly-set values, if any
 
-       var PointExtracter = function PointExtracter (pts) {
-         this._pts = pts || null;
-       };
-       PointExtracter.prototype.filter = function filter (geom) {
-         if (geom instanceof Point$1) { this._pts.add(geom); }
-       };
-       PointExtracter.prototype.interfaces_ = function interfaces_ () {
-         return [GeometryFilter]
-       };
-       PointExtracter.prototype.getClass = function getClass () {
-         return PointExtracter
-       };
-       PointExtracter.getPoints = function getPoints () {
-         if (arguments.length === 1) {
-           var geom = arguments[0];
-           if (geom instanceof Point$1) {
-             return Collections.singletonList(geom)
+
+           if (context.defaultChangesetComment()) {
+             corePreferences('comment', context.defaultChangesetComment());
+             corePreferences('commentDate', Date.now());
            }
-           return PointExtracter.getPoints(geom, new ArrayList())
-         } else if (arguments.length === 2) {
-           var geom$1 = arguments[0];
-           var list = arguments[1];
-           if (geom$1 instanceof Point$1) {
-             list.add(geom$1);
-           } else if (geom$1 instanceof GeometryCollection) {
-             geom$1.apply(new PointExtracter(list));
+
+           if (context.defaultChangesetSource()) {
+             corePreferences('source', context.defaultChangesetSource());
+             corePreferences('commentDate', Date.now());
            }
-           return list
-         }
-       };
 
-       var ConnectedElementLocationFilter = function ConnectedElementLocationFilter () {
-         this._locations = null;
-         var locations = arguments[0];
-         this._locations = locations;
-       };
-       ConnectedElementLocationFilter.prototype.filter = function filter (geom) {
-         if (geom instanceof Point$1 || geom instanceof LineString || geom instanceof Polygon) { this._locations.add(new GeometryLocation(geom, 0, geom.getCoordinate())); }
-       };
-       ConnectedElementLocationFilter.prototype.interfaces_ = function interfaces_ () {
-         return [GeometryFilter]
-       };
-       ConnectedElementLocationFilter.prototype.getClass = function getClass () {
-         return ConnectedElementLocationFilter
-       };
-       ConnectedElementLocationFilter.getLocations = function getLocations (geom) {
-         var locations = new ArrayList();
-         geom.apply(new ConnectedElementLocationFilter(locations));
-         return locations
-       };
+           if (context.defaultChangesetHashtags()) {
+             corePreferences('hashtags', context.defaultChangesetHashtags());
+             corePreferences('commentDate', Date.now());
+           }
 
-       var DistanceOp = function DistanceOp () {
-         this._geom = null;
-         this._terminateDistance = 0.0;
-         this._ptLocator = new PointLocator();
-         this._minDistanceLocation = null;
-         this._minDistance = Double.MAX_VALUE;
-         if (arguments.length === 2) {
-           var g0 = arguments[0];
-           var g1 = arguments[1];
-           this._geom = [g0, g1];
-           this._terminateDistance = 0.0;
-         } else if (arguments.length === 3) {
-           var g0$1 = arguments[0];
-           var g1$1 = arguments[1];
-           var terminateDistance = arguments[2];
-           this._geom = new Array(2).fill(null);
-           this._geom[0] = g0$1;
-           this._geom[1] = g1$1;
-           this._terminateDistance = terminateDistance;
-         }
-       };
-       DistanceOp.prototype.computeContainmentDistance = function computeContainmentDistance () {
-           var this$1 = this;
-
-         if (arguments.length === 0) {
-           var locPtPoly = new Array(2).fill(null);
-           this.computeContainmentDistance(0, locPtPoly);
-           if (this._minDistance <= this._terminateDistance) { return null }
-           this.computeContainmentDistance(1, locPtPoly);
-         } else if (arguments.length === 2) {
-           var polyGeomIndex = arguments[0];
-           var locPtPoly$1 = arguments[1];
-           var locationsIndex = 1 - polyGeomIndex;
-           var polys = PolygonExtracter.getPolygons(this._geom[polyGeomIndex]);
-           if (polys.size() > 0) {
-             var insideLocs = ConnectedElementLocationFilter.getLocations(this._geom[locationsIndex]);
-             this.computeContainmentDistance(insideLocs, polys, locPtPoly$1);
-             if (this._minDistance <= this._terminateDistance) {
-               this._minDistanceLocation[locationsIndex] = locPtPoly$1[0];
-               this._minDistanceLocation[polyGeomIndex] = locPtPoly$1[1];
-               return null
-             }
-           }
-         } else if (arguments.length === 3) {
-           if (arguments[2] instanceof Array && (hasInterface(arguments[0], List) && hasInterface(arguments[1], List))) {
-             var locs = arguments[0];
-             var polys$1 = arguments[1];
-             var locPtPoly$2 = arguments[2];
-             for (var i = 0; i < locs.size(); i++) {
-               var loc = locs.get(i);
-               for (var j = 0; j < polys$1.size(); j++) {
-                 this$1.computeContainmentDistance(loc, polys$1.get(j), locPtPoly$2);
-                 if (this$1._minDistance <= this$1._terminateDistance) { return null }
-               }
-             }
-           } else if (arguments[2] instanceof Array && (arguments[0] instanceof GeometryLocation && arguments[1] instanceof Polygon)) {
-             var ptLoc = arguments[0];
-             var poly = arguments[1];
-             var locPtPoly$3 = arguments[2];
-             var pt = ptLoc.getCoordinate();
-             if (Location.EXTERIOR !== this._ptLocator.locate(pt, poly)) {
-               this._minDistance = 0.0;
-               locPtPoly$3[0] = ptLoc;
-               locPtPoly$3[1] = new GeometryLocation(poly, pt);
-
-               return null
-             }
+           var detected = utilDetect();
+           var tags = {
+             comment: corePreferences('comment') || '',
+             created_by: context.cleanTagValue('iD ' + context.version),
+             host: context.cleanTagValue(detected.host),
+             locale: context.cleanTagValue(_mainLocalizer.localeCode())
+           }; // call findHashtags initially - this will remove stored
+           // hashtags if any hashtags are found in the comment - #4304
+
+           findHashtags(tags, true);
+           var hashtags = corePreferences('hashtags');
+
+           if (hashtags) {
+             tags.hashtags = hashtags;
            }
-         }
-       };
-       DistanceOp.prototype.computeMinDistanceLinesPoints = function computeMinDistanceLinesPoints (lines, points, locGeom) {
-           var this$1 = this;
 
-         for (var i = 0; i < lines.size(); i++) {
-           var line = lines.get(i);
-           for (var j = 0; j < points.size(); j++) {
-             var pt = points.get(j);
-             this$1.computeMinDistance(line, pt, locGeom);
-             if (this$1._minDistance <= this$1._terminateDistance) { return null }
+           var source = corePreferences('source');
+
+           if (source) {
+             tags.source = source;
            }
-         }
-       };
-       DistanceOp.prototype.computeFacetDistance = function computeFacetDistance () {
-         var locGeom = new Array(2).fill(null);
-         var lines0 = LinearComponentExtracter.getLines(this._geom[0]);
-         var lines1 = LinearComponentExtracter.getLines(this._geom[1]);
-         var pts0 = PointExtracter.getPoints(this._geom[0]);
-         var pts1 = PointExtracter.getPoints(this._geom[1]);
-         this.computeMinDistanceLines(lines0, lines1, locGeom);
-         this.updateMinDistance(locGeom, false);
-         if (this._minDistance <= this._terminateDistance) { return null }
-         locGeom[0] = null;
-         locGeom[1] = null;
-         this.computeMinDistanceLinesPoints(lines0, pts1, locGeom);
-         this.updateMinDistance(locGeom, false);
-         if (this._minDistance <= this._terminateDistance) { return null }
-         locGeom[0] = null;
-         locGeom[1] = null;
-         this.computeMinDistanceLinesPoints(lines1, pts0, locGeom);
-         this.updateMinDistance(locGeom, true);
-         if (this._minDistance <= this._terminateDistance) { return null }
-         locGeom[0] = null;
-         locGeom[1] = null;
-         this.computeMinDistancePoints(pts0, pts1, locGeom);
-         this.updateMinDistance(locGeom, false);
-       };
-       DistanceOp.prototype.nearestLocations = function nearestLocations () {
-         this.computeMinDistance();
-         return this._minDistanceLocation
-       };
-       DistanceOp.prototype.updateMinDistance = function updateMinDistance (locGeom, flip) {
-         if (locGeom[0] === null) { return null }
-         if (flip) {
-           this._minDistanceLocation[0] = locGeom[1];
-           this._minDistanceLocation[1] = locGeom[0];
-         } else {
-           this._minDistanceLocation[0] = locGeom[0];
-           this._minDistanceLocation[1] = locGeom[1];
-         }
-       };
-       DistanceOp.prototype.nearestPoints = function nearestPoints () {
-         this.computeMinDistance();
-         var nearestPts = [this._minDistanceLocation[0].getCoordinate(), this._minDistanceLocation[1].getCoordinate()];
-         return nearestPts
-       };
-       DistanceOp.prototype.computeMinDistance = function computeMinDistance () {
-           var this$1 = this;
-
-         if (arguments.length === 0) {
-           if (this._minDistanceLocation !== null) { return null }
-           this._minDistanceLocation = new Array(2).fill(null);
-           this.computeContainmentDistance();
-           if (this._minDistance <= this._terminateDistance) { return null }
-           this.computeFacetDistance();
-         } else if (arguments.length === 3) {
-           if (arguments[2] instanceof Array && (arguments[0] instanceof LineString && arguments[1] instanceof Point$1)) {
-             var line = arguments[0];
-             var pt = arguments[1];
-             var locGeom = arguments[2];
-             if (line.getEnvelopeInternal().distance(pt.getEnvelopeInternal()) > this._minDistance) { return null }
-             var coord0 = line.getCoordinates();
-             var coord = pt.getCoordinate();
-             for (var i = 0; i < coord0.length - 1; i++) {
-               var dist = CGAlgorithms.distancePointLine(coord, coord0[i], coord0[i + 1]);
-               if (dist < this$1._minDistance) {
-                 this$1._minDistance = dist;
-                 var seg = new LineSegment(coord0[i], coord0[i + 1]);
-                 var segClosestPoint = seg.closestPoint(coord);
-                 locGeom[0] = new GeometryLocation(line, i, segClosestPoint);
-                 locGeom[1] = new GeometryLocation(pt, 0, coord);
-               }
-               if (this$1._minDistance <= this$1._terminateDistance) { return null }
-             }
-           } else if (arguments[2] instanceof Array && (arguments[0] instanceof LineString && arguments[1] instanceof LineString)) {
-             var line0 = arguments[0];
-             var line1 = arguments[1];
-             var locGeom$1 = arguments[2];
-             if (line0.getEnvelopeInternal().distance(line1.getEnvelopeInternal()) > this._minDistance) { return null }
-             var coord0$1 = line0.getCoordinates();
-             var coord1 = line1.getCoordinates();
-             for (var i$1 = 0; i$1 < coord0$1.length - 1; i$1++) {
-               for (var j = 0; j < coord1.length - 1; j++) {
-                 var dist$1 = CGAlgorithms.distanceLineLine(coord0$1[i$1], coord0$1[i$1 + 1], coord1[j], coord1[j + 1]);
-                 if (dist$1 < this$1._minDistance) {
-                   this$1._minDistance = dist$1;
-                   var seg0 = new LineSegment(coord0$1[i$1], coord0$1[i$1 + 1]);
-                   var seg1 = new LineSegment(coord1[j], coord1[j + 1]);
-                   var closestPt = seg0.closestPoints(seg1);
-                   locGeom$1[0] = new GeometryLocation(line0, i$1, closestPt[0]);
-                   locGeom$1[1] = new GeometryLocation(line1, j, closestPt[1]);
-                 }
-                 if (this$1._minDistance <= this$1._terminateDistance) { return null }
+
+           var photoOverlaysUsed = context.history().photoOverlaysUsed();
+
+           if (photoOverlaysUsed.length) {
+             var sources = (tags.source || '').split(';'); // include this tag for any photo layer
+
+             if (sources.indexOf('streetlevel imagery') === -1) {
+               sources.push('streetlevel imagery');
+             } // add the photo overlays used during editing as sources
+
+
+             photoOverlaysUsed.forEach(function (photoOverlay) {
+               if (sources.indexOf(photoOverlay) === -1) {
+                 sources.push(photoOverlay);
                }
-             }
+             });
+             tags.source = context.cleanTagValue(sources.join(';'));
            }
-         }
-       };
-       DistanceOp.prototype.computeMinDistancePoints = function computeMinDistancePoints (points0, points1, locGeom) {
-           var this$1 = this;
 
-         for (var i = 0; i < points0.size(); i++) {
-           var pt0 = points0.get(i);
-           for (var j = 0; j < points1.size(); j++) {
-             var pt1 = points1.get(j);
-             var dist = pt0.getCoordinate().distance(pt1.getCoordinate());
-             if (dist < this$1._minDistance) {
-               this$1._minDistance = dist;
-               locGeom[0] = new GeometryLocation(pt0, 0, pt0.getCoordinate());
-               locGeom[1] = new GeometryLocation(pt1, 0, pt1.getCoordinate());
+           context.changeset = new osmChangeset({
+             tags: tags
+           });
+         } // Calculates read-only metadata tags based on the user's editing session and applies
+         // them to the changeset.
+
+
+         function loadDerivedChangesetTags() {
+           var osm = context.connection();
+           if (!osm) return;
+           var tags = Object.assign({}, context.changeset.tags); // shallow copy
+           // assign tags for imagery used
+
+           var imageryUsed = context.cleanTagValue(context.history().imageryUsed().join(';'));
+           tags.imagery_used = imageryUsed || 'None'; // assign tags for closed issues and notes
+
+           var osmClosed = osm.getClosedIDs();
+           var itemType;
+
+           if (osmClosed.length) {
+             tags['closed:note'] = context.cleanTagValue(osmClosed.join(';'));
+           }
+
+           if (services.keepRight) {
+             var krClosed = services.keepRight.getClosedIDs();
+
+             if (krClosed.length) {
+               tags['closed:keepright'] = context.cleanTagValue(krClosed.join(';'));
              }
-             if (this$1._minDistance <= this$1._terminateDistance) { return null }
            }
-         }
-       };
-       DistanceOp.prototype.distance = function distance () {
-         if (this._geom[0] === null || this._geom[1] === null) { throw new IllegalArgumentException('null geometries are not supported') }
-         if (this._geom[0].isEmpty() || this._geom[1].isEmpty()) { return 0.0 }
-         this.computeMinDistance();
-         return this._minDistance
-       };
-       DistanceOp.prototype.computeMinDistanceLines = function computeMinDistanceLines (lines0, lines1, locGeom) {
-           var this$1 = this;
 
-         for (var i = 0; i < lines0.size(); i++) {
-           var line0 = lines0.get(i);
-           for (var j = 0; j < lines1.size(); j++) {
-             var line1 = lines1.get(j);
-             this$1.computeMinDistance(line0, line1, locGeom);
-             if (this$1._minDistance <= this$1._terminateDistance) { return null }
+           if (services.improveOSM) {
+             var iOsmClosed = services.improveOSM.getClosedCounts();
+
+             for (itemType in iOsmClosed) {
+               tags['closed:improveosm:' + itemType] = context.cleanTagValue(iOsmClosed[itemType].toString());
+             }
            }
-         }
-       };
-       DistanceOp.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       DistanceOp.prototype.getClass = function getClass () {
-         return DistanceOp
-       };
-       DistanceOp.distance = function distance (g0, g1) {
-         var distOp = new DistanceOp(g0, g1);
-         return distOp.distance()
-       };
-       DistanceOp.isWithinDistance = function isWithinDistance (g0, g1, distance) {
-         var distOp = new DistanceOp(g0, g1, distance);
-         return distOp.distance() <= distance
-       };
-       DistanceOp.nearestPoints = function nearestPoints (g0, g1) {
-         var distOp = new DistanceOp(g0, g1);
-         return distOp.nearestPoints()
-       };
 
-       var PointPairDistance$2 = function PointPairDistance () {
-         this._pt = [new Coordinate(), new Coordinate()];
-         this._distance = Double.NaN;
-         this._isNull = true;
-       };
-       PointPairDistance$2.prototype.getCoordinates = function getCoordinates () {
-         return this._pt
-       };
-       PointPairDistance$2.prototype.getCoordinate = function getCoordinate (i) {
-         return this._pt[i]
-       };
-       PointPairDistance$2.prototype.setMinimum = function setMinimum () {
-         if (arguments.length === 1) {
-           var ptDist = arguments[0];
-           this.setMinimum(ptDist._pt[0], ptDist._pt[1]);
-         } else if (arguments.length === 2) {
-           var p0 = arguments[0];
-           var p1 = arguments[1];
-           if (this._isNull) {
-             this.initialize(p0, p1);
-             return null
-           }
-           var dist = p0.distance(p1);
-           if (dist < this._distance) { this.initialize(p0, p1, dist); }
-         }
-       };
-       PointPairDistance$2.prototype.initialize = function initialize () {
-         if (arguments.length === 0) {
-           this._isNull = true;
-         } else if (arguments.length === 2) {
-           var p0 = arguments[0];
-           var p1 = arguments[1];
-           this._pt[0].setCoordinate(p0);
-           this._pt[1].setCoordinate(p1);
-           this._distance = p0.distance(p1);
-           this._isNull = false;
-         } else if (arguments.length === 3) {
-           var p0$1 = arguments[0];
-           var p1$1 = arguments[1];
-           var distance = arguments[2];
-           this._pt[0].setCoordinate(p0$1);
-           this._pt[1].setCoordinate(p1$1);
-           this._distance = distance;
-           this._isNull = false;
-         }
-       };
-       PointPairDistance$2.prototype.toString = function toString () {
-         return WKTWriter.toLineString(this._pt[0], this._pt[1])
-       };
-       PointPairDistance$2.prototype.getDistance = function getDistance () {
-         return this._distance
-       };
-       PointPairDistance$2.prototype.setMaximum = function setMaximum () {
-         if (arguments.length === 1) {
-           var ptDist = arguments[0];
-           this.setMaximum(ptDist._pt[0], ptDist._pt[1]);
-         } else if (arguments.length === 2) {
-           var p0 = arguments[0];
-           var p1 = arguments[1];
-           if (this._isNull) {
-             this.initialize(p0, p1);
-             return null
-           }
-           var dist = p0.distance(p1);
-           if (dist > this._distance) { this.initialize(p0, p1, dist); }
-         }
-       };
-       PointPairDistance$2.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       PointPairDistance$2.prototype.getClass = function getClass () {
-         return PointPairDistance$2
-       };
+           if (services.osmose) {
+             var osmoseClosed = services.osmose.getClosedCounts();
+
+             for (itemType in osmoseClosed) {
+               tags['closed:osmose:' + itemType] = context.cleanTagValue(osmoseClosed[itemType].toString());
+             }
+           } // remove existing issue counts
 
-       var DistanceToPoint = function DistanceToPoint () {};
 
-       DistanceToPoint.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       DistanceToPoint.prototype.getClass = function getClass () {
-         return DistanceToPoint
-       };
-       DistanceToPoint.computeDistance = function computeDistance () {
-         if (arguments[2] instanceof PointPairDistance$2 && (arguments[0] instanceof LineString && arguments[1] instanceof Coordinate)) {
-           var line = arguments[0];
-           var pt = arguments[1];
-           var ptDist = arguments[2];
-           var tempSegment = new LineSegment();
-           var coords = line.getCoordinates();
-           for (var i = 0; i < coords.length - 1; i++) {
-             tempSegment.setCoordinates(coords[i], coords[i + 1]);
-             var closestPt = tempSegment.closestPoint(pt);
-             ptDist.setMinimum(closestPt, pt);
-           }
-         } else if (arguments[2] instanceof PointPairDistance$2 && (arguments[0] instanceof Polygon && arguments[1] instanceof Coordinate)) {
-           var poly = arguments[0];
-           var pt$1 = arguments[1];
-           var ptDist$1 = arguments[2];
-           DistanceToPoint.computeDistance(poly.getExteriorRing(), pt$1, ptDist$1);
-           for (var i$1 = 0; i$1 < poly.getNumInteriorRing(); i$1++) {
-             DistanceToPoint.computeDistance(poly.getInteriorRingN(i$1), pt$1, ptDist$1);
-           }
-         } else if (arguments[2] instanceof PointPairDistance$2 && (arguments[0] instanceof Geometry && arguments[1] instanceof Coordinate)) {
-           var geom = arguments[0];
-           var pt$2 = arguments[1];
-           var ptDist$2 = arguments[2];
-           if (geom instanceof LineString) {
-             DistanceToPoint.computeDistance(geom, pt$2, ptDist$2);
-           } else if (geom instanceof Polygon) {
-             DistanceToPoint.computeDistance(geom, pt$2, ptDist$2);
-           } else if (geom instanceof GeometryCollection) {
-             var gc = geom;
-             for (var i$2 = 0; i$2 < gc.getNumGeometries(); i$2++) {
-               var g = gc.getGeometryN(i$2);
-               DistanceToPoint.computeDistance(g, pt$2, ptDist$2);
+           for (var key in tags) {
+             if (key.match(/(^warnings:)|(^resolved:)/)) {
+               delete tags[key];
              }
-           } else {
-             ptDist$2.setMinimum(geom.getCoordinate(), pt$2);
            }
-         } else if (arguments[2] instanceof PointPairDistance$2 && (arguments[0] instanceof LineSegment && arguments[1] instanceof Coordinate)) {
-           var segment = arguments[0];
-           var pt$3 = arguments[1];
-           var ptDist$3 = arguments[2];
-           var closestPt$1 = segment.closestPoint(pt$3);
-           ptDist$3.setMinimum(closestPt$1, pt$3);
-         }
-       };
 
-       var DiscreteHausdorffDistance = function DiscreteHausdorffDistance () {
-         this._g0 = null;
-         this._g1 = null;
-         this._ptDist = new PointPairDistance$2();
-         this._densifyFrac = 0.0;
-         var g0 = arguments[0];
-         var g1 = arguments[1];
-         this._g0 = g0;
-         this._g1 = g1;
-       };
+           function addIssueCounts(issues, prefix) {
+             var issuesByType = utilArrayGroupBy(issues, 'type');
 
-       var staticAccessors$39 = { MaxPointDistanceFilter: { configurable: true },MaxDensifiedByFractionDistanceFilter: { configurable: true } };
-       DiscreteHausdorffDistance.prototype.getCoordinates = function getCoordinates () {
-         return this._ptDist.getCoordinates()
-       };
-       DiscreteHausdorffDistance.prototype.setDensifyFraction = function setDensifyFraction (densifyFrac) {
-         if (densifyFrac > 1.0 || densifyFrac <= 0.0) { throw new IllegalArgumentException('Fraction is not in range (0.0 - 1.0]') }
-         this._densifyFrac = densifyFrac;
-       };
-       DiscreteHausdorffDistance.prototype.compute = function compute (g0, g1) {
-         this.computeOrientedDistance(g0, g1, this._ptDist);
-         this.computeOrientedDistance(g1, g0, this._ptDist);
-       };
-       DiscreteHausdorffDistance.prototype.distance = function distance () {
-         this.compute(this._g0, this._g1);
-         return this._ptDist.getDistance()
-       };
-       DiscreteHausdorffDistance.prototype.computeOrientedDistance = function computeOrientedDistance (discreteGeom, geom, ptDist) {
-         var distFilter = new MaxPointDistanceFilter$1(geom);
-         discreteGeom.apply(distFilter);
-         ptDist.setMaximum(distFilter.getMaxPointDistance());
-         if (this._densifyFrac > 0) {
-           var fracFilter = new MaxDensifiedByFractionDistanceFilter(geom, this._densifyFrac);
-           discreteGeom.apply(fracFilter);
-           ptDist.setMaximum(fracFilter.getMaxPointDistance());
-         }
-       };
-       DiscreteHausdorffDistance.prototype.orientedDistance = function orientedDistance () {
-         this.computeOrientedDistance(this._g0, this._g1, this._ptDist);
-         return this._ptDist.getDistance()
-       };
-       DiscreteHausdorffDistance.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       DiscreteHausdorffDistance.prototype.getClass = function getClass () {
-         return DiscreteHausdorffDistance
-       };
-       DiscreteHausdorffDistance.distance = function distance () {
-         if (arguments.length === 2) {
-           var g0 = arguments[0];
-           var g1 = arguments[1];
-           var dist = new DiscreteHausdorffDistance(g0, g1);
-           return dist.distance()
-         } else if (arguments.length === 3) {
-           var g0$1 = arguments[0];
-           var g1$1 = arguments[1];
-           var densifyFrac = arguments[2];
-           var dist$1 = new DiscreteHausdorffDistance(g0$1, g1$1);
-           dist$1.setDensifyFraction(densifyFrac);
-           return dist$1.distance()
-         }
-       };
-       staticAccessors$39.MaxPointDistanceFilter.get = function () { return MaxPointDistanceFilter$1 };
-       staticAccessors$39.MaxDensifiedByFractionDistanceFilter.get = function () { return MaxDensifiedByFractionDistanceFilter };
-
-       Object.defineProperties( DiscreteHausdorffDistance, staticAccessors$39 );
-
-       var MaxPointDistanceFilter$1 = function MaxPointDistanceFilter () {
-         this._maxPtDist = new PointPairDistance$2();
-         this._minPtDist = new PointPairDistance$2();
-         this._euclideanDist = new DistanceToPoint();
-         this._geom = null;
-         var geom = arguments[0];
-         this._geom = geom;
-       };
-       MaxPointDistanceFilter$1.prototype.filter = function filter (pt) {
-         this._minPtDist.initialize();
-         DistanceToPoint.computeDistance(this._geom, pt, this._minPtDist);
-         this._maxPtDist.setMaximum(this._minPtDist);
-       };
-       MaxPointDistanceFilter$1.prototype.getMaxPointDistance = function getMaxPointDistance () {
-         return this._maxPtDist
-       };
-       MaxPointDistanceFilter$1.prototype.interfaces_ = function interfaces_ () {
-         return [CoordinateFilter]
-       };
-       MaxPointDistanceFilter$1.prototype.getClass = function getClass () {
-         return MaxPointDistanceFilter$1
-       };
+             for (var issueType in issuesByType) {
+               var issuesOfType = issuesByType[issueType];
 
-       var MaxDensifiedByFractionDistanceFilter = function MaxDensifiedByFractionDistanceFilter () {
-         this._maxPtDist = new PointPairDistance$2();
-         this._minPtDist = new PointPairDistance$2();
-         this._geom = null;
-         this._numSubSegs = 0;
-         var geom = arguments[0];
-         var fraction = arguments[1];
-         this._geom = geom;
-         this._numSubSegs = Math.trunc(Math.round(1.0 / fraction));
-       };
-       MaxDensifiedByFractionDistanceFilter.prototype.filter = function filter (seq, index) {
-           var this$1 = this;
-
-         if (index === 0) { return null }
-         var p0 = seq.getCoordinate(index - 1);
-         var p1 = seq.getCoordinate(index);
-         var delx = (p1.x - p0.x) / this._numSubSegs;
-         var dely = (p1.y - p0.y) / this._numSubSegs;
-         for (var i = 0; i < this._numSubSegs; i++) {
-           var x = p0.x + i * delx;
-           var y = p0.y + i * dely;
-           var pt = new Coordinate(x, y);
-           this$1._minPtDist.initialize();
-           DistanceToPoint.computeDistance(this$1._geom, pt, this$1._minPtDist);
-           this$1._maxPtDist.setMaximum(this$1._minPtDist);
-         }
-       };
-       MaxDensifiedByFractionDistanceFilter.prototype.isDone = function isDone () {
-         return false
-       };
-       MaxDensifiedByFractionDistanceFilter.prototype.isGeometryChanged = function isGeometryChanged () {
-         return false
-       };
-       MaxDensifiedByFractionDistanceFilter.prototype.getMaxPointDistance = function getMaxPointDistance () {
-         return this._maxPtDist
-       };
-       MaxDensifiedByFractionDistanceFilter.prototype.interfaces_ = function interfaces_ () {
-         return [CoordinateSequenceFilter]
-       };
-       MaxDensifiedByFractionDistanceFilter.prototype.getClass = function getClass () {
-         return MaxDensifiedByFractionDistanceFilter
-       };
+               if (issuesOfType[0].subtype) {
+                 var issuesBySubtype = utilArrayGroupBy(issuesOfType, 'subtype');
 
-       var BufferDistanceValidator = function BufferDistanceValidator (input, bufDistance, result) {
-         this._minValidDistance = null;
-         this._maxValidDistance = null;
-         this._minDistanceFound = null;
-         this._maxDistanceFound = null;
-         this._isValid = true;
-         this._errMsg = null;
-         this._errorLocation = null;
-         this._errorIndicator = null;
-         this._input = input || null;
-         this._bufDistance = bufDistance || null;
-         this._result = result || null;
-       };
+                 for (var issueSubtype in issuesBySubtype) {
+                   var issuesOfSubtype = issuesBySubtype[issueSubtype];
+                   tags[prefix + ':' + issueType + ':' + issueSubtype] = context.cleanTagValue(issuesOfSubtype.length.toString());
+                 }
+               } else {
+                 tags[prefix + ':' + issueType] = context.cleanTagValue(issuesOfType.length.toString());
+               }
+             }
+           } // add counts of warnings generated by the user's edits
 
-       var staticAccessors$37 = { VERBOSE: { configurable: true },MAX_DISTANCE_DIFF_FRAC: { configurable: true } };
-       BufferDistanceValidator.prototype.checkMaximumDistance = function checkMaximumDistance (input, bufCurve, maxDist) {
-         var haus = new DiscreteHausdorffDistance(bufCurve, input);
-         haus.setDensifyFraction(0.25);
-         this._maxDistanceFound = haus.orientedDistance();
-         if (this._maxDistanceFound > maxDist) {
-           this._isValid = false;
-           var pts = haus.getCoordinates();
-           this._errorLocation = pts[1];
-           this._errorIndicator = input.getFactory().createLineString(pts);
-           this._errMsg = 'Distance between buffer curve and input is too large (' + this._maxDistanceFound + ' at ' + WKTWriter.toLineString(pts[0], pts[1]) + ')';
-         }
-       };
-       BufferDistanceValidator.prototype.isValid = function isValid () {
-         var posDistance = Math.abs(this._bufDistance);
-         var distDelta = BufferDistanceValidator.MAX_DISTANCE_DIFF_FRAC * posDistance;
-         this._minValidDistance = posDistance - distDelta;
-         this._maxValidDistance = posDistance + distDelta;
-         if (this._input.isEmpty() || this._result.isEmpty()) { return true }
-         if (this._bufDistance > 0.0) {
-           this.checkPositiveValid();
-         } else {
-           this.checkNegativeValid();
-         }
-         if (BufferDistanceValidator.VERBOSE) {
-           System.out.println('Min Dist= ' + this._minDistanceFound + '  err= ' + (1.0 - this._minDistanceFound / this._bufDistance) + '  Max Dist= ' + this._maxDistanceFound + '  err= ' + (this._maxDistanceFound / this._bufDistance - 1.0));
-         }
-         return this._isValid
-       };
-       BufferDistanceValidator.prototype.checkNegativeValid = function checkNegativeValid () {
-         if (!(this._input instanceof Polygon || this._input instanceof MultiPolygon || this._input instanceof GeometryCollection)) {
-           return null
-         }
-         var inputCurve = this.getPolygonLines(this._input);
-         this.checkMinimumDistance(inputCurve, this._result, this._minValidDistance);
-         if (!this._isValid) { return null }
-         this.checkMaximumDistance(inputCurve, this._result, this._maxValidDistance);
-       };
-       BufferDistanceValidator.prototype.getErrorIndicator = function getErrorIndicator () {
-         return this._errorIndicator
-       };
-       BufferDistanceValidator.prototype.checkMinimumDistance = function checkMinimumDistance (g1, g2, minDist) {
-         var distOp = new DistanceOp(g1, g2, minDist);
-         this._minDistanceFound = distOp.distance();
-         if (this._minDistanceFound < minDist) {
-           this._isValid = false;
-           var pts = distOp.nearestPoints();
-           this._errorLocation = distOp.nearestPoints()[1];
-           this._errorIndicator = g1.getFactory().createLineString(pts);
-           this._errMsg = 'Distance between buffer curve and input is too small (' + this._minDistanceFound + ' at ' + WKTWriter.toLineString(pts[0], pts[1]) + ' )';
+
+           var warnings = context.validator().getIssuesBySeverity({
+             what: 'edited',
+             where: 'all',
+             includeIgnored: true,
+             includeDisabledRules: true
+           }).warning;
+           addIssueCounts(warnings, 'warnings'); // add counts of issues resolved by the user's edits
+
+           var resolvedIssues = context.validator().getResolvedIssues();
+           addIssueCounts(resolvedIssues, 'resolved');
+           context.changeset = context.changeset.update({
+             tags: tags
+           });
          }
-       };
-       BufferDistanceValidator.prototype.checkPositiveValid = function checkPositiveValid () {
-         var bufCurve = this._result.getBoundary();
-         this.checkMinimumDistance(this._input, bufCurve, this._minValidDistance);
-         if (!this._isValid) { return null }
-         this.checkMaximumDistance(this._input, bufCurve, this._maxValidDistance);
-       };
-       BufferDistanceValidator.prototype.getErrorLocation = function getErrorLocation () {
-         return this._errorLocation
-       };
-       BufferDistanceValidator.prototype.getPolygonLines = function getPolygonLines (g) {
-         var lines = new ArrayList();
-         var lineExtracter = new LinearComponentExtracter(lines);
-         var polys = PolygonExtracter.getPolygons(g);
-         for (var i = polys.iterator(); i.hasNext();) {
-           var poly = i.next();
-           poly.apply(lineExtracter);
-         }
-         return g.getFactory().buildGeometry(lines)
-       };
-       BufferDistanceValidator.prototype.getErrorMessage = function getErrorMessage () {
-         return this._errMsg
-       };
-       BufferDistanceValidator.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       BufferDistanceValidator.prototype.getClass = function getClass () {
-         return BufferDistanceValidator
-       };
-       staticAccessors$37.VERBOSE.get = function () { return false };
-       staticAccessors$37.MAX_DISTANCE_DIFF_FRAC.get = function () { return 0.012 };
-
-       Object.defineProperties( BufferDistanceValidator, staticAccessors$37 );
-
-       var BufferResultValidator = function BufferResultValidator (input, distance, result) {
-         this._isValid = true;
-         this._errorMsg = null;
-         this._errorLocation = null;
-         this._errorIndicator = null;
-         this._input = input || null;
-         this._distance = distance || null;
-         this._result = result || null;
-       };
 
-       var staticAccessors$40 = { VERBOSE: { configurable: true },MAX_ENV_DIFF_FRAC: { configurable: true } };
-       BufferResultValidator.prototype.isValid = function isValid () {
-         this.checkPolygonal();
-         if (!this._isValid) { return this._isValid }
-         this.checkExpectedEmpty();
-         if (!this._isValid) { return this._isValid }
-         this.checkEnvelope();
-         if (!this._isValid) { return this._isValid }
-         this.checkArea();
-         if (!this._isValid) { return this._isValid }
-         this.checkDistance();
-         return this._isValid
-       };
-       BufferResultValidator.prototype.checkEnvelope = function checkEnvelope () {
-         if (this._distance < 0.0) { return null }
-         var padding = this._distance * BufferResultValidator.MAX_ENV_DIFF_FRAC;
-         if (padding === 0.0) { padding = 0.001; }
-         var expectedEnv = new Envelope(this._input.getEnvelopeInternal());
-         expectedEnv.expandBy(this._distance);
-         var bufEnv = new Envelope(this._result.getEnvelopeInternal());
-         bufEnv.expandBy(padding);
-         if (!bufEnv.contains(expectedEnv)) {
-           this._isValid = false;
-           this._errorMsg = 'Buffer envelope is incorrect';
-           this._errorIndicator = this._input.getFactory().toGeometry(bufEnv);
-         }
-         this.report('Envelope');
-       };
-       BufferResultValidator.prototype.checkDistance = function checkDistance () {
-         var distValid = new BufferDistanceValidator(this._input, this._distance, this._result);
-         if (!distValid.isValid()) {
-           this._isValid = false;
-           this._errorMsg = distValid.getErrorMessage();
-           this._errorLocation = distValid.getErrorLocation();
-           this._errorIndicator = distValid.getErrorIndicator();
-         }
-         this.report('Distance');
-       };
-       BufferResultValidator.prototype.checkArea = function checkArea () {
-         var inputArea = this._input.getArea();
-         var resultArea = this._result.getArea();
-         if (this._distance > 0.0 && inputArea > resultArea) {
-           this._isValid = false;
-           this._errorMsg = 'Area of positive buffer is smaller than input';
-           this._errorIndicator = this._result;
-         }
-         if (this._distance < 0.0 && inputArea < resultArea) {
-           this._isValid = false;
-           this._errorMsg = 'Area of negative buffer is larger than input';
-           this._errorIndicator = this._result;
-         }
-         this.report('Area');
-       };
-       BufferResultValidator.prototype.checkPolygonal = function checkPolygonal () {
-         if (!(this._result instanceof Polygon || this._result instanceof MultiPolygon)) { this._isValid = false; }
-         this._errorMsg = 'Result is not polygonal';
-         this._errorIndicator = this._result;
-         this.report('Polygonal');
-       };
-       BufferResultValidator.prototype.getErrorIndicator = function getErrorIndicator () {
-         return this._errorIndicator
-       };
-       BufferResultValidator.prototype.getErrorLocation = function getErrorLocation () {
-         return this._errorLocation
-       };
-       BufferResultValidator.prototype.checkExpectedEmpty = function checkExpectedEmpty () {
-         if (this._input.getDimension() >= 2) { return null }
-         if (this._distance > 0.0) { return null }
-         if (!this._result.isEmpty()) {
-           this._isValid = false;
-           this._errorMsg = 'Result is non-empty';
-           this._errorIndicator = this._result;
-         }
-         this.report('ExpectedEmpty');
-       };
-       BufferResultValidator.prototype.report = function report (checkName) {
-         if (!BufferResultValidator.VERBOSE) { return null }
-         System.out.println('Check ' + checkName + ': ' + (this._isValid ? 'passed' : 'FAILED'));
-       };
-       BufferResultValidator.prototype.getErrorMessage = function getErrorMessage () {
-         return this._errorMsg
-       };
-       BufferResultValidator.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       BufferResultValidator.prototype.getClass = function getClass () {
-         return BufferResultValidator
-       };
-       BufferResultValidator.isValidMsg = function isValidMsg (g, distance, result) {
-         var validator = new BufferResultValidator(g, distance, result);
-         if (!validator.isValid()) { return validator.getErrorMessage() }
-         return null
-       };
-       BufferResultValidator.isValid = function isValid (g, distance, result) {
-         var validator = new BufferResultValidator(g, distance, result);
-         if (validator.isValid()) { return true }
-         return false
-       };
-       staticAccessors$40.VERBOSE.get = function () { return false };
-       staticAccessors$40.MAX_ENV_DIFF_FRAC.get = function () { return 0.012 };
+         function render(selection) {
+           var osm = context.connection();
+           if (!osm) return;
+           var header = selection.selectAll('.header').data([0]);
+           var headerTitle = header.enter().append('div').attr('class', 'header fillL');
+           headerTitle.append('div').append('h3').html(_t.html('commit.title'));
+           headerTitle.append('button').attr('class', 'close').on('click', function () {
+             dispatch$1.call('cancel', this);
+           }).call(svgIcon('#iD-icon-close'));
+           var body = selection.selectAll('.body').data([0]);
+           body = body.enter().append('div').attr('class', 'body').merge(body); // Changeset Section
 
-       Object.defineProperties( BufferResultValidator, staticAccessors$40 );
+           var changesetSection = body.selectAll('.changeset-editor').data([0]);
+           changesetSection = changesetSection.enter().append('div').attr('class', 'modal-section changeset-editor').merge(changesetSection);
+           changesetSection.call(changesetEditor.changesetID(context.changeset.id).tags(context.changeset.tags)); // Warnings
 
-       // operation.buffer
+           body.call(commitWarnings); // Upload Explanation
 
-       var BasicSegmentString = function BasicSegmentString () {
-         this._pts = null;
-         this._data = null;
-         var pts = arguments[0];
-         var data = arguments[1];
-         this._pts = pts;
-         this._data = data;
-       };
-       BasicSegmentString.prototype.getCoordinates = function getCoordinates () {
-         return this._pts
-       };
-       BasicSegmentString.prototype.size = function size () {
-         return this._pts.length
-       };
-       BasicSegmentString.prototype.getCoordinate = function getCoordinate (i) {
-         return this._pts[i]
-       };
-       BasicSegmentString.prototype.isClosed = function isClosed () {
-         return this._pts[0].equals(this._pts[this._pts.length - 1])
-       };
-       BasicSegmentString.prototype.getSegmentOctant = function getSegmentOctant (index) {
-         if (index === this._pts.length - 1) { return -1 }
-         return Octant.octant(this.getCoordinate(index), this.getCoordinate(index + 1))
-       };
-       BasicSegmentString.prototype.setData = function setData (data) {
-         this._data = data;
-       };
-       BasicSegmentString.prototype.getData = function getData () {
-         return this._data
-       };
-       BasicSegmentString.prototype.toString = function toString () {
-         return WKTWriter.toLineString(new CoordinateArraySequence(this._pts))
-       };
-       BasicSegmentString.prototype.interfaces_ = function interfaces_ () {
-         return [SegmentString]
-       };
-       BasicSegmentString.prototype.getClass = function getClass () {
-         return BasicSegmentString
-       };
+           var saveSection = body.selectAll('.save-section').data([0]);
+           saveSection = saveSection.enter().append('div').attr('class', 'modal-section save-section fillL').merge(saveSection);
+           var prose = saveSection.selectAll('.commit-info').data([0]);
 
-       var InteriorIntersectionFinder = function InteriorIntersectionFinder () {
-         this._findAllIntersections = false;
-         this._isCheckEndSegmentsOnly = false;
-         this._li = null;
-         this._interiorIntersection = null;
-         this._intSegments = null;
-         this._intersections = new ArrayList();
-         this._intersectionCount = 0;
-         this._keepIntersections = true;
-         var li = arguments[0];
-         this._li = li;
-         this._interiorIntersection = null;
-       };
-       InteriorIntersectionFinder.prototype.getInteriorIntersection = function getInteriorIntersection () {
-         return this._interiorIntersection
-       };
-       InteriorIntersectionFinder.prototype.setCheckEndSegmentsOnly = function setCheckEndSegmentsOnly (isCheckEndSegmentsOnly) {
-         this._isCheckEndSegmentsOnly = isCheckEndSegmentsOnly;
-       };
-       InteriorIntersectionFinder.prototype.getIntersectionSegments = function getIntersectionSegments () {
-         return this._intSegments
-       };
-       InteriorIntersectionFinder.prototype.count = function count () {
-         return this._intersectionCount
-       };
-       InteriorIntersectionFinder.prototype.getIntersections = function getIntersections () {
-         return this._intersections
-       };
-       InteriorIntersectionFinder.prototype.setFindAllIntersections = function setFindAllIntersections (findAllIntersections) {
-         this._findAllIntersections = findAllIntersections;
-       };
-       InteriorIntersectionFinder.prototype.setKeepIntersections = function setKeepIntersections (keepIntersections) {
-         this._keepIntersections = keepIntersections;
-       };
-       InteriorIntersectionFinder.prototype.processIntersections = function processIntersections (e0, segIndex0, e1, segIndex1) {
-         if (!this._findAllIntersections && this.hasIntersection()) { return null }
-         if (e0 === e1 && segIndex0 === segIndex1) { return null }
-         if (this._isCheckEndSegmentsOnly) {
-           var isEndSegPresent = this.isEndSegment(e0, segIndex0) || this.isEndSegment(e1, segIndex1);
-           if (!isEndSegPresent) { return null }
-         }
-         var p00 = e0.getCoordinates()[segIndex0];
-         var p01 = e0.getCoordinates()[segIndex0 + 1];
-         var p10 = e1.getCoordinates()[segIndex1];
-         var p11 = e1.getCoordinates()[segIndex1 + 1];
-         this._li.computeIntersection(p00, p01, p10, p11);
-         if (this._li.hasIntersection()) {
-           if (this._li.isInteriorIntersection()) {
-             this._intSegments = new Array(4).fill(null);
-             this._intSegments[0] = p00;
-             this._intSegments[1] = p01;
-             this._intSegments[2] = p10;
-             this._intSegments[3] = p11;
-             this._interiorIntersection = this._li.getIntersection(0);
-             if (this._keepIntersections) { this._intersections.add(this._interiorIntersection); }
-             this._intersectionCount++;
+           if (prose.enter().size()) {
+             // first time, make sure to update user details in prose
+             _userDetails = null;
            }
-         }
-       };
-       InteriorIntersectionFinder.prototype.isEndSegment = function isEndSegment (segStr, index) {
-         if (index === 0) { return true }
-         if (index >= segStr.size() - 2) { return true }
-         return false
-       };
-       InteriorIntersectionFinder.prototype.hasIntersection = function hasIntersection () {
-         return this._interiorIntersection !== null
-       };
-       InteriorIntersectionFinder.prototype.isDone = function isDone () {
-         if (this._findAllIntersections) { return false }
-         return this._interiorIntersection !== null
-       };
-       InteriorIntersectionFinder.prototype.interfaces_ = function interfaces_ () {
-         return [SegmentIntersector]
-       };
-       InteriorIntersectionFinder.prototype.getClass = function getClass () {
-         return InteriorIntersectionFinder
-       };
-       InteriorIntersectionFinder.createAllIntersectionsFinder = function createAllIntersectionsFinder (li) {
-         var finder = new InteriorIntersectionFinder(li);
-         finder.setFindAllIntersections(true);
-         return finder
-       };
-       InteriorIntersectionFinder.createAnyIntersectionFinder = function createAnyIntersectionFinder (li) {
-         return new InteriorIntersectionFinder(li)
-       };
-       InteriorIntersectionFinder.createIntersectionCounter = function createIntersectionCounter (li) {
-         var finder = new InteriorIntersectionFinder(li);
-         finder.setFindAllIntersections(true);
-         finder.setKeepIntersections(false);
-         return finder
-       };
 
-       var FastNodingValidator = function FastNodingValidator () {
-         this._li = new RobustLineIntersector();
-         this._segStrings = null;
-         this._findAllIntersections = false;
-         this._segInt = null;
-         this._isValid = true;
-         var segStrings = arguments[0];
-         this._segStrings = segStrings;
-       };
-       FastNodingValidator.prototype.execute = function execute () {
-         if (this._segInt !== null) { return null }
-         this.checkInteriorIntersections();
-       };
-       FastNodingValidator.prototype.getIntersections = function getIntersections () {
-         return this._segInt.getIntersections()
-       };
-       FastNodingValidator.prototype.isValid = function isValid () {
-         this.execute();
-         return this._isValid
-       };
-       FastNodingValidator.prototype.setFindAllIntersections = function setFindAllIntersections (findAllIntersections) {
-         this._findAllIntersections = findAllIntersections;
-       };
-       FastNodingValidator.prototype.checkInteriorIntersections = function checkInteriorIntersections () {
-         this._isValid = true;
-         this._segInt = new InteriorIntersectionFinder(this._li);
-         this._segInt.setFindAllIntersections(this._findAllIntersections);
-         var noder = new MCIndexNoder();
-         noder.setSegmentIntersector(this._segInt);
-         noder.computeNodes(this._segStrings);
-         if (this._segInt.hasIntersection()) {
-           this._isValid = false;
-           return null
-         }
-       };
-       FastNodingValidator.prototype.checkValid = function checkValid () {
-         this.execute();
-         if (!this._isValid) { throw new TopologyException(this.getErrorMessage(), this._segInt.getInteriorIntersection()) }
-       };
-       FastNodingValidator.prototype.getErrorMessage = function getErrorMessage () {
-         if (this._isValid) { return 'no intersections found' }
-         var intSegs = this._segInt.getIntersectionSegments();
-         return 'found non-noded intersection between ' + WKTWriter.toLineString(intSegs[0], intSegs[1]) + ' and ' + WKTWriter.toLineString(intSegs[2], intSegs[3])
-       };
-       FastNodingValidator.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       FastNodingValidator.prototype.getClass = function getClass () {
-         return FastNodingValidator
-       };
-       FastNodingValidator.computeIntersections = function computeIntersections (segStrings) {
-         var nv = new FastNodingValidator(segStrings);
-         nv.setFindAllIntersections(true);
-         nv.isValid();
-         return nv.getIntersections()
-       };
+           prose = prose.enter().append('p').attr('class', 'commit-info').html(_t.html('commit.upload_explanation')).merge(prose); // always check if this has changed, but only update prose.html()
+           // if needed, because it can trigger a style recalculation
 
-       var EdgeNodingValidator = function EdgeNodingValidator () {
-         this._nv = null;
-         var edges = arguments[0];
-         this._nv = new FastNodingValidator(EdgeNodingValidator.toSegmentStrings(edges));
-       };
-       EdgeNodingValidator.prototype.checkValid = function checkValid () {
-         this._nv.checkValid();
-       };
-       EdgeNodingValidator.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       EdgeNodingValidator.prototype.getClass = function getClass () {
-         return EdgeNodingValidator
-       };
-       EdgeNodingValidator.toSegmentStrings = function toSegmentStrings (edges) {
-         var segStrings = new ArrayList();
-         for (var i = edges.iterator(); i.hasNext();) {
-           var e = i.next();
-           segStrings.add(new BasicSegmentString(e.getCoordinates(), e));
-         }
-         return segStrings
-       };
-       EdgeNodingValidator.checkValid = function checkValid (edges) {
-         var validator = new EdgeNodingValidator(edges);
-         validator.checkValid();
-       };
+           osm.userDetails(function (err, user) {
+             if (err) return;
+             if (_userDetails === user) return; // no change
 
-       var GeometryCollectionMapper = function GeometryCollectionMapper (mapOp) {
-         this._mapOp = mapOp;
-       };
-       GeometryCollectionMapper.prototype.map = function map (gc) {
-           var this$1 = this;
+             _userDetails = user;
+             var userLink = select(document.createElement('div'));
 
-         var mapped = new ArrayList();
-         for (var i = 0; i < gc.getNumGeometries(); i++) {
-           var g = this$1._mapOp.map(gc.getGeometryN(i));
-           if (!g.isEmpty()) { mapped.add(g); }
-         }
-         return gc.getFactory().createGeometryCollection(GeometryFactory.toGeometryArray(mapped))
-       };
-       GeometryCollectionMapper.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       GeometryCollectionMapper.prototype.getClass = function getClass () {
-         return GeometryCollectionMapper
-       };
-       GeometryCollectionMapper.map = function map (gc, op) {
-         var mapper = new GeometryCollectionMapper(op);
-         return mapper.map(gc)
-       };
+             if (user.image_url) {
+               userLink.append('img').attr('src', user.image_url).attr('class', 'icon pre-text user-icon');
+             }
 
-       var LineBuilder = function LineBuilder () {
-         this._op = null;
-         this._geometryFactory = null;
-         this._ptLocator = null;
-         this._lineEdgesList = new ArrayList();
-         this._resultLineList = new ArrayList();
-         var op = arguments[0];
-         var geometryFactory = arguments[1];
-         var ptLocator = arguments[2];
-         this._op = op;
-         this._geometryFactory = geometryFactory;
-         this._ptLocator = ptLocator;
-       };
-       LineBuilder.prototype.collectLines = function collectLines (opCode) {
-           var this$1 = this;
+             userLink.append('a').attr('class', 'user-info').html(user.display_name).attr('href', osm.userURL(user.display_name)).attr('target', '_blank');
+             prose.html(_t.html('commit.upload_explanation_with_user', {
+               user: userLink.html()
+             }));
+           }); // Request Review
 
-         for (var it = this._op.getGraph().getEdgeEnds().iterator(); it.hasNext();) {
-           var de = it.next();
-           this$1.collectLineEdge(de, opCode, this$1._lineEdgesList);
-           this$1.collectBoundaryTouchEdge(de, opCode, this$1._lineEdgesList);
-         }
-       };
-       LineBuilder.prototype.labelIsolatedLine = function labelIsolatedLine (e, targetIndex) {
-         var loc = this._ptLocator.locate(e.getCoordinate(), this._op.getArgGeometry(targetIndex));
-         e.getLabel().setLocation(targetIndex, loc);
-       };
-       LineBuilder.prototype.build = function build (opCode) {
-         this.findCoveredLineEdges();
-         this.collectLines(opCode);
-         this.buildLines(opCode);
-         return this._resultLineList
-       };
-       LineBuilder.prototype.collectLineEdge = function collectLineEdge (de, opCode, edges) {
-         var label = de.getLabel();
-         var e = de.getEdge();
-         if (de.isLineEdge()) {
-           if (!de.isVisited() && OverlayOp.isResultOfOp(label, opCode) && !e.isCovered()) {
-             edges.add(e);
-             de.setVisitedEdge(true);
-           }
-         }
-       };
-       LineBuilder.prototype.findCoveredLineEdges = function findCoveredLineEdges () {
-           var this$1 = this;
+           var requestReview = saveSection.selectAll('.request-review').data([0]); // Enter
 
-         for (var nodeit = this._op.getGraph().getNodes().iterator(); nodeit.hasNext();) {
-           var node = nodeit.next();
-           node.getEdges().findCoveredLineEdges();
-         }
-         for (var it = this._op.getGraph().getEdgeEnds().iterator(); it.hasNext();) {
-           var de = it.next();
-           var e = de.getEdge();
-           if (de.isLineEdge() && !e.isCoveredSet()) {
-             var isCovered = this$1._op.isCoveredByA(de.getCoordinate());
-             e.setCovered(isCovered);
-           }
-         }
-       };
-       LineBuilder.prototype.labelIsolatedLines = function labelIsolatedLines (edgesList) {
-           var this$1 = this;
+           var requestReviewEnter = requestReview.enter().append('div').attr('class', 'request-review');
+           var requestReviewDomId = utilUniqueDomId('commit-input-request-review');
+           var labelEnter = requestReviewEnter.append('label').attr('for', requestReviewDomId);
+           labelEnter.append('input').attr('type', 'checkbox').attr('id', requestReviewDomId);
+           labelEnter.append('span').html(_t.html('commit.request_review')); // Update
 
-         for (var it = edgesList.iterator(); it.hasNext();) {
-           var e = it.next();
-           var label = e.getLabel();
-           if (e.isIsolated()) {
-             if (label.isNull(0)) { this$1.labelIsolatedLine(e, 0); } else { this$1.labelIsolatedLine(e, 1); }
-           }
-         }
-       };
-       LineBuilder.prototype.buildLines = function buildLines (opCode) {
-           var this$1 = this;
+           requestReview = requestReview.merge(requestReviewEnter);
+           var requestReviewInput = requestReview.selectAll('input').property('checked', isReviewRequested(context.changeset.tags)).on('change', toggleRequestReview); // Buttons
 
-         for (var it = this._lineEdgesList.iterator(); it.hasNext();) {
-           var e = it.next();
-           // const label = e.getLabel()
-           var line = this$1._geometryFactory.createLineString(e.getCoordinates());
-           this$1._resultLineList.add(line);
-           e.setInResult(true);
-         }
-       };
-       LineBuilder.prototype.collectBoundaryTouchEdge = function collectBoundaryTouchEdge (de, opCode, edges) {
-         var label = de.getLabel();
-         if (de.isLineEdge()) { return null }
-         if (de.isVisited()) { return null }
-         if (de.isInteriorAreaEdge()) { return null }
-         if (de.getEdge().isInResult()) { return null }
-         Assert.isTrue(!(de.isInResult() || de.getSym().isInResult()) || !de.getEdge().isInResult());
-         if (OverlayOp.isResultOfOp(label, opCode) && opCode === OverlayOp.INTERSECTION) {
-           edges.add(de.getEdge());
-           de.setVisitedEdge(true);
-         }
-       };
-       LineBuilder.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       LineBuilder.prototype.getClass = function getClass () {
-         return LineBuilder
-       };
+           var buttonSection = saveSection.selectAll('.buttons').data([0]); // enter
 
-       var PointBuilder = function PointBuilder () {
-         this._op = null;
-         this._geometryFactory = null;
-         this._resultPointList = new ArrayList();
-         var op = arguments[0];
-         var geometryFactory = arguments[1];
-         // const ptLocator = arguments[2]
-         this._op = op;
-         this._geometryFactory = geometryFactory;
-       };
-       PointBuilder.prototype.filterCoveredNodeToPoint = function filterCoveredNodeToPoint (n) {
-         var coord = n.getCoordinate();
-         if (!this._op.isCoveredByLA(coord)) {
-           var pt = this._geometryFactory.createPoint(coord);
-           this._resultPointList.add(pt);
-         }
-       };
-       PointBuilder.prototype.extractNonCoveredResultNodes = function extractNonCoveredResultNodes (opCode) {
-           var this$1 = this;
+           var buttonEnter = buttonSection.enter().append('div').attr('class', 'buttons fillL');
+           buttonEnter.append('button').attr('class', 'secondary-action button cancel-button').append('span').attr('class', 'label').html(_t.html('commit.cancel'));
+           var uploadButton = buttonEnter.append('button').attr('class', 'action button save-button');
+           uploadButton.append('span').attr('class', 'label').html(_t.html('commit.save'));
+           var uploadBlockerTooltipText = getUploadBlockerMessage(); // update
 
-         for (var nodeit = this._op.getGraph().getNodes().iterator(); nodeit.hasNext();) {
-           var n = nodeit.next();
-           if (n.isInResult()) { continue }
-           if (n.isIncidentEdgeInResult()) { continue }
-           if (n.getEdges().getDegree() === 0 || opCode === OverlayOp.INTERSECTION) {
-             var label = n.getLabel();
-             if (OverlayOp.isResultOfOp(label, opCode)) {
-               this$1.filterCoveredNodeToPoint(n);
+           buttonSection = buttonSection.merge(buttonEnter);
+           buttonSection.selectAll('.cancel-button').on('click.cancel', function () {
+             dispatch$1.call('cancel', this);
+           });
+           buttonSection.selectAll('.save-button').classed('disabled', uploadBlockerTooltipText !== null).on('click.save', function () {
+             if (!select(this).classed('disabled')) {
+               this.blur(); // avoid keeping focus on the button - #4641
+
+               for (var key in context.changeset.tags) {
+                 // remove any empty keys before upload
+                 if (!key) delete context.changeset.tags[key];
+               }
+
+               context.uploader().save(context.changeset);
              }
+           }); // remove any existing tooltip
+
+           uiTooltip().destroyAny(buttonSection.selectAll('.save-button'));
+
+           if (uploadBlockerTooltipText) {
+             buttonSection.selectAll('.save-button').call(uiTooltip().title(uploadBlockerTooltipText).placement('top'));
+           } // Raw Tag Editor
+
+
+           var tagSection = body.selectAll('.tag-section.raw-tag-editor').data([0]);
+           tagSection = tagSection.enter().append('div').attr('class', 'modal-section tag-section raw-tag-editor').merge(tagSection);
+           tagSection.call(rawTagEditor.tags(Object.assign({}, context.changeset.tags)) // shallow copy
+           .render);
+           var changesSection = body.selectAll('.commit-changes-section').data([0]);
+           changesSection = changesSection.enter().append('div').attr('class', 'modal-section commit-changes-section').merge(changesSection); // Change summary
+
+           changesSection.call(commitChanges.render);
+
+           function toggleRequestReview() {
+             var rr = requestReviewInput.property('checked');
+             updateChangeset({
+               review_requested: rr ? 'yes' : undefined
+             });
+             tagSection.call(rawTagEditor.tags(Object.assign({}, context.changeset.tags)) // shallow copy
+             .render);
            }
          }
-       };
-       PointBuilder.prototype.build = function build (opCode) {
-         this.extractNonCoveredResultNodes(opCode);
-         return this._resultPointList
-       };
-       PointBuilder.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       PointBuilder.prototype.getClass = function getClass () {
-         return PointBuilder
-       };
 
-       var GeometryTransformer = function GeometryTransformer () {
-         this._inputGeom = null;
-         this._factory = null;
-         this._pruneEmptyGeometry = true;
-         this._preserveGeometryCollectionType = true;
-         this._preserveCollections = false;
-         this._preserveType = false;
-       };
-       GeometryTransformer.prototype.transformPoint = function transformPoint (geom, parent) {
-         return this._factory.createPoint(this.transformCoordinates(geom.getCoordinateSequence(), geom))
-       };
-       GeometryTransformer.prototype.transformPolygon = function transformPolygon (geom, parent) {
-           var this$1 = this;
-
-         var isAllValidLinearRings = true;
-         var shell = this.transformLinearRing(geom.getExteriorRing(), geom);
-         if (shell === null || !(shell instanceof LinearRing) || shell.isEmpty()) { isAllValidLinearRings = false; }
-         var holes = new ArrayList();
-         for (var i = 0; i < geom.getNumInteriorRing(); i++) {
-           var hole = this$1.transformLinearRing(geom.getInteriorRingN(i), geom);
-           if (hole === null || hole.isEmpty()) {
-             continue
-           }
-           if (!(hole instanceof LinearRing)) { isAllValidLinearRings = false; }
-           holes.add(hole);
-         }
-         if (isAllValidLinearRings) { return this._factory.createPolygon(shell, holes.toArray([])); } else {
-           var components = new ArrayList();
-           if (shell !== null) { components.add(shell); }
-           components.addAll(holes);
-           return this._factory.buildGeometry(components)
-         }
-       };
-       GeometryTransformer.prototype.createCoordinateSequence = function createCoordinateSequence (coords) {
-         return this._factory.getCoordinateSequenceFactory().create(coords)
-       };
-       GeometryTransformer.prototype.getInputGeometry = function getInputGeometry () {
-         return this._inputGeom
-       };
-       GeometryTransformer.prototype.transformMultiLineString = function transformMultiLineString (geom, parent) {
-           var this$1 = this;
+         function getUploadBlockerMessage() {
+           var errors = context.validator().getIssuesBySeverity({
+             what: 'edited',
+             where: 'all'
+           }).error;
 
-         var transGeomList = new ArrayList();
-         for (var i = 0; i < geom.getNumGeometries(); i++) {
-           var transformGeom = this$1.transformLineString(geom.getGeometryN(i), geom);
-           if (transformGeom === null) { continue }
-           if (transformGeom.isEmpty()) { continue }
-           transGeomList.add(transformGeom);
-         }
-         return this._factory.buildGeometry(transGeomList)
-       };
-       GeometryTransformer.prototype.transformCoordinates = function transformCoordinates (coords, parent) {
-         return this.copy(coords)
-       };
-       GeometryTransformer.prototype.transformLineString = function transformLineString (geom, parent) {
-         return this._factory.createLineString(this.transformCoordinates(geom.getCoordinateSequence(), geom))
-       };
-       GeometryTransformer.prototype.transformMultiPoint = function transformMultiPoint (geom, parent) {
-           var this$1 = this;
+           if (errors.length) {
+             return _t('commit.outstanding_errors_message', {
+               count: errors.length
+             });
+           } else {
+             var hasChangesetComment = context.changeset && context.changeset.tags.comment && context.changeset.tags.comment.trim().length;
 
-         var transGeomList = new ArrayList();
-         for (var i = 0; i < geom.getNumGeometries(); i++) {
-           var transformGeom = this$1.transformPoint(geom.getGeometryN(i), geom);
-           if (transformGeom === null) { continue }
-           if (transformGeom.isEmpty()) { continue }
-           transGeomList.add(transformGeom);
-         }
-         return this._factory.buildGeometry(transGeomList)
-       };
-       GeometryTransformer.prototype.transformMultiPolygon = function transformMultiPolygon (geom, parent) {
-           var this$1 = this;
+             if (!hasChangesetComment) {
+               return _t('commit.comment_needed_message');
+             }
+           }
 
-         var transGeomList = new ArrayList();
-         for (var i = 0; i < geom.getNumGeometries(); i++) {
-           var transformGeom = this$1.transformPolygon(geom.getGeometryN(i), geom);
-           if (transformGeom === null) { continue }
-           if (transformGeom.isEmpty()) { continue }
-           transGeomList.add(transformGeom);
+           return null;
          }
-         return this._factory.buildGeometry(transGeomList)
-       };
-       GeometryTransformer.prototype.copy = function copy (seq) {
-         return seq.copy()
-       };
-       GeometryTransformer.prototype.transformGeometryCollection = function transformGeometryCollection (geom, parent) {
-           var this$1 = this;
-
-         var transGeomList = new ArrayList();
-         for (var i = 0; i < geom.getNumGeometries(); i++) {
-           var transformGeom = this$1.transform(geom.getGeometryN(i));
-           if (transformGeom === null) { continue }
-           if (this$1._pruneEmptyGeometry && transformGeom.isEmpty()) { continue }
-           transGeomList.add(transformGeom);
-         }
-         if (this._preserveGeometryCollectionType) { return this._factory.createGeometryCollection(GeometryFactory.toGeometryArray(transGeomList)) }
-         return this._factory.buildGeometry(transGeomList)
-       };
-       GeometryTransformer.prototype.transform = function transform (inputGeom) {
-         this._inputGeom = inputGeom;
-         this._factory = inputGeom.getFactory();
-         if (inputGeom instanceof Point$1) { return this.transformPoint(inputGeom, null) }
-         if (inputGeom instanceof MultiPoint) { return this.transformMultiPoint(inputGeom, null) }
-         if (inputGeom instanceof LinearRing) { return this.transformLinearRing(inputGeom, null) }
-         if (inputGeom instanceof LineString) { return this.transformLineString(inputGeom, null) }
-         if (inputGeom instanceof MultiLineString) { return this.transformMultiLineString(inputGeom, null) }
-         if (inputGeom instanceof Polygon) { return this.transformPolygon(inputGeom, null) }
-         if (inputGeom instanceof MultiPolygon) { return this.transformMultiPolygon(inputGeom, null) }
-         if (inputGeom instanceof GeometryCollection) { return this.transformGeometryCollection(inputGeom, null) }
-         throw new IllegalArgumentException('Unknown Geometry subtype: ' + inputGeom.getClass().getName())
-       };
-       GeometryTransformer.prototype.transformLinearRing = function transformLinearRing (geom, parent) {
-         var seq = this.transformCoordinates(geom.getCoordinateSequence(), geom);
-         if (seq === null) { return this._factory.createLinearRing(null) }
-         var seqSize = seq.size();
-         if (seqSize > 0 && seqSize < 4 && !this._preserveType) { return this._factory.createLineString(seq) }
-         return this._factory.createLinearRing(seq)
-       };
-       GeometryTransformer.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       GeometryTransformer.prototype.getClass = function getClass () {
-         return GeometryTransformer
-       };
 
-       var LineStringSnapper = function LineStringSnapper () {
-         this._snapTolerance = 0.0;
-         this._srcPts = null;
-         this._seg = new LineSegment();
-         this._allowSnappingToSourceVertices = false;
-         this._isClosed = false;
-         if (arguments[0] instanceof LineString && typeof arguments[1] === 'number') {
-           var srcLine = arguments[0];
-           var snapTolerance = arguments[1];
-           LineStringSnapper.call(this, srcLine.getCoordinates(), snapTolerance);
-         } else if (arguments[0] instanceof Array && typeof arguments[1] === 'number') {
-           var srcPts = arguments[0];
-           var snapTolerance$1 = arguments[1];
-           this._srcPts = srcPts;
-           this._isClosed = LineStringSnapper.isClosed(srcPts);
-           this._snapTolerance = snapTolerance$1;
-         }
-       };
-       LineStringSnapper.prototype.snapVertices = function snapVertices (srcCoords, snapPts) {
-           var this$1 = this;
+         function changeTags(_, changed, onInput) {
+           if (changed.hasOwnProperty('comment')) {
+             if (changed.comment === undefined) {
+               changed.comment = '';
+             }
 
-         var end = this._isClosed ? srcCoords.size() - 1 : srcCoords.size();
-         for (var i = 0; i < end; i++) {
-           var srcPt = srcCoords.get(i);
-           var snapVert = this$1.findSnapForVertex(srcPt, snapPts);
-           if (snapVert !== null) {
-             srcCoords.set(i, new Coordinate(snapVert));
-             if (i === 0 && this$1._isClosed) { srcCoords.set(srcCoords.size() - 1, new Coordinate(snapVert)); }
+             if (!onInput) {
+               corePreferences('comment', changed.comment);
+               corePreferences('commentDate', Date.now());
+             }
            }
-         }
-       };
-       LineStringSnapper.prototype.findSnapForVertex = function findSnapForVertex (pt, snapPts) {
-           var this$1 = this;
 
-         for (var i = 0; i < snapPts.length; i++) {
-           if (pt.equals2D(snapPts[i])) { return null }
-           if (pt.distance(snapPts[i]) < this$1._snapTolerance) { return snapPts[i] }
-         }
-         return null
-       };
-       LineStringSnapper.prototype.snapTo = function snapTo (snapPts) {
-         var coordList = new CoordinateList(this._srcPts);
-         this.snapVertices(coordList, snapPts);
-         this.snapSegments(coordList, snapPts);
-         var newPts = coordList.toCoordinateArray();
-         return newPts
-       };
-       LineStringSnapper.prototype.snapSegments = function snapSegments (srcCoords, snapPts) {
-           var this$1 = this;
+           if (changed.hasOwnProperty('source')) {
+             if (changed.source === undefined) {
+               corePreferences('source', null);
+             } else if (!onInput) {
+               corePreferences('source', changed.source);
+               corePreferences('commentDate', Date.now());
+             }
+           } // no need to update `prefs` for `hashtags` here since it's done in `updateChangeset`
+
 
-         if (snapPts.length === 0) { return null }
-         var distinctPtCount = snapPts.length;
-         if (snapPts[0].equals2D(snapPts[snapPts.length - 1])) { distinctPtCount = snapPts.length - 1; }
-         for (var i = 0; i < distinctPtCount; i++) {
-           var snapPt = snapPts[i];
-           var index = this$1.findSegmentIndexToSnap(snapPt, srcCoords);
-           if (index >= 0) {
-             srcCoords.add(index + 1, new Coordinate(snapPt), false);
+           updateChangeset(changed, onInput);
+
+           if (_selection) {
+             _selection.call(render);
            }
          }
-       };
-       LineStringSnapper.prototype.findSegmentIndexToSnap = function findSegmentIndexToSnap (snapPt, srcCoords) {
-           var this$1 = this;
 
-         var minDist = Double.MAX_VALUE;
-         var snapIndex = -1;
-         for (var i = 0; i < srcCoords.size() - 1; i++) {
-           this$1._seg.p0 = srcCoords.get(i);
-           this$1._seg.p1 = srcCoords.get(i + 1);
-           if (this$1._seg.p0.equals2D(snapPt) || this$1._seg.p1.equals2D(snapPt)) {
-             if (this$1._allowSnappingToSourceVertices) { continue; } else { return -1 }
+         function findHashtags(tags, commentOnly) {
+           var detectedHashtags = commentHashtags();
+
+           if (detectedHashtags.length) {
+             // always remove stored hashtags if there are hashtags in the comment - #4304
+             corePreferences('hashtags', null);
            }
-           var dist = this$1._seg.distance(snapPt);
-           if (dist < this$1._snapTolerance && dist < minDist) {
-             minDist = dist;
-             snapIndex = i;
+
+           if (!detectedHashtags.length || !commentOnly) {
+             detectedHashtags = detectedHashtags.concat(hashtagHashtags());
            }
-         }
-         return snapIndex
-       };
-       LineStringSnapper.prototype.setAllowSnappingToSourceVertices = function setAllowSnappingToSourceVertices (allowSnappingToSourceVertices) {
-         this._allowSnappingToSourceVertices = allowSnappingToSourceVertices;
-       };
-       LineStringSnapper.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       LineStringSnapper.prototype.getClass = function getClass () {
-         return LineStringSnapper
-       };
-       LineStringSnapper.isClosed = function isClosed (pts) {
-         if (pts.length <= 1) { return false }
-         return pts[0].equals2D(pts[pts.length - 1])
-       };
 
-       var GeometrySnapper = function GeometrySnapper (srcGeom) {
-         this._srcGeom = srcGeom || null;
-       };
+           var allLowerCase = new Set();
+           return detectedHashtags.filter(function (hashtag) {
+             // Compare tags as lowercase strings, but keep original case tags
+             var lowerCase = hashtag.toLowerCase();
 
-       var staticAccessors$41 = { SNAP_PRECISION_FACTOR: { configurable: true } };
-       GeometrySnapper.prototype.snapTo = function snapTo (snapGeom, snapTolerance) {
-         var snapPts = this.extractTargetCoordinates(snapGeom);
-         var snapTrans = new SnapTransformer(snapTolerance, snapPts);
-         return snapTrans.transform(this._srcGeom)
-       };
-       GeometrySnapper.prototype.snapToSelf = function snapToSelf (snapTolerance, cleanResult) {
-         var snapPts = this.extractTargetCoordinates(this._srcGeom);
-         var snapTrans = new SnapTransformer(snapTolerance, snapPts, true);
-         var snappedGeom = snapTrans.transform(this._srcGeom);
-         var result = snappedGeom;
-         if (cleanResult && hasInterface(result, Polygonal)) {
-           result = snappedGeom.buffer(0);
-         }
-         return result
-       };
-       GeometrySnapper.prototype.computeSnapTolerance = function computeSnapTolerance (ringPts) {
-         var minSegLen = this.computeMinimumSegmentLength(ringPts);
-         var snapTol = minSegLen / 10;
-         return snapTol
-       };
-       GeometrySnapper.prototype.extractTargetCoordinates = function extractTargetCoordinates (g) {
-         var ptSet = new TreeSet();
-         var pts = g.getCoordinates();
-         for (var i = 0; i < pts.length; i++) {
-           ptSet.add(pts[i]);
-         }
-         return ptSet.toArray(new Array(0).fill(null))
-       };
-       GeometrySnapper.prototype.computeMinimumSegmentLength = function computeMinimumSegmentLength (pts) {
-         var minSegLen = Double.MAX_VALUE;
-         for (var i = 0; i < pts.length - 1; i++) {
-           var segLen = pts[i].distance(pts[i + 1]);
-           if (segLen < minSegLen) { minSegLen = segLen; }
-         }
-         return minSegLen
-       };
-       GeometrySnapper.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       GeometrySnapper.prototype.getClass = function getClass () {
-         return GeometrySnapper
-       };
-       GeometrySnapper.snap = function snap (g0, g1, snapTolerance) {
-         var snapGeom = new Array(2).fill(null);
-         var snapper0 = new GeometrySnapper(g0);
-         snapGeom[0] = snapper0.snapTo(g1, snapTolerance);
-         var snapper1 = new GeometrySnapper(g1);
-         snapGeom[1] = snapper1.snapTo(snapGeom[0], snapTolerance);
-         return snapGeom
-       };
-       GeometrySnapper.computeOverlaySnapTolerance = function computeOverlaySnapTolerance () {
-         if (arguments.length === 1) {
-           var g = arguments[0];
-           var snapTolerance = GeometrySnapper.computeSizeBasedSnapTolerance(g);
-           var pm = g.getPrecisionModel();
-           if (pm.getType() === PrecisionModel.FIXED) {
-             var fixedSnapTol = 1 / pm.getScale() * 2 / 1.415;
-             if (fixedSnapTol > snapTolerance) { snapTolerance = fixedSnapTol; }
-           }
-           return snapTolerance
-         } else if (arguments.length === 2) {
-           var g0 = arguments[0];
-           var g1 = arguments[1];
-           return Math.min(GeometrySnapper.computeOverlaySnapTolerance(g0), GeometrySnapper.computeOverlaySnapTolerance(g1))
-         }
-       };
-       GeometrySnapper.computeSizeBasedSnapTolerance = function computeSizeBasedSnapTolerance (g) {
-         var env = g.getEnvelopeInternal();
-         var minDimension = Math.min(env.getHeight(), env.getWidth());
-         var snapTol = minDimension * GeometrySnapper.SNAP_PRECISION_FACTOR;
-         return snapTol
-       };
-       GeometrySnapper.snapToSelf = function snapToSelf (geom, snapTolerance, cleanResult) {
-         var snapper0 = new GeometrySnapper(geom);
-         return snapper0.snapToSelf(snapTolerance, cleanResult)
-       };
-       staticAccessors$41.SNAP_PRECISION_FACTOR.get = function () { return 1e-9 };
+             if (!allLowerCase.has(lowerCase)) {
+               allLowerCase.add(lowerCase);
+               return true;
+             }
 
-       Object.defineProperties( GeometrySnapper, staticAccessors$41 );
+             return false;
+           }); // Extract hashtags from `comment`
 
-       var SnapTransformer = (function (GeometryTransformer$$1) {
-         function SnapTransformer (snapTolerance, snapPts, isSelfSnap) {
-           GeometryTransformer$$1.call(this);
-           this._snapTolerance = snapTolerance || null;
-           this._snapPts = snapPts || null;
-           this._isSelfSnap = (isSelfSnap !== undefined) ? isSelfSnap : false;
-         }
+           function commentHashtags() {
+             var matches = (tags.comment || '').replace(/http\S*/g, '') // drop anything that looks like a URL - #4289
+             .match(hashtagRegex);
+             return matches || [];
+           } // Extract and clean hashtags from `hashtags`
 
-         if ( GeometryTransformer$$1 ) SnapTransformer.__proto__ = GeometryTransformer$$1;
-         SnapTransformer.prototype = Object.create( GeometryTransformer$$1 && GeometryTransformer$$1.prototype );
-         SnapTransformer.prototype.constructor = SnapTransformer;
-         SnapTransformer.prototype.snapLine = function snapLine (srcPts, snapPts) {
-           var snapper = new LineStringSnapper(srcPts, this._snapTolerance);
-           snapper.setAllowSnappingToSourceVertices(this._isSelfSnap);
-           return snapper.snapTo(snapPts)
-         };
-         SnapTransformer.prototype.transformCoordinates = function transformCoordinates (coords, parent) {
-           var srcPts = coords.toCoordinateArray();
-           var newPts = this.snapLine(srcPts, this._snapPts);
-           return this._factory.getCoordinateSequenceFactory().create(newPts)
-         };
-         SnapTransformer.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         SnapTransformer.prototype.getClass = function getClass () {
-           return SnapTransformer
-         };
 
-         return SnapTransformer;
-       }(GeometryTransformer));
+           function hashtagHashtags() {
+             var matches = (tags.hashtags || '').split(/[,;\s]+/).map(function (s) {
+               if (s[0] !== '#') {
+                 s = '#' + s;
+               } // prepend '#'
 
-       var CommonBits = function CommonBits () {
-         this._isFirst = true;
-         this._commonMantissaBitsCount = 53;
-         this._commonBits = 0;
-         this._commonSignExp = null;
-       };
-       CommonBits.prototype.getCommon = function getCommon () {
-         return Double.longBitsToDouble(this._commonBits)
-       };
-       CommonBits.prototype.add = function add (num) {
-         var numBits = Double.doubleToLongBits(num);
-         if (this._isFirst) {
-           this._commonBits = numBits;
-           this._commonSignExp = CommonBits.signExpBits(this._commonBits);
-           this._isFirst = false;
-           return null
-         }
-         var numSignExp = CommonBits.signExpBits(numBits);
-         if (numSignExp !== this._commonSignExp) {
-           this._commonBits = 0;
-           return null
-         }
-         this._commonMantissaBitsCount = CommonBits.numCommonMostSigMantissaBits(this._commonBits, numBits);
-         this._commonBits = CommonBits.zeroLowerBits(this._commonBits, 64 - (12 + this._commonMantissaBitsCount));
-       };
-       CommonBits.prototype.toString = function toString () {
-         if (arguments.length === 1) {
-           var bits = arguments[0];
-           var x = Double.longBitsToDouble(bits);
-           var numStr = Double.toBinaryString(bits);
-           var padStr = '0000000000000000000000000000000000000000000000000000000000000000' + numStr;
-           var bitStr = padStr.substring(padStr.length - 64);
-           var str = bitStr.substring(0, 1) + '  ' + bitStr.substring(1, 12) + '(exp) ' + bitStr.substring(12) + ' [ ' + x + ' ]';
-           return str
+
+               var matched = s.match(hashtagRegex);
+               return matched && matched[0];
+             }).filter(Boolean); // exclude falsy
+
+             return matches || [];
+           }
          }
-       };
-       CommonBits.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       CommonBits.prototype.getClass = function getClass () {
-         return CommonBits
-       };
-       CommonBits.getBit = function getBit (bits, i) {
-         var mask = 1 << i;
-         return (bits & mask) !== 0 ? 1 : 0
-       };
-       CommonBits.signExpBits = function signExpBits (num) {
-         return num >> 52
-       };
-       CommonBits.zeroLowerBits = function zeroLowerBits (bits, nBits) {
-         var invMask = (1 << nBits) - 1;
-         var mask = ~invMask;
-         var zeroed = bits & mask;
-         return zeroed
-       };
-       CommonBits.numCommonMostSigMantissaBits = function numCommonMostSigMantissaBits (num1, num2) {
-         var count = 0;
-         for (var i = 52; i >= 0; i--) {
-           if (CommonBits.getBit(num1, i) !== CommonBits.getBit(num2, i)) { return count }
-           count++;
+
+         function isReviewRequested(tags) {
+           var rr = tags.review_requested;
+           if (rr === undefined) return false;
+           rr = rr.trim().toLowerCase();
+           return !(rr === '' || rr === 'no');
          }
-         return 52
-       };
 
-       var CommonBitsRemover = function CommonBitsRemover () {
-         this._commonCoord = null;
-         this._ccFilter = new CommonCoordinateFilter();
-       };
+         function updateChangeset(changed, onInput) {
+           var tags = Object.assign({}, context.changeset.tags); // shallow copy
 
-       var staticAccessors$42 = { CommonCoordinateFilter: { configurable: true },Translater: { configurable: true } };
-       CommonBitsRemover.prototype.addCommonBits = function addCommonBits (geom) {
-         var trans = new Translater(this._commonCoord);
-         geom.apply(trans);
-         geom.geometryChanged();
-       };
-       CommonBitsRemover.prototype.removeCommonBits = function removeCommonBits (geom) {
-         if (this._commonCoord.x === 0.0 && this._commonCoord.y === 0.0) { return geom }
-         var invCoord = new Coordinate(this._commonCoord);
-         invCoord.x = -invCoord.x;
-         invCoord.y = -invCoord.y;
-         var trans = new Translater(invCoord);
-         geom.apply(trans);
-         geom.geometryChanged();
-         return geom
-       };
-       CommonBitsRemover.prototype.getCommonCoordinate = function getCommonCoordinate () {
-         return this._commonCoord
-       };
-       CommonBitsRemover.prototype.add = function add (geom) {
-         geom.apply(this._ccFilter);
-         this._commonCoord = this._ccFilter.getCommonCoordinate();
-       };
-       CommonBitsRemover.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       CommonBitsRemover.prototype.getClass = function getClass () {
-         return CommonBitsRemover
-       };
-       staticAccessors$42.CommonCoordinateFilter.get = function () { return CommonCoordinateFilter };
-       staticAccessors$42.Translater.get = function () { return Translater };
+           Object.keys(changed).forEach(function (k) {
+             var v = changed[k];
+             k = context.cleanTagKey(k);
+             if (readOnlyTags.indexOf(k) !== -1) return;
 
-       Object.defineProperties( CommonBitsRemover, staticAccessors$42 );
+             if (v === undefined) {
+               delete tags[k];
+             } else if (onInput) {
+               tags[k] = v;
+             } else {
+               tags[k] = context.cleanTagValue(v);
+             }
+           });
 
-       var CommonCoordinateFilter = function CommonCoordinateFilter () {
-         this._commonBitsX = new CommonBits();
-         this._commonBitsY = new CommonBits();
-       };
-       CommonCoordinateFilter.prototype.filter = function filter (coord) {
-         this._commonBitsX.add(coord.x);
-         this._commonBitsY.add(coord.y);
-       };
-       CommonCoordinateFilter.prototype.getCommonCoordinate = function getCommonCoordinate () {
-         return new Coordinate(this._commonBitsX.getCommon(), this._commonBitsY.getCommon())
-       };
-       CommonCoordinateFilter.prototype.interfaces_ = function interfaces_ () {
-         return [CoordinateFilter]
-       };
-       CommonCoordinateFilter.prototype.getClass = function getClass () {
-         return CommonCoordinateFilter
-       };
+           if (!onInput) {
+             // when changing the comment, override hashtags with any found in comment.
+             var commentOnly = changed.hasOwnProperty('comment') && changed.comment !== '';
+             var arr = findHashtags(tags, commentOnly);
 
-       var Translater = function Translater () {
-         this.trans = null;
-         var trans = arguments[0];
-         this.trans = trans;
-       };
-       Translater.prototype.filter = function filter (seq, i) {
-         var xp = seq.getOrdinate(i, 0) + this.trans.x;
-         var yp = seq.getOrdinate(i, 1) + this.trans.y;
-         seq.setOrdinate(i, 0, xp);
-         seq.setOrdinate(i, 1, yp);
-       };
-       Translater.prototype.isDone = function isDone () {
-         return false
-       };
-       Translater.prototype.isGeometryChanged = function isGeometryChanged () {
-         return true
-       };
-       Translater.prototype.interfaces_ = function interfaces_ () {
-         return [CoordinateSequenceFilter]
-       };
-       Translater.prototype.getClass = function getClass () {
-         return Translater
-       };
+             if (arr.length) {
+               tags.hashtags = context.cleanTagValue(arr.join(';'));
+               corePreferences('hashtags', tags.hashtags);
+             } else {
+               delete tags.hashtags;
+               corePreferences('hashtags', null);
+             }
+           } // always update userdetails, just in case user reauthenticates as someone else
 
-       var SnapOverlayOp = function SnapOverlayOp (g1, g2) {
-         this._geom = new Array(2).fill(null);
-         this._snapTolerance = null;
-         this._cbr = null;
-         this._geom[0] = g1;
-         this._geom[1] = g2;
-         this.computeSnapTolerance();
-       };
-       SnapOverlayOp.prototype.selfSnap = function selfSnap (geom) {
-         var snapper0 = new GeometrySnapper(geom);
-         var snapGeom = snapper0.snapTo(geom, this._snapTolerance);
-         return snapGeom
-       };
-       SnapOverlayOp.prototype.removeCommonBits = function removeCommonBits (geom) {
-         this._cbr = new CommonBitsRemover();
-         this._cbr.add(geom[0]);
-         this._cbr.add(geom[1]);
-         var remGeom = new Array(2).fill(null);
-         remGeom[0] = this._cbr.removeCommonBits(geom[0].copy());
-         remGeom[1] = this._cbr.removeCommonBits(geom[1].copy());
-         return remGeom
-       };
-       SnapOverlayOp.prototype.prepareResult = function prepareResult (geom) {
-         this._cbr.addCommonBits(geom);
-         return geom
-       };
-       SnapOverlayOp.prototype.getResultGeometry = function getResultGeometry (opCode) {
-         var prepGeom = this.snap(this._geom);
-         var result = OverlayOp.overlayOp(prepGeom[0], prepGeom[1], opCode);
-         return this.prepareResult(result)
-       };
-       SnapOverlayOp.prototype.checkValid = function checkValid (g) {
-         if (!g.isValid()) {
-           System.out.println('Snapped geometry is invalid');
-         }
-       };
-       SnapOverlayOp.prototype.computeSnapTolerance = function computeSnapTolerance () {
-         this._snapTolerance = GeometrySnapper.computeOverlaySnapTolerance(this._geom[0], this._geom[1]);
-       };
-       SnapOverlayOp.prototype.snap = function snap (geom) {
-         var remGeom = this.removeCommonBits(geom);
-         var snapGeom = GeometrySnapper.snap(remGeom[0], remGeom[1], this._snapTolerance);
-         return snapGeom
-       };
-       SnapOverlayOp.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       SnapOverlayOp.prototype.getClass = function getClass () {
-         return SnapOverlayOp
-       };
-       SnapOverlayOp.overlayOp = function overlayOp (g0, g1, opCode) {
-         var op = new SnapOverlayOp(g0, g1);
-         return op.getResultGeometry(opCode)
-       };
-       SnapOverlayOp.union = function union (g0, g1) {
-         return SnapOverlayOp.overlayOp(g0, g1, OverlayOp.UNION)
-       };
-       SnapOverlayOp.intersection = function intersection (g0, g1) {
-         return SnapOverlayOp.overlayOp(g0, g1, OverlayOp.INTERSECTION)
-       };
-       SnapOverlayOp.symDifference = function symDifference (g0, g1) {
-         return SnapOverlayOp.overlayOp(g0, g1, OverlayOp.SYMDIFFERENCE)
-       };
-       SnapOverlayOp.difference = function difference (g0, g1) {
-         return SnapOverlayOp.overlayOp(g0, g1, OverlayOp.DIFFERENCE)
-       };
 
-       var SnapIfNeededOverlayOp = function SnapIfNeededOverlayOp (g1, g2) {
-         this._geom = new Array(2).fill(null);
-         this._geom[0] = g1;
-         this._geom[1] = g2;
-       };
-       SnapIfNeededOverlayOp.prototype.getResultGeometry = function getResultGeometry (opCode) {
-         var result = null;
-         var isSuccess = false;
-         var savedException = null;
-         try {
-           result = OverlayOp.overlayOp(this._geom[0], this._geom[1], opCode);
-           var isValid = true;
-           if (isValid) { isSuccess = true; }
-         } catch (ex) {
-           if (ex instanceof RuntimeException) {
-             savedException = ex;
-           } else { throw ex }
-         } finally {}
-         if (!isSuccess) {
-           try {
-             result = SnapOverlayOp.overlayOp(this._geom[0], this._geom[1], opCode);
-           } catch (ex) {
-             if (ex instanceof RuntimeException) {
-               throw savedException
-             } else { throw ex }
-           } finally {}
-         }
-         return result
-       };
-       SnapIfNeededOverlayOp.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       SnapIfNeededOverlayOp.prototype.getClass = function getClass () {
-         return SnapIfNeededOverlayOp
-       };
-       SnapIfNeededOverlayOp.overlayOp = function overlayOp (g0, g1, opCode) {
-         var op = new SnapIfNeededOverlayOp(g0, g1);
-         return op.getResultGeometry(opCode)
-       };
-       SnapIfNeededOverlayOp.union = function union (g0, g1) {
-         return SnapIfNeededOverlayOp.overlayOp(g0, g1, OverlayOp.UNION)
-       };
-       SnapIfNeededOverlayOp.intersection = function intersection (g0, g1) {
-         return SnapIfNeededOverlayOp.overlayOp(g0, g1, OverlayOp.INTERSECTION)
-       };
-       SnapIfNeededOverlayOp.symDifference = function symDifference (g0, g1) {
-         return SnapIfNeededOverlayOp.overlayOp(g0, g1, OverlayOp.SYMDIFFERENCE)
-       };
-       SnapIfNeededOverlayOp.difference = function difference (g0, g1) {
-         return SnapIfNeededOverlayOp.overlayOp(g0, g1, OverlayOp.DIFFERENCE)
-       };
+           if (_userDetails && _userDetails.changesets_count !== undefined) {
+             var changesetsCount = parseInt(_userDetails.changesets_count, 10) + 1; // #4283
 
-       var MonotoneChain$2 = function MonotoneChain () {
-         this.mce = null;
-         this.chainIndex = null;
-         var mce = arguments[0];
-         var chainIndex = arguments[1];
-         this.mce = mce;
-         this.chainIndex = chainIndex;
-       };
-       MonotoneChain$2.prototype.computeIntersections = function computeIntersections (mc, si) {
-         this.mce.computeIntersectsForChain(this.chainIndex, mc.mce, mc.chainIndex, si);
-       };
-       MonotoneChain$2.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       MonotoneChain$2.prototype.getClass = function getClass () {
-         return MonotoneChain$2
-       };
+             tags.changesets_count = String(changesetsCount); // first 100 edits - new user
 
-       var SweepLineEvent = function SweepLineEvent () {
-         this._label = null;
-         this._xValue = null;
-         this._eventType = null;
-         this._insertEvent = null;
-         this._deleteEventIndex = null;
-         this._obj = null;
-         if (arguments.length === 2) {
-           var x = arguments[0];
-           var insertEvent = arguments[1];
-           this._eventType = SweepLineEvent.DELETE;
-           this._xValue = x;
-           this._insertEvent = insertEvent;
-         } else if (arguments.length === 3) {
-           var label = arguments[0];
-           var x$1 = arguments[1];
-           var obj = arguments[2];
-           this._eventType = SweepLineEvent.INSERT;
-           this._label = label;
-           this._xValue = x$1;
-           this._obj = obj;
-         }
-       };
+             if (changesetsCount <= 100) {
+               var s;
+               s = corePreferences('walkthrough_completed');
 
-       var staticAccessors$43 = { INSERT: { configurable: true },DELETE: { configurable: true } };
-       SweepLineEvent.prototype.isDelete = function isDelete () {
-         return this._eventType === SweepLineEvent.DELETE
-       };
-       SweepLineEvent.prototype.setDeleteEventIndex = function setDeleteEventIndex (deleteEventIndex) {
-         this._deleteEventIndex = deleteEventIndex;
-       };
-       SweepLineEvent.prototype.getObject = function getObject () {
-         return this._obj
-       };
-       SweepLineEvent.prototype.compareTo = function compareTo (o) {
-         var pe = o;
-         if (this._xValue < pe._xValue) { return -1 }
-         if (this._xValue > pe._xValue) { return 1 }
-         if (this._eventType < pe._eventType) { return -1 }
-         if (this._eventType > pe._eventType) { return 1 }
-         return 0
-       };
-       SweepLineEvent.prototype.getInsertEvent = function getInsertEvent () {
-         return this._insertEvent
-       };
-       SweepLineEvent.prototype.isInsert = function isInsert () {
-         return this._eventType === SweepLineEvent.INSERT
-       };
-       SweepLineEvent.prototype.isSameLabel = function isSameLabel (ev) {
-         if (this._label === null) { return false }
-         return this._label === ev._label
-       };
-       SweepLineEvent.prototype.getDeleteEventIndex = function getDeleteEventIndex () {
-         return this._deleteEventIndex
-       };
-       SweepLineEvent.prototype.interfaces_ = function interfaces_ () {
-         return [Comparable]
-       };
-       SweepLineEvent.prototype.getClass = function getClass () {
-         return SweepLineEvent
-       };
-       staticAccessors$43.INSERT.get = function () { return 1 };
-       staticAccessors$43.DELETE.get = function () { return 2 };
+               if (s) {
+                 tags['ideditor:walkthrough_completed'] = s;
+               }
 
-       Object.defineProperties( SweepLineEvent, staticAccessors$43 );
+               s = corePreferences('walkthrough_progress');
 
-       var EdgeSetIntersector = function EdgeSetIntersector () {};
+               if (s) {
+                 tags['ideditor:walkthrough_progress'] = s;
+               }
 
-       EdgeSetIntersector.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       EdgeSetIntersector.prototype.getClass = function getClass () {
-         return EdgeSetIntersector
-       };
+               s = corePreferences('walkthrough_started');
 
-       var SegmentIntersector$2 = function SegmentIntersector () {
-         this._hasIntersection = false;
-         this._hasProper = false;
-         this._hasProperInterior = false;
-         this._properIntersectionPoint = null;
-         this._li = null;
-         this._includeProper = null;
-         this._recordIsolated = null;
-         this._isSelfIntersection = null;
-         this._numIntersections = 0;
-         this.numTests = 0;
-         this._bdyNodes = null;
-         this._isDone = false;
-         this._isDoneWhenProperInt = false;
-         var li = arguments[0];
-         var includeProper = arguments[1];
-         var recordIsolated = arguments[2];
-         this._li = li;
-         this._includeProper = includeProper;
-         this._recordIsolated = recordIsolated;
-       };
-       SegmentIntersector$2.prototype.isTrivialIntersection = function isTrivialIntersection (e0, segIndex0, e1, segIndex1) {
-         if (e0 === e1) {
-           if (this._li.getIntersectionNum() === 1) {
-             if (SegmentIntersector$2.isAdjacentSegments(segIndex0, segIndex1)) { return true }
-             if (e0.isClosed()) {
-               var maxSegIndex = e0.getNumPoints() - 1;
-               if ((segIndex0 === 0 && segIndex1 === maxSegIndex) ||
-                   (segIndex1 === 0 && segIndex0 === maxSegIndex)) {
-                 return true
+               if (s) {
+                 tags['ideditor:walkthrough_started'] = s;
                }
              }
+           } else {
+             delete tags.changesets_count;
            }
-         }
-         return false
-       };
-       SegmentIntersector$2.prototype.getProperIntersectionPoint = function getProperIntersectionPoint () {
-         return this._properIntersectionPoint
-       };
-       SegmentIntersector$2.prototype.setIsDoneIfProperInt = function setIsDoneIfProperInt (isDoneWhenProperInt) {
-         this._isDoneWhenProperInt = isDoneWhenProperInt;
-       };
-       SegmentIntersector$2.prototype.hasProperInteriorIntersection = function hasProperInteriorIntersection () {
-         return this._hasProperInterior
-       };
-       SegmentIntersector$2.prototype.isBoundaryPointInternal = function isBoundaryPointInternal (li, bdyNodes) {
-         for (var i = bdyNodes.iterator(); i.hasNext();) {
-           var node = i.next();
-           var pt = node.getCoordinate();
-           if (li.isIntersection(pt)) { return true }
-         }
-         return false
-       };
-       SegmentIntersector$2.prototype.hasProperIntersection = function hasProperIntersection () {
-         return this._hasProper
-       };
-       SegmentIntersector$2.prototype.hasIntersection = function hasIntersection () {
-         return this._hasIntersection
-       };
-       SegmentIntersector$2.prototype.isDone = function isDone () {
-         return this._isDone
-       };
-       SegmentIntersector$2.prototype.isBoundaryPoint = function isBoundaryPoint (li, bdyNodes) {
-         if (bdyNodes === null) { return false }
-         if (this.isBoundaryPointInternal(li, bdyNodes[0])) { return true }
-         if (this.isBoundaryPointInternal(li, bdyNodes[1])) { return true }
-         return false
-       };
-       SegmentIntersector$2.prototype.setBoundaryNodes = function setBoundaryNodes (bdyNodes0, bdyNodes1) {
-         this._bdyNodes = new Array(2).fill(null);
-         this._bdyNodes[0] = bdyNodes0;
-         this._bdyNodes[1] = bdyNodes1;
-       };
-       SegmentIntersector$2.prototype.addIntersections = function addIntersections (e0, segIndex0, e1, segIndex1) {
-         if (e0 === e1 && segIndex0 === segIndex1) { return null }
-         this.numTests++;
-         var p00 = e0.getCoordinates()[segIndex0];
-         var p01 = e0.getCoordinates()[segIndex0 + 1];
-         var p10 = e1.getCoordinates()[segIndex1];
-         var p11 = e1.getCoordinates()[segIndex1 + 1];
-         this._li.computeIntersection(p00, p01, p10, p11);
-         if (this._li.hasIntersection()) {
-           if (this._recordIsolated) {
-             e0.setIsolated(false);
-             e1.setIsolated(false);
-           }
-           this._numIntersections++;
-           if (!this.isTrivialIntersection(e0, segIndex0, e1, segIndex1)) {
-             this._hasIntersection = true;
-             if (this._includeProper || !this._li.isProper()) {
-               e0.addIntersections(this._li, segIndex0, 0);
-               e1.addIntersections(this._li, segIndex1, 1);
-             }
-             if (this._li.isProper()) {
-               this._properIntersectionPoint = this._li.getIntersection(0).copy();
-               this._hasProper = true;
-               if (this._isDoneWhenProperInt) {
-                 this._isDone = true;
-               }
-               if (!this.isBoundaryPoint(this._li, this._bdyNodes)) { this._hasProperInterior = true; }
-             }
+
+           if (!fastDeepEqual(context.changeset.tags, tags)) {
+             context.changeset = context.changeset.update({
+               tags: tags
+             });
            }
          }
+
+         commit.reset = function () {
+           context.changeset = null;
+         };
+
+         return utilRebind(commit, dispatch$1, 'on');
+       }
+
+       var globalIsFinite = global_1.isFinite;
+
+       // `Number.isFinite` method
+       // https://tc39.github.io/ecma262/#sec-number.isfinite
+       var numberIsFinite = Number.isFinite || function isFinite(it) {
+         return typeof it == 'number' && globalIsFinite(it);
        };
-       SegmentIntersector$2.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       SegmentIntersector$2.prototype.getClass = function getClass () {
-         return SegmentIntersector$2
-       };
-       SegmentIntersector$2.isAdjacentSegments = function isAdjacentSegments (i1, i2) {
-         return Math.abs(i1 - i2) === 1
+
+       // `Number.isFinite` method
+       // https://tc39.github.io/ecma262/#sec-number.isfinite
+       _export({ target: 'Number', stat: true }, { isFinite: numberIsFinite });
+
+       var RADIUS = 6378137;
+       var FLATTENING = 1 / 298.257223563;
+       var POLAR_RADIUS$1 = 6356752.3142;
+       var wgs84 = {
+         RADIUS: RADIUS,
+         FLATTENING: FLATTENING,
+         POLAR_RADIUS: POLAR_RADIUS$1
        };
 
-       var SimpleMCSweepLineIntersector = (function (EdgeSetIntersector$$1) {
-         function SimpleMCSweepLineIntersector () {
-           EdgeSetIntersector$$1.call(this);
-           this.events = new ArrayList();
-           this.nOverlaps = null;
-         }
+       var geometry_1 = geometry;
+       var ring = ringArea;
 
-         if ( EdgeSetIntersector$$1 ) SimpleMCSweepLineIntersector.__proto__ = EdgeSetIntersector$$1;
-         SimpleMCSweepLineIntersector.prototype = Object.create( EdgeSetIntersector$$1 && EdgeSetIntersector$$1.prototype );
-         SimpleMCSweepLineIntersector.prototype.constructor = SimpleMCSweepLineIntersector;
-         SimpleMCSweepLineIntersector.prototype.prepareEvents = function prepareEvents () {
-           var this$1 = this;
+       function geometry(_) {
+         var area = 0,
+             i;
 
-           Collections.sort(this.events);
-           for (var i = 0; i < this.events.size(); i++) {
-             var ev = this$1.events.get(i);
-             if (ev.isDelete()) {
-               ev.getInsertEvent().setDeleteEventIndex(i);
-             }
-           }
-         };
-         SimpleMCSweepLineIntersector.prototype.computeIntersections = function computeIntersections () {
-           var this$1 = this;
+         switch (_.type) {
+           case 'Polygon':
+             return polygonArea(_.coordinates);
 
-           if (arguments.length === 1) {
-             var si = arguments[0];
-             this.nOverlaps = 0;
-             this.prepareEvents();
-             for (var i = 0; i < this.events.size(); i++) {
-               var ev = this$1.events.get(i);
-               if (ev.isInsert()) {
-                 this$1.processOverlaps(i, ev.getDeleteEventIndex(), ev, si);
-               }
-               if (si.isDone()) {
-                 break
-               }
-             }
-           } else if (arguments.length === 3) {
-             if (arguments[2] instanceof SegmentIntersector$2 && (hasInterface(arguments[0], List) && hasInterface(arguments[1], List))) {
-               var edges0 = arguments[0];
-               var edges1 = arguments[1];
-               var si$1 = arguments[2];
-               this.addEdges(edges0, edges0);
-               this.addEdges(edges1, edges1);
-               this.computeIntersections(si$1);
-             } else if (typeof arguments[2] === 'boolean' && (hasInterface(arguments[0], List) && arguments[1] instanceof SegmentIntersector$2)) {
-               var edges = arguments[0];
-               var si$2 = arguments[1];
-               var testAllSegments = arguments[2];
-               if (testAllSegments) { this.addEdges(edges, null); } else { this.addEdges(edges); }
-               this.computeIntersections(si$2);
+           case 'MultiPolygon':
+             for (i = 0; i < _.coordinates.length; i++) {
+               area += polygonArea(_.coordinates[i]);
              }
-           }
-         };
-         SimpleMCSweepLineIntersector.prototype.addEdge = function addEdge (edge, edgeSet) {
-           var this$1 = this;
 
-           var mce = edge.getMonotoneChainEdge();
-           var startIndex = mce.getStartIndexes();
-           for (var i = 0; i < startIndex.length - 1; i++) {
-             var mc = new MonotoneChain$2(mce, i);
-             var insertEvent = new SweepLineEvent(edgeSet, mce.getMinX(i), mc);
-             this$1.events.add(insertEvent);
-             this$1.events.add(new SweepLineEvent(mce.getMaxX(i), insertEvent));
-           }
-         };
-         SimpleMCSweepLineIntersector.prototype.processOverlaps = function processOverlaps (start, end, ev0, si) {
-           var this$1 = this;
+             return area;
 
-           var mc0 = ev0.getObject();
-           for (var i = start; i < end; i++) {
-             var ev1 = this$1.events.get(i);
-             if (ev1.isInsert()) {
-               var mc1 = ev1.getObject();
-               if (!ev0.isSameLabel(ev1)) {
-                 mc0.computeIntersections(mc1, si);
-                 this$1.nOverlaps++;
-               }
+           case 'Point':
+           case 'MultiPoint':
+           case 'LineString':
+           case 'MultiLineString':
+             return 0;
+
+           case 'GeometryCollection':
+             for (i = 0; i < _.geometries.length; i++) {
+               area += geometry(_.geometries[i]);
              }
+
+             return area;
+         }
+       }
+
+       function polygonArea(coords) {
+         var area = 0;
+
+         if (coords && coords.length > 0) {
+           area += Math.abs(ringArea(coords[0]));
+
+           for (var i = 1; i < coords.length; i++) {
+             area -= Math.abs(ringArea(coords[i]));
            }
-         };
-         SimpleMCSweepLineIntersector.prototype.addEdges = function addEdges () {
-           var this$1 = this;
+         }
 
-           if (arguments.length === 1) {
-             var edges = arguments[0];
-             for (var i = edges.iterator(); i.hasNext();) {
-               var edge = i.next();
-               this$1.addEdge(edge, edge);
-             }
-           } else if (arguments.length === 2) {
-             var edges$1 = arguments[0];
-             var edgeSet = arguments[1];
-             for (var i$1 = edges$1.iterator(); i$1.hasNext();) {
-               var edge$1 = i$1.next();
-               this$1.addEdge(edge$1, edgeSet);
+         return area;
+       }
+       /**
+        * Calculate the approximate area of the polygon were it projected onto
+        *     the earth.  Note that this area will be positive if ring is oriented
+        *     clockwise, otherwise it will be negative.
+        *
+        * Reference:
+        * Robert. G. Chamberlain and William H. Duquette, "Some Algorithms for
+        *     Polygons on a Sphere", JPL Publication 07-03, Jet Propulsion
+        *     Laboratory, Pasadena, CA, June 2007 http://trs-new.jpl.nasa.gov/dspace/handle/2014/40409
+        *
+        * Returns:
+        * {float} The approximate signed geodesic area of the polygon in square
+        *     meters.
+        */
+
+
+       function ringArea(coords) {
+         var p1,
+             p2,
+             p3,
+             lowerIndex,
+             middleIndex,
+             upperIndex,
+             i,
+             area = 0,
+             coordsLength = coords.length;
+
+         if (coordsLength > 2) {
+           for (i = 0; i < coordsLength; i++) {
+             if (i === coordsLength - 2) {
+               // i = N-2
+               lowerIndex = coordsLength - 2;
+               middleIndex = coordsLength - 1;
+               upperIndex = 0;
+             } else if (i === coordsLength - 1) {
+               // i = N-1
+               lowerIndex = coordsLength - 1;
+               middleIndex = 0;
+               upperIndex = 1;
+             } else {
+               // i = 0 to N-3
+               lowerIndex = i;
+               middleIndex = i + 1;
+               upperIndex = i + 2;
              }
+
+             p1 = coords[lowerIndex];
+             p2 = coords[middleIndex];
+             p3 = coords[upperIndex];
+             area += (rad(p3[0]) - rad(p1[0])) * Math.sin(rad(p2[1]));
            }
-         };
-         SimpleMCSweepLineIntersector.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         SimpleMCSweepLineIntersector.prototype.getClass = function getClass () {
-           return SimpleMCSweepLineIntersector
-         };
 
-         return SimpleMCSweepLineIntersector;
-       }(EdgeSetIntersector));
+           area = area * wgs84.RADIUS * wgs84.RADIUS / 2;
+         }
+
+         return area;
+       }
+
+       function rad(_) {
+         return _ * Math.PI / 180;
+       }
 
-       var IntervalRTreeNode = function IntervalRTreeNode () {
-         this._min = Double.POSITIVE_INFINITY;
-         this._max = Double.NEGATIVE_INFINITY;
+       var geojsonArea = {
+         geometry: geometry_1,
+         ring: ring
        };
 
-       var staticAccessors$45 = { NodeComparator: { configurable: true } };
-       IntervalRTreeNode.prototype.getMin = function getMin () {
-         return this._min
-       };
-       IntervalRTreeNode.prototype.intersects = function intersects (queryMin, queryMax) {
-         if (this._min > queryMax || this._max < queryMin) { return false }
-         return true
-       };
-       IntervalRTreeNode.prototype.getMax = function getMax () {
-         return this._max
-       };
-       IntervalRTreeNode.prototype.toString = function toString () {
-         return WKTWriter.toLineString(new Coordinate(this._min, 0), new Coordinate(this._max, 0))
-       };
-       IntervalRTreeNode.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       IntervalRTreeNode.prototype.getClass = function getClass () {
-         return IntervalRTreeNode
-       };
-       staticAccessors$45.NodeComparator.get = function () { return NodeComparator };
+       function toRadians(angleInDegrees) {
+         return angleInDegrees * Math.PI / 180;
+       }
+
+       function toDegrees(angleInRadians) {
+         return angleInRadians * 180 / Math.PI;
+       }
 
-       Object.defineProperties( IntervalRTreeNode, staticAccessors$45 );
+       function offset(c1, distance, bearing) {
+         var lat1 = toRadians(c1[1]);
+         var lon1 = toRadians(c1[0]);
+         var dByR = distance / 6378137; // distance divided by 6378137 (radius of the earth) wgs84
 
-       var NodeComparator = function NodeComparator () {};
+         var lat = Math.asin(Math.sin(lat1) * Math.cos(dByR) + Math.cos(lat1) * Math.sin(dByR) * Math.cos(bearing));
+         var lon = lon1 + Math.atan2(Math.sin(bearing) * Math.sin(dByR) * Math.cos(lat1), Math.cos(dByR) - Math.sin(lat1) * Math.sin(lat));
+         return [toDegrees(lon), toDegrees(lat)];
+       }
 
-       NodeComparator.prototype.compare = function compare (o1, o2) {
-         var n1 = o1;
-         var n2 = o2;
-         var mid1 = (n1._min + n1._max) / 2;
-         var mid2 = (n2._min + n2._max) / 2;
-         if (mid1 < mid2) { return -1 }
-         if (mid1 > mid2) { return 1 }
-         return 0
-       };
-       NodeComparator.prototype.interfaces_ = function interfaces_ () {
-         return [Comparator]
-       };
-       NodeComparator.prototype.getClass = function getClass () {
-         return NodeComparator
-       };
+       function validateCenter(center) {
+         var validCenterLengths = [2, 3];
 
-       var IntervalRTreeLeafNode = (function (IntervalRTreeNode$$1) {
-         function IntervalRTreeLeafNode () {
-           IntervalRTreeNode$$1.call(this);
-           this._item = null;
-           var min = arguments[0];
-           var max = arguments[1];
-           var item = arguments[2];
-           this._min = min;
-           this._max = max;
-           this._item = item;
+         if (!Array.isArray(center) || !validCenterLengths.includes(center.length)) {
+           throw new Error("ERROR! Center has to be an array of length two or three");
          }
 
-         if ( IntervalRTreeNode$$1 ) IntervalRTreeLeafNode.__proto__ = IntervalRTreeNode$$1;
-         IntervalRTreeLeafNode.prototype = Object.create( IntervalRTreeNode$$1 && IntervalRTreeNode$$1.prototype );
-         IntervalRTreeLeafNode.prototype.constructor = IntervalRTreeLeafNode;
-         IntervalRTreeLeafNode.prototype.query = function query (queryMin, queryMax, visitor) {
-           if (!this.intersects(queryMin, queryMax)) { return null }
-           visitor.visitItem(this._item);
-         };
-         IntervalRTreeLeafNode.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         IntervalRTreeLeafNode.prototype.getClass = function getClass () {
-           return IntervalRTreeLeafNode
-         };
+         var _center = _slicedToArray(center, 2),
+             lng = _center[0],
+             lat = _center[1];
 
-         return IntervalRTreeLeafNode;
-       }(IntervalRTreeNode));
+         if (typeof lng !== "number" || typeof lat !== "number") {
+           throw new Error("ERROR! Longitude and Latitude has to be numbers but where ".concat(_typeof(lng), " and ").concat(_typeof(lat)));
+         }
 
-       var IntervalRTreeBranchNode = (function (IntervalRTreeNode$$1) {
-         function IntervalRTreeBranchNode () {
-           IntervalRTreeNode$$1.call(this);
-           this._node1 = null;
-           this._node2 = null;
-           var n1 = arguments[0];
-           var n2 = arguments[1];
-           this._node1 = n1;
-           this._node2 = n2;
-           this.buildExtent(this._node1, this._node2);
+         if (lng > 180 || lng < -180) {
+           throw new Error("ERROR! Longitude has to be between -180 and 180 but was ".concat(lng));
          }
 
-         if ( IntervalRTreeNode$$1 ) IntervalRTreeBranchNode.__proto__ = IntervalRTreeNode$$1;
-         IntervalRTreeBranchNode.prototype = Object.create( IntervalRTreeNode$$1 && IntervalRTreeNode$$1.prototype );
-         IntervalRTreeBranchNode.prototype.constructor = IntervalRTreeBranchNode;
-         IntervalRTreeBranchNode.prototype.buildExtent = function buildExtent (n1, n2) {
-           this._min = Math.min(n1._min, n2._min);
-           this._max = Math.max(n1._max, n2._max);
-         };
-         IntervalRTreeBranchNode.prototype.query = function query (queryMin, queryMax, visitor) {
-           if (!this.intersects(queryMin, queryMax)) {
-             return null
-           }
-           if (this._node1 !== null) { this._node1.query(queryMin, queryMax, visitor); }
-           if (this._node2 !== null) { this._node2.query(queryMin, queryMax, visitor); }
-         };
-         IntervalRTreeBranchNode.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         IntervalRTreeBranchNode.prototype.getClass = function getClass () {
-           return IntervalRTreeBranchNode
-         };
+         if (lat > 90 || lat < -90) {
+           throw new Error("ERROR! Latitude has to be between -90 and 90 but was ".concat(lat));
+         }
+       }
 
-         return IntervalRTreeBranchNode;
-       }(IntervalRTreeNode));
+       function validateRadius(radius) {
+         if (typeof radius !== "number") {
+           throw new Error("ERROR! Radius has to be a positive number but was: ".concat(_typeof(radius)));
+         }
 
-       var SortedPackedIntervalRTree = function SortedPackedIntervalRTree () {
-         this._leaves = new ArrayList();
-         this._root = null;
-         this._level = 0;
-       };
-       SortedPackedIntervalRTree.prototype.buildTree = function buildTree () {
-           var this$1 = this;
+         if (radius <= 0) {
+           throw new Error("ERROR! Radius has to be a positive number but was: ".concat(radius));
+         }
+       }
 
-         Collections.sort(this._leaves, new IntervalRTreeNode.NodeComparator());
-         var src = this._leaves;
-         var temp = null;
-         var dest = new ArrayList();
-         while (true) {
-           this$1.buildLevel(src, dest);
-           if (dest.size() === 1) { return dest.get(0) }
-           temp = src;
-           src = dest;
-           dest = temp;
+       function validateNumberOfSegments(numberOfSegments) {
+         if (typeof numberOfSegments !== "number" && numberOfSegments !== undefined) {
+           throw new Error("ERROR! Number of segments has to be a number but was: ".concat(_typeof(numberOfSegments)));
          }
-       };
-       SortedPackedIntervalRTree.prototype.insert = function insert (min, max, item) {
-         if (this._root !== null) { throw new Error('Index cannot be added to once it has been queried') }
-         this._leaves.add(new IntervalRTreeLeafNode(min, max, item));
-       };
-       SortedPackedIntervalRTree.prototype.query = function query (min, max, visitor) {
-         this.init();
-         this._root.query(min, max, visitor);
-       };
-       SortedPackedIntervalRTree.prototype.buildRoot = function buildRoot () {
-         if (this._root !== null) { return null }
-         this._root = this.buildTree();
-       };
-       SortedPackedIntervalRTree.prototype.printNode = function printNode (node) {
-         System.out.println(WKTWriter.toLineString(new Coordinate(node._min, this._level), new Coordinate(node._max, this._level)));
-       };
-       SortedPackedIntervalRTree.prototype.init = function init () {
-         if (this._root !== null) { return null }
-         this.buildRoot();
-       };
-       SortedPackedIntervalRTree.prototype.buildLevel = function buildLevel (src, dest) {
-         this._level++;
-         dest.clear();
-         for (var i = 0; i < src.size(); i += 2) {
-           var n1 = src.get(i);
-           var n2 = i + 1 < src.size() ? src.get(i) : null;
-           if (n2 === null) {
-             dest.add(n1);
-           } else {
-             var node = new IntervalRTreeBranchNode(src.get(i), src.get(i + 1));
-             dest.add(node);
-           }
+
+         if (numberOfSegments < 3) {
+           throw new Error("ERROR! Number of segments has to be at least 3 but was: ".concat(numberOfSegments));
          }
-       };
-       SortedPackedIntervalRTree.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       SortedPackedIntervalRTree.prototype.getClass = function getClass () {
-         return SortedPackedIntervalRTree
-       };
+       }
 
-       var ArrayListVisitor = function ArrayListVisitor () {
-         this._items = new ArrayList();
-       };
-       ArrayListVisitor.prototype.visitItem = function visitItem (item) {
-         this._items.add(item);
-       };
-       ArrayListVisitor.prototype.getItems = function getItems () {
-         return this._items
-       };
-       ArrayListVisitor.prototype.interfaces_ = function interfaces_ () {
-         return [ItemVisitor]
-       };
-       ArrayListVisitor.prototype.getClass = function getClass () {
-         return ArrayListVisitor
-       };
+       function validateInput(_ref) {
+         var center = _ref.center,
+             radius = _ref.radius,
+             numberOfSegments = _ref.numberOfSegments;
+         validateCenter(center);
+         validateRadius(radius);
+         validateNumberOfSegments(numberOfSegments);
+       }
 
-       var IndexedPointInAreaLocator = function IndexedPointInAreaLocator () {
-         this._index = null;
-         var g = arguments[0];
-         if (!hasInterface(g, Polygonal)) { throw new IllegalArgumentException('Argument must be Polygonal') }
-         this._index = new IntervalIndexedGeometry(g);
-       };
+       var circleToPolygon = function circleToPolygon(center, radius, numberOfSegments) {
+         var n = numberOfSegments ? numberOfSegments : 32; // validateInput() throws error on invalid input and do nothing on valid input
 
-       var staticAccessors$44 = { SegmentVisitor: { configurable: true },IntervalIndexedGeometry: { configurable: true } };
-       IndexedPointInAreaLocator.prototype.locate = function locate (p) {
-         var rcc = new RayCrossingCounter(p);
-         var visitor = new SegmentVisitor(rcc);
-         this._index.query(p.y, p.y, visitor);
-         return rcc.getLocation()
-       };
-       IndexedPointInAreaLocator.prototype.interfaces_ = function interfaces_ () {
-         return [PointOnGeometryLocator]
-       };
-       IndexedPointInAreaLocator.prototype.getClass = function getClass () {
-         return IndexedPointInAreaLocator
-       };
-       staticAccessors$44.SegmentVisitor.get = function () { return SegmentVisitor };
-       staticAccessors$44.IntervalIndexedGeometry.get = function () { return IntervalIndexedGeometry };
+         validateInput({
+           center: center,
+           radius: radius,
+           numberOfSegments: numberOfSegments
+         });
+         var coordinates = [];
 
-       Object.defineProperties( IndexedPointInAreaLocator, staticAccessors$44 );
+         for (var i = 0; i < n; ++i) {
+           coordinates.push(offset(center, radius, 2 * Math.PI * -i / n));
+         }
 
-       var SegmentVisitor = function SegmentVisitor () {
-         this._counter = null;
-         var counter = arguments[0];
-         this._counter = counter;
-       };
-       SegmentVisitor.prototype.visitItem = function visitItem (item) {
-         var seg = item;
-         this._counter.countSegment(seg.getCoordinate(0), seg.getCoordinate(1));
-       };
-       SegmentVisitor.prototype.interfaces_ = function interfaces_ () {
-         return [ItemVisitor]
-       };
-       SegmentVisitor.prototype.getClass = function getClass () {
-         return SegmentVisitor
+         coordinates.push(coordinates[0]);
+         return {
+           type: "Polygon",
+           coordinates: [coordinates]
+         };
        };
 
-       var IntervalIndexedGeometry = function IntervalIndexedGeometry () {
-         this._index = new SortedPackedIntervalRTree();
-         var geom = arguments[0];
-         this.init(geom);
-       };
-       IntervalIndexedGeometry.prototype.init = function init (geom) {
-           var this$1 = this;
+       // `Number.EPSILON` constant
+       // https://tc39.github.io/ecma262/#sec-number.epsilon
+       _export({ target: 'Number', stat: true }, {
+         EPSILON: Math.pow(2, -52)
+       });
 
-         var lines = LinearComponentExtracter.getLines(geom);
-         for (var i = lines.iterator(); i.hasNext();) {
-           var line = i.next();
-           var pts = line.getCoordinates();
-           this$1.addLine(pts);
-         }
-       };
-       IntervalIndexedGeometry.prototype.addLine = function addLine (pts) {
-           var this$1 = this;
+       /**
+        * splaytree v3.0.1
+        * Fast Splay tree for Node and browser
+        *
+        * @author Alexander Milevski <info@w8r.name>
+        * @license MIT
+        * @preserve
+        */
+       var Node$1 = function Node(key, data) {
+         _classCallCheck(this, Node);
 
-         for (var i = 1; i < pts.length; i++) {
-           var seg = new LineSegment(pts[i - 1], pts[i]);
-           var min = Math.min(seg.p0.y, seg.p1.y);
-           var max = Math.max(seg.p0.y, seg.p1.y);
-           this$1._index.insert(min, max, seg);
-         }
-       };
-       IntervalIndexedGeometry.prototype.query = function query () {
-         if (arguments.length === 2) {
-           var min = arguments[0];
-           var max = arguments[1];
-           var visitor = new ArrayListVisitor();
-           this._index.query(min, max, visitor);
-           return visitor.getItems()
-         } else if (arguments.length === 3) {
-           var min$1 = arguments[0];
-           var max$1 = arguments[1];
-           var visitor$1 = arguments[2];
-           this._index.query(min$1, max$1, visitor$1);
-         }
-       };
-       IntervalIndexedGeometry.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       IntervalIndexedGeometry.prototype.getClass = function getClass () {
-         return IntervalIndexedGeometry
+         this.next = null;
+         this.key = key;
+         this.data = data;
+         this.left = null;
+         this.right = null;
        };
+       /* follows "An implementation of top-down splaying"
+        * by D. Sleator <sleator@cs.cmu.edu> March 1992
+        */
 
-       var GeometryGraph = (function (PlanarGraph$$1) {
-         function GeometryGraph () {
-           PlanarGraph$$1.call(this);
-           this._parentGeom = null;
-           this._lineEdgeMap = new HashMap();
-           this._boundaryNodeRule = null;
-           this._useBoundaryDeterminationRule = true;
-           this._argIndex = null;
-           this._boundaryNodes = null;
-           this._hasTooFewPoints = false;
-           this._invalidPoint = null;
-           this._areaPtLocator = null;
-           this._ptLocator = new PointLocator();
-           if (arguments.length === 2) {
-             var argIndex = arguments[0];
-             var parentGeom = arguments[1];
-             var boundaryNodeRule = BoundaryNodeRule.OGC_SFS_BOUNDARY_RULE;
-             this._argIndex = argIndex;
-             this._parentGeom = parentGeom;
-             this._boundaryNodeRule = boundaryNodeRule;
-             if (parentGeom !== null) {
-               this.add(parentGeom);
-             }
-           } else if (arguments.length === 3) {
-             var argIndex$1 = arguments[0];
-             var parentGeom$1 = arguments[1];
-             var boundaryNodeRule$1 = arguments[2];
-             this._argIndex = argIndex$1;
-             this._parentGeom = parentGeom$1;
-             this._boundaryNodeRule = boundaryNodeRule$1;
-             if (parentGeom$1 !== null) {
-               this.add(parentGeom$1);
-             }
-           }
-         }
-
-         if ( PlanarGraph$$1 ) GeometryGraph.__proto__ = PlanarGraph$$1;
-         GeometryGraph.prototype = Object.create( PlanarGraph$$1 && PlanarGraph$$1.prototype );
-         GeometryGraph.prototype.constructor = GeometryGraph;
-         GeometryGraph.prototype.insertBoundaryPoint = function insertBoundaryPoint (argIndex, coord) {
-           var n = this._nodes.addNode(coord);
-           var lbl = n.getLabel();
-           var boundaryCount = 1;
-           var loc = Location.NONE;
-           loc = lbl.getLocation(argIndex, Position.ON);
-           if (loc === Location.BOUNDARY) { boundaryCount++; }
-           var newLoc = GeometryGraph.determineBoundary(this._boundaryNodeRule, boundaryCount);
-           lbl.setLocation(argIndex, newLoc);
-         };
-         GeometryGraph.prototype.computeSelfNodes = function computeSelfNodes () {
-           if (arguments.length === 2) {
-             var li = arguments[0];
-             var computeRingSelfNodes = arguments[1];
-             return this.computeSelfNodes(li, computeRingSelfNodes, false)
-           } else if (arguments.length === 3) {
-             var li$1 = arguments[0];
-             var computeRingSelfNodes$1 = arguments[1];
-             var isDoneIfProperInt = arguments[2];
-             var si = new SegmentIntersector$2(li$1, true, false);
-             si.setIsDoneIfProperInt(isDoneIfProperInt);
-             var esi = this.createEdgeSetIntersector();
-             var isRings = this._parentGeom instanceof LinearRing || this._parentGeom instanceof Polygon || this._parentGeom instanceof MultiPolygon;
-             var computeAllSegments = computeRingSelfNodes$1 || !isRings;
-             esi.computeIntersections(this._edges, si, computeAllSegments);
-             this.addSelfIntersectionNodes(this._argIndex);
-             return si
-           }
-         };
-         GeometryGraph.prototype.computeSplitEdges = function computeSplitEdges (edgelist) {
-           for (var i = this._edges.iterator(); i.hasNext();) {
-             var e = i.next();
-             e.eiList.addSplitEdges(edgelist);
-           }
-         };
-         GeometryGraph.prototype.computeEdgeIntersections = function computeEdgeIntersections (g, li, includeProper) {
-           var si = new SegmentIntersector$2(li, includeProper, true);
-           si.setBoundaryNodes(this.getBoundaryNodes(), g.getBoundaryNodes());
-           var esi = this.createEdgeSetIntersector();
-           esi.computeIntersections(this._edges, g._edges, si);
-           return si
-         };
-         GeometryGraph.prototype.getGeometry = function getGeometry () {
-           return this._parentGeom
-         };
-         GeometryGraph.prototype.getBoundaryNodeRule = function getBoundaryNodeRule () {
-           return this._boundaryNodeRule
-         };
-         GeometryGraph.prototype.hasTooFewPoints = function hasTooFewPoints () {
-           return this._hasTooFewPoints
-         };
-         GeometryGraph.prototype.addPoint = function addPoint () {
-           if (arguments[0] instanceof Point$1) {
-             var p = arguments[0];
-             var coord = p.getCoordinate();
-             this.insertPoint(this._argIndex, coord, Location.INTERIOR);
-           } else if (arguments[0] instanceof Coordinate) {
-             var pt = arguments[0];
-             this.insertPoint(this._argIndex, pt, Location.INTERIOR);
-           }
-         };
-         GeometryGraph.prototype.addPolygon = function addPolygon (p) {
-           var this$1 = this;
-
-           this.addPolygonRing(p.getExteriorRing(), Location.EXTERIOR, Location.INTERIOR);
-           for (var i = 0; i < p.getNumInteriorRing(); i++) {
-             var hole = p.getInteriorRingN(i);
-             this$1.addPolygonRing(hole, Location.INTERIOR, Location.EXTERIOR);
-           }
-         };
-         GeometryGraph.prototype.addEdge = function addEdge (e) {
-           this.insertEdge(e);
-           var coord = e.getCoordinates();
-           this.insertPoint(this._argIndex, coord[0], Location.BOUNDARY);
-           this.insertPoint(this._argIndex, coord[coord.length - 1], Location.BOUNDARY);
-         };
-         GeometryGraph.prototype.addLineString = function addLineString (line) {
-           var coord = CoordinateArrays.removeRepeatedPoints(line.getCoordinates());
-           if (coord.length < 2) {
-             this._hasTooFewPoints = true;
-             this._invalidPoint = coord[0];
-             return null
-           }
-           var e = new Edge(coord, new Label(this._argIndex, Location.INTERIOR));
-           this._lineEdgeMap.put(line, e);
-           this.insertEdge(e);
-           Assert.isTrue(coord.length >= 2, 'found LineString with single point');
-           this.insertBoundaryPoint(this._argIndex, coord[0]);
-           this.insertBoundaryPoint(this._argIndex, coord[coord.length - 1]);
-         };
-         GeometryGraph.prototype.getInvalidPoint = function getInvalidPoint () {
-           return this._invalidPoint
-         };
-         GeometryGraph.prototype.getBoundaryPoints = function getBoundaryPoints () {
-           var coll = this.getBoundaryNodes();
-           var pts = new Array(coll.size()).fill(null);
-           var i = 0;
-           for (var it = coll.iterator(); it.hasNext();) {
-             var node = it.next();
-             pts[i++] = node.getCoordinate().copy();
-           }
-           return pts
-         };
-         GeometryGraph.prototype.getBoundaryNodes = function getBoundaryNodes () {
-           if (this._boundaryNodes === null) { this._boundaryNodes = this._nodes.getBoundaryNodes(this._argIndex); }
-           return this._boundaryNodes
-         };
-         GeometryGraph.prototype.addSelfIntersectionNode = function addSelfIntersectionNode (argIndex, coord, loc) {
-           if (this.isBoundaryNode(argIndex, coord)) { return null }
-           if (loc === Location.BOUNDARY && this._useBoundaryDeterminationRule) { this.insertBoundaryPoint(argIndex, coord); } else { this.insertPoint(argIndex, coord, loc); }
-         };
-         GeometryGraph.prototype.addPolygonRing = function addPolygonRing (lr, cwLeft, cwRight) {
-           if (lr.isEmpty()) { return null }
-           var coord = CoordinateArrays.removeRepeatedPoints(lr.getCoordinates());
-           if (coord.length < 4) {
-             this._hasTooFewPoints = true;
-             this._invalidPoint = coord[0];
-             return null
-           }
-           var left = cwLeft;
-           var right = cwRight;
-           if (CGAlgorithms.isCCW(coord)) {
-             left = cwRight;
-             right = cwLeft;
-           }
-           var e = new Edge(coord, new Label(this._argIndex, Location.BOUNDARY, left, right));
-           this._lineEdgeMap.put(lr, e);
-           this.insertEdge(e);
-           this.insertPoint(this._argIndex, coord[0], Location.BOUNDARY);
-         };
-         GeometryGraph.prototype.insertPoint = function insertPoint (argIndex, coord, onLocation) {
-           var n = this._nodes.addNode(coord);
-           var lbl = n.getLabel();
-           if (lbl === null) {
-             n._label = new Label(argIndex, onLocation);
-           } else { lbl.setLocation(argIndex, onLocation); }
-         };
-         GeometryGraph.prototype.createEdgeSetIntersector = function createEdgeSetIntersector () {
-           return new SimpleMCSweepLineIntersector()
-         };
-         GeometryGraph.prototype.addSelfIntersectionNodes = function addSelfIntersectionNodes (argIndex) {
-           var this$1 = this;
-
-           for (var i = this._edges.iterator(); i.hasNext();) {
-             var e = i.next();
-             var eLoc = e.getLabel().getLocation(argIndex);
-             for (var eiIt = e.eiList.iterator(); eiIt.hasNext();) {
-               var ei = eiIt.next();
-               this$1.addSelfIntersectionNode(argIndex, ei.coord, eLoc);
-             }
-           }
-         };
-         GeometryGraph.prototype.add = function add () {
-           if (arguments.length === 1) {
-             var g = arguments[0];
-             if (g.isEmpty()) { return null }
-             if (g instanceof MultiPolygon) { this._useBoundaryDeterminationRule = false; }
-             if (g instanceof Polygon) { this.addPolygon(g); }
-             else if (g instanceof LineString) { this.addLineString(g); }
-             else if (g instanceof Point$1) { this.addPoint(g); }
-             else if (g instanceof MultiPoint) { this.addCollection(g); }
-             else if (g instanceof MultiLineString) { this.addCollection(g); }
-             else if (g instanceof MultiPolygon) { this.addCollection(g); }
-             else if (g instanceof GeometryCollection) { this.addCollection(g); }
-             else { throw new Error(g.getClass().getName()) }
-           } else { return PlanarGraph$$1.prototype.add.apply(this, arguments) }
-         };
-         GeometryGraph.prototype.addCollection = function addCollection (gc) {
-           var this$1 = this;
-
-           for (var i = 0; i < gc.getNumGeometries(); i++) {
-             var g = gc.getGeometryN(i);
-             this$1.add(g);
-           }
-         };
-         GeometryGraph.prototype.locate = function locate (pt) {
-           if (hasInterface(this._parentGeom, Polygonal) && this._parentGeom.getNumGeometries() > 50) {
-             if (this._areaPtLocator === null) {
-               this._areaPtLocator = new IndexedPointInAreaLocator(this._parentGeom);
-             }
-             return this._areaPtLocator.locate(pt)
-           }
-           return this._ptLocator.locate(pt, this._parentGeom)
-         };
-         GeometryGraph.prototype.findEdge = function findEdge () {
-           if (arguments.length === 1) {
-             var line = arguments[0];
-             return this._lineEdgeMap.get(line)
-           } else { return PlanarGraph$$1.prototype.findEdge.apply(this, arguments) }
-         };
-         GeometryGraph.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         GeometryGraph.prototype.getClass = function getClass () {
-           return GeometryGraph
-         };
-         GeometryGraph.determineBoundary = function determineBoundary (boundaryNodeRule, boundaryCount) {
-           return boundaryNodeRule.isInBoundary(boundaryCount) ? Location.BOUNDARY : Location.INTERIOR
-         };
-
-         return GeometryGraph;
-       }(PlanarGraph));
-
-       var GeometryGraphOp = function GeometryGraphOp () {
-         this._li = new RobustLineIntersector();
-         this._resultPrecisionModel = null;
-         this._arg = null;
-         if (arguments.length === 1) {
-           var g0 = arguments[0];
-           this.setComputationPrecision(g0.getPrecisionModel());
-           this._arg = new Array(1).fill(null);
-           this._arg[0] = new GeometryGraph(0, g0);
-         } else if (arguments.length === 2) {
-           var g0$1 = arguments[0];
-           var g1 = arguments[1];
-           var boundaryNodeRule = BoundaryNodeRule.OGC_SFS_BOUNDARY_RULE;
-           if (g0$1.getPrecisionModel().compareTo(g1.getPrecisionModel()) >= 0) { this.setComputationPrecision(g0$1.getPrecisionModel()); } else { this.setComputationPrecision(g1.getPrecisionModel()); }
-           this._arg = new Array(2).fill(null);
-           this._arg[0] = new GeometryGraph(0, g0$1, boundaryNodeRule);
-           this._arg[1] = new GeometryGraph(1, g1, boundaryNodeRule);
-         } else if (arguments.length === 3) {
-           var g0$2 = arguments[0];
-           var g1$1 = arguments[1];
-           var boundaryNodeRule$1 = arguments[2];
-           if (g0$2.getPrecisionModel().compareTo(g1$1.getPrecisionModel()) >= 0) { this.setComputationPrecision(g0$2.getPrecisionModel()); } else { this.setComputationPrecision(g1$1.getPrecisionModel()); }
-           this._arg = new Array(2).fill(null);
-           this._arg[0] = new GeometryGraph(0, g0$2, boundaryNodeRule$1);
-           this._arg[1] = new GeometryGraph(1, g1$1, boundaryNodeRule$1);
-         }
-       };
-       GeometryGraphOp.prototype.getArgGeometry = function getArgGeometry (i) {
-         return this._arg[i].getGeometry()
-       };
-       GeometryGraphOp.prototype.setComputationPrecision = function setComputationPrecision (pm) {
-         this._resultPrecisionModel = pm;
-         this._li.setPrecisionModel(this._resultPrecisionModel);
-       };
-       GeometryGraphOp.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       GeometryGraphOp.prototype.getClass = function getClass () {
-         return GeometryGraphOp
-       };
 
-       // operation.geometrygraph
+       function DEFAULT_COMPARE$1(a, b) {
+         return a > b ? 1 : a < b ? -1 : 0;
+       }
+       /**
+        * Simple top down splay, not requiring i to be in the tree t.
+        */
 
-       var GeometryMapper = function GeometryMapper () {};
 
-       GeometryMapper.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       GeometryMapper.prototype.getClass = function getClass () {
-         return GeometryMapper
-       };
-       GeometryMapper.map = function map () {
-         if (arguments[0] instanceof Geometry && hasInterface(arguments[1], GeometryMapper.MapOp)) {
-           var geom = arguments[0];
-           var op = arguments[1];
-           var mapped = new ArrayList();
-           for (var i = 0; i < geom.getNumGeometries(); i++) {
-             var g = op.map(geom.getGeometryN(i));
-             if (g !== null) { mapped.add(g); }
-           }
-           return geom.getFactory().buildGeometry(mapped)
-         } else if (hasInterface(arguments[0], Collection) && hasInterface(arguments[1], GeometryMapper.MapOp)) {
-           var geoms = arguments[0];
-           var op$1 = arguments[1];
-           var mapped$1 = new ArrayList();
-           for (var i$1 = geoms.iterator(); i$1.hasNext();) {
-             var g$1 = i$1.next();
-             var gr = op$1.map(g$1);
-             if (gr !== null) { mapped$1.add(gr); }
-           }
-           return mapped$1
-         }
-       };
-       GeometryMapper.MapOp = function MapOp () {};
-
-       var OverlayOp = (function (GeometryGraphOp) {
-         function OverlayOp () {
-           var g0 = arguments[0];
-           var g1 = arguments[1];
-           GeometryGraphOp.call(this, g0, g1);
-           this._ptLocator = new PointLocator();
-           this._geomFact = null;
-           this._resultGeom = null;
-           this._graph = null;
-           this._edgeList = new EdgeList();
-           this._resultPolyList = new ArrayList();
-           this._resultLineList = new ArrayList();
-           this._resultPointList = new ArrayList();
-           this._graph = new PlanarGraph(new OverlayNodeFactory());
-           this._geomFact = g0.getFactory();
-         }
-
-         if ( GeometryGraphOp ) OverlayOp.__proto__ = GeometryGraphOp;
-         OverlayOp.prototype = Object.create( GeometryGraphOp && GeometryGraphOp.prototype );
-         OverlayOp.prototype.constructor = OverlayOp;
-         OverlayOp.prototype.insertUniqueEdge = function insertUniqueEdge (e) {
-           var existingEdge = this._edgeList.findEqualEdge(e);
-           if (existingEdge !== null) {
-             var existingLabel = existingEdge.getLabel();
-             var labelToMerge = e.getLabel();
-             if (!existingEdge.isPointwiseEqual(e)) {
-               labelToMerge = new Label(e.getLabel());
-               labelToMerge.flip();
-             }
-             var depth = existingEdge.getDepth();
-             if (depth.isNull()) {
-               depth.add(existingLabel);
-             }
-             depth.add(labelToMerge);
-             existingLabel.merge(labelToMerge);
-           } else {
-             this._edgeList.add(e);
-           }
-         };
-         OverlayOp.prototype.getGraph = function getGraph () {
-           return this._graph
-         };
-         OverlayOp.prototype.cancelDuplicateResultEdges = function cancelDuplicateResultEdges () {
-           for (var it = this._graph.getEdgeEnds().iterator(); it.hasNext();) {
-             var de = it.next();
-             var sym = de.getSym();
-             if (de.isInResult() && sym.isInResult()) {
-               de.setInResult(false);
-               sym.setInResult(false);
-             }
-           }
-         };
-         OverlayOp.prototype.isCoveredByLA = function isCoveredByLA (coord) {
-           if (this.isCovered(coord, this._resultLineList)) { return true }
-           if (this.isCovered(coord, this._resultPolyList)) { return true }
-           return false
-         };
-         OverlayOp.prototype.computeGeometry = function computeGeometry (resultPointList, resultLineList, resultPolyList, opcode) {
-           var geomList = new ArrayList();
-           geomList.addAll(resultPointList);
-           geomList.addAll(resultLineList);
-           geomList.addAll(resultPolyList);
-           if (geomList.isEmpty()) { return OverlayOp.createEmptyResult(opcode, this._arg[0].getGeometry(), this._arg[1].getGeometry(), this._geomFact) }
-           return this._geomFact.buildGeometry(geomList)
-         };
-         OverlayOp.prototype.mergeSymLabels = function mergeSymLabels () {
-           for (var nodeit = this._graph.getNodes().iterator(); nodeit.hasNext();) {
-             var node = nodeit.next();
-             node.getEdges().mergeSymLabels();
-           }
-         };
-         OverlayOp.prototype.isCovered = function isCovered (coord, geomList) {
-           var this$1 = this;
-
-           for (var it = geomList.iterator(); it.hasNext();) {
-             var geom = it.next();
-             var loc = this$1._ptLocator.locate(coord, geom);
-             if (loc !== Location.EXTERIOR) { return true }
-           }
-           return false
-         };
-         OverlayOp.prototype.replaceCollapsedEdges = function replaceCollapsedEdges () {
-           var newEdges = new ArrayList();
-           for (var it = this._edgeList.iterator(); it.hasNext();) {
-             var e = it.next();
-             if (e.isCollapsed()) {
-               it.remove();
-               newEdges.add(e.getCollapsedEdge());
-             }
-           }
-           this._edgeList.addAll(newEdges);
-         };
-         OverlayOp.prototype.updateNodeLabelling = function updateNodeLabelling () {
-           for (var nodeit = this._graph.getNodes().iterator(); nodeit.hasNext();) {
-             var node = nodeit.next();
-             var lbl = node.getEdges().getLabel();
-             node.getLabel().merge(lbl);
-           }
-         };
-         OverlayOp.prototype.getResultGeometry = function getResultGeometry (overlayOpCode) {
-           this.computeOverlay(overlayOpCode);
-           return this._resultGeom
-         };
-         OverlayOp.prototype.insertUniqueEdges = function insertUniqueEdges (edges) {
-           var this$1 = this;
-
-           for (var i = edges.iterator(); i.hasNext();) {
-             var e = i.next();
-             this$1.insertUniqueEdge(e);
-           }
-         };
-         OverlayOp.prototype.computeOverlay = function computeOverlay (opCode) {
-           this.copyPoints(0);
-           this.copyPoints(1);
-           this._arg[0].computeSelfNodes(this._li, false);
-           this._arg[1].computeSelfNodes(this._li, false);
-           this._arg[0].computeEdgeIntersections(this._arg[1], this._li, true);
-           var baseSplitEdges = new ArrayList();
-           this._arg[0].computeSplitEdges(baseSplitEdges);
-           this._arg[1].computeSplitEdges(baseSplitEdges);
-           // const splitEdges = baseSplitEdges
-           this.insertUniqueEdges(baseSplitEdges);
-           this.computeLabelsFromDepths();
-           this.replaceCollapsedEdges();
-           EdgeNodingValidator.checkValid(this._edgeList.getEdges());
-           this._graph.addEdges(this._edgeList.getEdges());
-           this.computeLabelling();
-           this.labelIncompleteNodes();
-           this.findResultAreaEdges(opCode);
-           this.cancelDuplicateResultEdges();
-           var polyBuilder = new PolygonBuilder(this._geomFact);
-           polyBuilder.add(this._graph);
-           this._resultPolyList = polyBuilder.getPolygons();
-           var lineBuilder = new LineBuilder(this, this._geomFact, this._ptLocator);
-           this._resultLineList = lineBuilder.build(opCode);
-           var pointBuilder = new PointBuilder(this, this._geomFact, this._ptLocator);
-           this._resultPointList = pointBuilder.build(opCode);
-           this._resultGeom = this.computeGeometry(this._resultPointList, this._resultLineList, this._resultPolyList, opCode);
-         };
-         OverlayOp.prototype.labelIncompleteNode = function labelIncompleteNode (n, targetIndex) {
-           var loc = this._ptLocator.locate(n.getCoordinate(), this._arg[targetIndex].getGeometry());
-           n.getLabel().setLocation(targetIndex, loc);
-         };
-         OverlayOp.prototype.copyPoints = function copyPoints (argIndex) {
-           var this$1 = this;
-
-           for (var i = this._arg[argIndex].getNodeIterator(); i.hasNext();) {
-             var graphNode = i.next();
-             var newNode = this$1._graph.addNode(graphNode.getCoordinate());
-             newNode.setLabel(argIndex, graphNode.getLabel().getLocation(argIndex));
-           }
-         };
-         OverlayOp.prototype.findResultAreaEdges = function findResultAreaEdges (opCode) {
-           for (var it = this._graph.getEdgeEnds().iterator(); it.hasNext();) {
-             var de = it.next();
-             var label = de.getLabel();
-             if (label.isArea() && !de.isInteriorAreaEdge() && OverlayOp.isResultOfOp(label.getLocation(0, Position.RIGHT), label.getLocation(1, Position.RIGHT), opCode)) {
-               de.setInResult(true);
-             }
-           }
-         };
-         OverlayOp.prototype.computeLabelsFromDepths = function computeLabelsFromDepths () {
-           for (var it = this._edgeList.iterator(); it.hasNext();) {
-             var e = it.next();
-             var lbl = e.getLabel();
-             var depth = e.getDepth();
-             if (!depth.isNull()) {
-               depth.normalize();
-               for (var i = 0; i < 2; i++) {
-                 if (!lbl.isNull(i) && lbl.isArea() && !depth.isNull(i)) {
-                   if (depth.getDelta(i) === 0) {
-                     lbl.toLine(i);
-                   } else {
-                     Assert.isTrue(!depth.isNull(i, Position.LEFT), 'depth of LEFT side has not been initialized');
-                     lbl.setLocation(i, Position.LEFT, depth.getLocation(i, Position.LEFT));
-                     Assert.isTrue(!depth.isNull(i, Position.RIGHT), 'depth of RIGHT side has not been initialized');
-                     lbl.setLocation(i, Position.RIGHT, depth.getLocation(i, Position.RIGHT));
-                   }
-                 }
-               }
-             }
-           }
-         };
-         OverlayOp.prototype.computeLabelling = function computeLabelling () {
-           var this$1 = this;
+       function splay(i, t, comparator) {
+         var N = new Node$1(null, null);
+         var l = N;
+         var r = N;
 
-           for (var nodeit = this._graph.getNodes().iterator(); nodeit.hasNext();) {
-             var node = nodeit.next();
-             node.getEdges().computeLabelling(this$1._arg);
-           }
-           this.mergeSymLabels();
-           this.updateNodeLabelling();
-         };
-         OverlayOp.prototype.labelIncompleteNodes = function labelIncompleteNodes () {
-           var this$1 = this;
+         while (true) {
+           var cmp = comparator(i, t.key); //if (i < t.key) {
 
-           // let nodeCount = 0
-           for (var ni = this._graph.getNodes().iterator(); ni.hasNext();) {
-             var n = ni.next();
-             var label = n.getLabel();
-             if (n.isIsolated()) {
-               // nodeCount++
-               if (label.isNull(0)) { this$1.labelIncompleteNode(n, 0); } else { this$1.labelIncompleteNode(n, 1); }
-             }
-             n.getEdges().updateLabelling(label);
-           }
-         };
-         OverlayOp.prototype.isCoveredByA = function isCoveredByA (coord) {
-           if (this.isCovered(coord, this._resultPolyList)) { return true }
-           return false
-         };
-         OverlayOp.prototype.interfaces_ = function interfaces_ () {
-           return []
-         };
-         OverlayOp.prototype.getClass = function getClass () {
-           return OverlayOp
-         };
+           if (cmp < 0) {
+             if (t.left === null) break; //if (i < t.left.key) {
 
-         return OverlayOp;
-       }(GeometryGraphOp));
+             if (comparator(i, t.left.key) < 0) {
+               var y = t.left;
+               /* rotate right */
 
-       OverlayOp.overlayOp = function (geom0, geom1, opCode) {
-         var gov = new OverlayOp(geom0, geom1);
-         var geomOv = gov.getResultGeometry(opCode);
-         return geomOv
-       };
-       OverlayOp.intersection = function (g, other) {
-         if (g.isEmpty() || other.isEmpty()) { return OverlayOp.createEmptyResult(OverlayOp.INTERSECTION, g, other, g.getFactory()) }
-         if (g.isGeometryCollection()) {
-           var g2 = other;
-           return GeometryCollectionMapper.map(g, {
-             interfaces_: function () {
-               return [GeometryMapper.MapOp]
-             },
-             map: function (g) {
-               return g.intersection(g2)
+               t.left = y.right;
+               y.right = t;
+               t = y;
+               if (t.left === null) break;
              }
-           })
-         }
-         g.checkNotGeometryCollection(g);
-         g.checkNotGeometryCollection(other);
-         return SnapIfNeededOverlayOp.overlayOp(g, other, OverlayOp.INTERSECTION)
-       };
-       OverlayOp.symDifference = function (g, other) {
-         if (g.isEmpty() || other.isEmpty()) {
-           if (g.isEmpty() && other.isEmpty()) { return OverlayOp.createEmptyResult(OverlayOp.SYMDIFFERENCE, g, other, g.getFactory()) }
-           if (g.isEmpty()) { return other.copy() }
-           if (other.isEmpty()) { return g.copy() }
-         }
-         g.checkNotGeometryCollection(g);
-         g.checkNotGeometryCollection(other);
-         return SnapIfNeededOverlayOp.overlayOp(g, other, OverlayOp.SYMDIFFERENCE)
-       };
-       OverlayOp.resultDimension = function (opCode, g0, g1) {
-         var dim0 = g0.getDimension();
-         var dim1 = g1.getDimension();
-         var resultDimension = -1;
-         switch (opCode) {
-           case OverlayOp.INTERSECTION:
-             resultDimension = Math.min(dim0, dim1);
-             break
-           case OverlayOp.UNION:
-             resultDimension = Math.max(dim0, dim1);
-             break
-           case OverlayOp.DIFFERENCE:
-             resultDimension = dim0;
-             break
-           case OverlayOp.SYMDIFFERENCE:
-             resultDimension = Math.max(dim0, dim1);
-             break
-         }
-         return resultDimension
-       };
-       OverlayOp.createEmptyResult = function (overlayOpCode, a, b, geomFact) {
-         var result = null;
-         switch (OverlayOp.resultDimension(overlayOpCode, a, b)) {
-           case -1:
-             result = geomFact.createGeometryCollection(new Array(0).fill(null));
-             break
-           case 0:
-             result = geomFact.createPoint();
-             break
-           case 1:
-             result = geomFact.createLineString();
-             break
-           case 2:
-             result = geomFact.createPolygon();
-             break
-         }
-         return result
-       };
-       OverlayOp.difference = function (g, other) {
-         if (g.isEmpty()) { return OverlayOp.createEmptyResult(OverlayOp.DIFFERENCE, g, other, g.getFactory()) }
-         if (other.isEmpty()) { return g.copy() }
-         g.checkNotGeometryCollection(g);
-         g.checkNotGeometryCollection(other);
-         return SnapIfNeededOverlayOp.overlayOp(g, other, OverlayOp.DIFFERENCE)
-       };
-       OverlayOp.isResultOfOp = function () {
-         if (arguments.length === 2) {
-           var label = arguments[0];
-           var opCode = arguments[1];
-           var loc0 = label.getLocation(0);
-           var loc1 = label.getLocation(1);
-           return OverlayOp.isResultOfOp(loc0, loc1, opCode)
-         } else if (arguments.length === 3) {
-           var loc0$1 = arguments[0];
-           var loc1$1 = arguments[1];
-           var overlayOpCode = arguments[2];
-           if (loc0$1 === Location.BOUNDARY) { loc0$1 = Location.INTERIOR; }
-           if (loc1$1 === Location.BOUNDARY) { loc1$1 = Location.INTERIOR; }
-           switch (overlayOpCode) {
-             case OverlayOp.INTERSECTION:
-               return loc0$1 === Location.INTERIOR && loc1$1 === Location.INTERIOR
-             case OverlayOp.UNION:
-               return loc0$1 === Location.INTERIOR || loc1$1 === Location.INTERIOR
-             case OverlayOp.DIFFERENCE:
-               return loc0$1 === Location.INTERIOR && loc1$1 !== Location.INTERIOR
-             case OverlayOp.SYMDIFFERENCE:
-               return (loc0$1 === Location.INTERIOR && loc1$1 !== Location.INTERIOR) || (loc0$1 !== Location.INTERIOR && loc1$1 === Location.INTERIOR)
-           }
-           return false
-         }
-       };
-       OverlayOp.INTERSECTION = 1;
-       OverlayOp.UNION = 2;
-       OverlayOp.DIFFERENCE = 3;
-       OverlayOp.SYMDIFFERENCE = 4;
-
-       var FuzzyPointLocator = function FuzzyPointLocator () {
-         this._g = null;
-         this._boundaryDistanceTolerance = null;
-         this._linework = null;
-         this._ptLocator = new PointLocator();
-         this._seg = new LineSegment();
-         var g = arguments[0];
-         var boundaryDistanceTolerance = arguments[1];
-         this._g = g;
-         this._boundaryDistanceTolerance = boundaryDistanceTolerance;
-         this._linework = this.extractLinework(g);
-       };
-       FuzzyPointLocator.prototype.isWithinToleranceOfBoundary = function isWithinToleranceOfBoundary (pt) {
-           var this$1 = this;
 
-         for (var i = 0; i < this._linework.getNumGeometries(); i++) {
-           var line = this$1._linework.getGeometryN(i);
-           var seq = line.getCoordinateSequence();
-           for (var j = 0; j < seq.size() - 1; j++) {
-             seq.getCoordinate(j, this$1._seg.p0);
-             seq.getCoordinate(j + 1, this$1._seg.p1);
-             var dist = this$1._seg.distance(pt);
-             if (dist <= this$1._boundaryDistanceTolerance) { return true }
-           }
-         }
-         return false
-       };
-       FuzzyPointLocator.prototype.getLocation = function getLocation (pt) {
-         if (this.isWithinToleranceOfBoundary(pt)) { return Location.BOUNDARY }
-         return this._ptLocator.locate(pt, this._g)
-       };
-       FuzzyPointLocator.prototype.extractLinework = function extractLinework (g) {
-         var extracter = new PolygonalLineworkExtracter();
-         g.apply(extracter);
-         var linework = extracter.getLinework();
-         var lines = GeometryFactory.toLineStringArray(linework);
-         return g.getFactory().createMultiLineString(lines)
-       };
-       FuzzyPointLocator.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       FuzzyPointLocator.prototype.getClass = function getClass () {
-         return FuzzyPointLocator
-       };
+             r.left = t;
+             /* link right */
 
-       var PolygonalLineworkExtracter = function PolygonalLineworkExtracter () {
-         this._linework = null;
-         this._linework = new ArrayList();
-       };
-       PolygonalLineworkExtracter.prototype.getLinework = function getLinework () {
-         return this._linework
-       };
-       PolygonalLineworkExtracter.prototype.filter = function filter (g) {
-           var this$1 = this;
+             r = t;
+             t = t.left; //} else if (i > t.key) {
+           } else if (cmp > 0) {
+             if (t.right === null) break; //if (i > t.right.key) {
 
-         if (g instanceof Polygon) {
-           var poly = g;
-           this._linework.add(poly.getExteriorRing());
-           for (var i = 0; i < poly.getNumInteriorRing(); i++) {
-             this$1._linework.add(poly.getInteriorRingN(i));
-           }
-         }
-       };
-       PolygonalLineworkExtracter.prototype.interfaces_ = function interfaces_ () {
-         return [GeometryFilter]
-       };
-       PolygonalLineworkExtracter.prototype.getClass = function getClass () {
-         return PolygonalLineworkExtracter
-       };
+             if (comparator(i, t.right.key) > 0) {
+               var _y = t.right;
+               /* rotate left */
 
-       var OffsetPointGenerator = function OffsetPointGenerator () {
-         this._g = null;
-         this._doLeft = true;
-         this._doRight = true;
-         var g = arguments[0];
-         this._g = g;
-       };
-       OffsetPointGenerator.prototype.extractPoints = function extractPoints (line, offsetDistance, offsetPts) {
-           var this$1 = this;
+               t.right = _y.left;
+               _y.left = t;
+               t = _y;
+               if (t.right === null) break;
+             }
 
-         var pts = line.getCoordinates();
-         for (var i = 0; i < pts.length - 1; i++) {
-           this$1.computeOffsetPoints(pts[i], pts[i + 1], offsetDistance, offsetPts);
-         }
-       };
-       OffsetPointGenerator.prototype.setSidesToGenerate = function setSidesToGenerate (doLeft, doRight) {
-         this._doLeft = doLeft;
-         this._doRight = doRight;
-       };
-       OffsetPointGenerator.prototype.getPoints = function getPoints (offsetDistance) {
-           var this$1 = this;
+             l.right = t;
+             /* link left */
 
-         var offsetPts = new ArrayList();
-         var lines = LinearComponentExtracter.getLines(this._g);
-         for (var i = lines.iterator(); i.hasNext();) {
-           var line = i.next();
-           this$1.extractPoints(line, offsetDistance, offsetPts);
-         }
-         return offsetPts
-       };
-       OffsetPointGenerator.prototype.computeOffsetPoints = function computeOffsetPoints (p0, p1, offsetDistance, offsetPts) {
-         var dx = p1.x - p0.x;
-         var dy = p1.y - p0.y;
-         var len = Math.sqrt(dx * dx + dy * dy);
-         var ux = offsetDistance * dx / len;
-         var uy = offsetDistance * dy / len;
-         var midX = (p1.x + p0.x) / 2;
-         var midY = (p1.y + p0.y) / 2;
-         if (this._doLeft) {
-           var offsetLeft = new Coordinate(midX - uy, midY + ux);
-           offsetPts.add(offsetLeft);
-         }
-         if (this._doRight) {
-           var offsetRight = new Coordinate(midX + uy, midY - ux);
-           offsetPts.add(offsetRight);
+             l = t;
+             t = t.right;
+           } else break;
          }
-       };
-       OffsetPointGenerator.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       OffsetPointGenerator.prototype.getClass = function getClass () {
-         return OffsetPointGenerator
-       };
-
-       var OverlayResultValidator = function OverlayResultValidator () {
-         this._geom = null;
-         this._locFinder = null;
-         this._location = new Array(3).fill(null);
-         this._invalidLocation = null;
-         this._boundaryDistanceTolerance = OverlayResultValidator.TOLERANCE;
-         this._testCoords = new ArrayList();
-         var a = arguments[0];
-         var b = arguments[1];
-         var result = arguments[2];
-         this._boundaryDistanceTolerance = OverlayResultValidator.computeBoundaryDistanceTolerance(a, b);
-         this._geom = [a, b, result];
-         this._locFinder = [new FuzzyPointLocator(this._geom[0], this._boundaryDistanceTolerance), new FuzzyPointLocator(this._geom[1], this._boundaryDistanceTolerance), new FuzzyPointLocator(this._geom[2], this._boundaryDistanceTolerance)];
-       };
+         /* assemble */
 
-       var staticAccessors$46 = { TOLERANCE: { configurable: true } };
-       OverlayResultValidator.prototype.reportResult = function reportResult (overlayOp, location, expectedInterior) {
-         System.out.println('Overlay result invalid - A:' + Location.toLocationSymbol(location[0]) + ' B:' + Location.toLocationSymbol(location[1]) + ' expected:' + (expectedInterior ? 'i' : 'e') + ' actual:' + Location.toLocationSymbol(location[2]));
-       };
-       OverlayResultValidator.prototype.isValid = function isValid (overlayOp) {
-         this.addTestPts(this._geom[0]);
-         this.addTestPts(this._geom[1]);
-         var isValid = this.checkValid(overlayOp);
-         return isValid
-       };
-       OverlayResultValidator.prototype.checkValid = function checkValid () {
-           var this$1 = this;
 
-         if (arguments.length === 1) {
-           var overlayOp = arguments[0];
-           for (var i = 0; i < this._testCoords.size(); i++) {
-             var pt = this$1._testCoords.get(i);
-             if (!this$1.checkValid(overlayOp, pt)) {
-               this$1._invalidLocation = pt;
-               return false
-             }
-           }
-           return true
-         } else if (arguments.length === 2) {
-           var overlayOp$1 = arguments[0];
-           var pt$1 = arguments[1];
-           this._location[0] = this._locFinder[0].getLocation(pt$1);
-           this._location[1] = this._locFinder[1].getLocation(pt$1);
-           this._location[2] = this._locFinder[2].getLocation(pt$1);
-           if (OverlayResultValidator.hasLocation(this._location, Location.BOUNDARY)) { return true }
-           return this.isValidResult(overlayOp$1, this._location)
-         }
-       };
-       OverlayResultValidator.prototype.addTestPts = function addTestPts (g) {
-         var ptGen = new OffsetPointGenerator(g);
-         this._testCoords.addAll(ptGen.getPoints(5 * this._boundaryDistanceTolerance));
-       };
-       OverlayResultValidator.prototype.isValidResult = function isValidResult (overlayOp, location) {
-         var expectedInterior = OverlayOp.isResultOfOp(location[0], location[1], overlayOp);
-         var resultInInterior = location[2] === Location.INTERIOR;
-         var isValid = !(expectedInterior ^ resultInInterior);
-         if (!isValid) { this.reportResult(overlayOp, location, expectedInterior); }
-         return isValid
-       };
-       OverlayResultValidator.prototype.getInvalidLocation = function getInvalidLocation () {
-         return this._invalidLocation
-       };
-       OverlayResultValidator.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       OverlayResultValidator.prototype.getClass = function getClass () {
-         return OverlayResultValidator
-       };
-       OverlayResultValidator.hasLocation = function hasLocation (location, loc) {
-         for (var i = 0; i < 3; i++) {
-           if (location[i] === loc) { return true }
-         }
-         return false
-       };
-       OverlayResultValidator.computeBoundaryDistanceTolerance = function computeBoundaryDistanceTolerance (g0, g1) {
-         return Math.min(GeometrySnapper.computeSizeBasedSnapTolerance(g0), GeometrySnapper.computeSizeBasedSnapTolerance(g1))
-       };
-       OverlayResultValidator.isValid = function isValid (a, b, overlayOp, result) {
-         var validator = new OverlayResultValidator(a, b, result);
-         return validator.isValid(overlayOp)
-       };
-       staticAccessors$46.TOLERANCE.get = function () { return 0.000001 };
+         l.right = t.left;
+         r.left = t.right;
+         t.left = N.right;
+         t.right = N.left;
+         return t;
+       }
 
-       Object.defineProperties( OverlayResultValidator, staticAccessors$46 );
+       function _insert(i, data, t, comparator) {
+         var node = new Node$1(i, data);
 
-       // operation.overlay
+         if (t === null) {
+           node.left = node.right = null;
+           return node;
+         }
 
-       var GeometryCombiner = function GeometryCombiner (geoms) {
-         this._geomFactory = null;
-         this._skipEmpty = false;
-         this._inputGeoms = null;
-         this._geomFactory = GeometryCombiner.extractFactory(geoms);
-         this._inputGeoms = geoms;
-       };
-       GeometryCombiner.prototype.extractElements = function extractElements (geom, elems) {
-           var this$1 = this;
+         t = splay(i, t, comparator);
+         var cmp = comparator(i, t.key);
 
-         if (geom === null) { return null }
-         for (var i = 0; i < geom.getNumGeometries(); i++) {
-           var elemGeom = geom.getGeometryN(i);
-           if (this$1._skipEmpty && elemGeom.isEmpty()) { continue }
-           elems.add(elemGeom);
+         if (cmp < 0) {
+           node.left = t.left;
+           node.right = t;
+           t.left = null;
+         } else if (cmp >= 0) {
+           node.right = t.right;
+           node.left = t;
+           t.right = null;
          }
-       };
-       GeometryCombiner.prototype.combine = function combine () {
-           var this$1 = this;
 
-         var elems = new ArrayList();
-         for (var i = this._inputGeoms.iterator(); i.hasNext();) {
-           var g = i.next();
-           this$1.extractElements(g, elems);
-         }
-         if (elems.size() === 0) {
-           if (this._geomFactory !== null) {
-             return this._geomFactory.createGeometryCollection(null)
-           }
-           return null
-         }
-         return this._geomFactory.buildGeometry(elems)
-       };
-       GeometryCombiner.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       GeometryCombiner.prototype.getClass = function getClass () {
-         return GeometryCombiner
-       };
-       GeometryCombiner.combine = function combine () {
-         if (arguments.length === 1) {
-           var geoms = arguments[0];
-           var combiner = new GeometryCombiner(geoms);
-           return combiner.combine()
-         } else if (arguments.length === 2) {
-           var g0 = arguments[0];
-           var g1 = arguments[1];
-           var combiner$1 = new GeometryCombiner(GeometryCombiner.createList(g0, g1));
-           return combiner$1.combine()
-         } else if (arguments.length === 3) {
-           var g0$1 = arguments[0];
-           var g1$1 = arguments[1];
-           var g2 = arguments[2];
-           var combiner$2 = new GeometryCombiner(GeometryCombiner.createList(g0$1, g1$1, g2));
-           return combiner$2.combine()
-         }
-       };
-       GeometryCombiner.extractFactory = function extractFactory (geoms) {
-         if (geoms.isEmpty()) { return null }
-         return geoms.iterator().next().getFactory()
-       };
-       GeometryCombiner.createList = function createList () {
-         if (arguments.length === 2) {
-           var obj0 = arguments[0];
-           var obj1 = arguments[1];
-           var list = new ArrayList();
-           list.add(obj0);
-           list.add(obj1);
-           return list
-         } else if (arguments.length === 3) {
-           var obj0$1 = arguments[0];
-           var obj1$1 = arguments[1];
-           var obj2 = arguments[2];
-           var list$1 = new ArrayList();
-           list$1.add(obj0$1);
-           list$1.add(obj1$1);
-           list$1.add(obj2);
-           return list$1
-         }
-       };
+         return node;
+       }
 
-       var CascadedPolygonUnion = function CascadedPolygonUnion () {
-         this._inputPolys = null;
-         this._geomFactory = null;
-         var polys = arguments[0];
-         this._inputPolys = polys;
-         if (this._inputPolys === null) { this._inputPolys = new ArrayList(); }
-       };
+       function _split(key, v, comparator) {
+         var left = null;
+         var right = null;
 
-       var staticAccessors$47 = { STRTREE_NODE_CAPACITY: { configurable: true } };
-       CascadedPolygonUnion.prototype.reduceToGeometries = function reduceToGeometries (geomTree) {
-           var this$1 = this;
+         if (v) {
+           v = splay(key, v, comparator);
+           var cmp = comparator(v.key, key);
 
-         var geoms = new ArrayList();
-         for (var i = geomTree.iterator(); i.hasNext();) {
-           var o = i.next();
-           var geom = null;
-           if (hasInterface(o, List)) {
-             geom = this$1.unionTree(o);
-           } else if (o instanceof Geometry) {
-             geom = o;
-           }
-           geoms.add(geom);
-         }
-         return geoms
-       };
-       CascadedPolygonUnion.prototype.extractByEnvelope = function extractByEnvelope (env, geom, disjointGeoms) {
-         var intersectingGeoms = new ArrayList();
-         for (var i = 0; i < geom.getNumGeometries(); i++) {
-           var elem = geom.getGeometryN(i);
-           if (elem.getEnvelopeInternal().intersects(env)) { intersectingGeoms.add(elem); } else { disjointGeoms.add(elem); }
-         }
-         return this._geomFactory.buildGeometry(intersectingGeoms)
-       };
-       CascadedPolygonUnion.prototype.unionOptimized = function unionOptimized (g0, g1) {
-         var g0Env = g0.getEnvelopeInternal();
-         var g1Env = g1.getEnvelopeInternal();
-         if (!g0Env.intersects(g1Env)) {
-           var combo = GeometryCombiner.combine(g0, g1);
-           return combo
-         }
-         if (g0.getNumGeometries() <= 1 && g1.getNumGeometries() <= 1) { return this.unionActual(g0, g1) }
-         var commonEnv = g0Env.intersection(g1Env);
-         return this.unionUsingEnvelopeIntersection(g0, g1, commonEnv)
-       };
-       CascadedPolygonUnion.prototype.union = function union () {
-         if (this._inputPolys === null) { throw new Error('union() method cannot be called twice') }
-         if (this._inputPolys.isEmpty()) { return null }
-         this._geomFactory = this._inputPolys.iterator().next().getFactory();
-         var index = new STRtree(CascadedPolygonUnion.STRTREE_NODE_CAPACITY);
-         for (var i = this._inputPolys.iterator(); i.hasNext();) {
-           var item = i.next();
-           index.insert(item.getEnvelopeInternal(), item);
-         }
-         this._inputPolys = null;
-         var itemTree = index.itemsTree();
-         var unionAll = this.unionTree(itemTree);
-         return unionAll
-       };
-       CascadedPolygonUnion.prototype.binaryUnion = function binaryUnion () {
-         if (arguments.length === 1) {
-           var geoms = arguments[0];
-           return this.binaryUnion(geoms, 0, geoms.size())
-         } else if (arguments.length === 3) {
-           var geoms$1 = arguments[0];
-           var start = arguments[1];
-           var end = arguments[2];
-           if (end - start <= 1) {
-             var g0 = CascadedPolygonUnion.getGeometry(geoms$1, start);
-             return this.unionSafe(g0, null)
-           } else if (end - start === 2) {
-             return this.unionSafe(CascadedPolygonUnion.getGeometry(geoms$1, start), CascadedPolygonUnion.getGeometry(geoms$1, start + 1))
+           if (cmp === 0) {
+             left = v.left;
+             right = v.right;
+           } else if (cmp < 0) {
+             right = v.right;
+             v.right = null;
+             left = v;
            } else {
-             var mid = Math.trunc((end + start) / 2);
-             var g0$1 = this.binaryUnion(geoms$1, start, mid);
-             var g1 = this.binaryUnion(geoms$1, mid, end);
-             return this.unionSafe(g0$1, g1)
+             left = v.left;
+             v.left = null;
+             right = v;
            }
          }
-       };
-       CascadedPolygonUnion.prototype.repeatedUnion = function repeatedUnion (geoms) {
-         var union = null;
-         for (var i = geoms.iterator(); i.hasNext();) {
-           var g = i.next();
-           if (union === null) { union = g.copy(); } else { union = union.union(g); }
-         }
-         return union
-       };
-       CascadedPolygonUnion.prototype.unionSafe = function unionSafe (g0, g1) {
-         if (g0 === null && g1 === null) { return null }
-         if (g0 === null) { return g1.copy() }
-         if (g1 === null) { return g0.copy() }
-         return this.unionOptimized(g0, g1)
-       };
-       CascadedPolygonUnion.prototype.unionActual = function unionActual (g0, g1) {
-         return CascadedPolygonUnion.restrictToPolygons(g0.union(g1))
-       };
-       CascadedPolygonUnion.prototype.unionTree = function unionTree (geomTree) {
-         var geoms = this.reduceToGeometries(geomTree);
-         var union = this.binaryUnion(geoms);
-         return union
-       };
-       CascadedPolygonUnion.prototype.unionUsingEnvelopeIntersection = function unionUsingEnvelopeIntersection (g0, g1, common) {
-         var disjointPolys = new ArrayList();
-         var g0Int = this.extractByEnvelope(common, g0, disjointPolys);
-         var g1Int = this.extractByEnvelope(common, g1, disjointPolys);
-         var union = this.unionActual(g0Int, g1Int);
-         disjointPolys.add(union);
-         var overallUnion = GeometryCombiner.combine(disjointPolys);
-         return overallUnion
-       };
-       CascadedPolygonUnion.prototype.bufferUnion = function bufferUnion () {
-         if (arguments.length === 1) {
-           var geoms = arguments[0];
-           var factory = geoms.get(0).getFactory();
-           var gColl = factory.buildGeometry(geoms);
-           var unionAll = gColl.buffer(0.0);
-           return unionAll
-         } else if (arguments.length === 2) {
-           var g0 = arguments[0];
-           var g1 = arguments[1];
-           var factory$1 = g0.getFactory();
-           var gColl$1 = factory$1.createGeometryCollection([g0, g1]);
-           var unionAll$1 = gColl$1.buffer(0.0);
-           return unionAll$1
-         }
-       };
-       CascadedPolygonUnion.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       CascadedPolygonUnion.prototype.getClass = function getClass () {
-         return CascadedPolygonUnion
-       };
-       CascadedPolygonUnion.restrictToPolygons = function restrictToPolygons (g) {
-         if (hasInterface(g, Polygonal)) {
-           return g
-         }
-         var polygons = PolygonExtracter.getPolygons(g);
-         if (polygons.size() === 1) { return polygons.get(0) }
-         return g.getFactory().createMultiPolygon(GeometryFactory.toPolygonArray(polygons))
-       };
-       CascadedPolygonUnion.getGeometry = function getGeometry (list, index) {
-         if (index >= list.size()) { return null }
-         return list.get(index)
-       };
-       CascadedPolygonUnion.union = function union (polys) {
-         var op = new CascadedPolygonUnion(polys);
-         return op.union()
-       };
-       staticAccessors$47.STRTREE_NODE_CAPACITY.get = function () { return 4 };
 
-       Object.defineProperties( CascadedPolygonUnion, staticAccessors$47 );
-
-       var UnionOp = function UnionOp () {};
-
-       UnionOp.prototype.interfaces_ = function interfaces_ () {
-         return []
-       };
-       UnionOp.prototype.getClass = function getClass () {
-         return UnionOp
-       };
-       UnionOp.union = function union (g, other) {
-         if (g.isEmpty() || other.isEmpty()) {
-           if (g.isEmpty() && other.isEmpty()) { return OverlayOp.createEmptyResult(OverlayOp.UNION, g, other, g.getFactory()) }
-           if (g.isEmpty()) { return other.copy() }
-           if (other.isEmpty()) { return g.copy() }
-         }
-         g.checkNotGeometryCollection(g);
-         g.checkNotGeometryCollection(other);
-         return SnapIfNeededOverlayOp.overlayOp(g, other, OverlayOp.UNION)
-       };
+         return {
+           left: left,
+           right: right
+         };
+       }
 
+       function merge$4(left, right, comparator) {
+         if (right === null) return left;
+         if (left === null) return right;
+         right = splay(left.key, right, comparator);
+         right.left = left;
+         return right;
+       }
        /**
-        * Earth Radius used with the Harvesine formula and approximates using a spherical (non-ellipsoid) Earth.
+        * Prints level of the tree
         */
 
-       /**
-        * Wraps a GeoJSON {@link Geometry} in a GeoJSON {@link Feature}.
-        *
-        * @name feature
-        * @param {Geometry} geometry input geometry
-        * @param {Object} [properties={}] an Object of key-value pairs to add as properties
-        * @param {Object} [options={}] Optional Parameters
-        * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature
-        * @param {string|number} [options.id] Identifier associated with the Feature
-        * @returns {Feature} a GeoJSON Feature
-        * @example
-        * var geometry = {
-        *   "type": "Point",
-        *   "coordinates": [110, 50]
-        * };
-        *
-        * var feature = turf.feature(geometry);
-        *
-        * //=feature
-        */
-       function feature$1(geometry, properties, options) {
-           // Optional Parameters
-           options = options || {};
-           if (!isObject$4(options)) throw new Error('options is invalid');
-           var bbox = options.bbox;
-           var id = options.id;
-
-           // Validation
-           if (geometry === undefined) throw new Error('geometry is required');
-           if (properties && properties.constructor !== Object) throw new Error('properties must be an Object');
-           if (bbox) validateBBox(bbox);
-           if (id) validateId(id);
-
-           // Main
-           var feat = {type: 'Feature'};
-           if (id) feat.id = id;
-           if (bbox) feat.bbox = bbox;
-           feat.properties = properties || {};
-           feat.geometry = geometry;
-           return feat;
-       }
 
-       /**
-        * isNumber
-        *
-        * @param {*} num Number to validate
-        * @returns {boolean} true/false
-        * @example
-        * turf.isNumber(123)
-        * //=true
-        * turf.isNumber('foo')
-        * //=false
-        */
-       function isNumber$1(num) {
-           return !isNaN(num) && num !== null && !Array.isArray(num);
+       function printRow(root, prefix, isTail, out, printNode) {
+         if (root) {
+           out("".concat(prefix).concat(isTail ? '└── ' : '├── ').concat(printNode(root), "\n"));
+           var indent = prefix + (isTail ? '    ' : '│   ');
+           if (root.left) printRow(root.left, indent, false, out, printNode);
+           if (root.right) printRow(root.right, indent, true, out, printNode);
+         }
        }
 
-       /**
-        * isObject
-        *
-        * @param {*} input variable to validate
-        * @returns {boolean} true/false
-        * @example
-        * turf.isObject({elevation: 10})
-        * //=true
-        * turf.isObject('foo')
-        * //=false
-        */
-       function isObject$4(input) {
-           return (!!input) && (input.constructor === Object);
-       }
+       var Tree = /*#__PURE__*/function () {
+         function Tree() {
+           var comparator = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : DEFAULT_COMPARE$1;
 
-       /**
-        * Validate BBox
-        *
-        * @private
-        * @param {Array<number>} bbox BBox to validate
-        * @returns {void}
-        * @throws Error if BBox is not valid
-        * @example
-        * validateBBox([-180, -40, 110, 50])
-        * //=OK
-        * validateBBox([-180, -40])
-        * //=Error
-        * validateBBox('Foo')
-        * //=Error
-        * validateBBox(5)
-        * //=Error
-        * validateBBox(null)
-        * //=Error
-        * validateBBox(undefined)
-        * //=Error
-        */
-       function validateBBox(bbox) {
-           if (!bbox) throw new Error('bbox is required');
-           if (!Array.isArray(bbox)) throw new Error('bbox must be an Array');
-           if (bbox.length !== 4 && bbox.length !== 6) throw new Error('bbox must be an Array of 4 or 6 numbers');
-           bbox.forEach(function (num) {
-               if (!isNumber$1(num)) throw new Error('bbox must only contain numbers');
-           });
-       }
+           _classCallCheck(this, Tree);
 
-       /**
-        * Validate Id
-        *
-        * @private
-        * @param {string|number} id Id to validate
-        * @returns {void}
-        * @throws Error if Id is not valid
-        * @example
-        * validateId([-180, -40, 110, 50])
-        * //=Error
-        * validateId([-180, -40])
-        * //=Error
-        * validateId('Foo')
-        * //=OK
-        * validateId(5)
-        * //=OK
-        * validateId(null)
-        * //=Error
-        * validateId(undefined)
-        * //=Error
-        */
-       function validateId(id) {
-           if (!id) throw new Error('id is required');
-           if (['string', 'number'].indexOf(typeof id) === -1) throw new Error('id must be a number or a string');
-       }
+           this._root = null;
+           this._size = 0;
+           this._comparator = comparator;
+         }
+         /**
+          * Inserts a key, allows duplicates
+          */
 
-       /**
-        * Callback for geomEach
-        *
-        * @callback geomEachCallback
-        * @param {Geometry} currentGeometry The current Geometry being processed.
-        * @param {number} featureIndex The current index of the Feature being processed.
-        * @param {Object} featureProperties The current Feature Properties being processed.
-        * @param {Array<number>} featureBBox The current Feature BBox being processed.
-        * @param {number|string} featureId The current Feature Id being processed.
-        */
 
-       /**
-        * Iterate over each geometry in any GeoJSON object, similar to Array.forEach()
-        *
-        * @name geomEach
-        * @param {FeatureCollection|Feature|Geometry} geojson any GeoJSON object
-        * @param {Function} callback a method that takes (currentGeometry, featureIndex, featureProperties, featureBBox, featureId)
-        * @returns {void}
-        * @example
-        * var features = turf.featureCollection([
-        *     turf.point([26, 37], {foo: 'bar'}),
-        *     turf.point([36, 53], {hello: 'world'})
-        * ]);
-        *
-        * turf.geomEach(features, function (currentGeometry, featureIndex, featureProperties, featureBBox, featureId) {
-        *   //=currentGeometry
-        *   //=featureIndex
-        *   //=featureProperties
-        *   //=featureBBox
-        *   //=featureId
-        * });
-        */
-       function geomEach(geojson, callback) {
-           var i, j, g, geometry, stopG,
-               geometryMaybeCollection,
-               isGeometryCollection,
-               featureProperties,
-               featureBBox,
-               featureId,
-               featureIndex = 0,
-               isFeatureCollection = geojson.type === 'FeatureCollection',
-               isFeature = geojson.type === 'Feature',
-               stop = isFeatureCollection ? geojson.features.length : 1;
-
-           // This logic may look a little weird. The reason why it is that way
-           // is because it's trying to be fast. GeoJSON supports multiple kinds
-           // of objects at its root: FeatureCollection, Features, Geometries.
-           // This function has the responsibility of handling all of them, and that
-           // means that some of the `for` loops you see below actually just don't apply
-           // to certain inputs. For instance, if you give this just a
-           // Point geometry, then both loops are short-circuited and all we do
-           // is gradually rename the input until it's called 'geometry'.
-           //
-           // This also aims to allocate as few resources as possible: just a
-           // few numbers and booleans, rather than any temporary arrays as would
-           // be required with the normalization approach.
-           for (i = 0; i < stop; i++) {
-
-               geometryMaybeCollection = (isFeatureCollection ? geojson.features[i].geometry :
-                   (isFeature ? geojson.geometry : geojson));
-               featureProperties = (isFeatureCollection ? geojson.features[i].properties :
-                   (isFeature ? geojson.properties : {}));
-               featureBBox = (isFeatureCollection ? geojson.features[i].bbox :
-                   (isFeature ? geojson.bbox : undefined));
-               featureId = (isFeatureCollection ? geojson.features[i].id :
-                   (isFeature ? geojson.id : undefined));
-               isGeometryCollection = (geometryMaybeCollection) ? geometryMaybeCollection.type === 'GeometryCollection' : false;
-               stopG = isGeometryCollection ? geometryMaybeCollection.geometries.length : 1;
-
-               for (g = 0; g < stopG; g++) {
-                   geometry = isGeometryCollection ?
-                       geometryMaybeCollection.geometries[g] : geometryMaybeCollection;
-
-                   // Handle null Geometry
-                   if (geometry === null) {
-                       if (callback(null, featureIndex, featureProperties, featureBBox, featureId) === false) return false;
-                       continue;
-                   }
-                   switch (geometry.type) {
-                   case 'Point':
-                   case 'LineString':
-                   case 'MultiPoint':
-                   case 'Polygon':
-                   case 'MultiLineString':
-                   case 'MultiPolygon': {
-                       if (callback(geometry, featureIndex, featureProperties, featureBBox, featureId) === false) return false;
-                       break;
-                   }
-                   case 'GeometryCollection': {
-                       for (j = 0; j < geometry.geometries.length; j++) {
-                           if (callback(geometry.geometries[j], featureIndex, featureProperties, featureBBox, featureId) === false) return false;
-                       }
-                       break;
-                   }
-                   default:
-                       throw new Error('Unknown Geometry Type');
-                   }
-               }
-               // Only increase `featureIndex` per each feature
-               featureIndex++;
+         _createClass(Tree, [{
+           key: "insert",
+           value: function insert(key, data) {
+             this._size++;
+             return this._root = _insert(key, data, this._root, this._comparator);
            }
-       }
-
-       /**
-        * Callback for geomReduce
-        *
-        * The first time the callback function is called, the values provided as arguments depend
-        * on whether the reduce method has an initialValue argument.
-        *
-        * If an initialValue is provided to the reduce method:
-        *  - The previousValue argument is initialValue.
-        *  - The currentValue argument is the value of the first element present in the array.
-        *
-        * If an initialValue is not provided:
-        *  - The previousValue argument is the value of the first element present in the array.
-        *  - The currentValue argument is the value of the second element present in the array.
-        *
-        * @callback geomReduceCallback
-        * @param {*} previousValue The accumulated value previously returned in the last invocation
-        * of the callback, or initialValue, if supplied.
-        * @param {Geometry} currentGeometry The current Geometry being processed.
-        * @param {number} featureIndex The current index of the Feature being processed.
-        * @param {Object} featureProperties The current Feature Properties being processed.
-        * @param {Array<number>} featureBBox The current Feature BBox being processed.
-        * @param {number|string} featureId The current Feature Id being processed.
-        */
+           /**
+            * Adds a key, if it is not present in the tree
+            */
 
-       /**
-        * Reduce geometry in any GeoJSON object, similar to Array.reduce().
-        *
-        * @name geomReduce
-        * @param {FeatureCollection|Feature|Geometry} geojson any GeoJSON object
-        * @param {Function} callback a method that takes (previousValue, currentGeometry, featureIndex, featureProperties, featureBBox, featureId)
-        * @param {*} [initialValue] Value to use as the first argument to the first call of the callback.
-        * @returns {*} The value that results from the reduction.
-        * @example
-        * var features = turf.featureCollection([
-        *     turf.point([26, 37], {foo: 'bar'}),
-        *     turf.point([36, 53], {hello: 'world'})
-        * ]);
-        *
-        * turf.geomReduce(features, function (previousValue, currentGeometry, featureIndex, featureProperties, featureBBox, featureId) {
-        *   //=previousValue
-        *   //=currentGeometry
-        *   //=featureIndex
-        *   //=featureProperties
-        *   //=featureBBox
-        *   //=featureId
-        *   return currentGeometry
-        * });
-        */
-       function geomReduce(geojson, callback, initialValue) {
-           var previousValue = initialValue;
-           geomEach(geojson, function (currentGeometry, featureIndex, featureProperties, featureBBox, featureId) {
-               if (featureIndex === 0 && initialValue === undefined) previousValue = currentGeometry;
-               else previousValue = callback(previousValue, currentGeometry, featureIndex, featureProperties, featureBBox, featureId);
-           });
-           return previousValue;
-       }
+         }, {
+           key: "add",
+           value: function add(key, data) {
+             var node = new Node$1(key, data);
 
-       /**
-        * Callback for flattenEach
-        *
-        * @callback flattenEachCallback
-        * @param {Feature} currentFeature The current flattened feature being processed.
-        * @param {number} featureIndex The current index of the Feature being processed.
-        * @param {number} multiFeatureIndex The current index of the Multi-Feature being processed.
-        */
+             if (this._root === null) {
+               node.left = node.right = null;
+               this._size++;
+               this._root = node;
+             }
 
-       /**
-        * Iterate over flattened features in any GeoJSON object, similar to
-        * Array.forEach.
-        *
-        * @name flattenEach
-        * @param {FeatureCollection|Feature|Geometry} geojson any GeoJSON object
-        * @param {Function} callback a method that takes (currentFeature, featureIndex, multiFeatureIndex)
-        * @example
-        * var features = turf.featureCollection([
-        *     turf.point([26, 37], {foo: 'bar'}),
-        *     turf.multiPoint([[40, 30], [36, 53]], {hello: 'world'})
-        * ]);
-        *
-        * turf.flattenEach(features, function (currentFeature, featureIndex, multiFeatureIndex) {
-        *   //=currentFeature
-        *   //=featureIndex
-        *   //=multiFeatureIndex
-        * });
-        */
-       function flattenEach(geojson, callback) {
-           geomEach(geojson, function (geometry, featureIndex, properties, bbox, id) {
-               // Callback for single geometry
-               var type = (geometry === null) ? null : geometry.type;
-               switch (type) {
-               case null:
-               case 'Point':
-               case 'LineString':
-               case 'Polygon':
-                   if (callback(feature$1(geometry, properties, {bbox: bbox, id: id}), featureIndex, 0) === false) return false;
-                   return;
+             var comparator = this._comparator;
+             var t = splay(key, this._root, comparator);
+             var cmp = comparator(key, t.key);
+             if (cmp === 0) this._root = t;else {
+               if (cmp < 0) {
+                 node.left = t.left;
+                 node.right = t;
+                 t.left = null;
+               } else if (cmp > 0) {
+                 node.right = t.right;
+                 node.left = t;
+                 t.right = null;
                }
 
-               var geomType;
+               this._size++;
+               this._root = node;
+             }
+             return this._root;
+           }
+           /**
+            * @param  {Key} key
+            * @return {Node|null}
+            */
 
-               // Callback for multi-geometry
-               switch (type) {
-               case 'MultiPoint':
-                   geomType = 'Point';
-                   break;
-               case 'MultiLineString':
-                   geomType = 'LineString';
-                   break;
-               case 'MultiPolygon':
-                   geomType = 'Polygon';
-                   break;
-               }
+         }, {
+           key: "remove",
+           value: function remove(key) {
+             this._root = this._remove(key, this._root, this._comparator);
+           }
+           /**
+            * Deletes i from the tree if it's there
+            */
 
-               for (var multiFeatureIndex = 0; multiFeatureIndex < geometry.coordinates.length; multiFeatureIndex++) {
-                   var coordinate = geometry.coordinates[multiFeatureIndex];
-                   var geom = {
-                       type: geomType,
-                       coordinates: coordinate
-                   };
-                   if (callback(feature$1(geom, properties), featureIndex, multiFeatureIndex) === false) return false;
+         }, {
+           key: "_remove",
+           value: function _remove(i, t, comparator) {
+             var x;
+             if (t === null) return null;
+             t = splay(i, t, comparator);
+             var cmp = comparator(i, t.key);
+
+             if (cmp === 0) {
+               /* found it */
+               if (t.left === null) {
+                 x = t.right;
+               } else {
+                 x = splay(i, t.left, comparator);
+                 x.right = t.right;
                }
-           });
-       }
-
-       /**
-        * Takes one or more features and returns their area in square meters.
-        *
-        * @name area
-        * @param {GeoJSON} geojson input GeoJSON feature(s)
-        * @returns {number} area in square meters
-        * @example
-        * var polygon = turf.polygon([[[125, -15], [113, -22], [154, -27], [144, -15], [125, -15]]]);
-        *
-        * var area = turf.area(polygon);
-        *
-        * //addToMap
-        * var addToMap = [polygon]
-        * polygon.properties.area = area
-        */
-       function area(geojson) {
-           return geomReduce(geojson, function (value, geom) {
-               return value + calculateArea(geom);
-           }, 0);
-       }
 
-       var RADIUS$1 = 6378137;
-       // var FLATTENING_DENOM = 298.257223563;
-       // var FLATTENING = 1 / FLATTENING_DENOM;
-       // var POLAR_RADIUS = RADIUS * (1 - FLATTENING);
+               this._size--;
+               return x;
+             }
 
-       /**
-        * Calculate Area
-        *
-        * @private
-        * @param {GeoJSON} geojson GeoJSON
-        * @returns {number} area
-        */
-       function calculateArea(geojson) {
-           var area = 0, i;
-           switch (geojson.type) {
-           case 'Polygon':
-               return polygonArea$1(geojson.coordinates);
-           case 'MultiPolygon':
-               for (i = 0; i < geojson.coordinates.length; i++) {
-                   area += polygonArea$1(geojson.coordinates[i]);
-               }
-               return area;
-           case 'Point':
-           case 'MultiPoint':
-           case 'LineString':
-           case 'MultiLineString':
-               return 0;
-           case 'GeometryCollection':
-               for (i = 0; i < geojson.geometries.length; i++) {
-                   area += calculateArea(geojson.geometries[i]);
-               }
-               return area;
+             return t;
+             /* It wasn't there */
            }
-       }
+           /**
+            * Removes and returns the node with smallest key
+            */
+
+         }, {
+           key: "pop",
+           value: function pop() {
+             var node = this._root;
 
-       function polygonArea$1(coords) {
-           var area = 0;
-           if (coords && coords.length > 0) {
-               area += Math.abs(ringArea$1(coords[0]));
-               for (var i = 1; i < coords.length; i++) {
-                   area -= Math.abs(ringArea$1(coords[i]));
+             if (node) {
+               while (node.left) {
+                 node = node.left;
                }
+
+               this._root = splay(node.key, this._root, this._comparator);
+               this._root = this._remove(node.key, this._root, this._comparator);
+               return {
+                 key: node.key,
+                 data: node.data
+               };
+             }
+
+             return null;
            }
-           return area;
-       }
+           /**
+            * Find without splaying
+            */
 
-       /**
-        * @private
-        * Calculate the approximate area of the polygon were it projected onto the earth.
-        * Note that this area will be positive if ring is oriented clockwise, otherwise it will be negative.
-        *
-        * Reference:
-        * Robert. G. Chamberlain and William H. Duquette, "Some Algorithms for Polygons on a Sphere", JPL Publication 07-03, Jet Propulsion
-        * Laboratory, Pasadena, CA, June 2007 http://trs-new.jpl.nasa.gov/dspace/handle/2014/40409
-        *
-        * @param {Array<Array<number>>} coords Ring Coordinates
-        * @returns {number} The approximate signed geodesic area of the polygon in square meters.
-        */
-       function ringArea$1(coords) {
-           var p1;
-           var p2;
-           var p3;
-           var lowerIndex;
-           var middleIndex;
-           var upperIndex;
-           var i;
-           var area = 0;
-           var coordsLength = coords.length;
-
-           if (coordsLength > 2) {
-               for (i = 0; i < coordsLength; i++) {
-                   if (i === coordsLength - 2) { // i = N-2
-                       lowerIndex = coordsLength - 2;
-                       middleIndex = coordsLength - 1;
-                       upperIndex = 0;
-                   } else if (i === coordsLength - 1) { // i = N-1
-                       lowerIndex = coordsLength - 1;
-                       middleIndex = 0;
-                       upperIndex = 1;
-                   } else { // i = 0 to N-3
-                       lowerIndex = i;
-                       middleIndex = i + 1;
-                       upperIndex = i + 2;
-                   }
-                   p1 = coords[lowerIndex];
-                   p2 = coords[middleIndex];
-                   p3 = coords[upperIndex];
-                   area += (rad$1(p3[0]) - rad$1(p1[0])) * Math.sin(rad$1(p2[1]));
-               }
+         }, {
+           key: "findStatic",
+           value: function findStatic(key) {
+             var current = this._root;
+             var compare = this._comparator;
 
-               area = area * RADIUS$1 * RADIUS$1 / 2;
+             while (current) {
+               var cmp = compare(key, current.key);
+               if (cmp === 0) return current;else if (cmp < 0) current = current.left;else current = current.right;
+             }
+
+             return null;
            }
+         }, {
+           key: "find",
+           value: function find(key) {
+             if (this._root) {
+               this._root = splay(key, this._root, this._comparator);
+               if (this._comparator(key, this._root.key) !== 0) return null;
+             }
 
-           return area;
-       }
+             return this._root;
+           }
+         }, {
+           key: "contains",
+           value: function contains(key) {
+             var current = this._root;
+             var compare = this._comparator;
 
-       function rad$1(_) {
-           return _ * Math.PI / 180;
-       }
+             while (current) {
+               var cmp = compare(key, current.key);
+               if (cmp === 0) return true;else if (cmp < 0) current = current.left;else current = current.right;
+             }
 
-       /**
-        * Get Geometry from Feature or Geometry Object
-        *
-        * @param {Feature|Geometry} geojson GeoJSON Feature or Geometry Object
-        * @returns {Geometry|null} GeoJSON Geometry Object
-        * @throws {Error} if geojson is not a Feature or Geometry Object
-        * @example
-        * var point = {
-        *   "type": "Feature",
-        *   "properties": {},
-        *   "geometry": {
-        *     "type": "Point",
-        *     "coordinates": [110, 40]
-        *   }
-        * }
-        * var geom = turf.getGeom(point)
-        * //={"type": "Point", "coordinates": [110, 40]}
-        */
-       function getGeom(geojson) {
-           if (!geojson) throw new Error('geojson is required');
-           if (geojson.geometry !== undefined) return geojson.geometry;
-           if (geojson.coordinates || geojson.geometries) return geojson;
-           throw new Error('geojson must be a valid Feature or Geometry Object');
-       }
+             return false;
+           }
+         }, {
+           key: "forEach",
+           value: function forEach(visitor, ctx) {
+             var current = this._root;
+             var Q = [];
+             /* Initialize stack s */
+
+             var done = false;
+
+             while (!done) {
+               if (current !== null) {
+                 Q.push(current);
+                 current = current.left;
+               } else {
+                 if (Q.length !== 0) {
+                   current = Q.pop();
+                   visitor.call(ctx, current);
+                   current = current.right;
+                 } else done = true;
+               }
+             }
 
-       /**
-        * Finds the difference between two {@link Polygon|polygons} by clipping the second polygon from the first.
-        *
-        * @name difference
-        * @param {Feature<Polygon|MultiPolygon>} polygon1 input Polygon feature
-        * @param {Feature<Polygon|MultiPolygon>} polygon2 Polygon feature to difference from polygon1
-        * @returns {Feature<Polygon|MultiPolygon>|null} a Polygon or MultiPolygon feature showing the area of `polygon1` excluding the area of `polygon2` (if empty returns `null`)
-        * @example
-        * var polygon1 = turf.polygon([[
-        *   [128, -26],
-        *   [141, -26],
-        *   [141, -21],
-        *   [128, -21],
-        *   [128, -26]
-        * ]], {
-        *   "fill": "#F00",
-        *   "fill-opacity": 0.1
-        * });
-        * var polygon2 = turf.polygon([[
-        *   [126, -28],
-        *   [140, -28],
-        *   [140, -20],
-        *   [126, -20],
-        *   [126, -28]
-        * ]], {
-        *   "fill": "#00F",
-        *   "fill-opacity": 0.1
-        * });
-        *
-        * var difference = turf.difference(polygon1, polygon2);
-        *
-        * //addToMap
-        * var addToMap = [polygon1, polygon2, difference];
-        */
-       function difference(polygon1, polygon2) {
-           var geom1 = getGeom(polygon1);
-           var geom2 = getGeom(polygon2);
-           var properties = polygon1.properties || {};
+             return this;
+           }
+           /**
+            * Walk key range from `low` to `high`. Stops if `fn` returns a value.
+            */
 
-           // Issue #721 - JSTS can't handle empty polygons
-           geom1 = removeEmptyPolygon(geom1);
-           geom2 = removeEmptyPolygon(geom2);
-           if (!geom1) return null;
-           if (!geom2) return feature$1(geom1, properties);
+         }, {
+           key: "range",
+           value: function range(low, high, fn, ctx) {
+             var Q = [];
+             var compare = this._comparator;
+             var node = this._root;
+             var cmp;
+
+             while (Q.length !== 0 || node) {
+               if (node) {
+                 Q.push(node);
+                 node = node.left;
+               } else {
+                 node = Q.pop();
+                 cmp = compare(node.key, high);
 
-           // JSTS difference operation
-           var reader = new GeoJSONReader();
-           var a = reader.read(geom1);
-           var b = reader.read(geom2);
-           var differenced = OverlayOp.difference(a, b);
-           if (differenced.isEmpty()) return null;
-           var writer = new GeoJSONWriter();
-           var geom = writer.write(differenced);
+                 if (cmp > 0) {
+                   break;
+                 } else if (compare(node.key, low) >= 0) {
+                   if (fn.call(ctx, node)) return this; // stop if smth is returned
+                 }
 
-           return feature$1(geom, properties);
-       }
+                 node = node.right;
+               }
+             }
 
-       /**
-        * Detect Empty Polygon
-        *
-        * @private
-        * @param {Geometry<Polygon|MultiPolygon>} geom Geometry Object
-        * @returns {Geometry<Polygon|MultiPolygon>|null} removed any polygons with no areas
-        */
-       function removeEmptyPolygon(geom) {
-           switch (geom.type) {
-           case 'Polygon':
-               if (area(geom) > 1) return geom;
-               return null;
-           case 'MultiPolygon':
-               var coordinates = [];
-               flattenEach(geom, function (feature$$1) {
-                   if (area(feature$$1) > 1) coordinates.push(feature$$1.geometry.coordinates);
-               });
-               if (coordinates.length) return {type: 'MultiPolygon', coordinates: coordinates};
+             return this;
            }
-       }
+           /**
+            * Returns array of keys
+            */
 
-       /**
-        * Takes two or more {@link Polygon|polygons} and returns a combined polygon. If the input polygons are not contiguous, this function returns a {@link MultiPolygon} feature.
-        *
-        * @name union
-        * @param {...Feature<Polygon>} A polygon to combine
-        * @returns {Feature<(Polygon|MultiPolygon)>} a combined {@link Polygon} or {@link MultiPolygon} feature
-        * @example
-        * var poly1 = turf.polygon([[
-        *     [-82.574787, 35.594087],
-        *     [-82.574787, 35.615581],
-        *     [-82.545261, 35.615581],
-        *     [-82.545261, 35.594087],
-        *     [-82.574787, 35.594087]
-        * ]], {"fill": "#0f0"});
-        * var poly2 = turf.polygon([[
-        *     [-82.560024, 35.585153],
-        *     [-82.560024, 35.602602],
-        *     [-82.52964, 35.602602],
-        *     [-82.52964, 35.585153],
-        *     [-82.560024, 35.585153]
-        * ]], {"fill": "#00f"});
-        *
-        * var union = turf.union(poly1, poly2);
-        *
-        * //addToMap
-        * var addToMap = [poly1, poly2, union];
-        */
-       function union$1() {
-           var reader = new GeoJSONReader();
-           var result = reader.read(JSON.stringify(arguments[0].geometry));
+         }, {
+           key: "keys",
+           value: function keys() {
+             var keys = [];
+             this.forEach(function (_ref) {
+               var key = _ref.key;
+               return keys.push(key);
+             });
+             return keys;
+           }
+           /**
+            * Returns array of all the data in the nodes
+            */
 
-           for (var i = 1; i < arguments.length; i++) {
-               result = UnionOp.union(result, reader.read(JSON.stringify(arguments[i].geometry)));
+         }, {
+           key: "values",
+           value: function values() {
+             var values = [];
+             this.forEach(function (_ref2) {
+               var data = _ref2.data;
+               return values.push(data);
+             });
+             return values;
+           }
+         }, {
+           key: "min",
+           value: function min() {
+             if (this._root) return this.minNode(this._root).key;
+             return null;
+           }
+         }, {
+           key: "max",
+           value: function max() {
+             if (this._root) return this.maxNode(this._root).key;
+             return null;
+           }
+         }, {
+           key: "minNode",
+           value: function minNode() {
+             var t = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this._root;
+             if (t) while (t.left) {
+               t = t.left;
+             }
+             return t;
+           }
+         }, {
+           key: "maxNode",
+           value: function maxNode() {
+             var t = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this._root;
+             if (t) while (t.right) {
+               t = t.right;
+             }
+             return t;
            }
+           /**
+            * Returns node at given index
+            */
 
-           var writer = new GeoJSONWriter();
-           result = writer.write(result);
+         }, {
+           key: "at",
+           value: function at(index) {
+             var current = this._root;
+             var done = false;
+             var i = 0;
+             var Q = [];
 
-           return {
-               type: 'Feature',
-               geometry: result,
-               properties: arguments[0].properties
-           };
-       }
+             while (!done) {
+               if (current) {
+                 Q.push(current);
+                 current = current.left;
+               } else {
+                 if (Q.length > 0) {
+                   current = Q.pop();
+                   if (i === index) return current;
+                   i++;
+                   current = current.right;
+                 } else done = true;
+               }
+             }
 
-       // Reduce an array of locations into a single GeoJSON feature
-       function _locationReducer(accumulator, location) {
-         /* eslint-disable no-console, no-invalid-this */
-         let result;
-         try {
-           let resolved = this.resolveLocation(location);
-           if (!resolved || !resolved.feature) {
-             console.warn(`Warning:  Couldn't resolve location "${location}"`);
-             return accumulator;
+             return null;
            }
-           result = !accumulator ? resolved.feature : union$1(accumulator, resolved.feature);
-         } catch (e) {
-           console.warn(`Warning:  Error resolving location "${location}"`);
-           console.warn(e);
-           result = accumulator;
-         }
+         }, {
+           key: "next",
+           value: function next(d) {
+             var root = this._root;
+             var successor = null;
 
-         return result;
-         /* eslint-enable no-console, no-invalid-this */
-       }
+             if (d.right) {
+               successor = d.right;
 
+               while (successor.left) {
+                 successor = successor.left;
+               }
 
+               return successor;
+             }
 
-       function _cloneDeep(obj) {
-         return JSON.parse(JSON.stringify(obj));
-       }
+             var comparator = this._comparator;
 
+             while (root) {
+               var cmp = comparator(d.key, root.key);
+               if (cmp === 0) break;else if (cmp < 0) {
+                 successor = root;
+                 root = root.left;
+               } else root = root.right;
+             }
 
-       class LocationConflation {
+             return successor;
+           }
+         }, {
+           key: "prev",
+           value: function prev(d) {
+             var root = this._root;
+             var predecessor = null;
 
-         // constructor
-         //
-         // Optionally pass a GeoJSON FeatureCollection of known features which we can refer to later.
-         // Each feature must have a filename-like `id`, for example: `something.geojson`
-         //
-         // {
-         //   "type": "FeatureCollection"
-         //   "features": [
-         //     {
-         //       "type": "Feature",
-         //       "id": "philly_metro.geojson",
-         //       "properties": { … },
-         //       "geometry": { … }
-         //     }
-         //   ]
-         // }
-         constructor(fc) {
-           this._cache = {};
+             if (d.left !== null) {
+               predecessor = d.left;
 
-           // process input FeatureCollection
-           if (fc && fc.type === 'FeatureCollection' && Array.isArray(fc.features)) {
-             fc.features.forEach(feature => {
-               feature.properties = feature.properties || {};
-               let props = feature.properties;
+               while (predecessor.right) {
+                 predecessor = predecessor.right;
+               }
 
-               // get `id` from either `id` or `properties`
-               let id = feature.id || props.id;
-               if (!id || !/^\S+\.geojson$/i.test(id)) return;
+               return predecessor;
+             }
 
-               // ensure id exists and is lowercase
-               id = id.toLowerCase();
-               feature.id = id;
-               props.id = id;
+             var comparator = this._comparator;
 
-               // ensure area property exists
-               if (!props.area) {
-                 const area = geojsonArea.geometry(feature.geometry) / 1e6;  // m² to km²
-                 props.area = Number(area.toFixed(2));
+             while (root) {
+               var cmp = comparator(d.key, root.key);
+               if (cmp === 0) break;else if (cmp < 0) root = root.left;else {
+                 predecessor = root;
+                 root = root.right;
                }
+             }
 
-               this._cache[id] = feature;
-             });
+             return predecessor;
+           }
+         }, {
+           key: "clear",
+           value: function clear() {
+             this._root = null;
+             this._size = 0;
+             return this;
+           }
+         }, {
+           key: "toList",
+           value: function toList() {
+             return _toList(this._root);
            }
+           /**
+            * Bulk-load items. Both array have to be same size
+            */
 
-           // Replace CountryCoder world geometry to have a polygon covering the world.
-           let world = _cloneDeep(feature('Q2'));
-           world.geometry = {
-             type: 'Polygon',
-             coordinates: [[[-180, -90], [180, -90], [180, 90], [-180, 90], [-180, -90]]]
-           };
-           world.id = 'Q2';
-           world.properties.id = 'Q2';
-           world.properties.area = geojsonArea.geometry(world.geometry) / 1e6;  // m² to km²
-           this._cache.Q2 = world;
-         }
+         }, {
+           key: "load",
+           value: function load(keys) {
+             var values = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
+             var presort = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
+             var size = keys.length;
+             var comparator = this._comparator; // sort if needed
+
+             if (presort) sort$1(keys, values, 0, size - 1, comparator);
+
+             if (this._root === null) {
+               // empty tree
+               this._root = loadRecursive$1(keys, values, 0, size);
+               this._size = size;
+             } else {
+               // that re-builds the whole tree from two in-order traversals
+               var mergedList = mergeLists(this.toList(), createList(keys, values), comparator);
+               size = this._size + size;
+               this._root = sortedListToBST({
+                 head: mergedList
+               }, 0, size);
+             }
 
+             return this;
+           }
+         }, {
+           key: "isEmpty",
+           value: function isEmpty() {
+             return this._root === null;
+           }
+         }, {
+           key: "toString",
+           value: function toString() {
+             var printNode = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : function (n) {
+               return String(n.key);
+             };
+             var out = [];
+             printRow(this._root, '', true, function (v) {
+               return out.push(v);
+             }, printNode);
+             return out.join('');
+           }
+         }, {
+           key: "update",
+           value: function update(key, newKey, newData) {
+             var comparator = this._comparator;
 
-         // validateLocation
-         //
-         // Pass a `location` identifier
-         // Returns a result like
-         //   {
-         //     type:     'point', 'geojson', or 'countrycoder'
-         //     location:  the queried location
-         //     id:        a unique identifier
-         //   }
-         //  or `null` if the location is invalid
-         //
-         validateLocation(location) {
-           if (Array.isArray(location)) {   // a [lon,lat] coordinate pair?
-             if (location.length === 2 && Number.isFinite(location[0]) && Number.isFinite(location[1]) &&
-               location[0] >= -180 && location[0] <= 180 && location[1] >= -90 && location[1] <= 90
-             ) {
-               const id = '[' + location.toString() + ']';
-               return { type: 'point', location: location, id: id };
-             }
+             var _split2 = _split(key, this._root, comparator),
+                 left = _split2.left,
+                 right = _split2.right;
 
-           } else if (typeof location === 'string' && /^\S+\.geojson$/i.test(location)) {   // a .geojson filename?
-             const id = location.toLowerCase();
-             if (this._cache[id]) {
-               return { type: 'geojson', location: location, id: id };
+             if (comparator(key, newKey) < 0) {
+               right = _insert(newKey, newData, right, comparator);
+             } else {
+               left = _insert(newKey, newData, left, comparator);
              }
 
-           } else if (typeof location === 'string' || typeof location === 'number') {   // a country-coder value?
-             const feature$1 = feature(location);
-             if (feature$1) {
-               // Use wikidata QID as the identifier, since that seems to be the only
-               // property that everything in CountryCoder is guaranteed to have.
-               const id = feature$1.properties.wikidata;
-               return { type: 'countrycoder', location: location, id: id };
-             }
+             this._root = merge$4(left, right, comparator);
            }
+         }, {
+           key: "split",
+           value: function split(key) {
+             return _split(key, this._root, this._comparator);
+           }
+         }, {
+           key: "size",
+           get: function get() {
+             return this._size;
+           }
+         }, {
+           key: "root",
+           get: function get() {
+             return this._root;
+           }
+         }]);
 
-           return null;
+         return Tree;
+       }();
+
+       function loadRecursive$1(keys, values, start, end) {
+         var size = end - start;
+
+         if (size > 0) {
+           var middle = start + Math.floor(size / 2);
+           var key = keys[middle];
+           var data = values[middle];
+           var node = new Node$1(key, data);
+           node.left = loadRecursive$1(keys, values, start, middle);
+           node.right = loadRecursive$1(keys, values, middle + 1, end);
+           return node;
          }
 
+         return null;
+       }
 
-         // resolveLocation
-         //
-         // Pass a `location` identifier
-         // Returns a result like
-         //   {
-         //     type:      'point', 'geojson', or 'countrycoder'
-         //     location:  the queried location
-         //     id:        a unique identifier
-         //     feature:   the geojson feature
-         //   }
-         //  or `null` if the location is invalid
-         //
-         resolveLocation(location) {
-           const valid = this.validateLocation(location);
-           if (!valid) return null;
-
-           // return a result from cache if we can
-           if (this._cache[valid.id]) {
-             return Object.assign(valid, { feature: this._cache[valid.id] });
-           }
-
-           // a [lon,lat] coordinate pair?
-           if (valid.type === 'point') {
-             const RADIUS = 25000;  // meters
-             const EDGES = 10;
-             const PRECISION = 3;
-             const area = Math.PI * RADIUS * RADIUS / 1e6;     // m² to km²
-             const feature = this._cache[valid.id] = geojsonPrecision({
-               type: 'Feature',
-               id: valid.id,
-               properties: { id: valid.id, area: Number(area.toFixed(2)) },
-               geometry: circleToPolygon(location, RADIUS, EDGES)
-             }, PRECISION);
-             return Object.assign(valid, { feature: feature });
-
-           // a .geojson filename?
-           } else if (valid.type === 'geojson') ; else if (valid.type === 'countrycoder') {
-             let feature$1 = _cloneDeep(feature(valid.id));
-             let props = feature$1.properties;
-
-             // -> This block of code is weird and requires some explanation. <-
-             // CountryCoder includes higher level features which are made up of members.
-             // These features don't have their own geometry, but CountryCoder provides an
-             //   `aggregateFeature` method to combine these members into a MultiPolygon.
-             // BUT, when we try to actually work with these aggregated MultiPolygons,
-             //   Turf/JSTS gets crashy because of topography bugs.
-             // SO, we'll aggregate the features ourselves by unioning them together.
-             // This approach also has the benefit of removing all the internal boaders and
-             //   simplifying the regional polygons a lot.
-             if (Array.isArray(props.members)) {
-               let seed = feature$1.geometry ? feature$1 : null;
-               let aggregate = props.members.reduce(_locationReducer.bind(this), seed);
-               feature$1.geometry = aggregate.geometry;
-             }
-
-             // ensure area property exists
-             if (!props.area) {
-               const area = geojsonArea.geometry(feature$1.geometry) / 1e6;  // m² to km²
-               props.area = Number(area.toFixed(2));
-             }
-
-             // ensure id property exists
-             feature$1.id = valid.id;
-             props.id = valid.id;
-
-             this._cache[valid.id] = feature$1;
-             return Object.assign(valid, { feature: feature$1 });
-           }
+       function createList(keys, values) {
+         var head = new Node$1(null, null);
+         var p = head;
 
-           return null;
+         for (var i = 0; i < keys.length; i++) {
+           p = p.next = new Node$1(keys[i], values[i]);
          }
 
+         p.next = null;
+         return head.next;
+       }
 
-         // resolveLocationSet
-         //
-         // Pass a `locationSet` Object like:
-         //   `{ include: [ Array ], exclude: [ Array ] }`
-         // Returns a stable identifier string of the form:
-         //   "+[included]-[excluded]"
-         //
-         resolveLocationSet(locationSet) {
-           locationSet = locationSet || {};
-           const resolve = this.resolveLocation.bind(this);
-           let include = (locationSet.include || []).map(resolve).filter(Boolean);
-           let exclude = (locationSet.exclude || []).map(resolve).filter(Boolean);
+       function _toList(root) {
+         var current = root;
+         var Q = [];
+         var done = false;
+         var head = new Node$1(null, null);
+         var p = head;
 
-           if (!include.length) {
-             include = [resolve('Q2')];   // default to 'the world'
+         while (!done) {
+           if (current) {
+             Q.push(current);
+             current = current.left;
+           } else {
+             if (Q.length > 0) {
+               current = p = p.next = Q.pop();
+               current = current.right;
+             } else done = true;
            }
+         }
 
-           // return quickly if it's a single included location..
-           if (include.length === 1 && exclude.length === 0) {
-             return include[0].feature;
-           }
+         p.next = null; // that'll work even if the tree was empty
 
-           // generate stable identifier
-           include.sort(sortFeatures);
-           let id = '+[' + include.map(d => d.id).join(',') + ']';
-           if (exclude.length) {
-             exclude.sort(sortFeatures);
-             id += '-[' + exclude.map(d => d.id).join(',') + ']';
-           }
+         return head.next;
+       }
+
+       function sortedListToBST(list, start, end) {
+         var size = end - start;
+
+         if (size > 0) {
+           var middle = start + Math.floor(size / 2);
+           var left = sortedListToBST(list, start, middle);
+           var root = list.head;
+           root.left = left;
+           list.head = list.head.next;
+           root.right = sortedListToBST(list, middle + 1, end);
+           return root;
+         }
+
+         return null;
+       }
+
+       function mergeLists(l1, l2, compare) {
+         var head = new Node$1(null, null); // dummy
 
-           // return cached?
-           if (this._cache[id]) {
-             return this._cache[id];
+         var p = head;
+         var p1 = l1;
+         var p2 = l2;
+
+         while (p1 !== null && p2 !== null) {
+           if (compare(p1.key, p2.key) < 0) {
+             p.next = p1;
+             p1 = p1.next;
+           } else {
+             p.next = p2;
+             p2 = p2.next;
            }
 
-           // calculate unions
-           let includeGeoJSON = include.map(d => d.location).reduce(_locationReducer.bind(this), null);
-           let excludeGeoJSON = exclude.map(d => d.location).reduce(_locationReducer.bind(this), null);
+           p = p.next;
+         }
 
-           // calculate difference, update area and return result
-           let resultGeoJSON = excludeGeoJSON ? difference(includeGeoJSON, excludeGeoJSON) : includeGeoJSON;
-           const area = geojsonArea.geometry(resultGeoJSON.geometry) / 1e6;  // m² to km²
-           resultGeoJSON.id = id;
-           resultGeoJSON.properties = { id: id, area: Number(area.toFixed(2)) };
+         if (p1 !== null) {
+           p.next = p1;
+         } else if (p2 !== null) {
+           p.next = p2;
+         }
 
-           return this._cache[id] = resultGeoJSON;
+         return head.next;
+       }
 
+       function sort$1(keys, values, left, right, compare) {
+         if (left >= right) return;
+         var pivot = keys[left + right >> 1];
+         var i = left - 1;
+         var j = right + 1;
 
-           // Sorting the location lists is ok because they end up unioned together.
-           // This sorting makes it possible to generate a deterministic id.
-           function sortFeatures(a, b) {
-             const rank = { countrycoder: 1, geojson: 2, point: 3 };
-             const aRank = rank[a.type];
-             const bRank = rank[b.type];
+         while (true) {
+           do {
+             i++;
+           } while (compare(keys[i], pivot) < 0);
 
-             return (aRank > bRank) ? 1
-               : (aRank < bRank) ? -1
-               : a.id.localeCompare(b.id);
-           }
+           do {
+             j--;
+           } while (compare(keys[j], pivot) > 0);
+
+           if (i >= j) break;
+           var tmp = keys[i];
+           keys[i] = keys[j];
+           keys[j] = tmp;
+           tmp = values[i];
+           values[i] = values[j];
+           values[j] = tmp;
          }
 
+         sort$1(keys, values, left, j, compare);
+         sort$1(keys, values, j + 1, right, compare);
+       }
 
-         cache() {
-           return this._cache;
+       function _classCallCheck$1(instance, Constructor) {
+         if (!(instance instanceof Constructor)) {
+           throw new TypeError("Cannot call a class as a function");
          }
        }
 
-       let _oci = null;
+       function _defineProperties$1(target, props) {
+         for (var i = 0; i < props.length; i++) {
+           var descriptor = props[i];
+           descriptor.enumerable = descriptor.enumerable || false;
+           descriptor.configurable = true;
+           if ("value" in descriptor) descriptor.writable = true;
+           Object.defineProperty(target, descriptor.key, descriptor);
+         }
+       }
 
-       function uiSuccess(context) {
-         const MAXEVENTS = 2;
-         const dispatch$1 = dispatch('cancel');
-         let _changeset;
-         let _location;
-         ensureOSMCommunityIndex();   // start fetching the data
+       function _createClass$1(Constructor, protoProps, staticProps) {
+         if (protoProps) _defineProperties$1(Constructor.prototype, protoProps);
+         if (staticProps) _defineProperties$1(Constructor, staticProps);
+         return Constructor;
+       }
+       /**
+        * A bounding box has the format:
+        *
+        *  { ll: { x: xmin, y: ymin }, ur: { x: xmax, y: ymax } }
+        *
+        */
 
 
-         function ensureOSMCommunityIndex() {
-           const data = _mainFileFetcher;
-           return Promise.all([ data.get('oci_resources'), data.get('oci_features') ])
-             .then(vals => {
-               if (_oci) return _oci;
-
-               const ociResources = vals[0].resources;
-               const loco = new LocationConflation(vals[1]);
-               let ociFeatures = {};
-
-               Object.values(ociResources).forEach(resource => {
-                 const feature = loco.resolveLocationSet(resource.locationSet);
-                 let ociFeature = ociFeatures[feature.id];
-                 if (!ociFeature) {
-                   ociFeature = JSON.parse(JSON.stringify(feature));  // deep clone
-                   ociFeature.properties.resourceIDs = new Set();
-                   ociFeatures[feature.id] = ociFeature;
-                 }
-                 ociFeature.properties.resourceIDs.add(resource.id);
-               });
+       var isInBbox = function isInBbox(bbox, point) {
+         return bbox.ll.x <= point.x && point.x <= bbox.ur.x && bbox.ll.y <= point.y && point.y <= bbox.ur.y;
+       };
+       /* Returns either null, or a bbox (aka an ordered pair of points)
+        * If there is only one point of overlap, a bbox with identical points
+        * will be returned */
 
-               return _oci = {
-                 features: ociFeatures,
-                 resources: ociResources,
-                 query: whichPolygon_1({ type: 'FeatureCollection', features: Object.values(ociFeatures) })
-               };
-             });
-         }
 
+       var getBboxOverlap = function getBboxOverlap(b1, b2) {
+         // check if the bboxes overlap at all
+         if (b2.ur.x < b1.ll.x || b1.ur.x < b2.ll.x || b2.ur.y < b1.ll.y || b1.ur.y < b2.ll.y) return null; // find the middle two X values
 
-         // string-to-date parsing in JavaScript is weird
-         function parseEventDate(when) {
-           if (!when) return;
+         var lowerX = b1.ll.x < b2.ll.x ? b2.ll.x : b1.ll.x;
+         var upperX = b1.ur.x < b2.ur.x ? b1.ur.x : b2.ur.x; // find the middle two Y values
 
-           let raw = when.trim();
-           if (!raw) return;
+         var lowerY = b1.ll.y < b2.ll.y ? b2.ll.y : b1.ll.y;
+         var upperY = b1.ur.y < b2.ur.y ? b1.ur.y : b2.ur.y; // put those middle values together to get the overlap
 
-           if (!/Z$/.test(raw)) {   // if no trailing 'Z', add one
-             raw += 'Z';            // this forces date to be parsed as a UTC date
+         return {
+           ll: {
+             x: lowerX,
+             y: lowerY
+           },
+           ur: {
+             x: upperX,
+             y: upperY
            }
+         };
+       };
+       /* Javascript doesn't do integer math. Everything is
+        * floating point with percision Number.EPSILON.
+        *
+        * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/EPSILON
+        */
 
-           const parsed = new Date(raw);
-           return new Date(parsed.toUTCString().substr(0, 25));  // convert to local timezone
-         }
 
+       var epsilon$2 = Number.EPSILON; // IE Polyfill
 
-         function success(selection) {
-           let header = selection
-             .append('div')
-             .attr('class', 'header fillL');
-
-           header
-             .append('h3')
-             .text(_t('success.just_edited'));
-
-           header
-             .append('button')
-             .attr('class', 'close')
-             .on('click', () => dispatch$1.call('cancel'))
-             .call(svgIcon('#iD-icon-close'));
-
-           let body = selection
-             .append('div')
-             .attr('class', 'body save-success fillL');
-
-           let summary = body
-             .append('div')
-             .attr('class', 'save-summary');
-
-           summary
-             .append('h3')
-             .text(_t('success.thank_you' + (_location ? '_location' : ''), { where: _location }));
-
-           summary
-             .append('p')
-             .text(_t('success.help_html'))
-             .append('a')
-             .attr('class', 'link-out')
-             .attr('target', '_blank')
-             .attr('tabindex', -1)
-             .attr('href', _t('success.help_link_url'))
-             .call(svgIcon('#iD-icon-out-link', 'inline'))
-             .append('span')
-             .text(_t('success.help_link_text'));
-
-           let osm = context.connection();
-           if (!osm) return;
+       if (epsilon$2 === undefined) epsilon$2 = Math.pow(2, -52);
+       var EPSILON_SQ = epsilon$2 * epsilon$2;
+       /* FLP comparator */
 
-           let changesetURL = osm.changesetURL(_changeset.id);
-
-           let table = summary
-             .append('table')
-             .attr('class', 'summary-table');
-
-           let row = table
-             .append('tr')
-             .attr('class', 'summary-row');
-
-           row
-             .append('td')
-             .attr('class', 'cell-icon summary-icon')
-             .append('a')
-             .attr('target', '_blank')
-             .attr('href', changesetURL)
-             .append('svg')
-             .attr('class', 'logo-small')
-             .append('use')
-             .attr('xlink:href', '#iD-logo-osm');
-
-           let summaryDetail = row
-             .append('td')
-             .attr('class', 'cell-detail summary-detail');
-
-           summaryDetail
-             .append('a')
-             .attr('class', 'cell-detail summary-view-on-osm')
-             .attr('target', '_blank')
-             .attr('href', changesetURL)
-             .text(_t('success.view_on_osm'));
-
-           summaryDetail
-             .append('div')
-             .html(_t('success.changeset_id', {
-               changeset_id: `<a href="${changesetURL}" target="_blank">${_changeset.id}</a>`
-             }));
+       var cmp = function cmp(a, b) {
+         // check if they're both 0
+         if (-epsilon$2 < a && a < epsilon$2) {
+           if (-epsilon$2 < b && b < epsilon$2) {
+             return 0;
+           }
+         } // check if they're flp equal
 
 
-           // Get OSM community index features intersecting the map..
-           ensureOSMCommunityIndex()
-             .then(oci => {
-               let communities = [];
-               const properties = oci.query(context.map().center(), true) || [];
-
-               // Gather the communities from the result
-               properties.forEach(props => {
-                 const resourceIDs = Array.from(props.resourceIDs);
-                 resourceIDs.forEach(resourceID => {
-                   const resource = oci.resources[resourceID];
-                   communities.push({
-                     area: props.area || Infinity,
-                     order: resource.order || 0,
-                     resource: resource
-                   });
-                 });
-               });
+         var ab = a - b;
 
-               // sort communities by feature area ascending, community order descending
-               communities.sort((a, b) => a.area - b.area || b.order - a.order);
+         if (ab * ab < EPSILON_SQ * a * b) {
+           return 0;
+         } // normal comparison
 
-               body
-                 .call(showCommunityLinks, communities.map(c => c.resource));
-             });
-         }
 
+         return a < b ? -1 : 1;
+       };
+       /**
+        * This class rounds incoming values sufficiently so that
+        * floating points problems are, for the most part, avoided.
+        *
+        * Incoming points are have their x & y values tested against
+        * all previously seen x & y values. If either is 'too close'
+        * to a previously seen value, it's value is 'snapped' to the
+        * previously seen value.
+        *
+        * All points should be rounded by this class before being
+        * stored in any data structures in the rest of this algorithm.
+        */
 
-         function showCommunityLinks(selection, resources) {
-           let communityLinks = selection
-             .append('div')
-             .attr('class', 'save-communityLinks');
-
-           communityLinks
-             .append('h3')
-             .text(_t('success.like_osm'));
-
-           let table = communityLinks
-             .append('table')
-             .attr('class', 'community-table');
-
-           let row = table.selectAll('.community-row')
-             .data(resources);
-
-           let rowEnter = row.enter()
-             .append('tr')
-             .attr('class', 'community-row');
-
-           rowEnter
-             .append('td')
-             .attr('class', 'cell-icon community-icon')
-             .append('a')
-             .attr('target', '_blank')
-             .attr('href', d => d.url)
-             .append('svg')
-             .attr('class', 'logo-small')
-             .append('use')
-             .attr('xlink:href', d => `#community-${d.type}`);
-
-           let communityDetail = rowEnter
-             .append('td')
-             .attr('class', 'cell-detail community-detail');
-
-           communityDetail
-             .each(showCommunityDetails);
-
-           communityLinks
-             .append('div')
-             .attr('class', 'community-missing')
-             .text(_t('success.missing'))
-             .append('a')
-             .attr('class', 'link-out')
-             .attr('target', '_blank')
-             .attr('tabindex', -1)
-             .call(svgIcon('#iD-icon-out-link', 'inline'))
-             .attr('href', 'https://github.com/osmlab/osm-community-index/issues')
-             .append('span')
-             .text(_t('success.tell_us'));
-         }
 
+       var PtRounder = /*#__PURE__*/function () {
+         function PtRounder() {
+           _classCallCheck$1(this, PtRounder);
 
-         function showCommunityDetails(d) {
-           let selection = select(this);
-           let communityID = d.id;
-           let replacements = {
-             url: linkify(d.url),
-             signupUrl: linkify(d.signupUrl || d.url)
-           };
+           this.reset();
+         }
 
-           selection
-             .append('div')
-             .attr('class', 'community-name')
-             .append('a')
-             .attr('target', '_blank')
-             .attr('href', d.url)
-             .text(_t(`community.${d.id}.name`));
-
-           let descriptionHTML = _t(`community.${d.id}.description`, replacements);
-
-           if (d.type === 'reddit') {   // linkify subreddits  #4997
-             descriptionHTML = descriptionHTML
-               .replace(/(\/r\/\w*\/*)/i, match => linkify(d.url, match));
-           }
-
-           selection
-             .append('div')
-             .attr('class', 'community-description')
-             .html(descriptionHTML);
-
-           if (d.extendedDescription || (d.languageCodes && d.languageCodes.length)) {
-             selection
-               .append('div')
-               .call(uiDisclosure(context, `community-more-${d.id}`, false)
-                 .expanded(false)
-                 .updatePreference(false)
-                 .title(_t('success.more'))
-                 .content(showMore)
-               );
+         _createClass$1(PtRounder, [{
+           key: "reset",
+           value: function reset() {
+             this.xRounder = new CoordRounder();
+             this.yRounder = new CoordRounder();
+           }
+         }, {
+           key: "round",
+           value: function round(x, y) {
+             return {
+               x: this.xRounder.round(x),
+               y: this.yRounder.round(y)
+             };
            }
+         }]);
 
-           let nextEvents = (d.events || [])
-             .map(event => {
-               event.date = parseEventDate(event.when);
-               return event;
-             })
-             .filter(event => {      // date is valid and future (or today)
-               const t = event.date.getTime();
-               const now = (new Date()).setHours(0,0,0,0);
-               return !isNaN(t) && t >= now;
-             })
-             .sort((a, b) => {       // sort by date ascending
-               return a.date < b.date ? -1 : a.date > b.date ? 1 : 0;
-             })
-             .slice(0, MAXEVENTS);   // limit number of events shown
+         return PtRounder;
+       }();
 
-           if (nextEvents.length) {
-             selection
-               .append('div')
-               .call(uiDisclosure(context, `community-events-${d.id}`, false)
-                 .expanded(false)
-                 .updatePreference(false)
-                 .title(_t('success.events'))
-                 .content(showNextEvents)
-               )
-               .select('.hide-toggle')
-               .append('span')
-               .attr('class', 'badge-text')
-               .text(nextEvents.length);
-           }
+       var CoordRounder = /*#__PURE__*/function () {
+         function CoordRounder() {
+           _classCallCheck$1(this, CoordRounder);
 
+           this.tree = new Tree(); // preseed with 0 so we don't end up with values < Number.EPSILON
 
-           function showMore(selection) {
-             let more = selection.selectAll('.community-more')
-               .data([0]);
+           this.round(0);
+         } // Note: this can rounds input values backwards or forwards.
+         //       You might ask, why not restrict this to just rounding
+         //       forwards? Wouldn't that allow left endpoints to always
+         //       remain left endpoints during splitting (never change to
+         //       right). No - it wouldn't, because we snap intersections
+         //       to endpoints (to establish independence from the segment
+         //       angle for t-intersections).
 
-             let moreEnter = more.enter()
-               .append('div')
-               .attr('class', 'community-more');
 
-             if (d.extendedDescription) {
-               moreEnter
-                 .append('div')
-                 .attr('class', 'community-extended-description')
-                 .html(_t(`community.${d.id}.extendedDescription`, replacements));
+         _createClass$1(CoordRounder, [{
+           key: "round",
+           value: function round(coord) {
+             var node = this.tree.add(coord);
+             var prevNode = this.tree.prev(node);
+
+             if (prevNode !== null && cmp(node.key, prevNode.key) === 0) {
+               this.tree.remove(coord);
+               return prevNode.key;
              }
 
-             if (d.languageCodes && d.languageCodes.length) {
-               const languageList = d.languageCodes
-                 .map(code => _mainLocalizer.languageName(code))
-                 .join(', ');
+             var nextNode = this.tree.next(node);
 
-               moreEnter
-                 .append('div')
-                 .attr('class', 'community-languages')
-                 .text(_t('success.languages', { languages: languageList }));
+             if (nextNode !== null && cmp(node.key, nextNode.key) === 0) {
+               this.tree.remove(coord);
+               return nextNode.key;
              }
-           }
 
+             return coord;
+           }
+         }]);
 
-           function showNextEvents(selection) {
-             let events = selection
-               .append('div')
-               .attr('class', 'community-events');
+         return CoordRounder;
+       }(); // singleton available by import
 
-             let item = events.selectAll('.community-event')
-               .data(nextEvents);
 
-             let itemEnter = item.enter()
-               .append('div')
-               .attr('class', 'community-event');
+       var rounder = new PtRounder();
+       /* Cross Product of two vectors with first point at origin */
 
-             itemEnter
-               .append('div')
-               .attr('class', 'community-event-name')
-               .append('a')
-               .attr('target', '_blank')
-               .attr('href', d => d.url)
-               .text(d => {
-                 let name = d.name;
-                 if (d.i18n && d.id) {
-                   name = _t(`community.${communityID}.events.${d.id}.name`, { default: name });
-                 }
-                 return name;
-               });
+       var crossProduct$1 = function crossProduct(a, b) {
+         return a.x * b.y - a.y * b.x;
+       };
+       /* Dot Product of two vectors with first point at origin */
 
-             itemEnter
-               .append('div')
-               .attr('class', 'community-event-when')
-               .text(d => {
-                 let options = { weekday: 'short', day: 'numeric', month: 'short', year: 'numeric' };
-                 if (d.date.getHours() || d.date.getMinutes()) {   // include time if it has one
-                   options.hour = 'numeric';
-                   options.minute = 'numeric';
-                 }
-                 return d.date.toLocaleString(_mainLocalizer.localeCode(), options);
-               });
 
-             itemEnter
-               .append('div')
-               .attr('class', 'community-event-where')
-               .text(d => {
-                 let where = d.where;
-                 if (d.i18n && d.id) {
-                   where = _t(`community.${communityID}.events.${d.id}.where`, { default: where });
-                 }
-                 return where;
-               });
+       var dotProduct$1 = function dotProduct(a, b) {
+         return a.x * b.x + a.y * b.y;
+       };
+       /* Comparator for two vectors with same starting point */
 
-             itemEnter
-               .append('div')
-               .attr('class', 'community-event-description')
-               .text(d => {
-                 let description = d.description;
-                 if (d.i18n && d.id) {
-                   description = _t(`community.${communityID}.events.${d.id}.description`, { default: description });
-                 }
-                 return description;
-               });
-           }
 
+       var compareVectorAngles = function compareVectorAngles(basePt, endPt1, endPt2) {
+         var v1 = {
+           x: endPt1.x - basePt.x,
+           y: endPt1.y - basePt.y
+         };
+         var v2 = {
+           x: endPt2.x - basePt.x,
+           y: endPt2.y - basePt.y
+         };
+         var kross = crossProduct$1(v1, v2);
+         return cmp(kross, 0);
+       };
 
-           function linkify(url, text) {
-             text = text || url;
-             return `<a target="_blank" href="${url}">${text}</a>`;
-           }
-         }
+       var length = function length(v) {
+         return Math.sqrt(dotProduct$1(v, v));
+       };
+       /* Get the sine of the angle from pShared -> pAngle to pShaed -> pBase */
 
 
-         success.changeset = function(val) {
-           if (!arguments.length) return _changeset;
-           _changeset = val;
-           return success;
+       var sineOfAngle = function sineOfAngle(pShared, pBase, pAngle) {
+         var vBase = {
+           x: pBase.x - pShared.x,
+           y: pBase.y - pShared.y
+         };
+         var vAngle = {
+           x: pAngle.x - pShared.x,
+           y: pAngle.y - pShared.y
          };
+         return crossProduct$1(vAngle, vBase) / length(vAngle) / length(vBase);
+       };
+       /* Get the cosine of the angle from pShared -> pAngle to pShaed -> pBase */
 
 
-         success.location = function(val) {
-           if (!arguments.length) return _location;
-           _location = val;
-           return success;
+       var cosineOfAngle = function cosineOfAngle(pShared, pBase, pAngle) {
+         var vBase = {
+           x: pBase.x - pShared.x,
+           y: pBase.y - pShared.y
          };
+         var vAngle = {
+           x: pAngle.x - pShared.x,
+           y: pAngle.y - pShared.y
+         };
+         return dotProduct$1(vAngle, vBase) / length(vAngle) / length(vBase);
+       };
+       /* Get the x coordinate where the given line (defined by a point and vector)
+        * crosses the horizontal line with the given y coordiante.
+        * In the case of parrallel lines (including overlapping ones) returns null. */
 
 
-         return utilRebind(success, dispatch$1, 'on');
-       }
+       var horizontalIntersection = function horizontalIntersection(pt, v, y) {
+         if (v.y === 0) return null;
+         return {
+           x: pt.x + v.x / v.y * (y - pt.y),
+           y: y
+         };
+       };
+       /* Get the y coordinate where the given line (defined by a point and vector)
+        * crosses the vertical line with the given x coordiante.
+        * In the case of parrallel lines (including overlapping ones) returns null. */
 
-       function modeSave(context) {
-           var mode = { id: 'save' };
-           var keybinding = utilKeybinding('modeSave');
 
-           var commit = uiCommit(context)
-               .on('cancel', cancel);
-           var _conflictsUi; // uiConflicts
+       var verticalIntersection = function verticalIntersection(pt, v, x) {
+         if (v.x === 0) return null;
+         return {
+           x: x,
+           y: pt.y + v.y / v.x * (x - pt.x)
+         };
+       };
+       /* Get the intersection of two lines, each defined by a base point and a vector.
+        * In the case of parrallel lines (including overlapping ones) returns null. */
+
+
+       var intersection$1 = function intersection(pt1, v1, pt2, v2) {
+         // take some shortcuts for vertical and horizontal lines
+         // this also ensures we don't calculate an intersection and then discover
+         // it's actually outside the bounding box of the line
+         if (v1.x === 0) return verticalIntersection(pt2, v2, pt1.x);
+         if (v2.x === 0) return verticalIntersection(pt1, v1, pt2.x);
+         if (v1.y === 0) return horizontalIntersection(pt2, v2, pt1.y);
+         if (v2.y === 0) return horizontalIntersection(pt1, v1, pt2.y); // General case for non-overlapping segments.
+         // This algorithm is based on Schneider and Eberly.
+         // http://www.cimec.org.ar/~ncalvo/Schneider_Eberly.pdf - pg 244
+
+         var kross = crossProduct$1(v1, v2);
+         if (kross == 0) return null;
+         var ve = {
+           x: pt2.x - pt1.x,
+           y: pt2.y - pt1.y
+         };
+         var d1 = crossProduct$1(ve, v1) / kross;
+         var d2 = crossProduct$1(ve, v2) / kross; // take the average of the two calculations to minimize rounding error
+
+         var x1 = pt1.x + d2 * v1.x,
+             x2 = pt2.x + d1 * v2.x;
+         var y1 = pt1.y + d2 * v1.y,
+             y2 = pt2.y + d1 * v2.y;
+         var x = (x1 + x2) / 2;
+         var y = (y1 + y2) / 2;
+         return {
+           x: x,
+           y: y
+         };
+       };
+
+       var SweepEvent$1 = /*#__PURE__*/function () {
+         _createClass$1(SweepEvent, null, [{
+           key: "compare",
+           // for ordering sweep events in the sweep event queue
+           value: function compare(a, b) {
+             // favor event with a point that the sweep line hits first
+             var ptCmp = SweepEvent.comparePoints(a.point, b.point);
+             if (ptCmp !== 0) return ptCmp; // the points are the same, so link them if needed
 
-           var _location;
-           var _success;
+             if (a.point !== b.point) a.link(b); // favor right events over left
 
-           var uploader = context.uploader()
-               .on('saveStarted.modeSave', function() {
-                   keybindingOff();
-               })
-               // fire off some async work that we want to be ready later
-               .on('willAttemptUpload.modeSave', prepareForSuccess)
-               .on('progressChanged.modeSave', showProgress)
-               .on('resultNoChanges.modeSave', function() {
-                   cancel();
-               })
-               .on('resultErrors.modeSave', showErrors)
-               .on('resultConflicts.modeSave', showConflicts)
-               .on('resultSuccess.modeSave', showSuccess);
+             if (a.isLeft !== b.isLeft) return a.isLeft ? 1 : -1; // we have two matching left or right endpoints
+             // ordering of this case is the same as for their segments
 
+             return Segment.compare(a.segment, b.segment);
+           } // for ordering points in sweep line order
 
-           function cancel() {
-               context.enter(modeBrowse(context));
-           }
+         }, {
+           key: "comparePoints",
+           value: function comparePoints(aPt, bPt) {
+             if (aPt.x < bPt.x) return -1;
+             if (aPt.x > bPt.x) return 1;
+             if (aPt.y < bPt.y) return -1;
+             if (aPt.y > bPt.y) return 1;
+             return 0;
+           } // Warning: 'point' input will be modified and re-used (for performance)
 
+         }]);
 
-           function showProgress(num, total) {
-               var modal = context.container().select('.loading-modal .modal-section');
-               var progress = modal.selectAll('.progress')
-                   .data([0]);
+         function SweepEvent(point, isLeft) {
+           _classCallCheck$1(this, SweepEvent);
 
-               // enter/update
-               progress.enter()
-                   .append('div')
-                   .attr('class', 'progress')
-                   .merge(progress)
-                   .text(_t('save.conflict_progress', { num: num, total: total }));
-           }
+           if (point.events === undefined) point.events = [this];else point.events.push(this);
+           this.point = point;
+           this.isLeft = isLeft; // this.segment, this.otherSE set by factory
+         }
 
+         _createClass$1(SweepEvent, [{
+           key: "link",
+           value: function link(other) {
+             if (other.point === this.point) {
+               throw new Error('Tried to link already linked events');
+             }
 
-           function showConflicts(changeset, conflicts, origChanges) {
+             var otherEvents = other.point.events;
 
-               var selection = context.container()
-                   .select('.sidebar')
-                   .append('div')
-                   .attr('class','sidebar-component');
-
-               context.container().selectAll('.main-content')
-                   .classed('active', true)
-                   .classed('inactive', false);
-
-               _conflictsUi = uiConflicts(context)
-                   .conflictList(conflicts)
-                   .origChanges(origChanges)
-                   .on('cancel', function() {
-                       context.container().selectAll('.main-content')
-                           .classed('active', false)
-                           .classed('inactive', true);
-                       selection.remove();
-                       keybindingOn();
-
-                       uploader.cancelConflictResolution();
-                   })
-                   .on('save', function() {
-                       context.container().selectAll('.main-content')
-                           .classed('active', false)
-                           .classed('inactive', true);
-                       selection.remove();
-
-                       uploader.processResolvedConflicts(changeset);
-                   });
+             for (var i = 0, iMax = otherEvents.length; i < iMax; i++) {
+               var evt = otherEvents[i];
+               this.point.events.push(evt);
+               evt.point = this.point;
+             }
 
-               selection.call(_conflictsUi);
+             this.checkForConsuming();
            }
+           /* Do a pass over our linked events and check to see if any pair
+            * of segments match, and should be consumed. */
+
+         }, {
+           key: "checkForConsuming",
+           value: function checkForConsuming() {
+             // FIXME: The loops in this method run O(n^2) => no good.
+             //        Maintain little ordered sweep event trees?
+             //        Can we maintaining an ordering that avoids the need
+             //        for the re-sorting with getLeftmostComparator in geom-out?
+             // Compare each pair of events to see if other events also match
+             var numEvents = this.point.events.length;
+
+             for (var i = 0; i < numEvents; i++) {
+               var evt1 = this.point.events[i];
+               if (evt1.segment.consumedBy !== undefined) continue;
 
+               for (var j = i + 1; j < numEvents; j++) {
+                 var evt2 = this.point.events[j];
+                 if (evt2.consumedBy !== undefined) continue;
+                 if (evt1.otherSE.point.events !== evt2.otherSE.point.events) continue;
+                 evt1.segment.consume(evt2.segment);
+               }
+             }
+           }
+         }, {
+           key: "getAvailableLinkedEvents",
+           value: function getAvailableLinkedEvents() {
+             // point.events is always of length 2 or greater
+             var events = [];
 
-           function showErrors(errors) {
-               keybindingOn();
+             for (var i = 0, iMax = this.point.events.length; i < iMax; i++) {
+               var evt = this.point.events[i];
 
-               var selection = uiConfirm(context.container());
-               selection
-                   .select('.modal-section.header')
-                   .append('h3')
-                   .text(_t('save.error'));
+               if (evt !== this && !evt.segment.ringOut && evt.segment.isInResult()) {
+                 events.push(evt);
+               }
+             }
 
-               addErrors(selection, errors);
-               selection.okButton();
+             return events;
            }
+           /**
+            * Returns a comparator function for sorting linked events that will
+            * favor the event that will give us the smallest left-side angle.
+            * All ring construction starts as low as possible heading to the right,
+            * so by always turning left as sharp as possible we'll get polygons
+            * without uncessary loops & holes.
+            *
+            * The comparator function has a compute cache such that it avoids
+            * re-computing already-computed values.
+            */
 
+         }, {
+           key: "getLeftmostComparator",
+           value: function getLeftmostComparator(baseEvent) {
+             var _this = this;
 
-           function addErrors(selection, data) {
-               var message = selection
-                   .select('.modal-section.message-text');
+             var cache = new Map();
 
-               var items = message
-                   .selectAll('.error-container')
-                   .data(data);
+             var fillCache = function fillCache(linkedEvent) {
+               var nextEvent = linkedEvent.otherSE;
+               cache.set(linkedEvent, {
+                 sine: sineOfAngle(_this.point, baseEvent.point, nextEvent.point),
+                 cosine: cosineOfAngle(_this.point, baseEvent.point, nextEvent.point)
+               });
+             };
 
-               var enter = items.enter()
-                   .append('div')
-                   .attr('class', 'error-container');
-
-               enter
-                   .append('a')
-                   .attr('class', 'error-description')
-                   .attr('href', '#')
-                   .classed('hide-toggle', true)
-                   .text(function(d) { return d.msg || _t('save.unknown_error_details'); })
-                   .on('click', function() {
-                       event.preventDefault();
-
-                       var error = select(this);
-                       var detail = select(this.nextElementSibling);
-                       var exp = error.classed('expanded');
-
-                       detail.style('display', exp ? 'none' : 'block');
-                       error.classed('expanded', !exp);
-                   });
+             return function (a, b) {
+               if (!cache.has(a)) fillCache(a);
+               if (!cache.has(b)) fillCache(b);
 
-               var details = enter
-                   .append('div')
-                   .attr('class', 'error-detail-container')
-                   .style('display', 'none');
-
-               details
-                   .append('ul')
-                   .attr('class', 'error-detail-list')
-                   .selectAll('li')
-                   .data(function(d) { return d.details || []; })
-                   .enter()
-                   .append('li')
-                   .attr('class', 'error-detail-item')
-                   .text(function(d) { return d; });
+               var _cache$get = cache.get(a),
+                   asine = _cache$get.sine,
+                   acosine = _cache$get.cosine;
 
-               items.exit()
-                   .remove();
-           }
+               var _cache$get2 = cache.get(b),
+                   bsine = _cache$get2.sine,
+                   bcosine = _cache$get2.cosine; // both on or above x-axis
 
 
-           function showSuccess(changeset) {
-               commit.reset();
+               if (asine >= 0 && bsine >= 0) {
+                 if (acosine < bcosine) return 1;
+                 if (acosine > bcosine) return -1;
+                 return 0;
+               } // both below x-axis
 
-               var ui = _success
-                   .changeset(changeset)
-                   .location(_location)
-                   .on('cancel', function() { context.ui().sidebar.hide(); });
 
-               context.enter(modeBrowse(context).sidebar(ui));
-           }
+               if (asine < 0 && bsine < 0) {
+                 if (acosine < bcosine) return -1;
+                 if (acosine > bcosine) return 1;
+                 return 0;
+               } // one above x-axis, one below
 
 
-           function keybindingOn() {
-               select(document)
-                   .call(keybinding.on('⎋', cancel, true));
+               if (bsine < asine) return -1;
+               if (bsine > asine) return 1;
+               return 0;
+             };
            }
+         }]);
 
+         return SweepEvent;
+       }(); // segments and sweep events when all else is identical
 
-           function keybindingOff() {
-               select(document)
-                   .call(keybinding.unbind);
-           }
 
+       var segmentId = 0;
 
-           // Reverse geocode current map location so we can display a message on
-           // the success screen like "Thank you for editing around place, region."
-           function prepareForSuccess() {
-               _success = uiSuccess(context);
-               _location = null;
-               if (!services.geocoder) return;
+       var Segment = /*#__PURE__*/function () {
+         _createClass$1(Segment, null, [{
+           key: "compare",
 
-               services.geocoder.reverse(context.map().center(), function(err, result) {
-                   if (err || !result || !result.address) return;
+           /* This compare() function is for ordering segments in the sweep
+            * line tree, and does so according to the following criteria:
+            *
+            * Consider the vertical line that lies an infinestimal step to the
+            * right of the right-more of the two left endpoints of the input
+            * segments. Imagine slowly moving a point up from negative infinity
+            * in the increasing y direction. Which of the two segments will that
+            * point intersect first? That segment comes 'before' the other one.
+            *
+            * If neither segment would be intersected by such a line, (if one
+            * or more of the segments are vertical) then the line to be considered
+            * is directly on the right-more of the two left inputs.
+            */
+           value: function compare(a, b) {
+             var alx = a.leftSE.point.x;
+             var blx = b.leftSE.point.x;
+             var arx = a.rightSE.point.x;
+             var brx = b.rightSE.point.x; // check if they're even in the same vertical plane
+
+             if (brx < alx) return 1;
+             if (arx < blx) return -1;
+             var aly = a.leftSE.point.y;
+             var bly = b.leftSE.point.y;
+             var ary = a.rightSE.point.y;
+             var bry = b.rightSE.point.y; // is left endpoint of segment B the right-more?
+
+             if (alx < blx) {
+               // are the two segments in the same horizontal plane?
+               if (bly < aly && bly < ary) return 1;
+               if (bly > aly && bly > ary) return -1; // is the B left endpoint colinear to segment A?
+
+               var aCmpBLeft = a.comparePoint(b.leftSE.point);
+               if (aCmpBLeft < 0) return 1;
+               if (aCmpBLeft > 0) return -1; // is the A right endpoint colinear to segment B ?
+
+               var bCmpARight = b.comparePoint(a.rightSE.point);
+               if (bCmpARight !== 0) return bCmpARight; // colinear segments, consider the one with left-more
+               // left endpoint to be first (arbitrary?)
 
-                   var addr = result.address;
-                   var place = (addr && (addr.town || addr.city || addr.county)) || '';
-                   var region = (addr && (addr.state || addr.country)) || '';
-                   var separator = (place && region) ? _t('success.thank_you_where.separator') : '';
+               return -1;
+             } // is left endpoint of segment A the right-more?
 
-                   _location = _t('success.thank_you_where.format',
-                       { place: place, separator: separator, region: region }
-                   );
-               });
-           }
 
+             if (alx > blx) {
+               if (aly < bly && aly < bry) return -1;
+               if (aly > bly && aly > bry) return 1; // is the A left endpoint colinear to segment B?
 
-           mode.selectedIDs = function() {
-               return _conflictsUi ? _conflictsUi.shownEntityIds() : [];
-           };
+               var bCmpALeft = b.comparePoint(a.leftSE.point);
+               if (bCmpALeft !== 0) return bCmpALeft; // is the B right endpoint colinear to segment A?
 
+               var aCmpBRight = a.comparePoint(b.rightSE.point);
+               if (aCmpBRight < 0) return 1;
+               if (aCmpBRight > 0) return -1; // colinear segments, consider the one with left-more
+               // left endpoint to be first (arbitrary?)
 
-           mode.enter = function() {
-               // Show sidebar
-               context.ui().sidebar.expand();
+               return 1;
+             } // if we get here, the two left endpoints are in the same
+             // vertical plane, ie alx === blx
+             // consider the lower left-endpoint to come first
 
-               function done() {
-                   context.ui().sidebar.show(commit);
-               }
 
-               keybindingOn();
+             if (aly < bly) return -1;
+             if (aly > bly) return 1; // left endpoints are identical
+             // check for colinearity by using the left-more right endpoint
+             // is the A right endpoint more left-more?
 
-               context.container().selectAll('.main-content')
-                   .classed('active', false)
-                   .classed('inactive', true);
+             if (arx < brx) {
+               var _bCmpARight = b.comparePoint(a.rightSE.point);
 
-               var osm = context.connection();
-               if (!osm) {
-                   cancel();
-                   return;
-               }
+               if (_bCmpARight !== 0) return _bCmpARight;
+             } // is the B right endpoint more left-more?
 
-               if (osm.authenticated()) {
-                   done();
-               } else {
-                   osm.authenticate(function(err) {
-                       if (err) {
-                           cancel();
-                       } else {
-                           done();
-                       }
-                   });
-               }
-           };
 
+             if (arx > brx) {
+               var _aCmpBRight = a.comparePoint(b.rightSE.point);
 
-           mode.exit = function() {
+               if (_aCmpBRight < 0) return 1;
+               if (_aCmpBRight > 0) return -1;
+             }
 
-               keybindingOff();
+             if (arx !== brx) {
+               // are these two [almost] vertical segments with opposite orientation?
+               // if so, the one with the lower right endpoint comes first
+               var ay = ary - aly;
+               var ax = arx - alx;
+               var by = bry - bly;
+               var bx = brx - blx;
+               if (ay > ax && by < bx) return 1;
+               if (ay < ax && by > bx) return -1;
+             } // we have colinear segments with matching orientation
+             // consider the one with more left-more right endpoint to be first
 
-               context.container().selectAll('.main-content')
-                   .classed('active', true)
-                   .classed('inactive', false);
 
-               context.ui().sidebar.hide();
-           };
+             if (arx > brx) return 1;
+             if (arx < brx) return -1; // if we get here, two two right endpoints are in the same
+             // vertical plane, ie arx === brx
+             // consider the lower right-endpoint to come first
 
-           return mode;
-       }
+             if (ary < bry) return -1;
+             if (ary > bry) return 1; // right endpoints identical as well, so the segments are idential
+             // fall back on creation order as consistent tie-breaker
 
-       function uiToolOldDrawModes(context) {
+             if (a.id < b.id) return -1;
+             if (a.id > b.id) return 1; // identical segment, ie a === b
 
-           var tool = {
-               id: 'old_modes',
-               label: _t('toolbar.add_feature')
-           };
+             return 0;
+           }
+           /* Warning: a reference to ringWindings input will be stored,
+            *  and possibly will be later modified */
 
-           var modes = [
-               modeAddPoint(context, {
-                   title: _t('modes.add_point.title'),
-                   button: 'point',
-                   description: _t('modes.add_point.description'),
-                   preset: _mainPresetIndex.item('point'),
-                   key: '1'
-               }),
-               modeAddLine(context, {
-                   title: _t('modes.add_line.title'),
-                   button: 'line',
-                   description: _t('modes.add_line.description'),
-                   preset: _mainPresetIndex.item('line'),
-                   key: '2'
-               }),
-               modeAddArea(context, {
-                   title: _t('modes.add_area.title'),
-                   button: 'area',
-                   description: _t('modes.add_area.description'),
-                   preset: _mainPresetIndex.item('area'),
-                   key: '3'
-               })
-           ];
+         }]);
+
+         function Segment(leftSE, rightSE, rings, windings) {
+           _classCallCheck$1(this, Segment);
+
+           this.id = ++segmentId;
+           this.leftSE = leftSE;
+           leftSE.segment = this;
+           leftSE.otherSE = rightSE;
+           this.rightSE = rightSE;
+           rightSE.segment = this;
+           rightSE.otherSE = leftSE;
+           this.rings = rings;
+           this.windings = windings; // left unset for performance, set later in algorithm
+           // this.ringOut, this.consumedBy, this.prev
+         }
 
+         _createClass$1(Segment, [{
+           key: "replaceRightSE",
 
-           function enabled() {
-               return osmEditable();
+           /* When a segment is split, the rightSE is replaced with a new sweep event */
+           value: function replaceRightSE(newRightSE) {
+             this.rightSE = newRightSE;
+             this.rightSE.segment = this;
+             this.rightSE.otherSE = this.leftSE;
+             this.leftSE.otherSE = this.rightSE;
+           }
+         }, {
+           key: "bbox",
+           value: function bbox() {
+             var y1 = this.leftSE.point.y;
+             var y2 = this.rightSE.point.y;
+             return {
+               ll: {
+                 x: this.leftSE.point.x,
+                 y: y1 < y2 ? y1 : y2
+               },
+               ur: {
+                 x: this.rightSE.point.x,
+                 y: y1 > y2 ? y1 : y2
+               }
+             };
            }
+           /* A vector from the left point to the right */
 
-           function osmEditable() {
-               return context.editable();
+         }, {
+           key: "vector",
+           value: function vector() {
+             return {
+               x: this.rightSE.point.x - this.leftSE.point.x,
+               y: this.rightSE.point.y - this.leftSE.point.y
+             };
+           }
+         }, {
+           key: "isAnEndpoint",
+           value: function isAnEndpoint(pt) {
+             return pt.x === this.leftSE.point.x && pt.y === this.leftSE.point.y || pt.x === this.rightSE.point.x && pt.y === this.rightSE.point.y;
            }
+           /* Compare this segment with a point.
+            *
+            * A point P is considered to be colinear to a segment if there
+            * exists a distance D such that if we travel along the segment
+            * from one * endpoint towards the other a distance D, we find
+            * ourselves at point P.
+            *
+            * Return value indicates:
+            *
+            *   1: point lies above the segment (to the left of vertical)
+            *   0: point is colinear to segment
+            *  -1: point lies below the segment (to the right of vertical)
+            */
 
-           modes.forEach(function(mode) {
-               context.keybinding().on(mode.key, function() {
-                   if (!enabled()) return;
+         }, {
+           key: "comparePoint",
+           value: function comparePoint(point) {
+             if (this.isAnEndpoint(point)) return 0;
+             var lPt = this.leftSE.point;
+             var rPt = this.rightSE.point;
+             var v = this.vector(); // Exactly vertical segments.
+
+             if (lPt.x === rPt.x) {
+               if (point.x === lPt.x) return 0;
+               return point.x < lPt.x ? 1 : -1;
+             } // Nearly vertical segments with an intersection.
+             // Check to see where a point on the line with matching Y coordinate is.
+
+
+             var yDist = (point.y - lPt.y) / v.y;
+             var xFromYDist = lPt.x + yDist * v.x;
+             if (point.x === xFromYDist) return 0; // General case.
+             // Check to see where a point on the line with matching X coordinate is.
+
+             var xDist = (point.x - lPt.x) / v.x;
+             var yFromXDist = lPt.y + xDist * v.y;
+             if (point.y === yFromXDist) return 0;
+             return point.y < yFromXDist ? -1 : 1;
+           }
+           /**
+            * Given another segment, returns the first non-trivial intersection
+            * between the two segments (in terms of sweep line ordering), if it exists.
+            *
+            * A 'non-trivial' intersection is one that will cause one or both of the
+            * segments to be split(). As such, 'trivial' vs. 'non-trivial' intersection:
+            *
+            *   * endpoint of segA with endpoint of segB --> trivial
+            *   * endpoint of segA with point along segB --> non-trivial
+            *   * endpoint of segB with point along segA --> non-trivial
+            *   * point along segA with point along segB --> non-trivial
+            *
+            * If no non-trivial intersection exists, return null
+            * Else, return null.
+            */
 
-                   if (mode.id === context.mode().id) {
-                       context.enter(modeBrowse(context));
-                   } else {
-                       context.enter(mode);
-                   }
-               });
-           });
+         }, {
+           key: "getIntersection",
+           value: function getIntersection(other) {
+             // If bboxes don't overlap, there can't be any intersections
+             var tBbox = this.bbox();
+             var oBbox = other.bbox();
+             var bboxOverlap = getBboxOverlap(tBbox, oBbox);
+             if (bboxOverlap === null) return null; // We first check to see if the endpoints can be considered intersections.
+             // This will 'snap' intersections to endpoints if possible, and will
+             // handle cases of colinearity.
+
+             var tlp = this.leftSE.point;
+             var trp = this.rightSE.point;
+             var olp = other.leftSE.point;
+             var orp = other.rightSE.point; // does each endpoint touch the other segment?
+             // note that we restrict the 'touching' definition to only allow segments
+             // to touch endpoints that lie forward from where we are in the sweep line pass
+
+             var touchesOtherLSE = isInBbox(tBbox, olp) && this.comparePoint(olp) === 0;
+             var touchesThisLSE = isInBbox(oBbox, tlp) && other.comparePoint(tlp) === 0;
+             var touchesOtherRSE = isInBbox(tBbox, orp) && this.comparePoint(orp) === 0;
+             var touchesThisRSE = isInBbox(oBbox, trp) && other.comparePoint(trp) === 0; // do left endpoints match?
+
+             if (touchesThisLSE && touchesOtherLSE) {
+               // these two cases are for colinear segments with matching left
+               // endpoints, and one segment being longer than the other
+               if (touchesThisRSE && !touchesOtherRSE) return trp;
+               if (!touchesThisRSE && touchesOtherRSE) return orp; // either the two segments match exactly (two trival intersections)
+               // or just on their left endpoint (one trivial intersection
 
-           tool.render = function(selection) {
+               return null;
+             } // does this left endpoint matches (other doesn't)
 
-               var wrap = selection
-                   .append('div')
-                   .attr('class', 'joined')
-                   .style('display', 'flex');
 
-               var debouncedUpdate = debounce(update, 500, { leading: true, trailing: true });
+             if (touchesThisLSE) {
+               // check for segments that just intersect on opposing endpoints
+               if (touchesOtherRSE) {
+                 if (tlp.x === orp.x && tlp.y === orp.y) return null;
+               } // t-intersection on left endpoint
 
-               context.map()
-                   .on('move.modes', debouncedUpdate)
-                   .on('drawn.modes', debouncedUpdate);
 
-               context
-                   .on('enter.modes', update);
+               return tlp;
+             } // does other left endpoint matches (this doesn't)
 
-               update();
 
+             if (touchesOtherLSE) {
+               // check for segments that just intersect on opposing endpoints
+               if (touchesThisRSE) {
+                 if (trp.x === olp.x && trp.y === olp.y) return null;
+               } // t-intersection on left endpoint
 
-               function update() {
 
-                   var buttons = wrap.selectAll('button.add-button')
-                       .data(modes, function(d) { return d.id; });
+               return olp;
+             } // trivial intersection on right endpoints
 
-                   // exit
-                   buttons.exit()
-                       .remove();
 
-                   // enter
-                   var buttonsEnter = buttons.enter()
-                       .append('button')
-                       .attr('class', function(d) { return d.id + ' add-button bar-button'; })
-                       .on('click.mode-buttons', function(d) {
-                           if (!enabled()) return;
+             if (touchesThisRSE && touchesOtherRSE) return null; // t-intersections on just one right endpoint
 
-                           // When drawing, ignore accidental clicks on mode buttons - #4042
-                           var currMode = context.mode().id;
-                           if (/^draw/.test(currMode)) return;
+             if (touchesThisRSE) return trp;
+             if (touchesOtherRSE) return orp; // None of our endpoints intersect. Look for a general intersection between
+             // infinite lines laid over the segments
 
-                           if (d.id === currMode) {
-                               context.enter(modeBrowse(context));
-                           } else {
-                               context.enter(d);
-                           }
-                       })
-                       .call(uiTooltip()
-                           .placement('bottom')
-                           .title(function(d) { return d.description; })
-                           .keys(function(d) { return [d.key]; })
-                           .scrollContainer(context.container().select('.top-toolbar'))
-                       );
+             var pt = intersection$1(tlp, this.vector(), olp, other.vector()); // are the segments parrallel? Note that if they were colinear with overlap,
+             // they would have an endpoint intersection and that case was already handled above
 
-                   buttonsEnter
-                       .each(function(d) {
-                           select(this)
-                               .call(svgIcon('#iD-icon-' + d.button));
-                       });
+             if (pt === null) return null; // is the intersection found between the lines not on the segments?
 
-                   buttonsEnter
-                       .append('span')
-                       .attr('class', 'label')
-                       .text(function(mode) { return mode.title; });
+             if (!isInBbox(bboxOverlap, pt)) return null; // round the the computed point if needed
 
-                   // if we are adding/removing the buttons, check if toolbar has overflowed
-                   if (buttons.enter().size() || buttons.exit().size()) {
-                       context.ui().checkOverflow('.top-toolbar', true);
-                   }
+             return rounder.round(pt.x, pt.y);
+           }
+           /**
+            * Split the given segment into multiple segments on the given points.
+            *  * Each existing segment will retain its leftSE and a new rightSE will be
+            *    generated for it.
+            *  * A new segment will be generated which will adopt the original segment's
+            *    rightSE, and a new leftSE will be generated for it.
+            *  * If there are more than two points given to split on, new segments
+            *    in the middle will be generated with new leftSE and rightSE's.
+            *  * An array of the newly generated SweepEvents will be returned.
+            *
+            * Warning: input array of points is modified
+            */
 
-                   // update
-                   buttons = buttons
-                       .merge(buttonsEnter)
-                       .classed('disabled', function(d) { return !enabled(); })
-                       .classed('active', function(d) { return context.mode() && context.mode().button === d.button; });
-               }
-           };
+         }, {
+           key: "split",
+           value: function split(point) {
+             var newEvents = [];
+             var alreadyLinked = point.events !== undefined;
+             var newLeftSE = new SweepEvent$1(point, true);
+             var newRightSE = new SweepEvent$1(point, false);
+             var oldRightSE = this.rightSE;
+             this.replaceRightSE(newRightSE);
+             newEvents.push(newRightSE);
+             newEvents.push(newLeftSE);
+             var newSeg = new Segment(newLeftSE, oldRightSE, this.rings.slice(), this.windings.slice()); // when splitting a nearly vertical downward-facing segment,
+             // sometimes one of the resulting new segments is vertical, in which
+             // case its left and right events may need to be swapped
 
-           return tool;
-       }
+             if (SweepEvent$1.comparePoints(newSeg.leftSE.point, newSeg.rightSE.point) > 0) {
+               newSeg.swapEvents();
+             }
 
-       function uiToolNotes(context) {
+             if (SweepEvent$1.comparePoints(this.leftSE.point, this.rightSE.point) > 0) {
+               this.swapEvents();
+             } // in the point we just used to create new sweep events with was already
+             // linked to other events, we need to check if either of the affected
+             // segments should be consumed
 
-           var tool = {
-               id: 'notes',
-               label: _t('modes.add_note.label')
-           };
 
-           var mode = modeAddNote(context);
+             if (alreadyLinked) {
+               newLeftSE.checkForConsuming();
+               newRightSE.checkForConsuming();
+             }
 
-           function enabled() {
-               return notesEnabled() && notesEditable();
+             return newEvents;
            }
+           /* Swap which event is left and right */
 
-           function notesEnabled() {
-               var noteLayer = context.layers().layer('notes');
-               return noteLayer && noteLayer.enabled();
-           }
+         }, {
+           key: "swapEvents",
+           value: function swapEvents() {
+             var tmpEvt = this.rightSE;
+             this.rightSE = this.leftSE;
+             this.leftSE = tmpEvt;
+             this.leftSE.isLeft = true;
+             this.rightSE.isLeft = false;
 
-           function notesEditable() {
-               var mode = context.mode();
-               return context.map().notesEditable() && mode && mode.id !== 'save';
+             for (var i = 0, iMax = this.windings.length; i < iMax; i++) {
+               this.windings[i] *= -1;
+             }
            }
+           /* Consume another segment. We take their rings under our wing
+            * and mark them as consumed. Use for perfectly overlapping segments */
 
-           context.keybinding().on(mode.key, function() {
-               if (!enabled()) return;
+         }, {
+           key: "consume",
+           value: function consume(other) {
+             var consumer = this;
+             var consumee = other;
 
-               if (mode.id === context.mode().id) {
-                   context.enter(modeBrowse(context));
-               } else {
-                   context.enter(mode);
-               }
-           });
+             while (consumer.consumedBy) {
+               consumer = consumer.consumedBy;
+             }
+
+             while (consumee.consumedBy) {
+               consumee = consumee.consumedBy;
+             }
 
-           tool.render = function(selection) {
+             var cmp = Segment.compare(consumer, consumee);
+             if (cmp === 0) return; // already consumed
+             // the winner of the consumption is the earlier segment
+             // according to sweep line ordering
 
+             if (cmp > 0) {
+               var tmp = consumer;
+               consumer = consumee;
+               consumee = tmp;
+             } // make sure a segment doesn't consume it's prev
 
-               var debouncedUpdate = debounce(update, 500, { leading: true, trailing: true });
 
-               context.map()
-                   .on('move.notes', debouncedUpdate)
-                   .on('drawn.notes', debouncedUpdate);
+             if (consumer.prev === consumee) {
+               var _tmp = consumer;
+               consumer = consumee;
+               consumee = _tmp;
+             }
 
-               context
-                   .on('enter.notes', update);
+             for (var i = 0, iMax = consumee.rings.length; i < iMax; i++) {
+               var ring = consumee.rings[i];
+               var winding = consumee.windings[i];
+               var index = consumer.rings.indexOf(ring);
 
-               update();
+               if (index === -1) {
+                 consumer.rings.push(ring);
+                 consumer.windings.push(winding);
+               } else consumer.windings[index] += winding;
+             }
 
+             consumee.rings = null;
+             consumee.windings = null;
+             consumee.consumedBy = consumer; // mark sweep events consumed as to maintain ordering in sweep event queue
 
-               function update() {
-                   var showNotes = notesEnabled();
-                   var data = showNotes ? [mode] : [];
+             consumee.leftSE.consumedBy = consumer.leftSE;
+             consumee.rightSE.consumedBy = consumer.rightSE;
+           }
+           /* The first segment previous segment chain that is in the result */
+
+         }, {
+           key: "prevInResult",
+           value: function prevInResult() {
+             if (this._prevInResult !== undefined) return this._prevInResult;
+             if (!this.prev) this._prevInResult = null;else if (this.prev.isInResult()) this._prevInResult = this.prev;else this._prevInResult = this.prev.prevInResult();
+             return this._prevInResult;
+           }
+         }, {
+           key: "beforeState",
+           value: function beforeState() {
+             if (this._beforeState !== undefined) return this._beforeState;
+             if (!this.prev) this._beforeState = {
+               rings: [],
+               windings: [],
+               multiPolys: []
+             };else {
+               var seg = this.prev.consumedBy || this.prev;
+               this._beforeState = seg.afterState();
+             }
+             return this._beforeState;
+           }
+         }, {
+           key: "afterState",
+           value: function afterState() {
+             if (this._afterState !== undefined) return this._afterState;
+             var beforeState = this.beforeState();
+             this._afterState = {
+               rings: beforeState.rings.slice(0),
+               windings: beforeState.windings.slice(0),
+               multiPolys: []
+             };
+             var ringsAfter = this._afterState.rings;
+             var windingsAfter = this._afterState.windings;
+             var mpsAfter = this._afterState.multiPolys; // calculate ringsAfter, windingsAfter
 
-                   var buttons = selection.selectAll('button.add-button')
-                       .data(data, function(d) { return d.id; });
+             for (var i = 0, iMax = this.rings.length; i < iMax; i++) {
+               var ring = this.rings[i];
+               var winding = this.windings[i];
+               var index = ringsAfter.indexOf(ring);
 
-                   // exit
-                   buttons.exit()
-                       .remove();
+               if (index === -1) {
+                 ringsAfter.push(ring);
+                 windingsAfter.push(winding);
+               } else windingsAfter[index] += winding;
+             } // calcualte polysAfter
 
-                   // enter
-                   var buttonsEnter = buttons.enter()
-                       .append('button')
-                       .attr('tabindex', -1)
-                       .attr('class', function(d) { return d.id + ' add-button bar-button'; })
-                       .on('click.notes', function(d) {
-                           if (!enabled()) return;
 
-                           // When drawing, ignore accidental clicks on mode buttons - #4042
-                           var currMode = context.mode().id;
-                           if (/^draw/.test(currMode)) return;
+             var polysAfter = [];
+             var polysExclude = [];
 
-                           if (d.id === currMode) {
-                               context.enter(modeBrowse(context));
-                           } else {
-                               context.enter(d);
-                           }
-                       })
-                       .call(uiTooltip()
-                           .placement('bottom')
-                           .title(function(d) { return d.description; })
-                           .keys(function(d) { return [d.key]; })
-                           .scrollContainer(context.container().select('.top-toolbar'))
-                       );
+             for (var _i = 0, _iMax = ringsAfter.length; _i < _iMax; _i++) {
+               if (windingsAfter[_i] === 0) continue; // non-zero rule
 
-                   buttonsEnter
-                       .each(function(d) {
-                           select(this)
-                               .call(svgIcon(d.icon || '#iD-icon-' + d.button));
-                       });
+               var _ring = ringsAfter[_i];
+               var poly = _ring.poly;
+               if (polysExclude.indexOf(poly) !== -1) continue;
+               if (_ring.isExterior) polysAfter.push(poly);else {
+                 if (polysExclude.indexOf(poly) === -1) polysExclude.push(poly);
 
-                   // if we are adding/removing the buttons, check if toolbar has overflowed
-                   if (buttons.enter().size() || buttons.exit().size()) {
-                       context.ui().checkOverflow('.top-toolbar', true);
-                   }
+                 var _index = polysAfter.indexOf(_ring.poly);
 
-                   // update
-                   buttons = buttons
-                       .merge(buttonsEnter)
-                       .classed('disabled', function(d) { return !enabled(); })
-                       .classed('active', function(d) { return context.mode() && context.mode().button === d.button; });
+                 if (_index !== -1) polysAfter.splice(_index, 1);
                }
-           };
+             } // calculate multiPolysAfter
 
-           tool.uninstall = function() {
-               context
-                   .on('enter.editor.notes', null)
-                   .on('exit.editor.notes', null)
-                   .on('enter.notes', null);
 
-               context.map()
-                   .on('move.notes', null)
-                   .on('drawn.notes', null);
-           };
+             for (var _i2 = 0, _iMax2 = polysAfter.length; _i2 < _iMax2; _i2++) {
+               var mp = polysAfter[_i2].multiPoly;
+               if (mpsAfter.indexOf(mp) === -1) mpsAfter.push(mp);
+             }
 
-           return tool;
-       }
+             return this._afterState;
+           }
+           /* Is this segment part of the final result? */
 
-       function uiToolSave(context) {
+         }, {
+           key: "isInResult",
+           value: function isInResult() {
+             // if we've been consumed, we're not in the result
+             if (this.consumedBy) return false;
+             if (this._isInResult !== undefined) return this._isInResult;
+             var mpsBefore = this.beforeState().multiPolys;
+             var mpsAfter = this.afterState().multiPolys;
+
+             switch (operation.type) {
+               case 'union':
+                 {
+                   // UNION - included iff:
+                   //  * On one side of us there is 0 poly interiors AND
+                   //  * On the other side there is 1 or more.
+                   var noBefores = mpsBefore.length === 0;
+                   var noAfters = mpsAfter.length === 0;
+                   this._isInResult = noBefores !== noAfters;
+                   break;
+                 }
 
-           var tool = {
-               id: 'save',
-               label: _t('save.title')
-           };
+               case 'intersection':
+                 {
+                   // INTERSECTION - included iff:
+                   //  * on one side of us all multipolys are rep. with poly interiors AND
+                   //  * on the other side of us, not all multipolys are repsented
+                   //    with poly interiors
+                   var least;
+                   var most;
+
+                   if (mpsBefore.length < mpsAfter.length) {
+                     least = mpsBefore.length;
+                     most = mpsAfter.length;
+                   } else {
+                     least = mpsAfter.length;
+                     most = mpsBefore.length;
+                   }
 
-           var button = null;
-           var tooltipBehavior = null;
-           var history = context.history();
-           var key = uiCmd('⌘S');
-           var _numChanges = 0;
+                   this._isInResult = most === operation.numMultiPolys && least < most;
+                   break;
+                 }
 
-           function isSaving() {
-               var mode = context.mode();
-               return mode && mode.id === 'save';
+               case 'xor':
+                 {
+                   // XOR - included iff:
+                   //  * the difference between the number of multipolys represented
+                   //    with poly interiors on our two sides is an odd number
+                   var diff = Math.abs(mpsBefore.length - mpsAfter.length);
+                   this._isInResult = diff % 2 === 1;
+                   break;
+                 }
+
+               case 'difference':
+                 {
+                   // DIFFERENCE included iff:
+                   //  * on exactly one side, we have just the subject
+                   var isJustSubject = function isJustSubject(mps) {
+                     return mps.length === 1 && mps[0].isSubject;
+                   };
+
+                   this._isInResult = isJustSubject(mpsBefore) !== isJustSubject(mpsAfter);
+                   break;
+                 }
+
+               default:
+                 throw new Error("Unrecognized operation type found ".concat(operation.type));
+             }
+
+             return this._isInResult;
            }
+         }], [{
+           key: "fromRing",
+           value: function fromRing(pt1, pt2, ring) {
+             var leftPt, rightPt, winding; // ordering the two points according to sweep line ordering
+
+             var cmpPts = SweepEvent$1.comparePoints(pt1, pt2);
+
+             if (cmpPts < 0) {
+               leftPt = pt1;
+               rightPt = pt2;
+               winding = 1;
+             } else if (cmpPts > 0) {
+               leftPt = pt2;
+               rightPt = pt1;
+               winding = -1;
+             } else throw new Error("Tried to create degenerate segment at [".concat(pt1.x, ", ").concat(pt1.y, "]"));
 
-           function isDisabled() {
-               return _numChanges === 0 || isSaving();
+             var leftSE = new SweepEvent$1(leftPt, true);
+             var rightSE = new SweepEvent$1(rightPt, false);
+             return new Segment(leftSE, rightSE, [ring], [winding]);
            }
+         }]);
 
-           function save() {
-               event.preventDefault();
-               if (!context.inIntro() && !isSaving() && history.hasChanges()) {
-                   context.enter(modeSave(context));
-               }
+         return Segment;
+       }();
+
+       var RingIn = /*#__PURE__*/function () {
+         function RingIn(geomRing, poly, isExterior) {
+           _classCallCheck$1(this, RingIn);
+
+           if (!Array.isArray(geomRing) || geomRing.length === 0) {
+             throw new Error('Input geometry is not a valid Polygon or MultiPolygon');
            }
 
-           function bgColor() {
-               var step;
-               if (_numChanges === 0) {
-                   return null;
-               } else if (_numChanges <= 50) {
-                   step = _numChanges / 50;
-                   return d3_interpolateRgb('#fff', '#ff8')(step);  // white -> yellow
-               } else {
-                   step = Math.min((_numChanges - 50) / 50, 1.0);
-                   return d3_interpolateRgb('#ff8', '#f88')(step);  // yellow -> red
-               }
+           this.poly = poly;
+           this.isExterior = isExterior;
+           this.segments = [];
+
+           if (typeof geomRing[0][0] !== 'number' || typeof geomRing[0][1] !== 'number') {
+             throw new Error('Input geometry is not a valid Polygon or MultiPolygon');
            }
 
-           function updateCount() {
-               var val = history.difference().summary().length;
-               if (val === _numChanges) return;
+           var firstPoint = rounder.round(geomRing[0][0], geomRing[0][1]);
+           this.bbox = {
+             ll: {
+               x: firstPoint.x,
+               y: firstPoint.y
+             },
+             ur: {
+               x: firstPoint.x,
+               y: firstPoint.y
+             }
+           };
+           var prevPoint = firstPoint;
 
-               _numChanges = val;
+           for (var i = 1, iMax = geomRing.length; i < iMax; i++) {
+             if (typeof geomRing[i][0] !== 'number' || typeof geomRing[i][1] !== 'number') {
+               throw new Error('Input geometry is not a valid Polygon or MultiPolygon');
+             }
 
-               if (tooltipBehavior) {
-                   tooltipBehavior
-                       .title(_t(_numChanges > 0 ? 'save.help' : 'save.no_changes'))
-                       .keys([key]);
-               }
+             var point = rounder.round(geomRing[i][0], geomRing[i][1]); // skip repeated points
 
-               if (button) {
-                   button
-                       .classed('disabled', isDisabled())
-                       .style('background', bgColor());
+             if (point.x === prevPoint.x && point.y === prevPoint.y) continue;
+             this.segments.push(Segment.fromRing(prevPoint, point, this));
+             if (point.x < this.bbox.ll.x) this.bbox.ll.x = point.x;
+             if (point.y < this.bbox.ll.y) this.bbox.ll.y = point.y;
+             if (point.x > this.bbox.ur.x) this.bbox.ur.x = point.x;
+             if (point.y > this.bbox.ur.y) this.bbox.ur.y = point.y;
+             prevPoint = point;
+           } // add segment from last to first if last is not the same as first
 
-                   button.select('span.count')
-                       .text(_numChanges);
-               }
+
+           if (firstPoint.x !== prevPoint.x || firstPoint.y !== prevPoint.y) {
+             this.segments.push(Segment.fromRing(prevPoint, firstPoint, this));
            }
+         }
+
+         _createClass$1(RingIn, [{
+           key: "getSweepEvents",
+           value: function getSweepEvents() {
+             var sweepEvents = [];
 
+             for (var i = 0, iMax = this.segments.length; i < iMax; i++) {
+               var segment = this.segments[i];
+               sweepEvents.push(segment.leftSE);
+               sweepEvents.push(segment.rightSE);
+             }
 
-           tool.render = function(selection) {
-               tooltipBehavior = uiTooltip()
-                   .placement('bottom')
-                   .title(_t('save.no_changes'))
-                   .keys([key])
-                   .scrollContainer(context.container().select('.top-toolbar'));
+             return sweepEvents;
+           }
+         }]);
 
-               var lastPointerUpType;
+         return RingIn;
+       }();
 
-               button = selection
-                   .append('button')
-                   .attr('class', 'save disabled bar-button')
-                   .on('pointerup', function() {
-                       lastPointerUpType = event.pointerType;
-                   })
-                   .on('click', function() {
-                       event.preventDefault();
+       var PolyIn = /*#__PURE__*/function () {
+         function PolyIn(geomPoly, multiPoly) {
+           _classCallCheck$1(this, PolyIn);
 
-                       save();
+           if (!Array.isArray(geomPoly)) {
+             throw new Error('Input geometry is not a valid Polygon or MultiPolygon');
+           }
 
-                       if (_numChanges === 0 && (
-                           lastPointerUpType === 'touch' ||
-                           lastPointerUpType === 'pen')
-                       ) {
-                           // there are no tooltips for touch interactions so flash feedback instead
-                           context.ui().flash
-                               .duration(2000)
-                               .iconName('#iD-icon-save')
-                               .iconClass('disabled')
-                               .text(_t('save.no_changes'))();
-                       }
-                       lastPointerUpType = null;
-                   })
-                   .call(tooltipBehavior);
+           this.exteriorRing = new RingIn(geomPoly[0], this, true); // copy by value
 
-               button
-                   .call(svgIcon('#iD-icon-save'));
+           this.bbox = {
+             ll: {
+               x: this.exteriorRing.bbox.ll.x,
+               y: this.exteriorRing.bbox.ll.y
+             },
+             ur: {
+               x: this.exteriorRing.bbox.ur.x,
+               y: this.exteriorRing.bbox.ur.y
+             }
+           };
+           this.interiorRings = [];
+
+           for (var i = 1, iMax = geomPoly.length; i < iMax; i++) {
+             var ring = new RingIn(geomPoly[i], this, false);
+             if (ring.bbox.ll.x < this.bbox.ll.x) this.bbox.ll.x = ring.bbox.ll.x;
+             if (ring.bbox.ll.y < this.bbox.ll.y) this.bbox.ll.y = ring.bbox.ll.y;
+             if (ring.bbox.ur.x > this.bbox.ur.x) this.bbox.ur.x = ring.bbox.ur.x;
+             if (ring.bbox.ur.y > this.bbox.ur.y) this.bbox.ur.y = ring.bbox.ur.y;
+             this.interiorRings.push(ring);
+           }
+
+           this.multiPoly = multiPoly;
+         }
 
-               button
-                   .append('span')
-                   .attr('class', 'count')
-                   .attr('aria-hidden', 'true')
-                   .text('0');
+         _createClass$1(PolyIn, [{
+           key: "getSweepEvents",
+           value: function getSweepEvents() {
+             var sweepEvents = this.exteriorRing.getSweepEvents();
 
-               updateCount();
+             for (var i = 0, iMax = this.interiorRings.length; i < iMax; i++) {
+               var ringSweepEvents = this.interiorRings[i].getSweepEvents();
 
+               for (var j = 0, jMax = ringSweepEvents.length; j < jMax; j++) {
+                 sweepEvents.push(ringSweepEvents[j]);
+               }
+             }
 
-               context.keybinding()
-                   .on(key, save, true);
+             return sweepEvents;
+           }
+         }]);
 
+         return PolyIn;
+       }();
 
-               context.history()
-                   .on('change.save', updateCount);
+       var MultiPolyIn = /*#__PURE__*/function () {
+         function MultiPolyIn(geom, isSubject) {
+           _classCallCheck$1(this, MultiPolyIn);
 
-               context
-                   .on('enter.save', function() {
-                       if (button) {
-                           button
-                               .classed('disabled', isDisabled());
+           if (!Array.isArray(geom)) {
+             throw new Error('Input geometry is not a valid Polygon or MultiPolygon');
+           }
 
-                           if (isSaving()) {
-                               button.call(tooltipBehavior.hide);
-                           }
-                       }
-                   });
+           try {
+             // if the input looks like a polygon, convert it to a multipolygon
+             if (typeof geom[0][0][0] === 'number') geom = [geom];
+           } catch (ex) {// The input is either malformed or has empty arrays.
+             // In either case, it will be handled later on.
+           }
+
+           this.polys = [];
+           this.bbox = {
+             ll: {
+               x: Number.POSITIVE_INFINITY,
+               y: Number.POSITIVE_INFINITY
+             },
+             ur: {
+               x: Number.NEGATIVE_INFINITY,
+               y: Number.NEGATIVE_INFINITY
+             }
            };
 
+           for (var i = 0, iMax = geom.length; i < iMax; i++) {
+             var poly = new PolyIn(geom[i], this);
+             if (poly.bbox.ll.x < this.bbox.ll.x) this.bbox.ll.x = poly.bbox.ll.x;
+             if (poly.bbox.ll.y < this.bbox.ll.y) this.bbox.ll.y = poly.bbox.ll.y;
+             if (poly.bbox.ur.x > this.bbox.ur.x) this.bbox.ur.x = poly.bbox.ur.x;
+             if (poly.bbox.ur.y > this.bbox.ur.y) this.bbox.ur.y = poly.bbox.ur.y;
+             this.polys.push(poly);
+           }
 
-           tool.uninstall = function() {
-               context.keybinding()
-                   .off(key, true);
+           this.isSubject = isSubject;
+         }
 
-               context.history()
-                   .on('change.save', null);
+         _createClass$1(MultiPolyIn, [{
+           key: "getSweepEvents",
+           value: function getSweepEvents() {
+             var sweepEvents = [];
 
-               context
-                   .on('enter.save', null);
+             for (var i = 0, iMax = this.polys.length; i < iMax; i++) {
+               var polySweepEvents = this.polys[i].getSweepEvents();
 
-               button = null;
-               tooltipBehavior = null;
-           };
+               for (var j = 0, jMax = polySweepEvents.length; j < jMax; j++) {
+                 sweepEvents.push(polySweepEvents[j]);
+               }
+             }
 
-           return tool;
-       }
+             return sweepEvents;
+           }
+         }]);
 
-       function uiToolSidebarToggle(context) {
+         return MultiPolyIn;
+       }();
 
-           var tool = {
-               id: 'sidebar_toggle',
-               label: _t('toolbar.inspect')
-           };
+       var RingOut = /*#__PURE__*/function () {
+         _createClass$1(RingOut, null, [{
+           key: "factory",
 
-           tool.render = function(selection) {
-               selection
-                   .append('button')
-                   .attr('class', 'bar-button')
-                   .on('click', function() {
-                       context.ui().sidebar.toggle();
-                   })
-                   .call(uiTooltip()
-                       .placement('bottom')
-                       .title(_t('sidebar.tooltip'))
-                       .keys([_t('sidebar.key')])
-                       .scrollContainer(context.container().select('.top-toolbar'))
-                   )
-                   .call(svgIcon('#iD-icon-sidebar-' + (_mainLocalizer.textDirection() === 'rtl' ? 'right' : 'left')));
-           };
+           /* Given the segments from the sweep line pass, compute & return a series
+            * of closed rings from all the segments marked to be part of the result */
+           value: function factory(allSegments) {
+             var ringsOut = [];
 
-           return tool;
-       }
+             for (var i = 0, iMax = allSegments.length; i < iMax; i++) {
+               var segment = allSegments[i];
+               if (!segment.isInResult() || segment.ringOut) continue;
+               var prevEvent = null;
+               var event = segment.leftSE;
+               var nextEvent = segment.rightSE;
+               var events = [event];
+               var startingPoint = event.point;
+               var intersectionLEs = [];
+               /* Walk the chain of linked events to form a closed ring */
 
-       function uiToolUndoRedo(context) {
+               while (true) {
+                 prevEvent = event;
+                 event = nextEvent;
+                 events.push(event);
+                 /* Is the ring complete? */
 
-           var tool = {
-               id: 'undo_redo',
-               label: _t('toolbar.undo_redo')
-           };
+                 if (event.point === startingPoint) break;
 
-           var commands = [{
-               id: 'undo',
-               cmd: uiCmd('⌘Z'),
-               action: function() {
-                   context.undo();
-               },
-               annotation: function() {
-                   return context.history().undoAnnotation();
-               },
-               icon: 'iD-icon-' + (_mainLocalizer.textDirection() === 'rtl' ? 'redo' : 'undo')
-           }, {
-               id: 'redo',
-               cmd: uiCmd('⌘⇧Z'),
-               action: function() {
-                   context.redo();
-               },
-               annotation: function() {
-                   return context.history().redoAnnotation();
-               },
-               icon: 'iD-icon-' + (_mainLocalizer.textDirection() === 'rtl' ? 'undo' : 'redo')
-           }];
+                 while (true) {
+                   var availableLEs = event.getAvailableLinkedEvents();
+                   /* Did we hit a dead end? This shouldn't happen. Indicates some earlier
+                    * part of the algorithm malfunctioned... please file a bug report. */
 
+                   if (availableLEs.length === 0) {
+                     var firstPt = events[0].point;
+                     var lastPt = events[events.length - 1].point;
+                     throw new Error("Unable to complete output ring starting at [".concat(firstPt.x, ",") + " ".concat(firstPt.y, "]. Last matching segment found ends at") + " [".concat(lastPt.x, ", ").concat(lastPt.y, "]."));
+                   }
+                   /* Only one way to go, so cotinue on the path */
 
-           function editable() {
-               return context.mode() && context.mode().id !== 'save' && context.map().editableDataEnabled(true /* ignore min zoom */);
-           }
 
+                   if (availableLEs.length === 1) {
+                     nextEvent = availableLEs[0].otherSE;
+                     break;
+                   }
+                   /* We must have an intersection. Check for a completed loop */
 
-           tool.render = function(selection) {
-               var tooltipBehavior = uiTooltip()
-                   .placement('bottom')
-                   .title(function (d) {
-                       return d.annotation() ?
-                           _t(d.id + '.tooltip', { action: d.annotation() }) :
-                           _t(d.id + '.nothing');
-                   })
-                   .keys(function(d) {
-                       return [d.cmd];
-                   })
-                   .scrollContainer(context.container().select('.top-toolbar'));
 
-               var lastPointerUpType;
+                   var indexLE = null;
 
-               var buttons = selection.selectAll('button')
-                   .data(commands)
-                   .enter()
-                   .append('button')
-                   .attr('class', function(d) { return 'disabled ' + d.id + '-button bar-button'; })
-                   .on('pointerup', function() {
-                       // `pointerup` is always called before `click`
-                       lastPointerUpType = event.pointerType;
-                   })
-                   .on('click', function(d) {
-                       event.preventDefault();
-
-                       var annotation = d.annotation();
-
-                       if (editable() && annotation) {
-                           d.action();
-                       }
+                   for (var j = 0, jMax = intersectionLEs.length; j < jMax; j++) {
+                     if (intersectionLEs[j].point === event.point) {
+                       indexLE = j;
+                       break;
+                     }
+                   }
+                   /* Found a completed loop. Cut that off and make a ring */
 
-                       if (editable() && (
-                           lastPointerUpType === 'touch' ||
-                           lastPointerUpType === 'pen')
-                       ) {
-                           // there are no tooltips for touch interactions so flash feedback instead
-
-                           var text = annotation ?
-                               _t(d.id + '.tooltip', { action: annotation }) :
-                               _t(d.id + '.nothing');
-                           context.ui().flash
-                               .duration(2000)
-                               .iconName('#' + d.icon)
-                               .iconClass(annotation ? '' : 'disabled')
-                               .text(text)();
-                       }
-                       lastPointerUpType = null;
-                   })
-                   .call(tooltipBehavior);
 
-               buttons.each(function(d) {
-                   select(this)
-                       .call(svgIcon('#' + d.icon));
-               });
+                   if (indexLE !== null) {
+                     var intersectionLE = intersectionLEs.splice(indexLE)[0];
+                     var ringEvents = events.splice(intersectionLE.index);
+                     ringEvents.unshift(ringEvents[0].otherSE);
+                     ringsOut.push(new RingOut(ringEvents.reverse()));
+                     continue;
+                   }
+                   /* register the intersection */
 
-               context.keybinding()
-                   .on(commands[0].cmd, function() {
-                       event.preventDefault();
-                       if (editable()) commands[0].action();
-                   })
-                   .on(commands[1].cmd, function() {
-                       event.preventDefault();
-                       if (editable()) commands[1].action();
+
+                   intersectionLEs.push({
+                     index: events.length,
+                     point: event.point
                    });
+                   /* Choose the left-most option to continue the walk */
 
+                   var comparator = event.getLeftmostComparator(prevEvent);
+                   nextEvent = availableLEs.sort(comparator)[0].otherSE;
+                   break;
+                 }
+               }
 
-               var debouncedUpdate = debounce(update, 500, { leading: true, trailing: true });
+               ringsOut.push(new RingOut(events));
+             }
 
-               context.map()
-                   .on('move.undo_redo', debouncedUpdate)
-                   .on('drawn.undo_redo', debouncedUpdate);
+             return ringsOut;
+           }
+         }]);
 
-               context.history()
-                   .on('change.undo_redo', function(difference) {
-                       if (difference) update();
-                   });
+         function RingOut(events) {
+           _classCallCheck$1(this, RingOut);
 
-               context
-                   .on('enter.undo_redo', update);
+           this.events = events;
 
+           for (var i = 0, iMax = events.length; i < iMax; i++) {
+             events[i].segment.ringOut = this;
+           }
 
-               function update() {
-                   buttons
-                       .classed('disabled', function(d) {
-                           return !editable() || !d.annotation();
-                       })
-                       .each(function() {
-                           var selection = select(this);
-                           if (!selection.select('.tooltip.in').empty()) {
-                               selection.call(tooltipBehavior.updateContent);
-                           }
-                       });
-               }
-           };
+           this.poly = null;
+         }
+
+         _createClass$1(RingOut, [{
+           key: "getGeom",
+           value: function getGeom() {
+             // Remove superfluous points (ie extra points along a straight line),
+             var prevPt = this.events[0].point;
+             var points = [prevPt];
+
+             for (var i = 1, iMax = this.events.length - 1; i < iMax; i++) {
+               var _pt = this.events[i].point;
+               var _nextPt = this.events[i + 1].point;
+               if (compareVectorAngles(_pt, prevPt, _nextPt) === 0) continue;
+               points.push(_pt);
+               prevPt = _pt;
+             } // ring was all (within rounding error of angle calc) colinear points
+
+
+             if (points.length === 1) return null; // check if the starting point is necessary
+
+             var pt = points[0];
+             var nextPt = points[1];
+             if (compareVectorAngles(pt, prevPt, nextPt) === 0) points.shift();
+             points.push(points[0]);
+             var step = this.isExteriorRing() ? 1 : -1;
+             var iStart = this.isExteriorRing() ? 0 : points.length - 1;
+             var iEnd = this.isExteriorRing() ? points.length : -1;
+             var orderedPoints = [];
+
+             for (var _i = iStart; _i != iEnd; _i += step) {
+               orderedPoints.push([points[_i].x, points[_i].y]);
+             }
+
+             return orderedPoints;
+           }
+         }, {
+           key: "isExteriorRing",
+           value: function isExteriorRing() {
+             if (this._isExteriorRing === undefined) {
+               var enclosing = this.enclosingRing();
+               this._isExteriorRing = enclosing ? !enclosing.isExteriorRing() : true;
+             }
+
+             return this._isExteriorRing;
+           }
+         }, {
+           key: "enclosingRing",
+           value: function enclosingRing() {
+             if (this._enclosingRing === undefined) {
+               this._enclosingRing = this._calcEnclosingRing();
+             }
+
+             return this._enclosingRing;
+           }
+           /* Returns the ring that encloses this one, if any */
 
-           tool.uninstall = function() {
-               context.keybinding()
-                   .off(commands[0].cmd)
-                   .off(commands[1].cmd);
+         }, {
+           key: "_calcEnclosingRing",
+           value: function _calcEnclosingRing() {
+             // start with the ealier sweep line event so that the prevSeg
+             // chain doesn't lead us inside of a loop of ours
+             var leftMostEvt = this.events[0];
 
-               context.map()
-                   .on('move.undo_redo', null)
-                   .on('drawn.undo_redo', null);
+             for (var i = 1, iMax = this.events.length; i < iMax; i++) {
+               var evt = this.events[i];
+               if (SweepEvent$1.compare(leftMostEvt, evt) > 0) leftMostEvt = evt;
+             }
 
-               context.history()
-                   .on('change.undo_redo', null);
+             var prevSeg = leftMostEvt.segment.prevInResult();
+             var prevPrevSeg = prevSeg ? prevSeg.prevInResult() : null;
 
-               context
-                   .on('enter.undo_redo', null);
-           };
+             while (true) {
+               // no segment found, thus no ring can enclose us
+               if (!prevSeg) return null; // no segments below prev segment found, thus the ring of the prev
+               // segment must loop back around and enclose us
 
-           return tool;
-       }
+               if (!prevPrevSeg) return prevSeg.ringOut; // if the two segments are of different rings, the ring of the prev
+               // segment must either loop around us or the ring of the prev prev
+               // seg, which would make us and the ring of the prev peers
 
-       function uiTopToolbar(context) {
+               if (prevPrevSeg.ringOut !== prevSeg.ringOut) {
+                 if (prevPrevSeg.ringOut.enclosingRing() !== prevSeg.ringOut) {
+                   return prevSeg.ringOut;
+                 } else return prevSeg.ringOut.enclosingRing();
+               } // two segments are from the same ring, so this was a penisula
+               // of that ring. iterate downward, keep searching
 
-           var sidebarToggle = uiToolSidebarToggle(context),
-               modes = uiToolOldDrawModes(context),
-               notes = uiToolNotes(context),
-               undoRedo = uiToolUndoRedo(context),
-               save = uiToolSave(context);
 
-           function notesEnabled() {
-               var noteLayer = context.layers().layer('notes');
-               return noteLayer && noteLayer.enabled();
+               prevSeg = prevPrevSeg.prevInResult();
+               prevPrevSeg = prevSeg ? prevSeg.prevInResult() : null;
+             }
            }
+         }]);
 
-           function topToolbar(bar) {
+         return RingOut;
+       }();
 
-               bar.on('wheel.topToolbar', function() {
-                   if (!event.deltaX) {
-                       // translate vertical scrolling into horizontal scrolling in case
-                       // the user doesn't have an input device that can scroll horizontally
-                       bar.node().scrollLeft += event.deltaY;
-                   }
-               });
+       var PolyOut = /*#__PURE__*/function () {
+         function PolyOut(exteriorRing) {
+           _classCallCheck$1(this, PolyOut);
+
+           this.exteriorRing = exteriorRing;
+           exteriorRing.poly = this;
+           this.interiorRings = [];
+         }
 
-               var debouncedUpdate = debounce(update, 500, { leading: true, trailing: true });
-               context.layers()
-                   .on('change.topToolbar', debouncedUpdate);
+         _createClass$1(PolyOut, [{
+           key: "addInterior",
+           value: function addInterior(ring) {
+             this.interiorRings.push(ring);
+             ring.poly = this;
+           }
+         }, {
+           key: "getGeom",
+           value: function getGeom() {
+             var geom = [this.exteriorRing.getGeom()]; // exterior ring was all (within rounding error of angle calc) colinear points
 
-               update();
+             if (geom[0] === null) return null;
 
-               function update() {
+             for (var i = 0, iMax = this.interiorRings.length; i < iMax; i++) {
+               var ringGeom = this.interiorRings[i].getGeom(); // interior ring was all (within rounding error of angle calc) colinear points
 
-                   var tools = [
-                       sidebarToggle,
-                       'spacer',
-                       modes
-                   ];
+               if (ringGeom === null) continue;
+               geom.push(ringGeom);
+             }
 
-                   tools.push('spacer');
+             return geom;
+           }
+         }]);
 
-                   if (notesEnabled()) {
-                       tools = tools.concat([notes, 'spacer']);
-                   }
+         return PolyOut;
+       }();
 
-                   tools = tools.concat([undoRedo, save]);
+       var MultiPolyOut = /*#__PURE__*/function () {
+         function MultiPolyOut(rings) {
+           _classCallCheck$1(this, MultiPolyOut);
 
-                   var toolbarItems = bar.selectAll('.toolbar-item')
-                       .data(tools, function(d) {
-                           return d.id || d;
-                       });
+           this.rings = rings;
+           this.polys = this._composePolys(rings);
+         }
 
-                   toolbarItems.exit()
-                       .each(function(d) {
-                           if (d.uninstall) {
-                               d.uninstall();
-                           }
-                       })
-                       .remove();
-
-                   var itemsEnter = toolbarItems
-                       .enter()
-                       .append('div')
-                       .attr('class', function(d) {
-                           var classes = 'toolbar-item ' + (d.id || d).replace('_', '-');
-                           if (d.klass) classes += ' ' + d.klass;
-                           return classes;
-                       });
+         _createClass$1(MultiPolyOut, [{
+           key: "getGeom",
+           value: function getGeom() {
+             var geom = [];
 
-                   var actionableItems = itemsEnter.filter(function(d) { return d !== 'spacer'; });
+             for (var i = 0, iMax = this.polys.length; i < iMax; i++) {
+               var polyGeom = this.polys[i].getGeom(); // exterior ring was all (within rounding error of angle calc) colinear points
 
-                   actionableItems
-                       .append('div')
-                       .attr('class', 'item-content')
-                       .each(function(d) {
-                           select(this).call(d.render, bar);
-                       });
+               if (polyGeom === null) continue;
+               geom.push(polyGeom);
+             }
 
-                   actionableItems
-                       .append('div')
-                       .attr('class', 'item-label')
-                       .text(function(d) {
-                           return d.label;
-                       });
+             return geom;
+           }
+         }, {
+           key: "_composePolys",
+           value: function _composePolys(rings) {
+             var polys = [];
+
+             for (var i = 0, iMax = rings.length; i < iMax; i++) {
+               var ring = rings[i];
+               if (ring.poly) continue;
+               if (ring.isExteriorRing()) polys.push(new PolyOut(ring));else {
+                 var enclosingRing = ring.enclosingRing();
+                 if (!enclosingRing.poly) polys.push(new PolyOut(enclosingRing));
+                 enclosingRing.poly.addInterior(ring);
                }
+             }
 
+             return polys;
            }
+         }]);
 
-           return topToolbar;
-       }
+         return MultiPolyOut;
+       }();
+       /**
+        * NOTE:  We must be careful not to change any segments while
+        *        they are in the SplayTree. AFAIK, there's no way to tell
+        *        the tree to rebalance itself - thus before splitting
+        *        a segment that's in the tree, we remove it from the tree,
+        *        do the split, then re-insert it. (Even though splitting a
+        *        segment *shouldn't* change its correct position in the
+        *        sweep line tree, the reality is because of rounding errors,
+        *        it sometimes does.)
+        */
 
-       // these are module variables so they are preserved through a ui.restart()
-       var sawVersion = null;
-       var isNewVersion = false;
-       var isNewUser = false;
 
+       var SweepLine = /*#__PURE__*/function () {
+         function SweepLine(queue) {
+           var comparator = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : Segment.compare;
 
-       function uiVersion(context) {
+           _classCallCheck$1(this, SweepLine);
 
-           var currVersion = context.version;
-           var matchedVersion = currVersion.match(/\d+\.\d+\.\d+.*/);
+           this.queue = queue;
+           this.tree = new Tree(comparator);
+           this.segments = [];
+         }
 
-           if (sawVersion === null && matchedVersion !== null) {
-               if (corePreferences('sawVersion')) {
-                   isNewUser = false;
-                   isNewVersion = corePreferences('sawVersion') !== currVersion && currVersion.indexOf('-') === -1;
-               } else {
-                   isNewUser = true;
-                   isNewVersion = true;
-               }
-               corePreferences('sawVersion', currVersion);
-               sawVersion = currVersion;
-           }
-
-           return function(selection) {
-               selection
-                   .append('a')
-                   .attr('target', '_blank')
-                   .attr('href', 'https://github.com/openstreetmap/iD')
-                   .text(currVersion);
-
-               // only show new version indicator to users that have used iD before
-               if (isNewVersion && !isNewUser) {
-                   selection
-                       .append('div')
-                       .attr('class', 'badge')
-                       .append('a')
-                       .attr('target', '_blank')
-                       .attr('href', 'https://github.com/openstreetmap/iD/blob/release/CHANGELOG.md#whats-new')
-                       .call(svgIcon('#maki-gift-11'))
-                       .call(uiTooltip()
-                           .title(_t('version.whats_new', { version: currVersion }))
-                           .placement('top')
-                       );
-               }
-           };
-       }
+         _createClass$1(SweepLine, [{
+           key: "process",
+           value: function process(event) {
+             var segment = event.segment;
+             var newEvents = []; // if we've already been consumed by another segment,
+             // clean up our body parts and get out
 
-       function uiZoom(context) {
+             if (event.consumedBy) {
+               if (event.isLeft) this.queue.remove(event.otherSE);else this.tree.remove(segment);
+               return newEvents;
+             }
 
-           var zooms = [{
-               id: 'zoom-in',
-               icon: 'iD-icon-plus',
-               title: _t('zoom.in'),
-               action: zoomIn,
-               disabled: function() {
-                   return !context.map().canZoomIn();
-               },
-               disabledTitle: _t('zoom.disabled.in'),
-               key: '+'
-           }, {
-               id: 'zoom-out',
-               icon: 'iD-icon-minus',
-               title: _t('zoom.out'),
-               action: zoomOut,
-               disabled: function() {
-                   return !context.map().canZoomOut();
-               },
-               disabledTitle: _t('zoom.disabled.out'),
-               key: '-'
-           }];
+             var node = event.isLeft ? this.tree.insert(segment) : this.tree.find(segment);
+             if (!node) throw new Error("Unable to find segment #".concat(segment.id, " ") + "[".concat(segment.leftSE.point.x, ", ").concat(segment.leftSE.point.y, "] -> ") + "[".concat(segment.rightSE.point.x, ", ").concat(segment.rightSE.point.y, "] ") + 'in SweepLine tree. Please submit a bug report.');
+             var prevNode = node;
+             var nextNode = node;
+             var prevSeg = undefined;
+             var nextSeg = undefined; // skip consumed segments still in tree
 
-           function zoomIn() {
-               event.preventDefault();
-               context.map().zoomIn();
-           }
+             while (prevSeg === undefined) {
+               prevNode = this.tree.prev(prevNode);
+               if (prevNode === null) prevSeg = null;else if (prevNode.key.consumedBy === undefined) prevSeg = prevNode.key;
+             } // skip consumed segments still in tree
 
-           function zoomOut() {
-               event.preventDefault();
-               context.map().zoomOut();
-           }
 
-           function zoomInFurther() {
-               event.preventDefault();
-               context.map().zoomInFurther();
-           }
+             while (nextSeg === undefined) {
+               nextNode = this.tree.next(nextNode);
+               if (nextNode === null) nextSeg = null;else if (nextNode.key.consumedBy === undefined) nextSeg = nextNode.key;
+             }
 
-           function zoomOutFurther() {
-               event.preventDefault();
-               context.map().zoomOutFurther();
-           }
+             if (event.isLeft) {
+               // Check for intersections against the previous segment in the sweep line
+               var prevMySplitter = null;
 
-           return function(selection) {
-               var tooltipBehavior = uiTooltip()
-                   .placement((_mainLocalizer.textDirection() === 'rtl') ? 'right' : 'left')
-                   .title(function(d) {
-                       if (d.disabled()) {
-                           return d.disabledTitle;
-                       }
-                       return d.title;
-                   })
-                   .keys(function(d) {
-                       return [d.key];
-                   });
+               if (prevSeg) {
+                 var prevInter = prevSeg.getIntersection(segment);
 
-               var lastPointerUpType;
+                 if (prevInter !== null) {
+                   if (!segment.isAnEndpoint(prevInter)) prevMySplitter = prevInter;
 
-               var buttons = selection.selectAll('button')
-                   .data(zooms)
-                   .enter()
-                   .append('button')
-                   .attr('class', function(d) { return d.id; })
-                   .on('pointerup.editor', function() {
-                       lastPointerUpType = event.pointerType;
-                   })
-                   .on('click.editor', function(d) {
-                       if (!d.disabled()) {
-                           d.action();
-                       } else if (lastPointerUpType === 'touch' || lastPointerUpType === 'pen') {
-                           context.ui().flash
-                               .duration(2000)
-                               .iconName('#' + d.icon)
-                               .iconClass('disabled')
-                               .text(d.disabledTitle)();
-                       }
-                       lastPointerUpType = null;
-                   })
-                   .call(tooltipBehavior);
+                   if (!prevSeg.isAnEndpoint(prevInter)) {
+                     var newEventsFromSplit = this._splitSafely(prevSeg, prevInter);
 
-               buttons.each(function(d) {
-                   select(this)
-                       .call(svgIcon('#' + d.icon, 'light'));
-               });
+                     for (var i = 0, iMax = newEventsFromSplit.length; i < iMax; i++) {
+                       newEvents.push(newEventsFromSplit[i]);
+                     }
+                   }
+                 }
+               } // Check for intersections against the next segment in the sweep line
 
-               ['plus', 'ffplus', '=', 'ffequals'].forEach(function(key) {
-                   context.keybinding().on([key], zoomIn);
-                   context.keybinding().on([uiCmd('⌘' + key)], zoomInFurther);
-               });
 
-               ['_', '-', 'ffminus', 'dash'].forEach(function(key) {
-                   context.keybinding().on([key], zoomOut);
-                   context.keybinding().on([uiCmd('⌘' + key)], zoomOutFurther);
-               });
+               var nextMySplitter = null;
 
-               function updateButtonStates() {
-                   buttons
-                       .classed('disabled', function(d) {
-                           return d.disabled();
-                       })
-                       .each(function() {
-                           var selection = select(this);
-                           if (!selection.select('.tooltip.in').empty()) {
-                               selection.call(tooltipBehavior.updateContent);
-                           }
-                       });
-               }
+               if (nextSeg) {
+                 var nextInter = nextSeg.getIntersection(segment);
 
-               updateButtonStates();
+                 if (nextInter !== null) {
+                   if (!segment.isAnEndpoint(nextInter)) nextMySplitter = nextInter;
 
-               context.map().on('move.uiZoom', updateButtonStates);
-           };
-       }
+                   if (!nextSeg.isAnEndpoint(nextInter)) {
+                     var _newEventsFromSplit = this._splitSafely(nextSeg, nextInter);
 
-       function uiZoomToSelection(context) {
+                     for (var _i = 0, _iMax = _newEventsFromSplit.length; _i < _iMax; _i++) {
+                       newEvents.push(_newEventsFromSplit[_i]);
+                     }
+                   }
+                 }
+               } // For simplicity, even if we find more than one intersection we only
+               // spilt on the 'earliest' (sweep-line style) of the intersections.
+               // The other intersection will be handled in a future process().
 
-           function isDisabled() {
-               var mode = context.mode();
-               return !mode || !mode.zoomToSelected;
-           }
 
-           var _lastPointerUpType;
+               if (prevMySplitter !== null || nextMySplitter !== null) {
+                 var mySplitter = null;
+                 if (prevMySplitter === null) mySplitter = nextMySplitter;else if (nextMySplitter === null) mySplitter = prevMySplitter;else {
+                   var cmpSplitters = SweepEvent$1.comparePoints(prevMySplitter, nextMySplitter);
+                   mySplitter = cmpSplitters <= 0 ? prevMySplitter : nextMySplitter;
+                 } // Rounding errors can cause changes in ordering,
+                 // so remove afected segments and right sweep events before splitting
 
-           function pointerup() {
-               _lastPointerUpType = event.pointerType;
-           }
+                 this.queue.remove(segment.rightSE);
+                 newEvents.push(segment.rightSE);
 
-           function click() {
-               event.preventDefault();
+                 var _newEventsFromSplit2 = segment.split(mySplitter);
 
-               if (isDisabled()) {
-                   if (_lastPointerUpType === 'touch' || _lastPointerUpType === 'pen') {
-                       context.ui().flash
-                           .duration(2000)
-                           .iconName('#iD-icon-framed-dot')
-                           .iconClass('disabled')
-                           .text(_t('inspector.zoom_to.no_selection'))();
-                   }
-               } else {
-                   var mode = context.mode();
-                   if (mode && mode.zoomToSelected) {
-                       mode.zoomToSelected();
-                   }
+                 for (var _i2 = 0, _iMax2 = _newEventsFromSplit2.length; _i2 < _iMax2; _i2++) {
+                   newEvents.push(_newEventsFromSplit2[_i2]);
+                 }
                }
 
-               _lastPointerUpType = null;
-           }
+               if (newEvents.length > 0) {
+                 // We found some intersections, so re-do the current event to
+                 // make sure sweep line ordering is totally consistent for later
+                 // use with the segment 'prev' pointers
+                 this.tree.remove(segment);
+                 newEvents.push(event);
+               } else {
+                 // done with left event
+                 this.segments.push(segment);
+                 segment.prev = prevSeg;
+               }
+             } else {
+               // event.isRight
+               // since we're about to be removed from the sweep line, check for
+               // intersections between our previous and next segments
+               if (prevSeg && nextSeg) {
+                 var inter = prevSeg.getIntersection(nextSeg);
+
+                 if (inter !== null) {
+                   if (!prevSeg.isAnEndpoint(inter)) {
+                     var _newEventsFromSplit3 = this._splitSafely(prevSeg, inter);
+
+                     for (var _i3 = 0, _iMax3 = _newEventsFromSplit3.length; _i3 < _iMax3; _i3++) {
+                       newEvents.push(_newEventsFromSplit3[_i3]);
+                     }
+                   }
 
-           return function(selection) {
+                   if (!nextSeg.isAnEndpoint(inter)) {
+                     var _newEventsFromSplit4 = this._splitSafely(nextSeg, inter);
 
-               var tooltipBehavior = uiTooltip()
-                   .placement((_mainLocalizer.textDirection() === 'rtl') ? 'right' : 'left')
-                   .title(function() {
-                       if (isDisabled()) {
-                           return _t('inspector.zoom_to.no_selection');
-                       }
-                       return _t('inspector.zoom_to.title');
-                   })
-                   .keys([_t('inspector.zoom_to.key')]);
-
-               var button = selection
-                   .append('button')
-                   .on('pointerup', pointerup)
-                   .on('click', click)
-                   .call(svgIcon('#iD-icon-framed-dot', 'light'))
-                   .call(tooltipBehavior);
-
-               function setEnabledState() {
-                   button.classed('disabled', isDisabled());
-                   if (!button.select('.tooltip.in').empty()) {
-                       button.call(tooltipBehavior.updateContent);
+                     for (var _i4 = 0, _iMax4 = _newEventsFromSplit4.length; _i4 < _iMax4; _i4++) {
+                       newEvents.push(_newEventsFromSplit4[_i4]);
+                     }
                    }
+                 }
                }
 
-               context.on('enter.uiZoomToSelection', setEnabledState);
-
-               setEnabledState();
-           };
-       }
+               this.tree.remove(segment);
+             }
 
-       function uiPane(id, context) {
+             return newEvents;
+           }
+           /* Safely split a segment that is currently in the datastructures
+            * IE - a segment other than the one that is currently being processed. */
 
-           var _key;
-           var _title = '';
-           var _description = '';
-           var _iconName = '';
-           var _sections; // array of uiSection objects
+         }, {
+           key: "_splitSafely",
+           value: function _splitSafely(seg, pt) {
+             // Rounding errors can cause changes in ordering,
+             // so remove afected segments and right sweep events before splitting
+             // removeNode() doesn't work, so have re-find the seg
+             // https://github.com/w8r/splay-tree/pull/5
+             this.tree.remove(seg);
+             var rightSE = seg.rightSE;
+             this.queue.remove(rightSE);
+             var newEvents = seg.split(pt);
+             newEvents.push(rightSE); // splitting can trigger consumption
 
-           var _paneSelection = select(null);
+             if (seg.consumedBy === undefined) this.tree.insert(seg);
+             return newEvents;
+           }
+         }]);
 
-           var _paneTooltip;
+         return SweepLine;
+       }();
 
-           var pane = {
-               id: id
-           };
+       var POLYGON_CLIPPING_MAX_QUEUE_SIZE = typeof process !== 'undefined' && process.env.POLYGON_CLIPPING_MAX_QUEUE_SIZE || 1000000;
+       var POLYGON_CLIPPING_MAX_SWEEPLINE_SEGMENTS = typeof process !== 'undefined' && process.env.POLYGON_CLIPPING_MAX_SWEEPLINE_SEGMENTS || 1000000;
 
-           pane.title = function(val) {
-               if (!arguments.length) return _title;
-               _title = val;
-               return pane;
-           };
+       var Operation = /*#__PURE__*/function () {
+         function Operation() {
+           _classCallCheck$1(this, Operation);
+         }
 
-           pane.key = function(val) {
-               if (!arguments.length) return _key;
-               _key = val;
-               return pane;
-           };
+         _createClass$1(Operation, [{
+           key: "run",
+           value: function run(type, geom, moreGeoms) {
+             operation.type = type;
+             rounder.reset();
+             /* Convert inputs to MultiPoly objects */
 
-           pane.description = function(val) {
-               if (!arguments.length) return _description;
-               _description = val;
-               return pane;
-           };
+             var multipolys = [new MultiPolyIn(geom, true)];
 
-           pane.iconName = function(val) {
-               if (!arguments.length) return _iconName;
-               _iconName = val;
-               return pane;
-           };
+             for (var i = 0, iMax = moreGeoms.length; i < iMax; i++) {
+               multipolys.push(new MultiPolyIn(moreGeoms[i], false));
+             }
 
-           pane.sections = function(val) {
-               if (!arguments.length) return _sections;
-               _sections = val;
-               return pane;
-           };
+             operation.numMultiPolys = multipolys.length;
+             /* BBox optimization for difference operation
+              * If the bbox of a multipolygon that's part of the clipping doesn't
+              * intersect the bbox of the subject at all, we can just drop that
+              * multiploygon. */
 
-           pane.selection = function() {
-               return _paneSelection;
-           };
+             if (operation.type === 'difference') {
+               // in place removal
+               var subject = multipolys[0];
+               var _i = 1;
 
-           function hidePane() {
-               context.ui().togglePanes();
-           }
+               while (_i < multipolys.length) {
+                 if (getBboxOverlap(multipolys[_i].bbox, subject.bbox) !== null) _i++;else multipolys.splice(_i, 1);
+               }
+             }
+             /* BBox optimization for intersection operation
+              * If we can find any pair of multipolygons whose bbox does not overlap,
+              * then the result will be empty. */
 
-           pane.togglePane = function() {
-               if (event) event.preventDefault();
-               _paneTooltip.hide();
-               context.ui().togglePanes(!_paneSelection.classed('shown') ? _paneSelection : undefined);
-           };
 
-           pane.renderToggleButton = function(selection) {
+             if (operation.type === 'intersection') {
+               // TODO: this is O(n^2) in number of polygons. By sorting the bboxes,
+               //       it could be optimized to O(n * ln(n))
+               for (var _i2 = 0, _iMax = multipolys.length; _i2 < _iMax; _i2++) {
+                 var mpA = multipolys[_i2];
 
-               if (!_paneTooltip) {
-                   _paneTooltip = uiTooltip()
-                       .placement((_mainLocalizer.textDirection() === 'rtl') ? 'right' : 'left')
-                       .title(_description)
-                       .keys([_key]);
+                 for (var j = _i2 + 1, jMax = multipolys.length; j < jMax; j++) {
+                   if (getBboxOverlap(mpA.bbox, multipolys[j].bbox) === null) return [];
+                 }
                }
+             }
+             /* Put segment endpoints in a priority queue */
 
-               selection
-                   .append('button')
-                   .on('click', pane.togglePane)
-                   .call(svgIcon('#' + _iconName, 'light'))
-                   .call(_paneTooltip);
-           };
 
-           pane.renderContent = function(selection) {
-               // override to fully customize content
+             var queue = new Tree(SweepEvent$1.compare);
 
-               if (_sections) {
-                   _sections.forEach(function(section) {
-                       selection.call(section.render);
-                   });
+             for (var _i3 = 0, _iMax2 = multipolys.length; _i3 < _iMax2; _i3++) {
+               var sweepEvents = multipolys[_i3].getSweepEvents();
+
+               for (var _j = 0, _jMax = sweepEvents.length; _j < _jMax; _j++) {
+                 queue.insert(sweepEvents[_j]);
+
+                 if (queue.size > POLYGON_CLIPPING_MAX_QUEUE_SIZE) {
+                   // prevents an infinite loop, an otherwise common manifestation of bugs
+                   throw new Error('Infinite loop when putting segment endpoints in a priority queue ' + '(queue size too big). Please file a bug report.');
+                 }
                }
-           };
+             }
+             /* Pass the sweep line over those endpoints */
 
-           pane.renderPane = function(selection) {
 
-               _paneSelection = selection
-                   .append('div')
-                   .attr('class', 'fillL map-pane hide ' + id + '-pane')
-                   .attr('pane', id);
+             var sweepLine = new SweepLine(queue);
+             var prevQueueSize = queue.size;
+             var node = queue.pop();
 
-               var heading = _paneSelection
-                   .append('div')
-                   .attr('class', 'pane-heading');
+             while (node) {
+               var evt = node.key;
 
-               heading
-                   .append('h2')
-                   .text(_title);
+               if (queue.size === prevQueueSize) {
+                 // prevents an infinite loop, an otherwise common manifestation of bugs
+                 var seg = evt.segment;
+                 throw new Error("Unable to pop() ".concat(evt.isLeft ? 'left' : 'right', " SweepEvent ") + "[".concat(evt.point.x, ", ").concat(evt.point.y, "] from segment #").concat(seg.id, " ") + "[".concat(seg.leftSE.point.x, ", ").concat(seg.leftSE.point.y, "] -> ") + "[".concat(seg.rightSE.point.x, ", ").concat(seg.rightSE.point.y, "] from queue. ") + 'Please file a bug report.');
+               }
 
-               heading
-                   .append('button')
-                   .on('click', hidePane)
-                   .call(svgIcon('#iD-icon-close'));
+               if (queue.size > POLYGON_CLIPPING_MAX_QUEUE_SIZE) {
+                 // prevents an infinite loop, an otherwise common manifestation of bugs
+                 throw new Error('Infinite loop when passing sweep line over endpoints ' + '(queue size too big). Please file a bug report.');
+               }
 
+               if (sweepLine.segments.length > POLYGON_CLIPPING_MAX_SWEEPLINE_SEGMENTS) {
+                 // prevents an infinite loop, an otherwise common manifestation of bugs
+                 throw new Error('Infinite loop when passing sweep line over endpoints ' + '(too many sweep line segments). Please file a bug report.');
+               }
 
-               _paneSelection
-                   .append('div')
-                   .attr('class', 'pane-content')
-                   .call(pane.renderContent);
+               var newEvents = sweepLine.process(evt);
 
-               if (_key) {
-                   context.keybinding()
-                       .on(_key, pane.togglePane);
+               for (var _i4 = 0, _iMax3 = newEvents.length; _i4 < _iMax3; _i4++) {
+                 var _evt = newEvents[_i4];
+                 if (_evt.consumedBy === undefined) queue.insert(_evt);
                }
-           };
 
-           return pane;
-       }
+               prevQueueSize = queue.size;
+               node = queue.pop();
+             } // free some memory we don't need anymore
 
-       function uiSectionBackgroundDisplayOptions(context) {
 
-           var section = uiSection('background-display-options', context)
-               .title(_t('background.display_options'))
-               .disclosureContent(renderDisclosureContent);
+             rounder.reset();
+             /* Collect and compile segments we're keeping into a multipolygon */
 
-           var _detected = utilDetect();
-           var _storedOpacity = corePreferences('background-opacity');
-           var _minVal = 0.25;
-           var _maxVal = _detected.cssfilters ? 2 : 1;
+             var ringsOut = RingOut.factory(sweepLine.segments);
+             var result = new MultiPolyOut(ringsOut);
+             return result.getGeom();
+           }
+         }]);
 
-           var _sliders = _detected.cssfilters
-               ? ['brightness', 'contrast', 'saturation', 'sharpness']
-               : ['brightness'];
+         return Operation;
+       }(); // singleton available by import
 
-           var _options = {
-               brightness: (_storedOpacity !== null ? (+_storedOpacity) : 1),
-               contrast: 1,
-               saturation: 1,
-               sharpness: 1
-           };
 
-           function clamp(x, min, max) {
-               return Math.max(min, Math.min(x, max));
-           }
+       var operation = new Operation();
 
-           function updateValue(d, val) {
-               if (!val && event && event.target) {
-                   val = event.target.value;
-               }
+       var union$1 = function union(geom) {
+         for (var _len = arguments.length, moreGeoms = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
+           moreGeoms[_key - 1] = arguments[_key];
+         }
 
-               val = clamp(val, _minVal, _maxVal);
+         return operation.run('union', geom, moreGeoms);
+       };
 
-               _options[d] = val;
-               context.background()[d](val);
+       var intersection$1$1 = function intersection(geom) {
+         for (var _len2 = arguments.length, moreGeoms = new Array(_len2 > 1 ? _len2 - 1 : 0), _key2 = 1; _key2 < _len2; _key2++) {
+           moreGeoms[_key2 - 1] = arguments[_key2];
+         }
 
-               if (d === 'brightness') {
-                   corePreferences('background-opacity', val);
-               }
+         return operation.run('intersection', geom, moreGeoms);
+       };
 
-               section.reRender();
-           }
+       var xor = function xor(geom) {
+         for (var _len3 = arguments.length, moreGeoms = new Array(_len3 > 1 ? _len3 - 1 : 0), _key3 = 1; _key3 < _len3; _key3++) {
+           moreGeoms[_key3 - 1] = arguments[_key3];
+         }
 
-           function renderDisclosureContent(selection) {
-               var container = selection.selectAll('.display-options-container')
-                   .data([0]);
+         return operation.run('xor', geom, moreGeoms);
+       };
 
-               var containerEnter = container.enter()
-                   .append('div')
-                   .attr('class', 'display-options-container controls-list');
+       var difference = function difference(subjectGeom) {
+         for (var _len4 = arguments.length, clippingGeoms = new Array(_len4 > 1 ? _len4 - 1 : 0), _key4 = 1; _key4 < _len4; _key4++) {
+           clippingGeoms[_key4 - 1] = arguments[_key4];
+         }
 
-               // add slider controls
-               var slidersEnter = containerEnter.selectAll('.display-control')
-                   .data(_sliders)
-                   .enter()
-                   .append('div')
-                   .attr('class', function(d) { return 'display-control display-control-' + d; });
-
-               slidersEnter
-                   .append('h5')
-                   .text(function(d) { return _t('background.' + d); })
-                   .append('span')
-                   .attr('class', function(d) { return 'display-option-value display-option-value-' + d; });
-
-               slidersEnter
-                   .append('input')
-                   .attr('class', function(d) { return 'display-option-input display-option-input-' + d; })
-                   .attr('type', 'range')
-                   .attr('min', _minVal)
-                   .attr('max', _maxVal)
-                   .attr('step', '0.05')
-                   .on('input', function(d) {
-                       var val = select(this).property('value');
-                       updateValue(d, val);
-                   });
+         return operation.run('difference', subjectGeom, clippingGeoms);
+       };
 
-               slidersEnter
-                   .append('button')
-                   .attr('title', _t('background.reset'))
-                   .attr('class', function(d) { return 'display-option-reset display-option-reset-' + d; })
-                   .on('click', function(d) {
-                       if (event.button !== 0) return;
-                       updateValue(d, 1);
-                   })
-                   .call(svgIcon('#iD-icon-' + (_mainLocalizer.textDirection() === 'rtl' ? 'redo' : 'undo')));
-
-               // reset all button
-               containerEnter
-                   .append('a')
-                   .attr('class', 'display-option-resetlink')
-                   .attr('href', '#')
-                   .text(_t('background.reset_all'))
-                   .on('click', function() {
-                       for (var i = 0; i < _sliders.length; i++) {
-                           updateValue(_sliders[i],1);
-                       }
-                   });
+       var index$1 = {
+         union: union$1,
+         intersection: intersection$1$1,
+         xor: xor,
+         difference: difference
+       };
 
-               // update
-               container = containerEnter
-                   .merge(container);
+       var geojsonPrecision = createCommonjsModule(function (module) {
+         (function () {
+           function parse(t, coordinatePrecision, extrasPrecision) {
+             function point(p) {
+               return p.map(function (e, index) {
+                 if (index < 2) {
+                   return 1 * e.toFixed(coordinatePrecision);
+                 } else {
+                   return 1 * e.toFixed(extrasPrecision);
+                 }
+               });
+             }
 
-               container.selectAll('.display-option-input')
-                   .property('value', function(d) { return _options[d]; });
+             function multi(l) {
+               return l.map(point);
+             }
 
-               container.selectAll('.display-option-value')
-                   .text(function(d) { return Math.floor(_options[d] * 100) + '%'; });
+             function poly(p) {
+               return p.map(multi);
+             }
 
-               container.selectAll('.display-option-reset')
-                   .classed('disabled', function(d) { return _options[d] === 1; });
+             function multiPoly(m) {
+               return m.map(poly);
+             }
 
-               // first time only, set brightness if needed
-               if (containerEnter.size() && _options.brightness !== 1) {
-                   context.background().brightness(_options.brightness);
+             function geometry(obj) {
+               if (!obj) {
+                 return {};
                }
-           }
-
-           return section;
-       }
 
-       function uiSettingsCustomBackground() {
-           var dispatch$1 = dispatch('change');
+               switch (obj.type) {
+                 case "Point":
+                   obj.coordinates = point(obj.coordinates);
+                   return obj;
 
-           function render(selection) {
-               // keep separate copies of original and current settings
-               var _origSettings = {
-                   template: corePreferences('background-custom-template')
-               };
-               var _currSettings = {
-                   template: corePreferences('background-custom-template')
-               };
+                 case "LineString":
+                 case "MultiPoint":
+                   obj.coordinates = multi(obj.coordinates);
+                   return obj;
 
-               var example = 'https://{switch:a,b,c}.tile.openstreetmap.org/{zoom}/{x}/{y}.png';
-               var modal = uiConfirm(selection).okButton();
-
-               modal
-                   .classed('settings-modal settings-custom-background', true);
-
-               modal.select('.modal-section.header')
-                   .append('h3')
-                   .text(_t('settings.custom_background.header'));
-
-
-               var textSection = modal.select('.modal-section.message-text');
-
-               var instructions =
-                   `${_t('settings.custom_background.instructions.info')}\n` +
-                   '\n' +
-                   `#### ${_t('settings.custom_background.instructions.wms.tokens_label')}\n` +
-                   `* ${_t('settings.custom_background.instructions.wms.tokens.proj')}\n` +
-                   `* ${_t('settings.custom_background.instructions.wms.tokens.wkid')}\n` +
-                   `* ${_t('settings.custom_background.instructions.wms.tokens.dimensions')}\n` +
-                   `* ${_t('settings.custom_background.instructions.wms.tokens.bbox')}\n` +
-                   '\n' +
-                   `#### ${_t('settings.custom_background.instructions.tms.tokens_label')}\n` +
-                   `* ${_t('settings.custom_background.instructions.tms.tokens.xyz')}\n` +
-                   `* ${_t('settings.custom_background.instructions.tms.tokens.flipped_y')}\n` +
-                   `* ${_t('settings.custom_background.instructions.tms.tokens.switch')}\n` +
-                   `* ${_t('settings.custom_background.instructions.tms.tokens.quadtile')}\n` +
-                   `* ${_t('settings.custom_background.instructions.tms.tokens.scale_factor')}\n` +
-                   '\n' +
-                   `#### ${_t('settings.custom_background.instructions.example')}\n` +
-                   `\`${example}\``;
-
-               textSection
-                   .append('div')
-                   .attr('class', 'instructions-template')
-                   .html(marked_1(instructions));
+                 case "Polygon":
+                 case "MultiLineString":
+                   obj.coordinates = poly(obj.coordinates);
+                   return obj;
 
-               textSection
-                   .append('textarea')
-                   .attr('class', 'field-template')
-                   .attr('placeholder', _t('settings.custom_background.template.placeholder'))
-                   .call(utilNoAuto)
-                   .property('value', _currSettings.template);
+                 case "MultiPolygon":
+                   obj.coordinates = multiPoly(obj.coordinates);
+                   return obj;
 
+                 case "GeometryCollection":
+                   obj.geometries = obj.geometries.map(geometry);
+                   return obj;
 
-               // insert a cancel button
-               var buttonSection = modal.select('.modal-section.buttons');
+                 default:
+                   return {};
+               }
+             }
 
-               buttonSection
-                   .insert('button', '.ok-button')
-                   .attr('class', 'button cancel-button secondary-action')
-                   .text(_t('confirm.cancel'));
+             function feature(obj) {
+               obj.geometry = geometry(obj.geometry);
+               return obj;
+             }
 
+             function featureCollection(f) {
+               f.features = f.features.map(feature);
+               return f;
+             }
 
-               buttonSection.select('.cancel-button')
-                   .on('click.cancel', clickCancel);
+             function geometryCollection(g) {
+               g.geometries = g.geometries.map(geometry);
+               return g;
+             }
 
-               buttonSection.select('.ok-button')
-                   .attr('disabled', isSaveDisabled)
-                   .on('click.save', clickSave);
+             if (!t) {
+               return t;
+             }
 
+             switch (t.type) {
+               case "Feature":
+                 return feature(t);
 
-               function isSaveDisabled() {
-                   return null;
-               }
+               case "GeometryCollection":
+                 return geometryCollection(t);
 
+               case "FeatureCollection":
+                 return featureCollection(t);
 
-               // restore the original template
-               function clickCancel() {
-                   textSection.select('.field-template').property('value', _origSettings.template);
-                   corePreferences('background-custom-template', _origSettings.template);
-                   this.blur();
-                   modal.close();
-               }
+               case "Point":
+               case "LineString":
+               case "Polygon":
+               case "MultiPoint":
+               case "MultiPolygon":
+               case "MultiLineString":
+                 return geometry(t);
 
-               // accept the current template
-               function clickSave() {
-                   _currSettings.template = textSection.select('.field-template').property('value');
-                   corePreferences('background-custom-template', _currSettings.template);
-                   this.blur();
-                   modal.close();
-                   dispatch$1.call('change', this, _currSettings);
-               }
+               default:
+                 return t;
+             }
            }
 
-           return utilRebind(render, dispatch$1, 'on');
+           module.exports = parse;
+           module.exports.parse = parse;
+         })();
+       });
+
+       function isObject$4(obj) {
+         return _typeof(obj) === 'object' && obj !== null;
        }
 
-       function uiSectionBackgroundList(context) {
+       function forEach(obj, cb) {
+         if (Array.isArray(obj)) {
+           obj.forEach(cb);
+         } else if (isObject$4(obj)) {
+           Object.keys(obj).forEach(function (key) {
+             var val = obj[key];
+             cb(val, key);
+           });
+         }
+       }
 
-           var _backgroundList = select(null);
+       function getTreeDepth(obj) {
+         var depth = 0;
 
-           var _customSource = context.background().findSource('custom');
+         if (Array.isArray(obj) || isObject$4(obj)) {
+           forEach(obj, function (val) {
+             if (Array.isArray(val) || isObject$4(val)) {
+               var tmpDepth = getTreeDepth(val);
 
-           var _settingsCustomBackground = uiSettingsCustomBackground()
-               .on('change', customChanged);
+               if (tmpDepth > depth) {
+                 depth = tmpDepth;
+               }
+             }
+           });
+           return depth + 1;
+         }
 
-           var section = uiSection('background-list', context)
-               .title(_t('background.backgrounds'))
-               .disclosureContent(renderDisclosureContent);
+         return depth;
+       }
 
-           function previousBackgroundID() {
-               return corePreferences('background-last-used-toggle');
+       function stringify(obj, options) {
+         options = options || {};
+         var indent = JSON.stringify([1], null, get$5(options, 'indent', 2)).slice(2, -3);
+         var addMargin = get$5(options, 'margins', false);
+         var addArrayMargin = get$5(options, 'arrayMargins', false);
+         var addObjectMargin = get$5(options, 'objectMargins', false);
+         var maxLength = indent === '' ? Infinity : get$5(options, 'maxLength', 80);
+         var maxNesting = get$5(options, 'maxNesting', Infinity);
+         return function _stringify(obj, currentIndent, reserved) {
+           if (obj && typeof obj.toJSON === 'function') {
+             obj = obj.toJSON();
            }
 
-           function renderDisclosureContent(selection) {
+           var string = JSON.stringify(obj);
 
-               // the background list
-               var container = selection.selectAll('.layer-background-list')
-                   .data([0]);
+           if (string === undefined) {
+             return string;
+           }
 
-               _backgroundList = container.enter()
-                   .append('ul')
-                   .attr('class', 'layer-list layer-background-list')
-                   .attr('dir', 'auto')
-                   .merge(container);
+           var length = maxLength - currentIndent.length - reserved;
+           var treeDepth = getTreeDepth(obj);
 
+           if (treeDepth <= maxNesting && string.length <= length) {
+             var prettified = prettify(string, {
+               addMargin: addMargin,
+               addArrayMargin: addArrayMargin,
+               addObjectMargin: addObjectMargin
+             });
 
-               // add minimap toggle below list
-               var bgExtrasListEnter = selection.selectAll('.bg-extras-list')
-                   .data([0])
-                   .enter()
-                   .append('ul')
-                   .attr('class', 'layer-list bg-extras-list');
-
-               var minimapLabelEnter = bgExtrasListEnter
-                   .append('li')
-                   .attr('class', 'minimap-toggle-item')
-                   .append('label')
-                   .call(uiTooltip()
-                       .title(_t('background.minimap.tooltip'))
-                       .keys([_t('background.minimap.key')])
-                       .placement('top')
-                   );
-
-               minimapLabelEnter
-                   .append('input')
-                   .attr('type', 'checkbox')
-                   .on('change', function() {
-                       event.preventDefault();
-                       uiMapInMap.toggle();
-                   });
+             if (prettified.length <= length) {
+               return prettified;
+             }
+           }
 
-               minimapLabelEnter
-                   .append('span')
-                   .text(_t('background.minimap.description'));
-
-
-               var panelLabelEnter = bgExtrasListEnter
-                   .append('li')
-                   .attr('class', 'background-panel-toggle-item')
-                   .append('label')
-                   .call(uiTooltip()
-                       .title(_t('background.panel.tooltip'))
-                       .keys([uiCmd('⌘⇧' + _t('info_panels.background.key'))])
-                       .placement('top')
-                   );
-
-               panelLabelEnter
-                   .append('input')
-                   .attr('type', 'checkbox')
-                   .on('change', function() {
-                       event.preventDefault();
-                       context.ui().info.toggle('background');
-                   });
+           if (isObject$4(obj)) {
+             var nextIndent = currentIndent + indent;
+             var items = [];
+             var delimiters;
 
-               panelLabelEnter
-                   .append('span')
-                   .text(_t('background.panel.description'));
-
-               var locPanelLabelEnter = bgExtrasListEnter
-                   .append('li')
-                   .attr('class', 'location-panel-toggle-item')
-                   .append('label')
-                   .call(uiTooltip()
-                       .title(_t('background.location_panel.tooltip'))
-                       .keys([uiCmd('⌘⇧' + _t('info_panels.location.key'))])
-                       .placement('top')
-                   );
-
-               locPanelLabelEnter
-                   .append('input')
-                   .attr('type', 'checkbox')
-                   .on('change', function() {
-                       event.preventDefault();
-                       context.ui().info.toggle('location');
-                   });
+             var comma = function comma(array, index) {
+               return index === array.length - 1 ? 0 : 1;
+             };
 
-               locPanelLabelEnter
-                   .append('span')
-                   .text(_t('background.location_panel.description'));
+             if (Array.isArray(obj)) {
+               for (var index = 0; index < obj.length; index++) {
+                 items.push(_stringify(obj[index], nextIndent, comma(obj, index)) || 'null');
+               }
 
+               delimiters = '[]';
+             } else {
+               Object.keys(obj).forEach(function (key, index, array) {
+                 var keyPart = JSON.stringify(key) + ': ';
 
-               // "Info / Report a Problem" link
-               selection.selectAll('.imagery-faq')
-                   .data([0])
-                   .enter()
-                   .append('div')
-                   .attr('class', 'imagery-faq')
-                   .append('a')
-                   .attr('target', '_blank')
-                   .call(svgIcon('#iD-icon-out-link', 'inline'))
-                   .attr('href', 'https://github.com/openstreetmap/iD/blob/develop/FAQ.md#how-can-i-report-an-issue-with-background-imagery')
-                   .append('span')
-                   .text(_t('background.imagery_problem_faq'));
-
-               _backgroundList
-                   .call(drawListItems, 'radio', chooseBackground, function(d) { return !d.isHidden() && !d.overlay; });
-           }
-
-           function setTooltips(selection) {
-               selection.each(function(d, i, nodes) {
-                   var item = select(this).select('label');
-                   var span = item.select('span');
-                   var placement = (i < nodes.length / 2) ? 'bottom' : 'top';
-                   var description = d.description();
-                   var isOverflowing = (span.property('clientWidth') !== span.property('scrollWidth'));
-
-                   item.call(uiTooltip().destroyAny);
-
-                   if (d.id === previousBackgroundID()) {
-                       item.call(uiTooltip()
-                           .placement(placement)
-                           .title('<div>' + _t('background.switch') + '</div>')
-                           .keys([uiCmd('⌘' + _t('background.key'))])
-                       );
-                   } else if (description || isOverflowing) {
-                       item.call(uiTooltip()
-                           .placement(placement)
-                           .title(description || d.name())
-                       );
-                   }
+                 var value = _stringify(obj[key], nextIndent, keyPart.length + comma(array, index));
+
+                 if (value !== undefined) {
+                   items.push(keyPart + value);
+                 }
                });
+               delimiters = '{}';
+             }
+
+             if (items.length > 0) {
+               return [delimiters[0], indent + items.join(',\n' + nextIndent), delimiters[1]].join('\n' + currentIndent);
+             }
            }
 
-           function drawListItems(layerList, type, change, filter) {
-               var sources = context.background()
-                   .sources(context.map().extent(), context.map().zoom(), true)
-                   .filter(filter);
+           return string;
+         }(obj, '', 0);
+       } // Note: This regex matches even invalid JSON strings, but since we’re
+       // working on the output of `JSON.stringify` we know that only valid strings
+       // are present (unless the user supplied a weird `options.indent` but in
+       // that case we don’t care since the output would be invalid anyway).
+
 
-               var layerLinks = layerList.selectAll('li')
-                   .data(sources, function(d) { return d.name(); });
+       var stringOrChar = /("(?:[^\\"]|\\.)*")|[:,\][}{]/g;
 
-               layerLinks.exit()
-                   .remove();
+       function prettify(string, options) {
+         options = options || {};
+         var tokens = {
+           '{': '{',
+           '}': '}',
+           '[': '[',
+           ']': ']',
+           ',': ', ',
+           ':': ': '
+         };
 
-               var enter = layerLinks.enter()
-                   .append('li')
-                   .classed('layer-custom', function(d) { return d.id === 'custom'; })
-                   .classed('best', function(d) { return d.best(); });
+         if (options.addMargin || options.addObjectMargin) {
+           tokens['{'] = '{ ';
+           tokens['}'] = ' }';
+         }
 
-               var label = enter
-                   .append('label');
+         if (options.addMargin || options.addArrayMargin) {
+           tokens['['] = '[ ';
+           tokens[']'] = ' ]';
+         }
 
-               label
-                   .append('input')
-                   .attr('type', type)
-                   .attr('name', 'layers')
-                   .on('change', change);
+         return string.replace(stringOrChar, function (match, string) {
+           return string ? match : tokens[match];
+         });
+       }
 
-               label
-                   .append('span')
-                   .text(function(d) { return d.name(); });
+       function get$5(options, name, defaultValue) {
+         return name in options ? options[name] : defaultValue;
+       }
 
-               enter.filter(function(d) { return d.id === 'custom'; })
-                   .append('button')
-                   .attr('class', 'layer-browse')
-                   .call(uiTooltip()
-                       .title(_t('settings.custom_background.tooltip'))
-                       .placement((_mainLocalizer.textDirection() === 'rtl') ? 'right' : 'left')
-                   )
-                   .on('click', editCustom)
-                   .call(svgIcon('#iD-icon-more'));
+       var jsonStringifyPrettyCompact = stringify;
 
-               enter.filter(function(d) { return d.best(); })
-                   .append('div')
-                   .attr('class', 'best')
-                   .call(uiTooltip()
-                       .title(_t('background.best_imagery'))
-                       .placement((_mainLocalizer.textDirection() === 'rtl') ? 'right' : 'left')
-                   )
-                   .append('span')
-                   .html('&#9733;');
+       var _default$3 = /*#__PURE__*/function () {
+         // constructor
+         //
+         // `fc`  Optional FeatureCollection of known features
+         //
+         // Optionally pass a GeoJSON FeatureCollection of known features which we can refer to later.
+         // Each feature must have a filename-like `id`, for example: `something.geojson`
+         //
+         // {
+         //   "type": "FeatureCollection"
+         //   "features": [
+         //     {
+         //       "type": "Feature",
+         //       "id": "philly_metro.geojson",
+         //       "properties": { … },
+         //       "geometry": { … }
+         //     }
+         //   ]
+         // }
+         function _default(fc) {
+           var _this = this;
+
+           _classCallCheck(this, _default);
 
+           // The _cache retains resolved features, so if you ask for the same thing multiple times
+           // we don't repeat the expensive resolving/clipping operations.
+           //
+           // Each feature has a stable identifier that is used as the cache key.
+           // The identifiers look like:
+           // - for point locations, the stringified point:          e.g. '[8.67039,49.41882]'
+           // - for geojson locations, the geojson id:               e.g. 'de-hamburg.geojson'
+           // - for countrycoder locations, feature.id property:     e.g. 'Q2'  (countrycoder uses Wikidata identifiers)
+           // - for aggregated locationSets, +[include]-[exclude]:   e.g '+[Q2]-[Q18,Q27611]'
+           this._cache = {}; // When strict mode = true, throw on invalid locations or locationSets.
+           // When strict mode = false, return `null` for invalid locations or locationSets.
 
-               layerList.selectAll('li')
-                   .sort(sortSources);
+           this._strict = true; // process input FeatureCollection
 
-               layerList
-                   .call(updateLayerSelections);
+           if (fc && fc.type === 'FeatureCollection' && Array.isArray(fc.features)) {
+             fc.features.forEach(function (feature) {
+               feature.properties = feature.properties || {};
+               var props = feature.properties; // get `id` from either `id` or `properties`
 
+               var id = feature.id || props.id;
+               if (!id || !/^\S+\.geojson$/i.test(id)) return; // ensure `id` exists and is lowercase
 
-               function sortSources(a, b) {
-                   return a.best() && !b.best() ? -1
-                       : b.best() && !a.best() ? 1
-                       : d3_descending(a.area(), b.area()) || d3_ascending(a.name(), b.name()) || 0;
-               }
-           }
+               id = id.toLowerCase();
+               feature.id = id;
+               props.id = id; // ensure `area` property exists
+
+               if (!props.area) {
+                 var area = geojsonArea.geometry(feature.geometry) / 1e6; // m² to km²
 
-           function updateLayerSelections(selection) {
-               function active(d) {
-                   return context.background().showsLayer(d);
+                 props.area = Number(area.toFixed(2));
                }
 
-               selection.selectAll('li')
-                   .classed('active', active)
-                   .classed('switch', function(d) { return d.id === previousBackgroundID(); })
-                   .call(setTooltips)
-                   .selectAll('input')
-                   .property('checked', active);
-           }
+               _this._cache[id] = feature;
+             });
+           } // Replace CountryCoder world geometry to be a polygon covering the world.
 
 
-           function chooseBackground(d) {
-               if (d.id === 'custom' && !d.template()) {
-                   return editCustom();
-               }
+           var world = _cloneDeep(feature('Q2'));
 
-               event.preventDefault();
-               var previousBackground = context.background().baseLayerSource();
-               corePreferences('background-last-used-toggle', previousBackground.id);
-               corePreferences('background-last-used', d.id);
-               context.background().baseLayerSource(d);
-               document.activeElement.blur();
-           }
+           world.geometry = {
+             type: 'Polygon',
+             coordinates: [[[-180, -90], [180, -90], [180, 90], [-180, 90], [-180, -90]]]
+           };
+           world.id = 'Q2';
+           world.properties.id = 'Q2';
+           world.properties.area = geojsonArea.geometry(world.geometry) / 1e6; // m² to km²
+
+           this._cache.Q2 = world;
+         } // validateLocation
+         // `location`  The location to validate
+         //
+         // Pass a `location` value to validate
+         //
+         // Returns a result like:
+         //   {
+         //     type:     'point', 'geojson', or 'countrycoder'
+         //     location:  the queried location
+         //     id:        the stable identifier for the feature
+         //   }
+         // or `null` if the location is invalid
+         //
 
 
-           function customChanged(d) {
-               if (d && d.template) {
-                   _customSource.template(d.template);
-                   chooseBackground(_customSource);
-               } else {
-                   _customSource.template('');
-                   chooseBackground(context.background().findSource('none'));
+         _createClass(_default, [{
+           key: "validateLocation",
+           value: function validateLocation(location) {
+             if (Array.isArray(location)) {
+               // a [lon,lat] coordinate pair?
+               if (location.length === 2 && Number.isFinite(location[0]) && Number.isFinite(location[1]) && location[0] >= -180 && location[0] <= 180 && location[1] >= -90 && location[1] <= 90) {
+                 var id = '[' + location.toString() + ']';
+                 return {
+                   type: 'point',
+                   location: location,
+                   id: id
+                 };
                }
-           }
+             } else if (typeof location === 'string' && /^\S+\.geojson$/i.test(location)) {
+               // a .geojson filename?
+               var _id = location.toLowerCase();
 
+               if (this._cache[_id]) {
+                 return {
+                   type: 'geojson',
+                   location: location,
+                   id: _id
+                 };
+               }
+             } else if (typeof location === 'string' || typeof location === 'number') {
+               // a country-coder value?
+               var feature$1 = feature(location);
 
-           function editCustom() {
-               event.preventDefault();
-               context.container()
-                   .call(_settingsCustomBackground);
-           }
+               if (feature$1) {
+                 // Use wikidata QID as the identifier, since that seems to be the one
+                 // property that everything in CountryCoder is guaranteed to have.
+                 var _id2 = feature$1.properties.wikidata;
+                 return {
+                   type: 'countrycoder',
+                   location: location,
+                   id: _id2
+                 };
+               }
+             }
+
+             if (this._strict) {
+               throw new Error("validateLocation:  Invalid location: \"".concat(location, "\"."));
+             } else {
+               return null;
+             }
+           } // resolveLocation
+           // `location`  The location to resolve
+           //
+           // Pass a `location` value to resolve
+           //
+           // Returns a result like:
+           //   {
+           //     type:      'point', 'geojson', or 'countrycoder'
+           //     location:  the queried location
+           //     id:        a stable identifier for the feature
+           //     feature:   the resolved GeoJSON feature
+           //   }
+           //  or `null` if the location is invalid
+           //
 
+         }, {
+           key: "resolveLocation",
+           value: function resolveLocation(location) {
+             var valid = this.validateLocation(location);
+             if (!valid) return null;
+             var id = valid.id; // return a result from cache if we can
 
-           context.background()
-               .on('change.background_list', function() {
-                   _backgroundList.call(updateLayerSelections);
+             if (this._cache[id]) {
+               return Object.assign(valid, {
+                 feature: this._cache[id]
                });
+             } // a [lon,lat] coordinate pair?
 
-           context.map()
-               .on('move.background_list',
-                   debounce(function() {
-                       // layers in-view may have changed due to map move
-                       window.requestIdleCallback(section.reRender);
-                   }, 1000)
-               );
 
-           return section;
-       }
+             if (valid.type === 'point') {
+               var RADIUS = 25000; // meters
 
-       function uiSectionBackgroundOffset(context) {
+               var EDGES = 10;
+               var PRECISION = 3;
+               var area = Math.PI * RADIUS * RADIUS / 1e6; // m² to km²
 
-           var section = uiSection('background-offset', context)
-               .title(_t('background.fix_misalignment'))
-               .disclosureContent(renderDisclosureContent)
-               .expandedByDefault(false);
+               var feature$1 = this._cache[id] = geojsonPrecision({
+                 type: 'Feature',
+                 id: id,
+                 properties: {
+                   id: id,
+                   area: Number(area.toFixed(2))
+                 },
+                 geometry: circleToPolygon(location, RADIUS, EDGES)
+               }, PRECISION);
+               return Object.assign(valid, {
+                 feature: feature$1
+               }); // a .geojson filename?
+             } else if (valid.type === 'geojson') ; else if (valid.type === 'countrycoder') {
+               var _feature = _cloneDeep(feature(id));
+
+               var props = _feature.properties; // -> This block of code is weird and requires some explanation. <-
+               // CountryCoder includes higher level features which are made up of members.
+               // These features don't have their own geometry, but CountryCoder provides an
+               //   `aggregateFeature` method to combine these members into a MultiPolygon.
+               // BUT, when we try to actually work with these aggregated MultiPolygons,
+               //   Turf/JSTS gets crashy because of topography bugs.
+               // SO, we'll aggregate the features ourselves by unioning them together.
+               // This approach also has the benefit of removing all the internal boaders and
+               //   simplifying the regional polygons a lot.
+
+               if (Array.isArray(props.members)) {
+                 var seed = _feature.geometry ? _feature : null;
+                 var aggregate = props.members.reduce(_locationReducer.bind(this), seed);
+                 _feature.geometry = aggregate.geometry;
+               } // ensure `area` property exists
 
-           var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
 
-           var _directions = [
-               ['right', [0.5, 0]],
-               ['top', [0, -0.5]],
-               ['left', [-0.5, 0]],
-               ['bottom', [0, 0.5]]
-           ];
+               if (!props.area) {
+                 var _area = geojsonArea.geometry(_feature.geometry) / 1e6; // m² to km²
 
 
-           function cancelEvent() {
-               event.stopPropagation();
-               event.preventDefault();
-           }
+                 props.area = Number(_area.toFixed(2));
+               } // ensure `id` property exists
 
 
-           function updateValue() {
-               var meters = geoOffsetToMeters(context.background().offset());
-               var x = +meters[0].toFixed(2);
-               var y = +meters[1].toFixed(2);
+               _feature.id = id;
+               props.id = id;
+               this._cache[id] = _feature;
+               return Object.assign(valid, {
+                 feature: _feature
+               });
+             }
 
-               context.container().selectAll('.nudge-inner-rect')
-                   .select('input')
-                   .classed('error', false)
-                   .property('value', x + ', ' + y);
+             if (this._strict) {
+               throw new Error("resolveLocation:  Couldn't resolve location \"".concat(location, "\"."));
+             } else {
+               return null;
+             }
+           } // validateLocationSet
+           // `locationSet`  the locationSet to validate
+           //
+           // Pass a locationSet Object to validate like:
+           //   {
+           //     include: [ Array of locations ],
+           //     exclude: [ Array of locations ]
+           //   }
+           //
+           // Returns a result like:
+           //   {
+           //     type:         'locationset'
+           //     locationSet:  the queried locationSet
+           //     id:           the stable identifier for the feature
+           //   }
+           // or `null` if the locationSet is invalid
+           //
 
-               context.container().selectAll('.nudge-reset')
-                   .classed('disabled', function() {
-                       return (x === 0 && y === 0);
-                   });
-           }
+         }, {
+           key: "validateLocationSet",
+           value: function validateLocationSet(locationSet) {
+             locationSet = locationSet || {};
+             var validator = this.validateLocation.bind(this);
+             var include = (locationSet.include || []).map(validator).filter(Boolean);
+             var exclude = (locationSet.exclude || []).map(validator).filter(Boolean);
+
+             if (!include.length) {
+               if (this._strict) {
+                 throw new Error("validateLocationSet:  LocationSet includes nothing.");
+               } else {
+                 // non-strict mode, replace an empty locationSet with one that includes "the world"
+                 locationSet.include = ['Q2'];
+                 include = [{
+                   type: 'countrycoder',
+                   location: 'Q2',
+                   id: 'Q2'
+                 }];
+               }
+             } // generate stable identifier
 
 
-           function resetOffset() {
-               context.background().offset([0, 0]);
-               updateValue();
-           }
+             include.sort(_sortLocations);
+             var id = '+[' + include.map(function (d) {
+               return d.id;
+             }).join(',') + ']';
 
+             if (exclude.length) {
+               exclude.sort(_sortLocations);
+               id += '-[' + exclude.map(function (d) {
+                 return d.id;
+               }).join(',') + ']';
+             }
 
-           function nudge(d) {
-               context.background().nudge(d, context.map().zoom());
-               updateValue();
-           }
+             return {
+               type: 'locationset',
+               locationSet: locationSet,
+               id: id
+             };
+           } // resolveLocationSet
+           // `locationSet`  the locationSet to resolve
+           //
+           // Pass a locationSet Object to validate like:
+           //   {
+           //     include: [ Array of locations ],
+           //     exclude: [ Array of locations ]
+           //   }
+           //
+           // Returns a result like:
+           //   {
+           //     type:         'locationset'
+           //     locationSet:  the queried locationSet
+           //     id:           the stable identifier for the feature
+           //     feature:      the resolved GeoJSON feature
+           //   }
+           // or `null` if the locationSet is invalid
+           //
 
+         }, {
+           key: "resolveLocationSet",
+           value: function resolveLocationSet(locationSet) {
+             locationSet = locationSet || {};
+             var valid = this.validateLocationSet(locationSet);
+             if (!valid) return null;
+             var id = valid.id; // return a result from cache if we can
 
-           function pointerdownNudgeButton(d) {
-               var interval;
-               var timeout = window.setTimeout(function() {
-                       interval = window.setInterval(nudge.bind(null, d), 100);
-                   }, 500);
+             if (this._cache[id]) {
+               return Object.assign(valid, {
+                 feature: this._cache[id]
+               });
+             }
 
-               function doneNudge() {
-                   window.clearTimeout(timeout);
-                   window.clearInterval(interval);
-                   select(window)
-                       .on(_pointerPrefix + 'up.buttonoffset', null, true)
-                       .on(_pointerPrefix + 'down.buttonoffset', null, true);
-               }
+             var resolver = this.resolveLocation.bind(this);
+             var include = (locationSet.include || []).map(resolver).filter(Boolean);
+             var exclude = (locationSet.exclude || []).map(resolver).filter(Boolean); // return quickly if it's a single included location..
 
-               select(window)
-                   .on(_pointerPrefix + 'up.buttonoffset', doneNudge, true)
-                   .on(_pointerPrefix + 'down.buttonoffset', doneNudge, true);
+             if (include.length === 1 && exclude.length === 0) {
+               return Object.assign(valid, {
+                 feature: include[0].feature
+               });
+             } // calculate unions
 
-               nudge(d);
-           }
 
+             var includeGeoJSON = include.map(function (d) {
+               return d.location;
+             }).reduce(_locationReducer.bind(this), null);
+             var excludeGeoJSON = exclude.map(function (d) {
+               return d.location;
+             }).reduce(_locationReducer.bind(this), null); // calculate difference, update `area` and return result
 
-           function inputOffset() {
-               var input = select(this);
-               var d = input.node().value;
+             var resultGeoJSON = excludeGeoJSON ? _clip(includeGeoJSON, excludeGeoJSON, 'DIFFERENCE') : includeGeoJSON;
+             var area = geojsonArea.geometry(resultGeoJSON.geometry) / 1e6; // m² to km²
 
-               if (d === '') return resetOffset();
+             resultGeoJSON.id = id;
+             resultGeoJSON.properties = {
+               id: id,
+               area: Number(area.toFixed(2))
+             };
+             this._cache[id] = resultGeoJSON;
+             return Object.assign(valid, {
+               feature: resultGeoJSON
+             });
+           } // strict
+           //
 
-               d = d.replace(/;/g, ',').split(',').map(function(n) {
-                   // if n is NaN, it will always get mapped to false.
-                   return !isNaN(n) && n;
-               });
+         }, {
+           key: "strict",
+           value: function strict(val) {
+             if (val === undefined) {
+               // get
+               return this._strict;
+             } else {
+               // set
+               this._strict = val;
+               return this;
+             }
+           } // cache
+           // convenience method to access the internal cache
 
-               if (d.length !== 2 || !d[0] || !d[1]) {
-                   input.classed('error', true);
-                   return;
-               }
+         }, {
+           key: "cache",
+           value: function cache() {
+             return this._cache;
+           } // stringify
+           // convenience method to prettyStringify the given object
 
-               context.background().offset(geoMetersToOffset(d));
-               updateValue();
+         }, {
+           key: "stringify",
+           value: function stringify(obj, options) {
+             return jsonStringifyPrettyCompact(obj, options);
            }
+         }]);
 
+         return _default;
+       }(); // Wrap the mfogel/polygon-clipping library and return a GeoJSON feature.
 
-           function dragOffset() {
-               if (event.button !== 0) return;
-
-               var origin = [event.clientX, event.clientY];
+       function _clip(a, b, which) {
+         var fn = {
+           UNION: index$1.union,
+           DIFFERENCE: index$1.difference
+         }[which];
+         var coords = fn(a.geometry.coordinates, b.geometry.coordinates);
+         return {
+           type: 'Feature',
+           properties: {},
+           geometry: {
+             type: whichType(coords),
+             coordinates: coords
+           }
+         }; // is this a Polygon or a MultiPolygon?
 
-               var pointerId = event.pointerId || 'mouse';
+         function whichType(coords) {
+           var a = Array.isArray(coords);
+           var b = a && Array.isArray(coords[0]);
+           var c = b && Array.isArray(coords[0][0]);
+           var d = c && Array.isArray(coords[0][0][0]);
+           return d ? 'MultiPolygon' : 'Polygon';
+         }
+       } // Reduce an array of locations into a single GeoJSON feature
 
-               context.container()
-                   .append('div')
-                   .attr('class', 'nudge-surface');
 
-               select(window)
-                   .on(_pointerPrefix + 'move.drag-bg-offset', pointermove)
-                   .on(_pointerPrefix + 'up.drag-bg-offset', pointerup);
+       function _locationReducer(accumulator, location) {
+         /* eslint-disable no-console, no-invalid-this */
+         var result;
 
-               if (_pointerPrefix === 'pointer') {
-                   select(window)
-                       .on('pointercancel.drag-bg-offset', pointerup);
-               }
+         try {
+           var resolved = this.resolveLocation(location);
 
-               function pointermove() {
-                   if (pointerId !== (event.pointerId || 'mouse')) return;
+           if (!resolved || !resolved.feature) {
+             console.warn("Warning:  Couldn't resolve location \"".concat(location, "\""));
+             return accumulator;
+           }
 
-                   var latest = [event.clientX, event.clientY];
-                   var d = [
-                       -(origin[0] - latest[0]) / 4,
-                       -(origin[1] - latest[1]) / 4
-                   ];
+           result = !accumulator ? resolved.feature : _clip(accumulator, resolved.feature, 'UNION');
+         } catch (e) {
+           console.warn("Warning:  Error resolving location \"".concat(location, "\""));
+           console.warn(e);
+           result = accumulator;
+         }
 
-                   origin = latest;
-                   nudge(d);
-               }
+         return result;
+         /* eslint-enable no-console, no-invalid-this */
+       }
 
-               function pointerup() {
-                   if (pointerId !== (event.pointerId || 'mouse')) return;
-                   if (event.button !== 0) return;
+       function _cloneDeep(obj) {
+         return JSON.parse(JSON.stringify(obj));
+       } // Sorting the location lists is ok because they end up unioned together.
+       // This sorting makes it possible to generate a deterministic id.
 
-                   context.container().selectAll('.nudge-surface')
-                       .remove();
 
-                   select(window)
-                       .on('.drag-bg-offset', null);
-               }
-           }
+       function _sortLocations(a, b) {
+         var rank = {
+           countrycoder: 1,
+           geojson: 2,
+           point: 3
+         };
+         var aRank = rank[a.type];
+         var bRank = rank[b.type];
+         return aRank > bRank ? 1 : aRank < bRank ? -1 : a.id.localeCompare(b.id);
+       }
 
+       var _oci = null;
+       function uiSuccess(context) {
+         var MAXEVENTS = 2;
+         var dispatch$1 = dispatch('cancel');
 
-           function renderDisclosureContent(selection) {
-               var container = selection.selectAll('.nudge-container')
-                   .data([0]);
+         var _changeset;
 
-               var containerEnter = container.enter()
-                   .append('div')
-                   .attr('class', 'nudge-container cf');
+         var _location;
 
-               containerEnter
-                   .append('div')
-                   .attr('class', 'nudge-instructions')
-                   .text(_t('background.offset'));
+         ensureOSMCommunityIndex(); // start fetching the data
 
-               var nudgeEnter = containerEnter
-                   .append('div')
-                   .attr('class', 'nudge-outer-rect')
-                   .on(_pointerPrefix + 'down', dragOffset);
+         function ensureOSMCommunityIndex() {
+           var data = _mainFileFetcher;
+           return Promise.all([data.get('oci_resources'), data.get('oci_features')]).then(function (vals) {
+             if (_oci) return _oci;
+             var ociResources = vals[0].resources;
+             var loco = new _default$3(vals[1]);
+             var ociFeatures = {};
+             Object.values(ociResources).forEach(function (resource) {
+               var feature = loco.resolveLocationSet(resource.locationSet).feature;
+               var ociFeature = ociFeatures[feature.id];
 
-               nudgeEnter
-                   .append('div')
-                   .attr('class', 'nudge-inner-rect')
-                   .append('input')
-                   .on('change', inputOffset);
+               if (!ociFeature) {
+                 ociFeature = JSON.parse(JSON.stringify(feature)); // deep clone
 
-               containerEnter
-                   .append('div')
-                   .selectAll('button')
-                   .data(_directions).enter()
-                   .append('button')
-                   .attr('class', function(d) { return d[0] + ' nudge'; })
-                   .on('contextmenu', cancelEvent)
-                   .on(_pointerPrefix + 'down', function(d) {
-                       if (event.button !== 0) return;
-                       pointerdownNudgeButton(d[1]);
-                   });
+                 ociFeature.properties.resourceIDs = new Set();
+                 ociFeatures[feature.id] = ociFeature;
+               }
 
-               containerEnter
-                   .append('button')
-                   .attr('title', _t('background.reset'))
-                   .attr('class', 'nudge-reset disabled')
-                   .on('contextmenu', cancelEvent)
-                   .on('click', function() {
-                       event.preventDefault();
-                       if (event.button !== 0) return;
-                       resetOffset();
-                   })
-                   .call(svgIcon('#iD-icon-' + (_mainLocalizer.textDirection() === 'rtl' ? 'redo' : 'undo')));
+               ociFeature.properties.resourceIDs.add(resource.id);
+             });
+             return _oci = {
+               features: ociFeatures,
+               resources: ociResources,
+               query: whichPolygon_1({
+                 type: 'FeatureCollection',
+                 features: Object.values(ociFeatures)
+               })
+             };
+           });
+         } // string-to-date parsing in JavaScript is weird
 
-               updateValue();
-           }
 
-           context.background()
-               .on('change.backgroundOffset-update', updateValue);
+         function parseEventDate(when) {
+           if (!when) return;
+           var raw = when.trim();
+           if (!raw) return;
 
-           return section;
-       }
+           if (!/Z$/.test(raw)) {
+             // if no trailing 'Z', add one
+             raw += 'Z'; // this forces date to be parsed as a UTC date
+           }
 
-       function uiSectionOverlayList(context) {
+           var parsed = new Date(raw);
+           return new Date(parsed.toUTCString().substr(0, 25)); // convert to local timezone
+         }
 
-           var section = uiSection('overlay-list', context)
-               .title(_t('background.overlays'))
-               .disclosureContent(renderDisclosureContent);
+         function success(selection) {
+           var header = selection.append('div').attr('class', 'header fillL');
+           header.append('h3').html(_t.html('success.just_edited'));
+           header.append('button').attr('class', 'close').on('click', function () {
+             return dispatch$1.call('cancel');
+           }).call(svgIcon('#iD-icon-close'));
+           var body = selection.append('div').attr('class', 'body save-success fillL');
+           var summary = body.append('div').attr('class', 'save-summary');
+           summary.append('h3').html(_t.html('success.thank_you' + (_location ? '_location' : ''), {
+             where: _location
+           }));
+           summary.append('p').html(_t.html('success.help_html')).append('a').attr('class', 'link-out').attr('target', '_blank').attr('href', _t('success.help_link_url')).call(svgIcon('#iD-icon-out-link', 'inline')).append('span').html(_t.html('success.help_link_text'));
+           var osm = context.connection();
+           if (!osm) return;
+           var changesetURL = osm.changesetURL(_changeset.id);
+           var table = summary.append('table').attr('class', 'summary-table');
+           var row = table.append('tr').attr('class', 'summary-row');
+           row.append('td').attr('class', 'cell-icon summary-icon').append('a').attr('target', '_blank').attr('href', changesetURL).append('svg').attr('class', 'logo-small').append('use').attr('xlink:href', '#iD-logo-osm');
+           var summaryDetail = row.append('td').attr('class', 'cell-detail summary-detail');
+           summaryDetail.append('a').attr('class', 'cell-detail summary-view-on-osm').attr('target', '_blank').attr('href', changesetURL).html(_t.html('success.view_on_osm'));
+           summaryDetail.append('div').html(_t.html('success.changeset_id', {
+             changeset_id: "<a href=\"".concat(changesetURL, "\" target=\"_blank\">").concat(_changeset.id, "</a>")
+           })); // Get OSM community index features intersecting the map..
+
+           ensureOSMCommunityIndex().then(function (oci) {
+             var communities = [];
+             var properties = oci.query(context.map().center(), true) || []; // Gather the communities from the result
+
+             properties.forEach(function (props) {
+               var resourceIDs = Array.from(props.resourceIDs);
+               resourceIDs.forEach(function (resourceID) {
+                 var resource = oci.resources[resourceID];
+                 communities.push({
+                   area: props.area || Infinity,
+                   order: resource.order || 0,
+                   resource: resource
+                 });
+               });
+             }); // sort communities by feature area ascending, community order descending
 
-           var _overlayList = select(null);
+             communities.sort(function (a, b) {
+               return a.area - b.area || b.order - a.order;
+             });
+             body.call(showCommunityLinks, communities.map(function (c) {
+               return c.resource;
+             }));
+           });
+         }
 
-           function setTooltips(selection) {
-               selection.each(function(d, i, nodes) {
-                   var item = select(this).select('label');
-                   var span = item.select('span');
-                   var placement = (i < nodes.length / 2) ? 'bottom' : 'top';
-                   var description = d.description();
-                   var isOverflowing = (span.property('clientWidth') !== span.property('scrollWidth'));
+         function showCommunityLinks(selection, resources) {
+           var communityLinks = selection.append('div').attr('class', 'save-communityLinks');
+           communityLinks.append('h3').html(_t.html('success.like_osm'));
+           var table = communityLinks.append('table').attr('class', 'community-table');
+           var row = table.selectAll('.community-row').data(resources);
+           var rowEnter = row.enter().append('tr').attr('class', 'community-row');
+           rowEnter.append('td').attr('class', 'cell-icon community-icon').append('a').attr('target', '_blank').attr('href', function (d) {
+             return d.url;
+           }).append('svg').attr('class', 'logo-small').append('use').attr('xlink:href', function (d) {
+             return "#community-".concat(d.type);
+           });
+           var communityDetail = rowEnter.append('td').attr('class', 'cell-detail community-detail');
+           communityDetail.each(showCommunityDetails);
+           communityLinks.append('div').attr('class', 'community-missing').html(_t.html('success.missing')).append('a').attr('class', 'link-out').attr('target', '_blank').call(svgIcon('#iD-icon-out-link', 'inline')).attr('href', 'https://github.com/osmlab/osm-community-index/issues').append('span').html(_t.html('success.tell_us'));
+         }
 
-                   item.call(uiTooltip().destroyAny);
+         function showCommunityDetails(d) {
+           var selection = select(this);
+           var communityID = d.id;
+           var replacements = {
+             url: linkify(d.url),
+             signupUrl: linkify(d.signupUrl || d.url)
+           };
+           selection.append('div').attr('class', 'community-name').append('a').attr('target', '_blank').attr('href', d.url).html(_t.html("community.".concat(d.id, ".name")));
+           var descriptionHTML = _t.html("community.".concat(d.id, ".description"), replacements);
 
-                   if (description || isOverflowing) {
-                       item.call(uiTooltip()
-                           .placement(placement)
-                           .title(description || d.name())
-                       );
-                   }
-               });
+           if (d.type === 'reddit') {
+             // linkify subreddits  #4997
+             descriptionHTML = descriptionHTML.replace(/(\/r\/\w*\/*)/i, function (match) {
+               return linkify(d.url, match);
+             });
            }
 
-           function updateLayerSelections(selection) {
-               function active(d) {
-                   return context.background().showsLayer(d);
-               }
+           selection.append('div').attr('class', 'community-description').html(descriptionHTML);
 
-               selection.selectAll('li')
-                   .classed('active', active)
-                   .call(setTooltips)
-                   .selectAll('input')
-                   .property('checked', active);
+           if (d.extendedDescription || d.languageCodes && d.languageCodes.length) {
+             selection.append('div').call(uiDisclosure(context, "community-more-".concat(d.id), false).expanded(false).updatePreference(false).label(_t.html('success.more')).content(showMore));
            }
 
+           var nextEvents = (d.events || []).map(function (event) {
+             event.date = parseEventDate(event.when);
+             return event;
+           }).filter(function (event) {
+             // date is valid and future (or today)
+             var t = event.date.getTime();
+             var now = new Date().setHours(0, 0, 0, 0);
+             return !isNaN(t) && t >= now;
+           }).sort(function (a, b) {
+             // sort by date ascending
+             return a.date < b.date ? -1 : a.date > b.date ? 1 : 0;
+           }).slice(0, MAXEVENTS); // limit number of events shown
 
-           function chooseOverlay(d) {
-               event.preventDefault();
-               context.background().toggleOverlayLayer(d);
-               _overlayList.call(updateLayerSelections);
-               document.activeElement.blur();
+           if (nextEvents.length) {
+             selection.append('div').call(uiDisclosure(context, "community-events-".concat(d.id), false).expanded(false).updatePreference(false).label(_t.html('success.events')).content(showNextEvents)).select('.hide-toggle').append('span').attr('class', 'badge-text').html(nextEvents.length);
            }
 
-           function drawListItems(layerList, type, change, filter) {
-               var sources = context.background()
-                   .sources(context.map().extent(), context.map().zoom(), true)
-                   .filter(filter);
+           function showMore(selection) {
+             var more = selection.selectAll('.community-more').data([0]);
+             var moreEnter = more.enter().append('div').attr('class', 'community-more');
 
-               var layerLinks = layerList.selectAll('li')
-                   .data(sources, function(d) { return d.name(); });
+             if (d.extendedDescription) {
+               moreEnter.append('div').attr('class', 'community-extended-description').html(_t.html("community.".concat(d.id, ".extendedDescription"), replacements));
+             }
 
-               layerLinks.exit()
-                   .remove();
+             if (d.languageCodes && d.languageCodes.length) {
+               var languageList = d.languageCodes.map(function (code) {
+                 return _mainLocalizer.languageName(code);
+               }).join(', ');
+               moreEnter.append('div').attr('class', 'community-languages').html(_t.html('success.languages', {
+                 languages: languageList
+               }));
+             }
+           }
 
-               var enter = layerLinks.enter()
-                   .append('li');
+           function showNextEvents(selection) {
+             var events = selection.append('div').attr('class', 'community-events');
+             var item = events.selectAll('.community-event').data(nextEvents);
+             var itemEnter = item.enter().append('div').attr('class', 'community-event');
+             itemEnter.append('div').attr('class', 'community-event-name').append('a').attr('target', '_blank').attr('href', function (d) {
+               return d.url;
+             }).html(function (d) {
+               var name = d.name;
+
+               if (d.i18n && d.id) {
+                 name = _t("community.".concat(communityID, ".events.").concat(d.id, ".name"), {
+                   "default": name
+                 });
+               }
 
-               var label = enter
-                   .append('label');
+               return name;
+             });
+             itemEnter.append('div').attr('class', 'community-event-when').html(function (d) {
+               var options = {
+                 weekday: 'short',
+                 day: 'numeric',
+                 month: 'short',
+                 year: 'numeric'
+               };
 
-               label
-                   .append('input')
-                   .attr('type', type)
-                   .attr('name', 'layers')
-                   .on('change', change);
+               if (d.date.getHours() || d.date.getMinutes()) {
+                 // include time if it has one
+                 options.hour = 'numeric';
+                 options.minute = 'numeric';
+               }
 
-               label
-                   .append('span')
-                   .text(function(d) { return d.name(); });
+               return d.date.toLocaleString(_mainLocalizer.localeCode(), options);
+             });
+             itemEnter.append('div').attr('class', 'community-event-where').html(function (d) {
+               var where = d.where;
 
+               if (d.i18n && d.id) {
+                 where = _t("community.".concat(communityID, ".events.").concat(d.id, ".where"), {
+                   "default": where
+                 });
+               }
 
-               layerList.selectAll('li')
-                   .sort(sortSources);
+               return where;
+             });
+             itemEnter.append('div').attr('class', 'community-event-description').html(function (d) {
+               var description = d.description;
 
-               layerList
-                   .call(updateLayerSelections);
+               if (d.i18n && d.id) {
+                 description = _t("community.".concat(communityID, ".events.").concat(d.id, ".description"), {
+                   "default": description
+                 });
+               }
 
+               return description;
+             });
+           }
 
-               function sortSources(a, b) {
-                   return a.best() && !b.best() ? -1
-                       : b.best() && !a.best() ? 1
-                       : d3_descending(a.area(), b.area()) || d3_ascending(a.name(), b.name()) || 0;
-               }
+           function linkify(url, text) {
+             text = text || url;
+             return "<a target=\"_blank\" href=\"".concat(url, "\">").concat(text, "</a>");
            }
+         }
 
-           function renderDisclosureContent(selection) {
+         success.changeset = function (val) {
+           if (!arguments.length) return _changeset;
+           _changeset = val;
+           return success;
+         };
 
-               var container = selection.selectAll('.layer-overlay-list')
-                   .data([0]);
+         success.location = function (val) {
+           if (!arguments.length) return _location;
+           _location = val;
+           return success;
+         };
 
-               _overlayList = container.enter()
-                   .append('ul')
-                   .attr('class', 'layer-list layer-overlay-list')
-                   .attr('dir', 'auto')
-                   .merge(container);
+         return utilRebind(success, dispatch$1, 'on');
+       }
 
-               _overlayList
-                   .call(drawListItems, 'checkbox', chooseOverlay, function(d) { return !d.isHidden() && d.overlay; });
-           }
+       function modeSave(context) {
+         var mode = {
+           id: 'save'
+         };
+         var keybinding = utilKeybinding('modeSave');
+         var commit = uiCommit(context).on('cancel', cancel);
 
-           context.map()
-               .on('move.overlay_list',
-                   debounce(function() {
-                       // layers in-view may have changed due to map move
-                       window.requestIdleCallback(section.reRender);
-                   }, 1000)
-               );
+         var _conflictsUi; // uiConflicts
 
-           return section;
-       }
 
-       function uiPaneBackground(context) {
+         var _location;
 
-           var backgroundPane = uiPane('background', context)
-               .key(_t('background.key'))
-               .title(_t('background.title'))
-               .description(_t('background.description'))
-               .iconName('iD-icon-layers')
-               .sections([
-                   uiSectionBackgroundList(context),
-                   uiSectionOverlayList(context),
-                   uiSectionBackgroundDisplayOptions(context),
-                   uiSectionBackgroundOffset(context)
-               ]);
+         var _success;
 
-           return backgroundPane;
-       }
+         var uploader = context.uploader().on('saveStarted.modeSave', function () {
+           keybindingOff();
+         }) // fire off some async work that we want to be ready later
+         .on('willAttemptUpload.modeSave', prepareForSuccess).on('progressChanged.modeSave', showProgress).on('resultNoChanges.modeSave', function () {
+           cancel();
+         }).on('resultErrors.modeSave', showErrors).on('resultConflicts.modeSave', showConflicts).on('resultSuccess.modeSave', showSuccess);
 
-       function uiPaneHelp(context) {
+         function cancel() {
+           context.enter(modeBrowse(context));
+         }
 
-           var docKeys = [
-               ['help', [
-                   'welcome',
-                   'open_data_h',
-                   'open_data',
-                   'before_start_h',
-                   'before_start',
-                   'open_source_h',
-                   'open_source',
-                   'open_source_help'
-               ]],
-               ['overview', [
-                   'navigation_h',
-                   'navigation_drag',
-                   'navigation_zoom',
-                   'features_h',
-                   'features',
-                   'nodes_ways'
-               ]],
-               ['editing', [
-                   'select_h',
-                   'select_left_click',
-                   'select_right_click',
-                   'select_space',
-                   'multiselect_h',
-                   'multiselect',
-                   'multiselect_shift_click',
-                   'multiselect_lasso',
-                   'undo_redo_h',
-                   'undo_redo',
-                   'save_h',
-                   'save',
-                   'save_validation',
-                   'upload_h',
-                   'upload',
-                   'backups_h',
-                   'backups',
-                   'keyboard_h',
-                   'keyboard'
-               ]],
-               ['feature_editor', [
-                   'intro',
-                   'definitions',
-                   'type_h',
-                   'type',
-                   'type_picker',
-                   'fields_h',
-                   'fields_all_fields',
-                   'fields_example',
-                   'fields_add_field',
-                   'tags_h',
-                   'tags_all_tags',
-                   'tags_resources'
-               ]],
-               ['points', [
-                   'intro',
-                   'add_point_h',
-                   'add_point',
-                   'add_point_finish',
-                   'move_point_h',
-                   'move_point',
-                   'delete_point_h',
-                   'delete_point',
-                   'delete_point_command'
-               ]],
-               ['lines', [
-                   'intro',
-                   'add_line_h',
-                   'add_line',
-                   'add_line_draw',
-                   'add_line_continue',
-                   'add_line_finish',
-                   'modify_line_h',
-                   'modify_line_dragnode',
-                   'modify_line_addnode',
-                   'connect_line_h',
-                   'connect_line',
-                   'connect_line_display',
-                   'connect_line_drag',
-                   'connect_line_tag',
-                   'disconnect_line_h',
-                   'disconnect_line_command',
-                   'move_line_h',
-                   'move_line_command',
-                   'move_line_connected',
-                   'delete_line_h',
-                   'delete_line',
-                   'delete_line_command'
-               ]],
-               ['areas', [
-                   'intro',
-                   'point_or_area_h',
-                   'point_or_area',
-                   'add_area_h',
-                   'add_area_command',
-                   'add_area_draw',
-                   'add_area_continue',
-                   'add_area_finish',
-                   'square_area_h',
-                   'square_area_command',
-                   'modify_area_h',
-                   'modify_area_dragnode',
-                   'modify_area_addnode',
-                   'delete_area_h',
-                   'delete_area',
-                   'delete_area_command'
-               ]],
-               ['relations', [
-                   'intro',
-                   'edit_relation_h',
-                   'edit_relation',
-                   'edit_relation_add',
-                   'edit_relation_delete',
-                   'maintain_relation_h',
-                   'maintain_relation',
-                   'relation_types_h',
-                   'multipolygon_h',
-                   'multipolygon',
-                   'multipolygon_create',
-                   'multipolygon_merge',
-                   'turn_restriction_h',
-                   'turn_restriction',
-                   'turn_restriction_field',
-                   'turn_restriction_editing',
-                   'route_h',
-                   'route',
-                   'route_add',
-                   'boundary_h',
-                   'boundary',
-                   'boundary_add'
-               ]],
-               ['notes', [
-                   'intro',
-                   'add_note_h',
-                   'add_note',
-                   'place_note',
-                   'move_note',
-                   'update_note_h',
-                   'update_note',
-                   'save_note_h',
-                   'save_note'
-               ]],
-               ['imagery', [
-                   'intro',
-                   'sources_h',
-                   'choosing',
-                   'sources',
-                   'offsets_h',
-                   'offset',
-                   'offset_change'
-               ]],
-               ['streetlevel', [
-                   'intro',
-                   'using_h',
-                   'using',
-                   'photos',
-                   'viewer'
-               ]],
-               ['gps', [
-                   'intro',
-                   'survey',
-                   'using_h',
-                   'using',
-                   'tracing',
-                   'upload'
-               ]],
-               ['qa', [
-                   'intro',
-                   'tools_h',
-                   'tools',
-                   'issues_h',
-                   'issues'
-               ]]
-           ];
-
-           var headings = {
-               'help.help.open_data_h': 3,
-               'help.help.before_start_h': 3,
-               'help.help.open_source_h': 3,
-               'help.overview.navigation_h': 3,
-               'help.overview.features_h': 3,
-               'help.editing.select_h': 3,
-               'help.editing.multiselect_h': 3,
-               'help.editing.undo_redo_h': 3,
-               'help.editing.save_h': 3,
-               'help.editing.upload_h': 3,
-               'help.editing.backups_h': 3,
-               'help.editing.keyboard_h': 3,
-               'help.feature_editor.type_h': 3,
-               'help.feature_editor.fields_h': 3,
-               'help.feature_editor.tags_h': 3,
-               'help.points.add_point_h': 3,
-               'help.points.move_point_h': 3,
-               'help.points.delete_point_h': 3,
-               'help.lines.add_line_h': 3,
-               'help.lines.modify_line_h': 3,
-               'help.lines.connect_line_h': 3,
-               'help.lines.disconnect_line_h': 3,
-               'help.lines.move_line_h': 3,
-               'help.lines.delete_line_h': 3,
-               'help.areas.point_or_area_h': 3,
-               'help.areas.add_area_h': 3,
-               'help.areas.square_area_h': 3,
-               'help.areas.modify_area_h': 3,
-               'help.areas.delete_area_h': 3,
-               'help.relations.edit_relation_h': 3,
-               'help.relations.maintain_relation_h': 3,
-               'help.relations.relation_types_h': 2,
-               'help.relations.multipolygon_h': 3,
-               'help.relations.turn_restriction_h': 3,
-               'help.relations.route_h': 3,
-               'help.relations.boundary_h': 3,
-               'help.notes.add_note_h': 3,
-               'help.notes.update_note_h': 3,
-               'help.notes.save_note_h': 3,
-               'help.imagery.sources_h': 3,
-               'help.imagery.offsets_h': 3,
-               'help.streetlevel.using_h': 3,
-               'help.gps.using_h': 3,
-               'help.qa.tools_h': 3,
-               'help.qa.issues_h': 3
-           };
+         function showProgress(num, total) {
+           var modal = context.container().select('.loading-modal .modal-section');
+           var progress = modal.selectAll('.progress').data([0]); // enter/update
+
+           progress.enter().append('div').attr('class', 'progress').merge(progress).text(_t('save.conflict_progress', {
+             num: num,
+             total: total
+           }));
+         }
+
+         function showConflicts(changeset, conflicts, origChanges) {
+           var selection = context.container().select('.sidebar').append('div').attr('class', 'sidebar-component');
+           context.container().selectAll('.main-content').classed('active', true).classed('inactive', false);
+           _conflictsUi = uiConflicts(context).conflictList(conflicts).origChanges(origChanges).on('cancel', function () {
+             context.container().selectAll('.main-content').classed('active', false).classed('inactive', true);
+             selection.remove();
+             keybindingOn();
+             uploader.cancelConflictResolution();
+           }).on('save', function () {
+             context.container().selectAll('.main-content').classed('active', false).classed('inactive', true);
+             selection.remove();
+             uploader.processResolvedConflicts(changeset);
+           });
+           selection.call(_conflictsUi);
+         }
+
+         function showErrors(errors) {
+           keybindingOn();
+           var selection = uiConfirm(context.container());
+           selection.select('.modal-section.header').append('h3').text(_t('save.error'));
+           addErrors(selection, errors);
+           selection.okButton();
+         }
+
+         function addErrors(selection, data) {
+           var message = selection.select('.modal-section.message-text');
+           var items = message.selectAll('.error-container').data(data);
+           var enter = items.enter().append('div').attr('class', 'error-container');
+           enter.append('a').attr('class', 'error-description').attr('href', '#').classed('hide-toggle', true).text(function (d) {
+             return d.msg || _t('save.unknown_error_details');
+           }).on('click', function (d3_event) {
+             d3_event.preventDefault();
+             var error = select(this);
+             var detail = select(this.nextElementSibling);
+             var exp = error.classed('expanded');
+             detail.style('display', exp ? 'none' : 'block');
+             error.classed('expanded', !exp);
+           });
+           var details = enter.append('div').attr('class', 'error-detail-container').style('display', 'none');
+           details.append('ul').attr('class', 'error-detail-list').selectAll('li').data(function (d) {
+             return d.details || [];
+           }).enter().append('li').attr('class', 'error-detail-item').text(function (d) {
+             return d;
+           });
+           items.exit().remove();
+         }
 
-           // For each section, squash all the texts into a single markdown document
-           var docs = docKeys.map(function(key) {
-               var helpkey = 'help.' + key[0];
-               var helpPaneReplacements = { version: context.version };
-               var text = key[1].reduce(function(all, part) {
-                   var subkey = helpkey + '.' + part;
-                   var depth = headings[subkey];                              // is this subkey a heading?
-                   var hhh = depth ? Array(depth + 1).join('#') + ' ' : '';   // if so, prepend with some ##'s
-                   return all + hhh + helpString(subkey, helpPaneReplacements) + '\n\n';
-               }, '');
+         function showSuccess(changeset) {
+           commit.reset();
 
-               return {
-                   title: _t(helpkey + '.title'),
-                   html: marked_1(text.trim())
-                       // use keyboard key styling for shortcuts
-                       .replace(/<code>/g, '<kbd>')
-                       .replace(/<\/code>/g, '<\/kbd>')
-               };
+           var ui = _success.changeset(changeset).location(_location).on('cancel', function () {
+             context.ui().sidebar.hide();
            });
 
-           var helpPane = uiPane('help', context)
-               .key(_t('help.key'))
-               .title(_t('help.title'))
-               .description(_t('help.title'))
-               .iconName('iD-icon-help');
+           context.enter(modeBrowse(context).sidebar(ui));
+         }
 
-           helpPane.renderContent = function(content) {
+         function keybindingOn() {
+           select(document).call(keybinding.on('⎋', cancel, true));
+         }
 
-               function clickHelp(d, i) {
-                   var rtl = (_mainLocalizer.textDirection() === 'rtl');
-                   content.property('scrollTop', 0);
-                   helpPane.selection().select('.pane-heading h2').html(d.title);
+         function keybindingOff() {
+           select(document).call(keybinding.unbind);
+         } // Reverse geocode current map location so we can display a message on
+         // the success screen like "Thank you for editing around place, region."
 
-                   body.html(d.html);
-                   body.selectAll('a')
-                       .attr('target', '_blank');
-                   menuItems.classed('selected', function(m) {
-                       return m.title === d.title;
-                   });
 
-                   nav.html('');
-                   if (rtl) {
-                       nav.call(drawNext).call(drawPrevious);
-                   } else {
-                       nav.call(drawPrevious).call(drawNext);
-                   }
+         function prepareForSuccess() {
+           _success = uiSuccess(context);
+           _location = null;
+           if (!services.geocoder) return;
+           services.geocoder.reverse(context.map().center(), function (err, result) {
+             if (err || !result || !result.address) return;
+             var addr = result.address;
+             var place = addr && (addr.town || addr.city || addr.county) || '';
+             var region = addr && (addr.state || addr.country) || '';
+             var separator = place && region ? _t('success.thank_you_where.separator') : '';
+             _location = _t('success.thank_you_where.format', {
+               place: place,
+               separator: separator,
+               region: region
+             });
+           });
+         }
 
+         mode.selectedIDs = function () {
+           return _conflictsUi ? _conflictsUi.shownEntityIds() : [];
+         };
 
-                   function drawNext(selection) {
-                       if (i < docs.length - 1) {
-                           var nextLink = selection
-                               .append('a')
-                               .attr('class', 'next')
-                               .on('click', function() {
-                                   clickHelp(docs[i + 1], i + 1);
-                               });
+         mode.enter = function () {
+           // Show sidebar
+           context.ui().sidebar.expand();
 
-                           nextLink
-                               .append('span')
-                               .text(docs[i + 1].title)
-                               .call(svgIcon((rtl ? '#iD-icon-backward' : '#iD-icon-forward'), 'inline'));
-                       }
-                   }
+           function done() {
+             context.ui().sidebar.show(commit);
+           }
 
+           keybindingOn();
+           context.container().selectAll('.main-content').classed('active', false).classed('inactive', true);
+           var osm = context.connection();
 
-                   function drawPrevious(selection) {
-                       if (i > 0) {
-                           var prevLink = selection
-                               .append('a')
-                               .attr('class', 'previous')
-                               .on('click', function() {
-                                   clickHelp(docs[i - 1], i - 1);
-                               });
+           if (!osm) {
+             cancel();
+             return;
+           }
 
-                           prevLink
-                               .call(svgIcon((rtl ? '#iD-icon-forward' : '#iD-icon-backward'), 'inline'))
-                               .append('span')
-                               .text(docs[i - 1].title);
-                       }
-                   }
+           if (osm.authenticated()) {
+             done();
+           } else {
+             osm.authenticate(function (err) {
+               if (err) {
+                 cancel();
+               } else {
+                 done();
                }
+             });
+           }
+         };
+
+         mode.exit = function () {
+           keybindingOff();
+           context.container().selectAll('.main-content').classed('active', true).classed('inactive', false);
+           context.ui().sidebar.hide();
+         };
 
+         return mode;
+       }
 
-               function clickWalkthrough() {
-                   if (context.inIntro()) return;
-                   context.container().call(uiIntro(context));
-                   context.ui().togglePanes();
-               }
+       function uiToolOldDrawModes(context) {
+         var tool = {
+           id: 'old_modes',
+           label: _t.html('toolbar.add_feature')
+         };
+         var modes = [modeAddPoint(context, {
+           title: _t.html('modes.add_point.title'),
+           button: 'point',
+           description: _t.html('modes.add_point.description'),
+           preset: _mainPresetIndex.item('point'),
+           key: '1'
+         }), modeAddLine(context, {
+           title: _t.html('modes.add_line.title'),
+           button: 'line',
+           description: _t.html('modes.add_line.description'),
+           preset: _mainPresetIndex.item('line'),
+           key: '2'
+         }), modeAddArea(context, {
+           title: _t.html('modes.add_area.title'),
+           button: 'area',
+           description: _t.html('modes.add_area.description'),
+           preset: _mainPresetIndex.item('area'),
+           key: '3'
+         })];
+
+         function enabled() {
+           return osmEditable();
+         }
+
+         function osmEditable() {
+           return context.editable();
+         }
+
+         modes.forEach(function (mode) {
+           context.keybinding().on(mode.key, function () {
+             if (!enabled()) return;
+
+             if (mode.id === context.mode().id) {
+               context.enter(modeBrowse(context));
+             } else {
+               context.enter(mode);
+             }
+           });
+         });
 
+         tool.render = function (selection) {
+           var wrap = selection.append('div').attr('class', 'joined').style('display', 'flex');
 
-               function clickShortcuts() {
-                   context.container().call(uiShortcuts(context), true);
-               }
+           var debouncedUpdate = debounce(update, 500, {
+             leading: true,
+             trailing: true
+           });
 
-               var toc = content
-                   .append('ul')
-                   .attr('class', 'toc');
+           context.map().on('move.modes', debouncedUpdate).on('drawn.modes', debouncedUpdate);
+           context.on('enter.modes', update);
+           update();
 
-               var menuItems = toc.selectAll('li')
-                   .data(docs)
-                   .enter()
-                   .append('li')
-                   .append('a')
-                   .html(function(d) { return d.title; })
-                   .on('click', clickHelp);
-
-               var shortcuts = toc
-                   .append('li')
-                   .attr('class', 'shortcuts')
-                   .call(uiTooltip()
-                       .title(_t('shortcuts.tooltip'))
-                       .keys(['?'])
-                       .placement('top')
-                   )
-                   .append('a')
-                   .on('click', clickShortcuts);
-
-               shortcuts
-                   .append('div')
-                   .text(_t('shortcuts.title'));
+           function update() {
+             var buttons = wrap.selectAll('button.add-button').data(modes, function (d) {
+               return d.id;
+             }); // exit
 
-               var walkthrough = toc
-                   .append('li')
-                   .attr('class', 'walkthrough')
-                   .append('a')
-                   .on('click', clickWalkthrough);
+             buttons.exit().remove(); // enter
 
-               walkthrough
-                   .append('svg')
-                   .attr('class', 'logo logo-walkthrough')
-                   .append('use')
-                   .attr('xlink:href', '#iD-logo-walkthrough');
+             var buttonsEnter = buttons.enter().append('button').attr('class', function (d) {
+               return d.id + ' add-button bar-button';
+             }).on('click.mode-buttons', function (d3_event, d) {
+               if (!enabled()) return; // When drawing, ignore accidental clicks on mode buttons - #4042
 
-               walkthrough
-                   .append('div')
-                   .text(_t('splash.walkthrough'));
+               var currMode = context.mode().id;
+               if (/^draw/.test(currMode)) return;
 
+               if (d.id === currMode) {
+                 context.enter(modeBrowse(context));
+               } else {
+                 context.enter(d);
+               }
+             }).call(uiTooltip().placement('bottom').title(function (d) {
+               return d.description;
+             }).keys(function (d) {
+               return [d.key];
+             }).scrollContainer(context.container().select('.top-toolbar')));
+             buttonsEnter.each(function (d) {
+               select(this).call(svgIcon('#iD-icon-' + d.button));
+             });
+             buttonsEnter.append('span').attr('class', 'label').html(function (mode) {
+               return mode.title;
+             }); // if we are adding/removing the buttons, check if toolbar has overflowed
 
-               var helpContent = content
-                   .append('div')
-                   .attr('class', 'left-content');
+             if (buttons.enter().size() || buttons.exit().size()) {
+               context.ui().checkOverflow('.top-toolbar', true);
+             } // update
 
-               var body = helpContent
-                   .append('div')
-                   .attr('class', 'body');
 
-               var nav = helpContent
-                   .append('div')
-                   .attr('class', 'nav');
+             buttons = buttons.merge(buttonsEnter).classed('disabled', function (d) {
+               return !enabled();
+             }).classed('active', function (d) {
+               return context.mode() && context.mode().button === d.button;
+             });
+           }
+         };
 
-               clickHelp(docs[0], 0);
+         return tool;
+       }
 
-           };
+       function uiToolNotes(context) {
+         var tool = {
+           id: 'notes',
+           label: _t.html('modes.add_note.label')
+         };
+         var mode = modeAddNote(context);
 
-           return helpPane;
-       }
+         function enabled() {
+           return notesEnabled() && notesEditable();
+         }
 
-       function uiSectionValidationIssues(id, severity, context) {
+         function notesEnabled() {
+           var noteLayer = context.layers().layer('notes');
+           return noteLayer && noteLayer.enabled();
+         }
 
-           var _issues = [];
+         function notesEditable() {
+           var mode = context.mode();
+           return context.map().notesEditable() && mode && mode.id !== 'save';
+         }
 
-           var section = uiSection(id, context)
-               .title(function() {
-                   if (!_issues) return '';
-                   var issueCountText = _issues.length > 1000 ? '1000+' : String(_issues.length);
-                   return _t('issues.' + severity + 's.list_title', { count: issueCountText });
-               })
-               .disclosureContent(renderDisclosureContent)
-               .shouldDisplay(function() {
-                   return _issues && _issues.length;
-               });
+         context.keybinding().on(mode.key, function () {
+           if (!enabled()) return;
 
-           function getOptions() {
-               return {
-                   what: corePreferences('validate-what') || 'edited',
-                   where: corePreferences('validate-where') || 'all'
-               };
+           if (mode.id === context.mode().id) {
+             context.enter(modeBrowse(context));
+           } else {
+             context.enter(mode);
            }
+         });
 
-           // get and cache the issues to display, unordered
-           function reloadIssues() {
-               _issues = context.validator().getIssuesBySeverity(getOptions())[severity];
-           }
+         tool.render = function (selection) {
+           var debouncedUpdate = debounce(update, 500, {
+             leading: true,
+             trailing: true
+           });
 
-           function renderDisclosureContent(selection) {
+           context.map().on('move.notes', debouncedUpdate).on('drawn.notes', debouncedUpdate);
+           context.on('enter.notes', update);
+           update();
 
-               var center = context.map().center();
-               var graph = context.graph();
+           function update() {
+             var showNotes = notesEnabled();
+             var data = showNotes ? [mode] : [];
+             var buttons = selection.selectAll('button.add-button').data(data, function (d) {
+               return d.id;
+             }); // exit
 
-               // sort issues by distance away from the center of the map
-               var issues = _issues.map(function withDistance(issue) {
-                       var extent = issue.extent(graph);
-                       var dist = extent ? geoSphericalDistance(center, extent.center()) : 0;
-                       return Object.assign(issue, { dist: dist });
-                   })
-                   .sort(function byDistance(a, b) {
-                       return a.dist - b.dist;
-                   });
+             buttons.exit().remove(); // enter
 
-               // cut off at 1000
-               issues = issues.slice(0, 1000);
+             var buttonsEnter = buttons.enter().append('button').attr('class', function (d) {
+               return d.id + ' add-button bar-button';
+             }).on('click.notes', function (d3_event, d) {
+               if (!enabled()) return; // When drawing, ignore accidental clicks on mode buttons - #4042
 
-               //renderIgnoredIssuesReset(_warningsSelection);
+               var currMode = context.mode().id;
+               if (/^draw/.test(currMode)) return;
 
-               selection
-                   .call(drawIssuesList, issues);
+               if (d.id === currMode) {
+                 context.enter(modeBrowse(context));
+               } else {
+                 context.enter(d);
+               }
+             }).call(uiTooltip().placement('bottom').title(function (d) {
+               return d.description;
+             }).keys(function (d) {
+               return [d.key];
+             }).scrollContainer(context.container().select('.top-toolbar')));
+             buttonsEnter.each(function (d) {
+               select(this).call(svgIcon(d.icon || '#iD-icon-' + d.button));
+             }); // if we are adding/removing the buttons, check if toolbar has overflowed
+
+             if (buttons.enter().size() || buttons.exit().size()) {
+               context.ui().checkOverflow('.top-toolbar', true);
+             } // update
+
+
+             buttons = buttons.merge(buttonsEnter).classed('disabled', function (d) {
+               return !enabled();
+             }).classed('active', function (d) {
+               return context.mode() && context.mode().button === d.button;
+             });
            }
+         };
 
-           function drawIssuesList(selection, issues) {
-               var list = selection.selectAll('.issues-list')
-                   .data([0]);
-
-               list = list.enter()
-                   .append('ul')
-                   .attr('class', 'layer-list issues-list ' + severity + 's-list')
-                   .merge(list);
-
+         tool.uninstall = function () {
+           context.on('enter.editor.notes', null).on('exit.editor.notes', null).on('enter.notes', null);
+           context.map().on('move.notes', null).on('drawn.notes', null);
+         };
 
-               var items = list.selectAll('li')
-                   .data(issues, function(d) { return d.id; });
+         return tool;
+       }
 
-               // Exit
-               items.exit()
-                   .remove();
+       function uiToolSave(context) {
+         var tool = {
+           id: 'save',
+           label: _t.html('save.title')
+         };
+         var button = null;
+         var tooltipBehavior = null;
+         var history = context.history();
+         var key = uiCmd('⌘S');
+         var _numChanges = 0;
 
-               // Enter
-               var itemsEnter = items.enter()
-                   .append('li')
-                   .attr('class', function (d) { return 'issue severity-' + d.severity; })
-                   .on('click', function(d) {
-                       context.validator().focusIssue(d);
-                   })
-                   .on('mouseover', function(d) {
-                       utilHighlightEntities(d.entityIds, true, context);
-                   })
-                   .on('mouseout', function(d) {
-                       utilHighlightEntities(d.entityIds, false, context);
-                   });
+         function isSaving() {
+           var mode = context.mode();
+           return mode && mode.id === 'save';
+         }
 
+         function isDisabled() {
+           return _numChanges === 0 || isSaving();
+         }
 
-               var labelsEnter = itemsEnter
-                   .append('div')
-                   .attr('class', 'issue-label');
-
-               var textEnter = labelsEnter
-                   .append('span')
-                   .attr('class', 'issue-text');
-
-               textEnter
-                   .append('span')
-                   .attr('class', 'issue-icon')
-                   .each(function(d) {
-                       var iconName = '#iD-icon-' + (d.severity === 'warning' ? 'alert' : 'error');
-                       select(this)
-                           .call(svgIcon(iconName));
-                   });
+         function save(d3_event) {
+           d3_event.preventDefault();
 
-               textEnter
-                   .append('span')
-                   .attr('class', 'issue-message');
+           if (!context.inIntro() && !isSaving() && history.hasChanges()) {
+             context.enter(modeSave(context));
+           }
+         }
 
-               /*
-               labelsEnter
-                   .append('span')
-                   .attr('class', 'issue-autofix')
-                   .each(function(d) {
-                       if (!d.autoFix) return;
-
-                       d3_select(this)
-                           .append('button')
-                           .attr('title', t('issues.fix_one.title'))
-                           .datum(d.autoFix)  // set button datum to the autofix
-                           .attr('class', 'autofix action')
-                           .on('click', function(d) {
-                               d3_event.preventDefault();
-                               d3_event.stopPropagation();
-
-                               var issuesEntityIDs = d.issue.entityIds;
-                               utilHighlightEntities(issuesEntityIDs.concat(d.entityIds), false, context);
-
-                               context.perform.apply(context, d.autoArgs);
-                               context.validator().validate();
-                           })
-                           .call(svgIcon('#iD-icon-wrench'));
-                   });
-               */
+         function bgColor() {
+           var step;
 
-               // Update
-               items = items
-                   .merge(itemsEnter)
-                   .order();
+           if (_numChanges === 0) {
+             return null;
+           } else if (_numChanges <= 50) {
+             step = _numChanges / 50;
+             return d3_interpolateRgb('#fff', '#ff8')(step); // white -> yellow
+           } else {
+             step = Math.min((_numChanges - 50) / 50, 1.0);
+             return d3_interpolateRgb('#ff8', '#f88')(step); // yellow -> red
+           }
+         }
 
-               items.selectAll('.issue-message')
-                   .text(function(d) {
-                       return d.message(context);
-                   });
+         function updateCount() {
+           var val = history.difference().summary().length;
+           if (val === _numChanges) return;
+           _numChanges = val;
 
-               /*
-               // autofix
-               var canAutoFix = issues.filter(function(issue) { return issue.autoFix; });
-
-               var autoFixAll = selection.selectAll('.autofix-all')
-                   .data(canAutoFix.length ? [0] : []);
-
-               // exit
-               autoFixAll.exit()
-                   .remove();
-
-               // enter
-               var autoFixAllEnter = autoFixAll.enter()
-                   .insert('div', '.issues-list')
-                   .attr('class', 'autofix-all');
-
-               var linkEnter = autoFixAllEnter
-                   .append('a')
-                   .attr('class', 'autofix-all-link')
-                   .attr('href', '#');
-
-               linkEnter
-                   .append('span')
-                   .attr('class', 'autofix-all-link-text')
-                   .text(t('issues.fix_all.title'));
-
-               linkEnter
-                   .append('span')
-                   .attr('class', 'autofix-all-link-icon')
-                   .call(svgIcon('#iD-icon-wrench'));
-
-               if (severity === 'warning') {
-                   renderIgnoredIssuesReset(selection);
-               }
-
-               // update
-               autoFixAll = autoFixAll
-                   .merge(autoFixAllEnter);
-
-               autoFixAll.selectAll('.autofix-all-link')
-                   .on('click', function() {
-                       context.pauseChangeDispatch();
-                       context.perform(actionNoop());
-                       canAutoFix.forEach(function(issue) {
-                           var args = issue.autoFix.autoArgs.slice();  // copy
-                           if (typeof args[args.length - 1] !== 'function') {
-                               args.pop();
-                           }
-                           args.push(t('issues.fix_all.annotation'));
-                           context.replace.apply(context, args);
-                       });
-                       context.resumeChangeDispatch();
-                       context.validator().validate();
-                   });
-               */
+           if (tooltipBehavior) {
+             tooltipBehavior.title(_t.html(_numChanges > 0 ? 'save.help' : 'save.no_changes')).keys([key]);
            }
 
-           context.validator().on('validated.uiSectionValidationIssues' + id, function() {
-               window.requestIdleCallback(function() {
-                   reloadIssues();
-                   section.reRender();
-               });
-           });
+           if (button) {
+             button.classed('disabled', isDisabled()).style('background', bgColor());
+             button.select('span.count').html(_numChanges);
+           }
+         }
 
-           context.map().on('move.uiSectionValidationIssues' + id,
-               debounce(function() {
-                   window.requestIdleCallback(function() {
-                       if (getOptions().where === 'visible') {
-                           // must refetch issues if they are viewport-dependent
-                           reloadIssues();
-                       }
-                       // always reload list to re-sort-by-distance
-                       section.reRender();
-                   });
-               }, 1000)
-           );
+         tool.render = function (selection) {
+           tooltipBehavior = uiTooltip().placement('bottom').title(_t.html('save.no_changes')).keys([key]).scrollContainer(context.container().select('.top-toolbar'));
+           var lastPointerUpType;
+           button = selection.append('button').attr('class', 'save disabled bar-button').on('pointerup', function (d3_event) {
+             lastPointerUpType = d3_event.pointerType;
+           }).on('click', function (d3_event) {
+             save(d3_event);
 
-           return section;
-       }
+             if (_numChanges === 0 && (lastPointerUpType === 'touch' || lastPointerUpType === 'pen')) {
+               // there are no tooltips for touch interactions so flash feedback instead
+               context.ui().flash.duration(2000).iconName('#iD-icon-save').iconClass('disabled').label(_t.html('save.no_changes'))();
+             }
 
-       function uiSectionValidationOptions(context) {
+             lastPointerUpType = null;
+           }).call(tooltipBehavior);
+           button.call(svgIcon('#iD-icon-save'));
+           button.append('span').attr('class', 'count').attr('aria-hidden', 'true').html('0');
+           updateCount();
+           context.keybinding().on(key, save, true);
+           context.history().on('change.save', updateCount);
+           context.on('enter.save', function () {
+             if (button) {
+               button.classed('disabled', isDisabled());
 
-           var section = uiSection('issues-options', context)
-               .content(renderContent);
+               if (isSaving()) {
+                 button.call(tooltipBehavior.hide);
+               }
+             }
+           });
+         };
 
-           function renderContent(selection) {
+         tool.uninstall = function () {
+           context.keybinding().off(key, true);
+           context.history().on('change.save', null);
+           context.on('enter.save', null);
+           button = null;
+           tooltipBehavior = null;
+         };
 
-               var container = selection.selectAll('.issues-options-container')
-                   .data([0]);
+         return tool;
+       }
 
-               container = container.enter()
-                   .append('div')
-                   .attr('class', 'issues-options-container')
-                   .merge(container);
+       function uiToolSidebarToggle(context) {
+         var tool = {
+           id: 'sidebar_toggle',
+           label: _t.html('toolbar.inspect')
+         };
 
-               var data = [
-                   { key: 'what', values: ['edited', 'all'] },
-                   { key: 'where', values: ['visible', 'all'] }
-               ];
+         tool.render = function (selection) {
+           selection.append('button').attr('class', 'bar-button').on('click', function () {
+             context.ui().sidebar.toggle();
+           }).call(uiTooltip().placement('bottom').title(_t.html('sidebar.tooltip')).keys([_t('sidebar.key')]).scrollContainer(context.container().select('.top-toolbar'))).call(svgIcon('#iD-icon-sidebar-' + (_mainLocalizer.textDirection() === 'rtl' ? 'right' : 'left')));
+         };
 
-               var options = container.selectAll('.issues-option')
-                   .data(data, function(d) { return d.key; });
+         return tool;
+       }
 
-               var optionsEnter = options.enter()
-                   .append('div')
-                   .attr('class', function(d) { return 'issues-option issues-option-' + d.key; });
+       function uiToolUndoRedo(context) {
+         var tool = {
+           id: 'undo_redo',
+           label: _t.html('toolbar.undo_redo')
+         };
+         var commands = [{
+           id: 'undo',
+           cmd: uiCmd('⌘Z'),
+           action: function action() {
+             context.undo();
+           },
+           annotation: function annotation() {
+             return context.history().undoAnnotation();
+           },
+           icon: 'iD-icon-' + (_mainLocalizer.textDirection() === 'rtl' ? 'redo' : 'undo')
+         }, {
+           id: 'redo',
+           cmd: uiCmd('⌘⇧Z'),
+           action: function action() {
+             context.redo();
+           },
+           annotation: function annotation() {
+             return context.history().redoAnnotation();
+           },
+           icon: 'iD-icon-' + (_mainLocalizer.textDirection() === 'rtl' ? 'undo' : 'redo')
+         }];
 
-               optionsEnter
-                   .append('div')
-                   .attr('class', 'issues-option-title')
-                   .text(function(d) { return _t('issues.options.' + d.key + '.title'); });
+         function editable() {
+           return context.mode() && context.mode().id !== 'save' && context.map().editableDataEnabled(true
+           /* ignore min zoom */
+           );
+         }
 
-               var valuesEnter = optionsEnter.selectAll('label')
-                   .data(function(d) {
-                       return d.values.map(function(val) { return { value: val, key: d.key }; });
-                   })
-                   .enter()
-                   .append('label');
+         tool.render = function (selection) {
+           var tooltipBehavior = uiTooltip().placement('bottom').title(function (d) {
+             return d.annotation() ? _t.html(d.id + '.tooltip', {
+               action: d.annotation()
+             }) : _t.html(d.id + '.nothing');
+           }).keys(function (d) {
+             return [d.cmd];
+           }).scrollContainer(context.container().select('.top-toolbar'));
+           var lastPointerUpType;
+           var buttons = selection.selectAll('button').data(commands).enter().append('button').attr('class', function (d) {
+             return 'disabled ' + d.id + '-button bar-button';
+           }).on('pointerup', function (d3_event) {
+             // `pointerup` is always called before `click`
+             lastPointerUpType = d3_event.pointerType;
+           }).on('click', function (d3_event, d) {
+             d3_event.preventDefault();
+             var annotation = d.annotation();
+
+             if (editable() && annotation) {
+               d.action();
+             }
+
+             if (editable() && (lastPointerUpType === 'touch' || lastPointerUpType === 'pen')) {
+               // there are no tooltips for touch interactions so flash feedback instead
+               var text = annotation ? _t(d.id + '.tooltip', {
+                 action: annotation
+               }) : _t(d.id + '.nothing');
+               context.ui().flash.duration(2000).iconName('#' + d.icon).iconClass(annotation ? '' : 'disabled').label(text)();
+             }
+
+             lastPointerUpType = null;
+           }).call(tooltipBehavior);
+           buttons.each(function (d) {
+             select(this).call(svgIcon('#' + d.icon));
+           });
+           context.keybinding().on(commands[0].cmd, function (d3_event) {
+             d3_event.preventDefault();
+             if (editable()) commands[0].action();
+           }).on(commands[1].cmd, function (d3_event) {
+             d3_event.preventDefault();
+             if (editable()) commands[1].action();
+           });
 
-               valuesEnter
-                   .append('input')
-                   .attr('type', 'radio')
-                   .attr('name', function(d) { return 'issues-option-' + d.key; })
-                   .attr('value', function(d) { return d.value; })
-                   .property('checked', function(d) { return getOptions()[d.key] === d.value; })
-                   .on('change', function(d) { updateOptionValue(d.key, d.value); });
+           var debouncedUpdate = debounce(update, 500, {
+             leading: true,
+             trailing: true
+           });
 
-               valuesEnter
-                   .append('span')
-                   .text(function(d) { return _t('issues.options.' + d.key + '.' + d.value); });
-           }
+           context.map().on('move.undo_redo', debouncedUpdate).on('drawn.undo_redo', debouncedUpdate);
+           context.history().on('change.undo_redo', function (difference) {
+             if (difference) update();
+           });
+           context.on('enter.undo_redo', update);
 
-           function getOptions() {
-               return {
-                   what: corePreferences('validate-what') || 'edited',  // 'all', 'edited'
-                   where: corePreferences('validate-where') || 'all'    // 'all', 'visible'
-               };
-           }
+           function update() {
+             buttons.classed('disabled', function (d) {
+               return !editable() || !d.annotation();
+             }).each(function () {
+               var selection = select(this);
 
-           function updateOptionValue(d, val) {
-               if (!val && event && event.target) {
-                   val = event.target.value;
+               if (!selection.select('.tooltip.in').empty()) {
+                 selection.call(tooltipBehavior.updateContent);
                }
-
-               corePreferences('validate-' + d, val);
-               context.validator().validate();
+             });
            }
+         };
 
-           return section;
-       }
-
-       function uiSectionValidationRules(context) {
-
-           var MINSQUARE = 0;
-           var MAXSQUARE = 20;
-           var DEFAULTSQUARE = 5;  // see also unsquare_way.js
-
-           var section = uiSection('issues-rules', context)
-               .disclosureContent(renderDisclosureContent)
-               .title(_t('issues.rules.title'));
+         tool.uninstall = function () {
+           context.keybinding().off(commands[0].cmd).off(commands[1].cmd);
+           context.map().on('move.undo_redo', null).on('drawn.undo_redo', null);
+           context.history().on('change.undo_redo', null);
+           context.on('enter.undo_redo', null);
+         };
 
-           var _ruleKeys = context.validator().getRuleKeys()
-               .filter(function(key) { return key !== 'maprules'; })
-               .sort(function(key1, key2) {
-                   // alphabetize by localized title
-                   return _t('issues.' + key1 + '.title') < _t('issues.' + key2 + '.title') ? -1 : 1;
-               });
+         return tool;
+       }
 
-           function renderDisclosureContent(selection) {
-               var container = selection.selectAll('.issues-rulelist-container')
-                   .data([0]);
+       function uiTopToolbar(context) {
+         var sidebarToggle = uiToolSidebarToggle(context),
+             modes = uiToolOldDrawModes(context),
+             notes = uiToolNotes(context),
+             undoRedo = uiToolUndoRedo(context),
+             save = uiToolSave(context);
 
-               var containerEnter = container.enter()
-                   .append('div')
-                   .attr('class', 'issues-rulelist-container');
+         function notesEnabled() {
+           var noteLayer = context.layers().layer('notes');
+           return noteLayer && noteLayer.enabled();
+         }
 
-               containerEnter
-                   .append('ul')
-                   .attr('class', 'layer-list issue-rules-list');
+         function topToolbar(bar) {
+           bar.on('wheel.topToolbar', function (d3_event) {
+             if (!d3_event.deltaX) {
+               // translate vertical scrolling into horizontal scrolling in case
+               // the user doesn't have an input device that can scroll horizontally
+               bar.node().scrollLeft += d3_event.deltaY;
+             }
+           });
 
-               var ruleLinks = containerEnter
-                   .append('div')
-                   .attr('class', 'issue-rules-links section-footer');
-
-               ruleLinks
-                   .append('a')
-                   .attr('class', 'issue-rules-link')
-                   .attr('href', '#')
-                   .text(_t('issues.enable_all'))
-                   .on('click', function() {
-                       context.validator().disableRules([]);
-                   });
+           var debouncedUpdate = debounce(update, 500, {
+             leading: true,
+             trailing: true
+           });
 
-               ruleLinks
-                   .append('a')
-                   .attr('class', 'issue-rules-link')
-                   .attr('href', '#')
-                   .text(_t('issues.disable_all'))
-                   .on('click', function() {
-                       context.validator().disableRules(_ruleKeys);
-                   });
+           context.layers().on('change.topToolbar', debouncedUpdate);
+           update();
 
+           function update() {
+             var tools = [sidebarToggle, 'spacer', modes];
+             tools.push('spacer');
 
-               // Update
-               container = container
-                   .merge(containerEnter);
+             if (notesEnabled()) {
+               tools = tools.concat([notes, 'spacer']);
+             }
 
-               container.selectAll('.issue-rules-list')
-                   .call(drawListItems, _ruleKeys, 'checkbox', 'rule', toggleRule, isRuleEnabled);
+             tools = tools.concat([undoRedo, save]);
+             var toolbarItems = bar.selectAll('.toolbar-item').data(tools, function (d) {
+               return d.id || d;
+             });
+             toolbarItems.exit().each(function (d) {
+               if (d.uninstall) {
+                 d.uninstall();
+               }
+             }).remove();
+             var itemsEnter = toolbarItems.enter().append('div').attr('class', function (d) {
+               var classes = 'toolbar-item ' + (d.id || d).replace('_', '-');
+               if (d.klass) classes += ' ' + d.klass;
+               return classes;
+             });
+             var actionableItems = itemsEnter.filter(function (d) {
+               return d !== 'spacer';
+             });
+             actionableItems.append('div').attr('class', 'item-content').each(function (d) {
+               select(this).call(d.render, bar);
+             });
+             actionableItems.append('div').attr('class', 'item-label').html(function (d) {
+               return d.label;
+             });
            }
+         }
 
-           function drawListItems(selection, data, type, name, change, active) {
-               var items = selection.selectAll('li')
-                   .data(data);
+         return topToolbar;
+       }
 
-               // Exit
-               items.exit()
-                   .remove();
+       var sawVersion = null;
+       var isNewVersion = false;
+       var isNewUser = false;
+       function uiVersion(context) {
+         var currVersion = context.version;
+         var matchedVersion = currVersion.match(/\d+\.\d+\.\d+.*/);
 
-               // Enter
-               var enter = items.enter()
-                   .append('li');
+         if (sawVersion === null && matchedVersion !== null) {
+           if (corePreferences('sawVersion')) {
+             isNewUser = false;
+             isNewVersion = corePreferences('sawVersion') !== currVersion && currVersion.indexOf('-') === -1;
+           } else {
+             isNewUser = true;
+             isNewVersion = true;
+           }
 
-               if (name === 'rule') {
-                   enter
-                       .call(uiTooltip()
-                           .title(function(d) { return _t('issues.' + d + '.tip'); })
-                           .placement('top')
-                       );
-               }
+           corePreferences('sawVersion', currVersion);
+           sawVersion = currVersion;
+         }
 
-               var label = enter
-                   .append('label');
+         return function (selection) {
+           selection.append('a').attr('target', '_blank').attr('href', 'https://github.com/openstreetmap/iD').html(currVersion); // only show new version indicator to users that have used iD before
 
-               label
-                   .append('input')
-                   .attr('type', type)
-                   .attr('name', name)
-                   .on('change', change);
+           if (isNewVersion && !isNewUser) {
+             selection.append('a').attr('class', 'badge').attr('target', '_blank').attr('href', 'https://github.com/openstreetmap/iD/blob/release/CHANGELOG.md#whats-new').call(svgIcon('#maki-gift-11')).call(uiTooltip().title(_t.html('version.whats_new', {
+               version: currVersion
+             })).placement('top').scrollContainer(context.container().select('.main-footer-wrap')));
+           }
+         };
+       }
 
-               label
-                   .append('span')
-                   .html(function(d) {
-                       var params = {};
-                       if (d === 'unsquare_way') {
-                           params.val = '<span class="square-degrees"></span>';
-                       }
-                       return _t('issues.' + d + '.title', params);
-                   });
+       function uiZoom(context) {
+         var zooms = [{
+           id: 'zoom-in',
+           icon: 'iD-icon-plus',
+           title: _t.html('zoom.in'),
+           action: zoomIn,
+           disabled: function disabled() {
+             return !context.map().canZoomIn();
+           },
+           disabledTitle: _t.html('zoom.disabled.in'),
+           key: '+'
+         }, {
+           id: 'zoom-out',
+           icon: 'iD-icon-minus',
+           title: _t.html('zoom.out'),
+           action: zoomOut,
+           disabled: function disabled() {
+             return !context.map().canZoomOut();
+           },
+           disabledTitle: _t.html('zoom.disabled.out'),
+           key: '-'
+         }];
 
-               // Update
-               items = items
-                   .merge(enter);
-
-               items
-                   .classed('active', active)
-                   .selectAll('input')
-                   .property('checked', active)
-                   .property('indeterminate', false);
-
-
-               // user-configurable square threshold
-               var degStr = corePreferences('validate-square-degrees');
-               if (degStr === null) {
-                   degStr = '' + DEFAULTSQUARE;
-               }
-
-               var span = items.selectAll('.square-degrees');
-               var input = span.selectAll('.square-degrees-input')
-                   .data([0]);
-
-               // enter / update
-               input.enter()
-                   .append('input')
-                   .attr('type', 'number')
-                   .attr('min', '' + MINSQUARE)
-                   .attr('max', '' + MAXSQUARE)
-                   .attr('step', '0.5')
-                   .attr('class', 'square-degrees-input')
-                   .call(utilNoAuto)
-                   .on('click', function () {
-                       event.preventDefault();
-                       event.stopPropagation();
-                       this.select();
-                   })
-                   .on('keyup', function () {
-                       if (event.keyCode === 13) { // enter
-                           this.blur();
-                           this.select();
-                       }
-                   })
-                   .on('blur', changeSquare)
-                   .merge(input)
-                   .property('value', degStr);
-           }
+         function zoomIn(d3_event) {
+           if (d3_event.shiftKey) return;
+           d3_event.preventDefault();
+           context.map().zoomIn();
+         }
 
-           function changeSquare() {
-               var input = select(this);
-               var degStr = utilGetSetValue(input).trim();
-               var degNum = parseFloat(degStr, 10);
+         function zoomOut(d3_event) {
+           if (d3_event.shiftKey) return;
+           d3_event.preventDefault();
+           context.map().zoomOut();
+         }
 
-               if (!isFinite(degNum)) {
-                   degNum = DEFAULTSQUARE;
-               } else if (degNum > MAXSQUARE) {
-                   degNum = MAXSQUARE;
-               } else if (degNum < MINSQUARE) {
-                   degNum = MINSQUARE;
-               }
+         function zoomInFurther(d3_event) {
+           if (d3_event.shiftKey) return;
+           d3_event.preventDefault();
+           context.map().zoomInFurther();
+         }
 
-               degNum = Math.round(degNum * 10 ) / 10;   // round to 1 decimal
-               degStr = '' + degNum;
+         function zoomOutFurther(d3_event) {
+           if (d3_event.shiftKey) return;
+           d3_event.preventDefault();
+           context.map().zoomOutFurther();
+         }
 
-               input
-                   .property('value', degStr);
+         return function (selection) {
+           var tooltipBehavior = uiTooltip().placement(_mainLocalizer.textDirection() === 'rtl' ? 'right' : 'left').title(function (d) {
+             if (d.disabled()) {
+               return d.disabledTitle;
+             }
 
-               corePreferences('validate-square-degrees', degStr);
-               context.validator().reloadUnsquareIssues();
-           }
+             return d.title;
+           }).keys(function (d) {
+             return [d.key];
+           });
+           var lastPointerUpType;
+           var buttons = selection.selectAll('button').data(zooms).enter().append('button').attr('class', function (d) {
+             return d.id;
+           }).on('pointerup.editor', function (d3_event) {
+             lastPointerUpType = d3_event.pointerType;
+           }).on('click.editor', function (d3_event, d) {
+             if (!d.disabled()) {
+               d.action(d3_event);
+             } else if (lastPointerUpType === 'touch' || lastPointerUpType === 'pen') {
+               context.ui().flash.duration(2000).iconName('#' + d.icon).iconClass('disabled').label(d.disabledTitle)();
+             }
+
+             lastPointerUpType = null;
+           }).call(tooltipBehavior);
+           buttons.each(function (d) {
+             select(this).call(svgIcon('#' + d.icon, 'light'));
+           });
+           utilKeybinding.plusKeys.forEach(function (key) {
+             context.keybinding().on([key], zoomIn);
+             context.keybinding().on([uiCmd('⌥' + key)], zoomInFurther);
+           });
+           utilKeybinding.minusKeys.forEach(function (key) {
+             context.keybinding().on([key], zoomOut);
+             context.keybinding().on([uiCmd('⌥' + key)], zoomOutFurther);
+           });
 
-           function isRuleEnabled(d) {
-               return context.validator().isRuleEnabled(d);
-           }
+           function updateButtonStates() {
+             buttons.classed('disabled', function (d) {
+               return d.disabled();
+             }).each(function () {
+               var selection = select(this);
 
-           function toggleRule(d) {
-               context.validator().toggleRule(d);
+               if (!selection.select('.tooltip.in').empty()) {
+                 selection.call(tooltipBehavior.updateContent);
+               }
+             });
            }
 
-           context.validator().on('validated.uiSectionValidationRules', function() {
-               window.requestIdleCallback(section.reRender);
-           });
-
-           return section;
+           updateButtonStates();
+           context.map().on('move.uiZoom', updateButtonStates);
+         };
        }
 
-       function uiSectionValidationStatus(context) {
-
-           var section = uiSection('issues-status', context)
-               .content(renderContent)
-               .shouldDisplay(function() {
-                   var issues = context.validator().getIssues(getOptions());
-                   return issues.length === 0;
-               });
+       function uiZoomToSelection(context) {
+         function isDisabled() {
+           var mode = context.mode();
+           return !mode || !mode.zoomToSelected;
+         }
 
-           function getOptions() {
-               return {
-                   what: corePreferences('validate-what') || 'edited',
-                   where: corePreferences('validate-where') || 'all'
-               };
-           }
+         var _lastPointerUpType;
 
-           function renderContent(selection) {
+         function pointerup(d3_event) {
+           _lastPointerUpType = d3_event.pointerType;
+         }
 
-               var box = selection.selectAll('.box')
-                   .data([0]);
+         function click(d3_event) {
+           d3_event.preventDefault();
 
-               var boxEnter = box.enter()
-                   .append('div')
-                   .attr('class', 'box');
+           if (isDisabled()) {
+             if (_lastPointerUpType === 'touch' || _lastPointerUpType === 'pen') {
+               context.ui().flash.duration(2000).iconName('#iD-icon-framed-dot').iconClass('disabled').label(_t.html('inspector.zoom_to.no_selection'))();
+             }
+           } else {
+             var mode = context.mode();
 
-               boxEnter
-                   .append('div')
-                   .call(svgIcon('#iD-icon-apply', 'pre-text'));
+             if (mode && mode.zoomToSelected) {
+               mode.zoomToSelected();
+             }
+           }
 
-               var noIssuesMessage = boxEnter
-                   .append('span');
+           _lastPointerUpType = null;
+         }
 
-               noIssuesMessage
-                   .append('strong')
-                   .attr('class', 'message');
+         return function (selection) {
+           var tooltipBehavior = uiTooltip().placement(_mainLocalizer.textDirection() === 'rtl' ? 'right' : 'left').title(function () {
+             if (isDisabled()) {
+               return _t.html('inspector.zoom_to.no_selection');
+             }
 
-               noIssuesMessage
-                   .append('br');
+             return _t.html('inspector.zoom_to.title');
+           }).keys([_t('inspector.zoom_to.key')]);
+           var button = selection.append('button').on('pointerup', pointerup).on('click', click).call(svgIcon('#iD-icon-framed-dot', 'light')).call(tooltipBehavior);
 
-               noIssuesMessage
-                   .append('span')
-                   .attr('class', 'details');
+           function setEnabledState() {
+             button.classed('disabled', isDisabled());
 
-               renderIgnoredIssuesReset(selection);
-               setNoIssuesText(selection);
+             if (!button.select('.tooltip.in').empty()) {
+               button.call(tooltipBehavior.updateContent);
+             }
            }
 
-           function renderIgnoredIssuesReset(selection) {
-
-               var ignoredIssues = context.validator()
-                   .getIssues({ what: 'all', where: 'all', includeDisabledRules: true, includeIgnored: 'only' });
+           context.on('enter.uiZoomToSelection', setEnabledState);
+           setEnabledState();
+         };
+       }
 
-               var resetIgnored = selection.selectAll('.reset-ignored')
-                   .data(ignoredIssues.length ? [0] : []);
+       function uiPane(id, context) {
+         var _key;
 
-               // exit
-               resetIgnored.exit()
-                   .remove();
+         var _label = '';
+         var _description = '';
+         var _iconName = '';
 
-               // enter
-               var resetIgnoredEnter = resetIgnored.enter()
-                   .append('div')
-                   .attr('class', 'reset-ignored section-footer');
+         var _sections; // array of uiSection objects
 
-               resetIgnoredEnter
-                   .append('a')
-                   .attr('href', '#');
 
-               // update
-               resetIgnored = resetIgnored
-                   .merge(resetIgnoredEnter);
+         var _paneSelection = select(null);
 
-               resetIgnored.select('a')
-                   .text(_t('issues.reset_ignored', { count: ignoredIssues.length.toString() }));
+         var _paneTooltip;
 
-               resetIgnored.on('click', function() {
-                   context.validator().resetIgnoredIssues();
-               });
-           }
+         var pane = {
+           id: id
+         };
 
-           function setNoIssuesText(selection) {
+         pane.label = function (val) {
+           if (!arguments.length) return _label;
+           _label = val;
+           return pane;
+         };
 
-               var opts = getOptions();
+         pane.key = function (val) {
+           if (!arguments.length) return _key;
+           _key = val;
+           return pane;
+         };
 
-               function checkForHiddenIssues(cases) {
-                   for (var type in cases) {
-                       var hiddenOpts = cases[type];
-                       var hiddenIssues = context.validator().getIssues(hiddenOpts);
-                       if (hiddenIssues.length) {
-                           selection.select('.box .details')
-                               .text(_t(
-                                   'issues.no_issues.hidden_issues.' + type,
-                                   { count: hiddenIssues.length.toString() }
-                               ));
-                           return;
-                       }
-                   }
-                   selection.select('.box .details')
-                       .text(_t('issues.no_issues.hidden_issues.none'));
-               }
+         pane.description = function (val) {
+           if (!arguments.length) return _description;
+           _description = val;
+           return pane;
+         };
 
-               var messageType;
+         pane.iconName = function (val) {
+           if (!arguments.length) return _iconName;
+           _iconName = val;
+           return pane;
+         };
 
-               if (opts.what === 'edited' && opts.where === 'visible') {
+         pane.sections = function (val) {
+           if (!arguments.length) return _sections;
+           _sections = val;
+           return pane;
+         };
 
-                   messageType = 'edits_in_view';
+         pane.selection = function () {
+           return _paneSelection;
+         };
 
-                   checkForHiddenIssues({
-                       elsewhere: { what: 'edited', where: 'all' },
-                       everything_else: { what: 'all', where: 'visible' },
-                       disabled_rules: { what: 'edited', where: 'visible', includeDisabledRules: 'only' },
-                       everything_else_elsewhere: { what: 'all', where: 'all' },
-                       disabled_rules_elsewhere: { what: 'edited', where: 'all', includeDisabledRules: 'only' },
-                       ignored_issues: { what: 'edited', where: 'visible', includeIgnored: 'only' },
-                       ignored_issues_elsewhere: { what: 'edited', where: 'all', includeIgnored: 'only' }
-                   });
+         function hidePane() {
+           context.ui().togglePanes();
+         }
 
-               } else if (opts.what === 'edited' && opts.where === 'all') {
+         pane.togglePane = function (d3_event) {
+           if (d3_event) d3_event.preventDefault();
 
-                   messageType = 'edits';
+           _paneTooltip.hide();
 
-                   checkForHiddenIssues({
-                       everything_else: { what: 'all', where: 'all' },
-                       disabled_rules: { what: 'edited', where: 'all', includeDisabledRules: 'only' },
-                       ignored_issues: { what: 'edited', where: 'all', includeIgnored: 'only' }
-                   });
+           context.ui().togglePanes(!_paneSelection.classed('shown') ? _paneSelection : undefined);
+         };
 
-               } else if (opts.what === 'all' && opts.where === 'visible') {
+         pane.renderToggleButton = function (selection) {
+           if (!_paneTooltip) {
+             _paneTooltip = uiTooltip().placement(_mainLocalizer.textDirection() === 'rtl' ? 'right' : 'left').title(_description).keys([_key]);
+           }
 
-                   messageType = 'everything_in_view';
+           selection.append('button').on('click', pane.togglePane).call(svgIcon('#' + _iconName, 'light')).call(_paneTooltip);
+         };
 
-                   checkForHiddenIssues({
-                       elsewhere: { what: 'all', where: 'all' },
-                       disabled_rules: { what: 'all', where: 'visible', includeDisabledRules: 'only' },
-                       disabled_rules_elsewhere: { what: 'all', where: 'all', includeDisabledRules: 'only' },
-                       ignored_issues: { what: 'all', where: 'visible', includeIgnored: 'only' },
-                       ignored_issues_elsewhere: { what: 'all', where: 'all', includeIgnored: 'only' }
-                   });
-               } else if (opts.what === 'all' && opts.where === 'all') {
+         pane.renderContent = function (selection) {
+           // override to fully customize content
+           if (_sections) {
+             _sections.forEach(function (section) {
+               selection.call(section.render);
+             });
+           }
+         };
 
-                   messageType = 'everything';
+         pane.renderPane = function (selection) {
+           _paneSelection = selection.append('div').attr('class', 'fillL map-pane hide ' + id + '-pane').attr('pane', id);
 
-                   checkForHiddenIssues({
-                       disabled_rules: { what: 'all', where: 'all', includeDisabledRules: 'only' },
-                       ignored_issues: { what: 'all', where: 'all', includeIgnored: 'only' }
-                   });
-               }
+           var heading = _paneSelection.append('div').attr('class', 'pane-heading');
 
-               if (opts.what === 'edited' && context.history().difference().summary().length === 0) {
-                   messageType = 'no_edits';
-               }
+           heading.append('h2').html(_label);
+           heading.append('button').on('click', hidePane).call(svgIcon('#iD-icon-close'));
 
-               selection.select('.box .message')
-                   .text(_t('issues.no_issues.message.' + messageType));
+           _paneSelection.append('div').attr('class', 'pane-content').call(pane.renderContent);
 
+           if (_key) {
+             context.keybinding().on(_key, pane.togglePane);
            }
+         };
 
-           context.validator().on('validated.uiSectionValidationStatus', function() {
-               window.requestIdleCallback(section.reRender);
-           });
+         return pane;
+       }
 
-           context.map().on('move.uiSectionValidationStatus',
-               debounce(function() {
-                   window.requestIdleCallback(section.reRender);
-               }, 1000)
-           );
+       function uiSectionBackgroundDisplayOptions(context) {
+         var section = uiSection('background-display-options', context).label(_t.html('background.display_options')).disclosureContent(renderDisclosureContent);
 
-           return section;
-       }
+         var _detected = utilDetect();
 
-       function uiPaneIssues(context) {
+         var _storedOpacity = corePreferences('background-opacity');
 
-           var issuesPane = uiPane('issues', context)
-               .key(_t('issues.key'))
-               .title(_t('issues.title'))
-               .description(_t('issues.title'))
-               .iconName('iD-icon-alert')
-               .sections([
-                   uiSectionValidationOptions(context),
-                   uiSectionValidationStatus(context),
-                   uiSectionValidationIssues('issues-errors', 'error', context),
-                   uiSectionValidationIssues('issues-warnings', 'warning', context),
-                   uiSectionValidationRules(context)
-               ]);
+         var _minVal = 0;
 
-           return issuesPane;
-       }
+         var _maxVal = _detected.cssfilters ? 3 : 1;
 
-       function uiSettingsCustomData(context) {
-           var dispatch$1 = dispatch('change');
+         var _sliders = _detected.cssfilters ? ['brightness', 'contrast', 'saturation', 'sharpness'] : ['brightness'];
 
-           function render(selection) {
-               var dataLayer = context.layers().layer('data');
+         var _options = {
+           brightness: _storedOpacity !== null ? +_storedOpacity : 1,
+           contrast: 1,
+           saturation: 1,
+           sharpness: 1
+         };
 
-               // keep separate copies of original and current settings
-               var _origSettings = {
-                   fileList: (dataLayer && dataLayer.fileList()) || null,
-                   url: corePreferences('settings-custom-data-url')
-               };
-               var _currSettings = {
-                   fileList: (dataLayer && dataLayer.fileList()) || null,
-                   url: corePreferences('settings-custom-data-url')
-               };
+         function clamp(x, min, max) {
+           return Math.max(min, Math.min(x, max));
+         }
 
-               // var example = 'https://{switch:a,b,c}.tile.openstreetmap.org/{zoom}/{x}/{y}.png';
-               var modal = uiConfirm(selection).okButton();
-
-               modal
-                   .classed('settings-modal settings-custom-data', true);
-
-               modal.select('.modal-section.header')
-                   .append('h3')
-                   .text(_t('settings.custom_data.header'));
-
-
-               var textSection = modal.select('.modal-section.message-text');
-
-               textSection
-                   .append('pre')
-                   .attr('class', 'instructions-file')
-                   .text(_t('settings.custom_data.file.instructions'));
-
-               textSection
-                   .append('input')
-                   .attr('class', 'field-file')
-                   .attr('type', 'file')
-                   .property('files', _currSettings.fileList)  // works for all except IE11
-                   .on('change', function() {
-                       var files = event.target.files;
-                       if (files && files.length) {
-                           _currSettings.url = '';
-                           textSection.select('.field-url').property('value', '');
-                           _currSettings.fileList = files;
-                       } else {
-                           _currSettings.fileList = null;
-                       }
-                   });
+         function updateValue(d, val) {
+           val = clamp(val, _minVal, _maxVal);
+           _options[d] = val;
+           context.background()[d](val);
 
-               textSection
-                   .append('h4')
-                   .text(_t('settings.custom_data.or'));
+           if (d === 'brightness') {
+             corePreferences('background-opacity', val);
+           }
 
-               textSection
-                   .append('pre')
-                   .attr('class', 'instructions-url')
-                   .text(_t('settings.custom_data.url.instructions'));
+           section.reRender();
+         }
 
-               textSection
-                   .append('textarea')
-                   .attr('class', 'field-url')
-                   .attr('placeholder', _t('settings.custom_data.url.placeholder'))
-                   .call(utilNoAuto)
-                   .property('value', _currSettings.url);
+         function renderDisclosureContent(selection) {
+           var container = selection.selectAll('.display-options-container').data([0]);
+           var containerEnter = container.enter().append('div').attr('class', 'display-options-container controls-list'); // add slider controls
 
+           var slidersEnter = containerEnter.selectAll('.display-control').data(_sliders).enter().append('div').attr('class', function (d) {
+             return 'display-control display-control-' + d;
+           });
+           slidersEnter.append('h5').html(function (d) {
+             return _t.html('background.' + d);
+           }).append('span').attr('class', function (d) {
+             return 'display-option-value display-option-value-' + d;
+           });
+           var sildersControlEnter = slidersEnter.append('div').attr('class', 'control-wrap');
+           sildersControlEnter.append('input').attr('class', function (d) {
+             return 'display-option-input display-option-input-' + d;
+           }).attr('type', 'range').attr('min', _minVal).attr('max', _maxVal).attr('step', '0.05').on('input', function (d3_event, d) {
+             var val = select(this).property('value');
 
-               // insert a cancel button
-               var buttonSection = modal.select('.modal-section.buttons');
+             if (!val && d3_event && d3_event.target) {
+               val = d3_event.target.value;
+             }
 
-               buttonSection
-                   .insert('button', '.ok-button')
-                   .attr('class', 'button cancel-button secondary-action')
-                   .text(_t('confirm.cancel'));
+             updateValue(d, val);
+           });
+           sildersControlEnter.append('button').attr('title', _t('background.reset')).attr('class', function (d) {
+             return 'display-option-reset display-option-reset-' + d;
+           }).on('click', function (d3_event, d) {
+             if (d3_event.button !== 0) return;
+             updateValue(d, 1);
+           }).call(svgIcon('#iD-icon-' + (_mainLocalizer.textDirection() === 'rtl' ? 'redo' : 'undo'))); // reset all button
 
+           containerEnter.append('a').attr('class', 'display-option-resetlink').attr('href', '#').html(_t.html('background.reset_all')).on('click', function (d3_event) {
+             d3_event.preventDefault();
 
-               buttonSection.select('.cancel-button')
-                   .on('click.cancel', clickCancel);
+             for (var i = 0; i < _sliders.length; i++) {
+               updateValue(_sliders[i], 1);
+             }
+           }); // update
 
-               buttonSection.select('.ok-button')
-                   .attr('disabled', isSaveDisabled)
-                   .on('click.save', clickSave);
+           container = containerEnter.merge(container);
+           container.selectAll('.display-option-input').property('value', function (d) {
+             return _options[d];
+           });
+           container.selectAll('.display-option-value').html(function (d) {
+             return Math.floor(_options[d] * 100) + '%';
+           });
+           container.selectAll('.display-option-reset').classed('disabled', function (d) {
+             return _options[d] === 1;
+           }); // first time only, set brightness if needed
 
+           if (containerEnter.size() && _options.brightness !== 1) {
+             context.background().brightness(_options.brightness);
+           }
+         }
 
-               function isSaveDisabled() {
-                   return null;
-               }
+         return section;
+       }
 
+       function uiSettingsCustomBackground() {
+         var dispatch$1 = dispatch('change');
+
+         function render(selection) {
+           // keep separate copies of original and current settings
+           var _origSettings = {
+             template: corePreferences('background-custom-template')
+           };
+           var _currSettings = {
+             template: corePreferences('background-custom-template')
+           };
+           var example = 'https://{switch:a,b,c}.tile.openstreetmap.org/{zoom}/{x}/{y}.png';
+           var modal = uiConfirm(selection).okButton();
+           modal.classed('settings-modal settings-custom-background', true);
+           modal.select('.modal-section.header').append('h3').html(_t.html('settings.custom_background.header'));
+           var textSection = modal.select('.modal-section.message-text');
+           var instructions = "".concat(_t.html('settings.custom_background.instructions.info'), "\n") + '\n' + "#### ".concat(_t.html('settings.custom_background.instructions.wms.tokens_label'), "\n") + "* ".concat(_t.html('settings.custom_background.instructions.wms.tokens.proj'), "\n") + "* ".concat(_t.html('settings.custom_background.instructions.wms.tokens.wkid'), "\n") + "* ".concat(_t.html('settings.custom_background.instructions.wms.tokens.dimensions'), "\n") + "* ".concat(_t.html('settings.custom_background.instructions.wms.tokens.bbox'), "\n") + '\n' + "#### ".concat(_t.html('settings.custom_background.instructions.tms.tokens_label'), "\n") + "* ".concat(_t.html('settings.custom_background.instructions.tms.tokens.xyz'), "\n") + "* ".concat(_t.html('settings.custom_background.instructions.tms.tokens.flipped_y'), "\n") + "* ".concat(_t.html('settings.custom_background.instructions.tms.tokens.switch'), "\n") + "* ".concat(_t.html('settings.custom_background.instructions.tms.tokens.quadtile'), "\n") + "* ".concat(_t.html('settings.custom_background.instructions.tms.tokens.scale_factor'), "\n") + '\n' + "#### ".concat(_t.html('settings.custom_background.instructions.example'), "\n") + "`".concat(example, "`");
+           textSection.append('div').attr('class', 'instructions-template').html(marked_1(instructions));
+           textSection.append('textarea').attr('class', 'field-template').attr('placeholder', _t('settings.custom_background.template.placeholder')).call(utilNoAuto).property('value', _currSettings.template); // insert a cancel button
+
+           var buttonSection = modal.select('.modal-section.buttons');
+           buttonSection.insert('button', '.ok-button').attr('class', 'button cancel-button secondary-action').html(_t.html('confirm.cancel'));
+           buttonSection.select('.cancel-button').on('click.cancel', clickCancel);
+           buttonSection.select('.ok-button').attr('disabled', isSaveDisabled).on('click.save', clickSave);
+
+           function isSaveDisabled() {
+             return null;
+           } // restore the original template
 
-               // restore the original url
-               function clickCancel() {
-                   textSection.select('.field-url').property('value', _origSettings.url);
-                   corePreferences('settings-custom-data-url', _origSettings.url);
-                   this.blur();
-                   modal.close();
-               }
 
-               // accept the current url
-               function clickSave() {
-                   _currSettings.url = textSection.select('.field-url').property('value').trim();
+           function clickCancel() {
+             textSection.select('.field-template').property('value', _origSettings.template);
+             corePreferences('background-custom-template', _origSettings.template);
+             this.blur();
+             modal.close();
+           } // accept the current template
 
-                   // one or the other but not both
-                   if (_currSettings.url) { _currSettings.fileList = null; }
-                   if (_currSettings.fileList) { _currSettings.url = ''; }
 
-                   corePreferences('settings-custom-data-url', _currSettings.url);
-                   this.blur();
-                   modal.close();
-                   dispatch$1.call('change', this, _currSettings);
-               }
+           function clickSave() {
+             _currSettings.template = textSection.select('.field-template').property('value');
+             corePreferences('background-custom-template', _currSettings.template);
+             this.blur();
+             modal.close();
+             dispatch$1.call('change', this, _currSettings);
            }
+         }
 
-           return utilRebind(render, dispatch$1, 'on');
+         return utilRebind(render, dispatch$1, 'on');
        }
 
-       function uiSectionDataLayers(context) {
+       function uiSectionBackgroundList(context) {
+         var _backgroundList = select(null);
 
-           var settingsCustomData = uiSettingsCustomData(context)
-               .on('change', customChanged);
+         var _customSource = context.background().findSource('custom');
 
-           var layers = context.layers();
+         var _settingsCustomBackground = uiSettingsCustomBackground().on('change', customChanged);
 
-           var section = uiSection('data-layers', context)
-               .title(_t('map_data.data_layers'))
-               .disclosureContent(renderDisclosureContent);
+         var section = uiSection('background-list', context).label(_t.html('background.backgrounds')).disclosureContent(renderDisclosureContent);
 
-           function renderDisclosureContent(selection) {
-               var container = selection.selectAll('.data-layer-container')
-                   .data([0]);
+         function previousBackgroundID() {
+           return corePreferences('background-last-used-toggle');
+         }
 
-               container.enter()
-                   .append('div')
-                   .attr('class', 'data-layer-container')
-                   .merge(container)
-                   .call(drawOsmItems)
-                   .call(drawQAItems)
-                   .call(drawCustomDataItems)
-                   .call(drawVectorItems)      // Beta - Detroit mapping challenge
-                   .call(drawPanelItems);
-           }
+         function renderDisclosureContent(selection) {
+           // the background list
+           var container = selection.selectAll('.layer-background-list').data([0]);
+           _backgroundList = container.enter().append('ul').attr('class', 'layer-list layer-background-list').attr('dir', 'auto').merge(container); // add minimap toggle below list
 
-           function showsLayer(which) {
-               var layer = layers.layer(which);
-               if (layer) {
-                   return layer.enabled();
-               }
-               return false;
-           }
+           var bgExtrasListEnter = selection.selectAll('.bg-extras-list').data([0]).enter().append('ul').attr('class', 'layer-list bg-extras-list');
+           var minimapLabelEnter = bgExtrasListEnter.append('li').attr('class', 'minimap-toggle-item').append('label').call(uiTooltip().title(_t.html('background.minimap.tooltip')).keys([_t('background.minimap.key')]).placement('top'));
+           minimapLabelEnter.append('input').attr('type', 'checkbox').on('change', function (d3_event) {
+             d3_event.preventDefault();
+             uiMapInMap.toggle();
+           });
+           minimapLabelEnter.append('span').html(_t.html('background.minimap.description'));
+           var panelLabelEnter = bgExtrasListEnter.append('li').attr('class', 'background-panel-toggle-item').append('label').call(uiTooltip().title(_t.html('background.panel.tooltip')).keys([uiCmd('⌘⇧' + _t('info_panels.background.key'))]).placement('top'));
+           panelLabelEnter.append('input').attr('type', 'checkbox').on('change', function (d3_event) {
+             d3_event.preventDefault();
+             context.ui().info.toggle('background');
+           });
+           panelLabelEnter.append('span').html(_t.html('background.panel.description'));
+           var locPanelLabelEnter = bgExtrasListEnter.append('li').attr('class', 'location-panel-toggle-item').append('label').call(uiTooltip().title(_t.html('background.location_panel.tooltip')).keys([uiCmd('⌘⇧' + _t('info_panels.location.key'))]).placement('top'));
+           locPanelLabelEnter.append('input').attr('type', 'checkbox').on('change', function (d3_event) {
+             d3_event.preventDefault();
+             context.ui().info.toggle('location');
+           });
+           locPanelLabelEnter.append('span').html(_t.html('background.location_panel.description')); // "Info / Report a Problem" link
 
-           function setLayer(which, enabled) {
-               // Don't allow layer changes while drawing - #6584
-               var mode = context.mode();
-               if (mode && /^draw/.test(mode.id)) return;
+           selection.selectAll('.imagery-faq').data([0]).enter().append('div').attr('class', 'imagery-faq').append('a').attr('target', '_blank').call(svgIcon('#iD-icon-out-link', 'inline')).attr('href', 'https://github.com/openstreetmap/iD/blob/develop/FAQ.md#how-can-i-report-an-issue-with-background-imagery').append('span').html(_t.html('background.imagery_problem_faq'));
 
-               var layer = layers.layer(which);
-               if (layer) {
-                   layer.enabled(enabled);
+           _backgroundList.call(drawListItems, 'radio', function (d3_event, d) {
+             chooseBackground(d);
+           }, function (d) {
+             return !d.isHidden() && !d.overlay;
+           });
+         }
 
-                   if (!enabled && (which === 'osm' || which === 'notes')) {
-                       context.enter(modeBrowse(context));
-                   }
-               }
-           }
+         function setTooltips(selection) {
+           selection.each(function (d, i, nodes) {
+             var item = select(this).select('label');
+             var span = item.select('span');
+             var placement = i < nodes.length / 2 ? 'bottom' : 'top';
+             var description = d.description();
+             var isOverflowing = span.property('clientWidth') !== span.property('scrollWidth');
+             item.call(uiTooltip().destroyAny);
 
-           function toggleLayer(which) {
-               setLayer(which, !showsLayer(which));
-           }
+             if (d.id === previousBackgroundID()) {
+               item.call(uiTooltip().placement(placement).title('<div>' + _t.html('background.switch') + '</div>').keys([uiCmd('⌘' + _t('background.key'))]));
+             } else if (description || isOverflowing) {
+               item.call(uiTooltip().placement(placement).title(description || d.label()));
+             }
+           });
+         }
 
-           function drawOsmItems(selection) {
-               var osmKeys = ['osm', 'notes'];
-               var osmLayers = layers.all().filter(function(obj) { return osmKeys.indexOf(obj.id) !== -1; });
+         function drawListItems(layerList, type, change, filter) {
+           var sources = context.background().sources(context.map().extent(), context.map().zoom(), true).filter(filter).sort(function (a, b) {
+             return a.best() && !b.best() ? -1 : b.best() && !a.best() ? 1 : d3_descending(a.area(), b.area()) || d3_ascending(a.name(), b.name()) || 0;
+           });
+           var layerLinks = layerList.selectAll('li') // We have to be a bit inefficient about reordering the list since
+           // arrow key navigation of radio values likes to work in the order
+           // they were added, not the display document order.
+           .data(sources, function (d, i) {
+             return d.id + '---' + i;
+           });
+           layerLinks.exit().remove();
+           var enter = layerLinks.enter().append('li').classed('layer-custom', function (d) {
+             return d.id === 'custom';
+           }).classed('best', function (d) {
+             return d.best();
+           });
+           var label = enter.append('label');
+           label.append('input').attr('type', type).attr('name', 'background-layer').attr('value', function (d) {
+             return d.id;
+           }).on('change', change);
+           label.append('span').html(function (d) {
+             return d.label();
+           });
+           enter.filter(function (d) {
+             return d.id === 'custom';
+           }).append('button').attr('class', 'layer-browse').call(uiTooltip().title(_t.html('settings.custom_background.tooltip')).placement(_mainLocalizer.textDirection() === 'rtl' ? 'right' : 'left')).on('click', editCustom).call(svgIcon('#iD-icon-more'));
+           enter.filter(function (d) {
+             return d.best();
+           }).append('div').attr('class', 'best').call(uiTooltip().title(_t.html('background.best_imagery')).placement(_mainLocalizer.textDirection() === 'rtl' ? 'right' : 'left')).append('span').html('&#9733;');
+           layerList.call(updateLayerSelections);
+         }
+
+         function updateLayerSelections(selection) {
+           function active(d) {
+             return context.background().showsLayer(d);
+           }
 
-               var ul = selection
-                   .selectAll('.layer-list-osm')
-                   .data([0]);
+           selection.selectAll('li').classed('active', active).classed('switch', function (d) {
+             return d.id === previousBackgroundID();
+           }).call(setTooltips).selectAll('input').property('checked', active);
+         }
 
-               ul = ul.enter()
-                   .append('ul')
-                   .attr('class', 'layer-list layer-list-osm')
-                   .merge(ul);
+         function chooseBackground(d) {
+           if (d.id === 'custom' && !d.template()) {
+             return editCustom();
+           }
 
-               var li = ul.selectAll('.list-item')
-                   .data(osmLayers);
+           var previousBackground = context.background().baseLayerSource();
+           corePreferences('background-last-used-toggle', previousBackground.id);
+           corePreferences('background-last-used', d.id);
+           context.background().baseLayerSource(d);
+         }
 
-               li.exit()
-                   .remove();
+         function customChanged(d) {
+           if (d && d.template) {
+             _customSource.template(d.template);
 
-               var liEnter = li.enter()
-                   .append('li')
-                   .attr('class', function(d) { return 'list-item list-item-' + d.id; });
+             chooseBackground(_customSource);
+           } else {
+             _customSource.template('');
 
-               var labelEnter = liEnter
-                   .append('label')
-                   .each(function(d) {
-                       if (d.id === 'osm') {
-                           select(this)
-                               .call(uiTooltip()
-                                   .title(_t('map_data.layers.' + d.id + '.tooltip'))
-                                   .keys([uiCmd('⌥' + _t('area_fill.wireframe.key'))])
-                                   .placement('bottom')
-                               );
-                       } else {
-                           select(this)
-                               .call(uiTooltip()
-                                   .title(_t('map_data.layers.' + d.id + '.tooltip'))
-                                   .placement('bottom')
-                               );
-                       }
-                   });
+             chooseBackground(context.background().findSource('none'));
+           }
+         }
 
-               labelEnter
-                   .append('input')
-                   .attr('type', 'checkbox')
-                   .on('change', function(d) { toggleLayer(d.id); });
+         function editCustom(d3_event) {
+           d3_event.preventDefault();
+           context.container().call(_settingsCustomBackground);
+         }
 
-               labelEnter
-                   .append('span')
-                   .text(function(d) { return _t('map_data.layers.' + d.id + '.title'); });
+         context.background().on('change.background_list', function () {
+           _backgroundList.call(updateLayerSelections);
+         });
+         context.map().on('move.background_list', debounce(function () {
+           // layers in-view may have changed due to map move
+           window.requestIdleCallback(section.reRender);
+         }, 1000));
+         return section;
+       }
 
+       function uiSectionBackgroundOffset(context) {
+         var section = uiSection('background-offset', context).label(_t.html('background.fix_misalignment')).disclosureContent(renderDisclosureContent).expandedByDefault(false);
 
-               // Update
-               li
-                   .merge(liEnter)
-                   .classed('active', function (d) { return d.layer.enabled(); })
-                   .selectAll('input')
-                   .property('checked', function (d) { return d.layer.enabled(); });
-           }
+         var _pointerPrefix = 'PointerEvent' in window ? 'pointer' : 'mouse';
 
-           function drawQAItems(selection) {
-               var qaKeys = ['keepRight', 'improveOSM', 'osmose'];
-               var qaLayers = layers.all().filter(function(obj) { return qaKeys.indexOf(obj.id) !== -1; });
+         var _directions = [['top', [0, -0.5]], ['left', [-0.5, 0]], ['right', [0.5, 0]], ['bottom', [0, 0.5]]];
 
-               var ul = selection
-                   .selectAll('.layer-list-qa')
-                   .data([0]);
+         function updateValue() {
+           var meters = geoOffsetToMeters(context.background().offset());
+           var x = +meters[0].toFixed(2);
+           var y = +meters[1].toFixed(2);
+           context.container().selectAll('.nudge-inner-rect').select('input').classed('error', false).property('value', x + ', ' + y);
+           context.container().selectAll('.nudge-reset').classed('disabled', function () {
+             return x === 0 && y === 0;
+           });
+         }
 
-               ul = ul.enter()
-                   .append('ul')
-                   .attr('class', 'layer-list layer-list-qa')
-                   .merge(ul);
+         function resetOffset() {
+           context.background().offset([0, 0]);
+           updateValue();
+         }
 
-               var li = ul.selectAll('.list-item')
-                   .data(qaLayers);
+         function nudge(d) {
+           context.background().nudge(d, context.map().zoom());
+           updateValue();
+         }
 
-               li.exit()
-                   .remove();
+         function inputOffset() {
+           var input = select(this);
+           var d = input.node().value;
+           if (d === '') return resetOffset();
+           d = d.replace(/;/g, ',').split(',').map(function (n) {
+             // if n is NaN, it will always get mapped to false.
+             return !isNaN(n) && n;
+           });
 
-               var liEnter = li.enter()
-                   .append('li')
-                   .attr('class', function(d) { return 'list-item list-item-' + d.id; });
+           if (d.length !== 2 || !d[0] || !d[1]) {
+             input.classed('error', true);
+             return;
+           }
 
-               var labelEnter = liEnter
-                   .append('label')
-                   .each(function(d) {
-                       select(this)
-                           .call(uiTooltip()
-                               .title(_t('map_data.layers.' + d.id + '.tooltip'))
-                               .placement('bottom')
-                           );
-                   });
+           context.background().offset(geoMetersToOffset(d));
+           updateValue();
+         }
 
-               labelEnter
-                   .append('input')
-                   .attr('type', 'checkbox')
-                   .on('change', function(d) { toggleLayer(d.id); });
+         function dragOffset(d3_event) {
+           if (d3_event.button !== 0) return;
+           var origin = [d3_event.clientX, d3_event.clientY];
+           var pointerId = d3_event.pointerId || 'mouse';
+           context.container().append('div').attr('class', 'nudge-surface');
+           select(window).on(_pointerPrefix + 'move.drag-bg-offset', pointermove).on(_pointerPrefix + 'up.drag-bg-offset', pointerup);
 
-               labelEnter
-                   .append('span')
-                   .text(function(d) { return _t('map_data.layers.' + d.id + '.title'); });
+           if (_pointerPrefix === 'pointer') {
+             select(window).on('pointercancel.drag-bg-offset', pointerup);
+           }
 
+           function pointermove(d3_event) {
+             if (pointerId !== (d3_event.pointerId || 'mouse')) return;
+             var latest = [d3_event.clientX, d3_event.clientY];
+             var d = [-(origin[0] - latest[0]) / 4, -(origin[1] - latest[1]) / 4];
+             origin = latest;
+             nudge(d);
+           }
 
-               // Update
-               li
-                   .merge(liEnter)
-                   .classed('active', function (d) { return d.layer.enabled(); })
-                   .selectAll('input')
-                   .property('checked', function (d) { return d.layer.enabled(); });
+           function pointerup(d3_event) {
+             if (pointerId !== (d3_event.pointerId || 'mouse')) return;
+             if (d3_event.button !== 0) return;
+             context.container().selectAll('.nudge-surface').remove();
+             select(window).on('.drag-bg-offset', null);
            }
+         }
 
-           // Beta feature - sample vector layers to support Detroit Mapping Challenge
-           // https://github.com/osmus/detroit-mapping-challenge
-           function drawVectorItems(selection) {
-               var dataLayer = layers.layer('data');
-               var vtData = [
-                   {
-                       name: 'Detroit Neighborhoods/Parks',
-                       src: 'neighborhoods-parks',
-                       tooltip: 'Neighborhood boundaries and parks as compiled by City of Detroit in concert with community groups.',
-                       template: 'https://{switch:a,b,c,d}.tiles.mapbox.com/v4/jonahadkins.cjksmur6x34562qp9iv1u3ksf-54hev,jonahadkins.cjksmqxdx33jj2wp90xd9x2md-4e5y2/{z}/{x}/{y}.vector.pbf?access_token=pk.eyJ1Ijoiam9uYWhhZGtpbnMiLCJhIjoiRlVVVkx3VSJ9.9sdVEK_B_VkEXPjssU5MqA'
-                   }, {
-                       name: 'Detroit Composite POIs',
-                       src: 'composite-poi',
-                       tooltip: 'Fire Inspections, Business Licenses, and other public location data collated from the City of Detroit.',
-                       template: 'https://{switch:a,b,c,d}.tiles.mapbox.com/v4/jonahadkins.cjksmm6a02sli31myxhsr7zf3-2sw8h/{z}/{x}/{y}.vector.pbf?access_token=pk.eyJ1Ijoiam9uYWhhZGtpbnMiLCJhIjoiRlVVVkx3VSJ9.9sdVEK_B_VkEXPjssU5MqA'
-                   }, {
-                       name: 'Detroit All-The-Places POIs',
-                       src: 'alltheplaces-poi',
-                       tooltip: 'Public domain business location data created by web scrapers.',
-                       template: 'https://{switch:a,b,c,d}.tiles.mapbox.com/v4/jonahadkins.cjksmswgk340g2vo06p1w9w0j-8fjjc/{z}/{x}/{y}.vector.pbf?access_token=pk.eyJ1Ijoiam9uYWhhZGtpbnMiLCJhIjoiRlVVVkx3VSJ9.9sdVEK_B_VkEXPjssU5MqA'
-                   }
-               ];
+         function renderDisclosureContent(selection) {
+           var container = selection.selectAll('.nudge-container').data([0]);
+           var containerEnter = container.enter().append('div').attr('class', 'nudge-container');
+           containerEnter.append('div').attr('class', 'nudge-instructions').html(_t.html('background.offset'));
+           var nudgeWrapEnter = containerEnter.append('div').attr('class', 'nudge-controls-wrap');
+           var nudgeEnter = nudgeWrapEnter.append('div').attr('class', 'nudge-outer-rect').on(_pointerPrefix + 'down', dragOffset);
+           nudgeEnter.append('div').attr('class', 'nudge-inner-rect').append('input').attr('type', 'text').on('change', inputOffset);
+           nudgeWrapEnter.append('div').selectAll('button').data(_directions).enter().append('button').attr('class', function (d) {
+             return d[0] + ' nudge';
+           }).on('click', function (d3_event, d) {
+             nudge(d[1]);
+           });
+           nudgeWrapEnter.append('button').attr('title', _t('background.reset')).attr('class', 'nudge-reset disabled').on('click', function (d3_event) {
+             d3_event.preventDefault();
+             resetOffset();
+           }).call(svgIcon('#iD-icon-' + (_mainLocalizer.textDirection() === 'rtl' ? 'redo' : 'undo')));
+           updateValue();
+         }
 
-               // Only show this if the map is around Detroit..
-               var detroit = geoExtent([-83.5, 42.1], [-82.8, 42.5]);
-               var showVectorItems = (context.map().zoom() > 9 && detroit.contains(context.map().center()));
+         context.background().on('change.backgroundOffset-update', updateValue);
+         return section;
+       }
 
-               var container = selection.selectAll('.vectortile-container')
-                   .data(showVectorItems ? [0] : []);
+       function uiSectionOverlayList(context) {
+         var section = uiSection('overlay-list', context).label(_t.html('background.overlays')).disclosureContent(renderDisclosureContent);
 
-               container.exit()
-                   .remove();
+         var _overlayList = select(null);
 
-               var containerEnter = container.enter()
-                   .append('div')
-                   .attr('class', 'vectortile-container');
+         function setTooltips(selection) {
+           selection.each(function (d, i, nodes) {
+             var item = select(this).select('label');
+             var span = item.select('span');
+             var placement = i < nodes.length / 2 ? 'bottom' : 'top';
+             var description = d.description();
+             var isOverflowing = span.property('clientWidth') !== span.property('scrollWidth');
+             item.call(uiTooltip().destroyAny);
 
-               containerEnter
-                   .append('h4')
-                   .attr('class', 'vectortile-header')
-                   .text('Detroit Vector Tiles (Beta)');
+             if (description || isOverflowing) {
+               item.call(uiTooltip().placement(placement).title(description || d.name()));
+             }
+           });
+         }
 
-               containerEnter
-                   .append('ul')
-                   .attr('class', 'layer-list layer-list-vectortile');
+         function updateLayerSelections(selection) {
+           function active(d) {
+             return context.background().showsLayer(d);
+           }
 
-               containerEnter
-                   .append('div')
-                   .attr('class', 'vectortile-footer')
-                   .append('a')
-                   .attr('target', '_blank')
-                   .attr('tabindex', -1)
-                   .call(svgIcon('#iD-icon-out-link', 'inline'))
-                   .attr('href', 'https://github.com/osmus/detroit-mapping-challenge')
-                   .append('span')
-                   .text('About these layers');
+           selection.selectAll('li').classed('active', active).call(setTooltips).selectAll('input').property('checked', active);
+         }
 
-               container = container
-                   .merge(containerEnter);
+         function chooseOverlay(d3_event, d) {
+           d3_event.preventDefault();
+           context.background().toggleOverlayLayer(d);
 
+           _overlayList.call(updateLayerSelections);
 
-               var ul = container.selectAll('.layer-list-vectortile');
+           document.activeElement.blur();
+         }
 
-               var li = ul.selectAll('.list-item')
-                   .data(vtData);
+         function drawListItems(layerList, type, change, filter) {
+           var sources = context.background().sources(context.map().extent(), context.map().zoom(), true).filter(filter);
+           var layerLinks = layerList.selectAll('li').data(sources, function (d) {
+             return d.name();
+           });
+           layerLinks.exit().remove();
+           var enter = layerLinks.enter().append('li');
+           var label = enter.append('label');
+           label.append('input').attr('type', type).attr('name', 'layers').on('change', change);
+           label.append('span').html(function (d) {
+             return d.label();
+           });
+           layerList.selectAll('li').sort(sortSources);
+           layerList.call(updateLayerSelections);
 
-               li.exit()
-                   .remove();
+           function sortSources(a, b) {
+             return a.best() && !b.best() ? -1 : b.best() && !a.best() ? 1 : d3_descending(a.area(), b.area()) || d3_ascending(a.name(), b.name()) || 0;
+           }
+         }
 
-               var liEnter = li.enter()
-                   .append('li')
-                   .attr('class', function(d) { return 'list-item list-item-' + d.src; });
+         function renderDisclosureContent(selection) {
+           var container = selection.selectAll('.layer-overlay-list').data([0]);
+           _overlayList = container.enter().append('ul').attr('class', 'layer-list layer-overlay-list').attr('dir', 'auto').merge(container);
 
-               var labelEnter = liEnter
-                   .append('label')
-                   .each(function(d) {
-                       select(this).call(
-                           uiTooltip().title(d.tooltip).placement('top')
-                       );
-                   });
+           _overlayList.call(drawListItems, 'checkbox', chooseOverlay, function (d) {
+             return !d.isHidden() && d.overlay;
+           });
+         }
 
-               labelEnter
-                   .append('input')
-                   .attr('type', 'radio')
-                   .attr('name', 'vectortile')
-                   .on('change', selectVTLayer);
+         context.map().on('move.overlay_list', debounce(function () {
+           // layers in-view may have changed due to map move
+           window.requestIdleCallback(section.reRender);
+         }, 1000));
+         return section;
+       }
 
-               labelEnter
-                   .append('span')
-                   .text(function(d) { return d.name; });
+       function uiPaneBackground(context) {
+         var backgroundPane = uiPane('background', context).key(_t('background.key')).label(_t.html('background.title')).description(_t.html('background.description')).iconName('iD-icon-layers').sections([uiSectionBackgroundList(context), uiSectionOverlayList(context), uiSectionBackgroundDisplayOptions(context), uiSectionBackgroundOffset(context)]);
+         return backgroundPane;
+       }
 
-               // Update
-               li
-                   .merge(liEnter)
-                   .classed('active', isVTLayerSelected)
-                   .selectAll('input')
-                   .property('checked', isVTLayerSelected);
+       function uiPaneHelp(context) {
+         var docKeys = [['help', ['welcome', 'open_data_h', 'open_data', 'before_start_h', 'before_start', 'open_source_h', 'open_source', 'open_source_help']], ['overview', ['navigation_h', 'navigation_drag', 'navigation_zoom', 'features_h', 'features', 'nodes_ways']], ['editing', ['select_h', 'select_left_click', 'select_right_click', 'select_space', 'multiselect_h', 'multiselect', 'multiselect_shift_click', 'multiselect_lasso', 'undo_redo_h', 'undo_redo', 'save_h', 'save', 'save_validation', 'upload_h', 'upload', 'backups_h', 'backups', 'keyboard_h', 'keyboard']], ['feature_editor', ['intro', 'definitions', 'type_h', 'type', 'type_picker', 'fields_h', 'fields_all_fields', 'fields_example', 'fields_add_field', 'tags_h', 'tags_all_tags', 'tags_resources']], ['points', ['intro', 'add_point_h', 'add_point', 'add_point_finish', 'move_point_h', 'move_point', 'delete_point_h', 'delete_point', 'delete_point_command']], ['lines', ['intro', 'add_line_h', 'add_line', 'add_line_draw', 'add_line_continue', 'add_line_finish', 'modify_line_h', 'modify_line_dragnode', 'modify_line_addnode', 'connect_line_h', 'connect_line', 'connect_line_display', 'connect_line_drag', 'connect_line_tag', 'disconnect_line_h', 'disconnect_line_command', 'move_line_h', 'move_line_command', 'move_line_connected', 'delete_line_h', 'delete_line', 'delete_line_command']], ['areas', ['intro', 'point_or_area_h', 'point_or_area', 'add_area_h', 'add_area_command', 'add_area_draw', 'add_area_continue', 'add_area_finish', 'square_area_h', 'square_area_command', 'modify_area_h', 'modify_area_dragnode', 'modify_area_addnode', 'delete_area_h', 'delete_area', 'delete_area_command']], ['relations', ['intro', 'edit_relation_h', 'edit_relation', 'edit_relation_add', 'edit_relation_delete', 'maintain_relation_h', 'maintain_relation', 'relation_types_h', 'multipolygon_h', 'multipolygon', 'multipolygon_create', 'multipolygon_merge', 'turn_restriction_h', 'turn_restriction', 'turn_restriction_field', 'turn_restriction_editing', 'route_h', 'route', 'route_add', 'boundary_h', 'boundary', 'boundary_add']], ['operations', ['intro', 'intro_2', 'straighten', 'orthogonalize', 'circularize', 'move', 'rotate', 'reflect', 'continue', 'reverse', 'disconnect', 'split', 'extract', 'merge', 'delete', 'downgrade', 'copy_paste']], ['notes', ['intro', 'add_note_h', 'add_note', 'place_note', 'move_note', 'update_note_h', 'update_note', 'save_note_h', 'save_note']], ['imagery', ['intro', 'sources_h', 'choosing', 'sources', 'offsets_h', 'offset', 'offset_change']], ['streetlevel', ['intro', 'using_h', 'using', 'photos', 'viewer']], ['gps', ['intro', 'survey', 'using_h', 'using', 'tracing', 'upload']], ['qa', ['intro', 'tools_h', 'tools', 'issues_h', 'issues']]];
+         var headings = {
+           'help.help.open_data_h': 3,
+           'help.help.before_start_h': 3,
+           'help.help.open_source_h': 3,
+           'help.overview.navigation_h': 3,
+           'help.overview.features_h': 3,
+           'help.editing.select_h': 3,
+           'help.editing.multiselect_h': 3,
+           'help.editing.undo_redo_h': 3,
+           'help.editing.save_h': 3,
+           'help.editing.upload_h': 3,
+           'help.editing.backups_h': 3,
+           'help.editing.keyboard_h': 3,
+           'help.feature_editor.type_h': 3,
+           'help.feature_editor.fields_h': 3,
+           'help.feature_editor.tags_h': 3,
+           'help.points.add_point_h': 3,
+           'help.points.move_point_h': 3,
+           'help.points.delete_point_h': 3,
+           'help.lines.add_line_h': 3,
+           'help.lines.modify_line_h': 3,
+           'help.lines.connect_line_h': 3,
+           'help.lines.disconnect_line_h': 3,
+           'help.lines.move_line_h': 3,
+           'help.lines.delete_line_h': 3,
+           'help.areas.point_or_area_h': 3,
+           'help.areas.add_area_h': 3,
+           'help.areas.square_area_h': 3,
+           'help.areas.modify_area_h': 3,
+           'help.areas.delete_area_h': 3,
+           'help.relations.edit_relation_h': 3,
+           'help.relations.maintain_relation_h': 3,
+           'help.relations.relation_types_h': 2,
+           'help.relations.multipolygon_h': 3,
+           'help.relations.turn_restriction_h': 3,
+           'help.relations.route_h': 3,
+           'help.relations.boundary_h': 3,
+           'help.notes.add_note_h': 3,
+           'help.notes.update_note_h': 3,
+           'help.notes.save_note_h': 3,
+           'help.imagery.sources_h': 3,
+           'help.imagery.offsets_h': 3,
+           'help.streetlevel.using_h': 3,
+           'help.gps.using_h': 3,
+           'help.qa.tools_h': 3,
+           'help.qa.issues_h': 3
+         }; // For each section, squash all the texts into a single markdown document
+
+         var docs = docKeys.map(function (key) {
+           var helpkey = 'help.' + key[0];
+           var helpPaneReplacements = {
+             version: context.version
+           };
+           var text = key[1].reduce(function (all, part) {
+             var subkey = helpkey + '.' + part;
+             var depth = headings[subkey]; // is this subkey a heading?
+
+             var hhh = depth ? Array(depth + 1).join('#') + ' ' : ''; // if so, prepend with some ##'s
+
+             return all + hhh + helpHtml(subkey, helpPaneReplacements) + '\n\n';
+           }, '');
+           return {
+             title: _t.html(helpkey + '.title'),
+             content: marked_1(text.trim()) // use keyboard key styling for shortcuts
+             .replace(/<code>/g, '<kbd>').replace(/<\/code>/g, '<\/kbd>')
+           };
+         });
+         var helpPane = uiPane('help', context).key(_t('help.key')).label(_t.html('help.title')).description(_t.html('help.title')).iconName('iD-icon-help');
+
+         helpPane.renderContent = function (content) {
+           function clickHelp(d, i) {
+             var rtl = _mainLocalizer.textDirection() === 'rtl';
+             content.property('scrollTop', 0);
+             helpPane.selection().select('.pane-heading h2').html(d.title);
+             body.html(d.content);
+             body.selectAll('a').attr('target', '_blank');
+             menuItems.classed('selected', function (m) {
+               return m.title === d.title;
+             });
+             nav.html('');
 
+             if (rtl) {
+               nav.call(drawNext).call(drawPrevious);
+             } else {
+               nav.call(drawPrevious).call(drawNext);
+             }
 
-               function isVTLayerSelected(d) {
-                   return dataLayer && dataLayer.template() === d.template;
+             function drawNext(selection) {
+               if (i < docs.length - 1) {
+                 var nextLink = selection.append('a').attr('href', '#').attr('class', 'next').on('click', function (d3_event) {
+                   d3_event.preventDefault();
+                   clickHelp(docs[i + 1], i + 1);
+                 });
+                 nextLink.append('span').html(docs[i + 1].title).call(svgIcon(rtl ? '#iD-icon-backward' : '#iD-icon-forward', 'inline'));
                }
+             }
 
-               function selectVTLayer(d) {
-                   corePreferences('settings-custom-data-url', d.template);
-                   if (dataLayer) {
-                       dataLayer.template(d.template, d.src);
-                       dataLayer.enabled(true);
-                   }
+             function drawPrevious(selection) {
+               if (i > 0) {
+                 var prevLink = selection.append('a').attr('href', '#').attr('class', 'previous').on('click', function (d3_event) {
+                   d3_event.preventDefault();
+                   clickHelp(docs[i - 1], i - 1);
+                 });
+                 prevLink.call(svgIcon(rtl ? '#iD-icon-forward' : '#iD-icon-backward', 'inline')).append('span').html(docs[i - 1].title);
                }
+             }
            }
 
-           function drawCustomDataItems(selection) {
-               var dataLayer = layers.layer('data');
-               var hasData = dataLayer && dataLayer.hasData();
-               var showsData = hasData && dataLayer.enabled();
-
-               var ul = selection
-                   .selectAll('.layer-list-data')
-                   .data(dataLayer ? [0] : []);
+           function clickWalkthrough(d3_event) {
+             d3_event.preventDefault();
+             if (context.inIntro()) return;
+             context.container().call(uiIntro(context));
+             context.ui().togglePanes();
+           }
 
-               // Exit
-               ul.exit()
-                   .remove();
+           function clickShortcuts(d3_event) {
+             d3_event.preventDefault();
+             context.container().call(context.ui().shortcuts, true);
+           }
 
-               // Enter
-               var ulEnter = ul.enter()
-                   .append('ul')
-                   .attr('class', 'layer-list layer-list-data');
+           var toc = content.append('ul').attr('class', 'toc');
+           var menuItems = toc.selectAll('li').data(docs).enter().append('li').append('a').attr('href', '#').html(function (d) {
+             return d.title;
+           }).on('click', function (d3_event, d) {
+             d3_event.preventDefault();
+             clickHelp(d, docs.indexOf(d));
+           });
+           var shortcuts = toc.append('li').attr('class', 'shortcuts').call(uiTooltip().title(_t.html('shortcuts.tooltip')).keys(['?']).placement('top')).append('a').attr('href', '#').on('click', clickShortcuts);
+           shortcuts.append('div').html(_t.html('shortcuts.title'));
+           var walkthrough = toc.append('li').attr('class', 'walkthrough').append('a').attr('href', '#').on('click', clickWalkthrough);
+           walkthrough.append('svg').attr('class', 'logo logo-walkthrough').append('use').attr('xlink:href', '#iD-logo-walkthrough');
+           walkthrough.append('div').html(_t.html('splash.walkthrough'));
+           var helpContent = content.append('div').attr('class', 'left-content');
+           var body = helpContent.append('div').attr('class', 'body');
+           var nav = helpContent.append('div').attr('class', 'nav');
+           clickHelp(docs[0], 0);
+         };
 
-               var liEnter = ulEnter
-                   .append('li')
-                   .attr('class', 'list-item-data');
+         return helpPane;
+       }
 
-               var labelEnter = liEnter
-                   .append('label')
-                   .call(uiTooltip()
-                       .title(_t('map_data.layers.custom.tooltip'))
-                       .placement('top')
-                   );
+       function uiSectionValidationIssues(id, severity, context) {
+         var _issues = [];
+         var section = uiSection(id, context).label(function () {
+           if (!_issues) return '';
+           var issueCountText = _issues.length > 1000 ? '1000+' : String(_issues.length);
+           return _t('inspector.title_count', {
+             title: _t.html('issues.' + severity + 's.list_title'),
+             count: issueCountText
+           });
+         }).disclosureContent(renderDisclosureContent).shouldDisplay(function () {
+           return _issues && _issues.length;
+         });
 
-               labelEnter
-                   .append('input')
-                   .attr('type', 'checkbox')
-                   .on('change', function() { toggleLayer('data'); });
+         function getOptions() {
+           return {
+             what: corePreferences('validate-what') || 'edited',
+             where: corePreferences('validate-where') || 'all'
+           };
+         } // get and cache the issues to display, unordered
 
-               labelEnter
-                   .append('span')
-                   .text(_t('map_data.layers.custom.title'));
 
-               liEnter
-                   .append('button')
-                   .call(uiTooltip()
-                       .title(_t('settings.custom_data.tooltip'))
-                       .placement((_mainLocalizer.textDirection() === 'rtl') ? 'right' : 'left')
-                   )
-                   .on('click', editCustom)
-                   .call(svgIcon('#iD-icon-more'));
+         function reloadIssues() {
+           _issues = context.validator().getIssuesBySeverity(getOptions())[severity];
+         }
 
-               liEnter
-                   .append('button')
-                   .call(uiTooltip()
-                       .title(_t('map_data.layers.custom.zoom'))
-                       .placement((_mainLocalizer.textDirection() === 'rtl') ? 'right' : 'left')
-                   )
-                   .on('click', function() {
-                       event.preventDefault();
-                       event.stopPropagation();
-                       dataLayer.fitZoom();
-                   })
-                   .call(svgIcon('#iD-icon-framed-dot'));
+         function renderDisclosureContent(selection) {
+           var center = context.map().center();
+           var graph = context.graph(); // sort issues by distance away from the center of the map
 
-               // Update
-               ul = ul
-                   .merge(ulEnter);
+           var issues = _issues.map(function withDistance(issue) {
+             var extent = issue.extent(graph);
+             var dist = extent ? geoSphericalDistance(center, extent.center()) : 0;
+             return Object.assign(issue, {
+               dist: dist
+             });
+           }).sort(function byDistance(a, b) {
+             return a.dist - b.dist;
+           }); // cut off at 1000
 
-               ul.selectAll('.list-item-data')
-                   .classed('active', showsData)
-                   .selectAll('label')
-                   .classed('deemphasize', !hasData)
-                   .selectAll('input')
-                   .property('disabled', !hasData)
-                   .property('checked', showsData);
-           }
 
-           function editCustom() {
-               event.preventDefault();
-               context.container()
-                   .call(settingsCustomData);
-           }
+           issues = issues.slice(0, 1000); //renderIgnoredIssuesReset(_warningsSelection);
 
-           function customChanged(d) {
-               var dataLayer = layers.layer('data');
+           selection.call(drawIssuesList, issues);
+         }
 
-               if (d && d.url) {
-                   dataLayer.url(d.url);
-               } else if (d && d.fileList) {
-                   dataLayer.fileList(d.fileList);
-               }
-           }
+         function drawIssuesList(selection, issues) {
+           var list = selection.selectAll('.issues-list').data([0]);
+           list = list.enter().append('ul').attr('class', 'layer-list issues-list ' + severity + 's-list').merge(list);
+           var items = list.selectAll('li').data(issues, function (d) {
+             return d.id;
+           }); // Exit
 
+           items.exit().remove(); // Enter
 
-           function drawPanelItems(selection) {
+           var itemsEnter = items.enter().append('li').attr('class', function (d) {
+             return 'issue severity-' + d.severity;
+           });
+           var labelsEnter = itemsEnter.append('button').attr('class', 'issue-label').on('click', function (d3_event, d) {
+             context.validator().focusIssue(d);
+           }).on('mouseover', function (d3_event, d) {
+             utilHighlightEntities(d.entityIds, true, context);
+           }).on('mouseout', function (d3_event, d) {
+             utilHighlightEntities(d.entityIds, false, context);
+           });
+           var textEnter = labelsEnter.append('span').attr('class', 'issue-text');
+           textEnter.append('span').attr('class', 'issue-icon').each(function (d) {
+             var iconName = '#iD-icon-' + (d.severity === 'warning' ? 'alert' : 'error');
+             select(this).call(svgIcon(iconName));
+           });
+           textEnter.append('span').attr('class', 'issue-message');
+           /*
+           labelsEnter
+               .append('span')
+               .attr('class', 'issue-autofix')
+               .each(function(d) {
+                   if (!d.autoFix) return;
+                    d3_select(this)
+                       .append('button')
+                       .attr('title', t('issues.fix_one.title'))
+                       .datum(d.autoFix)  // set button datum to the autofix
+                       .attr('class', 'autofix action')
+                       .on('click', function(d3_event, d) {
+                           d3_event.preventDefault();
+                           d3_event.stopPropagation();
+                            var issuesEntityIDs = d.issue.entityIds;
+                           utilHighlightEntities(issuesEntityIDs.concat(d.entityIds), false, context);
+                            context.perform.apply(context, d.autoArgs);
+                           context.validator().validate();
+                       })
+                       .call(svgIcon('#iD-icon-wrench'));
+               });
+           */
+           // Update
 
-               var panelsListEnter = selection.selectAll('.md-extras-list')
-                   .data([0])
-                   .enter()
-                   .append('ul')
-                   .attr('class', 'layer-list md-extras-list');
-
-               var historyPanelLabelEnter = panelsListEnter
-                   .append('li')
-                   .attr('class', 'history-panel-toggle-item')
-                   .append('label')
-                   .call(uiTooltip()
-                       .title(_t('map_data.history_panel.tooltip'))
-                       .keys([uiCmd('⌘⇧' + _t('info_panels.history.key'))])
-                       .placement('top')
-                   );
-
-               historyPanelLabelEnter
-                   .append('input')
-                   .attr('type', 'checkbox')
-                   .on('change', function() {
-                       event.preventDefault();
-                       context.ui().info.toggle('history');
+           items = items.merge(itemsEnter).order();
+           items.selectAll('.issue-message').html(function (d) {
+             return d.message(context);
+           });
+           /*
+           // autofix
+           var canAutoFix = issues.filter(function(issue) { return issue.autoFix; });
+            var autoFixAll = selection.selectAll('.autofix-all')
+               .data(canAutoFix.length ? [0] : []);
+            // exit
+           autoFixAll.exit()
+               .remove();
+            // enter
+           var autoFixAllEnter = autoFixAll.enter()
+               .insert('div', '.issues-list')
+               .attr('class', 'autofix-all');
+            var linkEnter = autoFixAllEnter
+               .append('a')
+               .attr('class', 'autofix-all-link')
+               .attr('href', '#');
+            linkEnter
+               .append('span')
+               .attr('class', 'autofix-all-link-text')
+               .html(t.html('issues.fix_all.title'));
+            linkEnter
+               .append('span')
+               .attr('class', 'autofix-all-link-icon')
+               .call(svgIcon('#iD-icon-wrench'));
+            if (severity === 'warning') {
+               renderIgnoredIssuesReset(selection);
+           }
+            // update
+           autoFixAll = autoFixAll
+               .merge(autoFixAllEnter);
+            autoFixAll.selectAll('.autofix-all-link')
+               .on('click', function() {
+                   context.pauseChangeDispatch();
+                   context.perform(actionNoop());
+                   canAutoFix.forEach(function(issue) {
+                       var args = issue.autoFix.autoArgs.slice();  // copy
+                       if (typeof args[args.length - 1] !== 'function') {
+                           args.pop();
+                       }
+                       args.push(t('issues.fix_all.annotation'));
+                       context.replace.apply(context, args);
                    });
+                   context.resumeChangeDispatch();
+                   context.validator().validate();
+               });
+           */
+         }
 
-               historyPanelLabelEnter
-                   .append('span')
-                   .text(_t('map_data.history_panel.title'));
-
-               var measurementPanelLabelEnter = panelsListEnter
-                   .append('li')
-                   .attr('class', 'measurement-panel-toggle-item')
-                   .append('label')
-                   .call(uiTooltip()
-                       .title(_t('map_data.measurement_panel.tooltip'))
-                       .keys([uiCmd('⌘⇧' + _t('info_panels.measurement.key'))])
-                       .placement('top')
-                   );
-
-               measurementPanelLabelEnter
-                   .append('input')
-                   .attr('type', 'checkbox')
-                   .on('change', function() {
-                       event.preventDefault();
-                       context.ui().info.toggle('measurement');
-                   });
+         context.validator().on('validated.uiSectionValidationIssues' + id, function () {
+           window.requestIdleCallback(function () {
+             reloadIssues();
+             section.reRender();
+           });
+         });
+         context.map().on('move.uiSectionValidationIssues' + id, debounce(function () {
+           window.requestIdleCallback(function () {
+             if (getOptions().where === 'visible') {
+               // must refetch issues if they are viewport-dependent
+               reloadIssues();
+             } // always reload list to re-sort-by-distance
 
-               measurementPanelLabelEnter
-                   .append('span')
-                   .text(_t('map_data.measurement_panel.title'));
-           }
 
-           context.layers().on('change.uiSectionDataLayers', section.reRender);
+             section.reRender();
+           });
+         }, 1000));
+         return section;
+       }
 
-           context.map()
-               .on('move.uiSectionDataLayers',
-                   debounce(function() {
-                       // Detroit layers may have moved in or out of view
-                       window.requestIdleCallback(section.reRender);
-                   }, 1000)
-               );
+       function uiSectionValidationOptions(context) {
+         var section = uiSection('issues-options', context).content(renderContent);
+
+         function renderContent(selection) {
+           var container = selection.selectAll('.issues-options-container').data([0]);
+           container = container.enter().append('div').attr('class', 'issues-options-container').merge(container);
+           var data = [{
+             key: 'what',
+             values: ['edited', 'all']
+           }, {
+             key: 'where',
+             values: ['visible', 'all']
+           }];
+           var options = container.selectAll('.issues-option').data(data, function (d) {
+             return d.key;
+           });
+           var optionsEnter = options.enter().append('div').attr('class', function (d) {
+             return 'issues-option issues-option-' + d.key;
+           });
+           optionsEnter.append('div').attr('class', 'issues-option-title').html(function (d) {
+             return _t.html('issues.options.' + d.key + '.title');
+           });
+           var valuesEnter = optionsEnter.selectAll('label').data(function (d) {
+             return d.values.map(function (val) {
+               return {
+                 value: val,
+                 key: d.key
+               };
+             });
+           }).enter().append('label');
+           valuesEnter.append('input').attr('type', 'radio').attr('name', function (d) {
+             return 'issues-option-' + d.key;
+           }).attr('value', function (d) {
+             return d.value;
+           }).property('checked', function (d) {
+             return getOptions()[d.key] === d.value;
+           }).on('change', function (d3_event, d) {
+             updateOptionValue(d3_event, d.key, d.value);
+           });
+           valuesEnter.append('span').html(function (d) {
+             return _t.html('issues.options.' + d.key + '.' + d.value);
+           });
+         }
 
-           return section;
-       }
+         function getOptions() {
+           return {
+             what: corePreferences('validate-what') || 'edited',
+             // 'all', 'edited'
+             where: corePreferences('validate-where') || 'all' // 'all', 'visible'
 
-       function uiSectionMapFeatures(context) {
+           };
+         }
+
+         function updateOptionValue(d3_event, d, val) {
+           if (!val && d3_event && d3_event.target) {
+             val = d3_event.target.value;
+           }
 
-           var _features = context.features().keys();
+           corePreferences('validate-' + d, val);
+           context.validator().validate();
+         }
 
-           var section = uiSection('map-features', context)
-               .title(_t('map_data.map_features'))
-               .disclosureContent(renderDisclosureContent)
-               .expandedByDefault(false);
+         return section;
+       }
 
-           function renderDisclosureContent(selection) {
+       function uiSectionValidationRules(context) {
+         var MINSQUARE = 0;
+         var MAXSQUARE = 20;
+         var DEFAULTSQUARE = 5; // see also unsquare_way.js
 
-               var container = selection.selectAll('.layer-feature-list-container')
-                   .data([0]);
+         var section = uiSection('issues-rules', context).disclosureContent(renderDisclosureContent).label(_t.html('issues.rules.title'));
 
-               var containerEnter = container.enter()
-                   .append('div')
-                   .attr('class', 'layer-feature-list-container');
+         var _ruleKeys = context.validator().getRuleKeys().filter(function (key) {
+           return key !== 'maprules';
+         }).sort(function (key1, key2) {
+           // alphabetize by localized title
+           return _t('issues.' + key1 + '.title') < _t('issues.' + key2 + '.title') ? -1 : 1;
+         });
 
-               containerEnter
-                   .append('ul')
-                   .attr('class', 'layer-list layer-feature-list');
+         function renderDisclosureContent(selection) {
+           var container = selection.selectAll('.issues-rulelist-container').data([0]);
+           var containerEnter = container.enter().append('div').attr('class', 'issues-rulelist-container');
+           containerEnter.append('ul').attr('class', 'layer-list issue-rules-list');
+           var ruleLinks = containerEnter.append('div').attr('class', 'issue-rules-links section-footer');
+           ruleLinks.append('a').attr('class', 'issue-rules-link').attr('href', '#').html(_t.html('issues.disable_all')).on('click', function (d3_event) {
+             d3_event.preventDefault();
+             context.validator().disableRules(_ruleKeys);
+           });
+           ruleLinks.append('a').attr('class', 'issue-rules-link').attr('href', '#').html(_t.html('issues.enable_all')).on('click', function (d3_event) {
+             d3_event.preventDefault();
+             context.validator().disableRules([]);
+           }); // Update
 
-               var footer = containerEnter
-                   .append('div')
-                   .attr('class', 'feature-list-links section-footer');
-
-               footer
-                   .append('a')
-                   .attr('class', 'feature-list-link')
-                   .attr('href', '#')
-                   .text(_t('issues.enable_all'))
-                   .on('click', function() {
-                       context.features().enableAll();
-                   });
+           container = container.merge(containerEnter);
+           container.selectAll('.issue-rules-list').call(drawListItems, _ruleKeys, 'checkbox', 'rule', toggleRule, isRuleEnabled);
+         }
 
-               footer
-                   .append('a')
-                   .attr('class', 'feature-list-link')
-                   .attr('href', '#')
-                   .text(_t('issues.disable_all'))
-                   .on('click', function() {
-                       context.features().disableAll();
-                   });
+         function drawListItems(selection, data, type, name, change, active) {
+           var items = selection.selectAll('li').data(data); // Exit
+
+           items.exit().remove(); // Enter
 
-               // Update
-               container = container
-                   .merge(containerEnter);
+           var enter = items.enter().append('li');
 
-               container.selectAll('.layer-feature-list')
-                   .call(drawListItems, _features, 'checkbox', 'feature', clickFeature, showsFeature);
+           if (name === 'rule') {
+             enter.call(uiTooltip().title(function (d) {
+               return _t.html('issues.' + d + '.tip');
+             }).placement('top'));
            }
 
-           function drawListItems(selection, data, type, name, change, active) {
-               var items = selection.selectAll('li')
-                   .data(data);
+           var label = enter.append('label');
+           label.append('input').attr('type', type).attr('name', name).on('change', change);
+           label.append('span').html(function (d) {
+             var params = {};
 
-               // Exit
-               items.exit()
-                   .remove();
+             if (d === 'unsquare_way') {
+               params.val = '<span class="square-degrees"></span>';
+             }
 
-               // Enter
-               var enter = items.enter()
-                   .append('li')
-                   .call(uiTooltip()
-                       .title(function(d) {
-                           var tip = _t(name + '.' + d + '.tooltip');
-                           if (autoHiddenFeature(d)) {
-                               var msg = showsLayer('osm') ? _t('map_data.autohidden') : _t('map_data.osmhidden');
-                               tip += '<div>' + msg + '</div>';
-                           }
-                           return tip;
-                       })
-                       .placement('top')
-                   );
+             return _t.html('issues.' + d + '.title', params);
+           }); // Update
+
+           items = items.merge(enter);
+           items.classed('active', active).selectAll('input').property('checked', active).property('indeterminate', false); // user-configurable square threshold
 
-               var label = enter
-                   .append('label');
+           var degStr = corePreferences('validate-square-degrees');
 
-               label
-                   .append('input')
-                   .attr('type', type)
-                   .attr('name', name)
-                   .on('change', change);
+           if (degStr === null) {
+             degStr = DEFAULTSQUARE.toString();
+           }
 
-               label
-                   .append('span')
-                   .text(function(d) { return _t(name + '.' + d + '.description'); });
+           var span = items.selectAll('.square-degrees');
+           var input = span.selectAll('.square-degrees-input').data([0]); // enter / update
 
-               // Update
-               items = items
-                   .merge(enter);
+           input.enter().append('input').attr('type', 'number').attr('min', MINSQUARE.toString()).attr('max', MAXSQUARE.toString()).attr('step', '0.5').attr('class', 'square-degrees-input').call(utilNoAuto).on('click', function (d3_event) {
+             d3_event.preventDefault();
+             d3_event.stopPropagation();
+             this.select();
+           }).on('keyup', function (d3_event) {
+             if (d3_event.keyCode === 13) {
+               // ↩ Return
+               this.blur();
+               this.select();
+             }
+           }).on('blur', changeSquare).merge(input).property('value', degStr);
+         }
 
-               items
-                   .classed('active', active)
-                   .selectAll('input')
-                   .property('checked', active)
-                   .property('indeterminate', autoHiddenFeature);
-           }
+         function changeSquare() {
+           var input = select(this);
+           var degStr = utilGetSetValue(input).trim();
+           var degNum = parseFloat(degStr, 10);
 
-           function autoHiddenFeature(d) {
-               return context.features().autoHidden(d);
+           if (!isFinite(degNum)) {
+             degNum = DEFAULTSQUARE;
+           } else if (degNum > MAXSQUARE) {
+             degNum = MAXSQUARE;
+           } else if (degNum < MINSQUARE) {
+             degNum = MINSQUARE;
            }
 
-           function showsFeature(d) {
-               return context.features().enabled(d);
-           }
+           degNum = Math.round(degNum * 10) / 10; // round to 1 decimal
 
-           function clickFeature(d) {
-               context.features().toggle(d);
-           }
+           degStr = degNum.toString();
+           input.property('value', degStr);
+           corePreferences('validate-square-degrees', degStr);
+           context.validator().reloadUnsquareIssues();
+         }
 
-           function showsLayer(id) {
-               var layer = context.layers().layer(id);
-               return layer && layer.enabled();
-           }
+         function isRuleEnabled(d) {
+           return context.validator().isRuleEnabled(d);
+         }
 
-           // add listeners
-           context.features()
-               .on('change.map_features', section.reRender);
+         function toggleRule(d3_event, d) {
+           context.validator().toggleRule(d);
+         }
 
-           return section;
+         context.validator().on('validated.uiSectionValidationRules', function () {
+           window.requestIdleCallback(section.reRender);
+         });
+         return section;
        }
 
-       function uiSectionMapStyleOptions(context) {
+       function uiSectionValidationStatus(context) {
+         var section = uiSection('issues-status', context).content(renderContent).shouldDisplay(function () {
+           var issues = context.validator().getIssues(getOptions());
+           return issues.length === 0;
+         });
 
-           var section = uiSection('fill-area', context)
-               .title(_t('map_data.style_options'))
-               .disclosureContent(renderDisclosureContent)
-               .expandedByDefault(false);
-
-           function renderDisclosureContent(selection) {
-               var container = selection.selectAll('.layer-fill-list')
-                   .data([0]);
-
-               container.enter()
-                   .append('ul')
-                   .attr('class', 'layer-list layer-fill-list')
-                   .merge(container)
-                   .call(drawListItems, context.map().areaFillOptions, 'radio', 'area_fill', setFill, isActiveFill);
-
-               var container2 = selection.selectAll('.layer-visual-diff-list')
-                   .data([0]);
-
-               container2.enter()
-                   .append('ul')
-                   .attr('class', 'layer-list layer-visual-diff-list')
-                   .merge(container2)
-                   .call(drawListItems, ['highlight_edits'], 'checkbox', 'visual_diff', toggleHighlightEdited, function() {
-                       return context.surface().classed('highlight-edited');
-                   });
-           }
+         function getOptions() {
+           return {
+             what: corePreferences('validate-what') || 'edited',
+             where: corePreferences('validate-where') || 'all'
+           };
+         }
 
-           function drawListItems(selection, data, type, name, change, active) {
-               var items = selection.selectAll('li')
-                   .data(data);
+         function renderContent(selection) {
+           var box = selection.selectAll('.box').data([0]);
+           var boxEnter = box.enter().append('div').attr('class', 'box');
+           boxEnter.append('div').call(svgIcon('#iD-icon-apply', 'pre-text'));
+           var noIssuesMessage = boxEnter.append('span');
+           noIssuesMessage.append('strong').attr('class', 'message');
+           noIssuesMessage.append('br');
+           noIssuesMessage.append('span').attr('class', 'details');
+           renderIgnoredIssuesReset(selection);
+           setNoIssuesText(selection);
+         }
 
-               // Exit
-               items.exit()
-                   .remove();
+         function renderIgnoredIssuesReset(selection) {
+           var ignoredIssues = context.validator().getIssues({
+             what: 'all',
+             where: 'all',
+             includeDisabledRules: true,
+             includeIgnored: 'only'
+           });
+           var resetIgnored = selection.selectAll('.reset-ignored').data(ignoredIssues.length ? [0] : []); // exit
 
-               // Enter
-               var enter = items.enter()
-                   .append('li')
-                   .call(uiTooltip()
-                       .title(function(d) {
-                           return _t(name + '.' + d + '.tooltip');
-                       })
-                       .keys(function(d) {
-                           var key = (d === 'wireframe' ? _t('area_fill.wireframe.key') : null);
-                           if (d === 'highlight_edits') key = _t('map_data.highlight_edits.key');
-                           return key ? [key] : null;
-                       })
-                       .placement('top')
-                   );
+           resetIgnored.exit().remove(); // enter
 
-               var label = enter
-                   .append('label');
+           var resetIgnoredEnter = resetIgnored.enter().append('div').attr('class', 'reset-ignored section-footer');
+           resetIgnoredEnter.append('a').attr('href', '#'); // update
 
-               label
-                   .append('input')
-                   .attr('type', type)
-                   .attr('name', name)
-                   .on('change', change);
+           resetIgnored = resetIgnored.merge(resetIgnoredEnter);
+           resetIgnored.select('a').html(_t('inspector.title_count', {
+             title: _t.html('issues.reset_ignored'),
+             count: ignoredIssues.length
+           }));
+           resetIgnored.on('click', function (d3_event) {
+             d3_event.preventDefault();
+             context.validator().resetIgnoredIssues();
+           });
+         }
 
-               label
-                   .append('span')
-                   .text(function(d) { return _t(name + '.' + d + '.description'); });
+         function setNoIssuesText(selection) {
+           var opts = getOptions();
 
-               // Update
-               items = items
-                   .merge(enter);
+           function checkForHiddenIssues(cases) {
+             for (var type in cases) {
+               var hiddenOpts = cases[type];
+               var hiddenIssues = context.validator().getIssues(hiddenOpts);
 
-               items
-                   .classed('active', active)
-                   .selectAll('input')
-                   .property('checked', active)
-                   .property('indeterminate', false);
-           }
+               if (hiddenIssues.length) {
+                 selection.select('.box .details').html(_t.html('issues.no_issues.hidden_issues.' + type, {
+                   count: hiddenIssues.length.toString()
+                 }));
+                 return;
+               }
+             }
 
-           function isActiveFill(d) {
-               return context.map().activeAreaFill() === d;
+             selection.select('.box .details').html(_t.html('issues.no_issues.hidden_issues.none'));
            }
 
-           function toggleHighlightEdited() {
-               event.preventDefault();
-               context.map().toggleHighlightEdited();
+           var messageType;
+
+           if (opts.what === 'edited' && opts.where === 'visible') {
+             messageType = 'edits_in_view';
+             checkForHiddenIssues({
+               elsewhere: {
+                 what: 'edited',
+                 where: 'all'
+               },
+               everything_else: {
+                 what: 'all',
+                 where: 'visible'
+               },
+               disabled_rules: {
+                 what: 'edited',
+                 where: 'visible',
+                 includeDisabledRules: 'only'
+               },
+               everything_else_elsewhere: {
+                 what: 'all',
+                 where: 'all'
+               },
+               disabled_rules_elsewhere: {
+                 what: 'edited',
+                 where: 'all',
+                 includeDisabledRules: 'only'
+               },
+               ignored_issues: {
+                 what: 'edited',
+                 where: 'visible',
+                 includeIgnored: 'only'
+               },
+               ignored_issues_elsewhere: {
+                 what: 'edited',
+                 where: 'all',
+                 includeIgnored: 'only'
+               }
+             });
+           } else if (opts.what === 'edited' && opts.where === 'all') {
+             messageType = 'edits';
+             checkForHiddenIssues({
+               everything_else: {
+                 what: 'all',
+                 where: 'all'
+               },
+               disabled_rules: {
+                 what: 'edited',
+                 where: 'all',
+                 includeDisabledRules: 'only'
+               },
+               ignored_issues: {
+                 what: 'edited',
+                 where: 'all',
+                 includeIgnored: 'only'
+               }
+             });
+           } else if (opts.what === 'all' && opts.where === 'visible') {
+             messageType = 'everything_in_view';
+             checkForHiddenIssues({
+               elsewhere: {
+                 what: 'all',
+                 where: 'all'
+               },
+               disabled_rules: {
+                 what: 'all',
+                 where: 'visible',
+                 includeDisabledRules: 'only'
+               },
+               disabled_rules_elsewhere: {
+                 what: 'all',
+                 where: 'all',
+                 includeDisabledRules: 'only'
+               },
+               ignored_issues: {
+                 what: 'all',
+                 where: 'visible',
+                 includeIgnored: 'only'
+               },
+               ignored_issues_elsewhere: {
+                 what: 'all',
+                 where: 'all',
+                 includeIgnored: 'only'
+               }
+             });
+           } else if (opts.what === 'all' && opts.where === 'all') {
+             messageType = 'everything';
+             checkForHiddenIssues({
+               disabled_rules: {
+                 what: 'all',
+                 where: 'all',
+                 includeDisabledRules: 'only'
+               },
+               ignored_issues: {
+                 what: 'all',
+                 where: 'all',
+                 includeIgnored: 'only'
+               }
+             });
            }
 
-           function setFill(d) {
-               context.map().activeAreaFill(d);
+           if (opts.what === 'edited' && context.history().difference().summary().length === 0) {
+             messageType = 'no_edits';
            }
 
-           context.map()
-               .on('changeHighlighting.ui_style, changeAreaFill.ui_style', section.reRender);
+           selection.select('.box .message').html(_t.html('issues.no_issues.message.' + messageType));
+         }
 
-           return section;
+         context.validator().on('validated.uiSectionValidationStatus', function () {
+           window.requestIdleCallback(section.reRender);
+         });
+         context.map().on('move.uiSectionValidationStatus', debounce(function () {
+           window.requestIdleCallback(section.reRender);
+         }, 1000));
+         return section;
        }
 
-       function uiSectionPhotoOverlays(context) {
+       function uiPaneIssues(context) {
+         var issuesPane = uiPane('issues', context).key(_t('issues.key')).label(_t.html('issues.title')).description(_t.html('issues.title')).iconName('iD-icon-alert').sections([uiSectionValidationOptions(context), uiSectionValidationStatus(context), uiSectionValidationIssues('issues-errors', 'error', context), uiSectionValidationIssues('issues-warnings', 'warning', context), uiSectionValidationRules(context)]);
+         return issuesPane;
+       }
 
-           var layers = context.layers();
+       function uiSettingsCustomData(context) {
+         var dispatch$1 = dispatch('change');
+
+         function render(selection) {
+           var dataLayer = context.layers().layer('data'); // keep separate copies of original and current settings
+
+           var _origSettings = {
+             fileList: dataLayer && dataLayer.fileList() || null,
+             url: corePreferences('settings-custom-data-url')
+           };
+           var _currSettings = {
+             fileList: dataLayer && dataLayer.fileList() || null,
+             url: corePreferences('settings-custom-data-url')
+           }; // var example = 'https://{switch:a,b,c}.tile.openstreetmap.org/{zoom}/{x}/{y}.png';
+
+           var modal = uiConfirm(selection).okButton();
+           modal.classed('settings-modal settings-custom-data', true);
+           modal.select('.modal-section.header').append('h3').html(_t.html('settings.custom_data.header'));
+           var textSection = modal.select('.modal-section.message-text');
+           textSection.append('pre').attr('class', 'instructions-file').html(_t.html('settings.custom_data.file.instructions'));
+           textSection.append('input').attr('class', 'field-file').attr('type', 'file').property('files', _currSettings.fileList) // works for all except IE11
+           .on('change', function (d3_event) {
+             var files = d3_event.target.files;
+
+             if (files && files.length) {
+               _currSettings.url = '';
+               textSection.select('.field-url').property('value', '');
+               _currSettings.fileList = files;
+             } else {
+               _currSettings.fileList = null;
+             }
+           });
+           textSection.append('h4').html(_t.html('settings.custom_data.or'));
+           textSection.append('pre').attr('class', 'instructions-url').html(_t.html('settings.custom_data.url.instructions'));
+           textSection.append('textarea').attr('class', 'field-url').attr('placeholder', _t('settings.custom_data.url.placeholder')).call(utilNoAuto).property('value', _currSettings.url); // insert a cancel button
 
-           var section = uiSection('photo-overlays', context)
-               .title(_t('photo_overlays.title'))
-               .disclosureContent(renderDisclosureContent)
-               .expandedByDefault(false);
+           var buttonSection = modal.select('.modal-section.buttons');
+           buttonSection.insert('button', '.ok-button').attr('class', 'button cancel-button secondary-action').html(_t.html('confirm.cancel'));
+           buttonSection.select('.cancel-button').on('click.cancel', clickCancel);
+           buttonSection.select('.ok-button').attr('disabled', isSaveDisabled).on('click.save', clickSave);
 
-           function renderDisclosureContent(selection) {
-               var container = selection.selectAll('.photo-overlay-container')
-                   .data([0]);
+           function isSaveDisabled() {
+             return null;
+           } // restore the original url
 
-               container.enter()
-                   .append('div')
-                   .attr('class', 'photo-overlay-container')
-                   .merge(container)
-                   .call(drawPhotoItems)
-                   .call(drawPhotoTypeItems);
-           }
 
-           function drawPhotoItems(selection) {
-               var photoKeys = context.photos().overlayLayerIDs();
-               var photoLayers = layers.all().filter(function(obj) { return photoKeys.indexOf(obj.id) !== -1; });
-               var data = photoLayers.filter(function(obj) { return obj.layer.supported(); });
+           function clickCancel() {
+             textSection.select('.field-url').property('value', _origSettings.url);
+             corePreferences('settings-custom-data-url', _origSettings.url);
+             this.blur();
+             modal.close();
+           } // accept the current url
 
-               function layerSupported(d) {
-                   return d.layer && d.layer.supported();
-               }
-               function layerEnabled(d) {
-                   return layerSupported(d) && d.layer.enabled();
-               }
 
-               var ul = selection
-                   .selectAll('.layer-list-photos')
-                   .data([0]);
+           function clickSave() {
+             _currSettings.url = textSection.select('.field-url').property('value').trim(); // one or the other but not both
 
-               ul = ul.enter()
-                   .append('ul')
-                   .attr('class', 'layer-list layer-list-photos')
-                   .merge(ul);
+             if (_currSettings.url) {
+               _currSettings.fileList = null;
+             }
 
-               var li = ul.selectAll('.list-item-photos')
-                   .data(data);
+             if (_currSettings.fileList) {
+               _currSettings.url = '';
+             }
 
-               li.exit()
-                   .remove();
+             corePreferences('settings-custom-data-url', _currSettings.url);
+             this.blur();
+             modal.close();
+             dispatch$1.call('change', this, _currSettings);
+           }
+         }
 
-               var liEnter = li.enter()
-                   .append('li')
-                   .attr('class', function(d) {
-                       var classes = 'list-item-photos list-item-' + d.id;
-                       if (d.id === 'mapillary-signs' || d.id === 'mapillary-map-features') {
-                           classes += ' indented';
-                       }
-                       return classes;
-                   });
+         return utilRebind(render, dispatch$1, 'on');
+       }
 
-               var labelEnter = liEnter
-                   .append('label')
-                   .each(function(d) {
-                       var titleID;
-                       if (d.id === 'mapillary-signs') titleID = 'mapillary.signs.tooltip';
-                       else if (d.id === 'mapillary') titleID = 'mapillary_images.tooltip';
-                       else if (d.id === 'openstreetcam') titleID = 'openstreetcam_images.tooltip';
-                       else titleID = d.id.replace(/-/g, '_') + '.tooltip';
-                       select(this)
-                           .call(uiTooltip()
-                               .title(_t(titleID))
-                               .placement('top')
-                           );
-                   });
+       function uiSectionDataLayers(context) {
+         var settingsCustomData = uiSettingsCustomData(context).on('change', customChanged);
+         var layers = context.layers();
+         var section = uiSection('data-layers', context).label(_t.html('map_data.data_layers')).disclosureContent(renderDisclosureContent);
 
-               labelEnter
-                   .append('input')
-                   .attr('type', 'checkbox')
-                   .on('change', function(d) { toggleLayer(d.id); });
-
-               labelEnter
-                   .append('span')
-                   .text(function(d) {
-                       var id = d.id;
-                       if (id === 'mapillary-signs') id = 'photo_overlays.traffic_signs';
-                       return _t(id.replace(/-/g, '_') + '.title');
-                   });
+         function renderDisclosureContent(selection) {
+           var container = selection.selectAll('.data-layer-container').data([0]);
+           container.enter().append('div').attr('class', 'data-layer-container').merge(container).call(drawOsmItems).call(drawQAItems).call(drawCustomDataItems).call(drawVectorItems) // Beta - Detroit mapping challenge
+           .call(drawPanelItems);
+         }
 
+         function showsLayer(which) {
+           var layer = layers.layer(which);
 
-               // Update
-               li
-                   .merge(liEnter)
-                   .classed('active', layerEnabled)
-                   .selectAll('input')
-                   .property('checked', layerEnabled);
+           if (layer) {
+             return layer.enabled();
            }
 
-           function drawPhotoTypeItems(selection) {
-               var data = context.photos().allPhotoTypes();
-
-               function typeEnabled(d) {
-                   return context.photos().showsPhotoType(d);
-               }
-
-               var ul = selection
-                   .selectAll('.layer-list-photo-types')
-                   .data(context.photos().shouldFilterByPhotoType() ? [0] : []);
-
-               ul.exit()
-                   .remove();
+           return false;
+         }
 
-               ul = ul.enter()
-                   .append('ul')
-                   .attr('class', 'layer-list layer-list-photo-types')
-                   .merge(ul);
+         function setLayer(which, enabled) {
+           // Don't allow layer changes while drawing - #6584
+           var mode = context.mode();
+           if (mode && /^draw/.test(mode.id)) return;
+           var layer = layers.layer(which);
 
-               var li = ul.selectAll('.list-item-photo-types')
-                   .data(data);
+           if (layer) {
+             layer.enabled(enabled);
 
-               li.exit()
-                   .remove();
+             if (!enabled && (which === 'osm' || which === 'notes')) {
+               context.enter(modeBrowse(context));
+             }
+           }
+         }
 
-               var liEnter = li.enter()
-                   .append('li')
-                   .attr('class', function(d) {
-                       return 'list-item-photo-types list-item-' + d;
-                   });
+         function toggleLayer(which) {
+           setLayer(which, !showsLayer(which));
+         }
 
-               var labelEnter = liEnter
-                   .append('label')
-                   .each(function(d) {
-                       select(this)
-                           .call(uiTooltip()
-                               .title(_t('photo_overlays.photo_type.' + d + '.tooltip'))
-                               .placement('top')
-                           );
-                   });
+         function drawOsmItems(selection) {
+           var osmKeys = ['osm', 'notes'];
+           var osmLayers = layers.all().filter(function (obj) {
+             return osmKeys.indexOf(obj.id) !== -1;
+           });
+           var ul = selection.selectAll('.layer-list-osm').data([0]);
+           ul = ul.enter().append('ul').attr('class', 'layer-list layer-list-osm').merge(ul);
+           var li = ul.selectAll('.list-item').data(osmLayers);
+           li.exit().remove();
+           var liEnter = li.enter().append('li').attr('class', function (d) {
+             return 'list-item list-item-' + d.id;
+           });
+           var labelEnter = liEnter.append('label').each(function (d) {
+             if (d.id === 'osm') {
+               select(this).call(uiTooltip().title(_t.html('map_data.layers.' + d.id + '.tooltip')).keys([uiCmd('⌥' + _t('area_fill.wireframe.key'))]).placement('bottom'));
+             } else {
+               select(this).call(uiTooltip().title(_t.html('map_data.layers.' + d.id + '.tooltip')).placement('bottom'));
+             }
+           });
+           labelEnter.append('input').attr('type', 'checkbox').on('change', function (d3_event, d) {
+             toggleLayer(d.id);
+           });
+           labelEnter.append('span').html(function (d) {
+             return _t.html('map_data.layers.' + d.id + '.title');
+           }); // Update
+
+           li.merge(liEnter).classed('active', function (d) {
+             return d.layer.enabled();
+           }).selectAll('input').property('checked', function (d) {
+             return d.layer.enabled();
+           });
+         }
 
-               labelEnter
-                   .append('input')
-                   .attr('type', 'checkbox')
-                   .on('change', function(d) {
-                       context.photos().togglePhotoType(d);
-                   });
+         function drawQAItems(selection) {
+           var qaKeys = ['keepRight', 'improveOSM', 'osmose'];
+           var qaLayers = layers.all().filter(function (obj) {
+             return qaKeys.indexOf(obj.id) !== -1;
+           });
+           var ul = selection.selectAll('.layer-list-qa').data([0]);
+           ul = ul.enter().append('ul').attr('class', 'layer-list layer-list-qa').merge(ul);
+           var li = ul.selectAll('.list-item').data(qaLayers);
+           li.exit().remove();
+           var liEnter = li.enter().append('li').attr('class', function (d) {
+             return 'list-item list-item-' + d.id;
+           });
+           var labelEnter = liEnter.append('label').each(function (d) {
+             select(this).call(uiTooltip().title(_t.html('map_data.layers.' + d.id + '.tooltip')).placement('bottom'));
+           });
+           labelEnter.append('input').attr('type', 'checkbox').on('change', function (d3_event, d) {
+             toggleLayer(d.id);
+           });
+           labelEnter.append('span').html(function (d) {
+             return _t.html('map_data.layers.' + d.id + '.title');
+           }); // Update
+
+           li.merge(liEnter).classed('active', function (d) {
+             return d.layer.enabled();
+           }).selectAll('input').property('checked', function (d) {
+             return d.layer.enabled();
+           });
+         } // Beta feature - sample vector layers to support Detroit Mapping Challenge
+         // https://github.com/osmus/detroit-mapping-challenge
 
-               labelEnter
-                   .append('span')
-                   .text(function(d) {
-                       return _t('photo_overlays.photo_type.' + d + '.title');
-                   });
 
+         function drawVectorItems(selection) {
+           var dataLayer = layers.layer('data');
+           var vtData = [{
+             name: 'Detroit Neighborhoods/Parks',
+             src: 'neighborhoods-parks',
+             tooltip: 'Neighborhood boundaries and parks as compiled by City of Detroit in concert with community groups.',
+             template: 'https://{switch:a,b,c,d}.tiles.mapbox.com/v4/jonahadkins.cjksmur6x34562qp9iv1u3ksf-54hev,jonahadkins.cjksmqxdx33jj2wp90xd9x2md-4e5y2/{z}/{x}/{y}.vector.pbf?access_token=pk.eyJ1Ijoiam9uYWhhZGtpbnMiLCJhIjoiRlVVVkx3VSJ9.9sdVEK_B_VkEXPjssU5MqA'
+           }, {
+             name: 'Detroit Composite POIs',
+             src: 'composite-poi',
+             tooltip: 'Fire Inspections, Business Licenses, and other public location data collated from the City of Detroit.',
+             template: 'https://{switch:a,b,c,d}.tiles.mapbox.com/v4/jonahadkins.cjksmm6a02sli31myxhsr7zf3-2sw8h/{z}/{x}/{y}.vector.pbf?access_token=pk.eyJ1Ijoiam9uYWhhZGtpbnMiLCJhIjoiRlVVVkx3VSJ9.9sdVEK_B_VkEXPjssU5MqA'
+           }, {
+             name: 'Detroit All-The-Places POIs',
+             src: 'alltheplaces-poi',
+             tooltip: 'Public domain business location data created by web scrapers.',
+             template: 'https://{switch:a,b,c,d}.tiles.mapbox.com/v4/jonahadkins.cjksmswgk340g2vo06p1w9w0j-8fjjc/{z}/{x}/{y}.vector.pbf?access_token=pk.eyJ1Ijoiam9uYWhhZGtpbnMiLCJhIjoiRlVVVkx3VSJ9.9sdVEK_B_VkEXPjssU5MqA'
+           }]; // Only show this if the map is around Detroit..
+
+           var detroit = geoExtent([-83.5, 42.1], [-82.8, 42.5]);
+           var showVectorItems = context.map().zoom() > 9 && detroit.contains(context.map().center());
+           var container = selection.selectAll('.vectortile-container').data(showVectorItems ? [0] : []);
+           container.exit().remove();
+           var containerEnter = container.enter().append('div').attr('class', 'vectortile-container');
+           containerEnter.append('h4').attr('class', 'vectortile-header').html('Detroit Vector Tiles (Beta)');
+           containerEnter.append('ul').attr('class', 'layer-list layer-list-vectortile');
+           containerEnter.append('div').attr('class', 'vectortile-footer').append('a').attr('target', '_blank').call(svgIcon('#iD-icon-out-link', 'inline')).attr('href', 'https://github.com/osmus/detroit-mapping-challenge').append('span').html('About these layers');
+           container = container.merge(containerEnter);
+           var ul = container.selectAll('.layer-list-vectortile');
+           var li = ul.selectAll('.list-item').data(vtData);
+           li.exit().remove();
+           var liEnter = li.enter().append('li').attr('class', function (d) {
+             return 'list-item list-item-' + d.src;
+           });
+           var labelEnter = liEnter.append('label').each(function (d) {
+             select(this).call(uiTooltip().title(d.tooltip).placement('top'));
+           });
+           labelEnter.append('input').attr('type', 'radio').attr('name', 'vectortile').on('change', selectVTLayer);
+           labelEnter.append('span').html(function (d) {
+             return d.name;
+           }); // Update
 
-               // Update
-               li
-                   .merge(liEnter)
-                   .classed('active', typeEnabled)
-                   .selectAll('input')
-                   .property('checked', typeEnabled);
-           }
+           li.merge(liEnter).classed('active', isVTLayerSelected).selectAll('input').property('checked', isVTLayerSelected);
 
-           function toggleLayer(which) {
-               setLayer(which, !showsLayer(which));
+           function isVTLayerSelected(d) {
+             return dataLayer && dataLayer.template() === d.template;
            }
 
-           function showsLayer(which) {
-               var layer = layers.layer(which);
-               if (layer) {
-                   return layer.enabled();
-               }
-               return false;
-           }
+           function selectVTLayer(d3_event, d) {
+             corePreferences('settings-custom-data-url', d.template);
 
-           function setLayer(which, enabled) {
-               var layer = layers.layer(which);
-               if (layer) {
-                   layer.enabled(enabled);
-               }
+             if (dataLayer) {
+               dataLayer.template(d.template, d.src);
+               dataLayer.enabled(true);
+             }
            }
+         }
 
-           context.layers().on('change.uiSectionPhotoOverlays', section.reRender);
-           context.photos().on('change.uiSectionPhotoOverlays', section.reRender);
-
-           return section;
-       }
+         function drawCustomDataItems(selection) {
+           var dataLayer = layers.layer('data');
+           var hasData = dataLayer && dataLayer.hasData();
+           var showsData = hasData && dataLayer.enabled();
+           var ul = selection.selectAll('.layer-list-data').data(dataLayer ? [0] : []); // Exit
 
-       function uiPaneMapData(context) {
+           ul.exit().remove(); // Enter
 
-           var mapDataPane = uiPane('map-data', context)
-               .key(_t('map_data.key'))
-               .title(_t('map_data.title'))
-               .description(_t('map_data.description'))
-               .iconName('iD-icon-data')
-               .sections([
-                   uiSectionDataLayers(context),
-                   uiSectionPhotoOverlays(context),
-                   uiSectionMapStyleOptions(context),
-                   uiSectionMapFeatures(context)
-               ]);
+           var ulEnter = ul.enter().append('ul').attr('class', 'layer-list layer-list-data');
+           var liEnter = ulEnter.append('li').attr('class', 'list-item-data');
+           var labelEnter = liEnter.append('label').call(uiTooltip().title(_t.html('map_data.layers.custom.tooltip')).placement('top'));
+           labelEnter.append('input').attr('type', 'checkbox').on('change', function () {
+             toggleLayer('data');
+           });
+           labelEnter.append('span').html(_t.html('map_data.layers.custom.title'));
+           liEnter.append('button').attr('class', 'open-data-options').call(uiTooltip().title(_t.html('settings.custom_data.tooltip')).placement(_mainLocalizer.textDirection() === 'rtl' ? 'right' : 'left')).on('click', editCustom).call(svgIcon('#iD-icon-more'));
+           liEnter.append('button').attr('class', 'zoom-to-data').call(uiTooltip().title(_t.html('map_data.layers.custom.zoom')).placement(_mainLocalizer.textDirection() === 'rtl' ? 'right' : 'left')).on('click', function (d3_event) {
+             if (select(this).classed('disabled')) return;
+             d3_event.preventDefault();
+             d3_event.stopPropagation();
+             dataLayer.fitZoom();
+           }).call(svgIcon('#iD-icon-framed-dot', 'monochrome')); // Update
 
-           return mapDataPane;
-       }
+           ul = ul.merge(ulEnter);
+           ul.selectAll('.list-item-data').classed('active', showsData).selectAll('label').classed('deemphasize', !hasData).selectAll('input').property('disabled', !hasData).property('checked', showsData);
+           ul.selectAll('button.zoom-to-data').classed('disabled', !hasData);
+         }
 
-       function uiSectionPrivacy(context) {
+         function editCustom(d3_event) {
+           d3_event.preventDefault();
+           context.container().call(settingsCustomData);
+         }
 
-           let section = uiSection('preferences-third-party', context)
-             .title(_t('preferences.privacy.title'))
-             .disclosureContent(renderDisclosureContent);
+         function customChanged(d) {
+           var dataLayer = layers.layer('data');
 
-           let _showThirdPartyIcons = corePreferences('preferences.privacy.thirdpartyicons') || 'true';
+           if (d && d.url) {
+             dataLayer.url(d.url);
+           } else if (d && d.fileList) {
+             dataLayer.fileList(d.fileList);
+           }
+         }
 
-           function renderDisclosureContent(selection) {
-             // enter
-             let privacyOptionsListEnter = selection.selectAll('.privacy-options-list')
-               .data([0])
-               .enter()
-               .append('ul')
-               .attr('class', 'layer-list privacy-options-list');
-
-             let thirdPartyIconsEnter = privacyOptionsListEnter
-               .append('li')
-               .attr('class', 'privacy-third-party-icons-item')
-               .append('label')
-               .call(uiTooltip()
-                 .title(_t('preferences.privacy.third_party_icons.tooltip'))
-                 .placement('bottom')
-               );
+         function drawPanelItems(selection) {
+           var panelsListEnter = selection.selectAll('.md-extras-list').data([0]).enter().append('ul').attr('class', 'layer-list md-extras-list');
+           var historyPanelLabelEnter = panelsListEnter.append('li').attr('class', 'history-panel-toggle-item').append('label').call(uiTooltip().title(_t.html('map_data.history_panel.tooltip')).keys([uiCmd('⌘⇧' + _t('info_panels.history.key'))]).placement('top'));
+           historyPanelLabelEnter.append('input').attr('type', 'checkbox').on('change', function (d3_event) {
+             d3_event.preventDefault();
+             context.ui().info.toggle('history');
+           });
+           historyPanelLabelEnter.append('span').html(_t.html('map_data.history_panel.title'));
+           var measurementPanelLabelEnter = panelsListEnter.append('li').attr('class', 'measurement-panel-toggle-item').append('label').call(uiTooltip().title(_t.html('map_data.measurement_panel.tooltip')).keys([uiCmd('⌘⇧' + _t('info_panels.measurement.key'))]).placement('top'));
+           measurementPanelLabelEnter.append('input').attr('type', 'checkbox').on('change', function (d3_event) {
+             d3_event.preventDefault();
+             context.ui().info.toggle('measurement');
+           });
+           measurementPanelLabelEnter.append('span').html(_t.html('map_data.measurement_panel.title'));
+         }
 
-             thirdPartyIconsEnter
-               .append('input')
-               .attr('type', 'checkbox')
-               .on('change', () => {
-                 event.preventDefault();
-                 _showThirdPartyIcons = (_showThirdPartyIcons === 'true') ? 'false' : 'true';
-                 corePreferences('preferences.privacy.thirdpartyicons', _showThirdPartyIcons);
-                 update();
-               });
+         context.layers().on('change.uiSectionDataLayers', section.reRender);
+         context.map().on('move.uiSectionDataLayers', debounce(function () {
+           // Detroit layers may have moved in or out of view
+           window.requestIdleCallback(section.reRender);
+         }, 1000));
+         return section;
+       }
 
-             thirdPartyIconsEnter
-               .append('span')
-               .text(_t('preferences.privacy.third_party_icons.description'));
+       function uiSectionMapFeatures(context) {
+         var _features = context.features().keys();
+
+         var section = uiSection('map-features', context).label(_t.html('map_data.map_features')).disclosureContent(renderDisclosureContent).expandedByDefault(false);
+
+         function renderDisclosureContent(selection) {
+           var container = selection.selectAll('.layer-feature-list-container').data([0]);
+           var containerEnter = container.enter().append('div').attr('class', 'layer-feature-list-container');
+           containerEnter.append('ul').attr('class', 'layer-list layer-feature-list');
+           var footer = containerEnter.append('div').attr('class', 'feature-list-links section-footer');
+           footer.append('a').attr('class', 'feature-list-link').attr('href', '#').html(_t.html('issues.disable_all')).on('click', function (d3_event) {
+             d3_event.preventDefault();
+             context.features().disableAll();
+           });
+           footer.append('a').attr('class', 'feature-list-link').attr('href', '#').html(_t.html('issues.enable_all')).on('click', function (d3_event) {
+             d3_event.preventDefault();
+             context.features().enableAll();
+           }); // Update
 
+           container = container.merge(containerEnter);
+           container.selectAll('.layer-feature-list').call(drawListItems, _features, 'checkbox', 'feature', clickFeature, showsFeature);
+         }
 
-             // Privacy Policy link
-             selection.selectAll('.privacy-link')
-               .data([0])
-               .enter()
-               .append('div')
-               .attr('class', 'privacy-link')
-               .append('a')
-               .attr('target', '_blank')
-               .call(svgIcon('#iD-icon-out-link', 'inline'))
-               .attr('href', 'https://github.com/openstreetmap/iD/blob/release/PRIVACY.md')
-               .append('span')
-               .text(_t('preferences.privacy.privacy_link'));
+         function drawListItems(selection, data, type, name, change, active) {
+           var items = selection.selectAll('li').data(data); // Exit
 
-             update();
+           items.exit().remove(); // Enter
 
+           var enter = items.enter().append('li').call(uiTooltip().title(function (d) {
+             var tip = _t.html(name + '.' + d + '.tooltip');
 
-             function update() {
-               selection.selectAll('.privacy-third-party-icons-item')
-                 .classed('active', (_showThirdPartyIcons === 'true'))
-                 .select('input')
-                 .property('checked', (_showThirdPartyIcons === 'true'));
+             if (autoHiddenFeature(d)) {
+               var msg = showsLayer('osm') ? _t.html('map_data.autohidden') : _t.html('map_data.osmhidden');
+               tip += '<div>' + msg + '</div>';
              }
-           }
-
-           return section;
-       }
-
-       function uiPanePreferences(context) {
-
-         let preferencesPane = uiPane('preferences', context)
-           .key(_t('preferences.key'))
-           .title(_t('preferences.title'))
-           .description(_t('preferences.description'))
-           .iconName('fas-user-cog')
-           .sections([
-               uiSectionPrivacy(context)
-           ]);
-
-         return preferencesPane;
-       }
 
-       function uiInit(context) {
-           var _initCounter = 0;
-           var _needWidth = {};
+             return tip;
+           }).placement('top'));
+           var label = enter.append('label');
+           label.append('input').attr('type', type).attr('name', name).on('change', change);
+           label.append('span').html(function (d) {
+             return _t.html(name + '.' + d + '.description');
+           }); // Update
 
-           var _lastPointerType;
+           items = items.merge(enter);
+           items.classed('active', active).selectAll('input').property('checked', active).property('indeterminate', autoHiddenFeature);
+         }
 
+         function autoHiddenFeature(d) {
+           return context.features().autoHidden(d);
+         }
 
-           function render(container) {
+         function showsFeature(d) {
+           return context.features().enabled(d);
+         }
 
-               container
-                   .on('click.ui', function() {
-                       // we're only concerned with the primary mouse button
-                       if (event.button !== 0) return;
+         function clickFeature(d3_event, d) {
+           context.features().toggle(d);
+         }
 
-                       if (!event.composedPath) return;
+         function showsLayer(id) {
+           var layer = context.layers().layer(id);
+           return layer && layer.enabled();
+         } // add listeners
 
-                       // some targets have default click events we don't want to override
-                       var isOkayTarget = event.composedPath().some(function(node) {
-                           // clicking <label> affects its <input> by default
-                           return node.nodeName === 'LABEL' ||
-                               // clicking <a> opens a hyperlink by default
-                               node.nodeName === 'A';
-                       });
-                       if (isOkayTarget) return;
 
-                       // disable double-tap-to-zoom on touchscreens
-                       event.preventDefault();
-                   });
+         context.features().on('change.map_features', section.reRender);
+         return section;
+       }
 
-               var detected = utilDetect();
+       function uiSectionMapStyleOptions(context) {
+         var section = uiSection('fill-area', context).label(_t.html('map_data.style_options')).disclosureContent(renderDisclosureContent).expandedByDefault(false);
+
+         function renderDisclosureContent(selection) {
+           var container = selection.selectAll('.layer-fill-list').data([0]);
+           container.enter().append('ul').attr('class', 'layer-list layer-fill-list').merge(container).call(drawListItems, context.map().areaFillOptions, 'radio', 'area_fill', setFill, isActiveFill);
+           var container2 = selection.selectAll('.layer-visual-diff-list').data([0]);
+           container2.enter().append('ul').attr('class', 'layer-list layer-visual-diff-list').merge(container2).call(drawListItems, ['highlight_edits'], 'checkbox', 'visual_diff', toggleHighlightEdited, function () {
+             return context.surface().classed('highlight-edited');
+           });
+         }
 
-               // only WebKit supports gesture events
-               if ('GestureEvent' in window &&
-                   // Listening for gesture events on iOS 13.4+ breaks double-tapping,
-                   // but we only need to do this on desktop Safari anyway. – #7694
-                   !detected.isMobileWebKit) {
+         function drawListItems(selection, data, type, name, change, active) {
+           var items = selection.selectAll('li').data(data); // Exit
 
-                   // On iOS we disable pinch-to-zoom of the UI via the `touch-action`
-                   // CSS property, but on desktop Safari we need to manually cancel the
-                   // default gesture events.
-                   container.on('gesturestart.ui gesturechange.ui gestureend.ui', function() {
-                       // disable pinch-to-zoom of the UI via multitouch trackpads on macOS Safari
-                       event.preventDefault();
-                   });
-               }
+           items.exit().remove(); // Enter
 
-               if ('PointerEvent' in window) {
-                   select(window)
-                       .on('pointerdown.ui pointerup.ui', function() {
-                           var pointerType = event.pointerType || 'mouse';
-                           if (_lastPointerType !== pointerType) {
-                               _lastPointerType = pointerType;
-                               container
-                                   .attr('pointer', pointerType);
-                           }
-                       }, true);
-               } else {
-                   _lastPointerType = 'mouse';
-                   container
-                       .attr('pointer', 'mouse');
-               }
+           var enter = items.enter().append('li').call(uiTooltip().title(function (d) {
+             return _t.html(name + '.' + d + '.tooltip');
+           }).keys(function (d) {
+             var key = d === 'wireframe' ? _t('area_fill.wireframe.key') : null;
+             if (d === 'highlight_edits') key = _t('map_data.highlight_edits.key');
+             return key ? [key] : null;
+           }).placement('top'));
+           var label = enter.append('label');
+           label.append('input').attr('type', type).attr('name', name).on('change', change);
+           label.append('span').html(function (d) {
+             return _t.html(name + '.' + d + '.description');
+           }); // Update
 
-               container
-                   .attr('dir', _mainLocalizer.textDirection());
+           items = items.merge(enter);
+           items.classed('active', active).selectAll('input').property('checked', active).property('indeterminate', false);
+         }
 
-               // setup fullscreen keybindings (no button shown at this time)
-               container
-                   .call(uiFullScreen(context));
+         function isActiveFill(d) {
+           return context.map().activeAreaFill() === d;
+         }
 
-               var map = context.map();
-               map.redrawEnable(false);  // don't draw until we've set zoom/lat/long
+         function toggleHighlightEdited(d3_event) {
+           d3_event.preventDefault();
+           context.map().toggleHighlightEdited();
+         }
 
-               map
-                   .on('hitMinZoom.ui', function() {
-                       ui.flash.text(_t('cannot_zoom'))();
-                   });
+         function setFill(d3_event, d) {
+           context.map().activeAreaFill(d);
+         }
 
-               container
-                   .append('svg')
-                   .attr('id', 'ideditor-defs')
-                   .call(svgDefs(context));
+         context.map().on('changeHighlighting.ui_style, changeAreaFill.ui_style', section.reRender);
+         return section;
+       }
 
-               container
-                   .append('div')
-                   .attr('class', 'sidebar')
-                   .call(ui.sidebar);
+       function uiSectionPhotoOverlays(context) {
+         var layers = context.layers();
+         var section = uiSection('photo-overlays', context).label(_t.html('photo_overlays.title')).disclosureContent(renderDisclosureContent).expandedByDefault(false);
 
-               var content = container
-                   .append('div')
-                   .attr('class', 'main-content active');
+         function renderDisclosureContent(selection) {
+           var container = selection.selectAll('.photo-overlay-container').data([0]);
+           container.enter().append('div').attr('class', 'photo-overlay-container').merge(container).call(drawPhotoItems).call(drawPhotoTypeItems).call(drawDateFilter).call(drawUsernameFilter);
+         }
 
-               // Top toolbar
-               content
-                   .append('div')
-                   .attr('class', 'top-toolbar-wrap')
-                   .append('div')
-                   .attr('class', 'top-toolbar fillD')
-                   .call(uiTopToolbar(context));
+         function drawPhotoItems(selection) {
+           var photoKeys = context.photos().overlayLayerIDs();
+           var photoLayers = layers.all().filter(function (obj) {
+             return photoKeys.indexOf(obj.id) !== -1;
+           });
+           var data = photoLayers.filter(function (obj) {
+             return obj.layer.supported();
+           });
 
-               content
-                   .append('div')
-                   .attr('class', 'main-map')
-                   .attr('dir', 'ltr')
-                   .call(map);
+           function layerSupported(d) {
+             return d.layer && d.layer.supported();
+           }
 
-               content
-                   .append('div')
-                   .attr('class', 'spinner')
-                   .call(uiSpinner(context));
+           function layerEnabled(d) {
+             return layerSupported(d) && d.layer.enabled();
+           }
 
-               // Add attribution and footer
-               var about = content
-                   .append('div')
-                   .attr('class', 'map-footer');
+           var ul = selection.selectAll('.layer-list-photos').data([0]);
+           ul = ul.enter().append('ul').attr('class', 'layer-list layer-list-photos').merge(ul);
+           var li = ul.selectAll('.list-item-photos').data(data);
+           li.exit().remove();
+           var liEnter = li.enter().append('li').attr('class', function (d) {
+             var classes = 'list-item-photos list-item-' + d.id;
 
-               about
-                   .append('div')
-                   .attr('class', 'attribution-wrap')
-                   .attr('dir', 'ltr')
-                   .call(uiAttribution(context));
+             if (d.id === 'mapillary-signs' || d.id === 'mapillary-map-features') {
+               classes += ' indented';
+             }
 
-               about
-                   .append('div')
-                   .attr('class', 'api-status')
-                   .call(uiStatus(context));
+             return classes;
+           });
+           var labelEnter = liEnter.append('label').each(function (d) {
+             var titleID;
+             if (d.id === 'mapillary-signs') titleID = 'mapillary.signs.tooltip';else if (d.id === 'mapillary') titleID = 'mapillary_images.tooltip';else if (d.id === 'openstreetcam') titleID = 'openstreetcam_images.tooltip';else titleID = d.id.replace(/-/g, '_') + '.tooltip';
+             select(this).call(uiTooltip().title(_t.html(titleID)).placement('top'));
+           });
+           labelEnter.append('input').attr('type', 'checkbox').on('change', function (d3_event, d) {
+             toggleLayer(d.id);
+           });
+           labelEnter.append('span').html(function (d) {
+             var id = d.id;
+             if (id === 'mapillary-signs') id = 'photo_overlays.traffic_signs';
+             return _t.html(id.replace(/-/g, '_') + '.title');
+           }); // Update
 
+           li.merge(liEnter).classed('active', layerEnabled).selectAll('input').property('checked', layerEnabled);
+         }
 
-               var footer = about
-                   .append('div')
-                   .attr('class', 'map-footer-bar fillD');
+         function drawPhotoTypeItems(selection) {
+           var data = context.photos().allPhotoTypes();
 
-               footer
-                   .append('div')
-                   .attr('class', 'flash-wrap footer-hide');
+           function typeEnabled(d) {
+             return context.photos().showsPhotoType(d);
+           }
 
-               var footerWrap = footer
-                   .append('div')
-                   .attr('class', 'main-footer-wrap footer-show');
+           var ul = selection.selectAll('.layer-list-photo-types').data([0]);
+           ul.exit().remove();
+           ul = ul.enter().append('ul').attr('class', 'layer-list layer-list-photo-types').merge(ul);
+           var li = ul.selectAll('.list-item-photo-types').data(context.photos().shouldFilterByPhotoType() ? data : []);
+           li.exit().remove();
+           var liEnter = li.enter().append('li').attr('class', function (d) {
+             return 'list-item-photo-types list-item-' + d;
+           });
+           var labelEnter = liEnter.append('label').each(function (d) {
+             select(this).call(uiTooltip().title(_t.html('photo_overlays.photo_type.' + d + '.tooltip')).placement('top'));
+           });
+           labelEnter.append('input').attr('type', 'checkbox').on('change', function (d3_event, d) {
+             context.photos().togglePhotoType(d);
+           });
+           labelEnter.append('span').html(function (d) {
+             return _t.html('photo_overlays.photo_type.' + d + '.title');
+           }); // Update
 
-               footerWrap
-                   .append('div')
-                   .attr('class', 'scale-block')
-                   .call(uiScale(context));
+           li.merge(liEnter).classed('active', typeEnabled).selectAll('input').property('checked', typeEnabled);
+         }
 
-               var aboutList = footerWrap
-                   .append('div')
-                   .attr('class', 'info-block')
-                   .append('ul')
-                   .attr('class', 'map-footer-list');
-
-               if (!context.embed()) {
-                   aboutList
-                       .call(uiAccount(context));
-               }
-
-               aboutList
-                   .append('li')
-                   .attr('class', 'version')
-                   .call(uiVersion(context));
-
-               var issueLinks = aboutList
-                   .append('li');
-
-               issueLinks
-                   .append('a')
-                   .attr('target', '_blank')
-                   .attr('href', 'https://github.com/openstreetmap/iD/issues')
-                   .call(svgIcon('#iD-icon-bug', 'light'))
-                   .call(uiTooltip().title(_t('report_a_bug')).placement('top'));
-
-               issueLinks
-                   .append('a')
-                   .attr('target', '_blank')
-                   .attr('href', 'https://github.com/openstreetmap/iD/blob/develop/CONTRIBUTING.md#translating')
-                   .call(svgIcon('#iD-icon-translate', 'light'))
-                   .call(uiTooltip().title(_t('help_translate')).placement('top'));
-
-               aboutList
-                   .append('li')
-                   .attr('class', 'feature-warning')
-                   .attr('tabindex', -1)
-                   .call(uiFeatureInfo(context));
-
-               aboutList
-                   .append('li')
-                   .attr('class', 'issues-info')
-                   .attr('tabindex', -1)
-                   .call(uiIssuesInfo(context));
-
-               var apiConnections = context.apiConnections();
-               if (apiConnections && apiConnections.length > 1) {
-                   aboutList
-                       .append('li')
-                       .attr('class', 'source-switch')
-                       .attr('tabindex', -1)
-                       .call(uiSourceSwitch(context)
-                           .keys(apiConnections)
-                       );
-               }
+         function drawDateFilter(selection) {
+           var data = context.photos().dateFilters();
 
-               aboutList
-                   .append('li')
-                   .attr('class', 'user-list')
-                   .attr('tabindex', -1)
-                   .call(uiContributors(context));
+           function filterEnabled(d) {
+             return context.photos().dateFilterValue(d);
+           }
 
+           var ul = selection.selectAll('.layer-list-date-filter').data([0]);
+           ul.exit().remove();
+           ul = ul.enter().append('ul').attr('class', 'layer-list layer-list-date-filter').merge(ul);
+           var li = ul.selectAll('.list-item-date-filter').data(context.photos().shouldFilterByDate() ? data : []);
+           li.exit().remove();
+           var liEnter = li.enter().append('li').attr('class', 'list-item-date-filter');
+           var labelEnter = liEnter.append('label').each(function (d) {
+             select(this).call(uiTooltip().title(_t.html('photo_overlays.date_filter.' + d + '.tooltip')).placement('top'));
+           });
+           labelEnter.append('span').html(function (d) {
+             return _t.html('photo_overlays.date_filter.' + d + '.title');
+           });
+           labelEnter.append('input').attr('type', 'date').attr('class', 'list-item-input').attr('placeholder', _t('units.year_month_day')).call(utilNoAuto).each(function (d) {
+             utilGetSetValue(select(this), context.photos().dateFilterValue(d) || '');
+           }).on('change', function (d3_event, d) {
+             var value = utilGetSetValue(select(this)).trim();
+             context.photos().setDateFilter(d, value, true); // reload the displayed dates
+
+             li.selectAll('input').each(function (d) {
+               utilGetSetValue(select(this), context.photos().dateFilterValue(d) || '');
+             });
+           });
+           li = li.merge(liEnter).classed('active', filterEnabled);
+         }
 
-               // Setup map dimensions and move map to initial center/zoom.
-               // This should happen after .main-content and toolbars exist.
-               ui.onResize();
-               map.redrawEnable(true);
+         function drawUsernameFilter(selection) {
+           function filterEnabled() {
+             return context.photos().usernames();
+           }
 
-               ui.hash = behaviorHash(context);
-               ui.hash();
-               if (!ui.hash.hadHash) {
-                   map.centerZoom([0, 0], 2);
-               }
+           var ul = selection.selectAll('.layer-list-username-filter').data([0]);
+           ul.exit().remove();
+           ul = ul.enter().append('ul').attr('class', 'layer-list layer-list-username-filter').merge(ul);
+           var li = ul.selectAll('.list-item-username-filter').data(context.photos().shouldFilterByUsername() ? ['username-filter'] : []);
+           li.exit().remove();
+           var liEnter = li.enter().append('li').attr('class', 'list-item-username-filter');
+           var labelEnter = liEnter.append('label').each(function () {
+             select(this).call(uiTooltip().title(_t.html('photo_overlays.username_filter.tooltip')).placement('top'));
+           });
+           labelEnter.append('span').html(_t.html('photo_overlays.username_filter.title'));
+           labelEnter.append('input').attr('type', 'text').attr('class', 'list-item-input').call(utilNoAuto).property('value', usernameValue).on('change', function () {
+             var value = select(this).property('value');
+             context.photos().setUsernameFilter(value, true);
+             select(this).property('value', usernameValue);
+           });
+           li.merge(liEnter).classed('active', filterEnabled);
 
+           function usernameValue() {
+             var usernames = context.photos().usernames();
+             if (usernames) return usernames.join('; ');
+             return usernames;
+           }
+         }
 
-               var overMap = content
-                   .append('div')
-                   .attr('class', 'over-map');
+         function toggleLayer(which) {
+           setLayer(which, !showsLayer(which));
+         }
 
-               // Map controls
-               var controls = overMap
-                   .append('div')
-                   .attr('class', 'map-controls');
+         function showsLayer(which) {
+           var layer = layers.layer(which);
 
-               controls
-                   .append('div')
-                   .attr('class', 'map-control zoombuttons')
-                   .call(uiZoom(context));
+           if (layer) {
+             return layer.enabled();
+           }
 
-               controls
-                   .append('div')
-                   .attr('class', 'map-control zoom-to-selection-control')
-                   .call(uiZoomToSelection(context));
+           return false;
+         }
 
-               controls
-                   .append('div')
-                   .attr('class', 'map-control geolocate-control')
-                   .call(uiGeolocate(context));
+         function setLayer(which, enabled) {
+           var layer = layers.layer(which);
 
-               // Add panes
-               // This should happen after map is initialized, as some require surface()
-               var panes = overMap
-                   .append('div')
-                   .attr('class', 'map-panes');
-
-               var uiPanes = [
-                   uiPaneBackground(context),
-                   uiPaneMapData(context),
-                   uiPaneIssues(context),
-                   uiPanePreferences(context),
-                   uiPaneHelp(context)
-               ];
+           if (layer) {
+             layer.enabled(enabled);
+           }
+         }
 
-               uiPanes.forEach(function(pane) {
-                   controls
-                       .append('div')
-                       .attr('class', 'map-control map-pane-control ' + pane.id + '-control')
-                       .call(pane.renderToggleButton);
+         context.layers().on('change.uiSectionPhotoOverlays', section.reRender);
+         context.photos().on('change.uiSectionPhotoOverlays', section.reRender);
+         return section;
+       }
 
-                   panes
-                       .call(pane.renderPane);
-               });
+       function uiPaneMapData(context) {
+         var mapDataPane = uiPane('map-data', context).key(_t('map_data.key')).label(_t.html('map_data.title')).description(_t.html('map_data.description')).iconName('iD-icon-data').sections([uiSectionDataLayers(context), uiSectionPhotoOverlays(context), uiSectionMapStyleOptions(context), uiSectionMapFeatures(context)]);
+         return mapDataPane;
+       }
 
-               ui.info = uiInfo(context);
+       function uiSectionPrivacy(context) {
+         var section = uiSection('preferences-third-party', context).label(_t.html('preferences.privacy.title')).disclosureContent(renderDisclosureContent);
 
-               // Add absolutely-positioned elements that sit on top of the map
-               // This should happen after the map is ready (center/zoom)
-               overMap
-                   .call(uiMapInMap(context))
-                   .call(ui.info)
-                   .call(uiNotice(context));
+         var _showThirdPartyIcons = corePreferences('preferences.privacy.thirdpartyicons') || 'true';
 
+         function renderDisclosureContent(selection) {
+           // enter
+           var privacyOptionsListEnter = selection.selectAll('.privacy-options-list').data([0]).enter().append('ul').attr('class', 'layer-list privacy-options-list');
+           var thirdPartyIconsEnter = privacyOptionsListEnter.append('li').attr('class', 'privacy-third-party-icons-item').append('label').call(uiTooltip().title(_t.html('preferences.privacy.third_party_icons.tooltip')).placement('bottom'));
+           thirdPartyIconsEnter.append('input').attr('type', 'checkbox').on('change', function (d3_event) {
+             d3_event.preventDefault();
+             _showThirdPartyIcons = _showThirdPartyIcons === 'true' ? 'false' : 'true';
+             corePreferences('preferences.privacy.thirdpartyicons', _showThirdPartyIcons);
+             update();
+           });
+           thirdPartyIconsEnter.append('span').html(_t.html('preferences.privacy.third_party_icons.description')); // Privacy Policy link
 
-               overMap
-                   .append('div')
-                   .attr('class', 'photoviewer')
-                   .classed('al', true)       // 'al'=left,  'ar'=right
-                   .classed('hide', true)
-                   .call(ui.photoviewer);
+           selection.selectAll('.privacy-link').data([0]).enter().append('div').attr('class', 'privacy-link').append('a').attr('target', '_blank').call(svgIcon('#iD-icon-out-link', 'inline')).attr('href', 'https://github.com/openstreetmap/iD/blob/release/PRIVACY.md').append('span').html(_t.html('preferences.privacy.privacy_link'));
+           update();
 
+           function update() {
+             selection.selectAll('.privacy-third-party-icons-item').classed('active', _showThirdPartyIcons === 'true').select('input').property('checked', _showThirdPartyIcons === 'true');
+           }
+         }
 
-               // Bind events
-               window.onbeforeunload = function() {
-                   return context.save();
-               };
-               window.onunload = function() {
-                   context.history().unlock();
-               };
+         return section;
+       }
 
-               select(window)
-                   .on('resize.editor', ui.onResize);
-
-
-               var panPixels = 80;
-               context.keybinding()
-                   .on('⌫', function() { event.preventDefault(); })
-                   .on([_t('sidebar.key'), '`', '²', '@'], ui.sidebar.toggle)   // #5663, #6864 - common QWERTY, AZERTY
-                   .on('←', pan([panPixels, 0]))
-                   .on('↑', pan([0, panPixels]))
-                   .on('→', pan([-panPixels, 0]))
-                   .on('↓', pan([0, -panPixels]))
-                   .on(uiCmd('⌘←'), pan([map.dimensions()[0], 0]))
-                   .on(uiCmd('⌘↑'), pan([0, map.dimensions()[1]]))
-                   .on(uiCmd('⌘→'), pan([-map.dimensions()[0], 0]))
-                   .on(uiCmd('⌘↓'), pan([0, -map.dimensions()[1]]))
-                   .on(uiCmd('⌘' + _t('background.key')), function quickSwitch() {
-                       if (event) {
-                           event.stopImmediatePropagation();
-                           event.preventDefault();
-                       }
-                       var previousBackground = context.background().findSource(corePreferences('background-last-used-toggle'));
-                       if (previousBackground) {
-                           var currentBackground = context.background().baseLayerSource();
-                           corePreferences('background-last-used-toggle', currentBackground.id);
-                           corePreferences('background-last-used', previousBackground.id);
-                           context.background().baseLayerSource(previousBackground);
-                       }
-                   })
-                   .on(_t('area_fill.wireframe.key'), function toggleWireframe() {
-                       event.preventDefault();
-                       event.stopPropagation();
-                       context.map().toggleWireframe();
-                   })
-                   .on(uiCmd('⌥' + _t('area_fill.wireframe.key')), function toggleOsmData() {
-                       event.preventDefault();
-                       event.stopPropagation();
-
-                       // Don't allow layer changes while drawing - #6584
-                       var mode = context.mode();
-                       if (mode && /^draw/.test(mode.id)) return;
-
-                       var layer = context.layers().layer('osm');
-                       if (layer) {
-                           layer.enabled(!layer.enabled());
-                           if (!layer.enabled()) {
-                               context.enter(modeBrowse(context));
-                           }
-                       }
-                   })
-                   .on(_t('map_data.highlight_edits.key'), function toggleHighlightEdited() {
-                       event.preventDefault();
-                       context.map().toggleHighlightEdited();
-                   });
+       function uiPanePreferences(context) {
+         var preferencesPane = uiPane('preferences', context).key(_t('preferences.key')).label(_t.html('preferences.title')).description(_t.html('preferences.description')).iconName('fas-user-cog').sections([uiSectionPrivacy(context)]);
+         return preferencesPane;
+       }
 
-               context
-                   .on('enter.editor', function(entered) {
-                       container
-                           .classed('mode-' + entered.id, true);
-                   })
-                   .on('exit.editor', function(exited) {
-                       container
-                           .classed('mode-' + exited.id, false);
-                   });
+       function uiInit(context) {
+         var _initCounter = 0;
+         var _needWidth = {};
+
+         var _lastPointerType;
+
+         function render(container) {
+           container.on('click.ui', function (d3_event) {
+             // we're only concerned with the primary mouse button
+             if (d3_event.button !== 0) return;
+             if (!d3_event.composedPath) return; // some targets have default click events we don't want to override
+
+             var isOkayTarget = d3_event.composedPath().some(function (node) {
+               // we only care about element nodes
+               return node.nodeType === 1 && ( // clicking <input> focuses it and/or changes a value
+               node.nodeName === 'INPUT' || // clicking <label> affects its <input> by default
+               node.nodeName === 'LABEL' || // clicking <a> opens a hyperlink by default
+               node.nodeName === 'A');
+             });
+             if (isOkayTarget) return; // disable double-tap-to-zoom on touchscreens
 
-               context.enter(modeBrowse(context));
+             d3_event.preventDefault();
+           });
+           var detected = utilDetect(); // only WebKit supports gesture events
+
+           if ('GestureEvent' in window && // Listening for gesture events on iOS 13.4+ breaks double-tapping,
+           // but we only need to do this on desktop Safari anyway. – #7694
+           !detected.isMobileWebKit) {
+             // On iOS we disable pinch-to-zoom of the UI via the `touch-action`
+             // CSS property, but on desktop Safari we need to manually cancel the
+             // default gesture events.
+             container.on('gesturestart.ui gesturechange.ui gestureend.ui', function (d3_event) {
+               // disable pinch-to-zoom of the UI via multitouch trackpads on macOS Safari
+               d3_event.preventDefault();
+             });
+           }
 
-               if (!_initCounter++) {
-                   if (!ui.hash.startWalkthrough) {
-                       context.container()
-                           .call(uiSplash(context))
-                           .call(uiRestore(context));
-                   }
+           if ('PointerEvent' in window) {
+             select(window).on('pointerdown.ui pointerup.ui', function (d3_event) {
+               var pointerType = d3_event.pointerType || 'mouse';
 
-                   context.container()
-                       .call(uiShortcuts(context));
+               if (_lastPointerType !== pointerType) {
+                 _lastPointerType = pointerType;
+                 container.attr('pointer', pointerType);
                }
+             }, true);
+           } else {
+             _lastPointerType = 'mouse';
+             container.attr('pointer', 'mouse');
+           }
 
-               var osm = context.connection();
-               var auth = uiLoading(context).message(_t('loading_auth')).blocking(true);
+           container.attr('lang', _mainLocalizer.localeCode()).attr('dir', _mainLocalizer.textDirection()); // setup fullscreen keybindings (no button shown at this time)
 
-               if (osm && auth) {
-                   osm
-                       .on('authLoading.ui', function() {
-                           context.container()
-                               .call(auth);
-                       })
-                       .on('authDone.ui', function() {
-                           auth.close();
-                       });
-               }
+           container.call(uiFullScreen(context));
+           var map = context.map();
+           map.redrawEnable(false); // don't draw until we've set zoom/lat/long
 
-               _initCounter++;
+           map.on('hitMinZoom.ui', function () {
+             ui.flash.iconName('#iD-icon-no').label(_t.html('cannot_zoom'))();
+           });
+           container.append('svg').attr('id', 'ideditor-defs').call(ui.svgDefs);
+           container.append('div').attr('class', 'sidebar').call(ui.sidebar);
+           var content = container.append('div').attr('class', 'main-content active'); // Top toolbar
+
+           content.append('div').attr('class', 'top-toolbar-wrap').append('div').attr('class', 'top-toolbar fillD').call(uiTopToolbar(context));
+           content.append('div').attr('class', 'main-map').attr('dir', 'ltr').call(map);
+           var overMap = content.append('div').attr('class', 'over-map'); // HACK: Mobile Safari 14 likes to select anything selectable when long-
+           // pressing, even if it's not targeted. This conflicts with long-pressing
+           // to show the edit menu. We add a selectable offscreen element as the first
+           // child to trick Safari into not showing the selection UI.
+
+           overMap.append('div').attr('class', 'select-trap').text('t');
+           overMap.call(uiMapInMap(context)).call(uiNotice(context));
+           overMap.append('div').attr('class', 'spinner').call(uiSpinner(context)); // Map controls
+
+           var controls = overMap.append('div').attr('class', 'map-controls');
+           controls.append('div').attr('class', 'map-control zoombuttons').call(uiZoom(context));
+           controls.append('div').attr('class', 'map-control zoom-to-selection-control').call(uiZoomToSelection(context));
+           controls.append('div').attr('class', 'map-control geolocate-control').call(uiGeolocate(context)); // Add panes
+           // This should happen after map is initialized, as some require surface()
+
+           var panes = overMap.append('div').attr('class', 'map-panes');
+           var uiPanes = [uiPaneBackground(context), uiPaneMapData(context), uiPaneIssues(context), uiPanePreferences(context), uiPaneHelp(context)];
+           uiPanes.forEach(function (pane) {
+             controls.append('div').attr('class', 'map-control map-pane-control ' + pane.id + '-control').call(pane.renderToggleButton);
+             panes.call(pane.renderPane);
+           });
+           ui.info = uiInfo(context);
+           overMap.call(ui.info);
+           overMap.append('div').attr('class', 'photoviewer').classed('al', true) // 'al'=left,  'ar'=right
+           .classed('hide', true).call(ui.photoviewer);
+           overMap.append('div').attr('class', 'attribution-wrap').attr('dir', 'ltr').call(uiAttribution(context)); // Add footer
 
-               if (ui.hash.startWalkthrough) {
-                   ui.hash.startWalkthrough = false;
-                   context.container().call(uiIntro(context));
-               }
+           var about = content.append('div').attr('class', 'map-footer');
+           about.append('div').attr('class', 'api-status').call(uiStatus(context));
+           var footer = about.append('div').attr('class', 'map-footer-bar fillD');
+           footer.append('div').attr('class', 'flash-wrap footer-hide');
+           var footerWrap = footer.append('div').attr('class', 'main-footer-wrap footer-show');
+           footerWrap.append('div').attr('class', 'scale-block').call(uiScale(context));
+           var aboutList = footerWrap.append('div').attr('class', 'info-block').append('ul').attr('class', 'map-footer-list');
+           aboutList.append('li').attr('class', 'user-list').call(uiContributors(context));
+           var apiConnections = context.apiConnections();
 
+           if (apiConnections && apiConnections.length > 1) {
+             aboutList.append('li').attr('class', 'source-switch').call(uiSourceSwitch(context).keys(apiConnections));
+           }
 
-               function pan(d) {
-                   return function() {
-                       if (event.shiftKey) return;
-                       if (context.container().select('.combobox').size()) return;
-                       event.preventDefault();
-                       context.map().pan(d, 100);
-                   };
-               }
+           aboutList.append('li').attr('class', 'issues-info').call(uiIssuesInfo(context));
+           aboutList.append('li').attr('class', 'feature-warning').call(uiFeatureInfo(context));
+           var issueLinks = aboutList.append('li');
+           issueLinks.append('a').attr('target', '_blank').attr('href', 'https://github.com/openstreetmap/iD/issues').call(svgIcon('#iD-icon-bug', 'light')).call(uiTooltip().title(_t.html('report_a_bug')).placement('top'));
+           issueLinks.append('a').attr('target', '_blank').attr('href', 'https://github.com/openstreetmap/iD/blob/develop/CONTRIBUTING.md#translating').call(svgIcon('#iD-icon-translate', 'light')).call(uiTooltip().title(_t.html('help_translate')).placement('top'));
+           aboutList.append('li').attr('class', 'version').call(uiVersion(context));
 
-           }
+           if (!context.embed()) {
+             aboutList.call(uiAccount(context));
+           } // Setup map dimensions and move map to initial center/zoom.
+           // This should happen after .main-content and toolbars exist.
 
 
-           let ui = {};
+           ui.onResize();
+           map.redrawEnable(true);
+           ui.hash = behaviorHash(context);
+           ui.hash();
 
-           let _loadPromise;
-           // renders the iD interface into the container node
-           ui.ensureLoaded = () => {
+           if (!ui.hash.hadHash) {
+             map.centerZoom([0, 0], 2);
+           } // Bind events
 
-               if (_loadPromise) return _loadPromise;
 
-               return _loadPromise = Promise.all([
-                       // must have strings and presets before loading the UI
-                       _mainLocalizer.ensureLoaded(),
-                       _mainPresetIndex.ensureLoaded()
-                   ])
-                   .then(() => {
-                       if (!context.container().empty()) render(context.container());
-                   })
-                   .catch(err => console.error(err));  // eslint-disable-line
+           window.onbeforeunload = function () {
+             return context.save();
            };
 
+           window.onunload = function () {
+             context.history().unlock();
+           };
 
-           // `ui.restart()` will destroy and rebuild the entire iD interface,
-           // for example to switch the locale while iD is running.
-           ui.restart = function() {
-               context.keybinding().clear();
-
-               _loadPromise = null;
+           select(window).on('resize.editor', function () {
+             ui.onResize();
+           });
+           var panPixels = 80;
+           context.keybinding().on('⌫', function (d3_event) {
+             d3_event.preventDefault();
+           }).on([_t('sidebar.key'), '`', '²', '@'], ui.sidebar.toggle) // #5663, #6864 - common QWERTY, AZERTY
+           .on('←', pan([panPixels, 0])).on('↑', pan([0, panPixels])).on('→', pan([-panPixels, 0])).on('↓', pan([0, -panPixels])).on(uiCmd('⌥←'), pan([map.dimensions()[0], 0])).on(uiCmd('⌥↑'), pan([0, map.dimensions()[1]])).on(uiCmd('⌥→'), pan([-map.dimensions()[0], 0])).on(uiCmd('⌥↓'), pan([0, -map.dimensions()[1]])).on(uiCmd('⌘' + _t('background.key')), function quickSwitch(d3_event) {
+             if (d3_event) {
+               d3_event.stopImmediatePropagation();
+               d3_event.preventDefault();
+             }
+
+             var previousBackground = context.background().findSource(corePreferences('background-last-used-toggle'));
+
+             if (previousBackground) {
+               var currentBackground = context.background().baseLayerSource();
+               corePreferences('background-last-used-toggle', currentBackground.id);
+               corePreferences('background-last-used', previousBackground.id);
+               context.background().baseLayerSource(previousBackground);
+             }
+           }).on(_t('area_fill.wireframe.key'), function toggleWireframe(d3_event) {
+             d3_event.preventDefault();
+             d3_event.stopPropagation();
+             context.map().toggleWireframe();
+           }).on(uiCmd('⌥' + _t('area_fill.wireframe.key')), function toggleOsmData(d3_event) {
+             d3_event.preventDefault();
+             d3_event.stopPropagation(); // Don't allow layer changes while drawing - #6584
+
+             var mode = context.mode();
+             if (mode && /^draw/.test(mode.id)) return;
+             var layer = context.layers().layer('osm');
+
+             if (layer) {
+               layer.enabled(!layer.enabled());
+
+               if (!layer.enabled()) {
+                 context.enter(modeBrowse(context));
+               }
+             }
+           }).on(_t('map_data.highlight_edits.key'), function toggleHighlightEdited(d3_event) {
+             d3_event.preventDefault();
+             context.map().toggleHighlightEdited();
+           });
+           context.on('enter.editor', function (entered) {
+             container.classed('mode-' + entered.id, true);
+           }).on('exit.editor', function (exited) {
+             container.classed('mode-' + exited.id, false);
+           });
+           context.enter(modeBrowse(context));
 
-               context.container().selectAll('*').remove();
+           if (!_initCounter++) {
+             if (!ui.hash.startWalkthrough) {
+               context.container().call(uiSplash(context)).call(uiRestore(context));
+             }
 
-               ui.ensureLoaded();
-           };
+             context.container().call(ui.shortcuts);
+           }
 
-           ui.lastPointerType = function() {
-               return _lastPointerType;
-           };
+           var osm = context.connection();
+           var auth = uiLoading(context).message(_t.html('loading_auth')).blocking(true);
 
-           ui.flash = uiFlash(context);
+           if (osm && auth) {
+             osm.on('authLoading.ui', function () {
+               context.container().call(auth);
+             }).on('authDone.ui', function () {
+               auth.close();
+             });
+           }
 
-           ui.sidebar = uiSidebar(context);
+           _initCounter++;
 
-           ui.photoviewer = uiPhotoviewer(context);
+           if (ui.hash.startWalkthrough) {
+             ui.hash.startWalkthrough = false;
+             context.container().call(uiIntro(context));
+           }
 
-           ui.onResize = function(withPan) {
-               var map = context.map();
+           function pan(d) {
+             return function (d3_event) {
+               if (d3_event.shiftKey) return;
+               if (context.container().select('.combobox').size()) return;
+               d3_event.preventDefault();
+               context.map().pan(d, 100);
+             };
+           }
+         }
 
-               // Recalc dimensions of map and sidebar.. (`true` = force recalc)
-               // This will call `getBoundingClientRect` and trigger reflow,
-               //  but the values will be cached for later use.
-               var mapDimensions = utilGetDimensions(context.container().select('.main-content'), true);
-               utilGetDimensions(context.container().select('.sidebar'), true);
+         var ui = {};
 
-               if (withPan !== undefined) {
-                   map.redrawEnable(false);
-                   map.pan(withPan);
-                   map.redrawEnable(true);
-               }
-               map.dimensions(mapDimensions);
+         var _loadPromise; // renders the iD interface into the container node
 
-               ui.photoviewer.onMapResize();
 
-               // check if header or footer have overflowed
-               ui.checkOverflow('.top-toolbar');
-               ui.checkOverflow('.map-footer-bar');
+         ui.ensureLoaded = function () {
+           if (_loadPromise) return _loadPromise;
+           return _loadPromise = Promise.all([// must have strings and presets before loading the UI
+           _mainLocalizer.ensureLoaded(), _mainPresetIndex.ensureLoaded()]).then(function () {
+             if (!context.container().empty()) render(context.container());
+           })["catch"](function (err) {
+             return console.error(err);
+           }); // eslint-disable-line
+         }; // `ui.restart()` will destroy and rebuild the entire iD interface,
+         // for example to switch the locale while iD is running.
 
-               // Use outdated code so it works on Explorer
-               var resizeWindowEvent = document.createEvent('Event');
 
-               resizeWindowEvent.initEvent('resizeWindow', true, true);
+         ui.restart = function () {
+           context.keybinding().clear();
+           _loadPromise = null;
+           context.container().selectAll('*').remove();
+           ui.ensureLoaded();
+         };
 
-               document.dispatchEvent(resizeWindowEvent);
-           };
+         ui.lastPointerType = function () {
+           return _lastPointerType;
+         };
 
+         ui.svgDefs = svgDefs(context);
+         ui.flash = uiFlash(context);
+         ui.sidebar = uiSidebar(context);
+         ui.photoviewer = uiPhotoviewer(context);
+         ui.shortcuts = uiShortcuts(context);
 
-           // Call checkOverflow when resizing or whenever the contents change.
-           ui.checkOverflow = function(selector, reset) {
-               if (reset) {
-                   delete _needWidth[selector];
-               }
+         ui.onResize = function (withPan) {
+           var map = context.map(); // Recalc dimensions of map and sidebar.. (`true` = force recalc)
+           // This will call `getBoundingClientRect` and trigger reflow,
+           //  but the values will be cached for later use.
 
-               var element = select(selector);
-               var scrollWidth = element.property('scrollWidth');
-               var clientWidth = element.property('clientWidth');
-               var needed = _needWidth[selector] || scrollWidth;
+           var mapDimensions = utilGetDimensions(context.container().select('.main-content'), true);
+           utilGetDimensions(context.container().select('.sidebar'), true);
 
-               if (scrollWidth > clientWidth) {    // overflow happening
-                   element.classed('narrow', true);
-                   if (!_needWidth[selector]) {
-                       _needWidth[selector] = scrollWidth;
-                   }
+           if (withPan !== undefined) {
+             map.redrawEnable(false);
+             map.pan(withPan);
+             map.redrawEnable(true);
+           }
 
-               } else if (scrollWidth >= needed) {
-                   element.classed('narrow', false);
-               }
-           };
+           map.dimensions(mapDimensions);
+           ui.photoviewer.onMapResize(); // check if header or footer have overflowed
 
-           ui.togglePanes = function(showPane) {
-               var shownPanes = context.container().selectAll('.map-pane.shown');
+           ui.checkOverflow('.top-toolbar');
+           ui.checkOverflow('.map-footer-bar'); // Use outdated code so it works on Explorer
 
-               var side = _mainLocalizer.textDirection() === 'ltr' ? 'right' : 'left';
+           var resizeWindowEvent = document.createEvent('Event');
+           resizeWindowEvent.initEvent('resizeWindow', true, true);
+           document.dispatchEvent(resizeWindowEvent);
+         }; // Call checkOverflow when resizing or whenever the contents change.
 
-               shownPanes
-                   .classed('shown', false);
 
-               context.container().selectAll('.map-pane-control button')
-                   .classed('active', false);
+         ui.checkOverflow = function (selector, reset) {
+           if (reset) {
+             delete _needWidth[selector];
+           }
 
-               if (showPane) {
-                   shownPanes
-                       .style('display', 'none')
-                       .style(side, '-500px');
+           var selection = context.container().select(selector);
+           if (selection.empty()) return;
+           var scrollWidth = selection.property('scrollWidth');
+           var clientWidth = selection.property('clientWidth');
+           var needed = _needWidth[selector] || scrollWidth;
 
-                   context.container().selectAll('.' + showPane.attr('pane') + '-control button')
-                       .classed('active', true);
+           if (scrollWidth > clientWidth) {
+             // overflow happening
+             selection.classed('narrow', true);
 
-                   showPane
-                       .classed('shown', true)
-                       .style('display', 'block');
-                   if (shownPanes.empty()) {
-                       showPane
-                           .style('display', 'block')
-                           .style(side, '-500px')
-                           .transition()
-                           .duration(200)
-                           .style(side, '0px');
-                   } else {
-                       showPane
-                           .style(side, '0px');
-                   }
-               } else {
-                   shownPanes
-                       .style('display', 'block')
-                       .style(side, '0px')
-                       .transition()
-                       .duration(200)
-                       .style(side, '-500px')
-                       .on('end', function() {
-                           select(this).style('display', 'none');
-                       });
-               }
-           };
+             if (!_needWidth[selector]) {
+               _needWidth[selector] = scrollWidth;
+             }
+           } else if (scrollWidth >= needed) {
+             selection.classed('narrow', false);
+           }
+         };
 
+         ui.togglePanes = function (showPane) {
+           var hidePanes = context.container().selectAll('.map-pane.shown');
+           var side = _mainLocalizer.textDirection() === 'ltr' ? 'right' : 'left';
+           hidePanes.classed('shown', false).classed('hide', true);
+           context.container().selectAll('.map-pane-control button').classed('active', false);
 
-           var _editMenu = uiEditMenu(context);
+           if (showPane) {
+             hidePanes.classed('shown', false).classed('hide', true).style(side, '-500px');
+             context.container().selectAll('.' + showPane.attr('pane') + '-control button').classed('active', true);
+             showPane.classed('shown', true).classed('hide', false);
 
-           ui.editMenu = function() {
-               return _editMenu;
-           };
+             if (hidePanes.empty()) {
+               showPane.style(side, '-500px').transition().duration(200).style(side, '0px');
+             } else {
+               showPane.style(side, '0px');
+             }
+           } else {
+             hidePanes.classed('shown', true).classed('hide', false).style(side, '0px').transition().duration(200).style(side, '-500px').on('end', function () {
+               select(this).classed('shown', false).classed('hide', true);
+             });
+           }
+         };
 
-           ui.showEditMenu = function(anchorPoint, triggerType, operations) {
+         var _editMenu = uiEditMenu(context);
 
-               // remove any displayed menu
-               ui.closeEditMenu();
+         ui.editMenu = function () {
+           return _editMenu;
+         };
 
-               if (!operations && context.mode().operations) operations = context.mode().operations();
-               if (!operations || !operations.length) return;
+         ui.showEditMenu = function (anchorPoint, triggerType, operations) {
+           // remove any displayed menu
+           ui.closeEditMenu();
+           if (!operations && context.mode().operations) operations = context.mode().operations();
+           if (!operations || !operations.length) return; // disable menu if in wide selection, for example
 
-               // disable menu if in wide selection, for example
-               if (!context.map().editableDataEnabled()) return;
+           if (!context.map().editableDataEnabled()) return;
+           var surfaceNode = context.surface().node();
 
-               var surfaceNode = context.surface().node();
-               if (surfaceNode.focus) {   // FF doesn't support it
-                   // focus the surface or else clicking off the menu may not trigger modeBrowse
-                   surfaceNode.focus();
-               }
+           if (surfaceNode.focus) {
+             // FF doesn't support it
+             // focus the surface or else clicking off the menu may not trigger modeBrowse
+             surfaceNode.focus();
+           }
 
-               operations.forEach(function(operation) {
-                   if (operation.point) operation.point(anchorPoint);
-               });
+           operations.forEach(function (operation) {
+             if (operation.point) operation.point(anchorPoint);
+           });
 
-               _editMenu
-                   .anchorLoc(anchorPoint)
-                   .triggerType(triggerType)
-                   .operations(operations);
+           _editMenu.anchorLoc(anchorPoint).triggerType(triggerType).operations(operations); // render the menu
 
-               // render the menu
-               context.map().supersurface.call(_editMenu);
-           };
 
-           ui.closeEditMenu = function() {
-               // remove any existing menu no matter how it was added
-               context.map().supersurface
-                   .select('.edit-menu').remove();
-           };
+           context.map().supersurface.call(_editMenu);
+         };
 
+         ui.closeEditMenu = function () {
+           // remove any existing menu no matter how it was added
+           context.map().supersurface.select('.edit-menu').remove();
+         };
 
-           var _saveLoading = select(null);
+         var _saveLoading = select(null);
 
-           context.uploader()
-               .on('saveStarted.ui', function() {
-                   _saveLoading = uiLoading(context)
-                       .message(_t('save.uploading'))
-                       .blocking(true);
-                   context.container().call(_saveLoading);  // block input during upload
-               })
-               .on('saveEnded.ui', function() {
-                   _saveLoading.close();
-                   _saveLoading = select(null);
-               });
+         context.uploader().on('saveStarted.ui', function () {
+           _saveLoading = uiLoading(context).message(_t.html('save.uploading')).blocking(true);
+           context.container().call(_saveLoading); // block input during upload
+         }).on('saveEnded.ui', function () {
+           _saveLoading.close();
 
-           return ui;
+           _saveLoading = select(null);
+         });
+         return ui;
        }
 
        function coreContext() {
-         const dispatch$1 = dispatch('enter', 'exit', 'change');
-         let context = utilRebind({}, dispatch$1, 'on');
-         let _deferred = new Set();
+         var _this = this;
 
-         context.version = '2.18.1';
-         context.privacyVersion = '20200407';
-
-         // iD will alter the hash so cache the parameters intended to setup the session
-         context.initialHashParams = window.location.hash ? utilStringQs(window.location.hash) : {};
+         var dispatch$1 = dispatch('enter', 'exit', 'change');
+         var context = utilRebind({}, dispatch$1, 'on');
 
-         context.isFirstSession = !corePreferences('sawSplash') && !corePreferences('sawPrivacyVersion');
+         var _deferred = new Set();
 
+         context.version = '2.19.3';
+         context.privacyVersion = '20200407'; // iD will alter the hash so cache the parameters intended to setup the session
 
+         context.initialHashParams = window.location.hash ? utilStringQs(window.location.hash) : {};
+         context.isFirstSession = !corePreferences('sawSplash') && !corePreferences('sawPrivacyVersion');
          /* Changeset */
          // An osmChangeset object. Not loaded until needed.
+
          context.changeset = null;
+         var _defaultChangesetComment = context.initialHashParams.comment;
+         var _defaultChangesetSource = context.initialHashParams.source;
+         var _defaultChangesetHashtags = context.initialHashParams.hashtags;
 
-         let _defaultChangesetComment = context.initialHashParams.comment;
-         let _defaultChangesetSource = context.initialHashParams.source;
-         let _defaultChangesetHashtags = context.initialHashParams.hashtags;
-         context.defaultChangesetComment = function(val) {
+         context.defaultChangesetComment = function (val) {
            if (!arguments.length) return _defaultChangesetComment;
            _defaultChangesetComment = val;
            return context;
          };
-         context.defaultChangesetSource = function(val) {
+
+         context.defaultChangesetSource = function (val) {
            if (!arguments.length) return _defaultChangesetSource;
            _defaultChangesetSource = val;
            return context;
          };
-         context.defaultChangesetHashtags = function(val) {
+
+         context.defaultChangesetHashtags = function (val) {
            if (!arguments.length) return _defaultChangesetHashtags;
            _defaultChangesetHashtags = val;
            return context;
          };
-
          /* Document title */
-         /* (typically shown as the label for the browser window/tab) */
 
+         /* (typically shown as the label for the browser window/tab) */
          // If true, iD will update the title based on what the user is doing
-         let _setsDocumentTitle = true;
-         context.setsDocumentTitle = function(val) {
+
+
+         var _setsDocumentTitle = true;
+
+         context.setsDocumentTitle = function (val) {
            if (!arguments.length) return _setsDocumentTitle;
            _setsDocumentTitle = val;
            return context;
-         };
-         // The part of the title that is always the same
-         let _documentTitleBase = document.title;
-         context.documentTitleBase = function(val) {
+         }; // The part of the title that is always the same
+
+
+         var _documentTitleBase = document.title;
+
+         context.documentTitleBase = function (val) {
            if (!arguments.length) return _documentTitleBase;
            _documentTitleBase = val;
            return context;
          };
+         /* User interface and keybinding */
 
 
-         /* User interface and keybinding */
-         let _ui;
-         context.ui = () => _ui;
-         context.lastPointerType = () => _ui.lastPointerType();
+         var _ui;
 
-         let _keybinding = utilKeybinding('context');
-         context.keybinding = () => _keybinding;
-         select(document).call(_keybinding);
+         context.ui = function () {
+           return _ui;
+         };
 
+         context.lastPointerType = function () {
+           return _ui.lastPointerType();
+         };
+
+         var _keybinding = utilKeybinding('context');
+
+         context.keybinding = function () {
+           return _keybinding;
+         };
 
+         select(document).call(_keybinding);
          /* Straight accessors. Avoid using these if you can. */
-         let _connection;
-         let _history;
-         let _validator;
-         let _uploader;
-         context.connection = () => _connection;
-         context.history = () => _history;
-         context.validator = () => _validator;
-         context.uploader = () => _uploader;
+         // Instantiate the connection here because it doesn't require passing in
+         // `context` and it's needed for pre-init calls like `preauth`
+
+         var _connection = services.osm;
+
+         var _history;
+
+         var _validator;
+
+         var _uploader;
+
+         context.connection = function () {
+           return _connection;
+         };
+
+         context.history = function () {
+           return _history;
+         };
+
+         context.validator = function () {
+           return _validator;
+         };
 
+         context.uploader = function () {
+           return _uploader;
+         };
          /* Connection */
-         context.preauth = (options) => {
+
+
+         context.preauth = function (options) {
            if (_connection) {
-             _connection.switch(options);
+             _connection["switch"](options);
            }
+
            return context;
          };
-
          /* connection options for source switcher (optional) */
-         let _apiConnections;
-         context.apiConnections = function(val) {
+
+
+         var _apiConnections;
+
+         context.apiConnections = function (val) {
            if (!arguments.length) return _apiConnections;
            _apiConnections = val;
            return context;
-         };
+         }; // A string or array or locale codes to prefer over the browser's settings
 
 
-         // A string or array or locale codes to prefer over the browser's settings
-         context.locale = function(locale) {
+         context.locale = function (locale) {
            if (!arguments.length) return _mainLocalizer.localeCode();
            _mainLocalizer.preferredLocaleCodes(locale);
            return context;
          };
 
-
          function afterLoad(cid, callback) {
-           return (err, result) => {
+           return function (err, result) {
              if (err) {
                // 400 Bad Request, 401 Unauthorized, 403 Forbidden..
                if (err.status === 400 || err.status === 401 || err.status === 403) {
                    _connection.logout();
                  }
                }
+
                if (typeof callback === 'function') {
                  callback(err);
                }
-               return;
 
+               return;
              } else if (_connection && _connection.getConnectionId() !== cid) {
                if (typeof callback === 'function') {
-                 callback({ message: 'Connection Switched', status: -1 });
+                 callback({
+                   message: 'Connection Switched',
+                   status: -1
+                 });
                }
-               return;
 
+               return;
              } else {
                _history.merge(result.data, result.extent);
+
                if (typeof callback === 'function') {
                  callback(err, result);
                }
+
                return;
              }
            };
          }
 
+         context.loadTiles = function (projection, callback) {
+           var handle = window.requestIdleCallback(function () {
+             _deferred["delete"](handle);
 
-         context.loadTiles = (projection, callback) => {
-           const handle = window.requestIdleCallback(() => {
-             _deferred.delete(handle);
              if (_connection && context.editableDataEnabled()) {
-               const cid = _connection.getConnectionId();
+               var cid = _connection.getConnectionId();
+
                _connection.loadTiles(projection, afterLoad(cid, callback));
              }
            });
+
            _deferred.add(handle);
          };
 
-         context.loadTileAtLoc = (loc, callback) => {
-           const handle = window.requestIdleCallback(() => {
-             _deferred.delete(handle);
+         context.loadTileAtLoc = function (loc, callback) {
+           var handle = window.requestIdleCallback(function () {
+             _deferred["delete"](handle);
+
              if (_connection && context.editableDataEnabled()) {
-               const cid = _connection.getConnectionId();
+               var cid = _connection.getConnectionId();
+
                _connection.loadTileAtLoc(loc, afterLoad(cid, callback));
              }
            });
+
            _deferred.add(handle);
          };
 
-         context.loadEntity = (entityID, callback) => {
+         context.loadEntity = function (entityID, callback) {
            if (_connection) {
-             const cid = _connection.getConnectionId();
+             var cid = _connection.getConnectionId();
+
              _connection.loadEntity(entityID, afterLoad(cid, callback));
            }
          };
 
-         context.zoomToEntity = (entityID, zoomTo) => {
+         context.zoomToEntity = function (entityID, zoomTo) {
            if (zoomTo !== false) {
-             context.loadEntity(entityID, (err, result) => {
+             context.loadEntity(entityID, function (err, result) {
                if (err) return;
-               const entity = result.data.find(e => e.id === entityID);
+               var entity = result.data.find(function (e) {
+                 return e.id === entityID;
+               });
+
                if (entity) {
                  _map.zoomTo(entity);
                }
              });
            }
 
-           _map.on('drawn.zoomToEntity', () => {
+           _map.on('drawn.zoomToEntity', function () {
              if (!context.hasEntity(entityID)) return;
+
              _map.on('drawn.zoomToEntity', null);
+
              context.on('enter.zoomToEntity', null);
              context.enter(modeSelect(context, [entityID]));
            });
 
-           context.on('enter.zoomToEntity', () => {
+           context.on('enter.zoomToEntity', function () {
              if (_mode.id !== 'browse') {
                _map.on('drawn.zoomToEntity', null);
+
                context.on('enter.zoomToEntity', null);
              }
            });
          };
 
-         let _minEditableZoom = 16;
-         context.minEditableZoom = function(val) {
+         var _minEditableZoom = 16;
+
+         context.minEditableZoom = function (val) {
            if (!arguments.length) return _minEditableZoom;
            _minEditableZoom = val;
+
            if (_connection) {
              _connection.tileZoom(val);
            }
+
            return context;
+         }; // String length limits in Unicode characters, not JavaScript UTF-16 code units
+
+
+         context.maxCharsForTagKey = function () {
+           return 255;
+         };
+
+         context.maxCharsForTagValue = function () {
+           return 255;
          };
 
-         // String length limits in Unicode characters, not JavaScript UTF-16 code units
-         context.maxCharsForTagKey = () => 255;
-         context.maxCharsForTagValue = () => 255;
-         context.maxCharsForRelationRole = () => 255;
+         context.maxCharsForRelationRole = function () {
+           return 255;
+         };
 
          function cleanOsmString(val, maxChars) {
            // be lenient with input
              val = '';
            } else {
              val = val.toString();
-           }
+           } // remove whitespace
+
 
-           // remove whitespace
-           val = val.trim();
+           val = val.trim(); // use the canonical form of the string
 
-           // use the canonical form of the string
-           if (val.normalize) val = val.normalize('NFC');
+           if (val.normalize) val = val.normalize('NFC'); // trim to the number of allowed characters
 
-           // trim to the number of allowed characters
            return utilUnicodeCharsTruncated(val, maxChars);
          }
-         context.cleanTagKey = (val) => cleanOsmString(val, context.maxCharsForTagKey());
-         context.cleanTagValue = (val) => cleanOsmString(val, context.maxCharsForTagValue());
-         context.cleanRelationRole = (val) => cleanOsmString(val, context.maxCharsForRelationRole());
 
+         context.cleanTagKey = function (val) {
+           return cleanOsmString(val, context.maxCharsForTagKey());
+         };
+
+         context.cleanTagValue = function (val) {
+           return cleanOsmString(val, context.maxCharsForTagValue());
+         };
 
+         context.cleanRelationRole = function (val) {
+           return cleanOsmString(val, context.maxCharsForRelationRole());
+         };
          /* History */
-         let _inIntro = false;
-         context.inIntro = function(val) {
+
+
+         var _inIntro = false;
+
+         context.inIntro = function (val) {
            if (!arguments.length) return _inIntro;
            _inIntro = val;
            return context;
-         };
-
-         // Immediately save the user's history to localstorage, if possible
+         }; // Immediately save the user's history to localstorage, if possible
          // This is called someteimes, but also on the `window.onbeforeunload` handler
-         context.save = () => {
+
+
+         context.save = function () {
            // no history save, no message onbeforeunload
            if (_inIntro || context.container().select('.modal').size()) return;
+           var canSave;
 
-           let canSave;
            if (_mode && _mode.id === 'save') {
-             canSave = false;
+             canSave = false; // Attempt to prevent user from creating duplicate changes - see #5200
 
-             // Attempt to prevent user from creating duplicate changes - see #5200
              if (services.osm && services.osm.isChangesetInflight()) {
                _history.clearSaved();
+
                return;
              }
-
            } else {
-             canSave = context.selectedIDs().every(id => {
-               const entity = context.hasEntity(id);
+             canSave = context.selectedIDs().every(function (id) {
+               var entity = context.hasEntity(id);
                return entity && !entity.isDegenerate();
              });
            }
            if (canSave) {
              _history.save();
            }
+
            if (_history.hasChanges()) {
              return _t('save.unsaved_changes');
            }
-         };
-
-         // Debounce save, since it's a synchronous localStorage write,
+         }; // Debounce save, since it's a synchronous localStorage write,
          // and history changes can happen frequently (e.g. when dragging).
+
+
          context.debouncedSave = debounce(context.save, 350);
 
          function withDebouncedSave(fn) {
-           return function() {
-             const result = fn.apply(_history, arguments);
+           return function () {
+             var result = fn.apply(_history, arguments);
              context.debouncedSave();
              return result;
            };
          }
-
-
          /* Graph */
-         context.hasEntity = (id) => _history.graph().hasEntity(id);
-         context.entity = (id) => _history.graph().entity(id);
 
 
+         context.hasEntity = function (id) {
+           return _history.graph().hasEntity(id);
+         };
+
+         context.entity = function (id) {
+           return _history.graph().entity(id);
+         };
          /* Modes */
-         let _mode;
-         context.mode = () => _mode;
-         context.enter = (newMode) => {
+
+
+         var _mode;
+
+         context.mode = function () {
+           return _mode;
+         };
+
+         context.enter = function (newMode) {
            if (_mode) {
              _mode.exit();
-             dispatch$1.call('exit', this, _mode);
+
+             dispatch$1.call('exit', _this, _mode);
            }
 
            _mode = newMode;
+
            _mode.enter();
-           dispatch$1.call('enter', this, _mode);
+
+           dispatch$1.call('enter', _this, _mode);
+         };
+
+         context.selectedIDs = function () {
+           return _mode && _mode.selectedIDs && _mode.selectedIDs() || [];
+         };
+
+         context.activeID = function () {
+           return _mode && _mode.activeID && _mode.activeID();
          };
 
-         context.selectedIDs = () => (_mode && _mode.selectedIDs && _mode.selectedIDs()) || [];
-         context.activeID = () => _mode && _mode.activeID && _mode.activeID();
+         var _selectedNoteID;
 
-         let _selectedNoteID;
-         context.selectedNoteID = function(noteID) {
+         context.selectedNoteID = function (noteID) {
            if (!arguments.length) return _selectedNoteID;
            _selectedNoteID = noteID;
            return context;
-         };
+         }; // NOTE: Don't change the name of this until UI v3 is merged
+
+
+         var _selectedErrorID;
 
-         // NOTE: Don't change the name of this until UI v3 is merged
-         let _selectedErrorID;
-         context.selectedErrorID = function(errorID) {
+         context.selectedErrorID = function (errorID) {
            if (!arguments.length) return _selectedErrorID;
            _selectedErrorID = errorID;
            return context;
          };
-
-
          /* Behaviors */
-         context.install = (behavior) => context.surface().call(behavior);
-         context.uninstall = (behavior) => context.surface().call(behavior.off);
 
 
+         context.install = function (behavior) {
+           return context.surface().call(behavior);
+         };
+
+         context.uninstall = function (behavior) {
+           return context.surface().call(behavior.off);
+         };
          /* Copy/Paste */
-         let _copyGraph;
-         context.copyGraph = () => _copyGraph;
 
-         let _copyIDs = [];
-         context.copyIDs = function(val) {
+
+         var _copyGraph;
+
+         context.copyGraph = function () {
+           return _copyGraph;
+         };
+
+         var _copyIDs = [];
+
+         context.copyIDs = function (val) {
            if (!arguments.length) return _copyIDs;
            _copyIDs = val;
            _copyGraph = _history.graph();
            return context;
          };
 
-         let _copyLonLat;
-         context.copyLonLat = function(val) {
+         var _copyLonLat;
+
+         context.copyLonLat = function (val) {
            if (!arguments.length) return _copyLonLat;
            _copyLonLat = val;
            return context;
          };
-
-
          /* Background */
-         let _background;
-         context.background = () => _background;
 
 
+         var _background;
+
+         context.background = function () {
+           return _background;
+         };
          /* Features */
-         let _features;
-         context.features = () => _features;
-         context.hasHiddenConnections = (id) => {
-           const graph = _history.graph();
-           const entity = graph.entity(id);
-           return _features.hasHiddenConnections(entity, graph);
+
+
+         var _features;
+
+         context.features = function () {
+           return _features;
          };
 
+         context.hasHiddenConnections = function (id) {
+           var graph = _history.graph();
 
+           var entity = graph.entity(id);
+           return _features.hasHiddenConnections(entity, graph);
+         };
          /* Photos */
-         let _photos;
-         context.photos = () => _photos;
 
 
+         var _photos;
+
+         context.photos = function () {
+           return _photos;
+         };
          /* Map */
-         let _map;
-         context.map = () => _map;
-         context.layers = () => _map.layers();
-         context.surface = () => _map.surface;
-         context.editableDataEnabled = () => _map.editableDataEnabled();
-         context.surfaceRect = () => _map.surface.node().getBoundingClientRect();
-         context.editable = () => {
+
+
+         var _map;
+
+         context.map = function () {
+           return _map;
+         };
+
+         context.layers = function () {
+           return _map.layers();
+         };
+
+         context.surface = function () {
+           return _map.surface;
+         };
+
+         context.editableDataEnabled = function () {
+           return _map.editableDataEnabled();
+         };
+
+         context.surfaceRect = function () {
+           return _map.surface.node().getBoundingClientRect();
+         };
+
+         context.editable = function () {
            // don't allow editing during save
-           const mode = context.mode();
+           var mode = context.mode();
            if (!mode || mode.id === 'save') return false;
            return _map.editableDataEnabled();
          };
+         /* Debug */
 
 
-         /* Debug */
-         let _debugFlags = {
-           tile: false,        // tile boundaries
-           collision: false,   // label collision bounding boxes
-           imagery: false,     // imagery bounding polygons
-           target: false,      // touch targets
-           downloaded: false   // downloaded data from osm
-         };
-         context.debugFlags = () => _debugFlags;
-         context.getDebug = (flag) => flag && _debugFlags[flag];
-         context.setDebug = function(flag, val) {
+         var _debugFlags = {
+           tile: false,
+           // tile boundaries
+           collision: false,
+           // label collision bounding boxes
+           imagery: false,
+           // imagery bounding polygons
+           target: false,
+           // touch targets
+           downloaded: false // downloaded data from osm
+
+         };
+
+         context.debugFlags = function () {
+           return _debugFlags;
+         };
+
+         context.getDebug = function (flag) {
+           return flag && _debugFlags[flag];
+         };
+
+         context.setDebug = function (flag, val) {
            if (arguments.length === 1) val = true;
            _debugFlags[flag] = val;
            dispatch$1.call('change');
            return context;
          };
+         /* Container */
 
 
-         /* Container */
-         let _container = select(null);
-         context.container = function(val) {
+         var _container = select(null);
+
+         context.container = function (val) {
            if (!arguments.length) return _container;
            _container = val;
+
            _container.classed('ideditor', true);
+
            return context;
          };
-         context.containerNode = function(val) {
+
+         context.containerNode = function (val) {
            if (!arguments.length) return context.container().node();
            context.container(select(val));
            return context;
          };
 
-         let _embed;
-         context.embed = function(val) {
+         var _embed;
+
+         context.embed = function (val) {
            if (!arguments.length) return _embed;
            _embed = val;
            return context;
          };
+         /* Assets */
 
 
-         /* Assets */
-         let _assetPath = '';
-         context.assetPath = function(val) {
+         var _assetPath = '';
+
+         context.assetPath = function (val) {
            if (!arguments.length) return _assetPath;
            _assetPath = val;
            _mainFileFetcher.assetPath(val);
            return context;
          };
 
-         let _assetMap = {};
-         context.assetMap = function(val) {
+         var _assetMap = {};
+
+         context.assetMap = function (val) {
            if (!arguments.length) return _assetMap;
            _assetMap = val;
            _mainFileFetcher.assetMap(val);
            return context;
          };
 
-         context.asset = (val) => {
+         context.asset = function (val) {
            if (/^http(s)?:\/\//i.test(val)) return val;
-           const filename = _assetPath + val;
+           var filename = _assetPath + val;
            return _assetMap[filename] || filename;
          };
 
-         context.imagePath = (val) => context.asset(`img/${val}`);
+         context.imagePath = function (val) {
+           return context.asset("img/".concat(val));
+         };
+         /* reset (aka flush) */
 
 
-         /* reset (aka flush) */
-         context.reset = context.flush = () => {
+         context.reset = context.flush = function () {
            context.debouncedSave.cancel();
-
-           Array.from(_deferred).forEach(handle => {
+           Array.from(_deferred).forEach(function (handle) {
              window.cancelIdleCallback(handle);
-             _deferred.delete(handle);
-           });
 
-           Object.values(services).forEach(service => {
+             _deferred["delete"](handle);
+           });
+           Object.values(services).forEach(function (service) {
              if (service && typeof service.reset === 'function') {
                service.reset(context);
              }
            });
-
            context.changeset = null;
 
            _validator.reset();
+
            _features.reset();
+
            _history.reset();
-           _uploader.reset();
 
-           // don't leave stale state in the inspector
-           context.container().select('.inspector-wrap *').remove();
+           _uploader.reset(); // don't leave stale state in the inspector
+
 
+           context.container().select('.inspector-wrap *').remove();
            return context;
          };
+         /* Projections */
 
 
-         /* Projections */
          context.projection = geoRawMercator();
          context.curtainProjection = geoRawMercator();
-
-
          /* Init */
-         context.init = () => {
 
+         context.init = function () {
            instantiateInternal();
-
            initializeDependents();
-
-           return context;
-
-           // Load variables and properties. No property of `context` should be accessed
+           return context; // Load variables and properties. No property of `context` should be accessed
            // until this is complete since load statuses are indeterminate. The order
            // of instantiation shouldn't matter.
-           function instantiateInternal() {
 
+           function instantiateInternal() {
              _history = coreHistory(context);
              context.graph = _history.graph;
              context.pauseChangeDispatch = _history.pauseChangeDispatch;
              context.overwrite = withDebouncedSave(_history.overwrite);
              context.undo = withDebouncedSave(_history.undo);
              context.redo = withDebouncedSave(_history.redo);
-
              _validator = coreValidator(context);
              _uploader = coreUploader(context);
-
              _background = rendererBackground(context);
              _features = rendererFeatures(context);
              _map = rendererMap(context);
              _photos = rendererPhotos(context);
-
              _ui = uiInit(context);
+           } // Set up objects that might need to access properties of `context`. The order
+           // might matter if dependents make calls to each other. Be wary of async calls.
 
-             _connection = services.osm;
-           }
 
-           // Set up objects that might need to access properties of `context`. The order
-           // might matter if dependents make calls to each other. Be wary of async calls.
            function initializeDependents() {
-
              if (context.initialHashParams.presets) {
                _mainPresetIndex.addablePresetIDs(new Set(context.initialHashParams.presets.split(',')));
              }
 
              if (context.initialHashParams.locale) {
                _mainLocalizer.preferredLocaleCodes(context.initialHashParams.locale);
-             }
+             } // kick off some async work
+
 
-             // kick off some async work
              _mainLocalizer.ensureLoaded();
+
              _background.ensureLoaded();
-             _mainPresetIndex.ensureLoaded();
 
-             Object.values(services).forEach(service => {
+             _mainPresetIndex.ensureLoaded();
+             Object.values(services).forEach(function (service) {
                if (service && typeof service.init === 'function') {
                  service.init();
                }
              });
 
              _map.init();
+
              _validator.init();
+
              _features.init();
-             _photos.init();
 
              if (services.maprules && context.initialHashParams.maprules) {
-               d3_json(context.initialHashParams.maprules)
-                 .then(mapcss => {
-                   services.maprules.init();
-                   mapcss.forEach(mapcssSelector => services.maprules.addRule(mapcssSelector));
-                 })
-                 .catch(() => { /* ignore */ });
-             }
+               d3_json(context.initialHashParams.maprules).then(function (mapcss) {
+                 services.maprules.init();
+                 mapcss.forEach(function (mapcssSelector) {
+                   return services.maprules.addRule(mapcssSelector);
+                 });
+               })["catch"](function () {
+                 /* ignore */
+               });
+             } // if the container isn't available, e.g. when testing, don't load the UI
+
 
-             // if the container isn't available, e.g. when testing, don't load the UI
-             if (!context.container().empty()) _ui.ensureLoaded();
+             if (!context.container().empty()) {
+               _ui.ensureLoaded().then(function () {
+                 _photos.init();
+               });
+             }
            }
          };
 
-
          return context;
        }
 
-       // When `debug = true`, we use `Object.freeze` on immutables in iD.
        // This is only done in testing because of the performance penalty.
-       let debug = false;
-       let d3 = {
-         customEvent: customEvent,
-         dispatch:  dispatch,
-         event:  event,
+
+       var debug = false; // Reexport just what our tests use, see #4379
+       var d3 = {
+         dispatch: dispatch,
          geoMercator: mercator,
          geoProjection: projection,
          polygonArea: d3_polygonArea,
                actionReverse: actionReverse,
                actionRevert: actionRevert,
                actionRotate: actionRotate,
+               actionScale: actionScale,
                actionSplit: actionSplit,
                actionStraightenNodes: actionStraightenNodes,
                actionStraightenWay: actionStraightenWay,
                uiFieldDefaultCheck: uiFieldCheck,
                uiFieldOnewayCheck: uiFieldCheck,
                uiFieldCheck: uiFieldCheck,
+               uiFieldManyCombo: uiFieldCombo,
                uiFieldMultiCombo: uiFieldCombo,
                uiFieldNetworkCombo: uiFieldCombo,
                uiFieldSemiCombo: uiFieldCombo,
                validationUnsquareWay: validationUnsquareWay
        });
 
-       // polyfill requestIdleCallback
-       window.requestIdleCallback = window.requestIdleCallback ||
-           function(cb) {
-               var start = Date.now();
-               return window.requestAnimationFrame(function() {
-                   cb({
-                       didTimeout: false,
-                       timeRemaining: function() {
-                           return Math.max(0, 50 - (Date.now() - start));
-                       }
-                   });
-               });
-           };
+       window.requestIdleCallback = window.requestIdleCallback || function (cb) {
+         var start = Date.now();
+         return window.requestAnimationFrame(function () {
+           cb({
+             didTimeout: false,
+             timeRemaining: function timeRemaining() {
+               return Math.max(0, 50 - (Date.now() - start));
+             }
+           });
+         });
+       };
 
-       window.cancelIdleCallback = window.cancelIdleCallback ||
-           function(id) {
-               window.cancelAnimationFrame(id);
-           };
+       window.cancelIdleCallback = window.cancelIdleCallback || function (id) {
+         window.cancelAnimationFrame(id);
+       };
        window.iD = iD;
 
 }());
-//# sourceMappingURL=iD.js.map